JPH02129507A - Roll gap detecting device - Google Patents

Abstract

PURPOSE:To detect an accurate roll gap by providing an air exhaust nozzle for forming an air curtain at the periphery of a sensor head. CONSTITUTION:When roll gap detectors 31 and 32 are set and work rolls 1 and 2 are rotated for rolling, air is jetted from the exhaust nozzle 45 provided at the peripheral part of the sensor framed 43 of the roll gap detectors 31 and 32. When the air is jetted from the air exhaust nozzle, the air curtain is formed between the sensor frame 43 and the outer periphery (roll surface to be measured) of the outer periphery of the shaft parts of work rolls 1 and 2 while surrounding a sensor head 44, so roll coolant water to stay on the roll measured surface can be blown away and an air layer is formed stably in the sensor frame 43. The roll gap is therefore accurately detected by the roll gap detectors 31 and 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll gap detection device used to accurately detect the roll gap of a rolling mill.

[Prior Art] A conventional rolling mill generally has a structure including upper and lower work rolls 1 and 2 and upper and lower backing rolls 3 and 4 that back up the upper and lower work rolls 12, as shown in FIG. .

In such a rolling mill, the roll gap between work rolls 1 and 2 [1
Conventionally, a position detector 6 such as a magnescale is attached to the reduction cylinder 5, which has the tip of the piston rod 5a in contact with the axle box 7 of the lower backing roll 4, and the position detector 6 detects the The roll gap H is detected by detecting the amount of movement of the piston rod 5a. However, in the case of the roll gap detection method having the above configuration, there is a problem that the detection accuracy is poor because it is affected by the deflection and eccentricity of the work rolls 1, 2 and the backing rollers 3, 4, elastic crushing of the rolls, etc.

On the other hand, in order to improve the roll gap detection accuracy, the 10th
As shown in the figure, an optical non-contact position detector 10 is attached to the axle box 8 that supports the upper work roll 1, and
A bracket 11 is attached to the axle box 9 that supports the lower work roll 2, and the position detector 10 is detected by the position detector 10.
A method for detecting the gap between the bracket 11 and the bracket 11 has been proposed.

However, in the case of this method, the O
- There is a problem in that the detection accuracy is not significantly improved due to the influence of the bending of the neck and the play of the bearings in the axle boxes 8 and 9.

Therefore, in order to solve the problems of each of the above-mentioned methods and improve detection accuracy, as shown in Japanese Patent Application Laid-Open No. 62-214812, an eddy current type A roll gap detection device has been proposed in which a non-contact roll gap detector is installed and the roll gap detector is inserted between upper and lower work roll shafts to detect the roll gap. This roll gap detection device is set so that the gap between the detection surface of the roll gap detector and the outer peripheral surface of the roll shaft, which is the surface to be measured, is constant by adjusting the opening degree of the two sensor arms. It's something.

[Problems to be Solved by the Invention] However, in the case of the non-contact type roll gap detection device, roll coolant water adheres to the detection surface of the roll gap detector or the surface to be measured, resulting in the presence of both a liquid layer and an air layer. Then, even if the actual roll gap does not change during rolling, the roll gap output of the detector changes due to the change in capacitance, and there is a problem that the roll gap cannot be detected accurately. In addition, in order to accurately detect the roll gap, it is sufficient to completely eliminate the roll coolant 1 to water between the detection surface of the roll gap detector and the measured surface of the roll, leaving only an air layer, but during rolling, the roll coolant Since it is necessary to use water, it is difficult to form a stable air layer between the detection surface of the roll gap detector and the surface to be measured of the roll.

Therefore, the present invention attempts to detect a positive roll gap by preventing roll coolant water from the outside from intervening between the non-contact type roll gap detector and the surface to be measured of the rolls. It is something to do.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a roll gap detection device equipped with a non-contact type roll gap detector in which a sensor head is installed in a sensor frame. At the periphery of the sensor frame in the gap detector,
The sensor head is provided with an air outlet for forming an air curtain around the sensor head, and the sensor frame is further provided with a liquid outlet for filling the sensor frame with fluid.

[Function] When the work roll is rotated to perform rolling, when air is ejected from the air outlet of the sensor frame, an air curtain is formed between the sensor frame and the surface to be measured of the roll to surround the sensor head. This prevents roll coolant water from entering the sensor frame and forms a stable air layer within the sensor frame.

Furthermore, when the fluid is ejected from the fluid ejection port, the sensor frame is filled with the fluid and a fluid layer is formed.

[Implementation Example 1] Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show one embodiment of the present invention, in which guide members 22 and 23 extending parallel to the rolling material progressing direction are fixed to the upper and lower parts of the inside of the housing 21. A frame 24 is slidably fitted to 22 and 23, and a rack 25 is fixed above the frame 24 in parallel with the guide member 22. A pinion 27 that can be rotated by a device 26 is engaged, and the rotation of the pinion 27 causes the frame 24 to slide in a direction parallel to the rolling material progressing direction.

Further, a horizontal pin 28 parallel to the work rolls 1 and 2 is attached to the frame 24 at a position approximately at the same height as the rolling material passing height position, and a horizontal pin 28 is attached to the horizontal pin 28 in parallel to the rolling material passing direction. A pair of scissor-shaped sensor arms 29 and 30 extending approximately parallel to each other are attached so as to be openable and closable, and a fluid pressure cylinder 33 is connected to the frame 24 in the middle of the sensor arms 29 and 30. The sensor arms 29, 30 are opened and closed using the horizontal pin 28 as a fulcrum by connecting the ends of the rods 33, 34 and extending and retracting the hydraulic cylinders 33, 34. Furthermore, the above-mentioned circular arc portions 29a and 30a are machined to have approximately the same diameter as the shaft portion diameter of the work rolls 1 and 2, and the circular arc portions 29a,
Even when the 30a is brought into close contact with the shafts of the work rolls 1 and 2, there is a gap d between the work rolls 1 and 2 as shown in FIG.
, , d2 are formed in the circular arc portions 29a, 3
Flat part 2 connected to 0a via stepped part p9b and 3ob
9c, 30c, and non-contact type roll gap detectors 31, 32 such as eddy current type or capacitance type are attached to the flat parts 29c, 30c.

The roll gap detectors 31 and 32 are a feature of the present invention, and as shown in detail in FIGS. It has a sensor head 44 that serves as a stepped detection surface, and is provided with an air outlet 45 on the periphery of the sensor frame 43 to form an air curtain around the sensor head 44. . Note that 46 is an air supply path to the air outlet 45.

Further, the frame 24 includes sensor arms 29, 3.
Brake guides 35 and 36 are fixed to the upper and lower rear end sides of 0 in parallel with the guide members 22 and 23.
．． A brake body 37 is fitted to the brake body 36 , and a rod tip of a fluid pressure cylinder 38 whose rear end is connected to the frame 24 is connected to the brake body 37 .
By extending and contracting the rod, the brake main body 37 can be moved forward and backward in a direction parallel to the rolling material traveling direction. As shown in FIG. 2, the contact surfaces of the brake guides 35 and 36 and the brake body 37 engage when the brake body 37 is pulled away from the work rolls 1 and 2. It has a slope so that it will separate when pushed in the direction approaching 2.

A stopper guide 39 having a vertically tapered hole which is larger in the upper part and smaller in the lower part is fixed to a required position in the middle of the guide member 22, and on the other hand, to the frame 24,
A stopper guide 40 having a similar tapered hole is fixedly installed to correspond to the stopper guide 39, and when the stopper guide 39.40 is made to correspond to the stopper guide 39.40 in the vertical direction, The stopper body 41 is arranged so that the wedge-shaped stopper body 41 can be fitted into the stopper body 41.
is supported by the rod tip of a fluid pressure cylinder 42 installed above the stopper guide 39 of the housing 21.

When the roll gap detectors 31 and 32 are set between the work rolls 1 and 2, the stopper body 41 is raised by the fluid pressure cylinder 42 and its lower end is placed between the stopper guides 40 and 40.
from the brake body 37 by the fluid pressure cylinder 38.
to the work roll 1.2 side to release the brake, and when the sensor arms 29 and 30 open and close, the sensor arm 29
．． The braking force is not applied to the drive device 2.
6 rotates the pinion 27 to move the frame 24 forward toward the work roll 1.2. As the frame 24 moves forward, the sensor arm 29.30 moves forward together with the frame 24 toward the work roll 1.2. At this time, the sensor arm 29.30 is moved to the horizontal pin 28 by the hydraulic cylinder 33.34. Rotate the sensor arm 29.
30 to open and close. When the sensor arm 2930 is advanced by a predetermined amount and opened and closed, the arcuate portions 29a and 30a of the sensor arms 29 and 30 come into close contact with the shaft portion of the work roll 1.2, as shown in FIG.

When the arcuate portions 29a and 30a of the sensor arms 29 and 30 are brought into close contact with the shaft portion of the work roll 1.2, the operation of the fluid pressure cylinders 33 and 34 is stopped, and the brake body 37 is moved to the work roll 1 by the fluid pressure cylinder 38. Pull the brake body 37 away from the brake guide 35.
．． 36. As a result, sensor arm 2
9.30 is fixed so as not to open or close, and the gap between the lower end of the work roll 1 and the upper surface of the roll gap detector 31 is dl.
The gap between the upper end of the work roll 2 and the lower surface of the roll gap detector 32 is set to d2.

Next, the pinion 27 is reversed to move the frame 24 back by a distance X in the direction away from the work rolls 1 and 2, and the roll gap detectors 31 and 32 are positioned in the roll gap of the work rolls 1 and 2, and the fluid pressure The stopper body 41 is lowered by the cylinder 42 and its lower end is moved to the stopper guide 4.
Insert it into 0. As a result, the frame 24 is fixed and the setting of the roll gap detectors 31 and 32 is completed.

After the roll gap detectors 31 and 32 have been set, the work rolls 1 and 2 are rotated to perform rolling. At this time, the sensor frames 43 of the roll gap detectors 31 and 32 are
Air is ejected from an air ejection port 45 provided around the periphery. When air is blown out from the air outlet 45,
Since an air curtain is formed surrounding the sensor head 44 between the sensor frame 43 and the outer periphery of the shaft portions of the work rolls 1 and 2 (roll measurement surface), the air curtain tends to be interposed on the roll measurement surface from the outside. The roll coolant water can be blown away, and an air layer is stably formed within the sensor frame 43. For this reason,
No change occurs in the capacitance of the roll gap detectors 31, 32, so that the roll gap is accurately detected by the roll gap detectors 31,32.

Next, FIG. 8 shows a further embodiment of the present invention. Sensor head 4 inside
4 is provided with a fluid spout 47 for filling the dedicated fluid.

When the roll gap detectors 31 and 32 have such a configuration,
For example, when air is ejected as a fluid from the fluid ejection port 47, the sensor frame 43 is filled with air, which prevents roll coolant water from entering from the outside between the sensor frame 43 and the surface to be measured of the roll. Furthermore, this can be prevented more reliably, and the roll gap can be detected with higher accuracy. Furthermore, when roll coolant water is jetted out as a fluid from the fluid jet port 47, the sensor frame 43 is filled with roll coolant water and only a liquid layer is formed, so that the electric capacity of the sensor head 44 changes. There is no occurrence of this, and it is possible to accurately detect the gap between the rolls.

In addition, in the embodiment of the present invention, the case where the sensor arm is shaped like cutting scissors has been explained, but the sensor arm can also be shaped like cutting scissors, and various other changes can be made without departing from the gist of the present invention. Of course, you can get it.

[Effects of the Invention] As described above, according to the roll gap detection device of the present invention, the air outlet provided at the periphery of the sensor frame of the roll gap detector creates a gap between the sensor frame and the surface to be measured of the rolls. Since an air curtain can be formed to surround the sensor head, it is possible to prevent roll coolant water from entering the sensor frame from the outside, making it possible to accurately detect the roll gap. Since the sensor frame can be filled with fluid using the fluid spout, excellent effects such as being able to detect the roll gap with higher accuracy can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the roll gap detection device of the present invention, FIG. 2 is a view taken from the ■-■ direction of FIG. 1, and FIG. 3 is a view taken from the ■-■ direction of FIG. 1. Figure 4 is IV- of Figure 1.
IV direction arrow view, FIG. 5 is an explanatory diagram when setting the roll gap detector, FIG. 6 is a cross-sectional view showing details of the roll gap detector, and FIG. 7 is the VN-VI[ of FIG. 6]. 8 is a sectional view of a roll gap detector showing another embodiment of the present invention, FIG. 9 is an explanatory diagram of an example of a conventional roll gap detection method, and FIG. 10 is a conventional roll gap detection method. FIG. 2 is an explanatory diagram of an example of a scheme. 21...Housing, 24...Frame, 29.3
0... Sensor arm, 29a, 30a... Arc part, 29b, 30b... Step part, 29c, 30c...
・Flat part, 31, 32... Non-contact roll gap detector, 35. 36... Brake, 43... Sensor frame, 44... Sensor head, 45... Air outlet, 47... ...Fluid spout. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 6 Figure 7 Figure 8

Claims (2)

[Claims] (1) In a roll gap detection device equipped with a non-contact roll gap detector in which a sensor head is installed in a sensor frame, air is placed around the sensor head in the periphery of the sensor frame of the roll gap detector. A roll gap detection device characterized by having an air jet port for forming a curtain. (2) Claim (1) wherein the sensor frame is provided with a fluid ejection port for filling the sensor frame with fluid.
The roll gap detection device described.