Disc granulator

 

(57) Abstract:

The invention relates to the technique of granulation of solid bulk materials in the disc granulators and can be used in food, chemical and other industries. Disc granulator includes a frame and an inclined plate has a cylindrical shape, mounted with possibility of simultaneous rotation and swing about an axis coinciding with the axis of its rotation, which are implemented by the rotational drive and a physical pendulum with the trigger mechanism. Setting the physical parameters of the pendulum coloradoans frequency reduces friction losses, which reduces the amount of energy to swing the plate, and to improve the performance of the granulator. 3 C.p. f-crystals, 2 Il.

The invention relates to a technique of granulation of solid bulk materials in the disc granulators and can be used in food, chemical and other industries.

Known plate granulator comprising an inclined cylindrical plate with sides and bottom, a frame, a motor for rotation of the plate, the upper and lower knives mounted in the plate at an acute angle to its vertical diametrally motion of the granules, and the bottom of the granulator provided with concentric corrugations in the form of removable elements. Granulation occurs by rotation of the material in the plate and rolling the resulting granules on the surface of the material and change trajectories rolling granules curved planes of the upper and lower knives and concentric corrugations.

The proposed construction of a disc granulator can improve performance. [USSR author's certificate N 1819666, IPC 01 J 2/12, 1993].

A disadvantage of the known disc granulator are large expenditure of energy on the rotation of the plate due to the additional friction of the granulated material of the knives and the corrugations and, as a consequence, the increase in specific energy consumption for granulation.

Known disc pelletizer, comprising a housing with a cover, which features a sloping plate, drive plate, loading and unloading spouts, nozzles, separating device, the regulating plate and stop knife regulating plate is installed in the plate and perpendicular to the gap in the 25 - 35 mm relative to the bottom trills, stop the knife is mounted so that the edge of the blade parallel to the bottom of the plate and oriented towards the rotation of the plate, separator Vernoy the bottom of the plate. Granulation occurs by rotation of the material in the plate and rolling the resulting granules on the surface of the material and change trajectories rolling granules regulating plate, stop the knife and rod, of a separating device. The proposed design improves the performance of disk granulator. (RF patent N 2105601, IPC 01 J 2/14, 1996 - prototype).

The disadvantages of the known disc granulator of the prototype are: first, the complexity of the device due to the presence of a separating device, the regulating plate and the stop-knife, which leads to increased consumption of energy to overcome friction of these devices on the granulated material and the increase of metal, secondly, high intensity and large size of the granulator plate.

To simplify design, reduce its size, metal consumption and energy intensity and improve the performance of the proposed plate granulator containing a frame, an inclined plate, a motor for rotation of the plate around its Central axis, the actuator swing the plate, turn the plate around a horizontal axis, loading and unloading spouts, the drive of rotation of the plate with the axis, non-coplanar and orthogonal to the physical pendulum with the trigger mechanism. The trigger mechanism of a physical pendulum can be made in the form of a Cam mechanism with roller plunger mounted on the frame, or the trigger may be in the form of an electromagnetic pulse of the pusher. The depth of the cylindrical granulator plate is 1/3 of its internal diameter.

A distinctive feature of the proposed device disc granulator is the presence of actuator rotation of the plate with the axis, non-coplanar and orthogonal to the axis of rotation of the plate, and drive the swing plate in the form of a physical pendulum with a trigger mechanism that ensures the coincidence of the axis of swing with the axis of rotation.

The choice of the optimal relationship of the height of the Board H granulator plate to its diameter D is produced under condition of providing the minimum area of the working surface of the granulator plate in contact with the loading plate at a given capacity of the pellet mill and constant density of the material load, and a constant rotational speed of the granulator plate. Performance In the granulator under these conditions is proportional to the power N, the transmitted load plates, and is equal to:

B=N/c,

where c is the consumption of energy is Areli to which it mixes

N=AR2,5HpS0,

where A is a constant, R is the radius of the plate, p is the bulk density of the mixture, S - factor of the transmitted power.

Area F of contact between the working surface of the granulator plate loaded in the plate with a mixture of

F = R2+2RH.

Find such values of R and H, in which the working area F the inner surface of the plate reaches its minimum when the following limitation:

R2,5H=C-const.

Solutions are found using the method of Lagrange, which form the Lagrange function

F = R2+2RH-(R2,5H-C)

where is the Lagrange multiplier.

Taking partial derivatives of the Lagrangian function f/R; f/n; f/ and equating them to zero, a system of equation

< / BR>
< / BR>
< / BR>
Solving this system with respect to R and H, from the second equation get

< / BR>
Substituting the value of R in the first equation, have

< / BR>
Given that D=2R and dividing H by D, receive

< / BR>
So, get a simple proof of the optimality of the ratio of the length of the granulator plate to its diameter based on at least the working surface of the plate.

In Fig. 1 shows a frontal projection of the proposed disc granulator of Fig. 2 - side projection Terelj who ate 2 to drive the rotation of the plate 3, fixed bracket 4 on the rotary axis 5, which by means of cores 6 fortified counterweight 7, the rotary shaft is supported by bearings 8, on the bottom of the plate strengthened the Cam mechanism of the shutter 9, which engages with a roller follower 10, mounted on the bracket 11 mounted on the frame of the solenoid plunger 12, the loading branch pipe 13, unit injector 14, the discharge pipe 15.

Disc granulator operates as follows.

The original dry powder served in a plate 2 of the granulator through the feeding pipe 13, include the drive 3 of rotation of the plate, rotating the plate 2 roller plunger 10 through contact with the Cam 9 rotates the plate relative to the rotary axis 5, which provides simultaneous rotation and rocking of the plate from one drive, while physical pendulum, consisting of a plate 2, a drive of rotation of the plate 3, the bracket 4, the swivel axis 5, the rods 6, the counterweight 7, oscillates with respect to the frame 1 with bearings 8 at the natural frequency, the value of which is regulated by the position and mass of the counterweight 7, and the mechanical mechanism of the descent of a physical pendulum, consisting of the Cam 9 and the plunger 10, pushes the physical pendulum, filling p is tnica on the air, the mechanical mechanism of descent may be replaced by an electromagnetic mechanism of the shutter 12, which tells electromagnetic pulse with the passage of the counterweight 7 on the electromagnetic mechanism of the shutter 12. When the contact drops of liquid sprayed by the injector arm Assembly 14, with powder, supplied in plate 2 through the feeding pipe 13, is the adhesion of powder particles in clumps, which are involved in the layer rotating and presuposes powder and roll down the surface layer, with lumps ukatyvayutsya in spherical granules, the rate of release of granules from a layer on a surface depends on the frequency of rotation of the plate and the angle of its inclination and limited internal friction in the layer, reducing internal friction in the layer contributes to the oscillatory motion of the plate, which leads to an increase in the rate of output granules on the surface, their rapid rolling about the surface in the discharge pipe 15, which provides the growth performance of the granulator.

The proposed construction of a disc granulator allows to reduce the metal content due to the optimal size of the plate and use a single actuator to rotate and swing the plate, in addition, the setting parameters of a physical pendulum in the er friction, that reduces specific energy consumption for the preparation of granules, and the combination of rotation and swing the plate allows to increase the productivity of the pellet due to the accelerated release of granules from the deep layer to the surface.

The development of disc granulator with an optimal ratio of the length of the plate to its diameter (H/D = 1/3 showed that its implementation can reduce the weight of the plate by 18% compared to the disc pelletizer equal performance and the plate with the ratio H/D = 0,145 adopted for most of the manufactured disc granulators.

1. Disc granulator containing a frame, an inclined plate, a motor for rotation of the plate around its Central axis, the drive of the swing plate, loading and unloading spouts, characterized in that it is equipped with drive rotation of the plate with the axis of the non-coplanar and orthogonal to the axis of rotation of the plate, and drive the swing plate about an axis coinciding with the axis of rotation of the plate is made in the form of a physical pendulum with the trigger mechanism.

2. Disc granulator under item 1, characterized in that the ratio of the height of the side of the plate to its inner diameter is

< / BR>
where H is the height of the plate;

D - diametically pendulum is made in the form of a Cam mechanism with a roller follower.

4. Disc granulator under item 1, characterized in that the trigger mechanism of a physical pendulum is made in the form of an electromagnetic pulse of the pusher.

 

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