JPS6358670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a casting cooling device for cooling demolded castings.

(Prior Art) As an example of a means for cooling a casting, for example, as shown in Japanese Patent Application Laid-Open No. 49-98729, a disassembled casting and molding sand are placed in a rotating casting cooling cylinder, and the casting is cooled. There is a method of cooling castings using sand and the water contained in it. In this case, the casting is usually at a high temperature and cannot be cooled sufficiently, so water for cooling is supplied separately by the worker.

(Problem to be Solved by the Invention) However, since the temperature of the casting and molding sand introduced into the casting cooling cylinder is not necessarily constant, it is difficult to adjust the amount of cooling water replenishment, and the amount of replenishment water may become excessive. Or it may be too low. For this reason, even if an attempt is made to reuse the foundry sand discharged from the foundry cooling cylinder, the water content is too high and regeneration becomes difficult, or conversely, the foundry sand is heated by the hot casting due to the lack of make-up water. There is also the problem that the castings are not cooled sufficiently and are difficult to handle.

In other words, an object of the present invention is to prevent the thermal deterioration of molding sand caused by high-temperature castings and facilitate its reuse, while cooling the castings without being affected by the molding sand and without rapid cooling. It is an object of the present invention to provide a casting cooling device that can be used efficiently.

(Means for Solving the Problems) The present invention provides a method for cooling castings after demolding.
First and second casting cooling cylinders are provided, and the first casting cooling cylinder quickly separates the casting and foundry sand,
By cooling the castings in the second casting cooling cylinder while adjusting the temperature and moisture content of the cooling sand using dedicated cooling sand, it is possible to prevent thermal deterioration of the casting sand due to high-temperature castings, and to cool the castings. It is characterized by efficient cooling of castings without being affected by sand.

That is, the casting cooling device according to the present invention is a cylinder that introduces and cools castings together with molding sand, and has a cylindrical mesh that separates the castings from the molding sand by letting the molding sand pass through the inside of the cylinder. A first casting cooling cylinder installed with a gap, and a second casting cooling unit including a cooling sand introduction part, cooling the casting sent from the first casting cooling cylinder with cooling sand, and discharging the cooling sand used for this cooling. detecting the temperature of the cooling sand discharged from the cylinder, the molding sand recovery line that supplies the molding sand separated from the casting in the first casting cooling cylinder to the mold making line for reuse, and the second casting cooling cylinder. A sand temperature detector, a moisture detector for detecting the moisture content of the discharged cooling sand, and an adjusting means for adjusting the temperature and moisture content of the discharged cooling sand based on detection signals from the respective detectors. and a cooling sand circulation line for returning the cooling sand with adjusted moisture content to the cooling sand introduction part of the second casting cooling cylinder.

(Function) In the above casting cooling device, the casting and foundry sand introduced into the first casting cooling cylinder are separated by a cylindrical net,
The molding sand is sent to the molding sand recovery line in a state where the influence of heat from the hot castings is kept to a minimum. on the other hand,
The casting separated from the foundry sand is cooled by the cooling sand in the second foundry cooling cylinder, but since this casting has almost no foundry sand attached to it, the cooling sand comes into contact with the casting efficiently, increasing its cooling effect. As the temperature increases, cooling sand is used while adjusting its temperature and moisture content, so the casting is rapidly cooled, causing a temperature difference between the surface and the center, causing distortion, resulting in cracks, or cooling sand. It is possible to prevent the amount from becoming insufficient, and it becomes easy to respond to changes in the amount of castings fed into the second casting cooling cylinder.

(Effects of the Invention) Therefore, according to the present invention, since a cylindrical net is provided in the first casting cooling cylinder and a molding sand recovery line is connected to this cooling cylinder, the castings and the molding sand can be separated at an early stage. , it becomes possible to smoothly regenerate and use the foundry sand while preventing it from being thermally degraded by high-temperature castings, and only the castings separated from the foundry sand are affected by the foundry sand in the second foundry cooling cylinder. It will be possible to cool down without any trouble. A cooling sand circulation line with a sand temperature detector, a moisture detector, and temperature and moisture adjustment means was connected to the second casting cooling cylinder, so that the cooling sand was adjusted to an appropriate temperature and moisture content. Therefore, the casting can be efficiently cooled without problems of cracks caused by rapid cooling or insufficient cooling.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a casting cooling device, in which a first casting cooling cylinder 2 and a second casting cooling cylinder 3 are connected. In the first casting cooling cylinder 2, the casting 4 is introduced and cooled together with the casting sand 5, and the casting 4 and the casting sand 5 are separated. In the second casting cooling cylinder 3, the casting 4 is cooled by cooling sand 6 and transported out. First casting cooling cylinder 2
While the molding sand 5 discharged in the process is recycled and used,
The cooling sand 6 discharged from the second casting cooling cylinder 3 is circulated and used. Note that the casting 4 in this example is a brake drum.

In the first casting cooling cylinder 2, reference numeral 8 denotes an inlet opening facing a chute 9 through which the casting 4 is introduced together with the foundry sand 5. Inside the first casting cooling cylinder 2, a cylindrical wire mesh 10 for separating the casting 4 and foundry sand 5 is installed with a gap 12 between it and the cooling cylinder inner peripheral surface 11. A casting outlet 13 is provided at the end.
Further, a molding sand discharge port 14 is provided at the rear end of the gap 12.
are provided for each. In addition, the first casting cooling cylinder 2
A sprocket 15 is fitted on the outer periphery, and a drive device 16 is linked to the sprocket 15 via a transmission belt 17 for rotation.
A conveyor 19 of a molding sand recovery line 18 is attached below the molding sand discharge port 14, and the molding sand recovery line 18 is connected to the mold making line 20.
It is connected to the. Furthermore, a casting delivery chute 22 for delivering the casting 4 to the inlet 21 of the second casting cooling cylinder 3 is provided below the casting delivery port 13 .

The second casting cooling cylinder 3 includes a sand removal section 2 formed in a cylindrical shape with a wire mesh in the cooling section 24 provided with the introduction port 21.
5 are connected to each other, and a casting unloading section 26 is connected to the sand removal section 25, and a sprocket 27 is attached to the outer periphery similarly to the first casting cooling cylinder 2, and the sprocket 27 is rotated by a drive device 28 via a transmission belt 29. It is done like this. Then, this second casting cooling cylinder 3
is provided with a cooling sand circulation line 30 that circulates the cooling sand 6 by returning the cooling sand 6 discharged from the sand removal section 25 to the introduction port 21.

That is, in the cooling sand circulation line 30, 31 is a chute for receiving the cooling sand 6 falling from the sand removal part 25 of the second casting cooling cylinder 3, 32 is a first feeding conveyor provided below the chute 31, and 33
34 is a casting delivery chute in which the cooling sand 6 sent by the second feeding conveyor 33 is provided between the first casting cooling cylinder 2 and the second casting cooling cylinder 3. It is a bucket elevator that supplies 22.

Then, the second conveyor 33 is provided with a second conveyor 33 as a means for adjusting the temperature and moisture content of the cooling sand 6 by spraying cooling water onto the cooling sand 6 being conveyed and stirring the cooling sand. 1 and 2 feed water stirring towers 35 and 36 are installed upright, and each feed water stirring tower 35 and 36 has a water supply spray 37 and a stirrer 38.
is installed. In addition, before the cooling sand 6 reaches the first water supply stirring tower 35, a first sand amount detector 39 for detecting the amount of sand, a first moisture detector 40 for detecting the moisture content of the sand, and a sand temperature detector are provided. 1st to detect
A sand temperature detector 41 is provided, and a second sand amount detector 4 is provided between the first water supply stirring tower 35 and the second water supply stirring tower 36.
2. Second moisture detector 43 and second sand temperature detector 44
However, a third moisture detector 45 and a third sand temperature detector 46 are further provided next to the second water supply stirring tower 36, respectively.

That is, the first and second feed water stirring towers 3
5 and 36 are the first and second detectors 39,
40, 41 and 42, 43, 44 in response to the signals regarding the state of the cooling sand 6, respectively, supplying water and stirring the cooling sand 6, and adjusting the water content of the cooling sand 6 to, for example, 2.5 to 3%, and the sand temperature. The temperature should be adjusted so that it is 40 to 60°C. Further, the third moisture detector 45 and the third sand temperature detector 46 are used to finally inspect the condition of the cooling sand 6. For example, if the sand temperature is higher than the standard, cooling water is supplied separately. This is to bring the cooling sand 6 into a state that meets the standards.

On the other hand, the casting delivery section 26 of the second casting cooling cylinder 3 is provided with a delivery chute 47 for transporting the casting 4, and a conveyor 48 is provided below the delivery chute 47 for transporting the casting 4 to the next process. There is.

Incidentally, a dust remover is installed above the first water supply stirring tower 35 and the second water supply stirring tower 36 to remove sand and dust generated by stirring.

Next, to explain the operation, the molded casting 4 and molding sand 5 are first introduced into the first casting cooling cylinder 2,
While the casting 4 is slightly cooled by the casting sand 5 while passing through the rotating first casting cooling cylinder 2, the casting sand 5 passes through the mesh of the cylindrical wire mesh 10 and falls, and is separated from the casting 4. Therefore, since the foundry sand 5 is not exposed to the heat of the high-temperature casting 4 for a long time, thermal deterioration caused by the casting 4 is prevented. At this time, in order to prevent the molding sand 5 from being heated by the casting 4 and deteriorating,
Supply cooling water to the extent that the water content does not become excessive,
At the same time, cooling of the casting 4 may be encouraged. The foundry sand 5 separated in the first foundry cooling cylinder 2 is supplied to the mold making line 20 via the foundry sand recovery line 18, and is recycled and used for the next mold making.

On the other hand, the castings 4 sent out from the first casting cooling cylinder 2 are transferred from the casting delivery chute 22 to the second cooling sand 6 together with the cooling sand 6 being circulated in the cooling sand circulation line 30.
It is supplied to the casting cooling cylinder 3. Then, the casting 4 is cooled by the cooling sand 6 while passing through the rotating second casting cooling cylinder 3, and is carried out from the casting delivery section 26 onto a conveyor 48 for the next process, such as a product inspection process or assembly. It is transported to the attachment process, etc. Cooling sand 6 discharged from the sand removal part 25 of the second casting cooling cylinder 3
is sent to the second feed conveyor 33 via the chute 31 and the first feed conveyor 32, and is sent to each detector 39 to
According to the amount, moisture content, and temperature of the cooling sand 6 detected at 44, the sand temperature and moisture content are sequentially processed in the first water supply stirring tower 35 and then in the second water supply stirring tower 36 so that the sand temperature and moisture content match the reference values. After being adjusted, it is delivered to the casting delivery chute 22 by the bucket elevator 34.

Therefore, since the casting 4 has been previously separated from the molding sand 5 in the first casting cooling cylinder 2 and has almost no molding sand 5 attached to it, the cooling sand 6 is not applied to the casting 4. Efficient contact increases the cooling effect. The temperature and moisture content of the cooling sand 6 can be adjusted by each of the detectors 39 to 44 and the feed water stirring towers 35 and 36.
There is no possibility that the casting 4 will be cooled rapidly due to too much moisture or too low temperature, causing a crack, or that the casting 4 will not be cooled insufficiently due to too little moisture or too high a temperature. Further, even if the amount of the casting 4 charged into the second casting cooling cylinder 3 changes, the casting 4 can be stably cooled to a desired temperature by the above adjustment regardless of the change. In addition, the first casting cooling cylinder 2 does not require complete cooling of the casting 4 and separates the casting sand 5 from the casting 4 early.
It becomes easy to reproduce the foundry sand 5 by adjusting its temperature and moisture content.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of a casting cooling device, FIG. 2 is a side view partially showing the device in cross section, and FIG. 3 is a sectional view taken along the line - in FIG. 1. be. 1... Casting cooling device, 2... First casting cooling cylinder,
3... Second casting cooling cylinder, 4... Casting, 5... Foundry sand, 6... Cooling sand, 10... Cylindrical wire mesh, 11...
Cooling cylinder inner peripheral surface, 12... Gap, 18... Foundry sand recovery line, 20... Mold making line, 21... Inlet, 35, 36... Water supply stirring tower (adjustment means),
40, 43... Moisture detector, 41, 44... Sand temperature detector.

Claims (1)

[Claims] 1. A first casting, which is a cylinder into which the casting is introduced and cooled together with casting sand, and a cylindrical mesh is attached with a gap from the inner peripheral surface of the cylinder to allow the casting sand to pass through the inside and separate the casting from the casting sand. a cooling cylinder, a second casting cooling cylinder which is equipped with a cooling sand introduction part and which cools the casting sent from the first casting cooling cylinder with cooling sand and discharges the cooling sand used for this cooling; a molding sand recovery line connected to the molding sand recovery line for supplying molding sand separated from the castings to the mold making line for reuse;
A sand temperature detector and a moisture detector are connected to the casting cooling cylinder and detect the temperature and moisture content of the cooling sand discharged from this second casting cooling cylinder, and the detection signals from these detectors are used to detect the temperature and moisture content of the cooling sand discharged from the second casting cooling cylinder. The cooling sand circulation line is equipped with an adjusting means for adjusting the temperature and moisture content of the cooling sand and returns the cooling sand whose temperature and moisture content have been adjusted to the cooling sand introduction part of the second casting cooling cylinder. Casting cooling equipment.