A device for expanding and forming the end of a straight seam welded pipe

Abstract

The present invention discloses a device for expanding and forming the port of a straight seam welded pipe, which comprises: a piston cylinder and a limiting cylinder, and 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; the portion of the straight seam welded pipe to be expanded is sleeved around the expansion module, the rear cylinder body works, drives the expansion cone to extrude the expansion module outward, extrude the pipe material, and realize expansion, and the front cylinder body works, drives the extrusion cone to extrude the sealing groove module outward, and presses out a sealing groove on the inner wall of the pipe material; the present invention processes and forms the expansion and extrusion of the port of the straight seam welded pipe and the extrusion of the sealing groove as a whole, expands the port of one end of the steel pipe, so that the ends of each steel pipe can be tightly connected with other steel pipes, facilitates connection on the construction site, simplifies the installation process, improves the installation efficiency and quality, and 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 diameter expansion forming device for a straight seam welded pipe port. 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 are constantly increasing, and pipe manufacturing technology and equipment are also constantly innovating and improving. At present, welding is mostly used to connect steel pipes on construction sites. Workers need to find pipes with similar end diameters from a large pile of pipes and hang them together for welding. The project progress is very slow and the labor intensity of workers is also very high. Currently, there are two main types of expanders: hydraulic and mechanical. For expanding the ends of large-diameter steel pipes, hydraulic expanders have problems such as difficulty in adjusting the mold cone specifications, a large number of molds, and very high costs. At present, there is no expanding equipment that can expand and form a sealing groove in one. Generally, after the pipe blank is expanded, a sealing groove is additionally processed at the end of the pipe.

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

[0004] The present invention provides a straight seam welded pipe port diameter 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 two ends of each steel pipe can be tightly connected, which facilitates the connection of 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 device for expanding and forming the end of a straight seam welded pipe comprises a piston cylinder and a limiting cylinder, wherein the piston cylinder is coaxially connected to the rear end of the limiting cylinder via a support frame; the piston cylinder comprises a front cylinder body and a rear cylinder body coaxially connected in sequence;

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

[0008] The extrusion cone is fixed to 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 rail disk 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 along the guide rail disk; the extrusion piston rod is arranged parallel to 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 sliding grooves are evenly opened on the outer surface of the expansion cone, and the plurality of expansion modules are slidably connected in the sliding grooves. The rear side of the expansion module is slidably connected to the guide groove of the bottom guide rail 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 with 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 via a plurality of extrusion piston rods passing through the expansion cone.

[0013] Furthermore, the outer side surface of the extrusion cone is evenly distributed with the T-shaped grooves, 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 provided on the rear cylinder bottom of the piston cylinder.

[0016] In summary, the present invention has the following beneficial effects compared to 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 existing technology, it has the following advantages: a new processing and forming method for the ends of straight seam welded pipes, which integrates the port diameter expansion and the processing of the sealing groove, facilitates the close connection between the ends of the straight seam welded pipe, 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 This is a front view of a device for expanding and forming a straight seam welded pipe port according to an embodiment of the present invention;

[0019] Figure 2 This is a front cross-sectional view of a device for expanding and forming a longitudinally welded pipe port according to an embodiment of the present invention;

[0020] Figure 3 This is a left side view of the device for expanding and forming the end of a straight seam welded pipe according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic structural diagram of the diameter-expanding cone 4 according to an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the guide rail 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; 14. Support frame; 20. Rear cylinder body. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0025] See also Figures 1 to 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: an expansion actuator, a hydraulic transmission component, and a support component. Specifically, the device comprises a piston cylinder 1 and a limiting cylinder 12. 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 expanding piston 2 is provided in the rear cylinder body 20, and the expanding piston 2 is fixed at one end of the expanding piston rod 3. The expanding piston 2 and the expanding piston rod 3 are threadedly connected. An expanding cone 4 is fixed on the other end of the expanding piston rod 3, and the expanding cone 4 is locked with the expanding piston rod 3. A plurality of expanding modules 5 are circumferentially slidably provided on the outside of the expanding cone 4, and an extrusion cone 6 is slidably provided at the front end of the expanding cone 4. A plurality of sealing groove modules 7 are provided on the outside of the extrusion cone 6, and the sealing groove module 7 is 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; when expanding, the expanding 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 rail 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 distributed radially along the guide rail plate 11; the extrusion piston rod 8 is arranged parallel to 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, multiple sliding grooves are evenly opened on the outer surface of the expansion cone 4, and multiple expansion modules 5 are slidably connected in the sliding grooves. The rear side of the expansion module 5 is slidably connected to the guide groove of the bottom guide rail plate 11 through a T-shaped slider, which is used 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, T-shaped grooves are uniformly 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 groove.

[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 supplied to 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 expansion of the straight seam welded pipe port. The rod chamber of the rear cylinder body 20 is depressurized and oil is supplied to 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. The above actions are repeated until the last partial expansion. At this time, the rear cylinder body 2 is pushed to the rear cylinder body 2. 0. Oil enters the rod cavity of the front cylinder body 10, and the expanding piston 2 and the extruding piston 9 drive the expanding cone 4 and the extruding cone 6 to move backward. The extruding and expanding module 5 and the sealing groove module 7 move outward, and the expanding module 5 squeezes the pipe outward. When the expanding piston 2 moves to the bottom of the rear cylinder body 20, the last partial expansion of the straight seam welded pipe port is completed, and the sealing groove module 7 squeezes the pipe outward to extrude the sealing groove. When the extruding piston 9 moves to the bottom of the front cylinder body 10, the sealing groove extrusion is completed, the straight seam welded pipe port is expanded and the sealing groove is processed. The rod cavity of the rear cylinder body 20 and the front cylinder body 10 is depressurized and oil enters the rodless cavity at the same time, so that the expanding piston 2 and the extruding piston 9 move to the top of the rear cylinder body 1 and the front cylinder body 10, and the device is restored to the standby state to complete the expansion of the straight seam welded pipe port.

[0037] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for expanding and forming the end of a straight seam welded pipe, 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 provided 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 provided on the outside of the expanding cone (4) for sliding along the circumferential direction, an extrusion cone (6) is provided on the front end of the expanding cone (4), a plurality of sealing groove modules (7) are provided 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 along the radial direction of 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 combined 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 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 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 guide rail 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 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.

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 provided 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 provided on the rear cylinder bottom of the piston cylinder (1).

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