JP2002308428A - Method and apparatus for transporting particulates containing fine powder - Google Patents

Abstract

(57) [Problem] To provide a transportation method for pneumatically transporting a granular material containing fine powder from a primary tank to a secondary tank without causing a problem of clogging. A transportation method for pneumatically transporting a granular material (m) containing fine powder from a primary tank (1) to a secondary tank (CA),
The gas AR separated by the secondary collection means 5 from the powder transported in the secondary tank CA is returned to the interior of the powder m stored in the primary tank 1 and the powder AR is removed. The filtered gas AF filtered through the primary tank 1
Exhaust from

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transportation method and a transportation apparatus for pneumatically transporting fine particles containing fine powder such as phenol resin particles from a primary tank to a secondary tank.

2. Description of the Related Art In the case of pneumatically transporting a granular material such as plastic from a primary tank to a secondary tank, a transport method or a transport apparatus as shown in FIG. 6A is generally used. In this figure, reference numeral 101 denotes a primary tank that stores a granular material m containing fine powder, and 102 denotes a primary tank.
A pneumatic transport means 105 for transporting the powder m stored in 1 to the secondary side by pressurized gas, 105 is a secondary collection means for separating gas from the pneumatically transported powder m, 106 is A filter for removing fine powder from the separated gas, 107
Is a suction blower for sucking the separated gas. CA
Is a material hopper provided in the resin molding machine C. In this example, the material hopper is a secondary tank that receives the transportation of the granular material m containing the fine powder from the primary tank 101. When the granules are pellets of a thermoplastic resin, the amount of the mixed fine powder is small, and even with such a transportation method, the granules can be transported for a sufficiently long time. The powder is
Granular material m containing fine powder mm as shown in FIG.
(For example, phenolic resin), this fine powder mm
Is not sufficiently collected by the secondary side collecting means 105, and is filtered by the filter 106.
6 was clogged and could not be transported.

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and is intended to provide a powdery material containing fine powder,
An object of the present invention is to provide a transportation method and a transportation device that can satisfactorily transport pneumatically from a primary tank to a secondary tank without causing a problem of clogging.

According to the first aspect of the present invention, there is provided a method for transporting fine particles containing fine powder by pneumatic transport of the fine particles containing fine powder from a primary tank to a secondary tank. The gas separated from the granular material transported in the secondary tank is refluxed inside the granular material stored in the primary tank, and is filtered by the granular material. It is characterized by exhausting from the tank.
Here, the powder containing the fine powder is typically the above-mentioned phenol resin powder, but it is generally difficult to obtain a predetermined powder particle shape when providing it as a raw material for resin molding. This means that once a large solid is formed, the solid must be pulverized into powder. Specifically, for example, thermosetting resin particles such as urea resin, melamine resin, alkyd resin, unsaturated polyester resin, dialinphthalate resin, epoxy resin, silicon resin, polyurethane resin, and glass powder, Rock salt powder and the like can be mentioned. In this method of transporting powder and granules, the powder and granules are self-filtered, used for pneumatic transport, separated in a secondary tank, and a gas containing many fine powders is still stored in a primary tank. The powder is returned to the inside of the powder, and the fine powder is filtered by the powder itself and then exhausted. Since the fine powder contained in the powder plays a role of filtering the fine powder, clogging is performed. The problem described above does not occur, and a powder containing fine powder can be satisfactorily transported by air. The transportation device for fine particles containing fine powder according to claim 2, which is a transportation device for pneumatically transporting the fine particles containing fine powder from the primary tank to the secondary tank, wherein a lower portion of the primary tank is provided. A pneumatic transport means for pneumatically transporting the stored powder and granules to the secondary tank, and an exhaust means for exhausting gas inside the primary tank at an upper portion thereof, wherein the secondary tank Inside, comprises a secondary side collecting means for separating gas from the granular material pneumatically transported from the primary side tank, the gas separated by the secondary side collecting means of the secondary side tank is The gas is refluxed to the primary-side collecting means of the primary tank, and the refluxed gas is introduced into the inside of the granular material stored in the primary tank, and is filtered by the granular material. It is characterized in that the air is exhausted by the exhaust means. This apparatus for transporting granular material realizes the method of claim 1 and exhibits the same effect as that of claim 1. The transportation device for a granular material containing fine powder according to claim 3 is the transportation device according to claim 2, further comprising: a gas inside the primary tank that is refluxed from the secondary tank. A primary-side collecting means for separating the powdery and granular materials, wherein the gas separated by the secondary-side collecting means of the secondary tank is returned to the primary-side collecting means; After further separating the remaining particles by the side collecting means, the gas after the reflux separation is introduced into the inside of the particles stored in the primary tank, and after filtering through the particles, the gas is filtered. It is characterized in that the air is exhausted by the exhaust means of the primary tank. Compared with the transport device of claim 2, the transport device for the granular material is provided with primary-side collection means in the primary-side tank instead of directly introducing the recirculated gas into the stored granular material, After further separating the remaining powdery material, the gas after reflux separation is introduced into the powdery material and self-filtered, so that the burden of self-filtration is less. According to a fourth aspect of the present invention, there is provided the transportation device for fine particles containing fine powder according to the second or third aspect, wherein the propulsion unit of the pneumatic transportation unit provided at a lower portion of the primary tank is provided. , Are provided along the direction of acceleration of gravity from the outlet of the primary side collecting means. This granular material transport device defines the direction of the propulsion section of the pneumatic transport means, and in the case of ordinary granular material, the suction force of the back pressure generated in the propulsion section of the pneumatic transport means causes the primary tank The powder at the lower part is naturally sucked into the propulsion unit and transported by power, but the powder containing fine powder has a high degree of snagging between the powder and granules. The lower granular material is not naturally sucked into the propulsion unit. Therefore, as one method, the direction of the propulsion unit is made to coincide with the direction in which the granular material at the bottom of the tank falls down due to the acceleration of gravity, so that it does not go against the direction of gravity, the granular material in this part Is transported to the propulsion unit so that the pneumatic transport means can pneumatically transport the fine particles containing the fine powder. The transportation device for a granular material containing fine powder according to claim 5, wherein the transportation device according to any one of claims 2 to 4, wherein the exhaust means of the primary tank is configured to supply a powder from a gas to be exhausted. It is characterized in that a filtering means for filtering fine powder of granules is provided. In this transportation device for granular material, a filtering means is provided in the exhaust means. Originally, such filtration means is unnecessary when the filtration is performed by the granular material itself. However, when the granular material remaining in the primary tank decreases or disappears, the self-filtration is performed. Insufficient or no function. The filtering means filters exhaust gas at that time.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an overall configuration of an example of a granular material transport device according to the present invention. The transportation device 10 of the granular material containing the fine powder includes:
A primary tank 1 for storing powders and granules m containing fine powder to be pneumatically transported at a transportation source, and a pneumatically transported powder and particulates m provided below the primary tank 1 to a destination. , A primary-side collecting means 3, which is provided inside the primary tank 1 and separates the granular material m from a gas which is used for pneumatic transportation and is recirculated from the destination, and the primary-side tank 1) an exhaust means 4 for exhausting gas inside, and a secondary-side collecting means 5 provided in a secondary tank CA as a transport destination and for separating gas from the granular material m pneumatically transported from the primary tank 1. Have. Here, the case where the transport destination from the primary tank 1 that is the transport source is a resin molding machine C that manufactures a resin molded product using the granular material m as a material is illustrated. The material hopper CA of the resin molding machine C is used. The transport device 10 further supports and mounts the gas regulator 6a that adjusts the pressure of the pressurized gas supplied to the pneumatic transport means 2 and removes moisture from the pressurized gas, and the primary tank 1. A base 6b on which a gas regulator 6a and the like are installed, a control panel 7a for controlling the entire transport apparatus 10, and a warning light 7b for giving a warning by a command from the control panel 7a are provided. The primary side tank 1 is a powder m
A hopper-shaped tank body 1a usually used as a storage means, a discharge portion 1b provided at the lower portion for discharging the stored powder and granules, and a powder portion provided at an appropriate position of the tank body 1a and stored in the tank 1. It comprises a level detector 1c for detecting a predetermined storage level of the granules m, a lid 1d for opening and closing the upper opening of the tank body 1a, and an inlet 1e for introducing gas refluxed into the tank 1. . The pneumatic transport means 2 includes a propulsion unit 2a for supplying pressurized gas to the pneumatically transported powder and granules, and a guide cylinder 2b for guiding the pneumatically extruded powder and particles by the propulsion unit 2a. Will be described later with reference to FIG. In this example, three sets of pneumatic transport means 2 are provided below the primary tank 1 and 3
The powdery material can be pneumatically transported to the two secondary tanks, in this case, the material hoppers of the three resin molding machines. As a result, the three recirculated gases are also discharged from the secondary tank to the primary tank. It is introduced into the inlet 1e of the side tank 1. In other words, the transport device of the present invention includes a case where there are a plurality of secondary tanks with respect to the primary tank and, of course, a case where the secondary tank is configured one-to-one. The primary-side collecting means 3 includes an introduction part 3a that guides gas from the introduction port 1e of the primary-side tank 1 to the primary-side collection means 3, and a cyclone that separates the powder m from the gas refluxed by the introduction part 3a. 3b, the gas AR (reflux gas and fine powder mm) separated by the cyclone 3b
And a discharge port 3c that guides the mixture into the granular material m stored in the primary tank 1. Exhaust means 4
Has an exhaust pipe 4a provided above the tank body 1a of the primary tank 1, and a filtering means 4b provided inside the exhaust pipe 4a. The secondary-side collecting means 5 includes the primary-side collecting means 3
A cyclone 5b for separating a mixture of the transported powder and granules and the transport gas into powder and particulates, a storage unit 5c for temporarily storing the powder and particulates separated by the cyclone 3b, A level detector 5d for detecting the storage level of the granular material in the storage unit 5c, a conduit 5e for guiding the granular material from the storage unit 5c to the secondary tank CA, and a separated gas provided at the upper part of the cyclone 5b. A recirculation port 5f for recirculation to the primary tank 1 is provided. J shown in the figure is
This is a joint J generally used to easily connect pipe sections. With such a configuration, in the transport device 10, as shown in the drawing, the gas separated by the secondary collection means 5 of the secondary tank CA is supplied from the return port 5f to the introduction port 1e of the primary tank 1. After being returned to the primary-side collecting means 3 and further separating the remaining particulate matter m from the refluxed gas AR by the primary-side collecting means 3, the gas AR after the reflux separation is converted to the primary side. Powder and granules m stored in tank 1
The gas is returned to the inside, and filtered by the granular material m itself containing fine powder to obtain a filtered gas AF. The filtered gas AF is exhausted to the outside by the exhaust means 4. In this case, since the fine powder itself contained in the powder m plays the role of filtering the fine powder, the problem of clogging does not occur, and the powder containing the fine powder can be satisfactorily transported by power.
In addition, although the evacuation means 4 is provided with the filtration means 4b, such filtration means is unnecessary when the filtration is performed by the granular material itself. However, when the amount of the granular material m remaining in the primary tank 1 decreases or disappears, the self-filtration function becomes insufficient or does not function. This filtering means 4
b filters the exhaust gas discharged to the outside at that time, and is used only for a short time during this period. Further, according to the experiment of the present inventor, while the self-filtration by the granules themselves was normally performed, it was obtained that the fine powder of the granules m did not accumulate in the filtering means 4b. I have. FIG. 2 is an enlarged view of the primary tank of FIG. Therefore, the same portions are denoted by the same reference numerals, and redundant description will be omitted. This figure enlarges the appearance of the primary side tank of FIG. 1 more, and FIG. 1 shows each part conceptually, but here, each part is shown more substantively. The structure of the primary tank 1, the pneumatic transportation means 2, and the primary collection means 3, which are essential parts of the present invention, can be clearly understood. An openable / closable lid 1d of the primary tank 1 is supported by a tank body 1a of the primary tank 1 via a hinge 1da, and is provided with a handle 1db for opening / closing. The granular material m can be charged into the primary tank 1. The level detector 1c has a built-in motor (not shown) and includes a rotating blade 1ca that is driven to rotate by the motor. The level detector 1c detects a resistance to the rotation of the rotating blade 1ca by a load torque applied to the motor. It is determined whether or not the rotary blade 1ca is stirring the granular material m to detect the storage level of the granular material m. The discharge portion 1b has a built-in guide umbrella 1f fitted into the inner periphery of the cylindrical portion without any gap, so that the powder and particles m discharged from the tank body 1a can be smoothly transferred to the pneumatic transportation means 2.
To be directed to A free caster 6c is provided under the base 6b so that the entire primary tank 1 can be moved to a desired position. FIG. 3 is a sectional view of a main part of the primary tank of FIG. This figure shows that when the recirculated gas AR containing the fine powder mm passes between the powder particles m stored in the primary tank 1, this powder particle m
Is filtered by the fine powder mm contained in the tank 1, that is, self-filtered, and as a filtered gas AF without fine powder, the tank 1
It shows the way to the top. When the filtration is performed by such a method, the granular material m that has performed the filtering action also includes the fine powder mm as in the case of the granular material m that has not yet performed the filtering action, and the fine particles mm may cause clogging. As a result, the powder m containing the fine powder mm can be stably pneumatically transported to the secondary tank over a long period of time. Also,
Here, the direction of the propulsion unit 2a of the pneumatic transport unit 2 will be described. As shown, the propulsion portion 2a of the pneumatic transport means 2 has a propulsion pipe 2 having an inner diameter once reduced and expanded.
aa, and a nozzle 2ab which is opened on the inner periphery on the inlet side of the propulsion pipe 2aa and ejects the pressurized gas AP supplied from the gas regulator 6a (see FIG. 1) in the pneumatic transport direction. The direction of the pneumatic transportation of the propulsion unit 2a is different from the conventional pneumatic transportation means, and as shown in the drawing, gravity is applied from the outlet 3c of the primary-side collecting means 3 provided inside the primary tank 1 to gravity. , That is, toward the diagonally lower left direction in the figure. In the case of ordinary particles, the particles at the lower part of the primary tank are naturally sucked into the propulsion unit by the suction force of the back pressure generated in the propulsion unit of the pneumatic transportation means and pneumatically transported. The contained powdery material has a large hooking property between the powdery material and the powdery material at the lower part of the tank is not naturally sucked into the propulsion unit by only the suction force of the back pressure. Therefore, as one method, the direction of the propulsion unit 2a is made to coincide with the direction in which the particles at the lower part of the tank 1 are dropped by the acceleration of gravity so as not to go against the direction of gravity, m is sent to the propulsion unit 2a, so that the pneumatic transport means 2 can pneumatically transport the fine particles containing fine powder. The method of feeding the granular material to the entrance of the propulsion unit 2a in this manner is not only a method using the acceleration of gravity but also another method of providing a vibrating means or a stirring means at the lower part of the tank. Alternatively, another method may be used in combination with this method. FIG. 4 is an enlarged view showing the secondary side collecting means of FIG. This figure also shows, in a larger scale, the external appearance of the secondary side collecting means 5 as shown in FIG. 2 with respect to FIG. Part 5a, cyclone 5b, storage part 5c,
The structure of the level detector 5d, the conduit 5e, and the reflux port 5f is clearly understood. FIG. 5 is a schematic view showing the overall configuration of another example of the granular material transport device according to the present invention. This transport device 10A does not include the primary-side collecting means 3 as compared with the transport device 10 shown in FIG. 1, and instead has the powder containing the fine powder mm stored in the primary tank 1 with the recirculated gas AR as it is. A different point is that a reflux introducing section 3A for introducing into the body m is provided. Also in this case, the fine particles contained in the recirculated gas AR are filtered by the self-filtration of the granular material m containing the fine particles mm, and the filtered gas AF containing no fine particles is supplied to the exhaust means 4.
Is supplied, and the filtering means 4b provided in the exhaust means 4
Clean filtered gas AF without burdening the air
Is released to the outside air, and the pneumatic transport of the granular material m including the fine powder mm can be favorably maintained without causing clogging. The gas referred to here includes not only air, that is, the atmosphere, but also a gas such as nitrogen selected according to the characteristics of the granular material to be pneumatically transported.

According to the method for transporting a granular material containing fine powder according to the first aspect, the granular material is self-filtered,
The gas used for pneumatic transportation, separated in the secondary tank, and still contains a large amount of fine powder, is returned to the inside of the granular material stored in the primary tank, and the fine powder is filtered by the granular material itself. Because the fine powder contained in the powder plays a role of filtering the fine powder, the problem of clogging does not occur, and the powder containing the fine powder is transported well by power. Can be. According to the second aspect of the present invention, the method of the first aspect is realized, and the same effect as the first aspect is exhibited. According to the apparatus for transporting fine particles containing fine powder according to the third aspect, in addition to the effect of the second aspect, the recirculation gas is not directly introduced into the stored granular material, but is supplied to the primary tank. A primary-side collecting means is provided, and after further separating the remaining particulates, the gas after reflux separation is introduced into the particulates and self-filtered, so that the burden of self-filtration is smaller. .
According to the apparatus for transporting fine particles containing fine powder according to the fourth aspect, in addition to the effect of any of the second and third aspects, the direction of the propulsion unit is lowered by the acceleration of gravity at the lower part of the tank. The direction of gravity is matched to the direction of falling, so that it does not go against the direction of gravity, so that the powder in this part is sent to the propulsion unit, so that the powder Can be transported. According to the apparatus for transporting granular material containing fine powder according to the fifth aspect, in addition to the effect of any one of the second to fourth aspects, since the filtering means is provided in the exhaust means, the powder remains in the primary tank. Exhaust can be filtered even when the amount of powder is small or missing, and even if the self-filtration function of the powder containing fine powder is insufficient or no longer functions. Does not pollute the external environment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an example of a granular material transport apparatus according to the present invention.

FIG. 2 is an enlarged view of a primary tank of FIG. 1;

FIG. 3 is a sectional view of a main part of the primary tank of FIG. 1;

FIG. 4 is an enlarged view showing a secondary side collecting means of FIG. 1;

FIG. 5 is a schematic diagram showing the overall configuration of another example of the granular material transport device according to the present invention.

FIG. 6A is a schematic diagram showing the entire configuration of a conventional granular material transport device, and FIG. 6B is a diagram showing an example of a granular material containing fine powder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Primary tank 2 Pneumatic transportation means 2a Propulsion part 3 Primary collection means 3c Outlet 3A Reflux introduction part 4 Exhaust means 4b Filtration means 5 Secondary collection means 10 Transport device m Powders (including fine powder) mm Fine powder C Resin molding machine CA Secondary tank (material hopper) AR Reflux gas AF Filtered gas

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[Procedure amendment]

[Submission date] April 25, 2001 (2001.4.2
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] A method and apparatus for transporting fine particles containing fine powder

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transportation method and a transportation apparatus for pneumatically transporting fine particles containing fine powder such as phenol resin particles from a primary tank to a secondary tank.

[0002]

2. Description of the Related Art In the case of pneumatically transporting a granular material such as plastic from a primary tank to a secondary tank, a transport method or a transport apparatus as shown in FIG. 6A is generally used.

In FIG. 1, reference numeral 101 denotes a primary tank storing powders m containing fine powder, and reference numeral 102 denotes a force for transporting the powders m stored in the primary tank 101 to a secondary side by pressurized gas. The transport means 105 is a secondary-side collecting means 106 for separating gas from the pneumatically transported granular material m.
Is a filter that removes fines from this separated gas,
107 is a suction blower for sucking the separated gas.

[0004] CA is a material hopper provided on the resin molding machine C. In this example, CA is provided from the primary tank 101.
This is a secondary tank that receives the transportation of the granular material m containing the fine powder.

When the particles are thermoplastic resin pellets, the amount of the fine particles mixed is small, and even with such a transportation method, the particles can be transported for a sufficiently long period. However, the granular material m (for example, phenol resin) in which the granular material includes fine powder mm as shown in FIG.
In this case, the fine powder mm is not sufficiently collected by the secondary-side collecting means 105, and is filtered by the filter 106, so that the filter 106 is immediately clogged and cannot be transported. Had occurred.

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and is intended to provide a powdery material containing fine powder,
An object of the present invention is to provide a transportation method and a transportation device that can satisfactorily transport pneumatically from a primary tank to a secondary tank without causing a problem of clogging.

[0007]

According to the first aspect of the present invention, there is provided a method for transporting fine particles containing fine powder by pneumatic transport of the fine particles containing fine powder from a primary tank to a secondary tank. The gas separated from the granular material transported in the secondary tank is refluxed inside the granular material stored in the primary tank, and is filtered by the granular material. It is characterized by exhausting from the tank.

[0008] Here, the powder containing fine powder is typically the above-mentioned powder of phenolic resin. Generally, when the powder is provided as a raw material for resin molding, it has a predetermined powder shape. It is difficult to do so, and once a large solid is formed, the solid must be pulverized into powder. Specifically, for example, thermosetting resin particles such as urea resin, melamine resin, alkyd resin, unsaturated polyester resin, dialinphthalate resin, epoxy resin, silicon resin, polyurethane resin, and glass powder,
Rock salt powder and the like can be mentioned.

[0009] This method of transporting the granular material is for self-filtration of the granular material, which is used for pneumatic transportation, is separated in a secondary tank, and is used to remove a gas containing a large amount of fine powder from the primary tank. The powder is returned to the inside of the powder and granules stored therein, and the fine powder is filtered and then exhausted by the powder itself, and the fine powder contained in the powder plays a role of filtering the fine powder. In addition, the problem of clogging does not occur, and the powder containing fine powder can be satisfactorily transported by air.

[0010] The transportation device for fine particles containing fine powder according to claim 2 is a transportation device for pneumatically transporting the fine particles containing fine powder from a primary tank to a secondary tank. At the lower part of the tank, there is provided a pneumatic transport means for pneumatically transporting the stored granules to the secondary tank, and at the upper part thereof, there are provided exhaust means for exhausting gas in the primary tank. Inside the secondary tank, there is provided a secondary collecting means for separating gas from the granular material pneumatically transported from the primary tank, and separated by the secondary collecting means of the secondary tank. The gas is refluxed to the primary tank, the refluxed gas is introduced into the inside of the granular material stored in the primary tank, and after being filtered by the granular material, the exhaust gas of the primary tank is used. It is characterized by exhausting.

This apparatus for transporting a granular material realizes the method of the first aspect, and exhibits the same effect as the first aspect.

According to a third aspect of the present invention, there is provided the transportation device for fine particles containing fine powder according to the second aspect, wherein the primary tank is further refluxed from the secondary tank. A primary-side collecting means for separating the granular material from the coming gas; and refluxing the gas separated by the secondary-side collecting means of the secondary tank to the primary-side collecting means. After the remaining particulates are further separated by the primary side collecting means from above, the gas after the reflux separation is introduced into the inside of the particulates stored in the primary side tank, and filtered by the particulates. Later, the air is exhausted by the exhaust means of the primary tank.

In this apparatus for transporting granular material, the primary-side tank is provided with a primary-side collecting means in the primary tank instead of directly introducing the recirculated gas into the stored granular material. After the remaining powder is further separated, the gas after reflux separation is introduced into the powder and self-filtered, so that the burden of self-filtration is reduced.

According to a fourth aspect of the present invention, there is provided the transportation device for fine particles containing fine powder according to the second or third aspect, wherein the pneumatic transportation means provided at a lower portion of the primary tank is provided. A propulsion unit is provided so as to extend along the direction of acceleration of gravity from the outlet of the primary collection means.

This device for transporting a granular material defines the direction of the propulsion unit of the pneumatic transport means.
Due to the suction force of the back pressure generated in the propulsion section of the pneumatic transport means, the powdery material at the lower part of the primary tank is naturally sucked into this propulsion section and transported pneumatically. The particles are also easily caught by each other, and the powder at the lower part of the tank is not naturally sucked into the propulsion unit by only the suction force of the back pressure.

Therefore, as one method, the direction of the propulsion unit is made to coincide with the direction in which the granular material at the lower part of the tank falls down due to the acceleration of gravity so as not to go against the direction of gravity. The granules are sent to the propulsion unit so that the pneumatic transport means can pneumatically transport the granules containing the fine powder.

According to a fifth aspect of the present invention, there is provided the transportation device for a particulate material containing fine powder according to any one of the second to fourth aspects, in which the exhaust means of the primary tank is about to be exhausted. It is characterized in that a filtering means for filtering the fine powder of the granular material from the gas is provided.

In this apparatus for transporting granular material, the exhaust means is provided with a filtering means. Originally, such filtration means is unnecessary when the filtration is performed by the granular material itself. However, when the granular material remaining in the primary tank decreases or disappears, the self-filtration is performed. Insufficient or no function. The filtering means filters exhaust gas at that time.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing an entire configuration of an example of a granular material transport apparatus according to the present invention.

A transportation device 10 for the powder or granular material containing the fine powder
Is a primary tank 1 for storing a powder m containing fine powder to be subjected to pneumatic transport at a transport source, and pneumatically transports the stored particulate m provided at a lower portion of the primary tank 1 to a destination. And a primary-side collecting means 3 which is provided inside the primary tank 1 and separates the granular material m from a gas which is returned from the destination after being used for the pneumatic transportation. Exhaust means 4 for exhausting gas from the inside of the side tank 1, secondary collecting means provided in the secondary tank CA, which is a transport destination, for separating gas from the granular material m pneumatically transported from the primary tank 1 5 is provided.

Here, the case where the transport destination from the primary tank 1, which is the transport source, is a resin molding machine C for producing a resin molded product using the granular material m as a material is illustrated. CA is a material hopper CA of the resin molding machine C.

The transport device 10 further supports the primary tank 1 and a gas regulator 6a for adjusting the pressure of the pressurized gas supplied to the pneumatic transport means 2 and removing water from the pressurized gas. A base 6b on which a gas regulator 6a and the like are installed, a control panel 7a for controlling the entire transport device 10, and a warning light 7 for giving a warning or the like according to a command from the control panel 7a.
b.

The primary tank 1 includes a hopper-shaped tank main body 1a which is usually used as a storage means for storing the granular material m,
A discharge unit 1b provided at a lower portion thereof for discharging the stored particles, a level detector 1c provided at an appropriate position of the tank body 1a and detecting a predetermined storage level of the particles m stored in the tank 1; It comprises a lid 1d for opening and closing the upper opening of the tank body 1a so as to be openable and closable, and an inlet 1e for introducing gas refluxed into the tank 1.

The pneumatic transport means 2 includes a propulsion section 2a for supplying pressurized gas to the pulverized material to be pneumatically transported, and a guide cylinder 2b for guiding the pneumatically extruded powder material by the propulsion section 2a. The details will be described later with reference to FIG.

In this example, three sets of pneumatic transport means 2 are provided below the primary tank 1 and the powder and granules are placed in three secondary tanks, in this case, three material hoppers of a resin molding machine. Pneumatic transportation can be performed, and as a result, three recirculated gases are also introduced into the inlet 1e of the primary tank 1 from the secondary tank. In other words, the transport device of the present invention includes a case where there are a plurality of secondary tanks with respect to the primary tank and, of course, a case where the secondary tank is configured one-to-one.

The primary-side collecting means 3 includes an introduction part 3a for guiding the gas from the introduction port 1e of the primary-side tank 1 to the primary-side collection means 3, and a powder m / g from the gas refluxed by the introduction part 3a.
3b, and an outlet 3c for guiding the gas AR (mixture of recirculated gas and fine particles mm) separated by the cyclone 3b to the inside of the granular material m stored in the primary tank 1. .

The exhaust means 4 includes an exhaust pipe 4a provided above the tank body 1a of the primary tank 1, and a filtering means 4b provided inside the exhaust pipe 4a.

The secondary-side collecting means 5 includes an inlet 5a similar to the primary-side collecting means 3, a cyclone 5b for separating a mixture of the transported granular material and the transport gas into a granular material and a gas, Storing section 5c for temporarily storing the granular material separated by cyclone 3b, level detector 5d for detecting the storage level of the granular material in storing section 5c, secondary tank C from storing section 5c.
A conduit 5e for guiding the powder to A, and a recirculation port 5f provided above the cyclone 5b for recirculating the separated gas to the primary tank 1 are provided.

In addition, J shown in the figure is a joint J that is generally used for easily connecting pipe sections.

With such a configuration, in the transport device 10, as shown in the figure, the gas separated by the secondary collection means 5 of the secondary tank CA is supplied to the primary tank 1 through the recirculation port 5f.
After being returned to the primary-side collecting means 3 and further separating the remaining particles m from the refluxed gas AR by the primary-side collecting means 3, the gas AR after the reflux separation
Is returned to the inside of the granular material m stored in the primary tank 1, and is filtered by the granular material m itself containing fine powder to form a filtered gas AF. I am trying to do it.

[0032] In this case, since the fine powder itself contained in the powder m plays a role of filtering the fine powder, the problem of clogging does not occur, and the powder containing the fine powder can be favorably transported by power. Can be.

Although the exhausting means 4 is provided with a filtering means 4b, such filtering means is not required when the filtering is performed by the granular material itself. However, when the amount of the granular material m remaining in the primary tank 1 decreases or disappears, the self-filtration function becomes insufficient or does not function.

The filtering means 4b filters the exhaust gas discharged to the outside at that time, and is used only for a short time during this period.

Further, according to the experiment of the present inventor, it was found that the fine powder of the granular material m does not accumulate in the filtering means 4b during the normal self-filtration by the granular material itself. Have gained.

FIG. 2 is an enlarged view of the primary tank of FIG. Therefore, the same portions are denoted by the same reference numerals, and redundant description will be omitted.

In this figure, the appearance of the primary side tank of FIG. 1 is further enlarged, and in FIG. 1, each part is conceptually shown. The structure of the primary side tank 1, the pneumatic transportation means 2, and the primary side collection means 3, which are essential parts of the present invention, is clearly understood.

The openable / closable lid 1d of the primary tank 1 is
The tank body 1 of the primary tank 1 via the hinge 1da
a, which is provided with a handle 1db for opening and closing, and is manually opened and closed so that the granular material m can be easily put into the primary tank 1.

The level detector 1c has a built-in motor (not shown), and the rotary blade 1c is driven to rotate by the motor.
a, the resistance to the rotation of the rotor 1ca is detected by the load torque applied to the motor, and the rotor 1c
It is determined whether or not a is stirring the granular material m to detect the storage level of the granular material m.

The discharging portion 1b has a built-in guide umbrella 1f fitted into the inner periphery of the cylindrical portion without any gap, so that the particles m discharged from the tank main body 1a can be smoothly transferred to the pneumatic transportation means 2. To be led to.

A free caster 6c is provided below the base 6b so that the entire primary tank 1 can be moved to a desired position.

FIG. 3 is a sectional view of a main part of the primary tank of FIG.

This figure shows a recirculated gas AR containing fine powder mm.
Is filtered by the fine particles mm contained in the granular material m when passing between the granular materials m stored in the primary tank 1, that is, self-filtered to obtain a filtered gas AF without fine powder. , Toward the top of the tank 1.

When the filtration is performed by such a method, the granular material m that has performed the filtering action also includes the fine powder mm like the granular material m before performing the filtering action, and is clogged by the fine powder mm. Does not occur, and the granular material m including the fine powder mm can be stably pneumatically transported to the secondary tank for a long time.

Here, the direction of the propulsion section 2a of the pneumatic transportation means 2 will be described.

As shown, the propulsion section 2a of the pneumatic transportation means 2 has a propulsion pipe 2aa whose inner diameter has once decreased and expanded, and an opening on the inner periphery on the inlet side of the propulsion pipe 2aa.
A nozzle 2ab for ejecting the pressurized gas AP supplied from the gas regulator 6a (see FIG. 1) in the pneumatic transport direction is provided.

The direction of the pneumatic transportation of the propulsion section 2a is different from the conventional pneumatic transportation means, and as shown in the drawing, the outlet of the primary side collection means 3 provided inside the primary side tank 1 as shown in the figure. From 3c, it is directed along the direction of acceleration of gravity, that is, toward the diagonally lower left direction in the figure.

In the case of ordinary particles, the particles at the lower part of the primary tank are naturally sucked into the propulsion section and pneumatically transported by the suction force of the back pressure generated in the propulsion section of the pneumatic transportation means. In addition, the granular material containing the fine powder has a large catching property between the granular materials, and the granular material at the lower part of the tank is not naturally attracted to the propulsion unit only by the suction force of the back pressure.

Therefore, as one method, the direction of the propulsion unit 2a is made to coincide with the direction in which the granular material at the lower part of the tank 1 is dropped by the acceleration of gravity so as not to go against the direction of gravity. The pulverized material m is sent to the propulsion unit 2a, so that the pneumatic transport means 2 can pneumatically transport the pulverized material containing fine powder.

The method of feeding the powder to the entrance of the propulsion unit 2a is not limited to the method using the acceleration of gravity, but may be another method such as providing vibration means or stirring means at the lower part of the tank. A method may be used, and another method may be used in combination with this method.

FIG. 4 is an enlarged view showing the secondary side collecting means of FIG.

This figure also shows, in a larger scale, the appearance of the secondary-side collecting means 5 as shown in FIG. 2 with respect to FIG. Introducing part 5
a, cyclone 5b, storage unit 5c, level detector 5d,
The structure of the conduit 5e and the reflux port 5f is clearly understood.

FIG. 5 is a schematic view showing the overall configuration of another example of the granular material transport device according to the present invention.

This transport device 10A is different from the transport device 10 shown in FIG. 1 in that the primary collecting means 3 is not provided.
The difference is that a reflux introduction section 3A is provided to introduce the reflux gas AR into the granular material m containing fine powder mm stored in the primary tank 1 as it is.

Also in this case, the fine particles contained in the reflux gas AR are filtered by the self-filtration of the granular material m containing the fine particles mm, and the filtered gas AF containing no fine particles is supplied to the exhaust means 4. A clean filtered gas A without imposing a load on the filtering means 4b provided in the exhaust means 4.
F is released to the outside air, and the pneumatic transport of the granular material m including the fine powder mm can be favorably maintained without causing clogging.

The gas referred to here includes not only air, that is, the atmosphere, but also a gas such as nitrogen selected according to the characteristics of the granular material to be pneumatically transported.

[0057]

According to the method for transporting a granular material containing fine powder according to the first aspect, the granular material is self-filtered,
The gas used for pneumatic transportation, separated in the secondary tank, and still contains a large amount of fine powder, is returned to the inside of the granular material stored in the primary tank, and the fine powder is filtered by the granular material itself. Because the fine powder contained in the powder plays a role of filtering the fine powder, the problem of clogging does not occur, and the powder containing the fine powder is transported well by power. Can be.

According to the second aspect of the present invention, the method of the first aspect is realized, and the same effects as those of the first aspect are exhibited.

According to the third aspect of the present invention, in addition to the effect of the second aspect, in addition to the effect of the second aspect, the recirculating gas is not directly introduced into the stored granular material, but the primary gas is recirculated. The side tank is provided with a primary-side collecting means, which further separates the remaining particulates, and then introduces the gas after reflux separation into the particulates and performs self-filtration. Is less.

According to the fourth aspect of the present invention, in addition to the effect of any of the second and third aspects, the direction of the propulsion unit is such that the granular material at the lower part of the tank is gravitational. By matching the direction of falling down with acceleration so as not to go against the direction of gravity, the powder in this part was sent to the propulsion part, so fine powder was well contained by the pneumatic transport means The powder can be transported by power.

According to the fifth aspect of the present invention, in addition to the effect of any one of the second to fourth aspects, since the filtering means is provided in the exhaust means, the primary side tank is provided. When the amount of powder or particles remaining in the powder is reduced or disappears, the exhaust gas is filtered even if the self-filtration function of the powder or powder containing fine powder becomes insufficient or stops functioning. Can not pollute the external environment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an example of a granular material transport apparatus according to the present invention.

FIG. 2 is an enlarged view of a primary tank of FIG. 1;

FIG. 3 is a sectional view of a main part of the primary tank of FIG. 1;

FIG. 4 is an enlarged view showing a secondary side collecting means of FIG. 1;

FIG. 5 is a schematic diagram showing the overall configuration of another example of the granular material transport device according to the present invention.

FIG. 6A is a schematic diagram showing the entire configuration of a conventional granular material transport device, and FIG. 6B is a diagram showing an example of a granular material containing fine powder.

[Explanation of Symbols] 1 Primary tank 2 Pneumatic transport means 2a Propulsion unit 3 Primary collection means 3c Outlet 3A Reflux inlet 4 Exhaust means 4b Filtration means 5 Secondary collection means 10 Transport device m Mm Fine powder C Resin molding machine CA Secondary tank (material hopper) AR Reflux gas AF Filtered gas

Continued on the front page F term (reference) 3F047 AA03 AA13 AB01 BA04 DB01 DB03 DB08 4D058 JA51 QA01 QA08 SA20

Claims (5)

[Claims] 1. A transportation method for pneumatically transporting a particulate material containing fine powder from a primary tank to a secondary tank, wherein a gas separated from the particulate material transported in the secondary tank is A method for transporting powder and particulate matter containing fine powder, wherein the powder is refluxed inside the powder and particulate matter stored in the primary tank, filtered by the powder and discharged from the primary tank. . 2. A transportation device for pneumatically transporting a granular material containing fine powder from a primary tank to a secondary tank, wherein a powdery material stored in a lower portion of the primary tank is transferred to the secondary tank. A pneumatic transport means for pneumatic transport to the tank, and an exhaust means for exhausting gas inside the primary tank at an upper portion thereof, and inside the secondary tank, pneumatic transport from the primary tank is performed. A secondary-side collecting means for separating gas from the granular material, wherein the gas separated by the secondary-side collecting means of the secondary tank is returned to the primary-side collecting means of the primary tank, The recirculated gas is introduced into the inside of the granular material stored in the primary tank, filtered by the granular material, and then exhausted by exhaust means of the primary tank. A device for transporting granular materials containing fine powder. 3. The transportation device according to claim 2, further comprising: a primary side collecting means inside the primary side tank for separating a powdery material from a gas recirculated from the secondary side tank. The gas separated by the secondary-side collecting means of the secondary tank is returned to the primary-side collecting means, and the primary-side collecting means further separates the remaining particles from the returned gas. After that, the gas after the reflux separation is introduced into the inside of the granular material stored in the primary tank, filtered by the granular material, and then exhausted by the exhaust means of the primary tank. A device for transporting a granular material containing fine powder, characterized in that: 4. The transportation device according to claim 2, wherein a propulsion unit of the pneumatic transportation means provided at a lower portion of the primary tank has a gravity force from an outlet of the primary collection means. An apparatus for transporting a granular material containing fine powder, the apparatus being provided along an acceleration direction. 5. The transportation device according to claim 2, wherein a filter means for filtering fine powder of a granular material from a gas to be discharged is provided in the discharge means of the primary tank. A device for transporting a granular material containing fine powder, characterized in that: