JP2005334894A - Fluidized substance delivery method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for replenishing fluidized substance while keeping a supplying tank in a pressurized state, regarding a technique for delivering the fluidized substance in a tank by air-pressurization. <P>SOLUTION: A fluidized substance delivery method and an apparatus therefor is characterized in that a storing tank 3 communicated with the supplying tank 1 through two piping 7, 9 is provided, and after closing two piping 7, 9, the fluidized substance b is replenished into the storing tank 3, then the storing tank 3 is pressurized by air and thereafter, the fluidized substance b is shifted into the supplying tank 1 from the storing tank 3 by opening the piping 9, and thus the fluidized substance b is replenished into the supplying tank 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for delivering a fluid. More particularly, the present invention relates to a method and apparatus capable of replenishing a fluid while keeping the tank in a pressurized state in a technique for sending the fluid in the tank by air pressurization.

  There is a precision casting technique in which a molten metal is press-fitted into a mold and cooled and solidified to produce a cast product. In this technique, a core obtained by curing core sand is widely used to provide a space inside a cast product such as a machine part. For example, the use of a core is indispensable for forming an internal space of a cylinder using an aluminum alloy and a cooling medium passage inside the exhaust. The core is produced by blowing core sand together with air into a cavity of a molding die, and then bonding the core sand particles together with a binder and curing.

  The core sand is supplied to the molding die using, for example, an apparatus shown in FIG. In this apparatus, an inlet 22 is provided at the top of the supply tank 21, an intake duct 23 is provided on one side surface of the supply tank 21, an exhaust duct 24 is provided on the other side surface, and a core making machine a is provided at the bottom. Is connected to the delivery line 25. The core sand b introduced into the supply tank 21 from the inlet 22 is pressurized by the air introduced from the intake duct 23 and blown into the core manufacturing machine a through the delivery line 25 together with the air. . Excess air that is not used for sending the core sand b is discharged from the exhaust duct 24 to the outside of the supply tank 21.

As described above, in the technique for filling the molding die with core sand by blowing in air, for example, the pressure in the cavity of the molding die is reduced to 100 Torr or less, and 10 Kgf per second in the magazine containing the core sand. Compressed air is supplied at a pressure increase rate of / cm ² or less to increase the pressure in the magazine to 0.5 to 5.0 Kgf / cm ² , and the cavity and the magazine communicate with each other in a time of 0.2 seconds or less. A method is known (for example, refer to Patent Document 1). In this method, the core sand can be uniformly and densely filled to the details of the cavity by the combined action of the suction action in the cavity and the compressed air expansion action in the magazine.
JP-A-8-281376

  Incidentally, the core sand supply apparatus as shown in FIG. 2 has several problems. The first problem is that when the core sand b in the supply tank 21 runs out, the pressure in the supply tank 21 must be released to replenish the supply tank 21 with the core sand b. Therefore, every time the core sand b is replenished to the supply tank 21, the delivery of the core sand b to the core making machine a is interrupted, and it takes a considerable time to repressurize the supply tank 21, The core production machine a could not be operated continuously, and the core production efficiency was low.

  A further problem is that water vapor in the air aggregates due to repeated pressurization and release of the supply tank 21, and water accumulates in the supply tank 21. This water not only deteriorates the quality of the core sand in the supply tank 21, but also when the water is sent to the core making machine a together with the core sand b, it may adversely affect the core production. There is also.

The present invention has been made in order to solve the above-described problems, and in the technology for sending the fluid in the tank by air pressurization, the supply tank is kept in a pressurized state and the delivery of the fluid is interrupted. It is an object of the present invention to provide a method and an apparatus that can replenish the fluid to the supply tank without causing water generated by the condensation of water vapor in the supply tank to affect the quality of the fluid.

  As a result of diligent research, the present inventors have provided a storage tank that communicates with the supply tank in addition to the supply tank, and kept the supply tank in a pressurized state with air at all times, When replenishing the fluid, the supply tank and the storage tank are pressure-insulated, then the storage tank pressure is released and the fluid is replenished. It was found that the above problem can be solved by replenishing the fluid.

Therefore, the present invention
A fluid delivery method for delivering fluid in a supply tank by air pressurization,
A storage tank communicating with the supply tank by two pipe lines is provided,
After the two pipe lines are closed, the storage tank is replenished with fluid, then the storage tank is pressurized with air, then the pipe is opened and the fluid is transferred from the storage tank into the supply tank to the supply tank. The present invention relates to a fluid delivery method characterized by replenishing fluid.

The present invention also provides
A fluid delivery device for delivering fluid in a supply tank by air pressurization,
A supply tank with an intake duct for introducing air and a delivery line for delivering fluid;
A storage tank having an inlet for replenishing fluid, an exhaust duct for discharging air, and a drain for discharging the liquid in the tank;
The present invention relates to a fluid delivery device characterized by comprising an openable / closable first conduit and a second conduit communicating with the supply tank and the storage tank.

  According to the present invention, the supply tank can be kept in a pressurized state at all times. Therefore, when supplying the fluid to the supply tank, it is not necessary to interrupt the delivery of the fluid. Further, since pressurization and release are not performed in the supply tank, water aggregation does not occur in the supply tank.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view illustrating an embodiment of the fluid delivery device of the present invention.

  The fluid delivery device of the present invention in the form shown in the figure is for delivering the core sand b to the core making machine a, and includes a supply tank 1 and a storage tank 3 provided above the supply tank 1. including. Here, the supply tank 1 is a tank for sending fluid in the tank by pressurization with air, and has an intake duct 2 for introducing air for pressurizing the tank and sending core sand. Prepare.

  On the other hand, the storage tank 3 is a tank for temporarily storing the fluid to be sent out from the supply tank 1, and has an inlet 4 for replenishing the fluid into the tank and discharges air from the tank. An exhaust duct 5 for discharging the liquid and a drain 6 for discharging the liquid in the tank.

The supply tank 1 and the storage tank 3 are communicated with each other by a first pipeline 7 and a second pipeline 9 provided with valves 8 and 10, respectively. The first pipeline 7 is connected to the top of the supply tank 1 and the bottom of the storage tank 3 and is used to transfer the core sand b in the storage tank 3 into the supply tank 1. On the other hand, the second pipeline 9 is connected to the upper side surface of the supply tank 1 and the upper side surface of the storage tank 3, and the air introduced into the supply tank 1 is further guided to the storage tank 3, the same as in the supply tank 1. Used to pressurize the storage tank 3 to pressure.

  Further, the supply tank 1 is connected to the delivery line 11 at the bottom thereof, and the delivery line 11 is led to the core manufacturing machine a. The core sand b is sent to the core making machine a together with the air introduced into the supply tank 1 through the delivery pipe 11.

  In the fluid delivery device of the present invention of the illustrated embodiment, when a sufficient amount of core sand b is accommodated in the supply tank 1, the air in the supply tank 1 is caused by the air introduced from the intake duct 2. The core sand b is sent to the core manufacturing machine a through the delivery pipe 11.

  When the core sand b in the supply tank 1 becomes insufficient with the delivery of the core sand b, the valves 8 and 10 are closed, and the supply tank 1 and the storage tank 3 are pressure-insulated. In this state, air is discharged from the exhaust duct 5 to release only the pressure of the storage tank 3, and after releasing the pressure, the input port 4 is opened, and a required amount of core sand b is input into the storage tank 3. When the charging of the core sand b is completed, the charging port 4 is closed and the storage tank 3 is again airtight. Thereafter, when the valve 10 is opened, the air in the supply tank 1 flows into the storage tank 3 and the storage tank 3 is pressurized. This pressurization is performed until the pressure in both tanks becomes equal because the supply tank 1 and the storage tank 3 are communicated with each other by the second pipe 9. And after making both tanks into equal pressure, the valve 8 is opened and the core sand b is transferred from the storage tank 3 to the supply tank 1 through the first pipe 7. In the apparatus of the illustrated embodiment, since the storage tank 3 is provided above the supply tank 1, the core sand b naturally falls into the supply tank 1 by opening the valve 8. In this way, the core sand b is supplied into the supply tank 1.

  During such a replenishment operation, the supply tank 1 is pressure-insulated from the storage tank 3, so that it is always kept in a pressurized state. And the delivery of the core sand b is continued without interruption.

  By the way, in the storage tank 3, since pressurization and release at the time of charging the core sand b are repeated, water may accumulate in the tank due to aggregation of water vapor in the air. However, by discharging this water from the drain 6 provided in the storage tank 3 before transferring the core sand b to the supply tank 1, it is possible to prevent water from entering the supply tank 1, The quality of the core sand b is not deteriorated, and water is not sent to the core manufacturing machine b together with the core sand b.

  In the apparatus of the illustrated embodiment, pressurization of the supply tank 1 and the storage tank 3 is performed by the intake duct 2 connected only to the supply tank 1, but the storage tank 3 is further provided with an intake duct. Direct pressure can be applied. In this case, care should be taken so that the pressures in the supply tank 1 and the storage tank 3 become equal so that the backflow of the core sand b does not occur. Further, an exhaust duct can be further provided in the supply tank 1 for the purpose of releasing excess air while the valves 8 and 10 are closed.

  The device of the illustrated embodiment is a core sand delivery device, but the technique of the present invention can be applied to the case of sending a fluid by pressurization with air, as with the core sand. This includes the delivery of core sand to sand regenerators, sand kneaders, etc., and the delivery of fluids to vacuum kneaders.

FIG. 1 is a schematic view illustrating an embodiment of the fluid delivery device of the present invention. FIG. 2 is a schematic view illustrating one aspect of a prior art fluid delivery device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supply tank 2 Intake duct 3 Storage tank 4 Sand inlet 5 Exhaust duct 6 Drain 7 First pipe 8 Valve 9 Second pipe 10 Valve 11 Delivery pipe a Core manufacturing machine b Core sand

Claims (2)

A fluid delivery method for delivering fluid in a supply tank by air pressurization,
A storage tank communicating with the supply tank by two pipe lines is provided,
After the two pipe lines are closed, the storage tank is replenished with fluid, then the storage tank is pressurized with air, then the pipe is opened and the fluid is transferred from the storage tank into the supply tank to the supply tank. A fluid delivery method comprising replenishing a fluid. A fluid delivery device for delivering fluid in a supply tank by air pressurization,
A supply tank with an intake duct for introducing air and a delivery line for delivering fluid;
A storage tank having an inlet for replenishing fluid, an exhaust duct for discharging air, and a drain for discharging the liquid in the tank;
A fluid delivery device comprising: an openable / closable first conduit and a second conduit communicating with the supply tank and the storage tank.

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