JP2002210738A - Screw feeder for powdered raw material supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a long-time continuous operation by diminishing the extent to which a material sticking to a screw melt-deposits and thereby, decreases the cleaning frequency. SOLUTION: The screw feeder for supplying a powdered raw material is equipped with a feeder body 1, a trough 2 connected to the forward part of the feeder body 1, a perpendicular trough 6 connected to the tip of the trough 2 and a screw 7 inserted into the feeder body 1 and the trough 2. In this screw feeder, the tip side of the screw 7 serves as a shaft part 7a whose tip is allowed to penetrate the perpendicular trough 6 and an air vent 9 is formed running through the center of the screw 7 so that cooling air is ventilated through the screw 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw feeder for supplying a powder raw material.

[0002]

2. Description of the Related Art FIGS. 4A and 4B are diagrams showing the construction of a conventional screw type feeder for supplying a powder raw material, wherein FIG. 4A is a front view and FIG.

In FIG. 1, reference numeral 1 denotes a feeder body, and a trough 2 is connected to a front portion thereof.
A screw driving device 4 including a driving motor 3 and the like is connected to a rear portion, and a hopper 5 is connected to an upper portion. A vertical trough 6 is connected to the tip of the trough 2. A screw 7 is inserted into the feeder body 1 and the trough 2, and a rear end of the screw 7 is connected to a screw driving device 4. Above the screw 7 in the feeder main body 1, an agitator 8 that is rotated by the screw driving device 4 in conjunction with the screw 7 may be provided.

[0004] Various resin raw materials are supplied to the feeder in a fixed amount. As the resin raw material, an adhesive resin such as a surfactant or a flame retardant, or a material which has a low melting point and easily adheres to the screw 7 or the feeder main body 1 is preblended or supplied alone.

When the feeder is driven, as shown in FIG. 5, as time passes, the material A attached to the flight 7c of the screw 7 develops and fills the valley of the flight 7c of the screw 7, or the inner wall of the trough or The material A adhering to the inner surface of the feeder body may be solidified and the supply capacity may be reduced. In the case of a twin screw feeder,
There was also a problem that the material attached between the shafts developed and widened between the shafts, leading to shaft breakage.

[0006]

Heretofore, the feeder body and the trough have been naturally cooled or forcedly cooled by an external fan as required. Alternatively, the feeder body may have a jacket structure and may be forcibly cooled by cooling water or the like.

[0007] Natural cooling has little effect on low melting materials near ambient temperature.

[0008] Even if the feeder body and the trough are cooled by an external fan, it has not been possible to prevent the material from adhering and growing in the valley of the screw flight.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it has been possible to reduce the frequency of the material adhering to the screw and to reduce the frequency of cleaning, thereby enabling continuous operation for a long time. The purpose is to do.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, and a screw feeder for supplying a powdery material according to the present invention comprises a feeder body and a front portion of the feeder body. , A screw drive connected to the rear of the feeder body, a vertical trough connected to the tip of the trough, and a screw inserted inside the feeder body and the trough. The tip of the screw is a shaft, and the tip of the shaft is penetrated through a vertical trough, and is provided at the center of the screw through a vent hole.

Further, the tip of the screw is a shaft, the tip of the shaft is penetrated through a vertical trough and is fixed rotatably, and the tip of the screw has a heat dissipation shape. In this case, providing an external fan for cooling the tip of the screw increases the cooling effect.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings.

FIG. 1 is a block diagram showing a screw type feeder for supplying a powder material according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a feeder body. A trough 2 is connected to a front portion of the feeder main body 1, a screw driving device 4 including a drive motor 3 and the like is connected to a rear portion, and a hopper 5 is connected to an upper portion. A vertical trough 6 is connected to the tip of the trough 2. A screw 7 is inserted into the feeder body 1 and the trough 2, and a rear end of the screw 7 is connected to a screw driving device 4.
It is connected to the. Above the screw 7 in the feeder body 1, an agitator 8 that rotates in conjunction with the screw 7 may be provided.

In this embodiment, the tip of the screw 7 is a shaft 7a, and the tip of the shaft 7a is passed through the vertical trough 6, and a vent hole 9 is provided at the center of the screw 7.

It is more effective to supply cooling air from the tip end of the screw 7 to the ventilation hole 9 by an external fan or the like (not shown) and discharge the cooling air from the opposite side (drive side) to cool the entire screw.

FIG. 2 is a view showing the structure of a screw type feeder for supplying a powder material according to a second embodiment of the present invention.
3 is a front view, FIG. 3B is a side view, and FIG. 3 is a top view of FIG.

In this embodiment, the tip end of the screw 7 is a shaft 7a, and the tip of the shaft 7a is passed through the vertical trough 6 and fixed by a bearing 10. The tip of the screw 7 has a heat radiation shape 7 such as a wave shape or a blade shape so as to be easily cooled by a separate external fan 11 or natural cooling.
b. By rotating the external fan 11 and the screw 7, the tip of the screw 7 is cooled,
Heat transfer cools the entire screw.

[0019]

According to the present invention, since the screw is cooled, the adhesion of the material to the valley of the flight of the screw is reduced, so that the frequency of cleaning is reduced. Further, in the case of a two-screw screw feeder, failures such as deformation and breakage of the screw shaft due to adhesion of material between the shafts are reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a screw-type feeder for supplying a powder raw material according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a screw type feeder for supplying a powder raw material according to a second embodiment of the present invention, wherein (a) is a front view,
(B) It is a side view.

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a configuration diagram of a conventional screw-type feeder for supplying a powder raw material, in which (a) is a front view and (b) is a side view.

FIG. 5 is a view showing a state where a material is attached to an inner wall surface of the trough and an inner surface of the feeder main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Feeder main body 2 Trough 3 Drive motor 4 Screw drive device 5 Hopper 6 Vertical trough 7 Screw 7a Shaft part 7b Heat dissipation shape 7c Flight 8 Agitator 9 Vent hole 10 Bearing 11 External fan

Claims (2)

[Claims] 1. A feeder body (1), a trough (2) connected to a front portion of the feeder body (1), and a screw driving device (4) connected to a rear portion of the feeder body (1). A vertical trough (6) connected to the tip of the trough (2), a screw (7) inserted inside the feeder body (1) and the trough (2), and a screw inside the feeder body (1). In the screw feeder which is provided above (7) and comprises an agitator (8) which rotates in conjunction with the screw (7) by the screw driving device (4), the tip side of the screw (7) is used as the shaft (7a). A screw feeder for supplying a powdery raw material, characterized in that the tip of the shaft (7a) penetrates the vertical trough (6) and is provided through the vent hole (9) at the center of the screw (7). 2. A feeder body (1), a trough (2) connected to a front portion of the feeder body (1), and a screw driving device (4) connected to a rear portion of the feeder body (1). A vertical trough (6) connected to the tip of the trough (2), a screw (7) inserted inside the feeder body (1) and the trough (2), and a screw inside the feeder body (1). In the screw feeder which is provided above (7) and comprises an agitator (8) which rotates in conjunction with the screw (7) by the screw driving device (4), the tip side of the screw (7) is used as the shaft (7a). The tip of the shaft (7a) penetrates the vertical trough (6) and is rotatably fixed.
(b) A screw feeder for supplying a powdery raw material, characterized in that: