JPH031759Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application: The present invention relates to a high-temperature rotary kiln that is constructed so that the thermal expansion and contraction of the kiln body as the furnace temperature rises and falls is not inhibited by the rotating tires. It is something.

Conventional technology: As is well known, rotary kilns are used for heating and drying granules, powders, etc.
Including Chemical Engineer's Handbook, etc.
Its structure and design methods are described in domestic and foreign specialized books.

A rotary kiln usually has a rotating cylindrical furnace body with a slight slope, two sets of tires fitted around it, two sets of rollers that support the tires, and a roller for rotating the furnace body. The girth gear includes a drive with a pinion that drives the girth gear.

The material to be treated is supplied to the furnace body from the high elevation side and is heated by contacting the heating hot gas in parallel or countercurrent, and the treated material is discharged from the low side. Ru.

In the above-described conventional rotary kiln, the kiln body expands due to a temperature rise due to heating.
On the other hand, tires are exposed to outside air and cooled down, so
Since the temperature rise is small and the expansion is small, problems such as buckling of the outer shell of the kiln main body and deviation of the center of the tire from the axis of the kiln main body generally occur at the joint between the tire and the kiln main body. As a countermeasure, for example, in the cross-sectional view of the rotary kiln shown in FIG. 4, the tire 2 is connected to the kiln main body 1 by a connecting fitting 3 so that heat transfer from the kiln main body 1 to the tire is small. ing. Further, for example, the connecting fitting 3 in FIG. 4 is a plurality of plate springs 3a having a chevron-shaped cross section as shown in FIG. 5, and thereby absorbs the thermal expansion of the kiln main body 1. Further, in FIG. 6, thermal expansion is absorbed by a flat spring 3b attached obliquely to the kiln body 1.

Problems to be solved: As mentioned above, springs have traditionally been used to connect the kiln body 1 and the tires 2, but the disadvantages of springs are that they fatigue over time and that they may break due to distortion. is always present.

Means for solving the problem: In the present invention, a spring is not used as a connecting fitting, and instead, several rods 5 having holes at both ends are used, and one end of each is rotatable to the kiln body. The shaft is attached to the shaft, and the other end is rotatably attached to the tire, so that the decrease in the radial gap due to thermal expansion of the kiln body is absorbed by increasing or decreasing the radial inclination of the rod and by rotating the kiln body. do.

That is, the present invention has several holes 1b drilled in the flange 1a provided at the tire attachment part of the kiln body 1 at equiangular positions with respect to the axis of the kiln body, and a rod 5 having holes at both ends. A hole 5a at one end is rotatably connected by a pin body 6; a hole 5b at the other end of the rod and the above-mentioned hole 1b bored in a flange 2a provided on the inner circumference of the tire 2. This is a rotary kiln in which holes 2b of the same number and at equal angular positions are rotatably connected by a pin body 7.

Effect: When a rod is used to connect the kiln body and the tire, the expansion of the kiln body is absorbed by the increase in the inclination of the rod in the radial direction. In this case, a circumferential deviation occurs in the cross section between the kiln body and the tire, but this does not affect the performance of the rotary kiln.

On the other hand, the rod 5 does not need to have elasticity, so there is no problem due to exceeding the yield point or elastic fatigue. In other words, a material with sufficient strength can be used without considering elasticity.

Example: FIG. 7 schematically shows the structure of a rotary kiln. Although some devices use electric heat instead of fuel as a heat source, it goes without saying that the present invention is applicable regardless of the heating source (as this is a well-known structure, detailed explanation will not be given).

In FIG. 1, a flange 1a is provided around a tire mounting portion of a kiln body 1. Flange 1
In a, several holes 1b are arranged so as to form the same central angle (the essential condition is that the holes 1b are fixed to the kiln body, and only the hole part is a protruding cutout). It goes without saying that the cutting flange type body can be used.)

One end 5a of a rod 5 having holes 5a and 5b at both ends is pivotally attached to each hole 1b by a pin 6, and the hole 5b at the other end of the rod 5 is provided in the inner flange 2a of the tire 2. It is pivotally attached to the hole 2b by a pin body 7. It goes without saying that the number of holes 1b, the number of rods 5, and the number of screw holes 2b are equal.

The kiln body 1 and the tire 2 are fixed together by a rod 5. Assuming that the tire 2 does not deform, if the kiln body 1 thermally expands, the angle between the rod 5 and the radial direction will change. In addition, the tire 2 rotates relative to the kiln main body 1 in the cross-sectional reference circumferential direction to absorb the strain. Therefore, it is possible to cope with the expansion and contraction of the kiln main body 1 without using an elastic body (spring). FIG. 3 shows the position of the solid line when the kiln body 1 is at a low temperature, the position of the dotted line when it thermally expands, and the state where the inclination angle of the rod 5 with respect to the radial direction increases accordingly.
FIG. 2 or 3 shows an example of the rod 5. In this case, the rod 5 has a flange 1a, a flange 2
Although it is bifurcated with a in between, it is effectively the same as a single rod.

Effects of the invention: As described above, the invention does not use the spring effect of the elastic body to connect the kiln main body and the tire. Therefore, there is no concern that the connecting body will break due to elastic fatigue.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a rotary kiln showing the structure of the present invention. FIG. 2 is a diagram showing an embodiment in which the kiln main body and the tire are connected by a rod via a pin. FIG. 3 is an explanatory diagram showing, in dotted lines, the behavior of the rod when the kiln main body expands. 4 and 5 show an example of a conventional connecting fitting, with FIG. 4 being a cross-sectional view and FIG. 5 being a partially enlarged view thereof. FIG. 6 is a diagram showing another conventional connecting fitting. FIG. 7 is a diagram showing the general structure of a rotary kiln. 1...Kiln body, 2...Tire, 3...Connection fittings,
4... Annular part, 5... Rod body, 6, 7... Pin.

Claims (1)

[Claims for Utility Model Registration] A flange 1a provided at the tire mounting portion of the kiln body 1, each having several holes 1b drilled at equiangular positions with respect to the axis of the kiln body, and a rod having holes at both ends. The holes 5a at one end of the body 5 are rotatably connected by a pin body; the holes 5b at the other end of the rod body 5 are arranged on the inner circumference of the tire 2, and the same number of holes and at the same angular position as the holes 1b are provided. A rotary kiln characterized in that the holes are rotatably connected to each other by a pin body.