Straightening equipment and straightening method for welded pipe

Abstract

The invention discloses welding pipe straightening equipment, relates to the technical field of welding pipe straightening, and adopts the technical scheme that the welding pipe straightening equipment comprises a movable rack; the pre-straightening roller group and the fine straightening roller group are arranged on the rack for straightening and conveying the welded pipe; the heating device is arranged between the pre-straightening roller set and the fine straightening roller set and can heat the welded pipe; the detection device is arranged on the rack and is used for detecting the bending degree of the pre-straightening welded pipe; and the cooling device is arranged on the rack and can cool the welded pipe. The invention further provides a welded pipe straightening method. According to the technical scheme, the bending degree of the pre-straightened welded pipe is detected in real time, the detection device can accurately capture specific parameters of bending of the welded pipe and feed the parameters back to the control system, the working state of the heating device is automatically adjusted, the welded pipe is quickly straightened, and the device can be suitable for the welded pipes with different diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of welded pipe straightening, and more particularly to a welded pipe straightening device and a straightening method. Background Art

[0002] After the welded pipe is prepared and processed or during use, it is inevitable that the pipe will bend and deform, and a straightening machine is needed to straighten its surface flatness. The common straightening machine principle is to squeeze the metal pipe through two straightening rollers to achieve the effect of straightening the steel pipe. However, a single mechanical straightening method is usually suitable for plate structures with low rigidity and not too thick or welded pipes with small diameter and short length. For welded pipes with thicker walls and larger diameters, a single mechanical straightening method is not applicable or has low efficiency. Summary of the invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a straightening device and a straightening method for welded pipes.

[0004] To achieve the above object, the present invention provides the following technical solution: a welded pipe straightening device, characterized in that it comprises:

[0005] A movable frame 1, a pre-straightening roller set 2, a fine straightening roller set 3, a first drive motor 6, a second drive motor 7, a heating device 4, a cooling device 5 and a detection device 8;

[0006] The movable frame 1 includes a workbench 101, a bracket 102, and a roller 103;

[0007] The pre-straightening roller group 2 is arranged on the workbench 101 to straighten and transport the welded pipe, and includes an upper roller 201 of the pre-straightening group, a lower roller 202 of the pre-straightening group, a first adjustable hand wheel 203 and a first tension spring 204;

[0008] The fine straightening roller group 3 is arranged on the workbench 101 to straighten and transport the welded pipe, and includes an upper roller wheel 301 of the fine straightening group, a lower roller wheel 302 of the fine straightening group, a second adjustable hand wheel and a second tension spring;

[0009] The first driving motor 6 is fixed on the pre-straightening roller group 2 and is transmission-connected to the pre-straightening roller group;

[0010] The second driving motor 7 is fixed on the fine straightening roller group 3 and is drivingly connected to the fine straightening roller group;

[0011] The heating device 4 comprises a medium frequency induction coil 401 and an adjustable power supply 402. The heating device 4 is arranged on the workbench 101, between the pre-straightening roller set 2 and the fine straightening roller set 3, and can heat the welded pipe;

[0012] The detection device 8 includes a hollow rotating platform 801 , a laser displacement sensor 802 and a servo motor 803 .

[0013] Preferably, the cooling device 5 includes a splash-proof water trough 501, a water diversion pipe 502, a water distribution chamber 503, a water spray gun 504 and a water inlet hole 505, wherein the splash-proof water trough 501 is arranged above the workbench 101, the water diversion pipe 502 is arranged below the splash-proof water trough 501, the water distribution chamber 503 and the water spray gun 504 are arranged in the splash-proof water trough 501, and the water inlet hole 505 is arranged on the water distribution chamber 503.

[0014] Preferably, the pre-straightening roller set 2 and the fine straightening roller set 3 have the same structure;

[0015] The pre-straightening roller set 2 and the fine straightening roller set 3 include multiple pairs of upper and lower rollers;

[0016] The first adjustable hand wheel bearing in the pre-straightening roller set 2 is provided with a spacing scale;

[0017] The second adjustable hand wheel bearing in the fine straightening roller set 3 is provided with a spacing scale;

[0018] The first adjustable hand wheel in the pre-straightening roller set 2 can control the roller distance between the upper roller and the lower roller;

[0019] The second adjustable hand wheel in the fine straightening roller group 3 can control the roller distance between the upper roller and the lower roller;

[0020] The straightening roller groups are arranged on the same straight line.

[0021] Preferably, the upper roller 201 of the pre-straightening roller group 2 is transmission-connected to the first drive motor 6;

[0022] The upper roller 301 of the fine straightening roller group 3 is transmission-connected to the second driving motor;

[0023] The first drive motor 6 and the second drive motor 7 are AC motors, and the power supply is an AC power supply.

[0024] Preferably, the adjustable power supply 402 of the heating device 4 can adjust the heating power according to the wall thickness of the welded pipe.

[0025] Preferably, the water spray gun 504 of the cooling device 5 has six water outlets;

[0026] The water distribution tank 503 of the cooling device 5 has a two-way water inlet hole.

[0027] A welded pipe straightening method according to the present invention comprises the following steps:

[0028] S1: According to the diameter of the welded pipe to be straightened, the first adjustable hand wheel in the pre-straightening roller group is turned to match the spacing between the upper and lower rollers, and the second adjustable hand wheel in the fine straightening roller group is turned to match the spacing between the upper and lower rollers;

[0029] S2: Adjust the required heating power according to the wall thickness of the welded pipe to be straightened and calculate the heating time;

[0030] S3: The pre-straightened welded pipe is transported to the testing device to test whether its curvature is qualified;

[0031] S4: If the curvature of the welded pipe after pre-straightening is unqualified, it is transported to the medium frequency induction coil for heating; if the curvature of the welded pipe after pre-straightening is qualified, the power supply of the heating device is turned off and the welded pipe is not heated;

[0032] S5: The welded pipe after passing through the heating device is transferred to the fine straightening roller group to complete the straightening. Compared with the prior art, the present invention has the following beneficial effects.

[0033] 1. The present invention heats the welded pipe by setting a medium-frequency induction coil, which can achieve local uniform temperature rise of the welded pipe and change the stress distribution of the internal structure of the welded pipe. It is particularly suitable for straightening low-carbon steel welded pipes and some low-alloy structural steel welded pipes, avoiding problems such as uneven heating or overburning of the welded pipe surface that may be caused by traditional heating methods, thereby improving the straightening effect and reducing processing defects.

[0034] 2. The present invention adjusts the power of the heating device and flexibly sets the appropriate heating intensity according to the different requirements of the wall thickness of the welded pipe. For thinner-walled welded pipes, the power can be reduced to avoid excessive heating; for thicker-walled welded pipes, the power can be increased to ensure that the heating penetrates into the interior, thereby effectively eliminating the bending stress caused by the difference in wall thickness of the welded pipe and ensuring the straightening effect of welded pipes with different wall thicknesses.

[0035] 3. The present invention is capable of flexibly adjusting the roller spacing between the upper and lower rollers by setting an adjustable hand wheel for the straightening roller group. The user can quickly adjust the roller spacing to adapt to welded pipes of different specifications according to the diameter of the welded pipe, thereby achieving precise straightening. The hand wheel adjustment device is simple in design and easy to operate, which not only improves the adaptability of the equipment, but also reduces the debugging time when straightening welded pipes of various specifications, thereby improving production efficiency.

[0036] 4. The present invention provides an online detection device to detect the curvature of the pre-straightened welded pipe in real time. The detection device can accurately capture the specific parameters of the welded pipe bending and feed back to the control system to automatically adjust the working state of the heating device to ensure that the straightening process is always carried out under the best working conditions. At the same time, the detection device can also effectively avoid energy waste caused by excessive heating, significantly save energy costs and improve overall economic benefits on the basis of achieving efficient straightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 It is the overall structural diagram of the welded pipe straightening equipment;

[0039] Figure 2 It is a schematic diagram of the movable rack structure;

[0040] Figure 3 It is a schematic diagram of the structure of the pre-straightening group and the driving motor;

[0041] Figure 4 This is a schematic diagram of the structure of the fine straightening group and the driving motor;

[0042] Figure 5 It is a schematic diagram of the heating device structure;

[0043] Figure 6 It is a schematic diagram of the cooling device structure;

[0044] Figure 7 It is a schematic diagram of the detection device structure.

[0045] In the figure: 1. movable frame; 2. pre-straightening group; 3. fine straightening group; 4. heating device; 5. cooling device; 6. first drive motor; 7. second drive motor; 101. workbench; 102. bracket; 103. roller; 201. upper roller of pre-straightening group; 202. lower roller of pre-straightening group; 203. adjustable hand wheel; 204. tightening spring; 301. upper roller of fine straightening group; 302. lower roller of fine straightening group; 401. medium frequency induction coil; 402. adjustable power supply; 501. splashproof water tank; 502. water diversion pipe; 503. water distribution tank; 504. water spray gun; 505. water inlet hole; 801. hollow rotating platform; 802. laser displacement sensor; 803. servo motor. DETAILED DESCRIPTION

[0046] In order to solve the problems described in the background technology, the embodiments of the present invention provide a straightening device and a straightening method for welded pipes. The technical scheme in the embodiments of the present invention will be described clearly and completely in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1-6This embodiment provides a straightening device and a straightening method for a welded pipe, comprising:

[0048] The movable frame 1 provides an installation environment for the welded pipe straightening device and is convenient for mobile use;

[0049] The movable frame 1 is provided with a workbench 101, on which various components required for straightening are installed; a bracket 102, which supports the workbench; and rollers 103, which facilitate the transport and movement of the frame;

[0050] Specifically, the pre-straightening roller group includes six upper rollers, six lower rollers, six first adjustable handles and six first tensioning springs; the lower roller is fixed on the pre-straightening roller group bearing, the upper roller is installed on the first tensioning spring 204, and the first adjustable handle bearing is pressed down on the upper roller; the first adjustable handle bearing is engraved with a spacing value, which can be adjusted by turning the hand wheel according to the diameter of the welded pipe to be straightened, so as to adapt to the pre-straightening of welded pipes with different diameters; the pre-straightening roller group is set on a workbench to complete the pre-straightening of welded pipes that need to be straightened, especially welded pipes with larger curvature, so that the pre-straightened welded pipes can enter the medium frequency induction coil without contact.

[0051] The heating device 4 includes a medium frequency induction coil 401 and an adjustable power supply 402 disposed between the pre-straightening roller group 2 and the fine straightening roller group 3. Specifically, the adjustable power supply 402 is disposed below the workbench, and the medium frequency induction coil 401 is disposed above the workbench. By adjusting the output power of the power supply, the welded pipes with different wall thicknesses are heated to the temperature required for straightening the welded pipes.

[0052] Specifically, the fine straightening group includes six upper rollers, six lower rollers, six second adjustable handles and six second tension springs, which are consistent with the structure of the pre-straightening roller group; the lower roller is fixed on the outer shell of the fine straightening roller group, the upper roller is installed on the second tension spring, and the second adjustable handle bearing is pressed down on the upper roller; the second adjustable handle bearing is engraved with a spacing value, which can be adjusted by turning the hand wheel according to the diameter of the welded pipe to be straightened, so as to adapt to the fine straightening of welded pipes with different diameters; the fine straightening roller group is set on a workbench, and the heated welded pipe is transported to the cooling device after straightening;

[0053] The cooling device 5 comprises a splash-proof water tank 501, a water diversion pipe 502, a water distribution chamber 503, a water spray gun 504 and a water inlet 505, wherein the splash-proof water tank 501 is arranged above the rack workbench 101, the water diversion pipe 502 is arranged below the splash-proof water tank 501, the water distribution chamber 503 and the water spray gun 504 are arranged in the splash-proof water tank 501, and the water inlet 505 is arranged on the water diversion chamber 503; the water spray gun 504 is uniformly surrounded by the passing welded pipe, and water enters the water distribution chamber 503 through the water inlet 505 and is sprayed out through the water spray gun 504, thereby achieving the purpose of cooling the welded pipe; the splash-proof water tank 501 is higher than the upper end plane of the welded pipe, and there is a hole at the bottom of the splash-proof water tank 501, and the water sprayed out of the water spray gun 504 is recovered through the water diversion pipe 502;

[0054] Specifically, the detection device 8 includes a hollow rotating platform 801. The laser displacement sensor 802 arranged on the hollow rotating platform is driven by a servo motor 803. The laser displacement sensor can rotate clockwise or counterclockwise on the hollow rotating platform to detect the curvature of the welded pipe.

[0055] Specifically, the first motor is connected to the upper roller 201 of the pre-straightening roller group through transmission, and the second motor is connected to the upper roller 301 of the fine straightening roller group through transmission, so as to drive the other rollers to move.

[0056] In order to more intuitively disclose the technical solution of the present invention and highlight the beneficial effects of the present invention, the welded pipe straightening device and the straightening method and the working principle are now described in combination with the specific implementation methods. In the specific implementation methods, the specifications, sizes, shapes, and movement modes of the functional components are only listed and should not be regarded as limitations of the technical solution of the present invention.

[0057] The welded pipe straightening method comprises:

[0058] Execute step S1: according to the diameter of the welded pipe to be straightened, rotate the first adjustable hand wheel in the pre-straightening roller group to match the spacing between the upper and lower rollers, and rotate the second adjustable hand wheel in the fine straightening roller group to match the spacing between the upper and lower rollers;

[0059] Execute step S2: turn on the power of the heating device, adjust the required heating power according to the wall thickness of the welded pipe to be straightened, and calculate the heating time;

[0060] Execute step S3: turn on the cooling device, and the water spray gun performs water spraying work normally;

[0061] Execute step S4: turn on the first and second driving motors to drive the roller to rotate;

[0062] Execute step S5: put the welded pipe to be straightened between the upper and lower rollers of the pre-straightening roller group;

[0063] Execute step S6: the pre-straightened welded pipe is transported to the detection device to detect the specific parameters of the bending, and the parameters are fed back to the control system to automatically adjust the heating device;

[0064] Execute step S7: if the curvature of the welded pipe after pre-straightening is unqualified, it is transported to the medium frequency induction coil for heating; if the curvature of the welded pipe after pre-straightening is qualified, the power supply of the heating device is turned off and the welded pipe is not heated;

[0065] Execute step S8: the welded pipe after passing through the heating device is transferred to the fine straightening roller group to complete the straightening;

[0066] Execute step S9: drive the motor to pull the straightened front end of the welded pipe into a cooling device to spray water for cooling.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A welded pipe straightening device, characterized in that: include: A movable frame (1), a pre-straightening roller group (2), a fine straightening roller group (3), a first drive motor (6), a second drive motor (7), a heating device (4), a cooling device (5) and a detection device (8); The movable frame (1) comprises a workbench (101), a bracket (102), and a roller (103); The pre-straightening roller group (2) is arranged on the workbench (101), and comprises an upper roller wheel (201) of the pre-straightening group, a lower roller wheel (202) of the pre-straightening group, a first adjustable hand wheel (203) and a first tensioning spring (204); The fine straightening roller group (3) is arranged on the workbench (101), and comprises an upper roller wheel (301) of the fine straightening group, a lower roller wheel (302) of the fine straightening group, a second adjustable hand wheel and a second tension spring; The first driving motor (6) is fixed on the pre-straightening roller group (2) and is drivingly connected to the pre-straightening roller group; The second driving motor (7) is fixed on the fine straightening roller group (3) and is drivingly connected to the fine straightening roller group; The heating device (4) comprises a medium frequency induction coil (401) and an adjustable power supply (402); the heating device (4) is arranged on the workbench (101) and is located between the pre-straightening roller group (2) and the fine straightening roller group (3); The detection device (8) comprises a hollow rotating platform (801), a laser displacement sensor (802) and a servo motor (803).

2. A welded pipe straightening device according to claim 1, characterized in that: The cooling device (5) comprises a splash-proof water trough (501), a water diversion pipe (502), a water distribution chamber (503), a water spray gun (504) and a water inlet hole (505), wherein the splash-proof water trough (501) is arranged above the workbench (101), the water diversion pipe (502) is arranged below the splash-proof water trough (501), the water distribution chamber (503) and the water spray gun (504) are arranged in the splash-proof water trough (501), and the water inlet hole (505) is arranged on the water distribution chamber (503).

3. The device for straightening welded pipes according to claim 1, characterized in that: The pre-straightening roller set (2) and the fine straightening roller set (3) have the same structure; The pre-straightening roller set (2) and the fine straightening roller set (3) include a plurality of pairs of upper and lower rollers; The first adjustable hand wheel bearing in the pre-straightening roller set (2) is provided with a spacing scale; The second adjustable hand wheel bearing in the fine straightening roller set (3) is provided with a spacing scale; The first adjustable hand wheel in the pre-straightening roller group (2) controls the roller distance between the upper roller and the lower roller; The second adjustable hand wheel in the fine straightening roller group (3) controls the roller distance between the upper roller and the lower roller; The straightening roller groups are arranged on the same straight line.

4. The device for straightening welded pipes according to claim 1, characterized in that: The pre-straightening roller group upper roller (201) of the pre-straightening roller group (2) is transmission-connected to the first drive motor (6); The fine straightening roller group upper roller (301) of the fine straightening roller group (3) is drivingly connected to the second drive motor.

5. The device for straightening welded pipes according to claim 1, characterized in that: The first drive motor (6) and the second drive motor (7) are AC motors, and the power supply is an AC power supply.

6. The welded pipe straightening device according to claim 1, characterized in that: The adjustable power supply (402) of the heating device (4) adjusts the heating power according to the wall thickness of the welded pipe.

7. The welded pipe straightening device according to claim 1, characterized in that: The water spray gun (504) of the cooling device (5) has six water outlets; The water distribution tank (503) of the cooling device (5) has a two-way water inlet hole.

8. A method for straightening a welded pipe, using the device for straightening a welded pipe according to any one of claims 1 to 7, characterized in that: The straightening method comprises the following steps: S1: According to the diameter of the welded pipe to be straightened, the first adjustable hand wheel in the pre-straightening roller group is turned to match the spacing between the upper and lower rollers, and the second adjustable hand wheel in the fine straightening roller group is turned to match the spacing between the upper and lower rollers; S2: Adjust the required heating power according to the wall thickness of the welded pipe to be straightened and calculate the heating time; S3: The pre-straightened welded pipe is transported to the testing device to test whether its curvature is qualified; S4: If the curvature of the welded pipe after pre-straightening is unqualified, it will be transported to the medium frequency induction coil for heating; If the curvature of the welded pipe after pre-straightening is qualified, the power supply of the heating device is turned off and the welded pipe is not heated; S5: After passing through the heating device, the welded pipe is transferred to the fine straightening roller group to complete the straightening.

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