Low-pulsation spiral extrusion type multi-pipe peristaltic pump

Abstract

The utility model discloses a low-pulsation spiral extrusion type multi-pipe peristaltic pump, a pump sleeve and a driving mechanism are arranged on a mounting bedplate, and a spiral pipe pressing mechanism and a pipeline mechanism are both positioned in the pump sleeve; the spiral pipe pressing mechanism comprises a spiral eccentric roller assembly and a transmission assembly connected with the driving mechanism, and the spiral eccentric roller assembly surrounds the outer side of the transmission assembly. The pipeline mechanism comprises elastic hoses and liquid separation assemblies, the two ends of the elastic hoses are connected with the liquid separation assemblies respectively, and the multiple elastic hoses are evenly distributed on the outer side of the spiral eccentric roller assembly in the circumferential direction; the driving mechanism drives the transmission wheel assembly to rotate, drives the spiral eccentric roller assembly to rotate and extrudes the elastic hose, and continuous metering and conveying of fluid are achieved. The peristaltic pump has the characteristics that one pipe flows in, a plurality of pipes which are distributed circumferentially and uniformly are rotationally extruded and loosened at the same phase difference and are gathered into one pipe to flow out, pulsation during fluid transmission is reduced, and the problem that fluid is polluted due to the fact that the inner wall of a hose is seriously abraded and a large number of particles are generated in an existing peristaltic pump is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fluid filling pump, concretely relates to a low pulsation spiral extrusion type multi-tube peristaltic pump. BACKGROUND

[0002] The peristaltic pump is a liquid delivery device capable of controlling flow rate, and the peristaltic pump utilizes a rotating roller to roll and press a flexible hose, and the fluid in the hose moves along with the rotation of the roller, just like squeezing the hose with two fingers, and along with the movement of the fingers, the liquid flows.

[0003] The existing peristaltic pump relies on the roller assembly with a rotating device to rotate and press the hose to discharge the fluid, and for the same hose, the roller squeezes or rolls the hose at the same position each time of filling, and the inner wall of the hose is seriously worn and a large number of particles are easily generated, which causes the fluid to be contaminated.

[0004] The existing peristaltic pump relies on the number of turns or the angle of the roller assembly to control the rolling and extrusion amount of the fluid. For each filling, the initial position and the end position of the roller assembly to roll the hose will not be at the same position due to the accumulation of the number of turns or the angle, and in addition, the elastic recovery of the hose at different positions also has differences, so that the continuous filling accuracy of the traditional peristaltic pump is difficult to achieve the expected effect. SUMMARY

[0005] The utility model solves the technical problems of effectively reducing the pulsation of the existing peristaltic pump during fluid transmission, solving the problems of serious wear of the inner wall of the hose, easy generation of a large number of particles, fluid contamination, and low continuous filling accuracy, and provides a low pulsation spiral extrusion type multi-tube peristaltic pump with 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] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of low pulsation helical extrusion type multi-tube peristaltic pump, including mounting platform, which is equipped with pump cover, driving mechanism, spiral pressure pipe mechanism and pipeline mechanism on the mounting platform, and the spiral pressure pipe mechanism and pipeline mechanism are located in pump cover;The spiral pressure pipe mechanism includes transmission assembly and spiral eccentric roller assembly, and the spiral eccentric roller assembly is arranged outside the transmission assembly, and the transmission assembly is connected with the output end of driving mechanism;The pipeline mechanism includes liquid distribution assembly and several elastic hoses, and the bottom and top of the pump cover are equipped with liquid distribution assembly, and the two ends of the elastic hose are connected with corresponding liquid distribution assembly respectively, and several elastic hoses are distributed in the circumferential direction outside the spiral eccentric roller assembly;Under the driving of driving mechanism, transmission wheel assembly rotates, drives spiral eccentric roller assembly to rotate and extrude the elastic hose distributed in the circumferential direction, drives fluid to be transported from the liquid inlet of the liquid distribution assembly at the bottom of pump cover to the liquid outlet of the liquid distribution assembly at the top of pump cover, realizes the fluid transportation process from single tube to multi-tube to single tube, and there is continuous and uniform time difference, i.e.

[0008] As a further improvement of the utility model, the transmission assembly includes a transmission shaft, an upper bearing seat and a lower bearing seat. The bottom of the lower bearing seat is connected and fixed with the mounting platform, and the top of the lower bearing seat is connected and fixed with the bottom of the pump cover. The bottom of the transmission shaft penetrates the bottom of the pump cover, the lower bearing seat and the mounting platform in sequence and is connected with the output end of the driving mechanism. The top of the transmission shaft is connected with the inside of the top of the pump cover through the upper bearing seat. The spiral eccentric roller assembly is arranged outside the transmission shaft.

[0009] As a further improvement of the utility model, the transmission assembly further includes a first deep groove ball bearing, a bushing and a third deep groove ball bearing. The inside of the lower bearing seat is rotatably connected with the transmission shaft through the first deep groove ball bearing at both ends, and the bushing is arranged between the two first deep groove ball bearings. The third deep groove ball bearing is arranged at the connection between the top of the transmission shaft and the upper bearing seat.

[0010] As a further improvement of the utility model, the transmission assembly further includes a gasket. The gasket is nested and fixed outside the transmission shaft and located at the top of the spiral eccentric roller assembly to limit the displacement of the spiral eccentric roller assembly.

[0011] As a further improvement of the utility model, the spiral eccentric roller assembly includes an eccentric sleeve, a second deep groove ball bearing and a roller. The eccentric sleeve is nested and fixed outside the transmission shaft in the vertical direction. The rollers are nested outside the eccentric sleeve in the vertical direction in sequence to form a spiral distributed eccentric roller group. The rollers are uniformly distributed in the circumferential direction. The second deep groove ball bearing is arranged between the roller and the eccentric sleeve. The number of the rollers is the same as that of the elastic hoses.

[0012] As a further improvement of the utility model, the spiral eccentric roller assembly further comprises a flat key, both ends of the flat key are respectively nested in the transmission shaft and the eccentric sleeve, so as to realize the connection and fixation of the transmission shaft and the eccentric sleeve.

[0013] As a further improvement of the utility model, the liquid distribution assembly comprises a lower liquid distribution plate and an upper liquid distribution plate, the lower liquid distribution plate and the upper liquid distribution plate enclose a liquid distribution channel, the side of the lower liquid distribution plate is provided with an inlet and outlet joint, so as to realize the fluid inlet and outlet of the liquid distribution channel; the upper liquid distribution plate is uniformly provided with a plurality of pipe joints, so as to be connected with the elastic hose.

[0014] As a further improvement of the utility model, the driving mechanism comprises a driving assembly and an external PLC controller; the driving assembly is installed on the installation table plate, and the output end of the driving assembly is connected with the transmission shaft; the driving assembly and the PLC controller are electrically connected, and the PLC controller controls the driving assembly to run.

[0015] As a further improvement of the utility model, the driving mechanism further comprises a supporting rod and a shaft coupling; the driving assembly is installed and fixed on the installation table plate through the supporting rod, and the output end of the driving assembly is connected with the transmission shaft through the shaft coupling.

[0016] As a further improvement of the utility model, the driving assembly adopts a stepping motor or a servo motor or a motor driving unit.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] This utility model discloses a low-pulsation spiral compression multi-tube peristaltic pump. The pump housing, drive mechanism, spiral compression mechanism, and piping mechanism are mounted on a platform, with both the spiral compression mechanism and piping mechanism housed within the pump housing, forming the main structure of the peristaltic pump. Specifically, the spiral compression mechanism includes a transmission assembly connected to the drive mechanism and a spiral eccentric roller assembly. The spiral eccentric roller assembly is arranged around the outside of the transmission assembly and is driven to rotate by the transmission assembly. The piping mechanism includes a liquid distribution assembly and several elastic hoses. The two ends of the elastic hoses are connected to corresponding liquid distribution assemblies, and the elastic hoses are evenly distributed circumferentially around the outside of the spiral eccentric roller assembly to reduce the overall installation volume of the peristaltic pump. Driven by the drive mechanism, the transmission assembly rotates, causing the spiral eccentric roller assembly to rotate and compress the evenly distributed elastic hoses, driving fluid from the inlet of the lower liquid distribution assembly to the higher liquid distribution assembly. The liquid delivery system utilizes a single-pipe → multi-pipe → single-pipe flow mechanism. The continuous and uniform time difference (phase difference) between the compression and release of each flexible hose ensures continuous, low-pulsation metering and delivery of the fluid. For a single flexible hose, during a single filling process, the helical eccentric rollers sequentially compress the hose's outer wall from bottom to top, preventing the rollers from compressing or spinning the hose in the same position during each filling. The flexible hose also periodically recovers its elasticity. Because the rollers rotate synchronously to compress the flexible hose, the shearing of liquid molecules and wear on the hose are minimized. This avoids the risk of fluid contamination due to severe wear on the hose's inner wall and the generation of numerous particles, effectively extending the pump's service life. Since the flexible hose is always under compression during the rotation of the helical eccentric roller assembly, continuous fluid delivery is ensured, significantly improving continuous filling accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the low-pulsation spiral extrusion multi-tube peristaltic pump in a specific embodiment of this utility model.

[0020] Figure 2 This is a top view schematic diagram of the low-pulsation spiral extrusion multi-tube peristaltic pump in a specific embodiment of the present invention.

[0021] Figure 3 for Figure 1 A schematic diagram of the structural principle of the cross-section along the AA direction.

[0022] Figure 4 for Figure 1 A schematic diagram of the structural principle of the cross-section along the BB direction.

[0023] Figure 5 for Figure 1 A schematic diagram of the cross-sectional structure along the CC direction.

[0024] Figure 6 forFigure 4 A schematic diagram of the sectional structure along the DD direction.

[0025] Figure 7 This is a three-dimensional isometric structural schematic diagram of the low-pulsation spiral extrusion multi-tube peristaltic pump after removing the cover plate and transmission wheel in a specific embodiment of this utility model.

[0026] Legend: 1. Support rod; 2. Coupling; 3. Drive shaft; 4. First deep groove ball bearing; 5. Mounting platform; 6. First O-ring seal; 7. Bushing; 8. Lower distribution plate; 91. Inlet connector; 92. Outlet connector; 10. Second O-ring seal; 11. Upper distribution plate; 12. Pipe connector; 13. Flexible hose; 14. Eccentric sleeve; 15. Second deep groove ball bearing; 16. Roller; 17. Upper bearing housing; 18. Pump sleeve; 19. Gasket; 20. First screw; 21. Third deep groove ball bearing; 22. Second screw; 23. Third screw; 24. Lower bearing housing; 25. Drive assembly; 26. Fourth screw; 27. Spring washer; 28. Third O-ring seal; 29. ​​Flat key. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0028] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0030] Example

[0031] like Figures 1 to 7As shown, the low-pulsation spiral extrusion multi-tube peristaltic pump of this utility model includes a mounting plate 5. The mounting plate 5 is equipped with a pump sleeve 18, a drive mechanism, a spiral tube pressing mechanism, and a pipeline mechanism. Both the spiral tube pressing mechanism and the pipeline mechanism are located within the pump sleeve 18. The spiral tube pressing mechanism includes a transmission assembly and a spiral eccentric roller assembly. The spiral eccentric roller assembly is arranged around the outside of the transmission assembly, and the transmission assembly is connected to the output end of the drive mechanism. The pipeline mechanism includes a liquid distribution assembly and several elastic hoses 13. Liquid distribution assemblies are provided at both the bottom and top of the pump sleeve 18. The two ends of the elastic hoses 13 are respectively connected to the corresponding liquid distribution assemblies. Several elastic hoses 13 are evenly distributed circumferentially outside the spiral eccentric roller assembly. Driven by the drive mechanism, the transmission wheel assembly rotates, which in turn drives the spiral eccentric roller assembly to rotate and squeeze the circumferentially distributed elastic hoses 13. This causes the fluid to be transported from the liquid distribution component inlet at the bottom of the pump sleeve 18 to the liquid distribution component outlet at the top of the pump sleeve 18, thus realizing the fluid transport process from single tube → multiple tubes → single tube. Furthermore, there is a continuous and uniform time difference, i.e., phase difference, between the squeezing and releasing of each elastic hose 13, which enables continuous metering and low-pulsation fluid transport.

[0032] Furthermore, such as Figure 1 , Figure 2 and Figure 7 As shown, the pump sleeve 18 has a hollow cylindrical cavity structure, and is formed by two semi-circular cavities connected by a third screw 23. A spring washer 27 is also provided between the third screw 23 and the pump sleeve 18 to improve the sealing of the connection.

[0033] In this embodiment, the main structure of the peristaltic pump is formed by setting a pump sleeve 18, a drive mechanism, a spiral tube pressing mechanism, and a pipeline mechanism on the mounting plate 5, with the spiral tube pressing mechanism and the pipeline mechanism both located inside the pump sleeve 18. Specifically, the spiral tube pressing mechanism includes a transmission component connected to the drive mechanism and a spiral eccentric roller assembly. The spiral eccentric roller assembly is arranged around the outside of the transmission component and is driven to rotate by the transmission component. The pipeline mechanism includes a liquid distribution component and several elastic hoses 13. The two ends of the elastic hoses 13 are respectively connected to the corresponding liquid distribution components, and the several elastic hoses 13 are evenly distributed around the outside of the spiral eccentric roller assembly in the circumferential direction to reduce the overall installation volume of the peristaltic pump. Driven by the drive mechanism, the transmission wheel assembly rotates, which in turn drives the spiral eccentric roller assembly to rotate and squeeze the circumferentially distributed elastic hoses 13, thus transporting the fluid from the liquid inlet of the liquid distribution assembly at a lower position to the liquid outlet of the liquid distribution assembly at a higher position. This achieves the fluid transport process from single tube → multiple tubes → single tube. Furthermore, there is a continuous and uniform time difference, i.e., phase difference, between the squeezing and releasing of each elastic hose 13, which enables continuous metering and low-pulsation fluid transport. For a single flexible hose 13, during a single filling process, the helical eccentric rollers sequentially press against the outer wall of the hose from bottom to top, avoiding the rollers pressing or twisting the hose in the same position each time the hose is filled. Moreover, the flexible hose 13 can also periodically recover its elasticity. Since the rollers rotate synchronously to press the flexible hose 13, the shearing of the liquid molecules and the wear on the hose can be minimized. This avoids the risk of fluid contamination caused by severe wear on the inner wall of the hose and the generation of a large number of particles, effectively extending the service life of the pump pipe. Because the flexible hose is always in a compressed state during the rotation of the helical eccentric roller assembly, the fluid is continuously transported, greatly improving the continuous filling accuracy.

[0034] like Figure 1 and Figure 4 As shown, the transmission assembly includes a drive shaft 3, an upper bearing housing 17, and a lower bearing housing 24. The bottom of the lower bearing housing 24 is fixedly connected to the mounting plate 5, and a first O-ring seal 6 is provided between the lower bearing housing 24 and the mounting plate 5 for sealing. The top of the lower bearing housing 24 is fixedly connected to the bottom of the pump sleeve 18. The bottom of the drive shaft 3 passes through the bottom of the pump sleeve 18, the lower bearing housing 24, and the mounting plate 5 in sequence, and is connected to the output end of the drive mechanism. The top of the drive shaft 3 is connected to the inner side of the top of the pump sleeve 18 through the upper bearing housing 17. A helical eccentric roller assembly is arranged around the outside of the drive shaft 3.

[0035] Furthermore, such as Figure 6 As shown, the upper bearing housing 17 is fixed to the inner side of the top of the pump sleeve 18 by three first screws 20, so as to ensure that the drive shaft 3 is securely installed in the pump sleeve 18.

[0036] like Figure 4As shown, the transmission assembly also includes a first deep groove ball bearing 4, a bushing 7, and a third deep groove ball bearing 21. Both ends of the lower bearing housing 24 are rotatably connected to the transmission shaft 3 via the first deep groove ball bearings 4, and a bushing 7 is provided between the two first deep groove ball bearings 4. A third deep groove ball bearing 21 is provided at the connection between the top of the transmission shaft 3 and the upper bearing housing 17 to ensure smooth rotation of the transmission shaft 3.

[0037] like Figure 4 As shown, the transmission assembly also includes a shim 19, which is nested and fixed to the outside of the transmission shaft 3 and located on top of the helical eccentric roller assembly to limit the displacement of the helical eccentric roller assembly.

[0038] like Figure 1 and Figure 4 As shown, the spiral eccentric roller assembly includes an eccentric sleeve 14, a second deep groove ball bearing 15, and rollers 16. The eccentric sleeve 14 is nested and fixed to the outside of the drive shaft 3 in a vertical direction. Twelve rollers 16 are nested sequentially to the outside of the eccentric sleeve 14 in a vertical direction to form a spirally upward distributed eccentric roller group. The twelve rollers 16 are evenly distributed in the circumferential direction, and the circumferential angle between adjacent rollers 16 is 30°. The second deep groove ball bearing 15 is provided between the rollers 16 and the eccentric sleeve 14 to enable the rollers 16 to compress the elastic hose 13 while rotating.

[0039] like Figure 5 As shown, the spiral eccentric roller assembly also includes a flat key 29, with both ends of the flat key 29 nested in the drive shaft 3 and the eccentric sleeve 14, respectively, to improve the connection stability between the drive shaft 3 and the eccentric sleeve 14.

[0040] like Figure 1 and Figure 4 As shown, the liquid separation assembly includes a lower liquid separation plate 8 and an upper liquid separation plate 11. The lower liquid separation plate 8 and the upper liquid separation plate 11 form a liquid separation channel. The lower liquid separation plate 8 is provided with inlet and outlet liquid connectors on its side to realize the flow of fluid into and out of the liquid separation channel. The upper liquid separation plate 11 is evenly distributed with multiple pipe connectors 12 for connecting flexible hoses 13.

[0041] Furthermore, such as Figure 3 As shown, at the bottom of the pump sleeve 18, the lower distribution plate 8 is connected and fixed to the lower bearing seat 24 by three first screws 20. Figure 2 As shown, at the top of the pump sleeve 18, the lower distribution plate 8 is connected and fixed to the pump sleeve 18 by multiple fourth screws 26. Figure 4 As shown, a second O-ring 10 and a third O-ring 28 are respectively provided on both sides of the liquid distribution channel formed by the lower liquid distribution plate 8 and the upper liquid distribution plate 11 to ensure the airtightness of the liquid distribution channel and prevent fluid leakage.

[0042] During each filling, the spiral eccentric roller assembly rotates and squeezes the twelve flexible hoses 13, pushing the fluid into the pump body through the inlet port 91 at the bottom. The fluid flows through the distribution channel formed by the lower distribution plate 8 and the upper distribution plate 11 at the bottom of the pump sleeve 18, and is distributed to the twelve pipe joints 12, the twelve flexible hoses 13, and the twelve pipe joints 12. The fluid then flows out through the outlet port 92 at the top of the pump body through the distribution channel formed by the upper distribution plate 8 and the upper distribution plate 11 at the top of the pump sleeve 18.

[0043] like Figure 1 , Figure 4 and Figure 7 As shown, the drive mechanism includes a drive assembly 25 and an external PLC controller (not shown in the figure). The drive assembly 25 is mounted on the mounting plate 5, and the output end of the drive assembly 25 is connected to the drive shaft 3; the drive assembly 25 and the PLC controller are electrically connected, and the PLC controller controls the operation of the drive assembly 25.

[0044] like Figure 7 As shown, the drive mechanism also includes support rods 1 and couplings 2. The drive assembly 25 is mounted and fixed on the mounting plate 5 by multiple support rods 1, and the output end of the drive assembly 25 is connected to the transmission shaft 3 through the couplings 2.

[0045] Furthermore, the drive assembly 25 uses a stepper motor, which features simple installation and precise control. In other embodiments, the drive assembly 25 can also use a servo motor or a motor drive unit, as long as it can drive the spiral eccentric roller assembly to rotate smoothly to achieve continuous material metering and conveying.

[0046] In this embodiment, the drive assembly 25 drives the coupling 2 and the transmission shaft 3 to rotate. The transmission shaft 3 drives the spiral eccentric roller assembly to rotate. The twelve spiral rollers 16 (evenly distributed at 30° angles along the circumference, spiraling upwards) rotate and squeeze the elastic hoses 13 evenly distributed along the circumference, driving the fluid from the lower inlet to the higher outlet. Because the twelve eccentric rollers 16 evenly distributed along the circumference spirally squeeze the twelve elastic hoses 13 evenly distributed along the circumference, the wear of the rollers 16 on the elastic hoses 13 is minimized, while achieving high-precision continuous filling.

[0047] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the technical solutions of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A low-pulsation spiral extrusion multi-tube peristaltic pump, characterized in that, The system includes a mounting plate (5), on which a pump sleeve (18), a drive mechanism, a spiral pressing mechanism, and a pipeline mechanism are provided. The spiral pressing mechanism and the pipeline mechanism are both located inside the pump sleeve (18). The spiral pressing mechanism includes a transmission assembly and a spiral eccentric roller assembly. The spiral eccentric roller assembly is arranged around the outside of the transmission assembly, and the transmission assembly is connected to the output end of the drive mechanism. The pipeline mechanism includes a liquid distribution assembly and several elastic hoses (13). The pump sleeve (18) is provided with liquid distribution assemblies at both the bottom and top. The two ends of the elastic hoses (13) are respectively... Connect the corresponding liquid distribution components. Several elastic hoses (13) are evenly distributed on the outside of the spiral eccentric roller assembly along the circumferential direction. Under the drive of the drive mechanism, the transmission wheel assembly rotates, which drives the spiral eccentric roller assembly to rotate and squeeze the elastic hoses (13) evenly distributed in the circumferential direction. This drives the fluid to be transported from the liquid distribution component inlet at the bottom of the pump sleeve (18) to the liquid distribution component outlet at the top of the pump sleeve (18), realizing the fluid transport process from single tube → multiple tubes → single tube. Moreover, there is a continuous and uniform time difference, i.e., phase difference, between the squeezing and releasing of each elastic hose (13), realizing continuous metering and low-pulsation transport of fluid.

2. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 1, characterized in that, The transmission assembly includes a transmission shaft (3), an upper bearing seat (17), and a lower bearing seat (24). The bottom of the lower bearing seat (24) is connected and fixed to the mounting plate (5), and the top of the lower bearing seat (24) is connected and fixed to the bottom of the pump sleeve (18). The bottom of the transmission shaft (3) passes through the bottom of the pump sleeve (18), the lower bearing seat (24), and the mounting plate (5) in sequence, and is connected to the output end of the drive mechanism. The top of the transmission shaft (3) is connected to the inner side of the top of the pump sleeve (18) through the upper bearing seat (17). The spiral eccentric roller assembly is arranged around the outside of the transmission shaft (3).

3. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 2, characterized in that, The transmission assembly also includes a first deep groove ball bearing (4), a bushing (7) and a third deep groove ball bearing (21); both ends of the lower bearing housing (24) are rotatably connected to the transmission shaft (3) through the first deep groove ball bearing (4), and a bushing (7) is provided between the two first deep groove ball bearings (4); a third deep groove ball bearing (21) is provided at the connection between the top of the transmission shaft (3) and the upper bearing housing (17).

4. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 3, characterized in that, The transmission assembly also includes a liner (19) which is nested and fixed to the outside of the transmission shaft (3) and located on top of the helical eccentric roller assembly to limit the displacement of the helical eccentric roller assembly.

5. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 4, characterized in that, The spiral eccentric roller assembly includes an eccentric sleeve (14), a second deep groove ball bearing (15), and rollers (16). The eccentric sleeve (14) is nested and fixed on the outside of the transmission shaft (3) in the vertical direction. Multiple rollers (16) are nested on the outside of the eccentric sleeve (14) in the vertical direction to form a spirally distributed eccentric roller group. The multiple rollers (16) are evenly distributed in the circumferential direction. A second deep groove ball bearing (15) is provided between the rollers (16) and the eccentric sleeve (14). The number of rollers (16) is the same as the number of elastic hoses (13).

6. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 5, characterized in that, The spiral eccentric roller assembly also includes a flat key (29), the two ends of which are nested in the drive shaft (3) and the eccentric sleeve (14) respectively, so as to realize the connection and fixation between the drive shaft (3) and the eccentric sleeve (14).

7. The low-pulsation spiral extrusion multi-tube peristaltic pump according to any one of claims 1 to 5, characterized in that, The liquid separation assembly includes a lower liquid separation plate (8) and an upper liquid separation plate (11). The lower liquid separation plate (8) and the upper liquid separation plate (11) form a liquid separation channel. The lower liquid separation plate (8) is provided with inlet and outlet connectors on its side to enable fluid to enter and exit the liquid separation channel. The upper liquid separation plate (11) is evenly distributed with multiple pipe connectors (12) for connecting flexible hoses (13).

8. The low-pulsation spiral extrusion multi-tube peristaltic pump according to any one of claims 1 to 5, characterized in that, The drive mechanism includes a drive assembly (25) and an external PLC controller; the drive assembly (25) is mounted on a mounting plate (5), and the output end of the drive assembly (25) is connected to the transmission shaft (3); the drive assembly (25) and the PLC controller are electrically connected, and the PLC controller controls the operation of the drive assembly (25).

9. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 8, characterized in that, The drive mechanism also includes a support rod (1) and a coupling (2); the drive assembly (25) is mounted and fixed on the mounting plate (5) via the support rod (1), and the output end of the drive assembly (25) is connected to the transmission shaft (3) via the coupling (2).

10. The low-pulsation spiral extrusion multi-tube peristaltic pump according to claim 8, characterized in that, The drive component (25) is a stepper motor, a servo motor, or a motor drive unit.

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