Tool for composite board shear test and test method

Abstract

The invention discloses a tool for a composite board shear test and a test method, and belongs to the technical field of shear tests.The tool comprises a tool base, four moving holes are formed in the tool base, placing grooves are formed in the positions, corresponding to the two moving holes, of the lower portion of the tool base, and two clamping plates are connected to the tool base in a sliding mode. According to the clamping tool, the connecting frame, the transfer box, the transverse plate and the transverse rod are adopted, it can be guaranteed that the contact strength between the clamping plates and the composite board is kept stable in the whole clamping process, the reliability of the tool is improved through stable clamping, a solid foundation is provided for subsequent shear force testing, high-precision and stable clamping of the composite board is achieved, and the clamping tool is suitable for being used for a large-scale production line. And the influence of factors such as non-uniform force and inaccurate positioning on the shearing force test result in a traditional clamping mode is effectively eliminated, so that the shearing force test precision and credibility are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of shear testing, and particularly relates to a tooling and a test method for the shear test of composite plates. Background Art

[0002] In the existing sheet metal processing field, there are generally certain limitations in the clamping methods of tooling for sheets. Specifically, the workpiece is usually placed at a preset fixed position, and then clamping force is applied inward by the clamping plates on both sides to achieve the positioning and clamping of the workpiece. However, this clamping method is affected by various factors and it is difficult to ensure the uniformity and stability of clamping.

[0003] First of all, when the workpiece is placed, its own position may not be exactly at the center of the clamping plate, resulting in a difference in the distance between the workpiece and the clamping plates on both sides. This difference further causes the clamping forces applied by the clamping plates on both sides to the workpiece to be unbalanced during the clamping process, affecting the stability of clamping.

[0004] Secondly, dirt, foreign objects, etc. that may exist on the surface of the workpiece will interfere with the full contact of the clamping surface, further weakening the effective transmission of the clamping force. This insufficient contact not only reduces the reliability of clamping, but may also have an adverse impact on the subsequent shear force test results, reducing the accuracy and credibility of the test data.

[0005] Based on this, the present invention designs a tooling and a test method for the shear test of composite plates to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a tooling and a test method for the shear test of composite plates to solve the problems in the above background art.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: A tooling for the shear test of composite plates includes a tooling base. Four moving holes are provided on the tooling base. Placement grooves are provided under the tooling base corresponding to two of the moving holes. Two clamping plates are slidably connected to the tooling base. Two driving components are connected to the mutually remote sides of the two clamping plates. An activity seat is fixedly connected to the outside of the driving component. A moving block is connected under the activity seat. A middle seat is connected to the opposite surfaces of the two left moving blocks. An activity limiting mechanism is provided on the middle seat. A middle pipe communicates with the side of the activity limiting mechanism. The other end of the middle pipe communicates with a connecting pipe. Both ends of the connecting pipe communicate with a gas control mechanism. The gas control mechanism is connected to the side of the activity seat and contacts the clamping plate. A moving adjustment mechanism is connected to the opposite surfaces of the two middle seats and is arranged in the placement groove.

[0008] As a further description of the above technical solution: The placement groove communicates with the two moving holes, the moving block is slidably connected in the moving hole, and a limiting groove is provided in the top wall of the placement groove corresponding to the position of the movable limiting mechanism.

[0009] As a further description of the above technical solution: The movable limiting mechanism includes an air frame connected to the intermediate seat. A slide plate is slidably connected in the air frame. A vertical rod is connected to the slide plate, and a limiting block is fixedly connected to the top end of the vertical rod. The size of the limiting block is adapted to the limiting groove.

[0010] As a further description of the above technical solution: The side surface of the air frame communicates with an intermediate pipe penetrating through the intermediate seat. The intermediate pipe penetrates and is connected to the tooling seat. A guide sleeve is penetrated and connected to the air frame, and the vertical rod is slidably connected in the guide sleeve.

[0011] As a further description of the above technical solution: The gas control mechanism includes a piston frame connected to the side surface of the movable seat. A piston plate is slidably connected in the piston frame. A contact rod is connected to the side surface of the piston plate, and the other end of the contact rod contacts the clamping plate. A connecting sleeve is slidably connected outside the contact rod, and the connecting sleeve penetrates and is connected to the side surface of the piston frame. An elastic component connected to the piston plate and the inner wall of the piston frame is sleeved outside the contact rod. The piston frame communicates with a connecting pipe.

[0012] As a further description of the above technical solution: The moving and adjusting mechanism includes a connecting frame and a transfer box. The connecting frame and the transfer box are fixedly connected in the placement groove. Two cross plates are slidably connected in the connecting frame. A cross rod is fixedly connected to the side of the cross plate close to the intermediate seat, and the cross rod penetrates and is slidably connected to the side surface of the connecting frame.

[0013] As a further description of the above technical solution: One end of the cross rod located outside the connecting frame is fixedly connected to the intermediate seat. Two gas adding pipes are provided outside the transfer box, and the other ends of the gas adding pipes communicate with the connecting frame. An air inlet pipe communicates with the back surface of the transfer box, and the air inlet pipe penetrates and is connected in the tooling seat. An air outlet pipe communicates with the connecting frame, and the air outlet pipe communicates between the air outlet head and the part of the connecting frame located between the two cross plates.

[0014] A test method for a tooling for composite board cutting and shearing test, the method includes the following steps: First, assemble the tooling onto the experimental device. Then, place the composite board to be tested between two clamping plates. Inject gas into the transfer box through the intake pipe. The gas in the transfer box enters the connection frame through the gas injection pipe. While the air pressure in the connection frame increases, control the cross plate, cross bar, and middle seat to move closer to the composite board until one of the clamping plates contacts the composite board and is blocked by it. The other clamping plate continues to move until both clamping plates are in contact with the composite board. Since the air pressure controlling the movement of the cross plate acts on both clamping plates simultaneously, the force applied by the clamping plates to the composite board is the same. At this time, control the driving component to work. The driving component controls the movement of the clamping plates to perform a clamping action on the composite board, and the clamping plates move away from the contact rod; The elastic component controls the movement of the piston plate. The gas in the piston plate is transferred to the air frame. The air pressure in the air frame controls the upward movement of the sliding plate and the limiting block. The limiting block is inserted into the limiting groove to realize the limitation of the movable seat and the driving component. When the driving component clamps the composite board through the clamping plates, the applied force is the same. During the process of the two cross plates approaching each other, the gas in the connection frame is squeezed out through the outlet pipe and the air outlet head. The discharged gas blows on the surface of the composite board to clean the composite board to a certain extent, ensuring that the clamping surface of the composite board will not be affected by sundries; Then, shear force can be applied to both sides of the composite board through the experimental device to conduct a shear experiment.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. In the present invention, by using a connection frame, a transfer box, a cross plate, and a cross bar, the gas in the transfer box uniformly enters the connection frame through the gas injection pipe, so that the air pressure in the connection frame increases synchronously. This design ensures that the cross plate, cross bar, and middle seat approach the composite board synchronously under the action of air pressure, realizing the balanced clamping of the two clamping plates on the composite board. When one of the clamping plates first contacts the composite board and is blocked, the other clamping plate continues to move until both are in close contact with the composite board. The air pressure controlling the movement of the cross plate acts on both clamping plates simultaneously and evenly, ensuring that the force applied between the clamping plates and the composite board is always the same, guaranteeing that when the two clamping plates initially contact the composite board, the applied force reaches an equilibrium state. The balanced clamping force effectively avoids the displacement or deformation of the composite board caused by uneven force, thereby realizing the precise positioning of the composite board. With precise control of air pressure, the present invention can ensure that the contact force between the clamping plates and the composite board remains stable throughout the clamping process. This stable clamping not only improves the reliability of the tooling but also provides a solid foundation for subsequent shear force testing, realizing high-precision and stable clamping of the composite board, effectively eliminating the influence of factors such as uneven force and inaccurate positioning in traditional clamping methods on the shear force test results, and thus significantly improving the accuracy and credibility of the shear force test.

[0016] 2. In the present invention, a limit block, a limit groove, an air frame, a contact rod and an elastic component are adopted. In the process that the clamping plate is controlled by the driving component to clamp the composite plate, the clamping plate moves away from the contact rod. At this time, the elastic component accurately controls the movement of the piston plate to ensure that the gas in the piston plate is smoothly transferred to the air frame. The uniform increase of the air pressure in the air frame controls the sliding plate and the limit block to move upward synchronously, and the limit block is accurately inserted into the limit groove, thereby realizing the precise limitation of the movable seat and the driving component. Through the above-mentioned limiting mechanism, the present invention ensures that the positions of the two clamping plates after contact with the composite plate are accurately positioned. This design effectively avoids the problem of unstable clamping caused by inaccurate position in the traditional clamping method, and ensures that the movable seat can remain stable after the clamping plates on both sides initially contact the composite plate, thereby providing a solid foundation for subsequent shear tests. The precise position control and stable clamping and positioning functions of the present invention effectively eliminate the adverse factors such as displacement and shaking that may occur during the clamping process, and significantly improve the reliability and consistency of the composite plate shear test.

[0017] 3. In the present invention, a transverse plate, an air outlet pipe and an air outlet head are used. During the movement of the clamping plate, the transverse plate moves synchronously therewith and effectively squeezes the gas in the connecting frame. The gas is discharged through the carefully designed air outlet holes and the air outlet head to form a directional airflow. This airflow blows directly on the surface of the composite board to effectively remove debris and dirt on the surface. The gas discharged through the air outlet head cleans the surface of the composite board in real time, ensuring that the clamping surface of the composite board is always in a clean state. This design effectively avoids the problem of unstable clamping or uneven force caused by interference from debris. The clean clamping surface ensures sufficient contact between the clamping plate and the composite board, thereby improving the accuracy and stability of clamping, which provides a more accurate and reliable basic condition for subsequent shear force testing. The automatic cleaning function of the present invention integrates the cleaning work of the surface of the composite board into the clamping process, without the need for additional cleaning steps, simplifying the operation process and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural schematic diagram of a composite plate shear test fixture and test method proposed by the present invention; Figure 2 It is a bottom-up three-dimensional structural schematic diagram of a composite plate shear test tool and a test method proposed by the present invention; Figure 3 A bottom-up three-dimensional structural schematic diagram of a tooling base for a composite plate shear test tooling and a test method proposed by the present invention; Figure 4 A schematic diagram of a three-dimensional cross-sectional structure of a tooling base for a composite plate shear test tooling and a test method proposed by the present invention; Figure 5 A composite plate shear test tool and test method proposed by the present invention Figure 4Schematic diagram of the enlarged structure of part A; Figure 6 Schematic diagram of the three-dimensional structure of the middle seat of a fixture and a test method for the shear test of a composite plate proposed by the present invention; Figure 7 Schematic diagram of the three-dimensional sectional structure of the movable limit mechanism of a fixture and a test method for the shear test of a composite plate proposed by the present invention; Figure 8 Schematic diagram of the three-dimensional sectional structure of the gas control mechanism of a fixture and a test method for the shear test of a composite plate proposed by the present invention; Figure 9 Schematic diagram of the three-dimensional sectional structure of the moving and adjusting mechanism of a fixture and a test method for the shear test of a composite plate proposed by the present invention.

[0019] Legend: 1. Fixture seat; 2. Moving hole; 3. Placing groove; 4. Clamping plate; 5. Driving assembly; 6. Movable seat; 7. Moving block; 8. Middle seat; 9. Movable limit mechanism; 91. Air frame; 92. Slide plate; 93. Vertical rod; 94. Guide sleeve; 95. Limit block; 10. Middle pipe; 11. Connecting pipe; 12. Gas control mechanism; 121. Piston frame; 122. Piston plate; 123. Contact rod; 124. Connecting sleeve; 125. Elastic component; 13. Moving and adjusting mechanism; 131. Connecting frame; 132. Transfer box; 133. Horizontal plate; 134. Cross bar; 135. Gas adding pipe; 136. Inlet pipe; 137. Outlet pipe; 14. Air outlet head; 15. Limit groove. Specific implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] Please refer to the attached Figure 1 - attached Figure 9, the present invention provides a technical solution: a tooling for the shear test of a composite board, including a tooling base 1, on which four moving holes 2 are provided. At the positions corresponding to two of the moving holes 2 under the tooling base 1, a placement groove 3 is provided. Two clamping plates 4 are slidably connected to the tooling base 1. On the sides of the two clamping plates 4 away from each other, two driving components 5 are connected. An activity seat 6 is fixedly connected to the outside of the driving component 5. A moving block 7 is connected to the lower part of the activity seat 6. On the opposite surfaces of the two left moving blocks 7, an intermediate seat 8 is connected. An activity limiting mechanism 9 is provided on the intermediate seat 8. A middle pipe 10 is communicated with the side of the activity limiting mechanism 9. The other end of the middle pipe 10 is communicated with a communicating pipe 11. Both ends of the communicating pipe 11 are communicated with a gas control mechanism 12. The gas control mechanism 12 is connected to the side of the activity seat 6 and contacts the clamping plate 4. On the opposite surfaces of the two intermediate seats 8, a moving adjustment mechanism 13 arranged in the placement groove 3 is connected.

[0022] Specifically, as Figures 1-3 shown, the placement groove 3 is communicated with the two moving holes 2. The moving block 7 is slidably connected in the moving hole 2. At the position corresponding to the activity limiting mechanism 9 on the inner top wall of the placement groove 3, a limiting groove 15 is provided.

[0023] Specifically, as Figures 6-7 shown, the activity limiting mechanism 9 includes an air frame 91 connected to the intermediate seat 8. A sliding plate 92 is slidably connected in the air frame 91. A vertical rod 93 is connected to the sliding plate 92. The top end of the vertical rod 93 is fixedly connected with a limiting block 95. The size of the limiting block 95 is adapted to that of the limiting groove 15.

[0024] The side of the air frame 91 is communicated with the middle pipe 10 penetrating and connected in the intermediate seat 8. The middle pipe 10 penetrates and is connected to the tooling base 1. A guide sleeve 94 is penetrated and connected to the air frame 91. The vertical rod 93 is slidably connected in the guide sleeve 94.

[0025] By using the cooperation between the limiting block 95 and the limiting groove 15, the positioning of the intermediate seat 8 and the activity seat 6 is realized, so that the clamping plate 4 is kept stable. When the air pressure in the air frame 91 increases, the sliding plate 92 and the vertical rod 93 can be automatically controlled to perform vertical actions; Specifically, as Figures 4-6 and Figure 8 shown, the gas control mechanism 12 includes a piston frame 121 connected to the side of the activity seat 6. A piston plate 122 is slidably connected in the piston frame 121. A contact rod 123 is connected to the side of the piston plate 122. The other end of the contact rod 123 contacts the clamping plate 4. A connecting sleeve 124 is slidably connected to the outside of the contact rod 123. The connecting sleeve 124 penetrates and is connected to the side of the piston frame 121. An elastic component 125 connected to the piston plate 122 and the inner wall of the piston frame 121 is sleeved outside the contact rod 123. The piston frame 121 is communicated with the communicating pipe 11.

[0026] When the driving component 5 controls the clamping plate 4 to move to clamp the composite board, the clamping plate 4 moves away from the contact rod 123, realizing the extrusion and transfer of the gas in the air frame 91 into the piston frame 121. At the same time, when the contact rod 123 is not squeezed, the elastic component 125 will keep the slide plate 92 stable with its elastic force.

[0027] Specifically, as Figure 6 and Figure 9 shown, the moving and adjusting mechanism 13 includes a connecting frame 131 and a transfer box 132. The connecting frame 131 and the transfer box 132 are fixedly connected in the placement groove 3. Two cross plates 133 are slidably connected in the connecting frame 131. One side of the cross plate 133 close to the middle seat 8 is fixedly connected with a cross bar 134. The cross bar 134 penetrates and is slidably connected to the side surface of the connecting frame 131.

[0028] One end of the cross bar 134 outside the connecting frame 131 is fixedly connected with the middle seat 8. Two gas inlet pipes 135 are arranged outside the transfer box 132. The other ends of the gas inlet pipes 135 are communicated with the connecting frame 131. The back of the transfer box 132 is communicated with an air inlet pipe 136. The air inlet pipe 136 penetrates and is connected in the tooling seat 1. An air outlet pipe 137 is communicated with the connecting frame 131. The air outlet pipe 137 is communicated with the air outlet head 14. The air outlet pipe 137 is communicated with the part of the connecting frame 131 between the two cross plates 133.

[0029] The gas in the transfer box 132 enters the connecting frame 131 through the gas inlet pipes 135. While the air pressure in the connecting frame 131 increases, it controls the cross plates 133, the cross bar 134 and the middle seat 8 to move closer to the composite board until one of the clamping plates 4 contacts the composite board and is blocked by the composite board, and the other clamping plate 4 continues to move. Since the air pressures acting on the two cross plates 133 are the same, the forces when the two clamping plates 4 contact the composite board are the same.

[0030] A test method for a tooling for composite board cutting and shearing test, the method includes the following steps: First, assemble the tooling onto the experimental device, then place the composite board to be tested between the two clamping plates 4, inject gas into the transfer box 132 through the air inlet pipe 136. The gas in the transfer box 132 enters the connecting frame 131 through the gas inlet pipes 135. While the air pressure in the connecting frame 131 increases, it controls the cross plates 133, the cross bar 134 and the middle seat 8 to move closer to the composite board until one of the clamping plates 4 contacts the composite board and is blocked by the composite board, and the other clamping plate 4 continues to move until both clamping plates 4 contact the composite board. Since the air pressure controlling the movement of the cross plates 133 acts on the two clamping plates 4 simultaneously, the forces applied by the clamping plates 4 to the composite board are the same. At this time, control the driving component 5 to work. The driving component 5 controls the clamping plate 4 to move to clamp the composite board, and the clamping plate 4 moves away from the contact rod 123; The elastic component 125 controls the movement of the piston plate 122, and the gas inside the piston plate 122 is transferred into the air frame 91. The air pressure inside the air frame 91 controls the upward movement of the slide plate 92 and the limit block 95. The limit block 95 is inserted into the limit groove 15 to realize the limitation of the movable seat 6 and the driving component 5. When the driving component 5 clamps the composite plate through the clamping plate 4, the applied force is the same. During the process that the two cross plates 133 approach each other, the gas inside the connection frame 131 is squeezed out through the air outlet pipe 137 and the air outlet head 14. The discharged gas blows on the surface of the composite plate to perform a certain cleaning on the composite plate, ensuring that the clamping surface of the composite plate will not be affected by sundries; Then, shear forces can be applied to both sides of the composite plate through the experimental device to conduct a shear experiment.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A tool for composite plate shear test, comprising a tool seat (1), characterized in that: The tooling seat (1) is provided with four movable holes (2), and a placement groove (3) is provided under the tooling seat (1) at positions corresponding to the two movable holes (2). Two clamping plates (4) are slidably connected to the tooling seat (1), and two driving components (5) are connected to the sides of the two clamping plates (4) away from each other. The driving component (5) is fixedly connected to a movable seat (6) outside, and a movable block (7) is connected under the movable seat (6). An intermediate seat (8) is connected to the opposite surfaces of the two movable blocks (7) on the left side, and a movable limiting mechanism (9) is provided on the intermediate seat (8). The side of the movable limiting mechanism (9) is connected to an intermediate tube (10), and the other end of the intermediate tube (10) is connected to a connecting tube (11). Both ends of the connecting tube (11) are connected to a gas control mechanism (12). The gas control mechanism (12) is connected to the side of the movable seat (6) and contacts the clamping plates (4). The opposite surfaces of the two intermediate seats (8) are connected to a movable adjustment mechanism (13) arranged in the placement groove (3).

2. A composite plate shear test tool according to claim 1, characterized in that: The placement groove (3) is in communication with the two moving holes (2), the moving block (7) is slidably connected in the moving holes (2), and a limiting groove (15) is provided on the top wall of the placement groove (3) at a position corresponding to the movable limiting mechanism (9).

3. A composite plate shear test tool according to claim 2, characterized in that: The movable limiting mechanism (9) comprises an air frame (91) connected to the middle seat (8), a slide plate (92) being slidably connected inside the air frame (91), a vertical rod (93) being connected to the slide plate (92), a limiting block (95) being fixedly connected to the top end of the vertical rod (93), and the limiting block (95) being adapted to the size of the limiting groove (15).

4. A composite plate shear test tool according to claim 3, characterized in that: The side surface of the air frame (91) is in communication with an intermediate tube (10) penetrating and connected in the intermediate seat (8); the intermediate tube (10) is penetrating and connected on the tooling seat (1); a guide sleeve (94) is penetrating and connected on the air frame (91); and the vertical rod (93) is slidably connected in the guide sleeve (94).

5. The composite plate shear test tool according to claim 1, characterized in that: The gas control mechanism (12) comprises a piston frame (121) connected to the side of the movable seat (6); a piston plate (122) is slidably connected inside the piston frame (121); a contact rod (123) is connected to the side of the piston plate (122); the other end of the contact rod (123) is in contact with the clamping plate (4); a connecting sleeve (124) is slidably connected to the outside of the contact rod (123); the connecting sleeve (124) penetrates and is connected to the side of the piston frame (121); an elastic component (125) connected to the piston plate (122) and the inner wall of the piston frame (121) is provided on the outer sleeve of the contact rod (123); and the piston frame (121) is connected to the connecting pipe (11).

6. A composite plate shear test tool according to claim 1, characterized in that: The movable adjustment mechanism (13) comprises a connecting frame (131) and a transfer box (132), wherein the connecting frame (131) and the transfer box (132) are fixedly connected in the placement groove (3), and two transverse plates (133) are slidably connected in the connecting frame (131), and a transverse rod (134) is fixedly connected to one side of the transverse plate (133) close to the middle seat (8), and the transverse rod (134) passes through and is slidably connected to the side of the connecting frame (131).

7. A composite plate shear test tool according to claim 6, characterized in that: One end of the cross bar (134) located outside the connection frame (131) is fixedly connected to the middle seat (8); two gas filling pipes (135) are provided outside the transfer box (132); the other ends of the gas filling pipes (135) are connected to the connection frame (131); the back side of the transfer box (132) is connected to an air inlet pipe (136); the air inlet pipe (136) is connected through the tooling seat (1); the connection frame (131) is connected to an air outlet pipe (137); the air outlet pipe (137) is connected to the air outlet head (14); and the air outlet pipe (137) is connected to a portion of the connection frame (131) located between the two cross plates (133).

8. A test method for a composite plate shear test fixture, according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: First, the tooling is assembled onto the experimental device, and then the composite board to be tested is placed between the two clamping plates (4), and gas is injected into the transfer box (132) through the air inlet pipe (136). The gas in the transfer box (132) enters the connection frame (131) through the gas filling pipe (135). The air pressure in the connection frame (131) increases while controlling the cross plate (133), the cross bar (134) and the middle seat (8) to move closer to the composite board until one of the clamping plates (4) contacts the composite board. The cross bar (134) is blocked by the composite board, and the other clamping plate (4) continues to move until both clamping plates (4) contact the composite board. Since the air pressure controlling the movement of the cross plate (133) acts on the two clamping plates (4) at the same time, the forces applied by the clamping plates (4) and the composite board are the same. At this time, the control driving component (5) works, and the driving component (5) controls the clamping plate (4) to move to clamp the composite board, and the clamping plate (4) moves away from the contact rod (123); The elastic component (125) controls the movement of the piston plate (122), and the gas in the piston plate (122) is transferred to the air frame (91). The air pressure in the air frame (91) controls the slide plate (92) and the limit block (95) to move upward. The limit block (95) is inserted into the limit groove (15) to limit the movable seat (6) and the driving component (5). When the driving component (5) clamps the composite plate through the clamping plate (4), the same force is applied. When the two horizontal plates (133) approach each other, the gas in the connecting frame (131) is squeezed and discharged through the air outlet pipe (137) and the air outlet head (14). The discharged gas is blown onto the surface of the composite plate to clean the composite plate to a certain extent, thereby ensuring that the clamping surface of the composite plate is not affected by debris. Then, shear force can be applied to both sides of the composite plate through the experimental device to carry out a shear test.

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