A building construction detection and identification field test device

Abstract

The application provides a housing construction detection and identification field test device, which has the structure comprising: a first wheel set, a second wheel set, a parallel plate, a control screen, an ultrasonic main body and an auxiliary structure; the first wheel set and the second wheel set are installed at the corner positions of the parallel plate, and the control screen at the upper end of the parallel plate controls the ultrasonic main body; the auxiliary structure arranged at the edge of the ultrasonic main body is used as the basis, the edge of the ultrasonic main body is first restrained by the restraining block of the second supporting body, then the other end of the edge of the ultrasonic main body is pressed and fixed by the reinforcing structure of the first supporting body, so that the stability of the ultrasonic main body during the single-point measurement operation of the extension by the control screen is ensured, and the stability effect during the connection measurement operation of the first wheel set and the second wheel set driven by the pushing piece is ensured, the noise caused by the large deviation of point-to-point is avoided, and the measurement accuracy is reduced, and therefore the actual use effect of the test device is improved.

Description

Technical Field

[0001] This invention relates to the field of building inspection and assessment technology, and more specifically to a field testing device for building inspection and assessment. Background Technology

[0002] Building inspection and assessment is a systematic and professional process aimed at scientifically evaluating the current condition, safety, and reliability of a building. This process utilizes specialized on-site testing equipment to examine and assess various safety indicators. These equipment includes rebound hammers (for testing concrete strength), rebar scanners (for detecting rebar location, diameter, and protective layer thickness), total stations and levels (for measuring building tilt and settlement), and ultrasonic radar (for detecting internal voids and cracks). This effectively ensures the safety and reliability of the building after construction, preventing unnecessary safety hazards and improving stability when the building is inhabited. In summary, the inventors have found that existing field testing devices (ultrasonic radar) have the following main defects: Since the current field testing devices are based on ultrasonic radar, when detecting parallel walls of a house, the operator needs to hold the radar and make parallel contact with the wall. This causes inconvenience when detecting large areas of walls and makes it difficult to perform continuous large-area detection, which reduces the actual effectiveness of the current field testing devices. Furthermore, when performing single-point measurements on a wall, it is necessary to ensure the stability of the ultrasonic probe and prevent it from shaking, otherwise noise will occur. Therefore, when the operator holds the probe for single-point measurement, it is very difficult to maintain it in the air, which can easily lead to deviations in single-point measurements, resulting in noise and inaccurate data. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical objective is: a field test device for building inspection and appraisal, the structure of which includes: a first wheel group, a second wheel group, a parallel plate, a control screen, an ultrasonic body, and an auxiliary structure. The first wheel group and the second wheel group are installed at the corners of the parallel plate, and the control screen at the upper end of the parallel plate controls the ultrasonic body. The edge of the ultrasonic body is restrained by the auxiliary structure.

[0004] As a further improvement of the present invention, the auxiliary structure is provided with a first support body and a second support body. The lower ends of the first support body and the second support body are provided with welding ends. The second support body is externally connected to a clamping block and equipped with a pushing component. The second support body is internally provided with a restraining block.

[0005] As a further improvement of the present invention, the first support body is also provided with a solid block, which is integrated with the contact layer. The contact layer is connected with a positioning block and a support rod, and a reinforcing structure is provided in the spacing between the support rods.

[0006] As a further improvement of the present invention, the telescopic rod carried by the ultrasonic body is controlled by the control panel to make the probe contact the wall. At the same time, the ultrasonic body, combined with the restraining block of the second support of the auxiliary structure and the reinforcement structure of the first support, is forcibly fixed to the surface of the parallel plate. Then, the first wheel group and the second wheel group are driven to move horizontally by the external pushing component of the second support, which forces the probe of the ultrasonic body to move steadily horizontally on the wall to perform continuous measurement or single-point fixed measurement.

[0007] As a further improvement of the present invention, the first wheel set and the second wheel set are arranged in four directions at the corners of the parallel plate, the control screen and the ultrasonic body on the parallel plate are set in a vertical direction, and the auxiliary structure is arranged symmetrically at the edge of the ultrasonic body. The ultrasonic body includes a telescopic rod and an ultrasonic probe.

[0008] As a further improvement of the present invention, the first support body and the second support body are welded and fixed to the surface of the parallel plate through the welding end. The clamping block of the second support body is set in a symmetrical position to determine the position of the pushing member. The restraining block of the second support body is a raised solid shape that inserts and restrains one edge of the ultrasonic body.

[0009] As a further improvement of the present invention, the solid block is "L" shaped and overlaps with the other end of the ultrasonic body through a parallel contact layer. The positioning block determines the position of the support rod on the contact layer and sets it in a vertical orientation. The support rod is equipped with three sets of reinforcement structures to clamp and reinforce one end of the edge of the ultrasonic body.

[0010] As a further improvement of the present invention, the reinforcement structure is provided with a protective plate. One end of the protective plate is parallel to the surface of the built-in block, and slots are opened at the center of the upper and lower edges of the built-in block. A protrusion is provided at the center of the built-in block, and an external block is connected to the other end of the protrusion. A bolt is provided at the center of the external block, and the bolt passes through the protrusion and the built-in block to control the protective plate.

[0011] As a further improvement of the present invention, the protective plate is parallel in shape, and the inner block and the outer block are respectively disposed on the inner and outer sides of the contact layer. The protective plate clamps and fixes one end of the edge of the ultrasonic body by rotating the bolt. One end of the protrusion of the inner block is inserted into the center of the outer block so that the bolt rotates in the center.

[0012] As a further improvement of the present invention, the protective plate is also provided with a silicone plate, one end of which is provided with a solid plate, and the other side of the solid plate is connected to a central block and a rotating sleeve is connected to the center of the central block.

[0013] As a further improvement of the present invention, the silicone plate and the solid plate are parallel to each other and integrated into one piece. The central block of the solid plate is convex and the rotating sleeve is embedded in the center of the built-in block and fixedly connected with the bolt.

[0014] As a further improvement of the present invention, the second wheel set is provided with a bottom block, and a restraining structure is connected to the center of the bottom block. The position of the pulley is determined by a connecting block at the lower center of the bottom block. The restraining structure passes through the center of the bottom block and fits into the connecting block and the position of the pulley.

[0015] As a further improvement of the present invention, the bottom block is vertical and intersects with the restraining structure. The restraining structure slides up and down at the center of the bottom block to cover and clamp the connecting block and the outer edge of the pulley at the lower end of the bottom block.

[0016] As a further improvement of the present invention, the restraining structure is further provided with a pull block, the lower end of the pull block is connected to a force-bearing block, the lower end of the force-bearing block is connected to a vertical sleeve, and the lower end of the vertical sleeve is connected to a cylindrical sleeve.

[0017] As a further improvement of the present invention, the pull block and the force-bearing block are on the same vertical line, and the vertical sleeve and cylindrical sleeve at the lower end of the force-bearing block are penetrated by the connecting block and the pulley, and the cylindrical sleeve contacts and clamps the edge of the pulley.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention is based on an auxiliary structure set at the edge of the ultrasonic body. First, the restraining block of the second support body restrains one end of the edge of the ultrasonic body. Then, the reinforcing structure of the first support body presses and fixes the other end of the edge of the ultrasonic body. This makes the ultrasonic body stable when extending to perform single-point measurement through the control screen. At the same time, it also improves the stability when the first and second wheel sets are driven by the pusher to perform line measurement. This avoids noise caused by large point-to-point offset and reduced measurement accuracy, thus improving the actual use effect of the test device.

[0019] 2. This invention improves upon the reinforcement structure of the second support body by ensuring the linear positioning of the protrusions and bolts through the stable installation of the inner and outer blocks on the contact layer of the solid block. Then, the movement of the protective plate driven by the bolts utilizes the self-locking properties of the threads to enhance the pressing and fixing strength of the ultrasonic body edge, preventing loosening. At the same time, the silicone plate of the protective plate helps prevent damage to the ultrasonic body edge during pressing and reinforcement. Therefore, this further improves the stability of the test device and the convenience of disassembling the ultrasonic body from the auxiliary structure.

[0020] 3. The present invention, after the improvement of the No. 2 wheel group, can keep the restraining structure and the pulley on the same vertical line by the position restraint of the bottom block. Then, when performing single-point measurement, the force block of the restraining structure can be pressed down, forcing the vertical sleeve and the cylindrical sleeve to cover the connecting block and the outer edge of the pulley. Subsequently, the rubber rebound effect of the cylindrical sleeve can clamp and limit the pulley, avoiding automatic displacement during single-point measurement, thus further improving the use effect of the test device. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a field testing device for building inspection and assessment.

[0022] Figure 2 This is a three-dimensional structural diagram of an improved auxiliary structure.

[0023] Figure 3 This is a cross-sectional structural diagram of an improved No. 1 support.

[0024] Figure 4 This is a three-dimensional structural diagram of an improved reinforced structure.

[0025] Figure 5 This is a three-dimensional structural diagram of an improved protective plate.

[0026] Figure 6 This is a three-dimensional structural diagram of an improved No. 2 wheel set.

[0027] Figure 7 This is a three-dimensional structural diagram of an improved restraint structure.

[0028] In the diagram: Wheel set 1, Wheel set 2, Parallel plate, Control panel, Ultrasonic body, Auxiliary structure; Welding end-61, No. 1 support-62, No. 2 support-63, clamping block-64, pushing component-65, restraining block-66; Solid block-621, contact layer-622, positioning block-623, support rod-624, reinforcement structure-625; Protective plate-6251, built-in block-6252, slot-6253, protrusion-6254, external block-6255, bolt-6256; Silicone plate-2511, solid plate-2512, center block-2513, rotating sleeve-2514; Bottom block-21, restraint structure-22, connecting block-23, pulley-24; Pull block-221, force block-222, vertical sleeve-223, cylindrical sleeve-224. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings: Example 1: Figures 1 to 5 As shown: This invention provides a field testing device for building inspection and assessment. Its structure includes: a first wheel set 1, a second wheel set 2, a parallel plate 3, a control screen 4, an ultrasonic body 5, and an auxiliary structure 6. The first wheel set 1 and the second wheel set 2 are installed at the corners of the parallel plate 3, and the control screen 4 at the upper end of the parallel plate 3 controls the ultrasonic body 5. The edge of the ultrasonic body 5 is restrained by the auxiliary structure 6.

[0030] The auxiliary structure 6 includes a first support body 62 and a second support body 63. Both the first support body 62 and the second support body 63 have a welding end 61 at their lower ends. The second support body 63 is externally connected to a clamping block 64 and is equipped with a pushing component 65. The second support body 63 is internally equipped with a restraining block 66.

[0031] The first support body 62 is also provided with a solid block 621, which is integrated with the contact layer 622. The contact layer 622 is connected with a positioning block 623 and a support rod 624. A reinforcing structure 625 is provided in the spacing of the support rods 624.

[0032] In this system, the telescopic rod carried by the ultrasonic main body 5 is controlled by the control panel 4 to make the probe contact the wall. At the same time, the ultrasonic main body 5 is forcibly fixed to the surface of the parallel plate 3 by the restraining block 66 of the second support body 63 of the auxiliary structure 6 and the reinforcing structure 625 of the first support body 62. Then, the first wheel group 1 and the second wheel group 2 are driven to move horizontally by the external pushing part 65 of the second support body 63, which forces the probe of the ultrasonic main body 5 to move steadily horizontally on the wall for continuous measurement or single-point fixed measurement.

[0033] Among them, the first wheel group 1 and the second wheel group 2 are arranged in four directions at the corners of the parallel plate 3. The control screen 4 and the ultrasonic body 5 on the parallel plate 3 are set in a vertical direction. The auxiliary structure 6 is arranged in a symmetrical direction at the edge of the ultrasonic body 5. The ultrasonic body 5 includes a telescopic rod and an ultrasonic probe.

[0034] The first support body 62 and the second support body 63 are welded and fixed to the surface of the parallel plate 3 through the welding end 61. The clamping block 64 of the second support body 63 is set in a symmetrical position and determines the position of the pusher 65. The restraining block 66 of the second support body 63 is a raised solid shape that inserts and restrains one edge of the ultrasonic body 5.

[0035] The solid block 621 is L-shaped and overlaps with the other end of the ultrasonic body 5 through the parallel contact layer 622. The positioning block 623 determines the position of the support rod 624 on the contact layer 622 and sets it in a vertical orientation. The support rod 624 is equipped with three sets of reinforcing structures 625 to clamp and reinforce one edge of the ultrasonic body 5.

[0036] The reinforcement structure 625 includes a protective plate 6251. One end of the protective plate 6251 is parallel to the surface of the built-in block 6252, and slots 6253 are opened at the center of the upper and lower edges of the built-in block 6252. A protrusion 6254 is provided at the center of the built-in block 6252, and an external block 6255 is connected to the other end of the protrusion 6254. A bolt 6256 is provided at the center of the external block 6255, and the bolt 6256 passes through the protrusion 6254 and the built-in block 6252 to control the protective plate 6251.

[0037] The protective plate 6251 is parallel in shape. The inner block 6252 and the outer block 6255 are respectively disposed on the inner and outer sides of the contact layer 622. The protective plate 6251 clamps and fixes one edge of the ultrasonic body 5 by rotating the bolt 6256. One end of the protrusion 6254 of the inner block 6252 is inserted into the center of the outer block 6255, allowing the bolt 6256 to rotate in the center.

[0038] The protective plate 6251 is further provided with a silicone plate 2511. One end of the silicone plate 2511 is provided with a solid plate 2512. The other side of the solid plate 2512 is connected to a central block 2513, and a rotating sleeve 2514 is connected to the center of the central block 2513.

[0039] The silicone plate 2511 and the solid plate 2512 are parallel to each other and integrated. The central block 2513 of the solid plate 2512 is convex and the rotating sleeve 2514 is embedded in the center of the built-in block 6252 and fixedly connected with the bolt 6256.

[0040] The specific functions and operation procedures of this embodiment are as follows: In this invention, the on-site testing device for building inspection and assessment can be divided into several types, including a rebound hammer, a rebar scanner, a total station, a level, and an ultrasonic radar. This allows for on-site inspection and assessment of various locations within a building. Therefore, this invention is based on ultrasonic radar. The parallel plate 3 determines the positions of wheel set 1 and wheel set 2. Then, the control panel 4 electrically controls the ultrasonic main body 5. The telescopic rod within the ultrasonic main body 5 extends the ultrasonic probe to contact the wall surface, subsequently performing wall inspection. The ultrasonic probe applies a short, high-frequency mechanical impact (generating a stress wave) to the wall surface, while a receiving probe receives the waves reflected from within the material. The received waves convert the mechanical vibration into electrical signals, allowing analysis of the reflected wave's "arrival time" and "amplitude (intensity)." The frequency components indicate that if a strong reflected signal is received from the concrete / air interface and its arrival time is earlier than the reflected signal from the back of the structure, it indicates an internal defect. Therefore, the detection and identification of the house wall can be completed. At the same time, the signal and waveform will be displayed on the control screen 4 for easy observation. When the ultrasonic body 5 is working, the edge auxiliary structure 6 can be used for vertical restraint and reinforcement to prevent the ultrasonic body 5 from shaking and causing inaccurate detection and noise. For this purpose, the first support body 62 and the second support body 63 of the auxiliary structure 6 are welded to the surface of the parallel plate 3 through the lower welding end 61. At the same time, the external clamping block 64 of the second support body 63 determines the position of the pushing part 65, so that the pusher can drive the first wheel group 1 and the second wheel group 2 to move through the pushing part 65, so that the ultrasonic body 5 can perform continuous detection on the house wall. During the process, the restraint block 66 of the second support body 63 can be used to position one end of the edge of the ultrasonic body 5. At the same time, the solid block 621 of the first support body 62 can be connected through the contact layer 62. 2. Contact is made with the other end of the edge of the ultrasonic body 5, and then the edge of the ultrasonic body 5 is pressed and fixed by the reinforcing structure 625 defined by the positioning block 623 and the support rod 624, ensuring that there will be no shaking or positional error during continuous testing, thus improving the actual use effect of the device. Subsequently, the inner block 6252 and the outer block 6255 of the reinforcing structure 625 are respectively installed on the inner and outer walls of the contact layer 622, and the center point is restrained and overlapped and fixed by the protrusion 6254, so that the outer block 6252 can be used to fix the edge of the ultrasonic body 5. The bolt 6256 of 255 rotates linearly through the protrusion 6254 and the central control protection plate 6251 of the built-in block 6252, which moves horizontally. The solid plate 2512 of the protection plate 6251 can rotate the bolt 6256 through the rotating sleeve 2514 of the central block 2513. Finally, the silicone plate 2511 contacts the edge of the ultrasonic body 5. Then, the self-locking property of the bolt 6256 is used to complete the pressing and fixing effect, avoiding loosening. This improves the stability of the device and further improves the accuracy of the device during measurement.

[0041] Example 2: Figures 6 to 7 As shown: This invention provides a field testing device for building inspection and assessment. Its structure includes a base block 21, a restraining structure 22 connected to the center of the base block 21, and the position of the pulley 24 determined by the connecting block 23 at the lower center of the base block 21. The restraining structure 22 passes through the center of the base block 21 and fits into the position of the connecting block 23 and the pulley 24.

[0042] The bottom block 21 is vertical and intersects with the restraining structure 22. The restraining structure 22 slides up and down at the center of the bottom block 21 to cover and clamp the connecting block 23 and the outer edge of the pulley 24 at the lower end of the bottom block 21.

[0043] The restraining structure 22 is further provided with a pull block 221. The lower end of the pull block 221 is connected to a force-bearing block 222. The lower end of the force-bearing block 222 is connected to a vertical sleeve 223. The lower end of the vertical sleeve 223 is connected to a cylindrical sleeve 224.

[0044] The pull block 221 and the force block 222 are on the same vertical line. The vertical sleeve 223 and the cylindrical sleeve 224 at the lower end of the force block 222 are penetrated by the connecting block 23 and the pulley 24. The cylindrical sleeve 224 contacts and clamps the edge of the pulley 24.

[0045] The specific functions and operation procedures of this embodiment are as follows: In this invention, the bottom block 21 of the second wheel assembly 2 is vertically fixed to the corner of the parallel plate 3. The connecting block 23 and pulley 24 at the lower end are then set in a vertical orientation. After the pulley 24 contacts the ground, it can rotate under the push of the pusher 65, causing the entire device to shift. During single-point detection, the pulley 24's edge can be clamped and fixed by the downward push of the restraining structure 22, forcing the pulley 24 to stop rotating. Simultaneously, the device can autonomously perform single-point detection at the origin without manual support, improving the ease of use. Furthermore, the pulling block 221 of the restraining structure 22 can hold the force-bearing block 222... Pulling it upward forces the vertical sleeve 223 to reset inside the cylindrical sleeve 224 and enter the bottom block 21, releasing the pulley 24 so that it can rotate normally. Conversely, when performing single-point detection, the force block 222 is pushed downward, forcing the vertical sleeve 223 and the cylindrical sleeve 224 to slide down, so that they can cover the edge of the connecting block 23 and the pulley 24. At the same time, the rubber rebound effect is used to clamp and restrain them. During the process, the cylindrical sleeve 224 and the vertical sleeve 223 both have clamping grooves in their center, which allows the connecting block 23 and the pulley 24 to be covered and to slide vertically up and down at the center of the bottom block 21.

[0046] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. A field testing device for building inspection and assessment, comprising: The system comprises a first wheel assembly (1), a second wheel assembly (2), a parallel plate (3), a control screen (4), an ultrasonic main body (5), and an auxiliary structure (6). The first wheel assembly (1) and the second wheel assembly (2) are installed at the corners of the parallel plate (3), and the control screen (4) at the upper end of the parallel plate (3) controls the ultrasonic main body (5). The edge of the ultrasonic main body (5) is restrained by the auxiliary structure (6). The system is characterized by: The auxiliary structure (6) is provided with a first support body (62) and a second support body (63). The lower ends of the first support body (62) and the second support body (63) are provided with welding ends (61). The second support body (63) is externally connected to a clamping block (64) and is equipped with a pusher (65). The second support body (63) is internally provided with a restraining block (66). The first support body (62) is also provided with a solid block (621), which is integrated with the contact layer (622). The contact layer (622) is connected with a positioning block (623) and a support rod (624). A reinforcing structure (625) is provided in the spacing of the support rods (624). The probe is brought into contact with the wall by controlling the telescopic rod carried by the ultrasonic body (5) through the control panel (4). At the same time, the ultrasonic body (5) is forcibly fixed to the surface of the parallel plate (3) by the restraining block (66) of the second support body (63) of the auxiliary structure (6) and the reinforcing structure (625) of the first support body (62). Then, the first wheel group (1) and the second wheel group (2) are driven to move by the external pusher (65) of the second support body (63), which forces the probe of the ultrasonic body (5) to move stably on the wall for continuous measurement or single-point fixed measurement.

2. The on-site testing device for building inspection and appraisal according to claim 1, characterized in that: The first wheel set (1) and the second wheel set (2) are arranged in four directions at the corners of the parallel plate (3). The control screen (4) and the ultrasonic body (5) on the parallel plate (3) are set in a vertical direction. The auxiliary structure (6) is arranged in a symmetrical direction at the edge of the ultrasonic body (5). The ultrasonic body (5) contains a telescopic rod and an ultrasonic probe.

3. The on-site testing device for building inspection and appraisal according to claim 1, characterized in that: The first support (62) and the second support (63) are welded and fixed to the surface of the parallel plate (3) through the welding end (61). The clamping block (64) of the second support (63) is set in a symmetrical position and determines the position of the pusher (65). The restraining block (66) of the second support (63) is a raised solid shape that inserts and restrains one edge of the ultrasonic body (5).

4. The on-site testing device for building inspection and appraisal according to claim 1, characterized in that: The solid block (621) is "L" shaped and overlaps with the other end of the ultrasonic body (5) through the parallel contact layer (622). The positioning block (623) determines the position of the support rod (624) on the contact layer (622) and sets it in a vertical orientation. The support rod (624) is equipped with three sets of reinforcing structures (625) to clamp and reinforce one edge of the ultrasonic body (5).

5. The on-site testing device for building inspection and appraisal according to claim 1, characterized in that: The reinforcement structure (625) is provided with a protective plate (6251). One end of the protective plate (6251) is parallel to the surface of the inner block (6252), and slots (6253) are opened in the center of the upper and lower edges of the inner block (6252). A protrusion (6254) is provided in the center of the inner block (6252), and an outer block (6255) is connected to the other end of the protrusion (6254). A bolt (6256) is provided in the center of the outer block (6255), and the bolt (6256) passes through the protrusion (6254) and the inner block (6252) to control the protective plate (6251). The protective plate (6251) is parallel in shape. The inner block (6252) and the outer block (6255) are respectively set on the inner and outer sides of the contact layer (622). The protective plate (6251) clamps and fixes one end of the edge of the ultrasonic body (5) by rotating the bolt (6256). One end of the protrusion (6254) of the inner block (6252) is inserted into the center of the outer block (6255) to allow the bolt (6256) to rotate in the center.

6. The on-site testing device for building inspection and appraisal according to claim 5, characterized in that: The protective plate (6251) is also provided with a silicone plate (2511), one end of which is provided with a solid plate (2512), and the other side of the solid plate (2512) is connected to a center block (2513), and the center block (2513) is connected to a rotating sleeve (2514). The silicone plate (2511) and the solid plate (2512) are parallel to each other and integrated. The central block (2513) of the solid plate (2512) is convex and the rotating sleeve (2514) is embedded in the center of the built-in block (6252) and fixedly connected with the bolt (6256).

7. The on-site testing device for building inspection and appraisal according to claim 1, characterized in that: The second wheel set (2) is provided with a bottom block (21), and a restraining structure (22) is connected to the center of the bottom block (21). The position of the pulley (24) is determined by the connecting block (23) at the lower center of the bottom block (21). The restraining structure (22) passes through the center of the bottom block (21) and fits into the position of the connecting block (23) and the pulley (24). The bottom block (21) is vertical and intersects with the restraining structure (22). The restraining structure (22) slides up and down in the center of the bottom block (21) to cover and clamp the connecting block (23) and the outer edge of the pulley (24) at the lower end of the bottom block (21).

8. The on-site testing device for building inspection and appraisal according to claim 7, characterized in that: The restraining structure (22) is also provided with a pull block (221), the lower end of the pull block (221) is connected to a force block (222), the lower end of the force block (222) is connected to a vertical sleeve (223), and the lower end of the vertical sleeve (223) is connected to a cylindrical sleeve (224). The pull block (221) and the force block (222) are on the same vertical line. The vertical sleeve (223) and cylindrical sleeve (224) at the lower end of the force block (222) are penetrated by the connecting block (23) and the pulley (24). The cylindrical sleeve (224) contacts and clamps the edge of the pulley (24).

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