Mechanical property testing environment box and mechanical property testing method

Abstract

The invention discloses a mechanical property testing environment box and a mechanical property testing method.The mechanical property testing environment box comprises a first box body, a second box body, a lower bottom plate, a motor, a control mechanism and a stretching mechanism; the top of the first box body and the top of the second box body are detachably connected in a sealed mode. The second box body is detachably connected with the lower bottom plate in a sealed manner; the motor is arranged in the first box body; the stretching mechanism is arranged in the second box body; the stretching mechanism comprises an upper clamp, a lower clamp, a threaded sleeve, a screw rod and a support frame; the upper clamp for fixing the upper end of the sample is fixedly connected with the threaded sleeve; a lower clamp for fixing the lower end of the sample is fixedly connected with the lower bottom plate; the lower part of the screw rod is a connecting part which is in threaded connection with the threaded sleeve; the upper end of the screw rod is fixedly connected with the motor; the supporting frame comprises more than two supporting arms and is used for adjusting the vertical position of the threaded sleeve in the second box body; according to the invention, the problem of gas leakage in the environment box caused by dynamic seal failure is avoided.

Description

Technical Field

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

[0002] The role of hydrogen in the world's energy transformation is becoming increasingly prominent. In recent years, major developed countries in the world have introduced policies to strongly support the development of the hydrogen energy industry. Countries and regions such as the United States, Japan, the European Union, Australia, and South Korea have successively formulated hydrogen energy development strategies or plans. As the world's largest hydrogen producer, my country has both hydrogen supply conditions and hydrogen use markets for large-scale utilization of hydrogen energy, and the hydrogen energy industry has great economic development potential.

[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 of the tests are conducted in environmental chambers to simulate high-pressure hydrogen environments. This performance test method places strict requirements on the sealing, safety and reliability of the environmental chambers. In particular, the sealing of the moving parts is particularly critical in the test device, and most of the environmental chambers in existing test devices use dynamic sealing structures.

[0005] The inventors have found through research that the environmental chamber in the test 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, an environmental box 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 environment box and a mechanical property testing method capable of preventing hydrogen leakage.

[0009] The present 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 first box body, a second box body, a lower bottom plate, a motor, a control mechanism and a stretching mechanism;

[0010] The top of the first box body and the top of the second box body are detachably connected in a sealed manner; the second box body and the lower bottom plate are detachably connected in a sealed manner;

[0011] The motor is disposed in the first housing; the stretching mechanism is disposed in the second housing;

[0012] The stretching mechanism comprises an upper clamp, a lower clamp, a threaded sleeve, a screw and a support frame, wherein:

[0013] The upper fixture for fixing the upper end of the sample is fixedly connected to the threaded sleeve; the lower fixture for fixing the lower end of the sample is fixedly connected to the lower base plate; the lower part of the screw is a connecting part for threaded connection with the threaded sleeve; the upper end of the screw is fixedly connected to the motor;

[0014] The support frame includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with the slide groove of the inner wall of the second box body; the other end of each support arm is fixedly connected to the threaded sleeve;

[0015] The connecting wire of the control mechanism passes through the box wall of the first box body and is connected to the motor circuit.

[0016] Preferably, in an embodiment of the present invention, the connection structure between the first box body, the second box body and the lower base plate comprises:

[0017] A first fastening bolt for tightly connecting the first box body and the second box body;

[0018] A second fastening bolt for tightly connecting the second box body and the lower base plate;

[0019] Sealing rings are respectively arranged in the groove of the outer top wall of the second box body and in the groove of the lower bottom plate.

[0020] Preferably, in an embodiment of the present invention, the screw rod passes through a sealing bearing disposed on the top of the second housing and is threadedly connected to the threaded sleeve.

[0021] Preferably, in an embodiment of the present invention, a plurality of support arms are provided circumferentially of the threaded sleeve.

[0022] Preferably, in an embodiment of the present invention, the support frame comprises:

[0023] The support frame is in a cross shape or a cross shape.

[0024] Preferably, in an embodiment of the present invention, the motor is disposed in the first housing, and includes:

[0025] The motor is connected to the control mechanism circuit via a lead hole provided in the first box body.

[0026] Preferably, in the embodiment of the present invention, it also includes:

[0027] A pressure sensing module and / or a mechanical property testing module is arranged in the second housing; the pressure sensing module and / or the mechanical property testing module is connected to the control mechanism circuit.

[0028] Preferably, in the embodiment of the present invention, it also includes:

[0029] The second box body or the bottom plate is provided with lead holes for connecting the pressure sensing module and / or the mechanical property testing module.

[0030] Preferably, in an embodiment of the present invention, the support arm comprises:

[0031] The supporting arm is a bar-shaped rod.

[0032] 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:

[0033] S11, presetting the environmental parameters of the test chamber; the environmental parameters include the preset gas type and the corresponding pressure parameter value in the environmental chamber;

[0034] S12, calculating the corresponding number of revolutions and / or torque of the motor according to the pulling force value required by the experiment;

[0035] S13. When the ambient pressure in the environmental box reaches the pressure parameter value, the number of revolutions and / or torque of the motor is controlled to adjust the upward pulling force of the upper clamp to the pulling force value required for the experiment.

[0036] Preferably, in the embodiment of the present invention, it also includes:

[0037] S14. 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.

[0038] Preferably, in an embodiment of the present invention, the preset gas types include:

[0039] Nitrogen and / or hydrogen.

[0040] 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:

[0041] Stabilize the environmental chamber.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention provides a mechanical property test environment box, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and comprises a first box body, a second box body, a lower bottom plate, a motor, a control mechanism and a stretching mechanism; the stretching mechanism comprises an upper clamp, a lower clamp, a threaded sleeve, a screw and a support frame, wherein the support frame comprises more than two support arms; one end of each support arm comprises a connecting portion for sliding connection with a slide groove on the inner side wall of the first box body; the other end of each support arm is fixedly connected to the threaded sleeve, thereby realizing a sliding connection between the support frame and the second box body; the upper clamp for fixing the upper end of the sample is fixedly connected to the threaded sleeve; the lower clamp for fixing the lower end of the sample The clamp is fixedly connected to the lower base plate; the lower part of the screw is a connecting part for threaded connection with the threaded sleeve; the upper end of the screw is fixedly connected to the motor; the top of the first box body and the second box body are detachably sealed; the second box body and the lower base plate are detachably sealed; the motor is arranged in the first box body; the stretching mechanism is arranged in the second box body; thereby, the entire stretching mechanism can be sealed in the environmental chamber; the connecting line of the control mechanism passes through the first box body and is connected to the motor circuit; by energizing the motor, the motor generates torque and drives the screw to rotate upward, so that the threaded sleeve also rotates upward in a spiral, thereby also driving the upper clamp to move upward to achieve stretching of the sample.

[0044] The working principle of the mechanical property testing environment box of the present invention is that after the motor is connected to the power supply, the motor starts to rotate and generate torque, at which time the screw starts to rotate upward, thereby driving the threaded sleeve to move upward, thereby generating an upward pulling force on the threaded sleeve and the upper clamp connected to the threaded sleeve; by adjusting the power-on time and current of the motor, the rotation action of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp, thereby realizing the control of the tensile force of the sample.

[0045] 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.

[0046] 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

[0047] 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.

[0048] Figure 1 It is a structural schematic diagram of the mechanical properties test environment box in the present invention;

[0049] Figure 2 It is a step diagram of the mechanical property testing method in the present invention. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Embodiment 1

[0054] 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 mechanical property testing of materials under a gaseous hydrogen pressure environment, and includes a first box body 15, a second box body 7, a lower bottom plate 16, a motor 1, a control mechanism 18 and a stretching mechanism;

[0055] The first box 15 and the top of the second box 7 are detachably sealed and connected; the second box 7 and the lower bottom plate 16 are detachably sealed and connected; the motor 1 is arranged in the first box 15; and the stretching mechanism is arranged in the second box 7;

[0056] The stretching mechanism includes an upper fixture 9, a lower fixture 12, a threaded sleeve 5, a screw rod 4 and a support frame 6, wherein: the upper fixture 9 for fixing the upper end of the sample is fixedly connected to the threaded sleeve 5; the lower fixture 12 for fixing the lower end of the sample is fixedly connected to the lower base plate 16; the lower part of the screw rod 4 is a connecting part for threaded connection with the threaded sleeve 5; the upper end of the screw rod 4 is fixedly connected to the motor 1;

[0057] The support frame 6 includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with the slide groove 8 on the inner wall of the second box body 7; the other end of each support arm is fixedly connected to the threaded sleeve 5; the connecting line of the control mechanism passes through the first box body 15 and is connected to the motor 1 circuit.

[0058] The inventive concept of the embodiment of the present invention includes: the environmental box with a dynamic sealing structure in the prior art is prone to hydrogen leakage in a high-pressure environment such as a gaseous hydrogen pressure environment, thereby increasing the risk of the experiment.

[0059] Based on this, in an embodiment of the present invention, the entire stretching mechanism is placed in a closed environmental chamber, and after the motor 1 is connected to the current, the motor 1 starts to rotate and generate torque, at which time the screw 4 starts to rotate upward, thereby driving the threaded sleeve 5 to move upward; this will generate an upward pulling force on the threaded sleeve 5 and the upper clamp 9 connected to the threaded sleeve 5; by adjusting the power-on time and current of the motor 1, the rotation action of the screw 4 (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp 9, thereby achieving the control of the stretching force of the sample 11; since in the embodiment of the present invention the entire stretching mechanism is completely placed in a closed environmental chamber, it is no longer necessary to set a dynamic sealing structure on the sealed box body to transmit force to the sample 11, thereby effectively avoiding the problem of gas leakage in the environmental chamber due to failure of the dynamic sealing structure in the prior art, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation.

[0060] Furthermore, in an embodiment of the present invention, the first box body 15 and the second box body 7 are fixedly connected by a first fastening bolt, and the second box body 7 and the lower base plate 16 are fixedly connected by a second fastening bolt 17; the lower clamp 12 is fixedly connected to the lower base plate 16 by a bolt 13; the upper clamp 9 is fixedly connected to the threaded sleeve 5 by a bolt 10, and the lower part of the screw rod 4 is a connecting part for threaded connection with the threaded sleeve 5; the upper end of the screw rod 4 is fixedly connected to the motor 1; the motor 1 is arranged in the first box body 15; the stretching mechanism is arranged in the second box body 7; in addition, sealing rings are respectively provided in the grooves of the first box body 15, the second box body 7 and the lower base plate 16, and the connecting surfaces of the first box body 15 and the second box body 7, as well as the connecting surfaces of the second box body 7 and the lower base plate 16 are respectively sealed by the sealing rings; thereby the sealing effect of the entire environmental chamber is better.

[0061] In the embodiment of the present invention, the first box body 15 and the top of the second box body 7 are connected to form a closed cavity (first cavity); the second box body 7 and the lower base plate 16 are connected to form a closed cavity (second cavity).

[0062] In practical applications, the second cavity can be assembled first, and then the motor 1 can be fixedly connected to the screw rod 4, and then the first box 15 can be aligned with the sealing ring and the bolt hole and fixed to the second box 7 in a symmetrical installation order (i.e., the first cavity can be assembled). In practical applications, the motor 1 can also be detachably connected to the second box 7 (not shown in the figure), that is, the motor 1 can be fixedly connected to the top of the outer top wall of the second box 7 first, and then the first box 15 can be fixedly connected to the second box 7; in this way, the stability of the motor 1 set in the first box 15 can be maintained during operation.

[0063] In the embodiment of the present invention, the support frame 6 includes more than two strip-shaped support arms, each of which is slidably connected to the slide groove 8 on the inner wall of the second box body 7 through a connecting portion at one end; the other end of each support arm is fixedly connected to the threaded sleeve 5. The support frame 6 can be set as two support arms, each of which is slidably connected to the slide groove 8 on the inner wall of the second box body 7 through a connecting portion at one end, and the other end of each support arm is arranged on symmetrical sides of the threaded sleeve 5; this can ensure the balance and stability of the threaded sleeve 5 and the upper clamp 9.

[0064] In order to make the upper fixture 9 stably fix the upper end of the sample, in the embodiment of the present invention, the threaded sleeve 5 is provided with a plurality of support arms in the circumferential direction, and the plurality of support arms can be provided as a cross-shaped support frame or a cross-shaped support frame, so that the upper fixture 9 and the threaded sleeve 5 are more stable. In addition, the connection part at one end of each support arm and the slide groove 8 can be provided as an interference fit, so that the upper fixture 9 and the threaded sleeve 5 are more stable.

[0065] In addition, the support frame 6 can also be arranged on both sides of the threaded sleeve 5, and it can be four support arms that are parallel to each other. Each support arm is slidably connected to the slide groove 8 on the inner wall of the second box body 7 through a connecting part at one end, and the other end of each support arm is fixedly connected to the threaded sleeve 5, which can ensure the balance and stability of the threaded sleeve 5 and the upper clamp 9.

[0066] In addition, according to the shape of the environmental chamber, the support frame 6 can also be set as three support arms, and each support arm is slidably connected to the slide groove 8 on the inner wall of the second box body 7 through a connecting part at one end; the other end of each support arm is fixedly connected to the threaded sleeve 5 to form a Y shape, which can also ensure the balance and stability of the threaded sleeve 5 and the upper clamp 9.

[0067] In the embodiment of the present invention, the slide groove 8 can be set as a groove track, and the support frame 6 can be adjusted to move up and down by the groove track, thereby adjusting the position of the upper clamp 9 to achieve precise control of the tensile direction of the sample.

[0068] Furthermore, in an embodiment of the present invention, the screw 4 passes through a sealed bearing 2 provided at the top of the second box body 7 and is threadedly connected to a threaded sleeve 5; the bearing sealing structure 3 can ensure better sealing inside the second box body 7; in addition, by supporting the rotation of the screw 4 through the bearing 2, the friction coefficient during the rotation process can be reduced, and the rotation accuracy of the screw 4 can also be ensured.

[0069] Furthermore, in the embodiment of the present invention, the motor 1 is disposed in the first housing 15, and the motor 1 is connected to the control mechanism 18 circuit through the lead hole of the first housing, so that the motor 1 can be controlled by the control mechanism 18 outside the housing.

[0070] The embodiment of the present invention can avoid hydrogen leakage without increasing the space of the second box (for placing the stretching mechanism) by providing a first box for placing the motor 1. In practical applications, an inert gas can be filled in the first cavity to reduce hydrogen leakage from the second cavity to the first cavity, and reduce the risk of explosion caused by hydrogen leakage.

[0071] Furthermore, in the embodiment of the present invention, the motor 1 is connected to the external control mechanism 18 through the lead hole on the upper top wall of the first box body 15; the motor 1 starts to rotate and generate torque after being connected to the power supply, at which time the screw starts to rotate upward, and then drives the threaded sleeve to move upward; this will generate an upward pulling force on the threaded sleeve and the upper clamp connected to the threaded sleeve; by adjusting the power-on time and current of the motor, the rotation of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp, thus achieving the control of the tensile force of the sample. It should be noted that the number of rotations and / or torque corresponding to the motor can be calculated according to the tensile force value required for the experiment, and the upward pulling force generated by the upper clamp can be adjusted to the tensile force value required for the experiment by controlling the motor, thereby meeting different tensile requirements.

[0072] In summary, the present invention provides a mechanical property testing environment box, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and includes a first box body, a second box body, a lower base plate, a motor, a control mechanism and a stretching mechanism; the stretching mechanism includes an upper clamp, a lower clamp, a threaded sleeve, a screw and a support frame, wherein the support frame includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with a slide groove on the inner wall of the first box body; the other end of each support arm is fixedly connected to the threaded sleeve; thereby realizing a sliding connection between the support frame and the second box body; the upper clamp for fixing the upper end of the sample is fixedly connected to the threaded sleeve; the upper clamp for fixing the lower end of the sample is fixedly connected to the threaded sleeve; The lower clamp at the end is fixedly connected to the lower base plate; the lower part of the screw is a connecting part for threaded connection with the threaded sleeve; the upper end of the screw is fixedly connected to the motor; the top of the first box body and the second box body are detachably sealed; the second box body and the lower base plate are detachably sealed; the motor is arranged in the first box body; the stretching mechanism is arranged in the second box body; thereby, the entire stretching mechanism can be sealed in the environmental chamber; the connecting line of the control mechanism passes through the first box body and is connected to the motor circuit; by energizing the motor, the motor generates torque and drives the screw to rotate upward, so that the threaded sleeve also moves upward, thereby also driving the upper clamp to move upward to achieve stretching of the sample.

[0073] The working principle of the mechanical property testing environment box of the present invention is that after the motor is connected to the power supply, the motor starts to rotate and generate torque, at which time the screw starts to rotate upward, thereby driving the threaded sleeve to move upward; this will generate an upward pulling force on the threaded sleeve and the upper clamp connected to the threaded sleeve; by adjusting the power-on time and current of the motor, the rotation action of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp, thereby realizing the control of the tensile force of the sample.

[0074] 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.

[0075] Embodiment 2

[0076] On the basis of the first embodiment, the control mechanism in the embodiment of the present invention may further include a pressure sensing module and a mechanical property testing module;

[0077] Nitrogen and hydrogen (or one of the gases) are filled into the second box 7 through the filling port of the second box 7, and the pressure value in the second box 7 is transmitted through the pressure sensing module; if the pressure value in the second box 7 exceeds the preset pressure parameter value, the air can be exhausted and the pressure can be reduced through the air outlet of the second box 7, so that the ambient pressure in the second box 7 is reduced to the preset pressure parameter value.

[0078] The mechanical properties test module can be used to obtain the actual tensile force of the sample under different torques of the motor, and combined with the tensile displacement of the sample under the tensile force, the mechanical properties parameter value of the sample material in the gaseous environment can be obtained. The tensile displacement of the sample is obtained by a displacement measuring device installed on the sample, such as an extensometer.

[0079] The specific implementation of the present invention is described below in conjunction with a specific application scenario. Figure 1 , in this specific application scenario, the sample, the upper clamp 9 and the lower clamp 12 are assembled into an integrated structure; and the integrated structure is fixedly connected to the threaded sleeve 5; the threaded sleeve 5 with the integrated structure is assembled into the interior of the second box body 7 along the slide groove 8; and it is screwed on the screw rod 4 until the lower clamp 12 is flush with the bottom end surface of the second box body 7; the lower base plate 16 is aligned with the sealing ring and the bolt hole and installed to the bottom of the second box body 7; the end of the screw rod 4 connected to the outlet of the motor 1 is adjusted so that the lower clamp 12 is flush with the lower base plate 16; and the second box body 7 and the lower base plate 16 are fixed in a symmetrical installation order; the lower clamp 12 and the lower base plate 16 are fixedly connected to the motor 1 and the upper end of the screw rod 4 is fixed; the first box body is aligned with the sealing ring and the bolt hole and the first box body and the second box body 7 are fixed in a symmetrical installation order.

[0080] According to the preset gas type of the preset environmental box, nitrogen and hydrogen are filled into the second box 7 in sequence (it can also be one of the gases according to the test requirements), and the pressure of the second box 7 is detected. When the environmental pressure in the second box 7 reaches the preset pressure parameter value, the second box 7 is stabilized; after the pressure in the second box 7 is stabilized, the power switch of the motor is turned on to energize the motor 1, and the motor starts to rotate and generate torque, so that the screw 4 starts to rotate upward, thereby driving the threaded sleeve 5 to move upward; this will generate an upward pulling force on the threaded sleeve 5 and the upper clamp 9 connected to the threaded sleeve; by adjusting the power-on time and current of the motor 1, the rotation action of the screw 4 (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp 9, thereby achieving the control of the tensile force of the sample. It should be noted that the torque corresponding to the motor can be calculated according to the tensile force value required for the experiment, and the upward pulling force generated by the upper clamp can be adjusted to the tensile force value required for the experiment by controlling the motor, thereby meeting different tensile requirements.

[0081] Embodiment 3

[0082] 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:

[0083] S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box.

[0084] In the embodiment of the present invention, the preset gas type includes: nitrogen and / or hydrogen. In a specific application scenario, nitrogen and hydrogen can be filled into the environmental chamber, and any one of the gases can be filled according to the test requirements.

[0085] S12, calculating the number of rotations and / or torque of the motor according to the pulling force value required by the experiment;

[0086] S13. When the ambient pressure in the environmental box reaches the pressure parameter value, the number of rotations and / or the torque of the motor are controlled to adjust the upward pulling force of the upper clamp to the pulling force value required for the experiment.

[0087] In the implementation of the present invention, when the ambient pressure in the second box 7 reaches the pressure parameter value, it also includes: stabilizing the voltage of the second box 7. That is, when the ambient pressure of the second box 7 reaches the preset pressure parameter value, the voltage of the second box 7 is stabilized; after the pressure of the second box 7 is stabilized, the power switch of the motor is turned on to energize the motor 1, the motor 1 generates torque, the screw 4 starts to rotate upward, and then drives the threaded sleeve 5 to move upward; this will generate an upward pulling force on the threaded sleeve 5 and the upper clamp 9 connected to the threaded sleeve; by adjusting the power-on time and current of the motor 1, the rotation action of the screw 4 (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp 9, thereby achieving the control of the tensile force of the sample.

[0088] Furthermore, in the embodiment of the present invention, it also includes:

[0089] S14. 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.

[0090] In the embodiment of the present invention, the actual tensile force value of the sample under different torques of the motor can be obtained by the mechanical property testing module, and then the tensile displacement of the sample under the tensile force can be combined to obtain the mechanical property parameter value of the material of the sample in the gaseous environment.

[0091] In summary, the present invention provides a mechanical property testing environment box, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and includes a first box body, a second box body, a lower base plate, a motor, a control mechanism and a stretching mechanism; the stretching mechanism includes an upper clamp, a lower clamp, a threaded sleeve, a screw and a support frame, wherein the support frame includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with a slide groove on the inner wall of the first box body; the other end of each support arm is fixedly connected to the threaded sleeve; thereby realizing a sliding connection between the support frame and the second box body; the upper clamp for fixing the upper end of the sample is fixedly connected to the threaded sleeve; the upper clamp for fixing the lower end of the sample is fixedly connected to the threaded sleeve; The lower clamp at the end is fixedly connected to the lower base plate; the lower part of the screw is a connecting part for threaded connection with the threaded sleeve; the upper end of the screw is fixedly connected to the motor; the top of the first box body and the second box body are detachably sealed; the second box body and the lower base plate are detachably sealed; the motor is arranged in the first box body; the stretching mechanism is arranged in the second box body; thereby, the entire stretching mechanism can be sealed in the environmental chamber; the connecting line of the control mechanism passes through the first box body and is connected to the motor circuit; after the motor is energized, the motor generates torque and drives the screw to rotate upward, so that the threaded sleeve also moves upward, thereby also driving the upper clamp to move upward to achieve stretching of the sample.

[0092] The working principle of the mechanical property testing environment box of the present invention is that after the motor is connected to the power supply, the motor starts to rotate and generate torque, at which time the screw starts to rotate upward, thereby driving the threaded sleeve to move upward; this will generate an upward pulling force on the threaded sleeve and the upper clamp connected to the threaded sleeve; by adjusting the power-on time and current of the motor, the rotation action of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the upward pulling force of the upper clamp, thereby realizing the control of the tensile force of the sample.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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 first box body, a second box body, a lower bottom plate, a motor, a control mechanism and a stretching mechanism; The top of the first box body and the top of the second box body are detachably connected in a sealed manner; the second box body and the lower bottom plate are detachably connected in a sealed manner; The motor is disposed in the first housing; the stretching mechanism is disposed in the second housing; The stretching mechanism comprises an upper clamp, a lower clamp, a threaded sleeve, a screw and a support frame, wherein: The upper fixture for fixing the upper end of the sample is fixedly connected to the threaded sleeve; the lower fixture for fixing the lower end of the sample is fixedly connected to the lower base plate; the lower part of the screw is a connecting part for threaded connection with the threaded sleeve; the upper end of the screw is fixedly connected to the motor; The support frame includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with the slide groove of the inner wall of the second box body; the other end of each support arm is fixedly connected to the threaded sleeve; The connecting wire of the control mechanism passes through the box wall of the first box body and is connected to the motor circuit.

2. The mechanical properties testing environment chamber according to claim 1, characterized in that: The connection structure of the first box body, the second box body and the lower base plate includes: A first fastening bolt for tightly connecting the first box body and the second box body; A second fastening bolt used for sealingly connecting the second box body and the lower base plate; Sealing rings are respectively arranged in the groove of the outer top wall of the second box body and in the groove of the lower bottom plate.

3. The mechanical properties testing environment chamber according to claim 2, characterized in that: The screw rod passes through a sealing bearing arranged on the top of the second box body and is threadedly connected with the threaded sleeve.

4. The mechanical properties testing environment chamber according to claim 3, characterized in that: The threaded sleeve is provided with a plurality of supporting arms in the circumferential direction.

5. The mechanical properties testing environment chamber according to claim 4, characterized in that: The support frame comprises: The support frame is in a cross shape or a cross shape.

6. The mechanical properties testing environment chamber according to claim 1, characterized in that: The motor is disposed in the first housing and includes: The motor is connected to the control mechanism circuit via a lead hole provided in the first box body.

7. The mechanical properties testing environment box according to claim 1, characterized in that: Also includes: A pressure sensing module and / or a mechanical property testing module is arranged in the second housing; the pressure sensing module and / or the mechanical property testing module is connected to the control mechanism circuit.

8. The mechanical properties testing environment box according to claim 7, characterized in that: Also includes: The second box body or the bottom plate is provided with lead holes for connecting the pressure sensing module and / or the mechanical property testing module.

9. The mechanical properties testing environment chamber according to claim 8, characterized in that: The support arm comprises: The supporting arm is a bar-shaped rod.

10. A mechanical property testing method, applicable to the mechanical property testing environment box as claimed in any one of claims 1 to 9, characterized in that: Includes steps: S11, presetting the environmental parameters of the test chamber; the environmental parameters include the preset gas type and the corresponding pressure parameter value in the environmental chamber; S12, calculating the number of revolutions and / or torque corresponding to the motor according to the pulling force value required by the experiment; S13. When the ambient pressure in the environmental box reaches the pressure parameter value, the number of revolutions and / or torque of the motor is controlled to adjust the upward pulling force of the upper clamp to the pulling force value required for the experiment.

11. The mechanical property testing method according to claim 10, characterized in that: Also includes: S14. 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.

12. The mechanical property testing method according to claim 11, characterized in that: The preset gas types include: Nitrogen and / or hydrogen.

13. The mechanical property testing method according to claim 12, characterized in that: When the environmental pressure in the environmental box reaches the pressure parameter value, the method further includes: Stabilize the environmental chamber.

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