Driving mechanism and injection pump

Abstract

The utility model belongs to the technical field of injection pumps, and particularly relates to a driving mechanism and an injection pump, the driving mechanism comprises a frame body, a first driving piece, a lead screw and a nut assembly, the first driving piece is installed on the frame body, the lead screw is rotatably assembled on the frame body, the first driving piece is used for driving the lead screw to rotate, and the nut assembly comprises a sliding block, a nut piece, a second driving piece and a pushing piece. The sliding block is assembled on the frame body and can slide in the axial direction of the lead screw, one end of the pushing piece is connected with the sliding block, the other end of the pushing piece is used for being connected with a plunger rod of an injector, the nut piece comprises a connecting part and a matching part which are connected, the connecting part is connected with the sliding block, and a matching groove is formed in the side, facing the lead screw, of the matching part; threads used for being matched with the lead screw are arranged in the matching groove, and the second driving piece is used for driving the nut piece to act so that the matching part can be clamped with or disengaged from the lead screw. The position of the sliding block can be manually adjusted, injectors of different specifications can be rapidly matched and installed, and the injection working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection pumps, and in particular relates to a driving mechanism and an injection pump. Background Art

[0002] The syringe pump is a medical device used clinically for accurate and stable drug injection. The infusion speed and total infusion volume can be set according to the patient's condition and drug type, achieving high-precision, smooth and pulsation-free drug injection.

[0003] An existing injection pump comprises a shell, a syringe and a driving mechanism, wherein the syringe and the driving mechanism are installed in the shell, the syringe comprises a tube body and a plunger rod, the tube body is fixed on the shell, the plunger rod is assembled in the tube body, the driving mechanism comprises a driving motor, a screw and a nut assembly, the nut assembly comprises a slider, a nut sleeve and a push rod, the slider is slidably assembled on the shell, the nut sleeve is connected to the slider, one end of the push rod is fixedly covered on the slider, and the other end is connected to the plunger rod, the screw rod is transmission-connected to the driving motor, and the nut sleeve is screwed on the screw rod. When the driving motor drives the screw rod to rotate, the nut sleeve drives the slider and the push rod to move, thereby causing the push rod to drive the plunger rod to move in the tube body to complete the injection or pull the plunger rod back.

[0004] In the above-mentioned injection pump, the nut sleeve is always screwed onto the screw and can only move on the screw along the axial direction of the screw. For syringes of different lengths, only by repeatedly starting the drive motor forward or reverse can the push rod be moved to a suitable position to install the syringe. This process is relatively slow and time-consuming, resulting in low efficiency of the entire injection work and affecting treatment. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a driving mechanism and a syringe pump in view of the problem that the existing syringe pump takes a long time to install the syringe.

[0006] In order to solve the above technical problems, on the one hand, the embodiment of the utility model provides a driving mechanism, including a frame, a first driving member, a screw and a nut assembly, wherein the first driving member is mounted on the frame, the screw is rotatably mounted on the frame, the first driving member is used to drive the screw to rotate, the nut assembly includes a slider, a nut member, a second driving member and a push member, the slider is mounted on the frame, the slider can slide along the axial direction of the screw, one end of the push member is connected to the slider, and the other end of the push member is used to be connected to the plunger rod of the syringe;

[0007] The nut member includes a connected connecting portion and a matching portion, the connecting portion is connected to the slider, the matching portion is provided with a matching groove on the side facing the screw rod, the matching groove is provided with a thread for matching with the screw rod, and the second driving member is used to drive the nut member to move so that the matching portion can be clamped or disengaged with the screw rod.

[0008] Optionally, the second driving member includes a connected connecting section and an elastic driving section, the connecting section is installed on the sliding block, the elastic driving section is connected to the connecting portion, and the elastic force of the elastic driving section can press the matching portion onto the screw rod.

[0009] Optionally, the connecting portion includes a connected rotating shaft section and a transition section, the transition section is connected to the matching portion, the sliding block includes a bottom plate, a first baffle plate and a second baffle plate, the first baffle plate and the second baffle plate are arranged on the bottom plate at intervals, one end of the rotating shaft section is rotatably assembled on the first baffle plate, and the other end is rotatably assembled on the second baffle plate, and the pushing member is connected to the second baffle plate;

[0010] The driving member includes a torsion spring, which is sleeved on the rotating shaft segment. One end of the torsion spring forms the connecting segment connected to the first baffle, and the other end forms the elastic driving segment connected to the matching portion. The elastic driving segment and the matching groove are arranged on opposite sides of the matching portion.

[0011] Optionally, one end of the rotating shaft segment close to the pushing member passes through the second baffle to form a handle portion, and the handle portion is used to rotate the rotating shaft segment.

[0012] Optionally, the pushing member is a pushing tube, one end of the pushing tube close to the sliding block is connected to a side of the second baffle plate facing away from the first baffle plate, and the handle portion extends from the other end of the pushing tube.

[0013] Optionally, a through hole is provided on the bottom plate, and a guide rail is provided on the frame body. The guide rail is parallel to the screw rod, and the guide rail passes through the through hole.

[0014] Optionally, a detection module is further included, wherein the detection module is installed on the frame and is used to detect the sliding distance of the slider.

[0015] Optionally, the detection module includes a travel potentiometer, the travel potentiometer is arranged below the guide rail, and the travel potentiometer is connected to the slider.

[0016] Optionally, the first driving member includes a driving motor, and the driving motor is drivingly connected to the screw rod to drive the screw rod to rotate.

[0017] According to the driving mechanism of the embodiment of the utility model, a thread is arranged on the mating groove on the mating part of the nut member, which can cooperate with the screw rod, so that the rotation of the screw rod is converted into the movement of the nut member, and the nut member drives the slider and the push member to move, so that the push member can drive the plunger rod of the syringe to move, so as to help the syringe complete the injection. The torsion spring of the second driving member can not only press the mating part against the screw rod, but also can be lifted at any time to disengage the mating part from the screw rod, so that the position of the slider can be adjusted manually, and syringes of different specifications can be quickly adapted and installed, thereby improving the injection work efficiency.

[0018] On the other hand, an embodiment of the utility model provides an injection pump, including a shell, a syringe and the above-mentioned driving mechanism, the frame is connected to the shell, the syringe includes a plunger rod and a tube body, and the end of the push member away from the slider is connected to the plunger rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a driving mechanism provided in one embodiment of the utility model;

[0020] Figure 2 A schematic diagram of a partial structure of a driving mechanism provided in one embodiment of the utility model;

[0021] Figure 3 for Figure 2 Enlarged view of point A in .

[0022] The figure marks in the specification are as follows: 1. frame; 2. first driving member; 3. driving motor; 4. driving wheel; 5. transition wheel; 6. driven wheel; 7. push member; 8. push tube; 9. matching groove; 10. nut assembly; 11. handle portion; 12. screw rod; 13. nut member; 14. connecting portion; 15. shaft section; 16. transition section; 17. matching portion; 18. second driving member; 19. torsion spring; 20. connecting section; 21. elastic driving section; 22. slider; 23. bottom plate; 24. first baffle plate; 25. second baffle plate; 26. perforation; 27. guide rail; 28. travel potentiometer. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] like Figures 1 to 3As shown, an embodiment of the utility model provides a driving mechanism, including a frame 1, a first driving member 2, a screw rod 12 and a nut assembly 10, wherein the first driving member 2 is mounted on the frame 1, and the screw rod 12 is rotatably assembled on the frame 1, and the first driving member 2 is used to drive the screw rod 12 to rotate, and the nut assembly 10 includes a slider 22, a nut member 13, a second driving member 18 and a push member 7, the slider 22 is assembled on the frame 1, and the slider 22 can slide along the axial direction of the screw rod 12, one end of the push member 7 is connected to the slider 22, and the other end of the push member 7 is used to be connected to the plunger rod of the syringe.

[0025] The nut member 13 includes a connected connecting portion 14 and a matching portion 17, wherein the connecting portion 14 is connected to the slider 22, and the matching portion 17 is provided with a matching groove 9 on the side facing the screw rod 12, and the matching groove 9 is provided with a thread for matching with the screw rod 12, and the second driving member 18 is used to drive the nut member 13 to move so that the matching portion 17 can be clamped or disengaged with the screw rod 12.

[0026] In one embodiment, the second driving member 18 includes a connecting section 20 and an elastic driving section 21, wherein the connecting section 20 is mounted on the slider 22, and the elastic driving section 21 is connected to the connecting portion 14. The elastic force of the elastic driving section 21 can press the matching portion 17 onto the screw rod 12. The matching portion 17 is driven by the elastic force to save costs.

[0027] In one embodiment, the connecting portion 14 includes a connected rotating shaft section 15 and a transition section 16, the transition section 16 is connected to the matching portion 17, the slider 22 includes a base plate 23, a first baffle 24 and a second baffle 25, the first baffle 24 and the second baffle 25 are arranged at intervals on the base plate 23, one end of the rotating shaft section 15 is rotatably assembled on the first baffle 24, and the other end is rotatably assembled on the second baffle 25, and the pushing member 7 is connected to the second baffle 25.

[0028] The driving member includes a torsion spring 19, which is sleeved on the rotating shaft section 15. One end of the torsion spring 19 forms the connecting section 20 connected to the first baffle 24, and the other end forms the elastic driving section 21 connected to the matching portion 17. The elastic driving section 21 and the matching groove 9 are arranged on opposite sides of the matching portion 17. Specifically, during normal operation, the elastic driving section 21 of the torsion spring 19 will press the matching portion 17 against the screw rod 12, so that the matching groove 9 on the nut member 13 is engaged with the screw rod 12. When the screw rod 12 rotates, the rotation of the screw rod 12 is converted into the movement of the nut member 13, and the nut member 13 drives the slider 22 and the push member 7 to move. When the syringe needs to be installed, the nut member 13 is manually lifted to separate the nut member 13 from the screw rod 12. At this time, the position of the slider 22 can be moved at will.

[0029] In one embodiment, one end of the shaft section 15 close to the pushing member 7 passes through the second baffle 25 to form a handle portion 11, and the handle portion 11 is used to rotate the shaft section 15. The handle portion 11 is convenient for rotating the nut member 13.

[0030] In one embodiment, the pushing member 7 is a pushing tube 8, and one end of the pushing tube 8 close to the sliding block 22 is connected to the side of the second baffle 25 facing away from the first baffle 24, and the handle portion 11 extends from the other end of the pushing tube 8. The pushing tube 8 is coaxially arranged with the handle portion 11 of the rotating shaft, which can reduce the overall space occupied.

[0031] In one embodiment, the bottom plate 23 is provided with a through hole 26, and the frame body 1 is provided with a guide rail 27, the guide rail 27 is parallel to the screw rod 12, and the guide rail 27 is inserted into the through hole 26. The guide rail 27 can not only guide the slider 22, but also support the slider 22 to improve the stability of the slider 22.

[0032] In one embodiment, the driving mechanism further includes a detection module, which is installed on the frame 1 and is used to detect the sliding distance of the slider 22 .

[0033] In one embodiment, the detection module includes a travel potentiometer 28, which is disposed below the guide rail 27 and connected to the slider 22. The travel potentiometer 28 can monitor the distance of the slider 22 in real time and control the travel of the slider 22.

[0034] In one embodiment, the first driving member 2 includes a driving motor 3, and the driving motor 3 is connected to the screw rod 12 to drive the screw rod 12 to rotate. The driving motor 3 is connected to the screw rod 12 through a driving wheel 4, a transition wheel 5 and a driven wheel 6. Specifically, the driving wheel 4 is connected to the output shaft of the driving motor 3, the driven wheel 6 is connected to the screw rod 12, and the transition wheel 5 is between the driving wheel 4 and the driven wheel 6.

[0035] The driving mechanism of the embodiment of the utility model works as follows:

[0036] During normal operation, the elastic driving section 21 of the torsion spring 19 will press the matching portion 17 against the screw rod 12, so that the matching groove 9 on the nut member 13 engages with the screw rod 12. When the screw rod 12 rotates, the rotation of the screw rod 12 is converted into movement of the nut member 13, and the nut member 13 drives the slider 22 and the push member 7 to move, and the push member 7 drives the plunger rod of the syringe to move.

[0037] When the syringe needs to be installed, the nut member 13 is manually lifted to separate the nut member 13 from the screw rod 12. At this time, the position of the slider 22 can be moved at will to quickly install syringes of different specifications.

[0038] According to the driving mechanism of the embodiment of the utility model, a thread is arranged on the mating groove 9 on the mating portion 17 of the nut member 13, which can cooperate with the screw rod 12, and convert the rotation of the screw rod 12 into the movement of the nut member 13. The nut member 13 drives the slider 22 and the push member 7 to move, so that the push member 7 can drive the plunger rod of the syringe to move, so as to help the syringe complete the injection. The torsion spring 19 of the second driving member 18 can not only press the mating portion 17 against the screw rod 12, but also can be lifted at any time to disengage the mating portion 17 from the screw rod 12, so that the position of the slider 22 can be adjusted manually, and syringes of different specifications can be quickly adapted and installed, thereby improving the injection work efficiency.

[0039] In other embodiments, the first driving member 2 is a wrench, which is disposed at the end of the screw rod 12 to manually rotate the screw rod 12 .

[0040] In addition, an embodiment of the utility model further provides an injection pump, including a shell, a syringe and the above-mentioned driving mechanism, the frame 1 is connected to the shell, the syringe includes a plunger rod and a tube body, and the end of the push member 7 away from the slider 22 is connected to the plunger rod.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A driving mechanism, characterized in that: It comprises a frame (1), a first driving member (2), a screw rod (12) and a nut assembly (10), wherein the first driving member (2) is mounted on the frame (1), the screw rod (12) is rotatably mounted on the frame (1), the first driving member (2) is used to drive the screw rod (12) to rotate, the nut assembly (10) comprises a slider (22), a nut member (13), a second driving member (18) and a push member (7), the slider (22) is mounted on the frame (1), the slider (22) can slide along the axial direction of the screw rod (12), one end of the push member (7) is connected to the slider (22), and the other end of the push member (7) is used to be connected to the plunger rod of the syringe; The nut member (13) comprises a connecting portion (14) and a matching portion (17) which are connected to each other. The connecting portion (14) is connected to the slider (22). A matching groove (9) is provided on a side of the matching portion (17) facing the screw rod (12). A thread for matching with the screw rod (12) is provided in the matching groove (9). The second driving member (18) is used to drive the nut member (13) to move so that the matching portion (17) can be engaged with or disengaged from the screw rod (12).

2. The driving mechanism according to claim 1, characterized in that: The second driving member (18) comprises a connected connecting section (20) and an elastic driving section (21); the connecting section (20) is mounted on the sliding block (22); the elastic driving section (21) is connected to the connecting portion (14); and the elastic force of the elastic driving section (21) can press the matching portion (17) onto the screw rod (12).

3. The driving mechanism according to claim 2, characterized in that: The connecting portion (14) comprises a connected rotating shaft section (15) and a transition section (16), wherein the transition section (16) is connected to the matching portion (17), the sliding block (22) comprises a bottom plate (23), a first baffle plate (24) and a second baffle plate (25), wherein the first baffle plate (24) and the second baffle plate (25) are arranged on the bottom plate (23) at intervals, one end of the rotating shaft section (15) is rotatably assembled on the first baffle plate (24), and the other end is rotatably assembled on the second baffle plate (25), and the pushing member (7) is connected to the second baffle plate (25); The driving member comprises a torsion spring (19), wherein the torsion spring (19) is sleeved on the rotating shaft section (15), one end of the torsion spring (19) forms the connecting section (20) connected to the first baffle (24), and the other end forms the elastic driving section (21) connected to the matching portion (17), and the elastic driving section (21) and the matching groove (9) are arranged on opposite sides of the matching portion (17).

4. The driving mechanism according to claim 3, characterized in that: One end of the rotating shaft section (15) close to the pushing member (7) passes through the second baffle (25) to form a handle portion (11), and the handle portion (11) is used to rotate the rotating shaft section (15).

5. The driving mechanism according to claim 4, characterized in that: The pushing member (7) is a pushing tube (8), one end of the pushing tube (8) close to the sliding block (22) is connected to the side of the second baffle (25) facing away from the first baffle (24), and the handle (11) extends from the other end of the pushing tube (8).

6. The driving mechanism according to claim 5, characterized in that: The bottom plate (23) is provided with a through hole (26), the frame body (1) is provided with a guide rail (27), the guide rail (27) is parallel to the screw rod (12), and the guide rail (27) is inserted into the through hole (26).

7. The driving mechanism according to claim 6, characterized in that: It also comprises a detection module, which is mounted on the frame (1) and is used to detect the sliding distance of the slider (22).

8. The driving mechanism according to claim 7, characterized in that: The detection module comprises a travel potentiometer (28), wherein the travel potentiometer (28) is arranged below the guide rail (27), and the travel potentiometer (28) is connected to the slider (22).

9. The driving mechanism according to claim 1, characterized in that: The first driving member (2) comprises a driving motor (3), and the driving motor (3) is drivingly connected to the screw rod (12) to drive the screw rod (12) to rotate.

10. A syringe pump, characterized in that: It comprises a shell, a syringe and a driving mechanism according to any one of claims 1 to 9, wherein the frame (1) is connected to the shell, the syringe comprises a plunger rod and a tube body, and the end of the push member (7) away from the slider (22) is connected to the plunger rod.

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