Agitating – By injecting gas into mixing chamber – Intermittent or pulsating feed
Reexamination Certificate
1999-04-12
2001-10-16
Soohoo, Tony G. (Department: 1723)
Agitating
By injecting gas into mixing chamber
Intermittent or pulsating feed
C366S136000, C422S145000
Reexamination Certificate
active
06302573
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of material mixing, breaking of caked material, pneumatic transportation and granulation, and in particular a handling method and system for powdered or granular material using pulsating vibration air.
PRIOR ART
Conventionally, powdered or granular material has been mixed or blended in a tank by rotating a mixing vane provided in the tank or by supplying pressurized air from the bottom of the tank to blow the material.
Powdered or granular material stored in a tank has been pneumatically transported in a transport pipe by supplying pressurized air into the tank while the tank is made airtight.
However, such a conventional mixing method of material wherein a material container is rotated or a mixing vane is provided in the tank has the disadvantage that the construction is complex and the system is noisy when material is being mixed. Further, for highly adhesive or absorbent material, the material adheres to the tank and on the mixing vane.
Moreover, in the conventional mixing method, the air to blow up the material in the tank generates turbulent flow because the material in the tank is blown up by supplying pressurized air from the bottom of the tank. As a result, only the material stored in the center of the tank is scattered upwardly in the tank, with a lot of fine particles being generated. Under these circumstances, the material can't be mixed uniformly.
In a conventional pneumatic transportation system for powdered or granular material, a rathole, that is an air passage, is formed in one part of a layer of the material when the material stored in the tank is highly absorbent. When such a rathole is formed, only pressurized air is transported and the material can't be transported nor discharged completely.
Further, if highly adhesive material or highly absorbent material such as food stuff is stored in the tank for a while, such material is concreted or caked in the tank, or bridging of the material is formed when the material is discharged.
An air hammer or a vibrator is provided for the tank in a conventional system in order to solve the above-mentioned problems. However, the air hammer or vibrator causes vibration, noise and furthermore causes tank deformation. Depending on the material, air contained in a space between particles is discharged so that the material is caked and blockage is promoted.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method wherein powdered or granular material is mixed uniformly without using a mixing vane. A further object of the present invention is to provide a method wherein powdered or granular material is effectively mixed and transported in a transport pipe without generating adhesion or blockage of the material in a storage tank and the transport pipe even if the material is highly cohesive. A still further object of the present invention is to provide a method of breaking the concreted or caked powdered or granular material and to provide a granulating system
A mixing and blending method of powdered or granular material is proposed for supplying pulsating vibration air into an airtight tank from a bottom thereof The airtight tank has a porous bottom plate on which the material is stored. In the mixing and blending method, pulsating vibration air is generated by periodically increasing and decreasing the amount of blowing air at a low frequency, and pulsating vibration air is introduced into the airtight tank from the bottom of the airtight tank so as to generate air flow which travels upward through the porous bottom plate of the airtight tank. Therefore, powdered or granular material stored on the porous bottom plate in the airtight tank is uniformly mixed and blended in the airtight tank while continuously moving up and down in a convectional manner.
A break method of blocking powdered or granular material stored in an airtight tank utilizing pulsating vibration air is provided. In the break method, air is injected into the airtight tank through a porous bottom plate on which the material is stored, pulsating vibration air is simultaneously generated and introduced into the airtight tank. The pulsating vibration air is generated by periodically increasing and decreasing the amount of blowing air at a low frequency. As a result, caked or adhered material in the airtight tank is broken.
A mixing and blending system for powdered or granular material utilizing pulsating vibration air is comprised of an airtight tank having a porous bottom plate for storing powdered or granular material thereon. The system is also provided with pulsating vibration air generation means for generating pulsating vibration air by periodically increasing and decreasing the amount of the blowing air at a low frequency and for supplying the pulsating vibration air into the airtight tank from the bottom of the airtight tank through the porous bottom plate.
A mixing and blending system for powdered or granular material utilizing pulsating vibration air is provided with an airtight tank having a porous bottom plate for storing powdered or granular material thereon, and pulsating vibration air generation means for generating pulsating vibration air by periodically increasing and decreasing the amount of blowing air at a low frequency and for supplying the pulsating vibration air into the airtight tank from the bottom of the airtight tank through the porous bottom plate. The system is also provided with material recovery means provided above the airtight tank and having a filter for collecting and separating fine particle dispersing in the airtight tank from air, and the material recovery means has a suction port for drawing fine particles dispersing in the airtight tank and a discharge port for returning powdered or granular material collected by the filter into the airtight tank.
A pneumatic transport system for powdered or granular material utilizing pulsating vibration air is comprised of an airtight tank having a porous bottom plate for storing powdered or granular material thereon, and pulsating vibration air generation means for generating pulsating vibration air by periodically increasing and decreasing the amount of blowing air at a low frequency and for supplying the pulsating vibration air into the airtight tank from the bottom of the airtight tank through the porous bottom plate. The pneumatic transport system is also comprised of gas supply means for supplying pressurized air in the airtight tank so as to forcibly send forth the powdered or granular material outwardly from the airtight tank.
A pneumatic transport system for powdered or granular material utilizing pulsating vibration air is provided, where material recovery means causes convection while drawing the fine particles dispersing in the airtight tank, separates the material from the air, and returns it to the airtight tank as recovery material when powdered or granular material is mixed and blended.
A pneumatic transport system for powdered or granular material utilizing pulsating vibration air is provided, where the material recovery means draws the fine particles dispersing in the airtight tank, separates the material from the air and returns it to the airtight tank as recovery material when powdered or granular material in the airtight tank is pneumatically transported out of the airtight tank.
A granulating system for powdered or granular material stored in an airtight tank having a porous bottom plate and a spray gun, wherein material is granulated by spraying liquid binder with the spray gun while material is dispersing over the porous bottom plate in the airtight tank. The system is provided with pulsating vibration air generation means for generating pulsating vibration air by periodically increasing and decreasing the amount of blowing air at a low frequency and for supplying the pulsating vibration air into the airtight tank from the bottom of the tank through the porous bottom plate, and gas supply means for supplying pressurized air in the airtight tank so as to forcibly sen
Morimoto Kiyoshi
Murata Kazue
Sanada Yoshika
Tokuno Sanji
Watanabe Yasushi
Jones Tullar & Cooper P.C.
Kyowa Hakko Kogyo Co. Ltd.
Soohoo Tony G.
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