US3436062A

US3436062A - Supporting device for rotary multiple-support kilns

Info

Publication number: US3436062A
Application number: US619295A
Authority: US
Inventors: Georgy Vladimirovich Raevsky
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-02-28
Filing date: 1967-02-28
Publication date: 1969-04-01
Anticipated expiration: 1986-04-01

Description

A ril 1, 1969 G. v. RAEVSKY SUPPORTING DEVICE FOR ROTARY MUTIPLE-SUPPORT KILNS Filed Feb. 28, 1967 United States Patent 3,436,062 SUPPORTING DEVICE FOR ROTARY MULTIPLE- SUPPORT KILNS Georgy Vladimirovich Raevsky, per Mechnikova 3, kv. 6, Kiev, U.S.S.R. Filed Feb. 28, 1967, Ser. No. 619,295 Int. Cl. F27b 7/22; F16c 41/02 U.S. Cl. 263-33 4 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to supporting devices for rotating multiple-support kilns.

It is known in the prior art to provide multiple-support rotating kilns which rest on a plurality of rigid roller supports. In such kilns, because of the sagging of the supports and warpage of the kiln due to local overheatings, there occurs an eccentric vibration of the supporting rings or rollers relative to the roller supports. As a result, there is an overloading of a number of supports at the expense of an underloading of other supports. In addition, there is a non-uniform distribution of the load between the rollers within one support. When such kilns operate, there is a non-uniform wear of the supporting rollers and rings, a failure of the supporting rollers, a falling out of the refractory lining, and a failure of the kiln body. This is especially marked in furnaces of large diameters, possessing a considerable rigidity of their body.

In due course, there was proposed a supporting device complete with piston hydraulic dampers which was provided between the supporting rollers and permitted the rollers to be drawn apart and brought together in relation to the load acting upon the supports. Such a design of the supporting device eliminated many disadvantages pertaining to furnaces on rigid supports but was not free from objectionable characteristics. Firstly, to provide for a required value of support reactions, it is necessary to set up high pressures. Secondly, to maintain the pressure in the hydraulic system, there is required a fairly complicated automatic device.

Moreover, piston hydraulic jacks require a thorough packing and careful observance of their operation. A particular disadvantage is the impossibility of controlling the value of the support reaction on separate supports when the loading duty is varying during the operation of the kiln without the shutting down thereof.

An object of the present invention is to eliminate the above-mentioned disadvantages with the preservation of favorable qualities of the construction as above described.

The principal object of the present invention is to provide such a design of the supporting device of a rotating multiple-support kiln, which compensates for the eccentric pulsation of the supporting rings of the kiln without considerable overloads of the roller supports and the overstraining of the kiln body.

Another object of the invention is to distribute uniformly the load between the supports and between the 3,436,062. Patented Apr. 1, 1969 rollers within one support, as well as permitting at low pressures and without the use of complicated means, the

control of and maintenance of the supporting reactions of the specified value on all the supports taken together grl on each support separately without shutting down one The foregoing objects are achieved due to the fact that the damping supports of the device comprise pneumatic cushions interconnected into one common pneumatic system or into a number of group systems with the latter being convenient in a situation in which arises a necessity for varying the value of the support reaction in a plurality of neighboring supports or in a separate support.

To maintain a constant value of supporting reactions, a receiver is connected into a system of pneumatic cushions or to each separate group.

The nature of the present invention will become more fully apparent from a consideration of the following descrrption of an exemplary embodiment thereof, taken in conjunction with the accompanying drawings, in which:

Flt}. 1 is a diagrammatic view of a multiple-support rotatmg kiln on a supporting device according to the present invention;

and

FIG. 3 is a view partly in elevation and partly in section of a pneumatic cushion.

The body of multiple-support rotating kiln 7 (FIG. 1) rests by means of axially spaced rings 2 on supporting rollers 3 mounted on a movable frame 4 (FIG. 2). The movable frame 4 rests on pneumatic cushions 5, and transmits through such cushions a load on the foundation. The pneumatic cushions 5 are interconnected by means of pipe-lines 6, and to a receiver 7 so as to form a common pneumatic system.

From a compressor (not shown), air under pressure is supplied into the pneumatic system, and the value of the pressure is determined by a pressure gauge 8 provided for the receiver 7.

Each pneumatic cushion 5 consists of a metallic bottom 9 (FIG. 3) and diaphragm 10 of a rubberized cloth.

Due to the presence of a pressure in the pneumatic system, the movable frame 4 together with the supporting rollers 3 is always pressed to the rings 2. In the operation of the kiln, when the supports sag, the adjustment of supporting rollers is broken, or the shape of the kiln is distorted because of local overheatings, and an eccentric pulsation of the rings occurs. The pneumatic cushions 5 allow the movable frame and the rollers mounted thereon to repeat all the displacements of the rings during their pulsation, and contribute to an improvement of the contact between the rolling surfaces of the rings and supporting rollers.

When the position of the diaphragm 10 varies after the movable frame, the volume of the pneumatic cushion is also likely to vary. Yet, since the volume of the receiver 7 is much greater than the volume of all the pneumatic cushions 5, the variation of the volume of the entire pneumatic system is fairly insignificant. At a constant temperature and a small variation of the volume of air in the pneumatic system, the pressure accordingly also varies to a small extent. Due to a variation in the receiver volume, one can achieve such a position when the pressure in the pneumatic system will remain practically constant with the volume of the pneumatic cushions varying.

Therefore, with the surface areas of the diaphragms 10 of the pneumatic cushions 5 remaining constant and the pressure in the pneumatic system being practically constant, there is maintained substantially a constant value of the supporting reaction on each support,

Since the diaphragm of the pneumatic cushion possesses a fairly great surface area and each support is provided FIG. 2 is a view taken along the line IIII of FIG. 1;

with a plurality of pneumatic cushions, high pressures are not necessary to effect the required value of the supporting reactions.

It is expedient to unite the pneumatic cushions of each support into an independent system complete with the receiver. In this case, it is possible, when varying the pressure in the system, to control the value of the supporting reaction in each support separately without any shutdown of the kiln.

The present supporting device is capable of ensuring, without the use of any complicated appliances, the maintenance of a practically constant value of the supporting reaction, and enables the use of low pressures in the system. It is simple to service, reliable in operation, and allows the control of the value of the supporting reactions without a shutdown of the kiln, thereby resulting in an increase in the service life of the refractory lining and in the coetficient of efficiency of the rotating kiln.

What is claimed is:

1. In a kiln assemblage, a rotatable body provided with a plurality of axially spaced rings, a set of rollers on which each ring rides for supporting said rotatable body, a movable frame on which each roller set is mounted, a damping pneumatic cushioning means on which each movable frame rests, and a pneumatic system connecting said pneumatic cushioning means whereby said sets of rollers are capable of upward and downward movements as well as inclining movement in a vertical plane parallel to the longitudinal axis of the rotation of the body thereby providing uniform contact between the sets of rollers and the rings.

2. The kiln assemblage according to claim 1, wherein said pneumatic cushioning means are interconnected in such a manner as to form a number of separate group pneumatic systems.

3. The kiln assemblage according to claim 1, wherein a. receiver is included in said pneumatic system.

4. The kiln assemblage according to claim 2, wherein a receiver is included into each group pneumatic system.

References Cited UNITED STATES PATENTS JOHN J. CAMBY, Primary Examiner.

US. Cl. X.R. 3 089