Electromagnetic valve detection device for nuclear power plant

Abstract

The utility model relates to an electromagnetic valve detection device for a nuclear power plant, which comprises a main control unit and a plurality of test units, and the plurality of test units comprise a first test unit, a second test unit and a third test unit. Wherein the first test unit comprises a first test voltage unit and a gas supply loop first pressure acquisition unit; and / or the first test unit comprises a first test voltage unit and a first voltage acquisition unit; the first test unit can test the excitation voltage and the field loss voltage of the to-be-tested solenoid valve by adopting different methods, and the test result is more accurate. Furthermore, the second test unit can test the direct current resistance value of the coil of the solenoid valve to be tested; the third test unit can test the connection state of a diode connected in parallel with the coil in the to-be-tested solenoid valve, there is no need to carry many fittings in on-site maintenance, and wiring is simple.

Description

Technical Field

[0001] The utility model relates to the field of solenoid valve detection, in particular to a solenoid valve detection device for nuclear power plants. Background Art

[0002] To ensure the safe operation of the instrument control system of a nuclear power plant, it is necessary to detect the electrical and mechanical properties of solenoid valves before use. However, in the existing solenoid valve testing technologies, the following problems exist: First, it is necessary to carry a large number of accessory sensors and additionally use a dedicated laptop computer to analyze test data, which is inconvenient to carry during on-site maintenance of solenoid valves; Second, usually multiple tools are combined to carry out different tests, the wiring is complex, and there are large errors in the tests. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a solenoid valve detection device for nuclear power plants.

[0004] The technical solution adopted by the utility model to solve its technical problem is: A solenoid valve detection device for nuclear power plants, comprising:

[0005] A main control unit and multiple test units, and the multiple test units include a first test unit;

[0006] The first test unit includes: A first test voltage unit connected to the first output end of the main control unit and the solenoid valve to be tested, and used to provide a first test voltage for the solenoid valve to be tested according to a first voltage adjustment signal output by the main control unit;

[0007] The first test unit further includes:

[0008] An air inlet end detachably connected to an external air source, and an air outlet end detachably connected to the air inlet end of the solenoid valve to be tested, and used to provide a test air pressure for the solenoid valve to be tested; a gas supply circuit;

[0009] Connected to the air outlet end of the solenoid valve to be tested and the first input end of the main control unit, and used to collect the air pressure at the air outlet end of the solenoid valve to be tested and output it to the main control unit, so that the main control unit analyzes the excitation voltage and demagnetization voltage of the solenoid valve to be tested according to the air pressure at the air outlet end of the solenoid valve to be tested and the first test voltage; and / or,

[0010] The first test unit further includes:

[0011] Connected to the second input end of the main control unit and the coil of the solenoid valve to be tested, and used to collect the voltage across the coil of the solenoid valve to be tested, so that the main control unit analyzes the excitation voltage and the demagnetization voltage according to the voltage across the coil. A first voltage acquisition unit.

[0012] Preferably, the air supply circuit includes a dryer, a pressure reducing valve, a stop valve, and an air storage tank connected in sequence, and further includes a second pressure acquisition unit connected to the air storage tank; the air storage tank is further connected to the intake end of the solenoid valve to be tested, and the dryer is further connected to the external air source.

[0013] Preferably, the solenoid valve detection device further includes an analog-to-digital conversion circuit, which is connected between the main control unit and the multiple test units and is used to perform analog-to-digital conversion on the signals transmitted by the test units and then transmit them to the main control unit.

[0014] Preferably, the first pressure acquisition unit includes a first pressure sensor and a signal conditioning circuit, and the first pressure sensor is connected to the first input end of the analog-to-digital conversion circuit through the signal conditioning circuit;

[0015] The first voltage acquisition unit includes a voltage measuring device and a signal conditioning circuit, and the voltage measuring device is connected to the second input end of the analog-to-digital conversion circuit through the signal conditioning circuit.

[0016] Preferably, the first test voltage unit includes: an output voltage adjustable circuit for outputting a corresponding first test voltage according to the first voltage adjustment signal, a switch circuit for disconnecting or conducting the first test voltage supplied to the solenoid valve to be tested according to the switch signal of the main control unit, and a signal relay for connecting both ends of the coil of the solenoid valve to be tested;

[0017] The input end of the output voltage adjustable circuit is connected to the main control unit, and the output end is connected to the signal relay; the input end of the switch circuit is connected to the main control unit, and the output end is connected to the signal relay.

[0018] Preferably, the multiple test units further include a second test unit for testing the DC resistance value of the coil of the solenoid valve to be tested. The second test unit includes a constant current source for providing a second test voltage to the solenoid valve to be tested, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and an amplifier;

[0019] The first end of the coil of the solenoid valve to be tested is connected to the constant current source, the second end is connected to the first end of the resistor R5, and the second end of the resistor R5 is connected to the constant current source and grounded; the non-inverting input end of the amplifier is connected to the first end of the coil of the solenoid valve to be tested through the resistor R1 and grounded through the resistor R3, the inverting input end of the amplifier is connected to the second end of the coil of the solenoid valve to be tested through the resistor R2, and the output end of the amplifier is connected to the main control unit and connected to the inverting input end of the amplifier through the resistor R4.

[0020] Preferably, the multiple test units further include a third test unit for testing the connection state of the diode connected in parallel with the coil in the solenoid valve to be tested. The third test unit includes a third test voltage unit for providing a third test voltage to the solenoid valve to be tested, a resistor R11, and a third voltage acquisition unit;

[0021] The coil of the solenoid valve to be tested and the resistor R11 are connected in series at both ends of the third test voltage unit, and the third voltage acquisition unit is connected across the coil of the solenoid valve to be tested.

[0022] Preferably, the solenoid valve detection device further includes a power supply unit for supplying power to the solenoid valve detection device;

[0023] The power supply unit includes a first power supply unit, a second power supply unit, and a switching unit. The switching unit is used to switch between the first power supply unit and the second power supply unit for power supply.

[0024] Preferably, the first power supply unit includes an adapter which is connected to a 220V AC power supply; the second power supply unit includes a battery unit; the first power supply unit is also connected to the second power supply unit to charge the second power supply unit.

[0025] Preferably, the solenoid valve detection device further includes an integrated signal output port. The multiple test units are all connected to the integrated signal output port and are connected to the solenoid valve to be tested through the integrated signal output port.

[0026] Implementing the solenoid valve detection device for nuclear power plants of the present invention has the following beneficial effects: The first test unit is connected to the main control unit. By using the air supply circuit and the first pressure acquisition unit, or the first voltage acquisition unit, different methods can be used to test the excitation voltage and demagnetization voltage of the solenoid valve to be tested, and the test results are more accurate. Further, the second test unit can test the DC resistance value of the coil of the solenoid valve to be tested; the third test unit can test the connection state of the diode connected in parallel with the coil in the solenoid valve to be tested. There is no need to carry a large number of accessories during on-site maintenance, and the wiring is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0028] Figure 1 is a schematic structural diagram of the solenoid valve detection device for nuclear power plants of the present invention;

[0029] Figure 2 is a schematic structural diagram of the first test unit in an embodiment of the present invention;

[0030] Figure 3It is a schematic structural diagram of the first test voltage unit of an embodiment of the present utility model;

[0031] Figure 4 It is a circuit schematic diagram of the switch circuit of an embodiment of the present utility model;

[0032] Figure 5 It is a schematic structural diagram of the first test unit of another embodiment of the present utility model;

[0033] Figure 6 It is a circuit schematic diagram of the second test unit of an embodiment of the present utility model;

[0034] Figure 7 It is a circuit schematic diagram of the third test unit of an embodiment of the present utility model;

[0035] Figure 8 It is a circuit schematic diagram of the signal conditioning circuit of some embodiments of the present utility model. Detailed implementation manners

[0036] For a clearer understanding of the technical features, purposes, and effects of the present utility model, the specific implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be noted that unless otherwise clearly specified and limited, terms such as "connected", "connected to", and "arranged" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. Terms such as "first", "second", "third", etc. are only for the convenience of describing the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0038] Such as Figure 1As shown, in an embodiment of a solenoid valve detection device for a nuclear power plant according to the present invention, the solenoid valve detection device includes: a main control unit 10 and a plurality of test units, and the plurality of test units are respectively a first test unit 11, a second test unit 12, and a third test unit 13.

[0039] Further, the solenoid valve detection device further includes an analog-to-digital conversion circuit 16, which can adopt the existing technology. It is connected between the input end of the main control unit 10 and the plurality of test units, and is used to perform analog-to-digital conversion on the signals transmitted by each test unit and then transmit them to the main control unit 10.

[0040] In this embodiment, an industrial computer is used as the main control unit 10. In other embodiments, an MCU and an industrial computer can also be combined as the main control unit 10, and the test data is collected by the MCU and then transmitted to the industrial computer.

[0041] In this embodiment, the first test unit 11 is used to test the excitation voltage and demagnetization voltage of the solenoid valve 20 to be tested by the pressure method. In addition, the leakage rate of the solenoid valve 20 to be tested can also be tested. As Figure 2 shown, the first test unit 11 includes: a first test voltage unit 111, a gas supply circuit 112, and a first pressure acquisition unit 113.

[0042] Among them, the first test voltage unit 111 is respectively connected to the first output end of the main control unit 10 and the solenoid valve 20 to be tested, and is used to provide a first test voltage for the solenoid valve 20 to be tested according to the first voltage adjustment signal output by the main control unit 10.

[0043] As Figure 3 shown, the first test voltage unit 111 includes: an output voltage adjustable circuit 1111 for outputting a corresponding first test voltage according to the first voltage adjustment signal, a switch circuit 1112 for disconnecting or conducting the first test voltage supplied to the solenoid valve 20 to be tested according to the switch signal of the main control unit 10, and a signal relay 1113 for connecting the two ends of the coil of the solenoid valve 20 to be tested. The input end of the output voltage adjustable circuit 1111 is connected to the main control unit 10, and the output end is connected to the signal relay 1113, and a first test voltage is provided for the solenoid valve 20 to be tested through the signal relay 1113; the input end of the switch circuit 1112 is connected to the main control unit 10, and the output end is connected to the signal relay 1113.

[0044] Specifically, the output voltage adjustable circuit 1111 adopts the prior art, and the model of the signal relay is G6S-2DC24. The input end of the output voltage adjustable circuit 1111 is connected to the first sub-output end of the first output end of the main control unit 10, and the output end of the output voltage adjustable circuit 1111 is connected to the fourth and ninth PIN pins of the signal relay; the fifth and eighth PIN pins of the signal relay are respectively connected to both ends of the coil of the solenoid valve 20 to be tested, the twelfth PIN pin is connected to the 24V power supply voltage, and the first PIN pin is connected to the output end of the switch circuit; the input end of the switch circuit is connected to the second sub-output end of the first output end of the main control unit 10.

[0045] As Figure 4 shown, the switch circuit includes a resistor R870, a resistor R866, a resistor R875, and an NPN transistor; the first end of the resistor R870 is the input end of the switch circuit, the second end of the resistor R870 is grounded through the resistor R875 and connected to the base of the NPN transistor, the emitter of the NPN transistor is grounded, and the collector of the NPN transistor is connected to the first PIN pin of the signal relay through the resistor R866.

[0046] Among them, the intake end of the air supply circuit 112 is detachably connected to an external air source, and the outlet end is detachably connected to the intake end of the solenoid valve 20 to be tested, for providing a test air pressure for the solenoid valve 20 to be tested. Specifically, the air supply circuit 112 includes a dryer, a pressure reducing valve, a stop valve, and an air storage tank connected in sequence, and further includes a second pressure acquisition unit connected to the air storage tank; the air storage tank is also connected to the intake end of the solenoid valve 20 to be tested, and the dryer is also connected to the external air source. Among them, the second pressure acquisition unit includes a second pressure sensor and a signal conditioning circuit. The second pressure sensor acquires the air pressure of the air storage tank as the intake end air pressure of the solenoid valve 20 to be tested, and after passing through the signal conditioning circuit, it is sent to an input end of the analog-to-digital conversion circuit 16, and then sent to the main control unit 10 by the analog-to-digital conversion circuit 16.

[0047] Among them, the first pressure acquisition unit 113 is respectively connected to the outlet end of the solenoid valve 20 to be tested and the first input end of the main control unit 10, for acquiring the outlet end air pressure of the solenoid valve 20 to be tested and outputting it to the main control unit 10, so that the main control unit 10 can analyze and obtain the excitation voltage and demagnetization voltage of the solenoid valve 20 to be tested according to the outlet end air pressure of the solenoid valve 20 to be tested and the first test voltage. Among them, the first pressure acquisition unit 113 includes a first pressure sensor and a signal conditioning circuit. The first pressure sensor is connected to the first input end of the analog-to-digital conversion circuit 16 through the signal conditioning circuit, thereby connecting to the first input end of the main control unit 10.

[0048] It is understandable that the first pressure acquisition unit 113 may not include a first pressure sensor. When using this solenoid valve detection device, a pressure sensor can be additionally connected through a corresponding interface for pressure detection and then input to a corresponding signal conditioning circuit.

[0049] As Figure 5 shown, in another embodiment, the first test unit 11 includes: a first test voltage unit 111 and a first voltage acquisition unit 114. It is used to test the excitation voltage and demagnetization voltage of the solenoid valve 20 to be tested by the current method.

[0050] The first voltage acquisition unit 114 is connected to the second input end of the main control unit 10 and the coil of the solenoid valve 20 to be tested, and is used to acquire the voltage across the coil of the solenoid valve 20 to be tested, so that the main control unit 10 can analyze the excitation voltage and demagnetization voltage according to the voltage across the coil. Among them, the first voltage acquisition unit 114 includes a voltage measuring device such as a current clamp or a multimeter and a signal conditioning circuit. The voltage measuring device is connected to the second input end of the analog-to-digital conversion circuit 16 through the signal conditioning circuit, and thus is connected to the main control unit 10.

[0051] It is understandable that the first voltage acquisition unit 114 may not include a voltage detection device. When using this solenoid valve detection device, a voltage measuring device can be additionally connected through a corresponding interface for voltage detection and then input to a corresponding signal conditioning circuit.

[0052] In another embodiment, the first test unit 11 includes a first test voltage unit 111, a gas supply circuit 112, a first pressure acquisition unit 113, and a first voltage acquisition unit 114. During use, the gas supply circuit 112 and the first pressure acquisition unit 113, or the first voltage acquisition unit 114, are selected according to actual needs to test the excitation voltage and demagnetization voltage of the solenoid valve 20 to be tested.

[0053] In this embodiment, the second test unit 12 is used to test the coil DC resistance value of the solenoid valve to be tested. As Figure 6 shown, it includes a constant current source I2 that provides a second test voltage for the solenoid valve 20 to be tested, resistors R1, R2, R3, R4, R5, and an amplifier U1. The first end of the coil of the solenoid valve to be tested is connected to the constant current source I2, the second end is connected to the first end of the resistor R5, and the second end of the resistor R5 is connected to the constant current source I2 and grounded; the non-inverting input end of the amplifier U1 is connected to the first end of the coil of the solenoid valve to be tested through the resistor R1 and grounded through the resistor R3, the inverting input end of the amplifier U1 is connected to the second end of the coil of the solenoid valve to be tested through the resistor R2, and the output end of the amplifier U1 is connected to the main control unit 10 and connected to the inverting input end of the amplifier U1 through the resistor R4.

[0054] Further, the second test unit 12 further includes a switch circuit for disconnecting or conducting the second test voltage supplied to the solenoid valve 20 to be tested and a signal relay connected to both ends of the coil of the solenoid valve 20 to be tested. The input end of the constant current source I2 is connected to the main control unit 10, and the output end is connected to the signal relay, and the second test voltage is provided for the solenoid valve 20 to be tested through the signal relay; the input end of the switch circuit is connected to the main control unit 10, and the output end is connected to the signal relay.

[0055] The second test unit 12 further includes a signal conditioning circuit. The output end of the amplifier U1 is connected to the input end of the analog-to-digital conversion circuit 16 through the signal conditioning circuit, and thus is connected to the main control unit 10.

[0056] In this embodiment, the third test unit 13 is used to test the connection state of the diode connected in parallel with the coil in the solenoid valve to be tested. As Figure 7 shown, it includes a third test voltage unit V1 for providing a third test voltage for the solenoid valve to be tested, a resistor R11, and a third voltage acquisition unit for acquiring the voltage across both ends of the coil R22; the coil R22 of the solenoid valve to be tested is connected in series with the resistor R11 across both ends of the third test voltage unit, and the third voltage acquisition unit is connected across both ends of the coil R22 of the solenoid valve to be tested.

[0057] If the voltage across both ends of the coil R22 acquired is equal to the voltage division value of the coil, it indicates that the polarity of the diode D1 is reverse-connected; if not, it indicates that the polarity of the diode D1 is forward-connected.

[0058]

[0059] where U 31 is the voltage division value of the coil, U 30 is the third test voltage, R 22 is the DC resistance value of the coil, and R 11 is the resistance value of the resistor R11.

[0060] Specifically, the third voltage acquisition unit includes a voltage measurement device such as a current clamp or a multimeter and a signal conditioning circuit. The voltage measurement device is connected to an input end of the analog-to-digital conversion circuit 16 through the signal conditioning circuit, and thus is connected to the main control unit 10. It can be understood that the third voltage acquisition unit may not include a voltage detection device, and when using this solenoid valve detection device, a voltage measurement device is additionally connected through a corresponding interface for voltage detection and then input to the corresponding signal conditioning circuit. In an alternative embodiment, the first voltage acquisition unit 114 may be used as the third voltage acquisition unit.

[0061] Further, the third test unit 13 further includes a signal conditioning circuit. The output end of the third voltage acquisition unit is connected to the input end of the analog-to-digital conversion circuit 16 through the signal conditioning circuit, and thus is connected to the main control unit 10.

[0062] The third test unit 13 further includes a switch circuit for disconnecting or conducting the third test voltage supplied to the solenoid valve 20 to be tested and a signal relay connected to both ends of the coil of the solenoid valve 20 to be tested. The input end of the third test voltage unit is connected to the main control unit 10, and the output end is connected to the signal relay, and the third test voltage is provided for the solenoid valve 20 to be tested through the signal relay; the input end of the switch circuit is connected to the main control unit 10, and the output end is connected to the signal relay.

[0063] In the above embodiment, each signal conditioning circuit filters and amplifies the corresponding collected data of the solenoid valve to be tested, and then converts it into a digital quantity through the analog-to-digital conversion circuit 16 and transmits it to the main control unit 10. As Figure 8 shown, a signal conditioning circuit includes resistors R626, R627, R632, R636, R640, R645, R646, R654, capacitors C234, C238, C242 and an operational amplifier U75 (model LM358); the VCC terminal of the operational amplifier is connected to the 15V positive power supply voltage and grounded through the capacitor C234, and the VEE terminal of the operational amplifier is connected to the 15V negative power supply voltage; the non-inverting input A terminal of the operational amplifier is grounded through the resistor R646 and connected to the first terminal of the resistor R627, the second terminal of the resistor R627 is connected to the first terminal of the resistor R626, and the second terminal of the resistor R626 is the input terminal AI4 of the signal conditioning circuit; the second terminal of the resistor R626 is grounded through the capacitor C238, and the first terminal of the resistor R626 is grounded through the resistor R645; the first terminal of the resistor R636 is connected between the common terminal of the resistor R626 and the resistor R645 and the second terminal of the resistor R627, and the second terminal of the resistor R636 is grounded through the resistor R654 and connected to the inverting input A terminal of the operational amplifier through the resistor R632; the output A terminal of the operational amplifier is grounded through the capacitor C242 and serves as the output terminal VB6 of the signal conditioning circuit and is connected to the analog-to-digital conversion circuit 16; the first terminal of the resistor R640 is connected between the resistor R632 and the inverting input A terminal of the operational amplifier, and the second terminal of the resistor R640 is connected between the output A terminal of the operational amplifier and the capacitor C242.

[0064] In another embodiment, the solenoid valve detection device further includes an integrated signal output port, and multiple test units are all connected to the integrated signal output port and connected to the solenoid valve 20 to be tested through the integrated signal output port. Specifically, each test unit is connected to the integrated signal output port through a corresponding signal relay. Only by connecting the integrated signal output port to the solenoid valve 20 to be tested once, the first test voltage, the second test voltage and the third test voltage can be respectively output to the solenoid valve 20 to be tested, which can greatly reduce the wiring complexity.

[0065] The solenoid valve detection device further includes a power supply unit 15 for supplying power to the main control unit 10, each test unit, and other units or circuits in the solenoid valve detection device. The power supply unit 15 includes a first power supply unit, a second power supply unit, and a switching unit.

[0066] Among them, the first power supply unit includes an adapter. The adapter is connected to an external 220V AC power supply, converts the 220V AC power supply into the required DC power supply voltage, and outputs it to each unit. The second power supply unit includes a battery unit. The battery unit uses a rechargeable battery pack. The second power supply unit is also connected to the first power supply unit, and the first power supply unit charges the second power supply unit.

[0067] The switching unit is used to switch between the first power supply unit and the second power supply unit for power supply. The switching unit uses a relay. The relay coil is connected to the 220V AC power supply, and the normally open contact of the relay is connected to the IO pin of the main control unit 10. When the external 220V AC power supply is powered on, the normally open contact of the relay closes; when the external 220V AC power supply is lost, the normally open contact of the relay opens. The IO pin of the main control unit 10 can determine whether there is an external 220V AC power supply by detecting the condition of the relay contact, thereby realizing the automatic switching between the battery unit and the 220V AC power supply for power supply.

[0068] The solenoid valve detection device further includes a box cover and a box body. One side of the box cover is connected to one side of the box body through a hinge, and there is a buckle between the other side of the box cover and the other side of the box body. The above-mentioned main control unit 10, multiple test units, integrated signal output port, power supply unit 15, and other units or circuits are all arranged in the box body. There is a handle on the box body, which can improve the portability of the solenoid valve detection device.

[0069] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A solenoid valve detection device for a nuclear power plant, characterized in that: The solenoid valve detection device comprises: a main control unit and a plurality of test units, wherein the plurality of test units comprises a first test unit; The first test unit comprises: a first test voltage unit connected to the first output terminal of the main control unit and the electromagnetic valve to be tested, and used for providing a first test voltage to the electromagnetic valve to be tested according to a first voltage adjustment signal output by the main control unit; The first testing unit further includes: The air inlet end is detachably connected to an external air source, and the air outlet end is detachably connected to the air inlet end of the solenoid valve to be tested, so as to provide an air supply circuit with a test air pressure for the solenoid valve to be tested; A first pressure acquisition unit connected to the air outlet of the solenoid valve to be tested and the first input end of the main control unit, used to collect the air pressure at the air outlet of the solenoid valve to be tested and output it to the main control unit, so that the main control unit can analyze the excitation voltage and demagnetization voltage of the solenoid valve to be tested according to the air pressure at the air outlet of the solenoid valve to be tested and the first test voltage; and / or, The first test unit also includes: A first voltage acquisition unit is connected to the second input terminal of the main control unit and the coil of the solenoid valve to be tested, and is used to collect the voltage across the coil of the solenoid valve to be tested, so that the main control unit can analyze the voltage across the coil to obtain the excitation voltage and the demagnetization voltage.

2. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The air supply circuit includes a dryer, a pressure reducing valve, a stop valve and an air cylinder connected in sequence, and also includes a second pressure collection unit connected to the air cylinder; the air cylinder is also connected to the air inlet end of the solenoid valve to be tested, and the dryer is also connected to the external air source.

3. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The solenoid valve detection device also includes an analog-to-digital conversion circuit, which is connected between the main control unit and the multiple test units and is used to perform analog-to-digital conversion on the signals transmitted by the test units and then transmit the signals to the main control unit.

4. The electromagnetic valve detection device for a nuclear power plant according to claim 3, characterized in that: The first pressure acquisition unit includes a first pressure sensor and a signal conditioning circuit, and the first pressure sensor is connected to the first input terminal of the analog-to-digital conversion circuit through the signal conditioning circuit; The first voltage acquisition unit includes a voltage measuring device and a signal conditioning circuit, and the voltage measuring device is connected to the second input terminal of the analog-to-digital conversion circuit through the signal conditioning circuit.

5. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The first test voltage unit comprises: an output voltage adjustable circuit for outputting a corresponding first test voltage according to the first voltage regulation signal, a switch circuit for disconnecting or connecting the first test voltage delivered to the electromagnetic valve to be tested according to a switch signal of the main control unit, and a signal relay for connecting two ends of the coil of the electromagnetic valve to be tested; The input end of the output voltage adjustable circuit is connected to the main control unit, and the output end is connected to the signal relay; the input end of the switch circuit is connected to the main control unit, and the output end is connected to the signal relay.

6. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The plurality of test units also include a second test unit for testing the DC resistance value of the coil of the solenoid valve to be tested, wherein the second test unit includes a constant current source for providing a second test voltage for the solenoid valve to be tested, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and an amplifier; The first end of the coil of the solenoid valve to be tested is connected to the constant current source, and the second end is connected to the first end of the resistor R5. The second end of the resistor R5 is connected to the constant current source and grounded. The in-phase input end of the amplifier is connected to the first end of the coil of the solenoid valve to be tested through the resistor R1 and grounded through the resistor R3. The inverting input end of the amplifier is connected to the second end of the coil of the solenoid valve to be tested through the resistor R2. The output end of the amplifier is connected to the main control unit and connected to the inverting input end of the amplifier through the resistor R4.

7. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The multiple test units also include a third test unit for testing the connection state of the diode connected in parallel with the coil in the electromagnetic valve to be tested, and the third test unit includes a third test voltage unit for providing a third test voltage for the electromagnetic valve to be tested, a resistor R11 and a third voltage acquisition unit; The coil of the electromagnetic valve to be tested and the resistor R11 are connected in series at both ends of the third test voltage unit, and the third voltage acquisition unit is connected to both ends of the coil of the electromagnetic valve to be tested.

8. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The solenoid valve detection device further comprises: a power supply unit for supplying power to the solenoid valve detection device; The power supply unit includes a first power supply unit, a second power supply unit and a switching unit, and the switching unit is used to switch the first power supply unit or the second power supply unit to supply power.

9. The electromagnetic valve detection device for a nuclear power plant according to claim 8, characterized in that: The first power supply unit includes an adapter, which is connected to an external 220V AC power supply; the second power supply unit includes a battery unit; the first power supply unit is also connected to the second power supply unit to charge the second power supply unit.

10. The electromagnetic valve detection device for a nuclear power plant according to claim 1, characterized in that: The solenoid valve detection device further comprises an integrated signal output port, the plurality of test units are all connected to the integrated signal output port, and the solenoid valve to be tested is connected via the integrated signal output port.

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