Plywood performance detection device

Abstract

The invention relates to the technical field of plywood performance detection, in particular to a plywood performance detection device which comprises a base, a clamping mechanism for clamping plywood is arranged on the upper surface of the base, a first hydraulic telescopic cylinder is fixedly installed in the center of the upper surface of the base, and a linkage ring is fixedly connected to the top end of the first hydraulic telescopic cylinder. The detection device further comprises a detection mechanism used for detecting the performance of the plywood. The detection mechanism is arranged on the linkage ring, the detection mechanism comprises a pressurizing part which is arranged on the linkage ring and is used for adjusting the detection pressure, an auxiliary part for performing circumferential detection is arranged on the pressurizing part, and the detection mechanism is matched with the clamping mechanism to detect a plurality of samples at the same time; and different properties of a plurality of samples can be detected at the same time, so that the detection selection is more diversified, the detection convenience degree is improved, and the detection efficiency can be improved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of plywood performance detection, and specifically provides a plywood performance detection device. Background Art

[0002] Plywood is a three-layer or multi-layer plate material made by slicing wood segments into veneers or planing wooden squares into thin woods and then gluing them with adhesives. Usually, an odd number of veneers are used, and the fiber directions of adjacent veneers are glued perpendicular to each other. Plywood can be applied in various fields. When plywood is used as a floor, it is necessary to conduct surface scratch tests and surface wear resistance tests on the plywood to ensure that the quality of the plywood floor meets the usage requirements.

[0003] When conducting surface scratch tests and surface wear resistance tests on plywood, usually a single detection device is used to detect the plywood during these two performance detections. When conducting batch detections, the detection efficiency is not high; since the surface of plywood will encounter different wear or scratch situations when used as a floor, the existing detection methods usually use a single detection condition to detect the plywood, resulting in the detection results not being in line with the actual usage situation, which affects the subsequent judgment of the quality of the plywood. Summary of the Invention

[0004] Therefore, the present invention provides a plywood performance detection device to solve the above technical problems.

[0005] A plywood performance detection device provided by the present invention includes a base. A clamping mechanism for clamping plywood is arranged on the upper surface of the base. First hydraulic telescopic cylinders are fixedly installed at the four corners of the upper surface of the base. The tops of the four first hydraulic telescopic cylinders are fixedly connected to a linkage ring together. The detection device further includes a detection mechanism for performing performance detection on the plywood; the detection mechanism is arranged on the linkage ring.

[0006] The detection mechanism includes a pressing member arranged on the linkage ring for adjusting the detection pressure. An auxiliary member for performing circumferential detection is arranged on the pressing member. An adjusting member for adjusting the detection head is arranged on the auxiliary member.

[0007] The adjusting member includes a portal-shaped connecting frame fixedly connected to the auxiliary member. An adjusting disc is rotatably connected inside the portal-shaped connecting frame. A plurality of different types of detection heads are inserted on the circumferential surface of the adjusting disc. A limiting screw is inserted between the portal-shaped connecting frame and the adjusting disc together.

[0008] According to an embodiment of the present invention, limiting through holes similar to the limiting screw are arranged on both the portal-shaped connecting frame and the adjusting disc, and the positions of the limiting through holes correspond to the positions of the detection heads.

[0009] According to an embodiment of the present invention, the pressing member includes a plurality of mounting plates fixedly connected to the linkage ring. A sliding seat is slidably connected to the upper surface of the mounting plate. A second driving motor is fixedly connected to a section of the lower surface of the mounting plate away from the center of the base. The output end of the second driving motor is fixedly connected to a threaded rod.

[0010] According to an embodiment of the present invention, a section of the threaded rod close to the center of the base is rotatably connected to the lower surface of the mounting plate through a bearing seat. The threaded rod penetrates through the bottom end of the sliding seat and is threadedly connected to the sliding seat.

[0011] According to an embodiment of the present invention, the auxiliary member includes a first driving motor fixedly connected to the pressing member through a motor seat. A limit pin rod is inserted into the top end of the motor seat. The output end of the first driving motor is fixedly connected to a mounting disc. Connecting ears are fixedly connected to the circumferential surface of the mounting disc.

[0012] According to an embodiment of the present invention, a jack matching the size of the limit pin rod is provided on the connecting ear. A section of the limit pin rod close to the center of the base is inserted and matched with the jack.

[0013] According to an embodiment of the present invention, the clamping mechanism includes a second hydraulic telescopic cylinder arranged at the center position of the upper surface of the base. The telescopic end of the second hydraulic telescopic cylinder is fixedly connected to a linkage frame. A second clamping member for internally supporting the test sample is arranged on the upper surface of the base and inside the linkage frame. A first clamping member for externally clamping the test sample is arranged on the upper surface of the base and between the linkage frame and the second clamping member.

[0014] According to an embodiment of the present invention, the first clamping member includes four support vertical rods fixedly connected to the upper surface of the base and distributed in a circumferential array. A pulling frame is slidably connected up and down on the support vertical rods. Two limit sliding rods are penetrated and slidably connected in a vertically uniform distribution on a surface of the support vertical rod close to the center of the base. The two limit sliding rods are fixedly connected together at one end close to the center of the base. A clamping seat is fixedly connected to a surface of the clamping seat away from the center of the base. A top rod is fixedly connected to a section of the top rod away from the clamping seat. The section of the top rod away from the clamping seat penetrates and is slidably connected on the support vertical rod.

[0015] According to an embodiment of the present invention, a bevel block gradually thickening from top to bottom is arranged on a section of the top rod away from the clamping seat. An auxiliary roller for facilitating the relative sliding between the pulling frame and the bevel surface of the bevel block is arranged at a position corresponding to the bevel block on the pulling frame.

[0016] According to an embodiment of the present invention, the second clamping member includes four support legs fixedly connected to the upper surface of the base in a circumferential array. A fixing shell is fixedly connected to the inside of the four support legs. Arc-shaped blocks are slidably connected to the four vertical inner walls of the fixing shell through connecting columns. The connecting columns on each arc-shaped block penetrate to the outside of the fixing shell and are fixedly connected to an extrusion plate together. A pull rod penetrates through the bottom inner wall of the fixing shell up and down and is slidably connected. The top of the pull rod is spherical, and the top of the pull rod is slidably matched with the arc surface of the arc-shaped block.

[0017] Applying the technical solution of the present invention: 1. The detection mechanism and the clamping mechanism can be used to detect multiple samples simultaneously, and different types of detection heads can be used to detect surface scratches and wear resistance at the same time, improving the applicability of the detection equipment. And when performing batch detection, the detection efficiency of the detection equipment is improved.

[0018] 2. By detecting multiple samples simultaneously at one time, and different detection conditions (different movement directions, different detection heads, different detection pressures and other different detection conditions) can be selected and combined according to needs, so that more diverse detection results can be obtained. The detection conditions are more in line with the actual use situation, making the obtained detection results more in line with the true quality results of the plywood, which is convenient for subsequent staff to judge the quality of the plywood. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0020] Figure 1 is a three-dimensional structural schematic diagram of the plywood performance detection device provided by the present invention.

[0021] Figure 2 is a three-dimensional structural schematic diagram of the distribution of the first hydraulic telescopic cylinder provided by the present invention.

[0022] Figure 3 is a three-dimensional structural schematic diagram of the clamping mechanism provided by the present invention.

[0023] Figure 4 is a three-dimensional structural schematic diagram of the first clamping member provided by the present invention.

[0024] Figure 5 is provided by the present invention Figure 4 The enlarged view of part A in

[0025] Figure 6 This is a three-dimensional structural schematic diagram of the second clamping member provided by the present invention.

[0026] Figure 7 This is a sectional schematic diagram of the fixed shell provided by the present invention.

[0027] Figure 8 This is a three-dimensional structural schematic diagram of the detection mechanism provided by the present invention.

[0028] Figure 9 This is a three-dimensional structural schematic diagram of the adjusting member provided by the present invention.

[0029] Figure 10 This is a three-dimensional structural schematic diagram of the pressing member and the auxiliary member provided by the present invention.

[0030] Reference numerals: 1, base; 2, clamping mechanism; 3, linkage ring; 4, detection mechanism; 5, first hydraulic telescopic cylinder; 21, second hydraulic telescopic cylinder; 22, first clamping member; 23, second clamping member; 24, linkage frame; 41, pressing member; 42, auxiliary member; 43, adjusting member; 221, pulling frame; 222, support vertical rod; 223, limiting slide bar; 224, ejector rod; 225, clamping seat; 231, extrusion plate; 232, support leg; 233, fixed shell; 234, pulling rod; 235, arc-shaped block; 411, mounting plate; 412, sliding seat; 413, second driving motor; 414, threaded rod; 421, first driving motor; 422, limiting pin rod; 423, connecting ear; 424, mounting disc; 431, portal connecting frame; 432, adjusting disc; 434, limiting screw rod. Detailed Description of the Invention

[0031] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] As Figure 1 and Figure 2 shown, a plywood performance detection device includes a base 1. A clamping mechanism 2 for clamping plywood is provided on the upper surface of the base 1. First hydraulic telescopic cylinders 5 are fixedly installed at the four corners of the upper surface of the base 1. The tops of the four first hydraulic telescopic cylinders 5 are commonly fixedly connected to a linkage ring 3. The detection device further includes a detection mechanism 4 for performing performance detection on the plywood; the detection mechanism 4 is provided on the linkage ring 3.

[0033] As Figure 1 andFigure 3 As shown, the clamping mechanism 2 includes a second hydraulic telescopic cylinder 21 arranged at the center position of the upper surface of the base 1. The telescopic end of the second hydraulic telescopic cylinder 21 is fixedly connected with a linkage frame 24. On the upper surface of the base 1 and inside the linkage frame 24, there is a second clamping member 23 for internally supporting the test sample. On the upper surface of the base 1 and between the linkage frame 24 and the second clamping member 23, there is a first clamping member 22 for externally clamping the test sample.

[0034] As Figure 3 、 Figure 4 and Figure 5 As shown, the first clamping member 22 includes four support vertical rods 222 fixedly connected to the upper surface of the base 1 and distributed in a circumferential array. A pulling frame 221 is slidably connected up and down on the support vertical rods 222. On one side of the support vertical rods 222 close to the center of the base 1, two limit sliding rods 223 are penetrated and slidably connected, and are uniformly distributed up and down. The two limit sliding rods 223 are fixedly connected to a clamping seat 225 at one end close to the center of the base 1. On the side of the clamping seat 225 away from the center of the base 1, a top rod 224 is fixedly connected. One section of the top rod 224 away from the clamping seat 225 penetrates and is slidably connected to the support vertical rod 222. One section of the top rod 224 away from the clamping seat 225 is provided with an inclined block that gradually thickens from top to bottom. At the position corresponding to the inclined block on the pulling frame 221, there is an auxiliary roller for facilitating the relative sliding between the pulling frame 221 and the inclined surface of the inclined block.

[0035] During specific use, first, four test samples of the same size are stacked and pressed end to end on the four clamping seats 225. Then, the second hydraulic telescopic cylinder 21 contracts, driving the linkage frame 24 to move downward. The linkage frame 24 drives the four pulling frames 221 to move downward. The pulling frames 221 slide downward on the support vertical rods 222. At this time, the auxiliary rollers on the pulling frames 221 slide downward along the inclined surface of the inclined block on the top rod 224. The top rod 224 pushes the clamping seat 225 to move on the support vertical rods 222 in the direction close to the center of the base 1, clamping the four samples firmly. Through the setting of the limit sliding rods 223, the clamping seat 225 can maintain horizontal movement during the movement to ensure stable clamping of the samples.

[0036] As Figure 3 、 Figure 6 and Figure 7As shown, the second clamping member 23 includes four support legs 232 fixedly connected to the upper surface of the base 1 in a circumferential array. A fixed shell 233 is fixedly connected to the inside of the four support legs 232. Arc-shaped blocks 235 are slidably connected to the four vertical inner walls of the fixed shell 233 through connecting columns. The connecting columns on each arc-shaped block 235 penetrate to the outside of the fixed shell 233 and are fixedly connected to an extrusion plate 231 together. The bottom inner wall of the fixed shell 233 penetrates vertically and is slidably connected to a pulling rod 234. The top of the pulling rod 234 is spherical, and the top of the pulling rod 234 is in sliding fit with the arc surface of the arc-shaped block 235.

[0037] During specific use, when the linkage frame 24 drives the pulling frame 221 to move downward, the linkage frame 24 synchronously drives the pulling rod 234 to move downward. At this time, the spherical surface at the top of the pulling rod 234 slides downward along the arc surface of the arc-shaped block 235. While the pulling rod 234 slides downward, it pushes the arc-shaped block 235 to move in the direction outside the fixed shell 233 through the spherical surface at its top. The arc-shaped block 235 pushes the extrusion plate 231 closer to the sample through the connecting column on it, pressing tightly against the sample, and cooperates with the clamping seat 225 to perform synchronous inner support and outer clamping on the sample.

[0038] As Figure 1 and Figure 8 shown, the detection mechanism 4 includes a pressure applying member 41 provided on the linkage ring 3 for adjusting the detection pressure. An auxiliary member 42 for circumferential detection is provided on the pressure applying member 41. An adjusting member 43 for adjusting the detection head is provided on the auxiliary member 42.

[0039] As Figure 8 and Figure 9 shown, the adjusting member 43 includes a U-shaped connecting frame 431 fixedly connected to the auxiliary member 42. An adjusting disk 432 is rotatably connected to the inside of the U-shaped connecting frame 431. A plurality of different types of detection heads (including a detection head for detecting surface scratches, a detection head for detecting surface wear resistance, and a detection head for different surface friction coefficients) are inserted on the circumferential surface of the adjusting disk 432. A limiting screw 434 is inserted between the U-shaped connecting frame 431 and the adjusting disk 432. Limiting through holes similar to the limiting screw 434 are provided on both the U-shaped connecting frame 431 and the adjusting disk 432, and the positions of the limiting through holes correspond to the positions of the detection heads.

[0040] During specific use, when the sample is clamped, at this time, the staff first removes the limiting screw 434 from the U-shaped connecting frame 431, then rotates the adjusting disk 432 according to the detection requirements so that the required detection head on the adjusting disk 432 is aligned with the sample, and then inserts the limiting screw 434 back into the U-shaped connecting frame 431, simultaneously passing through the limiting through holes on the U-shaped connecting frame 431 and the adjusting disk 432, so that the adjusting disk 432 and the U-shaped connecting frame 431 remain relatively fixed.

[0041] As Figure 8 and Figure 10 shown, the pressing member 41 includes a plurality of mounting plates 411 fixedly connected to the linkage ring 3. A sliding seat 412 is slidably connected to the upper surface of the mounting plate 411. A second driving motor 413 is fixedly connected to a section of the lower surface of the mounting plate 411 away from the center of the base 1. The output end of the second driving motor 413 is fixedly connected to a threaded rod 414. A section of the threaded rod 414 close to the center of the base 1 is rotatably connected to the lower surface of the mounting plate 411 through a bearing seat. The threaded rod 414 penetrates through the bottom end of the sliding seat 412 and is threadedly connected to the sliding seat 412.

[0042] During specific use, after the adjustment of the detection head is completed, at this time, the second driving motor 413 rotates to drive the threaded rod 414 to rotate synchronously. During the rotation of the threaded rod 414, the sliding seat 412 is driven to move on the mounting plate 411, pushing the detection head closer to the sample, applying pressure to the detection head on the sample, and adjusting the pressure of the detection head on the sample as needed.

[0043] As Figure 8 and Figure 10 shown, the auxiliary member 42 includes a first driving motor 421 fixedly connected to the upper surface of the sliding seat 412 through a motor seat. A limit pin rod 422 is inserted into the top end of the motor seat. The output end of the first driving motor 421 is fixedly connected to a mounting disc 424. Connecting ears 423 are fixedly connected to the circumferential surface of the mounting disc 424. A jack adapted to the size of the limit pin rod 422 is provided on the connecting ear 423. A section of the limit pin rod 422 close to the center of the base 1 is inserted and matched with the jack.

[0044] During specific use, after the detection head abuts against the sample, at this time, when circumferential detection is required on the sample, first, the limit pin rod 422 connected between the motor seat and the connecting ear 423 is pulled out, and then the first driving motor 421 rotates to drive the mounting disc 424 to rotate. The mounting disc 424 drives the gantry connecting frame 431 to rotate to drive the detection head to perform a circular motion for circumferential detection on the surface of the sample piece; when linear detection is required on the sample, first, the limit pin rod 422 is re-inserted on the connecting ear 423 and the motor seat, and then the first hydraulic telescopic cylinder 5 contracts to drive the entire detection mechanism 4 to move up and down through the linkage ring 3, driving the detection head to move up and down on the surface of the sample, thereby completing linear detection of the sample.

[0045] The staff can, according to needs, select the above detection conditions for combined matching, and can also select a single detection condition for detection. During the detection process, according to the time when damage appears on the surface of the sample, combined with the detection conditions applied to the surface of the sample, a comprehensive analysis is made to obtain the performance detection result of the sample.

[0046] Working principle: In specific use, first stack and press four detection samples of the same size end to end on the first clamping member 22. The second hydraulic telescopic cylinder 21 contracts to drive the linkage frame 24 to move downward, so that the second clamping member 23 and the first clamping member 22 move synchronously to clamp the sample. Then, according to the detection requirements, first adjust the appropriate detection head through the adjusting member 43, and then push the detection head on the adjusting member 43 towards the sample by the pressing member 41 to apply pressure on the sample. The first hydraulic telescopic cylinder 5 drives the linkage ring 3 to move up and down to detect the surface scratches or surface wear resistance of the sample in the linear direction. The auxiliary member 42 drives the adjusting member 43 to rotate to detect the surface scratches or surface wear resistance of the sample in the circumferential direction. It is also possible to detect the surface scratches or surface wear resistance of the sample in the linear direction in a combination of the circumferential direction and the linear direction.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0048] In addition, the terms "first", "second", "No. 1", "No. 2" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "No. 1", "No. 2" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A plywood performance testing device, characterized in that: It comprises a base (1), the upper surface of the base (1) is provided with a clamping mechanism (2) for clamping a plywood board, first hydraulic telescopic cylinders (5) are fixedly mounted at the four upper corners of the base (1), and the top ends of the four first hydraulic telescopic cylinders (5) are commonly fixedly connected with a linkage ring (3); A testing mechanism (4) for testing the performance of plywood; the testing mechanism (4) is arranged on the linkage ring (3); The detection mechanism (4) comprises a pressure member (41) arranged on the linkage ring (3) for adjusting the detection pressure, an auxiliary member (42) for performing circumferential detection is arranged on the pressure member (41), and an adjustment member (43) for adjusting the detection head is arranged on the auxiliary member (42); The adjusting member (43) comprises a door-shaped connecting frame (431) fixedly connected to the auxiliary member (42); an adjusting disk (432) is rotatably connected to the inner side of the door-shaped connecting frame (431); a plurality of different types of detection heads are plugged into the circumferential surface of the adjusting disk (432); and a limiting screw rod (434) is plugged between the door-shaped connecting frame (431) and the adjusting disk (432).

2. A plywood performance testing device according to claim 1, characterized in that: The door-shaped connecting frame (431) and the adjusting disk (432) are both provided with limiting through holes that are similar to the limiting screw rod (434), and the positions of the limiting through holes correspond to the positions of the detection heads.

3. The plywood performance testing device according to claim 1, characterized in that: The pressure member (41) comprises a plurality of mounting plates (411) fixedly connected to the linkage ring (3); the upper surface of the mounting plate (411) is slidably connected to a sliding seat (412); a section of the lower surface of the mounting plate (411) away from the center of the base (1) is fixedly connected to a second drive motor (413); and the output end of the second drive motor (413) is fixedly connected to a threaded rod (414).

4. A plywood performance testing device according to claim 3, characterized in that: A section of the threaded rod (414) close to the center of the base (1) is rotatably connected to the lower surface of the mounting plate (411) via a bearing seat, and the threaded rod (414) passes through the bottom end of the sliding seat (412) and is threadedly connected to the sliding seat (412).

5. The plywood performance testing device according to claim 1, characterized in that: The auxiliary component (42) comprises a first drive motor (421) fixedly connected to the pressure component (41) via a motor seat, a limit pin (422) being inserted into the top end of the motor seat, an output end of the first drive motor (421) being fixedly connected to a mounting plate (424), and a connecting ear (423) being fixedly connected to the circumferential surface of the mounting plate (424).

6. A plywood performance testing device according to claim 5, characterized in that: The connecting ear (423) is provided with a socket that matches the size of the limiting pin rod (422), and a section of the limiting pin rod (422) close to the center of the base (1) is plugged into and matched with the socket.

7. The plywood performance testing device according to claim 1, characterized in that: The clamping mechanism (2) comprises a second hydraulic telescopic cylinder (21) arranged at the center of the upper surface of the base (1); the telescopic end of the second hydraulic telescopic cylinder (21) is fixedly connected to a linkage frame (24); a second clamping member (23) for internal support of the test sample is arranged on the upper surface of the base (1) and located inside the linkage frame (24); and a first clamping member (22) for external clamping of the test sample is arranged on the upper surface of the base (1) and located between the linkage frame (24) and the second clamping member (23).

8. The plywood performance testing device according to claim 7, characterized in that: The first clamping member (22) comprises four supporting uprights (222) fixedly connected to the upper surface of the base (1) and distributed in a circular array, the supporting uprights (222) being slidably connected to a pulling frame (221) up and down, two limiting slide bars (223) uniformly distributed up and down passing through and slidably connected to a side of the supporting uprights (222) close to the center of the base (1), the two limiting slide bars (223) being fixedly connected to a clamping seat (225) at one end close to the center of the base (1), a top rod (224) being fixedly connected to a side of the clamping seat (225) away from the center of the base (1), a section of the top rod (224) away from the clamping seat (225) passing through and slidably connected to the supporting uprights (222).

9. The plywood performance testing device according to claim 8, characterized in that: A section of the push rod (224) away from the clamping seat (225) is provided with an inclined surface block that gradually becomes thicker from top to bottom, and an auxiliary roller is provided on the pulling frame (221) at a position corresponding to the inclined surface block to facilitate relative sliding between the pulling frame (221) and the inclined surface of the inclined surface block.

10. The plywood performance testing device according to claim 7, characterized in that: The second clamping member (23) comprises four supporting legs (232) fixedly connected to the upper surface of the base (1) in a circular array, the inner sides of the four supporting legs (232) are commonly fixedly connected to a fixed shell (233), the four vertical inner walls of the fixed shell (233) are slidably connected to arc blocks (235) via connecting columns, the connecting columns on each of the arc blocks (235) penetrate the outside of the fixed shell (233) and are commonly fixedly connected to an extrusion plate (231), a pulling rod (234) penetrates the inner wall of the bottom end of the fixed shell (233) and is slidably connected, the top end of the pulling rod (234) is spherically arranged, and the top end of the pulling rod (234) is slidably matched with the arc surface of the arc block (235).

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