CN116532905A - Welding device for cylindrical thin-wall high-pressure-resistant shell - Google Patents

Abstract

The invention discloses a welding device for a cylindrical thin-wall high-pressure-resistant shell, and relates to the technical field of welding; the rotary table comprises a base, wherein the base is connected with a side plate, a rotary seat and a surrounding seat; a welding piece is arranged on the base in a sliding manner; the rotary seat is rotatably provided with a supporting component, the supporting component comprises a supporting outer cylinder, the circumference of the supporting outer cylinder is slidably provided with supporting plates which are distributed in a circular array, and both sides of one supporting plate are respectively provided with traction pieces; the thin-wall plate is round and surrounds the supporting plate, and two ends of the thin-wall plate are limited and fixed through traction pieces on the supporting plate; the side plates are provided with butt joint pieces for butt joint one end of the thin-wall plate to one of the traction pieces on the supporting plate; a surrounding piece is rotatably arranged on the surrounding seat and is used for surrounding the thin-wall plate on the supporting plate; the invention has the butt joint function, realizes circular butt joint of the thin-wall plates, has internal support and completes the welding process.

Description

A cylindrical thin-walled high-pressure shell welding device

technical field

The invention relates to the field of welding technology, in particular to a cylindrical thin-walled high-pressure shell welding device.

Background technique

Cylindrical thin-walled shells are generally formed by bending butt joints of thin-walled plates, which are generally fixed by welding; for circular thin-walled shells, it is necessary to bend and butt square thin-walled plates, and then Welding and fixing; at this time, it is necessary to support and fix the butt circular plates from the inside, otherwise there is no supporting area, the welding cannot be successfully performed, and it cannot be guaranteed that the thin-walled plates can remain circular after welding; the existing welding equipment is in When welding thin-walled circular shells, when the two ends of the plates are butted, the operation is cumbersome and the butt joint efficiency is low; the Chinese invention patent with the publication number CN110328473A discloses a circular shell welding device, and its technical proposal is as follows: Cylinders, welding machines, sliders, welding heads, rotary welding modules, workbenches, and machine bases. From the content of the records, the patent realizes the automatic welding of circular shells, but it cannot connect thin-walled plates into circular shells. shape, and cannot support the inside, therefore, the above-mentioned technical problems have not been solved.

Contents of the invention

In view of the above technical problems, the present invention can realize the welding of circular thin-walled shell parts, and has a butt joint function, realizes circular butt joint of thin-walled plates, has internal support, and completes the welding process.

The technical solution used in the present invention is: a cylindrical thin-walled high-pressure resistant shell welding device, including a base, the base is connected with side plates, a rotating seat and a surrounding seat; a welding piece is slid on the base; a rotating seat is installed on the rotating seat There is a support assembly, the support assembly includes a support outer cylinder, and support plates arranged in a circular array are slidably arranged on the circumference of the support outer cylinder, and traction pieces are respectively arranged on both sides of one of the support plates; sliding inside the support outer cylinder An extrusion column is installed, and a contact slant plate is connected to the extrusion column, and the contact slant plate is used to push the support plate to slide radially; an auxiliary support rod is installed between two adjacent support plates; the thin-walled plate is circular Surrounded on the support plate, and the two ends of the thin-walled plate are limited and fixed by the traction piece on the support plate; the auxiliary support rod is used for auxiliary support of the thin-walled plate; butt joints are provided on the side plate for One end of the thin-walled plate is butted to one of the traction pieces on the support plate; the butt joint includes a butt plate slidingly installed on the side plate, the traction piece is arranged on the butt plate, and the traction piece and the cutting piece are set on the side plate , the cut-off piece is used to cut off the thin-walled plate; a surrounding piece is rotated on the surrounding seat for surrounding the thin-walled plate on the support plate; the surrounding piece includes a surrounding ring gear rotatably installed on the surrounding seat, and the surrounding ring gear A connecting frame is connected to the inner side of the connecting frame, a radial sliding seat is slidably installed on the connecting frame, a rack seat is slidably installed on the radial sliding seat, and two clamping traction parts are arranged on the rack seat, and the clamping traction part includes a clamping Traction roller; when one end of the thin-walled sheet is docked on one of the traction parts on the support plate, two clamping traction rollers will clamp and limit the free end area of the thin-walled sheet, and then wrap the thin-walled sheet around On the support plate, the other end of the thin-walled plate is docked with another traction piece on the support plate; the traction piece includes a control electric cylinder, and the telescopic rod of the control electric cylinder is connected with a traction installation plate, and the traction installation plate The traction roller is arranged rotatably, and the traction motor for driving the traction roller to rotate is fixedly arranged.

Further, the base is provided with a screw motor, and the base is rotatably mounted with a moving screw, the screw motor is used to drive the moving screw, and the welding parts include a welding frame slidably installed on the base, the welding frame and the moving wire The rod constitutes a spiral pair; a welding electric cylinder is arranged on the top of the welding frame, and a welding carriage is connected to the telescopic rod of the welding electric cylinder; one end of the welding carriage is provided with a welding motor, and a welding wire is rotated on the welding carriage The welding motor is used to drive the welding screw rod; a welding torch is slidably arranged on the welding carriage, and the welding torch and the welding screw rod form a helical pair.

Further, a connecting rod is connected, one end of the connecting rod is connected with a connecting turntable, the connecting turntable is rotatably mounted on the rotating seat, and the output shaft supporting the rotating motor is fixedly connected with the connecting turntable.

Further, one end of the supporting outer cylinder is provided with an adjusting motor, and an adjusting screw rod is rotatably installed inside the supporting outer cylinder, and a guide rod is fixedly installed, and the extrusion column is slidably connected to the guide rod, and the extrusion column is connected The screw rod constitutes a spiral pair; the support plate is fixedly connected with a sliding column facing the surface of the supporting outer cylinder, and the sliding column is covered with a spring for providing elastic force; a squeezing wheel is arranged at the bottom of the sliding column, and the squeezing wheel is in contact with The inclined plate is in contact extrusion relationship.

Further, the inner rotation of the supporting outer cylinder is equipped with a ring gear; and the inner rotation of the supporting outer cylinder is provided with a rotating shaft arranged in a circular array, an eccentric wheel is connected to the rotating shaft, and one end of the rotating shaft facing the ring gear is connected to There are connecting gears; the connecting gear and the ring gear form a gear pair; the eccentric wheel rotates to drive the auxiliary support rod to slide; an auxiliary motor is arranged inside the supporting outer cylinder, and the auxiliary motor is used to drive one of the rotating shafts to rotate.

Further, the auxiliary support rod includes a push rod, an arc plate is connected to one end of the push rod, and the arc plate is in contact with the circumference of the eccentric wheel; a spring 2 for providing elastic force is sheathed on the push rod.

Further, the docking piece includes a docking slide bar and a docking screw rod fixedly connected to the docking plate, the docking slide bar is slidably connected to the side plate, a docking motor is arranged on the side plate, and a belt structure is connected to the output shaft of the docking motor , the belt pulley on one end of the belt structure and the butt screw mandrel form a helical pair to drive the butt screw mandrel to move.

Further, the cutting member includes a cutting oil cylinder arranged on the side plate, and a cutting knife is connected to the telescoping rod of the cutting oil cylinder.

Further, the surrounding seat is provided with a surrounding motor, the output shaft of the surrounding motor is connected with a surrounding gear, and the surrounding gear and the surrounding ring gear on the surrounding part form a gear pair to drive the surrounding ring gear to rotate; the surrounding part includes a The radial cylinder on the connecting frame is used to drive the radial sliding seat to slide; the radial sliding seat is provided with a driving motor, and the output shaft of the driving motor is connected with a meshing gear, and the meshing gear and the rack seat form a gear Rack pair; the clamping traction part includes a clamping cylinder arranged at one end of the rack seat, the output shaft of the clamping cylinder is connected with a clamping installation seat, and the clamping traction roller is rotated and arranged on the clamping installation seat, and the clamping installation A clamping traction roller motor for driving the clamping traction roller to rotate is arranged on the seat.

The beneficial effects of the present invention compared with the prior art are: (1) The present invention transfers one end of the thin-walled plate to the traction piece on the support plate through the butt joint and fixes it, and wraps the thin-walled plate around the support through the surrounding piece On the board, realize the docking of thin-walled plates, instead of manual docking work; (2) The present invention supports the thin-walled plates through the support assembly, making it transformed into a stable circle; the ejector pin is not supported on the thin-walled plates (3) In the present invention, after both ends of the thin-walled plate are fixed by the traction pieces on the support plate, the two traction pieces are rotated by the traction roller to adjust the extension length of the thin-walled plate, so that The two ends can be accurately connected to ensure the smooth progress of subsequent welding operations.

Description of drawings

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

Fig. 2 is a schematic diagram of the weldment of the present invention.

Fig. 3 is a schematic diagram of the butt joint of the present invention.

Fig. 4 is a schematic diagram of the traction member of the present invention.

Fig. 5 is a schematic diagram of the support assembly of the present invention.

Fig. 6 is a sectional view of the supporting outer cylinder of the present invention.

Fig. 7 is a partial schematic diagram of the inner structure of the supporting outer cylinder of the present invention.

Fig. 8 is a schematic diagram of the support plate of the present invention.

Fig. 9 is a schematic view of the surround of the present invention.

Fig. 10 is a schematic diagram of the partial structure of the surround of the present invention.

Reference signs: 1-base; 101-side plate; 102-rotary seat; 103-surrounding seat; 2-screw motor; 3-moving screw; 4-support rotating motor; 5-welding frame; 6-welding electric Cylinder; 7-welding motor; 8-welding carriage; 9-welding screw; 10-welding gun; 11-butting plate; 12-butting screw; 13-butting slider; 14-belt structure; 16-Control electric cylinder; 17-Traction motor; 18-Traction mounting plate; 19-Cutter; 1901-Cut off oil cylinder; 20-Docking motor; Adjusting motor; 23-support plate; 24-spring one; 25-extrusion wheel; 26-slider; 27-adjusting screw; 28-guide rod; 30-extrusion column; Motor; 33-rotating shaft; 34-eccentric wheel; 35-ejector; 36-spring two; 37-arc plate; 38-ring gear; 39-connecting gear; Circle; 43-connecting frame; 44-radial cylinder; 45-radial sliding seat; 46-rack seat; 47-engaging gear; 48-drive motor; 49-clamping cylinder; 50-clamping traction roller motor; 51-clamping traction roller; 52-clamping mounting seat.

Detailed ways

The present invention will be specifically described below in conjunction with the accompanying drawings: as shown in Figures 1 and 2, a cylindrical thin-walled high-pressure shell welding device includes a base 1, and the base 1 is connected with a side plate 101, a rotating seat 102 and a surrounding seat 103; The base 1 is slidably provided with a weldment; the base 1 is provided with a screw motor 2, and the base 1 is rotatably mounted with a moving screw 3, the screw motor 2 is used to drive the moving screw 3, and the weldment includes a sliding installation on the The welding frame 5 on the base 1, the welding frame 5 and the moving screw mandrel 3 form a spiral pair; a welding electric cylinder 6 is arranged on the top of the welding frame 5, and a welding slide frame 8 is connected to the telescoping rod of the welding electric cylinder 6; One end of frame 8 is provided with welding motor 7, and welding screw mandrel 9 is installed in rotation on welding carriage 8, and welding motor 7 is used for driving welding screw mandrel 9; Constitute the spiral pair with welding screw mandrel 9.

As shown in Figures 3 and 5, a butt joint is provided on the side plate 101, the butt joint includes a butt plate 11 slidably mounted on the side plate 101, a traction member is provided on the butt plate 11, and a butt joint is fixedly connected to the butt plate 11. The docking slide bar 13 and the docking screw rod 12, the docking slide bar 13 is slidingly connected with the side plate 101, the side plate 101 is provided with a docking motor 20, the output shaft of the docking motor 20 is connected with a belt structure 14, and one end of the belt structure 14 is The pulley and the butt screw mandrel 12 constitute a helical pair to drive the butt screw mandrel 12 to move.

As shown in Fig. 3 and Fig. 4, traction part comprises control electric cylinder 16, is connected with traction mounting plate 18 on the telescoping rod of control electric cylinder 16, is provided with traction roller 15 rotation on traction mounting plate 18, and is fixedly provided with for driving The traction motor 17 that the traction roller 15 rotates; the side plate 101 is provided with a traction piece and a cutting piece, and the cutting piece is used to cut off the thin-walled plate; the cutting piece includes a cutting cylinder 1901 arranged on the side plate 101, and the cutting piece The telescoping rod is connected with cutter 19.

As shown in Figures 5 to 8, a support assembly is rotatably installed on the rotating base 102, the support assembly includes a support outer cylinder 21, one end of the support outer cylinder 21 is connected with a connecting rod 2101, and one end of the connecting rod 2101 is connected with a connecting turntable 2102 , the connecting turntable 2102 is rotatably installed on the rotating base 102; the rotating base 102 is provided with a supporting rotating motor 4, and the output shaft of the supporting rotating motor 4 is fixedly connected with the connecting rotating disc 2102; The supporting plates 23 arranged in a shape array, wherein the two sides of one of the supporting plates 23 are respectively provided with traction parts; the inside of the supporting outer cylinder 21 is slidably installed with an extruding column 30, and the extruding column 30 is connected with a contact swash plate 31, One end of the supporting outer cylinder 21 is provided with an adjusting motor 22, and an adjusting screw 27 is installed in rotation inside the supporting outer cylinder 21, and a guide rod 28 is fixedly installed. 30 and the adjustment screw 27 constitute a helical pair; the support plate 23 is fixedly connected with a sliding post 26 on the surface supporting the outer cylinder 21, and the sliding post 26 is covered with a spring-24 for providing elastic force; the bottom end of the sliding post 26 is arranged There is a squeeze wheel 25, and the squeeze wheel 25 is in a contact squeeze relationship with the contact swash plate 31; an auxiliary support rod is slid between two adjacent support plates 23; a ring gear 38 is installed to support the inner rotation of the outer cylinder 21; And the rotation shaft 33 arranged in a circular array is arranged in the inner rotation of the support outer cylinder 21, the eccentric wheel 34 is connected on the rotation shaft 33, and the connecting gear 39 is connected with the end of the rotating shaft 33 facing the ring gear 38; the connecting gear 39 and the tooth The ring 38 forms a gear pair; the eccentric wheel 34 rotates to drive the auxiliary support rod to slide; an auxiliary motor 32 is arranged inside the support outer cylinder 21, and the auxiliary motor 32 is used to drive one of the rotating shafts 33 to rotate; the auxiliary support rod includes a push rod 35 One end of the push rod 35 is connected with an arc plate 37, and the arc plate 37 is in contact with the circumference of the eccentric wheel 34; the push rod 35 is covered with a spring 2 36 for providing elastic force.

As shown in Fig. 1, Fig. 9 and Fig. 10, a surrounding part is rotated on the surrounding seat 103, which is used to surround the thin-walled plate on the support plate 23; the surrounding part includes a surrounding ring gear rotatably mounted on the surrounding seat 103 42, a connecting frame 43 is connected to the inner side of the ring gear 42, a radial sliding seat 45 is slidably installed on the connecting frame 43, a rack seat 46 is slidably installed on the radial sliding seat 45, and two Clamping traction member, clamping traction member comprises clamping traction roller 51; Carry out clamping and limiting, and then surround the thin-walled sheet material on the support plate 23, and dock the other end of the thin-walled sheet material with another traction member on the support plate 23; the encircling seat 103 is provided with an encircling motor 40 , the output shaft of the surrounding motor 40 is connected with a surrounding gear 41, the surrounding gear 41 and the surrounding ring gear 42 on the surrounding part constitute a gear pair to drive the surrounding ring gear 42 to rotate; Cylinder 44, radial cylinder 44 is used to drive radial sliding seat 45 to slide; On radial sliding seat 45, be provided with driving motor 48, be connected with meshing gear 47 on the output shaft of driving motor 48, meshing gear 47 and rack seat 46 constitutes a rack and pinion pair; the clamping traction member includes a clamping cylinder 49 arranged at one end of the rack seat 46, the output shaft of the clamping cylinder 49 is connected with a clamping mounting seat 52, and the clamping traction roller 51 is rotated and arranged on the clamping On the holding mounting base 52, a clamping traction roller motor 50 for driving the clamping traction roller 51 to rotate is arranged on the clamping mounting base 52.

Working principle: the thin-walled plate is fed through the traction piece on the side plate 101, and cut by the cutter 19; one end of the thin-walled plate is clamped and fixed by the traction piece on the docking plate 11, and then the docking motor 20 works. Make the butt screw 12 and the butt plate 11 move to transport the clamped end of the thin-walled plate to the traction piece on the support plate 23; The traction piece near the side plate 101 is located at the top quadrant point on the circumference of the supporting outer cylinder 21; On the traction piece, clamp and fix by the traction piece on the support plate 23;

Driven by the drive motor 48, under gear transmission, the rack seat 46 slides toward the supporting outer cylinder 21, so that the two clamping traction rollers 51 move to both sides of the thin-walled plate, and the clamping cylinder 49 controls the clamping traction rollers 51 to The thin-walled sheet is clamped and limited; then it works around the motor 40, and under the gear transmission, it rotates around the ring gear 42, and then the clamping traction roller 51 carries the thin-walled sheet to move around the supporting outer cylinder 21; to move the thin-walled sheet The other end is docked with another traction member on the support plate 23, which can be rotated by two clamping traction rollers 51 to adjust the extension length of the end of the half-wall plate; Another traction member to be docked is located at the quadrant point on the top of the supporting outer cylinder 21; the radial cylinder 44 controls the radial distance of the clamping traction roller 51, so that the clamping traction roller 51 transfers the end of the thin-walled plate to the support plate 23 corresponding to The traction parts are clamped and fixed.

After both ends of the thin-walled sheet are fixed by the traction pieces on the support plate 23, the two traction pieces rotate through the traction roller 15 to adjust the protruding length of the thin-walled sheet so that the two ends are butted; at this time, the thin-walled sheet The butt joint is located at the top quadrant point on the circumference of the support outer cylinder 21; the adjustment motor 22 works to rotate the adjustment screw 27, the extrusion column 30 and the contact swash plate 31 slide, and then push the extrusion wheel 25 to slide, and the support plate 23 Sliding to support the thin-walled plate to transform it into a stable circle; when the auxiliary motor 32 works, the ring gear 38 rotates, and under the gear transmission, the rotating shaft 33 and the eccentric wheel 34 rotate to squeeze and push the arc plate 37 and The ejector rod 35 provides auxiliary support to the area of the thin-walled plate that is not supported by the support plate 23 .

When welding, the screw motor 2 works, so that the welding frame 5 slides, so that the welding torch 10 is located in the welding area; the welding electric cylinder 6 controls the height of the welding torch 10, and the welding screw 9 is pressed on both sides of the butt joint of the thin-walled plate; welding The motor 7 works, and the welding screw mandrel 9 rotates, so that the welding torch 10 slides and performs welding operation.

Claims (9)

1. A welding device for a cylindrical thin-wall high-pressure-resistant shell comprises a base (1), wherein a side plate (101), a rotating seat (102) and a surrounding seat (103) are connected to the base (1); a welding piece is arranged on the base (1) in a sliding manner; the method is characterized in that: the rotary seat (102) is rotatably provided with a supporting assembly, the supporting assembly comprises a supporting outer cylinder (21), supporting plates (23) which are arranged in a circular array are arranged on the circumference of the supporting outer cylinder (21) in a sliding manner, and traction pieces are respectively arranged on two sides of one supporting plate (23); an extrusion column (30) is slidably arranged in the supporting outer cylinder (21), a contact sloping plate (31) is connected to the extrusion column (30), and the contact sloping plate (31) is used for pushing the supporting plate (23) to slide radially; an auxiliary supporting rod is arranged between two adjacent supporting plates (23) in a sliding way; the thin-wall plate is round and surrounds the supporting plate (23), and two ends of the thin-wall plate are limited and fixed through traction pieces on the supporting plate (23); the auxiliary supporting rod is used for carrying out auxiliary supporting on the thin-wall plate; a butt joint piece is arranged on the side plate (101) and used for butt joint one end of the thin-wall plate to one of the traction pieces on the supporting plate (23); the butt joint piece comprises a butt joint plate (11) which is slidably arranged on the side plate (101), a traction piece is arranged on the butt joint plate (11), the side plate (101) is provided with a traction piece and a cutting piece, and the cutting piece is used for cutting off the thin-wall plate; a surrounding piece is rotatably arranged on the surrounding seat (103) and is used for surrounding the thin-wall plate on the supporting plate (23); the surrounding part comprises a surrounding gear ring (42) rotatably arranged on a surrounding seat (103), a connecting frame (43) is connected to the inner side of the surrounding gear ring (42), a radial sliding seat (45) is slidably arranged on the connecting frame (43), a rack seat (46) is slidably arranged on the radial sliding seat (45), two clamping traction parts are arranged on the rack seat (46), and each clamping traction part comprises a clamping traction roller (51); when one end of the thin-wall plate is butted on one traction piece on the supporting plate (23), the two clamping traction rollers (51) clamp and limit the free end area of the thin-wall plate, then the thin-wall plate is surrounded on the supporting plate (23) through surrounding, and the other end of the thin-wall plate is butted with the other traction piece on the supporting plate (23); the traction piece comprises a control electric cylinder (16), a traction mounting plate (18) is connected to a telescopic rod of the control electric cylinder (16), a traction roller (15) is rotatably arranged on the traction mounting plate (18), and a traction motor (17) for driving the traction roller (15) to rotate is fixedly arranged on the traction mounting plate.

2. The cylindrical thin-walled high pressure resistant housing welding apparatus as defined in claim 1, wherein: a screw motor (2) is arranged on the base (1), a movable screw (3) is rotatably arranged on the base (1), the screw motor (2) is used for driving the movable screw (3), the welding piece comprises a welding frame (5) which is slidably arranged on the base (1), and the welding frame (5) and the movable screw (3) form a screw pair; a welding electric cylinder (6) is arranged at the top of the welding frame (5), and a telescopic rod of the welding electric cylinder (6) is connected with a welding carriage (8); one end of the welding carriage (8) is provided with a welding motor (7), a welding screw rod (9) is rotatably arranged on the welding carriage (8), and the welding motor (7) is used for driving the welding screw rod (9); a welding gun (10) is arranged on the welding carriage (8) in a sliding manner, and the welding gun (10) and the welding screw rod (9) form a screw pair.

3. The cylindrical thin-walled high pressure resistant housing welding apparatus as defined in claim 1, wherein: the support assembly comprises a support rotating motor (4) arranged on a rotating seat (102), one end of a support outer cylinder (21) is connected with a connecting rod (2101), one end of the connecting rod (2101) is connected with a connecting rotary table (2102), the connecting rotary table (2102) is rotatably arranged on the rotating seat (102), and an output shaft of the support rotating motor (4) is fixedly connected with the connecting rotary table (2102).

4. A cylindrical thin-walled high pressure resistant housing welding apparatus as defined in claim 3, wherein: an adjusting motor (22) is arranged at one end of the supporting outer cylinder (21), an adjusting screw rod (27) is rotatably arranged in the supporting outer cylinder (21), a guide rod (28) is fixedly arranged, an extrusion column (30) is in sliding connection with the guide rod (28), and the extrusion column (30) and the adjusting screw rod (27) form a screw pair; a sliding column (26) is fixedly connected to the surface of the supporting plate (23) facing the supporting outer cylinder (21), and a first spring (24) for providing elasticity is sleeved on the sliding column (26); a squeezing wheel (25) is arranged at the bottom end of the sliding column (26), and the squeezing wheel (25) and the contact inclined plate (31) are in contact squeezing relation.

5. The welding device for the cylindrical thin-wall high-pressure-resistant shell, as set forth in claim 4, wherein: a gear ring (38) is rotatably arranged in the supporting outer cylinder (21); a rotary shaft (33) which is arranged in a circular array is rotatably arranged in the supporting outer cylinder (21), an eccentric wheel (34) is connected to the rotary shaft (33), and a connecting gear (39) is connected to one end of the rotary shaft (33) facing the gear ring (38); the connecting gear (39) and the gear ring (38) form a gear pair; the eccentric wheel (34) rotates to drive the auxiliary supporting rod to slide; an auxiliary motor (32) is arranged in the supporting outer cylinder (21), and the auxiliary motor (32) is used for driving one rotating shaft (33) to rotate.

6. The welding device for the cylindrical thin-wall high-pressure-resistant shell according to claim 5, wherein: the auxiliary supporting rod comprises a supporting rod (35), one end of the supporting rod (35) is connected with an arc plate (37), and the arc plate (37) is in contact with the circumference of the eccentric wheel (34); the ejector rod (35) is sleeved with a second spring (36) for providing elasticity.

7. The cylindrical thin-walled high pressure resistant housing welding apparatus as defined in claim 1, wherein: the butt joint piece comprises a butt joint sliding rod (13) and a butt joint screw rod (12) which are fixedly connected with a butt joint plate (11), the butt joint sliding rod (13) is in sliding connection with a side plate (101), a butt joint motor (20) is arranged on the side plate (101), a belt structure (14) is connected to an output shaft of the butt joint motor (20), and a belt pulley on one end of the belt structure (14) and the butt joint screw rod (12) form a screw pair so as to drive the butt joint screw rod (12) to move.

8. The cylindrical thin-walled high pressure resistant housing welding apparatus as defined in claim 1, wherein: the cutting piece comprises a cutting oil cylinder (1901) arranged on the side plate (101), and a cutter (19) is connected to a telescopic rod of the cutting oil cylinder (1901).

9. The cylindrical thin-walled high pressure resistant housing welding apparatus as defined in claim 1, wherein: the surrounding seat (103) is provided with a surrounding motor (40), an output shaft of the surrounding motor (40) is connected with a surrounding gear (41), and the surrounding gear (41) and a surrounding gear ring (42) on the surrounding piece form a gear pair so as to drive the surrounding gear ring (42) to rotate; the surrounding piece comprises a radial cylinder (44) arranged on the connecting frame (43), and the radial cylinder (44) is used for driving the radial sliding seat (45) to slide; a driving motor (48) is arranged on the radial sliding seat (45), an output shaft of the driving motor (48) is connected with a meshing gear (47), and the meshing gear (47) and the rack seat (46) form a gear-rack pair; the clamping traction piece comprises a clamping cylinder (49) arranged at one end of the rack seat (46), a clamping installation seat (52) is connected to an output shaft of the clamping cylinder (49), the clamping traction roller (51) is rotatably arranged on the clamping installation seat (52), and a clamping traction roller motor (50) for driving the clamping traction roller (51) to rotate is arranged on the clamping installation seat (52).