Mechanical property testing method, mechanical property testing environment box and testing system

Abstract

The invention discloses a mechanical property testing method, a mechanical property testing environment box and a testing system, the mechanical property testing environment box is used for testing the mechanical property of a material in a gaseous hydrogen pressure environment, and the mechanical property testing environment box comprises a box body cover, a box body, a stretching mechanism and a control mechanism; the box body cover and the box body are detachably and hermetically connected; the stretching mechanism comprises an upper clamp, a lower clamp, a hydraulic transmission module and a hydraulic driving module, the upper clamp, the lower clamp and the hydraulic transmission module are arranged in a box body, the hydraulic driving module is arranged outside the box body, and the hydraulic transmission module comprises a hydraulic rod, a hydraulic cylinder and a hydraulic piston; an upper clamp for fixing the upper end of the sample is fixedly connected with the box body cover; a lower clamp for fixing the lower end of the sample is fixedly connected with the upper end of the hydraulic rod; the control mechanism is arranged outside the box body; the hydraulic driving module is in circuit connection with the control mechanism; according to the invention, the problem of gas leakage in the environment box caused by dynamic sealing failure of the environment box with a dynamic sealing structure is effectively avoided, and a stable and reliable hydrogen pressure environment is provided for material mechanical property test and evaluation.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical property testing, and in particular to a mechanical property testing method, a mechanical property testing environment box and a testing system. Background Art

[0002] As a renewable secondary energy source, hydrogen has the advantages of wide sources, clean and efficient, and rich application scenarios. The role of hydrogen in the world's energy transformation is becoming increasingly prominent. Currently, hydrogen storage and transportation mainly rely on storage and transportation methods under high-pressure gas. Researching the mechanical properties of materials under hydrogen pressure environment and clarifying the compatibility of materials with hydrogen are crucial to ensuring the long-term safe and stable operation of hydrogen storage and transportation facilities.

[0003] Due to its small mass, easy leakage and diffusion, low ignition energy, and wide explosion range, hydrogen is crucial to ensure the long-term safe and stable operation of hydrogen storage and transportation facilities. Currently, hydrogen storage and transportation are mainly stored or transported in a high-pressure gas state. It is also particularly important to study the mechanical properties of materials under hydrogen pressure and clarify the compatibility of materials with hydrogen.

[0004] Currently, most tests on the mechanical properties of materials are carried out in environmental chambers to simulate high-pressure hydrogen environments. This mechanical properties testing method has strict requirements on the sealing, safety and reliability of the environmental chamber, and has extremely high requirements for the safety risk control of the laboratory during the test, especially when the test device contains moving parts, the sealing of the moving parts is particularly critical.

[0005] The inventors have found through research that the mechanical properties testing device in the prior art still has at least the following defects:

[0006] In a high pressure environment such as a gaseous hydrogen pressure environment, a test device with a dynamic seal structure is prone to hydrogen leakage.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] The object of the present invention is to provide a mechanical property testing method, a mechanical property testing environment box and a testing system capable of preventing hydrogen leakage.

[0009] The present invention provides a mechanical property test environment box, which is used for testing the mechanical properties of materials in a gaseous hydrogen pressure environment, and comprises a box cover, a box body, a stretching mechanism and a control mechanism;

[0010] The box cover and the box body are detachably and tightly connected;

[0011] The stretching mechanism includes an upper clamp, a lower clamp, a hydraulic transmission module arranged in the box body, and a hydraulic drive module arranged outside the box body, wherein:

[0012] The hydraulic transmission module includes a hydraulic rod, a hydraulic cylinder and a hydraulic piston; the upper clamp used to fix the upper end of the sample is fixedly connected to the box cover; the lower clamp used to fix the lower end of the sample is fixedly connected to the upper end of the hydraulic rod;

[0013] The control mechanism is arranged outside the box; the hydraulic drive module is connected to the control mechanism circuit.

[0014] Preferably, in an embodiment of the present invention, the connection mechanism between the box cover and the box body comprises:

[0015] A fastening bolt used for sealingly connecting the box cover and the box body, and a sealing ring arranged in a groove on the top wall of the box cover.

[0016] Preferably, in an embodiment of the present invention, the hydraulic transmission module comprises:

[0017] The hydraulic rod and the hydraulic cylinder are connected in a sliding seal.

[0018] Preferably, in an embodiment of the present invention, the hydraulic transmission component, the upper clamp, the lower clamp and the box are all on the same vertical axis.

[0019] Preferably, in the embodiment of the present invention, it also includes a pressure sensing module and a mechanical performance testing module disposed in the box:

[0020] The pressure sensing module and the mechanical property testing module are both connected to the control mechanism circuit.

[0021] Preferably, in an embodiment of the present invention, the box body is provided with lead holes for connecting the pressure sensing module and the mechanical property testing module.

[0022] Preferably, in the embodiment of the present invention, it also includes:

[0023] A connection mechanism used for fixed connection with a test bench.

[0024] In another aspect of the present invention, a mechanical property testing method is also provided, which is applicable to the above-mentioned mechanical property testing environment box, comprising the steps of:

[0025] S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box, gas concentration parameter values ​​of the preset gas, and moisture parameter values;

[0026] S12, calculating the pressure value in the hydraulic cylinder according to the pulling force value required by the experiment;

[0027] S13, controlling the gas concentration of the environmental box to reach the gas concentration parameter value through a control mechanism; and at the same time, the moisture content reaches the moisture parameter value;

[0028] S14. When the ambient pressure in the environmental box reaches the pressure parameter value, the pressure value in the hydraulic cylinder is controlled by the control mechanism to adjust the downward pulling force of the hydraulic rod to the pulling force value required for the experiment.

[0029] Preferably, in the embodiment of the present invention, it also includes:

[0030] S15. According to the actual tensile force value of the sample and the tensile displacement of the sample, the mechanical property parameter value of the material of the sample in the gaseous environment is obtained.

[0031] Preferably, in an embodiment of the present invention, when the ambient pressure in the environmental box reaches the pressure parameter value, the method further comprises:

[0032] Stabilize the environmental chamber.

[0033] In another aspect of the present invention, a mechanical property testing system is provided, comprising an air supply mechanism, an environmental chamber, a detection module and a post-processing mechanism, all of which are arranged in a closed cavity; wherein the environmental chamber comprises the above-mentioned mechanical property testing environmental chamber,

[0034] The gas supply mechanism comprises a gas supply unit for delivering a preset gas, and a booster pump for pressurizing the preset gas;

[0035] The post-processing mechanism includes a waste gas recovery tank for recovering the environmental box, and a burner for treating hydrogen discharged from the environmental box;

[0036] The detection module includes an oxygen concentration detector, a hydrogen concentration detector, a moisture detector and a pressure gauge; the detection module is used to detect the moisture content, gas concentration and pressure value of the environmental box;

[0037] The air supply unit is connected to the booster pump and the environmental box through pipelines respectively; the environmental box is connected to the burner and the exhaust gas recovery tank through pipelines respectively; a detection module is provided above the environmental box.

[0038] Preferably, in an embodiment of the present invention, the enclosed cavity comprises an explosion-proof cabinet;

[0039] A hydrogen detector and a flame detector are respectively provided at the corners of the inner top wall cabinet of the explosion-proof cabinet;

[0040] The outer top wall of the explosion-proof cabinet is provided with an alarm and an exhaust system.

[0041] Preferably, in an embodiment of the present invention, the burner is arranged above the outer top wall of the explosion-proof cabinet.

[0042] Preferably, in the embodiment of the present invention, the gas supply mechanism, the detection module, the hydrogen detector, and the flame detector are all connected to the control mechanism.

[0043] Preferably, in an embodiment of the present invention, the gas supply unit includes a hydrogen cylinder and / or a nitrogen cylinder.

[0044] Preferably, in an embodiment of the present invention, a valve is included, and the valve is arranged at:

[0045] The branch pipelines of the air supply unit, the inlet of the booster pump, the outlet of the booster pump, the pipeline connecting the environmental box with the air supply unit, and the pipeline connecting the environmental box with the post-processing mechanism.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The invention provides a mechanical property test environment box, which is used for testing the mechanical property of materials under a gaseous hydrogen pressure environment, and comprises a box cover, a box body, a stretching mechanism and a control mechanism; the box cover and the box body are detachably and hermetically connected; the stretching mechanism comprises an upper clamp, a lower clamp, a hydraulic transmission module and a hydraulic drive module, wherein: the upper clamp used for fixing the upper end of a sample is fixedly connected to the box cover; the lower clamp used for fixing the lower end of the sample is fixedly connected to a hydraulic rod head of the hydraulic transmission module; the hydraulic drive module and the control mechanism are both arranged outside the box; the hydraulic transmission module is connected to the hydraulic drive module through a pipeline; the hydraulic drive module is connected to the control mechanism circuit; all components involving hydrogen are arranged in a closed cavity, hydraulic oil is transported to the hydraulic transmission module through the hydraulic drive module, the hydraulic piston moves downward, and the lower clamp is driven to stretch downward while the hydraulic rod head moves downward, thereby achieving the stretching of the sample.

[0048] The working principle of the mechanical property testing environment box of the present invention is that the hydraulic oil is transported to the hydraulic cylinder through the hydraulic drive module to generate pressure in the hydraulic cylinder, which will cause the hydraulic piston to move downward, and the lower clamp is driven to generate a downward pulling force while the hydraulic rod head moves downward; by adjusting the work done by the hydraulic drive component, the pressure value in the hydraulic cylinder can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp, thereby realizing the control of the tensile force of the sample.

[0049] Since it is no longer necessary to provide a dynamic sealing structure on the sealed box to transmit force to the sample in the embodiment of the present invention, the problem of gas leakage in the environmental box due to dynamic seal failure in the environmental box with a dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation, further reducing the risk of the test.

[0050] The present invention provides effective safeguard measures for the safety of mechanical property testing by arranging all components involving hydrogen in a closed cavity and arranging a control mechanism outside the closed cavity, thereby completely isolating a test area from an operating area.

[0051] In addition, the environmental box in the embodiment of the present invention has a simple structure and is easy and quick to assemble, making the test operation convenient, thereby providing an effective way and means for evaluating the mechanical properties of materials in a high-pressure gaseous hydrogen environment.

[0052] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 It is a structural schematic diagram of the mechanical properties test environment box in the present invention;

[0055] Figure 2 It is a step diagram of the mechanical property testing method of the present invention;

[0056] Figure 3 It is a structural schematic diagram of the mechanical properties testing system of the present invention; DETAILED DESCRIPTION

[0057] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0058] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0059] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0060] Embodiment 1

[0061] In order to solve the problem that the environmental chamber with dynamic sealing structure is prone to hydrogen leakage, such as Figure 1 As shown, in an embodiment of the present invention, a mechanical property test environment box is provided, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and includes a box cover 71, a box body 74, a stretching mechanism and a control mechanism;

[0062] The box cover 71 and the box body 74 are detachably sealed; the stretching mechanism includes an upper clamp 75, a lower clamp 77, a hydraulic transmission module, and a hydraulic drive module provided inside the box body 74, wherein the hydraulic transmission module includes a hydraulic rod 85, a hydraulic cylinder 79, and a hydraulic piston 87; the upper clamp 75 for fixing the upper end of the sample 76 is fixedly connected to the box cover 71; the lower clamp 77 for fixing the lower end of the sample 76 is fixedly connected to the upper end of the hydraulic rod 85;

[0063] The control mechanism is arranged outside the box body 74, and the hydraulic drive module is connected to the control mechanism circuit.

[0064] The inventive ideas of the embodiments of the present invention include: In the prior art, the inside and outside of the environmental box are connected by a dynamic sealing structure, which can easily lead to hydrogen leakage in a high-pressure environment such as a gaseous hydrogen pressure environment, thereby increasing the risk of the experiment.

[0065] Based on this, in an embodiment of the present invention, all components involving hydrogen are arranged in a closed cavity, and hydraulic oil is input into the hydraulic transmission module through the hydraulic drive component to make the hydraulic piston move downward. The hydraulic rod head moves downward and drives the lower clamp to stretch downward, thereby achieving the stretching of the sample; by adjusting the work done by the hydraulic drive module, the pressure value in the hydraulic cylinder can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp, thereby achieving the control of the stretching force of the sample; because in the embodiment of the present invention, it is no longer necessary to set a dynamic sealing structure on the sealing box to transmit force to the sample, so the problem of gas leakage in the environmental box due to failure of the dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation.

[0066] Furthermore, in the embodiment of the present invention, the box cover 71 and the box body 74 are fixedly connected by fastening bolts 73; the upper clamp 75 is fixedly connected to the box cover 71 by bolts 80; the lower clamp 77 is fixedly connected to the upper end of the hydraulic rod 85 (hydraulic rod head 84) by bolts 78; the hydraulic rod 85 and the hydraulic cylinder 79 are sealed by a sealing ring 86, which can ensure the sealing between the inside and outside of the hydraulic cylinder 79 when the hydraulic rod 85 reciprocates; in addition, sealing rings 72 and sealing rings 81 are respectively provided in the grooves on both sides of the top wall of the box cover, and the connecting surfaces of the box cover 71 and the box body 74 are sealed by the sealing rings 72 and 81; thereby, the sealing effect of the entire environmental box is better.

[0067] In the embodiment of the present invention, the hydraulic rod 85 and the hydraulic cylinder 79 are connected in a sliding seal, thereby achieving transmission in a sealed state.

[0068] In the embodiment of the present invention, interfaces corresponding to the oil pressure pipeline 28 and the oil return pipeline 30 are set on the hydraulic cylinder 79; at the same time, interfaces corresponding to the oil pressure pipeline 28 and the oil return pipeline 30 are also set at the position corresponding to the hydraulic cylinder 79 on the environmental box 74; the hydraulic drive component 29 is connected to the oil tank 31 through the pipeline, and the hydraulic drive component 29 can deliver hydraulic oil to the hydraulic transmission component through the oil pressure pipeline 28, thereby pushing the piston to move downward; in addition, the excess hydraulic oil in the hydraulic cylinder 79 can be returned to the oil tank 31 through the return oil pipeline 30, thereby reducing the oil consumption of the hydraulic oil.

[0069] In actual application, the hydraulic drive component 29 is fixedly connected between the hydraulic cylinder 79 and the hydraulic piston 87 through the oil pressure pipeline 28, so that the hydraulic oil enters the upper part of the hydraulic cylinder 79 and can move the hydraulic piston 87 downward.

[0070] Furthermore, in order to maintain the force balance of the sample to ensure the experimental effect, in the embodiment of the present invention, the hydraulic transmission component, the upper clamp 75, the lower clamp 77 and the box 74 are all on the same vertical axis, so that the sample will be more stable.

[0071] Furthermore, in an embodiment of the present invention, the environmental chamber also includes a pressure sensing module and a mechanical performance testing module disposed in the box body 74; the lead holes on the pressure sensing module and the mechanical performance testing module box body 74 are connected to the control mechanism circuit.

[0072] In practical applications, the environmental chamber can be placed on a test bench, which can make the test operation safer and more convenient; a detection module is placed above the environmental chamber to detect the moisture content, gas concentration and pressure value of the environmental chamber.

[0073] In addition, a performance measurement component 83 may be provided on the sample 76 to check the displacement of the sample when stretched.

[0074] Furthermore, in the embodiment of the present invention, the hydraulic drive component 29 delivers hydraulic oil to the hydraulic cylinder 79 through the oil pressure pipeline 28, so that pressure is generated in the hydraulic cylinder 79, which will cause the hydraulic piston 87 to move downward, and while the hydraulic rod head 84 moves downward, it drives the lower clamp 77 to generate a downward pulling force; by adjusting the work done by the hydraulic drive component 29, the pressure value in the hydraulic cylinder 79 can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp 77, thereby realizing the control of the tensile force of the sample.

[0075] In addition, nitrogen and hydrogen (or one of the gases) are filled into the environmental box through the inflation port of the box body 74, and the pressure value in the environmental box is transmitted through the pressure sensing module; if the pressure value in the environmental box exceeds the preset pressure parameter value, the air can be exhausted and the pressure can be reduced through the outlet of the box body 74, so that the ambient pressure in the environmental box is reduced to the preset pressure parameter value.

[0076] The actual tensile force value of the sample under different currents can be obtained through the mechanical property testing module, and the mechanical property parameter value of the material of the sample in the gaseous environment can be obtained in combination with the tensile displacement of the sample.

[0077] The specific implementation of the present invention is described below in conjunction with a specific application scenario. Figure 1 and Figure 3 In this specific application scenario, the performance measurement component 83 is assembled on the sample 76, and the sample 76 is assembled on the upper fixture 75 and the lower fixture 77; the fixed integrated structure with the performance measurement component 83, the sample 76, the upper fixture 75 and the lower fixture 77 is fixedly assembled on the hydraulic rod head 84 by bolts 78; the position of the hydraulic rod head 84 is adjusted by the hydraulic drive module so that the upper fixture 75 is flush with the upper port of the box body 74; then the box body cover 71 is covered, and the fixing bolts 80 of the upper fixture 75 and the box body cover 71 are tightened in a symmetrical installation sequence, and the fastening bolts 73 and fastening bolts 82 of the box body cover 71 and the box body 74 are tightened in the same way. It should be noted that when the sample 76 and related components are assembled, it is assumed that the relevant lines are all well configured and connected through the lead holes.

[0078] First, purge the environmental box with nitrogen, open the nitrogen bottle 7, valve 5, valve 12 and valve 13, and open valve 19 and check valve 10 at the same time. It should be noted that while purging, pay attention to the readings of the oxygen concentration detector 26 and the moisture detector 21 to confirm whether the oxygen and water content meet the test requirements. If the volume of oxygen is less than 1×10 -6 or the volume of water 5×10 -6 If the requirements are not met, continue nitrogen purging. If the requirements are met, stop purging, close the nitrogen bottle 7, valve 5, valve 12 and valve 13 in sequence, and also close valve 19 and one-way valve 10.

[0079] When the oxygen and water content in the environmental box meets the test requirements, fill the environmental box with hydrogen, open the hydrogen bottle 8, valve 4, valve 12 and valve 13, and open valve 14 and valve 15 in front of burner 16 at the same time, observe the reading of hydrogen concentration detector 20 to confirm whether the hydrogen content meets the test requirements. If not, continue to fill with hydrogen; if it does, close valve 19 and valve 15 in front of the burner in turn, continue to fill with hydrogen, and monitor the reading of pressure gauge 25 until the reading of pressure gauge 25 reaches the test pressure requirement, close valve 4, valve 12, valve 13, valve 14 and valve 15 in front of burner 16, and stabilize the pressure of the environmental box for a period of time, for example, 24 hours.

[0080] After the pressure in the environmental chamber is stabilized, the hydraulic drive component 29 is energized, and the hydraulic drive component 29 delivers hydraulic oil to the hydraulic cylinder 79, generating pressure in the hydraulic cylinder 79, which will cause the hydraulic piston 87 to move downward, and while the hydraulic rod head 84 moves downward, it drives the lower clamp 77 to generate a downward pulling force; by adjusting the work done by the hydraulic drive component 29, the pressure value in the hydraulic cylinder 79 can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp 77, thereby realizing the control of the tensile force of the sample.

[0081] In addition, after the test is completed, open valve 19 and valve 15 in front of burner 16 until the pressure in the environmental box drops to a certain level, then open valve 5, valve 12, valve 13 and valve 14 to fill the environmental box with nitrogen, and after the hydrogen concentration in the environmental box drops to meet safety requirements, close valve 5, valve 12, valve 13 and valve 14, and at the same time close valve 19 and valve 15 in front of burner 16.

[0082] In summary, the present invention provides a mechanical properties testing environment box, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and includes a box cover, a box body, a stretching mechanism and a control mechanism; the box cover and the box body are detachably and airtightly connected; the stretching mechanism includes an upper clamp, a lower clamp, a hydraulic transmission module and a hydraulic drive module, wherein: the upper clamp used to fix the upper end of the sample is fixedly connected to the box cover; the lower clamp used to fix the lower end of the sample is fixedly connected to the hydraulic rod head of the hydraulic transmission module; the hydraulic drive module and the control mechanism are both arranged outside the box; the hydraulic transmission module is connected to the hydraulic drive module through a pipeline; the hydraulic drive module is connected to the control mechanism circuit; all components involving hydrogen are arranged in a closed cavity, hydraulic oil is input into the hydraulic transmission module through the hydraulic drive module, the hydraulic piston moves downward, and the lower clamp is driven to stretch downward while the hydraulic rod head moves downward, thereby achieving stretching of the sample.

[0083] The working principle of the mechanical property testing environment box of the present invention is that the hydraulic oil is transported to the hydraulic cylinder through the hydraulic drive module to generate pressure in the hydraulic cylinder, which will cause the hydraulic piston to move downward, and the lower clamp is driven to generate a downward pulling force while the hydraulic rod head moves downward; by adjusting the work done by the hydraulic drive component, the pressure value in the hydraulic cylinder can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp, thereby realizing the control of the tensile force of the sample.

[0084] Since it is no longer necessary to provide a dynamic sealing structure on the sealed box to transmit force to the sample in the embodiment of the present invention, the problem of gas leakage in the environmental box due to dynamic seal failure in the environmental box with a dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation, further reducing the risk of the test.

[0085] The present invention provides effective safeguard measures for the safety of mechanical property testing by arranging all components involving hydrogen in a closed cavity and arranging a control mechanism outside the closed cavity, thereby completely isolating a test area from an operating area.

[0086] In addition, the environmental box in the embodiment of the present invention has a simple structure and is easy and quick to assemble, making the test operation convenient, thereby providing an effective way and means for evaluating the mechanical properties of materials in a high-pressure gaseous hydrogen environment.

[0087] Embodiment 2

[0088] The embodiment of the present invention is adapted to the mechanical properties test environment box in the above-mentioned embodiment 1, and further provides a mechanical properties test method. That is, the mechanical properties test method in the embodiment of the present invention can be implemented using the mechanical properties test environment box in the embodiment 1. Figure 2 As shown, the specific steps include:

[0089] S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box, gas concentration parameter values ​​of the preset gas, and moisture parameter values;

[0090] In the embodiment of the present invention, the preset gas type may be hydrogen and / or nitrogen. In a specific application scenario, nitrogen and hydrogen may be filled into the environmental box, or any one of the gases may be filled according to the test requirements.

[0091] S12, calculating the pressure value in the hydraulic cylinder according to the pulling force value required by the experiment;

[0092] S13, controlling the gas concentration of the environmental box to reach the gas concentration parameter value through a control mechanism; and at the same time, the moisture content reaches the moisture parameter value;

[0093] In the embodiment of the present invention, it is first necessary to confirm that the content of oxygen and water meets the test requirements. According to the experience of technicians in this field or limited experiments, if the volume of oxygen is less than 1×10 -6 or the volume of water 5×10 -6 , the requirement is not met and nitrogen purging needs to continue. If this requirement is met, stop purging nitrogen.

[0094] S14. When the ambient pressure in the environmental box reaches the pressure parameter value, the pressure value in the hydraulic cylinder is controlled by the control mechanism to adjust the downward pulling force of the hydraulic rod to the pulling force value required for the experiment.

[0095] In an embodiment of the present invention, when the ambient pressure in the environmental chamber reaches the pressure parameter value, it also includes: stabilizing the pressure of the environmental chamber, for example, stabilizing the pressure for 24 hours; by adjusting the work done by the hydraulic drive component through the control mechanism, the pressure value in the hydraulic cylinder can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp.

[0096] Furthermore, in the embodiment of the present invention, it also includes:

[0097] S15. According to the actual tensile force value of the sample and the tensile displacement of the sample, the mechanical property parameter value of the material of the sample in the gaseous environment is obtained.

[0098] In the embodiment of the present invention, the actual tension value of the sample under different hydraulic oil amounts in the hydraulic cylinder can be obtained by the mechanical property testing module, and then combined with the tensile displacement of the sample under the tension, the mechanical property parameter value of the sample material in the gaseous environment can be obtained.

[0099] In summary, the present invention provides a mechanical properties testing environment box, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and includes a box cover, a box body, a stretching mechanism and a control mechanism; the box cover and the box body are detachably and airtightly connected; the stretching mechanism includes an upper clamp, a lower clamp, a hydraulic transmission module and a hydraulic drive module, wherein: the upper clamp used to fix the upper end of the sample is fixedly connected to the box cover; the lower clamp used to fix the lower end of the sample is fixedly connected to the hydraulic rod head of the hydraulic transmission module; the hydraulic drive module and the control mechanism are both arranged outside the box body; the hydraulic transmission module is connected to the hydraulic drive module through a pipeline; the hydraulic drive module is connected to the control mechanism circuit; all components involving hydrogen are arranged in a closed cavity, hydraulic oil is input into the hydraulic transmission module through the hydraulic drive module, the hydraulic piston moves downward, and the lower clamp is driven to stretch downward while the hydraulic rod head moves downward, thereby achieving stretching of the sample.

[0100] The working principle of the mechanical property testing environment box of the present invention is that the hydraulic drive module delivers hydraulic oil to the hydraulic cylinder to generate pressure in the hydraulic cylinder, which will cause the hydraulic piston to move downward, and while the hydraulic rod head moves downward, it drives the lower clamp to generate a downward pulling force; by adjusting the work done by the hydraulic drive component, the pressure value in the hydraulic cylinder can be controlled, thereby achieving the purpose of adjusting the downward pulling force of the lower clamp, thereby realizing the control of the tensile force of the sample.

[0101] Since it is no longer necessary to provide a dynamic sealing structure on the sealed box to transmit force to the sample in the embodiment of the present invention, the problem of gas leakage in the environmental box due to dynamic seal failure in the environmental box with a dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation, further reducing the risk of the test.

[0102] The present invention provides effective safeguard measures for the safety of mechanical property testing by arranging all components involving hydrogen in a closed cavity and arranging a control mechanism outside the closed cavity, thereby completely isolating a test area from an operating area.

[0103] In addition, the environmental box in the embodiment of the present invention has a simple structure and is easy and quick to assemble, making the test operation convenient, thereby providing an effective way and means for evaluating the mechanical properties of materials in a high-pressure gaseous hydrogen environment.

[0104] Embodiment 3

[0105] The embodiment of the present invention further provides a mechanical property testing system, including an air supply mechanism, an environmental chamber, a detection module and a post-processing mechanism, all of which are arranged in a closed cavity; wherein the environmental chamber includes the mechanical property testing environmental chamber in the first embodiment, such as Figure 3 As shown,

[0106] The gas supply mechanism includes a gas supply unit for conveying a preset gas, and a booster pump 3 for pressurizing the preset gas; the post-processing mechanism includes a waste gas recovery tank 9 for recovering the environmental box, and a burner 16 for treating hydrogen discharged from the environmental box; the detection module includes an oxygen concentration detector 26, a moisture detector 21, a hydrogen concentration detector 20, and a pressure gauge 25; the detection module is used to detect the moisture content, gas concentration and pressure value of the environmental box;

[0107] The air supply mechanism, environmental box, detection module and exhaust gas recovery tank 9 are all arranged in a closed cavity; the air supply unit is connected to the booster pump and the environmental box through pipelines respectively; the environmental box is connected to the burner 16 and the exhaust gas recovery tank 9 through pipelines respectively; a detection module is provided above the environmental box.

[0108] In an embodiment of the present invention, the gas supply unit includes a hydrogen bottle 7 and a hydrogen bottle 8 (it can also be one of them); and the hydrogen bottle 7 and the hydrogen bottle 8 are fixed on the bracket 6, and valves are installed on each branch pipeline of the gas outlet of the nitrogen bottle 6 and the hydrogen bottle 7; valves are installed on the inlet and outlet pipelines of the booster pump 3, and valves 14 are installed on the inlet pipeline 11 and the outlet pipeline 18 near the air inlet of the environmental box, and valve 19 is installed near the air outlet, and a one-way valve 10 is installed on the air inlet pipeline of the waste gas recovery tank 9.

[0109] An oxygen concentration detector 26, a moisture detector 21, a hydrogen concentration detector 20 and a pressure gauge 25 are arranged above the environmental box 27, and are used to detect the moisture content, gas concentration and pressure value of the environmental box.

[0110] Furthermore, in an embodiment of the present invention, the enclosed cavity includes an explosion-proof cabinet 1; a hydrogen detector 2 and a flame detector 24 are respectively provided at the corners of the inner top wall of the explosion-proof cabinet 1; an alarm 23 and an exhaust system 22 are provided on the outer top wall of the explosion-proof cabinet 1.

[0111] In the embodiment of the present invention, the entire mechanical properties test system is placed inside the explosion-proof cabinet 1, and the hydrogen detector 2 and the flame detector 24 are respectively installed at the corners of the top cabinet of the explosion-proof cabinet 1; and the control mechanism is arranged outside the explosion-proof cabinet 1, and the test area is completely isolated from the operation area, which provides an effective safeguard for the safety of the mechanical properties test. In addition, an exhaust system is installed on the top of the explosion-proof cabinet 1 for emptying and ventilating the test space; an alarm 23 is installed outside the explosion-proof cabinet 1, and when the hydrogen detector 2 detects hydrogen leakage, or the flame detector 24 detects flame, the alarm 23 will sound an alarm.

[0112] In order to ensure the safety inside the explosion-proof cabinet 1, in the embodiment of the present invention, the burner 16 is arranged above the outer top wall of the explosion-proof cabinet 1 to burn the hydrogen discharged during the test.

[0113] Furthermore, in the embodiment of the present invention, the gas supply mechanism, the detection module, the hydrogen detector 2 and the flame detector 24 are all connected to the control mechanism 32; and the entire process of the mechanical property test is controlled by the control mechanism 32.

[0114] Furthermore, in an embodiment of the present invention, valves are respectively provided on each branch pipeline of the gas supply unit, the inlet of the boost pump 13, the outlet of the boost pump 13, the pipeline connecting the environmental box 27 and the gas supply unit, and the pipeline connecting the environmental box 27 and the post-processing mechanism; by respectively providing valves on each branch pipeline of the gas supply unit, the inlet of the boost pump 13, the outlet of the boost pump 13, and each pipeline connecting the environmental box 27 and the gas supply unit, the type and amount of gas entering the environmental box 27 can be controlled; the one-way valve 10 can make all the exhaust gas in the test process enter the exhaust gas recovery tank 9; by installing a valve 15 on the pipeline 17 between the environmental box 27 and the burner 16, the hydrogen in the test process can smoothly enter the burner 16, thereby providing a safeguard for the safety of the test.

[0115] In practical applications, the environmental chamber 27 can be placed on the test bench 33, which can make the test operation safer and more convenient.

[0116] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0117] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0119] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0120] It should be understood that in the embodiments of the present application, the various embodiments and features can be combined with each other to solve the aforementioned technical problems.

[0121] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0122] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical properties test environment box, used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, characterized in that: It includes a box cover, a box body, a stretching mechanism and a control mechanism; The box cover and the box body are detachably and tightly connected; The stretching mechanism includes an upper clamp, a lower clamp, a hydraulic transmission module arranged in the box body, and a hydraulic drive module arranged outside the box body, wherein: The hydraulic transmission module includes a hydraulic rod, a hydraulic cylinder and a hydraulic piston; the upper clamp used to fix the upper end of the sample is fixedly connected to the box cover; the lower clamp used to fix the lower end of the sample is fixedly connected to the upper end of the hydraulic rod; The control mechanism is arranged outside the box; the hydraulic drive module is connected to the control mechanism circuit.

2. The mechanical properties testing environment chamber according to claim 1, characterized in that: The connection mechanism between the box cover and the box body comprises: A fastening bolt used for sealingly connecting the box cover and the box body, and a sealing ring arranged in a groove on the top wall of the box cover.

3. The mechanical properties testing environment chamber according to claim 2, characterized in that: The hydraulic transmission module comprises: The hydraulic rod and the hydraulic cylinder are connected in a sliding seal.

4. The mechanical properties testing environment chamber according to claim 3, characterized in that: The hydraulic transmission component, the upper clamp, the lower clamp and the box are all on the same vertical axis.

5. The mechanical properties testing environment chamber according to claim 1, characterized in that: It also includes a pressure sensing module and a mechanical performance testing module disposed in the box: The pressure sensing module and the mechanical property testing module are both connected to the control mechanism circuit.

6. The mechanical properties testing environment chamber according to claim 5, characterized in that: The box body is provided with lead holes for connecting the pressure sensing module and the mechanical property testing module.

7. The mechanical properties testing environment chamber according to claim 6, characterized in that: Also includes: A connection mechanism used for fixed connection with a test bench.

8. A mechanical property testing method, applicable to the mechanical property testing environment box as claimed in any one of claims 1 to 7, characterized in that: Includes steps: S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box, gas concentration parameter values ​​of the preset gas, and moisture parameter values; S12, calculating the pressure value in the hydraulic cylinder according to the pulling force value required by the experiment; S13, controlling the gas concentration of the environmental box to reach the gas concentration parameter value through a control mechanism; and at the same time, the moisture content reaches the moisture parameter value; S14. When the ambient pressure in the environmental box reaches the pressure parameter value, the pressure value in the hydraulic cylinder is controlled by the control mechanism to adjust the downward pulling force of the hydraulic rod to the pulling force value required for the experiment.

9. The mechanical properties testing method according to claim 8, characterized in that: Also includes: S15. According to the actual tensile force value of the sample and the tensile displacement of the sample, the mechanical property parameter value of the material of the sample in the gaseous environment is obtained.

10. The mechanical properties testing method according to claim 9, characterized in that: When the environmental pressure in the environmental box reaches the pressure parameter value, the method further includes: The environmental chamber is pressurized.

11. A mechanical properties testing system, characterized in that: It includes an air supply mechanism, an environmental chamber, a detection module and a post-processing mechanism, all of which are arranged in a closed cavity; wherein the environmental chamber includes the mechanical properties test environmental chamber as described in any one of claims 1 to 7; The gas supply mechanism includes a gas supply unit for delivering a preset gas, and a booster pump for pressurizing the preset gas; The post-processing mechanism includes a waste gas recovery tank for recovering the environmental box, and a burner for treating hydrogen discharged from the environmental box; The detection module includes an oxygen concentration detector, a hydrogen concentration detector, a moisture detector and a pressure gauge; the detection module is used to detect the moisture content, gas concentration and pressure value of the environmental box; The air supply unit is connected to the booster pump and the environmental box through pipelines respectively; the environmental box is connected to the burner and the exhaust gas recovery tank through pipelines respectively; a detection module is provided above the environmental box.

12. The mechanical properties testing system according to claim 11, characterized in that: The enclosed cavity includes an explosion-proof cabinet; A hydrogen detector and a flame detector are respectively provided at the corners of the inner top wall cabinet of the explosion-proof cabinet; The outer top wall of the explosion-proof cabinet is provided with an alarm and an exhaust system.

13. The mechanical properties testing system according to claim 12, characterized in that: The burner is arranged above the outer top wall of the explosion-proof cabinet.

14. The mechanical properties testing system according to claim 13, characterized in that: The gas supply mechanism, the detection module, the hydrogen detector, and the flame detector are all connected to the control mechanism.

15. The mechanical properties testing system according to claim 14, characterized in that: The gas supply unit includes a hydrogen cylinder and / or a nitrogen cylinder.

16. The mechanical properties testing system according to claim 15, characterized in that: It includes valves, which are respectively arranged at: The branch pipelines of the air supply unit, the inlet of the booster pump, the outlet of the booster pump, the pipeline connecting the environmental box with the air supply unit, and the pipeline connecting the environmental box with the post-processing mechanism.

Images