Peristaltic pump head and peristaltic pump

Abstract

The present invention provides a peristaltic pump head and a peristaltic pump, which relate to the technical field of liquid pumps, and solve the technical problem that there is an uneven pressure tube gap between the roller and the arc structure of the peristaltic pump with adjustable pressure in the prior art. The device includes a pump head roller group and a pump head top cover, wherein a pressure tube gap is formed between the pump head roller group and the pump head top cover, and the size of the pressure tube gap can be changed by adjusting the position of the pump head roller group or the pump head top cover along the axial direction of the pump head roller group, and the distance values ​​of the pressure tube gaps formed at various locations along the circumferential direction of the pump head roller group are the same. The present invention is used to adjust the pressure tube gap of a peristaltic pump head.

Description

Technical Field

[0001] The invention relates to the technical field of liquid pumps, and in particular to a peristaltic pump head capable of continuously and evenly regulating pressure, and a peristaltic pump having the pump head. Background Art

[0002] The traditional peristaltic pump head pushes the liquid forward by squeezing the hose with a roller, and draws the liquid by relying on the hose's own elasticity. The roller of the traditional peristaltic pump is in the shape of a cylinder, and there is also an arc structure parallel to the roller to form a gap for squeezing the hose; the size of this gap directly determines the thickness of the hose that the pump head can use or the pressure of the peristaltic pump.

[0003] The traditional peristaltic pump pressure regulation is achieved by reducing or increasing the distance between the peristaltic pump roller and the arc structure. The specific method is as follows: Since the size of the arc structure of the traditional peristaltic pump head is fixed, the size of the pump head roller and the relative position of each roller are fixed, the distance between the arc structure and the pump head roller is usually adjusted along the radial direction of the arc structure (see the figure in the specification). Figure 1-Figure 3 ), or select the arc structure to rotate to adjust the distance between the arc structure and the pump head roller (see the figure in the manual). Figure 1 , Figure 4-Figure 5 ).

[0004] The applicant has found that the prior art has at least the following technical problems:

[0005] The traditional peristaltic pump pressure regulation method will cause uneven gap between the peristaltic pump roller and the arc structure, resulting in local overpressure or loose compression of the hose. This regulation method will greatly reduce the life of the hose. In addition, for customers who have high requirements for the precise value of the peristaltic pump pressure, it is sometimes difficult to meet customer needs. Summary of the invention

[0006] The object of the present invention is to provide a peristaltic pump head and a peristaltic pump to solve the technical problem that there is an uneven pressure pipe gap between the roller and the arc structure of the peristaltic pump with adjustable pressure in the prior art. The preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A peristaltic pump head provided by the present invention comprises a pump head roller group and a pump head top cover, wherein a tube compression gap is formed between the pump head roller group and the pump head top cover, and the size of the tube compression gap can be changed by adjusting the position of the pump head roller group or the pump head top cover along the axial direction of the pump head roller group, and the distance values ​​of the tube compression gaps formed at various locations along the circumferential direction of the pump head roller group are the same.

[0009] Optionally or preferably, there is a tube pressing surface on the inner side surface of the pump head top cover, and the tube pressing surface is a conical surface. The outline swept when the pump head roller group rotates is called a scanning surface, and the scanning surface is a conical surface; the axis of the scanning surface is colinear with the axis of the tube pressing surface, and the cone angle of the tube pressing surface is the same as the cone angle of the scanning surface.

[0010] Optionally or preferably, a hose is sandwiched between the pump head roller group and the pump head top cover, the hose is wrapped around the pump head roller group and both ends of the hose are inclined toward the end with a larger diameter of the scanning surface, the surface perpendicular to the axis of the scanning surface is the reference surface, and the inclination angle of the hose relative to the reference surface is the semi-cone angle of the scanning surface.

[0011] Optionally or preferably, the pump head roller assembly comprises a plurality of rollers, the rollers are evenly spaced and distributed along the circumferential direction of the pump head roller assembly, and the outer contour of the rollers is truncated cone-shaped;

[0012] Support plates are respectively arranged at both ends of the pump head roller group, the pin passes through the corresponding roller and both ends are respectively fixed on the support plates on the corresponding side, and the end of the roller protrudes from the edge of the support plate on the corresponding side along the radial direction of the pump head roller group.

[0013] Optionally or preferably, the position of the pump head top cover is adjustable along the axial direction of the pump head roller group; the peristaltic pump head also includes an adjusting screw, which is threadedly connected to the pump head top cover, and the axial direction of the adjusting screw is parallel to the axial direction of the pump head roller group. Rotating the adjusting screw can drive the pump head top cover to move along the axial direction of the pump head roller group.

[0014] Optionally or preferably, the peristaltic pump head includes a nut fixing block, which is detachably connected to the pump head top cover and the nut is limited between the nut fixing block and the pump head top cover, and the adjusting screw passes through the nut to achieve a threaded connection between the adjusting screw and the pump head top cover.

[0015] Optionally or preferably, a placement groove is provided on the pump head top cover, and the nut fixing block is located in the placement groove; a matching groove is provided on the surface of the nut fixing block in contact with the pump head top cover, the adjusting screw passes through the matching groove and the nut is located in the matching groove; the nut is placed upright and the upper and lower two lateral sides of the nut are in contact with the bottom surface of the matching groove and the bottom surface of the placement groove respectively, and the two end faces of the nut are in contact with the corresponding side surfaces of the matching groove respectively.

[0016] Optionally or preferably, the peristaltic pump head also includes an upper front pressure block and an upper rear pressure block, one end of the adjusting screw passes through the upper front pressure block and the pump head top cover and is supported on the upper rear pressure block; a lower front pressure block is arranged below the upper front pressure block and the two are detachably connected, a lower rear pressure block is arranged below the upper rear pressure block and the two are detachably connected, and the pump head roller group is supported between the lower front pressure block and the lower rear pressure block.

[0017] Optionally or preferably, the peristaltic pump head also includes a guide rod, which is arranged on both sides of the adjusting screw, the guide rod passes through the pump head top cover and has two ends respectively connected to the upper front pressure block and the upper rear pressure block, and the axial direction of the guide rod is parallel to the axial direction of the pump head roller group.

[0018] A peristaltic pump comprises the peristaltic pump head.

[0019] The present invention provides a peristaltic pump head, and the pump head top cover can be moved along the axial direction of the pump head roller group, so as to change the relative position between the pump head top cover and the pump head roller group, thereby realizing the adjustment of the size of the compression tube gap between the pump head top cover and the pump head roller group. Moreover, the shape structure of the pump head roller group and the pump head top cover can make the distance values ​​of the compression tube gaps formed at various locations along the circumferential direction of the pump head roller group the same, that is, the compression tube gaps formed at various locations along the circumferential direction of the pump head roller group are uniform, so as to solve the technical problem of uneven compression tube gaps between the roller and the arc structure of the peristaltic pump with adjustable pressure in the prior art.

[0020] The preferred technical solution of the present invention can at least produce the following technical effects:

[0021] There is a tube pressing surface on the inner side of the pump head top cover, which is a conical surface. The outline swept by the pump head roller group when it rotates is called the scanning surface, which is a conical surface. The axis of the scanning surface is collinear with the axis of the tube pressing surface, and the cone angle of the tube pressing surface is the same as the cone angle of the scanning surface, so that the distance values ​​of the tube pressing gaps formed at various locations along the circumferential direction of the pump head roller group are the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the positional relationship between the roller group and the arc structure of the peristaltic pump head in the prior art when in normal use;

[0024] Figure 2 It is a schematic diagram of the positional relationship between the roller group and the arc structure of the peristaltic pump head in the prior art when the gap between the compressed pipe is reduced (the distance between the two is adjusted along the radial direction of the arc structure);

[0025] Figure 3 It is a schematic diagram of the positional relationship between the roller group and the arc structure of the peristaltic pump head in the prior art when the gap between the pressure pipe increases (the distance between the two is adjusted along the radial direction of the arc structure);

[0026] Figure 4 It is a schematic diagram of the positional relationship between the roller group and the arc structure of the peristaltic pump head in the prior art when the gap between the pipe and the arc structure is reduced (the arc structure rotates to adjust the distance between the two);

[0027] Figure 5 It is a schematic diagram of the positional relationship between the roller group and the arc structure of the peristaltic pump head in the prior art when the gap between the pressure tube increases (the arc structure rotates to adjust the distance between the two);

[0028] Figure 6 is a schematic structural diagram of a peristaltic pump head provided by an embodiment of the present invention;

[0029] Figure 7 is another structural schematic diagram of a peristaltic pump head provided by an embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of the internal structure of a peristaltic pump head provided by an embodiment of the present invention;

[0031] Fig. 9 is a front view schematic diagram of the internal structure of a peristaltic pump head provided by an embodiment of the present invention;

[0032] Fig.10 is a top view schematic diagram of the internal structure of a peristaltic pump head provided by an embodiment of the present invention;

[0033] Fig.11 is a bottom view schematic diagram of the internal structure of a peristaltic pump head provided by an embodiment of the present invention;

[0034] Fig.12 is a schematic structural diagram of a pump head top cover provided by an embodiment of the present invention;

[0035] Fig.13 is a schematic front view of a pump head top cover provided by an embodiment of the present invention;

[0036] Fig.14 is a schematic top view of a pump head top cover provided by an embodiment of the present invention;

[0037] Fig.15 is a bottom view schematic diagram of a pump head top cover provided by an embodiment of the present invention;

[0038] Fig.16 It is an exploded schematic diagram of a pump head top cover and a nut fixing block provided by an embodiment of the present invention;

[0039] Fig.17 is a schematic structural diagram of a nut fixing block provided in an embodiment of the present invention;

[0040] Fig.18 is a cross-sectional schematic diagram of a peristaltic pump head provided in an embodiment of the present invention (the pump head top cover is located on the far left);

[0041] Fig.19 is another cross-sectional schematic diagram of a peristaltic pump head provided by an embodiment of the present invention (the pump head top cover is located in the middle position);

[0042] Fig. 20 It is another schematic cross-sectional view of the peristaltic pump head provided in an embodiment of the present invention (the top cover of the pump head is located on the far right).

[0043] In the figure, 1 is the top cover of the pump head; 2 is the gap between the pressure pipes; 3 is the hose; 4 is the base; 5 is the roller; 6 is the support plate; 7 is the pin; 8 is the adjusting screw; 9 is the nut fixing block; 10 is the nut; 11 is the upper front pressure block; 12 is the upper rear pressure block; 13 is the lower front pressure block; 14 is the lower rear pressure block; 15 is the guide rod; 16 is the cylindrical scanning surface; 17 is the fixing nut; 18 is the main shaft. DETAILED DESCRIPTION

[0044] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0045] The present invention provides a peristaltic pump head, comprising a pump head roller group and a pump head top cover 1, wherein a tube-compression gap 2 is formed between the pump head roller group and the pump head top cover 1, and the size of the tube-compression gap 2 can be changed by adjusting the position of the pump head roller group or the pump head top cover 1 along the axial direction of the pump head roller group, and the distance values ​​of the tube-compression gaps 2 formed at various locations along the circumferential direction of the pump head roller group are the same. In the structure of a conventional peristaltic pump head, when adjusting the tube-compression gap between the roller group and the arc structure, see Figure 2-Figure 5 , the compression tube gap is not uniform, which may cause problems such as local overpressure of the hose or local loose compression of the hose; and the peristaltic pump head provided by the present invention can change the size of the compression tube gap 2 by adjusting the position of the pump head roller group or the pump head top cover 1 along the axial direction of the pump head roller group, and the pump head top cover 1 can be moved along the axial direction of the pump head roller group to change the relative position between the pump head top cover 1 and the pump head roller group, thereby realizing the adjustment of the size of the compression tube gap 2 between the pump head top cover 1 and the pump head roller group. In addition, the shape structure of the pump head roller group and the pump head top cover 1 can make the distance values ​​of the compression tube gaps 2 formed at various locations along the circumferential direction of the pump head roller group the same, that is, the compression tube gaps 2 formed at various locations along the circumferential direction of the pump head roller group are uniform, thereby avoiding local overpressure of the hose or local loose compression of the hose.

[0046] As an alternative embodiment, see Figure 18-Figure 20 There is a tube pressing surface on the inner side of the pump head top cover 1, which is a conical surface (a tube pressing gap 2 is formed between the tube pressing surface and the pump head roller group). The outline swept by the pump head roller group when rotating is called the scanning surface, which is a conical surface; the axis of the scanning surface is collinear with the axis of the tube pressing surface, and the cone angle of the tube pressing surface is the same as the cone angle of the scanning surface. Figure 18-Figure 20 As the pump head top cover 1 moves toward the right end, the compression tube gap 2 gradually decreases, and the compression tube gap 2 can always be kept in a uniform state; if it moves in the opposite direction, the compression tube gap 2 will increase uniformly. Assuming that the semi-cone angle of the compression tube surface of the pump head top cover 1 is θ, the distance of parallel movement of the arc is x, and the distance that the compression tube gap increases or decreases is y, then according to the geometric relationship, it can be known that: sinθ=y / x. In the same pump head, the cone angle of the compression tube surface is fixed, so the distance that the pump head top cover 1 moves in parallel and the distance that the compression tube gap increases or decreases is a linear relationship. The present invention can not only solve the problem of uneven gap when the peristaltic pump head is used to adjust the pressure, but also, during use, can uniformly adjust the pressure of the peristaltic pump from zero to any pressure value within the maximum value that the hose 3 can withstand.

[0047] As an alternative embodiment, see Figure 8-Figure 9A hose 3 is sandwiched between the pump head roller group and the pump head top cover 1. The hose 3 is wrapped around the pump head roller group and both ends of the hose 3 are inclined toward the end with a larger diameter of the scanning surface and can be led out from the base 4 of the peristaltic pump head. The surface perpendicular to the axis of the scanning surface is the reference surface. The inclination angle of the hose 3 relative to the reference surface is the semi-cone angle θ of the scanning surface. The position of the hose 3 on the pump head roller group limits the hose 3 from deviating.

[0048] As an alternative embodiment, see Figure 8 The pump head roller assembly includes a plurality of rollers 5, and the rollers 5 are evenly spaced along the circumferential direction of the pump head roller assembly. The outer contour of the roller 5 is in a truncated cone shape, so that when the pump head roller assembly rotates, the contour swept by the pump head roller assembly is a conical surface; see Figure 18-Figure 20 , support disks 6 are respectively provided at both ends of the pump head roller group, and the pin 7 passes through the corresponding roller 5 and is respectively fixed on the support disk 6 on the corresponding side at both ends. The pin 7 can be fixed on the support disk 6 in an interference fit manner, and the end of the roller 5 protrudes from the edge of the support disk 6 on the corresponding side along the radial direction of the pump head roller group to avoid interference between the support disk 6 and the inner side of the pump head top cover 1. In addition, the interior of the roller 5 can be a hollow structure, and the pin 7 and the roller 5 can be connected by a bearing, that is, the roller 5 can rotate relative to the pin 7, and a gasket can be provided between the support disk 6 and the bearing to limit the position of the bearing on the pin 7.

[0049] As an optional implementation, the position of the pump head top cover 1 can be adjusted along the axial direction of the pump head roller group, and the pump head top cover 1 can move along the axial direction of the pump head roller group; the peristaltic pump head also includes an adjusting screw 8, which is threadedly connected to the pump head top cover 1, and the axial direction of the adjusting screw 8 is parallel to the axial direction of the pump head roller group. Rotating the adjusting screw 8 can drive the pump head top cover 1 to move along the axial direction of the pump head roller group. A screw mechanism is formed between the adjusting screw 8 and the pump head top cover 1, and the pump head top cover 1 is equivalent to a slider structure. By rotating the adjusting screw 8, the pump head top cover 1 can move, thereby realizing the adjustment of the position of the pump head top cover 1.

[0050] As an optional embodiment, the connection structure between the adjusting screw 8 and the pump head top cover 1 can be as follows: Figure 18-Figure 20 The peristaltic pump head includes a nut fixing block 9, the nut fixing block 9 is detachably connected to the pump head top cover 1 (the two can be connected by bolts) and the nut 10 is limited between the nut fixing block 9 and the pump head top cover 1 (the nut 10 is fixed between the nut fixing block 9 and the pump head top cover 1), and the adjusting screw 8 passes through the nut 10 to realize the threaded connection between the adjusting screw 8 and the pump head top cover 1. When the adjusting screw 8 rotates, due to the threaded connection between the adjusting screw 8 and the nut 10, the nut 10, the nut fixing block 9 and the pump head top cover 1 move along the axial direction of the adjusting screw 8.

[0051] As an alternative embodiment, see Figure 16-17 The pump head top cover 1 is provided with a placement groove, and the nut fixing block 9 is located in the placement groove; the surface of the nut fixing block 9 in contact with the pump head top cover 1 is provided with a matching groove, the adjusting screw 8 passes through the matching groove and the nut 10 is located in the matching groove; the nut 10 is placed upright and the upper and lower two lateral sides of the nut 10 are in contact with the bottom surface of the matching groove and the bottom surface of the placement groove respectively, and the two end surfaces of the nut 10 are in contact with the corresponding side surfaces of the matching groove respectively. Fig.17 , illustrating the shape of the matching groove, there are two parallel strip grooves, and the two nuts 10 are respectively located in the corresponding strip grooves to limit the movement of the nuts 10 along the axial direction of the adjusting screw 8.

[0052] As an optional embodiment, the peristaltic pump head further includes an upper front pressing block 11 and an upper rear pressing block 12, and one end of the adjusting screw 8 passes through the upper front pressing block 11 and the pump head top cover 1 and is supported on the upper rear pressing block 12; see Figure 18-Figure 20 A thrust bearing is provided on the upper front pressure block 11, and a thrust bearing is also sleeved on the head of the adjusting screw 8. At the same time, a fixing nut 17 is provided on the adjusting screw 8. The fixing nut 17 is not only used to limit the position of the thrust bearing, but also to limit the rightward movement of the adjusting screw 8 along the axial direction; one end of the adjusting screw 8 is supported on the upper rear pressure block 12 through a bearing, and the adjusting screw 8 passes through the pump head top cover 1 and two nuts 10.

[0053] See also Figure 7 , a lower front pressing block 13 is arranged below the upper front pressing block 11 and the two are detachably connected, a lower rear pressing block 14 is arranged below the upper rear pressing block 12 and the two are detachably connected, and the pump head roller assembly is supported between the lower front pressing block 13 and the lower rear pressing block 14. After releasing the connection between the upper front pressing block 11 and the lower front pressing block 13 and the upper rear pressing block 12 and the lower rear pressing block 14, the pump head cover 1 can be disassembled as a whole, see Figure 8 , is a diagram of the pump head structure after the pump head cover 1 is removed. In addition, see Figure 18-Figure 20 The pump head roller assembly is supported between the lower front pressing block 13 and the lower rear pressing block 14 through the main shaft 18, and the support plate 6 is fixed on the main shaft 18.

[0054] As an optional implementation, the peristaltic pump head also includes 15, and guide rods 15 are arranged on both sides of the adjusting screw 8. The guide rods 15 pass through the pump head top cover 1 and the two ends are respectively connected to the upper front pressure block 11 and the upper rear pressure block 12. The axial direction of the guide rod 15 is parallel to the axial direction of the pump head roller group. The guide rod 15 is conducive to the stable movement of the pump head top cover 1.

[0055] A peristaltic pump comprises a peristaltic pump head provided by the present invention. The gaps 2 formed along the circumferential direction of the pump head roller assembly are uniform, so as to avoid problems such as local overpressure of the hose or local loose compression of the hose.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A peristaltic pump head, characterized in that: It comprises a pump head roller assembly and a pump head top cover (1), wherein: A tube-compression gap (2) is formed between the pump head roller assembly and the pump head top cover (1); the size of the tube-compression gap (2) can be changed by adjusting the position of the pump head roller assembly along the axial direction of the pump head roller assembly, and the distance values ​​of the tube-compression gaps (2) formed at various locations along the circumferential direction of the pump head roller assembly are the same; The inner side surface of the pump head top cover (1) has a tube pressing surface, the tube pressing surface is a conical surface, the profile swept by the pump head roller assembly when rotating is called a scanning surface, the scanning surface is a conical surface; the axis of the scanning surface is colinear with the axis of the tube pressing surface, and the cone angle of the tube pressing surface is the same as the cone angle of the scanning surface; A hose (3) is sandwiched between the pump head roller assembly and the pump head top cover (1), the hose (3) is wound around the pump head roller assembly and both ends of the hose (3) are inclined toward the end with a larger diameter of the scanning surface, the surface perpendicular to the axis of the scanning surface is the reference surface, and the inclination angle of the hose (3) relative to the reference surface is the semi-cone angle of the tube pressing surface.

2. The peristaltic pump head according to claim 1, characterized in that: The pump head roller assembly comprises a plurality of rollers (5), the rollers (5) being evenly spaced and distributed along the circumferential direction of the pump head roller assembly, and the outer contour of the rollers (5) being in the shape of a truncated cone; Support plates (6) are respectively provided at both ends of the pump head roller assembly, the insertion pin (7) passes through the corresponding roller (5) and the two ends are respectively fixed on the support plate (6) on the corresponding side, and the end of the roller (5) protrudes from the edge of the support plate (6) on the corresponding side along the radial direction of the pump head roller assembly.

3. A peristaltic pump head, characterized in that: It comprises a pump head roller assembly and a pump head top cover (1), wherein: A tube-compression gap (2) is formed between the pump head roller assembly and the pump head top cover (1); the size of the tube-compression gap (2) can be changed by adjusting the position of the pump head top cover (1) along the axial direction of the pump head roller assembly, and the distance values ​​of the tube-compression gaps (2) formed at various locations along the circumferential direction of the pump head roller assembly are the same; The position of the pump head top cover (1) is adjustable along the axis direction of the pump head roller assembly; The peristaltic pump head further comprises an adjusting screw (8), wherein the adjusting screw (8) is threadedly connected to the pump head top cover (1), and the axial direction of the adjusting screw (8) is parallel to the axial direction of the pump head roller assembly, and rotating the adjusting screw (8) can drive the pump head top cover (1) to move along the axial direction of the pump head roller assembly; The peristaltic pump head comprises a nut fixing block (9), the nut fixing block (9) is detachably connected to the pump head top cover (1), and a nut (10) is limited between the nut fixing block (9) and the pump head top cover (1), and the adjusting screw (8) passes through the nut (10) to achieve a threaded connection between the adjusting screw (8) and the pump head top cover (1); The pump head top cover (1) is provided with a placement groove, and the nut fixing block (9) is located in the placement groove; a matching groove is provided on the surface of the nut fixing block (9) that contacts the pump head top cover (1), the adjusting screw (8) passes through the matching groove and the nut (10) is located in the matching groove; the nut (10) is placed upright and the upper and lower two lateral sides of the nut (10) are in contact with the bottom surface of the matching groove and the bottom surface of the placement groove respectively, and the two end surfaces of the nut (10) are in contact with the corresponding side surfaces of the matching groove respectively; The inner side surface of the pump head top cover (1) has a tube pressing surface, the tube pressing surface is a conical surface, the profile swept by the pump head roller assembly when rotating is called a scanning surface, the scanning surface is a conical surface; the axis of the scanning surface is colinear with the axis of the tube pressing surface, and the cone angle of the tube pressing surface is the same as the cone angle of the scanning surface; A hose (3) is sandwiched between the pump head roller assembly and the pump head top cover (1), the hose (3) is wound around the pump head roller assembly and both ends of the hose (3) are inclined toward the end with a larger diameter of the scanning surface, the surface perpendicular to the axis of the scanning surface is the reference surface, and the inclination angle of the hose (3) relative to the reference surface is the semi-cone angle of the tube pressing surface.

4. The peristaltic pump head according to claim 3, characterized in that: The pump head roller assembly comprises a plurality of rollers (5), the rollers (5) being evenly spaced and distributed along the circumferential direction of the pump head roller assembly, and the outer contour of the rollers (5) being in the shape of a truncated cone; Support plates (6) are respectively provided at both ends of the pump head roller assembly, the insertion pin (7) passes through the corresponding roller (5) and the two ends are respectively fixed on the support plate (6) on the corresponding side, and the end of the roller (5) protrudes from the edge of the support plate (6) on the corresponding side along the radial direction of the pump head roller assembly.

5. The peristaltic pump head according to claim 3, characterized in that: The peristaltic pump head further comprises an upper front pressing block (11) and an upper rear pressing block (12), one end of the adjusting screw (8) passes through the upper front pressing block (11) and the pump head top cover (1) and is supported on the upper rear pressing block (12). A lower front pressing block (13) is arranged below the upper front pressing block (11) and the two are detachably connected, a lower rear pressing block (14) is arranged below the upper rear pressing block (12) and the two are detachably connected, and the pump head roller assembly is supported between the lower front pressing block (13) and the lower rear pressing block (14).

6. The peristaltic pump head according to claim 5, characterized in that: The peristaltic pump head further comprises a guide rod (15), the guide rods (15) being arranged on both sides of the adjusting screw (8), the guide rod (15) passing through the pump head top cover (1) and having two ends respectively connected to the upper front pressure block (11) and the upper rear pressure block (12), and the axial direction of the guide rod (15) is parallel to the axial direction of the pump head roller assembly.

7. A peristaltic pump, characterized in that: The invention comprises a peristaltic pump head as described in any one of claims 1 to 6.

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