CN210306462U

CN210306462U - Pressing device of air pressure butt welding machine

Info

Publication number: CN210306462U
Application number: CN201921146716.7U
Authority: CN
Inventors: 朱炳华
Original assignee: Lin'an Huaguan Furniture Co Ltd
Current assignee: Lin'an Huaguan Furniture Co Ltd
Priority date: 2019-07-20
Filing date: 2019-07-20
Publication date: 2020-04-14
Anticipated expiration: 2029-07-20

Abstract

The utility model relates to a compressing device of a pneumatic butt welder, which comprises a base plate, a first compressing component, a second compressing component and a driving component for driving the second compressing component to slide, wherein the first compressing component comprises a first connecting plate, a first mounting plate, a first clamp fixed on the first mounting plate, a second clamp connected with the first mounting plate in a sliding way, a first fixing plate fixed on the first mounting plate and a first bolt connected with the first fixing plate in a threaded way, and the first bolt is fixed with the second clamp; the second compresses tightly the subassembly including with second connecting plate, second mounting panel, fix the third anchor clamps on the second mounting panel, with second mounting panel sliding connection's fourth anchor clamps, fix the second fixed plate on the second mounting panel and with second fixed plate threaded connection's second bolt, the second bolt is fixed with the fourth anchor clamps. The utility model discloses a press from both sides tight reinforcing bar and compress tightly the reinforcing bar, avoid the reinforcing bar to remove to the welding process, improve the welding effect of reinforcing bar.

Description

Pressing device of air pressure butt welding machine

Technical Field

The utility model belongs to the technical field of the technique of reinforcing bar atmospheric pressure butt welder and specifically relates to a closing device of atmospheric pressure butt welder is related to.

Background

The steel bar joints are heated by oxygen and acetylene flames, pressure is applied when the temperature reaches a plastic state, and the process of pressing the steel bar joints together is the gas pressure welding, and the gas pressure welding is mainly used for the butt welding of the construction thread steel bars and the butt welding of train rails at the present stage. Two reinforcing bars need compress tightly or press from both sides tightly through closing device before the welding, when guaranteeing that the reinforcing bar bears the biggest axial pressure in welding process, can not take place relative slip between reinforcing bar and the closing device, guarantee welded position's accuracy and welded fastness.

Chinese patent with publication number CN206561185U discloses a reinforcing bar air pressure butt welder, including welding jig, many mouthfuls of ring canal heaters and the air feeder that provides fuel to many mouthfuls of ring canal heaters, welding jig is connected with the presser, welding jig includes the anchor clamps shell, the welding has the handle on the anchor clamps shell, anchor clamps shell one side is fixed interface, the last third recess that has three evenly distributed of fixed interface, be provided with support frame and the fixed bolster of sliding on the same axis of anchor clamps shell below, support frame and the fixed bolster of sliding are the arc structure, there are two through holes in the middle of the arc structure, the equal threaded connection in through hole both sides has the bolt to be used for fixing the reinforcing bar, through adjusting bolt, can weld different direct reinforcing bars.

The above prior art solutions have the following drawbacks: the reinforcing bar supports tightly through the bolt of two relative settings in arc structure only, because of the bolt tip is the plane, and the reinforcing bar side is the arc, and area of contact between bolt and the reinforcing bar is little, and atmospheric pressure is big, and the axial pressure that the reinforcing bar bore is big, takes place to slide between bolt and the reinforcing bar, leads to welding position inaccurate, influences welding quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a closing device of atmospheric pressure butt welder can press from both sides tight reinforcing bar, avoids the reinforcing bar to remove welding process, improves the welding effect of reinforcing bar.

The above technical purpose of the present invention can be achieved by the following technical solutions: a compressing device of an air pressure butt welder comprises a base plate, a first compressing assembly arranged on the base plate, a second compressing assembly in sliding connection with the base plate and a driving assembly for driving the second compressing assembly to slide, wherein the first compressing assembly comprises a first connecting plate fixed on the base plate and perpendicular to the upper end face of the base plate, a first mounting plate fixed with the first connecting plate, a first clamp fixed at one end, close to the first connecting plate, of the first mounting plate, a second clamp in sliding connection with the first mounting plate, a first fixing plate fixed at one end, far away from the first connecting plate, of the first mounting plate and a first bolt in threaded connection with the first fixing plate, and the first bolt is fixed with the second clamp; the second compresses tightly the subassembly and includes the second connecting plate with base plate sliding connection, with the fixed second mounting panel of second connecting plate, fix the third anchor clamps that the second mounting panel is close to second connecting plate one end, with second mounting panel sliding connection's fourth anchor clamps, fix the second mounting panel and keep away from the second fixed plate of second connecting plate one end and with second fixed plate threaded connection's second bolt, the second bolt with fourth anchor clamps are fixed.

By adopting the technical scheme, two steel bars to be welded are respectively compressed by the first compressing assembly and the second compressing assembly and then welded, wherein one steel bar is placed between the first clamp and the second clamp, and the first bolt is rotated to drive the second clamp plate to slide towards the direction close to the first clamp plate, so that the steel bars are clamped; and another steel bar is placed between the third clamp and the fourth clamp, and the second bolt is rotated to drive the fourth clamp to slide towards the direction close to the third clamp so as to clamp the steel bar. After two are all compressed tightly, move to the direction that is close to first connecting plate through drive assembly drive second connecting plate for two reinforcing bar contacts, thereby weld.

The utility model discloses further set up to: the first clamp comprises a first plate body and a first arc-shaped groove formed in the first plate body, and the length direction of the first arc-shaped groove is consistent with the length direction of the steel bar; the second clamp comprises a second plate body and a second arc-shaped groove formed in the second plate body, and the length direction of the second arc-shaped groove is consistent with that of the reinforcing steel bar.

Through adopting above-mentioned technical scheme, when the second plate body is close to first plate body, reinforcing bar one side and first arc wall butt, opposite side and second arc wall butt, area of contact between reinforcing bar and first plate body and the second plate body is big, so realizes the chucking of reinforcing bar. The first clamp and the second clamp can press steel bars and other sections with circular cross sections and can also press plate-shaped steel.

The utility model discloses further set up to: the third clamp comprises a third plate body and a third arc-shaped groove arranged on the third plate body, and the arrangement direction of the third arc-shaped groove is consistent with the length direction of the steel bar; the fourth clamp comprises a fourth plate body and a fourth arc-shaped groove arranged on the fourth plate body, and the arrangement direction of the fourth arc-shaped groove is consistent with the length direction of the reinforcing steel bar.

Through adopting above-mentioned technical scheme, when the fourth plate body is close to the third plate body, reinforcing bar one side and third arc wall butt, opposite side and fourth arc wall butt realize the chucking of reinforcing bar. The third clamp and the fourth clamp can compress the steel bars and can also compress the plate-shaped steel.

The utility model discloses further set up to: a first sliding groove is formed in the first mounting plate along the length direction of the first mounting plate, the section of the first sliding groove is T-shaped, and a first sliding block in sliding fit with the first sliding groove is fixed at the lower end of the second plate body; a second sliding groove is formed in the second mounting plate along the length direction of the second mounting plate, the section of the second sliding groove is T-shaped, and a second sliding block in sliding fit with the second sliding groove is fixed to the lower end of the fourth plate body.

Through adopting above-mentioned technical scheme, first slider and first spout sliding fit guarantee that the second plate body smoothly slides on first mounting panel, and first spout is opened and is established to the T type for first slider can not break away from first spout. The second sliding block is in sliding fit with the second sliding groove, the fourth plate body is guaranteed to slide smoothly on the second mounting plate, the second sliding groove is arranged in a T shape, and the second sliding block cannot be separated from the second sliding groove.

The utility model discloses further set up to: be provided with first bearing subassembly in the first spout, first bearing subassembly is including placing the first connecting block in first spout, fixing the first dead lever on first connecting block and fixing the first bearing board in first dead lever upper end, first bearing board is the arc, the length of first connecting block with the inside width of first spout is the same, its width with the width of first spout opening part is the same.

Through adopting above-mentioned technical scheme, when pressing from both sides the great reinforcing bar of tight diameter, reinforcing bar self gravity is too big, leads to the reinforcing bar can move slightly downwards, sets up first bearing subassembly, and the reinforcing bar can be placed on first bearing board, avoids the reinforcing bar to take place to remove. The reinforcing bar that presss from both sides tight diameter is little, avoids first bearing subassembly influence first anchor clamps and the tight of clamp of second anchor clamps, and first connecting block rotates 90 degrees and can takes out from first spout.

The utility model discloses further set up to: the second supporting component is arranged in the second sliding groove and comprises a second connecting block placed in the second sliding groove, a second fixing rod fixed on the second connecting block and a second supporting plate fixed at the upper end of the second fixing rod, the second supporting plate is an arc-shaped plate, the length of the second connecting block is equal to the width of the inside of the second sliding groove, and the width of the second connecting block is equal to the width of the opening of the second sliding groove.

Through adopting above-mentioned technical scheme, when pressing from both sides the great reinforcing bar of tight diameter, reinforcing bar self gravity is too big, leads to the reinforcing bar can move slightly downwards, sets up second bearing subassembly, and the reinforcing bar can be placed on second bearing board, avoids the reinforcing bar to take place to remove. The reinforcing steel bar that presss from both sides tight diameter is little, avoids second bearing subassembly influence third anchor clamps and the tight of clamp of fourth anchor clamps, and the second connecting block rotates 90 degrees and can takes out from the second spout.

The utility model discloses further set up to: the driving assembly comprises a vertical plate fixed at one end of the base plate far away from the first connecting plate, guide rods symmetrically arranged at two sides of the base plate along the length direction of the base plate and a screw rod penetrating through the vertical plate and rotatably connected with the vertical plate, one end of each guide rod is fixed with the vertical plate, the other end of each guide rod is fixed with the first connecting plate, and the guide rods penetrate through the second connecting plate and are in sliding connection with the second connecting plate; the screw rod is in threaded connection with the second connecting plate, and one end, far away from the vertical plate, of the screw rod is rotatably connected with the first connecting plate.

Through adopting above-mentioned technical scheme, the drive lead screw rotates, and the second connecting plate with lead screw threaded connection can't rotate under the spacing of guide arm, only can slide along the length direction of guide arm. After the reinforcing bar compresses tightly, through rotating the lead screw, adjust the distance between second connecting plate and the first connecting plate for two welded reinforcing bars are close to each other, remove to the welding point and stop, weld the reinforcing bar again.

The utility model discloses further set up to: and a hand wheel for driving the screw rod to rotate is fixed at the end part of the screw rod.

Through adopting above-mentioned technical scheme, rotate the hand wheel, conveniently drive the lead screw and rotate to the drive second connecting plate slides at lead screw length direction.

To sum up, the utility model discloses a beneficial technological effect does:

1. one steel bar is placed between the first clamp and the second clamp, and the first bolt is rotated to drive the second clamping plate to slide towards the direction close to the first clamping plate, so that the steel bar is clamped; another reinforcing steel bar is placed between the third clamp and the fourth clamp, the second bolt is rotated to drive the fourth clamp to slide towards the direction close to the third clamp, the reinforcing steel bar is clamped, and after the two reinforcing steel bars are compressed, the second connecting plate is driven by the driving assembly to move towards the direction close to the first connecting plate, so that the two reinforcing steel bars are contacted, and welding is performed;

2. the first chute is arranged to be T-shaped, so that the first sliding block is prevented from being separated from the first chute, and the second plate body is prevented from being separated from the first mounting plate;

3. set up first bearing subassembly and second bearing subassembly, can avoid the reinforcing bar to move down under self action of gravity or the welding pressure effect, first connecting block conveniently takes out and installs with the second connecting block, can not influence the clamp of reinforcing bar tightly.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

figure 2 is a schematic view of a first support assembly of the present invention;

figure 3 is a schematic view of a second support assembly of the present invention.

Reference numerals: 1. a substrate; 2. a first hold-down assembly; 21. a first connecting plate; 22. a first mounting plate; 221. a first chute; 23. a first clamp; 231. a first plate body; 232. a first arc-shaped slot; 24. a second clamp; 241. a second plate body; 242. a second arc-shaped slot; 243. a first slider; 25. a first fixing plate; 26. a first bolt; 3. a second hold-down assembly; 31. a second connecting plate; 32. a second mounting plate; 321. a second chute; 33. a third clamp; 331. a third plate body; 332. a third arc-shaped slot; 34. a fourth clamp; 341. a fourth plate body; 342. a fourth arc-shaped groove; 343. a second slider; 35. a second fixing plate; 36. a second bolt; 4. a drive assembly; 41. a vertical plate; 42. a guide bar; 43. a screw rod; 431. a hand wheel; 5. a first support member; 51. a first connection block; 52. a first fixing lever; 53. a first support plate; 6. a second support member; 61. a second connecting block; 62. a second fixing bar; 63. a second support plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a closing device of atmospheric pressure butt welder, including base plate 1, set up the first subassembly 2 that compresses tightly on base plate 1, compress tightly subassembly 3 and drive the second with base plate 1 sliding connection's second and compress tightly the gliding drive assembly 4 of subassembly 3. The base plate 1 is in a shape of a rectangular parallelepiped plate, and the length direction of the base plate 1 is consistent with the length direction of the reinforcing steel bars.

As shown in fig. 1, the first pressing assembly 2 includes a first connecting plate 21, a first mounting plate 22, a first clamp 23, a second clamp 24, a first fixing plate 25 and a first bolt 26, the first connecting plate 21 is fixed at one end of the base plate 1, and the first connecting plate 21 is perpendicular to the base plate 1. The first mounting plate 22 is parallel to the substrate 1, the first mounting plate 22 is fixed to one end of the first mounting plate 21, the first clamp 23 is fixed to one end of the first mounting plate 22 close to the first mounting plate 21, and the second clamp 24 is slidably connected to the first mounting plate 22. The first fixing plate 25 is fixed at one end of the first mounting plate 22 far away from the first connecting plate 21, the first fixing plate 25 is perpendicular to the first mounting plate 22, the first bolt 26 is in threaded connection with the first fixing plate 25, and the first bolt 26 penetrates through one end of the first fixing plate 25 and is fixed with the second clamp 24. By turning the first bolt 26, the distance between the first clamp 23 and the second clamp 24 can be adjusted, thereby facilitating clamping of bars of different diameters.

As shown in fig. 2, the first clamp 23 includes a first plate 231 and a first arc-shaped groove 232 disposed on the first plate 231, the first plate 231 is fixed to the first connection plate 21 and perpendicular to the first connection plate 21, the first arc-shaped groove 232 is disposed on an end surface of the first plate 231 opposite to the second clamp 24, and a length direction of the first arc-shaped groove is the same as a length direction of the steel bar. The second clamp 24 includes a second plate 241 and a second arc-shaped slot 242 opened on the second plate 241, and the second arc-shaped slot 242 is parallel to the first arc-shaped slot 232. When second plate body 241 is close to first plate body 231, reinforcing bar one side and first arc wall 232 butt, opposite side and second arc wall 242 butt, area of contact between reinforcing bar and first plate body 231 and the second plate body 241 is big, so realizes the chucking of reinforcing bar. The first clamp 23 and the second clamp 24 can press steel bars and other sectional materials with circular cross sections, and can also press plate-shaped steel materials. The first mounting plate 22 is provided with a first sliding groove 221 along the length direction thereof, the cross section of the first sliding groove 221 is T-shaped, and a first sliding block 243 in sliding fit with the first sliding groove 221 is fixed at the bottom end of the second plate 241. The first sliding block 243 is in sliding fit with the first sliding groove 221 to ensure that the second plate 241 slides smoothly on the first mounting plate 22, and the first sliding groove 221 is formed in a T shape, so that the first sliding block 243 cannot be separated from the first sliding groove 221.

As shown in fig. 2, a first supporting member 5 is disposed in the first sliding groove 221, the first supporting member 5 includes a first connecting block 51, a first fixing rod 52 and a first supporting plate 53, the first connecting block 51 is disposed in the first sliding groove 221, a length of the first connecting block 51 is the same as a width of the inside of the first sliding groove 221, and a width of the first connecting block is the same as a width of an opening of the first sliding groove 221. The first fixing rod 52 is perpendicular to the upper end surface of the first connecting block 51 and fixed on the upper end surface of the first connecting block 51, the first supporting plate 53 is an arc-shaped plate, and the first supporting plate 53 is fixed at the upper end of the first fixing rod 52. When pressing from both sides the great reinforcing bar of tight diameter, reinforcing bar self gravity is too big, leads to the reinforcing bar to move slightly downwards, sets up first bearing subassembly 5, and the reinforcing bar can be placed on first bearing board 53, avoids the reinforcing bar to take place to remove. To avoid the first supporting member 5 from affecting the clamping between the first clamp 23 and the second clamp 24, the first connecting block 51 can be taken out of the first sliding groove 221 by rotating 90 degrees.

As shown in fig. 1, the second pressing assembly 3 includes a second connecting plate 31, a second mounting plate 32, a third clamp 33, a fourth clamp 34, a second fixing plate 35, and a second bolt 36, and the second connecting plate 31 is parallel to the first connecting plate 21. The second mounting plate 32 is fixed at one end of the second connecting plate 31 and located on the same side of the substrate 1 as the first mounting plate 22, the third clamp 33 is fixed at one end of the second mounting plate 32 close to the second connecting plate 31, and the fourth clamp 34 is slidably connected with the second mounting plate 32. The second fixing plate 35 is fixed at one end of the second mounting plate 32 far away from the second connecting plate 31, the second fixing plate 35 is perpendicular to the second mounting plate 32, the second bolt 36 is in threaded connection with the second fixing plate 35, and the second bolt 36 penetrates through one end of the second fixing plate 35 and is fixed with the fourth clamp 34. By turning the second bolt 36, the distance between the third clamp 33 and the fourth clamp 34 can be adjusted, thereby facilitating clamping of bars of different diameters.

As shown in fig. 3, the third clamp 33 includes a third plate 331 and a third arc-shaped groove 332 formed in the third plate 331, the third plate 331 is fixed to the second connecting plate 31 and perpendicular to the second connecting plate 31, the third arc-shaped groove 332 is formed in an end surface of the third plate 331 opposite to the fourth clamp 34, and a length direction of the third arc-shaped groove is the same as a length direction of the steel bar. The fourth clamp 34 includes a fourth plate 341 and a fourth arc-shaped slot 342 formed on the fourth plate 341, and the fourth arc-shaped slot 342 is parallel to the third arc-shaped slot 332. When the fourth plate 341 is close to the third plate 331, one side of the steel bar abuts against the third arc-shaped groove 332, and the other side of the steel bar abuts against the fourth arc-shaped groove 342, so that the steel bar is clamped. The third and

fourth clamps

33 and 34 can press the steel bars and also press the plate-shaped steel. A second sliding groove 321 is formed in the second mounting plate 32 along the length direction thereof, the section of the second sliding groove 321 is T-shaped, and a second slider 343 in sliding fit with the second sliding groove 321 is fixed on the bottom surface of the fourth plate 341. The second sliding block 343 is in sliding fit with the second sliding groove 321, so that the fourth plate 341 can slide smoothly on the second mounting plate 32, and the second sliding groove 321 is set to be T-shaped, so that the second sliding block 343 cannot be separated from the second sliding groove 321.

As shown in fig. 3, a second supporting member 6 is disposed in the second sliding groove 321, the second supporting member 6 includes a second connecting block 61, a second fixing rod 62 and a second supporting plate 63, the second connecting block 61 is disposed in the second sliding groove 321, and the length of the second connecting block 61 is the same as the width of the inside of the second sliding groove 321, and the width of the second connecting block is the same as the width of the opening of the first sliding groove 221. The second fixing rod 62 is perpendicular to the upper end surface of the second connecting block 61 and is fixed on the upper end surface of the second connecting block 61, the second supporting plate 63 is an arc-shaped plate, and the second supporting plate 63 is fixed on the upper end of the second fixing rod 62. When pressing from both sides the great reinforcing bar of tight diameter, reinforcing bar self gravity is too big, leads to the reinforcing bar to move slightly downwards, sets up second bearing subassembly 6, and the reinforcing bar can be placed on second bearing board 63, avoids the reinforcing bar to take place to remove. To avoid the second supporting member 6 from affecting the clamping between the third clamp 33 and the fourth clamp 34, the second connecting block 61 can be taken out from the second sliding groove 321 by rotating 90 degrees.

As shown in fig. 1, the driving assembly 4 includes a vertical plate 41, two guide rods 42 and a screw rod 43, the vertical plate 41 is fixed at one end of the substrate 1 far from the first connecting plate 21, and the two guide rods 42 are respectively disposed at two sides of the substrate 1. One end of the guide rod 42 is fixed to the vertical plate 41, the other end is fixed to the first connecting plate 21, and the second connecting plate 31 penetrates through the guide rod 42 and is slidably connected with the guide rod 42. One end of the screw rod 43 is rotatably connected with the vertical plate 41, the other end of the screw rod 43 is rotatably connected with the first connecting plate 21, the screw rod 43 passes through the second connecting plate 31 and is in threaded connection with the second connecting plate 31, and a hand wheel 431 for driving the screw rod 43 to rotate is fixed at one end of the screw rod 43 close to the vertical plate 41. The screw rod 43 is driven to rotate, and the second connecting plate 31 which is in threaded connection with the screw rod 43 cannot rotate under the limit of the guide rod 42 and can only slide along the length direction of the guide rod 42. After the reinforcing bar compresses tightly, through rotating lead screw 43, adjust the distance between second connecting plate 31 and the first connecting plate 21 for two welded reinforcing bars are close to each other, remove to the welding point and stop, weld the reinforcing bar again.

The implementation principle of the embodiment is as follows: two steel bars to be welded are respectively pressed by the first pressing component 2 and the second pressing component 3 and then welded, wherein one steel bar is placed between the first clamp 23 and the second clamp 24, and the first bolt 26 is rotated to drive the second clamp plate to slide towards the direction close to the first clamp plate, so that the steel bars are clamped; another bar is placed between the third clamp 33 and the fourth clamp 34 and rotation of the second bolt 36 causes the fourth clamp 34 to slide in a direction closer to the third clamp 33, clamping the bar. After the two steel bars are all compressed, the screw rod 43 is driven to rotate, so that the second connecting plate 31 is driven to move towards the direction close to the first connecting plate 21, and the two steel bars are in contact with each other to be welded.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a closing device of atmospheric pressure butt welder, includes base plate (1), set up first compress tightly subassembly (2) on base plate (1), compress tightly subassembly (3) and drive second with base plate (1) sliding connection's second and compress tightly gliding drive assembly (4) of subassembly (3), its characterized in that: the first pressing assembly (2) comprises a first connecting plate (21) fixed on the base plate (1) and perpendicular to the upper end face of the base plate (1), a first mounting plate (22) fixed with the first connecting plate (21), a first clamp (23) fixed at one end, close to the first connecting plate (21), of the first mounting plate (22), a second clamp (24) connected with the first mounting plate (22) in a sliding mode, a first fixing plate (25) fixed at one end, far away from the first connecting plate (21), of the first mounting plate (22) and a first bolt (26) in threaded connection with the first fixing plate (25), and the first bolt (26) is fixed with the second clamp (24); the second compresses tightly subassembly (3) including with base plate (1) sliding connection's second connecting plate (31), with second connecting plate (31) fixed second mounting panel (32), fix third anchor clamps (33) that second mounting panel (32) are close to second connecting plate (31) one end, with second mounting panel (32) sliding connection's fourth anchor clamps (34), fix second fixed plate (35) of keeping away from second connecting plate (31) one end in second mounting panel (32) and with second fixed plate (35) threaded connection's second bolt (36), second bolt (36) with fourth anchor clamps (34) are fixed.

2. The pressing device of a gas-pressure butt welder according to claim 1, characterized in that: the first clamp (23) comprises a first plate body (231) and a first arc-shaped groove (232) formed in the first plate body (231), and the length direction of the first arc-shaped groove (232) is consistent with that of the reinforcing steel bar; the second clamp (24) comprises a second plate body (241) and a second arc-shaped groove (242) formed in the second plate body (241), and the length direction of the second arc-shaped groove (242) is consistent with the length direction of the steel bar.

3. The pressing device of a gas butt welder according to claim 2, characterized in that: the third clamp (33) comprises a third plate body (331) and a third arc-shaped groove (332) formed in the third plate body (331), and the forming direction of the third arc-shaped groove (332) is consistent with the length direction of the steel bar; the fourth clamp (34) comprises a fourth plate body (341) and a fourth arc-shaped groove (342) formed in the fourth plate body (341), and the forming direction of the fourth arc-shaped groove (342) is consistent with the length direction of the reinforcing steel bar.

4. The pressing device of a gas-pressure butt welder according to claim 3, characterized in that: a first sliding groove (221) is formed in the first mounting plate (22) along the length direction of the first mounting plate, the section of the first sliding groove (221) is T-shaped, and a first sliding block (243) in sliding fit with the first sliding groove (221) is fixed at the lower end of the second plate body (241); a second sliding groove (321) is formed in the second mounting plate (32) along the length direction of the second mounting plate, the section of the second sliding groove (321) is T-shaped, and a second sliding block (343) in sliding fit with the second sliding groove (321) is fixed to the lower end of the fourth plate body (341).

5. The pressing device of a gas-pressure butt welder according to claim 4, characterized in that: be provided with first bearing subassembly (5) in first spout (221), first bearing subassembly (5) are including placing first connecting block (51) in first spout (221), fixing first dead lever (52) on first connecting block (51) and fixing first bearing board (53) in first dead lever (52) upper end, first bearing board (53) are the arc, the length of first connecting block (51) with the inside width of first spout (221) is the same, its width with the width of first spout (221) opening part is the same.

6. The pressing device of a gas-pressure butt welder according to claim 4, characterized in that: be provided with second bearing subassembly (6) in second spout (321), second bearing subassembly (6) are including placing second connecting block (61) in second spout (321), fixing second dead lever (62) on second connecting block (61) and fixing second bearing board (63) in second dead lever (62) upper end, second bearing board (63) are the arc, the length of second connecting block (61) with the inside width of second spout (321) is the same, its width with the width of second spout (321) opening part is the same.

7. The pressing device of a gas-pressure butt welder according to claim 1, characterized in that: the driving assembly (4) comprises a vertical plate (41) fixed at one end of the base plate (1) far away from the first connecting plate (21), guide rods (42) symmetrically arranged at two sides of the base plate (1) along the length direction of the base plate (1) and a screw rod (43) penetrating through the vertical plate (41) and rotatably connected with the vertical plate (41), one end of each guide rod (42) is fixed with the vertical plate (41), the other end of each guide rod is fixed with the first connecting plate (21), and each guide rod (42) penetrates through the second connecting plate (31) and is slidably connected with the second connecting plate (31); the screw rod (43) is in threaded connection with the second connecting plate (31), and one end, far away from the vertical plate (41), of the screw rod (43) is rotatably connected with the first connecting plate (21).

8. The pressing device of a gas butt welder according to claim 7, wherein: and a hand wheel (431) for driving the screw rod (43) to rotate is fixed at the end part of the screw rod.