Device and method for measuring dynamic characteristics of electromagnetic switch valve

Abstract

The invention discloses an electromagnetic switch valve dynamic characteristic measuring device and method, and belongs to the field of hydraulic electromagnetic switch valve measurement. The device comprises a valve block, a groove-shaped structure used for installing an electromagnetic switch valve, and a pressure sensor interface and a vibration sensor installation part which are integrated on the valve block. And a flow channel communicated with a P port and a T port of the electromagnetic switch valve is arranged in the valve block. During measurement, the current of the coil is monitored through the current sensor, the pressure of the valve port is monitored through the pressure sensor to suddenly rise / drop caused by the fact that the valve element starts to move, and impact vibration generated when the valve element reaches the limit position is monitored through the vibration sensor. The opening delay time, the opening action time, the closing delay time and the closing action time of the electromagnetic switch valve are accurately calculated by comprehensively analyzing the time sequence change of the current, the pressure and the vibration signal. According to the invention, non-contact and high-precision measurement of the complete dynamic characteristics of the electromagnetic switch valve under the working condition of pressure is realized, the structure is simple, and the applicability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic electromagnetic on-off valve measurement. In particular, it relates to a dynamic characteristic measurement device and method for an electromagnetic on-off valve. BACKGROUND

[0002] The hydraulic electromagnetic on-off valve is opened and closed by receiving rising edge and falling edge signals from a controller. When the rising edge signal appears, the excitation voltage acts on the coil to cause the current to rise rapidly. When the current rises to the opening current value, the spool starts to move towards the maximum opening position. The time of this process is the opening delay time. When the spool moves to the maximum opening position, the opening process is completed. The time from the start of the spool movement to the maximum opening position is the opening action time. The sum of the opening delay time and the opening action time is the opening time. When the falling edge signal appears, the excitation voltage disappears. When the current falls to the closing current value, the spool starts to move from the maximum opening position to the initial position. The time of this process is the closing delay time. When the spool moves to the initial position, the closing process is completed. The time from the spool moving from the maximum opening position to the initial position is the closing action time. The sum of the closing delay time and the closing action time is the closing time. The opening delay, opening action, closing delay, and closing action times are the complete dynamic characteristics of the electromagnetic on-off valve.

[0003] The complete dynamic characteristics of an electromagnetic on-off valve is a key parameter in the "time dimension" of industrial automation. Obtaining the complete dynamic characteristics of an electromagnetic on-off valve is of great significance to the design, control and optimization of industrial systems. Current methods for measuring dynamic characteristics mainly use vibration measurement, pressure measurement and displacement measurement methods individually, and there is no matching reasonable measurement device structure design. In the vibration measurement method, a vibration sensor is used to obtain the acceleration signal generated by the electromagnetic on-off valve at the opening and closing instants. This method can effectively obtain the total opening time and closing time of the valve, but cannot obtain the complete dynamic characteristics of the valve. In the pressure measurement method, a pressure sensor is used to measure the pressure signal change of the valve port or the flow passage inside the valve. This method can effectively obtain the opening delay and closing delay time of the valve, but cannot obtain the complete dynamic characteristics of the valve. This is because when the electromagnetic on-off valve is rapidly opened and closed, the pressure in the flow passage will oscillate and fluctuate significantly with the opening and closing of the valve, and the steady state of the pressure cannot be used to determine whether the valve has completely opened or closed. In the displacement measurement method, the displacement change of the armature or valve core can be measured by cutting open the internal structure of the valve body, thereby obtaining the complete dynamic characteristics of the valve. However, this method has limitations in that it cannot measure the dynamic characteristics under system pressure conditions, and it damages the valve body structure to some extent. For example, CN119935537A obtains the displacement of the valve core by optical non-contact measurement to obtain the dynamic characteristics of the valve. This method has the advantage of non-contact measurement, but it requires high structural integration and the fluid under system pressure conditions will affect the optical measurement. In summary, the current invention has obvious limitations in obtaining the complete dynamic characteristics of the electromagnetic on-off valve.

[0004] The complete dynamic characteristic response of an electromagnetic on-off valve is usually in the order of 0.1 ms, and high-precision measurement technology is needed to obtain accurate complete dynamic characteristics. A single sensor cannot obtain the complete dynamic characteristics of the valve, and only by combining the functions of different sensors can the complete dynamic characteristics be collected. When a reference arm is installed on the armature inside the valve to obtain the dynamic characteristics by a laser displacement sensor, the added structure increases the weight of the valve core, and the motion mass of the valve core changes when the electromagnetic force acts, thereby causing large differences in the dynamic characteristics of the valve. Therefore, non-contact measurement can better maintain the original dynamic characteristics of the valve in terms of structure, and the structure design of the measurement device needs to avoid changes to the valve structure while achieving effective measurement results. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a dynamic characteristic measurement device and method for an electromagnetic on-off valve.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A dynamic characteristic measurement device for an electromagnetic on-off valve, characterized in that it comprises:

[0008] a valve block, which is internally provided with a hydraulic P port flow channel and a hydraulic T port flow channel, and is provided with a mounting structure for fixedly mounting an electromagnetic switch valve, so that the P port of the measured electromagnetic switch valve is in communication with the hydraulic P port flow channel, and the T port is in communication with the hydraulic T port flow channel;

[0009] a pressure sensor connecting structure, which is arranged on the valve block and in communication with the hydraulic P port flow channel, and is used for mounting a pressure sensor to detect the pressure change of the P port of the electromagnetic switch valve;

[0010] a vibration sensor mounting portion, which is arranged on the valve block and corresponds to the mounting position of the electromagnetic switch valve, and is used for mounting a vibration sensor to detect the vibration generated by the action of the electromagnetic switch valve spool.

[0011] In the preferred technical solution, the pressure sensor connecting structure comprises a pressure sensor adapter, which is connected with the pressure sensor through an adapter.

[0012] In the preferred technical solution, a pressing device is further included, which is used for fastening the electromagnetic switch valve mounted on the valve block.

[0013] In the preferred technical solution, the vibration sensor mounting portion is a groove or a flat surface formed on the valve block.

[0014] An electromagnetic switch valve dynamic characteristic measurement method, characterized in that a pressure sensor, a vibration sensor, a current sensor, a hydraulic pump, a direct current power supply and a driver are used, and the method comprises the following steps:

[0015] The pressure sensor is mounted on the pressure sensor connecting structure, the vibration sensor is mounted on the vibration sensor mounting portion, and the current sensor is connected to the coil circuit of the electromagnetic switch valve.

[0016] The hydraulic pump is started to provide system pressure for the hydraulic P port flow channel;

[0017] The direct current power supply and the driver are used to provide controllable driving signals for the electromagnetic switch valve;

[0018] The current signal of the current sensor, the pressure signal of the pressure sensor and the vibration signal of the vibration sensor are synchronously collected;

[0019] The rising edge time and the falling edge time of the driving signal are determined according to the current signal;

[0020] The starting point of the opening movement and the starting point of the closing movement of the spool are respectively determined according to the sudden drop time and the sudden rise time of the pressure signal;

[0021] According to the characteristic peak time of the vibration signal, the opening end point of the valve core reaching the maximum opening position and the closing end point of the valve core returning to the initial position are determined respectively;

[0022] Based on the above time points, the opening delay time, opening action time, closing delay time and closing action time of the electromagnetic switch valve are calculated.

[0023] In the preferred technical solution, the step of calculating the dynamic characteristics according to the signal time sequence change specifically includes:

[0024] In the opening process:

[0025] The time point at which the current starts to rise is the rising edge time point;

[0026] The time point at which the pressure first drops sharply is the starting time point of the opening movement of the valve core;

[0027] The time point at which the vibration appears the first characteristic peak is the opening end time point of the valve core.

[0028] In the preferred technical solution, the step of calculating the dynamic characteristics according to the signal time sequence change specifically includes:

[0029] In the closing process:

[0030] The time point at which the current starts to drop sharply is the falling edge time point;

[0031] The time point at which the pressure first rises sharply is the starting time point of the closing movement of the valve core;

[0032] The time point at which the vibration appears the second characteristic peak is the closing end time point of the valve core.

[0033] In the preferred technical solution, the driving signal is a single-voltage, double-voltage or multi-voltage excitation mode.

[0034] The application discloses a dynamic characteristic measurement device of an electromagnetic switch valve.

[0035] The valve block has an internal flow channel and an electromagnetic switch valve mounting groove structure, the electromagnetic switch valve is mounted into the groove structure of the valve block, the P port of the electromagnetic switch valve is in communication with the P port of the internal flow channel of the valve block, and the T port of the electromagnetic switch valve is in communication with the T port of the internal flow channel of the valve block; the adapter is a connecting device of the pressure sensor and the valve block, and is used for connecting the pressure sensor and the P port flow channel in the valve block; the direct-current power supply provides an excitation voltage for the driver; when a high-level signal appears in the driver, the excitation voltage acts on the coil of the electromagnetic switch valve; when a low-level signal appears in the driver, the excitation voltage disappears; and the hydraulic pump provides system pressure for the internal flow channel of the valve block and the P port of the electromagnetic switch valve.

[0036] The pressure sensor reads the pressure data at the P port of the electromagnetic switch valve in real time; according to the fluid characteristics, when the valve core of the electromagnetic switch valve starts to move from the initial position to the maximum opening position, the pressure at the P port of the valve drops suddenly; when the electromagnetic switch valve starts to move from the maximum opening position to the initial position, the pressure at the P port of the valve rises suddenly due to the smaller valve port; all valve port pressure changes are recorded by the pressure sensor;

[0037] The vibration sensor reads the vibration amplitude of the electromagnetic switch valve in real time; according to the mechanical characteristics of the valve body structure, when the electromagnetic switch valve is opened, that is, when the valve core reaches the maximum opening position, a significant amplitude is generated and captured by the vibration sensor; when the electromagnetic switch valve is closed, that is, when the valve core reaches the initial position, a significant amplitude is generated and captured by the vibration sensor;

[0038] The current sensor reads the coil current of the electromagnetic switch valve in real time; according to the electromagnetic characteristics, the moment when the current starts to rise is equivalent to the moment when the rising edge signal of the control signal appears, and the moment when the current drops is equivalent to the moment when the falling edge signal of the control signal appears; all coil current changes are recorded by the current sensor; the opening delay, opening action, closing delay and closing action time of the electromagnetic switch valve can be accurately obtained by combining the data of the current sensor, the pressure sensor and the vibration sensor.

[0039] Compared with the prior art, the beneficial effects of the present application are as follows:

[0040] 1. The electromagnetic switch valve dynamic characteristic measurement device and method provided by the present application utilize the electromagnetic characteristics of the coil, the fluid characteristics of the flow channel in the valve block and the mechanical characteristics of the electromagnetic switch valve structure, and effectively and accurately obtain the complete dynamic characteristics of the electromagnetic switch valve by the combined use of the current, pressure and vibration sensors.

[0041] 2. The electromagnetic switch valve dynamic characteristic measurement device provided by the present application realizes non-contact measurement in the structural design, effectively protects the original structure of the electromagnetic switch valve, and maintains the original dynamic characteristics of the valve in the structure by non-contact measurement.

[0042] 3. The electromagnetic switch valve dynamic characteristic measurement device and method provided by the present application, the pressure sensor can collect the pressure of the valve port under the condition of having system pressure, and is not affected by the fluctuation of the system pressure.

[0043] 4. The electromagnetic switch valve dynamic characteristic measurement device and method provided by the present application can measure the dynamic characteristics of the electromagnetic switch valve under any voltage driving mode, including but not limited to single voltage, three voltage, multi-voltage excitation, etc. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description only some of the embodiments of the present application, and for those skilled in the art, without paying the creative labor, can also be obtained from these drawings other drawings.

[0045] Figure 1 The dynamic characteristic measurement device structure of the electromagnetic switch valve is shown.

[0046] Figure 2 The current change curve of the electromagnetic switch valve coil collected by the current sensor of the present application is shown.

[0047] Figure 3 The pressure change curve of the P port of the electromagnetic switch valve collected by the pressure sensor of the present application is shown.

[0048] Figure 4 The acceleration change curve of the electromagnetic switch valve collected by the vibration sensor of the present application is shown.

[0049] Figure 5a The data collected by the vibration, pressure and current sensors of the electromagnetic switch valve in the opening stage of the present application;

[0050] Figure 5b The data collected by the vibration, pressure and current sensors of the electromagnetic switch valve in the closing stage of the present application.

[0051] In the figure:

[0052] 1-pressing device; 2-vibration sensor installation slot; 3-valve block; 4-electromagnetic switch valve; 5-electromagnetic switch valve spool; 6-T port flow passage in valve block; 7-P port flow passage in valve block; 8-pressure sensor adapter. DETAILED DESCRIPTION

[0053] The following embodiments will be described in detail in conjunction with the drawings, in which similar or identical parts are denoted by the same reference numerals, and in practical applications, the shape, thickness or height of each component can be enlarged or reduced. The embodiments of the present application are only used to illustrate the present application, and are not used to limit the scope of the present application. Any obvious modification or change made to the present application does not deviate from the spirit and scope of the present application.

[0054] As shown in Figure 1 and Figure 2 The present application provides a kind of electromagnetic switch valve dynamic characteristic measurement device and method, and its measurement device as shown in Figure 1 It includes pressing device 1, vibration sensor installation slot 2, valve block 3, electromagnetic switch valve 4, pressure sensor interface 8.

[0055] The compression device 1 is screwed into the valve block 3 to fasten the electromagnetic switch valve 4;

[0056] The vibration sensor installation slot 2 is a vibration sensor installation structure, and the vibration sensor is installed here to accurately capture the vibration amplitude of the electromagnetic switch valve 4.

[0057] The valve block 3 is a whole housing structure, including a valve block inner T port flow channel 6, a valve block inner P port flow channel 7, a vibration sensor installation slot 2, and an electromagnetic switch valve 4 installation slot structure, the electromagnetic switch valve 4 is installed into the valve block slot structure, the P port of the electromagnetic switch valve 4 is communicated with the valve block inner P port flow channel 7, and the T port of the electromagnetic switch valve 4 is communicated with the valve block inner T port flow channel 6.

[0058] The pressure sensor joint 8 is communicated with the pressure sensor and the valve block inner P port flow channel 7.

[0059] The electromagnetic switch valve dynamic characteristic measurement device and method provided by the application further includes a vibration sensor, a pressure sensor, a current sensor, a hydraulic pump, a direct current power supply and a driver when the specific measurement method is implemented.

[0060] The vibration sensor is installed at the vibration sensor installation slot 2 to collect the vibration amplitude of the electromagnetic switch valve 4 in real time.

[0061] The pressure sensor is installed at the pressure sensor joint 8 to collect the pressure change of the valve port of the electromagnetic switch valve 4 in real time.

[0062] The current sensor is installed on the external circuit of the electromagnetic switch valve 4 to collect the current change of the coil of the electromagnetic switch valve 4 in real time.

[0063] The hydraulic pump provides system pressure for the valve block inner P port flow channel 7.

[0064] The direct current power supply provides an excitation voltage for driving the electromagnetic switch valve 4. When the driver appears a high level signal, the excitation voltage acts on the coil of the electromagnetic switch valve 4; when the driver appears a low level signal, the excitation voltage disappears.

[0065] The driver connects the direct current power supply and the coil lead of the electromagnetic switch valve 4 to excite the coil of the electromagnetic switch valve 4 in a single voltage or multiple voltage excitation mode.

[0066] To further illustrate the working process of the application, the electromagnetic switch valve dynamic characteristic measurement device and method of the application will be further described in combination with the embodiments.

[0067] Taking the single voltage excitation of the electromagnetic switch valve 4 as an example;

[0068] The hydraulic pump provides system pressure for the P port flow channel 7 in the valve block after starting, the pressure sensor displays the system pressure output by the hydraulic pump, and the vibration sensor displays the small vibration amplitude caused by pressure pulsation;

[0069] In the opening stage of the electromagnetic switch valve 4, the rising edge of the control signal appears, the driver releases the excitation voltage acting on the electromagnetic switch valve coil, the coil current begins to rise, and the electromagnetic switch valve spool 5 remains in a static state at the initial position during this process; when the coil current rises to the opening current value, the electromagnetic switch valve spool 5 starts to move from the initial position to the maximum opening position, and since the opening of the electromagnetic switch valve spool 5 increases from 0, the valve port pressure drops suddenly; the time node between the start of the current rising and the time node of the pressure drop is the opening delay time, and the current and pressure data in this change process are recorded by the sensor; then the electromagnetic switch valve spool 5 continues to move, and when it moves to the maximum opening position, the electromagnetic switch valve spool 5 collides with the valve body to produce a large vibration amplitude, which is obviously far more than other small amplitudes, and this moment represents the complete opening of the electromagnetic switch valve spool 5, and the time node between the time node of the pressure drop and the time node of the complete opening is the opening action time, and the vibration data in this change process are also recorded by the sensor; the data curves of the current, pressure, and vibration sensors in the opening stage of the electromagnetic switch valve 4 are shown in FIGS. Figure 2 、 3 、4.

[0070] In the closing stage of the electromagnetic switch valve 4, the falling edge of the control signal appears, the driver stops the voltage excitation, the coil current rapidly decreases, and due to the action of residual magnetism, the electromagnetic switch valve spool 5 remains in a static state at the maximum opening position during this process; when the coil current decreases to the closing current value, the electromagnetic switch valve spool 5 starts to move from the maximum opening position to the initial position, and since the opening of the electromagnetic switch valve spool 5 decreases from the maximum opening, the valve port pressure rises suddenly; the time node between the start of the current rapidly decreasing and the time node of the pressure rising is the closing delay time, and the current and pressure data in this change process are recorded by the sensor; then the electromagnetic switch valve spool 5 continues to move towards the initial position, and when it moves to the initial position, the electromagnetic switch valve spool 5 collides with the valve seat to produce a large vibration amplitude, which is obviously far more than other amplitudes, and this moment represents the complete closing of the electromagnetic switch valve spool 5, and the time node between the time node of the pressure rising and the time node of the complete closing is the closing action time, and the vibration data in this change process are also recorded by the sensor; the data curves of the current, pressure, and vibration sensors in the closing stage of the electromagnetic switch valve 4 are shown in FIGS. Figure 2 、 3 、4.

[0071] The data of the current, pressure, and vibration sensors in the closing stage of the electromagnetic switch valve 4 are integrated on the same time axis, as shown in FIG. Figure 5aAs shown, the turning point of each sensor value is marked, and the complete opening dynamic characteristics of the electromagnetic on-off valve 4 are obtained.

[0072] The data of the current, pressure and vibration sensors in the closing phase of the electromagnetic on-off valve 4 are integrated on the same time axis, as shown in FIG. 6. Figure 5b As shown, the turning point of each sensor value is marked, and the complete closing dynamic characteristics of the electromagnetic on-off valve 4 are obtained.

[0073] The measurement effect of the above example can be verified with the current change data, and the effectiveness of the present application can be effectively verified from the basic physical phenomena and current characteristics.

[0074] The present application provides a kind of electromagnetic on-off valve dynamic characteristic measuring device and method, utilize the electromagnetic characteristics of coil, the fluid characteristics of the flow passage in valve block and the mechanical characteristics of electromagnetic on-off valve structure, the complete dynamic characteristics of electromagnetic on-off valve are effectively and high-precision obtained by the combination use of current, pressure, vibration sensor;Its device structure design realizes non-contact measurement, effectively protects the original structure of electromagnetic on-off valve, and the non-contact measurement keeps the original dynamic characteristics of valve in structure;Since the pressure change caused by spool opening and closing is far greater than the pressure change caused by pressure pulsation, the present application can be used under the condition of system pressure, and is not affected by system pressure fluctuation;Single voltage driving mode is used in example to verify the effect of the proposed measuring device and method, since the universality of the present application, the dynamic characteristics of electromagnetic on-off valve under any voltage driving mode can also be accurately measured by the present application, including but not limited to single voltage, three voltage, multi-voltage excitation, etc.

[0075] In addition, it should be understood that, although the present application is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An electromagnetic on-off valve dynamic characteristic measuring device characterized by comprising: The utility model relates to a kind of valve block and its test method, including: Valve block (3), which is internally provided with hydraulic P port flow channel (7) and hydraulic T port flow channel (6), and is provided with mounting structure for fixing and installing electromagnetic switch valve (4), so that the P port of measured electromagnetic switch valve (4) is communicated with the hydraulic P port flow channel (7), and the T port is communicated with the hydraulic T port flow channel (6); Pressure sensor connection structure is arranged on the valve block (3) and communicated with the hydraulic P port flow channel (7), for installing pressure sensor to detect the pressure change of the P port of the electromagnetic switch valve (4); Vibration sensor mounting portion (2) is arranged on the valve block (3) and corresponds to the mounting position of the electromagnetic switch valve (4), for installing vibration sensor to detect the vibration generated by the action of the electromagnetic switch valve spool (5).

2. The electromagnetic on-off valve dynamic characteristic measuring apparatus according to claim 1, characterized by The pressure sensor connection structure includes a pressure sensor adapter (8), which is connected to the pressure sensor through an adapter.

3. The electromagnetic on-off valve dynamic characteristic measuring apparatus according to claim 1 or 2, characterized by It also includes a pressing device (1) for fastening the electromagnetic switch valve (4) installed on the valve block (3).

4. The electromagnetic on-off valve dynamic characteristic measuring apparatus according to claim 1, characterized by The vibration sensor mounting portion (2) is a groove or a flat surface formed on the valve block (3).

5. A method of measuring dynamic characteristics of an electromagnetic on-off valve, based on the measuring device according to any one of claims 1 to 4, characterized by, Using pressure sensor, vibration sensor, current sensor, hydraulic pump, DC power supply and driver, including the following steps: Install the pressure sensor on the pressure sensor connection structure, install the vibration sensor on the vibration sensor mounting portion (2), and connect the current sensor to the coil circuit of the electromagnetic switch valve (4); Start the hydraulic pump to provide system pressure for the hydraulic P port flow channel (7); Provide controllable driving signals for the electromagnetic switch valve (4) through the DC power supply and driver; Synchronously collect the current signal of the current sensor, the pressure signal of the pressure sensor, and the vibration signal of the vibration sensor; Determine the rising edge time and falling edge time of the driving signal according to the current signal; Determine the start point of the opening movement and the start point of the closing movement of the spool respectively according to the sudden drop time and sudden rise time of the pressure signal; Determine the opening end point of the spool (5) reaching the maximum opening position and the closing end point of returning to the initial position respectively according to the characteristic peak time of the vibration signal; Based on the above time points, calculate the opening delay time, opening action time, closing delay time and closing action time of the electromagnetic switch valve (4).

6. The method of claim 5, wherein, The step of calculating dynamic characteristics according to signal timing changes specifically includes: During opening: Take the time when the current starts to rise as the rising edge time; Take the time when the pressure first drops suddenly as the start time of the opening movement of the spool; Take the time when the first characteristic peak of vibration appears as the opening end time of the spool (5).

7. The method of claim 5, wherein, The step of calculating dynamic characteristics according to signal timing changes specifically includes: During closing: Take the time when the current starts to drop suddenly as the falling edge time; Take the time when the pressure first rises suddenly as the start time of the closing movement of the spool; Take the time when the second characteristic peak of vibration appears as the closing end time of the spool (5).

8. The method of claim 5, wherein, The driving signal is single-voltage, double-voltage or multi-voltage excitation mode.

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