Device for expanding pipe diameter of steel pipe

Abstract

The utility model discloses a device for expanding the pipe diameter of a steel pipe, belongs to the technical field of tool equipment technical libraries, and solves the problem that a hydraulic cylinder is easily damaged due to the fact that the steel pipe is not stably placed in an existing pipe expanding device. The device for expanding the pipe diameter of the steel pipe comprises a first bottom plate and guide rods installed on the periphery of the top of the first bottom plate, each guide rod is sleeved with a spring, the guide rods above the springs are movably sleeved with a supporting plate, a jack is arranged between the first bottom plate and the supporting plate, and the jack is connected with the first bottom plate. The jack is detachably mounted on the first bottom plate, a conical head is movably inserted into the top of the supporting rod, a top plate is arranged on the guide rods above the supporting rod, limiting nuts are in threaded connection with the guide rods at the upper end and the lower end of the top plate, and a positioning column is detachably arranged at the bottom of the top. The central axis of the conical head coincides with the central axis of the positioning column. According to the device for expanding the pipe diameter of the steel pipe, the hydraulic cylinder is effectively prevented from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of tooling equipment technology, and more specifically, it relates to a device for expanding the diameter of a steel pipe. Background Technology

[0002] During pipeline connection, when two steel pipes of different diameters are joined, the smaller diameter pipe is typically expanded to match the diameter of its end, thus ensuring a stronger weld. Existing pipe expansion devices generally include a worktable, a hydraulic cylinder, and a conical head. The conical head is installed at the output end of the hydraulic cylinder. When expansion is needed, the steel pipe is placed on the worktable, and then the hydraulic cylinder is activated. The cylinder extends, driving the conical head to insert into the steel pipe. As the conical head continues to extend, the diameter of the steel pipe increases.

[0003] In existing steel pipe expansion devices, the cone head is directly fixed to the output end of the hydraulic cylinder. During use, if the steel pipe shakes, it can easily apply bending moment to the hydraulic cylinder, causing damage to the hydraulic cylinder. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a device for expanding the diameter of steel pipes, which has high stability during the expansion process and can avoid the problem of radial bending moment on the jack.

[0005] The technical solution of this utility model is as follows: a device for expanding the diameter of a steel pipe includes a first base plate and guide rods respectively installed around the top of the first base plate. Each guide rod is fitted with a spring. A support plate is movably fitted on the guide rod above the spring. A jack is provided between the first base plate and the support plate, and the jack is detachably installed on the first base plate. A cone head is movably inserted into the top of the support plate. A top plate is provided on the guide rod above the support plate. Limit nuts are threaded onto the guide rods at the upper and lower ends of the top plate. A positioning post is detachably provided at the bottom of the top plate. The central axis of the cone head coincides with the central axis of the positioning post.

[0006] As a further improvement, the support plate is provided with a pin groove, and the bottom of the cone head is provided with a plug-in post that is adapted to the pin groove, and the plug-in post is movably inserted into the pin groove.

[0007] Furthermore, the bottom of the pin groove is provided with a protrusion, which has a cross-shaped structure, and the bottom of the insertion post is provided with a groove that adapts to the protrusion, which is movably fitted onto the protrusion.

[0008] Furthermore, the central axis of the pin groove coincides with the central axis of the support plate.

[0009] Furthermore, the upper part of the positioning post is a cylindrical structure, and the top of the positioning post is a frustum-cone structure.

[0010] Furthermore, the bottom of the first base plate is provided with a height-adjustable support structure, which includes lead screws, fastening nuts, and a second base plate. There are four lead screws in total, all of which are threadedly connected to the first base plate. The four lead screws are located around the perimeter of the first base plate, and the bottom of each lead screw is connected to the second base plate. The lead screw below the first base plate is threadedly connected to a fastening nut, and the fastening nut is in contact with the lower end face of the first base plate.

[0011] Furthermore, the bottom of the second base plate is provided with anti-slip texture.

[0012] Beneficial effects

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] 1. The present invention relates to a device for expanding the diameter of a steel pipe. By placing a cone on a support plate and using a positioning column to position the other end of the steel pipe, the cone does not directly contact the jack during the expansion process. Furthermore, the positioning column and guide rod guide and position the cone, thus preventing the jack from being subjected to radial bending moment.

[0015] 2. This utility model discloses a device for expanding the diameter of a steel pipe. The height of the top plate can be adjusted by tightening the limiting nuts at both ends of the top plate. Furthermore, both the cone head and the positioning column are detachable, making the device applicable to expanding the diameter of different steel pipes and thus having a wider range of applications. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a top view of the support plate in this utility model.

[0018] Figure 3 This is a schematic diagram of the cone head structure from below in this utility model.

[0019] Wherein: 1-First base plate, 2-Support plate, 3-Top plate, 4-Guide rod, 5-Spring, 6-Jack, 7-Pin groove, 8-Cone head, 9-Limit nut, 10-Positioning post, 11-Plug-in post, 12-Protrusion, 13-Groove, 14-Threaded rod, 15-Fastening nut, 16-Second base plate. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0021] See Figure 1-3 A device for expanding the diameter of a steel pipe includes a first base plate 1 and guide rods 4 respectively installed around the top of the first base plate 1. Each guide rod 4 is fitted with a spring 5. A support plate 2 is movably fitted on the guide rod 4 above the spring 5. The spring 5 provides auxiliary support. After the pipe expansion is completed, a jack 6 is installed and lowered. If the jack 6 lowers too quickly, the spring 5 acts as a buffer to prevent the support plate 2 from colliding with the jack 6 and causing damage to the support plate 2 or the jack 6. The jack 6 is provided between the first base plate 1 and the support plate 2 and is detachably installed on the first base plate 1. A cone head 8 is movably inserted into the top of the support plate 2. A top plate 3 is provided on the guide rods 4 above the support plate 2. Limit nuts 9 are threadedly connected to the guide rods 4 at both ends of the top plate 3. A positioning post 10 is detachably provided at the bottom of the top plate 3. The central axis of the cone 8 coincides with the central axis of the positioning column 10. In use, one end of the steel pipe to be expanded is placed directly on the cone 8, and then the jack 6 is operated to raise its output end, which drives the support plate 2, the cone 8, and the steel pipe to be expanded to move upward. The positioning column 10 will be inserted into the other end of the steel pipe to be expanded, playing a positioning role. As the steel pipe to be expanded continues to rise, when the other end of the steel pipe to be expanded is in contact with the lower end surface of the top plate 3, the cone 8 squeezes one end of the steel pipe to be expanded, thereby achieving the purpose of expanding the diameter. This device places the cone 8 on the support plate 2 and uses the positioning column 10 to position the other end of the steel pipe. During the expansion process, the cone 8 does not directly contact the jack 6, and the positioning column 10 and the guide rod 4 guide and position it, which can avoid the jack 6 being subjected to radial bending moment and also avoid the problem of steel pipe deformation.

[0022] In this embodiment, the support plate 2 is provided with a pin groove 7, and the bottom of the cone head 8 is provided with a plug post 11 that is adapted to the pin groove 7. The plug post 11 is movably inserted into the pin groove 7, which facilitates the replacement of the cone head 8. This allows the device to expand the diameter of steel pipes of different diameters, making it applicable to the expansion operation of different steel pipes and with a wider range of applications.

[0023] Preferably, after the steel pipe has been enlarged, it often becomes tightly fitted with the enlarged cone, making it difficult to remove the steel pipe from the cone. In this application, the cone 8 is movably inserted into the pin groove 7. When the steel pipe becomes tightly fitted with the cone 8 after enlargement and is difficult to separate, the steel pipe and the cone 8 can be removed together. Other tools can be used to separate the steel pipe from the cone 8, and then the cone 8 can be inserted into the pin groove 7 to facilitate the removal of the steel pipe after enlargement.

[0024] In this embodiment, the bottom of the pin groove 7 is provided with a protrusion 12, which has a cross-shaped structure. The bottom of the insertion post 11 is provided with a groove 13 that is adapted to the protrusion 12. The groove 13 is movably fitted on the protrusion 12. This prevents the cone head 8 from rotating during the expansion process, which would affect the expansion of the steel pipe and further improve the stability of the cone head 8 placed on the support plate 2.

[0025] In this embodiment, the central axis of the pin groove 7 coincides with the central axis of the support plate 2, and the central axis of the pin groove 7 coincides with the central axis of the insertion post 11, so that the cone head 8 is installed at the center of the support plate 2. During the expansion process, the cone head 8 applies downward pressure to the support plate 2. The cone head 8 is located at the center of the support plate 2, so that the support plate 2 is subjected to uniform force, effectively extending the service life of the support plate 2.

[0026] In this embodiment, the upper part of the positioning post 10 is a cylindrical structure, and the diameter of the upper part of the positioning post 10 is adapted to the inner diameter of the steel pipe to be expanded; the top of the positioning post 10 is a frustum conical structure, and the diameter of the positioning post 10 gradually decreases from the middle part of the positioning post 10 to the top of the positioning post 10; this avoids the steel pipe to be expanded being placed on the cone head 8 with a slight tilt, which would cause the steel pipe to be expanded to fail to be fitted onto the positioning post 10, and makes it easier for the other end of the steel pipe to be expanded to be fitted onto the positioning post 10.

[0027] In this embodiment, the bottom of the first base plate 1 is provided with a height-adjustable support structure. The support structure includes lead screws 14, fastening nuts 15, and a second base plate 16. There are four lead screws 14, all of which are threadedly connected to the first base plate 1. The four lead screws 14 are located around the perimeter of the first base plate 1, and their bottoms are connected to the second base plate 16. The lead screws 14 below the first base plate 1 are threadedly connected to fastening nuts 15, and the fastening nuts 15 are in contact with the lower end face of the first base plate 1. The overall height or levelness of the device can be adjusted by turning the lead screws 14. When adjusted to the desired state... Tighten the fastening nut 15 so that the top of the fastening nut 15 is in close contact with the lower end face of the first base plate 1, which provides support for the first base plate 1 and further improves the stability of the first base plate 1. It can also prevent the threads on the screw 14 from deforming or being damaged due to excessive downward force on the first base plate 1 during the pipe expansion process. When the device is placed on an uneven ground or table, the screw 14, which is threaded to the first base plate 1, can be tightened to make the first base plate 1 level, so as to avoid the steel pipe to be expanded from tilting or shaking due to the tilt of the first base plate 1 during the pipe diameter expansion process, which would cause problems such as steel pipe deformation.

[0028] In this embodiment, the bottom of the second base plate 16 is provided with anti-slip texture to increase the roughness of the lower end surface of the second base plate 16, thereby increasing the friction between the second base plate 16 and the ground or tabletop, and thus improving the stability of the device.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. An apparatus for expanding the diameter of a steel pipe, characterized by comprising: The utility model provides a height adjustable support structure, the support structure includes the first bottom plate (1), the guide rod (4) that installs respectively in the first bottom plate (1) top four around, every guide rod (4) is all set with spring (5) on, the guide rod (4) on the upper side of spring (5) is movably set with support plate (2), the first bottom plate (1) with support plate (2) between be equipped with jack (6), and the jack (6) detachably install on the first bottom plate (1), the top of support plate (2) is movably inserted with taper head (8), the guide rod (4) on the upper side of support plate (2) is equipped with top plate (3), the guide rod (4) on the top plate (3) upper and lower ends is threadedly connected with limiting nut (9), the bottom of top plate (3) is detachably equipped with positioning column (10), the central axis of taper head (8) coincides with the central axis of positioning column (10).

2. A device for enlarging the diameter of a steel pipe according to claim 1, characterized in that, The support plate (2) is provided with a pin slot (7), and the bottom of the taper head (8) is provided with a plug-in column (11) matched with the pin slot (7).

3. A device for enlarging the diameter of a steel pipe according to claim 2, characterized in that, The bottom of the pin slot (7) is provided with a protruding block (12), the protruding block (12) is in a cross-shaped structure, the bottom of the plug-in column (11) is provided with a recess (13) matched with the protruding block (12), and the recess (13) is movably sleeved on the protruding block (12).

4. A device for enlarging the diameter of a steel pipe according to claim 3, characterized in that, The central axis of the pin slot (7) coincides with the central axis of the support plate (2).

5. A device for enlarging the diameter of a steel pipe according to claim 1, wherein The upper part of the positioning column (10) is in a cylindrical structure, and the lower part of the positioning column (10) is in a conical table structure.

6. A device for enlarging the diameter of a steel pipe according to claim 1, characterized in that, The bottom of the first bottom plate (1) is provided with a height-adjustable support structure, the support structure includes a lead screw (14), a fastening nut (15), and a second bottom plate (16), the lead screw (14) has four, the lead screw (14) is threadedly connected with the first bottom plate (1), and the lead screw (14) is located at the four corners of the first bottom plate (1), the bottom of the lead screw (14) is connected with the second bottom plate (16), the fastening nut (15) is threadedly connected with the lead screw (14) below the first bottom plate (1), and the fastening nut (15) is in contact with the lower end surface of the first bottom plate (1).

7. A device for enlarging the diameter of a steel pipe according to claim 6, characterized in that, The bottom of the second bottom plate (16) is provided with an anti-skid pattern.

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