JP2002370072A - Specific gravity separation type continuous masher and specific gravity separation type recovery vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous washer that does washing and specific gravity separation of objects-to-be-washed. SOLUTION: A spiral plate for transferring the objects-to-be-washed is installed along the inner wall of a wash drum, so that wash drum has a plurality of washing baths therein. At least one spiral plate between the washing baths is a double spiral plate having a double structure. A notch for discharging light objects from the wash drum by overflow is formed on the discharge side of the double spiral plate. An opening for discharging the light objects, discharged from the notch, to the outside of the wash drum is installed in the contact surface of the double spiral plate and the wash drum. A washing liquid that is separated and recovered from the mixed materials discharged from the first washing bath and the opening is supplied to the washing baths excluding the last washing bath as a recycled liquid. A recovery vessel supplies a liquid therein to the washing baths excluding the last washing bath as a recycled liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous washing machine and a recovery tank used for removing dirt and the like in a recycling process of PET bottles and the like.

[0002]

2. Description of the Related Art Generally, a PET bottle is washed in a PET bottle recycling process as follows. First, a PET bottle is crushed into small pieces by a crusher and transferred to a washing device. Subsequently, a small piece such as a label lighter than PET (polyethylene terephthalate), which is a material of the PET bottle, is separated from the crushed small pieces in which the small pieces of the PET bottle main body, the cap, and the heat shrink label are mixed.
Further, after this separation step, PET small pieces are washed,
After the washing, a dehydration process by a dehydrator and a drying process by a dryer are sequentially performed.

[0003]

However, in the case of cleaning a PET bottle as described above, since one apparatus is required for each process, there is a problem that a large facility cost is required to perform all the processes. . Also, since small pieces must be transferred between devices, it takes time to transfer,
As a result, there is a problem that the entire processing time is required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to clean small pieces and simultaneously
It is an object of the present invention to provide a specific gravity separation type continuous washing machine and a specific gravity separation type recovery tank that can accurately separate small pieces of ET from lightweight materials.

[0005]

In order to achieve the above object, a specific gravity separation type continuous washing machine of the present invention has a hollow cylindrical washing drum for washing an object to be washed, and a washing liquid discharged from the washing drum. A separation tank for separating and recovering the cleaning liquid from the mixed and discharged matter of the material and the light-weight material; A washing tank having a plurality of washing tanks, wherein a spiral spiral plate for transferring an object to be washed is provided on the inner wall of the washing drum. At least one of the spiral plates is a double spiral plate having a double structure, and a surface on the discharge port side of the double spiral plate is used to discharge a light-weight material from the cleaning drum by overflow. And a contact portion between the double spiral plate and the cleaning drum is provided with an opening for discharging the lightweight material discharged from the notch to the outside of the cleaning drum. Supplies the washing liquid separated and collected from the first washing tub and the mixed effluent discharged from the opening to a washing tub other than the last washing tub as a reused liquid, and the recovery tub is provided with water in the tub. Is supplied to a cleaning tank other than the last cleaning tank as a reused liquid.

The second characteristic of the continuous washing machine of the specific gravity separation type according to the present invention is that the washing drum is provided with a window that opens and closes on each side of the washing tank.

Further, the specific gravity separation type recovery tank of the present invention comprises a means for recovering a light-weight material from the mixed recovered material, a means for transporting the object to be cleaned from which the light-weight material has been separated and removed, to a next step,
One of a partition plate that divides the tank so that water can flow at the bottom part, and a winged rotating body that is rotated in the water by a driving device, and drains from the tank by the operation of the pump. The third feature is that the gas is supplied again into the tank.

Further, the specific gravity separation type recovery tank of the present invention comprises a means for recovering a lightweight material from the mixed recovered material, a means for transporting the cleaned object from which the lightweight material has been separated and removed to the next step,
And a gas supply device for injecting gas into water from the bottom of the recovery tank.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the specific gravity separation type continuous washing machine of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an overall configuration diagram of a specific gravity separation type continuous washing machine of the present embodiment, and FIG. 2 is a diagram showing that a notch is provided on one side surface of a spiral plate.

<Construction of Specific Gravity Separation Type Continuous Washing Machine> As shown in FIG. 1, a specific gravity separation type continuous washing machine 1 of this embodiment comprises a hollow cylindrical cleaning drum 2 for cleaning an object to be cleaned, and the cleaning drum. 2 includes a separation tank 3 for separating the washing liquid discharged from the overflow and the light-weight material by overflow, and a recovery tank 4 for collecting the cleaning target discharged from the cleaning drum 2. The cleaning drum 2 is provided with a driving device (not shown) for driving the drum 2 to rotate intermittently alternately in both left and right directions about a central axis within a fixed rotation angle range.

A hollow shaft 5 is provided inside the cleaning drum 2 along the central axis of the cleaning drum 2. The hollow shaft 5 is for supplying a new cleaning liquid, a reuse liquid, a detergent, and steam to each of the washing tubs 7a to 7f as described later.

The inner wall of the cleaning drum 2 is provided with a spiral spiral plate 6 for transporting an object to be cleaned, and the spiral plate 6 also serves as a partition plate to perform cleaning. Drum 2 has six washing tubs 7a-7
f. Here, the spiral plate 6 is formed integrally with the hollow shaft 5. In this embodiment, six cleaning tanks 7a to 7f are used.
Is provided, but the number of washing tanks is not limited to this.

Further, in the washing drum 2, the washing tank 7
a, a small piece of the crushed object
The cleaning tank 7f is provided with an outlet 9 for discharging small pieces transferred from the cleaning tank 7a to the collection tank 4.

Here, in the cleaning drum 2 configured as described above, the spiral plate between the cleaning tanks 7a and 7b and between the cleaning tanks 7c and 7d has a double structure as shown in FIG. A cage (hereinafter, referred to as a double spiral plate 6a), a cleaning tank 7b side of the double spiral plate 6a and a cleaning tank 7d.
A notch 10 is provided in the side plate as shown in FIG. An opening 6b is provided on the surface where the double spiral plate 6a and the cleaning drum 2 are in contact. The position where the notch 10 is provided and the number, size, shape, and the like of the notch 10 can be appropriately set in consideration of the size of the small pieces.

The cleaning tank 7 is provided between the cleaning tanks 7b and 7c.
A punching plate (not shown) is provided on the spiral plate 6 between d and 7e and between the cleaning tanks 7e and 7f, and between the cleaning tanks 7b and 7c and between the cleaning tanks 7d to 7f. Then, the cleaning liquid flows.

The separating tank 3 is connected to a washing tank 7a, and is configured so that the light-weight material and the washing liquid discharged from the washing tank 7a are recovered by the separating tank 3. Further, the separation tank 3 is configured to collect the light-weight material and the cleaning liquid discharged from the openings 6b of the two double spiral plates 6a. The separation tank 3 is provided with a screen 3a through which only the cleaning liquid passes, and the light-weight material and the cleaning liquid discharged from the cleaning drum 2 are transferred to the screen 3a.
By collecting the washing liquid through the separation tank, only the washing liquid can be collected in the separation tank 3, and the light-weight material can be separated and separately collected.

Further, the recovery tank 4 is provided with a conveyor 12 as means for transporting the object to be cleaned discharged from the discharge port 9 to an apparatus in the next step. The discharged object to be washed is discharged directly from the discharge port 9 onto the conveyor 12, and is conveyed to the next-step apparatus. The cleaning liquid dripping from the object to be cleaned is recovered by the recovery tank 4 during transportation. That is, in the recovery tank 4, the cleaning target that has been subjected to the cleaning and separation processing in the cleaning drum 2 is drained.

Here, the cleaning liquid collected in the separation tank 3 and the cleaning liquid used in the recovery tank 4 are operated by the pump 11 to operate.
The cleaning liquid is transferred to the cleaning tank 7a and the cleaning tank 7c through the hollow shaft 5, and the collected cleaning liquid is reused to perform the cleaning process. The object to be cleaned in the cleaning tank 7e is subjected to a cleaning process from the cleaning tank 7a to the cleaning tank 7c.
Since the state is relatively low in dirt, it is necessary to clean with a clean cleaning liquid. Therefore, a new cleaning liquid is supplied to the cleaning tank 7e.

Incidentally, the new cleaning liquid is usually tap water,
Although industrial water or well water is used, a detergent may be mixed with them to enhance the cleaning effect. Also,
Ozone water can also be used as a new cleaning liquid in order to increase the deodorizing effect and the sterilizing effect of the odor.

<Washing and Transferring Operation of Washing Object> The washing and transferring process of the washing object in the specific gravity separation type continuous washing machine 1 configured as described above will be described below.

First, when a small piece of a PET bottle, which is an object to be washed, is put into the washing tank 7a from the inlet 8 of the washing drum 2, the washing drum 2 is swung within a certain angle range by the driving device, and the washing tank 7a is rotated. The object to be cleaned is cleaned in. At this time, the lightweight material adhering to the small pieces is transferred to the separation tank 3 together with the cleaning liquid. Next, after the cleaning by the rocking operation is completed, the cleaning drum 2 is rotated once in one direction by the driving device, so that the object to be cleaned in the cleaning tank 7a is moved to the next cleaning tank by the spiral plate 6. 7b.

Subsequently, in the cleaning tank 7b, a cleaning operation by swinging is performed in the same manner as the above operation. Here, during the cleaning operation by swinging in the cleaning tank 7b, the light-weight material floating near the cleaning liquid level is cut off by the notch 10 in the double spiral plate 6a.
When the opening is provided on the double spiral plate 6a and the opening 6b provided on the lower side of the washing drum 2, the lightweight material is transferred to the separation tank 3 together with the washing liquid through the opening 6b. After the completion of the cleaning process, the cleaning drum 2 is rotated once, whereby the transfer operation to the next tank (the cleaning tank 7c) is performed by the double spiral plate 6a.

In the cleaning tank 7c, a cleaning operation by swinging and a next tank (the cleaning tank 7) by rotating the cleaning drum 2 once.
The transfer operation to d) is performed. In the cleaning tank 7d, similarly to the cleaning tank 7b, during the cleaning operation, a light-weight object is discharged from the notch 10 of the double spiral plate 6a, and an opening 6b provided in the double spiral plate 6a is When it is on the lower side, the lightweight material is transferred to the separation tank 3 together with the cleaning liquid through the opening 6b. After the cleaning operation, the cleaning drum 2
Is rotated once to perform a transfer operation to the next tank (washing tank 7e). In the cleaning tank 7e, similarly to the cleaning tank 7c, a cleaning operation by swinging and a transfer operation to the next tank (the cleaning tank 7f) by rotating the cleaning drum 2 once are performed. In the cleaning tank 7f, the cleaning operation after the cleaning operation is performed. The object to be cleaned is discharged from the discharge port 9 to the collection tank 4 by the transfer operation.

The object to be cleaned discharged from the discharge port 9 is
Draining is performed in the collection tank 4 and the object to be cleaned is
As a result, the cleaning liquid dripping from the object to be cleaned being transported is recovered while being transported to the apparatus in the next step. As described above, the separation and cleaning steps of the present embodiment are completed.

The cleaning liquid and the light-weight material discharged from the cleaning tank 7a of the cleaning drum 2 and the two double spiral plates 6a are separated and collected through the screen 3a of the separation tank 3. Specifically, only the cleaning liquid is collected in the separation tank 3, and the light-weight material is separately collected after separation.

As described above, according to the specific gravity separation type continuous washing machine 1 of the present embodiment, the amount of the washing liquid to be newly supplied can be saved by reusing the washing liquid once used for the washing treatment, Simultaneously with the washing operation of the above, the small pieces of PET and the light-weight object can be separated with high accuracy.

In the washing drum 2 of the above-mentioned specific gravity separation type continuous washing machine 1, a window 13 that opens and closes is provided on the side surface of the washing tank as shown in FIG. May be provided. By configuring the cleaning drum 2 in this manner, when the cleaning drum rotates by a certain rotation angle during the cleaning operation, the window 13 opens, and the lightweight material is discharged from the window 13 by overflow, and separated with the cleaning liquid. It can be transferred to the tank 3. The position where the window 13 is provided and the number, size, shape, and the like of the windows 13 can be appropriately set in consideration of the size of the small pieces.

<Specific gravity separation type recovery tank> Further, in the above specific gravity separation type continuous washing machine, specific gravity separation of a light-weight material is performed together with the cleaning process in the cleaning drum. The recovery tank is configured as shown in FIG. 4 or FIG. Thereby, the specific gravity separation of the light-weight material can be performed in this specific gravity separation type recovery tank. That is, even when the light-weight material cannot be completely separated by the washing drum, the specific gravity of the light-weight material can be surely separated. Hereinafter, this specific gravity separation type recovery tank will be described with reference to FIGS. 4 and 5.

<One Embodiment of Specific Gravity Separation-Type Recovery Tank> A specific gravity separation-type recovery tank 4a shown in FIG. 4 is composed of two partition plates that partition the recovery tank so that water can flow at the bottom of the recovery tank 4a. 1
5a and 15b are provided in parallel, and a winged rotary body 16 that rotates in water by a driving device (not shown) is provided between the two partition plates 15a and 15b. Pump 1
By the operation of 7, the water in the recovery tank 4a is circulated, and the wastewater from the tank is supplied again into the tank. Further, the recovery tank 4a is provided with a first conveyor 12a as a means for collecting lightweight objects floating near the water surface after being separated from the specific gravity, and for transporting an object to be washed (small pieces) after the specific gravity separation to the next step. And a second conveyor 12b as a means.

In the recovery tank 4a having the above-described structure, the water is discharged from the cleaning drum by the water flow in the recovery tank 4a due to the circulation of water and the stirring action of the winged rotary body 16, and the partition plate 15b is located on the right side of the drawing. The objects to be cleaned (hereinafter referred to as “mixed / collected materials”) including the light-weight materials put into the area are surely separated one by one into the light-weight materials and small pieces. As a result, the light-weight materials in the mixed / collected materials float up, The small pieces settle on the second conveyor 12b. As described above, the specific gravity-separation type recovery tank 4a can surely separate the light-weight object with the specific gravity. Further, the light-weight material separated in specific gravity is collected by the first conveyor 12a,
After the completion of the light-weight object recovery process, the object to be cleaned (small pieces) from which the light-weight object has been removed is transported to the next step by the second conveyor 12b.

Here, the recovery tank 4a is provided with the partition plate 15a,
The same effect can be obtained even when either one of the rotating body 15b and the winged rotating body 16 is provided. Specifically, in the recovery tank 4a having only the partition plates 15a and 15b, when the water in the recovery tank 4a is circulated by the operation of the pump 17, the mixing and recovery performed in the water in FIG. The object flows into the right side region of the partition plate 15b in the drawing by the water flow, and the specific gravity of the lightweight object is separated in this region. Also, in the collecting tank 4a having only the winged rotary member 16, even when the water in the collecting tank 4a is circulated by the operation of the pump 17, the water is generated by the operation of the winged rotary member 16. In the same manner as described above, the specific gravity separation of the light-weight objects is performed in the right side area of the partition plate 15b of the recovery tank 4a in the same manner as described above.

<Other Embodiment of Specific Gravity Separation Type Recovery Tank> Another embodiment of the specific gravity separation type recovery tank is a specific gravity separation type recovery tank 4b shown in FIG. The specific gravity separation type recovery tank 4b is provided with a partition plate 15c at the bottom part that divides the recovery tank 4b so that water can flow, and a gas supply for injecting and supplying gas into water from the bottom part of the recovery tank 4b. An apparatus (not shown) is provided. By jetting the gas into the water by the gas supply device, the water in the recovery tank 4b is stirred, and a water flow is generated.

In the specific gravity separation type recovery tank 4b having the above structure, a specific gravity separation process is performed as follows. First, an object to be cleaned including a light-weight object is discharged from the cleaning drum, and is put into a region on the right side of the partition plate 15c of the collection tank 4b in the drawing. The input mixed and recovered material is surely separated into small pieces and small pieces one by one due to the agitation of water generated by the injection of gas from the bottom of the collecting tank 4b. The small pieces settle on the second conveyor 12b. In this way,
According to the specific gravity separation type recovery tank 4b, a lightweight object can be surely separated by specific gravity. Further, the light-weight objects separated in specific gravity are collected by the first conveyor 12a in the same manner as the collection tank 4a in FIG. To the next process.

Here, as described above, a conveyor as shown in FIGS. 4 and 5 is used as a means for removing the small pieces from the collection tank and transporting them to the next step. A configuration may be adopted in which the small pieces are pumped up together with the water in the tank by the operation of the pump, and the small pieces are taken out of the collection tank.

As described above, according to the specific gravity separation type recovery tank, even if the lightweight material cannot be completely separated by the washing drum of the specific gravity separation type continuous washing machine, the specific gravity of the lightweight material is surely separated. It becomes possible.

In the specific gravity separation type recovery tank, the washing drum does not have a notched double spiral plate.
In other words, even when used in a conventional continuous washing machine in which specific gravity separation is not performed by the cleaning drum, the object to be cleaned can be subjected to separation processing in the specific gravity separation type recovery tank. It is possible to separate an object with high accuracy.

[0037]

As described above, according to the specific gravity separation type continuous washing machine of the present invention, the washing process can be performed by reusing the washing solution once used in the washing process, and therefore, a new supply is required. The amount of cleaning solution can be saved. In addition, in the washing drum, at the same time as the washing operation of the small pieces, the small pieces of PET are separated from the small pieces, and the lightweight articles are also separated and removed in the separation tank and the recovery tank. It is possible to efficiently collect the small pieces of the PET.

Further, according to the specific gravity separation type recovery tank of the present invention, even when the lightweight material cannot be completely separated by the washing drum of the above specific gravity separation type continuous washing machine, the specific gravity of the lightweight material is surely separated. It becomes possible. In addition, even if this specific gravity separation type recovery tank is used in a conventional continuous washing machine in which specific gravity separation processing is not performed in the cleaning drum, the object to be cleaned can be subjected to separation processing in the specific gravity separation type recovery tank. As a result, it is possible to accurately separate the PET small pieces from the lightweight objects.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a specific gravity separation type continuous washing machine according to an embodiment of the present invention.

FIG. 2 is a view showing that a notch is provided on one side surface of the double spiral plate of the specific gravity separation type continuous washing machine of the embodiment.

FIG. 3 is a diagram illustrating a configuration of a cleaning drum according to another embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a specific gravity separation type recovery tank according to one embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a specific gravity separation type recovery tank of another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Specific gravity separation type continuous washing machine, 2 ... Cleaning drum, 3 ... Separation tank, 3a ... Screen, 4 ... Recovery tank, 5 ... Hollow shaft, 6 ...
Spiral plate, 6a: double spiral plate, 6b: opening, 7a to 7f: washing tank, 8: inlet, 9: outlet, 1
0: Notch, 11: Pump, 12: Conveyor.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Sugimoto 707-1 Higashigoyashiki, Yamanashi-shi, Yamanashi Prefecture F-term (reference) 3Y201 AA22 AB13 AB33 AB38 BB04 BB92 BB94 CB15 CD22

Claims (4)

[Claims] 1. A cleaning drum having a hollow cylindrical shape for cleaning an object to be cleaned, a separation tank for separating and recovering a cleaning solution from a mixed discharge of a cleaning solution and a lightweight material discharged from the cleaning drum,
A collecting tank having means for collecting the object to be washed discharged from the washing drum and transporting the object to be washed after separating and removing the light-weight object to the next step, wherein the washing drum cleans the object to be washed. A spiral spiral plate for transfer is provided on the inner wall of the washing drum, so that the washing drum has a plurality of washing tanks, and at least one spiral plate between the washing tanks has a double structure. The double spiral plate is provided with a cutout on a surface on the discharge port side of the double spiral plate for discharging a light-weight material from the cleaning drum due to overflow, and a contact between the double spiral plate and the cleaning drum is provided. The surface is provided with an opening for discharging the light-weight material discharged from the notch to the outside of the washing drum, and the separation tub is provided with a mixing tub discharged from the first washing tub and the opening. The cleaning liquid separated and recovered from the combined discharge is supplied as a reused liquid to cleaning tanks other than the last cleaning tank, and the recovery tank transfers water in the tank to cleaning tanks other than the last cleaning tank. A specific gravity-separated continuous washing machine, characterized in that it is configured to be supplied as a product. 2. The continuous washing machine according to claim 1, wherein the washing drum is provided with a window that opens and closes on a side surface of each washing tub. 3. A means for recovering a light-weight material from the mixed recovered material, a means for transporting an object to be cleaned from which the light-weight material has been separated and removed, and a water flowable at the bottom portion. A partition plate for partitioning the tank, or one of a winged rotating body that is rotated by a driving device in water, and the drainage from the tank is supplied again into the tank by the operation of the pump. A specific gravity separation type recovery tank characterized by being constituted. 4. A means for recovering a light-weight material from the mixed recovered material, a means for transporting an object to be cleaned from which the light-weight material has been separated and removed, and a method for introducing gas into water from the bottom of the recovery tank. And a gas supply device for injecting water.