Telescopic peristaltic pump head and peristaltic pump

Abstract

The utility model discloses a telescopic peristaltic pump head which comprises a fixed seat, a main shaft penetrating through the fixed seat, a rotating cover connected to one end of the main shaft, a telescopic arm and a roller, the telescopic arm and the roller are jointly arranged around the periphery of the fixed seat, and the roller is rotatably arranged at the outer end of the telescopic arm. A set of sliding grooves extending from inside to outside are formed in the peripheral wall of the fixing base, the telescopic arms are embedded in the sliding grooves in a sliding mode, a set of guide holes corresponding to the telescopic arms in a one-to-one mode are formed in the rotating cover, and the extending directions of the guide holes are different from the extending directions of the sliding grooves. The end of the inner side of each telescopic arm is provided with a connecting column protruding towards the rotary cover, the connecting columns are clamped in the guide holes one by one in a sliding mode, and the main shaft drives the rotary cover to rotate. According to the scheme, the telescopic roller is arranged to change the outer diameter of the peristaltic pump head, so that installation is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a telescopic peristaltic pump head and peristaltic pump. BACKGROUND

[0002] As disclosed in the publication number CN 111456930 A, the peristaltic pump is used for the transmission of liquid or solid-liquid mixture, and the principle is to continuously compress and release the elastic hose through the internal rotor to achieve the purpose of transmitting liquid or solid-liquid mixture. The peristaltic pump has many different applications, and due to its non-contact between the pump head and the fluid in the pipe, it can ensure the cleanliness of the transmitted fluid, so the peristaltic pump has a wide application in the medical field, such as the suction and / or perfusion of fluid in ophthalmic surgery.

[0003] The peristaltic pump generally includes a rigid shell, a pump head (i.e. a rotor) and a pump pipe. In order to make the peristaltic pump move the fluid in the pipe by rotating and extruding a section of hose, the pump pipe is generally installed between the rigid shell and the peristaltic pump head. In order to make the fluid in the pump pipe flow in a specified direction, the gap between the peristaltic pump head and the shell is generally smaller than the diameter of the pump pipe. In order to generate a certain pressure (positive pressure or negative pressure) in the pump pipe, the gap between the peristaltic pump head and the shell is generally not more than twice the wall thickness of the pump pipe. Therefore, the gap for installing the pump pipe is very narrow, and the pump pipe needs to be pressed into the gap during installation, which makes the installation of the pump pipe very inconvenient. At the same time, the pump pipe is an elastic pipe made of soft material, and the pump head and the shell are generally made of hard material, which makes the pump pipe prone to twisting or bending during installation, and even causes the pump pipe to be worn due to improper installation, which increases the risk of use and shortens the service life. SUMMARY

[0004] The utility model aims at overcoming the defects of the prior art and providing a telescopic peristaltic pump head and peristaltic pump.

[0005] The utility model realizes the purpose by the following technical scheme:

[0006] The application discloses a telescopic peristaltic pump head, which comprises a fixed base, a main shaft penetrating through the fixed base, a rotating cover connected to one end of the main shaft, a plurality of telescopic arms and rollers, the telescopic arms are arranged around the outer periphery of the fixed base, the rollers are rotatably arranged at the outer ends of the telescopic arms, a plurality of sliding grooves extending from inside to outside are arranged on the outer periphery wall of the fixed base, the telescopic arms are slidably arranged in the sliding grooves, a plurality of guide holes corresponding to the telescopic arms are arranged on the rotating cover, the extension direction of the guide holes is different from the extension direction of the sliding grooves, the inner end of each telescopic arm is provided with a connecting column protruding towards the rotating cover, the connecting column is slidably arranged in one of the guide holes, the main shaft drives the rotating cover to rotate, when the rotating cover rotates, the guide hole limits the sliding of the connecting column along the hole wall, the connecting column drives the telescopic arm to slide along the sliding groove, so that the rotating cover drives a plurality of telescopic arms to synchronously extend or retract relative to the fixed base through rotation.

[0007] Preferably, the guide hole is a non-straight extending through hole, and at least the outer end of the through hole forms a dead point position of the connecting column.

[0008] Preferably, the guide hole is an arc-shaped hole extending in a circular arc shape, and the dead point position is located on one side of the guide hole.

[0009] Preferably, the guide hole is an L-shaped hole extending in an L shape, the inner end of the L-shaped hole extending towards the axis of the rotating cover and the vertical bending point have a spacing greater than the spacing between the outer end of the L-shaped hole extending towards the outer edge of the rotating cover and the vertical bending point, and the outer end is the dead point position of the connecting column.

[0010] Preferably, the guide hole is a J-shaped hole extending in a J shape, the inner end of the J-shaped hole extending towards the axis of the rotating cover and the arc-shaped bending point have a spacing greater than the spacing between the outer end of the J-shaped hole extending towards the outer edge of the rotating cover and the arc-shaped bending point, and the outer end is the dead point position of the connecting column.

[0011] Preferably, the guide hole is a straight extending through hole.

[0012] Preferably, the axis of the rotating cover has a connecting hole matched with the end of the main shaft, and the connecting hole is non-circular.

[0013] Preferably, the guide hole is composed of a straight extending through hole and a non-straight extending through hole, and at least one end of the through hole forms a dead point position of the connecting column.

[0014] Preferably, the roller includes a roller housing, bearings, washers, and a roller shaft. Two bearings are secured at both ends of the roller housing. The roller shaft passes through the roller housing and bearings in sequence. Both ends of the roller shaft are fixed to the outer ends of the telescopic arm. The washers are fitted onto the roller shaft and located between the telescopic arm and the inner ring of the bearing.

[0015] A peristaltic pump includes a housing, a pump tube, and a retractable peristaltic pump head as described above, wherein the peristaltic pump head is disposed within the housing, and the pump tube is disposed within the gap between the peristaltic pump head and the housing.

[0016] The beneficial effects of this utility model are mainly reflected in:

[0017] 1. The roller is slidably connected to the fixed seat via a telescopic arm. The guide hole on the rotating cover drives the telescopic arm to extend and retract synchronously relative to the fixed seat by rotating the cover, thereby changing the overall outer diameter of the peristaltic pump head. During installation, the telescopic arm is first driven to retract to the fixed seat to minimize the outer diameter of the pump head, increasing the gap between the pump head and the housing to facilitate the installation of the pump tube. After the pump tube is installed, the rotating cover is rotated to drive the telescopic arm to extend synchronously from the fixed seat, causing the roller to squeeze the pump tube to meet the usage requirements. This greatly simplifies the installation of the peristaltic pump, reduces the difficulty of installing the pump tube, and allows for adjustment of the degree of squeezing of the pump tube by the roller, improving the accuracy of the peristaltic pump. It also expands the application range of the peristaltic pump, as it can be adapted to pump tubes of different diameters.

[0018] 2. A guide hole is provided on the rotating cover to drive the telescopic arm to move. The guide hole has various embodiments to choose from to adapt to different usage requirements. The straight-extending guide hole has at least one dead point at its extended end to limit the connecting column, thereby limiting the relative position between the rotating cover and the connecting column. This prevents relative displacement between the rotating cover and the connecting column, so that during the use of the peristaltic pump, the connecting column will not move in the opposite direction due to the fluid flow inside the pump tube. That is, the roller will not be squeezed back by the pump tube, causing excessive fluctuations in the flow of fluid inside the pump tube, thus ensuring the stability of the roller position during use. Attached Figure Description

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0020] Figure 1 : Schematic diagram of an explosion of a peristaltic pump head;

[0021] Figure 2 Assembly diagram of peristaltic pump head;

[0022] Figure 3 : Schematic diagram of the rollers in the contracted state of a peristaltic pump head;

[0023] Figure 4 : schematic view of the roller in the extended state in a peristaltic pump head;

[0024] Figure 5 : schematic view of a first embodiment of a rotating cap;

[0025] Figure 6 : schematic view of a second embodiment of a rotating cap;

[0026] Figure 7 : schematic view of a third embodiment of a rotating cap;

[0027] Figure 8 : schematic view of a fourth embodiment of a rotating cap;

[0028] Figure 9 : schematic view of a non-contact state during the extension of the roller;

[0029] Figure 10 : schematic view of a starting compression state during the extension of the roller;

[0030] Figure 11 : schematic view of an initial compression state during the extension of the roller;

[0031] Figure 12 : schematic view of an over-compression state during the extension of the roller;

[0032] Figure 13 : schematic view of an end compression state during the extension of the roller. DETAILED DESCRIPTION

[0033] The utility model will be described in detail below in combination with the specific embodiments shown in the drawings. However, these embodiments are not limited to the utility model, and the changes in structure, method or function made by those skilled in the art based on these embodiments are also included in the protection scope of the utility model.

[0034] In the description of the scheme, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, structure and operation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, the operator is taken as the reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0035] As Figures 1 to 8As shown, the utility model discloses a telescopic peristaltic pump head, including fixed seat 1, the main shaft 2 of the fixed seat 1, the rotation cover 3 of the main shaft 2 one end, a set of common ring the fixed seat 1 outer periphery setting telescopic arm 4 and roller 5, the roller 5 rotatably be provided in the outer end of telescopic arm 4, the outer periphery wall of fixed seat 1 all be equipped with a set of from inside to outside extension's sliding groove 101, telescopic arm 4 slidingly embedded in the sliding groove 101, rotation cover 3 is provided with a set of with telescopic arm 4 one to one corresponding guide hole 301, and the extension direction of guide hole 301 with the extension direction of sliding groove 101 is different, and the inner side end of each telescopic arm 4 all has the connecting column 401 that protrudes towards rotation cover 3, connecting column 401 is slidably clamped in one guide hole 301, the main shaft 2 drives rotation cover 3 rotates, when rotation cover 3 rotates, guide hole 301 limits connecting column 401 along its hole wall sliding, connecting column 401 drives telescopic arm 4 along sliding groove 101 sliding, so that rotation cover 3 drives a set of telescopic arm 4 by rotating and synchronously extends or retracts relative to fixed seat 1.

[0036] Specifically as Figure 1 As shown, the outer periphery wall of fixed seat 1 all is equipped with a set of from its axis to its outer periphery wall radial straight extension's sliding groove 101, a set of the inner side of telescopic arm 4 is slidably embedded in the sliding groove 101, and the outer side of each telescopic arm 4 rotatably is provided with a roller 5, the main shaft 2 rotatably passes in the central axis hole 102 of fixed seat 1, the end of main shaft 2 is fixedly connected with the axis of rotation cover 3 and drives rotation cover 3 synchronous rotation, rotation cover 3 is all equipped with a set of guide holes 301 periphery, the inner side top end of telescopic arm 4 has an outwardly convex connecting column 401, each connecting column 401 is slidably clamped in guide hole 301, the extension direction of guide hole 301 with the extension direction of sliding groove 101 does not be in the same straight line, when guide hole 301 drives connecting column 401 along its hole wall sliding, telescopic arm 4 synchronously extends sliding groove 101, so that rotation cover 3 drives a set of telescopic arm 4 by rotating and synchronously extends or retracts relative to fixed seat 1.

[0037] In this design, the roller 5 is slidably connected to the fixed base 1 via the telescopic arm 4. The guide hole 301 on the rotating cover 3 is used to synchronously drive the telescopic arm 4 to extend and retract relative to the fixed base 1 by rotating the cover 3, thereby changing the overall outer diameter of the peristaltic pump head. During installation, the telescopic arm 4 is first driven to retract into the fixed base 1 to minimize the outer diameter of the peristaltic pump head, increasing the gap between the pump head and the housing to facilitate pump tube installation. After the pump tube is installed, the rotating cover 3 is rotated to drive the telescopic arm 4 to extend synchronously out of the fixed base 1, causing the roller 5 to compress the pump tube to meet usage requirements. This greatly simplifies the installation of the peristaltic pump, reduces the difficulty of pump tube installation, and allows for adjustment of the degree of compression by the roller 5 on the pump tube, improving the accuracy of the peristaltic pump. It also expands the application range of the peristaltic pump, adapting to pump tubes of different diameters.

[0038] The guide hole 301 in this solution has at least four feasible embodiments for selection to meet different usage requirements.

[0039] like Figure 5 The diagram shows a first embodiment of the guide hole 301. In this first embodiment, the guide hole 301 is a straight, extending through hole, with its end walls forming arc surfaces that match the outer wall of the connecting post 401, thereby reducing unnecessary friction between the connecting post 401 and the guide hole 301. In this first embodiment, the straight, extending guide hole 301 maximizes the smoothness of the sliding of the connecting post 401, allowing the roller 5 to extend or retract quickly.

[0040] Furthermore, the guide hole 301 can also be a non-straight extending through hole, and at least its outer end forms a dead point position that can limit the position of the connecting post 401, thereby limiting the position of the connecting post 401 and avoiding relative displacement between the connecting post 401 and the rotating cover 3 in the use state, so that the rotating cover 3 can only be driven to rotate by the main shaft 2, wherein the main shaft 2 is a motor shaft connected to a drive motor (not shown in the figure).

[0041] The dead point, also known as the over-compression point, is structurally designed as follows: After the peristaltic pump expands and extends, each roller 5 exerts pressure on the pump tube, thus experiencing a radial inward compressive force from the pump tube. At this point, the angle α formed by the retraction trajectory of the roller 5 and the applied compressive force is ≥90°, thus creating a mechanical dead point. Theoretically, no matter how large the compressive force, it is impossible to push the roller back. In practice, especially when the peristaltic pump is rotating in reverse, to prevent external interference such as vibration and human contact, the angle α is generally preferably greater than 90°, and the larger α is, the more stable the extended state. However, the larger the angle α is, the greater the torque required for extension and retraction. Therefore, the specific value of the angle α is set according to the motor torque.

[0042] Specifically, as shown in Figures 1-3 and Figure 6 , it is the second embodiment of the guide hole 401, which is also the optimal embodiment. In the second embodiment, the guide hole 301 is an arc-shaped hole extending in a circular arc shape, and the dead point position is located at one side of the arc-shaped hole. Preferably, the dead point position is located at the outer side of the arc-shaped hole and is located at the farthest distance from the center of the rotating cover 3 to limit the retraction of the connecting column 401. The guide hole 301 extends in a circular arc shape, and the dead point position is the farthest distance point of the outward translation of the connecting column 401, that is, when the connecting column 401 moves to the dead point position, the telescopic arm 4 extends to the maximum distance, and the outer diameter of the peristaltic pump head is the maximum. When the connecting column 401 moves to the outer end of the guide hole 401, due to the arc structure of the guide hole 301, the connecting column 401 will produce a certain retraction in the straight line distance, that is, the telescopic arm 4 slightly retracts the chute 101, and at this time, due to the existence of the dead point position, the rotating cover 3 can limit the final position of the connecting column 401, and when the rotating cover 3 does not rotate, the connecting column 401 is limited in the arc-shaped hole and will not be pressed and retracted by the fluid flow in the pump tube, so as to ensure the stability of the roller 5 position in the use state of the peristaltic pump, thereby avoiding the retraction of the roller 5 due to vibration, pump tube extrusion or other uncertain factors, ensuring the stability of the pump tube internal pressure generated by the roller 5 extruding the pump tube, and reducing the large fluctuation caused by the movement of the roller 5, ensuring the constancy of the fluid flow pressure in the pump tube and reducing the fluctuation.

[0043] Similarly, as shown in Figure 7 , it is the third embodiment of the guide hole 301. In the third embodiment, the guide hole 301 is an L-shaped hole extending in an L shape, which has a vertical bending point 3011, and the distance between the inner end extending towards the axis of the rotating cover 3 and the vertical bending point 3011 is greater than the distance between the outer end extending towards the outer edge of the rotating cover 3 and the vertical bending point 3011, and the outer end can limit the dead point position of the connecting column 401. The working principle of the dead point position of the third embodiment is the same as that of the second embodiment, and the difference between the second embodiment and the third embodiment is that in the third embodiment of the guide hole 301, only the outer end forms the dead point position, and the inner end is similar to the straight extension in the first embodiment, which does not limit the connecting column 401. In this way, the extension of the connecting column 401 needs to limit the rotation direction of the rotating cover 3.

[0044] As shown in Figure 8As shown, the fourth embodiment of the guide hole 301 is different from the third embodiment in that the guide hole 301 is a J-shaped hole extending in a J shape with an arc-shaped bending point 3012, so that the connecting column 401 moves more smoothly, and the distance between the inner end of the guide hole 301 extending to the axis of the rotating cover 3 and the arc-shaped bending point 3012 is greater than the distance between the outer end of the guide hole 301 extending to the outer edge of the rotating cover 3 and the arc-shaped bending point 3012, and the outer end defines the dead point position of the connecting column 401.

[0045] The Figures 5-8 The guide hole 301 is shown as a through hole of a single shape, and in other possible embodiments, the guide hole 301 can also be other shapes that can drive the connecting column 401 to move. Further, the guide hole 301 of the present solution is not limited to a single guide hole structure, and in other possible embodiments, the guide hole 301 can be composed of a combination of straightly extending through holes and non-straightly extending through holes, and at least one end of the through holes defines the dead point position of the connecting column 401. For example, any two or three or four of the first to fourth embodiments can be combined in any manner, such as, but not limited to, a combination of a straight line type through hole and a circular arc type through hole, a straight line type through hole and a J-shaped through hole, a J-shaped through hole and an L-shaped through hole, and the like. In another possible embodiment, the guide hole can also be composed of multiple straight lines or multiple arcs. The straight line inclination angle and the arc radian of the guide hole 301 can be various, and the accompanying drawings show some possible embodiments. Figures 5-8 This is only an example and is not limited.

[0046] Further, in order to ensure the stability and rotation consistency of the connection between the main shaft 2 and the rotating cover 3, the axis of the rotating cover 3 has a connecting hole 302 clamped with the end of the main shaft 2, and the connecting hole 302 is non-circular. In a preferred embodiment, the connecting hole 302 is D-shaped to avoid the rotation of the main shaft 2 relative to the rotating cover 3. In other possible embodiments, the end of the main shaft 2 can also be directly interference-fitted with the axis of the rotating cover 3 to drive the rotating cover 3 to move synchronously.

[0047] As Figure 1As shown, the roller 5 comprises a roller shell 501, bearings 502, a washer 503 and a roller shaft 504, two bearings 502 are clamped at both ends of the roller shell 501, the roller shaft 504 passes through the roller shell 501 and the bearings 502 in turn, and the two ends of the roller shaft 504 are fixedly connected to the outer ends of the telescopic arm 4, wherein the washer 503 is sleeved on the roller shaft 504 and located between the telescopic arm 4 and the inner ring of the bearing 502, so as to avoid unnecessary wear caused by contact between the outer ring of the bearing 502 and the telescopic arm 4.

[0048] The telescopic arm 4 is composed of two connecting plates 402 and a connecting block 403, forming a frame structure to enhance the structural stability and strength of the telescopic arm 4. The inner ends of the two connecting plates 402 are symmetrically fixed to the two ends of the connecting block 403, constituting the inner side of the telescopic arm 4, the inner width of the sliding groove 101 matches the width of the connecting plate 402, so that the inner side of the telescopic arm 4 is slidably embedded in the sliding groove 101, and the two ends of the roller shaft 504 are connected to the outer ends of the two connecting plates 402. The connecting column 401 is fixedly arranged at the inner end top of the connecting plate 402 at the top, and the top port width of the sliding groove 101 is smaller than its inner width, so that the connecting plate 402 is slidably embedded in the sliding groove 101 while the connecting column 401 is slidably arranged in the top port of the sliding groove 101. Such a structure makes the sliding groove 101 limit the telescopic arm 4 in the axial direction, limiting the telescopic arm 4 to only linearly slide inwards or outwards along the sliding groove 101, thereby ensuring the reliability of the extension or retraction of the roller 5 and avoiding the offset of the roller 5 in the axial direction.

[0049] Further, the present scheme also discloses a peristaltic pump, comprising a housing, a pump tube 6 and a telescopic peristaltic pump head as described above, the rotating cover 3 of the telescopic peristaltic pump head is rotatably arranged on part of the end face of the housing, and the pump tube 6 is arranged in the gap between the peristaltic pump head and the housing.

[0050] Specifically, taking the second embodiment of guide hole 301 as an example: During installation, the main shaft 2 drives the rotating cover 3 to rotate clockwise, and the guide hole 301 rotates synchronously to drive the connecting post 401 to slide along its hole wall. Then, the telescopic arm 4 moves linearly along the slide groove 101 until the connecting post 401 moves to the inner end of the guide hole 301. At this time, the telescopic arm 4 retracts into the slide groove 101, the outer diameter of the peristaltic pump head reaches its minimum, and the gap between the peristaltic pump head and the housing reaches its maximum, facilitating the installation of the pump tube 6. After installation, the main shaft 2 drives the rotating cover 3 to rotate counterclockwise, and the connecting post 401 moves in the opposite direction along the guide hole 301 until it reaches the outer end of the guide hole 301. The telescopic arm 4 extends outward, and the roller 5 extends out to compress the pump tube 6 for use.

[0051] Preferably, the guide hole 301 has at least one non-straight extending through hole, so that it has at least one outer end that can define the dead point position of the connecting post 401. The setting of the dead point position allows the roller 5 to have 5 states during the entire extension process: ① No contact state: such as Figure 9 As shown, there is a certain gap between the roller 5 and the pump pipe 6 to facilitate the installation and placement of the pump pipe 6; ② Initial extrusion state: as shown Figure 10 As shown, the peristaltic pump head rotates, and the roller 5 extends radially outward, beginning to contact the pump tube 6; ③ Initial clamping state: as shown Figure 11 As shown, as the peristaltic pump head rotates, the roller 5 continuously extends and squeezes the pump tube 6, reducing the internal gap of the pump tube 6 until it disappears and closes; ④ Over-squeezing state: as shown Figure 12 As shown, the peristaltic pump head continues to rotate, and the roller 5 continues to extend and compress the pump tube 6. The wall of the pump tube 6 is gradually compressed until the maximum compression is reached; ⑤ Final compression state: as shown Figure 13 As shown, the peristaltic pump head continues to rotate, the roller 5 retracts slightly, and the compression of the pump tube 6 decreases slightly, reaching the final set compression amount. This final compressed state not only completely shuts off the fluid in the pump tube 6 but also acts as a lock, preventing the roller 5 from being squeezed back by the pump tube due to vibration or other reasons during operation (forward or reverse rotation). Once the roller 5 has fully extended, the peristaltic pump begins normal operation, the fixed seat 1 loosens, and the drive motor rotates the entire peristaltic pump head. The roller 5 sequentially compresses the pump tube 6, generating pressure and delivering the fluid.

[0052] The retraction process of the peristaltic pump head is the opposite. The drive motor drives the rotating cover 3 to rotate in the opposite direction, which in turn drives the telescopic arm 4 and roller 5 to retract. The process proceeds sequentially from ⑤ final pressing state → ④ over-compression state → ③ initial pressing state → ② starting compression state → ① no contact state. At this time, the peristaltic pump head is not in contact with the pump tube 6, the pump tube 6 can be easily removed, and the peristaltic pump stops working.

[0053] It should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0054] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A retractable peristaltic pump head, characterized in that: The device includes a fixed base (1), a main shaft (2) passing through the fixed base (1), a rotating cover (3) connected to one end of the main shaft (2), a set of telescopic arms (4) and rollers (5) arranged together around the outer periphery of the fixed base (1), the rollers (5) being rotatably disposed at the outer end of the telescopic arms (4), a set of sliding grooves (101) extending from the inside to the outside being provided on the outer periphery of the fixed base (1), the telescopic arms (4) being slidably embedded in the sliding grooves (101), and a set of guide holes (301) corresponding one-to-one with the telescopic arms (4) being provided on the rotating cover (3), and the extending direction of the guide holes (301) being the same as that of the sliding grooves (101) (101, 2, 3, 4, 5, 6, 7, 8, 9, 10 ... 1) The extension directions are different. Each telescopic arm (4) has a connecting post (401) protruding towards the rotating cover (3) at its inner end. The connecting post (401) is slidably locked in a guide hole (301). The main shaft (2) drives the rotating cover (3) to rotate. When the rotating cover (3) rotates, the guide hole (301) limits the connecting post (401) to slide along its hole wall. The connecting post (401) drives the telescopic arm (4) to slide along the slide groove (101) so that the rotating cover (3) drives a group of telescopic arms (4) to extend or retract synchronously relative to the fixed seat (1) by rotating.

2. The retractable peristaltic pump head according to claim 1, characterized in that: The guide hole (301) is a non-straight extending through hole, and at least its outer end forms a dead point position that can define the connecting post (401).

3. The retractable peristaltic pump head according to claim 2, characterized in that: The guide hole (301) is an arc-shaped hole extending in an arc shape, and the dead point is located on one side of the guide hole (301).

4. The retractable peristaltic pump head according to claim 2, characterized in that: The guide hole (301) is an L-shaped hole extending in an L-shape, which has a vertical bend point (3011). The distance between the inner end of the guide hole extending toward the axis of the rotating cover (3) and the vertical bend point (3011) is greater than the distance between the outer end of the guide hole extending toward the outer edge of the rotating cover (3) and the vertical bend point (3011). The outer end is a dead point position that can limit the connecting post (401).

5. The retractable peristaltic pump head according to claim 2, characterized in that: The guide hole (301) is a J-shaped hole extending in a J-shape, which has an arc-shaped bend point (3012). The distance between the inner end of the guide hole extending toward the axis of the rotating cover (3) and the arc-shaped bend point (3012) is greater than the distance between the outer end of the guide hole extending toward the outer edge of the rotating cover (3) and the arc-shaped bend point (3012). The outer end is a dead point position that can limit the connecting post (401).

6. The retractable peristaltic pump head according to claim 1, characterized in that: The guide hole (301) is a straight, extending through hole.

7. The retractable peristaltic pump head according to claim 1, characterized in that: The guide hole (301) is composed of a straight-extending through hole and a non-straight-extending through hole, and at least one of the through holes has an end forming a dead point position that can define the connecting post (401).

8. The retractable peristaltic pump head according to claim 2, 6, or 7, characterized in that: The rotating cover (3) has a connecting hole (302) at its axis that engages with the end of the main shaft (2), and the connecting hole (302) is non-circular.

9. The retractable peristaltic pump head according to claim 8, characterized in that: The roller (5) includes a roller housing (501), a bearing (502), a washer (503), and a roller shaft (504). Two bearings (502) are engaged at both ends of the roller housing (501). The roller shaft (504) passes through the roller housing (501) and the bearings (502) in sequence. Both ends of the roller shaft (504) are fixed to the outer ends of the telescopic arm (4). The washer (503) is sleeved on the roller shaft (504) and located between the telescopic arm (4) and the inner ring of the bearing (502).

10. A peristaltic pump, characterized in that: It includes a housing, a pump tube (6), and a retractable peristaltic pump head as described in any one of claims 1-9, wherein the peristaltic pump head is disposed within the housing, and the pump tube (6) is disposed in the gap between the peristaltic pump head and the housing.

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