Electro-hydraulic remote control valve low-temperature performance test device and test method

Abstract

The invention relates to the technical field of valve test, and discloses an electro-hydraulic remote control valve low temperature performance test device, which comprises a low temperature performance test box and tested equipment, and is characterized in that the low temperature performance test box is internally provided with a refrigeration device, a low temperature sudden drop area, an icing test area, an air tightness test area and a test buffer area; the low-temperature performance test box provides an installation and debugging environment for each test area; the refrigeration device is arranged at the head end of the low-temperature performance test box, the low-temperature sudden drop area is adjacent to the refrigeration device, the icing test area is adjacent to the low-temperature sudden drop area, the air tightness test area is adjacent to the icing test area, and the test buffer area is adjacent to the air tightness test area. The low-temperature performance test device comprises various test areas including a low-temperature sudden drop expectation area, an icing test area, a confidentiality test area and a buffer test area, and parameters of the test areas can be adjusted and combined and split according to test requirements, so that the valve in a low-temperature environment can be tested in an omnibearing manner.

Description

Technical Field

[0001] The invention relates to the technical field of valve testing, and in particular to a low temperature performance testing device and a testing method for an electro-hydraulic remote-controlled valve. Background Art

[0002] The Arctic region is rich in resources and has important strategic value. As the navigation window of the Arctic route continues to extend, the polar equipment in service has to withstand harsh natural environmental factors, and equipment failure is very serious.

[0003] Low temperature has a certain impact on almost all base materials, especially on electro-hydraulic remote control valves. Low temperature can cause hardening and embrittlement of materials, seizure and interference of parts, reduced lubrication, and other problems, affecting the normal opening and closing of valves and causing navigation hazards. Therefore, it is particularly important to carry out low temperature tests, the purpose of which is to assess the adaptability of electro-hydraulic remote control valves to storage, operation, and disassembly and assembly operations under low temperature and icing conditions, and to gain a deep understanding of the impact of low temperature conditions on their working performance, safety, and integrity.

[0004] Based on this, it is necessary to provide a test device and test method that can verify the performance of electro-hydraulic remote-controlled valves at low temperatures to address the above-mentioned technical problems, so as to improve the independent research and development capabilities and reliability of my country's polar equipment. Summary of the invention

[0005] The technical problem to be solved by the present invention is the problem that the existing low temperature performance test methods for valves are imperfect.

[0006] In order to solve the above technical problems, the technical solution of the present invention is to provide a low temperature performance test device for an electro-hydraulic remote control valve, including a low temperature performance test box and a test device, wherein the low temperature performance test box is provided with a refrigeration device, a low temperature sudden drop area, an icing test area, an airtightness test area and a test buffer area, wherein:

[0007] The low temperature performance test chamber provides an installation and debugging environment for each test area;

[0008] The refrigeration device is installed at the head end of the low temperature performance test chamber, which is equipped with a cascade refrigeration system to provide the low temperature test environment temperature for the equipment under test;

[0009] The low temperature drop area is adjacent to the refrigeration device and is equipped with a movable axial flow fan for the low temperature drop test of the equipment under test;

[0010] The icing test area is adjacent to the low temperature sudden drop area, and is equipped with an ice accretion test device for low temperature icing tests of the equipment under test;

[0011] The air tightness test area is adjacent to the icing test area, and is equipped with an air tightness test device for low-temperature air tightness testing of the equipment under test;

[0012] The test buffer area is adjacent to the airtightness test area and is located at the end of the low-temperature performance test chamber. It is used for functional dimensional inspection of the test equipment after the test.

[0013] Optionally, a refrigeration air inlet and a refrigeration air return outlet are provided between the refrigeration device of the low-temperature performance test box and the low-temperature sudden drop area, and between the air tightness test area and the test buffer area, and temperature sensors and fences are provided on the refrigeration air inlet and the refrigeration return air outlet.

[0014] Optionally, the low-temperature drop area, icing test area and airtightness test area are provided with a low-temperature explosion-proof camera, a low-temperature explosion-proof lighting lamp and a data communication port; the low-temperature explosion-proof camera is provided with a heating device, and the data communication port is provided with a heat insulation plug.

[0015] Optionally, the low temperature performance test box is provided with an observation window made of transparent electric heating film hollow tempered glass, and the low temperature performance test box is provided with an insulation board on the outside.

[0016] Optionally, the ice accumulation test device includes an external icing device, an internal icing device, and a wind speed, wind direction, temperature and humidity collector. The external icing device is located above the internal icing device, and the two are separated by a partition. The temperature and humidity collector is located inside the external icing device and the internal icing device.

[0017] Optionally, the ice accumulation test device is provided with a spray device, the spray device includes a spray head, a spray stand, an air pipe and a water pipe, the spray stand is provided with a movable fixed bracket, the spray head is arranged on the fixed bracket and is respectively connected to the water pipe and the air pipe, and the spray device is provided with a flow meter and a pressure sensor.

[0018] Optionally, a water accumulation tray is provided in the ice accretion test area, a plurality of dew holes are provided on the water accumulation tray, and a water flow trough and a water droplet are provided on the bottom plate of the ice accretion test area.

[0019] Optionally, the air tightness test device includes a fixed stand, a fixed claw and a telescopic column. There are multiple telescopic columns, all of which are arranged on the fixed stand. The fixed claw is arranged at the upper end of the telescopic column and is used to clamp the test equipment. A water irrigation area is provided on the fixed stand.

[0020] A test method for a low temperature performance test device for an electro-hydraulic remote control valve.

[0021] The following steps are involved:

[0022] s100. Select the electro-hydraulic remote control valve sample as the test equipment, conduct appearance inspection and material inspection, and ensure that it meets the technical requirements and the technical data and certification documents are consistent;

[0023] s110. Check the insulation resistance between the power supply phase and the ground of the equipment under test and perform functional inspection;

[0024] s120. Conduct a low temperature drop test. Place the equipment under test in the low temperature drop area. Do not power on the equipment under test. Set the ambient temperature. When the temperature of the equipment under test drops to the test temperature, power on the equipment under test to check its function. The switch function of the equipment under test is normal and the feedback signal is correct.

[0025] s130. Conduct low temperature test. When the surface temperature of the equipment under test reaches the test temperature and maintains it for a certain period of time, power on to check the function of the equipment under test. The switch function of the equipment under test is normal and the feedback signal is correct.

[0026] s140. Conduct an external icing test. Place the equipment under test in an external icing device. When the temperature of the equipment under test reaches the test temperature, ice is accumulated on the equipment under test. When the ice thickness reaches the requirement, keep it for a certain period of time. After breaking the ice, power on the equipment under test to check its function. The switch function of the equipment under test is normal and the feedback signal is correct.

[0027] s150. Conduct an internal icing test. Place the equipment under test in the internal icing device. When the temperature of the equipment under test reaches the test temperature, ice is accumulated on the equipment under test. When the ice thickness reaches the requirement, keep it for a certain period of time. After breaking the ice, power on and conduct a functional check. The switch function is normal and the feedback signal is correct.

[0028] s160. Carry out an air tightness test. Place the equipment under test on a fixed stand in the air tightness test area. Adjust the valve of the equipment under test to the closed position. Fill the inlet pipe end of the equipment under test with water. Apply pressure from the inlet end to carry out a sealing test to meet the test pressure and test time requirements.

[0029] Optionally, in steps s100 to s160, if the current working performance of the device under test does not meet the requirements of the actual working performance requirements, it is determined that the performance of the device under test does not meet the requirements, and subsequent test steps are stopped.

[0030] In summary, the present invention has at least one of the following beneficial effects:

[0031] The low temperature performance test device of the present invention can simulate a temperature range of -70°C-80°C. It can not only simulate a low temperature environment, a normal temperature environment and a high temperature environment, but also simulate a sudden temperature drop and a high and low temperature change environment, thereby verifying the thermal expansion performance of the valve under low temperature.

[0032] The low-temperature performance test device of the present invention includes a variety of test areas. Different from the existing single low-temperature test box verification method, the present invention includes low-temperature sudden drop expectation, icing test area, confidentiality test area, buffer test area, and can adjust the test area parameters and combine and split them according to test requirements, so as to conduct comprehensive tests on valves in low-temperature environments.

[0033] The test method of the present invention can be used in combination according to the test requirements. For low temperature, it includes low temperature sudden drop and low temperature test, and for icing, it includes external icing and internal icing. Through a reasonable test combination sequence, the quality of the low temperature performance test of the valve is improved, thereby ensuring the good performance of the valve at low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a low temperature performance test device for an electro-hydraulic remote control valve of the present invention;

[0035] Figure 2 This is a schematic diagram of the icing test structure of the electro-hydraulic remote control valve of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the fixed bench for the air tightness test of the electro-hydraulic remote control valve of the present invention;

[0037] Figure 4 It is a schematic diagram of the test method flow of the present invention;

[0038] In the figure: 100, low temperature performance test chamber; 101, refrigeration air inlet; 102, refrigeration return air outlet; 103, low temperature explosion-proof camera; 104, low temperature explosion-proof lighting; 105, data communication port; 200, refrigeration device; 201, cascade refrigeration system; 300, low temperature drop area; 301, movable axial flow fan; 400, icing test area; 401, icing test device; 402, external icing device; 403, internal icing device; 404, wind speed and direction and temperature and humidity collector; 500, air tightness test area; 501, air tightness test device; 502, fixed stand; 503, fixed claw; 504, telescopic column; 505, water filling area; 600, test buffer area; 700, test equipment; 701, external icing area; 702, internal icing area; 703, connecting rod; 705, valve drive head. DETAILED DESCRIPTION

[0039] The following combination Figure 1-4 The present invention is described in further detail.

[0040] The present invention discloses a low temperature performance test device for an electro-hydraulic remote control valve. Figure 1, including a low temperature performance test box 100 and a test equipment 700, wherein the low temperature performance test box 100 is provided with a refrigeration device 200, a low temperature sudden drop area 300, an icing test area 400, an airtightness test area 500 and a test buffer area 600, wherein:

[0041] The low temperature performance test chamber 100 provides an installation and debugging environment for each test area, where various parameters can be set, the ambient temperature can be controlled, and the lighting, data recording and video recording functions can be turned on;

[0042] The refrigeration device 200 is arranged at the head end of the low temperature performance test box 100, and a cascade refrigeration system 201 is arranged therein, which is used to provide a low temperature test environment temperature for the test equipment 700, and the temperature range that can be simulated is -70℃~+80℃;

[0043] Specifically, the refrigeration device 200 also includes a refrigeration compressor, an evaporator, a condenser, a throttling device, a plate exchanger, and a control system, etc., which can automatically adjust the operating conditions of the refrigerator according to the test conditions. The cascade refrigeration system 201 is provided with safety protection devices, including compressor overheat protection, compressor overcurrent protection, compressor overpressure protection, condensing fan overheat protection, and three-phase power supply overvoltage, undervoltage, phase loss, phase protection, etc., to avoid accidents;

[0044] The low temperature drop area 300 is adjacent to the refrigeration device 200, and is provided with a movable axial flow fan 301 for the low temperature drop test of the test equipment 700;

[0045] Specifically, a wind speed and direction collector is arranged in front of the movable axial flow fan 301, and the movable axial flow fan 301 is connected with a control system for adjusting the ambient wind speed and accelerating the reduction of the valve surface temperature. Before the low temperature sudden drop area 300 is tested, a temperature drop calibration is required;

[0046] The icing test area 400 is adjacent to the low temperature sudden drop area 300, and is provided with an ice accretion test device 401 for performing a low temperature icing test on the test equipment 700;

[0047] Specifically, the ice accretion test device 401 includes an external ice accretion device 402, an internal ice accretion device 403, and a wind speed and direction and temperature and humidity collector 404. The external ice accretion device 402 is located above the internal ice accretion device 403, and the two are separated by a partition. The temperature and humidity collector 404 is located inside the external ice accretion device 402 and the internal ice accretion device 403. The ice accretion test device 401 is provided with a spray device, which includes a spray head, a spray stand, an air pipe and a water pipe. The spray stand is provided with a movable fixed bracket, and the spray head is arranged on the fixed bracket and is connected to the water pipe and the air pipe respectively. The number of nozzles can be installed and disassembled according to the number of test requirements, and is used to spray water mist to the test equipment 700 to generate ice accumulation. The spray device is provided with a flow meter and a pressure sensor for measuring the water supply flow and air supply pressure of the spray device. The spray stand is provided with a control console for controlling the water flow, spray size, water temperature and air pressure of the spray device. A water accumulation tray is provided in the ice accumulation test area 401, and a plurality of dew holes are provided on the water accumulation tray. A water flow trough and a drain are provided on the bottom plate of the ice accumulation test area 401 for drainage after the water spray test under certain temperature conditions.

[0048] The air tightness test area 500 is adjacent to the icing test area 400, and is provided with an air tightness test device 501 for low-temperature air tightness test of the test equipment 700;

[0049] Specifically, refer to Figure 3 The air tightness test device 501 includes a fixed stand 502, a fixed claw 503 and a telescopic column 504. A plurality of telescopic columns 504 are provided, all of which are arranged on the fixed stand 502. The fixed claw 503 is arranged at the upper end of the telescopic column 504, and is used to clamp and fix the test equipment 700. The air tightness test device 501 also includes an operating platform, and the operating platform can set the pressure required for different valves, so as to test the sealing performance of the valve under different pressures. A water filling area 505 is provided on the fixed stand 502;

[0050] The test buffer area 600 is adjacent to the air tightness test area 500 and is located at the end of the low temperature performance test chamber 100. It is used for functional dimension inspection of the test equipment 700 after the test. Various instruments and meters, such as vernier calipers, ammeters, spot temperature guns, mallets, etc., can be placed therein for functional testing of valves.

[0051] In a further embodiment, a refrigeration air inlet 101 and a refrigeration air return port 102 are provided between the refrigeration device 200 and the low temperature sudden drop area 300 of the low temperature performance test box 100, and between the air tightness test area 500 and the test buffer area 600. The refrigeration air inlet 101 and the refrigeration air return port 102 are both provided with a temperature sensor and a fence. The temperature sensor is used to monitor the inlet and return air temperatures, and the fence is used to prevent debris from entering.

[0052] A low-temperature explosion-proof camera 103, a low-temperature explosion-proof lighting lamp 104 and a data communication port 105 are provided in the low-temperature sudden drop area 300, the icing test area 400 and the air-tightness test area 500. The low-temperature explosion-proof camera 103 is provided with a heating device to prevent the camera from fogging in a low-temperature environment; the data communication port 105 is used to pass the control line of the valve and the connecting line of the sensor to the outside of the test box, and is provided with an insulation plug. When not in use, the insulation plug is installed to prevent cold loss. The low-temperature explosion-proof lighting lamp 104 is provided with multiple spare parts for replacement in case of damage during low-temperature experiments. An observation window is provided on the low-temperature performance test box 100, and the material is transparent electric heating film hollow tempered glass. The outside of the low-temperature performance test box 100 is provided with insulation measures, including but not limited to insulation boards, to prevent cold loss.

[0053] A test method for a low temperature performance test device for an electro-hydraulic remote control valve, referring to Figure 4 , including the following steps:

[0054] s100. Select the electro-hydraulic remote control valve sample as the test equipment 700, conduct appearance inspection and material inspection, and check whether it meets the technical requirements, and whether the technical data and certification documents are consistent. Check whether the main materials and components of the test equipment 700 can meet the low-temperature use requirements. Then select and arrange sensors according to the test valve. The sensors include valve surface temperature sensor, space temperature sensor, wind speed and direction sensor, and humidity sensor, etc. Among them, the valve surface temperature sensor is attached to the surface of the valve body, the space temperature sensor is placed in the space around the valve body, and the wind speed and direction sensor and humidity sensor are placed in front of the valve body;

[0055] Specifically, refer to Figure 2 The electro-hydraulic remote control valve sample includes an external icing area 701, an internal icing area 702, a connecting rod 703 and a valve driving head 705;

[0056] This step also includes test preparation, such as placing the test equipment 700, connecting the control system, tool preparation, etc., wherein the tools used include megohmmeter, clamp meter, multimeter, pressure gauge (tightness test), emergency hand pump, point thermometer (temperature measurement), vernier caliper, timer, flashlight, wooden hammer, cold-proof gloves and cold-proof clothing, etc.;

[0057] s110, check the insulation resistance between the power supply phase of the equipment under test 700 and the ground, and perform functional inspection;

[0058] Specifically, it also includes dimensional inspection and appearance inspection. The outer surface of the test equipment and pipeline components are visually inspected, and the surface paint film, color, nameplate, logo and part size of the main components of the test equipment are inspected. The dimensional inspection includes the measurement of the inner diameter of the valve body, the outer diameter of the valve plate, the inner diameter of the valve neck bearing, the outer diameter of the valve stem, the gear, the rack, the inner diameter of the liquid rod, the outer diameter of the piston and the oil temperature. The appearance inspection includes checking whether the appearance structure of the valve body is neat, whether there is rust and paint peeling, whether the internal structural parts are loose, whether the connecting wires are firm and reliable, whether the touch is flexible, etc. The insulation resistance inspection uses a 500V megohmmeter to measure the insulation resistance between the power supply phase of the test equipment and the ground;

[0059] s120, conduct a low temperature drop test, place the test device 700 in the low temperature drop area 300, do not power on the test device 700, set the ambient temperature, wait for the temperature of the test device 700 to drop to the test temperature, power on the test device 700 to perform a function check, and the switch function of the test device 700 is normal and the feedback signal is correct;

[0060] Specifically, the low temperature drop observation test of valve hydraulic oil samples, accessories and fittings should also be carried out. The hydraulic oil samples, accessories and fittings should be placed in the low temperature drop area to observe the state of the samples at low temperature;

[0061] s130, conduct low temperature test, wait until the surface temperature of the test equipment 700 reaches the test temperature, use a point thermometer to measure the valve body temperature, the valve body temperature must be consistent with the low temperature test temperature, maintain for a certain period of time, power on to check the function of the test equipment 700, the switch function of the test equipment 700 is normal, and the feedback signal is correct;

[0062] s140, conduct an external icing test, place the external icing area 701 of the test equipment 700 in the external icing device 402, wait for the temperature of the test equipment 700 to reach the test temperature, ice is accumulated on the external icing area 701 of the test equipment 700, and ice accumulation is maintained for a certain period of time after the ice thickness reaches the requirement. After breaking the ice, power is turned on to perform a function check on the test equipment 700, and the switch function of the test equipment 700 is normal and the feedback signal is correct;

[0063] Specifically, during the external icing test, the box temperature needs to be lowered to one of the test temperatures in the test conditions and maintained at this temperature. The valve body temperature needs to be consistent with the expected ambient temperature using a spot thermometer. When ice accumulates, the connecting rod 703 and the valve drive head 705 should have the same thickness of ice. When ice accumulates, the spray intensity and ice thickness corresponding to the valve icing test are obtained, and the water spraying amount and the intensity of the water mist spraying of the spraying device are adjusted according to the spray intensity and ice thickness.

[0064] s150, conduct an internal icing test, place the internal icing area 702 of the test equipment 700 in the internal icing device 403, wait for the temperature of the test equipment 700 to reach the test temperature, ice is accumulated in the internal icing area 702 of the test equipment 700, and ice accumulation is maintained for a certain period of time after the ice thickness reaches the requirement. After breaking the ice, power is turned on for functional inspection, and the switch function is normal and the feedback signal is correct;

[0065] Specifically, during the internal icing test, a point thermometer is used to measure the valve body temperature. The valve body temperature must be consistent with the expected ambient temperature. The ice accumulation areas of the internal icing test include at least between the shaft sleeve and the shaft and between the valve plate and the valve seat.

[0066] s160. Carry out an air tightness test. Place the test equipment 700 on the fixed stand 502 in the air tightness test area 500, and fix the test equipment 700 with the fixed claws 503 and the telescopic column 504. Adjust the valve of the test equipment 700 to the closed position, fill the inlet pipe end of the test equipment 700 with water, and seal the water filling area 505. Apply pressure from the inlet end to carry out a sealing test. The test pressure and test time requirements shall be met. The test pressure shall be not less than 1.1 times the rated working pressure of the test equipment 700, and the test time shall be not less than 120 seconds.

[0067] Specifically, it also includes thermal expansion effectiveness test. After the low-temperature test, the valve is placed at room temperature and it is ensured that the valve body and drive device are consistent with the ambient temperature. The valve is remotely opened and closed and manually switched on and off after connecting an emergency hand pump, and then a tightness test is performed. After the test, a dimensional inspection is carried out to collect dimensional changes of key components under temperature changes. At the same time, the main components of the test equipment are inspected for wear and damage, and the relevant data are recorded.

[0068] In a further embodiment, in steps s100 to s160, if the current working performance of the test equipment 700 does not meet the requirements of the actual working performance requirements, it is determined that the performance of the test equipment 700 does not meet the standards, and subsequent test steps are stopped. When conducting an external icing test, water not exceeding 2°C is used to freeze the outer surface of the test equipment 700 every 10 minutes until a thickness of at least 5 mm is reached. After the test, the test equipment 700 should be able to break the ice with a manual device and then perform remote control opening and closing actions and manual switching actions after connecting an emergency hand pump. After the icing test, the test equipment 700 is placed in a room temperature environment, and a point thermometer is used to measure the valve body temperature to ensure that it is consistent with the ambient temperature. Obvious water droplets can be wiped off by hand, and the insulation resistance is measured.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electro-hydraulic remote control valve low temperature performance test device, characterized in that: The invention comprises a low temperature performance test box (100) and a test device (700), wherein the low temperature performance test box (100) is provided with a refrigeration device (200), a low temperature sudden drop area (300), an icing test area (400), an air tightness test area (500) and a test buffer area (600), wherein: The low temperature performance test box (100) provides an installation and debugging environment for each test area; The refrigeration device (200) is arranged at the head end of the low-temperature performance test box (100), and is provided with a cascade refrigeration system (201) therein, for providing a low-temperature test environment temperature for the test equipment (700); The low temperature sudden drop area (300) is adjacent to the refrigeration device (200), and is provided with a movable axial flow fan (301) for performing a low temperature sudden drop test on the test equipment (700); The icing test area (400) is adjacent to the low temperature sudden drop area (300), and is provided with an ice accretion test device (401) for performing a low temperature icing test on the test equipment (700); The air tightness test area (500) is adjacent to the icing test area (400), and is provided with an air tightness test device (501) for performing a low-temperature air tightness test on the test equipment (700); The test buffer area (600) is adjacent to the airtightness test area (500) and is located at the end of the low temperature performance test box (100) and is used for functional dimension inspection of the test equipment (700) after the test.

2. The low temperature performance test device for electro-hydraulic remote control valve according to claim 1 is characterized in that: A refrigeration air inlet (101) and a refrigeration air return outlet (102) are provided between the refrigeration device (200) and the low temperature sudden drop area (300) of the low temperature performance test box (100), and between the air tightness test area (500) and the test buffer area (600), and the refrigeration air inlet (101) and the refrigeration air return outlet (102) are both provided with temperature sensors and fences.

3. The low temperature performance test device for electro-hydraulic remote control valve according to claim 1 is characterized in that: A low-temperature explosion-proof camera (103), a low-temperature explosion-proof lighting lamp (104) and a data communication port (105) are provided in the low-temperature sudden drop area (300), the icing test area (400) and the airtightness test area (500); a heating device is provided on the low-temperature explosion-proof camera (103), and a heat insulation plug is provided on the data communication port (105).

4. The low temperature performance test device for electro-hydraulic remote control valve according to claim 1 is characterized in that: The low temperature performance test box (100) is provided with an observation window made of transparent electric heating film hollow tempered glass, and a heat preservation board is arranged outside the low temperature performance test box (100).

5. The low temperature performance test device for electro-hydraulic remote control valve according to claim 1 is characterized in that: The ice accumulation test device (401) comprises an external icing device (402), an internal icing device (403) and a wind speed and direction and temperature and humidity collector (404); the external icing device (402) is located above the internal icing device (403), and the two are separated by a partition; the temperature and humidity collector (404) is located inside the external icing device (402) and the internal icing device (403).

6. The low temperature performance test device for electro-hydraulic remote control valve according to claim 5 is characterized in that: The ice accretion test device (401) is provided with a spray device, which comprises a spray head, a spray stand, an air pipe and a water pipe. The spray stand is provided with a movable fixed bracket, the spray head is arranged on the fixed bracket and is respectively connected to the water pipe and the air pipe. The spray device is provided with a flow meter and a pressure sensor.

7. The low temperature performance test device for electro-hydraulic remote control valve according to claim 5 is characterized in that: A water accumulation tray is provided in the ice accretion test area (401), and a plurality of dew holes are provided on the water accumulation tray. A water flow trough and a water droplet are provided on the bottom plate of the ice accretion test area (401).

8. The low temperature performance test device for electro-hydraulic remote control valve according to claim 1 is characterized in that: The air tightness test device (501) comprises a fixed stand (502), a fixed claw (503) and a telescopic column (504). A plurality of telescopic columns (504) are provided, all of which are arranged on the fixed stand (502). The fixed claw (503) is arranged at the upper end of the telescopic column (504) and is used to clamp the test equipment (700). A water irrigation area (505) is provided on the fixed stand (502).

9. A test method for a low temperature performance test device for an electro-hydraulic remote control valve, characterized in that: The following steps are involved: s100. Select the electro-hydraulic remote control valve sample as the test equipment (700), conduct appearance inspection and material inspection, and ensure that it meets the technical requirements and the technical data and certification documents are consistent; s110. Check the insulation resistance between the power supply phase and the ground of the equipment under test (700), and perform a functional check; s120, conducting a low temperature drop test, placing the device under test (700) in the low temperature drop area (300), not energizing the device under test (700), setting the ambient temperature, and after the temperature of the device under test (700) drops to the test temperature, energizing the device under test (700) to conduct a function check, and the switch function of the device under test (700) is normal and the feedback signal is correct; s130, conduct a low temperature test, wait for the surface temperature of the test equipment (700) to reach the test temperature, maintain it for a certain period of time, and then power on to conduct a function check on the test equipment (700). The switch function of the test equipment (700) is normal and the feedback signal is correct; s140, conducting an external icing test, placing the test equipment (700) in the external icing device (402), and accumulating ice on the test equipment (700) until the temperature of the test equipment (700) reaches the test temperature. When the ice accumulation thickness reaches the requirement and is maintained for a certain period of time, the test equipment (700) is powered on to perform a function check after the ice is broken. The switch function of the test equipment (700) is normal and the feedback signal is correct; s150, conducting an internal icing test, placing the test equipment (700) in the internal icing device (403), and accumulating ice on the test equipment (700) until the temperature of the test equipment (700) reaches the test temperature. When the ice accumulation thickness reaches the requirement, the test equipment (700) is kept for a certain period of time, and after breaking the ice, the equipment is powered on for a functional check to ensure that the switch function is normal and the feedback signal is correct; s160. Perform an air tightness test. Place the test equipment (700) on a fixed stand (502) in the air tightness test area (500). Adjust the valve of the test equipment (700) to a closed position. Fill the inlet pipe end of the test equipment (700) with water. Apply pressure from the inlet end to perform a air tightness test to meet the test pressure and test time requirements.

10. The low temperature performance test device for an electro-hydraulic remote control valve according to claim 9, characterized in that: In steps s100 to s160, if the current working performance of the device under test (700) does not meet the requirements of the actual working performance requirements, it is determined that the performance of the device under test (700) does not meet the requirements, and subsequent test steps are stopped.

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