Thermal insulation pipe end welding device and operation method thereof

Abstract

The invention belongs to the technical field of thermal insulation pipe welding, and particularly relates to a thermal insulation pipe end welding device and an operation method thereof.The welding device comprises a welding gun and an outer supporting frame arranged on the ground, the outer supporting frame is used for supporting a pipeline, and the welding device further comprises a fixing rod and a set of inner supporting mechanisms arranged on the fixing rod; the two adjacent pipelines are placed on the outer supporting frame, the inner supporting mechanism sequentially penetrates into the two adjacent pipelines and is opened to be attached to the inner walls of the pipelines to be used for supporting the pipelines and centering the pipelines, the welding ends of the two adjacent pipelines are adjacent to the welding gun, centering and gap adjustment between the pipelines can be automatically achieved, manual participation is not needed, and the welding efficiency is improved. And the improvement of the welding quality between the pipelines is facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heat preservation pipe welding, and particularly relates to a heat preservation pipe end welding device and an operation method thereof. BACKGROUND

[0002] The heat preservation pipe pipeline is usually buried underground for liquid transportation. The diameter and weight of the heat preservation pipe pipeline are relatively large. During the transportation process, the heat preservation pipe pipeline needs to be hoisted by hoisting equipment and placed on the support in the pre-dug pit. The end of the adjacent pipeline is welded in the pit by the welding operator. In order to facilitate welding, it is necessary to ensure that the pit has a large depth and width. The difficulty and period of opening the pit are increased. On the other hand, the welding operation is carried out in the pit. The smoke generated during the welding process is difficult to quickly diffuse. Long-term inhalation in large quantities will damage the health of the operator. More importantly, the heat preservation pipe pipeline needs to be centered and the gap between the two pipeline ends to be welded is adjusted before welding. Due to the large weight of the pipeline, the outer protective layer and the heat preservation layer on the outer side of the pipeline may be slightly deformed under pressure during the placement process. In the traditional operation mode, manual participation is required to adjust the axis and gap between the two pipelines, and the experience and subjective judgment of the operator are used as the standard. Not only is the workload heavy, but there is also a large error in the gap or coaxiality, which affects the welding quality. SUMMARY

[0003] In order to solve the problems existing in the prior art, the present application provides a heat preservation pipe end welding device and an operation method thereof, which can automatically realize the centering and gap adjustment between the pipelines without manual participation, and helps to improve the welding quality between the pipelines.

[0004] The specific technical scheme adopted by the present application is as follows: A heat preservation pipe end welding device, comprising a welding gun and an outer support frame arranged on the ground, the outer support frame being used for supporting the pipeline, the welding device further comprising a fixed rod and a group of inner support mechanisms arranged on the fixed rod, the two adjacent pipelines being placed on the outer support frame respectively, the inner support mechanisms being sequentially inserted into the two adjacent pipelines and being opened to fit the inner wall of the pipeline for supporting the pipeline and centering the pipeline, and the welding ends of the two adjacent pipelines being arranged adjacent to the welding gun.

[0005] The inner support mechanism comprises a first connecting rod, a second connecting rod and a telescopic cylinder, the fixed end of the telescopic cylinder being mounted on the fixed rod, the axial direction of the telescopic cylinder being arranged in parallel with the axial direction of the fixed rod, the upper ends of the first connecting rod and the second connecting rod being hinged to each other and forming a support part fitting the inner wall of the pipeline, the lower ends of the first connecting rod and the second connecting rod being hinged to the telescopic end of the telescopic cylinder and the overhanging end of the fixed rod respectively, the support part having the freedom of lifting by means of the telescoping of the telescopic cylinder, and the first connecting rod and the second connecting rod being arranged in the circumferential direction of the fixed rod.

[0006] The upper end of the first connecting rod and the second connecting rod is respectively provided with an elastic sheet outwardly overhanging, and the elastic sheet is arranged in close contact with the inner wall of the pipeline.

[0007] The welding device further comprises a track and a moving trolley arranged on the track, the pipeline is arranged in axial parallel with the track, the fixing rod is fixedly connected with the moving trolley and has the freedom of moving along the track by means of the moving trolley, and the outer support frame is arranged above the track.

[0008] A limiting plate is arranged on the track, the limiting plate is arranged between the moving trolley and the pipeline, and the limiting plate is provided with an avoiding hole for the inner support mechanism.

[0009] The welding gun is arranged on a mechanical arm, the mechanical arm is arranged on the side of the track, and the end of the welding gun is driven to rotate around the pipeline to perform welding.

[0010] An operation method of the heat preservation pipe end welding device comprises the following steps: S1, the pipeline is hoisted and placed on the outer support frame by means of hoisting equipment, and the end of the pipeline is arranged in close contact with the limiting plate; S2, the moving trolley moves forward to the direction of the limiting plate, the inner support mechanism enters the pipeline, and the inner support mechanism is driven to expand and be arranged in close contact with the inner wall of the pipeline; S3, the moving trolley continues to move forward, the pipeline is pushed to the waiting station by the friction force between the inner support mechanism and the pipeline, the inner support mechanism is retracted, and the moving trolley retreats to the initial position; S4, another pipeline is hoisted and placed on the outer support frame by the hoisting equipment, and the end of the pipeline is arranged in close contact with the limiting plate; S5, the moving trolley moves forward to the direction of the limiting plate, the inner support mechanism enters the pipeline in the waiting station and expands to be arranged in close contact with the inner wall of the pipeline; S6, the moving trolley retreats, the pipeline in the waiting station approaches the other pipeline, the distance between the adjacent ends of the two pipelines reaches the welding requirement distance, the moving trolley stops moving, and the inner support mechanism in the other pipeline expands to be arranged in close contact with the inner wall of the pipeline; S7, the welding gun is moved by the mechanical arm, the end of the welding gun rotates around the adjacent ends of the two pipelines and performs circumferential welding; S8, the moving trolley continues to move forward, the pipeline arranged in close contact with the limiting plate is pushed to the waiting station by the friction force between the inner support mechanism and the pipeline, the inner support mechanism is retracted, the moving trolley retreats to the initial position, steps S4-S8 are repeated, and the welding operation is completed until the combined length of the pipelines reaches the preset length.

[0011] The present application has the following advantages: The inner support mechanism is attached to the inner wall of the pipeline metal material, the support and automatic centering of the pipeline are realized, the problem of large coaxiality error between the pipelines caused by the contact support of the pipeline by the outer protective layer of the outer support frame is avoided, and the adjustment of the coaxiality between the pipelines is not necessary when the welding operation is performed on the ground.

[0012] The inner support mechanism is installed on the moving trolley, the gap between the pipelines can be automatically adjusted by the movement of the moving trolley and the opening and closing of the inner support mechanism, manual intervention is not necessary, the gap between the pipelines meets the welding requirements, and the welding quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the present application; Figure 2 It is an A-A view of Figure 1 ; Figure 3 It is a structural schematic view of the inner support mechanism; In the drawings, 1 is a welding gun, 2 is an outer support frame, 3 is a pipeline, 4 is an inner support mechanism, 401 is a first connecting rod, 402 is a second connecting rod, 403 is a telescopic cylinder, 404 is a spring sheet, 5 is a track, 6 is a moving trolley, 7 is a limiting plate, 8 is a mechanical arm, and 9 is a fixed rod. DETAILED DESCRIPTION

[0014] The present application will be further described below in combination with the drawings and specific embodiments: The specific embodiments are as shown in the drawings, Figure 1 , Figure 2 The present application relates to a heat preservation pipe end welding device, which comprises a welding gun 1 and an outer support frame 2 arranged on the ground, the outer support frame 2 is used for supporting a pipeline 3, the welding device further comprises a fixed rod 9 and a group of inner support mechanisms 4 arranged on the fixed rod 9, two adjacent pipelines 3 are respectively placed on the outer support frame 2, the inner support mechanisms 4 are sequentially inserted into the two adjacent pipelines 3 and are attached to the inner walls of the pipelines 3 for supporting the pipelines 3 and centering the pipelines 3, the welding ends of the two adjacent pipelines 3 are arranged adjacent to the welding gun 1, and the outer sides of the pipelines 3 are supported by the outer support frame 2 and the inner walls of the two adjacent pipelines 3 are supported by the inner support mechanisms 4 during welding, manual intervention is not necessary for the centering process between the pipelines, the two pipelines 3 are coaxially arranged, and misalignment between the pipelines 3 is prevented.

[0015] As Figure 3As shown, the inner support mechanism 4 comprises a first connecting rod 401, a second connecting rod 402 and a telescopic cylinder 403, the fixed end of the telescopic cylinder 403 is installed on the fixed rod 9, the axial direction of the telescopic cylinder 403 is parallel to the axial direction of the fixed rod 9, the upper ends of the first connecting rod 401 and the second connecting rod 402 are hingedly connected to each other by means of a first hinge shaft and form a support part which is in contact with the inner wall of the pipeline 3, the lower end of the first connecting rod 401 is hingedly connected to the telescopic end of the telescopic cylinder 403 by means of a second hinge shaft, the lower end of the second connecting rod 402 is hingedly connected to the overhanging end of the fixed rod 9 by means of a third hinge shaft, the axial directions of the first hinge shaft, the second hinge shaft and the third hinge shaft are perpendicular to the axial direction of the fixed rod 9, the axial directions of the telescopic cylinder 403, the fixed rod 9 and the pipeline 3 are parallel, the support part has the freedom of lifting by means of the telescopic movement of the telescopic cylinder 403, and the first connecting rod 401 and the second connecting rod 402 are arranged in the circumferential direction of the fixed rod 9.

[0016] Before welding, the telescopic end of the telescopic cylinder 403 is elongated, the lower end of the first connecting rod 401 moves towards the second connecting rod 402, the support part of the inner support mechanism 4 moves along the radial direction of the pipeline synchronously, and the moving direction is away from the axis, that is, the inner support mechanism 4 is opened, the support part is in abutment with the metal inner wall of the pipeline 3, and the pipeline 3 is coaxial with the fixed rod 9, when the inner support mechanisms 4 corresponding to the two pipelines 3 are opened, the two pipelines 3 are coaxially arranged, the inner support mechanism 4 realizes the automatic coaxial arrangement of the two pipelines 3 to be welded, prevents the slight deformation of the protective layer and the heat preservation layer of the pipeline 3 caused by the support of the outer support frame 2, and improves the coaxiality between the pipelines 3.

[0017] Further, the upper ends of the first connecting rod 401 and the second connecting rod 402 are respectively provided with elastic pieces 404 which are arranged in an overhanging manner, the first connecting rod 401 and the second connecting rod 402 with the elastic pieces 404 have a scissor structure, when the support part is in abutment with the inner wall of the pipeline 3, the elastic pieces 404 are deformed and arranged in abutment with the inner wall of the pipeline 3, and the friction between the inner support mechanism 4 and the pipeline 3 is increased.

[0018] The welding device further comprises a track 5 and a moving trolley 6 arranged on the track 5, the axial directions of the pipeline 3 and the track 5 are parallel, the fixed rod 9 is fixedly connected to the moving trolley 6 and has the freedom of moving along the track 5 by means of the moving trolley 6, the outer support frame 2 is arranged above the track 5, the moving trolley 6 drives the fixed rod 9 and the inner support mechanism 4 on the fixed rod 9 to have the freedom of entering and exiting the pipeline 3, when the inner support mechanism 4 is opened, the moving trolley 6 moves along the track 5, the inner support mechanism 4 drives the pipeline 3 to move along with the moving trolley 6 by means of the friction, so as to realize the adjustment of the position of the pipeline 3.

[0019] The limiting plate 7 is arranged on the track 5 and located between the moving trolley 6 and the pipe 3. The limiting plate 7 is provided with a hole for avoiding the inner supporting mechanism 4. The limiting plate 7 is used for limiting the pipe 3 close to the moving trolley 6 among the two adjacent pipes 3, determining the position of the pipe 3, and adjusting the position of the pipe 3 driven away from the moving trolley 6, so as to realize that the gap between the two pipes 3 to be welded meets the welding requirement.

[0020] The limiting plate 7 is further provided with a hole for avoiding the moving trolley 6. The width of the moving trolley 6 is less than the diameter of the pipe 3. The left and right sides of the end of the pipe 3 abut against the limiting plate for limiting the pipe 3. When the two pipes 3 are welded, the inner supporting mechanism supports the end of the pipe 3 to be welded. At this time, the moving trolley 6 is arranged adjacent to the limiting plate 7.

[0021] The welding gun 1 is installed on the mechanical arm 8. The mechanical arm 8 is located on the side of the track 5. The end of the welding gun 1 is driven by the mechanical arm 8 to surround the pipe 3.

[0022] The operation method of the heat preservation pipe end welding device comprises the following steps: S1. The pipe 3 is hoisted and placed on the outer supporting frame 2 by means of hoisting equipment. The end of the pipe 3 is arranged in abutment with the limiting plate 7. At this time, the moving trolley 6 is located at the initial position, and the fixed rod 9 avoids the position where the pipe 3 is to be placed. The hoisting equipment is a hoist.

[0023] S2. The moving trolley 6 moves forward in the direction of the limiting plate 7, so that the inner supporting mechanism 4 enters the pipe 3 and drives the inner supporting mechanism 4 to abut against the inner wall of the pipe 3.

[0024] S3. The moving trolley 6 continues to move forward, and the pipe 3 is pushed to the waiting station by the friction force between the inner supporting mechanism 4 and the pipe 3, so as to reserve a space for placing the next pipe 3. The inner supporting mechanism 4 is retracted and separated from the pipe 3 on the waiting station. The moving trolley 6 retreats to the initial position.

[0025] S4. Another pipe 3 is hoisted and placed on the outer supporting frame 2 by the hoisting equipment. The end of the pipe 3 is arranged in abutment with the limiting plate 7. According to the moving distance of the moving trolley 6 in step S3, the distance between the pipe 3 and the pipe 3 on the waiting station can be determined.

[0026] S5. The moving trolley 6 moves forward in the direction. The inner supporting mechanism 4 passes through the pipe 3 hoisted in step S4 and enters the pipe 3 on the waiting station. The inner supporting mechanism 4 is opened and abuts against the inner wall of the pipe 3 on the waiting station for supporting.

[0027] S6, due to the friction between the inner support mechanism 4 and the pipeline 3 in the waiting station, the moving trolley 6 retreats, the pipeline 3 in the waiting station approaches another pipeline 3, the distance between the adjacent ends of the two pipelines 3 reaches the welding requirement distance, for example, 1-3mm, the moving trolley 6 stops moving, and the inner support mechanism 4 in the pipeline 3 abutting against the limiting plate 7 is opened and abuts against the inner wall of the pipeline 3, at this time, the two pipelines 3 are coaxially arranged.

[0028] S7, the mechanical arm 8 drives the welding gun 1 to move, the end of the welding gun 1 rotates around the adjacent ends of the two pipelines 3 and performs circumferential welding, and the two pipelines 3 are welded into one.

[0029] S8, after the welding is completed, the moving trolley 6 continues to move forward, and the pipeline 3 abutting against the limiting plate 7 is pushed to the waiting station by the friction between the inner support mechanism 4 and the pipeline 3, the inner support mechanism 4 is retracted, the moving trolley 6 retreats to the initial position, space is provided for hoisting and placing the next pipeline 3, steps S4-S8 are repeated, continuous welding operation is realized, until the combined length of the pipeline 3 reaches the preset length, the welding operation on the ground is completed.

[0030] The pipeline 3 completing the welding operation on the ground is hoisted and placed in the pit for laying and installation, which can effectively reduce the welding operation and operation time of the operator in the pit, and helps to improve the laying efficiency of the pipeline 3.

Claims

1. A welding device for the end of an insulated pipe, comprising a welding torch (1) and an external support frame (2) disposed on the ground, wherein the external support frame (2) is used to support the pipe (3), characterized in that: The welding device also includes a fixed rod (9) and a set of inner support mechanisms (4) set on the fixed rod (9). The two adjacent pipes (3) are respectively placed on the outer support frame (2). The inner support mechanism (4) is inserted into the two adjacent pipes (3) in sequence and opens to fit against the inner wall of the pipe (3) to support the pipe (3) and center the pipe (3). The welding ends of the two adjacent pipes (3) are set adjacent to the welding gun (1).

2. The insulated pipe end welding device according to claim 1, characterized in that: The internal support mechanism (4) includes a first connecting rod (401), a second connecting rod (402), and a telescopic cylinder (403). The fixed end of the telescopic cylinder (403) is installed on the fixed rod (9). The axial direction of the telescopic cylinder (403) is parallel to the axial direction of the fixed rod (9). The upper ends of the first connecting rod (401) and the second connecting rod (402) are hinged to each other to form a support part that fits against the inner wall of the pipe (3). The lower ends of the first connecting rod (401) and the second connecting rod (402) are respectively hinged to the telescopic end of the telescopic cylinder (403) and the cantilever end of the fixed rod (9). The support part has the freedom of lifting and lowering by means of the telescopic cylinder (403). The first connecting rod (401) and the second connecting rod (402) are both spaced apart around the circumference of the fixed rod (9).

3. The insulation pipe end welding device according to claim 2, characterized in that: The upper ends of the first connecting rod (401) and the second connecting rod (402) are respectively provided with spring pieces (404) extending outward, and the spring pieces (404) are fitted to the inner wall of the pipe (3).

4. The insulated pipe end welding device according to claim 1, characterized in that: The welding device also includes a track (5) and a moving trolley (6) set on the track (5). The pipe (3) is arranged parallel to the axis of the track (5). The fixed rod (9) is fixed to the moving trolley (6) and has the freedom to move along the track (5) by means of the moving trolley (6). The outer support frame (2) spans across the top of the track (5).

5. The insulated pipe end welding device according to claim 4, characterized in that: A limiting plate (7) is provided on the track (5). The limiting plate (7) is located between the moving trolley (6) and the pipe (3). The limiting plate (7) has a clearance hole for the inner support mechanism (4).

6. The insulation pipe end welding device according to claim 5, characterized in that: The welding torch (1) is mounted on the robotic arm (8), which is located on the side of the track (5). The welding torch (1) is driven by the robotic arm (8) to make the end of the welding torch (1) circle the pipe (3) for welding.

7. A method for operating the insulation pipe end welding device as described in claim 5, characterized in that, Includes the following steps: S1. Using hoisting equipment, the pipe (3) is hoisted and placed on the outer support frame (2), with the end of the pipe (3) fitting against the limiting plate (7); S2. The moving trolley (6) moves forward in the direction of the limiting plate (7) so that the inner support mechanism (4) enters the pipe (3) and drives the inner support mechanism (4) to open and fit against the inner wall of the pipe (3); S3. The mobile trolley (6) continues to move forward, using the friction between the inner support mechanism (4) and the pipe (3) to push the pipe (3) to the waiting position. The inner support mechanism (4) retracts, and the mobile trolley (6) returns to the initial position. S4. The hoisting equipment hoists another pipe (3) and places it on the outer support frame (2), with the end of the pipe (3) fitting against the limiting plate (7); S5. The moving trolley (6) moves forward in the direction of the limiting plate (7) so that the inner support mechanism (4) enters the pipe (3) waiting for the work station and opens to fit against the inner wall of the pipe (3); S6. The moving trolley (6) moves backward, so that the pipe (3) waiting for the work station moves closer to another pipe (3). When the distance between the adjacent ends of the two pipes (3) reaches the welding requirement distance, the moving trolley (6) stops moving. At the same time, the inner support mechanism (4) located in the other pipe (3) opens and fits against the inner wall of the pipe (3). S7. The robotic arm (8) drives the welding torch (1) to move. The end of the welding torch (1) rotates around the adjacent ends of the two pipes (3) and performs circumferential welding. S8. The moving trolley (6) continues to move forward, and the friction between the inner support mechanism (4) and the pipe (3) is used to push the pipe (3) that is in contact with the limiting plate (7) to the waiting position. The inner support mechanism (4) retracts, and the moving trolley (6) returns to the initial position. Repeat steps S4-S8 until the combined length of the pipe (3) reaches the preset length, and the welding operation is completed.

Images