CN116100178A

CN116100178A - Correction butt joint method for large pipe fitting before welding

Info

Publication number: CN116100178A
Application number: CN202211347387.9A
Authority: CN
Inventors: 徐俊; 王敏; 董杨; 陈湘; 张为兵
Original assignee: Anhui Vocational College of Defense Technology
Current assignee: Anhui Vocational College of Defense Technology
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-05-12

Abstract

The utility model relates to the field of coaxial butt joint in pipe fitting welding, and discloses a correction butt joint method before welding of large pipe fittings, which comprises the following steps: moving the pipe fitting to be welded between two groups of butt joint auxiliary devices; step two: the clamping correction mechanism stretches into the pipe fitting; step three: the clamping correction assembly is used for coaxially and self-centering inner clamping of the pipe fitting; step four: one group of clamping correcting members clamps the pipe wall, the other group of clamping correcting members is switched to a correcting state, the pits on the surface of the pipe are corrected, dead angle-free pit correction treatment on the surface of the pipe is realized by staggering, and then the two groups of clamping correcting members both maintain the clamping state; step five: the two groups of mounting seats are mutually close to each other, so that the two pipe fittings are mutually close to each other, and then the feeding mechanism pulls the clamping correction mechanism to move with the pipe fittings, so that the two pipe fittings are finally coaxially butted.

Description

Correction butt joint method for large pipe fitting before welding

Technical Field

The utility model relates to the technical field of pipe fitting welding, in particular to the field of coaxial butt joint in pipe fitting welding, and particularly relates to a correction butt joint method before large pipe fitting welding.

Background

The large-sized circular pipe fitting is widely applied, and is widely applied to water supply, water drainage, heat supply, gas supply, long-distance petroleum and natural gas transportation, agricultural irrigation, hydraulic engineering and various industrial devices as a pipeline, an outer shell and the like, when the large-sized pipe fitting is welded, the large-sized pipe fitting is generally placed on a ground/welding table or lifted by a small lifting device, so that the end parts of the two pipe fittings are subjected to welding treatment at a spliced part after being coaxially butted and overlapped: 1. if the pipe fitting is a metal thin-wall pipe, the pipe fitting can deform no matter the pipe fitting is placed on the ground/a welding table or a large pipe fitting is lifted, and the coaxial butt joint between the two pipe fittings is seriously influenced; 2. the surface of the pipe fitting can be sunken in the transportation or storage process, and the welding can be influenced if the sunken part occurs at the metal end part; 3. the pipe fitting is placed on the ground/a welding table or lifted, when two groups of pipe fittings are in butt joint, the difficulty is high, inconvenience is caused, welding seams a on the two groups of pipe fittings cannot be overlapped, otherwise welding between the two groups of pipe fittings is affected, if the phenomenon of overlapping the welding seams a occurs, the pipe fittings need to be moved, the movement of the two groups of pipe fittings is inconvenient, the difficulty of clamping the pipe fittings before welding is increased, and the welding seams a refer to welding positions in the pipe fitting machining and forming process.

The applicant has found a Chinese patent of patent publication No. CN206952470U, which discloses a pipe fitting welding and righting device for construction, and the device is recorded as follows: when large pipe fittings are welded, the width of the welding line and the coaxiality of the pipe fittings are strictly required, while the traditional welding process is to weld on the ground, and the dead weight of the pipe fittings is utilized to keep motionless, but the width of the welding line cannot be strictly controlled in the welding process, so that the obtained welding piece has the problems of poor welding process, easy leakage, breakage and the like.

The applicant has found, through searching, a chinese patent of utility model, publication No. CN109128677a, which discloses a circumferential welding device for large round tubes, which describes: when large-scale circular pipe fittings are assembled by welding, the large-scale circular pipe fittings are inconvenient to move, inconvenient to position, low in concentricity and irregular in welding seams.

The applicant has found, through searching, a chinese patent of utility model, publication No. CN114055068A, which discloses an adjusting structure and a large pipe welding device, which describes: when large-scale metal pipe fitting is welded, need use small-size hoisting accessory to hoist large-scale pipe fitting for weld after two pipe fitting tip butt joint coincidence, because hoist large-scale metal pipe fitting and can not fix a position metal pipeline steadily, when welding the interface of pipe fitting, the pipe fitting takes place to touch the situation that removes and lead to the pipe fitting to appear misplacement, leads to pipe fitting welding quality to descend, the pipe fitting welding degree of difficulty increases.

The applicant finds out the Chinese patent of publication number CN113118245A through search, which discloses a quick orthopedic restoration for the surface depression of a metal thin-wall pipe fitting, and the quick orthopedic restoration is recorded as follows: the metal thin-wall tube has poor rigidity and weak strength, is easy to deform during processing and transportation, such as collision of the thin-wall tube during transportation, and can be concavely deformed after collision, thereby influencing the use value and the realized functions of the thin-wall tube.

Therefore, as known from the above patent documents, the problems of deformation, dishing, inconvenient movement and the like of the pipe fitting existing in the coaxial butt joint process before welding of two groups of large pipe fittings are actually present, and based on this, the present utility model proposes a correction butt joint method before welding of large pipe fittings.

Disclosure of Invention

In order to solve the problems mentioned in the background, the utility model provides a correction butt joint method before welding large-scale pipe fittings.

In order to achieve the technical purpose, the technical scheme adopted by the utility model is as follows.

The utility model provides a correction butt joint method before large-scale pipe fitting welds, it includes the base, install two sets of mount pads on the base, the mount pad can take place to remove, all be provided with the auxiliary device that docks on every set of mount pad, auxiliary device that docks includes the installation mechanism, install feed mechanism on the installation mechanism, the feed mechanism in two sets of auxiliary device that dock one end in opposite directions is provided with the centre gripping correction mechanism, the installation mechanism is used for traction feed mechanism and centre gripping correction mechanism take place to remove along vertical direction, feed mechanism is used for traction centre gripping correction mechanism and pipe fitting take place to remove along the pipe fitting axial, centre gripping correction mechanism includes two sets of centre gripping correction member, centre gripping correction member is provided with two kinds of states: the clamping correction component comprises a driving component and a clamping correction component, wherein the clamping correction component is used for clamping the pipe fitting or correcting the surface depression of the pipe fitting, and the driving component is used for providing driving force for clamping or correcting the clamping correction component;

which comprises the following steps:

step one: the pipe fitting to be welded is moved between two groups of butt joint auxiliary devices through hoisting equipment;

step two: the feeding mechanism pulls the clamping correcting mechanism to move, so that the clamping correcting mechanism stretches into the pipe fitting;

step three: the driving assembly operates to drive the clamping correction assembly to coaxially and self-centering inner clamp the pipe fitting, and after clamping is finished, the hoisting equipment loosens the pipe fitting and leaves;

step four: one group of clamping correcting members keeps clamping the pipe wall, the other group of clamping correcting members releases the clamping of the pipe wall and switches to a correcting state, the concave of the surface of the pipe fitting is corrected, then the clamping correcting members in the correcting state switch to a clamping state, the clamping correcting members in the clamping state switch to a correcting state, thus dead angle-free concave correction treatment is carried out on the surface of the pipe fitting, and then the two groups of clamping correcting members keep the clamping state;

step five: the two groups of mounting seats are mutually close to each other, so that the two pipe fittings are mutually close to each other, and then the feeding mechanism pulls the clamping correction mechanism to move with the pipe fittings, so that the two pipe fittings are finally coaxially butted.

Further, the feeding mechanism comprises a threaded column arranged on the mounting frame, the interior of the threaded column is hollow and axially parallel to the moving direction of the mounting seat, the threaded column can only move axially or only rotate around the axial direction, the threaded column is axially divided into a threaded section and a smooth section, the threaded section is connected with the feeding mechanism, and the smooth section is used for mounting the clamping correction mechanism.

Furthermore, in the fifth step, after the two pipe fittings are coaxially butted, the clamping correction mechanism and the pipe fitting clamped by the clamping correction mechanism can be rotated together through the rotation of the threaded column, so that the welding seams a on the two pipe fittings are staggered, and the welding seams a refer to welding positions in the pipe fitting machining and forming process.

Further, the clamping correction assembly comprises a fixing frame and a clamping correction unit, the fixing frame comprises a ferrule coaxially sleeved outside the smooth section of the threaded column in a rotating mode, a transverse frame is arranged at one end, deviating from the threaded section of the threaded column, of the ferrule in an extending mode, the clamping correction unit comprises a connecting frame, connecting rods are hinged between the connecting frame and the transverse frame, two groups of connecting rods are arranged along the axial direction of the ferrule, a ring frame is slidably mounted outside the ferrule, and a push-pull rod is hinged between the ring frame and the connecting rods.

Further, the correction frame is rotatably installed on the connecting frame, the axial direction of the rotating shaft formed by the rotation installation position is parallel to the axial direction of the ferrule, the input end of the rotating shaft is connected with five power of the motor arranged on the connecting frame, the outer wall of the correction frame is arranged to be a correction cambered surface in a cambered surface shape, the clamping wheels are rotatably installed on the correction frame, the axial direction of the clamping wheels, which is perpendicular to the axial direction of the rotating shaft, of the clamping wheels is provided with a plurality of groups along the axial array of the threaded column, the plurality of groups of clamping wheels are connected with six power of the motor arranged on the connecting frame through power transmission parts, and the clamping correction units in each group of clamping correction members are provided with a plurality of groups of clamping correction units in the circumferential direction array of the ferrule and are arranged in a staggered mode.

Further, in the clamping process in the third step, the following steps are performed:

s31: the driving assembly drives the clamping wheel to be close to the inner wall of the pipe fitting and realizes the inner clamping of the pipe fitting;

s32: the six motors drive the clamping wheels to rotate, the clamping wheels rotate to draw the pipe fitting to move along the axial direction, and then the parts of the clamping correction units, which are positioned on the two sides of the center of the pipe fitting, are symmetrically arranged.

Further, the driving assembly comprises a motor frame arranged inside the threaded column, a motor seven and a motor eight are arranged on the motor frame, the driving assembly further comprises an outer sleeve shell coaxially sleeved outside the smooth section of the threaded column in a rotating mode, the outer sleeve shell is fixedly connected with a ferrule, a first screw rod is arranged between the outer sleeve shell and the ring frame, the input end of the first screw rod stretches into the outer sleeve shell, the first screw rod is in threaded connection with the ring frame, the axial direction of the first screw rod is parallel to the axial direction of the threaded column, a plurality of groups of first screw rods are arranged along the circumferential direction array of the threaded column, power connection is achieved between the input end of the first screw rod and the motor seven through a third power connection piece, and power connection is achieved between the outer sleeve shell and the motor eight through a fourth power connection piece.

Further, the docking assisting device further comprises a balancing component, the balancing component is correspondingly matched with the clamping correcting mechanism and is respectively located on two sides of the mounting mechanism, and the balancing component is used for forming gravity balance with the clamping correcting mechanism.

Compared with the prior art, the utility model has the beneficial effects that:

the core of this scheme lies in, carries out the coaxial internal clamp of self-centering to the pipe fitting through centre gripping guiding mechanism, and the centre gripping guiding mechanism in two sets of butt joint auxiliary device is coaxial arrangement, so is coaxial arrangement between two sets of pipe fittings of being held, and centre gripping guiding mechanism is provided with two kinds of states: a clamping state and a correction state, the former clamping the pipe fitting, the latter being used for correcting the recess of the pipe fitting surface;

in addition, in the scheme, after the pipe fitting is clamped, the pipe fitting can move along the axial direction and rotate around the axial direction, namely, after the pipe fitting is clamped, the pipe fitting is convenient to move, a worker can clean a manual operation control screen according to practice, fine-tune the position of the pipe fitting, and the coaxial butting accuracy between the two pipe fittings is improved;

in addition, in the scheme, the two pipe fittings are firmly and stably clamped, the clamped pipe fittings are suspended, no shielding exists outside, the subsequent welding process is convenient, in the welding process, the two pipe fittings can rotate without affecting coaxial butt joint, the rotation is realized by driving rotation of the threaded column, the welding process is facilitated, workers do not need to stand below the pipe fittings, and the safety is also ensured;

besides, the clamping correction mechanism is used for clamping the pipe fitting through the cooperation of the clamping wheels, the clamping wheels can be driven to rotate, and the pipe fitting is further moved in the axial direction, and the pipe fitting clamping correction mechanism has the significance that when the pipe fitting is clamped, the clamping wheels which are partially close to the stand are not used, but the clamping of the pipe fitting is not affected, the pipe fitting with long pipe length is not fully distributed in the pipe fitting even if the clamping correction mechanism integrally extends into the pipe fitting, and the position of the hoisting equipment when hoisting the pipe fitting to the two groups of butt joint auxiliary devices each time is deviated, and in this case, the position of the hoisting equipment extending into the pipe fitting each time is deviated, so that the pipe fitting is required to be rotationally pulled by the clamping wheels, and the parts of the clamping correction units positioned at two sides of the center of the pipe fitting are symmetrically arranged, so that the clamping stability is improved;

in addition, in the scheme, the butt joint auxiliary device can be driven to move through the matching of the rack and the gear, the threaded column can also move, and under the condition of smaller occupied area, a larger space is reserved for the pipe fitting, and the space refers to the area between the two groups of butt joint auxiliary devices;

in addition, in the scheme, a balance component is also arranged for realizing the gravity balance of the two sides of the stand.

Drawings

FIG. 1 is a schematic view of the present utility model when two sets of pipes are butted;

FIG. 2 is a schematic view of a base and a mounting base;

FIG. 3 is a schematic view of the docking aid as clamping a tubular;

FIG. 4 is a schematic view of a docking assistance device;

FIG. 5 is a schematic view of a balance member and mounting mechanism and threaded post;

FIG. 6 is a schematic view of a feed member;

FIG. 7 is a schematic view of a clamping correction mechanism and a threaded post;

FIG. 8 is a schematic diagram of two sets of clamping correction components in the same set of clamping correction mechanisms;

FIG. 9 is an exploded view of two sets of clamping correction assemblies in the same set of clamping correction mechanisms;

FIG. 10 is a side view of two sets of clamping correction assemblies in the same set of clamping correction mechanisms;

FIG. 11 is a schematic view of a mount, ring mount, connecting rod, and push-pull rod;

fig. 12 is an exploded view of the grip correction unit;

FIG. 13 is an exploded view of the alignment jig and clamping wheel;

FIG. 14 is a schematic diagram of a first drive assembly;

FIG. 15 is a second schematic diagram of the drive assembly;

FIG. 16 is a partial schematic view of a first drive assembly;

fig. 17 is a partial schematic view of a second drive assembly.

The reference numerals in the drawings are:

100. a base; 101. a mounting base; 102. a first motor;

200. a docking assistance device;

300. a mounting mechanism; 301. a vertical frame; 302. a linear module; 303. a second motor; 304. a mounting frame;

400. a feeding mechanism; 401. a threaded column; 402. a third motor; 403. a fourth motor; 404. a first power connecting piece; 405. a second power connecting piece;

500. a clamping correction mechanism; 501. a drive assembly; 502. clamping the correction assembly; 503. a fixing frame; 504. a clamping correction unit; 505. a ferrule; 506. a cross frame; 507. a connecting rod; 508. a ring frame; 509. a push-pull rod; 510. a connecting frame; 511. a fifth motor; 512. a sixth motor; 513. a correction frame; 514. a clamping wheel; 515. a rotating shaft; 516. a power transmission member; 517. an outer shell; 518. a first screw rod; 519. a bracket; 520. a third power connecting piece; 521. a power connecting piece IV; 522. a seventh motor; 523. a motor eight;

600. a balance member; 601. a balancing stand; 602. a carriage; 603. balancing weight; 604. a connecting rope; 605. a spring.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1-17, a correction butt joint device for welding large pipe fittings comprises a base 100, wherein two groups of mounting seats 101 are mounted on the base 100, the mounting seats 101 can move respectively, in particular, sliding rails and racks which are parallel to each other are mounted on the base 100, the mounting seats 101 and the sliding rails form sliding fit, a first motor 102 is arranged on the mounting seats 101, a gear meshed with the racks is arranged at the output end of the first motor 102, and the first motor 102 drives the mounting seats 101 to move along the guiding direction of the sliding rails through the matching of the gear and the racks.

Each set of mounting seats 101 is provided with a butt joint auxiliary device 200, and the butt joint auxiliary device 200 is used for clamping a pipe fitting to be welded in an internal clamping mode and dragging the pipe fitting to move along the axial direction, and in addition, the butt joint auxiliary device 200 can also be used for correcting surface pits of the pipe fitting in the clamping process.

The technical scheme aims at a large-sized round pipe fitting, the large-sized round pipe fitting is generally formed by rolling a metal plate into a round pipe, and then welding the contact positions of two ends of the plate by utilizing a welding technology to form a round pipe fitting, wherein the welding position is named as a welding seam a.

As shown in fig. 4, the auxiliary docking device 200 includes a mounting mechanism 300, a feeding mechanism 400 is mounted on the mounting mechanism 300, and a clamping correction mechanism 500 is disposed at one end of the two groups of auxiliary docking devices 200, which is opposite to the feeding mechanism 400, wherein the mounting mechanism 300 is used for pulling the feeding mechanism 400 and the clamping correction mechanism 500 to move along a vertical direction, the feeding mechanism 400 is used for pulling the clamping correction mechanism 500 and the pipe to move along the axial direction of the pipe, and the clamping correction mechanism 500 is used for switching between clamping the pipe and correcting the surface recess of the pipe.

As shown in fig. 5, the installation mechanism 300 includes a stand 301 disposed on the installation seat 101, a mounting frame 304 is slidably mounted on the stand 301 along a vertical direction, and a linear module 302 for driving the mounting frame 304 to move along the vertical direction is further disposed, specifically, the linear module 302 includes a second screw rod vertically mounted on the mounting frame 304 and a second motor 303 in power connection with the second screw rod, the second screw rod is in threaded connection with the mounting frame 304, and the second motor 303 drives the second screw rod to rotate, so as to drive the mounting frame 304 to move along the vertical direction.

As shown in fig. 5 and 6, the feeding mechanism 400 includes a screw column 401 mounted on the mounting frame 304, and the inside of the screw column 401 is hollow and axially parallel to the moving direction of the mounting seat 101, i.e., parallel to the extending direction of the rack.

The motor III 402 and the motor IV 403 are arranged on the mounting frame 304, the first power connecting piece 404 is arranged between the motor IV 403 and the threaded column 401, the driving piece of the first power connecting piece 404 is arranged at the output end of the motor IV 403, the driven piece is arranged outside the threaded column 401 in a threaded manner and is limited by the mounting frame 304 to rotate only, the second power connecting piece 405 is arranged between the motor III 402 and the threaded column 401, the driving piece of the second power connecting piece 405 is arranged at the output end of the motor III 402, the driven piece is arranged outside the threaded column 401 through the guiding piece and is limited by the mounting frame 304 to rotate only, the guiding piece comprises a guiding groove axially arranged on the outer wall of the threaded column 401 along the threaded column 401 and a guiding protrusion arranged on the driven piece, and the guiding protrusion and the guiding groove form a sliding fit.

When the motor IV 403 runs and the motor III 402 does not run, the threaded column 401 only moves along the axial direction; the third motor 402 and the fourth motor 403 operate together, the former operation drives the threaded column 401 to rotate and move, the latter operation drives the threaded column 401 to move, and the threaded column 401 of the former and the threaded column 401 of the latter move at the same speed and reverse directions to cancel each other, so that the threaded column 401 only rotates around the axial direction, and the threaded column 401 moves and rotates together with the butt joint auxiliary device 200 and the pipe fitting clamped by the butt joint auxiliary device.

As shown in fig. 5, the threaded post 401 is axially divided into a threaded section and a smooth section, the threaded section is connected to the feed mechanism 400, and the smooth section is used for mounting the clamping correction mechanism 500.

As shown in fig. 7-10, the clamping correction mechanism 500 includes two sets of clamping correction members provided with two states: and (3) clamping the pipe fitting, and correcting the surface concave correction state of the pipe fitting.

The clamping correcting member comprises a driving component 501 and a clamping correcting component 502, wherein the clamping correcting component 502 is used for clamping a pipe or correcting the surface depression of the pipe, and the driving component 501 is used for providing driving force for clamping or correcting the clamping correcting component 502.

As shown in fig. 8, the clamping calibration assembly 502 includes a fixing frame 503 and a clamping calibration unit 504.

As shown in fig. 11 and 12, the fixing frame 503 includes a ferrule 505 coaxially and rotatably sleeved outside the smooth section of the threaded column 401, a transverse frame 506 extends from one end of the ferrule 505, which is away from the threaded section of the threaded column 401, the clamping correction unit 504 includes a connecting frame 510, a connecting rod 507 is hinged between the connecting frame 510 and the transverse frame 506, and two groups of connecting rods 507 are arranged along the axial direction of the ferrule 505.

A ring frame 508 is slidably arranged outside the ring 505, and a push-pull rod 509 is hinged between the ring frame 508 and the connecting rod 507; when the ring frame 508 moves towards the direction of the thread section of the thread column 401, the connecting rod 507 is pulled to deflect through the push-pull rod 509, so that the connecting frame 510 moves away from the transverse frame 506, otherwise, when the ring frame 508 moves towards the direction away from the thread section of the thread column 401, the connecting rod 507 is pushed to deflect through the push-pull rod 509, and the connecting frame 510 moves close to the transverse frame 506.

As shown in fig. 12 and 13, a correction frame 513 is rotatably mounted on the connection frame 510, and an axial direction of a rotating shaft 515 formed at the rotation mounting position is parallel to an axial direction of the ferrule 505, an input end of the rotating shaft 515 is in power connection with a motor five 511 arranged on the connection frame 510, and an outer wall of the correction frame 513 is arranged in a cambered surface shape and is named as a correction cambered surface.

The correction frame 513 is rotatably provided with clamping wheels 514, the axial direction of the clamping wheels 514 is perpendicular to the axial direction of the rotating shaft 515, a plurality of groups of clamping wheels 514 are arranged along the axial direction array of the threaded column 401, and the plurality of groups of clamping wheels 514 are in power connection with a motor six 512 arranged on the connecting frame 510 through a power transmission piece 516.

As shown in fig. 9 and 10, the clamping correction units 504 in each set of clamping correction members are arranged in an array along the circumferential direction of the ferrule 505, and the clamping correction units 504 in the two sets of clamping correction members are arranged in a staggered manner, as shown in fig. 10.

The fifth motor 511 drives the rotation shaft 515 and the correction frame 513 to rotate, so as to determine whether the correction arc surface is opposite to the inner wall of the pipe fitting or the clamping wheel 514 is opposite to the inner wall of the pipe fitting, specifically:

the large pipe fitting is lifted to a position between two groups of clamping correction devices through the small lifting device, then, the threaded column 401 only moves along the axial direction, so that the clamping correction mechanism 500 stretches into the pipe fitting, then, clamping wheels 514 in the two groups of clamping correction members are opposite to the inner wall of the pipe fitting, then, a driving assembly 501 drives a ring frame 508 to move towards the threaded section direction of the threaded column 401, a connecting rod 507 is pulled to deflect through a push-pull rod 509, a connecting frame 510 is further made to move away from the transverse frame 506, even if the whole clamping correction unit 504 moves towards the inner wall of the pipe fitting, the clamping wheels 514 cooperate to clamp the pipe fitting in a self-centering inner clamping mode, after clamping is finished, the small lifting device loosens the pipe fitting and leaves, and at the moment, a motor six 512 drives the clamping wheels 514 to rotate in the same direction through a power transmission piece 516, so that the pipe fitting can be driven to move along the axial direction, and coaxial butt joint between the two pipe fittings is realized.

If there is a dent on the surface of the pipe, one of the two sets of clamping correcting members keeps clamping the pipe wall, and the other clamping correcting member releases the clamping of the pipe wall and makes the correcting cambered surface face against the inner wall of the pipe, then, the driving component 501 in the clamping correcting member which releases the clamping drives the clamping correcting unit 504 to move towards the inner wall of the pipe again, so that the correcting face is contacted with the inner wall of the pipe.

As shown in fig. 14-17, the drive assembly 501 includes a motor mount disposed within the threaded post 401, with a motor seven 522 and a motor eight 523 mounted thereon.

The driving assembly 501 further comprises a casing 517 coaxially and rotatably sleeved outside the smooth section of the threaded column 401, the casing 517 is fixedly connected with the ferrule 505, a first screw rod 518 is arranged between the casing 517 and the ring frame 508, the input end of the first screw rod 518 extends into the casing 517, the first screw rod 518 is in threaded connection with the ring frame 508, the axial direction of the first screw rod 518 is parallel to the axial direction of the threaded column 401, a plurality of groups of first screw rods 518 are arranged along the circumferential direction of the threaded column 401 in an array manner, and the ring frame 508 is driven to move by rotation of the first screw rods 518.

The input end of the first screw rod 518 is in power connection with the seventh motor 522 through a third power connector 520, the outer sleeve 517 is in power connection with the eighth motor 523 through a fourth power connector 521, and a bracket 519 for installing the third power connector 520 and the fourth power connector 521 is further arranged in the outer sleeve 517; in this embodiment, the first, second, third, fourth power connectors and the power transmission member 516 are all implemented by conventional technical means in the existing power transmission path, and are not described in detail.

The seventh motor 522 is operated to drive the first screw 518 to rotate, so that the ring frame 508 is moved, the clamping correction unit 504 is moved, and the self-centering pipe fitting clamping or pipe fitting loosening is realized; in addition, the motor eight 523 operates to drive the outer casing 517 to rotate, the outer casing 517 rotates with the ferrule 505 and thus with the clamping and correcting assembly 502, and the clamping and correcting assembly 502 in the correct position corrects the surface depressions of the pipe.

In the preferred embodiment, as shown in fig. 3 and 4, since the entire docking assistance device 200 is disposed on the smooth section of the threaded post 401, this may cause unbalance, and the threaded post 401 is heavy and light, which is disadvantageous for use, based on which the docking assistance device 200 further comprises a balance member 600.

Specifically, as shown in fig. 4 and 5, the balancing member 600 includes a balancing stand 601 slidably connected to the stand 301 along a vertical direction, the balancing stand 601 and the clamping and correcting mechanism 500 are respectively located at two sides of the stand 301, and a supporting frame is disposed at an end of a threaded section of the threaded column 401, and the supporting frame and the balancing stand 601 form a sliding fit along an axial direction of the threaded column 401.

The balance frame 601 is provided with a sliding frame 602 in a sliding manner along the axial direction of the threaded column 401, the suspension end of the sliding frame 602 is downwards provided with a supporting sleeve, the supporting sleeve is coaxially sleeved outside the external sleeve 517 or outside the smooth section of the threaded column 401 through a bearing, the smooth section of the threaded column 401 is supported, and the supporting sleeve and the sliding frame 602 move together when the threaded column 401 moves.

The balancing stand 601 is further provided with the balancing weight 603 along the axial direction of the threaded column 401 in a sliding manner, the balancing stand 601 is further provided with the spring 605, the free end of the spring 605 is connected with the balancing weight 603, the spring 605 is used for pulling the balancing weight 603 to move close to the vertical frame 301, the balancing stand 601 is further provided with the pulley, a connecting rope 604 is arranged between the balancing stand 601 and the sliding frame 602, one end of the connecting rope 604 is connected with the sliding frame 602, the other end of the connecting rope bypasses the pulley and then is connected with the balancing weight 603, when the threaded columns 401 in the two groups of docking assisting devices 200 move close to each other, the sliding frame 602 moves along with the threaded columns 401 and pulls the balancing weight 603 to move away from the vertical frame 301 through the connecting rope 604, that is to say, in the process of docking assisting devices 200 are away from the vertical frame 301, when the balancing weight 603 is also away from the vertical frame 301, and after welding is finished, the docking assisting devices 200 are reset to be close to the vertical frame 301, the balancing weight 603 is also close to the vertical frame 301, and the balancing is realized due to the fact that the balancing weight 603 and the docking assisting devices 200 are respectively located at two sides of the vertical frame 301.

The working principle of the utility model is as follows:

first,: moving the pipe fitting to be welded between the two groups of butt joint auxiliary devices 200 through hoisting equipment;

then: the threaded column 401 only moves along the axial direction, so that the clamping correction mechanism 500 extends into the pipe fitting;

then: the clamping wheels 514 in the two groups of clamping correcting members are opposite to the inner wall of the pipe fitting, the driving assembly 501 drives the ring frame 508 to move towards the thread section direction of the thread column 401, the connecting rod 507 is pulled to deflect through the push-pull rod 509, the connecting frame 510 is further moved away from the transverse frame 506, even if the whole clamping correcting unit 504 moves towards the inner wall of the pipe fitting, the plurality of clamping wheels 514 clamp the pipe fitting in a self-centering inner clamping mode, and after clamping is finished, the small lifting device loosens the pipe fitting and leaves;

if there is a dent on the surface of the pipe, one group of clamping correcting members keeps clamping the pipe wall, the other group of clamping correcting members releases the clamping of the pipe wall and makes the correcting cambered surface face against the inner wall of the pipe, then the driving component 501 in the clamping correcting members releases the clamping and correcting unit 504 move towards the inner wall of the pipe again to make the correcting surface contact with the inner wall of the pipe, the dent on the surface of the pipe is pushed and repaired through the correcting cambered surface, then the driving component 501 drives the fixing frame 503 to rotate, namely drives the clamping and correcting component 502 to integrally rotate, the rotation displacement is equal to the distance between the clamping correcting units 504 in the two groups of clamping correcting members, then the clamping correcting members are switched to correct, the two clamping correcting members can rotate the correcting surface for one round, and after the correction is finished, the two groups of clamping correcting members are switched to clamp the pipe;

then: the motor six 512 drives the clamping wheel 514 to rotate in the same speed and the same direction through the power transmission piece 516, so that the two pipe fittings can be driven to move along the axial direction to be close to each other, and the coaxial butt joint between the two pipe fittings is realized.

The present utility model is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims

1. The utility model provides a correction butt joint method before large-scale pipe fitting welds, its includes base (100), installs two sets of mount pad (101) on base (100), and mount pad (101) can take place to remove, its characterized in that: every group all is provided with butt joint auxiliary device (200) on mount pad (101), butt joint auxiliary device (200) are including installation mechanism (300), install feed mechanism (400) on installation mechanism (300), feed mechanism (400) in two sets of butt joint auxiliary device (200) one end in opposite directions is provided with centre gripping correction mechanism (500), installation mechanism (300) are used for drawing feed mechanism (400) and centre gripping correction mechanism (500) to take place to remove along vertical direction, feed mechanism (400) are used for drawing centre gripping correction mechanism (500) and pipe fitting to take place to remove along the pipe fitting axial, centre gripping correction mechanism (500) are including two sets of centre gripping correction members, centre gripping correction member is provided with two kinds of states: the clamping state of the clamping pipe fitting and the correction state of the surface concave of the correcting pipe fitting are achieved, the clamping correction component comprises a driving component (501) and a clamping correction component (502), the clamping correction component (502) is used for clamping the pipe fitting or correcting the surface concave of the pipe fitting, and the driving component (501) is used for providing driving force for clamping or correcting of the clamping correction component (502);

which comprises the following steps:

step one: moving the pipe fitting to be welded between two groups of butt joint auxiliary devices (200) through hoisting equipment;

step two: the feeding mechanism (400) pulls the clamping correcting mechanism (500) to move, so that the clamping correcting mechanism (500) stretches into the pipe fitting;

step three: the driving assembly (501) operates to drive the clamping correction assembly (502) to coaxially and self-centering inner clamp the pipe, and after clamping is finished, the hoisting equipment loosens the pipe and leaves;

step five: the two groups of mounting seats (101) are close to each other, so that the two pipe fittings are close to each other, and then the feeding mechanism (400) pulls the clamping correction mechanism (500) to move with the pipe fittings, so that the two pipe fittings are finally coaxially butted.

2. The method for correcting and butting large pipe fittings before welding according to claim 1, wherein the method comprises the following steps: the feeding mechanism (400) comprises a threaded column (401) arranged on the mounting frame (304), the interior of the threaded column (401) is hollow and axially parallel to the moving direction of the mounting seat (101), the threaded column (401) can only move axially or only rotate around the axial direction, the threaded column (401) is axially divided into a threaded section and a smooth section, the threaded section is connected with the feeding mechanism (400), and the smooth section is used for mounting the clamping correction mechanism (500).

3. The method for correcting and butting large pipe fittings before welding according to claim 2, wherein: in the fifth step, after the two pipes are coaxially butted, the clamping correction mechanism (500) and the pipe clamped by the clamping correction mechanism can be rotated together through the rotation of the threaded column (401), so that welding seams a on the two pipes are staggered, and the welding seams a refer to welding positions in the pipe machining and forming process.

4. The method for correcting and butting large pipe fittings before welding according to claim 2, wherein: the clamping correction assembly (502) comprises a fixing frame (503) and a clamping correction unit (504), the fixing frame (503) comprises a ferrule (505) coaxially sleeved outside a smooth section of a threaded column (401), a transverse frame (506) is extended at one end of the ferrule (505) away from the threaded section of the threaded column (401), the clamping correction unit (504) comprises a connecting frame (510), a connecting rod (507) is hinged between the connecting frame (510) and the transverse frame (506), the connecting rod (507) is provided with two groups along the axial direction of the ferrule (505), a ring frame (508) is slidably installed outside the ferrule (505), and a push-pull rod (509) is hinged between the ring frame (508) and the connecting rod (507).

5. The method for correcting and butting large pipe fittings before welding according to claim 4, wherein the method comprises the following steps: the correction frame (513) is rotatably mounted on the connecting frame (510), the axial direction of a rotating shaft (515) formed at the rotation mounting position is parallel to the axial direction of the ferrule (505), the input end of the rotating shaft (515) is in power connection with a motor five (511) arranged on the connecting frame (510), the outer wall of the correction frame (513) is arranged to be a correction cambered surface in a cambered surface shape, the clamping wheels (514) are rotatably mounted on the correction frame (513), the axial direction of the clamping wheels (514) is perpendicular to the axial direction of the rotating shaft (515), the clamping wheels (514) are provided with a plurality of groups along the axial array of the threaded column (401), the plurality of groups of clamping wheels (514) are in power connection with a motor six (512) arranged on the connecting frame (510) through a power transmission piece (516), and the clamping correction units (504) in each group of clamping correction members are arranged in an array along the circumferential direction of the ferrule (505) in a plurality of groups, and the groups of clamping correction units (504) in the two groups of the clamping correction members are arranged in a staggered mode.

6. The method for correcting and butting large pipe fittings before welding according to claim 5, wherein the method comprises the following steps: in the clamping process of the third step, the following steps are adopted:

s31: the driving assembly (501) drives the clamping wheel (514) to be close to the inner wall of the pipe fitting and realizes the inner clamping of the pipe fitting;

s32: the motor six (512) operates to drive the clamping wheel (514) to rotate, and the clamping wheel (514) rotates to draw the pipe fitting to move along the axial direction, so that the parts of the clamping correction unit (504) positioned on two sides of the center of the pipe fitting are symmetrically arranged.

7. The method for correcting and butting large pipe fittings before welding according to claim 5, wherein the method comprises the following steps: the driving assembly (501) comprises a motor frame arranged inside the threaded column (401), a motor seven (522) and a motor eight (523) are arranged on the motor frame, the driving assembly (501) further comprises an outer casing (517) coaxially sleeved outside the smooth section of the threaded column (401) in a rotating mode, the outer casing (517) is fixedly connected with a ferrule (505), a first screw rod (518) is arranged between the outer casing (517) and the ring frame (508), the input end of the first screw rod (518) stretches into the outer casing (517), the first screw rod (518) is in threaded connection with the ring frame (508), the axial direction of the first screw rod (518) is parallel to the axial direction of the threaded column (401), a plurality of groups are arranged on the first screw rod (518) along the circumferential direction array of the threaded column (401), power connection is achieved between the input end of the first screw rod (518) and the motor seven (522) through a third power connection piece (520), and power connection is achieved between the outer casing (517) and the motor eight (523) through a fourth power connection piece (521).

8. The method for correcting and butting large pipe fittings before welding according to claim 1, wherein the method comprises the following steps: the docking assistance device (200) further comprises a balancing member (600), wherein the balancing member (600) is correspondingly matched with the clamping correction mechanism (500) and is respectively positioned at two sides of the mounting mechanism (300), and the balancing member (600) is used for forming gravity balance with the clamping correction mechanism (500).