阅读说明：本技术 一种蠕动泵 (Peristaltic pump ) 是由 胡庆磊 黄凯 李宁 李梦婷 饶建新 于 2020-03-23 设计创作，主要内容包括：本发明涉及构造一种蠕动泵,包括供软管穿过的泵壳、设置在所述泵壳中的弹性机构、可转动设置在所述泵壳中挤压所述软管的挤压机构；所述挤压机构包括驱动组件、以及由所述驱动组件带动转动挤压所述软管的滚轮组件；所述弹性机构用于调节所述滚轮组件与所述软管之间的距离。该蠕动泵通过在泵壳中设置弹性机构,进而可调节滚轮组件与软管之间的距离,从而可避免软管磨损而无法使用,延长软管的使用寿命。该蠕动泵具有使用寿命长、脉冲小、精度高、结构简单可小型化的优点。(The invention relates to a peristaltic pump, which comprises a pump shell for a hose to pass through, an elastic mechanism arranged in the pump shell, and a squeezing mechanism which is rotatably arranged in the pump shell and squeezes the hose; the extrusion mechanism comprises a driving component and a roller component which is driven by the driving component to rotate and extrude the hose; the elastic mechanism is used for adjusting the distance between the roller assembly and the hose. This peristaltic pump is through setting up elastic mechanism in the pump case, and then the distance between adjustable wheel components and the hose to can avoid the hose wearing and tearing and can't use, the life of extension hose. The peristaltic pump has the advantages of long service life, small pulse, high precision, simple structure and miniaturization.)

1. A peristaltic pump, characterized by comprising a pump housing (10) through which a flexible tube (20) passes, an elastic mechanism (30) provided in the pump housing (10), and a pressing mechanism (40) rotatably provided in the pump housing (10) to press the flexible tube (20);

the extrusion mechanism (40) comprises a driving component (42) and a roller component (41) which is driven by the driving component (42) to rotate and extrude the hose (20);

the elastic mechanism (30) is used for adjusting the distance between the roller assembly (41) and the hose (40).

2. Peristaltic pump according to claim 1, wherein said roller assembly (41) comprises a rotatably arranged roller frame (411), a plurality of rollers (412) arranged on said roller frame (411) circumferentially and equidistantly along said roller frame (411) and rotatable;

the driving assembly (42) is connected with the roller carrier (411) to drive the roller carrier (411) to rotate, and further drive the roller (412) to rotate.

3. Peristaltic pump according to claim 2, wherein said elastic means (30) comprise an elastic ball mounted on said roller carriage (411);

the rollers (412) are arranged on the periphery of the elastic ball, elastically abut against the elastic ball and are driven by the elastic ball to reciprocate along the radial direction of the elastic ball so as to press the hose (20) in the radial direction of the hose (20).

4. Peristaltic pump according to claim 2, wherein said elastic means (30) comprise a plurality of elastic members; one end of each elastic piece is connected with the roller frame (411) and the other end of each elastic piece is connected with the roller (412) so as to drive the roller (412) to reciprocate in the radial direction of the hose (20).

5. A peristaltic pump as claimed in claim 4, wherein the resilient member comprises a spring or resilient lever.

6. Peristaltic pump according to claim 2, characterized in that said elastic means (30) comprise an elastic table provided in said pump casing (10); the elastic force table is positioned on the side of the hose (20) opposite to the roller assembly (41) so as to apply elastic force to the hose (20) when the pressing mechanism (40) presses the hose (20).

7. Peristaltic pump according to claim 3 or 4, characterized in that a guide assembly is provided on said roller carriage (411) in correspondence with said rollers (412) for guiding the reciprocating movement of said rollers (412) in a radial direction of said hose (20).

8. Peristaltic pump according to claim 7, wherein the guiding assembly comprises a first guiding groove (4111) provided on the roller frame (411) and through which the roller (412) passes by a rotating shaft of the roller (412).

9. Peristaltic pump according to claim 7, characterized in that said guide assembly comprises a guide bracket (50) provided on the periphery of said roller carriage (411) and extending in the direction of the inner side wall of said pump housing (10);

the guide bracket (50) comprises a first bracket body and a second bracket body matched with the first bracket body; and second guide grooves for guiding the rollers (412) are respectively formed in the inner sides of the first frame body and the second frame body and are used for allowing two ends of a rotating shaft of the rollers (412) to penetrate through.

10. Peristaltic pump according to claim 1, characterized in that said elastic means (30) comprise an elastic ball;

the pressing mechanism (40) comprises a transmission assembly (44) connected with the driving assembly (42) and the roller assembly (41); the transmission assembly (44) comprises a first transmission wheel (441) and a second transmission wheel (442) which are arranged at two sides of the elastic ball, and a transmission belt (443) which is sleeved on the first transmission wheel (441) and the second transmission wheel (442) and elastically abuts against the elastic ball;

the drive assembly (42) is connected with the first drive wheel (441);

the roller assembly (41) comprises a plurality of rollers (412), and the rollers (412) are arranged on the transmission belt (443) at intervals.

Technical Field

The present invention relates to pumps, and more particularly to peristaltic pumps.

Background

Disclosure of Invention

The invention aims to provide an improved peristaltic pump.

The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a peristaltic pump, which comprises a pump shell for a hose to pass through, an elastic mechanism arranged in the pump shell, and a pressing mechanism which is rotatably arranged in the pump shell and presses the hose;

the extrusion mechanism comprises a driving component and a roller component which is driven by the driving component to rotate and extrude the hose;

the elastic mechanism is used for adjusting the distance between the roller assembly and the hose.

Preferably, the roller assembly comprises a roller frame which can be rotatably arranged, and a plurality of rollers which are equidistantly arranged on the roller frame along the circumferential direction of the roller frame and can rotate;

the driving assembly is connected with the roller carrier to drive the roller carrier to rotate, and further drive the rollers to rotate.

Preferably, the elastic mechanism comprises an elastic ball mounted on the roller frame;

the rollers are arranged on the periphery of the elastic ball, elastically abut against the elastic ball and are driven by the elastic ball to reciprocate along the radial direction of the elastic ball so as to extrude the hose in the radial direction of the hose.

Preferably, the resilient mechanism comprises a plurality of resilient members; one end of each elastic piece is connected with the roller frame, and the other end of each elastic piece is connected with the roller so as to drive the roller to reciprocate in the radial direction of the hose.

Preferably, the elastic member includes a spring or an elastic rod.

Preferably, the elastic mechanism includes an elastic table provided in the pump housing; the elastic table is positioned on one side, opposite to the roller assembly, of the hose so as to apply elastic force to the hose when the squeezing mechanism squeezes the hose.

Preferably, a guide assembly for guiding the roller to reciprocate in the radial direction of the hose is arranged on the roller frame corresponding to the roller.

Preferably, the guide assembly includes a first guide groove disposed on the roller frame and provided for the rotation shaft of the roller to penetrate through with the roller.

Preferably, the guide assembly comprises a guide bracket arranged on the periphery of the roller frame and extending towards the inner side wall direction of the pump shell;

the guide bracket comprises a first bracket body and a second bracket body matched with the first bracket body; the inner sides of the first frame body and the second frame body are respectively provided with a second guide groove for guiding the roller by penetrating through two ends of a rotating shaft of the roller.

Preferably, the resilient means comprises a resilient ball;

the extrusion mechanism comprises a transmission assembly connected with the driving assembly and the roller assembly; the transmission assembly comprises a first transmission wheel and a second transmission wheel which are arranged at two sides of the elastic ball, and a transmission belt which is sleeved on the first transmission wheel and the second transmission wheel and elastically abutted against the elastic ball;

the driving assembly is connected with the first driving wheel;

the roller assembly comprises a plurality of rollers which are arranged on the transmission belt at intervals.

The peristaltic pump has the following beneficial effects: this peristaltic pump is through setting up elastic mechanism in the pump case, and then the distance between adjustable wheel components and the hose to can avoid the hose wearing and tearing and can't use, the life of extension hose. The peristaltic pump has the advantages of long service life, small pulse, high precision, simple structure and miniaturization.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic structural view of a first embodiment of a peristaltic pump of the present invention;

FIG. 2 is a schematic structural view of a second embodiment of the peristaltic pump of the present invention;

FIG. 3 is a schematic structural view of a third embodiment of the peristaltic pump of the present invention;

FIG. 4 is a schematic structural view of a fourth embodiment of the peristaltic pump of the present invention;

FIG. 5 is a schematic structural view of a fifth embodiment of the peristaltic pump of the present invention;

wherein the pump housing 10; a hose 20; an elastic mechanism 30; a support table 31; a spring 32; a pressing mechanism 40; a roller assembly 41; a roller frame 411; the first guide groove 411; a roller 412; a drive assembly 42; a connecting bracket 43; a drive assembly 44; a first driving wheel 441; a second transmission wheel 442; a belt 443; and a guide bracket 50.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Figure 1 shows a first embodiment of the peristaltic pump of the invention. The peristaltic pump has the characteristics of long service life, automatic adjustment, high precision and small pulse.

As shown in fig. 1, in the present embodiment, the peristaltic pump may include a pump housing 10, an elastic mechanism 30, and a pressing mechanism 40. The pump housing 10 can be used for the hose 20 to pass through, and the elastic mechanism 30 can be disposed in the pump housing 10, which can facilitate the extrusion mechanism 40 to adjust the distance between the extrusion mechanism 40 and the hose 40. The squeezing mechanism 40 is rotatably disposed in the pump housing 10, and is used to squeeze the hose 20, thereby facilitating the fluid delivery.

Further, in the present embodiment, the pump housing 10 may be a hollow structure, and an inner side thereof may form a receiving cavity for receiving the elastic mechanism 30 and the pressing mechanism 40. The pump casing 10 may include a bottom wall, two first side walls disposed on the bottom wall and opposing each other, and two second side walls disposed on the bottom wall and opposing each other and located between the two first side walls. The two opposite sides of the pump housing 10 may be provided with through holes, which may be located on the two first sidewalls, and which may be used for the hose 20 to pass through. In this embodiment, a hose mounting groove may be provided on the pump housing 10, and the hose mounting groove may be provided on the bottom wall, which may be used for mounting the hose 20.

Further, in this embodiment, the hose 20 can be used for conveying liquid, gas and solid mixture, and the material used can be one or more of silicone rubber, polytetrafluoroethylene and synthetic material. The hose 20 can be linearly arranged in the pump housing 10, and does not need any bending, thereby reducing the loss of the hose, prolonging the service life of the peristaltic pump, and simultaneously ensuring the characteristics of simple operation and wide application range.

Further, in this embodiment, the elastic mechanism 30 may be connected to the squeezing mechanism 40, and when the squeezing mechanism 40 squeezes the hose, the elastic force generated by the contraction balances the force of the hose on the squeezing mechanism 40, and when the hose 20 is worn, the squeezing mechanism 40 still squeezes the hose 20 due to the elastic force of the elastic mechanism 30, and the gap between the squeezing mechanism 40 and the hose 20 may be automatically compensated, so that the automatic adjustment may be realized. In this embodiment, the elastic mechanism 30 may be an elastic ball. It will be appreciated that in other embodiments, the resilient mechanism 30 may not be limited to a resilient ball, which may be a spring, a resilient rod, a rubber device, or a resilient plastic device.

Further, in the present embodiment, the pressing mechanism 40 may include a roller assembly 41, and a driving assembly 42. The roller assembly 41 may be mounted in the pump housing 10, which is connected to the driving assembly 42. The driving assembly 42 can be disposed outside the pump housing 10, and can penetrate into the pump housing 10 to connect with the roller assembly 41, which can drive the roller assembly 41 to rotate, so as to drive the roller assembly 41 to squeeze the hose 20. The elastic mechanism 30 can be used for adjusting the distance between the roller assembly 41 and the hose 40, so that the distance can be automatically adjusted, the adjustment efficiency can be improved, other mechanisms do not need to be additionally added, and the characteristics of simple structure and miniaturization of the peristaltic pump are ensured.

Further, in the present embodiment, the roller assembly 41 may include a roller frame 411 and a plurality of rollers 412. The roller frame 411 is rotatably disposed on the pump housing 10, specifically, rotatably disposed on the second sidewall of the pump 10, and the roller frame 411 may be in a disc shape, and may be connected to the driving component 42, and may be driven by the driving component 42 to rotate. The elastic mechanism 30 can be disposed on the roller frame 411, and specifically, the elastic ball can be located in the middle of the roller frame 411, and the central axis thereof can coincide with the central axis of the roller frame 411. The rollers 412 may be disposed on the roller frame 411, and may be disposed at equal intervals along the circumference of the roller frame 411, and may be respectively located at the periphery of the elastic ball, and abut against the elastic ball to be driven by the elastic ball to reciprocate along the radial direction of the elastic ball, so as to extrude the hose 20 in the radial direction of the hose 20.

Further, in this embodiment, the roller frame 411 may include two frame bodies disposed opposite to each other and connected to each other, and a receiving space is disposed between the two frame bodies. The elastic ball and the roller can be erected between the two shelf bodies. The roller frame 411 may be provided with a guiding assembly, and specifically, the two frame bodies are provided with guiding assemblies. The guide member may be provided in correspondence with the roller 412, and may serve to guide the roller 412 in a reciprocating motion in a radial direction of the hose 20. In this embodiment, the guide assembly may include a first guide groove 4111 disposed on the roller frame 411, and the first guide groove 411 may be disposed in a radial direction of the roller frame 411, and may be a strip-shaped groove. The rotation shaft of the roller 412 can be disposed on the first guiding slot 411, and can be driven by the elastic mechanism 30 to reciprocate along the first guiding slot 411. Specifically, in the present embodiment, two ends of the rotating shaft of the roller 412 can respectively penetrate through the correspondingly disposed first guiding slots 411 on the two shelf bodies.

Further, in this embodiment, the radial dimension of the roller 412 can be larger than the maximum outer diameter of the hose, thereby effectively squeezing the hose 20. In the present embodiment, the plurality of rollers 412 can be eight rollers, and the eight rollers 412 can be circumferentially distributed, but it is understood that in other embodiments, the rollers can be uniformly distributed along a rectangle or an ellipse. The roller 412 can rotate around the center of the roller frame 411 when the roller frame 411 rotates, in this embodiment, the roller 412 can also rotate by itself, the roller 412 can include a wheel body and a rotating shaft penetrating through the wheel body, the rotating shaft can be connected with the roller frame 411, and the wheel body can rotate around the rotating shaft. The roller 42 is arranged around the center of the roller frame 411 in a revolving manner and arranged around the rotation axis of the roller, so that the roller 412 is ensured to be more stable and smooth when the hose 20 is extruded, and the generation of pulses is reduced. By uniformly arranging the rollers 412 on the roller frame 411 and connecting the rollers with the elastic ball, the same liquid amount of the extrusion hose 20 every time can be ensured, and the high-precision requirement of the peristaltic pump is realized. It is understood that, at the position where the roller 412 contacts the hose 20, a protective sleeve, such as a silicone protective sleeve, a plastic protective sleeve, etc., may be further provided to avoid unnecessary abrasion of the hose 20 by the roller 412.

Further, in this embodiment, the driving component 42 may be a driving motor, which is installed outside the pump housing 10, and an output shaft thereof can be disposed through the pump housing 10, and the output shaft thereof can be connected with the center of the roller frame 411 to drive the roller frame 411 to rotate. Of course, it will be appreciated that in other embodiments, the drive assembly 42 is not limited to only including a drive motor, but may also include a drive gear. The driving gear can be sleeved on an output shaft of the driving motor and can be driven by the driving motor to rotate. The roller carrier 411 can also be provided with a transmission gear set; the transmission gear set is a planet gear which can be meshed with the driving gear and can be driven by the driving gear to rotate, and then the gear 411 can be driven to rotate. It will be appreciated that in other embodiments, the drive assembly is not limited to being motor driven, and may be hydraulically or electrically driven, such as a rotary cylinder.

When the peristaltic pump is used, the hose 20 can be disposed below the roller 412, and the distance from the hose 20 to the axis of the roller frame 411 is smaller than the maximum distance from the roller 412 to the axis of the roller frame 411, so that the hose can be fixed in the pump housing 11 and cannot move freely. The driving motor drives the roller frame to make a circular motion around the axis thereof through the output shaft, and further drives the roller 412 on the roller frame 411 to rotate, and the roller 412 extrudes the hose 20 along the first guiding groove 4111 and in a reciprocating motion in the radial direction of the hose 20 under the elastic force of the elastic ball, thereby realizing liquid delivery. Since the hose 20 is fixed in the pump housing 10, the roller 412 pressed by the hose 20 in the radial direction moves along the first guide slot 411 of the roller frame 411 toward the axial center of the roller frame 411, and can press the elastic ball until the elastic ball is balanced with the roller 412. When the roller 412 rotates away from the hose 20 and is no longer squeezed, the roller 412 is returned to the original state by the elastic force of the elastic ball.

When the peristaltic pump is worn after a long time use, the distance between the hose 20 and the axis of the roller frame 411 is increased, and the rollers 412 can still fully press the hose 20 due to the existence of the elastic balls, so that the service life of the peristaltic pump is prolonged. This embodiment does not require manual adjustment of the relative position between the hose 20 and the roller 412, and it enables automatic adjustment, as the hose 20 wears, to automatically compensate for the distance between the hose 20 and the roller 412. The roller 412 can revolve along with the roller frame and also can rotate around the rotating shaft of the roller, when the roller extrudes the hose 20 and the elastic ball, only rolling friction is generated, sliding friction is not generated, further, the abrasion of the hose 20 and the elastic ball can be greatly reduced, the service life of the peristaltic pump is prolonged, the same amount of liquid conveyed by extruding the hose 20 every time is ensured, and the precision of the peristaltic pump is increased. Meanwhile, the design of the elastic ball can enable the roller 412 to slowly move when beginning to extrude the hose 20 and leave the hose 20, so that the pumping liquid is ensured to be more stable and smooth, the generation of pulses is reduced, and the peristaltic pump has a simple and compact structure, can realize a miniaturized design, is low in cost and is convenient to popularize.

The peristaltic pump of this embodiment has the following advantages:

1. the service life is long. The distance between the elastic mechanism automatic adjustment hose and the roller component is designed, the automatic and accurate adjustment function is realized, the hose penetrates through the pump shell, the pump shell can be designed linearly, any bending is not needed, the loss of the hose is reduced, the service life of the peristaltic pump is prolonged, and the characteristics of simplicity in operation and wide application range are ensured.

2. The pulse is small, and the precision is high. The driving assembly is designed to drive the roller to revolve around the circle center of the roller assembly and rotate around the axis of the roller, so that the roller is more stable and smooth when extruding a hose, and the generation of pulses is reduced. The rollers are uniformly arranged and connected with the elastic mechanism, so that the same liquid amount of the hose pump is guaranteed to be extruded every time, and the high-precision requirement of the peristaltic pump is met.

Figure 2 shows a second embodiment of the peristaltic pump of the invention. The roller frame 411 may be omitted. The roller 412 may be provided with a connecting bracket 43. The pressing mechanism 40 may include a drive assembly 44; the drive assembly 44 may be disposed within the pump housing 10. Can be connected with the driving component 42 and the roller component 41, and can be driven by the driving component 42 to rotate, so as to drive the roller component 41 to rotate.

In this embodiment, the transmission assembly 44 may include a first transmission wheel 441, a second transmission wheel 442 and a transmission belt 443. The first driving wheel 441 and the second driving wheel 442 are disposed at intervals and are respectively located at two sides of the elastic ball. The first driving wheel 441 can be connected to the driving assembly 42, and specifically, in this embodiment, the first driving wheel 441 is a driving wheel, and an output shaft of the driving motor can be disposed on the first driving wheel 441 to drive the first driving wheel 441 to rotate. The second driving wheel 442 can be a driven wheel, which can be driven by the first driving wheel 441 to rotate through the driving belt 443. In this embodiment, the axis connecting line of the first driving wheel 441 and the second driving wheel 41 is parallel to the hose 20. The transmission belt 443 can be sleeved on the first transmission wheel 441 and the second transmission wheel 442, and can be elastically abutted against the elastic ball. In this embodiment, the belt may alternatively be a belt. Opposite sides of the resilient ball may abut the belt 443, which may apply a resilient force to the belt 443. In this embodiment, the rollers 412 of the roller assembly 41 may be disposed on the belt 443 at intervals. The plurality of rollers 412 are disposed equidistantly. In this embodiment, the roller 412 can be connected and fixed to the belt 433 through the connecting bracket 43.

When the peristaltic pump is used, the hose 20 can be installed in the pump housing 10 through a hose installation groove, and the distance from the hose installation groove to the axis of the first driving wheel 441 is smaller than the maximum distance from the roller 412 to the axis of the first driving wheel 441. The driving motor drives the first driving wheel 441 to rotate, and the first driving wheel 441 can drive the driving belt 443 to rotate, so that the roller 412 rotates along with the driving belt 443 and presses the hose 20 to realize liquid delivery. The driving belt 443 is protruded outward by the elastic force of the elastic balls. At this time, the distance from the roller 412 to the axis connecting line between the first transmission wheel 441 and the second transmission wheel 442 is the largest. When the roller 412 extrudes the hose 20, the distance from the three rollers 412 extruding the hose 20 to the axis connecting line of the first driving wheel 441 and the second driving wheel 442 is equal under the reaction force of the hose 20, so that the liquid conveying amount is always the same every time, and the liquid pumping precision of the peristaltic pump is improved. When the hose 20 is worn, the transmission belt 443 protrudes outwards under the action of the elastic balls to compensate the wear of the hose 20, so that the relative distance between the hose 20 and the roller 412 is kept unchanged all the time, and the service life of the peristaltic pump is prolonged.

Fig. 3 shows a third embodiment of the peristaltic pump of the invention, which differs from the first embodiment in that the first guide groove 4111 can be omitted. The resilient mechanism 30 is a resilient table. The elastic platform can be disposed in the pump housing 10 and located on the side of the hose 20 opposite to the roller assembly 41. The hose 20 can be laid in a straight line on the elastic table. When the pressing mechanism 40 presses the flexible tube 20, the elastic force platform can apply elastic force to the flexible tube 20, so as to adjust the distance between the flexible tube 20 and the roller assembly 41. In this embodiment, the elastic table may include a support base 31 and a spring 32 having one end connected to the support base 31 and the other end connected to the bottom wall of the pump housing 10.

When in use, the roller frame 411 is driven by the driving motor to rotate, the roller 412 rotates along with the roller frame 411, and when the hose 20 contacts with the roller frame, the elastic platform exerts elastic force to cooperate with the roller 412 to extrude the hose 20. When the hose 20 is worn, the hose 20 is always kept opposite to the roller 412 under the support of the elastic table, and the service life of the peristaltic pump is prolonged. The design structure is simple and easy to realize, the cost is low, and the wide popularization and use are convenient.

Fig. 4 shows a fourth embodiment of the peristaltic pump of the present invention. The difference from the first embodiment is that the elastic mechanism 30 is an elastic member, which may be a plurality of elastic members, and each of the elastic members has one end connected to the roller frame 411 and the other end connected to the roller 412, which drives the roller 412 to reciprocate in the radial direction of the hose 20. Specifically, the elastic member may be a spring, and the spring may be disposed on the outer circumference of the roller frame 411.

In this embodiment, the first guiding groove 4111 may be omitted. The guide assembly includes a guide bracket 50. The guide bracket 50 may be disposed at the outer circumference of the roller frame 411 and extend toward the inner sidewall of the pump housing 10. The guiding bracket 50 may be a plurality of brackets, which may be disposed corresponding to the plurality of rollers 412 one by one, and which may guide the movement of the rollers 412. In this embodiment, the guiding bracket 50 may include a first frame and a second frame; the first frame body can be matched with the second frame body, the first frame body and the second frame body can be arranged at intervals and oppositely, and one end of the first frame body and one end of the second frame body can be connected and fixed on the roller carrier 411. Further, in this embodiment, this first support body and this second support body can be the lath, and this first support body and second support body inboard can set up the second guide way respectively. The second guide groove may be a strip groove, which may be disposed in the length direction of the first frame body and the second frame body. Both ends of the rotating shaft of the roller 412 can respectively penetrate through the second guiding groove and can slide in the second guiding groove, so as to guide the roller 412, reduce the friction between the roller 412 and the guiding bracket 50, and realize that the roller 412 can flexibly slide on the guiding bracket 50.

When the peristaltic pump is used, the hose 20 is inserted into the pump housing 10 and is disposed in the mounting groove of the pump housing 10, and the distance from the hose 20 to the center of the roller frame 411 is smaller than the distance from the roller 412 to the center of the roller frame 411. One end of the spring is fixedly connected to the roller frame 411, and the other end is rotatably connected to the shaft of the roller 412. The driving motor is started to drive the roller frame 411 to rotate, so as to drive the roller 412 to rotate, further extrude the hose 20 and output the pump liquid. When the driving motor drives the roller frame 411 to rotate around the rotating shaft thereof, the roller frame 411 drives the guide bracket 50 and the spring to rotate around the circle thereof, and the roller 412 rotates along with the guide bracket 50, thereby realizing the extrusion of the roller 412 on the hose 20. The spring is in a natural extension when the roller 412 is not pressing the hose 20. When the roller 412 presses the hose 20, the spring is gradually compressed, thereby applying an elastic force to the roller 412. The roller 412 is gradually moved away from the hose 20 and the spring gradually returns to its natural extension when the hose is no longer compressed.

In this embodiment, when the roller 412 rotates clockwise around the center of the circle, the roller 412 presses the liquid in the hose 20 to flow from right to left. When the hose 20 is worn for a long time and the distance from the hose 20 to the center of the circle is increased, the distance from the roller 412 to the center of the circle when the hose is extruded can be increased under the action force of the spring, so that the hose 20 can be normally extruded by the roller 412 under the condition that the hose 20 is worn, and the normal operation of pumping liquid is ensured. By adopting the design, the distance between the hose 20 and the roller 412 can be automatically adjusted, manual adjustment is not needed, the adjustment is accurate, and the service life of the peristaltic pump is prolonged. The roller 412 is designed to revolve around the center of the roller frame 411 and to rotate around its own axis. When the roller 412 and the hose 20 are extruded, rolling extrusion is generated instead of friction extrusion, so that the abrasion of the roller 412 to the hose 20 is reduced, the service life of the peristaltic pump is prolonged, the same pump liquid amount is ensured when the hose 20 is extruded every time, and the precision of the peristaltic pump is increased. Meanwhile, the roller 412 connected with the spring is designed to ensure that the roller 412 is more stable and smooth when extruding the hose, and the generation of pulses is reduced.

Fig. 5 shows a fifth embodiment of the invention, which differs from the first embodiment in that the resilient means 30 may be a resilient lever. The guide bracket 50 may be omitted. The spring bar may replace the spring and guide bracket 50. One end of the elastic rod can be connected with the roller frame 411, and the other end can be connected with the roller 412, and the roller 412 can rotate around the center of the roller frame 411 along with the roller frame 411 or can rotate around the rotation shaft of the roller 412. When the peristaltic pump is used, the roller 412 can extrude the hose 20 under the driving of the driving motor, and the distance between the roller 412 and the hose can be ensured to be a certain value under the action of the elastic rod, so that the service life of the peristaltic pump is prolonged. The embodiment has the advantages of simple structure, easy miniaturization, low cost and convenient popularization and application.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.