Solenoid valve detection device and detection method based on electromagnetic drive effectiveness detection

Abstract

The present invention discloses a solenoid valve detection device based on electromagnetic drive effectiveness detection, comprising a detection control board, on which a display interface, a communication interface, a plurality of solenoid valve power supply selection interfaces, a plurality of solenoid valve electromagnetic drive interfaces, a plurality of solenoid valve detection selection interfaces, a work / detection switching interface, a calibration / detection switching interface, and a system power supply interface are arranged, and each interface is connected with a corresponding module or switch. The solenoid valve detection device based on electromagnetic drive effectiveness detection provided by the present invention, based on the inherent electrical characteristics of the electromagnetic coil, starts from the volt-ampere characteristics and the solution of the step equation, solves the basic principle of solenoid valve detection, provides a detection means for the solenoid valve effectiveness detection, and ensures the normal production working state.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic valves, and in particular relates to an electromagnetic valve detection device and a detection method based on electromagnetic drive effectiveness detection. Background Art

[0002] Solenoid valves are industrial equipment controlled by electromagnetics. They are basic automation components used to control fluids. They are actuators and are not limited to hydraulic or pneumatic. They are used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, and the accuracy and flexibility of the control can be guaranteed. There are many types of solenoid valves, and different solenoid valves play a role in different positions in the control system. The most commonly used ones are check valves, safety valves, directional control valves, speed regulating valves, etc.

[0003] With the economic development of our country, our manufacturing technology and industrial technology have also developed rapidly. The development of manufacturing and industry is inseparable from the solenoid valve, which is a simple but indispensable device. In actual production, some solenoid valves work frequently for a long time, and some solenoid valves work at a low frequency. For large tank areas, the linkage function of the solenoid valve must be realized. However, the effectiveness detection of the solenoid valve has always been a neglected link, or it relies on manual confirmation of its working characteristics to determine whether it is in an effective working state. There is a lack of an effective detection method to determine whether the solenoid valve is in an effective working state. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a solenoid valve detection device and detection method based on electromagnetic drive effectiveness detection. Based on the inherent electrical characteristics of the electromagnetic coil, it starts from the volt-ampere characteristics and the solution of the step equation, unravels the basic principles of solenoid valve detection, provides a detection means for the solenoid valve effectiveness detection, and ensures the normal production working state.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A solenoid valve detection device based on electromagnetic drive effectiveness detection comprises: a detection control board, on which a display interface, a communication interface, a plurality of solenoid valve power supply selection interfaces, a plurality of solenoid valve electromagnetic drive interfaces, a plurality of solenoid valve detection selection interfaces, a work / detection switching interface, a calibration / detection switching interface, and a system power supply interface are arranged; the display interface is connected to a display module, the communication interface is connected to a communication host, a plurality of solenoid valve power supply selection interfaces are connected to a work / detection universal switch, each solenoid valve electromagnetic drive interface is connected to a corresponding solenoid valve electromagnetic drive device, the work / detection universal switch is a universal conversion control switch for providing a working power supply to each solenoid valve electromagnetic drive device, each solenoid valve detection selection interface is connected to a corresponding solenoid valve detection selection switch, the system power supply interface is connected to a system power supply, the work / detection switching interface is connected to a work / detection switching switch, and the calibration / detection switching interface is connected to a calibration / detection switching switch.

[0007] Furthermore, the system power supply is a 380V power supply, the work / detection switch is a 24V DC power supply switch, the calibration / detection switch is a 24V DC power supply switch, each solenoid valve detection selection switch is a 24V DC power supply momentary push button switch, and the detection control board also includes a power indicator light interface. The system power supply interface is connected to the internal power indicator light interface, and the power indicator light interface is connected to a power indicator light.

[0008] Furthermore, the detection device also includes an AC / DC module, a DC / DC module, a CPU, an AD sampling module, a constant current source, a standard resistor, an optocoupler and a decoupling diode group. The AC / DC module is connected to the system power supply interface and is used to convert the alternating current provided by the system power supply into direct current. The AC / DC module provides power to the constant current source and the DC / DC module through the normally open contacts of the working / detection switching switch. The DC / DC module provides power to the CPU, and the constant current source provides standard current to the standard resistor.

[0009] Furthermore, the common contact of the calibration / detection switching switch is connected to the input interface of the AD sampling module, the normally closed contact of the calibration / detection switching switch is connected to the two ends of the standard resistor, the normally open contact of the calibration / detection switching switch is connected to the common contact of the working / detection ten-thousand-turn switch, the normally closed contact of the working / detection ten-thousand-turn switch is connected to the decoupling diode group, the normally open contact of the working / detection ten-thousand-turn switch is connected to the normally open contacts of multiple solenoid valve detection selection switches, multiple solenoid valve power supply selection interfaces are respectively connected to the normally closed contacts of multiple solenoid valve detection selection switches, and the common contacts of multiple solenoid valve detection selection switches are respectively connected to the corresponding multiple solenoid valve electromagnetic drive interfaces.

[0010] Furthermore, the coil control signals of multiple solenoid valve detection selection switches are connected to multiple corresponding solenoid valve detection selection interfaces, the coil control signal of the calibration / detection switching switch is connected to the calibration / detection switching interface, the coil control signal of the work / detection switching switch is connected to the work / detection switching port, the solenoid valve detection selection interface, the calibration / detection switching interface, and the work / detection switching port are connected to the CPU, and the coil control signal of the work / detection universal switch is connected to the CPU.

[0011] Furthermore, the standard resistor is a precision power resistor, and the decoupling diode and the diodes connected in parallel on multiple solenoid valve detection selection switches, work / detection switching switches, calibration / detection switching switches, and work / detection 10,000-turn switches are all rectifier diodes with freewheeling function.

[0012] The present invention also discloses a solenoid valve detection method based on electromagnetic drive effectiveness detection, the detection method comprising the following steps:

[0013] S1: The detection device is powered on to put it into working state;

[0014] S2: Calibrate the detection device to ensure that the detection device meets the detection requirements;

[0015] S3: Using the detection device to detect the solenoid valves one by one to determine the effectiveness of the electromagnetic drive of the solenoid valves.

[0016] Furthermore, step S1 specifically switches the work / detection switching switch to the detection state, connects the detection control board to the system power supply, and initializes the detection control board. At this time, the work / detection switching switch is in the energized state, and multiple solenoid valve detection selection switches, calibration / detection switching switches, and work / detection universal switches are all in the released state.

[0017] Furthermore, step S2 is specifically as follows:

[0018] S2.1. Calculate the designed theoretical voltage signal according to the constant current value set by the constant current source and the standard resistance value:

[0019] V S =I H ×R

[0020] Where: V S is the designed theoretical voltage, I H is the constant current value set by the constant current source, and R is the standard resistance value;

[0021] S2.2.AD sampling module collects the actual voltage signal V Y ;

[0022] S2.3. Calculate the calibration accuracy η, And the calibration result is displayed on the display module;

[0023] S2.4. Determine whether the calibration accuracy η meets the test requirements. If not, the sampling system needs to be corrected until the calibration accuracy η meets the test requirements.

[0024] Furthermore, step S3 is specifically as follows:

[0025] S3.1. Switch the calibration / detection switch to the detection state. At this time, the calibration / detection switch is in the energized state, the constant current source is loaded on the sampling signal line, connected to the common end of the working / detection switch contact, and the sampling signal is connected to the common contact of the working / detection switch through the calibration / detection switch;

[0026] S3.2. Press one of the multiple solenoid valve detection selection switches, the CPU sends a control signal, drives the working / detection switch to close through the optical coupler, opens the sampling channel, and connects the sampling channel to the normally closed contact of the pressed solenoid valve detection selection switch;

[0027] S3.3. Because the detection object is an electromagnetically driven coil with inductance, according to the step response characteristics of the inductor, the detection project is divided into three stages: charging stage, holding stage and discharging stage. Both the charging stage and the discharging stage have a certain duration. During the detection, the charging stage and the discharging stage should be avoided, and the detection should be carried out in the holding stage. In the holding stage, the inductance effect disappears, and only the resistance effect of the coil is retained. The resistance effect of the coil corresponds to the actual equivalent resistance value of the coil;

[0028] S3.4. According to the inherent resistance of the coil and the constant current value set by the constant current source, the designed theoretical voltage signal can be calculated according to step S2.1; the AD sampling module collects the actual voltage signal V Y ; Calculate the electromagnetic drive efficiency η, The calculation result is displayed on the display module. When η is not less than a certain set value, it is considered that the corresponding electromagnetic drive device is in a normal state. When η is less than a certain set value, it is considered that the coil parameter of the corresponding electromagnetic drive device is greatly different from the design value or the corresponding electromagnetic drive device has a fault.

[0029] S3.5. According to step S3.2 to step S3.4, press one of the multiple solenoid valve detection selection switches one by one, select the corresponding solenoid valve for detection, and display the calculation results on the display module;

[0030] S3.6. After all the solenoid valves have been inspected, switch the work / 10,000-turn switch to the working state, and switch the work / test switch to the working state to complete the inspection of all the solenoid valves.

[0031] Compared with the prior art, the electromagnetic valve detection device and detection method based on electromagnetic drive effectiveness detection provided by the present invention have the following beneficial effects:

[0032] The electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention includes a detection control board, a work / detection switching interface is provided on the detection control board, a work / detection switching interface is connected to a work / detection switching switch, when the work / detection switching switch is in a working state, the detection control board is disconnected from the system power interface, the detection control board is in a bypass state, at this time the electromagnetic valve is in a normal working state, and the working performance is not affected by the detection control board. When the electromagnetic valve needs to be detected, the work / detection switching switch is switched to the detection state, at this time, the detection control board is connected to the system power supply, the detection control board is energized, the detection control board is initialized, and the detection device is in an enabled state.

[0033] The solenoid valve detection device based on electromagnetic drive effectiveness detection provided by the present invention is provided with a calibration / detection switching interface on the detection control board, and the calibration / detection switching interface is connected to the calibration / detection switching switch. The detection control board is provided with a constant current source, a standard resistor and an AD sampling module. Based on the volt-ampere characteristic principle, the detection device is calibrated by calculating the theoretical voltage signal, collecting the actual voltage signal, and comparing the values ​​of the actual voltage signal and the theoretical voltage signal to ensure that the solenoid valve detection device itself is in a normal state, and can be used to detect the solenoid valve.

[0034] The electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention includes multiple electromagnetic valve power selection interfaces, multiple electromagnetic valve power selection interfaces are connected to a working / detection universal switch, and the working / detection universal switch is a universal conversion control switch that provides a working power supply for each electromagnetic valve electromagnetic drive device. Multiple electromagnetic valve detection selection interfaces are also provided on the detection control board, and each electromagnetic valve detection selection interface is connected to a corresponding electromagnetic valve detection selection switch. Providing multiple electromagnetic valve power selection interfaces and multiple electromagnetic valve detection selection interfaces facilitates the expansion of the number of electromagnetic valves that can be detected by the detection device, and the number of electromagnetic valve power selection interfaces and electromagnetic valve detection selection interfaces in the detection device can be configured according to actual conditions.

[0035] The electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention utilizes the step response characteristics of inductance. Because the essence of electromagnetic valve drive effectiveness detection is still the detection of the electromagnetic drive coil, the coil has an inductance characteristic. Based on the step response characteristics of the inductance, the detection process is divided into three stages: charging stage, holding stage, and discharging stage. The charging stage and the discharging stage have a certain duration. In the holding stage, the inductance effect disappears, and only the resistance effect of the coil is retained. The electromagnetic drive effectiveness of the electromagnetic valve can be judged by calculating the voltage design value, the actual voltage value collected by the AD sampling module, and comparing the deviation between the voltage design value and the actual voltage value collected by the AD sampling module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0037] Figure 1 A control system diagram of the electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention;

[0038] Figure 2 It is a system principle diagram of the electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention.

[0039] In the figure, 1. detection control board, 2. display interface, 3. communication interface, 4. solenoid valve power selection interface, 5. solenoid valve electromagnetic drive interface, 6. solenoid valve detection selection interface, 7. work / detection switching interface, 8. calibration / detection switching interface, 9. system power interface, 10. display module, 11. communication host, 12. work / detection universal switch, 13. solenoid valve electromagnetic drive device, 14. solenoid valve detection selection switch, 15. system power supply, 16. work / detection switching switch, 17. calibration / detection switching switch, 18. power indicator light interface, 19. power indicator light, 20. AC / DC module, 21. DC / DC module, 22. CPU, 23. AD sampling module, 24. constant current source, 25. standard resistor, 26. optocoupler, 27. decoupling diode group. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Please refer to Figure 1-Figure 2 , Figure 1 A control system diagram of the electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention; Figure 2It is a system principle diagram of the electromagnetic valve detection device based on electromagnetic drive effectiveness detection provided by the present invention.

[0042] The solenoid valve detection device based on electromagnetic drive effectiveness detection provided by the present invention includes: a detection control board 1, on which a display interface 2, a communication interface 3, four solenoid valve power supply selection interfaces 4, four solenoid valve electromagnetic drive interfaces 5, four solenoid valve detection selection interfaces 6, a work / detection switching interface 7, a calibration / detection switching interface 8, and a system power supply interface 9 are provided.

[0043] The display interface 2 is connected to a display module 10, which uses a 12864-type liquid crystal display screen. The data control interface of the liquid crystal display screen is connected to the display interface 2 of the detection control board 1; the communication interface 3 is connected to a communication host 11, which uses a host device for serial communication, and the communication interface 3 of the host is connected to the communication interface 3 of the detection control board 1; the four solenoid valve power selection interfaces 4 are connected to a work / detection universal switch 12, and each solenoid valve electromagnetic drive interface 5 is connected to a corresponding solenoid valve electromagnetic drive device 13. The work / detection universal switch 12 is a universal conversion control switch that provides a working power supply for each solenoid valve electromagnetic drive device 13. Each solenoid valve detection selection interface 6 is connected to a corresponding solenoid valve detection selection switch 14, the system power interface 9 is connected to a system power supply 15, the work / detection switching interface 7 is connected to a work / detection switching switch 16, and the calibration / detection switching interface 8 is connected to a calibration / detection switching switch 17.

[0044] The system power supply 15 is a 380V power supply, the work / detection switch 16 is a 24V DC power switch, the calibration / detection switch 17 is a 24V DC power switch, and each solenoid valve detection selection switch 14 is a 24V DC power inching type push button switch. The detection control board 1 also includes a power indicator light interface 18, the system power interface 9 is connected to the internal power indicator light interface 18, the power indicator light interface 18 is connected to a power indicator light 19, and the power indicator light 19 is used to display whether the system power supply 15 has been connected to the system power interface 9.

[0045] The detection device also includes an AC / DC module 20, a DC / DC module 21, a CPU 22, an AD sampling module 23, a constant current source 24, a standard resistor 25, an optical coupler 26 and a decoupling diode group 27. The standard resistor 25 is a precision power resistor. The decoupling diode group 27 is composed of four diodes connected in reverse parallel in pairs. The decoupling diode group 27 and the diodes connected in parallel on multiple solenoid valve detection selection switches 14, work / detection switching switches 16, calibration / detection switching switches 17, and work / detection universal switches 12 are all rectifier diodes with freewheeling function. The AC / DC module 20 is connected to the system power supply interface 9 and is used to convert the alternating current provided by the system power supply 15 into direct current. The AC / DC module 20 provides power to the constant current source 24 and the DC / DC module 21 through the normally open contact of the work / detection switching switch 16. The DC / DC module 21 provides power to the CPU 22. The constant current source 24 provides standard current to the standard resistor 25.

[0046] The common contact of the calibration / detection switching switch 17 is connected to the input interface of the AD sampling module 23, the normally closed contact of the calibration / detection switching switch 17 is connected to the two ends of the standard resistor 25, the normally open contact of the calibration / detection switching switch 17 is connected to the common contact of the working / detection universal switch 12, the normally closed contact of the working / detection universal switch 12 is connected to the decoupling diode group, the normally open contact of the working / detection universal switch 12 is connected to the normally open contacts of multiple solenoid valve detection selection switches 14, multiple solenoid valve power supply selection interfaces 4 are respectively connected to the normally closed contacts of multiple solenoid valve detection selection switches 14, and the common contacts of multiple solenoid valve detection selection switches 14 are respectively connected to the corresponding multiple solenoid valve electromagnetic drive interfaces 5.

[0047] The coil control signals of multiple solenoid valve detection selection switches 14 are connected to multiple corresponding solenoid valve detection selection interfaces 6, the coil control signal of the calibration / detection switching switch 17 is connected to the calibration / detection switching interface 8, the coil control signal of the work / detection switching switch 16 is connected to the work / detection switching cutout, the solenoid valve detection selection interface 6, the calibration / detection switching interface 8, and the work / detection switching cutout are connected to CPU22, and the coil control signal of the work / detection universal switch 12 is connected to CPU22.

[0048] The present invention also discloses a solenoid valve detection method based on electromagnetic drive effectiveness detection, the detection method comprising the following steps:

[0049] S1: The detection device is powered on to put it into working state;

[0050] S2: Calibrate the detection device to ensure that the detection device meets the detection requirements;

[0051] S3: Using the detection device to detect the solenoid valves one by one to determine the effectiveness of the electromagnetic drive of the solenoid valves.

[0052] In some specific embodiments, step S1 is specifically to switch the work / detection switching switch 16 to the detection state, connect the detection control board 1 to the system power supply 15, and initialize the detection control board 1. At this time, the work / detection switching switch 16 is in the attracted state, and multiple solenoid valve detection selection switches 14, calibration / detection switching switches 17, and work / detection universal switches 12 are all in the released state.

[0053] Step S2 is specifically as follows:

[0054] S2.1. According to the constant current value set by the constant current source 24 and the resistance value of the standard resistor 25, the designed theoretical voltage signal is calculated:

[0055] V S =I H ×R

[0056] Where: V S is the designed theoretical voltage, I H is the constant current value set by the constant current source 24, and R is the resistance value of the standard resistor 25;

[0057] S2.2. The AD sampling module 23 collects the actual voltage signal V Y ;

[0058] S2.3. Calculate the calibration accuracy η, And the calibration result is displayed on the display module 10;

[0059] S2.4. Determine whether the calibration accuracy η meets the test requirements. Generally, when η is greater than or equal to 95%, the system can be considered to be operating normally and can be tested. Otherwise, the system error cannot meet the test requirements and the sampling system needs to be recalibrated until the calibration accuracy η meets the test requirements. The test results are displayed on the 12864 LCD screen, including theoretical values, sampling data and result evaluation.

[0060] Step S3 is specifically as follows:

[0061] S3.1. Switch the calibration / detection switch 17 to the detection state. At this time, the calibration / detection switch is in the closed state, the constant current source 24 is loaded on the sampling signal line, connected to the common end of the working / detection switch 16 contacts, and the sampling signal is connected to the common contact of the working / detection switch 12 through the calibration / detection switch 17;

[0062] S3.2. Press one of the four solenoid valve detection selection switches 14. Because each solenoid valve detection selection switch 14 is a 24V DC power supply inching type push button switch, it can be ensured that each press of a solenoid valve detection selection switch 14 is equivalent to determining the solenoid valve corresponding to the solenoid valve detection selection switch 14 to be detected, ensuring that one of the solenoid valves is detected each time. After pressing the solenoid valve detection selection switch 14, the CPU 22 sends a control signal, drives the working / detection 10,000-turn switch 12 to close through the optical coupler 26, opens the sampling channel, and connects the sampling channel to the normally closed contact of the pressed solenoid valve detection selection switch 14;

[0063] S3.3. Because the detection object is an electromagnetically driven coil with inductance, the detection project is divided into three stages according to the step response characteristics of the inductance: charging stage, holding stage and discharging stage.

[0064] (1) Charging stage: The charging stage can be equivalent to the step response of a first-order RL circuit, and its calculation formula is as follows:

[0065]

[0066] When t>0, (i L (0 + )=i L (0 - )=0) By solving the first-order differential equation, the step response function of the inductor current can be obtained as:

[0067]

[0068] The step response function of the inductor voltage is:

[0069]

[0070] We assume that i L (t) rises from 0 to 90% of the final design value for the charging stage, using I H represents the current provided by the constant current source 24, then

[0071]

[0072] Right now

[0073]

[0074] From the above, it can be concluded that the charging phase time is

[0075] (2) Holding stage: During the holding stage, the detection is performed. During the holding stage, the inductance effect disappears and only the resistance effect of the coil remains. The resistance effect of the coil corresponds to the actual equivalent resistance value of the coil.

[0076] (3) Discharge phase: The discharge phase is the process of releasing the energy stored in the coil during the holding phase. According to formula (6), the equation for the release process can be obtained as follows:

[0077]

[0078] In the formula, u i is the initial voltage for release, u0 is the final voltage for release. When the voltage is released by 90%, we consider the release process to be complete, so u0 = u i × 10%, we can get the release time as:

[0079]

[0080] It can be seen that the charging stage and the discharging stage both have a certain duration, and the voltage value collected by the AD sampling module 23 during the charging stage and the discharging stage is constantly changing. When detecting, the charging stage and the discharging stage should be avoided, and the detection should be performed during the holding stage to accurately obtain the monitoring data. During the holding stage, the inductance effect disappears, and only the resistance effect of the coil is retained. The resistance effect of the coil corresponds to the actual equivalent resistance value of the coil;

[0081] S3.4. According to the inherent resistance of the coil and the constant current value set by the constant current source 24, the designed theoretical voltage signal can be calculated according to step S2.1; the AD sampling module 23 collects the actual voltage signal V Y ; Calculate the electromagnetic drive efficiency η, The calculation result is displayed on the display module 10. When η is not less than a certain set value, the set value is generally set to 95%, and it is considered that the corresponding electromagnetic drive device is in a normal state. When η is less than a certain set value, it is considered that the coil parameters of the corresponding electromagnetic drive device are greatly different from the design values ​​or the corresponding electromagnetic drive device has a fault.

[0082] S3.5. According to step S3.2 to step S3.4, press one of the multiple solenoid valve detection selection switches 14 one by one, select the corresponding solenoid valve for detection, and display the calculation results on the display module 10;

[0083] S3.6. After all the solenoid valves have been inspected, switch the work / 10,000-turn switch to the working state, and switch the work / test switch 16 to the working state to complete the inspection of all the solenoid valves.

[0084] The solenoid valve detection device and detection method based on electromagnetic drive effectiveness detection provided by the present invention are based on the inherent electrical characteristics of the electromagnetic coil, starting from the volt-ampere characteristics and the solution of the step equation, thereby solving the basic principles of solenoid valve detection, providing a detection means for the solenoid valve effectiveness detection, and ensuring the normal production working state. It has strong practicality in the field of solenoid valve detection technology.

[0085] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A solenoid valve detection device based on electromagnetic drive effectiveness detection, used to detect the electromagnetic drive effectiveness of the solenoid valve, characterized in that: The detection device comprises: a detection control board, on which a display interface, a communication interface, a plurality of solenoid valve power supply selection interfaces, a plurality of solenoid valve electromagnetic drive interfaces, a plurality of solenoid valve detection selection interfaces, a work / detection switching interface, a calibration / detection switching interface, and a system power supply interface are provided. The display interface is connected to a display module, the communication interface is connected to a communication host, the plurality of solenoid valve power supply selection interfaces are connected to a work / detection universal switch, each solenoid valve electromagnetic drive interface is connected to a corresponding solenoid valve electromagnetic drive device, the work / detection universal switch is a universal conversion control switch for providing a working power supply to each solenoid valve electromagnetic drive device, each solenoid valve detection selection interface is connected to a corresponding solenoid valve detection selection switch, the system power supply interface is connected to a system power supply, the work / detection switching interface is connected to a work / detection switching switch, and the calibration / detection switching interface is connected to a calibration / detection switching switch; The detection device also includes an AC / DC module, a DC / DC module, a CPU, an AD sampling module, a constant current source, a standard resistor, an optocoupler and a decoupling diode group. The AC / DC module is connected to the system power interface and is used to convert the alternating current provided by the system power supply into direct current. The AC / DC module provides power to the constant current source and the DC / DC module through the normally open contact of the working / detection switching switch. The DC / DC module provides power to the CPU, and the constant current source provides a standard current to the standard resistor. The common contact of the calibration / detection switching switch is connected to the input interface of the AD sampling module, the normally closed contact of the calibration / detection switching switch is connected to the two ends of the standard resistor, the normally open contact of the calibration / detection switching switch is connected to the common contact of the working / detection universal switch, the normally closed contact of the working / detection universal switch is connected to the decoupling diode group, the normally open contact of the working / detection universal switch is connected to the normally open contacts of multiple solenoid valve detection selection switches, the multiple solenoid valve power supply selection interfaces are respectively connected to the normally closed contacts of multiple solenoid valve detection selection switches, and the common contacts of multiple solenoid valve detection selection switches are respectively connected to the corresponding multiple solenoid valve electromagnetic drive interfaces.

2. The electromagnetic valve detection device based on electromagnetic drive effectiveness detection according to claim 1 is characterized in that: The system power supply is a 380V power supply, the work / detection switch is a 24V DC power switch, the calibration / detection switch is a 24V DC power switch, each solenoid valve detection selection switch is a 24V DC power momentary push button switch, the detection control board also includes a power indicator light interface, the system power interface is connected to the internal power indicator light interface, and the power indicator light interface is connected to a power indicator light.

3. The electromagnetic valve detection device based on electromagnetic drive effectiveness detection according to claim 1 is characterized in that: The coil control signals of multiple solenoid valve detection selection switches are connected to multiple corresponding solenoid valve detection selection interfaces, the coil control signal of the calibration / detection switching switch is connected to the calibration / detection switching interface, the coil control signal of the work / detection switching switch is connected to the work / detection switching interface, the solenoid valve detection selection interface, the calibration / detection switching interface, and the work / detection switching interface are connected to the CPU, and the coil control signal of the work / detection switch is connected to the CPU.

4. The electromagnetic valve detection device based on electromagnetic drive effectiveness detection according to claim 3 is characterized in that: The standard resistor is a precision power resistor, and the decoupling diode and the diodes connected in parallel on multiple solenoid valve detection selection switches, the work / detection switching switch, the calibration / detection switching switch, and the work / detection 10,000-turn switch are all rectifier diodes with freewheeling function.

5. A detection method, using the electromagnetic valve detection device based on electromagnetic drive effectiveness detection as claimed in claim 4, characterized in that: The detection method comprises: S1: The detection device is powered on to put it into working state; S2: Calibrate the detection device to ensure that the detection device meets the detection requirements; S3: Using the detection device to detect the solenoid valves one by one to determine the effectiveness of the electromagnetic drive of the solenoid valves.

6. A detection method according to claim 5, characterized in that: Step S1 specifically switches the working / detection switching switch to the detection state, connects the detection control board to the system power supply, and initializes the detection control board. At this time, the working / detection switching switch is in the energized state, and multiple solenoid valve detection selection switches, the calibration / detection switching switch, and the working / detection universal switch are all in the released state.

7. A detection method according to claim 6, characterized in that: Step S2 is specifically as follows: S2.

1. Calculate the designed theoretical voltage signal according to the constant current value set by the constant current source and the standard resistance value: V S =I H ×R Where: V S is the designed theoretical voltage, I H is the constant current value set by the constant current source, and R is the standard resistance value; S2.

2. The AD sampling module collects the actual voltage signal V Y ; S2.

3. Calculate the calibration accuracy η, and displaying the calibration result on the display module; S2.

4. Determine whether the calibration accuracy η meets the test requirements. If not, the sampling system needs to be corrected until the calibration accuracy η meets the test requirements.

8. A detection method according to claim 7, characterized in that: Step S3 is specifically as follows: S3.

1. Switch the calibration / detection switch to the detection state. At this time, the calibration / detection switch is in the closed state, the constant current source is loaded on the sampling signal line, connected to the common end of the working / detection switch contact, and the sampling signal is connected to the common contact of the working / detection switch through the calibration / detection switch; S3.

2. Press one of the multiple solenoid valve detection selection switches, the CPU sends a control signal, drives the working / detection switch to close through the optical coupler, opens the sampling channel, and connects the sampling channel to the normally closed contact of the pressed solenoid valve detection selection switch; S3.

3. Because the detection object is an electromagnetically driven coil with inductance, according to the step response characteristics of the inductor, the detection project is divided into three stages: charging stage, holding stage and discharging stage. Both the charging stage and the discharging stage have a certain duration. During the detection, the charging stage and the discharging stage should be avoided, and the detection should be carried out in the holding stage. In the holding stage, the inductance effect disappears, and only the resistance effect of the coil is retained. The resistance effect of the coil corresponds to the actual equivalent resistance value of the coil; S3.

4. According to the inherent resistance of the coil and the constant current value set by the constant current source, the designed theoretical voltage signal can be calculated according to step S2.1; the AD sampling module collects the actual voltage signal V Y ; Calculate the electromagnetic drive efficiency η, The calculation result is displayed on the display module. When η is not less than a certain set value, it is considered that the corresponding electromagnetic drive device is in a normal state. When η is less than a certain set value, it is considered that the coil parameter of the corresponding electromagnetic drive device is greatly different from the design value or the corresponding electromagnetic drive device has a fault. S3.

5. According to step S3.2 to step S3.4, press one of the multiple solenoid valve detection selection switches one by one, select the corresponding solenoid valve for detection, and display the calculation results on the display module; S3.

6. After all the solenoid valves have been tested, the working / testing switch is switched to the working state, and the working / testing switch is switched to the working state to complete the testing of all the solenoid valves.

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