JPS58205533A - Sand supplying gate device for spray molding - Google Patents

Abstract

PURPOSE:To enable a continuous operation and to reduce the cost by balancing the internal pressure of sand supplying tanks having two sets of closed type gates and the internal pressure of a mixer, keeping the accuracy of measurement of sand in the tanks and supplying said sand to the mixer continuously. CONSTITUTION:A pressurizing circuit that balances the internal pressure of sand supplying tanks 16, 16a having two sets of closed type gates 17, 18 and the internal pressure of a mixer 14 is provided, and a pressure is applied by blowing air 19 to ensure the accuracy of measurement of tanks 16, 16a. While sand 21 is supplied from the tank 16 to the mixer 14, sand 21 is replenished from a stroage tank 15 to the tank 16a. This operation is repeated to enable continuous blending and spray molding. When the lower gate 18 is open, the upper gate 17 is in a closed state, and the lower gate is closed by an off-signal of a level switch 24. After confirmation of this closed state, the gate 17 becomes open and replenishes sand 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand supply gate device for spray molding that can be applied to a spray molding device, a pneumatic transport device, and the like.

As a conventional self-hardening sand blowing molding device, the device shown in Fig. 1 has been proposed.
Balance the internal pressure of 1) with the internal pressure of mixer (3) by installing a ventilated arm game (4'), then mixer (3).
In step 3), after adding the catalyst (1) and resin (5a) and kneading them under pressure, sand (co) is injected from the spray molding nozzle (6) through the rubber hose (7). There is. In the figure, Cg) is the input port, (9) is the bell gate, (1O) is the tank pressurizing solenoid valve, [//] is the level switch, (/2] is the motor, and (13) is the air.

However, in the apparatus shown in Fig. 1, the inside of the sand tank (1) needs to be pressurized to about o,s-t o kq/ctl+ during the molding operation, so if a large amount of air is consumed, , s Ntkg/c++t, it was necessary to have a sand tank structure with great strength.

In addition, since it is a batch method, molding operations cannot be performed while sand is being replenished, and in order to increase operation rates, it is necessary to shorten sand replenishment time.
For this reason, the capacity of the sand replenishing device had to be two to three times the spraying capacity. On the other hand, the amount of sand supplied from the ventilated arm gate tends to vary depending on the amount of sand in the sand tank, and even if the pressure inside the tank varies, the amount supplied tends to vary. Furthermore, in the case of continuous operation, a separate batch type sand replenishment device was required.The present invention was proposed in order to eliminate the above-mentioned drawbacks of the conventional method. Equipped with a pressurizing circuit that balances the internal pressure of the mixer with the internal pressure of the tank, the sand in the tank can be continuously supplied to the mixer while maintaining coulometric accuracy, allowing continuous work, reducing air consumption, and reducing costs. It is an object of the present invention to provide a sand supply gate device for spray molding that can measure down.

The embodiment of the present invention will be explained below with reference to the drawings. The second factor shows the embodiment of the present invention, in which there is a continuous mixer (a λ tank type buffer tank CIA between L and the sand storage tank (/!I)). (/Aa), and a closed upper gate (/7) and a lower gate (/ff) (tg) are attached to each buffer tank. Note that the lower gate (Ig) will be an interlocking type.

In addition, the buffer tank (/A) (/Aa) is pressurized at the same pressure as the internal pressure of the buffer tank (/A) (/A&) to ensure quantitative accuracy. In addition, (〃〃) is the gate cylinder,
(21) is sand, (λ, 2) is a pressurizing solenoid valve, (3) is a seal packing, (review) is a level switch, (Δ) is an interlocking gate cylinder, (2A) is a balance solenoid valve, (, 2?
) is the motor, (,2g) is the catalyst supply pipe, (29
) is the resin supply pipe, (yo) is the spray molding nozzle, (J/
) is a rubber hose.

Next, to explain the action, the buffer tank on one side (/6
) is supplying sand to the mixer (iJ).
Another buffer tank (/Aa) is replenished with sand (/) from the storage tank (/3). This operation is then repeated to enable continuous kneading and spray molding work.

In addition, the operation of the upper and lower gates is such that when the lower gate (1g) is open, the upper gate (/?) is closed. - The lower gate (/II) is activated by the off signal of the level switch (2).
is closed. Then, check this closed state and close the upper gate C.
I')) is opened and sand (ko/) is replenished. Note that the signal indicating the completion of replenishment is controlled by a timer.

The pressurizing solenoid valve (〃) is on during the lower gate (/8), is off at the closed end of the lower gate (cog), and is turned off when the sand (21) is closed.
When replenishment is completed, the upper gate C/'') is turned on at the closed end, and the buffer tank (/A) (/Aa) is pressurized.The balance solenoid valve (厖) is turned on at the kneading start command. Turn off at the kneading stop signal.

Since the present invention is configured as explained in detail above,
In addition to being able to continuously replenish sand to the storage tank,
Since the replenishing device capacity can be the same as the spraying capacity, the cost of equipment can be lower than in the past. Furthermore, since the capacity of the sand supply tank to be pressurized is small (about /θO~!r 00 , 1), the amount of air consumed is reduced. Since the capacity of the sand supply tank is small in this way, sand can be easily switched, and errors in quantitative determination due to sand pressure in the tank are reduced. In addition, the capacity of the storage tank can be freely selected, and existing storage tanks can also be used, and sand can be replenished from existing storage tanks using belts, packet elevators, pneumatic transportation, etc.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional sand supply gate device for spray molding, and FIG. 2 is a system diagram of a sand supply gate device for spray molding showing an embodiment of the present invention. Explanation of the main parts of the diagram/q...Continuous mixer/S...Sand storage tank lA, 16a#...Co-tank type buffer tank (sand supply tank) 17...Closed type upper gate) 1g... Sealed lower gate 19... air, 2/-.
・Sand 22...Pressure solenoid valve patent applicant: Mitsubishi Heavy Industries, Ltd. Tokyu Corporation

Claims (1)

[Claims] A spraying method characterized by comprising a pressurizing circuit that balances the internal pressure of a sand supply tank having a set of closed gates and the internal pressure of the mixer, and continuously supplying the sand in the tank to the mixer while maintaining quantitative accuracy. Sand supply gate device for molding.