Expander and three-beam synchronous straightening device thereof
By adding a three-beam synchronous straightening device to the expanding machine, and utilizing a triangular force application structure and hydraulic flexible straightening method, the problem of maintaining the straightness of steel pipes during the expanding process is solved, achieving high-precision synchronous expanding and straightening, and improving the stability of the equipment and the straightness of the steel pipes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNYO S&T CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-03
AI Technical Summary
Existing expanding machines have difficulty maintaining the straightness of steel pipes during the expanding process. This is especially true when expanding small and medium-sized pipes, where the yield strength of different sections of the steel pipe and at the same location in the circumferential direction is uneven, leading to serious bending problems.
A three-beam synchronous straightening device is added to the expanding machine. Through the telescopic straightening structure of the circumferential array, including the connecting crossbeam, the straightening crossbeam, the coarse adjustment power source and the fine adjustment power source, the expansion and straightening are carried out simultaneously. The straightness of the steel pipe is ensured by using the triangular force application structure and the hydraulic flexible straightening method.
This method achieves straightness control of steel pipes within 0.1% during the expansion process, reduces straightening steps, improves stability and accuracy, avoids damage caused by rigid impacts in traditional methods, and enhances equipment reliability.
Smart Images
Figure CN224444175U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe diameter expansion and straightening technology, and in particular to a diameter expansion machine and its three-beam synchronous straightening device. Background Technology
[0002] When expanding the diameter of a steel pipe, if the straightness of the pipe is bent, the existing technology usually applies a suitable bending force to the existing curve of the steel pipe to change the curvature of the steel pipe and straighten it.
[0003] The steel pipe clamping system of commercially available pipe expanders changes the clamp height while feeding the steel pipe, causing the pipe to bend and thus achieving a good straightening effect. However, due to the varying quality of the steel plates used to make the pipes, the yield strength in different sections and at the same location along the circumference is uneven, which can also cause the pipe to bend after expansion, especially noticeable when expanding small and medium-sized pipes. Utility Model Content
[0004] In response to the shortcomings of the existing production technology, the applicant provides an expanding machine and its three-beam synchronous straightening device. The three-beam straightening device is added to the expanding machine so that the straightening beams simultaneously straighten the steel pipe while expanding the diameter.
[0005] The technical solution adopted in this utility model is as follows:
[0006] A multi-beam straightening device includes several sets of telescopic straightening structures arranged in a circular array, each set of telescopic straightening structures comprising:
[0007] Connecting crossbeams as installation references.
[0008] The straightening beam is connected to the expansion joint on the connecting beam.
[0009] The coarse adjustment power source is located on the connecting crossbeam.
[0010] The fine-tuning power source is located at the output end of the coarse-tuning power source; the fine-tuning power source drives the straightening beam in reciprocating motion.
[0011] All the straightening beams of the telescopic straightening structure are arranged in a circle.
[0012] As a further improvement to the above technical solution:
[0013] At each end of each set of telescopic straightening structures, there is a coarse adjustment power source and a fine adjustment power source symmetrically arranged.
[0014] Each set of telescopic straightening structures is driven independently, and all telescopic straightening structures operate synchronously.
[0015] The axial length of the straightening beam is greater than the axial length of the connecting beam.
[0016] The straightening beam is a wedge-shaped prism, including a large end face that is pushed by the fine-tuning power source and a small end face that abuts against the outer wall of the tube.
[0017] The coarse adjustment power source includes a lift installed on the connecting beam and a variable frequency motor that drives the lift.
[0018] The fine-tuning power source is a hydraulic cylinder, which is coaxially arranged with the elevator and perpendicular to the straightening beam.
[0019] An expanding machine with a multi-beam straightening device, the expanding machine includes a gantry, and the multi-beam straightening device is mounted on the gantry.
[0020] As a further improvement to the above technical solution:
[0021] The axial length of the straightening beam is less than or equal to the axial length of the gantry.
[0022] The expanding machine has an expanding section, and each straightening beam corresponds to at least one expanding section in the radial direction of the pipe fitting.
[0023] The beneficial effects of this utility model are as follows:
[0024] This invention adds a three-beam straightening device to the pipe expanding machine. The straightening beams can abut against the outer wall of the pipe, ensuring the straightness of the pipe changes synchronously as the pipe diameter increases, and promptly straightening any bent parts. Furthermore, multiple synchronous pipe expanding and straightening processes can be performed on the same machine until the entire length of the pipe is expanded and straightened.
[0025] The advantage of this utility model is that, compared with the conventional method of first expanding the diameter and then straightening, this utility model reduces the process after straightening, sets the straightening step as an action synchronized with the diameter expansion step, and the straightening structure is a triangular force application structure, which is stable, reliable, and has high action accuracy. Compared with the traditional two-beam straightening, it does not require bottom support, and the overall structural stability is more reliable.
[0026] This invention features three straightening beams that pre-contact the outer wall of the pipe before straightening begins. Initially in contact with the pipe's outer wall, they employ a hydraulic flexible straightening method. If the straightening force is momentarily overloaded, the hydraulic pressure provides protection, preventing damage to the mechanism. In contrast, traditional two-beam straightening does not initially contact the steel pipe, relying on mechanical constraints, which can easily lead to rigid impacts. If the straightening force is momentarily overloaded, without protective measures, both the mechanism and the pipe fittings are easily damaged. The straightening beams can be extended and retracted according to the pipe diameter and move in tandem with the expansion process. Positional limitation suppresses lateral bending of the steel pipe during expansion, achieving straightening.
[0027] Using a three-beam straightening device, the straightness of the expanded steel pipe can be controlled within 0.1% of the pipe length, i.e., 1mm / 1000mm. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of this application.
[0029] Figure 2 This is a structural schematic diagram of the concealed gantry in this application.
[0030] Figure 3 This is a schematic diagram of a set of telescopic straightening structures according to this application.
[0031] Figure 4 This is another perspective schematic diagram of a set of telescopic straightening structures of this application.
[0032] Among them: 1. Telescopic straightening structure; 2. Gantry;
[0033] 101. Connecting beam; 102. Straightening beam; 103. Large end face; 104. Small end face; 105. Lifting platform; 106. Variable frequency motor; 107. Hydraulic cylinder. Detailed Implementation
[0034] The specific embodiments of this utility model are described below with reference to the accompanying drawings.
[0035] like Figures 1-4 As shown, the multi-beam straightening device of this embodiment includes several sets of telescopic straightening structures 1 in a circular array, each set of telescopic straightening structures 1 including:
[0036] Connecting beam 101 serves as the installation reference.
[0037] The straightening beam 102 is telescopically connected to the connecting beam 101.
[0038] The coarse adjustment power source is located on the connecting crossbeam 101.
[0039] The fine-tuning power source is located at the output end of the coarse-tuning power source; the fine-tuning power source drives the straightening beam 102 to reciprocate.
[0040] All the straightening beams 102 of the telescopic straightening structure 1 are arranged in a circle.
[0041] At each end of each set of telescopic straightening structure 1, a coarse adjustment power source and a fine adjustment power source are symmetrically arranged.
[0042] Each set of telescopic straightening structures 1 is driven independently, and all telescopic straightening structures 1 operate synchronously.
[0043] The axial length of the straightening beam 102 is greater than the axial length of the connecting beam 101.
[0044] The straightening beam 102 is a wedge-shaped prism, including a large end face 103 that is pushed by the fine-tuning power source and a small end face 104 that abuts against the outer wall of the tube.
[0045] The coarse adjustment power source includes a lift 105 installed on the connecting beam 101 and a variable frequency motor 106 that drives the lift 105.
[0046] The fine-tuning power source uses a hydraulic cylinder 107, which is colinearly arranged with the lifting platform 105 and perpendicular to the straightening beam 102.
[0047] The expanding machine with a multi-beam straightening device in this embodiment includes a gantry 2, and the multi-beam straightening device is installed on the gantry 2.
[0048] The axial length of the straightening beam 102 is less than or equal to the axial length of the gantry 2.
[0049] The expanding machine has an expanding section, and each straightening crossbeam 102 corresponds to at least one expanding section in the radial direction of the pipe fitting.
[0050] The specific structure and working principle of this application are as follows:
[0051] like Figure 1 The diagram shown is a schematic of the overall structure of the machine in this application. The machine is a diameter expander, which has its own diameter expander section, which will not be described in detail here. The key improvement of this application is that several sets of telescopic straightening structures are added to the gantry 2 of the diameter expander, which are used to pressurize and press against the outer wall of the pipe while expanding the diameter, and straighten it at the same time.
[0052] Considering stability during the straightening process, one embodiment of this application employs three sets of telescopic straightening structures to form a stable triangular force-applying structure, i.e., the included angle between any two adjacent sets of telescopic straightening structures is 120°. This structure is stable, reliable, and highly accurate. Compared to traditional two-beam straightening, which requires the use of a bottom support roller from an expanding machine to create a triangular constraint on the steel pipe, placing certain rigidity and precision requirements on the bottom support roller, this application uses three-beam straightening, reducing the need for a bottom support roller.
[0053] like Figure 2 The diagram shows a schematic of the three-beam straightening structure of this application. The expanding machine is hidden in the diagram to show the relative positions of the three sets of telescopic straightening structures. It can be seen from the diagram that the straightening beams 102 of the three sets of telescopic straightening structures all point to the center position and apply a straightening force against the outer wall of the pipe.
[0054] Reference Figure 3 , Figure 4 Taking one set of telescopic straightening structures as an example, its specific structure will be explained.
[0055] Each set of telescopic straightening structures is equipped with a connecting beam 101, which serves as the installation reference for the telescopic straightening structure. Figure 1The connecting beam 101 can be connected by screws or other fasteners, and both ends of the connecting beam 101 can be locked and installed on the gantry 2.
[0056] Mounting plates extend from both ends of the connecting beam 101, and a lifting platform 105 is mounted on the mounting plates. The lifting platform 105 is connected to a variable frequency motor 106, which is equipped with an encoder. The encoder is used for the large-stroke extension and retraction of the beam when different pipe diameters are present. The working principle of the variable frequency motor 106 and the encoder controlling the lifting platform 105 is existing technology and will not be described in detail in this embodiment. A hydraulic cylinder 107 is connected to the output shaft of the lifting platform 105, and a straightening beam 102 is connected to the output shaft of the hydraulic cylinder 107. The straightening beam 102 is a trapezoidal beam, with its small end facing the outer wall of the pipe. The straightening beam 102 is parallel to the connecting beam 101, and its initial state is that it is attached to the connecting beam 101. In order to apply force evenly to the straightening beam 102, power source groups are symmetrically set at both ends of the connecting beam 101, that is, each end is equipped with a lift 105 and a hydraulic cylinder 107.
[0057] It should be noted that a custom hydraulic cylinder 107 is used in this application. All hydraulic cylinders 107 are proportionally synchronized and controlled to accurately control the distance between the straightening beam 102 and the steel pipe wall. When the steel pipe contacts the straightening beam 102 and the bending force is large, the straightening device has a flexible protection function to avoid damage to the components.
[0058] The specific steps for diameter expansion and straightening are as follows:
[0059] Input the specifications of the steel pipe to be produced. In this embodiment, the specifications refer to the pipe diameter. The elevator 105 is driven to run. At this time, the hydraulic cylinder 107 is still in the original position. The straightening beam 102 is driven by the elevator 105 to run to the corresponding working position. At this time, there is still a one-sided radial gap between the straightening beam 102 and the periphery of the pipe. This gap can be arbitrarily set according to the curvature of the pipe. The one-sided radial gap is reserved to ensure that the pipe does not scrape against the straightening beam 102 when it enters the working section of the straightening beam 102.
[0060] When the pipe fitting is fed into the working section of the straightening beam 102, the hydraulic cylinder 107 operates, driving the straightening beam 102 to contact the pipe fitting. At this time, while the expanding machine expands the diameter of the steel pipe, the straightening beam 102 restricts the steel pipe and straightens it.
[0061] After the aforementioned expansion and straightening actions are completed, the hydraulic cylinder 107 drives the straightening beam 102 to quickly return to its original position, and the steel pipe continues to be fed in, starting the second step of expansion and straightening. This cycle is repeated step by step to expand and straighten the steel pipe until the expansion and straightening of the entire length of the steel pipe is completed.
[0062] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.
Claims
1. A three-beam simultaneous straightening device, characterized by: The system includes several sets of scaling and straightening structures (1) of a circular array, each set of scaling and straightening structures (1) including: Connecting beam (101) serves as the installation reference. The straightening beam (102) is telescopically connected to the connecting beam (101). The coarse adjustment power source is located on the connecting crossbeam (101). The fine-tuning power source is located at the output end of the coarse-tuning power source; the fine-tuning power source drives the straightening beam (102) to reciprocate. The straightening beams (102) of all telescopic straightening structures (1) are arranged in a circle.
2. The three-beam simultaneous straightening device of claim 1, wherein: At each end of each set of telescopic straightening structure (1), a set of coarse adjustment power source and a set of fine adjustment power source are symmetrically arranged.
3. The three-beam simultaneous straightening apparatus according to claim 1, wherein: Each set of telescopic straightening structures (1) is driven independently, and all telescopic straightening structures (1) operate synchronously.
4. The triple-beam simultaneous straightening device of claim 1, wherein: The axial length of the straightening beam (102) is greater than the axial length of the connecting beam (101).
5. The triple-beam simultaneous straightening device of claim 1, wherein: The straightening beam (102) is a wedge-shaped prism, including a large end face (103) pushed by the fine-tuning power source and a small end face (104) abutting against the outer wall of the tube.
6. The three-beam synchronous straightening device as described in claim 1, characterized in that: The coarse adjustment power source includes a lift (105) installed on the connecting beam (101) and a variable frequency motor (106) that drives the lift (105).
7. The triple-beam simultaneous straightening device according to claim 6, characterized in that: The fine-tuning power source is a hydraulic cylinder (107), which is colinear with the elevator (105) and perpendicular to the straightening beam (102).
8. A pipe expanding machine with the three-beam simultaneous straightening device according to any one of claims 1 to 7, characterized in that: The expansion machine includes a gantry (2), and a multi-beam straightening device is installed on the gantry (2).
9. The expanding machine of claim 8, wherein: The axial length of the straightening beam (102) is less than or equal to the axial length of the gantry (2).
10. The expanding machine of claim 8, wherein, The expanding machine has an expanding section, and each straightening beam (102) corresponds to at least one expanding section in the radial direction of the pipe fitting.