JPH06156724A - Method for pneumatically transporting powder material having high coefficient of friction - Google Patents

Abstract

PURPOSE:To prevent the occurrence of agglomeration of the powder material at the time of pneumatic transportation of the powder material. CONSTITUTION:An air supply nozzle 4 for accelerating the powder material, which is fed from the bottom part of a transporter 2 for housing the powder material, with the pressurized air and for sending the powder material to a transporting pipe 5 is provided, and the transporting pipe 5 is provided with boosters 6 arranged with a specific space. The powder material quantity fed from the transporter 2 and the air quantity to the air supply nozzle 4 are controlled, and the powder material is sucked for mixture by the air flow jetted from the air supply nozzle 4 to obtain an even mixture ratio, and the high density and high speed transportation is performed at this even mixture ratio. The powder material discharged from the transporter 2 is thereby forcedly mixed with the jetted air from the air supply nozzle 4 by the ejector work of the jetted air to obtain an even mixture ratio (density), and the powder material at the even mixture ratio is transferred without generating the lump condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transporting powder, especially powder having a high coefficient of friction, by pressurized air.

[0002]

2. Description of the Related Art FIG. 4 shows a procedure for transporting ordinary powder by compressed air. The transport device 50 includes a transporter 51 that stores powder, a transport pipe 52 that transports the powder stored in the transporter 51 by an air flow, and a booster 53 that is attached to the transport pipe 52 at a predetermined interval. With. The transporter 51 has a cylindrical shape in which the upper part is hermetically closed and the lower part is squeezed into a conical shape, and the powder is received from above by appropriate means, and the top air supply is provided with a check valve for pushing out the powder to be stored by an air flow. A tube 54 and a number of lower jet nozzles 55 with check valves are attached to the lower cone 51a. The lower jet nozzle 55 is tangentially attached to the conical surface. Thus, the powder to be stored is discharged by the supply of the pressure air from the upper top air supply pipe 54, and the ejection of the pressure air from the lower jet nozzle 55 prevents the adhesion or the formation of the bridge on the conical portion.

Reference numeral 56 denotes an air vent tube, and the transporter 5
The valve 57 is opened at the time of supplying the powder to the inside of 1, and the excess air accompanying the filling of the powder into the transporter is discharged through the dust collector 58. Denoted at 60a and 60b are level meters for detecting the amount of accumulated powder in the transporter 51.

The booster 53 has a check valve 61 and is connected to a booster air supply pipe 62. Reference numeral 63 indicates a supply air amount control unit, and line L10 is a high pressure line and is a top air supply pipe 54 attached to the upper portion of the transporter 51.
Connected to. L11 is a pressure air supply line for the jet nozzle 55 attached to the lower conical surface of the transporter, L12 is a booster air supply line connected to the booster air supply pipe 62, and lines L11 and L12 are provided with regulators 64 and 65, respectively. Controlled by pressure,
It is opened / closed by electromagnetic on-off valves 66, 67, 68.

In the above structure, after a predetermined amount of powder is supplied to the transporter 51, pressure air is blown tangentially from the lower jet nozzle 55 to the conical portion together with the top air supply pipe 54 to prevent the formation of bridging. The powder is sent out into the transport pipe 52. A large number of boosters 53 are provided in the transport pipe 52, and compressed air is blown into the transport pipe,
This transfers the powder.

[0006]

According to the above-mentioned transportation method, there is no problem when the powder is light and slippery, such as iron oxide, but the single particle mass of PVC powder or the like is large, and the other powders are angular. Alternatively, when powder such as scale-like powder having a large coefficient of friction between particles is pneumatically transported at a high concentration and at low speed, there is no problem if the transportation pipe is short, but if it is long, the pipe inside the transportation pipe It becomes a bottom flow and unstable transport is likely to occur, and the powder particles become entangled with each other to form a lump, which clogs the pipe line like a plug and pops out intermittently as the transport pressure rises, causing so-called hammering and noise. However, there is a problem in that each part is vibrated and damaged. For this reason, even if the flow velocity and air volume of the transport air were increased, the pipe vibration was rather large and a line shock trouble occurred. The present invention has been made in view of these points, and an object of the present invention is to provide a transportation method that prevents the above-mentioned lumps and uniformly transports to a certain concentration.

[0007]

In order to achieve the above-mentioned object, a method of transporting a powder of high friction coefficient powder according to the present invention is provided in a bottom portion of a transporter for accommodating the powder, applying pressurized air and discharging the powder from below. A booster having a discharge control valve provided, an air supply nozzle for accelerating the powder delivered through the discharge control valve by pressure air to send the powder to the transport pipe, and a checker mechanism arranged in the transport pipe at predetermined intervals. After filling the transporter with powder and applying pre-pressurization, the discharge adjustment valve is opened and the pressure air supply valve for the air supply nozzle and the pressure air supply valve for the booster are synchronized with the discharge of the powder. Open the air conditioner, adjust the amount of powder sent from the transporter and the amount of air to the air supply nozzle, and suction and mix the powder with the air flow ejected from the air supply nozzle to achieve high-concentration high-speed transportation with a uniform mixing ratio It is obtained by way.

[0008]

[Operation] The powder sent from the transporter is
It is sucked by the pressure air jetted from the air supply nozzle, mixed, and sent out into the transport pipe with a uniform mixing ratio (uniform density). After that, since it is mixed with the air supplied under pressure from the booster, it does not become a lump. Therefore, high-concentration transportation is possible.

[0009]

EXAMPLES FIGS. 1 to 3 show a transportation apparatus for carrying out the method of the present invention. Similar to a well-known structure, this transporting device 1 has a transporter 2 in which an upper part is hermetically sealed and a lower part is conically narrowed into a cylindrical shape, and a transporter 2 below the transporter 2 is connected via an electromagnetic on-off valve 3. Air supply nozzle 4 and the air supply nozzle 4
And a booster 6 arranged at predetermined intervals on the transport pipe 5. The transporter 2 is provided with a top air supply pipe 8 together with the powder supply pipe 7 on the upper side, a check valve on the lower cone portion 2a, and a plurality of lower jet nozzles 9 tangential to the conical surface. Reference numeral 10 denotes an air vent pipe, which is connected to a dust collector 12 via an opening / closing valve 11. The booster 6 is provided with an adjusting valve 61 to sequentially change the pressure, so that the amount of air in front is increased and the amount of air is decreased toward the front.

The air supply nozzle 4 is shown in FIGS. The air supply nozzle 4 has a slide valve 22 that can move in and out of a vertical passage 21 that communicates with the transporter side of the housing 20.
A nozzle pipe 24 inserted into a horizontal passage 23 formed in an inverted T shape is provided at the bottom of the vertical passage 21. Reference numeral 25 denotes a detent pin that faces the vertical groove 26 formed in the slide valve 22 and allows the valve to slide in the front-rear direction but prevents the valve from rotating. 27 and 28 are fixed nuts. The nozzle tube 24 has at least a length that traverses the vertical passage 21, and the jet air flow from the nozzle tube sucks, mixes and discharges the powder fed from the vertical passage 21 by the ejector effect. Reference numeral 15 denotes a connecting short tube to which the booster 17 is attached.

Reference numeral 30 in the drawing denotes a gas control unit, which is connected to an air receiver 31 for supplying high-pressure air, is supplied with a top air supply line L1 for a top air supply pipe 8 for the transporter 2, and a supply line for a jet nozzle 9 provided below the transporter. L2 and a supply line L3 for the booster 6, which are set to a predetermined pressure by regulators 31, 32 and 33, respectively, and the electromagnetic opening / closing valve 3
It is opened and closed by 4, 35 and 36. The supply line L4 to the high-pressure air ejection passage 16 connecting the air supply nozzle 4 preferably supplies as much high-pressure air as possible, and in the example shown in the figure, the regulator is omitted and only the electromagnetic opening / closing valve 37 is provided. Although the example in which it is provided is shown, a regulator may be provided in this line L4 to adjust the pressure. The example shown in the drawing shows an example in which a line L5 is further provided to the high-pressure air ejection passage 16 so that the increase in the supply air amount from each booster 17 can be measured. 18 is a connecting short pipe portion provided in the connecting short pipe 15, 38 is a regulator provided in the line L5,
Reference numeral 39 is an electromagnetic on-off valve.

In the above structure, the powder is supplied by the supply pipe 7, and when the accumulated powder reaches the upper level meter 14a, the on-off valve 13 is closed and the compressed air is supplied from the top air supply pipe 8 into the transporter 2. Supply and maintain at a predetermined pressure. Next, when the powder is sent out, the electromagnetic opening / closing valves 3 and 39 for the air supply nozzle 4 and the electromagnetic opening / closing valve 36 for the booster 6 are opened together with the electromagnetic opening / closing valve 3 in the lower part of the transporter 2.

As a result, a large amount of high pressure air is ejected from the nozzle pipe 24 of the air supply nozzle 4 toward the transport pipe 5 side, and the powder from the transporter 2 side is sucked by the ejected air by the ejector action and the air is ejected. And the mixture is sent to the side of the transport pipe 5 as a uniform mixing ratio (concentration) without causing unevenness. In this case, the concentration can be high.

The mixture of powder and air sent in this state is transferred while being further accelerated in the transport pipe by supplementing the pressure air from the booster 6, so that the powder particles are not entangled with each other to form a lump. The mixture is transferred while maintaining the state of the mixture.

The jetting of the compressed air from the jet nozzle 9 attached to the lower portion of the transporter 2 may be continuously jetted, but the formation of bridging of powder and the fluidization of powder are smoothed. It is more effective to eject intermittent pulse jet air so that the air is discharged to the air.

[0016]

As described above, according to the transportation method of the present invention, an air supply nozzle is provided at the powder discharge portion from the transporter, and a large amount of high-pressure air ejected from the nozzle for the powder delivered from the transporter. Is ejected, and is forcibly mixed with the ejected air by the ejector action, and is transferred by a smooth flow with a uniform mixing ratio (concentration), so that the transport tube becomes clogged as in the past and a certain pressure is reached. When it does, it pops out and causes hammering, which completely eliminates the conventional drawbacks such as the generation of noise and vibration of pipes and the damage to various parts, and the powder can be conveyed smoothly.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram of a transportation device for carrying out a transportation method of the present invention.

FIG. 2 is a vertical sectional view of an air supply nozzle.

FIG. 3 is a sectional view taken along line XX in FIG.

FIG. 4 is an overall circuit diagram of a powder gas transportation device of a conventional example.

[Explanation of symbols]

 1 Powder Transport Device 2 Transporter 3 Emission Control Valve 4 Air Supply Nozzle 5 Transport Pipe 6 Booster

Claims (2)

[Claims] 1. A discharge adjusting valve provided at the bottom of a transporter for containing powder and applying pressure air to discharge the powder from below, and accelerating the powder sent out through the discharge adjusting valve with pressure air. An air supply nozzle that sends out to the transport pipe and a booster having a check mechanism arranged at predetermined intervals in the transport pipe are provided, and the transporter is filled with powder and pre-pressurized, and then a discharge control valve is provided. In synchronization with the discharge of the open powder, the pressure air supply valve for the air supply nozzle and the pressure air supply valve for the booster are opened, and the amount of powder sent from the transporter and the air amount for the air supply nozzle are adjusted to supply air. A gas transportation method of high friction coefficient powder, characterized in that powder is suction-mixed by an air flow ejected from a gas nozzle to carry out high-concentration high-speed transportation with a uniform mixing ratio. 2. The high friction coefficient according to claim 1, wherein the jet air is supplied to the transporter cone portion at a predetermined interval when the powder transportation is started, and the fluidization of the powder is achieved by the pulse jet air. Powder gas transportation method.