JPH08295948A - Hearth roll with sleeve - Google Patents

Abstract

PURPOSE: To prevent the cracking of a sleeve and to ensure the transfer of torque by forming the end surface of the sleeve fitted onto the shaft body of a hearth roll and the end surface of a stopper pushed against the sleeve to shapes inclined to the shaft core. CONSTITUTION: A metallic strip is carried with the hearth rolls with the sleeve arranged in a heat treatment furnace and the heat treatment is executed without developing a pickup on the metallic strip. In the hearth roll with this sleeve, the sleeve 1 is fitted onto the shaft body 5 and both ends are held with stoppers 3a, 3b. These stoppers 3a, 3b are engaged with end sleeves 4a, 4b fixed to the shaft body 5 with pins 6a, 6b and the one side of stopper 3b is pushed to the sleeve 1 in the shaft direction with a spring 2 to transmit the rotating force. At this time, the end surface of the sleeve 1 and the end surface of the stopper 3 pushed against the sleeve are formed as the shape cut off with the flat surface having the inclining angle to the shaft core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hearth roll with a sleeve which is installed in a heat treatment furnace for metal strips and conveys the metal strips.

[0002]

2. Description of the Related Art A hearth roll for carrying metal strips is installed in a heat treatment furnace for metal strips. However, in a high temperature furnace, metal strip surface portions, scales, and the like adhere to the roll surface. The pick-up phenomenon is likely to occur in which the unevenness is transferred to the metal strip and the quality is deteriorated. In high-quality operations that dislike this, it is common to make the surface of the hearth roll carbon or ceramic, and a structure in which a sleeve of carbon or ceramic is fitted to the shaft body of heat resistant steel is often adopted. .

In order to match the rotations of the fitted sleeve and the shaft body, Japanese Patent Publication No. 3-249122 and Japanese Patent Publication No.
As described in Japanese Patent Laid-Open No. 1-312026, grooves are provided at both end portions of a sleeve, and a key or a cotter is attached to the shaft body through the grooves. Further, in the case of a ceramic sleeve, a structure in which one end of the sleeve is elastically pressed by a pressing member having a shaft as a seat is also known as described in Japanese Patent Publication No. 62-280324.

[0004]

By the way, when torque is transmitted by the key or the cotter as described above, since the coefficient of thermal expansion of ceramic or carbon and the steel material of the shaft body are considerably different, the key and the key groove are loose. I have no choice but to fit it. Therefore, an impact force is often generated during the operation, and an accident that ceramics or carbon is cracked often occurs.

On the other hand, when torque is transmitted by a pressing material, a considerably large pressing force is required to prevent slippage, and there is a concern that the sleeve may be broken due to this, which makes practical application difficult. .

[0006]

The present invention provides a roll structure in which the ceramic or carbon sleeve and the stopper are surely in contact with each other over the entire surface regardless of the difference in thermal expansion, and the pressing force is not so large. A hearth roll with a sleeve that prevents pickup and prevents the sleeve from being damaged by impact or pressing force.

That is, according to the present invention, a metal sleeve is installed in a heat treatment furnace for metal strips, and a sleeve fitted to a shaft is transmitted from the end of the shaft through a stopper axially pressed by a spring to transmit a rotational force to the metal. A hearth roll with a sleeve for transporting a strip, wherein an end surface of the sleeve and an end surface of a stopper pressed against the sleeve are cut by a plane having an inclination angle with respect to an axis. It is a roll.

[0008]

[Operation] According to the present invention, the end surface of the sleeve and the end surface of the stopper are formed by cutting at a plane having an inclination angle with respect to the axis, so that both are pressed as long as the pressing force acts. Since they are in contact with each other all the time, no impact force is generated even when the threading starts or when the rotation speed changes, so there is no breakage of the sleeve.

Further, since the contact surfaces of the both are inclined with respect to the shaft center, the torque is transmitted by the total of the component force of the pressing force and the frictional force, so that the pressing force is reduced and the sleeve by the pressing force is reduced. There is no damage.

[0010]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a hearth roll with a sleeve as seen from the front, 1 is a sleeve, 2 is a spring, 3 is a stopper, 4
Is an end sleeve, 5 is a shaft, 6 is a pin, 7 is a bearing, 8
Is a cup rig. There are parts with the same name on the left and right,
To distinguish these, the right one is marked with a and the left one is marked with b.

FIG. 2 is a plan view showing a part of the sleeve 2, and FIG. 3 is a front view of the same. The material is carbon or ceramics, and the end faces 11 at both ends have a convex shape cut by two symmetrical planes forming an inclination angle θ with respect to the axis, as shown in FIG. 4 is a cross-sectional view of the stoppers 3 arranged on both sides of the sleeve 1 as seen from the front, and FIG. 5 is a side view taken along the arrow AA. The end surface 31 on the side in contact with the sleeve 1 corresponds to the end surface of the sleeve 1 described above. Then, it has a concave shape cut along two symmetrical planes forming an inclination angle θ with respect to the axis.

Contrary to this embodiment, the sleeve 1
The side may be concave and the stopper 3 side may be convex.
In the inner diameter portion of the stopper 3, as shown in FIG. 5, groove portions 32 having a larger diameter are provided at positions 180 degrees symmetrical. Figure 6
FIG. 4 is a sectional view of the end sleeve 4. End sleeve 4
Is fitted on the shaft body 5 further outside the stopper 3. The inner end portion is extended 180 degrees symmetrically toward the stopper 3 to form a fork portion 41, and the fork portion 41 is inserted into the groove portion 32 provided in the inner diameter portion of the stopper 3 and the torque is increased. To convey. Further, since the end sleeve 4 and the shaft body 5 are fixed by the pin connection, the pin hole 42 is formed in the outer end portion.

Incidentally, an example of an assembling procedure of this hearth roll is shown in FIG. 1 as follows. 1) From the right side of the shaft body 5, the end sleeve 4a is fitted and the pin 6a is driven and fixed. 2) Fit the stopper 3a and the sleeve 1 on the right side from the left side of the shaft body 5. 3) Fit the stopper 3b and the spring 2 on the left side. 4) Fit the left end sleeve 4b. At this time, it is necessary to adjust the angle so that the fork portion 41 of the end sleeve 4b is inserted into the groove portion 32 of the stopper 3. The end sleeve 4b is pushed in using a jig or the like as appropriate, and the pin 6b is driven in and fixed while the spring 2 is being bent by a predetermined amount.

After this, the bearings 7a and 7b on both sides and the coupling 8 are properly attached. Since the hearth roll of the present invention is configured as described above, the shaft body 5 has a larger thermal expansion than the sleeve 1 made of ceramic or carbon at the time of use at high temperature, and the compressed spring 2 expands. Since the pressing force is reduced, it is necessary to compress a certain amount or more during assembly at room temperature.

FIG. 7 is a partial sectional view showing a modified embodiment. Instead of cutting the ends of the sleeve 1 and the stopper 3 in two planes, an angle of inclination with respect to the axis 1
Although the shape is cut along a plane, the same effect can be obtained.

[0016]

According to the present invention, since the sleeve of carbon or ceramic is used on the surface of the hearth roll and the sleeve is not damaged, the pickup is reduced and the quality of the metal strip is improved. Since it can transmit a large torque, it has the excellent effect of improving productivity.

[Brief description of drawings]

FIG. 1 is an assembled sectional view of a hearth roll showing an embodiment of the present invention.

FIG. 2 is a partial plan view showing a sleeve according to an embodiment of the present invention.

FIG. 3 is a partial front view showing a sleeve according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a stopper according to an embodiment of the present invention.

5 is a side view taken along the line AA of FIG.

FIG. 6 is a cross-sectional view showing an end sleeve according to an embodiment of the present invention.

FIG. 7 is a partial assembly sectional view of a hearth roll according to another embodiment of the present invention.

[Explanation of symbols]

 1 Sleeve 2 Spring 3 Stopper 4 End Sleeve 5 Shaft 6 Pin 7 Bearing 8 Coupling 11 End Face 31 End Face 32 Groove 41 Fork 42 Pin Hole

Claims (1)

[Claims] 1. A stopper (3) which is installed in a heat treatment furnace for metal strips and which axially presses a sleeve (1) fitted on a shaft (5) from the end of the shaft by a spring (2). A hearth roll with a sleeve for transmitting a rotational force via the sleeve to convey a metal strip, wherein an end surface (11) of the sleeve (1) and an end surface (31) of a stopper (3) pressed against the sleeve (1) serve as an axial center. A hearth roll with a sleeve, which is characterized by being cut along a plane having an inclination angle.