JP6879063B2 - Recovery sand cooling system and recovery sand cooling method - Google Patents

Description

The present invention relates to a recovered sand cooling system and a recovered sand cooling method suitable for a green mold.

As is well known, green casting, which is a casting method using green sand as a mold, is widely used. In green casting, after the molten metal cast in the mold solidifies, the mold is disassembled to separate the sand used as the mold from the casting. The separated sand is recovered as recovered sand, kneaded and adjusted after foreign matter is removed and sand is cooled, and is used again for green mold molding.

The sand temperature and moisture of the recovered sand affect the subsequent kneading process and molding process. In particular, when the raw sand is sent to the kneading process or the molding process when the sand temperature of the recovered sand is high, sand adhesion due to the aggregation of water occurs on the inner wall of the raw sand storage hopper installed in front of the kneading machine. In addition, the accelerated drying of the sand after kneading reduces the binding force between the sands, which may cause mold loss, sand biting, and other molding defects.

Cooling of the recovered sand is often performed by utilizing the latent heat of vaporization when the moisture contained in the recovered sand evaporates into the air. In such cooling of the recovered sand using the latent heat of evaporation of water, water is cooled before cooling so that the recovered sand is cooled to a target temperature and the recovered sand after cooling has a certain amount of water. Is sprinkled on the recovered sand. The amount of water sprinkled is determined based on the measured values of the amount, temperature and water content of the recovered sand before cooling. Patent Document 1 discloses that the amount of water sprinkled is determined based on the temperature of the recovered sand after cooling in addition to the above-mentioned measured values.

Special Publication No. 62-40998

The amount of water evaporation largely depends on the condition of the surrounding air. However, since Patent Document 1 does not disclose the consideration of the state of air in the cooling device, in the method disclosed in Patent Document 1, the degree of cooling of the recovered sand and the degree of cooling of the recovered sand depend on the state of air. The amount of water in the recovered sand after cooling may vary. Therefore, it is not easy to obtain stable cooling and water content results, and it is difficult to always reliably cool the recovered sand.

An object to be solved by the present invention is to provide a recovered sand cooling system and a recovered sand cooling method capable of reliably cooling the recovered sand.

The recovered sand cooling system according to the present invention cools the recovered sand and adjusts the water content of the cooled recovered sand, and is a sand moisture temperature measuring device for measuring the water content and temperature of the recovered sand, and the recovered sand. A control device for determining an appropriate amount of water to be added to the water, and a sprinkling cooling device for adding the appropriate amount of water to the recovered sand and cooling it with the latent heat of evaporation of water to obtain the cooling recovered sand. The control device includes an air introduction device that introduces air into the sprinkler cooling device and an introduction air temperature measuring device that measures the temperature of the introduction air introduced into the sprinkler cooling device. The appropriate amount of water added is determined based on the temperature and the temperature of the introduced air.

Further, the recovered sand cooling system according to the present invention is a recovered sand cooling system that cools the recovered sand and adjusts the water content of the cooled recovered sand, and is a sand moisture temperature measuring device that measures the water content and temperature of the recovered sand. A control device for determining an appropriate amount of water to be added to the recovered sand, and water having an appropriate amount of water added to the recovered sand and cooled by the latent heat of evaporation of water to obtain the cooled recovered sand. The sprinkling cooling device, an air introducing device for introducing air into the sprinkling cooling device, and a cooling recovery sand moisture temperature measuring device for measuring the water content and temperature of the cooling recovery sand are provided, and the control device comprises the recovery. The appropriate amount of water added is determined based on the amount of water and temperature of the sand and the amount of water and temperature of the cooled recovery sand.

Further, the recovered sand cooling method according to the present invention is a recovered sand cooling method in which the recovered sand is cooled and the water content of the cooled recovered sand is adjusted, and the water content and temperature of the recovered sand are measured and the recovered sand is used. The appropriate amount of water to be added, which is the amount of water to be added, is determined, the amount of water to be added is added to the recovered sand, and the sand is cooled by the latent heat of evaporation of water while introducing air to obtain the cooled recovered sand. It includes measuring the temperature of the introduced air, and determines the appropriate amount of water added based on the water content and temperature of the recovered sand and the temperature of the introduced air.

Further, the recovered sand cooling method according to the present invention is a recovered sand cooling method in which the recovered sand is cooled and the water content of the cooled recovered sand is adjusted, and the water content and temperature of the recovered sand are measured and the recovered sand is used. The appropriate amount of water to be added, which is the amount of water to be added, is determined, and the water of the appropriate amount of water is added to the recovered sand and cooled by the latent heat of evaporation of water while introducing air to obtain the cooled recovered sand, which is cooled and recovered. It includes measuring the water content and temperature of the sand, and determines the appropriate water content based on the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand.

According to the present invention, it is possible to provide a recovered sand cooling system and a recovered sand cooling method capable of reliably cooling the recovered sand.

It is a schematic block diagram of the recovered sand cooling system shown as the 1st Embodiment of this invention. It is a block diagram of the control device in the recovered sand cooling system shown as the 1st Embodiment of this invention. It is a schematic block diagram of the recovered sand cooling system shown as the 2nd Embodiment of this invention. It is a block diagram of the control device in the recovered sand cooling system shown as the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of the recovered sand cooling system 1 shown as the first embodiment of the present invention. The recovered sand is the sand used as a mold separated from the casting after the molten metal cast in the mold is solidified in the green casting. The recovered sand is kneaded and adjusted after foreign matter is removed and sand is cooled, and is used again for green mold molding. The recovered sand cooling system 1 is a system that cools the raw recovered sand, especially in the green mold, and adjusts the water content of the cooled recovered sand.

The recovered sand cooling system 1 includes a sand moisture temperature measuring device 2 that measures the water content and temperature of the recovered sand, a control device 3 that determines the appropriate amount of water added to the recovered sand, and an appropriate amount of water added. Sprinkler cooling devices 4 and 5 that add water to the recovered sand and cool it with the latent heat of evaporation of water to make it cooled and recovered sand, an air introduction device 6 that introduces air into the sand cooling device, and an introduction introduced into the sand cooling device. An introduction air temperature measuring device 7 for measuring the temperature of air is provided.

Hereinafter, the recovered sand cooling system 1 will be described in detail. The recovered sand cooling system 1 includes a hopper 8 and a belt feeder 9. The hopper 8 stores the recovered sand separated from the casting. The belt feeder 9 is provided below the hopper 8. The recovered sand stored in the hopper 8 is supplied to the belt feeder 9 from a recovered sand supply port (not shown) provided in the hopper 8.

The belt feeder 9 includes an inverter motor 10 and is driven by the inverter motor 10. A control device 3 described later is electrically connected to the inverter motor 10, and the rotation speed of the inverter motor 10 is changed according to a signal from the control device 3. As a result, the recovered sand supplied to the belt feeder 9 is conveyed to the sprinkler cooling devices 4 and 5.

The sand moisture temperature measuring device 2 is provided on the belt feeder 9. The water content and temperature of the recovered sand transported on the belt feeder 9 are measured by the sand water content temperature measuring device 2. A control device 3 described later is electrically connected to the sand moisture temperature measuring device 2, and the moisture content and temperature of the recovered sand measured by the sand moisture temperature measuring device 2 are transmitted to the control device 3.

The watering cooling devices 4 and 5 include a watering device 4 and a sand cooling device 5. The recovered sand cooling system 1 includes a water source 11 and a water amount adjusting valve 12, and the water source 11 is connected to the watering device 4 to supply water to the watering device 4. The sprinkler 4 sprinkles the water supplied from the water source 11 on the recovered sand input from the belt feeder 9, and then stirs the recovered sand to disperse the water in the recovered sand. This recovered sand that has been sprinkled with water and dispersed with water is called water-recovered sand.

The water amount adjusting valve 12 is interposed between the water source 11 and the watering device 4. A control device 3 described later is electrically connected to the water amount adjusting valve 12. The water amount adjusting valve 12 is controlled so that the amount of water supplied from the water source 11 to the watering device 4 becomes the value of the appropriate amount of water added, which is the appropriate amount of water to be added to the recovered sand calculated by the control device 3. It is controlled by the device 3. As a result, the watering device 4 adds an appropriate amount of water to the recovered sand to make the water recovered sand.

The water-recovered sand that has been agitated by the watering device 4 and dispersed with water is discharged from the watering device 4 and put into the sand cooling device 5. The sand cooling device 5 cools the water recovery sand by bringing it into contact with the air in the sand cooling device 5. The cooled recovery sand is called a cooled recovery sand.

The recovered sand cooling system 1 includes an air heating device 13 and a dust collector 14. An air flow path is formed by an air heating device 13, a sand cooling device 5, a dust collector 14, and an air introduction device 6 so that air flows in this order. The air introduction device 6 provided at the end of the air flow path creates an air flow in the air flow path by sucking air from the direction of the upstream air heating device 13, and introduces the air into the sand cooling device 5. It is a suction type device.

The air heating device 13 is provided at the uppermost stream of this air flow path. The air heating device 13 heats the air taken in from the outside air or the indoor atmosphere by the suction of the air introduction device 6 as necessary, and introduces the air into the sand cooling device 5 as the introduction air. A control device 3 described later is electrically connected to the air heating device 13. The air heating device 13 is controlled by the control device 3 so that the temperature of the introduced air introduced into the sand cooling device 5 becomes an appropriate air temperature calculated by the control device 3 to heat the introduced air.

In the sand cooling device 5, the exhaust air whose temperature and humidity have increased due to the evaporation of water from the water recovery sand and the heat transfer from the sand is introduced into the dust collector 14. The dust collector 14 removes dust in the air flow path including the inside of the sand cooling device 5 introduced into the dust collector 14. The air from which the dust has been removed is discharged to the outside air via the air introduction device 6.

The air introduction device 6 includes an inverter motor 15 and is driven by the inverter motor 15. A control device 3 described later is electrically connected to the inverter motor 15. The inverter motor 15 is controlled by the control device 3 so that the air suction amount of the air introduction device 6 becomes an appropriate air volume calculated by the control device 3.

The recovered sand cooling system 1 includes an introduced air temperature measuring device 7, an exhaust air temperature measuring device 16, and an air volume measuring device 17 in order to measure the state of air in the above-mentioned air flow path. The introduced air temperature measuring device 7 is provided between the air heating device 13 and the sand cooling device 5, and measures the temperature of the introduced air introduced into the sand cooling device 5. A control device 3 described later is electrically connected to the introduced air temperature measuring device 7. The temperature of the introduced air measured by the introduced air temperature measuring device 7 is transmitted to the control device 3.

The exhaust air temperature measuring device 16 is provided between the sand cooling device 5 and the dust collector 14 and measures the temperature of the exhaust air discharged from the sand cooling device 5. A control device 3 described later is electrically connected to the exhaust air temperature measuring device 16. The temperature of the exhaust air measured by the exhaust air temperature measuring device 16 is transmitted to the control device 3.

The air volume measuring device 17 is provided between the dust collector 14 and the air introduction device 6, and the amount of air sucked by the air introduction device 6, that is, the air volume of the introduced air introduced into the sand cooling device 5. To measure. A control device 3 described later is electrically connected to the air volume measuring device 17. The air volume of the introduced air measured by the air volume measuring device 17 is transmitted to the control device 3.

The recovered sand cooling system 1 includes a belt conveyor 18 under the cooling recovered sand discharge port (not shown) of the sand cooling device 5. The belt conveyor 18 includes a motor 19 and is driven by the motor 19. The belt conveyor 18 conveys the cooled recovery sand discharged from the sand cooling device 5 to the next step such as a kneading device (not shown).

The recovered sand cooling system 1 includes a cooling recovered sand moisture temperature measuring device 20. The cooling recovery sand moisture temperature measuring device 20 measures the moisture content and temperature of the cooling recovery sand conveyed on the belt conveyor 18. A control device 3 described later is electrically connected to the cooling recovery sand moisture temperature measuring device 20. The moisture content and temperature of the cooling recovery sand measured by the cooling recovery sand moisture temperature measuring device 20 are transmitted to the control device 3.

As described above, the water content and temperature of the recovered sand measured by the sand moisture temperature measuring device 2, the water content and temperature of the cooled recovered sand measured by the cooling recovered sand moisture temperature measuring device 20, and the introduced air temperature measuring device 7 The temperature of the introduced air measured by, the temperature of the exhaust air measured by the exhaust air temperature measuring device 16, and the air volume of the introduced air measured by the air volume measuring device 17 are transmitted to the control device 3. The control device 3 receives these measured values and controls the inverter motor 10 of the belt feeder 9, the water amount adjusting valve 12, the inverter motor 15 of the air introduction device 6, and the air heating device 13 based on the measured values. ..

In this embodiment, the control device 3 determines the appropriate amount of water to be added based on the water content and temperature of the recovered sand and the temperature of the introduced air, and gives a watering instruction.
Further, the control device 3 corrects the operation of the system based on the water content and temperature of the cooling recovery sand.

The recovered sand cooling system 1 configured as described above includes a sand moisture temperature measuring device 2 that measures the water content and temperature of the recovered sand, and a control device that determines an appropriate amount of water added to the recovered sand. 3 and sprinkler cooling devices 4 and 5 in which water having an appropriate amount of water is added to the recovered sand and cooled by the latent heat of evaporation of the water to obtain the cooled recovered sand, and air for introducing air into the sprinkler cooling devices 4 and 5. The introduction device 6 and the introduction air temperature measuring device 7 for measuring the temperature of the introduction air introduced into the sprinkler cooling devices 4 and 5 are provided, and the control device 3 includes the water content and temperature of the recovered sand and the introduction. The appropriate amount of water added is determined based on the temperature of the air.

As a result, an appropriate environment in the recovered sand cooling system can be realized in consideration of the temperature of the introduced air. Therefore, even if the temperature and humidity change depending on the season, stable cooling and water content can be realized. It becomes possible to play an effect. Therefore, the recovered sand can be cooled to the target temperature regardless of the state of the introduced air.

Next, a second embodiment of the present invention will be described.
FIG. 3 is a schematic configuration diagram of the recovered sand cooling system 1A shown as the second embodiment of the present invention, and FIG. 4 is a block diagram of a control device in the recovered sand cooling system 1A.
In these figures, the same components as the components shown in FIGS. 1 and 2 described in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The difference between this embodiment and the first embodiment described above is that the control device 3 determines the appropriate amount of water added based on the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand. That's what I did.

That is, in this embodiment, in the recovered sand cooling system for cooling the recovered sand and adjusting the water content of the cooled recovered sand shown in FIG. 3, sand water temperature measurement for measuring the water content and temperature of the recovered sand. The vessel 2, the control device 3 for determining the appropriate amount of water added to the recovered sand, and the water of the appropriate amount of water added to the recovered sand and cooled by the latent heat of evaporation of the water to cool and recover. A sprinkling cooling device 4 or 5 for sand, an air introducing device 6 for introducing air into the sprinkling cooling devices 4 and 5, and a cooling recovery sand moisture temperature measuring device 20 for measuring the water content and temperature of the cooling recovery sand. The control device 3 determines the appropriate water content based on the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand.

In this embodiment, the appropriate amount of water is determined by the output of the sand moisture temperature measuring device 2 and the output of the cooling recovery sand moisture temperature measuring device 20, so that the introduced air shown in FIG. 1, which is a component of the first embodiment, is determined. The temperature measuring device 7 and the exhaust air temperature measuring device 16 are not provided.

Also in this embodiment, the same effect as that of the first embodiment described above can be obtained, and the recovered sand can be cooled to the target temperature.

The recovered sand cooling system and the recovered sand cooling method of the present invention are not limited to the above-described embodiments described with reference to the drawings, and various other modifications can be considered within the technical scope thereof. As long as it does not deviate from the gist of the present invention, it is possible to select the configuration described in the above embodiment or change it to another configuration as appropriate.

1, 1A Recovery sand cooling system 2 Sand moisture temperature measuring device 3 Control device 4 Sprinkler (sprinkler cooling device)
5 Sand cooling device (sprinkling cooling device)
6 Air introduction device 7 Introduction air temperature measuring device 8 Hopper 9 Belt feeder 10 Inverter motor 11 Water source 12 Water volume control valve 13 Air heating device 14 Dust collector 15 Inverter motor 16 Exhaust air temperature measuring device 17 Air volume measuring device 18 Belt conveyor 19 Motor 20 Cooling recovery sand Moisture temperature measuring device

Claims (7)

A recovery sand cooling system that cools the recovery sand and adjusts the amount of water in the recovery sand.
A sand moisture temperature measuring device that measures the moisture content and temperature of the recovered sand,
A control device that determines the appropriate amount of water added, which is the amount of water added to the recovered sand.
A watering device in which the appropriate amount of water is added to the recovered sand and the sand is stirred to disperse the water to obtain the recovered sand.
A cooling device that cools the water recovery sand with the latent heat of vaporization of water by bringing it into contact with air to obtain the cooling recovery sand.
An air introduction device that introduces air into the cooling device,
An introductory air temperature measuring device that measures the temperature of the introductory air introduced into the cooling device,
A belt feeder that conveys the collected sand to the watering device,
With
Wherein the control device, water content and temperature of the recovered sand, and, based on the temperature of the introduced air, to determine the proper amount of water,
A recovered sand cooling system that controls the belt feeder based on factors including the water content and temperature of the recovered sand and the temperature of the introduced air. An air volume measuring device that measures the air volume of the introduced air ,
An air heating device for heating the introduced air is provided.
The control device further determines the appropriate amount of water to be added based on the air volume .
The recovered sand cooling system according to claim 1 , wherein the air heating device is controlled based on an element including the water content and temperature of the recovered sand and the temperature of the introduced air. A recovery sand cooling system that cools the recovery sand and adjusts the amount of water in the recovery sand.
A sand moisture temperature measuring device that measures the moisture content and temperature of the recovered sand,
A control device that determines the appropriate amount of water added, which is the amount of water added to the recovered sand.
A watering device in which the appropriate amount of water is added to the recovered sand and the sand is stirred to disperse the water to obtain the recovered sand.
A cooling device that cools the water recovery sand with the latent heat of vaporization of water by bringing it into contact with air to obtain the cooling recovery sand.
An air introduction device that introduces air into the cooling device,
A cooling recovery sand moisture temperature measuring device for measuring the moisture content and temperature of the cooling recovery sand,
With
The control device determines the appropriate amount of water added based on the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand .
A recovery sand cooling system that controls the air introduction device based on factors including the water content and temperature of the recovered sand and the water content and temperature of the cooling recovery sand. An air volume measuring device that measures the air volume of the introduced air introduced into the cooling device, and
A belt feeder that conveys the collected sand to the watering device,
An air heating device for heating the introduced air is provided.
The control device further determines the appropriate amount of water to be added based on the air volume .
The recovered sand cooling system according to claim 3 , wherein the belt feeder and the air heating device are controlled based on an element including the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand. A method of cooling recovered sand that cools the recovered sand and adjusts the amount of water in the recovered sand.
Measure the water content and temperature of the recovered sand,
Determine the appropriate amount of water to be added to the recovered sand,
The appropriate amount of water was added to the recovered sand, and the sand was stirred to disperse the water to obtain the recovered sand.
By bringing the water recovery sand into contact with air while introducing air by an air introduction device, the sand is cooled by the latent heat of vaporization of water to obtain the cooling recovery sand.
Measuring the temperature of the introduced air introduced by the air introducing device ,
It includes transporting the recovered sand to a position where the recovered sand is prepared by adding water having an appropriate amount of water by a belt feeder.
The appropriate amount of water added is determined based on the water content and temperature of the recovered sand and the temperature of the introduced air .
A method for cooling recovered sand, which controls the belt feeder based on factors including the water content and temperature of the recovered sand and the temperature of the introduced air. A method of cooling recovered sand that cools the recovered sand and adjusts the amount of water in the recovered sand.
Measure the water content and temperature of the recovered sand,
Determine the appropriate amount of water to be added to the recovered sand,
The appropriate amount of water was added to the recovered sand, and the sand was stirred to disperse the water to obtain the recovered sand.
By bringing the water recovery sand into contact with air while introducing air by an air introduction device, the sand is cooled by the latent heat of vaporization of water to obtain the cooling recovery sand.
It includes measuring the water content and temperature of the cooled recovery sand.
Based on the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand, the appropriate water content is determined .
A method for cooling recovered sand, which controls the air introduction device based on an element including the water content and temperature of the recovered sand and the water content and temperature of the cooled recovered sand. Measuring the air volume of the introduced air introduced by the air introducing device ,
Heating the introduced air with an air heating device,
Including
The appropriate amount of water added is determined based on the air volume .
The recovered sand cooling method according to claim 5 or 6 , wherein the air heating device is controlled based on an element including the water content and temperature of the recovered sand.

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