JPS63264240A - Feeding and recovering system for casting sand - Google Patents

Abstract

PURPOSE:To improve a workability by quickly recovering by one worker by connecting the suction port of a vacuum pump to the exhaust port of a closed sand storing tank with a sand separator having a sand feeding port and sand suction port. CONSTITUTION:A casting is taken out by executing the overhaul of a mold 9, a valve 4 of a sand suction port 3B of a closed sand storing tank 3 with a sand separator is opened and the sand suction port 3B is inserted into a frame 8 by operating a vacuum pump 1. Accordingly, a casting sand 9 is sucked into the tank 3 from the sand suction port 3B together with an airstream and separated in the casting sand and air by centrifugal force with its revolving. The air is then passed through a strainer 6 and exhausted into the atm. from the discharging port of the vacuum pump 1, the casting sand 9 is dropped to the bottom of the tank 3 in all by the strainer 6 and stored with recovery. The valve 4 is thereafter closed and when the vacuum pump is stopped, the casting sand 9 is rapidly cooled since the outer periphery of the tank 3 is cooled by a cooling means 7. Consequently it falls to reutilizable temp. 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 quickly collecting molding sand that has been separated from the mold after casting by saving labor. The present invention relates to a molding sand supply and recovery system that is capable of 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 reused. 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 contain a binder like general molding sand that uses wooden molds and metal molds as the model. Because it does not contain any

Traditionally, such foundry sand recovery and supply systems
This is done by transporting the molded foundry sand to a conveyor or other conveyor, which transports 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. .

(Problems to be Solved by the Invention) However, in the conventional collection and supply system, there are two steps: taking out the molded sand from the frame, and transporting the taken out molding sand to a conveying device such as a conveyor. It requires carrying in sand, and each of these operations requires a lot of manpower, takes a relatively long time, and has the problem of poor workability, as well as the risk of major damage to conveyors, etc. Since a conveyance device is required, the equipment cost increases and it 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 molding sand recovery and supply system that does not require equipment and can therefore reduce equipment costs.

(Means for Solving Problems) The present invention connects the suction port of a vacuum pump to the exhaust port of a sand storage sealed tank with a sand separator having a sand supply port and a sand suction port, and when the vacuum pump is operated, the sand suction port is The foundry sand is separated and recovered by suctioning air flow into the sealed sand storage tank from the opening, and when the vacuum pump is stopped, the recovered foundry sand is discharged and supplied from the sand supply port.

(Function) In the present invention, by operating a vacuum pump, the molded sand can be collected from the sand suction port into the sealed storage sand tank, and when reused, it is supplied into the frame from the sand supply port of the sealed sand storage tank. can.

(Embodiment) FIG. 1 is a system diagram showing an embodiment of the foundry sand supply and recovery system according to the present invention. In the figure, 1 is a vacuum pump, and its suction port IA is It is connected to the exhaust port 3A of the sealed storage sand tank 3 with a sand separator.

The sealed sand storage tank 3 with a sand separator sucks and introduces molded sand, which will be described later, along with an air flow from its sand suction port 3B, separates the sand and air by centrifugal force, and then releases the air from an exhaust port 3A. It has a function of discharging the molding sand and letting it fall under its own weight and storing it inside, and has a sand supply port 3C formed at its bottom.

The sand suction pipe having the sand suction port 3B is made of, for example, a flexible tube, with a valve 4 interposed in the middle, and the sand supply port 3C is used to collect and store the foundry sand inside the sealed sand storage tank 3. It has a diameter that allows it to fall smoothly under its own weight, and is formed into a downward opening shape, and a valve 5 is provided at the tip.

Inside the sealed sand storage tank 3 with a sand separator, a strainer 5 is provided above the sand suction port 3B, and a cooling means 7 made of a quarter jacket is provided around the outer periphery of the tank 3. Cooling water is introduced from an unused cooling water supply source through the water supply vibrator 7a and drained from the drain vibrator 7b, thereby cooling the foundry sand through the closed sand storage tank 3 as described below.

Reference numeral 8 designates a frame, and a vanishing model 10 made of, for example, polystyrene resin is molded into the molding sand 9, that is, the mold, as a model. In the figure, 10a indicates a sprue.

Next, the operation of the above configuration will be explained. By performing casting from the sprue 10a, the vanishing model 10 embedded in the mold as a master disappears, and a casting having a shape corresponding to the vanishing model IO is formed in the mold 9.

After waiting for the casting to cool down, the mold 9 is disassembled to take out the casting. Next, the valve 4 of the sand suction port 3B of the sealed sand storage tank 3 with a sand separator is opened, the vacuum pump 1 is operated, and the sand suction port 3B is inserted into the frame 8. As a result, the deformed molding sand 9 is sucked into the air-sealed sand storage tank 3 from the sand suction port 3B along with the air flow, swirls inside the tank, and is separated into molding sand 9 and air by centrifugal force. . And the air is strainer 6
The foundry sand 9 passes through the exhaust port 3^, passes through the suction pipe 2, is sucked into the suction port IA of the vacuum pump 1, and is exhausted to the atmosphere from the discharge port IB. It falls to the bottom of the sealed sand storage tank 3 and is collected and stored.

When all of the molding sand 9 in the demolded frame 8 is collected, the valve 4 is closed and the vacuum pump 1 is stopped.

Since the outer periphery of the sealed sand storage tank 3 with a sand separator is cooled by the cooling means 7, the molding sand 9 recovered in the sand storage tank 3 is naturally rapidly cooled by the heat exchange action. Therefore, the temperature decreases to a temperature at which it can be reused in a short time, that is, a temperature at which the vanishing model 10 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 9 that has been lowered to a predetermined temperature, the valve 5 of the sand supply port 3C may be opened. By opening the valve 5, the molding sand 9 is discharged and supplied from the sand supply port 3C to the inside of the frame 8 by gravity, and is reused as a mold.

Since the air exhausted from the exhaust port 3A of the sealed sand storage tank 3 with a sand separator has sand components completely removed by the strainer 6, the vacuum pump 1 will not be damaged. Of course, as described above, instead of the strainer 6 provided inside the sealed sand storage tank 3, a Y-shaped strainer 6A, for example, may be interposed in the suction pipe 2, as shown by the imaginary line. By configuring like this,
Maintenance and inspection are easier than with the strainer 6, and clogging can be easily prevented. Furthermore, as shown in FIG. 2, the cooling means 7 may be constructed by arranging cooling water pipes in a spiral shape inside the closed tank 3 with a sand separator, particularly in the part where the foundry sand 9 is stored. It has the same effect as the cooling means 7 formed by the water jacket described in the example.

(Effects of the Invention) According to the present invention, the suction port of a vacuum pump is connected to the exhaust port of a sealed sand storage tank with a sand separator having a sand supply port and a sand suction port, and when the vacuum pump is operated, the sand suction port is The molding sand is sucked into the sealed sand storage tank along with an air flow, separated and collected, and the collected molding sand is discharged and supplied from the sand supply port, which is similar to the conventional molding sand collection and supply system. It does not require many workers to do this, and can be quickly collected by a single worker, resulting in a marked improvement in 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... Vacuum pump IA... Suction port 3... Sealed sand storage tank with sand separator 3A...
・Exhaust port 3B...Sand suction port 3C...Sand supply port 9...Casting sand Patent applicant Kubota Iron Works Co., Ltd. Agent Patent attorney Takashi Suzue - Figure 1

Claims (1)

[Claims] (1) Connect the suction port of the vacuum pump to the exhaust port of a sealed sand storage tank with a sand separator that has a sand supply port and a sand suction port,
When the vacuum pump is operated, molding sand is sucked together with an air flow from the sand suction port to the sealed sand storage tank, and separated and recovered;
A molding sand supply and recovery system characterized in that the recovered molding sand is discharged and supplied from the sand supply port when the vacuum pump is stopped.