Mechanical property testing environment box and testing method

Abstract

The invention discloses a mechanical property testing environment box and a testing method, and the mechanical property testing environment box comprises an upper box body cover, a box body, a lower bottom plate, a control mechanism and a stretching mechanism; the upper box body cover, the box body and the lower bottom plate are detachably and hermetically connected; the stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a threaded sleeve, a screw rod, a rotor mechanism and a stator mechanism; the upper clamp is fixedly connected with the upper box body cover; the lower clamp is fixedly connected with the upper end of the threaded sleeve; the upper part of the screw rod is a connecting part connected with the threaded sleeve; the lower end of the screw rod is pivoted with the lower bottom plate; a rotor mechanism is arranged at the lower part of the screw rod; the rotor mechanism comprises a coil winding rod fixedly connected with the screw rod; a stator mechanism comprising a strong magnet is arranged at a position, corresponding to the rotor mechanism, of the lower part of the inner wall of the box body; a coil of the coil winding rod is in circuit connection with the control mechanism through a lead hole of the lower bottom plate; 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, and in particular to a mechanical property testing environment box and a testing method. Background Art

[0002] Hydrogen energy has the advantages of high conversion efficiency, clean combustion products and diversified uses. It is a renewable secondary energy source. The role of hydrogen energy 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. Some countries and regions have also 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] Currently, hydrogen storage and transportation are mainly carried out in a high-pressure gaseous state. Studying the mechanical properties of materials under hydrogen pressure environments 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.

[0004] Due to the small mass of hydrogen, it is easy to leak and spread, has low ignition energy and a wide explosion range. Currently, most tests are conducted in environmental chambers to simulate high-pressure hydrogen environments. This performance test method has strict requirements on the sealing, safety and reliability of the environmental chamber. 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 inventor has found through research that the environmental chamber of 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 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 properties of materials in a gaseous hydrogen pressure environment, and comprises an upper box cover, a box body, a lower bottom plate, a control mechanism and a stretching mechanism;

[0010] The upper box cover, the box body and the lower base plate are detachably and tightly connected;

[0011] The stretching mechanism comprises an upper fixture, a lower fixture, a support frame, a threaded sleeve, a screw, a rotor mechanism and a stator mechanism, wherein:

[0012] The upper fixture for fixing the upper end of the sample is fixedly connected to the upper box cover; the lower fixture for fixing the lower end of the sample is fixedly connected to the upper end of the threaded sleeve;

[0013] The upper part of the screw is a connecting part for threaded connection with the threaded sleeve; the lower end of the screw is pivotally connected to the lower bottom plate; a rotor mechanism is provided at the lower part of the screw; the rotor mechanism includes a coil winding rod fixedly connected to the screw; a stator mechanism including a strong magnet is provided at a position corresponding to the rotor mechanism at the lower part of the inner wall of the box; the coil of the coil winding rod is connected to the control mechanism circuit through a lead hole provided on the lower bottom plate;

[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 sliding groove of the inner wall of the box body; the other end of each support arm is fixedly connected to the threaded sleeve.

[0015] Preferably, in an embodiment of the present invention, the connection structure of the upper box cover, the box body and the lower base plate includes:

[0016] A first fastening bolt used for sealingly connecting the upper box cover and the box body;

[0017] A second fastening bolt used for sealingly connecting the box body and the lower base plate;

[0018] Sealing rings are respectively arranged in the groove of the upper box cover and the groove of the lower bottom plate.

[0019] Preferably, in an embodiment of the present invention, a plurality of support arms are provided circumferentially of the threaded sleeve.

[0020] Preferably, in an embodiment of the present invention, the support frame comprises:

[0021] The support frame is in a cross shape or a cross shape.

[0022] Preferably, in an embodiment of the present invention, the stator mechanism includes three groups of stators; and the rotor mechanism includes three groups of rotors.

[0023] Preferably, in an embodiment of the present invention, the rotor mechanism includes a coil winding rod fixedly connected to the screw rod, including:

[0024] The lower part of the screw is circumferentially fixedly connected to the three groups of coil winding rods, and is respectively arranged at positions corresponding to the three groups of stators.

[0025] Preferably, in an embodiment of the present invention, the structure of the strong magnet and the coil winding rod includes:

[0026] The ends of the coil winding rod close to the strong magnet are both arranged at a distance that enables the coil winding rod to rotate freely.

[0027] Preferably, in an embodiment of the present invention, the control mechanism comprises:

[0028] Coil circuit control module, pressure sensing module and mechanical properties testing module.

[0029] Preferably, in an embodiment of the present invention, the lower end of the screw rod is pivotally connected to the lower base plate, comprising:

[0030] The lower end of the screw rod is pivotally connected to the lower base plate through a bearing.

[0031] Preferably, in an embodiment of the present invention, the support arm comprises:

[0032] The supporting arm is a bar-shaped rod.

[0033] 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:

[0034] 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;

[0035] S12, calculating the current value required by the coil according to the pulling force value required by the experiment;

[0036] S13. When the ambient pressure in the environmental chamber reaches the pressure parameter value, the current value of the coil is controlled by the control mechanism to adjust the downward pulling force generated by the rotation of the screw along the threaded sleeve to the pulling force value required for the experiment.

[0037] Preferably, in the embodiment of the present invention, it also includes:

[0038] 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.

[0039] Preferably, in an embodiment of the present invention, the preset gas types include:

[0040] Nitrogen and / or hydrogen.

[0041] 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:

[0042] Stabilize the environmental chamber.

[0043] On the other hand, the present invention also provides an operating method of a mechanical properties test environment box, which is applicable to the above-mentioned mechanical properties test environment box. The operating method of the mechanical properties test environment box is used before the above-mentioned mechanical properties test method, and comprises the following steps:

[0044] S21, assembling the threaded sleeve with the support frame into the box along the slide groove, assembling the sample on the upper fixture and the lower fixture, and assembling the integrated structure with the sample, the upper fixture and the lower fixture on the threaded sleeve through fixing bolts, and covering the upper box cover;

[0045] S22. Adjust the position of the threaded sleeve from the lower end of the box body so that the upper fixture fits the upper box body cover; fix the upper box body cover and the box body in a symmetrical installation sequence;

[0046] S23, rotating the screw rod with the coil winding rod and the bottom of which is equipped with a bearing and a bearing cover from the bottom of the box body upward along the threaded sleeve; and making it flush with the cross section of the lower opening of the box body;

[0047] S24. Place the assembled box on the lower base plate in accordance with the alignment of the sealing ring and the bolt holes, and fix the box and the lower base plate in a symmetrical installation sequence.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 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 an upper box cover, a box body, a lower bottom plate, a control mechanism and a stretching mechanism; the stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a threaded sleeve, a screw, a rotor mechanism and a stator mechanism, 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 an inner side wall of the 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 box body; the upper box cover, the box body and the lower bottom plate are detachably and hermetically connected; the upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; the clamp for fixing The lower clamp at the lower end of the sample is fixedly connected to the upper end of the threaded sleeve; the upper part of the screw is a connecting part for threaded connection with the threaded sleeve; the lower end of the screw is pivotally connected to the lower bottom plate; thereby, the entire stretching mechanism can be enclosed in the environmental box; a rotor mechanism is provided at the lower part of the screw; the rotor mechanism includes a coil winding rod fixedly connected to the screw; a stator mechanism including a strong magnet is provided at a position corresponding to the rotor mechanism at the lower part of the inner wall of the box; the coil of the coil winding rod is connected to the control mechanism circuit through a lead hole provided on the lower bottom plate; the coil is energized through the coil circuit control module to generate an electromagnetic field, and under the action of the strong magnet, the screw rotates helically along the threaded sleeve, and the sample is stretched by rotating the threaded sleeve downward.

[0050] The working principle of the mechanical property testing environment box of the present invention is that after the control mechanism connects the current to the coil, the rotor mechanism will rotate under the magnetic force of the stator mechanism, thereby driving the screw to rotate in the threaded sleeve; this will generate a downward pulling force on the threaded sleeve and the lower clamp connected to the threaded sleeve; by adjusting the power-on time and current of the coil, the rotation action of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the downward pulling force on the lower clamp, thereby realizing the control of the tensile force of the sample.

[0051] 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.

[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 top view schematic diagram of the screw rotating structure in the present invention;

[0056] Figure 3 It is a step diagram of the mechanical property testing method of the present invention;

[0057] Figure 4 It is a step diagram of the operating method of the mechanical property testing environment box in the present invention. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Embodiment 1

[0062] 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 an upper box cover 1, a box body 2, a lower bottom plate 19, a control mechanism 22 and a stretching mechanism;

[0063] The upper box cover 1, the box body 2 and the lower bottom plate 19 are detachably and tightly connected;

[0064] The stretching mechanism includes an upper clamp 4, a lower clamp 6, a threaded sleeve 7, a support frame 8, a screw 9, a coil winding rod 10, a bearing 14, and a strong magnet 16, wherein:

[0065] The upper fixture 4 for fixing the upper end of the sample is fixedly connected to the upper box cover 1; the lower fixture 6 for fixing the lower end of the sample is fixedly connected to the upper end of the threaded sleeve 7;

[0066] The upper part of the screw rod 9 is a connection part for threaded connection with the threaded sleeve 7; the lower end of the screw rod 9 is pivotally connected to the lower bottom plate 19; a rotor mechanism is provided at the lower part of the screw rod 9; the rotor mechanism includes a coil winding rod 10 fixedly connected to the screw rod 9; a stator mechanism including a strong magnet 16 is provided at a position corresponding to the rotor mechanism at the lower part of the inner wall of the box body 2; the coil of the coil winding rod 10 is connected to the control mechanism 22 circuit through a lead hole provided on the lower bottom plate 19;

[0067] The support frame 8 includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with the slide groove 13 on the inner wall of the box body 2; the other end of each support arm is fixedly connected to the threaded sleeve 7.

[0068] 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.

[0069] Based on this, in an embodiment of the present invention, the entire stretching mechanism is placed in a closed environmental box, the amount of current connected to the coil is adjusted by a control mechanism, and an electromagnetic field is generated. Under the action of strong magnets around the lower part of the box, the rotation speed of the coil winding rod is controlled, thereby controlling the rotation and torque of the screw along the threaded sleeve, and further controlling the magnitude of the stretching force of the threaded sleeve rotating downward; thereby achieving control over the stretching force of the sample; since in an embodiment of the present invention the entire stretching mechanism is completely placed in a closed environmental box, it is no longer necessary to set a dynamic sealing structure on the sealed box to transmit force to the sample, thereby effectively avoiding the problem of gas leakage in the environmental box 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.

[0070] Furthermore, in an embodiment of the present invention, the upper box cover 1 and the box body 2 are fixedly connected by a first fastening bolt 3, and the box body 2 and the lower base plate 19 are fixedly connected by a second fastening bolt 17; the upper clamp 4 is fixedly connected to the upper box cover 1 by a bolt 11, and the lower clamp 6 is fixedly connected to the upper end of the threaded sleeve 7 by a bolt 12, and the upper part of the screw rod 9 is a connecting part for threaded connection with the threaded sleeve 7; the lower end of the screw rod 9 is pivotally connected to the lower base plate 19 by a bearing 14; in addition, sealing rings are respectively provided in the grooves of the upper box cover 1 and the lower base plate 19, and the connecting surfaces of the upper box cover 1 and the box body 2, as well as the connecting surfaces of the box body 2 and the lower base plate 19 are respectively sealed by the sealing rings; thereby, the sealing effect of the entire environmental chamber is better.

[0071] In the embodiment of the present invention, the support frame 8 includes more than two strip-shaped support arms, each of which is slidably connected to the slide groove 13 of the inner wall of the box body 2 through a connecting portion at one end; the other end of each of the support arms is fixedly connected to the threaded sleeve 7. The support frame 8 can be set as two support arms, each of which is slidably connected to the slide groove 13 of the inner wall of the box body 2 through a connecting portion at one end, and the other end of each support arm is arranged on symmetrical sides of the threaded sleeve 7; in this way, the balance and stability of the threaded sleeve 7 and the lower clamp 6 can be ensured.

[0072] In order to make the lower fixture 6 stably fix the lower end of the sample, in the embodiment of the present invention, a plurality of support arms are provided in the circumference of the threaded sleeve, and the plurality of support arms can be provided as a cross-shaped support frame or a cross-shaped support frame, so that the stability of the lower fixture 6 and the threaded sleeve 7 is better. In addition, the connecting portion at one end of each support arm and the slide groove 13 can be provided as an interference fit, so that the stability of the lower fixture 6 and the threaded sleeve 7 is stronger.

[0073] In addition, the support frame 8 can also be arranged on both sides of the threaded sleeve 7, and it can be four parallel support arms. Each support arm is slidably connected to the slide groove 13 on the inner wall of the box body 2 through a connecting part at one end, and the other end of each support arm is fixedly connected to the threaded sleeve 7, which can ensure the balance and stability of the threaded sleeve 7 and the lower clamp 6.

[0074] In addition, according to the shape of the environmental chamber, the support frame 8 can also be set as three support arms, and each support arm is slidably connected to the sliding groove of the inner wall of the box body 2 through a connecting part at one end; the other end of each support arm is fixedly connected to the threaded sleeve 7 to form a Y shape, which can also ensure the balance and stability of the threaded sleeve 7 and the lower clamp 6.

[0075] In the embodiment of the present invention, the slide groove 13 can be set as a groove track, and the support frame 8 can be adjusted to move up and down by the groove track, thereby adjusting the position of the lower clamp 6 to achieve precise control of the stretching direction of the sample.

[0076] Further, in an embodiment of the present invention, if Figure 2 As shown, the stator mechanism includes three groups of stators; the rotor mechanism includes three groups of rotors; the three groups of stators include three groups of fixed strong magnets, which are evenly arranged at the lower part of the inner wall of the box body 2; the three groups of rotors include three groups of coil winding rods 10 with coils, and the coil winding rods 10 with coils are arranged along the circumference of the lower part of the screw 9 and correspond to the positions of the three groups of fixed strong magnets, so that a strong electromagnetic field can be generated after the coils are energized; the coil winding rods 10 are set at a certain distance from the ends close to the strong magnets 16, so that the three groups of coil winding rods can rotate freely.

[0077] Furthermore, in an embodiment of the present invention, the lower end of the screw rod 9 is pivotally connected to the lower base plate 19 through a bearing 14; a bearing cover 15 is provided on the outside of the bearing, and the bearing cover 15 is fixedly connected to the lower base plate 19 through a bolt 20; by supporting the rotation of the screw rod 9 through the bearing 14, the friction coefficient during the rotation process can be reduced, and the rotation accuracy of the screw rod 9 can also be ensured.

[0078] Furthermore, in the embodiment of the present invention, the control mechanism 22 includes: a coil circuit control module, a pressure sensing module and a mechanical property testing module; the bottom wall of the lower bottom plate 19 is provided with lead holes corresponding to the coil circuit control module, the pressure sensing module and the mechanical property testing module; the coil circuit control module generates an electromagnetic field after the coil on the coil winding rod 10 is energized, and under the action of the strong magnets around the lower part of the box 2, the coil winding rod 10 rotates, further driving the screw 9 to rotate along the threaded sleeve 7, and then the threaded sleeve 7 rotates downward to achieve the stretching of the sample. It should be noted that the current value required by the coil can be calculated according to the tension value required for the experiment, and the current value of the coil energized can be controlled by the coil circuit control module, and the downward pulling force generated by the screw rotating along the threaded sleeve is adjusted to the tension value required for the experiment, thereby meeting different stretching requirements.

[0079] In addition, nitrogen and hydrogen (or one of the gases) are filled into the environmental box through the inflation port of the box body 2, 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 air outlet of the box body 2, so that the ambient pressure in the environmental box is reduced to the preset pressure parameter value.

[0080] 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.

[0081] 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 threaded sleeve 7 with the support frame 8 is assembled into the interior of the box along the slide groove 13, the integrated structure with the sample, the upper clamp 4 and the lower clamp 6 is assembled on the threaded sleeve 7 through the fixing bolts 12, and the upper box cover 1 is covered. The position of the threaded sleeve 7 is observed and adjusted from the lower end of the box 2 so that the upper clamp 4 fits the upper box cover 1, and all bolts 11 are tightened in a symmetrical installation sequence, and all first fastening bolts 3 are tightened in the same way; the coil winding rod 10 with the coil and the screw with the bearing 14 and the bearing cover 15 at the bottom are rotated and moved upward along the threaded sleeve 7 from the bottom of the box 2 (to avoid changes in the position of the sample, the threaded sleeve 7 can be held by hand during installation to keep it stationary), and the assembled box is placed on the lower base plate 19 with the sealing ring and the bolt holes aligned, and all bolts 20 are tightened in a symmetrical installation sequence, and all lower base plate second fastening bolts 17 are tightened in the same way.

[0082] According to the preset gas type of the preset environmental box, nitrogen and hydrogen are filled into the environmental box in sequence (it can also be one of the gases according to the test requirements), and the environmental box is pressure tested. When the environmental pressure in the environmental box reaches the preset pressure parameter value, the environmental box is stabilized; after the pressure of the environmental box is stabilized, the coil on the coil winding rod 10 is energized to generate an electromagnetic field. Under the action of the fixed strong magnets 16 around the lower part of the box body 2, the coil winding rod 10 rotates, further driving the screw 9 to rotate along the threaded sleeve 7, and then the threaded sleeve 7 is rotated downward to achieve the stretching of the sample. It should be noted that the current value required by the coil can be calculated according to the tension value required for the experiment, and the current value of the coil power supply can be controlled by the coil circuit control module, so that the downward tension generated by the rotation of the screw 9 along the threaded sleeve 7 is adjusted to the tension value required for the experiment, thereby meeting different stretching requirements.

[0083] In summary, 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 includes an upper box cover, a box body, a lower bottom plate, a control mechanism and a stretching mechanism; the stretching mechanism includes an upper clamp, a lower clamp, a support frame, a threaded sleeve, a screw, a rotor mechanism and a stator mechanism, 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 an inner side wall of the 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 box body; the upper box cover, the box body and the lower bottom plate are detachably and airtightly connected; the upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; the clamp for fixing the sample The lower clamp at the lower end of the fixed sample is fixedly connected to the upper end of the threaded sleeve; the upper part of the screw is a connecting part for threaded connection with the threaded sleeve; the lower end of the screw is pivotally connected to the lower bottom plate; thereby, the entire stretching mechanism can be enclosed in the environmental box; a rotor mechanism is provided at the lower part of the screw; the rotor mechanism includes a coil winding rod fixedly connected to the screw; a stator mechanism including a strong magnet is provided at a position corresponding to the rotor mechanism at the lower part of the inner wall of the box; the coil of the coil winding rod is connected to the control mechanism circuit through a lead hole provided on the lower bottom plate; the coil is energized through the coil circuit control module to generate an electromagnetic field, and under the action of the strong magnet, the screw rotates helically along the threaded sleeve, and the sample is stretched by rotating the threaded sleeve downward.

[0084] The working principle of the mechanical properties testing environment box of the embodiment of the present invention is that after the control mechanism connects the current to the coil, the rotor mechanism will rotate under the magnetic force of the stator mechanism, thereby driving the screw to rotate in the threaded sleeve; this will generate a downward pulling force on the threaded sleeve and the lower clamp connected to the threaded sleeve; by adjusting the power-on time and current of the coil, the rotation action of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the downward pulling force on the lower clamp, thereby realizing the control of the tensile force of the sample.

[0085] 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.

[0086] Embodiment 2

[0087] 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 3 As shown, the specific steps include:

[0088] S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box.

[0089] 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.

[0090] S12, calculating the current value required by the coil according to the pulling force value required by the experiment;

[0091] S13. When the ambient pressure in the environmental chamber reaches the pressure parameter value, the current value of the coil is controlled by the control mechanism to adjust the downward pulling force generated by the rotation of the screw along the threaded sleeve to the pulling force value required for the experiment.

[0092] In the implementation of the present invention, when the environmental pressure in the environmental box reaches the pressure parameter value, it also includes: stabilizing the pressure of the environmental box. That is, when the environmental pressure in the environmental box reaches the preset pressure parameter value, the environmental box is stabilized; after the pressure of the environmental box is stabilized, the coil on the coil winding rod 10 is energized to generate an electromagnetic field, and under the action of the strong magnets around the lower part of the box body 2, the coil winding rod 10 rotates, further driving the screw 9 to rotate along the threaded sleeve 7, and then the threaded sleeve 7 rotates downward to achieve the stretching of the sample.

[0093] Furthermore, in the embodiment of the present invention, it also includes:

[0094] 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.

[0095] In the embodiment of the present invention, the actual tensile force value of the sample under different currents 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.

[0096] In summary, 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 includes an upper box cover, a box body, a lower bottom plate, a control mechanism and a stretching mechanism; the stretching mechanism includes an upper clamp, a lower clamp, a support frame, a threaded sleeve, a screw, a rotor mechanism and a stator mechanism, 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 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 box body; the upper box cover, the box body and the lower bottom plate are detachably and hermetically connected; the upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; the clamp for fixing The lower clamp at the lower end of the sample is fixedly connected to the upper end of the threaded sleeve; the upper part of the screw is a connecting part for threaded connection with the threaded sleeve; the lower end of the screw is pivotally connected to the lower bottom plate; thereby, the entire stretching mechanism can be enclosed in the environmental box; a rotor mechanism is provided at the lower part of the screw; the rotor mechanism includes a coil winding rod fixedly connected to the screw; a stator mechanism including a strong magnet is provided at a position corresponding to the rotor mechanism at the lower part of the inner wall of the box; the coil of the coil winding rod is connected to the control mechanism circuit through a lead hole provided on the lower bottom plate; the coil is energized through the coil circuit control module to generate an electromagnetic field, and under the action of the strong magnet, the screw rotates helically along the threaded sleeve, and the sample is stretched by rotating the threaded sleeve downward.

[0097] The working principle of the mechanical property testing environment box of the present invention is that after the control mechanism connects the current to the coil, the rotor mechanism will rotate under the magnetic force of the stator mechanism, thereby driving the screw to rotate in the threaded sleeve; this will generate a downward pulling force on the threaded sleeve and the lower clamp connected to the threaded sleeve; by adjusting the power-on time and current of the coil, the rotation action of the screw (including the number of rotations and torque) can be controlled, thereby achieving the purpose of adjusting the downward pulling force on the lower clamp, thereby realizing the control of the tensile force of the sample; since in the embodiment of the present invention, it is no longer necessary to set a dynamic sealing structure on the sealing box body to transmit force to the sample, the problem of gas leakage in the environmental box due to dynamic sealing failure in the environmental box 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, and further reducing the risk of the test.

[0098] Embodiment 3

[0099] The embodiment of the present invention is adapted to the mechanical properties test environment box in the first embodiment. The embodiment of the present invention also provides an operating method of the mechanical properties test environment box. The operating method of the mechanical properties test environment box is used before the mechanical properties test method in the second embodiment. Figure 4 As shown, the specific steps include:

[0100] S21, assembling the threaded sleeve with the support frame into the box along the slide groove, assembling the sample on the upper fixture and the lower fixture, and assembling the integrated structure with the sample, the upper fixture and the lower fixture on the threaded sleeve through fixing bolts, and covering the upper box cover;

[0101] S22. Adjust the position of the threaded sleeve from the lower end of the box body so that the upper fixture fits the upper box body cover; fix the upper box body cover and the box body in a symmetrical installation sequence;

[0102] S23, rotating the screw rod with the coil winding rod and the bottom of which is equipped with a bearing and a bearing cover from the bottom of the box body upward along the threaded sleeve; and making it flush with the cross section of the lower opening of the box body;

[0103] S24. Place the assembled box on the lower base plate in accordance with the alignment of the sealing ring and the bolt holes, and fix the box and the lower base plate in a symmetrical installation order.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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 an upper box cover, a box body, a lower bottom plate, a control mechanism and a stretching mechanism; The upper box cover, the box body and the lower base plate are detachably and tightly connected; The stretching mechanism comprises an upper fixture, a lower fixture, a support frame, a threaded sleeve, a screw, a rotor mechanism and a stator mechanism, wherein: The upper fixture for fixing the upper end of the sample is fixedly connected to the upper box cover; the lower fixture for fixing the lower end of the sample is fixedly connected to the upper end of the threaded sleeve; The upper part of the screw is a connecting part for threaded connection with the threaded sleeve; the lower end of the screw is pivotally connected to the lower bottom plate; a rotor mechanism is provided at the lower part of the screw; the rotor mechanism includes a coil winding rod fixedly connected to the screw; a stator mechanism including a strong magnet is provided at a position corresponding to the rotor mechanism at the lower part of the inner wall of the box; the coil of the coil winding rod is connected to the control mechanism circuit through a lead hole provided on the lower bottom plate; The support frame includes more than two support arms; one end of each support arm includes a connecting portion for sliding connection with the sliding groove of the inner wall of the box body; the other end of each support arm is fixedly connected to the threaded sleeve.

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

3. The mechanical properties testing environment chamber according to claim 2, characterized in that: The threaded sleeve is provided with a plurality of supporting arms in the circumferential direction.

4. The mechanical properties testing environment chamber according to claim 3, characterized in that: The support frame comprises: The support frame is in a cross shape or a cross shape.

5. The mechanical properties testing environment chamber according to claim 4, characterized in that: The stator mechanism includes three groups of stators; the rotor mechanism includes three groups of rotors.

6. The mechanical properties testing environment chamber according to claim 5, characterized in that: The rotor mechanism includes a coil winding rod fixedly connected to the screw rod, including: The lower part of the screw is circumferentially fixedly connected to the three groups of coil winding rods, and is respectively arranged at positions corresponding to the three groups of stators.

7. The mechanical properties testing environment chamber according to claim 6, characterized in that: The structure of the strong magnet and the coil winding rod includes: The ends of the coil winding rod close to the strong magnet are both arranged at a distance that enables the coil winding rod to rotate freely.

8. The mechanical properties testing environment chamber according to claim 1, characterized in that: The control mechanism comprises: Coil circuit control module, pressure sensing module and mechanical properties testing module.

9. The mechanical properties testing environment chamber according to claim 1, characterized in that: The lower end of the screw rod is pivotally connected to the lower bottom plate, comprising: The lower end of the screw rod is pivotally connected to the lower base plate through a bearing.

10. The mechanical properties testing environment chamber according to claim 1, characterized in that: The support arm comprises: The supporting arm is a bar-shaped rod.

11. A mechanical property testing method, applicable to the mechanical property testing environment box as claimed in any one of claims 1 to 10, 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 current value required by the coil according to the pulling force value required by the experiment; S13. When the ambient pressure in the environmental chamber reaches the pressure parameter value, the current value of the coil is controlled by the control mechanism to adjust the downward pulling force generated by the rotation of the screw along the threaded sleeve to the pulling force value required for the experiment.

12. The mechanical property testing method according to claim 11, 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.

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

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

15. A method for operating a mechanical properties test environment box, applicable to the mechanical properties test environment box as claimed in any one of claims 1 to 10, the method for operating the mechanical properties test environment box being used before the mechanical properties test method as claimed in claim 11, characterized in that: Includes steps: S21, assembling the threaded sleeve with the support frame into the box along the slide groove, assembling the sample on the upper fixture and the lower fixture, and assembling the integrated structure with the sample, the upper fixture and the lower fixture on the threaded sleeve through fixing bolts, and covering the upper box cover; S22. Adjust the position of the threaded sleeve from the lower end of the box body so that the upper fixture fits the upper box body cover; fix the upper box body cover and the box body in a symmetrical installation sequence; S23, rotating the screw rod with the coil winding rod and the bottom of which is equipped with a bearing and a bearing cover from the bottom of the box body upward along the threaded sleeve; and making it flush with the cross section of the lower opening of the box body; S24. Place the assembled box on the lower base plate in accordance with the alignment of the sealing ring and the bolt holes, and fix the box and the lower base plate in a symmetrical installation order.

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