Portable electromagnetic valve on-line detection device

Abstract

The invention relates to a portable on-line detection device for an electromagnetic valve. The portable on-line detection device comprises a clamp box and a mainframe box, a slave control module and a plurality of wiring modules are arranged in the clamp box; each wiring module is used for being connected with an electromagnetic valve so as to control excitation or loss of excitation of a coil of the electromagnetic valve connected with the wiring module according to the coil control instruction; the slave control module is used for determining the tested electromagnetic valve according to the test instruction and outputting a coil control instruction to the wiring module connected with the tested electromagnetic valve; a test module, a main control module and a power supply module are arranged in the mainframe box; the test module is used for testing coil electrical parameters of the tested solenoid valve; the main control module is used for outputting a test instruction, collecting coil electrical parameters of the solenoid valve through the test module, and determining characteristic parameters of the tested solenoid valve according to changes of the coil electrical parameters. The electromagnetic valve coil performance detection device can detect the coil performance of a plurality of electromagnetic valves without dismounting the electromagnetic valves, and has the advantage of being convenient to carry.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant equipment maintenance, and in particular to a portable on-line detection device for a solenoid valve. Background Art

[0002] A large number of solenoid valves are deployed in nuclear power plants, many of which are used in important protection equipment. The current management measures are mainly regular replacement or functional testing. However, the existing solenoid valve test tools need to be conducted offline, and only detect whether the solenoid valve can open and close normally. There is a lack of component-level fault detection and data accumulation, such as the coil performance of the solenoid valve, which seriously restricts the accurate fault prediction and health management application at the component level. As a result, some solenoid valves fail before the next regular test even if they pass the offline test, thus affecting the stable operation of the nuclear power plant. Furthermore, due to the large number of solenoid valves in nuclear power plants, which are inconvenient to disassemble and dispersed, the test workload of the solenoid valves is large, which easily delays the maintenance period. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a portable on-line detection device for electromagnetic valves.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a portable electromagnetic valve online detection device, including a fixture box and a main box;

[0005] The fixture box is provided with a slave control module and a plurality of wiring modules;

[0006] Each of the wiring modules is used to connect to a solenoid valve to control the excitation or demagnetization of the coil of the solenoid valve connected thereto according to a coil control instruction;

[0007] The slave control module is connected to a plurality of the wiring modules, and is used to determine the solenoid valve to be tested according to the test instruction, and output the coil control instruction to the wiring module connected to the solenoid valve to be tested;

[0008] The main box is provided with a test module, a main control module and a power supply module;

[0009] The test module is connected to a plurality of the wiring modules and is used to test the coil electrical parameters of the solenoid valve under test, wherein the coil electrical parameters include coil voltage and coil current;

[0010] The main control module is connected to the slave control module and the test module, and is used to output the test instruction, collect the coil electrical parameters of the solenoid valve through the test module, so as to determine the characteristic parameters of the tested solenoid valve according to the changes of the coil electrical parameters, wherein the characteristic parameters include the pull-in voltage, the release voltage, the coil starting current, the coil steady-state current and the coil release current;

[0011] The power supply module, the slave control module, the test module, the main control module and a plurality of the wiring modules.

[0012] Preferably, the characteristic parameters also include coil inductance and coil resistance;

[0013] The test module includes a sampling resistor, a voltage divider unit, an LCR tester and a test switching unit;

[0014] The voltage dividing unit is used to generate a sampling signal according to the coil voltage input to the electromagnetic valve under test;

[0015] The LCR tester is connected to the sampling resistor, the main control module and the voltage divider unit, and is used to test the coil inductance and the coil resistance, test the sampling signal and the ground voltage of the sampling resistor, and feed back the measured values ​​of the coil inductance, the coil resistance, the sampling signal and the ground voltage to the main control module;

[0016] The test switching unit is connected to the main control module, the sampling resistor, the voltage divider unit, the LCR tester, the power supply module and the plurality of wiring modules, and is used to connect the sampling resistor in series to the coil power supply circuit of the solenoid valve under test and to supply power to the coil of the solenoid valve under test through the power supply module when testing the coil current and the coil voltage, and to connect the connection between the LCR tester and the coil of the solenoid valve under test when testing the coil inductance and the coil resistance.

[0017] Preferably, the test switching unit comprises a first relay, a second switch and two second relays;

[0018] The first relay includes a first excitation coil, a first common contact, a first normally closed contact, a second common contact, and a second normally closed contact; the first normally closed contact is connected to the power supply module to obtain a first power supply voltage for supplying power to the electromagnetic valve under test, the first common contact is connected to the first end of the second switch, the second normally closed contact is grounded, the second common contact is connected to the first end of the sampling resistor and the first end of the voltage divider unit, and the main control module is connected to the first excitation coil to control the first excitation coil to lose magnetism when testing the coil current and the coil voltage, so that the first common contact is closed with the first normally closed contact, and the second common contact is closed with the second normally closed contact;

[0019] The second end of the second switch is connected to the second end of the voltage dividing unit, and the main control module is connected to the control end of the second switch to control the second switch to be turned on when testing the coil current and the coil voltage;

[0020] Each of the second relays includes a second excitation coil, a third common contact, a third normally closed contact, a first normally open contact, a fourth common contact, a fourth normally closed contact and a second normally open contact; the third common contact, the first normally open contact, the fourth common contact and the second normally open contact are respectively connected to the LCR tester and the plurality of wiring modules, the third normally closed contact is connected to the second end of the second switch, the fourth normally closed contact is connected to the second end of the sampling resistor, and the main control module is connected to the second excitation coil to control the demagnetization of the second excitation coil when testing the coil current and the coil voltage, so that the third common contact is closed with the third normally closed contact, and the fourth common contact is closed with the fourth normally closed contact, and when testing the coil inductance and the coil resistance, the second excitation coil is controlled to be excited, so that the third common contact is closed with the first normally open contact, and the fourth common contact is closed with the second normally open contact.

[0021] Preferably, each of the wiring modules comprises a solenoid valve interface, and two third relays corresponding one-to-one to the two second relays;

[0022] The solenoid valve interface is used to connect the solenoid valve;

[0023] Each of the third relays includes a third excitation coil, a fifth common contact, a second normally open contact, a sixth common contact and a third normally open contact; the fifth common contact is connected to the third common contact of the corresponding second relay, the sixth common contact is connected to the fourth common contact of the corresponding second relay, the second normally open contact and the third normally open contact are connected to the solenoid valve interface, and the third excitation coil is connected to the slave control module to be energized when receiving the coil control instruction, so that the fifth common contact is closed with the second normally open contact, and the sixth common contact is closed with the third normally open contact.

[0024] Preferably, each of the wiring modules further comprises a plurality of discharge circuits corresponding one-to-one to the two third relays;

[0025] Each of the discharge circuits includes a resistor R27 and a diode D11; one end of the resistor R27 is connected to the second normally open contact of the corresponding third relay, the other end of the resistor R27 is connected to the cathode of the diode D11, and the anode of the diode D11 is connected to the third normally open contact of the corresponding third relay.

[0026] Preferably, the power supply module includes a lithium battery, a first stabilized power supply and a second stabilized power supply;

[0027] The lithium battery is used to supply power to the slave control module;

[0028] The first voltage-stabilized power supply is connected to the lithium battery and the test module and is used to supply power to the solenoid valve under test;

[0029] The second regulated power supply is connected to the lithium battery and the main control module and is used to supply power to the main control module;

[0030] The fixture box is also provided with a third voltage-stabilized power supply;

[0031] The third regulated power supply is connected to the lithium battery and the slave control module and is used to supply power to the slave control module;

[0032] The second regulated power supply and the third regulated power supply respectively include an isolation transformer circuit and a switching power supply circuit;

[0033] The second voltage-stabilized power supply includes an isolation transformer circuit connected to the lithium battery, the first relay and the second relay to supply power to the first relay and the second relay;

[0034] The switching power supply circuit included in the second regulated power supply is connected to the isolation transformer circuit included in the second regulated power supply to supply power to the main control module;

[0035] The third voltage-stabilized power supply includes an isolation transformer circuit connected to the lithium battery and the third relay to supply power to the third relay;

[0036] The switching power supply circuit included in the third regulated power supply is connected to the isolation transformer circuit included in the third regulated power supply to supply power to the slave control module.

[0037] Preferably, the isolation transformer circuit comprises an isolation power supply module U2, a capacitor C12, a resistor R7, a resistor R9 and a capacitor C10;

[0038] The input end of the isolated power supply module U2 is connected to the positive electrode of the lithium battery and is connected to the negative electrode of the lithium battery via the capacitor C12. The input end of the isolated power supply module U2 is also connected to the negative electrode of the lithium battery via the resistor R7 and the resistor R9. The connection node of the resistor R7 and the resistor R9 is connected to the output control end of the isolated power supply module U2. The output end of the isolated power supply module U2 is connected to the first excitation coil and the second excitation coil or to the third excitation coil to output a third power supply voltage that can power the relay.

[0039] Preferably, the switching power supply circuit comprises a first sub-switching power supply, a linear voltage stabilization circuit and a second sub-switching power supply;

[0040] The first sub-switching power supply includes a switch control chip U3, a capacitor C29, a capacitor C9, a diode D7, an inductor L3, a resistor R6, a resistor R24, a capacitor C26 and an inductor L2;

[0041] The input end of the switch control chip U3 is connected to the output end of the isolated power supply module U2 and is connected to the ground via the capacitor C29. The switch control end of the switch control chip U3 is connected to the cathode of the diode D7 and the first end of the inductor L3. The anode of the diode D7 is grounded. The second end of the inductor L3 is connected to the first end of the inductor L2 and is connected to the ground via the resistor R6 and the resistor R24. The connection node of the resistor R6 and the resistor R24 ​​is connected to the feedback end of the switch control chip U3. The second end of the inductor L3 is also connected to the ground via the capacitor C26. The second end of the inductor L2 outputs a fourth power supply voltage.

[0042] The input end of the linear voltage stabilizing circuit is connected to the second end of the inductor L2, and the output end of the linear voltage stabilizing circuit outputs a fifth power supply voltage;

[0043] The second sub-switching power supply includes a switch control chip U4, an inductor L1, a resistor R11, a resistor R13 and a capacitor C20;

[0044] The input end of the switch control chip U4 is connected to the output end of the linear voltage regulator circuit, the switch control of the switch control chip U4 is connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the ground via the resistor R11 and the resistor R13 in one way and to the ground via the capacitor C20 in another way, the connection node between the resistor R11 and the resistor R13 is connected to the feedback end of the switch control chip U4, and the second end of the inductor L1 is connected to the main control module or the slave control module to output a sixth power supply voltage that can power the control module.

[0045] Preferably, a plurality of pressure detection modules are also provided in the fixture box;

[0046] The plurality of pressure detection modules are connected to the plurality of wiring modules in a one-to-one correspondence and are respectively connected to the slave control module, and each of the pressure detection modules is used to measure the gas pressure in the solenoid valve under test when receiving an acquisition instruction, and output a pressure test signal according to the gas pressure;

[0047] The slave control module is also used to output the acquisition instruction to the pressure detection module corresponding to the solenoid valve under test after determining the solenoid valve under test, so as to obtain the pressure test signal; and the main control module is also used to determine whether the solenoid valve under test is in a loaded condition or a no-load condition according to the pressure test signal.

[0048] Preferably, each of the pressure detection modules comprises a pressure sensor and a fourth relay;

[0049] The pressure sensor is connected to the corresponding wiring module and is used to be set on the solenoid valve for mechanical connection;

[0050] The fourth relay includes a fourth excitation coil, a seventh common contact, a fifth normally open contact, an eighth common contact and a sixth normally open contact; the seventh common contact is connected to the second power supply voltage, the fifth normally open contact is connected to the power supply end of the pressure sensor through the corresponding wiring module, the eighth common contact is connected to the LCR tester, and the test signal output end of the pressure sensor is connected to the corresponding wiring module. The fourth excitation coil is connected to the slave control module to be excited when the acquisition instruction is received, so that the seventh common contact and the fifth normally open contact are closed, and the eighth common contact and the sixth normally open contact are closed.

[0051] The implementation of the present invention has the following beneficial effects: the coil performance of multiple solenoid valves can be tested without disassembling the solenoid valves, and the invention also has the advantage of being easy to carry, which plays a positive role in improving the maintenance efficiency of the solenoid valves and the safety of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0053] Figure 1 is a schematic diagram of the structure of a portable on-line detection device for a solenoid valve in some embodiments of the present invention;

[0054] Figure 2 is a circuit structure block diagram of a portable solenoid valve online detection device in some embodiments of the present invention;

[0055] Figure 3 is a circuit structure block diagram of a test module in some embodiments of the present invention;

[0056] Figure 4 is a circuit schematic diagram of a voltage divider unit in some embodiments of the present invention;

[0057] Figure 5 is a circuit schematic diagram of a test switching unit in some embodiments of the present invention;

[0058] Figure 6 is a circuit schematic diagram of an LCR tester in some embodiments of the present invention;

[0059] Figure 7 is a circuit schematic diagram of a solenoid valve interface in some embodiments of the present invention;

[0060] Figure 8 is a circuit diagram of a second relay in some embodiments of the present invention;

[0061] Fig. 9 is a circuit structure block diagram of a main control module in some embodiments of the present invention;

[0062] Fig.10 is a curve diagram of a coil current variation curve in some embodiments of the present invention;

[0063] Fig.11 is a circuit schematic diagram of a master control circuit or a slave control circuit in some embodiments of the present invention;

[0064] Fig.12 is a circuit schematic diagram of a triode in some embodiments of the present invention;

[0065] Fig.13 is a circuit structure block diagram of a power supply module in some embodiments of the present invention;

[0066] Fig.14 is a circuit schematic diagram of a first voltage-stabilized power supply in some embodiments of the present invention;

[0067] Fig.15 is a circuit schematic diagram of an isolation transformer circuit in some embodiments of the present invention;

[0068] Fig.16 is a circuit schematic diagram of a first sub-switching power supply in some embodiments of the present invention;

[0069] Fig.17 is a circuit schematic diagram of a linear voltage stabilizing circuit in some embodiments of the present invention;

[0070] Fig.18 is a circuit schematic diagram of a second sub-switching power supply in some embodiments of the present invention;

[0071] Fig.19 is a circuit schematic diagram of the fourth relay in some embodiments of the present invention. DETAILED DESCRIPTION

[0072] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0073] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0074] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0075] Figure 1 1 is a schematic diagram of the structure of a portable on-line detection device for an electromagnetic valve in some embodiments of the present invention. The device includes a fixture box 1 and a main box 2.

[0076] like Figure 2 As shown, a slave control module 11 and a plurality of wiring modules 12 are provided in the fixture box 1. Each wiring module 12 is used to connect to a solenoid valve to control the excitation or demagnetization of the coil of the solenoid valve connected thereto according to the coil control instruction. The slave control module 11 is connected to a plurality of wiring modules 12, and the slave control module 11 is used to determine the solenoid valve to be tested according to the test instruction, and output the coil control instruction to the wiring module 12 connected to the solenoid valve to be tested.

[0077] like Figure 2As shown, a test module 21, a main control module 22 and a power supply module 23 are provided in the main box 2. The test module 21 is connected to a plurality of wiring modules 12, and is used to test the coil electrical parameters of the solenoid valve under test. The coil electrical parameters include at least one of coil voltage, coil current, coil inductance and coil resistance. The main control module 22 is connected to the slave control module 11 and the test module 21, and is used to output a test instruction, and collects the coil electrical parameters of the solenoid valve through the test module 21, so as to determine the characteristic parameters of the solenoid valve under test according to the change of the coil electrical parameters, wherein the characteristic parameters include the pull-in voltage, the release voltage, the coil starting current, the coil steady-state current and the coil release current. The power supply module 23 is connected to a plurality of wiring modules 12, a plurality of pressure detection modules 14, the slave control module 11, the test module 21 and the main control module 22, so as to supply power to the plurality of wiring modules 12, a plurality of pressure detection modules 14, the slave control module 11, the test module 21 and the main control module 22.

[0078] It should be noted that, due to the complex on-site environment of the solenoid valve (such as the narrow space where the coil interface of some solenoid valves is located), and the large size and weight of the entire detection device, it is not convenient to directly move the entire device to the solenoid valve site for testing. In this embodiment, multiple wiring modules 12 connected to the solenoid valve are arranged in a smaller fixture box, and the test module 21 and the power supply module 23 with a larger size and weight are arranged in the main box 2, and then the wire connection between the fixture box 1 and the main box 2 is realized through cables, which makes it convenient for the staff to carry the fixture box 1 to the site where the solenoid valve is located to realize the connection. In addition, the slave control module 11 and the main control module 22 are preferably control circuits built by microprocessors, which are generally small in size and weight.

[0079] It should be noted that the staff can perform setting operations (such as operating a mouse, keyboard, touch screen, etc.) to input operation instructions to the main control module 22 to set the detection order of multiple solenoid valves, so that the main control module 22 can output test instructions that can represent the detection order of multiple solenoid valves according to the operation instructions, so that the slave control module 11 will input coil control instructions to multiple wiring modules 12 in sequence according to the detection order. Moreover, only after the detection work of the solenoid valve connected to one wiring module 12 is completed, the detection work of the solenoid valve connected to another wiring module 12 will be performed, so that the test module 21 can be used to detect each solenoid valve in turn, which helps to reduce the hardware required by the test module 21, can reduce the size and weight of the device, and help to improve the portability of the present invention.

[0080] In this embodiment, the staff can connect several solenoid valves that need to be tested through the wiring module 12, and then the control module 11 will determine the solenoid valve that needs to be tested in each round (i.e., the solenoid valve to be tested) according to the test instructions. After determining the solenoid valve to be tested, the coil control instruction will be output to the wiring module 12 connected to the solenoid valve to be tested, thereby controlling the excitation or demagnetization of the coil of the solenoid valve to be tested, and at the same time testing the coil electrical parameters of the solenoid valve to be tested through the test module, and finally determining the characteristic parameters of the solenoid valve to be tested according to the change of the coil electrical parameters through the main control module 22, so that the staff can determine whether the solenoid valve coil is abnormal according to the characteristic parameters, so as to realize the early replacement of the solenoid valve. It can be understood that the present invention can not only detect the coil performance of multiple solenoid valves without disassembling the solenoid valve, but also has the advantage of being easy to carry, which plays a positive role in improving the efficiency of solenoid valve maintenance and the safety of nuclear power plants.

[0081] In some embodiments, Figure 3 As shown, the test module 21 includes a sampling resistor 211 , a voltage divider unit 212 , an LCR tester 213 and a test switching unit 214 .

[0082] like Figure 3 As shown, the sampling resistor 211 is used to generate a sampling signal according to the coil voltage input to the electromagnetic valve under test. Figure 4 As shown, the voltage divider unit 212 includes a resistor R390, a resistor R391 and a voltage regulator D9. The resistor R390 is connected to the resistor R391 to form a voltage divider circuit, and the voltage divider circuit is connected to the test switching unit 214. The connection node of the resistor R390 and the resistor R391 is connected to the LCR tester 213 to input the sampling signal thereto. The connection node of the resistor R390 and the resistor R391 is also connected to the cathode of the voltage regulator D9, and the anode of the voltage regulator D9 is grounded. The function of the voltage regulator D9 is to prevent the sampling signal input to the LCR tester 213 from being over-voltage, thereby avoiding the LCR tester 213 from being damaged by over-voltage.

[0083] like Figure 3 As shown, the LCR tester 213 is connected to the sampling resistor 211, the main control module 22 and the voltage divider unit 212. The LCR tester 213 is used to test the coil inductance and coil resistance, test the sampling signal and the ground voltage of the sampling resistor 211, and feed back the measured values ​​of the coil inductance, coil resistance, sampling signal and the ground voltage to the main control module 22. It should be noted that in this embodiment, the LCR tester 213 is an existing LCR tester that can measure resistance, capacitance, inductance and voltage.

[0084] like Figure 3As shown, the test switching unit 214 is connected to the main control module 22, the sampling resistor 211, the voltage divider unit 212, the LCR tester 213, the power supply module 23 and multiple wiring modules 12, and is used to connect the sampling resistor 211 in series to the coil power supply circuit of the solenoid valve under test when testing the coil current and coil voltage, and to supply power to the coil of the solenoid valve under test through the power supply module, and to connect the connection between the LCR tester 213 and the coil of the solenoid valve under test when testing the coil inductance and coil resistance.

[0085] In some embodiments, Figure 5 As shown, the test switching unit 214 includes a first relay 2141 , a second switch 2142 and two second relays 2143 .

[0086] like Figure 5 As shown, the first relay 2141 includes a first excitation coil, a first common contact (corresponding to the third pin of the first relay 2141), a first normally closed contact (corresponding to the fourth pin of the first relay 2141), a second common contact (corresponding to the sixth pin of the first relay 2141), and a second normally closed contact (corresponding to the fifth pin of the first relay 2141). The first normally closed contact is connected to the power supply module 23 to obtain a first power supply voltage for supplying power to the electromagnetic valve under test, the first common contact is connected to the first end of the second switch 2142, the second normally closed contact is grounded, the second common contact is connected to the first end of the sampling resistor 211 and the first end of the voltage divider unit 212, and the main control module 22 is connected to the first excitation coil to control the first excitation coil to lose magnetism when testing the coil current and the coil voltage, so that the first common contact is closed with the first normally closed contact, and the second common contact is closed with the second normally closed contact.

[0087] like Figure 5 As shown, the second end of the second switch 2142 is connected to the second end of the voltage dividing unit 212, and the main control module 22 is connected to the control end of the second switch 2142 to control the second switch 2142 to be turned on when the coil current and the coil voltage are tested. The second switch 2142 may be a solid-state relay, and of course a triode, a MOS tube, etc. may also be used to replace the solid-state relay. In this embodiment, the second switch 2142 is a solid-state relay of model AQZ202.

[0088] like Figure 5As shown, each second relay 2143 includes a second excitation coil, a third common contact (corresponding to the third pin of the second relay 2143), a third normally closed contact (corresponding to the fourth pin of the second relay 2143), a first normally open contact (corresponding to the second pin of the second relay 2143), a fourth common contact (corresponding to the sixth pin of the second relay 2143), a fourth normally closed contact (corresponding to the fifth pin of the second relay 2143) and a second normally open contact (corresponding to the seventh pin of the second relay 2143). Figure 4 , Figure 5 and Figure 6 As shown, the third common contact, the first normally open contact, the fourth common contact and the second normally open contact are respectively connected to the LCR tester 213 and the plurality of wiring modules 12, the third normally closed contact is connected to the second end of the second switch 2142, the fourth normally closed contact is connected to the second end of the sampling resistor 211, and the main control module 22 is connected to the second excitation coil to control the demagnetization of the second excitation coil when testing the coil current and the coil voltage, so that the third common contact is closed with the third normally closed contact, and the fourth common contact is closed with the fourth normally closed contact, and to control the excitation of the second excitation coil when testing the coil inductance and the coil resistance, so that the third common contact is closed with the first normally open contact, and the fourth common contact is closed with the second normally open contact.

[0089] Understandably, if Figure 4 , Figure 5 ,and Figure 6 As shown, when testing the coil current and coil voltage, the main control module 22 controls the first excitation coil and the second excitation coil to be demagnetized, and controls the second switch to be turned on, so that the coil of the solenoid valve under test is connected in series with the sampling resistor 211 and is electrically excited. At the same time, the LCR tester 213 measures the ground voltage of the sampling resistor 211 through its fourth pin, and measures the voltage value of the sampling signal that can characterize the coil input voltage of the solenoid valve under test through its fourth pin. Therefore, it can be understood that after the resistance value of the sampling resistor 211 and the voltage division ratio of the voltage division unit 212 are stored in the main control module 22 in advance, the main control module 22 can calculate the coil current (equal to the ground voltage divided by the resistance value of the sampling resistor 211) according to the resistance value of the sampling resistor 211 and the voltage to ground. Furthermore, the main control module 22 restores the coil input voltage of the solenoid valve under test according to the voltage division ratio of the voltage division unit 212 and the voltage value of the sampling signal, and calculates the difference between the coil input voltage and the ground voltage to obtain the coil voltage. When testing the coil inductance and coil resistance, the main control module 22 will control the excitation of the first excitation coil and the second excitation coil, and control the second switch to be turned off, which is equivalent to connecting the 16th pin and the 18th pin of the LCR tester 213 to the positive pole of the coil of the solenoid valve under test, and connecting the 17th pin and the 19th pin to the negative pole of the coil of the solenoid valve under test, so that the LCR tester 213 measures the coil resistance and coil inductance.

[0090] In some embodiments, each wiring module 12 includes Figure 7 The solenoid valve interface 121, and Figure 8 The two third relays 122 shown correspond one to one with the two second relays 2143. The solenoid valve interface 121 is used to connect the solenoid valve. Specifically, the solenoid valve interface 121 may include two 4-wire terminal interfaces. Since the opening and closing of the solenoid valve is controlled by the excitation and demagnetization of its coil, for the convenience of detection, a cable connected in parallel with the coil power supply line of the solenoid valve may be led out and connected to a terminal connector matching the terminal interface included in the solenoid valve interface 121, so that the staff can implement the connection work on site.

[0091] like Figure 8 As shown, each third relay 122 includes a third excitation coil, a fifth common contact (corresponding to the fourth pin of the third relay 122), a second normally open contact (corresponding to the fifth pin of the third relay 122), a sixth common contact (corresponding to the ninth pin of the third relay 122) and a third normally open contact (corresponding to the eighth pin of the third relay 122). Figure 5 and Figure 8 As shown, the fifth common contact is connected to the third common contact of the corresponding second relay 2143, the sixth common contact is connected to the fourth common contact of the corresponding second relay 2143, the second normally open contact and the third normally open contact are connected to the solenoid valve interface 121, and the third excitation coil is connected to the slave control module 11, so as to be excited when receiving the coil control instruction, so that the fifth common contact is closed with the second normally open contact, and the sixth common contact is closed with the third normally open contact. It can be understood that when testing a certain solenoid valve (including testing the coil current, coil voltage, coil resistance and coil inductance, etc.), the slave control module 11 will output the coil control instruction to the third excitation coil of the third relay 122 connected to the solenoid valve, and the third excitation coil is excited, which is equivalent to connecting the two ends of the coil of the solenoid valve to the corresponding second relay 2143, so that the main control module 22 can realize the coil performance detection of the solenoid valve by controlling the test switching unit 214. It should be noted that Figure 8 The network labels CH3_5 and CH3_7 are connected to the first end of the coil of the solenoid valve, and the network labels CH3_6 and CH3_8 are connected to the second end of the coil of the solenoid valve, which is equivalent to leading out two wires at one end of the solenoid valve coil. This is to facilitate the LCR tester to use the four-wire resistance measurement method (Kelvin measurement method) to accurately test the coil resistance.

[0092] Since the solenoid valve coil is an inductive device with high power, a sudden power failure will cause a large reverse potential, which may damage the solenoid valve coil. In order to absorb the reverse potential, in some embodiments, such as Figure 8As shown, each wiring module 12 also includes a plurality of discharge circuits 123 corresponding to the two third relays 122. Further, each discharge circuit 123 includes a resistor R27 and a diode D11. One end of the resistor R27 is connected to the second normally open contact of the corresponding third relay 122, the other end of the resistor R27 is connected to the cathode of the diode D11, and the anode of the diode D11 is connected to the third normally open contact of the corresponding third relay 122. When the third excitation coil loses its magnetism, the reverse potential generated by the solenoid valve coil will be absorbed by the resistor R27 through the diode D11 to avoid damage to the solenoid valve coil.

[0093] In some embodiments, Fig. 9 As shown, the main control module 22 includes a host computer 221 and a main control circuit 222. The host computer 221 can communicate with the main control circuit 222 through a USB interface, and the host computer 221 is used to execute and obtain operation instructions and determine the characteristic parameters of the electromagnetic valve under test according to the changes in the coil electrical parameters.

[0094] In some embodiments, the host computer 221 may be a touch screen computer of model TCP-1051, and the staff may input operation instructions by operating the touch screen. Furthermore, the step of the host computer 221 determining the characteristic parameters of the solenoid valve under test according to the change of the coil electrical parameters includes: fitting the coil current change curve according to the change of the coil current; analyzing the coil current change curve through the pre-trained automatic interpretation model to determine the coil starting current, coil steady-state current and coil release current; determining the coil voltage corresponding to the moment when the coil current is equal to the coil starting current as the pull-in voltage, and determining the coil voltage corresponding to the moment when the coil current is equal to the coil release current as the release voltage. Fig.10For example, the current at point A1 corresponds to the coil starting current, the current at point A2 corresponds to the coil steady-state current, and the current at point A3 corresponds to the coil release current. It can be understood that the steps of establishing the automatic judgment model may include: using a large number of standard curves to train the neural network model so that the neural network model can identify that the coil current in the coil current change curve has an inflection point (i.e., point A1) for the first time in the process of gradually increasing, and determine the current at this point as the coil starting current; the neural network model will also identify that the coil current in the coil current change curve tends to change to a line segment parallel to the horizontal axis within a certain time (not less than 100ms), and determine the current corresponding to the middle position of the line segment (i.e., point A2) as the coil steady-state current; the neural network model will also identify that the coil current in the coil current change curve has an inflection point (i.e., point A3) for the first time in the process of gradually decreasing, and determine the current at this point as the coil release current. Of course, in order to more accurately determine the coil starting current, coil steady-state current and coil release current, the host computer 221 can also display the coil current change curve on the screen, so that the staff can manually confirm the coil starting current, coil steady-state current and coil release current by operating the touch screen.

[0095] like Fig. 9 As shown, the main control circuit 222 is connected to the slave control module 11 and the test module 21 , and the main control circuit 222 is used to output a test instruction according to the operation instruction, and to collect the coil electrical parameters of the solenoid valve through the test module 21 .

[0096] In some embodiments, the slave control module 11 includes a slave control circuit having the same circuit structure as the master control circuit 222 .

[0097] Furthermore, if Fig.11 As shown, the master control circuit 222 or the slave control circuit may include a single-chip microcomputer U6 of model STM32L151RCT6, and related peripheral components (including capacitor C1, capacitor C2, crystal oscillator Y1, indicator light D1 and indicator light D2, etc.). For the specific connection relationship between the single-chip microcomputer U6 and the related peripheral components, please refer to Fig.11 In addition, the main control circuit 222 and the single-chip microcomputer U6 in the slave control circuit can be connected to each other through a serial port, a USB interface, an RS485 interface, etc.

[0098] Since the control signal voltage output by the single-chip microcomputer U6 is relatively small (not greater than 3.3V), the single-chip microcomputer U6 cannot directly drive the first relay 2141, the second switch 2142, the second relay 2143 and the third relay 122. In order to improve the driving capability of the single-chip microcomputer U6, in some embodiments, the main control circuit 222 may also include the following: Fig.12The transistor U15 shown has a power supply end connected to a third power supply voltage, multiple input ends included in the transistor U15 are respectively connected to multiple IO ports of the microcontroller U6, and multiple output ends included in the transistor U15 are respectively connected to a first relay 2141, a second switch 2142 and two second relays 2143 or connected to two third relays 122, wherein the model of the transistor U15 may be ULN2803, and when the microcontroller U6 inputs a high level to a certain input end of the transistor U15, the output end corresponding to the input end will output a voltage signal close to the third power supply voltage, thereby driving the relay or switch.

[0099] In some embodiments, Fig.13 As shown, the power supply module 23 includes a lithium battery 231 , a first regulated power supply 232 and a second regulated power supply 233 .

[0100] like Fig.13 As shown, the lithium battery 231 is used to supply power to the slave control module 11 . Specifically, the output voltage of the lithium battery 231 is approximately 24V.

[0101] like Fig.13 As shown, the first stabilized power supply 232 is connected to the lithium battery 231 and the test module 21, and the first stabilized power supply 232 is used to supply power to the solenoid valve under test. Since there are many types of solenoid valves in nuclear power plants, and the working voltages of different solenoid valves are different, specifically including solenoid valves with working voltages of 24V and 48V, in order to enable the first stabilized power supply 232 to provide detection voltage to solenoid valves with different working voltages, the first stabilized power supply 232 can be an existing adjustable power supply capable of outputting 24V to 50V. The specific circuit diagram of the first stabilized power supply 232 can be referred to Fig.14 , and the model of the voltage regulator controller U61 can be LM5118, and the main control module 22 can realize the output voltage control of the first voltage regulator power supply 232 by adjusting the voltage value of the signal AD.

[0102] Furthermore, in some embodiments, a power monitoring circuit is also provided in the main chassis 2. Figure 6 As shown, the circuit monitoring circuit includes a resistor R15 and a resistor R16, one end of the resistor R15 is connected to the positive electrode of the lithium battery 231, and the other end is connected to the negative electrode of the lithium battery 231 through the resistor R16, and the connection node between the resistor R15 and the resistor R16 is connected to the LCR tester 213, so as to use the LCR tester 213 to measure the voltage value of the connection node. It can be understood that after the resistance ratio of the resistor R15 and the resistor R16 is pre-stored in the main control module 22, the main control module 22 can restore the voltage of the lithium battery 231 according to the voltage value of the connection node, so as to monitor the lithium battery 231.

[0103] like Fig.13As shown, the second regulated power supply 233 is connected to the lithium battery 231 and the main control module 22 , and the second regulated power supply 233 is used to supply power to the main control module 22 .

[0104] In some embodiments, Fig.13 As shown, a third voltage-stabilized power supply 13 is also provided in the fixture box 1. The third voltage-stabilized power supply 13 is connected to the lithium battery 231 and the slave control module 11, and the third voltage-stabilized power supply 13 is used to supply power to the slave control module 11. Since the fixture box 1 needs to be carried to the site to connect the solenoid valve, if the battery is set in the fixture box 1, the volume and weight of the fixture box 1 will increase, and the portability of the fixture box 1 will be reduced. Therefore, in this embodiment, the fixture box 1 is set to draw power from the lithium battery 231, and the function of the third voltage-stabilized power supply 13 is to step down the output voltage of the lithium battery 231 to provide a suitable working voltage to the slave control module 11.

[0105] In some embodiments, the second regulated power supply 233 and the third regulated power supply 13 include an isolation transformer circuit and a switching power supply circuit, respectively. The isolation transformer circuit included in the second regulated power supply 233 is connected to the lithium battery 231, the first relay 2141 and the second relay 2143 to supply power to the first relay 2141 and the second relay 2143, and the switching power supply circuit included in the second regulated power supply 233 is connected to the isolation transformer circuit included in the second regulated power supply 233 to supply power to the main control module 22. The isolation transformer circuit included in the third regulated power supply 13 is connected to the lithium battery 231 and the third relay 122 to supply power to the third relay 122, and the switching power supply circuit included in the third regulated power supply 13 is connected to the isolation transformer circuit included in the third regulated power supply 13 to supply power to the slave control module 11. It should be noted that, in this embodiment, the hardware circuit structure of the second regulated power supply 233 and the third regulated power supply 13 are the same. The difference is that the second regulated power supply 233 is arranged in the main chassis 2 to supply power to the main control module 22, while the third regulated power supply 13 is arranged in the fixture box 1 to supply power to the slave control module 11.

[0106] In some embodiments, Fig.15As shown, the isolation transformer circuit includes an isolation power module U2, a capacitor C12, a resistor R7, a resistor R9 and a capacitor C10. Wherein, the model of the isolation power module U2 can be URB2412LD. The input end of the isolation power module U2 is connected to the positive pole of the lithium battery 231 (corresponding to +24V_IN) and is connected to the negative pole of the lithium battery 231 through the capacitor C12, and the input end of the isolation power module U2 is also connected to the negative pole of the lithium battery 231 (corresponding to 24V_GND) through the resistor R7 and the resistor R9, and the connection node of the resistor R7 and the resistor R9 is connected to the output control end of the isolation power module U2, and the output end of the isolation power module U2 is connected to the first excitation coil and the second excitation coil or connected to the third excitation coil, so as to output the third power supply voltage (i.e., 12V DC voltage) that can power the relay. Further, the isolation transformer circuit may also include a fuse F1 connected in series between the input end of the isolation power module U2 and the positive electrode of the lithium battery 231, a capacitor C13 connected in parallel with the capacitor C12 to play a high-frequency filtering role, a transient voltage suppression diode TVS1 connected to the output end of the isolation power module U2 to suppress surges, and an indicator light D3 connected to the output end of the isolation power module U2 to indicate whether the output of the isolation power module U2 is normal. In addition, the third supply voltage is also used to power the host computer 221.

[0107] In some embodiments, the switching power supply circuit may include Fig.16 The first sub-switching power supply shown, Fig.17 The linear regulator circuit shown and Fig.18 The second sub-switching power supply is shown.

[0108] like Fig.16 As shown, the first sub-switching power supply includes a switch control chip U3, a capacitor C29, a capacitor C9, a diode D7, an inductor L3, a resistor R6, a resistor R24, a capacitor C26 and an inductor L2. Among them, the model of the switch control chip U3 can be TPS54560B. The input end of the switch control chip U3 is connected to the output end of the isolation power module U2 and is connected to the ground through the capacitor C29, the switch control end of the switch control chip U3 is connected to the cathode of the diode D7 and the first end of the inductor L3, the anode of the diode D7 is grounded, the second end of the inductor L3 is connected to the first end of the inductor L2 and is connected to the ground through the resistor R6 and the resistor R24, the connection node of the resistor R6 and the resistor R24 ​​is connected to the feedback end of the switch control chip U3, the second end of the inductor L3 is also connected to the ground through the capacitor C26, and the second end of the inductor L2 outputs the fourth supply voltage. Specifically, the switch control chip U3, the diode D7, the inductor L3, the resistor R6 and the resistor R24 ​​constitute a switching power supply, which is used to convert the third power supply voltage into a fourth power supply voltage (i.e., a 7V DC voltage) to prepare for the subsequent output of a stable fifth power supply voltage. Fig.16As shown, the first sub-switching power supply may also include a resistor R22 connected between the input terminal and the enable terminal of the switch control chip U3, a resistor R25 connected between the enable terminal and the ground of the switch control chip U3, a capacitor C32 connected between the compensation terminal (i.e., the COMP pin of the switch control chip U3) and the ground, and other peripheral components. For details, please refer to Fig.16 , I will not go into details here.

[0109] like Fig.17 As shown, the input end of the linear voltage regulator circuit is connected to the second end of the inductor L2, and the output end of the linear voltage regulator circuit outputs the fifth power supply voltage. Further, the linear voltage regulator circuit may include a linear voltage regulator U7 of model LM1085, and the function of the linear voltage regulator circuit is to convert the fourth power supply voltage into the fifth power supply voltage (i.e., 5V DC voltage). Although in theory, the output voltage of the lithium battery 231 can be converted into the fifth power supply voltage by the first sub-switching power supply, but because the positive voltage of the lithium battery 231 is actually related to the remaining power of the lithium battery 231, that is, the input voltage fluctuates, and is limited by the working mechanism of the switching power supply, if the input voltage fluctuates, it will affect the stability of its output voltage, and when the voltage difference between the input voltage (corresponding to 24V) and the output voltage (corresponding to 5V or 7V) is large, it will cause the output voltage ripple of the switching power supply to be large. The function of the linear voltage regulator circuit is to utilize the advantage of good stability of the linear power supply, and by cooperating with the first sub-switching power supply, the relatively unstable fourth power supply voltage is converted into a highly accurate fifth power supply voltage.

[0110] like Fig.18As shown, the second sub-switching power supply includes a switch control chip U4, an inductor L1, a resistor R11, a resistor R13 and a capacitor C20. Among them, the model of the switch control chip U4 can be RT8059GJ5. The input end of the switch control chip U4 is connected to the output end of the linear voltage regulator circuit, the switch control of the switch control chip U4 is connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the ground through the resistor R11 and the resistor R13, and the other end is connected to the ground through the capacitor C20, the connection node of the resistor R11 and the resistor R13 is connected to the feedback end of the switch control chip U4, and the second end of the inductor L1 is connected to the main control module 22 or the slave control module 11 to output the sixth power supply voltage (i.e., 3.3V DC voltage) that can power the control module (including the main control module and the slave control module). It can be understood that since the linear voltage regulator circuit should not directly output too much power, which will result in a large loss of electric energy, but the linear voltage regulator circuit has excellent voltage regulation performance, the present embodiment first converts the fourth power supply voltage into the fifth power supply voltage through the linear voltage regulator circuit, and then uses the second sub-switching power supply to convert the fifth power supply voltage into the sixth power supply voltage. Because the voltage of the fifth power supply voltage is stable and the voltage difference between the sixth power supply voltage and the fifth power supply voltage is small, the stability of the sixth power supply voltage can meet the stability requirements and can provide a stable power supply to the slave control circuit and the main control circuit 222.

[0111] In some embodiments, Fig.13 As shown, the fixture box 1 is also provided with a plurality of pressure detection modules 14. The plurality of pressure detection modules 14 are connected to the plurality of wiring modules 12 one by one, and the plurality of pressure detection modules 14 are also respectively connected to the slave control module 11, and each pressure detection module 14 is used to measure the gas pressure in the solenoid valve under test when receiving an acquisition instruction, and output a pressure test signal according to the gas pressure.

[0112] Correspondingly, the slave control module 11 is also used to output an acquisition instruction to the pressure detection module 14 corresponding to the solenoid valve under test after determining the solenoid valve under test, so as to obtain a pressure test signal; and the host computer 221 in the main control module 22 is also used to determine whether the solenoid valve under test is in a loaded condition or a no-load condition according to the pressure test signal. It should be noted that for some solenoid valves installed on pipelines for transmitting gas, the load on the coil is different depending on whether the solenoid valve is working under load. Specifically, when air is normally transmitted in the solenoid valve (i.e., under load), due to the influence of air resistance, the resistance to opening and closing of the solenoid valve is large, so the coil starting current is large, and when air is not transmitted in the solenoid valve (i.e., under no-load condition), the air resistance is small, and the resistance to opening and closing of the solenoid valve is small, so the coil starting current is small. Therefore, these solenoid valves will obtain different characteristic parameters due to being in different working conditions. In this embodiment, the upper computer 221 can restore the air pressure in the solenoid valve under test through the pressure test signal, and determine whether the air pressure in the solenoid valve under test is greater than the set air pressure value. When the air pressure in the solenoid valve under test is greater than the set air pressure value, it is determined that the solenoid valve under test is in a loaded working condition. When the air pressure in the solenoid valve under test is not greater than the set air pressure value, it is determined that the solenoid valve under test is in a no-load working condition, so that the staff can determine whether the characteristic parameters meet the requirements based on the working condition of the solenoid valve under test.

[0113] In some embodiments, each pressure detection module 14 includes a pressure sensor and a Fig.19 The fourth relay 141 is shown.

[0114] The pressure sensor is connected to the corresponding wiring module 12, and the pressure sensor is used to be set on the solenoid valve (such as by being connected to the valve core of the solenoid valve so as to be able to contact the gas in the solenoid valve) to output the pressure test signal according to the gas pressure in the solenoid valve.

[0115] like Fig.19As shown, the fourth relay 141 includes a fourth excitation coil, a seventh common contact (corresponding to the third pin of the fourth relay 141), a fifth normally open contact (corresponding to the fourth pin of the fourth relay 141), an eighth common contact (corresponding to the sixth pin of the fourth relay 141) and a sixth normally open contact (corresponding to the fifth pin of the fourth relay 141). The seventh common contact is connected to the second power supply voltage (generally 24V, which can be directly provided by the lithium battery 231), the fifth normally open contact is connected to the power supply end of the pressure sensor through the corresponding wiring module 12, the eighth common contact is connected to the LCR tester 213, and is connected to the test signal output end of the pressure sensor through the corresponding wiring module 12, and the fourth excitation coil is connected to the slave control module 11 to excite when receiving the acquisition instruction, so that the seventh common contact is closed with the fifth normally open contact, and the eighth common contact is closed with the sixth normally open contact. In this embodiment, when the slave control module 11 controls the excitation of the second excitation coil of the third relay 122, it also controls the excitation of the fourth excitation coil, so that the pressure sensor is powered and works, and then the voltage of the pressure test signal is tested by the LCR tester 213 and fed back to the host computer 221 through the main control circuit 222.

[0116] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0117] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A portable solenoid valve online detection device, characterized in that: It comprises a fixture box (1) and a mainframe box (2); The fixture box (1) is provided with a slave control module (11) and a plurality of wiring modules (12); Each of the wiring modules (12) is used to connect to a solenoid valve, so as to control the excitation or demagnetization of the coil of the solenoid valve connected thereto according to a coil control instruction; The slave control module (11) is connected to a plurality of the wiring modules (12) and is used to determine the electromagnetic valve to be tested according to the test instruction and output the coil control instruction to the wiring module (12) connected to the electromagnetic valve to be tested; The main box (2) is provided with a test module (21), a main control module (22) and a power supply module (23); The test module (21) is connected to a plurality of the wiring modules (12) and is used to test the coil electrical parameters of the solenoid valve under test, wherein the coil electrical parameters include coil voltage and coil current; The main control module (22) is connected to the slave control module (11) and the test module (21), and is used to output the test instruction, collect the coil electrical parameters of the solenoid valve through the test module (21), and determine the characteristic parameters of the tested solenoid valve according to the changes of the coil electrical parameters, wherein the characteristic parameters include the pull-in voltage, the release voltage, the coil starting current, the coil steady-state current and the coil release current; The power supply module (23) is connected to the slave control module (11), the test module (21), the master control module (22) and the plurality of wiring modules (12).

2. The portable on-line detection device for electromagnetic valves according to claim 1 is characterized in that: The characteristic parameters also include coil inductance and coil resistance; The test module (21) comprises a sampling resistor (211), a voltage dividing unit (212), an LCR tester (213) and a test switching unit (214); The voltage dividing unit (212) is used to generate a sampling signal according to the coil voltage input to the electromagnetic valve under test; The LCR tester (213) is connected to the sampling resistor (211), the main control module (22) and the voltage dividing unit (212), and is used to test the coil inductance and the coil resistance, test the sampling signal and the voltage of the sampling resistor (211) to the ground, and feed back the measured values ​​of the coil inductance, the coil resistance, the sampling signal and the voltage to the ground to the main control module (22); The test switching unit (214) is connected to the main control module (22), the sampling resistor (211), the voltage dividing unit (212), the LCR tester (213), the power supply module (23) and the plurality of wiring modules (12), and is used to connect the sampling resistor (211) in series to the coil power supply circuit of the solenoid valve under test and to supply power to the coil of the solenoid valve under test through the power supply module when testing the coil current and the coil voltage, and to connect the connection between the LCR tester (213) and the coil of the solenoid valve under test when testing the coil inductance and the coil resistance.

3. The portable on-line detection device for electromagnetic valves according to claim 2 is characterized in that: The test switching unit (214) comprises a first relay (2141), a second switch (2142) and two second relays (2143); The first relay (2141) comprises a first excitation coil, a first common contact, a first normally closed contact, a second common contact and a second normally closed contact; the first normally closed contact is connected to the power supply module (23) to obtain a first power supply voltage for supplying power to the electromagnetic valve under test, the first common contact is connected to the first end of the second switch (2142), the second normally closed contact is grounded, the second common contact is connected to the first end of the sampling resistor (211) and the first end of the voltage dividing unit (212), and the main control module (22) is connected to the first excitation coil to control the first excitation coil to demagnetize when testing the coil current and the coil voltage, so that the first common contact is closed with the first normally closed contact, and the second common contact is closed with the second normally closed contact; The second end of the second switch (2142) is connected to the second end of the voltage dividing unit (212), and the main control module (22) is connected to the control end of the second switch (2142) to control the second switch (2142) to be turned on when testing the coil current and the coil voltage; Each of the second relays (2143) comprises a second excitation coil, a third common contact, a third normally closed contact, a first normally open contact, a fourth common contact, a fourth normally closed contact and a second normally open contact; the third common contact, the first normally open contact, the fourth common contact and the second normally open contact are respectively connected to the LCR tester (213) and the plurality of wiring modules (12); the third normally closed contact is connected to the second end of the second switch (2142); the fourth normally closed contact is connected to the second end of the sampling resistor (211); the main control module (22) is connected to the second excitation coil to control the demagnetization of the second excitation coil when testing the coil current and the coil voltage, so that the third common contact is closed with the third normally closed contact and the fourth common contact is closed with the fourth normally closed contact; and when testing the coil inductance and the coil resistance, the second excitation coil is excited so that the third common contact is closed with the first normally open contact and the fourth common contact is closed with the second normally open contact.

4. The portable on-line detection device for electromagnetic valves according to claim 3 is characterized in that: Each of the wiring modules (12) comprises a solenoid valve interface (121) and two third relays (122) corresponding one-to-one to the two second relays (2143); The solenoid valve interface (121) is used to connect the solenoid valve; Each of the third relays (122) includes a third excitation coil, a fifth common contact, a second normally open contact, a sixth common contact and a third normally open contact; the fifth common contact is connected to the third common contact of the corresponding second relay (2143), the sixth common contact is connected to the fourth common contact of the corresponding second relay (2143), the second normally open contact and the third normally open contact are connected to the solenoid valve interface (121), and the third excitation coil is connected to the slave control module (11) to be excited when receiving the coil control instruction, so that the fifth common contact is closed with the second normally open contact, and the sixth common contact is closed with the third normally open contact.

5. The portable on-line detection device for electromagnetic valves according to claim 4 is characterized in that: Each of the wiring modules (12) further comprises a plurality of discharge circuits (123) corresponding one-to-one to the two third relays (122); Each of the discharge circuits (123) comprises a resistor R27 and a diode D11; one end of the resistor R27 is connected to the second normally open contact of the corresponding third relay (122), the other end of the resistor R27 is connected to the cathode of the diode D11, and the anode of the diode D11 is connected to the third normally open contact of the corresponding third relay (122).

6. The portable on-line detection device for electromagnetic valves according to claim 5, characterized in that: The power supply module (23) comprises a lithium battery (231), a first stabilized power supply (232) and a second stabilized power supply (233); The lithium battery (231) is used to supply power to the slave control module (11); The first voltage-stabilized power supply (232) is connected to the lithium battery (231) and the test module (21) and is used to supply power to the solenoid valve under test; The second voltage-stabilized power supply (233) is connected to the lithium battery (231) and the main control module (22) and is used to supply power to the main control module (22); The fixture box (1) is also provided with a third voltage-stabilized power supply (13); The third regulated power supply (13) is connected to the lithium battery (231) and the slave control module (11) and is used to supply power to the slave control module (11); The second regulated power supply (233) and the third regulated power supply (13) respectively comprise an isolation transformer circuit and a switch power supply circuit; The second voltage-stabilized power supply (233) includes an isolation transformer circuit connected to the lithium battery (231), the first relay (2141) and the second relay (2143) to supply power to the first relay (2141) and the second relay (2143); The switching power supply circuit included in the second regulated power supply (233) is connected to the isolation transformer circuit included in the second regulated power supply (233) to supply power to the main control module (22); The third voltage-stabilized power source (13) includes an isolation transformer circuit connected to the lithium battery (231) and the third relay (122) to supply power to the third relay (122); The switching power supply circuit included in the third regulated power supply (13) is connected to the isolation transformer circuit included in the third regulated power supply (13) to supply power to the slave control module (11).

7. The portable on-line detection device for electromagnetic valves according to claim 6, characterized in that: The isolation transformer circuit includes an isolation power supply module U2, a capacitor C12, a resistor R7, a resistor R9 and a capacitor C10; The input end of the isolated power module U2 is connected to the positive electrode of the lithium battery (231) and is connected to the negative electrode of the lithium battery (231) via the capacitor C12. The input end of the isolated power module U2 is also connected to the negative electrode of the lithium battery (231) via the resistor R7 and the resistor R9. The connection node of the resistor R7 and the resistor R9 is connected to the output control end of the isolated power module U2. The output end of the isolated power module U2 is connected to the first excitation coil and the second excitation coil or to the third excitation coil, so as to output a third power supply voltage capable of powering the relay.

8. The portable on-line detection device for electromagnetic valves according to claim 7 is characterized in that: The switching power supply circuit comprises a first sub-switching power supply, a linear voltage stabilizing circuit and a second sub-switching power supply; The first sub-switching power supply includes a switch control chip U3, a capacitor C29, a capacitor C9, a diode D7, an inductor L3, a resistor R6, a resistor R24, a capacitor C26 and an inductor L2; The input end of the switch control chip U3 is connected to the output end of the isolated power supply module U2 and is connected to the ground via the capacitor C29. The switch control end of the switch control chip U3 is connected to the cathode of the diode D7 and the first end of the inductor L3. The anode of the diode D7 is grounded. The second end of the inductor L3 is connected to the first end of the inductor L2 and is connected to the ground via the resistor R6 and the resistor R24. The connection node of the resistor R6 and the resistor R24 ​​is connected to the feedback end of the switch control chip U3. The second end of the inductor L3 is also connected to the ground via the capacitor C26. The second end of the inductor L2 outputs a fourth power supply voltage. The input end of the linear voltage stabilizing circuit is connected to the second end of the inductor L2, and the output end of the linear voltage stabilizing circuit outputs a fifth power supply voltage; The second sub-switching power supply includes a switch control chip U4, an inductor L1, a resistor R11, a resistor R13 and a capacitor C20; The input end of the switch control chip U4 is connected to the output end of the linear voltage regulator circuit; the switch control of the switch control chip U4 is connected to the first end of the inductor L1; the second end of the inductor L1 is connected to the ground via the resistor R11 and the resistor R13 in one path and to the ground via the capacitor C20 in another path; the connection node between the resistor R11 and the resistor R13 is connected to the feedback end of the switch control chip U4; the second end of the inductor L1 is connected to the main control module (22) or the slave control module (11) to output a sixth power supply voltage capable of powering the control module.

9. The portable on-line detection device for electromagnetic valves according to any one of claims 2 to 8, characterized in that: The fixture box (1) is also provided with a plurality of pressure detection modules (14); The plurality of pressure detection modules (14) are connected to the plurality of wiring modules (12) in a one-to-one correspondence and are respectively connected to the slave control module (11); each of the pressure detection modules (14) is used to measure the gas pressure in the solenoid valve under test upon receiving an acquisition instruction, and output a pressure test signal according to the gas pressure; The slave control module (11) is also used to output the acquisition instruction to the pressure detection module (14) corresponding to the solenoid valve under test after determining the solenoid valve under test, so as to obtain the pressure test signal; and the main control module (22) is also used to determine whether the solenoid valve under test is in a loaded condition or a no-load condition based on the pressure test signal.

10. The portable on-line detection device for electromagnetic valves according to claim 9, characterized in that: Each of the pressure detection modules (14) comprises a pressure sensor and a fourth relay (141); The pressure sensor is connected to the corresponding wiring module (12) and is used to be arranged on the solenoid valve for mechanical connection; The fourth relay (141) comprises a fourth excitation coil, a seventh common contact, a fifth normally open contact, an eighth common contact and a sixth normally open contact; the seventh common contact is connected to the second power supply voltage, the fifth normally open contact is connected to the power supply end of the pressure sensor via the corresponding wiring module (12), the eighth common contact is connected to the LCR tester (213), the test signal output end of the pressure sensor is connected via the corresponding wiring module (12), and the fourth excitation coil is connected to the slave control module (11) so as to be excited when receiving the acquisition instruction, so that the seventh common contact and the fifth normally open contact are closed, and the eighth common contact and the sixth normally open contact are closed.

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