Leveling protection assembly for welded pipe production and welded pipe production line comprising same

Abstract

The utility model discloses a leveling protection assembly used for welded pipe production and a welded pipe production line comprising the same, the leveling protection assembly comprises a rack, the rack is sequentially provided with a hemming module, a welding module and an outer leveling module along the conveying direction, the welding module is provided with a welding head, and the outer leveling module reciprocates along the conveying direction; the mounting frame is connected to the rack, the mounting frame is located in the hemming module, the mounting frame is connected with a driving device, the driving device is connected with an inner leveling rod, the driving device drives the inner leveling rod to reciprocate in the conveying direction, and the inner leveling rod extends to the outer leveling module; an inner leveling grinding head is arranged at the tail end of the inner leveling rod, a cavity is formed in the inner leveling rod, the inner leveling rod is connected with an inner protection air pipe communicated with the cavity, and an inner protection air hole is formed in the inner leveling rod. The driving device drives the inner leveling rod to do reciprocating motion in the conveying direction, inner leveling is conducted on the inner welding seam of the welded pipe through the inner leveling grinding head, and the protection range of inner protection gas in the welded pipe can be expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steel pipe production, especially relates to a flattening protection assembly for welded pipe production and a welded pipe production line comprising the same. BACKGROUND

[0002] At present, stainless steel welded pipes are widely used in various industries, and their forming process is roughly as follows: the steel coil is placed on a unwinding machine, the steel strip is first pulled and flattened by an extension module, then gradually rolled inward into an open circular pipe by a edge rolling module, the open circular pipe has its opening facing upward, then the shape of the open circular pipe is rounded by a rounding module, the rounded open circular pipe is welded by a welding module to form a weld, then the outer weld of the welded pipe is flattened by an outer flattening device, and finally the pipe material is cut off by a pipe cutting module. However, since the inner weld of the welded pipe has not been flattened at this time, its interior is relatively rough and cannot be directly applied to the pipeline industry, so the weld needs to be internally flattened in subsequent processes to obtain a welded pipe product.

[0003] In addition, during welding, protective gas is generally introduced into the welded pipe to prevent the weld from oxidizing and ensure the welding quality, but the welding protection of the interior of the welded pipe is often neglected, resulting in the oxidation of the weld on the inner side wall of the welded pipe, which weakens the overall structural strength of the welded pipe. SUMMARY

[0004] The utility model aims at providing a flattening protection assembly for welded pipe production, which integrates internal flattening and internal protective gas functions.

[0005] The flattening protection assembly for welded pipe production according to the first aspect of the utility model comprises:

[0006] a rack, which is sequentially provided with an edge rolling module, a welding module and an outer flattening module along a conveying direction, the welding module is provided with a welding head, the outer flattening module reciprocates along the conveying direction, and the outer flattening module is provided with an outer flattening roller;

[0007] a mounting frame, which is connected to the rack, is located in the edge rolling module, is connected with a driving device, and is connected with an internal flattening rod, the driving device drives the internal flattening rod to reciprocate along the conveying direction, the internal flattening rod extends to the outer flattening module, the end of the internal flattening rod is provided with an internal flattening grinding head, the internal flattening rod is internally provided with a cavity, the internal flattening rod is connected with an internal protective gas pipe which is communicated with the cavity, and the internal flattening rod is provided with an internal protective gas hole.

[0008] The flattening protection assembly for welded pipe production has at least the following beneficial effects: during production, the steel belt is gradually rolled inward into an open circular pipe under the action of the edge rolling module, the welding head performs shielded welding on the open circular pipe and forms a weld, the outer flattening module reciprocates along the conveying direction and flattens the outer weld of the welded pipe through the outer flattening rollers; at the same time, the driving device drives the inner flattening rod to reciprocate along the conveying direction and flattens the inner weld of the welded pipe through the inner flattening grinding head, the inner protection gas holes on the inner flattening rod continuously output inner protection gas in the welded pipe, and since the inner flattening rod can reciprocate along the conveying direction, the protection range of the inner protection gas in the welded pipe is expanded, and the quality of the weld is effectively improved.

[0009] According to some embodiments of the present application, in order to further improve the welding quality, the inner protection gas holes are directed towards the weld of the welded pipe.

[0010] According to some embodiments of the present application, during welding, the high temperature generated by the electric arc melts the welding material to form a weld, and if the flow rate and pressure of the inner protection gas and the outer protection gas are not properly set, the temperature of the welding area may be too high, which may burn through the welded pipe, in order to avoid the welded pipe being burned through, the movement path of the inner protection gas holes is located at a downstream position of the welding head, so as to stagger the protection ranges of the inner protection gas and the outer protection gas.

[0011] According to some embodiments of the present application, the number of inner protection gas holes is multiple, so as to further expand the protection range of the inner protection gas.

[0012] According to some embodiments of the present application, in order to avoid interference, the mounting frame is provided with a mounting block suspended above the rack, the lower end of the mounting block is provided with a fixed pulley, the mounting block is connected with the driving device, the driving device is provided with a telescopic portion capable of telescoping up and down, a steel wire rope is connected between the telescopic portion and the inner flattening rod, and the steel wire rope slides along the fixed pulley.

[0013] According to some embodiments of the present application, the diameter of the steel wire rope is not less than 8 mm. The steel wire rope adopts a diameter far exceeding the required tension standard, so as to improve the rigidity of the steel wire rope and better transmit the acting force to the inner flattening rod.

[0014] According to some embodiments of the present application, the fixed pulley is connected with a limiting belt, the limiting belt and the fixed pulley jointly form a limiting space, the steel wire rope passes through the limiting space, so as to prevent the steel wire rope from falling off the fixed pulley under the action of gravity, and thus the movement direction of the steel wire rope is limited.

[0015] The welded pipe production line according to the second aspect of the present application comprises:

[0016] The above-mentioned flattening protection assembly for welded pipe production;

[0017] A pay-off module is located at an upstream position of the rack;

[0018] A pipe cutting module is connected to the rack and located at a downstream position of the outer flattening module;

[0019] A blanking module is connected to the rack and located at a downstream position of the pipe cutting module.

[0020] Additional aspects and advantages of the present application will be described in the following description, become apparent from it, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a perspective structural schematic view of the flattening protection assembly for welded pipe production provided by the embodiment of the present application;

[0023] Figure 2 is Figure 1 a front view of the flattening protection assembly for welded pipe production shown in the figure;

[0024] Figure 3 is a perspective structural schematic view of the inner flattening rod provided by the embodiment of the present application.

[0025] In the drawings: 100-rack, 200-mounting rack, 300-inner flattening rod, 400-crimping module, 500-welding module, 600-outer flattening module, 510-welding head, 610-main body seat, 620-outer flattening roller, 110-guide rod, 630-sliding block, 640-electric control screw mechanism, 210-mounting block, 220-fixed pulley, 230-driving device, 231-telescopic part, 240-steel wire rope, 310-inner flattening grinding head, 321-inner protection air pipe, 320-inner protection air hole, 221-limiting belt. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the utility model, if the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first and second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0028] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first and second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0029] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0030] As shown in Figure 1 and Figure 2 According to the first aspect embodiment of the utility model for the welding pipe production, the leveling protection assembly includes rack 100, mounting frame 200 and inner leveling rod 300, rack 100 is sequentially provided with edge rolling module 400, welding module 500 and outer leveling module 600 along the conveying direction of welding pipe. In order to facilitate the description, the outer leveling module 600 is located in front of the welding module 500, and the edge rolling module 400 is located behind the welding module 500. The edge rolling module 400 includes a plurality of edge rolling rollers driven by a speed reducer, and the edge rolling range of each edge rolling roller gradually increases from back to front, so that the edge rolling module 400 can gradually roll the strip into an open circular pipe (not shown in the drawing) with the opening upward as the strip continuously moves forward. The rotation axis of part of the edge rolling rollers is orthogonal to the conveying direction along the horizontal direction, and the rotation axis of part of the edge rolling rollers is orthogonal to the conveying direction along the vertical direction. The user of the equipment can select different edge rolling modes according to the actual edge rolling requirements, but the utility model does not limit the specific edge rolling mode. As long as the edge rolling module 400 can gradually roll the strip into an open circular pipe, no matter what edge rolling mode the edge rolling module 400 adopts, it all belongs to the protection scope of the utility model.

[0031] The welding module 500 comprises a pipe clamping device (not shown in the drawings) and a welding head 510, the pipe clamping device is used to clamp the open pipe, reduce the width of the weld, so as to facilitate the welding of the welding head 510. The welding head 510 is connected with an external welding device, and the welding head 510 has a protective gas function, which can output external protective gas such as nitrogen to the outer weld during welding.

[0032] The outer leveling module 600 comprises a main body seat 610 and two outer leveling rollers 620, which are arranged on the main body seat 610 in the up-down direction and form a passable channel between the two outer leveling rollers 620, and the outer leveling roller 620 located on the upper side is provided with an outer polishing part (not shown in the drawings) at the corresponding position of the outer weld of the welded pipe. In addition, the rack 100 is provided with two guide rods 110 parallel to the conveying direction, and each side of the main body seat 610 is provided with a sliding block 630, each sliding block 630 is internally provided with a guide sleeve in sliding connection with the guide rod 110, and the main body seat 610 is further connected with the rack 100 through an electric control screw mechanism 640, so that the outer leveling module 600 can reciprocate in the conveying direction under the control of the electric control, thereby continuously polishing the outer weld of the welded pipe to achieve the purpose of outer leveling.

[0033] In addition, the mounting bracket 200 is connected to the rack 100 and located in the edge rolling module 400. Since the open pipe needs to go through a series of inner rolling processes during forming, and the opening of the open pipe is upward, the installation position of the mounting bracket 200 needs to avoid the edge rolling module 400. Since the opening of the open pipe is upward, there is enough installation space above the open pipe, so the mounting bracket 200 is provided with a mounting block 210 suspended above the rack 100, and the lower end of the mounting block 210 is provided with a fixed pulley 220 which is away from the blank. The mounting block 210 is connected with a driving device 230, which can be selected as a pneumatic cylinder, and the driving device 230 is provided with a telescopic part 231 which can be telescoped up and down, and the telescopic part 231 is connected with a steel wire rope 240 between the inner leveling rod 300, and the steel wire rope 240 slides along the fixed pulley 220. When the driving device 230 extends the telescopic part 231 downward, the steel wire rope 240 drives the inner leveling rod 300 to move in the downstream direction under the guidance of the fixed pulley 220; when the driving device 230 retracts the telescopic part 231 upward, the steel wire rope 240 drives the inner leveling rod 300 to move in the upstream direction under the guidance of the fixed pulley 220, so as to realize the reciprocating movement of the inner leveling rod 300 in the conveying direction.

[0034] In other embodiments, the driving device 230 can also be provided with a telescopic part 231 which can be telescoped in the conveying direction, at this time the mounting block 210 does not need to be provided with the fixed pulley 220, and the telescopic part 231 is directly connected with the inner leveling rod 300.

[0035] AsFigure 1 and Figure 3 As shown in the figure, the length of the inner leveling rod 300 extends to the outer leveling module 600, and the end of the inner leveling rod 300 is provided with an inner leveling grinding head 310, the size of the inner leveling grinding head 310 is consistent with the inner diameter of the welded pipe, so that the end of the inner leveling rod 300 can be supported in the welded pipe through the inner leveling grinding head 310. The inner leveling rod 300 is provided with a cavity, and the inner leveling rod 300 is connected with an inner protective gas pipe 321 which is communicated with the cavity, and the inner leveling rod 300 is provided with an inner protective gas hole 320 which is directed to the weld of the welded pipe. The inner protective gas pipe 321 fills the inner protective gas into the inner leveling rod 300, and the inner protective gas can be selected as nitrogen, and the inner protective gas flows out from the inner protective gas hole 320 to protect the inner weld. Since the inner protective gas is mainly used to protect the inner weld from oxidation and blackening, the position of the inner protective gas hole 320 needs to match the welding module 500.

[0036] It should be noted that during welding, the high temperature generated by the electric arc melts the welding material to form a weld. If the flow and pressure of the inner protective gas and the outer protective gas are not properly set, it may cause the temperature of the welding area to be too high, thereby burning through the welded pipe. In order to avoid burning through the welded pipe, the moving path of the inner protective gas hole 320 is located at the downstream position of the welding head 510, so as to stagger the protection range of the inner protective gas and the outer protective gas. That is to say, the outer protective gas is mainly used to provide gas protection for the welding point of the welded pipe, and the inner protective gas is mainly used to provide gas protection for the weld of the welded pipe.

[0037] With the above structure, during production, the steel strip is gradually rolled inward into an open circular pipe under the action of the edge rolling module 400, the welding head 510 protects and welds the opening of the open circular pipe to form a weld, the outer leveling module 600 reciprocates along the conveying direction and performs outer leveling on the outer weld of the welded pipe through the outer grinding part of the outer leveling roller 620. At the same time, the driving device 230 drives the inner leveling rod 300 to reciprocate along the conveying direction, and performs inner leveling on the inner weld of the welded pipe through the inner leveling grinding head 310. The inner protective gas hole 320 on the inner leveling rod 300 continuously outputs the inner protective gas in the welded pipe, and since the inner leveling rod 300 can reciprocate along the conveying direction, it is beneficial to expand the protection range of the inner protective gas in the welded pipe, and effectively improve the quality of the weld.

[0038] Further, in order to expand the protection range of the inner protective gas, the number of the inner protective gas holes 320 is multiple, and in this embodiment, the number of the inner protective gas holes 320 can be selected as three, and the three inner protective gas holes 320 are arranged at intervals along the length direction of the inner leveling rod 300.

[0039] As Figure 2As shown, in some embodiments of this utility model, in order to improve the stiffness of the wire rope 240, the diameter of the wire rope 240 is not less than 8mm. The wire rope 240 adopts a diameter that far exceeds the required tensile strength standard, in order to better transmit the force to the inner leveling rod 300 and avoid the wire rope 240 from bending due to insufficient stiffness during the force transmission process, thereby causing the inner leveling rod 300 to be unable to reciprocate along the conveying direction.

[0040] In some embodiments of this utility model, the fixed pulley 220 is connected to the limiting belt 221, and the limiting belt 221 and the fixed pulley 220 together form a limiting space. The wire rope 240 passes through the limiting space to prevent the wire rope 240 from falling off the fixed pulley 220 under the action of gravity, thereby limiting the movement direction of the wire rope 240.

[0041] According to a second aspect of the present invention, a welded pipe production line includes a leveling and protection assembly for welded pipe production according to the first aspect of the present invention, and further includes at least an unwinding module (not shown in the figures), a pipe cutting module (not shown in the figures), and a blanking module (not shown in the figures). The unwinding module is located upstream of the frame 100 and is used to place coiled material, which may be coiled steel or coiled aluminum. The pipe cutting module is connected to the frame 100 and located downstream of the outer leveling module 600. The pipe cutting module includes a cutting machine that is driven and lifted by a linear telescopic device. After a certain time interval, the cutting machine cuts the welded pipe under the drive of the linear telescopic device to obtain a welded pipe of a specified length. The blanking module is connected to the frame 100 and located downstream of the pipe cutting module. The blanking module is a blanking rack with a blanking channel. The cut welded pipes fall from the blanking channel to the blanking rack for stacking.

[0042] Since the welded pipe production line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0043] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A leveling and protection assembly for welded pipe production, characterized in that, include: The frame (100) is provided with a crimping module (400), a welding module (500) and an outer leveling module (600) in sequence along the conveying direction. The welding module (500) is provided with a welding head (510). The outer leveling module (600) reciprocates along the conveying direction and is provided with an outer leveling roller (620). A mounting bracket (200) is connected to the frame (100). The mounting bracket (200) is located in the hemming module (400). The mounting bracket (200) is connected to a driving device (230). The driving device (230) is connected to an inner leveling rod (300). The driving device (230) drives the inner leveling rod (300) to reciprocate along the conveying direction. The inner leveling rod (300) extends to the outer leveling module (600). An inner leveling grinding head (310) is provided at the end of the inner leveling rod (300). A cavity is provided inside the inner leveling rod (300). An inner protective air pipe (321) is connected to the inner leveling rod (300) and communicates with the cavity. An inner protective air hole (320) is provided in the inner leveling rod (300).

2. The leveling and protection assembly for welded pipe production according to claim 1, characterized in that: The inner protective pore (320) faces the weld seam of the welded pipe.

3. The leveling and protection assembly for welded pipe production according to claim 1 or 2, characterized in that: The movement path of the inner protective pore (320) is located downstream of the weld head (510).

4. The leveling and protection assembly for welded pipe production according to claim 3, characterized in that: The number of the inner protective vents (320) is multiple.

5. The leveling and protection assembly for welded pipe production according to claim 1, characterized in that: The mounting frame (200) is provided with a mounting block (210) suspended above the frame (100). The lower end of the mounting block (210) is provided with a fixed pulley (220). The mounting block (210) is connected to the driving device (230). The driving device (230) is provided with a telescopic part (231) that can extend and retract vertically. A steel wire rope (240) is connected between the telescopic part (231) and the inner leveling rod (300). The steel wire rope (240) slides along the fixed pulley (220).

6. The leveling and protection assembly for welded pipe production according to claim 5, characterized in that: The diameter of the wire rope (240) is not less than 8mm.

7. The leveling and protection assembly for welded pipe production according to claim 5, characterized in that: The fixed pulley (220) is connected to the limiting belt (221), and the limiting belt (221) and the fixed pulley (220) together form a limiting space, through which the wire rope (240) passes.

8. A welded pipe production line, characterized in that, include: The leveling and protection assembly for welded pipe production as described in any one of claims 1 to 7; An unwinding module is located upstream of the frame (100); A pipe cutting module, which is connected to the frame (100) and located downstream of the outer leveling module (600); The blanking module is connected to the frame (100) and located downstream of the pipe cutting module.

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