Low-pulsation rolling wheel internal rotation parallel multi-pipe peristaltic pump

Abstract

The invention discloses a low-pulsation rolling wheel internal rotation parallel multi-pipe peristaltic pump which is characterized in that an extrusion mechanism, a driving mechanism, a rolling wheel rotating mechanism and a pipeline mechanism are arranged on a mounting table plate, the pipeline mechanism comprises an inlet and outlet liquid distribution pipe and a hose, and the liquid distribution pipe is arranged outside the extrusion mechanism in the vertical direction; the hoses are arranged in the extrusion mechanism in parallel at equal intervals in the vertical direction, and the two ends of the hoses are connected with the liquid distribution pipes correspondingly; the roller rotating mechanism is positioned on the inner side of the hose and connected with the driving mechanism; the driving mechanism drives the roller rotating mechanism to rotate and extrude the hoses, the single-pipe-multi-pipe-single-pipe fluid conveying process is achieved, continuous and uniform time differences exist when all the hoses are extruded and loosened, and continuous low-pulse fluid conveying is achieved. The peristaltic pump has the advantages of being low in abrasion loss of the inner wall of the hose and high in continuous filling precision, pulsation during fluid transmission is effectively reduced, and the problems that in an existing peristaltic pump, due to the fact that the inner wall of the hose is seriously abraded, a large number of particles are generated, fluid is polluted, and the continuous filling precision is low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of fluid filling pumps, and in particular to a low-pulsation roller inner-rotating parallel multi-tube 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 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. A low-pulsation roller inner rotating parallel multi-tube 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 is provided.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A low-pulsation roller inner-rotating parallel multi-tube peristaltic pump comprises a mounting plate, on which an extrusion mechanism, a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged, wherein the roller rotating mechanism is located in the extrusion mechanism; the pipeline mechanism comprises a liquid inlet separator tube, a liquid outlet separator tube and a plurality of elastic hoses, wherein the liquid inlet separator tube and the liquid outlet separator tube are arranged outside the extrusion mechanism in a vertical direction, and the plurality of elastic hoses are arranged inside the extrusion mechanism 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 inside 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.

[0007] As a further improvement of the present invention, the roller rotation mechanism includes a transmission shaft, an upper fixed plate, a bearing seat, a lower fixed plate and a roller assembly; one end of the bearing seat is connected to the mounting plate, and the other end of the bearing seat is connected to the extrusion mechanism, one end of the transmission shaft passes through the bearing seat and is connected to the output end of the driving mechanism, and the other end of the transmission shaft extends into the extrusion mechanism, and the two ends of the roller assembly are respectively connected to the transmission shaft through the upper fixed plate and the lower fixed plate, and the roller assembly and the transmission shaft are both located on the inner side of the elastic hose. Under the drive of the driving mechanism, the transmission shaft drives the roller assembly to rotate and extrude the elastic hose evenly distributed in the vertical direction. As a further improvement of the present invention, a third deep groove ball bearing is provided at the connection between the two ends of the bearing seat and the transmission shaft; and an O-ring is provided at the connection between the bearing seat and the mounting plate. As a further improvement of the present invention, the roller assembly includes a roller and a roller shaft, the two ends of the roller shaft are respectively connected to the upper fixed plate and the lower fixed plate, the roller shaft is nested in the roller, and a second deep groove ball bearing is provided at the connection between the two ends of the roller and the roller shaft. As a further improvement of the present invention, the roller assemblies are divided into two groups and are symmetrically arranged on both sides of the transmission shaft. As a further improvement of the present invention, the extrusion mechanism includes a front extrusion block, a rear extrusion block and a locking assembly, and the front extrusion block and the rear extrusion block are locked by the locking assembly to form an extrusion sleeve; the front extrusion block and the rear extrusion block are each provided with a plurality of avoidance notches along the vertical direction, and when the front extrusion block and the rear extrusion block are locked, the formed extrusion sleeve forms evenly distributed avoidance notches with equal angle differences in the circumferential direction, so as to achieve that each elastic hose has an arc length of not less than 180° in the circumferential direction to be rotated, squeezed or released. As a further improvement of the present invention, the locking assembly includes a handle, a locking nut, a locking screw, a first turn pin and a second turn pin; one end of the locking nut is connected to the handle through the first turn pin, the other end of the locking nut is detachably connected to one end of the locking screw, and the other end of the locking screw is provided with a second turn pin; the locking screw passes through the side of the front extrusion block and the side of the rear extrusion block, and is locked by the locking nut to achieve a locking connection between the front extrusion block and the rear extrusion block. As a further improvement of the present invention, the extrusion mechanism also includes an upper cover plate, a support plate and a lower cover plate; the two ends of the support plate are respectively connected to the upper cover plate and the lower cover plate; the two ends of the front extrusion block and the two ends of the rear extrusion block are respectively connected to the upper cover plate and the lower cover plate through positioning pins; the connection between the transmission shaft and the upper cover plate and the lower cover plate is provided with a first deep groove ball bearing; the bearing seat is connected to the lower cover plate. As a further improvement of the present invention, the driving mechanism includes a reducer, a driving component and an external PLC controller; the reducer is installed on the 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. As a further improvement of the present invention, the driving component adopts a stepping motor or a servo motor or a motor driving unit. Compared with the prior art, the advantages of the present invention are: The low-pulsation roller inner rotating parallel multi-tube peristaltic pump of the present invention realizes uniform distribution of fluid by arranging a liquid inlet and a liquid outlet dispensing tube on the outside of an extrusion mechanism in the vertical direction, arranging a plurality of elastic hoses in parallel and equidistantly on the inside of the extrusion mechanism in the vertical direction, and connecting the two ends of the elastic hoses to the liquid inlet and the liquid outlet dispensing tubes respectively; and arranging a roller rotating mechanism on the inside of the elastic hoses and connecting the roller rotating mechanism to the output end of the driving mechanism; and the roller rotating mechanism is driven to rotate by the driving mechanism, and the roller rotating mechanism rotates while squeezing the elastic hoses evenly distributed in the vertical direction, so as to drive the fluid from the inlet to the outlet. The fluid flows into the inlet of the liquid dispensing tube and is transported to the outlet of the liquid dispensing tube, realizing the fluid transportation process from single tube → multiple tubes → single tube, and there is a continuous and uniform time difference, that is, phase difference, when each elastic hose is squeezed and released, thereby realizing continuous low-pulsation transportation of the fluid, which not only ensures that the roller mechanism has the lowest wear on the elastic hose, 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. Because 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

[0008] Figure 1 It is a schematic diagram of the main structural principle of a low-pulsation roller inner rotating parallel multi-tube peristaltic pump in a specific embodiment of the present invention; Figure 2 It is a schematic diagram of the left view of the structural principle of a low-pulsation roller inner rotating parallel multi-tube peristaltic pump in a specific embodiment of the present invention; Figure 3 It is a schematic diagram of the structural principle of a low-pulsation roller inner rotating parallel multi-tube peristaltic pump in a bottom view in a specific embodiment of the present invention; Figure 4 for Figure 1 Cross-sectional top view along the AA axis; Figure 5 for Figure 1 Cross-sectional top view along the mid-BB direction; Figure 6 for Figure 1 Cross-sectional top view along CC direction; Figure 7 for Figure 2 Cross-sectional top view along the mid-DD direction; Figure 8 It is a schematic diagram of the three-dimensional axonometric projection structure principle of a low-pulsation roller inner rotating parallel multi-tube peristaltic pump in a specific embodiment of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional axonometric projection structure principle of the low-pulsation roller inner rotating parallel multi-tube peristaltic pump without the front extrusion block in a specific embodiment of the present invention; Fig.10 It is a schematic diagram of the structural principle of the extrusion sleeve in a specific embodiment of the present invention; Fig.11 It is a schematic diagram of the structural principle of the locking assembly in a specific embodiment of the present invention; Legend: 1. First deep groove ball bearing; 2. Bearing liner; 3. Drive shaft; 4. Upper fixing plate; 5. Second deep groove ball bearing; 6. First screw; 7. Positioning pin; 8. Roller; 9. Elastic hose; 10. Upper cover plate; 11. Support plate; 12. Lower cover plate; 13. Bearing seat; 14. O-ring; 15. Mounting table; 16. Reducer; 17. Drive assembly; 18. Dispensing pipe mounting plate; 19. Liquid inlet dispensing pipe; 20. Handle; 21. Front extrusion block; 22. Locking nut; 23. Liquid outlet dispensing pipe; 24. Locking screw; 25. Rear extrusion block; 26. Third deep groove ball bearing; 27. First rotating pin; 28. Roller shaft; 29. ​​Second rotating pin; 30. Lower fixing plate; 31. Second screw; 32. Avoidance gap. DETAILED DESCRIPTION

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Example like Figure 1 , Figure 2 and Figure 3 As shown, the low pulsation roller inner rotating parallel multi-tube peristaltic pump of the present invention comprises a mounting plate 15, on which an extrusion mechanism, a driving mechanism, a roller rotating mechanism and a pipeline mechanism are arranged, and the roller rotating mechanism is located inside the extrusion mechanism. The pipeline mechanism comprises a liquid inlet separator 19, a liquid outlet separator 23 and nine elastic hoses 9, the liquid inlet separator 19 and the liquid outlet separator 23 are arranged outside the extrusion mechanism in the vertical direction, and the nine elastic hoses 9 are arranged in parallel and equidistantly inside the extrusion mechanism in the vertical direction, the liquid inlet separator 19 and the liquid outlet separator 23 are both provided with hose connectors, and the input end and the output end of the elastic hose 9 are respectively connected to the liquid inlet separator 19 and the liquid outlet separator 23. The roller rotating mechanism is located inside the elastic hose 9 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 hose 9 evenly distributed in the vertical direction, driving the fluid to flow into the inlet of the liquid inlet dispensing tube 19 and be transported to the outlet of the liquid outlet dispensing tube 23, thereby realizing the fluid transportation process from single tube → multiple tubes → single tube, and each elastic hose 9 is squeezed and released with a continuous and uniform time difference, i.e., a phase difference, to realize continuous low-pulsation transportation of the fluid. In this embodiment, by arranging the liquid inlet distribution tube 19 and the liquid outlet distribution tube 23 on the outside of the extrusion mechanism in the vertical direction, nine elastic hoses 9 are arranged in parallel and equidistantly on the inside of the extrusion mechanism in the vertical direction, and the two ends of the elastic hoses 9 are respectively connected to the liquid inlet distribution tube 19 and the liquid outlet distribution tube 23, uniform distribution of the fluid is achieved. A roller rotating mechanism is arranged on the inner side of the elastic hose 9 and connected to the output end of the driving mechanism; the driving mechanism is used to drive the roller rotating mechanism to rotate, and the roller rotating mechanism rotates while squeezing the elastic hose 9 evenly distributed in the vertical direction, driving the fluid to flow into the inlet of the liquid inlet separator 19 and transport it to the outlet of the liquid outlet separator 23, thereby realizing the fluid transportation process from single tube → multiple tubes → single tube, and each elastic hose 9 is squeezed and released with a continuous and uniform time difference, i.e., a phase difference, so that continuous low-pulsation transportation of the fluid is realized, which not only ensures that the roller mechanism has the lowest wear on the elastic hose 9, 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 9 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.

[0013] like Figure 7 As shown, the roller rotating mechanism includes a transmission shaft 3, an upper fixing plate 4, a bearing seat 13, a lower fixing plate 30 and a roller assembly. One end of the bearing seat 13 is connected to the mounting plate 15, and the other end of the bearing seat 13 is connected to the extrusion mechanism. One end of the transmission shaft 3 passes through the bearing seat 13 and is connected to the output end of the driving mechanism. The other end of the transmission shaft 3 extends into the extrusion mechanism. The two ends of the roller assembly are respectively connected to the transmission shaft 3 through the upper fixing plate 4 and the lower fixing plate 30. The roller assembly and the transmission shaft 3 are both located inside the elastic hose 9. Under the drive of the driving mechanism, the transmission shaft 3 drives the roller assembly to rotate and squeezes the elastic hose 9 evenly distributed in the vertical direction.

[0014] like Figure 7 As shown, the connection between the two ends of the bearing seat 13 and the transmission shaft 3 is provided with a third deep groove ball bearing 26 to ensure smooth rotation of the transmission shaft 3. The connection between the bearing seat 13 and the mounting plate 15 is provided with an O-ring 14 to prevent foreign matter from entering the interior of the bearing seat 13.

[0015] like Figure 7 As shown, the roller assembly includes a roller 8 and a roller shaft 28. The two ends of the roller shaft 28 are respectively connected to the upper fixing plate 4 and the lower fixing plate 30 by a first screw 6. The roller shaft 28 is nested in the roller 8, and a second deep groove ball bearing 5 is provided at the connection between the two ends of the roller 8 and the roller shaft 28.

[0016] like Figure 4 and Figure 5As shown, there are two groups of roller assemblies, which are symmetrically arranged on both sides of the transmission shaft 3, and the circumferential angle difference between the two groups of roller assemblies is 180°. Because the two groups of roller assemblies symmetrically distributed in the circumferential direction roll nine parallel and equidistant elastic hoses 9 while rotating, it can ensure that the roller 8 has the lowest wear on the elastic hose 9, and achieve the purpose of high-precision and large-capacity continuous filling.

[0017] like Figure 4 and Fig.10 As shown, the extrusion mechanism includes a front extrusion block 21, a rear extrusion block 25 and a locking assembly. The front extrusion block 21 and the rear extrusion block 25 are locked by the locking assembly to form an extrusion sleeve, which cooperates with the roller assembly to achieve extrusion of the elastic hose 9. A plurality of avoidance notches 32 are provided in the front extrusion block 21 and the rear extrusion block 25 along the vertical direction. When the front extrusion block 21 and the rear extrusion block 25 are locked, the formed extrusion sleeve forms evenly arranged avoidance notches 32 with equal angle differences in the circumferential direction, so that each elastic hose 9 has an arc length of not less than 180° in the circumferential direction to be rotated, squeezed or released.

[0018] like Figure 4 and Figure 5 As shown, the front extrusion block 21 and the rear extrusion block 25 enclose a cylindrical cavity, the axis of the transmission shaft 3 is located at the center of the cavity, and the radius of the cavity is R1; after the avoidance notch 32 is set on the inner wall of the front extrusion block 21 and the rear extrusion block 25, the distance from the avoidance notch 32 to the center of the cavity is R2, R2 is greater than R1, and the roller assembly extrude the elastic hose along the avoidance notch 32. In this embodiment, the angle difference β between adjacent avoidance notches 32 is between 30° and 60°.

[0019] like Figure 4 , Figure 8 , Fig. 9 and Fig.11 As shown, the locking assembly includes a handle 20, a locking nut 22, a locking screw 24, a first rotating pin 27 and a second rotating pin 29. One end of the locking nut 22 is connected to the handle 20 through the first rotating pin 27, and the other end of the locking nut 22 is detachably connected to one end of the locking screw 24. The other end of the locking screw 24 is provided with a second rotating pin 29. When the elastic hose 9 is installed, the locking screw 24 is passed through the side of the front extrusion block 21 and the side of the rear extrusion block 25. The second rotating pin 29 is used to realize the locking of the locking screw 24 and the side of the rear extrusion block 25. The locking screw 24 is locked with the side of the front extrusion block 21 through the locking nut 22, that is, the front extrusion block 21 and the rear extrusion block 25 are locked and connected. The elastic hose 9 can be quickly installed or replaced from the front extrusion block 21 and the rear extrusion block 25 through the locking assembly.

[0020] like Figure 6 and Figure 7As shown, the extrusion mechanism also includes an upper cover plate 10, a support plate 11 and a lower cover plate 12. The two ends of the support plate 11 are respectively connected to the upper cover plate 10 and the lower cover plate 12 to enclose a pump cover. The two ends of the front extrusion block 21 and the two ends of the rear extrusion block 25 are respectively connected to the upper cover plate 10 and the lower cover plate 12 through positioning pins 7 to prevent the front extrusion block 21 and the rear extrusion block 25 from moving in series. The connection between the transmission shaft 3 and the upper cover plate 10 and the lower cover plate 12 is provided with a first deep groove ball bearing 1 to ensure smooth rotation of the transmission shaft 3. One end of the bearing seat 13 is connected to the lower cover plate 12 by a fastening screw, and the other end of the bearing seat 13 is connected to the mounting plate 15 by a fastening screw.

[0021] like Figure 8 As shown, a liquid dispensing pipe mounting plate 18 is also connected to one side of the lower cover plate 12, and the liquid inlet dispensing pipe 19 and the liquid outlet dispensing pipe 23 are respectively connected and fixed to the liquid dispensing pipe mounting plate 18 by the second screw 31, that is, the liquid inlet dispensing pipe 19 and the liquid outlet dispensing pipe 23 are installed and fixed on the outside of the extrusion mechanism. During each filling, two groups of roller assemblies evenly distributed on the inner side of the circumference of the extrusion mechanism rotate and squeeze the nine elastic hoses 9 arranged in parallel and equidistantly on the extrusion sleeve, pushing the fluid to flow in from the liquid inlet at the front of the pump body, flow through the liquid inlet dispensing pipe 19, be divided into nine elastic hoses 9, gather into the liquid outlet dispensing pipe 23, and flow out from the liquid outlet at the rear of the pump body, realizing the fluid conveying process from single tube → multiple tubes → single tube, and there is a continuous and uniform time difference, that is, phase difference, between the extrusion and release of each elastic hose 9, realizing continuous metering and low-pulsation conveying of the fluid.

[0022] like Figure 7 and Fig. 9 As shown, the driving mechanism includes a reducer 16, a driving assembly 17 and an external PLC controller. The reducer 16 is mounted on the mounting plate 15, and the output end of the driving assembly 17 is connected to the roller rotating mechanism through the reducer 16. The driving assembly 17 is electrically connected to the PLC controller, and the PLC controller controls the driving assembly 17 to automatically operate, such as controlling the start and stop, forward and reverse rotation, full speed, speed regulation and flow calibration of the driving assembly 17, so as to improve the control accuracy of filling.

[0023] In this embodiment, the driving assembly 17 adopts a stepper motor. In other embodiments, the driving assembly 17 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 9 smoothly.

[0024] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A low pulsation roller inner rotating parallel multi-tube peristaltic pump, characterized in that: The invention comprises a mounting plate (15), wherein the mounting plate (15) is provided with an extrusion mechanism, a driving mechanism, a roller rotating mechanism and a pipeline mechanism, wherein the roller rotating mechanism is located inside the extrusion mechanism; the pipeline mechanism comprises a liquid inlet and liquid dispensing pipe (19), a liquid outlet and liquid dispensing pipe (23) and a plurality of elastic hoses (9), wherein the liquid inlet and liquid dispensing pipe (19) and the liquid outlet and liquid dispensing pipe (23) are arranged outside the extrusion mechanism in a vertical direction, and the plurality of elastic hoses (9) are arranged inside the extrusion mechanism in parallel and at equal distances in a vertical direction, and the two ends of the elastic hoses (9) are respectively connected to the liquid inlet and liquid dispensing pipe (19), and the plurality of elastic hoses (9) are arranged inside the extrusion mechanism in parallel and at equal distances. The roller rotating mechanism is located inside the elastic hose (9) and 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 (9) evenly distributed in the vertical direction, driving the fluid to flow into the inlet of the liquid inlet liquid dispensing pipe (19) and be transported to the outlet of the liquid outlet liquid dispensing pipe (23), 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 (9) is squeezed and released, thereby realizing continuous low-pulsation transport of the fluid.

2. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 1, characterized in that: The roller rotating mechanism comprises a transmission shaft (3), an upper fixing plate (4), a bearing seat (13), a lower fixing plate (30) and a roller assembly; one end of the bearing seat (13) is connected to the mounting table (15), the other end of the bearing seat (13) is connected to the extrusion mechanism, one end of the transmission shaft (3) passes through the bearing seat (13) and is connected to the output end of the driving mechanism, the other end of the transmission shaft (3) extends into the extrusion mechanism, the two ends of the roller assembly are respectively connected to the transmission shaft (3) through the upper fixing plate (4) and the lower fixing plate (30), the roller assembly and the transmission shaft (3) are both located inside the elastic hose (9), and under the drive of the driving mechanism, the transmission shaft (3) drives the roller assembly to rotate and squeezes the elastic hose (9) evenly distributed in the vertical direction.

3. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 2, characterized in that: A third deep groove ball bearing (26) is provided at the connection between the two ends of the bearing seat (13) and the transmission shaft (3); and an O-type sealing ring (14) is provided at the connection between the bearing seat (13) and the mounting plate (15).

4. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 2, characterized in that: The roller assembly comprises a roller (8) and a roller shaft (28), the two ends of the roller shaft (28) being respectively connected to an upper fixing plate (4) and a lower fixing plate (30), the roller shaft (28) being nested in the roller (8), and second deep groove ball bearings (5) are provided at the connection points between the two ends of the roller (8) and the roller shaft (28).

5. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 4, characterized in that: The roller assemblies are in two groups and are symmetrically arranged on both sides of the transmission shaft (3).

6. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 4, characterized in that: The extrusion mechanism comprises a front extrusion block (21), a rear extrusion block (25) and a locking assembly, wherein the front extrusion block (21) and the rear extrusion block (25) are locked by the locking assembly to form an extrusion sleeve; a plurality of avoidance notches (32) are provided in the front extrusion block (21) and the rear extrusion block (25) along the vertical direction, and when the front extrusion block (21) and the rear extrusion block (25) are locked, the formed extrusion sleeve forms evenly arranged avoidance notches (32) with equal angle differences in the circumferential direction, so that each elastic hose (9) has an arc length of not less than 180 degrees in the circumferential direction to be rotated, squeezed or released.

7. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 6, characterized in that: The locking assembly comprises a handle (20), a locking nut (22), a locking screw (24), a first rotating pin (27) and a second rotating pin (29); one end of the locking nut (22) is connected to the handle (20) via the first rotating pin (27), the other end of the locking nut (22) is detachably connected to one end of the locking screw (24), and the other end of the locking screw (24) is provided with a second rotating pin (29); the locking screw (24) passes through the side of the front extrusion block (21) and the side of the rear extrusion block (25), and is locked by the locking nut (22) to achieve a locking connection between the front extrusion block (21) and the rear extrusion block (25).

8. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 6, characterized in that: The extrusion mechanism further comprises an upper cover plate (10), a support plate (11) and a lower cover plate (12); two ends of the support plate (11) are respectively connected to the upper cover plate (10) and the lower cover plate (12); two ends of the front extrusion block (21) and two ends of the rear extrusion block (25) are respectively connected to the upper cover plate (10) and the lower cover plate (12) via positioning pins (7); a first deep groove ball bearing (1) is provided at the connection between the transmission shaft (3) and the upper cover plate (10) and the lower cover plate (12); and the bearing seat (13) is connected to the lower cover plate (12).

9. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to any one of claims 1 to 8, characterized in that: The driving mechanism comprises a reducer (16), a driving component (17) and an external PLC controller; the reducer (16) is mounted on a mounting plate (15), and an output end of the driving component (17) is connected to a roller rotating mechanism via the reducer (16); the driving component (17) is electrically connected to the PLC controller, and the PLC controller controls the operation of the driving component (17).

10. The low pulsation roller inner rotating parallel multi-tube peristaltic pump according to claim 9, characterized in that: The driving component (17) adopts a stepping motor or a servo motor or a motor driving unit.

Images