JPS5929048A - Crusher 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 an apparatus for pulverizing solid materials such as coal, and more particularly to a pulverizing apparatus that allows easy confirmation of the thickness of a layer of pulverized material in a pulverizing section within the apparatus.

Due to recent changes in the fuel situation, the value of coal as a fuel has been reconsidered, and large boilers for thermal power plants are now used, and even for large boilers for business use, a considerable number of boilers that co-fire with heavy oil or burn exclusively with coal are being used. ing. In this case, from the viewpoint of increasing the efficiency of coal combustion and improving controllability, a method is adopted in which the coal is pulverized to a predetermined particle size and then transported by airflow to the burner section. There are various particle sizes of pulverized coal, but pulverized coal usually has a 200 mesh passage rate of 70% to 80%.

FIG. 1 shows a ball mill, which is one type of pulverizing apparatus for pulverizing coal. In the figure, coking coal C falling down coal feed pipe 1
reaches the crushing section shown by arrow 2, where it is crushed. The crushing section 2 is fixed at the upper part @8. Pressure is applied by a pressurizing device 11 such as a hydraulic cylinder. It is composed of a lower roller 3 rotated by a drive device 12, and grinding balls 7 arranged between the upper fixed wheel 8 and the lower roller 3. The coal crushed in the crushing section 2 is dried by the heated air A supplied from the air port 4, and is transported by airflow to the section of the classifier 14, where swirling energy is applied by the guide vanes 5 provided in this section. available. Classification? The coal flowing into H14 is centrifugally separated by this swirling flow, and particles 11 having a predetermined particle size or more descend while swirling on the inner wall of the classifier 14, and are re-pulverized in the crushing section 2. On the other hand, pulverized coal of low quality flows into the pulverized coal pipe 6 along with the airflow and is transported by the airflow to a predetermined device such as a burner.

In the above apparatus, a coal bed 25 of pulverized coal is formed between the ball 7 and the lower roller 3 with a predetermined thickness t, as shown in FIG. Since the thickness t of this coal seam greatly affects the crushing ability of the device, it is necessary to constantly detect it during operation of the crusher. In general, the thickness t of the coal seam shows a tendency to increase in response to a decrease in the revolution speed of the rolling ball, as shown by line A in FIG. Therefore, in theory, it is possible to detect the thickness of the coal seam by detecting the entire revolution speed of the balls, but in reality, depending on the type of coal and the load on the device, the characteristics shown in FIG. 2 are not necessarily exhibited. Therefore, in reality, this method is not adopted, but the power consumption of the drive device (electric motor) that drives the lower roller 3 is calculated, and the thickness of the coal seam is calculated based on this. However, this method also indirectly detects the thickness of the coal seam and cannot be expected to detect with high precision. In particular, when the thickness of the coal seam exceeds a predetermined value, it becomes difficult to transfer the balls 7, but it is also very difficult to detect such a state using the conventional method described above.

The object of the present invention is to eliminate the above-mentioned problems and provide a crushing device that can accurately detect the thickness of a coal seam.

In short, this invention focuses on the fact that the pressurizing device that presses the upper fixed ring moves up and down in response to the thickness of the coal seam, and a device that detects and displays the vertical movement of the pressurizing device with respect to this pressurizing device. It is configured to directly detect the thickness of the coal seam.

This invention will be explained in detail below.

In FIG. 4, the pressurizing device 11 includes a movable cylinder 11b that moves up and down in conjunction with a shaft 7) 11a that applies a pressing force directly to the upper fixed ring 8, and a fixed cylinder 11c installed on the housing 20 side. 13 is the movable cylinder 11b and the fixed cylinder I
It is a hollow that absorbs displacement relative to Q. Reference numeral 18 denotes a support plate with one end attached to the moving 1llb side, and the instruction side 22 is attached to the other end. On the other hand, a scale plate 23 is provided on the side of the fixed cylinder 11c. Since the movable cylinder 11b moves in accordance with the thickness t of the coal seam 25 between the ball 7 and the lower roller 3, the thickness t of the coal seam can be easily determined by reading the scale indicated by the indicator 122. It can be confirmed. In this case, if changes in the movement of the pointer 22 are recorded in the record Ml' 21, important data for detecting the operating state of the device can be obtained.

By carrying out this invention, the moving state of the pressurizing device can be detected, and thereby the thickness of the coal seam can be directly detected, so that the operation of the crushing device can always be controlled in an even manner.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a crushing device using grinding balls, Fig. 2 is a diagram showing the relationship between the thickness of the coal seam and the revolution speed of the balls, Fig. 3 is a schematic diagram showing the arrangement of the coal seam, and Fig. 4 5 is a detailed front view of the section A in FIG. 4, and FIG. 6 is a detailed side view of the section A in FIG. 4. 3...-F section roller 7...Crushing ball 8...Upper fixed wheel 11...Pressure device 12...Drive Device 11b...Moving barrel 11c...Fixed barrel 18...Support plate 21...Record 81 22...Indicator 1 23... ...scale plate

Claims (1)

[Claims] 1. Force [an upper fixed wheel pressurized by a grouping machine, a lower rolling wheel rotated by a drive device, and a grinding wheel placed between the upper fixed wheel and the lower rolling wheel. In a device that crushes objects to be crushed by a pressurizing device, a support plate with an indicator &1 on one end is attached to the movable tube of the pressurizing device, and a scale plate is attached to the fixed tube, and the movable tube is moved. A pulverizing device characterized in that the thickness of a layer of the pulverized material is displayed by displaying an instruction Φ1 that moves in response to the pulverized material. 2. Connected the recording device to the MtJ indication button. A crushing device Et according to claim 1, characterized in that: