A pumping drive mechanism for a split syringe pump

Abstract

This invention discloses a pumping drive mechanism for a split-type injection pump, relating to the field of injection pump technology. It includes: a base plate; a gearbox mounted on the base plate; multiple transmission screws rotatably connected to both sides of the gearbox at both ends, the screws being parallel to each other and each equipped with a worm gear; a transmission shaft connected to the side walls of the gearbox at both ends, with multiple worm gears mounted on the shaft; multiple moving blocks, each equipped with a push rod, the end of which extends away from the moving block and connects to a push plate; a clamping plate mounted on the base plate; and a servo motor connected to the transmission shaft. This invention, by setting multiple transmission screws with different pitches, can drive the moving blocks to rotate at various speeds, achieving adjustable pumping speed during use. Through the use of worm gear and helical transmission, high-precision pumping can be achieved.

Description

Technical Field

[0001] This invention relates to the field of syringe pump technology, and more specifically to a pumping drive mechanism for a split-type syringe pump. Background Technology

[0002] A split-type syringe pump is a precision liquid delivery device that connects the control terminal and the pump's pumping drive mechanism via a cable. The operation is completed on the controller, while the pump's pumping drive mechanism operates independently. It offers flexible installation and is commonly used in laboratory micro-drug administration, microfluidics, and precision chemical dispensing scenarios. Compared to integrated pumps, it is more suitable for special environments and multiple precise infusion needs.

[0003] In the existing technology, if it is necessary to adjust the speed of the liquid medicine, it is necessary to operate on the controller repeatedly. If necessary, it is also necessary to replace the pumping drive mechanism of different injection pumps to drive the liquid medicine. The operation speed is slow and it is time-consuming and laborious to use.

[0004] Therefore, how to provide a pumping drive mechanism for a split-type injection pump that can adjust the driving speed of the injection pump during use and ensure the accuracy of drug delivery is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a pumping drive mechanism for a split-type injection pump, which aims to solve the problems in the background art mentioned above, so as to realize the adjustment of the driving speed of the injection pump during use and ensure the accuracy of drug administration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A pumping drive mechanism for a split-type syringe pump includes: Base plate; A gearbox, which is mounted on the base plate; A transmission screw, the two ends of which are rotatably connected to both sides of the gearbox, and multiple transmission screws are provided, the multiple transmission screws being parallel to each other, and each of the multiple transmission screws being provided with a worm gear; A drive shaft, the two ends of which are rotatably connected to the side wall of the gearbox, the drive shaft being perpendicular to the plurality of drive screws, and the drive shaft being provided with a plurality of worm gears, each of which is correspondingly and connected to the worm wheel for transmission. The movable block is provided in multiple ways, and each of the multiple movable blocks is helically connected to the transmission screw. A push rod is provided on the movable block, and the end of the push rod away from the movable block extends out of the gearbox and is fixedly connected to a push plate. The push plate slides on the base plate. A clamping plate is disposed on the base plate and parallel to the push plate, and the clamping plate is used to clamp the syringe; A servo motor is disposed inside the gearbox and is connected to the drive shaft for transmission. The movable block includes two sleeves, a horizontal plate, a hinge nut, and a pressing rod. The two sleeves are sleeved on the transmission screw and slide on the transmission screw. The two ends of the horizontal plate are fixedly connected to the two sleeves respectively. The hinge nut is disposed between the two sleeves and is connected to the transmission screw. One end of the pressing rod is connected to the outer wall of the hinge nut, and the other end of the pressing rod passes through the horizontal plate.

[0007] Furthermore, two side plates are provided between the two movable blocks, and the two side plates are respectively provided on both sides of the lower pressure rod. The two side plates are provided with wire holes, and the lower pressure rod is provided with limit holes. A steel wire is provided in the wire holes, and the two ends of the steel wire are respectively fixedly connected to the two side walls of the gearbox. The steel wire passes through the wire holes on the side plates of the multiple movable blocks and the limit holes on the lower pressure rod in sequence.

[0008] Furthermore, a vertical sliding rod is provided at the top of the opening and closing nut, and a vertical sliding hole is provided on the horizontal plate corresponding to the position of the vertical sliding rod, and the vertical sliding rod is slidably connected to the vertical sliding hole.

[0009] Furthermore, a spring is fitted onto the vertical sliding rod, with one end of the spring abutting against the bottom of the horizontal plate and the other end of the spring abutting against the opening and closing nut.

[0010] Furthermore, a pressure plate is provided at the end of the push plate away from the push rod. The bottom of the pressure plate is connected to the push plate through a connecting plate, and the top of the pressure plate abuts against the top of the push plate. A slot is provided on the pressure plate.

[0011] Furthermore, the clamping plate includes an inner plate, an outer plate, and a movable plate. The outer plate is disposed on the edge of the base plate away from the base plate. The sidewall of the movable plate is attached to and slidably connected to the inner plate. Both ends of the movable plate are provided with extension plates, and pressure plates are provided on the extension plates. The pressure plates are perpendicular to the movable plate. A threaded hole is provided through the outer plate, and a threaded rod is provided through the threaded hole. Both ends of the threaded rod pass through the pressure plates on both sides of the movable plate. Two extrusion plates are provided on the threaded rod. The two extrusion plates are respectively disposed on the side of the two pressure plates away from the movable plate and abut against the movable plate. Both ends of the threaded rod are provided with rotating handles. The inner plate is disposed on the side of the outer plate near the gearbox. The inner plate and the outer plate are spaced apart. Multiple axial grooves are provided on the inner plate, the movable plate, and the outer plate. The axial grooves on the inner plate, the movable plate, and the outer plate are correspondingly provided.

[0012] Furthermore, both the inner plate and the outer plate are provided with rope grooves in their middle portions, and elastic ropes are provided in the rope grooves, with the elastic ropes surrounding the inner plate and the outer plate in the circumferential direction.

[0013] Furthermore, the pressing rod is provided with a first magnetic block and a second magnetic block.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a pumping drive mechanism for a split-type injection pump. By setting a worm gear on the transmission shaft to drive the worm wheel to rotate, the rotation of the worm wheel can drive the moving block to move on the transmission screw. By setting multiple worm wheels, multiple worms, multiple transmission screws, and multiple moving blocks, with each transmission screw having a different pitch, it is possible to drive the moving block to rotate at multiple different speeds. In use, the corresponding moving block and transmission screw can be controlled to cooperate. When it is necessary to adjust the pumping speed of this drive mechanism, different transmission screws can be used to drive different moving blocks to achieve the technical effect of adjusting the driving speed of the injection pump. By setting worm gear transmission and screw transmission, high-precision pumping can be achieved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 An overall structural diagram of the pumping drive mechanism of a split-type injection pump provided by the present invention; Figure 2A diagram showing the internal structure of the gearbox of a split-type injection pump's pumping drive mechanism provided by the present invention. Figure 3 A structural diagram of the moving block and transmission screw of the pumping drive mechanism of a split-type injection pump provided by the present invention; Figure 4 The internal structure diagram of the moving block when the lower pressure rod of the pumping drive mechanism of the split-type injection pump provided by the present invention moves upward; Figure 5 The internal structure diagram of the moving block when the pressure rod of the pumping drive mechanism of the split-type injection pump provided by the present invention moves downward; Figure 6 The diagram shows the steel wire structure of the pumping drive mechanism of a split-type injection pump provided by the present invention.

[0017] Wherein: 1 is the base plate; 2 is the gearbox; 3 is the transmission screw; 4 is the worm gear; 5 is the transmission shaft; 6 is the worm; 7 is the moving block; 701 is the sleeve; 702 is the horizontal plate; 703 is the opening and closing nut; 704 is the lower pressure rod; 8 is the push rod; 9 is the push plate; 10 is the clamping plate; 1001 is the inner plate; 1002 is the outer plate; 1003 is the moving plate; 11 is the servo motor; 12 is the side plate; 13 is the wire hole; 14 is the limiting hole; 15 is the steel wire; 16 is the vertical sliding rod; 17 is the vertical sliding hole; 18 is the spring; 19 is the pressure plate; 20 is the slot; 21 is the extension plate; 22 is the pressure plate; 23 is the threaded rod; 24 is the extrusion plate; 25 is the rotating handle; 26 is the axial groove; 27 is the elastic rope; 28 is the first magnetic block; 29 is the second magnetic block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figure 1-6 This invention discloses a pumping drive mechanism for a split-type syringe pump, comprising: Base plate 1; In this embodiment, the base plate 1 is a long rectangular plate structure. The top of the base plate 1 is fixedly connected to the bottom of the gearbox 2. The gearbox 2 is installed on one side of the base plate 1 and is sealed to the base plate 1.

[0020] Gearbox 2 is mounted on base plate 1. In this embodiment, a top cover is provided on the top of gearbox 2. A sliding groove is provided on the top cover corresponding to the position of the lower pressure rod 704. Multiple sliding grooves are provided. When the sliding block 7 slides, the lower pressure rod 704 slides with the sliding block 7. In use, lubricating liquid can be filled into gearbox 2 to immerse the worm gear 4, worm 6 and transmission screw 3 to ensure the lubrication of the parts inside gearbox 2.

[0021] The transmission screw 3 has two ends that are rotatably connected to the two sides of the gearbox 2. Multiple transmission screws 3 are provided, and they are parallel to each other. Each transmission screw 3 is equipped with a worm gear 4. In this embodiment, bearings are fitted at both ends of the transmission screw 3, and the outer walls of the bearings are connected to the side walls of the gearbox 2. The axis of the transmission screw 3 is parallel to the length direction of the base plate 1. There are seven transmission screws 3, each with a different pitch. In use, seven different speeds can be used to drive the corresponding moving block 7, thereby adjusting the moving speed of the push plate 9 and enabling the pumping of liquid medicine at multiple speeds. The worm gear 4 is fitted onto the transmission screw 3 and rotates synchronously with it.

[0022] The transmission shaft 5 has two ends that are rotatably connected to the side wall of the gearbox 2. The transmission shaft 5 is perpendicular to multiple transmission screws 3. Multiple worm gears 6 are provided on the transmission shaft 5, and the multiple worm gears 6 are correspondingly and connected to the worm wheels 4. In this embodiment, by providing seven worm gears 6 on the transmission shaft 5, the seven worm gears 6 drive the worm wheels 4 on the seven transmission screws 3 respectively. In use, the transmission shaft 5 drives the multiple transmission screws 3 to rotate synchronously at the same angular velocity.

[0023] Multiple movable blocks 7 are provided, and each movable block 7 is screwed and connected to the transmission screw 3. Each movable block 7 is equipped with a push rod 8, the end of which extends out of the gearbox 2 and is fixedly connected to a push plate 9, which slides on the base plate 1. Each movable block 7 includes two sleeves 701, a horizontal plate 702, a nut 703, and a pressing rod 704. The two sleeves 701 are fitted onto the transmission screw 3 and slide on it. Both ends of the horizontal plate 702 are fixedly connected to the two sleeves 701. The nut 703 is positioned between the two sleeves 701 and is connected to the transmission screw 3. The pressing rod 704... One end of the rod 704 is connected to the outer wall of the opening / closing nut 703, and the other end of the pressing rod 704 passes through the horizontal plate 702; a first magnetic block 28 and a second magnetic block 29 are provided on the pressing rod 704; in this embodiment, by pressing down the pressing rod 704, the opening / closing nut 703 can be pressed down, thereby pressing the opening / closing nut 703 onto the transmission screw 3. The opening / closing nut 703 and the nut of the transmission screw 3 are the same and can be connected for transmission. Therefore, when the opening / closing nut 703 is pressed onto the transmission screw 3, the rotation of the transmission screw 3 can drive the opening / closing nut 703, the two sleeves 701, the pressing rod 704 and the push rod 8 towards the direction of the opening / closing nut 703, the two sleeves 701, the pressing rod 704 and the push rod 8. Moving the syringe towards or away from the push plate 9 allows the opening and closing nut 703 and the transmission screw 3 to be separated by pulling the downward pressure rod 704 upward. This disconnects the transmission relationship between the transmission screw 3 and the moving block 7. Pressing down other downward pressure rods 704 and the transmission nut allows for speed switching of the push plate 9, enabling the syringe to be driven at multiple speeds. The inner diameter of the sleeve 701 is the same as the major diameter of the thread of the transmission screw 3, allowing the sleeve 701 to slide on the transmission screw 3. During use, multiple moving blocks 7 move synchronously with the moving blocks 7 that cooperate with the transmission screw 3. The first magnetic block 28 is set on the second magnetic block. Above block 29, during use, the horizontal plate 702 is made of metal and can be attracted by a magnet. When the opening and closing nut 703 and the transmission screw 3 are fully engaged, the first magnetic block 28 is attracted to the inner wall of the horizontal plate 702 through which the pressure rod 704 passes. When the opening and closing nut 703 is completely separated from the transmission screw 3, the second magnetic block 29 is attracted to the inner wall of the horizontal plate 702 through which the pressure rod 704 passes. By setting the first magnetic block 28 and the second magnetic block 29, it is possible to prevent the pressure rod 704 from detaching from the transmission screw 3 or from slightly engaging with the transmission screw 3 without external force, thus ensuring that the transmission pressure rod 704 and the opening and closing nut 703 are not damaged.

[0024] A clamping plate 10 is disposed on the base plate 1 and parallel to the push plate 9. The clamping plate 10 is used to clamp the syringe. In this embodiment, the clamping plate 10 can clamp the syringe wall or the anti-slip wing. The push plate 9 can fix the syringe press head, thereby controlling the push rod 8 to drive the syringe piston forward or backward, thereby realizing the extraction of the drug liquid.

[0025] The servo motor 11 is installed inside the gearbox 2 and is connected to the transmission shaft 5. In this embodiment, the speed of the transmission shaft 5, worm gear 4, worm 6, transmission screw 3, moving block 7, push rod 8 and push plate 9 can be controlled in real time by setting the servo motor 11, thereby effectively controlling the pumping speed and realizing high-precision pumping of the medicine.

[0026] Two side plates 12 are provided between the two movable blocks 7, and the side plates 12 are respectively located on both sides of the lower pressure rod 704. Each side plate 12 has a wire hole 13, and the lower pressure rod 704 has a limit hole 14. A steel wire 15 is installed in the wire hole 13, and both ends of the steel wire 15 are fixedly connected to the two side walls of the gearbox 2. The steel wire 15 passes sequentially through the wire holes 13 on the side plates 12 of the movable blocks 7 and the limit holes 14 on the lower pressure rod 704. In this embodiment, by providing the side plates 12 and the steel wire 15, during use, the wire holes 13 on the movable blocks 7... The height of all three remains unchanged. The length of the steel wire 15 is only enough for one pressing rod 704 to slide downwards. When other pressing rods 704 are pressed down and slid downwards, the steel wire 15, except for the position of the pressing rod 704, will become straight. This can drive the pressing rod 704 above the opening and closing nut 703, which is already in the transmission state, upwards. This can disconnect the transmission between the opening and closing nut 703 and the transmission screw 3, thereby preventing multiple opening and closing nuts 703 from being connected to the corresponding transmission screw 3 during use, and thus preventing damage to the opening and closing nut 703 and the transmission screw 3.

[0027] A vertical sliding rod 16 is provided on the top of the opening and closing nut 703, and a vertical sliding hole 17 is provided on the horizontal plate 702 at the position corresponding to the vertical sliding rod 16. The vertical sliding rod 16 is slidably connected to the vertical sliding hole 17. A spring 18 is sleeved on the vertical sliding rod 16. One end of the spring 18 abuts against the bottom of the horizontal plate 702, and the other end of the spring 18 abuts against the opening and closing nut 703. In this embodiment, two vertical sliding rods 16 are provided on each opening and closing nut 703. By providing the vertical sliding rods 16, it can be ensured that the opening and closing nut 703 always slides vertically, which can prevent the pressure rod 704 and the opening and closing nut 703 from shaking. By providing the spring 18, when the opening and closing nut 703 is engaged with the transmission screw 3, the opening and closing nut 703 can be pressed onto the transmission screw 3, which can effectively prevent the opening and closing nut 703 and the transmission screw 3 from separating.

[0028] A pressure plate 19 is provided at the end of the push plate 9 away from the push rod 8. The bottom of the pressure plate 19 is connected to the push plate 9 through a connecting plate, and the top of the pressure plate 19 abuts against the top of the push plate 9. A slot 20 is provided on the pressure plate 19. In this embodiment, the top of the pressure plate 19 is provided with a plate-like structure that is inclined away from the push plate 9. In use, the piston rod of the syringe can be placed in the slot 20, and the push plate 9 and the pressure plate 19 can clamp the pressing head on the piston rod, thereby driving the piston rod of the syringe.

[0029] The clamping plate 10 includes an inner plate, an outer plate 1002, and a movable plate 1003. The outer plate 1002 is located on the edge of the base plate 1 away from the base plate 1. The sidewall of the movable plate 1003 is attached to and slidably connected to the inner plate. Both ends of the movable plate 1003 are provided with extension plates 21, and pressure plates 22 are provided on the extension plates 21. The pressure plates 22 are perpendicular to the movable plate 1003. A threaded hole is provided through the outer plate 1002, and a threaded rod 23 is provided through the threaded hole. Both ends of the threaded rod 23 pass through the pressure plates 22 on both sides of the movable plate 1003. Two pressing plates 24 are provided on the threaded rod 23. The two pressing plates 24 are respectively located on the side of the two pressure plates 22 away from the movable plate 1003 and abut against the movable plate 1003. Both ends of the threaded rod 23 are provided with rotating handles 25. The inner plate is located on the side of the outer plate 1002 near the gearbox 2. The inner plate and the outer plate 1003 are connected. 2. Spacing arrangement: Multiple axial grooves 26 are provided on the inner plate, the moving plate 1003, and the outer plate 1002. The axial grooves 26 on the inner plate, the moving plate 1003, and the outer plate 1002 are correspondingly arranged. In this embodiment, the moving plate 1003 is arranged between the inner plate and the outer plate 1002. The side walls of the moving plate 1003 and the outer plate 1002 are in contact. The moving plate 1003 and the inner plate are spaced apart. This space is used to place the anti-slip wings of the syringe. In use, by rotating the rotating handles 25 on both sides, the rotating handles 25, the squeezing plate 24, and the threaded rod 23 rotate and move synchronously. Then, the squeezing plate 24 can drive the pressure plate 22. During the movement of the moving plate 1003, the axial grooves 26 between the moving plate 1003 and the inner plate and the outer plate 1002 will be misaligned, thereby clamping the piston cylinder on the syringe and effectively fixing the syringe.

[0030] Both the inner plate and the outer plate 1002 are provided with rope grooves in the middle, and elastic ropes 27 are provided in the rope grooves. The elastic ropes 27 surround the inner plate and the outer plate 1002 in the circumferential direction. In this embodiment, the rope grooves are used to bind the inner plate and the outer plate 1002, and can also bind the syringe to prevent the syringe from falling off the clamping plate 10, which is convenient for use.

[0031] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pumping drive mechanism for a split-type syringe pump, characterized in that, include: Base plate; A gearbox, the gearbox being mounted on the base plate; A transmission screw, the two ends of which are rotatably connected to both sides of the gearbox, and multiple transmission screws are provided, the multiple transmission screws being parallel to each other, and each of the multiple transmission screws being provided with a worm gear; A drive shaft, the two ends of which are rotatably connected to the side wall of the gearbox, the drive shaft being perpendicular to the plurality of drive screws, and the drive shaft being provided with a plurality of worm gears, each of which is correspondingly and connected to the worm wheel for transmission. The movable block is provided in multiple ways, and each of the multiple movable blocks is helically connected to the transmission screw. A push rod is provided on the movable block, and the end of the push rod away from the movable block extends out of the gearbox and is fixedly connected to a push plate. The push plate slides on the base plate. A clamping plate is disposed on the base plate and parallel to the push plate, and the clamping plate is used to clamp the syringe; A servo motor is disposed inside the gearbox and is connected to the drive shaft for transmission. The movable block includes two sleeves, a horizontal plate, a hinge nut, and a pressing rod. The two sleeves are sleeved on the transmission screw and slide on the transmission screw. The two ends of the horizontal plate are fixedly connected to the two sleeves respectively. The hinge nut is disposed between the two sleeves and is connected to the transmission screw. One end of the pressing rod is connected to the outer wall of the hinge nut, and the other end of the pressing rod passes through the horizontal plate.

2. A pumping drive mechanism for a split-body syringe pump according to claim 1, wherein, Two side plates are provided between the two movable blocks. The two side plates are respectively provided on both sides of the lower pressure rod. The two side plates are provided with wire holes. The lower pressure rod is provided with limit holes. A steel wire is provided in the wire holes. The two ends of the steel wire are respectively fixedly connected to the two side walls of the gearbox. The steel wire passes through the wire holes on the side plates of the multiple movable blocks and the limit holes on the lower pressure rod in sequence.

3. The pumping drive mechanism of a split-type injection pump according to claim 1, characterized in that, The top of the opening and closing nut is provided with a vertical sliding rod, and the horizontal plate is provided with a vertical sliding hole corresponding to the position of the vertical sliding rod, and the vertical sliding rod is slidably connected to the vertical sliding hole.

4. The pumping drive mechanism of a split-type injection pump according to claim 3, characterized in that, A spring is fitted onto the vertical sliding rod, with one end of the spring abutting against the bottom of the horizontal plate and the other end of the spring abutting against the opening and closing nut.

5. The pumping drive mechanism of a split-type injection pump according to claim 1, characterized in that, A pressure plate is provided at the end of the push plate away from the push rod. The bottom of the pressure plate is connected to the push plate through a connecting plate, and the top of the pressure plate abuts against the top of the push plate. A slot is provided on the pressure plate.

6. The pumping drive mechanism of a split-type injection pump according to claim 1, characterized in that, The clamping plate includes an inner plate, an outer plate, and a movable plate. The outer plate is located on the edge of the base plate away from the base plate. The sidewall of the movable plate is attached to and slidably connected to the inner plate. Both ends of the movable plate are provided with extension plates, and pressure plates are provided on the extension plates. The pressure plates are perpendicular to the movable plate. A threaded hole is provided through the outer plate, and a threaded rod is provided through the threaded hole. The two ends of the threaded rod pass through the pressure plates on both sides of the movable plate. Two extrusion plates are provided on the threaded rod. The two extrusion plates are respectively located on the side of the two pressure plates away from the movable plate and abut against the movable plate. Both ends of the threaded rod are provided with rotating handles. The inner plate is located on the side of the outer plate near the gearbox. The inner plate and the outer plate are spaced apart. Multiple axial grooves are provided on the inner plate, the movable plate, and the outer plate. The axial grooves on the inner plate, the movable plate, and the outer plate are correspondingly provided.

7. The pumping drive mechanism of a split-type injection pump according to claim 6, characterized in that, Both the inner plate and the outer plate have rope grooves in their middle sections, and elastic ropes are installed in the rope grooves, with the elastic ropes wrapping around the inner plate and the outer plate in the circumferential direction.

8. The pumping drive mechanism of a split-type injection pump according to claim 1, characterized in that, The pressing rod is equipped with a first magnetic block and a second magnetic block.

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