Port expanding forming device for longitudinal welded pipe

Abstract

The invention discloses a straight welded pipe port expanding forming device. The device comprises a piston cylinder and a limiting barrel, and the piston cylinder is coaxially connected to the rear end of the limiting barrel through a supporting frame; the piston cylinder comprises a front cylinder body and a rear cylinder body which are coaxially connected in sequence; the to-be-expanded part of the longitudinal welded pipe is arranged on the periphery of the expanding module in a sleeving mode, the rear cylinder body works to drive the expanding cone to extrude the expanding module outwards and extrude the pipe to achieve expanding, and the front cylinder body works to drive the extruding cone to extrude the sealing groove module outwards to extrude a sealing groove in the inner wall of the pipe. According to the invention, the port of the straight welded pipe is expanded and the sealing groove is pressed to be integrally processed and formed, and the port of one end of the steel pipe is expanded, so that the head and the tail of each steel pipe can be tightly connected with other steel pipes, the connection in a construction site is facilitated, the installation process is simplified, the installation efficiency and the installation quality are improved, and the device has practical significance for the production of large-diameter pipeline steel pipes.

Description

Technical Field

[0001] The invention relates to the technical field of material forming, in particular to a straight seam welded pipe port diameter expansion forming device. Background Art

[0002] In recent years, steel pipes have gradually developed in the direction of high strength and high toughness. The market's requirements for steel pipe quality have been continuously improved, and pipe manufacturing technology and equipment have been continuously innovated and improved. At present, welding is mostly used to connect steel pipes at construction sites. Workers need to find pipes with similar pipe end diameters from a large pile of pipes and hang them together for welding. The progress of the project is very slow and the labor intensity of workers is also very high. At present, there are two main types of expanders: hydraulic and mechanical. For the expansion of large-diameter steel pipe ends, hydraulic expanders have problems such as difficulty in adjusting the specifications of the mold cone head, a large number of molds, and very expensive costs. At present, there is no expansion equipment that integrates expansion and forming sealing grooves. Generally, after the pipe blank is expanded, the sealing groove is additionally processed at the end of the pipe.

[0003] Therefore, the existing material forming field needs to be further improved. Summary of the invention

[0004] The present invention provides a straight seam welded pipe port expansion and forming device, the purpose of which is to solve the technical problems of high pipeline manufacturing process, large market demand and difficult on-site construction. The pipe port is expanded and a sealing groove is pressed out, so that the head and tail ends of each steel pipe can be tightly connected, which is convenient for connecting pipes on the construction site, simplifies the installation process, and improves the installation efficiency and quality.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] A straight seam welded pipe port expansion and forming device, comprising a piston cylinder and a limiting cylinder, wherein the piston cylinder is coaxially connected to the rear end of the limiting cylinder through a support frame; the piston cylinder comprises a front cylinder body and a rear cylinder body coaxially connected in sequence;

[0007] An expansion piston is arranged in the rear cylinder body, the expansion piston is fixed to one end of the expansion piston rod, an expansion cone is fixed to the other end of the expansion piston rod, a plurality of expansion modules are slidably arranged on the outside of the expansion cone along the circumferential direction, an extrusion cone is slidably arranged at the front end of the expansion cone, a plurality of sealing groove modules are arranged on the outside of the extrusion cone, and the sealing groove modules are installed on the front surface of the expansion module; the expansion piston rod is located on the central axis of the piston cylinder;

[0008] The extrusion cone is fixed at one end of the extrusion piston rod, and an extrusion piston is provided at the other end of the extrusion piston rod. The extrusion piston is slidably connected between the expansion piston rod and the inner wall of the front cylinder body. A guide plate is fixedly installed on the front side of the support frame and located in the limiting cylinder. The expansion module is slidably connected to the guide groove distributed radially on the guide plate; the extrusion piston rod is arranged in parallel with the expansion piston rod.

[0009] Furthermore, the expansion cone is a combination structure of a circular tube and a regular polygonal cone, the regular polygonal cone is coaxially installed at the rear end of the circular tube, the outer surface of the regular polygonal cone is consistent with the inclination angle of the bottom surface of the expansion module, and one end of the expansion piston rod passes through the central axis of the expansion cone and is connected to the front end of the circular tube of the expansion cone through a flange.

[0010] Furthermore, a plurality of slide grooves are evenly opened on the outer surface of the expansion cone, and the plurality of expansion modules are slidably connected in the slide grooves. The rear side of the expansion module is slidably connected to the guide groove of the bottom guide plate through a T-shaped slider, so as to realize the radial back and forth movement of the expansion module.

[0011] Furthermore, the extrusion cone is a regular polygonal cone having the same number of sides as the regular polygonal cone of the expansion cone, and the expansion piston rod passes through the front cylinder cover of the front cylinder body and the central axis of the expansion cone in sequence, and its front end is fixedly connected to the front end of the expansion cone.

[0012] Furthermore, the extrusion cone is connected to the extrusion piston through a plurality of extrusion piston rods passing through the expansion cone.

[0013] Furthermore, the T-shaped grooves are evenly distributed on the outer side of the extrusion cone, and the inner side of the sealing groove module is slidably arranged in the T-shaped grooves.

[0014] Furthermore, an overflow hole is opened in the middle of the extrusion piston.

[0015] Furthermore, an exhaust valve is arranged on the rear cylinder bottom of the piston cylinder.

[0016] In summary, the present invention has the following beneficial effects compared with the prior art:

[0017] The present invention solves the technical problems of loose connection between the ends of straight seam welded pipes and low connection efficiency. Through the structural setting of the present invention, compared with the prior art, it has the following advantages: a new processing and forming method for the ports of straight seam welded pipes, which integrates the port diameter expansion and the processing of the sealing groove, so that the ends of the straight seam welded pipe can be tightly connected, which greatly simplifies the installation process, improves the installation efficiency and installation quality, and has practical significance for the production of large-diameter pipeline steel pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the straight seam welded pipe port diameter expansion forming device according to an embodiment of the present invention;

[0019] Figure 2 It is a front cross-sectional view of a straight seam welded pipe port diameter expansion forming device according to an embodiment of the present invention;

[0020] Figure 3 It is a left view of the diameter expansion and forming device for the port of a straight seam welded pipe according to an embodiment of the present invention;

[0021] Figure 4 It is a schematic structural diagram of the expansion cone 4 of an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the guide plate 11 according to an embodiment of the present invention.

[0023] In the figure: 1. Piston cylinder; 2. Expanding piston; 3. Expanding piston rod; 4. Expanding cone; 5. Expanding module; 6. Extrusion cone; 7. Sealing groove module; 8. Extrusion piston rod; 9. Extrusion piston; 10. Front cylinder body; 11. Guide plate; 12. Limiting cylinder; 13. Flange plate; 14. Support frame; 20. Rear cylinder body. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 to Figure 2 The present invention provides a straight seam welded pipe port expansion and forming device, which adopts the mechanical expansion principle. The expansion and forming device comprises three parts, namely, an expansion execution component, a hydraulic transmission component, and a support component, and specifically comprises a piston cylinder 1 and a limiting cylinder 12, and the piston cylinder 1 is coaxially connected to the rear end of the limiting cylinder 12 through a support frame 14; the piston cylinder 1 comprises a front cylinder body 10 and a rear cylinder body 20 which are coaxially connected in sequence;

[0026] An expansion piston 2 is provided in the rear cylinder body 20, and the expansion piston 2 is fixed at one end of the expansion piston rod 3. The expansion piston 2 and the expansion piston rod 3 are threadedly connected, and an expansion cone 4 is fixed on the other end of the expansion piston rod 3, and the expansion cone 4 is locked with the expansion piston rod 3. A plurality of expansion modules 5 are circumferentially slidably arranged on the outside of the expansion cone 4, and an extrusion cone 6 is slidably arranged at the front end of the expansion cone 4. A plurality of sealing groove modules 7 are arranged on the outside of the extrusion cone 6, and the sealing groove module 7 is installed on the front surface of the expansion module 5; the expansion piston rod 3 is located on the central axis of the piston cylinder 1; when expanding, the expansion module 5 directly contacts the inner surface of the tube blank, and the outer surface of the tube blank contacts the inner wall of the limiting cylinder 12.

[0027] The extrusion cone 6 is fixed at one end of the extrusion piston rod 8, and the extrusion cone 6 is locked with the extrusion piston rod 8. An extrusion piston 9 is provided at the other end of the extrusion piston rod 8. The extrusion piston 9 and the extrusion piston rod 8 are threadedly connected. The extrusion piston 9 is slidably connected between the expansion piston rod 3 and the inner wall of the front cylinder body. A guide plate 11 is fixedly installed on the front side of the support frame and located in the limiting cylinder 12. The expansion module 5 is slidably connected to the guide groove of the guide plate 11 distributed along the radial direction; the extrusion piston rod 8 is arranged in parallel with the expansion piston rod 3.

[0028] Furthermore, the expansion cone 4 is a combination structure of a circular tube and a regular polygonal cone. The regular polygonal cone is coaxially installed at the rear end of the circular tube. The outer surface of the regular polygonal cone is consistent with the inclination angle of the bottom surface of the expansion module 5. One end of the expansion piston rod 3 passes through the central axis of the expansion cone 4 and is connected to the front end of the circular tube of the expansion cone 4 through the flange 13.

[0029] Furthermore, a plurality of slide grooves are evenly opened on the outer surface of the expansion cone 4, and a plurality of expansion modules 5 are slidably connected in the slide grooves. The rear side of the expansion module 5 is slidably connected to the guide groove of the bottom guide plate 11 through a T-shaped slider, so as to realize the radial back and forth movement of the expansion module 5.

[0030] Furthermore, the extrusion cone 6 is a regular polygonal cone with the same number of sides as the regular polygonal cone of the expansion cone 4. The expansion piston rod 3 passes through the front cylinder head of the front cylinder body 10 and the central axis of the expansion cone 4 in sequence, and its front end is fixedly connected to the front end of the expansion cone 4.

[0031] Furthermore, the extrusion cone 6 is connected to the extrusion piston 9 through a plurality of extrusion piston rods 8 passing through the expansion cone 4 .

[0032] Furthermore, the outer side surface of the extrusion cone 6 is uniformly distributed with T-shaped grooves, and the inner side of the sealing groove module 7 is slidably arranged in the T-shaped grooves.

[0033] Furthermore, an overflow hole is opened in the middle of the extrusion piston 9.

[0034] Furthermore, an exhaust valve is provided on the rear cylinder bottom 1 of the piston cylinder.

[0035] The working principle of the above structure is:

[0036] Before the expansion, the pipe end is preheated by induction heating. After the part of the pipe to be expanded is inserted between the expansion module 5 and the limiting cylinder 12, oil is introduced into the rod chamber of the rear cylinder body 1 of the piston cylinder, and the expansion piston 2 moves backward to the bottom of the rear cylinder body 20 of the piston cylinder, and the expansion cone 4 is driven to move backward by the expansion piston rod 3, and the expansion module 5 is squeezed outward to squeeze the pipe outward to complete the partial expansion of the straight seam welded pipe port. The rod chamber of the rear cylinder body 20 is depressurized and oil is introduced into the rodless chamber at the same time, and the expansion piston 2 pushes the expansion piston 2 and the expansion cone 4 to reset. When the expansion piston 2 moves to the top of the rear cylinder body 20, the mechanism is reset. After the pipe continues to be partially extended, the device continues to partially expand, and the above actions are repeated until the last partial expansion, at which time the rear cylinder body 2 is pushed to the rear cylinder body 2 0. The rod cavity of the front cylinder 10 enters oil, the expansion piston 2 and the extrusion piston 9 drive the expansion cone 4 and the extrusion cone 6 to move backward, the extrusion expansion module 5 and the sealing groove module 7 move outward, and the expansion module 5 extrude the pipe outward. When the expansion piston 2 moves to the bottom of the rear cylinder 20, the last partial expansion of the straight seam welded pipe port is completed, and the sealing groove module 7 extrude the pipe outward to extrude the sealing groove. When the extrusion piston 9 moves to the bottom of the front cylinder 10, the sealing groove extrusion is completed, the straight seam welded pipe port is expanded and the sealing groove is processed. The rear cylinder 20 and the front cylinder 10 have rod cavities that relieve pressure and the rodless cavity enters oil, so that the expansion piston 2 and the extrusion piston 9 move to the top of the rear cylinder 1 and the front cylinder 10, and the device is restored to the waiting state to complete the expansion of the straight seam welded pipe port.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A straight seam welded pipe port expansion forming device, characterized in that: It comprises a piston cylinder (1) and a limiting cylinder (12), wherein the piston cylinder is coaxially connected to the rear end of the limiting cylinder (12) via a support frame (14); the piston cylinder (1) comprises a front cylinder body (10) and a rear cylinder body (20) which are coaxially connected in sequence; An expanding piston (2) is arranged in the rear cylinder body (20), the expanding piston (2) is fixed to one end of the expanding piston rod (3), an expanding cone (4) is fixed to the other end of the expanding piston rod (3), a plurality of expanding modules (5) are slidably arranged on the outside of the expanding cone (4) along the circumferential direction, an extrusion cone (6) is slidably arranged at the front end of the expanding cone (4), a plurality of sealing groove modules (7) are arranged on the outside of the extrusion cone (6), and the sealing groove modules (7) are installed on the front surface of the expanding module (5); the expanding piston rod (3) is located on the central axis of the piston cylinder (1); The extrusion cone (6) is fixed to one end of the extrusion piston rod (8), and the other end of the extrusion piston rod (8) is provided with an extrusion piston (9), and the extrusion piston (9) is slidably connected between the expansion piston rod (3) and the inner wall of the front cylinder body (10), and a guide plate (11) is fixedly installed on the front side of the support frame and located in the limiting cylinder (12), and the expansion module (5) is slidably connected to the guide groove distributed radially on the guide plate (11); the extrusion piston rod (8) is arranged in parallel with the expansion piston rod (3).

2. The device for expanding and forming the end of a straight seam welded pipe according to claim 1, characterized in that: The expansion cone (4) is a composite structure of a circular tube and a regular polygonal cone. The regular polygonal cone is coaxially mounted on the rear end of the circular tube. The outer surface of the regular polygonal cone is consistent with the bottom surface inclination angle of the expansion module (5). One end of the expansion piston rod (3) passes through the central axis of the expansion cone (4) and is connected to the front end of the circular tube of the expansion cone (4) through a flange (13).

3. The device for expanding and forming the end of a straight seam welded pipe according to claim 1 or 2, characterized in that: The outer surface of the expansion cone (4) is evenly provided with a plurality of slide grooves, and the plurality of expansion modules (5) are slidably connected in the slide grooves. The rear side of the expansion module (5) is slidably connected to the guide groove of the bottom guide plate (11) via a T-shaped slider, so as to enable the expansion module (5) to move back and forth in the radial direction.

4. The device for expanding and forming the end of a straight seam welded pipe according to claim 2, characterized in that: The extrusion cone (6) is a regular polygonal cone having the same number of sides as the regular polygonal cone of the expansion cone (4); the expansion piston rod (3) passes through the front cylinder cover of the front cylinder body (10) and the central axis of the expansion cone (4) in sequence, and its front end is fixedly connected to the front end of the expansion cone (4).

5. The device for expanding and forming the end of a straight seam welded pipe according to claim 1, characterized in that: The extrusion cone (6) is connected to the extrusion piston (9) through a plurality of extrusion piston rods (8) passing through the expansion cone (4).

6. The device for expanding and forming the end of a straight seam welded pipe according to claim 1, characterized in that: The T-shaped grooves are evenly distributed on the outer side surface of the extrusion cone (6), and the inner side of the sealing groove module (7) is slidably arranged in the T-shaped grooves.

7. The device for expanding and forming the end of a straight seam welded pipe according to claim 1, characterized in that: An overflow hole is formed in the middle of the extrusion piston (9).

8. The device for expanding and forming the end of a straight seam welded pipe according to claim 1, characterized in that: An exhaust valve is arranged on the rear cylinder bottom of the piston cylinder (1).

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