A low-pulsation, large-capacity externally rotating multi-tube parallel peristaltic pump

Abstract

The present invention discloses a low-pulsation large-capacity externally rotating multi-tube parallel peristaltic pump, wherein a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged on a mounting plate; the pipeline mechanism includes an extrusion sleeve, an inlet and outlet liquid dispensing tube and a hose, the liquid dispensing tube is arranged in the extrusion sleeve along the vertical direction, and a plurality of hoses are arranged in parallel and equidistantly on the outside of the extrusion sleeve along the vertical direction, and the two ends of the hose are respectively connected to the liquid dispensing tube; the roller rotating mechanism is located on the outside of the hose and is connected to the driving mechanism; the driving mechanism drives the roller rotating mechanism to rotate and squeeze the hose, realizing the fluid conveying process from single tube → multiple tubes → single tube, and there is a continuous and uniform time difference between the squeezing and releasing of each hose, so as to realize the continuous low-pulsation conveying of the fluid. The present invention has the characteristics of low wear on the inner wall of the hose and high continuous filling accuracy, effectively reducing the pulsation during fluid transmission, and solving the problems of fluid contamination and low continuous filling accuracy caused by severe wear on the inner wall of the hose in the existing peristaltic pump and the generation of a large number of particles, and the low continuous filling accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid filling pumps, and in particular relates to a low-pulsation, large-capacity, externally rotating multi-tube parallel peristaltic pump. Background Art

[0002] A peristaltic pump is a liquid delivery device with controllable flow rate. It uses a rotating roller to roll an elastic hose. The fluid in the hose moves as the roller rotates, just like squeezing the hose with two fingers. As the fingers move, the liquid flows.

[0003] Existing peristaltic pumps rely on a roller assembly with a rotating device to rotate and roll the hose to discharge the fluid. For the same hose, the roller squeezes or spins the hose at the same position each time it is filled. The inner wall of the hose at this position will be severely worn, and a large number of particles are easily generated, causing the fluid to be contaminated.

[0004] The existing peristaltic pump controls the rolling extrusion volume of the fluid by the number of turns or angle of the roller assembly. For each filling, the initial position and the end position of the roller assembly rolling the hose will not be at the same position due to the accumulation of turns or angles. In addition, the elastic recovery of the hose at different positions is also different, making it difficult for the traditional peristaltic pump to achieve the expected continuous filling accuracy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to effectively reduce the pulsation of the existing peristaltic pump during fluid transmission, and at the same time solve the problems of severe wear of the inner wall of the hose, easy generation of a large number of particles leading to fluid contamination, and low continuous filling accuracy. The present invention provides a low-pulsation, large-capacity, externally rotating, multi-tube parallel peristaltic pump with a compact structure, convenient disassembly and assembly, high reliability, low wear of the inner wall of the hose, high continuous filling accuracy and low cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A low-pulsation, large-capacity, externally rotating, multi-tube parallel peristaltic pump, comprising a mounting plate, on which a pump sleeve, a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged, both of which are located in the pump sleeve; the pipeline mechanism comprises an extrusion sleeve, a liquid inlet separator tube, a liquid outlet separator tube and a plurality of elastic hoses, the liquid inlet separator tube and the liquid outlet separator tube are arranged on the inner side of the extrusion sleeve in a vertical direction, the plurality of elastic hoses are arranged on the outer side of the extrusion sleeve in parallel and equidistantly in a vertical direction, and the two ends of the elastic hoses are respectively connected to the liquid inlet separator tube and the liquid outlet separator tube; the roller rotating mechanism is located on the outer side of the elastic hose and is connected to the output end of the driving mechanism; under the drive of the driving mechanism, the roller rotating mechanism rotates and squeezes the elastic hoses uniformly distributed in the vertical direction, driving the fluid to flow in from the inlet of the liquid inlet separator tube and be transported to the outlet of the liquid outlet separator tube, thereby realizing the fluid transport process from single tube → multiple tubes → single tube, and there is a continuous and uniform time difference, i.e., phase difference, between the extrusion and release of each elastic hose, thereby realizing continuous low-pulsation transport of the fluid.

[0008] As a further improvement of the present invention, the roller rotation mechanism includes: an end cover, an upper tapered sleeve, a lower bearing seat, a roller assembly and an upper bearing seat; the lower bearing seat is rotatably set on the mounting plate through a third deep groove ball bearing, and is connected to the output end of the driving mechanism; the roller assembly is arranged in a vertical direction, one end of the roller assembly is connected to the lower bearing seat, and the other end of the roller assembly is connected to the upper bearing seat; the upper tapered sleeve is nested on the outer side of the top of the extrusion sleeve, and is rotatably connected to the upper bearing seat through a first deep groove ball bearing, and an end cover is provided between the upper tapered sleeve, the upper bearing seat and the extrusion sleeve to limit the displacement of the upper tapered sleeve and the upper bearing seat; under the drive of the driving mechanism, the lower bearing seat drives the roller assembly and the upper bearing seat to rotate.

[0009] As a further improvement of the present invention, the roller assembly includes: a roller shaft, an elastic retaining ring for the shaft, a second deep groove ball bearing and a roller; the two ends of the roller shaft are respectively connected and fixed to the lower bearing seat and the upper bearing seat, and the roller is nested in the outer periphery of the roller shaft. The connection between the two ends of the roller and the roller shaft is provided with an elastic retaining ring for the shaft and a second deep groove ball bearing to enable the roller to roll the elastic hose while rotating.

[0010] As a further improvement of the present invention, multiple groups of roller assemblies are evenly distributed between the lower bearing seat and the upper bearing seat in the circumferential direction, and the circumferential angle between adjacent roller assemblies is β; multiple avoidance gaps are opened in the circumferential direction of the extrusion sleeve, and the equal offset angle difference between adjacent avoidance gaps is β / (n-1), and the arc length of the avoidance gap is β, so that each elastic hose can be rotated, squeezed and loosened along the arc length of β in the circumferential direction; wherein n is the number of elastic hoses arranged on the outside of the extrusion sleeve.

[0011] As a further improvement of the present invention, when the roller squeezes the elastic hose, the outer side of the extrusion sleeve presses against the elastic hose, so that the distance h between the upper layer and the lower layer of the tube wall of the elastic hose is maintained at 2×(70%~90%)t, where t is the tube wall thickness of the elastic hose, mm.

[0012] As a further improvement of the present invention, the pipeline mechanism also includes a fourth deep groove ball bearing, a lower tapered sleeve and a support seat; the support seat is rotatably connected to the lower bearing seat through the fourth deep groove ball bearing, and a lower tapered sleeve is provided between the support seat and the fourth deep groove ball bearing to realize the installation and fixation of the support seat, and the bottom of the extrusion sleeve is connected and fixed to the support seat.

[0013] As a further improvement of the present invention, the pump sleeve includes a pressure plate and a support plate, the support plate is arranged on the mounting plate in the vertical direction, the pressure plate is arranged on the top of the support plate in the horizontal direction, and the top of the extrusion sleeve is connected and fixed to the pressure plate.

[0014] As a further improvement of the present invention, the liquid inlet and outlet distribution pipes are both provided with a plurality of pipe joints along the vertical direction.

[0015] As a further improvement of the present invention, the driving mechanism includes a reducer, a driving component and an external PLC controller; the driving component is installed on a mounting plate, and the output end of the driving component is connected to the roller rotation mechanism through the reducer; the driving component and the PLC controller are electrically connected, and the PLC controller controls the operation of the driving component.

[0016] As a further improvement of the present invention, the driving component adopts a stepping motor or a servo motor or a motor driving unit.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The low-pulsation, large-capacity, externally rotating, multi-tube parallel peristaltic pump of the present invention is characterized in that a pump sleeve, a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged on a mounting plate; the roller rotating mechanism and the pipeline mechanism are both located inside the pump sleeve, i.e., they constitute the main structure of the peristaltic pump; specifically, the pipeline mechanism comprises an extrusion sleeve, a liquid inlet separator tube, a liquid outlet separator tube and a plurality of elastic hoses; the liquid inlet separator tube and the liquid outlet separator tube are arranged on the inner side of the extrusion sleeve in a vertical direction; the plurality of elastic hoses are arranged on the outer side of the extrusion sleeve in parallel and equidistantly in a vertical direction; and the two ends of the elastic hose are respectively connected to the liquid inlet separator tube and the liquid outlet separator tube, thereby effectively reducing the overall installation volume of the peristaltic pump; the roller rotating mechanism is arranged on the outer side of the elastic hose and is connected to the output end of the driving mechanism; The roller rotating mechanism is driven to rotate by a driving mechanism. The roller rotating mechanism rotates while squeezing the elastic hoses evenly distributed in the vertical direction, driving the fluid to flow in from the inlet of the liquid inlet dispensing tube and be transported to the outlet of the liquid outlet dispensing tube, thereby realizing the fluid transportation process from single tube → multiple tubes → single tube, and there is a continuous and uniform time difference, i.e., phase difference, between the squeezing and release of each elastic hose, thereby realizing continuous low-pulsation transportation of the fluid, which not only ensures the minimum wear of the elastic hose by the roller mechanism, but also avoids the risk of fluid contamination due to severe wear of the inner wall of the hose and the generation of a large number of particles, and effectively extends the service life of the pump tube. Since the elastic hose is always in a squeezed state during the rotation of the roller mechanism, the purpose of high-precision and large-capacity continuous filling is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structural principle of a low-pulsation, large-capacity externally rotating multi-tube parallel peristaltic pump in a specific embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the top structural principle of a low-pulsation, large-capacity externally rotating multi-tube parallel peristaltic pump in a specific embodiment of the present invention.

[0021] Figure 3 It is a left-side structural principle schematic diagram of a low-pulsation, large-capacity externally rotating multi-tube parallel peristaltic pump in a specific embodiment of the present invention.

[0022] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure principle in the AA direction.

[0023] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure principle along the BB direction.

[0024] Figure 6 It is a schematic diagram of the three-dimensional axonometric structure principle of a low-pulsation, large-capacity externally rotating multi-tube parallel peristaltic pump in a specific embodiment of the present invention.

[0025] Figure 7It is a schematic diagram of the three-dimensional axonometric structure principle of the pipeline mechanism in a specific embodiment of the present invention.

[0026] Legend: 1. Extrusion sleeve; 2. End cover; 3. Upper tapered sleeve; 4. First deep groove ball bearing; 5. Pressure plate; 6. Roller shaft; 7. Elastic retaining ring for shaft; 8. Second deep groove ball bearing; 9. Roller; 10. Support plate; 11. Lower bearing seat; 12. Waterproof retaining ring; 13. O-ring; 14. Mounting table; 15. Reducer; 16. Drive assembly; 17. Third deep groove ball bearing; 18. Fourth deep groove ball bearing; 19. Lower tapered sleeve; 20. Support seat; 21. Liquid inlet and outlet pipe; 22. Elastic hose; 23. Upper bearing seat; 24. Liquid outlet and outlet pipe; 25. Elastic retaining ring for hole; 26. Pipe joint; 27. Avoidance gap. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0028] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0030] Example

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 6As shown, the low pulsation large capacity external rotating multi-tube parallel peristaltic pump of the present invention comprises a mounting plate 14, on which a pump sleeve, a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged. The pump sleeve comprises a pressing plate 5 and a supporting plate 10, the supporting plate 10 is arranged on the mounting plate 14 in the vertical direction, the pressing plate 5 is arranged on the top of the supporting plate 10 in the horizontal direction, and the roller rotating mechanism and the pipeline mechanism are both located in the pump sleeve. Figure 7 As shown, the pipeline mechanism includes an extrusion sleeve 1, a liquid inlet and liquid outlet pipe 21, a liquid outlet and liquid outlet pipe 24 and an elastic hose 22; the extrusion sleeve 1 is a hollow cylindrical structure with one side open, and the liquid inlet and liquid outlet pipe 21 and the liquid outlet and liquid outlet pipe 24 are arranged on the inner side of the extrusion sleeve 1 along the vertical direction, and the liquid inlet and liquid outlet pipe 21 and the liquid outlet and liquid outlet pipe 24 are both provided with sixteen pipe joints 26 along the vertical direction, and the pipe joints 26 face the opening side of the extrusion sleeve 1, so as to facilitate the disassembly and assembly of the elastic hose 22. The sixteen elastic hoses 22 are arranged parallel and equidistantly on the outer side of the extrusion sleeve 1 along the vertical direction, and the two ends of the elastic hose 22 are respectively connected to the liquid inlet and liquid outlet pipe 21 and the liquid outlet pipe 24. The roller rotating mechanism is located on the outer side of the elastic hose 22 and is connected to the output end of the driving mechanism. Driven by the driving mechanism, the roller rotating mechanism rotates and squeezes the elastic hoses 22 evenly distributed in the vertical direction, driving the fluid to flow in from the inlet of the liquid inlet dispensing tube 21 and transport to the outlet of the liquid outlet dispensing tube 24, realizing the fluid transport process from single tube → multiple tubes → single tube, and each elastic hose 22 is squeezed and released with a continuous and uniform time difference, i.e., phase difference, to achieve continuous low-pulsation transport of the fluid. This ensures that the roller mechanism has the lowest wear on the elastic hose 22, avoids the risk of fluid contamination due to severe wear of the inner wall of the hose and the generation of a large number of particles, and effectively extends the service life of the pump tube. Since the elastic hose 22 is always in a squeezed state during the rotation of the roller mechanism, the purpose of high-precision, large-capacity continuous filling is achieved.

[0032] like Figure 1 , Figure 4 and Figure 5 As shown, the roller rotating mechanism includes: an end cover 2, an upper cone sleeve 3, a lower bearing seat 11, a roller assembly and an upper bearing seat 23. The lower bearing seat 11 is rotatably set on the mounting plate 14 through a third deep groove ball bearing 17, and is connected to the output end of the driving mechanism. In addition, a waterproof retaining ring 12 is provided between the bottom of the lower bearing seat 11 and the mounting plate 14. The waterproof retaining ring 12 is fixed to the mounting plate 14 by screws, and an O-ring 13 is provided between the waterproof retaining ring 12 and the mounting plate 14 to prevent contamination caused by fluid leakage from the pipeline mechanism and improve the cleanliness of the peristaltic pump during operation. At the same time, the tapered structure of the upper cone sleeve 3 and the lower cone sleeve 19 can quickly remove the extrusion sleeve 1 from the pump sleeve, thereby improving the replacement efficiency of the elastic hose 22.

[0033] like Figure 5 and Figure 6As shown, the roller assembly is arranged in the vertical direction, one end of the roller assembly is connected to the lower bearing seat 11, and the other end of the roller assembly is connected to the upper bearing seat 23; that is, the roller assembly extrudes multiple groups of elastic hoses 12 simultaneously along the vertical direction. The upper cone sleeve 3 is nested on the outside of the top of the extrusion sleeve 1, and is rotatably connected to the upper bearing seat 23 through the first deep groove ball bearing 4. A hole elastic retaining ring 25 is also provided between the bottom of the first deep groove ball bearing 4 and the upper bearing seat 23 to ensure smooth rotation of the upper bearing seat 23. An end cover 2 is provided in the cavity surrounded by the upper cone sleeve 3, the pressure plate 5, the upper bearing seat 23 and the extrusion sleeve 1 to limit the displacement of the upper cone sleeve 3 and the upper bearing seat 23. Driven by the driving mechanism, the lower bearing seat 11 drives the roller assembly and the upper bearing seat 23 to rotate, and the roller assembly extrudes the elastic hose 22 while rotating.

[0034] like Figure 1 and Figure 5 As shown, the roller assembly includes: a roller shaft 6, a shaft elastic circlip 7, a second deep groove ball bearing 8 and a roller 9. The top end of the roller shaft 6 is nested and fixed in the upper bearing seat 23, the bottom end of the roller shaft 6 is connected and fixed to the lower bearing seat 11 by a fastening screw, the roller 9 is nested in the outer periphery of the roller shaft 6, and the shaft elastic circlip 7 and the second deep groove ball bearing 8 are provided at the connection between the two ends of the roller 9 and the roller shaft 6, so that the roller 9 can roll the elastic hose 22 while rotating.

[0035] like Figure 4 As shown, three groups of roller assemblies are evenly distributed between the lower bearing seat 11 and the upper bearing seat 23 along the circumferential direction, and the circumferential angle β between adjacent roller assemblies is 120°. Figure 7 As shown, the extrusion sleeve 1 is provided with hose extrusion avoidance notches 27 with an equal offset angle difference of 8° (i.e., equal phase difference) and an arc length of 120° in the circumferential direction. The avoidance notches 27 are spirally distributed in the circumferential direction of the non-opening side of the extrusion sleeve 1 as a whole, so as to ensure that only 120° arc length of each elastic hose 22 is rotated, squeezed and loosened in the circumferential direction. During each filling, three groups of roller assemblies evenly distributed (with an angle difference of 120°) on the outer side of the circumference of the extrusion sleeve 1 rotate and squeeze the sixteen elastic hoses 22 arranged in parallel and equidistantly on the extrusion sleeve 1, pushing the fluid to flow in from the liquid inlet on one side of the pump body, flow through the liquid inlet distributor 21, be divided into the sixteen elastic hoses 22, gather into the liquid outlet distributor 24, and flow out from the liquid outlet on the other side of the pump body, realizing the fluid conveying process from single tube → multiple tubes → single tube, and each elastic hose 22 is squeezed and loosened with a continuous and uniform time difference, i.e., phase difference, to realize continuous metering and low-pulsation conveying of the fluid.

[0036] In this embodiment, when the roller 9 squeezes the elastic hose 22, the outer side of the squeezing sleeve 1 presses against the elastic hose 22, so that the distance h between the upper layer and the lower layer of the tube wall of the elastic hose 22 is maintained at 2×(70%-90%)t, where t is the tube wall thickness of the elastic hose 22, mm. This ensures that the inner wall of the elastic hose 22 has a low degree of wear, a small amount of particles is generated, and the filled fluid is not easily contaminated.

[0037] like Figure 5 As shown, the pipeline mechanism also includes a fourth deep groove ball bearing 18, a lower tapered sleeve 19 and a support seat 20. The support seat 20 is rotatably connected to the lower bearing seat 11 through the fourth deep groove ball bearing 18, and a lower tapered sleeve 19 is provided between the support seat 20 and the fourth deep groove ball bearing 18 to achieve the installation and fixation of the support seat 20, the bottom of the extrusion sleeve 1 is connected and fixed to the support seat 20, and the top of the extrusion sleeve 1 is connected and fixed to the pressing plate 5 to achieve the stable installation of the pipeline mechanism.

[0038] like Figure 5 and Figure 6 As shown, the driving mechanism includes a reducer 15, a driving assembly 16 and an external PLC controller. The driving assembly 16 is mounted on the mounting plate 14, and the output end of the driving assembly 16 is connected to the lower bearing seat 11 through the reducer 15; the driving assembly 16 is electrically connected to the PLC controller, and the PLC controller controls the operation of the driving assembly 16, such as controlling the start and stop, forward and reverse rotation, full speed, speed regulation and flow calibration of the driving assembly 16, so as to improve the control accuracy of filling.

[0039] In this embodiment, the driving assembly 16 adopts a stepper motor. In other embodiments, the driving assembly 16 may also adopt a servo motor or a motor drive unit. As long as the roller rotating mechanism can be driven to rotate smoothly, the roller assembly can be realized to squeeze the elastic hose 22 smoothly.

[0040] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the spirit and technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention still fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A low pulsation, large capacity, externally rotating, multi-tube parallel peristaltic pump, characterized in that: The invention comprises a mounting plate (14), on which a pump sleeve, a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged, wherein the roller rotating mechanism and the pipeline mechanism are both located inside the pump sleeve; the pipeline mechanism comprises an extrusion sleeve (1), a liquid inlet liquid dispensing pipe (21), a liquid outlet liquid dispensing pipe (24) and a plurality of elastic hoses (22), wherein the liquid inlet liquid dispensing pipe (21) and the liquid outlet liquid dispensing pipe (24) are arranged on the inner side of the extrusion sleeve (1) in a vertical direction, and the plurality of elastic hoses (22) are arranged on the outer side of the extrusion sleeve (1) in parallel and at equal distances in a vertical direction, and the two ends of the elastic hose (22) are respectively The roller rotating mechanism is connected to the liquid inlet dispensing pipe (21) and the liquid outlet dispensing pipe (24); the roller rotating mechanism is located outside the elastic hose (22) and is connected to the output end of the driving mechanism; under the drive of the driving mechanism, the roller rotating mechanism rotates and squeezes the elastic hose (22) evenly distributed in the vertical direction, driving the fluid to flow from the inlet of the liquid inlet dispensing pipe (21) and be transported to the outlet of the liquid outlet dispensing pipe (24), thereby realizing the fluid transport process from single tube → multiple tubes → single tube, and there is a continuous and uniform time difference, i.e., a phase difference, when each elastic hose (22) is squeezed and released, thereby realizing continuous low-pulsation transport of the fluid.

2. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 1, characterized in that: The roller rotating mechanism comprises: an end cover (2), an upper tapered sleeve (3), a lower bearing seat (11), a roller assembly and an upper bearing seat (23); the lower bearing seat (11) is rotatably arranged on a mounting plate (14) through a third deep groove ball bearing (17), and is connected to an output end of a driving mechanism; the roller assembly is arranged in a vertical direction, one end of the roller assembly is connected to the lower bearing seat (11), and the other end of the roller assembly is connected to the upper bearing seat (23); the upper tapered sleeve (3) is nested on the outer side of the top of the extrusion sleeve (1), and is rotatably connected to the upper bearing seat (23) through a first deep groove ball bearing (4); an end cover (2) is arranged between the upper tapered sleeve (3), the upper bearing seat (23) and the extrusion sleeve (1) to limit the displacement of the upper tapered sleeve (3) and the upper bearing seat (23); under the drive of the driving mechanism, the lower bearing seat (11) drives the roller assembly and the upper bearing seat (23) to rotate.

3. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 2, characterized in that: The roller assembly comprises: a roller shaft (6), a shaft elastic retaining ring (7), a second deep groove ball bearing (8) and a roller (9); the two ends of the roller shaft (6) are respectively connected and fixed to a lower bearing seat (11) and an upper bearing seat (23); the roller (9) is nested in the outer periphery of the roller shaft (6); the shaft elastic retaining ring (7) and the second deep groove ball bearing (8) are provided at the connection between the two ends of the roller (9) and the roller shaft (6), so as to enable the roller (9) to roll the elastic hose (22) while rotating.

4. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 3 is characterized in that: A plurality of roller assemblies are evenly distributed between a lower bearing seat (11) and an upper bearing seat (23) in a circumferential direction, and a circumferential angle between adjacent roller assemblies is β; a plurality of avoidance notches (27) are provided in a circumferential direction of the extrusion sleeve (1), and the difference in equal offset angles between adjacent avoidance notches (27) is β / (n-1), and the arc length of the avoidance notches (27) is β, so that each elastic hose (22) can be rotated, squeezed and loosened along an arc length of β in a circumferential direction; wherein n is the number of elastic hoses (22) arranged outside the extrusion sleeve (1).

5. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 4, characterized in that: When the roller (9) squeezes the elastic hose (22), the outer side of the squeezing sleeve (1) presses against the elastic hose (22), so that the distance h between the upper layer and the lower layer of the tube wall of the elastic hose (22) is maintained at 2×(70% to 90%) t, where t is the tube wall thickness of the elastic hose (22), mm.

6. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 3, characterized in that: The pipeline mechanism also includes a fourth deep groove ball bearing (18), a lower tapered sleeve (19) and a support seat (20); the support seat (20) is rotatably connected to the lower bearing seat (11) via the fourth deep groove ball bearing (18); a lower tapered sleeve (19) is provided between the support seat (20) and the fourth deep groove ball bearing (18) to achieve installation and fixation of the support seat (20); and the bottom of the extrusion sleeve (1) is connected and fixed to the support seat (20).

7. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 6, characterized in that: The pump sleeve comprises a pressing plate (5) and a supporting plate (10), wherein the supporting plate (10) is arranged on a mounting platform (14) in a vertical direction, and the pressing plate (5) is arranged on the top of the supporting plate (10) in a horizontal direction, and the top of the extrusion sleeve (1) is connected and fixed to the pressing plate (5).

8. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to any one of claims 1 to 7, characterized in that: The liquid inlet and outlet distribution pipes (21) and the liquid outlet and distribution pipes (24) are both provided with a plurality of pipe joints (26) along the vertical direction.

9. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to any one of claims 1 to 7, characterized in that: The driving mechanism comprises a speed reducer (15), a driving component (16) and an external PLC controller; the driving component (16) is mounted on a mounting plate (14), and the output end of the driving component (16) is connected to the roller rotating mechanism via the speed reducer (15); the driving component (16) is electrically connected to the PLC controller, and the PLC controller controls the operation of the driving component (16).

10. The low pulsation, large capacity, externally rotating multi-tube parallel peristaltic pump according to claim 9, characterized in that: The driving component (16) adopts a stepping motor or a servo motor or a motor driving unit.

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