Peristaltic pump and material mixing method of peristaltic pump

Abstract

The invention discloses a peristaltic pump and a material mixing method of the peristaltic pump. The peristaltic pump comprises a driving assembly, a pump head and an elastic hose, the elastic hose is installed in an annular groove in the pump head, and the rolling wheel in the pump head is driven by the driving assembly to rotate so as to extrude the elastic hose. The pump head comprises a pump shell and a planetary gear, the annular groove is located in the inner side of the pump shell, a gear ring of the planetary gear is fixed in the pump shell, a sun gear and at least three planetary gears are arranged on the inner side of the gear ring, a planetary shaft of each planetary gear extends upwards, each planetary shaft is sleeved with a rotatable idler wheel, and the idler wheels are arranged on the outer side of the pump shell. The sun wheel is driven to rotate through the driving assembly, and then all the planet wheels drive the corresponding rolling wheels to extrude the elastic hose. According to the peristaltic pump, the function of mixing solutions and the function of mixing the solutions with powder materials and solid materials are added, and the technical defects of an existing peristaltic pump are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of peristaltic pumps, and in particular relates to a peristaltic pump and a material mixing method of the peristaltic pump. Background Art

[0002] The structure of a peristaltic pump mainly includes a driver, a pump head and an elastic hose. The driver drives the roller inside the pump head to squeeze the elastic hose, and the fluid is isolated and flows in the elastic hose. The characteristics of a peristaltic pump are no pollution, good sealing, and simple maintenance. Its application areas can involve the chemical industry, food industry, medical device industry, pharmaceutical industry, etc.

[0003] Existing peristaltic pumps only have the function of pumping liquids, and are mostly used to pump a single solution, and do not have the function of mixing multiple solutions or mixing solids and liquids. The main reason why existing peristaltic pumps cannot mix is ​​that multiple solution mixing or solid-liquid mixing requires direct contact with the agitator, and the characteristic of peristaltic pumps is that they are pumped in isolation through elastic hoses. Therefore, the method of mixing with agitators conflicts with the characteristics of peristaltic pumps, resulting in the single function of existing peristaltic pumps and the inability to break through technical bottlenecks.

[0004] In response to the above problems, patent publication number CN106132189A discloses a peristaltic pump injection system, which includes a peristaltic pump assembly configured to be installed in an apparatus for placing materials on or below the soil surface. The peristaltic pump has a rotor assembly that allows fluid additives to pass through an elastic tube to a manifold in precise amounts. Pressurized fluid is introduced into the manifold to mix in the pressurized fluid.

[0005] The above peristaltic pump injection system takes into account the isolation characteristics of the peristaltic pump and the mixing function of the peristaltic pump, but still has the following shortcomings: 1. The solution mixing is achieved by using a multi-solution mixed flow method, but the solution is not actually stirred, and the mixing effect is poor. In addition, this mixing method is ineffective for solid-liquid mixing.

[0006] 2. In addition to the isolation pumping characteristics of the peristaltic pump, it also has the ability to transport in both directions. If a mixed flow mixing method is used, a separate mixing pipeline must be added, and the mixing effect is proportional to the length of the mixing pipeline. Therefore, this mixing method is not completed inside the peristaltic pump, the mixing direction is irreversible, and a mixing pipeline must be equipped.

[0007] 3. Conventional peristaltic pumps are small in size and are often used in laboratories, medical equipment, analytical instruments and other fields. The installation space required for the peristaltic pump injection system formed by adding a mixing pipeline is significantly increased, and it cannot be used for equipment with limited installation. Summary of the invention

[0008] In view of the deficiencies of the prior art, the present invention provides a peristaltic pump, comprising a driving assembly, a pump head and an elastic hose; the elastic hose is installed in an annular groove inside the pump head, and the roller in the pump head is driven to rotate by the driving assembly to extrude the elastic hose; the pump head comprises a pump housing and a planetary gear, the annular groove is located on the inner side of the pump housing, the gear ring of the planetary gear is fixed in the pump housing, a sun gear and at least three planetary gears are provided on the inner side of the gear ring, the planetary shaft of each planetary gear extends upward, and each planetary shaft is sleeved with a rotatable roller, the sun gear is driven to rotate by the driving assembly, and then all the planetary wheels drive the corresponding rollers to extrude the elastic hose; the pump head also comprises a mixing assembly installed inside the pump housing, the mixing assembly comprises a transmission mechanism and a spiral extrusion wheel, at least one spiral extrusion wheel is provided between each two adjacent rollers, each spiral extrusion wheel extrude the elastic hose, and all the spiral extrusion wheels are connected to the sun shaft of the sun wheel through the transmission mechanism, and all the spiral extrusion wheels are driven to rotate by the sun shaft, so that the spiral extrusion wheels extrude the elastic hose and all the spiral extrusion wheels and all the rollers revolve synchronously around the sun wheel.

[0009] The preferred solution of the peristaltic pump in the present invention is: the pump housing is provided with a liquid outlet nozzle and a multi-head liquid inlet nozzle, and the liquid outlet nozzle and the multi-head liquid inlet nozzle are respectively connected to the two ends of the elastic hose. The multi-head liquid inlet nozzle is provided with at least two joints for connecting the liquid inlet pipeline, and the feeding speed of each liquid inlet pipeline can be fed according to the mixing ratio.

[0010] The preferred scheme of the peristaltic pump in the present invention is: the transmission mechanism includes a first bevel gear set, three sets of second bevel gear sets and three transmission shafts, two spiral extrusion wheels are arranged between each two adjacent rollers, each two adjacent spiral extrusion wheels are rotationally connected to one end of a transmission shaft through a set of second bevel gear sets, and the other end of the transmission shaft is transmission-connected to the sun shaft through the first bevel gear set, and the three transmission shafts are driven to rotate synchronously through the sun shaft, thereby rotating all the spiral extrusion wheels. Further, the central axis of each spiral extrusion wheel is coaxially fixed with a bevel wheel of the corresponding second bevel gear set, and the central axis of all spiral extrusion wheels and all transmission shafts are connected to the planetary shaft through a bracket, thereby causing the mixing assembly and the planetary shaft to revolve synchronously around the sun wheel. Each second bevel gear set is provided with three bevel wheels, two of which are coaxially fixed with the corresponding central axis, and another bevel wheel is coaxially fixed with the corresponding transmission shaft, and the bevel wheels of the transmission shaft and the bevel wheels of the central axis are in a meshing relationship at a certain angle. The first bevel gear set includes four bevel wheels, one of which is coaxially fixed with the sun shaft, and the other three bevel wheels are coaxially fixed with three transmission shafts respectively. The bevel wheels of the sun shaft and the transmission shaft are also meshed at a certain angle, and the specific angle is determined according to the installation space. The transmission mechanism changes the transmission direction, and the sun shaft drives the sun wheel and one of the bevel wheels in the first bevel gear set to rotate at the same time. Compared with peristaltic pumps of the same volume, the internal space of the pump casing is fully utilized, the transmission relationship is compact, and the transmission structure is reasonably distributed.

[0011] The preferred solution of the peristaltic pump in the present invention is: each transmission shaft is rotationally connected to the bracket, each central shaft is rotationally connected to the bracket, and the bracket is fixedly connected to the corresponding planetary shaft. The transmission shaft and the bracket, as well as the central shaft and the bracket, are rotationally connected by bearings, each planetary shaft is fixed and does not rotate, but the planetary wheels and rollers can rotate relative to the planetary shafts. After the bracket and the planetary shaft are fixed, the bracket drives all the transmission shafts and the central shaft to revolve synchronously around the sun wheel, so that all the spiral extrusion wheels revolve synchronously with the bracket while rotating, and each spiral extrusion wheel is kept between the corresponding two rollers, and the spiral extrusion wheel does not collide with the roller.

[0012] The preferred solution of the peristaltic pump in the present invention is that the diameter of each spiral extrusion wheel is larger than the outer diameter of the elastic hose, two adjacent spiral extrusion wheels among all the spiral extrusion wheels are located on the upper side of the elastic hose, and the other four spiral extrusion wheels are located on the inner side of the elastic hose. Since the outer side of the elastic hose is embedded in the annular groove, the spiral extrusion wheel can extrude the elastic hose synchronously with the roller from the inner side, and the spiral extrusion wheel can also extrude the elastic hose from the upper side. The extrusion from the inner side and the upper side has a better mixing effect on the materials in the elastic hose.

[0013] The preferred solution of the peristaltic pump in the present invention is: the driving assembly includes a servo motor and a controller, the output shaft of the servo motor is coaxially fixed with the sun shaft of the sun gear, and the output end of the controller is electrically connected to the servo motor. The servo motor can adjust the output torque in real time according to the load change through the closed-loop control system of the controller. In the speed control mode, when the torque load increases, the controller can automatically increase the current of the servo motor, thereby increasing the torque output under the premise of keeping the speed unchanged to maintain the set speed.

[0014] The peristaltic pump in the present invention has the following advantages: 1. Compared with the existing peristaltic pump, it has the function of mixing solutions, solutions, powder materials and solid materials. It is particularly suitable for mixing corrosive materials, infectious bacteria solutions, volatile hazardous materials, etc. It combines the two functions of isolation pumping and mixing to make up for the technical shortcomings of existing peristaltic pumps.

[0015] 2. The mixing component is installed inside the pump head. The mixing component uses the same power as the peristaltic pump, that is, the power output of the driving component drives the mixing component. The mixing in the pump is completed without adding external auxiliary equipment, meeting the one-way pumping requirements. The liquid outlet nozzle and the multi-head liquid inlet nozzle can be swapped to meet the two-way delivery requirements.

[0016] 3. Under the same power, the increased volume of the pump head does not exceed 1.2 times of the original volume. The corresponding installation space requirements are almost the same as those of the peristaltic pump under the same power, and the mixing component does not take up too much installation space.

[0017] The present invention also provides a mixing method of a peristaltic pump, based on the above-mentioned peristaltic pump, the steps are as follows: First, each joint of the multi-head liquid inlet nozzle is connected to a different liquid inlet pipeline, and the liquid outlet nozzle is connected to the liquid outlet pipeline. If the liquid inlet pipeline is a powder or granular material, the pipeline needs to be equipped with a spiral material conveyor to push the powder or granular material to reduce the suction load of the pump head. Then, according to the actual situation, the speed of the servo motor is adjusted to the set speed through the controller. The servo motor drives all rollers to rotate around the sun gear through the planetary gear, forming suction at the end of the multi-head liquid inlet nozzle. The material in at least one liquid inlet pipeline is a liquid material, and the materials in the remaining liquid inlet pipelines can be liquid materials, powder materials or fragile granular materials. All materials are sucked into the elastic hose. Finally, all the spiral extrusion wheels rotate with the sun axis to squeeze all the materials inside the adjacent elastic hoses. If the spiral extrusion wheel squeezes the powder material or granular material and causes the spiral extrusion wheel to increase the resistance, the controller increases the torque of the servo motor, and the set speed does not change. The material passing through the elastic hose is squeezed and mixed by the spiral extrusion wheel and then discharged to the liquid outlet pipeline, and the mixing is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the peristaltic pump in the present invention; Figure 2 for Figure 1 Illustration of the hidden part of the pump casing Figure 1 ; Figure 3 for Figure 1 Illustration of the hidden part of the pump casing Figure 2 ; Figure 4 for Figure 3 Schematic diagram after adding mixing components.

[0020] Figure numerals: drive assembly 1, pump head 2, pump housing 201, liquid outlet nozzle 202, multi-head liquid inlet nozzle 203, ring gear 204, sun gear 205, planetary gear 206, planetary shaft 207, roller 208, spiral extrusion wheel 209, sun shaft 210, first bevel gear set 211, second bevel gear set 212, transmission shaft 213, bracket 214, elastic hose 3. DETAILED DESCRIPTION

[0021] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0022] Embodiment 1; like Figure 1As shown, embodiment 1 provides a peristaltic pump, including a drive assembly 1, a pump head 2 and an elastic hose 3, wherein the drive assembly 1 includes a servo motor and a controller, and the controller is integrated in the housing of the servo motor, and the controller is not drawn in the figure. The output shaft of the servo motor is connected to the pump head 2 in a transmission manner, and the output end of the controller is electrically connected to the servo motor. The servo motor can adjust the output torque in real time according to the load change through the closed-loop control system of the controller. The elastic hose 3 is installed in the annular groove inside the pump head 2, and the pump housing 201 is provided with a liquid outlet 202 and a multi-head liquid inlet 203. The multi-head liquid inlet 203 is provided with two liquid inlet heads, and can also be three, four, etc., which is not limited in this embodiment. The liquid outlet nozzle 202 and the multi-head liquid inlet nozzle 203 are respectively connected to the two ends of the elastic hose 3. The servo motor of the driving component 1 drives the roller 208 in the pump head 2 to rotate to squeeze the elastic hose 3. Rolling friction is formed between the roller 208 and the elastic hose 3. The roller 208 squeezes the elastic hose 3 along the annular groove, forming suction at the multi-head liquid inlet nozzle 203, thereby forming a liquid pumping capacity.

[0023] The specific structure of the pump head 2 in this embodiment is as follows: like Figure 2 and Figure 3 As shown, the pump head 2 includes a pump housing 201 and a planetary gear, the annular groove is located inside the pump housing 201, the gear ring 204 of the planetary gear is fixed inside the pump housing 201, and a sun gear 205 and three planetary gears 206 are provided inside the gear ring 204. The number of the planetary gears 206 can be four, five, etc., which is not limited in this embodiment. The planetary shaft 207 of each planetary gear 206 extends upward, and the planetary shaft 207 is fixed on the planetary frame, and a rotatable roller 208 is sleeved on each planetary shaft 207, and the sun gear 205 is driven to rotate by the driving assembly 1, so that all the planetary gears 206 drive the corresponding rollers 208 to squeeze the elastic hose 3.

[0024] like Figure 4As shown, the pump head 2 also includes a mixing assembly installed inside the pump housing 201, and the mixing assembly includes a transmission mechanism and a spiral extrusion wheel 209. Two spiral extrusion wheels 209 are arranged between each two adjacent rollers 208. Each spiral extrusion wheel 209 extrudes the elastic hose 3, and all the spiral extrusion wheels 209 are connected to the sun shaft 210 of the sun gear 205 through the transmission mechanism. The sun shaft 210 drives all the spiral extrusion wheels 209 to rotate, so that the spiral extrusion wheels 209 extrudes the elastic hose 3 and all the spiral extrusion wheels 209 and all the rollers 208 revolve synchronously around the sun gear 205. In order to improve the mixing effect, the diameter of each spiral extrusion wheel 209 is larger than the outer diameter of the elastic hose 3. Under the extrusion of the spiral extrusion wheel 209, the deformation degree of the elastic hose 3 can reach 70-85%, which plays the role of extrusion and mixing for the materials in the elastic hose 3. Two adjacent spiral extrusion wheels 209 among all the spiral extrusion wheels 209 are located on the upper side of the elastic hose 3, and the other four spiral extrusion wheels 209 are located on the inner side of the elastic hose 3. Since the outer side of the elastic hose 3 is embedded in the annular groove, the spiral extrusion wheel 209 can extrude the elastic hose 3 from the inside synchronously with the roller 208, and the spiral extrusion wheel 209 can also extrude the elastic hose 3 from the top. The extrusion from the inside and the top can better mix the materials in the elastic hose 3.

[0025] The specific structure of the transmission mechanism is as follows: the transmission mechanism includes a first bevel gear set 211, three sets of second bevel gear sets 212 and three transmission shafts 213, two spiral extrusion wheels 209 are arranged between each two adjacent rollers 208, each two adjacent spiral extrusion wheels 209 are rotationally connected to one end of a transmission shaft 213 through a set of second bevel gear sets 212, and the other end of the transmission shaft 213 is transmission-connected to the sun shaft 210 through the first bevel gear set 211, and the three transmission shafts 213 are driven to rotate synchronously through the sun shaft 210, thereby rotating all the spiral extrusion wheels 209. Further, the central axis of each spiral extrusion wheel 209 is coaxially fixed with a corresponding bevel wheel of the second bevel gear set 212, and the central axes of all the spiral extrusion wheels 209 and all the transmission shafts 213 are connected to the planetary shaft 207 through the bracket 214, thereby causing the mixing assembly and the planetary shaft 207 to revolve synchronously around the sun gear 205. Each second bevel gear set 212 is provided with three bevel wheels, two of which are coaxially fixed with the corresponding central axis, and another bevel wheel is coaxially fixed with the corresponding transmission shaft 213, and the bevel wheels of the transmission shaft 213 are meshed with the bevel wheels of the central axis at a certain angle. The first bevel gear set 211 includes four bevel wheels, one of which is coaxially fixed with the sun shaft 210, and the other three bevel wheels are coaxially fixed with the three transmission shafts 213, and the bevel wheels of the sun shaft 210 are also meshed with the bevel wheels of the transmission shaft 213 at a certain angle, and the specific angle is determined according to the installation space. The transmission mechanism changes the transmission direction, and the sun shaft 210 drives the sun wheel 205 and one of the bevel wheels in the first bevel gear set 211 to rotate at the same time. Compared with peristaltic pumps of the same volume, the internal space of the pump housing 201 is fully utilized, the transmission relationship is compact, and the transmission structure is reasonably distributed.

[0026] In order to keep the current positions of all the spiral extrusion wheels 209 and the transmission mechanism unchanged relative to the roller 208, each transmission shaft 213 in this embodiment is rotationally connected to the bracket 214, each central shaft is rotationally connected to the bracket 214, and the bracket 214 is fixedly connected to the corresponding planetary shaft 207. The transmission shaft 213 and the bracket 214 and the central shaft and the bracket 214 are both rotationally connected by bearings, each planetary shaft 207 is fixed and does not rotate, but the planetary wheel 206 and the roller 208 can rotate relative to the planetary shaft 207. After the bracket 214 and the planetary shaft 207 are fixed, the bracket 214 drives all the transmission shafts 213 and the central shaft to revolve synchronously around the sun gear 205, so that all the spiral extrusion wheels 209 revolve synchronously with the bracket 214 while rotating, and each spiral extrusion wheel 209 is kept between the corresponding two rollers 208, and the spiral extrusion wheel 209 does not collide with the roller 208.

[0027] The specific transmission relationship in this embodiment is as follows: The servo motor drives the sun shaft 210 to rotate. On the one hand, the sun shaft 210 drives the sun gear 205 to rotate synchronously, and all the planetary gears 206 rotate due to meshing with the sun gear 205. The planetary carrier is located below the planetary gear 206, and the planetary carrier is fixed to the planetary shaft 207. The planetary gear 206 can rotate relative to the planetary shaft 207. After the planetary carrier rotates with the planetary gear 206, the planetary shaft 207 drives the roller 208 and the bracket 214 to revolve synchronously. On the other hand, one of the bevel wheels of the first bevel gear set 211 at the upper end of the sun shaft 210 rotates synchronously with the sun shaft 210, so that the other three bevel wheels in the first bevel gear set 211 rotate, and then the six spiral extrusion wheels 209 are driven to rotate while revolving around the sun gear 205 through the three transmission shafts 213 and the three sets of second bevel gear sets 212.

[0028] Embodiment 2: Embodiment 2 provides a mixing method of a peristaltic pump, based on the peristaltic pump of embodiment 1, and the specific method is: first, each joint of the multi-head liquid inlet nozzle 203 is connected to a different liquid inlet pipeline, and the liquid outlet nozzle 202 is connected to the liquid outlet pipeline. If the liquid inlet pipeline is a powder or granular material, the pipeline needs to be equipped with a spiral material conveyor for pushing the powder or granular material to reduce the suction load of the pump head 2.

[0029] Then, according to the actual situation, the speed of the servo motor is adjusted to the set speed through the controller. The servo motor drives all the rollers 208 to rotate around the sun gear 205 through the planetary gear, forming suction at the end of the multi-head liquid inlet nozzle 203. The material in at least one liquid inlet pipeline is liquid material, and the materials in the other liquid inlet pipelines can be liquid materials, powder materials or fragile granular materials. All materials are sucked into the elastic hose 3. If it is a powder material or a granular material, the liquid inlet pipeline needs to be equipped with a spiral material conveyor to push the powder material or the granular material into the elastic hose 3 to avoid insufficient suction of the pump head 2 resulting in a large error in the material delivery amount.

[0030] Finally, all the spiral extrusion wheels 209 rotate with the sun shaft 210 to squeeze all the materials inside the adjacent elastic hoses 3. If the spiral extrusion wheels 209 squeeze powder materials or granular materials and cause the resistance of the spiral extrusion wheels 209 to increase, the controller increases the torque of the servo motor and sets the speed unchanged. The granular materials are dissolved in the solution under the extrusion of the spiral extrusion wheels 209, but it is not suitable for granular materials that are not easily soluble or fragile. The materials passing through the elastic hose 3 are squeezed and mixed by the spiral extrusion wheels 209 and then discharged to the liquid outlet pipe, and the mixing is completed.

[0031] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A peristaltic pump, comprising a drive assembly, a pump head and an elastic hose; the elastic hose is installed in an annular groove inside the pump head, and the roller in the pump head is driven by the drive assembly to rotate to squeeze the elastic hose; Features: The pump head includes a pump housing and a planetary gear, the annular groove is located inside the pump housing, the gear ring of the planetary gear is fixed inside the pump housing, a sun gear and at least three planetary gears are provided inside the gear ring, the planetary shaft of each planetary gear extends upward, and each planetary shaft is sleeved with a rotatable roller, the sun gear is driven to rotate by the driving assembly, and then all the planetary gears drive the corresponding rollers to squeeze the elastic hose; The pump head also includes a mixing assembly installed inside the pump housing, the mixing assembly includes a transmission mechanism and a spiral extrusion wheel, at least one spiral extrusion wheel is arranged between every two adjacent rollers, each spiral extrusion wheel extrudes the elastic hose, and all the spiral extrusion wheels are connected to the sun shaft of the sun wheel through the transmission mechanism, and all the spiral extrusion wheels are driven to rotate through the sun shaft, so that the spiral extrusion wheels extrude the elastic hose, and all the spiral extrusion wheels and all the rollers revolve synchronously around the sun wheel.

2. A peristaltic pump according to claim 1, characterized in that: The pump housing is provided with a liquid outlet nozzle and a multi-head liquid inlet nozzle, and the liquid outlet nozzle and the multi-head liquid inlet nozzle are respectively connected with two ends of the elastic hose.

3. A peristaltic pump according to claim 2, characterized in that: The transmission mechanism includes a first bevel gear set, three sets of second bevel gear sets and three transmission shafts. Two spiral extrusion wheels are arranged between every two adjacent rollers. Every two adjacent spiral extrusion wheels are rotationally connected to one end of a transmission shaft through a set of second bevel gear sets, and the other end of the transmission shaft is transmission-connected to the sun shaft through the first bevel gear set. The three transmission shafts are driven to rotate synchronously through the sun shaft, thereby causing all the spiral extrusion wheels to rotate.

4. A peristaltic pump according to claim 3, characterized in that: The central axis of each spiral extrusion wheel is coaxially fixed with a corresponding bevel wheel of the second bevel gear set, and the central axes of all spiral extrusion wheels and all transmission shafts are connected to the planetary shafts through brackets, so that the mixing assembly and the planetary shafts revolve synchronously around the sun wheel.

5. A peristaltic pump according to claim 4, characterized in that: Each transmission shaft is rotatably connected to the bracket, each central shaft is rotatably connected to the bracket, and the bracket is fixedly connected to the corresponding planetary shaft.

6. A peristaltic pump according to claim 5, characterized in that: The diameter of each spiral extrusion wheel is greater than the outer diameter of the elastic hose. Two adjacent spiral extrusion wheels among all the spiral extrusion wheels are located on the upper side of the elastic hose, and the other four spiral extrusion wheels are located on the inner side of the elastic hose.

7. A peristaltic pump according to claim 6, characterized in that: The driving assembly comprises a servo motor and a controller. The output shaft of the servo motor is coaxially fixed with the sun shaft of the sun gear, and the output end of the controller is electrically connected to the servo motor.

8. A mixing method of a peristaltic pump, characterized in that: Based on the peristaltic pump described in claim 7, the steps are as follows: S1, each joint of the multi-head liquid inlet nozzle is connected to a different liquid inlet pipeline, and the liquid outlet nozzle is connected to the liquid outlet pipeline; S2, adjust the speed of the servo motor to the set speed through the controller; S3, the servo motor drives all the rollers to rotate around the sun gear through the planetary gear, forming suction at the multi-head liquid inlet nozzle end, the material in at least one liquid inlet pipe is liquid material, and the materials in the other liquid inlet pipes can be liquid materials, powder materials or fragile granular materials, and all materials are sucked into the elastic hose; S4. All the spiral extrusion wheels rotate with the sun shaft to squeeze all the materials inside the adjacent elastic hoses. If the spiral extrusion wheels squeeze powder materials or granular materials and the resistance of the spiral extrusion wheels increases, the controller increases the torque of the servo motor and sets the speed unchanged; S5. The material passing through the elastic hose is squeezed and mixed by the spiral extrusion wheel and then discharged to the liquid outlet pipe, and the mixing is completed.

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