JPH06134760A - Seal rotary feeder - Google Patents

Abstract

PURPOSE:To provide a seal rotary feeder which can be used in a device for continuously hydrolyzing synthetic resin waste material having coating film. CONSTITUTION:A seal rotary feeder comprises a casing 13a having a material supplying port 13a1 formed at its upper part and a material discharge port 13a2 formed at its lower part and a rotor 13b which rotates in the casing and has a blade 13b5 abutting against the inside of the casing 13a. On the rotor, a blade holder 13b1 and a material transporting chamber 13b2 are alternately provided. A material is conveyed by a material transporting chamber for a fixed quantity. The blade holder is provided with a groove 13b3 so as to make the blade 13b5 move in a sliding manner. The blade is energized by a spring 13b4 so as to pressure the inside of the casing, so that high pressure atmosphere at supplying and discharging sides can be sealed. Further, high pressure gas and steam are supplied to the bottom face of the blade so as to push the blade and increase pressing force to the casing, thereby heightening sealing effect.

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 under 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 a conventional technique for disclosing a technique for continuously supplying a material or the like while maintaining a constant pressure, as a conventional technique, Japanese Utility Model Laid-Open No. 55-11
7438 has been proposed. In this prior art,
For the purpose of improving the airtightness between the rotor and the blade in the rotary feeder, the blade is a spring member,
It is pressed against the inner wall of the rotary feeder case.

[0006]

However, in the rotary feeder described in Japanese Utility Model Laid-Open No. 55-117438, the blade contacting the inner wall of the casing is always pressed by the elastic body against the inner wall of the casing. .
Therefore, the higher the rotary feeder internal pressure is kept, the stronger the elastic force of the elastic body will be set, but with this, the blade will always come into contact with the inner wall of the casing with a strong force, resulting in severe wear. Because,
Its life is shortened and frequent maintenance and inspections are required.

The present invention has been made in view of the above problems, and can be used for an apparatus for continuously hydrolyzing a coated synthetic resin waste material under high temperature and high pressure without deteriorating the material strength. The purpose is to provide a seal rotary feeder capable of performing.

[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 sheet always contacts the inner semicircle of the casing and a plurality of material transport chambers for transporting a predetermined amount of the material supplied from the material supply port. A seal rotary feeder composed of a rotor that rotates in a casing that alternately includes and a spring installed in a lower portion of a groove formed in the rotor, and an inner surface of the casing that is biased by the spring. A blade that is slidable inside a groove that presses against the blade, and that has a blade within the rotation range of the rotor that includes a material supply port or material discharge port connected to the high pressure side. And Shirube圧 mechanism for introducing a high-pressure gas for pressurizing the casing inner surface direction, and a discharge mechanism for discharging a high-pressure gas in the range of rotation of the remaining rotors and provided.

A seal rotary feeder according to a second aspect of the present invention is a cylindrical casing having a material supply port in the upper part and a material discharge port in the lower part, and an inner semicircle of the cylindrical casing extending from the material supply port to the material discharge port. A plurality of blades arranged around the rotary shaft so that at least one of them is always in contact with and a plurality of material transfer chambers for transferring a predetermined amount of the material supplied from the material supply port. A seal rotary feeder composed of a rotor rotating in a casing, wherein a spring holder installed at a lower part of the groove inside a groove provided at each rotor outer periphery, and a spring installed on the spring holder, A material supply port or material that is equipped with a blade that is slidable inside a groove that is biased by this spring and presses against the inner surface of the casing, and that is connected to the high pressure side. A spring compression mechanism that moves a spring holder installed at the bottom of the rotor groove to the outside in the radial direction on the high pressure side that is at least a semicircle or more of a casing having one outlet and compresses the spring to increase the biasing force to the blade. And a spring extension mechanism for moving the spring holder installed at the bottom of the groove of the rotor inward in the radial direction to weaken the spring force and reduce the urging force to the blade on the remaining low pressure side other than the high pressure side casing.

[0010]

In the seal rotary feeder according to the first aspect of the invention, the bottom surface of the seal member on the high pressure side is pressurized by the high pressure gas, and the high pressure air is discharged on the low pressure side, and the seal member is supplied to the casing. Adjusting the pressing force enhances the sealing effect and suppresses blade wear.

In the seal rotary feeder according to the second invention, the seal effect is enhanced by moving the spring holder in the radial direction to change the compression degree of the spring and adjusting the pressing force of the blade against the casing. Suppresses blade wear.

[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 crushed into a piece having a predetermined length (for example, 30 cm) by the coarse crusher 111, and then the fine crusher 11
It is crushed by 2 and becomes a crushed material 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, the rotary feeder 12d, the stock bin 12e, the feed screw 12f, and the fixed amount feed screw 1 are provided.
Composed of 2g.

That is, the pulverized material is sucked by the suction fan 12a and is fed to the cyclone 12c through the transport pipe 12b.
The crushed material stored in the cyclone 12c is the cyclone 1
The rotary feeder 12d installed at the bottom of 2c discharges the crushed material stock bin 12e. The crushed material discharged to the crushed material stock bin 12e is transported to 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.

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. The crushed material is supplied by a material transfer chamber provided in the rotor 13b driven by a motor (not shown).
Is 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 of the rotor 13b of the seal rotary feeder 133 on the discharge side and supplied to the drying device 140. The drying device 140 includes a drying furnace 141, 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, it is cut by a cutting machine 172 into a predetermined length having a diameter of 2 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. 3 and 4 are a cross-sectional view and a cross-sectional view in the direction perpendicular to the axis of the seal rotary feeder installed on the supply side and the discharge side of the hydrolysis tank, with the material supply port 13a1 at the upper part and the material discharge port 13a2 at the lower part. A cylindrical casing 13a having
It is composed of a blade 13b5 and a rotor 13b having 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.

The groove 1 is axially formed in the blade holder 13b1.
3b3 is provided, and the spring 13b is provided in the groove 13b3.
4 and blade 13b5 are incorporated. The blade 13b5 is biased 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. Here, in the blade that presses the casing on the side having the high-pressure side of the material supply port or the material discharge port, it is necessary to strengthen the pressing force in order to perform a reliable seal. The blade pressing against the casing on the holding side needs to suppress the pressing force so that the seal member is not unnecessarily worn.

FIG. 5 is a partial sectional view of the seal rotary feeder for explaining the first embodiment, in which the material supply port 13a1 is on the low pressure side, the material discharge port 13a2 is on the high pressure side, and the rotor 13b is High-pressure gas is introduced into the gap b1 between the bottom of the groove 13b3 and the lower surface of the blade 13b5 to pressurize the blade 13b5. Therefore, the rotor side plate b
2, a rotor introduction flow path b3 and a rotor discharge flow path b4, a casing side plate a1, a casing introduction flow path a2, a casing supply groove a3, a casing discharge groove a4 and a casing discharge flow path a5, and a casing discharge hole in the casing 13a. a6 is provided.

In at least five blades which press the lower part of the casing 13a in which the material discharge port 13a2 is installed, the casing introduction passage a2, the rotor introduction passage b3 and the gap b1 are provided in the casing side plate a1. And is in communication with the casing supply groove a3,
High-pressure gas supplied from the outside is supplied to the gap b1,
The blade 13b5 is pushed outward in the radial direction to increase the pressing force on the casing 13a.

Casing 1 in which a material supply port is installed
For the remaining three blades that press on top of 3a,
The rotor discharge flow passage b4, the casing discharge flow passage a5, and the casing discharge hole a6 are in communication with each other through the casing discharge groove a4 and the space a7 provided between the rotor side plate b2 and the casing side plate a1 and are introduced into the gap b1. The high pressure air is discharged.

Therefore, the casing 13 of the blade 13b5
The pressing force on a is only the biasing force of the spring 13b4,
Blade wear is suppressed. FIG. 6 shows the casing side plate a.
1 is an inner surface view of FIG. 1, showing the shapes of a casing supply groove a3 and a casing discharge groove a4 provided on the inner surface. That is, double concentric seals a8 and a9 are embedded in the inner surface of the casing side plate a1.

A casing supply groove a3 is provided in the center of the inner seal a8 over a range of an arc H, and gas is supplied from the casing supply passage a2. Therefore, the blade within the blade holder within the range of the arc H is pushed outward in the radial direction, and the pressing force with the casing is increased. A casing discharge groove a4 is provided in the center of the outer seal a9 over the range of the arc L, and gas is discharged through the casing discharge flow path a5. Therefore, arc L
1 in the blade holder 13b1 in the range of
3b5 is only biased by the spring 13b4, and the pressing force with the casing 13a is weakened.

FIG. 7 is a second inner surface view of the casing side plate a1, and a second casing discharge groove a4 is provided in the center of the arc H of FIG. 6 over the range of the arc L ₂ . Arc L ₂
This range corresponds to the range in which the blade 13b5 is above the material discharge port 13a2. By discharging the air in the gap a1 within this range, the pressing force of the blade 13b5 on the casing is weakened and wear on both ends of the blade 13b5 is suppressed. It becomes possible to do. In this case, it is obvious that it is necessary to change the paths of the supply passage a2 and the discharge passage a5 shown in FIG.

FIG. 8 is a partial cross-sectional view of the seal rotary feeder for explaining the second embodiment. Instead of supplying high pressure gas from the outside, the blade 13b5 is pushed by the high pressure steam downstream of the material discharge port 13a2. It is the one. That is, the casing supply flow path a2 is connected to the material discharge port 1
3a2, and the casing discharge hole a6 is opened to the material supply port 13a1.

With this structure, the high-pressure steam downstream of the material discharge port 13a2 is transferred to the casing supply passage a2,
It is supplied to the gap b1 through the casing supply groove a3 and the rotor supply flow path b3. Also in the second embodiment, the shapes of the casing supply groove and the casing discharge groove provided on the inner surface of the casing side plate can be any of the shapes shown in FIGS. 6 and 7.

FIG. 9 is an X-X sectional view of the rotor of the second embodiment, in which the width A of the bottom surface of the blade 13b5 is made larger than the width B of the surface pressed against the casing. Therefore, the force applied to the bottom by the high-pressure steam becomes larger than the force applied to the upper surface at the material discharge port 13a2 by the same high-pressure steam, and the sealing member 13b5 is pushed outward in the radial direction, and the pressing force on the casing 13a is increased. Can be increased.

FIG. 10 is a partial cross-sectional view for explaining the third embodiment. A spring holder 13b6 is installed at the bottom of a groove 13b3 provided in a rotor, and a spring 13b4 is fixed to the spring holder 13b6. The blade 13b5 is installed on the top. The spring holder 13b6 penetrates the rotor side plate b1 and projects to both sides of the rotor, and a roller b5 is provided on the projecting portion. This roller b5 is a casing side plate a
It is fitted with the guide groove a10 engraved on the inner surface of 1, and the spring holder 13b6 moves in the rotor radial direction inside the rotor groove 13b3 according to the shape of the guide groove a10.

FIG. 11 is a casing according to the third embodiment.
It is an inner surface view of the side plate a1, and the outer diameter of the guide groove a10 is a circle.
Arc H₁And H₂R in the range_HAnd the arc L₁And
And L ₂R in the range_LIs. And in the range of the arc T
Guide so that guide grooves with different radii are connected smoothly
A groove is formed. Note that r_H > R_L And

Therefore, in the blade 13b5 within the range of the arcs H ₁ and H ₂ , the spring holder 13b6 moves radially outward of the rotor 13b to compress the spring 13b4 and push the blade 13b5 to increase the pressing force of the blade 13b5. . In the blade within the range of the arcs L ₁ and L ₂ , the spring holder 13b6 moves inward in the radial direction of the rotor 13b to extend the spring 13b4 and weaken the pressing force of the blade 13b5.

The reason why the pressing force is weakened in the range of the arc L ₂ is to suppress excessive wear of both ends of the blade 13b5, and the range of the arc L ₂ may be omitted for simplifying the structure. Is. Although the material supply port 13a1 has been described as the low pressure side and the material discharge port 13a2 has been described as the high pressure side in the above three embodiments, the present invention can also be applied when the material supply port 13a1 is the high pressure side and the material discharge port 13a2 is the low pressure side. Is clear.

[0038]

According to the first aspect of the present invention, by supplying high pressure gas to the bottom surface of the blade, it is possible to increase the pressing force of the blade and enhance the sealing effect, and to discharge the high pressure gas within a predetermined range. Thus, the pressing force can be weakened to suppress the abrasion of the blade.

According to the second aspect of the invention, by moving the spring holder fitted in the guide groove to the outside of the rotor, the pressing force of the blade can be increased and the sealing effect can be enhanced. By moving it to the inside of the rotor, it becomes possible to reduce the pressing force and suppress the wear of the blade.

[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 a cross-sectional view in the direction perpendicular to the axis of the seal rotary feeder installed on the supply side and the discharge side of the hydrolysis tank.

FIG. 4 is an axial cross-sectional view of the seal rotary feeder installed on the supply side and the discharge side of the hydrolysis tank.

FIG. 5 is a partial cross-sectional view of the first embodiment.

FIG. 6 is an inner surface view of a casing side plate.

FIG. 7 is a second inner surface view of the casing side plate.

FIG. 8 is a partial cross-sectional view of the second embodiment.

FIG. 9 is a sectional view of the rotor taken along line XX.

FIG. 10 is a partial cross-sectional view of the third embodiment.

FIG. 11 is an inner surface view of a casing side plate in the third embodiment.

[Explanation of symbols]

 13a ... Casing 13a1 ... Material supply port 13a2 ... Material discharge port 13b ... Rotor 13b1 ... Blade holder 13b2 ... Material transport chamber 13b3 ... Groove 13b4 ... Spring 13b5 ... Blade

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 rotor having a plurality of blades arranged around the rotating shaft and a plurality of material transport chambers for transporting a predetermined amount of material supplied from a material supply port alternately, and rotating in a casing. And a spring installed at the bottom of the groove formed in the rotor, and a blade that is urged by the spring to be pressed against the inner surface of the casing and slidable inside the groove. In addition, the high pressure gas for pressurizing the blade toward the inner surface of the casing is introduced in the rotation range of the rotor including the material supply port or the material discharge port connected to the high pressure side. Shirube圧 mechanism and the remaining seal rotary feeder provided with discharge mechanism for discharging a high pressure gas, with the range of rotation of the rotor. 2. A cylindrical casing having a material supply port at an upper part and a material discharge port at a lower part, and at least one or more always contact with an inner semicircle of the cylindrical casing extending from the material supply port to the material discharge port. A rotor having a plurality of blades arranged around the rotating shaft and a plurality of material transport chambers for transporting a predetermined amount of material supplied from a material supply port alternately, and rotating in a casing. A seal rotary feeder consisting of, and a spring holder installed in the lower part of the groove inside the groove provided in the outer peripheral part of each rotor, a spring installed on the spring holder, and an urging force by this spring. At least one of a material supply port and a material discharge port connected to the high pressure side, and a blade slidable in the groove pressed against the inner surface of the casing. The spring holder installed at the bottom of the rotor groove on the high pressure side, which is more than the semicircle of the housing, moves outward in the radial direction to compress the spring and increase the biasing force to the blade. A seal rotary feeder provided with a spring extension mechanism that moves a spring holder installed at the bottom of the groove of the rotor on the low pressure side inward in the radial direction to weaken the spring force and reduce the biasing force to the blade.