JPS63264241A - Foundry sand supply and recovery system - Google Patents

Abstract

PURPOSE:To improve workability by quickly recovering with one worker by forming an ejector part by inserting the tip nozzle part of the discharging passage of a compressed air feeding source into the sand suction port of a sand storing tank with a sand separator. CONSTITUTION:A casting is taken out by executing the overhaul of a mold 10, a valve 6 of a discharging passage 2 is opened and the compressed air of from a compressed air feeding source 1 is injected from a nozzle part 3. An ejector action is thus caused on an ejector part, a sand suction port 4A is inserted into a frame and a casting sand 10 is sucked into a sand storing tank 4 from the sand suction port 4A together with a compressed airstream. It is revolved at the inner part thereof and separated in the casting sand 10 and air by the centrifugal force. And the air is exhaused to the atm. from an exhaust port 4C, the casting sand 10 falls to the bottom of the sand storing tank 4 in all by a strainer 7 and stored with recovery. A valve 8 is closed thereafter and since the outer periphery of the sand storing tank 4 is cooled by a cooling means 8 the casting sand 10 inside the tank 4 is rapidly cooled as well and dropped to the temp. reutilizable in short time.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a system for supplying and recovering molding sand that forms a mold during casting, and more specifically, a system for supplying and recovering molding sand that forms a mold during casting, and more specifically, a system for supplying and recovering molding sand that has been deformed after casting by saving labor. The present invention relates to a molding sand supply and recovery system that is capable of quickly recovering molding sand and supplying the recovered molding sand into a frame for reuse.

(Prior Art) Molding sand that has been demolded after casting is recovered and reused9. In particular, the molding sand used in the so-called full mold casting process, which uses a vanishing model mainly made of synthetic resin as a model, does not bond like general molding sand that uses wooden molds and metal molds as the model. Since it does not contain any chemicals, it can be reused as is.

Traditionally, such foundry sand recovery and supply systems
The molded molding sand is carried into a conveyor or other conveyor, which conveys it to a sand storage tank such as a hopper, where it is recovered, and when it is reused, it is dropped from the sand storage tank into a frame. There is.

(Problems to be Solved by the Invention) However, in the conventional recovery and supply system, it is necessary to take out the molded sand from the frame, and to transfer the taken out molding sand to a conveyor or other conveying device. All of these operations require a lot of manpower, require relatively long working hours, have poor workability, and have problems with conveyors, etc. Since a costly conveyance device is required, the equipment cost increases and is economically disadvantageous.

The present invention has been made in order to solve the problems of the prior art, and aims to improve workability by quickly recovering the molding sand that has been separated from the mold after casting by saving labor, and also to avoid large losses. It is an object of the present invention to provide a foundry sand recovery and supply system that does not require equipment and can thus achieve a reduction in equipment costs.

(Means for Solving the Problems) The present invention includes inserting the tip nozzle portion of the discharge passage of a compressed air supply source into the sand suction port of a sand storage tank with a sand separator to form an ejector portion, and compressing air from the nozzle portion. When the air is blown out, molding sand is introduced into the sand storage tank along with a compressed air flow, and is separated and recovered.The recovered molding sand is discharged and supplied from a sand supply port, and the compressed air flow is exhausted from an exhaust port. .

(Function) In the present invention, by jetting compressed air from the tip nozzle of the discharge passage of the compressed air supply source, an ejector action is generated in the ejector part, and the molded foundry sand can be collected into the sand storage tank. When reusing, sand can be supplied into the frame from the sand supply port of the sand storage tank.

(Embodiment) Fig. 1 is a system diagram showing an embodiment of the foundry sand supply and recovery system according to the present invention. This nozzle part 3 is inserted into the sand suction port 4A of the sand storage tank 4 with a sand separator, and the ejector part 5 is formed by the inner peripheral surface of the sand suction port 4A and the nozzle part 3.

A valve 6 is interposed in the discharge passage 2, and the sand suction pipe having the sand suction port 4A, except for the ejector portion 5, is formed of, for example, a flexible tube. At the center of the bottom of the sand storage tank 4 with a sand separator, a sand supply port 4B is formed with a downward opening and has a diameter that allows the foundry sand collected and stored inside to fall smoothly under its own weight.
2 are provided. Further, an exhaust port 4C is formed at the center of the upper part.

Inside the sand storage tank 4 with a sand separator, a strainer 7 is provided above the sand suction port 4A, and a strainer 7 is provided inside the sand storage tank 4 with a sand separator.
A cooling means 8 made of a water jacket is provided on the outer periphery of the cooling means 8. Cooling water is introduced into the cooling means 8 from a cooling water supply source (not shown) through a water supply pipe 8a, and is drained from a drainage pipe 8b. The foundry sand is cooled through the sand storage tank 4 as described later.

9 indicates a frame, and the molding sand 10, that is, the mold, inside the frame,
For example, a vanishing model 11 made of polystyrene resin is molded as a prototype. In the figure, 11a indicates a sprue.

Next, the operation of the above configuration will be explained. By performing casting from the sprue 11a, the vanishing model 11 embedded in the mold as a master model disappears, and a casting having a shape corresponding to the vanishing model 11 is formed in the mold 10.

After waiting for the casting to cool down, the mold 10 is disassembled to take out the casting. Then, the valve 6 of the discharge passage 2
The valve is opened and compressed air from the compressed air supply source 1 is jetted out from the nozzle part 3. This causes the ejector portion 5 to have an ejector action. Therefore, by inserting the sand suction port 4A into the frame, the molding sand 10 that has been deformed is sucked into the sand storage tank 4 from the sand suction port 4A together with the compressed air flow, swirls within the sand storage tank 4, and is molded by centrifugal force. sand l
It is separated into O and air. Then, the air passes through the strainer 7 and is exhausted to the atmosphere from the exhaust port 4C, and all of the foundry sand 10, including the fine particles caught by the strainer 7, falls to the bottom of the sand storage tank 4 and is collected and stored.

When all of the molding sand 10 in the molded frame 9 is recovered, the valve 6 is closed.

The outer periphery of the sand storage tank 4 with a sand separator is provided with cooling means 8
Naturally, the foundry sand 10 recovered in the sand storage tank 4 is rapidly cooled by the heat exchange action. Therefore, the temperature drops to a temperature at which it can be reused in a short time, that is, a temperature at which the vanishing model 11 used as a prototype can maintain its original shape without losing its shape due to temperature rise. Therefore, the cycle time of the casting operation can be significantly shortened.

In order to reuse the recovered foundry sand 1O that has been lowered to a predetermined temperature, the valve 12 of the sand supply port 4B may be opened. By opening the valve 12, the foundry sand lO is fed to the sand supply port 4.
It is discharged and supplied from B into the inside of the frame 9 by gravity, and is reused as a mold.

Since the air exhausted from the exhaust port 4C of the sand storage tank 4 with a sand separator has sand components completely removed by the strainer 7, no molding sand is released into the atmosphere. Of course, as described above, instead of the strainer 7 provided inside the sealed sand storage tank 4, for example, a Y-shaped strainer 7A may be provided at the exhaust port 4C as shown by the imaginary line. With this configuration, maintenance and inspection are easier than with the strainer 7, and clogging can be easily prevented. Further, as shown in FIG. 2, the cooling means 8 may be constructed by disposing a cooling water pipe in a spiral shape inside the sand storage tank 4 with a sand separator, particularly in the part where the foundry sand 10 is stored. It exhibits the same effect as the cooling means 8 formed by the water jacket described in the example.

(Effects of the Invention) According to the present invention, the tip nozzle portion of the discharge passage of the compressed air supply source is inserted into the sand suction port of the sand storage tank with a sand separator to form the ejector portion, and the compressed air is ejected from the nozzle portion. At times, molding sand is introduced into the sand storage tank along with a compressed air flow, separated and recovered, and the recovered molding sand is discharged and supplied from the sand supply port, and the compressed air flow is exhausted from the exhaust port. Unlike conventional molding sand collection and supply systems, many workers are not required, and the sand can be quickly collected by a single worker, significantly improving work efficiency. In addition, since there is no need for dedicated casting sand conveying equipment such as conveyors, which can be costly, equipment can be reduced.
It is also economically advantageous.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing another embodiment of the cooling means. 1...Compressed air supply source 2...Discharge passage 3...Nozzle part 4...Sand storage tank with sand separator 4A...Sand suction port 4B...Sand supply port 4C...Exhaust port 5... Ejector part 10... Foundry sand patent applicant Kubota Iron Works Co., Ltd. Agent Patent attorney Takashi Suzue - Figure 1

Claims (1)

[Claims] (1) Insert the tip nozzle part of the discharge passage of the compressed air supply source into the sand suction port of the sand storage tank with a sand separator to form an ejector part, and when compressed air is ejected from the nozzle part, compressed air flows into the sand storage tank. A molding sand supply and recovery system characterized in that molding sand is introduced and separated and recovered, the recovered molding sand is discharged and supplied from a sand supply port, and a compressed air flow is exhausted from an exhaust port.