JPH0788843A - Recycling apparatus - Google Patents

Abstract

PURPOSE:To perform extremely simply and surely exchange of a resin without requiring complicated apparatus and pipe for carrying a ground material by pressure as only cleaning of the inside of a hopper is required when exchange of the resin is performed. CONSTITUTION:On the upper part of a resin introducing inlet 4 of a molding machine provided successively to a plasticizing apparatus 10, a sprue runner feed inlet 1 and a virgin material feed inlet 2 are provided and a hopper 5 with a built-in grinding mechanism 3 is successively provided. A virgin material feeding apparatus 6 is connected with the virgin material feed inlet 2. A sprue runner transfer apparatus 7 is mounted on a mold 9 for molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic raw material recycling apparatus for crushing spools, runners, burrs and the like generated during plastic molding, and mixing the crushed material with a virgin material and supplying it to a molding machine.

[0002]

2. Description of the Related Art As an apparatus for recycling plastic raw materials, for example, the invention described in JP-A-61-188112 is known. The above invention is an apparatus in which a pulverizing / reducing material supply unit and a virgin material supply unit are combined, the materials sent from the respective units are mixed using a mixing / transporting device, and the mixture is transported to a molding machine.

The invention described in Japanese Patent Laid-Open No. 52-62772 is also known. The above invention is an apparatus for crushing an object to be crushed by rotary teeth provided in a housing, and forcibly discharging the crushed pieces from the apparatus through a pipe by air suction force to reuse as a recycled material. .

[0004]

However, in the case of the apparatus disclosed in Japanese Patent Laid-Open No. 61-188112 of the prior art, each unit is washed when the resin is replaced because there are many units. Spends a great deal of time on. The crushed material is intermittently supplied by a blower. Therefore, it is necessary to always hold a fixed amount of the crushed material in the crushed reducing material supply unit, and it is necessary to discard the fixed amount of the crushed material when the resin is replaced. Further, it was necessary to mix the crushed material with the virgin material and purposely send the material to the material input port of the molding machine located above by using the transportation device.

Similarly, in the case of the device disclosed in Japanese Patent Laid-Open No. 52-62772, similarly, the pulverized material is semi-forcedly discharged through the pipe by the air suction force, and the pulverized material is introduced into the material inlet of the molding machine above. It needs to be pumped. However, the resin that has entered the tube tends to adhere to the inner wall due to static electricity or the like. Therefore, when changing the material, the resin in the pipe must be completely removed, but it is extremely difficult to completely remove it, and there is a problem that it becomes a dedicated machine for one type of resin in practice. there were.

Therefore, the present invention was developed in view of the above-mentioned drawbacks of the prior art, and it is extremely easy and wasteful to change the resin of the molding machine, and moreover, the resin of the crushed material can be surely changed. It is another object of the present invention to provide a recycling device that can surely feed a crushed material into a material input port of a molding machine without using a complicated device.

[0007]

SUMMARY OF THE INVENTION The present invention is to recycle a plastic raw material, which is obtained by crushing spools, runners, burrs and the like generated during plastic molding, and mixing the crushed product with a virgin material and supplying the mixture to a molding machine. In the device, a hopper having a spool / runner charging port and a virgin material charging port, having a crushing mechanism built therein and installed above the resin charging port of the molding machine, and a virgin material supplying device for supplying the virgin material to the hopper, And a spool / runner transfer device for transferring the molded spool / runner portion from the mold to the hopper.

FIG. 1 is a conceptual diagram showing the present invention. A molding die 9 and a plasticizing device 10 are mounted on the molding machine 8. A molding resin injection port 4 is connected to the plasticizing device 10. Above the resin injection port 4 of the molding machine, a hopper 5 having a spool / runner injection port 1 and a virgin material injection port 2 and having a crushing mechanism 3 built therein is connected. A virgin material supply device 6 for supplying the virgin material to the hopper 5 is connected to the virgin material inlet 2. On the other hand, the molding die 9 is provided with a spool / runner transfer device 7 for transferring the formed spool / runner portion from the molding die 9 to the hopper 5.

In the apparatus configured as described above, the spool / runner portion discharged from the molding die 9 at the time of molding is loaded into the spool / runner loading port 1 by using the spool / runner transfer device 7. The loaded spool / runner portion is crushed by the crushing mechanism 3 built in the hopper 5, and falls as a crushed material toward the resin injection port 4 of the molding machine. On the other hand, the virgin material supplying device 6 intermittently supplies the virgin material into the hopper 5. Then, the virgin material and the crushed material are mixed inside the hopper, and the mixed material thus mixed enters the plasticizing device 10 through the resin inlet 4 of the molding machine.

[0010]

Embodiment 1 FIGS. 2 to 4 show the present embodiment, FIG. 2 is a longitudinal sectional view, FIG. 3 is a sectional view taken along the line AA ′ of FIG. 2, and FIG. 4 is an enlarged side view of a crushing cutter. is there. Reference numeral 11 denotes a recycle hopper, which has a crushing mechanism 12 incorporated therein and is fixed to an upper portion of a plasticizing device 23. The crushing mechanism 12 is composed of a crushing cutter 13 and a motor 14 for rotating the crushing cutter 13. The cutting edge of the crushing cutter 13 has an edge shape, and the gap between adjacent teeth is large enough to accommodate one or two pellets (FIGS. 3 and 4).
reference). A spool / runner charging port 15 is provided above the crushing mechanism 12.

A virgin material hopper 16 is fixed to the upper portion of the recycling hopper 11. Further, there is a resin supply control shutter 17 in a portion where the resin falls from the virgin material hopper 16 into the recycling hopper 11. This resin supply control shutter 17 is a cylinder 18
Can be opened and closed freely. The operation of the cylinder 18 receives the signal from the resin amount detection sensor 19 and the controller 2
It is performed by the signal output from 0. On the other hand, a spool / runner take-out robot 22 is fixed to the upper surface of the platen 21 on the stationary side of the molding machine. The spool / runner take-out robot 22 is configured to hold a spool / runner portion discharged from a molding die at the time of plastic molding, and to insert the spool / runner portion from the spool / runner input port 15.

In the apparatus having the above-described structure, the spool / runner portion discharged from the molding die during plastic molding is loaded into the spool / runner loading port 15 by the spool / runner take-out robot 22 every cycle. The loaded spool / runner is crushed by a crushing cutter 13 which has a blade edge of a crushing mechanism 12 incorporated in a recycle hopper 11 and has an edge shape and is constantly rotating, and falls as a crushed material toward a molding resin charging port. And mix with virgin wood. When the amount of resin in the recycling hopper 11 becomes small due to molding, the resin amount detection sensor 19 detects it and sends a signal to the controller 20, and the signal output from the controller 20 causes the cylinder 18 to operate for a certain period of time.

By the operation of the cylinder 18, the resin supply shutter 17 is released for a fixed time, and a fixed amount of virgin material is supplied from the virgin material hopper 16 into the recycle hopper 11. The virgin material and the crushed material are mixed inside the hopper, and the mixed material thus mixed enters the plasticizing device 23 through the resin injection port of the molding machine. When adjusting the mixing of the crushed material and the virgin material, the movement of the spool / runner take-out robot 22 may be controlled and the spool / runner portion may be discarded once every plural times.

According to this embodiment, since the spool / runner portion generated in each cycle is crushed every time, the mixing ratio with the virgin material can be kept constant even without complicated equipment. . In addition, since the cutting edge of the crushing cutter 13 has an edge shape, the cutting edge easily bites into the spool / runner portion, and the generation of powder due to abrasion is small. further,
1 to 2 gaps between adjacent teeth of the crushing cutter 13
The size of the crushed material is uniform and almost the same size as the virgin material because the pellets are placed in such a size.

Although the spool / runner take-out robot 22 is used as a device for transferring the molded spool / runner portion in the present embodiment, the present invention is not limited to this, and for example, it may be transferred by a belt conveyor or the like. You may.

[0016]

Embodiment 2 FIGS. 5 and 6 show this embodiment, FIG. 5 is a longitudinal sectional view, and FIG. 6 is a graph showing the relationship between temperature and bending elastic modulus. The present embodiment is different in that a heating air generator is provided on the upper surface of the recycle hopper 11 in the first embodiment, and the other components are the same, and the same components are designated by the same reference numerals. The description is omitted.

On the upper surface of the recycle hopper 23, a heated air generator 25 capable of sending heated air is fixed. The heating air generator 25 includes a fan 26 that blows air, a motor 27, and a heater 28 that heats the air.
And a filter 29 for removing dust in the air and an air supply hole 30. The space above the crushing mechanism 24 is always kept at a high temperature by the heated air generator 25.

The operation of the device configured as described above will be described below. The spool / runner part discharged from the mold during plastic molding comes into contact with the outside air and begins to cool from the surface layer. When cooled, the viscosity decreases and conversely the flexural modulus increases (see Figure 6). If the spool / runner portion is crushed with a cutter in this state, breakage occurs and many small powdery powders are generated. If a large amount of powder is mixed in the crushed particles, the resin supply to the plasticizing device of the molding machine will not be uniform.

In this embodiment, the space above the crushing mechanism is always kept at a high temperature by the heated air generator 25. Therefore, the surface layer of the spool / runner portion can be crushed without being cooled. For example, in the case of PMMA resin, the temperature is 90 to 100 ° C, and in the case of PC resin, it is 90 ° C.
Heat to ~ 130 ° C. The inside of the spool / runner is just taken out from the molding die, and is still hot. Since the spool / runner portion is crushed in a state where the bending elastic modulus is small in a high temperature state, breakage hardly occurs, and generation of powder during crushing can be extremely reduced.

According to this embodiment, no powder is generated when the spool / runner portion is crushed.

[0021]

Third Embodiment FIG. 7 is a vertical sectional view showing the present embodiment. In the present embodiment, only the points different from the first embodiment will be described, the same components will be assigned the same reference numerals, and description thereof will be omitted. In this embodiment, the crushing mechanism 30 built in the recycle hopper 34 is installed lower than in the first embodiment, and the virgin material and the spool / runner portion can be crushed at the same time. Further, the spool / runner inlet 33 is provided on the side surface of the recycle hopper 34 so that the spool / runner take-out robot 22 can be used to insert the spool / runner portion from the side surface.

The apparatus having the above structure simultaneously grinds the virgin material and the spool / runner portion.

According to this embodiment, since the virgin material and the spool / runner portion are crushed at the same time, both can be mixed uniformly. Further, when changing the resin, the inside of the recycle hopper 34 including the crushing mechanism 30 can be washed simply by introducing new resin from the virgin material hopper 35. Furthermore, since the spool / runner portion is inserted from the side surface, it is possible to reduce dust and foreign matter from entering from above.

[0024]

As described above, according to the recycling apparatus of the present invention, the spool / runner portion is put into the hopper as it is, and the crushed material is crushed inside the hopper to make the crushed material. It does not require complicated equipment or pipes for pumping. Therefore, when changing the resin, it is only necessary to clean the inside of the hopper, and the resin can be changed very easily and reliably. Further, it is not necessary to store a large amount of crushed material, and it is possible to extremely reduce the amount of resin to be discarded when changing the resin.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the present invention.

FIG. 2 is a vertical sectional view showing the first embodiment.

FIG. 3 is a sectional view taken along the line AA ′ of FIG.

FIG. 4 is a side view showing the first embodiment.

FIG. 5 is a vertical sectional view showing a second embodiment.

FIG. 6 is a graph showing Example 2.

FIG. 7 is a vertical sectional view showing a third embodiment.

[Explanation of symbols]

 1 Spool / runner input port 2 Virgin material input port 3 Grinding mechanism 4 Molding machine resin input port 5 Hopper 6 Virgin material supply device 7 Spool / runner transfer device 8 Molding machine 9 Mold 10 Plasticizing device

Claims (1)

[Claims] Claim: What is claimed is: 1. A spool / runner charging port and a virgin for a plastic raw material recycling apparatus for crushing spools / runners, burrs, etc. generated during plastic molding, and mixing the crushed material with a virgin material to supply the molding machine. A hopper that has a material input port and has a built-in crushing mechanism installed above the resin input port of the molding machine, a virgin material supply device that supplies the virgin material to the hopper, and a molded spool / runner part A recycle device having a spool / runner transfer device for transferring the spool to the hopper.