JPS5897425A - Method for continuous coiling of small-sized steel pipe - Google Patents

Abstract

PURPOSE:To take up into coils one by one while continuously feeding a steel pipe, by increasing the treating speed of a prebending mechanism and a coiling device at the time of pipe cutting, in bending the continuously supplied small- sized steel pipe and taking it up into plural coils. CONSTITUTION:In manufacturing, for instance, a wire rod having flux, a hoop 12 is formed into an electric resistance welded pipe 22 and is continuously fed to a prebending mechanism 26. The pipe 22 is continuously bent, here, into a spiral shape and is dropped on a take-up device 28 to be taken up as a coil. When a coil 22a reaches the prescribed height, a cutter 20 cuts the pipe 22 off. Then the rotating speed of a torque motor 30 used for driving the mechanism 26 is increased because its load is reduced, and the pipe 22 is taken up at high speed. In conformity with the increase of the speed of mechanism 26, the device 28 is rotated at high speed. Thus, the distance between the tail end of the preceding pipe and the leading tip of the succeeding pipe is gradually enlarged, and comes to require a prescribed time until the succeeding pipe arrives at the device 28, then the device 28 can be replaced during said interval.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous winding method for a small-diameter steel pipe, in which a relatively small-diameter steel pipe is continuously fed, bent by a coiling mechanism, and then wound by a winding device into a coil. Regarding.

To manufacture all flux-cored wires for welding, one step h I
A hoop or tape-shaped steel strip is made by slitting it in the longitudinal direction, then it is bent from both sides to form a tubular shape, and the joints are welded to form an electric resistance welded pipe. After the pipe is annealed and budded (diameter reduced), it is filled with purple flux, and then wire drawn, annealed, and plated (~ to make a product (flux-cored wire). Pipe making, that is, welding, is performed in a continuous manner. It is efficient to do so, and if welding is interrupted, not only will the operating rate of the equipment be completely reduced, but also the interruption will generate defective products containing polyacids, which will reduce the yield. Since it is not possible to leave the coil in place, it is bent using a curling mechanism and then wound into a coil using a sizing device. However, since the coil size is limited, once the specified diameter and straightness have been reached, it is considered that one coil has been manufactured. Hke (January 4) rL,, the '#' after that starts winding as another coil.

Winding curl imparting mechanism: If there is one, the winding device that sequentially uses the four turns 'f' bent by the rock groove to form a coil will be placed directly below the winding curl imparting mechanism. Therefore, when one coil is finished and the next coil is to be wound, what happens to the finished coil and its winding device (bobbin mechanism)? It is necessary to remove the winding device and bring in another winding device directly below the curling mechanism, which requires some time. Therefore, since the ERW tube is continuously supplied, if nothing is done, the lower part of the curling mechanism will not be wrapped. A pile of attached ERW tubes is completed. If the supply of electrical resistance welded pipes is completely stopped, that is, welding is stopped, as mentioned above, a large number of defective products will be generated and the equipment operating rate will be reduced.

The present invention attempts to deal with this problem, and is characterized by applying curls to a continuously supplied small-diameter steel pipe using a curling mechanism, and winding it into a coil using a winding device. In addition, in a method for winding small-diameter steel materials in which the core steel pipe is cut into appropriate lengths to form multiple coils of a predetermined size, the processing speed of the curling mechanism and winding device is increased when the small-diameter steel pipe is completely cut. The predetermined amount of time is required from the time when the number of turns of the preceding steel pipe to the time when the following steel pipe reaches the winding device! Is the winding device replaced within the specified time? It's about doing. Next, this will be explained in detail with reference to the drawings.

FIG. 1 shows the implementation of the present invention ('II), in which 10 is a hoop supply stand, 12 is a hoop, 14 is a roll forming machine, and 7-1
2) Bend the whole piece from both sides to form a U-shape, then shape it into an O-shape, that is, a tube. Reference numeral 16 denotes a welding section, in which the abutting sections of the hoops formed into tubular shapes are welded using high-frequency electric resistance welding to form a tube. Reference numeral 18 is a roll tube wire drawing machine, which draws the entire tube that has been electrically welded and reduces its diameter (reduces the diameter by 5 to 20 tmK). Cut 22 pieces of electric resistance welded pipe to the specified length using a 20 piece cutting machine. Hoop supply and welding do not stop even when cutting, so if the pipe production speed is high, cutter 2 is used.
0 is considered to be a traveling cutting type. The electric resistance welded tube 22 is sent to the winding process through the entire inclined guide vibe 24. 4. - Since the guide pipe 24 is provided at an angle, the cooling water inside the pipe 22 guided by it is removed.

In the winding process, a winding mechanism 26 and a winding device 28 are used.
is provided. FIG. 2 is an enlarged view showing these in detail. The curling mechanism 26 is a torque motor 60.
and a plurality of rows 232. Of these rollers, 32a and 32b are driven by a motor 30 to rotate the pipe 2.
It becomes a driving roller for 2. Roller 32a with 34 chain.

Sprocket 36a attached to the rotating shaft of 32b.

The hook is passed to 56b, and the rotation axis of roller 32a is connected to motor 30.
Driven by. 52c and 32d are free rollers,
The former is for bending, and the latter is for guiding. A plan view of these rollers is as shown in FIG. 3.

The bending roller 32c is attached to a shaft 38 that moves forward and backward, and is moved forward or backward by a motor 40. 42 is a sliding bearing. When the roller 32c moves forward, the driving roller 32a
f The tube 22 that comes out is bent strongly, and when it retreats, it is bent weakly. The dotted line indicates a strongly bent state.

Returning again to FIG. 1, the winding device 28 includes a turntable 46 mounted on a carriage 44. As shown in FIG.

The truck 44 is equipped with running wheels 48, which wheels 48 are transferred onto the vale 50. An L/i tin rocket 56 is mounted on the turntable 46 and is driven by a motor 52 via a chain 54 as shown in FIG. 4, which in turn rotates the turntable 46. The tube 22, which is continuously bent by the curling mechanism 26 and hangs down in a spiral shape due to its own weight, falls onto the turntable 46, and as the table rotates in a direction to tighten the spiral, it is wound up as a coil. I'm getting beaten up. As shown in FIG. 2, a guide tube or guide 46a is attached to the turntable 46, and the coil 22a is formed to surround this. That is, during this coil formation, the motor 40 is energized and the row 232c moves forward and backward repeatedly, and the tube 22 is spirally wound from the inside to the outside on the turntable 46, for example, to form the first layer. Then, it is wound from the outside to the inside to form the second layer [7, Next, it is wound from the inside to the outside to form the third layer, and the following is repeated to form an aligned coil of a predetermined height. . In Fig. 2, numeral 58 is a decelerator and a gate type that allows the entire 60-turn curling mechanism to be constructed.

In such winding, when the coil 22a reaches a predetermined height, the tube 22 is cut by the cutter 20, and the subsequent tube 22 is cut.
will be wound on another coil.

In the present invention, this processing is performed as follows. That is, when it is detected as described later that if the tube 22 between the cutting machine 20 and the winding device 28 is wound, the coil 22a will reach a predetermined height as described below, and the cutting machine 20 is activated. Suga 2
Cut 2. When ``g22'' is cut, the load becomes lighter, so the rotational speed of the torque motor 60 increases, and the tube is wound at a commercial speed. In accordance with this, the rotational speed of the drive motor 52 of the turn 7''-pull 46 is increased to rotate the table at high speed.

If the speed increase of the torque motor 30 is not sufficient, the torque applied to the motor is increased to increase the speed, and the winding speed is set to 1.5 to 6.0 times the normal welding speed.

The point at which the tube 22 is cut can be detected by the roller 32b. j411 Rotation amount of roller 32b Length of tube 22 wound around coral coil
Since the distance #l'F from to the roller 321.4- is known, the cut 19f signal may be issued when the sum of these becomes equal to the length of the coil of a predetermined size. roller 32b
The amount of rotation is determined, for example, by attaching a complete pulse generator to the roller and counting the output pulses with a counter. Also, is the output frequency of the pulse generator of this roller 32b the feeding speed of the tube 22? Shows (7, so turntable 4
The speed increase command for the drive motor 52 or its transmission of No. 6 is as follows:
It can be made from the output frequency.

When the winding speed (winding speed after cutting the pipe) is increased, the cutting part gradually opens as the rear end of the leading pipe and the tip of the trailing pipe melt. When the rear end of the leading pipe is also wound up by the winding device 28, the carriage 44 is operated and a new turntable is wound around the winding mechanism 26.
Bring it directly below.

It can be detected by the roller 32e rolling in contact with the tube 22 that the rear end of the preceding tube is also wound up by the winding device 7128. That is, the electrical contact between the roller 32e and the wire 22 is monitored during the entire winding process, and when the rear end of the tube passes the entire length of the roller 32e, the electrical contact is made at one point, thereby informing that the winding has been completed. .

The cart 44 is provided with two turntables as shown in FIG. Then, the tube 22 is wound up on the turntable 46 in the state shown in the figure, and when the coil 22a is completed, the cart 44 is moved to the right in the direction of the arrow F1, so that the new turntable 46A is placed directly under the curling mechanism 26. . IP2 indicates the feeding direction of the tube 22. 10 to 20 seconds is sufficient for this cart movement operation. The trailing tube is fed at the welding speed (normal speed). Now, cutting machine 2o
Assuming that the distance from the first pipe to the curling mechanism 26 is 50 m, the pipe forming speed is 50 m/min, and the winding speed after cutting is 100 m/min, which is twice the pipe forming speed, from the completion of winding the first pipe to the succeeding pipe. The turntable replacement described above can be easily performed since there is a time difference of 30 seconds until the tip of the tube is reached.

When the tip of the succeeding tube arrives and is caught in the curling mechanism, the rotational speed of the torque motor 50 decreases (if the applied voltage of the torque motor is also changed, the applied voltage is lowered when the turntable is replaced). Volume *b is started, but it still takes some time for the pipe 22, which has been given a winding pattern and descends in a spiral shape, to reach the turntable.
The number of turns is about 1 to 2 turns, and the length of the pipe is 3 to 10.
m), this time also contributes to the expansion of the above-mentioned time difference.

The trolley 44 is driven by a travel motor (not shown). Limit switches 62 and 64 for controlling the traveling motor are provided along the rail 50, and these switches are operated by actuators 7CJ and 72 provided on the truck 44. 6
6.68 is also a limit switch, and 74.76 is its actuator, and these are for controlling the turntable drive motor 52. In the state shown in Fig. 5, the limit switch 62
is facing the actuator 7° and is on, so when the roller 32e detects the completion of winding in this state and the control power supply (not shown) is fully closed, the traveling motor of the cart 44 moves the cart in the direction of the purple arrow F1. Start rotating in the direction of movement (this is the positive direction). As a result, the truck 44 moves in the direction of arrow F1, and the limit switch 66 separates from the actuator 74. As a result, the motor 52 drives the turntable 46.
Stop J. When the cart 44 reaches the right end and the limit switch 64 faces the actuator 72 and turns on, the movement of the cart in the direction of arrow F1 is stopped, and instead, the driving circuit for the cart in the left direction is completed. However, this circuit (The power is not turned on yet), the empty turntable 46A is connected to the curling mechanism 2.
It comes directly under 6. In addition, the limit switch 68 is
6, the motor 52 is turned on and the turntable 46 is turned on.
A′lf driving is performed. Under such control, the cart reciprocates to the left and right, and the turntables 46 and 46A are driven alternately to wind the corrugated ERW tube into a coil.
The completed coil is generally used by a turret or the like when the turntable is at rest.

As is clear from the above explanation, according to the present invention, a small diameter pipe is continuously fed and wound into a coil one after another by a single winding mechanism and a pair of winding devices that operate alternately. This has the advantage that it is possible to improve the operation rate of the equipment, and also to avoid the occurrence of welding defects and a decrease in yield.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIGS. 2 to 5 are detailed explanatory diagrams of a part thereof. In the drawing, 22 is a small diameter steel pipe, 26 is a curling mechanism, and 28 is a small diameter steel pipe.
22a is a winding device, 22a is a coil, 30 is a torque motor that drives a winding straightening mechanism, and a motor that drives all 52 winding devices. Applicant Fi Iron Welding Industry Co., Ltd.

Claims (1)

[Scope of Claims] A small diameter steel pipe that is continuously supplied is provided with a winding curl by a curling mechanism, and is wound into a coil by a winding device, and the steel pipe is cut into appropriate lengths to a predetermined size. In the method of winding small-diameter steel material to form a multi-feed coil, when the small-diameter steel pipe is completely cut, the processing speed of the curling mechanism and winding device is fully increased, and the subsequent steel pipe is rolled up after all of the preceding steel material has been wound. A predetermined amount of time until it reaches the take-up device? A continuous winding method for small-diameter steel materials, which is characterized by the fact that the winding device is replaced within the core time.