JPH06328321A - Field tooth flank working method for kiln driving ring type gear - Google Patents

Abstract

PURPOSE:To quickly and correctly repair the tooth flank of a ring type gear damaged with use by fixing part of the circumference of the ring type gear to a cutting device to give cutting work to a few gears. CONSTITUTION:A cutting device 7 is conformed to the whole distortion of a girth gear 4 and corrects local distortion, and is made to be movable in X, Y, and Z directions and rotatable in a plain orthogonal to a tooth surface for performing working while conforming to the present condition of the girth gear 4 as a whole. Part of the circumference of the gear 4 is fixed to this cutting device 7 to cutting-work a few tooth surfaces by the cutting blade 10 of the cutting device 7. Moreover many tooth surfaces are cutting-worked by moving the fixed portion of the girth gear 4 to the cutting device 7 via a gear cover 9 by the rotation of a pinion 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-site tooth surface machining method for a rotary kiln drive ring gear used in a cement plant or a sintering plant.

[0002]

2. Description of the Related Art A large-diameter long steel cylinder is supported at a plurality of positions by rolls, and when the cylinder is driven to rotate by a ring gear mounted on the outer periphery of the cylinder, the ring-shape is used. Even if the tooth flanks of the gears are worn or fatigue-damaged by long-term use, their replacement is inexpensive and cannot be achieved in a short time. The manufacturing cost of a large-diameter gear is high, the cost of replacement is also high, and the period requires one to several weeks.

Since a ring gear is generally rotated in one direction, only one tooth surface is damaged, and the vicinity of the tooth root is not damaged. However, when removing once and performing overlaying repair, full overlay welding including the tooth bottom, heat treatment and machining are required, and it takes a period of 1 to several months and a large amount of cost. It is used only as. Therefore, the present condition is that the correction of the damage to the tooth surface is performed on a very small scale using a hand grinder.

[0004] The applicant of the present invention, 30 years ago, made a lot of skilled workers in the field to build up the tooth surface and finish with a hand grinder. According to the on-site processing, the build-up part is limited to the damaged tooth surface only, and the welding amount is only a fraction of that when removed, and the welding cost is also less, but many hand grinder finishes are required on site. It is difficult to adopt the construction method performed by a skilled person at present. Since a short-term construction is required and shift work is sometimes performed, it is currently difficult to secure such a large number of skilled workers, and there remains a problem in maintaining accuracy.

[0005]

[Problems to be Solved by the Invention]
It is conceivable to modify the gears for cutting or local machining for finishing after overlay welding, but steel cylinders and ring gears are used to absorb the thermal expansion of the kiln, especially in kilns for firing. It is connected by a connecting rod and is not fixed to the kiln. Therefore, it is difficult to maintain accuracy and a vibration may occur during processing by a method in which a cutting device is installed on a substrate and a ring gear is used as a fixed object, like a normal large-scale local machine. Of course, the ring gear is mounted on the kiln, and it is difficult to mount the ring gear on the processing device as a whole.

An object of the present invention is to provide a method for repairing a damaged ring gear on-site in a quick and accurate manner.

[0007]

According to the present invention, when the tooth surface of a rotary drive ring gear mounted on the outer circumference of a steel cylinder is machined locally, a part of the circumference of the ring gear is cut. It is a local tooth surface machining method for a kiln drive circular ring gear that is fixed to a cutting device, cuts a small number of tooth surfaces, and cuts a large number of tooth surfaces by moving the fixed part of the gear to the cutting device. By repeating the above cutting process, it is possible to perform the cutting process for all the teeth. The method of the present invention is applicable to both cutting correction and finish cutting after overlaying.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is an explanatory view of a rotary kiln device, in which 1 is front equipment, 2 is rear equipment, 3 is rotary kiln, 4 is a girth gear of a ring gear, and 5 is a supporting tire.

FIG. 2 is an explanatory view of one embodiment of the present invention. The girth gear 4 is connected to the rotary kiln 3 by a connecting rod 6, and the cutting device 7 is fixed to a part thereof. In FIG. 2, 8 is a pinion and 9 is a gear cover. The cutting device 7 has a cutting blade 10 as shown in FIGS.
Is the horizontal direction (X direction), the front-back direction (Y direction, vertical direction) (Z
Direction) and the gears to rotate. Further, the cutting device 7 is not limited to the one shown in the drawing, and an arc can be used in the X direction, and various types of cutting blades 10 used for ordinary machining are used. FIG. 4 is an explanatory view showing an example of fixing the girth gear 4 and the cutting device 7.

The ring gear is often distorted due to long-term use. Even if it is distorted at rest, it is held at a proper position relative to the pinion because it is pulled by the connecting rod when driving, so it should be adjusted to the non-damaged part of the target tooth during cutting. It is usual to process by cutting, but if there is a special distortion, it may be corrected and cut.

In this way, the cutting device can be moved in the X, Y, and Z directions as shown in the figure in order to adjust to the overall strain, correct the local strain, and process according to the current state of the gear as a whole. It is desirable to rotate in a plane perpendicular to the tooth surface, and numerical control is also free.

[0012]

As described above, according to the present invention, a part of the circumference of the ring gear is fixed to the cutting device for repair, so that the repair can be performed accurately and quickly. By adopting a method in which several teeth can be cut by fixing to the cutting device once, it is possible to measure the strain before and after fixing, and local correction can be applied to multiple teeth, improving efficiency. And the improvement of accuracy can be desired together.

[Brief description of drawings]

FIG. 1 is an explanatory view of a rotary kiln device.

FIG. 2 is an explanatory diagram of one embodiment of the method of the present invention.

FIG. 3 is a view taken along the line AA in FIG.

FIG. 4 is a view taken along the line BB in FIG.

[Explanation of symbols] 3 rotary kiln 4 girth gear 6 connecting rod 7 cutting device

Claims (1)

[Claims] 1. When a tooth surface of a rotary drive ring gear mounted on the outer circumference of a steel cylinder is locally machined, a part of the circumference of the ring gear is fixed to a cutting device, and a small number of gears are provided. A local tooth flank machining method for kiln drive ring gears, characterized in that a large number of gears are cut by moving the fixed parts of the gears to the cutting device.