Powder proportioner for preformer and method of producing nuclear fuel tablets

FIELD: process engineering.

SUBSTANCE: invention relates to nuclear fuel powder performers. Proposed device comprises table 2 with multiple compaction female dies 4 arranged at least in line (R1, R2), top and bottom male dies to compact powder in said female dies, powder proportioner, at least one batch funnel and drive to displace proportioner along direction X. Note here that proportioner comprises slide with its housing on top wall 16 comprising appliance for connection with at least one powder feed tube 10 and appliances (19, 23, 119) to distribute powder along axes parallel with said direction X arranged on slide housing walls (18.1, 18.2) perpendicular to said direction X that feature ramp profile in plane parallel to that of displacement. Note here that distance between female dies 2 equals that between bottom sections 25 of distribution appliance teeth while said slide is arranged on table 2 to embrace every female die 4 by every bottom section 25 between two teeth during slide displacement.

EFFECT: uniform distribution of powder, shorter cycle.

29 cl, 9 dwg

 

The technical field to which the invention relates.

The invention relates to a powder dispenser device, as pellets of nuclear fuel, such as MOSS (a mixture of plutonium oxide and uranium oxide) and to a method of manufacturing nuclear fuel tablets with this dispenser.

The level of technology

A method of manufacturing pellets of nuclear fuel includes the steps where

- filled with powder through the dispenser mold or matrix with appropriate tablet form;

- move the dispenser to release the filled molds;

- pressed powder by using the first and second punches that come into the mold;

- extract pills.

The most time-consuming step in the method of manufacturing of tablets is the stage of filling of the matrix. Therefore, to reduce the cycle time of manufacturing of tablets to reduce the time required to fill the matrix.

Known dispenser powders or a slide housing which includes four side walls and top wall, which are connected to supply pipe powder, and the said body is made to move on the table, in which are formed holes constituting the mold for pressing tablets.

However, the use of powder-type MOSS has the disadvantage that include the hydrated with small particle size MOSS. Indeed, the powder type MOSS has poor flow characteristics, i.e. unsatisfactory ability to provide continuous flow. As a consequence, the particles tend to form clusters and tubes of powder, which block the flow of powder, and hence its distribution in the matrix.

In this case, the matrix is uneven distribution of the powder, resulting in the production of tablets, which do not have an estimated weight and/or have a too large variation of the density.

For maximum security maintenance when used in nuclear reactors fuel assemblies of nuclear fuel, which includes tablets, it is necessary to adjust the characteristics of the tablets.

In addition, the adhesion of powder to the walls of the slide causes an increase in the duration of the cycle.

Accordingly, the present invention is to create a powder dispenser, which enables the production of tablets with the same characteristics.

The present invention is a dispenser that allows you to cut the length of the production cycle of nuclear fuel tablets.

Disclosure of inventions

The aforementioned problems are solved by using made to move through the matrix of the powder dispenser is, includes case, which is fed into the powder. Inside are surface angled to the direction of movement of the slide for distribution of the powder along the preferred axis.

In other words, the dispenser in accordance with the present invention includes increased surface displacement in comparison with the known dispensers to increase the reported powder impulse.

The object of the present invention is preferably a powder dispenser, made with the possibility of messages powder reciprocating motion in a plane along a certain direction of movement, comprising a casing, the upper wall of which is a means of connecting with at least one supply pipe powder, connected to the hopper; and means for distributing powder along different axes essentially parallel to the direction of movement, to fill the matrix for pressing tablets. Each matrix is located on a separate axis distribution, and distribution facilities are located on the perpendicular to the direction of movement of the walls of the casing and contain a sawtooth of land located along a plane parallel to the plane of movement.

In a preferred embodiment of the invention, the dispenser includes cf is DSTV distribution, below on the go, and distribution facilities, are higher in the course, in accordance with the direction of movement.

Below during the means of distribution is preferably shifted in the transverse direction relative to the above in the course of distribution facilities to the width of the tooth so that the tooth tip facing to the lower section between two consecutive teeth.

The dispenser in accordance with the present invention preferably includes longitudinal rails funds made interoperable with guide means located in the plane of movement.

This means the direction of the dispenser and guide means located in the plane of movement, can form the carrier, and on each lateral side of the housing directing means may include a longitudinal protrusion is made slidable in fixed relative to the said plane of the longitudinal groove.

Preferably the longitudinal protrusion is oriented toward the housing, and at least one of the projections is removable.

The dispenser in accordance with the present invention preferably connected with the means of travel, is arranged to message him reciprocating motion along the nab is Alenia move by means of two levers, the first ends of which are pivotally connected to each of the side surfaces of the housing respectively, and second ends opposite the first hinge is connected with means of travel. Each of these levers contains the cylinder.

In the described embodiment of the invention the means of distribution are located on the plate configured to move relative to the body.

In a preferred embodiment of the invention, the dispenser includes a tool made with the possibility of the messages mentioned plates oscillatory motion relative to the matrix along the direction of movement. These funds excitation can represent, for example, a vibrator or piezoelectric elements.

These vibrating means can include means for suspension and a rod rigidly connected at one end with a plate, and the other end with means of communication reciprocating motion along the direction of movement.

Means of suspension may include, for example, a spring sandwiched between the core and the shell.

The dispenser may further include a sealing means located between the plates and the wall of the housing, facing each other, for example an elastic ring with an axis essentially coincident with the axis of the lever.

Means of suspension and can also be made in the form of an elastic ring located between facing each other with the plate and the wall of the housing, and form a sealing tool.

The sealing ring may be affixed to the housing and the plate or may be rigidly attached to the housing and to the plate by vulcanization. This ring can be pressed on the first protruding ring of the casing and acting on the second ring plate.

In one embodiment of the invention, the ring located between the two plates made of sheet metal, which leads to the formation of multilayer plates.

Metal sheets can be made holes facing the ring hole, and the holes of the metal sheet with sides less holes of the plate.

For example, a metal sheet in contact with the plate, welded and/or riveted thereto at the ends of the sheet are bent at right angles.

The dispenser preferably has a surface forming a pusher in the form of a protrusion, made with the possibility of sliding on the slip plane and with the possibility of popping pills after their formation.

The present invention also consists of creating a device tableting powder of nuclear fuel containing

- buffet with many located in at least one row of the matrix for extrusion, in sizes according to the point size of the produced tablets;

- upper and lower punches for pressing powder in the matrix;

the dosing of powders;

at least one hopper for feeding powder into the dispenser;

- means for moving the powder dispenser on the table to make a reciprocating motion along the direction of movement;

while the dosing of powders made with the possibility of messages powder impulses travel and includes a slide body which is on the upper panel contains the means of connecting to the at least one connected with funnel tube powder feeder, and means of distribution of the powder along axes parallel to the direction of movement, for the simultaneous filling of multiple matrices powder, with each matrix is located on the axis of the distribution parallel to the direction of movement, and means of distribution of the powder located on the perpendicular to the direction of movement of the vessel wall of the slide and have a sawtooth profile in a plane parallel to the plane of movement; the distance between matrices is equal to the distance between the lower parts of the teeth and the slide placed on the table with the possibility of coverage of each matrix, each lower section between two of the teeth during movement of the slider.

Preferably the number of matrices is perpendicular to the direction of movement.

Site is preferably along the direction of movement one way of distributing the powder are below in the course of the slide, and other means of distribution of the powder are higher than along the slider.

Preferably the means of distribution of powder below in the course of the slide, are moved in the transverse direction relative to the means of distribution of the powder above it along the slider, the width of the tooth so that the tooth tip facing to the lower section between two consecutive teeth.

Preferably the slide and the table are longitudinal rails funds, while directing means of the slide is arranged to interact with the guide means of the table.

Preferably the guides means of the slide is made on the transverse walls of the casing and contain longitudinal ledges and rails tools table contain longitudinal grooves for sliding them in the above tabs.

Preferably at least one of the guide means of the slide is removable.

Preferably the device tableting powder nuclear fuel contains two cylinders with one end of the cylinder pivotally connected to each parallel to the direction of movement of the side walls of the housing of the slide, and the other, opposite end pivotally connected with the means of moving.

Preferably the means of distribution of the powder formed by plates located on the walls of the case is.

Preferably the plate means of distribution of the powder is arranged to move relative to the body of the slider.

Preferably, the dispenser includes means for excitation, made with the possibility of messages mentioned plates oscillatory movements relative to the matrix along the direction of movement.

Preferably, excitation means includes suspension means and a rod rigidly connected at one end with the plate, and the other end of the tool messages reciprocating motion along the direction of movement.

Preferably the suspension means comprise at least one spring sandwiched between the core and the shell.

Preferably, the dispenser includes sealing means located between the plate and the wall of the housing of the slide, facing each other.

Preferably the sealing means is formed by an elastic ring with the axis coinciding with the axis of the rod.

Preferably the means of suspension is made in the form of an elastic ring located between facing each other with the plate and the wall of the housing of the slide with the formation of the sealing means.

Preferably the ring is located between two metal sheets with the formation of the multilayer plate.

Preferably sheet metal, welded and/or prickle the EN to the plate.

Preferably the means of excitation are vibrator or piezoelectric means type.

Preferably, the slider includes a pusher in the form formed on the surface of the slide protrusion is made slidable in the plane of the table and popping pills after pressing.

Preferably the device tableting powder nuclear fuel contains two parallel rows of matrices and matrix each row equidistant from each other, and the matrix of the first row are shifted relative to the matrix of the second row by half the distance between the matrices of the second row.

Preferably the feed tube of the powder takes place in the direction of rows of the matrix.

Preferably the device tableting powder nuclear fuel contains a collection tool the contents of the dispenser after filling matrix, which has at least one hole made in the table and connected by a pipe with the suction means, and this hole is located under the spout when the latter is in the emptying position, and the collection tool is configured to transport the collected powder into the funnel.

Preferably the table is arranged to move along an axis perpendicular to its flat surface.

The number of matrices preferably perpendi Waren the direction of movement.

In a preferred embodiment of the invention the device comprises two series of parallel matrices, and matrix each row equidistant from each other, and the matrix of the first row are shifted relative to the matrix of the second row by half the distance between the matrices of the second row.

For example, each row includes seven matrices.

Means of transportation include at least one supply pipe connecting the funnel with the spout.

The feed tube can pass in the direction of rows of the matrix.

The device in accordance with the present invention may include a means of collecting the contents of the dispenser after filling of the matrix.

The collection tool may have at least one slot in the table and connected by a pipe with the suction means, and this hole is located under the spout when the latter is in the emptying position.

Preferably the device may contain a delivery vehicle to funnel the powder collected by the collection tool.

In a preferred embodiment of the invention, the table can move along an axis perpendicular to its flat surface.

The device also includes guides for the longitudinal projections of the dispenser.

The object of the present invention is also sposobstvovanie tablets nuclear fuel using the above device tabletting, including the placement of the slide on the matrix, the filling of the matrix powder by shaking the means of distribution along the directions corresponding to the location of the matrix, pressing the powder in the matrix, the removal of the slide and removing the tablets.

Preferably during the filling of the matrix powder skulker report reciprocating motion of the sinusoidal motion.

Preferably during the filling of the matrix powder skulker report reciprocating movement along a triangular path.

Preferably during the pressing of the powder each upper punch move with different speed.

Preferably the means of distribution of the report of the oscillatory motion.

Removing the tablets preferably carried out by lowering the matrix and extract pills, popped by using a dispenser.

The method may also include the optional step of emptying spout.

Brief description of drawings

The present invention will be better understood from the following description with reference to the accompanying drawings.

1 schematically shows a device tabletting nuclear fuel;

figure 2 shows the dispenser in accordance with the present invention, the view with a partial section;

figure 3 is a section along the vertical plane A-a in figure 2;

n is 4 - view of the dispenser in partial cross-section on a vertical plane In accordance with Fig 3;

figure 5 is a section along the plane D-D in figure 2;

figure 6 shows the different positions of the dispenser during the manufacture of tablets;

7, 8, 9A and 9B schematically illustrates alternative embodiments of the dispenser in accordance with the present invention.

The implementation of the invention

Figure 1 shows a device tabletting, including table 2, containing at least one matrix 4, in which the hole to be pressed powder; the slider 6, which is a powder dispenser and configured to move above the matrix 4; hopper 8, connected to the slider through the pipe 10 and the tool 12, the movement of the slide 6 along the X-axis, is arranged to message him preferably a reciprocating motion in accordance with the arrows 14 and 15.

The RAM 6 includes a housing that includes a top wall 16, which are connected to pipe 10, and side walls 18.

The device also includes a located between the hopper and the feed pipe 10, the valve 20 to regulate the flow of powder into the slider.

When the valve 20 is opened, contained in the funnel 8, the powder through the tube 10 enters the slider 6, which tool 12 move makes longitudinal reciprocating postupatelnoe movement along the X-axis in accordance with the arrows 14 and 15 and dispenses the powder in the matrix 4. In the described example shows a matrix, however, there may be several.

Figure 2 illustrates in greater detail a slider in accordance with the present invention, comprising essentially rectangular housing 22 with side walls 18 and top wall 16. The side walls include walls 18.1 and 18.2, perpendicular to the X-axis, when this wall is 18.2 front wall located in front of the rear wall 18.1 in the direction indicated by the arrow 14. Wall 18.3 and 18.4, parallel to the axis X, are connected to other ends of the front and rear walls, respectively.

To ensure the extraction of the tablets, the slider 6 is made slidable on the table 2 along the X-axis between the extreme rear position in which the slider does not cover the matrix 4, and the extreme forward position (position D).

Table 2 in this example contains fourteen matrices or molds arranged in first and second rows R1 and R2, essentially parallel to the y-axis.

The rows in the described example are shifted relative to each other so that the matrices are not aligned along axes parallel to the axis X. Thus, when viewed along the arrow 14, the holes of the matrix of the first row are located between the two holes of the matrices of the second row, except for the holes on the left edge of the row R1 and the right edge of the row R2 (figure 2).

Depending on the required expenditure powder is and and sizes of tablets number of matrices or molds may be more or less fourteen.

In accordance with the present invention, the slider 6 includes an inner plate 19 and 23, provided with a means of distribution of the powder along various directions to move the powder and message him pulse in the direction of each matrix by the developed surface of the slide. Thus it is possible to reduce the adhesion of the powder to the walls and its coupling with them. These means are formed by cavities, limited arranged at an angle to the X-axis surfaces 30 and 32.

In the described example, the internal plates are essentially identical geometry, so it will be shown only the description of the plate 19.

Plate 19 contains sawtooth land located along a plane parallel to the plane of the table 2, and teeth contain the vertices 21 are connected to the bottom sections 25.

The end of the ramp section can be more or less rounded.

The plate 19 is located with respect to the table so that the matrix is aligned with the lower sections 25 between the teeth when viewed along the arrow 14.

The lower portions 25 are preferably limited to an arc of a circle to avoid trapping the powder.

Plate 23 preferably has the same dimensions as the plate 19.

Plate 23 facing to the plate 19. The teeth of the plate 23 is preferably moved along the Y axis relative to the teeth of the plate 19. The shift is preferably equal to the width of the memory is A.

In the described example, the profile plate 19 and plate 23 are complementary.

Preferably the plates 19 and 23 are made with the possibility of removal and installation inside the housing. Thus, their replacement does not require replacement of the entire slider. To this end, the upper wall of the housing is also made removable.

Means 19 and 23 distribution can also be performed directly on the inner surfaces of the side walls of the shell.

The body is made, for example, CuZn, and the means of distribution - for example, from a polymer.

The feed pipe 10 opens through the top wall of the housing is essentially between the contours of the plates 19 and 23. In the described example, the powder supply in the crawler is implemented by four feed pipes 10, evenly distributed along the Y-axis perpendicular to the x axis.

Feeding tubes may be several. For example, there may be six pipes communicated with the bottom six sections 25 of the plate 19 or 23, or even twelve pipes communicated with each lower section 25.

In the described example, there are four separate flexible tubes. However, it can be one long feed tube 10 along the Y-axis throughout top surface of the body, providing a continuous supply of powder along the entire sawtooth plot.

The device in accordance with the present invention also includes a longitudinal e.g. the work by means 33, providing precise movement of the slide along the X-axis with respect to the table 2. As shown in figure 5, the means 33 contain performed on the longitudinal slide protrusion 34 that communicates with a longitudinal groove 36, is made in table 2.

Figure 5 shows more detail of the longitudinal protrusion 34 and the groove 36. The longitudinal protrusion 34 is preferably directed to the housing and enters the groove 36 or the guide located between the protrusion 34 and the wall 18.3, 18.4 of the housing. As shown in figure 2, to install the slide on the table at least one longitudinal protrusion 34 that is located on any of the walls 18.3, 18.4 of the housing is removable.

The groove 36 may be made in the slider, and the protrusion 34 is on the table.

The slider is maintained in contact with the table, in particular matrices, preferably by mechanical means such as a spring. However, there may be used a pneumatic tool, such as a pneumatic drive.

In addition, the supply of powder in the hopper is preferably, for example, by using a suction system with a vacuum pump or a mechanical system containing a vibrating chute and auger.

Through the use of the RAM in accordance with the present invention can limit the delay powder inside of the slide and reduce the risk of formation of clusters of powder. As a consequence, results in an effective filling of the pen the first and second rows of the matrices at elevated costs.

During filling, the crawler performs a reciprocating motion along an axis X in accordance with the arrows 14 and 15. As shown in Fig.6, this movement is carried out, for example, by means of two cylinders 38, one end 39 of each of which is hinged to one of the side walls 18.3, 18.4 of the body of the slide and the other end opposite to the first hinge is connected to the actuator (not shown).

The table preferably is mounted for movement along the vertical axis Z, perpendicular to the directions X and Y. Since both ends of the actuator is pivotally mounted, the slider can be moved together with the table.

The reciprocating motion of the slide preferably is moving in a sinusoidal or triangular laws.

When a sinusoidal law of motion of the slider can be achieved in the powder consumption of about 9 grams per second, and with a triangular law is about 8 grams per second.

The slide also contains a longitudinal end of the ledge 40 to eject the tablets in the direction of the conveyor (not shown) after pressing.

The axis of oscillation and the oscillation amplitude on either side of this axis are determined by the model press. The oscillation axis corresponds to the Central axis between the two rows of matrices and the amplitude ensures the filling of the matrix powder of the slider. Due to edit the tion of the axis of oscillation, i.e. due to its asymmetric position relative to the two rows of the matrix can be adjusted to the possible asymmetry of the filling between the front and near the rear row.

The content of the matrix will be explained in detail with reference to the first row R1, and the filling of the matrices of the second row R2 is symmetric way.

When the plate 19 moves in the direction of arrow 15, the sawtooth profile of this plate 19 distribution provides a collection of powder between each pair of teeth, when this powder is moved along the teeth to the lower sections 25, which are aligned with the matrix 4 of the first row R1 and prior to filling are behind him. At some point in time the lower portions 25 are combined with the matrix 4 row R1, and the powder collected in the lower parts 25 located above the matrix 4 rows R1 and falls into the matrix. The content of the matrix is better, because the powder is applied significant impact impulses from the side plates 19 having a developed surface to move the powder.

The same happens with the second-row R2, when the tool 23 is moving in the direction of arrow 15.

All of the powder required for the manufacture of tablets, drops in each matrix in one pass. This happens for several passes reciprocating movement of the slider. Through such a filling in several stages can p in order to obtain the required uniformity of content.

In addition, the joint reciprocating movement of the slide and the movement of the table provide up the absorption of the powder inside the matrix. Since the lower punch is stationary, the movement of the table up causes an increase in the unfilled volume of the matrix that provides the suction of the powder.

7 to 9 shows an alternative embodiment of the dispenser in accordance with the present invention, which includes the slider 106, which is different from the slide bar 6, shown in Fig.2-6, that means the distribution is made to move relative to the body.

The dispenser depicted in Fig.7, includes plate 119, provided with means for distribution in accordance with the present invention. The plate 119 is connected to the first end 104 of the lever 102, is arranged to move along the X-axis in a reciprocating motion in the direction of arrow 105.

The second end of the lever is connected with a drive (not shown)which has a capability message to the arm movements of small amplitude for imparting means 119 distribution of vibrational motion along the x axis.

Under the action of the lever means of distribution are moving along the X-axis inside the case.

The dispenser also includes means 110 of the suspension, which in this example is formed by two connected in series coil springs 112 are installed with an interference fit between the lever 102 and stationary relative to the housing cover 108.

By means of the suspension powder can report low-frequency oscillations with a large amplitude for its uniform distribution over the entire surface of the slide. These movements can be combined or may be associated with fluctuations of smaller amplitude and/or lower frequency in order to "liquefaction" of powder to a violation of his grip and ensure proper filling of the matrix.

The dispenser also includes a sealing means 114, located between the casing and the means of distribution and prevents the ingress of powder between the walls of the casing and switch plates. This sealing means in the described example is an elastic ring, essentially coaxially with the lever 102.

In the example shown in Fig, the ring 114 forms and sealing means, and means 110 of the suspension, and the ring size is selected so that it performs both of these functions.

In a preferred embodiment of the invention used elastic material withstands temperatures in the range from 50 to 130C., and radiation.

The ring is made, for example, by cutting it from an elastic plate.

This ring is attached to the housing and to the means of distribution, for example, by gluing or vulcanization.

This ring can be pressed onto the protruding part of the body and the funds allocated to the I, for example, the ring having an outer diameter exceeding the inner diameter of the elastic ring.

Tools of the suspension can also be a cut-out ring in the plate of the multi-layered material that includes an elastic layer 116 located between two plates of metal sheets (figa and 9B).

Metal sheets means the suspension can be welded and/or riveted to the housing and the plates 119.

7, 8, 9A and 9B depict only one plate, provided with a means of distribution, but in the present invention can be used two facing each other vibrating plates, as in the dispenser according to figure 2.

Unit excitation can be provided with each plate, or may be a single block of excitation for both plates, which, for example, rigidly connected.

In a preferred embodiment of the invention (figa and 9B) of the metal sheet in contact with the means of distribution, contains elastic layer, superimposed on the back surface of the means of distribution, and the ends 120 of sheet metal bent at right angles to the sides of the means of distribution. Thus, the tool 110 suspension prevents any penetration of the powder between the means of distribution and housing.

In one embodiment of the invention shake powder is the only variation of the means of distribution without making a slider reciprocating motion.

On the one hand, this leads to less stress on the arms, equipped with the previously described cylinder, so you can use them only for movements with large amplitude for installation of the slide in position A-D depicted in Fig.6, and ensure the heat of the RAM to effect the pressing.

On the other hand, is also a reduction in the cycle time of manufacturing tablets, because the impulses directly on the powder.

In addition, since the slider remains above the two rows of the matrix, the filling of the matrices is reduced compared to a system in which the slider makes passes back and forth between matrices that are located above and below the course.

In accordance with the present invention the dispenser allows you to provide shake powder by the reciprocating motion of the slide, and means imparting oscillatory movements of the means of distribution.

In a preferred embodiment of the invention block the excitation is located outside of the slide, which facilitates maintenance and allows you to avoid the risk of failure due to insufficient ventilation.

Preferably the means of distribution, made with the possibility to perform oscillatory movements are as close as possible to Matri who am, to break the adhesion of the powder in those places, which should be removed.

The AC excitation is, for example, electromagnetic excitation device, such as a vibrator, or a block of excitation of the piezoelectric type.

The use of vibrators provides a wide range of frequencies and amplitudes.

Can use blocks of excitation of any suitable type, such as a magnetic type.

As described previously, to ensure stability of the fill matrix device tabletting includes means to control movement of the slide, and regulation unit excitation in accordance with certain cycles. In the beginning of the cycle can be done oscillations with a large amplitude, and then oscillations with smaller amplitude and/or variable frequency.

Next, with reference to the positions a-E of the slide, shown in Fig.6, the described method of manufacturing tablets with the use of a metering device according to the present invention.

In accordance with the present invention a method of manufacturing tablets includes the following steps, which are:

a) have the slider on the matrices (position a), and the slider includes means for distributing powder along different axes;

b) fill the matrix powder by shaking the means of distribution;

C) todat the slider (position);

g) pressed powder;

d) extract tablets (status).

During stage b), the valve 20 is open, providing contained in the powder funnel in the case of the RAM pipes 10.

Further, the housing of the slide makes a reciprocating motion (for example, seven or eight passes back and forth), and/or means of distribution of the report of the vibrational motion, providing uniform distribution of the powder and prevents the adhesion of the powder particles. During filling, you can move the bottom punch, causing a suction effect.

During stage C), the slider does move backward in table 2 with amplitude greater than a reciprocating motion while shaking, to fully disclose the matrix to approach the top of the punch.

During stage d), the powder is pressed between the upper and lower punches for a certain period of time. The speed of movement of the upper punch during the pressing time can be changed.

During stage d) table moves down, causing the ejection of the tablets from the dies, and then the slider is moving forward with a large amplitude to push pills on the conveyor, located at the front end of the table.

The method may further include the step of emptying of the slide, when the latter is in position op is ronania (position D) over holes, connected with the suction means remaining in the slide powder.

After the end of the cycle, the slide is in the initial position expectations (position E).

At positions C-E of the slide table is in the down position.

By means of the slide according to the present invention the time of filling of the matrices can be reduced to a few seconds.

1. The device tableting powder of nuclear fuel containing
table (2) lots located in at least one row (R1, R2) matrix (4) for pressing, the dimensions of which correspond to the dimensions of the manufactured tablets;
the upper and lower punches for pressing powder in the matrix;
the dosing of powders;
at least one hopper for feeding powder into the dispenser;
means for moving the powder dispenser on the table to make a reciprocating motion along the direction (X) move;
while the dosing of powders made with the possibility of messages powder impulses travel and includes a slide body which is on the upper wall (16) includes a means of connecting with at least one connected to the funnel tube (10) powder feeder, and means (19, 23, 119) distribution of the powder along axes parallel to the direction (X) of movement for the simultaneous filling of multiple matrices (4) powder, with each matrix of races is alogena axis distribution, parallel to the direction (X) of movement, and means (19, 23, 119) distribution of the powder located on the perpendicular to the direction (X) of the moving walls (18.1, 18.2) the body of the slide and have a sawtooth profile in a plane parallel to the plane of movement; the distance between the matrices (4) is equal to the distance between the bottom sections (25) of the tooth and the slide placed on the table (2) with the coverage of each matrix (4) each bottom section (25) between two teeth during movement of the slider.

2. The device according to claim 1, in which the number of (R1, R2) of the matrix perpendicular to the direction (X) of movement.

3. The device according to any one of claims 1 or 2, in which along the direction (X) the movement means (19) distribution of the powder are below in the course of the slide, and means (23) distribution of the powder are higher than along the slider.

4. The device according to claim 3, in which means (19) distribution of the powder below in the course of the slide, are moved in the transverse direction relative to the means (23) distribution of the powder above it along the slider, the width of the tooth so that the top (21) of the tooth facing the bottom section (25) between two consecutive teeth.

5. The device according to any one of claims 1 or 2, in which the slider and the table are longitudinal rails funds, while directing means (33) of the slide made with the option of interacting with the guide means of the table.

6. The device according to claim 5, in which the guide means (33) of the slide is made on the transverse walls (18.3, 18.4) and contain longitudinal protrusions (34)and that the guide means of the table contain longitudinal grooves (36) to slip them in the above tabs.

7. The device according to claim 6, in which at least one guide means (34) of the slide is removable.

8. The device according to any one of claims 1 or 2, containing two cylinders (38), with one end of the cylinder pivotally connected to each of the parallel direction (X) of movement of the side walls (18.3, 18.4) the body of the slide, and the other opposite end pivotally connected to means (12) travel (X).

9. The device according to any one of claims 1 or 2 in which the means of distribution of the powder formed by plates located on the inside of the slider.

10. The device according to claim 9, in which the plate means of distribution of the powder is arranged to move relative to the body of the slider.

11. The device according to claim 10, in which the dispenser includes means for excitation, made with the possibility of messages mentioned plates oscillatory movements relative to the matrix (4) along the direction (X) of movement.

12. The device according to claim 11, in which the excitation means include means (110) and suspension rod (102), rigidly connected at one end (104) with the plate and the other end is m - tool messages reciprocating motion along the direction (X) of movement.

13. The device according to item 12, in which means (110) suspension includes at least one spring (112), sandwiched between the core and the shell.

14. The device according to item 12, in which the dispenser includes a sealing means (114)located between the plate and the wall of the housing of the slide, facing each other.

15. The device according to 14, in which the sealing means (114) is formed by an elastic ring with the axis coinciding with the axis of the rod (102).

16. The device according to item 12, in which means (110) of the suspension is made in the form of an elastic ring located between facing each other with the plate (19, 23, 119) and the wall of the housing of the slide with the formation of the sealing means.

17. The device according to clause 16, in which a sealing ring is located between two metal plates (118) with the formation of multilayered plates.

18. The device according to 17, in which the metal plate (118) is welded and/or riveted to the plate(19, 23, 119).

19. The device according to claim 11 in which the means of excitation are vibrator or piezoelectric means type.

20. The device according to any one of claims 1 or 2, wherein the slider includes a pusher in the form formed on the surface of the slide protrusion (40)is made slidable in the plane of the table is popping pills after pressing.

21. The device according to any one of claims 1 or 2, comprising two parallel rows (R1, R2) matrix (4), and matrix (4) each row (R1, R2) equidistant from each other, and the matrix (4) of the first row (R1) are shifted relative to the matrix (4) second row (R2) half the distance between the matrices (4) second row (R2).

22. The device according to any one of claims 1 or 2, in which the pipe (10) powder supply takes place in the direction of rows (R1, R2) matrix (4).

23. The device according to any one of claims 1 or 2, including means for collecting the contents of the dispenser after filling matrix, which has at least one hole made in the table and connected by a pipe with the suction means, and this hole is located under the spout when the latter is in the emptying position, and the collection tool is configured to transport the collected powder into the funnel.

24. The device according to any one of claims 1 or 2, in which the table (2) is arranged to move along an axis (Z)perpendicular to its surface.

25. A method of manufacturing pellets of nuclear fuel through the device tabletting according to any one of claims 1 or 2, including the placement of the slide on the matrix, the filling of the matrix powder by shaking the means of distribution along the directions corresponding to the location of the matrix, pressing the powder into the Mat who izah, the removal of the slide and removing the tablets.

26. The method according A.25, in which during the filling of the matrix powder skulker report reciprocating motion of the sinusoidal motion.

27. The method according A.25, in which during the filling of the matrix powder skulker report reciprocating movement along a triangular path.

28. The method according to any of PP-27, which at the time of pressing of the powder each upper punch move with different speed.

29. The method according to any of PP-27, in which the means of distribution of the report of the oscillatory motion.



 

Same patents:

FIELD: physics, nuclear physics.

SUBSTANCE: invention relates to nuclear energetics and can be used in the manufacture of triple-layered tubular fuel elements with a dispersion type core. Method of manufacturing triple-layered tubular fuel elements involves putting a work piece of the fuel core from uranium dioxide into a cover from an aluminium alloy, calibration, combined hot pressing, thermal processing and, at least one draw process. Uranium dioxide is dispersed in the aluminium matrix. Tempering is used for thermal processing. Tempering includes heating at a temperature of 350-440°C for a period of 5-30 minutes followed by cooling in air. Tempering is carried out before each drawing passage.

EFFECT: increase in the quality of fuel elements, prevention of cracking of the cover and core, gives them elasticity.

3 dwg

FIELD: nuclear power industry.

SUBSTANCE: processing of uranium dioxide UO2 powder or mixture of uranium dioxide UO2 and uranium oxide U3O8 powders makes it possible to prepare press-powder that consists of mixture of uranium dioxide UO2 powder up to 85% and uranium oxide U3O8 powder of up to 15%, without increase of volume fraction of open pores of more than 1%, and also makes it possible to prepare pressed pellets with density of up to 6 g/cm3 at pressing pressures of up to 4500 kgf/cm2 without generation of cracks and with even shrinkage during sintering, which makes it possible to reduce wastes during polishing of pellets.

EFFECT: increase of specific efficiency of pellet sintering lines.

4 dwg

FIELD: atomic industry; producing pelletized fuel from uranium dioxide for nuclear reactor fuel elements.

SUBSTANCE: proposed method includes mixing of uranium dioxide powder with plasticizer, compaction of pellets from charge obtained, their sintering, grinding, and drying. Uranium dioxide is obtained by hexafluoride pyrolysis; fusible polymeric compounds are used as plasticizer. Charge obtained upon mixing uranium dioxide with plasticizer is heated to plasticizer melting temperature. Polyethylene glycol is used as plasticizer in amount of up to 3 mass percent.

EFFECT: reduced power requirement, enhanced nuclear and radiation safety, enhanced productivity and yield of fuel pellets.

1 cl, 1 tbl

FIELD: nuclear engineering; manufacture of nuclear fuel pellets for charging fuel elements of nuclear reactors.

SUBSTANCE: each trough is filled with pellets in bulk to 85% of its volume and drying is made in three zones under different temperature conditions. Troughs are displaced at linear speed of maximum 0.04 m/s. Gaseous nitrogen is heated and supplied to drying zones under pressure, drying is effected until hydrogen content of pellets becomes not over 6 x 10-5%. Pellet drying device is provided in addition with heater and control system. Drying unit is produced from retort in the form of square-section horizontal pipe enclosed by heating wires and thermal converters. Charge-discharge units at retort ends have doors set in motion by means of pneumatic cylinders. Conveying facility is, essentially, conveyer with levers, heater is heated pipe feeding hot gaseous nitrogen to retort, and control system is built around programmable controller.

EFFECT: enhanced quality and operating reliability of pellets, enhanced capacity of pellet drying device.

3 cl, 3 dwg

FIELD: nuclear power industry; production of sintered pellets from ceramic materials for nuclear fuel including uranium dioxide ones to charge nuclear reactor fuel elements.

SUBSTANCE: proposed computerized bay for manufacturing nuclear fuel pellets has following pieces of equipment: evaporation cell, hydrolyzate, extractor/re-extractor cascade, three-cascade settling reactor, filtering installation, screw feeder, drying-and-calcining kiln, storage bin with screw feeder, reduction furnace, screw refrigerator, mixer, automatic press, sintering furnace, centerless grinder, drying installation, installation for controlling pellets, waste solution tank, process variable point meters, and control boards for respective pieces of equipment. Each piece of equipment is provided with process variable meters and actuating mechanisms interconnected with control boards to organize process control system incorporating process sensor and additional mechanism unit, logic programming unit, and operating station unit. Process sensor and additional mechanism unit is modular design built according to its functions and types of variables under measurement and has module of level, temperature, flow, pressure, and concentration sensors, mentioned variables regulation module, display module, as well as equipment and actuating mechanisms control module. Logic programming unit has central and switching processors, interface module, and input/output modules. Operating station unit has system unit monitors, switching processors, and keyboard; uranium solution tanks are provided, in addition, with their geometric size meters and their input/output pipes are provided, in addition, with uranium solution concentration meters.

EFFECT: optimized conditions and ability of on-line process control.

1 cl, 2 dwg

FIELD: nuclear power engineering; production of fuel pellets for fuel elements of nuclear reactor fuel assemblies.

SUBSTANCE: proposed line is provided with unit controlling pellets for thermal stability incorporating vertical heaters that have at least three segmented heating elements forming internal cylindrical space to receive molybdenum container. Heat shields are installed outside the heater on its sides and top. Container is made of molybdenum spirally twisted in a number of layers and provided with through side slits holding horizontally mounted tungsten rods with limiting ring outside the container. Rods installed inside container carry alternately mounted detachable perforated detachable molybdenum disks spaced apart by means of removable rings whose height exceeds that of pellets. Thermal stability control unit communicates with vacuum system and is provided with argon and hydrogen admission pipes and control means; it has water-cooled cover and walls, as well as argon and hydrogen moisture saturator. Pellets arriving for charging fuel elements show enhanced stability of temperature conditions during their temperature control.

EFFECT: enhanced thermal stability of pellets and service life of container.

1 cl, 4 dwg

FIELD: nuclear power engineering; pelletized uranium fuel production for fuel elements of nuclear reactor fuel assemblies.

SUBSTANCE: proposed line is provided with process device designed for removing zinc-containing scab from furnace tunnel of pellet sintering unit and made in the form of elongated rod with scrapers in top and side butt-end parts entered on loading end throughout entire heating zone and supported by draw-out tray, with supporting skids disposed in middle part of device resting on lining of trough carrying vehicle. Other butt-end of device carries longitudinal reciprocation and upward-down motion drive installed beyond furnace area and second process device in the form of elongated rod with scraper whose thickness equals half the distance between side lining of furnace tunnel and trough carrying vehicle, with adjustable-height support in rod center resting on trough carrying vehicle surface and reciprocation drive on other end of rod.

EFFECT: enhanced productivity and service life of furnace.

1 cl, 7 dwg

FIELD: nuclear power engineering.

SUBSTANCE: pelletized fuel is produced for fuel elements of nuclear reactor fuel assemblies from uranium dioxide. Pellets are gradually sintered in tunnel furnace by zones isolated with heat barriers at definite heating and cooling temperatures. In the process pellets of desired density, microstructure, volume fraction of open pores, and tendency of sintered pellets to additional sintering are produced.

EFFECT: enhanced yield.

1 cl, 2 dwg

FIELD: nuclear industry.

SUBSTANCE: pelletized fuel manufacturing units are provided with gas-cleaning system using cyclone with swirler for coarse cleaning that has cylindrical reverse-taper housing expanding toward bottom part joined with large base of taper bin accommodating dust collector.

EFFECT: improved shielding of personnel from internal radiation, reduced loss of radioactive raw materials.

4 cl, 4 dwg

The invention relates to nuclear power and may find application in the manufacture of three-layer tubular fuel elements (Fe) core dispersion type

FIELD: mechanical engineering.

SUBSTANCE: invention refers to part grippers which are designed for press automation. The device contains beam made capable to be moved by actuator for part transportation, gripping facility and coupling unit. The gripping facility is intended for controlled gripping and releasing parts and is made in the form of sucking on spider. The coupling unit contains two half-couplings one of which is connected with the beam and the other - with gripping facility, and mechanical blocking device with manipulator made capable to be actuated by means of relative movement of coupling unit against stopper and unlocking the blocking device. The actuator contains regulating drive for moving sucking on spider in longitudinal direction.

EFFECT: providing automatic change of tooling equipment.

12 cl, 7 dwg

FIELD: conveyor construction industry.

SUBSTANCE: present inventions pertain to forming, and may be used at transportation of blanks in the press or in press line. Conveyor for blanks transportation consists of the first and the second side beams located on both sides of the press. For transported blank gripping there is at least one pillar with gripping devices attached to side beams. The pillar is moved along beams and presents a cross-bar arranged across the press. Side beams are attached to the assemblies that include turning mechanism for beam turning about horizontal axis perpendicular to transportation direction. Gripping devices have the possibility of movement with rotation in order to compensate blank orientation caused by beams turning. During blanks transportation the pillar is arranged above the blank, by side beam turning the pillar is pulled down and the blank is gripped. Then by side beam turning the pillar is lifted and the blank is transported to second zone via pillar's movement along the beam. At blank transportation the side beam is turned about rotation axis and the blank is released from the grip.

EFFECT: provision of conveyor structure simplification and increase of parts transportation efficiency.

16 cl, 13 dwg

FIELD: technological processes.

SUBSTANCE: two platforms move horizontally from furnace to press axis. On each platform double-arm lever with claw at one end is fixed by support. The claw is formed by upper and lower arms with gripping elements mounted at their ends. Second end of each double-arm lever is positioned between fixed stops and connected to a drive. Support of platform located at the press spinneret side can shift parallel to the press axis.

EFFECT: possibility of loading workpieces of various size and form.

6 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: on press bed two eccentric shafts are mounted on both sides in relation to slab feed direction. Axes of shafts are installed perpendicularly to direction of slab feed. Shafts are connected with drive and equipped with eccentric bushings of travel control mechanism. Sliders are installed on bushings with the possibility of relative rotation. Sliders may progressively move perpendicularly to axes of shafts. Two plates with strikers are installed on sliders by means of screws of press closed height control mechanism. Sliders are connected between each other by means of columns with the possibility of forward motion in relation to the latter ones.

EFFECT: increase of press efficiency.

1 dwg

FIELD: plastic working of material, possibly equipment for multiple forming of small parts at automatic supply of strip material.

SUBSTANCE: apparatus for reciprocation motion of slide of drive unit for feeding material includes crank - connecting rod mechanism with connecting rod and crankshaft or cam mechanism with pusher. Such mechanism includes guide onto which roller moves. Said roller is made with possibility of fixed rotation for changing stroke value of slide. Connecting rod or pusher is double-link one; its links are joined through hinge with roller.

EFFECT: enhanced accuracy of slide stroke controlling and of material feeding.

2 dwg

FIELD: powder metallurgy, namely manufacture of sintered elongated blanks of alloy on base of tungsten, possibly production of bodies of armor-piercing shells.

SUBSTANCE: method comprises steps of pouring mixture of metallic powders and(or) alloy powder by batch dozes to container; performing continuous layer by layer sintering of each batch of powder with blank part by induction heating in hydrogen atmosphere till temperature 1700-2000°C; after-pressing each batch and simultaneously forming on blank surface charging recess for next batch. Apparatus includes hopper for powder provided with agitator; adjustable metering device; feeder with gate; movable container for placing powder; concentrators and inductor arranged coaxially to movable container; refrigerator and pulling mechanism. Feeder is in the form cylindrical vessel inside which gate is arranged coaxially to it. Gate and vessel may be moved one relative to other and relative to blank axis at independent motion speeds. Lower ends of gate and vessel are in the form of cones.

EFFECT: possibility for producing blank of any desired length, elimination of non-uniformity of chemical content, uniform microstructure along length of blank.

10 cl, 7 dwg, 1 tbl, 2 ex

FIELD: mechanical engineering; production of the devices for loading of the powder materials into the lower die of the die mold.

SUBSTANCE: the invention is pertaining to the field of mechanical engineering, in particular, to the shape-forming equipment and may be used in the multi-position presses at molding of the ceramic and metallic powder materials. The device contains the loading cassette equipped with the tool for the products unloading from the pressure position. It is supplied with the plate made with the capability of the horizontal reciprocal motion inside the press frame. In the state of the powder material loading the plate forms the common loading plane with the loading table of the die mold for movement of the loading cassette on it. In the state of the product unloading from the pressure position the plate may form a clearance between the loading table and the plate. The clearance exceeds the product dimensions. The tool for the products unloading from the pressure position is made in the form of the small frame installed on the external side of the loading cassette, which dimensions exceed the dimensions of the product. The plate is made the self-installed and fixed in the state of the powder material loading. The technical result of the invention is development of the compact device equipped with the tool for withdrawal of the finished products from the area of the press-molding.

EFFECT: the invention ensures production of the shape-forming compact device equipped with the tool for withdrawal of the finished products from the area of the press-molding and used in the multi-position presses at molding of the ceramic and metallic powder materials.

2 cl, 2 dwg

FIELD: mechanical engineering, particularly pressing equipment adapted to press ceramic and metal powders.

SUBSTANCE: device comprises loading cassette arranged on movable plate connected to hopper through flexible hose and to cam by means of link lever mechanism. The cam is installed on press shaft. Link lever mechanism comprises control rod, carriage, link with roller, strip jointing to gear wheel and driving roller. One control rod end is hingedly connected with loading cassette, another one is attached to carriage. Roller is installed in link groove and is hingeldy connected with carriage. The link is installed on gear wheel shaft jointing to strip. Driving roller is arranged on strip end and may be arranged in slot of cam installed on central press shaft. The control rod is made as length-adjustable lever spring-loaded to carriage by means of spring. The carriage may reciprocate in guiding means installed in press. Teeth mating each other are formed on ends of link and gear wheel hub.

EFFECT: simplified device structure.

3 cl, 1 ex

The invention relates to agricultural machines and can be used to prepare the substrate for growing mushrooms

The invention relates to the field of press-forging equipment, in particular to the supply device power presses

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, particularly, to magnetic-pulse devices intended for compaction of nano-sized powders. Proposed unit consists of power supply comprising pulsed current generator, discharger and control unit, press comprising frame to accommodate flat inductor, electrically conducting plate, springs to send said plate back into initial position after compaction, degassing units, moulds, loading zones, lock, push rods and transfer chambers.

EFFECT: expanded performances of compaction and higher efficiency.

2 dwg, 1 ex

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