KR101586411B1 - Gravitational extruding apparatus of synthetic resin - Google Patents

Abstract

The present invention relates to a vertical downflow-type gravitational extruding apparatus and, more specifically, to a vertical downflow-type gravitational extruding apparatus, capable of producing molded products such as a regeneration pellet, a scrap, and the like, while smoothly melt extruding a synthetic resin raw material such as PE, PP, and the like by being vertically arranged and inserted inside. According to the present invention, a vertical downflow-type gravitational extruding apparatus comprises: a cylinder vertically arranged, and formed with an insertion hole inserted with a synthetic resin raw material on both sides of the upper part; a screw installed inside the cylinder in the longitudinal direction for extruding the synthetic resin raw material to the discharge side by being driven by a motor; a heater installed to cover the outer surface of the cylinder for heating and melting the synthetic resin raw material transported by the screw; a screw heater installed inside the screw; and a molding dice installed on the lower end of the cylinder, and pressure-molded with the fixed shape while the synthetic resin raw material is melt.

Description

[0002] Gravitational extruding apparatus of synthetic resin [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical downward gravity extrusion apparatus, and more particularly, to a vertically downward gravity extrusion apparatus for vertically arranging and discharging a resin downward by a weight of a raw material and a screw.

Generally, a synthetic resin melt extruder is a horizontal type, in which an extruding screw is installed inside a cylindrical heating cylinder, and the extruding screw is rotated by using a driving device provided at the distal end to melt the synthetic resin material fed through the upward hopper, And extruded through a die formed at the end.

In the horizontal type extruding apparatus, there is a problem that the bearing shaft for fixing the screw is only one side, and the screw blade and the inner wall of the cylinder are in contact with each other at the outlet side, resulting in wear and thermal damage.

As a conventional technique of a horizontal type, Patent Document 1 discloses a method in which at least one extrusion screw is provided in a heating cylinder, a driving device provided at the tip portion rotates the extrusion screw, and the synthetic resin raw material supplied through the raw material supplying portion is melted, And extruding the extruded resin through a formed discharge portion.

Patent Literature 1 aims at providing a pair of asymmetric screws inside a cylinder, and by installing a replaceable sleeve, it is possible to reduce the cost of the cylinder boring operation, thereby reducing the production cost of the product.

Patent Document 2 discloses a synthetic resin melt extruder in which a friction portion is coupled to one side of a crushing portion and a driving portion is coupled to the other side. A cylinder is provided inside the crushing portion to rotate a driving screw and a driven screw extending from the driving portion, And the rotating friction piece provided at the end portion of the driven screw is rotationally rubbed against the fixed friction plate of the friction portion to generate frictional heat so that the synthetic resin injected through the hopper melts and discharges.

The above conventional technologies are largely arranged in the horizontal direction, so that an excessive load is applied to the motor for horizontal extrusion and discharge, the screw and the cylinder wear abruptly, the screw and screw shaft are broken, and the dies, bearings, . Further, there is a problem that installation space is limited and maintenance is difficult.

1. Korean Utility Model Registration No. 20-0274895 (registered on April 29, 2002) 2. Korean Registered Patent No. 10-1111392 (Registered on Jan. 26, 2012)

Disclosure of the Invention The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide a vertical Top down gravity extrusion device.

Also, it is intended to provide a vertical downward gravity extrusion apparatus which can easily perform repairing and replacing operations of various mechanical elements installed in a cylinder without being restricted by installation space.

It is another object of the present invention to provide a vertically downward gravity extrusion apparatus capable of preventing the molten synthetic resin from flowing out by forming a multi-stage shielding structure at a joint portion between a molding die and a screw.

In order to achieve the above object, a vertical downward gravity extrusion apparatus according to the present invention comprises a cylinder (1) vertically installed by a support, an inlet (11) installed at the upper end of the cylinder for inputting a raw material, A screw 2 installed in the longitudinal direction inside the cylinder 1 and driven by the motor 5 to extrude the synthetic resin raw material to the discharge side, a synthetic resin raw material which is installed to surround the outer surface of the cylinder 1 and is conveyed by the screw 2 A screw heating heater 80 provided inside the screw, and a molding die 4 provided at the lower end of the cylinder 1 for extruding molten synthetic resin into a predetermined shape .

A plurality of perforations (30) are formed in the longitudinal direction inside the body of the lower part of the cylinder to insert the auxiliary heater (31).

The screw heating heater is characterized in that a fluid is filled in a pipe and heated, or a heating rod is inserted to heat the screw.

A plurality of convex portions 431 for blocking the leakage of the molten synthetic resin are formed at regular intervals on the upper portion of the screw support 43. A concave portion 211 corresponding to the convex portion 431 is formed on the bottom surface of the outward expanding portion 21, ) Is formed.

The molding die is equipped with a filtration means 6 for removing impurities contained in the synthetic resin so as to be able to be inserted and removed. The filtration means 6 includes a fixing plate 61 on which a plurality of bolt fastening holes 611 are formed And a filtering net 62 having a lattice structure orthogonally coupled to the inner surface of the fixing plate 61.

And an intersecting cutter blade for cutting the molded product discharged from the molding die is provided at the bottom of the molding die so as to interact with each other.

Since the vertical downward gravity extrusion apparatus according to the present invention is vertically disposed and extruded while the raw material of the synthetic resin is melted, the mechanical load pressure element is small and the wear of the inside of the cylinder as well as the screw and the breakage of the mechanical elements such as the motor are prevented Thereby reducing wear and tear, thereby reducing work interruption and doubling productivity.

In addition, since repair and replacement of various mechanical elements installed in the cylinder can be easily and conveniently performed without being restricted by the installation space, it is possible to greatly shorten the maintenance work time and prevent the occurrence of safety accidents .

Further, in order to prevent leakage of the molten synthetic resin, which may occur in the vertical downward direction, a multi-stage shielding structure is formed at the joining portion of the molding die and the screw, so that smooth production can be continuously maintained without interruption.

In addition, since the residence time of the resin material in the vertical downward gravity extrusion apparatus is small, it is possible to further improve the melting of the resin material by rapid heating by providing a heating device inside the screw pipe.

1 is a cross-sectional view of a vertical downward gravity extrusion apparatus in accordance with the present invention comprising twin screws;
2 is a cross-sectional view and a bottom view of a cylinder auxiliary heater according to the present invention.
3 is a bottom plan view of a forming die of a vertical downward gravity extrusion apparatus according to the present invention.
Figure 4 illustrates another embodiment of a forming die of a vertical downward gravity extrusion apparatus according to the present invention.
5 is an enlarged view of a leakage preventing structure of a vertical downward gravity extrusion apparatus according to the present invention.
6 is a view showing another embodiment of a vertical downward gravity extrusion apparatus according to the present invention.
7 is a cross-sectional view of a heater with a heater installed inside the screw.

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

The vertical downward gravity extrusion apparatus according to the present invention is vertically disposed so as to produce molded products such as pellets and scrap while melt-extruding the synthetic resin raw materials such as PE and PP smoothly using gravity and screws. The vertical downward gravity extrusion apparatus includes a cylinder 1 having two injection ports 11 through which a raw material of a synthetic resin is injected into an upper portion of the cylinder, a motor 5 installed in the longitudinal direction of the cylinder, A cylinder heating heater 3 for heating and melting the raw material of the synthetic resin conveyed by the screw so as to surround the outer surface of the cylinder, a screw heating heater 80 installed inside the screw, And a molding die (4) installed at the lower end of the cylinder and press-molding the synthetic resin raw material into a predetermined shape while being melted.

FIG. 1 is a cross-sectional view of a vertical downward gravity extrusion apparatus according to the present invention, which is composed of a pair of screws. The cylinder 1 has an inlet 11 through which a raw material of synthetic resin is injected, A cylinder 2 installed to surround the outer periphery of the cylinder 1 and driven by the motor 5 to extrude the synthetic resin raw material to the discharge side, a cylinder 2 for heating and melting the synthetic resin raw material, A heating heater 3, and a molding die 4 installed at the lower end of the cylinder 1 and press-molded into a predetermined shape by melting the raw material of the synthetic resin.

In the conventional horizontal type melt extruder, since the raw material input port (hopper) is supplied only from the upper side, both the outer screw and the pair screw are unevenly charged and mixed, resulting in a break phenomenon and uneven quality of the molded product. There is a problem in that the screw is overloaded due to the deflection of the raw material. The present invention solves this problem, and is advantageous in that the raw material can be fed continuously without interruption due to the weight of the raw material, since the raw material is fed from both the input ports (11) at the upper end of the screw (2).

The vertical downward gravity extrusion apparatus of the present invention is a vertical downward gravity extrusion apparatus in which cylinders 1 and the like are arranged vertically so as to uniformly feed a synthetic resin raw material through both of the inlet ports 11 of the cylinder 1, So that the molded product discharged through the molding die 4 is discharged in a uniform form.

The upper end of the cylinder 1 is fixed in a vertical direction at the center of a fixed frame 8 in the form of a rectangular frame and the lower end thereof is supported by a heavy object support 9 in the form of a rectangular frame. The fixed frame 8 and the weight support 9 are configured to be engageable with and detachable from the flange 12 of the cylinder. The cylinder or screw can be pulled up by using a crane, a chain and a hook, etc., and the heavy object support can be rotated in one direction about the rotary shaft in a semi-fixed rotation manner so that it can be easily repaired and replaced.

Each flange 12 is formed on the upper and lower sides of the cylinder 1 and secured to the flange of the fixed frame 8 and the weight support 9 using bolts or the like.

A motor 5 is provided below the cylinder 1 and the screw 2 is rotated by the driving force of the motor 5. The driving force of the motor 5 is transmitted to the screw 2 through the speed reducer 51, The synthetic resin raw material is extruded and discharged. The motor 5 and the speed reducer 51 are installed in an interior of a separate protection box under the ground surface to prevent the motor 5 and the speed reducer 51 from being damaged due to the influence of the external environment.

The cylinder heater 3 installed on the outer periphery of the cylinder 1 preferably has a jacket type and the heating temperature is preferably maintained at about 200 to 400 ° C.

In the present invention, electric resistance heating is exemplified. However, the present invention is not limited thereto, and induction heating or dielectric heating may be used. High frequency induction heating is effective for metal by heating by eddy current generated by induction coil, and dielectric heating is effective for dielectric heating by heating by dielectric loss.

In addition, a plurality of perforations 30 may be formed in the longitudinal direction of the body of the cylinder, as shown in FIG. 2, to insert the auxiliary heater 31. When the auxiliary heater 31 does not reach the target temperature with the cylinder heating heater 3, the heating is performed using a rod heater in which a heating wire made of a nichrome wire or a car body heating element is inserted.

In addition, as shown in Fig. 7 (A), a screw heating heater 80 may further be provided inside the screw. The inside of the screw can be filled with a fluid such as oil that can endure at 200 to 400 ° C. in an empty pipe form and heated with a screw heating heater 80 to rapidly melt the resin having a short residence time in a vertical downward direction. A capacity gauge (81) or a temperature sensor (82) can be installed at the top of the screw to adjust the amount and temperature of the oil. The electric connection to the screw heating heater 80 can be conducted by the rotary joint 91 and the bushing bearing 90 or the like.

As another embodiment of the screw heating heater 80, a pipe 801 that can be inserted into the screw or a heater can be used by inserting a heating wire 802 by forming a groove on the outer circumferential surface of the rod as shown in FIG. 7 (B).

On the other hand, the screw 2 may be installed in one or two or more, and is rotated to receive the driving force of the motor 5, thereby transferring the raw material of the synthetic resin to the lower part. In the case of two pairs of screws, one is rotated by a driving gear connected to the motor and the other is rotated by a driven gear which rotates in engagement with the driving gear.

A bearing 22 and a bushing are provided at the upper and lower ends of the screw 2 to support the rotation of the screw 2 so as to stably rotate against the pressure of the synthetic resin raw material, . However, since the present invention is installed at both ends to receive pressure uniformly, the extrusion efficiency can be increased and the service life of the screw (2) can be extended. .

At the lower end of the screw 2, an outwardly extending portion 21 is formed to extend outwardly downwardly inclined. The outwardly extending portion 21 is preferably formed such that its outer diameter is larger than the outer diameter of the screw 2 and smaller than the outer diameter of the screw 2.

The molten synthetic resin to be conveyed downward by the rotation of the screw 2 is guided and conveyed to a position deviated from the center of the screw 2 by the outwardly extending portion 21 and discharged to the extrusion port 42 of the molding die 4 do. At this time, the inner diameter of the corresponding cylinder is likewise expanded in a tapered form.

One of the vertical downward features of the present invention is that the pitch distance between the screw and the blade is narrower than the horizontal one. Since the raw material can be descended due to gravity, the pitch interval can be narrowed and the time for staying (residence time) can be increased to sufficiently dissolve. It is possible to produce more than horizontal type by narrow pitch interval, but this can be compensated by increasing the number of revolutions of the screw. The rotation of the screw is preferably 40 to 70 rpm, but is not limited thereto.

The lower end of the screw 2 is provided with a fixed bearing 52 for supporting the screw shaft and connected to the reduction gear 51 by a 5 to 6 sockets so that when the molding die 4 is replaced or maintained, Can be separated.

FIG. 3 is a bottom view of the molding die 4 according to the present invention, and a plurality of extrusion orifices 42 are formed so that the molten synthetic resin is extruded. In this embodiment, it is shown that a half-size extrusion orifice 42 is formed in a circular molding die, but this is an example, and the position and the distribution of the extrusion orifice can be adjusted so as to facilitate the collection of the compressed material.

The supporting die 43 of the molding die serves to axially support the rotating screw 2 like the upper bearing and to block the leakage of the melt and is formed together with the molding die 4, . Further, it is preferable that the width is the same as the width of the protruding portion on the bottom surface of the outward expanding portion 21 of the screw shaft. A through hole (41) is formed so that the rotational axis of the screw (2) passes. The through holes (41) are formed in a single or plural number depending on the number of the screws (2) installed.

Figure 4 shows the forming die of the inclined guide plate 44 in the embodiment using only half of the circular forming dies. However, it is preferable to use only one half of the molding die 4 in order to increase the collection efficiency, because it is difficult to collect the molded articles to be discharged in a circular shape. At this time, the other half of the unused half is preferably provided with an inclined guide plate 44 in the molding die so as to cause the molten material to move in one direction.

A cross cutter 7 may be provided at one side of the bottom of the molding die 4 for cutting the molding discharged from the molding die 4. The intersecting cutter 7 can be provided only on the side where the extrusion orifice 42 is formed and cuts the molded product discharged through the extrusion orifice 42 of the forming die 4.

5 shows an enlarged view of the leakage preventing means provided on the support base 43 of the molding die. A plurality of convex portions 431 for blocking the leakage of the molten synthetic resin are formed on the support base 43, And a concave portion 211 corresponding to the convex portion 431 is formed on the bottom surface of the outwardly extending portion 21 of the screw. Looking down on the plane, the mountains and valleys seem to have formed concentrically. The concave portion 211 of the screw is engaged with the convex portion 431 of the support and rotated.

By forming the convex portion 431 and the recessed portion 211, the leakage of the molten synthetic resin is blocked over a plurality of stages, so that the molten synthetic resin can be prevented from leaking outside, thereby protecting the equipment and preventing the loss of the raw material.

Particularly, it is preferable that a metal brush is formed at the upper end of the irregularities located in the middle of the plurality of convex portions 431, and a circular heater is embedded in the irregularities located inside. This is for filtering the unfused synthetic resin and for inducing it to flow to the extrusion port 42 side of the molding die 4 by heating and melting.

As shown in FIG. 6, a filtering means 6 for removing impurities contained in the synthetic resin can be inserted and detached at one side of the molding die 4.

The filtration means 6 includes a fixing plate 61 on which a plurality of bolt fastening holes 611 are formed and a filtering net 62 having a fine grid structure perpendicularly coupled to the inner surface of the fixing plate 61.

The filtration means 6 configured as described above serves to remove impurities contained in the molten synthetic resin, and the fixing plate 61 can be fixed or separated from the molding die 4 using bolts And sliding the filter net 62 in a sliding manner facilitates mounting and replacement.

The filtration unit 62 can be separated from the molding die 4 to facilitate cleaning or replacement of the filter unit 6, .

It is not necessary to install the filtration means in the case of a medium- or large-sized apparatus of 100 horsepower or more to be used for a fuel molding machine or the like,

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many obvious changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention should therefore be construed in light of the claims set forth to cover many of such variations.

1: Cylinder
11: inlet 12: flange
2: Screw
21: outward extending portion 22: bearing 211:
3: cylinder heating heater 31: auxiliary heater
4: Molding dies
41: through hole 42: extrusion port 43: support base 431: convex portion 44: guide plate
5: motor 51: speed reducer
6: Filtration means
61: fixing plate 611: bolt fastening hole 62:
7: Cross cutter 8: Fixing frame 9: Heavy weight support
80: Screw heating heater

Claims (6)

A cylinder (1) vertically installed by a support;
An inlet (11) provided at an upper end of the cylinder for introducing the raw material;
A screw (2) installed in the cylinder (1) in the longitudinal direction and driven by a motor (5) to extrude the synthetic resin raw material to the discharge side;
A cylinder heating heater (3) installed to surround the outer surface of the cylinder (1) and heating and melting the synthetic resin material fed by the screw (2);
A screw heating heater 80 installed inside the screw,
And a molding die (4) installed at the lower end of the cylinder (1) for extruding molten synthetic resin into a predetermined shape,
The melted synthetic resin is guided and conveyed to a position deviated from the center of the screw by the outwardly extending portion 21 formed at the lower end of the screw and extending downwardly inclined downward and discharged to the extrusion port 42 of the molding die Vertical downward gravity extrusion device. The method according to claim 1,
Wherein a plurality of perforations (30) are formed in the longitudinal direction inside the body of the lower cylinder to insert the auxiliary heater (31). The method according to claim 1,
Wherein the screw heating heater is heated with a fluid filled in a pipe and heated by a heating heater having a heating wire inserted into an outer circumferential surface of a pipe or a rod. The method according to claim 1,
A plurality of convex portions 431 for blocking the leakage of the molten synthetic resin are formed at regular intervals on the upper portion of the screw support 43,
And a concave portion (211) corresponding to the convex portion (431) is formed on a bottom surface of the outward expanding portion (21). The method according to claim 1,
The molding die is equipped with filtration means 6 for removing impurities contained in the synthetic resin so as to be insertable and separable,
The filtration means 6 includes a fixing plate 61 on which a plurality of bolt fixing holes 611 are formed and a filtering net 62 having a grid structure perpendicularly coupled to the inner surface of the fixing plate 61 Vertical downward gravity extrusion device. The method according to claim 1,
Characterized in that at the bottom of the shaping dice, intersecting cutter blades (7) for cutting the shaping material discharged from the shaping dies (4) are provided in interaction with each other.

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