JP4439659B2 - Powdering method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a powder feeder that powders a necessary amount of powder stored in a storage chamber to the outside, and a method and a powder feeder capable of reducing the influence of powder pressure and enabling highly accurate powder feeding About.
[0002]
[Prior art]
Conventionally, a supply disk that rotates at the bottom of the storage room for the granular material is provided, and a required amount of the granular material flows into the storage space on the upper surface of the rotary body, and the supply disk is rotated and discharged outside the storage room. Powder machines are widely used.
The rotation path of the storage space of the supply panel was used with an open structure leaving the discharge part. However, the powder pressure in the storage chamber acts on the storage space for a long time, and the powder particles in the storage space are seen from above. The pressure was increased by the powder pressure, and the bulk density became high, or the flow was unstable because the powder particles from above were moved. In order to solve this problem, a structure has been developed in which a partition plate is provided above the feeding path of the storage space of the supply board, and an inflow port through which the granular material flows into the storage space below is opened. This granular material inlet has one opening and has a slightly wide opening area sufficient to fill the accommodating space with the granular material. However, the powder pressure in the storage chamber acts from this granular material inlet and is also pressurized by the powder pressure, increasing the bulk specific gravity and reducing the powder feeding accuracy. In detail,
In a single-shaft powder metering machine equipped with a powder supply plate that rotates concentrically with the center of the storage chamber, the powder pressure applied to the blades of the supply plate is equal to the powder surface height of the storage chamber. For the phenomenon in which the bulk density of the powder filled in the blades fluctuates due to fluctuations, the influence of charge impact on the storage chamber, and the fluctuation of powder pressure due to the influence of aeration and vibrator to prevent bridge phenomenon and rathole phenomenon In conventional quantitative feeders, the diaphragm sport method and the cylindrical / cones sport method are widely used as measures for preventing fluctuations in powder pressure in the blades, but each method has the following drawbacks.
(1) Disadvantages of the diaphragm system Since the cylinder diameter and the entrance diameter of the main body can be made the same diameter, the device is more compact than the sport system, and when this machine is used in a small storage chamber, The height of the powder surface on the supply board can be made constant, but depending on the powder, the position of the opening of the partition plate is in the center, so even if the upper stirring body is stirred on the partition plate, the opening Since the powder outside the portion hardly moves to the center, a rat hole corresponding to the opening diameter is easily formed on the hopper side. In addition, when the upper storage chamber is large, the powder pressure on the supply panel is likely to fluctuate even if a partition plate is equipped due to the influence of aeration and a vibrator for preventing bridges and ratholes.
Air for air transportation of the empty mass discharge part is brought into the space between the supply panel and the partition plate, the air pressure in the upper space rises and pressurizes all powder surfaces on the supply panel, so When the air pressure varies, the filling bulk density of the powder varies.
(2) Cylinder / conesport type defects In the case of a cylinder, the diameter of the sport is the entrance diameter of the metering feeder, and the required minimum diameter is determined by factors such as the physical properties and supply capacity of the powder. The diameter of the cylinder is higher than that in the case where no sport is used, so the diameter of the main body becomes one size larger and the cost becomes higher.
In the case of Cornsport Cone Sport, there is a method that uses an inverted conical sport with a lower end diameter smaller than the entrance diameter of the sport and makes the cylindrical diameter of the meter feeder and the sport entrance diameter the same. In the case of a powder, when the powder has a low bulk density and a high compression ratio (such as pulverized waste plastic, fluff, molten fly ash, etc.), bridging is likely to occur in the sport part.
The sport method has a great effect on reducing the powder pressure on the rotating body, but it is a method that scrapes the powder horizontally in the transport space of the outer periphery of the main body cylinder from the gap between the sport and the bottom plate with a stirring blade. With no sport system, the powder surface height in the transport space fluctuates due to fluctuations in powder pressure, so high quantitative performance cannot be obtained.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a powder feeding method and apparatus that eliminates these conventional problems, reduces the influence of powder pressure, and enables highly accurate powder feeding.
[0004]
[Means for Solving the Problems]
The configuration of the present invention that solves this problem is as follows.
1) A feed board in which a storage space in which the powder particles in the storage chamber are flowed down from the upper opening and accommodated in an annular shape is rotatably installed at the bottom of the storage chamber in which the powder particles are stored, and the transfer path of the storage space In the middle of the storage space, a discharge part for discharging the granular material in the storage space to the outside of the storage chamber is provided, and a partition plate for closing the upper part of the storage space except the granular material outlet is provided, and the granular material in the storage space In the powder feeding method, the powder is flowed down from the lower part of the granular material flow into the storage space of the lower supply panel, and the granular material is discharged at the discharge part.
A plurality formed between the accommodation space is projected in the radial direction to the feed plate outer peripheral vanes, it provided the diaphragm directly above the blade, provided with separately granular material falling port at a plurality of locations, granular material stream of diaphragm The opening area of the mouth is increased from the discharge part around the direction of forwarding, and the powder flow from the discharge part is accommodated by reducing the first drop of the powder that flows down after discharge from the discharge part. Powder supply method characterized by reducing the influence of powder pressure by ensuring that the entire amount is filled at the outlet of the granular material to be flown down last so that it does not enter the entire space 2) Powder to be flowed down first The powder feeding method according to 1) above, wherein the granular material from the lower outlet of the granular material is accommodated only in 70% or less of the capacity of the accommodating space. 3) Powder in the storage chamber at the bottom of the storage chamber storing the granular material An accommodation space for accommodating particles by flowing down from the upper opening is formed in an annular shape. The formed supply board is rotatably installed, and a discharge unit is provided in the middle of the transfer path of the storage space to discharge the powder in the storage space to the outside of the storage chamber. A partition plate that is closed except for the mouth is provided, and a plurality of granular material flow-down ports are provided in the partition plate, and a plurality of storage spaces are formed between the blades that protrude radially from the outer periphery of the supply plate. It is provided directly above, and the opening area of the granule flow outlet of the partition plate is increased from the discharge part around the feeding direction. Powder supply device 4 that reduces the influence of powder pressure by ensuring that the entire amount of the storage space is not filled with the granular material from the granular material flow outlet, and that the entire amount is surely filled at the granular material flow outlet to be finally flowed down. The granular material from the granular material flowing down first is 70 of the capacity of the accommodation space. It said to reduce the area of the granular material falling port so as not to be accommodated only below 3) in the powder feeding apparatus <br/> according.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The partition plate of the present invention closes the upper part of the feeding path of the accommodation space of the supply board, and is usually ring-shaped or disk-shaped. In addition, there are a plurality of powder outlets on the partition plate, but the area of the powder outlet to be flowed down first is small so that the entire accommodation space is not filled with powder, and three powders At the flow outlet, about 40 to 60% is filled at the first granule flow outlet, and the remaining powder flow is filled at all, and the final flow at the final flow is ensured. It is preferable to make it fill, so that the area of the flow-down port should be increased along the direction of feeding. In addition, it is preferable that the outlet of the granular material flowed down last is closer to the discharge portion because the influence of the powder pressure can be reduced.
As the structure type of the supply board, blades are provided radially on the outer periphery, the required amount of powder is accommodated between the blades, and the discharge part is discharged downward or upward by its own weight or air flow, or an annular groove on the outer periphery Or the structure type which provides a shelf and forcibly discharges it with the scraper provided in the discharge part is a typical example.
[0006]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a plurality of blades project radially from the ring, and a plurality of storage spaces for storing a predetermined amount of powder particles are provided in a space surrounded by the blades and the lower side surface and bottom surface of the storage chamber. A supply board formed of a blade and a blade is rotated through an arm by a rotation shaft provided at the center of the storage chamber, and a ring-shaped partition plate is fixed directly above the blade from the storage chamber outer wall side. This is an example in which the granular material flow outlets are provided at four locations on the partition plate and the opening area is gradually increased along the rotation direction. The filling rate by the first granular material lowering port is about 30 to 40%.
FIG. 1 is a longitudinal sectional view of the embodiment.
FIG. 2 is a plan view of the embodiment.
FIG. 3 is an enlarged plan view showing the partition plate of the embodiment.
FIG. 4 is a diagram showing the relationship between the supply amount of the example and the remaining amount of powder in the storage chamber.
FIG. 5 is a diagram showing the relationship between the supply amount and the remaining amount of powder in the storage chamber in the case of the partition plate having only the discharge part.
[0007]
In the figure, K is a powdering device of the embodiment, 1 is a storage chamber, 1a is a bottom surface of the storage chamber 1, 1b is a side surface of the storage chamber 1, 2 is a supply panel, 2a is a ring of the supply panel, and 2b is the same ring. 2c is a housing space surrounded by the blade and the bottom surface 1a and side surface 1b of the storage chamber 1, 2d is an arm for connecting the ring 2a to the rotary shaft 3, and 3 is a rotation. A shaft, 4 is a discharge portion, 4a is a discharge port opened in the bottom surface 1a of the discharge portion 4, 4b is a discharge chute, 5 is a partition plate attached to the side surface 1b of the storage chamber 1 directly above the blade 2b, 5a, Reference numerals 5b, 5c, 5d denote powder particle flow openings to the particle space 2c provided in the partition plate 5, 6 denotes a driving unit using a motor that rotates the rotating shaft 3, and P denotes calcium carbonate particles. Is the body.
[0008]
In this embodiment, calcium carbonate is stored in the storage chamber 1 as the granular material P, and the drive unit 6 is operated to rotate the supply board 2. The granular material P in the storage chamber 1 is placed on the partition plate 5 and the circular bottom surface 1a at the center, falls downward from the four granular material flow outlets 5a to 5d of the partition plate 5, and rotates downward. It flows into the storage space 2c of the supply board 2 that is being operated. As the supply board 2 rotates, the powder particles in the storage chamber 1 are stirred by the arm 2d.
The granular material flow lower ports 5a to 5d have the smallest area of the first granular material flow lower port 5a, and the amount of the granular material filled into the accommodation space 2c by this granular material flow lower port 5a is about 30 to 40%. Yes, the area of the next downflow port 5b is slightly large, and the filling ratio is about 60 to 80%, the next downflow port 5c is opened fairly widely, and the filling rate is about 85 to 95%. The flow-down port 5d is the widest opening and is filled to 100% or more, and is lightly subjected to powder pressure, but close to the discharge part 4, so it reaches the discharge part 4 before being pressed strongly by receiving powder pressure, and the same discharge In the part 4, it discharges | emits below from the discharge port 4a of the bottom face 1a.
Although the granular material P flows into the accommodating space 2c of the supply board 2 in four times, there is a space in which the accommodating space 2c is not filled in the first and second granular material flow outlets 5a and 5b, It is easy to exhaust the air accompanying the filling, and the filled powder P is not pressurized. And although it fills in the accommodation space 2d near the 3rd granular material flow lower opening 5c, pressurization is not acted strongly. Then, it is completely filled in the fourth granular material flow lower port 5d and is in a slightly pressurized state, but since the time to the discharge unit 4 is short, there is almost no influence by the pressurization, and the discharge is performed downward from the discharge unit 4.
It is set as the structure which removed the partition plates 5 other than the discharge part 4, and open | released the effect | action of the granular material flow lower openings 5a-5d and the partition plate 5 of a present Example, and the amount of the granular materials in the storage chamber 1 of the same quantity, Example Fig. 4 shows the result of measuring the supply amount in the case of rotating at the same granular material, the same supply disk rotation speed of 9 rpm, and the case of this example in relation to the amount of granular material (remaining amount) in the storage chamber. , 5.
As can be seen from FIG. 5, when the partition plate 5 is removed, if the remaining amount of powder in the storage chamber is large, the supply amount is high and the supply amount decreases and fluctuates as the remaining amount decreases. It can be seen that the remaining amount acts as a powder pressure, and the granular material in the accommodation space 4 is pressurized and in a compacted state.
On the other hand, in this embodiment, as shown in FIG. 4, a substantially constant supply amount can be obtained until the remaining amount is greatly reduced. That is, it can be seen that there is no influence of the remaining amount (powder body pressure in the storage chamber). In addition, the fall of supply amount when the remaining amount reduces remarkably can be eliminated by replenishing a granular material to a storage chamber before the remaining amount falls greatly and a supply amount changes.
[0009]
【The invention's effect】
As described above, according to the present invention, by providing a plurality of flow-down openings in the partition plate so as not to be filled completely from the beginning, the powder pressure in the reservoir and its change (powder in the reservoir) The effect of the supply amount due to changes in body weight can be largely blocked, and more accurate powder feeding can be achieved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment.
FIG. 2 is a plan view of the embodiment.
FIG. 3 is an enlarged plan view showing a partition plate according to an embodiment.
FIG. 4 is a diagram showing the relationship between the supply amount of the example and the remaining amount of powder in the storage chamber.
FIG. 5 is a diagram showing the relationship between the supply amount and the remaining amount of powder in the storage chamber in the case of a partition plate with only a discharge part.
[Explanation of symbols]
K powder supply device P granular material 1 storage chamber 1a bottom surface 1b side surface 2 supply board 2a ring 2b blade 2c accommodation space 2d arm 3 rotary shaft 4 discharge part 4a discharge port 4b discharge chute 5 partition plates 5a, 5b, 5c, 5d Mouth 6 Drive unit

Claims (4)

At the bottom of the storage chamber for storing the powder particles, a feeding board in which a storage space for storing the powder particles in the storage chamber by flowing down from the upper opening is annularly rotated, and the transfer space of the storage space is on the way Provided with a discharge part that discharges the granular material in the storage space to the outside of the storage room, and provided with a partition that closes the upper part of the feeding path of the storage space except for the powder flow outlet, to powder the granular material in the storage room In the powder supply method of flowing and filling from the lower part of the granular material flow into the storage space of the lower supply board, and discharging the granular material at the discharge part,
A plurality formed between the accommodation space is projected in the radial direction to the feed plate outer peripheral vanes, it provided the diaphragm directly above the blade, provided with separately granular material falling port at a plurality of locations, granular material stream of diaphragm The opening area of the mouth is increased from the discharge part around the direction of forwarding, and the powder flow from the discharge part is accommodated by reducing the first drop of the powder that flows down after discharge from the discharge part. A powder feeding method characterized by reducing the influence of powder pressure by ensuring that the entire amount is filled at the outlet of the granular material flowing down so as not to enter the entire space and finally flowing down .   2. The powder feeding method according to claim 1, wherein the granular material from the granular material flow-down port that is allowed to flow first is accommodated only in 70% or less of the capacity of the accommodating space. At the bottom of the storage chamber for storing the powder particles, a feeding board in which a storage space for storing the powder particles in the storage chamber by flowing down from the upper opening is annularly rotated, and the transfer space of the storage space is on the way Provided with a discharge part for discharging the granular material in the storage space to the outside of the storage chamber, a partition plate for closing the upper part of the conveying path of the storage space except for the granular material flow outlet, and separating the granular material flow outlet at the same interval A plurality of storage spaces are formed between the blades projecting radially on the outer periphery of the supply board, a partition plate is provided immediately above the blades, and an opening area of the granule flow outlet of the partition plate from the discharge portion Increase the size around the feeding direction, and reduce the size of the powder flow outlet that flows down first after discharge at the discharge section so that the entire amount of powder is not contained in the storage space. The powder pressure is reduced by ensuring that the entire amount is filled at the final outlet of the granular material. Powder feeding device to reduce the sound. 4. The powder feeding apparatus according to claim 3, wherein the area of the granular material flow outlet is made small so that the granular material from the granular material flowing down first is accommodated only in 70% or less of the capacity of the accommodation space.

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