JPS5849481A - Washing of rotary screen apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning method for removing particulate matter adhering to the inner surface of a casing of a rotary sieve device. As a rotary sieve device for powder and granular materials, the one shown in FIG. 1, for example, is known.

In the drawing, the vertical rotating shaft 2 is rotated by the driving force from the belt 1, and the pulley 4 is rotated 20 times around the rotating shaft by the driving force from the belt 3, thereby forming the flexible joint 5 and the raw material supply plate. 6. The cylinder body consisting of the shaft sheath 7 and the cylindrical sieve mesh 8 pivots around the eccentric rotating shaft 2 and at a faster speed than the shaft rotation speed. For this reason, the cylindrical sieve screen 8 is subjected to vibrations caused by rotating and turning around the circumference of the eccentric rotating shaft 2.

While rotating the sieve screen as described above, wet raw coal to be classified is supplied from the 9 raw material supply ports, and the coking coal is constantly exposed to the inner surface of the cylindrical sieve screen 8 due to centrifugal force, vibration force, and gravity. They collide without any problem, are bounced off and fall off, and during this time, materials smaller than fine particles pass through a sieve screen and are classified. The classified raw materials, over and under, are discharged from passages JO and 11, respectively.

A hole 16 is drilled in the upper part of the casing 12, through which a compressed air supply pipe 17 passes 1, and a plurality of downstream injection nozzles 18, 18' along the entire length of the supply pipe 17.

18'', and the nozzles 18.18', 18''...
The tip of * is opposed to the outer surface of the cylindrical sieve screen 8. These nozzles have the function of injecting air supplied at a predetermined pressure from a compressed air supply source (not shown) as an end stream.

The upper part of the supply pipe 17 protrudes from the casing 12, and a guide member 19 is provided upright on the upper part of the casing 12.
It is slidably supported by. In addition, the supply pipe 17
An arm 2o is fixed to the protrusion of the casing 12, and the arm 20 is a piston rod of a fluid pressure cylinder 21 fixed to the side of the casing 12.

It is connected to 22. When the fluid pressure cylinder 21 is operated, the supply pipe 17 moves up and down, and accordingly, the nozzle 18
, 18', 18''... move up and down along the outer surface of the cylindrical sieve screen 8. These nozzles 18, 18'.

The range of movement of the hydraulic cylinder 21 is controlled by limit switches 23, 24 provided on the guide member 19 so as to define its upper and lower limits.

The installation position of the compressed air supply pipe 17 in the sieve machine circumferential direction is preferably near the inlet side of the raw coal supply port 9. This is because by installing the button in this position, the sieve screen is further cleaned before raw coal is supplied into the sieve screen from the button.

Furthermore, since the coking coal supplied from the coking coal supply port 9 has a high proportion of contact with the upper part of the sieve screen, it is desirable that the nozzles installed in the compressed air supply pipe be installed in the upper part of the limb pipes with small intervals. .

However, when wet coal is sieved in series using the rotary sieve device as described above, wet coal adheres and accumulates on the inner surface of the casing 12, eventually making operation impossible. Therefore, the cost is to remove this deposit during suspension of operation, but the manual method requires a large workload and takes a long time, and it is difficult to remove it by simply spraying force fluid toward the deposit. It was something.

As a result of studies in view of the above points, the present invention utilizes the original function of the rotary sieve device to supply a cleaning liquid such as water into the rotating cylindrical sieve screen, and violently directs water from the screen toward the inner surface of the casing. The inventors have discovered scales that can be easily and uniformly removed in a short period of time by scattering the scales and washing off the deposits.

An apparatus for carrying out the method of the present invention is also shown in the drawings. In the figure, reference numeral 25 denotes a washing water pipe, which faces onto the raw material supply plate 6 inside the cylindrical sieve screen, and has a nozzle 26 at its tip. During the wet coal sieving operation, if wet coal adheres and accumulates on the inner surface of the casing 12, the wet coal sieving operation is temporarily stopped and the cleaning liquid is poured from the nozzle 26 while the cylindrical sieve screen is rotating. When supplied, the cleaning liquid passes through the mesh due to the rotation of the raw material supply plate 6 and the mesh 8, and collides with force toward the inner surface of the casing 12, thereby effectively removing deposits.

Example particle size 3+a+ or more 30 inches, 3■ or less 70 inches, total water content about 1
0% coking coal was fed as it was from the top of the rotating cylindrical sieve screen shown in the drawing. The height of the sieve screen is 12m and the mesh size is 3m.
It is.

Air was injected toward the outer surface of the cylindrical sieve screen at a pressure of 5.5 kg/32 from a compressed air supply pipe in which eight nozzles with a hole diameter of 3.2 m were arranged at a pitch of 150 m. This tail stream was continuously moved up and down in the height direction of the sieve screen in a round trip of 20 seconds.

During continuous operation for 4 hours at a processing capacity of 1 Q There was no blind spot.

When 2,000 pieces were processed in this way, a large amount of wet coal adhered to the inside of the casing, making sieving difficult.When the method of the present invention was carried out under the following conditions, the adhering material could not be completely removed. (1) Operating conditions of the rotary sieve device: Number of revolutions of the rotary sieve screen: 55r, p, m (2) Washing water supply conditions: 22.51/min x 4 locations (3) Washing time: 3 minutes or more Detailed information According to the present invention, (=) it is possible to reduce the number of personnel (b) it is possible to reduce labor 1, it is possible to improve the working environment (c) it is possible to greatly shorten the cleaning time, and it is possible to improve T/)l, etc. It was effective and greatly contributed to the sieving work of powder and granular materials.

[Brief explanation of drawings]

The drawing is an explanatory cross-sectional view of an apparatus for carrying out the method of the present invention.

Claims (1)

[Claims] In a rotary sieve device that performs sieving work by supplying powder to a cylindrical sieve screen that is rotating inside a caning, cleaning liquid is supplied to the cylindrical sieve screen that is rotating in an empty state where no sieving operation is being performed. A method for cleaning a rotary sieve device, characterized in that deposits on the inner surface of a casing are removed by a cleaning liquid splashed from a mesh.