Tensile testing equipment for a high-performance bamboo-wood composite board

Abstract

The present invention relates to the field of stress detection technology, and in particular to a tensile testing device for a high-performance bamboo-wood composite board, comprising a testing frame, a power part and two clamps; the two clamps are respectively used to clamp the upper and lower ends of a vertically arranged clamping specimen, and the clamp comprises a base, a locking part and two groups of positive clamps and two groups of side clamps installed in the base; the positive clamps and the side clamps are both matched with the base through inclined surfaces; the two groups of positive clamps are respectively located on both sides of the specimen in a thickness direction, and the two groups of side clamps are respectively located on both sides of the specimen in a width direction; the positive clamps and the side clamps clamp the specimen in different directions respectively, and the two groups of side clamps work together to limit the expansion space of the specimen in its width direction, thereby limiting the deformation of the specimen in its width direction, so that the specimen maintains its original shape as much as possible, and improves the clamping force on the specimen, prevents slipping, and prevents the specimen from breaking at the clamping position.

Description

Technical Field

[0001] The invention relates to the technical field of stress measurement, and in particular to a tensile testing device for a high-performance bamboo-wood composite board. Background Art

[0002] Bamboo-wood composite panels are usually made by combining bamboo fibers with wood fibers or wood materials through a specific process to form a composite material with high strength, durability, and environmental protection. It combines the advantages of bamboo and wood and is widely used in many fields, such as construction and decoration, furniture manufacturing, handicrafts, etc. It has excellent compression, tension, and bending resistance. During the processing or before application, in order to ensure that it can meet the needs of the use scenario, it is also necessary to sample it for tensile testing to obtain its tensile strength after processing. However, since the elastic modulus of bamboo and wood is much smaller than that of ordinary steel, it will produce a large deformation when the clamp is clamped, resulting in insufficient friction between the clamp and the sample, which may cause the clamp to slip, thereby affecting the accuracy of the measurement results. For materials such as bamboo and wood that are relatively easy to deform, the slip phenomenon may be more obvious, resulting in local deformation of the sample at the clamping point, which in turn affects the stress condition and measurement data of the entire sample. The clamping reliability of the clamp also directly affects the fracture position of the sample and the discreteness of the data. If the clamp cannot reliably clamp the bamboo and wood sample, it may cause the sample to break at the clamping point, making the measurement data inaccurate and increasing the discreteness. Summary of the invention

[0003] The invention provides a high-performance tensile testing device for bamboo-wood composite boards, so as to solve the problem that the clamping position of bamboo-wood samples is easily deformed during testing, thus affecting the test results.

[0004] The tensile testing device for a high-performance bamboo-wood composite board of the present invention adopts the following technical solution:

[0005] A tensile testing device for high-performance bamboo-wood composite boards, which is used to test specimens, includes a testing frame, a power component and two clamps; the two clamps are respectively used to clamp the upper and lower ends of the vertically arranged specimens to be clamped. The clamp includes a base, a locking component and two groups of positive clamping blocks and two groups of side clamping blocks installed in the base; the base of the clamp located below is installed on the testing frame, and the base of the clamp located above moves up and down under the drive of the power component; the two groups of positive clamping blocks are distributed along the first direction, and are respectively located on both sides of the specimen, and are both in inclined surface fit with the base; the two groups of side clamping blocks are distributed along the second direction, and are respectively located on both sides of the positive clamping blocks in the second direction, and are both in inclined surface fit with the base; an elastic component is arranged between the side clamping block and the base, and the elastic component urges the two side clamping blocks to approach each other and clamp the specimen along the second direction under the inclined surface fit with the base; the first direction and the second direction are perpendicular and both are horizontal directions, and the inclined surfaces of the base cooperating with the positive clamping blocks and the side clamping blocks gradually approach the vertical axis of the specimen from the end of the specimen to the center direction of the specimen; the width of each group of positive clamping blocks in the second direction is adjustable, and shortens when the two groups of side clamping blocks approach each other; the locking component urges the two groups of positive clamping blocks to approach each other and clamp the specimen in the first direction.

[0006] Optionally, the positive clamping block includes a connecting block and two sliding blocks. The two sliding blocks are arranged in sequence and symmetrically along the second direction. The sides of the two sliding blocks away from the specimen in the first direction are in inclined surface fit with the base; the connecting block is arranged between the two sliding blocks and is located on the side of the two sliding blocks close to the specimen, and is coplanar with the surfaces of the two sliding blocks close to the specimen; the connecting block and the two sliding blocks are in sliding fit along the inclined direction, so as to block the gap between the two sliding blocks when the two sliding blocks move away from each other.

[0007] Optionally, the side clamping block includes a clamping plate and a wedge block. The clamping plate and the wedge block are arranged in sequence along the second direction, and the clamping plate is located on the side of the wedge block close to the specimen; the clamping plate is slidably connected to the two sliding blocks on the same side of the two positive clamping blocks along the first direction and can move up and down synchronously with the sliding blocks; the clamping plate is in fit with the wedge block and can move up and down relative to the wedge block within a preset range; the side of the wedge block away from the clamping plate in the second direction is in inclined surface fit with the base.

[0008] Optionally, at least two limiting sliders located on the same horizontal plane are arranged on the surface of the clamping plate close to the sliding block, and limiting sliding grooves along the first direction are opened on the surface of the sliding block close to the clamping plate. The at least two limiting sliders located on the same horizontal plane are respectively in sliding fit with the limiting sliding grooves on the two sliding blocks on the same side.

[0009] Optionally, a vertical moving groove is opened on the surface of the wedge block close to the clamping plate, and a convex block is arranged on the surface of the clamping plate close to the wedge block. The convex block is in up and down sliding fit with the moving groove, and the moving groove limits the extreme position of the up and down movement of the clamping plate relative to the wedge block.

[0010] Optionally, the connecting block and the sliding block are slidably connected through a T-shaped groove so as to always remain connected to the sliding block when the two sliding blocks move.

[0011] Optionally, the elastic member is a spring arranged in the vertical direction, and connects the connecting wedge block and the base, and urges the wedge block to move in the vertical direction towards the center of the test piece.

[0012] Optionally, the locking member includes a top pressing plate and a stud. The top pressing plate is slidably mounted on the base in the vertical direction and is located on the side of the positive clamping block away from the center of the test piece in the vertical direction; the stud is located on the side of the top pressing plate away from the positive clamping block in the vertical direction. The stud is vertically arranged and threadedly engaged with the base. When the stud rotates, it moves up and down relative to the base, and can push the two groups of positive clamping blocks to move in the vertical direction through the top pressing plate, and then approach and clamp the test piece in cooperation with the inclined surface of the base.

[0013] Optionally, a plurality of vertically extending mounting posts are arranged on the side of the top pressing plate away from the positive clamping block, and a plurality of vertical mounting holes are arranged in the base, and each mounting post is correspondingly slidably mounted in a mounting hole.

[0014] Optionally, a control panel is arranged on the test rack, and the control panel is used to control the power member to apply a tensile force to the fixture located above.

[0015] The beneficial effects of the present invention are as follows: The positive clamping blocks and the side clamping blocks of the tensile testing device for high-performance bamboo-wood composite boards of the present invention clamp the test piece in different directions respectively. The two groups of side clamping blocks act together to limit the expansion space of the test piece in the second direction, thereby restricting the deformation of the test piece in the second direction, so that the test piece can maintain its original shape as much as possible, and improve the clamping force on the test piece, prevent slipping, and prevent the test piece from breaking at the clamping position.

[0016] Furthermore, the side clamping block can also keep the test piece in the vertical direction, so that the test piece can be applied with a tensile force along its own extension direction, ensuring the accuracy of the measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a tensile testing device for high-performance bamboo-wood composite boards of the present invention;

[0019] Figure 2Schematic diagram of the structure of the fixture in the embodiment of the tensile testing device for a high-performance bamboo-wood composite board of the present invention;

[0020] Figure 3 Schematic cross-sectional view of the fixture in the embodiment of the tensile testing device for a high-performance bamboo-wood composite board of the present invention;

[0021] Figure 4 Another cross-sectional view of the fixture in the embodiment of the tensile testing device for a high-performance bamboo-wood composite board of the present invention in another direction;

[0022] Figure 5 Schematic diagram of the disassembly of the internal structure of the fixture in the embodiment of the tensile testing device for a high-performance bamboo-wood composite board of the present invention.

[0023] In the figure: 100, testing frame; 200, control panel; 300, power component; 400, fixture; 410, base; 420, locking component; 421, top pressing plate; 422, stud; 423, mounting column; 430, positive clamping block; 431, connecting block; 432, sliding block; 433, limiting sliding groove; 440, side clamping block; 441, clamping plate; 442, wedge block; 443, limiting sliding block; 444, movable groove; 445, convex block; 450, elastic component; 500, test piece. Detailed implementation manners

[0024] 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 of 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 shall fall within the protection scope of the present invention.

[0025] An embodiment of the tensile testing device for a high-performance bamboo-wood composite board of the present invention is used to test the test piece 500, as Figures 1 to 5 shown, and includes a testing frame 100, a power component 300 and two fixtures 400.

[0026] The two fixtures 400 are respectively used to clamp the upper and lower ends of the vertically arranged test piece 500 for clamping, and are symmetrically arranged up and down.

[0027] The fixture 400 includes a base 410, a locking component 420 and two groups of positive clamping blocks 430 and two groups of side clamping blocks 440 installed in the base 410; the base 410 of the fixture 400 located below is installed on the testing frame 100, and the base 410 of the fixture 400 located above moves up and down under the drive of the power component 300, so as to perform a tensile test on the test piece 500.

[0028] The two groups of positive clamping blocks 430 are distributed along the first direction and are respectively located on two sides of the test piece 500 , and both are matched with the base 410 through an inclined surface.

[0029] The two groups of side clamping blocks 440 are distributed along the second direction and are respectively located on both sides of the positive clamping block 430 in the second direction, and are both matched with the base 410 through the inclined surface; an elastic member 450 is arranged between the side clamping blocks 440 and the base 410, and the elastic member 450 prompts the two side clamping blocks 440 to approach each other along the second direction to clamp the specimen 500 in cooperation with the inclined surface of the base 410.

[0030] The first direction is perpendicular to the second direction and both are horizontal directions. The inclined surfaces of the base 410, the front clamp 430 and the side clamp 440 gradually approach the vertical axis of the specimen 500 from the end of the specimen 500 to the center of the specimen 500 in the vertical direction; wherein the first direction is the thickness direction of the specimen 500, and the second direction is the width direction of the specimen 500.

[0031] The width of each group of positive clamping blocks 430 in the second direction is adjustable, and shortened when the two groups of side clamping blocks 440 approach each other; the locking member 420 forces the two groups of positive clamping blocks 430 to approach each other in the first direction to clamp the test piece 500.

[0032] The front clamp 430 and the side clamp 440 clamp the specimen 500 in different directions respectively, and the two groups of side clamps 440 work together to limit the expansion space of the specimen 500 in the second direction, thereby limiting the deformation of the specimen 500 in the second direction, so that the specimen 500 can maintain its original shape as much as possible, and improve the clamping force on the specimen 500, prevent slipping, and prevent the specimen 500 from breaking at the clamping position.

[0033] Furthermore, the side clamping block 440 can also keep the test piece 500 in a vertical direction, so that tension can be applied to the test piece 500 along its own extension direction, thereby ensuring the accuracy of the measurement result.

[0034] In this embodiment, the positive clamping block 430 includes a connecting block 431 and two sliding blocks 432. The two sliding blocks 432 are arranged in sequence and symmetrically along the second direction. The sides of the two sliding blocks 432 away from the test piece 500 in the first direction are in contact with the base 410 through inclined surfaces. The connecting block 431 is arranged between the two sliding blocks 432 and is located on the side of the two sliding blocks 432 close to the test piece 500, and is coplanar with the surfaces of the two sliding blocks 432 close to the test piece 500; the connecting block 431 is slidably engaged with the two sliding blocks 432 along the inclined direction, so as to block the gap between the two sliding blocks 432 when the two sliding blocks 432 move away from each other. Specifically, the connecting block 431 and the sliding block 432 are slidably connected through a T-shaped groove, so as to always be connected to the sliding block 432 when the two sliding blocks 432 move, and when the two sliding blocks 432 move away from each other, the connecting block 431 will move in the vertical direction under the sliding cooperation with the sliding block 432. When the two sliding blocks 432 of the same positive clamping block 430 are in contact, the width of the positive clamping block 430 in the second direction is in the minimum state. At this time, the end surface of the connecting block 431 away from the center of the test piece 500 in the vertical direction does not exceed the end surface of the sliding block 432, and the width of the test piece 500 clamped by the positive clamping block 430 in the second direction is not less than the minimum width of the positive clamping block 430, so as to ensure the clamping effect of the side clamping block 440 on the test piece 500.

[0035] In this embodiment, the side clamping block 440 includes a clamping plate 441 and a wedge block 442. The clamping plate 441 and the wedge block 442 are arranged in sequence along the second direction, and the clamping plate 441 is located on the side of the wedge block 442 close to the test piece 500; the clamping plate 441 is slidably connected to the two sliding blocks 432 on the same side of the two positive clamping blocks 430 along the first direction, and can move up and down synchronously with the sliding blocks 432. The end surface of the clamping plate 441 close to the center of the test piece 500 in the vertical direction is flush with the end surface of the sliding block 432. The clamping plate 441 is in contact with the wedge block 442 and can move up and down relative to the wedge block 442 within a preset range; the surface of the wedge block 442 away from the clamping plate 441 in the second direction is in contact with the base 410 through an inclined surface. The elastic member 450 is a spring arranged along the vertical direction, and is connected to the wedge block 442 and the base 410, and urges the wedge block 442 to move in the vertical direction towards the direction close to the center of the test piece 500, so that the wedge blocks 442 of the two side clamping blocks 440 approach each other under the cooperation of the inclined surface with the base 410, thereby clamping the two sides of the test piece 500 in the second direction by the two clamping plates 441. In the initial state, the two wedge blocks 442 are in the state with the closest distance under the action of the elastic member 450 and the inclined surface cooperating with the base 410. At this time, the distance between the two wedge blocks 442 in the second direction is the maximum width of the test piece 500 to be measured, and the distance between the two clamping plates 441 in the second direction is the minimum width of the test piece 500 to be measured. By setting the clamping plate 441 with a certain thickness, test pieces 500 with different width ranges can be adapted.

[0036] In this embodiment, at least two limiting sliders 443 located on the same horizontal plane are provided on one side of the clamping plate 441 close to the sliding block 432. A limiting chute 433 extending in the first direction is formed on one side of the sliding block 432 close to the clamping plate 441. The at least two limiting sliders 443 located on the same horizontal plane are respectively in sliding fit with the limiting chutes 433 on two sliding blocks 432 on the same side, so that the clamping plate 441 can move up and down synchronously with the sliding block 432. The portion of the clamping plate 441 between at least two limiting sliders 443 located on the same horizontal plane is used to abut against the specimen 500.

[0037] In this embodiment, a vertically extending movable groove 444 is formed on one side of the wedge block 442 close to the clamping plate 441. A convex block 445 is provided on one side of the clamping plate 441 close to the wedge block 442. The convex block 445 is in vertical sliding fit with the movable groove 444. The movable groove 444 limits the extreme positions of the clamping plate 441 moving up and down relative to the wedge block 442, and when installing the specimen 500, enables the wedge block 442 to move synchronously with the convex block 445 in a direction away from the center of the specimen 500, so as to separate the two sliding blocks 432 of the positive clamping block 430. Among them, the cooperation between the limiting slider 443 and the limiting chute 433, and the cooperation between the convex block 445 and the movable groove 444 enable the wedge block 442, the clamping plate 441 and the sliding block 432 to move synchronously in the second direction, so that when the two wedge blocks 442 move away from each other, the two sliding blocks 432 of the same positive clamping block 430 can be driven to move away from each other, thereby increasing the width of the positive clamping block 430 in the second direction.

[0038] In this embodiment, the locking member 420 includes a top pressing plate 421 and a stud 422. The top pressing plate 421 is slidably installed on the base 410 in the vertical direction and is located on the side of the positive clamping block 430 away from the center of the specimen 500 in the vertical direction. The stud 422 is located on the side of the top pressing plate 421 away from the positive clamping block 430 in the vertical direction. The stud 422 is vertically arranged and is in threaded fit with the base 410. When the stud 422 rotates, it moves up and down relative to the base 410, and can push the two groups of positive clamping blocks 430 to move in the vertical direction through the top pressing plate 421, so as to approach and clamp the specimen 500 in cooperation with the inclined surface of the base 410. Specifically, a plurality of vertically extending mounting posts 423 are provided on the side of the top pressing plate 421 away from the positive clamping block 430. A plurality of vertical mounting holes are provided in the base 410, and each mounting post 423 is correspondingly slidably installed in one mounting hole.

[0039] In this embodiment, a control panel 200 is provided on the detection rack 100. The control panel 200 is used to control the power member 300 to apply a tensile force to the fixture 400 located above. Among them, the power member 300 includes a lifting frame and a power assembly for controlling the up and down movement of the lifting frame. The lifting frame is slidably mounted on the detection rack 100 up and down. The power assembly is a motor and a lead screw. The lead screw is in threaded cooperation with the lifting frame and rotates under the drive of the motor to drive the lifting frame to move up and down. In some other embodiments, the power assembly can also be a linear motor or a hydraulic cylinder.

[0040] In the initial state of a tensile testing device for a high-performance bamboo-wood composite board according to the present invention, the wedge blocks 442 of each fixture 400 move in the vertical direction towards the center of the test piece 500 under the action of the elastic member 450, and the two wedge blocks 442 of the same fixture 400 approach each other under the cooperation with the inclined surface of the base 410, and the distance between the two wedge blocks 442 is in the minimum state. The two positive clamping blocks 430 of the fixture 400 located above tend to move downward under the action of gravity and approach each other under the cooperation with the inclined surface of the base 410, and the distance between the positive clamping blocks 430 in the first direction is in the minimum state. The two positive clamping blocks 430 of the fixture 400 located below tend to move downward under the action of gravity. Since the two fixtures 400 are symmetrically arranged up and down, the two positive clamping blocks 430 of the fixture 400 located below are not restricted by the inclined surface of the base 410 and have a certain distance in the first direction.

[0041] When installing the test piece 500, first, the installation of the lower end of the test piece 500 and the fixture 400 below it will be described. The lower end of the test piece 500 presses against the positive clamping block 430 and the clamping plate 441 of the fixture 400 below, and pushes the positive clamping block 430 and the clamping plate 441 downward until the clamping plate 441 moves to the lower side of the convex block 445 and the movable groove 444 to abut. The clamping plate 441 drives the wedge block 442 to move downward synchronously, further compressing the elastic member 450. And the two wedge blocks 442 move away from each other under the action of the inclined surfaces cooperating with the base 410, thereby driving the two sliding blocks 432 of the same positive clamping block 430 to move away from each other, and the width of the positive clamping block 430 in the second direction increases until the lower end of the test piece 500 is inserted between the two groups of positive clamping blocks 430. After that, the wedge block 442 moves upward and resets under the action of the elastic member 450, and the two wedge blocks 442 approach each other and clamp the two sides of the lower end of the test piece 500 in the second direction through the two clamping plates 441. Finally, rotate the stud 422 so that the top pressing plate 421 pushes the two groups of positive clamping blocks 430 upward. The two groups of positive clamping blocks 430 approach each other under the cooperation of the inclined surfaces with the base 410 and clamp the two sides of the lower end of the test piece 500 in the first direction. When clamping the upper end of the test piece 500, the power member 300 drives the fixture 400 above to move downward, so that the upper end of the test piece 500 presses against the positive clamping block 430 and the clamping plate 441 of the fixture 400 above. The fixture 400 above continues to move downward, so that the upper end of the test piece 500 pushes the positive clamping block 430 and the clamping plate 441 until the two wedge blocks 442 move upward and away from each other, and the two sliding blocks 432 of the same positive clamping block 430 move away from each other, and the width of the positive clamping block 430 in the second direction increases, and the upper end of the test piece 500 is inserted between the two groups of positive clamping blocks 430. After that, the two wedge blocks 442 reset and clamp the two sides of the upper end of the test piece 500 in the second direction through the two clamping plates 441, and rotate the stud 422 to make the top pressing plate 421 push the two groups of positive clamping blocks 430 downward, and the two groups of positive clamping blocks 430 approach each other and clamp the two sides of the upper end of the test piece 500 in the first direction.

[0042] After the two ends of the test piece 500 are clamped, the power member 300 drives the fixture 400 above to move upward to stretch the test piece 500. During the stretching process, the positive clamping blocks 430 and the side clamping blocks 440 of the two fixtures 400 further clamp the test piece 500 under the cooperation of the inclined surfaces with the base 410. The side clamping blocks 440 and the positive clamping blocks 430 jointly act to clamp the test piece 500, which can reduce the deformation of the clamping position of the test piece 500 during the stretching process, prevent the clamping position from breaking, and ensure the accuracy of the measurement results.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tensile testing device for high-performance bamboo-wood composite boards, which is used to test specimens, and is characterized in that: It includes a detection rack, a power component and two jigs; The two jigs are respectively used for clamping the upper and lower ends of a vertically arranged clamped specimen; The jig includes a base, a locking member and two groups of positive clamping blocks and two groups of side clamping blocks installed in the base; The base of the lower jig is installed on the detection rack, and the base of the upper jig moves up and down under the drive of the power component; The two groups of positive clamping blocks are distributed along a first direction, and are respectively located on both sides of the specimen, and are both in inclined surface fit with the base; The two groups of side clamping blocks are distributed along a second direction, and are respectively located on both sides of the positive clamping blocks in the second direction, and are both in inclined surface fit with the base; an elastic member is arranged between the side clamping block and the base, and the elastic member urges the two side clamping blocks to approach each other along the second direction and clamp the specimen under the inclined surface fit with the base; The first direction and the second direction are perpendicular and both are horizontal directions, and the inclined surfaces of the base cooperating with the positive clamping blocks and the side clamping blocks gradually approach the vertical axis of the specimen from the end of the specimen towards the center of the specimen; The width of each group of positive clamping blocks in the second direction is adjustable and shortens when the two groups of side clamping blocks approach each other; the locking member urges the two groups of positive clamping blocks to approach each other along the first direction and clamp the specimen; The positive clamping block includes a connecting block and two sliding blocks, the two sliding blocks are arranged in sequence and symmetrically along the second direction, and the sides of the two sliding blocks away from the specimen in the first direction are in inclined surface fit with the base; the connecting block is arranged between the two sliding blocks and is located on the side of the two sliding blocks close to the specimen, and is coplanar with the surfaces of the two sliding blocks close to the specimen; the connecting block and the two sliding blocks are in sliding fit along an inclined direction, so as to block the gap between the two sliding blocks when the two sliding blocks move away from each other.

2. The tensile testing device for a high-performance bamboo-wood composite board according to claim 1, characterized in that: The side clamping block includes a clamping plate and a wedge block, the clamping plate and the wedge block are arranged in sequence along the second direction, and the clamping plate is located on the side of the wedge block close to the specimen; The clamping plate is slidably connected to the two sliding blocks on the same side of the two positive clamping blocks along the first direction and can move up and down synchronously with the sliding blocks; the clamping plate is in contact with the wedge block and can move up and down relative to the wedge block within a preset range; the surface of the wedge block away from the clamping plate in the second direction is in inclined surface fit with the base.

3. The tensile testing device for a high-performance bamboo-wood composite board according to claim 2, characterized in that: At least two limiting sliders located on the same horizontal plane are arranged on the surface of the clamping plate close to the sliding block, and limiting chutes along the first direction are formed on the surface of the sliding block close to the clamping plate, and at least two limiting sliders located on the same horizontal plane are respectively in sliding fit with the limiting chutes on the two sliding blocks on the same side.

4. The tensile testing device for a high-performance bamboo-wood composite board according to claim 2, characterized in that: An activity groove in the vertical direction is formed on the surface of the wedge block close to the clamping plate, and a convex block is arranged on the surface of the clamping plate close to the wedge block, and the convex block is in up and down sliding fit with the activity groove, and the activity groove limits the limit position of the clamping plate moving up and down relative to the wedge block.

5. The tensile testing device for a high-performance bamboo-wood composite board according to claim 1, characterized in that: The connecting block and the sliding block are slidably connected through a T-shaped groove so as to always be connected to the sliding block when the two sliding blocks move.

6. The tensile testing device for a high-performance bamboo-wood composite board according to claim 2, characterized in that: The elastic member is a spring arranged in the vertical direction, and is connected to the wedge block and the base, and urges the wedge block to move in the direction close to the center of the specimen along the vertical direction.

7. The tensile testing device for a high-performance bamboo-wood composite board according to claim 1, characterized in that: The locking member includes a top pressing plate and a stud. The top pressing plate is slidably mounted on the base in the vertical direction and is located on the side of the positive clamping block that is away from the center of the test piece in the vertical direction. The stud is located on the side of the top pressing plate that is away from the positive clamping block in the vertical direction. The stud is vertically arranged and is in threaded cooperation with the base. When the stud rotates, it moves up and down relative to the base, and can push the two groups of positive clamping blocks to move in the vertical direction through the top pressing plate, and then approach and clamp the test piece in cooperation with the inclined surface of the base.

8. The tensile testing device for a high-performance bamboo-wood composite board according to claim 7, characterized in that: A plurality of vertically extending mounting posts are provided on the side of the top pressing plate away from the positive clamping block, and a plurality of vertical mounting holes are provided in the base. Each mounting post is correspondingly slidably mounted in a mounting hole.

9. The tensile testing device for a high-performance bamboo-wood composite board according to claim 1, wherein: A control panel is provided on the test rack, and the control panel is used to control the power member to apply a pulling force to the fixture located above.

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