Building structure reinforcing device

Abstract

The utility model discloses a building structure reinforcing device, which relates to the technical field of building structures and comprises a reinforcing transverse plate, the left side of the top of the reinforcing transverse plate is fixedly connected with an angle adjusting component, and the right side of the top of the reinforcing transverse plate is fixedly connected with two reinforcing vertical plate fixing components which are symmetrical front and back. A first reinforcing vertical plate is rotationally connected between the opposite side walls of the two reinforcing vertical plate fixing assemblies. The second reinforcing vertical plate can slide in the first reinforcing vertical plate, kidney-shaped holes are formed in the front side and the rear side of the second reinforcing vertical plate, the first bolts arranged on the front side and the rear side of the first reinforcing vertical plate are adjusted to firmly abut against the inner walls of the kidney-shaped holes, the device is suitable for relatively fixing different positions of a building, the application range of the device is further expanded, and the practicability is high. The included angle between the reinforcing transverse plate and the first reinforcing vertical plate can be changed through the angle adjusting assembly and the reinforcing vertical plate fixing assembly, the building structure is further reinforced, and meanwhile different angles between the building structures are adapted.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, in particular to a building structure reinforcement device. Background Art

[0002] Building structure reinforcement is to strengthen the above-ground components such as beams, slabs, columns, shear walls and underground structures such as foundations of existing buildings in a targeted manner, aiming to improve the bearing capacity and bending and shear resistance of the components. After modeling and analyzing the original building according to the structural design software, local components or the entire building are reinforced. The existing technology has the following problems:

[0003] When reinforcing a building structure, the existing building structure reinforcement device cannot be applied to different positions of a relatively fixed building because the reinforcement plate cannot be extended or retracted. The fixing range is relatively small and the stability of the device is poor, thereby reducing the application range of the device. In addition, the existing building structure reinforcement device cannot adjust the angle between the reinforcement horizontal plate and the reinforcement vertical plate, resulting in the inability to adapt to different angles between building structures. Utility Model Content

[0004] The utility model provides a building structure reinforcement device to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A building structure reinforcement device comprises a building structure body, a reinforcement transverse plate and a plurality of reinforcement plate fixing bolts, wherein the top left side of the reinforcement transverse plate is fixedly connected with an angle adjustment component, the top right side of the reinforcement transverse plate is fixedly connected with two reinforcement vertical plate fixing components that are symmetrical front and back, a reinforcement vertical plate 1 is rotatably connected between the two relative side walls of the two reinforcement vertical plate fixing components, the reinforcement vertical plate 1 is hollow inside and a reinforcement vertical plate 2 is slidably connected to the inner wall, the front and rear sides of the reinforcement vertical plate 2 are provided with vertical waist holes, the front and rear sides of the reinforcement vertical plate 1 are threadedly connected with bolts 1 through the threaded holes, and the top four corners of the reinforcement transverse plate Both are provided with threaded holes and are fixedly connected to the building structure body by reinforcing plate fixing bolts threaded therewith; the reinforcing horizontal plate is fixedly connected to the building structure body by a plurality of reinforcing plate fixing bolts; the upper end of the left side wall of the reinforcing vertical plate 2 is provided with two front-to-back symmetrical threaded holes and is fixedly connected to the building structure body by reinforcing plate fixing bolts threaded therewith; the lower end of the left side wall of the reinforcing vertical plate 1 is provided with two front-to-back symmetrical threaded holes and is fixedly connected to the building structure body by reinforcing plate fixing bolts threaded therewith; the top of the left side wall of the reinforcing vertical plate 2 is fixedly connected with two front-to-back symmetrical fixing blocks 1.

[0007] A further improvement of the technical solution of the utility model is that the angle adjustment assembly comprises an adjusting frame and an adjusting block 1, two symmetrical grooves are opened in the middle of the front and rear sides of the adjusting frame, and four symmetrical fixing blocks 2 are fixedly connected to the bottom of the front and rear side walls of the adjusting frame, and threaded holes are opened at the tops of the four fixing blocks 2 and are fixedly connected to the reinforcing cross plate through bolts threadedly connected thereto. The right end of the adjusting block 1 penetrates through the left inner wall of the adjusting frame and is fixedly connected to a threaded rod 1, and the outer surface of the threaded rod 1 is threadedly connected to a threaded sleeve, and the front and rear sides of the threaded sleeve are fixedly connected to sliders, and the outer walls of the two sliders are slidably connected to the grooves, and the ends of the two sliders away from each other respectively penetrate through the front and rear outer walls of the adjusting frame and are rotatably connected to two connecting telescopic rods, and the middle parts of the two connecting telescopic rods away from each other are threadedly connected to bolts 2 through the threaded holes set, and the end of the connecting telescopic rod away from the slider is rotatably connected to the fixing block 1.

[0008] A further improvement of the technical solution of the utility model is that: the adjustment frame is a hollow structure with an opening at the upper end, and the vertical height of the groove is adapted to the diameter of the slider.

[0009] The top end of the adjusting block 2 is fixedly connected with a threaded rod 2 that penetrates the inner wall of the fixing block 3 and is tightly fitted with the outer wall of the lower end of the rotating shaft.

[0010] A further improvement of the technical solution of the utility model is that the upper and lower ends of the spring are respectively fixedly connected to the bottom of the second horizontal plate and the top of the fixed block three, and the threaded rod two is threadedly connected to the threaded hole set in the middle of the top end of the first horizontal plate.

[0011] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0012] 1. The utility model provides a building structure reinforcement device, which is fixed on the building wall to be reinforced by fixing bolts of the reinforcement plate. Since the reinforcement vertical plate 2 can slide inside the reinforcement vertical plate 1, and waist holes are arranged on the front and rear sides, the bolts 1 arranged on the front and rear sides of the reinforcement vertical plate 1 can be adjusted to firmly press against the inner wall of the waist hole, and the length suitable for the building structure can be selected and then the reinforcement vertical plate 2 can be fixed, so that it is convenient to use and is suitable for different positions of relatively fixed buildings. The fixing range is relatively large, which further enhances the stability of the device and further expands the application range of the device.

[0013] 2. The utility model provides a building structure reinforcement device, which is provided with an angle adjustment component and a reinforcement vertical plate fixing component, and the threaded rod is driven to rotate by rotating the adjustment block. When the threaded rod rotates, the threaded sleeve threadedly connected thereto will move left and right along the direction of the threaded rod, and the slider will slide left and right inside the groove. The left and right sliding of the slider drives the connected telescopic rod rotatably connected thereto to move. Since the other end of the connected telescopic rod is rotatably connected to the reinforcement vertical plate two, and the side wall of the connected telescopic rod is also provided with bolts two for controlling its telescopic length, the connected telescopic rod is set to a required length by adjusting the bolts two, and a reinforcement vertical plate fixing component is provided between the reinforcement horizontal plate and the reinforcement vertical plate one, so that the angle between the reinforcement horizontal plate and the reinforcement vertical plate one can be changed, and the building structure can be further reinforced, and at the same time, it can adapt to different angles between the building structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 For the utility model Figure 1 A magnified view of the structure at center;

[0016] Figure 3 It is a schematic diagram of the structure of the utility model from an isometric perspective;

[0017] Figure 4 This is a schematic diagram of the angle adjustment component structure of the utility model;

[0018] Figure 5 It is a schematic diagram of the structure of the reinforcement vertical plate fixing assembly of the utility model.

[0019] In the figure: 101, building structure body; 102, reinforcing horizontal plate; 103, reinforcing vertical plate one; 104, reinforcing vertical plate two; 105, reinforcing plate fixing bolt; 106, fixing block one; 107, waist hole; 108, bolt one; 2, angle adjustment assembly; 201, adjustment frame; 202, adjustment block one; 203, threaded rod one; 204, threaded sleeve; 205, groove; 206, fixing block two; 207, connecting telescopic rod; 208, bolt two; 209, slider; 3, reinforcing vertical plate fixing assembly; 301, L-shaped fixing plate; 302, bolt three; 303, horizontal plate one; 304, threaded rod two; 305, adjustment block two; 306, connecting column; 307, fixing block three; 308, spring; 309, horizontal plate two; 310, rotating shaft. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods:

[0021] like Figure 1 , Figure 2 As shown, the utility model provides a building structure reinforcement device, including a building structure body 101, a reinforcement transverse plate 102 and a plurality of reinforcement plate fixing bolts 105, the top left side of the reinforcement transverse plate 102 is fixedly connected with an angle adjustment component 2, the top right side of the reinforcement transverse plate 102 is fixedly connected with two front-to-back symmetrical reinforcement vertical plate fixing components 3, a reinforcement vertical plate 1 103 is rotatably connected between the two opposite side walls of the two reinforcement vertical plate fixing components 3, the reinforcement vertical plate 1 103 is hollow inside and a reinforcement vertical plate 2 104 is slidably connected to the inner wall, the front and rear sides of the reinforcement vertical plate 2 104 are both provided with vertical waist holes 107, the front and rear tops of the reinforcement vertical plate 1 103 are both threadedly connected with bolts 108 through the threaded holes provided, and the reinforcement transverse plate 102 is fixedly connected with an angle adjustment component 2, the top right side of the reinforcement transverse plate 102 is fixedly connected with two front-to-back symmetrical reinforcement vertical plate fixing components 3, the two reinforcement vertical plate fixing components 3 are rotatably connected with a reinforcement vertical plate 1 103, the reinforcement vertical plate 1 103 is hollow inside and a reinforcement vertical plate 2 104 is slidably connected to the inner wall, the front and rear sides of the reinforcement vertical plate 2 104 are both provided with vertical waist holes 107, the front and rear tops of the reinforcement vertical plate 1 103 are both threadedly connected with bolts 108 through the threaded holes provided, and the reinforcement The four corners of the top are provided with threaded holes and are fixedly connected to the building structure body 101 by reinforcing plate fixing bolts 105 threadedly connected thereto; the reinforcing horizontal plate 102 is fixedly connected to the building structure body 101 by a plurality of reinforcing plate fixing bolts 105; the upper end of the left side wall of the reinforcing vertical plate 2 104 is provided with two front-to-back symmetrical threaded holes and is fixedly connected to the building structure body 101 by reinforcing plate fixing bolts 105 threadedly connected thereto; the lower end of the left side wall of the reinforcing vertical plate 1 103 is provided with two front-to-back symmetrical threaded holes and is fixedly connected to the building structure body 101 by reinforcing plate fixing bolts 105 threadedly connected thereto; and the top of the left side wall of the reinforcing vertical plate 2 104 is fixedly connected with two front-to-back symmetrical fixing blocks 1 106.

[0022] When in use, first fix the reinforcing horizontal plate 102, the reinforcing vertical plate 103 and the reinforcing vertical plate 104 to the building wall that needs to be reinforced through the reinforcing plate fixing bolts 105 arranged on the surface thereof, because the reinforcing vertical plate 104 can slide inside the reinforcing vertical plate 103 and has waist holes 107 on the front and back sides, the bolts 108 arranged on the front and back sides of the reinforcing vertical plate 103 can be adjusted to firmly press against the inner wall of the waist hole 107, and the length suitable for the building structure can be selected and then the reinforcing vertical plate 104 can be fixed.

[0023] like Figure 3 , Figure 4 As shown, the angle adjustment assembly 2 includes an adjustment frame 201 and an adjustment block 1 202. Two symmetrical grooves 205 are provided in the middle of the front and rear sides of the adjustment frame 201. Four symmetrical fixing blocks 206 are fixedly connected to the bottom of the front and rear side walls of the adjustment frame 201. The tops of the four fixing blocks 206 are all provided with threaded holes and are fixedly connected to the reinforcing cross plate 102 through bolts threaded therewith. The right end of the adjustment block 1 202 penetrates the left inner wall of the adjustment frame 201 and is fixedly connected to a threaded rod 1 203. The threaded rod 1 203 The outer surface is threadedly connected with a threaded sleeve 204, and sliders 209 are fixedly connected to the front and rear sides of the threaded sleeve 204. The outer walls of the two sliders 209 are slidably connected to the groove 205. The ends of the two sliders 209 that are away from each other respectively penetrate the front and rear outer walls of the adjustment frame 201 and are rotatably connected to two connecting telescopic rods 207. The middle part of the side of the two connecting telescopic rods 207 that are away from each other is threadedly connected with a bolt 208 through a threaded hole set therein, and the end of the connecting telescopic rod 207 that is away from the slider 209 is rotatably connected to the fixed block 106.

[0024] like Figure 3 , Figure 4 As shown, the adjustment frame 201 is a hollow structure with an opening at the upper end, and the vertical height of the groove 205 is adapted to the diameter of the slider 209. Since the sizes of the groove 205 and the slider 209 are adapted to each other, the slider 209 can slide more smoothly on the inner wall of the groove 205.

[0025] Then, after the reinforcing horizontal plate 102, the reinforcing vertical plate 103 and the reinforcing vertical plate 204 are fixed to the building structure body 101, since the angle between the building structure body 101 is not fixed, the threaded rod 1 203 connected thereto can be driven to rotate by rotating the adjusting block 1 202. When the threaded rod 1 203 rotates, the threaded sleeve 204 threadedly connected thereto will move left and right along the direction of the threaded rod 1 203. When the threaded sleeve 204 moves, the sliders 209 arranged on the front and rear sides thereof will slide left and right inside the groove 205. The sliders 209 The left and right sliding drives the connecting telescopic rod 207 that is rotatably connected to it to move. Since the other end of the connecting telescopic rod 207 is rotatably connected to the reinforced vertical plate 104, and the side wall of the connecting telescopic rod 207 is also provided with a bolt 208 that can be used to control its telescopic length, the connecting telescopic rod 207 is set to a required length by adjusting the bolt 208. At the same time, a reinforced vertical plate fixing assembly 3 is provided between the reinforced horizontal plate 102 and the reinforced vertical plate 103, so that the angle between the reinforced horizontal plate 102 and the reinforced vertical plate 103 can be changed to adapt to different angles between building structures.

[0026] like Figure 5 As shown, the reinforcement vertical plate fixing assembly 3 includes an L-shaped fixing plate 301, a bolt 302 and an adjusting block 2 305. A threaded hole is provided at the top of the protruding block at the front end of the L-shaped fixing plate 301 and is fixedly connected to the reinforcement horizontal plate 102 through the bolt 302 threadedly connected thereto. A fixing block 307 is fixedly connected to the top of the L-shaped fixing plate 301. Two vertical cylindrical sliding grooves symmetrically arranged in the interior of the fixing block 307 are slidably connected to the connecting column 306. The upper and lower ends of the two connecting columns 306 are respectively fixedly connected to the horizontal plate 2 30 9 and the horizontal plate 1 303, the upper ends of the outer surfaces of the two connecting columns 306 are provided with a spring 308 located between the horizontal plate 2 309 and the fixed block 307, the internal horizontal direction of the fixed block 307 is provided with a cylindrical slide groove running forward and backward and is rotatably connected with a rotating shaft 310, the front and rear ends of the rotating shaft 310 respectively penetrate the front and rear sides of the reinforced vertical plate 103 and are fixedly connected to the reinforced vertical plate 103, the top end of the adjusting block 2 305 is fixedly connected with a threaded rod 2 304 which penetrates the inner wall of the fixed block 307 and is tightly fitted with the outer wall of the lower end of the rotating shaft 310.

[0027] like Figure 5 As shown, the upper and lower ends of the spring 308 are respectively fixedly connected to the bottom of the second horizontal plate 309 and the top of the third fixed block 307, and the second threaded rod 304 is threadedly connected to the threaded hole set in the middle of the top of the first horizontal plate 303.

[0028] Finally, when the angle between the reinforcement vertical plate 103 and the reinforcement horizontal plate 102 is adjusted, in addition to fixing the angle between the reinforcement vertical plate 103 and the reinforcement horizontal plate 102 by the bolt 208 arranged on the side wall of the connecting telescopic rod 207, the angle can be further limited by the reinforcement vertical plate fixing assembly 3, and the rotation adjustment block 205 drives the threaded rod 204 fixedly connected thereto to rotate, because the threaded rod 204 is threadedly connected to the horizontal plate 103. When the threaded rod 204 rotates, it can drive the horizontal plate 103 and the connecting column 306 connected thereto to move downward, and the connecting column 306 moves downward to compress the spring 308 arranged on its outer surface, so that the top of the threaded rod 204 can press the outer wall of the rotating shaft 310, further fixing the angle between the reinforcement horizontal plate 102 and the reinforcement vertical plate 103, and realizing the reinforcement effect on the building structure.

[0029] The working principle of the building structure reinforcement device is described in detail below.

[0030] like Figure 1-5 As shown, first, the reinforcing horizontal plate 102, the reinforcing vertical plate 103 and the reinforcing vertical plate 2 104 are respectively fixed to the building wall to be reinforced by the reinforcing plate fixing bolts 105 arranged on the surface thereof; since the reinforcing vertical plate 2 104 can slide inside the reinforcing vertical plate 103 and waist holes 107 are arranged on the front and rear sides, the bolts 108 arranged on the front and rear sides of the reinforcing vertical plate 103 can be adjusted to firmly press against the inner wall of the waist hole 107, the length suitable for the building structure is selected and then the reinforcing vertical plate 2 104 is fixed.

[0031] Then, after the reinforcing horizontal plate 102, the reinforcing vertical plate 103 and the reinforcing vertical plate 204 are fixed to the building structure body 101, since the angle between the building structure body 101 is not fixed, the threaded rod 1 203 connected thereto can be driven to rotate by rotating the adjusting block 1 202. When the threaded rod 1 203 rotates, the threaded sleeve 204 threadedly connected thereto will move left and right along the direction of the threaded rod 1 203. When the threaded sleeve 204 moves, the sliders 209 arranged on the front and rear sides thereof will slide left and right inside the groove 205. The sliders 209 The left and right sliding drives the connecting telescopic rod 207 that is rotatably connected to it to move. Since the other end of the connecting telescopic rod 207 is rotatably connected to the reinforced vertical plate 104, and the side wall of the connecting telescopic rod 207 is also provided with a bolt 208 that can be used to control its telescopic length, the connecting telescopic rod 207 is set to a required length by adjusting the bolt 208. At the same time, a reinforced vertical plate fixing assembly 3 is provided between the reinforced horizontal plate 102 and the reinforced vertical plate 103, so that the angle between the reinforced horizontal plate 102 and the reinforced vertical plate 103 can be changed to adapt to different angles between building structures.

[0032] Finally, when the angle between the reinforcement vertical plate 103 and the reinforcement horizontal plate 102 is adjusted, in addition to fixing the angle between the reinforcement vertical plate 103 and the reinforcement horizontal plate 102 by the bolt 208 arranged on the side wall of the connecting telescopic rod 207, the angle can be further limited by the reinforcement vertical plate fixing assembly 3, and the rotation adjustment block 205 drives the threaded rod 204 fixedly connected thereto to rotate, because the threaded rod 204 is threadedly connected to the horizontal plate 103. When the threaded rod 204 rotates, it can drive the horizontal plate 103 and the connecting column 306 connected thereto to move downward, and the connecting column 306 moves downward to compress the spring 308 arranged on its outer surface, so that the top of the threaded rod 204 can press the outer wall of the rotating shaft 310, further fixing the angle between the reinforcement horizontal plate 102 and the reinforcement vertical plate 103, and realizing the reinforcement effect on the building structure.

[0033] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A building structure reinforcement device, comprising a building structure body (101), a reinforcement transverse plate (102) and a plurality of reinforcement plate fixing bolts (105), characterized in that: The top left side of the reinforcing transverse plate (102) is fixedly connected with an angle adjustment component (2), the top right side of the reinforcing transverse plate (102) is fixedly connected with two front-to-rear symmetrical reinforcing vertical plate fixing components (3), the two reinforcing vertical plate fixing components (3) are rotatably connected with a reinforcing vertical plate 1 (103) between the opposite side walls, the interior of the reinforcing vertical plate 1 (103) is hollow and the inner wall is slidably connected with a reinforcing vertical plate 2 (104), the front and rear sides of the reinforcing vertical plate 2 (104) are both provided with vertical waist holes (107), the tops of the front and rear sides of the reinforcing vertical plate 1 (103) are both threadedly connected with bolts 1 (108) through the threaded holes, the top four corners of the reinforcing transverse plate (102) are all provided with threaded holes and are fixed through reinforcing plates threadedly connected thereto. The bolts (105) are fixedly connected to the building structure body (101); the reinforcing horizontal plate (102) is fixedly connected to the building structure body (101) by means of a plurality of reinforcing plate fixing bolts (105); the upper end of the left side wall of the reinforcing vertical plate 2 (104) is provided with two front-to-back symmetrical threaded holes and is fixedly connected to the building structure body (101) by means of reinforcing plate fixing bolts (105) threadedly connected thereto; the lower end of the left side wall of the reinforcing vertical plate 1 (103) is provided with two front-to-back symmetrical threaded holes and is fixedly connected to the building structure body (101) by means of reinforcing plate fixing bolts (105) threadedly connected thereto; and the top of the left side wall of the reinforcing vertical plate 2 (104) is fixedly connected with two front-to-back symmetrical fixing blocks 1 (106).

2. A building structure reinforcement device according to claim 1, characterized in that: The angle adjustment assembly (2) comprises an adjustment frame (201) and an adjustment block 1 (202); two symmetrical grooves (205) are provided in the middle of the front and rear sides of the adjustment frame (201); four symmetrical fixing blocks 2 (206) are fixedly connected to the bottom of the front and rear side walls of the adjustment frame (201); the tops of the four fixing blocks 2 (206) are all provided with threaded holes and are fixedly connected to the reinforcing cross plate (102) by bolts threaded therewith; the right end of the adjustment block 1 (202) penetrates the left inner wall of the adjustment frame (201) and is fixedly connected to a threaded rod 1 (203); the outer end of the threaded rod 1 (203) is provided with a threaded hole. A threaded sleeve (204) is threadedly connected to the surface, and sliders (209) are fixedly connected to the front and rear sides of the threaded sleeve (204). The outer walls of the two sliders (209) are slidably connected to the grooves (205). The ends of the two sliders (209) that are away from each other respectively penetrate the front and rear outer walls of the adjustment frame (201) and are rotatably connected to two connecting telescopic rods (207). The middle parts of the two connecting telescopic rods (207) that are away from each other are threadedly connected to bolts 2 (208) through threaded holes provided therein, and the ends of the connecting telescopic rods (207) that are away from the sliders (209) are rotatably connected to fixed block 1 (106).

3. A building structure reinforcement device according to claim 2, characterized in that: The adjustment frame (201) is a hollow structure with an opening at the upper end, and the vertical height of the groove (205) is adapted to the diameter of the slider (209).

4. A building structure reinforcement device according to claim 1, characterized in that: The reinforcing vertical plate fixing assembly (3) comprises an L-shaped fixing plate (301), a bolt three (302) and an adjusting block two (305); a threaded hole is provided at the top of the front end protruding block of the L-shaped fixing plate (301) and is fixedly connected to the reinforcing horizontal plate (102) by means of a bolt three (302) threadedly connected thereto; a fixing block three (307) is fixedly connected to the top of the L-shaped fixing plate (301); two vertically symmetrical cylindrical sliding grooves are provided inside the fixing block three (307) and are slidably connected to a connecting column (306); the upper and lower ends of the two connecting columns (306) are respectively fixedly connected to the horizontal plate two (309). and a horizontal plate one (303), the upper ends of the outer surfaces of the two connecting columns (306) are provided with a spring (308) located between the horizontal plate two (309) and the fixed block three (307), the inner horizontal direction of the fixed block three (307) is provided with a cylindrical slide groove running forward and backward and is rotatably connected with a rotating shaft (310), the front and rear ends of the rotating shaft (310) respectively penetrate the front and rear sides of the reinforced vertical plate one (103) and are fixedly connected to the reinforced vertical plate one (103), and the top end of the adjusting block two (305) is fixedly connected with a threaded rod two (304) which penetrates the inner wall of the fixed block three (307) and is tightly fitted with the outer wall of the lower end of the rotating shaft (310).

5. A building structure reinforcement device according to claim 4, characterized in that: The upper and lower ends of the spring (308) are respectively fixedly connected to the bottom of the second horizontal plate (309) and the top of the third fixed block (307), and the second threaded rod (304) is threadedly connected to the threaded hole provided in the middle of the top of the first horizontal plate (303).

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