JPH085548B2 - High-pressure transportation equipment for powders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a high-pressure transportation for powders and granules, which enables stable transportation of various powders and granules without stagnation (blockage of the pipeline) on the way. Regarding the device.

[Conventional technology]

As a means to prevent the occurrence of blockage in the transportation pipe, an air pipe with compressed air jetting holes formed at regular intervals inside the transportation pipe or an air pipe for compressed air outside the transportation pipe is used. A device that is constructed by arranging the pipes side by side and ejecting compressed air from the pipes through the valve into the transportation pipe (air blow), or the flow proposed by the applicant in Japanese Patent Application Nos. 59-200859 and 61-21883. There are various types of devices called stabilizers. Incidentally, FIG. 4 is a diagram showing the relationship between the air volume Q and the pressure Ps when the above-mentioned air blowing is carried out to stably transport the powder and granules, and FIG. 5 is a block diagram without air blowing. It is a diagram of the state where it did.

[Problems to be solved by the invention]

In all of the above devices, compressed air is jetted inside the transportation pipe, and the jetted compressed air floats the powder and granules to stabilize its flow, thereby preventing the occurrence of blockage in the transportation pipe. To do.

In this way, a high-pressure transportation device equipped with an obstruction prevention device can move a granular material (transported material) at a predetermined pressure and speed (for example, a pressure of 4 kg / cm to 6 kg / cm and a high speed of 10 m / sec or more). ) Can be transported stably, but when the granules are granules or granules that do not want to be crushed like foods, or when they are granules that do not like to be worn like minerals. In particular, it is desirable that the transportation speed is low such as 1 to 5 m / sec.

However, when transported at such a low speed, when the transported material is a granular material having a large wall friction coefficient, or when it is a granular material that is wet and has high adhesiveness and poor air permeability, ,
No matter how much the above-mentioned various blocking occurrence preventing means are taken, there is a problem that the transported material adheres in the transportation pipe and blocks the transportation pipe.

Therefore, the technical problem of the present invention is to stably transport at a low speed without blocking the pipeline even if the granular material has a large wall friction coefficient or is wet and has high adhesiveness and poor air permeability. It is in.

[Means for solving problems]

Means taken in the present invention to solve the above technical problems are as follows.

(1) Closed when the transport pressure reaches a set value in the middle of each of the blow pipes containing the granular material and each of the supply pipes for supplying pressurized gas for transportation to the transport pipe for transporting the granular material. Install an on-off valve.

(2) An on-off valve that continuously opens when the transport pressure reaches a set value is provided in the middle of the pipe that supplies pressurized gas to the air knife attached to the root end side portion of the transport pipe.

However, here, the air knife is an air jet that separates the granular material in the transport pipe into a plug shape of approximately 0.5 to 1.5 m by jetting pressurized gas (compressed air) into the transport pipe. Means a device.

[Action]

 The above means operate as follows.

The element of (1) above catches in advance the clogging (clogging) tendency of the powder or granular material in the transportation pipe, and when the transportation pressure reaches the set value (upper limit value) due to the progress of clogging, the blow pot and the transportation pipe Since the supply of the pressurized gas to the is stopped and the transportation is stopped, the granular material being transported does not cause clogging in the transportation pipe.

The element of the above (2) carries out the air blow inside the transportation pipe which has stopped the transportation, transports the stagnant powder or granular material into the transportation pipe, and continuously repeats the function of returning the transportation load to the normal state. Even if the transportation speed is slow, clogging does not occur. Therefore, even if the granular material has a large wall friction coefficient and is wet and has high adhesiveness and poor air permeability, stable transportation should be performed at low speed. You can

As described above, the technical problems described above can be solved by the above means, and the problems of the conventional technology can be solved.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a high-pressure transportation apparatus for powder or granules according to the present invention, in which 1 is a powder or granular material G on the upper surface.
Is a blow pot (pressurization tank) in which a supply hopper 2 is continuously provided, and a transport pipe 3 is continuously provided on a bottom surface side, and 4 is a supply pipe 5 connected to an upper portion of the blow pot 1 and each of the transport pipes 3. , 6
The main supply pipe for sending compressed air from the compressor 7 is shown in FIG.

Further, 8 is an air knife attached to the root end side portion of the transportation pipe 3, and 9 is a supply pipe for supplying compressed air from the main supply pipe 4 to the air knife 8. The illustrated air knife 8 is a mechanism for introducing the compressed air sent from the supply pipe 9 into the external air chamber 8a, and then blowing the introduced compressed air into the transport pipe 3 through the orifice 8b that is tapered. However, this is an example of the embodiment, and as long as the compressed air can be blown into the transportation pipe 3 to move the powder or granular material G, a structure other than that shown in the drawing may be used.

Further, 10, 11, 12 are supply pipes 5, 6, which are connected to the blow pot 1, the transport pipe 3, and the air knife 8, respectively.
First, second, and third on-off valves installed in the middle of 9, and each of these on-off valves 10, 11, and 12 is controlled by a control unit 13 configured by using a microcomputer to supply the main supply pipe. Transport pressure detected by pressure gauge 14 installed in the middle of 4
When Ps reaches the set value (upper limit), the first and second on-off valves
The structure is such that 10 and 11 are closed and conversely the third on-off valve 12 is opened, and the transport pressure is based on the opening of the third on-off valve 12.
As soon as Ps drops to the lower limit, the third open / close valve 12
Is closed, and conversely, the first and second on-off valves 10 and 11 are opened. (See FIG. 3) In the figure, 15 indicates a seal gate provided between the blow pot 1 and the hopper 2, and 16 indicates a shut gate provided on the transport pipe 3.

FIG. 2 is a flow chart for explaining the operation of the present invention described above, and this is processed according to the program stored in the memory (not shown) of the control unit 13.

That is, in transporting the powder or granular material G, first, in step S1, the compressor 7 is operated to supply compressed air. This time,
Since the first and second on-off valves 10 and 11 and the third on-off valve 12 are alternately opened and closed, the granular material G in the blow pot 1 is supplied to the blow pot 1 and the transport pipe 3. It is pushed by compressed air and separated into plugs for transportation. The pressure of the compressed air supplied from the compressor 7 is set in advance to a pressure at which the powder G is transported at a low speed, for example, at a speed of about 1 to 5 m / sec.

In the next step S2, the pressure of the compressed air is detected using the pressure gauge 14, and in the next step S3, it is determined whether or not the transportation pressure has reached the set value (upper limit value).

When it is determined that the transportation pressure has reached the set value in step S3 due to the progress of the transportation, the procedure proceeds to the next step S4 to close the first and second opening / closing valves 10 and 11 that have been opened, and blowpot 1 stops the supply of compressed air to the transport pipe 3 and stops the transportation of the granular material G, while continuously opening the third on-off valve 12 to send compressed air to the air knife 8 and transport it. The granular material G is blown into the tube 3 to be transported (moved) to form a plug. The distance by which the powder G is transported by the air blow from the air knife 8, that is, the distance L between the plugs shown in FIG. 1 is, for example, about 0.5 to 1.5 m.

In the next step S5, it is judged by the pressure gauge 14 whether or not the pressure of the compressed air has returned, specifically, whether or not the lower limit value has been reached, and the pressure decreases as the third opening / closing valve 12 is opened. If it is determined that the lower limit value has been reached, the process proceeds to the next step S6 to open the first and second opening / closing valves 10 and 11 and close the third opening / closing valve 12, that is, the blow pot. 1 restarts the delivery of the granular material G, and the supply of compressed air to the air knife 8 is stopped. Then, the second step S2 is performed.
Return to and the transportation will continue. When the transportation is stopped, the compressor 14 is stopped in step S7.

Granules G transported by repeating the above steps S2 to S6
As shown in FIG. 1, they are separated in the form of a plug with an interval L of about 0.5 to 1.5 m, and are intermittently transported in the direction of the arrow in the drawing.

〔effect〕

The high-pressure transportation apparatus for powdery particles according to the present invention is as described above, and when the pressure reaches a set value due to the powdery particles, the transportation is stopped and air blown from the air knife to stagnate in the transportation pipe. Since the powder particles are forcibly transported, even if the transport speed is slowed, the powder particles can be intermittently transported in a stable state without causing the blockage of the duct, and the wall coefficient of friction is large. Even granular materials that are wet and have high adherence and poor air permeability can be safely transported at low speed, and a low pressure type compressor with a low running cost is used for the pressurizer, resulting in a low price for the entire device. It is also suitable for transporting granules, foods, minerals, etc., in combination with the fact that it has an economical advantage that can be realized, and has a simple structure and is easy to implement. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a high-pressure transportation apparatus for powder and granules according to the present invention, FIG. 2 is a flow chart for explaining a transportation procedure, and FIG. 3 is a flow rate and pressure during transportation. 4 and 5 are diagrams showing the relationship, and FIGS. 4 and 5 are diagrams showing the relationship between the air volume and the pressure at the time of stable transportation and at the time of pipe line blockage in the conventional example. 1 is a blow pot, 3 is a transport pipe, 4 is a main supply pipe, 5, 6, 9 are supply pipes, 7 is a compressor, 8 is an air knife, 10, 11 and 12 are opening / closing valves, 13 is a control unit, 14 is Pressure gauge, G is powder.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP 62-259920 (JP, A) JP 62-240220 (JP, A) JP 63-12523 (JP, A)

Claims (3)

[Claims] 1. An apparatus for high-pressure transport of powder or granules contained in a blow pot through a transport pipe by supplying pressurized gas to the blow pot and a transport pipe connected to the blow pot. In the middle of each supply pipe that supplies pressurized gas to the transport pipe, install an on-off valve that closes when the transport pressure reaches a set value, while attaching an air knife to the root end side part of the above transport pipe. A high-pressure transportation apparatus for powders and granules, characterized in that an on-off valve that continuously opens when the transportation pressure reaches a set value is installed in the middle of a supply pipe that supplies pressurized gas. 2. A pressure gauge for detecting the pressure of the pressurized gas is provided in the middle of the main supply pipe for supplying the pressurized gas to each of the blow pot, the transportation pipe, and each supply pipe of the air knife. The high-pressure transportation device for powdery or granular materials according to claim 1, characterized in that: 3. The pressure of the pressurized gas supplied to each of the supply pipes is set so that the powdery particles are transported at a low speed inside the transport pipe at a slow speed of, for example, about 1 to 5 m / sec. The high-pressure transportation apparatus for powder and granules according to claim 1, wherein