Syringe pump function testing apparatus

Abstract

The utility model provides a kind of syringe pump function test equipment, including pedestal, be located on pedestal and be used for clamping syringe pump's clamping unit, be used for fixed to the push rod of syringe pump's floating detection plate, be located on pedestal and be used for detecting the position detection unit of floating detection plate's location, and for the pressure simulation unit for applying back pressure to syringe pump.The pedestal of the utility model can provide long-term stable and anti-interference physical reference for test, fundamentally guarantees the accuracy of measurement reference.Clamping unit can stabilize the position of syringe pump in test process, eliminates the error caused by syringe pump movement.The combination of floating detection plate and high-sensitivity position detection unit realizes indirect, non-destructive and high-precision real-time tracking measurement of push rod displacement.Pressure simulation unit can simulate the dynamic load working condition of real back pressure during test, so as to comprehensively evaluate the accuracy and precision of syringe pump in actual work.

Description

Technical Field

[0001] This utility model belongs to the field of pump testing technology, specifically relating to a syringe pump function testing device. Background Technology

[0002] Laboratory syringe pump functional testing equipment is a key device used in fields such as biochemical analysis and drug delivery to achieve high-precision quantitative liquid delivery. Its working principle involves a stepper motor driving a lead screw and nut mechanism, which linearly pushes the syringe plunger to control the intake and discharge of liquid.

[0003] The core performance indicators of a syringe pump are the accuracy and precision of the plunger displacement. Performance testing before shipment is a crucial step in ensuring product quality. Currently, the mainstream testing methods for syringe pumps include manual testing and semi-automatic testing, but both methods have significant drawbacks.

[0004] Manual testing is the most primitive method. Operators manually control the syringe pump, using dial indicators, calipers, and other mechanical measuring tools to manually read the displacement data of the push rod. This data is then recorded and calculated or input into a computer for simple analysis. The main drawbacks of this method are: first, manual reading introduces unavoidable subjective and visual fatigue errors, resulting in poor reliability and repeatability of the test results; second, testing efficiency is extremely low, heavily reliant on skilled workers, and cannot meet the needs of modern mass production; finally, the testing process has a low degree of standardization, making it difficult to generate unified and standardized test reports, which is detrimental to quality traceability.

[0005] Semi-automatic testing methods offer improvements, such as using displacement sensors to replace human eye readings. However, significant manual intervention is still required for test process control and data analysis. For instance, during testing, operators may need to manually click software buttons to move the syringe pump to different positions or manually record sensor data. While this method reduces reading errors, it does not achieve full automation, resulting in limited efficiency improvements and failing to effectively simulate real-world operating conditions. Semi-automatic testing methods typically only allow testing in static environments without load (no back pressure), whereas syringe pumps inevitably face fluid resistance (back pressure) during actual operation. The lack of load testing capability prevents a comprehensive and accurate evaluation of the syringe pump's dynamic performance.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a syringe pump function testing device, which solves the problem of inaccurate test results in existing syringe pumps.

[0008] To achieve the above objectives, a specific embodiment of this utility model provides an injection pump function testing device. The injection pump function testing device includes a base, a clamping unit disposed on the base for clamping the injection pump, a floating detection plate for fixing to the push rod of the injection pump, a position detection unit disposed on the base for detecting the position of the floating detection plate, and a pressure simulation unit for applying back pressure to the injection pump.

[0009] In one or more embodiments of this utility model, the clamping unit is configured as a manual quick-press clamp.

[0010] In one or more embodiments of this utility model, the position detection unit is used to detect the height of the floating detection plate.

[0011] In one or more embodiments of this utility model, the position detection unit includes an electronic height gauge for detecting the height of the floating detection plate and a bracket for supporting and fixing the electronic height gauge.

[0012] In one or more embodiments of this utility model, the probe of the electronic height gauge is perpendicular to the floating detection plate.

[0013] In one or more embodiments of this utility model, the pressure simulation unit includes a pressure controller and a fluid pipeline. The fluid pipeline is used to connect to the inlet and outlet of the injection pump, and the pressure controller is used to adjust the back pressure applied to the injection pump by the fluid pipeline.

[0014] In one or more embodiments of this utility model, the syringe pump function testing device further includes a control unit, which is electrically connected to the syringe pump, the position detection unit and the pressure simulation unit to control the movement stroke of the push rod, collect and process the position data of the floating detection plate, and control the application and release of back pressure.

[0015] In one or more embodiments of this utility model, the control unit is also used to generate a test report based on the test data.

[0016] In one or more embodiments of this invention, the control unit is configured within an industrial tablet PC.

[0017] In one or more embodiments of the present invention, the syringe pump function testing device further includes a positioning block disposed on the base and used for positioning the syringe pump.

[0018] Compared with existing technologies, the base of this invention provides a long-term stable and interference-resistant physical reference for testing, fundamentally ensuring the accuracy of the measurement reference. The clamping unit stabilizes the position of the syringe pump during testing, eliminating errors caused by pump movement. The combination of the floating detection plate and the high-sensitivity position detection unit enables indirect, non-destructive, and high-precision real-time tracking measurement of the push rod displacement. The pressure simulation unit simulates the dynamic load conditions of real back pressure during testing, thus comprehensively evaluating the accuracy and precision of the syringe pump in actual operation. All these components work together to improve the efficiency, reliability, and accuracy of syringe pump testing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the syringe pump function testing device in one embodiment of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of a portion of the syringe pump function testing device in one embodiment of the present invention;

[0022] Figure 3 This is a front view of a portion of the structure of the injection pump function testing device in one embodiment of the present invention;

[0023] Figure 4 This is a side view of a portion of the structure of the injection pump function testing device in one embodiment of the present invention.

[0024] Key reference numerals: 1. Base, 2. Clamping unit, 3. Floating detection plate, 4. Position detection unit, 5. Control unit, 6. Positioning block, 7. Test platform, 8. Injection pump, 81. Push rod. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0026] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In one embodiment, reference is made to Figures 1 to 4 As shown, this utility model provides a syringe pump function testing device for testing the accuracy and precision of a syringe pump 8. The device includes a base 1, a clamping unit 2, a floating detection plate 3, a position detection unit 4, and a pressure simulation unit (not shown). The base 1 stably supports the syringe pump 8. The base 1 can be made of marble, which has an extremely low coefficient of linear expansion and excellent thermal stability, effectively reducing deformation caused by environmental temperature fluctuations and maintaining the accuracy of the reference plane over a long period. The clamping unit 2 is mounted on the base 1 and applies a clamping force from the top of the syringe pump 8, firmly clamping and fixing the syringe pump 8 to the base 1. This stabilizes the position of the syringe pump 8 during testing, preventing it from moving arbitrarily and affecting the accuracy of the test results. The floating detection plate 3 is fixed to the push rod 81 of the syringe pump 8 and can move synchronously with the push rod 81 during testing. The position detection unit 4 is mounted on the base 1 and is used to detect the position of the floating detection plate 3, thereby indirectly detecting the position of the push rod 81. The pressure simulation unit is used to apply back pressure to the syringe pump 8 to simulate the real fluid resistance faced by the syringe pump 8 when discharging liquid in actual operation, making the test results more accurate.

[0029] According to the above structural design, the base 1 provides a long-term stable and interference-resistant physical reference for testing, fundamentally ensuring the accuracy of the measurement reference. The clamping unit 2 stabilizes the position of the syringe pump 8 during testing, eliminating errors caused by the movement of the syringe pump 8. The combination of the floating detection plate 3 and the high-sensitivity position detection unit 4 enables indirect, non-destructive, and high-precision real-time tracking measurement of the displacement of the push rod 81. The pressure simulation unit can simulate the dynamic load conditions of real back pressure during testing, thereby comprehensively evaluating the accuracy and precision of the syringe pump 8 in actual operation. All these components work together to improve the efficiency, reliability, and accuracy of syringe pump testing.

[0030] In one embodiment, reference is made to Figure 2 As shown, clamping unit 2 is configured as a manual quick-press clamp. The manual quick-press clamp includes a support post, a wrench, and a pressure head. The support post has a certain height, the wrench is rotatably mounted on top of the support post, and the pressure head is connected to the wrench via a linkage structure. When the tester rotates the wrench, they can freely control the pressure head to tighten or loosen from the injection pump 8 below it. This makes the structure of the manual quick-press clamp easily adaptable to the height of different models of injection pumps 8, enhancing the versatility of the testing equipment.

[0031] In one embodiment, during the test, when the injection pump 8 is placed on the base 1, the central axis of the push rod 81 is ensured to be perpendicular to the horizontal plane, and the movement direction of the push rod 81 is limited to the vertical direction, so that the displacement of the push rod 81 is directly equivalent to the height change of the floating detection plate 3. The probe of the position detection unit 4 is vertically aligned and lightly touches the upper surface of the floating detection plate 3. By acquiring the absolute height coordinates of the floating detection plate 3 in real time, the axial displacement of the push rod 81 is derived. This indirect detection strategy avoids the friction, interference, or alignment errors that may be caused by direct contact with the push rod 81.

[0032] Furthermore, the position detection unit 4 includes a high-precision electronic height gauge and a dedicated bracket. The bracket is fixedly connected to the base 1 and supports and fixes the electronic height gauge. The bracket is roughly L-shaped, with the horizontal section of the bracket positioned at the top of the vertical section. The electronic height gauge is installed at the horizontal section of the bracket, and the probe of the electronic height gauge is approximately perpendicular to the floating detection plate 3. The bracket can withstand minor vibrations that may exist in the test environment, thus providing an extremely stable measurement reference platform for the electronic height gauge. During the test preparation stage, the probe can be brought into contact with the upper surface of the floating detection plate 3 through the fine-tuning mechanism inside the electronic height gauge, allowing the probe of the electronic height gauge to always follow the floating detection plate 3 in the vertical direction and continuously output the height coordinates of the floating detection plate 3.

[0033] In one embodiment, the pressure simulation unit includes a pressure controller and a fluid pipeline. The pressure controller outputs a stable, continuous, and precisely programmable fluid pressure. The fluid pipeline is connected to the output port of the pressure controller and, through connectors and other components, to the inlet and outlet ports of the syringe pump 8, thereby establishing a closed fluid loop within the syringe cavity. During the test, when the syringe pump 8 performs the dispensing action, the pressure controller is simultaneously activated, applying a constant pressure to the fluid pipeline according to a preset pressure value. This pressure acts on the syringe piston to create back pressure, accurately simulating the back pressure faced by the syringe pump 8 during actual operation. Furthermore, the pressure controller allows adjustment of the back pressure within a certain range to simulate different operating conditions of the syringe pump 8.

[0034] In one embodiment, reference is made to Figure 1 As shown, the syringe pump functional testing equipment also includes a control unit 5, which is the core component for automated testing. The control unit 5 is integrated and runs within an industrial panel PC, using its built-in dedicated testing software to centrally manage and intelligently control all hardware. The control unit 5 is electrically connected to the control port of the syringe pump under test 8 via a serial communication interface to send precise motion commands (such as homing, segmented movement, and speed setting) and receive status feedback. The control unit 5 is also electrically connected to an electronic height gauge via another independent communication interface to achieve real-time, synchronous, and high-speed acquisition of displacement data. The control unit 5 is also electrically connected to the pressure controller of the pressure simulation unit via an additional communication bus to programmatically control the application, maintenance, and release of back pressure during the test.

[0035] During test execution, control unit 5 automatically coordinates the aforementioned units according to a preset program: first, it controls the syringe pump 8 to complete initialization and homing; then, under simulated back pressure, it drives the push rod 81 to perform precise segmented movements covering the entire stroke and multiple proportional segments. At each target position point, the software automatically triggers data acquisition, obtains a set of position samples, and performs statistical analysis in real time, calculating the coefficient of variation (CV value) used to evaluate the accuracy of syringe pump 8 and the maximum deviation rate used to evaluate the precision of syringe pump 8. Finally, control unit 5 automatically compares all test process records, raw data, calculation results, and preset pass / fail standards to generate a complete and uniformly formatted structured electronic test report. The report will clearly state the pass / fail judgment, thereby achieving full automation of the testing process and digitalization of quality management.

[0036] In one embodiment, reference is made to Figure 2 and Figure 3 As shown, the syringe pump function testing equipment also includes a positioning block 6 on the base 1. The positioning block 6 is used to position the syringe pump 8. The positioning block 6 is generally set in an L shape to form a right-angle positioning structure.

[0037] In one embodiment, reference is made to Figure 1 As shown, the syringe pump function testing equipment also includes a test platform 7, with the base 1 and control unit 5 both located on the top surface of the test platform 7.

[0038] The above describes the general structure of the syringe pump function testing equipment in this application. The actual testing steps will be further described below.

[0039] First, the injection pump 8 is placed on the base 1 and clamped and fixed by the clamping unit 2. The control unit 5 sends an initialization command to the injection pump 8 through the communication interface, and the push rod 81 performs a mechanical zero-return operation to eliminate accumulated errors and establish a reliable displacement reference zero point for the entire test process, ensuring the accuracy of all subsequent measurement results.

[0040] Next, the control unit 5 controls the syringe pump 8 to switch to the liquid aspiration state and drives the push rod 81 to move from the zero point to the end of the full stroke (e.g., 30 mm). This process simulates the operation of the syringe pump 8 aspirating liquid before actual use, so that the push rod 81 is in the test starting position, and at the same time verifies the full stroke movement capability of the syringe pump 8.

[0041] Then, the control unit 5 controls the syringe pump 8 to switch to the drainage state and simultaneously instructs the pressure controller to start, applying a preset constant back pressure (e.g., 2 Bar) to the syringe pump 8 to simulate real drainage resistance. Under this load condition, starting from the end of the full stroke, the push rod 81 is controlled to perform multi-segment displacement motion towards zero. The selection of test points is systematic and representative, aiming to comprehensively evaluate the performance under different motion amplitudes: generally, it is a fine segment of 1 / 20 of the full stroke (a total of 20 points, such as from 28.5mm to 0mm, with a step of 1.5mm), used to assess the micro-motion accuracy when pushing small doses. Alternatively, it can be a 1 / 10 full stroke segment (a total of 10 points, with a step of 3mm), a 1 / 5 full stroke segment (5 points, with a step of 6mm), a 1 / 2 full stroke segment (2 points, 15mm and 0mm), and a complete full stroke motion (from 30mm directly to 0mm), used to evaluate the consistency and cumulative error throughout the stroke.

[0042] Once the push rod 81 moves to each preset target position and stabilizes, the built-in testing software in the control unit 5 automatically triggers the electronic height gauge to collect a fixed number (e.g., 100) of displacement data samples. The testing software then immediately performs statistical analysis on this sample set, calculating the coefficient of variation (CV). The coefficient of variation = sample standard deviation / sample mean. The coefficient of variation quantifies the degree of data dispersion and evaluates the accuracy of the injection pump 8. Simultaneously, the testing software calculates the maximum deviation rate. The maximum deviation rate = (sample maximum value - sample minimum value) / target displacement value. The maximum deviation rate reflects the degree of deviation of the actual displacement range of the push rod 81 from the theoretical target, thus evaluating the accuracy of the injection pump 8. After the coefficient of variation and maximum deviation rate are calculated, they are compared with preset acceptable thresholds.

[0043] Ultimately, the testing software integrates the recorded control commands, raw sampling data from all target points, and calculated performance indicators such as CV values ​​and maximum deviation rates to generate a clearly structured and uniformly formatted electronic test report. The report explicitly lists whether each result meets the pass / fail criteria and automatically provides a comprehensive judgment conclusion (pass or fail) based on all test data, achieving objectivity and standardization in test result judgment and providing a complete data chain for quality traceability.

[0044] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A syringe pump function testing device, characterized in that, The injection pump function testing equipment includes a base (1), a clamping unit (2) disposed on the base (1) for clamping the injection pump (8), a floating detection plate (3) for fixing to the push rod (81) of the injection pump (8), a position detection unit (4) disposed on the base (1) for detecting the position of the floating detection plate (3), and a pressure simulation unit for applying back pressure to the injection pump (8).

2. The syringe pump function testing device according to claim 1, characterized in that, The clamping unit (2) is configured as a manual quick-press clamp.

3. The syringe pump function testing device according to claim 1, characterized in that, The position detection unit (4) is used to detect the height of the floating detection plate (3).

4. The syringe pump function testing device according to claim 3, characterized in that, The position detection unit (4) includes an electronic height gauge for detecting the height of the floating detection plate (3) and a bracket for supporting and fixing the electronic height gauge.

5. The syringe pump function testing device according to claim 4, characterized in that, The probe of the electronic height gauge is perpendicular to the floating detection plate (3).

6. The syringe pump function testing device according to claim 1, characterized in that, The pressure simulation unit includes a pressure controller and a fluid line. The fluid line is used to connect to the inlet and outlet of the injection pump (8). The pressure controller is used to adjust the back pressure applied to the injection pump (8) by the fluid line.

7. The syringe pump function testing device according to claim 1, characterized in that, The injection pump function testing equipment also includes a control unit (5), which is electrically connected to the injection pump (8), the position detection unit (4) and the pressure simulation unit to control the movement stroke of the push rod (81), collect and process the position data of the floating detection plate (3), and control the application and release of back pressure.

8. The syringe pump function testing device according to claim 7, characterized in that, The control unit (5) is also used to generate a test report based on the test data.

9. The syringe pump function testing device according to claim 7, characterized in that, The control unit (5) is located within an industrial tablet PC.

10. The syringe pump function testing device according to claim 1, characterized in that, The injection pump function testing equipment also includes a positioning block (6) set on the base (1) and used to position the injection pump (8).

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