JPH0977255A - Pneumatic transportation device of compressible powder and granular material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of pneumatic transportation without generating clogging of a transfer tube by employing the constitution in which the mixing ratio of the compressible powder and granular material to the compressed gas for transportation is kept constant by a compact equipment. SOLUTION: In a pneumatic transportation device of the compressible powder and granular material, a powder and granular material feeding cylinder 8 to which a screw type feeding blade 10 is added is inserted in a long mixing cylinder 2 to blow and feed the compressed gas through a filter 3 in a communicated manner, a powder and granular material hopper 12 is provided on an upper part of the feeding cylinder 8 in a communicated manner, and a check valve lid 16 is provided on the tip of the feeding cylinder 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic transportation device for powdery granules such as molding sand for molding raw molds.

[0002]

2. Description of the Related Art Conventionally, pneumatic transportation of a powdery or granular material having a compressibility and a sticking property, such as a molding sand for green molding, causes a transport pipe to be blocked by the powdery or granular material. The reason is that firstly, the mixing ratio of the granular material to be transported and the compressed gas for transportation is changed, and secondly, intermittent transportation is performed by a pressure tank for pressure feeding. It becomes stagnant and further compressed to cause blockage. In order to prevent or release this blockage, many secondary air supply structures should be installed to the transport pipe at intervals of about 1 m, or a vibration exciter should be installed at each place where blockage is predicted. I am dealing with it.

[0003]

As described above, in order to install a large number of secondary air supply mechanisms for a transport pipe or to equip a vibration exciter, the equipment becomes complicated and large, and the equipment cost increases, and the air cost increases. Since a large pressure tank is used for transportation, there is a problem that energy consumption by supply and exhaust increases. The present invention has been made in view of the above problems, and is a high-performance air that does not cause clogging of the transportation pipe by making it possible to always keep the mixing ratio of the granular material and the compressed gas for transportation by a compact facility. It is intended to provide a transportation device.

[0004]

In order to achieve the above-mentioned object, an air transporting apparatus for a granular material having a compressibility according to the present invention has an upper end portion communicating with a transport pipe and a compressed gas for transporting from the bottom portion. A vertically-long mixing cylinder configured to be blown up and supplied through a filter, a powder / granular material supply cylinder penetrating inward from a side portion of the vertically-long mixing cylinder, and arranged in the supply cylinder. A screw-type feed blade that is driven to rotate, a powder hopper that is arranged in communication with the upper part of the supply cylinder, and a check valve that is arranged at the tip of the supply cylinder protruding into the vertically long mixing cylinder. It is characterized by comprising a lid.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. A ventilation filter 3 is attached to the lower end of the vertically-long mixing cylinder 2 whose tip communicates with the transport pipe 1, with its lower end closed, and a lid cover 4 surrounds the filter-3. , And constitutes and is attached to the air chamber 5. The air chamber 5 communicates with a compressed gas supply source (not shown) through a supply port 6, and a gas dispersion plate 7 is disposed above the supply port 6 in the air chamber 5 correspondingly. . A powder supply cylinder 8 is inserted through the side of the vertical mixing cylinder 2 with the tip of the powder supply cylinder 8 protruding into the mixing cylinder 2, and a bearing 9 is inserted in the supply cylinder 8. A screw-type feed blade 10 rotatably supported is arranged, and its base end is connected to an electric motor 11.

Further, a powdery or granular material hopper 12 is provided in communication with the upper part of the supply cylinder 8, and the powdery or granular material hopper is provided.
An upper limit powder detector 13 and a lower limit powder detector 14 are attached to the upper and lower positions of 12. Above the powder hopper-12, both powder detectors 13,
Belt conveyor 15 driven and controlled by the command of 14
Is arranged with its tip facing. In addition, the tip of the supply cylinder 8 (the end protruding into the vertically-long mixing cylinder 2) is pushed open by pushing out the granular material from the inside of the supply cylinder 8, and the tip of the supply cylinder 8 is always closed by its own weight. The check valve lid 16 that acts on is rotatably suspended. In the figure, S is foundry sand.

In such a structure, the supply valve (not shown) is opened in the state of FIG. 1, the compressed gas is introduced from the supply port 6 into the air chamber 5, and is diffused by the gas dispersion plate 7,
It is supplied into the vertically long mixing cylinder 2 via the filter-3, rises, and is supplied to the transport pipe 1. With a slight time lag from this action, the electric motor 11 is driven to rotate the screw-type feed blade 10 to continuously push out the molding sand S in the supply cylinder 8 to the tip portion, whereby the check valve lid. The molding sand 16 is pushed open to continuously supply the molding sand S in the vertical mixing cylinder 2 in a fixed amount, continuously mixed in the rising compressed gas to ascend, and is pneumatically transported to the intended place through the transportation pipe 1. On the other hand, powder hopper 12
When the foundry sand S in the inside decreases and falls below the lower limit powder detector 14, the belt conveyor 15 is driven to replenish the foundry sand S, and when the upper limit powder detector 13 is reached, the belt conveyor 15 is driven. Be stopped. By performing the above operation, the foundry sand S can be transported without blocking the inside of the transport pipe 1 since the mixing ratio with the compressed gas is always constant and is continuously transported. In the above embodiment, the molding sand is described as an example of the shrinkable powder, but the present invention is not limited to this, and most of the wet industrial powder can be pneumatically transported in the same manner. It is possible.

[0008]

As is apparent from the above description, the present invention communicates and inserts a powdery or granular material supply cylinder provided with a screw type feed blade to a vertically elongated mixing cylinder configured to blow and supply compressed gas. In this way, the powder and granules are continuously fed in a fixed amount, and the mixture ratio of the powder and granules to the compressed gas is always kept constant, and the powder can be transported continuously. -It is possible to pneumatically transport without blocking the transport pipe without using a supply configuration, etc., and there is an effect that equipment cost and energy consumption can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part showing an embodiment of the present invention.

[Explanation of symbols]

 1 Transport Pipe 2 Vertical Mixing Cylinder 3 Filter-5 Air Chamber 8 Supply Cylinder 10 Screw Type Feeding Blade 11 Electric Motor 12 Powder Granule Hopper-16 Check Valve Cover S Cast Sand

Claims (1)

[Claims] 1. A vertically long mixing cylinder 2 having an upper end communicating with a transportation pipe 1 and a compressed gas for transportation being blown up and supplied from a bottom through a filter-3, and the vertically long mixing cylinder 2.
A supply tube 8 for the granular material, which is arranged so as to penetrate from the side of the container to the inside.
In the supply cylinder 8, a screw type feed blade 10 which is arranged in the supply cylinder 8 and is driven to rotate, a powdery or granular material hopper 12 which penetrates the upper part of the supply cylinder 8 and is provided. Check valve lid 16 arranged at the tip protruding into the vertically long mixing cylinder 2
And a pneumatically transporting device for a powdery or granular material having compressibility, comprising: