Hydraulic test platform for fatigue test of hydraulic oil cylinder

Abstract

A hydraulic test platform for fatigue test of a hydraulic oil cylinder belongs to the technical field of oil cylinder test. Which comprises a fixed seat (5) used for installing a to-be-tested oil cylinder (7) and a hydraulic mechanism connected with the to-be-tested oil cylinder (7) and used for driving the to-be-tested oil cylinder (7) to act, and is characterized in that a load hydraulic cylinder is fixed on one side of the to-be-tested oil cylinder (7), and a piston rod of the load hydraulic cylinder and a piston rod of the to-be-tested oil cylinder (7) are fixed at the same position; a hydraulic port of the load hydraulic cylinder is connected with the load oil tank (3), and a flow limiting mechanism with adjustable flow is arranged on a connecting pipeline of the hydraulic port of the load hydraulic cylinder and the load oil tank (3). In the hydraulic test platform for the fatigue test of the hydraulic oil cylinder, the hydraulic cylinder is used as a load of the oil cylinder to be tested, and the flow velocity of oil in the hydraulic cylinder is controlled through the throttling mechanism, so that the complexity of the system is reduced while the load is adjustable, and the difficulty of load adjustment is simplified.

Description

Technical Field

[0001] The invention discloses a hydraulic test platform for fatigue testing of a hydraulic oil cylinder, belonging to the technical field of oil cylinder testing. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It is a key component of an electro-hydraulic operating table, and its stability directly impacts its service life and failure rate. Therefore, prior to assembling the operating table, it is crucial to determine the stability of the hydraulic cylinder, and fatigue testing is a key indicator of this stability.

[0003] Some existing fatigue testing schemes for cylinders rely solely on the hydraulic system to drive the cylinders back and forth. This testing method fails to consider the load conditions experienced by the cylinders during actual use, making the test results less accurate than the cylinders' actual performance. Other existing solutions apply loads to the cylinders during testing to improve test reliability. These solutions fall into the following categories:

[0004] (1) The technical solution disclosed in the Chinese utility model patent application number 202323347738.9, filed on December 8, 2023, and entitled “A High-Precision Fatigue Test Bench” utilizes a spring as a load applied to the cylinder to be tested. The drawback of this testing method is that the load strength cannot be changed.

[0005] (2) In the technical solutions disclosed in the Chinese utility model patent with application number 202223275913.3, application date December 7, 2022, and patent name “A fatigue test bench”; the Chinese invention patent with application number 202210308555.7, application date March 28, 2022, and patent name “A hydraulic cylinder fatigue performance test equipment and test method”; the Chinese invention patent with application number 202111132236.7, application date October 29, 2021, and patent name “Cylinder fatigue test machine”; and the Chinese invention patent with application number 202411265591.5, application date September 10, 2024, and patent name “A hydraulic cylinder fatigue performance test equipment”, the idea is to set different counterweights at the piston rod of the cylinder to be tested, and realize the change of load by changing the counterweights. Although this method can achieve load changes, the load change range is limited and the labor intensity of the test process is greatly increased.

[0006] (3) The technical solutions disclosed in the invention patent application number 201410085518.X, filed on March 10, 2014, and entitled “A Fatigue Testing Method and Ambition for Hydraulic Cylinders” and the Chinese invention patent application number 202320028384.2, filed on January 6, 2023, and entitled “Load Fatigue Test Platform for Cylinder Seals” utilize oil pressure as a load applied to the cylinder to be tested. This approach achieves load adjustment and reduces manual labor intensity, but its implementation requires the installation of electric components such as oil pumps or electro-hydraulic servo valves, which greatly increases the complexity of the system. Utility Model Content

[0007] The technical problem to be solved by the utility model is: to overcome the deficiencies of the existing technology and provide a hydraulic test platform for fatigue testing of hydraulic cylinders, which utilizes a hydraulic cylinder as the load of the cylinder to be tested and controls the flow rate of the hydraulic cylinder oil through a throttling mechanism, thereby achieving load adjustment while reducing the complexity of the system and simplifying the difficulty of load adjustment.

[0008] The technical solution adopted by the utility model to solve its technical problems is: the hydraulic test platform for fatigue testing of hydraulic cylinders includes a fixing seat for installing the cylinder to be tested, and is also provided with a hydraulic mechanism connected to the cylinder to be tested and used to drive the cylinder to be tested to move. The characteristics are: a load hydraulic cylinder is fixed on one side of the cylinder to be tested, the piston rod of the load hydraulic cylinder and the piston rod of the cylinder to be tested are fixed at one place, and are driven to move by the piston rod of the cylinder to be tested, the hydraulic port of the load hydraulic cylinder is connected to the load oil tank, and a flow-adjustable flow limiting mechanism is provided on the connecting pipeline between the hydraulic port of the load hydraulic cylinder and the load oil tank.

[0009] Preferably, the load hydraulic cylinder is a load oil cylinder installed on both sides of the oil cylinder to be tested, the flow limiting mechanism is installed on the surface of the load oil tank, and the oil port of the load oil cylinder is connected to the load oil tank through the flow limiting mechanism.

[0010] Preferably, the flow limiting mechanism is a throttle valve installed on the surface of the load oil tank.

[0011] Preferably, the cylinder body of the load hydraulic cylinder is fixed on the surface of the fixing seat, and the cylinder body of the oil cylinder to be tested is movably connected to the fixing seat.

[0012] Preferably, a casing is provided, a fixing seat is fixed on the surface of the casing, the load oil tank is located on one side of the fixing seat, and a first pressure gauge and a second pressure gauge are provided on the other side of the fixing seat. The first pressure gauge and the second pressure gauge are installed on the connecting pipeline between the oil cylinder to be tested and the hydraulic mechanism.

[0013] Preferably, a synchronous seat is provided, which is arranged opposite to the fixed seat, and the piston rod of the load hydraulic cylinder and the piston rod of the oil cylinder to be tested are connected to the synchronous seat at the same time.

[0014] Preferably, the housing includes a bottom housing and an upper cover, the upper cover is installed at the upper end of the bottom housing in an openable and closable manner via a hinge, and the upper cover and the bottom housing are connected via an internal support rod.

[0015] Preferably, the hydraulic mechanism includes a hydraulic pump and a solenoid valve disposed in the bottom shell, and the hydraulic pump is connected to the oil port of the oil cylinder to be tested through the solenoid valve.

[0016] Preferably, an opening is provided on the surface of the upper cover, and a pipeline connecting the solenoid valve and the oil cylinder to be tested passes through the opening.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the hydraulic test platform for hydraulic cylinder fatigue testing, the hydraulic cylinder is used as the load of the cylinder to be tested, and the flow rate of the hydraulic cylinder oil is controlled by a throttling mechanism, which realizes load adjustment while reducing the complexity of the system and simplifying the difficulty of load adjustment.

[0019] Through the hydraulic test platform for hydraulic cylinder fatigue testing, the load borne by the tested cylinder during actual operation can be simulated, thereby restoring the load borne by the tested cylinder during actual operation, making the service life and other data obtained from the fatigue test more accurate.

[0020] The oil cylinder to be tested is detachably mounted between the fixing seat and the synchronous seat, so that different types of oil cylinders to be tested can be easily replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Top view of the hydraulic test platform for fatigue testing of hydraulic cylinders.

[0022] Figure 2 Schematic diagram of the internal structure of the hydraulic test platform after the upper cover is opened for hydraulic cylinder fatigue testing.

[0023] Figure 3 Schematic diagram of the pipeline connection of the hydraulic test platform for hydraulic cylinder fatigue testing.

[0024] Among them: 1. Hinge 2. Upper cover 3. Load oil tank 4. Throttle valve 5. Fixed seat 6. Articulated seat 7. Cylinder to be tested 8. Load oil cylinder 9. First pressure gauge 10. Second pressure gauge 11. Synchronous seat 12. Opening 13. Support rod 14. Bottom shell 15. Support seat 16. Control circuit 17. Hydraulic pump 18. Power supply 19. Solenoid valve 20. Oil pipe 21. Main oil tank. DETAILED DESCRIPTION

[0025] Figures 1-3 This is the best embodiment of the present invention, Figures 1-3The utility model is further described.

[0026] like Figures 1 and 2 As shown, a hydraulic test platform for fatigue testing of hydraulic cylinders (hereinafter referred to as the test platform) includes a housing, which comprises a bottom shell 14 with an open top and an upper cover 2. The upper cover 2 is arranged at the upper end of the bottom shell 14 and can be opened and closed by a hinge 1 at one end. Support bases 15 are provided on the inner surfaces of the bottom shell 14 and the upper cover 2, respectively. A support rod 13 is installed between the upper and lower support bases 15. The support rod 13 is realized by a hydraulic rod commonly used in the art to provide support when the upper cover 2 is opened.

[0027] A fixing seat 5 is provided on the upper surface of the upper cover 2. The fixing seat 5 includes two end faces perpendicular to each other, wherein the horizontal end face is fixed to the surface of the upper cover 2, and the vertical end face is perpendicular to the surface of the upper cover 2. A hinge seat 6 is provided in the middle of the vertical end face of the fixing seat 5. The cylinder body of the cylinder to be tested 7 is movably mounted on the hinge seat 6. A load cylinder 8 is also provided on both sides of the hinge seat 6. The cylinder body of the load cylinder 8 is fixed to the vertical end face of the fixing seat 5. The cylinder to be tested 7 and the load cylinders 8 on both sides are arranged in parallel, and the piston rods of the cylinder to be tested 7 and the load cylinders 8 on both sides face the same side. A synchronization seat 11 is provided at the end of the piston rod of the cylinder to be tested 7 and the load cylinders 8 on both sides. The piston rods of the cylinder to be tested 7 and the load cylinders 8 on both sides are hinged to the synchronization seat 11 at the same time.

[0028] A load oil tank 3 is also provided on the surface of the upper cover 2. Hydraulic oil is placed in the load oil tank 3. A plurality of throttle valves 4 are arranged side by side on the surface of the load oil tank 3. Figure 3 Each group of two throttle valves 4 is connected to the oil port of the corresponding load cylinder 8 via an oil pipe 20. By adjusting the opening of the throttle valve 4, the pressure required for the hydraulic oil to enter and exit the load tank 3 can be controlled, thereby adjusting the force required to move the piston rod of the load cylinder 8.

[0029] Inside the bottom housing 14, a power supply 18, a control circuit 16, and a hydraulic pump 17 are arranged side by side. A solenoid valve 19 is also located next to the power supply 18. The power supply 18 provides operating power to the control circuit 16 and the hydraulic pump 17. The control circuit 16 includes a controller, a drive circuit that activates the solenoid valve 19, and a switching device (such as a relay) that controls the on / off voltage supply to the hydraulic pump 17. A drive button connected to the controller is also located on the end face of the bottom housing 14 to control the start and end of the test process.

[0030] Solenoid valve 19 is implemented as a two-position, four-way solenoid directional valve. The oil outlet of hydraulic pump 17 is connected to the oil inlet of solenoid valve 19 via a pipeline. The oil return port of solenoid valve 19 is connected to the main oil tank 21. The valve core in solenoid valve 19 is controlled on and off by control circuit 16. A through-opening 12 is also provided on the surface of upper cover 2. Two oil pipes 20 extending from the oil outlet of solenoid valve 19 pass through opening 12 and connect to the oil port of the test cylinder 7. The specific piping connection method that connects the hydraulic system (including but not limited to hydraulic pump 17, oil pipes 20, and solenoid valve 19) to the cylinder and drives the reciprocating motion of the cylinder's piston rod is common knowledge in the art and will not be elaborated here.

[0031] A first pressure gauge 9 and a second pressure gauge 10 are respectively installed on the oil pipe 20 connecting the solenoid valve 19 and the test cylinder 7. These pressure gauges monitor the oil pressure in the two oil passages 20 that drive the reciprocating motion of the piston rod of the test cylinder 7. The gauge heads of the first and second pressure gauges 9, 10 extend through the upper cover 2 and are located on the upper surface of the upper cover 2.

[0032] The specific working process and working principle are as follows:

[0033] Install the cylinder body and piston rod of the test cylinder 7 on the hinge seat 6 and the synchronization seat 11, respectively. Connect the oil pipe to the oil port of the test cylinder 7. Then adjust the opening of the throttle valve 4 on the surface of the load cylinder 8 to adjust the load provided by the load cylinder 8.

[0034] Press the start button to start the test. Once the test begins, the control circuit 16 controls the hydraulic pump 17, pumping the hydraulic oil from the main oil tank 21 into the inlet of the solenoid valve 19. The control circuit 16 switches the oil circuit by controlling the movement of the valve core in the solenoid valve 19, circulating the hydraulic oil pumped by the hydraulic pump 17 into the oil port of the test cylinder 7. This drives the piston rod of the test cylinder 7 to release and reset.

[0035] As the piston rod of the test cylinder 7 is released and reset, it simultaneously drives the synchronizer seat 11 to drive the piston rods of the load cylinders 8 on either side. Driven by the test cylinder 7, the piston rod of the load cylinder 8 reciprocates, discharging hydraulic oil into the load tank 3 and simultaneously withdrawing hydraulic oil from the load tank 3. As the hydraulic oil flows between the load cylinder 8 and the load tank 3, it passes through the throttle valve 4, which provides the load applied to the test cylinder 7 during its operation. This simulates the working environment of the test cylinder 7, thereby performing a fatigue test on the test cylinder 7. After the test cylinder 7 has completed a certain number of operation cycles, the control circuit 16 controls the test to end.

[0036] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A hydraulic test platform for fatigue testing of a hydraulic cylinder, comprising a fixing seat (5) for mounting a cylinder (7) to be tested, and a hydraulic mechanism connected to the cylinder (7) to be tested and used to drive the cylinder (7) to be tested, characterized in that: A load hydraulic cylinder is fixed on one side of the oil cylinder to be tested (7). The piston rod of the load hydraulic cylinder and the piston rod of the oil cylinder to be tested (7) are fixed at one place and are driven to move by the piston rod of the oil cylinder to be tested (7). The hydraulic port of the load hydraulic cylinder is connected to the load oil tank (3). A flow-adjustable flow limiting mechanism is provided on the connecting pipeline between the hydraulic port of the load hydraulic cylinder and the load oil tank (3).

2. The hydraulic testing platform for hydraulic cylinder fatigue testing according to claim 1, characterized in that: The load hydraulic cylinder is a load oil cylinder (8) installed on both sides of the oil cylinder to be tested (7), the flow limiting mechanism is installed on the surface of the load oil tank (3), and the oil port of the load oil cylinder (8) is connected to the load oil tank (3) through the flow limiting mechanism.

3. The hydraulic test platform for fatigue testing of hydraulic cylinders according to claim 1 or 2, characterized in that: The flow limiting mechanism is a throttle valve (4) mounted on the surface of the load oil tank (3).

4. The hydraulic test platform for fatigue testing of hydraulic cylinders according to claim 1 or 2, characterized in that: The cylinder body of the load hydraulic cylinder is fixed on the surface of the fixing seat (5), and the cylinder body of the oil cylinder to be tested (7) is movably connected to the fixing seat (5).

5. The hydraulic testing platform for fatigue testing of hydraulic cylinders according to claim 1, characterized in that: A housing is provided, a fixing seat (5) is fixed on the surface of the housing, a load oil tank (3) is located on one side of the fixing seat (5), and a first pressure gauge (9) and a second pressure gauge (10) are provided on the other side of the fixing seat (5). The first pressure gauge (9) and the second pressure gauge (10) are installed on the connecting pipeline between the oil cylinder (7) to be tested and the hydraulic mechanism.

6. The hydraulic testing platform for fatigue testing of hydraulic cylinders according to claim 1, characterized in that: A synchronous seat (11) is provided, and the synchronous seat (11) is arranged opposite to the fixed seat (5). The piston rod of the load hydraulic cylinder and the piston rod of the oil cylinder to be tested (7) are connected to the synchronous seat (11) at the same time.

7. The hydraulic testing platform for fatigue testing of hydraulic cylinders according to claim 5, characterized in that: The housing comprises a bottom housing (14) and an upper cover (2). The upper cover (2) is mounted on an upper end of the bottom housing (14) via a hinge (1) so as to be openable and closable. The upper cover (2) and the bottom housing (14) are connected via an internal support rod (13).

8. The hydraulic testing platform for fatigue testing of hydraulic cylinders according to claim 7, characterized in that: The hydraulic mechanism comprises a hydraulic pump (17) and a solenoid valve (19) arranged in the bottom shell (14); the hydraulic pump (17) is connected to the oil port of the oil cylinder (7) to be tested via the solenoid valve (19).

9. The hydraulic testing platform for fatigue testing of hydraulic cylinders according to claim 8, characterized in that: An opening (12) is provided on the surface of the upper cover (2), and a pipeline connecting the solenoid valve (19) and the oil cylinder (7) to be tested passes through the opening (12).

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