Device and method for testing and screening flow speed of micro peristaltic pump

Abstract

The invention relates to the technical field of peristaltic pump detection, in particular to a device and method for testing and screening the flow speed of a micro peristaltic pump, the device comprises a testing and screening support, and a replaceable pump set tool used for installing peristaltic pump sets in batches is fixedly assembled on the upper surface of the testing and screening support. According to the device and method for testing and screening the flow speed of the micro peristaltic pump, simultaneous testing and screening of a plurality of pumps can be achieved, a certain automation function is achieved, and in a specific scene of a laboratory, the testing efficiency can be effectively improved, and errors caused by excessive manual intervention can be prevented; the replaceable pump set tool is convenient to disassemble and assemble, can be conveniently and rapidly replaced, and is simple in structure; the pipeline connection mode is fast, and the pump does not need to be disassembled to replace an over-short pipeline; by means of the designed collecting bottle support, liquid in a plurality of collecting bottles can be cleaned at a time, and operation is convenient, simple and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of peristaltic pump detection, and in particular to a device and method for flow rate testing and screening of a micro peristaltic pump. Background Art

[0002] Peristaltic pumps are devices that pump fluids by alternately squeezing and releasing the pump's elastic delivery hose. With its high fluid control accuracy, strong self-priming force, and closed system, peristaltic pumps have become an indispensable fluid delivery tool in the field of aerospace medicine. Whether in biomedical experiments, drug delivery, or fluid handling systems, it can provide stable and reliable fluid management functions in extreme environments, providing technical support for astronauts' health and research missions.

[0003] In order to ensure the accuracy, stability, and reliability of peristaltic pumps and meet the special requirements of spacecraft for equipment, peristaltic pumps are usually tested and screened for flow. Through these tests and screenings, it can be ensured that peristaltic pumps can provide consistent and stable flow in extreme environments, providing technical support for aerospace medical research, fluid processing and other tasks, reducing risks and improving mission success rates.

[0004] In the laboratory, the weighing method is often used to test and screen the flow rate of peristaltic pumps because of its simple operation and high accuracy, which is suitable for small-scale testing. However, when batch testing is required, the following problems may occur: 1. Low efficiency: The fluid needs to be collected and weighed manually, which may be simpler in a single test, but in batch testing, each pump needs to be tested separately, and the container must be emptied and re-prepared after the test, which will significantly reduce efficiency; 2. More manual intervention: It is usually necessary to manually place the fluid collection container on the weighing device and manually record the data after a certain period of time. This operation requires a lot of human resources in batch testing and is prone to operational errors; 3. Difficulty in automation: Although the weighing method can provide accurate flow rate data for a single pump, it is essentially a manual process and it is difficult to achieve efficient automation in batch testing; 4. Calibration and accuracy issues: The accuracy of the weighing method depends on the accuracy and calibration of the electronic balance, but during batch testing, repeated use of the balance may lead to calibration problems or decreased accuracy; 5. Unable to obtain real-time flow curve: The weighing method is mainly suitable for obtaining the average flow rate, rather than the flow rate change trend over time, and cannot detect flow rate instability or instantaneous fluctuations; 6. Unable to cope with different numbers of detection requirements, and cannot perform long-term testing. Summary of the invention

[0005] The technical problems to be solved by the present invention are: low efficiency; much manual intervention; great difficulty in automation; low calibration and accuracy; inability to obtain real-time flow curves; and inability to cope with different number of detection requirements.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a device for flow rate testing and screening of a micro peristaltic pump, comprising a test screening bracket, the upper surface of the test screening bracket is fixedly equipped with a replaceable pump group tooling for batch installation of peristaltic pump groups, the inside of the test screening bracket is fixedly equipped with a test liquid box, a data acquisition module and a control module, a plurality of bottom test slots for placing collection bottles are opened on the inner bottom surface of the test screening bracket, a weighing sensor module is fixedly installed on the inner bottom surface of the bottom test slot, a flip-type collection bottle bracket is arranged on the test screening bracket above the upper end opening of the bottom test slot, a manually controlled connecting and separating valve is arranged inside the flip-type collection bottle bracket, and lateral connecting holes with elastic sealing valves installed inside are opened on both side walls of the collection bottle.

[0007] The test screening bracket is provided with a liquid extraction tube for connecting the input end of the peristaltic pump group with the interior of the test liquid box and a liquid discharge tube for connecting the output end of the peristaltic pump group with the interior of the collection bottle.

[0008] The flip-type collecting bottle support comprises a flip regulating arm movably mounted on the inner bottom surface of the test screening support, a side guide frame fixed on the side wall of the upper surface of the flip regulating arm, and an electric control support rod.

[0009] A bottom receiving groove for installing a manually controlled connecting and separating valve is provided on the inner wall of the lower opening of the side guide frame, and lateral limiting through holes are provided on the inner walls on both sides of the bottom receiving groove.

[0010] The manual communication and separation valve comprises a bottom communication valve installed in a bottom receiving groove, a lateral communication cover fixed on both sides of the bottom communication valve, and a lateral adjustment bolt threadedly assembled on the lateral communication cover.

[0011] The liquid suction pipe and the liquid discharge pipe are both two-section guide pipes.

[0012] The upper surface of the test screening bracket is fixedly equipped with a plurality of pure copper terminals for supplying power to the peristaltic pump group through an external power source.

[0013] A lateral limiting blind hole which is arranged offset with the lateral communicating hole is provided on the side wall of the collecting bottle.

[0014] An electrically controlled top assembly panel is movably mounted on the front side wall of the test screening bracket.

[0015] A method for testing and screening a flow rate of a micro peristaltic pump comprises the following steps:

[0016] Step S1: Clamp and fix the peristaltic pump sample to be tested;

[0017] Step S2: calibrate the weighing sensor, place the collection bottle, and perform zeroing operation;

[0018] Step S3: Determine the liquid to be tested, connect the inlet and outlet liquid pipelines, turn on the switch, start the peristaltic pump through the host computer, and conduct a preliminary test. After the entire pipeline is filled with liquid and a little liquid drips into the collection bottle, turn off the peristaltic pump, and the host computer will automatically record the data at this time;

[0019] Step S4: setting the test time of the peristaltic pump on the host computer and starting batch testing of the peristaltic pump;

[0020] Step S5: By monitoring the real-time changes in the weight of the liquid in the liquid collection container, the flow rate of the peristaltic pump is calculated. The data acquisition module will automatically collect the weight data output by the weighing sensor and transmit it to the host computer for calculation according to the following formula:

[0021] Q = ΔW / Δt = (W(t 2 )-W(t 1 )) / (t 2 -t 1 )

[0022] Where: Q is the mass flow rate, usually in kg / s, ΔW is the weight change measured per unit time, in kg, and Δt is the time interval, in seconds. W(t 2 ) and W(t 1 ) are respectively at time t 2 and t 1 The weight measured at 2 -t 1 is the time interval.

[0023] Step S6: The mass flow rate is converted into the volume flow rate, which can be converted according to the density ρ of the fluid. The calculation formula is as follows:

[0024] Qvolume=Qmass / ρ

[0025] Where: Qmass is the mass flow rate in kg / s, Qvolume is the volume flow rate in L / min, and ρ is the density of the liquid in kg / L.

[0026] Step S7: According to the test requirements, the host computer selects an appropriate calculation method to process the obtained weight data. For example, two data before the test after the second zero calibration and after the test is stopped can be selected to calculate the flow rate, or the weight change per unit time can be calculated and presented in real time on the host computer in the form of a flow rate curve to monitor the flow rate change of the peristaltic pump.

[0027] Step S8: After the test is completed, clean up the liquid in the collection bottle, re-place the collection bottle and calibrate again, repeat steps S4-S7, a total of n times, and average the obtained n groups of data to determine whether the flow rate of the peristaltic pump meets the specified range. If it does, it means that the pump is qualified, if not, it means that the pump is unqualified. The calculation formula is as follows:

[0028]

[0029] Where Q st is the specified peristaltic pump flow rate, usually in kg / s or L / min, and C is the acceptable interval value, in %. is the average flow velocity after n measurements, where n is the number of measurements.

[0030] Step S9: After completing all screening tests on the same pump group, replace the replaceable pump group tooling and perform a new test.

[0031] The beneficial effects of the present invention are:

[0032] (1) The device and method for testing and screening the flow rate of a micro peristaltic pump of the present invention can realize the testing and screening of multiple pumps at the same time, and has a certain automation function. In a specific scenario of the laboratory, it can effectively improve the testing efficiency and prevent excessive manual intervention, thereby generating errors;

[0033] (2) The replaceable pump assembly tooling of the present invention is easy to disassemble and assemble, can be quickly replaced, and has a simple structure;

[0034] (3) The pipeline connection method of the present invention is quick and easy, and there is no need to dismantle the pump to replace a short pipeline;

[0035] (4) The present invention can clean the liquids of multiple collection bottles at one time through the designed collection bottle holder, which is convenient, simple and efficient to operate;

[0036] (5) The weighing sensor of the present invention has a built-in automatic calibration function, which can automatically calibrate at preset time intervals or under specific conditions, and can effectively avoid calibration problems or accuracy degradation caused by batch testing and long-term use;

[0037] (6) The present invention can obtain the average flow rate per unit time and the change trend of the flow rate over time in real time through the control module and the data acquisition module, so as to judge whether the flow rate of the peristaltic pump meets the requirements and whether the peristaltic pump has problems such as instability or instantaneous fluctuations;

[0038] (7) By adopting an electronically controlled structural design, the collection bottles can be connected in series as needed, thereby meeting the long-term testing requirements of the peristaltic pump and improving operability and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0040] Figure 1 It is a structural schematic diagram of the front side of the present invention.

[0041] Figure 2 It is a structural schematic diagram of the rear side of the present invention.

[0042] Figure 3 It is a rear view of the present invention.

[0043] Figure 4 It is a schematic diagram of the internal structure of the manual communication separation valve in the present invention.

[0044] Figure 5 It is a flow rate curve diagram of the peristaltic pump test in the present invention.

[0045] Figure 6 It is a structural schematic diagram of batch detection in the present invention. DETAILED DESCRIPTION

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Figure 1 , Figure 2 , Figure 3 and Figure 4A device for testing and screening the flow rate of a micro peristaltic pump is shown, and the device includes: a test screening bracket 1, which is used to support and fix the remaining components. A replaceable pump group tooling 3 is fixed above the test screening bracket 1, and is used to install the peristaltic pump group 2 in batches. The collecting bottle 7 is placed in the test slot 8 at the bottom of the front end of the test screening bracket 1, and is used to collect the liquid obtained by the peristaltic pump group 2 per unit time. The collecting bottle 7 is fixed by the flip-type collecting bottle bracket 10, so that it is easy to take out and clean the liquid in the collecting bottle at one time. The weighing sensor module 9 is located below the front end slot of the test screening bracket 1, and is used to measure the weight change of the liquid in the collecting bottle in real time. And the weighing sensor module 9 has a built-in automatic calibration function, which can be automatically calibrated by the control module at a preset time interval or under specific conditions. The test liquid box 4 is placed at the left rear end of the test screening bracket 1 to provide test liquid. The switch is located on the right side of the test screening bracket 1 to control the power on and off. The data acquisition module 5 and the control module 6 are located at the rear of the bracket, and are used to control the test time of the peristaltic pump group 2, and read the weight data output by the weighing sensor module 9 in real time, and collect data once at a fixed time interval (for example, every second). The pure copper terminal 16 is arranged above the right rear end of the test screening bracket 1 and is evenly distributed. It is used to connect the positive and negative poles of the peristaltic pump and supply power to it. The pipe connector is connected to both ends of the hose, the water outlet pipe is fixed to the pipe slot above the front end of the test screening bracket, and the water inlet pipe is placed in the test liquid box. When testing, the pipe connector at one end is connected to the pipe provided by the peristaltic pump.

[0049] A bottom receiving groove 15 for installing the manual communication separation valve 11 is provided on the inner wall of the lower opening of the side guide frame 102 , and lateral limiting through holes are provided on the inner walls on both sides of the bottom receiving groove 15 .

[0050] The manual communication and separation valve 11 comprises a bottom communication valve 111 installed in the bottom receiving groove 15 , a lateral communication cover 112 fixed on both sides of the bottom communication valve 111 , and a lateral adjustment bolt 113 threadedly assembled on the lateral communication cover 112 .

[0051] The manual connecting and separating valve 11 is set inside the bottom receiving groove 15 when idle, and is inserted into the lateral limiting through-hole by the lateral adjusting bolts 113 on both sides so as to be limitedly installed inside the bottom receiving groove 15. When the peristaltic pump group 2 needs to be tested for a long time, a single collecting bottle 7 cannot meet the liquid capacity. At this time, it is only necessary to pre-control the lateral adjusting bolts 113 from the lateral limiting through-hole through the external bolt batch to separate them, and then insert them into the lateral connecting holes on the two side walls of the collecting bottle 7. An internal thread locking hole matching the lateral adjusting bolts 113 is provided on the outside of the lateral connecting hole. The lateral adjusting bolts 113 are inserted into the internal thread locking hole to fix the lateral connecting cover 112 on the outer side of the collecting bottle 7, and then the elastic sealing valve 12 is squeezed inward, so that the collecting bottle 7 will be connected with the bottom connecting valve 111. When setting, the collecting bottles 7 on both sides can be fixedly connected, and at the same time, the manual connecting and separating valve 11 will be separated from the flip-type collecting bottle bracket 10 without affecting the weight test.

[0052] The lateral adjustment bolt 113 is a hollow structure liquid guide channel.

[0053] The lateral connecting covers 112 on both sides of the bottom connecting valve 111 are staggered, so that adjacent collecting bottles 7 can be conveniently fixedly connected, and multiple collecting bottles can be synchronously fixedly connected.

[0054] When idle, the elastic sealing valve 12 elastically squeezes outward to close the lateral communication hole to prevent the test liquid in the collecting bottle 7 from leaking out.

[0055] like Figure 6 As shown, when batch detection is adopted, the collecting bottle 7 is plugged into a batch frame, and then the locking bolts on the batch frame are screwed into the lateral limiting blind holes on the side walls of the collecting bottle 7, so that the weight changes of all the collecting bottles 7 can be measured synchronously.

[0056] Example 1:

[0057] Take the micro peristaltic pump RP-Q1.5 S-P45 Z-DC3V of Takasago Electric as an example, and use the above-mentioned flow rate measurement and screening device to test the flow rate of the peristaltic pump. The method is as follows:

[0058] Step S1: Select a suitable replaceable pump assembly tool 3 according to the peristaltic pump assembly 2 to be screened, and fix the replaceable pump assembly tool 3 on the test screening bracket 1 by screws, and finally clamp and fix the peristaltic pump sample to be tested;

[0059] Step S2: Turn on the power supply, which is a calibrated programmable DC power supply of model IT6333A. After calibrating the weighing sensor module 9, insert the collecting bottle 7 into the flip collecting bottle holder 10 in turn, and place it in the front card slot of the test screening holder 1, and then perform the zeroing operation;

[0060] Step S3: Determine that the tested liquid is distilled water, fill the test liquid box 4 with distilled water, connect the pipe joints of the inlet and outlet liquid pipes to the inlet and outlet pipes of the peristaltic pump group 2, the inner and outer diameters of the pipes are 1.5 mmX 2.5 mm, and the material is silicone.

[0061] Step S4: Connect the positive and negative wires of the peristaltic pump group 2 to the pure copper terminal 16, and tighten the pure copper terminal 16 by hand to prevent the line from loosening.

[0062] Step S5: After setting the rated voltage of the peristaltic pump to 3V through the software program of the host computer, start the peristaltic pump with a speed of 0.01 and perform a preliminary test. When the entire hose 3 is filled with liquid and a little liquid drips into the collection bottle, the control module 6 will automatically turn off the peristaltic pump group 2 after the weight of the weighing sensor module 9 changes, and the host computer will automatically record the data at this time.

[0063] Step S6: Start the formal test, set the test time of the peristaltic pump to 5 minutes on the host computer, start batch testing of the peristaltic pump, and the control module automatically stops the operation of the peristaltic pump group 2 after 5 minutes.

[0064] Step S7: The data acquisition module 5 automatically collects the weight data output by the weighing sensor module 9 and transmits it to the host computer. By monitoring the real-time change of the weight of the liquid in the collection bottle 7, the mass flow rate of the peristaltic pump can be calculated according to Formula 1:

[0065]

[0066] Where: Q is the mass flow rate, usually in kg / s or kg / min, ΔW is the weight change measured per unit time, in kg, and Δt is the time interval, in s or min. W(t 2 ) and W(t 1 ) are respectively at time t 2 and t 1 The weight measured at 2 -t 1 is the time interval.

[0067] If the volume flow rate is required, it can be converted according to the density ρ of the fluid. The calculation formula is as follows:

[0068]

[0069] Where: Qmass is the mass flow rate in kg / s or kg / min, Qvolume is the volume flow rate in L / min, and ρ is the density of the liquid in kg / L.

[0070] In this example 1, according to the real-time data collected and recorded by the weighing sensor module 9, after the detection step S5 is performed, the weight before the pump is 5.14g, and after the 5-minute test, the weight after the pump is 7.40g. Therefore, the flow rate of the peristaltic pump should be:

[0071]

[0072] According to formula 2, the volume flow rate is converted to distilled water with a density of 1 kg / L. The volume flow rate should be:

[0073]

[0074] Step S8: After the test is completed, all the collection bottles 7 are taken out through the collection bottle holder 5, the liquid in the collection bottles 7 is cleaned, and the collection bottles 7 are replaced and zeroed again. The steps S6-S7 are repeated for a total of n times. After the n groups of data are averaged, it is determined whether the flow rate of the peristaltic pump meets the specified range. If it meets, it means that the pump is qualified. If it does not meet, it means that the pump is unqualified. The calculation formula is as follows:

[0075]

[0076] Where Q st is the specified peristaltic pump flow rate, usually in L / min, and C is the acceptable interval value, in %. is the average flow velocity after n measurements, where n is the number of measurements.

[0077] In this example 1, the test needs to be repeated 5 times. After the average value is calculated, it is determined whether the flow rate of the peristaltic pump group 2 meets the specified requirements. The specified peristaltic pump flow rate is 0.45ml / min, and the qualified range is ±10%. After measuring 5 times, the average flow rate of the peristaltic pump should be:

[0078]

[0079] The test results meet the requirements, indicating that the pump is qualified.

[0080] Step S9: After completing all screening tests of the same pump group, the pump group tooling 2 can be replaced to conduct a new round of testing.

[0081] Example 2 (Comparative Example 1)

[0082] The test method of comparative example 1 measures the peristaltic pump group 2, and can obtain the average flow rate, rather than the flow rate change trend over time, and cannot detect flow rate instability or instantaneous fluctuation problems.

[0083] Example 2 is based on Example 1. The flow rate of the peristaltic pump group 2 can be detected in real time per unit time through the weighing sensor module 9, the data acquisition module 5, and the control module 6, and the flow rate curve can be displayed in real time on the host computer to monitor the flow rate change of the peristaltic pump.

[0084] Here’s how:

[0085] Steps S1-S7 are the same as those in Example 1.

[0086] In this Example 2, according to the real-time continuous data collection and recording of the weighing sensor module 9, after the detection step S5 is performed, a 5-minute test is completed, and the flow rate data at multiple time points are recorded. The recording time interval is 30 seconds. According to Formula 1 and Formula 2, a set of corresponding relationships between time, liquid mass and flow rate is calculated. The actual test results (retain two decimal places) are:

[0087] Time(s) Liquid mass (g) Flow rate (ml / min) 0 0.490 - 30 0.720 0.46 60 0.945 0.45 90 1.170 0.45 120 1.390 0.44 150 1.615 0.45 180 1.845 0.46 210 2.080 0.47 240 2.310 0.46 270 2.535 0.45 300 2.760 0.45

[0088] Step S8: Using the measured data on the host computer, a line graph of time and flow rate can be automatically drawn. The quadratic polynomial curve fitting can be used to analyze and determine whether the flow rate of the tested peristaltic pump group 2 is stable as a whole and whether there is fluctuation. The general formula for quadratic polynomial fitting is: y = ax2 + bx + c. If the curve is drawn as Figure 5 shown.

[0089] In this embodiment 2, according to the quadratic polynomial fitting result of the flow rate data and time, the fitting equation is:

[0090] Q(t)=-8e-08x 2 +4e-05x+0.4503

[0091] The fitted curve shows the trend of flow rate changing with time. The coefficient of the quadratic term is small, indicating that the curve is basically close to flat, and the flow rate fluctuates to a certain extent at different time points. Overall, the flow rate of this pump is relatively stable, and the flow rate is in line with the range specified by peristaltic pump group 2, so this pump is qualified.

[0092] In addition, for the flow rate data, a is negative, indicating that the flow rate has a tendency to rise to a peak value in a certain period of time and then begin to decline. This trend may indicate that there is an "optimal" time point for the flow rate of the system, at which the flow rate is the highest, and the flow rate is lower at other times.

[0093] Step S9: After the test is completed, all the collecting bottles 7 are taken out through the flip collecting bottle holder 10, the liquid in the collecting bottles 7 is cleaned, and the collecting bottles 7 are replaced and zeroed again, or the pump assembly tooling 2 can be replaced to carry out a new round of testing.

[0094] The test screening device provided by the present invention can realize the simultaneous test screening of multiple pumps and has certain automation functions. In a specific scenario of the laboratory, it can effectively improve the test efficiency and prevent excessive manual intervention, thereby generating errors. Through the control module 6 and the data acquisition module 5, the average flow rate per unit time can be obtained, and the change trend of the flow rate over time can be obtained in real time, so as to judge whether the flow rate of the peristaltic pump group 2 meets the requirements, and judge whether the peristaltic pump group 2 has problems such as instability or instantaneous fluctuations.

[0095] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A device for testing and screening flow rate of a micro peristaltic pump, comprising a testing and screening bracket (1), characterized in that: The upper surface of the test screening bracket (1) is fixedly equipped with a replaceable pump group tooling (3) for batch installation of peristaltic pump groups (2); the inside of the test screening bracket (1) is fixedly equipped with a test liquid box (4), a data acquisition module (5) and a control module (6); the inner bottom surface of the test screening bracket (1) is provided with a plurality of bottom test slots (8) for placing collection bottles (7); the inner bottom surface of the bottom test slot (8) is fixedly equipped with a weighing sensor module (9); the test screening bracket (1) is provided with a flip-type collection bottle bracket (10) above the upper end opening of the bottom test slot (8); the flip-type collection bottle bracket (10) is provided with a manually controlled connecting and separating valve (11); and the two side walls of the collection bottle (7) are provided with lateral connecting holes with elastic sealing valves (12) installed inside.

2. The device for testing and screening flow rate of a micro peristaltic pump according to claim 1 is characterized in that: The test screening bracket (1) is provided with a liquid extraction tube (13) for connecting the input end of the peristaltic pump group (2) with the interior of the test liquid box (4) and a liquid discharge tube (14) for connecting the output end of the peristaltic pump group (2) with the interior of the collection bottle (7).

3. The device for testing and screening the flow rate of a micro peristaltic pump according to claim 1 is characterized in that: The flip-type collecting bottle support (10) comprises a flip adjustment arm (101) movably mounted on the inner bottom surface of the test screening support (1), a side guide frame (102) fixed on the side wall of the upper surface of the flip adjustment arm (101), and an electric control support rod (103).

4. The device for testing and screening flow rate of a micro peristaltic pump according to claim 3 is characterized in that: A bottom receiving groove (15) for installing a manually controlled connecting and separating valve (11) is provided on the inner wall of the lower opening of the side guide frame (102), and lateral limiting through holes are provided on the inner walls on both sides of the bottom receiving groove (15).

5. The device for testing and screening the flow rate of a micro peristaltic pump according to claim 4 is characterized in that: The manually controlled connecting and separating valve (11) comprises a bottom connecting valve (111) installed in a bottom receiving groove (15), a lateral connecting cover (112) fixed on both sides of the bottom connecting valve (111), and a lateral adjusting bolt (113) threadedly assembled on the lateral connecting cover (112).

6. The device for testing and screening flow rate of a micro peristaltic pump according to claim 2, characterized in that: The liquid suction pipe (13) and the liquid discharge pipe (14) are both two-section flow guide pipes.

7. The device for testing and screening flow rate of a micro peristaltic pump according to claim 1, characterized in that: The upper surface of the test screening bracket (1) is fixedly equipped with a plurality of pure copper terminals (16) for supplying power to the peristaltic pump group (2) with an external power source.

8. The device for testing and screening flow rate of a micro peristaltic pump according to claim 5, characterized in that: The side wall of the collecting bottle (7) is provided with a lateral limiting blind hole which is arranged in a staggered arrangement with the lateral communicating hole.

9. The device for testing and screening flow rate of a micro peristaltic pump according to claim 3, characterized in that: An electrically controlled top mounting panel (18) is movably mounted on the front side wall of the test screening bracket (1).

10. A method for testing and screening flow rates of micro peristaltic pumps, comprising the following steps: Step S1: Clamping and fixing the peristaltic pump group (2) sample to be tested; Step S2: calibrate the weighing sensor module (9), place the collecting bottle (7), and perform a zero calibration operation; Step S3: Determine the liquid to be tested, connect the inlet and outlet liquid pipelines, turn on the switch, start the peristaltic pump group (2) through the host computer, and conduct a preliminary test. After the entire pipeline is filled with liquid and a small amount of liquid drips into the collection bottle (7), turn off the peristaltic pump group (2), and the host computer will automatically record the data at this time; Step S4: setting the test time of the peristaltic pump group (2) on the host computer and starting batch testing of the peristaltic pump group (2); Step S5: By monitoring the real-time change of the weight of the liquid in the liquid collection container, the flow rate of the peristaltic pump group (2) is calculated. The data acquisition module (5) automatically collects the weight data output by the weighing sensor module (9) and transmits it to the host computer for calculation according to the following formula: Q=ΔW / Δt=(W(t2)-W(t1)) / (t2-t1) Where: Q is the mass flow rate, usually in kg / s, ΔW is the weight change measured per unit time, in kg, and Δt is the time interval, in seconds. W(t2) and W(t1) are the weights measured at time t2 and t1, respectively, and t2-t1 is the time interval. Step S6: The mass flow rate is converted into the volume flow rate, which can be converted according to the density ρ of the fluid. The calculation formula is as follows: Qvolume=Qmass / ρ Where: Qmass is the mass flow rate in kg / s, Qvolume is the volume flow rate in L / min, and ρ is the density of the liquid in kg / L. Step S7: According to the test requirements, the host computer selects a suitable calculation method to process the obtained weight data. For example, two data before the test after the second zero calibration and after the test is stopped can be selected to calculate the flow rate, or the weight change per unit time can be calculated and presented in real time on the host computer in the form of a flow rate curve to monitor the flow rate change of the peristaltic pump group (2). Step S8: After the test is completed, the liquid in the collection bottle is cleaned up, the collection bottle (7) is re-placed and zeroed again, and steps S4-S7 are repeated for a total of n times. After the obtained n groups of data are averaged, it is determined whether the flow rate of the peristaltic pump group (2) meets the specified range. If it meets the range, it means that the pump is qualified. If it does not meet the range, it means that the pump is unqualified. The calculation formula is as follows: Where Q st is the specified flow rate of the peristaltic pump group (2), usually in kg / s or L / min, and C is the acceptable interval value, in %. is the average flow velocity after n measurements, where n is the number of measurements. Step S9: After completing all screening tests on the same pump group, replace the replaceable pump group tooling (3) and perform a new test.

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