Mechanical testing method, mechanical testing environment box and operation method of mechanical testing environment box

Abstract

The invention discloses a mechanical test method, a mechanical test environment box and an operation method thereof, and the mechanical test 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; an upper clamp for fixing the upper end of the sample is fixedly connected with the upper box body cover; a lower clamp for fixing the lower end of the sample is pivoted with the upper end of the screw rod; a threaded sleeve is arranged in the middle of the screw; a rotor mechanism comprising a coil winding rod fixedly connected with the screw rod is arranged at the lower part of the screw rod; a stator mechanism comprising a strong magnet is arranged at 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 formed in the lower bottom plate; the supporting frame is used for being connected with a lower clamp. Or fixedly connected with the threaded sleeve. 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 present invention relates to the technical field of mechanical testing, and in particular to a mechanical testing method, a mechanical testing environment box and an operating method thereof. Background Art

[0002] Hydrogen energy is considered to be an important clean energy in the new century due to its wide sources, high conversion efficiency, clean combustion products, easy and low-cost storage and transportation, and diversified uses. It has attracted much attention from all countries. 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. At present, hydrogen storage and transportation mainly rely on storage and transportation methods under high-pressure gas. It is crucial to study the mechanical properties of materials under hydrogen pressure environment and clarify the compatibility of materials with hydrogen to ensure the long-term safe and stable operation of hydrogen storage and transportation facilities.

[0003] 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.

[0004] The inventor has found through research that the mechanical testing environment chamber in the prior art still has at least the following defects:

[0005] 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.

[0006] 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

[0007] The object of the present invention is to provide a mechanical testing method, a mechanical testing environment box and an operating method thereof which can prevent hydrogen leakage.

[0008] The present invention provides a mechanical testing 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;

[0009] The upper box cover, the box body and the lower base plate are detachably and tightly connected;

[0010] 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:

[0011] The upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; the lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw;

[0012] A threaded sleeve is sleeved on the middle of the screw; 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;

[0013] The support frame includes a first support frame and a second support frame; each of the support frames includes more than two support arms;

[0014] One end of each support arm of the first support frame includes a connection portion for sliding connection with the inner wall of the box body; the other end of each support arm of the first support frame is fixedly connected to the lower clamp;

[0015] One end of each support arm of the second support frame is fixedly connected to the inner wall of the box body; the other end of each support arm of the second support frame is fixedly connected to the threaded sleeve.

[0016] 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:

[0017] A first fastening bolt used for sealingly connecting the upper box cover and the box body;

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

[0019] Sealing rings are respectively arranged in the groove of the upper box cover and the groove of the lower bottom plate.

[0020] Preferably, in an embodiment of the present invention, the bearing cover is provided with a plurality of support arms in the circumferential direction; and the threaded sleeve is provided with a plurality of support arms in the circumferential direction.

[0021] Preferably, in an embodiment of the present invention, the support frame comprises:

[0022] The support frame is in a cross shape or a cross shape.

[0023] 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.

[0024] Preferably, in an embodiment of the present invention, the rotor mechanism includes a coil winding rod fixedly connected to the screw rod, including:

[0025] 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.

[0026] Preferably, in an embodiment of the present invention, the structure of the strong magnet and the coil winding rod includes:

[0027] 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.

[0028] Preferably, in an embodiment of the present invention, the control mechanism comprises:

[0029] Coil circuit control module, pressure sensing module and mechanical properties testing module.

[0030] Preferably, in an embodiment of the present invention, the lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw rod, comprising:

[0031] The lower clamp is pivotally connected to the upper end of the screw rod through a bearing;

[0032] The lower clamp is fixedly connected to a bearing cover sleeved on the outside of the bearing.

[0033] Preferably, in an embodiment of the present invention, the support arm comprises:

[0034] The supporting arm is a bar-shaped rod.

[0035] In another aspect of the present invention, a mechanical testing method is also provided, which is applicable to the above-mentioned mechanical testing environment box, comprising the steps of:

[0036] 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;

[0037] S12, calculating the current value required by the coil according to the pulling force value required by the experiment;

[0038] 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.

[0039] Preferably, in the embodiment of the present invention, it also includes:

[0040] 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.

[0041] Preferably, in an embodiment of the present invention, the preset gas types include:

[0042] Nitrogen and / or hydrogen.

[0043] 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:

[0044] Stabilize the environmental chamber.

[0045] In another aspect of the present invention, a method for operating a mechanical testing environment box is provided, which is applicable to the above-mentioned mechanical testing environment box. The method for operating the mechanical testing environment box is used before the above-mentioned mechanical testing method, and comprises the following steps:

[0046] S21, connecting and assembling the coil winding rod and the screw rod into an integrated structure;

[0047] S22, screwing the integrated structure into the bottom of the box along the threaded sleeve and rotating it upwards, and after passing through the threaded sleeve, assembling the bearing on the upper end of the screw; and assembling the bearing cap with the first support frame and the bearing from the upper part of the box;

[0048] S23, assembling the sample on the upper fixture and the lower fixture, and fixing the integral structure with the sample, the upper fixture and the lower fixture to the bearing cover, and covering the upper box cover;

[0049] S24, adjusting the position of the first support frame from the lower end of the box body so that the upper clamp fits the upper box body cover; fixing the upper box body cover and the upper clamp in a symmetrical installation sequence; fixing the upper box body cover and the box body in the same installation sequence;

[0050] S25, placing the assembled box body on the lower base plate in accordance with the alignment of the sealing ring and the bolt holes, and fixing the box body and the lower base plate in a symmetrical installation order.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The present invention provides a mechanical testing 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 a first support frame and a second support frame; each support frame comprises more than two support arms; one end of each support arm of the first support frame comprises a connecting portion for sliding connection with the inner wall of the box body; the other end of each support arm of the first support frame is fixedly connected to the lower clamp; thereby realizing the sliding connection between the first support frame and the box body; the upper box cover, the box body and the lower bottom plate are detachable The upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; the lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw; 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; thereby, the entire stretching mechanism can be sealed in the environmental 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 the downward rotation of the screw.

[0053] 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; since the threaded sleeve is fixedly connected to the inner wall of the box, when the screw rotates downward, it will generate a downward pulling force on the lower clamp connected to the screw; 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.

[0054] 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.

[0055] 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

[0056] 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.

[0057] Figure 1 It is a structural schematic diagram of the mechanical testing environment box in the present invention;

[0058] Figure 2 It is a top view schematic diagram of the screw rotating structure in the present invention;

[0059] Figure 3 is a step diagram of the mechanical testing method of the present invention;

[0060] Figure 4 It is a step diagram of the operating method of the mechanical testing environment box in the present invention. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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.

[0064] Embodiment 1

[0065] 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 10, a lower bottom plate 18, a control mechanism 22 and a stretching mechanism;

[0066] The upper box cover 1, the box body 10 and the lower base plate 18 are detachably and tightly connected;

[0067] The stretching mechanism includes an upper fixture 2, a lower fixture 5, a support frame 13, a support frame 14, a threaded sleeve 8, a screw 15, a rotor mechanism and a stator mechanism, wherein:

[0068] The upper fixture 4 for fixing the upper end of the sample is fixedly connected to the upper box cover 1; the lower fixture 5 for fixing the lower end of the sample is pivotally connected to the upper end of the screw 15 through the bearing 7;

[0069] A threaded sleeve 8 is sleeved in the middle of the screw 15; a rotor mechanism is provided at the lower part of the screw 15; the rotor mechanism includes a coil winding rod 9 fixedly connected to the screw 15; 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; the coil of the coil winding rod 9 is connected to the control mechanism 22 circuit through a lead hole provided on the lower bottom plate 18;

[0070] The support frame includes a first support frame 13 and a second support frame 14; each of the support frames includes more than two support arms;

[0071] One end of each support arm of the first support frame 13 includes a connection portion for slidingly connecting with the inner wall of the box body 10; the other end of each support arm of the first support frame 13 is fixedly connected with the bearing cover 12 sleeved on the outside of the bearing 7;

[0072] One end of each support arm of the second support frame is fixedly connected to the inner wall of the box body 10 ; the other end of each support arm of the second support frame is fixedly connected to the threaded sleeve 8 .

[0073] 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.

[0074] 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 downward stretching force of the screw; thereby achieving control of the stretching force of the sample; since in the 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.

[0075] Furthermore, in an embodiment of the present invention, the upper box cover 1 and the box body 10 are fixedly connected by a first fastening bolt 11, and the box body 10 and the lower base plate 18 are fixedly connected by a second fastening bolt 17; the upper clamp 2 is fixedly connected to the upper box cover 1 by a bolt 3, the lower clamp 5 is fixedly connected to the bearing cover 12 by a bolt 6, and the lower clamp 5 is pivotally connected to the upper end of the screw 15 by a bearing 7; in addition, sealing rings are respectively provided in the grooves of the upper box cover 1 and the lower base plate 18, and the connecting surface of the upper box cover 1 and the box body 10 is sealed by a sealing ring 21, and the connecting surface of the box body 10 and the lower base plate 18 is sealed by a sealing ring 19; thereby, the sealing effect of the entire environmental chamber is better.

[0076] In order to adjust the upper and lower positions of the lower clamp 5, in an embodiment of the present invention, the first support frame 13 can move up and down in the vertical direction along the inner side of the box body 2, and each support arm is connected to the inner wall of the box body 2 through a connecting portion at one end, and the other end of each support arm is fixedly connected to the bearing cover 12 sleeved on the outside of the bearing 7; the first support frame 13 can be set as two support arms, each support arm is connected to the inner wall of the box body 10 through a connecting portion at one end, and the other end of each support arm is arranged on both symmetrical sides of the bearing cover 12; in this way, the balance and stability of the bearing cover 12 and the lower clamp 5 can be ensured.

[0077] In order to enable the lower fixture 5 to stably fix the lower end of the sample, in an embodiment of the present invention, the bearing cover 12 is circumferentially provided with multiple support arms, and the multiple support arms can be configured as a cross-shaped support frame or a M-shaped support frame, so that the bearing cover 12 and the lower fixture 5 are more stable.

[0078] In addition, the first support frame 13 can also be arranged on both symmetrical sides of the bearing cover 12, and is composed of four parallel support arms. Each support arm is slidably connected to the inner wall of the box body 10 through a connecting part at one end, and the other end of each support arm is fixedly connected to the bearing cover 12, which can ensure the balance and stability of the bearing cover 12 and the lower clamp 5.

[0079] In addition, according to the shape of the environmental chamber, the first support frame 13 can also be set as three support arms, and each support arm is slidably connected to the inner wall of the box body 10 through a connecting part at one end; the other end of each support arm is fixedly connected to the bearing cover 12 to form a Y shape, which can also ensure the balance and stability of the bearing cover 12 and the lower clamp 5.

[0080] In order to stabilize the threaded sleeve 8, further, in the embodiment of the present invention, the threaded sleeve 8 is circumferentially fixed with a plurality of support arms; the plurality of support arms can be set as a cross-shaped support frame or a cross-shaped support frame, one end of each support arm is fixedly connected to the inner wall of the box body 10, and the other end of each support arm is fixedly connected to the threaded sleeve 8, and cannot be moved along the circumferential direction and vertical direction of the box body 10, so as to make the threaded sleeve 8 more stable. It should be noted that the cross-shaped support frame or the cross-shaped support frame is the second support frame.

[0081] 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 16, which are evenly arranged at the lower part of the inner wall of the box body 10; the three groups of rotors include three groups of coil winding rods 9 with coils, and the coil winding rods 9 with coils are arranged along the circumference of the lower part of the screw 15 and correspond to the positions of the three groups of fixed strong magnets 16, so that a strong electromagnetic field can be generated after the coil is energized; the ends of the coil winding rods 9 close to the strong magnets 16 are set at a certain distance, so that the three groups of coil winding rods 9 can rotate freely.

[0082] Furthermore, in an embodiment of the present invention, the upper end of the screw rod 15 is pivotally connected to the lower clamp 5 via a bearing 7; a bearing cover 12 is provided on the outer side of the bearing 7, and the bearing cover 12 is fixedly connected to the lower clamp 5 via a bolt 6; in addition, the upper end of the screw rod 15 and the lower clamp 5 are pivotally connected via the bearing 7, which can reduce the friction coefficient during the rotation process and also ensure the rotation accuracy of the screw rod 15.

[0083] 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 18 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 9 is energized, and under the action of the strong magnet 16 around the lower part of the box 2, the coil winding rod 9 rotates, further driving the screw 15 to rotate along the threaded sleeve 8, and then the sample is stretched by the downward rotation of the screw 15. It should be noted that the current value required by the coil can be calculated according to the tension value required by 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 rotation of the screw is adjusted to the tension value required by the experiment, so as to meet different stretching requirements.

[0084] In practical applications, the control mechanism 22 in the embodiment of the present invention can supply power to the coil of the coil winding rod 9 via a brush sleeved on the lower end of the screw rod 15 .

[0085] In addition, nitrogen and hydrogen (or one of the gases) are filled into the environmental box through the inflation port of the box body 10, 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 10, so that the ambient pressure in the environmental box is reduced to the preset pressure parameter value.

[0086] 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.

[0087] The specific implementation of the present invention is described below in conjunction with a specific application scenario. Figure 1 In this specific application scenario, first, the coil winding rod 9 and the screw 15 are connected and assembled into an integrated structure; and the integrated structure is screwed into the threaded sleeve 8 from the bottom of the box body 10 and rotated upward. After passing through the threaded sleeve 10, the upper end of the screw 15 is assembled with the bearing 7; and the bearing cover 12 with the first support frame 13 is assembled with the bearing 7 from the upper part of the box body 10; then the sample is assembled on the upper fixture 2 and the lower fixture 5, and the integrated structure with the sample, the upper fixture 2 and the lower fixture 5 is fixedly connected to the bearing cover 12, and the upper box cover 1 is covered; the position of the first support frame 13 is adjusted from the lower end of the box body 10 so that the upper fixture 2 fits the upper box cover 1; the upper box cover 1 and the upper fixture 2 are fixed in a symmetrical installation sequence; the upper box cover 1 and the box body 10 are fixed in the same installation sequence; the assembled box body 10 is placed on the lower base plate 18 according to the alignment of the sealing ring and the bolt hole, and the box body 10 and the lower base plate 18 are fixed in a symmetrical installation sequence.

[0088] 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 9 is energized to generate an electromagnetic field. Under the action of the fixed strong magnets 16 around the lower part of the box body 10, the coil winding rod 9 rotates, further driving the screw 15 to rotate along the threaded sleeve 8, and then the screw 15 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 power supply can be controlled by the coil circuit control module, so that the downward tension generated by the screw 15 rotating along the threaded sleeve 8 is adjusted to the tension value required for the experiment, thereby meeting different stretching requirements.

[0089] In summary, the present invention provides a mechanical testing environment box for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, comprising 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 a first support frame and a second support frame; each support frame comprises more than two support arms; one end of each support arm of the first support frame comprises a connecting portion for sliding connection with the inner wall of the box body; the other end of each support arm of the first support frame is fixedly connected to the lower clamp; thereby realizing the sliding connection between the first support frame and the box body; the upper box cover, the box body and the lower bottom plate are A detachable closed connection; an upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; a lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw; 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; thereby the entire stretching mechanism can be sealed in the environmental 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 screw downward.

[0090] 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; because the threaded sleeve is fixedly connected to the inner wall of the box, when the screw rotates downward, it will generate a downward pulling force on the lower clamp connected to the screw; 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.

[0091] 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.

[0092] Embodiment 2

[0093] The embodiment of the present invention further provides a mechanical testing method adapted to the mechanical testing environment box in the first embodiment. That is, the mechanical testing method in the embodiment of the present invention can be implemented using the mechanical testing environment box in the first embodiment. Figure 3 As shown, the specific steps include:

[0094] S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box.

[0095] 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.

[0096] S12, calculating the current value required by the coil according to the pulling force value required by the experiment;

[0097] 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.

[0098] 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 9 is energized to generate an electromagnetic field, and under the action of the strong magnets 16 around the lower part of the box body 10, the coil winding rod 9 rotates, further driving the screw 15 to rotate along the threaded sleeve 8, and then the downward rotation of the screw 15 realizes the stretching of the sample.

[0099] Furthermore, in the embodiment of the present invention, it also includes:

[0100] 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.

[0101] 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.

[0102] In summary, the present invention provides a mechanical testing environment box for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, comprising 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 a first support frame and a second support frame; each support frame comprises more than two support arms; one end of each support arm of the first support frame comprises a connecting portion for sliding connection with the inner wall of the box body; the other end of each support arm of the first support frame is fixedly connected to the lower clamp; thereby realizing the sliding connection between the first support frame and the box body; the upper box cover, the box body and the lower bottom plate are A detachable closed connection; an upper clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; a lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw; 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; thereby the entire stretching mechanism can be sealed in the environmental 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 screw downward.

[0103] 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; because the threaded sleeve is fixedly connected to the inner wall of the box, when the screw rotates downward, it will generate a downward pulling force on the lower clamp connected to the screw; 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.

[0104] 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.

[0105] Embodiment 3

[0106] Compatible with the mechanical testing environment box in the first embodiment, the present invention also provides an operating method for the mechanical testing environment box. The operating method for the mechanical testing environment box is used before the mechanical testing method in the second embodiment. Figure 4 As shown, the specific steps include:

[0107] S21, connecting and assembling the coil winding rod and the screw rod into an integrated structure;

[0108] S22, screwing the integrated structure into the bottom of the box along the threaded sleeve and rotating it upwards, and after passing through the threaded sleeve, assembling the bearing on the upper end of the screw; and assembling the bearing cap with the first support frame and the bearing from the upper part of the box;

[0109] S23, assembling the sample on the upper fixture and the lower fixture, and fixing the integral structure with the sample, the upper fixture and the lower fixture to the bearing cover, and covering the upper box cover;

[0110] S24, adjusting the position of the first support frame from the lower end of the box body so that the upper clamp fits the upper box body cover; fixing the upper box body cover and the upper clamp in a symmetrical installation sequence; fixing the upper box body cover and the box body in the same installation sequence;

[0111] S25, placing the assembled box body on the lower base plate in accordance with the alignment of the sealing ring and the bolt holes, and fixing the box body and the lower base plate in a symmetrical installation order.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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 testing 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 clamp for fixing the upper end of the sample is fixedly connected to the upper box cover; the lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw; A threaded sleeve is sleeved on the middle of the screw; 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 a first support frame and a second support frame; each of the support frames includes more than two support arms; One end of each support arm of the first support frame includes a connection portion for sliding connection with the inner wall of the box body; the other end of each support arm of the first support frame is fixedly connected to the lower clamp; One end of each support arm of the second support frame is fixedly connected to the inner wall of the box body; the other end of each support arm of the second support frame is fixedly connected to the threaded sleeve.

2. The mechanical 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 testing environment box according to claim 2, characterized in that: The bearing cover is provided with a plurality of support arms in the circumferential direction; The threaded sleeve is provided with a plurality of supporting arms in the circumferential direction.

4. The mechanical 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 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 testing environment box 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 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 testing environment box 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 testing environment chamber according to claim 1, characterized in that: The lower clamp for fixing the lower end of the sample is pivotally connected to the upper end of the screw rod, and comprises: The lower clamp is pivotally connected to the upper end of the screw rod through a bearing; The lower clamp is fixedly connected to a bearing cover sleeved on the outside of the bearing.

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

14. The mechanical 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 testing environment box, applicable to the mechanical testing environment box as claimed in any one of claims 1 to 10, the method for operating the mechanical testing environment box being used before the mechanical testing method as claimed in claim 11, characterized in that: Includes steps: S21, connecting and assembling the coil winding rod and the screw rod into an integrated structure; S22, screwing the integrated structure into the bottom of the box along the threaded sleeve and rotating it upwards, and after passing through the threaded sleeve, assembling the bearing on the upper end of the screw; and assembling the bearing cap with the first support frame and the bearing from the upper part of the box; S23, assembling the sample on the upper fixture and the lower fixture, and fixing the integral structure with the sample, the upper fixture and the lower fixture to the bearing cover, and covering the upper box cover; S24, adjusting the position of the first support frame from the lower end of the box body so that the upper clamp fits the upper box body cover; fixing the upper box body cover and the upper clamp in a symmetrical installation sequence; fixing the upper box body cover and the box body in the same installation sequence; S25, placing the assembled box body on the lower base plate in accordance with the alignment of the sealing ring and the bolt holes, and fixing the box body and the lower base plate in a symmetrical installation order.

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