JPH031140Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is used in the production line of electric resistance welded pipes, in which a long flat plate is conveyed and wound into a cylindrical shape, and the joints are welded to form a pipe. The present invention relates to a bead removal device for electric resistance welded pipes.

(Prior art) Various efforts have been made to speed up the line and improve the quality of the pipes in the electric resistance welded pipe manufacturing line, and on the other hand, there is an increasing demand for the production of thicker pipes (steel pipes). .

The key to speeding up the above-mentioned ERW pipe production line lies in the cutting process of the cutting machine that cuts the pipe to a predetermined length, but servo motors are used as cutting machines for high-speed production lines. Press-type cutting machines and disc cutter cutting machines are generally used, and in the case of the above-mentioned thick-walled steel pipes, the disc cutter cutting machines are often used.

On the other hand, in terms of pipe quality, pipes are required to be free of weld beads on both the inner and outer surfaces.

Conventionally, for the outer surface of the weld bead, a method has been used in which the bead portion is cut with a bar cutter and the cut bead is wound up in a winder and recovered, and this does not cause any particular problems.

It is also necessary that the inner bead be taken out before shipping, especially since the inner bead gets entangled with the cutting tool when it is placed on a chamfering device that chamfers the cut end of the pipe. Become.

However, there is no effective means for removing the inner bead in the ERW pipe manufacturing line, and when a press-type cutting machine is used, the inner bead is also cut, but the inner bead remains inside the pipe. Depending on the shape of the cut end of the pipe, it becomes extremely difficult to remove the bead.

In addition, when using a disc cutter cutting machine, the inner bead cannot be processed at all, so
The bead is manually cut by an operator using scissors, and even in this case, the cut bead still remains inside the pipe and must be removed.

(Problem to be solved by the invention) Conventionally, in order to remove the inner bead remaining in the pipe as described above, pressurized air is blown into the pipe from one end, and the bead is placed on the airflow and removed from the pipe. A method is used to discharge the liquid from the other end.

However, discharging the beads using the above-mentioned pressurized air requires a large amount of air, and if the cut end of the pipe is deformed, the beads often get caught and cannot be discharged, so it is difficult to ensure that they are removed from the pipe. The problem was that I couldn't do it.

(Structure of the invention) (Means for solving the problems) In order to solve the problems of the above-mentioned prior art, in the present invention, a flat plate is rolled into a cylinder while being conveyed, and the joints are In an ERW pipe manufacturing line where pipes are formed by welding, there is a transport path that transports the pipe cut to a predetermined length by a cutting device in the line, and a transport path that is perpendicular to this transport path. a bead removal mechanism disposed to fix the position, a bead mooring magnet for mooring the bead is embedded near an intersection of the conveyance path surface of the conveyance path where the bead removal mechanism intersects, the bead removal mechanism , a bead engaging pawl that is exposed between the pipe that has been cut and remains on the pipe manufacturing line and the pipe that is left on the pipe manufacturing line, and that pushes the bead along the pawl path in a direction perpendicular to the bead; The bead engaging claw has a drive mechanism that reciprocates from a position in front of the intersection point to a bead removal position beyond the intersection point, and the lower end of the bead engaging claw is attached to the arm member that is reciprocated by the drive mechanism. A claw-closing roller that protrudes above the passage and is pivoted so as to sink into the claw passage when it is collapsed, and is tilted in the claw passage on the ejection side for folding down the bead engaging claw when it moves back, is installed just before the return position. Each pawl path is provided with a pawl raising cam that raises the bead engaging pawl, and the cut bead is bent into a U-shape by the bead engaging pawl while being pushed to the discharge position and removed. It is characterized by the following.

(Embodiments) The present invention will be described below with reference to embodiments shown in the drawings.

The pipe conveyance path 1 includes conveyance means such as rollers 2, 2, etc., which convey a pipe P manufactured by winding a flat plate material in a pipe production line and cut into a predetermined length by a cutting device in the line. However, a bead removal mechanism 3 is provided in the middle of this conveyance path 1 so as to intersect therewith.

Four guide pins 5, 5, . Magnets 6, 6 as bead mooring means are embedded in one surface.

As shown in FIG. 2, the bead removing mechanism 3 moves a bead pushing claw 8 along a claw path 7 provided orthogonally to the pipe conveying path 1 from a position (a) in front of the intersection 4 to a bead removal position. It is provided so that it can be moved back and forth over the range up to (b) by means of a driving means.

In the illustrated embodiment, an air cylinder 9 is used as the driving means.
The lower end of the pushing claw 8 is attached to the tip of an arm 10 connected to the rod 9A of the arm 10 so as to be able to fall only forward by a shaft 11, and a thinking spring 12 is hung between the pushing claw 8 and the arm 10. Thus, the pushing pawl 8 is held in either the upright position or the forward position. When the pushing claw 8 is in an upright state, the tip of the pushing claw 8 protrudes above the upper surface of the claw passage 7, and when it is collapsed, it is located on the same level as the claw passage 7 or below it.

The lower end of the bead pushing claw 8 hits the claw passage 7 immediately before the return position (a) of the bead pushing claw 8, and the spring 1
A claw raising cam 13 for resisting 2 and returning to a standing posture
is provided.

In the pawl passage 7 on the bead discharge side from the intersection 4,
A pawl tilting roller 14 is provided for abutting the back of the pushing pawl 8 and causing it to fall down when the pawl 8 returns.

This claw-down roller 14 is supported by a support arm 16 whose one end is pivotally supported on the machine body 15 side and is swingably supported.
A rod of an air cylinder 17 is connected to this support arm 16, and when the air cylinder 17 is operated, it is swung over a range from the position shown by the solid line to the position shown by the chain line in FIG. During the return stroke of the bead 8, the roller 14 descends, and the back surface of the bead pushing pawl 8 comes into contact with the roller 14, causing it to fall down.

In the illustrated embodiment, a bead shredder 18 for shredding beads is connected to the end of the claw passage 7. This bead shredding machine 18 includes a shredding blade holder 20 rotatably provided in a casing 19 by a shaft 21, a blade 22 attached to the tip of the shredding blade holder 20, and a blade 22 fixedly installed in the casing 19. The fixed blade 23 shears the bead fed into the casing 19 into small pieces.

There is a hopper 24 at the lower end of the casing 19,
Directly below the opening of this hopper 24, a container 25 for collecting the shredded beads is placed.
is said to be removable.

For cutting pipes, for example, see Figures 3 A to D.
This is done in the steps shown below. That is, when the pipe P is started to be cut by the disc cutters 26, 26, etc. arranged around the pipe P, the pipe gap detection means 27 is detected.
The detection roll 28 and the pinch roll 30 of the rapid feed mechanism 29 are lowered, and the disc cutters 26, 26...
When the cutting of the pipe P is completed, the pinch roll 3
Pipe where 0,31 is rotated at high speed and remains on the line side
There is a gap between the cut end surface and P' (FIGS. 3B to C).

As a result, the detection roll 28 falls within the interval, and the air cylinder 33 of the bead cutter 32 is activated.
The movable blade 32A descends and the fixed blade 32B and the movable blade 3
The inner bead is cut at the edge with 2A (FIG. 6D).

After cutting the bead, the pipe P on the line side is fed a predetermined length, and is cut again by the disk cutters 26, 26, . . . . In the figure, B indicates a bead.

Next, the operation of the above embodiment will be explained in conjunction with FIG. 4.

The inner bead B of the pipe P cut to a predetermined length to be fed through the pipe conveyance path 1 has been cut and separated from the inner surface of the pipe P in the previous process, and is separated from the rear end of the pipe P fed through the pipe conveyance path 1. The bead B is transported with part of it protruding.

When the pipe P reaches the intersection 4, it is attracted by the magnets 6, 6, but since the pipe P is fed by the rollers 2, 2, it overcomes the attraction force and advances.

However, the bead B protruding from the rear end of the pipe P is attracted to the magnets 6, 6, is left behind from the pipe P, and is placed lying across from the upstream side to the downstream side of the intersection 4 (the fourth Figure A).

At this point, the air cylinder 9 of the bead removing mechanism 3 is extended, and the bead pushing claw 8 moves to the left in FIG. Press the middle part of B in the longitudinal direction (Fig. 4B). At this time, intersection 4
Since the left and right sides of the bead B hit the left and right guide pins 5, 5 on the exit side of the bead B, the bead B is bent into a U shape (Fig. 4C) and is fed as it is to the casing 19 of the bead shredder 18. (Fig. 4D).

When the feeding of the bead B is finished and the air cylinder 9 enters the shortening operation, the pawl knocking roller 14 is moved to the lowered position by the operation of the air cylinder 17, and the back of the bead pushing pawl 8 in the return stroke is moved to this pawl. It comes into contact with the folding roller 14 and is folded forward, and the folded-forward posture is maintained by the spring 12.

After passing the intersection 4, the lower end of the bead pushing claw 8 hits the cam 13 of the claw passage 7 just before the home position, and the bead is returned to the upright position.

The illustrated embodiment shows a case where the bead pushing pawl 8 is operated by an air cylinder 9, and since the air cylinder 9 performs reciprocating movement, a pawl knocking roller 14 and a pawl raising cam 13 are provided. However, if this pushing pawl 8 is fixed to an endless chain and moved forward along the pawl passage 7 when pushing the bead, and returned along the lower surface of the pawl passage 7 when returning, the provision of the pawl knocking roller 14 etc. is not necessary. do not have. Also, the bead mooring means may be other than the magnets 6, 6, for example, by a clamping tool.

(Effects of the invention) As described above, according to the invention, there is a conveyance path for rapidly transporting the pipe cut to a predetermined length by a cutting device in the pipe production line, and a A bead removal mechanism is disposed perpendicularly to the bead removal mechanism to fix the position, and a magnet for bead mooring is embedded in the vicinity of the intersection of the conveyance path surface with the bead removal mechanism, and the bead pushing claw of the bead removal mechanism is used to move the bead into the pipe. Since the middle part of the bead attracted by the magnet is pushed forward and bent into a U-shape, it is pushed to the ejection position and removed, so the bead can be removed more reliably than when blowing out with pressurized air. Even if the shape of the cut end of the pipe is distorted or curled, it can be easily removed. In addition, since the beads are attracted to and moored by the magnet on the conveyance path, the posture of the beads is not disturbed when pushed by the bead engaging claw of the bead removal mechanism, and the longitudinal center of the beads is reliably pushed and pushed to the removal position. In addition, the bead engaging claws are designed to stand up when the bead is pushed forward and fall down when the bead is retreated.
The bead removal mechanism can be reciprocated across the conveyance path, and the removal mechanism can be provided in a fixed position, so the overall structure of the device can be made compact without becoming complicated. There are various effects.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a side view of the same, Figs. 3 A to D are explanatory diagrams showing an example of the pipe cutting process, and Figs. It is an explanatory diagram showing a removal operation. 1... Pipe conveyance path, 3... Bead removal mechanism, 4
...Intersection, 5...Guide pin, 6...Magnet as bead mooring means, 7...Claw passage, 8...
Bead pushing claw, 12... thinking spring, 13... cam for raising the claw, 14... claw pushing roller, 18... bead shredding machine.

Claims (1)

[Scope of utility model registration request] In an ERW pipe production line where flat plates are transported and wound into a cylindrical shape, and the joints are welded to form pipes, the pipes are cut to a predetermined length by a cutting device in the line and then transported in fast forward motion. and a bead removal mechanism disposed in the middle of the conveyance path orthogonally to the bead removal mechanism to fix the position.
A bead mooring magnet for mooring the bead is buried in the vicinity of the intersection of the conveyance path surface with the bead removal mechanism, and the bead removal mechanism separates the pipe that is cut from the preceding pipe and the pipe that remains on the pipe manufacturing line. a bead engaging pawl that pushes the exposed bead along the pawl path in a direction perpendicular to this, and a bead engaging pawl that moves the bead engaging pawl from a position in front of the intersection to a bead removal position beyond the intersection The lower end of the bead engaging claw is raised to an arm member reciprocated by the drive mechanism so that it protrudes above the claw path when standing up and sinks into the claw path when falling down. The nail passageway on the ejection side is pivotally mounted to allow the bead engagement to fall down, and the pawl path on the discharge side includes a pawl tilting roller that lowers the bead engaging pawl when it moves back, and the pawl passage just before the return position includes a pawl raising roller that raises the bead engaging pawl. A bead removal device for an electric resistance welded pipe, characterized in that the cut bead is bent in a U-shape by a bead engaging claw and pushed to a discharge position to be removed.