JPH0468004B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides negative pressure in a closed storage container connected to a material supply source by an air intake source connected to the closed storage container through a filter. The present invention relates to a filter cleaning device in a powder supply device designed to suck powder or granule material from a material supply source into a closed storage container.

(Prior art) As filter cleaning devices for this type of powder supply device, there are conventionally known filter cleaning devices that apply mechanical vibration to the filter, devices that use a scraping operation, and devices that utilize reverse airflow. ing.

Among these, the reverse airflow method has a simpler structure than other mechanical vibration methods and scraping methods, and is very effective with fewer failures.

(Problem to be solved by the invention) However, even when this reverse airflow method is adopted, a dedicated energy source for generating the reverse airflow is required.
If it is prepared separately as in the past, not only will it not contribute much to simplifying the configuration, but it will also considerably increase the cost required for the device and its operation, which is disadvantageous in that the advantages of the reverse airflow method will be greatly diminished. has.

The present invention has been made in order to solve the above-mentioned problems in the prior art, and provides a filter cleaning device that can be constructed simply and at low cost in a powder supply device that utilizes negative pressure. This is the purpose.

(Means for Solving the Problems) The filter cleaning device of the present invention has an airtight storage container that communicates with a material supply source via a material supply pipe, and communicates with this airtight storage container via an intake pipe and a filter. In a powder supply device that is designed to apply negative pressure from an intake source to suck powder or granular material from a material supply source into a closed storage container, a negative pressure responsive type is provided at a portion of the intake pipe closer to the intake source than the filter mounting position. A cleaning valve for introducing outside air consisting of an air-operated valve is provided, and the pilot air introduction part of this cleaning valve and the sealed storage container are communicated via a pilot signal transmission pipe, and the pilot signal transmission pipe and the material supply pipe are connected to each other through a pilot signal transmission pipe. A cut valve is provided in the middle of each of the intake pipes to open and close these pipes, and after creating a negative pressure in the sealed storage container by the intake air source, the cut valve of the intake pipe is closed and the cut valve of the pilot signal transmission pipe is opened. By applying the negative pressure of the sealed storage container to the pilot air introduction part of the cleaning valve, the cleaning valve is opened and outside air is introduced into the intake pipe. It is characterized by being designed to wash.

Example 1 A first example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a schematic configuration of a suction (negative pressure) transportation type powder supply device to which the filter cleaning device of the present invention is applied, and is a material supply source for flexible containers, hoppers, bagging, etc. Supply container 1
The closed storage container 2 for storage which sucks and receives the powder material from the material supply container 1 is in communication via a material supply pipe 3.

On the other hand, an air intake source 4 consisting of a vacuum pump or a blower and the airtight storage container 2 are in communication via an air intake pipe 5, and a filter 6 is provided at the terminal end of the air intake pipe 5, which opens into the upper part of the airtight storage container 2. is installed. In addition, in the middle of the intake pipe 5, that is, the part closer to the intake source 4 than the filter mounting position,
A cleaning valve 7 for introducing outside air is installed which opens the intake pipe 5 to the outside air side when opened, and this cleaning valve 7 has the structure shown in FIG. 2 and opens in response to negative pressure pilot air. Consists of an air-operated valve. In FIG. 2, the interior of the valve body of the cleaning valve 7 is divided into two by a diaphragm 8 into a lower half where an inlet 9 and an outlet 10 are formed, and an upper half where a pilot air introduction part 11 is opened. The diaphragm 8 is biased by the spring 12 to open the outlet 10.
The diaphragm 8 is pressed against a valve seat 10a formed on the side so that the diaphragm 8 always blocks the gap between the inlet 9 and the outlet 10. Also, the entrance 9 of the diaphragm chamber 13 in the upper half where the diaphragm 8 is closed.
The diaphragm chamber 13 and the diaphragm chamber 13 communicate with each other through a bleed hole (not shown), so that the pressure in the diaphragm chamber 13 is always the same as that in the inlet 9. The outlet 10 of the cleaning valve 7 communicates with the intake pipe 5, while the inlet 9 is open to the outside air.

Further, the sealed storage container 2 and the bottom where the discharge port 14 is formed are communicated with the pilot air introduction part 11 of the cleaning valve 7 via a pilot signal transmission pipe 15. A cut valve 16 is interposed in the middle of the pipe to open and close the pipe.

Furthermore, cut valves 17 and 18 are interposed in the portion of the intake pipe 5 from the cleaning valve 7 mounting position to the intake source 4 and in the middle of the material supply pipe 3, respectively, for opening and closing these pipes. .

Note that a suction nozzle 19 is connected to the starting end side of the material supply pipe 3. A secondary air intake pipe (not shown) for taking in secondary air into the material supply pipe 3 is provided at a suitable location of this suction nozzle 19, and a solenoid valve is interposed in the middle of this secondary air intake pipe. By intermittently opening and closing (not shown), it is possible to transport the plug and at the same time prevent the inside of the material supply pipe 3 from being clogged with powder material. In addition, an auxiliary intake part (not shown) for secondary air is separately provided at a suitable location in the middle of the material supply pipe 3, and when the inside of the material supply pipe 3 is clogged with powder or granular material, the secondary air is taken in from the auxiliary intake part. It is also possible to use secondary air to loosen the blockage material. In short, any supply means such as the material supply pipe 3 for transporting the material from the material supply container 1 to the closed storage container 2 may be used. 20 is a pressure gauge provided in the middle of the intake pipe 5, and 21 is an upper limit level gauge that indicates the upper limit level of storage of the granular material in the closed storage container 2.

In the powder supply device having the above configuration, the powder material is supplied from the material supply container 1 to the closed storage container 2 while opening the cut valves 17 and 18 of the intake pipe 5 and the material supply pipe 3, respectively. This is carried out with the cut valve 22 of the outlet 14 at the bottom of the container 2 and the cut valve 16 of the pilot signal transmission pipe 15 closed. As a result, the air intake source 4 and the sealed storage container 2 communicate with each other via the intake pipe 5,
The closed storage container 2 and the material supply container 1 are also communicated via the material supply pipe 3, and the inside of the closed storage container 2 becomes negative pressure due to the suction action of the suction source 4, and the material supply container 1
The granular material is suctioned and stored in the sealed storage container 2 through the material supply pipe 3. At this time, as described above, since the pilot signal transmission pipe 15 is closed midway by the cut valve 16, the negative pressure inside the closed storage container 2 is not detected by the cleaning valve 7. That is, in the cleaning valve 7, the internal pressure of the diaphragm chamber 13, which communicates with the inlet 9 that is open to the outside air side through a bleed hole (not shown), is equal to the outside air pressure, and the diaphragm 8 is pushed by the spring 12 and the inlet 9 and the outlet 10, and outside air is not introduced into the intake pipe 5 through this cleaning valve 7. Further, since the terminal end of the intake pipe 5 is open into the closed storage container 2 through the filter 6, further intrusion of the granular material fed into the closed storage container 2 into the intake pipe 5 is prevented. Ru.

As a result of the above-described material supply operation, powdery material adheres to the filter 6, resulting in a decrease in the efficiency of intake air transport. The filter cleaning process for removing the particulate material adhering to the filter 6 is performed by the following operation.

The cut valve 22 of the outlet 14 at the bottom of the closed storage container 2 and the cut valve 16 of the pilot signal transmission pipe 15 are closed, and the cut valve 17 of the intake pipe 5 is closed.
The cut valve 18 of the material supply pipe 3 is closed while keeping it in the open state at the time of material supply. When the suction source 4 is driven in this state, the inside of the closed storage container 2 is subjected to negative pressure due to its suction action.

When a predetermined period of time has elapsed from the start of the suction operation, a timer (not shown) operates to close the cut valve 17 of the intake pipe 5 and simultaneously open the cut valve 16 of the pilot signal transmission pipe 15. As a result, the diaphragm chamber 13 of the cleaning valve 7 and the inside of the sealed storage container 2 communicate with each other via the pilot signal transmission pipe 15, and the diaphragm chamber 13 becomes a negative pressure, and the diaphragm 8 is moved to the spring 12 by the pressure difference with the outside air pressure on the inlet 9 side. is pushed up against the urging force of
An inlet 9 that opens to the outside air side and an outlet 10 that opens to the intake pipe 5 side communicate with each other. Accordingly, due to the pressure difference between the outside air and the inside of the closed storage container 2, the cleaning valve 7 flows into the inside of the closed storage container 2 through the filter 6, and the filter 6 is cleaned by the reverse airflow of this outside air.

In the filter cleaning operation described above, the diaphragm chamber 13 of the cleaning valve 7 communicates with the inside of the sealed storage container 2 and the pressure is changed to negative pressure as described above. Therefore, the above-mentioned filter cleaning is performed not only when the powdery material is discharged from the sealed storage container 2, but also when the powdered and granular material remains in the sealed storage container 2. It can be done.

In addition, each of the cut valves 16, 17, 18, 2
The opening and closing of 2 is remotely controlled by air control or electric control.

Example 2 A second example of the present invention will be described below with reference to FIGS. 3 and 4.

In this embodiment, a pneumatic transport device 26 is provided on the outlet 14 side of a closed storage container 2 that stores the powdered material sent from the material supply container 1 to transport the stored powdered material to another location. This embodiment is applied to a powder/granular material supplying apparatus formed by connecting the above, and the same components as in the first embodiment are designated by the same reference numerals.

The pneumatic transport device 26 is a transport pipe 2 that connects the closed storage container 2, a mixer 27 provided on the bottom outlet 14 side, a hopper 28 serving as a material collection section, etc.
9. Air power source 3 that supplies pressurized gas such as air or argon to the transport pipe 29 via the gas supply pipe 30
1 etc. The transport pipe 29 is configured to be able to separately supply pressurized gas from an air source 31 to appropriate locations through auxiliary gas supply pipes 32, thereby increasing the transport pressure of the transport pipe 29 and reducing the amount of powder inside the pipe. It is designed to prevent occlusion of body material.

Further, as shown in an enlarged view in FIG. 4, the mixer 27 is connected to a branch pipe 33 branching from the gas supply pipe 30 at the side wall portion, and the pressurized gas supplied from the branch pipe 33 is connected to the mixer 27. It is configured to intermittently and sequentially feed the granular material in the closed storage container 2 into the transport pipe 29 in fixed quantities. The end of the pilot signal transmission pipe 15 on the side of the sealed storage container 2 which transmits the internal pressure of the sealed storage container 2 to the diaphragm chamber 13 of the cleaning valve 7 is connected to the mixer 2.
It is configured to communicate with the inside of the sealed storage container 2 through the side wall portion of the container 7.

In the powder supply device of this embodiment, in order to block the discharge port 14 side of the closed storage container 2 when the inside of the closed storage container 2 is made to have a negative pressure during the filter cleaning operation, a pipe is provided in the middle of the transport pipe 29. Cut valve 34, cut valve 3 of gas supply pipe 30
5. Close the cut valve 36 of the auxiliary gas supply pipe 32, etc.

Other filter cleaning operations are the same as those in the previous embodiment.

In this embodiment, a secondary air intake pipe 23 for taking in secondary air into the material supply pipe 3 is provided at a suitable location of the suction nozzle 19, and an electromagnetic air intake pipe 23 interposed in the middle of this secondary air intake pipe 23 is provided at a suitable location of the suction nozzle 19. Although the valve 24 is driven to open and close intermittently to transport the plug and at the same time prevent the inside of the material supply pipe 3 from being clogged with powder or granules, such a configuration should not be adopted. It can also be done optionally. Further, an auxiliary pressurized air intake section 25 is separately provided in the middle of the material supply pipe 3, and pressurized gas from the auxiliary intake section 25 is used to loosen blockages of powder and granules in the material supply pipe 3. However, it can also be implemented without such a configuration.

Further, although the pneumatic transport device 26 of this embodiment employs a method of pumping gas, a suction type pneumatic transport device may also be implemented.

In each embodiment, a pressure-resistant container was used as the closed storage container 2, but any container may be used as long as it can withstand the pressure generated inside the container. In addition, as the cleaning valve 7, the one having the structure shown in the second figure is shown,
It is not limited to this, and the design can be changed as appropriate.

(Effects of the Invention) As described above, the filter cleaning device of the present invention provides a cleaning valve for introducing outside air, which is a negative pressure responsive air-operated valve, at a portion of the intake pipe closer to the intake pipe than the filter mounting position, and performs cleaning. The pilot air introduction part of the valve and the sealed storage container are communicated through a pilot signal transmission pipe, while the intake pipe, the material supply pipe, and the pilot signal transmission pipe communicating with the sealed storage container are opened and closed in the middle by a cut valve. Since the cut valve of the intake pipe is opened and the cut valves of the material supply pipe and the pilot signal transmission pipe are closed, the intake air source is driven to create a negative pressure in the sealed storage container, and then the cut valve of the intake pipe is closed. By opening the cut valve of the pilot signal transmission tube, outside air is introduced from the cleaning valve into the sealed storage container with negative pressure, and the filter can be cleaned with the reverse air flow of the outside air. The air intake source for material transportation can be used as an air source for filter cleaning without preparing a new source. Therefore, the configuration becomes simple, and the costs required for the configuration and operation of the device can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the cleaning valve, and FIG. 3 is a schematic diagram showing the configuration of the second embodiment of the present invention. FIG. 4 is a partially enlarged view showing the piping of the mixer section. 1... Material supply container (material supply source), 2... Sealed storage container, 3... Material supply pipe, 4... Air intake source,
5... Intake pipe, 6... Filter, 7... Cleaning valve, 8... Diaphragm, 9... Inlet,
10...Exit, 11...Pilot air introduction part,
12...Spring, 13...Diaphragm chamber,
14...Exhaust port, 15...Pilot signal transmission pipe, 16, 17, 18, 22, 34, 35, 36
...cut valve, 27...mixer.

Claims (1)

[Claims] 1. The inside of the closed storage container that communicates with the material supply source via the material supply pipe is made negative pressure by the intake source that communicates with this closed storage container via the intake pipe and the filter, and the powder and granular material of the material supply source is In a powder supply device intended to be sucked into a closed storage container, a cleaning valve for introducing outside air consisting of a negative pressure responsive air-operated valve is provided in a portion of the intake pipe closer to the intake source than the filter mounting position, and this cleaning valve is provided. communicating the pilot air introduction part of the valve and the sealed storage container via a pilot signal transmission pipe;
A filter cleaning device for a powder supply device, characterized in that a cut valve for opening and closing the pilot signal transmission pipe, the material supply pipe, and the intake pipe is provided in the middle of each of these pipes.