JPH039903Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for avoiding plate joints in a strip material in a pipe making process.

FIG. 1 shows an example of the pipe making process. As shown in the figure, the uncoiler 1 has a strip material 2.
is installed in a coil shape, and then along the traveling direction of the strip material 2, a plate edge detector 3, a plate joining device 4 that connects the strip material 2 by spot welding etc., a tension pinch roller 5, and a plate joining device are installed. A hoop cage 6 for storage, a hoop guide 7, a leveler stage 8 for leveling the board, a hoop guide 9, a guide roll 10,
A forming roll group 11 consisting of horizontal rolls and vertical rolls that gradually roll the strip material 2 into a tubular shape, an edge heating device 12 that heats the edge of the tubular shape, and presses and welds the heated tubular material to form a complete circular tube. Squeeze roll 13, cooling device 14, bead cutting device 15 that cuts the bead that protrudes outside the tube after welding and finishes the outer circumference of the tube into a uniform curved surface, shapes the tube into a perfect circle and shapes the tube to the specified dimensions. It consists of a sizing roll group 16 consisting of horizontal rolls and vertical rolls, and a cutting machine 17 that cuts the length of the pipe into a predetermined length.

Therefore, in the pipe making process, the strip material 2 is
The material is rolled up in the width direction to form a tube as shown in FIG.

However, in the above-mentioned structure, it is necessary to overlap and connect the strip material 2 using the plate splicing device 4 when performing continuous pipe production in terms of work efficiency. It has the following disadvantages. In other words, since the plate joint is formed by overlapping plates and spot welding, the bead cutting device 15 at the subsequent stage is
Cutting force changes dramatically when bead cutting due to cutting, and there is a risk of cutting the pipe due to the cutting tool biting in, and there is also a risk of chipping. If the conditions are not met, a closed tubular body may not be formed, and molten metal may flow into the pipe in the plating device in the subsequent process, or the cutting machine 1 may not be able to form a closed tubular body.
There is a risk that the cutting blade may be damaged when using No. 7.

For this reason, the lifespan of related parts such as the bead cutting device 15 and the cutting tool of the cutting machine 17 is extremely short. Therefore, in order to avoid this short life, the current situation is to perform intermittent operation for each hoop material, reducing production efficiency.

Therefore, in view of the above-mentioned drawbacks, the present invention aims to provide a device for avoiding plate joints in the pipe-making process, which extends the life of related parts such as bead cutting equipment and cutting machines, and improves pipe-making production efficiency through continuous operation. purpose.

In order to achieve this purpose, the present invention includes a plate joining device, a leveler stage, a squeeze roll, a cooling device,
In a pipe manufacturing process that includes a bead cutting device, a group of sizing rolls, and a cutting machine in this order, a sensor is provided at the leveler stage to detect the joining part of the strip material, and counting is started by the output of this sensor. and a second counter, and the sizing roll group is provided with a line speed detector that sends a counting signal to the first and second counters;
An operating device is provided that sends a cutting avoidance signal to the bead cutting machine at a constant count value of the second counter, and a timer that releases the cutting avoidance after a certain period of time from this cutting avoidance signal. The invention is characterized in that a cutting avoidance signal is sent to the cutting machine.

An embodiment of the present invention will now be described with reference to FIG. Note that in FIG. 3, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanations are omitted. The leveler stage 8 narrowed by the hoop guides 7 and 9 is equipped with a sensor 18 for detecting the plate joint part of the strip material 2, and is connected to the sensor 18 by detecting the plate joint part by this sensor 18. controller 1
A detection signal is output from 9. Controller 19
The output from is sent to the first counter 20 and the second counter 21,
It is possible to start counting 1.

On the other hand, a group of sizing rolls 16 for pipe shaping
A line speed detector 22 is provided at the final stage of the line speed detector 22, which is comprised of, for example, a pulse pickup that outputs pulses in accordance with the number of rotations of the roller. The signal from this line speed detector 22 is input to the first counter 20 and second counter 21 described above, and pulses corresponding to the line speed are counted. When the first counter 20 counts a predetermined number of pulses, a cutting avoidance signal is input from the counter 20 to the bead cutting device 15. This bead cutting device 15
consists of an operating device 15a, a bead cutting machine 15b, and a cutting tool 15c, and in response to a cutting avoidance signal based on the count of the first counter 20, the cutting tool 15c is raised to interrupt bead cutting. The count value of the first counter 20 is transferred to the bead cutting device 15 at the leveler stage 8.
Since the detected point in time is set at the time when the plate joint is reached, the bead cutting avoidance of the cutting tool 15c is to allow the plate joint to pass through without being cut. Further, the cutting avoidance signal of the first counter 20 is also output to the timer 23, and after a certain period of time after the cutting avoidance signal is output, the operating device 15a is activated to start the cutting tool.
5c is lowered so that bead cutting can be performed again. As a result, bead cutting is not performed at the plate joining portion of the strip material 2.

Line speed detector 22 at second counter 21
When the number of pulses from the second counter 21 is counted by the set value, a cutting avoidance signal is sent from the second counter 21 to the cutting machine 17. Since the set value of the second counter 21 is adjusted to the time taken for the plate joint to reach the cutting machine 17, cutting is postponed when the plate joint passes through the cutting machine 17. This rejected pipe material is then discharged as a defective product. After this discharge, the cutting machine 17 automatically returns. In this way, the pipe product has no plate joints.

In addition, the sensor 1 for detecting the plate joint part of the strip material 2
As 8, a capacitance type proximity switch or an eddy current flaw detector is used.

As explained above, according to the present invention, bead cutting is avoided only at the plate joint part of the strip material,
Since cutting of the pipe where the plate joint exists is avoided, there will be no chipping of the bead cutting tool, there will be no damage to the cutting blade of the cutting machine, and there will be no damage to the cutting blade of the cutting machine. The bead cutting device and cutting machine can be used for a long time without clogging the pipe, and the pipe making machine can perform stable and highly reliable continuous pipe making, improving production efficiency.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of a conventional pipe-making process, with Figure 1 being a block diagram, Figure 2a being a block diagram showing an overview of pipe-making from a strip material, and Figure 2b being a squeeze FIG. 3 is an enlarged block diagram of the roll, and is a block diagram showing an embodiment of the plate joint part avoidance device in the pipe manufacturing process according to the present invention. In the drawing, 8 is a leveler stage, 15 is a bead cutting device, 17 is a cutting machine, 18 is a sensor, 20 is a first counter, 21 is a second counter, 22 is a line speed detector, and 23 is a timer.

Claims (1)

[Scope of utility model registration request] In a pipe manufacturing process that includes, in order, a plate splicing device, a leveler stage, a squeeze roll, a cooling device, a bead cutting device, a sizing roll group, and a cutting machine, a sensor is provided in the leveler stage to detect a plate spliced portion of a strip material, The first counting starts with the output of this sensor.
and a second counter, and the sizing roll group is provided with a line speed detector that sends a count signal to the first and second counters, and when the constant count value of the first counter is detected, the bead cutting machine An operating device for sending a cutting avoidance signal to the cutting machine and a timer for canceling the cutting avoidance after a certain period of time from this cutting avoidance signal are provided, and the cutting avoidance signal is sent to the cutting machine at a constant count value of the second counter. Device for avoiding plate joints in pipe processes.