JPH0691228A - Classification of coal - Google Patents

Abstract

PURPOSE:To dispense with the manual cleaning work of a screen and to classify coal while efficiently removing the coal bonded to the screen. CONSTITUTION:The scraping plates 4 attached to a support rod 6 in a rotatable manner and positioned so that the contact parts with the screen 2a thereof obliquely cross the screen 2a are moved on a screen net 2 by a drive source while brought into contact with the screen 2a. The scraping plates 4 are moved up and down corresponding to the vibration of the screen net 2 to move so as to beat the screen 2a and removes the coal bonded to the screen 2a to classify the same in parallel to the removal of the coal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for classifying coal while efficiently removing coal adhering to the screen of a classifying sieve.

[0002]

BACKGROUND ART It is known that coking coal for producing coke improves the strength of the coke obtained by making the particle size distribution uniform. Classifying is done. Coal classification is generally carried out by supplying raw material coal onto a sieve mesh provided in multiple stages and vibrating the sieve mesh to divide it into fine grain portions and coarse grain portions. However,
Since the raw coal usually contains about 8 to 10% of water, the raw coal adheres to the screen of the screen,
This will reduce the classification efficiency of coal. Therefore, it is necessary to regularly stop the classification operation and manually clean the screen. It is an object of the present invention to provide a method for classifying coal while eliminating the manual cleaning work of the screen as described above and efficiently removing coal adhering to the screen.

[0003]

As a result of various studies to solve the above-mentioned problems, the present inventors moved a predetermined scraping plate on the screen by a driving source while contacting the vibrating screen. As a result, it was found that the coal adhering to the screen can be efficiently removed while the coal is classified, and the present invention has been completed. That is, the gist of the present invention is to supply coal onto a vibrating screen-type classification sieve mesh to perform classification, and the movable portion that can move according to the vibration of the sieve mesh and the abutting portion with respect to the screen diagonally moves the screen. A scraping plate positioned so as to cross, by moving the sieve source by a drive source while being in contact with the screen, in the classification method of coal characterized by performing the classification of coal while removing the coal adhering to the screen Exist.

[0004]

[Function] The scraping plate that moves on the screen by the drive source moves up and down according to the vibration of the screen and hits the screen,
Further, since the abutting portion with respect to the screen moves so as to be diagonally across the screen, the coal adhering to the screen is easily removed while the coal is classified.

[0005]

EXAMPLES Specific examples of the method for classifying coal according to the present invention will be described below with reference to the drawings together with the apparatus. 1 is a side sectional view schematically showing a screen type classifying sieve, FIG. 2 is a perspective view showing a configuration example of a scraping plate portion, FIG. 3 is a side view showing a contact mode between a scraping plate 4 and a screen 2a, and FIG. FIG. 5 is a plan view for explaining the correspondence between the scraping plate 4 and the screen 2a, FIG. 5 is a plan view for explaining the operation of the scraping plate 4 moving on the screen 2a, and FIG. 6 is a front view for explaining the operation of the scraping plate 4. .

As shown in FIG. 1, the classifying screen 1 is provided with a harp type screen screen 2 in multiple stages with an inclination, and the whole is vibrated by a vibration motor 3. As shown in FIGS. 2 and 3, the scraping plate 4 that moves on the sieve screen 2 is rotatably attached to the support rod 6 via the connecting member 5 with the pin 7 and is adapted to respond to the vibration of the sieve screen 2. The scratch plate can move. Usually, a plurality of scraping plates 4 are attached to one support rod 6, and are attached to each of the screens 2 of each stage. Usually, the scraping plate 4 is preferably made of resin such as polyethylene, and the connecting member 5 and the supporting rod 6 are used.
Is usually made of steel, stainless steel, etc.,
In particular, the material is not limited.

As shown in FIG. 3, the scraping plate 4 is slightly tilted with respect to the screen 2a surface of the sieve mesh from a right angle, and is preferably contacted so that the angle θ shown in FIG. 3 is usually 70 to 80 °. . This is to make it easier to scrape the coal adhering to the screen. Further, as shown in FIG.
Is arranged so as to cross the screen 2a obliquely with respect to the direction of the screen 2a (arrow a in the figure). The angle (shown as δ) is usually 30 to 6
About 0 ° is preferable. This is so that a large number of screens can be touched at the same time.

Further, an example of the method of the present invention will be described with reference to FIGS. The screen 2 is composed of a harp type screen 2a made of stainless steel. The distance between the screens 2a is about 6 to 8 mm. This sieve screen 2 is structurally connected to a vibration motor and is vibrating. Raw coal is sieve mesh 2
It is supplied from a supply port above and is classified into fine particles and coarse particles by the sieve mesh 2. Three scraper plates 4 are attached to both sides of the support rod 6 so as to cover almost one length of one side of the screen, and the support rods 6 are connected to a drive source (motor) via a drive chain or the like. (Not shown), the scraping plate 4 reciprocates on the screen in a direction perpendicular to the direction of the screen 2a (direction of arrow in FIG. 5) at a speed of about 1 to 2 m / min. The scraping plate 4 is attached so as to form an angle of about 75 ° (θ in FIG. 3) with respect to the surface of the screen 2 and an angle of about 45 ° (δ in FIG. 4) with respect to the direction of the screen 2a. ing. When the scraping plate 4 is moved by the drive source, the scraping plate 4 moves up and down (the direction of the arrow b shown in FIG. 6) in response to the vibration of the screen 2a (the direction of the arrow a shown in FIG. 6), and strikes the screen. Then, it moves while removing coal adhering to the screen 2a, and in parallel with this, classification is performed. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

[0009]

As described above, according to the method for classifying coal of the present invention, the coal adhering to the screen of the screen can be efficiently removed while classifying the coal, and the screen can be manually cleaned. No work required, and
Since the scraping plate can be moved by directly connecting it to the drive unit without interposing a cylinder or the like, the cost and labor required for maintenance and operation of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view schematically showing a screen type classification sieve.

FIG. 2 is a perspective view showing a configuration example of a scraping plate portion.

FIG. 3 is a side view showing a contact mode between a scratch plate 4 and a screen 2a.

FIG. 4 is a plan view illustrating a correspondence relationship between a scratch plate 4 and a screen 2a.

FIG. 5 is a plan view for explaining the operation of the scratch plate 4 moving on the screen 2a.

FIG. 6 is a front view for explaining the operation of the scratch plate 4.

[Explanation of symbols]

1 classification screen 2 screen 2a
Screen 4 Scratch plate 5 Connecting member 6 Support rod

Claims (1)

[Claims] 1. When supplying coal onto a vibrating screen-type classification sieve screen to perform classification, it is possible to move in response to vibration of the screen and the contact portion with the screen diagonally crosses the screen. A method for classifying coal, wherein a scraping plate located on the screen is moved by a driving source while being brought into contact with the screen to remove coal adhering to the screen while classifying the coal.