A tension detection device for a steel strand

Abstract

The utility model relates to tension detection technical field of steel strand, concretely relates to a tension detection device of steel strand, including the fixed plate of assembly distance sensor, the one side of fixed plate is provided with fixed cylinder, fixed plate is connected with fixed cylinder, first spring and round plate are sequentially arranged in fixed cylinder along the direction of far from fixed plate, the both sides of first spring are contacted with round plate and fixed plate respectively, the one end of fixed cylinder far from fixed plate is provided with limit ring, this limit ring is installed in the inner chamber of fixed cylinder, the one side of round plate far from first spring is provided with insertion cylinder, the inner chamber diameter of insertion cylinder is not greater than the inner chamber diameter of this limit ring and is in accord with, the fixed ring is suitably installed on insertion cylinder close to fixed cylinder, insertion cylinder is connected with fixed cylinder through fixed ring, the sidewall of insertion cylinder is provided with threaded hole, the first bolt is screw -threaded suitably installed in this threaded hole. The utility model provides a tension detection device of steel strand that is convenient to assemble and is convenient to detect the elongation length of steel strand.

Description

Technical Field

[0001] This utility model relates to the field of tension testing technology for steel strands, and specifically to a tension testing device for steel strands. Background Technology

[0002] Prestressed tensioning is a process of tensioning steel strands mounted on building components. Its core purpose is to pre-stress the building components to optimize and improve their load-bearing performance, thus counteracting the tensile stress generated by loads during service life. This improves the crack resistance, stiffness, and durability of the building components while reducing cross-sectional dimensions and material usage. Prestressing jacks and hydraulic pumps are commonly used tensioning tools. The prestressing jacks are first mounted at the points where the steel strands exit the building component, allowing the strands to pass through the jacks' ends. Pressure is applied to the jacks by controlling the hydraulic pump, and the prestressing jacks then tension the steel strands outward, effectively applying stress to the building component. As a key load-bearing component in building structures, the control of the tension force of the prestressed steel strands directly affects the quality of prestressing. To ensure that the tension force of the prestressed steel strands meets design requirements, commonly used control methods include stress control and elongation methods. The stress control method uses the calibration curve of the pressure gauge on the oil pump to pre-calculate the pressure gauge readings corresponding to each tension level, allowing for analysis of the tensile stress on the prestressed steel strand based on these readings. The elongation method calculates the elongation of the steel strand at each tension level based on the elongation of the prestressed steel strand pulled by the prestressing jack, thus analyzing the tensile stress on the prestressed steel strand by measuring the elongation. Using these two methods allows for mutual verification, effectively improving the accuracy of tension control, ensuring the quality and effectiveness of prestressed tensioning projects, and providing a solid guarantee for the safety and durability of building components.

[0003] The elongation measurement technique encompasses both mechanical and electronic methods. Mechanical methods rely primarily on traditional measuring tools such as vernier calipers and steel rulers, directly measuring the elongation of the steel strand under stress. Electronic methods are more modern, using distance sensors to measure the change in distance between the steel strand passing through the prestressed steel strand and the sensor, thus detecting the elongation. However, directly using vernier calipers or steel rulers to measure the steel strand during the application of pressure by the prestressing jack is not only cumbersome but also poses significant safety hazards. Therefore, distance sensors have gradually become a commonly used measuring tool in the elongation measurement method. Distance sensors are used to measure the distance between the target object and the sensor. To facilitate the detection of changes in the steel strand's elongation, a bracket needs to be installed on the outside of the prestressing jack to mount the sensor. While this method meets the requirements for using distance sensors, fixing the bracket to the foundation and adjusting the sensor's detection end to align with the steel strand requires considerable time and effort. Therefore, there are shortcomings in the tension testing of steel strands. By improving the assembly scheme of the distance sensor, it is easier to detect the elongation of the steel strand and to facilitate assembly, thus providing a more efficient and reliable guarantee for the tension testing of steel strands. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a tensioning detection device for steel strands that is easy to assemble and facilitates the detection of the elongation length of steel strands, thereby overcoming the deficiencies in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a tension detection device for steel strand, including a fixed plate equipped with a distance sensor, a fixed cylinder provided on one side of the fixed plate, the fixed plate being connected to one end of the fixed cylinder, a first spring and a circular plate being arranged sequentially inside the fixed cylinder along the direction away from the fixed plate, the detection end of the distance sensor facing the circular plate, the two sides of the first spring contacting the circular plate and the fixed plate respectively, the diameter of the circular plate matching the inner diameter of the fixed cylinder, a limiting ring provided at the end of the fixed cylinder away from the fixed plate, the limiting ring being installed in the inner cavity of the fixed cylinder, the circular plate contacting the limiting ring, an insertion cylinder provided on the side of the circular plate away from the first spring, the inner diameter of the insertion cylinder not greater than the inner diameter of the limiting ring matching, a fixing ring being fitted onto the insertion cylinder near the fixed cylinder, the insertion cylinder being connected to the fixed cylinder through the fixing ring, a threaded hole being opened on the side wall of the insertion cylinder, a first bolt being threaded into the threaded hole.

[0006] Preferably, a support cylinder is movably fitted onto the fixed cylinder. The support cylinder has two support grooves, each extending from one end to the other. The two support grooves are located on opposite sides of the support cylinder. A fixing rod is movably fitted into each of the two support grooves. One end of the fixing rod is mounted on the side wall of the fixed cylinder, and the other end extends out of the support groove. A nut is threaded onto the fixing rod, with one side of the nut contacting the outer wall of the support cylinder. The fixing rod is clamped onto the support cylinder by the nut. The fixing ring is connected to the fixed cylinder through the support cylinder.

[0007] Preferably, the support cylinder has a first cap with an open top threaded onto the side away from the distance sensor. A fixing ring is fitted inside the first cap, and the two sides of the fixing ring contact the bottom plate of the first cap and the end of the support cylinder, respectively. A through hole is provided on the bottom plate of the first cap, which is fitted onto the insertion cylinder. The diameter of the through hole matches the outer wall diameter of the insertion cylinder, and the outer wall diameter of the insertion cylinder is not greater than the outer wall diameter of the fixing ring. An arc-shaped handle is provided on the outer side of the support cylinder, and the bottom end of the handle is installed on the outer wall of the support cylinder.

[0008] Preferably, a marking layer is provided on one side of the support groove. The marking layer is installed on the outer wall of the support cylinder and extends along one end of the support cylinder to the other end. A second spring is provided on the side of the fixing rod near the distance sensor. The second spring is located inside the support cylinder and is fitted onto the fixing cylinder. A support ring is provided on the side of the second spring away from the fixing rod. The support ring is installed on the inner wall of the support cylinder. The inner diameter of the support ring matches the outer diameter of the fixing cylinder. The support ring is movably fitted onto the fixing cylinder. The two ends of the second spring are in contact with the support ring and the fixing rod, respectively.

[0009] Preferably, the fixed cylinder is threaded with a second cylinder cover with a top opening on the side away from the circular plate. The fixed plate adopts a circular plate structure and is fitted inside the second cylinder cover. The diameter of the fixed plate matches the inner diameter of the second cylinder cover. The two sides of the fixed plate are in contact with the end of the fixed cylinder and the bottom plate of the second cylinder cover, respectively.

[0010] Preferably, a sleeve is provided in the middle of the fixing plate, one end of the sleeve is installed on the fixing plate, the distance sensor is fitted inside the sleeve, a sleeve hole is provided on the side wall of the sleeve, and a second bolt is threaded into the sleeve hole, and the distance sensor is pressed and fixed inside the sleeve by the second bolt.

[0011] Preferably, a fixing tube is threaded onto the first bolt, one end of which is installed on the outer wall of the insertion cylinder, and the inner cavity of the fixing tube is connected to a threaded hole on the insertion cylinder.

[0012] The advantages of this invention are as follows: First, the distance sensor is mounted on one end of the fixed cylinder via a fixed plate, and the other end of the fixed cylinder is fitted onto the prestressed jack via an insertion sleeve. Then, by tightening the first bolt mounted on the insertion sleeve, the insertion sleeve and the fixed cylinder are fixedly mounted on the prestressed jack. This allows the distance sensor to be quickly and conveniently assembled onto the outside of the prestressed jack, thus rapidly completing the assembly process and reducing the burden and complexity of the distance sensor assembly. Furthermore, this invention utilizes the elasticity of the first spring to press the circular plate against the limiting ring on the fixed cylinder. The steel strand extending from the prestressed jack is used to press the circular plate, and the distance sensor detects the change in distance between the circular plate and the distance sensor to detect the elongation of the steel strand. Therefore, it is not necessary to align the detection end of the distance sensor with the steel strand, further reducing the tediousness and labor intensity of the detection work. In addition, since the steel strand extending from the prestressed jack is located inside the fixed cylinder and the insertion sleeve, the portion of the steel strand extending out of the prestressed jack is not exposed to the external environment, thus protecting the end of the steel strand.

[0013] Secondly, this invention utilizes a support cylinder with a support groove and a fixing rod on the fixing cylinder, allowing the fixing cylinder to move along the extension direction of the support groove. A nut threaded onto the fixing rod clamps the support cylinder onto the fixing cylinder, facilitating adjustment of the distance between the fixing cylinder and the fixing ring, especially when the initial wire threading is relatively long. Furthermore, the invention features a first cylinder cover for detachably mounting the fixing plate and insertion cylinder onto the support cylinder, allowing for replacement of the fixing ring and insertion cylinder. A second cylinder cover allows for detachably mounting the fixing plate onto the fixing cylinder, facilitating replacement of the fixing plate. A handle provides convenient access for use.

[0014] Furthermore, this invention utilizes a marking layer to allow for the movement length of the material fixing rod. A second spring and a support ring further compress and fix the fixing rod to the side of the support groove away from the distance sensor. This ensures that when the elongation of the steel strand during tensioning exceeds the range of the distance sensor (i.e., when the elongation exceeds the maximum distance between the distance sensor and the circular plate), the nut is loosened to allow the steel strand to push the fixing rod. The movement length of the fixing rod is recorded based on the marking layer, and combined with the distance sensor's detection information, the elongation of the steel strand is calculated to meet the requirements of long-range detection. Moreover, this invention uses a sleeve and a second bolt for easy installation and removal of the distance sensor, and a fixing tube to reinforce the connection between the first bolt and the insertion cylinder, improving the stability of the connection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a sectional perspective view of the present invention.

[0017] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0018] Figure 4 for Figure 2 Enlarged diagram of point B in the middle.

[0019] Figure 5 This is a schematic diagram of the assembly of the first cylinder cover and the support cylinder in this utility model.

[0020] Figure 6 This is an exploded view of the assembly of the disc, first spring, fixing plate, distance sensor, and second cylinder cover in this utility model. Detailed Implementation

[0021] like Figures 1 to 6As shown, a tension detection device for steel strand includes a fixed plate 2 equipped with a distance sensor 1. A fixed cylinder 3 is provided on one side of the fixed plate 2, and one end of the fixed plate 2 is connected to the fixed cylinder 3. Inside the fixed cylinder 3, a first spring 4 and a circular plate 5 are arranged sequentially along the direction away from the fixed plate 2. The detection end of the distance sensor 1 faces the circular plate 5, and the distance sensor 1 is located inside the first spring 4. The two sides of the first spring 4 are in contact with the circular plate 5 and the fixed plate 2, respectively. The diameter of the circular plate 5 is equal to the inner diameter of the fixed cylinder 3. The diameters of the cavities match. A limiting ring is provided at the end of the fixed cylinder 3 away from the fixed plate 2. This limiting ring is installed in the inner cavity of the fixed cylinder 3. The circular plate 5 contacts the limiting ring, thereby pressing the circular plate 5 onto the limiting ring by the elastic force of the first spring 4, preventing the circular plate 5 from sliding out of the fixed cylinder 3. An insertion cylinder 6 is provided on the side of the circular plate 5 away from the first spring 4. The inner diameter of the insertion cylinder 6 is not greater than the inner diameter of the limiting ring, so as to guide the steel strand into the fixed cylinder 3. The insertion cylinder 6 is close to the upper part of the fixed cylinder 3. The device is equipped with a fixing ring 7, and the insertion cylinder 6 is connected to the fixing cylinder 3 through the fixing ring 7. The side wall of the insertion cylinder 6 has a threaded hole, and a first bolt 8 is threaded into the threaded hole. By fitting the insertion cylinder 6 onto the output end of the prestressing jack, the circular plate 5 is compressed by the steel strand passing through the prestressing jack. Then, by turning the first bolt 8, the insertion cylinder 6 is quickly clamped onto the prestressing jack, thus assembling the device onto the prestressing jack. As the prestressing jack applies tension to the steel strand, the length of the steel strand passing through the prestressing jack gradually increases, pushing the circular plate 5 towards the fixing plate 2, thereby changing the distance between the distance sensor 1 and the circular plate 5. The distance sensor 1 senses the change in distance to obtain the elongation of the steel strand, and then calculates the tension force to determine whether the tension force meets the design requirements. The distance sensor 1 is an infrared sensor, laser sensor, or other sensor used to check the distance between the circular plate 5 and the fixing plate 2.

[0022] In this embodiment, a support cylinder 9 is movably fitted onto the fixed cylinder 3. Two support grooves 10 are formed on the support cylinder 9, extending from one end to the other. The two support grooves 10 are located on opposite sides of the support cylinder 9. A fixing rod 11 is movably fitted into each of the two support grooves 10. The diameter of the fixing rod 11 matches the width of the support groove 10. One end of the fixing rod 11 is mounted on the side wall of the fixed cylinder 3, and the other end protrudes from the support groove 10. A nut 12 is threaded onto the fixing rod 11, with one side of the nut 12 contacting the outer wall of the support cylinder 9. The fixing rod 11 is clamped onto the support cylinder 9 by the nut 12. The fixing ring 7 is connected to the fixed cylinder 3 via the support cylinder 9, facilitating adjustment of the distance between the fixed cylinder 3 and the fixing ring 7, to accommodate situations where the initial length of the steel strand is relatively long.

[0023] Specifically, the support cylinder 9 has a first cylinder cover 13 with an open top threaded onto the side away from the distance sensor 1. A fixing ring 7 is fitted inside the first cylinder cover 13. The two sides of the fixing ring 7 contact the bottom plate of the first cylinder cover 13 and the end of the support cylinder 9, respectively. A through hole is provided on the bottom plate of the first cylinder cover 13. The through hole is fitted onto the insertion cylinder 6. The diameter of the through hole matches the outer wall diameter of the insertion cylinder 6. The outer wall diameter of the insertion cylinder 6 is not greater than the outer wall diameter of the fixing ring 7. Thus, the fixing ring 7 and the insertion cylinder 6 can be detachably assembled onto the support cylinder 9 using the first cylinder cover 13. An arc-shaped handle 14 is provided on the outer side of the support cylinder 9. The bottom end of the handle 14 is installed on the outer wall of the support cylinder 9. By holding the handle 14, the present invention can be picked up and used.

[0024] Please refer to it again. Figure 1 and 2 A marking layer 15 is provided on one side of the support groove 10. The marking layer 15 is installed on the outer wall of the support cylinder 9 and extends along one end of the support cylinder 9 to the other end. The moving length of the fixing rod 11 is determined by observing the relative position of the fixing rod 11 and the marking layer 15. A second spring 16 is provided on the side of the fixing rod 11 near the distance sensor 1. The second spring 16 is located inside the support cylinder 9 and is fitted onto the fixing cylinder 3. The outer side of the second spring 16 contacts the inner wall of the support cylinder 9, and the inner side of the second spring 16 contacts the inner wall of the fixing cylinder 3. A support ring 17 is provided on the side of the second spring 16 away from the fixing rod 11 and is installed on the inner wall of the support cylinder 9. The inner diameter of ring 17 matches the outer diameter of fixed cylinder 3. Support ring 17 is movably fitted onto fixed cylinder 3. The two ends of second spring 16 contact support ring 17 and fixed rod 11 respectively. With the help of the elasticity of second spring 16, fixed rod 11 is pressed and fixed to the side of support groove 10 away from distance sensor 1. When the elongation of steel strand during tensioning is greater than the range of distance sensor 1, that is, when the elongation of steel strand during tensioning is greater than the maximum distance between distance sensor 1 and circular plate, nut 12 is loosened so that steel strand can be used to push fixed rod 11 to move. The moving length of fixed rod 11 is recorded according to label layer 15. Combined with the detection information of distance sensor 1, the elongation of steel strand is calculated to meet the needs of long range detection.

[0025] In this embodiment, the fixed cylinder 3 is threaded with a second cylinder cover 18 with a top opening on the side away from the circular plate 5. The fixed plate 2 adopts a circular plate structure and is fitted inside the second cylinder cover 18. The diameter of the fixed plate 2 matches the inner diameter of the second cylinder cover 18, and the diameter of the fixed plate 2 is not less than the inner diameter of the fixed cylinder 3. The two sides of the fixed plate 2 are in contact with the end of the fixed cylinder 3 and the bottom plate of the second cylinder cover 18, respectively, so that the fixed plate 2 can be detachably assembled onto the fixed cylinder 3 using the second cylinder cover 18.

[0026] Please refer to it again. Figure 2 and 6 A sleeve 19 is provided in the middle of the fixing plate 2. One end of the sleeve 19 is installed on the fixing plate 2. The distance sensor 1 is fitted inside the sleeve 19. A sleeve hole is provided on the side wall of the sleeve 19. A second bolt 20 is threaded into the sleeve hole. The distance sensor 1 is pressed and fixed inside the sleeve 19 by the second bolt 20 so that the distance sensor 1 can be installed and removed.

[0027] Specifically, a fixing tube 21 is threaded onto the first bolt 8. One end of the fixing tube 21 is installed on the outer wall of the insertion cylinder 6. The inner cavity of the fixing tube 21 is connected to a threaded hole on the insertion cylinder 6, thereby reinforcing the connection between the first bolt 8 and the insertion cylinder 6 and improving the stability of the connection between the first bolt 8 and the insertion cylinder 6.

[0028] The instructions for using this product are as follows: Figures 1 to 6 As shown, firstly, select anchorages, prestressing jacks, and oil pumps suitable for the steel strands, ensuring that the rated tension force of the prestressing jacks is 1.5 times the required tension force, and that the rated oil pressure of the oil pump meets the tensioning requirements of the prestressing jacks and is not less than 1.4 times the rated oil pressure. Install the selected anchorages and prestressing jacks sequentially on the steel strands, and connect the oil pump to the prestressing jacks. Next, install the distance sensor 1 inside the sleeve 19, and assemble the distance sensor 1 onto the fixing plate 2 by tightening the second bolt 20. Tighten the second cylinder cover 18, which is fitted with the fixing plate 2, onto the fixing cylinder 3, and tighten the first cylinder cover 13, which is fitted with the insertion cylinder 6, onto the support cylinder 9. Tighten the nut 12 onto the fixing rod 11, so that the support cylinder 9 is clamped onto the fixing cylinder 3. Then, the insertion cylinder 6 is fitted onto the output end of the prestressed jack, causing the steel strand protruding from the prestressed jack to push the circular plate 5 towards the distance sensor 1. By tightening the first bolt 8, the product is quickly clamped onto the prestressed jack, and the initial distance between the circular plate 5 and the distance sensor 1 is recorded. Next, by controlling the oil pressure of the oil pump, the prestressed jack is driven to pull the steel strand for tensioning. The tension force on the steel strand is calculated by the oil gauge of the oil pump and the distance sensor 1, respectively, in order to control the tensioning of the steel strand.

[0029] It should be noted that, to ensure the reliability of the tension force calculated by the oil pump's oil gauge and distance sensor 1, after installing this product onto the prestressing jack, control the oil pump to drive the prestressing jack for appropriate tensioning. Calculate the tension force based on the data fed back from the oil pump's oil gauge and distance sensor 1. If the deviation between the calculated tension force and the calculated tension force is controlled within ±2%, it proves that it meets the requirements. Conversely, if the deviation between the calculated tension force and the calculated tension force exceeds ±2%, the tensioning operation should be temporarily suspended. The elongation of the steel strand should be re-measured using mechanical measuring tools such as a steel ruler to identify the cause. After taking measures to adjust and ensure it meets the requirements, the tensioning operation can continue.

[0030] Furthermore, if the maximum distance between the distance sensor 1 and the circular plate 5 is less than the designed elongation of the steel strand, after assembling this product, by loosening the nut 12, the fixing rod 11 is pressed and fixed to the side of the support groove 10 away from the distance sensor 1 by the elasticity of the second spring 16. When installing this product on the prestressing jack, the insertion cylinder 6 is fitted onto the output end of the prestressing jack, so that the steel strand passing through the prestressing jack can push the circular plate 5 and the fixing cylinder 3 to move away from the prestressing jack respectively. The fixing cylinder 3 drives the fixing rod 11 to move in the support groove 10. The initial position of the fixing rod 11 is recorded according to the label layer 15, and the initial distance between the circular plate 5 and the distance sensor 1 is recorded by the distance sensor 1. During the tensioning process, by controlling the oil pressure of the oil pump, the prestressing jack is driven to pull the steel strand for tensioning. The movement length of the fixing rod 11 is read according to the label layer 15, and combined with the detection information of the distance sensor 1, the elongation of the steel strand can be calculated, thereby calculating the tension force on the steel strand to meet the needs of the tensioning operation.

[0031] In this embodiment, the distance sensor 1 is mounted on one end of the fixed cylinder 3 via the fixed plate 2, and the other end of the fixed cylinder 3 is fitted onto the prestressed jack via the insertion cylinder 6. The insertion cylinder 6 and the fixed cylinder 3 are then fixedly mounted on the prestressed jack by tightening the first bolt 8 mounted on the insertion cylinder 6. This allows the distance sensor 1 to be quickly and conveniently mounted on the outside of the prestressed jack, thus rapidly completing the assembly operation and reducing the burden and complexity of the distance sensor 11 during assembly. Furthermore, this invention utilizes the elasticity of the first spring 4 to press the circular plate 5 against the limiting ring set on the fixed cylinder 3. The circular plate 5 is then pressed by the steel strand passing through the prestressed jack, and the distance sensor 1 detects the change in distance between the circular plate 5 and the distance sensor 1 to detect the elongation of the steel strand. Therefore, it is no longer necessary to align the detection end of the distance sensor 1 with the steel strand, further reducing the cumbersomeness and labor intensity of the detection work. In addition, since the steel strands protruding from the prestressed jacks are located inside the fixed cylinder 3 and the insertion cylinder 6, the part of the steel strands protruding from the prestressed jacks is not exposed to the external environment, so as to protect the ends of the steel strands.

[0032] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A tension detection device for steel strand, comprising a fixing plate (2) equipped with a distance sensor (1), characterized in that: A fixing cylinder (3) is provided on one side of the fixing plate (2). The fixing plate (2) is connected to one end of the fixing cylinder (3). A first spring (4) and a circular plate (5) are arranged sequentially inside the fixing cylinder (3) in a direction away from the fixing plate (2). The detection end of the distance sensor (1) faces the circular plate (5). The two sides of the first spring (4) are in contact with the circular plate (5) and the fixing plate (2) respectively. The diameter of the circular plate (5) matches the inner diameter of the fixing cylinder (3). A fixing cylinder (3) is provided at the end away from the fixing plate (2). A limiting ring is installed in the inner cavity of the fixed cylinder (3). The circular plate (5) is in contact with the limiting ring. An insertion cylinder (6) is provided on the side of the circular plate (5) away from the first spring (4). The inner diameter of the insertion cylinder (6) is not greater than the inner diameter of the limiting ring. A fixing ring (7) is fitted on the insertion cylinder (6) close to the fixed cylinder (3). The insertion cylinder (6) is connected to the fixed cylinder (3) through the fixing ring (7). A threaded hole is opened on the side wall of the insertion cylinder (6). A first bolt (8) is threaded in the threaded hole.

2. The tension testing device for steel strands according to claim 1, characterized in that: A support cylinder (9) is movably fitted on the fixed cylinder (3). Two support grooves (10) are opened on the support cylinder (9). Both support grooves (10) are opened along one end of the support cylinder (9) to the other end of the support cylinder (9). The two support grooves (10) are located on both sides of the support cylinder (9). A fixing rod (11) is movably fitted in each of the two support grooves (10). One end of the fixing rod (11) is installed on the side wall of the fixed cylinder (3). The other end of the fixing rod (11) passes through the support groove (10). A nut (12) is threaded on the fixing rod (11). One side of the nut (12) is in contact with the outer wall of the support cylinder (9). The fixing rod (11) is clamped on the support cylinder (9) by the nut (12). The fixing ring (7) is connected to the fixed cylinder (3) through the support cylinder (9).

3. The tension testing device for steel strands according to claim 2, characterized in that: The support cylinder (9) is threaded with a first cylinder cover (13) with an open top on the side away from the distance sensor (1). A fixing ring (7) is fitted inside the first cylinder cover (13). The two sides of the fixing ring (7) are in contact with the bottom plate of the first cylinder cover (13) and the end of the support cylinder (9), respectively. A through hole is provided on the bottom plate of the first cylinder cover (13). The through hole is fitted on the insertion cylinder (6). The diameter of the through hole matches the outer wall diameter of the insertion cylinder (6). The outer wall diameter of the insertion cylinder (6) is not greater than the outer wall diameter of the fixing ring (7). An arc-shaped handle (14) is provided on the outside of the support cylinder (9). The bottom end of the handle (14) is installed on the outer wall of the support cylinder (9).

4. The tension testing device for steel strands according to claim 2, characterized in that: A labeling layer (15) is provided on one side of the support groove (10). The labeling layer (15) is installed on the outer wall of the support cylinder (9). The labeling layer (15) extends along one end of the support cylinder (9) to the other end of the support cylinder (9). A second spring (16) is provided on the side of the fixing rod (11) close to the distance sensor (1). The second spring (16) is located inside the support cylinder (9) and is fitted on the fixing cylinder (3). A support ring (17) is provided on the side of the second spring (16) away from the fixing rod (11). The support ring (17) is installed on the inner wall of the support cylinder (9). The inner diameter of the support ring (17) matches the outer diameter of the fixing cylinder (3). The support ring (17) is movably fitted on the fixing cylinder (3). The two ends of the second spring (16) are in contact with the support ring (17) and the fixing rod (11) respectively.

5. The tension testing device for steel strands according to claim 1, characterized in that: The fixed cylinder (3) is threaded with a second cylinder cover (18) with an open top on the side away from the circular plate (5). The fixed plate (2) adopts a circular plate structure and is fitted inside the second cylinder cover (18). The diameter of the fixed plate (2) matches the inner diameter of the second cylinder cover (18). The two sides of the fixed plate (2) are in contact with the end of the fixed cylinder (3) and the bottom plate of the second cylinder cover (18), respectively.

6. The tension testing device for steel strands according to claim 1, characterized in that: A sleeve (19) is provided in the middle of the fixed plate (2). One end of the sleeve (19) is installed on the fixed plate (2). The distance sensor (1) is fitted inside the sleeve (19). A sleeve hole is provided on the side wall of the sleeve (19). A second bolt (20) is threaded inside the sleeve hole. The distance sensor (1) is pressed and fixed inside the sleeve (19) by the second bolt (20).

7. The tension testing device for steel strands according to claim 1, characterized in that: The first bolt (8) is threaded with a fixing tube (21). One end of the fixing tube (21) is installed on the outer wall of the insertion tube (6). The inner cavity of the fixing tube (21) is connected to the threaded hole on the insertion tube (6).

Images