Steel pipe end expanding device

Abstract

The utility model discloses a steel pipe end expanding device which comprises an installation frame, a telescopic cylinder is fixed to the rear end of the installation frame, and a push disc is installed on a telescopic rod of the telescopic cylinder. A supporting frame is arranged at the front end of the mounting frame, a plurality of fan-shaped modules are arranged at the front end of the supporting frame in a sliding mode, and a circle is defined by the multiple modules; each lever assembly comprises an expanding arm, a rear connecting rod and a front connecting rod, the rear end of each expanding arm is hinged to the first end of the corresponding rear connecting rod, and the second end of each rear connecting rod is hinged to the edge of the push disc. The front end of the expanding arm is hinged to the first end of the front connecting rod, and the second end of the front connecting rod is hinged to the rear side of the module. A plurality of lever assemblies can be synchronously driven by one telescopic cylinder, so that a plurality of modules are synchronously expanded outwards, the structure is simple, the cost is saved, and the operation is convenient and reliable.

Description

Technical Field

[0001] The utility model relates to a steel pipe end diameter expanding device, belonging to the technical field of pipe end diameter expanding. Background Art

[0002] In the production of steel pipes, in order to facilitate the butt welding of steel pipe ends, it is necessary to ensure that the diameter and ovality of the butt pipe ends on both sides of the butt pipe within a certain length range are close to the same, and the tolerance requirements are relatively strict. Therefore, the production process of spiral steel pipes must go through the pipe end trimming process to ensure dimensional accuracy and eliminate internal stress. However, in the actual production of spiral steel pipes, due to the fluctuation of the mechanical properties of the steel plate and the inaccurate estimation of the impact of factors such as springback, the pipe end diameter often exceeds the tolerance.

[0003] A Chinese patent with announcement number CN202143924U discloses a steel pipe end expander, whose working principle is: the pipe end of the steel pipe is sleeved on the module and pressed against the support plate. When the main cylinder moves, the conical block expands, and the conical block drives the fan-shaped block to expand, and the fan-shaped block drives the module to expand. The diameter of the circle formed by the fan-shaped blocks is expanded. After the locking nut locks the conical block, the circle formed by the fan-shaped blocks maintains the expanded diameter. After a period of time, the pipe end of the steel pipe is expanded.

[0004] However, the above patent has the following technical defects: different fan-shaped modules are driven by different cylinders, which may cause cylinder asynchrony and lead to uneven force. In addition, the oil pipelines are complicated and prone to oil leakage due to the drive of multiple cylinders.

[0005] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] In view of the deficiencies in the background technology, the utility model provides a steel pipe end diameter expanding device, which can synchronously drive multiple lever assemblies through a telescopic cylinder to achieve synchronous outward expansion of multiple modules, has a simple structure, saves costs, and is convenient and reliable to operate.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A steel pipe end diameter expansion device comprises a mounting frame, a telescopic cylinder is fixed to the rear end of the mounting frame, and a push plate is installed on the telescopic rod of the telescopic cylinder;

[0009] A support frame is provided at the front end of the mounting frame, and a plurality of fan-shaped modules are slidably provided at the front end of the support frame, and the plurality of modules form a circle;

[0010] It also includes a plurality of lever assemblies, wherein the lever assemblies include an expansion arm, a rear connecting rod and a front connecting rod, wherein the rear end of the expansion arm is hinged to the first end of the rear connecting rod, and the second end of the rear connecting rod is hinged to the edge of the push plate;

[0011] The front end of the expansion arm is hinged to the first end of the front connecting rod, and the second end of the front connecting rod is hinged to the rear side of the module.

[0012] Furthermore, a plurality of base plates are provided on the front side of the support frame, the base plates correspond to the modules one by one, the modules are fixed to the outer side of the base plates, the second end of the front connecting rod of the lever assembly is connected to the rear side of the base plate, and the lever assembly drives the module to slide by prying the base plate.

[0013] Furthermore, a slide rail is provided between each base plate and the support frame, so that the module on the base plate can slide freely on the support frame.

[0014] Furthermore, the module is of split design and is assembled from a plurality of fan-shaped blocks.

[0015] Furthermore, there are multiple groups of lever assemblies, and the lever assemblies are arranged in a one-to-one correspondence with the modules.

[0016] The invention is characterized in that: a plurality of mounting holes are arranged on the back side of the supporting frame, and the middle front position of the expansion arm is hinged to the mounting holes.

[0017] Furthermore, the mounting frame and the support frame are fixedly connected via a connecting sleeve, the push plate is arranged inside the connecting sleeve, the expansion arm is arranged outside the connecting sleeve, a plurality of avoidance holes are arranged around the connecting sleeve, and the rear connecting rod passes through the avoidance holes and is hinged to the push plate in the connecting sleeve.

[0018] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0019] 1. The push plate pulls the rear end of the expansion arm toward the push plate through the rear connecting rod, and the expansion arm rotates around the mounting hole, so that the front end of the expansion arm pulls the front connecting rod to move outward, thereby synchronously driving all modules to expand outward, so that the end of the steel pipe can be expanded. Only one telescopic cylinder is needed to drive all modules to move synchronously, so that the force on the steel pipe is balanced; at the same time, the structure is simple, cost-saving, and the operation is convenient and reliable.

[0020] 2. The module is of split design and is assembled from a plurality of fan-shaped blocks. By replacing the fan-shaped blocks, modules of different sizes can be formed to adapt to steel pipes of different inner diameters.

[0021] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a three-dimensional structural schematic diagram of the utility model;

[0023] Figure 2 It is a front view of the utility model;

[0024] Figure 3 yes Figure 2 Right view of;

[0025] Figure 4 yes Figure 3 Sectional view along AA;

[0026] Figure 5 It is a structural schematic diagram of the module in the utility model;

[0027] Figure 6 It is a structural schematic diagram of the support frame in the utility model;

[0028] Figure 7 It is a structural schematic diagram of a connecting sleeve in the utility model.

[0029] In the figure,

[0030] 1-frame, 2-mounting frame, 3-telescopic cylinder, 4-support frame, 401-mounting hole, 5-expansion arm, 6-rear connecting rod, 7-connecting sleeve, 701-avoidance hole, 8-front connecting rod, 9-push plate, 10-module, 11-base plate, 12-slide rail. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0032] like Figure 1-4 As shown, the utility model provides a steel pipe end diameter expanding device, comprising a mounting frame 2, a telescopic cylinder 3 is fixed to the rear end of the mounting frame 2, and a push plate 9 is installed on the telescopic rod of the telescopic cylinder 3.

[0033] The front end of the mounting frame 2 is provided with a support frame 4 (such as Figure 6 ), the mounting frame 2 is fixedly connected to the support frame 4 through a connecting sleeve 7, such as Figure 4 , Figure 7 shown.

[0034] The front end of the support frame 4 is slidably provided with a plurality of fan-shaped modules 10 (such as Figure 5 ), multiple modules 10 are arranged in a circle. A frame 1 is provided at the lower end of the mounting frame 2 for supporting the entire device.

[0035] The utility model also includes a plurality of groups of lever assemblies arranged in a circle, wherein the lever assemblies are arranged in one-to-one correspondence with the modules 10, one end of the lever assembly is connected to the push plate 9, and the other end is connected to the module 10, the telescopic cylinder 3 pushes the push plate 9 to move forward, and through the action of the lever assembly, the module 10 is pried to slide to the outside away from the center of the circle.

[0036] In some embodiments, a plurality of base plates 11 are provided on the front side of the support frame 4, and the base plates 11 correspond one-to-one to the modules 10. The modules 10 are fixed to the outer side of the base plates 11, and the lever assembly is connected to the rear side of the base plates 11. The lever assembly drives the modules 10 to slide by prying the base plates 11 to slide.

[0037] A slide rail 12 is provided between each base plate 11 and the support frame 4 , so that the module 10 can slide freely on the base plate 11 and the support frame 4 .

[0038] The module 10 is of split design and is assembled from a plurality of sector blocks. Modules 10 of different sizes can be formed by replacing the sector blocks to adapt to steel pipes of different inner diameters.

[0039] The lever assembly includes an expansion arm 5, a rear connecting rod 6 and a front connecting rod 8. A plurality of mounting holes 401 are provided on the back side of the support frame 4. The expansion arm 5 is hinged to the mounting hole 401 at the middle front position. The rear end of the expansion arm 5 is hinged to the first end of the rear connecting rod 6, and the second end of the rear connecting rod 6 is hinged to the edge of the push plate 9.

[0040] The push plate 9 is arranged inside the connecting sleeve 7 , and the expansion arm 5 is arranged outside the connecting sleeve 7 . A plurality of avoidance holes 701 are arranged around the connecting sleeve 7 , and the rear connecting rod 6 passes through the avoidance holes 701 and is hinged to the push plate 9 in the connecting sleeve 7 .

[0041] The front end of the expansion arm 5 is hinged to the first end of the front connecting rod 8 , and the second end of the front connecting rod 8 is hinged to the rear side of the bottom plate 11 .

[0042] The push plate 9 is disc-shaped, and its edge is hinged with the second end of the rear connecting rod 6 in the multiple lever assemblies, so that the multiple rear connecting rods 6 are evenly distributed in a circle of the push plate 9. When the steel pipe needs to be expanded, one end of the steel pipe is sleeved on the outside of the module 10, and the end of the steel pipe is against the front surface of the support frame 4, and then the telescopic cylinder 3 pushes the push plate 9 to move forward. The push plate 9 pulls the rear end of the expansion arm 5 to move closer to the push plate 9 through the rear connecting rod 6. The expansion arm 5 rotates around the mounting hole 401, so that the front end of the expansion arm 5 pulls the front connecting rod 8 to move outward, so that all modules 10 can be synchronously driven to expand outward, so that the end of the steel pipe can be expanded. This structure only needs one telescopic cylinder to drive all modules to act synchronously, with a simple structure, cost saving, and convenient and reliable operation.

[0043] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A steel pipe end diameter expansion device, characterized in that: It comprises a mounting frame (2), a telescopic cylinder (3) is fixed to the rear end of the mounting frame (2), and a push plate (9) is installed on the telescopic rod of the telescopic cylinder (3); A support frame (4) is provided at the front end of the mounting frame (2), and a plurality of fan-shaped modules (10) are slidably provided at the front end of the support frame (4), and the plurality of modules (10) form a circle; It also includes a plurality of lever assemblies, wherein the lever assemblies include an expansion arm (5), a rear connecting rod (6) and a front connecting rod (8), wherein the rear end of the expansion arm (5) and the first end of the rear connecting rod (6) are hinged to each other, and the second end of the rear connecting rod (6) is hinged to the edge of the push plate (9); The front end of the expansion arm (5) is hinged to the first end of the front connecting rod (8), and the second end of the front connecting rod (8) is hinged to the rear side of the module (10).

2. A steel pipe end diameter expanding device as claimed in claim 1, characterized in that: A plurality of bottom plates (11) are provided on the front side of the support frame (4), the bottom plates (11) correspond to the modules (10) one by one, the modules (10) are fixed to the outer side of the bottom plates (11), the second end of the front connecting rod (8) of the lever assembly is connected to the rear side of the bottom plate (11), and the lever assembly drives the modules (10) to slide by prying the bottom plate (11).

3. A steel pipe end diameter expanding device as claimed in claim 2, characterized in that: A slide rail (12) is provided between each base plate (11) and the support frame (4), so that the module (10) on the base plate (11) can slide freely on the support frame (4).

4. A steel pipe end diameter expanding device as claimed in claim 1, characterized in that: The module (10) is of split design and is assembled from a plurality of sector blocks.

5. A steel pipe end diameter expanding device as claimed in claim 2, characterized in that: There are multiple groups of lever assemblies, and the lever assemblies are arranged in a one-to-one correspondence with the modules (10).

6. A steel pipe end diameter expanding device as claimed in claim 2, characterized in that: A plurality of mounting holes (401) are provided on the back side of the support frame (4), and the middle front position of the expansion arm (5) is hinged to the mounting hole (401).

7. A steel pipe end diameter expanding device as claimed in claim 5, characterized in that: The mounting frame (2) and the support frame (4) are fixedly connected via a connecting sleeve (7); a push plate (9) is arranged inside the connecting sleeve (7); an expansion arm (5) is arranged outside the connecting sleeve (7); a plurality of avoidance holes (701) are arranged around the connecting sleeve (7); a rear connecting rod (6) passes through the avoidance holes (701) and is hingedly connected to the push plate (9) in the connecting sleeve (7).

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