JPH0929744A - Foamed resin dissolving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently comminute foamed resin. SOLUTION: A pair of comminuting cutters 46, 48 are arranged in a dissolving tank 12. These cutters 46, 48 are vertically deviated at rotary shafts 50, 52 so that the cutter 48 is disposed at the lower position than the cutter 46, and partly dipped in dissolving liquid 80. The cutters 46, 48 are so formed that a gap (g) is formed between the end rotating locuses projected in the axial central directions of the shafts 50, 52. Large sprockets 62 are fixed to the shaft 50, small sprockets 64 are fixed to the shaft 52, and the driving force of a drive motor 54 is transmitted via a drive chain 66 so that the cutters 46, 48 are rotated at different speeds in the opposite directions. Further, an auxiliary cutter 68 is provided at the lower opposed position of the gap (g) to prevent the drop of a large lump of foamed resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin dissolving device for crushing and dissolving foamed resin such as expanded polystyrene used in packaging materials and the like.

[0002]

2. Description of the Related Art Expanded polystyrene (so-called expanded polystyrene) is a bead-shaped molded pellet to which a foaming agent such as liquefied gas is added at the time of polymerization of styrene, and its volume is increased by heating (about 100 ° C.). It has the property of swelling 50 to 70 times. Then, the bead-shaped molded pellets of expanded polystyrene are compression-heat molded and processed into a packaging material or the like for use.

Expanded polystyrene packaging materials include those called foam styrene (FS) or "molds", and those called polystyrene paper (PSP). FS is a foam in which about 2% of its volume is a resin component and the remaining about 98% is occupied by air, and the foam structure in which air is confined has excellent cushioning properties, heat insulation properties, and sound insulation properties. From the point of view of waterproofness and hygiene, it is used as a cushioning packaging material, a food container, a packaging material for a fish box, a heat insulating building material and the like. On the other hand, PSP is a sheet-like foam body in which approximately 7% of the volume is resin content and the remaining approximately 93% is air, and it has the same characteristics as the former, and is mainly used for food packaging trays. It is used for etc.

As described above, expanded polystyrene is lightweight and has excellent characteristics, and is used in a large amount. Then, conventionally, the used expanded polystyrene is treated as garbage and buried in the ground or incinerated. However, since expanded polystyrene has a very small specific gravity and is bulky even with a small weight, it is necessary to collect used expanded polystyrene due to high transportation costs, environmental problems, and effective use of resources. It is being considered for reuse.

Conventionally, when the expanded polystyrene is reused, the recovered expanded polystyrene is heated by an electric heater or high-temperature oil, or heated and melted by frictional heat to reduce the volume, and then pelletized by a specialist. ing. However, the volume reduction process by heating requires a heat source such as electricity or a petroleum-based heat source, and thus there is a risk of fire. Further, since the resin is heated, an odor is generated, which not only makes the surroundings uncomfortable, but also causes a problem of pollution.

Further, not only paper tapes and adhesives but also molded products and cut products of expanded polyolefin similar to expanded polystyrene are often mixed in the recovered expanded polystyrene. Then, if the above heat reduction is performed in a state in which these foreign substances are mixed, the foreign substances and polystyrene become a lump together, making reuse difficult. For this reason, paper tape and adhesives,
It is necessary to selectively remove foreign matters such as foamed polyolefin, and this separation is generally performed manually, which requires a great deal of labor and time. Further, the expanded polystyrene to be reused is washed with water after removing foreign matters, but a resin mixed with water is not suitable as a recycled resin, so it is necessary to remove water when performing the above heat reduction. .

On the other hand, there has been proposed an apparatus for dissolving expanded polystyrene in a solvent and collecting it (see, for example, Japanese Patent Laid-Open No. 5-2.
No. 63065). In the recovery device described in this publication, the lower part of the container is a liquid storage tank that stores a solvent such as d-limonene, and an input port for inputting a block of expanded polystyrene is formed in the upper part of the container. A crusher for crushing the polystyrene block is arranged immediately below this input port, and after crushing the polystyrene block by the crusher, the crushed product of expanded polystyrene is dropped into the liquid storage tank through the hopper. Then, the solvent is sprayed from the nozzle arranged in the liquid storage tank to the crushed material that is falling to dissolve it, and the volume is reduced.

According to the apparatus disclosed in Japanese Patent Laid-Open No. 5-263065, foreign matter other than expanded polystyrene is not dissolved in the solvent, and dust or water can be easily separated even when mixed in the dissolved polystyrene. It is possible to recover the resin after dissolution with a high recovery rate (about 98%) by separating the solvent and polystyrene. Further, by dissolving the expanded polystyrene in a solvent, the volume can be reduced to about 1/50, and the transportation cost can be reduced when the polystyrene is transported to a reprocessing center or the like. Furthermore, since it can be dissolved and reduced in volume without heating, it is safe without the need to apply external heat,
No offensive odor is generated.

[0009]

By the way, crushing of an elastic body such as expanded polystyrene is generally carried out by shearing, cutting, or a combination thereof, and the recovery device described in the above publication also has two axes horizontally. Using crushers arranged in parallel, the blades provided on each shaft are rotated in opposite directions at different speeds, and the continuous shearing force between the blades is the main crushing force. In such a crusher, generally, blades rotating in opposite directions are engaged with each other, and a gap between both adjacent blades is about the size of a crushed product. However, in a crusher in which blades that rotate in opposite directions are arranged at the same height, a large lump of light polystyrene foam rides over both blades and dances on the blades. In some cases, the crushing part does not get caught in the crushing part and the crushing cannot be performed smoothly. In addition, when a foreign matter exceeding the crushing ability is caught in the crushed portion of the rotating blade, the rotation of the blade is blocked, and it is difficult to remove the foreign matter and restore it. Then, if a motor having a capacity capable of crushing without blocking rotation even when a foreign matter such as a metal piece is mixed is used to ensure the strength of the crusher, the device becomes large and unsatisfactory. It is an economy.

Further, in the conventional apparatus, when the expanded polystyrene is crushed, a squeaky crushing sound is generated due to friction between the blade and the expanded polystyrene, which gives an uncomfortable feeling. Further, when the crushed expanded polystyrene is crushed into fine pieces (for example, about several mm) in order to increase the surface area of the expanded polystyrene to increase the dissolution rate, it is charged, and the charged static electricity may ignite the solvent, which is a dangerous substance 4 class. is there. And, the recovery device described in the publication has a stirrer at the bottom of the liquid storage tank, but the expanded polystyrene dropped into the liquid storage tank floats on the solvent, and it takes time for the polystyrene to dissolve. There is a drawback. Then, in order to increase the dissolution rate of the floating polystyrene, it is necessary to constantly spray the solvent from the nozzle, which complicates the apparatus and increases the operating cost.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object thereof is to enable the foamed resin to be efficiently crushed.

Another object of the present invention is to increase the dissolution rate and reduce the generation of crushing noise.

A further object of the present invention is to reduce the occurrence of troubles caused by the entrapment of foreign matter.

[0014]

In order to achieve the above-mentioned object, a foamed resin dissolving apparatus according to the present invention is provided with a dissolving tank in which a dissolving liquid for dissolving a foamed resin is stored, and a dissolving tank which is arranged in parallel with each other in opposite directions. In a foamed resin dissolving device including a crusher for crushing the foamed resin by a blade provided on each of rotating rotating shafts, the crushing device is arranged in the melting tank, and each rotating shaft of the crushing device The line connecting the lines intersects the horizontal plane. It is desirable that a part of the blade of the crusher is immersed in the solution.

In the crusher, it is desirable that a gap be formed between the rotation paths of the tips of the blades that rotate in mutually opposite directions. Further, in the crusher, an auxiliary blade for preventing the foamed resin block from falling is provided at a position facing the gap between the tip rotation trajectories in the tangential direction of the tip rotation trajectories of the blades rotating in mutually opposite directions in the tangential direction toward the solution. Good. Further, a plurality of blades that rotate in mutually opposite directions are formed in a rectangular plate shape, and a plurality of blades are attached in the axial direction of the rotating shaft, and each blade is arranged so that the rear side in the rotating direction is closer to the center side in the axial direction of the rotating shaft than the front side in the rotating direction. At the same time, it should be installed obliquely to the axis of the rotating shaft. Further, the dissolution tank can be provided with a dissolution amount detection means for detecting the dissolution amount of the foamed resin in the dissolution liquid and outputting a detection signal to the alarm generation means. The dissolution amount detecting means can be configured by a torque sensor provided in a stirrer that stirs the solution, an ammeter that detects a load current of a motor that drives the stirrer, or the like.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a foamed resin dissolving apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view showing the whole of the foamed resin dissolving apparatus according to the embodiment of the present invention.

In FIG. 2, the melting device 10 is a relatively small device that can be installed at a place where foamed polystyrene, which is a foamed resin, is generated in a supermarket, a fish market, an electronic store, or the like, and has a width of 1 m and a depth of 0.8 m, for example. The height is about 1.5 m, and the dissolution tank 12 is provided at the center. The dissolving device 10 is provided with a drive unit described later on one side (left side in FIG. 2) of the dissolving tank 12, and a main switch (not shown), a timer, a forward / reverse rotation changeover switch for a crushing blade, etc. are provided on the other side. The left side cover 14 that covers the drive unit and the right side cover 16 that covers the main switch and the like are attached.
4, 16 and the upper part of the front surface of the dissolution tank 12 are inclined rearward. Also, a plurality of casters 17 are attached to the lower end portion so that the casters 17 can be moved to arbitrary positions.

An input port 18 for inputting expanded polystyrene, which is a foamed resin, is formed in the upper inclined portion of the dissolution tank 12 (see FIG. 1), and the input port 18 has an opening / closing lid 22 having a handle 20. The cover 22 is covered with the open / close lid 22 and can be opened and closed by opening and closing the open / close lid 22 as shown by an arrow 23. The melting apparatus 10 is provided with a pair of doors 24 and 26 that can be opened in a double-sided manner in the lower part of the front surface. By opening the doors 24 and 26, a discharge valve described below that is provided in the lower part of the melting tank 12 is provided. To release the solution in which the expanded polystyrene is dissolved. An opening / closing door 28 for maintaining and inspecting the drive unit is attached to the side surface of the left side cover 14. Further, on the front surface of the right side cover 16, an operation unit 30 for operating the melting device 10 is provided. The operation unit 30 has an operation start button 32 for starting the device, an operation stop button 34 for stopping the operation of the device, and a display lamp 36 for displaying whether or not the device is in operation. In addition, an opening / closing door (not shown) is provided on the side of the right side cover 16 so that the main switch can be turned on and off and the crushing blade can be operated by changing over the normal rotation and reverse rotation of the crushing blade. is there.

As shown in FIG. 1, the melting tank 12 has a shape in which the front bottom plate 37 and the rear bottom plate 39 are inclined so that the central portion thereof becomes lower, and the lower end of the bottom portion of the front side is cut out. And a vertical portion 41 is formed. The melting tank 12 is attached to a frame 38 formed of channel steel or the like. This frame 38 includes front and rear legs 4
0, 42, and the upper tilted beam 44 supported by these legs 40, 42 is tilted from the rear side to the front side of the melting tank 12. The inclined beam 44 serves as a supporting member for supporting the rotary shafts 50 and 52 to which the rotary crushing blades 46 and 48 constituting the crusher arranged in the melting tank 12 are attached. Therefore, the tilt angle of the tilted beam 44 is determined by the positional relationship between the rotary shafts 50 and 52. The inclination angle α of the line connecting the centers of the rotating shafts 50 and 52 with respect to the horizontal plane is
The angle suitable for biting the expanded polystyrene by the crushing blades 46 and 48 attached to 0 and 52 is about 10
A range of degrees to about 30 degrees is desirable, and in the case of the embodiment, about 1 degree.
It is 4.5 degrees.

A drive motor 54 for rotating the crushing blades 46, 48 is fixed to the rear leg portion 42 of the frame 38 via a motor base 56. This drive motor 54
A sprocket 58 is attached to the output shaft of the. An idle sprocket 60 is rotatably provided on the rear side of the inclined beam 44 via a bracket. The large sprocket 62 is attached to the rotary shaft 50,
A small sprocket 64 is fixed to 2. A drive chain 66 is wound between these sprockets 58, 60, 62 and 64, and the sprocket 58, the idle sprocket 60 and the small sprocket 64 are located inside the drive chain 66 forming a closed loop, and the large sprocket is 62 is located outside the closed loop formed by the chain 66. Therefore, the drive chain 66 is hung in an S shape between the idle sprocket 60 and the large sprocket 62, and between the large sprocket 62 and the small sprocket 64. Therefore, when the drive motor 54 rotates in the forward direction, the drive chain 66 rotates counterclockwise in FIG.
The crushing blade 46 rotates clockwise and the crushing blade 48 rotates counterclockwise. That is, the crushing blades 46 and 48 are adapted to rotate in mutually opposite directions and at a higher speed than the crushing blade 46.

Each of the crushing blades 46, 48 is formed in the shape of an elongated rectangular plate, and a plurality of crushing blades are provided in the axial direction of the rotary shafts 50, 52, and the rotary shaft 50 is attached at the mounting position of each blade in the axial direction. , 52 are radially attached to each other at intervals of 90 degrees with respect to the center. The projection loci of the tips of the crushing blades 46 and 48 in the axial direction of the rotary shafts 50 and 52 are arranged so that they do not overlap as shown in FIG. Are arranged so that a gap g is formed between them. This gap g is determined by the size of the expanded polystyrene that is crushed.
It is about 30 mm in order to be crushed to a size of about 50 mm.

At the lower side of the gap g formed by the projected rotation loci of the crushing blades 46, 48, that is, at the position facing the gap g on the side of the tangent of the rotation locus facing the dissolved liquid, the expanded polystyrene passing through the gap g is large. In order to prevent the lumps from falling and to improve the crushability by the crushing blades 46 and 48, an auxiliary blade 68 provided between both sides of the melting tank 12 is arranged. The auxiliary blade 68 constitutes a crusher together with the crushing blades 46 and 48, and is formed in a plate shape, and the rotary shaft 5
It is arranged parallel to the tangent line of the rotation loci of the crushing blades 46 and 48 on the line connecting the centers of 0 and 52.

As shown in FIG. 4 (1), the plate-like crushing blades 46 and 48 are formed in a wedge shape in which the tip side in the direction of rotation is scraped off on one side, and the crushing blades 46 and 48 are foamed. The contact surface pressure when contacting the polystyrene 70 is increased, and the expanded polystyrene 70 is easily broken. The crushing blades 46 and 48 are attached to the rotary shafts 50 and 52 as shown in FIG. 4 (2). That is, the crushing blades 46 and 48 are the blades 46a located at the central portions in the axial direction of the rotary shafts 50 and 52,
The axis line in the thickness direction of 48a is the axis line 7 of the rotary shafts 50 and 52.
The blades 46b, 48b, 46c, 48c on both sides thereof are attached so as to be orthogonal to 2, 74, so that the axes in the thickness direction intersect the axes 72, 74 of the rotary shafts 50, 52 at an angle. It is attached. And the blade 46b and the blade 46c
And the blade 48b and the blade 48c are tilted in different directions, and are obliquely attached to the axis of the rotating shaft so that the rear side in the rotating direction is closer to the center side in the axial direction of the rotating shaft than the front side in the rotating direction. There is. If the inclination angle θ of the crushing blades 46, 48 with respect to the axis lines 72, 74 of the rotary shaft is too small, the effect of moving the expanded polystyrene 70 in the axial direction of the rotary shafts 50, 52 will be small, and will be greater than about 30 degrees. If so, the cutting resistance becomes large, so that it is desirable to set it to about 10 to 20 degrees, and in the case of the embodiment, it is about 15 degrees.
Further, the attachment phases of the crushing blades 46 and 48 are shifted so that the crushing blades 46 and the crushing blades 48 are alternately positioned in the longitudinal direction of the rotating shaft. The distance between the crushing blades 46 and the crushing blades 48 adjacent to each other in the rotation axis direction is about 50 mm in the case of the embodiment, and the expanded polystyrene 70 can be crushed to a size of 50 mm or less. .

Guide plates 76 are provided on both sides of the opening / closing lid 22 for opening / closing the inlet 18 of the melting tank 12 (see FIG. 1).
(See), plays a role of a hopper and a chute when the expanded polystyrene 70 is charged, and prevents the dissolution liquid 80 stored in the dissolution tank 12 and the expanded polystyrene 70 charged from scattering. Further, a chute plate 82 is provided below the charging port 18, so that the expanded polystyrene 70 charged from the charging port 18 can be reliably crushed by both crushing blades 46,
It is designed to fall to the boundary of 48 and to prevent it from going around to the rear side of the crushing blade 48 (front side of the melting tank 12). Further, at the lower portion of the vertical portion 41, which is on the front side of the lower end portion of the dissolution tank 12, a discharge port 84 for extracting the dissolution liquid 80 in which the expanded polystyrene 70 is dissolved is provided. The discharge port 84 is provided with a handle 86 for operating a discharge valve (not shown) that opens and closes the discharge port 84. Further, a drain port 90 that is opened and closed by a handle 88 is provided on one side of the lower end portion of the dissolution tank 12 (see FIG. 2). A filter 92 is provided near the bottom of the center of the dissolution tank 12 to remove undissolved foreign matters such as expanded polystyrene and metal pieces to prevent clogging of the discharge port 80 and valves. There is. This filter 92 is
It may be detachable from the outside of the dissolution tank 12 for easy cleaning.

The gap 96 between the rear side wall 94 of the melting tank 12 and the crushing blade 46 and the gap 98 between the front bottom plate 37 and the crushing blade 48 are made as small as possible.
It is desirable that the polystyrene foam 70 rotating between the crushing blades 46 and 48 sandwiched between 6 and 48 can be removed by the side plate 96 and the front bottom plate 37. Further, the amount of the dissolving liquid 80 stored in the dissolving tank 12 is arbitrary as long as the foamed polystyrene 70 charged does not float above the crushing blades 46, 48, but as shown in FIG. It is desirable that a part thereof be immersed in the solution 80. Then, the dissolving device 10 is grounded, and the expanded polystyrene 70 is in a state where the dissolving liquid 80 is not stored in the dissolving tank 12.
Even if it is crushed, it is desirable to prevent charging due to the generation of static electricity.

In the embodiment configured as described above, after the dissolution liquid 80 such as limonene is injected into the dissolution tank 12 from the charging port 18, the operation switch 32 is switched on and the drive motor 54 is rotationally started in the forward direction. To do. When the motor 54 rotates in the forward direction, the chain 66 rotates in the counterclockwise direction in FIG. 1, the crushing blade 46 rotates in the clockwise direction, and the crushing blade 48 rotates in the counterclockwise direction at different speeds. And the inlet 18
The lumps of expanded polystyrene 70 charged into the dissolution tank 12 from the are bitten by the crushing blades 46 and 48 rotating in mutually opposite directions, and the crushing blades 46 rotating at different speeds,
Particle size 30 to 50 mm due to continuous shearing force received from 48
It is crushed to the size of.

At this time, the crushing blade 46 and the crushing blade 48 are
The expanded polystyrene 7 was thrown in because it was rotating in the opposite direction at different speeds and the position in the height direction was offset.
0 becomes a slant, and the corners of the polystyrene 70 are easily caught by the lower rectangular plate-shaped crushing blade 48.
It is easily bitten between 48. Moreover, the lower crushing blade 4
Since 8 rotates at a higher speed than the crushing blade 46 on the upper side, it plays a role of pushing the expanded polystyrene 70 to the crushing blade 46 side, and the biting property of the expanded polystyrene 70 can be improved.
Further, a large lump of the expanded polystyrene 70 that has passed through the gap g of the rotation loci of both the crushing blades 46 and 48 is prevented from falling into the dissolution liquid 80 by the auxiliary blade 68, and this auxiliary blade 68 and each crushing blade 46, 48. It is crushed into small pieces by. And since a part of the crushing blade 48 is immersed in the solution 80,
The rotation of the crushing blade 48 wets the expanded polystyrene 70 to reduce an unpleasant crushing sound.

Furthermore, since a gap g is formed between the tip ends of the crushing blades 46 and 48 and the projected rotation loci of the rotary shafts 50 and 52 in the axial direction, even if small solid foreign matter is mixed in, No foreign matter is caught between the crushing blade 46 and the crushing blade 48, damage to the blade can be avoided, and the crushed expanded polystyrene 70 easily falls and is not crushed more than necessary. The crushing efficiency can be improved. Moreover, since the crushing blades 46, 48 are attached so as to be inclined with respect to the axis of the rotating shaft so that the rear side in the rotating direction is located closer to the center side in the axial direction of the rotating shaft than the front side in the rotating direction, the expanded polystyrene 70 that has been introduced. The crushing blades 46 and 48 are moved closer to the axial central portions of the rotating shafts 50 and 52 by the rotating crushing blades 46 and 48, and the crushing blades 46 and 48 do not cut the same portion of the expanded polystyrene, and the crushing efficiency can be improved. In addition, in the examples, since the expanded polystyrene 70 is crushed to have a particle size of 30 to 50 mm, static electricity is not generated and there is no risk of ignition of limonene, which is a dangerous substance 4 class.

When a large foreign substance is caught between the crushing blade 46 and the crushing blade 48 and cannot rotate, the operation stop button 34 is pressed to stop the drive motor 54, and then the forward / reverse rotation (not shown) is performed. With the changeover switch set to the reverse rotation side, the operation start button 32 is pressed to rotate the motor 54 in the reverse direction to release the entrapment of foreign matter and then stop the motor 54 to remove the foreign matter.

Crushing blade 48 partially immersed in the solution 80
Stirs the dissolving liquid 80 and forcibly sinks the polystyrene 70 falling on the surface of the dissolving liquid 80 into the dissolving liquid 80 to promote dissolution. Then, the polystyrene 7 having a weight of about 30% of the weight of the dissolution liquid 80 stored in the dissolution tank 12 is used.
If 0 is dissolved, the dissolution rate will decrease and the viscosity of the dissolution liquid 80 will increase, and the load on the drive motor 54 will increase. Therefore, the operation of the dissolution device 10 is stopped and the handle 86 is operated to operate the discharge port 84. And the solution 80 in which the expanded polystyrene 70 is dissolved is transferred to a transport container or the like. Then, after the dissolution liquid 80 in the dissolution tank 12 is extracted, a new dissolution liquid 80 is injected into the dissolution tank 12 and the expanded polystyrene 70 is dissolved in the same manner as described above.

In cold regions, the dissolution tank 12
It is advisable to attach a heater to and heat the solution 80 to facilitate the dissolution of the expanded polystyrene 70. Further, in the above-described embodiment, the foamed resin is the expanded polystyrene 7.
Although the case where it is 0 has been described, the foamed resin may be another resin such as foamed polyolefin.

FIG. 5 shows another embodiment. In this embodiment, the agitator 1 is added to the dissolution tank 12.
00 is provided. In this stirrer 100, a blade 102 is rotated by a motor 104, and the dissolution liquid 8 in the dissolution tank 12 is
0 can be stirred. Further, a torque sensor 108 is attached to the rotating shaft 106 of the stirrer 100 so that the load torque of the stirrer 100 can be detected. Then, the torque sensor 108 serves as a dissolution amount detecting means for detecting the dissolution amount of the expanded polystyrene 70 in the dissolution liquid 80, and the detection signal is the alarm generation device 1.
I'm trying to type in 10.

The alarm generator 110 includes the torque sensor 10
When the detected torque of No. 8 is equal to the torque received by the stirrer 100 when the polystyrene foam 70 having a predetermined value, for example, 30% of the weight of the solution 80 in the dissolution tank 12 is dissolved, an alarm is issued by an alarm. Sound generation and melting device 1
It is designed to automatically stop at 0. This allows
It is possible to automatically detect that a predetermined amount of expanded polystyrene is dissolved, and it is possible to accurately grasp the replacement time of the solution 80. The motor 10 is used instead of the torque sensor 108.
It is also possible to detect the value of the load current supplied to No. 4 and generate an alarm or stop the melting apparatus 10 when this load current reaches a predetermined value.

[0035]

As described above, according to the present invention, the blades rotating in mutually opposite directions are vertically displaced so that the foamed resin can be easily caught and crushed. Further, since a part of the blade is soaked in the dissolving liquid, the frictional resistance between the blade and the foamed resin is reduced by the dissolving liquid, and unpleasant crushing noise during crushing can be reduced. Moreover, since the blades that rotate in opposite directions are arranged so that a gap is created between the rotation trajectories of the tips, small solid foreign objects are caught between the blades and rotation of the blades stops, or the blades rotate. It is possible to eliminate inconveniences such as damage to the resin, and to avoid crushing the foamed resin more finely than necessary, thus improving the crushing efficiency.

The crushing performance can be improved by providing an auxiliary blade at a position facing the gap of the tip rotation loci of the blades rotating in mutually opposite directions to prevent large foamed resin from dropping. Furthermore, the blades that rotate in the opposite direction are formed in a rectangular plate shape, and since the rear side in the rotation direction is closer to the center side in the axial direction of the rotation axis than the front side in the rotation direction, it is attached obliquely to the axis line of the rotation axis. The foamed resin that has been introduced is brought closer to the central portion in the axial direction of the rotating shaft by the rotating crushing blade, and the crushing efficiency of the foamed resin can be improved. Then, the dissolution tank is provided with a dissolution amount detection means for detecting the dissolution amount of the foamed resin, and the detection signal is input to the alarm generation means to generate an alarm, whereby a predetermined amount of the foamed resin is dissolved. This can be detected easily and surely.

[Brief description of drawings]

FIG. 1 is a side view of a melting device according to an embodiment of the present invention.

FIG. 2 is an overall perspective view of the melting device according to the embodiment of the present invention.

FIG. 3 is a front view of the melting device according to the embodiment of the present invention.

FIG. 4 is a detailed explanatory diagram of a crushing blade according to an embodiment of the present invention and a diagram showing an arrangement state.

FIG. 5 is an explanatory diagram of another embodiment of the present invention.

[Explanation of reference numerals] 10 melting device 12 melting tank 46, 48, 68 crusher (crushing blade, auxiliary blade) 50, 52 rotating shaft 54 drive motor 58 sprocket 60 idle sprocket 62 large sprocket 64 small sprocket 66 drive chain 100 stirrer 106 Concentration detection means (torque sensor)

Claims (7)

[Claims] 1. A dissolution tank in which a solution for dissolving a foamed resin is stored, and a crusher for crushing the foamed resin with blades provided on respective rotating shafts arranged in parallel and rotating in mutually opposite directions. In the foamed resin melting device, the crusher is arranged in the melting tank, and a line connecting the rotating shafts of the crusher intersects a horizontal plane obliquely. 2. The foamed resin dissolution apparatus according to claim 1, wherein a part of a blade of the crusher is immersed in the dissolution liquid. 3. The foamed resin melting apparatus according to claim 1, wherein the crusher has a gap formed between the rotation paths of the tips of the blades that rotate in mutually opposite directions. 4. The crusher drops a foamed resin block at a position facing a gap between the tip rotation trajectories in a tangential direction of the tip rotation trajectories of the blades rotating in mutually opposite directions in a tangential direction toward the dissolving liquid. 4. The foamed resin melting device according to claim 1, further comprising an auxiliary blade for blocking the above. 5. The blades, which rotate in mutually opposite directions, are formed in a rectangular plate shape, and a plurality of blades are attached in an axial direction of the rotating shaft, and each blade has a rear side in the rotating direction from an axial line of the rotating shaft more than a front side in the rotating direction. The device is mounted so as to be oblique to the axis of the rotating shaft so as to be on the center side in the direction.
5. The foamed resin dissolving device according to any one of 1 to 4. 6. The dissolution tank has a dissolution amount detecting means for detecting a dissolution amount of the foamed resin in the dissolution liquid and outputting a detection signal to an alarm generating means. The foamed resin dissolving device according to any one of 1 to 5. 7. A dissolving tank in which a dissolving liquid for dissolving the foamed resin is stored, and a dissolving tank provided in the dissolving tank, arranged on a line oblique to the liquid surface of the dissolving liquid, and rotating at different speeds in mutually opposite directions. A pair of rotating shafts, a plurality of plate-shaped crushing blades attached in the axial direction of each of these rotating shafts to crush the foamed resin, and a dissolution amount detecting means for detecting a dissolution amount of the foamed resin in the dissolution liquid. And, having an alarm generating means for generating an alarm or stopping the rotation of the blade based on the detection signal of the dissolution amount detecting means, each crushing blade attached to each rotating shaft has a rear side in the rotation direction. The crushing blades are attached so as to be oblique to the axis of the rotating shaft so as to be closer to the center side in the axial direction of the rotating shaft than the front side in the rotating direction, and a gap is formed between the rotation paths of the tips of the crushing blades rotating in the opposite directions. Is placed in the position An auxiliary blade that prevents the foamed resin block from falling is provided at a position facing the gap between the tip rotation trajectories in the tangential direction toward the dissolution liquid of the tip rotation trajectories of the crushing blades that rotate in mutually opposite directions. A foamed resin dissolving device characterized by: