CN114131261A

CN114131261A - Double-sided circular seam welding system and method

Info

Publication number: CN114131261A
Application number: CN202111647871.9A
Authority: CN
Inventors: 陆世华; 徐建中; 樊文斌; 李俊; 高丽彬; 周力伟; 王铖; 邹成凯
Original assignee: Shanghai Zhenghua Heavy Industries Co Ltd
Current assignee: Shanghai Zhenghua Heavy Industries Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-03-04

Abstract

The invention discloses a double-sided girth welding system and a method thereof, wherein the double-sided girth welding system comprises the following steps: the driving device is used for placing and driving the rotating component to be welded; the welding guns are provided with 2 welding guns which are respectively arranged on two side surfaces of the rotating component to be welded and used for welding the component to be welded; the oscillator is provided with 2 oscillators for installing and oscillating the corresponding welding guns; 2 regulators for installing and adjusting the corresponding oscillators; and the rack is provided with 2 sets of the regulators, and the regulators are respectively arranged on two sides above the driving device and used for installing the corresponding regulators. The invention is suitable for regular revolving bodies or large irregular components, and improves the girth welding efficiency and quality.

Description

Double-sided circular seam welding system and method

Technical Field

The invention relates to a steel structure manufacturing technology, in particular to a double-sided girth welding system and a method thereof.

Background

The pin shaft connecting structure in a large steel structure product is used as a wide application form. The heavy duty otic placode shaft hole both sides that usually bear the heavy load need adopt to add the heavy pound circle of welding to reduce to the pin axle extrusion intensity. According to the extrusion strength, the heavy pound ring and the main plate welding line mainly have two modes of groove welding and fillet welding. The heavy pound board that the diameter is greater than 300mm welds seam with the mainboard ring, and manual welding is inefficient, and the welding seam outward appearance shaping is also relatively poor, and the work load that the welding seam was polished is big. Structural members produced by general enterprises every year are provided with a large number of heavy lifting lugs, hinged point lug plates, support lug plates and other heavy pound rings with similar shapes, which are arranged on the two sides of a main plate, and the thickness of the plate is thicker. At present, a workshop manufacturing process is that a main board is horizontally placed on a workbench or the ground, and a heavy pound ring on the front side is assembled and welded, and then a crane is used for turning over to assemble and weld the heavy pound ring on the back side. The drawing requires that the outer circles of the heavy pound rings with different plate thicknesses need to be processed with 45-degree bevels of 10mm to 15mm, and the corresponding welding angles are 12mm to 18mm, so that the welding filling amount is large. Manual welding is adopted for coping with the welding, the efficiency is low, and the welding seam forming is not facilitated. The components need to be turned over by means of lifting equipment in the operation process, the working procedures are multiple, and the safety risk is high.

Disclosure of Invention

In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a double-sided circular seam welding system and method thereof, which are suitable for regular revolving bodies or large irregular members, and improve the circular seam welding efficiency and quality.

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

in one aspect, a double-sided girth welding system includes:

the driving device is used for placing and driving the rotating component to be welded;

the welding guns are provided with 2 welding guns which are respectively arranged on two side surfaces of the rotating component to be welded and used for welding the component to be welded;

the oscillator is provided with 2 oscillators for installing and oscillating the corresponding welding guns;

2 regulators for installing and adjusting the corresponding oscillators;

and the rack is provided with 2 sets of the regulators, and the regulators are respectively arranged on two sides above the driving device and used for installing the corresponding regulators.

Preferably, the driving device comprises a support main body structure, a rotary driving mechanism, an internal expansion type centering fixture and a movable jacking mechanism;

the support main body structure comprises a base, a rotary support, a jacking support and a slide rail;

the rotary support and the jacking support are respectively arranged at two end parts of the upper surface of the base, and the sliding rails are provided with 2 sliding rails symmetrically arranged on the upper surface of the jacking support;

the rotary driving mechanism comprises a driving motor, a speed reducer, a driving gear, a rotary support and a housing;

the driving motor and the speed reducer are arranged inside the slewing bearing, the output side of the driving motor is connected with the input side of the speed reducer, the output side of the speed reducer is connected with the driving gear, the driving gear is meshed with the slewing bearing, the slewing bearing is arranged on the inner side surface of the slewing bearing, and the housing is arranged on the outer sides of the driving gear and the slewing bearing;

the internal expansion type centering fixture is arranged on the slewing bearing;

the movable jacking mechanism comprises a movable main structure, a driven rotary supporting seat, a mandril and a slide block;

the slide block is arranged on the bottom surface of the movable main structure and matched with the slide rail, the driven rotary supporting seat is arranged on the inner side surface of the movable main structure and opposite to the internal expansion type centering fixture, one end of the ejector rod is connected with the movable main structure, and the other end of the ejector rod is connected with the upper surface of the jacking supporting seat.

Preferably, the distance L between the rotating support and the jacking support is more than 600 mm;

the height H between the rotation center of the rotation support and the upper surface of the base is larger than the maximum rotation radius of the part to be welded.

Preferably, the slewing bearing is of an external tooth type;

the housing is a sheet metal plate.

Preferably, the internal expansion type centering fixture comprises a chassis, an internal expansion type clamping jaw, a supporting cylinder, an anti-drop plate and a built-in motor;

the chassis is arranged on the slewing bearing, and a plurality of threaded holes are formed in the circumferential side surface of the chassis;

one end of the supporting cylinder is arranged on the inner side surface of the chassis, and the other end of the supporting cylinder is connected with the anti-falling plate;

the number of the inner expansion type clamping jaws is 3, the inner expansion type clamping jaws are uniformly distributed on the inner side surface of the chassis and are driven by the built-in motor;

the length of the supporting cylinder is greater than the plate thickness of a part to be welded;

open on the medial surface of a supporting cylinder has 3 mounting grooves, interior expanding jack catch is located in the mounting groove.

Preferably, the driven rotary supporting seat comprises a rotary support and a driven supporting seat;

the driven support is arranged on the inner side surface of the movable main structure, and the slewing bearing is arranged on the driven support;

the upper surface of the jacking support is provided with a fixed support;

one end of the ejector rod is hinged with the movable main structure, and the other end of the ejector rod is hinged with the fixed support.

Preferably, the oscillator comprises a motor, an oscillator main body, a base and a sliding block;

the motor drives the oscillator main body, the oscillator main body is connected with the base through a rotating shaft, and the sliding block is arranged on the oscillator main body;

the welding gun is arranged on the sliding block.

Preferably, the adjuster comprises an adjusting base, a rack seat, a driving gear and a linear module;

the driving gear and the rack seat are arranged in the adjusting base, and the adjusting base is connected and fixed with the sliding block in the linear module;

the driving gear drives the rack seat;

the base is connected with the rack seat.

Preferably, the rack comprises a track, a rack main structure and a driving mechanism;

the rack main structure is arranged on the track, and the driving mechanism drives the rack main structure to move along the track;

the straight line module is arranged on the rack main structure.

In another aspect, a double-sided girth welding method adopts the double-sided girth welding system to execute the following steps:

s1, fixing the component to be welded on the driving device;

s2, adjusting the positions of the frame and the welding gun on the two sides;

s3, selecting matched welding parameters according to the size of the groove and the welding angle on the component to be welded;

s4, backing welding;

s5, swing welding a cover surface;

s6, the frame drives the welding gun to leave a welding spot;

and S7, removing the welded weldment.

The invention provides a double-sided girth welding system and a double-sided girth welding method, which change the traditional single-sided welding, and enable the girth to be welded to be in an upright state and realize double-sided simultaneous welding by vertically clamping a component by special equipment. The method has a particularly remarkable effect when being applied to a thicker heavy pound ring, and the welding efficiency is improved by more than 80% compared with the conventional manufacturing and welding efficiency. Provides a new idea for welding similar structural members, and can be used for reference and popularization.

Drawings

FIG. 1 is a schematic structural view of a double-sided girth welding system of the present invention;

FIG. 2 is a schematic view of the structure of the driving device in the double-sided circular seam welding system of the present invention;

FIG. 3 is a schematic structural view of a main body structure of a holder in the driving device of FIG. 2;

FIG. 4 is a schematic view of the construction of a slewing drive mechanism in the drive of FIG. 2;

FIG. 5 is a schematic view of the internal expansion centering fixture of the drive of FIG. 2;

FIG. 6 is a schematic view of the internal expansion centering fixture of the drive of FIG. 2;

FIG. 7 is a schematic view of the construction of the oscillator in the double-sided girth welding system of the present invention;

FIG. 8 is a schematic view of the construction of the regulator in the double-sided girth welding system of the present invention;

FIG. 9 is a schematic view of the structure of the frame of the double-sided girth welding system of the present invention.

Detailed Description

In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.

Referring to fig. 1, the present invention provides a double-sided girth welding system, including:

and the driving device 3 is used for placing and driving the rotating component to be welded (comprising the main plate 1 and the heavy pound rings 2 on two side surfaces of the main plate).

And the welding guns 8 are provided with 2 welding guns which are respectively arranged on two side surfaces of the rotating component to be welded and used for welding the component to be welded.

The oscillator 7 has 2 oscillators for mounting and oscillating the corresponding welding guns.

The number of the adjusters 6 is 2, and the corresponding oscillators are installed and adjusted.

The frame has 2 (including mirror symmetry's left frame 4 and right frame 5) and locates the both sides about the top of drive arrangement 3 respectively for install corresponding regulator 6.

As shown in fig. 2, the driving device 3 includes a main support structure 31, a rotary driving mechanism 32, an internal expanding centering fixture 33, and a movable tightening mechanism 34.

As shown in fig. 3, the support main structure 31 includes a base 311, a pivoting support 312, a tightening support 313, and a sliding rail 314.

The revolving support 312 and the abutting support 313 are respectively arranged at two end parts of the upper surface of the

base

311, and 2 sliding rails 314 are symmetrically arranged on the upper surface of the abutting support 313.

The base 311 is formed by welding sectional materials, and has stable structure and strong pressure-bearing capacity. The rotating support 312 and the abutting support 313 are welded with the base 311 into a whole. The 2-pair slide rails 314 are symmetrically arranged on the upper surface of the jacking support 313 in a left-right mode and are used for installing the movable jacking mechanism 34. To ensure enough space on the top for installing the welding equipment, the distance L between the pivoting support 312 and the tightening support 313 needs to be larger than 600 mm. The height H of the center of rotation of rotating support 312 from the upper surface of base 311 needs to be greater than the maximum radius of rotation of the members to be welded so that girth welding of all similar members in a product can be applied.

As shown in fig. 4, the slewing drive mechanism 32 includes a drive motor 321, a reduction gear 322, a drive gear 323, a slewing bearing 324, and a housing 325.

The driving motor 321 and the speed reducer 322 are installed inside the slewing bearing 312, and the slewing bearing 324 is in an external gear type and is vertically installed on the vertical surface of the slewing bearing 312. The output shaft of the reducer 322 is connected with a driving gear 323 to drive the slewing bearing 324 to rotate. The electrical control and the circuits are all arranged inside the rotary support 312, so that the equipment is protected, and the appearance of the device is clean and tidy. The housing 325 is formed of a sheet metal plate into a ring-shaped structure, and protects the pivoting support 324 and the drive gear 323.

Referring to fig. 5, the internal expanding centering fixture 33 is mainly used for positioning and assembling a to-be-welded member and has a supporting function, and includes a chassis 331, internal expanding jaws 332, a supporting cylinder 333, an anti-drop plate 334, and an internal motor 335.

The end face of the base plate 331 is drilled together with the slewing bearing 324 in the slewing drive mechanism 32, and threaded holes are formed in the circumferential direction, and after other components are mounted on the base plate 331, the threaded holes are connected to the slewing bearing 324 by bolts. The support cylinder 333 functions to support a member to be welded and protect the inner expansion type jaw 332. The length of the supporting cylinder 333 needs to be larger than the total thickness of the components to be welded, one end of the supporting cylinder 333 is welded and fixed with the base plate 331, the other end of the supporting cylinder is provided with an anti-falling plate 334 to prevent the components to be welded from sliding off after being placed, and 3 notches are uniformly distributed in the circumferential direction and used for the inward-expanding type clamping jaws 332 to pass through. The internal expansion type clamping jaws 332 are provided with 3 pieces in total and are installed in the base plate 331 and driven by the built-in motor 335, the internal expansion type clamping jaws 332 are positioned inside the supporting cylinders 333 after being contracted, and after the components to be welded are respectively placed in the supporting cylinders 333, the built-in motor 335 drives the internal expansion type clamping jaws 332 to expand to drive the main board 1 and the heavy pound ring 2 in the components to be welded to achieve the purpose of concentric positioning.

As shown in fig. 6, the movable tightening mechanism 34 forms a set of opposite forces with the pivoting support 312 to clamp the members to be welded. The gravity center of the to-be-welded member is not coincident with the rotation axis, the to-be-welded member needs to be clamped to increase friction force after being placed and positioned, and the to-be-welded member is prevented from slipping or impacting in the rotation process and comprises a movable main structure 341, a driven rotation supporting seat 342, a push rod 343 and a sliding block 344.

The movable main structure 341 is used as a mounting base of other parts, a sliding block 344 is mounted at the bottom, the sliding block 344 is matched with the sliding rail 314, and the integral structure is mounted on the jacking support 313. The driven rotary supporting seat 342 is composed of a rotary support and a driven supporting seat, is vertically installed on the vertical surface of the movable main structure 341, and keeps concentric with the rotary support 324 and the internal expanding type centering fixture 33. The inner side surface of the driven rotary supporting seat 342 and the inner expansion type clamping jaws 332 in the inner expansion type centering fixture 33 are correspondingly provided with notches, and when a component to be welded with a large inner hole is clamped, the interference between the component and the inner expansion type clamping jaws 332 is avoided. The top rod 343 is hydraulic, one end of which is hinged with the movable main structure 341, and the other end of which is hinged with the fixed support on the tightening support 313, and is used for pushing the movable main structure 341 to move along the horizontal direction to form tightening of the component to be welded. When the device is not in operation, the movable jacking mechanism 34 is in an open state, the end surface of the driven rotary supporting seat 342 is 200mm away from the end surface of the anti-falling plate 334 in the internal expansion type centering clamp 33 and used for sleeving the heavy pound ring 2 and the main plate 1 into the supporting cylinder 333 in the internal expansion type centering clamp 33, the push rod 343 is started to push the movable main structure 341 to enable the driven rotary supporting seat 342 to tightly press a member to be welded, and the limit 345 is arranged at two ends of the driven rotary supporting seat 342 in the horizontal direction to prevent the push rod 343 from being overloaded.

As shown in fig. 7, the oscillator 7 includes a motor 701, an oscillator main body 702, a base 703, and a slider 704.

The motor 701 drives the oscillator main body 702, the oscillator main body 702 is connected to the base 703 via a rotating shaft 705, and the slider 704 is provided on the oscillator main body 702.

The welding gun 8 is mounted on a slider 704, and the oscillator body 702 is powered by a motor 701, and the slider 704 reciprocates along the oscillator body 702. The oscillator body 702 is connected to the base 703 via a rotating shaft 705, and angle adjustment can be performed. The entire structure of the oscillator 7 is finally fixed to the rack housing in the regulator by means of the base 703.

As shown in fig. 8, the adjuster 6 includes an adjustment base 601, a rack mount 602, a drive gear 603, and a linear module 604.

The driving gear 603 and the rack seat 602 are arranged in the adjusting base 601, and the adjusting base 601 is connected and fixed with the sliding block in the linear module 604.

The drive gear 603 drives the rack mount 602 and the base 703 is mounted on the rack mount 602.

The regulator 6 mainly functions to realize the up-down and left-right regulation of the oscillator 7 and the welding gun 8, and meet the welding requirements of the heavy pound rings 2 with different diameters. The rack seat 602 is adjusted up and down by the driving gear 603 and is installed in the adjusting base 601. The adjusting base 601 is connected and fixed with the sliding block in the linear module 604, so that left and right adjustment is realized. The whole structure of the regulator 6 is finally connected and fixed with the frame through the linear module 601.

As shown in fig. 9, the frame includes a rail 9, a frame main structure 10, and a driving mechanism 11.

The main frame structure 10 is disposed on the rail 9, the main frame structure 10 is driven by the driving mechanism 11 to move along the rail 9, and the linear module 601 is mounted on the main frame structure 10.

The machine frame mainly comprises a load regulator 6, a swinging device 7 and the like, and realizes the function of front and back regulation, thereby meeting the welding requirement of heavy pound rings 2 with different plate thicknesses. The driving mechanism 11 is arranged at the middle position of the whole frame and is used for driving the frame main structure 10 to move back and forth on the track 9.

The invention also provides a double-sided girth welding method, which adopts the double-sided girth welding system to execute the following steps:

s1, fixing the component to be welded on a driving device;

s2, adjusting the positions of the racks on the two sides and the welding gun;

s4, backing welding;

s5, swing welding a cover surface;

s6, the frame drives the welding gun to leave the welding spot;

and S7, removing the welded weldment.

The requirement of realizing the simultaneous welding of the double-sided circular seam meets the requirement that the component to be welded is in a vertical state. Therefore, the inner hole of the circumferential seam of the component to be welded is connected and fixed with the driving device by using the clamp, so that the component to be welded is in a vertical state, and the circumferential seam rotates around the axis by driving the rotary driving mechanism 32. After the component to be welded is in a vertical state capable of rotating around the axis of the circumferential weld, the precondition for realizing double-gun multilayer simultaneous welding on two sides is that a welding gun 8, a swinging device 7, an adjuster 6, a left frame 4, a right frame 5 and the like are arranged on two sides of the top of the component to be welded, and finally all devices are adjusted to the welding parameters matched with the component to be welded, so that welding can be realized, as shown in fig. 1.

Generally speaking, multilayer multi-pass welding is frequently adopted in the 90-degree flat fillet welding for welding thick plates and large grooves, and experiments prove that manual intervention is more when multilayer multi-pass welding is adopted on two sides, welding seam forming is poor, and efficiency is not obviously improved. After verification for many times, the double-sided girth welding system adopts the oscillator, the welding gun is regularly oscillated during welding to obtain a wider welding wave, and the slag is easy to float to the surface of the welding wave under the movement of the welding rod, so that the slag inclusion phenomenon of the welding wave is avoided. When the swing welding is adopted, the temperature of the electric arc is high, the welding surface is wider, the forming of a double-sided circular seam is facilitated, and the welding quality can be improved. The welding method is not suitable for welding thin plates, and the deformation rate of welding of the components is greatly increased due to heat output.

Before the two-side double-gun multilayer simultaneous welding method, more welding methods are adopted, and ideal welding seams are not welded. In the test process of the multilayer welding method, firstly, the test is single-side welding, a welding angle with a groove of 18mm and a groove of 15mm is welded by adopting MAG to share four layers, the front two layers are bottomed, the welding of the rear two layers takes a welding seam as a center, a welding gun regularly moves in the circumferential seam rotating process, and the swinging speed of the welding gun is different from the rotating speed of the circumferential seam according to different sizes of the welding seam. But the speed of the central point of the welding seam is slightly higher than that of the two sides in each swing process, because the central point of the welding seam is heated back and forth twice and the temperature is higher, and because of the moving relationship of the two sides, the two sides have the opportunity of cooling, and the metal can be melted through by slightly staying. The circular seam welded by the method meets the requirements of drawings. And finally, installing two sets of welding equipment on two sides of the trial welding piece, and adjusting parameters matched with the piece to be welded to complete double-gun multilayer simultaneous welding on two sides. The welding parameters need to be correspondingly set under the influence of different parameters such as the specification of a weldment, the thickness of a plate and the like, and a database can be established to deal with the welding of products with different specifications.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims

1. A double-sided girth welding system, comprising:

2 regulators for installing and adjusting the corresponding oscillators;

2. The double-sided girth welding system of claim 1, wherein: the driving device comprises a support main body structure, a rotary driving mechanism, an internal expansion type centering clamp and a movable jacking mechanism;

3. The double-sided girth welding system of claim 2, wherein: the distance L between the rotary support and the jacking support is larger than 600 mm;

4. The double-sided girth welding system of claim 2, wherein: the slewing bearing is of an external tooth type;

the housing is a sheet metal plate.

5. The double-sided girth welding system of claim 2, wherein: the internal expansion type centering fixture comprises a chassis, internal expansion type clamping jaws, a supporting cylinder, an anti-drop plate and a built-in motor;

6. The double-sided girth welding system of claim 2, wherein: the driven rotary supporting seat comprises a rotary support and a driven supporting seat;

the upper surface of the jacking support is provided with a fixed support;

7. The double-sided girth welding system of claim 1, wherein: the oscillator comprises a motor, an oscillator main body, a base and a sliding block;

the welding gun is arranged on the sliding block.

8. The double-sided girth welding system of claim 7, wherein: the adjuster comprises an adjusting base, a rack seat, a driving gear and a linear module;

the driving gear drives the rack seat;

the base is connected with the rack seat.

9. The double-sided girth welding system of claim 8, wherein: the rack comprises a track, a rack main structure and a driving mechanism;

the straight line module is arranged on the rack main structure.

10. A double-sided girth welding method, characterized in that the following steps are performed using the double-sided girth welding system according to any one of claims 1 to 9:

s1, fixing the component to be welded on the driving device;

s2, adjusting the positions of the frame and the welding gun on the two sides;

s4, backing welding;

s5, swing welding a cover surface;

s6, the frame drives the welding gun to leave a welding spot;

and S7, removing the welded weldment.