Textile fabric tensile strength detection equipment

Abstract

The invention belongs to the technical field of textile fabric detection, and particularly relates to textile fabric tensile strength detection equipment which comprises a rack, one side of the rack is fixedly connected with a first supporting column, and the other side of the rack is fixedly connected with a second supporting column. Two third supporting columns opposite to the first supporting column and the second supporting column are fixedly installed on the rack, bottom plates are rotationally connected between the third supporting columns and the first supporting column and between the third supporting columns and the second supporting column, and a second pressing plate is arranged on the bottom plate close to the second supporting column. A first pressing plate is arranged on the bottom plate close to the first supporting column; a first clamping mechanism is arranged between one bottom plate and the two ends of the first pressing plate. According to the device, two stretching detection directions do not interfere with each other, stretching detection in one direction can be carried out on the surface of the first pressing plate through the third pressing plate, and meanwhile stretching detection in the other direction is carried out on the second pressing plate relative to the first pressing plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile fabric detection, and particularly relates to a device for detecting the tensile strength of textile fabrics. Background Art

[0002] The tensile strength or tensile strength of a textile fabric refers to the maximum stress value that the material can withstand when subjected to a tensile load, usually expressed as the force per unit area (such as MPa). In the field of textile fibers, the tensile strength test is carried out by fixing both ends of the specimen on the clamps of a tensile testing machine, and then gradually applying a tensile force until the specimen breaks, recording the maximum tensile force and the original cross-sectional area of the specimen during this process, and then calculating the tensile strength value.

[0003] A prior patent (publication number: CN118392664B) discloses a device for detecting the tensile strength of textile fabrics, including a bottom plate, a support plate fixed on the top of the bottom plate, a mounting plate fixed on the top of the support plate, a stretching mechanism arranged on the mounting plate for stretching the fabric, and a water tank arranged above the mounting plate and fixed on the mounting plate by a pair of support frames.

[0004] It can be known from the prior art that when detecting the tensile strength of textile fabrics, generally only one stretching direction of the fabric can be detected, and the fabric needs to be repositioned to detect the other stretching direction. The staff needs to disassemble the fabric and then reinstall it for detection. Summary of the Invention

[0005] Based on the technical problem in the background art that when detecting the tensile strength of textile fabrics, generally only one stretching direction of the fabric can be detected, and the fabric needs to be repositioned to detect the other stretching direction. The staff needs to disassemble the fabric and then reinstall it for detection, the present invention proposes a device for detecting the tensile strength of textile fabrics.

[0006] A device for detecting the tensile strength of textile fabrics proposed by the present invention includes a frame. One side of the frame is fixedly connected with a first support column, and the other side of the frame is fixedly connected with a second support column. Two third support columns are fixedly installed on the frame and are arranged opposite to the first support column and the second support column respectively. A bottom plate is rotatably connected between the third support column and the first support column, and between the third support column and the second support column. A second pressing plate is arranged on the bottom plate close to the second support column, and a first pressing plate is arranged on the bottom plate close to the first support column.

[0007] A first clamping mechanism is arranged between one of the bottom plates and both ends of the first pressing plate, and a second clamping mechanism is arranged between the other bottom plate and both ends of the second pressing plate.

[0008] The upper ends of the first support column and the second support column are both fixedly connected with cross bars, a first air cylinder is installed on the cross bars, the first air cylinder is connected with two pressing shafts, the lower ends of the two pressing shafts are both rotatably connected with third pressing plates, and a first spring is connected between the two third pressing plates.

[0009] Preferably, the first clamping mechanism includes a first U-shaped shaft and a second spring. One end of the first U-shaped shaft is fixedly connected with the end of the bottom plate, the other end of the first U-shaped shaft penetrates through the first pressing plate, and the two ends of the second spring are respectively fixedly connected with the inner wall of the first U-shaped shaft and the surface of the first pressing plate, and the second spring is electrically energized.

[0010] Preferably, the second clamping mechanism includes a second U-shaped plate, a second air cylinder and a second piston shaft. One end of the second U-shaped plate is fixedly connected with the end of the bottom plate, the other end of the second U-shaped plate penetrates through the second pressing plate, the second air cylinder is fixedly installed on the second U-shaped plate, a second piston shaft is hermetically inserted in the second air cylinder, the second piston shaft is fixedly connected with the surface of the second pressing plate, and an air pipe is connected to the second air cylinder.

[0011] Preferably, the first air cylinder is fixedly installed on the cross bar, and a first piston shaft is hermetically inserted in the first air cylinder. The upper end of the first piston shaft is fixedly connected with a plurality of U-shaped rods. The U-shaped rods slide through the cross bar, and the two ends of the U-shaped rods are respectively slidably connected to the two pressing shafts through sliders, and an air pipe is also connected to the first air cylinder.

[0012] Preferably, a chute is opened on the pressing shaft, the cross section of the slider is T-shaped, the slider is slidably installed in the chute, and the lower end of the U-shaped rod is rotatably connected with the slider.

[0013] Preferably, a first rotating shaft is rotatably installed on the first support column. The first rotating shaft is fixedly connected with the bottom plate through a connecting block. A threaded sleeve is threadedly sleeved on the first rotating shaft. An opening is opened on the first support column, and a hook-shaped shaft is slidably connected to the opening. One side of the hook-shaped shaft is inserted on the connecting block through two insertion shafts.

[0014] Preferably, a rotating mechanism is arranged on the second support column. The rotating mechanism includes a telescopic cylinder and a rotating plate. A second rotating shaft is rotatably connected to the second support column. The second rotating shaft is fixedly connected with the adjacent bottom plate. One end of the rotating plate is fixedly connected with the second rotating shaft, and the other end of the rotating plate is rotatably connected with the driving end of the telescopic cylinder.

[0015] Preferably, a limiting mechanism cooperating with the rotating mechanism is arranged on the second support column. The limiting mechanism comprises an L-shaped shaft and a third spring. One end of the L-shaped shaft is rotatably connected to the second support column. One end of the third spring is fixedly connected to the second support column, and the other end of the third spring is fixedly connected to the other end of the L-shaped shaft. The third spring is energized.

[0016] Preferably, a connecting block is rotatably connected to one end of the rotating plate away from the second rotating shaft, and the driving end of the telescopic cylinder is fixedly connected to the connecting block.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The device tests the detection end of the bottom plate through the rotating mechanism. During the rotation process, the fabric can be directly stretched, and then the anti-tensile strength detection of the fabric is carried out. By the telescopic movement of the telescopic cylinder to drive the rotation of the second rotating shaft, the path can be effectively amplified, so that the detection can be carried out slowly.

[0019] 2. The two stretching detection directions in the device do not interfere with each other. One-direction stretching detection can be carried out on the surface of the first pressing plate through the third pressing plate, and at the same time, another-direction stretching detection can be carried out on the second pressing plate relative to the first pressing plate. It can also be carried out a single-direction stretching detection separately through the second pressing plate and the first pressing plate, or a single-direction stretching detection can be carried out on the surfaces of the second pressing plate and the first pressing plate at the same time through the third pressing plate. Therefore, the device can simultaneously carry out the anti-tensile strength detection of the fabric in the warp and weft directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic view of one side structure of a textile fabric anti-tensile strength detection device proposed by the present invention;

[0021] Figure 2 is a schematic view of the other side structure of a textile fabric anti-tensile strength detection device proposed by the present invention;

[0022] Figure 3 is a schematic view of the rear side structure of a textile fabric anti-tensile strength detection device proposed by the present invention;

[0023] Figure 4 is Figure 1 a schematic plan view of;

[0024] Figure 5 is a schematic view of the installation structure among the bottom plate, the second pressing plate and the cross bar;

[0025] Figure 6 is a schematic view of the structure of the rotating mechanism;

[0026] Figure 7Schematic diagram of the installation structure among the bottom plate, the first pressing plate and the cross bar;

[0027] Figure 8 is Figure 7 Enlarged structure schematic diagram at position A in

[0028] Figure 9 Schematic diagram of the fabric wound around the bottom plate, the second pressing plate and the first pressing plate.

[0029] In the figure: 1, frame; 2, cross bar; 3, third support pillar; 4, first support pillar; 5, second support pillar; 6, bottom plate; 7, second pressing plate; 8, first pressing plate; 9, pressing shaft; 10, first air cylinder; 11, first spring; 12, telescopic air cylinder; 13, L-shaped shaft; 14, first rotating shaft; 15, threaded sleeve; 16, second rotating shaft; 17, pressing plate; 18, rotating plate; 19, connecting block; 20, third spring; 21, second spring; 22, hook-shaped shaft; 23, inserting shaft; 24, connecting block; 25, first piston shaft; 26, connecting shaft; 27, U-shaped rod; 28, slider; 29, first U-shaped shaft; 30, opening; 31, second U-shaped plate; 32, second air cylinder; 33, second piston shaft. Detailed implementation manners

[0030] 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.

[0031] Referring to Figures 1-9 , a textile fabric tensile strength detection device includes a frame 1. A first support pillar 4 is fixedly connected to one side of the frame 1, and a second support pillar 5 is fixedly connected to the other side of the frame 1. Two third support pillars 3 are fixedly installed on the frame 1 and are respectively arranged opposite to the first support pillar 4 and the second support pillar 5. A bottom plate 6 is rotatably connected between the third support pillar 3 and the first support pillar 4, and between the third support pillar 3 and the second support pillar 5. A second pressing plate 7 is arranged on the bottom plate 6 close to the second support pillar 5, and a first pressing plate 8 is arranged on the bottom plate 6 close to the first support pillar 4;

[0032] A first clamping mechanism is arranged between the two ends of one bottom plate 6 and the first pressing plate 8, and a second clamping mechanism is arranged between the two ends of the other bottom plate 6 and the second pressing plate 7;

[0033] The upper ends of the first support pillar 4 and the second support pillar 5 are both fixedly connected with a cross bar 2. A first air cylinder 10 is installed on the cross bar 2. The first air cylinder 10 is connected with two pressing shafts 9. The lower ends of the two pressing shafts 9 are both rotatably connected with a third pressing plate 17. A first spring 11 is connected between the two third pressing plates 17.

[0034] The first clamping mechanism includes a first U-shaped shaft 29 and a second spring 21. One end of the first U-shaped shaft 29 is fixedly connected to the end of the bottom plate 6, and the other end of the first U-shaped shaft 29 passes through the first pressing plate 8. The two ends of the second spring 21 are respectively fixedly connected to the inner wall of the first U-shaped shaft 29 and the surface of the first pressing plate 8, and the second spring 21 is electrically energized. When the second spring 21 is energized, it can contract, thereby driving the first pressing plate 8 to move away from the bottom plate 6, so that a larger space will be formed between the bottom plate 6 and the first pressing plate 8. Pass the fabric to be detected through the space between the bottom plate 6 and the first pressing plate 8, cut off the power supply of the second spring 21 to make it stretch, so that the bottom plate 6 and the first pressing plate 8 can be closed to effectively clamp and fix the fabric.

[0035] The second clamping mechanism includes a second U-shaped plate 31, a second air cylinder 32 and a second piston shaft 33. One end of the second U-shaped plate 31 is fixedly connected to the end of the bottom plate 6, and the other end of the second U-shaped plate 31 passes through the second pressing plate 7. The second air cylinder 32 is fixedly installed on the second U-shaped plate 31, and a second piston shaft 33 is hermetically inserted in the second air cylinder 32. The second piston shaft 33 is fixedly connected to the surface of the second pressing plate 7, and an air pipe is connected to the second air cylinder 32. When it is necessary to close or open the second pressing plate 7 and the bottom plate 6, inflate or deflate the second air cylinder 32 through the air pipe. When inflating, it can push the second piston shaft 33 to move outwards, so as to clamp the second pressing plate 7 and the bottom plate 6 together. On the contrary, when pumping air, the second piston shaft 33 can be sucked inwards, and the bottom plate 6 and the second pressing plate 7 can be separated to place the fabric.

[0036] The first air cylinder 10 is fixedly installed on the cross bar 2, and a first piston shaft 25 is hermetically inserted in the first air cylinder 10. The upper end of the first piston shaft 25 is fixedly connected with a plurality of U-shaped rods 27. The U-shaped rods 27 slide through the cross bar 2, and the two ends of the U-shaped rods 27 are respectively slidably connected to the two pressing shafts 9 through sliders 28. An air pipe is also connected to the first air cylinder 10. By inflating and deflating the first air cylinder 10 through the air pipe, when inflating, it can push the first piston shaft 25 to move upwards. The first piston shaft 25 drives the U-shaped rods 27 to move upwards through the connecting shaft 26, and the U-shaped rods 27 will not exert a downward pressing force on the pressing shafts 9. On the contrary, when pumping air from the first air cylinder 10, the first piston shaft 25, the connecting shaft 26 and the U-shaped rods 27 press downwards, pressing down the two pressing shafts 9, so as to exert a force on the third pressing plate 17, so that the third pressing plate 17 can press against the surface of the fabric to limit it. The first spring 11 is connected to the two third pressing plates 17. Pressing down overcomes the elastic force of the first spring 11, so that the two third pressing plates 17 move away from each other, and the fabric can be pulled to both sides during the process of moving away from each other to test the strength.

[0037] The pressing shaft 9 is provided with a slide groove, the cross section of the slider 28 is T-shaped, the slider 28 is slidably installed in the slide groove, and the lower end of the U-shaped rod 27 is rotatably connected to the slider 28. The slider 28 is used to connect the U-shaped rod 27 and the pressing shaft 9, so that the U-shaped rod 27 can be slidably connected relative to the pressing shaft 9.

[0038] The first shaft 14 is rotatably mounted on the first pillar 4, and the first shaft 14 is fixedly connected to the bottom plate 6 through the connecting block 24. The first shaft 14 is threadedly sleeved with a threaded sleeve 15. The first pillar 4 is provided with an opening 30, and the opening 30 is slidably connected with a hook-shaped shaft 22, and one side of the hook-shaped shaft 22 is inserted into the connecting block 24 through two plug-in shafts 23. The bottom plate 6 and the first pressing plate 8 clamp one end of the fabric, and then the bottom plate 6 and the first pressing plate 8 are rotated through the first shaft 14 to wrap the fabric around the bottom plate 6 and the first pressing plate 8, and the hook-shaped shaft 22 is lowered to insert the plug-in shaft 23 into the connecting block 24, and the threaded sleeve 15 is rotated to reinforce the angle of the first shaft 14.

[0039] The second pillar 5 is provided with a rotating mechanism, which includes a telescopic cylinder 12 and a rotating plate 18. The second pillar 5 is rotatably connected with a second rotating shaft 16, which is fixedly connected to the adjacent bottom plate 6. One end of the rotating plate 18 is fixedly connected to the second rotating shaft 16, and the other end of the rotating plate 18 is rotatably connected to the driving end of the telescopic cylinder 12. When the driving end of the telescopic cylinder 12 is extended or retracted, the rotating plate 18 can be driven to rotate relative to the second rotating shaft 16, and then the second rotating shaft 16 can drive the bottom plate 6 to rotate, and the fabric is continuously wound to apply a force, so as to test the tensile strength of the fabric.

[0040] The second pillar 5 is provided with a limiting mechanism used in conjunction with the rotating mechanism, the limiting mechanism comprising an L-shaped shaft 13 and a third spring 20, one end of the L-shaped shaft 13 is rotatably connected to the second pillar 5, one end of the third spring 20 is fixedly connected to the second pillar 5, the other end of the third spring 20 is fixedly connected to the other end of the L-shaped shaft 13, and the third spring 20 is energized. When the rotating plate 18 rotates to the highest point, the third spring 20 is energized to shrink, so that it can support the surface of the rotating plate 18 and push it around the highest point.

[0041] One end of the rotating plate 18 away from the second rotating shaft 16 is rotatably connected to a connecting block 19, and the driving end of the telescopic cylinder 12 is fixedly connected to the connecting block 19. The connecting block 19 is used to connect the rotating plate 18 with the telescopic cylinder 12, and the connecting block 19 is convenient for adapting to the change of angle.

[0042] When testing the tensile strength of textile fabrics, the fabric is divided into a fixed end and a test end. The fixed end is clamped between the first pressing plate 8 and the bottom plate 6, and the test end is clamped between the second pressing plate 7 and the bottom plate 6. First, the fixed end is limited. The bottom plate 6 is rotated through the first rotating shaft 14, and the fabric is wound around the outer surfaces of the bottom plate 6 and the first pressing plate 8 for two turns. The hook-shaped shaft 22 slides down along the opening 30, and the insertion shaft 23 is inserted into the connecting block 24, and the threaded sleeve 15 is rotated to reinforce the angle of the first rotating shaft 14 again. After the test end is clamped between the bottom plate 6 and the second pressing plate 7, when clamping, the fabric bypasses the outer surface of the second pressing plate 7 and then passes through between the bottom plate 6 and the second pressing plate 7, and then the test end is limited. When the fabrics at the fixed end and the limited end are both fixed, the fabric is pressed and fixed under the third pressing plate 17 above it. The first air cylinder 10 pushes the U-shaped rod 27 downward to press the pressing shaft 9. The two third pressing plates 17 are connected by the first spring 11, and the two third pressing plates 17 have a driving force to approach each other. Under the action of the driving force, the fabric can be pressed and fixed.

[0043] The bottom plate 6 test end is tested through the rotating mechanism. The telescopic cylinder 12 contracts through the driving end. During the contraction process, it will drive the rotating plate 18 to rotate around the second rotating shaft 16. When extending, it can push the rotating plate 18 to rotate upward, and when contracting, it can pull the rotating plate 18 to turn downward. When the rotating plate 18 passes the highest point position, the third spring 20 will be energized and contracted to pull the L-shaped shaft 13 to rotate. The rotation of the L-shaped shaft 13 will squeeze the rotating plate 18, so as to help the rotating plate 18 pass the highest point position. The rotation effect of the bottom plate 6 is realized by rotating around the second rotating shaft 16. During the rotation process, the fabric can be directly stretched, and then the tensile strength test of the fabric is carried out. By driving the rotation of the second rotating shaft 16 through the expansion and contraction of the telescopic cylinder 12, the path can be effectively magnified, so that the detection can be carried out slowly. When the rotating mechanism is testing, the two third pressing plates 17 above can move upward adaptively and slide along the edges of the second pressing plate 7 and the bottom plate 6.

[0044] The device can also detect the tensile strength of the fabric in another direction simultaneously. After the fixed end and the detection end of the fabric are fixed respectively, the first air cylinder 10 is evacuated. When the first air cylinder 10 is evacuated, the connecting shaft 26 can be driven to move downward by the first piston rod 25. The connecting shaft 26 drives the U-shaped rod 27 to move downward. The lower end of the U-shaped rod 27 presses the two pressing shafts 9, pressing against the elastic force of the first spring 11. During the pressing process, the included angle between the two pressing shafts 9 increases, and the distance between the two connected third pressing plates 17 increases, so as to move the two third pressing plates 17 to both sides, thereby pulling the fabric to both sides and then testing the tensile strength of the fabric in another direction. Moreover, the two tensile detection directions do not interfere with each other. One-direction tensile detection can be carried out through the third pressing plate 17 on the surface of the first pressing plate 8. At the same time, another-direction tensile detection can be carried out on the second pressing plate 7 relative to the first pressing plate 8. It can also be carried out a single-direction tensile detection separately through the second pressing plate 7 and the first pressing plate 8, or a single-direction tensile detection can be carried out on the surfaces of the second pressing plate 7 and the first pressing plate 8 simultaneously through the third pressing plate 17. Therefore, the device can detect the tensile strength of the fabric in both warp and weft directions simultaneously.

[0045] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A textile fabric tensile strength testing device, characterized in that, It includes a frame (1). One side of the frame (1) is fixedly connected to a first support column (4), and the other side of the frame (1) is fixedly connected to a second support column (5). Two third support columns (3) are fixedly installed on the frame (1) and are respectively arranged opposite to the first support column (4) and the second support column (5). A bottom plate (6) is rotatably connected between the third support column (3) and the first support column (4), and between the third support column (3) and the second support column (5). A second pressing plate (7) is arranged on the bottom plate (6) close to the second support column (5), and a first pressing plate (8) is arranged on the bottom plate (6) close to the first support column (4). A first clamping mechanism is arranged between the two ends of one of the bottom plates (6) and the first pressing plate (8), and a second clamping mechanism is arranged between the two ends of the other bottom plate (6) and the second pressing plate (7). Cross bars (2) are fixedly connected to the upper ends of the first support column (4) and the second support column (5). A first air cylinder (10) is installed on the cross bar (2). The first air cylinder (10) is connected to two pressing shafts (9). The lower ends of the two pressing shafts (9) are rotatably connected to third pressing plates (17). A first spring (11) is connected between the two third pressing plates (17).

2. The textile fabric tensile strength testing device according to claim 1, characterized in that, The first clamping mechanism includes a first U-shaped shaft (29) and a second spring (21). One end of the first U-shaped shaft (29) is fixedly connected to the end of the bottom plate (6). The other end of the first U-shaped shaft (29) penetrates through the first pressing plate (8). The two ends of the second spring (21) are respectively fixedly connected to the inner wall of the first U-shaped shaft (29) and the surface of the first pressing plate (8). The second spring (21) is electrically energized.

3. The tensile strength detection device for a textile fabric according to claim 1, characterized in that, The second clamping mechanism includes a second U-shaped plate (31), a second air cylinder (32) and a second piston shaft (33). One end of the second U-shaped plate (31) is fixedly connected to the end of the bottom plate (6). The other end of the second U-shaped plate (31) penetrates through the second pressing plate (7). The second air cylinder (32) is fixedly installed on the second U-shaped plate (31). A second piston shaft (33) is hermetically inserted into the second air cylinder (32). The second piston shaft (33) is fixedly connected to the surface of the second pressing plate (7). A trachea is connected to the second air cylinder (32).

4. An anti-tensile strength detection device for textile fabrics according to claim 1, characterized in that, The first air cylinder (10) is fixedly installed on the cross bar (2), and a first piston shaft (25) is hermetically inserted into the first air cylinder (10). The upper end of the first piston shaft (25) is fixedly connected to a plurality of U-shaped rods (27). The U-shaped rods (27) slide through the cross bar (2). The two ends of the U-shaped rods (27) are respectively slidably connected to the two pressing shafts (9) through sliders (28). A trachea is also connected to the first air cylinder (10).

5. The tensile strength detection device for a textile fabric according to claim 4, wherein A chute is formed on the pressing shaft (9). The cross section of the slider (28) is T-shaped. The slider (28) is slidably installed in the chute. The lower end of the U-shaped rod (27) is rotatably connected to the slider (28).

6. The tensile strength detection device for a textile fabric according to claim 1, characterized in that, A first rotating shaft (14) is rotatably mounted on the first support column (4). The first rotating shaft (14) is fixedly connected to the bottom plate (6) through a connecting block (24). A threaded sleeve (15) is threadedly sleeved on the first rotating shaft (14). An opening (30) is formed in the first support column (4). A hook-shaped shaft (22) is slidably connected to the opening (30). One side of the hook-shaped shaft (22) is inserted into the connecting block (24) through two insertion shafts (23).

7. The tensile strength detection device for a textile fabric according to claim 1, wherein, A rotating mechanism is provided on the second support column (5). The rotating mechanism includes a telescopic cylinder (12) and a rotating plate (18). A second rotating shaft (16) is rotatably connected to the second support column (5). The second rotating shaft (16) is fixedly connected to the adjacent bottom plate (6). One end of the rotating plate (18) is fixedly connected to the second rotating shaft (16). The other end of the rotating plate (18) is rotatably connected to the driving end of the telescopic cylinder (12).

8. An anti-tensile strength detection device for textile fabrics according to claim 7, characterized in that, A limiting mechanism is provided on the second support column (5) and is used in cooperation with the rotating mechanism. The limiting mechanism includes an L-shaped shaft (13) and a third spring (20). One end of the L-shaped shaft (13) is rotatably connected to the second support column (5). One end of the third spring (20) is fixedly connected to the second support column (5). The other end of the third spring (20) is fixedly connected to the other end of the L-shaped shaft (13). The third spring (20) is electrically energized.

9. The textile fabric tensile strength testing device according to claim 8, characterized in that, A connecting block (19) is rotatably connected to the end of the rotating plate (18) away from the second rotating shaft (16). The driving end of the telescopic cylinder (12) is fixedly connected to the connecting block (19).

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