Welding fixture for manufacturing building foundation column reinforcement

Abstract

The present application relates to the technical field of steel bar welding, in particular to a welding clamp for building foundation column steel bar manufacturing, which comprises butt joint units, clamping units and alignment units corresponding to screw rod groups, the butt joint units comprise two screw rod groups arranged above and below, and the lower screw rod group is provided with a clamping head, the present application realizes the integrated control of multiple functions such as accurate longitudinal rib alignment of steel bar, dynamic vertical alignment, continuous stable vertical pressure and end close fitting through the organic synergistic combination of multiple key components such as alignment units, clamping units, alignment groups, pressing down groups and adjusting groups, solves the key technical problems such as longitudinal rib misalignment, clamping deflection and poor fitting of the steel bar welding clamp in the prior art, ensures the welding quality of the steel bar, and still retains the portability and on-site construction flexibility of the welding clamp.

Description

Technical Field

[0001] This invention relates to the field of steel bar welding technology, specifically a welding fixture for fabricating steel bars for building foundation columns. Background Technology

[0002] The reinforcing cage in the foundation column structure of a building is usually made by binding or welding longitudinal main bars and stirrups. The longitudinal main bars are the core load-bearing components that bear the load transfer, and their connection quality directly affects the overall stability of the building. The longitudinal main bars are usually ribbed steel bars with two symmetrical raised longitudinal ribs and several transverse ribs on their surface. In the fabrication of building foundation columns, electroslag pressure welding is usually used to butt weld the longitudinal main bars on site to form the required length of longitudinal main bars. This process melts the end face of the steel bar with electric current and forms a weld under axial pressure, which has the advantages of high strength and low cost.

[0003] To accommodate the flexibility of on-site construction, portable welding equipment is commonly used. The core components of this equipment include a portable welding power source and specialized clamps. The clamps primarily consist of movable and fixed clamping arms arranged vertically, and V-shaped clamping plates corresponding to the two clamping arms. When fixing reinforcing bars, the first reinforcing bar, pre-embedded or already fixed in the foundation cap, is used as a base. This reinforcing bar is placed within the fixed clamping arm and corresponding V-shaped clamping plate, with the clamping head of the fixed clamping arm and the corresponding V-shaped clamping plate engaging to hold and fix the reinforcing bar. Then, the reinforcing bar to be welded is placed within the movable clamping arm and corresponding V-shaped clamping plate. The operator aligns the end of the reinforcing bar to be welded with the end of the reinforcing bar below it, and then drives the clamping head of the movable clamping arm and the corresponding V-shaped clamping plate to hold and fix the reinforcing bar to be welded. Welding then begins. During welding, the movable clamping arm and V-shaped clamping plate are controlled to press the reinforcing bar to be welded downwards, forming a dense and strong weld joint between the two sections of reinforcing bar. This process is repeated to weld subsequent reinforcing bars upwards in sequence.

[0004] As can be seen from the above, the welding fixture is used to clamp the free end of the steel bar that is fixed at one end. However, the following problems exist during this clamping operation: 1. The existing fixture cannot accurately align the longitudinal ribs of the two steel bars. Relying solely on the operator to manually adjust the position of the longitudinal ribs, misalignment is likely to occur between the longitudinal ribs of the two steel bars, which reduces the effective cross-sectional area at the weld joint, thereby reducing the weld quality of the steel bar. Furthermore, the longitudinal rib position cannot be continuously constrained during welding. 2. Because the clamping position of the steel bar to be welded is usually close to its welding end, the overhang length of the steel bar to be welded is relatively long, causing the center of gravity of the steel bar to be welded to deviate and tend to be cantilevered. Especially when the length-to-diameter ratio (the ratio of length to diameter) of the steel bar to be welded is large, the clamping position of the steel bar to be welded will generate a large overturning moment, reducing clamping stability and making it more prone to axial tilting. The welding end faces of the two steel bars cannot be effectively and evenly fitted, resulting in a reduction in the welding quality of the steel bars. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a welding clamp for fabricating reinforcing bars of building foundation columns, comprising a docking unit, the docking unit comprising two screw groups arranged vertically, with a clamping head provided on the lower screw group; the welding clamp for fabricating reinforcing bars of building foundation columns further comprising: a clamping unit, comprising an arc-shaped plate connected to the upper screw group via an elastic telescopic rod, a transmission plate slidably sleeved on the outer side of the fixed section of the elastic telescopic rod, a alignment group provided on the right side of the transmission plate, and a pressing group connected between the arc-shaped plate and the transmission plate; and an alignment unit corresponding one-to-one with the screw groups, comprising a clamping plate provided on the docking unit, with a V-shaped clamping groove opened in the middle of the left end of the clamping plate. Both inner walls of the clamping groove are equipped with linear arrays of alignment plates. Multiple alignment plates and clamping plates are connected by an adjustment group for adjusting the left and right positions of the alignment plates. The alignment group includes inclined plates and alignment rollers arranged symmetrically. The inclined plates are hinged by a torsion spring shaft and generate bidirectional pressure. Taking the lower reinforcing bar in a fixed state as a reference, the upper reinforcing bar is clamped by the arc plate and the clamping groove. At the same time, the alignment plate abuts against the right end of the longitudinal rib of the corresponding reinforcing bar, automatically aligning the longitudinal ribs of the two reinforcing bars vertically. Then, the transmission plate moves to the right to control the alignment roller to press the upper reinforcing bar to make it vertically centered. At the same time, the transmission plate drives the lower pressing group to press down the transverse rib of the upper reinforcing bar, so that the ends of the two reinforcing bars fit tightly and evenly.

[0006] Preferably, the clamping plate has square holes that correspond one-to-one with the alignment plate. The adjustment group includes sliding rods that are slidably installed in the square holes. The alignment plate is slidably installed on the side of the sliding rods near the middle of the clamping plate by means of a top extension spring. A synchronizing rod is fixedly installed on the side of the sliding rods that are arranged vertically away from the middle of the clamping plate. A U-shaped adjustment plate is fixedly installed on the right end of the two synchronizing rods corresponding to the same clamping plate.

[0007] Preferably, the adjusting plate and multiple limiting rods fixedly installed on the right end of the clamping plate are slidably connected left and right, and the adjusting plate is threadedly connected with an adjusting screw, and the left end of the adjusting screw is rotatably installed in the middle of the right end of the clamping plate.

[0008] Preferably, the inclined plate is hinged to the right end of the transmission plate by a torsion spring shaft, the right ends of the two inclined plates are arranged in an inclined direction away from each other, the arc plate is located between the two inclined plates, and the positioning roller is rotatably installed on the right end of the inclined plate.

[0009] Preferably, an installation groove is provided in the middle of the right arc surface of the arc plate, and the pressing group includes a sliding plate that is slidably installed in the installation groove, and multiple pressing blocks that are evenly arranged vertically are fixedly installed on the right side of the sliding plate.

[0010] Preferably, a plurality of guide rods are evenly arranged front and back on the sliding plate and slide up and down, and the guide rods are slidably installed in the mounting groove. There is a return spring between the lower end of the sliding plate and the circular plate fixedly sleeved on the outer side of the lower end of the guide rod.

[0011] Preferably, guide blocks are fixedly installed at both ends of the sliding plate, and guide grooves are opened on the inner walls of the front and rear of the mounting groove. The upper end of the guide groove is arranged to be inclined to the left and the lower end is arranged vertically. The guide blocks are slidably installed in the corresponding guide grooves.

[0012] Preferably, two L-shaped pressure rods symmetrically arranged front and back are fixedly installed on the left end of the sliding plate. The horizontal section of the L-shaped pressure rod slides through the arc surface on the left side of the arc plate. A pressure plate corresponding to the L-shaped pressure rod is installed through and slides left and right on the transmission plate. A square plate is fixedly installed on the left end of the pressure plate, and a pressure spring is connected between the square plate and the left end of the transmission plate. The lower right side of the pressure plate is set as an inclined surface that cooperates with the vertical section of the corresponding L-shaped pressure rod.

[0013] Preferably, the fixed section of the elastic telescopic rod is equipped with two locking groups arranged on the left and right. Each locking group includes multiple circumferentially evenly arranged elastic locking rods that are slidably installed on the outside of the fixed section of the elastic telescopic rod. Locking holes are provided on the outside of the telescopic section of the elastic telescopic rod at the positions corresponding to the elastic locking rods.

[0014] Preferably, both ends of the transmission plate are equipped with mating blocks corresponding to the elastic locking rods, and the end of the mating block away from the transmission plate is set as an inclined surface that mates with the corresponding elastic locking rod.

[0015] The beneficial effects of this invention are as follows: 1. Based on the requirement of vertically lapping the steel bars to be welded to the upper end of the fixed steel bars, when the two steel bars are clamped and fixed in the clamping groove of the corresponding clamping plate, the positioning plate abuts against the right end of the longitudinal rib of the steel bar, automatically realizing the positioning of the longitudinal ribs of the upper and lower steel bars, so that the longitudinal ribs of the upper and lower steel bars are vertically aligned, preventing the problem of reduced effective cross-sectional area at the weld joint due to misalignment of the longitudinal ribs of the two steel bars, ensuring the welding quality of the steel bars, and thus ensuring the overall strength of the welded steel bars.

[0016] 2. This invention uses a positioning group to vertically position the upper reinforcing bar by applying symmetrical pressure from above and below, preventing slight tilting of the upper reinforcing bar. Simultaneously, the pressure points are evenly distributed on the upper and lower sides of the clamping position, with the uppermost pressure point far from the welded end of the upper reinforcing bar. By balancing the force on the upper reinforcing bar, the overturning moment generated by external forces on the clamping position of the upper reinforcing bar is reduced, effectively preventing cantilever tilting. This ensures that even reinforcing bars with a large length-to-diameter ratio remain in a vertical and stable clamping state, ensuring a tight and uniform fit between the ends of the two reinforcing bars, thereby further improving the welding quality of the reinforcing bars.

[0017] 3. This invention achieves linkage fixation through the symmetrical pressing of the alignment group and the pressing of the downward pressing group, enhancing the clamping stability of the reinforcing bars. This ensures that the ends of the two reinforcing bars are stably aligned and tightly fitted. Combined with the longitudinal rib alignment and positioning achieved by the V-shaped clamping groove and the alignment plate during clamping and fixing, and the adjustment of the alignment plate position achieved by the adjustment group, a highly integrated, automated welding clamping system suitable for straight reinforcing bars of various diameters is formed, while retaining the system's portability and flexible construction on site. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention from a first perspective.

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention from a second perspective.

[0021] Figure 3 This is a cross-sectional view of the clamping plate, limiting rod, adjusting screw, adjusting plate and sliding rod of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the pressing group, the positioning group, and the arc plate of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the guide block, sliding plate, guide groove, and L-shaped pressure rod of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the transmission plate, lower pressure plate, square plate, pressure spring, and mating block of the present invention.

[0025] Figure 7 This is a cross-sectional view of the transmission plate, mating block, and elastic locking rod of the present invention.

[0026] Figure 8 This is a top-down view of the structure of the arc-shaped plate and the corresponding clamping plate of the present invention clamping the upper reinforcing bar.

[0027] Figure 9 This is a schematic diagram of a three-dimensional structure of ribbed steel bars.

[0028] Reference numerals: 1. Docking unit; 11. Screw assembly; 111. Fixing sleeve; 112. Threaded rod one; 12. Clamping head; 13. Reference plate; 14. Round rod; 15. Pressurizing assembly; 151. Transmission component; 152. Control handle; 153. Lifting handle; 154. Threaded rod two; 16. Movable plate; 2. Clamping unit; 21. Elastic telescopic rod; 22. Arc plate; 221. Guide groove; 23. Electric slider assembly; 24. Transmission plate; 241. Lower pressure plate; 242. Square plate; 243. Pressurizing spring 244. Spring; 25. Mating block; 26. Alignment group; 27. Inclined plate; 28. Alignment roller; 29. ​​Pressing group; 20. Sliding plate; 21. Pressing block; 22. Guide rod; 23. Return spring; 244. Guide block; 255. L-shaped pressing rod; 266. Elastic locking rod; 27. Alignment unit; 28. Clamping plate; 29. ​​Alignment plate; 20. Adjustment group; 20. Sliding rod; 21. Top extension spring; 22. Synchronizing rod; 23. Adjusting plate; 244. Limiting rod; 25. Adjusting screw. Detailed Implementation

[0029] The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where no specific technology or conditions are specified in the embodiments, they shall be performed in accordance with the technology or conditions described in the literature in the field or in accordance with the product manual.

[0030] See Figure 1 , Figure 2 and Figure 9 A welding clamp for fabricating steel reinforcement in building foundation columns includes a docking unit 1. The docking unit 1 includes two screw groups 11 arranged vertically. A clamping head 12 is provided on the lower screw group 11, and a clamping unit 2 is provided on the upper screw group 11. The docking unit 1 is provided with an alignment unit 3 that corresponds one-to-one with the screw group 11.

[0031] It should be noted that the docking unit 1 adopts existing technology as a whole; the docking unit 1 also includes a reference plate 13, and a pressure assembly 15 is provided on the upper end of the reference plate 13 through two round rods 14 arranged left and right. A movable plate 16 is slidably installed on the two round rods 14, and the movable plate 16 is located between the pressure assembly 15 and the reference plate 13; the screw assembly 11 includes a fixed sleeve 111 and a threaded rod 112. The upper and lower fixed sleeves 111 are respectively fixedly installed on the reference plate 13 and the movable plate 16. The threaded rod 112 is connected to the fixed sleeve 111 through a threaded fit (not shown in the figure). The clamping head 12 is fixedly installed on the right end of the lower threaded rod 112. The clamping unit 2 is connected to the upper threaded rod 112. Two alignment units 3 are respectively set on the reference plate 13 and the movable plate 16.

[0032] It should be noted that the pressurization unit 15 includes a transmission component 151 disposed on the upper end of two round rods 14. A control handle 152 is disposed on the transmission component 151, and a lifting handle 153 is also rotatably mounted on the transmission component 151. The transmission component 151 is threadedly connected to the movable plate 16 via a threaded rod 154. The threaded rod 154 is threadedly connected to the movable plate 16 and rotatably connected to the transmission component 151. When the operator rotates the control handle 152, the control handle 152 drives the threaded rod 154 to rotate through the transmission component 151, thereby causing the threaded rod 154 to move the movable plate 16 up and down.

[0033] This invention is based on a construction scenario where steel bars are vertically lapped layer by layer onto a fixed vertical steel bar and welded on-site. It boasts high portability and operational flexibility, allowing for rapid relocation to the next welding position and adaptability to different steel bar diameters and welding heights. It requires no large mechanical structures or equipment support and does not rely on a fixed welding platform, allowing for flexible work locations. This invention clamps and fixes two vertically arranged steel bar sections while simultaneously positioning their longitudinal ribs to ensure vertical alignment. This prevents misalignment during welding, which could reduce the effective cross-sectional area at the joint, ensuring weld quality and overall strength of the welded steel bar. Furthermore, this invention can align the upper steel bar to ensure vertical placement and ensure a tight and uniform fit between the welding ends of the upper and lower steel bars during welding, further guaranteeing weld quality. This invention optimizes the structure and function based on the three-dimensional structural features of the steel bar, rather than focusing on planar welding.

[0034] Specifically, starting with the first reinforcing bar (lower reinforcing bar) pre-embedded or fixed in the foundation pier (or lower structure), the operator moves the lower alignment unit 3 to the position corresponding to the lower reinforcing bar to be welded by pulling the handle 153, and places the lower reinforcing bar in the lower alignment unit 3. Then, the operator manually screws the lower threaded rod 112 to drive the clamping head 12 and the lower alignment unit 3 to clamp and fix the lower reinforcing bar. Next, the operator places the upper reinforcing bar in the upper alignment unit 3. Finally, the operator manually screws the upper threaded rod 112 to drive the clamping unit 2 and the alignment unit 3 to clamp and fix the upper reinforcing bar. The alignment unit 3 positions the longitudinal ribs of the corresponding reinforcing bar so that the longitudinal ribs of the upper and lower reinforcing bars are aligned vertically.

[0035] The clamping unit 2 is used to vertically align the reinforcing bars, ensuring that the reinforcing bars are vertically aligned axially. Simultaneously, the clamping unit 2 can also cause the lower end of the upper reinforcing bar to elastically press against the upper end of the lower reinforcing bar, ensuring a tight and uniform weld between the two sections. Then, the operator installs a flux box (not shown in the figure) at the weld joint of the two sections and adds flux. Next, the pressure group 15 is controlled to slightly move the movable plate 16 upwards, creating a small gap between the ends of the two sections of reinforcing bars. Then, electricity is applied to the two sections of reinforcing bars, generating an electric arc through the gap at the ends. The heat from the electric arc melts the flux, forming high-temperature slag. As heating continues, the ends of the reinforcing bars gradually melt. The pressure group 15 is then controlled to move the movable plate 16 downwards, ultimately causing the clamped upper reinforcing bar to rigidly press downwards against the upper end of the lower reinforcing bar, extruding the molten metal and slag, tightly bonding the two ends of the reinforcing bars to form a weld joint. This completes the welding of the two sections of reinforcing bars. After the rebar welding is completed, remove the welding box, manually screw the lower threaded rod 112 so that the corresponding clamping head 12 no longer cooperates with the lower alignment unit 3 to clamp the lower rebar, and manually screw the upper threaded rod 112 so that the corresponding clamping unit 2 no longer cooperates with the alignment unit 3 to clamp the upper rebar. Then move the welding equipment to the next welding position, and use the welded rebar section above as the new "lower rebar", that is, the fixed foundation. Then repeat the above process to weld the subsequent rebars upward in sequence.

[0036] See Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 8 The clamping unit 2 includes an arc-shaped plate 22 mounted on the right end of the upper threaded rod 112 via an elastic telescopic rod 21. The left end of the elastic telescopic rod 21 is rotatably connected to the right end of the upper threaded rod 112, and a symmetrical guide rod that is slidably connected to the fixed sleeve 111 is installed on the left end of the elastic telescopic rod 21. A transmission plate 24 is slidably mounted on the outside of the fixed section of the elastic telescopic rod 21 via an electric slider assembly 23. The transmission plate 24 is located on the left side of the arc-shaped plate 22, and a positioning group 25 is provided on the right end of the transmission plate 24. A pressing group 26 is connected between the arc-shaped plate 22 and the transmission plate 24. Two locking groups arranged on the left and right are installed on the fixed section of the elastic telescopic rod 21.

[0037] See Figure 1 , Figure 2 and Figure 3 The alignment unit 3 includes a clamping plate 31. Multiple connecting rods are connected between the upper clamping plate 31 and the movable plate 16, and between the lower clamping plate 31 and the reference plate 13. A V-shaped clamping groove is provided in the middle of the left end of the clamping plate 31. Multiple alignment plates 32 are provided on the two inner side walls of the clamping groove. An adjustment group 33 for adjusting the left and right positions of the alignment plates 32 is installed between the multiple alignment plates 32 and the clamping plate 31.

[0038] See Figures 1 to 9 The alignment unit 3 is used to cooperate with the clamping head 12 to clamp and fix the corresponding steel bars. The clamping unit 2 is used to ensure that the upper steel bar is arranged vertically and that the lower end of the upper steel bar is elastically pressed against the upper end of the lower steel bar. Specifically, the left and right positions of the multiple alignment plates 32 are first adjusted according to the diameter of the steel bar by the control adjustment group 33. When the lower steel bar is located in the clamping groove of the lower clamping plate 31, the operator moves the position of the clamping plate 31 by pulling the handle 153, so that the lower steel bar is placed in the clamping groove of the clamping plate 31 in the center, and the longitudinal rib of the lower steel bar is aligned with the corresponding multiple alignment plates 32 arranged above and below. Then, the lower threaded rod 112 is manually turned to drive the clamping head 12 and the clamping groove of the lower clamping plate 31 to clamp and fix the lower steel bar. The alignment plate 32 corresponding to the lower clamping plate 31 abuts against the right end of the longitudinal rib of the lower steel bar, thereby clamping and fixing the lower steel bar while positioning its longitudinal rib.

[0039] When the upper reinforcing bar is placed in the clamping groove of the upper clamping plate 31, manually rotate the upper reinforcing bar to align its longitudinal ribs with the corresponding upper and lower aligning plates 32. Then manually screw on the upper threaded rod 112. Under the limiting and guiding action of the guide rod, the elastic telescopic rod 21 moves only in a straight line under the drive of the upper threaded rod 112. The elastic telescopic rod 21 drives the arc plate 22 and the clamping groove of the upper clamping plate 31 to clamp and fix the upper reinforcing bar. The corresponding aligning plate 32 of the upper clamping plate 31 abuts against the right end of the longitudinal rib of the upper reinforcing bar (e.g., Figure 8 As shown, this invention clamps and fixes the upper reinforcing bar while simultaneously positioning its longitudinal ribs, thereby aligning the longitudinal ribs of the upper and lower reinforcing bars vertically. This prevents misalignment of the longitudinal ribs during welding, which would reduce the effective cross-sectional area at the joint and ensure the quality of the weld. The invention utilizes a clamping head 12, an arc-shaped plate 22, a clamping groove, an alignment plate 32, and an adjustment group 33 to form a directional positioning system based on the structural characteristics of the reinforcing bars, rather than a simple centering structure. This directional positioning system achieves precise positioning and vertical alignment of the longitudinal ribs of the reinforcing bars.

[0040] Initially, the transmission plate 24 is at its left limit position, and at this time, the left locking group locks the extension section of the elastic telescopic rod 21, so that the arc plate 22 and the clamping groove of the upper clamping plate 31 cooperate to rigidly clamp and fix the upper rebar. After the upper rebar is clamped and fixed, the electric slider assembly 23 is controlled to drive the transmission plate 24 to move to the right limit position to adapt to rapid on-site construction. During this process, the left locking group releases the locking of the extension section of the elastic telescopic rod 21, so that the arc plate 22 and the clamping groove of the upper clamping plate 31 cooperate to elastically clamp the upper rebar, thereby allowing the rebar to move downward relative to the arc plate 22. At the same time, the transmission plate 24 drives the alignment group 25 to press the upper rebar against the clamping groove of the clamping plate 31 in a symmetrical manner from top to bottom, so as to achieve vertical alignment of the upper rebar, ensure its vertical arrangement, and prevent it from slight axial deviation. This not only solves the clamping deviation problem, but also, through the upper and lower force balance mechanism, allows rebars with a large length-to-diameter ratio to maintain a vertically stable clamping state. Furthermore, the transmission plate 24 drives the pressing group 26 to elastically press down the upper reinforcing bar, ensuring that its lower end and the upper end of the lower reinforcing bar are tightly and evenly fitted together. When the transmission plate 24 moves to the right limit position, the right locking group locks the telescopic section of the elastic telescopic rod 21, realizing the switching between elastic clamping and rigid clamping. This ensures that the clamped and fixed reinforcing bar is stably arranged vertically, with its lower end and the upper end of the lower reinforcing bar tightly and evenly fitted together. At the same time, the locking group controls the clamping state and provides a rigid foundation for the pressure welding of the pressing group 15. After the reinforcing bar welding is completed, the electric slider assembly 23 controls the transmission plate 24 to move to the left limit position. The transmission plate 24 then drives the alignment group 25 and the pressing group 26 to return to their initial positions.

[0041] See Figure 2 , Figure 3 and Figure 8 The clamping plate 31 has square holes that correspond one-to-one with the alignment plate 32. The adjustment group 33 includes sliding rods 331 that are slidably installed in the square holes. The alignment plate 32 is slidably installed on the side of the sliding rods 331 near the middle of the clamping plate 31 by means of a top extension spring 332. A synchronizing rod 333 is fixedly installed on the side of the sliding rods 331 that are arranged vertically away from the middle of the clamping plate 31. A U-shaped adjusting plate 334 is fixedly installed on the right end of the two synchronizing rods 333 corresponding to the same clamping plate 31. The adjusting plate 334 and a plurality of limiting rods 335 fixedly installed on the right end of the clamping plate 31 are slidably connected. An adjusting screw 336 is threadedly connected to the adjusting plate 334, and the left end of the adjusting screw 336 is rotatably installed in the middle of the right end of the clamping plate 31.

[0042] Adjustment group 33 is used to adjust the left and right position of alignment plate 32; specifically, by turning adjustment screw 336, adjustment plate 334 moves left and right under the action of limit rod 335. Adjustment plate 334 drives alignment plate 32 to move left and right through synchronous rod 333 and sliding rod 331, thereby adjusting the left and right position of alignment plate 32. When the reinforcing bar is placed in the clamping groove of clamping plate 31 and before the reinforcing bar abuts against the inner wall of clamping groove, alignment plate 32 is pressed against the outer side of reinforcing bar under the action of extension spring 332, and under the action of the curved surface of reinforcing bar, alignment plate 32 will move away from reinforcing bar. When reinforcing bar abuts against the inner wall of clamping groove, alignment plate 32 abuts against the right end of the longitudinal rib of the corresponding reinforcing bar (e.g., Figure 8 (As shown); when clamping and fixing steel bars of different diameters, by adjusting the left and right positions of the alignment plate 32, it can be ensured that the alignment plate 32 can always abut against the right end of the longitudinal rib of the corresponding steel bar, so as to clamp and fix steel bars of different sizes while positioning their longitudinal ribs.

[0043] See Figure 5 , Figure 6 and Figure 7 The locking assembly includes multiple circumferentially evenly arranged elastic locking rods 27 that are slidably installed on the outside of the fixed section of the elastic telescopic rod 21. Locking holes are provided on the outside of the telescopic section of the elastic telescopic rod 21 and at positions corresponding to the elastic locking rods 27. Mutating blocks 244 are installed at both ends of the transmission plate 24 and at positions corresponding to the elastic locking rods 27. The end of the mating block 244 away from the transmission plate 24 is set as an inclined surface that mates with the corresponding elastic locking rod 27. The end of the elastic locking rod 27 that mates with the inclined surface of the mating block 244 is hemispherical.

[0044] The locking assembly is used to lock the telescopic section of the elastic telescopic rod 21. Specifically, initially, the transmission plate 24 is located at the left extreme position. At this time, the plane of the mating block 244 at the left end of the transmission plate 24 presses against the corresponding elastic locking rod 27. The corresponding elastic locking rod 27 is then inserted into the corresponding locking hole and accumulates rebound force, thereby locking the telescopic section of the elastic telescopic rod 21. As the transmission plate 24 moves from the left extreme position to the right extreme position, the mating block 244 at the left end of the transmission plate 24 gradually separates from the corresponding elastic locking rod 27. After complete separation, the elastic locking rod 27 moves out of the locking hole under its own rebound force, thereby releasing the elastic telescopic rod 21. Locking of the telescopic section: When the inclined surface of the mating block 244 at the right end of the transmission plate 24 contacts the corresponding elastic locking rod 27, and the transmission plate 24 continues to move to the right, the inclined surface of the mating block 244 will push the corresponding elastic locking rod 27 into the corresponding locking hole, thereby locking the telescopic section of the elastic telescopic rod 21 again. When the transmission plate 24 is at the right limit position, the plane of the mating block 244 at the right end of the transmission plate 24 presses against the corresponding elastic locking rod 27, and the elastic locking rod 27 remains inserted into the corresponding locking hole. The elastic locking rod 27 is only inserted into the corresponding locking hole and locked when the transmission plate 24 is at the left or right limit position.

[0045] See Figure 2 and Figure 4 The alignment group 25 includes two inclined plates 251 arranged symmetrically at the top and bottom, which are hinged to the right end of the transmission plate 24 by a torsion spring shaft. The right ends of the two inclined plates 251 are inclined in a direction away from each other. An arc plate 22 is located between the two inclined plates 251. The right end of the inclined plate 251 is rotatably mounted with an alignment roller 252. The torsion spring shaft is provided with a large elastic force.

[0046] The alignment group 25 is used for vertical alignment of the reinforcing bars. Specifically, the positioning longitudinal ribs of the aforementioned alignment plate 32 provide a reference for the vertical alignment of the alignment roller 252. Under this reference, when the extension section of the elastic telescopic rod 21 is in an unlocked state and the transmission plate 24 continues to move to the right limit position, the clamping grooves of the arc plate 22 and the upper clamping plate 31 cooperate to elastically clamp the upper reinforcing bar. The transmission plate 24 drives the alignment roller 252 to press against the reinforcing bar through the inclined plate 251. The pressing position is symmetrically distributed above and below the clamping position of the arc plate 22. As the transmission plate 24 continues to move, under the action of the torsion spring shaft, the inclined plate 251 drives the two alignment rollers 252 to move away from each other. Under the action of the rebound force of the torsion spring shaft, the alignment roller 252 still presses against the reinforcing bar, ultimately making the upper reinforcing bar... The upper reinforcing bar is held firmly against the clamping groove of the clamping plate 31, keeping it vertical. This prevents the upper welded reinforcing bar from tilting along the arc plate 22 towards the corresponding clamping plate 31 due to single-point clamping and the long overhang length caused by the clamping position being close to the welding end. Simultaneously, the upper and lower positioning rollers 252 provide elastic support for the upper reinforcing bar located on the upper and lower sides of the arc plate 22. A certain distance exists between the positioning rollers 252 and the arc plate 22, and the upper positioning roller 252 is farther from the lower end of the upper reinforcing bar. This reduces the overturning moment generated by external forces on the clamping position of the arc plate 22 on the upper reinforcing bar, allowing the arc plate 22 and the upper clamping plate 31 to hold and fix the upper reinforcing bar without requiring a large clamping force, thus improving the clamping stability of the upper reinforcing bar. When the transmission plate 24 moves to the right limit position, the clamping grooves of the arc plate 22 and the upper clamping plate 31 rigidly clamp the upper reinforcing bar, ensuring that the reinforcing bar is vertically arranged and in a stable clamping state.

[0047] See Figure 4 and Figure 5 An installation groove is provided in the middle of the right arc surface of the arc plate 22. The pressing group 26 includes a sliding plate 261 that is slidably installed in the installation groove. Multiple pressing blocks 262 are fixedly installed on the right side of the sliding plate 261 and are evenly arranged vertically. Multiple guide rods 263 are slidably installed on the sliding plate 261 and are evenly arranged front and back. The guide rods 263 are slidably installed in the installation groove. A return spring 264 is connected between the lower end of the sliding plate 261 and the circular plate fixedly sleeved on the outer side of the lower end of the guide rods 263. Guide blocks 265 are fixedly installed at both the front and rear ends of the sliding plate 261. Guide grooves 221 are provided on the front and rear inner walls of the installation groove. The upper end of the guide groove 221 is inclined to the left and the lower end is vertically arranged. The guide blocks 265 are slidably installed in the corresponding guide grooves 221.

[0048] See Figure 4 , Figure 5 , Figure 6 and Figure 9Two L-shaped downward pressure rods 266 are fixedly installed on the left end of the sliding plate 261, arranged symmetrically front to back. The horizontal section of the L-shaped downward pressure rod 266 slides through the arc-shaped surface on the left side of the arc plate 22. The transmission plate 24 is equipped with downward pressure plates 241 that correspond one-to-one with the L-shaped downward pressure rods 266. A square plate 242 is fixedly installed on the left end of the downward pressure plate 241, and a pressure spring 243 is connected between the square plate 242 and the left end of the transmission plate 24. The lower right side of the downward pressure plate 241 is set as an inclined surface that cooperates with the vertical section of the corresponding L-shaped downward pressure rod 266. The elastic force of the pressure spring 243 is much greater than the elastic force of the return spring 264. The end of the vertical section of the L-shaped downward pressure rod 266 that cooperates with the inclined surface of the downward pressure plate 241 is hemispherical.

[0049] The lower pressure assembly 26 is used to ensure that the lower end of the upper reinforcing bar and the upper end of the lower reinforcing bar are tightly fitted together. Specifically, the aforementioned positioning roller 252 supports the reinforcing bar, providing a stable condition for the lower pressure block 262 to press the end of the transverse rib of the reinforcing bar. Under this condition, when the transmission plate 24 moves to the right from the left extreme position, the transmission plate 24 drives the lower pressure plate 241 to move to the right. The inclined surface of the lower pressure plate 241 and the vertical section of the L-shaped lower pressure rod 266 cooperate to drive the sliding plate 261 to move downward. At the same time, under the action of the inclined section of the guide groove 221 and the guide block 265, the sliding plate 26... 1. While moving downwards, the sliding plate 261 moves towards the direction of the reinforcing bar, causing the lower pressure block 262 to clamp onto the upper end of the corresponding transverse rib on the upper reinforcing bar. Then, the guide block 265 moves to the vertical section of the guide groove 221, causing the sliding plate 261 to move only vertically downwards. This allows the sliding plate 261 to press down on the corresponding transverse rib on the upper reinforcing bar through the lower pressure block 262, so that the upper reinforcing bar is pressed against the upper end of the lower reinforcing bar under the action of the lower pressure block 262. During this process, the sliding plate 261 remains vertically arranged under the action of the guide rod 263.

[0050] When the lower end of the upper rebar abuts against the upper end of the lower rebar, the sliding plate 261 can no longer drive the lower pressure block 262 to move downward. At this time, the vertical section of the L-shaped lower pressure rod 266 is still in contact with the inclined surface of the lower pressure plate 241. The transmission plate 24 continues to move to the right. Blocked by the vertical section of the L-shaped lower pressure rod 266, the lower pressure plate 241 will move to the left relative to the transmission plate 24 and stretch the compression spring 243 through the square plate 242. At the same time, since the upper rebar is axially vertically arranged at this time, the welded ends of the upper rebar and the welded ends of the lower rebar can fit tightly and evenly during welding. The first step ensures the quality of the weld seam of the reinforcing bar; when the transmission plate 24 moves to the right limit position, the elastic locking rod 27 located on the right is inserted into the corresponding locking hole to lock the telescopic section of the elastic telescopic rod 21, so that the arc plate 22 rigidly clamps the reinforcing bar. When welding the two sections of reinforcing bar, the pressure group 15 drives the movable plate 16 to move downward, and finally drives the clamped upper reinforcing bar to rigidly press down on the upper end of the lower reinforcing bar. After the welding of the two sections of reinforcing bar is completed, when the transmission plate 24 moves to the left to the initial position, the sliding plate 261 returns to the initial position under the action of the return spring 264.

[0051] In summary, the welding clamp for fabricating reinforcing bars in building foundation columns provided by this invention is designed around the construction site requirements of "portability, flexible mobility, and layer-by-layer lap welding". Through the coordinated combination of multiple key components such as alignment unit 3, clamping unit 2, alignment group 25, pressing group 26, locking group, and adjustment group 33, it achieves integrated control of multiple functions such as precise longitudinal rib alignment, dynamic vertical alignment, continuous and stable vertical pressure, and tight end fitting of reinforcing bars. It solves the key technical problems of longitudinal rib misalignment, clamping deviation, and poor fitting in existing reinforcing bar welding clamps, ensuring the welding quality of reinforcing bars, while still retaining the portability and on-site construction flexibility of the welding clamp.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding clamp for fabricating reinforcing bars in building foundation columns, comprising a butt joint unit, the butt joint unit including two vertically arranged screw assemblies, the lower screw assembly being provided with a clamping head, characterized in that, Also includes: The clamping unit includes an arc-shaped plate connected to the upper screw assembly via an elastic telescopic rod. A transmission plate is slidably sleeved on the outer side of the fixed section of the elastic telescopic rod. A positioning assembly is provided on the right side of the transmission plate. A pressing assembly is connected between the arc-shaped plate and the transmission plate. The alignment unit, which corresponds one-to-one with the screw assembly, includes a clamping plate set on the docking unit. A V-shaped clamping groove is opened in the middle of the left end of the clamping plate. Multiple alignment plates are set on both inner side walls of the clamping groove. An adjustment group for adjusting the left and right positions of the alignment plates is installed between the multiple alignment plates and the clamping plate. The alignment group includes inclined plates and alignment rollers arranged symmetrically at the top and bottom. The inclined plates are hinged by torsion spring shafts and generate bidirectional resistance force. Using the lower reinforcing bar in a fixed state as a reference, the upper reinforcing bar is clamped by the arc plate and clamping groove, while the alignment plate abuts against the right end of the longitudinal rib of the corresponding reinforcing bar, automatically aligning the longitudinal ribs of the two reinforcing bars vertically. Then, the transmission plate moves to the right to control the alignment roller to press the upper reinforcing bar to make it vertically centered. At the same time, the transmission plate drives the lower pressing group to press down the transverse rib of the upper reinforcing bar, so that the ends of the two reinforcing bars fit tightly and evenly.

2. The welding clamp for fabricating reinforcing bars in building foundation columns according to claim 1, characterized in that, The clamping plate has square holes that correspond one-to-one with the alignment plate. The adjustment group includes sliding rods that are slidably installed in the square holes. The alignment plate is slidably installed on the side of the sliding rods near the middle of the clamping plate by means of a top extension spring. Multiple sliding rods arranged vertically are fixedly installed on the side away from the middle of the clamping plate. U-shaped adjustment plates are fixedly installed on the right ends of the two synchronization rods corresponding to the same clamping plate.

3. The welding clamp for fabricating reinforcing bars for building foundation columns according to claim 2, characterized in that, The adjusting plate and multiple limiting rods fixedly installed on the right end of the clamping plate are slidably connected left and right. The adjusting plate is threaded with an adjusting screw, and the left end of the adjusting screw is rotatably installed in the middle of the right end of the clamping plate.

4. The welding clamp for fabricating reinforcing bars for building foundation columns according to claim 1, characterized in that, The inclined plate is hinged to the right end of the transmission plate via a torsion spring shaft. The right ends of the two inclined plates are arranged at an angle away from each other. The arc-shaped plate is located between the two inclined plates. The positioning roller is rotatably installed on the right end of the inclined plate.

5. A welding clamp for fabricating reinforcing bars for building foundation columns according to claim 1, characterized in that, An installation groove is provided in the middle of the right arc surface of the arc plate. The pressing group includes a sliding plate that is slidably installed in the installation groove. Multiple pressing blocks are fixedly installed on the right side of the sliding plate and evenly arranged vertically.

6. A welding clamp for fabricating reinforcing bars for building foundation columns according to claim 5, characterized in that, Multiple guide rods are evenly arranged front and back on the sliding plate and slide up and down. The guide rods slide left and right in the mounting groove. There is a return spring between the lower end of the sliding plate and the circular plate fixedly sleeved on the outer side of the lower end of the guide rod.

7. A welding clamp for fabricating reinforcing bars for building foundation columns according to claim 5, characterized in that, Guide blocks are fixedly installed at both ends of the sliding plate. Guide grooves are opened on the inner walls of the front and rear of the mounting groove. The upper end of the guide groove is arranged to the left and the lower end is arranged vertically. The guide blocks are slidably installed in the corresponding guide grooves.

8. A welding fixture for fabricating reinforcing bars for building foundation columns according to claim 5, characterized in that, Two L-shaped pressure rods are fixedly installed on the left end of the sliding plate, arranged symmetrically front to back. The horizontal section of the L-shaped pressure rod slides through the arc surface on the left side of the arc plate. The transmission plate is equipped with pressure plates that correspond one-to-one with the L-shaped pressure rods. A square plate is fixedly installed on the left end of the pressure plate, and a pressure spring is connected between the square plate and the left end of the transmission plate. The lower right side of the pressure plate is set as an inclined surface that cooperates with the vertical section of the corresponding L-shaped pressure rod.

9. A welding clamp for fabricating reinforcing bars for building foundation columns according to claim 1, characterized in that, The fixed section of the elastic telescopic rod is equipped with two locking groups arranged on the left and right. Each locking group includes multiple circumferentially evenly arranged elastic locking rods that are slidably installed on the outside of the fixed section of the elastic telescopic rod. Locking holes are provided on the outside of the telescopic section of the elastic telescopic rod at the positions corresponding to the elastic locking rods.

10. A welding clamp for fabricating reinforcing bars for building foundation columns according to claim 9, characterized in that, Both ends of the transmission plate are equipped with mating blocks corresponding to the elastic locking rods. The end of each mating block away from the transmission plate is set as an inclined surface that mates with the corresponding elastic locking rod.

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