Proportional electromagnetic valve off-line detection system for hydraulic coupler of nuclear power plant

Abstract

The invention discloses a proportional electromagnetic valve off-line detection system for a hydraulic coupler of a nuclear power plant. The proportional electromagnetic valve off-line detection system comprises an oil supply mechanism, a proportional electromagnetic valve, a scoop tube executing mechanism and an electric control box, the spoon tube executing mechanism comprises an oil cylinder and a spoon tube assembly; the spoon tube assembly comprises a spoon tube and a piston, and the piston defines an inner cavity of the oil cylinder into a piston upper cavity and a piston lower cavity; a first valve port of the proportional electromagnetic valve is connected and communicated with the piston upper chamber, and a second valve port of the proportional electromagnetic valve is connected and communicated with the piston lower chamber; the pressure detection mechanism comprises a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged at the first valve port, and the second pressure sensor is arranged at the second valve port; and a data acquisition module is arranged in the electric control box and is connected with the proportional electromagnetic valve, the first pressure sensor and the second pressure sensor. The device can be used for detecting and testing the proportional electromagnetic valve for the hydraulic coupler of the nuclear power plant, and is relatively simple in structure, low in manufacturing cost and good in practicability.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to an offline detection system for proportional solenoid valves used in hydraulic couplings of nuclear power plants. Background Technology

[0002] Domestic and international thermal power plants and nuclear power plants widely use RKM-type hydraulic couplings manufactured by a foreign company to regulate the operating speed of their electric feedwater pumps. The RKM-type hydraulic coupling uses a proportional solenoid valve to drive its speed regulating mechanism, thus achieving speed regulation. Therefore, this proportional solenoid valve is a key speed-regulating power component of the RKM-type hydraulic coupling. It is necessary to test the function and control accuracy of the proportional solenoid valve used in the RKM-type hydraulic coupling; however, currently, there is no relevant testing equipment or system for testing proportional solenoid valves. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide an offline testing system for proportional solenoid valves used in hydraulic couplings in nuclear power plants, addressing the lack of testing equipment or systems for testing proportional solenoid valves in related technologies.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct an offline detection system for a proportional solenoid valve for a hydraulic coupling in a nuclear power plant, including an oil supply mechanism, a proportional solenoid valve, a spoon tube actuator, and an electrical control box; The oil supply mechanism includes an oil tank and an oil delivery assembly. The oil tank is connected to the proportional solenoid valve through the oil delivery assembly. The proportional solenoid valve and the scoop tube actuator are mounted on the upper surface of the oil tank. The spoon tube actuator includes a hydraulic cylinder and a spoon tube assembly. The hydraulic cylinder includes a cylinder body, an upper end cover, and a lower end cover. The upper end cover is connected to the upper end of the cylinder body, and the lower end cover is connected to the lower end of the cylinder body. The spoon tube assembly includes a spoon tube and a piston disposed on the spoon tube. The piston defines an upper piston chamber and a lower piston chamber within the inner cavity of the hydraulic cylinder. The upper end of the spoon tube passes through the upper end cover, and the lower end of the spoon tube passes through the lower end cover. The first valve port of the proportional solenoid valve is connected and communicates with the upper chamber of the piston, and the second valve port of the proportional solenoid valve is connected and communicates with the lower chamber of the piston. The offline detection system for proportional solenoid valves used in hydraulic couplings of nuclear power plants also includes a pressure detection mechanism, which includes a first pressure sensor and a second pressure sensor; the first pressure sensor is located at the first valve port, and the second pressure sensor is located at the second valve port. The electrical control box is equipped with a data acquisition module, which is connected to the proportional solenoid valve, the first pressure sensor, and the second pressure sensor.

[0005] In some embodiments, the offline detection system for proportional solenoid valves used in nuclear power plant hydraulic couplings further includes a position measuring mechanism; the position measuring mechanism includes a connecting sleeve, a connecting plate, a support frame, a guide cylinder, and a position measuring sensor; the position measuring sensor is connected to the data acquisition module; The connecting sleeve is used to fit over the upper end of the spoon tube. One end of the connecting plate is connected to the connecting sleeve. The second end of the connecting plate is provided with a guide hole. A magnetic ring is provided around the circumference of the guide hole. The support frame is mounted on the upper end cover and is spaced apart from the spoon tube. The upper end of the support frame is provided with a mounting plate. The mounting plate is parallel to the upper end cover. The guide cylinder is mounted on the upper end cover and is located on the lower surface of the mounting plate. The position measuring sensor is mounted on the mounting plate. The probe of the position measuring sensor passes through the magnetic ring, and the lower end of the probe of the position measuring sensor is inserted into the guide cylinder.

[0006] In some embodiments, the oil delivery assembly includes an oil pump, an oil suction pipe, an oil outlet pipe, a tee fitting, an overflow pipe, an overflow valve, an oil supply pipe, and an oil return pipe, wherein the tee fitting has a first interface, a second interface, and a third interface; The oil pump is located on the circumferential side wall of the oil tank. The first end of the oil suction pipe is installed inside the oil tank, and the second end of the oil suction pipe is connected to the oil pump. One end of the oil outlet pipe is connected to the oil pump, and the second end of the oil outlet pipe is connected to the first interface. The first end of the overflow pipe is connected to the second interface, and the second end of the overflow pipe is connected to the oil tank and communicates with the inner cavity of the oil tank. The overflow valve is installed on the overflow pipe. The first end of the oil supply pipe is connected to the third interface, and the second end of the oil supply pipe is connected to the third valve port of the proportional solenoid valve. The oil return pipe is connected to the fourth valve port of the proportional solenoid valve, and the second end of the oil return pipe is connected to the oil tank and communicates with the inner cavity of the oil tank.

[0007] In some embodiments, the pressure detection mechanism includes a third pressure sensor disposed at the third valve port; the third pressure sensor is connected to the data acquisition module.

[0008] In some embodiments, the oil outlet pipe is equipped with a filter.

[0009] In some embodiments, the oil supply pipe is equipped with a flow meter.

[0010] In some embodiments, the oil tank is equipped with a level gauge.

[0011] In some embodiments, the fuel tank is also equipped with a temperature sensor.

[0012] In some embodiments, the bottom of the fuel tank is provided with a plurality of rollers, and / or the bottom of the fuel tank is provided with a plurality of support pads.

[0013] In some embodiments, the offline detection system for proportional solenoid valves of hydraulic couplings in nuclear power plants further includes a host computer connected to the data acquisition module.

[0014] The implementation of this invention has the following beneficial effects: the structure of the offline testing system for proportional solenoid valves used in hydraulic couplings of nuclear power plants can be used for testing and inspection of proportional solenoid valves used in hydraulic couplings of nuclear power plants. The structure of the offline testing system for proportional solenoid valves used in hydraulic couplings of nuclear power plants is relatively simple, the manufacturing cost is low, and the practicality is good. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1 This is a simplified diagram of an offline detection system for a proportional solenoid valve used in a hydraulic coupling in a nuclear power plant, according to some embodiments of the present invention. Figure 2 This is one of the structural schematic diagrams of an offline detection system for a proportional solenoid valve used in a hydraulic coupling in a nuclear power plant, according to some embodiments of the present invention; Figure 3 This is a second schematic diagram of the structure of the offline detection system for the proportional solenoid valve of the hydraulic coupling in a nuclear power plant, according to some embodiments of the present invention. Figure 4 This is the third schematic diagram of the offline detection system for proportional solenoid valves used in hydraulic couplings of nuclear power plants in some embodiments of the present invention; Figure 5 This is a partial structural schematic diagram of an offline detection system for a proportional solenoid valve used in a hydraulic coupling in a nuclear power plant, as described in some embodiments of the present invention. Figure 6 This is a cross-sectional view of an offline detection system for a proportional solenoid valve used in a hydraulic coupling in a nuclear power plant, according to some embodiments of the present invention. Detailed Implementation

[0016] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0017] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0018] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0019] See Figures 1 to 6 This invention discloses an offline testing system for proportional solenoid valves used in hydraulic couplings of nuclear power plants. It can be used for testing proportional solenoid valves (i.e., proportional solenoid valve 20 of this application) used in hydraulic couplings of nuclear power plants. The offline testing system for proportional solenoid valves used in hydraulic couplings of nuclear power plants has a relatively simple structure, low manufacturing cost, and good practicality.

[0020] See Figures 1 to 6The offline detection system for the proportional solenoid valve of the hydraulic coupling in the nuclear power plant includes an oil supply mechanism 10, a proportional solenoid valve 20, a spoon tube actuator 30, and an electrical control box 40.

[0021] The oil supply mechanism 10 includes an oil tank 11 and an oil delivery assembly. The oil tank is connected to the proportional solenoid valve 20 through the oil delivery assembly. The proportional solenoid valve 20 and the scoop tube actuator 30 are mounted on the upper surface of the oil tank.

[0022] The spoon tube actuator 30 includes a hydraulic cylinder 31 and a spoon tube assembly 32. The hydraulic cylinder 31 includes a cylinder body 311, an upper end cover 312 and a lower end cover 313. The upper end cover 312 is connected to the upper end of the cylinder body 311, and the lower end cover 313 is connected to the lower end of the cylinder body 311. The lower end cover 313 is connected to the upper surface of the oil tank 11. The upper end cover 312 and the lower end cover 313 can be fixed by a screw.

[0023] The spoon tube assembly 32 includes a spoon tube 321 and a piston disposed on the spoon tube 321. The piston defines the inner cavity of the oil cylinder 31 into an upper piston chamber 31a and a lower piston chamber 31b. The upper end of the spoon tube 321 passes through the upper end cover 312, and the lower end of the spoon tube 321 passes through the lower end cover 313. The lower end of the spoon tube 321 can extend into the oil tank 11. The upper end cover 312 may be provided with a first through cavity, and the lower end cover 313 may be provided with a second through cavity. A spoon tube sleeve 33 fitted around the outer periphery of the spoon tube 321 may be provided in the first through cavity and / or the second through cavity.

[0024] The first valve port of the proportional solenoid valve 20 is connected and communicates with the upper chamber 31a of the piston, and the second valve port of the proportional solenoid valve 20 is connected and communicates with the lower chamber 31b of the piston. The upper end cover 312 may be provided with a first oil supply channel communicating with the upper chamber 31a of the piston, and the lower end cover 313 may be provided with a second oil supply channel communicating with the lower chamber 31b of the piston. The first valve port is connected and communicates with the first oil supply channel, and the second valve port is connected and communicates with the second oil supply channel, for example, through a connecting pipe.

[0025] The offline detection system for the proportional solenoid valve of the hydraulic coupling in the nuclear power plant also includes a pressure detection mechanism 50, which includes a first pressure sensor 51 and a second pressure sensor 52; the first pressure sensor 51 is located at the first valve port, and the second pressure sensor 52 is located at the second valve port.

[0026] The electrical control box 40 can be installed on the side wall of the oil tank 11. The electrical control box 40 is equipped with a data acquisition module, which is connected to the proportional solenoid valve 20, the first pressure sensor 51, and the second pressure sensor 52. The electrical control box 40 may also be equipped with a power supply module, which is connected to the data acquisition module and can also be connected to the proportional solenoid valve 20 to provide power to the proportional solenoid valve 20.

[0027] The data acquisition module can send control signals to the proportional solenoid valve 20 to control the operation of the proportional solenoid valve 20. The data acquisition module can also acquire data from the first pressure sensor 51 and the second pressure sensor 52.

[0028] See Figures 1 to 6 For details, please refer to Figure 3 and Figure 6 In some embodiments, the offline detection system for the proportional solenoid valve of the hydraulic coupling in the nuclear power plant also includes a position measuring mechanism 60, which can measure the position information of the movement of the scoop tube 321; the position measuring mechanism 60 includes a connecting sleeve 61, a connecting plate 62, a support frame 63, a guide cylinder 64, and a position measuring sensor 65; the position measuring sensor 65 is connected to the data acquisition module.

[0029] The connecting sleeve 61 is used to fit over the upper end of the spoon tube 321. One end of the connecting plate 62 is connected to the connecting sleeve 61. The second end of the connecting plate 62 is provided with a guide hole 621. A magnetic ring (not shown) is provided around the circumference of the guide hole 621. The support frame 63 is provided on the upper end cover 312 and is spaced apart from the spoon tube 321. The upper end of the support frame 63 is provided with a mounting plate 631. The mounting plate 631 is parallel to the upper end cover 312. The guide cylinder 64 is installed on the upper end cover 312 and is located on the lower surface of the mounting plate 631. The position measuring sensor 65 is installed on the mounting plate 631. The probe 651 of the position measuring sensor 65 passes through the magnetic ring, and the lower end of the probe 651 of the position measuring sensor 65 is inserted into the guide cylinder 64. The position measurement sensor 65 may be a magnetostrictive sensor, preferably a Balluff position sensor. The signal type of the position measurement sensor 65 is 4-20mA.

[0030] See Figures 1 to 6 In some embodiments, the oil delivery assembly includes an oil pump 12, an oil suction pipe 13, an oil outlet pipe 14, a tee pipe joint 15, an overflow pipe 16, an overflow valve 17, an oil supply pipe 18, and an oil return pipe 19. The tee pipe joint 15 has a first interface, a second interface, and a third interface.

[0031] The oil pump 12 is located on the circumferential side wall of the oil tank 11. The first end of the oil suction pipe 13 is installed inside the oil tank 11, and the second end of the oil suction pipe 13 is connected to the oil pump 12. One end of the oil outlet pipe 14 is connected to the oil pump 12, and the second end of the oil outlet pipe 14 is connected to the first interface. The first end of the overflow pipe 16 is connected to the second interface, and the second end of the overflow pipe 16 is connected to the oil tank 11 and communicates with the inner cavity of the oil tank 11. The overflow valve 17 is installed on the overflow pipe 16. The first end of the oil supply pipe 18 is connected to the third interface, and the second end of the oil supply pipe 18 is connected to the third valve port of the proportional solenoid valve 20. The return pipe 19 is connected to the fourth valve port of the proportional solenoid valve 20, and the second end of the return pipe 19 is connected to the oil tank 11 and communicates with the inner cavity of the oil tank 11.

[0032] See Figures 1 to 6 In some embodiments, the pressure detection mechanism 50 includes a third pressure sensor 53, which is located at the third valve port; the third pressure sensor 53 is connected to the data acquisition module. The signal type of the first pressure sensor 51, the second pressure sensor 52, and the third pressure sensor 53 is 4-20mA, and the range is 0-1MPa.

[0033] See Figures 1 to 6 In some embodiments, the oil outlet pipe 14 is equipped with a filter 110. The filter 110 may be a Y-type filter with a filtration accuracy of 25 μm. Of course, other models of the filter 110 may also be selected according to actual needs, and no specific limitation is made here.

[0034] See Figures 1 to 6 In some embodiments, the oil supply pipe 18 is equipped with a flow meter 111 to detect the flow rate in the pipe. The flow meter 111 is connected to the data acquisition module.

[0035] See Figures 1 to 6 In some embodiments, the oil tank 11 is equipped with a level gauge 112, which may be located on the outer side of the oil tank 11, and the high and low position probes of the level gauge 112 are located inside the oil tank 11. The level gauge 112 is connected to the data acquisition module.

[0036] See Figures 1 to 6 In some embodiments, the oil tank 11 is also equipped with a temperature sensor 113. The temperature sensor 113 is connected to the data acquisition module. The temperature sensor 113 can be used to detect the temperature of the oil. The temperature sensor 113 is installed on the top cover of the oil tank 11, and the probe of the temperature sensor 113 extends into the oil tank 11. The temperature sensor 113 can be a PT100 bimetallic thermometer. Of course, other models of the temperature sensor 113 can also be selected according to actual needs, and no specific limitation is made here.

[0037] See Figures 1 to 6 In some embodiments, the overflow valve 17 may be a stainless steel needle valve, which can enable fine adjustment of the oil pressure.

[0038] like Figure 4 As shown, in some embodiments, the outer circumferential wall of the oil tank 11 is provided with two mounting plates extending along the height direction; the outer wall of the oil pump 12 is provided with a fixing plate, which is detachably connected and fixed to the mounting plate. The oil pump 12 may be provided with two fixing plates, which may be connected and fixed to the mounting plate by bolts or screws.

[0039] See Figures 1 to 6 In some embodiments, the bottom of the oil tank 11 is provided with a plurality of rollers 114, and / or the bottom of the oil tank 11 is provided with a plurality of support pads 115. The rollers 114 facilitate the movement of the oil tank 11. The rollers 114 may be omnidirectional wheels with braking function. Of course, the number and position of the rollers 114 can be selected according to actual needs, and are not specifically limited here. The support pads 115 may be height-adjustable support pads to facilitate fixing in the experimental area. Of course, in some embodiments, the support pads 115 may not be provided.

[0040] In some embodiments, the suction pipe 13, the outlet pipe 14, the overflow pipe 16, the supply pipe 18, and the return pipe 19 are all made of stainless steel, such as 304 or 316L stainless steel. Using stainless steel pipes can improve the service life of the entire pipeline and is suitable for the environment of coastal nuclear power plants.

[0041] In some embodiments, the oil pump 12 is a screw pump with its own motor. The oil pump 12 has a rated pressure of 5 bar, a flow rate of 43.1 L / min, a shaft power of 0.6 kW, and a motor power of 0.75 kW at a speed of 1450 rpm. It can provide a pressure of 3.5 bar or higher, and this pressure can be adjusted, for example, by controlling the motor speed or output power to adjust the pressure. Of course, the appropriate type of oil pump 12 can be selected according to actual needs; no specific limitation is made here.

[0042] In some embodiments, the fuel tank 11 may also be equipped with an air filter. The bottom of the fuel tank 11 may be provided with a discharge port, which may be equipped with a control valve.

[0043] In some embodiments, the offline detection system for proportional solenoid valves of hydraulic couplings in nuclear power plants further includes a host computer connected to the data acquisition module. The host computer may be, but is not limited to, a portable laptop computer.

[0044] In some embodiments, the data acquisition module can output two acquisition frequencies to the proportional solenoid valve 20: 10Hz and 1kHz. The 10Hz frequency can be used to acquire relative data such as the position of the scoop tube, control signal, time, flow rate, and pressure during the normal running-in process of the test device. The 1kHz frequency can be used to acquire transient changes in parameters such as the actual current of the proportional solenoid valve 20 and the flow rate and pressure of the medium. Since the response frequency of the proportional solenoid valve is approximately 20ms, a high-frequency acquisition function is required to measure the changes in flow rate and pressure corresponding to the movement of the solenoid valve body. In some embodiments, the data acquisition module may be equipped with components such as a current sensor.

[0045] The input control signal of the proportional solenoid valve 20 is 4-20mA, and the feedback signal of the proportional solenoid valve 20 is also 4-20mA.

[0046] Preferably, the data acquisition module can be an NI module motherboard, cDAQ-9185, and the NI module motherboard can be equipped with a current output module NI-9265 and a current input module NI-9253.

[0047] In some embodiments, the component structural dimensions of the proportional solenoid valve 20 and the scoop tube actuator 30 can be set according to the component structural dimensions of the actual RKM type hydraulic coupling (such as the R17K450M type hydraulic coupling). Specifically, in order to accurately reflect the actual working state of the proportional solenoid valve 20, the test piece of the scoop tube actuator 30 used in the offline testing system for the proportional solenoid valve of the nuclear power plant hydraulic coupling is designed as a 1:1 replica of the scoop tube actuator of the RKM type hydraulic coupling product, ensuring that the working chamber volume and scoop tube stroke are the same as the actual product.

[0048] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A kind of nuclear power plant hydraulic coupler with proportional electromagnetic valve off-line detection system, it is characterized in that, The oil supply mechanism (10), the proportional electromagnetic valve (20), the spoon pipe actuator (30) and the electric control box (40) are included. The oil supply mechanism (10) includes an oil tank (11) and an oil delivery assembly, the oil tank is connected with the proportional electromagnetic valve (20) through the oil delivery assembly; the proportional electromagnetic valve (20) and the spoon pipe actuator (30) are installed on the upper surface of the oil tank. The spoon pipe actuator (30) includes an oil cylinder (31) and a spoon pipe assembly (32), the oil cylinder (31) includes a cylinder body (311), an upper end cover (312) and a lower end cover (313), the upper end cover (312) is connected with the upper end of the cylinder body (311), and the lower end cover (313) is connected with the lower end of the cylinder body (311); the spoon pipe assembly (32) includes a spoon pipe (321) and a piston arranged on the spoon pipe (321), the piston divides the inner cavity of the oil cylinder (31) into an upper piston chamber (31a) and a lower piston chamber (31b), the upper end of the spoon pipe (321) penetrates through the upper end cover (312), and the lower end of the spoon pipe (321) penetrates through the lower end cover (313). The first valve port of the proportional electromagnetic valve (20) is connected and communicated with the upper piston chamber (31a), and the second valve port of the proportional electromagnetic valve (20) is connected and communicated with the lower piston chamber (31b). The proportional electromagnetic valve offline detection system for the nuclear power plant hydraulic coupler further includes a pressure detection mechanism (50), the pressure detection mechanism (50) includes a first pressure sensor (51) and a second pressure sensor (52), the first pressure sensor (51) is arranged at the first valve port, and the second pressure sensor (52) is arranged at the second valve port. The electric control box (40) is provided with a data acquisition module, and the data acquisition module is connected with the proportional electromagnetic valve (20), the first pressure sensor (51) and the second pressure sensor (52).

2. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 1, characterized in that, The proportional electromagnetic valve offline detection system for the nuclear power plant hydraulic coupler further includes a position measurement mechanism (60), the position measurement mechanism (60) includes a connecting sleeve (61), a connecting plate (62), a support frame (63), a guide cylinder (64) and a position measurement sensor (65), and the position measurement sensor (65) is connected with the data acquisition module. The connecting sleeve (61) is arranged on the upper end of the spoon tube (321), one end of the connecting plate (62) is connected with the connecting sleeve (61), the second end of the connecting plate (62) is provided with a guide hole (621), a magnetic ring is arranged on the circumferential surface of the guide hole (621), the support frame (63) is arranged on the upper end cover (312), and the support frame (63) is arranged in a spaced mode with the spoon tube (321); the upper end of the support frame (63) is provided with a mounting plate (631), the mounting plate (631) is arranged in parallel with the upper end cover (312), the guide cylinder (64) is mounted on the upper end cover (312), and the guide cylinder (64) is located on the lower surface of the mounting plate (631); the position measuring sensor (65) is mounted on the mounting plate (631), the probe rod (651) of the position measuring sensor (65) penetrates through the magnetic ring, and the lower end of the probe rod (651) of the position measuring sensor (65) is inserted into the guide cylinder (64).

3. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 1, characterized in that, The oil delivery assembly comprises an oil pump (12), an oil suction pipe (13), an oil outlet pipe (14), a three-way pipe joint (15), an overflow pipe (16), an overflow valve (17), an oil supply pipe (18) and an oil return pipe (19), and the three-way pipe joint (15) has a first interface, a second interface and a third interface; The oil pump (12) is arranged on the circumferential side wall of the oil tank (11), the first end of the oil suction pipe (13) is mounted in the oil tank (11), the second end of the oil suction pipe (13) is connected with the oil pump (12), one end of the oil outlet pipe (14) is connected with the oil pump (12), the second end of the oil outlet pipe (14) is connected with the first interface, the first end of the overflow pipe (16) is connected with the second interface, the second end of the overflow pipe (16) is connected with the oil tank (11) and communicates with the inner cavity of the oil tank (11), and the overflow valve (17) is mounted on the overflow pipe (16); the first end of the oil supply pipe (18) is connected with the third interface, the second end of the oil supply pipe (18) is connected with the third valve port of the proportional electromagnetic valve (20), the oil return pipe (19) is connected with the fourth valve port of the proportional electromagnetic valve (20), and the second end of the oil return pipe (19) is connected with the oil tank (11) and communicates with the inner cavity of the oil tank (11).

4. The nuclear power plant hydraulic coupler proportional solenoid valve off-line test system according to claim 3, characterized by, The pressure detection mechanism (50) comprises a third pressure sensor (53), and the third pressure sensor (53) is arranged on the third valve port; the third pressure sensor (53) is connected with the data acquisition module.

5. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 3, characterized in that, The oil outlet pipe (14) is provided with a filter (110).

6. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 3, characterized in that, The oil supply pipe (18) is provided with a flowmeter (111).

7. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 3, characterized in that, The oil tank (11) is provided with a liquid level meter (112).

8. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 3, characterized in that, The oil tank (11) is also provided with a temperature sensor (113).

9. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to claim 3, characterized in that, The bottom of the oil tank (11) is provided with a plurality of rollers (114), and / or the bottom of the oil tank (11) is provided with a plurality of support foot pads (115).

10. The off-line testing system for proportional solenoid valves for hydraulic couplings of nuclear power plants according to any of claims 1 to 9, characterized in that, The off-line detection system for the proportional electromagnetic valve of the hydraulic coupling of the nuclear power plant further comprises a host computer connected with the data acquisition module.

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