JPS61176417A - Roll for transferring - Google Patents

Abstract

PURPOSE:To obtain a roll for transferring, free from bending deformation due to thermal expansion and flaws, by splitting a sleeve, inserted to a roll axis, along its longitudinal direction into plural isolated pieces, and holding these circular arcuate pieces, independently in the longitudinal direction and in a state capable of freely extending and contracting, by the end plates fixed to both ends of roll axis. CONSTITUTION:Plural circular-arcuate pieces 10 are formed by splitting a sleeve inserted to a roll axis 8 along the longitudinal direction. Each piece 10 is held independently in the longitudinal direction and in a state capable of freely extending and contracting by discoidal end plates 9, 11 fixed respectively to both ends of the axis 8. That is, the ends of each piece 10 are inserted in the end plates 9, 11 in a state incapable of moving in the longitudinal direction but a clearance is interposed in the longitudinal direction. Moreover, a spring 12 is provided to the clearance between the plate 11 and the piece 10 so that the spring 12 is in press contact with them in the longitudinal direction. By said constitution, a noiseless transferring roll with said excellent points, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a roller used for transporting rolled material during hot rolling.

<Prior art> In hot rolling, as shown in FIG. 5, a hot rolled material 3 at high temperature is carried on a large number of transfer rollers 4,
After being pinched and rolled by the work rolls 1 and backup rolls 2, it is further carried on the transfer rollers 4. The transfer roller 4 is rotatably supported, and when the hot rolled material 3 is loaded and transferred smoothly,
There is no problem as long as the hot rolled material 3 is heated uniformly, but when the transfer of the hot rolled material 3 is often stopped due to problems with the rolling mill or waiting for rolling time, the hot rolled material 3 may come into contact with the hot rolled material 4. Only that part is heated and thermally expands. If the temperature distribution becomes uneven in this way, the integrated transfer roller 5 shown in FIG. 6 will be deformed and, in severe cases, will be damaged. Even if it is not damaged, if it is deformed and bent, the rotation will be distorted and the hot rolled material 3 will not be transferred smoothly.

Therefore, as a way to solve this problem, the method shown in Fig. 7,
As shown in FIG. 8, a split-type transfer roller has been proposed. As shown in both figures, this split-type roller is constructed by horizontally splitting a sleeve fitted onto an a-ra shaft 8 into a plurality of split sleeves 7', 6' in a wavy or inclined shape, and each split sleeve 7'. A slight gap is provided in the longitudinal direction between ' and 6', and only the divided sleeves 6 and 7 at both ends are fixed to the roller shaft 8. In such a split roller, there is a slight gap between the split sleeves 6' and 7', so even if thermal expansion occurs due to uneven temperature distribution, the gap absorbs the thermal expansion. It will not deform, cause the song to crack, and will not be damaged.

<Problems to be Solved by the Invention> Although the split type roller described above has the advantage of not bending or causing damage even if the temperature distribution is uneven, the split sleeve other than the split sleeve 6°7 at the end of the roll shaft 6',
Since 7' is not restrained in any way against movement in the axial direction, when external force is applied, it moves freely in the longitudinal direction and collides, producing noise. Since several hundred transfer rollers are arranged in a set of hot rolling lines, the noise caused by the collision of the split rollers is extremely severe and worsens the working environment. SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and to provide a transfer roller that is free from bending deformation or damage due to thermal expansion and does not generate noise.

Means for Solving the Problems> The configuration of the transfer roller of the present invention that achieves the above object is such that the sleeve fitted onto the roller shaft is vertically split along the longitudinal direction to form a plurality of arcuate pieces. In addition, each of the arcuate pieces is independently extendable and contractible in the longitudinal direction and held by end plates fixed to both sides of the roller shaft.

Effect> When one or more of the plurality of circular arc pieces is heated and thermally expands, the amount of expansion in directions other than the longitudinal direction is negligibly small, as will be described later.
Each arc piece thermally expands in the longitudinal direction to an extent that cannot be ignored, but since each arc piece is held independently in the longitudinal direction so that it can expand and contract, even if the lengths of each arc piece are not the same, ,
As a transfer roller, it will not be damaged by bending.

<Example> Examples of the present invention will be described in detail below.

An embodiment of the present invention is shown in FIGS. 1 to 3.

As shown in the figure, the sleeve fitted onto the roller shaft 8 is longitudinally divided into a plurality of arcuate pieces 10], and each arcuate piece 10 has a specific shape as shown in Fig. 2. It has an arc shape with a radius. Disk-shaped end plates 9 and 11 are fixed on both sides of the roller shaft 8, and each of the arcuate pieces 10 is held on the end plates 9 and 11 so as to be able to expand and contract independently in the longitudinal direction. . That is, as shown in FIG. 3, the end of one arcuate piece 10 is fitted into the end plate 9, 11 without being able to move in the radial direction, and is also fitted with a gap in the longitudinal direction. A spring 12 is press-fitted in the longitudinal direction in the gap between the plate 11 and the arcuate piece lO. Therefore, since the arcuate piece 10 is always held down in one longitudinal direction by the spring 12, the arcuate piece 10 does not move freely and collide with each other, and the thermal expansion of the arcuate piece 10 prevents the arcuate piece 10 from colliding. Expansion and contraction in the direction is allowed. For example, when the arcuate piece 10 expands due to thermal expansion, the spring 12 contracts, and when the arcuate piece 10 cools and contracts, the spring 12 expands. Note that since there is a slight gap between the arcuate pieces 10, there is no problem with each arcuate piece 10 expanding and contracting independently. Further, the arcuate piece 10 may be slid in the longitudinal direction using a fixed guide such as the sleeve 13, for example. If this keyway is made into a T-shape, the backlash of the arcuate piece 10 can be eliminated.

In the transfer roller of this embodiment having the above configuration,
The amount of thermal expansion of the arcuate piece 10 in directions other than the longitudinal direction is so small as to be almost negligible. For example, the square object 2 shown in Figure 4
If 0 is heated uniformly, the 3 that make up this object 20
All edges produce the same distortion. In other words, Eaε2=εe.

From this, regarding the amount of thermal expansion, the X direction is Xxgx.

The Y direction is Yxεa, and the two directions are zxε2, which are proportional to the length of the side. From this, the arc piece 10 (made of steel) of this example
The amount of thermal expansion of VC in the thickness direction, width direction, and longitudinal direction was estimated.

Amount of thermal expansion in thickness direction: 500X11.7X10-'X30=;0.175m Amount of thermal expansion in width direction: 500X11.7X10-'X100=
Amount of thermal expansion in the longitudinal direction of 0.58mm: 500 x 11.7 x 10-' x3000=1
7.5■ However, the dimensions of the arc piece 10 are 30 m thick, 3000 m long, and 100 m wide. The coefficient of expansion of steel is 11.7 x 10-'/C. 50 temperature difference
The temperature was 0°C.

In this way, the other amounts of thermal expansion are sufficiently small compared to the amount of thermal expansion in the longitudinal direction, and the gap between the arcuate pieces 10 may be small. Further, the gap in the longitudinal direction between the arcuate piece 10 and the end plate 9.11 may be about 10 to 20 mm.

<Effects of the Invention> As described above in detail based on the examples, the transfer roller of the present invention has the following effects when the outer peripheral surface is locally heated:
Since one or more of the plurality of arcuate pieces constituting the outer circumferential surface can be expanded and contracted independently, the transfer roller will not bend or be damaged. Moreover, the thermal expansion of the arcuate piece in the width direction and thickness direction is very small and does not impede rotation in any way. Further, since the arcuate pieces are telescopically held by the end plates at both ends, there is no vibration due to rotation, and there is no possibility of them colliding with each other and producing noise.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a transfer roller according to an embodiment of the present invention, FIG. 2 is a perspective view of an arcuate piece, FIG. 3 is a cross-sectional view showing the state of connection between an arcuate piece and an end plate, and FIG. 4 is a perspective view of a square object,
FIG. 5 is an explanatory diagram showing the arrangement of transfer rollers in hot rolling, FIG. 6 is a perspective view of an integrated transfer roller, and FIG. 7 is a perspective view of an integrated transfer roller. FIG. 8 is a perspective view of each of the divided transfer rollers. In the drawings, 8 is a roller shaft, 9 and 11 are end plates, 10 is an arcuate piece, 12 is a spring, and 13 is a sleeve. Figure 2 Figure 3 Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] A sleeve fitted onto the roller shaft is longitudinally divided into a plurality of arcuate pieces, and each of the arcuate pieces extends and contracts independently in the longitudinal direction on end plates fixed to both sides of the roller shaft. A transfer roller characterized by being freely held.