Prefabricated floor beam welding device

Abstract

The application provides a prefabricated floor truss welding device, belonging to the technical field of floor truss processing, which comprises a rack, a first roller conveyor is arranged on one side of the rack, a second roller conveyor is arranged on the other side of the rack, and a plurality of welding assemblies are assembled on the rack, a fixing frame is arranged between the first roller conveyor and the second roller conveyor, a movable frame is slidably assembled on the fixing frame, and a displacement assembly for driving the movable frame to move left and right is further arranged on the fixing frame; a plurality of lifting assemblies are arranged on the movable frame, a pressing frame is connected to the output end of each lifting assembly, and pressing plates are arranged on the two sides of the bottom of the pressing frame; two groups of support plates that are symmetrically distributed are arranged on the inner side of the pressing frame. Compared with the traditional processing mode, the structure does not need manual alignment and individual welding operation, is convenient and labor-saving to operate, greatly reduces the labor intensity, and is favorable for improving the production efficiency.

Description

Technical Field

[0001] This application relates to the field of truss floor decking processing technology, specifically to a precast floor truss welding device. Background Technology

[0002] Precast floor slabs, as one of the core components of industrialized building construction, are widely used in the floor structures of various buildings, including multi-story residential buildings, office buildings, and industrial plants, thanks to their advantages such as standardized factory production, stable and controllable quality, and rapid on-site construction. This effectively reduces on-site wet work and construction waste, and significantly shortens the construction period. To overcome the shortcomings of traditional precast floor slabs, such as limited span and insufficient overall integrity, steel truss floor decks have emerged. As an important type of unsupported profiled composite floor deck, they integrate the steel truss with the base slab for precast construction. This not only continues the advantages of industrialized production of precast components but also allows for the formation of a high-strength, highly integrated composite floor slab structure through subsequent on-site concrete pouring, meeting the needs of large-space, column-free building layouts.

[0003] Steel truss floor decking is prefabricated from two main parts: a steel truss and a base slab, using a welding process. The steel truss, with steel bars serving as the top chord, bottom chord, and web members, is connected by resistance spot welding to form stable triangular truss units. The base slab is made of profiled sheet metal. During factory production, the steel truss and base slab are welded together as a single unit using resistance spot welding, ensuring a reliable connection and coordinated load-bearing capacity. The welding quality between the steel truss and the base slab directly determines the structural reliability and coordinated load-bearing performance of the prefabricated floor decking component, and is a crucial process for ensuring the load-bearing capacity of the subsequent concrete composite structure.

[0004] Referring to Chinese patent document CN217166889U, entitled "A Welding Processing Device for Steel Truss Floor Decking," the device includes a processing table. A first mounting frame and a second mounting frame are fixedly connected to the upper surface of the processing table. A drive motor is fixedly connected to the outer wall of the first mounting frame, and a drive rod is fixedly connected to the output end of the drive motor. The end of the drive rod away from the drive motor passes through the first mounting frame and is fixedly fitted with two pressing wheels. A rotating rod is rotatably connected to the inner wall of the second mounting frame. This device moves the floor deck via a transmission belt, and the rotating rod drives a welding gun to move reciprocally up and down via a crank assembly and a movable rod. During the movement of the steel truss and the floor deck, the welding gun performs spot welding operations, which improves welding efficiency.

[0005] Regarding the aforementioned technical solutions, during the synchronous conveying of the steel truss and the base plate, relative positional misalignment is prone to occur. This leads to deviations in the spacing between adjacent steel trusses, directly affecting the consistency and reliability of the welded connections, and consequently reducing the overall processing quality of the components. Although the initial precise alignment of the steel truss and the base plate can be achieved manually using equipment, such operations rely on manual pre-positioning and initial fixing, which not only makes it difficult to adapt to the needs of automated mass production but also restricts the production efficiency of the welding process. Summary of the Invention

[0006] In view of this, this application provides a precast floor slab truss welding device, which is mainly used to solve the problem that manual pre-positioning is difficult to adapt to automated mass production and restricts production efficiency during the initial welding of steel trusses and base plates.

[0007] To solve the above-mentioned technical problems, this application provides a precast floor slab truss welding device, comprising: 1. A precast floor slab truss welding device, including a frame, a first roller conveyor on one side of the frame and a second roller conveyor on the other side, and multiple welding components mounted on the frame; a fixed frame is provided between the first roller conveyor and the second roller conveyor, a movable frame is slidably mounted on the fixed frame, and a displacement component for driving the movable frame to move left and right is also provided on the fixed frame; multiple lifting components are provided on the movable frame, the output end of each lifting component is connected to a pressure frame, and pressure plates are provided on both sides of the bottom of the pressure frame; The inner side of the pressure frame is provided with two sets of symmetrically distributed support plates, which together form an inverted V-shaped structure. The second roller conveyor has slide rails on both sides, with a first drive assembly slidably mounted on the side of the slide rail closest to the fixed frame. The first drive assembly and the displacement assembly move synchronously to drive the truss and base plate to be conveyed synchronously. A second drive assembly is provided on the side of the slide rail closest to the frame, used to drive the welded truss and base plate to be conveyed along the second roller conveyor. The first drive assembly is provided with a push rod and a motion assembly that pushes the push rod to move vertically. A stop plate is provided at the top of the push rod for positioning the truss and base plate.

[0008] By adopting the above technical solution, after the base plate and steel truss are placed at the initial work position, they are conveyed by the first roller conveyor to the space between the first drive assembly and the pressure frame. The stop plate forms a limiting block for the base plate and steel truss. Subsequently, the lifting assembly drives the pressure frame to move downward, causing the pressure plate to move downward synchronously. The support plate with an inverted V-shaped structure can correct and align the offset steel truss. At the same time, the pressure plate presses and fixes the web members of the steel truss to the base plate. Then, the first drive assembly and the displacement assembly work together synchronously to drive the steel truss and base plate to be conveyed synchronously to the designated welding area below the frame. At this time, the welding assembly simultaneously completes the welding operations of multiple steel trusses and base plates. After welding is completed, the first drive assembly resets and continues to drive the subsequent steel trusses and base plates to be processed forward. The displacement assembly drives the movable frame to move to the left of the first drive assembly. In the subsequent continuous welding process, the lifting assembly works synchronously with the first drive assembly and the welding assembly to continuously limit and correct the subsequently conveyed steel trusses and base plates, avoiding significant positional deviations and ultimately ensuring the processing accuracy and quality stability of the components.

[0009] Optionally, a connecting arm is provided on the side of the pressure frame near the first roller conveyor, and a limiting member with an inverted V-shaped structure is provided at the bottom of the connecting arm; a third cylinder is mounted on the movable frame, and the output end of the third cylinder is fixedly connected to the connecting arm; a plug rod is fixed on the side of the connecting arm near the pressure frame, and a fixing plate is provided between the pressure frame and the support plate, with the plug rod passing through the fixing plate and slidably connected to it.

[0010] By adopting the above technical solution, in the initial positioning stage of the steel truss and the base plate, the coordinated cooperation between the limiting component and the support plate can not only increase the contact area with the steel truss and improve the stability of the limiting support, thus helping the steel truss to quickly return to its position; but also, after the front end of the steel truss is fixed, the limiting component can move backward to correct and align the rear end of the steel truss, so that the entire steel truss always maintains a precise posture, providing a solid guarantee for the consistency and reliability of subsequent welding operations.

[0011] Optionally, a support frame is provided on the side of the fixed frame near the first roller conveyor.

[0012] By adopting the above technical solution, after the movable frame and the pressure frame and the first drive component complete the positioning and conveying coordinated action, the two will move to the top of the support frame. During the process of limiting the subsequent steel truss, the pressure plate at the bottom of the pressure frame cooperates with the support frame to flatten and straighten the triangular area at the bottom of the web members of the steel truss, effectively increasing the contact area between the web members and the bottom plate, and providing a guarantee for improving the welding strength.

[0013] Optionally, a lifting plate is provided above the support frame, and insert plates are fixedly connected to both sides of the bottom of the lifting plate. The insert plates are movably inserted into the top of the support frame, and an eighth cylinder is fixedly mounted on the support frame. The output end of the eighth cylinder is fixedly connected to the bottom surface of the lifting plate.

[0014] By adopting the above technical solution, when the base plate and the steel truss are transported and moved, the lifting plate can descend synchronously, avoiding direct contact with the base plate, thereby reducing the frictional wear on the lifting plate and effectively extending its service life.

[0015] Optionally, the first drive assembly includes a support plate, with both ends of the support plate slidably mounted on corresponding slide rails; a second column is fixedly connected to the top of both sides of the support plate, a seventh cylinder is fixedly connected to the top of the second column, a second movable plate is movably sleeved on the second column, the output end of the seventh cylinder is fixedly connected to the top surface of the second movable plate, a sixth cylinder is fixedly mounted on the slide rail, and its output end is fixedly connected to the support plate; the second drive assembly includes a mounting block, a first column is fixedly connected to the top of the mounting block, a fourth cylinder is fixedly connected to the top of the first column, a first movable plate is movably sleeved on the first column, the output end of the fourth cylinder is fixedly connected to the first movable plate, the mounting block is slidably mounted on the slide rail, and a fifth cylinder is fixedly mounted on the slide rail, its output end is fixedly connected to the mounting block.

[0016] Optionally, both the mounting block and the support plate are equipped with rollers, which are adapted to the slide rail.

[0017] By adopting the above technical solution, the roller replaces the two and directly contacts the slide rail, transforming sliding friction into rolling friction. This not only makes the movement of the mounting block and the bearing plate along the slide rail smoother and more stable, but also significantly reduces the wear of the transmission contact surface and effectively extends the service life of the components.

[0018] Optionally, the lifting assembly includes a second cylinder, a connecting rod, and a sleeve. The second cylinder and the sleeve are both fixedly installed on the movable frame. The output end of the second cylinder and the bottom end of the connecting rod are both fixedly connected to the pressure frame. The connecting rod is movably sleeved inside the sleeve.

[0019] Optionally, the displacement assembly includes a lead screw, a crossbar, and a motor. The lead screw is rotatably connected to the top of the fixed frame, the crossbar is fixed to the fixed frame and located below the lead screw, the output end of the motor is fixedly connected to the lead screw, and the movable frame is threadedly connected to the lead screw and slidably connected to the crossbar.

[0020] Optionally, the motion assembly includes a ninth cylinder and a movable frame. The bottom of the support plate has a mounting hole, and the movable frame is movably mounted below the support plate through the mounting hole. The ninth cylinder is fixedly mounted on the bottom of the support plate, and its output end is fixedly connected to the movable frame. A push plate is provided on one side of the movable frame, and the push plate abuts against the push rod to drive the push rod to move vertically when the movable frame moves horizontally.

[0021] Optionally, the welding assembly includes a first cylinder and a horizontal plate. The output end of the first cylinder is fixedly connected to an upper electrode seat, the bottom of the upper electrode seat is fixedly connected to an upper electrode block, and the upper surface of the horizontal plate is fixedly connected to a lower electrode block that cooperates with the upper electrode block.

[0022] In summary, compared with the prior art, this application includes the following beneficial technical effects: 1. By configuring a positioning and feeding mechanism, the steel truss and the base plate can be automatically aligned during the initial assembly and welding stage, and smoothly transported to the welding area. Multiple steel trusses can be welded and fixed simultaneously. Compared to traditional processing methods, this structure eliminates the need for manual alignment and individual welding, making operation convenient and labor-saving, significantly reducing labor intensity and improving production efficiency. Furthermore, during subsequent welding, this mechanism can reliably limit the position of unwelded steel trusses, effectively preventing positional displacement and providing stable and reliable operating conditions for subsequent welding processes.

[0023] 2. Through the coordinated operation of the support frame and the bottom pressure plate of the pressure frame, the triangular area at the bottom of the web members can be flattened and straightened during the subsequent reinforcement truss positioning process, effectively solving the unevenness problem that is prone to occur in this area. This design can increase the actual contact area between the web members and the base plate, optimize the welding stress interface, and thus improve the welding strength and connection stability of the reinforcement truss and the base plate. At the same time, the continuous conveying rhythm of the action coordination and adaptation device of the support frame, movable frame, and pressure frame can complete the correction of the triangular area without affecting the continuity of the automated production process, achieving the dual goals of improving welding quality and ensuring production efficiency, and further enhancing the structural performance reliability of the formed components. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a precast floor slab truss welding device according to this application; Figure 2 This is a top view of the positioning and feeding mechanism and the frame in this application; Figure 3 This is a schematic diagram of the left-side structure of the positioning and feeding mechanism and the support frame in this application; Figure 4 This is a schematic diagram of the overall structure of the lifting assembly, pressure frame, and limiting component in this application; Figure 5 This is a schematic diagram of the structure of the first driving component in this application; Figure 6 This is a structural schematic diagram of the movable frame, push plate, and stop plate in this application; Figure 7 This is a schematic diagram of the structure of the second driving component in this application; Figure 8 This is a schematic diagram of the structure of the limiting component when it is away from the pressure frame in this application; Figure 9 This is a right-side structural schematic diagram of the pressure frame, fixing plate, and support plate in this application; Figure 10 This is a schematic diagram showing the positions of the movable frame and the support plate during the welding process of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Frame; 11. First roller conveyor; 12. Second roller conveyor; 13. First cylinder; 131. Upper electrode holder; 132. Upper electrode block; 14. Horizontal plate; 141. Lower electrode block; 2. Fixed frame; 21. Lead screw; 22. Crossbar; 23. Motor; 3. Movable frame; 31. Second cylinder; 32. Pressure frame; 321. Connecting rod; 322. Fixed plate; 33. Support plate; 34. Pressure plate; 35. Connecting arm; 351. Limiting component; 352. Third cylinder; 353. 36. Insert rod; 4. Sleeve; 41. Slide rail; 41. Mounting block; 411. First column; 412. Fourth cylinder; 413. First movable plate; 414. Fifth cylinder; 42. Bearing plate; 421. Roller; 422. Mounting hole; 423. Sixth cylinder; 43. Second column; 44. Seventh cylinder; 45. Second movable plate; 5. Support frame; 51. Lifting plate; 511. Insert plate; 52. Eighth cylinder; 6. Moving frame; 61. Push plate; 62. Stop plate; 63. Push rod; 64. Ninth cylinder. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will be combined with the embodiments of this application. Figures 1-10 The technical solutions of the embodiments of this application are clearly and completely described herein. All other embodiments obtained by those skilled in the art based on the described embodiments are within the scope of protection of this application.

[0027] Reference Figure 1 and Figure 2This embodiment provides a precast floor slab truss welding device, including a frame 1, a conveying assembly, a welding assembly, and a positioning and feeding mechanism. The frame 1 serves as the basic installation framework for the device, providing a stable and uniform installation reference for the conveying assembly, welding assembly, and positioning and feeding mechanism. The conveying assembly is symmetrically arranged on both sides of the frame 1, primarily responsible for supporting the precast base slab and steel truss, and working with the positioning and feeding mechanism to smoothly convey them to the designated working position. The welding assembly is arranged in groups of two, with three groups arranged linearly at equal intervals along the length of the frame 1, welding the connection nodes between the steel truss and the base slab to achieve a firm fixation. The positioning and feeding mechanism is located between the two conveying assemblies, integrating positioning and feeding functions. It can calibrate and fix the relative position of the steel truss and the base slab, and drive the positioned components to smoothly move to the welding area, effectively suppressing positional deviation during conveying and ensuring stable welding quality. The number of welding assemblies can be adjusted according to actual processing requirements.

[0028] Among them, reference Figure 1 and Figure 2 The conveying components include a first roller conveyor 11 and a second roller conveyor 12, both of which employ a powered conveying structure and work together to transfer the workpieces. Before welding begins, the first roller conveyor 11 moves the base plate and steel truss to the positioning area; after welding is completed, the second roller conveyor 12 transfers the welded steel truss along with the base plate to the subsequent process area; during welding, the positioning and feeding mechanism drives the steel truss and base plate to move smoothly and orderly, ensuring welding continuity. Both the first roller conveyor 11 and the second roller conveyor 12 are commonly used conveying equipment in the prior art, and their specific structures and working principles will not be described in detail here.

[0029] Among them, reference Figure 1 and Figure 2 The welding assembly includes a first cylinder 13 and a horizontal plate 14. The first cylinder 13 is fixedly installed on the frame 1, with its output end facing vertically downward and fixedly connected to an upper electrode seat 131. An upper electrode block 132 is fixedly connected to the bottom of the upper electrode seat 131. The horizontal plate 14 is fixedly installed at the bottom of the frame 1, and its installation position corresponds vertically to that of the first cylinder 13. A lower electrode block 141 that cooperates with the upper electrode block 132 is fixedly connected to the upper surface of the horizontal plate 14.

[0030] During welding, the steel truss and base plate move between the upper electrode block 132 and the lower electrode block 141 under the drive of the positioning and feeding mechanism. Subsequently, the output shaft of the first cylinder 13 extends, driving the upper electrode seat 131 to move downward, so that the lower upper electrode block 132 and the corresponding lower electrode block 141 cooperate with each other to press the triangular node area formed by the web members of the steel truss and complete the welding.

[0031] Among them, reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 10 The positioning and feeding mechanism includes a fixed frame 2, a movable frame 3, a displacement assembly, a lifting assembly, a pressure frame 32, a support plate 33, a pressure plate 34, a slide rail 4, a first drive assembly, a second drive assembly, a stop plate 62, a push rod 63, and a motion assembly. The fixed frame 2 is located between the first roller conveyor 11 and the second roller conveyor 12, and the movable frame 3 is slidably mounted on the top of the fixed frame 2. There are two sets of displacement assemblies, which are symmetrically arranged on the fixed frame 2 to drive the movable frame 3 to adjust left and right along the moving direction of the steel truss and the base plate. There are three lifting assemblies, which are installed at intervals on the movable frame 3. The number of pressure frames 32 corresponds one-to-one with the number of lifting assemblies. The number of support plates 33 and pressure plates 34 is twice that of pressure frames 32. The pressure frames 32 are fixedly installed at the output end of the lifting assembly. Every two pressure plates 34 are installed on the bottom sides of the pressure frame 32, and every two support plates 33 are installed on the inner side of the pressure frame 32, arranged in an inverted V shape. Two sets of slide rails 4 are symmetrically arranged on both sides of the second roller conveyor 12. The first drive assembly is located on the side of the slide rail 4 near the fixed frame 2, and two second drive assemblies are symmetrically arranged on the side of the slide rail 4 near the frame 1. There are three stop plates 62, which are linearly arranged on the push rod 63 for positioning the steel truss and the base plate. The motion assembly and the push rod 63 are both mounted on the first drive assembly. The motion assembly is used to drive the push rod 63 to move vertically. In this embodiment, the number and position of the lifting assembly need to be adjusted according to the number and arrangement of the welding assemblies, and its number is set to half the number of welding assemblies.

[0032] Specifically, the displacement assembly includes a lead screw 21, a crossbar 22, and a motor 23. The lead screw 21 is rotatably connected to the top of the fixed frame 2, and the crossbar 22 is fixedly installed on the fixed frame 2 and located below the lead screw 21. The motor 23 is fixedly mounted on the fixed frame 2, and its output end is fixedly connected to the lead screw 21 through a coupling. The movable frame 3 is threadedly connected to the lead screw 21, and the bottom of the movable frame 3 is slidably sleeved on the outside of the crossbar 22 to make its movement more stable.

[0033] Specifically, the lifting assembly includes a second cylinder 31, a connecting rod 321, and a sleeve 36. Both the second cylinder 31 and the sleeve 36 are fixedly mounted on the movable frame 3. The output end of the second cylinder 31 and the bottom end of the connecting rod 321 are fixedly connected to the pressure frame 32. The connecting rod 321 is movably sleeved inside the sleeve 36. The connecting rod 321, in cooperation with the sleeve 36, limits the movement direction of the pressure frame 32, ensuring smooth lifting.

[0034] Specifically, the first drive assembly includes a support plate 42, with both ends of the support plate 42 slidably mounted on corresponding slide rails 4; second columns 43 are fixedly connected to the top of both sides of the support plate 42, and a seventh cylinder 44 is fixedly connected to the top of the second columns 43. There are four second columns 43 in total, arranged in a rectangular pattern, providing a stable mounting base for the seventh cylinders 44 fixedly connected to the top; a second movable plate 45 is movably sleeved on the second columns 43, and the output end of the seventh cylinder 44 is fixedly connected to the top surface of the second movable plate 45; a sixth cylinder 423 is fixedly mounted on the side of the slide rail 4, and its output end is fixedly connected to the support plate 42 for driving. The moving support plate 42 moves along the slide rail 4; the second drive assembly includes a mounting block 41, the top of which is fixedly connected to a first column 411; the top of the first column 411 is fixedly connected to a fourth cylinder 412, there are four first columns 411 in total and they are arranged in a rectangular shape, providing a stable mounting base for the fourth cylinder 412 fixedly connected to the top, a first movable plate 413 is movably sleeved on the first column 411, the output end of the fourth cylinder 412 is fixedly connected to the first movable plate 413, the mounting block 41 is slidably mounted on the slide rail 4, and a fifth cylinder 414 is fixedly mounted on the slide rail 4, the output end of which is fixedly connected to the mounting block 41.

[0035] Specifically, the motion assembly includes a ninth cylinder 64 and a movable frame 6. The bottom of the support plate 42 is provided with a horizontal mounting hole 422. The movable frame 6 is movably inserted into the bottom of the support plate 42 through the mounting hole 422. The ninth cylinder 64 is fixedly installed at the bottom of the support plate 42, and its output end is fixedly connected to the movable frame 6. An inclined push plate 61 is provided on one side of the movable frame 6. The push plate 61 abuts against the push rod 63 so that when the movable frame 6 moves horizontally, the push rod 63 is driven to move vertically through the inclined plane transmission.

[0036] Before the welding work begins, the operator places multiple steel trusses on the surface of the base plate according to the preset positions, and then starts the first roller conveyor 11 to drive the steel trusses and the base plate to move synchronously. When the end face of the base plate contacts the stop plate 62, the workpiece is obstructed and stops moving. At this time, the first roller conveyor 11 automatically shuts down. Then the lifting assembly starts, driving the pressure frame 32 to move vertically downward. During the downward movement, the support plates 33 arranged in an inverted V shape on both sides of the bottom of the pressure frame 32 guide and position the steel trusses, correcting their placement deviations to ensure accurate positioning. As the pressure frame 32 continues to move downward, the distance between the pressure plate 34 and the base plate gradually decreases, eventually pressing and fixing the steel trusses onto the base plate.

[0037] Next, the sixth cylinder 423 and the motor 23 start synchronously. The sixth cylinder 423 drives the support plate 42 to move along the slide rail 4, and the motor 23 drives the movable frame 3 to slide along the crossbar 22 through the lead screw 21. The two work together to make the support plate 42 and the movable frame 3 move synchronously towards the machine frame 1, thereby driving the workpiece after positioning and clamping to move smoothly and effectively avoiding relative displacement during the transfer process. After completing a preset displacement, the lifting component drives the pressure frame 32 to move up and reset, releasing the clamping of the workpiece; then the sixth cylinder 423 and the motor 23 move in opposite directions, driving the support plate 42 and the movable frame 3 back to the initial position, repeating the above "positioning-clamping-transfer" action until the workpiece accurately arrives at the welding station, and the welding operation can be started. After the initial welding and fixing are completed, motor 23 drives screw 21 to rotate, moving movable frame 3 to the side of fixed frame 2 away from frame 1. The subsequent transfer of the steel truss and base plate is completed collaboratively by sixth cylinder 423 and seventh cylinder 44, while pressure frame 32 moves up and down in an orderly manner under the drive of the lifting assembly, reliably limiting the steel truss in the unwelded area during welding to prevent displacement due to welding vibration or transport inertia. No manual assistance is required in the initial welding stage, resulting in a high degree of automation. This significantly improves production efficiency while ensuring the alignment accuracy of welding nodes and the quality of welds. Compared to the traditional step-by-step process of "workpiece transfer → positioning → welding," where the workpiece may experience significant displacement during transfer, positioning is difficult, and subsequent welding requires positioning before welding, leading to lower overall efficiency, this structure effectively avoids significant displacement during workpiece transfer, thus reducing the difficulty of positioning. Furthermore, during subsequent welding, positioning and welding processes can be implemented simultaneously, significantly improving the continuity of the entire welding process and greatly increasing welding efficiency. In addition, after the steel truss and the base plate are positioned in the initial stage, the positioning structure and the conveying structure move synchronously. During this process, after the steel truss and the base plate are initially positioned, the positioning structure and the conveying structure move synchronously. During this process, the workpiece is in a continuous positioning state, which effectively prevents the occurrence of secondary offset, thereby ensuring the stability and reliability of positioning accuracy.

[0038] Additionally, refer to Figure 3 , Figure 4 , Figure 8 and Figure 9 A connecting arm 35 is provided on the side of the pressure frame 32 near the first roller conveyor 11. The bottom of the connecting arm 35 is provided with a limiting member 351 with an inverted V-shaped structure, the shape of which is consistent with the support plate 33. A third cylinder 352 is mounted on the movable frame 3, and the output end of the third cylinder 352 is fixedly connected to the connecting arm 35. A plug rod 353 is fixedly connected on the side of the connecting arm 35 near the pressure frame 32. A fixing plate 322 is provided between the pressure frame 32 and the support plate 33. The plug rod 353 passes through the fixing plate 322 and slides with it.

[0039] Driven by the third cylinder 352, the limiting member 351 can move laterally closer to or further away from the pressure frame 32. When the limiting member 351 is close to the pressure frame 32, it forms a positioning structure together with the support plate 33, which increases the contact area with the steel truss and improves positioning stability. After the initial positioning of the steel truss is completed, the limiting member 351 moves away from the frame 1, which helps to straighten the steel truss and prevents its tail from tilting, further optimizing the limiting effect. At the same time, during the subsequent welding process, the limiting member 351 maintains a preset distance from the pressure frame 32, which can expand the contact limiting range of the steel truss and ensure its overall positioning accuracy, laying a stable and reliable foundation for the subsequent welding process.

[0040] Reference Figure 1 , Figure 2 and Figure 3 A support frame 5 is provided on the side of the fixed frame 2 near the first roller conveyor 11. A lifting plate 51 is provided above the support frame 5. Insert plates 511 are fixedly connected to both sides of the bottom of the lifting plate 51. The insert plates 511 are movably inserted into the pre-set through holes at the top of the support frame 5. An eighth cylinder 52 is fixedly mounted on the support frame 5. Its output end is fixedly connected to the bottom surface of the lifting plate 51 and is used to drive the lifting plate 51 to achieve vertical lifting.

[0041] The steel truss consists of an upper chord, a lower chord, and web members, which are welded together using resistance spot welding to form a stable triangular truss unit. The bottom of the web members is a bent triangular structure. During manufacturing, the bent area at the bottom of the web members is susceptible to flatness deviations due to handling and placement. When welded to the base plate, this unevenness not only reduces the actual contact area, leading to insufficient weld strength, but may also cause elastic deformation under welding pressure. After welding is completed and the pressure is released, the deformed structure will elastically rebound, affecting the weld formation quality and connection stability. Therefore, during subsequent welding, the lifting assembly moves the pressure frame 32 and pressure plate 34 downwards, cooperating with the lifting plate 51 driven upwards by the eighth cylinder 52 to level the bent area at the bottom of the web members, maintaining a flat and fitted state. This effectively increases the welding contact area and suppresses displacement caused by structural deformation during welding, ensuring stable weld quality.

[0042] Reference Figure 5 and Figure 7 Both the mounting block 41 and the bearing plate 42 are equipped with rollers 421, which are adapted to the slide rail 4.

[0043] The roller 421 replaces the mounting block 41 and the bearing plate 42, which are in direct contact with the slide rail 4. This can convert sliding friction into rolling friction, making the movement of both along the slide rail 4 smoother and more stable. It can also reduce wear on the contact surface and effectively extend the service life of the components.

[0044] The implementation principle of the precast floor slab truss welding device in this application is as follows: After multiple steel trusses are placed on the base plate surface at preset positions using hoisting equipment, the first roller conveyor 11 starts, driving the base plate and steel trusses to move synchronously towards the positioning area. In the initial state, the ninth cylinder 64 is in the retracted state, the push plate 61 pushes the push rod 63 upward, and the stop plate 62 is higher than the bearing plate 42. When the end face of the base plate contacts the stop plate 62, the workpiece stops moving due to the restricted position, and the first roller conveyor 11 stops moving.

[0045] Subsequently, the second cylinder 31 drives the pressure frame 32 to move vertically downwards. The inverted V-shaped support plate 33 on the inner side of the pressure frame 32 guides and corrects the steel truss, correcting positional deviations. As the pressure frame 32 continues to move downwards, the distance between the pressure plate 34 and the bearing plate 42 decreases, firmly pressing the steel truss onto the base plate. At the same time, the limiting member 351 presses against the pressure frame 32, increasing the contact area with the steel truss to improve positioning stability. When the steel truss and the base plate are about to be pressed together, the third cylinder 352 drives the limiting member 351 to move away from the frame 1, straightening the rear of the steel truss and preventing it from tilting.

[0046] After positioning is complete, the ninth cylinder 64 drives the push plate 61 to move, and the push rod 63 moves downward under its own weight, so that the stop plate 62 is lower than the upper surface of the bearing plate 42, releasing the obstruction and limitation on the bottom plate. The seventh cylinder 44 drives the second movable plate 45 to move downward, so that it cooperates with the bearing plate 42 to clamp and fix the bottom plate. Then the motor 23 drives the lead screw 21 to rotate, which, in conjunction with the guide bar 22, drives the movable frame 3 and related components to move horizontally; at the same time, the sixth cylinder 423 pushes the bearing plate 42 to move along the slide rail 4. The two work together to realize that the movable frame 3 and the bearing plate 42 move synchronously towards the frame 1, thereby driving the steel truss and the bottom plate after positioning and clamping to move smoothly. After completing a preset displacement, the lifting component drives the pressure frame 32 to move upward and reset, and the movable frame 3 and the bearing plate 42 return to the initial position, repeating the "positioning-clamping-transfer" cycle until the workpiece accurately arrives at the welding station. The movable frame 3 then moves to the side away from the frame 1, so that the position of the pressure frame 32 corresponds to that of the lifting plate 51; the subsequent transfer of the steel truss and the bottom plate is completed by the sixth cylinder 423 and the seventh cylinder 44 working together.

[0047] During welding, the first cylinder 13 drives the upper electrode seat 131 to move downwards, and the upper electrode block 132 cooperates with the corresponding lower electrode block 141 to press the triangular node area between the web member of the steel truss and the base plate and complete the resistance spot welding. During this process, the pressure frame 32 is intermittently pressed down under the drive of the lifting assembly to continuously limit the steel truss in the unwelded area. At the same time, the eighth cylinder 52 on the support frame 5 drives the lifting plate 51 to move upwards, which cooperates with the pressing plate 34 to level the bending area at the bottom of the web member, reduce the flatness deviation of the bending area at the bottom of the web member, ensure sufficient welding contact area, and avoid elastic rebound affecting the welding quality.

[0048] After the steel truss and the base plate are all welded, the fourth cylinder 412 drives the first movable plate 413 to move down, and the base plate is clamped by the first movable plate 413 and the mounting block 41. Then the fifth cylinder 414 pushes the mounting block 41 to move along the slide rail 4, transferring the steel truss and the base plate to the second roller conveyor 12. The second roller conveyor 12 is started, and the formed steel truss and the base plate are transferred as a whole to the subsequent process area.

[0049] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A welding device for precast floor slab trusses, comprising a frame (1), a first roller conveyor (11) disposed on one side of the frame (1), a second roller conveyor (12) disposed on the other side, and a plurality of welding components mounted on the frame (1), characterized in that: A fixed frame (2) is provided between the first roller conveyor (11) and the second roller conveyor (12). A movable frame (3) is slidably mounted on the fixed frame (2). A displacement component for driving the movable frame (3) to move left and right is also provided on the fixed frame (2). Multiple lifting components are provided on the movable frame (3). The output end of each lifting component is connected to a pressure frame (32). Pressure plates (34) are provided on both sides of the bottom of the pressure frame (32). Two sets of symmetrically distributed support plates (33) are provided on the inner side of the pressure frame (32). The two sets of support plates (33) together form an inverted V-shaped structure. The second roller conveyor (12) is provided with slide rails (4) on both sides. The slide rail (4) is slidably fitted with a first drive assembly on the side near the fixed frame (2). The first drive assembly and the displacement assembly move synchronously to drive the truss and the base plate to be transported synchronously. The slide rail (4) is provided with a second drive assembly on the side near the frame (1) to drive the welded truss and the base plate to be transported along the second roller conveyor (12). The first drive assembly is provided with a push rod (63) and a motion assembly that pushes the push rod (63) to move vertically. The top of the push rod (63) is provided with a stop plate (62) for positioning the truss and the base plate. A connecting arm (35) is provided on the side of the pressure frame (32) near the first roller conveyor (11), and a limiting member (351) with an inverted V-shaped structure is provided at the bottom of the connecting arm (35); a third cylinder (352) is mounted on the movable frame (3), and the output end of the third cylinder (352) is fixedly connected to the connecting arm (35); a plug rod (353) is fixed on the side of the connecting arm (35) near the pressure frame (32), and a fixing plate (322) is provided between the pressure frame (32) and the support plate (33), and the plug rod (353) passes through the fixing plate (322) and is slidably connected to it; The first drive assembly includes a support plate (42), with both ends of the support plate (42) slidably mounted on corresponding slide rails (4); a second column (43) is fixedly connected to the top of both sides of the support plate (42), and a seventh cylinder (44) is fixedly connected to the top of the second column (43). A second movable plate (45) is movably mounted on the second column (43), and the output end of the seventh cylinder (44) is fixedly connected to the top surface of the second movable plate (45). A sixth cylinder (423) is fixedly mounted on the slide rail (4), and its output end is fixedly connected to the support plate (42). Fixed connection; the second drive component includes a mounting block (41), the top of the mounting block (41) is fixedly connected to a first column (411), the top of the first column (411) is fixedly connected to a fourth cylinder (412), a first movable plate (413) is movably sleeved on the first column (411), the output end of the fourth cylinder (412) is fixedly connected to the first movable plate (413), the mounting block (41) is slidably mounted on a slide rail (4), a fifth cylinder (414) is fixedly mounted on the slide rail (4), and its output end is fixedly connected to the mounting block (41); The coordinated cooperation between the limiting component (351) and the support plate (33) can increase the contact area with the steel truss, improve the stability of the limiting support, and help the steel truss to return to its position quickly; the limiting component (351) moves backward of the steel truss to correct and align the rear end of the steel truss, so that the entire steel truss always maintains a precise posture. The movable frame (3) and the bearing plate (42) move synchronously toward the machine frame (1), thereby driving the steel truss and the bottom plate after positioning and clamping to move smoothly; The pressure frame (32) moves vertically downward, and the support plate (33) arranged in an inverted V shape on the inner side of the pressure frame (32) guides and corrects the steel truss, correcting the positional deviation. As the pressure frame (32) continues to move downward, the distance between the pressure plate (34) and the bearing plate (42) decreases, firmly pressing the steel truss onto the bottom plate. At the same time, the limiting member (351) is close to the pressure frame (32), increasing the contact area with the steel truss to improve positioning stability. When the steel truss and the bottom plate are about to be pressed together, the third cylinder (352) drives the limiting member (351) to move away from the frame (1), straightening the rear of the steel truss and preventing it from tilting.

2. The precast floor slab truss welding device according to claim 1, characterized in that: The fixed frame (2) is provided with a support frame (5) on the side near the first roller conveyor (11).

3. The precast floor slab truss welding device according to claim 2, characterized in that: A lifting plate (51) is provided above the support frame (5). Insert plates (511) are fixedly connected to both sides of the bottom of the lifting plate (51). The insert plates (511) are movably inserted into the top of the support frame (5). An eighth cylinder (52) is fixedly mounted on the support frame (5). The output end of the eighth cylinder (52) is fixedly connected to the bottom surface of the lifting plate (51).

4. The precast floor slab truss welding device according to claim 1, characterized in that: Both the mounting block (41) and the bearing plate (42) are equipped with rollers (421), which are adapted to the slide rail (4).

5. The precast floor slab truss welding device according to claim 1, characterized in that: The lifting assembly includes a second cylinder (31), a connecting rod (321), and a sleeve (36). The second cylinder (31) and the sleeve (36) are both fixedly installed on the movable frame (3). The output end of the second cylinder (31) and the bottom end of the connecting rod (321) are both fixedly connected to the pressure frame (32). The connecting rod (321) is movably sleeved inside the sleeve (36).

6. The precast floor slab truss welding device according to claim 1, characterized in that: The displacement assembly includes a lead screw (21), a crossbar (22), and a motor (23). The lead screw (21) is rotatably connected to the top of the fixed frame (2). The crossbar (22) is fixed on the fixed frame (2) and located below the lead screw (21). The output end of the motor (23) is fixedly connected to the lead screw (21). The movable frame (3) is threadedly connected to the lead screw (21) and slidably connected to the crossbar (22).

7. The precast floor slab truss welding device according to claim 1, characterized in that: The motion assembly includes a ninth cylinder (64) and a moving frame (6). The bottom of the support plate (42) is provided with a mounting hole (422). The moving frame (6) is movably disposed below the support plate (42) through the mounting hole (422). The ninth cylinder (64) is fixedly installed at the bottom of the support plate (42), and its output end is fixedly connected to the moving frame (6). A push plate (61) is provided on one side of the moving frame (6). The push plate (61) abuts against the push rod (63) to drive the push rod (63) to move vertically when the moving frame (6) moves horizontally.

8. The precast floor slab truss welding device according to claim 1, characterized in that: The welding assembly includes a first cylinder (13) and a horizontal plate (14). The output end of the first cylinder (13) is fixedly connected to an upper electrode seat (131). The bottom of the upper electrode seat (131) is fixedly connected to an upper electrode block (132). The upper surface of the horizontal plate (14) is fixedly connected to a lower electrode block (141) that cooperates with the upper electrode block (132).

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