Ultrahigh pressure hydraulic strength test system

Abstract

The invention discloses an ultrahigh pressure hydraulic strength test system, which solves the problems of low pressure control precision, low operation safety and insufficient automation degree in the prior art, and comprises a test bed, an oil supply pipeline and an oil return pipeline which are connected through pipelines, the oil supply pipeline is communicated with the oil return pipeline through an ultrahigh pressure air pressure load back pressure valve, a pneumatic control interface of the ultrahigh pressure air pressure load back pressure valve is connected with an output interface of a pneumatic electronic pressure controller, and an air source interface of the pneumatic electronic pressure controller is connected with a compressed air source; a safety valve and an electromagnetic unloading valve are connected with the ultrahigh pressure air pressure load back pressure valve in parallel, and a pressure sensor is arranged on the oil supply pipeline. The test bed comprises a box body, an automatic lifting door is arranged at an opening of the box body, the automatic lifting door is connected with the box body through a magnetic coupling type rodless cylinder, and the magnetic coupling type rodless cylinder is connected with a compressed air source through an air path electromagnetic reversing valve; a proximity switch is arranged on the box body, and a proximity switch limiting baffle is correspondingly arranged on the automatic lifting door.

Description

Technical Field

[0001] The invention relates to a hydraulic test device, in particular to an ultra-high pressure hydraulic strength test system. Background Art

[0002] At present, hydraulic strength testing equipment is widely used in industrial production and scientific research. After the design and production of hydraulic products are completed, the product's compressive strength needs to be tested according to the design parameters to verify whether the product's compressive strength meets the design requirements.

[0003] The pressurization methods in the traditional hydraulic strength test process mainly include the following three methods:

[0004] 1) Use a hand pump to manually pressurize to the test pressure

[0005] A hand pump is used to manually pressurize to the test pressure, and the pressure stability is controlled manually. In order to maintain the pressure stability of the test system, the operator is required to observe the system pressure value at all times and manually pressurize. This is labor-intensive and has high requirements for the operator. The system pressure value has low accuracy, and the operator's direct operation of the ultra-high pressure hand pump is unsafe.

[0006] 2) Use hydraulic system or pneumatic drive booster mechanism to boost pressure to test pressure

[0007] A hydraulic or pneumatically driven booster mechanism is used to increase pressure to the test pressure. When the test system generates flow, the booster mechanism initiates the boosting operation, requiring the internal components (such as the piston and valve core) to continuously change direction. Therefore, during the test, if the product experiences internal leakage, the test system pressure drops, forcing the internal components of the booster mechanism to reverse direction and increase pressure. This can cause pressure fluctuations in the test system. Furthermore, at the moment of reversal, the fluid's flow rate and direction change dramatically, generating significant impact forces. These pressure fluctuations and impacts can affect the accuracy of test results and even damage the test equipment and product.

[0008] 3) A mechanical-hydraulic control system uses a manual pressure regulating valve to adjust the hydraulic pump output pressure. Direct operation of the ultra-high pressure manual relief valve by the operator is unsafe. In emergencies such as oil injection, the pressure cannot be quickly reduced, which can easily lead to safety accidents and damage to test equipment and personnel. Furthermore, manual control of system pressure has poor stability and a low degree of automation. Summary of the Invention

[0009] The purpose of the present invention is to solve the technical problems of low pressure control accuracy, low operation safety and insufficient automation in the prior art, and to provide an ultra-high pressure hydraulic strength testing system.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] An ultra-high-pressure hydraulic strength test system includes a test bench, an ultra-high-pressure pump, an oil supply pipeline, and an oil return pipeline. The test bench is used to place the product to be tested and install various hydraulic and electronic control systems. The oil suction port of the ultra-high-pressure pump is connected to the oil tank, and the oil supply port of the ultra-high-pressure pump is connected to the oil inlet of the product to be tested via an oil supply pipeline. One end of the oil return pipeline is connected to the oil outlet of the product to be tested, and the other end is connected to the oil tank to form a hydraulic circuit. The special feature of the system is that the oil supply pipeline and the oil return pipeline are connected through an ultra-high-pressure air pressure load back pressure valve, the pneumatic control interface of the ultra-high-pressure air pressure load back pressure valve is connected to the output interface of the pneumatic electronic pressure controller, and the air source interface of the pneumatic electronic pressure controller is connected to a compressed air source.

[0012] There are two protection branches connected in parallel with the branch where the ultra-high pressure air load back pressure valve is located. One of the protection branches is provided with a safety valve, and the other protection branch is provided with an electromagnetic unloading valve;

[0013] A pressure sensor is provided on the oil supply pipeline, and the pressure sensor is electrically connected to the pneumatic electronic pressure controller, and is used to feed back the oil pressure signal of the hydraulic circuit to the pneumatic electronic pressure controller;

[0014] The test bench includes a box body, an automatic lifting door is provided at the opening of the box body, and both sides of the automatic lifting door are connected to the box body through magnetic coupling rodless cylinders, and the two magnetic coupling rodless cylinders are connected to the compressed air source through air circuit electromagnetic reversing valves, forming a two-way automatic door control circuit to control the lifting of the automatic lifting door;

[0015] The box body has a lifting door open position and a lifting door closed position, both positions are provided with proximity switches, and the automatic lifting door is correspondingly provided with a proximity switch limit baffle;

[0016] The ultra-high pressure pump, proximity switch, pneumatic electronic pressure controller, safety valve, gas circuit electromagnetic reversing valve and electromagnetic unloading valve are all electrically connected to the electronic control device.

[0017] Furthermore, each automatic door control circuit includes independently arranged upper inlet and outlet pipes and lower inlet and outlet pipes, and each inlet and outlet pipe is installed with a one-way throttle valve, which includes a one-way valve and a throttle valve arranged in parallel; and the installation method of the one-way valve and the throttle valve meets the following conditions:

[0018] When the lower end of the magnetic rodless cylinder is inflated, the one-way valve at the lower end opens, the throttle valve at the lower end does not work, the one-way valve at the upper end closes, and the throttle valve at the upper end controls the rising speed of the automatic lift door;

[0019] When the upper end of the magnetic rodless cylinder is inflated, the one-way valve at the upper end opens, the throttle valve at the upper end does not work, the one-way valve at the lower end closes, and the throttle valve at the lower end controls the descending speed of the automatic lift door.

[0020] Furthermore, the ultra-high pressure pump is an ultra-high pressure plunger pump, and the ultra-high pressure pump is driven by a variable frequency motor.

[0021] Furthermore, the working medium of the hydraulic circuit is Skydrol LD-4, the working pressure is 2 to 105 MPa, the pressure control accuracy is ±0.2 MPa, and the system oil supply flow rate is ≮5 L / min.

[0022] Furthermore, oil filters are installed on the oil suction port and oil return pipeline of the ultra-high pressure pump.

[0023] Furthermore, a pressure gauge is provided on the oil supply pipeline.

[0024] Furthermore, the ultra-high pressure hydraulic strength test system also includes a water cooling and heat dissipation system, which includes a radiator, a circulating water pipeline connected to the inlet and outlet of the radiator, and a water solenoid valve arranged on the circulating water pipeline;

[0025] The radiator is arranged on the oil return pipeline and is used to dissipate heat for the working medium of the oil return pipeline;

[0026] The water circuit solenoid valve is electrically connected to the electronic control device and is used to control the start and stop of the circulating water in the water cooling and heat dissipation system.

[0027] Furthermore, the water cooling system also includes a water filter for filtering impurities in the water.

[0028] Furthermore, a liquid level relay and a temperature sensor are provided in the oil tank;

[0029] The liquid level relay is used to detect the oil level in the oil tank. When the oil is insufficient, a feedback signal is sent to the electronic control device.

[0030] The temperature sensor is used to detect the oil temperature in the oil tank and feed back a signal to the electronic control device to control the start and stop of the circulating water in the water cooling system through the water circuit solenoid valve.

[0031] Furthermore, an air filter and an air pressure reducing valve are arranged in series at the outlet of the compressed air source.

[0032] Compared with the prior art, the ultra-high pressure hydraulic strength testing system provided by the present invention has the following beneficial effects:

[0033] 1. This ultra-high-pressure hydraulic strength testing system uses a variable-frequency motor to drive an ultra-high-pressure pump, providing the pressure source for the test. The system flow rate can be adjusted by adjusting the speed of the variable-frequency motor, achieving a low-pressure oil flow rate greater than 5 L / min.

[0034] 2. The present invention provides an ultra-high-pressure hydraulic strength test system that utilizes an ultra-high-pressure pneumatic load back-pressure valve and a pneumatic electronic pressure controller to provide stepless system pressure regulation. A pressure sensor feeds back a pressure signal to the pneumatic electronic pressure controller, providing real-time feedback on the current system pressure. The pneumatic electronic pressure controller then controls the opening of the ultra-high-pressure pneumatic load back-pressure valve based on the pressure signal, creating a closed-loop pressure control system. This stabilizes the test pressure within ±0.2 MPa and automatically adjusts the system oil pressure, ensuring greater stability.

[0035] 3. The present invention provides an ultra-high pressure hydraulic strength test system equipped with a safety valve and an electromagnetic unloading valve, which automatically relieves pressure when the system pressure exceeds the set value. When oil injection or other abnormalities occur, the electronic control device controls the system to cut off power and the electromagnetic unloading valve performs emergency pressure relief to ensure the safety of equipment and personnel.

[0036] 4. The present invention provides an ultra-high pressure hydraulic strength testing system, wherein the ultra-high pressure pump oil suction port and the oil return line are equipped with oil filters to prevent impurities from entering the system and damaging components.

[0037] 5. The ultra-high pressure hydraulic strength testing system of the present invention is also equipped with a water cooling system in the oil return pipeline, which cools the heated hydraulic oil through the radiator. The temperature sensor and the water circuit solenoid valve cooperate to control the on and off of the water circulation system to maintain a suitable working oil temperature in the hydraulic circuit.

[0038] 6. The present invention provides an ultra-high-pressure hydraulic strength testing system, which is provided with proximity switches on the box body and the automatic lifting door, and electrically connects the proximity switches to the electronic control device. When the proximity switch detects that the automatic lifting door is in a closed state, the electronic control device sends a command to the pneumatic electronic pressure controller, and the system can perform a pressure boosting operation. When the proximity switch does not detect that the automatic lifting door is in a closed state, the system cannot perform a pressure boosting operation.

[0039] 7. The present invention provides an ultra-high pressure hydraulic strength testing system, which controls the lifting and lowering of an automatic lifting door through a magnetic rodless cylinder, and installs a one-way throttle valve on the upper and lower air inlet and outlet pipes, that is, the one-way valve and the throttle valve are arranged in parallel. When the lower end of the magnetic rodless cylinder is inflated, the automatic lifting door moves upward, the one-way valve at the lower air inlet opens, the throttle valve at the lower end does not work, the one-way valve at the upper air outlet closes, and the throttle valve at the upper end can adjust the rising speed of the automatic lifting door, which is safe and reliable; when the upper end of the magnetic rodless cylinder is inflated, the automatic lifting door moves downward, the one-way valve at the upper air inlet opens, the throttle valve at the upper end does not work, the one-way valve at the lower air outlet closes, and the throttle valve at the lower end can adjust the descending speed of the automatic lifting door, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural principle diagram of an embodiment of an ultra-high pressure hydraulic strength testing system of the present invention;

[0041] Figure 2 This is a structural diagram of the connection between the box and the automatic lifting door of an embodiment of an ultra-high pressure hydraulic strength testing system of the present invention;

[0042] Figure 3 This is a schematic structural diagram of an automatic lifting door of a test bench in an open state according to an embodiment of an ultra-high pressure hydraulic strength test system of the present invention;

[0043] Figure 4 The present invention is a schematic structural diagram of an ultra-high pressure hydraulic strength test system embodiment of a test bench automatic lifting door closed state.

[0044] Figure Number:

[0045] 1. Automatic lifting door; 2. Proximity switch; 3. Oil supply line; 4. Oil return line; 5. Safety valve; 6. Solenoid unloading valve; 7. Air circuit solenoid reversing valve; 8. Air pressure reducing valve; 9. Pressure sensor; 10. One-way throttle valve; 11. Electronic control device; 12. Frequency conversion motor; 13. Ultra-high pressure pump; 14. Oil filter; 15. Ultra-high pressure air pressure back pressure valve; 16. Pneumatic electronic pressure controller; 17. Radiator; 18. Water filter; 19. Water circuit solenoid valve; 20. Liquid level relay; 21. Temperature sensor; 22. Magnetic rodless cylinder; 23. Box; 24. Double electrical button box; 25. Proximity switch limit baffle; 26. Pressure gauge; 27. Main frame; 28. Component installation box; 29. Distribution box. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0047] like Figure 1-4 As shown, in order to achieve stable pressure and automatic control of the ultra-high-pressure hydraulic strength test system, the present invention designs an ultra-high-pressure hydraulic strength test system, which includes a test bench, an ultra-high-pressure pump 13, an oil supply line 3, and an oil return line 4. The test bench is used to place the product to be tested and install various hydraulic and electronic control systems. The oil suction port of the ultra-high-pressure pump 13 is connected to the oil tank, and the oil supply port of the ultra-high-pressure pump 13 is connected to the oil inlet of the product to be tested through the oil supply line 3. One end of the oil return line 4 is connected to the oil outlet of the product to be tested, and the other end is connected to the oil tank, forming a hydraulic circuit. The oil supply line 3 and the oil return line 4 are connected via an ultra-high-pressure air pressure load back pressure valve 15. The pneumatic control interface of the ultra-high-pressure air pressure load back pressure valve 15 is connected to the output interface of the pneumatic electronic pressure controller 16, and the air source interface of the pneumatic electronic pressure controller 16 is connected to a compressed air source. A pressure gauge 26 is also provided on the oil supply line 3. The compressed air source is filtered through a pneumatic doublet (i.e., the air pressure reducing valve 8 and the filter) and reduced in pressure to about 0.75 MPa before being used by the system.

[0048] Two protection branches are connected in parallel with the branch where the ultra-high-pressure air load back-pressure valve 15 is located. One of the protection branches is equipped with a safety valve 5, and the other is equipped with an electromagnetic unloading valve 6. A pressure sensor 9 is provided on the oil supply line 3. The pressure sensor 9 is electrically connected to the pneumatic electronic pressure controller 16 and is used to feedback the oil pressure signal of the hydraulic circuit to the pneumatic electronic pressure controller 16. The system pressure is steplessly regulated by the combination of the ultra-high-pressure air load back-pressure valve 15 and the pneumatic electronic pressure controller 16. The pressure signal is fed back to the pneumatic electronic pressure controller 16 through the pressure sensor 9, and the current system pressure is fed back in real time. The pneumatic electronic pressure controller 16 controls the opening of the ultra-high-pressure air load back-pressure valve 15 based on the pressure signal, forming a pressure closed-loop control, so that the test pressure is stabilized within ±0.2Mpa, and the system oil pressure is automatically adjusted to make the system oil pressure more stable.

[0049] The test bench is a box-type structure, comprising a main frame 27, a box 23, and an electronic control device 11. An automatic lift door 1 is installed at the opening of the box 23. Both sides of the automatic lift door 1 are connected to the box 23 via magnetically coupled rodless cylinders 22. These two magnetically coupled rodless cylinders 22 are connected to a compressed air source via air-circuit electromagnetic reversing valves 7, forming a two-way automatic door control circuit to control the raising and lowering of the automatic lift door 1. The main frame 27 is a stainless steel profile structure and is the installation body of the various components of the test bench. It mainly consists of a component installation box 28 and a distribution box 29. The test bench hydraulic circuit related components, water cooling system and movable door related components are all reasonably installed and arranged in the component installation box 28. The distribution box 29 is completely isolated from the component installation box 28 and is mainly used to install the components of the test bench's power distribution and electronic control device 11; the box body 23 is located at the upper front end of the test bench as a protective box for the product to be tested. The box body 23 and the automatic lifting door 1 are mainly made of aluminum profile structure. A test observation window is reserved on the automatic lifting door 1, and the observation window is installed with bulletproof glass for safety protection; the electronic control device 11 adopts a rocker arm hanging box structure and is arranged on one side of the main frame 27. The rocker arm is fixedly installed on the top of the main frame 27, and the electronic control device 11 is fixed to the other end of the rocker arm. It can be rotated and moved within a certain range for easy use by the operator.

[0050] The box body 23 has an automatic lifting door open position and an automatic lifting door closed position. Both positions are provided with a proximity switch 2, and a proximity switch limit baffle 25 is correspondingly provided on the automatic lifting door 1; the automatic lifting door 1 is controlled to rise and fall by a compressed air source and an air circuit electromagnetic reversing valve 7. When the automatic lifting door needs to be moved, the operator controls the dual electrical button box 24 to operate, and the dual electrical button box 24 controls the working state of the air circuit electromagnetic reversing valve 7. The connection relationship between the dual electrical button box 24 and the air circuit electromagnetic reversing valve 7 is the existing technology and will not be elaborated on here. Simultaneously pressing the raise or lower button on the dual electrical button box 24 with both hands switches the air circuit electromagnetic reversing valve 7. Gas enters the magnetic rodless cylinder 22, pushing it to move, thereby driving the automatic lift door 1 along the linear guide. One-way throttle valves 10 are installed at the upper and lower inlet and outlet ports of the magnetic rodless cylinder 22 to regulate the gas flow rate and control the lifting speed of the movable door. The upper gas inlet and outlet of the magnetic rodless cylinder 22 are located at the same position, and the lower end is similarly designed. When the automatic lift door 1 reaches its upper or lower limit, the proximity switch 2 sends a signal to the electronic control device 11 to control the air circuit electromagnetic reversing valve 7 to cut off the air supply, maintaining the automatic lift door 1 in its current position. When the proximity switch 2 detects that the automatic lift door 1 is closed, the electronic control device 11 sends a command to the pneumatic electronic pressure controller 16 to initiate a pressure increase. If the proximity switch 2 does not detect that the automatic lift door 1 is closed, the system cannot perform a pressure increase, ensuring the safety of the test.

[0051] The ultra-high pressure pump 13 , the proximity switch 2 , the pneumatic electronic pressure controller 16 , the safety valve 5 , the gas circuit electromagnetic reversing valve 7 , and the electromagnetic unloading valve 6 are all electrically connected to the electronic control device 11 .

[0052] Each automatic door control circuit includes independently set upper end inlet and outlet pipes and lower end inlet and outlet pipes. A one-way throttle valve 10 is installed on each inlet and outlet pipe. The one-way throttle valve 10 includes a one-way valve and a throttle valve arranged in parallel; when the lower end of the magnetic rodless cylinder 22 is intake air, that is, when the automatic lifting door 1 moves upward, the compressed air enters the lower cavity of the magnetic rodless cylinder through the one-way throttle valve 10 at the lower end air inlet under the action of pressure, that is, the one-way valve at the lower end is opened and the throttle valve at the lower end does not work. At this time, the gas in the upper chamber of the magnetic rodless cylinder 22 is discharged through the one-way throttle valve 10 at the upper end of the air outlet, that is, the one-way valve at the upper end is closed and the throttle valve at the upper end is in operation. By adjusting the throttle valve at the upper end, the rising speed of the automatic lifting door 1 can be controlled safely and reliably. When the upper end of the magnetic rodless cylinder 22 is intaken, that is, the automatic lifting door 1 moves downward, the compressed air under pressure enters the upper chamber of the magnetic rodless cylinder through the one-way throttle valve 10 at the upper end of the air inlet, that is, the one-way valve at the upper end is opened and the throttle valve at the upper end is inoperative. The gas in the lower chamber of the magnetic rodless cylinder 22 is discharged through the one-way throttle valve 10 at the lower end of the air outlet, that is, the one-way valve at the lower end is closed and the throttle valve at the lower end is in operation. At this time, by adjusting the throttle valve at the lower end, the descending speed of the automatic lifting door 1 can be controlled safely and reliably. This motion state is the unilateral motion state of the magnetic rodless cylinder 22. The motion states on both sides are the same, rising and descending at the same time, and no further description will be given here.

[0053] Ultrahigh-pressure pump 13 is an ultrahigh-pressure plunger pump driven by a variable-frequency motor 12. An oil filter 14 is installed on both the oil suction port and the oil return line 4 of ultrahigh-pressure pump 13. The variable-frequency motor 12 drives ultrahigh-pressure pump 13, providing a pressure source for the test. The system flow rate can be adjusted by adjusting the speed of the variable-frequency motor 12. The hydraulic circuit's working medium is Skydrol LD-4, with an operating pressure of 2 to 105 MPa, a pressure control accuracy of ±0.2 MPa, and a system oil flow rate of ≮5 L / min.

[0054] The ultra-high-pressure hydraulic strength test system also includes a water-cooling heat dissipation system, which includes a radiator 17, a circulating water pipeline connecting the inlet and outlet of radiator 17, and a water circuit solenoid valve 19 disposed on the circulating water pipeline. Radiator 17 is disposed on the return oil pipeline 4 and is used to dissipate heat from the working medium in the return oil pipeline 4. Water circuit solenoid valve 19 is electrically connected to the electronic control device 11 and is used to control the start and stop of the circulating water in the water-cooling heat dissipation system. The water-cooling heat dissipation system also includes a water filter 18 for filtering impurities in the water. A liquid level relay 20 and a temperature sensor 21 are disposed within the oil tank. The liquid level relay 20 is used to detect the oil level in the oil tank and provide feedback signals to the electronic control device 11. The temperature sensor 21 is used to detect the oil temperature in the oil tank and provide feedback signals to the electronic control device 11 to control the start and stop of the circulating water in the water-cooling heat dissipation system.

[0055] Before the test, the operator inputs the test parameters, such as test pressure, pressure holding time, etc., through the control interface (i.e., the control interface of the electronic control device 11, which can be a display or an external laptop computer). During the test, the control program automatically controls the operation of the hydraulic circuit, compressed air source control, and water cooling system according to preset parameters. Multiple sensors collect pressure, temperature, and other data in real time, and transmit them to the data acquisition system of the electronic control device 11 for processing and storage. The data acquisition system can perform real-time analysis on the collected data, such as drawing pressure-time curves, etc., to facilitate the test personnel to intuitively understand the performance changes of the test piece during the test. At the same time, the electronic control device 11 can detect system fault conditions such as motor overload, low liquid level, high temperature, pressure limit, and failure to close the lifting door during the test, and prompt methods to eliminate the fault.

[0056] The operation process of the ultra-high pressure hydraulic strength test system is as follows:

[0057] ① Turn on the main power switch on the electronic control device 11 of the ultra-high pressure hydraulic strength test system;

[0058] ② Simultaneously press the up button of each dual electrical button box 24 with both hands to control the automatic lift door 1 to open, then place the product to be tested in the box 23, and connect the pipelines of the product to be tested and the test system according to the test requirements of the product to be tested (only connect the oil supply port or connect the supply and return ports at the same time). Finally, simultaneously press the down button of each dual electrical button box 24 with both hands to control the automatic lift door 1 to close, ensuring that the lift door is completely closed, otherwise the boost operation cannot be performed.

[0059] ③ Check the external air source and circulating water.

[0060] ④Choose automatic control or manual control to conduct pressure test;

[0061] a. Automatic control: Select automatic control on the operating interface of the electronic control device 11, set the test pressure, pressure holding time and other parameters of the product to be tested, press the pump group start button on the operating interface of the electronic control device 11, the system starts to slowly increase the pressure, when the pressure reaches the set value, the system starts to automatically count, when the time reaches the set value, the system starts to automatically slowly reduce the pressure, and the interface prompts that the test is over. Press the pump group off button to turn off the pump group motor of the ultra-high pressure pump 13.

[0062] b. Manual control: Select manual control on the operation interface of the electronic control device 11, press the pump group start button on the operation interface of the electronic control device 11, and the pneumatic ultra-high pressure pump 13 will increase the pressure by rotating the voltage regulating potentiometer on the electronic control device 11 (turn right to increase the pressure, turn left to reduce the pressure). When the pressure is adjusted to the test pressure value, start maintaining the pressure and timing. When the test time reaches the preset time, reduce the pressure again by rotating the voltage regulating potentiometer (turn right to increase the pressure, turn left to reduce the pressure). When the pressure is adjusted to the minimum pressure value of the system, turn off the pump group motor.

[0063] ⑤ Simultaneously press the up button of the dual electrical button box 24 with both hands to control the automatic lift door 1 to open, remove the connecting pipes between the product to be tested and the test system, and simultaneously press the down button of the dual electrical button box 24 with both hands to control the automatic lift door 1 to close.

[0064] ⑥ Turn off the main power switch on the ultra-high pressure hydraulic strength test system electronic control device 11, and the test is completed.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An ultra-high pressure hydraulic strength test system, comprising a test bench, an ultra-high pressure pump (13), an oil supply pipeline (3) and an oil return pipeline (4), wherein the test bench is used to place the product to be tested and install various hydraulic and electronic control systems, the oil suction port of the ultra-high pressure pump (13) is connected to the oil tank, the oil supply port of the ultra-high pressure pump (13) is connected to the oil inlet of the product to be tested through the oil supply pipeline (3), one end of the oil return pipeline (4) is connected to the oil outlet of the product to be tested, and the other end is connected to the oil tank to form a hydraulic circuit; characterized in that: The oil supply pipeline (3) and the oil return pipeline (4) are connected via an ultra-high pressure air pressure load back pressure valve (15), a pneumatic control interface of the ultra-high pressure air pressure load back pressure valve (15) is connected to an output interface of a pneumatic electronic pressure controller (16), and an air source interface of the pneumatic electronic pressure controller (16) is connected to a compressed air source; The branch where the ultra-high pressure air load back pressure valve (15) is located is connected in parallel with two protection branches, one of which is provided with a safety valve (5) and the other is provided with an electromagnetic unloading valve (6); The oil supply pipeline (3) is provided with a pressure sensor (9), which is electrically connected to the pneumatic electronic pressure controller (16) and is used to feed back the oil pressure signal of the hydraulic circuit to the pneumatic electronic pressure controller (16); The test bench includes a box (23), an automatic lifting door (1) is provided at the opening of the box (23), both sides of the automatic lifting door (1) are connected to the box (23) via magnetic coupling type rodless cylinders (22), and the two magnetic coupling type rodless cylinders (22) are connected to the compressed air source via air circuit electromagnetic reversing valves (7) to form a two-way automatic door control circuit to control the lifting of the automatic lifting door (1); The box (23) has a lifting door opening position and a lifting door closing position, both positions are provided with a proximity switch (2), and a proximity switch limit baffle (25) is correspondingly provided on the automatic lifting door (1); The ultra-high pressure pump (13), the proximity switch (2), the pneumatic electronic pressure controller (16), the safety valve (5), the gas circuit electromagnetic reversing valve (7) and the electromagnetic unloading valve (6) are all electrically connected to the electronic control device (11).

2. The ultra-high pressure hydraulic strength testing system according to claim 1, characterized in that: Each automatic door control circuit includes an upper air inlet and outlet pipe and a lower air inlet and outlet pipe that are independently arranged. A one-way throttle valve (10) is installed on each air inlet and outlet pipe. The one-way throttle valve (10) includes a one-way valve and a throttle valve that are arranged in parallel. The installation method of the one-way valve and the throttle valve meets the following conditions: When the lower end of the magnetic coupling rodless cylinder (22) is inflated, the one-way valve at the lower end is opened, the throttle valve at the lower end does not work, the one-way valve at the upper end is closed, and the throttle valve at the upper end controls the rising speed of the automatic lifting door (1); When the upper end of the magnetic coupling type rodless cylinder (22) is inflated, the one-way valve at the upper end is opened, the throttle valve at the upper end does not work, the one-way valve at the lower end is closed, and the throttle valve at the lower end controls the descending speed of the automatic lifting door (1).

3. The ultra-high pressure hydraulic strength testing system according to claim 1, characterized in that: The ultra-high pressure pump (13) is an ultra-high pressure plunger pump, and the ultra-high pressure pump (13) is driven by a variable frequency motor (12).

4. The ultra-high pressure hydraulic strength testing system according to claim 3, characterized in that: The working medium of the hydraulic circuit is Skydrol LD-4, the working pressure is 2~105MPa, the pressure control accuracy is ±0.2Mpa, and the system oil supply flow rate is ≮5L / min.

5. The ultra-high pressure hydraulic strength testing system according to claim 1, characterized in that: An oil filter (14) is installed on the oil suction port and the oil return pipeline (4) of the ultra-high pressure pump (13).

6. The ultra-high pressure hydraulic strength testing system according to claim 1, characterized in that: A pressure gauge (26) is also provided on the oil supply pipeline (3).

7. The ultra-high pressure hydraulic strength testing system according to claim 1, characterized in that: It also includes a water cooling and heat dissipation system, which includes a radiator (17), a circulating water pipeline connected to the inlet and outlet of the radiator (17), and a water circuit solenoid valve (19) arranged on the circulating water pipeline; A radiator (17) is provided on the oil return pipeline (4) and is used to dissipate heat for the working medium in the oil return pipeline (4); The water circuit solenoid valve (19) is electrically connected to the electric control device (11) and is used to control the start and stop of circulating water in the water cooling and heat dissipation system.

8. The ultra-high pressure hydraulic strength testing system according to claim 7, characterized in that: The water cooling and heat dissipation system further comprises a water filter (18) for filtering impurities in the water.

9. The ultra-high pressure hydraulic strength testing system according to claim 7, characterized in that: A liquid level relay (20) and a temperature sensor (21) are provided in the oil tank; The liquid level relay (20) is used to detect the oil level in the oil tank, and when the oil level is insufficient, a feedback signal is sent to the electronic control device (11); The temperature sensor (21) is used to detect the oil temperature in the oil tank and feed back a signal to the electronic control device (11) to control the start and stop of the circulating water in the water cooling and heat dissipation system through the water circuit solenoid valve (19).

10. The ultra-high pressure hydraulic strength testing system according to claim 1, characterized in that: An air filter and an air pressure reducing valve (8) are arranged in series at the outlet of the compressed air source.

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