JPH065934U - Screw extruder - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a screw extruder capable of reliably engaging the material to be extruded with the threaded portion of the screw regardless of the material to be extruded. [Structure] A hopper cylinder 1 having a hopper opening 12
1 and the material to be extruded 14 such as rubber, which is installed on the hopper opening 12 and is kneaded by a kneader.
From the hopper cylinder 11, the screw 15 rotatably mounted in the hopper cylinder 11, and the pusher provided on the side of the hopper cylinder 11 for pushing the extruded material 14 toward the screw 15. In a screw extruder equipped with a device 16, a base 2a is supported on the lower part of the hopper chute 1 by the hopper chute 1, and the material to be extruded 14 in the hopper cylinder 1 is pushed down toward the screw 15 in a lowered state and is swingable. By providing such a damper 2, the material to be extruded can be surely caught in the screw portion of the screw regardless of the material to be extruded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw extruder for extruding a material to be extruded such as rubber supplied from a kneader toward a pelletizer, etc. It relates to something that can be bitten into a part.

[0002]

[Prior art]

 Conventionally, as this type of screw extruder, there is one shown in FIG.

In FIG. 4, a hopper opening 12 is provided at the upper end of a hopper cylinder 11 of this screw extruder. A hopper chute 13 is installed above the hopper opening 12. The material to be extruded 14, such as rubber or plastic, that has been kneaded by a batch-type kneader (not shown) placed above the hopper chute 13 from the hopper opening 12 It is designed to be supplied into the hopper cylinder 11. A screw 15 is rotatably mounted in the hopper cylinder 11, and a pusher device 16 for pushing the material to be extruded 14 toward the screw 15 is provided on a side portion of the hopper cylinder 11. The pusher device 16 has a pusher ram 18 fitted in a cylinder casing 17, and the pusher ram 18 is connected to a piston rod 19a of a drive cylinder 19 via a bracket 20. By extending and contracting the piston rod 19a, the pusher ram 18 can move back and forth toward the screw portion 15a of the screw 15.

Next, the operation of the screw extruder having such a configuration will be described. The material to be extruded 14 kneaded by a batch type kneader or the like passes through the hopper chute 13 and is supplied as a lump from the hopper opening portion 12 into the hopper cylinder 11. The pusher ram 18 of the pusher device 16 repeatedly advances and retreats toward the screw portion 15a of the screw 15, and a space A of varying size is provided between the tip 18a of the pusher ram 18 and the screw portion 15a of the screw 15. Is formed. The material to be extruded 14 supplied into the hopper cylinder 11 is deformed by its own weight and enters the space A. Then, as the pusher ram 18 advances toward the screw portion 15a of the screw 15, the extruded material 14 that has entered the space A is pushed toward the screw portion 15a of the screw 15. The screw 15 is rotating in the direction of the arrow R in the hopper cylinder 11, and the material 14 to be extruded is caught in the screw portion 15a of the screw 15 and is conveyed forward. Then, it is fed to a pelletizer or the like (not shown) provided at the outlet of the hopper cylinder 11 and extruded into a pellet shape or the like.

[0005]

[Problems to be solved by the device]

 In the screw extruder described in the prior art, the material to be extruded 14 supplied into the hopper cylinder 11 is deformed by its own weight and is formed between the tip 18a of the pusher ram 18 and the screw portion 15a of the screw 15. It enters the space A and is pushed by the pusher ram 18 toward the screw portion 15a of the screw 15. However, in recent years, an extremely hard material, which is an intermediate between plastic and rubber, has come to be processed by this screw extruder. When the material to be extruded is hard as described above, the material to be extruded is less deformed by its own weight, and therefore, as shown in FIG. 4, the material to be extruded 14 is at the point B of the screw portion 15a of the screw 15 and the cylinder casing 17. It may be in a bridge state with the point C and may not enter the space A. At that time, the pusher device 16 does not function effectively, and the extruded material 14 is caught in the screw portion 15a of the screw 15. It has a problem that it is not possible.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to reliably screw the extruded material regardless of the extruded material. The present invention aims to provide a screw extruder that can be engaged in the screw part of a screw.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned object, the screw extruder of the present invention comprises a hopper cylinder having a hopper opening, and a material to be extruded such as rubber kneaded by a kneader installed above the hopper opening. It is equipped with a hopper shoot that feeds into the hopper cylinder from the hopper, a screw that is rotatably mounted in the hopper cylinder, and a pusher device that is provided on the side of the hopper cylinder and that pushes the material to be extruded toward the screw. In the screw extruder, the hopper chute is provided with a swingable damper whose base is supported by the lower part of the hopper shoot and which pushes down the material to be extruded in the hopper cylinder toward the screw in a lowered state.

[0008]

[Action]

 Since the damper pushes down the extruded material in the hopper cylinder toward the screw in the lowered state, the extruded material is formed between the tip of the pusher ram and the screw part of the screw regardless of the extruded material. It enters the space and is pushed by the pusher ram toward the screw part of the screw.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a sectional view of a screw extruder according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. In FIGS. 1 and 2, the parts having the same functions as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

1 and 2, a hopper chute 1 of this screw extruder is provided with a damper 2 having a base 2a supported on a lower portion of the hopper chute 1. The damper 2 is swingable by a rotary actuator 3, and in the lowered state, the material to be extruded 14 in the hopper cylinder 11 is pushed down toward the screw 15 with a predetermined pressing force until the lower end position is reached. . Further, when the material to be extruded 14 is fed into the hopper cylinder 11 from the batch type kneader or the like arranged above, the damper 2 is retracted to the upper end position in the storage portion 1 a provided on the side portion of the hopper chute 1. However, it does not interfere with the material supply. In addition, a detection device such as a limit switch (not shown) is installed at an appropriate position of the damper 2, and the swinging of the damper 2 is automatically controlled by issuing an operation command of the rotary actuator 3 from this detection device. Has become.

Next, the operation of the screw extruder having the above structure will be described. In the state where the damper 2 is retracted to the upper end position in the storage portion 1a of the hopper chute 1, a mass of material to be extruded 14 is supplied into the hopper cylinder 11 from the hopper opening 12. Then, the damper 2 is lowered by the rotary actuator 3, and the extruded material 14 in the hopper cylinder 11 is pushed down toward the screw 15 with a predetermined pressing force. As a result, the material to be extruded 14 penetrates into the space A formed between the tip 18a of the pusher ram 18 and the threaded portion 15a of the screw 15 even if the material 14 is hard. When the pusher ram 18 advances toward the screw portion 15a of the screw 15, the extruded material 14 that has entered the space A is pushed toward the screw portion 15a of the screw 15, and the screw portion 15a of the screw 15 is pushed. Bite into. In this way, when the material to be extruded 14 is gradually bitten into the screw portion 15a of the screw 15 and carried forward, and the damper 2 reaches the lower end position, the detection device detects it and operates the rotary actuator 3. Issue a command to switch from falling to rising. As a result, the damper 2 rises to the upper end position and waits for the next material supply at this position. In this way, the damper pushes down the material to be extruded in the hopper cylinder toward the screw, so that the material to be extruded can be surely caught in the screw portion of the screw regardless of the material to be extruded. Therefore, this screw extruder can be applied to various polymer materials.

In the above-described embodiment, the case where the swinging direction of the damper is the direction toward the space A has been described, but as shown in FIG. Direction), and also in this case, the same effect as that of the above embodiment is obtained.

[0013]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Since the damper pushes down the material to be extruded in the hopper cylinder in the lowered state toward the screw, even if the material to be extruded is a hard material, the material to be extruded will not reach the tip of the pusher ram and the screw part of the screw. It penetrates into the space formed between the two and is pushed by the push ram toward the threaded portion of the screw. This makes it possible to reliably push the material to be extruded into the screw part of the screw regardless of the material to be extruded, and this screw extruder can be applied to various polymer materials. Becomes

[Brief description of drawings]

FIG. 1 is a sectional view of a screw extruder according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a cross-sectional view showing another damper.

FIG. 4 is a sectional view of a conventional screw extruder.

[Explanation of symbols]

 1 Hopper Chute 2 Damper 2a Damper Base 11 Hopper Cylinder 12 Hopper Opening 14 Extruded Material 15 Screw 16 Pusher Device 17 Pusher Ram

Claims (1)

[Scope of utility model registration request] 1. A hopper cylinder having a hopper opening, a hopper chute which is installed above the hopper opening, and which supplies an extruded material such as rubber kneaded by a kneader into the hopper cylinder from the hopper opening, and a hopper. In a screw extruder equipped with a screw rotatably mounted in the cylinder and a pusher device provided on a side portion of a hopper cylinder to push the material to be extruded toward the screw, the hopper chute has a base portion with a hopper. A screw extruder supported by a lower part of a chute and provided with a swingable damper for pushing down a material to be extruded in a hopper cylinder toward a screw in a lowered state.