JPH079449A - Seal rotary feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a seal rotary feeder capable of reducing the amount of leakage of the atmosphere on the downstream side to the upstream side. [Structure] A blade 13b is provided inside the casing 13a.
A rotor 13b having 1 is arranged. Then, on the feed side of the rotor, the blade contacts the casing, and the material is transported from the material supply port 13a1 to the material discharge port 13a2 by the transport chamber 13d defined by the rotor and the blade. On the other hand, on the return side of the rotor, the blade is drawn into the rotor, and the rotor and the casing come into direct contact with each other, so that it is possible to reliably prevent the downstream atmosphere from leaking to the upstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary feeder for continuously supplying and discharging a material, and more particularly to a seal rotary feeder capable of sealing an atmosphere on an upstream side and a downstream side.

[0002]

2. Description of the Related Art In recent years, it has been required to recycle synthetic resin waste materials from the viewpoint of environmental protection, but it is usual to melt and remold the waste materials. However, in Japan, it is common to apply a thermosetting paint to the surface of the synthetic resin material in order to maintain the beauty of the product.
Even if the waste material is melted, the paint is not decomposed, and if it is remolded as it is, it is inevitable that the material strength is deteriorated because the coating film is mixed.

For example, when a bumper is made of waste material,
Collision resistance in cold regions is lower than that of new materials. If the coating film is removed, the reduction in material strength can be avoided, but it is difficult to remove the coating film. That is, it is possible to mechanically remove the coating film by shot blasting etc., but if the shape of the parts is complicated, not only it takes time to remove the coating film, but also it cannot be completely removed. Not suitable for processing.

It has also been proposed to strip the coating with organic salts, but the use of organic salts cannot overcome the environmental problems. In order to solve the above problems, there has been proposed a method in which a synthetic resin waste material with a coating film is subjected to a hydrolysis treatment and then melt-kneading without removing the coating film to regenerate it. Then, the present applicant previously proposed a seal rotary feeder capable of continuously supplying material to the hydrolysis tank while maintaining the hydrolysis tank at a predetermined temperature and pressure in order to continuously perform the hydrolysis. (Japanese Patent Application No. 4-295231).

[0005]

However, in the seal rotary feeder according to the above proposal, since the transfer chamber is formed not only in the feeding step but also in the returning step, the water is installed downstream of the seal rotary feeder in the returning step. It is unavoidable that the atmosphere in the decomposition tank leaks to the upstream side, and improvement has been desired.

The present invention has been made in view of the above, and an object of the present invention is to provide a seal rotary feeder capable of reducing the amount of leakage of the atmosphere on the downstream side to the upstream side.

[0007]

SUMMARY OF THE INVENTION A seal rotary feeder according to the present invention comprises a cylindrical casing having a material supply port in the upper part and a material discharge port in the lower part, a rotor rotatably disposed in the casing, and a rotor. A plurality of vanes that are slidably disposed in a groove radially provided in the rotor and are urged toward the outer circumferential direction of the rotor by a spring disposed at the groove bottom,
In the seal rotary feeder composed of, the vane disposed on the moving side from the material supply port to the material discharge port of the rotor contacts the inner surface of the casing, and on the moving side from the material discharge port to the material supply port. The center of the rotor is arranged eccentrically from the center of the casing so that the rotor directly contacts the inner surface of the casing.

[0008]

According to the seal rotary feeder of the present invention, on the material supply side, the material is transferred by the transfer chamber defined by the vane and the casing, and on the return side, the rotor directly contacts the casing, and the transfer chamber is Not defined.

[0009]

EXAMPLE FIG. 1 is a flow sheet of a continuous recycling apparatus for synthetic resin waste material with a coating film. The coated resin waste material is, for example, a polypropylene (hereinafter referred to as PP) bumper 100, the surface of which is coated with polyester / melamine or acrylic / melamine paint.

If the synthetic resin is a thermoplastic resin, P
It is not limited to P and may be modified polypropylene, polyethylene, ABS resin, AS resin, polyamide resin, polyester resin, polycarbonate resin, polyacetal resin, polyphenylene oxide or modified polyphenylene oxide. The coating material to be applied may be a urethane-based or amino resin-based coating material that is hydrolyzed to have a low molecular weight.

The crusher 110 is composed of a coarse crusher 111 and a fine crusher 112. The bumper 100 has a predetermined length (for example, 30 cm) by the coarse crusher 111 with the coating film on the surface. Crushed into a rod shape and then crushed by the fine crusher 112 to obtain a crushed material having a size of about 5 mm square or less. This pulverized material is supplied to the first metering and feeding device 120, and the suction fan 12a, the transport pipe 12b, the cyclone 12c, and the rotary feeder 12 are provided.
d, stock bin 12e, feed screw 12f, and fixed amount feed screw 12g.

That is, the pulverized material is sucked by the suction fan 12a and transported to the cyclone 12c in the transport pipe 12b.
The crushed material stored in the cyclone 12c is the cyclone 1
It is transferred to the crushed material stock bin 12e by the rotary feeder 12d installed at the bottom of 2c. The crushed material transferred to the crushed material stock bin 12e is collected in one side by the feed screw 12f installed at the bottom of the crushed material stock bin 12e, and is fed to the hydrolysis device 130 by a fixed amount by the fixed amount feed screw 12g.

The hydrolysis device 130 comprises an upstream seal rotary feeder 131, a hydrolysis tank 132 and a downstream seal rotary feeder 133. The pulverized material is supplied to the hydrolysis tank 132 by the upstream seal rotary feeder 131 in a fixed amount and is hydrolyzed in the hydrolysis tank 132. The pulverized material transferred to the discharge port of the hydrolysis tank 132 is conveyed by the downstream seal rotary feeder 133 and supplied to the drying device 140.

The drying device 140 comprises a drying furnace 141, a rotary feeder 142, a bag filter 143 and a suction fan 144. The hot air generated by the hot air generating furnace (not shown) in the drying furnace 141 removes the moisture contained in the hydrolyzing material by several% (wt%) to 0.1% or less. The air containing water is sucked by the suction fan 144 and released into the air. The paint and PP pulverized by the bag filter 143 may be removed before being released into the atmosphere.

The crushed material accumulated at the bottom of the drying furnace 141 is
It is discharged by the rotary feeder 142 and supplied to the second weighing-out device 150. The second metering and delivering device 150 is similar to the first metering and delivering device 120 in that the suction fan 15a, the transport pipe 15b, the cyclone 15c,
A rotary feeder 15d, a stock bin 15e, a feed screw 15f, and a fixed amount feed screw 15g, which melt and knead a pulverized material whose coating film is hydrolyzed.
Supply to.

The melt-kneading device 160 comprises a biaxial kneader 161 and an extrusion die 162. In the twin-screw kneader 161, the pulverized material is melt-kneaded in order to atomize the hydrolyzed coating film into, for example, several tens of micrometers or less and knead it into the resin. The melt-kneaded pulverized material is extruded from an extrusion die 162 having a diameter of, for example, 3 mm to be a linear material, which is supplied to the pellet material manufacturing apparatus 170.

The pellet material manufacturing apparatus 170 includes a cooling water tank 1
71 and a cutting machine 172. Extrusion die 1
The linear material extruded from 62 is cooled and hardened in the cooling water tank 171. After that, it is cut by a cutting machine 172 into a predetermined length of 3 mm, for example, to form a cylindrical pellet material. This pellet material is used as a raw material in a bumper manufacturing process (not shown), for example.

FIG. 2 is a cross-sectional view of the first embodiment of the seal rotary feeder according to the present invention installed upstream of the hydrolysis tank in the direction perpendicular to the axis.
1, a cylindrical casing 13a having a material discharge port 13a2 in the lower portion, and a rotor 13b having eight blades 13b1. A rotary shaft 13c1 passes through the center of the rotor 13b and is fixed by a key 13c2.

That is, eight grooves 13b2 are formed in the rotor, and the blades 13b1 are inserted in the grooves 13b2. A spring 13b3 is installed at the bottom of the groove 13b2 to urge the blade 13b1 toward the outside. Then, the rotor 13b rotates clockwise and the blade 13
On the side where b1 moves from the material supply port 13a1 toward the material discharge port 13a2, that is, on the right side of the casing 13a in FIG. 2, the material is supplied by the material transfer chamber 13d defined by the blade 13b1 and the rotor 13b. The material is conveyed from 13a1 to the material discharge port 13b2.

On the side where the blade 13b1 moves from the material discharge port 13a2 toward the material supply port 13a1, that is, on the left side of the casing 13a in FIG.
so that the blade b directly contacts the casing 13a and the blade 13b1 is completely drawn into the groove 13b2.
The center of 3a and the center of the rotor 13b are eccentrically installed.

Therefore, according to this embodiment, the casing 13
Direct contact between a and the rotor 13b reliably prevents the atmosphere downstream of the material discharge port 13a2 from leaking to the material supply port 13a1 side. The casing 13a
An air supply port 13a3 is provided on the left side of the material supply port 13a1 side, and air is supplied to a gap formed between the casing 13a and the rotor 13b via an air supply pipe 13a4 and a check valve 13a5. The gap formed between the rotor 13b and the rotor 13b becomes a vacuum, and the atmosphere downstream of the material discharge port 13a2 is prevented from being sucked.

FIG. 3 is a sectional view of a second embodiment of the seal rotary feeder according to the present invention, in which the casing 1
The member 13e is disposed integrally with the casing 13a on the side of the material supply port 13a1 on the left side of 3a, and it is essentially prevented that a gap is formed between the casing 13a and the rotor 13b. Therefore, according to the second embodiment, the material outlet 13a
2 It becomes possible to more reliably prevent the downstream atmosphere from being sucked.

FIG. 4 is a sectional view of a third embodiment of the seal rotary feeder according to the present invention, which is a rotor 13b.
Is provided with a basket 13b4. In this case, although the leakage of the downstream atmosphere increases, it becomes possible to improve the material carrying capacity.

[0024]

According to the present invention, since the rotor directly contacts the casing in the returning process of the rotor, it is possible to greatly reduce the leakage of the downstream atmosphere to the upstream side.

[Brief description of drawings]

FIG. 1 is a flow sheet of a continuous recycling apparatus for coated synthetic resin waste materials.

FIG. 2 is a sectional view of a first embodiment of the rotary feeder according to the present invention.

FIG. 3 is a sectional view of a second embodiment of the rotary feeder according to the present invention.

FIG. 4 is a sectional view of a third embodiment of the rotary feeder according to the present invention.

[Explanation of symbols]

 13a ... Casing 13a1 ... Material supply port 13a2 ... Material discharge port 13a3 ... Air supply port 13a4 ... Air supply piping 13a5 ... Check valve 13b ... Rotor 13b1 ... Blade 13b2 ... Groove 13b3 ... Spring 13b4 ... Basket 13c1 ... Rotating shaft 13c2 ... Key 13d ... a transfer chamber 13e ... a member

Claims (1)

[Claims] 1. A cylindrical casing having a material supply port in the upper part and a material discharge port in the lower part, a rotor rotatably disposed in the casing, and a groove radially provided in the rotor. A seal rotary feeder composed of a plurality of vanes that are movably arranged and are urged toward the outer circumference of the rotor by a spring arranged at the bottom of the groove, the seal rotary feeder comprising: The vane disposed on the moving side to the material discharge port contacts the inner surface of the casing, and on the moving side from the material discharge port to the material supply port, the rotor directly contacts the inner surface of the casing. A seal rotary feeder characterized in that the center is arranged eccentrically from the center of the casing.