Clamping tool for detecting building reinforcing bars
By employing two sets of moving clamping modules and automated clamping technology in the rebar inspection clamping fixture, the problems of low centering accuracy, poor stability, and poor compatibility of traditional clamping fixtures are solved, achieving efficient and stable rebar inspection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 大连金普新区工程质量与安全监督中心
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-16
AI Technical Summary
Traditional rebar inspection clamping fixtures have low centering accuracy, poor stability, are time-consuming and labor-intensive to operate manually, and the clamping modules are severely worn, difficult to disassemble and replace, and have poor compatibility.
It employs two sets of moving clamping modules, combined with power and transmission components for automated clamping. Compression springs are set to accommodate steel bars of different diameters, and clamping is achieved by rotating a bidirectional screw driven by a motor, facilitating disassembly and replacement.
It improves clamping accuracy and stability, saves manpower, increases testing efficiency, adapts to steel bars of different diameters, and facilitates module replacement.
Smart Images
Figure CN224360046U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steel bar testing technology in construction, and specifically relates to clamping fixtures for steel bar testing in construction. Background Technology
[0002] Reinforcing bars are a type of steel profile that is often woven into a mesh structure and embedded in concrete to withstand tensile or compressive forces. They are an indispensable core material in construction engineering, and their performance and quality directly affect the safety, durability, and stability of building structures.
[0003] Currently, traditional clamping fixtures used for rebar inspection often have the following problems.
[0004] 1. Low centering accuracy and poor stability result in significant deviations between the measured rebar measurements and the actual situation, which is not conducive to high-precision testing.
[0005] 2. Manually clamping the reinforcing bars is time-consuming, labor-intensive, and inefficient.
[0006] 3. The clamping modules, which frequently come into contact with the reinforcing bars, are severely worn and difficult to disassemble and replace.
[0007] 4. The end clamping structure of the tooling is not easy to adjust and has poor compatibility with steel bars of different thicknesses. Utility Model Content
[0008] The problem this utility model aims to solve is that traditional clamping fixtures used for rebar inspection have low centering accuracy, poor stability, require manual operation, are time-consuming and labor-intensive, have low efficiency, and the clamping modules are not easy to disassemble and replace. Furthermore, they have poor compatibility with rebars of different thicknesses. This application uses two sets of moving clamping modules for clamping, which has high centering accuracy and good stability. A power component is set up in conjunction with a transmission component for automated clamping, saving manpower and increasing efficiency. Compression springs are set in the upper and lower clamping blocks to adapt to construction rebars of different diameters. Bolts are used to connect the moving blocks and the lower clamping blocks for easy disassembly and replacement.
[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: The clamping fixture for testing steel bars in construction includes a shell assembly, a power assembly, a transmission assembly, and a movable clamping assembly. The shell assembly is a hollow cuboid structure. The power assembly and the transmission assembly are both located inside the shell assembly. The power assembly is fixedly connected to the shell assembly. The end of the transmission assembly away from the power assembly is threadedly connected to the movable clamping assembly. The transmission assembly and the power assembly are belt driven to drive the bidirectional screw to rotate, thereby causing the movable clamping assembly to clamp or release. The movable clamping assembly includes an upper clamping block and a lower clamping block. The upper clamping block and the lower clamping block are located at the upper and middle parts of the movable clamping assembly and are used to clamp the steel bars. Multiple movable clamping assemblies are symmetrically arranged relative to the middle section of the shell along its length direction.
[0010] Furthermore, the outer casing assembly includes a shell, a support plate, positioning holes, and guide grooves. The shell is made of welded sheet metal and is horizontally placed on the ground. The support plate is located in the middle of the shell. Both ends of the support plate are fixedly connected to the two inner surfaces of the shell in the width direction. The guide grooves are located on both sides of the upper surface of the shell. The longitudinal central axis of the guide grooves is parallel to the width direction of the shell. Multiple positioning holes are located below the positioning grooves and are fixedly connected to the inner surface of the shell in the length direction. The multiple positioning holes are symmetrical with respect to the middle section of the shell in the length direction.
[0011] Furthermore, the power assembly includes a motor, an axial reducer, a first synchronous pulley, a first synchronous belt, and a first external retaining ring; the axial reducer is located above the support plate, the axial reducer is fixedly connected to the support plate, the axial reducer is keyed to the motor, the output shaft of the axial reducer is keyed to the first synchronous pulley, and the first synchronous pulley is provided with first external retaining rings on both sides to restrict the axial movement of the first synchronous pulley, and the first synchronous pulley meshes with the first synchronous belt for transmission.
[0012] Furthermore, the power assembly also includes a second synchronous pulley and a second synchronous belt. The output shaft of the axial reducer is keyed to the second synchronous pulley on the side away from the first synchronous pulley. Both sides of the second synchronous pulley are provided with first external retaining rings to restrict the axial movement of the second synchronous pulley. The second synchronous pulley meshes with the second synchronous belt to perform belt drive and drive the first synchronous belt to rotate.
[0013] Furthermore, the transmission assembly includes a deep groove ball bearing, a third synchronous pulley, a first double-acting screw, and a second external retaining ring. The deep groove ball bearing is concentrically arranged with the positioning hole and is flush with the end face of the positioning hole. The first double-acting screw is concentrically arranged with the deep groove ball bearing and abuts against the inner surface of the housing along its length. The third synchronous pulley meshes with the first synchronous belt and is keyed to the first double-acting screw. The third synchronous pulley is provided with second external retaining rings on both sides to restrict the axial movement of the third synchronous pulley on the first double-acting screw.
[0014] Furthermore, the transmission assembly also includes a fourth synchronous pulley and a second double-acting screw. The deep groove ball bearing is concentrically arranged with the positioning hole and is flush with the end face of the positioning hole. The keyway on the second double-acting screw is closer to the end face, so that the first synchronous belt and the second synchronous belt do not interfere with each other during belt drive. The second double-acting screw is concentrically arranged with the deep groove ball bearing and abuts against the inner surface of the housing along its length. The fourth synchronous pulley meshes with the second synchronous belt and is keyed to the second double-acting screw. The fourth synchronous pulley is provided with second external retaining rings on both sides to restrict the axial movement of the fourth synchronous pulley on the second double-acting screw.
[0015] Furthermore, the movable clamping assembly also includes a movable block, an internal threaded hole, and a bolt bottom hole. The movable block is located at the lower part of the movable clamping assembly and is mounted on the first bidirectional screw. The internal threaded hole located at the lower part of the movable block is threadedly connected to the first bidirectional screw. The two sides of the movable block abut against the guide groove, and the upper surface of the movable block is provided with a bolt bottom hole for bolt connection.
[0016] Furthermore, the movable clamping assembly also includes a mounting threaded hole, a lower clamping slot, a spring holder, a guide rod slot, and a spring holder limiting hole. The lower surface of the lower clamping block is provided with a mounting threaded hole for bolt connection with the movable block. The upper surface of the lower clamping block is provided with a guide rod slot and a lower clamping slot. The lower clamping slot abuts against the reinforcing bar when the tooling is clamped. One side surface of the lower clamping block is provided with a spring holder limiting hole for inserting the spring holder to limit the up and down movement of the spring.
[0017] Furthermore, the movable clamping assembly also includes a guide rod and a spring stop block. The upper clamping block has a guide rod at its lower part, and the end of the guide rod away from the upper clamping block is fixedly connected to the spring stop block. The guide rod of the upper clamping block is slidably connected to the guide rod groove of the lower clamping block.
[0018] Furthermore, the movable clamping assembly also includes a compression spring, which is located between the spring stop block and the spring holder to limit the upward sliding of the upper clamping block.
[0019] Compared with the prior art, the advantages and positive effects of this utility model are as follows.
[0020] The problem this utility model aims to solve is that traditional clamping fixtures used for rebar inspection have low centering accuracy, poor stability, require manual operation, are time-consuming and labor-intensive, have low efficiency, and the clamping modules are not easy to disassemble and replace. Furthermore, they have poor compatibility with rebars of different thicknesses. This application uses two sets of moving clamping modules for clamping, which has high centering accuracy and good stability. A power component is set up in conjunction with a transmission component for automated clamping, saving manpower and increasing efficiency. Compression springs are set in the upper and lower clamping blocks to adapt to construction rebars of different diameters. Bolts are used to connect the moving blocks and the lower clamping blocks for easy disassembly and replacement.
[0021] 1. This invention sets up multiple sets of movable clamping components that are symmetrical about the central cross section of the shell for clamping and positioning. The bidirectional screw drives the movable clamping module to move in the same direction to clamp the steel bars for construction, resulting in high clamping accuracy and good stability.
[0022] 2. The motor provides power, which is reduced in speed and increased in torque by an axial reducer. The power is then transmitted through a synchronous pulley and synchronous belt to drive a bidirectional screw to rotate in the same direction. This drives the moving clamping module to perform automated clamping steps, saving labor and increasing efficiency.
[0023] 3. The lower clamping block is provided with a threaded hole for installation, and the upper surface of the moving block is provided with a bolt bottom hole. The lower clamping block and the moving block can be bolted together for easy disassembly and replacement.
[0024] 4. A compression spring is provided between the upper clamping block and the lower clamping block. Due to the downward elastic force on the upper clamping block, when the upper clamping block comes into contact with a large-diameter steel bar, the upper clamping block can extend upward to clamp it, which can accommodate steel bars of different diameters. Attached Figure Description
[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0026] Figure 1 This is a schematic diagram of the overall structure of the clamping fixture for testing steel bars in construction, as implemented in this utility model.
[0027] Figure 2 This is a schematic diagram of the internal structure of a clamping fixture for inspecting steel bars in construction, as implemented in this utility model.
[0028] Figure 3 This is a schematic diagram of the internal side of a clamping fixture for inspecting steel bars in construction, as implemented in this utility model.
[0029] Figure 4 This is a schematic diagram of the structure of the movable clamping component in an embodiment of this utility model;
[0030] Figure 5 This is a schematic diagram of the cross-sectional direction of the movable clamping component in an embodiment of this utility model;
[0031] Figure 6 This is a CC cross-sectional view of the movable clamping assembly in an embodiment of this utility model;
[0032] Figure 7 This is a DD cross-sectional view of the movable clamping assembly in an embodiment of this utility model. Attached image description:
[0034] 1. Housing assembly; 101. Housing; 102. Support plate; 103. Positioning hole; 105. Guide groove; 2. Power assembly; 201. Motor; 202. Axial reducer; 203. First synchronous pulley; 205. Second synchronous pulley; 206. Second synchronous belt; 207. First synchronous belt; 208. First external snap ring; 3. Transmission assembly; 301. Deep groove ball bearing; 302. First double-acting screw; 303. Third synchronous pulley; 305. Second external snap ring; 306. 307. Double-acting screw; 5. Fourth synchronous pulley; 6. Moving clamping assembly; 7. Moving block; 8. Internal threaded hole; 9. Bolt bottom hole; 10. Lower clamping block; 11. Mounting threaded hole; 12. Guide rod groove; 13. Spring seat limiting hole; 14. Lower clamping slot; 15. Upper clamping block; 16. Upper clamping slot; 17. Guide rod; 18. Compression spring; 19. Spring seat; 20. Spring blocking block. Detailed Implementation
[0035] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0038] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0039] refer to Figure 1 and Figure 2 A clamping fixture for inspecting steel bars used in construction includes an outer shell assembly 1, a power assembly 2, a transmission assembly 3, and a movable clamping assembly 5. The outer shell assembly 1 is a hollow cuboid structure. The power assembly 2 and the transmission assembly 3 are both located inside the outer shell assembly 1. The power assembly 2 is fixedly connected to the outer shell assembly 1. The end of the transmission assembly 3 away from the power assembly 2 is threadedly connected to the movable clamping assembly 5. The transmission assembly 3 and the power assembly 2 are connected by a belt drive to drive the bidirectional screw to rotate, thereby causing the movable clamping assembly 5 to clamp or loosen.
[0040] The movable clamping assembly 5 includes an upper clamping block and a lower clamping block 502. The upper clamping block and the lower clamping block 502 are located at the upper and middle parts of the movable clamping assembly 5, respectively, and are used to clamp the reinforcing bars. Multiple movable clamping assemblies 5 are symmetrically arranged relative to the middle section of the shell 101 in the length direction, which ensures stable clamping and good centering accuracy of the reinforcing bars.
[0041] refer to Figure 1 and Figure 2 The outer casing assembly 1 includes a housing 101, a support plate 102, positioning holes 103, and a guide groove 105. The housing 101 is made of welded sheet metal and is horizontally placed on the ground. The support plate 102 is located in the middle of the housing 101. Both ends of the support plate 102 are fixedly connected to the two inner surfaces of the housing 101 in the width direction. The guide groove 105 is located on both sides of the upper surface of the housing 101. The direction of the guide groove 105 is the same as the width direction of the housing 101, so that the movable clamping assembly 5 can move in the guide groove 105 and play a guiding role. Multiple positioning holes 103 are located below the positioning groove. The positioning holes 103 are fixedly connected to the inner surface of the housing 101 in the length direction. The positioning holes 103 are symmetrical with respect to the middle section of the housing 101 in the length direction. The positioning holes 103 can be used to install the deep groove ball bearing 301.
[0042] refer to Figure 2 and Figure 3The power assembly 2 includes a motor 201, an axial reducer 202, a first synchronous pulley 203, a first synchronous belt 207, and a first external retaining spring 208. The axial reducer 202 is located above the support plate 102 and is fixedly connected to the support plate 102. The axial reducer 202 is keyed to the motor 201. The output shaft of the axial reducer 202 is provided with a keyway and is keyed to the first synchronous pulley 203. The axial reducer 202 plays a role in reducing speed and increasing torque, thereby increasing the clamping force on the steel bars for construction. The first synchronous pulley 203 is provided with first external retaining springs 208 on both sides to restrict the axial movement of the first synchronous pulley 203. The first synchronous pulley 203 meshes with the first synchronous belt 207 to provide power input to the transmission assembly 3.
[0043] refer to Figure 2 The power assembly 2 also includes a second synchronous pulley 205 and a second synchronous belt 206. The output shaft of the axial reducer 202 is keyed to the second synchronous pulley 205 on the side away from the first synchronous pulley 203. The second synchronous pulley 205 is provided with a first external snap ring 208 on both sides to restrict the axial movement of the second synchronous pulley 205. The second synchronous pulley 205 meshes with the second synchronous belt 206 to perform belt drive.
[0044] refer to Figure 2 The transmission assembly 3 includes a deep groove ball bearing 301, a third synchronous pulley 303, a first bidirectional screw 302, and a second external retaining ring 305. The deep groove ball bearing 301 is concentrically arranged with the positioning hole 103, and the end face of the deep groove ball bearing 301 is flush with the positioning hole 103. The first bidirectional screw 302 is symmetrically provided with threads of opposite directions and has a keyway. The first bidirectional screw 302 is concentrically arranged with the deep groove ball bearing 301 and abuts against the inner surface of the housing 101 in the length direction. The third synchronous pulley 303 meshes with the first synchronous belt 207 for transmission. The third synchronous pulley 303 is keyed to the first bidirectional screw 302. The third synchronous pulley 303 is provided on both sides of the third synchronous pulley 303 to restrict the axial movement of the third synchronous pulley 303 on the first bidirectional screw 302.
[0045] refer to Figure 2The transmission assembly 3 also includes a fourth synchronous pulley 307 and a second bidirectional screw 306. The deep groove ball bearing 301 is concentrically arranged with the positioning hole 103, and the end face of the deep groove ball bearing 301 is flush with the end face of the positioning hole 103. The second bidirectional screw 306 is symmetrically provided with threads of opposite directions and has a keyway. The keyway on the second bidirectional screw 306 is located closer to the end face, so that the first synchronous belt 207 and the second synchronous belt 206 do not interfere with each other during belt drive. The second bidirectional screw 306 is concentrically arranged with the deep groove ball bearing 301 and abuts against the inner surface of the housing 101 in the length direction. The fourth synchronous pulley 307 meshes with the second synchronous belt 206 and is keyed to the second bidirectional screw 306. The fourth synchronous pulley 307 is provided with second external retaining rings 305 on both sides of the fourth synchronous pulley 307 to restrict the axial movement of the fourth synchronous pulley 307 on the second bidirectional screw 306.
[0046] refer to Figures 4-6 The movable clamping assembly 5 also includes a movable block 501, an internal threaded hole 501-A, and a bolt bottom hole 501-B. The movable block 501 is located at the lower part of the movable clamping assembly 5 and is mounted on the first bidirectional screw 302. The internal threaded hole 501-A located at the lower part of the movable block 501 is threadedly connected to the first bidirectional screw 302. The two sides of the movable block 501 abut against the guide groove 105 to play a guiding role. The upper surface of the movable block 501 is provided with a bolt bottom hole 501-B for bolting connection with the lower clamping block 502. Since the clamping block is in long-term contact with the steel bars used in construction, it is severely worn. This structure can be easily disassembled and replaced.
[0047] refer to Figures 4-6 The movable clamping assembly 5 also includes a mounting threaded hole 502-A, a lower clamping slot, a spring holder, a guide rod slot 502-B, and a spring holder limiting hole 502-C. The lower clamping block 502 has a mounting threaded hole 502-A on its lower surface for bolt connection with the movable block 501 for easy disassembly. The upper surface of the lower clamping block 502 has a guide rod slot 502-B and a lower clamping slot. The lower clamping slot abuts against the reinforcing bar when the tooling is clamped. One side surface of the lower clamping block 502 has a spring holder limiting hole 502-C for inserting the spring holder to limit the up and down movement of the spring.
[0048] refer to Figure 6 and Figure 7 The movable clamping assembly 5 also includes a guide rod and a spring stop block. The upper clamping block has a guide rod at its lower part. The guide rod is fixedly connected to the spring stop block at the end away from the upper clamping block. The guide rod of the upper clamping block is slidably connected to the guide rod groove 502-B of the lower clamping block 502, so as to realize the up and down sliding of the upper clamping block. This makes the movement between the upper clamping block and the lower clamping block 502 precise, less prone to deflection, and less prone to errors during the clamping and inspection of steel bars for construction.
[0049] refer to Figure 7 The movable clamping assembly 5 also includes a compression spring, which is located between the spring blocking block and the spring holder to restrict the upper clamping block from sliding upward. When installing the upper clamping block and the lower clamping block 502, the compression spring needs to be placed on the spring blocking block and inserted into the guide rod groove 502-B of the lower clamping block 502 together with the upper clamping block. Then, the spring holder is inserted to the bottom through the spring holder limiting hole 502-C to restrict the movement of the spring, so that the upper clamping block is subjected to a downward elastic force during the clamping process. The steel bar abuts against the upper clamping groove and the lower clamping groove. This structure can change the distance between the upper clamping block and the lower clamping block 502. Because the upper clamping block is subjected to a downward elastic force, it can adapt to steel bars of different diameters for construction.
[0050] The working process of the clamping fixture for testing reinforcing steel bars in this embodiment is as follows: First, the clamping fixture for testing reinforcing steel bars is placed horizontally on the ground. The motor 201 is started, and after the speed is reduced and the torque is increased by the axial reducer 202, the belt drive drives the transmission component 3, so that the first bidirectional screw 302 and the second bidirectional screw 306 rotate in the same direction, so that the moving clamping component 5 moves closer in the same direction. Due to the elastic force generated by the compression spring between the upper clamping block and the lower clamping block 502, there is a clamping force between the upper clamping block and the lower clamping block 502. The operator takes a reinforcing steel bar to be tested and abuts it against the lower clamping slot of the moving clamping component 5 on one side. After the moving clamping components 5 on both sides have completely clamped the reinforcing steel bar, they are released, and subsequent testing can begin.
[0051] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.
Claims
1. A clamping fixture for inspecting reinforcing steel bars in construction, characterized in that: It includes a housing assembly, a power assembly, a transmission assembly, and a movable clamping assembly. The housing assembly is a hollow cuboid structure. The power assembly and the transmission assembly are both located inside the housing assembly. The power assembly is fixedly connected to the housing assembly. The end of the transmission assembly away from the power assembly is threadedly connected to the movable clamping assembly. The transmission assembly and the power assembly are connected by a belt drive to drive the bidirectional screw to rotate, thereby causing the movable clamping assembly to clamp or loosen. The movable clamping assembly includes an upper clamping block and a lower clamping block, which are located at the top and middle of the movable clamping assembly and are used to clamp the reinforcing bars. Multiple movable clamping assemblies are symmetrically arranged relative to the middle section of the shell along its length.
2. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 1, characterized in that: The outer casing assembly includes a shell, a support plate, positioning holes, and guide grooves. The shell is made of welded sheet metal and is horizontally placed on the ground. The support plate is located in the middle of the shell. Both ends of the support plate are fixedly connected to the two inner surfaces of the shell in the width direction. The guide grooves are located on both sides of the upper surface of the shell. The longitudinal central axis of the guide grooves is parallel to the width direction of the shell. Multiple positioning holes are located below the positioning grooves and are fixedly connected to the inner surface of the shell in the length direction. The multiple positioning holes are symmetrical with respect to the middle section of the shell in the length direction.
3. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 2, characterized in that: The power assembly includes a motor, an axial reducer, a first synchronous pulley, a first synchronous belt, and a first external retaining ring. The axial reducer is located above the support plate and is fixedly connected to the support plate. The axial reducer is keyed to the motor, and the output shaft of the axial reducer is keyed to the first synchronous pulley. The first synchronous pulley is provided with first external retaining rings on both sides to restrict the axial movement of the first synchronous pulley. The first synchronous pulley meshes with the first synchronous belt for transmission.
4. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 3, characterized in that: The power assembly also includes a second synchronous pulley and a second synchronous belt. The output shaft of the axial reducer is keyed to the second synchronous pulley on the side away from the first synchronous pulley. The second synchronous pulley is provided with a first external snap ring on both sides to restrict the axial movement of the second synchronous pulley. The second synchronous pulley meshes with the second synchronous belt to perform belt drive and drive the first synchronous belt to rotate.
5. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 1, characterized in that: The transmission assembly includes a deep groove ball bearing, a third synchronous pulley, a first double-acting screw, and a second external retaining ring. The deep groove ball bearing is concentric with the positioning hole and flush with its end face. The first double-acting screw is concentric with the deep groove ball bearing and abuts against the inner surface of the housing along its length. The third synchronous pulley meshes with the first synchronous belt and is keyed to the first double-acting screw. Second external retaining rings are provided on both sides of the third synchronous pulley to restrict its axial movement on the first double-acting screw.
6. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 4, characterized in that: The transmission assembly also includes a fourth synchronous pulley and a second double-direction screw. The deep groove ball bearing is concentrically set with the positioning hole and is flush with the end face of the positioning hole. The keyway on the second double-direction screw is closer to the end face, so that the first synchronous belt and the second synchronous belt do not interfere with each other during belt drive. The second double-direction screw is concentrically set with the deep groove ball bearing and abuts against the inner surface of the housing along its length. The fourth synchronous pulley meshes with the second synchronous belt and is keyed to the second double-direction screw. The fourth synchronous pulley is provided with second external retaining rings on both sides to restrict the axial movement of the fourth synchronous pulley on the second double-direction screw.
7. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 1, characterized in that: The movable clamping assembly also includes a movable block, an internal threaded hole, and a bolt bottom hole. The movable block is located at the lower part of the movable clamping assembly and is mounted on the first bidirectional screw. The internal threaded hole located at the lower part of the movable block is threadedly connected to the first bidirectional screw. The two sides of the movable block abut against the guide groove. The upper surface of the movable block is provided with a bolt bottom hole for bolt connection.
8. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 1, characterized in that: The movable clamping assembly also includes a mounting threaded hole, a lower clamping slot, a spring holder, a guide rod slot, and a spring holder limiting hole. The lower surface of the lower clamping block is provided with a mounting threaded hole for bolt connection with the movable block. The upper surface of the lower clamping block is provided with a guide rod slot and a lower clamping slot. The lower clamping slot abuts against the reinforcing bar when the tooling is clamped. One side surface of the lower clamping block is provided with a spring holder limiting hole for inserting the spring holder to limit the up and down movement of the spring.
9. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 1, characterized in that: The movable clamping assembly also includes a guide rod and a spring stop block. The guide rod is provided at the lower part of the upper clamping block. The end of the guide rod away from the upper clamping block is fixedly connected to the spring stop block. The guide rod of the upper clamping block is slidably connected to the guide rod groove of the lower clamping block.
10. The clamping fixture for inspecting reinforcing steel bars in construction according to claim 1, characterized in that: The movable clamping assembly also includes a compression spring, which is located between the spring stop block and the spring holder to limit the upward sliding of the upper clamping block.