JPH061341U - Air flow transport pipe for powder - Google Patents

Abstract

(57) [Summary] [Purpose] To achieve efficient transportation of powder at low cost. [Structure] An injection pipe 14 for metal powder 12 is vertically connected to an upper side of a horizontally arranged transportation pipe 10. A blower is connected to the downstream side of the connection portion of the input pipe 14 in the transportation pipe 10. A partition plate 16 that divides the interior into upper and lower parts is arranged in the transportation pipe 10 in a horizontal state that intersects the direction of gravity. Then, on the downstream side of the connection portion of the charging pipe 14, the transportation paths 18a, 18 are vertically arranged with the partition plate 16 interposed therebetween.
b is defined. The upstream end of the partition plate 16 extends directly below the charging pipe 14 from the downstream end thereof to substantially the center inside. Therefore, from the input pipe 14 to the transport pipe 1
The metal powder 12 charged into the 0 is the two transportation paths 18a,
18b are evenly separated and supplied to the respective transportation routes 18a, 18b.
It is transported downstream along with air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a powder air flow transportation pipe, and more specifically, by arranging a partition plate horizontally inside the transportation pipe so as to intersect with the gravity direction, the powder is allowed to flow to the bottom of the pipe under the action of gravity. The present invention relates to a transport pipe which is capable of improving transport capacity by preventing excessive uneven distribution.

[0002]

[Prior art]

 As a means for transporting powder such as grains, cement and metal powder, an air conveyor is known in which air is caused to flow at a high speed inside a transportation pipe and the powder is transported by the air. As this air conveyor, a compressor is connected to the upstream side of the powder supply unit in the transportation pipe, and the air compressed by the compressor is supplied into the transportation pipe to supply the powder supplied from the supply unit into the pipe. There are those that pump the body to the downstream side, and those that suck and transfer the powder supplied from the supply section into the pipe by sucking air with a blower connected to the downstream side of the powder supply section.

Here, when the feeding force by the feeding means such as the compressor or the blower is constant, the flow rate of the air is reduced by decreasing the diameter of the pipe, and the transport amount of the powder is reduced, and if it is increased. The flow velocity of the air decreases and the powder is deposited in the pipe without being carried. Therefore, in order to efficiently use the feeding means, the pipe diameter of the transportation pipe is to reduce the pressure loss of the air flow in the pipe, and to improve the physical properties (density, particle size) of the powder to be transported and It is designed considering the amount of transportation per unit time.

[0004]

[Problems to be solved by the device]

 The powder that is transported in the transportation pipe together with the air is not transported in a state where the powder is uniformly dispersed in the vertical section in the portion where the pipe extends horizontally. That is, in the horizontally extending part of the pipe, the powder is transported in a state of being unevenly distributed on the inner bottom of the pipe due to gravity. The density concentration caused by uneven distribution of the powder becomes more remarkable as the density and particle size of the powder increase.

As described above, even in the case of the transportation pipe in which the feeding means is set to the diameter of the pipe that can be used efficiently, the density concentration of the powder at the inner bottom portion of the pipe occurs due to gravity, and if this exceeds the limit. The powder is deposited inside the pipe and cannot be transported. In this case, by reducing the pipe diameter to reduce the amount of transportation, it is possible to suppress density concentration within the limit and cope with it, and to make the feeding means such as the compressor and blower a high-output, large-capacity type. Is better resolved. However, in the case of the former, the transport efficiency decreases as the amount of powder transported decreases, and the pipe diameter set for efficient use of the feeding means is reduced. There is a problem that efficient use of the feeding means cannot be achieved. In the latter case, it is pointed out that the size of the device becomes large and the equipment cost increases.

[0006]

[The purpose of the device]

 This invention has been proposed in order to solve the above-mentioned problems inherent in the above-mentioned powder transport pipe, and to achieve efficient powder transport at low cost. It is intended to provide a transportation pipe to be obtained.

[0007]

[Means for Solving the Problems]

 In order to overcome the above-mentioned problems and preferably achieve the intended purpose, the present invention arranges at least one partition plate inside a pipe for transporting powder by air flow, and the partition plate is a gravity plate. It is characterized in that it extends horizontally in a direction intersecting with the direction of action, and defines a plurality of powder transport paths inside the pipe in a vertical relationship.

[0008]

【Example】

 Next, a powder air flow transportation pipe according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. In the examples, metal powder will be described as an example of the powder.

FIG. 1 is a vertical cross-sectional side view of a main part of an air flow transportation pipe according to a first embodiment of the present invention, in which a metal powder 12 is provided above a horizontally arranged cylindrical transportation pipe 10. The input pipe 14 is vertically connected. An upstream side of the connection portion of the feeding pipe 14 in the transportation pipe 10 is open to the atmosphere, and a blower (not shown) as an air suction source is connected to an appropriate position on the downstream side. By driving the blower, the air sucked from the opening flows at a high speed from the left side to the right side of the transportation pipe 10 in FIG. 1, and the metal powder 12 charged from the charging pipe 14 is the air. It will be transported to the right along with it.

As shown in FIG. 2, a partition plate 16 that divides the inside of the transportation pipe 10 into upper and lower parts is arranged inside the transportation pipe 10 in a horizontal state intersecting the direction of gravity. There is. Further, the partition plate 16 is arranged on the downstream side of the connection portion of the charging pipe 14 in parallel with the extending direction of the transport pipe 10, and defines the transport paths 18a and 18b above and below the partition plate 16 therebetween. is doing. Further, as shown in FIG. 1, the upstream end of the partition plate 16 extends from the downstream end of the charging pipe 14 to almost the center of the inside immediately below the charging pipe 14. As a result, the metal powder 12 vertically charged from the charging pipe 14 toward the transportation pipe 10 is supplied to the upper transportation path 18a defined by the partition plate 16 and the lower transportation path 18b. Is evenly separated from that supplied to. Then, these metal powders 12 are transported to the downstream side together with air in the transportation paths 18a and 18b.

The position of the upstream end of the partition plate 16 with respect to the input pipe 14 is appropriately adjusted according to the inner diameter of the transport pipe 10, the flow velocity of air, and the like, and the position of the predetermined amount dropped from the input pipe 14 is supplied. The metal powder 12 is set so as to be evenly separated into the upper and lower transportation paths 18a and 18b.

[0012]

[Operation of First Embodiment] Next, the operation of the airflow transportation pipe according to the first embodiment will be described. While the blower connected to the transportation pipe 10 is operating, a predetermined amount of metal powder 12 is dropped and supplied from the charging pipe 14. At this time, the metal powder 12 falls in a state of being dispersed in the entire inside of the charging pipe 14, and the metal powder 12 dropping at a position of the downstream side approximately half thereof falls on the upper surface of the partition plate 16 as shown in FIG. Then, the vehicle enters the transportation path 18a. Further, the metal powder 12 dropping at the position of the upstream half of the charging pipe 14 falls to the bottom of the transportation pipe 10 without being blocked by the partition plate 16 and enters the transportation path 18b. The metal powder 12 dropped and supplied from the charging pipe 14 by this is separated by the partition plate 16 and is evenly supplied to the transportation paths 18a and 18b.

The metal powder 12 supplied to each of the transportation paths 18a and 18b is transported to the downstream side by the air flowing in the pipe. At this time, as shown in FIG. 2, the metal powder 12 in the transport path 18a is transported in a state in which density is concentrated on the upper surface of the partition plate 16 under the action of gravity, and the metal powder 12 in the transport path 18b is transported. Under the influence of gravity, the transportation pipe 10 is transported in a state where density is concentrated at the bottom of the transportation pipe 10.

However, from the density concentration generated when all the metal powder 12 supplied from the charging pipe 14 falls to the bottom of the transportation pipe 10, the density concentration of the metal powder 12 generated in each of the transportation paths 18a and 18b is obtained. Is extremely low, and the metal powder 12 is smoothly transported in the transportation paths 18a and 18b. That is, when all the metal powders 12 are supplied to the bottom of the transportation pipe 10 and the transportation is impossible due to a large concentration of density, the inside of the pipe 10 intersects with the direction of gravity. With the simple structure of arranging the partition plate 16 in the horizontal state, the same amount of the metal powder 12 can be smoothly and efficiently transported.

FIG. 3 shows a transportation pipe according to a second embodiment of the present invention. Basically, similarly to the first embodiment, an upper side of the horizontally arranged transportation pipe 10 is provided. The input pipe 14 is vertically connected. Inside the transportation pipe 10, two partition plates 16, 16 are arranged in parallel in the vertical direction in a horizontal state. The two partition plates 16 and 16 define three upward and downward transportation paths 18a, 18b and 18c inside the downstream side of the connection portion of the transportation piping 10 with the charging pipe 14. Further, the upstream end of the upper partition plate 16 extends from the downstream end of the charging pipe 14 to a position of about 1/3 of its inner diameter, and the upstream end of the lower partition plate 16 is It is set so as to extend from the downstream end of the charging pipe 14 to a position of about ⅔ of its inner diameter. As a result, the metal powder 12 that is vertically charged from the charging pipe 14 is separated by the two partition plates 16 and 16 and is uniformly supplied to each of the transportation paths 18a, 18b and 18c.

Therefore, also in the second embodiment, the metal powder 12 supplied from the charging pipe 14 can be evenly separated and transported in the transport paths 18a, 18b, 18c, and the gravity acting on the metal powder 12 can be avoided. The density concentration due to can be suppressed to be small. As a result of this, it is possible to use the blower having the same line diameter and the same output to enable the transport of more metal powder 12.

FIG. 4 shows a transportation pipe according to a third embodiment of the present invention. The pipe 10 includes a horizontal portion 10a to which a blower is connected at an appropriate position on the downstream side, and the horizontal portion 10a. The bend part 10b is connected to the upstream side of the bend part and is bent by 90 °, and the vertical part 10c is connected to the bend part 10b and is opened upward. Then, the metal powder 12 is supplied from the upper opening of the vertical portion 10c.

A partition plate 16 composed of a horizontal portion 16a, a bend portion 16b and a vertical portion 16c is provided inside the transportation pipe 10 across the horizontal portion 10a, the bend portion 10b and the vertical portion 10c. It defines two transportation routes 18a and 18b. The horizontal portion 16a of the partition plate 16 facing the horizontal portion 10a is disposed in a horizontal state intersecting the direction of gravity, and defines the transportation paths 18a and 18b in a vertical relationship with the horizontal portion 16a interposed therebetween. It is like this. Further, the vertical portion 16c arranged in the vertical portion 10c of the transportation pipe 10 faces the position where the metal powder 12 supplied to the vertical portion 10c can be evenly separated into the transportation paths 18a and 18b.

In the third embodiment, the metal powder 12 sucked together with the air from the vertical portion 10c is separated by the vertical portion 16c of the partition plate 16 arranged inside the vertical portion 10c, and the transportation path 18a is separated. , 18b are evenly supplied. As a result, the concentration of the density of the metal powder 12 transported on the horizontal portion 10a that receives the action of gravity can be suppressed to a low level, and efficient transportation becomes possible.

FIG. 5 shows a transportation pipe according to a fourth embodiment of the present invention. The construction of the pipe 10 is the same as that of the third embodiment, but the opening of the vertical portion 10c is It is designed to point downwards. That is, the metal powder 12 stored in the container 20 is sucked into the vertical portion 10c together with air and then transported to the downstream side along the horizontal portion 10a. Also in this case, the metal powder 12 sucked up by the vertical portion 10c is evenly separated into the respective transportation paths 18a, 18b by the partition plate 16 to achieve smooth and efficient transportation in the horizontal portion 10a where gravity acts. You can

[0021]

[Experimental example]

 Here, the results of the experiments conducted under the following conditions for the above-described first to fourth examples are shown in the following table. 90 A (outer diameter 101.6φ, wall thickness 2.1 mm) is used as the transport pipe 10, and 50 A (outer diameter 6 0.5φ, wall thickness) is used as the charging pipe 14 connected to the transport pipe 10. The thickness was 1.65 mm). In the third and fourth embodiments, the horizontal portion 10a, the bend portion 10b and the vertical portion 10c have the same diameter. Further, the transportation pipe 10 is provided with a bend portion to have a total length of 10 m. Then, as a premise of transporting the metal powder 12 by the blower, a case where the partition plate 16 is not provided inside the transportation pipe 10 to which the charging pipe 14 is connected is set as a “comparative example”. Further, as the metal powder 12, solder powder having an average particle diameter of 100 μm (true specific gravity 8.4, bulk specific gravity 5) was used.

[0022]

As can be seen from this table, the conventional transportation pipe shown in the comparative example has a smaller transportation amount than the other examples. On the other hand, according to the transportation pipe 10 of this example, it was confirmed that the transportation amount was large.

In the examples, the case where air is used as the transport medium has been described, but the present application is not limited to this, and when transporting a metal powder that may be oxidized by contact with air, You may make it use inert gas, such as Ar. Further, the powder is not limited to metal powder, but cereals, cement, and the like also have the same effect.

[0025]

[Effect of device]

 As described above, according to the powder air flow transport pipe of the present invention, the powder transport pipe has a simple structure in which a partition plate that intersects the direction of action of gravity is horizontally arranged in the pipe. The efficiency can be improved. That is, even if the diameter of the pipeline is the same as the conventional one, it is possible to transport a large amount of powder without increasing the feeding force, which has the advantage of improving time efficiency and reducing equipment costs. .

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a transportation pipe according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the transportation pipe according to the first embodiment.

FIG. 3 is a vertical sectional side view showing a transportation pipe according to a second embodiment.

FIG. 4 is a vertical sectional side view showing a transportation pipe according to a third embodiment.

FIG. 5 is a vertical sectional side view showing a transportation pipe according to a fourth embodiment.

[Explanation of symbols]

 10 Transport Pipe 10c Vertical Part 12 Metal Powder 14 Input Pipe 16 Partition Plate 18a, 18b, 18c Transport Route

Claims (2)

[Scope of utility model registration request] 1. A pipe (10) for transporting powder (12) by air flow.
At least one partition plate (16) is arranged inside the container, and the partition plate (16) extends horizontally in the direction intersecting the direction of gravity, and a plurality of powder transport paths are provided inside the pipe. (18a, 18b, 1
Pneumatic transportation pipe for powder characterized by defining 8c) in a vertical relationship. 2. The powder supply port (14, 10c) provided on the upstream side of the partition plate (16) in the transportation direction of the powder (12) and the powder supply port (14, 10c) provided in the pipe (10) The air flow of the powder according to claim 1, wherein the powder (12) supplied from the ports (14, 10c) is in a positional relationship such that the powder (12) can be evenly separated into the respective powder transport paths (18a, 18b, 18c). Transportation piping.