CN216177868U - Vertical automatic pipeline welding machine - Google Patents

Abstract

Vertical automatic pipeline welding machine, including vertical support, vertical gear motor, three-jaw chuck, first support, the second support, the alignment jig, control actuating cylinder and welder, bottom concentric fixed connection of three-jaw chuck is in vertical gear motor's power shaft upper end, first support is L template structure, the curb plate right side edge of first support and the curb plate rear side edge body coupling of first support, first support fixed connection is at vertical support, the curb plate leading flank of first support is along controlling direction fixedly connected with forked tail slide rail, second support sliding connection is on forked tail slide rail, control actuating cylinder fixed connection at the right side edge of first support, control the piston rod left end fixed connection of actuating cylinder on the right side of second support, the bottom of alignment jig is provided with fixture, welder's handle fixation clamp is established on fixture. The utility model has scientific design, reasonable structure, high automation degree, time and labor saving, low labor intensity and high efficiency, and can ensure the welding quality.

Description

Vertical automatic pipeline welding machine

Technical Field

The utility model relates to the field of welding equipment, in particular to a vertical automatic pipeline welding machine.

Background

The traditional longer metal pipe is generally formed by welding two or more pipelines, manual operation is usually adopted when two pipelines are welded, one hand continuously rotates two pipelines which are connected in advance through spot welding, the other hand holds a welding gun to spot-weld the two pipelines together, the welding quality cannot be guaranteed, time and labor are wasted, the labor intensity is high, and the efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a vertical automatic pipeline welding machine which is scientific in design, reasonable in structure, capable of guaranteeing the welding quality, high in automation degree, time-saving, labor-saving, low in labor intensity and high in efficiency.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the vertical automatic pipeline welding machine comprises a vertical support, a vertical speed reducing motor, a three-jaw chuck, a first support, a second support, an adjusting frame, a left adjusting cylinder, a right adjusting cylinder and a welding gun, wherein the vertical support and the vertical speed reducing motor are both fixedly arranged on the ground, the vertical support is positioned on the right side of the vertical speed reducing motor, the three-jaw chuck is horizontally arranged, the bottom of the three-jaw chuck is concentrically and fixedly connected to the upper end of a power shaft of the vertical speed reducing motor, the first support is of an L-shaped plate structure, the first support is vertically arranged along the left and right directions and is positioned on the front side of the vertical support, the right side edge of a rear side plate of the first support is integrally connected with the rear side edge of a right side plate of the first support, the first support is fixedly connected to the vertical support and is higher than the three-jaw chuck, the front side surface of the rear side plate of the first support is fixedly connected with a dovetail slide rail along the left and right directions, the second support is slidably connected to the dovetail slide rail, the left adjusting cylinder is horizontally arranged along the left and right direction and is fixedly connected to the right side surface of the right side plate of the first support, the piston rod of the left and right adjusting cylinders extends leftwards and penetrates through the right side plate of the first support, the left end of the piston rod of the left and right adjusting cylinders is fixedly connected to the right side of the second support, the welding gun is arranged in the left and right directions, the bottom of the adjusting frame is provided with a clamping mechanism, a handle fixing clamp of the welding gun is arranged on the clamping mechanism, and the gun head of the welding gun is arranged towards the center of the three-jaw chuck downwards in the left direction.

The vertical support comprises a base and a vertical strip support plate, the base is fixed on the ground, two T-shaped grooves which are arranged at intervals left and right are vertically arranged on the front side surface and the rear side surface of the vertical strip plate, four strip runway holes which are distributed in a rectangular shape and are through front and back are arranged on the rear side plate of the first support, the length of each strip runway hole is the same as the distance between the two corresponding T-shaped grooves left and right, T-shaped nuts are arranged in the two T-shaped grooves on the front side in a sliding manner, fastening bolts are respectively arranged in the two corresponding strip runway holes on the upper side and the upper side in a penetrating manner, the fastening bolts on the upper side are positioned at the left side part of the strip runway hole on the upper side, and the inner ends of the fastening bolts are in threaded connection with the T-shaped nuts on the left side, the fastening bolts on the lower side are positioned at the right side part of the long runway hole on the lower side, the inner ends of the fastening bolts are in threaded connection with the T-shaped nuts on the right side, and the nuts of the two fastening bolts tightly press the front side face of the rear side plate of the first support.

The alignment jig includes first horizontal pole, the second horizontal pole, first montant and second montant, first horizontal pole sets up along the fore-and-aft direction level, the second horizontal pole sets up along left right direction level, the rear end fixed connection of first horizontal pole is on the leading flank of second support, the upper end fixedly connected with suit of first montant is the first staple bolt sleeve on first horizontal pole, the lower extreme fixedly connected with second staple bolt sleeve of first montant, the telescopic central line of second staple bolt sets up along controlling direction level, the concentric setting of running through of second horizontal pole is in the second staple bolt sleeve, the left end fixedly connected with third staple bolt sleeve of second horizontal pole, the telescopic central line of third staple bolt is along vertical setting, the upper portion concentric rotation of second montant sets up in the third staple bolt sleeve, fixture fixed connection is at the lower extreme of second montant.

The clamping mechanism comprises two cuboid clamping blocks, a first screw rod and a second screw rod, the two cuboid clamping blocks are horizontally arranged along the left-right direction and are arranged at intervals up and down, the front side part of the cuboid clamping block at the upper side and the front side part of the cuboid clamping block at the lower side are both provided with an upper side, a first U-shaped groove with an open lower side and an open front side, the rear side part of the cuboid clamping block at the lower side is provided with a second U-shaped groove with an open lower side and an open rear side, the first screw rod and the second screw rod are both vertically arranged, the upper end of the first screw rod upwards passes through the rear side part of the cuboid clamping block at the upper side and is in threaded connection with a first fastening nut, the lower side surface of the first fastening nut is tightly pressed on the upper side surface of the cuboid clamping block at the upper side, the lower end of the first screw rod is hinged in the second U-shaped groove, the upper end of the second screw rod is hinged in the first U-shaped groove at the upper side, the lower side part of the second screw rod is clamped in the first U-shaped groove at the lower side, the lower extreme of second screw rod is located the below and the threaded connection of the cuboid clamp splice of downside has second fastening nut, and second fastening nut's the side of going up tightly presses the downside at the cuboid clamp splice of downside, and the downside middle part of the cuboid clamp splice of upside and the side of going up of the cuboid clamp splice of downside middle part all are provided with the arc groove clamp face, and welder's handle clamp is established between two arc groove clamp faces.

Compared with the prior art, the utility model has substantive characteristics and progress, and specifically, the working principle of the utility model is as follows: firstly, two pipelines to be welded are coaxially butted and spot-welded at a plurality of points along a groove weld at the butt joint, so that the two pipelines are preliminarily connected together, then the two pipelines are vertically placed, the lower end part of the lower pipeline is fixedly clamped at the center of a three-jaw chuck, then a second fastening nut is screwed off, the front side part of the lower cuboid clamping block is turned downwards, the two cuboid clamping blocks are opened, a handle of a welding gun is placed between the two cuboid clamping blocks, a gun head of the welding gun is arranged towards the left lower part and opposite to the center of the three-jaw chuck, then the lower cuboid clamping block is turned upwards, the lower side part of a second screw rod is clamped in a first U-shaped groove at the lower side, the second fastening nut is screwed at the lower end of a second screw rod, the upper side surface of the second fastening nut is tightly pressed on the lower side surface of the lower clamping block, and the handle of the welding gun is tightly clamped between two arc groove clamping surfaces, then adjusting the adjusting frame according to the position of the butt joint of the gun head of the welding gun and the two pipelines, unscrewing the first anchor ear sleeve, enabling the first vertical rod, the second horizontal rod, the second vertical rod, the clamping mechanism and the welding gun to move back and forth on the first horizontal rod along with the first anchor ear sleeve, enabling the welding gun to correspond to the two pipelines left and right, screwing down the first anchor ear sleeve, unscrewing the two fastening bolts, enabling the first support, the left and right adjusting cylinders, the adjusting frame and the welding gun to integrally move up and down along the two T-shaped grooves on the front side surface of the vertical strip-shaped support plate, enabling the gun head of the welding gun to be just as high as the butt joint of the two pipelines, enabling the first support to finely adjust a certain angle up and down, ensuring that the gun head of the welding gun and the two pipelines form a certain angle, screwing down the two fastening bolts, fixing the first support on the front side surface of the vertical strip-shaped support plate, unscrewing the second anchor ear sleeve, enabling the second horizontal rod to move up and down, The second vertical rod, the clamping mechanism and the welding gun move left and right together, so that the gun head of the welding gun is close to the butt joint of the two pipelines and is positioned on the right side of the butt joint of the two pipelines, then the second hoop sleeve is screwed down, then the third hoop sleeve is unscrewed, the second vertical rod, the clamping mechanism and the welding gun are rotated, the gun head of the welding gun just corresponds to the butt joint close to the two pipelines in the left and right directions, then the third hoop sleeve is screwed down, then the vertical speed reducing motor is started, the power shaft of the vertical speed reducing motor drives the three-jaw chuck to rotate slowly, the three-jaw chuck drives the two pipelines to rotate slowly, the welding machine is started simultaneously, the gun head of the welding gun starts to perform welding operation on the butt joint of the two pipelines, so that one circle of the butt joint of the two pipelines is welded into a whole uniformly, the automation degree is high, the welding quality is excellent, time and labor is saved, the labor intensity is low, the efficiency is high, after the welding of the two pipelines is completed, take off two pipelines from the three-jaw chuck, install two other pipelines that have already welded again, alright continue to carry out welding operation to two other pipelines, if the diameter grow of pipeline or when diminishing, then only need through controlling the piston rod of adjusting cylinder and stretching out and drawing back about, alright make first regulation seat remove about on the forked tail slide rail, and then make the whole and welder of alignment jig remove about together, and then ensure that the rifle head of welder keeps the adjacent state of certain distance with the butt joint of two pipelines all the time, and then guarantee welding quality.

The utility model has scientific design, reasonable structure, high automation degree, time and labor saving, low labor intensity and high efficiency, and can ensure the welding quality.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is a left side view of the clamping mechanism of the present invention.

Fig. 4 is a rear view of the clamping mechanism of the present invention.

Fig. 5 is a front view of the clamping mechanism of the present invention.

Fig. 6 is a partially enlarged view of a portion a in fig. 1.

Detailed Description

The embodiments of the present invention are further described below with reference to the drawings.

As shown in fig. 1-6, the vertical automatic pipeline welding machine comprises a vertical support, a vertical speed reducing motor 1, a three-jaw chuck 2, a first support 3, a second support 4, an adjusting frame 5, a left and right adjusting cylinder 6 and a welding gun 7, wherein the vertical support and the vertical speed reducing motor 1 are both fixedly arranged on the ground, the vertical support is positioned on the right side of the vertical speed reducing motor 1, the three-jaw chuck 2 is horizontally arranged, the bottom of the three-jaw chuck 2 is concentrically and fixedly connected to the upper end of a power shaft of the vertical speed reducing motor 1, the first support 3 is of an L-shaped plate structure, the first support 3 is vertically arranged along the left and right direction and is positioned on the front side of the vertical support, the right side of a rear side plate of the first support 3 is integrally connected with the rear side of the right side plate of the first support 3, the first support 3 is fixedly connected to the vertical support and is higher than the three-jaw chuck 2, the front side of the rear side plate of the first support 3 is fixedly connected with a dovetail slide rail 8 along the left and right direction, second support 4 sliding connection is on forked tail slide rail 8, control actuating cylinder 6 along left right direction level setting and fixed connection at the right side board right flank of first support 3, control the piston rod of actuating cylinder 6 and stretch out left and pass the right side board of first support 3, control the piston rod left end fixed connection of actuating cylinder 6 on the right side of second support 4, welder 7 sets up along left right direction, the bottom of alignment jig 5 is provided with fixture, welder 7's handle fixation clamp is established on fixture, welder 7's rifle head sets up towards the center of three-jaw chuck 2 down left side.

The vertical support comprises a base 9 and a vertical strip support plate 10, the base 9 is fixed on the ground, the front side surface and the back side surface of the vertical strip plate are vertically provided with two T-shaped grooves 11 which are spaced from each other at left and right, the back side plate of the first support 3 is provided with four strip runway holes 12 which are distributed in a rectangular shape and are through front and back, the length of each strip runway hole 12 is the same as the distance between the two corresponding T-shaped grooves 11 at left and right, T-shaped nuts 29 are arranged in the two T-shaped grooves 11 at the front side in a sliding manner, fastening bolts 13 are respectively arranged in the two corresponding strip runway holes 12 at upper and lower sides in a penetrating manner, the fastening bolt 13 at the upper side is positioned at the left side part of the strip runway hole 12 at the upper side, and the inner end of the fastening bolt is in the T-shaped nut 29 at left side, the lower fastening bolt 13 is positioned at the right side part of the lower long runway hole 12, the inner end of the lower fastening bolt is screwed in the right T-shaped nut 29, and the nuts of the two fastening bolts 13 are tightly pressed on the front side surface of the rear side plate of the first support 3.

The adjusting bracket 5 comprises a first cross bar 14, a second cross bar 15, a first vertical bar 16 and a second vertical bar 17, the first cross bar 14 is horizontally arranged along the front-back direction, the second cross bar 15 is horizontally arranged along the left-right direction, the rear end of the first cross bar 14 is fixedly connected on the front side surface of the second support 4, the upper end of the first vertical bar 16 is fixedly connected with a first hoop sleeve 18 sleeved on the first cross bar 14, the lower end of the first vertical bar 16 is fixedly connected with a second hoop sleeve 19, the central line of the second hoop sleeve 19 is horizontally arranged along the left-right direction, the second cross bar 15 is concentrically arranged in the second hoop sleeve 19 in a penetrating way, the left end fixedly connected with third staple bolt sleeve 20 of second horizontal pole 15, the central line of third staple bolt sleeve 20 is along vertical setting, and the lateral part concentric rotation of going up of second montant 17 sets up in third staple bolt sleeve 20, and fixture fixed connection is at the lower extreme of second montant 17.

The clamping mechanism comprises two cuboid clamping blocks 21, a first screw rod 22 and a second screw rod 23, the two cuboid clamping blocks 21 are horizontally arranged along the left-right direction and are arranged at intervals up and down, the front side part of the cuboid clamping block 21 at the upper side and the front side part of the cuboid clamping block 21 at the lower side are both provided with upper sides, first U-shaped grooves 24 with both open lower sides and front sides are respectively formed, the rear side part of the cuboid clamping block 21 at the lower side is provided with second U-shaped grooves 25 with both open lower sides and rear sides, the first screw rod 22 and the second screw rod 23 are both vertically arranged, the upper end of the first screw rod 22 upwards penetrates through the rear side part of the cuboid clamping block 21 at the upper side and is in threaded connection with a first fastening nut 26, the lower side surface of the first fastening nut 26 is tightly pressed on the upper side surface of the cuboid clamping block 21 at the upper side, the lower end of the first screw rod 22 is hinged in the second U-shaped grooves 25, the upper end of the second screw rod 23 is hinged in the first U-shaped grooves 24 at the upper side, the lower side portion card of second screw 23 is established in first U type groove 24 of downside, and the lower extreme of second screw 23 is located the below of cuboid clamp splice 21 of downside and threaded connection has second fastening nut 27, and the side of going up of second fastening nut 27 sticiss at the downside of cuboid clamp splice 21 of downside, and the downside middle part of cuboid clamp splice 21 of upside and the side of going up of cuboid clamp splice 21 of downside middle part all are provided with arc slot clamping face 28, and welder 7's handle presss from both sides and establishes between two arc slot clamping face 28.

The first anchor ear sleeve 18, the second anchor ear sleeve 19 and the third anchor ear sleeve 20 are conventional devices, and are commercially available, and the specific structure and the working principle are not described again.

The working principle of the utility model is as follows: firstly, two pipelines to be welded are coaxially butted in the same axial direction and are spot-welded at a plurality of points along a groove weld at the butt joint, so that the two pipelines are preliminarily connected together, then the two pipelines are vertically placed, the lower end part of the pipeline at the lower side is fixedly clamped at the center of the three-jaw chuck 2, then the second fastening nut 27 is screwed off, the front side part of the cuboid clamping block 21 at the lower side is downwards overturned, the two cuboid clamping blocks 21 are opened, the handle of the welding gun 7 is placed between the two cuboid clamping blocks 21, the welding gun 7 is arranged facing to the center of the three-jaw chuck 2 towards the left lower part of the gun head, then the cuboid clamping block 21 at the lower side is upwards overturned, the lower side part of the second screw 23 is clamped in the first U-shaped groove 24 at the lower side, then the second fastening nut 27 is screwed at the lower end of the second screw 23, so that the upper side surface of the second fastening nut 27 is tightly pressed on the lower side surface of the cuboid clamping block 21 at the lower side, the handle of the welding gun 7 is tightly clamped between the two arc groove clamping surfaces 28, then the adjusting frame 5 is adjusted according to the position of the butt joint of the gun head of the welding gun 7 and the two pipelines, the first anchor ear sleeve 18 is unscrewed, the first vertical rod 16, the second horizontal rod 15, the second vertical rod 17, the clamping mechanism and the welding gun 7 can move back and forth on the first horizontal rod 14 along with the first anchor ear sleeve 18, so that the welding gun 7 corresponds to the two pipelines left and right, then the first anchor ear sleeve 18 is screwed down, the two fastening bolts 13 are unscrewed, the first support 3, the left and right adjusting cylinder 6, the adjusting frame 5 and the welding gun 7 integrally move up and down along the two T-shaped grooves 11 on the front side surface of the vertical strip support plate 10, so that the gun head of the welding gun 7 is just as high as the butt joint of the two pipelines, a certain angle can be finely adjusted up and down on the first support 3, and the gun head of the welding gun 7 is ensured to be at a certain angle with the two pipelines, then two fastening bolts 13 are screwed down, the first support 3 is fixed on the front side surface of the vertical strip support plate 10, the second hoop sleeve 19 is unscrewed, the second cross rod 15, the second vertical rod 17, the clamping mechanism and the welding gun 7 move left and right, the gun head of the welding gun 7 is close to the butt joint of the two pipelines and is positioned on the right side of the butt joint of the two pipelines, the second hoop sleeve 19 is screwed down, the third hoop sleeve 20 is unscrewed, the second vertical rod 17, the clamping mechanism and the welding gun 7 are rotated, the gun head of the welding gun 7 is just close to the butt joint of the two pipelines in the left and right directions, the third hoop sleeve 20 is screwed down, then the vertical speed reducing motor 1 is started, the power shaft of the vertical speed reducing motor 1 drives the three-jaw chuck 2 to rotate slowly, the three-jaw chuck 2 drives the two pipelines to rotate slowly, the welding machine is started simultaneously, the gun head of the welding gun 7 starts to weld the butt joint of the two pipelines, make the even welding of a week of butt joint department of two pipelines integrative, degree of automation is high, welding quality is excellent, time saving and labor saving, low in labor strength, high efficiency, after two pipeline welding are accomplished, take off two pipelines from three-jaw chuck 2, install two other pipeline of spot welding again, alright continue to carry out welding operation to two other pipelines, if the diameter grow of pipeline or when diminishing, then only need through controlling the piston rod of adjusting cylinder 6 and stretch out and draw back about, alright make first regulation seat remove about on dovetail slide rail 8, and then make the adjusting bracket 5 whole and welder 7 remove about together, and then ensure that the rifle head of welder 7 keeps the adjacent state of certain distance with the butt joint department of two pipelines all the time, and then guarantee welding quality.

The above embodiments are merely to illustrate rather than to limit the technical solutions of the present invention, and although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model and it is intended to cover in the claims the utility model as defined in the appended claims.

Claims (4)

1. Vertical automatic pipeline welding machine, its characterized in that: the welding device comprises a vertical support, a vertical speed reducing motor, a three-jaw chuck, a first support, a second support, an adjusting frame, a left adjusting cylinder, a right adjusting cylinder and a welding gun, wherein the vertical support and the vertical speed reducing motor are both fixedly arranged on the ground, the vertical support is positioned on the right side of the vertical speed reducing motor, the three-jaw chuck is horizontally arranged, the bottom of the three-jaw chuck is concentrically and fixedly connected to the upper end of a power shaft of the vertical speed reducing motor, the first support is of an L-shaped plate structure, the first support is vertically arranged along the left-right direction and is positioned on the front side of the vertical support, the right side edge of a rear side plate of the first support is integrally connected with the rear side edge of a right side plate of the first support, the first support is fixedly connected to the vertical support and is higher than the three-jaw chuck, a dovetail slide rail is fixedly connected to the front side surface of the rear side plate of the first support along the left-right direction, the second support is slidably connected to the dovetail slide rail, the left adjusting cylinder is horizontally arranged along the left-right direction and is fixedly connected to the right side surface of the right side plate of the first support, the piston rod of the left and right adjusting cylinders extends leftwards and penetrates through the right side plate of the first support, the left end of the piston rod of the left and right adjusting cylinders is fixedly connected to the right side of the second support, the welding gun is arranged in the left and right directions, the bottom of the adjusting frame is provided with a clamping mechanism, a handle fixing clamp of the welding gun is arranged on the clamping mechanism, and the gun head of the welding gun is arranged towards the center of the three-jaw chuck downwards in the left direction.

2. The vertical automated pipe welder of claim 1, wherein: the vertical support comprises a base and a vertical strip support plate, the base is fixed on the ground, two T-shaped grooves which are arranged at intervals left and right are vertically arranged on the front side surface and the rear side surface of the vertical strip plate, four strip runway holes which are distributed in a rectangular shape and are through front and back are arranged on the rear side plate of the first support, the length of each strip runway hole is the same as the distance between the two corresponding T-shaped grooves left and right, T-shaped nuts are arranged in the two T-shaped grooves on the front side in a sliding manner, fastening bolts are respectively arranged in the two corresponding strip runway holes on the upper side and the upper side in a penetrating manner, the fastening bolts on the upper side are positioned at the left side part of the strip runway hole on the upper side, and the inner ends of the fastening bolts are in threaded connection with the T-shaped nuts on the left side, the fastening bolts on the lower side are positioned at the right side part of the long runway hole on the lower side, the inner ends of the fastening bolts are in threaded connection with the T-shaped nuts on the right side, and the nuts of the two fastening bolts tightly press the front side face of the rear side plate of the first support.

3. The vertical automated pipe welder of claim 2, wherein: the alignment jig includes first horizontal pole, the second horizontal pole, first montant and second montant, first horizontal pole sets up along the fore-and-aft direction level, the second horizontal pole sets up along left right direction level, the rear end fixed connection of first horizontal pole is on the leading flank of second support, the upper end fixedly connected with suit of first montant is the first staple bolt sleeve on first horizontal pole, the lower extreme fixedly connected with second staple bolt sleeve of first montant, the telescopic central line of second staple bolt sets up along controlling direction level, the concentric setting of running through of second horizontal pole is in the second staple bolt sleeve, the left end fixedly connected with third staple bolt sleeve of second horizontal pole, the telescopic central line of third staple bolt is along vertical setting, the upper portion concentric rotation of second montant sets up in the third staple bolt sleeve, fixture fixed connection is at the lower extreme of second montant.

4. The vertical automated pipe welder of claim 3, wherein: the clamping mechanism comprises two cuboid clamping blocks, a first screw rod and a second screw rod, the two cuboid clamping blocks are horizontally arranged along the left-right direction and are arranged at intervals up and down, the front side part of the cuboid clamping block at the upper side and the front side part of the cuboid clamping block at the lower side are both provided with an upper side, a first U-shaped groove with an open lower side and an open front side, the rear side part of the cuboid clamping block at the lower side is provided with a second U-shaped groove with an open lower side and an open rear side, the first screw rod and the second screw rod are both vertically arranged, the upper end of the first screw rod upwards passes through the rear side part of the cuboid clamping block at the upper side and is in threaded connection with a first fastening nut, the lower side surface of the first fastening nut is tightly pressed on the upper side surface of the cuboid clamping block at the upper side, the lower end of the first screw rod is hinged in the second U-shaped groove, the upper end of the second screw rod is hinged in the first U-shaped groove at the upper side, the lower side part of the second screw rod is clamped in the first U-shaped groove at the lower side, the lower extreme of second screw rod is located the below and the threaded connection of the cuboid clamp splice of downside has second fastening nut, and second fastening nut's the side of going up tightly presses the downside at the cuboid clamp splice of downside, and the downside middle part of the cuboid clamp splice of upside and the side of going up of the cuboid clamp splice of downside middle part all are provided with the arc groove clamp face, and welder's handle clamp is established between two arc groove clamp faces.

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