CN214770091U - Ring welding equipment - Google Patents

Abstract

The utility model provides a girth welding equipment relates to welding equipment technical field, include: the welding robot comprises a base, a swing mechanism, a lifting mechanism, a clamping mechanism and a welding robot; the rotating assembly can drive the workpiece arranged in the placing area to rotate along the axis of the first direction; the lifting mechanism comprises at least two centering components, and each centering component is respectively configured on a walking sliding seat; the clamping mechanism comprises a clamping assembly and a jacking assembly, the clamping assembly can limit and clamp one end of a workpiece which is hoisted and placed into the placing area along a third direction, and the driven assembly moves to be close to the other end of the workpiece to drive the jacking assembly to limit and abut against the workpiece along the first direction; the automatic welding system is suitable for automatic clamping and welding of large long-tube-shaped workpieces in engineering machinery, provides a more automatic and simpler welding system, greatly reduces the labor intensity of operators, improves the working environment of the operators, improves the operation safety of the operators, and obviously reduces the production cost of enterprises.

Description

Ring welding equipment

Technical Field

The utility model relates to a welding equipment technical field particularly, relates to a girth welding equipment.

Background

With the rapid development of economy, the length of hydraulic elements such as hydraulic cylinders widely used in engineering machinery and equipment is also continuously lengthened, so that parts have the properties of being large, heavy and various. Aiming at the welding of a long pipe type workpiece, at present, no special equipment is provided, workers select different tool assemblies to work according to different diameters and lengths of the workpiece, even the workpiece is too long to be machined, the operation is inconvenient in the state, the efficiency is low, the requirement on the labor intensity of operators is high, and certain potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a girth welding equipment aims at improving current girth welding equipment and is difficult to welding operation and inefficiency scheduling problem to the work piece.

The utility model adopts the following scheme:

the application provides a girth welding equipment for clamping and welding of long cast work piece includes: the welding robot comprises a base, a swing mechanism, a lifting mechanism, a clamping mechanism and a welding robot; the base extends along a first direction and is provided with a plurality of walking sliding seats which are independent from each other, and each walking sliding seat can perform position adjustment in a sliding mode along the arrangement direction of the base; the slewing mechanism comprises a rotating assembly and a driven assembly which are arranged on two end sides of the base in a mutually opposite mode along a first direction; the rotating assembly is fixedly arranged at one end of the base, the driven assembly is arranged on the walking sliding seat and can form a placing area for accommodating a workpiece with the rotating assembly, and the rotating assembly can drive the workpiece placed in the placing area to rotate along the axis of the first direction; the lifting mechanism is arranged in the placing area and comprises at least two centering assemblies, and each centering assembly is respectively arranged on one walking sliding seat; the centering assembly comprises two supporting pieces which are synchronously and centrally close to or far away from each other along the second direction, and the supporting pieces are mutually opposite to form a supporting surface for supporting the workpiece and transversely arranging the workpiece in the placing area along the first direction; the clamping mechanism comprises a clamping assembly arranged on one side of the rotating assembly and a jacking assembly arranged on one side of the driven assembly, the clamping assembly can enable one end of a workpiece which is hoisted and placed in the placing area to be limited and clamped along a third direction, and the driven assembly moves to be close to the other end of the workpiece to drive the jacking assembly to be limited and abutted to the workpiece along a first direction; the welding robot is movably disposed on one side of the base and is capable of performing a welding operation on a workpiece within a welding zone.

As a further improvement, the rotating assembly comprises a first machine body arranged on a walking sliding seat, a rotating disc rotatably arranged on one side of the first machine body and a motor for driving the rotating disc to rotate relative to the machine body; the motor and the turntable are in transmission connection in a gear meshing mode, and the clamping assembly is arranged on the turntable.

As a further improvement, the driven assembly comprises a second machine body arranged on the other walking slide seat and an electric push rod which is rotatably arranged on one side of the second machine body; the jacking assembly is arranged at the output end of the push rod, and the jacking assembly and the clamping assembly are approximately at the same horizontal height and are arranged opposite to each other.

As a further improvement, the first machine body and the rotary table, and the second machine body and the electric push rod are matched in a pivoting support mode.

As a further improvement, the clamping assembly is a clamping chuck, and the swing mechanism further comprises a locking assembly which is arranged on the first machine body and can move along a second direction to limit the rotation of the clamping chuck; the locking assembly comprises a sliding part arranged on one side of the first machine body and a limiting part arranged on the sliding part, the limiting part can be driven by the sliding part to move along the direction close to or away from the chuck, and the limiting part is elastically abutted to one side of the chuck in a plug-in matching mode when the limiting part is close to the chuck.

As a further improvement, the tightening means is configured as a taper body engageable with and abutted against the end surface portion of the workpiece.

As a further improvement, the lifting surfaces of the same centering assembly are constructed into V-shaped structures which can be matched with the pipe diameter of the workpiece, and the supporting piece passes through the rubber roller so that the workpiece can rotate relative to the lifting surfaces.

As a further improvement, the bearing piece is approximately in a wedge-shaped seat, rubber rollers with different sizes are respectively arranged at the top and the bottom of the bearing surface, and the outer side of each rubber roller forms part of the bearing surface.

As a further improvement, the supporting pieces of the same centering assembly synchronously approach or depart from each other in a sliding manner in the second direction, so that the opening degree of a V-shaped structure formed between the two supporting surfaces is adjustable; and the workpiece body arranged on the bearing surface can at least abut against rubber rollers at the same horizontal height on different bearing pieces.

The application also provides a welding method, which is used for clamping and welding the long tubular workpiece by using the girth welding equipment, and comprises the following steps:

pre-adjusting a placing interval between a rotating assembly and a driven assembly of the slewing mechanism according to the size parameters of the workpiece;

the walking slide seat is utilized to drive the centering component of the lifting mechanism to move along a first direction to be matched with the length size of the workpiece for supporting, and the supporting piece of the centering component moves along a second direction to adjust the opening degree of the lifting surface of the centering component, so that the supporting piece can be matched with the width size of the workpiece;

hoisting a workpiece in a third direction, placing the workpiece into a placing area, supporting the workpiece on the lifting mechanism, and adjusting the driven assembly again to enable the driven assembly to drive the workpiece to be abutted against the clamping assembly close to the other side through the abutting assembly under the driving of the traveling slide seat so as to limit and clamp the workpiece between the clamping assembly and the abutting assembly;

driving the rotating assembly to drive the workpiece clamped in the placing area to rotate along the axis of the first direction, and performing girth welding operation on the to-be-welded station through the welding robot;

wherein, the girth welding operation at least comprises in sequence: welding the workpiece by argon tungsten-arc welding to form a coating welding seam; overlaying by adopting a cold spraying process to form a transition layer welding seam; and welding the base layer by adopting gas metal arc welding or arc welding to form a base layer welding seam.

By adopting the technical scheme, the utility model discloses can gain following technological effect:

the utility model provides a girth welding equipment is applicable to automatic clamping and the welding of the large-scale long cast type work piece among the engineering machine tool, and it provides more automatic, the welding system of portably, greatly reduced operation workman's intensity of labour, improved workman's operational environment, improved workman's operation safety, is showing the manufacturing cost who has reduced the enterprise. The rotary mechanism and the lifting mechanism are flexibly configured on the base, position adjustment can be carried out according to size parameters of workpieces, the rotary mechanism and the lifting mechanism are adaptive to clamping and placing of workpieces of various sizes, the workpieces placed in a placing area are clamped and pushed tightly through limiting of the clamping mechanism, the workpieces can rotate along the axis direction of the first direction under the driving of the rotary mechanism, and the workpieces are supported and kept on the bearing assembly all the time, so that clamping and placing are more stable and efficient, the ring welding operation of a welding robot on the workpieces at the welding area is facilitated, the welding effect is remarkable, and the working efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a girth welding device according to an embodiment of the present invention at a first viewing angle;

fig. 2 is a schematic structural diagram of a girth welding device according to an embodiment of the present invention at a second viewing angle;

fig. 3 is a schematic structural diagram of a part of a girth welding device according to an embodiment of the present invention, wherein the part is shown in an enlarged manner for convenience of illustration;

fig. 4 is a schematic structural view of another part of the girth welding device according to the embodiment of the present invention, wherein the part is shown in an enlarged manner for convenience of illustration;

fig. 5 is a block flow diagram of a welding method according to an embodiment of the present invention.

Icon: 1-a base; 11-a walking slide seat; 2-a slewing mechanism; 21-a rotating assembly; 211-a first body; 212-a turntable; 213-a motor; 22-a driven assembly; 221-a second body; 222-an electric push rod; 23-a locking assembly; 231-a slide; 232-a limiting member; 3-a lifting mechanism; 31-a centering assembly; 311-a support; 312-rubber roll; 4-a clamping mechanism; 41-clamping component; 42-a jacking assembly; 5-a welding robot; a-a workpiece; x-a first direction; y-a second direction; z-third direction.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

With reference to fig. 1 to 4, the present embodiment provides a girth welding device for clamping and welding a long tubular workpiece, including: the welding robot comprises a base 1, a rotating mechanism 2, a lifting mechanism 3, a clamping mechanism 4 and a welding robot 5. The base 1 is arranged extending in a first direction X and has a plurality of travelling carriages 11 arranged independently of one another, each travelling carriage 11 being able to be adjusted in position in a sliding manner in the direction of arrangement of the base 1. The turning mechanism 2 includes a turning unit 21 and a driven unit 22 provided on both end sides of the base 1 to face each other in the first direction X. The rotating assembly 21 is fixedly arranged at one end of the base 1, the driven assembly 22 is arranged on a walking slide 11 and can form a placing area for accommodating the workpiece a with the rotating assembly 21, and the rotating assembly 21 can drive the workpiece a placed in the placing area to rotate along the axis of the first direction X. The lifting mechanism 3 is disposed in the placement area, the lifting mechanism 3 includes at least two centering assemblies 31, and each centering assembly 31 is disposed on a traveling slide 11. The centering assembly 31 comprises two supporting members 311 synchronously centering close to or far away from each other along the second direction Y, and the supporting members 311 are mutually opposite to form a supporting surface for supporting the workpiece a transversely arranged in the placing area along the first direction X. The clamping mechanism 4 comprises a clamping assembly 41 arranged on one side of the rotating assembly 21 and a jacking assembly 42 arranged on one side of the driven assembly 22, the clamping assembly 41 can enable one end of a workpiece A which is hoisted and placed in the placing area to be limited and clamped along the third direction Z, and the driven assembly 22 moves to the other end close to the workpiece A to drive the jacking assembly 42 to be limited and abutted to the workpiece A along the first direction X. The welding robot 5 is movably disposed on the base 1 side and can perform a welding operation on the workpiece a in the welding zone.

The girth welding equipment in the embodiment is suitable for automatic clamping and welding of a large long tubular workpiece A in engineering machinery, provides a more automatic and simpler welding system, greatly reduces the labor intensity of operators, improves the working environment of the operators, improves the operation safety of the operators, and obviously reduces the production cost of enterprises. The rotary mechanism 2 and the lifting mechanism 3 are flexibly configured on the base 1, position adjustment can be performed according to size parameters of the workpiece A, the rotary mechanism is adaptive to clamping and placing of workpieces A of various sizes, the workpieces A placed in a placing area are clamped and jacked tightly through limiting of the clamping mechanism 4, the workpieces A can rotate along the axis direction of the first direction X under the driving of the rotary mechanism 2, and are supported and kept on the bearing assembly all the time, clamping and placing are more stable and efficient, the welding robot 5 is beneficial to performing girth welding operation on the workpieces A in a welding area, the welding effect is obvious, and the working efficiency is improved.

It should be noted that the first direction X, the second direction Y and the third direction Z are all perpendicular to each other.

In one embodiment, the rotating assembly 21 includes a first body 211 disposed on a traveling carriage 11, a turntable 212 rotatably disposed on one side of the first body 211, and a motor 213 for driving the turntable 212 to rotate relative to the body. The motor 213 and the turntable 212 are in transmission connection in a gear engagement manner, and the clamping assembly 41 is arranged on the turntable 212. Correspondingly, the driven assembly 22 includes a second body 221 disposed on the other traveling carriage 11 and an electric push rod 222 rotatably disposed on one side of the second body 221. Wherein, the jacking component 42 is arranged on the output end of the push rod, and the jacking component 42 and the clamping component 41 are approximately at the same horizontal height and are arranged opposite to each other. The power source in the turning mechanism 2 is configured in such a manner that the speed reducer drives the turning by the motor 213. Specifically, the driving source directly transmits the power of the motor 213 to the turntable 212 through a gear engagement connection, and the driven assembly 22 can rotate together to rotate integrally along the axis of the first direction X. Adopt accurate speed reducer and add external shaft motor 213, the output of motor 213 can mesh the transmission with slewing bearing mutually for the gyration mode is more steady, high-efficient. The first body 211 and the rotating disc 212, and the second body 221 and the electric push rod 222 are rotatably supported. The slewing bearing is a large bearing capable of bearing comprehensive loads, and can simultaneously bear larger axial and radial loads and overturning moments, so that efficient slewing configuration is facilitated.

Referring to fig. 2, 3 and 4, in one embodiment, the clamping assembly 41 is a clamping chuck. The swing mechanism 2 further includes a locking assembly 23 disposed on the first body 211 and movable in the second direction Y to limit chuck rotation. The locking assembly 23 includes a sliding member 231 disposed on one side of the first body 211 and a limiting member 232 disposed on the sliding member 231, wherein the limiting member 232 can be driven by the sliding member 231 to move in a direction approaching or departing from the chuck, and is elastically abutted to one side of the chuck in a manner of insertion fit when approaching the chuck. Specifically, the slide member 231 is driven by an external air cylinder (not shown) to reciprocate in the second direction Y, and the stopper 232 disposed on the slide member 231 can be moved toward or away from the chuck in the pushing direction of the air cylinder. When the turntable 212 drives the workpiece a to rotate to a predetermined position through the chuck, the limiting member 232 moves from a position away from the chuck to a position abutting against one side of the chuck, so as to perform a foolproof protection function when the workpiece a does not need to rotate, and ensure the stability of the ring welding workpiece a. Particularly, the limiting member 232 is configured as a rod body sleeved with an elastic pad, and a fastening groove (not shown) is correspondingly formed in one side of the chuck, so that the end of the rod body can be inserted into the fastening groove, and the elastic force of the elastic pad is abutted against the limiting member 232 and the chuck to keep elastic tight fit all the time, thereby avoiding damage to the chuck or the limiting member 232.

In one embodiment, the tightening unit 42 is preferably configured as a cone that can be engaged against the end surface portion of the workpiece a. The conical body is favorable for tightly matching the workpiece A in the placing area in a jacking manner, so that the workpiece A is driven to tightly match the end face of the workpiece A in a jacking manner under the driving of the walking slide seat 11, and the workpiece A is driven to tightly jack up and clamped in the placing area further under the limiting clamp of the clamping component 41 on the other side.

Referring to fig. 2 and 4, the lift mechanism 3 is further described. Wherein, the lifting surface of the same centering component 31 is constructed into a V-shaped structure which can adapt to the pipe diameter of the workpiece A, and the supporting piece 311 passes through the rubber roller 312 so that the workpiece A can rotate relative to the lifting surface. Specifically, the supporting member 311 is substantially a wedge-shaped seat, and rubber rollers 312 with different sizes are respectively arranged at least at the top and the bottom of the supporting surface, and the outer side of each rubber roller 312 forms part of the supporting surface. Therefore, the bearing surface is formed on the side where the two wedge-shaped seats are opposite to each other, so that the rubber roller 312 is matched with the bearing surface to lift the body of the workpiece A, and the workpiece A can be allowed to be matched with the bearing surface in a rolling mode through the rubber roller 312, so that the friction resistance during rotation is reduced, and the lifting operation of the workpiece A in the rotation process is facilitated.

In one embodiment, the supporting members 311 of the same centering assembly 31 move closer to or away from each other in a sliding manner in the second direction Y, so that the opening degree of the V-shaped structure formed between the two supporting surfaces is adjustable. And the body of the workpiece a placed on the bearing surface can at least abut against the rubber rollers 312 at the same level on different bearing pieces 311. It should be noted that the two supporting members 311 of the centering assembly 31 may be disposed on respective nut seats of the bidirectional screw rod, and the screw rod is driven by an external force to rotate so that the two nut seats are synchronously close to or far away from each other, so that the two supporting members 311 adjust the distance therebetween, and the opening degree of the lifting surface is correspondingly adjusted to be larger or smaller, so as to adapt to the pipe diameter of the workpiece a in the width direction. In addition, the diameter of the workpiece a satisfies the distance between two rubber rollers 312 with the same height, which is larger than the bottom, so that the workpiece a placed on the bearing surface can be at least supported between the rubber rollers 312 with the same height, and the workpiece a can be configured on the bearing surface in a rolling manner.

It should be mentioned that the position of the plurality of traveling sliders 11 on the base 1 can be adjusted by slidably configuring the traveling sliders 11 on the guide rails on the base 1, and driving the traveling sliders 11 to move back and forth in a rack and pinion manner by the power sources on the respective sliders. The travelling carriage 11, in which the centering assembly 31 is located, is located between the rotating assembly 21 and the driven assembly 22. The walking carriages 11 can share the same guide rail to realize walking on the base 1. In particular, the welding robot 5 may be configured to move on the base 1 side by the welding robot 5, and the base 1 may be moved by itself and arranged in parallel with the guide rail on the base 1 on different paths, so that the welding robot 5 can move flexibly without interference, and the welding operation of the workpiece a on the welding area can be facilitated. In addition, the workpiece a may be subjected to a repair welding process in the girth welding equipment of the present application, or subjected to girth welding after the workpiece to be welded and the workpiece are butted, which is not limited herein.

With reference to fig. 2 and fig. 5, the present embodiment further provides a welding method for clamping and welding the long tubular workpiece a by using the above-mentioned girth welding device, which includes the following steps:

s1: the placement interval between the rotating assembly 21 and the driven assembly 22 of the turning mechanism 2 is pre-adjusted according to the dimensional parameters of the workpiece a.

S2: the walking slide 11 is utilized to drive the centering component 31 of the lifting mechanism 3 to move along the first direction X to be matched with the length dimension of the workpiece a for supporting, and the supporting piece 311 of the centering component 31 moves along the second direction Y to adjust the opening degree of the lifting surface, so that the supporting piece 311 can be matched with the width dimension of the workpiece a.

S3: the workpiece A is hoisted along the third direction Z and placed in the placing area and supported on the lifting mechanism 3, the driven assembly 22 is adjusted again to enable the driven assembly to drive the workpiece A to be abutted against the clamping assembly 41 close to the other side through the abutting assembly 42 under the driving of the walking slide 11, and the workpiece A is clamped between the clamping assembly 41 and the abutting assembly 42 in a limiting mode.

S4: and driving the rotating assembly 21 to drive the workpiece A clamped in the placing area to rotate along the axis of the first direction X, and performing girth welding operation on the position to be welded through the welding robot 5.

Wherein, the girth welding operation at least comprises in sequence: and welding the workpiece A by adopting argon tungsten-arc welding to form a coating welding seam. And overlaying by adopting a cold spraying process to form a transition layer welding seam. And welding the base layer by adopting gas metal arc welding or arc welding to form a base layer welding seam.

In one embodiment, in particular, the thickness of the weld of the cladding layer is 1-2mm, the thickness of the weld of the transition layer is 2-4mm, and the thickness of the weld of the base layer is 4-8 mm. The girth welding mode can effectively solve the problem that a large amount of coating alloy elements generated by traditional welding are flushed, mixed and diffused, has a good isolation effect, realizes high-quality and high-efficiency welding, is low in welding cost, and is easy to realize automatic production.

It needs to be mentioned that, in the preparation process of clamping, welding, place the interval through adjusting for place the hoist and mount that the district can the adaptation of placing the work piece A and put into, and place the interval and be greater than work piece A length. And then the position of the lifting mechanism 3 is adjusted, so that the workpieces A with different lengths can be lifted at intervals, and the stress is stable. After the lifting of the workpiece a is finished, the end of the workpiece a cannot be guaranteed to be directly limited and clamped by the clamping assembly 41 on the rotating assembly 21, the workpiece a needs to be abutted against the first direction X by the abutting assembly 42 arranged on the driven assembly 22 at the other end of the workpiece a in a slidable manner to drive the workpiece a to move along the placing area to the end of the workpiece a to be clamped and clamped on the clamping assembly 41, at the moment, both ends of the workpiece a are in a limited and fixed state, so that the workpiece a is stably clamped between the rotating mechanisms 2, and the workpiece a is rotated to adjust the station thereof under the driving of the rotating assembly 21, thereby facilitating the girth welding operation.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.

Claims (9)

1. The utility model provides a girth welding equipment for clamping and welding of long cast work piece, its characterized in that includes:

the device comprises a base, a first positioning device and a second positioning device, wherein the base is arranged in an extending manner along a first direction and is provided with a plurality of walking sliding seats which are mutually independent, and each walking sliding seat can perform position adjustment in a sliding manner along the arrangement direction of the base;

the rotary mechanism comprises a rotating assembly and a driven assembly which are arranged on two end sides of the base in a mutually opposite mode along a first direction; the rotating assembly is fixedly arranged at one end of the base, the driven assembly is arranged on the walking sliding seat and can form a placing area for accommodating a workpiece with the rotating assembly, and the rotating assembly can drive the workpiece placed in the placing area to rotate along the axis of the first direction;

the lifting mechanism is arranged in the placing area and comprises at least two centering components, and each centering component is respectively configured on one walking sliding seat; the centering assembly comprises two supporting pieces which are synchronously and centrally close to or far away from each other along the second direction, and the supporting pieces are mutually opposite to form a supporting surface for supporting the workpiece and transversely arranging the workpiece in the placing area along the first direction;

the clamping mechanism comprises a clamping assembly and a jacking assembly, the clamping assembly is arranged on one side of the rotating assembly, the jacking assembly is arranged on one side of the driven assembly, the clamping assembly can enable one end of a workpiece which is hoisted and placed in the placing area to be limited and clamped along a third direction, and the driven assembly moves to be close to the other end of the workpiece to drive the jacking assembly to be limited and abutted to the workpiece along a first direction;

and a welding robot movably disposed on one side of the base and capable of performing a welding operation on the workpiece in the welding zone.

2. The apparatus according to claim 1, wherein the rotary assembly comprises a first body disposed on a traveling carriage, a rotary table rotatably disposed on one side of the first body, and a motor for rotating the rotary table relative to the body; the motor and the turntable are in transmission connection in a gear meshing mode, and the clamping assembly is arranged on the turntable.

3. The ring welding apparatus according to claim 2, wherein the driven assembly comprises a second body disposed on the other traveling carriage and an electric push rod rotatably disposed at one side of the second body; the jacking assembly is arranged at the output end of the push rod, and the jacking assembly and the clamping assembly are approximately at the same horizontal height and are arranged opposite to each other.

4. The ring welding device according to claim 3, wherein the first body and the rotary table and the second body and the electric push rod are matched in a pivoting manner.

5. The apparatus according to claim 2, wherein the clamping assembly is a clamping chuck, and the rotation mechanism further comprises a locking assembly disposed on the first body and movable in a second direction to limit rotation of the chuck;

the locking assembly comprises a sliding part arranged on one side of the first machine body and a limiting part arranged on the sliding part, the limiting part can be driven by the sliding part to move along the direction close to or away from the chuck, and the limiting part is elastically abutted to one side of the chuck in a plug-in matching mode when the limiting part is close to the chuck.

6. The apparatus of claim 3 wherein the puller assembly is configured as a cone engageable against the end face of the workpiece.

7. The girth welding apparatus of claim 1, wherein the lifting surfaces of the same centering assembly are configured as a V-shaped structure adapted to the diameter of the pipe of the workpiece, and the support member passes over a rubber roller to allow the workpiece to rotate relative to the lifting surfaces.

8. The apparatus according to claim 7, wherein the support member is substantially in the form of a wedge-shaped seat and is provided with rubber rolls of different sizes at least at the top and at the bottom of the support surface, respectively, the outer side of each rubber roll forming part of the support surface.

9. The apparatus according to claim 8, wherein the supporting members of the same centering assembly are moved synchronously closer to or farther from each other in a sliding manner in the second direction, so that the opening degree of the V-shaped structure formed between the two supporting surfaces is adjustable; and the workpiece body arranged on the bearing surface can at least abut against rubber rollers at the same horizontal height on different bearing pieces.

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