A peristaltic pump for experimental testing

Abstract

The present invention relates to the technical field of peristaltic pumps, and particularly relates to a peristaltic pump for experimental testing, comprising: a pump housing; a hose fixedly installed on the inner wall of the pump housing, the hose being provided with a water inlet and a water outlet; a driving assembly, a chute is formed in the pump housing, a displacement block is slidably installed in the chute, and a short shaft is rotatably installed in the displacement block. By providing a spare extrusion assembly, when the concentration and viscosity of the liquid increase, the spare extrusion assembly is inserted into the main shaft, and through the magnetic repulsion force of the second electromagnet, the distance between the newly inserted extrusion assembly and the original extrusion assembly is made equal, so as to keep the hose uniformly extruded, make the transported liquid stable, avoid fluctuations in the pressure caused by the extrusion of the hose, and the increased quantity can increase the pushing force on the liquid with higher concentration and viscosity, so that the liquid can pass through the hose more smoothly and reduce the fluctuations of the liquid during the pumping process.

Description

Technical Field

[0001] The present invention relates to the technical field of peristaltic pumps, and particularly to a peristaltic pump for experimental testing. Background Art

[0002] A peristaltic pump is a special type of pump mainly used for transporting fluids. The peristaltic pump transports fluids by compressing a flexible pipe, which has the characteristic that the fluid is completely isolated from the pump components, avoiding contamination or corrosion, and is suitable for fields such as chemical transportation, pharmaceuticals, food, and water treatment. Peristaltic pumps are mainly used for precise liquid supply. In mass spectrometry, the precise flow rate and stability of liquid samples are crucial. Especially in a liquid chromatography - mass spectrometry system, the peristaltic pump can precisely control the flow of liquid by compressing the flexible pipe to ensure the stable transportation of samples in the mass spectrometer.

[0003] There are many existing types of peristaltic pumps. For example, the patent with the publication number CN118517402B discloses a peristaltic pump with adjustable flow rate. This device adjusts the flow rate of the peristaltic pump by changing the rotational speed of the rotating frame. Among them, when supplying sample liquid to a mass spectrometer, the concentration and viscosity of the pumped liquid will be different. For liquids with different concentrations and viscosities, the common practice is to use thicker and more pressure-resistant pipes, or select pipes that are wear-resistant and corrosion-resistant. These pipes can ensure the normal operation of the peristaltic pump for a long time and prevent leakage or damage. However, the cost of replacing pipes is relatively high, and choosing the appropriate material requires considering the specific characteristics of the liquid. For example, high-concentration or high-viscosity liquids may require a more robust pipe design;

[0004] In addition, the prior art adjusts the flow rate of transporting liquids with different concentrations and viscosities by adjusting the rotational speed of the pump. However, increasing the rotational speed usually brings a series of adverse effects to the transportation system of high-viscosity and high-concentration liquids. For example, as the rotational speed increases, the frictional force between the liquid and the pipe wall will increase, resulting in increased energy consumption; at the same time, the pressure fluctuation inside the pipe will also intensify, which may cause pipe vibration or damage. Summary of the Invention

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides a peristaltic pump for experimental testing, which can effectively solve the problem in the prior art that when the liquid viscosity and concentration are too high, the service life of the delivery pipe is reduced due to high-speed extrusion.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] The present invention provides a peristaltic pump for experimental testing, comprising:

[0008] A pump housing;

[0009] A hose is fixedly installed on the inner wall of the pump housing. The hose is provided with a water inlet and a water outlet.

[0010] A driving assembly. A chute is formed in the pump housing. A displacement block is slidably installed in the chute. A short shaft is rotatably installed in the displacement block. The upper end of the short shaft is fixedly installed with a main shaft. A plurality of extrusion assemblies are rotatably installed on the outer wall of the main shaft. The extrusion assemblies roll-press the hose.

[0011] A fixing assembly for fixing the extrusion assembly on the outer wall of the main shaft.

[0012] A moving assembly for driving a plurality of driving assemblies to move linearly. The moving assembly includes a mounting seat arranged on one side of the main shaft. The mounting seat is used for loading spare extrusion assemblies.

[0013] Preferably, a first rotary driving member is fixedly installed on the lower end surface of the displacement block. The output end of the first rotary driving member penetrates through the displacement block and is fixedly connected with the short shaft. An annular groove is formed in the outer wall of the main shaft. Annular clamping grooves are formed in the upper and lower inner walls of the annular groove. A plurality of first springs are fixedly installed in the annular clamping grooves in a circumferential array. The upper and lower sides of the plurality of first springs are symmetrically and jointly fixedly installed with a clamping ring, and the clamping ring is slidably connected with the annular groove.

[0014] The extrusion assembly includes a second chuck rotatably installed on the inner wall of the annular groove. Grooves are formed in the upper and lower ends of the second chuck. A joint is fixedly installed at one end of the second chuck away from the axis of the main shaft. An extrusion roller is rotatably installed inside the joint. Second electromagnets are symmetrically installed at the upper positions on both sides of the joint. Second electromagnets with magnetic repulsion cooperation are respectively fixed on the opposite sides of adjacent two joints. The second electromagnets are electrically connected with a controller.

[0015] Preferably, first electromagnets are symmetrically and fixedly installed on both sides of the displacement block. The first electromagnets are electrically connected with a controller. Two sliding rods are symmetrically installed on the inner wall of the chute. The sliding rods are slidably connected with the first electromagnets. A second spring is fixedly installed between the displacement block and the chute.

[0016] Preferably, a fixed box is in contact connection with the upper end of the main shaft. An elevating disc is vertically slidably mounted on the inner wall of the fixed box. An electromagnetic disc is fixedly mounted on the outer wall of the elevating disc. The electromagnetic disc is electrically connected to a controller. The electromagnetic disc is magnetically matched with a second electromagnet. A support is fixedly mounted on the upper end of the elevating disc. An inclined slot is formed in the support. An electrical connector is fixedly mounted at the inner bottom end of the inclined slot. The electrical connector is electrically connected to the electromagnetic disc and a first electromagnet. An elevating conductive rod is slidably mounted at the inner top end of the inclined slot. The elevating conductive rod is electrically connected to an external power source. The upper end of the elevating conductive rod penetrates through the support. A U-shaped frame is fixedly mounted on the upper end of the support. A third spring is fixedly mounted between the U-shaped frame and the elevating conductive rod. L-shaped supports are symmetrically and fixedly mounted on both sides of the support. A vertical sliding rod is slidably mounted at the lower end of the L-shaped support. The vertical sliding rod is fixedly connected to the pump housing.

[0017] Preferably, the moving assembly includes a vertical plate fixedly mounted on the lower end face of the pump housing. A rod body is rotatably mounted on one side of the vertical plate. A second rotary driving member is fixedly mounted on the other side of the vertical plate. The second rotary driving member is electrically connected to the controller. The output end of the second rotary driving member penetrates through the vertical plate and is fixedly connected to the rod body. First thread grooves and second thread grooves with opposite thread directions are formed on the outer wall of the rod body, and the second thread groove is close to the mounting seat. The pitch of the first thread groove is greater than the pitch of the second thread groove. A moving plate is threaded on the outer wall of the rod body at the position of the second thread groove. The upper end of the moving plate is fixedly connected to the mounting seat.

[0018] Preferably, a moving frame is slidably mounted on the outer wall of the first electromagnet. One end of the rod body penetrates through the moving frame and is threadedly connected through the first thread groove. A U-shaped displacement support is fixedly mounted on one side of the moving frame. A first chuck is integrally formed at the upper end of the U-shaped displacement support at the position corresponding to the inclined slot.

[0019] Preferably, a detection assembly is further included. The detection assembly includes a mounting plate fixedly mounted on the outer wall of the hose at the water inlet. An irradiation lamp is embedded in the mounting plate. A sealing cover is fixedly mounted on the inner wall of the hose at the position corresponding to the irradiation lamp. A light source detection element is fixedly mounted in the sealing cover at the position corresponding to the irradiation lamp. The light source detection element is electrically connected to the controller.

[0020] Preferably, an external connecting pipe is connected to the outer wall of the hose at the water inlet. One end of the external connecting pipe is fixedly installed with a water inlet plate, and a water inlet hole is formed inside the water inlet plate. The other end of the external connecting pipe is fixedly installed with a water outlet plate, and a water outlet hole is formed inside the water outlet plate. The number of the water inlet holes is more than that of the water outlet holes. A flow channel plate is fixedly installed on the inner wall of the external connecting pipe at a position close to the water inlet plate, and a bent flow channel is formed inside the flow channel plate. A sealing plate is hermetically and slidably installed on one side of the external connecting pipe. Two insertion plates are symmetrically installed on one side of the sealing plate. Two clamping seats are symmetrically installed on one side of the external connecting pipe. The insertion plates are slidably connected with the clamping seats. A viscosity detection element is fixedly installed on one side of the sealing plate. The viscosity detection element is electrically connected with a controller. The detection end of the viscosity detection element penetrates through the sealing plate and extends into the external connecting pipe;

[0021] A conductive ring is fixedly installed at the inner bottom end of the pump housing. The conductive ring is electrically connected with the controller. The extrusion roller is filled with magnetorheological fluid. An electromagnetic device is fixedly installed at the inner bottom end of the extrusion roller. An elastic electric contact is fixedly connected to the lower end of the joint. The electromagnetic device is electrically connected with the elastic electric contact. The elastic electric contact is electrically connected with the conductive ring.

[0022] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art:

[0023] First, when the concentration and viscosity of the liquid increase, the spare extrusion assembly is inserted into the main shaft, and the magnetic repulsion force of the second electromagnet is used to make the distance between the newly inserted extrusion assembly and the original extrusion assembly equal, so as to keep the hose evenly extruded, make the transported liquid stable, avoid the pressure fluctuation caused by the extrusion of the hose, and increasing the number of extrusion assemblies can increase the pushing force on the liquid with higher concentration and viscosity, so that the liquid can pass through the hose more smoothly, reduce the fluctuation of the liquid during the pumping process. By adjusting the number of extrusion assemblies, the extrusion force can be adjusted according to the different concentrations and viscosities of the liquid. Higher-viscosity liquids require greater pushing force. At this time, increasing the number of extrusion assemblies can better push the liquid. Lower-viscosity liquids can appropriately reduce the number of extrusion assemblies, thereby improving efficiency and saving energy.

[0024] Second, the set conductive ring contacts with the elastic electric contact, and the conductive ring supplies power to the elastic electric contact to energize the electromagnetic device to generate a magnetic field. When the concentration and viscosity of the liquid are detected to increase, the voltage of the conductive ring is increased to enhance the magnetic force of the electromagnetic device, so as to increase the hardness of the magnetorheological fluid in the extrusion roller, enabling the extrusion roller to maintain a stable shape under a large pressure and better exert an extrusion and pushing effect on the high-viscosity sample. Increasing the hardness of the extrusion roller can more flexibly respond to the change in liquid viscosity. Especially for high-viscosity liquids, when the liquid viscosity is high, a harder extrusion roller can provide a greater extrusion force to ensure that the liquid can smoothly pass through the hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a structural schematic diagram of the driving component of the present invention;

[0028] Figure 3 is a sectional structural schematic diagram of the main shaft of the present invention;

[0029] Figure 4 is Figure 3 an enlarged structural schematic diagram at position A in

[0030] Figure 5 is a structural schematic diagram of the fixing component of the present invention;

[0031] Figure 6 is a structural schematic diagram of the bracket of the present invention;

[0032] Figure 7 is a structural schematic diagram of the moving component of the present invention;

[0033] Figure 8 is a structural schematic diagram of the detection component of the present invention;

[0034] Figure 9 is a sectional structural schematic diagram of the detection component of the present invention;

[0035] Figure 10 is Figure 9 an enlarged structural schematic diagram at position B in

[0036] Figure 11 is a structural schematic diagram of the conductive ring of the present invention.

[0037] Reference numerals: 1, pump housing; 2, hose; 3, drive assembly; 301, first rotary drive; 302, displacement block; 303, main shaft; 304, snap ring; 305, first spring; 306, annular groove; 307, first electromagnet; 308, slide bar; 309, second spring; 310, chute; 4, fixing assembly; 401, fixing box; 402, lifting disc; 403, electromagnetic disc; 404, bracket; 405, vertical rod; 406, electrical connector; 407, lifting conductive rod; 408, U-shaped frame; 409, third spring; 410, L-shaped bracket; 411, vertical slide bar; 5, moving assembly; 501, vertical plate; 502, second rotary drive; 503, rod body; 504, moving frame; 505, U-shaped displacement bracket; 506, first chuck; 507, moving plate; 508, mounting seat; 6, detection assembly; 601, mounting plate; 602, irradiation lamp; 603, sealing cover; 604, light source detection element; 605, external connecting pipe; 606, water inlet plate; 607, water outlet plate; 608, flow channel plate; 609, sealing plate; 610, card seat; 611, viscosity detection element; 612, insertion plate; 613, conductive ring; 614, elastic electrical contact; 8, extrusion assembly; 801, second chuck; 802, joint; 803, extrusion roller; 804, second electromagnet. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] The present invention will be further described below with reference to the embodiments.

[0040] Embodiment: Refer to Figures 1 to 11 , a peristaltic pump for experimental testing, comprising:

[0041] Pump housing 1;

[0042] Hose 2, fixedly installed on the inner wall of the pump housing 1. The hose 2 is made of a transparent material to facilitate the light of the irradiation lamp to effectively penetrate the hose 2. The hose 2 is provided with a water inlet and a water outlet;

[0043] The driving assembly 3, a chute 310 is provided in the pump housing 1, a displacement block 302 is slidably installed in the chute 310, a short shaft is rotatably installed in the displacement block 302, the upper end of the short shaft is fixedly installed with a main shaft 303, and a plurality of extrusion assemblies 8 are rotatably installed on the outer wall of the main shaft 303, and the extrusion assemblies 8 roll-press the hose 2;

[0044] The fixing assembly 4 is used to fix the extrusion assembly 8 on the outer wall of the main shaft 303;

[0045] The moving assembly 5 is used to drive a plurality of driving assemblies 3 to move linearly. The moving assembly 5 includes a mounting seat 508 arranged on one side of the main shaft 303, and the mounting seat 508 is used to load spare extrusion assemblies 8.

[0046] Refer to Figures 1 to 4 , a first rotary drive 301 is fixedly installed on the lower end surface of the displacement block 302, the output end of the first rotary drive 301 penetrates the displacement block 302 and is fixedly connected to the short shaft, an annular groove 306 is opened on the outer wall of the main shaft 303, annular clamping grooves are opened on the upper and lower inner walls of the annular groove 306, and a plurality of first springs 305 are fixedly installed in a circumferential array in the annular clamping grooves. The plurality of first springs 305 are symmetrically fixedly installed with a snap ring 304 up and down, and the snap ring 304 is slidably connected to the annular groove; the extrusion assembly 8 includes a second chuck 801 rotatably installed on the inner wall of the annular groove 306, grooves are opened at the upper and lower ends of the second chuck 801, a joint 802 is fixedly installed at one end of the second chuck 801 away from the axis of the main shaft 303, an extrusion roller 803 is rotatably installed inside the joint 802, second electromagnets 804 are symmetrically installed at the upper positions on both sides of the joint 802, second electromagnets 804 with magnetic repulsion cooperation are respectively fixed on the opposite sides of two adjacent joints 802, the second electromagnets 804 are electrically connected to the controller, first electromagnets 307 are symmetrically fixedly installed on both sides of the displacement block 302, the first electromagnets 307 are electrically connected to the controller, two slide rods 308 are symmetrically installed on the inner wall of the chute 310, the slide rods 308 are made of iron material, and the first electromagnets 307 slide on the outer wall of the slide rods 308, and the first electromagnets 307 generate magnetic force to adsorb on the outer wall of the slide rods 308 to prevent the driving assembly 3 from shaking. The slide rods 308 are slidably connected to the first electromagnets 307, and a second spring 309 is fixedly installed between the displacement block 302 and the chute. Through the setting of the snap ring 304, when a new extrusion assembly 8 is inserted into the annular groove 306, the extrusion assembly 8 will squeeze the snap ring 304, so that the snap ring 304 rises and falls in the annular groove 306 to fix the extrusion assembly 8. When the redundant extrusion assembly 8 is not needed, by pressing or lifting the snap ring 304 to slide in the annular groove, the redundant extrusion assembly 8 can be removed.

[0047] Refer to Figures 5 to 6, the upper end of the main shaft 303 is in contact connection with a fixed box 401. A lifting disc 402 is vertically slidably installed on the inner wall of the fixed box 401. An electromagnetic disc 403 is fixedly installed on the outer wall of the lifting disc 402. The electromagnetic disc 403 is an existing device made of an iron core, a coil and a shell. When the electromagnetic disc 403 adsorbs the second electromagnet 804, it can avoid the situation that the distance between the extrusion rollers 803 is deviated due to the shaking of the joint 802 in the annular groove 306. The electromagnetic disc 403 is electrically connected to the controller, and the electromagnetic disc 403 is magnetically matched with the second electromagnet 804. A bracket 404 is fixedly installed at the upper end of the lifting disc 402. An inclined groove is formed in the bracket 404. An electrical connector 406 is fixedly installed at the inner bottom end of the inclined groove. The electrical connector 406 is electrically connected to the electromagnetic disc 403 and the first electromagnet 307. A lifting conductive rod 407 is slidably installed at the inner top end of the inclined groove. The lifting conductive rod 407 is in limit sliding connection with the bracket 404. The lower end of the lifting conductive rod 407 is a slope, which is convenient for sliding with the slope on the upper end surface of the first chuck 506. The lifting conductive rod 407 is electrically connected to an external power source. The upper end of the lifting conductive rod 407 penetrates through the bracket 404. A U-shaped frame 408 is fixedly installed at the upper end of the bracket 404. A third spring 409 is fixedly installed between the U-shaped frame 408 and the lifting conductive rod 407. L-shaped brackets 410 are symmetrically and fixedly installed on both sides of the bracket 404. A vertical sliding rod 411 is slidably installed at the lower end of the L-shaped bracket 410. The vertical sliding rod 411 is fixedly connected to the pump housing 1.

[0048] Refer to Figure 7, the moving component 5 includes a vertical plate 501 fixedly installed on the lower end face of the pump housing 1. A rod body 503 is rotatably installed on one side of the vertical plate 501, and a second rotation driving member 502 is fixedly installed on the other side of the vertical plate 501. The second rotation driving member 502 is electrically connected to the controller. The output end of the second rotation driving member 502 penetrates the vertical plate 501 and is fixedly connected to the rod body 503. The outer wall of the rod body 503 is provided with a first thread groove and a second thread groove with opposite thread directions, and the second thread groove is arranged close to the mounting seat 508. The pitch of the first thread groove is greater than the pitch of the second thread groove. When the rod body 503 rotates, the moving plate 507 and the moving frame 504 will be driven to move respectively through the first thread groove and the second thread groove. The first thread groove with a larger thread pitch will drive the moving plate 507 to move at a relatively faster speed, and the second thread groove with a smaller thread pitch will drive the moving frame 504 to move in the direction of the moving plate 507 at a slower speed. The moving plate 507 is threaded on the outer wall of the rod body 503 at the position of the second thread groove. The upper end of the moving plate 507 is fixedly connected to the mounting seat 508. The moving frame 504 is slidably installed on the outer wall of the first electromagnet 307. One end of the rod body 503 penetrates the moving frame 504 and is threadedly connected through the first thread groove. A U-shaped displacement bracket 505 is fixedly installed on one side of the moving frame 504. A first chuck 506 is integrally formed at the upper end of the U-shaped displacement bracket 505 at the position corresponding to the inclined groove. The first rotation driving member 301 and the second rotation driving member 502 can be used with existing rotary motors.

[0049] Refer to Figures 8 to 11, further comprising a detection component 6, the detection component 6 includes a mounting plate 601 fixedly installed on the outer wall of the hose 2 at the water inlet, the mounting plate 601 is embedded with an irradiation lamp 602, a sealing cover 603 is fixedly installed on the inner wall of the hose 2 at a position corresponding to the irradiation lamp 602, a light source detection element 604 is fixedly installed in the sealing cover 603 at a position corresponding to the irradiation lamp 602, the light source detection element 604 is an existing photoresistor, and the photoresistor is an element whose resistance changes with the light intensity. Its resistance value decreases when the light intensity is strong, and conversely, the resistance increases when the light is weak. The light source detection element 604 is electrically connected to the controller. The outer wall of the hose 2 is communicated with an external connecting pipe 605 at the water inlet. One end of the external connecting pipe 605 is fixedly installed with a water inlet plate 606, and a water inlet hole is opened inside the water inlet plate 606. The other end of the external connecting pipe 605 is fixedly installed with a water outlet plate 607, and a water outlet hole is opened inside the water outlet plate 607. The number of water inlet holes is more than the number of water outlet holes. A flow channel plate 608 is fixedly installed on the inner wall of the external connecting pipe 605 near the water inlet plate 606, and a bent flow channel is opened in the flow channel plate 608. A sealing plate 609 is hermetically slidably installed on one side of the external connecting pipe 605. Two plug plates 612 are symmetrically installed on one side of the sealing plate 609. Two clamping seats 610 are symmetrically installed on one side of the external connecting pipe 605. The plug plate 612 is slidably connected with the clamping seat 610. A viscosity detection element 611 is fixedly installed on one side of the sealing plate 609. The viscosity detection element 611 is an existing device. This sensor evaluates the viscosity by measuring the resistance of the fluid during rotation. The viscosity detection element 611 is electrically connected to the controller. The detection end of the viscosity detection element 611 penetrates through the sealing plate 609 and extends into the external connecting pipe 605; a conductive ring 613 is fixedly installed at the inner bottom end of the pump housing 1, and the conductive ring 613 is electrically connected to the controller. The extrusion roller 803 is filled with magnetorheological fluid. An electromagnetic device is fixedly installed at the inner bottom end of the extrusion roller 803. The lower end of the joint 802 is fixedly connected with an elastic electric contact 614. The electromagnetic device is electrically connected to the elastic electric contact 614, and the elastic electric contact 614 is electrically connected to the conductive ring 613. The extrusion roller 803 is made of rubber material. When the magnetorheological fluid presents as a Bingham fluid with high viscosity and low fluidity under the magnetic field of the electromagnetic device, the hardness of the extrusion roller 803 can be increased, which helps to reduce the deformation of the extrusion roller 803, and the hardness of the magnetorheological fluid is proportional to the change in the concentration of the liquid.

[0050] The working principle of the present invention is as follows:

[0051] By turning on the first rotary drive member 301 to drive the short shaft to rotate, thereby driving the main shaft 303 to rotate. The rotating main shaft 303 will drive the extrusion roller 803 to alternately squeeze the hose 2. When the extrusion roller 803 presses the hose 2, the liquid in the hose 2 is pushed forward. As the extrusion roller 803 rotates continuously, the fluid in the hose 2 is gradually extruded and flows out from the water outlet;

[0052] 1. Detecting liquid concentration and viscosity: The light irradiated by the irradiation lamp 602 on the outer wall of the hose 2 will penetrate the liquid flowing in the hose 2 and be received by the light source detection element 604. According to the Lambert-Beer law, when a beam of parallel monochromatic light passes through a homogeneous liquid, the degree of light absorption by the liquid is proportional to the concentration of the light-absorbing substance in the liquid. By detecting the absorbance of the liquid to light of a specific wavelength with the light source detection element 604, the concentration of the substance in the sample is calculated to detect the concentration of the liquid flowing in the hose 2. It should be noted that the light source detection element 604 needs to be calibrated. When the light penetrates the hose 2, the hose 2 will block part of the light source;

[0053] When the liquid is being pumped, part of the liquid will enter the outer connecting pipe 605 through the water inlet hole, pass through the curved flow channel, and then be discharged from the water outlet hole and flow back into the hose 2. The number of water inlet holes is greater than that of the water outlet holes. During the flow of the liquid, the liquid cannot be discharged from the outer connecting pipe 605 in time, and a differential pressure will be formed in the outer connecting pipe 605 (during the flow of the liquid, as the liquid flows in, the amount of liquid in the outer connecting pipe 605 increases. If the discharge speed of the liquid cannot keep up with the inflow speed of the liquid, a pressure difference will be formed between the water inlet hole and the water outlet hole, and the pressure difference will slow down the liquid flow rate), resulting in slow liquid flow. In addition, the curved flow channel will increase the frictional force of the liquid flowing in the flow channel, slowing down the flow speed of the liquid in the outer connecting pipe 605, so as to increase the detection accuracy of the viscosity detection element 611. The viscosity detection element 611 will detect the viscosity of the liquid in the outer connecting pipe 605, and the liquid flowing through the outer connecting pipe 605 will re-enter the hose 2;

[0054] 2. Adjust the number of extrusion rollers 803: When the light source detection element 604 and the viscosity detection element 611 detect that the concentration and viscosity in the liquid are too high, the light source detection element 604 and the viscosity detection element 611 will generate electrical signals according to the liquid concentration and viscosity. The controller controls the voltage supplied to the second rotary drive 502 according to the electrical signals, so that the second rotary drive 502 drives the rod body 503 to rotate. The rotating rod body 503 will drive the moving plate 507, the mounting seat 508 and the spare extrusion assembly 8 to approach the main shaft 303. At the same time, the rotating rod body 503 will drive the moving frame 504 to move towards the position of the mounting seat 508. The moving moving frame 504 will drive the U-shaped displacement bracket 505 and the first chuck 506 to move into the inclined groove. The first chuck 506 contacts and presses the lifting conductive rod 407 to move the lifting conductive rod 407 upward to compress the third spring 409, so that the conduction between the lifting conductive rod 407, the electrical connector 406 and the first electromagnet 307 is disconnected, and the electromagnet disk 403 and the first electromagnet 307 lose magnetism. The electromagnet disk 403 will stop magnetically adsorbing with the second electromagnet 804, and the first electromagnet 307 will stop magnetically adsorbing with the slide rod 308. As the first chuck 506 is continuously driven to move and is squeezed by the inclined groove to drive the bracket 404, the vertical rod 405, the lifting disk 402 and the electromagnet disk 403 to rise. During the continuous movement of the moving frame 504, the inner wall of the moving frame 504 will contact the first electromagnet 307 to drive the first electromagnet 307 to slide in the chute and compress the second spring 309, so that the displacement block 302 and the first electromagnet 307 drive the extrusion roller 803 to disengage from the hose 2 and move towards the spare extrusion assembly 8 that is being driven to move, so that the second chuck 801 formed on the spare extrusion assembly 8 squeezes the snap ring 304. During the extrusion process, the snap ring 304 compresses the first spring 305, so that the second chuck 801 fits against the outer wall of the annular groove 306. The squeezed snap ring 304 will rise and then fall in the annular groove and snap into the groove of the second chuck 801 to fix the second chuck 801. By controlling the voltage input to the second electromagnet 804 by the controller, the voltage is disconnected to cut off the power supply of the second electromagnet 804 and then the power is turned on again. After the second electromagnet 804 reconnects the voltage to generate magnetic force, the adjacent two connectors 802 move on the outer wall of the main shaft 303 due to the magnetic repulsion force of the second electromagnet 804. Since the voltage supplied to each of the second electromagnets 804 is equal, the magnetic repulsion forces of the second electromagnets 804 act on each other, so that the adjacent two second electromagnets 804 maintain the same circumferential distance. In this way, the number of extrusion assemblies 8 can be increased so that multiple extrusion rollers 803 can extrude the hose 2. Multiple extrusion rollers 803 can form multiple extrusion points on the hose 2, disperse the pressure on the hose 2, and at the same time increase the pushing force for liquids with higher concentration and viscosity, so that the liquid can pass through the hose 2 more smoothly and reduce the fluctuations of the liquid during the pumping process. It should be noted that the existing manipulator can place the spare extrusion assembly 8 on the mounting seat 508.In this way, the number of extrusion components 8 is adjusted according to the different concentrations and viscosities of the liquid. By adjusting the number of extrusion components 8, the extrusion force can be adjusted according to the different concentrations and viscosities of the liquid. Liquids with higher viscosities require greater pushing forces. At this time, increasing the number of extrusion components can better push the liquid. For liquids with lower viscosities, the number of extrusion components can be appropriately reduced, thereby improving efficiency and saving energy;

[0055] It should be noted that after inserting the new extrusion component 8, for liquids with higher concentrations and viscosities, more set extrusion components 8 can be inserted to extrude the hose 2 and disperse the pressure on the hose 2. After adding the new extrusion component 8, by controlling the first rotary drive 301 to drive the rod body 503 to rotate in the reverse direction, the drive assembly 3 and the moving assembly 5 are restored to the original position where they extrude the hose 2. The first chuck 506 will withdraw from the inclined groove, allowing the bracket 404, the vertical rod 405, the lifting disc 402, and the electromagnet disc 403 to descend and contact the second electromagnet 804. The compressed third spring 409 will drive the lifting conductive rod 407 to contact the electrical connector 406 again to be energized, and the electromagnet disc 403 will be magnetically adsorbed to the second electromagnet 804 again, and the first electromagnet 307 will be magnetically adsorbed to the slide rod 308 (the first rotary drive 301 drives the main shaft 303 to rotate to maintain stability);

[0056] 3. Increase hardness: After inserting the new extrusion component 8, the extrusion component 8 will be driven to move back to the original position where it extrudes the hose 2. The elastic electrical contact 614 will contact the conductive ring 613 to be energized, enabling the electromagnetic device to generate a magnetic field and increasing the hardness of the magnetorheological fluid in the extrusion roller 803. When detecting an increase in the liquid concentration and viscosity, the controller can control the voltage supplied to the conductive ring 613 to increase, increasing the magnetic force of the magnetic field generated by the energized electromagnetic device and further increasing the hardness of the magnetorheological fluid in the extrusion roller 803. In this way, the extrusion roller 803 can maintain a stable shape under a large pressure and better exert an extrusion and pushing effect on high-viscosity samples;

[0057] It should be noted that magnetorheological fluid is a new type of fluid with controllable fluidity and is an active branch in the research of intelligent materials. When there is no external magnetic field, it exhibits the characteristics of a Newtonian fluid with low viscosity, and when an external magnetic field is applied, it presents as a Bingham fluid with high viscosity and low fluidity. There is a corresponding relationship between the viscosity of the liquid and the magnetic flux. The hardness change of the extrusion roller 803 is proportional to the extrusion strength, the viscosity of the magnetorheological fluid, and the magnitude of the magnetic field. Compared with replacing the hose 2 when transporting a liquid with a higher concentration (replacing the hose 2 usually involves processes such as disassembly and reinstallation, which not only increases the complexity of maintenance but also requires additional costs and time), increasing the hardness of the extrusion roller 803 to extrude the hose 2 is more applicable (increasing the hardness of the extrusion roller 803 can more flexibly respond to changes in liquid viscosity. Especially for high-viscosity liquids, when the liquid viscosity is high, a harder extrusion roller can provide a greater extrusion force to ensure that the liquid can smoothly pass through the hose).

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A peristaltic pump for experimental testing, characterized in that, Comprising: A pump housing (1); A hose (2), fixedly installed on the inner wall of the pump housing (1), and the hose (2) is provided with a water inlet and a water outlet; A driving assembly (3), a chute (310) is formed in the pump housing (1), a displacement block (302) is slidably installed in the chute (310), a short shaft is rotatably installed in the displacement block (302), a main shaft (303) is fixedly installed at the upper end of the short shaft, and a plurality of extrusion assemblies (8) are rotatably installed on the outer wall of the main shaft (303), and the extrusion assemblies (8) roll-press the hose (2); A fixing assembly (4) for fixing the extrusion assembly (8) on the outer wall of the main shaft (303); A moving assembly (5) for driving a plurality of driving assemblies (3) to move linearly. The moving assembly (5) includes a mounting seat (508) arranged on one side of the main shaft (303), and the mounting seat (508) is used for loading spare extrusion assemblies (8); A first rotary driving member (301) is fixedly installed on the lower end surface of the displacement block (302), and the output end of the first rotary driving member (301) penetrates through the displacement block (302) and is fixedly connected to the short shaft; Two first electromagnets (307) are symmetrically and fixedly installed on both sides of the displacement block (302), the first electromagnets (307) are electrically connected to a controller, two sliding rods (308) are symmetrically installed on the inner wall of the chute (310), the sliding rods (308) are slidably connected to the first electromagnets (307), and a second spring (309) is fixedly installed between the displacement block (302) and the chute; The moving assembly (5) includes a vertical plate (501) fixedly installed on the lower end surface of the pump housing (1), a rod body (503) is rotatably installed on one side of the vertical plate (501), a second rotary driving member (502) is fixedly installed on the other side of the vertical plate (501), the second rotary driving member (502) is electrically connected to the controller, the output end of the second rotary driving member (502) penetrates through the vertical plate (501) and is fixedly connected to the rod body (503), first and second threaded grooves with opposite thread directions are formed on the outer wall of the rod body (503), and the second threaded groove is arranged close to the mounting seat (508). The pitch of the first threaded groove is greater than the pitch of the second threaded groove. A moving plate (507) is threaded on the outer wall of the rod body (503) at the second threaded groove, and the upper end of the moving plate (507) is fixedly connected to the mounting seat (508); A moving frame (504) is slidably installed on the outer wall of the first electromagnet (307), one end of the rod body (503) penetrates through the moving frame (504) and is threadedly connected through the first threaded groove. A U-shaped displacement bracket (505) is fixedly installed on one side of the moving frame (504), and a first chuck (506) is integrally formed at the upper end of the U-shaped displacement bracket (505) at a position corresponding to the inclined groove.

2. The peristaltic pump for experimental testing according to claim 1, wherein An annular groove (306) is formed in the outer wall of the main shaft (303). Annular clamping grooves are formed in the upper and lower inner walls of the annular groove (306). A plurality of first springs (305) are fixedly installed in a circumferential array in the annular clamping grooves. The upper and lower sides of the plurality of first springs (305) are symmetrically and fixedly installed with a clamping ring (304), and the clamping ring (304) is slidably connected to the annular groove. The extrusion assembly (8) includes a second chuck (801) rotatably installed on the inner wall of the annular groove (306). Grooves are formed at the upper and lower ends of the second chuck (801). One end of the second chuck (801) away from the axis of the main shaft (303) is fixedly installed with a joint (802). An extrusion roller (803) is rotatably installed inside the joint (802). Second electromagnets (804) are symmetrically installed at the upper positions on both sides of the joint (802). Second electromagnets (804) with magnetic repulsion cooperation are respectively fixed on the opposite sides of adjacent two joints (802). The second electromagnets (804) are electrically connected to the controller.

3. The peristaltic pump for experimental testing according to claim 2, wherein The upper end of the main shaft (303) is in contact connection with a fixed box (401). A lifting disc (402) is vertically slidably installed on the inner wall of the fixed box (401). An electromagnetic disc (403) is fixedly installed on the outer wall of the lifting disc (402). The electromagnetic disc (403) is electrically connected to the controller. The electromagnetic disc (403) is magnetically attracted and matched with the second electromagnet (804). A bracket (404) is fixedly installed at the upper end of the lifting disc (402). An inclined groove is formed in the bracket (404). An electrical connector (406) is fixedly installed at the inner bottom end of the inclined groove. The electrical connector (406) is electrically connected to the electromagnetic disc (403) and the first electromagnet (307). A lifting conductive rod (407) is slidably installed at the inner top end of the inclined groove. The lifting conductive rod (407) is electrically connected to an external power source. The upper end of the lifting conductive rod (407) penetrates through the bracket (404). A third spring (409) is fixedly installed between the bracket (404) and the lifting conductive rod (407). L-shaped brackets (410) are symmetrically and fixedly installed on both sides of the bracket (404). A vertical sliding rod (411) is slidably installed at the lower end of the L-shaped bracket (410). The vertical sliding rod (411) is fixedly connected to the pump housing (1).

4. The peristaltic pump for experimental testing according to claim 1, characterized in that, It further includes a detection assembly (6). The detection assembly (6) includes a mounting plate (601) fixedly installed on the outer wall of the hose (2) at the water inlet. An irradiation lamp (602) is embedded in the mounting plate (601). A sealing cover (603) is fixedly installed on the inner wall of the hose (2) at the position corresponding to the irradiation lamp (602). A light source detection element (604) is fixedly installed in the sealing cover (603) at the position corresponding to the irradiation lamp (602). The light source detection element (604) is electrically connected to the controller.

5. The peristaltic pump for experimental testing according to claim 2, wherein, An external connecting pipe (605) is connected to the outer wall of the hose (2) at the water inlet. One end of the external connecting pipe (605) is fixedly installed with a water inlet plate (606). Water inlet holes are formed inside the water inlet plate (606). The other end of the external connecting pipe (605) is fixedly installed with a water outlet plate (607). Water outlet holes are formed inside the water outlet plate (607). The number of the water inlet holes is more than that of the water outlet holes. A flow channel plate (608) is fixedly installed on the inner wall of the external connecting pipe (605) at a position close to the water inlet plate (606). A bent flow-through groove is formed inside the flow channel plate (608). A sealing plate (609) is hermetically and slidably installed on one side of the external connecting pipe (605). Two plug plates (612) are symmetrically installed on one side of the sealing plate (609). Two clamping seats (610) are symmetrically installed on one side of the external connecting pipe (605). The plug plates (612) are slidably connected with the clamping seats (610). A viscosity detection element (611) is fixedly installed on one side of the sealing plate (609). The viscosity detection element (611) is electrically connected with the controller. The detection end of the viscosity detection element (611) penetrates through the sealing plate (609) and extends into the external connecting pipe (605). A conductive ring (613) is fixedly installed at the inner bottom end of the pump housing (1). The conductive ring (613) is electrically connected with the controller. The extrusion roller (803) is filled with magnetorheological fluid. An electromagnetic device is fixedly installed at the inner bottom end of the extrusion roller (803). An elastic electric contact (614) is fixedly connected to the lower end of the joint (802). The electromagnetic device is electrically connected with the elastic electric contact (614). The elastic electric contact (614) is electrically connected with the conductive ring (613).

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