JPH0429444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plug dropout detection device in a piercer.

A piercer is a rolling mill that makes holes in round steel pieces and widens the holes in the production of seamless pipes. The main parts of a typical piercer consist of two perforating rolls, a plug supported at the tip of the mandrel bar, and a guide shoe that prevents the tube from bulging between the rolls during piercing. A plug is pressed against a steel piece, and the round steel piece is formed into a hollow tube using perforated rolls and the plug.

By the way, in a piercer, the plug is subject to severe wear and needs to be replaced frequently. Therefore, the plug is detachably supported on the mandrel bar. Due to this, in very rare cases, the plug may fall off from the mandrel bar.
If the piercer is operated under such conditions, there is a risk that the piercer will be rolled without a plug, the mandrel bar will be thrown off, and the surrounding equipment may be destroyed.Also, even if the piercer is stopped before then, The work of removing the plug from the shell of the round steel piece becomes extremely complicated.

Therefore, conventionally, before the plug is pressed against the round steel piece, an operator visually confirms whether the plug is attached to the mandrel bar. However, such monitoring has the risk of misidentification and has also hindered the automation of piercers.

This invention was made in order to solve the above-mentioned problem, and it is installed near the entrance on the mandrel bar insertion side of the piercer body, facing the movement path of the mandrel bar.
an ITV camera, a flash light installed near the ITV camera and facing the movement path of the mandrel bar, and a strobe means for causing the flash light to emit light in response to a strobe activation signal; position confirmation means for confirming the position of the attached plug and outputting the strobe activation signal when the plug is located within the field of view of the ITV camera; a memory that stores image information captured by an ITV camera; an image processing circuit that determines the presence or absence of a plug based on the image information stored in the memory and outputs an alarm signal when the presence of the plug cannot be confirmed; It is characterized by consisting of an alarm activated by a signal.

The present invention will be described below with reference to embodiments and drawings.

FIG. 1 is a diagram conceptually showing the arrangement of a piercer and a detection device of the present invention, and FIG. 2 is a block diagram of the detection device.

This invention irradiates a running plug in a piercer with a flash light of strobe means,
An ITV camera (industrial television camera) captures a still image of the plug, processes it to determine the presence or absence of the plug, and activates an alarm if the plug has fallen off the mandrel bar. This is what I did.

The piercer 1 includes two barrel-shaped perforating rolls 3 on a piercer body 2, and a thrust block 4 at an appropriate distance from the piercer body 2. The thrust block 4 holds the base end of a mandrel bar 5, and a plug 6 is attached to the tip of the mandrel bar 5. And in this piercer 1,
As the thrust block 4 moves from the position shown by the solid line in FIG. 1 (standby position), the plug 6 moves.
It is conveyed to the position shown by the two-dot chain line in FIG. 1, where it abuts against the end face of the round steel piece 7 that has been force-fed between the punching rolls 3, and is held at that position. on the other hand,
The round piece of steel 7 is subsequently forced to the left in FIG. 1 and is formed into a hollow tube by means of a plug 6 and perforated rolls 3. When the drilling operation is completed in this manner, the thrust block 4 is retracted and the plug 6 is removed from the hollow tube. This hollow tube is then kicked out onto the back table. In addition,
In FIG. 1, reference numeral 8 designates a cooling box, which cools the plug 6 at its standby position.

As shown in FIG. 1, the plug dropout detection device 10 includes an ITV camera 11 installed near the insertion side entrance of the mandrel bar 5 of the piercer body 2 and facing the movement path of the mandrel bar 5;
It has a flashlight 12 installed near the mandrel bar 5 and facing the movement path of the mandrel bar 5, and a speed sensor 13 installed opposite the thrust block 4.

The speed sensor 13 constitutes a position confirmation means 15 together with the CPU 14, and this position confirmation means 1
5 detects the speed of the thrust block 4 detected by the distance sensor 13, that is, the speed of the plug 6, and calculates it in the CPU 14 based on the detected speed.
The time when the plug 6 reaches the field of view of the ITV camera 11 is determined, and the CPU 14 outputs a strobe operation signal 14a and a memory command signal 14b at that time.

ITV camera 11 is connected to memory 16,
A video output signal 11a is output to the memory 16.

The flash light 12 is a strobe drive circuit 1
7, constitutes a strobe means 18,
A strobe drive circuit 17 is activated by a strobe activation signal 14a from the CPU 14, and the flashlight 12 emits light.

The memory 16 is operated by a memory command signal 14b from the CPU 14, stores image information captured by the ITV camera 11, and stores the image memory signal 16.
a is output to the image processing circuit 19.

The image processing circuit 19 processes the image information stored in the memory 16 and determines the presence or absence of the plug 6 and the presence or absence of the plug 6.
The presence or absence of a flaw 6a on the surface is determined, and if the plug 6 is not attached to the mandrel bar 5 or if there is a flaw 6a on the surface of the plug 6, an alarm signal 19a is output. In such image processing, for example, image information stored in the memory 16 is binarized using a certain set value, and a judgment is made based on the pattern obtained thereby.

The alarm signal 19a is input to the alarm device 20, which activates the alarm device 20 to issue an alarm using a buzzer, light, or the like.

Further, the image processing circuit 19 is connected to a monitor television 21.
The image information signal 19b is also output to the monitor TV 2.
1 shows the pattern processed by the image processing circuit 19.

Therefore, in the plug dropout detection device of the present invention, the tip of the mandrel bar 5 is connected to the ITV camera 11.
When the flash light 12 enters the field of view, the flash light 12 emits light, and in synchronization with this, the memory 16 stores a still image of the mandrel bar 5. Image processing is performed based on the still image, and the tip of the mandrel bar 5 is When the plug 6 is not attached or when a flaw is confirmed on the surface of the plug 6, an alarm is issued and the operator is notified.

In addition, in the embodiment described above, the position confirmation means 15
For example, a speed sensor 13 and a CPU 14 are employed, but a switch operated by the thrust block 4 is installed at the position where the thrust block 4 reaches when the plug 6 enters the field of view of the ITV camera 11, The strobe drive circuit 17 and memory 16 are controlled by the output signal of the switch.
may be activated.

Further, in the embodiment described above, the image processing circuit 19 is provided separately from the CPU 14, but if the image processing is performed by the CPU 14, the image processing circuit 19 may be omitted.

As explained above, in the present invention, the disconnection of the plug in the piercer is automatically detected,
Since the operator is notified by an alarm, there is no risk of an accident due to non-rolling of the plug, and the complicated work associated with it can also be avoided.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing the arrangement of a piercer and a detection device of the present invention, and FIG. 2 is a block diagram of the detection device. In the diagram, 1...piercer, 2...piercer body, 3...
Perforation roll, 4... Thrust block, 5... Mandrel bar, 6... Plug, 7... Round steel piece, 1
0...detection device, 11...ITV camera, 12...
...Flashlight, 13...Speed sensor, 14
... CPU, 15 ... position confirmation means, 16 ... memory, 17 ... strobe drive circuit, 18 ... strobe means, 19 ... image processing circuit, 20 ... alarm device, 21 ... monitor television.

Claims (1)

[Claims] 1 Installed near the entrance on the mandrel bar insertion side of the piercer body, facing the mandrel bar movement path.
an ITV camera, a flash light installed near the ITV camera and facing the movement path of the mandrel bar, and a strobe means for causing the flash light to emit light in response to a strobe activation signal; position confirmation means for confirming the position of the attached plug and outputting the strobe activation signal when the plug is located within the field of view of the ITV camera; a memory that stores image information captured by the ITV camera; an image processing circuit that determines the presence or absence of a plug based on the image information stored in the memory and outputs an alarm signal when the presence of the plug cannot be confirmed; and an image processing circuit that outputs an alarm signal when the presence of the plug cannot be confirmed. A device for detecting plug removal in a piercer, comprising: an alarm activated by a signal.