JPS5835770B2 - Thickness gauge between stands in continuous rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention proposes a completely new thickness meter that is capable of measuring the thickness of a rolled material between the stands of a continuous hot rolling mill.

FIG. 5 suggests a conventional continuous hot rolling mill (with a 6-stand configuration).

Each stand F1. The thickness of the strip, which is the rolled material, on the exit side of F2 to F6 is extremely important as rolling control data at each stand.

However, in general, a thickness gauge (for example, an X-ray thickness gauge) TH is installed only in the final stand F6 to actually measure the exit side thickness h6, and then the thickness h6 of the exit side is measured only in the final stand F1. Output side thickness hi of F2 to F5
(i=1, 2...5) is calculated according to the so-called constant mass flow equation, and is used as rolling control data.

That is, provided that VRi r Roll circumferential speed vR6 of the i-th stand: Roll circumferential speed fi of the 6th stand F6: Advancement rate f6 of the i-th stand: Advancement rate of the 6th stand Thickness hi1 thus obtained That is, the mass flow gauge uses circumferential measurement, which naturally has a large error, and there is a problem in that the accuracy of plate thickness control cannot be increased beyond a certain level.

To solve this problem, it is sufficient to place a thickness gauge between the stands and actually measure the thickness of the strip at the exit side of each stand. Several attempts have been made to do this, but the installation space is limited, The structure is unreasonable due to the need for protection against the impact caused by the contact of the strip, and furthermore, it is difficult to correct for fluctuations in the loop angle of the strip, so it has not been put into practical use. .

The present invention has been made in view of such circumstances, and has a structure in which a radiation detector or a radiation generating means is housed in a hollow roll that contacts the rolled material, and the thickness of the rolled material between the stands is actually measured. The present invention will be described in detail below with reference to drawings showing embodiments thereof.

FIG. 1 is a schematic diagram of a thickness gauge according to the present invention that uses X-rays as radiation.

In the figure, Fi is the first stand or intermediate stand of the continuous hot rolling mill, Fj is the adjacent intermediate stand on the downstream side, and the strip ST is rolled by these stands and moves in the direction of the white arrow. I will do it.

RR is a looper roll disposed between the stands Fi, and has the same structure as a known one and is arranged in the same manner.

The thickness gauge according to the present invention includes a hollow roll 1 disposed between a stand Fi and a looper roll RR so as to be in rolling contact with the upper surface of a strip ST moving between stands Fi and Fj.
, an X-ray generator 2 is installed opposite to the hollow roll 1 below the strike IJ tube moving area to project X-rays toward the hollow roll 1, and an X-ray generator 2 is installed inside the hollow roll 1 to capture the X-rays. An X-ray detector 3 is provided.

Reference numeral 4 denotes a presser roll disposed between the looper roll RR and the stand Fj so as to be in rolling contact with the upper surface of the strip ST, and the contact between the hollow roll 1 and the strip ST is prevented due to the follow-up delay of the loopers including the looper roll RR. Prevents uncertainty.

The hollow roll 1 and the presser roll 4 are positioned so that the strip moves approximately horizontally from the stand Fi to the hollow roll 1 and from the presser roll 4 to the stand Fj.

Note that, contrary to FIG. 1, the hollow roll 1 and the X-ray generator 2 may be arranged on the downstream side of the looper roll RR, and the presser roll 4 may be placed on the upstream side, or the presser roll 4 may be omitted. It is possible.

Further, the hollow roll 1 and the X-ray generator 2 may be turned upside down.

The X-ray generator 2 is similar to the X-ray generating section of a known X-ray thickness gauge.

The X-rays projected from this X-ray generator 2 are sent to the strip ST
The light then reaches the X-ray detector 3 through the peripheral wall of the hollow roll 1, which has a constant thickness over the entire circumference.

The amount of X-rays captured by this X-ray detector 3 is the value obtained by subtracting the amount of attenuation determined by the thickness of the IJ tube ST and the thickness of the peripheral wall of the hollow roll 1 from the amount of X-rays projected by the X-ray generator 2. There is.

The X-ray detector 3 outputs the captured X-ray dose as a voltage signal to an adder 5 provided outside the hollow roll 1.

This adder 5 is supplied with a set value adjuster 6 to detect X-rays when a measurement object having a reference thickness is placed between an X-ray generator 2 and an X-ray detector 3 facing each other via the peripheral wall of the hollow roll 1. Vessel 3
A reference signal corresponding to the voltage signal emitted by the Outputs a signal corresponding to the deviation from the reference thickness.

The output signal of the adder 5 is amplified by a deviation amplifier 7, and the deviation is displayed by a deviation indicator 8.

The thickness of the strip is the standard thickness and the indicated deviation (positive or negative)
Of course, it can be found as the sum of

This deviation (or the strip thickness, which is the sum of the standard thickness) is determined by the control circuit for controlling the rolling position of stands Fi and Fj, as well as the entire hot continuous rolling mill consisting of stands Fi, Fj, etc. It is input to a process control computer that handles control.

Next, the hollow roll 1 will be explained in detail.

Figure 2 is its implied front view, Figure 3 is its implied plan view,
FIG. 4 is an enlarged side cross-sectional view taken along line IV--IV in FIG. 3.

A continuous hollow roll support member 11 is fixed at an appropriate length above the strip ST movement area, and the base end is pivoted on both sides of the support member 11 to enable vertical movement within a certain angle range. An arm 12A protruding toward the downstream side of the stand Fj,
The shaft end of the hollow roll 1 is rotatably supported at a position near the tip of the roll 12r using a bearing (not shown).

The hollow roll 1 has a large diameter at the central part where it should be brought into contact with the strike IJ tube ST, and has a small diameter at both shaft ends to be supported by the arms 12A and 12r, and the diameter is reduced toward the shaft ends between these parts. It is tapered.

The shaft end supported by the arm 12r is solid and closed, whereas the shaft end supported by the arm 12A' has a beam insertion hole 1b communicating with the central cavity 1a.
is formed, and is open at its shaft end surface.

An L-shaped auxiliary arm 13 is fixed to the outer surface (the side not facing the arm 127) at approximately the center of the arm 121, which is L-shaped in plan view.

The auxiliary arm 13 has a part perpendicular to the arm li and a part perpendicular to the arm 1
21 and extending in the direction of the distal end of the arm 121, and is fixed perpendicularly to the opening of the beam insertion hole 1b in the latter part facing the opening of the beam insertion hole 1b. A detector support beam 14 is provided that extends and is inserted near the center of the detector.

The detector support beam 14 is made of a pipe material having an outer diameter smaller than the diameter of the insertion hole 1b, does not contact the circumferential surface of the insertion hole 1b, contacts the strip ST, and does not interfere with the rotation of the hollow roll 1 due to its movement. That's how it is.

15 is an air cylinder, and arm 1 of support member 11
The base end of the cylinder portion 15a is rotatably mounted at a position slightly closer to the hollow roll 1 than above the pivot point of the arm 12r on the side surface of the arm 12r.

A rod 15b protrudes from the distal end side of the cylinder portion 15a, and the distal end of the rod 15b is pivoted at a suitable location between the pivot point of the arm 11 and the fixed point of the auxiliary arm 13 on the upper surface of the arm 12A'. and the cylinder part 5
By supplying compressed air into the chamber a, the rod 15b is advanced from the cylinder portion 15a, and the arm 121 is pressed and rotated downward to press the hollow roll 1 against the upper surface of the strip ST.

An X-ray detector 3 is attached to the tip of the detector support beam 14 located within the cavity 1a of the hollow roll 1.

The X-ray detector 3 consists of an ionization chamber or the like in a known X-ray thickness meter, and its output signal is transmitted to the detector support beam 14.
The data is input to the adder 5 outside the hollow roll 1 through a cable 16 inserted through the inside of the roll.

Note that in the X-ray detector 3, the hollow roll 1 is connected to an air cylinder 15.
When the strip ST is in a position where it is restricted to move horizontally by the operation of the It is fixed to the support beam 14.

11 in the map is a cable for feeding power to the X-ray generator 2.

The apparatus of the present invention configured as described above operates the air cylinder 15 in synchronization with the threading to bring the hollow roll 1 into pressure contact with the strip ST, and also operates the X-ray generator 2.
By driving the circuits such as the X-ray detector 3, the strip ST becomes capable of measuring the thickness of the strip ST.

That is, the X-rays projected by the X-ray generator 2 toward the strip ST and the hollow roll 1 above are transmitted to the X-ray detector 3 which is directly opposed to the X-ray generator 2 by the action of an air cylinder.
The X-ray detector 3 outputs a voltage signal corresponding to the amount of captured X-rays to the adder 5, so the deviation amplifier 7 outputs this voltage signal and the set value adjuster 6 in advance. The deviation of the strip to be measured from the reference thickness based on the set reference signal is output over time, and the strip thickness is measured or the plate thickness is controlled based on this.

During this time, since the hollow roll 1 rolls, the strip ST is guided by the hollow roll 1, the looper roll RR, and the presser roll 4, and moves smoothly.

Such a product of the present invention requires a space (approximately 1 m in length in the strip movement direction) to install the hollow roll 1, the arms 127, 12r for supporting it, and the support member 11, etc. It is possible to use the existing continuous hot rolling mill without changing the layout of the existing continuous hot rolling mill, as it only needs to be secured for the purpose of the present invention. There's no need to.

Furthermore, the installation of the product of the present invention does not have any effect on the movement of the rolled material.

Furthermore, since the X-ray detector is protected by a hollow roll, there is no risk of it being damaged.

Furthermore, since the moving range of the rolled material is restricted by hollow rolls and the X-rays are transmitted vertically through the rolled material, there is no need to consider corrections due to variations in the loop angle of the rolled material, and the signal processing system is It may be similar to a normal X-ray thickness gauge.

In the above embodiments, the case where X-rays are used as the radiation is described, but it is also possible to use other radiations such as β-rays. Of course, the radiation detector may be placed inside the hollow roll, and the radiation detector may be placed outside the hollow roll.

As described above, the present invention solves all the conventional problems and realizes a thickness gauge that can be installed between the stands of a continuous hot rolling mill. It becomes possible to grasp the thickness of the rolled material as an actual measurement value up to the final stand.

Therefore, according to the present invention, it is possible to dramatically improve the accuracy of plate thickness control in a continuous hot rolling mill, and the present invention can truly be called an epoch-making invention in this type of measurement technology or control technology.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of the product of the present invention, FIG. 2 is a schematic front view of a hollow roll, FIG. 3 is a suggested plan view thereof, and FIG. 4 is a schematic diagram of the product of the present invention. FIG. 3 is an implied enlarged side sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a model diagram of a general continuous hot rolling mill. 1...Hollow roll, 2...X-ray generator, 3...X-ray detector, 4...Press roll, 5... - Adder, 6... Set value adjuster, 1... Deviation amplifier, 8... Deviation display, 12A, 12r... Arm, 14.・・・
...Support beam, 15...Air cylinder.

Claims (1)

[Claims] 1 Hollow rolls arranged between stands of a continuous hot rolling mill to make rolling contact with the rolled material moving between the stands, and rays arranged opposite to each other via the peripheral wall of the hollow rolls and across the rolling material movement area. Equipped with a generating means and a radiation detector,
An inter-stand thickness gauge characterized in that either a radiation generating means or a radiation detector is disposed within a hollow roll.