Road and bridge planning steel structure bridge prefabricated part machining and welding device and technology

Abstract

The invention relates to the technical field of bridge prefabricated part machining, in particular to a road and bridge planning steel structure bridge prefabricated part machining and welding device which comprises a welding platform and a base plate, and the base plate is installed on the upper surface of the welding platform and used for placing a steel plate. A plurality of first positioning blind holes are formed in the diagonal line of the upper surface of the base plate from left to right at equal intervals, limiting blocks are inserted into inner cavities of the first positioning blind holes, the inner cavities of the first positioning blind holes are rectangular, and the limiting blocks are prevented from rotating. A support is installed on the upper surface of the welding platform, and two hydraulic oil cylinders are installed on the left side of the top of the support. A positioning mechanism is installed at the output end of the hydraulic oil cylinder. The problem that in a traditional technology, the quality of embedded parts is poor is fundamentally solved, the position adjusting difficulty during follow-up pier installation is greatly reduced, hidden dangers such as too large assembly gaps and uneven stress caused by inclination and deviation of anchoring ribs can be avoided, and reliable guarantee is provided for long-term service safety of the whole bridge structure.

Description

Technical Field

[0001] This invention relates to the field of bridge prefabrication processing technology, specifically to a welding device and process for processing prefabricated steel structure bridge components for road and bridge planning. Background Technology

[0002] Bridge embedded components, as key components in steel structure bridge construction, have the core function of being pre-installed within concealed works and simultaneously placed during the structural pouring stage. They are primarily used for pier splicing operations and provide stable support for the installation and fixation of external engineering equipment foundations. They are crucial fundamental components ensuring the overall structural stability and assembly accuracy of the bridge. Structurally, bridge embedded components typically consist of a steel plate and four anchor bars. These four anchor bars are welded to the steel plate surface according to a rectangular distribution pattern, forming standardized prefabricated components. In this structure, the perpendicularity between the anchor bars and the steel plate is a core indicator determining the performance of the embedded component. This perpendicularity directly affects the fit of the subsequent pier splicing and the structural stress balance, thus having a critical impact on the overall support effect of the piers and the long-term service safety of the bridge.

[0003] In the current processing of bridge embedded parts, the welding and positioning of anchor bars and steel plates still relies mainly on traditional techniques, with two main operating methods: one is manual hand-held positioning welding, where the worker holds the anchor bar with one hand to maintain its position while operating the welding gun with the other; the other is mold-assisted positioning welding, where a customized mold is used to limit and fix the anchor bar before welding. However, both of these traditional positioning methods have significant technical defects, making it difficult to meet the dual requirements of modern steel structure bridges for the processing accuracy and cost control of embedded parts: First, manual hand-held positioning is greatly affected by subjective factors such as the operator's experience and hand stability, which can easily lead to tilting or displacement of the anchor bar, making it impossible to guarantee its perpendicularity to the steel plate and the accuracy of its rectangular distribution. Even with mold positioning, if the mold's processing accuracy is off or it wears out after long-term use, it can still cause inaccurate positioning of the anchor bar. Such precision defects directly lead to substandard quality of embedded parts, not only increasing the difficulty of subsequent adjustments during pier installation, but also potentially creating potential safety hazards to the bridge structure due to excessive assembly gaps and uneven stress.

[0004] Secondly, because different specifications of steel structure bridges have different requirements for the size of embedded parts, when using molds for positioning, a set of customized molds needs to be replaced for each new specification of embedded part. Frequent mold replacements not only increase the direct costs of mold design and manufacturing, but also lead to interruptions in processing procedures and reduced production efficiency. This is especially detrimental to the flexible processing of small batches of embedded parts of various specifications, making it difficult to meet the diverse prefabricated component needs in modern bridge engineering. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of poor welding quality of existing embedded parts and the inability to process embedded parts of various specifications.

[0006] This invention achieves the above-mentioned objectives through the following technical solution: a welding device for processing prefabricated steel structure bridge components for road and bridge planning, comprising a welding platform and a pad. The pad is installed on the upper surface of the welding platform and is used for placing steel plates. A plurality of first positioning blind holes are equally spaced diagonally from left to right on the upper surface of the pad. Limiting blocks are inserted into the inner cavity of the first positioning blind holes. The inner cavity of the first positioning blind holes is rectangular to prevent the limiting blocks from rotating. A bracket is installed on the upper surface of the welding platform. Two hydraulic cylinders are installed on the top left side of the bracket. A positioning mechanism is installed at the output end of the hydraulic cylinders. The positioning mechanism grabs the anchor bars and accurately places the anchor bars on the steel plate for pre-welding positioning. A conveying mechanism is installed on the right side wall of the bracket to convey the anchor bars to the anchor bar positioning mechanism. The positioning mechanism includes a top plate installed at the output end of a hydraulic cylinder. A first motor is installed at the center of the upper surface of the top plate. A turntable is installed at the output end of the first motor. Four guide slots are equidistantly arranged on the upper surface of the turntable. The first motor drives the turntable to rotate clockwise or counterclockwise to adjust the position of the guide slots.

[0007] Specifically, the top of the limiting block has a right angle shape.

[0008] Specifically, the four guide grooves are distributed clockwise and obliquely on the upper surface of the turntable.

[0009] Specifically, the positioning mechanism also includes a base installed on the outer edge of the lower surface of the top plate. A transmission component is installed at the center of the bottom of the inner cavity of the base. Slider blocks are inserted around the outer side of the base. The sliders are I-shaped to improve the stability of the slider movement. A pin is installed on the inner side of the upper surface of the slider to be inserted into the inner cavity of the guide groove. A clamping component is installed on the outer side of the slider to grip the anchor bar. A second motor is installed at the center of the lower surface of the base to provide power to the transmission component. The drive assembly, consisting of a first motor, turntable, guide groove, and pin, allows the slider to move and proportionally enlarge or reduce the space formed by the four clamping assemblies, thereby enabling welding of embedded parts of different specifications.

[0010] Specifically, the center lines of all four sliders point towards the transmission assembly.

[0011] Specifically, the transmission assembly includes a quadrilateral mounting base installed at the center of the bottom of the base cavity. Splined shafts are mounted on all four sides of the mounting base via bearings. A driven bevel gear is keyed to the inner side of the splined shaft. An active bevel gear is installed at the output end of the second motor, and the active bevel gear meshes with the driven bevel gear. The rotation of the second motor serves as the power source. Under the transmission conditions of the active bevel gear and the driven bevel gear, the splined shaft drives the clamping assembly to complete the gripping of the anchor bar. Provide driving force to the clamping components so that the four clamping components can clamp and release the anchor bars synchronously.

[0012] Specifically, the clamping assembly includes a box body installed on the outside of the slider. A bushing is installed at the center of the inner side of the box body via a bearing, and the bushing is sleeved on the outer wall of the spline shaft, allowing the bushing and the spline shaft to not only slide against each other but also rotate synchronously. A gear is installed on the outside of the bushing. Two guide rods are installed laterally in the inner cavity of the box body. Clamping plates are sleeved on both sides of the outer wall of the guide rods. A rack that meshes with the gear is installed on the inner side of the clamping plate. Powered by the transmission assembly, the gears rotate, and the two racks move in opposite directions, allowing the clamping plates to clamp and release the anchor bars.

[0013] Specifically, the two clamping plates have anti-slip ridges on their opposite surfaces.

[0014] Specifically, the conveying mechanism includes two linear cylinders installed on the right side wall of the support. A frame is installed at the output end of the linear cylinder. Limiting grooves are opened at the four corners of the upper surface of the frame to limit the anchoring bars. A second positioning blind hole is opened in the inner cavity of the limiting groove. The anchoring bars are inserted into the second positioning blind hole to achieve the purpose of feeding the anchoring bars.

[0015] A process for a welding device for processing prefabricated steel structure bridge components in road and bridge planning includes the following steps: Step 1: Under the limiting action of the limiting block, the steel plate is accurately placed on the pad to position the steel plate; Step 2: Insert the anchor bar into the second positioning blind hole, and place the anchor bar under the limiting groove. Drive the frame to the left by the linear cylinder, and move the anchor bar to the position directly below the positioning mechanism for anchor bar feeding. Step 3: The top plate is moved up and down by the hydraulic cylinder to bring the clamping assembly and the anchoring bar to the same height. The first motor drives the turntable to rotate clockwise, causing the guide groove to press the pin outward, which causes the slider to move the clamping assembly outward, so that the clamping plate reaches the anchoring bar. Then, the second motor drives the active bevel gear and the driven bevel gear to drive the spline shaft to rotate counterclockwise. The two racks move inward at the same time, the clamping plate clamps the anchoring bar, and the hydraulic cylinder drives the clamping plate to rise to grab the anchoring bar. Step 4: After the frame is removed, the first motor drives the turntable to rotate counterclockwise. The guide groove presses the pin inward, allowing the slider to move the anchor bar inward. Adjust the position between the four anchor bars so that the anchor bars are placed vertically on the steel plate. Weld the anchor bars to the steel plate to achieve the welding and forming of the embedded parts. Step 5: Adjust the limiting block according to the specifications of the embedded part to be processed. Insert the limiting block into the first positioning blind hole at the corresponding position to achieve positioning of steel plates of different sizes. The first motor controls the rotation angle of the turntable, and the guide groove drives the slider to move a distance that can be adjusted. Adjust the width between the anchor bars according to the specifications of the embedded part. Therefore, it is possible to position embedded parts of various specifications.

[0016] The beneficial effects of this invention are: 1. This invention provides stable power through a second motor, driving the active and driven bevel gears to precisely mesh and transmit power, causing the spline shaft and bushing to rotate synchronously. As the bushing rotates, the gear on the outside, through meshing with the rack, pulls the two clamping plates to move synchronously outward or inward along the guide rod, achieving stable clamping and release of the anchor bars. This transmission structure provides rigid mechanical constraint throughout, avoiding subjective errors from manual positioning and precision loss due to mold wear. It ensures that the anchor bars are always placed vertically on the steel plate surface, effectively guaranteeing the perpendicularity and rectangular distribution accuracy of the anchor bars and steel plate. This not only fundamentally solves the problem of poor quality of embedded parts in traditional processes and significantly reduces the difficulty of subsequent pier installation position adjustments, but also avoids potential hazards such as excessive assembly gaps and uneven stress caused by tilting or offset of the anchor bars, providing reliable assurance for the long-term service safety of the overall bridge structure.

[0017] 2. This invention relies on a first motor to drive a turntable to rotate clockwise or counterclockwise. The turntable utilizes inclined guide grooves that engage with pins on the slider. As the turntable rotates, the inclined surfaces of the guide grooves exert outward or inward pressure on the pins, causing the slider to move synchronously along the base. This adjusts the spacing between the four clamping components, enabling flexible control of the width between anchor bars. Unlike traditional mold positioning processes, there is no need to replace customized molds for different specifications of embedded parts. Simply adjusting the rotation angle of the first motor is sufficient to accommodate the processing needs of embedded parts with different steel plate sizes and anchor bar spacings. This significantly reduces equipment costs associated with mold design, manufacturing, and replacement, and avoids process interruptions due to mold changes. It effectively improves the equipment's functionality and utilization rate, making it particularly suitable for the flexible processing of small batches of multi-specification embedded parts, meeting the diverse prefabricated component needs of modern bridge engineering.

[0018] 3. This invention establishes a complete automated processing flow for embedded parts through the coordinated operation of a conveying mechanism, a positioning mechanism, and a hydraulic cylinder: the conveying mechanism uses a linear cylinder to drive the frame to move, precisely conveying the anchor bars pre-placed in the second positioning blind hole to the area directly below the positioning mechanism, thus automating the loading process; the positioning mechanism uses the cooperation of transmission and clamping components to grasp the anchor bars, and uses the spacing adjustment function of the guide groove and pin to determine the position of the anchor bars; the hydraulic cylinder drives the overall lifting and lowering of the positioning mechanism, completing the action of the anchor bars from grasping to precise connection with the steel plate. The entire process requires no manual intervention, effectively replacing the inefficient traditional manual loading and hand-held positioning operations, and significantly shortening the processing cycle of embedded parts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the positioning mechanism structure of the present invention; Figure 3 This is an exploded view of the positioning mechanism of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is an exploded view of the clamping component of the present invention; Figure 6 This is a schematic diagram of the conveying mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of section B in the middle.

[0020] In the diagram: 1. Welding platform; 2. Pad; 3. First positioning blind hole; 4. Limiting block; 5. Bracket; 6. Hydraulic cylinder; 7. Positioning mechanism; 8. Conveying mechanism; 71. Top plate; 72. First motor; 73. Turntable; 74. Guide groove; 75. Base; 76. Transmission assembly; 77. Slider; 78. Pin; 79. Clamping assembly; 710. Second motor; 761. Mounting seat; 762. Splined shaft; 763. Driven bevel gear; 764. Driving bevel gear; 791. Box body; 792. Bushing; 793. Gear; 794. Guide rod; 795. Clamping plate; 796. Rack; 81. Linear cylinder; 82. Frame; 83. Limiting groove; 84. Second positioning blind hole. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of the present invention easier to understand, the preferred embodiments of the present invention are further described below in conjunction with specific embodiments and accompanying drawings.

[0022] Please see Figures 1-7This invention provides a welding device for processing prefabricated steel structure bridge components for road and bridge planning, including a welding platform 1 and a pad 2. The pad 2 is installed on the upper surface of the welding platform 1 and is used for placing steel plates. Several first positioning blind holes 3 are equally spaced diagonally from left to right on the upper surface of the pad 2. Limiting blocks 4 are inserted into the inner cavity of the first positioning blind holes 3. The inner cavity of the first positioning blind holes 3 is rectangular to prevent the limiting blocks 4 from rotating. The top of the limiting blocks 4 is right-angled. The rectangular steel plate positioning structure is constructed by four limiting blocks 4. The limiting blocks 4 are inserted into the first positioning blind holes 3 at different positions to realize the positioning of pre-embedded steel plates of various specifications. A bracket 5 is installed on the upper surface of the welding platform 1. Two hydraulic cylinders 6 are installed on the top left side of the bracket 5. A positioning mechanism 7 is installed at the output end of the hydraulic cylinders 6. The positioning mechanism 7 grabs the anchor bar and accurately places the anchor bar on the steel plate for pre-welding positioning. A conveying mechanism 8 is installed on the right side wall of the bracket 5 to convey the anchor bar to the anchor bar positioning mechanism 7.

[0023] The positioning mechanism 7 includes a top plate 71 installed at the output end of the hydraulic cylinder 6. A first motor 72 is installed at the center of the upper surface of the top plate 71. A turntable 73 is installed at the output end of the first motor 72. Four guide grooves 74 are equidistantly opened along the circumference of the upper surface of the turntable 73. The first motor 72 drives the turntable 73 to rotate clockwise or counterclockwise to adjust the position of the guide grooves 74. The four guide grooves 74 are distributed clockwise and obliquely on the upper surface of the turntable 73. The inclined surfaces of the guide grooves 74 can press the pins 78 outward or inward, so that the sliders 77 converge or move away synchronously.

[0024] The first motor 72 is a servo motor, characterized by precise rotation angle and strong anti-interference capability. It is equipped with a driver and an encoder. Under the control of the encoder, the driver drives the first motor 72 to rotate, thereby precisely controlling the rotation angle of the turntable 73.

[0025] As a preferred embodiment, the positioning mechanism 7 further includes a base 75 installed on the outer edge of the lower surface of the top plate 71. A transmission component 76 is installed at the center of the bottom of the inner cavity of the base 75. Slider 77s are inserted into the four sides of the outer wall of the base 75. The slider 77s are I-shaped to improve the stability of the movement of the slider 77s. The center lines of the four sliders 77s all point to the transmission component 76. The sliders 77s move centripetally to ensure that the clamping component 79 is enlarged or reduced proportionally to achieve the welding of various specifications of embedded parts. A pin 78 is installed on the inner side of the upper surface of the slider 77 to be inserted into the inner cavity of the guide groove 74. A clamping component 79 is installed on the outer side of the slider 77 to grip the anchor bar. A second motor 710 is installed at the center of the lower surface of the base 75 to provide power to the transmission component 76. The second motor 710 is a servo motor, equipped with a driver and an encoder. Under the control of the encoder, the driver drives the second motor 710 to rotate at a specified angle.

[0026] As a preferred embodiment, the transmission assembly 76 further includes a quadrilateral mounting base 761 installed at the center of the bottom of the inner cavity of the base 75. Splined shafts 762 are mounted on all four sides of the mounting base 761 via bearings. A driven bevel gear 763 is keyed to the inner side of the splined shaft 762. An active bevel gear 764 is installed at the output end of the second motor 710, and the active bevel gear 764 meshes with the driven bevel gears 763. The rotation of the second motor 710 serves as the power source, enabling the four driven bevel gears 763 to rotate synchronously, allowing the splined shaft 762 to drive the clamping assembly 79 to complete the gripping of the anchoring rib.

[0027] As a preferred embodiment, the clamping assembly 79 further includes a housing 791 mounted on the outside of the slider 77. A bushing 792 is mounted on the center of the inner side of the housing 791 via a bearing, and the bushing 792 is fitted onto the outer wall of the spline shaft 762, allowing the bushing 792 and the spline shaft 762 to not only slide against each other but also rotate synchronously. A gear 793 is mounted on the outside of the bushing 792. Two guide rods 794 are horizontally mounted inside the housing 791. Clamping plates 795 are fitted onto both sides of the outer wall of the guide rods 794. Anti-slip ridges are provided on the opposite surfaces of the two clamping plates 795 to prevent slippage when clamping the anchoring bars and to avoid changes in the angle of the anchoring bars. The guide rods 794 constrain the horizontal linear movement of the clamping plates 795. A rack 796 that meshes with the gear 793 is mounted on the inner side of the clamping plates 795. The two racks 796 are vertically opposite each other, and when the two racks 796 move in opposite directions, the two clamping plates 795 can move inward or outward simultaneously.

[0028] As a preferred embodiment, the conveying mechanism 8 further includes two linear cylinders 81 installed on the right side wall of the support 5. A frame 82 is installed at the output end of the linear cylinder 81. The frame 82 moves left and right under the drive of the linear cylinder 81 to perform the feeding operation. Limiting grooves 83 are opened at the four corners of the upper surface of the frame 82 to limit the anchoring bars. A second positioning blind hole 84 is opened in the inner cavity of the limiting groove 83. The anchoring bars are inserted into the second positioning blind hole 84 to achieve the purpose of feeding the anchoring bars. During the welding of the anchor bar to the steel plate, the anchor bar is inserted into the second positioning blind hole 84, making reasonable use of time and further improving processing efficiency.

[0029] Working principle: Step 1: Under the limiting action of the limiting block 4, the steel plate is accurately placed on the pad 2 to position the steel plate. Step 2: Insert the anchor bar into the second positioning blind hole 84, and under the limiting condition of the anchor bar in the limiting groove 83, place the anchor bar. Drive the frame 82 to the left by the linear cylinder 81, and move the anchor bar to the position mechanism 7 for anchor bar feeding. Step 3: The top plate 71 is driven up and down by the hydraulic cylinder 6, so that the clamping assembly 79 and the anchoring bar are at the same height. The first motor 72 drives the turntable 73 to rotate clockwise, so that the guide groove 74 presses the pin 78 outward, causing the slider 77 to move the clamping assembly 79 outward, so that the clamping plate 795 reaches the anchoring bar. Then, the second motor 710 drives the active bevel gear 764 and the driven bevel gear 763 to drive the spline shaft 762 to drive the gear 793 to rotate counterclockwise. The two racks 796 move inward at the same time, the clamping plate 795 clamps the anchoring bar, and the hydraulic cylinder 6 drives the clamping plate 795 to rise, so as to grab the anchoring bar. Step 4: After the frame 82 is removed, the first motor 72 drives the turntable 73 to rotate counterclockwise. The guide groove 74 presses the pin 78 inward, allowing the slider 77 to move the anchor bar inward. Adjust the position between the four anchor bars so that the anchor bars are placed vertically on the steel plate. Weld the anchor bars to the steel plate to achieve the welding and forming of the embedded parts. Step 5: Adjust the limiting block 4 according to the specifications of the embedded parts to be processed. Insert the limiting block 4 into the first positioning blind hole 3 at the corresponding position to achieve the positioning of steel plates of different sizes. The first motor 72 controls the rotation angle of the turntable 73, and the guide groove 74 drives the slider 77 to move a distance that is controlled. Adjust the width between the anchor bars according to the specifications of the embedded parts. Therefore, the positioning of embedded parts of various specifications can be achieved.

[0030] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A welding device for processing prefabricated steel structure bridge components for road and bridge planning, comprising a welding platform (1) and a pad (2), wherein the pad (2) is installed on the upper surface of the welding platform (1) and is used for placing steel plates, characterized in that, The upper surface of the pad (2) is provided with several first positioning blind holes (3) at equal intervals from left to right along the diagonal. The inner cavity of the first positioning blind hole (3) is fitted with a limit block (4). The inner cavity of the first positioning blind hole (3) is rectangular to prevent the limit block (4) from rotating. The upper surface of the welding platform (1) is equipped with a bracket (5). Two hydraulic cylinders (6) are installed on the top left side of the bracket (5). The output end of the hydraulic cylinder (6) is equipped with a positioning mechanism (7). The positioning mechanism (7) grabs the anchor bar and accurately places the anchor bar on the steel plate for pre-welding positioning. The right side wall of the bracket (5) is equipped with a conveying mechanism (8) to convey the anchor bar to the anchor bar positioning mechanism (7). The positioning mechanism (7) includes a top plate (71) installed at the output end of the hydraulic cylinder (6). A first motor (72) is installed at the center of the upper surface of the top plate (71). A turntable (73) is installed at the output end of the first motor (72). Four guide grooves (74) are equidistantly provided on the upper surface of the turntable (73) along the circumference. The first motor (72) drives the turntable (73) to rotate clockwise or counterclockwise to adjust the position of the guide grooves (74).

2. The prefabrication and welding device for steel structure bridge precast components according to claim 1, characterized in that, The top of the limiting block (4) is a right angle.

3. The prefabrication and welding device for steel structure bridge precast components according to claim 2, characterized in that, The four guide grooves (74) are distributed clockwise and obliquely on the upper surface of the turntable (73).

4. The prefabrication and welding device for steel structure bridge precast components according to claim 3, characterized in that, The positioning mechanism (7) also includes a base (75) installed on the outer edge of the lower surface of the top plate (71). A transmission component (76) is installed at the center of the bottom of the inner cavity of the base (75). Slider (77) is inserted around the outer side of the base (75). The slider (77) is I-shaped to improve the movement stability of the slider (77). A pin (78) is installed on the inner side of the upper surface of the slider (77) and inserted into the inner cavity of the guide groove (74). A clamping component (79) is installed on the outer side of the slider (77) to grip the anchor bar. A second motor (710) is installed at the center of the lower surface of the base (75) to provide power to the transmission component (76).

5. The prefabrication and welding device for steel structure bridge precast components according to claim 4, characterized in that, The center lines of all four sliders (77) point to the transmission assembly (76).

6. The prefabrication and welding device for steel structure bridge precast components according to claim 5, characterized in that, The transmission assembly (76) includes a quadrilateral mounting base (761) installed at the center of the bottom of the inner cavity of the base (75). Splined shafts (762) are mounted on all four sides of the mounting base (761) via bearings. A driven bevel gear (763) is keyed to the inner side of the splined shaft (762). An active bevel gear (764) is installed at the output end of the second motor (710), and the active bevel gear (764) meshes with the driven bevel gear (763). The rotation of the second motor (710) serves as the power source. Under the transmission conditions of the active bevel gear (764) and the driven bevel gear (763), the splined shaft (762) drives the clamping assembly (79) to complete the gripping of the anchor bar.

7. The prefabrication and welding device for steel structure bridge precast components according to claim 8, characterized in that, The clamping assembly (79) includes a box (791) installed on the outside of the slider (77). A bushing (792) is installed at the center of the inner side of the box (791) via a bearing. The bushing (792) is sleeved on the outer wall of the spline shaft (762), allowing the bushing (792) and the spline shaft (762) to not only slide against each other but also rotate synchronously. A gear (793) is installed on the outside of the bushing (792). Two guide rods (794) are installed laterally in the inner cavity of the box (791). Clamping plates (795) are sleeved on both sides of the outer wall of the guide rods (794). A rack (796) that meshes with the gear (793) is installed on the inner side of the clamping plate (795).

8. The prefabrication and welding device for steel structure bridge precast components according to claim 7, characterized in that, The two clamps (795) have anti-slip ridges on their opposite surfaces.

9. A prefabrication and welding device for steel structure bridge precast components according to claim 8, characterized in that, The conveying mechanism (8) includes two linear cylinders (81) installed on the right side wall of the support (5). A frame (82) is installed at the output end of the linear cylinder (81). Limiting grooves (83) are opened at the four corners of the upper surface of the frame (82) to limit the anchoring bars. A second positioning blind hole (84) is opened in the inner cavity of the limiting groove (83). The anchoring bars are inserted into the second positioning blind hole (84) to achieve the purpose of feeding the anchoring bars.

10. A processing technology for prefabricated steel structure bridge components for road and bridge planning, applied in a welding device for processing prefabricated steel structure bridge components for road and bridge planning as described in claim 9, characterized in that, Includes the following steps: Step 1: Under the limiting action of the limiting block (4), the steel plate is accurately placed on the pad (2) to position the steel plate; Step 2: Insert the anchor bar into the second positioning blind hole (84), and under the limiting condition of the anchor bar in the limiting groove (83), place the anchor bar. Drive the frame (82) to the left by the linear cylinder (81), and move the anchor bar to the position mechanism (7) directly below for anchor bar feeding. Step 3: The top plate (71) is driven up and down by the hydraulic cylinder (6) so that the clamping assembly (79) and the anchor bar are at the same height. The first motor (72) drives the turntable (73) to rotate clockwise, so that the guide groove (74) presses the pin (78) outward, causing the slider (77) to drive the clamping assembly (79) to move outward, so that the clamping plate (795) reaches the anchor bar. Then, the second motor (710) drives the active bevel gear (764) and the driven bevel gear (763) to drive the spline shaft (762) to drive the gear (793) to rotate counterclockwise. The two racks (796) move inward at the same time, the clamping plate (795) clamps the anchor bar, and the hydraulic cylinder (6) drives the clamping plate (795) to rise to grab the anchor bar. Step 4: After the frame (82) is removed, the first motor (72) drives the turntable (73) to rotate counterclockwise, the guide groove (74) presses the pin (78) inward, and the slider (77) drives the anchor bar to move inward. Adjust the position between the four anchor bars so that the anchor bars are placed vertically on the steel plate. Weld the anchor bars to the steel plate to realize the welding of the embedded parts. Step 5: Adjust the limiting block (4) according to the specifications of the embedded parts to be processed. Insert the limiting block (4) into the first positioning blind hole (3) at the corresponding position to realize the positioning of steel plates of different sizes. The first motor (72) controls the rotation angle of the turntable (73). The guide groove (74) drives the slider (77) to move a distance that is controlled. Adjust the width between the anchor bars according to the specifications of the embedded parts. Therefore, the positioning of embedded parts of various specifications can be realized.

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