JPS638635Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a blockage-resolving device for breaking the blockage caused by the bridging phenomenon of discharged coal in the discharge hopper of a coal storage silo to ensure smooth discharge. In other words, whether the cause of coal discharging has stopped is that the stored coal in the hopper has run out, or that a blockage phenomenon such as a bridge has occurred, is checked and the breaker is activated only in the latter case. The present invention relates to a blockage eliminating device configured to destroy blockage phenomena and enable smooth coal discharge.

BACKGROUND ART Conventionally, a problem with discharging hoppers of coal storage silos and the like has been that it is difficult to smoothly discharge them due to clogging of the contents such as coal, and various methods and devices have been proposed to prevent bridging or eliminate clogging. (For example, JP-A-53-57670, JP-A-54
−88558, Japanese Patent Application Publication No. 143283, Japanese Patent Application Publication No. 1983-
(as described in Publication No. 55225).

By the way, the causes of stopping the discharging of coal or the like from the hopper can be broadly classified into two cases: a blockage phenomenon, and a case where there is no longer any coal or the like stored in the hopper.

However, the bridging elimination method described in Japanese Patent Application Laid-Open No. 54-88558 is configured to eliminate bridging by blowing pressurized gas when the occurrence of a cavity due to blockage is detected.

In addition, the anti-bridging silo described in Japanese Utility Model Application Publication No. 56-55225 uses a level meter to detect the level of powder and granules, and when the level drops below the level at the time of input, it is assumed that bridging has occurred. The structure is designed to prevent bridging by blowing air through a diffuser pipe installed at the bottom of the silo.

Problems to be Solved by the Present Invention () In the case of the bridge elimination method described in the above-mentioned Japanese Patent Application Laid-Open No. 54-88558, even if the cavity detector detects a cavity, it does not mean that there is no object in the hopper. There is a problem in that it is difficult to distinguish whether it is due to aging or if a truth void has occurred.

Furthermore, if a cavity phenomenon occurs in a region outside the detectable range of the cavity detector, there is a problem that the cavity detector is completely useless.

() In the case of the bridging prevention silo described in Japanese Utility Model Application Publication No. 56-55225, it is a rough method that simply detects the phenomenon in which the level of the stored material has dropped and assumes that bridging has occurred.
It is not possible to distinguish whether the level of the contained material has decreased because the contained material has compacted or, for example, because the contained material has leaked out, and if the latter is the cause, bridge prevention measures should be taken. Air will be blown out from the diffuser plate for purposes other than those intended.
In this case, there is no way that the level of the stored material will return to its original level, so the diffuser plate continues to blow out air, which is inefficient and uneconomical.

Furthermore, if the amount of stored material is significantly above or below the level detected by the level meter, there is also the problem that the level meter no longer functions effectively.

Means for Solving the Problems As a means for solving the problems of the prior art described above, a coal storage silo unloading hopper blockage resolving device according to this invention is a preferred embodiment shown in FIGS. 1 to 6 of the drawings. As shown, a level detector 3 and a breaker 4 for the contents such as coal 2 are installed at a predetermined height position on the outer surface of the coal storage silo discharging hopper 1, and a vibration feeder is installed on the lower surface of the feed shooter 6 leading to the hopper outlet 7. 8 was installed, and a flow detector 9 for detecting the presence or absence of delivered coal 2 on the vibrating feeder 8 was installed.

First, the flow detector 9 discharges the coal 2
Second, the level detector 3 detects that the stored coal 2 is present in the hopper 1 up to a certain level, and third, the vibrating feeder 8 is activated. An electrical control system is constructed that automatically operates the breaker 4 through the control panel 5 that processes these detection signals to destroy and eliminate the blockage phenomenon only when all the conditions are met.

Operation The level detector 3 detects whether the coal 2 accommodated in the hopper 1 is present at a detection level.

Flow detector 9 detects whether coal 2 is being discharged through feed shooter 6 or not.

Therefore, although the level detector 3 detects the presence of coal 2 in the hopper 1 and the feed shooter 6 is operating, the flow detector 9 detects that the coal 2 is present in the hopper 1.
If the discharge of coal cannot be detected, it is presumed that a clogging phenomenon (bridging phenomenon) has occurred in the coal stored in the hopper 1.

On the other hand, when the level detector 3 detects that no coal 2 is present in the hopper 1, even if the feeder 6 is operated and the flow detector 9 detects that no coal 2 is present,
Even if no discharge can be detected, it is clear that a blockage phenomenon is not the cause.

When the feed shooter 6 is not operating,
No matter what the detection signals of the level detector 3 and flow detector 9 are, there is no situation that indicates a blockage phenomenon.

In short, the level detector 3 detects the presence of coal 2 in the hopper 1, and the feed shooter 6
is operating and all conditions are met that the flow detector 9 cannot detect the discharge of coal 2, the breaker 4 is operated to ensure that the clogging phenomenon of the stored coal 2 in the hopper 1 is wasted. This allows for smooth dispensing.

Example Next, an example of this invention will be described.

FIG. 1 simply shows the structure of a coal storage silo to which the deblockage device of this invention is applied.

In the figure, 1 is a hopper, 2 is coal contained in the hopper 1, and 3 and 4 are a level detector and an air breaker installed at a constant height on the outer surface of the hopper 1.

As the level detector 1, for example, a capacitance type,
Alternatively, a contact type such as a tuning fork type, or a non-contact type such as a radiation type may be selected and adopted as appropriate.

The air breaker 4 has a tank for storing compressed air and is configured to blow out the compressed air in the tank from an air outlet at once to break the clogging phenomenon of the coal 2. A required number of air breakers 4 are installed at appropriate positions to eliminate the blockage phenomenon, and each air breaker 4 is automatically controlled through a control panel 5. Therefore, the level detector 3 is installed near the air blower of the air breaker 4, detects the presence or absence of coal 2 within the effective range of the air breaker 4, and inputs the detection signal to the control panel 5. It is said that

Next, numeral 6 in the figure is a feed shooter connected to the hopper outlet 7, which is arranged to guide the discharged coal 2 to a conveyor or the like (not shown). 8 in the diagram
A vibration feeder is installed on the lower surface of the feed shooter 6, and this is also automatically controlled through the control panel 5.

9 in the figure is a flow detector that detects the presence or absence of paid coal on the vibrating feeder 8. As shown in detail in FIG. 2 and FIG.
b is attached in the same phase as the fan-shaped signal plate 9c at the outer end of the coaxial, and the signal plate 9 is attached to the outer surface of the feed shooter 6.
A proximity switch 9d is installed within the rotation range of C and faces the signal plate 9c with a gap of about 20 mm. In other words, when the paid coal 2 is not discharged onto the vibrating feeder 8 and the detection plate 9d assumes a vertical position as shown by the dotted line in FIG. 2, the signal plate 9c, which rotates at the same time, approaches the proximity switch 9d. It turns on and generates a signal indicating that coal 2 is not being discharged. Conversely, when the coal 2 is discharged onto the vibrating feeder 8 and the detection plate 9d pushed by the flow of coal tilts to the position shown by the solid line in FIG. 2, the signal plate 9c activates the proximity switch 9d. When the vehicle moves away from the vehicle, the switch 9d is turned off, and its electrical signal is input to the control board 5.

FIG. 4 shows an automatic control sequence diagram of the blockage resolving device.

That is, the switch 1 that starts the vibration feeder 8
When 0 is closed, the relay coil 11 is energized and its a contact 11a is closed. As long as the coal 2 contained in the hopper 1 is at the detection level, the level detector 3 closes the switch 12 and excites the relay coil 13, so that its a contact 13a closes. The flow detector 9 activates a proximity switch 9 when the paid coal 2 is not discharged onto the vibrating feeder 8.
d is closed to excite the relay coil 14, and its a contact 14a is closed.

However, the relay coil 15 that controls the on/off state of the power circuit of the air breaker 4 is connected in series with the three a-contact points 11a, 13a, and 14a. In other words, even if the vibration feeder 8 is operating (A contact 11a is closed) and the level detector 3 detects that the coal 2 is present at a certain level in the hopper 1 (A contact 13a is closed). Regardless, the flow detector 9 detects that a blockage phenomenon has occurred in the hopper 1 only when the following three conditions are met: the discharged coal 2 is not being discharged (the a contact 14a is closed). Under these conditions, the relay coil 15 is energized and the air breaker 4 is activated.
is activated automatically. Conversely, any one or more of the a contacts 11a or 13a or 14
When the air breaker 4 is open, the air breaker 4 is not operated in vain as the above-mentioned closing conditions are not met.

Second Embodiment In the embodiment shown in FIG. 5, a pair of a contact type level detector 3 and an air breaker 4 are installed at two positions above and below the hopper 1, and the coal 2 contained in the hopper 1 is In response to this level, the structure is such that either the upper or lower air breaker is operated accurately to effectively eliminate the blockage.

Third Embodiment FIG. 6 is also an embodiment having the same meaning as the second embodiment, but one non-contact radiation type level detector 3' is installed, and the air breaker 4 has two upper and lower parts. The configuration is such that two units are installed at each location.

Different Embodiments Regarding the breaker for eliminating the coal clogging phenomenon, it is not limited to the above-mentioned air breaker 4, and various types of known types can be adopted. Moreover, the content in the hopper 1 is not limited to coal.

Effects of the Present Invention As described above in detail in conjunction with the embodiments, the coal storage silo blockage release device according to the present invention has the following effects.

The flow detector 9 detects that the delivered coal 2 is not being discharged onto the vibrating feeder 8, and determines whether this is due to the lack of stored coal 2 in the hopper 1 or a blockage phenomenon. This is determined by the function of the detector 3, and the breaker 4 is operated only when it is confirmed that the cause is the latter, eliminating the blockage phenomenon and making it possible to smoothly discharge the coal 2, etc. Such actions can be definitely avoided.

In other words, as long as coal 2, etc. exists in the hopper 1 at the detection level of the level detector 3, the hopper 1
Regardless of where and in what form the blockage occurs, it can be resolved by the action of the breaker 4 and the continuous discharge of the unloaded coal 2 can be automatically and reliably enforced. The harmful effects caused by this can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a simplified front view of a coal storage silo discharging hopper to which the blockage elimination device of this invention is applied, Fig. 2 is an enlarged view of a flow detector, Fig. 3 is an end view of Fig. 2, and Fig. 4 The figure is an automatic control sequence diagram of the blockage resolving device, and FIGS. 5 and 6 are front views showing simplified embodiments of the second and third embodiments.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A level detector 3 and a breaker 4 are installed on the outer surface of the coal storage silo discharge hopper 1; (b) A vibrating feeder 8 is installed on the lower surface of the feed shooter 6 that follows the hopper outlet 7; (c) The above. A flow detector 9 is installed to detect the presence or absence of the delivered coal 2 on the vibrating feeder 8, and the flow detector 9 detects that there is no delivered coal 2, and the level detector 3 detects the presence or absence of the delivered coal 2 in the hopper 1.
The coal storage silo discharging hopper is characterized in that it constitutes an electric control system that detects the presence of the breaker 4 and automatically operates the breaker 4 only when the conditions for the vibration feeder 8 to operate are met. deocclusion device.