Tabletting mechanism of pharmaceutical tablet press

Abstract

The utility model relates to a tableting mechanism of a pharmaceutical tableting machine, which belongs to the technical field of pharmaceutical tableting machines and comprises a bottom plate, supporting rods are fixed at the left end and the right end of the upper surface of the bottom plate, a same top plate is fixed at the tops of the two supporting rods, and cylinders are fixed at the left end and the right end of the lower surface of the top plate. Piston rods of the two air cylinders are fixedly provided with the same pressing plate, a plurality of pressing rods are fixed to the lower surface of the pressing plate, tablet pressing mechanisms used for pressing tablets are arranged at the left end and the right end of the upper surface of the bottom plate correspondingly, and stacking mechanisms are arranged at the left end and the right end of the upper surface of the bottom plate and located on the opposite sides of the supporting rods on the front side and the rear side. According to the tabletting mechanism of the pharmaceutical tabletting machine, the two templates are arranged as double processing stations, so that a worker can fill tablet particles into the other template when tabletting is carried out in one template, the tabletting efficiency of the pharmaceutical tabletting machine is greatly improved, the stability is high, tablets can be conveniently pushed out of the templates, and the working efficiency is improved. And the practicability is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pharmaceutical tablet press technical field, concretely is a kind of tableting mechanism of pharmaceutical tablet press. BACKGROUND

[0002] Tablet press is mainly used for tablet process research in pharmaceutical industry, and the tablet press is an automatic continuous production equipment for pressing granular materials into circular, special-shaped and tablet-shaped materials with text, symbol and pattern, with a diameter of not more than 13 mm. Some pharmaceutical tablet presses produce burrs and dust during tablet pressing, and must be matched with a screening machine to simultaneously remove dust, and must meet the GMP specification.

[0003] Through retrieval, it is found that the patent announcement number CN219076640U discloses a tableting mechanism of pharmaceutical tablet press, which comprises a support assembly, a lower die assembly, a tableting assembly and a jacking assembly. The lower die assembly is arranged on the support assembly and comprises a lower die shell, a die cavity and a connecting frame. The lower die shell is provided with uniformly distributed die cavities, and the bottom of the lower die shell is provided with a connecting frame. The tableting assembly is arranged on the support assembly. The jacking assembly is arranged on the connecting frame and comprises a jacking part, a support plate and a jacking column. The jacking part is fixed on the connecting frame, the support plate is arranged on the top of the jacking part, and the jacking column is inserted into the die cavity on the top of the support plate. The pharmaceutical tablet is pressed by the tableting assembly. After the tabletting is completed, the jacking part drives the jacking column to rise, and the tablet is ejected from the die cavity, so that the tablet after tableting is conveniently taken out. However, in the utility model, no structure is arranged for positioning the lower die shell when the tablet is ejected from the die cavity, and the lower die shell may be pushed upward when the tablet is ejected, thereby increasing the difficulty of taking out the tablet. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides a tableting mechanism of pharmaceutical tablet press, which has the advantages of high stability and facilitating the ejection of tablets, and solves the problem that no structure is arranged for positioning the lower die shell when the tablet is ejected from the die cavity, and the lower die shell may be pushed upward when the tablet is ejected, thereby increasing the difficulty of taking out the tablet.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a tableting mechanism of pharmaceutical tablet press, comprising a bottom plate, support rods are fixed on the left and right ends of the upper surface of the bottom plate, the same top plate is fixed on the top of the two support rods, air cylinders are fixed on the left and right ends of the lower surface of the top plate, the same pressing plate is fixed on the piston rod of the two air cylinders, a plurality of pressing rods are fixed on the lower surface of the pressing plate, a tablet pressing mechanism for pressing tablets is arranged on the left and right ends of the upper surface of the bottom plate, and a stacking mechanism is arranged on the opposite side of the front and rear support rods on the left and right ends of the upper surface of the bottom plate.

[0006] The medicine pressing mechanism comprises two supporting plates, four mounting blocks, a threaded rod, two threaded sleeves, a limiting rod, two limiting sleeves, four connecting rods and two molds, both of the supporting plates are fixed on the left and right ends of the upper surface of the bottom plate, the four mounting blocks are respectively fixed on the front and rear ends of the opposite sides of the two supporting plates, the threaded rod is rotatably connected between the opposite sides of the left two mounting blocks through a bearing, the threaded sleeve is threadedly connected with the threaded rod, the limiting rod is fixed between the opposite sides of the right two mounting blocks, the limiting sleeve is slidably connected with the limiting rod, the four connecting rods are respectively fixed on the upper surfaces of the two threaded sleeves and the two limiting sleeves, and the molds are fixed on the upper surfaces of the threaded sleeves and the limiting sleeves.

[0007] By adopting the technical scheme, the two molds are provided as double processing positions, so that the staff can perform tablet pressing in one mold while performing tablet particle filling in the other mold, thereby greatly improving the tablet pressing efficiency of the pharmaceutical tablet press, and the stability is high, the tablets can be easily pushed out of the mold, and the practicality is greatly improved.

[0008] Further, sliding holes are formed in the left and right ends of the upper surface of the pressing plate, and the inner diameter of the sliding hole is matched with the outer diameter of the supporting rod.

[0009] By adopting the technical scheme, the sliding hole can limit the movement of the pressing plate, so that the pressing plate can move linearly downward.

[0010] Further, the front face of the mounting block on the left end is fixed with a driving motor, the output shaft of the driving motor penetrates the mounting block on the left end and extends to the rear side of the mounting block on the left end and is fixed with the threaded rod.

[0011] By adopting the technical scheme, the output shaft of the driving motor can drive the rotation of the threaded rod, thereby moving the two molds.

[0012] Further, a plurality of mold holes are formed in the upper surface of the mold, the outer diameter of the pressing rod is matched with the inner diameter of the mold hole, and the mold hole is one-to-one corresponding to the pressing rod.

[0013] By adopting the technical scheme, the pressing rod is facilitated to be in the mold hole.

[0014] Further, a connecting box is fixed to the lower surface of the mold, electric push rods are fixed to the left and right ends of the inner bottom wall of the connecting box, the same movable plate is fixed to the top of the two electric push rods, a plurality of fixing rods are fixed to the upper surface of the movable plate, and pulleys are fixed to the left and right ends of the lower surface of the connecting box.

[0015] Further, the left and right ends of the upper surface of the bottom plate are provided with sliding rails matching the size of the pulleys, the outer diameter of the fixed rod is equal to that of the pressing rod, the pressing rod corresponds to the fixed rod one by one, the top of the opposite side of the left and right side walls of the inner cavity of the connecting box is provided with a sliding groove, and the left and right sides of the movable plate are fixedly provided with sliding blocks.

[0016] By adopting the technical scheme, the fixed rod can enter the bottom of the mold hole cavity to provide support for the tablet particles.

[0017] Further, the accumulation mechanism comprises two mounting plates, a rotating motor, a bidirectional screw rod, two movable sleeves and two push blocks, the two mounting plates are fixed on the left and right ends of the upper surface of the bottom plate and the opposite side of the front and rear side supporting rods, the rotating motor is fixed on the front end of the left side of the left end mounting plate, the output shaft of the rotating motor penetrates through the left end mounting plate and extends to the right side of the left end mounting plate and is fixed with the bidirectional screw rod, the movable sleeves are threadedly connected with the bidirectional screw rod, and the push blocks are fixed on the lower surfaces of the movable sleeves.

[0018] By adopting the technical scheme, the pushed-out tablets can be moved to the center of the mold plate, which is convenient for the staff to collect and improves the efficiency and convenience of the staff when collecting the tablets.

[0019] Further, the bidirectional screw rod is rotatably connected with the mounting plate through a bearing, the two movable sleeves are symmetrically distributed on the left and right sides of the vertical central axis of the bidirectional screw rod, the rear ends between the opposite sides of the two mounting plates are fixed with a positioning rod, the left and right ends of the outer surface of the positioning rod are slidably connected with positioning sleeves, the lower surfaces of the positioning sleeves are fixed with the rear end of the upper surface of the push block, the cross section of the push block is trapezoidal, and the push block is a rubber block.

[0020] By adopting the technical scheme, the positioning rod and the positioning sleeve can limit the movement of the two movable sleeves, so that the two movable sleeves can only move linearly.

[0021] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0022] 1. The tabletting mechanism of the pharmaceutical tablet press has two mold plates for double processing positions, so that the staff can perform tabletting on one mold plate while performing tablet particle filling operation on the other mold plate, thereby greatly improving the tabletting efficiency of the pharmaceutical tablet press, and the stability is high, the tablets can be easily pushed out of the mold plate, and the practicality is greatly improved.

[0023] 2、The tabletting mechanism of the pharmaceutical tablet press is provided with the stacking mechanism, which can make the two push blocks move relatively, and then can move the pushed-out tablets to the center of the template, so as to facilitate the staff to collect the tablets and improve the efficiency and convenience of the staff when collecting the tablets. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of the utility model;

[0025] Figure 2 It is a structural schematic view of the tablet pressing mechanism of the utility model;

[0026] Figure 3 It is a side view schematic view of the threaded rod structure of the utility model;

[0027] Figure 4 It is a structural schematic view of the stacking mechanism of the utility model.

[0028] In the drawing: 1, bottom plate; 2, support rod; 3, top plate; 4, air cylinder; 5, pressing plate; 6, pressing rod; 7, tablet pressing mechanism; 71, support plate; 72, mounting block; 73, threaded rod; 74, threaded sleeve; 75, limiting rod; 76, limiting sleeve; 77, connecting rod; 78, template; 8, stacking mechanism; 81, mounting plate; 82, rotating motor; 83, bidirectional screw rod; 84, movable sleeve; 85, push block. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] Please refer to Figure 1 The tablet pressing mechanism of the pharmaceutical tablet press in the embodiment comprises a bottom plate 1, support rods 2 are fixed to the left and right ends of the upper surface of the bottom plate 1, a same top plate 3 is fixed to the top of the two support rods 2, air cylinders 4 are fixed to the left and right ends of the lower surface of the top plate 3, a same pressing plate 5 is fixed to the piston rods of the two air cylinders 4, a plurality of pressing rods 6 are fixed to the lower surface of the pressing plate 5, tablet pressing mechanisms 7 for pressing tablets are arranged at the left and right ends of the upper surface of the bottom plate 1, and stacking mechanisms 8 are arranged at the left and right ends of the upper surface of the bottom plate 1 and on the side opposite to the support rods 2 on the front and back sides.

[0031] In the embodiment, sliding holes are formed at the left and right ends of the upper surface of the pressing plate 5, the inner diameter of the sliding hole is matched with the outer diameter of the support rod 2, and the sliding hole can limit the movement of the pressing plate 5, so that the pressing plate 5 can move linearly downward.

[0032] It can be understood that the starting cylinder 4, the piston rod of the cylinder 4 is elongated, and then the pressing plate 5 moves downward, the movement of the pressing plate 5 drives the pressing rod 6 to move downward until the pressing rod 6 enters the die hole on the die plate 78, so that the tablet particles can be extruded, and after extrusion, the piston rod of the cylinder 4 moves upward, so that the pressing rod 6 moves out of the die hole and is located on the upper side of the die plate 78.

[0033] Please refer to Figures 2-3 In order to have higher stability during tabletting, the tablet pressing mechanism 7 in the embodiment comprises two supporting plates 71, four mounting blocks 72, a threaded rod 73, two screw sleeves 74, a limiting rod 75, two limiting sleeves 76, four connecting rods 77 and two die plates 78. The two supporting plates 71 are fixed on the left and right ends of the upper surface of the bottom plate 1. The four mounting blocks 72 are respectively fixed on the front and rear ends of the opposite sides of the two supporting plates 71. The threaded rod 73 is rotatably connected between the opposite sides of the left two mounting blocks 72 through bearings. The screw sleeves 74 are threadedly connected with the threaded rod 73. The rotation of the threaded rod 73 moves the two screw sleeves 74 threadedly connected on the surface thereof towards the end close to the lower side of the pressing rod 6.

[0034] The limiting rod 75 is fixed between the opposite sides of the right two mounting blocks 72. The limiting sleeves 76 are slidably connected with the limiting rod 75. The limiting rod 75 and the limiting sleeve 76 provided can limit the movement of the screw sleeve 74, so that the screw sleeve 74 can only move linearly. The four connecting rods 77 are respectively fixed on the upper surfaces of the two screw sleeves 74 and the two limiting sleeves 76. The die plates 78 are fixed on the upper surfaces of the screw sleeves 74 and the limiting sleeves 76. The movement of the screw sleeves 74 and the limiting sleeves 76 moves the connecting rods 77, which in turn drives the two die plates 78 to move until the die plate 78 containing the tablet particles moves to the lower side of the pressing plate 5.

[0035] In the embodiment, the front surface of the left end front mounting block 72 is fixed with a driving motor. The output shaft of the driving motor penetrates the left end front mounting block 72 and extends to the rear side of the left end front mounting block 72 and is fixed with the threaded rod 73. The upper surface of the die plate 78 is provided with a plurality of die holes. The outer diameter of the pressing rod 6 is matched with the inner diameter of the die hole. The die hole corresponds to the pressing rod 6 one by one.

[0036] By providing two die plates 78, the staff can perform tabletting operation in one die plate while performing tablet particle filling operation in the other die plate. This greatly improves the tabletting efficiency of the pharmaceutical tablet press, reduces the waiting time and improves the production efficiency.

[0037] The lower surface of the template 78 is fixed with a connecting box, the left and right ends of the bottom wall in the connecting box are fixed with electric push rods, the top of the two electric push rods is fixed with the same movable plate, the upper surface of the movable plate is fixed with a plurality of fixed rods, the left and right ends of the lower surface of the connecting box are fixed with pulleys, the left and right ends of the upper surface of the bottom plate 1 are provided with slide rails matched with the size of the pulleys, the outer diameter of the fixed rod is equal to the outer diameter of the pressure rod 6, the pressure rod 6 corresponds to the fixed rod one by one, the top of the left and right side walls of the inner cavity of the connecting box is provided with a sliding groove, the left and right sides of the movable plate are fixed with sliding blocks, and the sliding blocks do linear motion up and down in the inner cavity of the sliding groove.

[0038] It can be understood that the two electric push rods are started, the piston rods of the two electric push rods move upwards, and then the movable plate can be pushed to move upwards, the movement of the movable plate makes the plurality of fixed rods enter the inner cavity of the die hole, so as to provide support for the tablet particles entering the inner cavity of the die hole; by moving the piston rod of the electric push rod upwards, the fixed rod can push the tablet to move upwards until the tablet moves out of the die hole.

[0039] It should be noted that the two templates 78 are fixed with a linkage rod, the two templates 78 are provided as double processing positions, so that the staff can perform tabletting in one template 78 while filling tablet particles in the other template 78, thereby greatly improving the tabletting efficiency of the pharmaceutical tablet press.

[0040] Please refer to Figure 4 , in order to facilitate the staff to collect tablets, the stacking mechanism 8 in the embodiment includes two mounting plates 81, a rotating motor 82, a bidirectional screw rod 83, two movable sleeves 84 and two push blocks 85, the two mounting plates 81 are fixed on the left and right ends of the upper surface of the bottom plate 1 and the side opposite to the front and rear side supporting rods 2, the rotating motor 82 is fixed on the front end of the left side of the left mounting plate 81, the output shaft of the rotating motor 82 penetrates the left mounting plate 81 and extends to the right side of the left mounting plate 81 and is fixed with the bidirectional screw rod 83, the movable sleeves 84 are threadedly connected with the bidirectional screw rod 83, the rotating motor 82 is started, the output shaft of the rotating motor 82 rotates to drive the bidirectional screw rod 83 to rotate, the rotation of the bidirectional screw rod 83 makes the two movable sleeves 84 threadedly connected on the surface thereof move relatively, the push blocks 85 are fixed on the lower surface of the movable sleeves 84, the movement of the two movable sleeves 84 drives the two push blocks 85 to move relatively, thereby the tablets can be pushed to the center of the template 78, which is convenient for the staff to collect.

[0041] The bidirectional screw 83 is rotatably connected with the mounting plate 81 through a bearing, the two movable sleeves 84 are symmetrically distributed on the left and right sides of the vertical central axis of the bidirectional screw 83, the rear end between the two mounting plates 81 on one side is fixedly connected with a positioning rod, the left and right ends on the outer surface of the positioning rod are slidably connected with positioning sleeves, the lower surface of the positioning sleeve is fixedly connected with the rear end of the upper surface of the push block 85, the positioning rod and the positioning sleeve are arranged to limit the movement of the two movable sleeves 84, so that the two movable sleeves 84 can only move linearly, and the cross section of the push block 85 is trapezoidal, and the push block 85 is a rubber block.

[0042] The accumulation mechanism 8 comprises two mounting plates 81, a rotating motor 82, a bidirectional screw 83, two movable sleeves 84 and two push blocks 85. The rotating motor 82 drives the bidirectional screw 83 to rotate, and the two movable sleeves 84 and the push block 85 move relatively to push the tablets to the center of the template 78, so as to facilitate the staff to collect the tablets, and improve the collection efficiency and convenience.

[0043] It should be noted that the distance between the bidirectional screw 83 and the positioning rod is greater than the width of the template 78, and the width of the push block 85 is equal to the width of the template 78.

[0044] Through the above design, the tablet pressing mechanism of the pharmaceutical tablet press not only improves the tablet pressing efficiency and stability, but also solves the problems of difficult tablet taking and concentrated collection, so that the whole tablet pressing process is more efficient, flexible and reliable. These characteristics make it have high practical value in practical application.

[0045] The working principle of the above embodiment is as follows:

[0046] (1) When using the pharmaceutical tablet press, start the two electric push rods, and the piston rods of the two electric push rods move upward, thereby pushing the movable plate upward, the movement of the movable plate enables the plurality of fixed rods to enter the inner cavity of the die hole, thereby providing support for the tablet particles entering the inner cavity of the die hole, and then by placing the tablet particles into the plurality of die holes on the upper surface of one of the die plates 78, starting the drive motor, the output shaft of the drive motor rotates to drive the threaded rod 73 to rotate, the rotation of the threaded rod 73 moves the two threaded sleeves 74 threaded on the surface thereof to the end close to the lower side of the pressing rod 6, the limiting rod 75 and the limiting sleeve 76 are arranged to limit the movement of the threaded sleeve 74, so that the threaded sleeve 74 can only move linearly, the movement of the threaded sleeve 74 and the limiting sleeve 76 moves the connecting rod 77, thereby driving the two die plates 78 to move, at this time the two connecting boxes also move linearly, until the die plate 78 containing the tablet particles moves to the lower side of the pressing plate 5, then the drive motor is turned off, at this time the worker can put the tablet particles into the die plate 78 which does not contain the tablet particles, start the air cylinder 4, the piston rod of the air cylinder 4 is elongated, thereby moving the pressing plate 5 downward, the movement of the pressing plate 5 drives the pressing rod 6 to move downward, until the pressing rod 6 enters the die hole on the die plate 78, thereby extruding the tablet particles, after extrusion the piston rod of the air cylinder 4 moves upward, so that the pressing rod 6 moves out of the die hole and is located on the upper side of the die plate 78, then by moving the piston rod of the electric push rod upward, the fixed rod can push the tablet upward until the tablet moves out of the die hole.

[0047] (2) Then start the rotating motor 82, the output shaft of the rotating motor 82 rotates to drive the bidirectional screw rod 83 to rotate, the rotation of the bidirectional screw rod 83 causes the two movable sleeves 84 threaded on the surface thereof to move relatively, the movement of the two movable sleeves 84 drives the two push blocks 85 to move relatively, thereby enabling the tablet to be pushed to the center of the die plate 78, facilitating the worker to collect; after collection, the output shaft of the drive motor can be started to rotate, so that the other die plate 78 is located below the pressing plate 5 for tablet pressing operation, the worker can place the tablet particles again on the die plate 78 after tablet pressing.

Claims

1. A tabletting mechanism of a pharmaceutical tablet press comprising a base plate (1), characterized in that: The upper surface of the bottom plate (1) is fixed with support rods (2) at left and right ends, the top of the two support rods (2) is fixed with the same top plate (3), the lower surface of the top plate (3) is fixed with air cylinders (4) at left and right ends, the piston rod of the two air cylinders (4) is fixed with the same pressing plate (5), the lower surface of the pressing plate (5) is fixed with a plurality of pressing rods (6), the upper surface of the bottom plate (1) is provided with pressing tablet mechanisms (7) at left and right ends for pressing tablets, the upper surface of the bottom plate (1) is provided with accumulation mechanisms (8) at left and right ends and opposite sides of the support rods (2). The pressing tablet mechanism (7) comprises two support plates (71), four mounting blocks (72), a threaded rod (73), two screw sleeves (74), a limiting rod (75), two limiting sleeves (76), four connecting rods (77) and two templates (78), the two support plates (71) are fixed at left and right ends of the upper surface of the bottom plate (1), the four mounting blocks (72) are fixed at left and right ends of opposite sides of the two support plates (71), the threaded rod (73) is rotatably connected between opposite sides of the left two mounting blocks (72), the screw sleeve (74) is threadedly connected with the threaded rod (73), the limiting rod (75) is fixed between opposite sides of the right two mounting blocks (72), the limiting sleeve (76) is slidably connected with the limiting rod (75), the four connecting rods (77) are fixed on the upper surfaces of the two screw sleeves (74) and the two limiting sleeves (76), and the template (78) is fixed on the upper surfaces of the screw sleeve (74) and the limiting sleeve (76).

2. The tablet press mechanism of a pharmaceutical tablet press according to claim 1, characterized in that: The upper surface of the pressing plate (5) is provided with sliding holes at left and right ends, and the inner diameter of the sliding hole is matched with the outer diameter of the support rod (2).

3. The tablet press mechanism of claim 1, wherein: The front surface of the mounting block (72) at the left end is fixed with a driving motor, the output shaft of the driving motor penetrates the mounting block (72) at the left end and extends to the rear side of the mounting block (72) at the left end and is fixed with the threaded rod (73).

4. The tablet press mechanism of claim 1, wherein: The upper surface of the template (78) is provided with a plurality of mold holes, the outer diameter of the pressing rod (6) is matched with the inner diameter of the mold hole, and the mold hole is in one-to-one correspondence with the pressing rod (6).

5. The tabletting mechanism of a pharmaceutical tablet press according to claim 1, characterized in that: The lower surface of the template (78) is fixed with a connecting box, the left and right ends of the inner bottom wall of the connecting box are fixed with electric push rods, the top of the two electric push rods is fixed with the same movable plate, the upper surface of the movable plate is fixed with a plurality of fixing rods, and the left and right ends of the lower surface of the connecting box are fixed with pulleys.

6. The tabletting mechanism of a pharmaceutical tablet press according to claim 5, characterized in that: The upper surface of the bottom plate (1) is provided with sliding rails matched with the size of the pulley at left and right ends, the outer diameter of the fixing rod is equal to the outer diameter of the pressing rod (6), the pressing rod (6) is in one-to-one correspondence with the fixing rod, the top of the left and right side walls of the inner cavity of the connecting box is provided with a sliding groove, the left and right sides of the movable plate are fixed with sliding blocks, and the sliding blocks make up-down linear motion in the inner cavity of the sliding groove.

7. The tabletting mechanism of a pharmaceutical tablet press according to claim 1, characterized in that: Said accumulation mechanism (8) includes two mounting plates (81), a rotating motor (82), a bidirectional screw (83), two movable sleeves (84) and two push blocks (85), both mounting plates (81) are fixed on the left and right ends of the upper surface of the bottom plate (1) and the side opposite to the front and back two side supporting rods (2), the rotating motor (82) is fixed on the front end of the left side of the left mounting plate (81), the output shaft of the rotating motor (82) penetrates through the left mounting plate (81) and extends to the right side of the left mounting plate (81) and is fixed with the bidirectional screw (83), the movable sleeve (84) is threadedly connected with the bidirectional screw (83), and the push block (85) is fixed on the lower surface of the movable sleeve (84).

8. The tabletting mechanism of a pharmaceutical tablet press according to claim 7, characterized in that: Said bidirectional screw (83) is rotatably connected with the mounting plate (81) through a bearing, both movable sleeves (84) are symmetrically distributed on the left and right sides of the vertical central axis of the bidirectional screw (83), a positioning rod is fixed at the rear end between the opposite sides of both mounting plates (81), positioning sleeves are slidably connected on the outer surface of the left and right ends of the positioning rod, the lower surface of the positioning sleeve is fixed with the rear end of the upper surface of the push block (85), the sectional shape of the push block (85) is trapezoidal, and the push block (85) is a rubber block.

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