JPS59194921A - Screw feeder - Google Patents

Abstract

PURPOSE:To facilitate switching of the amount of feeding-out as well as enhance stability of the rate of flow during minor feeding amount, by furnishing a minor feed screw inside a cylinder, to which a screw blade is fixed at its outside surface. CONSTITUTION:No.1 screw 9 is installed inside a screw casing 6, which has one end provided with a supply hole 7 and other end with an exhaust hole 8. This screw 9 is composed of a cylinder 10 and a screw blade 11 fixed to the outside surface of said cylinder 10, and rotated by a gear box 12. In this cylinder 10 are formed a No.1 notch 13 to serve as minor feed cast-in part in the neighborhood of the above-mentioned supply hole 7 and exhaust hole 8 and a No.2 notch 14 to serve as minor exhaust part. A No.2 screw 15 rotated by also gear box 12 separately from the cylinder 10 is installed inside this cylinder 10, and an auger 17 is installed rotatably outside the notch 13 in such a way as surrounding the cylinder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw feeder capable of switching feeders.

Conventionally, this type of screw feeder has a first screw feeder with a different feedout amount per unit time, as shown in FIGS. 1 and 2. The second screw (3) (1g3) is placed horizontally or vertically. In addition.

In Figures 1 and 2, (1) is the casing, (2) is the raw material supply port, and in Figure 1 (3) and (4) are the large supply outlet and the small supply outlet, respectively. In Figure 2 (
5) is a common outlet for large supply and small supply.

In the case of horizontal placement, the discharge part becomes wider as shown in width (C), and the raw material receiver of the subsequent device that receives delivery from the screw feeder has a large opening. Also, the second
Because there is no force to push the raw material into the screw [F]),
The second screw Q3) cannot be reduced to tax f4a.

In the case of vertical installation, the head heights L1 and L2 differ between large supply and small supply, which causes variations in the dispensed amount when stopping fixed quantity, etc. Also.

Conventionally, there are systems in which the rotational speed of a single screw is varied to obtain large and small supply conditions, but in this case, the screw diameter becomes large relative to the rotational speed at low speeds, so the flow rate is reduced. There is a drawback that the flow rate is disturbed due to pulsation in synchronization with the rotation of the screw, and it is difficult to stably obtain the required flow rate.

Therefore, the present invention provides a screw feeder in which the dispensing amount can be changed, the head to the downstream device is constant regardless of the feeding speed, and the receiving port of the downstream device that receives the dispensing does not need to be enlarged. The purpose is to

The screw feeder of the present invention includes a screw casing having a supply port at one end and a discharge port at the other end,
A cylindrical body extending from the one end to the other end and rotatably supported around an axis is provided inside the screw casing, and a screw blade is provided on the outer peripheral surface of the cylindrical body to rotate the cylindrical body. The cylindrical body is configured to be driven to transfer the raw material between the screw casing and the supply port from the supply port to the discharge port, and the inside of the cylindrical body and the screw casing are arranged in the vicinity of the supply port of the screw casing of the cylindrical body. A small supply input part is provided in the vicinity of the discharge port of the screw casing of the cylindrical body, and a small supply discharge part is provided in the cylindrical body to communicate the inside of the cylindrical body with the inside of the screw casing. A screw is provided extending from the small supply input section to the small supply discharge section, and the screw is rotationally driven to transfer the raw material from the small supply input section toward the small supply discharge section within the cylindrical body. It is characterized by

An embodiment of the present invention will be described below with reference to FIG.

(6) is a cylindrical screw casing, with a supply port (7) formed at one end and a discharge port (8) formed at the other end. (9) is arranged inside the screw casing (6). The first screw is composed of a cylindrical body OQ extending from the one end to the other end, and a screw blade αη fixed to the outer peripheral surface of the cylindrical body C11, and the cylindrical body OQ is connected to the screw casing. (6) is connected to the output shaft of a gear box (2) disposed outside and is driven to rotate.The cylindrical body C11) has the supply port (7) and the discharge port (8). ), a first notch U serving as a small supply input portion and a second notch α serving as a small supply discharge portion communicating the inside of the cylindrical body σQ and the inside of the screw casing (6). is drilled. α is the second screw disposed inside the cylindrical body QQ, and the first
It extends from the notch 4 to the second notch σ→, and its drive shaft Q is rotationally driven by the gear box III (b) in a manner different from that shown in the cylindrical body diagram. aη is an auger disposed outside the first notch so as to surround the cylindrical body αQ, and is rotationally driven by the gear box (b) in a manner that is different from the cylindrical body αQ. In addition, the gear
Box (2) contains a cylindrical body αQ and a second screw (
In addition to the power transmission mechanism that specifically drives the auger αη and the auger αη, when the rotation of the cylindrical body QO is stopped, the first As shown in Fig. 8, the second notch (11cI4) faces the supply port (7), and the second notch σ7 faces the discharge port (8).
) is equipped with a cam/clutch mechanism that stops both sides at the same position.

With this configuration, the cylindrical body QO and the auger @ are driven to rotate during large supply, and the raw material supplied from the supply port (7) is transferred to the discharge port (8) by the screw blade CIη.
will be transported towards. At the time of small supply, the cylindrical body a1 is stopped, the second screw (g) and the auger aη are driven to rotate, and the raw material that has entered the inside of the cylindrical body C14 from the first notch □ is passed through the second screw α by the second notch Q4
from the second notch a◆ to the discharge port (8)
It is then discharged.

Looking in more detail at the operating conditions during large supply and small supply, we can see that during large supply, the auger aη pushes the raw material into the cylindrical body αQ, and the screw blade συ acts to facilitate the horizontal feeding of the raw material. , auger a at the time of small supply
When η pushes the raw material into the cylindrical body αQ, the stopped screw blade Ov acts as a wall and the raw material flows into the first
Even if the second screw (t) is made smaller, smooth small supply can be expected.

In addition, in the above embodiment, the cylindrical body GO and the auger αη were driven to rotate in a special manner at the time of large supply;
A large supply can also be achieved by rotationally driving the auger αη, the auger αη, and the second screw, and driving one rotation is not particularly special, and two or eight of them may be rotationally driven in synchronization.

Further, in the above embodiment, the screw blade συ is not provided in the entire area of the cylindrical body C1l, but is provided in the first notch □
It is provided in the area excluding the section □□.

The same effect can be obtained by providing the first notch in the section of the screw blade CI] and arranging the auger aη outside the screw blade ση as shown in FIG.

In the above embodiment, the first. Second screw (9) Q5
Although it has been explained that each of the screw feeders rotates at a fixed specific speed, by providing a driving source for each of the screw feeders and making the speed variable, it is possible to create a screw feeder with a wide range of performance.

As explained above, according to the screw feeder of the present invention, since the screw for small feeding is provided inside the cylindrical body to which the screw blade is fixed on the outer circumferential surface, the screw feeder is compact, and when the screw blade is used for large feeding, the screw feeder is compact. Since the head height can be the same as when a small supply is made, and discharging can be performed from one discharge port, there is no need to enlarge the receiving port of the subsequent device. Furthermore, the present invention is capable of stabilizing the flow rate, especially when supplying small amounts, compared to the conventional method in which the supply speed is changed by changing the rotational speed of a single screw.

[Brief explanation of the drawing]

Figure g1 (a) (b) is a front longitudinal cross-sectional view and paddy cross-sectional view of a conventional 1ffk type screw feeder, and Figure 2 (a) (
b) is a front longitudinal sectional view and a horizontal sectional view of a conventional vertical screw feeder, FIGS. 8 and 4 are a front longitudinal sectional view and a horizontal sectional view of an embodiment of the present invention, and FIG. Front view of example
FIG. (6)...Screw casing, (7)...Supplementary m
Port, (81...W outlet, (9)...first screw, αQ...cylindrical body, Qυ...screw blade, (2)...gear box, μs... 1st notch [small supply input part], (b)..., 2nd notch [small supply discharge part], αt... 2nd screw. ση...Auger agent Yoshihiro Morimoto 1st Figure 2

Claims (1)

[Claims] 1. A screw casing having a supply port at one end and a discharge port at the other end is provided, and the screw casing extends from the one end to the other end and is rotatable about an axis. A pivoted cylindrical body is provided, a screw blade is provided on the outer peripheral surface of this cylindrical body, and the cylindrical body is rotationally driven to transfer the raw material between it and the screw casing from the supply port to the discharge port. Along with configuring it like this. A small supply inlet part for communicating the inside of the cylindrical body and the inside of the screw casing is provided at a position near the supply port of the screw casing of the cylindrical body, and a small supply input part is provided at a position near the discharge port of the screw casing of the cylindrical body. A small supply/discharge part is provided that communicates the inside of the body with the inside of the screw casing, and a screw is provided inside the cylindrical body extending from the small supply input part to the small supply/discharge part, and this screw is driven to rotate. A screw feeder whose interior is configured to transfer raw materials from a small supply input section to a small supply discharge section.