Pipe fittings girth welding device

Abstract

The present invention discloses a pipe circumferential seam welding device, comprising a base, on which a power mechanism for driving the pipe to rotate is arranged; an inner ring positioning mechanism is arranged corresponding to the inner wall of the pipe, the inner ring positioning mechanism comprises a plurality of abutment rings arranged at intervals, and the abutment rings are radially moved by a diameter-changing driving mechanism; an elastic plate mechanism adapted to the diameter change is slidably arranged between adjacent abutment rings to adapt to the diameter change after the abutment ring moves; a welding gun positioning rod is rotatably arranged in the middle of the inner ring positioning mechanism, the welding gun positioning rod comprises a welding gun connecting rod, and a welding gun is radially connected; a support rod that can be kept vertically in contact with the wall of the pipe after the pipe changes its diameter is also connected to the welding gun positioning rod. The pipe circumferential seam welding device of the present invention is provided with an inner ring positioning mechanism that is adjustable and in contact with the inner wall of the hanger, and can effectively set the welding gun inside the pipe to ensure the welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline processing equipment, and in particular to a pipe fitting girth welding device. Background Art

[0002] Circumferential seam welding of pipe fittings is a common type of welding in welding technology. Circumferential seams are usually divided into inner and outer circumferential seams. Most of the circumferential seam welding machine systems on the market are currently used to weld outer circumferential seams, which are usually positioned in the inner cavity of the pipe fitting. However, for some pipe fittings, especially those with larger diameters, both the inside and outside need to be welded to ensure the strength after welding. At the same time, the inner circumferential seams of the pipes are mostly welded manually, and the welding quality cannot be guaranteed. For welding inside the pipe, the welding gun cannot be effectively fixed, and for special-shaped parts, such as elliptical pipe fittings, conventional equipment is not easy to position. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one object of the present invention is to provide a pipe circumferential seam welding device, which is provided with an inner ring positioning mechanism that can be adjusted and fits the inner wall of the hanger, and can effectively set the welding gun inside the pipe to ensure the welding quality.

[0004] The technical solution of the present invention is as follows:

[0005] A pipe circumferential seam welding device comprises a base, on which a power mechanism for driving the pipe to rotate is arranged; an inner ring positioning mechanism is arranged corresponding to the inner wall of the pipe, the inner ring positioning mechanism comprises a plurality of abutment rings arranged at intervals, and the abutment rings are radially moved by a diameter-changing driving mechanism; an elastic plate mechanism adapted to the diameter change is slidably arranged between adjacent abutment rings to adapt to the diameter change after the abutment ring moves; a welding gun positioning rod is rotatably arranged in the middle of the inner ring positioning mechanism, the welding gun positioning rod comprises a welding gun connecting rod, and is radially connected to the welding gun; the welding gun positioning rod is also connected to a support rod that can keep the pipe fitting vertically in contact with the wall surface after the pipe fitting changes its diameter.

[0006] Furthermore, the power mechanism includes a driving roller arranged on the base, and an outer fixing ring is correspondingly sleeved on the outer side of the pipe, and the driving roller frictionally drives the outer fixing ring to rotate.

[0007] Furthermore, a mounting groove is provided on the circumferential side of the outer fixing ring, and a radial fixing screw hole is provided in the mounting groove for radially threading the screw rod to clamp and fix the pipe fitting.

[0008] Furthermore, the outer fixing ring is also provided with an axial connecting screw hole penetrating the mounting groove for connecting the axial positioning screw rod, and the threads of the axial connecting screw hole on the pipe fitting to be welded are opposite so that the pipe fittings can be fitted and fixed facing each other.

[0009] Furthermore, the variable diameter driving mechanism includes an internal fixed column arranged at the axis center, a connecting column is fixed on the circumferential side of the internal fixed column corresponding to the abutment ring, a sliding groove extending outward is provided on the connecting column, a rack is slidably arranged in the sliding groove, the top of the rack is fixedly connected to the inner side surface of the abutment ring, and a driving gear meshing with the rack is installed on the connecting column, and the driving gear is driven by a motor installed on the connecting column.

[0010] Furthermore, an arc-shaped slideway is arranged inside the abutment ring, and the elastic plate mechanism is inserted and can slide adaptively in the slideway.

[0011] Furthermore, the elastic plate mechanism includes a fitting elastic plate and an extrusion elastic plate that are fitted together, the arc radius corresponding to the extrusion elastic plate is larger than the arc radius corresponding to the fitting elastic plate, and an extrusion medium is arranged between the two.

[0012] Furthermore, a mounting tube is fixed on the outer side of the extruded elastic plate, and a spring is arranged in the mounting tube to abut against the inner side of the elastic plate.

[0013] Furthermore, the top of the slideway is configured to reduce its diameter inward.

[0014] Furthermore, the welding gun positioning rod is connected to the end side of the inner fixed column through a bearing, and the welding gun connecting rod and the welding gun positioning rod are bifurcated.

[0015] Furthermore, electric push rods are installed on the welding gun connecting rod and the welding gun positioning rod along the rod axis, and the welding gun is connected to the electric push rod at the end of the welding gun connecting rod, and the end of the electric push rod at the end of the welding gun positioning rod is connected to a smooth support rod extending vertically downward.

[0016] The beneficial effects of the present invention are as follows: a radially movable abutment ring is provided, and an elastic plate mechanism is slidably provided between the abutment rings, which can adapt to special-shaped pipe fittings, such as elliptical pipe fittings. At the same time, the inner ring positioning mechanism is kept in contact with the inner wall of the pipe fitting to ensure the stability of welding. When the abutment ring is expanded and contracted and changes in diameter, the two elastic plates can be driven to deform; two groups of elastic plates with different bending amounts are provided, and the top curve of the slideway is bent toward the bottom curve, so that after the entire inner ring positioning mechanism is contracted and changed in diameter, the elastic plate can be bent and bulged better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the pipe girth welding device proposed by the present invention;

[0019] Figure 2 is a schematic diagram of the structure of the outer fixing ring;

[0020] Figure 3 is a schematic cross-sectional structural diagram of the inner ring positioning mechanism;

[0021] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0022] In the figure: 1-base; 11-driving roller; 2-external fixing ring; 21-installing groove; 22-axial connecting screw hole; 23-radial fixing screw hole; 3-inner ring positioning mechanism; 31-abutting ring; 311-slideway; 32-fitting elastic plate; 33-extrusion elastic plate; 34-installing cylinder; 35-spring; 36-inner fixing column; 4-welding gun positioning rod; 41-welding gun connecting rod; 42-support rod; 43-rotating column; 5-connecting column; 51-slideway; 52-rack; 53-driving gear. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Reference Figure 1 A pipe circumferential seam welding device comprises a base 1, on which the pipe to be processed is arranged after being butted, and an outer fixing ring 2 is sleeved on the outer side of the pipe for butting and fixing, and a driving roller 11 is arranged on the base 1 for frictionally driving the outer fixing ring 2 to rotate; an inner ring positioning mechanism 3 is arranged corresponding to the inner wall of the pipe, and the inner ring positioning mechanism 3 comprises a plurality of abutting rings 31 arranged at intervals, and the abutting rings 31 are driven to move radially by a diameter-changing driving mechanism; an elastic plate mechanism adapted to the diameter change is slidably arranged between adjacent abutting rings 31 to adapt to the diameter change after the abutting ring 31 moves, and can adapt to special-shaped pipes, such as elliptical pipes, and at the same time, the inner ring positioning mechanism 3 is kept in contact with the inner wall of the pipe to ensure the stability of welding;

[0026] In addition, a welding gun positioning rod 4 is relatively rotatably arranged in the middle of the inner ring positioning mechanism 3. The welding gun positioning rod 4 includes a welding gun connecting rod 41, which is radially connected to the welding gun; the welding gun positioning rod 4 is also connected to a support rod 42 that can remain vertical and fit the wall of the pipe after the pipe changes diameter.

[0027] Specifically,

[0028] like Figure 1 and Figure 2 A mounting groove 21 is provided on the circumferential side of the outer fixing ring 2, and a radial fixing screw hole 23 is provided in the mounting groove 21 for radially threading a screw to clamp and fix the pipe fitting; the outer fixing ring 2 also has an axial connecting screw hole 22 that passes through the mounting groove 21 for connecting an axial positioning screw, and the threads of the axial connecting screw hole 22 on the pipe fitting to be welded are opposite, so that the pipe fittings can be fitted and fixed facing each other.

[0029] like Figure 3 and Figure 4 The variable diameter driving mechanism includes an inner fixed column 36 arranged at the axis center, a connecting column 5 is fixed to the peripheral side of the inner fixed column 36 corresponding to the abutment ring 31, a slide groove 51 extending outward is provided on the connecting column 5, a rack 52 is slidably arranged in the slide groove 51, the top of the rack 52 is fixedly connected to the inner side surface of the abutment ring 31, and a driving gear 53 meshing with the rack 52 is installed on the connecting column 5, and the driving gear is driven by a motor installed on the connecting column 5 (the motor-related structure is omitted in the figure).

[0030] Further references Figure 1 , Figure 3 and Figure 4 , an arc-shaped slideway 311 is arranged inside the abutting ring 31, and the elastic plate mechanism is inserted and can slide adaptively in the slideway 311; in order to ensure that the elastic plate mechanism can better convexly deform, it includes a fitting elastic plate 32 and an extrusion elastic plate 33, the arc radius corresponding to the extrusion elastic plate 33 is larger than the arc radius corresponding to the fitting elastic plate 32, and an extrusion medium is arranged between the two, and its material can be selected as a high-elastic steel plate. In this embodiment, a mounting cylinder 34 is fixed on the outside of the extrusion elastic plate 33, and a spring 35 is arranged in the mounting cylinder 34 to abut against the inside of the fitting elastic plate 32, and when the abutting ring 31 is telescopic and changes diameter, the two elastic plates can be driven to deform. For example, to adapt to the elliptical pipe fitting, the abutting ring 31 in the vertical direction is adaptively adjusted to shrink, and the elastic plate is adaptively shrunk. Since the extrusion elastic plate 33 has a larger corresponding radius and a smaller deformation amount, it will squeeze the fitting elastic plate 32 to bend outward and fit the inner wall of the pipe fitting.

[0031] In addition, in order to facilitate the bending of the elastic plate, the top of the slide 311 is configured to change diameter inward, that is, the top curve of the slide 311 is bent toward the bottom curve (the curve radius of the top is smaller than the curve radius of the bottom), so that after the entire inner ring positioning mechanism 3 shrinks and changes diameter, the elastic plate can be bent and bulged better.

[0032] like Figure 1 and Figure 3The welding gun positioning rod 4 is connected to the end side of the inner fixed column 36 through a bearing, and the welding gun connecting rod 41 and the welding gun positioning rod 42 are forked. Electric push rods arranged along the axial direction of the rod are installed on the welding gun connecting rod 41 and the welding gun positioning rod 42, and a welding gun is connected to the electric push rod at the end of the welding gun connecting rod 41, and a smooth support rod extending vertically downward is connected to the end of the electric push rod at the end of the welding gun positioning rod 42. The extension distance of the welding gun and the support rod can be adjusted by adjusting the electric push rod. The support rod can be adaptively extended and retracted when the pipe rotates to ensure the stability of the welding position of the welding gun.

[0033] During welding, after the pipe is fixed, the position of the abutment ring 31 in the inner ring positioning mechanism 3 is radially adjusted to adapt to the size and shape of the inner wall of the pipe (slightly smaller than the inner cavity size of the pipe), and then the abutment ring 31 is further adjusted outward so that the whole is firmly fixed in the pipe at the position to be welded, which is convenient for subsequent welding.

[0034] In this application, structures and connection relationships that are not described in detail are all prior arts, and their structures and principles are well-known technologies and will not be described in detail here.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipe circumferential seam welding device, comprising a base, on which a power mechanism for driving the pipe to rotate is arranged; an inner ring positioning mechanism is arranged corresponding to the inner wall of the pipe, characterized in that: The inner ring positioning mechanism includes a plurality of abutment rings arranged at intervals, and the abutment rings are radially moved by a diameter-changing driving mechanism; an elastic plate mechanism adapted to the diameter change is slidably arranged between adjacent abutment rings to adapt to the diameter change after the abutment ring moves; a welding gun positioning rod is rotatably arranged in the middle of the inner ring positioning mechanism, and the welding gun positioning rod includes a welding gun connecting rod, and is radially connected to the welding gun; the welding gun positioning rod is also connected to a support rod that can keep the pipe fitting vertically and in contact with the wall surface after the pipe fitting changes its diameter; An arc-shaped slideway is arranged inside the abutment ring, and the elastic plate mechanism is inserted and can slide adaptively in the slideway; the elastic plate mechanism includes a fitting elastic plate and an extrusion elastic plate that are fitted together, the arc radius corresponding to the extrusion elastic plate is larger than the arc radius corresponding to the fitting elastic plate, and an extrusion medium is arranged between the two.

2. The pipe circumferential seam welding device according to claim 1, characterized in that: The power mechanism comprises a driving roller arranged on the base, and an outer fixing ring is sleeved correspondingly on the outer side of the pipe, and the driving roller frictionally drives the outer fixing ring to rotate.

3. The pipe circumferential seam welding device according to claim 2, characterized in that: A mounting groove is arranged on the circumferential side of the outer fixing ring, and a radial fixing screw hole is arranged in the mounting groove for radially threading a screw rod to clamp and fix the pipe fitting.

4. The pipe circumferential seam welding device according to claim 3, characterized in that: The outer fixing ring also has an axial connecting screw hole that passes through the installation groove for connecting the axial positioning screw. The threads of the axial connecting screw holes on the pipes to be welded are opposite so that the pipes can be fixed facing each other.

5. The pipe circumferential seam welding device according to claim 1, characterized in that: The variable diameter driving mechanism includes an inner fixed column arranged at the axis center, a connecting column is fixed on the circumferential side of the inner fixed column corresponding to the abutment ring, a sliding groove penetrating outward is provided on the connecting column, a rack is slidably arranged in the sliding groove, the top of the rack is fixedly connected to the inner side surface of the abutment ring, and a driving gear meshing with the rack is installed on the connecting column, and the driving gear is driven by a motor installed on the connecting column.

6. The pipe circumferential seam welding device according to claim 1, characterized in that: A mounting cylinder is fixed on the outer side of the extruded elastic plate, and a spring is arranged in the mounting cylinder to abut against and fit the inner side of the elastic plate.

7. The pipe circumferential seam welding device according to claim 1, characterized in that: The top of the slideway is set to reduce its diameter inward.

8. The pipe circumferential seam welding device according to any one of claims 5 to 7, characterized in that: The welding gun positioning rod is connected to the end side of the inner fixed column through a bearing, and the welding gun connecting rod and the welding gun positioning rod are forked; electric push rods arranged along the axial direction of the rod are installed on the welding gun connecting rod and the welding gun positioning rod, and the welding gun is connected to the electric push rod at the end of the welding gun connecting rod, and the end of the electric push rod at the end of the welding gun positioning rod is connected to a smooth support rod extending vertically downward.

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