JPS6026127Y2 - Cooling nozzle position detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a nozzle position detection device for controlling the nozzle position in order to prevent shape deformation during forced cooling of a heated steel pipe.

Previously, the applicant filed Japanese Patent Application No. 50-28511 (Japanese Patent Application No. 50-28511)
No. 5-8566) proposed and disclosed a cooling device for heat-treated steel pipes.

That is, in a continuous cooling heat treatment apparatus for steel pipes having cooling nozzles arranged to surround a steel pipe moving in the direction of the pipe axis, a mechanism for detecting bending of the steel pipe is provided, and a calculation mechanism and a cooling nozzle are connected to the detection mechanism. This cooling device has a gap adjustment mechanism between a steel pipe and a cooling nozzle, which is composed of a movement transmission mechanism and a cooling nozzle movement mechanism.

In this case, the detection mechanism is not specified, as it may be a contact type or a non-contact type.

Therefore, various types of detection ends are normally used as non-contact types in which they directly contact or are very close to the surface of the steel pipe.

However, problems arise when the detection end is disposed close to the surface of these steel pipes.

In other words, since the heating furnace type is induction heating, a strong electromagnetic field is generated near the heating, which may affect the accuracy of the detection end, and may be subject to thermal shock or mechanical shock. There are various adverse environmental conditions such as atmospheric problems, and it is necessary to perform highly accurate detection under these conditions.

Therefore, the inventors of the present invention have proposed a nozzle position detecting device that is practically free from any problems even under the above-mentioned adverse environment.

The key point of the present invention is that the sensor position as a detection end is not located near the steel pipe surface, but the position is indirectly detected at a position remote from the steel pipe surface via a long rod.

The feature is that one end of the long position detection rod has a roller that contacts the outer surface of the steel pipe, and the other end is provided with a target plate made of a good conductor, which is placed perpendicularly toward the axis of the steel pipe. The pipes are arranged horizontally and/or vertically so that they are held in place.

Sensors are disposed at such positions that the movement strokes of the target plates in the direction in which they move in accordance with the positional deviation of the steel pipe form an appropriate gap.

Hereinafter, a detailed explanation will be given with reference to FIG. 1 based on an example.

FIG. 1 is a conceptual diagram of a cooling device equipped with a nozzle position detection device of the present invention.

1 is a steel pipe to be heat treated, 2 is an outer cooling nozzle, and 3 is a nozzle moving device that holds the outer cooling nozzle 2 and moves it in vertical and horizontal directions.

In this case, as the thickness of the steel pipe to be heat treated increases, cooling will occur from the inner surface, but this is not shown in the figure.

Reference numeral 4 denotes a position detecting rod, one end of which is in contact with the steel pipe to be heat treated via a roller 5, and the other end of which is a target plate 6 made of a good conductor.A sensor 7 is placed at an appropriate distance from the target plate. ing.

From the sensor 7, the change in position is converted into an electrical signal and sent to the preamplifier 8. The signals from each pair of horizontal and vertical sensors are converted by the calculator 9 into a signal corresponding to the change in position and sent to the external nozzle. The position indicator 10 gives an instruction, and the nozzle movement control device 11 performs follow-up control to keep the positions of the nozzle and pipe constant.

In the figure, if the relative position of the pipe 1 and the external cooling nozzle 2 deviates from the proper point, for example, when the pipe moves to the right, the gap between the target plate 6 and sensor 7 on the right side decreases, and the gap between the target plate 6 and sensor 7 on the left side decreases. increases.

After this is amplified by the preamplifier 8, the displacement of the pipe axis can be measured by extracting the difference between the two signals.

Depending on the amount of displacement, the nozzle position control device performs a correction operation to return the relative position of the outer surface cooling nozzle and the pipe to the original proper point.

This relationship is the same for the upper and lower parts.

Further, in terms of improving detection accuracy, it is preferable to add detection not only at horizontal and vertical positions, but since this complicates the apparatus, it is preferable to use two-axis positions, horizontal and vertical.

The fact that the position detection rod was set between the pipe body and the sensor, and that the sensors were installed in pairs at symmetrical points at each position, has great significance in terms of the detection system.

That is, in the former case, by arranging the position detection rod, the sensor can be placed at a certain distance from the pipe body, so that the influence of radiant heat, strong electromagnetic field, and high humidity atmosphere on the sensor can be alleviated.

In addition, since the sensors are arranged in symmetrical positions and the differences between them are taken, various error factors are canceled out, and highly accurate position detection is possible.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a nozzle position detection device according to the present invention. 1... Steel pipe to be heat treated, 2... Outer surface cooling nozzle, 3... Nozzle moving device, 4...
・Position detection rod, 5... fielder, 6...
...Target board, 7...Sensor, 8...
...Preamplifier, 9... Arithmetic unit, 10...
... Nozzle position indicator, 11 ... Nozzle movement control device.

Claims (1)

[Scope of utility model registration request] A device for detecting the relative position between a cooling nozzle and a cooling nozzle arranged to face the pipe surface of a heat-treated steel pipe moving in the pipe axis direction, which has a roller in contact with the outer surface of the steel pipe at one end and a roller at the other end. A long position detection rod having a target plate made of a good conductor is disposed perpendicular to the axis of the steel pipe so as to hold the pipe horizontally and/or vertically, and the target plate is moved. A cooling nozzle position detection device characterized in that sensors are arranged at appropriate intervals in each direction.