JPH1144487A - Driving part of roller hearth kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving part of a roller hearth kiln in which there is no fear that a roller is broken even when a forced braking force is given to the roller or the roller hardly has cracks due to rotary bending fatigue even when a furnace casing is deformed under thermal expansion. SOLUTION: The driving part of a roller hearth kiln rotatably supports the outer peripheries of both the end parts of the roller hearth kiln by rollers 3 provided on the outside of a furnace casing 2, so that even when the furnace casing 2 is deformed by thermal expansion, a bending stress is not applied to the roller 1. Further, both the end faces of the roller 1 are pressed by a spring 9 so that a rotation from a driving shaft 5 is transmitted by frictional force between the roller 1 and the spring 9. Thus, the breakage of the roller 1 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a driving portion of a roller hearth kiln.

[0002]

2. Description of the Related Art Roller hearth kilns in which a number of rollers are arranged by penetrating a furnace body in the width direction have been widely used as furnaces suitable for high-temperature firing of various products. In this roller hearth kiln, it is necessary to drive each roller. For example, as shown in JP-A-9-26264, a universal joint is used to prevent eccentricity between the center axis of the roller and the drive shaft. A drive unit for transmitting rotation to a roller has been used. However, even if an excessive stopping force is applied to the roller for some reason, the rotational force is mechanically transmitted from the drive shaft to the roller through the pin, so that the roller may be damaged. Was.

[0003] In addition, as shown in FIG. 3, there is also known a drive unit in which both ends of a roller 21 are connected to a drive shaft 23 via a spring 22, and the rotation is transmitted to the roller 21 by the frictional force of the spring 22. (Japanese Utility Model Publication No. 1-30766). In this drive unit, the tip of a drive shaft 23 extends to the inside of the roller 21, and the roller 21 is supported by the drive shaft 23 from the inside. However, this driving unit has a problem that when the furnace body 24 is deformed due to thermal expansion as shown in an exaggerated manner in FIG. 4, the cores at both ends of the roller 21 are displaced and cracks are easily caused by rotational bending fatigue. In addition, this structure also has a problem that the alignment of the roller 21 is difficult.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and there is no possibility that the roller will be damaged even if an excessive stopping force is applied to the roller. The purpose of the present invention is to provide a roller hearth kiln driving unit in which a roller is less likely to crack due to rotational bending fatigue even when deformed.

[0005]

The drive unit of the roller hearth kiln of the present invention, which has been made to solve the above problems, comprises:
The outer periphery of both ends of the roller is supported by rollers provided outside the furnace body, and both end surfaces of the roller are pushed by springs, and rotation from the drive shaft is transmitted to the rollers by frictional force between the rollers and the springs. It is characterized by having made it. In addition, it is preferable to adopt a structure in which a spring for preventing abrasion is wound around portions supported by rollers on the outer periphery of both ends of the roller.

According to the present invention, since the outer periphery of both ends of the roller is supported by the rollers provided outside the furnace body, even if the furnace body is deformed by thermal expansion, the rollers on the rollers are horizontal. The state can be maintained, and rotation bending fatigue is unlikely to occur. Further, according to the present invention, since both ends of the roller are pushed by the spring and the rotation from the drive shaft is transmitted to the roller by the frictional force between the roller and the spring, when an excessive stopping force is applied to the roller. , A slip occurs between the roller and the spring, and rotation transmission to the roller is stopped. For this reason, it is possible to prevent the roller from being damaged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a ceramic hollow roller, and reference numeral 2 denotes a roller hearth kiln. These rollers 1 have a furnace body 2 around the outer periphery of both ends.
Are horizontally and rotatably supported by a pair of rollers 3, 3 provided on the outside of the furnace 2, and are arranged at a constant pitch over the entire length of the furnace body 2.

[0008] Reference numerals 4 and 4 denote bearings provided outside the furnace body 4, which support a drive shaft 5 and a driven shaft 6, respectively. Reference numeral 7 denotes a flange portion provided on the drive shaft 5 and the driven shaft 6 so as to be adjustable in position. Reference numerals 8 and 8 denote sleeves inserted at both ends of the roller 1. And the flanges 7, 7
Springs 9, which are compression coil springs, are provided between the roller 1 and both end faces of the roller 1, and press the both end faces of the roller 1. The springs 9 are wound around the outer circumferences of the sleeves 8.

A sprocket 10 is provided on the drive shaft 5 and is rotated by an appropriate drive source. The rotation of the drive shaft 5 is transmitted to the roller 1 via a spring 9 which is in contact with the end surface of the roller 1, and the roller 1, which is rotatably supported by the rollers 3, frictionally acts with the spring 9. Rotate by force. For this reason, when an excessive stopping force is applied to the roller 1, a slip occurs between the spring 9 and the end face of the roller 1, and the roller 1 is not forcibly rotated. There is no danger.

Further, even if the furnace body 2 is deformed by thermal expansion as shown in FIG.
Since it is only supported by the rollers 3, 3 provided on the outside, there is no possibility of being bent forcibly. For this reason, the roller 1 on the rollers 3 and 3 can always maintain a horizontal state, and since rotation bending fatigue does not easily occur, a long service life can be obtained. The compression force of the spring 9 can be adjusted by sliding the position of the flange 7 in the axial direction.

As described above, since the roller 1 is supported by the rollers 3 and 3 in the present invention, the outer periphery of both ends of the roller 1 may be gradually worn due to long-term use. Therefore, as shown in FIG.
If a spring 11 for preventing wear is wound around the portion supported by 3, the wear can be prevented. The spring 11 can be closely attached to the surface of the roller 1 by its own elasticity, and can be easily attached and detached.

[0012]

As described above, according to the present invention, even when the furnace body is deformed due to thermal expansion, the rollers on the rollers can be maintained in a horizontal state, and rotational bending fatigue hardly occurs. . In addition, according to the present invention, since a compression force is applied to the roller by the spring, the growth of a crack due to rotational bending fatigue is prevented, and the life can be extended. Further, according to the present invention, when an excessive stopping force is applied to the roller, a slip occurs between the roller and the spring, and rotation transmission to the roller is stopped, so that the roller does not break. . Further, if a spring for preventing abrasion is wound around the outer periphery of both ends of the roller, the abrasion of the roller can be effectively prevented.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a conventional example.

FIG. 4 is an explanatory diagram showing a problem of a conventional example.

[Explanation of symbols]

1 roller, 2 furnace body, 3 rollers, 4 bearings, 5
Drive shaft, 6 driven shaft, 7 flange, 8 sleeve, 9 spring, 10 sprocket, 11 spring for wear prevention

Claims (2)

[Claims] An outer periphery of both ends of a roller is supported by rollers provided outside a furnace body, and both end surfaces of the roller are pushed by a spring, and rotation from a drive shaft is caused by frictional force between the roller and the spring. Roller hearth kiln drive unit characterized by transmitting to rollers. 2. The roller hearth kiln drive unit according to claim 1, wherein a spring for preventing abrasion is wound around portions supported by the rollers on the outer periphery of both ends of the roller.