A high-frequency brazing-based hot-rolled rib steel bar butt welding device and a use method thereof

Abstract

The application provides a hot-rolled rib steel bar butt welding device based on high-frequency brazing and a use method, which comprises multiple guide wheel groups arranged on a support frame in a transverse direction, the steel bar moves against the multiple guide wheel groups, and a cutting device, a rotating mechanism, a high-frequency brazing device and a hydraulic pushing device are sequentially arranged on one side of the multiple guide wheel groups; the two ends of the butt joint steel bar are cut off by a saw blade of the cutting device and are conveyed into the high-frequency brazing device, the steel bar specification is automatically identified and the corresponding welding parameters are adapted, and the butt end face is polished, heated, upset and rotated to complete butt joint in a carbon dioxide environment. The application has the advantages of simple structure, high automation degree, realization of unmanned steel bar butt welding processing, stable welding joint quality, small impact on the power grid, no splashing, replacement of resistance butt welding, flame brazing and flash butt welding processes in traditional steel bar butt welding and solution to the problems of slag inclusion, hollow and low strength in other steel bar butt joints based on high-frequency welding.

Description

Technical Field

[0001] This invention relates to the technical field of butt welding of reinforcing bars, and specifically to a butt welding device and method for hot-rolled ribbed reinforcing bars based on high-frequency brazing. Background Technology

[0002] Currently, gas pressure welding and resistance welding, among the methods for butt welding rebar, suffer from uneven heating and oxide buildup on the extruded surface, resulting in unstable joint quality and difficulty in meeting the performance requirements of the base material. The use of gas pressure welding and resistance welding processes is facing restrictions and eventual elimination. However, rebar lengths are generally 9 or 12 meters. For bridge construction, which often involves manufacturing rebar units with lengths of 7-12 meters, butt welding with 6-meter rebar and excess material can effectively reduce material waste, and there is still a demand for this method. Summary of the Invention

[0003] The main objective of this invention is to provide a hot-rolled ribbed steel bar butt welding device and its usage method based on high-frequency brazing, thereby solving the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: multiple guide wheel groups are arranged horizontally on the support frame, the steel bars move against the multiple guide wheel groups, and a cutting device, a rotating mechanism, a high-frequency brazing device and a hydraulic pushing device are arranged sequentially on one side of the multiple guide wheel groups. The cutting device includes a saw blade, a stop block, and a first clamp. The stop block and the first clamp are located on both sides of the saw blade. During cutting, the two ends of the steel bar abut against the stop blocks on both sides and are fixed by the first clamp. The saw blade then cuts the two ends of the steel bar. The high-frequency brazing apparatus includes a housing, a high-frequency heater, and a circumferential heater. The high-frequency heater is located on both sides of the circumferential heater. The housing is filled with carbon dioxide gas. The ends of the two steel bars are located inside the high-frequency heater, and the circumferential heater is located on the end faces of the two steel bars. The rotating mechanism and the hydraulic pushing device are located on both sides of the high-frequency brazing device. The rotating mechanism is used to drive the next steel bar to rotate, and the hydraulic pushing device is used to drive the previous steel bar to move, so that the two steel bars are up-forged and rotated to complete the butt joint.

[0005] Preferably, a guide groove is fixed at the end of the support frame, and a drive mechanism is provided on the guide wheel assembly to drive the V-shaped guide wheel in the guide wheel assembly to rotate, and the steel bar moves against the guide wheel assembly.

[0006] Preferably, the cutting device is located between two guide wheel groups, the cutting drive box in the cutting device is fixed on the support frame, and a first push rod is provided between the cutting drive box and the first clamp. The first push rod is used to drive the first clamp to clamp the steel bar. The cutting device is used to drive the saw blade to move back and forth and up and down rapidly, thereby cutting the ends of the reinforcing bars.

[0007] Preferably, the support frame has an opening, and fixed plates are fixed on both sides of the opening, with the stop block sliding against the fixed plates; The blocks move along the slide rails on both sides via sliding grooves, and the slide rails are fixed to the fixed plate; A second push rod is provided between the fixed plate and the stop block, and the second push rod is used to drive the stop block to move.

[0008] Preferably, a receiving bucket is fixed below the opening of the support frame, and the receiving bucket is used to collect the cut steel bar ends.

[0009] Preferably, a carbon dioxide cylinder is provided on one side of the high-frequency brazing device, the carbon dioxide cylinder is connected to the shell, the high-frequency heater is coaxially arranged with the moving steel bar on the guide wheel assembly, and the circumferential heater is located between the two high-frequency heaters and is used for heating the end faces of the two steel bars. The circumferential heater is connected to the housing on both sides via a fourth push rod, thereby driving the circumferential heater to move via the fourth push rod.

[0010] Preferably, the rotating mechanism includes a rotating drive box, a conical cylinder, and an extrusion cylinder. The extrusion cylinder is sleeved on the end of the conical cylinder. A third push rod is provided between the extrusion cylinder and the conical cylinder. The extrusion cylinder and the conical cylinder are driven to move relative to each other through the third push rod, so that the extrusion cylinder locks the reinforcing bar. The rotating drive box is used to drive the conical cylinder to rotate.

[0011] Preferably, a fixed seat is fixed on one side of the rotary drive box, the end of the conical cylinder abuts against the fixed seat and rotates through a bearing seat, and a driven wheel is fixed on the end of the conical cylinder, which is connected to the motor in the rotary drive box through a belt; The conical cylinder has multiple openings on its periphery. Inside the extrusion cylinder is a rotating conical wedge that fits onto the conical cylinder. The extrusion cylinder is moved by a third push rod, which causes the conical wedge to compress the conical cylinder and lock the reinforcing bar.

[0012] Preferably, the hydraulic pushing device includes a hydraulic push rod, a sliding plate, and a second clamp. The sliding plate slides against the support frame via a sliding assembly. The hydraulic push rod is fixed on the support frame and is used to drive the sliding plate to move. The second clamp is provided on the sliding plate, and a fifth push rod is provided on the sliding plate to drive the second clamp to clamp the reinforcing bar.

[0013] The method is as follows: S1. The reinforcing bar is put into the guide groove and driven to move by the guide wheel group. First, it passes through the cutting device. After the reinforcing bar moves to the front end of the cutting device, the rear end block is lifted by the second push rod, and the reinforcing bar is driven to move in the opposite direction so that the end of the reinforcing bar abuts against the block. The first clamp is then pushed by the first push rod to clamp the reinforcing bar. Then, the saw blade is driven by the cutting device to cut the rear end of the reinforcing bar. S2. After the first rebar is cut, continue to move forward to the hydraulic pushing device, and then put the second rebar into the guide groove. The front end block is lifted by the second push rod. The front end of the second rebar moves against the block and is locked by the first clamp. The saw blade is driven by the cutting device to cut the front end of the rebar. Then the rebar is driven to move and the rear end of the second rebar is cut in step S1. S3. The circumferential heater in the high-frequency brazing device is driven out by the fourth push rod, and drives the first and second steel bars to move and abut against the two sides of the circumferential heater. The two steel bars are locked by the rotating mechanism and the hydraulic pushing device. At the same time, carbon dioxide gas is supplied to the shell through the carbon dioxide cylinder. The high-frequency heater and the circumferential heater heat the ends of the two steel bars, so that their surfaces melt. S4. After heating is completed, remove the circumferential heater and drive the conical cylinder to rotate through the rotary drive box, which in turn drives the second steel bar to rotate. At the same time, push the second clamp through the hydraulic push rod to drive the first steel bar to move, so that the two steel bars are forged and rotated to complete the docking, and drive the docked two steel bars to move. S5. Repeat steps S2 to S4 until the welded length of the reinforcing bars reaches the required length.

[0014] This invention provides a hot-rolled ribbed steel bar butt welding device and method based on high-frequency brazing. This fully automated steel bar butt welding mechanism enables unmanned butt welding of steel bars, replacing traditional steel bar butt welding techniques. It minimizes impact on the power grid, provides high butt strength, and ensures stable welding quality, overcoming the drawbacks of traditional steel bar butt welding such as light pollution, spatter, and unreliable quality. The device can be used alone for butt welding two steel bars, or combined with a conveying device to form a production line for continuous butt welding of steel bars. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is an isometric view of the overall structure of the present invention; Figure 2 This is a top view of the overall structure of the invention; Figure 3 This is a top view of the cutting device of the present invention; Figure 4 This is the present invention. Figure 2 AA section view; Figure 5 This is an isometric view of the rotating mechanism of the present invention; Figure 6 This is a cross-sectional view of the rotating mechanism of the present invention; Figure 7 This is an internal sectional view of the high-frequency brazing device of the present invention; Figure 8This is a top view of the hydraulic pushing device of the present invention; In the diagram: 1. Support frame; 2. Guide wheel assembly; 3. Guide groove; 4. Cutting device; 401. Saw blade; 402. First clamp; 403. First push rod; 404. Cutting drive box; 405. Fixed plate; 406. Slide rail; 407. Second push rod; 408. Rotating mechanism; 5. Rotating drive box; 501. Extrusion cylinder; 502. Fixed seat; 503. Driven wheel; 504. Belt; 505. Conical cylinder; 506. Third push rod; 507. Bearing; 508. Conical wedge; 509. High-frequency brazing device; 6. Housing; 601. High-frequency heater; 602. Circumferential heater; 603. Fourth push rod; 604. Hydraulic pushing device; 7. Hydraulic push rod; 701. Sliding plate; 702. Second clamp; 703. Fifth push rod; 704. Receiving bucket; 8. Carbon dioxide cylinder; 9. Detailed Implementation

[0016] Example 1: like Figures 1-2 As shown, a hot-rolled ribbed steel bar butt welding device and its usage method based on high-frequency brazing are disclosed. Multiple guide wheel groups 2 are horizontally installed on the support frame 1. The steel bars move back and forth against the guide wheel groups 2. The guide wheel group 2 includes a V-shaped guide wheel and a motor. The motor can drive the V-shaped guide wheel to rotate, thereby driving the steel bars on the V-shaped guide wheel to move. The guide groove 3 installed at the end of the support frame 1 can facilitate the movement of the steel bars against the guide wheel group 2.

[0017] The clamping parts in the cutting device 4, rotating mechanism 5, high-frequency brazing device 6, and hydraulic pushing device 7 are all flush with the guide wheel assembly 2, so that the steel bars moving on the guide wheel assembly 2 can enter the cutting device 4, rotating mechanism 5, high-frequency brazing device 6, and hydraulic pushing device 7, thereby cutting, heating, and upsetting and rotating the steel bars.

[0018] Each device is equipped with a sensor switch. The position of the reinforcing bar is detected by the sensor switch, thereby controlling the drive of the guide wheel assembly 2 to move the reinforcing bar.

[0019] Example 2: like Figures 1-4 As shown, the guide wheel assembly 2 drives the steel bar into the cutting device 4. Only the rear end of the first steel bar needs to be cut. The steel bar moves to the front end of the cutting device 4 and abuts the rear end of the steel bar against the stop block 402. The saw blade 401 is driven by the cutting drive box 405 to cut the steel bar. When the steel bar moves, the stop block 402 is in a retracted state. During the cutting operation, the stop block 402 is pushed up by the second push rod 408. The stop block 402 moves against the slide rail 407 on the fixed plate 406 through the slide groove, so that the movement is smoother.

[0020] The second rebar needs to be cut at both ends. The front end of the rebar is first placed against the stop block 402, and then cut with the saw blade 401. After welding it to the previous rebar, the rear end of the rebar is then placed against the stop block 402 and cut with the saw blade 401. The next rebar is cut and welded in sequence, making the operation convenient and quick.

[0021] The cutting drive box 405 can drive the saw blade 401 to reciprocate for cutting, and can also drive the saw blade 401 to move up and down, thereby cutting the steel bars. The cut steel bars can fall into the receiving bucket 8 for collection.

[0022] When the reinforcing bar is being cut, the first push rod 404 drives the first clamp 403 to clamp the reinforcing bar, ensuring that the reinforcing bar is fixed during cutting.

[0023] Example 3: like Figures 1-2 As shown in Figures 5 and 6, the cut steel bars enter the rotating mechanism 5, which can fix the welded steel bar. The third push rod 507 drives the extrusion cylinder 502 to move against the conical cylinder 506, thereby causing the conical wedge block 509 to extrude and deform the conical cylinder 506, so that the conical cylinder 506 fixes the steel bar inside. At the same time, the motor and belt 505 in the rotation drive box 501 can drive the driven wheel 504 and the conical cylinder 506 to rotate, so that the two steel bars can be forged and rotated to complete the docking.

[0024] The end of the tapered cylinder 506 is fixed to the fixed seat 503 by a bearing seat and rotates. The tapered wedge 509 abuts against the extrusion cylinder 502 and rotates by a bearing 508, thereby ensuring that the tapered cylinder 506 can rotate and drive the steel bar to rotate.

[0025] The openings on the periphery of the conical cylinder 506 allow the conical wedge block 509 to move in conjunction with the conical surface of the conical cylinder 506, causing the conical cylinder 506 to contract and clamp the reinforcing bar.

[0026] Because of the irregular shape of the steel bar cross-section, the inner diameter of the conical barrel varies after clamping. The clamping tightness of the steel bar is determined by the current range of the third push rod 507; the stroke of the third push rod 507 is adjusted accordingly. L calculates the diameter of the reinforcing bar. The algorithm is =50-2× L×tanθ±1 (50 is the initial inner diameter of the conical cylinder, 50mm). After the steel bars are welded, the extrusion cylinder 502 moves in the opposite direction to the initial position via the third push rod 507, and the conical cylinder 506 recovers to its initial state through its own elastic deformation.

[0027] Example 4: like Figures 1-2As shown in Figure 7, during welding, the circumferential heater 603 extends out, with the end of the first steel bar abutting against one side of the circumferential heater 603 and the end of the second steel bar abutting against the other side of the circumferential heater 603. At the same time, carbon dioxide is filled into the housing 601 through the carbon dioxide cylinder 9.

[0028] The high-frequency heater 602 is fitted onto the end of the reinforcing bar and can heat the reinforcing bar to 1350 degrees. The circumferential heater 603 heats the end face of the reinforcing bar to 1450 degrees, causing the surface of the reinforcing bar to melt. After heating is completed, the hydraulic pushing device 7 drives the previous reinforcing bar to move and abut against the next reinforcing bar. At the same time, the next reinforcing bar is clamped and rotated under the action of the rotating mechanism 5, so that the two reinforcing bars are up-forged and rotated to connect.

[0029] Preferably, the high-frequency brazing device 6 may also be equipped with a grinding device, which can move and extend to grind the cut part of the end face of the steel bar to ensure the quality of the heat welding.

[0030] Preferably, an outer circle grinding device can also be provided on the outside of the high-frequency brazing device 6 to grind the welding slag of the two steel bars to ensure the smoothness of the weld.

[0031] Example 5: like Figures 1-2 As shown in Figure 8, the first rebar moves to the hydraulic pushing device 7, and the second clamp 703 is driven by the fifth push rod 704 to clamp the rebar. After welding is completed, the sliding plate 702 is pushed by the hydraulic push rod 701 to move so that the two rebars are welded together.

[0032] The sliding plate 702 moves against the support frame 1 on both sides via sliders and slide rails to ensure smooth movement.

[0033] The hydraulic push rod 701 contains a magnetic scale that provides feedback on the pushing distance. The hydraulic cylinder of the push rod 701 is controlled by a proportional valve, allowing the thrust to be adjusted according to the pressure-stroke curve set based on the rebar specifications. A limit switch protects the hydraulic push rod 701's stroke, limiting its maximum and minimum travel. The limit switch position is the starting position of the hydraulic push rod 701; when it reaches its limit position, its stroke is set to 0 to eliminate accumulated errors. The inductive switch primarily determines the position of the rebar end; when the rebar passes through the inductive switch's sensing area, the switch's output state changes.

[0034] Example 6: like Figures 1-8As shown, the method is as follows: Step 1: The reinforcing bar is put into the guide groove 3 and driven to move by the guide wheel group 2. First, it passes through the cutting device 4. After the reinforcing bar moves to the front end of the cutting device 4, the rear end block 402 is lifted by the second push rod 408, and the reinforcing bar is driven to move in the opposite direction so that the end of the reinforcing bar abuts against the block 402. The first push rod 404 pushes the first clamp 403 to clamp the reinforcing bar. Then, the saw blade 401 is driven by the cutting device 4 to cut the rear end of the reinforcing bar. Step 2: After the first rebar is cut, continue to move forward to the hydraulic pushing device 7, and then put the second rebar into the guide groove 3. The front end block 402 is lifted by the second push rod 408. The front end of the second rebar moves against the block 402 and is locked by the first clamp 403. The saw blade 401 is driven by the cutting device 4 to cut the front end of the rebar. Then the rebar is driven to move and the rear end of the second rebar is cut in step 1. Step 3: The circumferential heater 603 in the high-frequency brazing device 6 is driven out by the fourth push rod 604, and the first and second steel bars are driven to move and abut against the two sides of the circumferential heater 603. The two steel bars are locked by the rotating mechanism 5 and the hydraulic pushing device 7. At the same time, carbon dioxide gas is supplied to the shell 601 through the carbon dioxide cylinder 9. The high-frequency heater 602 and the circumferential heater 603 heat the ends of the two steel bars, so that their surfaces melt. Step 4: After heating is completed, remove the circumferential heater 603, and drive the conical cylinder 506 to rotate through the rotary drive box 501, which in turn drives the second steel bar to rotate. At the same time, the hydraulic push rod 701 pushes the second clamp 703 to move the first steel bar, so that the two steel bars are forged and rotated to complete the docking, and drive the docked two steel bars to move. Step 5: Repeat steps 2-4 until the required weld length of the reinforcing bars is achieved.

[0035] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A butt welding device for hot-rolled ribbed steel bars based on high-frequency brazing, characterized in that: It includes multiple guide wheel groups arranged horizontally on the support frame, and the steel bars move against the multiple guide wheel groups. A cutting device, a rotating mechanism, a high-frequency brazing device and a hydraulic pushing device are arranged sequentially on one side of the multiple guide wheel groups. The cutting device includes a saw blade, a stop block, and a first clamp. The stop block and the first clamp are located on both sides of the saw blade. During cutting, the two ends of the steel bar abut against the stop blocks on both sides and are fixed by the first clamp. The saw blade then cuts the two ends of the steel bar. The high-frequency brazing apparatus includes a housing, a high-frequency heater, and a circumferential heater. The high-frequency heater is located on both sides of the circumferential heater. The housing is filled with carbon dioxide gas. The ends of the two steel bars are located inside the high-frequency heater, and the circumferential heater is located on the end faces of the two steel bars. The rotating mechanism and the hydraulic pushing device are located on both sides of the high-frequency brazing device. The rotating mechanism is used to drive the next steel bar to rotate, and the hydraulic pushing device is used to drive the previous steel bar to move, so that the two steel bars are up-forged and rotated to complete the butt joint. A carbon dioxide cylinder is provided on one side of the high-frequency brazing device. The carbon dioxide cylinder is connected to the shell. The high-frequency heater is coaxially arranged with the moving steel bar on the guide wheel assembly. The circumferential heater is located between the two high-frequency heaters and is used to heat the end faces of the two steel bars. The circumferential heater is connected to the housing on both sides by the fourth push rod, thereby driving the circumferential heater to move through the fourth push rod; The rotating mechanism includes a rotating drive box, a conical cylinder, and an extrusion cylinder. The extrusion cylinder is sleeved on the end of the conical cylinder. A third push rod is provided between the extrusion cylinder and the conical cylinder. The extrusion cylinder and the conical cylinder are moved relative to each other by the third push rod, so that the extrusion cylinder locks the steel bar. The rotating drive box is used to drive the conical cylinder to rotate. A fixed seat is fixed on one side of the rotary drive box. The end of the conical cylinder abuts against the fixed seat and rotates through a bearing seat. A driven wheel is fixed on the end of the conical cylinder. The driven wheel is connected to the motor inside the rotary drive box through a belt. The conical cylinder has multiple openings on its periphery. Inside the extrusion cylinder is a rotating conical wedge. The conical wedge is fitted onto the conical cylinder. The extrusion cylinder is driven to move by the third push rod, so that the conical wedge squeezes the conical cylinder to contract and lock the reinforcing bar. The hydraulic pushing device includes a hydraulic push rod, a sliding plate, and a second clamp. The sliding plate slides against the support frame through a sliding assembly. The hydraulic push rod is fixed on the support frame and is used to drive the sliding plate to move. The second clamp is provided on the sliding plate, and a fifth push rod is provided on the sliding plate to drive the second clamp to clamp the steel bar. The current range of the third push rod is used to determine whether the reinforcing bar is clamped, and the diameter of the reinforcing bar is calculated by using the stroke ΔL of the third push rod. It automatically adapts to the corresponding welding parameters.

2. The butt welding device for hot-rolled ribbed steel bars based on high-frequency brazing according to claim 1, characterized in that: The support frame is fixed with a guide groove at the end, and the guide wheel assembly is equipped with a drive mechanism to drive the V-shaped guide wheel in the guide wheel assembly to rotate, and the steel bar moves against the guide wheel assembly.

3. The butt welding device for hot-rolled ribbed steel bars based on high-frequency brazing according to claim 1, characterized in that: The cutting device is located between two guide wheel groups. The cutting drive box in the cutting device is fixed on the support frame. A first push rod is provided between the cutting drive box and the first clamp. The first push rod is used to drive the first clamp to clamp the steel bar. The cutting device is used to drive the saw blade to move back and forth and up and down rapidly, thereby cutting the ends of the reinforcing bars.

4. The butt welding device for hot-rolled ribbed steel bars based on high-frequency brazing according to claim 3, characterized in that: The support frame has an opening, and fixed plates are fixed on both sides of the opening. The stop block slides against the fixed plates. The blocks move along the slide rails on both sides via sliding grooves, and the slide rails are fixed to the fixed plate; A second push rod is provided between the fixed plate and the stop block, and the second push rod is used to drive the stop block to move.

5. The butt welding device for hot-rolled ribbed steel bars based on high-frequency brazing according to claim 4, characterized in that: A receiving bucket is fixed below the opening of the support frame, which is used to collect the cut steel bar ends.

6. The method of using a hot-rolled ribbed steel bar welding device based on high-frequency brazing according to claim 4, the method is as follows: S1, the steel bar is put into the guide groove and driven to move by the guide wheel group. First, it passes through the cutting device. After the steel bar moves to the front end of the cutting device, the rear end block is lifted by the second push rod, and the steel bar is driven to move in the opposite direction so that the end of the steel bar abuts against the block. The first clamp is clamped by the first push rod, and then the saw blade is driven by the cutting device to cut the rear end of the steel bar. S2. After the first rebar is cut, continue to move forward to the hydraulic pushing device, and then put the second rebar into the guide groove. The front end block is lifted by the second push rod. The front end of the second rebar moves against the block and is locked by the first clamp. The saw blade is driven by the cutting device to cut the front end of the rebar. Then the rebar is driven to move and the rear end of the second rebar is cut in step S1. S3. The circumferential heater in the high-frequency brazing device is driven out by the fourth push rod, and drives the first and second steel bars to move and abut against the two sides of the circumferential heater. The two steel bars are locked by the rotating mechanism and the hydraulic pushing device. At the same time, carbon dioxide gas is supplied to the shell through the carbon dioxide cylinder. The high-frequency heater and the circumferential heater heat the ends of the two steel bars, so that their surfaces melt. S4. After heating is completed, remove the circumferential heater and drive the conical cylinder to rotate through the rotary drive box, which in turn drives the second steel bar to rotate. At the same time, push the second clamp through the hydraulic push rod to drive the first steel bar to move, so that the two steel bars are forged and rotated to complete the docking, and drive the docked two steel bars to move. S5. Repeat steps S2 to S4 until the welded length of the reinforcing bars reaches the required length.

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