Efficient steel pipe welding device for guardrails

Abstract

The invention discloses an efficient steel pipe welding device for guardrails, and relates to the technical field of steel pipe welding, the efficient steel pipe welding device comprises steel pipe pretreatment equipment, steel pipe conveying equipment is further arranged in the steel pipe pretreatment equipment, and the efficient steel pipe welding device further comprises a bidirectional positioning mechanism arranged on one side of the steel pipe conveying equipment; the two-way positioning mechanism is arranged, the positions of the two steel pipes to be welded can be fixed, meanwhile, the two steel pipes can be kept in the same horizontal plane, welding defects such as incomplete fusion and slag inclusion are easily caused by position deviation, and when the positions of the two steel pipes are unstable, the situation that a gap is too large or too small possibly occurs in the welding process is avoided. An overlarge gap enables the electric arc to be difficult to effectively melt the base metal on the two sides, and the incomplete fusion defect is caused; and if the gap is too small, floating and discharging of slag are not facilitated, slag inclusion is easily formed, and therefore position deviation in the steel pipe welding process is avoided, and a welding seam can be more complete.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe welding, and particularly to an efficient steel pipe welding device for guardrails. Background Art

[0002] Welded steel pipes refer to steel pipes with seams on the surface, which are formed by bending steel strips or steel plates into circular, square and other shapes and then welding them together. In the process of welding steel pipes for guardrails in the prior art, due to the different sizes of guardrails, the sizes of the steel pipes used for welding will also change accordingly. Therefore, some steel pipes need to be welded together after production to adapt to guardrails of different sizes;

[0003] In the process of welding two steel pipes, the two steel pipes need to be aligned. In the prior art, multiple clamping plates distributed in a ring and end clamping plates are used in cooperation to position and clamp the outer walls of the steel pipes. However, in the actual clamping process, it is necessary for workers to cooperate to align the two steel pipes to be welded, and as the size and weight of the steel pipes increase, the alignment process will become more difficult;

[0004] In addition, misalignment of the two steel pipes will result in uneven heat input around the weld. During the welding process, the metal at the weld expands when heated and contracts when cooled. If the steel pipes are misaligned, one side of the weld may be heated earlier or more than the other side, which will cause uneven shrinkage of the steel pipes during the cooling process, resulting in bending deformation. In addition to bending deformation, misalignment of the steel pipes may also cause torsional deformation. When the thermal stress distribution on the steel pipes during welding is uneven, torsion will occur. Especially when welding long steel pipes, due to the certain deflection of the steel pipes themselves, misalignment will cause the position of the weld to deviate from the neutral axis of the steel pipes.

[0005] In view of this, in order to solve the above problems, we propose an efficient steel pipe welding device for guardrails. Summary of the Invention

[0006] Technical Problems to be Solved

[0007] In view of the deficiencies of the prior art, the present invention provides an efficient steel pipe welding device for guardrails to solve the problems raised in the above background art.

[0008] Technical Solutions

[0009] To achieve the above object, the present invention provides the following technical solutions: An efficient steel pipe welding device for guardrails includes a steel pipe pretreatment device, and a steel pipe conveying device is further arranged inside the steel pipe pretreatment device. A two-way positioning mechanism is also arranged on one side of the steel pipe conveying device;

[0010] The two-way positioning mechanism includes a positioning platform fixedly installed on the outer surface of one side of the steel pipe conveying equipment. Inside the positioning platform, there are symmetrically sliding-connected sliding platforms. On the outer surfaces of the tops of the sliding platforms, there are fixedly connected positioning rings. Inside the outer surfaces of the mutually remote sides of the positioning rings, there are rotatably connected toothed rings. On both side surfaces of the positioning platform, there are fixedly installed driving motors. The outer surface of the positioning ring is rotatably connected through a rotating member. One end of the rotating member penetrates and extends into the positioning ring. On the inner wall surface of the positioning ring, there is fixedly connected a moving track limiting member. One end of the rotating member extending into the positioning ring is rotatably connected to a driven sleeve. On the outer surface of the driven sleeve near the center of the positioning ring, there is a clamping member attached thereto.

[0011] Preferably, on the outer surface of the toothed ring near the positioning ring, there is fixedly connected an inclined tooth block. On the outer surface of the toothed ring far from the positioning ring, there is fixedly connected a tooth block. The output shaft end of the driving motor is fixedly connected to a driving gear, and the driving gear meshes with the tooth block fixedly connected to the outer surface of the toothed ring.

[0012] Preferably, there are multiple rotating members. The multiple rotating members are arranged in a circular array with reference to the center point of the positioning ring. On the outer surface of the outer end of the rotating member arranged outside the positioning ring, there is fixedly connected a bevel gear, and the bevel gear meshes with the inclined tooth block fixedly connected to the outer surface of the toothed ring. On the outer surface of the inner end of the rotating member arranged inside the positioning ring, there is a thread. The driven sleeve is slidably adapted to the rotating member through the thread provided on the outer surface of the rotating member. On the outer surface of the driven sleeve, there is fixedly connected a cylindrical rod. The driven sleeve is slidably connected inside the moving track limiting member through the cylindrical rod.

[0013] Preferably, the clamping member is inclined with respect to the horizontal plane at the bottom end of the driven sleeve, and the clamping member is inclined towards the center point of the positioning ring.

[0014] Preferably, it further includes a uniform fitting mechanism arranged on the clamping member;

[0015] The uniform fitting mechanism includes a connecting rod rotatably connected to the upper surface of one end of the clamping member. The connecting rod is rotatably connected to a positioning rotating frame at the end far from the clamping member. On the outer surface of the positioning rotating frame far from the connecting rod, there is rotatably connected a telescopic sleeve rod. At both ends of the bottom surface of the clamping member, there are fixedly connected fitting limiting members. At both bottoms of the positioning rotating frame, there are fixedly connected positioning springs. Inside one of the fitting limiting members, there is fixedly installed a telescopic switch.

[0016] Preferably, the connecting rod is arranged at the inclined end of the clamping member towards the center of the positioning ring. The middle of the positioning rotating frame is rotatably connected to the outer surface of the driven sleeve. The positioning rotating frame is parallel to the clamping member. The telescopic sleeve rod is rotatably connected to the outer surface of the clamping member at the end far from the positioning rotating frame. The positioning springs are fixedly connected to the outer surface of the clamping member at the ends far from the positioning rotating frame.

[0017] Preferably, a signal receiver is provided inside the drive motor, and a controller is provided inside the telescopic switch. The controller inside the telescopic switch is electrically connected to the signal receiver inside the drive motor, and the telescopic switch controls the drive motor to turn off.

[0018] Preferably, it further includes a moving mechanism provided on the positioning platform;

[0019] The moving mechanism includes a moving chute opened inside the positioning platform. A stepping motor is fixedly installed on one side wall of the moving chute. The output shaft of the stepping motor is fixedly connected to a bidirectional threaded rod. A cylindrical guide rod is fixedly connected to the inner wall of the moving chute on the side far from the stepping motor. A telescopic support platform is fixedly connected to the middle position of the moving chute.

[0020] Preferably, the bidirectional threaded rod is rotatably connected inside the moving chute. Threads are provided on the outer surfaces of both ends of the bidirectional threaded rod, and the thread directions at both ends are opposite. Both the bidirectional threaded rod and the cylindrical guide rod penetrate through the telescopic support platform.

[0021] Preferably, the sliding tables are all slidably connected to the inside of the positioning platform through the moving chute. One side of the sliding table is slidably connected to the outer surface of the bidirectional threaded rod, and the other side of the sliding table is slidably connected to the outer surface of the bidirectional threaded rod through the thread on the outer surface of the bidirectional threaded rod.

[0022] Advantageous Effects

[0023] Compared with the prior art, the present invention provides a high-efficiency steel pipe welding device for guardrails, which has the following advantageous effects:

[0024] Through the provided bidirectional positioning mechanism, the positions of two steel pipes to be welded can be fixed, and at the same time, the two steel pipes can be kept in the same horizontal plane. Position deviation is likely to cause welding defects such as lack of fusion and slag inclusion. When the positions of the two steel pipes are unstable, the gap may be too large or too small during the welding process. If the gap is too large, it is difficult for the arc to effectively melt the base metals on both sides, resulting in lack of fusion defects; if the gap is too small, it is not conducive to the floating and discharging of the slag, and slag inclusion is likely to form. Therefore, avoiding position deviation during the steel pipe welding process can make the weld more complete;

[0025] During the process of the inclined clamping member contacting the surface of the steel pipe to be welded, in the initial state, the clamping member can limit the track of the steel pipe to be welded, so that the butt joint between the two steel pipes to be welded is faster, quickly positioning the two steel pipes to be welded, avoiding deviation between the two steel pipes to be welded, and preventing the situation where the steel pipes to be welded need to be adjusted in position during the subsequent welding process;

[0026] Through the settings of the connecting rod, positioning rotating frame, telescopic sleeve and positioning spring, when clamping two steel pipes to be welded, a uniform clamping force can be applied to the surface of the steel pipes to be welded. When the clamping force is uniform, the steel pipes will not have small displacements or deformations due to uneven stress. In this way, the width of the weld formed by welding can be kept consistent. Uneven clamping force may cause local stress concentration in the steel pipes during welding, which may lead to defects such as cracks. However, a uniform clamping force can make the stress distribution on the steel pipes more uniform and reduce welding defects caused by stress concentration.

[0027] Through the setting of the telescopic switch, when the fitting limiting part is completely fitted with the surface of the steel pipe to be welded, the telescopic switch can electrically control the driving motor to turn off, so that the clamping parts in the bidirectional positioning mechanism stop moving towards the surface of the steel pipe to be welded, avoiding excessive clamping force applied by the clamping parts on the surface of the steel pipe to be welded. Excessive clamping force will cause the steel pipe to be subjected to a force beyond its elastic range, resulting in plastic deformation of the steel pipe. When the clamping force is too large, large stresses will be generated inside the steel pipe, and these stresses may be released during or after welding, leading to cracks in the steel pipe. Appropriate clamping force helps to avoid such situations.

[0028] Through the setting of the moving mechanism, the clamping positions of the two steel pipes to be welded can be adjusted. In actual applications, the length specifications of steel pipes are diverse. By adjusting the clamping positions to adapt to steel pipes of different lengths, the welding equipment or fixture can have a wider applicability. The clamping positions can be adjusted according to the actual situation to align the parts to be welded of the two steel pipes at appropriate positions, avoiding weld misalignment caused by differences in the lengths of the steel pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall external structure of the present invention;

[0030] Figure 2 is a schematic diagram of the positional relationship at the telescopic support platform of the present invention;

[0031] Figure 3 is of the present invention Figure 2 schematic diagram of the structure from another perspective;

[0032] Figure 4 is a schematic diagram of the connection relationship at the positioning ring of the present invention;

[0033] Figure 5 is a schematic sectional view of the positioning ring of the present invention;

[0034] Figure 6 is of the present invention Figure 5 schematic enlarged view of the structure at A in;

[0035] Figure 7 Schematic diagram of the connection relationship at the rotating part of the present invention;

[0036] Figure 8 The present invention Figure 7 Enlarged schematic diagram of the structure at position B in the present invention;

[0037] Figure 9 Schematic diagram of the positional relationship at the driving motor of the present invention.

[0038] In the figure: 11, steel pipe pretreatment equipment; 12, steel pipe conveying equipment;

[0039] 21, positioning platform; 22, sliding table; 23, positioning ring; 24, toothed ring; 25, driving motor; 26, rotating part; 27, moving track limiting part; 28, driven sleeve; 29, clamping part;

[0040] 31, connecting rod; 32, positioning rotating frame; 33, telescopic sleeve rod; 34, fitting limiting part; 35, positioning spring; 36, telescopic switch;

[0041] 41, moving chute; 42, stepping motor; 43, bidirectional threaded rod; 44, cylindrical guide rod; 45, telescopic support platform. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiments of the present invention

[0044] Please refer to Figures 1 to 9 , a high-efficiency steel pipe welding device for guardrails, including steel pipe pretreatment equipment 11, and a steel pipe conveying equipment 12 is further provided inside the steel pipe pretreatment equipment 11. A two-way positioning mechanism is also provided on one side of the steel pipe conveying equipment 12;

[0045] The two-way positioning mechanism includes a positioning platform 21 fixedly installed on the outer surface of one side of the steel pipe conveying device 12. Inside the positioning platform 21, there are symmetrically sliding-connected sliding platforms 22. On the outer surfaces of the tops of the sliding platforms 22, there are fixedly connected positioning rings 23. Inside the outer surfaces of the mutually remote sides of the positioning rings 23, there are rotationally connected toothed rings 24. On both side surfaces of the positioning platform 21, there are fixedly installed driving motors 25. The outer surface of the positioning ring 23 is rotationally connected through a rotating member 26. One end of the rotating member 26 penetrates and extends into the positioning ring 23. On the inner wall surface of the positioning ring 23, there is fixedly connected a moving track limiting member 27. One end of the rotating member 26 extending into the positioning ring 23 is rotationally connected to a driven sleeve 28. Closely attached to the outer surface of one end of the driven sleeve 28 close to the center of the positioning ring 23, there is a clamping member 29.

[0046] Among them, on the outer surface of the toothed ring 24 close to the positioning ring 23, there is fixedly connected an inclined tooth block. On the outer surface of the toothed ring 24 remote from the positioning ring 23, there is fixedly connected a tooth block. The output shaft end of the driving motor 25 is fixedly connected with a driving gear, and the driving gear meshes with the tooth block fixedly connected to the outer surface of the toothed ring 24.

[0047] Among them, there are multiple rotating members 26. The multiple rotating members 26 are arranged in a circular array with the center point of the positioning ring 23 as a reference. On the outer surfaces of the outer ends of the rotating members 26 arranged outside the positioning ring 23, there are fixedly connected bevel gears, and the bevel gears mesh with the inclined tooth blocks fixedly connected to the outer surface of the toothed ring 24. On the outer surface of one end of the rotating member 26 arranged inside the positioning ring 23, there is a thread. The driven sleeve 28 is slidably adapted to the rotating member 26 through the thread provided on the outer surface of the rotating member 26. On the outer surface of the driven sleeve 28, there is fixedly connected a cylindrical rod. The driven sleeve 28 is slidably connected inside the moving track limiting member 27 through the cylindrical rod.

[0048] Among them, the clamping member 29 is in an inclined state with respect to the horizontal plane at the bottom end of the driven sleeve 28, and the clamping member 29 is inclined towards the center point of the positioning ring 23.

[0049] Further embodiments

[0050] Please refer to Figures 5 to 8 , the high-efficiency steel pipe welding device for guardrails further includes a uniform fitting mechanism arranged on the clamping member 29;

[0051] The uniform fitting mechanism includes a connecting rod 31 rotationally connected to the upper surface of one end of the clamping member 29. The end of the connecting rod 31 remote from the clamping member 29 is rotationally connected to a positioning rotating frame 32. On the outer surface of one side of the positioning rotating frame 32 remote from the connecting rod 31, there is rotationally connected a telescopic sleeve rod 33. At both ends of the bottom surface of the clamping member 29, there are fixedly connected fitting limiting members 34. At both bottoms of the positioning rotating frame 32, there are fixedly connected positioning springs 35. Inside one of the fitting limiting members 34, there is fixedly installed a telescopic switch 36.

[0052] Among them, the connecting rod 31 is arranged at one end of the clamping member 29 inclined towards the center of the positioning ring 23. The middle part of the positioning rotating frame 32 is rotatably connected to the outer surface of the driven sleeve 28. The positioning rotating frame 32 is parallel to the clamping member 29. One end of the telescopic sleeve rod 33 far from the positioning rotating frame 32 is rotatably connected to the outer surface of the clamping member 29. One end of the positioning spring 35 far from the positioning rotating frame 32 is fixedly connected to the outer surface of the clamping member 29.

[0053] Among them, a signal receiver is arranged inside the driving motor 25, and a controller is arranged inside the telescopic switch 36. The controller inside the telescopic switch 36 is electrically connected to the signal receiver inside the driving motor 25, and the telescopic switch 36 controls the driving motor 25 to turn off.

[0054] Further embodiments

[0055] Please refer to Figures 1 to 3 , the high-efficiency steel pipe welding device for guardrails further includes a moving mechanism arranged on the positioning platform 21;

[0056] The moving mechanism includes a moving chute 41 opened in the positioning platform 21. A stepping motor 42 is fixedly installed on one side wall of the moving chute 41. The output shaft of the stepping motor 42 is fixedly connected to a bidirectional threaded rod 43. A cylindrical guide rod 44 is fixedly connected to the inner wall of the moving chute 41 on the side far from the stepping motor 42. A telescopic support platform 45 is fixedly connected to the middle position of the moving chute 41.

[0057] Among them, the bidirectional threaded rod 43 is rotatably connected inside the moving chute 41. Threads are provided on the outer surfaces of both ends of the bidirectional threaded rod 43, and the thread directions of both ends are opposite. Both the bidirectional threaded rod 43 and the cylindrical guide rod 44 penetrate through the telescopic support platform 45.

[0058] Among them, the sliding tables 22 are all slidably connected to the inside of the positioning platform 21 through the moving chute 41. One side of the sliding table 22 is slidably connected to the outer surface of the bidirectional threaded rod 43, and the other side of the sliding table 22 is threadedly slidably connected to the outer surface of the bidirectional threaded rod 43 through the outer surface of the bidirectional threaded rod 43.

[0059] Among them, a control platform is arranged on the telescopic support platform 45, and the top surface of the telescopic support platform 45 is arc-shaped. The control platform can be controlled by the staff to raise or lower the telescopic support platform 45 according to the distance between the steel pipe to be welded and the ground.

[0060] The working process and principle of the overall content of the above embodiments are as follows:

[0061] Transportation of the steel pipe to be welded:

[0062] The staff places the steel pipe to be welded on the steel pipe conveying device 12, and then starts the steel pipe pretreatment device 11 to pre-treat the steel pipe to be welded, including operations such as cleaning and grinding the outer surface of the steel pipe. Then, the staff turns on the motor arranged inside the steel pipe conveying device 12, so that the steel pipe to be welded is smoothly conveyed to the welding position through the conveying rollers arranged inside the steel pipe conveying device 12;

[0063] It should be noted that both the steel pipe pretreatment device 11 and the steel pipe conveying device 12 are existing devices, so no more details will be given here.

[0064] Clamping and fixing of the steel pipe to be welded:

[0065] After being conveyed by the steel pipe conveying device 12, the steel pipe to be welded will enter the central part of the positioning ring 23. And with the continuous conveying of the steel pipe conveying device 12, the surface of the steel pipe to be welded will contact the upper surface of the telescopic support platform 45. It should be noted that a control platform is arranged on the telescopic support platform 45, and the top surface of the telescopic support platform 45 is arc-shaped. The control platform can, under the control of the staff, control the telescopic support platform 45 to rise or fall according to the distance between the steel pipe to be welded and the ground, so that the top surface of the telescopic support platform 45 fits the surface of the round steel pipe to be welded;

[0066] With the continuous conveying of the steel pipe to be welded, the previous section of the steel pipe to be welded will enter the center of the positioning ring 23 on the left, and the latter section of the steel pipe to be welded will be at the center of the positioning ring 23 on the right. At this time, the contact position of the two sections of the steel pipe to be welded is above the middle of the telescopic support platform 45;

[0067] During the above process, as the steel pipe to be welded advances, then the staff controls the driving motor 25 to start through an external controller. The driving gear fixedly connected to the output shaft end of the driving motor 25 will rotate accordingly. And because the driving gear meshes with the tooth blocks fixedly connected to the outer surface of the tooth ring 24, the start of the driving motor 25 will drive the tooth ring 24 to rotate inside the positioning ring 23. In addition, a helical tooth block is fixedly connected to the other side surface of the tooth ring 24, and the bevel gear fixedly connected to the outer surface of the rotating part 26 meshes with the helical tooth block. Therefore, the rotation of the tooth ring 24 will drive the rotating part 26 to rotate inside the positioning ring 23 through the meshing of the helical tooth block and the bevel gear;

[0068] With the rotation of the rotating part 26, the threads arranged on the outer surface of the rotating part 26 will move accordingly. Therefore, the driven sleeve 28 threadedly connected to the outer surface of the rotating part 26 through the threads will be affected by the rotating part 26 and move. And because a cylindrical rod slidably connected to the inside of the movement track limiting part 27 is arranged on the outer surface of the driven sleeve 28, the movement of the driven sleeve 28 will be restricted by the movement track limiting part 27 and can only move in the vertical direction;

[0069] With the movement of the driven sleeve 28, the clamping member 29 disposed below the driven sleeve 28 will approach towards the center of the positioning ring 23 until it contacts the outer surface of the steel pipe to be welded. Since there are multiple rotating members 26, moving trajectory limiting members 27, driven sleeves 28, and clamping members 29 arranged with reference to the center of the positioning ring 23, the multiple clamping members 29 will move synchronously according to the above steps to clamp the outer surface of the steel pipe to be welded;

[0070] During the above process, since the clamping member 29 is arranged to be inclined towards the center of the positioning ring 23, the end of the clamping member 29 closer to the center of the positioning ring 23 will first contact the outer surface of the steel pipe to be welded. At this time, the continuous movement of the clamping member 29 will be subject to a reverse force from the outer surface of the steel pipe to be welded. Since both ends of the clamping member 29 are rotatably connected to the connecting rod 31 and the telescopic sleeve rod 33 respectively, and both the connecting rod 31 and the telescopic sleeve rod 33 are rotatably connected to the outer surface of the driven sleeve 28 through the positioning rotating frame 32 at the ends away from the clamping member 29, the clamping member 29 will cause the positioning rotating frame 32 to deflect with its connection point with the driven sleeve 28 as the fulcrum;

[0071] At this time, the originally inclined positioning rotating frame 32 will also rotate accordingly, and the positioning rotating frame 32 will gradually change from an inclined state to a horizontal state. At this time, the two positioning springs 35 arranged on the lower surface of the positioning rotating frame 32 will be compressed accordingly;

[0072] It should be noted that during the above process, as the clamping member 29 tends to be horizontal, the whole clamping member 29 will gradually contact and fit with the outer surface of the steel pipe to be welded until the outer surface of the steel pipe to be welded is clamped. And since the lower surfaces of both ends of the clamping member 29 are fixedly connected with the fitting limiting members 34, the fitting limiting members 34 will also contact the outer surface of the steel pipe to be welded;

[0073] Due to the clamping member 29, the fitting limiting member 34 provided with the telescopic switch 36 will gradually contact the surface of the steel pipe to be welded during the process of the clamping member 29 changing from inclined to horizontal, and will contact during the rotation of the clamping member 29. At this time, the telescopic switch 36 arranged inside the fitting limiting member 34 will be squeezed by the outer surface of the steel pipe to be welded and thus retract into the fitting limiting member 34;

[0074] Since a signal receiver is provided in the drive motor 25, a controller is provided in the telescopic switch 36, and the controller in the telescopic switch 36 is electrically connected to the signal receiver in the drive motor 25, and the telescopic switch 36 controls the drive motor 25 to turn off. Therefore, after the telescopic switch 36 is completely retracted into the fitting limiting member 34, the controller provided inside the telescopic switch 36 will send a signal, and the signal receiver provided inside the drive motor 25 will receive the signal, thereby controlling the drive motor 25 to turn off. In this state, the fixed rotating member 26 that is controlled by the drive motor 25 to move will stop rotating, and the clamping member 29 and the fitting limiting member 34 will no longer move toward the outer surface of the steel pipe to be welded;

[0075] It should be noted that when the positioning rotating frame 32 is in a horizontal state, the positioning spring 35 provided between the positioning rotating frame 32 and the clamping member 29 will be compressed by the bidirectional action from the positioning rotating frame 32 and the clamping member 29. At the same time, the rebound force brought by the compression of the positioning spring 35 will also act on the surfaces of the positioning rotating frame 32 and the clamping member 29 synchronously, so as to make the clamping force applied by the clamping member 29 and the fitting limiting member 34 to the surface of the steel pipe to be welded uniform. Subsequently, the staff can quickly weld the two steel pipes to be welded together through an external welding robot;

[0076] Through the provided bidirectional positioning mechanism, the positions of the two steel pipes to be welded can be fixed, and at the same time, the two steel pipes can be kept in the same horizontal plane. Position deviation is likely to cause welding defects such as lack of fusion and slag inclusion. When the positions of the two steel pipes are unstable, the gap may be too large or too small during the welding process. A too large gap will make it difficult for the arc to effectively melt the base metals on both sides, resulting in lack of fusion defects; a too small gap is not conducive to the floating and discharging of the slag, and it is easy to form slag inclusion. Therefore, avoiding position deviation during the welding of steel pipes can make the weld more complete;

[0077] In addition, during the process of the inclined clamping member 29 contacting the surface of the steel pipe to be welded, the clamping member 29 can limit the track of the steel pipe to be welded in its initial state, so as to make the butt joint between the two steel pipes to be welded faster, quickly position the two steel pipes to be welded, and avoid deviation between the two steel pipes to be welded, so as to avoid the situation that the steel pipe to be welded needs to be adjusted in position during the subsequent welding process;

[0078] Meanwhile, through the settings of the connecting rod 31, the positioning rotating frame 32, the telescopic sleeve, and the positioning spring 35, when clamping two steel pipes to be welded, a uniform clamping force can be applied to the surface of the steel pipes to be welded. When the clamping force is uniform, the steel pipes will not have small displacements or deformations due to uneven forces. In this way, the width of the weld formed during welding can be kept consistent. Uneven clamping forces may cause local stress concentration in the steel pipes during welding, which may lead to defects such as cracks. However, a uniform clamping force can make the stress distribution on the steel pipes more uniform and reduce welding defects caused by stress concentration.

[0079] Through the setting of the telescopic switch 36, when the fitting limiting member 34 is completely fitted to the surface of the steel pipe to be welded, the telescopic switch 36 can electrically control the driving motor 25 to turn off, thereby causing the clamping member 29 in the bidirectional positioning mechanism to stop moving towards the surface of the steel pipe to be welded, avoiding the clamping force applied by the clamping member 29 on the surface of the steel pipe to be welded being too large. An excessive clamping force will cause the steel pipe to be subjected to a force beyond its elastic range, resulting in plastic deformation of the steel pipe. When the clamping force is too large, large stresses will be generated inside the steel pipe, and these stresses may be released during or after welding, causing cracks in the steel pipe. An appropriate clamping force helps to avoid such situations.

[0080] Adjustment of the clamping position of the steel pipe to be welded:

[0081] When welding steel pipes of different lengths, it is necessary to adjust the clamping position according to the length of the steel pipe. At this time, the staff can turn on the stepper motor 42. At this time, the bidirectional threaded rod 43 fixedly connected to the output shaft of the stepper motor 42 will rotate accordingly. Since the bidirectional threaded rod 43 is rotatably connected inside the moving chute 41, threads are provided on the outer surfaces of both ends of the bidirectional threaded rod 43, and the thread directions at both ends are opposite. The sliding tables 22 are all slidably connected inside the positioning platform 21 through the moving chute 41. One side of the sliding table 22 is slidably connected to the outer surface of the bidirectional threaded rod 43, and the other side of the sliding table 22 is threadedly slidably connected to the outer surface of the bidirectional threaded rod 43 through the outer surface of the bidirectional threaded rod 43. Therefore, the rotation of the bidirectional threaded rod 43 will cause the two sliding tables 22 to approach each other inside the moving chute 41. The movement of the sliding tables 22 inside the moving chute 41 will be restricted by the cylindrical guide rods 44 synchronously, thereby adjusting the distance between the two groups of clamping members 29 and changing the clamping position of the steel pipe to be welded. It should be noted that during the above process, the forward or reverse rotation of the stepper motor 42 will cause the bidirectional threaded rod 43 to rotate, and the rotation of the bidirectional threaded rod 43 will cause the sliding tables 22 to move in the opposite direction;

[0082] Through the setting of the moving mechanism, the clamping positions of the two steel pipes to be welded can be adjusted. In practical applications, the length specifications of steel pipes are diverse. By adjusting the clamping positions to adapt to steel pipes of different lengths, the welding equipment or fixture can have a wider applicability. Adjusting the clamping positions can, according to the actual situation, align the parts to be welded of the two steel pipes at appropriate positions, avoiding weld misalignment caused by the length difference of the steel pipes.

[0083] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0084] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency steel pipe welding device for guardrails, comprising a steel pipe pretreatment device (11), wherein a steel pipe conveying device (12) is also arranged inside the steel pipe pretreatment device (11), characterized in that: It also includes a bidirectional positioning mechanism arranged on one side of the steel pipe conveying equipment (12); The bidirectional positioning mechanism comprises a positioning platform (21) fixedly mounted on the outer surface of one side of the steel pipe conveying equipment (12); a slide (22) is symmetrically slidably connected inside the positioning platform (21); a positioning ring (23) is fixedly connected to the outer surface of the top of the slide (22); a gear ring (24) is rotatably connected to the inner surface of the outer surface of the positioning ring (23) on one side away from each other; a driving motor (25) is fixedly mounted on the two side surfaces of the positioning platform (21); a rotating member (26) is rotatably connected to the outer surface of the positioning ring (23); one end of the rotating member (26) penetrates and extends into the interior of the positioning ring (23); a moving track limiting member (27) is fixedly connected to the inner wall surface of the positioning ring (23); a driven sleeve (28) is rotatably connected to the outer surface of one end of the rotating member (26) extending into the interior of the positioning ring (23); a clamping member (29) is provided in close contact with the outer surface of one end of the driven sleeve (28) close to the center of the positioning ring (23).

2. The high-efficiency steel pipe welding device for guardrail according to claim 1 is characterized in that: A helical tooth block is fixedly connected to the outer surface of the gear ring (24) on the side close to the positioning circular ring (23), a tooth block is fixedly connected to the outer surface of the gear ring (24) on the side away from the positioning circular ring (23), and a driving gear is fixedly connected to the output shaft end of the driving motor (25), and the driving gear is meshed with the tooth block fixedly connected to the outer surface of the gear ring (24).

3. The high-efficiency steel pipe welding device for guardrail according to claim 2 is characterized in that: A plurality of rotating members (26) are provided, and the plurality of rotating members (26) are arranged in a circular array with the center point of the positioning ring (23) as a reference. The rotating members (26) are arranged on the outer surface of one end outside the positioning ring (23) and are fixedly connected with a bevel gear, and the bevel gear is meshed with a helical gear block fixedly connected to the outer surface of the gear ring (24). The rotating member (26) is arranged on the outer surface of one end inside the positioning ring (23) and is provided with a thread. The driven sleeve (28) is slidably matched with the rotating member (26) through the thread provided on the outer surface of the rotating member (26). The outer surface of the driven sleeve (28) is fixedly connected with a cylindrical rod, and the driven sleeve (28) is slidably connected to the inside of the moving track limiter (27) through the cylindrical rod.

4. The high-efficiency steel pipe welding device for guardrail according to claim 1 is characterized in that: The clamping member (29) is inclined relative to the horizontal plane at the bottom end of the driven sleeve (28), and the clamping member (29) is inclined toward the center point of the positioning ring (23).

5. The high-efficiency steel pipe welding device for guardrail according to claim 1 is characterized in that: It also includes a uniform fitting mechanism arranged on the clamping member (29); The uniform fitting mechanism comprises a connecting rod (31) rotatably connected to the upper surface of one end of the clamping member (29); an end of the connecting rod (31) away from the clamping member (29) is rotatably connected to a positioning rotating frame (32); an outer surface of the positioning rotating frame (32) away from the connecting rod (31) is rotatably connected to a telescopic sleeve rod (33); both ends of the bottom surface of the clamping member (29) are fixedly connected to fitting limiters (34); both bottoms of the two sides of the positioning rotating frame (32) are fixedly connected to positioning springs (35); and a telescopic switch (36) is fixedly installed inside one of the fitting limiters (34).

6. The high-efficiency steel pipe welding device for guardrail according to claim 1 is characterized in that: The connecting rod (31) is arranged at one end of the clamping member (29) which is inclined toward the center of the positioning ring (23); the middle part of the positioning rotating frame (32) is rotatably connected to the outer surface of the driven sleeve (28); the positioning rotating frame (32) is parallel to the clamping member (29); one end of the telescopic sleeve (33) away from the positioning rotating frame (32) is rotatably connected to the outer surface of the clamping member (29); and one end of the positioning spring (35) away from the positioning rotating frame (32) is fixedly connected to the outer surface of the clamping member (29).

7. The high-efficiency steel pipe welding device for guardrail according to claim 5, characterized in that: A signal receiver is arranged in the driving motor (25), and a controller is arranged in the telescopic switch (36). The controller in the telescopic switch (36) is electrically connected to the signal receiver in the driving motor (25), and the telescopic switch (36) controls the driving motor (25) to be turned off.

8. The high-efficiency steel pipe welding device for guardrail according to claim 1 is characterized in that: It also includes a moving mechanism disposed on the positioning platform (21); The moving mechanism comprises a moving slide groove (41) provided in the positioning platform (21); a stepping motor (42) is fixedly installed on a groove wall on one side of the moving slide groove (41); a bidirectional threaded rod (43) is fixedly connected to the output shaft of the stepping motor (42); a columnar guide rod (44) is fixedly connected to the side of the inner wall of the moving slide groove (41) away from the stepping motor (42); and a telescopic support platform (45) is fixedly connected to the middle position of the moving slide groove (41).

9. The high-efficiency steel pipe welding device for guardrails according to claim 8, characterized in that: The bidirectional threaded rod (43) is rotatably connected to the inside of the movable slide groove (41). The outer surfaces of both ends of the bidirectional threaded rod (43) are provided with threads, and the directions of the threads at both ends are opposite. The bidirectional threaded rod (43) and the columnar guide rod (44) both penetrate the telescopic support platform (45).

10. The high-efficiency steel pipe welding device for guardrail according to claim 9, characterized in that: The slides (22) are slidably connected to the interior of the positioning platform (21) via a movable slide groove (41), one side of the slides (22) is slidably connected to the outer surface of the bidirectional threaded rod (43), and the other side of the slides (22) is slidably connected to the outer surface of the bidirectional threaded rod (43) via threads on the outer surface of the bidirectional threaded rod (43).

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