JP2006273476A - Rotary feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotary feeder capable of preventing a lock phenomenon in which foreign matter is caught between a rotor and a casing and reducing damage of the rotor and casing due to lock, and at the same time to reduce the number of processes of processing components to easily and more inexpensively manufacture the rotor. <P>SOLUTION: In this rotary feeder, inflow and outflow ports are provided on the upper and lower sides of the casing storing the rotor with a plurality of rotor blades 22, and powdery and granular materials taken inside the casing from the inflow port are sent out to the outflow port in accordance with rotation of the rotor. Coating parts 40 coated with synthetic resin or rubber are formed on the overall surface of the rotor, and machining parts 41 obtained by machining tip outer peripheral parts of the coated rotor blades 22 into predetermined dimensions partially leaving a coating layer are provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary feeder, and more particularly to a rotary feeder suitable for use in transferring various types of granular materials.

In Patent Document 1 below, a synthetic resin is lined inside the casing, and a sliding plate portion having a L-shaped cross section made of a nonmetallic material such as synthetic resin or rubber is provided on the outer periphery of the rotor blade. There is a description of a rotary feeder that can prevent a locking phenomenon caused by foreign matter between the rotor and the casing, suppress damage to the casing and rotor blades, and improve durability.
Japanese Patent No. 3247090

  According to the rotary feeder described in Patent Document 1, since a synthetic resin lining and a sliding contact plate are provided on both the casing and the rotor side, many processing steps and processing steps are required, and the cost is low. There is a problem that increases. In addition, it is necessary to adjust the sliding resistance between the rotor and the casing in a well-balanced manner over the entire circumference so as not to cause pulsation when the rotor rotates. For this purpose, clearance or rubbing between the rotor and the casing is required. Therefore, there is a problem that in manufacturing the rotary feeder, it is necessary to strictly control the processing accuracy and assembly accuracy of the parts.

  Further, in order to prevent the locking phenomenon described above, it is possible to prevent the adherence of powder particles that contribute to foreign object biting to the rotor, in particular, to prevent the powder particles from adhering to the rotor blade tips. It is effective. In addition, by eliminating adhesion of the powder particles to the rotor surface, the powder particles can be easily discharged out of the rotary feeder. This is because the manufacturing method of the rotor is generally performed by casting, and the surface thereof is a rough casting skin, and the powder particles may adhere to the casting skin and exhibit various bad behaviors, for example, It may cause factors that cause biting and the like, and may cause a phenomenon that powder particles are stuck in a pocket partitioned by a rotor blade and a rotor side plate and are not discharged. That is, by smoothing the rotor, it becomes difficult for the particles to adhere to the rotor surface, and as a result, the problem of the locking phenomenon can be solved and the particles can be discharged smoothly. .

  Therefore, the technical problem of the present invention is to prevent the occurrence of a locking phenomenon in which foreign matter is caught between the rotor and the casing, and to reduce damage to the rotor and the casing caused by the locking as much as possible. Another object of the present invention is to provide a rotary feeder that makes it possible to manufacture a rotor more easily and at a lower cost by devising a part processing or manufacturing process.

(1) In order to solve the above technical problem, the invention according to claim 1 of the present invention is provided with an inlet and an outlet on the upper and lower sides of a casing containing a rotor having a plurality of rotor blades, A rotary feeder configured to send the granular material taken into the casing from the inlet in accordance with rotation to the outlet, and the entire surface of the rotor is coated with synthetic resin or rubber and coated. It is characterized in that a machined part is provided that is machined (cut or polished) to a predetermined dimension, leaving a part of the coating layer on the outer periphery of the tip of the rotor blade.

(2) Further, the invention according to claim 2 of the present invention is a rotor equipped with a rotor shaft, wherein the entire surface of the rotor portion excluding the rotor shaft is coated with synthetic resin or rubber, and the rotor shaft is It is characterized in that a machined portion subjected to machining (cutting or polishing) is provided on the outer periphery of the tip of the rotor blade as a reference.

(3) The invention according to claim 3 of the present invention is characterized in that the coating portion is urethane rubber and the hardness thereof is 97 A or more.

(4) Furthermore, the invention according to claim 4 of the present invention is characterized in that it is configured to be applied to plug transportation of a high-pressure granular material having a transportation pressure of 80 kPa or more.

  According to the means described in the above (1), the entire surface of the rotor is coated with synthetic resin or rubber, and the tip outer periphery of the rotor blade is machined while leaving a part of the coating layer. On the other hand, it is possible to maintain accurate clearance continuously and prevent the transportation air due to the difference in transportation pressure from leaking out of the path, and even if foreign matter is caught between the casings, the synthetic resin at the outer peripheral tip of the rotor blades In addition, by using rubber, it is possible to avoid the lock and to prevent a serious fatal damage to the rotor and the casing by the cushioning effect of synthetic resin or rubber.

  Further, according to the means described in the above (1), since the entire rotor is coated on the surface, the surface is smooth and the powder particles are hardly attached to the surface of the rotor. As a result, the risk that the adhered granular material stays at the tip of the rotor blade and causes biting with the casing is reduced. At the same time, the granular material is easily separated from the rotor due to the coating effect of the rotor, so that the granular material can be reliably discharged at the discharge port.

  Furthermore, according to the means described in the above (1), since the same effect can be exhibited without providing a sliding contact portion as described in the above document, it is possible to suppress the component cost and the assembly cost. .

  According to the means described in (2) above, since the rotor shaft is mounted on the rotor in advance and the outer periphery of the rotor blade is processed with reference to the rotor shaft, the accumulated error can be eliminated as compared with the case where it is assembled later. The clearance with the casing can be maintained with higher accuracy.

  According to the means described in the above (3), since urethane rubber having a hardness of 97A or more is used as the coating portion, an excellent biting prevention and cushioning effect can be exhibited, and an effect of improving the processing accuracy can be obtained.

  According to the means described in the above (4), it is used for plug transportation of a granular material that is transported at a high pressure of 80 kPa or more, and a more excellent effect can be exhibited.

  As described above, according to the rotary feeder according to the present invention, it is possible to prevent the occurrence of a lock phenomenon due to the inclusion of foreign matter between the rotor and the casing, and to prevent damage to the rotor and the casing based on the occurrence of the lock phenomenon. An advantage that a highly safe rotary feeder can be provided at a relatively low cost can be exhibited.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a rotary feeder according to the invention will be described with reference to the accompanying drawings. FIGS. 1 to 3 are general views of a rotary feeder 10 showing an embodiment of the invention. 1 is a front sectional view, FIG. 2 is a side view, and FIG. 3 is a plan view.

  As will be described later, the rotary feeder 10 is configured to be driven by receiving a rotational output of a motor transmitted via a chain and a gear. The casing has an inlet and an outlet formed integrally with the casing at respective upper and lower positions, a rotor space is provided in the central space, and a rotor having a plurality of radial rotor blades on a rotating shaft is provided. It is configured so as to be rotated in the horizontal direction and sent out from the inflow port to the outflow port. The above rotor is attached integrally with a disk-shaped rotor side plate so as to close both ends of a plurality of rotor blades, and both ends thereof are attached to the left and right ends of the casing by detachable screws. It is supported by a bearing provided in the.

  As shown in FIG. 1, the casing 11 has a configuration in which a rotor chamber 13, which is a horizontal cylindrical cavity, is provided inside a casing body 12 that is a hollow in the vertical direction. An inlet 14 and an outlet 15 are formed. In the rotor chamber 13 of the casing body 12, a rotor 19 attached to the rotating shaft 17 by a taper pin 21 is inserted.

  A plurality of rotor blades 22 are radially attached between the disk-like side plates 20 of the rotor 19. A staffin box 16 is attached to the side wall of the casing body 12 by bolts 23, and both ends of the rotating shaft 17 are inserted through the staffin box 16, and the staffin box 16, the gland packing 18, the packing presser 28, The bearing 24 is rotatably supported. A drive sprocket 25 that is driven via a chain 27 is attached to one end of the rotating shaft 17 by a parallel key 26.

  2 and 3, reference numeral 30 denotes a drive unit. The drive unit 30 includes a motor base 31, a geared motor 32, and a motor sprocket 34 attached to a drive shaft 33 of the geared motor 32. Further, one end side of the above-described chain 27 is suspended over the motor sprocket 34. Reference numeral 35 denotes a chain cover.

  FIGS. 4 and 5 show the assembled state of the rotor 19 described above. As shown in FIG. 4, except for the rotating shaft 17, a coating portion 40 made of synthetic resin or rubber is provided on the entire surface of the rotor 19. It has been. Further, as shown in FIG. 5, the outer peripheral portion of the rotor blade 22 is provided with a machining portion 41 by cutting or polishing with a part of the coating layer left, and the outer diameter of the rotor 19 is set to the casing inner diameter. And can be rotated while maintaining a slight clearance.

  Regarding the outer periphery processing of the rotor blades 22, it is desirable to assemble the rotary shaft 17 and the coated rotor 19 in advance, and machine the outer periphery of the rotor blade 22 based on the rotation shaft 17. Thereby, the core of the outer periphery of the rotor blade 22 with respect to the rotating shaft 17 can be accurately aligned. After assembling the rotor 19 and the rotating shaft 17, the rotor 19 may be coated, and then the outer periphery of the rotor blade 22 may be machined based on the rotating shaft 17.

  When the above-mentioned coating is urethane rubber, for example, a hard urethane coating (trade name CD9100) having a hardness of 97A or more is used, and as a result, it is applied to plug transportation of a high-pressure granular material having a transportation pressure of 80 kPa or more. be able to. In addition, when the hard urethane coating is used, the roundness of the outer diameter of the rotor 19 can be increased to about 10 μm, so that the rotor 19 can be precisely machined.

  6 to 9 show the structure of the casing 11, FIG. 6 is a front view of the casing, FIG. 7 is a plan view, FIG. 8 is a side view, and FIG. 9 is a sectional view taken along line ZZ in FIG. The portion in which the rotor is accommodated is machined with high accuracy so that the clearance with the rotor is appropriate. 6, 28a is a screw hole used for mounting the motor base 31 shown in FIG. 1, and 43a in FIG. 7 and FIG. 3 described above is a screw hole for mounting the duct.

  According to the rotary feeder 10 having the above-described configuration, the granular material flowing in from the inlet 14 of the casing 11 is sent toward the outlet 15 according to the rotation of the rotor 19. Since the entire surface is coated with synthetic resin or rubber, it is difficult for powder particles to adhere to the surface of the rotor 19, and in particular, an abnormal behavior near the tip of the rotor blade 22 hardly occurs. As a result, biting and locking between the casing 11 and the casing 11 are reduced.

  Further, even when biting or locking occurs, these phenomena can be safely avoided by the elasticity of the rubber, so that it does not fall into the locked state, and decisive damage is not given to the rotor blade 22 or the casing 11. Further, conventionally, because the rotor 19 is made of a casting, the rotor surface may be a so-called casting skin and cannot be removed with the powder particles attached. As a result, apart from the above-mentioned adhesion problem, there was also a phenomenon in which the granular material was not discharged at the discharge port and the granular material stayed, but such a phenomenon can also be prevented by applying a coating. .

  In addition, in the biting test of the metal piece, it was confirmed that the quality improvement was innovative compared with the conventional metal-metal rotary feeder. That is, in the conventional rotary feeder, the metal piece is dragged between the casing and the rotor just by mixing the metal piece inside, and the inner surface of the casing is deeply scratched. The above-described locking phenomenon has occurred that causes the clearance with the rotor to be crushed and results in malfunction.

  However, according to the rotary feeder according to the present invention that has been subjected to the above-described coating treatment, it is possible to stably operate by avoiding the occurrence of a phenomenon that the metal piece is cut into the urethane layer side where the metal piece is coated or scraped and locked. I was able to confirm. Further, the rotational torque at this time was also stable, and almost no load was observed.

  Furthermore, since the conventional rotary feeder is based on a combination of components, in order to increase the processing accuracy of the entire rotor, it is necessary to improve the assembly accuracy as well as the processing accuracy of each component. This was very difficult. When components are combined, the error of each component becomes an integration error, resulting in a very large error, but the present invention can also solve this integration error problem.

The front sectional view of the rotary feeder in an embodiment of the invention. The side view of the rotary feeder in embodiment of this invention. The top view of the rotary feeder in embodiment of this invention. Sectional drawing of the principal part in embodiment of this invention. AA line sectional view of Drawing 4. The front view which made a part of casing of the rotary feeder by embodiment of this invention a cross section. The top view of the casing of the rotary feeder by embodiment of this invention. The side view of the casing of the rotary feeder by embodiment of this invention. ZZ sectional drawing of FIG.

Explanation of symbols

10 ... Rotary feeder
11 ... Casing
12 ... Casing body
13 ... Rotor chamber
14 ... Inlet
15 ... Outlet
16 ... Staffin box
17 ... Rotating shaft
18 ... Grand packing
19 ... Rotor
20 ... rotor side plate
22 ... Rotor blade
24 ... Bearing
25 ... Drive sprocket
27 ... Chain
32 ... Geared motor
34 ... Motor sprocket
40 ... Coating part
41 ... Machining part

Claims (4)

A rotary feeder configured to provide an inlet and an outlet at the top and bottom of a casing containing a rotor having a plurality of blades, and to send out the particulate matter taken into the casing from the inlet according to the rotation of the rotor. There,
A machine by cutting or polishing to a predetermined size while forming a coating portion formed by coating synthetic resin or rubber on the entire surface of the rotor and leaving a coating layer on the outer peripheral portion of the tip of the coated rotor blade A rotary feeder, characterized in that a machined portion subjected to machining is provided.   A rotor equipped with a rotor shaft, in which the entire surface of the rotor portion excluding the rotor shaft is coated with a synthetic resin or rubber, and the outer peripheral edge of the rotor blade with respect to the rotor shaft is machined by cutting or polishing The rotary feeder according to claim 1, further comprising a machined portion subjected to machining.   The rotary feeder according to claim 1 or 2, wherein the coating portion is urethane rubber and has a hardness of 97A or more.   The rotary feeder according to claim 1, 2 or 3, wherein the rotary feeder is configured to be applied to plug transportation of a high-pressure granular material having a transportation pressure of 80 kPa or more.

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