JPS6335405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deterioration layer peeling device for synthetic resin molded products, and more specifically, it is used to recycle synthetic resin molded products that have been used for a long time and have a deteriorated layer on the surface. The present invention relates to a device for peeling off layers.

Synthetic resin molded products, such as crates and containers, which are used for a long period of time and then discarded, are often used outdoors and are exposed to ultraviolet rays, so that their surfaces generally deteriorate. Currently, such deteriorated synthetic resin molded products are often discarded, but this deteriorated layer is usually only the surface layer of the synthetic resin molded product, and if this deteriorated layer is successfully removed, it can be considered a used synthetic resin molded product. It is recyclable. However, it is relatively difficult to efficiently and completely peel off the surface deteriorated layer of a synthetic resin molded product and separate it from the reusable resin part. The degraded layer was mixed in and caused a decline in the quality of the recycled synthetic resin.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for removing deteriorated layers of synthetic resin molded articles that efficiently and completely removes deteriorated layers formed on the surfaces of used synthetic resin molded articles.

To summarize, the device for removing deteriorated layers of synthetic resin molded products of the present invention includes a fixed disk having an opening in the center and a rough surface formed on at least one side, and a rotational center axis that substantially coincides with the center axis of the fixed disk. a rotating disk having a rough surface formed on at least one side thereof, the rough surface of the rotating disk facing the rough surface of the fixed disk and being spaced apart from the fixed disk at a predetermined interval; It is characterized in that it includes a shock absorber that supports a rotary disk so as to be able to move up and down, and a device that rotates the rotary disk.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus for removing deteriorated layers of synthetic resin molded products of the present invention will be described in more detail below with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a deteriorated layer separation and collection device A including a device for peeling a deteriorated layer of a synthetic resin molded article (hereinafter simply referred to as a peeling device) according to the present invention.

Degraded layer separation and collection device A shown in FIG.
It is roughly divided into one crusher 10 for crushing used synthetic resin molded products, and two peeling devices 11 and 1.
2. One collision peeling machine 13, a collection device 1 that collects the separated degraded powder and the recyclable resin part, respectively.
4, 15 and equipment incidental thereto. The detailed configuration of such deteriorated layer separation and collection device A will be explained together with the process of peeling off and separating and collecting the deteriorated layer on the surface of the used synthetic resin molded product.
A used synthetic resin molded article having a deteriorated layer on its surface is crushed by a crusher 10 into granules having a size of usually 1 to 10 mm, preferably 3 to 8 mm, particularly about 5 m/m.

The granule discharge port in this crusher 10 is provided with a rotary blade device 1 for sealing and feeding provided at the discharge port.
6 to the pneumatic transport pipe 17. This pneumatic transport refers to transporting objects to the destination by the flow of air flowing inside the pipe, and in pneumatic transport pipes, the air flow for this purpose is generated from one end to the other. It refers to a tube. One end of the pneumatic transport pipe 17 is opened to the atmosphere via an air filter device 18 attached to the one end. The other end is a first peeling device 11
It is connected to the blower 20 using a cyclone 19 placed on the top of the cyclone 19 as a relay point. This results in
By operating the blower 20, the air in the pipe connected to the blower is exhausted from the discharge port 21, and air is sucked in from the air filter 18 at one end via the internal chamber of the cyclone 19 and into the transport pipe 17. Generate air flow.

As a result, the synthetic resin molded product (hereinafter simply referred to as granules) granulated by the crusher 10 is transferred to the pneumatic transport pipe 1.
7, the granules are transported into the cyclone 19 by the air flow in the transport pipe 17. Since this cyclone 19 has a relatively large inverted cone-shaped internal chamber, the pressure of the air flow is rapidly reduced, and as a result, particulate matter that has flown into the internal chamber from the side wall of the cyclone is caused by its own weight. Due to the rotation along the inverted conical wall due to inertia, the cyclone 19 falls to the lower part of the inner chamber of the cyclone 19, and separates air, which is a transport medium, and granular materials, which are objects to be transported.

Next, the particulate matter in the cyclone 19 is fed into a hopper 22 located directly below the cyclone, and the particulate matter put into the hopper 22 is further rotary fed into the first peeling device 11 located directly below the hopper 22. It is supplied via valve 23. By the way, some of the granules crushed by the crusher 10 include surface parts of synthetic resin molded products, and therefore, there are deteriorated parts on the surfaces of those granules that were the surfaces of molded products. Existing. Therefore, if the degraded layer existing on one surface of such particles is peeled off and removed, the other resin parts can be recycled. The used synthetic resin molded product is thus granulated, and the first peeling device 11 is used to peel off the deteriorated layer present on the surface thereof.

FIG. 2 shows a schematic structure of the peeling device 11. Referring to FIG. 2, the peeling device 11 includes:
It includes a cylindrical casing 24. The upper part of the casing 24 forms a holding section 25 for receiving and holding particulate matter from the hopper 22. The wall portion of the holding portion 25 of this casing 24 includes:
Two limit switches 26a and 26b are installed to sense the amount of particulate matter retained, the upper limit switch 26a sensing the maximum amount of particulate matter retained, and the lower limit switch 26b sensing the minimum amount of retained particulate matter. These two limit switches 26a, 26b
The on/off operation in is controlled to stop the operation of the rotary valve 23, thereby making it possible to always secure a predetermined amount of particulate matter in the holding section 25.

Inside the casing 24 below the holding section 25, a large number of fixed disks 27 are arranged in the axial direction.
a, 27b, 27c, . . . 27f, 27g are attached to the inner wall of the casing. Each of these fixed disks 27a to 27g has an opening 28 in its center.
a to 28g are formed, and the lower surface of each fixed disk is an inclined surface 29a that slopes toward the central opening.
It has an inverted funnel shape forming ~29g. In the inverted funnel-shaped recesses on the lower surfaces of each of these fixed disks 27a to 27g, rotating disks 30a to 30g each having a truncated cone shape are installed on their inclined surfaces 31a to 31g.
and inclined surfaces 29a to 29 of fixed disks 27a to 27g.
They are arranged at positions such that they face each other at a predetermined interval, that is, at a maximum interval of 0.5D or more, preferably from 0.5D to 5D (D: crushed particle diameter).

These fixed disks 27a to 27g and rotating disk 3
0a to 30b are each formed into a pair, and the fixed disk and rotating disk of each pair have the same configuration. Therefore, the pair of fixed disks 27a and rotating disks 30a will be explained in more detail. FIGS. 3a, b, and c show details of the fixed disks 27a. As is clear from these figures, the inclined surface 29a on the lower surface of the fixed disk 27a is formed into a rough surface with a mountain-shaped cross section (FIG. 3c) having a large number of ridges 32 extending in the radial direction of the disk. .

On the other hand, in the rotating disk 30a, the inclined surface 31a on the upper surface facing the inclined surface 29a of the fixed disk 27a is also formed into a rough surface with a mountain-shaped cross section (FIG. 4c), similar to that of the fixed disk. There is.

The cross-sectional shapes of the facing inclined surfaces 29a and 31a of the fixed disk and the rotating disk are shown in FIG. 3c.
and need not be limited to the shape shown in Figure 4c, but may have a serrated shape, a trapezoidal thread shape, a wavy shape, or a hard brush on its surface, as shown in Figures 5a, b, c and d. It is also possible to have a configuration with In this case, both the inclined surfaces 29a and 31a of the fixed disk and the rotating disk may have different shapes, but it is usually desirable that they both have the same shape.

Furthermore, the fixed disk 27a and the rotating disk 30a are
As is clear from FIG. 2, the facing inclined surface 29
The distance between a and 31a is different in the radial direction. That is, the inclination angles of both inclined surfaces are set so that the interval is relatively wide in the radial direction and becomes gradually narrower as it goes outward.
However, at this time, it is desirable that the inclination angle α (FIG. 4b) of the inclined surface 31a of the rotating disk 30a is set to 45 degrees or less. The reason is that the slope 3
If 1a is formed with a steep angle of 45 degrees or more,
This is because the granules placed in the peeling device 11 fall downward without being subjected to predetermined deformation pressure, friction, polishing, etc. Note that the inclination angle α is preferably 20 degrees or less.

Further, a plurality of particle conveying blades 33 extending in the radial direction are formed on the lower surface of the rotating disk 30a.
An effect is provided to transport the particulate matter deposited on the upper surface of the fixed disks 27b to 27g downward through the openings of the fixed disks.

Rotating disks 31a to 31g configured in this way
are openings 28a to 28 of fixed disks 27a to 27g.
are fixedly supported on one common axis of rotation 34 extending through g. The rotating shaft 34 has its upper end supported by a bearing section 36 supported by a plurality of arms 35 extending from the inner wall of the casing 24 . The bearing portion 36 forms a certain amount of space 37 above the upper end surface of the rotating shaft, and supports the rotating shaft 34 so as to be slidable in the vertical direction inside the bearing portion.

On the other hand, the other end of the rotating shaft 34 extends outside the casing 24 via a bearing portion 38 provided on the bottom wall of the casing 24, and extends onto the receiving plate 40a via a rotatable support 39 such as a roller bearing. is arranged so that it can rotate. And each rotating disk 30
The entire rotating shaft 34 together with a to 30g is attached to the receiving plate 40 at the upper end of a short shaft 43 extending from a shaft reciprocating device 42 placed on a shaft vertical position adjustment device 41.
It is supported via a buffer spring 44 disposed between the receiving plate 40b and the receiving plate 40a, which are attached to face each other.

A worm wheel 45 is fixed to a portion extending outward from the bottom of the casing 24 with a key or a spline to provide rotational power for the rotating shaft 34, and a worm 46 is disposed to mesh with the worm wheel 45. There is. The rotation shaft of this worm 46 is connected to the drive shaft of a suitable electric motor (not shown), so that the rotation of the electric motor rotates the worm 46, which in turn rotates the worm wheel 45, which drives the rotation shaft 34. Rotate.

According to the peeling device 11 having such a configuration, when the rotating disks 30a to 30g are rotated at about 500 rpm or less (preferably 100 rpm or less), the shaft reciprocating device 42 simultaneously changes the strength of the upper buffer spring 44. A vertical displacement is applied to the short shaft 43 at about 500 spm or less (preferably 100 spm or less). This shaft reciprocating device 42 can be constructed by known means for moving the short shaft 43 in the vertical direction using a cam, a crank, or the like. As a result, the granules supplied from the hopper 22 to the holding section 25 of the peeling device 11 are
As the rotary disks 30a to 30g rotate, the inclined surfaces 29a, 31a, 29b, 31b, .
...enters between 29g and 31g, and is subjected to all kinds of deforming forces from various directions such as rotation, twisting, polishing, or clamping pressure by both disks between the respective inclined surfaces. Further, the vertical movement width of the rotary disk by the shaft reciprocating device 42 via the buffer spring 44 is about 5D or less, preferably 50m/
It is preferable to design it so that it is less than m.

As a result, the particulate matter passing through the peeling device 11 is divided into a recyclable resin part and a degraded layer with a different Young's modulus due to various deformation forces exerted on it, in other words, a recyclable resin part. The degraded layer, which has become extremely brittle, separates from the recyclable resin portion and peels off. However, in this peeling device 11, the buffer spring 4 supporting the rotating shaft 34 is
4 provides a buffer between the fixed disk and the rotating disk to prevent the granules from being crushed due to excessive deformation, and therefore does not have a crushing effect.

Note that when applying a deforming force to the granular material to peel off the degraded layer, the peeling effect is further improved if the granular material is at a low temperature (room temperature to -50°C). That is, the difference in Young's modulus between the deteriorated layer and the deteriorated layer becomes larger, which facilitates the peeling action. Therefore, in the stripping device 11, a cooling jacket 47 is formed on the peripheral wall of the casing 24, and a cooling medium from a cooling device 48 (FIG. 1) is supplied and circulated to the cooling jacket 47 via a pipe 49. It is configured to cool the casing 24 as a whole, thereby cooling the particulate matter inside.

In this way, the deteriorated layer peeled off from the recyclable resin part becomes powder and is deposited on the bottom of the casing 24 mixed with recyclable resin particles, and the rotating shaft 34 near the bottom A discharge port 51 is opened by a granular material discharging blade 50 which is attached to and rotates.
is discharged from.

The discharge port 51 of the first peeling device 11 is connected to the pneumatic transport pipe 53b via a feed valve 52 having a sealing property such as a rotary valve. One end of this pneumatic transport pipe 53b is connected to the main pneumatic transport pipe 53a, and the other end is connected to the second peeling device 1.
It is open to a cyclone 54 located on the cyclone 2. One end of the main air transport pipe 53a is connected to the air filter 5.
Air is sucked into the pipe through the air filter 55 by operation of a blower 56 which is open to the atmosphere through the air filter 55 and is attached to the main air transport pipe near the air filter 55. The other end of the main air transport pipe 53a is connected to a cyclone 57 disposed above a collection device 14, which will be described later.

As a result, the recyclable resin particles and degraded powder sent from the first peeling device 11 to the pneumatic transport pipe 53b via the feed valve 52 are transported to the cyclone 54 by the air flowing inside the pipe. This cyclone 54 has the same structure as the cyclone 19 disposed above the first stripping device 11.
Therefore, the air flow in the transport pipe 53b is rapidly depressurized in the cyclone 54, and the particulate matter that has flown into the internal chamber from the side wall of the cyclone rotates along the inverted conical wall due to inertia due to its own weight. As a result, only relatively heavy particles fall into the interior of the cyclone 54 below.

On the other hand, the degraded powder that has been pneumatically transported together with the granules is extremely light and therefore floats in the internal chamber of the cyclone 54, and therefore passes through the exhaust pipe 58 connected to the upper part of the cyclone 54 to the pneumatic transport pipe 53b. Together with the sent air, it is sent to the degraded powder collecting device 15, and only the air used there as a conveyance medium is exhausted from the exhaust pipe 60, and the degraded powder is collected.

Next, the particulate matter that has fallen into the lower part of the inner chamber of the cyclone 54 is sent to the second peeling device 12 again. The configuration of this second peeling device 12 is exactly the same as the configuration of the first peeling device 11 described above. Therefore, the casing of the second peeling device 12 is also cooled by the cooling device 61 to facilitate the peeling operation inside. In this way, the deteriorated layer on the surface of the granules that has not yet been peeled off by the first peeling device 11 is further peeled off.
This further improves the peeling rate of granules. The deteriorated powder passed through the second peeling device 12 and peeled off is mixed with granules and transferred to the first peeling device 11.
Similarly, the air is discharged from the discharge port 62 to the pneumatic transport pipe 53c via a supply valve 63 having a sealing property such as a rotary valve. This air transport pipe 53c
One end is connected to the main pneumatic transport pipe 53a, and the other end is connected to the inside of the collision peeling machine 13. Therefore, the degraded powder and granules discharged into the pneumatic transport pipe 53c are transported into the collision peeling machine 13 by the air flow sent through the main pneumatic transport pipe 53a.

As shown in FIG. 6, this collision peeling machine 13 consists of a hollow cylindrical casing 64, and the other end of the pneumatic transport pipe 53c is connected to the side wall of the casing and opens toward the internal chamber. There is. A collision plate 66 is disposed inside the casing 64 so as to face the opening 65 of the pneumatic transport pipe 53c.
is located. A chevron-shaped separation plate 67 is attached to the upper end of this collision plate 66. Furthermore, an exhaust port 68 is formed in the upper part of this casing 64, and an exhaust port 69 is formed in the lower part thereof. This exhaust port 68 is connected to the exhaust pipe 58 as shown in FIG.
On the other hand, the discharge port 69 is connected to the main pneumatic transport pipe 53a via a feed valve 70 having a sealing property such as a rotary valve. As already explained, the downstream end of the main pneumatic transport pipe 53a is connected to the cyclone 57 disposed above the collection device 14 that collects only recyclable particulate matter.

As a result, the deteriorated powder and granules transported to the collision peeling machine 13 by the pneumatic transport pipe 53c fly out into the internal chamber from the opening 65, and only the relatively heavy granules collide with the collision plate 66. . As a result, the degraded layer still attached to the granules is peeled off by the impact, further increasing the rate of removal of the degraded layer from all the granules, that is, the peeling rate. The degraded powder separated by this and the degraded powder transported by the pneumatic transport pipe 53c are sent to the degraded powder collection device 59 together with the air flowing into the exhaust pipe 58 connected to the exhaust port 68. It is supplemented by On the other hand, the collision plate 66
The particles collided with the casing 64 are prevented from scattering upwardly by the separating plate 67, and are deposited at the lower part of the casing. The particulate matter accumulated in the lower part of the casing 64 is detected by two limit switches 70a and 70b provided on the side wall of the casing to detect the maximum and minimum accumulated amounts, and within that range, a rotary valve or the like provided at the discharge port 69 is removed. The gas is discharged into the main pneumatic transport pipe 53a by operating the feed valve 71 which has a sealing property.

The granules discharged into the main pneumatic transport pipe 53a are pneumatically transported to the cyclone 57, but a recycle pipe 72 is connected in the middle of the transport pipe 53a, and the other end of the recycle pipe 72 is connected to a collision peeling machine. 1
It is attached so as to be open to the internal chamber from the wall portion on the opposite side to the transport pipe 53c of No. 3. Therefore, a part of the particulate matter transported to the cyclone 57 by the main pneumatic transport pipe 53a is sent back into the collision stripping device 13 via this recycling pipe 72, and is sent to the tip of the collision plate 66 as shown in FIG. It collides with the opposite surface and the peeling action is repeated.

In this way, the particulate matter finally conveyed to the cyclone 57 is collected at the lower part of the cyclone 57 by the same action as described above. and,
The air that was the conveying medium flows to the degraded powder collection device 59 and is exhausted through the exhaust pipe 58 which is also connected to the upper part of the cyclone.

The particulate matter deposited in the cyclone 57 is only recyclable resin particulate matter that has been separated by peeling off the degraded layer in a state close to 100%, and this is separated by a seal such as a rotary valve installed at the discharge port 73. into the recyclable resin particulate collection device 14 via a feed valve 74 with a special function.

Further, the degraded powder collected in the degraded powder collecting device 15 is fed into a waste product tank 78 via a feed valve 77 by a screw conveyor device 76 provided at the lower part thereof.

In the deteriorated layer separation and collection device A in the embodiment described above, two peeling devices and one collision peeling machine 13 are arranged in series to complete the peeling off of the deteriorated layer of granules. It is not always necessary to use all of these, and in some cases, only one stripping device may be required, or more stripping devices and impact stripping machines than shown in this example may be connected in series. Good too.

As described above, according to the deterioration layer peeling device for synthetic resin molded products of the present invention, the deteriorated layer that has formed on the surface of used synthetic resin molded products can be extremely efficiently and completely peeled off from the resin parts that can be recycled. As a result, even if the peeled degraded powder and the separated resin portion are recycled, the quality of the recycled synthetic resin will not deteriorate because no degraded layer is attached to the resin portion.

[Brief explanation of the drawing]

Fig. 1 is a block diagram schematically showing the entire deteriorated layer separation and collection device including the deterioration layer peeling device for synthetic resin molded products of the present invention, and Fig. 2 shows the deterioration layer peeling device for synthetic resin molded products of the present invention. 3a and 3b are a sectional view and a bottom view showing a fixed disk in the deterioration layer peeling device for a synthetic resin molded product, and FIG. 3c is a longitudinal sectional view shown in FIG. 3a.
Partial sectional view taken along line c-c of 4th
Figures a and b are a top view and a sectional view showing a rotating disk in the deterioration layer peeling device for a synthetic resin molded product, and a fourth
Figure c is a partial cross-sectional view of the rotating disk taken along line c-c in Figure 4a, and Figures 5a, b, c, and d are diagrams showing modified examples of the surface shapes of the fixed disk and the rotating disk. A partial sectional view similar to FIG. 3c or FIG. 4c,
and FIG. 6 is a sectional view schematically showing the collision peeling machine. 11, 12...Synthetic resin molded product deteriorated layer peeling device, 27a-27g...Fixed disk, 28a-28
g...Center opening, 29a-29g...Rough surface, 30
a to 30g... Rotating disk, 31a to 31g... Rough surface, 34... Rotating shaft, 44... Buffer spring, 45...
...worm wheel, 46...worm.

Claims (1)

[Scope of Claims] 1. A fixed disk having an opening in the center and having a rough surface on at least one side, and a rotation center axis that substantially coincides with the center axis of the fixed disk and having a rough surface on at least one side. A rotating disk formed by
a rotating disk in which the rough surface of the rotating disk faces the rough surface of the stationary disk and is spaced apart from each other at a predetermined interval; a buffer device that supports the rotating disk in a vertically movable manner; and a buffer device that rotates the rotating disk. A synthetic resin molded product deterioration layer peeling device including a device. 2. In the deterioration layer peeling device for a synthetic resin molded product described in claim 1, the distance between the rough surface of the stationary disk and the rough surface of the rotating disk is reduced from the inside to the outside in the radial direction of the rotating disk. A device for removing deteriorated layers of synthetic resin molded products. 3. The apparatus for removing degraded layers of synthetic resin molded products as set forth in claim 1 or 2, characterized in that a plurality of fixed disks and rotating disks are arranged in pairs. Molded product deterioration layer peeling device.