JP3550102B2 - Rotary feeder - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a rotary feeder having partitioning side plates at both ends of a rotor used for supplying a granular material from a low-pressure side hopper to a high-pressure side hopper or a high-pressure air transport line. And a rotary feeder capable of preventing accumulation in a space formed between a rotor side plate and a side cover of a cylindrical casing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a pressurized pneumatic transport, a rotary feeder has been used as a device for supplying a granular material to a transport pipe. 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 rotated between the adjacent blades and fall from the lower outlet to the transport pipe.
[0003]
When the rotary feeder is used as a mixing machine of a pressure-feeding pneumatic transport device, the granular material is supplied from a supply device such as a hopper to the supply port of the rotary feeder, and is accumulated between blades adjacent to the rotor. It is necessary to ensure smooth rotation of the rotor in order to drop the 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.
[0004]
Therefore, it is not possible to completely prevent the leakage of air from the high-pressure transport pipe side to the low-pressure hopper or other supply side with the rotary feeder interposed therebetween. That is, the high-pressure air on the transport pipe side flows as a leak air to the low-pressure side of the supply device such as the hopper through the gap between the casing and the blade and the gap between the cylindrical casing and the rotor side plate. 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 side plate of the rotor accompanies the leaked air from the lower portion of the rotary feeder, passing through the gap between the cylindrical casing and the rotor side plate, transported in a 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.
[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 accumulated in the space between the rotor side plate and the side cover. Sometimes. 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, the rotary feeder generates abnormal noise or generates heat. In addition, depending on the physical properties of the powder, the rotation load increases, which may cause an abnormality in the driving device.
[0007]
Conventionally, in order to solve the problem associated with the accumulation of powder carried by leaked air, high-pressure gas is blown from the blowing holes provided in the side cover of the cylindrical casing to reduce the amount of A method of promoting discharge of powder from a gap and preventing accumulation of powder in a space formed by a rotor side plate and a side cover is used.
[0008]
However, in the above-described conventional method for preventing accumulation of powder, a high-pressure gas source for purging is required, and the blown-in high-pressure gas hinders powder falling from a supply side such as a hopper. In addition, expensive equipment is required to maintain the required amount and pressure of the high-pressure gas to be blown.
[0009]
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 rotates in a cylindrical casing 5 having both side ends sealed by side covers 3. In this case, the rotary feeder 16 is configured so that the powders 14 falling from the supply device such as a hopper to the supply port 9 are rotated between the adjacent blades and fall from the lower discharge port 10 to the transport pipe. In the above, there is a configuration in which a gap lower portion 6b between the discharge port 10 and the side plate of the rotor 2 is enlarged. Further, a method of reducing the amount of intruding powder by using a method of blowing high-pressure gas from the side cover 3 is also used.
[0010]
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 will be in a lower position when the operation is stopped. It is dropped and discharged from the lower gap portion 6b to the discharge port 10 side, but accumulates in the upper portion of the space 7 during operation. Further, even when a method of blowing high-pressure gas from the side cover 3 is also used, powder is accumulated in a portion above the gas blowing hole and near the gap upper portion 6a. When the powders are compacted by the rotation of the rotor, heat generation and abnormalities of the driving device occur.
[0011]
Further, there is a rotary feeder (Japanese Utility Model Publication No. 59-11944) in which a gas exhaust hole is provided in a side cover to discharge powder that has entered along with the gas.
[0012]
However, when the above-mentioned rotary feeder is used, it is necessary to separately provide a device for treating the gas and the 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 for transporting gas and powder from the gas discharge port of the powder to the processing device may be blocked by powder accumulation due to insufficient air volume. May occur.
[0013]
[Problems to be solved by the invention]
As described above, in the conventional method for preventing accumulation of powder in a rotary feeder used for pneumatic transportation, expensive equipment is required because a high-pressure gas for purging is blown at a fixed amount and pressure. 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, part of the powder that has entered the space 7 between the side plate of the rotor and the side cover remains in the space 7. It is difficult to maintain smooth operation. Further, a rotary feeder having a gas exhaust hole in the side cover also requires a device for processing 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, clogging due to accumulation of powder may occur.
[0014]
The present invention can reliably prevent powder accumulation in the space between the rotor side plate and the side cover by a simple and inexpensive mechanism to solve the problems seen in the above-described conventional method for preventing accumulation of powder. An object of the present invention is to provide a rotary feeder having a mechanism.
[0015]
[Means for Solving the Problems]
The present inventor, in a rotary feeder used for pneumatic transport, in order to discharge the powder that has entered the space between the side plate of the rotor and the side cover without accumulation, a passage through which the powder can be discharged is provided. The present inventors have realized that if this is ensured, it is possible to easily eliminate the accumulation of powder without making a major change in the mechanism, and have completed the present invention.
[0016]
That is, the rotary feeder of the present invention is a rotary feeder that supplies powder and granules from a low-pressure supply side by a supply device such as a hopper to a high-pressure side of pneumatic transport, and supplies the powder and granules provided at the upper part of the cylindrical casing. A powder discharge groove penetrating from the inner peripheral wall of the mouth to the space between the rotor side plate and the side cover is provided.
[0017]
Further, 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]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is directed to a rotary feeder that supplies powders from a low-pressure supply side such as a hopper to a high-pressure side of pneumatic transport, in which a rotor side plate is provided from an inner peripheral wall of a supply port for powders provided at an upper part of a cylindrical casing. And the side cover are provided with a powder discharge groove penetrating therethrough, so that powder that enters along with air leaking from a gap between the cylindrical casing and the rotor side plate passes through the powder discharge groove near the supply port. Is discharged into the falling granules.
[0019]
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, the cross-sectional shape and the opening shapes of the inlet and the outlet are formed. It doesn't matter. For example, the one shown in FIG. 1 and FIG. 2 cuts out 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 the groove is formed between the rotor side plate 12 and the side cover 3. It communicates with the space 7 by an opening 13.
[0020]
As described above, by providing the powder discharge groove, the powder that enters the space between the side plate and the side cover of the rotor 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.
[0021]
Further, in the rotary feeder, when the narrowest portion of the powder discharge groove is larger than the particle diameter of the intruded powder, the lower half circumference on the high pressure side on the high pressure side is wider, and the upper half circumference on the low pressure side is narrower than the particle diameter. Even if powder with a large particle diameter enters the small-sized rotary feeder, the powder that has entered through the gap in the lower half circumference can be smoothly discharged from the powder discharge groove, thus reliably preventing powder accumulation. it can. That is, the powder entering the space formed by the rotor side plate and the side cover can be reliably discharged without accumulating under any conditions, so that the heat generated by the device caused by the accumulation of the intruding powder is generated. And operational obstacles such as the occurrence of abnormalities in the drive unit.
[0022]
【Example】
The present invention will be described with reference to FIGS. The rotary feeder 1 comprises a cylindrical casing 5 and a rotor 2 rotatably combined. The cylindrical casing 5 is formed of a cylindrical body having side covers 3 at both ends of the cylindrical body, and a supply port 9 for dropping and supplying the powder 14 from a supply device such as a hopper is provided at an upper part, and a pressure feed is provided at a lower part. An outlet 10 is provided to supply the granular material 15 to the high-pressure transport pipe side of the transport device. 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 so that both ends of a rotating shaft 11 passing through the center thereof are rotatably supported by being supported on the side cover 3 of the cylindrical casing 5 and are driven by a drive motor (not shown).
[0023]
In the rotary feeder 1, a powder discharge groove 8 is provided between the supply port 9 of the cylindrical casing 5 and the outer periphery of the side plate 12 on both sides of the rotor 2. The opening 13 is formed in the powder discharge groove 8 in the space 7 between the side plate 12 of the rotor 2 and the side cover 3 of the cylindrical casing 5, and the space 7 and the supply port 9 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.
[0024]
The rotary feeder 1 is assembled by, for example, joining the supply port 9 to a hopper and the discharge port 10 to a high-pressure transport pipe of a pressure-feed transport apparatus. Then, the operation of the rotor is started via the drive motor, 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.
[0025]
During the above operation, part of the high-pressure air on the high-pressure transport pipe side flows to the discharge port 10, and leaks from the lower part 6 b of the gap between the discharge port 10 of the cylindrical casing 5 and the side plate 12 of the rotor 2, forming air leaking from the rotor 2. It enters the space 7 between the side plate 12 and the side cover 3 of the cylindrical casing 5. 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 intruded powder is discharged from the upper part of the gap 6a into the supply port 10 along with the leaked air, but the powder having a larger particle diameter than the gap of the upper part of the gap 6a passes through the powder discharge groove 8 through the opening 13. It is discharged into the supply port 10.
[0026]
Further, when the difference between the low pressure supply port side pressure and the high pressure transport pipe side pressure 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 The upper gap 6a on the side of the opening 9 is narrower, the lower gap 6b on the high-pressure transport pipe side is wider, and a large amount of powder is mixed from the widened lower gap 6b. Penetrates into a space 7 between the side casing 3 of the tubular casing 5. At this time, although the gap upper part 6a on the supply port 9 side is narrow, the powder discharge groove 8 is present, so that powder having a large particle size can easily pass through the powder discharge groove 8 from the opening 13. It can be discharged into. 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]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the rotary feeder of this invention, in any driving | running state, in the space between the side plate of a rotor and the side cover of a cylindrical casing, the powder granulated without accumulating Since the powder can be discharged to the supply port side of the body, the supply of the granular material to the pressure-feeding type pneumatic transport device can always be efficiently performed.
[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 view showing an example of a conventional rotary feeder in a longitudinal section.
[Explanation 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 Rotating shaft 12 Side plate 13 Openings 14, 15

Claims (2)

In a rotary feeder having partitioning side plates at both ends of the rotor, penetrates from the inner peripheral wall of the supply port of the granular material provided at the top of the cylindrical casing to the space formed between the rotor side plate and the side cover of the cylindrical casing. A rotary feeder characterized in that a powder discharge groove is provided. 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.

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