Injection driving device and micro-injection pump

Abstract

The utility model provides an injection driving device and a micro-injection pump, the injection driving device comprises a motor, a reduction gear and a screw rod, the top of the motor is fixedly provided with a mounting rack, one side of the mounting rack is provided with a groove type optocoupler, a counting code disc is arranged above the mounting rack, the counting code disc is connected with the motor through a rotating shaft, and the motor is connected with the groove type optocoupler. And one side of the counting code disc is positioned in the groove-shaped optical coupler, so that a receiver and an emitter of the groove-shaped optical coupler are aligned to an annular area formed by connecting the edges of the two ends of a plurality of grating holes formed in the counting code disc respectively. According to the injection driving device, the rotating speed and the rotating angle of the output shaft of the motor are measured through the matching of the groove-shaped optocoupler and the counting code disc, the propelling distance of the piston is calculated according to the pitch of the lead screw, the rotating speed of the motor is accurately controlled according to the injection amount, and the injection precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a micro -injection pump especially a injection drive device and micro -injection pump. BACKGROUND

[0002] For the diabetes patient still needs to inject insulin accurately, trace, even, continuously into the body, can satisfy in the long time inside the corresponding medicine frequent injection, to satisfy the body keeps the stable and health of corresponding function. Similarly, when carrying out injection treatment to human special part pathological change, such as eyeball injection, ear inner tympanic cavity injection, intracranial injection etc., its injection site is very fragile, and the drug solution dosage is very small, and the dosage of some parts is even less than 0.5ml, and the micro -injection pump needs to be used for accurate, trace injection when injecting. Therefore, how to improve the injection precision of the micro -injection pump is the problem that the micro -injection pump manufacturer has been studying.

[0003] In addition, the existing micro -injection pump is mostly large in whole machine volume, and is heavy in structure, and is inconvenient to carry. Therefore, miniaturization and light weight of the micro -injection pump are also the direction that the injection pump production enterprise has been studying. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of injection drive devices that can improve injection precision, and the utility model further provides a micro -injection pump containing above-mentioned injection drive device, the micro -injection pump is not only high in injection precision, and its structure is compact, small in volume, light in weight.

[0005] To achieve the above object, the utility model provides an injection drive device, which comprises a motor, a reduction gear and a lead screw. The output shaft of the motor is connected to the lead screw through the reduction gear. An installation rack is fixedly arranged on the top of the motor. A slot-shaped photoelectric coupler is arranged on one side of the installation rack. A counting code disc is arranged above the installation rack. The counting code disc is connected to the motor through a rotating shaft, so that the counting code disc rotates synchronously with the output shaft of the motor. The slot-shaped photoelectric coupler is located on one side of the counting code disc, and the edge of the two ends of a plurality of grating holes opened on the counting code disc is connected to the receiver and the transmitter of the slot-shaped photoelectric coupler respectively to form an annular area. The slot-shaped photoelectric coupler is connected to the control system of the injection pump. Through the cooperation of the slot-shaped photoelectric coupler and the counting code disc, the rotational speed and the rotation angle of the output shaft of the motor are measured. The piston advancing distance is calculated according to the pitch of the lead screw. The rotational speed of the motor is accurately controlled according to the injection amount, and the idle running of the motor is prevented, thereby improving the injection precision.

[0006] Preferably, the motor is fixedly installed on the support plate through the base plate, and a fixed plate and a bottom plate parallel to the support plate are arranged above and below the support plate respectively, the fixed plate is located at one side of the motor, and a support column is arranged between the fixed plate, the support plate and the bottom plate, so that two layers of vertically arranged spaces are formed between the fixed plate, the support plate and the bottom plate to accommodate the reduction gear.

[0007] Preferably, the support column is a hollow structure.

[0008] Preferably, the lead screw is located at one side of the motor and is vertically arranged, the bottom end of the lead screw is rotatably connected to the fixed plate through a bearing, and the bearing is installed in a bearing seat fixed on the fixed plate.

[0009] Preferably, the mounting frame is an L-shaped structure formed by fixedly connecting a horizontal transverse plate and a vertical vertical plate, and the groove-shaped optical coupler is fixedly installed on the vertical plate through the mounting plate.

[0010] The utility model also provides a micro -injection pump, this micro -injection pump includes the bottom shell of top opening, set up in the drive arrangement and syringe of bottom shell, be provided with the cover plate on the opening of bottom shell, drive arrangement is the injection drive device of above -mentioned technical scheme, be provided with the screw sleeve with internal thread that is adapted with it on the lead screw, screw sleeve and lead screw form screw pair, screw sleeve and the fixed connection of syringe push rod.

[0011] Preferably, a groove for accommodating the motor is arranged on the bottom plate of the bottom shell, and clamping plates for clamping the base plate are arranged on both sides of the lower part of the groove.

[0012] Preferably, an L-shaped partition plate is arranged above the clamping plate, one end of the partition plate is fixedly connected to the clamping plate, the other end is fixedly connected to the side wall of the bottom shell, a clamping groove is formed in the partition plate corresponding to the position of the syringe to fix the bearing seat, and a fixed block and a limiting block are arranged on the side wall of the bottom shell below the partition plate, the limiting block is two, one limiting block corresponds to the groove, and the other limiting block corresponds to the clamping groove.

[0013] Preferably, a limiting plate is arranged above the partition plate, two parallel clamping strips are arranged on both sides of the clamping groove, the limiting plate, the partition plate and the clamping strips enclose an accommodating cavity for accommodating the push rod, and an arc-shaped groove adapted to the push rod is formed in the limiting plate.

[0014] Preferably, an accommodating chamber for accommodating a syringe barrel is arranged above the accommodating cavity.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] 1. The rotation speed and angle of the motor output shaft are measured by the cooperation of the slot type photoelectric coupler and the counting code disc, the piston pushing distance is calculated according to the lead of the screw rod, the rotation speed of the motor is accurately controlled according to the injection amount, the motor is prevented from idling and losing steps, and the injection precision is improved;

[0017] 2. The motor is arranged on one side of the upper gear chamber, the structure is compact, the arrangement is reasonable, the gear reduction chamber is composed of three parallel plates, the gear reduction is facilitated, the space is more utilized, and the injection pump is lightened and miniaturized;

[0018] 3. The bottom shell is divided into different areas by setting the limiting plate, the fixing block, the limiting block and the partition plate which are integrally formed with the bottom shell to install corresponding parts, the layout is reasonable, the assembly is facilitated, the parts are limited and fixed by the structure of the bottom shell, the structure is compact, no other components are used for fixing, the weight of the whole machine is reduced, the lightening and miniaturization of the injection pump are met. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of this specification, for further understanding of the utility model, and with the description together are used for explaining the principle of the utility model. In the drawings:

[0020] Figure 1 It is the structure schematic view of the injection driving device of the utility model embodiment 1;

[0021] Figure 2 It is the internal structure schematic view of the micro-injection pump of the utility model embodiment 2;

[0022] Figure 3 It is Figure 2 The exploded structure schematic view of driving device and injector.

[0023] The meaning represented by the reference numerals in the drawings is as follows: 1, click, 2, mounting frame, 3, mounting plate, 4, slot type photoelectric coupler, 5, rotating shaft, 6, counting code disc, 7, screw rod, 8, bearing seat, 9, fixed plate, 10, support plate, 11, bottom plate, 12, stand, 13, gear reduction gear, 14, backing plate, 15, terminal, 16, bottom shell, 17, push rod, 18, injection barrel, 19, connecting pipe, 20, puncture device, 21, electromagnetic switch, 22, button electromagnetic, 23, screw sleeve, 24, injection barrel containing chamber, 25, limiting plate, 26, containing cavity, 27, partition plate, 28, clamping groove, 29, fixing block, 30, limiting block, 31, clamping plate, 32, groove, 33, grating hole. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below with reference to the drawings, but the present application can be implemented in various different ways within the scope of the claims.

[0025] It should be noted that the terms used in the present application are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used in the present application, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the present application, they indicate the presence of a feature, device, component and / or combination thereof.

[0026] In the description of the present application, it should be understood that the terms "bottom", "top", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Example 1: see Figure 1 and Figure 3The injection driving device for driving the syringe of a micro-injection pump comprises a motor 1, a speed reduction gear 13 and a screw rod 7. The motor 1 is vertically arranged and is a double-shaft motor. The output shaft at the bottom end of the motor 1 is connected with the screw rod 7 through the speed reduction gear 13. A mounting rack 2 is fixedly arranged at the top of the motor 1. The mounting rack 2 is an L-shaped metal rack composed of a horizontal transverse plate and a vertical vertical plate. A slot-shaped photoelectric coupler 4 is fixedly arranged on one side of the mounting rack 2 through a mounting plate 3. A counting code disc 6 is arranged above the mounting rack 2. The counting code disc 6 is connected with the motor 1 through a rotating shaft 5, so that the counting code disc 6 rotates synchronously with the output shaft of the motor 1. Specifically, the rotating shaft 5 is another output shaft of the double-shaft motor, that is, the output shaft at the top of the motor 1. The rotating shaft 5 penetrates through the mounting rack 2 and is rotatably connected with the mounting rack 2. The slot-shaped photoelectric coupler 4 is fixedly arranged on the vertical plate of the mounting rack 2 and is located on one side of the counting code disc 6. The counting code disc 6 is located in the slot-shaped photoelectric coupler 4, so that the receiver and the transmitter of the slot-shaped photoelectric coupler 4 are connected with the annular areas formed by the edges of the two ends of the plurality of grating holes 33 arranged on the counting code disc 6, respectively. The slot-shaped photoelectric coupler 4 is connected with the control system of the injection pump. Through the cooperation of the slot-shaped photoelectric coupler 4 and the counting code disc 6, the rotating speed of the output shaft of the motor is measured by using photoelectric conversion technology, so that the rotating speed of the screw rod 7 is measured. The advancing distance is calculated according to the pitch of the screw rod 7. Meanwhile, the rotating angle of the output shaft of the motor is measured, so that the injection precision is improved. The bottom shell 16 and the cover plate are injection molded parts, and the bottom shell and the cover plate are clamped together.

[0029] In the embodiment, the motor 1 is fixedly arranged on the support plate 10 through the base plate 14. The fixed plate 9 and the bottom plate 11 are arranged above and below the support plate 10, respectively, and are arranged in parallel with the support plate 10. The fixed plate 9 is located on one side of the motor 1. The support column 12 is arranged between the fixed plate 9, the support plate 10 and the bottom plate 11, so that there are two layers of vertically arranged spaces between the fixed plate 9, the support plate 10 and the bottom plate 11 to accommodate the speed reduction gear 13. The fixed plate 9, the bottom plate 11 and the support plate can be made of galvanized sheet or stainless steel sheet. The speed reduction gear chamber is designed as two layers stacked above and below. The motor 1 is arranged on one side of the upper gear chamber. The structure is compact and reasonable. The gear chamber is composed of three parallel plates, which is convenient for assembling the speed reduction gear and is also beneficial to the utilization of space. The support column 12 is a hollow structure and is made of a cylinder material, which is light in weight and is beneficial to the light weight of the driving device. The speed reduction gear of the embodiment is a three-stage speed reduction gear. The screw rod 7 is located on one side of the motor 1 and is vertically arranged. The bottom end of the screw rod 7 is rotatably connected with the fixed plate 9 through a bearing. The bearing is arranged in a bearing seat 8 fixedly arranged on the fixed plate 9.

[0030] This embodiment sets a counting code disk that rotates synchronously with the output shaft at the other end of the motor output shaft. The code disk is coupled with a slotted optocoupler to test the speed and angle of the output shaft. Then, the speed and feed distance of the lead screw are calculated by using the reduction ratio of the reduction gear. Finally, the speed and rotation angle of the motor are controlled by a controller connected to the motor, thereby improving the injection accuracy.

[0031] Example 2: See Figure 2 and Figure 3 This embodiment provides a micro-injection pump, which includes a bottom shell 16 with a top opening, a drive device disposed within the bottom shell 16, and a syringe. A cover plate is provided on the opening of the bottom shell 16. The drive device in this embodiment is the injection drive device of Embodiment 1, and the specific structure of the drive device is the same as that of Embodiment 1. A threaded sleeve 23 with internal threads is provided on the lead screw 7, and the threaded sleeve 23 and the lead screw 7 form a threaded pair. The threaded sleeve 23 is fixedly connected to the plunger 17 of the syringe. The plunger 17 is a hollow circular structure with reinforcing ribs on opposite sides. The threaded sleeve 23 is fixed in the inner cavity of the plunger 17. A piston 27 is fixedly connected to the other end of the plunger 17. A sealing groove is provided on the piston 34, which is arranged circumferentially, and a sealing ring is installed in the sealing groove. The piston 24 is located inside the syringe barrel 18. The cross-section of the syringe barrel 18 is a rectangle with rounded corners. This design can meet the requirements for containing liquid medicine and, compared to a circle, can reduce the thickness of the injection pump, thus preparing for miniaturization. The piston 34 has the same shape as the inner cavity of the syringe 18, also a rectangle with rounded corners. This structure makes it difficult for the syringe piston to rotate, thus ensuring the accuracy of its advancement. A button battery 22 and an electromagnetic switch 21 are located on the side of the motor 1 away from the syringe. A terminal block 15 is located on the motor 1 near the button battery 22. A puncture needle 20 is located in the middle of the bottom shell 16. This design makes full use of the space inside the bottom shell 1, with a reasonable layout, which is conducive to the miniaturization of the syringe pump.

[0032] See Figure 2 The bottom plate 11 of the bottom shell is provided with a groove 32 for accommodating the motor 1. On both sides of the lower part of the groove 32, there are clamping plates 31 for clamping the pad 14. The clamping plates 31 are provided with limiting grooves that are adapted to the pad 14. The clamping plates 31 and the bottom plate of the bottom shell 16 are an integral structure.

[0033] L-shaped partition plate 27 is arranged above the card plate 31, one end of the partition plate 27 is fixedly connected with the card plate 31, the other end is fixedly connected with the side wall of the bottom shell 16, the position of the syringe is provided with a clamping groove 28 on the partition plate 27, so as to fix and support the bearing seat 8, the fixed block 29 and the limiting block 30 which are arranged at intervals below the partition plate 27 are arranged on the side wall of the bottom shell 16, the limiting block 30 is two, one of the limiting blocks 30 corresponds to the groove 32, and the other corresponds to the clamping groove 28. Above the partition plate 27, two parallel and spaced limiting plates 25 are arranged on both sides of the clamping groove 28, the partition plate 27 and the two clamping strips 34 are enclosed to form a containing cavity 26 for containing the push rod 17, an arc-shaped slot adapted to the push rod 17 is formed on the limiting plate 25, and the push rod 17 is supported. Above the containing cavity 26, a containing chamber 24 for containing the injection cylinder 18 is arranged, and the containing chamber 24 is also enclosed by two limiting strips fixed on the bottom plate of the bottom shell 16, a positioning plate fixed on the side wall of the bottom shell 16 and the limiting plate 25, and the containing chamber 24 is recessed downward along the bottom plate of the bottom shell 16. Such design is beneficial to the miniaturization of the injection pump.

[0034] The micro-injection pump of the embodiment is beneficial to the miniaturization of the injection pump by reasonable layout of the driving device, the syringe, the puncture needle and the battery, and full use of the space of the bottom shell, and the bottom shell is divided into different areas by arranging the limiting plate, the fixed block, the limiting block and the partition plate which are integrally formed with the bottom shell to install corresponding components, the layout is reasonable and convenient for assembly, and the components are limited and fixed by using the structure of the bottom shell, so that the structure is compact.

[0035] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An injection drive device comprising a motor, a reduction gear, and a screw rod, an output shaft of the motor being connected to the screw rod through the reduction gear, characterized in that, The motor is fixedly installed on the support plate through a base plate, and a fixed plate and a bottom plate are arranged above and below the support plate respectively and are arranged in parallel with the support plate, the fixed plate is located on one side of the motor, and a support column is arranged between the fixed plate, the support plate and the bottom plate, so that two layers of vertically arranged spaces are formed between the fixed plate, the support plate and the bottom plate to accommodate the speed reducer.

2. The injection drive device according to claim 1, characterized in that The support column is a hollow structure.

3. The injection drive device of claim 2, wherein The screw rod is located on one side of the motor and is vertically arranged, the bottom end of the screw rod is rotatably connected with the fixed plate through a bearing, and the bearing is installed in a bearing seat fixed on the fixed plate.

4. The injection drive device of claim 2, wherein The mounting frame is an L-shaped structure formed by fixed connection of a horizontal transverse plate and a vertical vertical plate, and the groove-shaped optical coupler is fixedly installed on the vertical plate through a mounting plate.

5. The injection drive device of claim 1, wherein, The driving device is the injection driving device of any one of claims 1-5, a screw sleeve with an internal thread is arranged on the screw rod and is adapted to the screw rod, the screw sleeve and the screw rod form a threaded pair, and the screw sleeve is fixedly connected with the push rod of the syringe.

6. A syringe pump comprising a top open bottom housing, a drive means disposed within the bottom housing and a syringe, a cover plate being disposed over the opening of the bottom housing characterised in that, The bottom plate of the bottom shell is provided with a groove for accommodating the motor, and clamping plates for clamping the base plate are arranged on both sides of the lower part of the groove.

7. The syringe pump of claim 6, wherein, An L-shaped partition plate is arranged above the clamping plate, one end of the partition plate is fixedly connected with the clamping plate, the other end is fixedly connected with the side wall of the bottom shell, a clamping groove is formed in the partition plate corresponding to the position of the syringe to fix the bearing seat, and a fixed block and a limiting block are arranged on the side wall of the bottom shell below the partition plate, the limiting block is two, one limiting block corresponds to the groove, and the other limiting block corresponds to the clamping groove.

8. The syringe pump of claim 7, wherein, A limiting plate is arranged above the partition plate, two clamping strips are arranged on both sides of the clamping groove in parallel, the limiting plate, the partition plate and the clamping strips form an accommodation cavity for accommodating the push rod, and an arc-shaped groove matched with the push rod is formed in the limiting plate.

9. The syringe pump of claim 8, wherein, An accommodation chamber for accommodating a syringe is arranged above the accommodation cavity.

10. The syringe pump of claim 9, wherein, ​

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