JPH0450258Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a conveying device used for pneumatically conveying powder, granules, and the like.

[Background of the idea]

There are two types of pneumatic conveyance: a pressure-feeding method and a suction method.The pressure-feeding method is a method in which air compressed by a compressor, etc. is sent from the sending side of the conveying path to the destination side, and powder and granules are forced from the sending side to the destination side. The suction method is a method in which a suction blower or the like is connected to the destination side to suck powder or granules from the sending side of the conveyance path to the destination side. However, in the pressure feeding method, the air is heated by compression, so the air suction method is used to transport non-heat resistant powders and granules that soften and stick together when heated, such as synthetic resin pellets. Adopted.

[Conventional technology]

In the conventional suction method, as shown in FIG. 2, a suction port 2, a suction path 3, and a communication path 4 communicating with a discharge chute 5 are connected to the tank 1, and a valve 6 is interposed in the suction path 3. An air inlet 7 with a valve 8 communicates with it, and an air suction blower 9 communicates with it, and a damper 10 is attached to the outlet of the communication path 4. Then, the valve 6 is opened, and the air suction blower 9 sucks powder or granules into the tank 1 from the suction port 2 through the suction path 3. When the tank 1 is full of powder or granules, the valve 6 is closed to stop the suction of powder or granules, open the valve 8 to introduce atmospheric pressure into the tank 1 from the atmosphere inlet 7 through the suction path 3, and open the damper 10 of the communication path 4 to stop the suction of powder or granules. The powder or granules in 1 are moved to the discharge chute 5, the damper 10 is closed again, the valve 6 is opened, the valve 8 is closed, and the air suction blower 9 blows the suction port 2 into the tank 1 via the suction path 3. Suction of powder or granules from.

[Problem that the invention attempts to solve]

With such conventional air suction methods, it is not possible to continuously suction and convey powder or granules.
Since this was done intermittently, the transfer efficiency was poor and valve operations were complicated. It is also possible to carry out the suction and conveyance continuously by arranging the tanks in parallel and alternately carrying out suction and conveyance, but in this case, a switching valve or the like is required, which complicates the structure and makes the valve operation even more complicated.

[Means for solving problems]

In the present invention, as a means to solve the above-mentioned problems, a plurality of tanks 11 and 12 are arranged one above the other, the plurality of tanks 11 and 12 are connected to each other by a communication path 16, and an exit of the communication path 16 is provided. A free damper 19 is pivotally mounted at the upper end of each of the tanks 11 and 12, and a powder or granule conveying device is connected to the plurality of tanks 11 and 12 with suction paths 15 and 17 connected to an air suction blower 28, respectively. This is what we provide.

[Effect]

Powder or granules are sucked into the uppermost tank 11 through a suction path 15 by an air suction blower 28 . At this time, the free damper 19 of the uppermost communication path 16 is sucked by the suction path 15 via the uppermost tank 11 and is in a closed state. When the top tank 11 is full of powder or granules, the second tank 12 is sucked by the air suction blower 28 through the suction path 17, and the top tank 11 and the second tank 12 are sucked. When the internal pressures of the two tanks become equal, the powder or granules in the top tank 11 pushes open the free damper 19 of the top connection path 16 due to its weight and moves into the second tank 12. Powder or granules are sucked into the upper tank 11. At this time, the free damper 20 of the second-stage communication path 18 is sucked by the suction path 17 via the uppermost tank 11 and the second-stage tank 12, and is in a closed state. When the second stage tank 12 is full of powder or granules, the suction through the suction path 17 of the second stage tank 12 is stopped, and when the atmosphere is introduced into the tank 12, the powder or granules in the tank 12 are removed. The weight pushes open the free damper 20 of the second-stage communication path 18 and moves into the third-stage tank 13. Alternatively, while continuing suction through the suction path 17 of the second-stage tank 12, the third-stage tank 13 is suctioned through the suction path to equalize the internal pressures of the second-stage tank 12 and the third-stage tank 13. Even so, the powder or granules in the second stage tank 12 push open the free damper 20 of the second stage communication path 18 due to its weight and move into the third stage tank 13. In this way, the uppermost tank 11 can be kept in a suction state at all times, and the powder or granules can be sequentially transferred to the lower tanks.

[Effect of idea]

Therefore, with the conveying device of the present invention, powder or granules can be conveyed continuously, and the free damper can be pushed open by the weight of the powder or granules when transferring from tank to tank. Since the damper opening/closing mechanism is completely unnecessary, the structure is extremely simple.

〔Example〕

The present invention will be explained with reference to an embodiment shown in FIG.
2 is a second tank, which is placed in the second stage; 13 is a discharge chute, which is placed in the third stage;
The suction port 14, the first suction path 15, and the inlet of the first communication path 16 communicate with the second tank 12.
an outlet of the first communication path 16, and an outlet of the second suction path 1.
7, and the inlet of the second communication path 18 communicate with each other, the outlet of the second communication path 18 communicates with the discharge chute 13, and the first communication path 16 and the second communication path 1 communicate with each other.
The upper ends of free dampers 19 and 20 are pivotally mounted to the outlets of 8, respectively. Further, filters 21 and 22 made of wire mesh are removably attached to the openings of the first suction path 15 and the second suction path 17 in the first tank 11 and the second tank 12, respectively. First suction path 15 and second suction path 17
are the first baggage filter 23, the second baggage filter 24, the first valve 25, and the second valve 26, respectively.
The main suction path 27 is connected to an air suction blower 28, and a second air suction blower 28 is connected to the main suction path 27.
An atmospheric air inlet 29 equipped with a third valve 30 communicates with the suction path 17 .

In the above configuration, first, the first valve 25 is opened, the second valve 26 and the third valve 30 are closed, and the air suction blower 28 is operated to pass from the suction port 14 to the first tank via the main suction path 27 and the first suction path 15. 1
The synthetic resin pellets are sucked into the container. In this case, the free damper 19 is sucked through the first tank 11 and is in a closed state. When the first tank 11 is full of synthetic resin pellets, the second valve 26 is opened and the air in the second tank 12 is sucked through the main suction path 27 and the second suction path 17, and the first tank 11 and When the pressure of the first tank 11 approaches the same as that of the second tank 12, the synthetic resin pellets in the first tank 11 push open the free damper 19 due to its weight and transfer to the second tank 12 via the first communication path 16. In this case, the free damper 20 is sucked through the second tank 12 and is in a closed state. At this time, the first valve 25 may be closed to stop suction of the air in the first tank 11. Whether the first valve 25 is left open or closed, the air in the second tank 12 is sucked through the second suction path 17, and since the free damper 19 is open, the first Suction into the tank 11 continues during this time as well. When the second tank 12 is full of synthetic resin pellets, close the second valve 26 to stop sucking the air in the second tank 12, and then open the third valve 30 to start the second suction from the air inlet 29. Atmospheric air is introduced into the second tank 12 via the path 17. When the pressure inside the second tank 12 approaches atmospheric pressure, the synthetic resin pellets in the second tank 12 are transferred to the discharge chute 13 due to their weight and are discharged. In this case, when the second valve 26 is closed, the second tank 12 closes the first valve 26 before introducing the atmosphere.
5 and suck the first tank 11. In this state, the free damper 19 is closed by suction, and the suction of the synthetic resin pellets from the suction port 14 into the first tank 11 continues. Note that the synthetic resin pellets are prevented from being sucked into the first suction path 15 and the second suction path 17 by the filters 21 and 22, and the fine powder adhering to the synthetic resin pellets passes through the filters 21 and 22 and is sucked into the first suction path 15 and the second suction path 17. The first bag filter 23 and the second bag filter 24 prevent the air from being sucked into the path 15 and the second suction path 17 and further into the air suction blower 28 via the main suction path 27 . Note that if there is no fine powder, the bag filter is not necessary.

As mentioned above, while the powder or granules are transferred from the first tank to the second tank or from the second tank to the discharge chute, the suction of the powder or granules to the first tank is not interrupted. It will be done.

Other than this embodiment, three or more tanks may be arranged.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. In the figure, 11...first tank, 12...second tank, 13...discharge chute, 14...suction port, 1
5...First suction path, 16...First communication path, 1
7...Second suction path, 18...Second communication path, 1
9, 20...Free damper, 25...First valve, 26...Second valve, 27...Main suction path,
28...Air suction blower, 29...Atmospheric inlet,
30...Third valve.

Claims (1)

[Scope of utility model registration request] A plurality of tanks are arranged one above the other, the plurality of tanks are connected to each other by a communication path, and a free damper is pivotally mounted at the upper end of each outlet of the communication path, and the plurality of tanks are connected to each other by a communication path. A conveying device for powder or granules, characterized in that each suction path is connected to an air suction blower.