The way the landing thickening of the rod material and the device for its implementation


A61C17/18 - Chiselling scalers (A61C0017200000 takes precedence);;

 

(57) Abstract:

Usage: metal forming, in particular the landing to split the matrices in medical technology, namely in the operations of osteosynthesis in the treatment of fractures of tubular bones. The way the landing thickening of the rod material includes a clamp bar material in the split matrices and their mutual convergence under the force of the blow. In the process of the clip is the bending of the rod in an arc in the zone of deformation. Subsequent recovery in the straightness of the rod is in the process of landing thickening. The angle of the bending rod-shaped material and the total rotation angle of split matrices are in one plane, combined and equal. In the device for the landing thickening of the rod material of the Executive mechanism is a kinematic chain consisting of two planar multibody mechanisms, the links of the arrangements made in the form of two plates, the hinge rods and the Central rod. When this hinge rods one of its ends pivotally connected with the cross beams, and the other - with the crosshead. The drive performed percussion and coaxially located on the Central rod. Axis stroke boik is seeking to the field of metal forming, in particular for landing in split matrices, and is used primarily in medical technology, namely in the operations of osteosynthesis in the treatment of fractures of tubular bones.

Widely known methods of landing at the time of forming the heads of fasteners.

The closest technical solution, selected as a prototype, is the way of the landing thickening in separable matrices [1]

This method is to clamp the rod in a detachable matrix with a gap between them, approaching them under the force of the blow, landing and forming thickening in the zone of deformation. Thus the force of the blow sent straight line, along the line of the drop coincides with the longitudinal axis of the rod.

Also known device for the formation of a thickening of long workpieces. The closest to its destination device, taken as a prototype, is a device for the landing thickening rod material [2]

In this device, the actuator is made of a parallelogram, in the form of a hinge rod, hinge spacers and the Central rod, and the actuator is made of impact-axis movement of firing pin which is perpendicular to the axis of the landing and preseka the surrounding three pairs of hinge rods with ten hinges and a Central rod with shock brisk drive, sequentially arranged on the same axis, complicates the design and makes the device an elongated shape with a handle on the end that when holding with one hand creates a significant load on the brush.

In addition, the connected cable ends of the secondary winding of the transformer to the half-form on the other end of the device lead to the need for another arm to maintain it second hand. Therefore, to perform the necessary manipulations: the introduction of the rod on the line of the landing, his clip into the matrix and release needed the help of an assistant.

To service the adjusting nut spring firing pin located in a remote place, inside arm, need a special socket wrench, which also complicates the conditions.

The technical result to be obtained from use of the method of the landing thickening of the rod material and the device for its application are: simplifying the design, reducing the size and improving the operating conditions of the device by changing the way the landing and construction of the device for the application of thickening by replacing the counter-movement of matrices from rectilinear to curvilinear with pre-bend 2">

This is achieved in that the device for the landing thickening of the rod material, including the actuator and the actuator has a kinematic chain actuator, containing two planar four-link mechanism with three hinged and one translational pairs each having one hinge and translational pairs are common, and the links contain two hinge rod, crosshead and the Central rod, which traverses form a hinge, and the crosshead translational common pairs.

In Fig.1 shows the rod 1 with a thickening 2 and the reference area 3. The rod 1 may be round, square or other cross-section, the supporting platform 3 is conical, spherical and other shapes.

In Fig.2 shows the kinematic diagram of the device landing thickening of the rod material (the hammer shown in the cocked position, the trigger on the fuse). In Fig.3 presents the kinematic chain of the actuator device for the landing thickening of the rod material.

In Fig.4 shows a transverse section of the detailed decisions of the device along the line of landing at the destination position (axis eccentric conventionally taken in the plane of the section).

In Fig.6 shows a section detailed solutions clamped rod in the matrix in the final stage of the landing and forming thickening.

Device for the landing thickening of the rod material (see Fig.2) contains the actuator, which consists of two traverse 4, 5 with the common pivot bearing 6 located on the Central rod 7, the hinge rods 8, 9, who were among their ends pivotally connected with the cross beams 4, 5, and other crosshead 10. Movably mounted on a Central rod 7 the crosshead 10, forming with it the progressive pair 11, is constantly drawn in by the spring 12, which is directed against the force of the blow of the firing pin.

The drive device (see Fig. 2) made of spring percussion and consists of a firing pin 13 with a locking slot 14 and the handle 15. The hammer 13 is movably seated on the Central rod 7 and is preloaded by the spring 16, the second end of which abuts against the adjusting nut 17. Coverage striker 13 and springs 16 secured in a cylindrical casing 18, which on the one hand attached to the bracket 19, is rigidly connected to the Central rod 7 and the other movably supported on the heel 20, rigidly connected to the crosshead 10. The casing 18 from the top has a hole for the retaining slot 14, and skachivaniya it around the Central rod 7.

The trigger drive mechanism (see Fig.2) is located in the hollow handle 22 mounted on the bracket 19. The retaining plate 23, passing through the slot of the arm 22, one end rigidly connected with it, and the other ends of the stopper 24. In the slot of the handle 22 of the locking plate 23 is equipped with trigger button 25, and the stopper 24 is supported by the guide 26. The trigger mechanism is equipped with a fuse 27 and the button 28.

The kinematic chain of the actuator (see Fig.3) consists of two identical planar four-link mechanisms I and II, each of which has three hinge 6, 6', 6" and one translational 11 pairs. The mechanisms I and II, symmetrically located relative to each other, form a hinged pair 6 and translational couple of 11 total, one on two mechanisms. The links of the mechanisms I and II made in the form of a traverse 4 and 5, the hinge rods 8 and 9, the crosshead 10 and the Central rod 7. Working mechanisms (see Fig.2 and 4) providing a clamp rod, planting and shaping consist of two separable matrices with movable 29, 30 and 31 fixed, 32 half-form with grooves 33 located along the line of the landing, on the mating end faces which are forming holes 34. Movable mold halves 29, 30 articulated planted on the 30, 32 forms a clamping handle, the longitudinal axis of which is in the process of planting and shaping can be angled or coincide with the line of the landing.

The stationary mold halves 31, 32 are rigidly connected to the plates 35, 36 of fasteners (not shown) and a socket for connection of the secondary winding of the transformer.

Board 35, 36 are attached to the support plates 41, 42 through the plates 43, 44 and sleeve 45, 46, made of a dielectric material fasteners, eliminating the possibility of electrical contact between the plates 35, 36 and base plate 42, 41. Board 35, 36, plates 43, 44 and plates 41, 42 have end openings 47 for side filing bars line the landing.

The working mechanisms of the device are rigidly mounted on the free ends of the traverse 4, 5 for the support plates 41, 42 quick-acting clamps 48, 49, which together with the adjustable stops (not shown) to provide adjustment of the angle1needed to restore the straightness of bar material in the landing thickening.

Regulation of gap "a" between matrices (see Fig.2) working mechanisms mounted on the free ends of the traverse 4, 5, osushestvlyaetsya United with the cross beams 4, 5. The size of gap "a" varies from zero at the position of the adjustment nut 50 in the left-most position to a maximum at the extreme right position.

The device according to the invention provides for the planting and shaping thickening of the rod material in a cold state, and heating it in the zone of deformation. To do this on a fixed semi-molds 31, 32 provided with a socket for connection of the secondary winding of the transformer and the plates 43, 44 with the sleeves 45, 46, made of a dielectric material, which provide electrical and thermal isolation from the rest of the details and mechanisms of the device. The way the landing thickening of the rod material in the split matrices according to the invention is illustrated in the scheme (see Fig.5).

The scheme is conditionally shown in solid and dotted lines two beams with nipped in the matrices rod in the initial and final stages of the process of landing and forming thickening at their opposite convergence under the force of the blow. The thin line depicts the trajectory of the interfaces And In straight lengths of wire bent in an arc of radius R with center at point O. the Size L shoulder apps themselves at the interfaces And, And 2 - the angle between them in the beginning of the process of landing. Height thickening "b" is the distance between the matrices in the interfaces AND1B1straight line segments of the rod with a thickening, 2 the angle between them at the end of the landing process. 21= 2-2 angles of rotation matrices and bending of the rod when moving junction points of the arcs and .

The process of landing thickening of the rod material in the split matrices as follows. Rod material with a preliminary bending it in the process clamp on angle 2 is served in the diluted matrix to the size of "a" and clamped them in such a way that the clamp was carried out in the interfaces a and B.

At the opposite approximation of matrices under the action of the impact force, the mating points a and b move along arcs, corresponding to corner 21= 2-2. At the same time straight ends of the rod-shaped material, together with the matrices in the process of landing and forming rotated at the same angle1.

Due to the fact that the bending rod-shaped material and the angle of rotation matrices are in one plane, combined and equal, is of uniform diameter height thickening and restored the rod straightness mA the I to the contact of the mating surfaces. The diameter of the thickening D, depending on the size of the gap "a", turn the adjusting nut to 50 in one direction or the other may vary from a minimum of a D D up to a maximum of D (D0without breaking the straightness of the rod.

Device for the landing thickening of the rod material is as follows.

Before you begin the device provides several preparatory operations, tuning it to the required size and section of the rod-shaped material, and the diameter of the nodules, and the form of foothold. For this pair of mechanisms going with the required matrices and adjustable stop (not shown) for securing the device to the desired value of the angle1when fixing them fast clamps 48, 49 at the free end of the traverse 4, 5.

The size of gap "a" is dependent on the size of the bulb, install the adjusting nut 50. Control over the size of the gap is visually on a scale adjusting nut 50 (scale and risk not shown).

The cocked firing pin on the original shock position by moving the arm 15 along the groove 21 of the casing 18 to hold the stopper 24 in the stop slot 14. With the extended actuation of the actuator when the button 25 is provided by moving the fuse button 27 28 in the extreme right position. At the same time preparing the device for operation ends.

Pre-bent rod-shaped material in the process of clamping angle 21through mechanical cutouts 47 is fed to the line of the landing and in the grooves 33 between the movable 29, 30 and 31 fixed, 32 half-form in the desired location clamped the eccentrics 37, 38 by the rotation of the arms 39, 40. For rod small cross section and of a soft material with a yield strengtht0.5 kgf/mm2bending is made directly at the dock in the matrix. After clamping the rod in one matrix manually, it is bent at angle 21and clamped in the second matrix.

For the implementation of impact striker 13 before clicking on the launch button 25 should the trigger be removed from the fuse. This is done by moving the button 28 in the leftmost position, and the fuse 27 releases the lock plate 23. After actuation of the drive force of the blow striker 13 is transferred from the heel 20 of the crosshead 10 and through the hinge rods 8, 9 and beam 4, 5 to the matrix working arrangements, where it is concentrated in the zone of deformation of the rod and the landing thickening and forming a support point. Simultaneously with the air occurs and recovery premoli 13 on the original shock position the device is ready for re-application thickening on the rod of the same diameter and obtain foothold a similar form.

On the rod material made of steel with yield strengtht> 0.5 kgf/mm2, landing thickening and forming a support point is carried out with heating in the deformation zone to a temperature at which the material of the rod acquires plasticity, close to plasticity soft with a limit of ductilityt0.5 kgf/mm2,

In medical technology, surgery and traumatology, the rod of circular cross section with a diameter from 1 to 2 mm stainless steel with a clean and smooth surface, designed for osteosynthesis of fractures of the limbs, is called a spoke. Therefore, in the description of work of the proposed method and device used in medical technology, instead of the General term "rod material" will be used a specific term spoke.

In medical practice for the implementation of osteosynthesis with the use of external structures are thicker spokes 2 and a different form of foothold 3. Thickening on the needle more often applied by overlaying method with the use of precious metals and subsequent mechanical processing.

The use of the device and method according to the present invention not only eliminates the need for time-consuming pre is ü the operating conditions of the device.

In the specific example used for maximum diameter spokes d 2 mm stainless steel 20X13 landing thickening is only possible by heating it in the deformation zone to a temperature of 1200oC, at which the yield strength reaches t(g) 0.5 kgf/mm2.. Preliminary preparation device (see Fig. 5) for the landing thickening diameter D 1.5 d 1.5 x 2 3 mm and a height b d 2 mm, the required clearance is equal to = 3d=32=6 mm.

At a given radius R 60 mm arc length can be set at a 6 mm Length of a circle with radius R 60 mm will be 2R 2 x 3,14 x 60 376,8 mm, then the ratio 376,8 360oit is seen that 1 is about 1 mmo. In this case, the angle 2 with the arc of 6 mm is equal to 2 6a 2 arc b equal to 2 mm 22therefore, 21=2-2 6o2o4oor12o.

With these values of the diameter of the spokes d 2 mm, the gap "a" is 6 mm, the total bending angle 214and the ratio of d:R 2:60 1:30, insert it into the matrix of the device can be carried out without pre-bend, directly in the device. After clamping the spokes of a single matrix, manually within the elastic deformation or close to it she is bent on an angle 21= 4and clamped in verimli 48, 49 working arrangements, pre-configured on the required size of the spokes. In practice, it is necessary 2 to 3 pairs of interchangeable working mechanisms. Quick change working arrangements convenient to switch to a different diameter spokes and run and sterilization devices. For spokes of a smaller diameter and with the same ratio of its diameter thickening D, the gap "a" height "b" and at the same radius R of the conditions of the landing thickening will be even more favorable.

Heating spokes after clip of her in the matrix at the desired location for the landing of the thickening is produced by the transformer, time relay, signal lights and a foot pedal switch (not shown) that connect to an electrical outlet. The switch foot pedal, warning light illuminates, includes transformer and relay time. After reaching the required temperature for heating the spokes in the zone of deformation, time delay of about 5 to 6 sec time relay disconnects the transformer and signal light bulb.

Visual inspection of time of heating is included in the signal light, and then by clicking on the launch button 25 is activated, the actuator and the needle is landing thickening, fixcentral 37, 38, the needle is released from the clip matrix, and the process of landing thickening and forming a support point is finished.

As the analysis shows a concrete example, the use of technical solutions proposed method and device for the landing thickening and forming a support point on the needle is not large additional inconvenience, and a positive result is obvious.

Thus, using the proposed methods of landing thickening of the rod material and the device for its application simplifies the design of the actuator (instead of the three pairs of hinge rods and ten hinges remain one pair of hinge rods, five hinges and one translational pair), reduced length (due to the combination of the Central rod and actuator) and improve conditions of use (the ability to hold and manipulate the device with one hand, improved access to the adjusting nuts). While you can still get the thickening and the need to form a thrust pad when turning processes with warranty shapes and sizes.

Furthermore, the method and device according to the invention allow for menadione R, and also allow you to use the power of the device, an actuator with adjustable gap and drive with adjustable impact force as a multifunctional module for execution of various works.

Getting thickening and forming a platform according to the invention was confirmed experimentally. Currently developed working drawings and made a prototype using the proposed technical solutions.

1. The way the landing thickening of the rod-shaped material, comprising a clamp bar material in spaced with a gap of one relative to the other separable matrices, counter their convergence under the force of the blow, landing and forming thickening in the zone of deformation, characterized in that in the process of clamping bars in split matrices realize it bend along the arc of a circle on the area which is limited by the zone of deformation, due to the position of the longitudinal axis of the clamping stream matrix, through which passes the rod material at an angle relative to the axis of its submission, and in the process of landing and forming thickening restore the straightness of bar material due to meet the bending of the longitudinal axis of the rod-shaped material and the angles to the longitudinal axis of the clamping stream split matrices are in one plane, combined and equal.

3. Device for the landing thickening of the rod material containing the actuating mechanism in the form of a kinematic chain consisting of two identical, symmetrically located relative to each other planar multibody mechanisms, in which the links are made in the form of two traverse and associated hinge rod, and the actuator is made of impact-axis stroke firing pin which passes through the point of forming thickening, characterized in that the kinematic chain of the actuator contains two planar four-link mechanism with three hinged and one translational pairs each having one hinge and translational pairs are common, and the links contain two hinge rod, crosshead and the Central rod, which traverses form a hinge, and the crosshead translational common pairs.

 

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