Welding device and method for welding connecting pieces among multiple anchor rods on inner wall of highway tunnel

Abstract

The invention discloses a welding device and method for welding connecting pieces between multiple anchor rods on the inner wall of a highway tunnel, and relates to the technical field of welding connecting pieces between anchor rods. A movable trailer is provided with a positioning and clamping assembly used for clamping the tails of two U-shaped pieces of the connecting pieces; the left side and the right side of the positioning and clamping assembly are each provided with a welding assembly used for pulling the tail of the U-shaped piece of the connecting piece towards the inner side and welding the U-shaped piece to the anchor rod. The positioning and clamping assembly comprises a lifting oil cylinder fixedly arranged on the bottom surface of the movable trailer, a piston rod of the lifting oil cylinder upwards penetrates through the movable trailer, a lifting table is fixedly arranged at the extending end of the piston rod, a guide rail is fixedly arranged on the top surface of the lifting table, the main shaft is sleeved with a torsional spring, and a vertical plate and a double-acting oil cylinder are sequentially and fixedly arranged on the top of the rotating disc. The welding device has the beneficial effects that the connecting piece can be firmly welded between the two anchor rods, and the welding efficiency of the connecting piece and the two anchor rods is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding connecting pieces between anchor bolts, in particular to a welding device and method for welding connecting pieces between multiple anchor bolts on the inner wall of a highway tunnel. Background Art

[0002] A cement layer 1 with a certain thickness is usually constructed on the inner wall of a highway tunnel. Along the length direction of the highway tunnel, a row of spaced anchor bolts 2 are constructed in the cement layer 1. As Figures 1 to 2 shown, the distance between every two adjacent anchor bolts 2 is equal. The inner ends of the anchor bolts 2 are embedded in the tunnel, and the outer ends of the anchor bolts 2 extend outside the cement layer 1. Among them, the function of the cement layer 1 is to support the highway tunnel, and the function of the anchor bolts 2 is to support the cement layer 1.

[0003] In order to prevent the anchor bolts 2 from loosening, workers will weld a connecting piece 3 as Figures 3 to 4 shown between the outer ends of every two adjacent anchor bolts 2 to increase the connection strength between the anchor bolts 2. Among them, the connecting piece 3 includes a flat plate 4 and U-shaped pieces 5 fixedly arranged at the left and right ends of the flat plate 4 respectively. The horizontal distance between the two U-shaped pieces 5 is equal to the horizontal distance between the two anchor bolts 2.

[0004] Currently, the method for workers to weld a connecting piece 3 between the outer ends of every two adjacent anchor bolts 2 is as follows: S1. Workers take out a connecting piece 3 as Figures 3 to 4 shown, and respectively put the two U-shaped pieces 5 on the connecting piece 3 from front to back on the outer ends of the two anchor bolts 2, as Figure 5 shown; S2. Welding the left U-shaped piece 5 of the connecting piece 3 to the left anchor bolt 2, and its specific operation steps are: S21. Workers direct the welding head 7 of the laser welding machine 6 towards the left U-shaped piece 5 of the connecting piece 3, as Figure 6 shown; S22. Workers turn on the laser welding machine 6, and the laser beam generated on the welding head 7 is directed towards the outer surface of the U-shaped piece 5, thereby preliminarily welding the U-shaped piece 5 to the left anchor bolt 2; S23. Workers rotate the welding head 7 relative to the U-shaped piece 5, and the rotation direction is as Figure 7 shown by the solid arrow in the figure. When the welding head 7 rotates to a certain angle, an arc-shaped weld scar is formed on the outer surface of the U-shaped piece 5, and then the left U-shaped piece 5 of the connecting piece 3 is welded to the left anchor bolt 2; S3. Workers repeat the operation of step S2 once, and then the right U-shaped piece 5 of the connecting piece 3 can be welded to the right anchor bolt 2, thus realizing the welding of a connecting piece 3 between the outer ends of the two anchor bolts 2; S4. Workers repeat the operations in steps S1 - S3 multiple times, and then a connector 3 can be welded to the outer ends of every two adjacent anchor bolts 2.

[0005] However, although the method used by workers can weld a connector to the outer ends of every two adjacent anchor bolts, the following technical defects are still shown in actual operations: I. In step S1, after the two U - shaped parts 5 of the connector 3 are respectively sleeved on the outer ends of the two anchor bolts 2, there is a gap between the inner surface of the U - shaped part 5 and the outer surface of the anchor bolt 2. (The reason for this gap is that when the worker sleeved the U - shaped part 5 of the connector 3 on the anchor bolt 2, the worker accidentally pressed down the tail of the U - shaped part 5, resulting in an increase in the groove width of the U - shaped groove of the U - shaped part 5). Due to the existence of the gap, the U - shaped part 5 cannot be fully welded to the anchor bolt 2, and further, the connector 3 cannot be firmly welded between the two anchor bolts 2, thus failing to achieve the purpose of increasing the connection strength between the anchor bolts 2.

[0006] II. In step S2, it is necessary to manually rotate the welding head 7 of the laser welding machine 6 to form an arc - shaped weld bead on the outer surface of the U - shaped part 5. However, during the process of the worker rotating the welding head 7 manually, it is impossible to ensure that the distance H between the end of the welding head 7 and the outer surface of the U - shaped part 5 remains constant all the time. As a result, the thickness of the formed arc - shaped weld bead is uneven, and further, the U - shaped part 5 cannot be fully welded to the anchor bolt 2, and then the connector 3 cannot be firmly welded between the two anchor bolts 2, thus failing to achieve the purpose of increasing the connection strength between the anchor bolts 2.

[0007] III. In steps S2 - S3, it is necessary to first use the welding head 7 of the laser welding machine 6 to weld the left U - shaped part 5 of the connector 3 to the left anchor bolt 2, and then use the welding head 7 of the laser welding machine 6 to weld the right U - shaped part 5 of the connector 3 to the right anchor bolt 2, so as to weld the connector 3 between the two anchor bolts 2. And the whole welding process needs to be carried out in two separate processes, which causes a long time to weld a connector 3 between the two anchor bolts 2, and further reduces the welding efficiency of the connector 3 and the two anchor bolts 2.

[0008] Therefore, there is an urgent need for a welding device and method that can firmly weld the connector 3 between the two anchor bolts 2 and greatly improve the welding efficiency of the connector 3 and the two anchor bolts 2. Summary of the Invention

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a welding device and method for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel, which can firmly weld the connector between the two anchor bolts and greatly improve the welding efficiency of the connector and the two anchor bolts.

[0010] The object of the present invention is achieved by the following technical solutions: A welding device for welding connecting pieces between multiple anchor bolts on the inner wall of a highway tunnel, which includes a mobile trailer. A positioning and clamping assembly for clamping the tails of two U-shaped pieces of the connecting piece is arranged on the mobile trailer. Welding assemblies for pulling the tails of the U-shaped pieces of the connecting piece inward and welding the U-shaped pieces to the anchor bolts are arranged on both the left and right sides of the positioning and clamping assembly. The positioning and clamping assembly includes a lifting oil cylinder fixed on the bottom surface of the mobile trailer. The piston rod of the lifting oil cylinder penetrates upward through the mobile trailer, and a lifting platform is fixed on the extending end. A guide rail is fixed on the top surface of the lifting platform. A sliding table is slidably installed on the guide rail. The top surface of the sliding table is rotatably installed with a main shaft through a bushing. A turntable is fixed on the top of the main shaft. A torsion spring is sleeved on the main shaft. Two legs of the torsion spring are respectively fixed on the bushing and the turntable. A vertical plate and a double-acting oil cylinder are sequentially fixed on the top of the turntable. Rod members are fixed on the acting ends of the left and right piston rods of the double-acting oil cylinder. Arc-shaped clamping blocks are fixed on the outer ends of the two rod members. Fixing plates opposite to the arc-shaped clamping blocks are welded on the two rod members. A movable plate located between the arc-shaped clamping block and the fixing plate is slidably sleeved on the rod member. A horizontal spring A is fixed between the movable plate and the fixing plate. A clamping oil cylinder located below the arc-shaped clamping block is fixed on the outer end surface of the movable plate. The chuck of the clamping oil cylinder faces outward. Limit plates are fixed on the top surfaces of the left and right ends of the guide rail. Horizontal springs B are fixed between the two limit plates and the side end surfaces of the sliding table.

[0011] The two rod members are symmetrically arranged with respect to the cylinder body of the double-acting oil cylinder. The two clamping oil cylinders are symmetrically arranged with respect to the cylinder body of the double-acting oil cylinder. The two arc-shaped clamping blocks are symmetrically arranged with respect to the cylinder body of the double-acting oil cylinder.

[0012] A handle is fixed on the right end surface of the mobile trailer.

[0013] The welding assembly on the left side includes a feeding oil cylinder fixed on the left end surface of the vertical plate, and an L-shaped plate fixed on the acting end of the piston rod of the feeding oil cylinder. An opening arc-shaped strip is fixed on the top of the vertical plate of the L-shaped plate. The axis of the opening arc-shaped strip is on the same horizontal plane as the axis of the arc-shaped clamping block and is parallel to the axis of the arc-shaped clamping block. A slider is slidably sleeved on the opening arc-shaped strip. A support plate is fixed on the top surface of the slider. A pin shaft is fixed on the front end surface of the upper end of the support plate. A welding head is fixed on the top surface of the slider. The welding head is arranged radially along the opening arc-shaped strip. A tension spring is also sleeved on the opening arc-shaped strip. One end of the tension spring is fixed on the top end of the opening arc-shaped strip, and the other end is fixed on the slider. A vertical lead screw nut pair is provided on the horizontal plate of the L-shaped plate. A shifting plate is fixedly installed on the nut of the vertical lead screw nut pair. A strip-shaped groove is formed in the shifting plate, and the strip-shaped groove of the shifting plate is sleeved outside the pin shaft of the support plate. A pressing wheel is also rotatably installed on the inner end surface of the vertical plate of the L-shaped plate.

[0014] A laser welding machine is fixedly installed on the outer end surface of the vertical lead screw nut pair, and the output port of the laser welding machine is connected to a welding head.

[0015] The two welding assemblies are symmetrically arranged with respect to the vertical plate of the positioning and clamping assembly.

[0016] The welding device further includes a controller, and the controller is connected to the lifting oil cylinder, the double-acting oil cylinder, the feeding oil cylinder, the clamping oil cylinder, the vertical lead screw nut pair, and the laser welding machine.

[0017] A method for welding a connecting piece between multiple anchor bolts on the inner wall of a highway tunnel, which includes the following steps: S1. A worker takes out a connecting piece, and respectively sleeves the two U-shaped pieces on the connecting piece from front to back on the outer ends of the two anchor bolts. S2. The worker drags the handle to move the mobile trailer on the ground. When the worker observes that the double-acting oil cylinder of the positioning and clamping assembly is just directly below the area enclosed by the two anchor bolts, the worker stops dragging the handle. S3. Control the piston rod of the lifting oil cylinder of the positioning and clamping assembly to extend upward. The piston rod drives the lifting platform to move upward. The lifting platform drives the guide rail, the sliding table, the main shaft, the vertical plate, and the double-acting oil cylinder to move upward synchronously, and further drives the two rods and the arc-shaped clamping blocks to move upward synchronously. When the worker observes that the arc-shaped clamping blocks are opposite to the anchor bolts, the worker controls the lifting oil cylinder to close. S4. Control the two piston rods of the double-acting oil cylinder to extend outward. The piston rods drive the rods to move outward. The rods drive the fixed plate, the horizontal spring A, the movable plate, the clamping oil cylinder, and the arc-shaped clamping blocks to move outward synchronously. The two arc-shaped clamping blocks move respectively towards the two anchor bolts. When the two piston rods of the double-acting oil cylinder are fully extended, the two arc-shaped clamping blocks respectively adaptively clamp on the outside of the two anchor bolts. At this time, the chucks of the two clamping oil cylinders are respectively sleeved outside the tails of the two U-shaped pieces of the connecting piece. At the same time, the axis of the opening arc-shaped strip is on the same horizontal plane as the axis of the anchor bolt, and the axis of the opening arc-shaped strip is parallel to the axis of the anchor bolt. S5. Control the two clamping oil cylinders to start. The two clamping oil cylinders both drive the chucks connected to them to close, and the chucks clamp the tails of the U-shaped pieces. At this time, the tails of the two U-shaped pieces of the connecting piece are respectively clamped by the chucks of the two clamping oil cylinders. S6. Control the piston rods of the feed cylinders of the two welding assemblies to retract inward. The piston rods drive the L-shaped plates to move inward. The L-shaped plates drive the vertical lead screw nut pairs, the dial plates, the open arc-shaped bars, the sliders, the tension springs, the support plates, and the welding heads to move synchronously inward. At the same time, the L-shaped plates also drive the pressure wheels to move toward the movable plates; As the piston rods of the feed cylinders continue to retract inward, the pressure wheels press against the movable plates. The movable plates compress the horizontal spring A relative to the stationary rods, and the movable plates also drive the clamping cylinders to move inward. The chucks of the clamping cylinders gradually pull the tails of the U-shaped parts inward; When the piston rods of the feed cylinders are fully retracted, the axis of the open arc-shaped bar coincides exactly with the axis of the anchor rod, and the welding heads face the left U-shaped parts of the connecting piece. At the same time, the tails of the U-shaped parts are straightened to eliminate the gap between the U-shaped parts and the outer surface of the anchor rod; S7. Control the laser welding machines of the two welding assemblies to start. The laser beams generated on the welding heads face the outer surfaces of the U-shaped parts, thereby preliminarily welding the U-shaped parts to the anchor rods; S8. Control the vertical lead screw nut pairs of the two welding assemblies to start. The nuts of the vertical lead screw nut pairs move downward. The nuts drive the dial plates to move downward. The dial plates press the pin shafts downward. The pin shafts press the support plates downward. The support plates rotate relative to the axis of the open arc-shaped bar. At the same time, the support plates drive the sliders to rotate relative to the axis of the open arc-shaped bar. The sliders drive the welding heads to rotate relative to the axis of the open arc-shaped bar. When the nuts of the vertical lead screw nut pairs move to the lower limit position, the welding heads just rotate to the set positions, thereby forming an arc-shaped weld bead on the outer surfaces of the U-shaped parts, and then welding the two U-shaped parts of the connecting piece to the two anchor rods respectively, thus finally achieving the welding of a connecting piece between the outer ends of the two anchor rods; S9. Workers repeat the operations of steps S1 to S8 multiple times, and a connecting piece can be welded well between the outer ends of every two adjacent anchor rods.

[0018] The present invention has the following advantages: It can firmly weld the connecting piece between the two anchor rods and greatly improve the welding efficiency of the connecting piece and the two anchor rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a cement layer and a row of anchor rods constructed on the inner wall of a highway tunnel; Figure 2 It is Figure 1 the C-C cross-sectional view of Figure 3 It is a schematic diagram of the structure of the connecting piece; Figure 4 It is Figure 3 the front view of Figure 5Schematic diagram for respectively sleeving two U-shaped parts on the connecting piece from front to back on the outer sides of two anchor rods; Figure 6 Schematic diagram for orienting the welding head of the laser welding machine towards the left U-shaped part of the connecting piece; Figure 7 Schematic diagram for a worker to rotate the welding head relative to the U-shaped part; Figure 8 Schematic structural diagram of the present invention; Figure 9 For Figure 8 Partial sectional schematic diagram; Figure 10 Schematic structural diagram of the positioning and clamping assembly; Figure 11 For Figure 10 Partial sectional schematic diagram; Figure 12 Schematic diagram of the connection of the arc-shaped clamping block, rod, double-acting oil cylinder, clamping oil cylinder and fixing plate; Figure 13 Schematic structural diagram of the welding assembly; Figure 14 For Figure 13 Front view; Figure 15 Schematic diagram of the connection of the open arc-shaped strip, slider, welding head and support plate; Figure 16 Schematic structural diagram of the dial plate; Figure 17 Schematic diagram for the double-acting oil cylinder to be directly below the area enclosed by two anchor rods; Figure 18 Schematic diagram for the arc-shaped clamping block to be opposite to the anchor rod; Figure 19 Schematic diagram for two arc-shaped clamping blocks to respectively and adaptively clamp on the outsides of two anchor rods; Figure 20 Schematic diagram for the tails of two U-shaped parts of the connecting piece to be respectively clamped by the chucks of two clamping oil cylinders; Figure 21 For Figure 20 Partial enlarged view of part D; Figure 22 Schematic diagram for the axis of the open arc-shaped strip to coincide with the axis of the anchor rod; Figure 23 Schematic diagram for the welding head to rotate downward to a set position; In the figure: 1 - Cement layer, 2 - Anchor rod, 3 - Connecting piece, 4 - Flat plate, 5 - U-shaped part, 6 - Laser welding machine, 7 - Welding head; 8 - Mobile trailer, 9 - Positioning and clamping assembly, 10 - Welding assembly; 11 - Lifting cylinder, 12 - Lifting platform, 13 - Guide rail, 14 - Slide table, 15 - Bush, 16 - Spindle, 17 - Turntable, 18 - Torsion spring, 19 - Vertical plate, 20 - Double-acting cylinder, 21 - Rod, 22 - Arc-shaped clamping block, 23 - Fixed plate, 24 - Movable plate, 25 - Horizontal spring A, 26 - Clamping cylinder, 27 - Chuck, 28 - Horizontal spring B; 29 - Feeding cylinder, 30 - L-shaped plate, 31 - Open arc-shaped strip, 32 - Slide block, 33 - Support plate, 34 - Pin shaft, 35 - Tension spring, 36 - Vertical lead screw nut pair, 37 - Nut, 38 - Pusher plate, 39 - Strip-shaped groove, 40 - Pressure wheel. Specific embodiments

[0020] The following further describes the present invention with reference to the accompanying drawings. The protection scope of the present invention is not limited to the following: As Figures 8 to 16 shown, a welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel includes a mobile trailer 8. A positioning and clamping assembly 9 for clamping the tails of two U-shaped parts 5 of the connector 3 is provided on the mobile trailer 8. Welding assemblies 10 for pulling the tails of the U-shaped parts 5 of the connector 3 inward and welding the U-shaped parts 5 to the anchor bolts 2 are provided on both the left and right sides of the positioning and clamping assembly 9. A handle is fixedly provided on the right end surface of the mobile trailer 8. The two welding assemblies 10 are symmetrically arranged with respect to the vertical plate 19 of the positioning and clamping assembly 9.

[0021] The positioning and clamping assembly 9 includes a lifting cylinder 11 fixedly provided on the bottom surface of the mobile trailer 8. The piston rod of the lifting cylinder 11 penetrates upward through the mobile trailer 8 and a lifting platform 12 is fixedly provided at the extending end. A guide rail 13 is fixedly provided on the top surface of the lifting platform 12. A slide table 14 is slidably mounted on the guide rail 13. The top surface of the slide table 14 is rotatably mounted with a spindle 16 through a bush 15. A turntable 17 is fixedly provided at the top of the spindle 16. A torsion spring 18 is sleeved on the spindle 16. Two legs of the torsion spring 18 are respectively fixedly provided on the bush 15 and the turntable 17. A vertical plate 19 and a double-acting cylinder 20 are sequentially fixedly provided on the top of the turntable 17. Rods 21 are fixedly provided at the acting ends of the left and right piston rods of the double-acting cylinder 20. Arc-shaped clamping blocks 22 are fixedly provided at the outer ends of the two rods 21. Fixed plates 23 opposite to the arc-shaped clamping blocks 22 are welded on the two rods 21. A movable plate 24 is slidably sleeved on the rod 21 between the arc-shaped clamping block 22 and the fixed plate 23. A horizontal spring A 25 is fixedly provided between the movable plate 24 and the fixed plate 23. A clamping cylinder 26 located below the arc-shaped clamping block 22 is fixedly provided on the outer end surface of the movable plate 24. The chuck 27 of the clamping cylinder 26 faces outward.

[0022] Limit plates are fixedly arranged on the top surfaces at the left and right ends of the guide rail 13, and horizontal springs B28 are fixedly arranged between the two limit plates and the side end faces of the sliding table 14. The two rods 21 are symmetrically arranged with respect to the cylinder block of the double-acting oil cylinder 20, the two clamping oil cylinders 26 are symmetrically arranged with respect to the cylinder block of the double-acting oil cylinder 20, and the two arc-shaped clamping blocks 22 are symmetrically arranged with respect to the cylinder block of the double-acting oil cylinder 20.

[0023] The welding assembly 10 on the left side includes a feeding oil cylinder 29 fixedly arranged on the left end face of the vertical plate 19, and an L-shaped plate 30 fixedly arranged on the acting end of the piston rod of the feeding oil cylinder 29. An open arc-shaped strip 31 is fixedly arranged on the top of the vertical plate of the L-shaped plate 30. The axis of the open arc-shaped strip 31 is on the same horizontal plane as the axis of the arc-shaped clamping block 22 and is parallel to the axis of the arc-shaped clamping block 22. A slider 32 is slidably sleeved on the open arc-shaped strip 31. A support plate 33 is fixedly arranged on the top surface of the slider 32. A pin shaft 34 is fixedly arranged on the front end face of the upper end of the support plate 33. A welding head 7 is fixedly arranged on the top surface of the slider 32, and the welding head 7 is arranged radially along the open arc-shaped strip 31. A tension spring 35 is also sleeved on the open arc-shaped strip 31. One end of the tension spring 35 is fixedly arranged on the top end of the open arc-shaped strip 31, and the other end is fixedly arranged on the slider 32. A vertical lead screw nut pair 36 is arranged on the horizontal plate of the L-shaped plate 30. A dial plate 38 is fixedly arranged on the nut 37 of the vertical lead screw nut pair 36. A strip-shaped groove 39 is formed in the dial plate 38, and the strip-shaped groove 39 of the dial plate 38 is sleeved outside the pin shaft 34 of the support plate 33. A pressure wheel 40 is rotatably installed on the inner end face of the vertical plate of the L-shaped plate 30. A laser welding machine 6 is fixedly arranged on the outer end face of the vertical lead screw nut pair 36, and the output port of the laser welding machine 6 is connected to the welding head 7.

[0024] The welding device further includes a controller, which is connected to the lifting oil cylinder 11, the double-acting oil cylinder 20, the feeding oil cylinder 29, the clamping oil cylinder 26, the vertical lead screw nut pair 36, and the laser welding machine 6. Workers can control the extension or retraction of the piston rods of the lifting oil cylinder 11, the double-acting oil cylinder 20, and the feeding oil cylinder 29 through the controller, and can also control the start or stop of the clamping oil cylinder 26, the vertical lead screw nut pair 36, and the laser welding machine 6. When the clamping oil cylinder 26 is closed, the chuck 27 on the clamping oil cylinder 26 is closed. When the laser welding machine 6 is started, the welding head 7 emits a laser beam.

[0025] A method for welding a connecting piece between multiple anchor bolts on the inner wall of a highway tunnel includes the following steps: S1. Workers take out a connecting piece 3 as shown in Figures 3 to 4 and respectively sleeved the two U-shaped pieces 5 on the connecting piece 3 from front to back on the outer ends of the two anchor bolts 2, as shown in Figure 5 . S2. The worker drags the handle to move the mobile trailer 8 on the ground. When the worker observes that the double-acting cylinder 20 of the positioning and clamping assembly 9 is just directly below the area enclosed by the two anchor bolts 2, as Figure 17 shown, the worker stops dragging the handle; S3. Control the piston rod of the lifting cylinder 11 of the positioning and clamping assembly 9 to extend upward. The piston rod drives the lifting platform 12 to move upward. The lifting platform 12 drives the guide rail 13, the sliding table 14, the main shaft 16, the vertical plate 19 and the double-acting cylinder 20 to move upward synchronously, and then drives the two rods 21 and the arc-shaped clamping block 22 to move upward synchronously. When the worker observes that the arc-shaped clamping block 22 is opposite to the anchor bolt 2, as Figure 18 shown, the worker controls the lifting cylinder 11 to close; S4. Control the two piston rods of the double-acting cylinder 20 to extend outward. The piston rods drive the rods 21 to move outward. The rods 21 drive the fixed plate 23, the horizontal spring A25, the movable plate 24, the clamping cylinder 26 and the arc-shaped clamping block 22 to move outward synchronously. The two arc-shaped clamping blocks 22 move toward the two anchor bolts 2 respectively. When the two piston rods of the double-acting cylinder 20 are fully extended, the two arc-shaped clamping blocks 22 are respectively self-adaptively clamped outside the two anchor bolts 2, as Figure 19 shown. At this time, the chucks 27 of the two clamping cylinders 26 are respectively sleeved outside the tails of the two U-shaped parts 5 of the connecting piece 3. At the same time, the axis of the opening arc-shaped strip 31 is on the same horizontal plane as the axis of the anchor bolt 2, and the axis of the opening arc-shaped strip 31 is parallel to the axis of the anchor bolt 2; S5. Control the two clamping cylinders 26 to start. The two clamping cylinders 26 both drive the chucks 27 connected to them to close. The chucks 27 clamp the tails of the U-shaped parts 5. At this time, the tails of the two U-shaped parts 5 of the connecting piece 3 are respectively clamped by the chucks 27 of the two clamping cylinders 26, as Figures 20 to 21 shown; S6. Control the piston rods of the feed cylinders 29 of the two welding assemblies 10 to retract inward. The piston rods drive the L-shaped plates 30 to move inward. The L-shaped plates 30 drive the vertical lead screw nut pair 36, the dial plate 38, the opening arc-shaped strip 31, the slider 32, the tension spring 35, the support plate 33 and the welding head 7 to move inward synchronously. At the same time, the L-shaped plates 30 also drive the pressure wheels 40 to move toward the movable plate 24; As the piston rods of the feed cylinders 29 continue to retract inward, the pressure wheels 40 press on the movable plate 24, as Figure 22 shown. The movable plate 24 compresses the horizontal spring A25 relative to the stationary rod 21, and the movable plate 24 also drives the clamping cylinder 26 to move inward. The chuck 27 of the clamping cylinder 26 gradually pulls the tail of the U-shaped part 5 inward; When the piston rods of the feed cylinders 29 are fully retracted, the axis of the opening arc-shaped strip 31 just coincides with the axis of the anchor bolt 2, asFigure 22 As shown, the welding head 7 faces the left U-shaped part 5 of the connecting piece 3. At the same time, the tail of the U-shaped part 5 is straightened to eliminate the gap between the U-shaped part 5 and the outer surface of the anchor rod 2; Among them, it can be seen from step S6 that since the tail of the U-shaped part 5 has been straightened, the gap between the U-shaped part 5 and the outer surface of the anchor rod 2 has been eliminated in advance. Therefore, it is ensured that in the subsequent welding process, the U-shaped part 5 is welded in a state of being in close contact with the anchor rod 2, realizing the full welding of the U-shaped part 5 on the anchor rod 2, and then enabling the connecting piece 3 to be firmly welded between the two anchor rods 2. Compared with the Figures 5 to 7 welding method shown, it serves the purpose of increasing the connection strength between the anchor rods 2.

[0026] S7. Control the laser welding machine 6 of the two welding assemblies 10 to start. The laser beam generated on the welding head 7 faces the outer surface of the U-shaped part 5, thereby preliminarily welding the U-shaped part 5 on the anchor rod 2; S8. Control the vertical lead screw nut pair 36 of the two welding assemblies 10 to start. The nut 37 of the vertical lead screw nut pair 36 moves downward. The nut 37 drives the dial 38 to move downward. The dial 38 presses the pin shaft 34 downward. The pin shaft 34 presses the support plate 33 downward. The support plate 33 rotates relative to the axis of the opening arc bar 31. At the same time, the support plate 33 drives the slider 32 to rotate relative to the axis of the opening arc bar 31. The slider 32 drives the welding head 7 to rotate relative to the axis of the opening arc bar 31. When the nut 37 of the vertical lead screw nut pair 36 moves to the lower limit position, the welding head 7 just rotates to the set position. The rotation direction of the welding head 7 is as shown by the solid arrow in Figure 23 , thereby forming an arc-shaped weld scar on the outer surface of the U-shaped part 5, and then welding the two U-shaped parts 5 of the connecting piece 3 on the two anchor rods 2 respectively, thus finally realizing the welding of a connecting piece 3 between the outer ends of the two anchor rods 2; S9. Workers repeat the operations of steps S1 - S8 multiple times, and a connecting piece 3 can be welded between the outer ends of each adjacent two anchor rods 2.

[0027] Among them, first in step S4, by controlling the retraction of the two piston rods of the double-acting oil cylinder 20, the two arc-shaped clamping blocks 22 are respectively clamped on the two anchor bolts 2, so that the axis of the open arc-shaped strip 31 and the axis of the anchor bolt 2 are on the same horizontal plane, and the axis of the open arc-shaped strip 31 is parallel to the axis of the anchor bolt 2; then in step S6, by controlling the retraction of the piston rod of the feed oil cylinder 29, the axis of the open arc-shaped strip 31 is just made to coincide with the axis of the anchor bolt 2; finally in step S8, by controlling the downward movement of the nut 37 of the vertical lead screw nut pair 36, the welding head 7 rotates relative to the axis of the open arc-shaped strip 31, so as to form an arc-shaped weld bead on the outer surface of the U-shaped part 5, and then the two U-shaped parts 5 of the connecting part 3 are respectively welded on the two anchor bolts 2, thus finally realizing the welding of a connecting part 3 between the outer ends of the two anchor bolts 2.

[0028] It can be seen from this that the welding head 7 rotates relative to the axis of the open arc-shaped strip 31, that is to say, the welding head 7 rotates relative to the axis of the anchor bolt 2, so as to ensure that the distance H between the end of the welding head 7 and the outer surface of the U-shaped part 5 remains unchanged all the time, and further ensure that the thickness of the arc-shaped weld bead formed after welding is uniform, realizing the full welding of the U-shaped part 5 on the anchor bolt 2, and then being able to firmly weld the connecting part 3 between the two anchor bolts 2. Compared with the welding method as Figures 5 to 7 shown, it serves the purpose of increasing the connection strength between the anchor bolts 2. In addition, through the linkage cooperation of the two welding assemblies 10 and the positioning and clamping assembly 9 of this welding device, the two U-shaped parts 5 of the connecting part 3 can be automatically welded on the two anchor bolts 2 respectively at the same time. Compared with the welding method as Figures 5 to 7 shown, there is no need to carry out separately in two processes, thus realizing the welding of a connecting part 3 between the two anchor bolts 2 in a short time, and then greatly improving the welding efficiency of the connecting part 3 and the two anchor bolts 2.

Claims

1. A welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel, characterized in that: It includes a mobile trailer (8), on which a positioning and clamping assembly (9) is provided for clamping the tails of two U-shaped parts (5) of the connecting piece (3). On the left and right sides of the positioning and clamping assembly (9), there is a welding assembly (10) for pulling the tails of the U-shaped parts (5) of the connecting piece (3) inward and for welding the U-shaped parts (5) to the anchor rod (2). The positioning and clamping assembly (9) includes a lifting oil cylinder (11) fixed on the bottom surface of the mobile trailer (8). The piston rod of the lifting oil cylinder (11) penetrates upward through the mobile trailer (8), and a lifting platform (12) is fixed on the extending end. On the top surface of the lifting platform (12), a guide rail (13) is fixed. A sliding table (14) is slidably mounted on the guide rail (13). On the top surface of the sliding table (14), a main shaft (16) is rotatably mounted through a bushing (15). A turntable (17) is fixed on the top of the main shaft (16). A torsion spring (18) is sleeved on the main shaft (16), and the two legs of the torsion spring (18) are respectively fixed on the bushing (15) and the turntable (17). On the top of the turntable (17), a vertical plate (19) and a double-acting oil cylinder (20) are successively fixed. On the acting ends of the left and right piston rods of the double-acting oil cylinder (20), a rod (21) is fixed respectively. On the outer ends of the two rods (21), an arc-shaped clamping block (22) is fixed respectively. On the two rods (21), a fixing plate (23) opposite to the arc-shaped clamping block (22) is welded. On the rod (21), a movable plate (24) located between the arc-shaped clamping block (22) and the fixing plate (23) is slidably sleeved. A horizontal spring A (25) is fixed between the movable plate (24) and the fixing plate (23). On the outer end face of the movable plate (24), a clamping oil cylinder (26) located below the arc-shaped clamping block (22) is fixed, and the chuck (27) of the clamping oil cylinder (26) faces outward.

2. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 1, characterized in that: On the top surfaces of the left and right ends of the guide rail (13), a limit plate is fixed respectively. A horizontal spring B (28) is fixed between the two limit plates and the side end face of the sliding table (14).

3. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 2, characterized in that: The two rods (21) are symmetrically arranged with respect to the cylinder block of the double-acting oil cylinder (20). The two clamping oil cylinders (26) are symmetrically arranged with respect to the cylinder block of the double-acting oil cylinder (20). The two arc-shaped clamping blocks (22) are symmetrically arranged with respect to the cylinder block of the double-acting oil cylinder (20).

4. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 3, characterized in that: A handle is fixed on the right end face of the mobile trailer (8).

5. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 4, characterized in that: The welding assembly (10) located on the left side includes a feeding oil cylinder (29) fixedly arranged on the left end face of the vertical plate (19), and an L-shaped plate (30) fixedly arranged on the acting end of the piston rod of the feeding oil cylinder (29). The top of the vertical plate of the L-shaped plate (30) is fixedly provided with an open arc-shaped strip (31). The axis of the open arc-shaped strip (31) is on the same horizontal plane as the axis of the arc-shaped clamping block (22), and the axis of the open arc-shaped strip (31) is parallel to the axis of the arc-shaped clamping block (22). A slider (32) is slidably sleeved on the open arc-shaped strip (31). A support plate (33) is fixedly arranged on the top surface of the slider (32). A pin shaft (34) is fixedly arranged on the front end face of the upper end of the support plate (33). A welding head (7) is fixedly arranged on the top surface of the slider (32). The welding head (7) is arranged along the radial direction of the open arc-shaped strip (31). A tension spring (35) is also sleeved on the open arc-shaped strip (31). One end of the tension spring (35) is fixedly arranged on the top end of the open arc-shaped strip (31), and the other end is fixedly arranged on the slider (32). A vertical lead screw nut pair (36) is arranged on the horizontal plate of the L-shaped plate (30). A dial plate (38) is fixedly arranged on the nut (37) of the vertical lead screw nut pair (36). A strip-shaped groove (39) is formed in the dial plate (38). The strip-shaped groove (39) of the dial plate (38) is sleeved outside the pin shaft (34) of the support plate (33). A pressure wheel (40) is rotatably installed on the inner end face of the vertical plate of the L-shaped plate (30).

6. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 5, characterized in that: A laser welding machine (6) is fixedly arranged on the outer end face of the vertical lead screw nut pair (36). The output port of the laser welding machine (6) is connected to the welding head (7).

7. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 6, characterized in that: The two welding assemblies (10) are symmetrically arranged with respect to the vertical plate (19) of the positioning and clamping assembly (9).

8. The welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 7, characterized in that: The welding device further includes a controller, and the controller is connected to the lifting oil cylinder (11), the double-acting oil cylinder (20), the feeding oil cylinder (29), the clamping oil cylinder (26), the vertical lead screw nut pair (36), and the laser welding machine (6).

9. A method for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel, using the welding device for welding connectors between multiple anchor bolts on the inner wall of a highway tunnel according to claim 8, characterized in that: It includes the following steps: S1. The worker takes out a connecting piece (3), and respectively sleeves the two U-shaped pieces (5) on the connecting piece (3) from front to back on the outer ends of the two anchor rods (2). S2. The worker drags the handle to move the mobile trailer (8) on the ground. When the worker observes that the double-acting oil cylinder (20) of the positioning and clamping assembly (9) is just right below the area enclosed by the two anchor rods (2), the worker stops dragging the handle. S3. Control the piston rod of the lifting oil cylinder (11) of the positioning and clamping assembly (9) to extend upward. The piston rod drives the lifting platform (12) to move upward. The lifting platform (12) drives the guide rail (13), the sliding table (14), the main shaft (16), the vertical plate (19), and the double-acting oil cylinder (20) to move upward synchronously, and further drives the two rods (21) and the arc-shaped clamping block (22) to move upward synchronously. When the worker observes that the arc-shaped clamping block (22) is opposite to the anchor rod (2), the worker controls the lifting oil cylinder (11) to close. S4. Control the two piston rods of the double-acting oil cylinder (20) to extend outwards. The piston rods drive the rod member (21) to move outwards. The rod member (21) drives the fixed plate (23), the horizontal spring A (25), the movable plate (24), the clamping oil cylinder (26) and the arc-shaped clamping block (22) to move outwards synchronously. The two arc-shaped clamping blocks (22) move towards the two anchor rods (2) respectively. After the two piston rods of the double-acting oil cylinder (20) are fully extended, the two arc-shaped clamping blocks (22) respectively and adaptively clamp the outsides of the two anchor rods (2). At this time, the chucks (27) of the two clamping oil cylinders (26) respectively sleeve the outsides of the tails of the two U-shaped members (5) of the connecting member (3). At the same time, the axis of the opening arc-shaped strip (31) is on the same horizontal plane as the axis of the anchor rod (2), and the axis of the opening arc-shaped strip (31) is parallel to the axis of the anchor rod (2). S5. Control the two clamping oil cylinders (26) to start. The two clamping oil cylinders (26) both drive the chucks (27) connected thereto to close. The chucks (27) clamp the tails of the U-shaped members (5). At this time, the tails of the two U-shaped members (5) of the connecting member (3) are respectively clamped by the chucks (27) of the two clamping oil cylinders (26). S6. Control the piston rods of the feed oil cylinders (29) of the two welding assemblies (10) to retract inwards. The piston rods drive the L-shaped plate (30) to move inwards. The L-shaped plate (30) drives the vertical lead screw nut pair (36), the dial plate (38), the opening arc-shaped strip (31), the slider (32), the tension spring (35), the support plate (33) and the welding head (7) to move inwards synchronously. At the same time, the L-shaped plate (30) also drives the pressure wheel (40) to move towards the movable plate (24). As the piston rod of the feed oil cylinder (29) continues to retract inwards, the pressure wheel (40) presses on the movable plate (24). The movable plate (24) compresses the horizontal spring A (25) relative to the stationary rod member (21). And the movable plate (24) also drives the clamping oil cylinder (26) to move inwards. And the chuck (27) of the clamping oil cylinder (26) gradually pulls the tail of the U-shaped member (5) inwards again. After the piston rod of the feed oil cylinder (29) is fully retracted, the axis of the opening arc-shaped strip (31) just coincides with the axis of the anchor rod (2). And the welding head (7) faces the left U-shaped member (5) of the connecting member (3). At the same time, the tail of the U-shaped member (5) is straightened to eliminate the gap existing between the outer surface of the U-shaped member (5) and the outer surface of the anchor rod (2). S7. Control the laser welding machines (6) of the two welding assemblies (10) to start. The laser beam generated on the welding head (7) faces the outer surface of the U-shaped member (5), so as to preliminarily weld the U-shaped member (5) on the anchor rod (2). S8. Start the vertical lead screw nut pair (36) of the two welding assemblies (10). The nut (37) of the vertical lead screw nut pair (36) moves downward. The nut (37) drives the dial plate (38) to move downward. The dial plate (38) presses the pin shaft (34) downward. The pin shaft (34) presses the support plate (33) downward. The support plate (33) rotates relative to the axis of the open arc-shaped strip (31). At the same time, the support plate (33) drives the slider (32) to rotate relative to the axis of the open arc-shaped strip (31). The slider (32) drives the welding head (7) to rotate relative to the axis of the open arc-shaped strip (31). When the nut (37) of the vertical lead screw nut pair (36) moves to the lower limit position, the welding head (7) just rotates to the set position, thus forming an arc-shaped weld scar on the outer surface of the U-shaped part (5), and then welding the two U-shaped parts (5) of the connecting piece (3) to the two anchor bolts (2) respectively, so as to finally weld a connecting piece (3) between the outer ends of the two anchor bolts (2); S9. Workers repeat the operations in steps S1 to S8 multiple times, and a connecting piece (3) can be welded between the outer ends of every two adjacent anchor bolts (2).

Images