Welding device for preventing deformation of reinforcement cage for bridge construction

Abstract

The invention relates to the technical field of welding equipment, in particular to a welding device for preventing deformation of a reinforcement cage for bridge construction. Comprising a bidirectional sliding table and two supporting mechanisms, and each supporting mechanism comprises a rotating disc, a plurality of radial limiting structures, a plurality of supporting structures and a diameter adjusting mechanism; the plurality of radial limiting structures are arranged on the turntable; the multiple supporting structures correspond to the multiple radial limiting structures correspondingly. The diameter adjusting mechanism comprises a mounting disc, a plurality of transmission assemblies, a plurality of pre-tightening adjusting structures and a rotary driving structure, the transmission assemblies are arranged in a plurality of sliding grooves of the mounting disc respectively, the pre-tightening adjusting structures are used for pre-clamping reinforcing steel bars, and the rotary driving structure is used for adjusting the diameter of the reinforcing steel bar cage; the rotary table, the rotary driving assembly, the multiple radial limiting structures, the multiple supporting structures and the diameter adjusting mechanism are arranged, so that the position of the steel bar does not need to be subjected to secondary adjustment subsequently, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention application relates to the field of welding equipment technology, specifically to a welding device for preventing deformation of steel cages used in bridge construction. Background Technology

[0002] In bridge construction, the reinforcing cage, as a core component of pile foundation construction, directly affects the bearing capacity of the pile foundation and the overall structural stability of the project. With bridge construction trending towards longer spans and deeper pile foundations, higher demands are placed on the dimensional accuracy, structural strength, and forming stability of the reinforcing cage. Currently, the welding devices used for reinforcing cages in bridge construction are mostly traditional fixed or semi-fixed structures, which have gradually revealed many problems that urgently need to be addressed in practical applications.

[0003] Patent CN119175521B discloses a welding device for steel reinforcement cages used in bridge construction. This device mainly consists of a base, a welding robot, a rotating mechanism, a positioning mechanism, and a locking mechanism. The core load-bearing component is a disc frame. Multiple receiving slots are evenly spaced along the inner circumference of the disc frame for batch placement of the longitudinal reinforcement bars of the steel reinforcement cages. A central support plate is located below the disc frame. The outer circumference of the central support plate has grooves corresponding to the receiving slots. Adjusting heads are slidably mounted within the grooves, and rollers are rotatably mounted on the top of the adjusting heads, allowing the longitudinal reinforcement bars to pass through the rollers. The longitudinal reinforcement bars pass through and overlap on the rollers; at the same time, an elastic pad is fixed in the receiving groove by a spring, and the elastic pad fits against the surface of the longitudinal reinforcement bar to limit the radial position of the longitudinal reinforcement bar; after all the longitudinal reinforcement bars are placed in the receiving groove, the central support plate is rotated by the rotating mechanism, and the push rod at the bottom of the adjusting head slides along the arc groove on the locking plate, thereby driving the adjusting head to move along the slide groove, so as to realize the synchronous adjustment of the radial position of all the longitudinal reinforcement bars to match the diameter of the target steel cage; after the diameter is adjusted to the correct position, the adjusting head is locked by the locking mechanism, and finally the welding robot completes the welding operation of the longitudinal reinforcement bar and the ring reinforcement bar.

[0004] Although the above solution achieves welding compatibility for steel cages of different diameters, it adopts a work mode of batch placement of steel bars followed by unified clamping and diameter adjustment. That is, all steel bars must be placed into the receiving slot of the disc frame before the steel bars can be clamped and the diameter adjusted by the cooperation of the adjusting head and the elastic pad. During the process of placing steel bars one by one, the vibration generated when the subsequent steel bars are inserted into the receiving slot can easily be transmitted to the already placed steel bars. At this time, the already placed steel bars are not immediately fixed, which can easily cause axial movement, radial displacement or circumferential rotation, resulting in deviation of the position of the steel bars in the receiving slot. Therefore, it is necessary to perform secondary correction of the axial position of each steel bar after all steel bars have been placed. Summary of the Invention

[0005] To address the aforementioned issues, a welding device for preventing deformation of steel reinforcement cages in bridge construction is provided. By incorporating a turntable, a rotation drive assembly, multiple radial limiting structures, multiple support structures, and a diameter adjustment mechanism, the device eliminates the need for subsequent secondary adjustments to the position of the steel reinforcement, thereby improving construction efficiency.

[0006] To address the problems of existing technologies, this invention provides a welding device for preventing deformation of steel reinforcement cages used in bridge construction. The device includes a bidirectional slide table and two support mechanisms positioned between two welding robots. The bidirectional slide table is used to adjust the distance between the two support mechanisms. Each support mechanism includes a turntable, multiple radial limiting structures, multiple support structures, and a diameter adjustment mechanism. The turntable has multiple placement slots, and a rotation drive assembly is located on one side of the turntable to drive it to rotate around its own axis. Multiple radial limiting structures are disposed on the turntable and correspond to the multiple placement slots, respectively. These radial limiting structures restrict the steel reinforcement from moving along the turntable. The movement is diametrically oriented; multiple support structures correspond to multiple radial limiting structures respectively, and the support structure is located at the end of the radial limiting structure near the center of the turntable; the diameter adjustment mechanism includes a mounting plate, multiple transmission components, multiple pre-tightening adjustment structures, and a rotary drive structure. The mounting plate is coaxial with and parallel to the turntable. Multiple grooves are provided on the mounting plate. Multiple transmission components are respectively located in the multiple grooves. The pre-tightening adjustment structure is used to drive the radial limiting structure and the support structure to pre-clamp the reinforcing bars. The rotary drive structure is used to drive the mounting plate to rotate and adjust the diameter of the cylinder formed by the multiple reinforcing bars.

[0007] Preferably, the radial limiting structure includes two cross limiting components symmetrically arranged about the placement slot. The cross limiting component includes a mounting block, a limiting arm, and an elastic support arm. One end of the limiting arm is rotatably connected to the mounting block. The elastic support arm is used to provide a thrust to the limiting arm toward the placement slot.

[0008] Preferably, the radial limiting structure further includes two radial adaptive components, which are respectively connected to two mounting blocks. Each radial adaptive component includes a guide rod and a spring. The guide rod is arranged parallel to the placement groove, and the mounting block is slidably disposed on the guide rod. The spring is used to provide a thrust to the mounting block toward the center of the turntable.

[0009] Preferably, the cross-limiting assembly further includes a limiting rod, which is mounted on the limiting arm and is used to prevent the elastic support arm from pushing the limiting arm to rotate.

[0010] Preferably, the support structure includes a telescopic rod, a support plate, and a plurality of rollers; the telescopic rod is slidably connected to the turntable, and the axis of the telescopic rod passes through the center of the turntable; the support plate is connected to the telescopic rod; and the plurality of rollers are equally spaced on the support plate.

[0011] Preferably, the support structure further includes two limiting plates, which are respectively disposed on both sides of the support plate. The limiting plates are provided with limiting grooves, and the support plate cooperates with the limiting grooves to prevent the support plate from rotating around the axis of the telescopic rod.

[0012] Preferably, the transmission assembly includes a connecting rod and a connecting block; one end of the connecting rod is connected to the support structure; the connecting block is slidably disposed in a groove, and an inclined groove is formed on the connecting block; the connecting rod is slidably disposed in the inclined groove and contacts the bottom of the inclined groove.

[0013] Preferably, the preload adjustment structure includes a lead screw, a connecting block, and a rotating handle; the lead screw is arranged parallel to one side of the slide groove; the connecting block is threadedly connected to the lead screw and is also connected to the transmission assembly; the rotating handle is connected to the lead screw.

[0014] Preferably, the rotary drive structure includes an external gear ring, a gear, and a rotary driver; the external gear ring is coaxially connected to the mounting plate; the gear meshes with the external gear ring; the rotary driver is disposed on the turntable, and the output end of the rotary driver is connected to the gear.

[0015] Preferably, the placement groove is opened along the diameter direction of the turntable and extends to the edge of the turntable to form an entrance.

[0016] The advantages of this invention application compared to the prior art are:

[0017] 1. This invention application includes a turntable, a rotation drive assembly, multiple radial limiting structures, multiple support structures, and a diameter adjustment mechanism. The rotation drive assembly drives the turntable to rotate, allowing any placement slot to be rotated to a vertically upward position, thus enabling orderly switching of placement slots. The radial limiting structure, support structure, and diameter adjustment mechanism, in conjunction with the transmission assembly and pre-tightening adjustment structure, form a bidirectional clamping structure, achieving initial fixation of a single rebar and ensuring the stability of the placed rebar during subsequent turntable rotation and rebar placement. The rotation drive structure drives the installation disc to rotate, and through the transmission assembly, synchronously drives all support structures and radial limiting structures to achieve synchronous adjustment of the diameter of all rebars forming a cylinder. By adopting a work mode of placing rebars one by one and immediate pre-clamping fixation, this invention effectively solves the problem of vibration interference to the placed rebars caused by batch placement and uniform fixation in traditional devices, thus eliminating the need for secondary adjustments to the rebar positions and improving construction efficiency.

[0018] 2. This invention application sets up two cross-limiting components. When the rebar slides down, gravity is converted into a lateral thrust that pushes the limiting arm to separate. When the thrust is greater than the thrust of the elastic support arm, the limiting arm automatically separates to form a through channel, realizing the smooth sliding of the rebar. After the rebar is in place, the thrust disappears, and the limiting arm resets under the action of the elastic support arm. When the support structure pushes the rebar upward, the elastic support arm drives the limiting arm to form a lateral compression on the rebar, forming a bidirectional constraint with the upward pushing force of the support structure, thereby realizing the pre-clamping and fixing of rebars of different diameters.

[0019] 3. This invention application sets up two radial adaptive components. The power of the rotation drive structure drives all the supporting structures to push the steel bars outward synchronously through the mounting plate and transmission components. At the same time, the sliding and positioning of the mounting block is realized through the radial adaptive components. The whole process ensures that the radial movement distance of all steel bars is completely consistent and always maintains a uniform ring distribution, thereby realizing the adaptation to steel cages of different diameters. Attached Figure Description

[0020] Figure 1 This is a perspective view of a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0021] Figure 2 This is a perspective view of the support mechanism in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0022] Figure 3 This is a front view of the cross-limiting component, radial adaptive component, support structure, transmission component, and pre-tightening adjustment structure in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0023] Figure 4 This is a perspective view of the mounting block, limiting arm, elastic support arm, and limiting rod in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0024] Figure 5 This is a perspective view of the cross-limiting component, guide rod, and spring in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0025] Figure 6 This is a perspective view of the telescopic rod, support plate, and roller in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0026] Figure 7 This is a perspective view of the telescopic rod, support plate, roller and limiting plate in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0027] Figure 8This is a perspective view of the telescopic rod, mounting plate, transmission assembly, pre-tightening adjustment structure, and rotary drive structure in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0028] Figure 9 This is a perspective view of the mounting plate, connecting rod, and connecting block in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0029] Figure 10 This is a perspective view of the butt joint block, threaded rod, connecting block, and rotating handle in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0030] Figure 11 This is a perspective view of the mounting plate, connecting block, external gear ring, gear, and rotary actuator in a welding device for preventing deformation of steel cages used in bridge construction, as described in this invention application.

[0031] The diagram is labeled as follows: 1. Bidirectional slide; 2. Turntable; 21. Placement slot; 3. Rotary drive assembly; 4. Radial limiting structure; 41. Cross limiting assembly; 411. Mounting block; 412. Limiting arm; 413. Elastic support arm; 414. Limiting rod; 42. Radial adaptive assembly; 421. Guide rod; 422. Spring; 5. Support structure; 51. Telescopic rod; 52. Support plate; 53. Roller; 54. Limiting plate; 541. Limiting groove; 6. Diameter adjustment mechanism; 61. Mounting plate; 611. Slide; 62. Transmission assembly; 621. Connecting rod; 622. Connecting block; 6221. Inclined groove; 63. Preload adjustment structure; 631. Lead screw; 632. Connecting block; 633. Rotating handle; 64. Rotary drive structure; 641. External gear ring; 642. Gear; 643. Rotary actuator. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by this invention application, the invention application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 11The image shows a welding device for preventing deformation of steel reinforcement cages used in bridge construction. It includes a bidirectional slide 1 and two support mechanisms positioned between two welding robots. The bidirectional slide 1 is used to adjust the distance between the two support mechanisms. The support mechanism comprises a turntable 2, multiple radial limiting structures 4, multiple support structures 5, and a diameter adjustment mechanism 6. The turntable 2 has multiple placement slots 21, and a rotary drive assembly 3 is provided on one side of the turntable 2 to drive it to rotate around its own axis. The multiple radial limiting structures 4 are disposed on the turntable 2 and correspond to the multiple placement slots 21 respectively. The radial limiting structures 4 are used to restrict the movement of the steel reinforcement along the diameter direction of the turntable 2. The support structure 5 corresponds to one of the radial limiting structures 4, and the support structure 5 is located at one end of the radial limiting structure 4 near the center of the turntable 2; the diameter adjustment mechanism 6 includes a mounting plate 61, multiple transmission components 62, multiple pre-tightening adjustment structures 63, and a rotary drive structure 64. The mounting plate 61 is coaxial with and parallel to the turntable 2. Multiple sliding grooves 611 are provided on the mounting plate 61. The multiple transmission components 62 are respectively located in the multiple sliding grooves 611. The pre-tightening adjustment structure 63 is used to drive the radial limiting structure 4 and the support structure 5 to pre-clamp the reinforcing bars. The rotary drive structure 64 is used to drive the mounting plate 61 to rotate and adjust the diameter of the cylinder formed by the multiple reinforcing bars.

[0034] After the device is started, the bidirectional slide 1 adjusts the distance between the two support mechanisms according to the preset length of the straight steel bars required for the steel cage to be processed, ensuring that the distance matches the length of the steel bars. At the same time, the two support mechanisms start working synchronously. The rotary drive component 3 in the support mechanism drives the turntable 2 to rotate around its own axis, rotating one of the placement slots 21 on the turntable 2 to a vertically upward position. The operator places both ends of a straight steel bar into the corresponding placement slots 21 of the two turntables 2. Under the action of its own gravity, the steel bar moves vertically downward along the placement slot 21. After its end passes through the corresponding radial limiting structure 4, it forms a stable contact with the support structure 5. The position of the steel bar is finely adjusted to determine the reasonable distance between the end of the steel bar and the turntable 2. Next, the pre-tightening adjustment structure 63 corresponding to the support structure 5 is activated. The pre-tightening adjustment structure 63 drives the support structure 5 to move upward through the transmission component 62 in the slide groove 611 of the mounting plate 61. The support structure 5 simultaneously pushes the straight bar upward. Since the appropriate heights for bars of different diameters are different, the distance the bar moves upward will vary with its diameter until the top of the bar abuts against the radial limiting structure 4. At this time, the bar is bidirectionally clamped by the radial limiting structure 4 and the support structure 5, achieving initial fixation of a single bar and effectively preventing displacement of the bar during the subsequent rotation of the turntable 2. After the placement and pre-clamping of a single bar are completed, the rotation drive component 3 drives the turntable 2 to rotate again, rotating the next placement slot 21 to a vertically upward position, repeating the above-mentioned bar placement, initial positioning, and pre-clamping fixation operation process. During this cycle, the bar that has been placed and fixed remains stable because both ends are firmly clamped by the radial limiting structure 4 and the support structure 5 of the support mechanism. After all the reinforcing bars in the placement slots 21 have been placed and pre-clamped, the diameter adjustment mechanism 6 begins to operate. The rotary drive structure 64 in the diameter adjustment mechanism 6 drives the mounting plate 61 to rotate. During rotation, the mounting plate 61, through the transmission component 62 within the slide groove 611, synchronously drives the supporting structures 5 and the radial limiting structure 4, thereby adjusting the diameter of the cylinder formed by all the reinforcing bars to meet the design requirements for the reinforcing cage diameter. After the reinforcing cage diameter is adjusted to the correct position, the operator winds a single reinforcing bar into a ring and places it around the already arranged reinforcing bars, forming a combination structure of ring reinforcement and longitudinal reinforcement. Subsequently, two welding robots start simultaneously to weld the connection between the ring reinforcement and the straight reinforcing bars until the entire reinforcing cage is welded. By adopting a work mode of placing reinforcing bars one by one and pre-clamping them immediately, the problem of vibration interference from subsequent placement actions caused by batch placement and uniform fixing of reinforcing bars in traditional devices is effectively solved. This eliminates the need for subsequent secondary adjustments to the reinforcing bar positions, improving construction efficiency.

[0035] Reference Figure 2 , Figure 3 and Figure 4As shown: The radial limiting structure 4 includes two cross limiting components 41 symmetrically arranged about the placement groove 21. The cross limiting component 41 includes a mounting block 411, a limiting arm 412, and an elastic support arm 413. One end of the limiting arm 412 is rotatably connected to the mounting block 411. The elastic support arm 413 is used to provide a thrust to the limiting arm 412 toward the placement groove 21.

[0036] In the initial state, the two limiting arms 412 in the two intersecting limiting components 41 are in a cross-shaped state under the thrust of their respective elastic support arms 413, blocking the path of the reinforcing bar moving downward along the placement groove 21. When the worker places the end of the straight reinforcing bar into the placement groove 21, the reinforcing bar moves vertically downward along the placement groove 21 under its own weight. As the reinforcing bar moves downward, its end contacts the two intersecting limiting arms 412. At this time, the weight of the reinforcing bar is converted into a lateral thrust that pushes the two limiting arms 412 apart through the contact point. When this lateral thrust is greater than the thrust exerted by the elastic support arm 413 on the limiting arm 412, the limiting arm 412 rotates around the rotational connection point with the mounting block 411, and the two limiting arms 412 gradually move away from each other. The originally blocked placement groove 21 forms a through channel, allowing the reinforcing bar to continue sliding down. When the end of the reinforcing bar abuts against the supporting structure 5 below, the thrust of the elastic support arm 413 drives the two limiting arms 412 to return to their initial cross-shaped state, re-isolating the placement slot 21. Next, the pre-tightening adjustment structure 63 is activated, driving the supporting structure 5 upwards via the transmission assembly 62. The supporting structure 5 simultaneously pushes the reinforcing bar upwards. Under the thrust of the elastic support arm 413, the limiting space formed by the cross-shaped limiting arms 412 adaptively matches the diameter of the reinforcing bar. When the upper end of the reinforcing bar abuts against the lower ends of the two limiting arms 412, the limiting arms 412, under the action of the elastic support arm 413, exert lateral pressure on the reinforcing bar. Simultaneously, the supporting structure 5 continuously provides an upward thrust. The two work together to prevent the reinforcing bar from moving further upwards, thereby achieving pre-clamping and fixing of reinforcing bars of different diameters.

[0037] Reference Figure 3 and Figure 5 As shown: The radial limiting structure 4 also includes two radial adaptive components 42, which are respectively connected to two mounting blocks 411. Each radial adaptive component 42 includes a guide rod 421 and a spring 422. The guide rod 421 is arranged parallel to the placement groove 21, and the mounting block 411 is slidably disposed on the guide rod 421. The spring 422 is used to provide a thrust to the mounting block 411 toward the center of the turntable 2.

[0038] In the initial state, the thrust applied by spring 422 to mounting block 411 positions mounting block 411 at the end of guide rod 421 facing the center of turntable 2, so that radial limiting structure 4 and support structure 5 together form an initial layout adapted to the minimum diameter steel cage. When all the straight steel bars to be welded have been pre-clamped and fixed to support structure 5 by the cross limiting components 41 of radial limiting structure 4, the steel bars are evenly distributed in a ring on turntable 2, and the position of each steel bar is initially locked. According to the design diameter specification of the target steel cage, the operator starts the rotary drive structure 64. The rotary drive structure 64 drives mounting plate 61 to rotate at a constant speed around its own axis. Mounting plate 61 synchronously pushes each support structure 5 along the diameter direction of turntable 2 away from the center of turntable 2 through multiple transmission components 62 mounted on it. The support structure 5 exerts an outward thrust on the reinforcing bars, which is transmitted to the two limiting arms 412 and then to the mounting block 411 connected to the limiting arms 412. When this thrust is greater than the thrust exerted by the spring 422 on the mounting block 411 towards the center, the mounting block 411 overcomes the elastic force of the spring 422 and slides smoothly along the guide rod 421 in a direction away from the center of the turntable 2. Since the support structure 5 corresponding to all reinforcing bars is synchronously linked with the radial adaptive component 42, the sliding distance of each mounting block 411 remains consistent, ensuring that all reinforcing bars are always evenly distributed in a ring. As the mounting plate 61 continues to rotate, the diameter of the ring formed by the reinforcing bars gradually increases until it reaches the design diameter of the target reinforcing cage. The rotation drive structure 64 stops working, the elastic force of the spring 422 balances the thrust transmitted by the reinforcing bars, and the mounting block 411 stably stops at the corresponding position of the guide rod 421. The radial position of the reinforcing bars is locked, thereby achieving adaptation to reinforcing cages of different diameters.

[0039] Reference Figure 3 and Figure 4 As shown: The cross-limiting assembly 41 further includes a limiting rod 414, which is mounted on the limiting arm 412. The limiting rod 414 is used to prevent the elastic support arm 413 from pushing the limiting arm 412 to rotate.

[0040] The two limiting arms 412 gradually rotate around their respective rotational connection points with the mounting block 411, maintaining a tendency to move towards the placement groove 21 throughout the rotation. When the two limiting arms 412 rotate to a preset angle, the limiting rod 414 on one limiting arm 412 contacts the corresponding position of the other limiting arm 412, generating a reverse supporting force. This supporting force balances the thrust of the elastic support arm 413, preventing the limiting arm 412 from continuing to rotate towards the placement groove 21. The two limiting arms 412 remain stably in their current positions, no longer rotating relative to each other. At this time, the two limiting arms 412 maintain a preset crossed state, which effectively blocks the downward path of the reinforcing bar and reserves reasonable force space for the subsequent separation action when the reinforcing bar is introduced. When the reinforcing bar is placed in the placement slot 21 and pushed apart by gravity, the limiting arm 412, the limiting rod 414 rotates synchronously with the limiting arm 412. After the reinforcing bar is in place, the elastic support arm 413 drives the limiting arm 412 to reset until the limiting rod 414 contacts the other limiting arm 412 again. The limiting arm 412 then returns to its initial limiting state, continuously providing stable lateral constraint for the pre-clamping of the reinforcing bar. By setting the limiting rod 414 on the limiting arm 412, the rotation angle of the two limiting arms 412 is limited, effectively avoiding the problem of excessive rotation of the limiting arm 412 caused by excessive thrust of the elastic support arm 413.

[0041] Reference Figure 2 , Figure 3 and Figure 6 As shown: The support structure 5 includes a telescopic rod 51, a support plate 52, and a plurality of rollers 53; the telescopic rod 51 is slidably connected to the turntable 2, and the axis of the telescopic rod 51 passes through the center of the turntable 2; the support plate 52 is connected to the telescopic rod 51; the plurality of rollers 53 are equally spaced on the support plate 52.

[0042] Under the influence of gravity, the reinforcing bars push the two limiting arms 412 of the cross-limiting assembly 41 apart, and then slide down the placement groove 21 until they land smoothly on the multiple rollers 53 of the support plate 52. The rolling characteristics of the rollers 53 significantly reduce the frictional resistance between the reinforcing bars and the support structure 5, allowing the reinforcing bars to move freely along their own axial direction. Next, the operator pushes or pulls the reinforcing bars along the axial direction according to the design length requirements of the reinforcing cage to adjust the position of the reinforcing bars on the rollers 53. Due to the extremely low rolling frictional resistance of the rollers 53, the adjustment process is smooth and effortless until the distance between the two ends of the reinforcing bars and the corresponding turntables 2 reaches the preset standard, completing the calibration of the axial position of the reinforcing bars. After the axial position is adjusted to the correct position, the pre-tightening adjustment structure 63 is activated, transmitting power to the telescopic rod 51 through the transmission assembly 62, driving the telescopic rod 51 to move upward along its own axis. The telescopic rod 51 drives the support plate 52 and its multiple rollers 53 to rise synchronously. The rollers 53 push the reinforcing bar upward until the top of the reinforcing bar abuts against the limiting arm 412 of the radial limiting structure 4. Under the combined action of the upward pushing force of the support structure 5 and the lateral restraint force of the radial limiting structure 4, the reinforcing bar is pre-clamped and fixed. By using multiple equally spaced rollers 53, the sliding friction between the reinforcing bar and the support structure 5 is converted into rolling friction, which greatly reduces the adjustment resistance and allows the operator to easily move the reinforcing bar axially, thereby quickly calibrating the distance between the end of the reinforcing bar and the turntable 2 to the preset value.

[0043] Reference Figure 3 and Figure 7 As shown: The support structure 5 also includes two limiting plates 54, which are respectively disposed on both sides of the support plate 52. The limiting plates 54 have limiting grooves 541. The support plate 52 cooperates with the limiting grooves 541 to prevent the support plate 52 from rotating around the axis of the telescopic rod 51.

[0044] In the initial state, the telescopic rod 51 is in a retracted state, and the support plate 52 is stably positioned below the limiting groove 541 under the constraint of the limiting groove 541. The rollers 53 remain horizontal. After the reinforcing bar passes through the cross limiting component 41, it falls smoothly onto the multiple rollers 53 of the support plate 52. When the operator adjusts the position of the reinforcing bar along its axial direction, the rollers 53 rotate with the movement of the reinforcing bar. The support plate 52 remains in a fixed posture under the guidance of the limiting groove 541 and does not rotate around the axis of the telescopic rod 51, ensuring that the reinforcing bar is always on the preset support trajectory during the adjustment process. After the pre-tightening adjustment structure 63 is activated, it drives the telescopic rod 51 to move upward along its own axis through the transmission component 62. The telescopic rod 51 drives the support plate 52 to rise synchronously. During this process, the two sides of the support plate 52 are always in contact with the limiting groove 541 of the limiting plate 54. The limiting groove 541 forms a circumferential constraint on the support plate 52, preventing the support plate 52 from rotating during the rise, ensuring that the multiple rollers 53 always maintain an orientation that matches the axial direction of the reinforcing bar. By setting limiting plates 54 with limiting grooves 541 on both sides of the support plate 52, the circumferential rotation of the support plate 52 is constrained.

[0045] Reference Figure 2 , Figure 8 and Figure 9 As shown: The transmission assembly 62 includes a connecting rod 621 and a connecting block 622; one end of the connecting rod 621 is connected to the support structure 5; the connecting block 622 is slidably disposed in the sliding groove 611, and the connecting block 622 is provided with an inclined groove 6221, and the connecting rod 621 is slidably disposed in the inclined groove 6221 and in contact with the bottom of the inclined groove 6221.

[0046] Initially, the connecting block 622 contacts the bottom of the slide groove 611, and the connecting rod 621 contacts the bottom of the inclined groove 6221. After the reinforcing bar falls onto the multiple rollers 53 of the support plate 52 and completes axial position adjustment, the pre-tightening adjustment structure 63 is activated. The pre-tightening adjustment structure 63 applies an upward thrust to the connecting block 622, driving the connecting block 622 to slide along the slide groove 611 of the mounting plate 61 in a direction away from the center of the mounting plate 61. During the movement of the connecting block 622, the bottom of its inclined groove 6221 pushes the connecting rod 621 to move vertically upward. The connecting rod 621 simultaneously drives the telescopic rod 51 to move upward along its own axis, ultimately pushing the reinforcing bar to abut against the radial limiting structure 4, achieving pre-clamping of the reinforcing bar. Subsequently, the connecting block 622 stops moving and maintains its current position. After all reinforcing bars have been pre-clamped, according to the target reinforcing cage diameter requirement, the rotation drive structure 64 is activated and drives the mounting plate 61 to rotate around its own axis. When the mounting plate 61 rotates, it drives all the connecting blocks 622 in the grooves 611 to move synchronously around the axis of the mounting plate 61. During the rotation of the connecting blocks 622, the groove wall of the inclined groove 6221 generates a radial thrust on the connecting rod 621, pushing the connecting rod 621 to move away from the center of the mounting plate 61. The connecting rod 621 drives the telescopic rod 51 to move synchronously outward along the radial direction of the turntable 2, thereby causing the reinforcing bars to gradually move away from the center of the turntable 2. Since all the connecting blocks 622 rotate synchronously with the mounting plate 61, the thrust on each connecting rod 621 is the same and the moving distance is the same, so that all the reinforcing bars expand outward synchronously along the radial direction, thereby achieving a uniform ring distribution of all the reinforcing bars.

[0047] Reference Figure 8 and Figure 10 As shown: The preload adjustment structure 63 includes a lead screw 631, a connecting block 632, and a rotating handle 633; ​​the lead screw 631 is arranged parallel to one side of the slide groove 611; the connecting block 632 is threadedly connected to the lead screw 631, and the connecting block 632 is connected to the transmission assembly 62; the rotating handle 633 is connected to the lead screw 631.

[0048] In the initial state, the connecting block 632 and the docking block 622 are positioned together at the end of the lead screw 631 near the center of the mounting plate 61. At this time, the distance between the bottom of the inclined groove 6221 on the docking block 622 and the center of the mounting plate 61 is the shortest, and the docking rod 621 of the transmission assembly 62 is in close contact with the bottom of the inclined groove 6221. After the reinforcing bar is placed on the support structure 5, the operator rotates the rotating handle 633, which drives the lead screw 631 to rotate around its own axis. The rotational motion of the lead screw 631 is converted into the linear motion of the connecting block 632 along the lead screw 631. The connecting block 632 drives the docking block 622 to move synchronously along the sliding groove 611 of the mounting plate 61 in a direction away from the center of the mounting plate 61. During the movement of the docking block 622, the bottom of its inclined groove 6221 pushes the docking rod 621 upward. The docking rod 621 drives the telescopic rod 51 of the support structure 5 to rise synchronously, thereby pushing the reinforcing bar upward until the reinforcing bar is in close contact with the radial limiting structure 4, completing the pre-clamping. Next, the operator stops rotating the handle 633, and the lead screw 631 stops rotating accordingly. Because the threaded connection between the lead screw 631 and the connecting block 632 has a self-locking characteristic, the position of the connecting block 632 on the lead screw 631 remains fixed, and the connecting block 622 also maintains its current stable position. This ensures that the distance between the bottom of the inclined groove 6221 on the connecting block 622 and the center of the mounting plate 61 remains constant, thus maintaining the stable pre-clamping state of the reinforcing bar. Through the combined design of the lead screw 631, the connecting block 632, and the rotating handle 633, and utilizing the self-locking characteristic of the lead screw 631's thread, a stable locking of the relative position between the connecting block 622 and the mounting plate 61 after pre-clamping is achieved.

[0049] Reference Figure 8 and Figure 11 As shown: The rotary drive structure 64 includes an external gear ring 641, a gear 642, and a rotary driver 643; the external gear ring 641 is coaxially connected to the mounting plate 61; the gear 642 meshes with the external gear ring 641; the rotary driver 643 is disposed on the turntable 2, and the output end of the rotary driver 643 is connected to the gear 642.

[0050] After all the straight reinforcing bars are in place, the rotary actuator 643 is activated according to the design diameter requirements of the target reinforcing cage. The rotary actuator 643 outputs power to drive the gear 642 connected to its output end to rotate around its own axis. Since the gear 642 meshes with the external gear ring 641, the rotational motion of the gear 642 is transmitted to the external gear ring 641 through the tooth surface transmission, causing the mounting plate 61, which is coaxially connected to the external gear ring 641, to rotate uniformly around its own axis. During the rotation of the mounting plate 61, the sliding groove 611 opened on it synchronously drives all the docking blocks 622 that are slidably assembled in the sliding groove 611 to make circular motion around the axis of the mounting plate 61. During this rotation, the inclined groove 6221 opened on the docking block 622 interacts with the docking rod 621 of the transmission component 62. The groove wall of the inclined groove 6221 applies a thrust to the docking rod 621 in the direction away from the center of the mounting plate 61, pushing the docking rod 621 to move smoothly along the inclined groove 6221 away from the center of the mounting plate 61. When the connecting rod 621 moves, it synchronously drives the telescopic rod 51 connected to it to move radially away from the center of the mounting plate 61 along the turntable 2. The telescopic rod 51 further drives the steel bars supported on the support plate 52 and roller 53 to expand outward synchronously. Through the coordinated transmission design of the external gear ring 641, gear 642 and rotary drive 643, the diameter of the steel cage can be efficiently adjusted.

[0051] Referring to the figure: the placement groove 21 is opened along the diameter direction of the turntable 2 and extends to the edge of the turntable 2 to form an entrance.

[0052] When the rotary drive assembly 3 rotates one of the placement slots 21 to a preset vertically upward position, the placement slot 21 directly connects to the outside through its edge entrance, forming an unobstructed rebar inlet channel. The operator places a straight rebar horizontally on the top of the turntables 2 of the two support mechanisms, then adjusts the rebar's posture so that both ends align with the pre-positioned placement slots 21 entrances on the two turntables 2. The operator then moves the rebar vertically downwards. Because the placement slots 21 are continuous along the diameter and have unobstructed entrances, the rebar's ends, under the combined action of its own weight and downward thrust, can directly enter the corresponding placement slots 21 on the two turntables 2 without additional adjustment or guidance, thus completing the rapid placement of a single rebar and improving the convenience and efficiency of rebar placement.

[0053] The above embodiments only illustrate one or more implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A welding device for preventing deformation of steel reinforcement cages during bridge construction, characterized in that, The application relates to a welding device, which comprises a bidirectional sliding table (1) arranged between two welding manipulators and two supporting mechanisms, the bidirectional sliding table (1) is used for adjusting the distance between the two supporting mechanisms, the supporting mechanism comprises a rotating disc (2), a plurality of radial limiting structures (4), a plurality of supporting structures (5) and a diameter adjusting mechanism (6), a plurality of placing grooves (21) are formed in the rotating disc (2), one side of the rotating disc (2) is provided with a rotating driving assembly (3) used for driving the rotating disc (2) to rotate around the axis of the rotating disc (2), the radial limiting structure (4) is used for limiting the movement of steel bars in the diameter direction of the rotating disc (2), the supporting structure (5) is arranged at one end of the radial limiting structure (4) close to the center of the rotating disc (2), the diameter adjusting mechanism (6) comprises a mounting disc (61), a plurality of transmission assemblies (62), a plurality of pre-tightening adjusting structures (63) and a rotating driving structure (64), the mounting disc (61) is coaxial with and parallel to the rotating disc (2), a plurality of sliding grooves (611) are formed in the mounting disc (61), the transmission assembly (62) is arranged in the sliding groove (611), the pre-tightening adjusting structure (63) is used for driving the radial limiting structure (4) and the supporting structure (5) to pre-clamp the steel bars, the rotating driving structure (64) is used for driving the mounting disc (61) to rotate and adjust the diameter of the cylinder formed by the steel bars, the radial limiting structure (4) comprises two cross limiting assemblies (41) which are symmetrically arranged relative to the placing groove (21), the cross limiting assembly (41) comprises a mounting block (411), a limiting arm (412) and an elastic supporting arm (413), one end of the limiting arm (412) is rotationally connected with the mounting block (411), the elastic supporting arm (413) is used for providing a pushing force of the limiting arm (412) towards the placing groove (21), the radial limiting structure (4) further comprises two radial self-adapting assemblies (42), the radial self-adapting assembly (42) comprises a guide rod (421) and a spring (422), the guide rod (421) is arranged in parallel with the direction of the placing groove (21), the mounting block (411) is slidingly arranged on the guide rod (421), the spring (422) is used for providing a pushing force of the mounting block (411) towards the center of the rotating disc (2), the cross limiting assembly (41) further comprises a limiting rod (414), the limiting rod (414) is arranged on the limiting arm (412), and the limiting rod (414) is used for preventing the elastic supporting arm (413) from rotating the limiting arm (412), the supporting structure (5) comprises a telescopic rod (51), a supporting plate (52) and a plurality of rollers (53). ​ ​ ​ ​ 2. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 1, characterized in that, ​ ​ ​ 3. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 2, characterized in that, ​ ​ ​ 4. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 2, characterized in that, ​ 5. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 1, characterized in that, ​ The telescopic rod (51) is in sliding connection with the rotating disc (2), and the axis of the telescopic rod (51) passes through the center of the rotating disc (2); The support plate (52) is connected with the telescopic rod (51); A plurality of the rollers (53) are arranged on the support plate (52) in a uniform adjacent interval.

6. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 5, wherein The support structure (5) further comprises two limiting plates (54), the two limiting plates (54) are arranged on the two sides of the support plate (52) respectively, a limiting groove (541) is formed in the limiting plate (54), the support plate (52) is matched with the limiting groove (541), and rotation of the support plate (52) around the axis of the telescopic rod (51) is prevented.

7. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 1, characterized in that, The transmission assembly (62) comprises a butt joint rod (621) and a butt joint block (622); One end of the butt joint rod (621) is connected with the support structure (5); The butt joint block (622) is arranged in the sliding groove (611) in a sliding mode, the butt joint block (622) is provided with an inclined groove (6221), the butt joint rod (621) is arranged in the inclined groove (6221) in a sliding mode, and the butt joint rod (621) is in contact with the groove bottom of the inclined groove (6221).

8. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 1, characterized in that, The pre-tightening adjusting structure (63) comprises a lead screw (631), a connecting block (632) and a rotating handle (633); The lead screw (631) is arranged on one side of the sliding groove (611) in parallel; The connecting block (632) is in threaded connection with the lead screw (631), and the connecting block (632) is connected with the transmission assembly (62); The rotating handle (633) is connected with the lead screw (631).

9. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 1, characterized in that, The rotary driving structure (64) comprises an outer gear ring (641), a gear (642) and a rotary driver (643); The outer gear ring (641) is coaxially connected with the mounting disc (61); The gear (642) is in meshing connection with the outer gear ring (641); The rotary driver (643) is arranged on the rotating disc (2), and an output end of the rotary driver (643) is connected with the gear (642).

10. The welding device for preventing deformation of reinforcement cage for bridge construction according to claim 1, characterized in that, The placing groove (21) is formed along the diameter direction of the rotating disc (2) and extends to the edge of the rotating disc (2) to form an entrance.

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