JPS60222137A - Process and device for pneumatic transportation to vacuum melting tank - Google Patents

Abstract

PURPOSE:To automate pneumatic charge of material to be melted completely by providing a double valve means for holding air-tightness consisting of a protecting valve and a stop valve to an opening part of a vacuum melting tank in series and communicating the valve means to an end of a transporting pipe of a blow tank. CONSTITUTION:A protecting valve 9 having a conical valve body 7 attached freely fittably and separably to/from a bottom end of a charging pipe 8 is provided to a top end of a working rod 6 of a cylinder 5 at an opening part of a cover 4 of the melting tank 2 in a pneumatic transportation device with a transportation pipe between a blow tank and a vacuum melting tank. A double valve means for holding air-tightness is also provided interposing a stop valve 11 between the top end of an introducing pipe 10 extending sideward from the charging pipe 8 and the terminal end of the transportation pipe 3. As the result, complete automatic pneumatic transportation is realized for stages from the charge of raw material to the discharge of the soln. even for a particulate matter having intense adhesive property or solubility by closing the melting tank 2 completely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes a vacuum system for heating and melting powder and granules with strong adhesion and solubility in a vacuum state. A double airtight maintenance valve consisting of a valve and a closing valve above it is integrally connected in series, and the melted raw material is transported by air into the melting tank filled with solvent, and during vacuum and heating. This invention relates to a method and apparatus for pneumatic transport to a vacuum and heating melting tank, which corrects the various disadvantages that occur in the process and completely automates the introduction of melting raw materials by pneumatic transport.

When heating and melting gelatin, etc., which have traditionally had strong adhesion and solubility, or when melting granular synthetic resin in a vacuum to remove air bubbles and make it into a product, the powder is used. When granules are placed in a vacuum or heated dissolution tank, a certain amount of water or other solvent is poured into the tank, the fc ridge cover is opened, and the bag is artificially broken up. However, this method is extremely inefficient as it requires the operator to unpack each bag individually and then load it by hanging.Moreover, since the melting tank is heated, if there is steam when loading the bag, it may stick and dissolve. When it is a powdery material with strong properties, it has disadvantages such as adhesion to other materials, and also has the disadvantage of creating a poor working environment. For this reason, in recent years, various methods have been attempted for directly transporting powder and granular materials having properties that are inconvenient to handle by pneumatic transport to a dissolving tank without the intervention of manual operations. However, according to this pneumatic transportation method, the tip of the transport pipe is connected directly to the dissolution tank and an airtight valve is attached to it, so when the raw material is poured into the dissolution tank, the powder particles are scattered by the solvent poured into the dissolution tank. The solvent may adhere to the airtight valve or the back of the lid, enter the air vent pipe that opens on the tank wall, and furthermore, the airtight valve may become wet due to airtight leakage and steam generated during vacuum or heating. This has a number of disadvantages, such as particles adhering to the surface.

The present invention was created with the aim of correcting these disadvantages and completely automating the introduction of melted raw materials by pneumatic transportation. A conical protection valve is installed at the top of the conical protection valve, and a closing valve is interposed between the upper part and the terminal end of the transport pipe, and these double airtight maintenance valves ensure that the conical protection valve does not close when melting raw materials are introduced. Since the conical surface diffuses and injects the dissolved raw material not perpendicularly to the solvent surface but at an oblique angle, there is no scattering of the dissolved raw material and solvent, and these double airtight maintenance valves are used during vacuum and heating. Among these, the retaining valve with a conical valve body has a self-cleaning function and maintains airtightness, and this also moistens the shut-off valve and prevents particles from adhering to it.The simple structure saves labor. This is extremely useful for achieving optimization and rationalization. To explain this with an embodiment of the present invention, a transport pipe (3
), a conical valve body is attached to the tip of the operating frame (6) of the cylinder (5) at the opening of the cover (4) of the vacuum/heat melting tank (2). (7) attaches a releasable protection valve (9) to the lower end of the input pipe (8), and an introduction pipe (1) extending to the side of the input pipe (8).
A blockage valve (11
) are interposed to form a double airtight maintenance valve, in which (12) is the air supply pipe, (13) is the intake pipe, and (14) is the airtight maintenance valve.
) is the solvent introduction tube, (15) is the nozzle, (16) is the vacuum generator, (17) is the electric motor, (18) is the vacuum pressure gauge, (
19) is a bag filter, (20) is a gate valve, (2
1) is a stirring blade, (22) is a heating section, and (23) is a solution discharge pipe.

The present invention has an inclined configuration, in which the conical valve body (7) which can be freely separated from the lower end of the input pipe (8) of the protection valve (9) has a conical inclined surface. Since it is attached to the tip of the actuating rod (6) so as to be in close contact with the lower end surface of the valve body (8), the lower end surface of the input pipe (8) is also attached to this valve body (7).
), similar to the sloped surface of ), is cut to increase the degree of adhesion. To explain the process of transporting powder and granules with strong adhesion and solubility, first, a certain amount of powder and granules are put into the blow tank (1), and at the same time, water etc. are poured into the vacuum and heating melting tank (2). After injecting the solvent through the solvent introduction pipe (14), open the protection valve (9) and open the blockage valve (11) to start pneumatic transport, and the powder and granules in the tank (1) will be transported one by one. The powder passes through the tube (3) and is charged into the vacuum and heated melting tank (2). The conical valve body (
7) Since the particles are diffused in all directions υ from the inclined surface and are injected into the solvent surface at an angle, there is less scattering of the powder and granules when they are introduced. This allows accurate injection without adhesion or intrusion into the inside of the solvent introduction tube (15).For subsequent vacuum and heating melting, first close the closing valve (11), then close the vacuum machine (1
6) to direct the air in the dissolution tank (2) to the intake pipe (
13) When the desired degree of vacuum is reached, the protection valve (9) is removed.
) during the heating and melting process. Steam is generated during this heating and melting process, and this steam flows through the conical valve body (7) of the protection valve (9) and the input pipe (8). Since it is in closer contact with the lower end, there is no need to worry about it penetrating into the blockage valve (11) and making it wet, so that the next time air transportation is carried out, powder or granules will adhere to this blockage valve (11) and prevent airtightness. A stirrer blade that eliminates leakage and maintains a constant vacuum state (
21) After stirring and dissolving the mixture, the vacuum is released and the solution is discharged from the discharge pipe (23), thereby completing the series of processes for making kernels. Thereafter, the same vacuum and heating melting process is repeated, but at this time, even if the valve body (9) of the holding valve (9)
Even if the container 7) is wet due to the previous steam, it will be self-cleaned by the next shipment and its airtight efficiency will remain unchanged.

In the present invention, by attaching a double airtight maintenance valve to the cover (3) of the vacuum and heating melting tank (2), the melting tank can be completely closed even when powder particles with strong adhesion and solubility are present. By sealing it, it is possible to completely automate the process from inputting raw materials to taking out the solution using the pneumatic transportation method.
), even a heating melting tank can exhibit the same effect, drastically improving the working environment, and is extremely useful as it contributes to labor saving and rationalization.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway schematic diagram showing one embodiment of the present invention, and FIG.
The figure is an enlarged sectional view of the main part.

Claims (2)

[Claims] (1) In a pneumatic transport device that connects a transport pipe between a plow tank and a vacuum or heating melting tank, a double airtight maintenance valve consisting of a protection valve and a blocking valve is installed in series at the opening of the vacuum or heating melting tank. A method for pneumatic transport to a vacuum and heating melting tank, characterized in that it is arranged and connected to the end of a transport pipe. (2) In a pneumatic transport device in which a transport pipe is installed between a blow tank and a vacuum or heating melting tank, a conical pipe is attached to the tip of the operating frame of the cylinder at the opening in the cover of the vacuum or heating melting tank. A protection valve with a shaped valve body attached to the lower end of the input pipe that can be freely separated, and a blockage valve interposed between the upper end of the introduction pipe extending laterally of the input pipe and the terminal end of the transport pipe. A pneumatic conveyance device to a vacuum and heating melting tank characterized by having a double airtight maintenance valve.