Cold-drawn precision welded pipe production line
By using a heating frame design that combines motors and cylinders in the cold-drawn precision welded pipe production line, regional heat treatment of the welded pipe is achieved, solving the problems of cold-drawing stress elimination and material microstructure improvement, and enhancing the performance of the welded pipe.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-10
AI Technical Summary
Existing cold-drawn welded pipe production lines are inadequate in eliminating stress generated during the cold drawing process and improving the material microstructure.
A cold-drawn precision welded pipe production line is adopted. The heating frame is adjusted by a cylinder and the screw is rotated by a motor. The welded pipe is subjected to regional heat treatment by an electromagnetic heating coil inside the heating frame to eliminate stress and improve the material microstructure.
It effectively eliminates the stress generated during cold drawing, improves the material microstructure of welded pipes, and enhances the performance of welded pipes.
Smart Images
Figure CN223980988U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cold-drawn welded pipes, and in particular to a cold-drawn precision welded pipe production line. Background Technology
[0002] Cold-drawn welded pipe is a type of welded steel pipe (such as straight seam welded pipe) that has been further processed into steel pipe with more precise dimensions, smoother surface, and better mechanical properties through cold drawing process. The main steps of cold-drawn welded pipe are pretreatment, cold drawing, intermediate annealing, finishing and straightening, and post-treatment.
[0003] During processing on the production line, cold-drawn pipes require heat treatment to eliminate stress generated during the cold drawing process and improve the material's microstructure. Heat treatment generally includes two steps: annealing and normalizing. Annealing reduces the pipe's hardness and increases its plasticity, while normalizing improves its strength and hardness. Utility Model Content
[0004] In view of this, the present invention provides a cold-drawn precision welded pipe production line, the main technical problem to be solved is: to perform heat treatment on the cold-drawn welded pipe to eliminate the stress generated during the cold drawing process and improve the microstructure of the material.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cold-drawn precision welded pipe production line, comprising a cold drawing machine, a top frame fixedly connected to the top of the cold drawing machine, a movable cavity opened inside the top frame, a motor fixedly connected inside the top frame, a lead screw fixedly connected to the output end of the motor, a lead screw movably connected to the inner wall of the top frame at the end away from the motor, a movable frame movably connected to the outer surface of the lead screw, the motor, lead screw, and movable frame all located inside the movable cavity, a cylinder fixedly connected to the lower surface of the movable frame, and a heating frame installed at the bottom of the cylinder.
[0006] By adopting the above technical solution, the welded pipe is passed through the cold drawing machine during use. The cold drawing machine performs cold drawing operations on the welded pipe. The motor controls the rotation of the lead screw, which in turn controls the movement of the moving frame on the lead screw. The cylinder can adjust the height of the heating frame. The position of the heating frame can be adjusted by the cooperation of the moving frame and the cylinder, so that the heating frame can perform heat treatment on different areas of the cold-drawn welded pipe, thereby eliminating the stress generated during the cold drawing process and improving the microstructure of the material.
[0007] As a further description of the above technical solution:
[0008] The top frame has a track inside, and the side of the movable frame is fixedly connected to a protrusion, which is installed inside the track.
[0009] By adopting the above technical solution, the moving frame can move back and forth under the action of the screw through the internal track of the top frame, thereby adjusting the position of the heating frame.
[0010] As a further description of the above technical solution:
[0011] The heating frame has an inner cavity, and an electromagnetic heating coil is fixedly connected inside the inner cavity.
[0012] By adopting the above technical solution, the electromagnetic heating coil inside the heating frame can heat the welded pipe, eliminating the stress generated during the cold drawing process of the welded pipe.
[0013] As a further description of the above technical solution:
[0014] A connecting ring is fixedly connected to the top of the heating frame, a first through hole is opened at the bottom of the cylinder, and a second through hole is opened on the surface of the connecting ring. The positions of the first through hole and the second through hole are corresponding, and a connecting pin is installed inside the first through hole and the second through hole.
[0015] By adopting the above technical solution, the heating frame can be installed at the bottom of the cylinder and can be disassembled when not in use.
[0016] As a further description of the above technical solution:
[0017] The upper surface of the cold drawing machine is fixedly connected with two side plates, which are arranged opposite each other, and the surfaces of the two side plates are movably connected with rotating shafts.
[0018] By adopting the above technical solution, it is easy to support the welded pipe, keep the welded pipe in a horizontal state, and facilitate the cold drawing operation of the welded pipe.
[0019] As a further description of the above technical solution:
[0020] The end of the rotating shaft away from the side plate is fixedly connected to a support shaft, which has an hourglass-shaped structure.
[0021] By adopting the above technical solution, the welded pipe can be supported.
[0022] By means of the above technical solution, the cold-drawn precision welded pipe production line of this utility model has at least the following characteristics:
[0023] Beneficial effects:
[0024] 1. Compared with the existing technology, this cold-drawn precision welded pipe production line allows the welded pipe to pass through a cold-drawing machine during use. The cold-drawing machine performs cold drawing operations on the welded pipe. The operation of the motor controls the rotation of the lead screw, which in turn controls the movement of the moving frame on the lead screw. The operation of the cylinder can adjust the height of the heating frame. The position of the heating frame can be adjusted by the cooperation of the moving frame and the cylinder, so that the heating frame can perform heat treatment on different areas of the cold-drawn welded pipe, thereby eliminating the stress generated during the cold drawing process and improving the microstructure of the material.
[0025] 2. Compared with the existing technology, this cold-drawn precision welded pipe production line can heat the welded pipe through the electromagnetic heating coil inside the heating frame, eliminating the stress generated during the cold drawing process of the welded pipe. In addition, the heating frame can be installed at the bottom of the cylinder and can be disassembled when not in use. Attached Figure Description
[0026] Figure 1 This is a first-view overall structural schematic diagram of a cold-drawn precision welded pipe production line proposed in this utility model.
[0027] Figure 2 This is a second-view overall structural schematic diagram of a cold-drawn precision welded pipe production line proposed in this utility model.
[0028] Figure 3 This is a cross-sectional view of the internal structure of a cold-drawn precision welded pipe production line proposed in this utility model;
[0029] Figure 4 This utility model proposes a cold-drawn precision welded pipe production line. Figure 3 Enlarged view of the structure at point A in the middle.
[0030] Legend:
[0031] 1. Cold drawing machine; 2. Top frame; 3. Track; 4. Motor; 5. Lead screw; 6. Moving frame; 7. Cylinder; 8. Heating frame; 9. Inner cavity; 10. Electromagnetic heating coil; 11. Connecting ring; 12. Connecting pin; 13. Side plate; 14. Rotating shaft; 15. Support shaft. Detailed Implementation
[0032] Reference Figure 1-4This utility model provides a cold-drawn precision welded pipe production line, comprising a cold drawing machine 1, a top frame 2 fixedly connected to the top of the cold drawing machine 1, a movable cavity inside the top frame 2, a motor 4 fixedly connected inside the top frame 2, a lead screw 5 fixedly connected to the output end of the motor 4, the end of the lead screw 5 away from the motor 4 being movably connected to the inner wall of the top frame 2, and a movable frame 6 movably connected to the outer surface of the lead screw 5. The motor 4, lead screw 5, and movable frame 6 are all located inside the movable cavity. A track 3 is provided inside the top frame 2, and a protrusion is fixedly connected to the side of the movable frame 6, the protrusion being installed inside the track 3. The movable frame 6 can move along the lead screw 5 through the track 3 inside the top frame 2. The rod 5 moves back and forth under the action of the rod, thereby adjusting the position of the heating frame 8. The lower surface of the moving frame 6 is fixedly connected to the cylinder 7, and the heating frame 8 is installed at the bottom of the cylinder 7. When in use, the welded pipe is passed through the cold drawing machine 1, and the cold drawing machine 1 performs cold drawing operations on the welded pipe. The operation of the motor 4 controls the rotation of the lead screw 5, which in turn controls the movement of the moving frame 6 on the lead screw 5. The operation of the cylinder 7 can adjust the height of the heating frame 8. The position of the heating frame 8 can be adjusted by the cooperation of the moving frame 6 and the cylinder 7, so that the heating frame 8 can perform heat treatment on different areas of the cold-drawn welded pipe, thereby eliminating the stress generated during the cold drawing process and improving the microstructure of the material.
[0033] The heating frame 8 has an inner cavity 9, and an electromagnetic heating coil 10 is fixedly connected inside the inner cavity 9. The electromagnetic heating coil 10 inside the heating frame 8 can heat the welded pipe and eliminate the stress generated during the cold drawing process of the welded pipe.
[0034] A connecting ring 11 is fixedly connected to the top of the heating frame 8. A first through hole is opened at the bottom of the cylinder 7. The first through hole is located at the bottom of the cylinder 7 and does not penetrate the ventilation area of the cylinder 7, so it will not affect the cylinder 7. A second through hole is opened on the surface of the connecting ring 11. The positions of the first through hole and the second through hole are corresponding. A connecting pin 12 is installed inside the first through hole and the second through hole, so that the heating frame 8 can be installed at the bottom of the cylinder 7 and can be disassembled when not in use.
[0035] The upper surface of the cold drawing machine 1 is fixedly connected with two side plates 13, which are arranged opposite to each other. The surfaces of the two side plates 13 are movably connected with rotating shafts 14. The end of the rotating shaft 14 away from the side plate 13 is fixedly connected with a support shaft 15. The support shaft 15 has an hourglass-shaped structure and plays a supporting role for the welded pipe.
[0036] Working principle: When in use, the welded pipe is passed through the cold drawing machine 1, and the cold drawing machine 1 performs cold drawing on the welded pipe. The motor 4 controls the rotation of the lead screw 5, which in turn controls the movement of the moving frame 6 on the lead screw 5. The cylinder 7 can adjust the height of the heating frame 8. The position of the heating frame 8 can be adjusted by the movement frame 6 and the cylinder 7, so that the heating frame 8 can perform heat treatment on different areas of the cold-drawn welded pipe, thereby eliminating the stress generated during the cold drawing process and improving the microstructure of the material.
[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A cold-drawing precision welded pipe production line comprising a cold-drawing machine (1), characterized in that: The top of the cold drawing machine (1) is fixedly connected with a top frame (2), the inside of the top frame (2) is provided with a moving cavity, the inside of the top frame (2) is fixedly connected with a motor (4), the output end of the motor (4) is fixedly connected with a lead screw (5), the end, away from the motor (4), of the lead screw (5) is movably connected with the inner wall of the top frame (2), the outer surface of the lead screw (5) is movably connected with a moving frame (6), the motor (4), the lead screw (5) and the moving frame (6) are all located inside the moving cavity, the lower surface of the moving frame (6) is fixedly connected with an air cylinder (7), and the bottom of the air cylinder (7) is provided with a heating frame (8).
2. A precision pipe-in-tube production line as claimed in claim 1, characterized in that: The inside of the top frame (2) is provided with a track (3), the side of the moving frame (6) is fixedly connected with a protruding block, and the protruding block is installed inside the track (3).
3. A precision pipe-in-tube production line as claimed in claim 1, characterized in that: The inside of the heating frame (8) is provided with an inner cavity (9), and the inside of the inner cavity (9) is fixedly connected with an electromagnetic heating coil (10).
4. A precision pipe-in-tube production line as claimed in claim 1, characterized in that: The top of the heating frame (8) is fixedly connected with a connecting ring (11), the bottom of the air cylinder (7) is provided with a first through hole, the surface of the connecting ring (11) is provided with a second through hole, the positions of the first through hole and the second through hole correspond to each other, and the inside of the first through hole and the second through hole is installed with a connecting pin (12).
5. A precision pipe-in-tube production line as claimed in claim 1, characterized in that: The upper surface of the cold drawing machine (1) is fixedly connected with side plates (13), the number of the side plates (13) is two, the two side plates (13) are oppositely arranged, and the surfaces of the two side plates (13) are movably connected with rotating shafts (14).
6. A precision pipe mill as claimed in claim 5, wherein: The end, away from the side plate (13), of the rotating shaft (14) is fixedly connected with a supporting shaft (15), and the supporting shaft (15) is in the shape of a sandglass.