Automatic flange centering and welding device

Abstract

The utility model relates to the technical field of flange centering welding, in particular to an automatic flange centering welding device which comprises a base, a centering mechanism installed on the base, a pressing air cylinder installed on the base and used for pressing a flange and a displacement mechanism used for driving the base to move in a reciprocating mode. The centering mechanism comprises a centering assembly and a power part, the power part drives the centering assembly to synchronously move towards the periphery in the radial direction and is fixedly installed relative to the base, the centering assembly synchronously moves towards the periphery in the radial direction and is used for supporting the inner diameter of a steel pipe, and a positioning pin is further installed on the centering mechanism. The positioning pin is used for solving the technical problems that in the prior art, when a steel pipe and a flange are subjected to centering welding, the steel pipe is prone to deformation, and the product rejection rate is high due to the poor centering performance of the steel pipe and the flange.

Description

Technical Field

[0001] The utility model relates to the technical field of flange centering welding, in particular to an automatic flange centering welding device. Background Art

[0002] In the production and processing of steel pipes, the butt joint of steel pipes requires welding the steel pipes and flanges to make them one body. Usually, the flanges and steel pipes are positioned respectively, and then the two are butted and welded. The utility model patent disclosed in the prior art is named "a convenient butt joint steel pipe and flange welding mold, and the announcement number is: CN211305407U, which includes a fixed disc, a mounting steel pipe and a mounting flange. A fixed steel pipe is arranged at the middle position above the fixed disc, and a limited position steel pipe is arranged above the fixed steel pipe, and a limited position flange is arranged outside the fixed steel pipe, the bottom of the mounting steel pipe is arranged above the fixed steel pipe, and the outer side of the bottom of the mounting steel pipe is arranged on the inner side of the mounting flange, and the mounting flange surface A welding point is provided at the connection between the surface and the installation steel pipe. The technical solution disclosed in the patent utilizes the connection work between the limit flange and the limit steel pipe to facilitate the docking work between the installation flange and the installation steel pipe. However, there are still many problems such as: ① After the flange is docked with the steel pipe, the installation steel pipe and the limit steel pipe are slid and inserted by rollers, and there must be a gap between the two. During the welding process, the installation steel pipe will still be slightly deformed into an ellipse; ② Due to the gap between the installation flange and the limit flange, the alignment of the steel pipe and the flange is relatively poor during installation welding, which leads to serious deformation of the steel pipe after welding, and the roundness does not meet the product qualification standards, resulting in the scrapping of the steel pipe and a high product scrap rate. Utility Model Content

[0003] The utility model aims to provide an automatic centering welding device for flanges, which is used to solve the technical problems in the prior art of high product scrap rate caused by easy deformation of steel pipes and poor centering of the steel pipes and flanges during centering welding.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The automatic centering welding device for flanges comprises a base, a centering mechanism installed on the base, a clamping cylinder installed on the base for clamping the flange, and a displacement mechanism for driving the base to reciprocate. The centering mechanism comprises a centering component and a power unit that drives the centering component to move synchronously in radial directions and is fixedly installed relative to the base. The centering component moves synchronously in radial directions to support the inner diameter of the steel pipe. A positioning pin is also installed on the centering mechanism. The positioning pin is inserted into and matched with the pin hole of the flange to realize the positioning of the flange.

[0006] Furthermore, the centering component includes a supporting mold, a mold base and a cone, the cone and the supporting mold are tapered insertion fit, the supporting mold and the mold base are straight surface insertion fit, the supporting mold and the mold base are both configured to consist of at least two separate parts, the cone moves axially close to the supporting mold so that the separate part of the supporting mold moves radially outward, and the separate part of the supporting mold moves radially outward so that the separate part of the mold base moves radially outward.

[0007] Furthermore, the centering assembly also includes a reset mechanism, which includes a sleeve disk fixedly installed relative to the power unit and a plurality of movable rods radially slidably installed in the sleeve disk, the number and position of the movable rods correspond to the number and position of the splits supporting the mold, one end of the movable rod close to the axis of the sleeve disk is connected one-to-one with the splits supporting the mold, and an elastic member is installed between the movable rod and the sleeve disk, which is used to move the movable rod radially in a direction tending to the axis of the sleeve disk.

[0008] Furthermore, the support mold has four split parts, each of which includes a fan-shaped support part and a mating end connected thereto in the axial direction, the fan-shaped angles of the four fan-shaped support parts are all 90°, and the four fan-shaped support parts form a disk when the axial displacement is minimum, the radial cross-section of the four mating ends is square when the axial displacement is minimum, and the four fan-shaped support parts are provided with inclined surfaces on one side close to the axis, and the inclined surfaces of the four fan-shaped support parts form a mating tapered hole, which is inserted and mated with the external shape of the cone.

[0009] Furthermore, the mold base has four split parts, each of which is a fan-shaped support part. The fan-shaped angles of the four fan-shaped support parts are all 90°, and a disk is formed when the radial displacement is minimum. Straight faces are arranged on one side of the four fan-shaped support parts close to the axis, and the straight faces of the four fan-shaped support parts constitute matching straight holes that are inserted into and matched with the four matching ends of the supporting mold.

[0010] Furthermore, the centering mechanism also includes a connecting disk and a connecting frame. The connecting disk is detachably mounted on the sleeve disk. The sleeve disk is fixedly mounted relative to the power unit through the connecting frame. The positioning pin is mounted on the connecting disk. The positioning pin is inserted into and cooperated with the pin hole on the flange for positioning. Each fan-shaped support portion of the mold base is also provided with a limiting hole passing through the axial direction. A fastener is installed through the limiting hole. One end of the fastener passes through the pressure plate for fastening, and the other end is mounted on the connecting disk. When the fan-shaped support portion moves back and forth in the radial direction, it is guided and limited by the fastener.

[0011] Furthermore, the hole groove of the limiting hole is arranged in the radial direction and is opened on one side close to the outer circumferential surface of the fan-shaped support portion.

[0012] Furthermore, a mounting groove is provided on one side of the fan-shaped support portion where the end of the moving rod is mounted, and the mounting groove is inserted into and matched with the end of the moving rod and can be detachably mounted by screws.

[0013] Furthermore, the displacement mechanism includes a displacement cylinder, a fixed end of which is mounted on a base frame, a power end of which is connected to a displacement plate vertically mounted on the base, the power part is a centering cylinder and is mounted on the displacement plate, and a slider is also installed at the bottom of the base, which is slidably mounted in cooperation with a guide rail mounted on the base frame.

[0014] Furthermore, a mechanical arm is installed on the upper surface of the base, and the mechanical arm is used to perform welding operations on the positioned steel pipes and flanges.

[0015] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0016] (1) The utility model provides a centering mechanism to support the steel pipe to be welded from the inside thereof by means of a centering assembly, and the support adopts a synchronous movement in the radial direction outward, and the flange is positioned by means of a positioning pin, which prevents the steel pipe from being deformed and helps to improve the centering effect, thereby improving the welding quality of the steel pipe and the flange and improving the yield rate;

[0017] (2) The utility model adopts the supporting mold, the mold base and the cone to cooperate with each other, and uses the cone surface to realize the synchronous movement of the mold base in the radial direction, so as to achieve high-precision centering of the steel pipe and the flange;

[0018] (3) The utility model provides a reset mechanism. When the steel pipe needs to be supported from the inside, the cone opens the support mold axially, thereby driving the moving rod to move. When the supporting action is completed, the moving rod is reset under the action of the elastic member;

[0019] (4) The utility model sets a displacement mechanism to drive the centering mechanism to move back and forth horizontally, thereby realizing the automatic docking of the steel pipe and the flange in the horizontal direction. With the help of the sliding of the guide rail and the slider, the flange and the steel pipe can be docked horizontally with high precision, thereby improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0022] Figure 3 It is a left-side structural schematic diagram of the utility model;

[0023] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle;

[0025] Figure 6 for Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0026] Figure 7 It is an exploded schematic diagram of the centering mechanism of the utility model;

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the centering component of the utility model;

[0028] Fig. 9 It is a three-dimensional structural schematic diagram of the mold base of the utility model;

[0029] Fig.10 This is a schematic diagram of the front three-dimensional structure of the supporting mold of the utility model;

[0030] Fig.11 It is a schematic diagram of the back three-dimensional structure of the supporting mold of the utility model.

[0031] In the figure, 1, base frame; 2, displacement cylinder; 3, guide rail; 4, base; 5, clamping cylinder; 6, cover plate; 7, pressure claw; 8, mechanical arm; 9, positioning pin; 10, centering cylinder; 11, cone; 12, mold base; 121, matching straight hole; 122, limit hole; 123, fan-shaped support; 13, displacement plate; 14, connecting frame; 15, moving rod; 16, sleeve disk; 17, supporting mold; 171, matching end; 172, matching tapered hole; 173, mounting groove; 174, fan-shaped support; 18, connecting disk; 19, reset spring; 20, pressure plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0034] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0035] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0036] In the description of this application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. The following is a further explanation of the present invention in conjunction with the accompanying drawings and embodiments.

[0038] In order to solve the limitations of the prior art, this embodiment provides a technical solution, and the technical solution of the utility model is further described below in conjunction with the drawings and embodiments.

[0039] See attached Figure 1-5The flange automatic centering welding device includes a box-shaped base 4, a centering mechanism installed on the base 4, a pressing cylinder 5 installed on the base 4 for pressing the flange, and a displacement mechanism for driving the base 4 to reciprocate. A mechanical arm 8 is also installed on the upper surface of the box-shaped base 4. The mechanical arm 8 is used to weld the positioned steel pipe and flange. The displacement mechanism includes a displacement cylinder 2. The fixed end of the displacement cylinder 2 is hingedly installed on the base frame 1. The base frame 1 is set as a quadrilateral frame. The power end of the displacement cylinder 2 is hingedly connected to the displacement plate 13 vertically installed on the base 4. The hinged connection here is conducive to realizing reciprocating movement. While reciprocating, the horizontality requirement of the cylinder is relatively low, and the horizontality of the reciprocating motion of the base 4 is achieved by the cooperation of the guide rail 3 and the slider; the power unit is a centering cylinder 10 and is horizontally installed on the displacement plate 13. Horizontal installation means that the axis of the centering cylinder 10 is along the horizontal direction. In addition, sliders are installed on both sides of the bottom of the base 4. The sliders are slidably installed with the guide rails 3 installed on both sides of the chassis 1. By setting a displacement mechanism, the centering mechanism is driven to move back and forth horizontally, thereby realizing the automatic docking of the steel pipe and the flange in the horizontal direction. With the help of the sliding cooperation of the guide rail 3 and the slider, the high-precision horizontal docking of the flange and the steel pipe is achieved, thereby improving the welding quality.

[0040] See attached Figure 4-7 The centering mechanism includes a centering component and a centering oil cylinder 10 that drives the centering component to move synchronously in the radial directions and is fixedly installed relative to the base 4. The centering component moves synchronously in the radial directions to support the inner diameter of the steel pipe. A positioning pin 9 is also installed on the centering mechanism. The positioning pin 9 is inserted into and matched with the pin hole of the flange to realize the positioning of the flange. By setting up the centering mechanism, the steel pipe to be welded is supported from the inside with the help of the centering component, and the support method adopts the method of synchronously moving radially outward. At the same time, the flange is positioned with the help of the positioning pin 9, which prevents the deformation of the steel pipe and is conducive to improving the centering effect, thereby improving the welding quality of the steel pipe and the flange and improving the yield rate. See the attached Figure 8-11 The centering assembly includes a supporting mold 17, a mold base 12 and a cone 11. The cone 11 and the supporting mold 17 are inserted into a conical surface. The axial reciprocating movement of the cone 11 will realize the radial reciprocating movement of the supporting mold 17. The supporting mold 17 and the mold base 12 are inserted into a straight surface. The radial reciprocating movement of the supporting mold 17 will realize the radial reciprocating movement of the mold base 12. The supporting mold 17 and the mold base 12 are both configured to be composed of four parts. The cone 11 moves axially close to the supporting mold 17 so that the parts of the supporting mold 17 move radially outward. The parts of the supporting mold 17 move radially outward so that the parts of the mold base 12 move radially outward. By using the supporting mold 17, the mold base 12 and the cone 11 to cooperate, the synchronous movement of the mold base 12 in the radial direction is realized by using the conical surface to cooperate, so as to realize the high-precision centering of the steel pipe and the flange. See the attached Figure 5-7The centering assembly also includes a reset mechanism, which includes a sleeve disk 16 fixedly installed relative to the power unit and four moving rods 15 radially slidably installed in the sleeve disk 16, and also includes a cover plate 6, the cover plate 6 and the moving rods 15 are installed on the sleeve disk 16 in a one-to-one correspondence, the number and position of the moving rods 15 correspond to the number and position of the split parts of the supporting mold 17, and the end of the moving rod 15 close to the axis of the sleeve disk 16 is connected to the split parts of the supporting mold 17 in a one-to-one correspondence. Specifically, a mounting groove 173 is set on the side where the fan-shaped support portion 174 is installed with the end of the moving rod 15, and the mounting groove 173 is inserted into and matched with the end of the moving rod 15 and can be detachably installed by screws. An elastic member is installed between the moving rod 15 and the sleeve disc 16. The elastic member adopts a reset spring 19. The reset spring 19 is used to move the moving rod 15 in the radial direction toward the axis of the sleeve disc 16. The reset spring 19 is sleeved on the moving rod 15 and one end is pressed against the cover plate 6, and the other end is pressed against the end surface of the channel in the sleeve disc 16. The channel is used for both ends of the moving rod 15 to pass through. By setting a reset mechanism, when it is necessary to support the steel pipe from the inside, the cone 11 axially expands the support mold 17, thereby driving the moving rod 15 to move. When the supporting action is completed, the moving rod 15 is reset under the action of the reset spring 19. See the attached Fig.10 and 11 The number of the split parts of the support mold 17 is four, and each split part of the support mold 17 includes a fan-shaped support part 174 and a matching end 171 connected thereto in the axial direction. The fan-shaped angles of the four fan-shaped support parts 174 are all 90°, and the four fan-shaped support parts 174 form a disc when the axial displacement is minimum. Here, the axial displacement is minimum, that is, the side surfaces of the four fan-shaped support parts 174 fit together to form a disc, and the four matching ends 171 are square in radial section when the axial displacement is minimum (here, the minimum displacement is synchronized with the minimum displacement of the fan-shaped support part 174), and the four fan-shaped support parts 174 are all provided with inclined surfaces on one side close to the axis, and the inclined surfaces here are that their extended lines intersect with the axis and have an angle, and the inclined surfaces of the four fan-shaped support parts 174 form a matching tapered hole 172, and the matching tapered hole 172 is inserted and matched with the external shape of the cone 11, and the cone 11 is set to a quadrangular pyramid shape, and the closer to the support mold 17, the smaller its size. See attached. Fig. 9 The mold base 12 has four split parts, and the split parts of the mold base 12 are fan-shaped support parts 123. The fan-shaped angles of the four fan-shaped support parts 123 are all 90°, and when the radial displacement is minimum (the minimum displacement here is synchronized with the minimum displacement of the supporting mold 17), a disk is formed. The four fan-shaped support parts 123 are all provided with straight faces on one side close to the axis, and the straight faces here are parallel to the axis. The straight faces of the four fan-shaped support parts 123 constitute matching straight holes 121 that are inserted and matched with the four matching ends 171 of the supporting mold 17.

[0041] See attached Figure 6 and 9The centering mechanism also includes a connecting plate 18 and a connecting frame 14. The connecting plate 18 is detachably mounted on the sleeve plate 16. The sleeve plate 16 is fixedly mounted relatively to the centering cylinder 10 through the connecting frame 14. The positioning pin 9 is mounted on the connecting plate 18. The positioning pin 9 is inserted into and matched with the pin hole on the flange for positioning. The clamping cylinder 5 is detachably mounted on the base 4 by screws, and the number is two. The power end of each clamping cylinder 5 is equipped with a pressing claw 7. When the clamping cylinder 5 is actuated, the pressing claw 7 is driven from vertical to horizontal, thereby aligning with the centering cylinder 10. The flange matched with the locating pin 9 is used for end face compression. Each fan-shaped support portion 123 of the mold base 12 is also provided with a limiting hole 122 which penetrates axially. A fastener is installed in the limiting hole 122. One end of the fastener passes through the pressure plate 20 for fastening, and the other end is threadedly installed on the connecting disk 18. When the fan-shaped support portion 123 reciprocates in the radial direction, it is guided and limited by the fastener. The hole groove of the limiting hole 122 is arranged radially and is opened on one side close to the outer circumferential surface of the fan-shaped support portion 123. The fastener here can be either a screw or a bolt.

[0042] When the flange automatic centering welding device disclosed by the utility model is used for welding, the flange is first matched with the positioning pin 9 to make it contact and tighten with the end face of the connecting plate 18, and at the same time, the pressing claw 7 is pressed on the outer end face of the flange by the action of the clamping cylinder 5. Here, the steel pipe is horizontally transported to the outside of the flange, and then the displacement cylinder 2 is actuated to drive the centering cylinder 10 to drive the centering mechanism and the flange to move forward axially, so that the flange and the steel pipe are docked, and the centering cylinder 10 is actuated to drive the cone 11 to move forward axially, and the conical surface of the cone 11 contacts the matching conical hole 172 of the supporting mold 17 to make the supporting mold 17 move radially outward, and at the same time, the matching end 171 of the supporting mold 17 drives the mold base 12 to move radially outward through the matching straight hole 121, so that the outer peripheral surface of the mold base 12 contacts the inner diameter of the steel pipe to form a support for the inner wall of the steel pipe, and then the robot arm 8 is actuated to weld the connection between the steel pipe and the flange.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Flange automatic centering welding device, characterized in that: The invention comprises a base (4), a centering mechanism installed on the base (4), a pressing cylinder (5) installed on the base (4) for pressing the flange, and a displacement mechanism for driving the base (4) to reciprocate. The centering mechanism comprises a centering component and a power unit driving the centering component to synchronously move radially in all directions and fixedly installed relative to the base (4). The centering component synchronously moves radially in all directions for supporting the inner diameter of the steel pipe. A positioning pin (9) is also installed on the centering mechanism. The positioning pin (9) is inserted into and matched with a pin hole of the flange to realize positioning of the flange.

2. The flange automatic centering welding device according to claim 1 is characterized in that: The centering component comprises a supporting mold (17), a mold base (12) and a cone (11); the cone (11) and the supporting mold (17) are in a conical surface insertion fit; the supporting mold (17) and the mold base (12) are in a straight surface insertion fit; the supporting mold (17) and the mold base (12) are both configured to consist of at least two separate parts; the cone (11) moves axially close to the supporting mold (17) so that the separate part of the supporting mold (17) moves radially outward; the separate part of the supporting mold (17) moves radially outward so that the separate part of the mold base (12) moves radially outward.

3. The flange automatic centering welding device according to claim 2 is characterized in that: The centering assembly also includes a reset mechanism, which includes a sleeve disk (16) fixedly installed relative to the power unit and a plurality of moving rods (15) radially slidably installed in the sleeve disk (16), the number and position of the moving rods (15) corresponding to the number and position of the split parts of the supporting mold (17), one end of the moving rod (15) close to the axis of the sleeve disk (16) is connected to the split parts of the supporting mold (17) in a one-to-one correspondence, and an elastic member is installed between the moving rod (15) and the sleeve disk (16), and the elastic member is used to move the moving rod (15) radially toward the axis of the sleeve disk (16).

4. The flange automatic centering welding device according to claim 3 is characterized in that: The support mold (17) has four split parts, each of which comprises a fan-shaped support part (174) and a matching end (171) connected thereto in the axial direction. The fan-shaped angles of the four fan-shaped support parts (174) are all 90°, and the four fan-shaped support parts (174) form a disc when the axial displacement is the smallest. The radial cross-section of the four matching ends (171) is a square when the axial displacement is the smallest. The four fan-shaped support parts (174) are all provided with inclined surfaces on one side close to the axis. The inclined surfaces of the four fan-shaped support parts (174) form a matching tapered hole (172), and the matching tapered hole (172) is inserted and matched with the outer shape of the cone (11).

5. The flange automatic centering welding device according to claim 4 is characterized in that: The mold base (12) has four split parts, each of which is a fan-shaped support part (123). The fan-shaped angles of the four fan-shaped support parts (123) are all 90 degrees, and a circular disk is formed when the radial displacement is the smallest. Straight surfaces are arranged on one side of the four fan-shaped support parts (123) close to the axis, and the straight surfaces of the four fan-shaped support parts (123) form matching straight holes (121) that are inserted and matched with four matching ends (171) of the supporting mold (17).

6. The flange automatic centering welding device according to claim 5, characterized in that: The centering mechanism also includes a connecting disk (18) and a connecting frame (14). The connecting disk (18) is detachably mounted on the sleeve disk (16). The sleeve disk (16) is fixedly mounted relative to the power unit through the connecting frame (14). The positioning pin (9) is mounted on the connecting disk (18). The positioning pin (9) is inserted into and matched with the pin hole on the flange for positioning. Each fan-shaped support portion (123) of the mold base (12) is also provided with a limiting hole (122) passing through in the axial direction. A fastener is installed through the limiting hole (122). One end of the fastener passes through the pressure plate (20) for fastening, and the other end is mounted on the connecting disk (18). When the fan-shaped support portion (123) moves back and forth in the radial direction, it is guided and limited by the fastener.

7. The flange automatic centering welding device according to claim 6, characterized in that: The hole groove of the limiting hole (122) is arranged in the radial direction and is opened on one side close to the outer circumferential surface of the fan-shaped support portion (123).

8. The flange automatic centering welding device according to claim 7, characterized in that: A mounting groove (173) is provided on one side of the fan-shaped support portion (174) where the end of the moving rod (15) is mounted. The mounting groove (173) is inserted into and matched with the end of the moving rod (15) and can be detachably mounted by means of screws.

9. The flange automatic centering welding device according to any one of claims 1 to 8, characterized in that: The displacement mechanism comprises a displacement cylinder (2), the fixed end of which is mounted on a base frame (1), the power end of which is connected to a displacement plate (13) vertically mounted on a base (4), the power part being a centering oil cylinder (10) mounted on the displacement plate (13), and a slider mounted at the bottom of the base (4), the slider being mounted in sliding cooperation with a guide rail (3) mounted on the base frame (1).

10. The flange automatic centering welding device according to claim 9, characterized in that: A mechanical arm (8) is also installed on the upper surface of the base (4), and the mechanical arm (8) is used to perform welding operations on steel pipes and flanges.

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