Pumping driving mechanism of split type injection pump

Abstract

The invention discloses a pumping driving mechanism of a split type injection pump. A shell comprises an injection clamping part and a driving part; the injection clamping part is used for clamping an injector, and push-pull injection of the injector is achieved through a pumping mechanism arranged on the driving part; the driving part comprises a driving motor, the output end of the driving motor is provided with a damping assembly and a driving gear, and the driving gear is in meshing transmission with the transmission gear of the pumping mechanism; the pumping mechanism comprises a positioning seat, and the positioning seat is fixedly mounted in the bottom cover; an outer transmission block is rotationally mounted on the positioning seat; the other end of the outer transmission block is fixedly installed on the inner wall of the shell, and a guide driving assembly is installed in the outer transmission block in a transmission mode. When the pumping mechanism drives the push block to push and pull, the push block pushes the injector to perform accurate injection along the injection clamping part; high-precision multi-section precise pushing can be achieved, and the transmission stability in the pushing process is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of injection pumps, and in particular to a pumping drive mechanism of a split injection pump. Background Art

[0002] A syringe pump is a medical device used to give patients precise infusions. It pushes the piston of the syringe to perform injections and infusions, achieving high-precision drug injections. It is often used for patients who need small doses of drug injections with precise quantitative control. It uses intravenous administration, and the dosage must be accurate and the total amount must be small. The administration speed is very slow or requires long-term constant infusion.

[0003] At present, most of the existing injection pumps directly fix the stepper motor on the frame of the injection pump. The output shaft of the stepper motor is rigidly connected to the screw rod. It is difficult to control the injection accuracy during the operation of the injection pump, which easily leads to injection volume deviation and poor use effect.

[0004] Therefore, it is urgent to design a pumping drive mechanism for a split injection pump. Summary of the invention

[0005] The purpose of the present invention is to provide a pumping drive mechanism for a split-type injection pump to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a pumping drive mechanism of a split-type injection pump, comprising:

[0007] The housing is a multi-section continuous cylindrical structure, including an injection clamping part and a driving part; the injection clamping part is used to clamp the syringe, and the push-pull injection of the syringe is realized by a pumping mechanism arranged in the driving part; the bottom cover of the driving part is provided with a bottom cover, and the pumping mechanism is fixedly mounted on the bottom cover;

[0008] The driving part comprises a driving motor, which is fixedly mounted on one side of the bottom surface of the driving part, and a damping assembly and a driving gear are mounted on the output end of the driving motor, and the driving gear is meshed with the transmission gear of the pumping mechanism for transmission;

[0009] The pumping mechanism includes a positioning seat, which is fixedly installed in the bottom cover; an external transmission block is rotatably installed on the positioning seat; the other end of the external transmission block is fixedly installed on the inner wall of the shell, and a guide drive component is installed in the external transmission block.

[0010] The end surface of the bottom cover is recessed in a direction away from the housing to form a positioning groove, a positioning ring is fixedly installed in the positioning groove, the positioning ring is an annular structure, and an assembly groove is provided on the inner wall of the positioning ring; the assembly groove is adapted to the shape of the annular protrusion formed on the bottom of the positioning seat;

[0011] A motor seat is also fixedly mounted on one side of the inner surface of the bottom cover, and the driving motor is fixedly mounted on the motor seat.

[0012] A gasket is arranged inside the bottom cover, the gasket is arranged between the positioning ring and the positioning seat, and the gasket is laid on the surface of the bottom cover.

[0013] A support wall is formed inwardly on the side wall of the driving part in the shell near the injection clamping part, and the support wall is arranged close to the side wall of the end of the outer transmission block; the outer transmission block is rotatably arranged between the positioning seat and the support wall; a magnetic attraction component is also installed in the support wall; the positioning seat and the support wall coincide with the center line of the injection clamping part.

[0014] The driving gear is fixedly mounted on the outer wall of the outer transmission block, and an external thread groove is provided in the outer transmission block; the guide drive assembly comprises a guide rod and an inner transmission block and a transfer block arranged on the outside of the guide rod; an external thread is formed on the outer wall of the transfer block, and the external thread is transmission-connected in the external thread groove; and an internal thread groove is provided in the transfer block, and the internal thread formed on the outer wall of the inner transmission block is transmission-arranged in the internal thread groove; a through groove is provided in the inner transmission block, and a guide groove is provided in the through groove, and the guide groove is a spiral structure; the guide rod is fixedly mounted on the positioning seat, and a spiral guide rail is formed on the outer wall of the guide rod, and the guide rail is slidingly arranged along the guide groove.

[0015] A gap of 1-2 mm is reserved between the external thread and the external thread groove.

[0016] A push block is fixedly mounted at the end of the pipe through slot of the inner transmission block, and the minimum spacing between the guide rod and the push block is 10 mm.

[0017] A conical groove is also provided in the circumferential direction of the support wall, and the magnetic block of the magnetic attraction component; the magnetic attraction component also includes an electromagnet, which is fixedly installed on the inner wall of the shell, and the position of the electromagnet corresponds to that of the magnetic block.

[0018] The present invention discloses the following technical effects: the present invention designs the shell as a multi-stage continuous cylindrical structure, the bottom end of which is a driving part, and the injection clamping part is an intermittently contracted guide shell. When the pumping mechanism drives the push block to push and pull, the push block pushes the syringe along the injection clamping part for precise injection, and the pumping mechanism can achieve long-distance multi-stage pushing, which greatly saves the volume of the pumping mechanism and makes the pumping drive mechanism compact; and it can achieve high-precision multi-stage precise pushing, and effectively ensure the transmission stability during the pushing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 A magnified view of the structure;

[0022] Figure 3 It is a schematic diagram of the guide rod structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the witness assembly of the present invention;

[0024] Among them, 1. outer shell; 2. bottom cover; 3. positioning seat; 4. push block; 5. conical groove; 11. drive motor; 12. drive gear; 13. support wall; 14. transmission gear; 21. positioning groove; 22. positioning ring; 23. assembly groove; 24. motor seat; 25. gasket; 31. outer transmission block; 32. annular protrusion; 33. external thread groove; 34. guide rod; 35. inner transmission block; 36. transfer block; 37. external thread; 38. internal thread groove; 39. guide groove; 51. magnetic block; 52. electromagnet; 53. limit groove; 54. limit block; 6. shock absorber column; 61. gear groove; 62. internal gear. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a pumping drive mechanism of a split-type injection pump, comprising:

[0028] The housing 1 is a multi-section continuous cylindrical structure, including an injection clamping part and a driving part; the injection clamping part is used to clamp the syringe, and the push-pull injection of the syringe is realized through the pumping mechanism arranged in the driving part; the bottom cover of the driving part is provided with a bottom cover 2, and the pumping mechanism is fixedly installed on the bottom cover 2;

[0029] The driving part includes a driving motor 11, which is fixedly mounted on one side of the bottom surface of the driving part. A damping assembly and a driving gear 12 are mounted on the output end of the driving motor 11. The driving gear 12 is meshed with a transmission gear 14 of the pumping mechanism for transmission.

[0030] The pumping mechanism includes a positioning seat 3, which is fixedly installed in the bottom cover 2; an external transmission block 31 is rotatably installed on the positioning seat 3; the other end of the external transmission block 31 is fixedly installed on the inner wall of the shell 1, and a guide drive component is installed in the external transmission block 31.

[0031] In one embodiment of the present invention, the shell 1 is a multi-stage continuous cylindrical structure, the bottom end of which is a driving part, and the injection clamping part is an intermittently contracted guide shell. When the pumping mechanism drives the push block 4 to push and pull, the push block 4 pushes the syringe along the injection clamping part for precise injection, and the pumping mechanism can achieve long-distance multi-stage pushing and segmented pushing, which greatly saves the volume of the pumping mechanism and makes the pumping drive mechanism compact.

[0032] In one embodiment of the present invention, the driving motor 11 is disposed on the motor seat 21 on the bottom cover 2. The driving motor 11 installed on the motor seat 21 drives the driving gear 14 on the outer wall of the outer transmission block 31 to rotate through the driving gear.

[0033] Furthermore, a shock absorbing assembly is also provided in the output section of the driving motor 11, and the shock absorbing assembly includes a shock absorbing column 6. The shock absorbing column 6 is a hollow structure, and gear grooves 61 are coaxially provided at both ends thereof. An internal gear 62 is meshingly installed in the gear groove 61, and the two internal gears 62 are respectively installed on the output shaft of the driving motor 11 and the end face of the driving gear 12.

[0034] Furthermore, the internal gear is made of POM material, which can not only prevent the output shaft of the driving motor 11 from deforming during rotation and affecting the transmission, but also has a good shock-absorbing effect.

[0035] The end surface of the bottom cover 2 is recessed in a direction away from the housing 1 to form a positioning groove 21, and a positioning ring 22 is fixedly installed in the positioning groove 21. The positioning ring 22 is an annular structure, and an assembly groove 23 is formed on the inner wall of the positioning ring 22; the assembly groove 23 is adapted in shape to the annular protrusion 32 formed at the bottom of the positioning seat 3;

[0036] A motor seat 24 is fixedly mounted on one side of the inner surface of the bottom cover 2 , and the driving motor 11 is fixedly mounted on the motor seat 24 .

[0037] In one embodiment of the present invention, the bottom cover 2 is snap-fitted with the outer shell 1, and a coaxial positioning groove 21 is provided at the center axis of the injection clamping portion corresponding to the bottom cover 2, which is used to fix the positioning seat 3; the positioning seat 3 is clamped in the positioning ring 22, so that the outer transmission block 31 does not shift during rotation.

[0038] A gasket 25 is disposed inside the bottom cover 2 . The gasket 25 is disposed between the positioning ring 22 and the positioning seat 3 , and the gasket 25 is laid on the surface of the bottom cover 2 .

[0039] Furthermore, a gasket 25 is provided to strengthen the connection and fixation between the positioning ring 22 and the positioning seat 3, and at the same time ensure the stability of the pumping mechanism during transmission.

[0040] A support wall 13 is formed inwardly on the side wall of the driving part near the injection clamping part in the outer shell 1, and the support wall 13 is arranged close to the side wall of the end of the external transmission block 31; the external transmission block 31 is rotatably arranged between the positioning seat 3 and the support wall 13; a magnetic attraction component is also installed in the support wall 13; the positioning seat 3 and the support wall 13 coincide with the center line of the injection clamping part.

[0041] A driving gear 12 is fixedly mounted on the outer wall of the outer transmission block 31, and an external thread groove 33 is provided in the outer transmission block 31; the guide drive assembly includes a guide rod 34 and an internal transmission block 35 and a transfer block 36 arranged on the outside of the guide rod 34; an external thread 37 is formed on the outer wall of the transfer block 36, and the external thread 37 is transmission-connected in the external thread groove 33; and an internal thread groove 38 is provided in the transfer block 36, and the internal thread formed on the outer wall of the internal transmission block 35 is transmission-set in the internal thread groove 38; a through groove is provided in the inner transmission block 35, and a guide groove 39 is provided in the through groove, and the guide groove 39 is a spiral structure; the guide rod 34 is fixedly mounted on the positioning seat 3, and a spiral guide rail is formed on the outer wall of the guide rod 34, and the guide rail is slidingly set along the guide groove 39.

[0042] In one embodiment of the present invention, the transmission process of the pumping mechanism is that the driving motor 11 drives the transmission gear 14 to rotate, and the transmission gear 14 drives the outer transmission block 31 to rotate synchronously. During the rotation process, the transmission gear 14 realizes the synchronous lifting and lowering of the connecting block 36 and the inner transmission block 35 through the transmission of the outer thread groove 33 and the outer thread 37; at the same time, the inner transmission block 35 and the guide rail in the guide rod 34 are guided; the setting of the guide rail can effectively prevent the deviation of the entire pumping structure, and the spiral guide rail conforms to its activity trajectory.

[0043] Furthermore, when the movement reaches the top of the external thread groove 33, the magnetic attraction component is started.

[0044] Furthermore, the support wall 13 has two surfaces that are both arranged close to the outer transmission block 31, and a conical groove 5 is provided on one side of the side wall; the opening of the conical groove 5 gradually increases from the side away from the outer transmission block 31 to the side close to the box; the magnet 51 is a trapezoidal magnet placed in the conical groove 5; a limiting groove 53 is provided inwardly at the opening of the side of the conical groove 5 close to the outer transmission block 31, and a limiting stopper 54 is installed in the limiting groove 53 through a spring, the limiting stopper 54 is made of plastic, and the contact surface with the magnet 51 is an inclined surface.

[0045] Furthermore, the electromagnet 52 of the magnetic attraction component is energized to generate a magnetic field; the magnetic block 51 placed in the conical groove 5 will generate a repulsive force after inducing the magnetic field, thereby pushing the magnet 51 to move toward the outer transmission rod block 31. At this time, the magnet 51 squeezes the limit stop block 54 and the outer transmission block 31 under the action of external force, thereby compressing the gap between the external thread 37 and the external thread groove 33, so that the two can no longer move relative to each other. At this time, the outer transmission block 31 and the transfer block 36 form a whole; under the continuous drive of the drive motor 11, the outer transmission block 31 and the transfer block 36 rotate, so that the internal thread formed on the outer wall of the inner transmission block 35 rotates in the internal thread groove 38, pushing the inner transmission block 35 to continue to drive the push block 4 to move.

[0046] A gap of 1-2 mm is reserved between the external thread 37 and the external thread groove 33 .

[0047] The push block 4 is fixedly mounted on the end of the pipe through groove of the inner transmission block 35, and the minimum distance between the guide rod 34 and the push block 4 is 10 mm.

[0048] A conical groove 5 is also provided in the circumferential direction of the inner side of the support wall, and a magnetic block 51 of the magnetic attraction assembly; the magnetic attraction assembly also includes an electromagnet 52, which is fixedly mounted on the inner wall of the housing 1, and the positions of the electromagnet 52 and the magnetic block 51 correspond.

[0049] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by ordinary technicians in this field should all fall within the scope of protection determined by the claims of the present invention.

Claims

1. A pumping drive mechanism for a split-type syringe pump, characterized in that: include: The housing (1) is a multi-stage continuous cylindrical structure, comprising an injection clamping portion and a driving portion; the injection clamping portion is used to clamp the syringe, and a pumping mechanism provided on the driving portion is used to push and pull the syringe for injection; the bottom cover of the driving portion is provided with a bottom cover (2), and the pumping mechanism is fixedly mounted on the bottom cover (2); The driving part comprises a driving motor (11), the driving motor is fixedly mounted on one side of the bottom surface of the driving part, a damping assembly and a driving gear (12) are mounted on the output end of the driving motor (11), and the driving gear (12) is meshed with a transmission gear (14) of the pumping mechanism for transmission; The pumping mechanism comprises a positioning seat (3), wherein the positioning seat (3) is fixedly mounted in the bottom cover (2); an external transmission block (31) is rotatably mounted on the positioning seat (3); the other end of the external transmission block (31) is fixedly mounted on the inner wall of the outer shell (1), and a guide drive component is rotatably mounted in the external transmission block (31).

2. The pumping drive mechanism of a split-type injection pump according to claim 1, characterized in that: The end surface of the bottom cover (2) is recessed in a direction away from the housing (1) to form a positioning groove (21), a positioning ring (22) is fixedly installed in the positioning groove (21), the positioning ring (22) is an annular structure, and the inner wall of the positioning ring (22) is provided with an assembly groove (23); the assembly groove (23) is adapted in shape to an annular protrusion (32) formed at the bottom of the positioning seat (3); A motor seat (24) is also fixedly mounted on one side of the inner surface of the bottom cover (2), and the drive motor (11) is fixedly mounted on the motor seat (24).

3. The pumping drive mechanism of a split-type injection pump according to claim 2, characterized in that: A gasket (25) is arranged inside the bottom cover (2), the gasket (25) is arranged between the positioning ring (22) and the positioning seat (3), and the gasket (25) is laid on the surface of the bottom cover (2).

4. The pumping drive mechanism of a split-type injection pump according to claim 1, characterized in that: A support wall (13) is formed inwardly on the side wall of the driving part in the housing (1) near the injection clamping part, and the support wall (13) is arranged close to the side wall of the end of the outer transmission block (31); the outer transmission block (31) is rotatably arranged between the positioning seat (3) and the support wall (13); a magnetic attraction component is also installed in the support wall (13); the positioning seat (3) and the support wall (13) coincide with the center line of the injection clamping part.

5. The pumping drive mechanism of a split-type injection pump according to claim 4, characterized in that: The driving gear (12) is fixedly mounted on the outer wall of the outer transmission block (31), and an external thread groove (33) is formed inside the outer transmission block (31); the guide drive assembly comprises a guide rod (34), an inner transmission block (35) and a transfer block (36) arranged outside the guide rod (34); an external thread (37) is formed on the outer wall of the transfer block (36), and the external thread (37) is transmission-connected in the external thread groove (33); and an external thread groove (33) is formed inside the transfer block (36). An internal thread groove (38), an internal thread (39) formed on the outer wall of the internal transmission block (35) is arranged for transmission in the internal thread groove (38); a through groove is provided in the internal transmission block (35), a guide groove (39) is provided in the through groove, and the guide groove (39) is a spiral structure; the guide rod (34) is fixedly mounted on the positioning seat (3), a spiral guide rail is formed on the outer wall of the guide rod (34), and the guide rail is slidably arranged along the guide groove (39).

6. The pumping drive mechanism of a split-type injection pump according to claim 5, characterized in that: A gap of 1-2 mm is reserved between the external thread (37) and the external thread groove (33).

7. The pumping drive mechanism of a split-type injection pump according to claim 5, characterized in that: A push block (4) is fixedly mounted on the end of the pipe through groove of the inner transmission block (35), and the minimum spacing between the guide rod (34) and the push block (4) is 10 mm.

8. The pumping drive mechanism of a split-type injection pump according to claim 5, characterized in that: A conical groove (5) is also provided in the support wall along the circumferential direction, and a magnetic block (51) of the magnetic attraction component; the magnetic attraction component also includes an electromagnet (52), the electromagnet (52) is fixedly mounted on the inner wall of the shell (1), and the electromagnet (52) corresponds to the position of the magnetic block (51).

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