JP2645723B2 - Prevention method of clogging of storage / discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention relates to a storage and discharge machine that discharges dust stored in a hopper by a transport pipe connected to a blower, and in particular, to a storage and discharge machine. The present invention relates to a method for preventing clogging of refuse in an ejector.

(2) Conventional technology Conventionally, in order to efficiently treat a large amount of dust discharged from a high-rise building, the dust is temporarily stored in a hopper installed in a basement or the like, and the dust is transferred through a transport pipe. Storage and discharge machines that discharge to garbage trucks are used. The storage / discharge machine supplies dust into a transport pipe by a screw feeder provided at a lower part of a hopper, and discharges the dust together with the air by sucking air in the transport pipe with a blower.

By the way, since the garbage processed by the above-mentioned storage and discharge machine is a mixture of substances of various shapes, there has been a problem that clogging often occurs in the storage and discharge machine and discharge becomes impossible. . For this reason, the screw feeder mounted in the storage and discharge machine is made rotatable in both forward and reverse directions, and when clogging of dust occurs, the screw feeder is reversed for a certain time to release clogging of dust, and then the screw feeder is again turned on. A method has been proposed in which the obstruction is eliminated by rotating it forward.

(3) Problems to be Solved by the Invention However, when the degree of blockage is remarkable, the blockage often cannot be resolved even by using the above-described method of reversing the screw feeder. In such a case, there is no other way but to remove the clogged dust manually by opening the lid of the load cell section located at the end of the screw feeder, and this work is extremely difficult due to the bad smell and dirt of the dust. Was something.

The present invention has been made in view of the above circumstances, and even when a storage / discharge machine is severely blocked, a storage / discharge machine capable of automatically eliminating the blockage without manual operation. A technical problem is to provide a method for preventing blockage.

B. Configuration of the Invention (1) Means for Solving the Problems In order to solve the above problems, the method for preventing blockage of a storage and discharge machine according to the first aspect is provided with a screw feeder provided below a hopper capable of storing dust. The trough is continuously connected, and a downwardly tapered portion is formed between the extrusion port of the trough and a transport pipe disposed below the trough and having a downstream end connected to the blower, and The lower end is connected through a connecting pipe equipped with an openable and closable plate valve, and upstream of the transport pipe, there is a 2 for assisting the transport of dust supplied from the inside of the hopper to the connecting pipe side by a screw feeder.
A method for preventing clogging of a storage / discharge machine provided with an on-off valve for introducing the next air, wherein the screw feeder and the blower are operated and the plate valve and the on-off valve are opened, and during the dust transportation performed by opening the on-off valve, the screw feeder and When the blocking state of the refuse occurs between the transport pipes and the pressure in the transport pipe drops below a predetermined value, the on-off valve is closed for a certain time while maintaining the open state of the plate valve and the operating state of the blower, and thereafter, The on-off valve is rapidly opened, and the closed state of the dust is eliminated by the impulsive airflow generated at that time.

The method for preventing blockage according to the second aspect is characterized in that the closing / opening operation of the on-off valve in the method according to the first aspect is performed continuously until the blockage of the dust is eliminated. The closing / opening operation of the on-off valve in the method of item 1
A warning is issued and the operation is stopped when the clogging of the refuse is not resolved even after the repetition of the number of times, and the method for preventing clogging according to the fourth item is the method according to the first, second or third item, wherein The operation speed of the screw feeder is controlled to increase or decrease according to the pressure.

(2) Operation During the above-mentioned dust transport, dust is likely to be clogged between the screw feeder and the transport pipe, particularly in the plate valve located at the lower end of the connecting pipe which is tapered downward and in the connecting pipe immediately above the valve. If the blockage occurs,
Until then, only the intake air sucked from both the plate valve and the on-off valve is sucked from the on-off valve, and the pressure in the transport pipe decreases. When this decrease in pressure is detected, the on-off valve is closed, and the pressure in the sealed transport tube is further reduced by the suction action of the blower. When the on-off valve is suddenly opened in this state, the atmosphere rapidly flows into the transport pipe, and the impacted air causes pressure fluctuations acting immediately below the plate valve to effectively eliminate the closed state of the dust.

Further, if the operation speed of the screw feeder is controlled to increase or decrease according to the pressure in the transport pipe, the screw feeder can be efficiently and smoothly operated according to the degree of clogging of dust on the upstream side of the transport pipe, that is, the load.

(3) Example Hereinafter, an example of a method for preventing blockage of a storage and discharge machine according to the present invention will be described with reference to the drawings.

FIG. 1 is a view showing the entire structure of the storage and discharge machine. As is apparent from FIG. 1, a hopper 3 for storing dust is provided at the upper ends of the columns 2a and 2a erected on the floor surface 1. Have been. The hopper 3 is a box-shaped container tapered downward, and a dust chute 4 for guiding dust discharged from an upper floor is connected to an upper opening 3a.
On the other hand, a biaxial screw feeder 6 is mounted inside a trough 5 installed horizontally in a lower portion of the hopper 3, and supports a support plate 7 on columns 2b, 2b standing upright on the floor surface 1. The driving force of the attached motor 8 is transmitted through a speed reducer 9 to rotate the screw feeder 6 in both forward and reverse directions.

The extrusion port 5a of the trough 5 and the screw feeder 6
A connecting pipe 11 extending vertically extends between the transport pipe 10 disposed below and along the floor 1. The connecting pipe 11 is formed so as to be tapered downward, and a plate valve 13 driven to be opened and closed by a cylinder 12 is mounted at an end, that is, a lower end thereof. A blower 14 for generating an air flow for sucking dust supplied by the screw feeder 6 is connected to a downstream side of the transport pipe 10, and a secondary blower for assisting the transport of dust is provided at an upstream end thereof. An on-off valve for introducing air, that is, a butterfly valve 15 is mounted to be openable and closable by a cylinder 16.

In addition, a level meter 17 that detects an empty state of the hopper 3 using electromagnetic waves is installed near the extrusion port 5a of the trough 5, and further downstream of the plate valve 13 of the transport pipe 10, A pressure gauge 18 for detecting a closed state of the garbage is provided.

Next, the operation of the embodiment of the method for preventing blockage of the storage / discharge machine according to the present invention having the above-described configuration will be described with reference to the flowchart of FIG.

Subsequent to the start of the terminal 19, the butterfly valve 15 is half-opened in a process 20, the blade valve 13 is fully opened in a process 21, and the screw feeder 6 is normally rotated in a process 22. Then, the dust in the hopper 3 is transported along the trough 5 by the screw feeder 6, extruded into the connecting pipe 11 from the extrusion port 5 a, and further supplied to the transport pipe 10 through the plate valve 13. The garbage supplied in the transport pipe 10 in this manner is
The air is transferred together with the secondary air introduced by the blower 14 from the butterfly valve 15 in a half-open state, and is discharged to the outside. During the operation as described above, the presence or absence of dust in the tram 5 is constantly monitored by the level meter 17, and when the hopper 3 becomes empty and the level meter 17 is turned on, that is, the judgment 23
If the answer is YES in step 24, the screw feeder 6 is stopped in step 24, the plate valve 13 is closed in step 25, the butterfly valve 15 is opened in step 26, and the terminal 27 is terminated.

On the other hand, if the dust still remains in the hopper 3, that is, if the determination is NO in decision 23, the pressure detected by the pressure gauge 18 installed on the transport pipe 10; P (mm water column) is referred to in decision 28, and based on the result, Thus, the screw feeder 6 and the butterfly valve 15 are controlled.

That is, if P> −100, the load is light, and therefore the processing 29
, The speed of the screw feeder 6 is increased, and the amount of refuse supplied to the transport pipe 10 is increased. When the value of P is an appropriate value of −100 ≧ P ≧ −300, the operation of the screw feeder 6 is continued in the process 30 without any change. Further, when P <−300, since the load is heavy,
In decision 31, a comparison is made with reference pressure P = -500. If -300>P> -500, the screw feeder 6 is decelerated in the process 32, and the dust transport pipe 10
Supply to the plant is reduced. On the other hand, if P ≦ −500, it is determined that the blockage has occurred, and in the process 33, the screw feeder 6 is reversed for 10 seconds. As a result, the comparison with the reference pressure P = −500 is performed again in the judgment 34, and P>
If it has returned to -500, it is determined that the blockage has been resolved, and in process 35, the screw feeder 6 is returned to normal rotation again. On the other hand, if P ≦ −500, it is determined that the blockage has not yet been resolved, and the blockage prevention method according to the present invention is executed.

That is, it is determined whether or not the number of executions n described later is 3 in a judgment 36. If NO, the butterfly valve 15 is closed in a process 37 and the transport pipe is suctioned by the suction force of the blower 14.
Further reduce the pressure in 10. Then, when it is confirmed in judgment 38 that 10 seconds have elapsed, in process 39, the butterfly valve 15 is suddenly fully opened. Then, the atmosphere is a low pressure transport pipe
The dust that flows into the interior of the shock absorber 10 and is generated by the shocking air flow in the portion immediately below the plate valve 13 effectively removes dust that blocks the plate valve 13 and the connection pipe 11 immediately above the plate valve 13. . When it is confirmed in judgment 40 that 10 seconds have elapsed after the opening of the butterfly valve 15, the butterfly valve 15 is returned to the normal half-open state in processing 41, and 1 is added to the number of executions n in processing 42 to obtain n + 1 And then the above-mentioned judgment 34
The following is repeated again.

At this time, if P> -500 in the judgment 34, the blockage has been eliminated by the first execution, and the processing 35
Proceed to. However, if P ≦ −500 in the determination 34, it means that the blockage has not yet been resolved, and the opening / closing operation of the butterfly valve 15 after the processing 37 is repeated again with the number of executions n = 2. Then, after the second execution is completed, if P ≦ −500 again in decision 34, n = 3 in decision 36.
Becomes YES, it is determined that the blockage cannot be resolved, and the processing 45
, The alarm buzzer is activated, the device is stopped in process 46, and the terminal 45 is ended.

An auxiliary butterfly valve 15 'for introducing secondary air into the transport pipe 10 as shown by a chain line in FIG.
It may be provided on the upper part of 11.

Although the embodiment of the method for preventing blockage of the storage / discharge machine according to the present invention has been described in detail, the present invention is not limited to the above-described embodiment, and various small design changes can be made.

For example, the reverse operation of the screw feeder performed at the time of closing is not always necessary, and the opening and closing operation of the butterfly valve may be directly performed. In addition, the number of times the butterfly valve is opened and closed when the blockage is not resolved is not limited to two, and can be set appropriately. Another equivalent valve may be used in place of the butterfly valve.

C. Effects of the Invention According to the method for preventing blockage of the storage and discharge machine of the present invention described above,
Activate the screw feeder and the boar and open the plate valve and open / close valve, and during the garbage transportation, at the part where the garbage is likely to be blocked between the screw feeder and the transport pipe, for example, at the lower end of the connecting pipe that is tapered downward. Even if a blocked state of dust occurs in the located plate valve and the connection pipe immediately above the valve, the open state of the plate valve and the above-described state are determined in accordance with the pressure in the transport pipe being reduced to a predetermined value or less due to the blocked dust. After the on-off valve is closed for a certain period of time while the blower is operating, the on-off valve is suddenly opened. The pressure fluctuation acting on the garbage can effectively eliminate the clogging state of the dust, thereby eliminating the problem by the conventional method of reversing the screw feeder. Severe blockage that could not Rukoto becomes possible to effectively eliminate, it is not necessary to perform the work remove the dust by the difficult hand.

In addition, since the on-off valve for introducing secondary air used for normal garbage transportation into the transportation pipe can be used as it is as the means for generating a shocking air flow for eliminating the garbage clogging, it is only that much. The structure is simplified, which can contribute to cost reduction.

[Brief description of the drawings]

FIG. 1 is an overall view of one embodiment of a method for preventing a storage / discharge machine from being blocked according to the present invention, and FIG. 2 is a flowchart for explaining the operation thereof. 3 ... hopper, 5 ... trough, 5a ... outlet, 6 ...
Screw feeder, 10… Transport pipe, 11… Connection pipe,
13 ... Plate valve, 14 ... Blower, 15 ... On / off valve (Balley fly valve)

Continuation of the front page (56) References JP-A-53-111671 (JP, A) JP-A-59-230901 (JP, A) JP-A-61-114903 (JP, A) JP-A-61-140401 (JP) , A) JP-A-52-137167 (JP, A) JP-A-52-86276 (JP, A) Fully open Sho. 59-173605 (JP, U) Really open Sho. 61-206503 (JP, U) Really open 61-49706 (JP, U) Japanese Utility Model Showa 60-16407 (JP, U) Japanese Utility Model Showa 60-100304 (JP, U) Japanese Patent Publication No. 57-61475 (JP, B2)

Claims (4)

(57) [Claims] 1. A trough (5) containing a screw feeder (6) is continuously connected to a lower portion of a hopper (3) capable of storing garbage, and an extrusion port (5a) of the trough (5) is provided.
A lower end is formed between the transport pipe (10) which is disposed below the trough (5) and has a downstream end connected to the blower (14), and can be opened and closed at the lower end. The connection is made via a connection pipe (11) equipped with a plate valve (13), and on the upstream side of the transport pipe (10) from the inside of the hopper (3) by a screw feeder (6) to the connection pipe (11) side. A method for preventing clogging of a storage / discharge machine provided with an on-off valve (15) for introducing secondary air for assisting transportation of refuse supplied to a screw feeder (6) and a blower (14). Actuated and said plate valve (13) and on-off valve (15)
When the dust is clogged between the screw feeder (6) and the transport pipe (10) during the dust transport performed by opening the plate, and the pressure in the transport pipe (10) drops below a predetermined value, the plate valve ( The on-off valve (15) is closed for a certain period of time while maintaining the open state of 13) and the operation state of the blower (14), and then the on-off valve (15) is rapidly opened, which occurs at that time. A method for preventing blockage of a storage / discharge machine, wherein the blockage state of the refuse is eliminated by an impulsive air flow. 2. The method according to claim 1, wherein the closing and opening operations of the on-off valve (15) are continuously performed until the clogging of the dust is eliminated. 3. The method according to claim 2, wherein, if the closing of the on-off valve (15) is not repeated even if the closing / opening operation of the on-off valve (15) is repeated twice, an alarm is issued and the operation is stopped. How to prevent clogging of storage and discharge machine. 4. The storage and discharge machine according to claim 1, wherein the operation speed of the screw feeder (6) is controlled to increase or decrease according to the pressure in the transport pipe (10). Blockage prevention method.