JP4893993B2 - Pressurized tank, apparatus for feeding powder into transport pipe, and method for feeding the same - Google Patents

Description

The present invention uses a pressurized tank used in a device that intermittently feeds a predetermined amount of powder into the transport pipe when the powder is plug-transported via compressed air using a transport pipe, and this pressurized tank is used. The present invention relates to an apparatus for feeding powder into a transport pipe and a method for feeding the same.

Conventionally, as one of this type of equipment, a pressure vessel equipped with a first pressure gauge, which is equipped with a metering cutter rotated by a motor at the lower end and a receiving opening with a damper at the top, can be weighed via a load cell. An auxiliary tank with a second pressure gauge with a discharge port at the bottom and a supply port with a damper at the top is provided above the pressure vessel, and the load cell and the damper are measured and calculated. Electrically connected via a controller, communicating the inlet of the pressure vessel and the outlet of the replenishing tank via a telescopic tube and a damper, and piping between the upper portion of the pressure vessel and the upper portion of the replenishing tank; Communicating via two on-off valves and communicating an exhaust pipe with an exhaust valve between two on-off valves in the pipe, and comparing and controlling the measured pressure values of the first pressure gauge and the second pressure gauge Enables electrical connection There are things you have.
JP-A-10-35886

However, the conventional powder feeding apparatus configured as described above has problems such as a complicated structure and a large-scale expensive device.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a pressurized tank having a simple structure for intermittently feeding powder into a transport pipe, an apparatus using the pressurized tank, and feeding the same. It is to provide a method.

In order to achieve the above object, a device for intermittently feeding a predetermined amount of powder into the transport pipe when plug transporting the powder via compressed air using a transport pipe, comprising a pressure vessel structure The tank body has an inlet on the upper wall and an outlet on the lower wall, and is disposed vertically below the inlet of the tank body and is moved up and down by compressed air to close the inlet. A first check valve that can be moved, and a second check valve that is disposed directly below the discharge port of the tank body and that can move up and down by compressed air and closes the discharge port. A pressure tank, a hopper that stores powder to be transported and has a powder discharge port at a lower end facing the input port of the tank body, and the powder discharge port of the hopper and the input port of the tank body are connected in communication Chute means and one end under the tank body A valve box having an outer surface surrounding the discharge port of the tank body and hermetically mounted and having the other end connected to the proximal end of the transport pipe, and a lower surface of the first check valve and a compressed air source. A first electromagnetic on-off valve connected / interrupted via the first conduit, and a second electromagnetic on-off valve connected / interrupted between the lower surface of the second check valve and the compressed air source via the second conduit; A third electromagnetic on-off valve capable of discharging compressed air in the first conduit, a detecting means for detecting the presence or absence of powder in the tank body, and a plurality of timers based on the detection result of the detecting means. Control means for controlling the first to third electromagnetic on-off valves so as to open and close in conjunction with each other.

In such a configuration, when the detection means detects "no powder", the first electromagnetic on-off valve is closed and then the third electromagnetic on-off valve is opened to discharge the compressed air in the tank body, The first check valve is lowered by its own weight and the inlet is opened. Along with this, the powder in the hopper slides down by its own weight and flows into the tank body. Further, the second electromagnetic on-off valve is opened, compressed air is supplied into the second check valve and the valve box, the second check valve is raised, and the discharge port is closed.

Thus, after the detection means detects “powder is present” due to the inflow of powder into the tank body and the required time elapses due to the operation of a plurality of timers, the third electromagnetic on-off valve is closed. 1 The electromagnetic on-off valve is opened, and while the powder continues to flow into the tank body, compressed air is supplied to the first check valve and the tank body, and the first check valve rises to close the inlet. And the inside of the tank body is pressurized. Then, due to the pressurization in the tank body, the second check valve is pushed down to open the discharge port, and the powder in the tank body is sent into the transport pipe. The powder fed into the transport pipe is plug-transported to a powder storage tank.

As is clear from the above description, claim 1 is a pressurization used for a device that intermittently feeds a predetermined amount of powder into the transport pipe when transporting the powder through a compressed pipe using a transport pipe. A tank having a pressure vessel structure, having an inlet on the upper wall and an outlet on the lower wall, arranged vertically below the inlet and raised by compressed air, A first check valve capable of closing the charging port; and a second check valve which is disposed directly below the discharge port so as to be movable up and down and can be raised by compressed air to close the charging port. Therefore, the present invention has excellent practical effects such as a simple structure, a small size and a low price as compared with a conventional device of this type.

Hereinafter, an apparatus for feeding powder into a transport pipe to which the present invention is applied will be described in detail with reference to FIG. When the powder is plug-transported through the compressed air using the transport pipe 7, the pressurized tank 6 used in a device for intermittently feeding a predetermined amount of powder into the transport pipe 7 has a pressure vessel structure. A tank body 6a having an inlet 3 on the upper wall and an outlet 4 on the lower wall, and is arranged to be movable up and down directly below the inlet 3 and can be closed by raising by compressed air. A first check valve 9 and a second check valve 10 which is arranged directly below the discharge port 4 so as to be movable up and down and can be raised by compressed air to close the discharge port 4. is there.

The apparatus for feeding the powder into the transport pipe includes the pressurized tank 6, a hopper 1 that stores powder to be transported and has a powder discharge port facing the input port 3 at the lower end, Chute means 5 for communicating and connecting the powder discharge port of the hopper 1 and the input port 3 of the tank body 6a, one end surrounds the discharge port 4 of the tank body 6a on the lower outer surface of the tank body 6a and is airtight. Connected / blocked between the valve box 8 mounted at the other end and connected to the base end of the transport pipe 7 and the lower surface of the first check valve 9 and the compressed air source 11 via the first conduit 12. The first electromagnetic on-off valve 13, the second electromagnetic on-off valve 15 for connecting / disconnecting the lower surface of the second check valve 10 and the compressed air source 11 via the second conduit 14, and the first The presence or absence of powder in the third electromagnetic opening / closing valve 16 capable of discharging the compressed air in the conduit 12 and the tank body 6a. Based on the detection result of the level meter 17 as a detection means to detect, the first to third electromagnetic on-off valves 13, 15, 16 are opened and closed in conjunction with each other via a plurality of timers. And control means 18 for controlling them.

The first and second check valves 9 and 10 have a structure in which a part of the supplied compressed air flows out to the outside. The third electromagnetic opening / closing valve 16 is connected to a duct 21 that is connected to a dust collector. The inside of the chute means 5 is connected to the upper part of the hopper 1 through a conduit 22 so that the inside of the chute means 5 and the upper part of the hopper 1 have the same pressure. The tip of the transport pipe 7 is connected to the powder storage tank 23. In the figure, reference numeral 26 denotes a flow rate adjusting valve.

As shown in the figure, when the level meter 17 detects “no powder”, the first electromagnetic on-off valve 13 is closed and the third electromagnetic on-off valve 16 is opened to open the tank body 6a. The inside of the tank body 6a is decompressed, the first check valve 9 is lowered by its own weight, and the inlet 3 is opened. Along with this, the powder in the hopper 1 falls down by its own weight, passes through the chute means 5 and then flows into the tank body 6a. During this time, the second electromagnetic on-off valve 15 is opened and compressed air is supplied into the second check valve 10 and the valve box 8, whereby the second check valve 10 is raised and the discharge port 4 is closed. In addition, the existing powder in the transport pipe 7 is plug-transported by compressed air.

In this way, after the level meter 17 detects “powder is present” due to the powder flowing into the tank body 6a, the third electromagnetic opening / closing valve 16 is closed when the plurality of timers operate and the required time has elapsed. After that, the first electromagnetic on-off valve 13 is opened, whereby the compressed air is supplied to the first check valve 9 and the tank body 6a while the flow of powder into the tank body 6a is continued. The first check valve 9 is raised to close the inlet 3 and pressurize the tank body 6a. The second check valve 10 is pushed down by the pressurization in the tank body 6 a and the weight of the second check valve 10 to open the discharge port 4, and the powder in the tank body 6 a is sent into the transport pipe 7. It is. The powder fed into the transport pipe 7 is plug-transported to the powder storage tank 23. Further, when the feeding of the powder in the tank body 6a into the transport pipe 7 is completed, the level meter 17 detects “no powder”, and then the above-described operation is repeated.

In the above embodiment, the powder discharge port of the hopper 1 and the input port 3 of the tank body 6a are connected in communication via the chute means 5, but the powder is like sand or the like. If it does not scatter relatively, the chute means 5 may be omitted so that the powder discharge port of the hopper 1 directly faces the input port 3 of the tank body 6a.

It is a schematic diagram which shows the best form of this invention.

Explanation of symbols

1 Hopper
3 Inlet 4 Outlet 6 Pressurized tank
6a Tank body 9 First check valve 10 Second check valve 11 Compressed air source 12 First conduit 13 First electromagnetic on-off valve 14 Second conduit 15 Second electromagnetic on-off valve 16 Third electromagnetic on-off valve 17 Level meter 18 Control means

Claims (2)

A device that intermittently feeds a predetermined amount of powder into the transport pipe when transporting the powder through compressed air using a transport pipe,
The tank body has a pressure vessel structure, and has an inlet on the upper wall and an outlet on the lower wall, and is disposed vertically below the inlet of the tank body and can be moved up and down by compressed air. A first check valve capable of closing the charging port; a second check valve which is disposed directly below the discharge port of the tank body so as to be movable up and down and can be raised by compressed air to close the discharge port; A pressurized tank comprising:
A hopper for storing powder to be transported and having a powder outlet at the lower end facing the inlet of the tank body;
Chute means for connecting the powder discharge port of the hopper and the input port of the tank body in communication,
A valve box having one end enclosing the discharge port of the tank body on the lower outer surface of the tank body and hermetically mounted, and the other end communicating with the base end of the transport pipe;
A first electromagnetic on-off valve for connecting / blocking a lower surface of the first check valve and a compressed air source via a first conduit;
A second electromagnetic on-off valve that connects / cuts off the lower surface of the second check valve and the compressed air source via a second conduit;
A third electromagnetic on-off valve capable of discharging compressed air in the first conduit;
Detection means for detecting the presence or absence of powder in the tank body;
Based on the detection results of the detection means , control means for controlling the first to third electromagnetic on-off valves to open and close in conjunction with each other via a plurality of timers;
A device for feeding powder into a transport pipe, comprising: A method for intermittently feeding powder into the transport pipe using the powder feed apparatus according to claim 1 ,
By detecting "no powder" by the detection means, the first electromagnetic on-off valve is closed and then the third electromagnetic on-off valve is opened to discharge the compressed air in the tank body,
Lowering the first check valve by its own weight to open the inlet of the tank body, allowing the powder in the hopper to flow into the tank body,
Opening the second electromagnetic on-off valve to supply compressed air into the second check valve and the valve box, raising the second check valve and closing the discharge port of the tank body;
A plurality of timers are operated in sequence by detecting "powder is present" by the detecting means due to inflow of powder into the tank body, and then the first electromagnetic on-off valve is closed after the third electromagnetic on-off valve is closed. And the compressed air is supplied to the first check valve and the tank body while the inflow of the powder into the tank body is continued.
Raising the first check valve to close the inlet of the tank body and pressurizing the inside of the tank body to push down the second check valve to open the outlet, A method for feeding powder into a transport pipe, wherein the powder is fed into a transport pipe.