JP3360003B2 - Powder inlet for powder flow tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for storing powder material,
Further, the present invention relates to a powder flow tank which is fluidized in a closed state in order to supply the powder to a necessary department accurately, and particularly to a powder inlet which is opened when refilling and supplying powder as a material into the tank.

[0002]

2. Description of the Related Art Numerous types of methods for utilizing pneumatic force for transporting powder and apparatuses for implementing the method have already been proposed and put to practical use. It is natural that the range of use of powder will expand dramatically with the results of research, and the most appropriate means of transport for the nature and quality of the powder will be adopted, but as a conventional concept of powder transport, A method of injecting high-pressure air into a powder transport ejector mounted at an appropriate position in the powder storage tank to transport a large amount of powder, and a method of blowing high-pressure air evenly over almost the entire surface in a closed tank, The method of discharging the body and air in a flowing state when necessary is understood as a main classification, and a number of conventional techniques have been proposed which extend their advantages and correct their disadvantages, respectively.

An object of the present invention is to improve the powder inlet of a powder flowing tank according to the fluidizing method.
Specifically, the target is a powder flowing tank whose typical structure is schematically shown in FIG. That is, the closed tank 10
Numeral 1 is vertically separated by a horizontal perforated plate 106, an upper part is a powder flowing chamber 105, and a lower part is a fluidizing air chamber 107. A powder discharge port 108 is provided below the powder flow chamber 105 and immediately above the perforated plate 106, and discharges the powder in the closed tank at a desired timing by opening and closing the discharge valve 109. On the other hand, in the fluidizing air chamber 107 below the perforated plate, an air pipe 110 for supplying compressed air for fluidizing is provided with the on-off valve 1.
11 to supply high-pressure air necessary for fluidization to the fluidizing air chamber, and upwardly fluidize with substantially uniform air pressure almost entirely from the injection holes 112 that are regularly drilled in the perforated plate 106. Since the fluid is blown up into the fluidizing air chamber, a fluidized bed is uniformly formed in the fluidizing air chamber, and many powders induce a fluidizing motion such that the liquid boils together with the air.

Normally, the operation proceeds smoothly in this manner, and uniform fluidization and powder discharge are performed at a desired time. However, as the amount of powder remaining in the closed tank gradually decreases, the fluidization proceeds. Since the state of the fluidization changes and the steady-state fluidization must be maintained, it is necessary to replenish the consumed tank powder to the closed tank 101 during the fluidization movement. As shown in FIG. 2, in the form of a normal powder flowing tank, the powder inlet 102 is provided on the upper surface of the closed tank, and the upper lid 123 is placed during the operation to keep the sealed state. The powder is charged from the section and the powder in the powder flow chamber is replenished to return to a steady state.

[0005]

When powder is charged into the closed tank 101 from the powder inlet 102 with the upper lid removed, a large amount of powder vertically falls freely with acceleration. Therefore, it is not an environment in which the work can be performed as it is because the dust is gathered and the dust is intensively blown out from the powder inlet, which is the only opening of the sealed space. For this purpose, a dust-absorbing duct 104 is usually attached to the top surface of the closed tank separately from the powder inlet 102, and a pipe is connected to the dust collector whose end is not shown. By sucking and discharging the dust, we are working to ensure a work environment where we can work.

However, such a configuration makes it difficult to effectively discharge and collect dust, and in order to effectively enhance dust removal,
It is necessary to increase the capacity of the dust collector more than necessary, and in the steady state with the cover surface covered, the difference between the internal pressure and the external pressure of the closed tank becomes too large to make the upper lid difficult to open, and sometimes the closed tank There is a possibility that bad conditions such as deformation of the powder itself and instability of the powder discharging operation may be induced.

FIGS. 3 (A), 3 (B) and 3 (C) show a prior art (actual) proposed to solve the problem of scattering when transferring powder from a powder flowing tank to another powder flowing tank. No. 58-11785). FIG. 1A illustrates the entire configuration, FIG. 1B shows a prior art prior to showing the problems in the present prior art, and FIG. 1C shows an embodiment of the cited example. The content of this technology is
The powder is taken out from one powder flow tank 201 and transferred while fluidizing a gentle-slope pressure chute 202 to reach the end, from the vertical tube 203 to another powder flow tank 204.
In the basic configuration in which the powder is dropped and transferred, a large amount of accompanying air drops together with the powder due to the high falling speed in the vertical pipe as shown in FIG. When the top surface of the tank is open, the scattering of dust is enormous, and in a steady fluidized state with the top surface closed, the internal pressure of the tank becomes excessive and the load on the filter of the dust collector 206 becomes remarkable. Leakage from gaps in the area is considered an issue.

In this prior art, in order to solve this problem, as shown in FIG. 1C, a reflux pipe 205 communicating vertically with the vertical pipe 203 is provided in parallel, and air accompanying powder is used for powder flow. It is said that the tank was returned from the tank and circulated again so as to become the accompanying air, and the effects of increasing the internal pressure of the tank and preventing dust scattering were obtained. However, there remains a question whether the function shown in FIG.
Fluid (air) that contains suspended powder in a rich state as the powder is supplied
However, there is a concern that this may partially cause the powder to flow backward in the direction of the powder inlet and reduce the conveying action.

According to the present invention, in order to solve the above-mentioned problems, even when the upper lid is opened for replenishing and supplying powder, the powder falling into the closed tank at the time of charging rises and a large amount of dust is blown out. It is an object of the present invention to provide a new powder inlet for a powder flowing tank which can prevent the occurrence of a problem and facilitate the smooth material supply without deteriorating the work environment.

[0010]

According to the present invention, a powder inlet 2 of a powder flowing tank according to the present invention has a lid surface 21 which protrudes from the top surface 11 of the closed tank 1 and on which an upper lid 23 is detachably mounted. It is formed of a cylindrical body having a bottom surface 22 protruding to the inside of the tank 1, and a vertex 31 is fixed at a position lower than the lid surface 21. A cone 3 having a conical surface 32 forming an inclined space E and having a conical bottom surface 33 positioned lower than the bottom surface 22 is provided concentrically with the cylindrical axis of the powder inlet 2, and a lid surface of the closed tank 1. 21 to seal the outer periphery of the powder inlet 2
And the other end 42 is connected to the inside of
The powder P flows into the tank while increasing the flow velocity in the oblique space E.
Dust collector 6
The configuration is characterized in that a dust-absorbing duct 4 is provided so as to open and close freely .

When powder is supplied into a closed tank,
The upper lid 23 covered on the lid surface 21 of the powder inlet 2 is removed and opened, and the powder is charged from the opened lid surface. The charged powder passes through the inclined space E (diffuser) between the inner peripheral surface of the cylinder of the powder inlet and the conical surface 32 of the cone 3 and is charged into the tank. At this time, of course, a large amount of powder soars,
Since the inside of the closed tank is always reduced in pressure from the atmospheric pressure by the action of the dust collector 6 connected to the end via the dust absorbing duct 4, the air velocity increases due to the inclined space shape of the lower constriction. While flowing from the powder inlet 2 into the closed tank, the function of preventing the soaring powder from flowing out of the powder inlet to the outside appears. That is, the dust absorbing duct 4
One end 41 of the tank is above the top surface 11 of the closed tank 1.
So that it rises up in the tank
Effectively captures and sucks only dust. And the one
The end 41 is, of course, from the bottom surface 22 of the powder inlet 2.
Since it is on the upper level, this cylindrical body serves as a partition wall and the inclined space E
The inflow of the powder P in the inside proceeds, and the entrained air speeds up
Effectively promote powder supply
You.

When discharging powder from a closed tank,
By closing or narrowing down the communication with the outside of the dust absorbing duct, the internal pressure of the closed tank is temporarily increased to smoothly discharge the powder. Also, when the upper lid 23 covering the lid surface is removed, if the communication with the outside (the dust collector) of the dust-absorbing duct is primarily cut off or narrowed down, the internal pressure increases, so that the removal can be easily performed. In this case, the upper lid is removed and the lid surface 21 is removed.
As described above, the dust suction duct is opened at the same time that the dust is opened to suck and prevent the dust from rising.

[0013]

1 (A) and 1 (B) are one embodiment of the present invention, and are partial front views mainly showing the vicinity of a powder inlet and a dust absorbing duct. The other structures are basically the same as the front view of the prior art shown in FIG. 2, and the powder stored and flowing in the perforated plate, the flowing air chamber, and the closed tank 1 not shown in FIG. And an air pipe for supplying high-pressure air into the air chamber for flow are omitted.

In FIG. 1A, a closed tank 1 is formed of a box having a substantially rectangular cross section made of a steel welded structure.
The upper part shown in the figure is the powder flow chamber 5. Closed tank 1
A powder input port 2 made of a cylindrical body is erected at substantially the center of the top surface 11 of the container, and the lid surface 21 is fixed at a higher position than the top surface 11.
The bottom surface 22 is at a low level protruding into the closed tank. The cone 3 is fixed in a state of being enclosed and enclosed by the cylindrical body, and the vertex 31 is higher than the top surface 11 but slightly lower than the lid surface 21. The diameter of the conical surface 32 of the cone is increased downward, and the distance between the conical surface 32 and the inner peripheral surface 24 of the powder inlet is gradually narrowed. An inclined space E that holds a space that is sufficiently effective for supply is formed.

An annular dust-absorbing duct 4 is wound on the top surface 11 of the closed tank 1 so as to surround the outer peripheral surface of the powder inlet 2, and one end 41 of the dust-absorbing duct penetrates the top surface 11. And the other end is connected to the dust collector 6 via a throttle valve 43. Therefore, when the upper lid 23 is removed and the powder inlet 2 is opened as shown in FIG. 1, the air entrained with the powder once is guided by the negative pressure from one end 41 even if it enters the closed tank. Other end 42
The dust that has flown to the side and flows along with the powder supply also flows toward the dust collector 6 through the throttle valve 43 in the open state. The direction of the flow of the air or the powder is indicated by arrows in FIG.

Although it depends on the use of the powder, the range of use of the powder is expanded and the number of applications where the powder is used as a functional material or in place of another liquid material is increasing. There are cases where even more stringent requirements are required than before. For example, the technical value occupied by powders will continue to increase in the future, as powder coatings are mainly used in place of conventional liquid anticorrosive paints. For that reason, powder flow tanks have attracted attention in the industry.In contrast to conventional powder transport, which is based on the principle that a large amount of powder is mixed and transported quickly with airflow, the powder flow tank is Then, fluidize the powder under certain conditions,
For example, extra-fine powders that have an adverse effect on quality, such as ultrafine powders, can be separated from flowing powders, discharged through a dust-suction duct, and collected by a dust collector. Then, the significance of the present invention is further utilized.

[0017]

As described above, the present invention solves a major problem of a powder flowing tank which has been receiving attention in recent years. In addition, there is an effect that the intense dust that rises when supplying new powder to replenish the consumption is prevented from flowing out to the outside, and a comfortable work environment is maintained. In addition, opening and closing of the dust suction duct leading to the dust collector does not require complicated work that is particularly burdensome, and operates at a proper negative pressure and operates steadily. In addition, there is an advantage that a function for both maintenance and quality improvement can be obtained, such as preventing dust and more positively controlling the particle size of the powder.

[Brief description of the drawings]

FIG. 1 is a partial vertical front view (A) of a main part of an embodiment of the present invention, and a partial vertical front view (B) particularly showing the flow of air clearly by arrows.

FIG. 2 is a vertical sectional front view showing the entire prior art.

FIG. 3 is an overall view (A) of another prior art, a partial longitudinal front view (B) showing a problem, and a partial vertical front view (C) showing a means for solving the problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed tank 2 Powder inlet 3 Cone 4 Suction duct 5 Powder flow chamber 6 Dust collector 11 Top surface 21 Cover surface 22 Bottom surface 23 Top cover 24 Inner peripheral surface 25 Outer peripheral surface 31 Apex 32 Conical surface 33 Conical bottom 41 One end 42 Others End 43 Pressure regulating valve E Inclined space

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshisada Michiura 1-12-19 Kitahorie, Nishi-ku, Osaka-shi, Osaka Inside Kurimoto Ironworks Co., Ltd. No. 27 In Cotem Co., Ltd. (72) Inventor Kunya Konomori 3-4-2, Ishibashi, Ikeda-shi, Osaka (56) Reference Co., Ltd. JP-A-56-43130 (JP, A) 113369 (JP, A) JP-A-7-330080 (JP, A) JP-A-5-54531 (JP, U) JP-A-54-18881 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 90/00 B65G 53/36 B65G 69/18

Claims (1)

(57) [Claims] 1. A powder supply port for supplying and supplying powder P, which is opened at the top surface of a powder flow tank for storing, fluidizing and supplying the powder P. A lid surface 21 protruding from the surface 11 and detachably mounting the upper lid 23,
It is formed of a cylindrical body having a bottom surface 22 protruding to the inside of the closed tank 1, a vertex 31 is fixed at a position lower than the lid surface 21, and a lower constriction is formed between the powder container 2 and the inner peripheral surface 24. And a cone 3 having a conical bottom surface 33 located below the bottom surface 22 is provided concentrically with the cylindrical axis of the powder inlet 2. It surrounds the outer peripheral surface 25 of the powder inlet 2 on the top surface 11
One end 41 communicating with the inside of the closed tank 1 is provided,
While increasing the flow velocity in the inclined space E, the powder P
A collection that draws the dust that has flown in
A powder inlet for a powder flowing tank, wherein a powder suction duct 4 is provided so as to be openable and closable with a dust machine 6 .