JPS5820307A - Hydraulic rolling-down cylinder for rolling mill - Google Patents

Abstract

PURPOSE:To provide a hydraulic rolling-down cylinder which reduces the rate of diminishing an effective area of hydraulic pressure and equips a sensor having the whole length reduces, by providing a fixing part of the sensor in proximity to the outer circumference of a movable part of the sensor at the outside of a body to be made movable. CONSTITUTION:In the inside of a movable body 1, a self-alignment bearing 10 is set on the center line of the body 1; a sensor body, of which one end is supported by the bearing 10 and the middle part is elastically supported by an oil chamber 8 and a seal 4, and to the other end of which a magnetic scale rod 4 is attached. The scale rod 4 is penetrated through a fixed body 2 to protrude its tip from the outside of the body 2, and a magnetic head 6 is arranged at the outside of the body 2 to detect a moved position of the rod 4. Accordingly the whole length of a sensor holding device is reduced, and the diam. of the hydraulic cylinder is reduced because the rod 4 is supported by a rod-shaped body 13 having a small exclusive sectional area.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic reduction cylinder for a rolling mill, and more particularly to a mounting structure for a position detector for detecting the position of a movable body of a hydraulic reduction cylinder that adjusts the amount of roll reduction.
In general, abrasion, roughness, etc. occur on the surfaces of reinforcing rolls and work rolls of a rolling mill due to rolling.

Since these wear and surface roughness deteriorate the finishing quality of the rolled material, the roll surface is repeatedly ground every time the roll wear progresses to a certain extent. This roll grinding amount reaches 150 to 200M in the vertical direction, so in order to roll with a constant pass line, the stroke of the roll reduction amount is also 15M.
0~200■ Necessary roar. However, for example, in the case of a cold rolling mill, the maximum thickness of a rolled material is about 6w, and the amount of change in roll reduction during sheet thickness control is ±1- or less. From this, if only during rolling is considered, the sensor stroke of the position detector (hereinafter referred to as sensor) that detects the position of the movable body of the rolling cylinder may be approximately 10 m+.

By the way, in order to perform good rolling, the detection accuracy of the sensor must generally be maintained at a high accuracy of several microns to several tens of microns over the entire long stroke of 200 microns. Therefore, a sensor holding device was proposed that would prevent errors from occurring due to the inclination of the movable body of the reduction cylinder, etc. (Japanese Patent Publication No. 50-35
9'02).

FIG. 1 is a diagram showing a conventional hydraulic pressure reduction cylinder equipped with a device for detecting the vertical position of a cylinder movable body.

The movable body odor of the cylinder is slidably inserted into the fixed body 2. A magnetic scale rod 4 is mounted inside the movable body 1 on the center line by a pivot 3. This magnetic scale rod 4 is housed in a circular tube 5. A magnetic head 6 is attached to the inner wall of the circular tube 5 in close proximity to the outer periphery of the magnetic scale rod 4, and is supported by a pivot 7 at the bottom of the circular tube 5, and is movable by the hydraulic pressure of an oil chamber 8. 1 moves, the magnetic scale rod 4 moves in the axial direction accordingly,
This movement is detected by the magnetic detector 6, and the vertical position of the movable body 1 is detected.゛Pivot 3 above
．． 7 and the circular tube 5 are sensor holding devices to prevent measurement errors from occurring due to tilting of the movable body 1. However, the length of the conventional sensor retaining device with such a configuration is three times as long as the stroke of 150 to 200 mm.
Moreover,...

Due to its long length, it has the disadvantage of reducing the effective area of pressure reduction. Therefore, a sensor holding device is desired that has a short overall length and does not reduce the effective area of pressure reduction.

It is an object of the present invention to provide a hydraulic reduction cylinder for a rolling mill equipped with a senna that eliminates the above-mentioned drawbacks, reduces the effective area of the reduction hydraulic pressure, and has a shortened overall length.

The present invention installs a spherical cleaning bearing within the cylinder movable body of a hydraulic pressure reduction cylinder and within a section area where the cylinder movable body and the movable body (fixed body) slide, and supports this bearing. The sensor movable part is attached to the other end of the rod-shaped body, and the rod-shaped body and the sensor movable part are arranged so as to penetrate through the movable body.
Furthermore, a sensor for detecting the position of the movable body of the reduction cylinder is constructed by providing a sensor fixing part on the outside of the movable body in close proximity to the outer periphery of the sensor movable part to detect the movement of the sensor movable part. It is something.

Hereinafter, an embodiment of a hydraulic reduction cylinder for a rolling mill according to the present invention will be described with reference to FIG. 2, using the same reference numerals for the same parts as in the conventional example.

Figure 2 shows a cross section of a hydraulic pressure reduction cylinder with a built-in sensor, in which the movable body 1 of the cylinder that supports the metal chock 9 and adjusts the roll gap is in sliding contact with the fixed body 2 of the cylinder. There is. A tiltable alignment bearing 10 is installed inside the movable body 1 on the center line. A spring 11 is loaded between the bottom of the alignment bearing 10 and the inner wall of the movable body 1, and presses the alignment bearing 10 downward to stop its lifting. A retainer 12 for fixing the bearing portion is installed on the outer peripheral side of the front surface.

This alignment bearing 10 is attached so that the ninth rod-shaped body 13 attached to the seven-pin moving part is inserted into the inside of the fixed body 2. A magnetic scale rod 4, which is a movable part of the sensor, is attached to the end of the rod-shaped body 13 on the side of the fixed body 2 so as to penetrate through the fixed body 2. A magnetic head 6, which is a fixed part, is arranged.

A rod-shaped body 1 connecting the movable body 1 and the magnetic scale rod 4
3 is supported at one end by the alignment bearing 10, and the middle part is elastically supported by oil in an oil chamber 8 formed in the fixed body 2 and a seal 14 of this oil, and the direction of movement thereof is is on the center line of the fixed body 2.

Since the alignment bearing 10 is arranged on the center line of the movable body 1 within the sliding section area, which is the center of tilting, even if the movable body tilts, there is no tilting to the magnetic scale rod 4 and magnetic head 6. This prevents the effects of Of course, the movable body 1 slides within the fixed body 2 by the hydraulic pressure in the oil chamber 8, and the roll gap is adjusted via the metal chock 9. At this time, the magnetic scale bar 4 moves with the movement of the movable body 1, and the magnetic head 6 captures this movement to detect the vertical position of the movable body 1 in the cylinder. At this time, a sensor holding device consisting of a tiltable centering bearing 10 and a rod-shaped body 13 is provided so that errors in the detected elevation and position of the movable body 1 do not occur due to the inclination of the movable body 1.

According to this embodiment, an alignment bearing 10 is installed inside the movable body 1 on its center line, one end is supported by this alignment bearing, and the middle part is provided with an oil chamber, 8 oil and a seal 14 to provide elasticity. A magnetic scale rod 4 is attached to the other end with a drop ff, and the magnetic scale rod 4 is passed through the fixed body 2 so that its tip protrudes outside the fixed body 2, and the magnetic scale rod 4 is moved. By installing the magnetic head 6 for detecting the position on the outside of the fixed body 2, the extra length of the sensor holding device composed of the alignment bearing 10, the rod-shaped body 13, etc. can be shortened, and the oil pressure 1 The entire lower cylinder can be made thinner. Also,
Since the magnetic scale rod 4 is supported by a single rod-shaped body 13 with a small exclusive area instead of the conventional circular tube with a large exclusive area, the effective area in the oil chamber 8 is expanded, so that the hydraulic pressure is reduced. This has the effect of making it possible to reduce the diameter of the reduction cylinder.

FIG. 3 is an explanatory diagram showing another embodiment of the present invention. In this embodiment, contrary to the previous embodiment, an alignment bearing 10 is installed inside the fixed body 2 of the cylinder on the center line using a spring 11 and a presser 12. 13 is installed. A member to which the magnetic head 6 is attached is coupled to the other end of the rod-shaped body 13, and a magnetic scale 4 is disposed passing through the inside of the magnetic head 6. This magnetic squeezing rod 4 is fixed within a movable body 1 connected to a metal chock 9.

In this embodiment, the essential structure is the same as that of the previous embodiment except that the magnetic head 6 is supported by the alignment bearing, so that it has the same effect.

As described above, according to the hydraulic reduction cylinder for a rolling mill of the present invention, it is possible to provide a hydraulic reduction cylinder for a rolling mill that reduces the effective area of the reduction hydraulic pressure.

FIG. 1 is an explanatory diagram showing a conventional hydraulic reduction cylinder equipped with a device for detecting the vertical position of a cylinder movable body, and FIG. 2 is an explanatory diagram showing a cross section of an embodiment of a hydraulic reduction cylinder for a rolling mill according to the present invention. FIG. 3 is an explanatory diagram showing a cross section of another embodiment of the present invention.

Claims (1)

[Claims] 1. In a hydraulic reduction cylinder for a rolling mill that has a built-in sensor for detecting the vertical position of the movable body of the cylinder, a tiltable bearing is provided inside the movable body of the cylinder, and one end is supported by this bearing. A rod-shaped body with the sensor movable part attached at the butt end is installed through an oil chamber and through the fixed body in the direction of the fixed body of the cylinder that makes sliding contact with the movable body, and the sensor fixed part is attached to the sensor movable part. A hydraulic reduction cylinder for a rolling mill, characterized in that it is provided outside a fixed body in close proximity to a part. 2 A tiltable bearing is provided inside the fixed body of the cylinder, and a rod-shaped body, one end of which is supported by this bearing and a sensor fixing part is attached to the other end, is inserted into the oil chamber in the direction of the movable body of the cylinder that makes sliding contact with the fixed body. The rolling mill according to claim 1, characterized in that the sensor movable part is provided through the movable body and substantially penetrates the movable body, and the sensor movable part that moves up and down in the vicinity of the sensor fixing part is installed inside the movable body. Hydraulic reduction cylinder.