JPS583939B2 - Quantitative feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quantitative feeding device that is interposed in a powder processing system and can be used for general purposes.

There are a wide variety of powder metering devices, as it is necessary to select a device that is suitable for each type depending on the physical properties such as particle size, specific gravity, or particle shape, or the amount of water contained. has been disclosed and put into practical use.

Those that mainly rely on gravity, such as table feeders, those that mechanically move the powder layer, such as screw feeders, those that rely on vibration or reciprocating motion, such as vibro feeders or plunger feeders, or those that rely on reciprocating motion, such as ejectors or air slide feeders. Various types of metering devices, such as those based on fluid pressure or fluidization, are typical.

However, due to the characteristics of the powder described above, it is extremely difficult to apply these products to all types of powder, and it is difficult to apply these products to all types of powder. As a result, a wide variety of measures had to be taken to keep the value constant.

The present invention was developed in consideration of the current situation, and even if there is a deviation in the true specific gravity, particle size, or particle shape of the powder, it can be stabilized by always maintaining the bulk specific gravity at the supply port in a substantially constant state. The purpose of the present invention is to provide a device capable of supplying a fixed amount.

For this purpose, a rotating cone is provided to rotate at a constant rotation speed in the powder storage section of the device so that the stored powder can be smoothly moved to the bottom. Lower your body to the vicinity of this rotating cone,
On the bottom plate, the powder is extruded in the circumferential direction of the storage part, and the discharge port is equipped with a receiving shelf, which allows the powder to maintain its angle of repose on the top surface and alleviates the pulsation during extrusion, resulting in constant extrusion. The purpose of the present invention is to provide a quantitative supply device that can discharge a certain amount of powder to the outside.

An example of an embodiment of the device of the present invention will be described in detail below based on the drawings.As shown in FIG. The upper part is configured as a powder storage section 1.

In the powder storage section 1 occupying the upper part of the device,
A receiving seat is provided as necessary along the inner part of the upper part, and a rotating cone is provided directly above the bottom plate 3, which is rotatable by inserting a sealing mechanism and connecting it to the rotational drive transmission part 2. 4, and in the lower half of this rotating cone 4, as shown in FIG. 1 or FIG. A blade 5 and a raking blade 6 positioned slightly above the blade and curved so as to advance in the direction of rotation at an angle are fixed in two stages,
An annular partition plate 7 is fixedly installed from the inner wall surface of the powder storage part between these lower extrusion blades 5 and upper raking blades 6, and between the inner green of this partition plate and the rotating cone. A similarly annular gap 4 of a constant width is created.

Then, the peripheral wall is cut and opened at an appropriate location, and the bottom plate is protruded out of the powder reservoir wall in this part to provide a protruding receiving shelf 9, and this part is used to form an opening at the tip of the receiving shelf 9. A damper 10 is provided at the base of the receiving shelf 9 to accommodate the properties and amount of powder discharged from this portion.

The powder in this device is supplied from the upper part of the powder storage section 1 by normal means, and the amount of stored powder is detected by, for example, an electrostatic leveler inserted through the nozzle 11, and the amount is adjusted as appropriate. Needless to say, the supply amount must be controlled.

Next, to describe the behavior of the powder during actual use of this first embodiment device, the powder fed into the powder storage section 1 is transported by the curved peripheral surface of the rotating cone 4 and the annular partition plate 7. It is held across an annular gap l.

When the rotary cone 4 is rotated one drive by an external drive source via the rotary drive transmission section 2, the powder is spread by the rotary cone and slides down along its curved surface, and the powder is stored. The powder distributed in the area extending from the inner surface of the circumferential wall of the portion 1 to the surface of the partition plate 7 is scraped up by the rotation of the scraping blade 6 in the rotational direction A, and transferred to the side of the rotating cone.

Powder that has slid down from the surface of the rotating cone and powder that has been scraped up is collected here and descends onto the bottom plate 3 through the annular gap l formed between the partition plate 7 and the rotating cone 4. It is.

The powder that has fallen onto the bottom plate 3 fills the space formed by the bottom plate 3 and the partition plate 7, and at the same time, the extrusion blade 5 whose tip is curved at a lag angle with respect to the rotation direction A is used to form a rotating cone. As the rotating cone rotates, the powder is pushed outward from the periphery of the base of the rotating cone and moves.

The powder thus energized in the outer circumferential direction is then pushed out onto the receiving shelf 9 through the notch opening at the lower edge of the peripheral wall, which has been adjusted to an appropriate height by adjusting the height of the damper, and the angle of repose is maintained on the receiving shelf. The amount exceeding this amount is quantitatively sent out from the outlet.

In the device of the present invention, which allows the powder to move smoothly and continuously, as in the above-mentioned embodiment, for example, the number of push-out blades in the lower stage is greater than the number of scraping blades in the upper stage. By increasing the amount of powder distributed on the partition plate, the amount of powder transferred onto the bottom plate is balanced with the amount of powder transferred onto the bottom plate that is led out of the device through the discharge port. It is an advantage of the device of the invention that the body transition is free from pulsations and that the bulk specific gravity is kept constant at all times.

In addition, in many conventional quantitative feeding devices, the storage pressure of the powder is directly applied to the moving flow line for discharging the powder, and this makes the metering feeding device This made it difficult to ensure quantitative discharge while making the structure complex, and at the same time made it difficult to use one type of device to universally handle powders in all states with different physical properties and components9.

In the device of the present invention, the curved slope of the rotating cone divides the load pressure caused by the height of the powder storage into a partial pressure and reduces it by dispersing it.Furthermore, the partition plate allows the load pressure caused by the height of the powder storage to be dispersed and reduced. Since the load of the distributed powder is supported by the sedimentation pressure, and the powder is not added to the part of the powder that is moved to the discharge port by the extrusion blade, it slides down along the curved slope of the rotating cone and reaches above the bottom plate from the annular gap l. It is possible to always maintain a constant bulk specific gravity of the powder that is transferred to the fixing material, and the fixing supply can be carried out efficiently.

The function of the partition plate in the apparatus of the present invention thus plays an important role in keeping the discharge amount constant regardless of the powder storage height (powder surface height).

Using the same type of powder under the same conditions, we verified the relative relationship between emissions and powder surface height with and without a partition plate, and the results are shown in the graph in Figure 3, in the case without a partition plate. In contrast, when a partition plate is provided as in the embodiment of the present invention, the amount of powder discharged increases as the height of the powder surface increases, a tendency that is often observed in conventional quantitative feeding devices. The metering rate was maintained at almost one beat, and it was clearly seen that the excellent function as a quantitative feeding device was abolished. Deviations in the angle of repose due to the properties of the powder can be dealt with mainly by the opening degree of the damper, and the amount of discharge can be dealt with mainly by the rotational speed of the rotating cone, that is, the scraping blades and the extruding blades. According to the spirit of the present invention, the apex angle of the rotating cone, the number or shape of each blade, or the shape of the discharge port are not limited to the above embodiments, and modifications or variations derived therefrom are not limited to the above embodiments. Needless to say, all applications and the like are included in the technical idea of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a device according to an embodiment of the present invention, FIG. 2 is a plan view from X2-X2 in FIG. 1, and FIG. 3 is a graph showing the results of verifying the function of the partition plate. . DESCRIPTION OF SYMBOLS 1... Powder storage part, 2... Rotation 1 drive transmission part, 3... Bottom plate, 4... Bullet cone, 5... ... Pushing blade, 6 ... Scraping blade, t ... Partition plate, 8 ... Discharge port,
9... Receiving shelf, 10... Damper, 11.
...Nozzle, A...Rotation direction, l...
...Annular gap.

Claims (1)

[Claims] 1. A rotary drive transmission section connected to a drive source is attached to the lower part of the powder storage section, and a rotating cone is connected directly to the rotation drive transmission section by inserting a sealing mechanism directly above the bottom plate in the powder storage section located at the upper part. The body is attached so that it can rotate in a certain direction, and the lower half of this rotating cone has an appropriate number of extruded blades whose tips are curved at a lag angle in the direction of rotation, and a suitable number of extruded blades slightly above the extruded blades. A suitable number of raking blades each curved so that the tips thereof advance in the direction of rotation are fixed to each other, and in the middle part of each of these blades fixed in two stages is a blade corresponding to the height of the blade. An annular partition plate is fixed to the inner wall of the powder storage part, and an annular gap of an appropriate width is provided between the innermost edge of the annular partition plate and the curved peripheral surface of the rotating cone to which each of the blades is fixed. On the other hand, at an appropriate location on the circumference of the bottom plate of the powder storage section, this low plate was protruded to the outside to create a part that served as a receiving shelf of a certain width, and this was used as a discharge port. A quantitative powder supply device characterized by