Hydraulic cylinder shaking and crawling detection system

Abstract

The utility model discloses a hydraulic cylinder shaking creeping detection system, which comprises a test bed, a detection device, a first load oil cylinder and a hydraulic control device, and is characterized in that the test bed is used for fixing a cylinder body of a hydraulic cylinder to be detected, and the detection device is used for detecting operation data of a piston rod of the hydraulic cylinder to be detected; the first load oil cylinder can drive a piston rod of a hydraulic cylinder to be tested to do telescopic motion, the hydraulic control device comprises first flow adjusting valves and a first proportional overflow valve, and the first flow adjusting valves are arranged on oil inlet oil ways of a rodless cavity and a rod cavity of the first load oil cylinder. First proportional overflow valves are arranged on oil return paths of a rodless cavity and a rod cavity of the first load oil cylinder, and the first flow regulating valves are used for regulating according to set values and opening and closing states of the first proportional overflow valves, so that the system can more accurately and intuitively judge the jitter crawling intensity of the hydraulic cylinder to be detected, the detection efficiency is improved, and the detection accuracy is improved. And the detection error is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder fault detection technology, specifically relating to a hydraulic cylinder vibration and crawling detection system. Background Technology

[0002] As industry develops towards higher levels, the processing of increasingly complex products requires hydraulic cylinders in manufacturing equipment to operate at ultra-low speeds. This is especially true for engineering cranes in the current market, where hydraulic cylinders need to maintain stability during low-speed extension and retraction. Vibration and creep are common and significant problems with hydraulic cylinders. Currently, the detection of vibration and creep during low-speed operation of hydraulic cylinders relies primarily on human experience and perception. This method is inefficient and cannot quantify the severity of vibration and creep, exhibiting significant limitations. Utility Model Content

[0003] To address the aforementioned deficiencies or shortcomings, this utility model provides a hydraulic cylinder vibration and crawling detection system, aiming to solve the technical problems of existing technologies that rely on manual inspection of hydraulic cylinders, resulting in low detection efficiency and difficulty in quantifying the severity of vibration and crawling.

[0004] To achieve the above objectives, this utility model provides a hydraulic cylinder vibration and crawling detection system, which includes a test bench, a detection device, a first load cylinder, and a hydraulic control device. The test bench is used to fix the cylinder body of the hydraulic cylinder under test. The detection device is used to detect the operating data of the piston rod of the hydraulic cylinder under test. The first load cylinder can drive the piston rod of the hydraulic cylinder under test to perform telescopic movement. The hydraulic control device includes a first flow regulating valve and a first proportional relief valve. The first flow regulating valve is provided on the oil inlet lines of both the rodless chamber and the rod chamber of the first load cylinder, and the first proportional relief valve is provided on the oil return lines of both the rodless chamber and the rod chamber of the first load cylinder. The first flow regulating valve is used to adjust according to the set value and opening / closing state of the first proportional relief valve.

[0005] In this embodiment of the present invention, the first flow regulating valve is a cartridge valve, which has a first main oil port, a second main oil port and a first control port. The first control port and the second main oil port are connected and configured to regulate the flow rate from the first main oil port to the second main oil port according to the set value and opening / closing state of the first proportional relief valve.

[0006] In this embodiment of the utility model, the hydraulic control device further includes a second proportional relief valve. The two ports of the second proportional relief valve are respectively connected to the oil inlet circuit and the oil return circuit of the first load cylinder. The second proportional relief valve is used to control the maximum working pressure of the oil circuit of the first load cylinder.

[0007] In this embodiment of the invention, the hydraulic cylinder vibration and crawling detection system further includes a second load cylinder. The test bench includes a platform body and a lifting frame. The platform body allows for the hinged installation of the cylinder body of the hydraulic cylinder under test and the cylinder body of the first load cylinder. The piston rods of the hydraulic cylinder under test and the first load cylinder are arranged facing each other and connected by a coupling. The lifting frame allows for the lifting of the second load cylinder, so that the second load cylinder is set perpendicular to the hydraulic cylinder under test, and the piston rod of the second load cylinder can apply a force to the cylinder body of the hydraulic cylinder under test.

[0008] In this embodiment of the present invention, the cylinder body of the second load cylinder includes a first cylinder section and a second cylinder section arranged sequentially. The piston rod of the second load cylinder is provided with a first piston and a second piston at both ends. The first piston is located in the first cylinder section and the second piston is located in the second cylinder section. The rodless chamber of the first cylinder section is connected to the oil inlet passage and the oil return passage of the second load cylinder. The rod chamber and the rodless chamber of the second cylinder section are both connected to a pneumatic control assembly. The pneumatic control assembly is used to introduce gas into the rod chamber and / or the rodless chamber of the second cylinder section.

[0009] In this embodiment of the utility model, the hydraulic control device further includes a first directional valve and a third proportional relief valve. The first directional valve is a three-position four-way directional valve and has a first working port and a second working port. The first working port is connected to the rod chamber oil circuit of the hydraulic cylinder under test, and the second working port is connected to the rodless chamber oil circuit of the hydraulic cylinder under test. The first directional valve is used to select one of the first working port and the second working port to be connected to the inlet port of the first directional valve, and the other to be connected to the return port of the first directional valve. The two ports of the third proportional relief valve are respectively connected to the inlet oil circuit and the return oil circuit of the first directional valve.

[0010] In this embodiment of the utility model, the oil inlet circuit of the first directional valve includes a first oil inlet branch and a second oil inlet branch. The hydraulic control device also includes a second flow regulating valve and a proportional pressure reducing valve. The second flow regulating valve is located on the first oil inlet branch, and the proportional pressure reducing valve is located on the second oil inlet branch.

[0011] In this embodiment of the utility model, the second flow regulating valve is configured as a cartridge valve and has a third main oil port, a fourth main oil port, and a second control port. The hydraulic control device also includes a shuttle valve and a second directional valve. The shuttle valve has a first inlet, a second inlet, and an outlet. The first inlet of the shuttle valve is connected to the third main oil port, the second inlet of the shuttle valve is connected to the fourth main oil port, and the outlet of the shuttle valve is connected to the inlet of the second directional valve. The second directional valve is a two-position three-way directional valve and has a third working oil port. The third working oil port is connected to the second control port. The second directional valve is used to select one of the inlet and return ports of the second directional valve to connect to the third working oil port.

[0012] In this embodiment of the utility model, the hydraulic control device further includes a third directional valve and a first on / off valve disposed on the second oil inlet branch. The third directional valve is configured as a two-position three-way directional valve and has a fourth working oil port. The fourth working oil port is connected to the oil inlet of the proportional pressure reducing valve. The third directional valve is used to switch the fourth working oil port to be connected to the oil inlet of the third directional valve when energized, and to switch the fourth working oil port to be connected to the oil return port of the third directional valve when de-energized. The two oil ports of the first on / off valve are respectively connected to the oil outlet of the proportional pressure reducing valve and the oil inlet of the first directional valve.

[0013] In this embodiment of the utility model, the hydraulic control device further includes a direct-acting relief valve, which is connected in parallel with the third proportional relief valve.

[0014] In this embodiment of the invention, the hydraulic cylinder vibration and crawling detection system further includes two internal leakage detection devices. The two internal leakage detection devices are connected one-to-one with the rod chamber oil port and the rodless chamber oil port of the hydraulic cylinder under test. The internal leakage detection devices are used to detect the sealing condition of the rod chamber and the rodless chamber of the hydraulic cylinder under test.

[0015] Through the above technical solution, the hydraulic cylinder vibration and crawling detection system provided by this utility model embodiment has the following beneficial effects:

[0016] When using the aforementioned hydraulic cylinder vibration and crawling detection system, the hydraulic cylinder under test is placed on a test bench, and the piston rod of the first load cylinder and the hydraulic cylinder under test are connected. Then, the hydraulic control device is activated. The hydraulic control device includes a first flow regulating valve and a first proportional relief valve. By setting the first proportional relief valve, the pressure of the oil inlet circuits of the rodless chamber and the rod chamber of the first load cylinder can be controlled. Then, the first flow regulating valve controls the flow rate of hydraulic oil entering the rodless chamber and the rod chamber of the first load cylinder according to the pressure of the oil circuit, so that the first load cylinder can apply a constant horizontal load to the piston rod of the first load cylinder. During the extension or retraction of the piston rod of the first load cylinder, the detection device can detect the operation data of the piston rod. Based on the data obtained by the detection device, the severity of vibration and crawling of the hydraulic cylinder under test can be judged more accurately and intuitively, improving detection efficiency and reducing detection error.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1This is a schematic diagram of a hydraulic cylinder vibration and crawling detection system according to an embodiment of the present invention;

[0020] Figure 2 This is a control principle diagram of a hydraulic control device according to an embodiment of the present utility model;

[0021] Figure 3 This is a partial control principle diagram of the first load cylinder according to an embodiment of the present invention;

[0022] Figure 4 This is a partial control principle diagram of the hydraulic cylinder under test according to one embodiment of the present invention;

[0023] Figure 5 This is another part of the control principle diagram of the hydraulic cylinder under test according to one embodiment of the present invention.

[0024] Figure 6 This is a partial control principle diagram of the second load cylinder according to one embodiment of the present invention;

[0025] Figure 7 This is a control principle diagram of the pneumatic control component according to an embodiment of the present invention;

[0026] Figure 8 This is a control diagram of a hydraulic cylinder vibration and crawling detection system according to one embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures

[0028] 100 Test bench 200 Testing device

[0029] 300 First load cylinder 400 Second load cylinder

[0030] 401 First cylinder section 402 Second cylinder section

[0031] 403 First piston; 404 Second piston

[0032] 500 hydraulic cylinder under test; 600 hoisting frame

[0033] 700 Coupling 1 First Flow Control Valve

[0034] A1 First main oil port B1 Second main oil port

[0035] X1 First control port 2 First proportional overflow valve

[0036] 3 Second proportional relief valve 4 First directional valve

[0037] 5. Three-proportional relief valve; 6. First oil inlet branch.

[0038] 7 Second oil inlet branch; 8 Second flow regulating valve

[0039] A2 Third main oil port B2 Fourth main oil port

[0040] X2 Second Control Port 9 Proportional Pressure Reducing Valve

[0041] 10 Third directional valve 11 First on / off valve

[0042] 12 Direct-acting relief valve 13 Internal leakage detection device

[0043] 14 Check valve 16 Second directional valve

[0044] 17 First cover plate 18 Second cover plate

[0045] 19 High-pressure filter 20 Third cartridge valve

[0046] 21 Third cover plate 22 Turbine flow meter

[0047] 23 Vibration damper 24 Temperature sensor

[0048] 25 Pressure transmitter 27 Ball valve

[0049] 28 Tension / Compression Sensor 29 Displacement Sensor

[0050] 30 Pressure test connector 31 Filter

[0051] 32 Pressure gauge 33 Pressure sensor

[0052] 34 Electric ball valve 35 Heater

[0053] 36 Hydraulic pump 37 Motor

[0054] 38 Pneumatic control assembly 39 Pneumatic needle valve

[0055] 40 One-way throttle valve 41 Two-position three-way solenoid valve

[0056] 42 First pressure reducing valve 43 Second pressure reducing valve

[0057] 44 Pneumatically controlled directional valve 45 Second on / off valve Detailed Implementation

[0058] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0059] The hydraulic cylinder vibration and crawling detection system of this utility model is described below with reference to the accompanying drawings.

[0060] like Figures 1 to 8 As shown, this utility model provides a hydraulic cylinder vibration and crawling detection system, wherein the hydraulic cylinder vibration and crawling detection system includes:

[0061] Test bench 100 is used to fix the cylinder body of the hydraulic cylinder 500 to be tested;

[0062] The detection device 200 is used to detect the operating data of the piston rod of the hydraulic cylinder 500 under test;

[0063] The first load cylinder 300 can drive the piston rod of the hydraulic cylinder 500 under test to perform telescopic movement;

[0064] The hydraulic control device includes a first flow regulating valve 1 and a first proportional relief valve 2. The first flow regulating valve 1 is provided on the oil inlet lines of both the rodless chamber and the rod chamber of the first load cylinder 300, and the first proportional relief valve 2 is provided on the oil return lines of both the rodless chamber and the rod chamber of the first load cylinder 300. The first flow regulating valve 1 is used to adjust according to the set value and opening / closing state of the first proportional relief valve 2.

[0065] When using the aforementioned hydraulic cylinder vibration and crawling detection system, the hydraulic cylinder 500 under test is placed on the test bench 100, and the piston rod of the first load cylinder 300 and the hydraulic cylinder 500 under test are connected. Then, the hydraulic control device is started. The hydraulic control device includes a first flow regulating valve 1 and a first proportional relief valve 2. By setting the first proportional relief valve 2, the pressure of the oil inlet circuit of the rodless chamber and the rod chamber of the first load cylinder 300 can be controlled. Then, the first flow regulating valve 1 controls the flow rate of hydraulic oil entering the rodless chamber and the rod chamber of the first load cylinder 300 according to the pressure of the oil circuit, so that the first load cylinder 300 can apply a constant horizontal load to the piston rod of the first load cylinder 300. During the extension or retraction of the piston rod of the first load cylinder 300, the detection device 200 can detect the operation data of the piston rod. Based on the data obtained by the detection device 200, the severity of vibration and crawling of the hydraulic cylinder 500 under test can be judged more accurately and intuitively, improving detection efficiency and reducing detection error.

[0066] Specifically, see Figure 1 The hydraulic cylinder 500 under test and the first load cylinder 300 are connected by a coupling 700. The lower end of the coupling 700 is provided with rollers, which allows the coupling 700 to move along the table surface of the test bench 100. The coupling 700 can be used to transmit the load of the first load cylinder 300 to the hydraulic cylinder 500 under test, and can also provide temporary support for the piston rods of the hydraulic cylinder 500 under test and the first load cylinder 300.

[0067] Specifically, the detection device 200 includes a tension / compression sensor 28 and a displacement sensor 29.

[0068] like Figure 2 and Figure 3 As shown in the embodiment of this utility model, the first flow regulating valve 1 is a cartridge valve. The cartridge valve has a first main oil port A1, a second main oil port B1 and a first control port X1. The first control port X1 and the second main oil port B1 are connected and configured to regulate the flow rate from the first main oil port A1 to the second main oil port B1 according to the set value and opening / closing state of the first proportional relief valve 2. It is understandable that the cartridge valve can be used to regulate flow. The opening of the valve between the first main oil port A1 and the second main oil port B1 can be adjusted via the control port, thereby controlling the fluid flow. The valve opening is determined by the pressure at the control port. The proportional relief valve can control the oil circuit pressure. Therefore, through the cooperation of the first proportional relief valve 2 and the cartridge valve, the amount of hydraulic oil entering the rodless and rod chambers of the first load cylinder 300 can be controlled, creating a pressure difference between the rodless and rod chambers of the first load cylinder 300. This maintains a constant load on the first load cylinder 300 to the tested hydraulic cylinder 500, and the magnitude and direction of the load can be achieved by adjusting the opening of the two first proportional relief valves 2. Furthermore, the cartridge valve can also function as a check valve. If the pressure at the second main oil port B1 is greater than the pressure at the first main oil port A1, the hydraulic oil flows through the first control port X1 to the first main oil port A1, completely closing the valve between the first main oil port A1 and the second main oil port B1, preventing reverse flow of hydraulic oil.

[0069] Specifically, the first control port X1 of the first flow regulating valve 1 is connected to the second cover plate 18, and then the second main oil port B1 is connected through the second cover plate 18 and the pipeline.

[0070] Of course, this utility model is not limited to this. The flow regulating valve of this utility model can also be set as a throttling valve.

[0071] like Figure 2 and Figure 3 As shown in the embodiment of this utility model, the hydraulic control device further includes a second proportional relief valve 3. The two oil ports of the second proportional relief valve 3 are respectively connected to the oil inlet circuit and the oil return circuit of the first load cylinder 300. The second proportional relief valve 3 is used to control the maximum working pressure of the oil circuit of the first load cylinder 300 so as to avoid excessive pressure in the oil inlet circuit causing damage to other components.

[0072] Specifically, a pressure sensor 33 and a pressure gauge 32 are also provided at the oil inlet of the second proportional relief valve 3. The pressure sensor 33 is used to transmit the detection data to the corresponding controller or display device, while the pressure gauge 32 can be used by the test personnel for direct observation.

[0073] like Figure 1As shown in the embodiment of this utility model, the hydraulic cylinder vibration and crawling detection system further includes a second load cylinder 400. The test bench 100 includes a platform body and a lifting frame 600. The platform body allows for the hinged installation of the cylinder body of the hydraulic cylinder 500 under test and the cylinder body of the first load cylinder 300. The piston rods of the hydraulic cylinder 500 under test and the first load cylinder 300 are arranged facing each other and connected by a coupling 700. The lifting frame 600 allows for the lifting of the second load cylinder 400, so that the second load cylinder 400 is perpendicular to the hydraulic cylinder 500 under test, and the piston rod of the second load cylinder 400 can apply a force to the cylinder body of the hydraulic cylinder 500 under test. During actual operation, the hydraulic cylinder is subjected to loads in both the axial and radial directions. The second load cylinder 400 can apply a radial load to the hydraulic cylinder 500 under test. By cooperating with the first load cylinder 300, it simulates the actual working environment, making the obtained test data more reliable.

[0074] like Figure 2 , Figure 6 and Figure 7 As shown in the embodiment of this utility model, the cylinder body of the second load cylinder 400 includes a first cylinder section 401 and a second cylinder section 402 arranged sequentially. The piston rod of the second load cylinder 400 is provided with a first piston 403 and a second piston 404 at both ends. The first piston 403 is located in the first cylinder section 401, and the second piston 404 is located in the second cylinder section 402. The rodless chamber of the first cylinder section 401 is connected to the oil inlet passage and the oil return passage of the second load cylinder 400. The rod chamber and the rodless chamber of the second cylinder section 402 are both connected to a pneumatic control assembly 38. The pneumatic control assembly 38 is used to introduce gas into the rod chamber and / or the rodless chamber of the second cylinder section 402. By injecting hydraulic oil into the first cylinder section 401, a radial load can be applied to the hydraulic cylinder 500 under test. The load can be adjusted by the pneumatic control component 38. For example, introducing gas into the rod chamber of the second cylinder section 402 can increase the load, while introducing gas into the rodless chamber of the second cylinder section 402 can decrease the load. It is understood that the pressure of gas control is less than that of hydraulic control. Therefore, the load on the hydraulic cylinder 500 under test can be finely adjusted by the pneumatic control component 38, and the radial load on the hydraulic cylinder 500 under test can be controlled more accurately.

[0075] Specifically, the pneumatic control assembly 38 includes an air source and a pneumatic control directional valve 44, which is a two-position four-way valve to control the intake and exhaust of the rod chamber and rodless chamber of the second cylinder section 402.

[0076] Furthermore, a pneumatic needle valve 39 is provided on the oil return line of the first cylinder section 401. When the pneumatic needle valve 39 is closed, the first cylinder section 401 is in a pressure-holding state. When the pneumatic needle valve 39 is open, the first cylinder section 401 is depressurized. The control end of the pneumatic needle valve 39 is connected to the air source. A two-position three-way solenoid valve 41 and a one-way throttle valve 40 are also provided on the control pipeline between the pneumatic needle valve 39 and the air source to realize the control of the pneumatic needle valve 39.

[0077] like Figure 2 and Figure 4 As shown in the embodiment of this utility model, the hydraulic control device further includes a first directional valve 4 and a third proportional relief valve 5. The first directional valve 4 is a three-position four-way directional valve with a first working port and a second working port. The first working port is connected to the rod chamber oil circuit of the hydraulic cylinder 500 under test, and the second working port is connected to the rodless chamber oil circuit of the hydraulic cylinder 500 under test. The first directional valve 4 is used to select one of the first working port and the second working port to be connected to the inlet port of the first directional valve 4, and the other to be connected to the return port of the first directional valve 4. The two ports of the third proportional relief valve 5 are respectively connected to the inlet oil circuit and the return oil circuit of the first directional valve 4. The first directional valve 4 is used to control the oil inlet and outlet of the rod chamber and rodless chamber of the hydraulic cylinder under test, so as to realize the extension and retraction control of the hydraulic cylinder 500 under test. The third proportional relief valve 5 is used to control the pressure of the oil inlet circuit. By adjusting the third proportional relief valve 5, the piston rod of the hydraulic cylinder 500 under test can be made to move at different speeds, thereby simulating different operating conditions of the hydraulic cylinder under test, obtaining more complete test data, and improving the accuracy of the test.

[0078] like Figure 2 and Figure 4 As shown in this embodiment of the invention, the oil inlet circuit of the first directional valve 4 includes a first oil inlet branch 6 and a second oil inlet branch 7. The hydraulic control device also includes a second flow regulating valve 8 and a proportional pressure reducing valve 9. The second flow regulating valve 8 is located on the first oil inlet branch 6, and the proportional pressure reducing valve 9 is located on the second oil inlet branch 7. By selecting the corresponding oil inlet branch, the cylinder under test can have at least two different fluid inlet states to better simulate actual working conditions.

[0079] like Figure 2 and Figure 4As shown in the embodiment of this utility model, the second flow regulating valve 8 is configured as a cartridge valve and has a third main oil port A2, a fourth main oil port B2, and a second control port X2. The hydraulic control device also includes a shuttle valve 14 and a second directional valve 16. The shuttle valve 14 has a first inlet, a second inlet, and an outlet. The first inlet of the shuttle valve 14 is connected to the third main oil port A2, the second inlet of the shuttle valve 14 is connected to the fourth main oil port B2, and the outlet of the shuttle valve 14 is connected to the inlet of the second directional valve 16. The second directional valve 16 is a two-position three-way directional valve and has a third working oil port. The third working oil port is connected to the second control port X2. The second directional valve 16 is used to select one of the inlet and return ports of the second directional valve 16 to be connected to the third working oil port. The second directional valve 16 and shuttle valve 14 can control the function of the cartridge valve. For example, the third working port and the return port are connected, the second control port X2 is in a depressurized state, and the valve between the third main port A2 and the fourth main port B2 is fully open; the third working port and the inlet port are connected, and the second inlet and outlet of the shuttle valve 14 are connected, so that the second control port is connected to the fourth main port B2. At this time, in the first inlet branch 6, the hydraulic oil can only flow from the third main port A2 to the fourth main port B2; the third working port and the inlet port are connected, and the first inlet and outlet of the shuttle valve 14 are connected, so that the second control port is connected to the third main port A2, and the hydraulic oil can only flow from the fourth main port B2 to the third main port A2.

[0080] like Figure 2 and Figure 4 As shown in the embodiment of this utility model, the hydraulic control device further includes a third directional valve 10 and a first on / off valve 11 disposed on the second oil inlet branch 7. The third directional valve 10 is configured as a two-position three-way directional valve and has a fourth working oil port. The fourth working oil port is connected to the oil inlet of the proportional pressure reducing valve 9. The third directional valve 10 is used to switch the fourth working oil port to be connected to the oil inlet of the third directional valve 10 when energized, and to switch the fourth working oil port to be connected to the oil return port of the third directional valve 10 when de-energized. The two oil ports of the first on / off valve 11 are respectively connected to the oil outlet of the proportional pressure reducing valve 9 and the oil inlet of the first directional valve 4.

[0081] When the first on / off valve 11 is connected, the return port and the fourth working port of the third directional valve 10 are connected, and the third working port and the return port of the second directional valve 16 are connected, the pressure of the first oil inlet branch 6 can be adjusted by setting the set value of the proportional pressure reducing valve 9. When the first on / off valve 11 is connected, the return port and the fourth working port of the third directional valve 10 are connected, the third working port and the inlet port of the second directional valve 16 are connected, and the second inlet and outlet of the shuttle valve 14 are connected, the proportional pressure reducing valve 9 can be used to control the pressure at the second control port X2. The pressure and flow rate of the first oil inlet branch 6 can be adjusted by setting the set value of the proportional pressure reducing valve 9. When the first on / off valve 11 is connected, the inlet port and the fourth working port of the third directional valve 10 are connected, and the first inlet and outlet of the shuttle valve 14 are connected, the second oil inlet branch 7 is the only oil inlet of the hydraulic cylinder 500 under test. By controlling the second directional valve 16, the third directional valve 10, the shuttle valve 14, and the first on / off valve 11, different oil inlet conditions of the hydraulic cylinder 500 under test can be simulated to obtain the crawling and shaking data of the hydraulic cylinder 500 under different conditions, thereby better evaluating the performance of the hydraulic cylinder 500 under test.

[0082] like Figure 2 and Figure 5 As shown in this embodiment of the invention, the hydraulic control device further includes a direct-acting relief valve 12, which is connected in parallel with the third proportional relief valve 5. The direct-acting relief valve 12 serves a protective function, limiting the maximum pressure of the inlet oil circuit of the hydraulic cylinder 500 under test.

[0083] like Figure 2 As shown in this embodiment of the invention, the hydraulic cylinder vibration and crawling detection system further includes two internal leakage detection devices 13. These two devices 13 are connected one-to-one with the rod-side port and rodless-side port of the hydraulic cylinder 500 under test. The internal leakage detection devices 13 are used to detect the sealing condition of the rod-side and rodless-side ports of the hydraulic cylinder 500 under test. It is understood that for a well-sealed hydraulic cylinder, the liquid in the rod-side or rodless-side port cannot enter the other chamber. Therefore, when the internal leakage detection device 13 detects hydraulic oil, it indicates that the sealing structure of the piston rod of the hydraulic cylinder 500 under test has been damaged. Specifically, the internal leakage detection device 13 is preferably a transparent measuring cup, allowing the tester to directly observe and judge the sealing performance of the hydraulic cylinder 500 under test. Alternatively, the internal leakage detection device 13 can be configured as a liquid sensor, which can emit a detection signal after detecting hydraulic oil.

[0084] Specifically, see Figure 8 The hydraulic cylinder vibration and crawling detection system includes a 500-circuit hydraulic cylinder under test, a 300-circuit first load cylinder, and a 400-circuit second load cylinder. The circuits are described below along the hydraulic oil flow direction.

[0085] The hydraulic cylinder 500 circuit under test includes a main inlet line, a first inlet branch line 6, a second inlet branch line 7, a rod chamber oil circuit, a rodless chamber oil circuit, and a return oil circuit. The main inlet line is sequentially equipped with a filter 31, a ball valve 27, a vibration damper 23, a hydraulic pump 36, a third cartridge valve 20, a turbine flow meter 22, and the hydraulic pump 36 is driven by a motor 37. A third proportional relief valve 5, a straight-through relief valve, a pressure sensor 33, and a pressure gauge are connected to the pipeline between the filter 31 and the turbine flow meter 22. 32. The third cartridge valve is installed through the third cover plate 21; a cartridge valve serving as the second flow regulating valve 8 is provided on the first oil inlet branch 6, and the cartridge valve is installed on the first cover plate 17; a third directional valve 10, a proportional pressure reducing valve 9, and a first on / off valve 11 are sequentially provided on the second oil inlet branch 7; a ball valve 27, an internal leakage detection device 13, a temperature sensor 24, a pressure transmitter 25, and a pressure testing connector 30 are provided on both the rod chamber oil circuit and the rodless chamber oil circuit; a ball valve 27 and a filter 31 are provided on the return oil circuit.

[0086] The first load cylinder 300 circuit includes an oil inlet main line, a rod chamber oil line, a rodless chamber oil line, and a return oil line. The oil inlet main line is sequentially equipped with a filter 31, a ball valve 27, a vibration damper 23, a hydraulic pump 36, and a filter 31. The rod chamber oil line and the rodless chamber oil line are each equipped with a cartridge valve as a first flow regulating valve 1, a pressure sensor 33, and a pressure measuring connector 30. The oil inlet main line and the return oil line are connected by a second proportional relief valve 3, a pressure sensor 33, and a pressure gauge 32. The return oil line is connected to both the rod chamber oil line and the rodless chamber oil line by a first proportional relief valve 2.

[0087] The third load cylinder circuit includes an inlet oil circuit, a return oil circuit, a first air circuit, a second air circuit, and a third air circuit. The first air circuit is equipped with a second pressure reducing valve 43 and a pneumatic directional valve 44. The second air circuit is equipped with a first pressure reducing valve 42, a two-position three-way solenoid valve 41, and a one-way throttle valve 40, and is used to control the pneumatic needle valve 39. The second air circuit is also equipped with a two-position three-way solenoid valve 41 and a second shut-off valve 45, and is used to control the pneumatic directional valve 44.

[0088] Furthermore, this utility model also provides an oil pressure limit test bench, in which pipelines are connected to the rod chamber oil circuit and the rodless chamber oil circuit, and ball valves 27 are installed on the pipelines. The other end of the pipelines is connected to the rod chamber or rodless chamber of the hydraulic cylinder for pressure limit testing. A pneumatic needle valve 39 is installed on the return oil circuit of the hydraulic cylinder for pressure limit testing.

[0089] Furthermore, the hydraulic cylinder vibration and crawling detection system also includes a cooling circuit, on which a filter 31, a ball valve 27, a vibration damper 23, a hydraulic pump 36, a heater 35, a ball valve 27 and a filter 31 are arranged in sequence. The heater 35 has a heat exchange channel, which is connected to a cooling water source through an electric ball valve 34.

[0090] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0091] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0093] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic cylinder vibration and crawling detection system, characterized in that, The hydraulic cylinder vibration and crawling detection system includes: Test bench (100) is used to fix the cylinder body of the hydraulic cylinder (500) to be tested; The detection device (200) is used to detect the operating data of the piston rod of the hydraulic cylinder (500) under test; The first load cylinder (300) can drive the piston rod of the hydraulic cylinder under test (500) to perform telescopic movement; The hydraulic control device includes a first flow regulating valve (1) and a first proportional relief valve (2). The first flow regulating valve (1) is provided on the oil inlet lines of both the rodless chamber and the rod chamber of the first load cylinder (300). The first proportional relief valve (2) is provided on the oil return lines of both the rodless chamber and the rod chamber of the first load cylinder (300). The first flow regulating valve (1) is used to adjust according to the set value and opening / closing state of the first proportional relief valve (2).

2. The hydraulic cylinder vibration and crawling detection system according to claim 1, characterized in that, The first flow regulating valve (1) is a cartridge valve. The cartridge valve has a first main oil port (A1), a second main oil port (B1) and a first control port (X1). The first control port (X1) and the second main oil port (B1) are connected and used to regulate the flow from the first main oil port (A1) to the second main oil port (B1) according to the set value and opening / closing state of the first proportional relief valve (2).

3. The hydraulic cylinder vibration and crawling detection system according to claim 1, characterized in that, The hydraulic control device further includes a second proportional relief valve (3), the two ports of which are respectively connected to the oil inlet and oil return lines of the first load cylinder (300), and the second proportional relief valve (3) is used to control the maximum working pressure of the oil circuit of the first load cylinder (300).

4. The hydraulic cylinder vibration and crawling detection system according to claim 1, characterized in that, The hydraulic cylinder vibration and crawling detection system also includes a second load cylinder (400). The test bench (100) includes a platform body and a lifting frame (600). The platform body allows the cylinder body of the hydraulic cylinder under test (500) and the cylinder body of the first load cylinder (300) to be hingedly installed. The piston rod of the hydraulic cylinder under test (500) and the piston rod of the first load cylinder (300) are arranged facing each other and connected by a coupling (700). The lifting frame (600) allows the second load cylinder (400) to be lifted so that the second load cylinder (400) is perpendicular to the hydraulic cylinder under test (500), and the piston rod of the second load cylinder (400) can apply a force to the cylinder body of the hydraulic cylinder under test (500).

5. The hydraulic cylinder vibration and crawling detection system according to claim 4, characterized in that, The cylinder body of the second load cylinder (400) includes a first cylinder section (401) and a second cylinder section (402) arranged sequentially. The piston rod of the second load cylinder (400) is provided with a first piston (403) and a second piston (404) at both ends. The first piston (403) is located in the first cylinder section (401), and the second piston (404) is located in the second cylinder section (402). The rodless chamber of the first cylinder section (401) is connected to the oil inlet passage and the oil return passage of the second load cylinder (400). The rod chamber and the rodless chamber of the second cylinder section (402) are both connected to a pneumatic control assembly (38). The pneumatic control assembly (38) is used to introduce gas into the rod chamber and / or the rodless chamber of the second cylinder section (402).

6. The hydraulic cylinder vibration and crawling detection system according to claim 1, characterized in that, The hydraulic control device further includes a first directional valve (4) and a third proportional relief valve (5). The first directional valve (4) is a three-position four-way directional valve with a first working port and a second working port. The first working port is connected to the rod chamber oil circuit of the hydraulic cylinder under test (500), and the second working port is connected to the rodless chamber oil circuit of the hydraulic cylinder under test (500). The first directional valve (4) is used to select one of the first working port and the second working port to be connected to the inlet port of the first directional valve (4), and the other to be connected to the return port of the first directional valve (4). The two ports of the third proportional relief valve (5) are respectively connected to the inlet oil circuit and the return oil circuit of the first directional valve (4).

7. The hydraulic cylinder vibration and crawling detection system according to claim 6, characterized in that, The oil inlet circuit of the first directional valve (4) includes a first oil inlet branch (6) and a second oil inlet branch (7). The hydraulic control device also includes a second flow regulating valve (8) and a proportional pressure reducing valve (9). The second flow regulating valve (8) is located on the first oil inlet branch (6), and the proportional pressure reducing valve (9) is located on the second oil inlet branch (7).

8. The hydraulic cylinder vibration and crawling detection system according to claim 7, characterized in that, The second flow regulating valve (8) is configured as a cartridge valve and has a third main oil port (A2), a fourth main oil port (B2), and a second control port (X2). The hydraulic control device also includes a shuttle valve (14) and a second directional valve (16). The shuttle valve (14) has a first inlet, a second inlet, and an outlet. The first inlet of the shuttle valve (14) is connected to the third main oil port (A2), the second inlet of the shuttle valve (14) is connected to the fourth main oil port (B2), and the outlet of the shuttle valve (14) is connected to the inlet of the second directional valve (16). The second directional valve (16) is a two-position three-way directional valve and has a third working oil port. The third working oil port is connected to the second control port (X2). The second directional valve (16) is used to select one of the inlet and return ports of the second directional valve (16) to be connected to the third working oil port.

9. The hydraulic cylinder vibration and crawling detection system according to claim 7, characterized in that, The hydraulic control device further includes a third directional valve (10) and a first on / off valve (11) disposed on the second oil inlet branch (7). The third directional valve (10) is configured as a two-position three-way directional valve and has a fourth working port. The fourth working port is connected to the oil inlet of the proportional pressure reducing valve (9). The third directional valve (10) is used to switch the fourth working port to be connected to the oil inlet of the third directional valve (10) when energized, and to switch the fourth working port to be connected to the oil return port of the third directional valve (10) when de-energized. The two ports of the first on / off valve (11) are respectively connected to the oil outlet of the proportional pressure reducing valve (9) and the oil inlet of the first directional valve (4).

10. The hydraulic cylinder vibration and crawling detection system according to claim 6, characterized in that, The hydraulic control device also includes a direct-acting relief valve (12), which is connected in parallel with the third proportional relief valve (5); And / or, the hydraulic cylinder vibration and crawling detection system further includes two internal leakage detection devices (13), which are connected one-to-one with the rod chamber oil port and the rodless chamber oil port of the hydraulic cylinder under test (500). The internal leakage detection devices (13) are used to detect the sealing condition of the rod chamber and the rodless chamber of the hydraulic cylinder under test (500).

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