JPH06104245B2 - Roll shift device for rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application> The present invention relates to a roll shift device for axially shifting lower rolls on a rolling mill in mutually opposite directions.

<Prior Art> In recent years, in order to improve the thickness accuracy of the rolled product in the plate width direction and to prevent step wear that occurs corresponding to the plate width on the surface of the work roll that is in direct contact with the rolled material, for example, 4 to 6 In a multi-stage rolling mill such as a multi-stage rolling mill, a roll shift device that moves upper and lower work rolls or upper and lower work rolls and upper and lower intermediate rolls in mutually opposite directions in the roll axial direction according to the change in strip width of the rolled material. Is being developed.

Although various types of such roll shift devices have been proposed, FIG. 2 shows a roll shift device using a hydraulic cylinder as a shift drive device. As shown in the figure, this example is a roll shift device for an upper work roll such as a four-high rolling mill. That is, both ends of the upper work roll 3 are supported by the housing via the work roll chocks 4a and 4b and are movable in the roll axial direction. A pair of support frames 11a, 11b are provided in a projecting manner on the housing 1 on either the drive side D or the working side W of the rolling mill (the drive side in the example).
The shift beam 2 is supported by 1b so as to be movable in the roll axis direction, and the piston rods 6 of the pair of roll shift cylinders 5 mounted on the shift beam 2 are mounted on the housing 1.
To the pin 7 via a pin 7. A pair of claws 8 are rotatably supported by a vertical pin 9 in the center of the shift beam 2, and the claws 8 are detachably engageable with the vertical grooves 10 of the work roll chock 4a. . The claws 8 are
For example, by a driving mechanism (not shown) such as a cylinder, it can be rotated around the pin 9 and locked in the vertical groove 10 of the roll chock 4a. Further, also for the lower work roll, a roll shift device similar to the above is configured.

On the other hand, when shifting the upper and lower work rolls in response to changes in the strip width of the rolled material, it is necessary to accurately measure the axial position of each roll. The vessel 13 is mounted on the support frame 11a on either the input side or the output side (the input side in the case shown) of the rolling direction Z. That is, as shown in FIG. 3, the position detector 13 for the upper work roll is a pulse oscillator (PLG) such as a pinion 15, a bearing 16, a miter gear 17, a speed reducer 18, and celsin which mesh with the rack 14 mounted on the shift beam 2. 19 and their connecting shafts 20a, 20b, 20c. still,
Although not shown in the drawings, the lower work roll position detector is mounted on the support frame on the opposite side of the upper work roll position detector 13 (outward side in the rolling direction).

In the roll shift device described above, when the roll shift cylinder 5 is expanded and contracted to move the upper work roll 3 to the driving side D (the lower work roll is moved to the working side W) via the roll chock 4a, the rack 14 meshes with the rack 14. Pinion 15
Is rotated, and the rotation is transmitted through the speed reducer 18 to the pulse oscillator.
It is transmitted to 19 and the amount of movement is detected.

<Problems to be Solved by the Invention> However, in the conventional roll shift device, the roll shift position is detected by the pulse oscillator 19 via the rack 14, the pinion 15, the miter gear 17, the speed reducer 18, and the like. , In addition to the initial clearance such as gear backlash, the so-called mechanical rattling occurs due to the wear of the sliding contact member during long-term operation, the position detection accuracy decreases, and it often requires maintenance of the device and detection. There is a drawback that the equipment cost and maintenance cost are high because the structure of the vessel itself is complicated.

The present invention has been made in view of the above problems, the structure is extremely compact, the equipment cost is low, and it is possible to always maintain high-precision position detection without being affected by mechanical backlash as in conventional devices. An object of the present invention is to provide a shift device.

<Means for Solving Problems> The structure of the present invention which achieves such an object is a roll shift of a rolling mill in which an upper roll and a lower roll are respectively moved in a roll axial direction by a roll shift cylinder in accordance with a change in strip width of a rolled material. In the apparatus, the piston rod of the roll shift cylinder is made of a magnetic material, and a ring-shaped non-magnetic material is axially mounted on the outer circumference of the piston rod, while an electromagnetic detecting a relative position displacement of the piston rod by a change in magnetic resistance. The coil is housed inside the cylinder cover of the roll shift cylinder.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The figure is A in FIG.
FIG. 4 is a cross-sectional view of a main part of a portion corresponding to a portion, in which the same or similar members as those of the conventional device (see FIG. 2) are denoted by the same reference numerals. That is, the piston 25 is slidably inserted into the roll shift cylinder 5, and the piston rod 6 is fixed to the piston 25.
The cylinder cover 21 fitted to one end of the is penetrated through a seal ring 27. The piston rod 6 is made of a magnetic material, and a plurality of ring-shaped non-magnetic materials 24 are mounted on the outer peripheral surface along the axial direction over substantially the entire length thereof at equal pitches, while the inner peripheral portion of the cylinder cover 21. A non-contact type position detector 22 is configured by mounting a position detection head 23 composed of a ring-shaped electromagnetic coil on the. That is, the position detection head 23 is installed with a slight gap provided on the outer circumference of the piston rod 6. Further, in the figure, 26 is a lead wire connected to the position detection head 23. The position detector 22 is attached to each of the pair of upper and lower roll shift cylinders 5, or to one of the upper and lower pairs.

With the above configuration, when the coil of the detection head 23 is excited and the roll shift cylinder 5 is operated, the magnetic resistance repeats a change every pitch as the piston rod 6 moves. The shift position of the roll 3 is accurately determined by detecting the coil induced voltage change due to the magnetic resistance through a converter (not shown) and measuring the relative displacement between the piston rod 6 and the cylinder 5, that is, the roll chock 4a. Can be measured.

<Effects of the Invention> As described above in detail based on the embodiments, since the electromagnetic non-contact type roll shift position detector is built in the roll shift cylinder, the structure of the detector is extremely compact and installed. The cost can be remarkably reduced compared to the conventional device, the detection accuracy does not deteriorate due to mechanical backlash as in the conventional device, and the maintenance cost can be reduced by maintenance-free. There is.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a roll shift cylinder according to an embodiment of the present invention, FIG. 2 is a schematic plan view of a conventional roll shift device, and FIG. 3 is a perspective view of a roll shift position detector. is there. In the drawings, 3 is a work roll, 5 is a roll shift cylinder, 6 is a piston rod, 21 is a cylinder cover, 22 is a roll shift position detector, 23 is a detection head, and 24 is a non-magnetic material.

Front page continued (72) Inventor Akiichi Naito 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Hiroyuki Nakajima 6-4 Minami-kannon, Nishi-ku, Hiroshima-shi, Hiroshima No. 31 Ryosen Engineering Co., Ltd.

Claims (1)

[Claims] 1. A roll shift device for a rolling mill in which an upper roll and a lower roll are respectively moved in a roll axial direction by a roll shift cylinder in accordance with a change in strip width of a rolled material, and a piston rod of the roll shift cylinder is made of a magnetic material. A ring-shaped non-magnetic material is axially mounted on the outer circumference of the piston rod, and an electromagnetic coil for detecting relative position displacement of the piston rod by magnetic resistance change is housed in the inner circumference of the cylinder cover of the roll shift cylinder. A roll shift device for a rolling mill.