JPS60127025A - Roll diameter detecting device of rolling mill - Google Patents

Abstract

PURPOSE:To save labor and time for regulating work and to ensure the safety of work in a ultrasonic roll diameter detector by replacing a drain board for preventing flowing in of coolant adhering on the surface of the roll to an ultrasonic probe with a fluid jetting nozzle. CONSTITUTION:The nozzle 14 is placed in the upstream side of direction of rotation of a roll 1 to be measured to the position of mounting the ultrasonic probe 3. When measuring the roll diameter, the probe 3 is moved parallelly to the axial direction of the roll while spouting jet stream 15 of high pressure, high- speed water, air etc. from a nozzle 14 in the direction reverse to the direction of rotation of the roll and at a proper angle to the surface of the roll during rotation of the roll 1. At this time, the jet stream 15 blows off a coolant 8 such as water etc. adhering on the surface of the roll 1 and prevents sucking of air into water flow for measurement in the gap 9 between the probe 3 and roll 1 and prevents turbulence of the water flow. Accordingly, it becomes possible to detect an accurate gap chi stably at all times. High accuracy of mounting of the nozzle 14 is not required, and regulating work due to wear is not necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an ultrasonic type detection device among roll diameter detection devices for a rolling mill.

Generally, in a plate rolling mill such as a hot rolling mill, the work rolls of the machine wear locally only in the parts where they contact the rolled material, so in order to roll a plate with a normal thickness distribution, the rolling order of the rolled material must be changed. Is it necessary to transition from wide to narrow width?
Therefore, at present, most rolling mills fully adopt such rolling order regulation.

However, the rolling order regulation based on the width of the strip is an extremely large factor that hinders productivity, and there is a strong (and growing) demand for eliminating this factor.

Therefore, as a measure to eliminate such restrictions on the rolling order, a so-called on-line roll grinding means has been proposed in which the surface of a work roll is ground to a desired profile while the work roll is installed in a rolling mill stand. A typical example of this type of grinding means is to push a grinding body such as a grindstone onto the surface of the roll while rotating the work roll, and to move the work roll in parallel to the axis of the roll to grind the work roll to the desired size. Devices for profile grinding are known. In order to obtain the required roll flow with high accuracy when carrying out such online roll grinding, the outer diameter of the roll to be ground must be accurately detected before, after, or during grinding, and the surface flow of the roll must be fully understood. This is essential.

Non-contact type detectors are often used as roll diameter detection devices for this purpose, but here we specifically use ultrasonic type detectors. We will explain about the roll diameter detection device.

FIG. 1 is an explanatory diagram of a hot rolling mill in which, for example, a conventional ultrasonic roll detection device is used for an upper work roll 1. As shown in the figure, an ultrasonic probe 3 is housed in a sealed case 2 disposed at an appropriate interval from the roll 1 so as to face the roll 1 at an appropriate interval xi. This is mounted on a support beam (not shown) so as to be freely movable in parallel in the roll axis direction (perpendicular to the plane of the paper), and is connected to a time interval measuring device 5 via a converter 4.

Further, a nozzle hole 6 is provided on the surface 2a of the case 2 on the roll l side.
A water supply lower for measurement is formed on the other surface, and the case 2 is connected to a fresh water supply source having pressurizing means such as a pump (not shown) via the water supply lower for measurement.

When measuring the roll diameter with this detection device, water for measurement is spouted from the nozzle hole 6 while rotating the roll 1 at an appropriate speed to detect the gap 9 between the probe 3 and the roll 1.
When the probe is immersed in water and excited by the transducer 4, the ultrasonic waves are reflected on the surface of the roll 1 and return to the probe 3 through the measuring water flow. When the time difference between the transmitting pulse output and the receiving pulse output of the converter 4° is detected by the total time interval measuring device 5 as shown in FIG. gap xf can be detected. Here, ■ is the speed of sound in water.

Therefore, the diameter of the roll 1 can be determined from the value of It can be measured.

On the other hand, in a hot rolling mill or the like, the surface of the roll 1 is normally cooled by jetting a coolant 8 such as water during rolling, so the roll diameter is detected with the coolant 8 adhering to the surface of the roll 1. Often. In this case, when the rotational speed of the roll 10 becomes <1, the coolant 8 adhering to the surface of the roll 1 collides with the measuring water flow at the gap portion 9 as shown in FIG. flows into. At this time, surrounding air is drawn in and bubbles are generated in the water flow in the sales gap portion 9.

However, once air bubbles are generated, the ultrasonic waves are reflected at the air bubbles, resulting in misdiagnosis of the gap X being extremely small, and at the same time, the ultrasonic waves are diffusely reflected at the air bubbles, reducing the stiffness of the waves received by the transducer 4. However, a problem arises in that it becomes impossible to generate a received pulse, and the gap X cannot be detected.

Therefore, the present inventor first proposed a roll diameter detection device that can solve the above problem. This will be explained based on FIG.

FIG. 3 is an explanatory drawing including a cross section of the ultrasonic probe portion of the present detection device. The same members as in FIG. As shown in the figure (with respect to the mounting position of the ultrasonic probe 3 which is housed in the water passage case 2 and can freely move parallel to the axial direction of the roll 1 (direction perpendicular to the page) on a support beam (not shown), roll 10
A drain plate 10 is fixed on the case 2 via a bracket 11 on the upstream side of the rotation direction 2 (in the illustrated example, above the probe 3), and the drain plate 10 is integrally connected to the probe 3 along the roll axis. It is configured to be able to move freely in parallel in the direction. The drain plate 10 is made of a soft material that will not damage the surface of the roll 1 even if it comes into contact with the surface of the roll 1, which is made of materials such as rubber, plastic, and non-ferrous metals. Between the surface of the roll 1, the draining plate 10 is attached to the surface of the roll 1.
There is a slight gap that can be touched. Further, the tip of the drain plate 10 on the roll 1 side forms a wedge, and the drain plate 10
is installed at an appropriate inclination angle α (preferably α is an acute angle) with respect to the surface of the roll 1, and its length and width (in the roll width direction) are such that the coolant 8 adhering to the surface of the roll 1 is at least is determined so as not to obstruct the measurement water flow t in the gap 9 between the probe 3 and the roll 1. Also, the draining plate 10 is attached to a plurality of bolts 1 so as to be freely inserted into and taken out from the roll 1 side.
2 and is fitted into the groove 13 of the bracket 11.

If this device is used according to the same procedure as shown in FIG. 1
Since the water is scraped by zero, the measuring water flow in the gap 9 between the probe 3 and the roll 1 is not disturbed, and the surrounding air is not caught in the water flow in the gap 9. Therefore, as in the device shown in Fig. 1, there is a misdiagnosis of the gap X due to the reflection of ultrasonic waves at the air bubbles, that is, the diameter of the roll 1, a decrease in the received wave intensity due to diffuse reflection at the air bubbles, and the detection of the gap X. This eliminates problems such as failure, and as a result, it becomes possible to always accurately and stably detect the roll diameter and roll profile.

However, the outer diameter of the draining plate 1 (1; l) of this device decreases due to wear of the tip end due to long-term use and wear of the roll 1 as rolling progresses, and the gap between the draining plate 10 and the roll 1 decreases. Therefore, each time, it is necessary to manually loosen the mounting bolts 12, pull out the draining plate 10, and accurately adjust the gap between the roll l and the draining plate. There is.

However, since the location where the drain board is installed is extremely narrow in relation to peripheral equipment, the adjustment work requires considerable effort and time, and is not only undesirable from the standpoint of work safety. This is causing problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll diameter detection device for a rolling mill that solves the above problems. To achieve this object, the present invention includes all nozzles 14 installed on the upstream side of the rotational direction 2 of the roll 1 with respect to the position of the probe, and a high-pressure, high-speed jet water stream or air stream is injected onto the surface of the roll 1. The technical concept of the present invention is based on the fact that the surface is touched and the surface is blown away.Hereinafter, an actual example of the present invention will be explained in detail based on all the drawings. Note that the same members as those in the conventional device are given the same reference numerals and redundant explanations will be omitted.

FIG. 4 is an explanatory diagram including a cross section of an ultrasonic probe according to an embodiment of the present invention. Is it housed in the case 2 as shown on the supporting shaft beam (not shown)? A nozzle 1 is installed on the upstream side (in this case, above the probe 3) of the roll rotation direction 2 of the ultrasonic probe 3, which can freely move in parallel in the axial direction of the roll 1.
4 is connected to a fresh water source or air source having a pressurizing means such as a pump (not shown), and a jet stream 15 of high-pressure, high-speed jet water or air stream is generated in the opposite direction to the rotational direction 2 of the roll 1. , and spray the coolant 8 such as water on the roll surface at an appropriate angle (preferably an acute angle) β1 to blow off the coolant 8 such as water attached to the roll surface, and measure the gap 9 between the probe 3 and the roll 1. In order to prevent air from getting into the water flow and turbulence of the water flow (bracket 1
It is fixedly installed on the case 2 via the probe 6, and is configured to be able to move in parallel with the probe 3 in the roll axis direction.

When measuring the entire diameter of the roll using the device of this embodiment, a high-pressure, high-speed jet 15 is injected from the nozzle 14 during 10 rotations of the roll, and the probe 3vf-
By moving parallel to the roll axis direction, it is possible to always stably and accurately detect the gap X, and a highly accurate roll diameter and profile can be obtained. That is, the jet 15
As a result, the measuring water flow in the gap 9 between the probe 3 and the roll 1 can be measured without being disturbed by the cooler 7) 8 and without any air bubbles being accumulated, so there is always no diffuse reflection of ultrasonic waves. Ultrasonic pulses can be received and transmitted under normal conditions.

Furthermore, in the drain plate method shown in FIG.
However, since the nozzle 14 is a member that functionally corresponds to the drain plate 10 in the device of this embodiment, its mounting accuracy is rougher than that of the drain plate 10. As the roll diameter changes or the drain plate 10
This eliminates the need for adjustment work for wear and tear, contributing to savings in labor and work time as well as ensuring work safety.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be modified in various ways without departing from the spirit of the present invention.

As specifically explained above in conjunction with the embodiments, according to the present invention, the drain plate is installed on the roll surface on the upstream side in the rotational direction of the roll to be measured relative to the mounting position of the ultrasonic probe. In the water flow for measuring the gap between the child and the roll.
It is possible to prevent the entrainment of \ and disturbance of the measuring water flow, and to detect the roll diameter with extremely high accuracy.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a roll diameter detection device according to a conventional example;
The figure shows the time difference between the transmitting pulse output and the receiving pulse output of the converter, FIG. 3 is an explanatory diagram of another roll diameter detecting device according to the conventional example, and FIG. 4 is an explanatory diagram of the roll diameter detecting device according to the present invention. It is a diagram. In the drawing, 1 is a roll, 2 is a water passage case, 3 is an ultrasonic probe, 4 is a transducer, 5 is a time interval measuring device, 8 is a coolant, 9 is a gap part, 14 is a nozzle, and 15 is a jet stream , X is the gap. Patent Applicant Mitsubishi Heavy Industries, Ltd. Sub-Agent Patent Attorney Shibu Mitsuishi (and 1 other person) Figure 7 Figure 4 Continued from page 1 0 Inventor Hiroaki Tsutsu Shima Hiroshima Research Institute, Kannon Shinmachi, Nishi-ku, Hiroshima City ] Inventor Shu Hisashi Miyaguchi 4-6-n, Kannon-Shinmachi Hiroshima Shipyard, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd. 4-6-n Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] In a rolling mill roll diameter detection device that makes full use of ultrasonic waves,
1. A roll diameter detection device for a rolling mill, comprising a nozzle that supplies a jet stream toward the roll surface on the upstream side in the rotational direction of the roll to be measured relative to the mounting position of the ultrasonic probe.