JP2013124857A - Roller hearth kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller hearth kiln which does not require a set bolt for fixing a connecting pin, and can reduce man-hours of assembling work for connecting a driving shaft at a driving device side and a driven shaft at a roller side.SOLUTION: In a sleeve 16 that connects a driving shaft 7 of a driving device of the roller hearth kiln and a driven shaft 13 at a roller 3 side, connecting pins 17, 18 penetrating the shafts 7, 13 in a diameter direction are punched. A cylindrical cap 19 for preventing the connecting pins 17, 18 from dropping is fitted to an outer periphery of the sleeve 16 and fixed by a C ring 20.

Description

  The present invention relates to a roller hearth kiln used for drying and baking various workpieces. There are various types of workpieces processed by Roller Hearth Kiln, including molded products, intermediate products, and powder raw materials.

  A roller hearth kiln is a structure that heats a workpiece placed on a roller by arranging a number of ceramic rollers at a constant pitch inside a tunnel-shaped furnace body and rotating each roller at a constant speed. It is a furnace. Each roller is driven by a driving device provided on one side in the width direction of the furnace body, and the opposite side of each roller is generally rotatably supported by a small support roller.

  As shown in Patent Document 1, the drive shaft extending from the drive device side and the driven shaft extending from the roller side are connected by a sleeve made of a heat-resistant metal such as stainless steel, and the sleeve passes through these shafts. Pins are provided. These connecting pins are fixed by set bolts so as not to fall off. However, if the position of the counterbore hole for the set bolt formed in the sleeve and the through hole of the connecting pin are slightly shifted, the set bolt may be loosened or dropped during transportation or operation.

  Also, in order to connect the drive shaft on the drive device side and the driven shaft on the roller side, it is necessary to drive connection pins and set bolts for each roller, but the number of rollers reaches several hundred. Due to the large number, there is a problem that a very large number of assembly steps are required.

JP 2000-146449 A

  Accordingly, the object of the present invention is to solve the above-mentioned conventional problems, eliminate the need for set bolts for fixing the connecting pins, and reduce the number of assembly operations for connecting the drive shaft on the driving device side and the driven shaft on the roller side. Is to provide a roller hearth kiln that can be.

  The roller hearth kiln of the present invention made to solve the above problems is a roller hearth in which a large number of rollers are arranged at a constant pitch inside a furnace body and each roller is rotated by a driving device provided on one side of the furnace body. In the kiln, a connecting pin that diametrically penetrates these shafts is driven into a sleeve that connects the driving shaft of the driving device and the driven shaft on the roller side, and the connecting pin is prevented from falling off on the outer periphery of the sleeve. A cylindrical cap is attached.

  In addition, as described in claim 2, it is preferable that the end face in the axial direction of the roller of the cylindrical cap is fixed by a C-ring engaged with the sleeve.

  Since the roller hearth kiln of the present invention has a structure in which both ends of the connecting pin are restrained by a cylindrical cap attached to the outer periphery of the sleeve to prevent the falling off, a conventional set bolt for fixing the connecting pin is unnecessary. Become. For this reason, high accuracy is not required for the machining of the through hole of the connecting pin, the manufacturing cost can be reduced, and the number of man-hours for connecting the driving shaft on the driving device side and the driven shaft on the roller side can be reduced There is an advantage that can be.

  Moreover, if it is set as the structure which fixed the end surface of the axial direction of the roller of the cylindrical cap by C ring like Claim 2, an assembly process can be performed still more easily.

It is sectional drawing of the roller hearth kiln of embodiment of this invention. It is a fragmentary sectional view of the part which connects the drive shaft by the side of a drive device, and the driven shaft by the side of a roller. It is an expanded sectional view of the principal part. It is AA sectional drawing of FIG.

Embodiments of the present invention will be described below.
FIG. 1 is a sectional view in the furnace width direction of a roller hearth kiln according to an embodiment of the present invention. In FIG. 1, 1 is a tunnel-shaped furnace body, 2 is a side wall, 3 is a roller arranged through the left and right side walls.

  A large number of rollers 3 are arranged at a predetermined pitch in the longitudinal direction of the furnace body 1. The roller 3 is a ceramic roller excellent in heat resistance and high temperature strength, and is preferably made of SiC ceramic. Both ends of the roller 3 extend from the roller through hole 4 formed in the furnace wall 2 to the outside of the furnace. One end of the roller 3 is rotatably supported by a small support roller 5 and the other end is a drive device 6. Driven and rotated. In this embodiment, seal boxes 11 are provided at both ends of the roller 3 to prevent outside air from entering the furnace body 1. The workpiece W is placed on the roller 3 and is heated by a heating device such as a heater (not shown) while being conveyed through the furnace body 1 at a constant speed as the roller 3 rotates.

  The drive device 6 may be a chain drive type that drives a large number of rollers 3 by a chain, as in the prior art, but in this embodiment, a screw gear 8 is provided at the end of each drive shaft 7 and is driven by a motor 9. A gear drive type is employed in which the drive gear 10 is engaged with each screw gear 8 to rotate the drive shaft 7. The drive gear 10 is attached to a long shaft 12 extending in the longitudinal direction of the furnace body 1.

  As shown in FIG. 2, the drive shaft 7 is connected to a driven shaft 13 extending from the roller 3 side inside the seal box 11. The driven shaft 13 on the roller 3 side is connected to a cap fitting 14 that holds the end of the roller 3 with a pin 15 as in the prior art.

  As shown in enlarged views in FIGS. 3 and 4, the drive shaft 7 extending from the drive device 6 and the driven shaft 13 on the roller 3 side are connected via a sleeve 16 made of a heat-resistant metal such as stainless steel. Specifically, a first connecting pin 17 is driven near one end of the sleeve 16 so as to penetrate the drive shaft 7 in the diametrical direction. A second connecting pin 18 is driven in the vicinity of the other end of the sleeve 17 so as to penetrate the driven shaft 13 in the diameter direction. The first connecting pin 17 and the second connecting pin 18 are perpendicular to each other and form a so-called universal joint.

  As described above, a set bolt has been conventionally used to prevent the connection pins 17 and 18 from falling off, but in the present invention, a cylindrical cap 19 is attached to the outer periphery of the sleeve 16. The cylindrical cap 19 is a thin cylinder made of a heat-resistant metal such as stainless steel, and is fitted on the outer periphery of the sleeve 16 as shown in FIGS. 3 and 4 to prevent the connecting pins 17 and 18 from falling off.

  The cylindrical cap 19 needs to be fixed to the outer periphery of the sleeve 16 by appropriate means. The fixing method for this is not particularly limited, but in this embodiment, both end surfaces of the roller of the cylindrical cap 19 in the axial direction are fixed by the C ring 20. The C-ring 20 can be easily attached to the sleeve 16, thereby reliably preventing the cylindrical cap 19 from moving in the axial direction of the roller.

  As described above, the roller hearth kiln of the present invention has a structure in which the cylindrical cap 19 is attached to the outer periphery of the sleeve 16 to restrain both ends of the connecting pins 17 and 18 and prevent them from falling off. No set bolt is required. For this reason, high accuracy is not required for processing the through holes of the connecting pins 17 and 18, and the manufacturing cost can be reduced. Further, by eliminating the set bolt, the number of work steps for connecting the drive shaft 7 on the drive device 6 side and the driven shaft 13 on the roller 3 side can be greatly reduced.

DESCRIPTION OF SYMBOLS 1 Furnace 2 Side wall 3 Roller 4 Roller through-hole 5 Support roller 6 Drive device 7 Drive shaft 8 Screw gear 9 Motor 10 Drive gear 11 Seal box 12 Shaft 13 Drive shaft 14 Cap metal fitting 15 Pin 16 Sleeve 17 First connection pin 18 Second connecting pin 19 Cylindrical cap 20 C ring

Claims (2)

A plurality of rollers arranged at a constant pitch inside the furnace body;
In the roller hearth kiln provided with one side of the furnace body and a driving device for rotating the roller,
A sleeve connecting the drive shaft of the drive device and the driven shaft on the roller side;
A first connecting pin penetrating from one end of the sleeve in the diameter direction of the drive shaft;
A second connecting pin penetrating from the other end of the sleeve in the diameter direction of the drive shaft;
A cylindrical cap provided on the outer periphery of the sleeve to prevent the connecting pin from dropping off;
A roller hearth kiln characterized by having C-rings engaged with the sleeve are provided at both axial ends of the cylindrical cap,
The roller hearth kiln according to claim 1, wherein the cylindrical cap is fixed to the sleeve by the C ring.