JPH0732570U - Plate speed measuring device for cold rolling mill - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a strip speed measuring device for a cold rolling mill that can completely remove rolling oil on the strip and accurately measure the strip speed, and facilitate scrap piece removal work. . [Structure] A plate speed measuring device arranged on the inlet side and / or the outlet side of a rolling roll of a cold rolling mill, which comprises two rolls 11a and 11b for positioning the height of a strip 2 and these two rolls. The optical plate speed meter 7 arranged below the rolls 11a and 11b, the optical plate speed meter 7 and the rolls 11a and 11b
The protector 8 is provided between 11b and has a hole 8a through which the laser light of the optical plate speedometer 7 can pass, and a cylinder 9 for driving the protector 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical plate speed measuring device which is installed in a cold rolling mill and measures the speed of a cold steel strip (hereinafter referred to as “strip”).

[0002]

[Prior art]

 In recent years, the market demand for strip quality has increased. In particular, defective strip thickness accuracy is becoming a major factor in the occurrence of troubles in the production lines such as press lines and punching lines.

In recent years, a strip speed meter used for cold rolling measures the strip speed by projecting an electromagnetic wave or the like onto the strip surface, detecting the reflected electromagnetic wave, and utilizing the principle of the Doppler effect. Contact optical plate velocimeters have come into practical use.

The conventional plate speed meter has a problem in measurement accuracy, and it is difficult to apply it to automatic plate thickness control (hereinafter referred to as “AGC”). However, this non-contact optical plate speed meter is put into practical use. This made it possible to implement mass flow AGC and to manufacture strips with a uniform plate thickness over the entire length.

As shown in FIG. 2, in strip rolling, the change in strip width of the strip 2 rolled by the rolls 1a and 1b is so small that it can be neglected. Holds the relationship of Equation 1 below.

[0006]

[Formula 1] h ₀ × Vm ₀ = h ₁ × Vm ₁ Vm ₀ : Roll entrance side plate speed Vm ₁ : Roll exit side plate speed h ₀ : Roll entrance side plate thickness h ₁ : Roll exit side plate thickness

Therefore, the strip roll outlet side plate thickness h₁To manage Vm₀, Vm₁, H ₀ Should be controlled. Therefore, in strip rolling, the plate thickness h on the roll inlet side is ₀ Is, for example, a radiation type plate thickness gauge, and the roll inlet side plate speed Vm₀And roll exit side plate speed Vm₁Is measured by the non-contact optical plate speed meter described above, and feedback control is performed to measure the plate thickness h on the roll outlet side.₁To improve the strip thickness accuracy.

On the other hand, the automation of strip processing has been rapidly promoted due to labor saving, and further improvement of the plate thickness measurement accuracy, that is, the accuracy of the mass flow AGC is required to cope with the automation.

Therefore, in order to further improve the measurement accuracy of the plate speedometer, a plate thickness meter that measures the plate thickness of the strip, and a plate thickness correction circuit that corrects the speed measurement error using the output of the plate thickness meter A speedometer provided with is proposed in JP-A-62-126378.

[0010]

[Problems to be solved by the device]

 For example, in a tandem rolling mill, as shown in FIG. 3, a plate thickness gauge 5 for measuring the plate thickness of the strip 2 is arranged between a housing 3 and a housing 4 which are continuously installed. Therefore, the position where the speedometer proposed in Japanese Patent Laid-Open No. 62-126378 can be installed is limited to the position A in the housing 3 like the conventional speedometer. Incidentally, 6 in FIG. 3 is a guide for the strip 2.

As shown in FIGS. 4 (a) and 4 (b), the plate speed meter 7 installed at the position A in the housing 3 is provided between the positioning rolls 11 a and 11 b of the strip 2 and the strip 2 A protector 8 is installed between the plate speedometer 7 and the strip 2 to protect the plate speedometer 7 from scrap pieces generated when the strip 2 breaks.

Further, in a cold rolling mill, rolling oil is generally used to carry out rolling work, so rolling oil splashes are scattered at position A in the housing 3 in FIG. This situation causes an error in the speed measurement of the strip. Therefore, in the rolling mill, a draining roll 12 that holds the strip 2 in a sandwiched state with the roll 11a is installed at a position upstream of the roll 11a to remove the rolling oil remaining on the surface of the strip 2; Rolling oil may adhere to the surface of the strip 2 between the plate 12 and the plate speed meter 7.

The rolling oil adhering to the surface of the strip can be completely removed by spraying compressed air or the like onto the surface of the strip 2. However, for example, in a high-speed rolling machine where the roll exit side plate speed reaches 1000 mpm. It is impossible to remove the rolling oil left on the strip surface by jetting compressed air or the like.

When a trouble such as breakage of the strip 2 occurs, scrap pieces remain between the drainage roll 12 and the protector 8. However, the distance a between the plate speed meter 7 and the surface of the strip 2 depends on the accuracy of the plate speed measurement. Because of the small size, it is difficult to remove the scrap pieces mentioned above, which is a safety issue.

In view of the above-mentioned problems, the present invention provides a cold rolling mill that completely removes rolling oil on the strip, enables accurate strip speed measurement, and facilitates scrap piece removal work. An object is to provide a plate speed measuring device.

[0016]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a strip speed measuring device of a cold rolling mill according to the present invention is a strip speed measuring device arranged at an inlet side and / or an outlet side of a rolling roll of a cold rolling mill. Two rolls that position the height of the optical plate, an optical plate speed meter disposed below these two rolls, and an optical plate speed meter installed between the optical plate speed meter and the roll. It is composed of a protector having a hole through which the laser beam of the meter can pass and a slide mechanism for driving the protector.

[0017]

[Action]

 The plate speed measuring device of the cold rolling mill according to the present invention comprises two rolls for positioning the height of the strip, an optical plate speed meter disposed below these two rolls, and the optical plate. It consists of a protector installed between the speedometer and the roll, which has a hole through which the laser beam of the optical plate speedometer can pass, and a slide mechanism that drives the protector. The strip speed is measured with an optical plate speedometer so that the laser light passes through the hole formed in the protector, and the slide mechanism is activated during non-measurement such as when trouble occurs, and the optical plate speedometer is operated with the protector. Protect.

[0018]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 (a) is a front view showing the structure of a strip speed measuring device for a cold rolling mill according to the present invention, and FIG. 1 (b) is a side view.

In the drawing, 11a and 11b are rolls for positioning the strip 2, and by these rolls 11a and 11b, a plate speed meter 7 installed below the strip 2 between the rolls 11a and 11b. Keep a constant distance from strip 2. The plate speed meter 7 is covered with a protector 8 for preventing water droplets from adhering when it is not measured, and during measurement, the plate speed meter 7 is thrown from the plate speed meter 7 by the forward / backward movement of the rod 9a of the cylinder 9 connected to the protector 8. The protector 8 is moved along, for example, a guide (not shown) so that the emitted laser light and the reflected laser light can pass through the hole 8a. The roll 11b may use the work roll of the next stand. The rolls 11a and 11b may be tension meter rolls that detect rolling tension.

The strip speed measuring device of the cold rolling mill according to the present invention has the structure as described above. During the rolling operation, the strip speed meter 7 moves against the strip 2 moving on the rolls 11a and 11b. Then, the moving speed of the strip 2 is measured by passing the laser beam through the hole 8a of the protector 8. At this time, since the roll 11a also serves as a draining roll, the rolling oil adhering to the strip 2 is removed, and the strip 2 located immediately above the plate speedometer 7 serves as a water-prevention plate, so that the influence of water riding is affected. The moving speed of the strip can be measured in a stable state without being affected.

When the strip 2 is broken or when the strip 2 does not exist on the rolls 11a and 11b, the cylinder 9 is actuated to cover the laser light projecting portion and the light receiving portion of the plate speedometer 7 with the protector 8 and roll it. The plate speed meter 7 is protected from oil and scrap pieces. The operation of the cylinder 9 may be performed manually or by a control signal from the rolling mill.

By the way, in the conventional strip speed measuring device for the cold rolling mill, there was a case where the rolling oil remained on the surface of the strip in the low-speed rolling region, and therefore the measurement failure rate was the same as that in the same region. However, in the strip speed measuring device of the cold rolling mill of the present invention, the above-mentioned conventional drawbacks are eliminated, so that the detection failure occurrence rate is reduced to almost 0%.

[0023]

[Effect of device]

 As explained above, in the strip speed measuring device of the cold rolling mill of the present invention, the strip speed meter projects the laser beam to the back surface of the strip and measures the strip moving speed from the reflected laser beam. Since the roll removes the rolling oil adhering to the strip, and there is no rolling oil adhering to the backside of the strip while the strip travels from the roll to the plate speedometer, the strip speed meter can accurately measure the strip. Can measure the moving speed.

Further, when the strip is broken, the plate speedometer is protected by a protector, and when scrap pieces are removed, a space where no equipment exists above the roll for positioning the strip is formed. Therefore, it is easy to remove scrap pieces.

[Brief description of drawings]

FIG. 1 (a) is a front view showing the structure of a strip speed measuring device for a cold rolling mill according to the present invention, and FIG. 1 (b) is a side view.

FIG. 2 is a diagram showing a state of a strip before and after rolling.

FIG. 3 is a view showing a position where a plate speed meter can be installed in a rolling mill.

FIG. 4 (a) is a front view showing the configuration of a conventional strip speed measuring device for a cold rolling mill, and FIG. 4 (b) is a side view.

[Explanation of symbols]

 2 Strip 7 Plate speed meter 8 Protector 9 Cylinder 11a Roll 11b Roll

Claims (1)

[Scope of utility model registration request] 1. A plate speed measuring device arranged on the inlet side and / or the outlet side of a rolling roll of a cold rolling mill, comprising two rolls for positioning the height of a strip and a space between these two rolls. An optical plate speedometer disposed below the optical plate speedometer, a protector installed between the optical plate speedometer and the roll and having a hole through which laser light of the optical plate speedometer can pass, and the protector are driven. A strip speed measuring device for a cold rolling mill, comprising a slide mechanism.