Cold bending stress straightening device for small-caliber straight welded pipe

Abstract

The utility model discloses a small-caliber straight welded pipe cold bending stress straightening device which comprises two sets of operating tables, connecting plates are fixedly installed on the upper surfaces of the two sets of operating tables, distance adjusting mechanisms are fixedly installed on the upper surfaces of the connecting plates, first straightening rollers are rotatably installed between the two sets of distance adjusting mechanisms, and second straightening rollers are rotatably installed in the operating tables. Balls are rotationally installed in the arc-shaped grooves of the first straightening roller and the second straightening roller, the balls are annularly arranged in the arc-shaped grooves of the first straightening roller and the second straightening roller, and a turnover mechanism is fixedly installed in the middle of the connecting plate. Pressure can be alternately applied to the two sides of the small-caliber straight welded pipe, residual stress is gradually released and homogenized, the stability of the welded pipe is further improved, and uneven stress generated in the welding process is effectively eliminated.

Description

Technical Field

[0001] The utility model belongs to the technical field of straight seam welded pipe processing equipment, in particular to a cold bending stress straightening device for a small-diameter straight seam welded pipe. Background Art

[0002] In the prior art, the steel pipe needs to be cooled after welding, and the cooling will cause stress in the welded pipe, which easily causes the steel pipe to bend. Therefore, the conventional operation is to straighten the welded pipe.

[0003] The patent with announcement number CN112044987B discloses a straightening device for eliminating cold bending stress of small-diameter welded pipes, including multiple straightening roller groups, a drive motor, a control device, and a working power supply; the straightening roller groups are arranged on the same straight line; the straightening roller groups are transmission-connected to the drive motor; the drive motor is electrically connected to the working power supply; the control device can receive the input linear speed and output a frequency modulation signal to the working power supply according to the input linear speed. In the prior art, although the welded pipe can be straightened, it cannot effectively adapt when the input speed changes. Compared with the prior art, this solution adjusts the linear speed of the straightening roller group by adjusting the frequency of the working power supply, thereby effectively adapting to the changing input speed and actual production needs.

[0004] During the process of the straightening device rolling the small-diameter straight seam welded pipe to eliminate stress, the welded pipe cannot be turned over. The pressure applied during the rolling process will be mainly concentrated on one side of the welded pipe, resulting in uneven stress distribution. The stress on one side will be fully eliminated, while a large residual stress will still exist on the other side. The uneven stress distribution will affect the mechanical properties and service life of the welded pipe, resulting in unsatisfactory straightening effect. Utility Model Content

[0005] The utility model aims to provide a cold bending stress straightening device for small-diameter straight seam welded pipes, so as to solve the technical problem proposed in the above-mentioned background technology that in the process of rolling the small-diameter straight seam welded pipes to eliminate stress, the welded pipes cannot be turned over, and the pressure applied during the rolling process will be mainly concentrated on one side of the welded pipe, resulting in uneven stress distribution.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The cold bending stress straightening device for small-diameter straight seam welded pipes comprises two groups of operating tables, a turning area is provided between the two groups of operating tables, connecting plates are fixedly installed on the upper surfaces of the two groups of operating tables, spacing adjustment mechanisms are fixedly installed on the upper surfaces of the connecting plates, and a first straightening roller is rotatably installed between the two groups of spacing adjustment mechanisms.

[0008] Among them, a second straightening roller is rotatably installed in the operating table, and arc-shaped grooves are provided on the outer surfaces of the first straightening roller and the second straightening roller. The arc-shaped grooves of the two sets of opposite first straightening rollers and the second straightening rollers can be spliced ​​into a circular groove, which can bite the small-diameter straight seam welded pipe into the straightening, and balls are rotatably installed in the arc-shaped grooves of the first straightening roller and the second straightening roller. The balls are arranged in a ring shape in the arc-shaped grooves of the first straightening roller and the second straightening roller.

[0009] Among them, a flipping mechanism is fixedly installed in the middle of the connecting plate. The flipping mechanism can protrude from the docking port and touch the surface of the small-diameter straight seam welded pipe. The docking port is opened on the upper surface of the connecting plate, and the flipping mechanism is located in the middle of the flipping area.

[0010] As a preferred solution of the utility model, the spacing adjustment mechanism includes a first motor, which is slidably installed in a sliding groove, the sliding groove is opened on both sides of the operating table, and a first straightening roller is fixedly installed between the output shafts of the two groups of first motors.

[0011] As a further solution of the utility model, limit plates are fixedly installed on both sides of the first motor, and the two sets of limit plates are slidably fitted on the inner and outer surfaces of the operating table through the first motor.

[0012] As a further solution of the utility model, a connecting column is fixedly installed on the upper surface of the first motor, and the connecting columns of each two groups of the first motors penetrate into the upper surface of the connecting plate and a C-shaped plate is fixedly installed between them. The lower surface of the C-shaped plate is fixedly installed on the upper surface of the piston rod of the first hydraulic rod, and the first hydraulic rod is fixedly installed on the upper surface of the connecting plate.

[0013] As a preferred solution of the utility model, the flipping mechanism includes two groups of second hydraulic rods, the two groups of second hydraulic rods are fixedly installed on both sides of the center of the connecting plate, a mounting plate is fixedly installed between the piston rods of the two groups of second hydraulic rods, there is a spacing between the mounting plate and the connecting plate through the piston rod support of the second hydraulic rod, a docking block and a second motor are fixedly installed on the upper surface of the mounting plate, a rubber wheel is fixedly installed on the outer surface of the output shaft of the second motor and the end is rotatably installed in the docking block.

[0014] As a further preferred embodiment of the present invention, the second hydraulic rod can drive the mounting plate to move vertically downward, so that the rubber wheel can protrude from the docking port into the flipping area and can touch the surface of the small-diameter straight seam welded pipe.

[0015] Compared with the prior art, the beneficial effect of the cold bending stress straightening device for small-diameter straight seam welded pipe of the utility model is that: when straightening the small-diameter straight seam welded pipe, the small-diameter straight seam welded pipe can be filled between the first straightening roller and the second straightening roller, and as the second straightening roller is driven by the spacing adjustment mechanism, the small-diameter straight seam welded pipe is bitten into the first straightening roller and the second straightening roller, and the first straightening roller is pushed by the spacing adjustment mechanism to apply a top pressure, so that the first straightening roller and the second straightening roller are rolled on the outer surface of the small-diameter straight seam welded pipe by the top pressure, until the small-diameter straight seam welded pipe is rolled and transmitted to the flipping zone, the flipping mechanism can be started to protrude from the docking port into the flipping zone and can touch the surface of the small-diameter straight seam welded pipe, and as the flipping mechanism is driven, the small-diameter straight seam welded pipe is moved between the first straightening roller and the second straightening roller. The second straightening roller rotates in the arc groove and through the ball until it stops after rotating to 180°, and the flipping mechanism is lifted and reset. The flipped small-diameter straight seam welded pipe can contact the first straightening roller through the other side and be subjected to the roller pressure, ensuring that the pressure on both sides of the small-diameter straight seam welded pipe is uniform. Through the flipping welded pipe function, pressure can be applied alternately to both sides of the small-diameter straight seam welded pipe, so that the residual stress in these areas is gradually released and equalized, further improving the stability of the welded pipe, effectively eliminating the uneven stress generated during the welding process, making the internal stress distribution of the small-diameter straight seam welded pipe more uniform, and reducing stress concentration. Flipping the small-diameter straight seam welded pipe can make the two sides alternately subjected to pressure, so that the straightening effect is better, thereby improving the straightness and overall quality of the small-diameter straight seam welded pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only examples of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the first straightening roller and the second straightening roller in the embodiment of the utility model;

[0019] Figure 3 This is a structural schematic diagram of the spacing adjustment mechanism in the embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the turning mechanism in the embodiment of the utility model.

[0021] Figure numerals: 1. operating table; 101. turning area; 102. second straightening roller; 103. first straightening roller; 104. connecting plate; 105. ball bearing; 106. sliding groove; 107. docking port; 2. spacing adjustment mechanism; 201. first motor; 202. limit plate; 203. connecting column; 204. U-shaped plate; 205. first hydraulic rod; 3. turning mechanism; 301. second hydraulic rod; 302. mounting plate; 303. docking block; 304. second motor; 305. rubber wheel. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the embodiments of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] See also Figure 1-Figure 2 As shown, the cold bending stress straightening device for small-diameter straight seam welded pipes of the utility model embodiment comprises two groups of operating tables 1, a turning area 101 is opened between the two groups of operating tables 1, a connecting plate 104 is fixedly installed on the upper surface of the two groups of operating tables 1, a spacing adjustment mechanism 2 is fixedly installed on the upper surface of the connecting plate 104, and a first straightening roller 103 is rotatably installed between the two groups of spacing adjustment mechanisms 2.

[0026] A second straightening roller 102 is rotatably installed in the operating table 1, and arc-shaped grooves are provided on the outer surfaces of the first straightening roller 103 and the second straightening roller 102. The arc-shaped grooves of the two opposite first straightening rollers 103 and the second straightening roller 102 can be spliced ​​into a circular groove, which can bite the small-diameter straight seam welded pipe into the straightening grooves, and the balls 105 are rotatably installed in the arc-shaped grooves of the first straightening roller 103 and the second straightening roller 102. The balls 105 are arranged in a ring shape in the arc-shaped grooves of the first straightening roller 103 and the second straightening roller 102.

[0027] A flipping mechanism 3 is fixedly installed in the middle of the connecting plate 104. The flipping mechanism 3 can protrude from the docking port 107 and touch the surface of the small-diameter straight seam welded pipe. The docking port 107 is opened on the upper surface of the connecting plate 104, and the flipping mechanism 3 is located in the middle of the flipping area 101.

[0028] When stress relief and straightening of a small-diameter straight seam welded pipe is performed, the small-diameter straight seam welded pipe can be loaded between the first straightening roller 103 and the second straightening roller 102. As the second straightening roller 102 is driven by the spacing adjustment mechanism 2, the small-diameter straight seam welded pipe can be bitten into the first straightening roller 103 and the second straightening roller 102, and then the first straightening roller 103 and the second straightening roller 102 are pushed by the spacing adjustment mechanism 2. By applying a top pressure, the first straightening roller 103 and the second straightening roller 102 can be rolled on the outer surface of the small-diameter straight seam welded pipe by the top pressure, until the small-diameter straight seam welded pipe is rolled and transmitted to the turning area 101, the turning mechanism 3 can be started to extend from the docking port 107 into the turning area 101 and can touch the surface of the small-diameter straight seam welded pipe, and then the small-diameter straight seam welded pipe can be driven between the first straightening roller 103 and the second straightening roller 10 2 and rotates by the ball 105 until it stops after rotating to 180°, so that the flipping mechanism 3 can be lifted and reset, and the flipped small-diameter straight seam welded pipe can contact the first straightening roller 103 through the other side and be subjected to the roller pressure, which can ensure that the pressure on both sides of the small-diameter straight seam welded pipe is uniform, and through the flipping welded pipe function, pressure can be applied alternately to both sides of the small-diameter straight seam welded pipe, so that the residual stress in these areas is gradually released and equalized, and the stability of the welded pipe is further improved, which can more effectively eliminate the uneven stress generated in the welding process, make the internal stress distribution of the small-diameter straight seam welded pipe more uniform, and reduce stress concentration. If it is unilaterally rolled, one side of the small-diameter straight seam welded pipe will be subjected to greater compressive stress, while the stress elimination effect on the other side is relatively weak. Flipping the small-diameter straight seam welded pipe can make the two sides alternately subjected to pressure, so that the straightening effect is better, thereby improving the straightness and overall quality of the small-diameter straight seam welded pipe.

[0029] like Figure 3As shown, the spacing adjustment mechanism 2 includes a first motor 201 slidably installed in a sliding groove 106 . The sliding groove 106 is opened on both sides of the operating table 1 . A first straightening roller 103 is fixedly installed between the output shafts of the two groups of first motors 201 .

[0030] Limiting plates 202 are fixedly installed on both sides of the first motor 201 , and the two sets of limiting plates 202 are slidably attached to the inner and outer surfaces of the operating table 1 through the first motor 201 .

[0031] like Figure 4 As shown, a connecting column 203 is fixedly installed on the upper surface of the first motor 201, and the connecting columns 203 of each two groups of first motors 201 penetrate the upper surface of the connecting plate 104 and a C-shaped plate 204 is fixedly installed between them. The lower surface of the C-shaped plate 204 is fixedly installed on the upper surface of the piston rod of the first hydraulic rod 205, and the first hydraulic rod 205 is fixedly installed on the upper surface of the connecting plate 104.

[0032] When stress is eliminated and straightened for a small-diameter straight seam welded pipe, the worker can load the small-diameter straight seam welded pipe between the first straightening roller 103 and the second straightening roller 102. As the second straightening roller 102 is driven by the first motor 201, the small-diameter straight seam welded pipe can be bitten into the first straightening roller 103 and the second straightening roller 102. Then, the first hydraulic rod 205 can be used to pull the C-shaped plate 204 on the outer surface of the piston rod vertically downward, so that the C-shaped plate 204 can drive the first motor 201 on the lower surface of the connecting column 203 to slide downward in the sliding groove 106, thereby achieving the first hydraulic rod 205 between the two groups of first motors 201. A straightening roller 103 is pressed down on the outer surface of the small-diameter straight seam welded pipe, so that the first straightening roller 103 can be pressed down on the outer surface of the second straightening roller 102 through the top pressure. Through a series of symmetrically arranged first straightening rollers 103 and second straightening rollers 102, when the welded pipe is squeezed by multiple groups of first straightening rollers 103 and second straightening rollers 102, the bending area of ​​the welded pipe will be deformed under the pressure of the first straightening rollers 103 and the second straightening rollers 102, so that the welded pipe returns to a straight state. In this process, the welded pipe is flipped by the flipping mechanism 3 to apply and release pressure on the other side, which can gradually eliminate the uneven stress inside the welded pipe.

[0033] like Figure 4As shown, the flip mechanism 3 includes two groups of second hydraulic rods 301, and the two groups of second hydraulic rods 301 are fixedly installed on both sides of the center of the connecting plate 104. A mounting plate 302 is fixedly installed between the piston rods of the two groups of second hydraulic rods 301. There is a spacing between the mounting plate 302 and the connecting plate 104 through the piston rod support of the second hydraulic rods 301. A docking block 303 and a second motor 304 are fixedly installed on the upper surface of the mounting plate 302. A rubber wheel 305 is fixedly installed on the outer surface of the output shaft of the second motor 304, and the end is rotatably installed in the docking block 303.

[0034] The second hydraulic rod 301 can drive the mounting plate 302 to move vertically downward, so that the rubber wheel 305 can protrude from the docking port 107 into the flipping area 101 and can touch the surface of the small-diameter straight seam welded pipe.

[0035] In summary, the embodiment of the utility model can alternately apply pressure to both sides of a small-diameter straight seam welded pipe, so that the residual stress is gradually released and homogenized, further improving the stability of the welded pipe, and more effectively eliminating the uneven stress generated during the welding process.

[0036] The above shows and describes the basic principles of the present invention. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only intended to illustrate the principles of the present invention. Without departing from the scope of the present invention, any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. Cold bending stress straightening device for small diameter straight seam welded pipe, characterized by: It comprises two groups of operating tables (1), a turning area (101) is provided between the two groups of operating tables (1), a connecting plate (104) is fixedly installed on the upper surface of the two groups of operating tables (1), a spacing adjustment mechanism (2) is fixedly installed on the upper surface of the connecting plate (104), and a first straightening roller (103) is rotatably installed between the two groups of spacing adjustment mechanisms (2); A second straightening roller (102) is rotatably mounted in the operating table (1); arc-shaped grooves are provided on the outer surfaces of the first straightening roller (103) and the second straightening roller (102); the arc-shaped grooves of the two opposite groups of the first straightening roller (103) and the second straightening roller (102) can be spliced ​​into a circular groove, so that a small-diameter straight seam welded pipe can be bitten into the groove for straightening; balls (105) are rotatably mounted in the arc-shaped grooves of the first straightening roller (103) and the second straightening roller (102); the balls (105) are arranged in a ring shape in the arc-shaped grooves of the first straightening roller (103) and the second straightening roller (102); A turnover mechanism (3) is fixedly installed in the middle of the connecting plate (104); the turnover mechanism (3) can protrude from the docking port (107) and contact the surface of the small-diameter straight-seam welded pipe; the docking port (107) is formed on the upper surface of the connecting plate (104), and the turnover mechanism (3) is located in the middle of the turnover area (101).

2. The cold bending stress straightening device for small-diameter straight seam welded pipe according to claim 1 is characterized in that: The spacing adjustment mechanism (2) comprises a first motor (201), the first motor (201) being slidably mounted in a sliding groove (106), the sliding groove (106) being provided on both sides of the operating table (1), and a first straightening roller (103) being fixedly mounted between the output shafts of two groups of the first motors (201).

3. The cold bending stress straightening device for small-diameter straight seam welded pipe according to claim 2 is characterized in that: Limiting plates (202) are fixedly mounted on both sides of the first motor (201), and two sets of limiting plates (202) are slidably fitted on the inner and outer surfaces of the operating table (1) through the first motor (201).

4. The cold bending stress straightening device for small-diameter straight seam welded pipe according to claim 2 is characterized in that: A connecting column (203) is fixedly mounted on the upper surface of the first motor (201); the connecting columns (203) of each two groups of the first motors (201) penetrate the upper surface of the connecting plate (104) and a C-shaped plate (204) is fixedly mounted between them; the lower surface of the C-shaped plate (204) is fixedly mounted on the upper surface of the piston rod of the first hydraulic rod (205); and the first hydraulic rod (205) is fixedly mounted on the upper surface of the connecting plate (104).

5. The cold bending stress straightening device for small-diameter straight seam welded pipe according to claim 1 is characterized in that: The tilting mechanism (3) comprises two groups of second hydraulic rods (301), the two groups of second hydraulic rods (301) are fixedly mounted on both sides of the center of the connecting plate (104), a mounting plate (302) is fixedly mounted between the piston rods of the two groups of second hydraulic rods (301), a spacing is provided between the mounting plate (302) and the connecting plate (104) through the piston rod support of the second hydraulic rods (301), a docking block (303) and a second motor (304) are fixedly mounted on the upper surface of the mounting plate (302), a rubber wheel (305) is fixedly mounted on the outer surface of the output shaft of the second motor (304), and the end portion is rotatably mounted in the docking block (303).

6. The cold bending stress straightening device for small-diameter straight seam welded pipe according to claim 5 is characterized in that: The second hydraulic rod (301) can drive the mounting plate (302) to move vertically downward, so that the rubber wheel (305) can protrude from the docking port (107) into the flipping area (101) and can contact the surface of the small-diameter straight-seam welded pipe.

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