JPH06329253A - Pneumatic force-feed type conveying device - Google Patents

Abstract

PURPOSE:To provide a pneumatic force-feed type conveying device, by which the clogging of a vent pipe arranged in an air bleeding chamber is prevented and a material can be smoothly dropped into the air bleeding chamber from an inner chute. CONSTITUTION:A pneumatic force-feed type conveying device is composed in such a way as connecting an air bleeding chamber 21, a rotary feeder, and a transport pipe, in which force-fed air flows, one by one in order, and an inner chute 23 is included inside the air bleeding chamber 21. The point end of the inner chute 23 is projected from the lower end of the air bleeding chamber 21 to be inserted into the inside of a material feeding port 9 of the rotary feeder 2. On the other hand, the point end of the inner chute 23 is narrowed in half to be opened in a part C, which is the storage side from the center of the rotor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air pressure type transportation device for transporting a minute transportation material such as a powdery material, a granular material or a pelletized material to a predetermined position by means of compressed air.

[0002]

2. Description of the Related Art As a transportation device for transporting raw materials such as resin pellets and carbon powder to a molding machine or a reservoir tank, an air pressure type transportation device composed of an extraction chamber, a rotary feeder and a transportation pipe is known. ing.

FIG. 4 is an overall view showing the construction of a pneumatic pneumatic transportation device of the prior art. In FIG. 4, reference numeral 100 denotes a pneumatic conveying device of the prior art. Pneumatic transport device 1
00 is constituted by a combination of the extraction chamber 1, the rotary feeder 2 and the transport pipe 3 as described above. The bleeding chamber 1 is a member whose lower part is narrowed like a funnel, and an inner chute 5 is arranged inside. A ventilation pipe 7 is attached to the upper surface of the extraction chamber 1.

The rotary feeder 2 is sometimes called a rotary valve, and a rotor 8 is provided in a casing 4.
Are arranged. That is, the casing 4 has a cylindrical shape, is horizontally placed with its axis oriented in the horizontal direction, and the raw material supply port 9 and the raw material discharge port 11 are provided above and below the casing. The rotor 8 is an impeller-like member, a rotating shaft 12 is rotatably supported on the side surface of the casing 4, and is driven by a motor.

One end of the transport pipe 3 is a blower 1 such as a blower.
3, the other end of which opens to a tank or a molding machine at a predetermined position, and compressed air flows inside. In the pneumatic transportation device 100, the raw material supply port 9 of the rotary feeder 2 is connected to the extraction chamber 1, while the raw material discharge port 11 is provided.
Is connected to the transport pipe 3.

The raw material supplied from the inner chute 5 in the bleeding chamber 1 is cut out by a fixed amount as the rotor 8 of the rotary feeder 2 rotates, and dropped into the transport pipe 3 from the raw material discharge port 11. Then, it is carried to the predetermined position by being carried by the compressed air flowing through the transport pipe 3.

Of the prior art pneumatically powered transportation device 100,
Focusing on the lower end of the extraction chamber 1 and the structure around the raw material supply port 9 of the rotary feeder 2, the following relationships are established. FIG. 5 illustrates a prior art pneumatically driven transportation device 10.
FIG. 2 is a cross-sectional view of the main part of No. 0, showing the structure of the lower end of the extraction chamber 1 and the vicinity of the raw material supply port 9 of the rotary feeder 2.

In the extraction chamber 1 adopted in the prior art, the total length of the inner chute 5 is equal to the length of the main body 22 of the extraction chamber 1. Therefore, the height of the opening of the inner chute 5 is equal to the height of the lower surface of the extraction chamber 1,
In other words, it is equal to the height of the upper end surface of the raw material supply port 9 of the rotary feeder 2. That is, the opening of the inner chute 5 is outside the raw material supply port 9 of the rotary feeder 2.
Therefore, the opening of the inner chute 5 is located at a height considerably separated from the upper end of the rotation trajectory 10 of the rotor 8. Specifically, the distance A between the two is about 1/4 of the diameter of the rotor 8 or about 1/4 of the opening diameter of the raw material supply port 9.

Further, the center line of the inner chute 5 coincides with the center line of the rotary feeder 2, and the shape of the opening is almost circular. Therefore, in the pneumatic conveying device 100 of the related art, the raw material is dropped almost uniformly from a high position with respect to the rotor 8 of the rotary feeder 2 and spreads throughout the raw material supply port 9.

[0010]

By the way, generally, in a transporting device for transporting powder or granular material, powder or the like which is a transportation product is often clogged during transportation, and how to solve this clogging. Is a serious technical issue.
In particular, in the pneumatic feed type transportation apparatus 100 having the above-mentioned configuration, since the raw material discharge port 11 of the rotary feeder 2 is connected to the transport pipe 3 through which the compressed feed air passes, the compressed feed air flowing through the transport pipe 3 is changed to the raw material discharge port. Since it enters the inside of the rotary feeder 2 from 11 and is further blown into the extraction chamber 1 from the raw material supply port 9 of the rotary feeder 2, the extraction chamber 1 is likely to be in a high-pressure atmosphere.
Therefore, in this type of pneumatic pumping apparatus 100, the ventilation pipe 7 is attached to the extraction chamber 1 as described above, and the air that has flowed back through the rotary feeder 2 is exhausted from the extraction chamber 1 to remove the air inside and outside the extraction chamber 1. The pressure is made equal to smooth the falling of the raw material from the inner chute 5.

However, in the pneumatic transportation device 100 of the prior art, the above-mentioned ventilation pipe 7 may be clogged by the raw material during the transportation work. As a result, there is no escape place for the air blown into the extraction chamber 1 through the rotary feeder 2 and the extraction chamber 1
The inside becomes a high-pressure atmosphere, the fall of the raw material from the inner chute 5 into the extraction chamber 1 is hindered, and the supply of the raw material to the rotary feeder 2 is often stopped.

In view of the above-mentioned drawbacks of the prior art, the present invention prevents clogging of the ventilation pipe provided in the bleeding chamber and allows pneumatic pressure to smoothly drop the raw material from the inner chute 5 into the bleeding chamber 1. An object is to provide a transporting device.

[0013]

In order to achieve the above object, the inventors investigated the cause of clogging of the ventilation pipe 7 with the raw material, and found that it was roughly as follows. That is, the bleed chamber 1 has an inner chute 5 built therein,
The inner chute 5 is open near the upper end of the raw material supply port 9 of the rotary feeder 2, and the cross section of the opening is almost circular. Therefore, rotary feeder 2
The raw material is substantially evenly dropped on the upper surface of the rotor 8.

However, this type of pneumatic transportation device 1
In 00, as described above, the compressed air flowing through the transport pipe 3 flows backward from the raw material supply port 9 of the rotary feeder 2 and blows out, so that the raw material is blown up by this air. Then, a void is formed near the opening of the inner chute 5, and new raw material is more and more supplied from the inner chute 5. As a result, the amount of raw material in the bleeding chamber 1 increases, and finally it overflows from the bleeding chamber 1 to reach the ventilation pipe 7, and the ventilation pipe 7 is clogged, which prevents the raw material from falling from the inner chute 5. In addition, the raw material is ventilation pipe 7
Although not completely filled up, the blown up raw material may be sucked into the ventilation pipe 7 and clogged to cause the same phenomenon as described above.

A more detailed study of the situation in which the raw material is blown up reveals that the raw material is not uniformly blown up from the raw material supply port 9 of the rotary feeder 2, but rather on the return side and the winding side of the rotor 8. It turned out that a particularly large amount was blown out from the return side. That is, when the rotor 8 rotates in the direction of the arrow B, the rotor on the winding side C from the central axis 12 of the rotor 8 rotates with the raw material being filled, so that a gap is formed between the rotor 8 and the casing 4. There is little and it is hard for air to pass through. Meanwhile rotor 8
The rotor on the return side D from the central axis 12 has a large amount of air gaps in each part because it rotates in an empty state, and a large amount of air blows through. Therefore, in the raw material supply port 9 of the rotary feeder 2, a large amount of raw material is blown up from the return side D.

The pneumatic feed system of the present invention completed on the basis of the above findings is a chamber in which an inner chute for dropping a transported article is incorporated, a rotary feeder in which a rotor is arranged in a casing, and a pneumatic feed. An air-pneumatic transport device that has a transport pipe through which the supply port and the discharge port of the rotary feeder are connected to the lower end of the chamber and the transport pipe, respectively, and that transports the transported product discharged from the rotary feeder by the compressed air. In, the tip of the inner chute projects from the lower end of the chamber and is inserted into the feed port of the rotary feeder, and the tip of the inner chute is eccentrically narrowed, and most of it is on the winding side from the center of the rotor. It is characterized by having an opening.

[0017]

In the pneumatic pneumatic transportation apparatus of the present invention, the tip of the inner chute is eccentrically narrowed and most of the inner chute is open from the center of the rotor to the winding side. Therefore, the packages falling from the inner chute are concentrated and fall from the center of the rotor to the part on the winding side. In addition, in the pneumatic feeding type transporting apparatus of the present invention, the tip of the inner chute projects from the lower end of the chamber and is inserted into the supply port of the rotary feeder, so the drop between the opening of the inner chute and the rotor is extremely small. Therefore, the dropped package does not spread to the surroundings and exists only in the part on the winding side. Therefore, there is almost no transported material on the return side of the rotor from which a large amount of air is blown, and the transported material is not blown up.

[0018]

EXAMPLES Specific examples of the present invention will be described below. It should be noted that the same components as those of the conventional technique are denoted by the same reference numerals as those of the description of the conventional technique, and the duplicate description will be omitted. FIG. 1 is an overall view of a pneumatic transportation device according to a specific embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part of a pneumatic feeding type transportation device according to a specific embodiment of the present invention. FIG. 3 is a cross-sectional view of an essential part showing the behavior of the raw material in the portion shown in FIG.

In FIG. 1, reference numeral 20 denotes a pneumatic transportation device according to a specific embodiment of the present invention. The pneumatic delivery device 20 of the present embodiment is similar to the prior art in that the extraction chamber 2
1, a rotary feeder 2 and a transport pipe 3 are combined. The main body 22, the rotary feeder 2, and the transport pipe 3 of the extraction chamber 21 are exactly the same as those in the conventional technique, and their coupling relationship is not different from that in the conventional technique.

The characteristic feature of this embodiment is that the inner chute 23 inserted in the extraction chamber 21 is
The shape and its mounting position. The inner chute 23 used in this embodiment is a tubular member having a circular cross section for the most part, and the tip portion is narrowed. That is, at the tip of the inner chute 23, the flat plate 24 is attached obliquely to the axis, and the opening 25 at the tip is eccentric in a semicircular shape.

The inner chute 23 is longer than the entire length of the main body 22 of the bleeding chamber 21, and the tip portion of the inner chute 23 is the mounting flange 2 at the lowermost end of the bleeding chamber 21.
It is located below 6. That is, the tip of the inner chute 23 is connected to the raw material supply port 9 of the rotary feeder 2.
Has been inserted inside. The height of the opening 25 is close to the rotor 8. The distance E between the opening 25 of the inner chute 23 and the highest portion of the rotation locus of the rotor 8 is about 1/10 or less of the diameter of the rotor 8 or the diameter of the opening 25 of the raw material supply port 9. It is preferably 1/20 or less, and the most preferable mode is about 1/40 to 1/60. It is desirable that the specific distance be close to about 10 mm.

The direction of the opening 25 of the inner chute 23 is open toward the winding direction C of the rotor of the rotary feeder 2. The opening ratio of the opening 25 toward the winding direction side C is 80% or more, and preferably 90% or more. In the aspect of the present embodiment, all the openings 25 of the inner chute 23 are opened at a position closer to the winding direction side C of the rotor 8 than the center line of the rotary feeder 2.

Another difference between this embodiment and the prior art is the mounting angle of the ventilation pipes 27 and 28. In the present embodiment, the rising portions and the horizontal drawing portions of the ventilation pipes 27 and 28 are at an angle at which the once sucked raw material can be discharged while the pneumatic conveying device 20 is at rest, that is, at a repose angle of the raw material or more. There is a gradient of. This angle F is about 3 when vinyl chloride is used as the raw material to be transported.
It is 5 °.

In the pneumatic transportation device 20 of this embodiment,
The raw material is dropped into the raw material supply port 9 of the rotary feeder 2 through the inner chute 23 as in the conventional technique.
However, the opening 25 of the inner chute 23 is entirely opened at a position C on the winding direction side of the rotor 8 with respect to the center line of the rotary feeder 2, and the drop between the opening 25 of the inner chute 23 and the rotor 8 is extremely small. Therefore, the dropped raw material 29 is dropped only on the winding direction side C of the rotor 8 and does not spread so much. Therefore, the compressed air blown into the extraction chamber 21 through the return side D of the rotor 8 hardly contacts the raw material 29. Therefore, in the extraction chamber 21, the raw material 29
Is rarely blown up. Then, the compressed air blown into the bleeding chamber 21 passes through the bleeding chamber 21 and is discharged to the outside from the ventilation pipe 27 as it is.

The raw material which has been blown up by the compressed air and has been sucked into the ventilation pipe 27 when something abnormal occurs is blown out of the compressed air when the pneumatic conveying device 20 of this embodiment stops working. When it stops, it slides in the ventilation pipe 27 or rolls back into the extraction chamber 21.

[0026]

In the pneumatic conveying apparatus of the present invention, the inner chute is eccentrically constricted at its tip and most of the inner chute is open from the center of the rotor to the winding side. Since the tip of the is protruded from the lower end of the chamber and inserted into the feed port of the rotary feeder, the package is mainly dropped from the center of the rotor to the part on the winding side and does not spread. Therefore, in the pneumatic feeding device of the present invention, it is less likely that the transported object is blown up by the pressurized air that has passed through the rotary feeder. As a result, in the pneumatic feeding type transport device of the present invention, the raw material is not excessively accumulated in the extraction chamber, and the raw material is not blocked by the ventilation pipe to change the falling amount of the raw material. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is an overall view of a pneumatic transportation device according to a specific embodiment of the present invention.

FIG. 2 is a cross-sectional view of main parts of a pneumatic feeding type transportation device in a specific example of the present invention.

FIG. 3 is a cross-sectional view of an essential part showing the behavior of the raw material in the part shown in FIG.

FIG. 4 is an overall view showing a configuration of a conventional pneumatically-powered transportation device.

FIG. 5 is a cross-sectional view of a main part of a conventional pneumatic transportation device.

[Explanation of symbols]

 2 Rotary feeder 3 Transport pipe 8 Rotor 9 Raw material supply port 20 Pneumatic feeding type transport device 21 Bleed chamber 23 Inner chute 25 Opening

Claims (1)

[Claims] 1. A supply port and a discharge port of the rotary feeder, which has a chamber containing an inner chute for dropping a transported object, a rotary feeder in which a rotor is arranged in a casing, and a transport pipe through which pressurized air flows. Are connected to the lower end of the chamber and the transport pipe, respectively, and in a pneumatic feed type transporting device that conveys the transported goods discharged from the rotary feeder by compressed air, the tip of the inner chute projects from the lower end of the chamber to supply the rotary feeder. An pneumatic conveying device characterized in that it is inserted into the mouth, the tip of the inner chute is eccentrically constricted, and most of it is open from the center of the rotor to the part on the winding side.