Concrete strength detection device

Abstract

The invention belongs to the technical field of concrete strength detection, particularly relates to a concrete strength detection device, and provides the following scheme aiming at the problem that equipment is easy to slide and deviate during punching and sampling: the concrete strength detection device comprises a base plate, and a drill hole is formed in the upper surface of the base plate close to the center; four supporting columns are evenly fixed to the position, close to the circumferential edge of the drilled hole, of the upper surface of the base plate, the positions, close to the middle, of the circumferential outer walls of the four supporting columns are slidably sleeved with the same first loading plate, and a driving source is fixed to the position, close to the middle, of the top end of the first loading plate. By arranging the supporting columns, it is ensured that the drilling machine moves on the fixed rail, the drilling machine is kept perpendicular to the ground all the time, the drilling machine is prevented from being subjected to deflection force, the stability of the drilling machine is improved, balanced stress of the drilling machine is ensured, unnecessary vibration and shaking are reduced, a drill bit can work more stably, the drilling efficiency is improved, and the service life of equipment is prolonged; and the operation safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete strength detection, and in particular to a concrete strength detection device. Background Art

[0002] Concrete is one of the main materials for building and infrastructure construction. It has high durability and compressive strength and can withstand long-term use and significant physical forces, which makes it an ideal choice for building long-lasting and safe buildings. From houses and public buildings to bridges, tunnels and roads, almost all large buildings and infrastructures need to use concrete. Concrete has an extremely important position and role in modern society; concrete strength testing is one of the important links in construction quality control. By regularly testing the strength of concrete, the quality of materials and the execution of construction processes during the construction process can be monitored, problems can be discovered and adjusted in a timely manner, and the project can be carried out according to the design requirements.

[0003] The rebound method is a commonly used concrete strength test method. During measurement, it is necessary to directly contact the concrete. However, when measuring concrete floors that have been tiled, the rebound method fails due to the influence of the tiles. The punching sampling method must be used to test the concrete strength. Due to the influence of the tiles, the equipment is prone to slide during drilling, resulting in deviation from the drilling range, posing a safety hazard. Therefore, we propose a concrete strength testing device. Summary of the invention

[0004] In order to solve the problem that equipment is easy to slide and deviate when drilling and sampling, the present invention provides a concrete strength detection device.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a concrete strength detection device, comprising a base plate, a bore hole is opened near the center of the upper surface of the base plate, and four support columns are evenly fixed on the upper surface of the base plate near the circumferential edge of the bore hole, the circumferential outer walls of the four support columns are slidably sleeved with the same first loading plate near the middle, and a driving source is fixed to the top of the first loading plate near the middle, the output shaft of the driving source passes through the first loading plate, and the output shaft of the driving source is connected to a transmission shaft through a coupling, a drilling rig is fixed to the circumferential outer wall of the transmission shaft near the bottom end, and the center of the drilling rig and the bore hole are in the same vertical plane.

[0006] A further configuration of the present invention is that a support plate is fixed to the top of the driving source, and a support spring is welded to the top of the support plate, the top of the support spring is welded to the support plate, and the top of the support plate is rotatably connected with a threaded column, the tops of the four support columns are fixed with the same second loading plate by bolts, and the threaded columns of the second loading plate are screwed together, and the tops of the threaded columns are clamped with a cross handle.

[0007] A further configuration of the present invention is that a scale is inserted and fixed on one side of the upper surface of the first loading plate, and the scale passes through the second loading plate.

[0008] A further configuration of the present invention is that a filter ring is welded to the upper surface of the substrate near the circumferential edge of the drill hole, and the inner wall of the filter ring is evenly provided with penetrating filter holes, a surrounding ring plate is fixed to the upper surface of the substrate near the circumferential outer wall of the filter ring, and the same air permeable ring is fixed to the top of the surrounding ring plate and the filter ring, and air permeable holes are evenly provided on the top of the air permeable ring, a sealing rubber sheet is fixed to the side of the top of the filter ring near the circumferential inner wall, and the circumferential inner wall of the sealing rubber sheet is adapted to the drilling rig.

[0009] A further configuration of the present invention is that a loading ring is slidably clamped at the gap between the filter ring and the surrounding ring plate, and a foam sponge is fixed to the bottom end of the loading ring, a fixing rod is evenly welded on the upper surface of the loading ring, and the fixing rod passes through the air ring, and circular holes are evenly opened on the upper surface of the loading ring, and a plurality of circular holes correspond to the air holes.

[0010] A further configuration of the present invention is that a rubber gasket is fixed to the lower surface of the substrate near the edge of the circumferential inner wall of the drill hole.

[0011] A further configuration of the present invention is that an adsorption mechanism is installed on the lower surface of the substrate near the four corners, and the adsorption mechanism includes a negative pressure fixing bolt, the upper surface of the substrate is screwed with negative pressure fixing bolts near the four corners, and a knob plate is welded to the top of the negative pressure fixing bolt, an outer hollow tube is welded to the bottom end of the negative pressure fixing bolt, and a bearing is clamped on the circumferential inner wall of the outer hollow tube, a loading column is inserted into the circumferential inner wall of the bearing, and a negative pressure sliding disk is fixed to the bottom end of the loading column, a loading tube is fixed to the bottom end of the substrate near the circumferential outer wall of the negative pressure fixing bolt, and the circumferential inner wall of the loading tube and the circumferential outer wall of the negative pressure sliding disk are sealed.

[0012] A further configuration of the present invention is that a hollow rubber tube is sleeved and fixed on the circumferential outer wall of the loading tube, and a negative pressure suction cup is sealed at the bottom end of the hollow rubber tube.

[0013] A further configuration of the present invention is that a balancing mechanism is installed on both sides of the substrate, and the balancing mechanism includes a support block 2, a pair of support blocks 2 are welded on the upper surface of the substrate near both sides, and the adjacent sides of a pair of support blocks 2 on the same side are rotatably connected to the same rotating shaft, the circumferential outer wall of the rotating shaft is rotatably connected to a bushing, a support arm is welded on the side of the circumferential outer wall of the bushing away from the drilling rig, and a downwardly inclined rocker is welded on the side of the circumferential outer wall of the bushing close to the drilling rig, a pressure dividing arm is fixed by bolts on the side of the support arm away from the rotating shaft, and adjustment rods are screwed on the upper surface of the pressure dividing arm near both ends.

[0014] A further arrangement of the present invention is that the bottom ends of the several adjusting rods are rotatably connected to loading blocks, and the same wheel axle is inserted into the outer walls on both sides of the loading blocks, and the circumferential outer walls of the wheel axle are rotatably connected to rollers, a pair of support blocks 1 are welded to the upper surface of the base plate near the seesaws on both sides, and the top ends of the pair of support blocks 1 on the same side are fixed to the same support plate by bolts, the top end of the support plate is screwed with a limiting column near the center, and the bottom end of the limiting column is rotatably connected to a rope block, a pull rope is fixed to the middle of the bottom end of the rope block, and the end of the pull rope away from the rope block is connected to the seesaw.

[0015] In summary, the beneficial effects of this solution are:

[0016] 1. By setting up four support columns, ensure that the drilling rig moves on a fixed track, keep the drilling rig vertical to the ground at all times, avoid the drilling rig being subjected to deflection force, improve the stability of the drilling rig, ensure that the drilling rig is balanced, reduce unnecessary vibration and shaking, enable the drill bit to work more stably, improve drilling efficiency, extend the service life of the equipment, and improve operational safety.

[0017] 2. By setting a support spring, when the support spring is compressed, a continuous vertical downward force can be provided to the driving source, further improving the stability of the drilling rig. Under the same support spring force time, by comparing the drilling depth of the drilling rig, the relative strength of different concretes can be obtained.

[0018] 3. By setting up a breathable ring, the dust stirred up by the drilling rig can be reduced, the working environment and working conditions of the staff can be improved, and work interruptions or delays caused by dust interference can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the front-end structure of a concrete strength detection device proposed by the present invention;

[0020] Figure 2 A side schematic diagram of a concrete strength detection device proposed by the present invention;

[0021] Figure 3 This is a schematic diagram of the bottom structure of a concrete strength detection device proposed by the present invention;

[0022] Figure 4 A schematic cross-sectional structure diagram of a concrete strength detection device proposed by the present invention;

[0023] Figure 5 A concrete strength detection device proposed by the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 6A schematic cross-sectional structure diagram of an adsorption mechanism of a concrete strength detection device proposed by the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of a balancing mechanism of a concrete strength detection device proposed by the present invention.

[0026] In the figure: 1, base plate; 2, surrounding ring plate; 3, negative pressure fixing bolt; 4, support arm; 5, support column; 6, first loading plate; 7, second loading plate; 8, threaded column; 9, support spring; 10, driving source; 11, drilling rig; 12, air ring; 1201, air hole; 13, cross handle; 14, scale; 15, support plate; 16, sealing rubber sheet; 17, negative pressure suction cup; 18, filter ring; 19, rubber gasket; 20, foam sponge; 21, loading ring; 22 , filter hole; 23, transmission shaft; 24, fixing rod; 25, knob plate; 26, hollow rubber tube; 27, outer hollow tube; 28, negative pressure slide plate; 29, loading column; 30, bearing; 31, loading tube; 32, pressure dividing arm; 33, bushing; 34, support block one; 35, support plate; 36, rope block; 37, limit column; 38, rotating shaft; 39, roller; 40, axle; 41, loading block; 42, support block two; 43, adjustment rod; 44, pull rope; 45, seesaw. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In this embodiment, refer to Figure 1-7 A concrete strength detection device comprises a base plate 1, a bore hole is formed on the upper surface of the base plate 1 near the center, and four support columns 5 are evenly fixed on the upper surface of the base plate 1 near the circumferential edge of the bore hole, the circumferential outer walls of the four support columns 5 are slidably sleeved with the same first loading plate 6 near the middle, and a driving source 10 is fixed on the top of the first loading plate 6 near the middle, the output shaft of the driving source 10 passes through the first loading plate 6, and the output shaft of the driving source 10 is connected to a transmission shaft 23 through a coupling, a drilling rig 11 is fixed on the circumferential outer wall of the transmission shaft 23 near the bottom end, and the center of the drilling rig 11 and the bore hole are in the same vertical plane; by setting the four support columns 5, it is ensured that the drilling rig 11 moves on a fixed track, so that the drilling rig 11 is always kept vertical to the ground, the drilling rig 11 is prevented from being subjected to a deflection force, the stability of the drilling rig 11 is improved, the drilling rig 11 is ensured to be balanced, unnecessary vibration and shaking are reduced, the drill bit can work more stably, the drilling efficiency is improved, the service life of the equipment is extended, and the operation safety is improved.

[0029] refer to Figure 1A support plate 15 is fixed to the top of the driving source 10, and a support spring 9 is welded to the top of the support plate 15, and a support plate 15 is welded to the top of the support spring 9, and a threaded column 8 is rotatably connected to the top of the support plate 15. The tops of the four support columns 5 are fixed with the same second loading plate 7 by bolts, and the threaded columns 8 of the second loading plate 7 are screwed together, and a cross handle 13 is clamped on the top of the threaded column 8; by arranging the support spring 9, when the support spring 9 is compressed, a continuous vertical downward force can be provided for the driving source 10, thereby further improving the stability of the drilling rig 11. Under the same force and time of the support spring 9, the drilling depth of the drilling rig 11 can be compared, and the relative strength of different concretes can be obtained.

[0030] refer to Figure 2 A scale 14 is inserted and fixed on the upper surface of the first loading plate 6 near one side, and the scale 14 passes through the second loading plate 7; by setting the scale 14, it can be ensured that the support springs 9 of the same length are compressed, ensuring that the force exerted on the drilling rig 11 is the same during each inspection. At the same time, the drilling depth can be recorded, which is convenient for comparing the strength of the corresponding concrete.

[0031] refer to Figure 3 , Figure 7 A filter ring 18 is welded on the upper surface of the substrate 1 near the circumferential edge of the drill hole, and the inner wall of the filter ring 18 is uniformly provided with penetrating filter holes 22. A surrounding ring plate 2 is fixed on the upper surface of the substrate 1 near the circumferential outer wall of the filter ring 18, and the same air-permeable ring 12 is fixed to the top of the surrounding ring plate 2 and the filter ring 18, and the top of the air-permeable ring 12 is uniformly provided with air holes 1201, and a sealing rubber sheet 16 is fixed on one side of the top of the filter ring 18 near the circumferential inner wall, and the circumferential inner wall of the sealing rubber sheet 16 is adapted to the drilling rig 11; by providing the air-permeable ring 12, the dust stirred up by the drilling rig 11 when working can be reduced, the working environment and working conditions of the staff can be improved, and the work interruption or delay caused by dust interference can be reduced.

[0032] refer to Figure 5 A loading ring 21 is slidably connected at the gap between the filter ring 18 and the surrounding ring plate 2, and a foam sponge 20 is fixed to the bottom end of the loading ring 21. A fixing rod 24 is evenly welded on the upper surface of the loading ring 21, and the fixing rod 24 passes through the air-permeable ring 12. Circular holes are evenly opened on the upper surface of the loading ring 21, and a plurality of circular holes correspond to the air-permeable holes 1201. By arranging the foam sponge 20, the foam sponge 20 absorbs a certain amount of water, which can reduce the escape of dust, and the foam sponge 20 is squeezed to inject water into the borehole. The lubricity of water can reduce the friction and wear of the drill bit in the concrete, thereby extending the service life of the drill bit. Water injection also helps to cool the drill bit and drilling parts to prevent them from overheating. Maintaining an appropriate working temperature can improve the efficiency and speed of drilling.

[0033] refer to Figure 3A rubber gasket 19 is fixed to the lower surface of the substrate 1 at the edge of the circumferential inner wall near the drill hole; by setting the rubber gasket 19, the rubber gasket 19 has excellent elasticity and shock absorption ability, which can effectively reduce the vibration and impact generated during the operation of the machine, help protect the equipment itself and the surrounding structures from the impact of vibration, extend the service life of the equipment and buildings, and reduce noise.

[0034] refer to Figure 6 The lower surface of the substrate 1 is provided with an adsorption mechanism near the four corners, and the adsorption mechanism includes a negative pressure fixing bolt 3, the upper surface of the substrate 1 is screwed with a negative pressure fixing bolt 3 near the four corners, and the top of the negative pressure fixing bolt 3 is welded with a knob plate 25, the bottom end of the negative pressure fixing bolt 3 is welded with an outer hollow tube 27, and the circumferential inner wall of the outer hollow tube 27 is clamped with a bearing 30, the circumferential inner wall of the bearing 30 is plugged with a loading column 29, and the bottom end of the loading column 29 is fixed with a negative pressure sliding plate 2 8. A loading tube 31 is fixed to the bottom end of the base plate 1 near the circumferential outer wall of the negative pressure fixing bolt 3, and the circumferential inner wall of the loading tube 31 is sealed with the circumferential outer wall of the negative pressure sliding plate 28. A hollow rubber tube 26 is sleeved and fixed to the circumferential outer wall of the loading tube 31, and the bottom end of the hollow rubber tube 26 is sealed with a negative pressure suction cup 17. By providing the negative pressure suction cup 17, it can be ensured that the device fits tightly to the tile floor, avoid displacement of the device, and improve the stability of the device during operation.

[0035] refer to Figure 7 A balancing mechanism is installed on both sides of the substrate 1, and the balancing mechanism includes a supporting block 42. A pair of supporting blocks 42 are welded near both sides of the upper surface of the substrate 1, and the adjacent sides of the pair of supporting blocks 42 on the same side are rotatably connected to the same rotating shaft 38, and the circumferential outer wall of the rotating shaft 38 is rotatably connected to the sleeve 33, and the circumferential outer wall of the sleeve 33 is welded with a supporting arm 4 on the side away from the drilling rig 11, and the circumferential outer wall of the sleeve 33 is welded with a downwardly inclined rocker 45 on the side close to the drilling rig 11, and the side of the supporting arm 4 away from the rotating shaft 38 is fixed with a pressure dividing arm 32 by bolts, and the upper surface of the pressure dividing arm 32 is screwed with an adjusting rod 43 near both ends; Notice that the adjusting rod 43 is set, and when the ground is uneven, the screw connection length of the adjusting rod 43 is changed to ensure that the bottom end of each adjusting rod 43 touches the ground to prevent the device from tilting and shaking, thereby further improving the operating stability of the device.

[0036] refer to Figure 7The bottom ends of the plurality of adjusting rods 43 are rotatably connected to the loading blocks 41, and the same wheel axle 40 is inserted into the outer walls on both sides of the loading blocks 41, and the circumferential outer walls of the wheel axle 40 are rotatably connected to the rollers 39. A pair of support blocks 34 are welded to the upper surface of the base plate 1 near the seesaws 45 on both sides, and the top ends of the pair of support blocks 34 on the same side are fixed with the same support plate 35 by bolts, and the top ends of the support plates 35 are screwed with the limiting column 37 near the center, and the bottom ends of the limiting columns 37 are rotatably connected to the rope block 36, and a pull rope 44 is fixed to the middle part of the bottom end of the rope block 36, and the end of the pull rope 44 away from the rope block 36 is connected to the seesaw 45; by setting the rollers 39, it is convenient to move the device, which increases the scope of use of the device. It can be used at different construction sites anytime and anywhere, which is helpful for real-time monitoring and control of the quality of concrete.

[0037] When the present invention is in use: when the strength of concrete in a specific area is tested, first the limit column 37 is rotated to lift the rope block 36, so that the seesaw 45 is lifted upward, the pressure dividing arm 32 is lowered, the roller 39 touches the ground, and the device is pushed to the area to be tested; then the adjustment rod 43 is rotated to ensure that each roller 39 can touch the ground at the same time, and each negative pressure suction cup 17 touches the ground at the same time, and then the negative pressure fixing bolt 3 is rotated to form a negative pressure environment at the gap between the negative pressure suction cup 17 and the negative pressure sliding plate 28, so as to ensure that the negative pressure suction cup 17 is stably adsorbed on the tile floor; then the threaded column 8 is rotated to compress the support spring 9 to a specific length, and the driving source 10 is started. The driving source 10 drives the drilling rig 11, and the drilling rig 11 is subjected to the downward force of the supporting spring 9 to start drilling the concrete core sample; when drilling is difficult, water is injected into the foam sponge 20, and then the fixing rods 24 are pressed to move the loading ring 21 downward, compress the foam sponge 20, and make water flow into the borehole, thereby improving the drilling efficiency.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concrete strength detection device, comprising a substrate (1), characterized in that: A borehole is formed near the center of the upper surface of the substrate (1), and four support columns (5) are evenly fixed on the upper surface of the substrate (1) near the circumferential edge of the borehole; the circumferential outer walls of the four support columns (5) are slidably sleeved with a first loading plate (6) near the middle, and a driving source (10) is fixed at the top of the first loading plate (6) near the middle, the output shaft of the driving source (10) passes through the first loading plate (6), and the output shaft of the driving source (10) is connected to a transmission shaft (23) via a coupling, and a drilling machine (11) is fixed on the circumferential outer wall of the transmission shaft (23) near the bottom, and the center of the drilling machine (11) and the borehole are in the same vertical plane.

2. A concrete strength detection device according to claim 1, characterized in that: A support disc (15) is fixed to the top of the driving source (10), and a support spring (9) is welded to the top of the support disc (15), and a support disc (15) is welded to the top of the support spring (9), and a threaded column (8) is rotatably connected to the top of the support disc (15), and the top of the four support columns (5) are fixed to the same second loading plate (7) by bolts, and the threaded columns (8) of the second loading plate (7) are screwed together, and a cross handle (13) is clamped to the top of the threaded column (8).

3. A concrete strength detection device according to claim 2, characterized in that: A scale (14) is inserted and fixed on one side of the upper surface of the first loading plate (6), and the scale (14) passes through the second loading plate (7).

4. A concrete strength detection device according to claim 1, characterized in that: A filter ring (18) is welded to the upper surface of the substrate (1) near the circumferential edge of the drill hole, and the inner wall of the filter ring (18) is uniformly provided with filter holes (22) extending therethrough. A surrounding ring plate (2) is fixed to the upper surface of the substrate (1) near the circumferential outer wall of the filter ring (18), and the same air permeable ring (12) is fixed to the top ends of the surrounding ring plate (2) and the filter ring (18), and the top ends of the air permeable ring (12) are uniformly provided with air permeable holes (1201). A sealing rubber sheet (16) is fixed to the top end of the filter ring (18) near the circumferential inner wall, and the circumferential inner wall of the sealing rubber sheet (16) is adapted to the drilling rig (11).

5. A concrete strength detection device according to claim 4, characterized in that: A loading ring (21) is slidably engaged at the gap between the filter ring (18) and the surrounding ring plate (2), and a foam sponge (20) is fixed to the bottom end of the loading ring (21). A fixing rod (24) is evenly welded to the upper surface of the loading ring (21), and the fixing rod (24) passes through the air-permeable ring (12). Circular holes are evenly opened on the upper surface of the loading ring (21), and a plurality of circular holes correspond to the air-permeable holes (1201).

6. A concrete strength detection device according to claim 1, characterized in that: A rubber gasket (19) is fixed on the lower surface of the base plate (1) near the edge of the circumferential inner wall of the drilled hole.

7. A concrete strength detection device according to claim 1, characterized in that: Adsorption mechanisms are installed near the four corners of the lower surface of the substrate (1), and the adsorption mechanisms include negative pressure fixing bolts (3); negative pressure fixing bolts (3) are screwed near the four corners of the upper surface of the substrate (1), and a knob plate (25) is welded to the top of the negative pressure fixing bolt (3); an outer hollow tube (27) is welded to the bottom end of the negative pressure fixing bolt (3), and a bearing (30) is clamped on the circumferential inner wall of the outer hollow tube (27); a loading column (29) is inserted into the circumferential inner wall of the bearing (30), and a negative pressure sliding disk (28) is fixed to the bottom end of the loading column (29); a loading tube (31) is fixed to the bottom end of the substrate (1) near the circumferential outer wall of the negative pressure fixing bolt (3), and the circumferential inner wall of the loading tube (31) and the circumferential outer wall of the negative pressure sliding disk (28) are sealed.

8. A concrete strength detection device according to claim 7, characterized in that: A hollow rubber tube (26) is sleeved and fixed on the circumferential outer wall of the loading tube (31), and a negative pressure suction cup (17) is sealed at the bottom end of the hollow rubber tube (26).

9. A concrete strength detection device according to claim 1, characterized in that: A balancing mechanism is installed on both sides of the base plate (1), and the balancing mechanism comprises a second supporting block (42). A pair of second supporting blocks (42) are welded to the upper surface of the base plate (1) near both sides, and the adjacent sides of the pair of second supporting blocks (42) on the same side are rotatably connected to the same rotating shaft (38). The circumferential outer wall of the rotating shaft (38) is rotatably connected to a shaft sleeve (33). A support arm (4) is welded to the side of the circumferential outer wall of the shaft sleeve (33) away from the drilling rig (11), and a downwardly inclined rocker plate (45) is welded to the side of the circumferential outer wall of the shaft sleeve (33) close to the drilling rig (11). A pressure dividing arm (32) is fixed to the side of the support arm (4) away from the rotating shaft (38) by bolts, and an adjusting rod (43) is screwed to the upper surface of the pressure dividing arm (32) near both ends.

10. A concrete strength detection device according to claim 9, characterized in that: The bottom ends of the plurality of adjusting rods (43) are rotatably connected to loading blocks (41), and the outer walls on both sides of the loading blocks (41) are plugged with a same axle (40), and the circumferential outer wall of the axle (40) is rotatably connected to a roller (39), and a pair of support blocks (34) are welded to the upper surface of the base plate (1) near the seesaws (45) on both sides, and the top ends of the pair of support blocks (34) on the same side are fixed to the same support plate (35) by bolts, and the top end of the support plate (35) is screwed to a limiting column (37) near the center, and the bottom end of the limiting column (37) is rotatably connected to a rope block (36), and a pull rope (44) is fixed to the middle of the bottom end of the rope block (36), and the end of the pull rope (44) away from the rope block (36) is connected to the seesaw (45).

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