JPS6371014A - Granule feeding method and feeder - Google Patents

Abstract

PURPOSE:To solve a clogging problem on screw loading as well as to make the quantitative feed of small or very small quantity performable, by conveying and feeding granules with a difference in conveying quantities by two screws different in diameter and in conveying direction each, and being set up concentrically. CONSTITUTION:A motor 6 is rotated, a support part 2 is rotated as well, thereby two spring screws 3 and 4 in reverse of each winding method and different in diameter are rotated. Under this state, granules P are charged from the charging port 1a of a casing 1, and these granules are conveyed in a white arrow direction by the spring screw 3, while they are conveyed in the black arrow reversible direction by the spring screw 4. In this case, if the spring screw 3 is made larger in diameter than the spring screw 4 and its pitch is properly designed, the conveying quantity by the spring screw 3 becomes larger, so that these granules are smoothly conveyed to the right as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a screw set powder supply method and a supply device suitable for supplying a small quantity of powder or granules.

(Prior Art) Conventionally, there has been known a feeding device that uses a screw to feed powder or granular material.

This type of complete screw feeder can be used in small quantities (e.g. 2 per hour).
In order to supply granular materials of 0.00 to several 100 g), it is possible to reduce the screw blade diameter and reduce the rotation speed.If the blade diameter is made smaller, the blade pitch also becomes smaller, which may cause the screw to become clogged. A bridge forms at the bottom of the hopper for feeding powder and granules, and the powder does not flow all the way to the screw, making it difficult to supply small quantities with excellent quantitative accuracy. Also, in order to reduce the volume while keeping the diameter of the screw large, a screw with a thicker screw shaft and shallow blades is sometimes used, but there is a limit to this, and if the screw is made too shallow, powder and granules will stick to the shaft. The so-called “
There is also the problem that the water becomes swollen and cannot be discharged.

Therefore, it is conceivable to use a powder supply device that uses a screw (called a spring screw) in which a linear spring is spirally wound in place of a set of screws. This type of screw set supply device does not have a shaft in the supply section, so even if the diameter of the screw is reduced, there is no problem like the above-mentioned screw set, but the supply amount is adjusted by adjusting the screw diameter and rotation speed. However, there is a limit as there is a small amount of supply, and it is difficult to supply it in small quantities.

(First Embodiment and Structure of the Invention) The present invention has been made in view of the above points, and an object of the present invention is to provide a supply method and a supply device suitable for supplying a small amount or a trace amount of powder or granular material. In order to achieve this, two concentrically arranged screws with different diameters are used, and the conveying direction of the powder and granular material by one screw and the conveying direction of the powder and granular material by the other screw are opposite to each other. Powder and granular materials are conveyed and supplied based on the difference in conveyance amount.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 shows an embodiment of the screw set powder supply device according to the present invention, in which 1 is a casing, 1a is a powder input section, and 1b is a powder discharge [1].

A stepped support part 2 is provided inside the casing l, and a large diameter spring screw 3 is installed in the large diameter part 2a.
One end 3a is attached, and one end 4a of a small diameter spring screw 4 is attached to the small diameter portion 2b.

What is important here is that the winding methods of spring screws 3 and 4 are reversed; for example, if spring screw 3 is right-handed, spring screw 4 is left-handed.

A stirring rod 5 is attached to the outer periphery of the stepped support section 2 for smooth discharge of powder and granular material from the hopper. The stepped support portion 2 is rotated by a motor 6 in the direction of the arrow.

Now, in the supply device configured as described above, the motor 6
When the support part 2 is rotated by rotating the spring screws 3 and 4, the spring screws 3 and 4 are also rotated. Then insert r-] 1 a
When the powder P is introduced, the powder is transported by the spring screw 3 in the direction of the self-arrow, or by the spring screw 4 in the opposite direction of the black arrow. If the diameter of the splinter screw 3 is larger than that of the spring screw 4 and the pitch is appropriately designed, the amount of conveyance by the spring screw 3 will be larger, and the powder and granules will be conveyed in the right direction as a whole.

Since the two screws are installed concentrically in this way, not only does the screw come out smoothly from the screw outlet, but the flow inside the casing is also smooth. Now, the diameter of the spring screw 3 is d7, the pitch is Pl, the diameter of the spring screw 4 is d2, and the pitch is P2. Support part 2
If the rotation speed of is n (rpm), the supply amount Q of 8 parts per minute is
becomes as follows.

Q = (d+”P 1-d 2”P 2)X n
Therefore, the diameter d+ of splinter screws 3 and 4,
d2 and pitch P1. By appropriately selecting P2 and the rotational speed of the motor 6, a small amount or fine amount of water can be supplied. That is, d,,d2. P.

Even if P2 is chosen to be large, the supply amount Q can be kept to the required small amount, so smooth supply and still a very small amount of II results in 11 and E.

FIG. 2 shows another embodiment of a powder supply device with a spring screw set based on the undeveloped 1!1, and the reference numbers in FIG. 1 and the turn in fa indicate the turn components.

In this embodiment, the spring screws 3 and 4 are driven independently by separate drive sources, and 7 is a support part that supports the spring screw 3, and 8 is a support part for the spring screw 4.
9 is the rotating shaft of the supporting part 7, 10 is the rotating shaft of the supporting part 8, 11 and 12 are gears, 13 is the supporting part 7
14 is a motor for rotating the support part 8.

Now, when the supporting parts 7 and 8 are rotated in the same direction, the powder P is fed to the right by the difference between the amount conveyed by the spring screw 3 and the amount conveyed by the spring screw 4, as in the first embodiment. Ru. When the rotational speeds of the support parts 7 and 8 are respectively n, (rpm) and n2 (rpm), 1
The supply amount Q per minute is as follows.

In this embodiment, if the rotational speeds of the motors 13 and 14 are changed independently, the supply amount Q can be varied over a wider range than in the first embodiment, and according to the inventors' experiments, the supply amount Q can be changed more widely than the first embodiment. The ratio to the maximum supply amount is about 1000 times.

Therefore, in this example, the amount of powder and granules from a very small amount to a large amount is rl.
It becomes possible to supply a wide variety of feeds using one feeder.

In this embodiment, the windings of the spring screws 3 and 4 are reversed so that the directions of rotation of both spring screws are the same, but the windings of both spring screws may be the same but the directions of rotation are reversed.

In addition, in the above embodiment, spring screws were used as both of the two different diameter screws, but the present invention is not limited to this. Among the two screws, a spring screw is used for the larger diameter outer screw, and a normal impeller is used for the smaller diameter inner screw. It may also be one using a shaped screw.

FIG. 3 shows an example of a supply experiment according to the first embodiment.

Using a casing with an inner diameter of 27 mm, an outer screw with a diameter of 20 mm and a pitch of 10 mm, and an inner screw with a diameter of 16 mm and a pitch of 15 mm, the rotation speed of the motor was set to 0 to 72 rpm for flour and metal silicon.
The results of measuring the supply amount when changing the amount are shown below. As can be seen from the figure, the rotational speed of the motor, and thus the rotational speed of the spring screw, and the supply amount are almost proportional.

(Effects of the Invention) As described in 1 above, in the present invention, two concentrically arranged screws of different diameters are used, and one screw transports the powder and the other screw transports the powder. The conveyance direction of the granules is set to be opposite to each other, and the granules are conveyed and supplied by the difference in the conveyance amount by both screws.
There is no need to reduce the diameter of the screw, and as a result, there is no clogging of the screw, no tunneling in the supply pipe, and no bridging in the hopper, making it possible to quantify small and minute quantities.
, Fj] supply becomes f7.

[Brief explanation of the drawing]

Fig. 1 is a mechanical diagram of one embodiment of the powder and granule supply device according to the present invention, Fig. 2 is a granule route diagram of another embodiment of the powder and granule supply device according to the present invention, and Fig. 3 is a diagram of the present invention. An example of a feeding experiment using the powder/granular material feeding device according to the invention will be shown.

Claims (5)

[Claims] (1) Two concentrically arranged screws with different diameters are used, and the conveying direction of the powder and granular material by one screw and the conveying direction of the powder and granular material by the other screw are mutually opposite directions, and the powder and granular material is transported by both screws. A method for supplying powder or granular material, characterized in that the powder or granular material is transported and supplied in a predetermined direction based on a difference in the amount of material transported. (2) One end of two screws of different diameters are concentrically fixed and supported on the same rotating support part, and both screws are wound so that the conveyance directions of the powder and granular material are opposite to each other. Powder supply device. (3) two different diameter screws arranged concentrically, a first rotational support part that fixedly supports one end of the large diameter screw, a second rotational support part that fixedly supports one end of the small diameter screw; and a drive means for driving the first and second rotary support parts so that the direction in which the powder or granular material is transported by the large-diameter screw and the direction in which the powder or granular material is transported by the small-diameter screw are opposite to each other. Features: Powder transport device. (4) The powder supply device according to claim 3, wherein the large-diameter screw and the small-diameter screw are wound in different directions, and the first and second rotational supports are rotated in the same direction. . (5) The powder supply device according to claim 3, wherein the large-diameter screw and the small-diameter screw are wound in the same direction, and the first and second rotational supports are rotated in opposite directions. .