JPH0331446Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device for detecting the curvature of a hot bar, and in particular, a device for reliably detecting the curvature of a hot bar by bringing the curvature of the hot bar into contact with a detection rod. It is related to.

[Conventional technology]

Conventionally used hot bar warp detection devices utilize a hot bar detector (HMD) that detects warp by detecting the radiant heat of the hot bar, or a laser type projector/receiver.
Optical detection devices have been used, such as those that detect by blocking this laser light by the upward curvature.

[Problem that the invention attempts to solve]

Since the conventional hot bar warp detection device is an optical detection device as described above, it has the following problems.

Generally, radiant heat from a hot bar exists above the top surface of the hot bar, and since this radiant heat is also detected and the table roller is cooled with water, the water or steam blocks the laser light.

For this reason, even if there is no upward curvature above a certain value at the tip and tail end of the hot bar, it is erroneously detected that there is an upward curvature above a certain value.

Therefore, this warp detection device performs automatic positioning control (APC) of the inductor gap at the tip and tail end of the hot bar, and for an edge heater device that heats the edge of the hot bar by induction heating, The above-mentioned erroneous detection of upward curvature is
This causes a decrease in heating efficiency due to the widening of the inductor gap. Further, problems such as a decrease in the quality of the edge portion due to a decrease in the amount of temperature increase at the edge portion of the hot bar have occurred.

The present invention has been developed to solve the above-mentioned problems. In particular, the heating efficiency of the edge heater device can be improved by bringing the warped part of the hot bar into contact with the detection rod and reliably detecting the warp. It is an object of the present invention to provide a hot bar warpage detection device that maintains the temperature of the hot bar at a constant temperature, prevents a decrease in the amount of temperature increase at the hot bar edge portion, and stabilizes the quality.

[Means for solving problems]

The hot bar warp detection device of the present invention has a detection rod for detecting the hot bar warp suspended on a table roller in the hot bar conveying direction, and a power supply device that applies a voltage between the table roller and the detection rod. , a detection unit that emits a signal when the hot bar is bent upward and comes into contact with the detection rod.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the hot bar warp detection device according to the present invention will be described below with reference to the drawings.

Reference numeral 1 in this device is a detection rod, which is attached to a detection rod suspension plate 3 by a detection rod attachment pin 2. The detection rod 1 has a structure in which a sufficient gap is provided between the pin through hole of the detection rod 1 and the detection rod attachment pin 2 so that the detection rod 1 can freely move in an arc using the detection rod attachment pin 2 as a fulcrum.

Furthermore, a detection rod height adjustment bolt 4 is attached to the upper part of the detection rod suspension plate 3 to which the detection rod 1 is attached.

This detection rod suspension plate 3 is attached to the detection rod fixing plate 6 after the height of the detection rod 1 is adjusted using the detection rod height adjustment bolt 4 and the detection rod height adjustment nut 5. There is.

The above is the configuration of the detection rod part.

Next, the detection rod fixing plate 6 is attached to the detection rod mounting base 9 using the detection rod fixing plate attachment bolt 15. In order to electrically insulate the detection rod portion from the detection rod 1 to the detection rod fixing plate 6 and the detection rod mounting base 9, insulating plates 7 are fitted on the upper and lower sides of the detection rod fixing plate 6. . Further, the insulating tube 8 is fitted between the through hole of the detection rod fixing plate attachment bolt 15 of the detection rod fixing plate 6 and the detection rod fixing plate attachment bolt 15.

The detection rod fixing base 9 to which the detection rod portion is attached as described above is attached to the mounting frame 13 with the frame attachment bolts 12 and grounded. Further, a ribbon lead 11 is connected between the detection rod 1 and a heat-resistant wire attachment terminal block 14 provided on the detection rod fixing plate 6 so that a ground current can easily flow to the detection rod 1. Further, in order to prevent radiant heat from the hot bar 22, a heat insulating material 10 is attached to the lower surface of the detection rod mount 9.

A hot bar 22 having a plate thickness of T mm moves on a table roller 23 and enters an edge heater device (not shown).

The lower surface of the detection rod 1 of the above-mentioned upward warpage detection unit is located at a height that takes into account the amount of upward warpage (αmm) to be detected, that is, from the upper surface of the table roller 23 (T+
α) Fix at the mm position.

As the hot bar 22 advances, the warp detection rod 1 is attached to the warp part of the hot bar 22 as shown in FIG.
When it makes contact, it connects to the side terminal of the power supply device 19, and connects the relay coil section 24 of the detection unit 18, the heat-resistant wire 20, the heat-resistant wire attachment terminal block 14, the ribbon lead 11, the detection rod 1, the hot bar 22, the table roller 23, and the ground. , and from this ground, the power supply device 19 is connected via the detection rod mount 9 and the grounding wire 21.
A series of electrical circuits are constructed leading to the side terminals.

By configuring this electric circuit, a ground current flows in the circuit, and this current activates the relay of the detection unit 18. This activation signal is input to the edge heater control device 17, and the automatic Control takes place.

As described above, the warp of the hot bar can be reliably detected by detecting the flowing ground current through contact between the detection rod and the warped part of the hot bar.

〔effect〕

Since the hot bar warpage detection device of the present invention has the above-described configuration and operation, the following effects can be obtained.

To detect the warp of the hot bar, the warp of the hot bar can be reliably detected by bringing a detection rod into direct contact with the warped part of the hot bar and detecting the ground current flowing there. the result,
It is possible to maintain the inductor gap of the edge heater device at an optimal value, maintain good heating efficiency, and prevent a decrease in the amount of temperature rise at the hot bar edge, thereby preventing cracking of the edge and coarsening of the structure.
The quality of rolled products is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of the upward warp detection section, and FIG. 2 is a schematic block diagram showing the overall structure. 1...Detection rod, 2...Detection rod mounting pin, 3...
Detection rod suspension plate, 4...Detection rod height adjustment bolt, 5...Detection rod height adjustment nut, 6...Detection rod fixing plate, 7...Insulation plate, 8...Insulation tube, 9 ... Detection rod mounting base, 10 ... Insulation material, 11 ... Ribbon lead, 12 ... Frame mounting bolt, 13 ... Mounting frame, 14 ... Heat-resistant wire mounting terminal block, 15 ... Detection rod fixing plate installation Bolt, 16... Ground wire attachment terminal block, 17... Edge heater control device, 18... Detection unit, 19
... Power supply device, 20 ... Heat-resistant electric wire, 21 ... Grounding wire, 22 ... Hot bar, 23 ... Table roller, 24 ... Relay coil.

Claims (1)

[Scope of utility model registration request] In a device for detecting upward warpage at the tip or tail end of a hot bar rolled by a rough rolling mill, a detection rod for detecting upward warpage of the hot bar is suspended above a table roller in the hot bar conveying direction, and the detection rod is connected to the table roller for detection. A hot bar warp detection device comprising a power supply device that applies voltage between the hot bar and the hot bar, and a detection unit that emits a signal when the hot bar warp comes into contact with the detection rod.