Push-pull clamping mechanism for a syringe pump

Abstract

The utility model provides a kind of push-pull clamping mechanism of syringe pump, including shell, two recesses for accommodating syringe are set up on shell, push block is set on recess side and is in contact with the piston handle of syringe, fixed component is set on push block and is extended to the piston handle of syringe and is fixedly connected with the piston handle of syringe, push block is connected with shell by moving component, the push-pull clamping mechanism of this syringe pump, syringe is placed by recess, the piston handle of syringe is clamped and fixed with push block by fixed component, push block moves in horizontal direction by moving component, and then drive the piston handle of syringe fixed with push block to move, realize dosing, it is applicable to different specifications of syringe, improve the utilization of device, reduce the possibility that the piston handle is not fixed with push block and affect dosing amount.

Description

Technical Field

[0001] This utility model relates to the field of injection pump technology, specifically to a push-pull clamping mechanism for an injection pump. Background Technology

[0002] Microinfusion pumps, as a common clinical treatment method, have been widely applied in various fields of medical practice. The working principle of a microinfusion pump is based on a stepper motor as a power source. The system sends control pulses to rotate the stepper motor, which in turn rotates a lead screw. The lead screw drives the injection head on the transmission nut in a linear motion, thereby pushing the syringe piston in a linear motion. This causes the liquid inside the syringe to flow in one direction. The liquid propulsion speed can be adjusted by setting the rotation speed of the lead screw, thus adjusting the administered drug dosage. Simultaneously, a speed feedback system can ensure input, injection accuracy, and reliability within the adjustable rate range.

[0003] National standards only specify the capacity of syringes, without limiting the diameter-to-length ratio. Currently, the syringe slots of micro-injection pumps on the market are fixed, relying on a single clamp to press against the end of the syringe piston rod to fix the syringe. Although manufacturers claim that the syringes provided can be used for different sizes of syringes, the fixing effect is poor for some small-diameter syringes and their piston rods, and the tightness is difficult to guarantee. During the pushing process, the syringe tube will inevitably slip. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model proposes a push-pull clamping mechanism for an injection pump, including a housing. The housing has two grooves for accommodating syringes. A push block is provided next to the grooves to abut against the piston handle of the syringe. The push block is provided with a fixing component that extends into the syringe piston handle and is fixedly connected to the syringe piston handle. The push block is connected to the housing through a moving component.

[0005] To achieve the above objectives, a groove facilitates the placement of the syringe, a fixing component secures the syringe piston handle to the push block, and a moving component controls the horizontal movement of the push block, thereby moving the syringe piston handle fixed to the push block to achieve quantitative drug delivery. This is applicable to syringes of different sizes, improves the utilization rate of the device, and reduces the possibility that the dosage may be affected if the piston handle is not fixed to the push block.

[0006] Furthermore, the fixing assembly includes an A connecting plate and a B connecting plate fixed to the side of the push block facing the syringe and arranged coaxially. The A connecting plate and the B connecting plate are fixed by evenly arranged guide rods. The A connecting plate is fixed to the push block, and the B connecting plate is close to the syringe piston handle. A plurality of top plates are hinged to the A connecting plate. The plurality of top plates are arranged in a linear array with the center of the A connecting plate as the center. The B connecting plate has a movable groove adapted to the top plate. The end of the top plate away from the A connecting plate is set in the movable groove and is movably connected to the movable groove. The push block is provided with a control assembly for controlling the rotation of the top plate so as to lock and fix it with the syringe piston handle.

[0007] With the above technical solution, in the initial state, the B connecting plate extends into the middle recess of the syringe piston rod. Power is provided by the control component to drive several top plates to rotate around the center of the A connecting plate. The top plates rotate and abut against the middle recess of the syringe piston rod, so that the top plates are locked and fixed to the syringe piston rod, thereby realizing the fixed connection between the push block and the syringe piston handle.

[0008] Furthermore, the control component includes a screw that passes through and is rotatably connected to the push block. One end of the screw that extends out of the push block is coaxially fixed with a handle, and the other end that extends out of the push block passes through and is rotatably connected to the A connecting plate. One end of the screw that extends out of the A connecting plate is rotatably connected to the B connecting plate. An A support block and a B support block are sleeved on the screw, located between the A connecting plate and the B connecting plate. The diameter of the A support block is smaller than the diameter of the B support block. Both the A support block and the B support block are threadedly connected to the screw. Both the A support block and the B support block are sleeved outside the guide rod and are slidably connected to the guide rod.

[0009] The above technical solution provides power by manually rotating the handle, which drives the screw fixed coaxially with the handle to rotate. The rotation of the screw will drive the movement of support block A and support block B. The guide rod guides and limits the movement of support block A and support block B. The movement of support block A and support block B will drive the top plate that is in contact with support block A and support block B to rotate.

[0010] Furthermore, both sides of the top plate are integrally provided with extension plates, and the ends of the movable grooves are integrally provided with dead stops that are adapted to the extension plates.

[0011] With the above technical solution, through the cooperation of the extension plate and the dead stop, the top plate will not come off the B connecting plate under the action of gravity or pressure.

[0012] Furthermore, the movable assembly includes two opposing supports fixed in the inner cavity of the housing, a lead screw rotatably connected between the two supports, a movable block threadedly connected to the lead screw is sleeved on the lead screw, a guide rod located beside the lead screw is also fixed between the two supports, the movable block is sleeved on the guide rod and slidably connected to the guide rod, a sleeve is also fixed on the movable block, one end of the sleeve away from the movable block extends out of the adjacent support and is slidably connected to the support, one end of the sleeve extending out of the support is fixed to a push block, and a motor for driving the lead screw to rotate is fixed on the other support.

[0013] Through the above technical solution, the motor provides power to drive the lead screw, which is fixed coaxially with the output shaft of the motor, to rotate. The rotation of the lead screw will drive the moving block, which is threadedly connected to the lead screw, to move. The guide rod guides the movement of the moving block. The movement of the moving block will drive the sleeve, which is fixed to the moving block, to move. The support guides the movement of the sleeve. The movement of the sleeve will drive the push block, which is fixed to the sleeve, to move.

[0014] Furthermore, the push block is provided with two opposing clamping plates on the side facing the syringe. The clamping plates are integrally formed with a short shaft, which passes through the inner cavity of the push block and is rotatably connected to the push block. The inner cavity of the push block is provided with a drive assembly for controlling the rotation of the clamping plates to clamp the syringe piston handle.

[0015] The above technical solution provides power through a drive component, which drives two short shafts to rotate relative to each other. The rotation of the two short shafts will cause the clamping plate, which is fixed coaxially with the short shafts, to rotate, thereby clamping the piston handle of the syringe and further fixing the syringe.

[0016] Furthermore, the drive assembly includes a rotating block disposed within the inner cavity of the push block. A drive groove extends through the interior of the rotating block, and an internal gear is integrally mounted on the rotating block within the drive groove. Gear A and gear B, which mesh with each other, are also disposed within the drive groove. Gear A meshes with the internal gear, while gear B does not contact the internal gear. Both gear A and gear B are rotatably connected to the inner cavity of the push block. The portion of the short shaft that penetrates into the inner cavity of the push block is coaxially fixed with gear A and gear B, respectively. A rocker arm is also rotatably connected to the inner cavity of the push block. The end of the rocker arm away from the push block is movably connected to the rotating block via a tension spring. A power assembly for controlling the rotation of the rotating block is provided on the push block.

[0017] Through the above technical solution, power is provided by the power component to drive the rotating block to rotate. The rotation of the rotating block will drive the internal gear integrated with the rotating block to rotate. The rotation of the internal gear will drive the A gear meshing with the internal gear to rotate. The rotation of the A gear will drive the B gear meshing with the A gear to rotate, which in turn will drive the short shaft fixed to the A gear and the B gear to rotate, thereby driving the clamping plate fixed to the short shaft to rotate, so as to control the clamping or loosening of the syringe piston handle.

[0018] Furthermore, the power assembly includes a connecting rod that passes through the sleeve. One end of the connecting rod is rotatably connected to the moving block, and the other end enters the inner cavity of the push block and is rotatably connected to the push block. The connecting rod entering the inner cavity of the push block passes through the rotating block and is locked and fixed to the rotating block. The center line of the connecting rod is arranged coaxially with the center of the rotating block. The connecting rod passes through the rotating block and exits the push block. A movable handle is fixed to the part of the connecting rod that exits the push block. A fixed handle located next to the movable handle and cooperating with the movable handle is also fixed on the push block.

[0019] Through the above technical solution, by manually rotating the movable handle, the connecting rod and rotating block fixed to the movable handle are driven to rotate. The rotation of the rotating block will drive the internal gear integrated with the rotating block to rotate. The rotation of the internal gear will drive the A gear meshing with the internal gear to rotate. The rotation of the A gear will drive the B gear meshing with the A gear to rotate, thereby driving the rotation of the two clamping plates.

[0020] In summary, the push-pull clamping mechanism of this injection pump has the following beneficial effects:

[0021] (1) The push-pull clamping mechanism of the injection pump facilitates the placement of the syringe through the groove, and the fixing component makes the piston handle of the syringe clamped and fixed to the push block. The moving component controls the push block to move in the horizontal direction, thereby driving the piston handle of the syringe fixed to the push block to move, so as to realize quantitative drug administration. It is suitable for syringes of different specifications, improves the utilization rate of the device, and reduces the possibility that the piston handle is not fixed to the push block and thus affects the drug administration.

[0022] (2) The push-pull clamping mechanism of the injection pump is powered by a power component to drive the rotating block to rotate. The rotation of the rotating block will drive the internal gear integrated with the rotating block to rotate. The rotation of the internal gear will drive the A gear meshing with the internal gear to rotate. The rotation of the A gear will drive the B gear meshing with the A gear to rotate, which in turn drives the short shaft fixed with the A gear and the B gear to rotate, thereby driving the clamping plate fixed with the short shaft to rotate, so as to control the clamping or releasing of the syringe piston handle. Attached Figure Description

[0023] The present invention will be further described and explained below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the preferred embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the overall side view structure of this utility model;

[0026] Figure 3 This is a schematic diagram illustrating the structure of the lead screw of this utility model;

[0027] Figure 4This is a schematic diagram of the structure of the pusher block cavity of this utility model;

[0028] Figure 5 This is the utility model Figure 4 Enlarged structural diagram at point A in the middle;

[0029] Figure 6 This is a schematic diagram illustrating the structure of the internal gear of this utility model;

[0030] Figure 7 This is a structural schematic diagram of the top plate of this utility model.

[0031] Reference numerals: 1. Housing; 2. Groove; 3. Push block; 4. Fixing assembly; 401. A connecting plate; 402. B connecting plate; 403. Guide rod; 404. Top plate; 405. Movable groove; 406. Screw; 407. A support block; 408. B support block; 409. Extension plate; 5. Moving assembly; 501. Support; 502. Lead screw; 503. Moving block; 504. Guide rod; 505. Sleeve; 6. Clamping plate; 7. Short shaft; 8. Rotating block; 9. Drive groove; 10. Internal gear; 11. A gear; 12. B gear; 13. Swing rod; 14. Tension spring; 15. Connecting rod; 16. Movable handle; 17. Fixed handle; 18. Spring; 19. Pressing rod; 20. Slot. Detailed Implementation

[0032] The technical solution of this utility model will be more clearly and completely explained below with reference to the accompanying drawings and through the description of the preferred embodiments of this utility model.

[0033] like Figure 1-7 As shown, the preferred embodiment of this utility model provides a push-pull clamping mechanism for an injection pump, including a housing 1. The housing 1 has two grooves 2 for accommodating syringes. The housing 1 also has a slot 20 located beside the grooves 2 and clamped to the handle of the syringe housing. A crossbar is rotatably connected to the inner cavity of the housing 1. A clamping rod 19 is slidably connected to the crossbar. One end of the clamping rod 19 passes through the inner cavity of the housing 1 and is slidably connected to the inner cavity of the housing 1. The part of the clamping rod 19 that passes through the housing 1 is connected to the housing 1 by a spring 18 sleeved on the crossbar. A rubber pad is provided on the side of the clamping rod 19 facing the syringe.

[0034] like Figure 3 and Figure 4 and Figure 5 and Figure 6 and Figure 7A push block 3 is provided on the side of the slot 20 away from the groove 2, which abuts against the piston handle of the syringe. A cylindrical recess is provided in the middle of the conventional syringe piston rod. In order to fix piston rods of different sizes to the push block 3, the push block 3 is provided with a fixing component 4 that extends into the syringe piston handle and is fixedly connected to the syringe piston handle. The push block 3 is connected to the housing 1 through a moving component 5. The fixing component 4 is used to lock the syringe piston handle and the push block 3 in place. The moving component 5 controls the push block 3 to move in the horizontal direction, thereby driving the syringe piston handle fixed to the push block 3 to move, so as to realize quantitative drug administration. It is suitable for syringes of different specifications, improves the utilization rate of the device, and reduces the possibility that the piston handle is not fixed to the push block 3 and thus affects the drug administration.

[0035] like Figure 7 The fixing component 4 includes an A connecting plate 401 and a B connecting plate 402, which are fixed to the side of the push block 3 facing the syringe and are arranged coaxially. The A connecting plate 401 and the B connecting plate 402 are fixed by evenly arranged guide rods 403. The A connecting plate 401 is fixed to the push block 3, and the B connecting plate 402 is close to the syringe piston handle. Several top plates 404 are hinged to the A connecting plate 401. The top plates 404 are arranged in a linear array with the center of the A connecting plate 401 as the center. The B connecting plate 402 has a movable groove 405 that is adapted to the top plate 404. The end of the top plate 404 away from the A connecting plate 401 is set in the movable groove 405 and is movably connected to the movable groove 405. The push block 3 is provided with a control component to control the rotation of the top plate 404 so as to lock and fix it with the syringe piston handle. The top plate 404 has an anti-slip groove on the recessed side facing the piston handle.

[0036] like Figure 7 In the initial state, the B connecting plate 402 extends into the middle recess of the syringe piston rod. Power is provided by the control component to drive several top plates 404 to rotate around the center of the A connecting plate 401. The top plates 404 rotate and abut against the middle recess of the syringe piston rod, so that the top plates 404 and the syringe piston rod are locked and fixed, thereby realizing the fixed connection between the push block 3 and the syringe piston handle.

[0037] like Figure 7The control component includes a screw 406 that passes through and is rotatably connected to the push block 3. One end of the screw 406 that extends out of the push block 3 is coaxially fixed with a handle, and the other end that extends out of the push block 3 passes through and is rotatably connected to the A connecting plate 401. One end of the screw 406 that extends out of the A connecting plate 401 is rotatably connected to the B connecting plate 402. An A support block 407 and a B support block 408 are sleeved on the screw 406 and located between the A connecting plate 401 and the B connecting plate 402. The diameter of the A support block 407 is smaller than the diameter of the B support block 408. Both the A support block 407 and the B support block 408 are threadedly connected to the screw 406. Both the A support block 407 and the B support block 408 are sleeved outside the guide rod 403 and are slidably connected to the guide rod 403.

[0038] like Figure 7 Power is provided by manually rotating the handle, which drives the screw 406, which is fixed coaxially with the handle, to rotate. The rotation of the screw 406 will drive the movement of support block A 407 and support block B 408. The guide rod 403 guides and limits the movement of support block A 407 and support block B 408. The movement of support block A 407 and support block B 408 will drive the top plate 404, which is in contact with support block A 407 and support block B 408, to rotate.

[0039] like Figure 7 Both sides of the top plate 404 are integrated with extension plates 409, and the ends of the movable groove 405 are integrated with dead stops that are adapted to the extension plates 409. Through the cooperation of the extension plates 409 and the dead stops, the top plate 404 will not come off the B connecting plate 402 under the action of gravity or pressure.

[0040] like Figure 3 and Figure 4 The movable component 5 includes two opposing supports 501 fixed in the inner cavity of the housing 1. A lead screw 502 is rotatably connected between the two supports 501. A movable block 503 threadedly connected to the lead screw 502 is sleeved on the lead screw 502. A guide rod 504 located next to the lead screw 502 is also fixed between the two supports 501. The movable block 503 is sleeved on the guide rod 504 and slidably connected to the guide rod 504. A sleeve 505 is also fixed on the movable block 503. One end of the sleeve 505 away from the movable block 503 extends out of the adjacent support 501 and is slidably connected to the support 501. One end of the sleeve 505 extending out of the support 501 is fixed to the push block 3. A motor that drives the lead screw 502 to rotate is fixed on the other support 501.

[0041] like Figure 3 and Figure 4Power is provided by a motor, which drives the lead screw 502, which is coaxially fixed with the output shaft of the motor, to rotate. The rotation of the lead screw 502 will drive the moving block 503, which is threadedly connected to the lead screw 502, to move. The guide rod 504 guides the movement of the moving block 503. The movement of the moving block 503 will drive the sleeve 505, which is fixed to the moving block 503, to move. The support 501 guides the movement of the sleeve 505. The movement of the sleeve 505 will drive the push block 3, which is fixed to the sleeve 505, to move.

[0042] like Figure 3 and Figure 4 and Figure 5 and Figure 6 The push block 3 is also provided with two opposing clamping plates 6 on the side facing the syringe. The clamping plates 6 are integrated with short shafts 7. The short shafts 7 pass through the inner cavity of the push block 3 and are rotatably connected to the push block 3. The inner cavity of the push block 3 is provided with a drive assembly that controls the rotation of the clamping plates 6 to clamp the syringe piston handle. The drive assembly provides power to drive the two short shafts 7 to rotate relative to each other. The rotation of the two short shafts 7 will drive the clamping plates 6, which are fixed coaxially with the short shafts 7, to rotate, thereby clamping the syringe piston handle and further fixing the syringe.

[0043] like Figure 3 and Figure 4 and Figure 5 and Figure 6 The drive assembly includes a rotating block 8 disposed in the inner cavity of the push block 3. The rotating block 8 is rotatably connected to the push block 3. A drive groove 9 runs through the interior of the rotating block 8. An internal gear 10 is integrally mounted on the rotating block 8 and located in the drive groove 9. A gear 11 and B gear 12 are also disposed in the drive groove 9 and mesh with each other. A gear 11 meshes with the internal gear 10, while B gear 12 does not contact the internal gear 10. Both A gear 11 and B gear 12 are rotatably connected to the inner cavity of the push block 3. The portion of the short shaft 7 that passes through the inner cavity of the push block 3 is coaxially fixed with A gear 11 and B gear 12, respectively. A rocker arm 13 is also rotatably connected to the inner cavity of the push block 3. The end of the rocker arm 13 away from the push block 3 is movably connected to the rotating block 8 through a tension spring 14. The push block 3 is provided with a power assembly for controlling the rotation of the rotating block 8. The rotation of the rotating block 8 does not affect the screw 406.

[0044] like Figure 3 and Figure 4 and Figure 5 and Figure 6 Power is provided by the power assembly, which drives the rotating block 8 to rotate. The rotation of the rotating block 8 will drive the internal gear 10, which is integrated with the rotating block 8, to rotate. The rotation of the internal gear 10 will drive the A gear 11, which meshes with the internal gear 10, to rotate. The rotation of the A gear 11 will drive the B gear 12, which meshes with the A gear 11, to rotate. This will drive the short shaft 7, which is fixed to the A gear 11 and the B gear 12, to rotate. This will drive the clamping plate 6, which is fixed to the short shaft 7, to rotate, thereby controlling the clamping or releasing of the syringe piston handle.

[0045] like Figure 3 and Figure 4 and Figure 5 and Figure 6 The power assembly includes a connecting rod 15 that passes through the sleeve 505. One end of the connecting rod 15 is rotatably connected to the moving block 503 and the sleeve 505, and the other end enters the inner cavity of the push block 3 and is rotatably connected to the push block 3. The connecting rod 15 that enters the inner cavity of the push block 3 passes through the rotating block 8 and is clamped and fixed to the rotating block 8. The center line of the connecting rod 15 is arranged coaxially with the center of the rotating block 8. The connecting rod 15 passes through the rotating block 8 and exits the push block 3. The part of the connecting rod 15 that exits the push block 3 is fixed with a movable handle 16. A fixed handle 17 located next to the movable handle 16 and cooperating with the movable handle 16 is also fixed on the push block 3.

[0046] like Figure 3 and Figure 4 and Figure 5 and Figure 6 By manually rotating the movable handle 16, the connecting rod 15 and the rotating block 8 fixed to the movable handle 16 are rotated. The rotation of the rotating block 8 will drive the internal gear 10, which is integrated with the rotating block 8, to rotate. The rotation of the internal gear 10 will drive the A gear 11, which meshes with the internal gear 10, to rotate. The rotation of the A gear 11 will drive the B gear 12, which meshes with the A gear 11, to rotate, thereby driving the rotation of the two clamping plates 6.

[0047] When in use, connect the power supply and turn on the switch. The operator grasps the clamping rod 19 and pulls it outward. After manually rotating the clamping rod 19 without affecting the installation of the syringe, the operator grasps the movable handle 16 and the fixed handle 17 and manually rotates the movable handle 16. The rotation of the movable handle 16 will drive the connecting rod 15 fixed to the movable handle 16 to rotate. The rotation of the connecting rod 15 will drive the rotating block 8 fixed to the connecting rod 15 to rotate. The rotation of the rotating block 8 will drive the internal gear 10 integrated with the rotating block 8 to rotate. The rotation of the internal gear 10 will drive the A gear 11 meshing with the internal gear 10 to rotate. The rotation of the A gear 11 will drive the B gear 12 meshing with the A gear 11 to rotate. The rotation of the A gear 11 and the B gear 12 will drive the two short shafts 7 fixed to the A gear 11 and the B gear 12 to rotate. The rotation of the short shafts 7 will drive the clamping plate 6 fixed to the short shafts 7 to rotate. The two clamping plates 6 rotate towards each other.

[0048] At this time, the staff puts the syringe into the groove 2, the piston handle of the syringe is inserted between the two clamping plates 6 and the push block 3, the B connecting plate 402 extends into the middle recess of the syringe piston rod, and the handle of the syringe shell is inserted into the slot 20.

[0049] Grasp the clamping rod 19 again and pull it outwards again. Manually rotate the clamping rod 19 so that it reverses to the appropriate position. Then release the clamping rod 19. The clamping rod 19 will rotate and clamp the syringe.

[0050] After releasing the movable handle 16, the tension spring 14 rebounds, causing the rotating block 8 connected to the tension spring 14 to rotate, which in turn causes the A gear 11 to rotate in the opposite direction, thereby causing the two clamping plates 6 to rotate in opposite directions and clamp the piston handle. Then, grasp the handle and manually rotate the handle. The rotation of the handle will cause the screw 406, which is fixed coaxially with the handle, to rotate. The rotation of the screw 406 will cause the A support block 407 and the B support block 408 to move on the guide rod 403. The movement of the A support block 407 and the B support block 408 will cause the top plate 404, which is in contact with the A support block 407 and the B support block 408, to rotate. The top plate 404 rotates and is locked in place at the middle recess of the syringe piston handle. This is suitable for syringes of different sizes and improves the stability of the device.

[0051] Then, the motor is turned on, providing power to rotate the lead screw 502, which is coaxially fixed to the motor output shaft. The rotation of the lead screw 502 will cause the moving block 503, which is threadedly connected to the lead screw 502, to move. The guide rod 504 guides the movement of the moving block 503. The movement of the moving block 503 will cause the sleeve 505, which is fixed to the moving block 503, to move. The support 501 guides the movement of the sleeve 505. The movement of the sleeve 505 will cause the push block 3, which is fixed to the sleeve 505, to move, which in turn causes the syringe piston handle, which is fixed to the push block 3, to move, thus realizing drug delivery.

[0052] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. A push-pull clamping mechanism for an injection pump, characterized in that, Includes a housing (1), on which two grooves (2) are provided to accommodate syringes, and a push block (3) is provided on the side of the grooves (2) to abut against the piston handle of the syringe. The push block (3) is provided with a fixing component (4) extending into the piston handle of the syringe and fixedly connected to the piston handle of the syringe. The push block (3) is connected to the housing (1) through a moving component (5). The fixing assembly (4) includes an A connecting plate (401) and a B connecting plate (402) fixed to the side of the push block (3) facing the syringe and arranged coaxially. The A connecting plate (401) and the B connecting plate (402) are fixed by evenly arranged guide rods (403). The A connecting plate (401) is fixed to the push block (3), and the B connecting plate (402) is close to the syringe piston handle. Several top plates (404) are hinged to the A connecting plate (401). The top plate (404) is arranged in a linear array with the center of the connecting plate A (401) as the center. The connecting plate B (402) is provided with a movable groove (405) that is adapted to the top plate (404). The end of the top plate (404) away from the connecting plate A (401) is located in the movable groove (405) and is movably connected to the movable groove (405). The push block (3) is provided with a control component to control the rotation of the top plate (404) so ​​as to lock and fix it with the syringe piston handle.

2. The push-pull clamping mechanism for an injection pump according to claim 1, characterized in that, The control component includes a screw (406) that passes through and is rotatably connected to the push block (3). One end of the screw (406) that extends out of the push block (3) is coaxially fixed with a handle, and the other end that extends out of the push block (3) passes through and is rotatably connected to the A connecting plate (401). One end of the screw (406) that extends out of the A connecting plate (401) is rotatably connected to the B connecting plate (402). A handle located at A is sleeved on the screw (406). A support block (407) and B support block (408) are located between connecting plate (401) and connecting plate (402). The diameter of the A support block (407) is smaller than the diameter of the B support block (408). The A support block (407) and the B support block (408) are both threadedly connected to the screw (406). The A support block (407) and the B support block (408) are both sleeved on the guide rod (403) and slidably connected to the guide rod (403).

3. The push-pull clamping mechanism for an injection pump according to claim 1, characterized in that, Both sides of the top plate (404) are integrally provided with extension plates (409), and the ends of the movable groove (405) are integrally provided with dead stops that are adapted to the extension plates (409).

4. The push-pull clamping mechanism for an injection pump according to claim 1, characterized in that, The movable component (5) includes two opposing supports (501) fixed in the inner cavity of the housing (1). A lead screw (502) is rotatably connected between the two supports (501). A movable block (503) threadedly connected to the lead screw (502) is sleeved on the lead screw (502). A guide rod (504) located beside the lead screw (502) is also fixed between the two supports (501). The movable block (503) is sleeved on the guide rod (504). Outside of 504) and slidably connected to the guide rod (504), the moving block (503) is also fixed with a sleeve (505), one end of the sleeve (505) away from the moving block (503) passes through the adjacent support (501) and is slidably connected to the support (501), one end of the sleeve (505) passing through the support (501) is fixed to the push block (3), and another support (501) is fixed with a motor that drives the lead screw (502) to rotate.

5. The push-pull clamping mechanism for an injection pump according to claim 1, characterized in that, The push block (3) is also provided with two opposing clamping plates (6) on the side facing the syringe. A short shaft (7) is integrally formed on the clamping plate (6). The short shaft (7) passes through the inner cavity of the push block (3) and is rotatably connected to the push block (3). The inner cavity of the push block (3) is provided with a drive assembly for controlling the rotation of the clamping plate (6) to clamp the syringe piston handle.

6. The push-pull clamping mechanism for an injection pump according to claim 5, characterized in that, The drive assembly includes a rotating block (8) disposed in the inner cavity of the push block (3). A drive groove (9) runs through the inside of the rotating block (8). An internal gear (10) is integrally mounted on the rotating block (8) and located in the drive groove (9). A gear (11) and B gear (12) mesh with each other in the drive groove (9). The A gear (11) meshes with the internal gear (10), and the B gear (12) does not contact the internal gear (10). Both the A gear (11) and the B gear (12) are rotatably connected to the inner cavity of the push block (3). The part of the short shaft (7) that passes through the inner cavity of the push block (3) is coaxially fixed with the A gear (11) and the B gear (12) respectively. The inner cavity of the push block (3) is also rotatably connected to a swing rod (13). The end of the swing rod (13) away from the push block (3) is movably connected to the rotating block (8) through a tension spring (14). The push block (3) is provided with a power component to control the rotation of the rotating block (8).

7. The push-pull clamping mechanism for an injection pump according to claim 6, characterized in that, The power assembly includes a connecting rod (15) that passes through the sleeve (505). One end of the connecting rod (15) is rotatably connected to the moving block (503), and the other end enters the inner cavity of the push block (3) and is rotatably connected to the push block (3). The connecting rod (15) that enters the inner cavity of the push block (3) passes through the rotating block (8) and is clamped and fixed to the rotating block (8). The center line of the connecting rod (15) is coaxially arranged with the center of the rotating block (8). The connecting rod (15) passes through the rotating block (8) and exits the push block (3). The part of the connecting rod (15) that exits the push block (3) is fixed with a movable handle (16). The push block (3) is also fixed with a fixed handle (17) located next to the movable handle (16) and cooperating with the movable handle (16).

Images