Electrifiable bidirectional tension and compression mechanical testing machine chuck device

Abstract

The utility model discloses an energizable bidirectional tension and compression mechanical testing machine chuck device, which belongs to the field of material mechanical property testing, and comprises a plurality of machine tools, the plurality of machine tools are oppositely arranged, the number of the machine tools is four, the machine tools are arranged in a cross shape, a mounting plate 102 is integrally arranged at the tail end of the upper surface of each machine tool 100, and a driving assembly 201 is mounted on the mounting plate 102. The output end of a coupler on the driving assembly is connected with a ball screw, the ball screw is slidably sleeved with a sliding table, a connecting plate is arranged at the front end of the sliding table, a mounting hole is formed in the middle of the front surface of the connecting plate, a tension sensor is fixedly inserted into the mounting hole, and the front end of the tension sensor is connected with a clamp. According to the utility model, the yield process of the material in different stress states can be more comprehensively observed by carrying out two-way tension and compression tests on the material under the electrifying condition, and a new yield criterion suitable for the complex loading condition can be established by analyzing the two-way tension and compression test data under the electrifying condition; and the prediction capability on the yield behavior of the material is improved.

Description

Technical Field

[0001] This utility model belongs to the field of material mechanical property testing, specifically a clamping device for an electrically energized bidirectional tensile and compressive mechanical testing machine. Background Technology

[0002] The biaxial tensile and compressive mechanical testing machine is an important piece of equipment used to test the mechanical properties of materials under biaxial tensile and compressive loads. It is widely used to test the yield strength, tensile strength, compressive strength, and elongation of various materials, semi-finished products, and finished products. It can also perform peel, tear, bending, flexural, and compression tests.

[0003] Chinese utility model patent CN206177714U discloses a biaxial tensile and compressive mechanical testing machine. The cross arrangement of four sets of lead screw modules lays the foundation for biaxial tensile testing of cross specimens. The synchronous control of the servo motor realizes the synchronous control of the displacement of the two sets of clamps in the same direction, which can complete biaxial tensile tests under different proportional loading paths. The biaxial tensile testing machine uses a servo motor to provide power and can accurately realize biaxial tensile cross specimens and uniaxial tensile single tensile specimens, and realize tensile tests with variable proportion and variable load.

[0004] While various biaxial tensile testing machines exist on the market, such as mechanical, thermal, and soft material-specific types, a mature and reliable solution has yet to be found for determining the complex behavior of materials under the combined effects of electric fields and mechanical loads. These devices can achieve precise control of biaxial tension and compression of materials at room temperature or under heating conditions, but they still cannot guarantee a uniform distribution of current through the specimen or good insulation performance. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0007] A chuck device for a bidirectional tensile and compressive mechanical testing machine includes multiple machine tools arranged opposite each other and connected by a common block. A mounting plate is integrally formed on the upper surface of each machine tool, and a drive assembly is mounted on the mounting plate. A ball screw is connected to the output end of the drive assembly, and a slide is slidably sleeved on the ball screw. The slide is slidably connected to the upper surface of the machine tool. A connecting plate is provided at the front end of the slide, and a mounting hole is centrally located on the front surface of the connecting plate. A tensile sensor is fixedly inserted into the mounting hole, and a clamp is connected to the front end of the tensile sensor. The clamp includes a base plate with an L-shaped structure. An insulating pad is attached to the upper surface of the base plate, and a support block is fixedly connected to the upper surface of the base plate. A positioning groove is centrally located on the support block, and bolts are fixedly mounted on both sides of the positioning groove on the support block. Positioning blocks are fixedly mounted by the bolts, and an electrode connecting piece is fixedly connected to one of the bolts. The electrode connecting piece has a hole for electrode connection. A groove is formed on the rear surface of the base plate, and the groove is filled with an insulating block.

[0008] A gap is maintained between the positioning block and the support block. A stud is provided through the center of the upper surface of the positioning block, and the stud passes through the lower surface of the positioning block and is connected to a clamping block, which is located on the upper surface of the positioning groove.

[0009] The support block is placed on the surface of the insulating pad. The cross-sectional area of ​​the support block is smaller than the area of ​​the insulating pad. The insulating pad is symmetrically provided with insulating strips on one side of the vertical surface of the substrate, and the insulating strips are in contact with the vertical surface of the substrate.

[0010] Screw holes are provided on the vertical surface of the substrate and the insulating strip. Side plates are symmetrically provided on both sides of the upper surface of the substrate, and the side plates are provided with fixing holes that match the side plates. When the side plates are assembled, the side plates, the insulating strip and the substrate are connected into a whole by screws passing through the side plates and fixing holes in sequence.

[0011] The insulating block and the insulating strip are directly opposite each other. An insulating sheet is attached to the outer surface of the insulating block. Both the insulating block and the insulating sheet have round holes that coincide with the screw holes.

[0012] The drive assembly consists of a coupling, a planetary reducer, and a servo motor. The ball screw is connected to the output end of the coupling on the drive assembly. The mounting plate has mounting holes, through which the coupling is mounted on the rear surface of the mounting plate. The planetary reducer is connected to the input end of the coupling, and the servo motor is connected to the input end of the planetary reducer.

[0013] There are four machine tools in total, arranged in a cross shape, and the four machine tools are connected by a joint block to form a whole.

[0014] The upper surface of the machine tool is symmetrically provided with main slide rails, a first slide plate is slidably connected to the main slide rails, and the slide table is fixed on the first slide plate. A second slide plate is slidably mounted on the main slide rails, and the fixture is mounted on the second slide plate.

[0015] The upper surface of the second slide plate is symmetrically provided with second auxiliary slide rails. The fixture is slidably assembled with the second auxiliary slide rails and connected to the second slide plate through the second auxiliary slide rails. A first auxiliary slide rail is provided at the front end of one side of the machine tool. A connecting piece is connected to a sliding rod on the first auxiliary slide rail. The connecting piece is fixedly connected to the side of the fixture.

[0016] The end of the machine tool is cut to form a mating protrusion, and the side of the joint block is cut to form a mating groove that matches the mating protrusion. Screw holes are provided on both sides of the mating protrusion and both sides of the mating groove. When the machine tool and the joint block are in contact, they are positioned by matching the mating protrusion and the mating groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) In this invention, by conducting biaxial tensile and compressive tests on the material under energized conditions, the yielding process of the material under different stress states can be observed more comprehensively. This helps to reveal the yielding mechanism of the material under complex loading paths, such as whether there is an electroplastic effect, thereby gaining a deeper understanding of the constitutive relationship of the material. Furthermore, the test results can provide a basis for establishing a more accurate yield criterion. Under complex loading paths, the yielding behavior of the material may no longer conform to the traditional yield criterion. By analyzing the biaxial tensile and compressive test data under energized conditions, a new yield criterion applicable to such complex loading conditions can be established, thereby improving the predictive ability of the material's yielding behavior.

[0019] (2) In this utility model, the strengthening deformation behavior of the material may be affected by the current under the energized condition. Through biaxial tensile and compression tests, the strengthening mechanism of the material under different current densities, loading paths and other conditions can be studied, such as electro-hardening, dynamic recovery and recrystallization, so as to have a more comprehensive understanding of the strengthening behavior of the material. At the same time, through the experiment, the influence of different loading paths on the strengthening deformation of the material can be analyzed. For example, the influence of loading sequences such as stretching before compression and compression before stretching on the degree of strengthening and deformation uniformity of the material can be analyzed, so as to provide a reference for the rational design of loading paths in practical engineering applications.

[0020] (2) In this utility model, the electrode connecting piece is fixed to the support block by bolts, enabling energization and meeting the requirements for energized testing. Simultaneously, the insulating design of the fixture, including the insulating pad, insulating strip, insulating block, and insulating sheet, prevents leakage, ensuring test safety, and also avoids interference from the current to other components, ensuring test accuracy.

[0021] (3) In this utility model, the four machine tools are arranged in a cross shape and connected by a joint block to form a whole. This structural design helps to improve the stability of the entire device. By matching and positioning the docking protrusion and the docking groove, and by opening screw holes on both sides of the docking protrusion and the docking groove for connection, the connection between the machine tools is stable, which is beneficial to withstand greater forces during the tensile and compressive test without easily causing structural deformation or misalignment.

[0022] (4) In this utility model, the upper surface of the machine tool is provided with a main slide rail, the slide table is slidably connected to the main slide rail via a first sliding plate, and the fixture is slidably connected to the main slide rail via a second sliding plate. At the same time, the fixture is also slidably assembled with a second auxiliary slide rail. This multi-slide rail design can ensure the accuracy of the movement direction of the fixture during the tension and compression process, reduce the influence of lateral forces, and thus improve the accuracy of the test. In addition, the first auxiliary slide rail on one side of the machine tool is connected to the side of the fixture via a connecting piece, further ensuring the stable movement of the fixture during the tension and compression process. Attached Figure Description

[0023] Figure 1 This is the assembly drawing of the electrically powered bidirectional tensile and compressive mechanical testing machine of this utility model.

[0024] Figure 2 This is a structural diagram of the machine tool assembly in this utility model.

[0025] Figure 3 This is a structural diagram of the tensile and compressive mechanical testing machine of this utility model.

[0026] Figure 4 This is a structural diagram of the machine tool in this utility model.

[0027] Figure 5 The sliding component structure in this utility model Figure 1 .

[0028] Figure 6 The sliding component structure in this utility model Figure 2 .

[0029] Figure 7 This is a structural diagram of the combined block in this utility model.

[0030] Figure 8 This is a structural diagram of the detection component in this utility model.

[0031] Figure 9 This is the assembly drawing of the fixture in this utility model.

[0032] Figure 10 This is a cross-sectional view of the clamp in this utility model.

[0033] Figure 11 This is a structural diagram of the base plate of the clamp in this utility model.

[0034] Figure 12 This is an exploded view of the fixture in this utility model.

[0035] The correspondence between the labels and component names in the attached figures is as follows:

[0036] 100. Machine tool; 101. Docking protrusion; 102. Mounting plate; 103. Main slide rail; 104. First slide plate; 105. Second slide plate; 106. First auxiliary slide rail; 107. Second auxiliary slide rail; 108. Connecting block; 1081. Docking groove;

[0037] 200. Clamping and detection mechanism; 201. Drive assembly (servo motor, planetary reducer, coupling); 202. Ball screw; 2021. Slide table; 203. Connecting plate; 204. Tension sensor; 205. Fixture; 2051. Base plate; 2052. Side plate; 2053. Positioning block; 2054. Support block; 2055. Insulating block; 2056. Insulating sheet; 2057. Electrode connecting piece; 2058. Clamping block; 2059. Insulating pad; 20591. Insulating strip; 20511. Fixing hole; Detailed Implementation

[0038] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0041] See Figure 1 , Figure 2 and Figure 7This diagram illustrates the structure of the base module in the chuck device of the electrically powered bidirectional tensile and compressive mechanical testing machine in this embodiment. The base module includes multiple machine tools 100, arranged opposite each other in a cross shape. The four machine tools 100 are joined together by a connecting block 108 to form a single unit. Compared to single or simple combinations, the cross-shaped arrangement of the four machine tools 100 in this embodiment results in a more uniform force distribution in all directions, reducing the possibility of structural deformation or damage due to uneven force distribution. This improves the overall reliability and durability of the device and enables relative tensile testing of specimens as well as multi-directional tensile testing of irregularly shaped specimens, meeting the requirements of most testing... The tensile test requirements for the components; furthermore, in this embodiment, a mating protrusion 101 is formed at the end of the machine tool 100 by cutting, and a mating groove 1081 adapted to the mating protrusion 101 is formed on the side of the connecting block 108 by cutting. Screw holes are provided on both sides of the mating protrusion 101 and both sides of the mating groove 1081. When the machine tool 100 and the connecting block 108 are connected, the mating protrusion 101 and the mating groove 1081 play a preliminary positioning role in this embodiment, determining the relative positional relationship between the machine tool 100 and the connecting block 108. This is an important guiding part for accurate connection between the two. After the machine tool 100 and the connecting block 108 are positioned by the mating protrusion 101 and the mating groove 1081, the screw holes are used to install bolts and other connecting components. By bolting through the threaded holes, the machine tool 100 and the connecting block 108 can be securely connected together, ensuring the integrity and stability of the entire base module structure. The optimized positioning design of the mating protrusion 101 and the mating groove 1081 allows the machine tool 100 and the connecting block 108 to be positioned quickly and accurately during connection. Compared with connection methods without this positioning structure, it reduces adjustment time and errors during the connection process, improves assembly efficiency and connection accuracy, and thus helps to ensure the precision of the entire base module structure.

[0042] exist Figure 3 and Figure 8In this embodiment, a mounting plate 102 is integrally provided at the end of the upper surface of the machine tool 100. A drive assembly 201 is mounted on the mounting plate 102. In this embodiment, the coordinated operation of the entire drive assembly enables the device to precisely control the magnitude and direction of tension or compression. Compared with traditional power systems, this combination can provide more stable and precise power output, meeting the high-precision requirements of bidirectional tensile and compressive mechanical testing. Specifically, in this embodiment, the drive assembly 201 consists of a coupling, a planetary reducer, and a servo motor. Assembly holes are provided on the mounting plate 102. The coupling is located on the rear surface of the mounting plate 102 and is inserted into the mounting plate 102 through the assembly holes. In this embodiment, the mounting plate 102 provides an accurate installation position for the coupling. The precise design of the assembly holes ensures the accuracy of the coupling installation. The coupling facilitates precise docking between the drive assembly 201 and the machine tool 100, thereby ensuring the accuracy and efficiency of power transmission. The main function of the coupling is to transmit power and, to a certain extent, compensate for the relative displacement of the two connected shafts, allowing for a certain installation error and ensuring the continuity of power transmission. Furthermore, the input end of the coupling is connected to the planetary reducer, and the input end of the planetary reducer is connected to the servo motor. The planetary reducer reduces the output speed of the servo motor while increasing the torque. In the testing machine, different tests may require different forces and speeds. The planetary reducer can adjust the speed and torque input to the ball screw according to the requirements, making the device adaptable to various test requirements. The servo motor, as the power source, provides power to the entire device and, through precise control, meets the tensile or compressive requirements under different test conditions.

[0043] A ball screw 202 is connected to the output end of the coupling on the drive assembly 201. A slide table 2021 is slidably sleeved on the ball screw 202. The slide table 2021 is slidably connected to the upper surface of the machine tool 100. In this embodiment, the ball screw 202 converts the rotational motion of the drive assembly 104 into linear motion. Efficient force transmission is achieved through the rolling of the balls between the screw and the nut. When the ball screw rotates, the slide table can slide linearly on the upper surface of the machine tool 100. A connecting plate 203 is provided at the front end of the slide table 2021. A mounting hole is centrally located on the front surface of the connecting plate 203. A tension sensor 20 is fixedly inserted into the mounting hole. 4. In this embodiment, the connecting plate 203 connects the slide table 2021 and the tension sensor 204. A mounting hole is centrally located on its front surface to provide an accurate mounting position for the tension sensor 204, which plays the role of transmitting tension or pressure. The force transmitted from the slide table 2021 is accurately transmitted to the tension sensor 204. The front end of the tension sensor 204 is connected to the clamp 205, and the tension sensor 204 measures the magnitude of the tension or pressure on the clamp 205. During the test, the clamp 205 applies tension or pressure to the specimen, and the tension sensor 204 can sense and accurately measure the magnitude of these forces in real time, providing key data for the acquisition of test data.

[0044] exist Figure 4-6 In this embodiment, a main slide rail 103 is symmetrically arranged on the upper surface of the machine tool 100. A first slide plate 104 is slidably connected to the main slide rail 103, and a second slide plate 105 is slidably mounted on the main slide rail 103. In this embodiment, a sliding track is provided for the first slide plate 104 and the second slide plate 105 to constrain their movement direction, so that they can only slide in a straight line along the direction of the main slide rail 103, thereby ensuring the movement accuracy of the entire device during operation. The optimized and symmetrically arranged main slide rail 103 can evenly distribute the weight of the first slide plate 104 and the second slide plate 105 as well as the force generated during the movement, ensuring the stability of the slide plate movement. Compared to a single-rail design, this design reduces the possibility of rail wear or slide jamming due to uneven force distribution, improving the reliability and service life of the device. Furthermore, the slide table 2021 is fixed to the first slide plate 104. When the slide table 2021 moves linearly under the drive of the ball screw 202, the first slide plate 104 slides along the main slide rail 103. Optimized by this design, the presence of the first slide plate 104 makes the movement of the slide table 2021 smoother, reducing friction and shaking that may occur due to direct contact between the slide table 2021 and the upper surface of the machine tool 100. Simultaneously, the sliding connection with the main slide rail 103 improves the motion accuracy of the entire transmission system, facilitating accurate control of the application of tension or pressure. The clamp 205 is mounted on the second slide plate 105, allowing the clamp 205 to adjust its position as it slides on the main slide rail 103, providing support and guidance for the movement of the clamp 205. Optimized by this design, the second slide plate 105 coordinates the movement of the clamp 205 with the movement of other components of the entire device. By sliding on the main slide rail 103, the fixture 205 can maintain an accurate positional relationship under different working conditions such as adjusting the position of the specimen, applying tension or pressure, etc., which improves the flexibility and adaptability of the device. The upper surface of the second slide plate 105 is symmetrically provided with a second auxiliary slide rail 107. The fixture 205 is slidably assembled with the second auxiliary slide rail 107 and connected to the second slide plate 105 through the second auxiliary slide rail 107. The second auxiliary slide rail 107 provides an additional sliding track for the fixture 205, so that the fixture 205 can be precisely fine-tuned on the second slide plate 105. A first auxiliary slide rail 106 is provided on the front end of one side of the machine tool 100. A connecting piece is connected to the sliding rod on the first auxiliary slide rail 106. The connecting piece is fixedly connected to the side of the fixture 205. The first auxiliary slide rail 106 provides support and constraint for the fixture 205 in another direction. During the test, the first auxiliary slide rail 106 can help the fixture 205 maintain a stable position and limit and guide its movement direction when the fixture 205 moves.

[0045] exist Figure 9 , Figure 10 and Figure 11In this embodiment, the fixture 205 includes a base plate 2051. The base plate 2051 serves as the basic structural component of the fixture 205, providing a platform for the installation and support of other components. The base plate 2051 has an L-shaped structure to accommodate the installation of different components. A support block 2054 is fixedly connected to the upper surface of the base plate 2051. A positioning groove is centrally formed on the support block 2054, and bolts are fixedly arranged on both sides of the positioning groove on the support block 2054. Positioning blocks 2053 are fixedly arranged by the bolts. In this embodiment, the positioning blocks 2053 are provided with installation positions for the support block 2054, and the positioning groove on the support block 2054 is used to determine the initial position of the specimen. The presence of the positioning groove allows the specimen to... The more accurate placement within the fixture helps ensure consistent initial positions of the specimen in each test, thereby improving the repeatability and accuracy of the test results. A gap is maintained between the positioning block 2053 and the support block 2054. A stud is threaded through the center of the upper surface of the positioning block 2053, and the stud penetrates the lower surface of the positioning block 2053 and connects to a clamping block 2058, which is located on the upper surface of the positioning groove. In this embodiment, the positioning block 2053 and the support block 2054 cooperate, and the clamping block 2058 is connected by the stud to clamp the specimen together. The method of connecting the clamping block and the support block by the stud allows for precise adjustment of the clamping force according to the actual thickness or size of the specimen. The existence of the gap allows the fixture to flexibly adapt to different specimens, avoiding situations where clamping is impossible due to slight differences in specimen size, thus improving the versatility of the fixture.

[0046] It is worth noting that in this embodiment, an electrode connecting piece 2057 is fixedly connected to one of the bolts. In this embodiment, a hole for electrode connection is opened on the electrode connecting piece 2057 for connecting external electrodes. In the bidirectional tensile and compressive mechanical test, the specimen can be energized. The presence of the electrode connecting piece enables the fixture to meet the requirements of the energized test. The simple hole structure facilitates the connection with external electrodes, making the energization operation during the test convenient, and does not affect the clamping function of the fixture.

[0047] In summary: When using fixture 205, the specimen is first placed in the positioning groove of support block 2054 to initially determine the position of the specimen. Then, according to the thickness or size of the specimen, the distance between clamping block 2058 and positioning block 2053 is adjusted by rotating the stud, so that clamping block 2058 gradually moves closer to the specimen and clamps the specimen together with positioning block 2053. When an electrical test is required, an external electrode is connected through the hole on electrode connecting piece 2057, so that the electrical operation can be achieved while applying tension or pressure to the specimen, thus meeting the requirements of bidirectional tensile and compressive mechanical testing.

[0048] exist Figure 11 and Figure 12In this embodiment, an insulating pad 2059 is attached to the upper surface of the substrate 2051, and a support block 2054 is placed on the surface of the insulating pad 2059. The cross-sectional area of ​​the support block 2054 is smaller than that of the insulating pad 2059. In this embodiment, the insulating pad 2059 mainly serves as insulation in the bidirectional tensile and compressive mechanical test, preventing current from being conducted through the substrate 2051 and causing unnecessary circuit interference or safety hazards. It also provides an insulating support surface for the support block 2054, ensuring the electrical safety of the fixture 205 during the energized test and avoiding short circuits in the test specimen or damage to the test equipment that may be caused by the conductivity of the fixture 205 components. In addition, the insulating pad 2059 reduces the contact area between the support block 2054 and the substrate 205. To prevent wear or corrosion that may occur due to direct contact between the substrate 2051 and the insulating pad 2059, insulating strips 20591 are symmetrically arranged on one side of the vertical surface of the substrate 2051. The insulating strips 20591 are in contact with the vertical surface of the substrate 2051. The insulating strips 20591 increase the insulation performance of the clamp in the vertical direction and, together with the insulating pad 2059, form a more comprehensive insulation system to prevent current leakage from the vertical surface of the substrate 2051. In summary, the insulating strips 20591 and the insulating pad 2059 work together to improve the overall insulation effect of the clamp 205. In complex test environments, especially in environments with multiple electrical components or high voltage, the comprehensive insulation design can better protect the normal conduct of the test and the operators. For safety, screw holes are provided on both the vertical surface of the substrate 2051 and the insulating strip 20591. Side plates 2052 are symmetrically arranged on both sides of the upper surface of the substrate 2051, and each side plate 2052 has a corresponding fixing hole. When the side plates 2052 are assembled, screws are passed through the side plates 2052 and the fixing holes in sequence to connect the side plates 2052, the insulating strip 20591, and the substrate 2051 into a whole. In this embodiment, the side plates 2052 strengthen the overall structure of the clamp 205, connecting the various components together and improving the overall strength and stability of the clamp 205. Furthermore, during testing, the clamp 205 needs to withstand tensile or compressive forces, and the side plates 2052 can provide sufficient protection. These forces are effectively dispersed to prevent loosening or deformation between the components of the clamp 205, thereby ensuring the clamping effect of the clamp 205 on the specimen and the accuracy of the test data. A groove is opened on the rear surface of the substrate 2051, and the groove is filled with an insulating block 2056. The insulating block 2056 is directly opposite the insulating strip 20591. In this embodiment, the insulating block 2056 is filled in the groove opened on the rear surface of the substrate 2051, providing additional insulation protection at the rear of the clamp 205, further enhancing the insulation performance of the clamp 205 in this area, and preventing current leakage from the rear of the substrate 2051. Furthermore, the insulating block 2056, the insulating pad 2059, and the insulating strip 20591 together constitute multi-directional insulation protection.This method of setting insulating components in different positions takes into account the insulation requirements of the fixture in various possible current conduction paths, so that the fixture can more reliably prevent leakage during power-on testing. Furthermore, an insulating sheet 2055 is attached to the outer surface of the insulating block 2056. The insulating sheet 2055 plays an auxiliary insulation role and also provides a certain degree of protection for the insulating block 2056, preventing it from being damaged by external factors. It should be noted that both the insulating block 2056 and the insulating sheet 2055 have round holes, and the round holes overlap with the screw holes and there are no fixing screws passing through the round holes and screw holes to fix the side plate 2052 to the base plate 2051.

[0049] In summary, the experimental steps of this embodiment are as follows:

[0050] Specimen installation: When using the fixture, the clamping edge of the cross-shaped specimen is placed on the support block 2054 and clamped by the clamping structure of the fixture 205.

[0051] Preparation for power-on: Fix the electrode connecting piece 2057 to the fixture, insert the electrode into the electrode connecting piece 2057, and adjust the power-on parameters. In the bidirectional tensile and compressive mechanical test, due to the insulation design of each component of the fixture 205, when applying tensile or compressive force to the specimen and performing the power-on operation, the current can be ensured to power the specimen through the electrode connecting piece 2057 and other components according to the predetermined path, without leakage or circuit interference.

[0052] Parameter settings: In this embodiment, the external host computer is connected to this device via signal. The host computer interface sets the initial parameters, including the load, the servo motor speed of each lead screw module, etc.

[0053] Test start: The host computer drives the servo motor of ball screw 202 to move according to the initial parameters, and performs bidirectional tensile testing on the specimen;

[0054] Data acquisition: During the stretching process, the tension sensor 204 detects the change in tension on the test piece in real time, the grating ruler measures the change in position of the slide table in real time, and uploads the data to the host computer for storage;

[0055] Safety control: The host computer monitors in real time whether the slide has reached the shortest and longest strokes, controls the movement range of each sliding component, and ensures test safety;

[0056] Data analysis: The host computer obtains the biaxial tensile properties of the test specimen by correlating and analyzing the changes in the tensile force on the specimen and the position changes of the slide.

[0057] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A chuck device for an electrically energized bidirectional tensile and compressive mechanical testing machine, comprising multiple machine tools (100), the multiple machine tools (100) being arranged opposite to each other, and a connecting block (108) being connected between the machine tools (100). Its features are: A mounting plate (102) is integrally provided at the end of the upper surface of the machine tool (100). A drive assembly (201) is mounted on the mounting plate (102). A ball screw (202) is connected to the output end of the drive assembly (201). A slide table (2021) is slidably sleeved on the ball screw (202). The slide table (2021) is slidably connected to the upper surface of the machine tool (100). A connecting plate (203) is provided at the front end of the slide table (2021). A mounting hole is provided in the center of the front surface of the connecting plate (203). A tension sensor (204) is fixedly inserted into the mounting hole. A clamp (205) is connected to the front end of the tension sensor (204). 5) Includes a substrate (2051), which has an L-shaped structure. An insulating pad (2059) is attached to the upper surface of the substrate (2051). A support block (2054) is fixedly connected to the upper surface of the substrate (2051). A positioning groove is provided in the center of the support block (2054), and bolts are fixedly provided on both sides of the positioning groove on the support block (2054). A positioning block (2053) is fixedly provided by the bolts. An electrode connecting piece (2057) is fixedly connected to one of the bolts, and a hole for electrode connection is provided on the electrode connecting piece (2057). A groove is provided on the rear surface of the substrate (2051), and the groove is filled with an insulating block (2056).

2. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 1, characterized in that: A gap is maintained between the positioning block (2053) and the support block (2054). A stud is provided through the center of the upper surface of the positioning block (2053), and the stud passes through the lower surface of the positioning block (2053) and is connected to a clamping block (2058). The clamping block (2058) is located on the upper surface of the positioning groove.

3. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 1, characterized in that: The support block (2054) is placed on the surface of the insulating pad (2059). The cross-sectional area of ​​the support block (2054) is smaller than the area of ​​the insulating pad (2059). The insulating pad (2059) is symmetrically provided with insulating strips (20591) on one side of the vertical surface of the substrate (2051), and the insulating strips (20591) are attached to the vertical surface of the substrate (2051).

4. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 3, characterized in that: Screw holes are provided on the vertical surface of the substrate (2051) and the insulating strip (20591). Side plates (2052) are symmetrically provided on both sides of the upper surface of the substrate (2051), and the side plates (2052) are provided with fixing holes that match the side plates (2052). When the side plates (2052) are assembled, the side plates (2052), the insulating strip (20591) and the substrate (2051) are connected into a whole by screws passing through the side plates (2052) and fixing holes in sequence.

5. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 4, characterized in that: The insulating block (2056) and the insulating strip (20591) are directly opposite each other. An insulating sheet (2055) is attached to the outer surface of the insulating block (2056). Both the insulating block (2056) and the insulating sheet (2055) have round holes, and the round holes coincide with the screw holes.

6. The chuck device for an electrically energized bidirectional tensile and compressive mechanical testing machine according to claim 1, characterized in that: The drive assembly (201) consists of a coupling, a planetary reducer, and a servo motor. The ball screw (202) is connected to the output end of the coupling on the drive assembly (201). The mounting plate (102) has mounting holes. The coupling is mounted on the rear surface of the mounting plate (102) through the mounting holes. The planetary reducer is connected to the input end of the coupling. The servo motor is connected to the input end of the planetary reducer.

7. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 1, characterized in that: There are four machine tools (100) in total, and the four machine tools (100) are arranged in a cross shape. The four machine tools (100) are connected by a connecting block (108) to form a whole.

8. The chuck device for an electrically energized bidirectional tensile and compressive mechanical testing machine according to claim 1, characterized in that: The upper surface of the machine tool (100) is symmetrically provided with main slide rails (103), a first slide plate (104) is slidably connected on the main slide rails (103), and a slide table (2021) is fixed on the first slide plate (104). A second slide plate (105) is slidably mounted on the main slide rails (103), and a clamp (205) is mounted on the second slide plate (105).

9. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 8, characterized in that: The upper surface of the second slide plate (105) is symmetrically provided with a second auxiliary slide rail (107). The fixture (205) is slidably assembled with the second auxiliary slide rail (107) and connected to the second slide plate (105) through the second auxiliary slide rail (107). The front end of one side of the machine tool (100) is provided with a first auxiliary slide rail (106). A connecting piece is connected to the sliding rod on the first auxiliary slide rail (106). The connecting piece is fixedly connected to the side of the fixture (205).

10. The chuck device for an electrically conductive bidirectional tensile and compressive mechanical testing machine according to claim 1, characterized in that: The end of the machine tool (100) is formed by cutting to form a docking protrusion (101), and the side of the joint block (108) is formed by cutting to form a docking groove (1081) that matches the docking protrusion (101). Screw holes are provided on both sides of the docking protrusion (101) and both sides of the docking groove (1081). When the machine tool (100) and the joint block (108) are in contact, they are positioned by the docking protrusion (101) and the docking groove (1081) matching.

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