JP2001315961A - Pneumatic feeding method and pneumatic feeding device for power and grain-like material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pneumatically feed an adhesive powder and grain-like matter by air injection force. SOLUTION: In the pneumatic feeding of the adhesive powder and grain-like matter such as sugar, salt or titanium oxide by compressed air, an injection sucking force is imparted thereto from the circumference to pneumatically feed the powder and grain-like material from a feed hopper 6 to a receiving tank 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for pumping a powdery or granular substance having a high adhesive property or an adhesive property by an air flow.

[0002]

2. Description of the Related Art Conventionally, in the case of transporting powdery or granular substances having high or adhering properties, such as sugars (e.g., white sugar, medium sucrose, trisucrose, etc.), salts, and titanium oxide, vibration conveyors, belts, Mechanical transport devices such as conveyors, screw conveyors, and bucket elevators have been used. However, in such transport machines, fine metal chips generated by wear and powdery and granular substances adhered to and deteriorated in the equipment are mixed and cause product contamination, and cleaning of the process including the equipment must be performed. Was needed. However, due to the complexity of the equipment structure, transportation using conventional transportation equipment requires a lot of labor and labor for maintenance of the equipment, and enormous cost is required for updating the equipment. Further, depending on the transport distance, a large facility area is required, and the equipment cost of the equipment is large, and there is a problem that maintenance and management are troublesome and costly.

[0003] Therefore, studies have been made on other transporting methods instead of the transporting method using a mechanical transporter, and as a result, there has been provided an apparatus for pumping the above-mentioned powdery or granular material by the force of air. For example, in the case of the technology provided in Japanese Patent Application Laid-Open No. 6-278869, the granular material is transported by high-pressure air. However, the present invention is not directly applicable to a method in which an adhered particulate material is transported by a pneumatic flow.

Further, there is a method of transporting wet salt, which easily aggregates and has a high specific gravity, by air pressure. However, since the transport target is special to wet salt, a funnel-shaped filter cloth is used. It is not suitable for the pneumatic transport of such particulate matter.

Further, in the method of transporting the particulate material by air pressure, it is common to connect the supply hopper and the receiving tank of the particulate material by a transport pipe, but the inside of the supply hopper and the receiving tank is cleaned. Although it is easy to do, a technique for cleaning the inside of the transport tube is not disclosed.

SUMMARY OF THE INVENTION In view of the above-mentioned various problems of the prior art, the present invention sends powdery or granular substances such as sugar, salt, titanium oxide and the like supplied to a hopper by high pressure air while feeding them. It is intended to provide a method and an apparatus for air-pumping a particulate material, which can send the particulate material without backflow by forcibly sending the compressed air sucking the particulate material in a certain direction. It is the purpose.

[0007] The present invention also provides a method for air-pumping powdery and granular substances, which prevents the drying of the sugar by compressed air when the sugars are pneumatically supplied as the powdery and granular substances and does not impair the moist feeling and flavor of the sugars. It is intended to do so. Still another object of the present invention is to provide a pneumatic device for feeding granular material which can effectively clean the inside of the tube for feeding granular material.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the method of the present invention is characterized in that, when a highly adherent or adherent particulate material is pumped by an air stream, the particulate material is replenished by a fixed amount. The compressed air is fed into the supply hopper 6, and the granular material is pumped toward the receiving tank 7 through the pressure feed pipe 8, and an air flow is jetted against the powdered granular material to be pumped, and the granular material is sucked to receive the receiving tank 7. To be pumped.

The method of the present invention also includes a supply hopper 6 for replenishing powdery and particulate matter in a fixed amount when a powdery or particulate substance having high or high adherence is fed by an air stream, and a receiving tank 7 for powdery and particulate matter. And an ejector 12 provided in the feed pipe 8 in the vicinity of the feed hopper 6 while feeding compressed air into the feed hopper 6.
Supply hopper 6 by suction
To the receiving tank 7 from above.

Further, in the method of the present invention, when high-adhesive or adherent sugar is pumped by an air stream, compressed air conditioned by supplying steam is supplied into a supply hopper 6 for replenishing the sugar by a fixed amount. Feeding, pressure pipe 8
The sugar is pumped toward the receiving tank 7 through the air, and an air stream is injected against the sugar to be pumped, thereby sucking the sugar and receiving the sugar.
To be pumped.

In addition, the apparatus of the present invention comprises a supply hopper 6 for continuously supplying a fixed amount of the particulate material when the particulate material having a high adhesive property or an adhesive property is pumped by an air stream; Is connected to the receiving tank 7 by a pressure feeding pipe 8, and compressed air for feeding the granular material to the receiving tank 7 is fed into the supply hopper 6, and an ejector 12 is provided in the pressure feeding pipe 8 near the supply hopper 6. Is provided so that the powdery and particulate matter can be sucked and ejected. In the method and the apparatus of the present invention, the inside of the pressure feed pipe 8 connecting the supply hopper 6 and the receiving tank 7 can be washed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, reference numeral 1 denotes sugar having high adhesion or adhesion with water,
It is a storage tank for powdery and granular substances such as salt and titanium oxide. In the following description, a case in which sugar (upper sucrose, medium sucrose, trisucrose, etc.) which is used daily is used as the powdery substance will be described.

The storage tank 1 is externally provided by appropriate means and method.
The sugar fed into the container is supplied in a fixed amount to the chute 4 located directly below via the metering device 2 or from the metering device 2 via the conveyor 3 such as a vibrating conveyor. You. In addition, as the fixed amount supply device 2,
A known electromagnetic feeder, screw conveyor, or the like can be used.

The sugar supplied to the chute 4 is continuously replenished through a rotary valve 5 to a supply hopper 6 installed below the chute 4 in a fixed amount. The supply hopper 6 and the sugar receiving tank 7 are connected by a pumping pipe 8, and the compressed air is pumped into the supply hopper 6 from the air compressor 9 through the air flow path, so that the sugar is supplied to the pumping pipe 8 by the pumping force of the air. As a result, it is sent to the receiving tank 7 via the cyclone 10. In the cyclone 10, the compressed air is released to the outside, and only the sugar is sent to the receiving tank 7.

An ejector 12 is provided between the pressure feed pipe 8 and the discharge port 11 below the supply hopper 6. As shown in detail in FIG. 2, the ejector 12 has a cylindrical inner wall 15 that forms a flow passage 14 that extends from the supply hopper 6 to the pressure feed pipe 8 in an annular pressure feed unit 13 having an internal space. An annular ejection slit 17 is provided between a lower end surface of the inner wall 15 and an inner surface of an outer wall 16 formed in a downwardly conical shape below the pumping portion 13, and is supplied from the air compressor 9 into the ejector 12. The compressed air branches off from the flow path of the compressed air sent to the hopper 6 and is sent.

When the sugar in the supply hopper 6 is pressure-fed by the compressed air sent from the air compressor 9, the compressed air branched from the air compressor 9 is ejected from the ejector 12.
When the compressed air is sent into the pressure feeding section 13, the compressed air is jetted downward from the jetting slit 17, so that a negative pressure is generated in the air flow sent from the supply hopper 6 to suck the sugar by the jet flow, Are transported in a forced airflow toward the receiving tank 7.

Therefore, the sugar in the supply hopper 6 is transported in the pressure feed pipe 8 by the pressure feed by the compressed air sent into the supply hopper 6 and the suction pressure by the jet air flow from the ejector 12. . And the supply hopper 6
Since a negative pressure suction force acts on the sugar inside, the sugar is not accompanied by the flow of the compressed air without being scattered at the junction of the sugar and the compressed air, thereby preventing the sugar from adhering to the inner wall of the pressure feeding pipe 8. .
The supply of the compressed air to the ejector 12 may be performed by using an independent air compressor without branching from the flow path of the compressed air from the air compressor 9.

The ejector 12 shown in FIG. 2 simply injects air straight from the injection slit 17 in the direction of pumping sugar, while FIG. 3 shows another shape of the pumping section 13. . That is, the ejection guide plate 1 inclined on the inner surface of the outer wall 16 in a fixed direction with respect to the radial direction of the pressure feeding unit 13.
8 are provided at a predetermined interval.

The air fed from the injection slit 17 generates a vortex or a swirling flow toward the center of the pumping tube 8, and the sugar also generates a vortex or a swirling flow to produce the swirling flow.
Will be pumped inside. When the swirling flow (vortex) is generated in the pumping pipe 8 in this manner, the center of the swirling (vortex) has a low atmospheric pressure, and sugar easily flows through the center of the pumping pipe 8, and the sugar flows into the pipe wall of the pumping pipe 8. Adhesion can be prevented. Further, the swirling flow of the compressed air has an action of stripping the sugar attached to the inside of the pressure feed pipe 8.

In FIG. 1, reference numeral 19 denotes the supply hopper 6.
The heating device is provided on the outer peripheral surface of, for example, a jacket 20 is provided on the outer periphery of the supply hopper 6 to form a two-tank structure, and hot water is supplied and circulated in the jacket 20 to heat the entire supply hopper 6. Has become. Thereby, the sugar, the compressed air and the like in the supply hopper 6 are heated, the water content in the sugar is adjusted, and the sugar does not adhere to the inner surface of the supply hopper 6. In addition, supply hopper 6 instead of hot water
May be electrically heated. Moreover, in order to prevent the adhesion of sugar, the inner wall surface of the supply hopper 6 may be coated with a fluororesin.

In the above embodiment, the air compressor 9
Compressed air is supplied to the supply hopper 6 and compressed air branched on the way is sent to the ejector 12. A humidity controller 21 is installed in the compressed air flow path, and the humidity controller 21 Then, steam may be sent to the compressed air to heat the compressed air and to give the compressed air an appropriate humidity.

When powdery or granular substances such as salt and titanium oxide are pumped by compressed air, it is better to dry them to some extent to prevent them from forming lumps. But,
When sugar is used as the powdery or granular substance, the moisture of the sugar may fly off due to the compressed air and dry. When subjected to rapid drying, sugar has a property of solidifying into a lump.
In addition, the content of water is defined in the standard of sugar, and particularly, the content of water such as white sucrose or medium sucrose has an important role to keep moist feeling, soft feeling, and flavor. . Therefore, by adding steam to the compressed air and adjusting the humidity, the sugar can be given an appropriate moist feeling and flavor. In the figure, reference numeral 22 denotes a pressure gauge, and 23 denotes a thermometer.

If the particulate matter is transferred for a long period of time, the particulate matter easily adheres to the inside of the pressure-feeding pipe 8, and it is necessary to wash the inside of the pressure-feeding pipe 8 as necessary or periodically. There is. In addition, when the powdery and granular substances having different components are transferred and switched, for example, when the trisaccharide is transferred instead of the upper sucrose, the inside of the pressure feeding pipe 8 needs to be washed.

FIG. 4 shows an example of an apparatus for cleaning the pressure feed pipe 8. As shown in FIG. Close to both ends of the feed pipe 8 connected to the supply hopper 6 and the cyclone 10, respectively,
4 and 25, one cleaning switching valve 24 is provided with a cleaning hot water supply valve 26, and the other cleaning switching valve 25 is provided with a cleaning hot water supply valve 27 and a dissolution cleaning steam supply valve 28. is there.

Now, the hot water valve 26 is opened to feed hot water into the pressure feed pipe 8, and the cleaning water is drained from the discharge valve 28 of the switching valve 25 while cleaning the inside. Alternatively, on the contrary, the hot water valve 27 is opened, hot water for washing is sent into the pressure feed pipe 8 through the switching valve 25, and the washing water is drained through the discharge valve 30 attached to the switching valve 24.

In some cases, in order to sufficiently and completely clean the inside of the pressure feed pipe 8, the switching valve 25 is switched to send steam from the valve 28 into the pressure feed pipe 8, and the subsequent washing water may be drained from the valve 30. After the inside of the pumping tube 8 is washed as described above, only air is sent from the air compressor 9 into the pumping tube 8 to dry the inside of the pumping tube 8 and prepare for the next pumping of the particulate material. In FIG. 4, reference numeral 31 denotes a pressure sensor,
32 is an ejector.

FIGS. 5 and 6 show another embodiment of the present invention. In particular, FIG. 5 and FIG.
It is characterized in that a blowing pipe 33 is provided at a position slightly above the discharge port 11. The supply hopper 6 has an outlet 11
In the vicinity, it is funnel-shaped, and it is a part where sugar easily accumulates or adheres easily. The sugar in the vicinity of the discharge port 11 is sent out in the direction of the pressure feed pipe 8.

The center position of the blowing port 34 of the blowing pipe 33 is optimally at a height of about 1/2 h or less, preferably about 1/4 h of the total height H of the supply hopper 6. It is. Further, the blowing pipe 33 is directed tangentially to the conical inner wall surface of the supply hopper 6 and the horizontal line a.
Has an inclination angle α of 5 to 10 °.

Therefore, the supply hopper 6
If the compressed air is blown toward the outlet 11 of the supply hopper 6, the air blown into the wall surface of the supply hopper 6 generates a swirling flow and flows, and the sugar that is scattered and adheres to the wall surface flows into the swirling flow. There is no accumulation or adhesion near the discharge port 11. The compressed air for the blowing pipe 33 may be such that air sent from the air compressor 9 is branched from the supply hopper 6, the ejector 12, or the like, or sent from an independent device. It may be.

[0030]

According to the present invention described above, the powdery or highly adherent substance such as sugar, salt, titanium oxide, etc., which has been quantitatively supplied into the supply hopper 6, is pumped by compressed air. Thus, it can be transferred to the receiving tank 7 through the pressure feed pipe 8. In particular, an ejector 12 is provided between the feed pipe 8 and the supply hopper 6 so as to apply an air jet toward the direction of feeding the particulate material. It is sent continuously without stagnation, and the particulate matter does not adhere to the inside of the pressure feed pipe 8.

Also, by supplying steam to the compressed air sent from the air compressor 9 and sending the compressed air to the supply hopper 6 in a state where the compressed air is appropriately moistened, the particulate matter, especially sugar, is given a moist feeling and flavor. Good product is possible.

Further, since the inside of the pressure feeding pipe 8 can be washed between the supply hopper 6 and the receiving tank 7, the powdery and particulate matter remaining in the pressure feeding pipe 8 can be washed and discharged.
In particular, in the case of switching and transferring the particulate material having different components, by washing the inside of the pumping tube 8 in advance, the particulate material is not mixed with each other.

[Brief description of the drawings]

FIG. 1 is a front view of the entire apparatus used in the present invention.

FIG. 2 is an enlarged sectional view of an ejector provided between a supply hopper and a pressure feeding pipe.

FIG. 3 is an enlarged sectional view of a main part of the ejector viewed from a plane.

FIG. 4 is a front view showing a cleaning structure of the pressure feed pipe.

FIG. 5 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 6 is a plan view of a main part shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank of granular material 2 Quantitative supply device 3 Conveyor 4 Chute 5 Rotary valve 6 Supply hopper of granular material 7 Receiving tank of granular material 8 Pressure pipe 9 Air compressor 10 Cyclone 11 Discharge port 12 Ejector 13 Pressure section 14 Powder and granular Material flow path 15 Inner wall 16 Outer wall 17 Injection slit 18 Injection guide plate 19 Heating device 20 Jacket 21 Humidifier 22 Pressure gauge 23 Thermometer 24 Cleaning switching valve 25 Cleaning switching valve 26 Hot water supply valve for cleaning 27 Hot water for cleaning Supply valve 28 Dissolution cleaning steam supply valve 29 Discharge valve 30 Discharge valve 31 Pressure sensor 32 Ejector 33 Injection pipe 34 Injection port

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seigo Kurasaki 18-20 Nihonbashi Koami-cho, Chuo-ku, Tokyo Toyo Refining Co., Ltd. (72) Inventor Takamitsu 13-46 Daikokucho, Tsurumi-ku, Yokohama, Kanagawa Prefecture (72) Inventor Eiichi Sato 13-46 Ogurocho, Tsurumi-ku, Yokohama, Kanagawa Prefecture Inside Taiheiyo Sugar Co., Ltd. (72) Inventor Takashi Fujita 2 Yawata Kaigandori, Ichihara City, Chiba Prefecture No. 16 Shinmei Sugar Co., Ltd. (72) Inventor Takashi Sato 1-4-10, Kiyokai, Shimizu, Shizuoka Prefecture Inside Fuji Sugar Co., Ltd. (72) Inventor Houji Agatsuma 4-9, Toyosu, Koto-ku, Tokyo No. 11 Nisshin Sugar Co., Ltd. (72) Inventor Hiroshi Takeda 2-8-2 Nihonbashi Honcho, Chuo-ku, Tokyo F-term in Mitsui Sugar Co., Ltd. 3F047 AA03 AA15 AB02 CA10 CC13 DB01

Claims (6)

[Claims] When a powdery substance such as sugar, salt, titanium oxide or the like having a high adhesive property or an adhesive property is pumped by an air stream, compressed air is supplied into a supply hopper 6 for replenishing the powdery or granular substance by a fixed amount. The powder is characterized in that the powder and granular material is fed toward the receiving tank 7 through the feeding and pressure feeding pipe 8, and an air flow is jetted against the powder and granular material to be pumped, and the powder and particulate material is sucked and fed to the receiving tank 7. Pneumatic delivery of particulate matter. 2. A feed hopper 6 for replenishing powdery or granular substances such as sugar, salt, titanium oxide or the like having high or high adherence by air flow at a fixed rate, and a powdery or particulate substance. Is connected to the receiving tank 7 by a pressure feed pipe 8, and the ejector 1 provided between the supply hopper 6 and the pressure feed pipe 8 while sending compressed air into the supply hopper 6.
2. A method for pneumatically feeding a particulate material, wherein a suction jet force is given by 2 and the particulate material is pumped from a supply hopper 6 to a receiving tank 7. 3. When compressed sugar having high adhesion or adhesion is pumped by an air stream, compressed air conditioned by feeding steam is fed into a supply hopper 6 for supplying sugar by a fixed amount, and a pressure feed pipe 8 is provided. Receiving sugar through the tank 7
A method of pneumatically feeding a particulate material, comprising injecting an air stream against sugar to be pumped toward the container and sucking the sugar to pump the sugar to a receiving tank 7. 4. The method according to claim 1, wherein the inside of the pressure feed pipe 8 connecting the supply hopper 6 and the receiving tank 7 can be cleaned. 5. A supply hopper 6 for continuously supplying a particulate material at a constant rate and a receiving tank 7 for supplying the particulate material at the time of pressure-feeding the particulate material having a high adhesive property or an adhesive property by an air flow. It is connected by a pressure feed pipe 8 and feeds compressed air into the supply hopper 6 to feed the particulate matter toward the receiving tank 7, and an ejector 12 is provided between the supply hopper 6 and the pressure feed pipe 8, An apparatus for pneumatically feeding a particulate material, wherein the substance can be sucked and ejected. 6. The apparatus according to claim 5, wherein the inside of the pressure feed pipe (8) connecting the supply hopper (6) and the receiving tank (7) can be cleaned.