Positioning device for bridge steel bar welding

Abstract

The invention provides a positioning device for bridge steel bar welding. The positioning device comprises an electric guide rail; two groups of sliding brackets; a motor; the multi-diameter length auxiliary mechanism is arranged on the inner sides of the two groups of sliding brackets and comprises a turntable and a plurality of sliding columns uniformly distributed on the turntable; the motor is in driving connection with a threaded rod through a transmission mechanism, the threaded rod is in threaded connection with a threaded sleeve, and the threaded sleeve is hinged to the sliding columns through multiple sets of connecting rods. The semicircular blocks are arranged at the ends, away from the connecting rods, of the sliding columns and abut against the inner walls of the annular steel bars; the pressure sensor is arranged on the radial moving path of the sliding column, and the pressure sensor is configured to send out a signal when the semicircular block makes contact with the annular steel bar and reaches preset pressure; the locking mechanism responds to a signal of the pressure sensor and is configured to selectively lock the axial position of the threaded sleeve or lock the circumferential position of the rotary disc. According to the steel reinforcement cage welding device, all-adaptive adjustment of steel reinforcement cages of different specifications is achieved, and the welding efficiency and quality are greatly improved.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a positioning device for welding bridge steel bars. Background Technology

[0002] A reinforcing cage is a steel reinforcement framework used in building construction (especially concrete structures such as pile foundations, piers, and wall panels) to enhance the tensile strength of concrete. Its core function is to work in conjunction with the concrete to bear structural loads (such as tensile and shear forces) and prevent the concrete from cracking or failing. Its composition needs to be determined in conjunction with engineering design requirements (such as structural dimensions, stress level, and seismic standards), and it is generally composed of longitudinal main bars and ring stirrups.

[0003] In bridge construction projects, the steel reinforcement cage is a key component of the core load-bearing structure of bridge pile foundations, piers, etc., and its welding quality directly determines the overall load-bearing capacity and service life of the bridge.

[0004] In bridge construction, steel cages with diameters ranging from 1.2m to 3m and lengths ranging from 6m to 30m are used depending on the requirements of different parts (such as pile foundations and cap beams). Traditional positioning methods require the manual construction of temporary supports, and the support dimensions are repeatedly adjusted for different specifications of steel cages. This is not only time-consuming and labor-intensive (the average time to build a single set of steel cage supports is 2 to 3 hours), but also makes it difficult to guarantee the stability of the supports. Size deviations can easily lead to the verticality and roundness of the steel cages exceeding the standards after they are formed, requiring secondary rework and correction. Summary of the Invention

[0005] To address the problems of traditional rebar cage positioning methods that require manual construction of temporary supports and repeated adjustments to the support dimensions for different rebar cage specifications, which are time-consuming and labor-intensive, this application provides a positioning device for bridge rebar welding.

[0006] The positioning device for welding bridge steel bars provided in this application adopts the following technical solution: A positioning device for welding bridge steel bars, comprising: Electric guide rails; Two sets of sliding brackets are slidably connected to the electric guide rail, which is configured to drive the two sets of sliding brackets to move closer or further apart to adjust their spacing. The motor is fixedly connected to one of the sliding brackets; A multi-diameter length auxiliary mechanism is disposed inside two sets of sliding supports. The multi-diameter length auxiliary mechanism includes a turntable and multiple sliding columns evenly distributed on the turntable. The motor is driven by a threaded rod through a transmission mechanism. A threaded sleeve is threadedly connected to the threaded rod. The threaded sleeve is hinged to multiple sliding columns through multiple sets of connecting rods. A semi-circular block is located at the end of the sliding column away from the connecting rod, and is used to abut against the inner wall of the annular steel bar; A pressure sensor, disposed along the radial movement path of the sliding column, is configured to emit a signal when the semicircular block contacts the annular reinforcing bar and reaches a preset pressure; and A locking mechanism, which responds to a signal from the pressure sensor, is configured to selectively lock the axial position of the threaded sleeve or the circumferential position of the turntable.

[0007] Furthermore, the transmission mechanism includes: The first pulley is coaxially fixed to the output shaft of the motor; The second pulley is connected to the first pulley via a belt; the threaded rod is coaxially and fixedly connected to the second pulley.

[0008] Furthermore, the transmission mechanism also includes a telescopic transmission shaft, which comprises: The main rotating rod is coaxially and fixedly connected to the side of the first pulley away from the motor; The auxiliary rotating rod is slidably inserted inside the main rotating rod and can rotate synchronously with the main rotating rod; The auxiliary rotating rod is driven to connect with the turntable on another set of sliding brackets to achieve synchronous rotation of the turntables on the two sets of sliding brackets.

[0009] Furthermore, the locking mechanism includes: The guide rod is fixedly mounted on the turntable, and its surface has multiple sets of slots along the axial direction; An electric insertion rod is mounted on a connecting post that is fixedly connected to the threaded sleeve, and is configured such that when the pressure sensor sends a signal, its telescopic end can be inserted into or disengaged from the slot of the guide rod to lock or release the axial position of the threaded sleeve. An electric friction block is disposed on the sliding bracket and configured to contact the outer arc surface of the turntable to limit its rotation when the pressure sensor does not emit a signal, and to disengage from the turntable when the pressure sensor emits a signal.

[0010] Furthermore, a rebar clamping assembly is provided on the sliding column, the rebar clamping assembly comprising: A movable plate is fixedly connected to the top of the sliding column; Two protruding rods pass through and are slidably connected in the straight grooves opened on the movable plate; Two sliders are respectively fixedly connected to one of the aforementioned protruding rods; Two contact blocks are elastically connected to the inside of one of the sliders via return springs; The inner wall of the turntable is provided with a figure-eight groove that slides with the end of the protruding rod. When the sliding column moves radially outward, the moving plate drives the protruding rod to slide along the figure-eight groove, forcing the two sliders to move closer to each other, thereby driving the two contact blocks to clamp the longitudinal steel bar located therebetween.

[0011] Furthermore, the contact block is slidably connected to the inner side of the slider, and one end of the reset spring is fixedly connected to the inner wall of the slider and the other end is fixedly connected to the outer wall of the contact block.

[0012] Furthermore, the connecting post is slidably sleeved on the guide rod, and the guide rod guides the axial movement of the threaded sleeve.

[0013] Furthermore, the threaded rod is rotatably connected to the center of the rear end of the turntable, and the sliding column passes through and is slidably connected to the radial channel of the turntable.

[0014] Furthermore, when the locking mechanism locks the axial position of the threaded sleeve, the motor continues to drive the threaded rod to rotate, thereby causing the entire turntable and the clamped steel bar to rotate around the axis of the threaded rod.

[0015] Furthermore, the pressure sensor is embedded in the inner wall of the top of the semicircular block to detect the contact pressure with the annular reinforcing bar.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention achieves full adaptability adjustment for steel cages of different specifications through the coordinated design of electric guide rail and multi-diameter length auxiliary mechanism. The electric guide rail can drive two sets of sliding brackets to move laterally along the guide rail, and quickly adjust the spacing according to the length of the steel cage. The adjustment process does not require manual erection of brackets. At the same time, in the multi-diameter length auxiliary mechanism, the motor drives the threaded rod to move the threaded sleeve, and pushes the sliding column and the semi-circular block to extend and retract radially along the turntable through the connecting rod, which can adapt to ring steel bars of different diameters. Moreover, the semi-circular block is linked with the pressure sensor, which can automatically detect the inner diameter of the ring steel bar and accurately position it without the need for manual measurement and adjustment. 2. In terms of radial support, the semicircular block moves with the sliding column until it fits against the inner diameter of the annular rebar. The pressure sensor provides real-time feedback of the pressure signal, which controls the electric inserter to insert into the guide rod slot to fix the threaded sleeve position. This ensures the stability of the semicircular block's support force on the annular rebar and prevents radial displacement of the annular rebar during welding. In terms of radial clamping, the sliding column moves synchronously with the moving plate. The protruding rod slides along the V-shaped groove and drives the sliders to move closer together. The contact block applies elastic pressure to the longitudinal main rebar under the action of the return spring, achieving a tight fit between the main rebar and the stirrup. 3. After the threaded sleeve is fixed, the motor drives the threaded rod to rotate the turntable through the connecting column and the guide rod. The sliding cooperation between the main rotating rod and the auxiliary rotating rod ensures that the two sets of turntables rotate synchronously, which can drive the steel cage to rotate 360° at a uniform speed. Workers do not need to frequently change their positions around the steel cage and only need to complete the welding operation at a fixed position. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the right sliding bracket and the electric guide rail separated in an embodiment of this application; Figure 3 This is a schematic diagram of the main rotating rod and the auxiliary rotating rod in the separated state according to an embodiment of this application; Figure 4 This is a partial cross-sectional view of the sliding bracket according to an embodiment of this application; Figure 5 This is a partial cross-sectional view of the upper end of the turntable in an embodiment of this application; Figure 6 This is a three-dimensional schematic diagram of the figure-eight inclined groove in an embodiment of this application; Figure 7 This is a partial cross-sectional view of the slider structure according to an embodiment of this application.

[0019] Figure label: 1. Electric guide rail; 2. Sliding bracket; 3. Motor; 4. Multi-diameter length auxiliary mechanism; 401. First pulley; 402. Main rotating rod; 403. Secondary rotating rod; 404. Second pulley; 405. Threaded rod; 406. Threaded sleeve; 407. Turntable; 408. Connecting rod; 409. Guide rod; 410. Electric insertion rod; 411. Electric friction block; 412. Sliding column; 413. Semicircular block; 414. Moving plate; 415. Herringbone groove; 416. Slider; 417. Return spring; 418. Contact block; 419. Pressure sensor; 420. Connecting column; 421. Protruding rod. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Reference Figures 1-7 This application discloses a positioning device for welding bridge steel bars, which includes: Electric guide rail 1, its specific technology is conventional and needs no further explanation.

[0022] Two sets of sliding brackets 2 are slidably connected to the electric guide rail 1. The electric guide rail 1 is configured to drive the two sets of sliding brackets 2 to move closer or further apart to adjust their spacing. Specifically, the sliding bracket 2 is a frame that is slidably set on the electric guide rail 1 and a cylindrical body that is fixed to the frame and is in the shape of an annular ring.

[0023] The motor 3 is fixedly connected to one of the sliding brackets 2. The sliding bracket 2 is fixedly connected to a mounting bracket at its lower part away from the other sliding bracket 2, and the motor 3 is fixedly connected to the mounting bracket.

[0024] A multi-diameter length auxiliary mechanism 4 is disposed on the inner arc side of the cylinder of the two sets of sliding supports 2, and is used to assemble multiple sets of steel bars and circular steel bars into a column shape and weld them into a steel cage on its surface. The multi-diameter length auxiliary mechanism 4 includes a turntable 407 rotatably mounted on the inner arc side of the cylinder of the sliding support 2 and multiple sliding columns 412 evenly distributed on the turntable 407. The turntable 407 has multiple radial grooves arranged along its radial direction, and the sliding columns 412 slide in the radial grooves. A threaded rod 405 is rotatably mounted on the central axis of the turntable 407 through a bearing, which is opposite to the other turntable 407. The motor 3 is connected to the threaded rod 405 through a transmission mechanism. The threaded rod 405 is provided with a threaded sleeve 406, which is hinged to the multiple sliding columns 412 through multiple sets of connecting rods 408.

[0025] The semicircular blocks 413 are slidably mounted on the turntable 407 and located at the end of the sliding column 412 away from the connecting rod 408, and are used to abut against the inner wall of the annular steel bar. The number of these blocks is equal to the number of the sliding columns 412.

[0026] Pressure sensor 419 is located on the radial movement path of sliding column 412. Pressure sensor 419 is configured to send a signal when semicircular block 413 contacts annular steel bar and reaches a preset pressure.

[0027] The locking mechanism, which responds to a signal from the pressure sensor 419, is configured to selectively lock the axial position of the threaded sleeve 406 or the circumferential position of the turntable 407.

[0028] Reference Figure 2 and Figure 3 Furthermore, the multi-diameter length auxiliary mechanism 4 also includes a first pulley 401 and a second pulley 404, which are connected on the same side by belt drive. A main rotating rod 402 and an auxiliary rotating rod 403 are coaxially fixed to opposite sides of the two first pulleys 401, respectively. Both the main rotating rod 402 and the auxiliary rotating rod 403 are arranged along the length direction of the electric guide rail 1, and the auxiliary rotating rod 403 passes through the main rotating rod 402. The auxiliary rotating rod 403 can slide along the axial direction of the main rotating rod 402 and rotate in sync with the main rotating rod 402. The output shaft of the motor 3 is coaxially fixed to one of the first pulleys 401, and the second pulley 404 is coaxially fixed to the end of the threaded rod 405 opposite to the turntable 407.

[0029] In addition, refer to Figure 2 , Figure 4 and Figure 7 The aforementioned locking mechanism includes a connecting post 420 fixedly connected to the outer peripheral wall of the arc surface of the threaded sleeve 406, the connecting post 420 being radially arranged along the turntable 407; a guide rod 409 along its axial direction is fixedly connected to the side of the turntable 407 near the connecting post 420, and multiple slots are spaced apart on the guide rod 409 along its length. An electric insertion rod 410 is provided at the end of the connecting post 420 away from the threaded sleeve 406, which is adapted to be inserted into the multiple slots on the guide rod 409. The locking mechanism also includes an electric friction block 411, which is located on the inner arc side of the upper cylinder of the sliding bracket 2, and the friction part of the electric friction block 411 is in contact with the outer arc surface of the turntable 407. The aforementioned pressure sensor 419 is located on the inner side wall of the arc apex of the semicircular block 413, and the pressure sensor 419, the electric friction block 411, and the electric insertion rod 410 are all electrically connected.

[0030] Reference Figure 4 , Figure 5 and Figure 7 The sliding column 412 and the semicircular block 413 are fixedly connected to the two opposite side walls of the sliding plate 414. The surface of the sliding plate 414 is provided with two sets of straight grooves. The inner walls of the two sets of straight grooves of the sliding plate 414 are slidably connected with protruding rods 421. The surface of the protruding rods 421 is fixedly connected with sliders 416. The inner side wall of the sliders 416 is elastically connected with contact blocks 418 through a return spring 417. The two contact blocks 418 on the two sliding plates 414 are arranged opposite to each other. The inner side wall of the turntable 407 near the straight grooves on the sliding plate 414 is provided with a figure-eight groove 415. The closing end of the figure-eight groove 415 is set away from the axis of the turntable 407. The two protruding rods 421 on the two sliding plates 414 are slidably arranged in the figure-eight groove 415.

[0031] Specifically, one end of the return spring 417 is fixedly connected to the inner side wall of the slider 416, and the other end of the return spring 417 is fixedly connected to the outer wall of the contact block 418. The contact block 418 is slidably connected to the inner side wall of the slider 416. The function of the return spring 417 is to provide elastic support to the contact block 418 after it comes into contact with the steel bar, so that it always keeps in contact with the steel bar.

[0032] Therefore, when the first pulley 401 is rotated by the output shaft of the motor 3, it will be transmitted to the second pulley 404 through the belt, so that the second pulley 404 will rotate synchronously with it; and the rotation center shaft of the second pulley 404 is fixedly connected to the threaded rod 405, so that when the second pulley 404 rotates, it will drive the threaded rod 405 to rotate synchronously. The threaded rod 405 is rotatably connected to the center of the rear end of the turntable 407. A threaded sleeve 406 is threaded onto the surface of the threaded rod 405. The inner side of the threaded sleeve 406 has an internal thread groove. Rotation of the threaded rod 405 causes the threaded sleeve 406 to move threadedly on its surface. Multiple sets of connecting rods 408 are hinged to the outer sidewall of the threaded sleeve 406. A sliding column 412 is hinged to the end of each connecting rod 408 away from the threaded sleeve 406. This allows the threaded sleeve 406 to move back and forth, pushing the sliding column 412 outward from the inside of the turntable 407 via the connecting rods 408. This simultaneously pushes the inner reinforcing bars inserted into the turntable 407 outward, bringing them into contact with the inner diameter of the annular reinforcing bars in the reinforcing cage, thus providing stable support and preventing displacement of the annular reinforcing bars. Furthermore, rotation of the turntable 407 allows the contact points between the multiple sets of reinforcing bars inserted into the turntable 407 and the annular reinforcing bars to rotate, facilitating welding.

[0033] The first pulley 401 is fixedly connected to the rotation center shaft at the end away from the motor 3 by a main rotating rod 402. The inner side wall of the main rotating rod 402 is slidably connected to a secondary rotating rod 403. The inner side of the main rotating rod 402 has an inner protrusion that matches the outer diameter of the secondary rotating rod 403. When the main rotating rod 402 and the secondary rotating rod 403 move away from each other, the secondary rotating rod 403 will move inside the main rotating rod 402. The rotation of the main rotating rod 402 can still drive the secondary rotating rod 403 to rotate, thus realizing the synchronous transmission connection of the two turntables 407.

[0034] Because the inner sidewall of the turntable 407 has a herringbone groove 415, the sliding column 412 is slidably connected to the inner sidewall of the turntable 407. When the sliding column 412 drives the moving plate 414 to move upward, it also drives the two protruding rods 421 to move inside the herringbone groove 415. And through the guidance of the herringbone groove 415, the two sets of protruding rods 421 drive the slider 416 to move closer to each other on the inner wall of the straight groove of the moving plate 414, thereby clamping and pressing the rebar. As the semicircular block 413 contacts the rebar and moves with the outer ring of the rebar, the two sets of contact blocks 418 will always be in contact with the rebar, thereby pressing the rebar. At the same time, after the pressure sensor 419 detects that the rebar is clamped, it will transmit an electrical signal to the electric insertion rod 410 to make it insert into the slot on the surface of the guide rod 409, and at the same time transmit an electrical signal to the electric friction block 411 to release the contact friction limit with the turntable 407.

[0035] The implementation principle of a positioning device for bridge steel bar welding in this application embodiment is as follows: When the bridge rebar welding positioning device is working, it first determines the support shape of the multi-diameter rebar cage: the electric guide rail 1 drives the two sets of sliding brackets 2 to move closer or further apart, adjusting the spacing according to the length of the rebar cage to be welded; the motor 3 at the rear end of the right sliding bracket 2 starts, and its output shaft drives the first pulley 401 to rotate, which is then transmitted to the second pulley 404 via belt to rotate synchronously. The second pulley 404 drives the threaded rod 405 to rotate accordingly, causing the threaded sleeve 406 to move back and forth along the guide rod 409; the threaded sleeve 406 pushes the sliding column 412 to move outward along the turntable 407 through the connecting rod 408, and the sliding column 412 drives the semicircular block 413 to move synchronously until the semicircular block 413 contacts the inner diameter of the annular rebar of the rebar cage; at this time, the pressure sensor 419 at the top of the semicircular block 413 detects the pressure and transmits an electrical signal to insert the telescopic end of the electric insertion rod 410 into the slot on the surface of the guide rod 409, fixing the position of the threaded sleeve 406, and at the same time controlling the electric friction block 411 to disengage from the outer arc surface of the turntable 407, releasing the rotation restriction.

[0036] Next, the clamping, fixing, and rotating welding of the reinforcing bars are achieved: when the sliding column 412 moves outward, it synchronously drives the moving plate 414 to move. The protruding rod 421 in the straight groove of the moving plate 414 slides along the V-shaped inclined groove 415 of the turntable 407. Under the guidance of the inclined groove, the two sets of sliders 416 move closer to each other. The contact block 418, which is elastically connected to the inner side of the slider 416 through the return spring 417, contacts the reinforcing bar and applies elastic pressure, thus completing the clamping and fixing of the reinforcing bar. Subsequently, the motor 3 continues to drive, and since the threaded sleeve 406 is fixed, the threaded rod 4... 05 The turntable 407 is rotated by the connecting column 420 and the guide rod 409. The main rotating rod 402 drives the auxiliary rotating rod 403 to rotate synchronously, so that the two sets of turntables 407 rotate synchronously to adjust the welding point of the steel bar and the ring steel bar. During the welding process, if it is necessary to change the diameter of the steel cage, the electric insertion rod 410 disengages from the slot, the electric friction block 411 contacts the turntable 407 to fix its position, and the threaded rod 405 drives the threaded sleeve 406 to move. The above support and clamping actions are repeated to realize the welding positioning of steel cages with different diameters.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A positioning device for welding bridge reinforcing bars, characterized in that, include: Electric guide rails; Two sets of sliding brackets are slidably connected to the electric guide rail, which is configured to drive the two sets of sliding brackets to move closer or further apart to adjust their spacing. The motor is fixedly connected to one of the sliding brackets; A multi-diameter length auxiliary mechanism is disposed inside two sets of sliding supports. The multi-diameter length auxiliary mechanism includes a turntable and multiple sliding columns evenly distributed on the turntable. The motor is driven by a threaded rod through a transmission mechanism. A threaded sleeve is threadedly connected to the threaded rod. The threaded sleeve is hinged to multiple sliding columns through multiple sets of connecting rods. A semi-circular block is located at the end of the sliding column away from the connecting rod, and is used to abut against the inner wall of the annular steel bar; A pressure sensor is located on the radial movement path of the sliding column, and the pressure sensor is configured to emit a signal when the semicircular block contacts the annular steel bar and reaches a preset pressure. as well as A locking mechanism, which responds to a signal from the pressure sensor, is configured to selectively lock the axial position of the threaded sleeve or the circumferential position of the turntable.

2. The positioning device for bridge steel reinforcement welding according to claim 1, characterized in that, The transmission mechanism includes: The first pulley is coaxially fixed to the output shaft of the motor; The second pulley is connected to the first pulley via a belt; the threaded rod is coaxially and fixedly connected to the second pulley.

3. The positioning device for bridge steel reinforcement welding according to claim 2, characterized in that, The transmission mechanism further includes a retractable transmission shaft, which comprises: The main rotating rod is coaxially and fixedly connected to the side of the first pulley away from the motor; The auxiliary rotating rod is slidably inserted inside the main rotating rod and can rotate synchronously with the main rotating rod; The auxiliary rotating rod is driven to connect with the turntable on another set of sliding brackets to achieve synchronous rotation of the turntables on the two sets of sliding brackets.

4. The positioning device for bridge steel reinforcement welding according to claim 1, characterized in that, The locking mechanism includes: The guide rod is fixedly mounted on the turntable, and its surface has multiple sets of slots along the axial direction; An electric insertion rod is mounted on a connecting post that is fixedly connected to the threaded sleeve, and is configured such that when the pressure sensor sends a signal, its telescopic end can be inserted into or disengaged from the slot of the guide rod to lock or release the axial position of the threaded sleeve. An electric friction block is disposed on the sliding bracket and configured to contact the outer arc surface of the turntable to limit its rotation when the pressure sensor does not emit a signal, and to disengage from the turntable when the pressure sensor emits a signal.

5. A positioning device for bridge steel reinforcement welding according to claim 1, characterized in that, The sliding column is provided with a steel bar clamping assembly, the steel bar clamping assembly comprising: A movable plate is fixedly connected to the top of the sliding column; Two protruding rods pass through and are slidably connected in the straight grooves opened on the movable plate; Two sliders are respectively fixedly connected to one of the aforementioned protruding rods; Two contact blocks are elastically connected to the inside of one of the sliders via return springs; The inner wall of the turntable is provided with a figure-eight groove that slides with the end of the protruding rod. When the sliding column moves radially outward, the moving plate drives the protruding rod to slide along the figure-eight groove, forcing the two sliders to move closer to each other, thereby driving the two contact blocks to clamp the longitudinal steel bar located therebetween.

6. A positioning device for bridge steel reinforcement welding according to claim 5, characterized in that, The contact block is slidably connected to the inner side of the slider, and one end of the reset spring is fixedly connected to the inner wall of the slider and the other end is fixedly connected to the outer wall of the contact block.

7. A positioning device for bridge steel reinforcement welding according to claim 4, characterized in that, The connecting post is slidably sleeved on the guide rod, and the guide rod guides the axial movement of the threaded sleeve.

8. A positioning device for bridge steel reinforcement welding according to claim 1, characterized in that, The threaded rod is rotatably connected to the center of the rear end of the turntable, and the sliding column passes through and is slidably connected to the radial channel of the turntable.

9. A positioning device for bridge steel reinforcement welding according to claim 1, characterized in that, When the locking mechanism locks the axial position of the threaded sleeve, the motor continues to drive the threaded rod to rotate, thereby causing the entire turntable and the clamped steel bar to rotate around the axis of the threaded rod.

10. A positioning device for bridge steel reinforcement welding according to claim 1, characterized in that, The pressure sensor is embedded in the inner wall of the top of the semicircular block and is used to detect the contact pressure with the annular steel bar.

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