Reciprocating movement mechanism, wriggling device and infusion pump

Abstract

The utility model relates to the technical field of infusion devices, and particularly discloses a reciprocating motion mechanism, a wriggling device and an infusion pump, in the reciprocating motion mechanism, a power piece is arranged on a support, the power piece is connected with a rotating shaft, and the axis of the rotating shaft extends in the first direction; the moving part is arranged on the support and can reciprocate in the second direction, and the moving part is provided with a moving groove. The first direction is perpendicular to the second direction; the cam assembly comprises a cam body and a lantern ring, and the cam body is arranged on the rotating shaft; the lantern ring is arranged on the periphery of the cam body in a sleeving mode, the cam assembly is located in the moving groove, the lantern ring is in friction fit with the two opposite side walls of the moving groove in the second direction, and the lantern ring and the moving piece are made of different materials. According to the arrangement, the friction coefficient between the lantern ring and the moving part is reduced, the transmission efficiency is improved, the abrasion speed is reduced, the service life is prolonged, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of infusion devices, in particular to a reciprocating movement mechanism, a peristaltic device and an infusion pump. Background Art

[0002] As an automatic infusion device, the infusion pump has a wide range of applications in the medical field. Currently, most medical infusion pumps adopt the linear peristalsis principle, that is, a group of eccentric wheels are linearly arranged on a rotating shaft according to a certain rule, and each eccentric wheel drives a peristaltic sheet to move linearly, repeatedly squeezing the infusion tube to achieve the function of infusion.

[0003] In the existing peristaltic mechanism of the infusion pump, the eccentric wheel and the peristaltic sheet are in transmission cooperation by means of sliding friction. Both the eccentric wheel and the peristaltic sheet are made of plastic materials, resulting in large resistance and low transmission efficiency during actual operation, increasing the operating power consumption of the infusion pump, and fast wear leading to increased noise after wear, greatly reducing the service life of the equipment and seriously reducing the user experience of the infusion pump.

[0004] Therefore, it is urgent to study a reciprocating movement mechanism and apply it to the peristaltic mechanism of the infusion pump to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a reciprocating movement mechanism, a peristaltic device and an infusion pump to solve the problems in the prior art that the sliding friction resistance between the eccentric wheel and the peristaltic sheet is large, resulting in low transmission efficiency, fast wear, affecting the service life and user experience.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The reciprocating movement mechanism includes:

[0008] A bracket;

[0009] A power member, arranged on the bracket, the power member is connected with a rotating shaft, and the axis of the rotating shaft extends along a first direction;

[0010] A moving member, the moving member is arranged on the bracket and can reciprocate along a second direction, the moving member is provided with a moving groove; the first direction is perpendicular to the second direction;

[0011] A cam assembly, the cam assembly includes:

[0012] A cam body, the cam body is arranged on the rotating shaft;

[0013] A collar is sleeved on the outer periphery of the cam body. The cam assembly is located in the moving groove, and the collar is in frictional engagement with two side walls of the moving groove that are opposite to each other along the second direction. The materials of the collar and the moving member are different.

[0014] In some embodiments, the cam body is cylindrical, the cam body includes a mounting hole, the axis of the mounting hole is misaligned with the central axis of the cam body, and the rotating shaft passes through and is fixed in the mounting hole.

[0015] In some embodiments, the contour of the mounting hole is non-circular, the contour of the cross-section of the rotating shaft perpendicular to its own axis is non-circular, and is adapted to the contour of the mounting hole.

[0016] In some embodiments, the collar and the cam body are relatively fixed circumferentially around the cam body.

[0017] In some embodiments, among the outer peripheral wall of the cam body and the inner side wall of the collar, one is provided with a protrusion and the other is provided with a groove, and the protrusion is inserted into the groove.

[0018] In some embodiments, the protrusion is provided on the cam body, the groove is provided on the collar, there are several protrusions, and several protrusions are evenly distributed at intervals around the central axis of the cam body. There are several grooves, and several grooves are evenly distributed at intervals around the axis of the collar. Several protrusions are inserted into the corresponding grooves.

[0019] In some embodiments, the protrusion extends along the central axis direction of the cam body, and a relief portion is concavely provided in the middle. The groove extends along the axis direction of the collar, and a contact portion is convexly provided in the middle. The contact portion is inserted into the relief portion, and both ends of the contact portion along the axis direction of the collar respectively abut against both ends of the relief portion along the central axis direction of the cam body.

[0020] In some embodiments, the material of the moving member is metal and the material of the collar is plastic; or, the material of the moving member is plastic and the material of the collar is metal.

[0021] A peristaltic device, the peristaltic device includes the reciprocating movement mechanism according to any one of the above technical solutions. There are several moving members, and several moving members are arranged side by side along the first direction and can all reciprocate along the second direction;

[0022] There are several cam assemblies, and several cam assemblies are arranged side by side along the first direction on the rotating shaft and respectively drive several moving members to reciprocate in sequence.

[0023] The infusion pump includes a base, an infusion tube pressing plate, and the peristaltic device described above. Among them, the peristaltic device and the infusion tube pressing plate are both provided on the base.

[0024] The beneficial effects of the present utility model are as follows:

[0025] The present utility model provides a reciprocating movement mechanism, a peristaltic device, and an infusion pump. In this reciprocating movement mechanism, by providing a collar on the cam body, during the rotation of the cam, sliding friction occurs between the collar and the side wall of the moving groove of the moving part, and the moving part is driven to reciprocate linearly. Since the materials of the collar and the moving part are different, the sliding friction coefficient between the two is greatly reduced, improving the transmission efficiency, reducing the wear speed, thus helping to extend the service life and improving the user experience.

[0026] The peristaltic mechanism has the above-mentioned reciprocating movement mechanism, which can greatly reduce the large sliding friction resistance between the eccentric wheel and the peristaltic piece, thus solving the problems of low transmission efficiency, fast wear, and affecting the service life and user experience.

[0027] The infusion pump has the above-mentioned peristaltic device, which helps to reduce the operating power consumption of the infusion pump, extend the service life, and improve the user experience. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the peristaltic mechanism in the embodiment of the present utility model;

[0029] Figure 2 It is a schematic structural diagram of the cam assembly and the moving part in the embodiment of the present utility model;

[0030] Figure 3 It is a schematic structural diagram of the cam body and the collar in the embodiment of the present utility model;

[0031] Figure 4 It is a schematic structural diagram of the infusion pump in the embodiment of the present utility model.

[0032] In the figure:

[0033] 100, bracket;

[0034] 200, power component; 210, rotating shaft; 220, bearing seat;

[0035] 300, moving part; 310, moving groove;

[0036] 400, cam body; 410, mounting hole; 420, protrusion; 430, avoidance part;

[0037] 500, collar; 510, groove; 520, abutting part;

[0038] 610, First gear; 620, Second gear; 630, Third gear;

[0039] 710, Base; 720, Infusion tube pressing plate. Detailed implementation manner

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, 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 should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0042] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0044] Such as Figures 1 to 3As shown in the figure, this embodiment provides a reciprocating movement mechanism, which includes a bracket 100, a power member 200, a moving member 300, and a cam assembly. Among them, the power member 200 is arranged on the bracket 100, the power member 200 is connected with a rotating shaft 210, and the axis of the rotating shaft 210 extends along a first direction; the moving member 300 is arranged on the bracket 100 and can reciprocate along a second direction, and the moving member 300 is provided with a moving groove 310; the first direction is perpendicular to the second direction; the cam assembly includes a cam body 400 and a collar 500, the cam body 400 is arranged on the rotating shaft 210; the collar 500 is sleeved on the outer periphery of the cam body 400, the cam assembly is located in the moving groove 310, and the collar 500 is in frictional engagement with two side walls of the moving groove 310 opposite to each other along the second direction, and the materials of the collar 500 and the moving member 300 are different.

[0045] The above settings enable sliding friction to occur between the collar 500 and the side wall of the moving groove 310 of the moving member 300 during the rotation of the cam, and drive the moving member 300 to reciprocate in a straight line direction. Since the materials of the collar 500 and the moving member 300 are different, the sliding friction coefficient between the two is greatly reduced, the transmission efficiency is improved, the wear speed is reduced, which helps to extend the service life and improve the user experience.

[0046] Two bearing seats 220 are arranged on the bracket 100 at intervals, the rotating shaft 210 passes through the two bearing seats 220, and a bearing is arranged between the rotating shaft 210 and the bearing seats 220.

[0047] In some embodiments, the cam body 400 is cylindrical, the cam body 400 includes a mounting hole 410, the axis of the mounting hole 410 is arranged offset from the central axis of the cam body 400, and the rotating shaft 210 passes through and is fixed in the mounting hole 410. In this embodiment, the cam body 400 can also be called an eccentric wheel. The above settings have a simple structure and are convenient to realize the stable connection between the cam body 400 and the rotating shaft 210.

[0048] To ensure the synchronous rotation between the cam body 400 and the rotating shaft 210, that is, to realize the relative fixation between the cam body 400 and the rotating shaft 210 in the circumferential direction of the rotating shaft 210, in some embodiments, the contour of the mounting hole 410 is non-circular, the contour of the cross-section of the rotating shaft 210 perpendicular to its own axis is non-circular, and is adapted to the contour of the mounting hole 410. Exemplarily, the contour of the mounting hole 410 can be a quadrilateral, a pentagon or a hexagon. The contour of the radial cross-section of the rotating shaft 210 is also a corresponding quadrilateral, pentagon or hexagon. In other embodiments, the cam body 400 can be locked with the rotating shaft 210 by screws.

[0049] To avoid relative rotation between the collar 500 and the cam body 400, which may cause wear to the cam body 400, in some embodiments, the collar 500 and the cam body 400 are circumferentially relatively fixed around the cam body 400. The above arrangement realizes the relative friction between the collar 500 and the side wall of the moving groove 310, making the structure between the collar 500 and the cam body 400 simpler and easier to assemble.

[0050] In some embodiments, on either the outer peripheral wall of the cam body 400 or the inner side wall of the collar 500, one is provided with a protrusion 420 and the other is provided with a groove 510, and the protrusion 420 is inserted into the groove 510. The above limiting structure is simple, easy to prepare, and can effectively ensure the circumferential relative fixation between the collar 500 and the cam body 400.

[0051] Furthermore, the protrusion 420 is provided on the cam body 400, the groove 510 is provided on the collar 500, there are a plurality of protrusions 420, and the plurality of protrusions 420 are evenly distributed at intervals around the central axis of the cam body 400. There are a plurality of grooves 510, and the plurality of grooves 510 are evenly distributed at intervals around the axis of the collar 500. The plurality of protrusions 420 are inserted into the corresponding grooves 510. The above arrangement makes the circumferential fixation between the collar 500 and the cam body 400 more firm; in addition, it also improves the uniformity of the structure of the collar 500 and the cam body 400.

[0052] In some embodiments, the protrusion 420 extends along the central axis direction, and a relief portion 430 is recessed in the middle. The groove 510 extends along the axis direction of the collar 500, and a contact portion 520 protrudes in the middle. The contact portion 520 is inserted into the relief portion 430, and both ends of the contact portion 520 along the axis direction of the collar 500 respectively abut against both ends of the relief portion 430 along the central axis direction of the cam body 400. By means of the relief portion 430 and the contact portion 520, the collar 500 and the cam body 400 are relatively fixed along the axis direction of the collar 500, preventing the collar 500 from falling off the cam body 400.

[0053] In other embodiments, a countersunk hole may be provided on the collar 500, and after the fixing screw passes through the countersunk hole, it is screwed onto the cam body 400, and the nut of the fixing screw is located in the countersunk hole.

[0054] Regarding the materials of the moving member 300 and the collar 500, in some embodiments, the moving member 300 is made of metal, and the collar 500 is made of plastic. Specifically, the moving member 300 can be made of stainless steel or aluminum alloy, and the collar 500 can be made of wear-resistant plastics with self-lubricating properties such as nylon or polyoxymethylene. Of course, in other embodiments, the moving member 300 can be made of plastic, and the collar 500 can be made of metal. Specifically, the moving member 300 can be made of wear-resistant plastics with self-lubricating properties such as nylon or polyoxymethylene, and the collar 500 can be made of stainless steel or aluminum alloy.

[0055] In order to ensure the controllability of the moving position of the moving member 300 , the power member 200 may be a servo motor.

[0056] The present embodiment also provides a peristaltic device, which includes the above-mentioned reciprocating mechanism, wherein a plurality of moving members 300 are provided, and the plurality of moving members 300 are arranged in parallel along the first direction, and can all reciprocate along the second direction; a plurality of cam assemblies are provided, and the plurality of cam assemblies are arranged in parallel on the rotating shaft 210 along the first direction, and respectively drive the plurality of moving members 300 to reciprocate in sequence. Regarding the arrangement of the plurality of cam assemblies, specifically, the plurality of cam assemblies are arranged linearly according to a certain rule, so that the plurality of moving members 300 produce a wave-like reciprocating motion. It should be noted that the specific arrangement of the plurality of cam assemblies is well known to those skilled in the art, so it will not be described in detail here.

[0057] In some embodiments, the peristaltic device further includes a gear set, and the power member 200 and the rotating shaft 210 are driven by the gear set. The gear set includes a first gear 610, a second gear 620 and a third gear 630, wherein the first gear 610 is connected to the output end of the power member 200, the second gear 620 is rotatably arranged on the bracket 100, the third gear 630 is fixed to the rotating shaft 210, and the second gear 620 is meshed between the first gear 610 and the third gear 630. The gear set can play a deceleration role through the gear ratio of each tooth, and the specific gear ratio can be set according to the deceleration requirement. The method of achieving the deceleration purpose through the gear ratio is well known to the staff in the field, so it will not be described in detail here.

[0058] like Figures 1 to 4As shown in the figure, this embodiment also provides an infusion pump, which includes a base 710, an infusion tube pressing plate 720, and the above-mentioned peristaltic device. Among them, the peristaltic device and the infusion tube pressing plate 720 are both arranged on the base 710. A channel is formed between the infusion tube pressing plate 720 and the moving member 300. During use, the infusion tube is placed in the channel. Driven by the power member 200, the rotating shaft 210 rotates, and drives a plurality of cam assemblies to rotate simultaneously. Under the frictional cooperation of the collar 500 and the moving member 300, a plurality of moving members 300 are driven to make a wave-like motion, thereby squeezing out the liquid in the infusion tube.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A reciprocating mechanism, characterized in that: include: Bracket (100); A power member (200) is disposed on the bracket (100), the power member (200) is connected to a rotating shaft (210), and the axis of the rotating shaft (210) extends along a first direction; A moving member (300), the moving member (300) being disposed on the bracket (100) and capable of reciprocating along a second direction, the moving member (300) being provided with a moving groove (310); the first direction is perpendicular to the second direction; A cam assembly, the cam assembly comprising: A cam body (400), wherein the cam body (400) is disposed on the rotating shaft (210); A collar (500) is sleeved on the outer periphery of the cam body (400), the cam assembly is located in the movable groove (310), and the collar (500) is frictionally matched with two side walls of the movable groove (310) opposite to each other along the second direction, and the collar (500) and the movable member (300) are made of different materials.

2. The reciprocating mechanism according to claim 1, characterized in that: The cam body (400) is cylindrical and comprises a mounting hole (410). The axis of the mounting hole (410) is offset from the central axis of the cam body (400). The rotating shaft (210) passes through and is fixed in the mounting hole (410).

3. The reciprocating mechanism according to claim 2, characterized in that: The profile of the mounting hole (410) is non-circular, and the profile of the cross section of the rotating shaft (210) along a direction perpendicular to its own axis is non-circular and is adapted to the profile of the mounting hole (410).

4. The reciprocating mechanism according to any one of claims 1 to 3, characterized in that: The collar (500) and the cam body (400) are relatively fixed around the circumference of the cam body (400).

5. The reciprocating mechanism according to claim 4, characterized in that: One of the outer peripheral wall of the cam body (400) and the inner side wall of the collar (500) is provided with a protrusion (420), and the other is provided with a groove (510), and the protrusion (420) is inserted into the groove (510).

6. The reciprocating mechanism according to claim 5, characterized in that: The protrusion (420) is provided on the cam body (400), and the groove (510) is provided on the collar (500). A plurality of protrusions (420) are provided, and the plurality of protrusions (420) are evenly spaced around the central axis of the cam body (400). A plurality of grooves (510) are provided, and the plurality of grooves (510) are evenly spaced around the axis of the collar (500), and the plurality of protrusions (420) are inserted into corresponding grooves (510).

7. The reciprocating mechanism according to claim 5, characterized in that: The protrusion (420) extends along the central axis direction of the cam body (400), and a relief portion (430) is recessed in the middle; the groove (510) extends along the axial direction of the collar (500), and a contact portion (520) is protruded in the middle; the contact portion (520) is inserted into the relief portion (430), and the two ends of the contact portion (520) along the axial direction of the collar (500) respectively abut against the two ends of the relief portion (430) along the central axis direction of the cam body (400).

8. The reciprocating mechanism according to claim 1, characterized in that: The material of the moving part (300) is metal, and the material of the collar (500) is plastic; or, the material of the moving part (300) is plastic, and the material of the collar (500) is metal.

9. A peristaltic device, comprising the reciprocating mechanism according to any one of claims 1 to 8, characterized in that: A plurality of the moving members (300) are provided, and the plurality of the moving members (300) are arranged in parallel along the first direction, and can all reciprocate along the second direction; A plurality of cam assemblies are provided, and the plurality of cam assemblies are arranged in parallel on the rotating shaft (210) along the first direction, and respectively drive a plurality of the moving members (300) to reciprocate in sequence.

10. An infusion pump, characterized in that: It comprises a base (710), an infusion tube pressing plate (720) and the peristaltic device according to claim 9, wherein the peristaltic device and the infusion tube pressing plate (720) are both arranged on the base (710).

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