JPS6334775Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a water injection mechanism for a foundry sand mixing device.

(Prior art) Conventionally, when injecting water into the kneading tank of a foundry sand kneading device,
The commonly used method is to inject a predetermined amount of water by using a timer to open an on-off valve attached to a water pipe connected to a water source with a constant water pressure for a predetermined period of time. It was difficult to do so.

(Purpose of the invention) The present invention was made in order to solve the above-mentioned problems, and its purpose is to provide a water injection mechanism for a foundry sand kneading device that can accurately inject a predetermined amount of water in a short period of time.

(Structure of the invention) Hereinafter, one embodiment of the invention will be described in detail based on the drawings. Reference numeral 1 is a batch-type kneading machine, and a hopper 2 is disposed directly above the kneading tank of the kneading machine 1. Further, an automatic measuring mechanism 3 for measuring sand properties is installed on the outer surface of the kneading tank. Reference numeral 4 denotes a water pressure regulator whose one end is connected to a water source (not shown) via a water supply pipe, and the other end of the water pressure regulator 4 is connected to a flow rate regulating valve 5, a flow meter 6, an electromagnetic shut-off valve 7, and a water sprinkler. The kneading tank of the kneading machine 1 is connected to the kneading tank of the kneading machine 1 through the water supply pipe to which the kneading machine 8 is attached. 9 is a water tank with an airtight structure, the bottom of the water tank 9 is connected to a water source (not shown) via a water supply pipe equipped with an electromagnetic shutoff valve 10, and the top of the water tank 9 is connected to an electromagnetic shutoff valve 11. Each is connected in communication to a compressed air source (not shown) via an air supply pipe. The bottom of the water tank 9 faces the kneading tank of the kneader 1 via a conduit 12 and a water sprinkler 13. Reference numeral 14 indicates a U-shaped communication pipe connected to both the upper and lower ends of the water tank 9, and the communication pipe 14 is made of a non-magnetic material. A float 15 to which a magnetic plate is fixed is inserted into the communication tube 14 so as to be movable up and down. Further, on the outside of the communication pipe 14, a plurality of magnetic body detection sensors 16a, 16b, . . . are provided vertically along the communication pipe 14 at required intervals. 17 is an electric control device, and the electric control device 17 is electrically connected to the electromagnetic on-off valves 7, 10, 11 and magnetic body detection sensors 16a, 16b, . . . .

(Operation of the device) Next, the operation of the device configured as described above will be explained. When the kneading machine 1 starts kneading the foundry sand, the properties of the foundry sand are measured by the automatic measuring device 3, and the measurement results are sent to the electric control device 17 to calculate the amount of water injection required for kneading. Next, the electric on-off valve 11 is opened by an electric signal from the control device 17, and compressed air is supplied to the upper part of the water tank 9, so that the water in the water tank 9 is adjusted to an amount approximate to the above-mentioned required water injection amount. The float 15 is released so as to descend to a position corresponding to:
Most of the required amount of water is injected into the kneading tank of the kneader 1 via the water sprinkler 13. When the float 15 descends to a predetermined position, the magnetic body detection sensor 16
The corresponding sensor among a to 16d detects this, and a water level signal in the water tank 9 is sent to the control device 17. In response, a signal is sent from the control device 17, and the electromagnetic on-off valve 11 is closed to stop the water. Water injection from tank 9 is stopped. Simultaneously with water injection from the water tank 9, the electromagnetic on-off valve 7 is also opened for a required period of time by an electric signal from the control device 17, and the water whose flow rate is controlled by the water pressure regulator 4 and the flow rate control valve 5 is released from the sprinkler 8. As a result, an amount of water corresponding to the remainder of the required water injection amount is released, and water injection is completed. The above water injection work is performed in a relatively short time of about 5 seconds. After water is injected, the electromagnetic on-off valve 10 is opened for a required period of time in response to an electric signal from the control device 17, and the water in the water tank 9 is replenished to its original level.

In addition, in the above embodiment, the amount of water to be poured is calculated by measuring the properties of the foundry sand during kneading, but the amount of water to be poured is calculated by measuring the amount of water in the recovered sand that is introduced through the hopper 2. You can do it like this.

(Effects of the invention) As is clear from the above explanation, according to the invention, most of the required amount of water is injected from the water tank, and the remainder of the required amount of water is supplied to the water supply pipe, which is adjusted to maintain a constant flow rate. Since water is injected from the beginning, the required amount of water can be injected accurately in a short period of time, resulting in excellent practical effects.

[Brief explanation of drawings]

The drawing is an overall configuration diagram showing an embodiment of the present invention. 1...Kneading machine, 4...Water pressure constant device, 5...Flow rate control valve, 7, 10, 11...Solenoid on-off valve, 9...
Water tank, 14...Communication pipe, 15...Float,
16a, 16b...Magnetic body detection sensor, 17...
Electrical control device.

Claims (1)

[Scope of utility model registration request] Outlet 1 of a conduit 12 connected in communication with its bottom
An air supply pipe leading to a compressed air source is connected via an electromagnetic on-off valve 11 to the upper end of an airtight water tank 9 facing the kneading tank of the kneader 1.
A water supply pipe leading to a water source is connected to the lower part of the water tank 9 via an electromagnetic on-off valve 10, and both ends of a communication pipe 14 made of a non-magnetic material are connected to both the upper and lower ends of the water tank 9, so that the communication A magnetic float 15 is inserted into the tube 14 so as to be able to rise and fall freely, and a plurality of magnetic body detection sensors 16 are installed outside the communication tube 14.
a, 16b... are arranged vertically at required intervals along the communication pipe 14, and a water source is connected to the kneading tank of the kneading machine 1 via an electromagnetic on-off valve 7, a flow rate adjustment valve 5, and a water pressure regulator 4. facing the water outlet 8 of the water supply pipe leading to A water injection mechanism for a foundry sand kneading device, characterized in that it is electrically connected to an electric control device 17 that outputs an electromagnetic valve opening/closing signal in response to a water amount signal from a water tank 9.