JPS6312519A - Pneumatic transport device - Google Patents

Abstract

PURPOSE:To decrease the air amount till being emptied to a great extent by introducing compressed air along the inner walls of an enclosed pressure tank when this tank and an associate transport pipe are to be emptied, and by increasing the intra-pipe wind speed using a minor amount of air. CONSTITUTION:When an enclosed pressure tank 1 and an associate transport pipe are to be emptied, the pulverized/granular substance residual in said pressure tank 1 are exhausted to the transport pipe with the aid of compressed air from a piping 29. If, at this time, the compressed air fed from the piping 29 is introduced along the inner walls 1a of the pressure tank 1, the air advances along the inner walls 1a with acceleration toward the exhaust hole. This accelerated stream of compressed air serves exhaustion of the residual pulverized/ granular substance to the transport pipe, and the substance is transported in the pipe. This makes the intra-pipe wind speed much greater than in conventional construction, which allows perfect exhaustion of the residual pulverized/ granular substance to a collection tank with a remarkably smaller amount of compressed air than in conventional construction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pneumatic transport device for plug transporting granular material.

[Conventional technology and its problems]

Consists of a closed pressure tank and a transport pipe connected to it,
A pneumatic transport device is known in which powder material discharged from the sealed pressure tank is transported into the transport pipe through a plug by supplying compressed air in pulses to the transport pipe. Plug transport means pressurized air i1 in the transport pipe.
'+ (pulses) and powder aggregate layers (plugs) are formed alternately, and the acting force of pressurized air passing through the plug due to the pressure difference between two pulses adjacent to the plug, that is, 1 wedge force.'' This is a method of propelling powder and granular materials using air, but when the powder and granular materials in the closed pressure tank and transport pipe are to be completely discharged, compressed air is introduced into the closed pressure tank. Although the remaining powder and granular material is discharged to the outside by pneumatic transportation, a large amount of compressed air must be consumed.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a pneumatic transport device capable of reducing the amount of compressed air required to empty a closed pressure tank and a transport pipe.

[Means for solving problems]

The above object consists of a closed pressure tank and a transport pipe connected to the tank, and by supplying compressed air in pulses to the transport pipe, the powder material discharged from the closed pressure tank is absorbed into the transport pipe. In the pneumatic transport device, compressed air is introduced into the sealed pressure tank when the inside of the closed pressure tank and the inside of the transport pipe are emptied. This is achieved by a pneumatic transport device characterized in that the inner wall surface of the sealed pressure tank is air-filled.

[For production]

When the inside of the closed pressure tank and the transport pipe are emptied, the compressed air overflows the inner wall of the closed pressure tank and is introduced, so that it is gradually accelerated toward the bottom of the tank and flows into the transport pipe. It is squirted.

Therefore, it is possible to increase the wind speed in the transport pipe with a smaller amount of air than in the past, and as a result, the amount of air required to empty the pipe can be greatly reduced.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, a pneumatic transportation device according to an embodiment of the present invention will be described with reference to the drawings.

In the figure, the pressure tank (1) has a main body (2) and a lid (3).
), and the opening of the main body (2) is hermetically covered by the lid (3). The duct (4) is integrated with the lid (3).
) is formed, which consists of a lower valve (5), an intermediate duct (
6), - Upper valve (7), flexible joint (
8) to the discharge opening of the hopper (9). The hopper (9) is supported on the ground via appropriate members.

The discharge port Qi) formed at the lower part of the main body (2) of the pressure tank (1) is connected to the discharge duct C11), and the outlet is connected to the long transport pipe αΦ via the air knife device 4 and the flexible joint 03. Connected. The transport pipe α is rigid rather than flexible, but it extends to the collection tank α and is supported on the ground in place according to the grammar Qυ (4). There is an air filter (to) on the top of the collection tank 07).
A valve 4 is provided at the discharge opening and is opened and closed by an actuating device (4).

The pressure tank (1) is supported on the ground by a hinge +2tl on the negative side wall side, and is supported on the ground by a hinge on the other side wall side. That is, the entire weight of the pressure tank (1) is measured by the a-docel (22). The pressure tank (1) can be seen from the ground using a flexible joint (
8) It is in a state of floating on C4, and its total weight is measured by the load cell 123 along with the valve (51 (7), duct (4) (6) (1υ), and the mechanical gamma knife device Q4. Since the weight of these and the body (2) and lid (3) of the pressure tank (1) is known in advance, the weight of the granular material in the pressure tank (1) can be determined from the output of the load cell +22. In addition, a pipe frame (c) is attached to the side wall of the pressure tank (1).
Due to this vibration, even if the powder particles do not form a bubble in the pressure tank (1), this will be ruptured, and the inside will always be able to maintain a good fluid state. There is.

Next, the distribution system to the pressure tank (1) will be explained.

A tank as a source of compressed air (2 width to
! Via 51 compressed air is supplied to the upper part of the pressure tank (1).

A valve is connected to the pipe C9, which allows the pressure supplied to the pressure tank (1) to be adjusted to, for example, 0.0 gauge pressure.
The pressure is adjusted to 5 to 0.6 atmospheres. Approximately 5Vse for air flow rate
c. For this purpose, a flow meter (to) and a pressure t#f@ are further connected to the pipe (2j). The granular material inside is pressed downward as a whole.

From pipe t251, pipe G33 (to C29) branches off to trunk J, which is the pipe related to the present invention (291 is connected to an electromagnetic pulp drum, from which compressed air is also supplied to the upper part of the pressure tank (1). However, during normal pneumatic transportation, that is, when granular material is present above the lower limit level of the pressure tank (1), the solenoid valve (7)
is closed and the above-mentioned valve C81 is open. In order to empty the pressure tank (1) and to completely discharge the granular material from the transport pipe α, the solenoid valve is opened, and the above-mentioned valve is closed, allowing a higher pressure to be released. Compressed air is sent into the pressure tank (1) at a flow rate of, for example, 15 to 20 m/catfish.

Furthermore, according to the present invention, the pipe tel has an open end (29a) to be inserted into the tank (1), as shown in FIG.
) is fixed to the tank (1) along the inner wall surface (1a) of the tank (1). Therefore, the compressed air blown out from here will be introduced along the inner wall surface (Ia) as shown by the arrow.

Branch pipe C3 connects to pressure tank (1) via valve (G)
It is connected to the discharge port θQ of. The powder material present in the pressure tank (1) is fluidized by the compressed air blown in from this, making it easy to discharge into the transport pipe α. The flow rate and pressure of the compressed air are adjusted using the flow rate # (g) and the pressure gauge (g) so that the compressed air is properly fluidized.

The branch pipe (G) is connected to the air knife device (6) via a valve and a solenoid valve +41. As is well known, the air knife device a4 blows out compressed air from a narrow gap on the outer periphery of the tube to cut the powder material in this area with a knife. Solenoid valve (4 (1) automatically repeats on and off and supplies pulsed compressed air. Flow meter 6
The pressure and flow rate of this compressed air are adjusted appropriately using a pressure gauge.

Solenoid valve (5) (7) C301 (40 (D
/ (Do portion t44) t451 C3υ (41) are each connected to the output terminal of the control circuit (43).

Further, the output terminal of the load cell (22) is connected to the input terminal of the control circuit (43).

Note that pressure needles (4) are connected to the tank (241) to detect the pressure inside the tank (1+241), and compressed air is supplied to it from a compressor (not shown) so that this pressure is within a predetermined range. It is assumed that

The present embodiment is configured as described above, and its operation will be explained next.

First, normal transportation conditions will be explained. Pressure tank (
1) Powder material is stored in the container above the lower limit level. This is detected by the load cell (221).In other words, the specific gravity of the powder material is measured in advance, and the material level is calculated in the control circuit (43) from this value and the detected material weight. It is determined that granular material exists in the pressure tank (1) at a level higher than the lower limit level, and the solenoid section t
44J (451C!υ is not energized, but a pulse-like flow is passed through the solenoid part (4υ) of the electromagnetic valve (4). compressed air is supplied.

On the other hand, in the upper part of the pressure tank (1), compressed air is piped (
251, supplied via valve e mark, pressure tank (]
) is pressed downwards as a whole. On the other hand, compressed air is also supplied from the discharge port αQ to keep the powder material in a fluid state. Vibrator G! The vibration of 31 prevents the formation of bridges of granular material in the pressure tank (1), resulting in a good and uniform flow state of the material. The tendency for material to adhere to the inner walls of the pressure tank (1) and create bridges is prevented.

Powder material flows smoothly from the pressure tank (1) into the duct Qη
and into the air knife device (2). The continuously supplied granular material is divided into parts (by intermittent compressed air) as if cut by a knife, and is transferred through the transport pipe H in the form of a plug as shown. (4η is the powder material sb, (
481 is air.

Particulate material is accumulated in the collection tank <171, and air is exhausted to the outside through a filter (g). The filter prevents the powder material from leaking to the outside.

When the load cell detects that the granular material in the pressure tank (1) has decreased and reached a predetermined lower limit level, the control circuit (43) activates the solenoid section (43) of the electromagnetic valve (5) (7).
1 (generates a signal that alternately excites 44I).

That is, the upper solenoid valve (7) is opened and the hopper (
9), the granular material is discharged into the duct (6). child\
When a predetermined amount or a predetermined period of time is discharged, the solenoid section (44J is demagnetized and the solenoid valve (7
) is closed. Next, the electromagnetic valve (5) is connected to the solenoid part (
451 is energized and opened, the powder material in the side duct (6) is discharged into the pressure tank (1). When the water is discharged for a predetermined period of time or when the duct (6) is empty, the solenoid section (4) is demagnetized and the electromagnetic valve (5) is closed.

Next, the upper electromagnetic valve (7) is opened by excitation of the solenoid part (the solenoid part), and the material is supplied from the hopper (9) into the duct (6).

As described above, the electromagnetic valves (5) and (7) are alternately opened and closed to supply powdered material from the hopper (9) into the pressure tank (1) via the intermediate duct (6). Even during this replenishment, the material is continuously supplied from the pressure tank (1) to the transport pipe ←4, and the material is transported by a plug using pulsed compressed air. Compressed air is continuously supplied to the upper part of the pressure tank (1) from the pipe (c), but as mentioned above,
By alternately opening and closing the 1L magnetic valve (51(7)), this compressed air is prevented as much as possible from being exhausted from the hopper (9) into the atmosphere. That is, pressure loss during replenishment is prevented as much as possible.

When the gold load cell +2Z detects that the granular material in the pressure tank (1) has been supplied to the predetermined upper limit level, the alternate excitation of the electromagnetic valves (5) (7) is stopped and both valves (5) ( 7) is closed.

Next, a case will be described in which the pressure tank (1) is emptied and the granular material is completely discharged from the transport pipe CIΦ.

In this case, it is assumed that the complete ejection button provided on the control path N (4) is pressed even though it is not shown in the figure.Load cell C21
Even if it detects that the granular material in the pressure tank (1) has reached the lower limit level, in this case, the solenoid valves (5) (7)
does not operate, and the solenoid valve (solenoid part 6 of 31t41
υ(41) are respectively excited and demagnetized. That is, the electromagnetic valve (2) opens and a large flow of compressed air is introduced into the pressure tank (1). Also, the electromagnetic valve (4
(No. 1 is normally closed, and the supply of compressed air in the form of a cipher is stopped.

The material in the pressure tank (1) is discharged into the transport pipe α by continuous high-pressure compressed air, and the material in the transport pipe α is discharged by this compressed air into the p collection tank αη. is discharged. Furthermore, due to the vibration of the vibrator (231), the amount of material adhering to the inner wall of the pressure tank (1) is reduced as much as possible.

The particulate material accumulated in the collection tank θ't) is supplied to the next process by driving the actuating device (e) to open the valve 01.

The embodiments of the present invention perform the functions described above, and particularly have the following effects.

In other words, the granular material remaining in the pressure tank (1) is discharged into the transport pipe by the compressed air from the pipe (c), but at this time, the compressed air from the pipe (to) As shown in Figure 2, the inner wall surface (1a) of the pressure tank (1)
) will be introduced cleanly. As it progresses along the inner wall surface (1a) and toward the discharge port (Lt), it is accelerated.

This accelerated compressed air flow removes the remaining powder material from the transport pipe 04.
1 and transported within this pipe α4. The air velocity inside the pipe is much higher than before. As a result, the remaining particulate material in the pressure tank (1) and transport pipes can be completely discharged to the collection tank (171) with an amount of compressed air that is -y smaller than the conventional method.

The embodiments of the present invention have been described above, but of course the present invention is not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the total weight of the pressure tank (1) is detected by the load cell, and each knob is controlled using this detection signal, but the present invention can also be applied to a pneumatic transport device that does not perform such control. is applicable.

Further, in the above embodiments, the piping (toward) is attached to a relatively upper portion of the pressure tank (1), but it may be attached to a lower portion. Furthermore, the shape of the pressure tank (1) is not limited to that shown in the drawings.

〔Effect of the invention〕

As described above, according to the pneumatic transport device of the present invention, the amount of compressed air for emptying the granular material in the closed pressure tank and the transport pipe can be further reduced compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a pneumatic transport device according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along line 1--2 in FIG. In the figure,

Claims (1)

[Claims] Consists of a closed pressure tank and a transport pipe connected to it,
By supplying compressed air in pulses to the transport pipe, the powder material discharged from the closed pressure tank is transported along the transport pipe as a plug, and the inside of the closed pressure tank and the transport pipe are In a pneumatic transport device that introduces compressed air into the sealed pressure tank when emptying the tank, the compressed air for emptying is introduced along the inner wall surface of the sealed pressure tank. Characteristic pneumatic transportation device.