JP2001278448A - Powder body constant flow feeder for pneumatic transportation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the movement of a powder body and to stably and highly precisely feed the powder body with a low powder bulk density by suppressing an air leak of a pneumatic transportation pipe to small and reducing rat hole and flushing phenomena. SOLUTION: A lower supply port 1a of a hopper 1 is positioned inside a casing 2 of this powder body constant flow feeder and a powder body supply device 3 is attached to the lower supply port 1a. The powder body supply device 3 is formed of an upper seal plate 3a having three communication ports 3a1, a seal rotor 3c, and a lower seal plate 3b having three communication ports 3b1. The seal rotor 3c is rotationally moved by a motor 9, a supply board 5 provided in the inner bottom face of the casing 2 and forwarding the powder body to the casing outside is rotationally moved by a motor 8, and the powder body is discharged in a position outside the casing of the supply board 5 inside the pneumatic transportation pipe 6. An air space 2f is provided upward inside the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder feeder for pneumatic transportation capable of quantitatively supplying powder in a hopper to a pneumatic transport pipe with high accuracy, and is affected by leak of transport air and air pressure. In particular, it is a technique capable of transporting a powder with a low bulk specific gravity with a high degree of accuracy by air.

[0002]

2. Description of the Related Art Conventionally, a powder for pneumatic transportation provided with a quantitative supply device for transferring a powder into a pneumatic transport pipe adjacent to a predetermined flow rate at a lower portion of a casing for temporarily storing the powder replenished from the hopper. Metering machines are widely used. As the fixed-quantity supply device, a supply plate having a plurality of blades provided radially on the outer periphery and a powder storage chamber provided between the blades is used. It is widely known that this is rotated at a predetermined number of revolutions, the powder is filled in the powder storage chamber between the blades in the casing, and the powder is circulated and discharged in the air transport pipe outside the casing. . Conventionally, in this type of quantitative supply device, air in the air transport pipe leaks through a gap between the rotary supply plate and the outer peripheral wall of the casing and an internal seal member, and air flows into the casing and further into the hopper. Leaks, rathole phenomena and flushing phenomena have occurred, powder movement has been destabilized, supply accuracy has been reduced, and eventually supply has become impossible. In particular, when the powder bulk specific gravity of the powder becomes low and the powder pressure becomes weak, the air pressure becomes stronger and the influence of this air leak increases. In order to avoid this problem, the sealing performance of the supply device has been improved. However, the sealing performance is limited due to the rotation of the rotary supply board and the need to consider the temperature expansion, and air leakage is limited. I couldn't help. In addition, the effect of air pressure can be reduced by enlarging the air transport pipe and increasing the diameter of the casing, but this has the problem that the equipment is enlarged and the equipment cost is increased.

[0003]

The problem to be solved by the present invention is to solve these problems of the prior art, to reduce the air leak of the air transport pipe, and to stabilize the powder even if the powder has a low specific gravity. An object of the present invention is to provide a powder quantitative feeder for pneumatic transportation capable of supplying with high precision.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above-mentioned problems is as follows: 1) A supply board for transferring powder in the casing to an external air transport pipe is provided below a casing for temporarily storing the granular material. A movable hopper is provided above the casing, and a powder hopper is stored above the casing. The powder in the hopper is supplied to the casing, and the supply plate is rotated to supply a predetermined amount of powder into the air transport pipe. In a pneumatic transportation powder metering device that is moved and pneumatically transported, a lower supply port of a hopper is located in a casing, and the lower supply port is sealed between two upper and lower seal plates with communication ports. A powder replenishing device in which a rotor is rotatably sealed is connected, a phase difference is provided so that the upper and lower communication ports of the seal plate do not overlap vertically, and the powder feed flow rate by the seal rotor of the powder replenishing device is supplied. It is the supply flow rate by the panel A powder feeder for pneumatic transportation characterized in that it is set to be large, a lower seal plate is closed with powder, and an air space is formed in the upper part of the casing. 2) Air in the upper part of the casing The powder quantitative supply device for pneumatic transportation according to the above item 1), further comprising: a pressure equalizing pipe communicating the space with the pneumatic transport pipe.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The rotation of a seal rotor and a supply plate according to the present invention is usually driven by a motor so that the flow rate of powder rotated by the rotation of the seal rotor is slightly larger than the supply amount by the supply plate. Set with the controller. The supply board of the present invention can be provided not only at one place but also at a plurality of places in one casing. In this case, the powder flow rate of the seal rotor is set to be larger than the total supply amount of the operating supply board. The powder flow rate of the seal rotor is a powder flow rate when the powder is filled from the hopper into the powder storage chamber between the blades of the seal rotor, and the whole quantity is rotated and discharged into the casing as it is. , The amount of the charged powder multiplied by the rotation speed. A typical structure of the supply plate of the present invention is fitted into a concave portion near the outer periphery of the bottom surface of the casing, has blades on the outer periphery of the disk, and serves as a powder accommodating chamber between the blades. A considerable portion is provided with a lid plate that becomes a sliding plate except for the opening that becomes the filling port, and the outside of the casing is closed with a lid plate above the powder storage chamber except for the passage space of the air transport pipe. It is.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the embodiment. FIG. 2 is an explanatory diagram of the embodiment viewed from a plane. FIG. 3 is an exploded perspective view of the powder supply device of the embodiment. In the figure, A is a powder feeder for pneumatic transportation of the embodiment, 1 is a hopper, 1a is a hopper 1
2 is a casing, 2a is a casing bottom plate, 2b is a casing side face, 2c is a casing canopy,
d is an accommodation chamber for accommodating the powder supply device 3 in the casing,
Reference numeral 2e denotes a support cylinder formed at the center of a casing canopy 2c forming the storage chamber, 2f denotes an upper air space in the casing 2, 2g denotes a concave portion of the casing bottom plate 2a into which the supply plate 5 is fitted, and 3 denotes powder. Refilling device, 3a is an upper seal plate, 3a
Reference numeral 1 denotes three communication ports provided in the upper seal plate, reference numeral 3a2 denotes a mounting hole, reference numeral 3b denotes a lower seal plate, and reference numeral 3b1 denotes three communication ports provided in the lower seal plate. Has a phase difference of 60 °. 3c is a seal rotor, 3c
Reference numeral 1 denotes an outer peripheral blade of the seal rotor, 3c2 denotes a rotary shaft of the seal rotor, 3c3 denotes a stirring blade mounted above the upper seal plate 3a of the rotary shaft, and 4 denotes a casing mounted below the rotary shaft 3c2. 5 is a supply board, 5a is a blade provided on the outer periphery of the supply board, 5b is a powder filling space formed between the blades, 5c is a rotating shaft of the supply board 5, and 5d is an inside of the casing 2. The sliding plate, which has a large opening, has an air passage opening 5e,
6 is an air transport pipe, 7 is a pressure equalizing pipe communicating the air space 2e of the casing 2 with the air transport pipe 6, 8 is a motor drive unit that rotates the rotating shaft 3c2, and 9 is a rotating shaft 5c of the supply panel 5. The moving motor 10 is a controller for controlling the rotation speed of the motors 8 and 9 and opening and closing the power supply. In this embodiment, the powder in the hopper 1 is sent from the lower supply port 1a to the powder supply device 3. The powder in the lower supply port 1a is stirred by the stirring blades 3c3, and the powder in the upper seal plate 3a
After flowing down from the two communication ports 3a1 into the powder accommodating space between the blades 3c1 of the seal rotor 3c, it is rotated and transported by the rotation of the seal rotor 3c, and when rotated about 60 °, flows from the communication port 3b1 of the lower seal plate 3b to the casing 2 Run down.
The powder in the casing 2 flows down to the powder filling space 5b between the blades 5a in the supply plate 5 in the recess 2g while being agitated by the powder scraping blades 4. There is a sliding plate 5d on the upper surface of the supply plate 5, but the inside of the casing 2 is cut out to be in an open state, and the powder is filled in the powder filling space 5b which has been emptied and returned, When the powder is sent out of the casing 2, it is slid off by the slicing plate 5d, and the amount of powder in the powder filling space 5b becomes constant. And is pneumatically transported. The supply amount can be adjusted by changing the rotation of the supply board 5 by the controller 10. In this embodiment, the rotation speeds of the motors 8 and 9 are controlled by the controller 10 so that the powder supply flow rate of the powder supply device 3 is larger than the powder supply amount of the supply board 5. Therefore, the powder in the casing 2 accumulates by the difference in the flow rate, and the powder level rises. When the powder level becomes higher than the lower seal plate 3b of the powder replenishing device 3, the communication port 3b1 of the lower seal plate 3b is closed with the powder, and even if the seal rotor 3c of the powder replenishing device 3 rotates. The powder filled in the space between the blades 3c1 becomes difficult to fall due to the powder in the casing 2 that closes the communication port 3b1, and the supply from the powder supply device 3 decreases or stops. When stopped, the amount of powder supplied from the supply board 5 increases, so that the powder level decreases. When the amount of the powder is reduced below the lower seal plate 3b, the supply of powder from the powder supply device 3 increases again. In this way, the powder level in the casing is balanced at a level slightly higher than the height of the lower seal plate 3b. As a result, the powder pressure in the hopper 1 is reduced by the blades 3c1 of the seal rotor 3c of the powder supply device 3.
And the upper and lower seal plates 3a and 3b temporarily block the high powder pressure in the hopper 1 from acting directly on the powder in the casing 2, and the powder in the hopper 1 and the powder in the casing 2 The powder seal prevents the air flowing from the seal leak of the supply board 5 from flowing into the hopper 1 via the powder replenishing device 3 by being continuous. Further, the air in the casing 2 moves to the air space 2f above the casing 2,
Prevents excessive rise in air pressure. In the powder supply device 3, the blade 3c1 of the seal rotor 3c and the upper seal plate 3
a communication port 3a1 and the communication port 3b1 of the lower seal plate 3b.
The 60 ° phase difference with the above provides a high air passage resistance and enhances the sealing effect. As described above, since the air leak from the air transport pipe 6 does not reach the hopper, the flushing phenomenon does not occur, and stable quantitative supply can be performed. Further, when the pressure equalizing pipe is provided, the air pressure of the air space 2f in the casing 2 and the air pressure of the air transport pipe 6 are made the same, thereby preventing the rathole phenomenon and the flushing phenomenon due to the increase in the air pressure in the casing.

[0007]

As described above, according to the present invention, the powder replenishing device for feeding the hopper powder into the casing at a predetermined flow rate is provided inside the casing having the supply plate, and the flow rate fed by the powder replenishing device is supplied. By setting the supply amount to be greater than the amount supplied by the panel, the powder level in the casing is buried in the powder communication port of the powder replenishing device and the air leak to the hopper is reliably shut off with the powder. In addition, the occurrence of rat hole phenomena and flushing phenomena caused by leaked air is reduced, thereby enabling stable high-precision limited supply. If an equalizing tube is provided, the influence of the air can be further reduced when there is a large amount of leaked air.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment.

FIG. 2 is an explanatory diagram of the embodiment viewed from a plane.

FIG. 3 is an exploded perspective view of the powder supply device of the embodiment.

[Description of Signs] A Powder quantitative feeder for pneumatic transport 1 Hopper 1a Lower supply port 2 Casing 2a Casing bottom plate 2b Casing side 2c Casing canopy 2d Storage chamber 2e Support cylinder 2f Air space 2g Depression 3 Powder replenishing device 3a Upper seal plate 3a1 Communication port 3b Lower seal plate 3b1 Communication port 3c Seal rotor 3c1 Blade 3c2 Rotating shaft 3c3 Stirrer blade 4 Powder raking blade 5 Supply board 5a Blade 5b Powder filling space 5c Rotating shaft 5d Slide cutting plate 5e Mouth 6 Pneumatic transport pipe 7 Equalizing pipe 8, 9 Motor 10 Controller

Claims (2)

[Claims] 1. A hopper for rotatably providing a supply plate for transferring powder in a casing to an external pneumatic transport pipe at a lower portion of a casing for temporarily storing powder and granules, and storing the powder and granules above the casing. The powder in the hopper is supplied into the casing, and the supply plate is rotated to move the powder at a predetermined flow rate into the air transport pipe for pneumatic transport so that the powder is supplied. , The lower supply port of the hopper is located in the casing, and the lower supply port is provided with a powder supply device in which a seal rotor is rotatably sealed between two upper and lower communication ported seal plates, A phase difference is provided so that the upper and lower communication ports of the seal plate do not overlap vertically, and the powder feed flow rate by the seal rotor of the powder replenishing device is set to be larger than the flow rate supplied by the supply plate. Occluded by the body and An air transportation powder metering and feeding machine characterized in that an air space is formed in an upper part in a casing. 2. The powder metering and feeding machine for pneumatic transportation according to claim 1, further comprising a pressure equalizing pipe which connects an upper air space in the casing with the pneumatic transportation pipe.