JP2002284347A - Rotary feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary feeder used for force-feeding type pneumatic transportation capable of preventing powder bodies carried by leak air from accumulating in a space between a side plate of a rotor and a side cover of a cylindrical casing. SOLUTION: In this rotary feeder 1 for supplying powder bodies 14 from a lower pressure supply side of a supply device such as a hopper to a higher pressure side of the force-feeding type pneumatic transportation, a powder body exhaust groove 8 is provided between an inner peripheral wall of a powder body supply port 9 provided on an upper part of the cylindrical casing 5 and an outer peripheral surface of both side plates 12 of the rotor. The powder exhaust groove 8 is formed so that its narrowest part is larger than a particle diameter of the powder intruding into the space 7 between the side plate 12 of the rotor and the side cover 3 of the cylindrical casing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary feeder having a partition side plate at both ends of a rotor used when supplying powdery material from a low pressure side hopper to a high pressure side hopper or a high pressure air transport line. The present invention relates to a rotary feeder which can prevent powder conveyed by a rotary shaft from accumulating in a space formed between a rotor side plate and a side cover of a cylindrical casing.

[0002]

2. Description of the Related Art Conventionally, a rotary feeder has been used as a device for supplying a granular material to a transport pipe in, for example, pneumatic transport. This rotary feeder is provided with a supply device such as a hopper when a rotor having a plurality of rotating blades radially provided and side plates provided on both side surfaces rotates in a cylindrical casing whose both ends are sealed by side covers. It is configured such that the powders and particles falling to the mouth are accumulated between the adjacent blades, and fall from the lower outlet to the transport pipe.

When the above-mentioned rotary feeder is used as a mixing machine of a pneumatic conveying device, powders are supplied from a supply device such as a hopper to a supply port of the rotary feeder, and are supplied to a blade between adjacent blades of the rotor. It is necessary to ensure smooth rotation of the rotor in order to drop the accumulated powder to the transport pipe side. Therefore, a certain gap is provided between the cylindrical casing and the blades and the side plates of the rotor.

Therefore, it is not possible to completely prevent the generation of air leaking from the high-pressure transport pipe side to the low-pressure hopper or the like with the rotary feeder interposed therebetween. That is, the high-pressure air on the transport pipe side flows through the gap between the casing and the blade and the gap between the cylindrical casing and the rotor side plate as leakage air to the low-pressure side of a supply device such as a hopper. In particular, during operation of the rotary feeder, if the pressure difference between the high-pressure transport pipe side and the low-pressure supply side is large and an excessive lifting force acts on the rotor, the cylindrical casing and the side plate of the rotor The upper half circumference on the low pressure side is narrow and the lower half circumference on the high pressure side is wide.

[0005] By the operation of the rotary feeder, powder having a particle size smaller than the gap between the cylindrical casing and the rotor side plate accompanies the air leaking from the lower portion of the rotary feeder to the gap between the cylindrical casing and the rotor side plate. Then, it is carried to a space formed between the rotor side plate and the side cover of the cylindrical casing (hereinafter, abbreviated as a space between the loader side plate and the side cover). The powder refers to particles that can enter the space between the rotor side plate and the side cover through a gap between the cylindrical casing such as a fibrous material such as cotton or a thin film-shaped chip and the rotor side plate.

[0006] In the case of fine powder, a plurality of particles may form a group due to agglomeration, so that it is difficult for the intruded powder to be discharged from the gap in the upper half circumference, and the space between the rotor side plate and the side cover. May accumulate. In particular, when the pressure difference between the high-pressure transport pipe side and the low-pressure supply side is large and the rotor is pushed up, the gap between the cylindrical casing and the rotor side plate has an upper half circumference on the low-pressure side. It is narrow, the lower half circumference on the high pressure side becomes wider, and the powder entering the space includes those having a particle diameter larger than the upper half circumference gap, so that the possibility of accumulation is high. When the accumulated powder is compacted, an abnormal noise is generated or heat is generated from the rotary feeder. In addition, depending on the physical properties of the powder, the rotation load increases, which may cause an abnormality in the driving device.

Conventionally, in order to solve the problem associated with the accumulation of powder carried by leaked air, high-pressure gas is blown from a blowing hole provided in a side cover of a tubular casing to reduce the amount of powder that has entered and simultaneously. A method of promoting powder discharge from the upper half circumferential gap and preventing powder accumulation in a space formed by the rotor side plate and the side cover is used.

However, the above-mentioned conventional method for preventing accumulation of powder requires a high-pressure gas source for purging, and the blown-in high-pressure gas hinders powder from falling from a supply side such as a hopper. In addition, the amount and pressure of
Expensive equipment is required to keep the required amount.

Further, as shown in FIG. 3, a rotor 2 having a plurality of rotating blades 4 provided radially and side plates 12 provided on both side surfaces is provided in a cylindrical casing 5 in which both side ends are sealed by side covers 3. When rotating in the inside, the granular material 14 falling from a supply device such as a hopper to the supply port 9 is rotated between the adjacent blades, and is dropped from the lower discharge port 10 to the transport pipe. There is a rotary feeder 16 in which a gap lower portion 6b between the discharge port 10 and the side plate of the rotor 2 is expanded. Further, there is also used a method in which a high pressure gas is blown from the side cover 3 to reduce the amount of intruding powder.

However, in this case, since the upper gap 6a between the supply port 9 and the rotor side plate 12 is narrow, the powder that has entered the space 7 between the rotor side plate 12 and the side cover 3 is
When the operation is stopped, the outlet 1
It is dropped and discharged to the 0 side, but accumulates in the upper part of the space 7 during operation. Further, even when a method of blowing high-pressure gas from the side cover 3 is also used, the powder accumulates in a portion above the gas blowing hole and near the gap upper portion 6a. When the powder is compacted by the rotation of the rotor, heat generation and abnormality of the driving device occur.

Further, a gas exhaust hole is provided in the side cover,
There is also a rotary feeder (Japanese Utility Model Publication No. 59-11944) for discharging powder that has entered along with gas.

However, when the above-mentioned rotary feeder is used, it is necessary to separately provide a device for treating gas and powder discharged from the gas discharge holes of the side cover. In addition, since the amount of leaked air also fluctuates with changes in operating conditions, the pipes that convey gas and powder from the gas discharge port of the powder to the processing equipment are blocked by powder accumulation due to insufficient air volume. May occur.

[0013]

As described above, in the conventional method for preventing the accumulation of powder in a rotary feeder used for pneumatic transportation of a pressurized type, expensive equipment is required because a high pressure gas for purging is blown at a constant amount and pressure. It is. Also, in the rotary feeder 16 in which the lower gap 6b between the discharge port 10 and the side plate of the rotor 2 is widened, a part of the powder that has entered the space 7 between the side plate of the rotor and the side cover is also in the space 7.
And it is difficult to maintain smooth operation.
In addition, a rotary feeder having a gas exhaust hole in the side cover requires a device for treating gas and powder, and a pipe for transporting gas and powder from the gas exhaust hole to the processing device during operation. In this case, blockage due to accumulation of powder may occur.

The present invention solves the problems seen in the above-mentioned conventional method for preventing the accumulation of powder, etc., by using a simple and inexpensive mechanism to reliably prevent the accumulation of powder in the space between the rotor side plate and the side cover. An object of the present invention is to provide a rotary feeder having a mechanism capable of preventing the rotation.

[0015]

SUMMARY OF THE INVENTION The present inventor has proposed a rotary feeder for use in pneumatic transportation, in which powder entering a space between a side plate of a rotor and a side cover is discharged without being accumulated. As long as there is a passage through which the powder can be discharged,
The present inventors have realized that the accumulation of powder can be easily eliminated, and have completed the present invention.

That is, the rotary feeder according to the present invention is a rotary feeder for supplying powders and granules from a low pressure supply side by a supply device such as a hopper to a high pressure side of a pneumatic transport of a pressurized type. A powder discharge groove penetrating from the inner peripheral wall of the body supply port to the space between the rotor side plate and the side cover is provided.

The powder discharge groove in the rotary feeder is characterized in that the narrowest part of the powder discharge groove is larger than the particle diameter of the powder entering the space between the side plate and the side cover of the rotor.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a rotary feeder for supplying powders from a low pressure supply side, such as a hopper, to a high pressure side of a pneumatic transport, which is provided at an upper portion of a cylindrical casing. Since the powder discharge groove penetrating from the inner peripheral wall of the rotor to the space between the rotor side plate and the side cover is provided, the powder entering along with the leaked air entering from the gap between the cylindrical casing and the rotor side plate is the powder described above. The powder is discharged into the powder particles falling near the supply port through the body discharge groove.

If the powder discharge groove penetrates from the inner peripheral wall of the supply port of the granular material provided in the upper part of the cylindrical casing to the space between the rotor side plate and the side cover, its cross-sectional shape and the inlet and outlet are formed. The shape of the opening does not matter. For example, the one shown in FIGS. 1 and 2 cuts off a part of the inner peripheral wall of the supply port 9 of the cylindrical casing 5 to form a powder discharge groove 8, and this groove forms It communicates with the space 7 by the opening 13.

As described above, by providing the powder discharge groove, powder that enters the space between the side plate of the rotor and the side cover is easily discharged, so that the accumulation phenomenon does not easily occur. This has the effect of reducing operational obstacles such as heat generation of the device and occurrence of abnormalities in the drive device.

In the above rotary feeder,
If the narrowest part of the powder discharge groove is made larger than the particle diameter of the intruded powder, the lower half of the high pressure side on the high pressure side is wider, the upper half of the low pressure side is narrower, and the rotary feeder assembled smaller than the particle diameter In this case, even if powder having a large particle diameter enters, the powder that has entered through the gap in the lower half circumference can be smoothly discharged from the powder discharge groove, so that powder accumulation can be reliably prevented. That is, the powder entering the space formed by the rotor side plate and the side cover can be reliably discharged without being accumulated under any conditions, so that the heat generated by the device caused by the accumulation of the entered powder can be ensured. And operational obstacles such as the occurrence of abnormalities in the drive unit.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS.
The rotary feeder 1 includes a cylindrical casing 5 and a rotor 2.
Are rotatably combined. The above cylindrical casing 5
Consists of a cylindrical body having side covers 3 at both ends of the cylindrical body, a supply port 9 for dropping and supplying the powder 14 from a supply device such as a hopper is provided at an upper portion, and a high pressure of a pressure feeding type transport device is provided at a lower portion. Outlet 1 for dropping and supplying powder 15 to the transport pipe side
0 is provided. On the other hand, the rotor 2 has a plurality of rotating blades 4 arranged radially and side plates 12 provided on both side surfaces. The rotor 2 is configured to be rotatably combined with both ends of a rotating shaft 11 penetrating the center thereof by being rotatably supported on the side cover 3 of the cylindrical casing 5 and to be driven by a drive motor (not shown).

In the rotary feeder 1, the supply port 9 of the cylindrical casing 5 and the side plates 12 on both sides of the rotor 2 are provided.
And a powder discharge groove 8 is provided between the outer periphery of the powder. The opening 13 is formed in the powder discharge groove 8 on the space 7 side between the side plate 12 of the rotor 2 and the side cover 3 of the cylindrical casing 5.
Side and the supply port 9 side communicate with each other. Also, the narrowest portion of the groove 8 is formed larger than the particle diameter of the powder. Therefore, it is configured such that powder having a large particle diameter can be smoothly discharged under any conditions.

The rotary feeder 1 is assembled by, for example, connecting the supply port 9 to the hopper and connecting the discharge port 10 to the high-pressure transport pipe of the pressure transport apparatus. Then, the operation of the rotor is started via the drive motor, and the powder 14 is dropped and supplied from the hopper at atmospheric pressure to the supply port 9, and the powder accumulated in each rotor pocket formed by the adjacent rotating blades 4. The granules are sequentially dropped and supplied from the discharge port 10 to the high-pressure transport pipe by the rotation of the rotor 2.

During the above operation, part of the high-pressure air on the high-pressure transport pipe side flows to the discharge port 10 and the discharge port 1 of the cylindrical casing 5
Air leaks from the lower part 6b of the gap between the cylinder 0 and the side plate 12 of the rotor 2 and enters the space 7 between the side plate 12 of the rotor 2 and the side cover 3 of the tubular casing 5 as leaked air. The leaked air that has entered is discharged into the supply port 10 from the upper portion 6a of the gap between the supply port 10 of the cylindrical casing 5 and the side plate 12 of the rotor 2. The powder is conveyed by the leaked air and enters the space 7. The penetrated powder is accompanied by the leaked air and the upper part of the gap 6a
The powder having a larger particle diameter than the gap at the upper portion 6 a of the gap is discharged into the supply port 10 through the powder discharge groove 8 from the opening 13.

When the difference between the pressure on the low-pressure supply port side and the pressure on the high-pressure transport pipe side is large and the rotor 2 is pushed up to the supply port 9 side, the gap between the cylindrical casing 5 and the side plate 12 of the rotor 2 is increased. The upper portion 6a of the gap on the supply port 9 side is narrow, the lower portion 6b of the gap on the high-pressure transport pipe side is widened, and a large amount of powder is mixed from the widened lower portion 6b of the rotor 2 as well. It invades the space 7 between 12 and the side cover 3 of the cylindrical casing 5. At this time, although the upper gap 6a on the supply port 9 side is narrow, the powder discharge groove 8
, Powder having a large particle diameter can be easily discharged into the supply port 9 from the opening 13 through the powder discharge groove 8. Therefore, in any operation state, the powder that has entered the space 7 can be reliably discharged together with the leaked air, and an operation obstacle due to the accumulation of the powder that has entered the space 7 can be eliminated.

[0027]

According to the rotary feeder of the present invention,
In any operation state, in the space between the side plate of the rotor and the side cover of the cylindrical casing, the powder conveyed with the leaked air can be discharged to the supply port side of the granular material without being accumulated. In addition, it is possible to always efficiently supply the granular material to the pneumatic transportation device.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a vertical section of a rotary feeder according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of FIG.

FIG. 3 is an explanatory diagram showing an example of a conventional rotary feeder in a longitudinal section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 16 Rotary feeder 2 Rotor 3 Side cover 4 Rotating blade 5 Cylindrical casing 6a Upper gap 6b Lower gap 7 Space 8 Powder discharge groove 9 Supply port 10 Discharge port 11 Rotary shaft 12 Side plate 13 Opening 14, 15

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[Procedure amendment]

[Submission date] April 5, 2002 (2002.4.5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005] By the operation of the rotary feeder, powder having a particle size smaller than the gap between the cylindrical casing and the rotor side plate accompanies the air leaking from the lower portion of the rotary feeder to the gap between the cylindrical casing and the rotor side plate. through it, it is conveyed to the space formed between the side cover of the rotor plate and the tubular casing (hereinafter referred to as space between rotors side plate and the side cover). The powder refers to particles that can enter the space between the rotor side plate and the side cover through a gap between the cylindrical casing such as a fibrous material such as cotton or a thin film-shaped chip and the rotor side plate.

Claims (2)

[Claims] 1. A rotary feeder having partition side plates at both ends of a rotor, wherein the rotary feeder is formed between an inner peripheral wall of a powdery material supply port provided at an upper part of a cylindrical casing and a rotor side plate and a side cover of the cylindrical casing. A rotary feeder characterized by having a powder discharge groove penetrating to a space to be formed. 2. The rotary feeder according to claim 1, wherein the narrowest part of the powder discharge groove is larger than the particle diameter of the powder entering the space between the rotor side plate and the side cover of the cylindrical casing.