JP2007246218A - Air transport device for powder and granule - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device which enables low-pressure air transport of wet powder and granule and is sanitary, labor-saving and highly operable, safe and economical. <P>SOLUTION: A discharge pipe 2 having an opened lower face is provided in the vicinity of a bottom face of a closed pressure tank lower part 10, and an upper compressed air supply pipe 3, an intermediate compressed air supply pipe 4 and a lower compressed air supply pipe 8 are connected. In addition, a secondary compressed air supply pipe 6 is connected to the discharge pipe 2. An opening of the discharge pipe 2 has a structure capable of adjusting its opening area according to conveyed objects. Powder and granule inside closed takes 1, 9, 10 are fluidized by compressed air alternately flowed in as pulse jet air 100 to 1,200 times per minute from a plurality of multidimensional directions from air supply pipes at a plurality of upper, intermediate and lower stages or at one lowermost stage, and smoothly transported via the discharge pipe 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an air transport device for wet powder particles, which is capable of stable air transport by low-pressure air transport, related to pneumatic transport of wet powder particles.

As described in Japanese Patent Application Laid-Open No. 2002-145687, a conventional shaker is attached to a pressurized tank, and the pressurized tank is vibrated to promote fluidization of the powder particles. The vibration exciter is an unbalanced rotating body system powered by an electric rotating machine.
JP2002-145687

However, since the entire transport machine is vibrated by a vibration exciter, the apparatus becomes very complicated and unsanitary due to vibration prevention measures, and there are problems such as deterioration of attached equipment and main body welded parts due to vibration.

    The present invention has been devised in view of the problems as described above to solve the problems. The object of the present invention is to force the entire transport machine to vibrate without compulsorily vibrating it. It is to promote fluidization of the powder.

The present invention takes the following technical means in order to solve the above problems. That is, instead of vibrating the pressurized tank with a vibrator, a plurality of air for transportation from a plurality of stages at the upper, middle, and lower parts of the tank, or from the lowest one in the pressurized tank, from a plurality of multidimensional directions, 100 to 1200 per minute. It flows in alternately as pulse jet air and promotes fluidization of the powder.

The apparatus of the present invention capable of suitably carrying out the above method is provided with a compressed air charging pipe disposed in a plurality of stages of the upper, middle, and lower parts of the pressurized tank, or one stage at the bottom, and the object to be transported is charged. An air transporting device for a granular material, characterized in that a discharge port having an opening is provided in the vicinity of the bottom surface of the pressurized tank while providing a charging inlet.

The present invention is to pneumatically transport a granular material by combining the following two actions a and b.

a. Fluidizing the granular material in the tank. In order to fluidize, fluidized air is supplied to form a fluidized bed. The fluidized air is alternately introduced as pulse jet air 100 to 1200 times per minute from a plurality of multi-dimensional directions from a plurality of compressed air charging pipes in the upper, middle and lower stages or in the lowest stage. As shown in FIG. 2, the upper compressed air charging pipe is disposed obliquely downward in the tangential direction of the pressurized tank, and stirs the granular material. Further, as shown in FIG. 3, the middle compressed air charging pipe is disposed downward toward the center of the pressurized tank, and moves the powder particles toward the discharge pipe. As shown in FIG. 4, the lower compressed air charging pipe is disposed in the tangential direction of the pressurized tank and stirs the granular material. The fluidization of the granular material is promoted by these three kinds of compressed air.

          b. Sending the fluidized granular material together with the fluidizing gas from the outlet near the bottom of the fluidized bed to the transport line.

By adjusting the opening area of the discharge port, it can be transported under optimum conditions corresponding to the particle size, specific gravity, and transport amount of the granular material. The air pressure is governed by the conditions of the granular material, the transport amount, the transport distance and the like.

  The granular material pneumatic transport device according to a preferred embodiment of the present invention includes a pressurized tank, a discharge pipe, and a compressed air charging pipe as main elements, and optimizes the shape and dimensions thereof, and the amount of granular material and air supply. Depending on the required conditions such as quantity and sequence control, it is possible to operate under optimal conditions comprehensively. The pneumatic transport apparatus for granular material of the present invention is particularly effective for pneumatic transportation of wet granular material, and fills a pressurized tank with wet granular material, and opens and closes this batchwise or alternately. A double damper can be provided for continuous charging, and the pipeline can be transported continuously with compressed air. The principle is that the particles of wet powder particles are fluidized while being loosened with pulse jet air, and the powder and air are completely mixed and discharged.

  That is, the wet granular material slides down the funnel-shaped pressurized tank slope by pulse jet air and is sent out together with the compressed air from the discharge pipe. By opening the opening position of the discharge pipe downward at the lower end of the funnel, the wet powder particles can be completely discharged without remaining in the pressurized tank. Therefore, there is no problem that the remaining amount is consolidated in the pressurized tank.

  The compressed air pressure and air volume to be used are sent at a compressed air pressure and air volume suitable for the properties of the target wet granular material, the processing amount, the conditions of the transportation pipeline, and the like. These can determine an appropriate solid-gas ratio and pressure loss by a simple test.

The pneumatic transport apparatus for granular materials of the present invention is very useful because it is hygienic, labor-saving, rich in operability and safety.

FIG. 1 shows an air transport device for granular materials according to an embodiment of the present invention. The sealed pressurized tanks 1, 9, and 10 having a diameter of 500 mm and a height of 1000 mm have a funnel shape. The apex angle of the funnel shall be 60 degrees or less. Therefore, the inclination angle of the slope of the funnel is 60 degrees or more. This angle can be selected according to the characteristics of the target granular material.

In the pressure tanks 1, 9, and 10, a discharge pipe 2 having an open bottom surface in the vicinity of the bottom surface is provided so as to coincide with the vertical center axis of the pressurized tank, and is connected to a transport duct outside the pressurized tank. Compressed air charging pipes are arranged in the upper, middle and lower parts of the pressurized tank.

Next, an embodiment in which wet salt is pneumatically transported using the apparatus of the present invention shown in FIG. 1 will be described based on the work system diagram shown in FIG. Wet salt is supplied to the pressure tank 1 from the granular material supply hopper 22. When the pressure tank level meter 13 detects wet salt in the pressure tank, the damper 24 is closed. At the same time, valves 18 and 20 for sending compressed air to the compressed air supply pipe 3 in the pressure tank 1 are alternately opened 100 to 1200 times per minute, and the compressed air is intermittently and instantaneously supplied to the pressure tank 1 in cycle air. Supply as a hammer. When the pressure in the pressure tank 1 reaches the transport set pressure, the pressure detection device 17 detects the pressure, thereby opening the discharge valve 15 of the discharge pipe 2. At this time, the wet salt is sufficiently floated and fluidized by the swirl flow by the cycle air hammer, and the compressed air controlled by the pressure air flow regulators 16, 19, and 21 is discharged along with the wet salt. 2 is pneumatically transported through a transport pipe 25 of a translucent soft vinyl chloride hose having an inner diameter of 50 mm. The transport pipeline is 5 m vertically upward and 40 m horizontal. At this time, the pressure in the pressure tank 1 was 0.16 Mpa, the air volume was 3 Nm3 / min, the transport volume was 117 kg / min, and the cycle air hammer was 600 times per minute. The bottom surface and the inner surface of the pressure tank 1 had no remaining amount such as attachments and bridges, and could be transported entirely. When there is no wet salt as a transported material in the pressure tank and the transport duct, the air resistance is lost and the pressure is lowered. A pressure drop is detected by the pressure detection device, the compressed air supply valve is closed, the transport input damper 24 is opened again, a certain amount of wet salt is supplied into the pressure tank 1, and the above series of operations is repeated. The secondary compressed air supply pipe 6 is intended to adjust the ratio of the amount of transported goods and the amount of air in order to prevent clogging of the transported goods in the duct.

In the pneumatic transportation apparatus, pneumatic transportation was performed with a mill scale (metal powder) containing water and a bulk specific gravity of 3, a particle diameter of 6 mm or less, and a moisture content of 15%. The transport duct is a carbon steel pipe for piping 50A (inner diameter 52.9 mm), a vertical transport pipe 20 m up, and a horizontal transport distance 30 m. At this time, the pressure tank internal pressure was 0.19 Mpa, the air flow rate was 4 Nm3 / min, the transport amount was 92 kg / min, and the cycle air hammer could be easily transported at 600 times per minute.

As a granular material, it applies to the granular material of an inorganic organic natural product and an artificial product. For example, salt, sugar, seasoning powder, resin powder, fertilizer, chemicals, grain powder, metal powder, metal oxide powder, rubber, silica sand, porcelain stone, cement, sand, food, chemical, ceramics, metal, etc. It can be widely applied to the handling of granules. It is particularly suitable for handling wet powder particles, and powder particles immediately after washing can be easily transported.

Longitudinal cross section of pneumatic transport device for powder Sectional view taken along the line AA in FIG. Sectional view of BB part in Fig. 1 CC sectional view of FIG. Operation system diagram of pneumatic transportation equipment for granular materials

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure tank upper part 2 Discharge pipe 3 Upper compressed air supply pipe 4 Middle compressed air supply pipe 5 Clamp joint 6 Secondary compressed air supply pipe 7 Clamp band 8 Lower compressed air supply pipe 9 Pressurized tank middle part 10 Pressurized tank lower part 11 Clamp joint 12 Clamp band 13 Level gauge 14 Pressure detection device 15 Upper compressed air valve 16 Pressure air flow regulator 17 Discharge valve 18 Middle compressed air valve 19 Pressure air flow regulator 20 Lower compressed air valve 21 Pressure air flow regulator 22 Supply Hopper 23 Control device 24 Damper 25 Soft vinyl chloride hose

Claims (2)

A pressurized tank is provided with an inlet for charging the object to be transported, a discharge pipe having an opening in the vicinity of the bottom of the tank is provided, and a compressed air charging pipe is provided at the upper, middle and lower parts of the tank, and An air transportation device for powdery particles, characterized in that a secondary air charging tube is disposed in the discharge tube. From the compressed air charging pipes at the upper, middle, and lower parts of the pressurized tank, air for transportation is flown alternately as pulse jet air 100 to 1200 times per minute from multiple directions, fluidizing the powder and pumping it. Pneumatic transporter for particulates characterized by

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