A testing device for a hydraulic winch control valve

Abstract

This invention discloses a testing device for a hydraulic winch control valve, comprising an oil supply tank and a simulated load module. The oil supply tank is connected to one end of an inlet oil circuit and one end of a return oil circuit. The other end of the inlet oil circuit is connected to the inlet port of the control valve under test, located in the test area. An oil supply module for circulating hydraulic oil is installed on the inlet oil circuit. The simulated load module has a first load port and a second load port, which are respectively connected to the control oil circuit of the control valve under test. A throttle valve is installed within the simulated load module, with its two ends connected to the first and second load ports via oil circuits. The other end of the return oil circuit is connected to the return port of the control valve under test. The purpose of this invention is to provide a small-sized testing device capable of simulating various conditions for detecting feedback from a hydraulic winch control valve.

Description

Technical Field

[0001] This invention relates to the production of hydraulic winches, and more particularly to a testing device for a hydraulic winch control valve. Background Technology

[0002] In high-performance applications such as roads, fire fighting, road rescue, and industrial and commercial towing landings, hydraulic winches are required. Hydraulic winches use the vehicle's power / power steering system as their power source, with a power steering pump providing the source power. The advantages of hydraulic winches are that they are easy to install, the external fixing parts are basically universal, and they can adapt to a variety of different working conditions.

[0003] The control valve is an important component of a hydraulic winch. It is used to control the hydraulic winch to switch between different working states such as traction, slippage, and stop control. It is a component that is related to the quality of the hydraulic winch. Therefore, after the control valve is manufactured, it needs to be tested to ensure its quality before leaving the factory.

[0004] Traditional testing devices connect the control valve's oil circuit to a hydraulic cylinder or motor, with the hydraulic cylinder or motor acting as the load on the control valve. Changing the output power of the hydraulic cylinder or motor simulates different operating conditions of the control valve. This type of testing device has the following problems: 1. Since hydraulic winches actually face many and complex operating conditions, simply changing the output power of the hydraulic cylinder or motor cannot accurately simulate all the operating conditions faced by the control valve. The control valve may be defective and fail to function under specific conditions. 2. Hydraulic cylinders or motors cannot simulate changes in other parameters (such as oil pressure, oil flow, etc.), and therefore cannot detect the control valve's feedback when these parameters change. 3. Using hydraulic cylinders or motors increases the size and maintenance cost of the testing device, thus increasing the product cost. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a small-sized testing device that can simulate the feedback of hydraulic winch control valves under various conditions.

[0006] Technical Solution: The present invention provides a testing device for a hydraulic winch control valve, comprising an oil supply tank and a simulated load module. The oil supply tank is connected to one end of an inlet oil circuit and one end of a return oil circuit. The other end of the inlet oil circuit is connected to the inlet of the control valve under test, which is located in the test area. An oil supply module for promoting hydraulic oil circulation is provided on the inlet oil circuit. The simulated load module is provided with a first load port and a second load port, which are respectively connected to the control oil circuit of the control valve under test. A throttle valve is provided in the simulated load module, and the two ends of the throttle valve are respectively connected to the first load port and the second load port through oil circuits. The other end of the return oil circuit is used to connect to the return port of the control valve under test.

[0007] Furthermore, the simulated load module is also equipped with a two-way cartridge valve assembly. The two outlets of the two-way cartridge valve assembly are respectively connected to the first load oil port and the second load oil port through oil circuits. The throttle valve is installed on the oil circuit connecting the two-way cartridge valve assembly to either the first load oil port or the second load oil port. The two-way cartridge valve assembly is used to control the opening and closing of the internal oil circuit of the simulated load module to prevent damage to the module due to misoperation.

[0008] Furthermore, the simulated load module is also equipped with several simulated pressure sensors, which are used to monitor pressure changes in the simulated load module.

[0009] Furthermore, a proportional pressure-flow valve group is installed on the oil line between the oil supply tank and the simulated load module. The proportional pressure-flow valve group is used to adjust the oil line pressure and oil line flow entering the simulated load module as needed.

[0010] Furthermore, an auxiliary oil inlet branch is provided on the oil inlet line for controlling the operation of the simulated load module, so as to control the two-way cartridge valve group (1208) in the simulated load module to achieve various functions.

[0011] Furthermore, several oil pressure sensors are installed on the oil line between the oil supply tank and the simulated load module. These oil pressure sensors are used to monitor pressure changes in the oil inlet line.

[0012] Furthermore, the oil supply module is installed in the oil line between the oil supply tank and the proportional pressure and flow valve assembly.

[0013] Furthermore, the oil supply module includes a vane pump, a check valve, and a high-pressure filter connected in series via the same oil circuit.

[0014] Furthermore, the power source of the vane pump is a variable frequency motor.

[0015] Furthermore, a return oil flow meter is installed on the return oil line.

[0016] Furthermore, it also includes an oil return module, which includes a circulating motor pump, a cooler, and an oil return filter arranged in series. The cooler is used to reduce the temperature of the oil return, and the oil return filter is used to filter impurities in the oil return.

[0017] Furthermore, it also includes several test pressure devices for testing the oil pressure feedback and pneumatic pressure feedback of the oil circuit in the test control valve.

[0018] Furthermore, the fuel supply tank is equipped with a fuel supply level controller, a fuel supply air filter, a fuel supply level gauge, a temperature sensor, and a heater. The fuel supply level controller is used to monitor whether there are any abnormalities in the fuel supply tank level. The fuel supply air filter is used to filter the air drawn into the fuel supply tank to prevent the fuel from being contaminated. The fuel supply level gauge is used to visually observe the fuel level in the fuel supply tank. The temperature sensor is used to detect the temperature of the fuel. The heater is used to heat the fuel.

[0019] Furthermore, the oil supply tank is also provided with an oil drain port for cleaning and draining oil, and an oil drain valve is provided on the oil drain port.

[0020] Furthermore, it also includes an oil collection tank, which is located below the tested control valve to collect oil that may leak from the tested control valve during the test. The supply tank and the oil collection tank are connected by a return oil circuit. A return oil pump and a return oil filter are sequentially installed on the return oil circuit. The return oil pump is used to pump the oil in the oil collection tank to the supply tank, and the return oil filter is used to filter the return oil to prevent contaminants from entering the supply tank.

[0021] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: 1. The present invention uses a throttle valve instead of a hydraulic cylinder or hydraulic motor as a simulated load connected to the control valve under test, enabling the simulation of more working conditions and better testing of the performance of the control valve under test; 2. The invention uses a throttle valve instead of a hydraulic cylinder or hydraulic motor as a simulated load connected to the control valve under test, which can accurately control changes in parameters such as oil pressure and oil flow, thus enabling the detection of the feedback of the control valve under test when these parameters change, and the test accuracy is also higher; 3. The throttle valve is smaller in size and simpler in structure than a hydraulic cylinder or hydraulic motor, thus greatly reducing the size of the test device and lowering the maintenance cost of the test device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the oil circuit of the present invention.

[0023] Figure 2 The present invention is intended to be connected to the oil circuit of the control valve under test.

[0024] Figure 3 This is a schematic diagram of the simulated load module in this invention.

[0025] Figure 4 This is a schematic diagram of the oil return module in this invention.

[0026] Figure 5 This is a schematic diagram of the oil supply module in this invention.

[0027] The components include: 1. Return oil flow meter; 2. Temperature sensor; 3. Oil supply tank; 4. Oil supply module; 401. Variable frequency motor; 402. Coupling; 403. Vane pump; 404. Check valve; 405. High-pressure filter; 5. Heater; 6. Electrical contact thermometer; 7. Drain valve; 8. Return oil module; 801. Return oil filter; 802. Return oil pump; 803. Oil collection tank level gauge; 804. Oil collection tank; 805. Oil collection tank filter; 806. Oil collection tank level controller; 9. Proportional pressure and flow valve assembly; 10. Test pressure sensor; 11. Test area; 12. Simulated load module; 1201, Control inlet of simulated load module; 1202, Simulated pressure gauge; 1203, Simulated pressure sensor; 1204, First load port; 1205, Simulated flow sensor; 1206, Throttle valve; 1207, Second load port; 1208, Two-way cartridge valve assembly; 13, Pressure gauge under test; 14, Pressure reducing valve; 15, Oil circuit pressure sensor; 16, Cooler; 17, Oil supply air filter; 18, Circulating motor pump; 19, Oil supply level gauge; 20, Oil supply level controller; 21, Return oil filter; 22, Control valve under test. Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0029] See appendix Figures 1 to 5 The present invention provides a testing device for a hydraulic winch control valve, comprising an oil supply tank 3, a simulated load module 12 and a return oil module 8. The first load port 1204 and the second load port 1207 of the simulated load module 12 face the test area 11, which is used to place the workpiece to be tested (i.e., the test control valve 22).

[0030] The inlet 1201 of the simulated load module is connected to the two-way cartridge valve assembly 1208 via an oil circuit. The two-way cartridge valve assembly 1208 is used to control the opening and closing of the internal oil circuit of the simulated load module 12 to prevent damage to the module due to misoperation. The inlet of the two-way cartridge valve assembly 1208 is connected to the control inlet 1201 of the simulated load module via an oil circuit. The two outlets of the two-way cartridge valve assembly 1208 are respectively connected to the first load oil port 1204 and the second load oil port 1207 via oil circuits. A throttle valve 1206 is installed on the oil circuit connecting the two-way cartridge valve assembly 1208 to the first load oil port 1204. A throttle valve 1206 is installed on the other end of the oil circuit where the throttle valve 1206 is located. A simulated flow sensor 1205 is provided on one side to monitor the flow rate of control oil through the control valve. The first load port 1204 and the second load port 1207 are respectively connected to the control oil circuit of the control valve under test 22. The simulated load module 12 is also provided with two simulated pressure sensors 1203 and two simulated pressure gauges 1202. One simulated pressure sensor 1203 and one simulated pressure gauge 1202 are used to monitor the pressure change of the first load port 1204, and the other simulated pressure sensor 1203 and the other simulated pressure gauge 1202 are used to monitor the pressure change of the second load port 1207.

[0031] One end of the oil supply tank 3 is connected to the oil inlet circuit and one end of the oil return circuit. The other end of the oil inlet circuit is connected to the oil inlet of the test control valve 22. Port P is the port connecting the oil inlet circuit and the oil inlet of the test control valve (22). The oil supply module 4 and the proportional pressure and flow valve group 9 for driving the hydraulic oil circulation are arranged in sequence on the oil inlet circuit. The oil supply module 4 includes a vane pump 403, a check valve 404 and a high pressure filter 405 arranged in series in the same oil circuit. A variable frequency motor 401 is arranged on the side of the vane pump 403. The variable frequency motor 401 is connected to the vane pump 403 through a coupling 402. The proportional pressure and flow valve group 9 is composed of several flow valves and is used to adjust the oil circuit pressure and oil circuit flow entering the simulated load module 12 as needed. An auxiliary oil inlet branch for controlling the operation of the simulated load module 12 is arranged on the oil inlet circuit. Various functions are achieved by controlling the two-way cartridge valve group 1208 in the simulated load module 12. The P' port is the port connecting the inlet oil circuit and the auxiliary inlet oil branch. An oil circuit pressure sensor 15 and a pressure reducing valve 14 are also installed on the oil circuit between the oil supply tank 3 and the simulated load module 12. The oil circuit pressure sensor 15 is used to monitor the pressure change in the inlet oil circuit, and the pressure reducing valve 14 is used to reduce the pressure when the inlet oil circuit pressure is too high. The T port is the return oil port of the oil supply tank 3. A return oil flow meter 1 is installed on the return oil circuit. The other end of the return oil circuit on the oil supply tank 3 is used to connect to the return oil port of the test workpiece (i.e., the test control valve 22). The return oil module includes a circulating motor pump 18, a cooler 16 and a return oil filter 21 arranged in series. The cooler 16 is used to reduce the temperature of the return oil, and the return oil filter 21 is used to filter impurities in the return oil.

[0032] The oil supply tank 3 is equipped with an oil supply level controller 20, an oil supply air filter 17, an oil supply level gauge 19, a temperature sensor 2, an electrical contact thermometer 6, and a heater 5. The oil supply level controller 20 is used to monitor whether there are any abnormalities in the oil supply level of the oil supply tank 3. The oil supply air filter 17 is used to filter the air drawn into the oil supply tank 3 to prevent the oil from being contaminated. The oil supply level gauge 19 is used to visually observe the liquid level in the oil supply tank 3. The temperature sensor 2 is used to detect the temperature of the oil. The heater 5 is used to heat the oil. The electrical contact thermometer 6 is used to display the temperature of the oil circuit. The oil supply tank 3 is also equipped with a drain port for cleaning and draining oil, and a drain valve 7 is installed on the drain port.

[0033] The oil return module 8 includes an oil collection tank 804, which is located below the test control valve 22 to collect oil that may leak from the test control valve 22 during testing. The supply tank 3 and the oil collection tank 804 are connected by a return oil circuit. A return oil pump 802 and a return oil filter 801 are sequentially installed on the return oil circuit. The return oil pump 802 is used to pump the oil in the oil collection tank 804 to the supply tank 3. The return oil filter 801 is used to filter the return oil to prevent contaminants from entering the supply tank 3. The oil collection tank 804 is equipped with an oil collection tank filter 805, an oil collection tank level gauge 803, and an oil collection tank level controller 806. The oil collection tank filter 805 is used to filter the oil in the oil collection tank 804. The oil collection tank level gauge 803 is used to visually observe the liquid level in the oil collection tank 804. The oil collection tank level controller 806 is used to monitor whether there are any abnormalities in the liquid level of the oil collection tank 804.

[0034] It also includes several test pressure sensors 10 and test pressure gauges 13 for testing the oil pressure feedback and air pressure feedback in the oil circuit of the test control valve 22.

[0035] In the simulated load module 12, the first load port 1204 and the second load port 1207 are the inlet and outlet ports of the test control valve 22, respectively, depending on the operating condition of the test control valve 22. That is, under one operating condition, the oil flows along the direction of test control valve 22 - first load port 1204 - simulated flow sensor 1205 - throttle valve 1206 - two-way cartridge valve group 1208 - second load port 1207 - test control valve 22. Under another operating condition, the oil flows along the direction of test control valve 22 - second load port 1207 - two-way cartridge valve group 1208 - throttle valve 1206 - simulated flow sensor 1205 - first load port 1204 - test control valve 22.

Claims

1. A testing device for a hydraulic winch control valve, characterized in that: The system includes an oil supply tank (3) and a simulated load module (12). The oil supply tank (3) is connected to one end of the oil inlet circuit and one end of the oil return circuit. The other end of the oil inlet circuit is connected to the oil inlet of the test control valve (22) located in the test area (11). An oil supply module (4) for driving the hydraulic oil circulation is provided on the oil inlet circuit. The simulated load module (12) is provided with a first load port (1204) and a second load port (1207). The first load port (1204) and the second load port (1207) are respectively connected to the control oil circuit of the test control valve (22). A throttle valve (1206) is provided inside the simulated load module (12). The two ends of the throttle valve (1206) are respectively connected to the first load port (1204) and the second load port (1207) through oil circuits. The other end of the return oil circuit is used to connect to the return oil port of the test control valve (22). The simulated load module (12) is also provided with a two-way cartridge valve group (1208). The two outlets of the two-way cartridge valve group (1208) are respectively connected to the first load port (1204) and the second load port (1207) through oil circuits. The throttle valve (1206) is set in the oil circuit of the two-way cartridge valve group (1208) connected to either the first load port (1204) or the second load port (1207).

2. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: The simulated load module (12) is also equipped with several simulated pressure sensors and simulated flow sensors. The simulated pressure sensors are used to monitor pressure changes in the simulated load module (12), and the simulated flow sensors are used to monitor the flow rate of control oil through the control valve.

3. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: A proportional pressure and flow valve group (9) is installed on the oil line between the oil supply tank (3) and the simulated load module (12). The proportional pressure and flow valve group (9) is used to adjust the oil pressure and flow rate entering the simulated load module (12) as needed.

4. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: An auxiliary oil inlet branch is provided on the oil inlet line to control the operation of the simulated load module (12) so as to control the two-way cartridge valve group (1208) in the simulated load module (12) to achieve various different functions.

5. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: Several oil pressure sensors (15) are also installed on the oil line between the oil supply tank (3) and the simulated load module (12). The oil pressure sensors (15) are used to monitor the pressure changes in the oil inlet line.

6. The testing device for a hydraulic winch control valve according to claim 3, characterized in that: The oil supply module (4) is installed on the oil line between the oil supply tank (3) and the proportional pressure and flow valve group (9). The oil supply module (4) includes a vane pump (403), a check valve (404) and a high pressure filter (405) connected in series on the same oil line. The power source of the vane pump (403) is a variable frequency motor (401).

7. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: It also includes an oil return module, which includes a circulating motor pump (18), a cooler (16) and an oil return filter (21) arranged in series. The cooler (16) is used to reduce the temperature of the oil return and the oil return filter (21) is used to filter impurities in the oil return.

8. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: The oil supply tank (3) is equipped with an oil supply level controller (20), an oil supply air filter (17), an oil supply level gauge (19), a temperature sensor (2), and a heater (5). The oil supply level controller (20) is used to monitor whether there is any abnormality in the oil supply tank (3). The oil supply air filter (17) is used to filter the air drawn into the oil supply tank (3) to prevent the oil from being contaminated. The oil supply level gauge (19) is used to visually observe the liquid level in the oil supply tank (3). The temperature sensor (2) is used to detect the temperature of the oil. The heater (5) is used to heat the oil. The oil supply tank (3) is also equipped with a drain port for cleaning and draining oil, and a drain valve is provided on the drain port.

9. The testing device for a hydraulic winch control valve according to claim 1, characterized in that: It also includes an oil collection tank (804), which is located below the test control valve (22) to collect oil that may leak from the test control valve (22) during the test. The supply tank (3) and the oil collection tank (804) are connected by a return oil circuit. A return oil pump (802) and a return oil filter (801) are sequentially installed on the return oil circuit. The return oil pump (802) is used to pump the oil in the oil collection tank (804) to the supply tank (3). The return oil filter (801) is used to filter the return oil to prevent contaminants from entering the supply tank (3).

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