JP2004115133A - Rotary feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically adjust a clearance between a tip of a blade of a rotor and an inner wall of a casing by a simple structure without using a mechanical/electrical means. <P>SOLUTION: In this taper type rotary feeder, holes 13 of a rotor 12 are constituted with a small diameter and a large diameter. An indentation and projection part 23 slidably contacting a spline or feather key 22 at an outer peripheral portion of a rotary shaft 10 is formed on an inner peripheral face of a small diameter hole part 19. A cylinder 24 made of a metallic material or plastic material with higher linear expansion coefficient than that of the metallic material forming the rotor 12 is inserted in an annular sectioned clearance 25. A stopper member 26 and a receiving member 29 are installed to the rotary shaft 10, and an elastic body 31 is shrinkably installed between the receiving member 29 and a front end of the rotor 12. When the rotor 12 is in a high temperature, the cylinder 24 extends to move the rotor 12 forwards, so that a clearance between a tip 17 of a blade 15 and a casing can be automatically adjusted. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary feeder, particularly to a rotary feeder provided with a tapered rotor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various kinds of granular materials, incinerated ash, dust, grains, and other granular materials have been quantitatively supplied to a discharge port regardless of fluctuations in the input amount from a supply port, and other processes such as bagging can be smoothly performed. A so-called rotary feeder is used for this purpose. In this rotary feeder, in order to prevent galling between the tip of the rotor blade and the inner wall surface of the casing due to thermal expansion when handling high-temperature granular materials, the tip of the blade and the inner periphery of the casing are prevented. It has been proposed to provide a taper on the wall surface, adjust the clearance between the two by moving the rotor in the axial direction according to the degree of expansion, and achieve both the maintenance of a pressure difference between the inside and the outside and the smooth driving of the rotor.
[0003]
In the above-described tapered rotary feeder, as a means for adjusting the clearance, by manually turning the handle to move the rotor back and forth, or by detecting the temperature and the like in the rotary feeder and driving the forward and backward movement device. One that moves the rotor (see Japanese Patent Application Laid-Open No. 9-14469) and the like are introduced.
[0004]
However, it is troublesome and difficult to properly adjust the clearance by moving the rotor back and forth by manual operation, and moving and moving the rotor back and forth using mechanical or / and electrical means has a complicated structure, There is a disadvantage that the manufacturing cost increases.
[0005]
The present invention has been made in view of the inconveniences and disadvantages of the conventional tapered rotary feeder as described above, and has a simple structure without using mechanical and electrical means. To provide an inexpensive rotary feeder for automatically adjusting the clearance between the casing and the inner wall of the casing.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a rotary feeder according to the present invention is provided with a tapered type in which a plurality of blades forming a plurality of pockets are inclined in a casing having a supply port and a discharge port toward a rear side of the casing. In a tapered rotary feeder having a structure in which the rotor is accommodated so as to be movable in the axial direction of the rotation shaft, a portion of the rotor hole passing through the rotation shaft extends rearward from a front end thereof over a predetermined length. An outer peripheral portion of the rotary shaft, which has a small diameter and has a large diameter from a rear end of the small-diameter hole portion to a rear end of the rotor hole, and is opposed to the inner peripheral surface of the small-diameter hole portion. The rotor is formed in an annular gap in cross-section between the inner peripheral surface of the large-diameter hole portion of the rotor hole and the outer peripheral surface of the rotary shaft, by forming an uneven portion that is in sliding contact with a spline or a feather key provided in the rotor hole. A cylinder made of a metal material or a plastic material having a higher linear expansion coefficient than the metal material to be formed is inserted with its front end in contact with an annular step formed at the front end of the large-diameter hole. In addition, a stopper member for regulating rearward movement of the rotor and the cylinder is provided at a shaft portion of the rotating shaft at a rear end of the rotor hole, and a stopper member is provided forward from a front end of the rotor hole. An elastic receiving member is provided on the shaft portion of the rotating shaft at an interval between the receiving member and the front end of the rotor. When the rotor is heated to a high temperature, the cylinder is stretched by thermal expansion because of a higher linear expansion coefficient than the rotor, and the rotor is elastically deformed. Anti to move forward, it is characterized in that the clearance between the tip and the casing of the vane was automatically adjustable.
[0007]
Further, the rotary feeder according to the present invention rotates a tapered rotor having a plurality of blades forming a plurality of pockets in a casing having a supply port and a discharge port, inclined toward the rear of the casing. In a tapered rotary feeder having a structure accommodated movably in the axial direction of the shaft, a portion extending a predetermined length from the front end to the rear of the hole of the rotor through which the rotary shaft is inserted has a small diameter, A portion extending from the rear end of the small-diameter hole portion to the rear end of the rotor hole has a large diameter, and a spline or an spline provided on an inner peripheral surface of the small-diameter hole portion on an outer peripheral portion of the rotating shaft facing the inner peripheral surface. An uneven portion that is in sliding contact with the feather key is formed, an annular gap in cross section between the inner peripheral surface of the large-diameter hole portion of the rotor hole and the outer peripheral surface of the rotary shaft and forward from the front end of the large-diameter hole portion. Predetermined A cylinder made of a metal material or a plastic material having a higher linear expansion coefficient than a metal material forming the rotor in a groove having a circular cross section formed in a length thereof has a front end corresponding to a front end of the annular groove. While being inserted in a contacted manner, a stopper member for regulating the rearward movement of the rotor and the cylinder is provided on the shaft portion of the rotating shaft at the rear end of the rotor hole, An elastic receiving member is provided on a shaft portion of the rotating shaft spaced a predetermined distance forward from a front end of the rotor hole, and the rotor is provided between the receiving member and a front end of the rotor. An elastic body for elastically displacing rearwardly with the cylinder is compressed, and when the rotor becomes hot, the cylinder has a higher linear expansion coefficient than the rotor, so that the cylinder is stretched by thermal expansion. , Is moved forward against the rotor to the elasticity of the elastic body, it is characterized in that the clearance between the tip and the casing of the vane was automatically adjustable.
[0008]
Further, in the rotary feeder according to the present invention, in the above, the metal material forming the cylinder is aluminum or copper, or the plastic material forming the cylinder is polyacetal, fluororesin, polybutylene terephthalate, phenol resin. , Polyamide or methacrylic resin. In this case, the rotor is desirably formed of cast iron.
[0009]
Furthermore, the rotary feeder according to the present invention is characterized in that, in the above-described rotary feeder, the elastic body is formed of a spring material.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view showing a first embodiment of the present invention, in which 1 is a rotary feeder, 2 is a casing, 3 is a storage space for a rotor formed inside the casing 2, A rotor chamber 4 having a taper inclined inward toward the rear, 4 is an inner peripheral wall surface of the rotor chamber 3, and 5 is a casing 2 provided above the rotor chamber 3 for supplying powder and the like into the rotor chamber 3. A supply port 6 provided with an opening, a discharge port 6 provided with an opening of the casing 2 below the rotor chamber 3 for discharging powder and the like in the rotor chamber 3 to the outside, and a supply port 6 with the supply port 6 A flange for connecting a communicating hopper (not shown), a flange 8 for connecting a device for conveying the powder or the like discharged from the discharge port to the next operation step, a bearing 9 and a bearing 10 The shaft is rotatable via the bearing 9 The rotating shaft 11 is provided at a side end of the rotating shaft, and a chain sprocket for transmitting the power of a motor (not shown) to the rotating shaft 10 and rotating the rotating shaft. 10 is a rotor that rotates about the central axis of the casing 2 integrally with the casing 10.
[0011]
The rotor 12 includes a cylindrical rotor body 14 having a rotor hole 13 through which the rotating shaft 10 is inserted, a plurality of blades 15 radially protruding from an outer peripheral surface of the body 14, and both sides of the blade 15. And a disk-shaped side plate 16 provided at the end. The tip portion 17 of the blade 15 forms a taper with the outer peripheral surface of the side plate 16 in the same direction and the same angle as the taper of the peripheral wall surface 4 of the rotor chamber. Reference numeral 18 denotes a pocket which is a storage space for a granular material or the like formed between adjacent blades.
[0012]
The rotor hole 13 is formed by a small diameter hole 19 and a large diameter hole 20. The small-diameter hole 19 is formed in a portion extending from the front end of the rotor hole 13 to the rear over a predetermined length, and the large-diameter hole 20 is formed from the rear end of the small-diameter hole 19 to the rotor hole. 13 are holes formed up to the rear end. An annular step 21 is formed at the boundary between the small-diameter hole 19 and the large-diameter hole 20. On the inner peripheral surface of the small-diameter hole portion 19, an uneven portion 23 which is in sliding contact with a spline 22 provided on the outer peripheral portion of the rotary shaft 10 facing the inner peripheral surface is formed. The outer peripheral portion of the rotating shaft 10 may be a feather key instead of forming a spline.
[0013]
Reference numeral 24 denotes a cylinder made of a metal material or a plastic material having a higher linear expansion coefficient than the metal material forming the rotor 11. The cylinder 24 is inserted into a gap 25 having an annular cross section between the inner peripheral surface of the large-diameter hole portion 20 and the outer peripheral surface of the rotary shaft 10 with its front end abutting on the annular step portion 21. ing. When the cylinder 24 is formed of a metal material, aluminum, copper, an alloy having a high coefficient of linear expansion, or the like is suitable as the material. When the cylinder 24 is formed of a plastic material, polyacetal, fluorine resin, polybutylene terephthalate, phenol resin, polyamide or methacryl resin is suitable. When a plastic material is used, the temperature of the rotor is about 250 ° C. or less due to its heat resistance.
[0014]
A stopper member 26 for regulating the rearward movement of the rotor 12 and the cylinder 24 is provided on the shaft portion of the rotating shaft 10 at the rear end of the rotor hole 13. The stopper member 26 is a convex member in the example shown in the figure, and its front end 27 is fitted into the rear end of the rotor hole 13 and abuts against the rear end of the cylinder 24. Is configured to close the rear end of the rotor hole 13. The stopper member 26 may be integrally formed with the rotating shaft 10 as shown in FIG. 1, but as shown in FIG. Then, it may be fixed to the rotating shaft 10 by a fastening member 28 such as a set screw or a push bolt.
[0015]
On the other hand, an elastic receiving member 29 is provided at a shaft portion of the rotating shaft 10 at a predetermined distance from a front end of the rotor hole 13 to the front. The receiving member 29 is an annular member in the illustrated example. The center of the receiving member 29 is inserted through the rotating shaft 10 and is fixed to the rotating shaft 10 by a fastening member 30 such as a set screw or a push bolt. An elastic body 31 is compressed between the receiving member 29 and the front end of the rotor 12 to elastically bias the rotor 12 rearward together with the cylinder 24. As the elastic body 31, a spring material is preferable.
[0016]
Next, the operation of the first embodiment will be described.
The angle of inclination of the outer peripheral end of the rotor 12, which is composed of the inner peripheral wall surface 4 of the rotor and the blade tip 15 and the outer peripheral surface of the side plate 16, is set to 3 degrees, and their clearance before the start of thermal expansion is reduced. Assume that the length of the cylinder 24 in the longitudinal direction is 0.1 mm, the length of the tip of the rotor 12 in the outer peripheral direction is 210 mm, and the length of the cylinder 24 is 210 mm. The cylinder 24 is made of fluororesin, and the rotor 12 is made of cast iron. When the temperature inside the rotor chamber 3 becomes high after the start of use of the rotary feeder 1, the rotor 12 and the cylinder 24 both thermally expand. However, since the linear expansion coefficient of the fluororesin is 10 × 10 ⁻⁵ , the temperature of the rotor 12 Is increased from 0 degrees to 200 degrees, the cylinder 24 expands in the longitudinal direction by about 2.8 mm (10 × 10 ⁻⁵ × 140 × 200). Since the movement of the cylinder 24 to the rear is restricted by the stopper member 26, the cylinder 24 extends only in the forward direction, and the rotor 12 and the rotation shaft 10 are engaged by a spline (or feather key) 22. Therefore, the front end of the cylinder 24 pushes the annular step portion 21 to move the rotor 12 in the direction expanded by the arrow in the drawing, that is, about 2.8 mm against the elasticity of the elastic body 31.
[0017]
On the other hand, about 30% of the expansion in the longitudinal direction (coefficient of linear expansion of cast iron is 9.8 × 10 ⁻⁶ ) is expected to expand in the outer circumferential direction at the outer circumferential end of the rotor 12 according to empirical rules. Therefore, it is stretched in the outer circumferential direction by about 0.12 mm (9.8 × 10 ⁻⁶ × 210 × 200 × 0.3). Therefore, the actual clearance is automatically maintained at about 0.03 mm (2.8 mm × tan3 ° −0.12 mm).
[0018]
Next, FIG. 2 shows a second embodiment. The second embodiment is different from the first embodiment in that a groove 32 having an annular cross section is formed over a predetermined length from the front end of the large-diameter hole portion 20, that is, the annular step portion 21 forward. The cylinder 24 is inserted into the groove 32 and the gap 25 having an annular cross section with its front end in contact with the front end of the groove 32. In the second embodiment, the cylinder 24 has a lower linear expansion coefficient than the cylinder of the first embodiment, and is suitable for use in a case where the cylinder 24 is longer in the longitudinal direction.
[0019]
For example, the inclination angle of the outer peripheral tip of the rotor 12 is set to 8 degrees, the clearance before the start of thermal expansion is 0.1 mm, the longitudinal length of the cylinder 24 and the outer peripheral tip of the rotor 12 Assume a longitudinal length of 210 mm. Further, assuming that the cylinder 24 is made of aluminum and the rotor 12 is made of cast iron, and if the rotor 12 rises from 0 degree to 400 degrees, the linear expansion coefficient of aluminum is 24.1 × 10 ^−6. It expands in the longitudinal direction by about 2 mm (24.1 × 10 ⁻⁵ × 210 × 400), and the rotor 12 moves about 2 mm in the direction of the arrow in the figure. On the other hand, since the outer circumferential end of the rotor 12 extends in the outer circumferential direction by about 0.25 mm (9.8 × 10 ⁻⁶ × 210 × 400 × 0.3), the actual clearance is about 0.03 mm ( (2 mm x tan 8 °-0.25 mm).
[0020]
As described above, in the present invention, the length and material of the cylinder 24, the inclination angle of the outer peripheral wall 3 of the rotor chamber and the outer peripheral end of the rotor 12, By appropriately selecting the embodiments of the present invention, it is possible to always secure an appropriate clearance between the inner peripheral wall surface 3 of the rotor and the outer peripheral end of the rotor 12 without galling even during thermal expansion of the rotor. it can. For example, when the cylinder 24 is formed of plastic, a plastic having a shorter longitudinal direction can be used because the linear expansion coefficient of plastic is relatively higher than that of metal. When the temperature of the rotor exceeds 250 degrees, the cylinder 24 is formed of metal due to its heat resistance. The length of the small-diameter hole portion 19 and the annular groove 32, and the mounting position of the receiving member 29 on the rotating shaft 10 are appropriately determined depending on the type and temperature of the granular material used.
[0021]
If the tip 17 of the blade 15 is worn due to long-term use of the rotary feeder, the appropriate clearance before thermal expansion (the clearance before using the rotary feeder is preferably 0.1 mm or less and less than 0 mm). However, if the stopper member 26 is separate from the rotary shaft 10, the clearance can be freely adjusted by adjusting the position of the stopper member 26. That is, the stopper member 26 is detachably fixed to the rotation shaft 10 by the fastening member 28, and the rotor 12 is elastically biased to the stopper member 26 by the elastic body 31. Therefore, by moving the stopper member 26 rearward and fixing it, the above-described adjustment can be easily performed.
[0022]
As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the embodiments, and various modifications may be made within the scope of the claims. It can be implemented with modification.
[0023]
According to the present invention, as described above, even when the rotor thermally expands, the clearance between the tip of the rotor blade and the inner wall of the casing is automatically adjusted by the extension of the cylinder. Is unnecessary, the usability is very high, and the work time can be shortened accordingly. Further, since the structure is extremely simple without using any mechanical or electrical means, it is possible to provide a rotary feeder of this kind at a low cost.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a first embodiment of the present invention.
FIG. 2 is a side sectional view of a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of the second embodiment of the present invention as viewed from the line AA ′ in the direction of the arrow.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary feeder 2 Casing 4 Rotor room inner peripheral wall surface 10 Rotation shaft 12 Rotor 13 Rotor hole 15 Blade 16 Side plate 17 Blade tip 19 Small diameter hole 20 Large diameter hole 21 Annular step 22 Spline (feather key)
23 Concavo-convex part 24 Cylinder 25 Annular gap 26 Stopper member 28, 30 Fastening member 29 Receiving member 31 Elastic body 32 Annular groove

Claims (6)

A tapered rotor having a plurality of blades forming a plurality of pockets, which is inclined toward the rear of the casing and accommodated in a casing having a supply port and a discharge port, is movably accommodated in the axial direction of the rotation shaft. In a tapered rotary feeder having a structure, a portion of the hole of the rotor, which passes through the rotating shaft, extending rearward from a front end thereof over a predetermined length is reduced in diameter, and the rotor is inserted from the rear end of the small-diameter hole portion into the rotor. A portion extending to the rear end of the hole was formed to have a large diameter, and an inner peripheral surface of the small-diameter hole portion was formed with an uneven portion which was in sliding contact with a spline or a feather key provided on an outer peripheral portion of the rotating shaft facing the inner peripheral surface. A metal material or a plastic material having a higher linear expansion coefficient than the metal material forming the rotor in the annular gap in cross section between the inner peripheral surface of the large-diameter hole portion of the rotor hole and the outer peripheral surface of the rotating shaft. A cylinder made of a material is inserted with its front end in contact with an annular step formed at the front end of the large-diameter hole, and a shaft portion of the rotating shaft at a rear end of the rotor hole. Is provided with a stopper member for regulating the backward movement of the rotor and the cylinder, and an elastic body is provided on a shaft portion of the rotating shaft spaced a predetermined distance forward from a front end of the rotor hole. A receiving member is provided, and between the receiving member and the front end of the rotor, an elastic body for biasing the rotor elastically rearward together with the cylinder is compressed and closed. When the rotor becomes high temperature, the cylinder expands due to thermal expansion due to a higher linear expansion coefficient than the rotor, moves the rotor forward against the elasticity of the elastic body, and moves the tip of the blade and the casing. Chestnut Rotary feeder, characterized in that the automatic adjustable lance. A tapered rotor having a plurality of blades forming a plurality of pockets, which is inclined toward the rear of the casing and accommodated in a casing having a supply port and a discharge port, is movably accommodated in the axial direction of the rotation shaft. In a tapered rotary feeder having a structure, a portion of the hole of the rotor, which passes through the rotating shaft, extending rearward from a front end thereof over a predetermined length is reduced in diameter, and the rotor is inserted from the rear end of the small-diameter hole portion into the rotor. A portion extending to the rear end of the hole was formed to have a large diameter, and an inner peripheral surface of the small-diameter hole portion was formed with an uneven portion which was in sliding contact with a spline or a feather key provided on an outer peripheral portion of the rotating shaft facing the inner peripheral surface. An annular gap in cross section between the inner peripheral surface of the large-diameter hole portion of the rotor hole and the outer peripheral surface of the rotary shaft and a predetermined length of hole that is bored forward from the front end of the large-diameter hole portion The front section into the annular groove A cylinder made of a metal material or a plastic material having a higher linear expansion coefficient than the metal material forming the rotor is inserted with its front end in contact with the front end of the annular groove, after the rotor hole. A stopper member for restricting the rearward movement of the rotor and the cylinder is provided on the shaft portion of the end of the rotation shaft, and the rotation is spaced a predetermined distance forward from the front end of the rotor hole. An elastic receiving member is provided on the shaft portion of the shaft, and an elastic member for biasing the rotor elastically rearward together with the cylinder contracts between the receiving member and the front end of the rotor. Being mounted, and when the rotor becomes hot, the cylinder is stretched by thermal expansion due to a higher linear expansion coefficient than the rotor, and the rotor is moved forward against the elasticity of the elastic body. Rotary feeder, characterized in that moving, and the clearance between the tip and the casing of the vane and automatically adjustable to. 3. The rotary feeder according to claim 1, wherein the metal material forming the cylinder is aluminum or copper. 3. The rotary feeder according to claim 1, wherein the plastic material forming the cylinder is any one of polyacetal, fluororesin, polybutylene terephthalate, phenolic resin, polyamide and methacrylic resin. . The rotary feeder according to claim 3, wherein the rotor is formed of cast iron. The rotary feeder according to any one of claims 1 to 5, wherein the elastic body is formed of a spring material.

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