Device and method for testing nozzle and firing pin of high-speed dispensing valve

Abstract

The invention provides a testing device and method for a nozzle and a firing pin of a high-speed dispensing valve, and the device achieves the high-frequency vibration of the nozzle through a piezoelectric ceramic impact module, and further controls the vibration frequency and amplitude of the fatigue impact of the nozzle and the firing pin. The size and the direction of a force value in the fatigue impact process are monitored on line in real time based on a dynamometer, and if the force value is suddenly and violently increased or decreased in the testing process, the nozzle and the firing pin start to be subjected to fatigue wear; according to the magnitude and directivity of the force value, combined with artificial intelligence deep learning big data of a computer, intelligent prediction of the fatigue performance and the wear life of the nozzle and the firing pin is realized, meanwhile, model selection optimization of different materials and structures of the nozzle and the firing pin can be carried out according to a fatigue test result and wear feature analysis, cost reduction and efficiency improvement of a product are facilitated, and the product quality is improved. And the service performance and the service life of the high-speed dispensing valve are improved.

Description

Technical Field

[0001] The present invention relates to a test device and method for a nozzle and a plunger of a high-speed dispensing valve. Background Art

[0002] High-speed dispensing machines can be used to quickly and accurately apply liquids such as glue to corresponding precise positions in the product processes of new energy, 3C electronics, semiconductors, etc. The dispensing of the high-speed dispensing machine is mainly controlled by a nozzle and a plunger; an ejection channel is provided on the nozzle, and its opening or closing is controlled by the plunger to achieve dispensing and stop dispensing. Specifically, when dispensing is required, the plunger moves away from the nozzle under the action of an external force to open the ejection channel and achieve dispensing; when the ejection channel needs to be closed, the external force is removed, and the plunger impacts the nozzle under the action of the elastic force of the elastic member to close the ejection channel and stop dispensing. Therefore, when the high-speed dispensing machine is operating, the plunger will frequently impact the nozzle, which results in disadvantages such as easy wear and low service life of the nozzle and plunger in the high-speed dispensing valve. Especially in the environment of viscous glue, the glue valve will leak and the dispensing amount will be inconsistent due to wear and fatigue failure, and the core components inside the valve need to be frequently replaced, resulting in high usage costs.

[0003] For current detection devices for plungers and nozzles, such as the invention patent with the application number 202311564643.4, which discloses a quality detection device and method for plungers and nozzles for detecting plungers and nozzles, but it can only detect some defects in the structures of the plunger and the nozzle, including the aperture size, burrs, and concentricity, etc.; it cannot detect the fatigue performance and wear life of the plunger and the nozzle, cannot simulate the actual working conditions of the high-speed dispensing valve, and cannot monitor and evaluate the fatigue performance and wear life of the nozzle and the plunger in real time online. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a test device and method for a nozzle and a plunger of a high-speed dispensing valve to solve the above problems.

[0005] The present invention adopts the following solutions:

[0006] The present application provides a test device for a nozzle and a plunger of a high-speed dispensing valve, including a base, on which a first clamping table and a second clamping table are movably arranged; a first fixture for fixing the plunger is arranged on the first clamping table; a second fixture is arranged on the second clamping table, and a piezoelectric ceramic impact module is fixedly arranged on the second fixture, and a force measuring instrument capable of fixing the nozzle is arranged at the output end of the piezoelectric ceramic impact module.

[0007] By adjusting the first clamping table and the second clamping table, the impact pin and the nozzle can be made to be on the same axis and can approach or move away from each other; the piezoelectric ceramic impact module is used to achieve high-frequency vibration of the nozzle to impact the impact pin; the force measuring instrument is used to measure the vector force information of the nozzle and feedback it to a computer for analysis and processing.

[0008] Further, the piezoelectric ceramic impact module includes a piezoelectric ceramic actuator, a controller for controlling the piezoelectric ceramic actuator, and a signal generator electrically connected to the controller.

[0009] Further, one end face of the nozzle away from the impact pin and one side plane port of the force measuring instrument are adhesively connected.

[0010] Further, a through hole for installing the impact pin is provided on the first fixture, and a limiting member is provided along the radial direction of the through hole for fixing the impact pin.

[0011] Further, the critical contact state is that the contact normal force measured by the force measuring instrument is about 0.1 - 1 N

[0012] Further, a first drive is provided on the base for driving the first fixture to move in the Y direction; a second drive and a third drive are provided on the second clamping table for driving the second fixture to move in the X direction and the Z direction respectively.

[0013] Further, a double-rail sliding platform is provided on the base, which includes two linear rails; the first clamping table is slidably arranged on the linear rails.

[0014] A testing method, using the described testing device, includes the following steps:

[0015] Fix the impact pin and the nozzle on the first fixture and the second fixture respectively;

[0016] Adjust the positions of the first fixture and the second fixture according to the position of the impact pin so that the center lines of the impact pin and the nozzle are on the same axis; and make the impact pin and the nozzle in a critical contact state;

[0017] Start the piezoelectric ceramic impact module to drive the nozzle to perform high-frequency vibration to simulate the fatigue impact process between the nozzle and the impact pin in the valve of the high-speed dispensing machine under different working conditions;

[0018] The force measuring instrument monitors the magnitude and direction of the force value in real time during the fatigue impact process and transmits the signal to a computer for processing and analysis;

[0019] Complete the test, stop the piezoelectric ceramic impact module, move the ejector pin and the nozzle away from each other, turn off the power supply, and remove the ejector pin and the nozzle.

[0020] By adopting the above technical solutions, the present invention can achieve the following technical effects:

[0021] The present invention provides a test device for a nozzle and an ejector pin of a high-speed dispensing valve, which realizes high-frequency vibration of the nozzle through a piezoelectric ceramic impact module, and then controls the vibration frequency and amplitude of the fatigue impact between the nozzle and the ejector pin; and based on a dynamometer, the magnitude and direction of the force value during the fatigue impact process are monitored in real time. If the force value suddenly rises or falls sharply during the test, it indicates that the nozzle and the ejector pin begin to experience fatigue wear; furthermore, based on the magnitude and directionality of the force value, combined with the artificial intelligence deep learning big data of the computer, the intelligent prediction of the fatigue performance and wear life of the nozzle and the ejector pin is realized. At the same time, the selection and optimization of different materials and structures of the nozzle and the ejector pin can also be carried out according to the fatigue test results and wear characteristic analysis, which helps to reduce costs and increase efficiency, and improve the service performance and service life of the high-speed dispensing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic structural diagram of a test device for a nozzle and an ejector pin of a high-speed dispensing valve according to an embodiment of the present invention;

[0024] Figure 2 is a front structural diagram of a test device for a nozzle and an ejector pin of a high-speed dispensing valve according to an embodiment of the present invention;

[0025] Figure 3 is a partial enlarged structural diagram of a test device for a nozzle and an ejector pin of a high-speed dispensing valve according to an embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of the ejector pin according to an embodiment of the present invention;

[0027] Figure 5 is a front and sectional structural diagram of the nozzle according to an embodiment of the present invention;

[0028] Icons: base 1, first clamping table 2, second clamping table 3, first fixture 4, second fixture 5, ejector pin 6, piezoelectric ceramic impact module 7, nozzle 8, dynamometer 9, groove 10, glue outlet hole 11, double-rail sliding platform 12, linear guide 13. Detailed implementation

[0029] 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] Embodiment

[0031] Combined with Figures 1 to 3 As shown, this embodiment provides a test device for a nozzle and an ejector pin of a high-speed dispensing valve, including a base 1, on which a first clamping table 2 and a second clamping table 3 are movably arranged; a first fixture 4 for fixing the ejector pin 6 is arranged on the first clamping table 2; a second fixture 5 is arranged on the second clamping table 3, and a piezoelectric ceramic impact module 7 is fixedly arranged on the second fixture 5, and a dynamometer 9 capable of fixedly arranging the nozzle 8 is arranged at the output end of the piezoelectric ceramic impact module 7;

[0032] By adjusting the first clamping table 2 and the second clamping table 3, the ejector pin 6 and the nozzle 8 can be made to approach or move away from each other on the same axis, and the nozzle 8 and the ejector pin 6 can be made to be in a critical contact state (the critical contact state means that the contact normal force measured by the dynamometer 9 is 0.1 - 1 N, preferably the contact normal force is 0.1 N); the piezoelectric ceramic impact module 7 is used to achieve high-frequency vibration of the nozzle 8 to impact the ejector pin 6; the dynamometer 9 is used to measure the vector force information of the nozzle 8 and feedback it to a computer for analysis and processing.

[0033] Specifically, in this embodiment, as shown in Figure 4 And Figure 5Taking the striker 6 and the nozzle 8 shown as an example, the striker 6 is in the shape of a long cylinder as a whole, and one end thereof that is in impact fit with the nozzle 8 is hemispherical. The nozzle 8 is in the shape of a convex Chinese character as a whole, and a groove 10 is provided at one end thereof that is in impact fit with the striker 6. A glue outlet hole 11 is provided at the bottom of the groove 10. After the hemispherical end of the striker 6 impacts on the groove 10, the glue outlet hole 11 is closed; when the hemispherical end of the striker 6 is away from the groove 10, the glue outlet hole 11 is opened.

[0034] In this embodiment, a double-rail sliding platform 12 is provided on the base 1, which includes two linear rails 13; the first clamping table 2 is slidably arranged on the linear rails 13; a first drive is provided on the double-rail sliding platform 12, which is used to drive the first clamping table 2 to move along the Y direction. The first fixture 4 is fixedly arranged on the first clamping table 2, and is provided with a through hole for installing the striker 6, and a limiting member is arranged along the radial direction of the through hole for fixing the striker 6.

[0035] A second drive and a third drive are provided on the second clamping table 3, which are respectively used to drive the second fixture 5 to move along the X direction and the Z direction. The piezoelectric ceramic impact module 7 is fixedly arranged on the second fixture 5. In this embodiment, the piezoelectric ceramic impact module 7 includes a piezoelectric ceramic actuator, a controller for controlling the piezoelectric ceramic actuator, and a signal generator electrically connected to the controller; of course, the controller is also electrically connected to a closed-loop control circuit and an amplifier circuit; the performance parameters of the piezoelectric ceramic impact module 7 include: a closed-loop stroke of 60 μm, a closed-loop resolution of 1.2 nm, a thrust of 800 N, a pulling force of 300 N, a capacitance of 6.0 μF, a dynamic working current coefficient of 12.5 μA / (Hz·μm), and a resonance frequency of 8.5 kHz (the maximum resonance frequency of the ceramic under external drive). The piezoelectric ceramic actuator generates an electrical signal through the signal generator, and converts electrical energy into mechanical energy to provide high-frequency vibration for the nozzle 8. By modulating sine wave signals with different frequencies and different amplitudes, the vibration frequency and amplitude of the fatigue impact between the nozzle 8 and the striker 6 can be controlled.

[0036] The output end of the actuator is connected to the threaded port of the force measuring instrument 9 through a threaded port; one end face of the nozzle 8 away from the striker 6 is adhesively connected to the side plane port of the force measuring instrument 9. The force measuring instrument 9 measures high-dynamic force based on the piezoelectric sensor principle, and the measurement range is -2 to 2 kN. Its natural frequency is as high as 27 kHz, and it can measure the vector force data when the nozzle 8 and the striker 6 impact each other in real time. That is, it monitors the magnitude and direction of the force value during the fatigue impact process in real time and transmits it to a computer for analysis.

[0037] The vector force information obtained through computer analysis feedback is used to adjust the contact position and posture between the nozzle 8 and the striker 6 in real time, so that only the contact normal force exists and there is no tangential force. If the tangential force measured by the force measuring instrument 9 is less than 0.1 N, it indicates that the center lines of the nozzle 8 and the striker 6 are on the same straight line. Accurately simulate the actual working conditions. By monitoring and analyzing the change of the force value in real time, if the force value suddenly rises or falls violently during the test, it indicates that the nozzle 8 and / or the striker 6 begins to experience fatigue wear.

[0038] In this embodiment, after the striker 6 and the nozzle 8 are fixed to the first fixture 4 and the force measuring instrument 9, their center lines are adjusted to the same axis, and the striker 6 and the nozzle 8 are in a critical contact state (the critical contact state is that the contact normal force measured by the force measuring instrument 9 is about 0.1 - 1 N); then the brake is turned on to realize the high-frequency vibration of the nozzle 8, so that the nozzle 8 impacts the striker 6; then the vector force data when the nozzle 8 and the striker 6 impact each other is measured in real time by the force measuring instrument 9 and transmitted to the computer for analysis.

[0039] In this embodiment, the first drive, the second drive, and the third drive are driven by linear motors. The performance parameters of the linear motor are: rated thrust 40 N, peak thrust 120 N, rated current 2.5 A, peak current duration less than 1 s; system resolution 0.05 μm; effective stroke 160 mm; it can ensure that the repeat positioning accuracy of the piezoelectric ceramic impact module 7 in the Y direction reaches 1 μm. For the stage, the repeat positioning accuracy in the X direction should be better than 5 μm, and the repeat positioning accuracy in the Z direction should be better than 5 μm.

[0040] The following specifically describes the steps of testing the striker 6 and the nozzle 8 using the test device, which specifically includes the following steps:

[0041] The striker 6 and the nozzle 8 are respectively fixed on the first fixture 4 and the second fixture 5;

[0042] According to the position of the striker 6, the second fixture 5 is adjusted in the X direction and the Z direction through the second drive and the third drive, so that the center lines of the striker 6 and the nozzle 8 are on the same axis; and the first fixture 4 is adjusted in the Y direction through the first drive, so that the striker 6 and the nozzle 8 are in a critical contact state (the critical contact state is that the contact normal force measured by the force measuring instrument 9 is about 0.1 - 1 N);

[0043] Then, start the piezoelectric ceramic impact module 7 to drive the nozzle 8 to vibrate at a high frequency, so as to simulate the fatigue impact process between the nozzle 8 and the plunger 6 in the valve of the high-speed dispensing machine; wherein, the frequency and amplitude of the adjustable sine wave signal can be adjusted to enable the piezoelectric ceramic impact module 7 to drive the nozzle 8 to vibrate at a high frequency, thereby simulating the fatigue impact process between the nozzle 8 and the plunger 6 under different frequencies, impact forces and other working conditions;

[0044] The dynamometer 9 monitors the magnitude and direction of the force value in real time during the fatigue impact process and transmits the signal to the computer for processing and analysis; and the computer realizes the intelligent prediction of the fatigue performance and wear life of the nozzle 8 and the plunger 6 according to the magnitude and directionality of the force value and in combination with the artificial intelligence deep learning big data;

[0045] After the test is completed, stop the actuator, move the plunger 6 and the nozzle 8 away from each other, turn off the power supply, and remove the plunger 6 and the nozzle 8.

[0046] The present invention provides a test device for the nozzle and plunger of a high-speed dispensing valve, which realizes the high-frequency vibration of the nozzle 8 through the piezoelectric ceramic impact module 7, and then controls the vibration frequency and amplitude of the fatigue impact between the nozzle 8 and the plunger 6; and based on the dynamometer 9, the magnitude and direction of the force value during the fatigue impact process are monitored in real time. If the force value suddenly rises or falls violently during the test, it indicates that the nozzle 8 and the plunger 6 begin to suffer from fatigue wear; and then according to the magnitude and directionality of the force value and in combination with the artificial intelligence deep learning big data of the computer, the intelligent prediction of the fatigue performance and wear life of the nozzle 8 and the plunger 6 is realized. At the same time, the selection and optimization of different materials and structures of the nozzle 8 and the plunger 6 can also be carried out according to the fatigue test results and wear characteristic analysis, which helps to reduce costs and increase efficiency, and improve the service performance and service life of the high-speed dispensing valve.

[0047] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0050] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A test device for a nozzle and a striker of a high-speed dispensing valve, comprising a base, characterized in that: The base is movably provided with a first clamping platform and a second clamping platform; the first clamping platform is provided with a first fixture for fixing the striker; the second clamping platform is provided with a second fixture, a piezoelectric ceramic impact module is fixedly provided on the second fixture, and a dynamometer capable of fixing a nozzle is provided at the output end of the piezoelectric ceramic impact module; By adjusting the first clamping platform and the second clamping platform, the impact pin and the nozzle can be placed on the same axis and approach or move away from each other, and the nozzle and the impact pin can be placed in a critical contact state; the piezoelectric ceramic impact module is used to achieve high-frequency vibration of the nozzle to impact the impact pin; the dynamometer is used to measure the vector force information of the nozzle and feed it back to the computer for analysis and processing.

2. The testing device for the nozzle and the striker of the high-speed dispensing valve according to claim 1, characterized in that: The piezoelectric ceramic impact module includes a piezoelectric ceramic actuator, a controller for controlling the piezoelectric ceramic actuator, and a signal generator electrically connected to the controller.

3. The testing device for the nozzle and the striker of the high-speed dispensing valve according to claim 1, characterized in that: An end surface of the nozzle away from the striker is bonded to a side plane port of the dynamometer.

4. The testing device for the nozzle and the striker of the high-speed dispensing valve according to claim 1, characterized in that: The first fixture is provided with a through hole for installing the striker, and a limiting member is provided along the radial direction of the through hole for fixing the striker.

5. The testing device for the nozzle and the striker of the high-speed dispensing valve according to claim 1, characterized in that: The critical contact state is that the contact normal force measured by the dynamometer is 0.1-1N.

6. The testing device for the nozzle and the striker of a high-speed dispensing valve according to any one of claims 1 to 5, characterized in that: The base is provided with a first drive for driving the first fixture to move along the Y direction; the second clamping table is provided with a second drive and a third drive for driving the second fixture to move along the X direction and the Z direction respectively.

7. The testing device for the nozzle and the striker of the high-speed dispensing valve according to claim 6, characterized in that: A double-guide rail sliding platform is arranged on the base, which includes two linear guide rails; the first clamping platform can be slidably arranged on the linear guide rails.

8. A testing method, using the testing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Fixing the striker and the nozzle on the first fixture and the second fixture respectively; Adjusting the positions of the first fixture and the second fixture according to the position of the striker so that the center lines of the striker and the nozzle are on the same axis; and placing the striker and the nozzle in a critical contact state; Starting the piezoelectric ceramic impact module to drive the nozzle to vibrate at high frequency to simulate the fatigue impact process of the nozzle and the striker in the high-speed dispensing machine valve under different working conditions; The dynamometer monitors the magnitude and direction of the force value in real time online during the fatigue impact process, and transmits the signal to the computer for processing and analysis; After the test is completed, the piezoelectric ceramic impact module is stopped, the striker and the nozzle are moved away from each other, the power is turned off, and the striker and the nozzle are removed.

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