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Title:
DEVICE FOR REDUCING VOLUME OF WASTED-STYRENE FOAM
Document Type and Number:
WIPO Patent Application WO/2002/094530
Kind Code:
A1
Abstract:
The present invention relates to a device for reducing the volume of a wasted-styrene foam, comprising a crushing part which crushes the wasted-styrene foam into small particles with a predetermined size for a efficient pressing process, a first pressing part which vertically presses the crushed particles, a second pressing part which horizontally presses the crushed particles, and a accumulating duct which enables the a gas detained inside a pressed wasted-styrene foam to escape therefrom and maintains the pressed wasted-styrene foam at a predetermined density and shape. Therefore, with the volume-reducing device according to the present invention, the wasted-styrene foam is easily pressed at a predetermined density and shape.

Inventors:
HWANG BYUNG BOK (KR)
CHOI HO JOON (KR)
Application Number:
PCT/KR2001/000816
Publication Date:
November 28, 2002
Filing Date:
May 17, 2001
Export Citation:
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Assignee:
JYROBOTICS CO LTD (KR)
HWANG BYUNG BOK (KR)
CHOI HO JOON (KR)
LIM JOONG YEON (KR)
International Classes:
B29B17/00; B29B17/04; B30B9/30; (IPC1-7): B29B17/00
Foreign References:
KR0145102B11998-07-15
JPS63233805A1988-09-29
KR20000018814U2000-10-25
JPH01146708A1989-06-08
JP2000334736A2000-12-05
Attorney, Agent or Firm:
Huh, Sang Hoon (16th Fl. Woori Investment Bank Bldg. 826-20 Yeoksam-dong Kangnam-ku Seoul 135-180, KR)
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Claims:
Claims What is claimed is:
1. A volumereducing device comprising : a crushing part (10) comprising a first hopper (12) for receiving a wastedstyrene foam, first crushing rollers (14) and second crushing rollers (16) disposed below the first crushing rollers (14) for crushing the wastedstyrene foam by way of two steps; a transporting part (20) comprising a second hopper (22) for receiving a crushed wastedstyrene foam and a screw conveyer (24) located at the lower end of said second hopper (22); a pressing room (30) where the crushed wastedstyrene foams transported from said transporting part (20) are accumulated; a first pressing part (40) comprising a vertical pressing cylinder (42) mounted on the upper part of said pressing room (30) and a vertical pressing plate (44) equipped inside said pressing room (30), wherein the vertical pressing plate (44) is connected to the vertical pressing cylinder (42) so as to be operated together therewith ; a second pressing part (50) comprising a horizontal pressing cylinder (52) installed at the lower part of said pressing room (30) and a horizontal pressing plate (54) connected to the horizontal pressing cylinder (52) so as to be operated together therewith ; a tapered frame (60) installed at the lower part of the pressing room (30), opposite to the horizontal pressing cylinder (52); a first accumulating duct (70) comprising a first upper panel (72), a first lower panel (76) and first side panels (74) which are removably fixed to said tapered frame (60) by a hinge connection, wherein the first side panels (74) are integrally equipped with first inserting legs (77) for receiving a first pushing panel (78); and a second accumulating duct (80) comprising a latticeshaped second upper panel (82), a second lower panel (86) firmly connected to the first lower panel (76), second side panels (84) having a second inserting leg (87), connected to the first side panels (74) by a hinge connection, and a second pushing panel (88) for compressing the latticeshaped second upper panel.
2. The volumereducing device according to claim 1, further comprising a guide rod (46) connected to the vertical pressing plate (44) through the upper part of the pressing room (30), wherein the guide rod (46) is provided with a limit switch (48) for detecting a vertical motion at the upper part thereof.
3. The volumereducing device according to claim 1, wherein three limit switches (56) for detecting a horizontal motion are installed at the rear part of the horizontal pressing cylinder (52) in order to control the horizontal motion of the horizontal pressing plate (54) in a way of two steps.
4. The volumereducing device according to claim 1, wherein the first side panels (74) and the second side panels (84) are adjustably fixed to the upper panels (72,82) and the lower panels (76, 86).
5. The volumereducing device according to claim 1 or claim 5, wherein the first accumulating duct (70) and the second accumulating duct (80) are provided with a plurality of ventilating holes (94) at their side panels (74, 84) and lower panel (74, 84).
Description:
DEVICE FOR REDUCING VOLUME OF WASTED-STYRENE FOAM BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a device for reducing a volume, more particularly to a device for reducing the volume of a wasted-styrene foam having a lot of void space, capable of minimizing the volume of a wasted-styrene foam in a form of a recyclable densifie mass by pressing method.

Description of the Prior Art In an industry using styrene foam and polyurethane, waste materials such as a wasted-styrene foam and a wasted-polyurethane are inevitably produced.

Therefore, the development of a method and an apparatus, capable of minimizing the volume of the wasted materials by removing a void space existing therein, has been strongly requested.

The primary object of reducing the volume of the wasted-styrene foam or polyurethane is to significantly save cost involved in transporting and storing.

Furthermore, the compressed styrene foam has an enormous potential value from the standpoint of recycling because it can be easily restored to reusable foam through a simple crushing process.

SUMMARY OF THE INVENTION Accordingly, me primary object of the present invention is to provide a device for reducing the volume of a wasted-styrene foam, comprising a crushing part which crushes the wasted-styrene foam into small particles with a predetermined size for a efficient pressing process, a first pressing part which

vertically presses the crushed particles, a second pressing part which horizontally presses the crushed particles, and a accumulating duct which enables the a gas detained inside pressed particles to escape therefrom and maintains pressed particles at a predetermined density and shape.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows front view of the device according to the present invention.

FIG. 2 shows top view of the accumulating duct according to the present invention.

FIG. 3 shows front view of the accumulating duct according to the present invention.

FIG. 4 shows side view of the accumulating duct according to the present invention.

FIG. 4 shows perspective view of the accumulating duct according to the present invention.

[Numeral on drawings] 10: crushing part 12: first hopper 14: first crushing rollers 16: second crushing rollers 20: transporting part 22: second hopper 24: screw conveyer 30: pressing room 40: first pressing part 42: vertical pressing cylinder 44: vertical pressing plate 46: guide rods 48: limit switch for detecting a vertical motion 50: second pressing part 52: horizontal pressing cylinder

54: horizontal pressing plate 56: limit switch for detecting a horizontal motion 60: tapered frame 70: first accumulating duct 72: first upper panel 74: first side panels 76: first lower panel 77: first inserting legs 78: first pushing panel 80: second accumulating duct 82: second upper panel 84: second side panels 86: second lower panel 87 : second inserting legs 88: second pushing panel 92: adjustable pushing bolts 94: ventilating holes 96: supporting frame 98: supporting table 100: volume reducing device DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the preferred embodiment of the present invention will be disclosed with reference to the accompanying drawings.

A volume-reducing device according to the present invention comprises: a first hopper (12) for receiving a wasted-styrene foam; a crushing part (10) comprising first crushing rollers (14) and second crushing rollers (16) disposed below the first crushing rollers (14); a second hopper (22) for receiving a crushed styrene foam; a transporting part (20) comprising a screw conveyer (24) located at the lower end of said second hopper (22); a pressing room (30) where the crushed styrene foams transported from said transporting part (20) are accumulated; a first pressing part (40) comprising a vertical pressing cylinder (42)

mounted on the upper part of said pressing room (30) and a vertical pressing plate (44) equipped inside said pressing room (30), wherein the vertical pressing plate (44) is connected to the vertical pressing cylinder (42) so as to be operated together therewith; a second pressing part (50) comprising a horizontal pressing cylinder (52) installed at the lower part of said pressing room (30) and a horizontal pressing plate (54) connected to the horizontal pressing cylinder (52) so as to be operated together therewith; a tapered frame (60) installed at the lower part of the pressing room (30), opposite to the horizontal pressing cylinder (52); a first accumulating duct (70) comprising a first upper panel (72), a first lower panel (76) and first side panels (74) which are removably fixed to said tapered frame (60) by a hinge connection, wherein the first side panels (74) are integrally equipped with first inserting legs (77) for receiving a first pushing panel (78); and a second accumulating duct (80) comprising a lattice-shaped second upper panel, a second lower panel (86) firmly fixed to the first lower panel (76), second side panels (84) having a second inserting leg (87), connected to the first side panels (74) by a hinge connection, and a second pushing panel (88) for compressing the lattice-shaped second upper panel.

In one preferred embodiment, a guide rods (46) are connected to the vertical pressing plate (44) through the upper part of the pressing room (30), the guide rod (46) being provided with a limit switch (48) for detecting a vertical motion at the upper part thereof.

In another preferred embodiment, three limit switches (56) for detecting a horizontal motion are installed at the rear part of the horizontal pressing cylinder

(52) in order to control the horizontal motion of the horizontal pressing plate (54) in a way of two steps.

In another preferred embodiment, the first side panels (74) of the first accumulating duct (70) are adjustably fixed to the first upper panel (72) and the first lower panel (76). In the same manner, the second side panels (84) of the second accumulating duct (80) are adjustably fixed to the second upper panel (82) and the second lower panel (86).

Furthermore, said first accumulating duct (70) and said second accumulating duct (80) are provided with a plurality of ventilating holes (94) at their side panels (74,84) and lower panel (74,84).

Furthermore, the pressing room (30) is firmly supported by a supporting frame (96) below which a supporting table (98) is disposed at the bottom surface to stabilize the whole device.

Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The Fig. 1 schematically shows front view of the device according to the present invention.

In case that the wasted-styrene foam to be treated is a large quantity, as shown in the Fig. 1, the crushing part (10) can be separately installed with the pressing room (30) for improving the efficiency of process. Alternatively, the crushing part (10) can be integrally installed with the pressing room (30) for compacting the size of the device.

The crushing part (10) comprises a first hopper (12) for receiving the wasted-styrene foam, first crushing rollers (14) and second crushing rollers (16) for crushing the wasted-styrene foam.

It is preferable that the size of the first hopper (12) is configured in consideration of the size of the wasted-styrene foam which generally has a cubic shape.

The first crushing rollers (14) installed below the first hopper (12) are designed to roughly destroy the injected wasted-styrene foam. Meanwhile, the second crushing rollers (16) installed below the first crushing rollers (14) rotate at high speed in relative to the first crushing roller (14), wherein the roughly destroyed wasted-styrene foam is finely crushed again.

Consequently, the whole crushing process of the wasted-styrene foam is accomplished through the first crushing process where the styrene foam is roughly destroyed in medium size and second crushing process where the destroyed styrene foam is finely crushed into small particles.

Subsequently, the crushed styrene foam is transferred into the pressing room whose construction will be detailed below with reference to the accompanying Figs. 1-5.

As mentioned, the crushed styrene foam is transferred into the pressing room (30) through a transporting part (20) comprising a second hopper (22) for receiving the crushed styrene foam and a screw conveyer (24) located at the lower end of said second hopper (22).

More particularly, the screw conveyer (24) is installed in a transverse direction, of which one end, outlet, is connected to the pressing room (30) through a downwardly inclined pipe, wherein the crushed styrene foam inputted from the second hopper (12) is transversely transferred at a predetermined speed and then accumulated onto the bottom of the pressing room (30).

Hereinafter, the pressing part of the present invention, which can be divided into a first pressing part and a second pressing part, is described in detail.

The size of the pressing room (30) is selectively installed in accordance with the capacity of wasted-styrene foam to be treated.

The first pressing part (40) comprises a vertical pressing cylinder (42) mounted on the upper part of the pressing room (30) and a vertical pressing plate (44) connected to the vertical pressing cylinder (42).

Particularly, a vertical pressing cylinder (42) is mounted on the center of the upper part of the pressing room (30). The lower end of a piston of the vertical pressing cylinder (42) is integrally fixed to the vertical pressing plate (44), wherein the area of the vertical pressing plate (44) is approximately same as the inner area of the pressing room (30). Consequently, the vertical pressing plate (44) vertically reciprocates in accordance with the movement of the vertical pressing cylinder (42).

More preferably, the vertical pressing plate (44) is further provided with guide rods (46) of which the lower ends are integrally fixed thereto, the guide rods (46) being longer than the vertical length of the pressing room (30) and being provided with limit switches (48) for detecting a vertical motion.

In the vertical movement of the vertical pressing plate (44), the guide rods (46) play an important role hi maintaining a verticality of the reciprocating movement of the vertical pressing plate (44).

Subsequently, the crushed styrene foam accumulated in the pressing room (30) is compressed by the pressure caused by downward movement of the vertical pressing plate (44). In this first pressing process, pressing degree of the wasted-styrene foam can be adjusted in constant by detecting a reciprocating distance of the vertical pressing plate (44) by means of the limit switches (48) and then controlling the same.

When the vertical pressing plate (44) is positioned at the bottom limit, the vertical pressing plate (44) is fixed at its position and the second pressing part (50)

is activated as following description.

The second pressing part (50) comprises a horizontal pressing cylinder (52) installed at the lower part of the pressing room (30) by means of a frame and a horizontal pressing plate (54) connected to the horizontal pressing cylinder (52) so as to be operated together therewith.

Furthermore, the horizontal pressing cylinder (52) is provided with three limit switches (56) for detecting a horizontal motion, which are installed at the rear part thereof in order to control the horizontal motion of the horizontal pressing plate (54) in a way of two steps.

Under the circumstance that the wasted-styrene foam is compressed by the vertical pressing plate (44) positioned at the bottom limit, the second pressing process begins with the horizontal motion of the horizontal pressing plate (54) in accordance with movement of the horizontal pressing cylinder (52), wherein the horizontal motion of the horizontal pressing plate (54) is controlled by the limit switches (56).

By the control of limit switches (56), the horizontal pressing plate (54) firstly advances to the middle point and then backwardly retreat to the initial point.

Thereafter, the horizontal pressing plate (54) fully advance from the initial point to the ending point at one time.

Namely, the three limit switches (56) control the movements of the horizontal pressing plate (54), comprising steps of advancing to the middle point, retreating backward to the initial point, and fully advancing from the initial point to the ending point at one time.

The reason that the horizontal pressing process is divided in two steps is to give time to the gas detained inside of the pressed styrene foam to be expelled.

Vibrations and stresses generated during the pressing process of the present

invention are easily absorbed by a supporting structure consisting of a supporting frame (96) disposed below the pressing room (30) and a supporting table (98) disposed at the bottom surface to stabilize the whole device.

After completing the first (vertical) pressing process and the second (horizontal) pressing process, the pressed wasted-styrene foam is transferred to a first accumulating duct through a exit formed at the opposite side of the horizontal pressing cylinder (52).

Because the exit is constructed by a tapered frame (60) whose sectional area becomes narrow in proportion to the distance from an inlet thereof, the vertically and horizontally pressed wasted-styrene foam passing through the tapered frame is pressed again.

Advantageously, when the change of the size of finally pressed styrene foam is required, it is easily done by replacing the tapered frame (60) with another sized tapered frame.

Accordingly, in order to have the wasted-styrene foam pressed at a predetermined density, the tapered frame (60) can be changed, whereby the wasted-styrene foam compressed at a predetermined density can be transferred to the accumulating ducts.

Hereinafter, the function and the structure of the accumulating ducts are described with reference to the Fig. 2, Fig. 3, Fig. 4 and Fig. 5.

The accumulating ducts consist of a first accumulating duct (70) and a second accumulating duct (80). The functions of the accumulating ducts are to expel the gas detained in the compressed wasted-styrene foam and to maintain the density and the shape of the compressed wasted-styrene foam.

In the structure of the first accumulating duct (70), a first upper panel (72), a first lower panel (76) and side panels (41) are removably fixed to the outlet of the

tapered frame (60) by means of a hinge. Moreover, the first side panels are fixed to the first upper panel and the first lower panel by means of a plurality of adjustable pushing bolts. Furthermore, the first lower panel and the first side panel are provided with ventilating holes (94) penetrating the panels.

The first side panels (74) of the first accumulating duct are further provided with a first inserting legs (77) integrally formed therewith, which has a L-shape over the first upper panel such that a first pushing panel (78) having a certain weight can be fitted in order to press the first upper panel (72).

In the second accumulating duct (80), the second lower panel (86) is integrally connected to the first lower panel (76) and the second side panels (84) are connected to the first side panels (87) by means of a hinge. As same as the first side panels (74), the second side panels (84) are further provided with a second inserting legs (87) integrally formed therewith.

Meanwhile, a second upper panel (82) of the second accumulating duct (80) has a lattice shape, and it is disposed onto the upper surface of wasted-styrene foam passing through the second accumulating duct (80).

In the same manner, a second pushing panel (88) is fitted into the second inserting legs (87) so as to press the lattice shaped second upper panel (82). The second lower panel (86) and the second side panels (84) are also provided with ventilating holes (94).

The detailed operations of the first accumulating duct and the second accumulating duct are described as below.

While the compressed wasted-styrene foam discharged from the tapered frame (60) is passing through the first accumulating duct (70) maintaining the shape thereof, the gas detained inside of the compressed wasted-styrene foam is expelled through a plurality of ventilating holes (94) punched on the first lower

panel (76) and the first side panels (74). Accordingly, the wasted-styrene foam maintains its shape and density.

In a way of controlling the adjustable pushing bolts, the discharging pressure of the wasted-styrene foam passing through the first accumulating duct (70) can be easily controlled by changing the sectional area of the first accumulating duct (80).

Furthermore, the repulsive force caused by the wasted-styrene foam passing through the first accumulating duct (70) is properly restrained by fitting the first pushing panel (78) into the first inserting legs (77) such that the first pushing panel firmly presses the first upper panel (72). Consequently, the wasted-styrene foam remains the compressed state.

Subsequently, the wasted-styrene foam discharged from the first accumulating duct (70) passes though the second accumulating duct (80). In this stage, even though the most of gas detained inside of the wasted-styrene foam was already expelled at the first accumulating duct (70), remaining gas is completely expelled from the wasted-styrene foam while passing through the second accumulating duct (80). As a result, the wasted-styrene foam more easily maintains the predetermined density and shape.

In detail, the remaining gas is expelled through the space existed in the lattice shaped second upper panel (82) and the ventilating holes (94) punched on the second side panel and the second lower panel.

In the same manner with the first accumulating duct (70), the repulsive force caused by the wasted-styrene foam passing through the second accumulating duct (80) is properly restrained by fitting the second pushing panel (88) into the second inserting legs (87) such that the second pushing panel (88) firmly presses the lattice shaped second upper panel. Consequently, the wasted-styrene foam remains the

compressed state.

Alternatively, the discharging pressure and the density of the wasted-styrene foam can be readily controlled by varying the length of the first accumulating duct and the second accumulating duct.

As described above, the volume-reducing device according to the present invention is advantageous in that the void space of the wasted-styrene foam can be removed and the volume of the wasted-styrene foam can be minimized, so that the cost involved in recycling and disposal process can be reduced.

The volume-reducing device according to the present invention is further advantageous in that the device can be configurable in accordance with the capacity of the wasted-styrene foam to be treated, so that the device can efficiently perform a pressing procedure of the wasted-styrene foam, irrespective of the capacity thereof.

The volume-reducing device according to the present invention is further advantageous in that the wasted-styrene foam readily compressed at the predetermined density and shape due to the ventilating system therewith.