JP2857434B2 - Extruder feeder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a raw material supply device for an extruder in an injection molding machine or the like.

(Prior Art) A screw extruder that melts and extrudes a resin in pellet form is provided with a hopper for supplying pellets. Usually, the amount of extrusion is determined by the metering zone of the screw,
The feed zone of the screw is supplied with pellets from the hopper in a full state. However, a special resin becomes overfeed or overpack, and causes overtorque. Therefore, it is necessary to use a starve feed in which the pellet supply amount is matched to the extrusion amount.
In addition, many of such special resins are vacuum or depressurized in order to degas the air-evolving monomers, and the hopper has an airtight vacuum hopper specification as a whole.

Conventionally, as this kind of raw material supply apparatus, there has been one as shown in FIGS.

That is, FIG. 5 shows that a vertical screw feeder 5 is provided in a hopper 1 so as to be connected to a raw material supply port 2 at a lower end thereof and an inlet 4 of an extruder 3, and the rotation speed of the screw feeder 5 is controlled or intermittently controlled. By rotating,
The pellets are supplied from the hopper 1 to the extruder 3.

FIG. 6 shows that a horizontal screw feeder 6 is provided between a hopper 1 and an extruder 3 as disclosed in, for example, Japanese Utility Model Publication No. 52-45665, and the screw feeder 6 is driven by a motor 7. Thus, the pellets in the hopper 1 are supplied to the extruder 3.

In FIG. 7, a rotary feeder 8 is provided between the hopper 1 and the extruder 3, and the pellets in the hopper 1 are supplied to the extruder 3 by the rotary feeder 8.

(Problems to be Solved by the Invention) In the supply device shown in FIG. 5, since the pellets have little friction, they are supplied by being spirally dropped between the blades of the screw feeder 5 by their own weight, and the supply amount cannot be controlled. .

On the other hand, in the case of FIG. 6, since the horizontal screw feeder 6 is used, there is no problem that the pered is dropped by its own weight. However, a space for providing the horizontal screw feeder 6 is required, and the casing 9 is provided. However, there is a disadvantage that the number of seal portions increases, such as a bent portion of the above.

In addition, in the case of FIG. 7, since the wings are separated into the chambers 10 by the rotary feeder 8, there is no problem due to their own weight falling as in the case of FIG. However, there is a disadvantage that the number of seal portions increases.

The present invention has been made in view of such conventional problems, and provides a raw material supply device that can be made compact without requiring an extra space, has a simple structure, can easily perform vacuum sealing, and can perform starve feed. .

(Means for Solving the Problems) The raw material supply device of the present invention is a raw material supply device for an extruder which supplies raw materials such as pellets from the lower end of the hopper 16 to the extruder. Within 15,
A plurality of partition walls 20, 2 so as to partition the inside of the cylindrical portion 15 up and down.
A partition plate 24 is provided so as to divide the space between two vertically adjacent partitions 20 and 21 into a plurality in the circumferential direction, and holes 27 and 28 is provided at different positions in the circumferential direction, and one of the partition walls 20, 21 and the partition plate 22 is attached to the vertical rotation shaft 26, and the other is attached to the cylindrical portion 15.

(Operation) When the raw material is supplied from the hopper 16, the rotating shaft 26 is intermittently or connected and rotated. Then, after the raw material in the hopper 16 sequentially fills each room 22 through the hole 27 of the partition wall 20,
When the hole 28 of the partition 21 corresponds to each room 22, the raw material
It falls downward from 28 and is supplied to the extruder 11.

(Examples) Hereinafter, the present invention will be described in detail with reference to the illustrated examples.
In FIG. 1, reference numeral 11 denotes a screw extruder attached to an injection molding machine, which comprises a screw 13 driven by a motor or the like in an extruder main body 12. In the extruder main body 12, an inlet 14 for the raw material to enter is formed upward, and the inlet 14
A hopper 16 for supplying the raw material is attached so that the lower cylindrical portion 15 communicates with the hopper 16. The hopper 16 is a closed structure having a lid 17, and is connected to a vacuum pump via a pipe 18.

As shown in FIGS. 2 to 4, a guide tube 19 is concentrically and removably fitted and fixed in the cylindrical portion 15 at the lower end of the hopper 16, and corresponds to substantially upper and lower ends of the guide tube 19. The two upper and lower partitions 20 and 21 are arranged as much as possible.
The inside of the guide cylinder 19 is vertically divided by 0 and 21. Three partition plates 24 are provided radially with respect to the boss portion 23 between the upper and lower partitions 20 and 21 so as to partition the inside into three rooms 22 in the circumferential direction. . Each partition plate 24 is fixed to the guide cylinder 19 and the cylindrical portion 15 with screws 25, 26 and the like.

Reference numeral 26 denotes a vertical rotation shaft. The rotation shaft 26 is rotatably inserted into the boss 23, and two partition walls 20, 21 are fixed to the rotation shaft 26 on both upper and lower sides of the boss 23. . Holes 27 and 28 for passing raw materials are formed in the two partition walls 20 and 21 by notches inward from the outer peripheral side so as to be located at positions opposite to each other.
Note that the partition wall 20 at the lower end is detachably attached to the rotating shaft 26 by a nut 29 or the like.

The rotating shaft 26 is connected to a transmission 31 via a coupling 30 at the upper end.
The transmission 31 is mounted on the lid 17 of the hopper 16 and is interlocked with the motor 34 of the lid 17 via the transmission shaft 33.

In the above configuration, the pellet inside the hopper 16 is a partition wall.
A room that passes downward from the hole 27 of 20 and is partitioned by the partition plate 24
Although it falls into the room 22, since the lower side of the room 22 is closed by the partition wall 21, it does not fall down and fills the room 22. Accordingly, when the rotating shaft 26 is intermittently rotated by the motor 34 and the holes 27 of the partition wall 20 are sequentially made to correspond to the respective rooms 22, the partition plate
Each room 22 partitioned by 24 is filled with pellets.
On the other hand, the pellets filled in each room 22 drop to the inlet 14 of the extruder 11 through the holes 28 when the holes 28 correspond to the respective rooms 22 due to the rotation of the partition 21 that intermittently rotates with the rotating shaft 26. I do. By repeating this, the pellets in the hopper 16 are supplied to the extruder 11. Therefore, by rotating the rotating shaft 26 intermittently and controlling the interval or the number of rotations, the supply amount can be controlled and the starve feed can be performed.

Further, structurally, the partition walls 20, 21 and the partition plate 24 are provided so as to fit inside the tubular portion 15 at the lower end of the hopper 16, so that the hopper 1
6 The supply section at the lower end may be a conventional short straight, and can be made compact without requiring extra space. Moreover,
It has a simple structure and can be easily sealed.

The control of the motor 34 is appropriately performed by feedback control or the like, and the motor 34 may be continuously rotated.

In the embodiment, the partition wall 24 is rotated and the partition plate 24 is fixed, but the partition wall 24 is fixed. However, the partition wall 20 and 21 may be fixed and the partition plate 24 may be rotated.

Further, three or more partitions may be provided in the vertical direction, and a plurality of rooms 22 may be provided in the vertical direction.

When the raw material changes and force feed is required, the lower part may be removed from the coupling 30 and replaced with a screw. Therefore, versatility is improved by making both of them interchangeable.

(Effects of the Invention) According to the present invention, a plurality of partition walls 20, 21 are provided in the cylindrical portion 15 at the lower end of the hopper 16 so as to partition the inside of the cylindrical portion 15 up and down.
In addition, a partition plate 24 is provided so as to divide the space between the two vertically adjacent partitions 20 and 21 into a plurality in the circumferential direction, and holes 27 and 28 through which the raw material passes are provided in each of the adjacent partitions 20 and 21. Are installed at different positions in the circumferential direction, and one of the partition walls 20, 21 and the partition plate 22 is attached to the vertical rotation shaft 26, and the other is attached to the cylindrical portion 15, so that up and down space is required. In addition to being compact, it has the advantages of a simple structure, easy vacuum sealing, and starve feed.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a cutaway side view showing the entire structure, FIG. 2 is a sectional view of a main part, and FIG. FIG. 4 is a cutaway perspective view of an essential part, and FIGS. 5 to 7 are configuration diagrams showing a conventional example. 11 ... extruder, 15 ... cylindrical part, 16 ... hopper, 19 ...
Guide tube, 20, 21 ... partition wall, 22 ... room, 24 ... partition plate, 26 ... rotating shaft, 27, 28 ... hole.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masanobu Kurashichi 2-3-1-10-506 Konan-cho, Higashinada-ku, Kobe-shi, Hyogo (72) Inventor Takeshi Takeshi 9-8-6, Honcho, Toyonaka-shi, Osaka (72) Inventor Hiroaki Kondo 1-3-3 Sumiyoshi Yamate, Higashinada-ku, Kobe, Hyogo Prefecture (72) Inventor Naoki Takeuchi 6-14-14, Minatojima-Nakamachi, Chuo-ku, Kobe-shi, Hyogo Prefecture D-907, (72) Inventor Kazuyama Kajiyama, Hyogo Prefecture No. 5, Midorigaoka, Okubo-cho, Akashi-shi (72) Inventor Susumu Nakamitsu 3-11-8-405, Sumiyoshihoncho, Higashi-Nada-ku, Kobe-shi, Hyogo (56) Reference JP-A-56-60632 (JP, A) JP-A-61-14930 (JP, A) JP-A-53-37764 (JP, A) JP-A-64-57021 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 45 / 18 B29C 47/10 B29C 31/04

Claims (1)

(57) [Claims] 1. A feeder for an extruder in which a raw material such as pellets is fed from a lower end of a hopper (16) to an extruder. A plurality of partitions (20) and (21) are provided so as to partition the inside of the shape part (15) up and down, and a plurality of partitions between the two vertically adjacent partitions (20) and (21) are formed in the circumferential direction. A partition plate (24) is provided so as to be partitioned, and holes (27) and (28) through which raw materials pass are provided in the adjacent partition walls (20) and (21) by changing the positions in the circumferential direction,
A raw material for an extruder characterized in that one of the partition walls (20) (21) and the partition plate (22) is attached to the vertical rotation shaft (26), and the other is attached to the cylindrical portion (15). Feeding device.