Anti-impact servo protection device with high-pressure gas as power for material testing machine

Abstract

The utility model provides an anti-impact servo protection device of a material testing machine, which is powered by high-pressure gas and comprises a three-way valve with three flow channel ports, and the included angle of the three flow channel ports is 120 degrees. The three flow channel openings are connected with an oil inlet pipe, an oil return pipe and a main oil pipe respectively. The other end of the oil inlet pipe is communicated with the supercharger, the other end of the oil return pipe is communicated with the oil tank, and the other end of the main oil pipe is communicated with a main engine oil cylinder of the material testing machine. And a micro flow meter is arranged on a pipeline of the main oil pipe. The material testing machine anti-impact servo protection device with the high-pressure gas as power further comprises a controller in signal connection with the micro flow meter and the three-way valve, and the controller is used for controlling the communication state of the three flow channel openings. The anti-impact servo protection device for the material testing machine with the high-pressure gas as the power is simple and convenient in structure installation and high in reliability, does not need to modify a host frame of the existing equipment during use, and can adjust the threshold value of the micro flow meter according to test requirements to meet different use environments.

Description

Technical Field

[0001] The utility model relates to the technical field of air pressure servo power control, in particular to an anti-impact servo protection device for a material testing machine using high-pressure gas as power. Background Art

[0002] Material testing machines are tools designed to obtain material strength parameters. Currently, material testing machines on the market are mainly powered by hydraulic servo systems. Although hydraulic servo power systems have high loading accuracy and stable output, they have high energy consumption and high purchase and maintenance costs, which restricts the promotion and application of high-end hydraulic servo testing machines.

[0003] The patent (application number 202311042587.8) discloses a static ultra-high hydraulic loading system using high-pressure gas as a power source. High-pressure gas replaces the hydraulic pump to provide power for the material testing machine, which can achieve the purpose of reducing energy consumption and reducing costs, while also achieving accuracy and stability comparable to that of a hydraulic servo power system. Although the superior pressure-maintaining performance of high-pressure gas helps to reduce the power consumption of the material testing machine, it is not conducive to the protection of the cylinder piston in the later stage of material damage; that is, when the material being tested yields, since the compression energy contained in the high-pressure gas is basically not dissipated, the high-pressure gas will continue to drive the hydraulic oil to apply a load to the piston in the cylinder, causing the cylinder to be subjected to the dynamic impact of the piston rod.

[0004] In order to prevent the impact of the pneumatic servo power system on the cylinder of the material testing machine, the patent (application number 201811015269.1) provides a technical solution for modifying the loading head of the testing machine. Although this technology can protect the cylinder of the material testing machine, the manufacturing process is too complicated, which will significantly increase the manufacturing cost of the main frame, and is not conducive to the market launch of high-pressure gas-powered testing machine products. In addition, there are no corresponding protection devices in the cylinders of the material testing machines currently in use on the market. When modifying the power system of such old testing machines, it is difficult for the pneumatic servo power system to directly replace the hydraulic servo power system.

[0005] Therefore, there is an urgent need to design an anti-impact servo protection device that is easy to install, easy to use, and has reliable performance, and can be easily installed on an existing testing machine so as to facilitate direct modification of the pneumatic servo power system on the existing material testing machine. Utility Model Content

[0006] The utility model aims to provide an anti-impact servo protection device for a material testing machine using high-pressure gas as a power source, so as to solve the problem that after the tested sample is damaged, the pressure in the oil cylinder of the material testing machine is difficult to be instantly released, and the high-pressure gas continues to drive the hydraulic oil to supply oil to the main engine oil cylinder for loading.

[0007] To achieve the above-mentioned purpose of the utility model, the utility model provides an anti-shock servo protection device for a material testing machine powered by high-pressure gas, comprising a three-way valve with three flow channel openings, the included angle of the three flow channel openings being 120°, and the three flow channel openings being respectively connected to an oil inlet pipe, an oil return pipe, and a main oil pipe; the other end of the oil inlet pipe is connected to a supercharger, the other end of the oil return pipe is connected to a fuel tank, and the other end of the main oil pipe is connected to a main engine cylinder of the material testing machine; a micro-flow meter is arranged on the main oil pipe; the anti-shock servo protection device for a material testing machine powered by high-pressure gas also comprises a controller connected to the micro-flow meter and the three-way valve signal, and the controller is used to control the connectivity status of the three flow channel openings.

[0008] As a further improvement of the utility model, a variable cross-section mechanical damper is arranged on the oil return pipe.

[0009] As a further improvement of the utility model, an oil drain pipeline is provided between the main engine oil cylinder and the oil tank.

[0010] As a further improvement of the present invention, a first oil filling pump is arranged between the oil tank and the supercharger, and a second oil filling pump is arranged between the oil tank and the main engine oil cylinder.

[0011] As a further improvement of the utility model, a piston is arranged in the main engine oil cylinder, and the piston separates the main engine oil cylinder into an upper first oil pressure chamber and a lower second oil pressure chamber which are independent of each other, and the second oil injection pump is connected to the second oil pressure chamber.

[0012] As a further improvement of the present invention, the micro flow meter and the three-way valve are connected to the controller signal through a signal line.

[0013] The beneficial effects of the utility model are:

[0014] The utility model provides an anti-shock servo protection device for a material testing machine powered by high-pressure gas. The device connects the three flow passages of a three-way valve to an oil inlet pipe, an oil return pipe, and a main oil pipe respectively; and the angle between the three flow passages is 120°, the other end of the oil inlet pipe is connected to a supercharger, the other end of the oil return pipe is connected to a fuel tank, and the other end of the main oil pipe is connected to a main oil cylinder of the material testing machine; and a micro-flow meter is arranged on the main oil pipe; the micro-flow meter, the three-way valve and the controller are connected by signal, and the connection state of the three flow passages is controlled by the controller. The anti-shock servo protection device for a material testing machine powered by high-pressure gas has an easy-to-install structure and high reliability. It does not require modification of the main frame of the existing equipment when in use, and can adjust the threshold of the micro-flow meter according to the test needs to meet different use environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the composition of a material testing machine using high pressure gas as a power source in an embodiment of the utility model;

[0016] Figure 2 This is a diagram showing the connection state between the oil inlet pipe and the main oil pipe in the embodiment of the utility model;

[0017] Figure 3 This is a diagram showing the connection state of the oil inlet pipe and the oil return pipe in the embodiment of the utility model;

[0018] Figure 4 This is a diagram showing the connection status of the main oil pipe and the oil return pipe in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0021] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0022] See also Figure 1 As shown, the utility model provides an anti-shock servo protection device 10 for a material testing machine powered by high-pressure gas. The protection device is arranged between the main oil cylinder 1 of the material testing machine and the pneumatic servo power system 2, and is connected to the main oil cylinder 1 through the main oil pipe 3. The pneumatic servo power system 2 provides high-pressure power to the supercharger 21, and the supercharger 21 is connected to the oil inlet pipe 4. A first oil injection pump 31 is arranged between the oil tank 22 and the supercharger 21, and a second oil injection pump 32 is arranged between the oil tank 22 and the main oil cylinder 1. A piston is arranged in the main oil cylinder 1, and the piston separates the main oil cylinder 1 into an upper first oil pressure chamber and a lower second oil pressure chamber that are independent of each other. The second oil injection pump 32 is connected to the second oil pressure chamber. An oil drain pipe 23 is arranged between the main oil cylinder 1 and the oil tank 22.

[0023] See also Figures 1 to 4As shown, the anti-shock servo protection device for a material testing machine powered by high-pressure gas includes a three-way valve 40 with three flow passages, the angle of the three flow passages is 120°, and the three flow passages are respectively connected to the oil inlet pipe 4, the oil return pipe 5, and the main oil pipe 3. The other end of the oil inlet pipe 4 is connected to the supercharger 21, the other end of the oil return pipe 5 is connected to the oil tank 22, and the other end of the main oil pipe 3 is connected to the main engine cylinder 1 of the material testing machine. A micro flow meter 8 is arranged on the main oil pipe 3. The anti-shock servo protection device 10 for a material testing machine powered by high-pressure gas also includes a controller 9 connected to the micro flow meter 8 and the three-way valve 40 signals, so as to realize the control of the connection state of the three flow passages by the controller 9.

[0024] In this embodiment, the micro flow meter 8, the three-way valve 40 and the controller 9 are connected via a signal line. A variable cross-section mechanical damper is provided on the oil return pipe 5 to effectively prevent the hydraulic oil from being sprayed at high pressure.

[0025] The working principle of the anti-shock servo protection device 10 for a material testing machine powered by high-pressure gas is described below:

[0026] 1) Preloading process: Before loading begins, the three-way valve 40 is in Figure 2 In the state shown, the oil inlet pipe 4 is connected to the main oil pipe 3, and the first oil injection pump 31 is started to pump hydraulic oil into the booster 21. Then, the hydraulic oil enters the main engine cylinder 1 through the oil inlet pipe 4, the three-way valve 40, and the main oil pipe 3, and pushes the piston rod 11 in the main engine cylinder 1 to contact the upper surface of the test piece. At this time, the micro flow meter 8 collects the flow data of the main oil pipe 3.

[0027] 2) Loading process: Start the pneumatic servo power system 30 to gradually increase the pressure in the supercharger 21 , and then apply hydraulic pressure to the main engine cylinder 1 through the three-way valve 40 .

[0028] 3) Destruction stage of the test piece: After the test piece yields and loses its bearing capacity, the piston rod 11 in the main engine cylinder 1 continues to move downward due to the loss of resistance, resulting in an increase in the upper space of the main engine cylinder 1. The hydraulic oil flows from the booster 21 into the main engine cylinder 1 through the three-way valve 40. At this time, the micro-flow meter 8 detects the change in the flow rate of the hydraulic oil in the main oil pipe 3 and transmits the signal to the controller 9. After receiving the signal from the micro-flow meter 8, the controller 9 controls the valve core of the three-way valve 40 to rotate 120° clockwise, that is, adjust to Figure 3 In the state shown, the hydraulic oil in the booster 21 enters the oil tank 22 through the oil inlet pipe 4, the three-way valve 40, and the oil return pipe 5. The mechanical damper arranged on the oil return pipe 5 can effectively prevent the hydraulic oil from being sprayed at high pressure.

[0029] 4) Oil cylinder piston return process: The controller 9 drives the valve core of the three-way valve 40 to rotate 120° clockwise to Figure 4In the state shown, the main oil pipe 3 is connected to the oil return pipe 5. The second oil injection pump 32 between the oil tank 22 and the main engine oil cylinder 1 is started to supply oil to the lower part of the main engine oil cylinder 1, pushing the piston rod 11 in the main engine oil cylinder 1 to move upward, and the hydraulic oil in the upper space of the main engine oil cylinder 1 flows into the oil tank 22 through the main oil pipe 3, the three-way valve 40, and the oil return pipe 5. After the piston rod 11 in the main engine oil cylinder 1 returns to its original position, the controller 9 drives the valve core of the three-way valve to rotate 120° clockwise to Figure 2 The test is finished.

[0030] In summary, the utility model proposes an anti-shock servo protection device for a material testing machine powered by high-pressure gas, by connecting the three flow passages of the three-way valve to the oil inlet pipe, the oil return pipe, and the main oil pipe respectively; and the angle between the three flow passages is 120°, the other end of the oil inlet pipe is connected to the supercharger, the other end of the oil return pipe is connected to the oil tank, and the other end of the main oil pipe is connected to the main oil cylinder of the material testing machine; and a micro-flow meter is arranged on the main oil pipe; the micro-flow meter, the three-way valve and the controller signal are connected, and the connection state of the three flow passages is controlled by the controller. The anti-shock servo protection device for a material testing machine powered by high-pressure gas has an easy-to-install structure and high reliability. It does not require the modification of the existing equipment main frame when in use, and can adjust the threshold of the micro-flow meter according to the test needs to meet different use environments.

[0031] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. An anti-shock servo protection device for a material testing machine powered by high-pressure gas, characterized in that: It comprises a three-way valve with three flow channel openings, the included angle of the three flow channel openings is 120°, the three flow channel openings are respectively connected to an oil inlet pipe, an oil return pipe and a main oil pipe; the other end of the oil inlet pipe is connected to a supercharger, the other end of the oil return pipe is connected to a fuel tank, and the other end of the main oil pipe is connected to a main engine oil cylinder of a material testing machine; a micro flow meter is arranged on the main oil pipe; the anti-shock servo protection device for a material testing machine powered by high-pressure gas also comprises a controller connected to the micro flow meter and the three-way valve signal, and the controller is used to control the connectivity status of the three flow channel openings.

2. The anti-shock servo protection device for a material testing machine powered by high-pressure gas according to claim 1, characterized in that: A variable-section mechanical damper is arranged on the oil return pipe.

3. The anti-shock servo protection device for a material testing machine powered by high-pressure gas according to claim 1, characterized in that: An oil drain pipeline is arranged between the main engine oil cylinder and the oil tank.

4. The anti-shock servo protection device for a material testing machine powered by high-pressure gas according to claim 1, characterized in that: A first oil injection pump is arranged between the oil tank and the supercharger, and a second oil injection pump is arranged between the oil tank and the main engine oil cylinder.

5. The anti-shock servo protection device for a material testing machine powered by high-pressure gas according to claim 4, characterized in that: A piston is arranged in the main engine oil cylinder, and the piston separates the main engine oil cylinder into an upper first oil pressure chamber and a lower second oil pressure chamber which are independent of each other, and the second oil injection pump is connected to the second oil pressure chamber.

6. The anti-shock servo protection device for a material testing machine powered by high-pressure gas according to claim 1, characterized in that: The micro flow meter and the three-way valve are connected to the controller signal through a signal line.

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