JPS59143826A - Detection of clogging of silo with stored material - Google Patents

Abstract

PURPOSE:To permit efficient detection of clogging of a delivery port due to fixed solidification of stored material by judging the clogging from the decrease of the current value which is generated when a rotary plow is idle-revolved, during the delivery operation for the stored material by the rotary plow. CONSTITUTION:The powdered material stored is delivered from a delivery port formed in the circumferential direction between the hopper part 1a of a silo body 1 and the lower part of a cone 2 and loaded with a repose angle onto the table part 1b of the silo body 1 and raked-out by a rotary plow 3. In this case, when arch phenomenon is generated in the powdered material, the rotary plow 3 is put into no-loaded state, and the electric current reduces. Therefore, an antibreaker A is operated by utilizing said current reduction signal, and water is allowed to flow from a water conduit 4, and air is jetted-out from an air conduit 5, and the arch phenomenon of the powdered material is destroyed. Therefore, the clogging of the delivery port due to the arch phenomenon of the powder material can be detected immediately, and said clogging can be destroyed immediately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting blockage of a discharge port in a silo due to stored material such as coal.

In silos that store granular materials such as coal, if the stored coal is left for a long period of time, it will dry out and the coals will solidify together, blocking the outlet (arching phenomenon) and causing the core to flow out. coal may not be able to be discharged. Hitherto, no means has been developed to automatically detect the location where such arches occur, and the reality is that workers have no choice but to detect them through patrol inspection or visual observation.

The present invention has been made in view of the above circumstances, and is a simple yet rational means, specifically, to reduce the current value that occurs when the rotary plow idles during dispensing operation using the rotary plow. A detection method that solves the conventional problem by detecting that there is a blockage of the dispensing port due to solidification of powder or granules in the location where the plow is present, and that countermeasures such as immediately breaking up the blockage can be taken. This aims to improve the dispensing efficiency of powder and granular materials.

An embodiment of the detection method of the present invention will be described with reference to the drawings.

Generally, in this type of silo, the stored granular material such as coal is stored in a part of the hopper (/α) of the silo body (1).
and the lower part of the cone (2), it flows out from the dispensing port in the circumferential direction formed between the cone (2) and the table part (yb) of the silo body (1).
) is placed on top with an angle of repose. The powder scraped out by the rotary plow (3) K that rotates and revolves along the upper surface of the table part (yb) is supplied onto a circular conveyor or a turntable (not shown) and delivered to a predetermined location. At this point, it is sent onto a delivery conveyor (not shown) and carried out to the outside of the silo. Then, when the powder and granules on the table part (/2) are scraped out by the rotary plow (3) as shown in figures f and y, the silo body (1
) is flowed onto the table part (yb) until the angle of repose is maintained.

During such powder and granular material discharging operation, as shown in the figure, an arch phenomenon occurs and the rotary plow (3) idles, that is, becomes unloaded. The current value of the drive system (not shown) drops rapidly. As shown in Fig. 5, this current drop signal is applied to a cathode ray tube or recording paper provided in the circuit by a straight line α.
will be displayed as .

Incidentally, when the rotary plow (3) is scraping out powder and granules, the current value is displayed as a small waveform line as shown in Fig. 5. In this way, when the current value is displayed as alpha rays, it can be known that the rotary plow is in a idling state, in a pongee state, or in an arch-occluded portion.

As shown in Figure 6, the rotary plow current signal when the current value is in the α-ray state is converted from current to voltage, this voltage is applied to the Schmitt circuit, and the circuit (emits an output signal, This output signal is transmitted as an action signal of the arch breaker A, and water flows out from the water pipe (4) constituting the arch breaker A, and the air pipe (5)
Low-pressure air below IO atmosphere is ejected from the arch, and the arch in the area collapses due to the anti-caking action of water and the ejection pressure of the low-pressure air. The arch breakers A are installed at appropriate intervals for the hopper part (/α) of the silo body (1) as shown in the diagram, and all the arch breakers are controlled by the current signal when the rotary plow is idle. It is optional whether the arch breaker -A is activated or only the arch breaker -A near the arch portion is activated. Further, the arch breaker A may be provided at the lower part of the cone (2) provided in the silo body (1), as shown by the imaginary line in the diagram.

To explain the Schmitt circuit 9 above, any voltage V
, if a voltage VL greater than η is input as a signal, a signal will be emitted, and if a voltage smaller than Vl is input as a signal, no output signal will be emitted. Therefore, by setting a voltage between the voltage signals when the rotary plow 9 is idling and when it is plowing out as vl, the presence or absence of the rotary plow load is converted into an ON-OFF signal.

As described above, according to the present invention, when the rotary plow is performing the scraping operation normally, the current value is displayed as a waveform line with /t increments, and this can be known.
Also, when the current value decreases and a linear display is made, the rotary plow idles and it can be immediately known that there is an arch blockage in the core. Since the arch at the relevant location can be immediately collapsed using an arch breaker or the like, it has excellent features such as improving the efficiency of discharging the powder and granules.

[Brief explanation of the drawing]

Figure 3 is a partially cutaway front view of the silo body, Figure 3 is a partially cutaway plan view of the rotary plow section showing the normal plowing state, Figure 3 is an enlarged view of a portion of the same as above. Cross-sectional view and crucible.Figure 5 is a current value one-hour characteristic diagram of the rotary plow drive system.2. ! Figure 6 is an arch breaker operating circuit diagram. (1)...silo body, <ia)...hopper s, (ib)...table section, (2)...cone, (3)...rotary plow. Patent applicant: Kawasaki Heavy Industries, Ltd. Figure 1 Figure 4 Figure 2

Claims (1)

[Claims] A rotating rotary plow scrapes out coal and other granular materials on the table of the silo body at an angle of repose from the outlet formed around the entire circumference between the hopper part of the silo body and the lower part of the cone. When discharging this from a predetermined location to the outside of the silo body, a drop in the current value that occurs when the rotary plow is idling and under no load is detected, and the solidification of powder or granules is detected at the location where the rotary plow is present at the time of detection. 1. A method for detecting blockage of stored material in a silo, the method comprising: detecting blockage of a dispensing port.