A pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder

Abstract

The present invention relates to a pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder. The test bench includes an electrical control part, a hydraulic drive part, and an execution part. The electrical control part includes a control system and an HMI human-computer interaction, and the control system is connected to the HMI human-computer interaction; the hydraulic drive part includes a main oil tank, a servo valve / a closed pump containing a swing angle position sensor LVDT; the execution part is a pressure generator driven by an asymmetric cylinder, and a position sensor and a pressure sensor are respectively installed on the asymmetric cylinder of the pressure generator; the main oil tank, the servo valve, the closed pump, and the pressure generator are connected by pipelines to form a main oil circuit, and the pressure generator is connected to a workpiece to be tested; the control system is connected to the servo valve, the swing angle position sensor LVDT of the closed pump is connected to the control system, and the position sensor and the pressure sensor are respectively connected to the control system. The two-stage amplification (valve-controlled pump, pump-controlled cylinder) method can significantly reduce the system test bench's requirements for a large flow of the servo valve.

Description

Technical Field

[0001] The invention relates to fatigue testing, in particular to a pump-controlled pressure fatigue pulse testing platform based on an asymmetric cylinder. Background Art

[0002] Conventional controllable waveform hydraulic pulse generators adopt the principle of valve-controlled cylinders, and all use symmetrical cylinders to achieve position control; when used for large-volume waveform-controlled pulse fatigue tests, when the power is above 37KW, the disadvantages of low system efficiency and high heat generation will become very obvious (the theoretical maximum efficiency of the servo system of the valve-controlled cylinder is 38%), and the demand for large-flow servo valves obviously exceeds the conventional specification range of servo valves. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder.

[0004] Technical solution of the present invention:

[0005] A pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder, the test bench comprising an electrical control part, a hydraulic drive part, and an execution part, the electrical control part comprising a control system and an HMI human-computer interaction, the control system being connected to the HMI human-computer interaction; the hydraulic drive part comprising a main oil tank and a servo valve; the execution part being a pressure generator (booster); the hydraulic drive part also comprising a closed pump containing a swing angle position sensor LVDT, the pressure generator being a pressure generator driven by an asymmetric cylinder, a position sensor and a pressure sensor being respectively installed on the asymmetric cylinder of the pressure generator; the main oil tank, the servo valve, the closed pump, and the pressure generator being connected by pipelines to form a main oil circuit, the pressure generator being connected to a workpiece to be tested.

[0006] The control system is connected to the servo valve, the swing angle position sensor LVDT of the closed pump is connected to the control system, and the position sensor and the pressure sensor are respectively connected to the control system.

[0007] The test bench has two modes, one is a position control mode and the other is a pressure control mode. The position control mode is that the control system collects the position information of the position sensor, and uses it to control the asymmetric cylinder movement of the closed pump-driven pressure generator to exhaust or replenish oil. The pressure control mode is that the control system collects the pressure information of the pressure sensor, and uses it to control the asymmetric cylinder movement of the closed pump-driven pressure generator to achieve pressure control and apply specific pressure and periodic pulses to the workpiece to be tested.

[0008] The workpiece to be tested is a gas cylinder or others.

[0009] The test bench also includes a double pump, one of which is a pilot pump and the other is an oil replenishment pump; the main oil tank, the pilot pump, and the servo valve are connected by pipelines to form a pilot oil circuit, and the main oil tank, the oil replenishment pump, and the oil inlet pipeline of the main oil circuit are connected by pipelines to form an oil replenishment circuit.

[0010] In the pilot oil circuit, a one-way valve, a pilot filter, an accumulator, a pilot relief valve, and a pilot oil circuit pressure sensor are sequentially installed on the pipeline connecting the pilot pump and the servo valve, and the pilot relief valve is connected to the main oil tank through a pipeline.

[0011] In the oil replenishment circuit, a one-way valve, an oil replenishment filter, an oil replenishment overflow valve, a one-way valve, an accumulator, and an oil replenishment overflow valve are installed in sequence on the pipeline connecting the oil replenishment pump and the oil inlet pipeline of the main oil circuit. Both oil replenishment overflow valves are connected to the main oil tank through pipelines, and a return oil filter is installed on the pipeline connecting the oil replenishment overflow valve and the main oil tank.

[0012] A return oil filter is installed on the pipe connecting the duplex pump and the main oil tank.

[0013] The test bench also includes a pre-fill oil replenishment assembly:

[0014] The pre-filling oil replenishing component, the pressure generator, and the workpiece to be tested are connected through pipelines to form a pre-filling oil replenishing circuit.

[0015] In the pre-filling and oil replenishing circuit, an air-controlled stop valve and a one-way valve are installed in sequence on the oil inlet pipeline connecting the pre-filling and oil replenishing component and the pressure generator, and an air-controlled stop valve is installed on the oil return pipeline connecting the pre-filling and oil replenishing component and the pressure generator; the pre-filling and oil replenishing component is composed of an oil tank, an oil pump, a stop valve, a filter, etc. connected by pipelines.

[0016] The test bench also includes a gas control pipeline.

[0017] The air control pipeline is composed of a main pipeline connected to two branch pipelines, wherein the main pipeline is connected to the air source, and the two branch pipelines are respectively connected to two air control stop valves, and a manual stop valve, an air filter, and a pressure reducing valve are installed on the main pipeline in sequence.

[0018] The test bench also includes a cooling circuit assembly:

[0019] The main oil tank, cooling circulation assembly, and pressure generator (supercharger) are connected by pipelines to form a cooling circulation oil circuit; the cooling circulation assembly is composed of an oil pump, a cooler, and a filter.

[0020] A manual exhaust valve is installed on the workpiece to be tested.

[0021] Two main oil circuit pressure sensors and a safety valve are installed in the main oil circuit.

[0022] The advantages of the present invention are reasonable design and simple structure. The control system realizes the displacement control of the closed pump through the servo valve and LVDT, thereby realizing the inner loop control, and then the pressure closed loop or position closed loop is realized through the pressure sensor and position sensor arranged on the pressure generator of the execution part; the pressure closed loop or position closed loop is the outer loop control, and the pressure closed loop and the position closed loop adopt time-sharing control, and the two are flexibly switched; in this way, the two-stage amplification ( Valve controlled pump, pump controlled cylinder ) can significantly reduce the test bench's requirements for large servo valve flows, reduce power waste on the servo valve, and thus improve system efficiency. A smaller-power servo valve can be used to achieve fatigue pulse testing of a larger workpiece volume, which is suitable for pulse testing of a larger workpiece volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the schematic diagram of a pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder.

[0024] Figure 2 This is a system diagram of a pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder.

[0025] Figure 3 It is the gas control pipeline diagram.

[0026] In the figure, electrical control part 1, control system 1-1, HMI human-computer interaction 1-2, hydraulic drive part 2, main oil tank 2-1, servo valve 2-2, closed pump 2-3, pressure generator 3-1, asymmetric cylinder of pressure generator 3-1-1, position sensor 1-3, pressure sensor 1-4, double pump 2-4, pilot pump 2-4-1, oil replenishment pump 2-4-2, check valve 2-5, pilot filter 2-6, accumulator 2-7, pilot relief valve 2-8, pilot oil circuit pressure sensor 2-9, check valve 2-10, oil replenishment filter 2-11, oil replenishment relief valve 2-12, check valve 2-13, accumulator 2 -14, oil replenishment overflow valve 2-15, return oil filter 2-16, return oil filter 2-17, return oil filter 2-18, main oil circuit pressure sensor 2-19, main oil circuit pressure sensor 2-20, safety valve 2-21, pre-filling oil replenishment component 2-22, pneumatic stop valve 2-23, one-way valve 2-24, pneumatic stop valve 2-25, pneumatic pipeline 2-26, main pipeline 2-26-1, branch pipeline 2-26-2, branch pipeline 2-26-3, manual stop valve 2-26-4, air filter 2-26-5, pressure reducing valve 2-26-6, cooling circulation component 2-27, execution part 3, workpiece to be tested 4. DETAILED DESCRIPTION

[0027] like Figure 1-3As shown, a pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder, the test bench includes an electrical control part 1, a hydraulic drive part 2, and an execution part 3. The electrical control part 1 includes a control system 1-1 and an HMI human-computer interaction 1-2, and the control system 1-1 is connected to the HMI human-computer interaction 1-2; the hydraulic drive part 2 includes a main oil tank 2-1 and a servo valve 2-2; the execution part 3 is a pressure generator 3-1; the hydraulic drive part 2 also includes a closed pump 2-3 including a swing angle position sensor LVDT, the pressure generator 3-1 is a pressure generator driven by an asymmetric cylinder, and the asymmetric cylinder 3-1-1 of the pressure generator is respectively provided with It is equipped with a position sensor 1-3 and a pressure sensor 1-4; the main oil tank 2-1, the servo valve 2-2, the closed pump 2-3, and the pressure generator 3-1 are connected by pipelines to form a main oil circuit, and the pressure generator 3-1 is connected to the workpiece 4 to be tested; the control system 1-1 is connected to the servo valve 2-2, the swing angle position sensor LVDT of the closed pump 2-3 is connected to the control system 1-1, and the position sensor 1-3 and the pressure sensor 1-4 are connected to the control system 1-1 respectively; the workpiece 4 to be tested is a gas cylinder; the test bench also includes a double pump 2-4, the double pump 2-4 is a pilot pump 2-4-1 and a replenishing pump 2-4-2; the main oil tank 2-1, the pilot pump 2-4-1 and the replenishing pump 2-4-2 are connected to the control system 1-1; the control system 1-1 is connected to the servo valve 2-2, the swing angle position sensor LVDT of the closed pump 2-3 is connected to the control system 1-1, and the position sensor 1-3 and the pressure sensor 1-4 are connected to the control system 1-1 respectively; the workpiece 4 to be tested is a gas cylinder; the test bench also includes a double pump 2-4, the double pump 2-4 is a pilot pump 2-4-1 and a replenishing pump 2-4-2; The pilot pump 2-4-1 and the servo valve 2-2 are connected by pipelines to form a pilot oil circuit. The main oil tank 2-1, the replenishing oil pump 2-4-2 and the oil inlet pipeline of the main oil circuit are connected by pipelines to form an replenishing oil circuit. In the pilot oil circuit, a one-way valve 2-5, a pilot filter 2-6, an accumulator 2-7, a pilot relief valve 2-8 and a pilot oil circuit pressure sensor 2-9 are installed in sequence on the pipeline connecting the pilot pump 2-4-1 and the servo valve 2-2. The pilot relief valve 2-9 is connected to the main oil tank 2-1 through a pipeline. In the replenishing oil circuit, a one-way valve 2-10, a replenishing oil filter 2-11 and a replenishing oil relief valve are installed in sequence on the pipeline connecting the replenishing oil pump 2-4-2 and the oil inlet pipeline of the main oil circuit. 2-12, one-way valve 2-13, accumulator 2-14, oil replenishment overflow valve 2-15, the oil replenishment overflow valve 2-12 and the oil replenishment overflow valve 2-15 are connected to the main oil tank 2-1 through pipelines, a return oil filter 2-16 is installed on the pipeline connecting the oil replenishment overflow valve 2-12 and the main oil tank 2-1, and a return oil filter 2-17 is installed on the pipeline connecting the oil replenishment overflow valve 2-15 and the main oil tank 2-1; a return oil filter 2-18 is installed on the pipeline connecting the duplex pump 2-4 and the main oil tank 2-1; a manual exhaust valve 4-1 is installed on the workpiece 4 to be tested; a main oil circuit pressure sensor 2-19, a main oil circuit pressure sensor 2-20, and a safety valve 2-21 are installed in the main oil circuit.

[0028] The test bench also includes a pre-filling oil replenishing component 2-22; the pre-filling oil replenishing component 2-22, the pressure generator 3-1, and the workpiece 4 to be tested are connected by pipelines to form a pre-filling oil replenishing circuit; in the pre-filling oil replenishing circuit, an air-controlled stop valve 2-23 and a one-way valve 2-24 are installed in sequence on the oil inlet pipeline connecting the pre-filling oil replenishing component 2-22 and the pressure generator 3-1, and an air-controlled stop valve 2-25 is installed on the oil return pipeline connecting the pre-filling oil replenishing component 2-22 and the pressure generator 3-1; the test bench It also includes an air-controlled pipeline 2-26; the air-controlled pipeline 2-26 is composed of a main pipeline 2-26-1 connected to a branch pipeline 2-26-2 and a branch pipeline 2-26-3, wherein the main pipeline 2-26-1 is connected to the air source, the branch pipeline 2-26-2 is connected to the air-controlled stop valve 2-23, and the branch pipeline 2-26-3 is connected to the air-controlled stop valve 2-23, and a manual stop valve 2-26-4, an air filter 2-26-5, and a pressure reducing valve 2-26-6 are installed in sequence on the main pipeline 2-26-1.

[0029] The test bench also includes a cooling circulation component 2-27; the main oil tank 2-1, the cooling circulation component 2-27, and the pressure generator 3-1 are connected by pipelines to form a cooling circulation oil circuit.

[0030] The test bench has two modes, one is a position control mode and the other is a pressure control mode. The position control mode is that the control system 1-1 collects the position information of the position sensor 1-3, and controls the closed pump 2-3 to drive the asymmetric cylinder 3-1-1 of the pressure generator to operate, exhaust or replenish oil. The pressure control mode is that the control system 1-1 collects the pressure information of the pressure sensor 1-4, and controls the closed pump 2-3 to drive the asymmetric cylinder 3-1-1 of the pressure generator to operate, realize pressure control, and apply specific pressure and periodic pulses to the test workpiece 4.

[0031] The working steps of the above test bench are:

[0032] 1) Pre-fill the gas cylinder and the asymmetric cylinder 3-1-1 of the pressure generator with the test medium through the pre-filling oil replenishing assembly 2-22.

[0033] 2) Restart the closed pump 2-3 and the oil replenishment and pilot double pump 2-4, and control the swing angle of the closed pump 2-3 by controlling the servo valve 2-2, thereby realizing the position control mode of the asymmetric cylinder 3-1-1 of the pressure generator for exhaust.

[0034] 3) Switch the control mode and control the servo valve 2-2 to realize the swing angle control of the closed pump 2-3, thereby realizing the pressure control of the asymmetric cylinder 3-1-1 of the pressure generator, and realizing the pulse fatigue test of the specific pressure and period of the gas cylinder. The typical test waveforms include sine, trapezoidal, triangle and square waves.

[0035] 4) During the test, the test bench will slowly leak internally, and it is necessary to switch the pressure control mode to the position mode to replenish oil again, so as to continue the test until the set number of tests is completed.

[0036] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder, the test bench comprises an electrical control part, a hydraulic drive part, and an execution part, the electrical control part comprises a control system and an HMI human-computer interaction, the control system is connected to the HMI human-computer interaction; the hydraulic drive part comprises a main oil tank and a servo valve; the execution part is a pressure generator; it is characterized in that, The hydraulic drive part also includes a closed pump including a swing angle position sensor LVDT, the pressure generator is a pressure generator driven by an asymmetric cylinder, and a position sensor and a pressure sensor are respectively installed on the asymmetric cylinder of the pressure generator; the main oil tank, the servo valve, the closed pump, and the pressure generator are connected by pipelines to form a main oil circuit, and the pressure generator is connected to the workpiece to be tested; The control system is connected to the servo valve, the LVDT swing angle position sensor of the closed pump is connected to the control system, and the position sensor and the pressure sensor are respectively connected to the control system; The workpiece to be tested is a gas cylinder or others; The test bench also includes a double pump, one of which is a pilot pump and the other is an oil replenishment pump; the main oil tank, the pilot pump, and the servo valve are connected by pipelines to form a pilot oil circuit, and the main oil tank, the oil replenishment pump, and the oil inlet pipeline of the main oil circuit are connected by pipelines to form an oil replenishment circuit; The test bench has two modes, one is a position control mode and the other is a pressure control mode. The position control mode is that the control system collects the position information of the position sensor, and uses it to control the asymmetric cylinder movement of the closed pump-driven pressure generator to exhaust or replenish oil. The pressure control mode is that the control system collects the pressure information of the pressure sensor, and uses it to control the asymmetric cylinder movement of the closed pump-driven pressure generator to achieve pressure control and apply specific pressure and periodic pulses to the workpiece to be tested.

2. A pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder according to claim 1, characterized in that: In the pilot oil circuit, a one-way valve, a pilot filter, an accumulator, a pilot relief valve, and a pilot oil circuit pressure sensor are sequentially installed on the pipeline connecting the pilot pump and the servo valve, and the pilot relief valve is connected to the main oil tank through a pipeline; In the oil replenishment circuit, a one-way valve, an oil replenishment filter, an oil replenishment overflow valve, a one-way valve, an accumulator, and an oil replenishment overflow valve are sequentially installed on the pipeline connecting the oil replenishment pump and the oil inlet pipeline of the main oil circuit. Both oil replenishment overflow valves are connected to the main oil tank through pipelines, and a return oil filter is installed on the pipeline connecting the oil replenishment overflow valve and the main oil tank. A return oil filter is installed on the pipe connecting the duplex pump and the main oil tank.

3. The pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder according to claim 1 is characterized in that: The test bench also includes a pre-fill oil replenishment component; The pre-filling and oil replenishing assembly, the pressure generator, and the workpiece to be tested are connected by pipelines to form a pre-filling and oil replenishing circuit; In the pre-filling oil replenishment circuit, an air-controlled stop valve and a one-way valve are installed in sequence on the oil inlet pipeline connecting the pre-filling oil replenishment component and the pressure generator, and an air-controlled stop valve is installed on the oil return pipeline connecting the pre-filling oil replenishment component and the pressure generator.

4. The pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder according to claim 3 is characterized in that: The test bench also includes a gas control pipeline; The air control pipeline is composed of a main pipeline connected to two branch pipelines, wherein the main pipeline is connected to the air source, and the two branch pipelines are respectively connected to two air control stop valves, and a manual stop valve, an air filter, and a pressure reducing valve are installed on the main pipeline in sequence.

5. The pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder according to claim 1 is characterized in that: The test bench also includes a cooling cycle assembly; The main oil tank, the cooling circulation component and the pressure generator are connected through pipelines to form a cooling circulation oil circuit.

6. The pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder according to claim 1 is characterized in that: A manual exhaust valve is installed on the workpiece to be tested.

7. The pump-controlled pressure fatigue pulse test bench based on an asymmetric cylinder according to claim 1 is characterized in that: Two main oil circuit pressure sensors and a safety valve are installed in the main oil circuit.

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