A spiral steel pipe end expanding device

Abstract

The utility model discloses a spiral steel pipe end expanding device, including base, the top fixed mounting of base has the stand, the inboard of stand is fixedly connected with pipe fitting clamping mechanism through the cylinder, the top fixed mounting of stand has the hydraulic cylinder. The utility model adopts detachable design to the clamping piece of spiral steel pipe, makes the device can adapt to multiple diameter, the thickness of wall spiral steel pipe, breaks the limitation of traditional fixed clamp only adapting single -specification steel pipe, and the applicable range improves significantly, can ensure the positioning accuracy of clamp after replacement simultaneously, avoids the steel pipe center deviation caused by clamp replacement, effectively guarantees the coaxial degree of pipe end expansion and processing quality, in the high stability in the expanding process, can effectively reduce pipe end deformation, wall uneven etc. problem, improves the processing efficiency while guaranteeing the product processing precision, reduces the production cost and the operation complexity of spiral steel pipe end expansion, has better use effect.

Description

Technical Field

[0001] This utility model relates to the field of spiral steel pipe processing technology, specifically a spiral steel pipe end expansion device. Background Technology

[0002] In the production and application of spiral welded steel pipes, pipe end expansion is an important subsequent processing step. By expanding the diameter, the inner diameter of the pipe end can be changed, ensuring smooth connection of steel pipes of different diameters, or providing space for welding flanges, sleeves and other accessories at the pipe end, directly affecting the connection sealing and structural stability of the pipeline system.

[0003] Existing spiral steel pipe end-expanding devices typically employ fixed clamping structures, meaning each clamp can only accommodate spiral steel pipes of a single diameter. When expanding spiral steel pipes of different diameters and wall thicknesses, the clamping mechanism's fixing bolts must be completely disassembled, and the entire clamp assembly replaced. This process is not only cumbersome and time-consuming, but also prone to misalignment between the pipe center and the expanding head center due to positioning deviations during clamp disassembly and reinstallation. This can lead to pipe end deformation, uneven wall thickness, and other problems, affecting product processing quality. Therefore, we propose a spiral steel pipe end-expanding device to address the problems mentioned in the background. Utility Model Content

[0004] The purpose of this utility model is to provide a spiral steel pipe end expansion device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a spiral steel pipe end expansion device, comprising a base, a support frame fixedly installed on the top of the base, a pipe clamping mechanism fixedly connected to the inner side of the support frame via a cylinder, a hydraulic cylinder fixedly installed on the top of the support frame, a lifting seat fixedly installed through the driving end of the hydraulic cylinder to the inner side of the support frame, a connecting plate fixedly installed at the bottom of the lifting seat via bolts, and an expansion head body welded to the bottom of the connecting plate via a connecting rod.

[0006] Furthermore, the pipe clamping mechanism includes a mounting base, which is fixedly connected to the drive end of the cylinder. A connecting slot is provided on the top of the mounting base on the side away from the cylinder. A connecting block is inserted into the inside of the connecting slot. A positioning rod is also fixedly installed on the bottom of the inner wall of the connecting slot. The positioning rod is movably connected to the connecting block. A clamping seat for fixing the spiral steel pipe is fixedly connected on the side of the connecting block away from the cylinder.

[0007] Furthermore, a fixed shaft is installed on the top of the mounting base, and a limiting pressure plate is rotatably connected to the fixed shaft. An arc-shaped pressure groove adapted to the limiting pressure plate is opened on the side of the clamping base near the cylinder.

[0008] Furthermore, a locking assembly connected to a positioning rod is fixedly installed on the top of the limiting pressure plate. The locking assembly includes a cylindrical shell, which is fixedly connected to the top of the limiting pressure plate. A locking socket is slidably connected inside the cylindrical shell in the vertical direction. A pull rod is fixedly connected to the top of the locking socket, and a pull handle is fixedly connected to the top of the pull rod extending through to the outside of the cylindrical shell.

[0009] Furthermore, a thrust spring is fitted onto the surface of the pull rod located inside the cylindrical shell, and the two ends of the thrust spring are in contact with the top of the inner wall of the cylindrical shell and the top of the locking socket, respectively.

[0010] Furthermore, the top of the positioning rod is provided with a locking hole that is compatible with the locking socket.

[0011] Furthermore, guide rods are fixedly connected to both sides of the lifting seat corresponding to the upright, and guide slots adapted to the guide rods are provided on the upright.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model adopts a detachable design for the clamping component of spiral steel pipes, enabling the device to adapt to spiral steel pipes of various diameters and wall thicknesses. This breaks the limitation of traditional fixed clamps that are only suitable for a single specification of steel pipe, significantly expanding the scope of application. At the same time, it can ensure the positioning accuracy of the clamp after replacement, avoiding the displacement of the steel pipe center due to clamp replacement, effectively ensuring the coaxiality and processing quality of the pipe end expansion. It has high stability during the expansion process, effectively reducing problems such as pipe end deformation and uneven wall thickness. While improving processing efficiency, it also ensures product processing accuracy, reduces the production cost and operational complexity of spiral steel pipe end expansion, and has good application effects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the mounting base of this utility model;

[0016] Figure 3 This is a half-sectional view of the structure of the mounting base of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the clamping base of this utility model.

[0018] In the diagram: 1. Base; 2. Stand; 3. Cylinder; 4. Pipe clamping mechanism; 41. Mounting seat; 42. Connecting slot; 43. Connecting block; 44. Positioning rod; 45. Clamping seat; 46. Fixed shaft; 47. Limiting pressure plate; 48. Arc-shaped pressure groove; 49. Locking assembly; 491. Cylindrical shell; 492. Locking socket; 493. Pull rod; 494. Pull handle; 495. Thrust spring; 5. Hydraulic cylinder; 6. Lifting seat; 7. Connecting plate; 8. Expanding head body; 9. Guide rod; 10. Guide groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 A spiral steel pipe end expansion device includes a base 1, with a support frame 2 fixedly installed on the top of the base 1. The base 1 is made of high-strength cast iron and has anti-slip and shock-absorbing pads on the bottom, providing a stable support foundation for the entire device and preventing displacement of the device due to vibration during the expansion operation. The support frame 2 is a portal frame steel structure with good structural rigidity, capable of withstanding the axial and radial forces generated during the expansion process. A pipe clamping mechanism 4 is fixedly connected to the inner side of the support frame 2 via a cylinder 3. Cylinder mounting plates are symmetrically arranged on the inner side of the support frame 2, and the cylinders 3 are fixed to the mounting plates with bolts. The two cylinders 3 can be driven synchronously, and the extension and retraction of the piston rod drives the pipe clamping mechanism 4 to move horizontally, realizing the clamping and fixing of spiral steel pipes of different lengths, while ensuring that the steel pipe is subjected to uniform force during the clamping process and avoiding deformation of the steel pipe. A hydraulic cylinder 5 is fixedly installed on the top of the support frame 2, and the hydraulic cylinder 5 drives... A lifting seat 6 is fixedly installed inside the upright 2 through the moving end. The hydraulic cylinder 5 is a double-acting hydraulic cylinder, which provides stable lifting power through the hydraulic system. It can accurately control the descent speed and pressure of the lifting seat 6 to meet the expansion force requirements of spiral steel pipes with different wall thicknesses. The lifting seat 6 is made of alloy steel plate and is fixedly connected to the driving end of the hydraulic cylinder 5 through a flange to ensure stable power transmission. A connecting plate 7 is fixedly installed at the bottom of the lifting seat 6 by bolts. The bottom of the connecting plate 7 is welded to the expanding head body 8 through a connecting rod. The connecting plate 7 is a transition connecting component and is detachably connected to the lifting seat 6 by bolts. It is convenient to replace the expanding head body 8 of different specifications according to the size of the hole to be expanded. The expanding head body 8 is made of high-strength alloy tool steel and has a wear-resistant coating on the surface. Its shape is designed as conical or stepped according to the expansion requirements, which can realize the gradual expansion of the pipe end and reduce the risk of pipe end cracking.

[0021] The pipe clamping mechanism 4 includes a mounting base 41, which is fixedly connected to the drive end of the cylinder 3. The mounting base 41 is a rectangular steel structure, and one side is rigidly connected to the drive end of the cylinder 3 through a flange to ensure that the power of the cylinder 3 can be stably transmitted to the clamping assembly. A connecting slot 42 is provided on the top of the side of the mounting base 41 away from the cylinder 3. The connecting slot 42 is a rectangular groove structure, and a connecting block 43 is inserted into the inside of the connecting slot 42. The connecting block 43 and the connecting slot 42 are clearance fit, which ensures smooth insertion and initial positioning. A positioning rod 44 is also fixedly installed on the bottom of the inner wall of the connecting slot 42. The positioning rod 44 is... The cylindrical structure is welded perpendicularly to the mounting base 41. The positioning rod 44 is movably connected to the connecting plug 43. The bottom of the connecting plug 43 has a positioning hole that matches the positioning rod 44. Through the cooperation of the positioning rod 44 and the positioning hole, the connecting plug 43 is accurately positioned to avoid left and right displacement after insertion. A clamping seat 45 for fixing the spiral steel pipe is fixedly connected to the side of the connecting plug 43 away from the cylinder 3. The inner side of the clamping seat 45 has an arc-shaped clamping groove that matches the outer wall of the spiral steel pipe. The surface of the arc-shaped groove is provided with a rubber anti-slip pad, which can enhance the clamping friction of the steel pipe and avoid damage to the outer wall of the steel pipe during the clamping process.

[0022] A fixed shaft 46 is mounted on the top of the mounting base 41. A limiting pressure plate 47 is rotatably connected to the fixed shaft 46. The limiting pressure plate 47 is a metal plate, one end of which is rotatably connected to the fixed shaft 46 and can rotate around the fixed shaft 46. An arc-shaped pressure groove 48 that matches the limiting pressure plate 47 is provided on the side of the clamping base 45 near the cylinder 3. When the connecting plug 43 is inserted into the connecting slot 42, the limiting pressure plate 47 is rotated so that the other end of the limiting pressure plate 47 is embedded in the arc-shaped pressure groove 48, which can form a longitudinal limit on the connecting plug 43, preventing the connecting plug 43 from coming off upward due to vibration during the diameter expansion operation, and ensuring the installation stability of the clamping base 45.

[0023] A locking assembly 49 connected to a positioning rod 44 is fixedly installed on the top of the limiting pressure plate 47. The locking assembly 49 includes a cylindrical shell 491, which is fixedly connected to the top of the limiting pressure plate 47. The cylindrical shell 491 is a hollow cylindrical structure with a guide groove on its inner wall to provide sliding guidance for the locking socket 492. The locking socket 492 is slidably connected to the inside of the cylindrical shell 491 in the vertical direction. A pull rod 493 is fixedly connected to the top of the locking socket 492. The top of the pull rod 493 extends through to the outside of the cylindrical shell 491 and is fixedly connected to a pull handle 494. By pulling the pull handle 494, the pull rod 493 and the locking socket 492 can slide up and down along the cylindrical shell 491 to realize the locking and unlocking functions.

[0024] A thrust spring 495 is fitted onto the surface of the pull rod 493 located inside the cylindrical shell 491. The two ends of the thrust spring 495 are in contact with the top of the inner wall of the cylindrical shell 491 and the top of the locking socket 492, respectively. In its natural state, the elastic thrust of the thrust spring 495 acts downwards on the locking socket 492, keeping the locking socket 492 in a downward-extended state. When the limiting pressure plate 47 rotates into the arc-shaped pressure groove 48, the locking socket 492 automatically inserts into the locking hole of the positioning rod 44 under the action of the thrust spring 495, thus realizing the locking of the limiting pressure plate 47 and the positioning rod 492. The rigid locking mechanism of the 4-positioning rod prevents the limiting pressure plate 47 from rotating on its own. When the clamping seat 45 needs to be replaced, simply pull the handle 494 upward to compress the thrust spring 495 and cause the locking socket 492 to disengage from the locking hole of the positioning rod 44. Then, the limiting pressure plate 47 can be rotated to unlock. The operation is simple and the locking reliability is high. The top of the positioning rod 44 has a locking hole that matches the locking socket 492. The locking hole is a blind hole structure, and its diameter matches the outer diameter of the locking socket 492, ensuring that there is no obvious gap after the locking socket 492 is inserted, thus improving the locking stability.

[0025] Guide rods 9 are fixedly connected to both sides of the lifting seat 6 corresponding to the upright 2. The guide rods 9 are cylindrical optical shafts, welded perpendicularly to the lifting seat 6, and their surfaces are chrome-plated, providing good wear resistance and smoothness. The upright 2 has guide grooves 10 that are compatible with the guide rods 9. The guide rods 9 pass through linear bearings and are slidably connected to the guide grooves 10. During the lifting process of the lifting seat 6 driven by the hydraulic cylinder 5, the guide rods 9 slide synchronously along the guide grooves 10, providing a stable guiding effect for the lifting seat 6, preventing the lifting seat 6 from tilting due to uneven force, ensuring that the expanding head body 8 always moves in the vertical direction, and guaranteeing the coaxiality and dimensional accuracy of the expanded pipe end.

[0026] This utility model adopts a detachable design for the clamping component of spiral steel pipes, enabling the device to adapt to spiral steel pipes of various diameters and wall thicknesses. This breaks the limitation of traditional fixed clamps that are only suitable for a single specification of steel pipe, significantly expanding the scope of application. At the same time, it can ensure the positioning accuracy of the clamp after replacement, avoiding the displacement of the steel pipe center due to clamp replacement, effectively ensuring the coaxiality and processing quality of the pipe end expansion. It has high stability during the expansion process, effectively reducing problems such as pipe end deformation and uneven wall thickness. While improving processing efficiency, it also ensures product processing accuracy, reduces the production cost and operational complexity of spiral steel pipe end expansion, and has good application effects.

[0027] In use, select a clamping seat 45 with a corresponding arc-shaped clamping groove according to the diameter of the spiral steel pipe to be expanded. Pull the handle 494 of the locking assembly 49 upward. The handle 494 drives the pull rod 493 and the locking socket 492 to slide upward along the cylindrical shell 491, compressing the thrust spring 495 until the locking socket 492 is completely disengaged from the locking hole at the top of the positioning rod 44. Then rotate the limiting pressure plate 47 around the fixed axis 46, so that the free end of the limiting pressure plate 47 is disengaged from the arc-shaped pressure groove 48 of the original clamping seat 45. Hold the original clamping seat 45 and pull it outward to pull the connecting plug 43 out of the connecting slot 42 of the mounting base 41, completing the disassembly of the old clamp. Reverse the above steps to install the new clamp. Then hoist the spiral steel pipe to be expanded above the base 1, so that the end of the steel pipe... Align the reamer head body 8 directly below it, activate the two side cylinders 3, which drive the two side pipe clamping mechanisms 4 to move towards the steel pipe until the arc-shaped clamping groove of the clamping seat 45 is tightly fitted with the outer wall of the steel pipe. Continue to control the cylinder 3 to apply appropriate clamping force to ensure that the steel pipe is firmly fixed and without obvious deformation. Close the cylinder 3 and lock the piston rod position. Then activate the hydraulic cylinder 5. The drive end of the hydraulic cylinder 5 drives the lifting seat 6 to move downward in the vertical direction. The guide rods 9 on both sides of the lifting seat 6 slide synchronously along the guide groove 10 of the upright 2 to ensure that the reamer head body 8 descends smoothly. The reamer head body 8 is gradually inserted into the end of the spiral steel pipe, and the pipe end is progressively enlarged through the conical or stepped structure.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spiral steel pipe end expansion device, comprising a base (1), characterized in that: A support frame (2) is fixedly installed on the top of the base (1). A pipe clamping mechanism (4) is fixedly connected to the inner side of the support frame (2) via a cylinder (3). A hydraulic cylinder (5) is fixedly installed on the top of the support frame (2). A lifting seat (6) is fixedly installed on the inner side of the hydraulic cylinder (5) through the drive end of the hydraulic cylinder (5). A connecting plate (7) is fixedly installed on the bottom of the lifting seat (6) via bolts. A hole-expanding head body (8) is welded to the bottom of the connecting plate (7) via a connecting rod.

2. The spiral steel pipe end expansion device according to claim 1, characterized in that: The pipe clamping mechanism (4) includes a mounting base (41), which is fixedly connected to the drive end of the cylinder (3). A connecting slot (42) is provided on the top of the mounting base (41) away from the cylinder (3). A connecting plug (43) is inserted into the connecting slot (42). A positioning rod (44) is also fixedly installed on the bottom of the inner wall of the connecting slot (42). The positioning rod (44) is movably connected to the connecting plug (43). A clamping seat (45) for fixing the spiral steel pipe is fixedly connected on the side of the connecting plug (43) away from the cylinder (3).

3. The spiral steel pipe end expansion device according to claim 2, characterized in that: A fixed shaft (46) is installed on the top of the mounting base (41), and a limiting pressure plate (47) is rotatably connected on the fixed shaft (46). An arc-shaped pressure groove (48) adapted to the limiting pressure plate (47) is opened on the side of the clamping base (45) near the cylinder (3).

4. The spiral steel pipe end expansion device according to claim 3, characterized in that: The top of the limiting pressure plate (47) is fixedly installed with a locking assembly (49) connected to the positioning rod (44). The locking assembly (49) includes a cylindrical shell (491), which is fixedly connected to the top of the limiting pressure plate (47). A locking socket (492) is slidably connected inside the cylindrical shell (491) in the vertical direction. A pull rod (493) is fixedly connected to the top of the locking socket (492). The top of the pull rod (493) extends through the cylindrical shell (491) and is fixedly connected to a pull handle (494).

5. The spiral steel pipe end expansion device according to claim 4, characterized in that: A thrust spring (495) is fitted on the surface of the pull rod (493) located inside the cylindrical shell (491). The two ends of the thrust spring (495) are in contact with the top of the inner wall of the cylindrical shell (491) and the top of the locking socket (492), respectively.

6. The spiral steel pipe end expansion device according to claim 5, characterized in that: The top of the positioning rod (44) has a locking hole that is compatible with the locking socket (492).

7. The spiral steel pipe end expansion device according to claim 6, characterized in that: The lifting seat (6) is fixedly connected to guide rods (9) on both sides of the support frame (2), and the support frame (2) is provided with guide grooves (10) that are compatible with the guide rods (9).

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