A hydraulic station for automobile spring endurance test

Abstract

The utility model discloses a kind of automobile spring endurance test hydraulic station, belong to automobile spring test equipment technical field, the hydraulic station includes oil tank, axial plunger pump, control valve block, upper hydraulic motor control circuit, lower hydraulic motor control circuit and cooling circuit;Control valve block contains overflow valve, solenoid valve etc., realizes pressure control;Double hydraulic motor control circuit is in parallel, through upper and lower hydraulic motor cooperative action, clamps and tests to automobile spring;Cooling circuit is cooled to hydraulic oil.The hydraulic station is through multiple components cooperation, realizes pressure accurate control, real working condition simulation, with low energy consumption, high safety simultaneously, suitable for automobile spring endurance test.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive spring testing equipment, specifically a hydraulic station for automotive spring durability testing. Background Technology

[0002] The durability of automotive springs directly affects vehicle driving safety and comfort; therefore, fatigue testing is required to verify their strength and lifespan before they leave the factory. Current technologies primarily employ mechanical transmission equipment or simple hydraulic equipment for spring durability testing, which suffers from the following drawbacks: Mechanized testing equipment relies on gears, cams, and other mechanical transmission structures, resulting in unstable pressure output and an inability to achieve high-frequency operation, failing to simulate the continuous stress conditions experienced by a vehicle during bumpy rides, and leading to long testing cycles; simple hydraulic equipment lacks precise pressure and flow control mechanisms, resulting in large pressure fluctuations, low testing efficiency, and, more importantly, an inability to simulate real bidirectional stress conditions.

[0003] To solve the above problems, there is an urgent need for a hydraulic testing device that can achieve stable pressure control, high-frequency working condition simulation, accurate reproduction of real stress state, and high efficiency and energy saving. Utility Model Content

[0004] To address the shortcomings of existing testing equipment, such as unstable pressure, low testing efficiency, inaccurate simulation of working conditions, and high energy consumption, this utility model provides a hydraulic station for testing the durability of automotive springs. It achieves precise pressure control, simulates real bidirectional force and actual driving conditions through the coordinated operation of upper and lower motors, and reduces energy consumption.

[0005] A hydraulic station for testing the durability of automotive springs, comprising:

[0006] The oil tank stores oil and is equipped with a main return oil passage and a main outlet oil passage.

[0007] An axial piston pump with its inlet end connected to an oil tank to provide power;

[0008] The control valve block controls the oil pressure, and its inlet end is connected to the outlet end of the axial piston pump.

[0009] The upper hydraulic motor control circuit and the lower hydraulic motor control circuit are connected in parallel between the main return oil circuit and the main output oil circuit, and are used to control the hydraulic motor to test the car spring.

[0010] The cooling circuit, installed on the oil tank, is used to cool the hydraulic oil inside the tank.

[0011] As a preferred embodiment of this utility model, a first pressure filter is connected to the main oil outlet line between the axial piston pump and the control valve block; a second pressure filter is installed on the oil inlet line of the upper hydraulic motor control circuit.

[0012] As a preferred embodiment of this utility model, the control valve block includes a first relief valve and an LS feedback loop connected to the axial piston pump. The inlet of the first relief valve is connected to the main oil outlet circuit, and the outlet is connected to the main oil return circuit. A first two-position two-way solenoid valve and a two-position four-way solenoid directional valve are inserted into the control valve block. The first two-position two-way solenoid valve is connected between the main oil return circuit and the main oil outlet circuit. The two-position four-way solenoid directional valve is connected between the LS feedback loop and the main oil return circuit. A second relief valve is also connected between the LS feedback loop and the oil tank.

[0013] As a preferred embodiment of this utility model, the control valve block is also connected to a pressure sensor, an accumulator and a pressure gauge.

[0014] As a preferred embodiment of this utility model, the upper hydraulic motor control circuit includes an upper motor, a first proportional directional valve connected in series with the upper motor, and a second two-position two-way solenoid valve connected in parallel with the upper motor; an oil drain circuit is also connected between the upper motor and the oil tank.

[0015] As a preferred embodiment of this utility model, the lower hydraulic motor control circuit includes a lower motor and a second proportional directional valve connected in series with the lower motor; a third two-position two-way solenoid valve is connected in series on the return oil line of the lower motor, and a fourth two-position two-way solenoid valve is connected in series on the inlet oil line of the lower motor; an oil drain circuit is also connected between the lower motor and the oil tank.

[0016] As a preferred embodiment of this utility model, the cooling circuit includes a vane pump, the oil inlet of the vane pump is connected to an oil tank, the oil outlet is connected to an air cooler, the oil outlet of the air cooler is connected to a return oil filter, and the oil outlet of the return oil filter is connected to the oil tank.

[0017] As a preferred embodiment of this utility model, the oil tank is also equipped with a level gauge, a level switch, a temperature sensor and an air filter.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects:

[0019] This invention utilizes a PLC, pressure sensor, and proportional directional valve to form a closed-loop control system, resulting in minimal pressure control error. Combined with LS feedback, the pump output pressure is consistently higher than the load pressure, preventing pressure fluctuations. The upper and lower hydraulic motors are connected in parallel and can be controlled collaboratively or independently, creating a clamping force on the spring. Combined with the high-frequency response of the proportional directional valve, it can simulate reciprocating impact conditions, shortening the testing cycle and improving performance. Components such as the relief valve provide dual safety protection, preventing overpressure or blockage malfunctions. The forward and reverse rotation frequency and speed of the hydraulic motors are adjustable, accurately replicating the force scenarios such as bumps and steering experienced during vehicle operation. Attached Figure Description

[0020] Figure 1 This is a diagram of the overall hydraulic system of this utility model;

[0021] Figure 2 This is a schematic diagram of the control valve block of this utility model;

[0022] Figure 3 This is a schematic diagram of the upper hydraulic motor control circuit of this utility model;

[0023] Figure 4 This is a schematic diagram of the lower hydraulic motor control circuit of this utility model;

[0024] Figure 5 This is a schematic diagram of the cooling circuit of this utility model;

[0025] Figure 6 This is a three-dimensional front view of the hydraulic station of this utility model;

[0026] Figure 7 This is a three-dimensional schematic diagram of the back of the hydraulic station of this utility model.

[0027] In the diagram: 1. Oil tank; 2. Axial piston pump; 3. Control valve block; 301. First relief valve; 302. Second relief valve; 303. First two-position two-way solenoid valve; 304. Two-position four-way solenoid directional valve; 305. Pressure sensor; 306. Accumulator; 4. Main oil outlet circuit; 5. Upper hydraulic motor control circuit; 501. Upper motor; 502. Second two-position two-way solenoid valve; 503. First proportional directional valve; 6. Lower hydraulic motor control circuit; 601. Lower motor; 602. Third two-position two-way solenoid valve; 603. Fourth two-position two-way solenoid valve; 604. Second proportional directional valve; 7. Main return oil circuit; 8. Drain circuit; 9. Cooling circuit; 901. Vane pump; 902. Air cooler; 903. Return oil filter; 10. First pressure filter; 11. Second pressure filter. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Example 1

[0030] like Figures 1 to 7 As shown, a specific embodiment of the hydraulic station for testing the durability of automotive springs according to this utility model includes:

[0031] Oil tank 1: Used to store hydraulic oil and provide oil source for the entire hydraulic system. Oil tank 1 is equipped with main return oil line 7 and main outlet oil line 4. At the same time, oil tank 1 is also equipped with a level gauge, level switch, temperature sensor and air filter. The level gauge and level switch are used to monitor the level of hydraulic oil in oil tank 1, the temperature sensor is used to monitor the temperature of hydraulic oil, and the air filter is used to filter the air entering oil tank 1 to prevent impurities from mixing into the hydraulic oil.

[0032] Axial piston pump 2: As the power source of the hydraulic system, its oil inlet end is connected to the oil tank 1 to draw hydraulic oil from the oil tank 1, and its oil outlet end is connected to the main oil outlet circuit 4 through a pipeline to provide high-pressure oil to the entire hydraulic system and provide power for the system operation.

[0033] Control valve block 3: Used to control the oil circuit pressure of the entire hydraulic system and ensure system pressure stability; control valve block 3 includes a first relief valve 301 and an LS feedback circuit connected to the axial piston pump 2. The inlet of the first relief valve 301 is connected to the main oil outlet circuit 4, and the outlet is connected to the main return oil circuit 7. When the system pressure exceeds the set value, the first relief valve 301 opens to discharge excess hydraulic oil back to the oil tank 1, providing a safety protection function; a first two-position two-way solenoid valve 303 and a two-position four-way solenoid directional valve 304 are inserted on the control valve block 3. The first two-position two-way solenoid valve 303 is connected between the main return oil circuit and the main oil outlet circuit to control the on / off state between the main return oil circuit and the main oil outlet circuit; the two-position four-way solenoid directional valve 304 is connected to the main return oil circuit and the main oil outlet circuit. In the LS feedback loop, when energized, the LS loop is connected to the oil tank 1. A second relief valve 302 is also connected between the LS feedback loop and the oil tank 1. The second relief valve 302 is used to further ensure the pressure stability of the LS feedback loop and prevent excessive pressure from damaging related components. In addition, a pressure sensor 305, an accumulator 306, and a pressure gauge are also connected to the control valve block 3. The pressure sensor 305 is used to collect the system oil circuit pressure in real time and transmit the pressure signal to the subsequent control system. When the pump is unloaded or there is a response delay, the accumulator 306 provides instantaneous flow replenishment to the proportional valve to ensure control accuracy and system pressure stability. The pressure gauge is used to visually display the system oil circuit pressure for easy observation by operators.

[0034] Upper hydraulic motor control circuit 5 and lower hydraulic motor control circuit 6: Both are connected in parallel between the main return oil circuit and the main outlet oil circuit, used to control the hydraulic motor to test the automotive springs. Upper hydraulic motor control circuit 5 includes an upper motor 501, a first proportional directional valve 503 connected in series with the upper motor 501, and a second two-position two-way solenoid valve 502 connected in parallel with the upper motor 501. The first proportional directional valve 503 controls the flow direction and flow rate of the oil entering the upper motor 501, thereby controlling the rotation direction and speed of the upper motor 501. The second two-position two-way solenoid valve 502 controls the opening and closing of the oil circuit of the upper motor 501 under specific operating conditions. An oil drain circuit 8 is also connected between the upper motor 501 and the oil tank 1 to drain the oil generated during the operation of the upper motor 501. Leaking oil is drained back into oil tank 1; the lower hydraulic motor control circuit 6 includes a lower motor 601 and a second proportional directional valve 604 connected in series with the lower motor 601. The second proportional directional valve 604 is the same model as the first proportional directional valve 503 and is used to control the flow direction and flow rate of the oil entering the lower motor 601, thereby controlling the rotation direction and speed of the lower motor 601; a third two-position two-way solenoid valve 602 is connected in series on the return oil line of the lower motor 601, and a fourth two-position two-way solenoid valve 603 is connected in series on the inlet oil line. The third two-position two-way solenoid valve 602 and the fourth two-position two-way solenoid valve 603 are used to control the opening and closing of the inlet and return oil lines of the lower motor 601; a drain circuit 8 is also connected between the lower motor 601 and the oil tank 1 to drain the leaking oil from the lower motor 601 back into the oil tank 1;

[0035] Cooling circuit 9: Installed on oil tank 1, it is used to cool the hydraulic oil in oil tank 1 and ensure that the hydraulic oil is at a suitable working temperature. Cooling circuit 9 includes vane pump 901. The oil inlet of vane pump 901 is connected to oil tank 1, and the oil outlet is connected to air cooler 902. The oil outlet of air cooler 902 is connected to return oil filter 903, and the oil outlet of return oil filter 903 is connected to oil tank 1. During operation, vane pump 901 draws hydraulic oil from oil tank 1 and delivers it to air cooler 902. After the hydraulic oil is cooled by air cooler 902, it passes through return oil filter 903 to filter impurities and finally flows back to oil tank 1, thus achieving cooling and purification of hydraulic oil.

[0036] Preferably, the hydraulic station also includes a first pressure filter 10 and a second pressure filter 11. The first pressure filter 10 is connected to the main oil outlet line between the axial piston pump 2 and the control valve block 3, and is used to filter impurities in the hydraulic oil output from the axial piston pump 2 to prevent impurities from entering the control valve block 3 and damaging related components. The second pressure filter 11 is installed in the oil inlet line of the upper hydraulic motor control circuit 5, and is used to filter impurities in the hydraulic oil entering the upper hydraulic motor control circuit 5 to ensure the normal operation of components such as the upper motor 501.

[0037] The oil tank is made of stainless steel and has a capacity of 500L; the axial piston pump is model A10VSO18DR with a rated pressure of 31.5MPa, connected to an 11kW three-phase asynchronous motor via a coupling; the pressure filter uses a 5μm glass fiber filter element, and the return oil filter uses a 10μm metal mesh filter element, both equipped with a differential pressure signal device to set the differential pressure to 0.3MPa; the proportional directional valve is model 4WRAE6W15-2X / G24K31 / F1V, the two-position two-way solenoid valve is model SV10PA2-3X, the first relief valve is set to a pressure of 170bar, and the second relief valve is set to a pressure of 150bar; the hydraulic motor is model OMM16 with a rated speed of 3000r / min, and the output shaft is connected to a spring test fixture via a flexible coupling; the PLC control system is a Siemens S7-1200 series.

[0038] The working principle of this utility model is as follows: When the equipment is started, the axial piston pump 2 starts to work and draws hydraulic oil from the oil tank 1. After the hydraulic oil passes through the first pressure filter 10 to filter impurities, it enters the control valve block 3.

[0039] Under the action of control valve block 3, the pressure of hydraulic oil is regulated; pressure sensor 305 collects system pressure in real time and transmits the pressure signal to the control system. When the system pressure exceeds the set value, the first relief valve 301 opens to drain excess hydraulic oil back to the oil tank 1; the LS feedback loop is used to feed back the system load pressure to the axial piston pump 2; when the two-position four-way solenoid directional valve 304 is de-energized, the load pressure signal is normally fed back to the pump, and the pump works normally; when the valve is energized, the LS loop is connected to the oil tank, and the pump senses the zero load pressure and enters the unloading state, thereby achieving energy saving;

[0040] The regulated hydraulic oil can enter the upper hydraulic motor control circuit 5 and the lower hydraulic motor control circuit 6 separately or simultaneously according to control commands. During the test, the upper motor 501 (driving the upper pressure plate) and the lower motor 601 (driving the lower pressure plate) work together to precisely compress, release, or perform high-frequency reciprocating motion on the automotive spring placed between them, simulating the complex loads it experiences in actual use. The two circuits work together at one test station to achieve dynamic durability testing of a single spring. In the upper hydraulic motor control circuit 5, the first proportional directional valve 503 controls the flow direction and flow rate of the hydraulic oil, driving the upper motor 501 to rotate according to the set direction and speed, thereby driving the spring test fixture connected to the upper motor 501. The upper and lower hydraulic motors perform actions to test the car springs. The second two-position two-way solenoid valve 502 controls the opening and closing of the oil circuit of the upper motor 501 according to the test requirements. In the lower hydraulic motor control circuit 6, the second proportional directional valve 604 controls the flow direction and flow rate of the hydraulic oil, driving the lower motor 601 to operate. The third two-position two-way solenoid valve 602 and the fourth two-position two-way solenoid valve 603 control the opening and closing of the return oil circuit and the inlet oil circuit of the lower motor 601, respectively, to achieve precise control of the action of the lower motor 601. Thus, the upper and lower hydraulic motors can work together or independently to complete the compression, fatigue and other tests of the same car spring.

[0041] During the test, the leaking oil generated by the upper motor 501 and the lower motor 601 is discharged back to the oil tank 1 through the drain circuit 8; at the same time, the cooling circuit 9 continues to work, the vane pump 901 draws hydraulic oil from the oil tank 1 and delivers it to the air cooler 902 for cooling. After cooling, the hydraulic oil is filtered for impurities by the return oil filter 903 and then flows back to the oil tank 1, ensuring that the temperature of the hydraulic oil in the oil tank 1 is always within the appropriate working range.

[0042] All components mentioned in this article are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods, so they will not be described in detail here.

[0043] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A hydraulic station for testing the durability of automotive springs, characterized in that, include: The oil tank stores oil and is equipped with a main return oil passage and a main outlet oil passage. An axial piston pump with its inlet end connected to an oil tank to provide power; The control valve block controls the oil pressure, and its inlet end is connected to the outlet end of the axial piston pump. The upper hydraulic motor control circuit and the lower hydraulic motor control circuit are connected in parallel between the main return oil circuit and the main output oil circuit, and are used to control the hydraulic motor to test the car spring. The cooling circuit, installed on the oil tank, is used to cool the hydraulic oil inside the tank.

2. The hydraulic station for spring endurance test of an automobile according to claim 1, characterized in that: A first pressure filter is connected to the main oil outlet line between the axial piston pump and the control valve block; a second pressure filter is installed on the oil inlet line of the upper hydraulic motor control circuit.

3. The hydraulic station for spring endurance test of an automobile as claimed in claim 1, wherein: The control valve block includes a first relief valve and an LS feedback loop connected to the axial piston pump. The inlet of the first relief valve is connected to the main oil outlet circuit, and the outlet is connected to the main oil return circuit. A first two-position two-way solenoid valve and a two-position four-way solenoid directional valve are inserted into the control valve block. The first two-position two-way solenoid valve is connected between the main oil return circuit and the main oil outlet circuit. The two-position four-way solenoid directional valve is connected between the LS feedback loop and the main oil return circuit. A second relief valve is also connected between the LS feedback loop and the oil tank.

4. The hydraulic station for spring endurance test of an automobile as claimed in claim 3, wherein: The control valve block is also connected to a pressure sensor, an accumulator, and a pressure gauge.

5. The hydraulic station for durability test of automobile spring of claim 1, wherein: The upper hydraulic motor control circuit includes an upper motor, a first proportional directional valve connected in series with the upper motor, and a second two-position two-way solenoid valve connected in parallel with the upper motor; an oil drain circuit is also connected between the upper motor and the oil tank.

6. The hydraulic station for testing the durability of automotive springs according to claim 1, characterized in that: The lower hydraulic motor control circuit includes a lower motor and a second proportional directional valve connected in series with the lower motor; a third two-position two-way solenoid valve is connected in series on the return oil line of the lower motor, and a fourth two-position two-way solenoid valve is connected in series on the inlet oil line of the lower motor; an oil drain circuit is also connected between the lower motor and the oil tank.

7. The hydraulic station for durability test of automobile spring of claim 1, wherein: The cooling circuit includes a vane pump, with the inlet end of the vane pump connected to an oil tank and the outlet end connected to an air cooler. The outlet end of the air cooler is connected to a return oil filter, and the outlet end of the return oil filter is connected to the oil tank.

8. The hydraulic station for durability test of automobile spring of claim 1, wherein: The oil tank is also equipped with a level gauge, a level switch, a temperature sensor, and an air filter.

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