JPH09109232A - Foreign matter discharging device for extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to clean the filtering surface of a filter member without disassembling an extruder and to facilitate the mounting of the existing extruder and the operation. SOLUTION: A foreign matter discharging casing 1c is connected between the discharge side of an extruder body 2a and a die head 2b, an insertion hole 6 for passing the casing 1c is formed, a rod member 7 rotatable around the shaft is provided, and the molten resin introducing inlet 8 connected to the discharge side of the body 2a is formed at the casing 1c. An extrusion outlet 9 and inlet 8 connected to the head 2b are so formed as to be disposed at the same height as the inlet 8 axially symmetrically to the body 2a at the casing 1c, an inverting passage 11 communicating with the inlet 8 and the outlet 9 and with the inlet 8 and foreign matter discharge port 10 is formed at the member 7, and a filter member 17 is so provided in the passage 11 as to cross it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foreign substance discharging device connected between a discharge side of an extruder main body and a die head, and more particularly to filtration by a filter member located upstream of the die head of the extruder. The present invention relates to a foreign substance discharging device for an extruder, which can clean impurities and foreign substances in the molten resin thus produced by utilizing the flow of the molten resin.

[0002]

2. Description of the Related Art Plastic extruders are injection molding machines,
It is a major component of blow molding machines and extrusion molding machines.

At present, as a measure against the waste problem, recycling of plastics in a factory and recycling of recovered plastics are required. However, these recycled plastics contain impurities such as dust, or rarely foreign substances such as bolts and nails. Therefore, in order to reuse the recycled plastic, it is essential to incorporate a screen device for removing impurities and foreign substances into the extruder in order to simplify the production process.

As shown in FIG. 5, the extruder 41 has a hopper 44 for loading plastic pellets P on one side.
And a screw 46 provided through the barrel 45, and a die head portion 43 provided at the tip of the barrel 45. A heater band 49 for melting the pellet P is provided on the barrel 45 so as to surround the barrel 45. Further, the screw 46 includes a rotation transmission device 4 for rotating the screw 46.
7 and the motor 48 are connected.

The conventional filter member 40 is sandwiched between the extruder body 42 of the extruder 41 and the die head 43, and a mesh-shaped screen pack 40a constructed by stacking stainless wire meshes. And a breaker plate 40b having a large number of holes in a honeycomb shape. The screen pack 40a restricts the flow of the molten resin R, increases the pressure in the extruder, improves the kneading of the molten resin R, and filters fine impurities and foreign matters in the molten resin R. Breaker plate 40
b supports the screen pack 40a. The impurities and foreign substances filtered by the filter member 40 are filtered by the filtering surface of the screen pack 40a. But,
When this filtration is continuously performed, impurities and foreign substances mixed in the molten resin R cause clogging of the filtration surface. If the filtration surface is clogged, the pressure of the molten resin R in the extruder main body 42 increases, causing a pressure loss of the filter member 40. Therefore, the filtration surface must be washed.

[0006]

However, since the breaker plate and the screen pack in the conventional filter member 40 are sandwiched between the extruder body 42 and the die head portion 43 of the extruder 41, Molten resin R filtered on the filtering surface of the screen pack
In order to remove impurities and foreign matters therein, the bolt B joining the extruder body 42 and the die head portion 43 had to be removed and the extruder 41 had to be disassembled.
Further, there is a problem that the operation of the extruder 41 has to be stopped and the molten resin R is greatly lost due to the disassembly of the extruder 41.

FIG. 6 shows an example in which a filter member provided separately from the extruder is applied to the extruder. The same reference numerals are used for the same members as in FIG.

As shown in FIG. 6, since the screen pack (screen sheet 50a) provided in a roll shape is provided so as to be freely wound, impurities and foreign matters in the molten resin R filtered on the screen sheet 50a are removed. It is not necessary to disassemble the extruder 51 for removing and replacing the screen sheet 50a. However, since the control of the filter member 50 is complicated and it is difficult to maintain the sealing property, there is a problem that the cost of the extruder 51 is increased.

[0009]

In order to achieve the above object, the invention of claim 1 connects a foreign matter discharge casing between the discharge side of the extruder body and the die head portion, and the foreign matter discharge casing is connected to the foreign matter discharge casing. An insertion hole penetrating this is formed, a rod member rotatable about its axis is provided in the insertion hole, and a molten resin introduction port connected to the discharge side of the extruder body is formed in the foreign matter discharge casing. At the same time, in the foreign matter discharge casing, an extrusion port and a foreign matter discharge port connected to the die head part are formed so as to be line-symmetrical to the axis of the extruder main body and at the same height as the molten resin introduction port. Then, the rod member is formed with an inversion passage that connects the molten resin introduction port and the extrusion port and also connects the molten resin introduction port and the foreign matter discharge port, and crosses the inversion passage in the inversion passage. To filter It is provided with a member.

According to a second aspect of the present invention, the reversing passage is formed in a Y-shape that allows the molten resin introducing port, the extruding port, and the foreign matter discharging port to communicate with each other at the same time. The filter member is provided.

According to the above structure, since the rod member is rotatably provided, even if the filtering surface of the filter member is clogged with impurities and foreign matters in the molten resin, the rod member is rotated to melt. The filtration surface of the filter member can be washed using the flow of resin, and the filtration can always be performed using a clean filtration surface.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an example of application of the foreign matter discharging device of the present invention to an extruder. The same reference numerals are used for the same members as in FIG.

As shown in FIG. 1, the extruder 2 has a barrel 3 having a hopper 20 for loading plastic pellets P on one side, a screw 4 inserted through the barrel 3 and a tip of the barrel 3. Foreign object discharge device 1 provided
And a die head portion 2b which is orthogonal to the axis of the barrel and is provided on the side portion of the foreign matter discharging device 1. A heater band 23 for melting the pellet P is provided on the barrel 3 so as to surround the barrel 3. Further, a rotation transmission device 21 and a motor 22 for rotating the screw 4 are connected to the screw 4.

The foreign matter discharging apparatus of the present invention will be described with reference to FIGS. Incidentally, FIG. 3 shows a sectional view taken along the line aa of FIG.

As shown in FIGS. 2 and 3, the foreign matter discharging device 1
Is composed of a foreign matter discharge casing 1c and a rod member 7 having a filter member 12.

As shown in FIG. 3, the foreign matter discharge casing 1c has an octagonal prism shape, and the foreign matter discharge casing 1c is provided with an insertion hole 6 penetrating therethrough, and the extruder body 2a is also provided. A molten resin introduction port 8 connected to the discharge side of the molten resin, and further, an extrusion port 9 and a foreign substance which are line-symmetrical to the axis of the extruder main body 2a and are connected to the die head part 2b located at the same height as the molten resin introduction port 8. And an outlet 10.

Outside the molten resin introduction port 8 and the extrusion port 9, flanges 1a and 1b are provided for joining the extruder main body 2a and the die head 2b, respectively. The flanges 1a and 1b are provided with bolt holes 14 for joining the foreign matter discharge casing 1c and the extruder body 2a and inserting bolts (not shown) for joining the foreign matter discharge casing 1c and the die head portion 2b. There is. The foreign matter discharge casing 1c may have any shape, and may have a polygonal column shape. Further, the foreign matter discharge casing 1c and the extruder main body 2
The joining of a and the die head portion 2b may be performed by welding.

The filter member 12 is composed of breaker plates 12a, 12a and a screen pack 12b. The breaker plates 12a, 12a are disk-shaped, and a large number of holes (for example, φ3 to φ5) are formed in a honeycomb shape in the central portion facing the molten resin introducing port 8. The screen pack 12b is held between the breaker plates 12a and 12a, and is formed by stacking stainless steel wire mesh (for example, 150 to 250 mesh).

The rod member 7 includes a body portion 7a and a head portion 7
It is composed of b and a ring nut portion 7c. The body portion 7a has a cylindrical shape, and a male screw portion 15a is formed at one end of the body portion 7a. A head portion 7b is attached to the other end of the body portion 7a.
A female screw portion 15b is formed on the inner diameter portion of the ring nut portion 7c so as to be screwed into the male screw portion 15a of the body portion 7a. The body portion 7a is provided with a reversing passage 11 that connects the molten resin introducing port 8 and the extruding port 9 with each other and the molten resin introducing port 8 and the foreign matter discharge port 10 with each other.

In order to seat a filter member 12 for removing impurities and foreign matters in the molten resin R on the reversing passage 11, as shown in FIG. 3, a first expanded diameter portion 11a.
The second expanded portion 11b is formed so that the spring plate 12c for pressing the filter member 12 and the pressing ring 13 can be inserted. Further, in the circumferential direction of the head portion 7b and the ring nut portion 7c, rotation holes 15 for fastening and fixing the rod member 7 to the foreign matter discharge casing 1c are formed at regular intervals.

The filter member 12 is seated on the first enlarged diameter portion 11a of the reversing passage 11 formed in the body portion 7a having the head portion 7b. Then, in order to fix the filter member 12, the spring plate 12c and the pressing ring 13 are fixed.
Is inserted into the second expanded diameter portion 11b.

Next, the body portion 7a, after fixing the filter member 12, is inserted into the insertion hole 6 of the foreign matter discharge casing 1c. After that, the rod member 7 is fixed to the foreign matter discharge casing 1c by screwing the ring nut portion 7c into the body portion 7a. At this time, the reverse passage 11 is fixed so as to communicate with the molten resin introduction port 8 and the extrusion port 9 of the foreign matter discharge casing 1c, and the foreign matter discharge casing 1c and the head portion 7b of the rod member 7 can be discriminated so that the communicating positions can be determined. You may mark both and.

In the foreign matter discharging device 1 in which the rod member 7 is fixed to the foreign matter discharging casing 1c, the flanges 1a and 1b of the foreign matter discharging casing 1c are joined to the extruder main body portion 2a and the die head portion 2b by bolts (not shown). And is set in the extruder 2.

Next, the operation of the embodiment will be described.

The molten resin R kneaded by the screw 4 is extruded through the barrel 3 to the molten resin inlet 8. The molten resin R introduced into the molten resin introduction port 8 has coarse impurities and foreign substances mixed in the molten resin R by the breaker plate 12a, fine impurities and foreign substances removed by the screen pack 12b, and the extruded pipe 5 of the die head portion 2b. Is extruded into.

The impurities and foreign substances filtered by the filter member 12 are filtered by the filtering surface of the filter member 12 (the surface on the radially outer side of the rod member 7). If filtration is continued, impurities and foreign matters in the molten resin R will be deposited on the filtration surface of the filter member 12 and cause clogging. Therefore, the filter member 12 must be appropriately washed.

As shown in FIG. 3, in the present invention, by reversing the reversing passage 11 of the body portion 7a, the filtering surface of the filter member 12 goes from the molten resin introducing port 8 side to the foreign matter discharging port 10 side. Be directed. That is, by reversing the rod member 7, the filtration surface of the filter member 12 can be cleaned by utilizing the flow of the molten resin R. Further, since the outlet through which the molten resin R is pushed out and the outlet through which the foreign matter is discharged are separate, there is no possibility that the clean molten resin R in which the impurities and the foreign matter are filtered and the impurities and the foreign matter are mixed with each other.

In the present invention, although there is some loss of the molten resin R when the filtration surface is washed, the loss of the molten resin R is much smaller than when the conventional extruder is disassembled to wash the filter member. . Furthermore, in the conventional case, in order to wash the filter member, the operation of the extruder had to be stopped, but in the present invention, the filter member is washed without stopping the operation of the extruder. be able to.

Further, in the case of a conventional filter member for filtering by winding a screen sheet provided in a roll shape,
In order to wind the screen sheet freely for insertion and removal, it is necessary to form a slit in the barrel for the thickness of the screen sheet even if it is the thinnest, and it is possible to prevent impurities and foreign substances from falling out of the molten resin filtered by the screen sheet. The slit in the barrel should be as large as possible in order to remove it. However, there is a problem that the slit of the barrel must be made as small as possible in order to maintain the sealing property of the molten resin.

In the present invention, when the filter member is washed, only the rod member is turned over, so that the foreign matter discharge casing and the rod member can be easily sealed. Further, since the foreign matter discharging device of the present invention is only joined between the extruder main body part and the die head part of the existing extruder, there is no need to newly renew the equipment and the cost can be reduced.

Next, another embodiment of the present invention will be described with reference to FIG. The same reference numerals are used for the same members as in FIG.

As shown in FIG. 4, the foreign matter discharge casing 1
c is a foreign matter discharge casing 1c having a hexagonal column shape, and an insertion hole 6 penetrating therethrough.
A molten resin introduction port 8 connected to the discharge side of the molten resin, and further, an extrusion port 9 and a foreign substance which are line-symmetrical to the axis of the extruder main body 2a and are connected to the die head part 2b located at the same height as the molten resin introduction port 8. And a discharge port 30.

The reversing passage 35 formed in the body portion 7a of the rod member 7 is formed in a Y shape so that the molten resin introducing port 8, the extruding port 9 and the foreign matter discharging port 10 can be communicated at the same time. The inversion passage 35 has a filter member 36 at each end.
a, 36b, 36c are provided.

A foreign matter discharge member 32 is attached to the foreign matter discharge port 30. The foreign matter discharge member 32 has a foreign matter discharge nozzle 33 inside the foreign matter discharge member 32, and a valve 34 is attached in the middle of the foreign matter discharge nozzle 33 to adjust the flow of the foreign matter. The foreign matter discharging device 31 and the extruder main body portion 2a and die head portion 2b are joined by welding.

The foreign matter discharging device 31 of this embodiment has the foreign matter discharging member 32 attached to the foreign matter discharging port 30, so that when the extruder (not shown) is operated with the valve 34 closed, the molten resin R Does not flow to the foreign matter discharge port 30, and the molten resin R from which impurities and foreign matter are filtered is extruded from the extrusion port 9.

When the molten resin R is continuously filtered,
Since the molten resin R accumulates on the filtration surface of the filter member 36a (the outer surface in the radial direction of the rod member 7) and causes clogging, the filtration surface must be washed. To clean the filtration surface, the rod member 7 is rotated in the counterclockwise direction in the figure, so that the filtration surface of the filter member 36a, which is directed to the molten resin inlet port 8, has a foreign matter discharge port 30.
The filter member 36b facing the extrusion port 9 faces the molten resin introduction port 8 again.

When the valve 34 is opened when the rod member 7 is rotated, impurities and foreign matters in the molten resin R deposited on the filtration surface of the filter member 36a can be washed by the flow of the molten resin R, and the extrusion port can be washed. In No. 9, the molten resin R in which impurities and foreign substances are filtered is obtained. If the filter member 36a is damaged, it can be replaced at this time. That is, filtration and extrusion of the molten resin R and washing of the filtration surface of the filter member 36 or replacement of the filter member 36 can be performed at the same time.

In addition, in the present embodiment in which the reversing passage 35 is formed in a Y shape and the filter members 36a, 36b, 36c are attached to the respective ends of the reversing passage 35, the same effect as that of the present invention can be obtained. Of course, it will work.

[0040]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) The filtration surface of the filter member can be washed without disassembling the extruder.

(2) Since impurities and foreign substances and clean molten resin have different outlets, there is no possibility of mixing them.

(3) It is easy to attach to an existing extruder and easy to operate.

[Brief description of the drawings]

FIG. 1 is a diagram showing an application example of a foreign matter discharging device of the present invention to an extruder.

FIG. 2 is a diagram showing a foreign substance discharging device of the present invention.

FIG. 3 is a sectional view taken along line aa of FIG. 2;

FIG. 4 is a view showing another embodiment of the foreign matter discharging device of the present invention.

FIG. 5 is a diagram showing an example of application of a conventional filter member to an extruder.

FIG. 6 is a diagram showing an example of application of a conventional filter member using a screen sheet to an extruder.

[Explanation of symbols]

 1 Foreign Material Discharge Device 1c Foreign Material Discharge Casing 2 Extruder 2a Extruder Main Body 2b Die Head Part 6 Insertion Hole 7 Rod Member 8 Molten Resin Introducing Port 9 Extrusion Port 10 Foreign Material Discharging Port 11 Inversion Passage 12 Filter Member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshinori Ishikawa 1 Shinshinakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries, Ltd. Yokohama Engineering Center

Claims (2)

[Claims] 1. A foreign matter discharge casing is connected between a discharge side of an extruder main body and a die head portion, and an insertion hole penetrating therethrough is formed in the foreign matter discharge casing.
A rotatable rod member is provided around the shaft, a molten resin introducing port connected to the discharge side of the extruder body is formed in the foreign matter discharge casing, and the foreign matter discharge casing is provided with An extrusion port and a foreign substance discharge port connected to the die head portion are formed so as to be located in line symmetry with the axis and at the same height as the molten resin introduction port, and the rod member is provided with the molten resin introduction port and the pushing member. An extruder characterized in that a reversing passage is formed which communicates with the outlet and also communicates the molten resin introducing port and the foreign matter discharging port, and a filter member is provided in the reversing passage to cross the reversing passage. Foreign matter discharging device. 2. The reversing passage is formed in a Y-shape that simultaneously connects the molten resin introducing port, the extruding port and the foreign matter discharging port, and the filter member is provided at each end of the reversing passage. The foreign matter discharging device for an extruder according to claim 1.