JPH09141119A - Foamed styrol crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent static electricity generated in crushing of a foamed styrol material and finely grinding the foamed styrol material to facilitate the collec tion of a foamed styrol powder. SOLUTION: In a foamed styrol powder crusher 1 equipped with a cutting means 3 cutting and crushing a foamed styrol material 9, earth 12 and a collection part 5 collecting the cut and ground foamed falling styrol powder in order to prevent the electrostatic charge of the foamed styrol powder 11, a voltage generation means 2 applying negative voltage to at least the cutting means 3 and the desired place of the periphery thereof is provided. The negative charge by static electricity of the ground foamed styrol powder 10 is removed by neutralizing and removing positive charge by the negative voltage of the voltage generation means 2 by the earth 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Styrofoam crusher used for the treatment of waste or the reuse of Styrofoam materials.

[0002]

BACKGROUND OF THE INVENTION Styrofoam is widely used as a packaging container for fresh foods, and various devices for treating and recycling the waste have been proposed. Styrofoam cannot be burned as it is for disposal because it produces toxic gas when burned. Therefore, it is usually attempted to dispose or reuse styrofoam after it is shrunk or melted by crushing or heating.

Conventionally, a Styrofoam crusher is equipped with a cutting tool composed of a saw blade-shaped rotary cutter or the like, and a method of cutting the Styrofoam material into fine powder particles is employed. . Since the styrofoam material has a large volume, it is required to be pulverized as finely as possible for the convenience of handling. For that purpose, it is necessary to make the eyes of the cutter as small as possible and increase the friction between the cutter and the expanded polystyrene material.

However, by making the cutter finer,
When the friction during cutting is increased, the crushed Styrofoam powder is charged by static electricity and adheres to the cutter and the inner wall of the device, which complicates the subsequent Styrofoam powder recovery work and eventually hinders the rotation of the rotary cutter. There was a problem.

As one of the methods for avoiding this, there is known a method of making the cutter coarse so that static electricity is not generated and melting and reducing the cut coarse styrene foam crushed pieces by a separate high temperature heat treatment apparatus. Has been. But,
Such a heat treatment device requires an expensive plant, and thus is extremely expensive.

Therefore, in order to reduce the electrostatic charge of the Styrofoam powder, a method of grounding the crusher to remove the electrostatic charge has been proposed.

[0007]

However, although the negative charge can be removed by simply grounding the crusher, the positive charge cannot be removed. In other words, electrostatic charging causes both positive and negative polarities to be mixed, or only one of the polarities is unevenly distributed.Therefore, there is a problem that adhesion of Styrofoam powder cannot be avoided without fail by removing negative electrostatic charges. It was

Therefore, as a method for surely removing and neutralizing the bipolar charges, for example, a device that can spray an electrolyte solution on a cutting tool, that is, a device that sprays an ion shower, or an ion is generated by corona discharge. It is known that a device for blowing the styrofoam powder to the styrene foam powder is further provided.

However, in the apparatus for spraying the ion shower, since the aqueous solution which is the ion shower is sprayed to the styrofoam cutting portion of the cutting tool in a state where the styrofoam powder surface is melted by the frictional heat of cutting, the styrofoam cut is cut. There arise problems that the powder is rapidly cooled, aggregated and solidified and adhered to the cutter, and further the rotary cutter is broken.

Further, in the device for blowing the ions, although the Styrofoam powder is somewhat prevented from adhering to the cutter portion of the cutting tool where the ions are blown, the powder scatters and attaches to the surrounding housing or the like. Therefore, the actual situation is that work efficiency is unavoidable. The present invention focuses on the above-mentioned problems, and can effectively remove the bipolar charges on the Styrofoam powder due to static electricity, and at the same time, achieve a process associated with the disposal or reuse of Styrofoam at low cost. The purpose is to provide.

[0011]

According to the present invention, a styrofoam crusher having a cutting means for cutting / crushing styrofoam material and a collecting part for collecting the cut / crushed styrofoam powder by dropping, Grounding means for preventing negative charging due to static electricity to the Styrofoam powder that is generated, and voltage generating means for applying a negative voltage to at least the cutting means and a desired position around it in order to prevent positive charging are provided. A styrofoam crusher is provided.

In the present invention, the Styrofoam material to be treated includes small-sized ones for food packaging in supermarkets to medium-sized ones for displaying fish and shellfish and meat, and also for fixing electric appliances packaging such as refrigerators and TVs. Any of the large ones such as can be targeted.

As the cutting means, a known one in which a plurality of saw blade-shaped rotary cutters or the like are combined can be used. Particularly, even if the cutter has a fine mesh, static electricity can be sufficiently prevented and it can be used. be able to.

The collecting unit for collecting and collecting the Styrofoam powder is, for example, a box body which can be detached from the crusher.
It may be arranged at a location where the expanded polystyrene powder cut by the cutting means falls, that is, below the cutting means. In this collecting part, for example, shrinking / dissolving liquid of existing styrofoam such as citrus starch, limonene, methylene chloride, etc. is introduced to shrink / foam styrofoam powder.
It can be dissolved. For this reason, the material of the collecting portion may be one that can withstand this, or one that is laid with a sheet having chemical resistance and heat resistance so that it is easy to collect the expanded and contracted / dissolved polystyrene foam. Further, a heating means such as a heating wire or a sheet-like heat generating sheet having a far infrared ray irradiation carrier such as carbon fiber or carbon black can be arranged at the bottom of the collecting portion. By disposing such a heating means, it is possible to convect the contracting / dissolving liquid in the collecting portion and to carry out the contact reaction with the expanded polystyrene powder substantially uniformly.

The grounding means electrically connects the device and the ground, and is a known grounding device which is usually used for preventing electric leakage in a machine tool, for example. In the styrofoam crusher of the present invention, in addition to the above-mentioned leakage prevention, it is also used for the prevention of negative electrification due to static electricity on the styrofoam powder.

As the voltage generating means, any means that can generate a DC voltage can be applied, but the AC power that is normally supplied to the house / factory is converted to DC power by a known circuit technique such as a transformer and used. Is preferred. However, the preferred range of the negative voltage applied to the device is 2,000 to 3
Since it is 1000 volts, the known circuit is required to be able to achieve this sufficiently.

This negative voltage is at least the cutting means in order to prevent the cut styrofoam powder from being positively charged by static electricity to prevent the adhesion to the cutting means and the surrounding housing. And it is necessary to apply it to a desired portion around it.

In the crusher of the present invention, a solution for shrinking / dissolving the styrofoam powder with respect to the styrofoam powder that has been cut and crushed by the cutting means and before being dropped and collected in the collecting section, That is, it is possible to provide a solution spraying means capable of spraying the existing shrinkage / dissolution solution. As such a solution spraying means, a nozzle type sprayer equipped with a gear pump or the like can be adopted. The Styrofoam powder cut in this way is sprayed with a contracting / dissolving solution before it falls into the collecting section, and this contracting / dissolving solution is usually an electrolyte solution in an ionized state. (Electrification to the extent of adhering to the cutting means has already been prevented by the voltage generating means and the earthing means)
The contracting / dissolving liquid can be efficiently brought into contact with each other, and the contact reaction between the expanded polystyrene powder and the contracting / dissolving liquid in the collecting part can be improved.

[0019]

In the styrofoam crusher of the present invention, the styrofoam material is cut by the cutting means, and a negative voltage is applied by the voltage generating means so as to prevent particularly positive electrification from static electricity generated by friction during the cutting. To do.

As a result, the negative charge of the Styrofoam powder can be removed by the grounding means, and the positive charge of the Styrofoam powder can be removed by the voltage generating means. It does not adhere to the surrounding housing, etc., but falls into the collection unit.

[0021]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view of a styrofoam crusher 1 according to the present invention. The styrofoam crusher 1 mainly includes a housing 8 made of a conductive material, and a ground 12 for grounding the housing 8.
A high voltage generator 2 that keeps a desired location in the housing 8 at a negative high potential, two rotary cutters 3 that cut and crush the expanded polystyrene material 9, and a feed for reliably feeding the expanded polystyrene material 9 to the rotary cutter 3. It is composed of a device 4 and a collector 5 for collecting the crushed Styrofoam powder 11.

The housing 8 is provided with an introduction port 10 above which the foamed stilose material 9 is introduced into the housing. The ground 12 is a known grounding device. The high voltage generator 2 is a device for generating a high DC voltage by a well-known circuit configuration, and the negative terminal of the voltage is made of a conductive material so that a negative voltage is applied to the entire housing 8. Is connected to the outer wall of the housing 8. On the other hand, the positive terminal is open. The voltage is preferably several thousand volts, but the power (current) is extremely small in order to prevent leakage and the like.

The rotary cutter 3 is formed by arranging a plurality of circular saw blade-shaped cutters 3a at predetermined intervals around the rotary shaft along the rotary shaft direction. The cutters 3a are alternately arranged so that the arcs of the cutters 3a intersect each other. In addition, on the surface of each cutter 3a,
By providing multiple holes in advance, cutting resistance is reduced and
It is possible to prevent the blade from clogging with styrofoam powder.
Further, the rotary cutter 3 may be provided with a torque limiter (not shown) in order to prevent a failure due to clogging or the like.

The feeding device 4 is a device for feeding the styrofoam material 9 provided above the rotary cutter 3, and four square members 4a are erected on the rotary shaft 4b as shown in the drawing. The collector 5 is a box body having chemical resistance and heat resistance that collects the Styrofoam 11 that is crushed by the rotary cutter 3 and that is falling. The infrared sensor 5a and the pressure that detect the collected amount of the Styrofoam are collected. The sensor 5b is provided. An existing heater 7 composed of a heating wire is arranged on the bottom surface of the collector 5.

On the side surface of the housing 8 located between the rotary cutter 3 and the collector 5, styrofoam powder 1 is provided.
A solution sprayer 6 capable of spraying a shrinkage / dissolution solution for shrinking / dissolving 1 is provided. The solution sprayer 6 drops the existing Styrofoam shrinking / dissolving liquid into the Styrofoam powder 11 in the collector 5 after cutting and crushing the collected Styrofoam powder 11 in the collector 5 by a flexible nozzle equipped with a gear pump and the like before collecting the solution. It is an apparatus configured so that it can be sprayed toward the expanded polystyrene powder 11.

Next, the process of treating styrofoam using the crusher 1 will be described. The Styrofoam material 9 is introduced from an inlet 10 on the upper surface of the housing 8 and is fed to an intersecting portion 3b of the two rotary cutters 3 by being wound by a feeding device 4 which rotates inward together by a drive source (not shown).

The two rotary cutters 3 rotate inwardly at different rotational speeds respectively, and sandwich the styrofoam material 9 fed in at the intersecting portions 3b and crush or crush it. The rotational speeds of the rotary cutters 3 are made different from each other because it is difficult for the expanded polystyrene material 9 to pass through the intersecting portions 3b of the two rotary cutters 3 and the expanded polystyrene material 9 is finely ground. At this time, a frictional force is generated between the rotary cutter 3 and the styrofoam material 9, and the crushed styrofoam powder 11 is charged with positive or negative charges due to static electricity, and the styrofoam powder 11 is surrounded by the surrounding housing 8 It may be attached to the rotary cutter 3 or the like.

However, since the conductive housing 8 is grounded by the ground 12 and also connected to the negative terminal of the high voltage generator 2 and a high negative voltage is applied, negative charge due to static electricity is not generated. By the ground 12, the positive charge is effectively removed and neutralized by the negative high voltage, and the Styrofoam powder 11 is prevented from being charged. The rotary cutter 3 is also electrically connected to the negative high voltage of the high voltage generator 2 through the bearing and the housing 8 and the charge is similarly removed.

By making it possible to sufficiently prevent such electrostatic charge, it is possible to easily prevent even static electricity generated when the styrofoam material 9 is finely pulverized by making the cutter's eyes considerably fine. can do. The Styrofoam powder 11, which is prevented from being charged by static electricity, falls onto the collector 5 without adhering to the surrounding housing 8 or the like.

Styrofoam powder 1 dropped on the collector 5
The contracting / dissolving liquid is sprayed onto the nozzle 1 from the flexible nozzle of the solution sprayer 6. When the spraying is completed to some extent, the flexible nozzle is automatically controlled to a substantially horizontal position, and the contracting / dissolving liquid is sprayed onto the expanded polystyrene powder 11 before falling into the collector 5. The control of this flexible nozzle can be appropriately performed according to the capacity of the collector and the collection amount of the expanded polystyrene powder 11. Since the collecting / dissolving liquid is an electrolyte solution, when it is sprayed onto the styrofoam powder 11 before it falls into the collector 5, it partially adheres to the styrofoam powder 11 where some electrostatic charge remains and drops. After that, the contraction in the collector 5 and the contact reaction with the solution are promoted. The shrinkage / dissolution reaction of the expanded polystyrene powder 11 in these collectors 5 may decrease as the amount of expanded polystyrene powder collected increases. Therefore, after a certain amount of collection is performed, the heater 7 heats the collector 5 from the bottom side. This heating causes convection of the liquid substance or suspension in the collector 5, and also raises the reaction temperature to accelerate the shrinkage / dissolution reaction of the expanded polystyrene foam. The temperature control at this time can be appropriately set according to the type of the collected / dissolved liquid.

Two sensors 5a, 5 provided on the collector 5
b can detect the amount of Styrofoam powder in the collector 5 and notify the surroundings by issuing an alarm if an abnormality occurs, so that the operator does not worry about the overflow and is safe. You can proceed with your work in mind.

The styrofoam material 9 is
The maximum size can be about 1/50 of the original size.
The final product can be discarded as is,
It can also be reused. It is also possible to use it as a mixing material for building materials without changing the size of the solution and spraying the solution.

[0033]

The styrofoam crusher of the present invention is provided with the grounding means for grounding the crusher, and the voltage generating means capable of applying a negative voltage to at least the cutting means and a desired portion around the cutting means. About the electrostatic charge of the Styrofoam powder generated by the friction during pulverization, especially the friction during pulverization for the purpose of fine pulverization, the negative charge is due to the grounding means, the positive charge is due to the negative voltage by the voltage generating means. Each can be neutralized and removed. Since the bipolar charges can be effectively removed, it is possible to reliably prevent the Styrofoam powder from adhering to the cutting means or the housing, enable fine pulverization, and easily collect the Styrofoam powder.

After cutting and crushing by cutting means,
Styrofoam that is partially charged by static electricity is further provided with a solution spraying unit that can spray a solution that shrinks and dissolves the Styrofoam powder before it is dropped and collected in the collecting unit. It is possible to efficiently attach the contracting / dissolving liquid to the powder 11 and accelerate the contact reaction with the contracting / dissolving liquid in the collector after dropping. Further, by providing a heating means on the bottom surface of the collecting part, the liquid substance and the suspension substance in the collector are convected, and the reaction temperature rises to further accelerate the shrinkage / dissolution reaction of the expanded polystyrene particles.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a Styrofoam crusher of the present invention.

[Explanation of symbols]

 1. Styrofoam crusher 2. High voltage generator 3. Rotary cutter 3a. Cutter 5. Collector 6. Solution atomizer 7. Heater 8. Housing 9. Styrofoam material 11. Styrofoam powder 12. Earth

Claims (3)

[Claims] 1. A styrofoam crusher equipped with a cutting means for cutting / crushing styrofoam material and a collecting section for collecting the cut / crushed styrofoam powder by means of static electricity on the styrofoam powder generated during cutting. A styrofoam crusher comprising: grounding means for preventing electrostatic charge; and voltage generating means for applying a negative voltage to at least the cutting means and a desired portion around the cutting means to prevent positive electrostatic charge. 2. After cutting and crushing by the cutting means,
2. Styrofoam crushing according to claim 1, further comprising solution spraying means for spraying a solution for shrinking / dissolving the Styrofoam powder to the Styrofoam powder before being dropped and collected in the collecting unit. Machine. 3. The expanded polystyrene crusher according to claim 1, wherein a heating means is provided at the bottom of the collecting section.