JPH06143282A - Sealed rotary feeder - Google Patents

Abstract

PURPOSE:To prevent the biting of a material and damage to blades by providing blades slidably in channels of a rotor and forming air jet openings at the sites where a casing is brought into contact with blades on the wall face in the rotor rotating direction side of a material feed inlet. CONSTITUTION:A sealed rotary feeder consists of a casing 13a with a material feed inlet 13a at its upper and a material discharge outlet 13a2 at its lower, and a rotor 13b provided with blades 13b5 disposed on the periphery of a rotating shaft in a manner that one blade or more are brought into contact with the inner radius of the casing 13a at all times and a plurality of material carrying chambers 13b2 carrying the given quantities of material alternately. Also, channels 13b3 formed on the rotor 13b, springs 13b4 set at the bottoms of channels and blades 13b encouraged and pressed to the inner face of the casing by the springs 13b4 and slidable in the channels 13b3 are provided, and an air jet opening a1 is formed on a site where the casing 13a is brought into contact with the blades 13b5 on the wall face of the rotor rotating direction side of the material feed inlet 13a.

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 under high temperature and high pressure on a supply side and a discharge 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, the present applicant has proposed a method in which a synthetic resin waste material with a coating film is melt-kneaded and reused after the hydrolysis treatment without removing the coating film (Japanese Patent Application No. 3-103). 192431).

However, the method according to the above proposal is so-called batch processing, and it is difficult to perform continuous processing. In order to carry out further continuous hydrolysis, it is necessary to continuously supply the material to the hydrolysis tank while maintaining the hydrolysis tank at a predetermined temperature and pressure. Conventionally, as to the rotary feeder, JP-B-58-6819 has been proposed as a technique for preventing powder particles from being caught between the blade end portion of the rotor and the case.

[0006]

However, in this prior art, there is no countermeasure against the biting between the blade ends of the rotor and the casing where the most biting may occur. That is, after the material is supplied from the material supply port to the material supply chamber of the rotor, at the portion where the rotor starts contact with the inner surface of the rotary feeder (in other words, it corresponds to the downstream side portion of the material supply port), the material is Material can become trapped between the inner surface of the rotary feeder and the end of the rotor. Such biting causes deformation of the blade, and at the same time, causes a reduction in the sealing performance between the blade and the inner surface of the casing.

The present invention has been made in view of the above problems, and after the material is supplied from the material supply port to the material supply chamber of the rotor, the partial material at which the rotor starts contact with the inner surface of the rotary feeder is charged. To provide a sealed rotary feeder in which material is not trapped between the blade and the inner surface of the casing in the closed position.

[0008]

A seal rotary feeder according to a first aspect of 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, and a cylindrical shape extending from the material supply port to the material discharge port. Blades arranged around the rotary shaft so that at least one of them always contacts the inner semicircle of the casing, and a plurality of material transports for conveying a predetermined amount of the material supplied from the material supply port. A rotor that rotates in a casing having alternating chambers, a groove formed in the rotor, a spring installed at the bottom of the groove, and a groove that is urged by this spring and pressed against the inner surface of the casing. Equipped with a blade slidable inside, on the wall surface of the material supply port on the rotor rotation direction side, at a location downstream of the material supply port where the casing and the blade start contact. Providing an air injection port for injecting a gas.

In the seal rotary feeder according to the second aspect of the present invention, the material that adheres elastically to the outer peripheral surface of the rotor inside the casing on the rotor rotation direction side of the material supply port and the pressing surface between the blade and the casing. Further, a wiping member for wiping off the

[0010]

In the seal rotary feeder according to the first aspect of the invention, the air jetted from the air jet port causes
When the material is supplied, the material adhering to the outer edge portion of the rotor or the outer peripheral edge portion of the blade is blown off, so that the material is prevented from being caught in the inner surface of the casing.

In the seal rotary feeder according to the second aspect of the invention, the material adhering to the outer edge portion of the rotor or the outer peripheral edge portion of the blade is blown off by the air ejected from the air ejection port when the material is supplied. The material is prevented from being caught in the inner surface of the casing, and the material adhering to the pressing surface is wiped off by the wiping member.

[0012]

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 crushing device 110 is composed of a coarse crusher 111 and a fine crusher 112, and the bumper 1 coated
00 is a predetermined length (for example, 30
Crushed into pieces (centimeters) and then fine crusher 1
It is crushed by 12 and becomes a crushed material of about 5 mm square or less. This pulverized material is used as the first weighing and feeding device 120.
, A suction fan 12a, a transport pipe 12b, a cyclone 12c, a rotary feeder 12d, a stock bin 12e, a feed screw 12f and a fixed amount feed screw 12g.

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

FIG. 2 is a cross-sectional view of the hydrolysis device 130. The supply side seal rotary feeder 131, the hydrolysis tank 132 and the discharge side seal rotary feeder 1 are shown.
It consists of 33. Supply-side seal rotary feeder 131 and discharge-side seal rotary feeder 13
3 has the same structure and has a cylindrical casing 13a.
And a rotor 13b having a material transfer chamber 13b2. Then, the crushed material is a material transport chamber 13b provided in a rotor 13b driven by a motor (not shown).
2 is supplied and discharged.

The hydrolysis tank 132 is a device for hydrolyzing the crushed material, and a hollow rotating shaft 13d is installed along the axis of the cylindrical casing 13c. Rotating shaft 1
A screw blade 13e is installed around 3d, and when the rotating shaft 13d is rotated by a motor (not shown), the crushed material supplied from the material supply port 13f is transported to the crushed material discharge port 13g.

The hydrolysis tank 132 has a steam supply port 13h.
The steam introduced through the hollow rotating shaft 13d is supplied from a steam outlet 13k provided around the rotating shaft, and the coating film on the surface of the pulverized material is continuously hydrolyzed to lower the molecular weight. It The atmosphere in the hydrolysis tank 132 is controlled by a relief valve 13j connected to the steam outlet 13i.

The crushed material transported to the discharge port 13g is discharged by the material transport chamber Bb2 of the rotor 13b of the seal rotary feeder 133 on the discharge side, and the drying device 1
40. The drying device 140 includes a drying furnace 141,
It is composed of a rotary feeder 142, a bag filter 143, and a suction fan 144.

A hot air generating furnace (not shown) is used in the drying furnace 141.
A few% (wt%) of hydrolyzed material due to the hot air generated in
The contained water is removed to 0.2% 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. Drying oven 1
The pulverized material in which the coating film accumulated at the bottom of 41 is hydrolyzed is
It is discharged by the rotary feeder 142 and supplied to the second weighing-out device 150.

The second metering and feeding device 150, like the first metering and feeding device 120, has a suction fan 15a, a transport pipe 15b, a cyclone 15c, and a rotary feeder 15.
d, a stock bottle 15e, a feed screw 15f, and a fixed amount feed screw 15g, and the pulverized material having the coating film hydrolyzed is supplied to the melt-kneading device 160. The melt-kneading device 160 is composed of a biaxial kneader 161 and an extrusion die 162. In the biaxial kneading machine 161, the hydrolyzed coating film is finely pulverized to, for example, several tens of micrometers or less and kneaded into a resin to melt and knead the pulverized material.

The extruded material that has been melt-kneaded is extruded from an extruding die 162 having a diameter of, for example, 4 mm to form a linear material, which is supplied to a pellet material manufacturing apparatus 170. The pellet material manufacturing apparatus 170 includes a cooling water tank 171 and a cutting machine 172. The linear material extruded from the extrusion die 162 is cooled in the cooling water tank 171 and hardened. After that, a cutting machine 172 cuts into a predetermined length of, for example, 2 millimeters 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. 3 is an axial cross-sectional view of the seal rotary feeder installed on the supply side and the discharge side of the hydrolysis tank.
a1 and a cylindrical casing 13a having a material discharge port 13a2 at the bottom, and a rotor 13b forming eight blades 13b5 and eight material transport chambers 13b2. Further, the structure is such that at least three blades 13b5 press against the inner semicircle of the casing 13a.

A groove 13b3 is provided in the blade holder portion 13b1 in the axial direction, and the spring 13 is provided in the groove 13b3.
b4 and blade 13b5 are incorporated. The blade 13b5 is urged by the spring 13b4 and pressed against the inner surface of the casing 13a to seal between the material supply port and the material discharge port. The blade holder portion 13b1
Has a terminal formed up to a position close to the inner surface of the casing 13a, but is not in contact with it.

However, the casing 13a and the sealing member 13
If a material is caught between b5 and the blade 13b5, the blade 13b5 is damaged and the sealing effect cannot be maintained. Therefore, it is necessary to provide a mechanism for preventing the material from being caught. Figure 4
FIG. 3 is a cross-sectional view of the seal rotary feeder according to the first invention in a direction perpendicular to the axis, showing an air ejection port a1 at the contact portion between the blade 13b5 and the wall surface of the casing 13a on the rotation direction side of the material supply port 13a1 and further the casing. Supply channel a for supplying air to the air outlet a1 inside 13a
2 and a connection port a3 to which an air source (not shown) is connected.

FIG. 5 is an explanatory view of the positional relationship between the air ejection port a1 and the rotor 13b, and the positional relationship moves from (a) to (d) as the rotor rotates. The flow of jet air is indicated by a broken line. That is, in the state of (a), the jetted air swirls in the material transport chamber 13b2 and is discharged to the material supply port 13a1. Therefore, mainly the discharged material in front b1 of the outer peripheral surface of the blade holder portion 13b1 and the adhering material are blown off.

In the state of (b), the jetted air is branched into two, and one of them is swirled in the material transport chamber 13b2 and discharged to the material supply port 13a1 in front of the pressing surface of the blade. The material adhering to b1 is blown off. The other directly blows off the adhering material by passing directly through the pressing surface of the blade. In the state of (c), the jetted air collides with the pressing surface b2 of the blade and blows off the adhering material.

In the state (2), the jetted air blows off the material adhering to the rear side b3 of the pressing surface of the blade. FIG. 6 is a cross-sectional view of the seal rotary feeder according to the second aspect of the present invention, in which the width of the supply flow path a2 provided in the casing 13a is increased so that the wiping member a is provided inside.
4 is provided.

FIG. 7 is an enlarged cross-sectional view around the wiping member a4. The wiping member a4 has a sock shape, and is rotatably fixed by a pin a5 at the heel portion. The head of the wiping member a4 is urged toward the connection port a3 by the spring a6, and the toe part projects by S into the casing 13a, so that the pressing surface of the blade 13b5 is reliably wiped.

The wiping member a4 has through holes a7 and a8 for guiding the supply from the connection port a3 to the ejection port a1.
And a9 are provided.
Therefore, the air supplied from the air source (not shown) to the connection hole a3 is ejected from the air ejection port a1 in the supply passage a2 through the through holes a7, a8 and a9.

[0031]

According to the first aspect of the present invention, since the material adhering to the pressing surface of the blade is blown off by the air and the high-pressure steam ejected from the air ejection port, the biting of the material and the damage of the blade are prevented. Is possible. According to the second aspect of the present invention, since the material adhering to the blade pressing surface is wiped off by the wiping member, it is possible to prevent the material from being caught and the blade from being damaged.

[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 hydrolysis device.

FIG. 3 is an axial sectional view of a seal rotary feeder.

FIG. 4 is a sectional view of the seal rotary feeder according to the first invention in a direction perpendicular to the axis.

FIG. 5 is an explanatory diagram of a positional relationship between an air ejection port and a rotor.

FIG. 6 is a sectional view of a seal rotary feeder according to a second invention in a direction perpendicular to an axis.

FIG. 7 is an enlarged cross-sectional view around the wiping member.

[Explanation of symbols]

 13a ... Casing 13a1 ... Material supply port 13a2 ... Material discharge port 13b ... Rotor 13b1 ... Blade holder part 13b2 ... Material transport chamber 13b3 ... Groove 13b4 ... Spring 13b5 ... Blade a1 ... Air ejection port a2 ... Supply flow path a3 ... Connection port a4 ... Wiping member

Claims (2)

[Claims] 1. A cylindrical casing having a material supply port in the upper part and a material discharge port in the lower part, and at least one or more always contacts the inner semicircle of the cylindrical casing extending from the material supply port to the material discharge port. A plurality of blades arranged around the rotation axis, and a plurality of material transport chambers for alternately transporting a predetermined amount of material supplied from the material supply port, and a rotor rotating in a casing, and A seal rotary feeder composed of, a groove formed in the rotor, a spring installed at the bottom of the groove, and urged by this spring to be pressed against the inner surface of the casing and slidable inside the groove. Air that has blades and blows air to the wall of the material supply port on the rotor rotation direction side, downstream of the material supply port and where the casing and blade start contact. Seal rotary feeder providing the outlet. 2. A wiping member for elastically contacting an outer peripheral surface of the rotor and a pressing surface between the blade and the casing inside the casing on the rotor rotation direction side of the material supply port to wipe off the material adhering to the outer peripheral surface. The seal rotary feeder according to claim 1, further comprising: