JPS6032019Y2 - screw feeder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a screw feeder for transporting bulk materials such as garbage.

Conventionally, a screw feeder used for supplying waste to a fluidized bed incinerator, etc., has a screw casing constructed by combining a cylindrical casing 21 with a tapered casing 22, as shown in a schematic longitudinal cross-sectional view in FIG. 1, for example. A screw 24 driven by a drive device 23 is provided, and the screw 24 moves the waste thrown in from the input hopper 25, compresses it in the taper casing 22, and moves it further while performing material sealing, and the waste is moved through the outlet opening 26. It has become more emissive.

However, in a screw feeder having such a structure, the waste thrown into the input hopper 25 is
When the dust enters between the screw blades 27 of No. 4 and is pushed into the cylindrical casing 21, rod-shaped bodies and hard lumps of dust get caught between the screw blades 27 and the front end wall 28, preventing the screw 24 from rotating. If the transfer is stopped or the screw blade 27
This has the drawback of causing damage to the screw feeder, which seriously impedes the operation of the screw feeder.

In order to improve this drawback, the application was made in 1973-13573 (
The invention related to Japanese Utility Model Application No. 55-54245) is a screw at the intersecting inner corners of the cylindrical casing 21 below the front end wall 28, as shown in FIG. It has been recognized that creating an introduction space 29 that extends diagonally just above the front end wall 24 has a remarkable effect on stopping the transfer of dirt and eliminating damage to the blades caused by getting caught in the front end wall 28.

However, it has been found that a phenomenon occurs in which the garbage does not enter the introduction space 29 during operation when the garbage is stored in the input hopper 25.

The purpose of this invention is to improve the garbage input hopper so that it gradually and smoothly enters between the screws and moves through the screw casing even more smoothly.

As shown in FIG. 2, the garbage stored at a height hl in the input hopper 25 tends to be moved toward the front end wall 28 of the input hopper 25 as the screw blade 27 rotates, so that the front end In the vicinity of the wall 28, the garbage is compacted and a bridge is formed, which is difficult to eliminate.

To avoid this, the horizontal movement of the dirt toward the front end wall 28 can be suppressed, and the dirt can be fed between the screw blades 27 and introduced sequentially from the end.

This idea was made based on the above considerations.The casing has an input hopper at the top of one end and an outlet opening at the other end.Inside the casing, a screw blade is rotatably supported around a horizontal axis. The screw feeder has an outer diameter shape in which the outer diameter of the screw blade gradually increases from the feed start end to the screw blade on the front end wall of the input hopper by a leap pitch from the screw blade located directly below S. The front end wall of the input hopper is located from the screw blade directly below S.
The pitch from the screw vane on the front end wall of the input hopper to the screw vane at the feed start end is from the screw vane directly below S. In order to further increase the effect, an introduction space is provided at the corner of the input hopper and the screw casing.

Embodiments of this invention will be described below with reference to the drawings.

FIG. 3 is a longitudinal sectional view of the screw feeder of this invention.

A tapered casing 2 having a taper is fixed to the tip of the cylindrical casing 1, and an input hopper 3 is formed in the upper part of the cylindrical casing 1, which constitutes a screw casing, and a shaft 4 and a screw blade 5 wound around the shaft 4. A screw 6 is constructed, and the shaft 4 is fixed to the output shaft end of a drive device 7 and rotatably held within the screw casing.

The outer diameter of the screw blade 5 gradually increases from the feed start end 9 to the screw blade 12 located one pitch from the screw blade 11 directly below the feed end 9 on the front end wall 8 of the hopper 3 to the feed start end 9 side. The screw vanes 11, 12 have the same outer diameter, and the screw vanes 5. ,L2
The outer diameter of 95-3 is D1. D2. If D3 is Dl〈
D2<D3<D Generally, screw blade 1 is better than screw blade 5-1.
If there are n pieces up to 2, then D<D2<...Dn-1
(Dn(D), the pitch between the screw blades 11 and 12 is P, the pitch P1 between the adjacent screw blades 5-t=5-2 between the feed start end 9 and the screw blade 12, Feather 5-
If the pitch between 2 and 5-3 is P2, and the pitch between screw blades 5-3 and 12 is P3, then P > P1? P2? P3, and generally P>P1=P2...Pn.

Also, their pitches are Pl, <P2...<Pn<P
You can also use it as

The pitch from the screw blade 11 to the screw blade 14 adjacent to the outlet opening side is larger than the pitch P.

An introduction space 13 is provided above the screw 6 where the front end wall 8 of the input hopper 3 intersects with the cylindrical casing 1, as shown in FIG. 3 and FIG. 4, which is a sectional view taken along line AA in FIG.

The introduction space 13 has a shape in which the cross-sectional area between the ceiling of the space and the outer diameter of the screw blade 5 gradually decreases, and a slip prevention blade 15 is fixed to the cylindrical casing 1 in the axial direction directly above S. There is.

The axial shape of the introduction space 13 and the cutting edge of the spin prevention blade 15 do not have to be straight.

Next, we will discuss the operation of the screw feeder of this invention.

When the drive device 7 is energized, the shaft 4 rotates in the direction of the arrow shown in FIG. 3, and thus the screw blade 5 rotates.

The screw blade 5 is rotating, and the state in which garbage is inputted from the input hopper 3 and stored is operated as follows.
When the feed end screw blade 5-1 rotates N times to fill the space between the adjacent screw blades with dirt and feed it by a pitch P1, the amount of transport of the next screw blade 5-2 is -(D - D). ΔP, N However, since the screw feeding capacity is greater by the number of revolutions of ΔP1=P2 Pt N=, the part of the screw blade 5-2 accommodates and sends out the extra garbage in the input hopper 3 by that amount. .

Similarly, between screw blade 5-2 and screw blade 5-3! There is an increment in the sending capacity of (Tada)・ΔP2N, and in general, (DLt DH) APkN (1 (= 1. 2-
, , .

n-□) Adjacent screw blades 5-1t 5-29
5-3. It is between...

Therefore, the garbage in the input hopper 3 can be sent out between the screw blades 5-1 and 12 while taking in each screw blade garbage.

The distance between the outer diameter of the screw blade between the feed start end 9 and the screw blade 12 and the cylindrical casing 1 gradually becomes narrower, so the feed start end 9
In this case, the ratio of the amount of dust taken in from the vicinity of the screw blade 5-1 is smaller, and as it approaches the screw blade 12, the ratio of dust taken in from the input hopper 3 side increases.

The diameters between the screw blades 11 and 12 are the same D, and only the pitch P is large, so that the taking-in action is small and the feeding action is mainly performed.

The garbage sent into the introduction space 13 from the front end wall 8, which is larger than the pitch P from the screw blade 11 to the screw blade 14 on the exit opening side, is transferred to the screw blade 14 on the exit opening side following the screw blade 11.
The waste is forced into the tapered casing 2 by the wedge action of the introduction space 13, and the waste is gradually compressed and material-sealed in the tapered casing 2, and then sent out from the outlet opening.

In the above, for the sake of explanation, each screw blade is divided into integer numbers, but starting from the feed start end 9, the screw blade 11
Until then, the diameter and pitch gradually change continuously.

Looking at the garbage movement in input hopper 3, the garbage is vertically S.
``On average, it moves in parallel and is taken between the screw blades 12 from the feed start end 9, and is fed downward in the axial direction along the top of the screw 6 by the feed of those screw blades, but at the beginning of the feed Due to the capture action between the end 9 and the screw vane 12, the amount of movement is small and the dirt is not pressed too hard against the front end wall 8.

In other words, it is sent by screw blades.

Therefore, since no partial stagnation occurs in the charging hopper 3, no bridging occurs.

As described above, according to the screw feeder equipped with the screw blades of this invention, the inside of the input hopper is leveled, and the garbage descends and is evenly divided and taken in and fed by each screw blade, causing bridging and clogging. There is no possibility of overloading the screw blades and causing damage.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of a conventional screw feeder, Figure 2 is a partial vertical sectional view of an improved screw feeder, and Figure 3 is a vertical sectional view of a conventional screw feeder.
The figure is a longitudinal sectional view of the screw feeder of this invention, and FIG. 4 is a sectional view taken along line AA in FIG. 1... Cylindrical casing, 2... Taper casing, 3... Input hopper, 5. 5
,, 5-2* 53...Screw blade, 6...
...Screw, 7...Drive device, 8...
...Front end wall, 9...Feeding start end, 11,1
2...Screw blade, 13...Introduction space,
14... Screw blade, 15... Drifting prevention blade.

Claims (1)

[Claims for Utility Model Registration] 1. A screw feeder in which a screw is rotatably supported about a horizontal axis in a screw casing having an input hopper at the top of one end and an outlet opening at the other end. From the screw blade at the feed start end, the screw blade on the front end wall of the input hopper is pitched from the screw blade directly below S. The outer diameter of the screw blade gradually increases toward the screw blade at the feed start end. The front end wall of the hopper is one pitch from the screw vane directly below S. Each pitch between the screw vanes at the end of feed start. The front end wall of the hopper is one pitch between the screw vane directly below S. A screw feeder comprising a screw having a larger pitch between the screw and the blade. 2. The front end wall of the input hopper from the feed start end has a pitch from the screw vane directly below S' to the screw vane at the feed start end. Each pitch between the screw vanes at the feed start end gradually increases from the feed start end toward the outlet opening. A screw feeder according to claim 1, which is characterized in that the screw feeder is characterized in that: 3. A utility model characterized in that an introduction space whose cross-sectional area gradually decreases in the cylindrical part from directly below the front end wall toward the outlet opening is provided above the screw blade at the intersection of the input hopper and the cylindrical part of the screw casing. A screw feeder according to registered claims 1 and 2.