Automatic pipe head sealing and welding equipment

Abstract

The utility model discloses an automatic pipe head seal welding device which is used for conducting seal welding on the two ends of a composite pipe, and the composite pipe comprises a base pipe and a composite layer pipe. The automatic pipe head sealing and welding equipment comprises a base station, operation frames located on the base station and an expansion mechanism connected to the operation frames, and the operation frames are located at the two longitudinal ends of the composite pipe. The expansion mechanism comprises a frame connected to the operation frame, a hydraulic cylinder located in the frame, a conical expansion head driven by the hydraulic cylinder, a positioning disc fixed to the front end of the frame and an inner supporting module located on the inner circumference of the positioning disc. The inner supporting module is provided with a main body part and an expansion part forwards protruding out of the positioning disc from the main body part. When the composite pipe is expanded, the positioning disc abuts against the end face of the base pipe, the expansion part protrudes into the inner circumference of the composite pipe, and the hydraulic cylinder drives the conical expansion head to move forwards to abut against the inner wall face of the main body part, so that the expansion part moves in the radial direction to enable the composite pipe to be tightly attached to the base pipe in an expanded mode. Therefore, the gap between the base pipe and the multi-layer pipe is eliminated, and a good welding state is provided for automatic welding.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic pipe head sealing and welding equipment, in particular to an automatic pipe head sealing and welding equipment for mechanical composite pipes. Background Art

[0002] Bimetallic composite pipes are composed of two layers of different metals, one inside and one outside. They offer the following characteristics: the inner layer is highly corrosion-resistant, resisting erosion by corrosive media such as hydrogen sulfide, acids, and alkalis; the outer layer possesses sufficient strength and toughness to withstand pressure and other environmental conditions. Bimetallic mechanical composite pipes are a type of composite pipe with advantages such as rapid production and low cost. Therefore, they are widely used in a wide range of industrial fields, including water conservancy, hydropower engineering, petrochemical engineering, gas engineering, fire protection engineering, schools and hospitals, and industrial and civil construction projects. Their application is becoming increasingly broad, bringing with it increasingly significant economic, environmental, and social benefits.

[0003] However, to facilitate threading of 12.5-meter-long mechanical composite pipes, the gap between the inner wall of the base pipe and the outer wall of the composite pipe is generally over 6mm. After threading, the gap is uneven and large, making it difficult to weld automatically. Furthermore, the composite pipe requires welding at both ends of the pipe head, and the pipe is relatively long, which can lead to height and left-right weld position fluctuations during the rotary welding process. Conventional practice is for welders to use auxiliary tools to roughly adjust the gap between the inner and outer pipes to a uniform level. They then perform spot welding, manually add wire, and perform manual TIG welding. Once one end is welded, the welder repeats the process at the other end to seal the pipe. This method requires highly skilled workers and is labor-intensive. It is difficult to guarantee welding quality and results in low production efficiency.

[0004] Therefore, it is desirable to propose a new automatic pipe head sealing and welding device to overcome the above-mentioned defects. Utility Model Content

[0005] The purpose of the utility model is to provide an automatic pipe head sealing and welding device for mechanical composite pipes, which has an automatic pipe expansion function, eliminates gaps between pipes, and provides a good welding state for automatic welding.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an automatic pipe head sealing and welding device for sealing and welding the two ends of a composite pipe, wherein the composite pipe includes a longitudinal base pipe and a composite pipe inserted into the base pipe; the automatic pipe head sealing and welding device includes a base, a support frame and an operating frame located on the base, and a tightening mechanism connected to the operating frame, wherein the support frame is used to support the outer wall of the base pipe, the operating frame is located at the longitudinal ends of the composite pipe and adjusts the alignment of the tightening mechanism with the composite pipe. The tightening mechanism includes a frame connected to the operating frame, a hydraulic cylinder located in the frame, a conical expansion head driven by the hydraulic cylinder, a positioning plate fixed to the longitudinal front end of the frame, and an internal support module located on the inner periphery of the positioning plate, wherein the internal support module is provided with a main body for the conical expansion head to push against and an expansion portion protruding longitudinally forward from the main body to the positioning plate. When the composite pipe is expanded, the positioning plate abuts against the longitudinal end surface of the base pipe, and the front end of the expansion part protrudes into the inner circumference of the composite pipe. The hydraulic cylinder drives the conical expansion head to move forward in the longitudinal direction to push against the inner wall surface of the main body, thereby causing the expansion part to move radially to expand the composite pipe and fit it to the base pipe.

[0007] In a preferred embodiment, the positioning plate is provided with a positioning end face abutting against the longitudinal end face of the base pipe and a positioning groove longitudinally penetrating the positioning end face, and the internal support module is provided with a guide portion protruding longitudinally from the main body, and the guide portion is accommodated in the positioning groove so that the internal support module moves radially relative to the positioning plate.

[0008] In a preferred embodiment, the inner support module has 6 mold blocks evenly distributed along the circumference, and the maximum single-side internal expansion stroke of the inner support module is 10 mm.

[0009] In a preferred embodiment, each of the mold blocks has the expansion portion, and the maximum length of the expansion portion protruding into the composite tube is 35 mm.

[0010] In a preferred embodiment, the cone slope of the conical expanding head is 3°, and the maximum internal expansion force of the conical expanding head is 950 tons.

[0011] In a preferred embodiment, the frame is provided with a rear plate, a middle plate and a front plate arranged in sequence along the longitudinal direction, and a side plate connected to one side of the rear plate, the middle plate and the front plate, and the side plate is connected to the operating frame; the hydraulic cylinder is located between the rear plate and the middle plate, the conical expansion head is located between the middle plate and the front plate, and the positioning plate is fixed to the longitudinal front end surface of the front plate.

[0012] In a preferred embodiment, the frame is further provided with a plurality of first reinforcing rods connected between the rear plate and the middle plate and a plurality of second reinforcing rods connected between the middle plate and the front plate, a plurality of the first reinforcing rods being arranged around the outer circumference of the hydraulic cylinder, and a plurality of the second reinforcing rods being arranged around the outer circumference of the conical expansion head.

[0013] In a preferred embodiment, the automatic pipe head sealing device includes a welding system arranged on the operating frame. After the composite pipe is expanded, the welding system performs sealing welding on both ends of the base pipe and the clad pipe.

[0014] In a preferred embodiment, the automatic pipe head sealing equipment includes a laser tracking system arranged on the operating frame, and the laser tracking system has laser weld positioning and automatic tracking functions to perform weld positioning before welding and position tracking during welding, thereby realizing automatic pipe head sealing of the composite pipe.

[0015] In a preferred embodiment, the support frame is a supporting rotating roller frame. When the composite pipe is welded, the support frame moves to drive the composite pipe to rotate, so as to achieve circumferential welding of the composite pipe.

[0016] Compared with the prior art, the present invention has the following advantages: the expansion mechanism includes a frame connected to an operating frame, a hydraulic cylinder located within the frame, a conical expansion head driven by the hydraulic cylinder, a positioning plate fixed to the longitudinal front end of the frame, and an internal support module located on the inner periphery of the positioning plate. The internal support module includes a main body for the conical expansion head to push against, and an expansion portion that protrudes longitudinally forward from the main body to form the positioning plate. When the composite pipe is expanded, the positioning plate abuts against the longitudinal end face of the base pipe, and the front end of the expansion portion protrudes into the inner periphery of the composite pipe. The hydraulic cylinder drives the conical expansion head to move longitudinally forward to push against the inner wall of the main body, thereby causing the expansion portion to move radially and expand the composite pipe to fit tightly against the base pipe. The expansion mechanism has an automatic pipe expansion function, thereby eliminating the gap between the base pipe and the composite pipe, providing a good welding state for automatic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the automatic pipe head sealing and welding equipment in a preferred embodiment of the present utility model.

[0018] Figure 2 yes Figure 1 The figure shows a three-dimensional schematic diagram of part of the structure of the automatic tube head sealing equipment.

[0019] Figure 3 yes Figure 2 The three-dimensional schematic diagram of the expansion mechanism in the automatic tube head sealing equipment shown.

[0020] Figure 4 yes Figure 3 The front view of the tensioning mechanism is shown.

[0021] Figure 5 yes Figure 3 A cross-sectional view of the expansion mechanism shown. DETAILED DESCRIPTION

[0022] See also Figures 1 to 5 As shown, a preferred embodiment of the present invention discloses an automatic pipe head sealing device 100, which is used to perform sealing welding operations on both ends of the composite pipe 200; it is mainly for the composite pipe 200 to be sealed and welded at both ends after the pipe is passed through, in order to ensure the quality of mechanical composite. For this application, the welding quality and welding efficiency are improved, and one person can operate and weld both ends at the same time, which greatly reduces manual skills and improves production efficiency, and is of great significance for promotion in this industry. In this embodiment, the composite pipe 200 is a mechanical composite pipe and includes a longitudinal base pipe 201 and a composite pipe 202 inserted into the base pipe 201; the gap between the base pipe 201 and the composite pipe 202 is approximately 6mm.

[0023] See also Figure 1 As shown, the automatic pipe head sealing and welding equipment 100 comprises a horizontally mounted base 101, a support frame 102 and an operating frame 103 located on the base 101, an expansion mechanism 104 connected to the operating frame 103, and a welding system and laser tracking system mounted on the operating frame 103. The support frame 101 supports the outer wall of the base pipe 201. The operating frames 102 are located at both longitudinal ends of the composite pipe 200 and align the expansion mechanism 104 with the composite pipe 200. The expansion mechanism 104 expands and secures the composite pipe 202 to the base pipe 201. After the composite pipe 200 is expanded, the welding system seals the ends of the base pipe 201 and the composite pipe 202.

[0024] The laser tracking system has laser weld seam positioning and automatic tracking functions, enabling weld seam positioning before welding and position tracking during welding, thereby achieving automatic pipe end sealing of the composite pipe 200. Specifically, to achieve dual-gun automatic circumferential seam welding, the laser tracking system is equipped with a laser vision sensor to perform weld seam positioning before welding and position tracking during welding. In other words, the laser uses a laser to capture the characteristic points of the circumferential seam weld position, memorize the weld seam's X- and Z-axis position coordinates, and memorize the exact position of each point in the circumferential seam. Through background data processing, this data is fed back to the actuator, which adjusts the welding gun in the X and Z directions to ensure that the welding gun is always aligned with the weld seam position, achieving ideal weld penetration and weld formation.

[0025] Combine Figure 2As shown, the support frame 102 is a supporting rotating roller frame. When the composite pipe 200 is welded, the support frame 102 moves to drive the composite pipe 200 to rotate, so as to realize circumferential welding of the composite pipe 200, further reducing the labor intensity and work skills of the operator, improving the consistency of welding quality, and improving the level and capacity of automation for the manufacture of mechanical composite pipe 200.

[0026] See also Figures 3 to 5 As shown, the expansion mechanism 104 includes a frame 10 connected to the operating frame 102, a hydraulic cylinder 20 located in the frame 10, a conical expansion head 30 driven by the hydraulic cylinder 20, a positioning plate 40 fixed to the longitudinal front end of the frame 10, and an inner support module 50 located on the inner periphery of the positioning plate 40. The positioning plate 40 is located at the longitudinal front end of the conical expansion head 30 and is sleeved on the outer periphery of the inner support module 50.

[0027] The frame 10 comprises a rear plate 11, a middle plate 12, and a front plate 13 arranged longitudinally, and a side plate 14 connected to one side of the rear plate 11, middle plate 12, and front plate 13. The hydraulic cylinder 20 is located between the rear plate 11 and middle plate 12, the conical expansion head 30 is located between the middle plate 12 and front plate 13, and the positioning plate 40 is fixed to the longitudinal front end surface of the front plate 13. The side plate 14 is movably connected to the operating frame 103, allowing the operating frame 103 to control the adjustment of the expansion mechanism 104 relative to the composite pipe 200 for calibration and alignment.

[0028] The frame 10 is further provided with a plurality of first reinforcing rods 15 connected between the rear plate 11 and the middle plate 12 and a plurality of second reinforcing rods 16 connected between the middle plate 12 and the front plate 13. The plurality of first reinforcing rods 15 are arranged around the outer circumference of the hydraulic cylinder 20, and the plurality of second reinforcing rods 16 are arranged around the outer circumference of the conical expansion head 30, thereby strengthening the overall strength of the frame 10.

[0029] In this embodiment, the hydraulic cylinder 20 has a 200mm bore and a maximum stroke of 200mm. The tapered expansion head 30 is made of quenched high-strength steel and has a 3° taper. The hydraulic cylinder 20 has a thrust of 50 tons, and the tapered expansion head 30 has a force multiplication factor of 19, meaning the maximum internal expansion force of the tapered expansion head 30 is 950 tons.

[0030] The positioning plate 40 is provided with a positioning end surface 41 that abuts against the longitudinal end surface of the base tube 201, and a plurality of positioning grooves 42 extending longitudinally through the positioning end surface 41, with the plurality of positioning grooves 42 evenly distributed along the circumference. The internal support module 50 is provided with a main body 51 for the tapered expansion head 30 to push against, a tightening portion 52 that protrudes longitudinally forward from the main body 51 to extend the positioning plate 40, and a guide portion 53 that protrudes longitudinally from the main body 51. The guide portion 53 is received in the positioning groove 42, allowing the internal support module 50 to move radially relative to the positioning plate 40.

[0031] Specifically, the internal support module 50 comprises six mold blocks 501 evenly distributed along the circumference. The maximum single-side expansion stroke of the internal support module 50 is 10 mm, and the maximum internal expansion force is 400 tons. Furthermore, each mold block 501 is made of quenched high-strength steel and includes the aforementioned expansion portion 52. The maximum length of the expansion portion 52 protruding into the composite tube 200 is 35 mm. In other embodiments, the mold blocks 501 can be customized to suit the inner diameter of the composite tube 200, and internal support modules 50 of different specifications can be replaced using screws.

[0032] When the composite tube 200 is expanded, the positioning plate 40 abuts against the longitudinal end surface of the base tube 201 to position the base tube 201, and the front end of the expansion portion 52 protrudes into the inner circumference of the clad tube 202. At this time, the hydraulic cylinder 20 drives the conical expansion head 30 to move forward longitudinally to push against the inner wall of the main body 51, thereby causing the expansion portion 52 to move radially, expanding and tightening the clad tube 202 to the base tube 201. In this embodiment, the expansion mechanism 104 has an automatic tube expansion function, thereby eliminating the gap between the base tube 201 and the clad tube 202, providing a good welding state for automatic welding.

[0033] In the present utility model, the tightening mechanism 104 includes a frame 10 connected to the operating frame 103, a hydraulic cylinder 20 located in the frame 10, a conical expansion head 30 driven by the hydraulic cylinder 20, a positioning plate 40 fixed to the longitudinal front end of the frame 10, and an internal support module 50 located on the inner periphery of the positioning plate 40. The internal support module 50 is provided with a main body 51 for the conical expansion head 30 to push against and an expansion portion 52 protruding forward from the main body 51 along the longitudinal direction of the positioning plate 40. When the composite pipe 200 is expanded, the positioning plate 40 abuts against the longitudinal end face of the base pipe 201, and the front end of the expansion portion 52 protrudes into the inner circumference of the composite pipe 202. The hydraulic cylinder 20 drives the conical expansion head 30 to move forward longitudinally to push against the inner wall of the main body 51, thereby causing the expansion portion 52 to move radially, expanding and tightening the composite pipe 202 to the base pipe 201. The expansion mechanism 104 has an automatic expansion function, eliminating the gap between the base pipe 201 and the composite pipe 202, providing an optimal welding state for automatic welding. Simultaneously, the laser vision sensor of the laser tracking system enables weld starting point location and process tracking, effectively solving the weld tracking problem during the girth welding of long pipe heads and further improving the level of automation. This further reduces the labor intensity and work skills of operators, improves the consistency of welding quality, and enhances the level and capability of automation in the manufacture of mechanical composite pipes.

[0034] In summary, the above are merely preferred embodiments of the present invention and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention should still fall within the scope of the present invention patent.

Claims

1. An automatic pipe head sealing welding device for sealing and welding both ends of a composite pipe, wherein the composite pipe comprises a longitudinal base pipe and a cladding pipe inserted into the base pipe; the automatic pipe head sealing welding device comprises a base, a support frame and an operating frame located on the base, and an expansion mechanism connected to the operating frame, wherein the support frame is used to support the outer wall of the base pipe, and the operating frame is located at both longitudinal ends of the composite pipe and adjusts the expansion mechanism to align with the composite pipe; the characteristics are: The expansion mechanism includes a frame connected to the operating frame, a hydraulic cylinder located in the frame, a conical expansion head driven by the hydraulic cylinder, a positioning plate fixed to the longitudinal front end of the frame and an internal support module located on the inner circumference of the positioning plate, the internal support module is provided with a main body for the conical expansion head to push and an expansion part protruding forward from the main body along the longitudinal direction to describe the positioning plate; when the composite pipe is expanded, the positioning plate abuts against the longitudinal end face of the base pipe, and the front end of the expansion part protrudes into the inner circumference of the composite pipe, and the hydraulic cylinder drives the conical expansion head to move forward in the longitudinal direction to push the inner wall surface of the main body, thereby causing the expansion part to move radially to expand the composite pipe and fit it to the base pipe.

2. The automatic pipe head sealing equipment according to claim 1, characterized in that: The positioning plate is provided with a positioning end face that abuts against the longitudinal end face of the base pipe and a positioning groove that passes through the positioning end face in the longitudinal direction. The internal support module is provided with a guide portion that protrudes longitudinally from the main body. The guide portion is accommodated in the positioning groove so that the internal support module moves radially relative to the positioning plate.

3. The automatic pipe head sealing device according to claim 2, characterized in that: The inner support module has 6 mold blocks evenly distributed along the circumference, and the maximum single-side internal expansion stroke of the inner support module is 10 mm.

4. The automatic pipe head sealing device according to claim 3, characterized in that: Each mold block has the expansion portion, and the maximum length of the expansion portion protruding into the composite tube is 35 mm.

5. The automatic pipe head sealing device according to claim 1, characterized in that: The cone inclination of the conical expanding head is 3°, and the maximum internal expansion force of the conical expanding head is 950 tons.

6. The automatic pipe head sealing device according to claim 1, characterized in that: The frame is provided with a rear plate, a middle plate and a front plate arranged in sequence along the longitudinal direction, and a side plate connected to one side of the rear plate, the middle plate and the front plate, and the side plate is connected to the operating frame; the hydraulic cylinder is located between the rear plate and the middle plate, the conical expansion head is located between the middle plate and the front plate, and the positioning plate is fixed to the longitudinal front end surface of the front plate.

7. The automatic pipe head sealing device according to claim 6, characterized in that: The frame is further provided with a plurality of first reinforcing rods connected between the rear plate and the middle plate and a plurality of second reinforcing rods connected between the middle plate and the front plate. The plurality of first reinforcing rods are arranged around the outer circumference of the hydraulic cylinder, and the plurality of second reinforcing rods are arranged around the outer circumference of the conical expansion head.

8. The automatic pipe head sealing device according to claim 1, characterized in that: The automatic pipe head sealing welding equipment includes a welding system arranged on the operating frame. After the composite pipe is expanded, the welding system performs sealing welding on both ends of the base pipe and the clad pipe.

9. The automatic pipe head sealing device according to claim 8, characterized in that: The automatic pipe head sealing welding equipment includes a laser tracking system arranged on the operating frame. The laser tracking system has laser weld positioning and automatic tracking functions to perform weld positioning before welding and position tracking during welding, thereby realizing automatic pipe head sealing welding of the composite pipe.

10. The automatic pipe head sealing device according to claim 9, characterized in that: The support frame is a supporting rotating roller frame. When the composite pipe is welded, the support frame moves to drive the composite pipe to rotate, so as to achieve circumferential welding of the composite pipe.

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