Cold-bending machine for steel pipes

Abstract

The application provides a cold bending machine for steel pipes, which comprises a tension bending unit, wherein the tension bending unit comprises oppositely arranged support plates, the outer sides of the support plates can be matched with the inner wall of the pipe to be bent, a telescopic tension mechanism is arranged between the support plates, the telescopic tension mechanism can realize that the support plates are tightly attached to the inner wall of the pipe to be bent or separated from the inner wall of the pipe to be bent during the telescopic process, the side of the support plate is provided with a telescopic pushing mechanism, the telescopic pushing mechanism can be extended to apply a pushing force to the inner wall of the pipe to be bent when the support plate is tightly attached to the inner wall of the pipe to be bent, and the tension bending units can be connected in series to form a cylindrical assembly. The cold bending machine provided by the application can apply an external force to the pipe material from the inside of the pipe material to make the pipe material plastically deform and reach the angle used in construction.

Description

Technical Field

[0001] This invention relates to the field of cold bending construction technology for long-distance pipelines, specifically to a cold bending machine for steel pipelines. Background Technology

[0002] Currently, the mainstream equipment for cold-bending pipe manufacturing is the vertical hydraulic cold-bending machine. Its basic working principle is to apply bending moment through appropriate fulcrums and stress points, causing plastic deformation of the steel pipe, thereby achieving the purpose of cold bending. Vertical hydraulic cold-bending machines (such as...) Figure 1 The structural types (as shown) include integral, main unit and power unit separate, and modular types. Components include frame assembly, power system, hydraulic system, upper die, lower die, inner tube, clamps, hoisting mechanism, self-unloading device, measuring and display system, and traction and walking device. Major foreign manufacturers of cold bending machines include CRC (USA), Universal (USA), and Gree (Italy). Their cold bending machines have a maximum bending capacity of 1422mm outer diameter and 42mm wall thickness (X80 steel grade), employing either integral or main unit and power unit separate structural designs, with the overall machine weight controlled between 75 and 95 tons. Large vertical hydraulic cold bending machines have the disadvantages of large footprint, difficult transportation, low working efficiency, and complex structure, making them prone to hydraulic and mechanical failures.

[0003] Furthermore, vertical hydraulic cold bending machines have the following disadvantages: construction with thin-walled, thick-walled pipes is more difficult, and the ripple height is easily exceeded; the number of bends and the lifting angle must be calculated before construction, placing high demands on the operator and resulting in high labor intensity; the bending angle of the pipe needs to be repeatedly checked, making it disadvantageous in terms of construction difficulty and time; it can only process 3PE pipes and plain pipes, and cannot process pipes with insulation layers. Figure 2 As shown, place a steel ruler horizontally on two adjacent wave crests, with the steel ruler in contact with the two wave crests. Use a feeler gauge to measure the distance from the vertical steel ruler to the wave trough, which is the wave height h. Place the steel ruler horizontally on two adjacent wave crests, with the steel ruler in contact with the two wave crests. The distance between the contact points is the wave spacing f. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a cold bending machine for steel pipes, which can apply an external force from the inside of the pipe to bend the pipe, thereby causing plastic deformation of the pipe to achieve the angle required for construction.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] The utility model provides a cold bending pipe bender for steel pipe, which comprises a tension bending unit, wherein the tension bending unit comprises oppositely arranged support plates, the outer sides of the support plates can be matched with the inner wall of the pipe to be bent, a telescopic tension mechanism is arranged between the support plates, the telescopic tension mechanism can realize the close contact of the support plates with the inner wall of the pipe to be bent or the separation of the support plates from the inner wall of the pipe to be bent during the telescopic operation, the side portions of the support plates are provided with a telescopic pushing mechanism, the telescopic pushing mechanism can extend out to apply a pushing force to the inner wall of the pipe to be bent when the support plates are in close contact with the inner wall of the pipe to be bent, and the tension bending units can be connected in series to form a cylindrical assembly.

[0007] The cold bending pipe bender for steel pipe according to the utility model applies tension and bending forces inside the steel pipe to be bent, so that the pipe material is continuously plastically deformed to achieve the bending angle of the steel pipe, the cold bending pipe bender is pulled out of the pipe after the bending is completed, and the production of the cold-bent pipe is completed.

[0008] For the above technical solution, further improvements can be made as follows.

[0009] In a preferred embodiment of the cold bending pipe bender for steel pipe according to the utility model, the telescopic tension mechanism comprises a tension cylinder arranged at the center of the support plate, the tension cylinder is connected with a tension mechanism control system through a tension oil circuit, and the tension oil circuits of the tension bending units are connected in parallel.

[0010] The telescopic tension mechanism with the above structure is stable and reliable in structure, easy to arrange and install, and can control the tension process of the pipe to be bent through a hydraulic control system, so that the entire operation process is stable and reliable, the working efficiency is high, and the control oil circuit is simple and reliable.

[0011] Further, in a preferred embodiment, a mounting seat for connecting the tension cylinder is arranged on the inner side of the support plate.

[0012] The tension cylinder is arranged through the mounting seat, and the structure is simple and compact, easy to process and manufacture, and convenient for the telescopic operation of the tension cylinder.

[0013] Specifically, in a preferred embodiment, the telescopic pushing mechanism comprises a bending cylinder, the bending cylinder is connected with a feeding block, and the bending cylinder can drive the feeding block to telescope, the bending cylinder is connected with a pushing mechanism control system through a bending oil circuit, and the bending oil circuits of the tension bending units are connected in parallel.

[0014] The telescopic pushing mechanism with the above structure is stable and reliable in structure, convenient to arrange and install, and capable of controlling the bending process of the pipe to be bent through the hydraulic control system, so that the whole operation process is stable and reliable, the bending efficiency is high, the operation angle and size are accurate, and the control oil circuit is simple and reliable.

[0015] Further, in a preferred embodiment, an ear seat extending outward along a direction parallel to the axis is arranged on the inner side of one support plate, and a mounting table is arranged on both sides of the other support plate correspondingly, and the two ends of the bending oil cylinder are connected with the ear seat and the mounting table respectively, and the feeding block is located outside the mounting table.

[0016] The bending oil cylinder is arranged through the ear seat hinge and the mounting table, so that the mounting structure of the bending oil cylinder is simple and compact, and easy to operate, thereby making the whole tension bending unit simple and compact in structure, and easy to process and manufacture.

[0017] Specifically, in a preferred embodiment, the feeding block is a wedge-shaped block structure with a narrow top and a wide bottom.

[0018] The wedge-shaped block structure of the feeding block facilitates the cooperation with the inner wall of the pipe to be bent to complete the feeding during the pushing process.

[0019] Further, in a preferred embodiment, a rounded corner structure is arranged on the top of the feeding block.

[0020] The rounded corner structure arranged on the top of the feeding block can effectively avoid damaging the inner wall of the pipe to be bent during the pushing process.

[0021] Further, in a preferred embodiment, a roller structure is arranged on the support plate in a uniform and spaced manner along the circumferential direction.

[0022] The roller structure arranged on the support plate facilitates the guidance of the pipe bender when entering the inside of the pipe to be bent, and can reduce the friction between the support plate and the inner wall of the pipe to be bent, so that the pipe bender enters the pipe to be bent more easily.

[0023] Specifically, in a preferred embodiment, a return pull lock and a connecting pair are arranged on both sides of the support plate correspondingly, and the adjacent two tension bending units are connected with each other through the return pull lock and the connecting pair.

[0024] The plurality of tension bending units are connected into a cylindrical whole through the return pull lock, the connecting pair and the pin shaft, and the whole assembly structure is simple and convenient to operate and drag.

[0025] Further, in a preferred embodiment, a reinforcing rib structure is arranged on the inner side of the support plate.

[0026] Through the reinforcing rib structure, the structural strength of the supporting plate can be effectively increased, so as to improve the reliability of the whole pipe bending machine.

[0027] Compared with the prior art, the application has the advantages that the pipe is subjected to plastic deformation by applying external force to bend the pipe from the inside of the pipe, so as to reach the angle used in construction. BRIEF DESCRIPTION OF DRAWINGS

[0028] Hereinafter, the application will be described in more detail based on the embodiments and with reference to the drawings. In the drawings:

[0029] Figure 1 The overall structure of the vertical hydraulic cold bending machine is schematically shown;

[0030] Figure 2 The wave height and wave spacing are schematically shown;

[0031] Figure 3 The initial state of the cold bending pipe machine according to the embodiment of the application is schematically shown;

[0032] Figure 4 The working state of the cold bending pipe machine according to the embodiment of the application is schematically shown;

[0033] Figure 5 The overall structure of the tension bending unit according to the embodiment of the application is schematically shown;

[0034] Figure 6 The overall structure of the tension bending unit according to the embodiment of the application in another direction is schematically shown;

[0035] Figure 7 The overall structure of the tension bending unit according to the embodiment of the application in another direction is schematically shown;

[0036] Figure 8 The overall structure of the tension bending unit according to the embodiment of the application in another direction is schematically shown;

[0037] Figure 9 The partial enlarged structure of the cold bending pipe machine according to the embodiment of the application is schematically shown.

[0038] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0039] The application will be further described in detail below in combination with the drawings and specific embodiments, but the protection scope of the application is not limited by this.

[0040] Figure 3 The initial state of the cold bending pipe machine 100 according to the embodiment of the application is schematically shown. Figure 4The working state of the cold bending pipe bender 100 of the embodiment of the present application is schematically shown. Figure 5 The overall structure of the tension bending unit 10 of the embodiment of the present application is schematically shown. Figure 6 The overall structure of the tension bending unit 10 of the embodiment of the present application in another direction is schematically shown. Figure 7 The overall structure of the tension bending unit 10 of the embodiment of the present application in another direction is schematically shown. Figure 8 The overall structure of the tension bending unit of the embodiment of the present application in another direction is schematically shown. Figure 9 The partial enlarged structure of the cold bending pipe bender 100 of the embodiment of the present application is schematically shown.

[0041] As Figures 1 to 9 shown, the cold bending pipe bender 100 for steel pipes of the embodiment of the present application comprises a tension bending unit 10, wherein the tension bending unit 10 comprises oppositely arranged support plates 1, and the outer side of the support plates 1 can form cooperation with the inner wall of the pipe to be bent, a telescopic tension mechanism 2 is arranged between the support plates 1, the telescopic tension mechanism can realize that the support plates 1 are tightly attached to or separated from the inner wall of the pipe to be bent during the telescopic process, a telescopic pushing mechanism 3 is arranged at the side of the support plates 1, the telescopic pushing mechanism 3 can extend out to apply a pushing force to the inner wall of the pipe to be bent when the support plates 1 are tightly attached to the inner wall of the pipe to be bent, and the tension bending units 10 can be connected in series to form a cylindrical assembly.

[0042] According to the cold bending pipe bender for steel pipes of the embodiment of the present application, an integral design is adopted, the cylindrical assembly as a whole enters the inside of the pipe to be bent in a dragging manner, after the position in the pipe to be bent is adjusted, the tension control module is opened to tightly attach and tension the whole cylindrical assembly to the inner wall of the pipe to be bent, then the telescopic pushing mechanism is opened to perform pipe bending after the angle is adjusted by the angle control device. Therefore, according to the cold bending pipe bender of the present application, the overall structure is simple, which greatly guarantees the stability of the equipment work; the equipment is light and easy to transport, can follow the welding construction unit to perform construction, greatly simplifies the construction difficulty, saves a large amount of pipe transportation cost, can reduce the investment of hoisting equipment during construction, saves a large amount of construction equipment cost, can construct various pipes at the same time, the pipe construction quality is high, avoids the construction quality problems such as excessive wave peak and excessive wave length.

[0043] As Figures 5 to 9As shown, in the embodiment, the telescopic tensioning mechanism 2 comprises a tensioning oil cylinder 21 arranged at the center of the support plate 1, the tensioning oil cylinder 21 is connected with the tensioning mechanism control system through a tensioning oil path 22, and the tensioning oil paths 22 of the tensioning bending units 10 are connected in parallel with each other. The telescopic tensioning mechanism with the above structure is stable and reliable in structure, easy to arrange and install, and the tensioning process of the pipe to be bent is controlled by the hydraulic control system, the whole operation process is stable and reliable, the working efficiency is high, and the control oil path is simple and reliable. Further, in the embodiment, the inner side of the support plate 1 is provided with a mounting seat 11 for connecting the tensioning oil cylinder 21. By arranging the tensioning oil cylinder through the mounting seat, the structure is simple and compact, easy to process and manufacture, and the tensioning oil cylinder can be easily operated.

[0044] As shown in Figures 5 to 9 , specifically, in the embodiment, the telescopic pushing mechanism 3 comprises a bending oil cylinder 31, the bending oil cylinder 31 is connected with a feeding block 32, and the bending oil cylinder 31 can drive the feeding block 32 to extend and retract, the bending oil cylinder 31 is connected with the pushing mechanism control system through a bending oil path 33, and the bending oil paths 33 of the tensioning bending units are connected in parallel with each other. The telescopic pushing mechanism with the above structure is stable and reliable in structure, easy to arrange and install, and the bending process of the pipe to be bent is controlled by the hydraulic control system, the whole operation process is stable and reliable, the bending efficiency is high, the operation angle and size are accurate, and the control oil path is simple and reliable. Further, in the embodiment, the inner side of one of the support plates 1 is provided with an ear seat 12 extending outward along the direction parallel to the axis, the other support plate 1 is provided with a mounting table 13 on both sides correspondingly, the two ends of the bending oil cylinder 31 are connected with the ear seat 12 and the mounting table 13 respectively, and the feeding block 32 is located outside the mounting table 13. By arranging the bending oil cylinder through the ear seat and the mounting table, the installation structure of the bending oil cylinder can be effectively ensured to be simple and compact, easy to operate, so that the whole tensioning bending unit is simple and compact in structure, easy to process and manufacture, and the pushing mechanism can be symmetrically arranged on both sides of the tensioning mechanism for pushing, which can effectively ensure that the inner wall of the pipe to be bent is uniform, and greatly ensure the bending quality.

[0045] As shown in Figure 5 , Figure 7 and Figure 8 , specifically, in the embodiment, the feeding block 32 is a wedge-shaped block structure with a narrow top and a wide bottom. The wedge-shaped block structure of the feeding block is convenient for cooperating with the inner wall of the pipe to be bent to complete the feeding during the pushing process. Further, in the embodiment, the top of the feeding block 32 is provided with a rounded corner structure. By providing the rounded corner structure on the top of the feeding block, damage to the inner wall of the pipe to be bent during the pushing process of the feeding block can be effectively avoided.

[0046] Further, in the embodiment, the support plate 1 is provided with roller structures 4 arranged uniformly and spaced apart in the circumferential direction. By providing the roller structures on the support plate, the whole pipe bending machine can be guided when entering the inside of the pipe to be bent, and the friction between the support plate and the inner wall of the pipe to be bent can be reduced, so that the whole pipe bending machine enters the pipe to be bent more easily.

[0047] As shown in Figures 5 to 8 particular, in the embodiment, the support plate 1 is respectively provided with a reset zipper 5 and a connecting pair 6 on both sides, and adjacent two tension bending units are connected with each other through the reset zipper, the connecting pair and a pin shaft. The plurality of tension bending units are connected into a cylindrical whole through the reset zipper, the connecting pair and the pin shaft, and the whole assembly structure is simple, which is convenient for operation and dragging.

[0048] As shown in Figure 5 Further, in the embodiment, the inner side of the support plate 1 is provided with a reinforcing rib structure 14. By providing the reinforcing rib structure, the structural strength of the support plate can be effectively increased, so as to improve the reliability of the whole pipe bending machine.

[0049] According to the above embodiment, it can be seen that the cold bending pipe bending machine for steel pipes according to the present application can apply an external force to the pipe material from the inside of the pipe material to make the pipe material bend and deform plastically, so as to reach the angle used in construction.

[0050] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cold bending machine for steel pipes, characterized in that, The cold bending machine for steel pipe comprises a plurality of tension bending units, wherein The tension bending unit comprises oppositely arranged support plates, and the outer side of the support plate can form a fit with the inner wall of the pipe to be bent. A telescopic tension mechanism is arranged between the support plates, and the telescopic tension mechanism can realize the adhesion or separation of the support plates to the inner wall of the pipe to be bent during the telescopic process. The side of the support plate is provided with a telescopic pushing mechanism, which can extend out to apply a pushing force to the inner wall of the pipe to be bent when the support plate adheres to the inner wall of the pipe to be bent. A plurality of the tension bending units can be connected in series to form a cylindrical assembly. The support plate is provided with a roller structure uniformly arranged in the circumferential direction. The inner side of the support plate is provided with a reinforcing rib structure.

2. The cold bending machine for steel pipe according to claim 1, wherein The telescopic tension mechanism comprises a tension cylinder arranged at the center of the support plate, and the tension cylinder is connected with a tension mechanism control system through a tension oil circuit, and the tension oil circuits of a plurality of the tension bending units are connected in parallel.

3. The cold-bending machine for steel pipes according to claim 2, characterized in that, The inner side of the support plate is provided with a mounting seat for connecting the tension cylinder.

4. The cold bending machine for steel pipe according to any one of claims 1 to 3, wherein The telescopic pushing mechanism comprises a bending cylinder connected with a feeding block, and the bending cylinder can drive the feeding block to extend and retract. The bending cylinder is connected with a pushing mechanism control system through a bending oil circuit, and the bending oil circuits of a plurality of the tension bending units are connected in parallel.

5. The cold-bending machine for steel pipes according to claim 4, characterized in that, The inner side of one of the support plates is provided with an ear seat extending outward in the direction parallel to the axis, and the other side of the support plate is provided with a mounting table corresponding to the ear seat, and the two ends of the bending cylinder are connected with the ear seat and the mounting table respectively, and the feeding block is located outside the mounting table.

6. The cold-bending machine for steel pipes according to claim 4, characterized in that, The feeding block is a wedge-shaped block structure with a narrow top and a wide bottom.

7. The cold-bending machine for steel pipes according to claim 6, characterized in that, The top of the feeding block is provided with a rounded corner structure.

8. The cold-bending machine for steel pipes according to any one of claims 1 to 3, characterized in that, The two sides of the support plate are respectively provided with a return pull lock and a connecting pair, and adjacent two tension bending units are connected with each other through the return pull lock and the connecting pair.

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