A front-swing spiral welded pipe machine

Abstract

A front-swing spiral pipe welding machine includes a front bridge, a spiral former, and a rear bridge, characterized in that: a base is provided at the bottom of the spiral former, the base is fixed to the ground, the spiral former can rotate horizontally relative to the base around its swing center, and the rotation center of the front bridge and the spiral former is hinged to the same axis as the swing center, the other end of the front bridge is provided with a ground anchor and an oil cylinder, the ground anchor is fixed to the ground, one end of the oil cylinder is hinged to the front bridge, and the other end is connected to the ground anchor, and a forming angle locking rod is also provided between the front bridge and the spiral former, the length of the forming angle locking rod is adjustable, and the two ends of the forming angle locking rod are respectively connected to the side of the front bridge and the side of the spiral former. The present invention provides a spiral former and a front bridge that rotate horizontally with a small amplitude synchronously, so that the spiral angle θ remains unchanged and the spiral joint gap can be adjusted to an appropriate state. The spiral pipe welding machine has better production quality, higher production efficiency, and higher safety.

Description

Technical Field

[0001] The invention relates to the field of spiral welded pipe production equipment, in particular to a front-swing spiral welded pipe machine. Background Art

[0002] Spiral pipe welding machines are used to manufacture spiral welded pipes. They can produce pipes of different diameters from strip steel of the same width, and vice versa. Currently, spiral pipe welding machines primarily consist of a front axle, a spiral former, and a rear axle. Depending on the angle adjustment method, they are categorized as either a front-swing type, where the front axle swings to adjust the forming angle of the spiral welded pipe, or a rear-swing type, where the rear axle swings to adjust the forming angle of the spiral welded pipe.

[0003] After searching, the design of the front-swing spiral welded pipe machine is typically such as the invention patent application document with patent number CN201711405629.4 (application publication number CN107877025A). The front-swing reinforced thin-walled spiral welded pipe machine includes a front axle, a forming machine and a rear axle. The front axle and the rear axle are respectively hinged at both ends of the bottom of the forming machine. A rotating shaft is provided at the hinge position of the front axle and the forming machine. The front axle rotates on the concentric slide rail through a pulley to adjust the angle between the front axle and the forming machine. The angle is the spiral angle θ. The steel strip is continuously fed into the forming machine at this angle for spiral curling and forming. The spiral welded pipe continues to grow and extend to the rear axle. The rear axle is equipped with output rollers, a flying cutting trolley, a straightening device and an internal and external welding device to output the produced spiral welded pipe. When the spiral welded pipe grows to a sufficient length, the spiral welded pipe of the required length can be cut on the rear axle, and the remaining part continues the production cycle of the next spiral welded pipe.

[0004] In the actual production process of spiral welded pipes, the deviation of the straightness of the edge line of the steel strip causes the gap at the joint of the spiral welded pipe to change, resulting in problems such as the gap being too large to weld or the overlap of the steel strip not being able to close. Usually, the rear axle is allowed to swing at a small angle (within the range of ±1°) at any time through the cylinder, so that the gap at the spiral joint is always in an appropriate state. However, the swinging of the rear axle will affect the operation of the rear axle when welding, online testing, pipe cutting and offline operations are required on the rear axle, resulting in poor production quality, low production efficiency and low safety of the spiral welded pipe machine. Therefore, further improvement is necessary. Summary of the Invention

[0005] Aiming at the problems in the prior art of adjusting the gap at the spiral joint by swinging the rear axle, which causes the spiral pipe welding machine to have poor production quality, low production efficiency and low safety, the present invention provides a front-swing spiral pipe welding machine.

[0006] The technical solution adopted by the present invention is: a front-swing spiral welding pipe machine, comprising a front bridge, a spiral former and a rear bridge, one end of the front bridge is hinged to the spiral former, a plurality of concentric slide rails are provided under the front bridge, a pulley is provided between the front bridge and the slide rails, the rear bridge is arranged on one side of the spiral welded pipe extending direction of the spiral former, and the rear bridge is fixed to the ground, which is characterized in that: a base is provided at the lower part of the spiral former, the base is fixed to the ground, the spiral former can rotate horizontally relative to the base around its swing center, and the rotation center of the hinged connection of the front bridge and the spiral former is located on the same axis as the swing center, the other end of the front bridge is provided with a ground anchor and an oil cylinder, the ground anchor is fixed to the ground, one end of the oil cylinder is hinged to the front bridge, and the other end is connected to the ground anchor, and a forming angle locking rod is also provided between the front bridge and the spiral former, the length of the forming angle locking rod is adjustable, and the two ends of the forming angle locking rod are respectively connected to the side of the front bridge and the side of the spiral former.

[0007] Preferably, the base is provided with limit blocks for limiting the horizontal rotation range of the spiral former, the limit blocks being located on both sides of the spiral former. The limit blocks limit the horizontal rotation range between the spiral former and the base to within ±1°.

[0008] Preferably, the bottom of the spiral former is supported on the base by a plurality of rollers.

[0009] Preferably, the roller is mounted on the spiral former, and the axis of the roller shaft passes through the swing center.

[0010] Preferably, the formed angle locking rod adopts a positive and negative thread adjusting screw.

[0011] Compared with the prior art, the advantages of the present invention are: after the front-swing spiral pipe welding machine swings the front axle to lock the spiral angle θ through the forming angle locking rod, during the spiral welded pipe production process, the front axle and the spiral former are synchronously rotated horizontally by a small amplitude by adjusting the oil cylinder, so that the spiral angle θ remains unchanged and the spiral seam gap can be adjusted to a suitable state, that is, there is no need to swing the rear axle to adjust the spiral seam gap, which is conducive to welding, online testing, steel pipe cutting and offline work on the rear axle, so that the spiral welded pipe machine has better production quality, higher production efficiency and higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of a top view of the structure of an embodiment of the present invention;

[0013] Figure 2 for Figure 1 A partial enlarged view of point A;

[0014] Figure 3 for Figure 1 A partial enlarged view of point B;

[0015] Figure 4 1 is a side view of a spiral former and a base according to an embodiment of the present invention.

[0016] Icons: 1-front axle; 2-spiral former; 3-rear axle; 4-base; 5-ground anchor; 6-oil cylinder; 7-forming angle locking rod; 8-limit block; 9-roller; 10-slide rail; 11-swing center. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-4 As shown, a front-swing spiral pipe welding machine according to an embodiment of the present invention comprises a front bridge 1, a spiral former 2 and a rear bridge 3, one end of the front bridge 1 is hinged to the spiral former 2, a plurality of concentric slide rails 10 are provided under the front bridge 1, a pulley is provided between the front bridge 1 and the slide rail 10, the rear bridge 3 is arranged on one side of the spiral welded pipe extending direction of the spiral former 2, and the rear bridge 3 is fixed to the ground; a base 4 is provided at the lower part of the spiral former 2, the base 4 is fixed to the ground, the spiral former 2 can rotate horizontally relative to the base 4 around its swing center 11, and the rotation center of the hinged connection between the front bridge 1 and the spiral former 2 is located on the same axis as the swing center 11, and a limit block 8 for limiting the horizontal rotation range of the spiral former 2 is provided on the base 4, the limit block 8 is located on both sides of the spiral former 2, and the limit block 8 limits the horizontal rotation range between the spiral former 2 and the base 4 to between ±1°; in addition, the spiral former The bottom of the former 2 is supported on the base 4 by multiple rollers 9. The rollers 9 are installed on the spiral former 2, and the axis of the roller 9 axle passes through the swing center 11; the other end of the front bridge 1 is provided with a ground anchor 5 and a cylinder 6. The ground anchor 5 is fixed to the ground. One end of the cylinder 6 is hinged to the front bridge 1, and the other end is connected to the ground anchor 5. The cylinder 6 is connected to the ground anchor 5 at different positions to adjust the spiral angle θ; in addition, a forming angle locking rod 7 is provided between the front bridge 1 and the spiral former 2. The length of the forming angle locking rod 7 is adjustable. The two ends of the forming angle locking rod 7 are respectively connected to the side of the front bridge 1 and the side of the spiral former 2. The forming angle locking rod 7 adopts a positive and negative wire adjustment screw. During the production process of spiral welded pipes, when the front bridge 1 swings slightly through the cylinder 6, the forming angle locking rod 7 causes the spiral former 2 to rotate slightly horizontally relative to the base 4, so that the spiral seam gap can always be in a suitable state when the spiral angle θ remains unchanged.

[0019] In summary, the specific working process of the embodiment of the front-swing spiral pipe welding machine provided by the present invention is as follows:

[0020] A. Connecting the ground anchors 5 at different positions via the oil cylinder 6 to swing the front axle 1, thereby adjusting the spiral angle θ between the front axle 1 and the spiral former 2;

[0021] B. After the spiral angle θ is adjusted, the forming angle locking rod 7 locks the spiral angle θ, thereby carrying out the production of the spiral welded pipe;

[0022] C. During the production of spiral welded pipes, the front axle 1 swings slightly through the oil cylinder 6 and drives the spiral former 2 to rotate horizontally and synchronously, so that the spiral angle θ between the front axle 1 and the spiral former 2 remains unchanged, while the spiral joint gap can be adjusted to a suitable state;

[0023] D. Perform welding, online monitoring, steel pipe cutting and offline operations on the spiral welded pipe on the rear axle 3, thereby completing the production of the spiral welded pipe.

Claims

1. A front-swing spiral welded pipe machine, comprising a front bridge (1), a spiral former (2) and a rear bridge (3), one end of the front bridge (1) being hinged to the spiral former (2), a plurality of concentric circular slide rails (10) being provided below the front bridge (1), a pulley being provided between the front bridge (1) and the slide rails (10), the rear bridge (3) being provided on one side of the spiral welded pipe extending direction of the spiral former (2), and the rear bridge (3) being fixed to the ground, characterized in that: The lower part of the spiral former (2) is provided with a base (4), and the base (4) is fixed to the ground. The spiral former (2) can rotate horizontally relative to the base (4) around its swing center (11), and the rotation center of the front bridge (1) and the spiral former (2) are hinged on the same axis as the swing center (11). The other end of the front bridge (1) is provided with a ground anchor (5) and an oil cylinder (6), and the ground anchor (5) is fixed to the ground. One end of the oil cylinder (6) is hinged to the front bridge (1), and the other end is connected to the ground anchor (5). A forming angle locking rod (7) is also provided between the front bridge (1) and the spiral former (2). The length of the forming angle locking rod (7) is adjustable, and the two ends of the forming angle locking rod (7) are respectively connected to the side of the front bridge (1) and the side of the spiral former (2).

2. The front-swing spiral pipe welding machine according to claim 1, characterized in that: The base (4) is provided with a limit block (8) for limiting the horizontal rotation range of the spiral former (2), and the limit blocks (8) are located on both sides of the spiral former (2).

3. The front-swing spiral pipe welding machine according to claim 2, characterized in that: The bottom of the spiral former (2) is supported on the base (4) via a plurality of rollers (9).

4. The front-swing spiral pipe welding machine according to claim 3, characterized in that: The roller (9) is mounted on the spiral former (2), and the axis of the roller (9) axle passes through the swing center (11).

5. The front-swing spiral pipe welding machine according to claim 3 or 4, characterized in that: The formed angle locking rod (7) adopts a positive and negative thread adjusting screw.

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