WO2018051891A1 - 回収砂冷却システム及び回収砂冷却方法 - Google Patents
回収砂冷却システム及び回収砂冷却方法 Download PDFInfo
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- WO2018051891A1 WO2018051891A1 PCT/JP2017/032307 JP2017032307W WO2018051891A1 WO 2018051891 A1 WO2018051891 A1 WO 2018051891A1 JP 2017032307 W JP2017032307 W JP 2017032307W WO 2018051891 A1 WO2018051891 A1 WO 2018051891A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
- B22C5/085—Cooling or drying the sand together with the castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/18—Plants for preparing mould materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/10—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by dust separating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/14—Equipment for storing or handling the dressed mould material, forming part of a plant for preparing such material
- B22C5/16—Equipment for storing or handling the dressed mould material, forming part of a plant for preparing such material with conveyors or other equipment for feeding the material
Definitions
- the present invention relates to a recovered sand cooling system and a recovered sand cooling method suitable for a green mold.
- green casting which is a casting method using green sand as a mold
- green mold casting after the molten metal cast in the mold is solidified, the mold is released, and the sand used as the mold is separated from the casting. The separated sand is recovered as recovered sand, mixed and adjusted after foreign matter removal and sand cooling, and used again for green molding.
- the sand temperature and moisture of the recovered sand will affect the subsequent kneading process and molding process.
- the sand adheres to the inner wall of the green sand storage hopper installed in front of the kneader due to water aggregation.
- the bonding strength between the sands is reduced, which may cause molding defects such as mold dropping and sand biting.
- Refrigerated sand is often cooled using latent heat of vaporization when water contained in the collected sand evaporates into the air.
- the recovered sand In cooling the recovered sand using the latent heat of vaporization of water, the recovered sand is cooled to a target temperature, and water is cooled before cooling so that the recovered sand after cooling has a certain amount of water. Is sprinkled on the recovered sand.
- the amount of water spray is determined based on the measured values of the amount, temperature and moisture content of the recovered sand before cooling.
- Patent Document 1 discloses that the amount of water spray is determined based on the temperature of the recovered sand after cooling in addition to the above measured values.
- Patent Document 1 Japanese Patent Publication No. 62-40098
- Patent Document 1 is not disclosed with regard to the state of air in the cooling device, in the method disclosed in Patent Document 1, depending on the state of air, the degree of cooling of the recovered sand, There may be variations in the amount of water in the recovered sand after cooling. Therefore, it is not easy to obtain stable cooling and water-containing results, and it is difficult to always reliably cool the recovered sand.
- the problem 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 cools the recovered sand and adjusts the moisture content of the cooled recovered sand, and measures the moisture content and temperature of the recovered sand, the sand moisture temperature measuring device, and the recovered sand.
- a control device for determining an appropriate amount of water to be added to the water a water spray cooling device for adding the appropriate amount of water to the recovered sand, cooling with the latent heat of water evaporation to form the cooled recovered sand, An air introduction device for introducing air into the water spray cooling device, and an introduction air temperature / humidity measuring device for measuring the temperature and humidity of the introduction air introduced into the water spray cooling device, wherein the control device comprises the recovered sand.
- the appropriate amount of water is determined based on the amount and temperature of the water and the temperature and humidity of the introduced air.
- the recovered sand cooling method according to the present invention is a recovered sand cooling method for cooling the recovered sand and adjusting the moisture content of the cooled recovered sand, measuring the moisture content and temperature of the recovered sand, An appropriate amount of water, which is the amount of water to be added, is determined, the appropriate amount of water is added to the recovered sand, cooled with the latent heat of evaporation of water while introducing air, and the cooled recovered sand is introduced.
- the method includes measuring the temperature and humidity of the introduced air, and determining the appropriate amount of water based on the moisture content and temperature of the recovered sand and the temperature and humidity of the introduced air.
- the recovered sand cooling system is a recovered sand cooling system that cools recovered sand and adjusts the moisture content of the cooled and recovered sand, and measures the moisture content and temperature of the recovered sand. And a control device for determining an appropriate amount of water to be added to the recovered sand, and adding the appropriate amount of water to the recovered sand and cooling it with the latent heat of water evaporation to form the cooled recovered sand.
- a water spray cooling device, an air introduction device that introduces air into the water spray cooling device, and an introduction air temperature measuring device that measures the temperature of the introduced air introduced into the water spray cooling device the control device includes: The appropriate amount of water added is determined based on the moisture content and temperature of the recovered sand and the temperature of the introduced air.
- the recovered sand cooling system is a recovered sand cooling system that cools recovered sand and adjusts the moisture content of the cooled and recovered sand, and measures the moisture 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 adding the appropriate amount of water to the recovered sand and cooling it with the latent heat of water evaporation to form the cooled recovered sand.
- the appropriate amount of water is determined based on the moisture content and temperature of the sand and the moisture content and temperature of the cooled and recovered sand.
- the recovered sand cooling method according to the present invention is a recovered sand cooling method for cooling the recovered sand and adjusting the moisture content of the cooled recovered sand, measuring the moisture content and temperature of the recovered sand, An appropriate amount of water, which is the amount of water to be added, is determined, the appropriate amount of water is added to the recovered sand, cooled with the latent heat of evaporation of water while introducing air, and the cooled recovered sand is introduced. Measuring the temperature of the introduced air, and determining the appropriate amount of water based on the moisture content and temperature of the recovered sand and the temperature of the introduced air.
- the recovered sand cooling method according to the present invention is a recovered sand cooling method for cooling the recovered sand and adjusting the moisture content of the cooled recovered sand, measuring the moisture content and temperature of the recovered sand, An appropriate amount of water, which is the amount of water to be added, is determined, and the appropriate amount of water is added to the recovered sand, cooled by the latent heat of evaporation of water while introducing air, and used as the cooled recovery sand, and the cooling recovery The method includes measuring the moisture content and temperature of sand, and determining the appropriate amount of water based on the moisture content and temperature of the recovered sand and the moisture content and temperature of the cooled and recovered sand.
- FIG. 1 is a schematic configuration diagram of a recovered sand cooling system 1 shown as an embodiment of the present invention.
- the recovered sand is obtained by separating the sand used as a mold from the casting after the molten metal cast in the mold is solidified in the green casting.
- the collected sand is kneaded and adjusted after foreign matter removal and sand cooling, and is used again for green molding.
- the recovered sand cooling system 1 is a system that cools the green recovered sand, particularly in the green mold, and adjusts the moisture of the cooled recovered sand.
- the recovered sand cooling system 1 includes a sand moisture temperature measuring device 2 that measures the moisture content and temperature of the recovered sand, a control device 3 that determines an appropriate amount of water to be added to the recovered sand, and an appropriate amount of water added. Water is added to the recovered sand, and the sprinkler cooling devices 4 and 5 are cooled to the cooling recovery sand by cooling with the latent heat of water evaporation, the air introduction device 6 for introducing air into the sand cooling device, and the introduction introduced into the sand cooling device. And an introduction air temperature / humidity measuring device 7 for measuring the temperature and humidity of the air.
- the recovered sand cooling system 1 includes a hopper 8 and a belt feeder 9.
- the hopper 8 stores recovered sand separated from the casting.
- the belt feeder 9 is provided under the hopper 8.
- the collected sand stored in the hopper 8 is supplied to the belt feeder 9 from a collected 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 to be described later is electrically connected to the inverter motor 10 and is configured such that the rotational speed of the inverter motor 10 changes according to a signal from the control device 3. Thereby, the collected sand supplied to the belt feeder 9 is conveyed to the water spray cooling devices 4 and 5.
- the sand moisture temperature measuring device 2 is provided on the belt feeder 9.
- the collected sand conveyed on the belt feeder 9 is measured for moisture content and temperature by the sand moisture temperature measuring device 2.
- a controller 3 described later is electrically connected to the sand moisture temperature measuring device 2, and the moisture content and temperature of the collected sand measured by the sand moisture temperature measuring device 2 are transmitted to the controller 3.
- the water spray cooling devices 4 and 5 include a water spray device 4 and a sand cooling device 5.
- the recovered sand cooling system 1 includes a water source 11 and a water amount adjustment valve 12, and the water source 11 is connected to the watering device 4 and supplies water to the watering device 4.
- the water sprinkler 4 sprinkles the water supplied from the water source 11 with respect to the collected sand thrown from the belt feeder 9, and then agitates the collected sand to disperse the water in the collected sand.
- This recovered sand in which water has been dispersed by dispersing water is referred to as “hydrolyzed recovered sand”.
- the water amount adjustment valve 12 is interposed between the water source 11 and the watering device 4.
- a controller 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 water sprinkler 4 becomes a value of an appropriate amount of water that is an appropriate amount of water added to the collected sand calculated by the control device 3. It is controlled by the device 3. Thereby, the water sprinkler 4 adds the appropriate amount of water to the recovered sand to obtain the recovered water.
- the hydrolyzed recovered sand that has been agitated by the watering device 4 and in which water has been dispersed is discharged from the watering device 4 and put into the sand cooling device 5.
- the sand cooling device 5 cools the hydrolyzed recovered sand by bringing it into contact with the air in the sand cooling device 5.
- the cooled recovered sand is referred to as cooled recovered sand.
- the recovered sand cooling system 1 includes an air heating device 13 and a dust collecting device 14.
- One air flow path is formed by the air heating device 13, the sand cooling device 5, the dust collecting device 14, and the air introducing device 6 so that air flows in this order.
- the air introduction device 6 provided at the end of this air flow path draws air from the direction of the upstream air heating device 13 to create an air flow in the air flow path, and introduces air into the sand cooling device 5. It is a suction type device.
- the air heating device 13 is provided in the uppermost stream of this air flow path.
- the air heating device 13 heats the air taken in from the outside air or the room atmosphere by suction of the air introduction device 6 as necessary, and introduces the air to the sand cooling device 5 as introduction air.
- the air heating device 13 is electrically connected to a control device 3 to be described later.
- the air heating device 13 is controlled by the control device 3 so as to heat the introduced air 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.
- the exhausted air whose temperature and humidity are increased by evaporation of water from the hydrolyzed recovered sand and 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 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 through 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 to be 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 amount calculated by the control device 3.
- the recovered sand cooling system 1 includes an introduction air temperature / humidity measuring device 7, a discharge air temperature / humidity measuring device 16, and an air flow measuring device 17 in order to measure the state of air in the air flow path.
- the introduced air temperature / humidity measuring instrument 7 is provided between the air heating device 13 and the sand cooling device 5, and measures the temperature and humidity of the introduced air introduced into the sand cooling device 5.
- the introduced air temperature / humidity measuring instrument 7 is electrically connected to a control device 3 to be described later. The temperature and humidity of the introduced air measured by the introduced air temperature / humidity measuring instrument 7 are transmitted to the control device 3.
- the exhaust air temperature / humidity measuring device 16 is provided between the sand cooling device 5 and the dust collector 14, and measures the temperature and humidity of the exhaust air discharged from the sand cooling device 5.
- the exhaust air temperature / humidity measuring device 16 is electrically connected to a control device 3 to be described later. The temperature and humidity of the exhaust air measured by the exhaust air temperature / humidity measuring device 16 are transmitted to the control device 3.
- the air volume measuring device 17 is provided between the dust collector 14 and the air introducing device 6, and the amount of air sucked by the air introducing device 6, that is, the air volume of the introduced air introduced into the sand cooling device 5. Measure.
- a control device 3 to be described later is electrically connected to the air flow 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 below the cooling recovery 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 and recovered 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 cooled recovered sand moisture temperature measuring device 20.
- the cooling recovery sand moisture temperature measuring device 20 measures the amount of moisture and the temperature of the cooling recovery sand conveyed on the belt conveyor 18.
- the cooling recovery sand moisture temperature measuring device 20 is electrically connected to a control device 3 to be described later.
- the water content and temperature of the cooled and collected sand measured by the cooled and collected sand moisture temperature measuring device 20 are transmitted to the control device 3.
- the moisture content and temperature of the recovered sand measured by the sand moisture temperature measuring device 2 As described above, the moisture content and temperature of the recovered sand measured by the sand moisture temperature measuring device 2, the moisture content and temperature of the cooled recovered sand measured by the cooled recovered sand moisture temperature measuring device 20, and the introduced air temperature and humidity measuring device.
- the temperature and humidity of the introduced air measured by 7, the temperature and humidity of the discharged air measured by the discharged air temperature / humidity measuring device 16, and the air volume of the introduced air measured by the air flow measuring device 17 are sent to the control device 3. Sent.
- the control device 3 receives these measured values, performs calculations described later with reference to FIGS. 3 to 6, and based on the results, the inverter motor 10 of the belt feeder 9, the water amount adjustment valve 12, and the air introduction device 6.
- the inverter motor 15 and the air heating device 13 are controlled.
- the control device 3 performs the three types of processing, that is, the determination of the appropriate amount of water and the instruction of watering, the operation correction based on the water content and temperature of the cooled recovery sand, and the operation correction based on the temperature and humidity of the exhaust air, thereby recovering the recovered sand.
- the operation of the cooling system 1 is controlled. First, the structure of the control apparatus 3 required in order to determine the proper amount of water and to instruct watering will be described.
- control device 3 determines an appropriate amount of water.
- the control device 3 includes a necessary evaporation water amount calculation unit 31, an evaporation allowable water vapor amount calculation unit 32, an appropriate water addition amount determination unit 33, a comparison calculation unit 34, and a control unit 35. ing.
- the required evaporated water amount calculation unit 31 calculates the required evaporated water amount based on the temperature of the recovered sand and the input amount of the recovered sand. As described above, the hydrolyzed recovered sand is mainly cooled by the latent heat of evaporation due to water evaporation in the sand cooling device 5. The required amount of evaporated water is the amount of evaporated water per unit time required for cooling the hydrolyzed recovered sand to the target temperature by latent heat of evaporation.
- the temperature of the recovered sand measured by the sand moisture temperature measuring device 2 is T s1 (K)
- the cooling target temperature of the hydrolyzed recovered sand is T s2 (K)
- the input amount of recovered sand, that is, the sand cooling device 5 is input.
- the amount of collected sand per unit time is G s (kg / min)
- the specific heat of recovered sand is C s (kJ / kg ⁇ K)
- the latent heat of vaporization of water is L w (kJ / kg).
- the required amount of evaporated water per hour Q v (kg / min) is expressed by the following equation.
- the recovered sand amount G s per unit time input to the sand cooling device 5 is, in the present embodiment, that the recovered sand supply amount from the hopper 8 to the belt feeder 9 is constant per unit time, and , the control device 3 is connected to the inverter motor 10 of the belt feeder 9, recognize the driving speed of the inverter motor 10, because it is controllable, by converting the driving speed of the inverter motor 10 as recovered sand amount G s Used.
- the hydrolyzed sand is cooled by the latent heat of evaporation due to evaporation of water from the hydrolyzed sand and heat transfer from the sand to the air, but the cooling effect by the latent heat of evaporation is largely dominant. Therefore, each process of the arithmetic unit 3 is determined on the assumption of this.
- the evaporation allowable water vapor amount calculation unit 32 calculates the evaporation allowable water vapor amount based on the temperature and humidity of the introduced air and the air volume.
- the hydrolyzed recovered sand is mainly cooled by the latent heat of vaporization caused by the evaporation of water in the sand cooling device 5, so that the introduced air introduced into the sand cooling device 5 is discharged after receiving the evaporated water vapor. It is discharged from the sand cooling device 5 as air.
- the control device 3 the comparison operation unit 34 to be described later, acceptable water vapor introduced air is equivalent to require the evaporation water Q v per unit time Judge whether or not.
- the evaporation allowable water vapor amount calculation unit 32 has already determined that the amount of water vapor per unit time that can be evaporated by the sand cooling device 5 with the current introduction air, that is, the introduction air introduced per unit time is already present.
- the evaporation allowable water vapor amount W a (kg / min) per unit time which is the amount of water vapor that can be held in addition to the humidity that is possessed, is calculated.
- the total amount W max (kg / min) of the water vapor amount per unit time that the current introduction air can have is examined.
- the humidity that the introduced air can have that is, the amount of water vapor, is 100% in relative humidity, but the absolute humidity differs depending on the air temperature. Therefore, the total amount W max of water vapor per unit time that the current introduced air can have is the temperature of the introduced air measured by the introduced air temperature / humidity measuring device 7 as T a1 (K), and the relative humidity 100 at the temperature T a1 .
- the absolute humidity corresponding to% is X max (kg / kg-air) and the air volume, that is, the amount of introduced air measured by the air volume measuring device 17, G a (kg-air / min), Is done.
- X max as described above, in the unit system of G a, wherein a kg-air is intended to represent the amount of air, in order to distinguish the unit kg are used to represent the amount of water It is a description.
- the correspondence relationship between the temperature T a1 of the introduced air and the absolute temperature X max is held, for example, in the form of a table or function in the control device 3 or the like, and when calculating the total amount W max of water vapor that the introduced air can have. It may be referred to as appropriate.
- the absolute humidity of the introduced air measured by the introduced air temperature / humidity measuring instrument 7 is expressed as X 1 ( (kg / kg-air)
- the evaporation allowable water vapor amount W a (kg / min) per unit time can be calculated by the following equation.
- the comparison calculation unit 34 calculates the required amount of evaporated water Q v (kg / min) per unit time represented by the equation (1) and the allowable evaporation water vapor amount W a (kg) per unit time represented by the equation (3). / Min). Whether Thus, whether it is possible to reliably perform cooling in sand cooling device 5, i.e., introducing air introduced per unit time, accept steam quantity only requires evaporative water Q v per unit time Determine whether.
- the comparison calculation unit 34 selects one or any of the inverter motor 15 of the air introduction device 6, the inverter motor 10 of the belt feeder 9, and the air heating device 13 depending on whether the relationship between Q v and W a is in the states 1 to 3. These combinations are controlled to determine a control operation for controlling any one or a combination of the air volume, the input amount of collected sand, and the temperature of the introduced air.
- the control operation determined in each of the states 1 to 3 will be described in detail.
- state 1 Q v > W a , which means that the amount of water vapor to evaporate per unit time is greater than the amount of water vapor that can be held in addition to the humidity of the introduced air introduced per unit time.
- This is a state in which the amount of water vapor to be evaporated is not accepted by all the introduced air, and the sand recovered by the sand cooling device 5 is not sufficiently cooled. Therefore, it is necessary to reduce the amount of water vapor to be evaporated per unit time, or to increase the amount of water vapor that can be held in addition to the humidity that the introduced air introduced per unit time already has, to achieve the state 2 described above. .
- a control operation is determined that is one or a combination of increasing the air volume, reducing the amount of collected sand input, and increasing the temperature of the introduced air. To do.
- the comparison calculation unit 34 first increases the rotational speed of the inverter motor 15 of the air introduction device 6 to increase the air volume, thereby increasing the amount of introduced air introduced per unit time.
- the comparison calculation unit 34 transmits a control operation for adjusting the inverter motor 15 of the air introduction device 6 to the control unit 35 so that the air volume becomes the calculated value.
- the comparison calculation unit 34 further reduces the rotational speed of the inverter motor 10 of the belt feeder 9 to reduce the input amount of the collected sand. To reduce the amount of water vapor to be evaporated per unit time.
- the input amount of recovered sand that is, an appropriate value of the recovered sand amount G s per unit time can be obtained. calculate.
- the comparison calculation unit 34 performs a control operation for adjusting the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value. To the control unit 35.
- the lower limit G sL is set as the set value. Note that the lower limit G sL is set by, for example, an operator entering the control device 3 in advance.
- the equation (1) solves the equation according to formula (3) is a value that depends on the temperature T a1 for introducing air, the absolute appropriate values of humidity X 1 of the introduced air Is done.
- the comparison calculation unit 34 calculated the temperature of the introduced air with the air heating device 13. A control operation for increasing the value is transmitted to the control unit 35.
- the upper limit value of the temperature of the introduced air be, for example, about 45 ° C.
- state 3 Q v ⁇ W a, and this is because the amount of water vapor to be evaporated per unit time is greater than the amount of water vapor that can be held in addition to the humidity of the introduced air already introduced per unit time.
- the introduced air introduced per unit time can sufficiently absorb the water vapor, and basically the recovered sand is sufficiently cooled even if this state is maintained.
- the state 3 is, in other words, a state in which an excessive amount of introduced air is introduced into the recovered sand, the state 3 is brought into the state 2 by reducing the air volume, increasing the input amount of the recovered sand, or the like.
- the comparison calculation unit 34 first reduces the air volume by reducing the rotational speed of the inverter motor 15 of the air introduction device 6 and reduces the amount of introduced air introduced per unit time. We consider reducing the amount of water vapor that the introduced air introduced per unit time can have. An appropriate value of the air volume is calculated in the same manner as described in the state 1. Thereafter, the comparison calculation unit 34 transmits a control operation for adjusting the inverter motor 15 of the air introduction device 6 to the control unit 35 so that the air volume becomes the calculated value.
- the air flow should not be lower than a value that can collect the dust in the sand cooling device 5.
- the comparison calculation unit 34 further rotates the rotation speed of the inverter motor 10 of the belt feeder 9. To increase the amount of water vapor to be evaporated per unit time by increasing the amount of collected sand input. Therefore, as in the case of state 1, input amount of recovered sand, i.e., to calculate the appropriate value of the recovered sand amount G s per unit time. Thereafter, in addition to the control operation related to the inverter motor 15 of the air introduction device 6, the comparison calculation unit 34 performs a control operation for adjusting the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value. To the control unit 35.
- the control unit 35 executes the control operation transmitted from the comparison calculation unit 34. More specifically, the inverter motor 10 of the belt feeder 9, the inverter motor 15 of the air introduction device 6, and the air heating device 13 are controlled. The control unit 35 also receives a control operation transmitted by an appropriate water addition amount determination unit 33 described later, and controls the water amount adjustment valve 12.
- the appropriate water addition amount determination unit 33 determines the appropriate water addition amount per unit time based on the required amount of evaporated water calculated per unit time calculated by the required evaporation water amount calculation unit 31.
- the cooled recovered sand which is the recovered sand after cooling, is preferably used as a sand mold again, and therefore preferably has a certain amount of moisture before the kneading adjustment. That is, the hydrolyzed recovered sand is cooled by the latent heat of evaporation in the sand cooling device 5 so that the evaporated water is lost. However, it is preferable that the subsequent cooled recovered sand still has a certain amount of water.
- the proper amount of water added is the amount of water sprayed per unit time in the water spraying device 4 that is necessary for the cooled recovered sand to have this constant water content.
- the appropriate amount of water added per unit time Q w (kg / kg) min) is expressed by the following equation.
- control device 3 determines an appropriate amount of water based on the moisture and temperature of the collected sand, the temperature and humidity of the introduced air, and the air volume.
- This method measures the moisture content and temperature of the recovered sand, determines the appropriate amount of water to be added to the recovered sand, adds the appropriate amount of water to the recovered sand, and introduces air while introducing air.
- This includes cooling with latent heat of evaporation to form cooled recovered sand, and measuring the temperature and humidity of the introduced air introduced. Based on the moisture content and temperature of the recovered sand and the temperature and humidity of the introduced air Determine the appropriate amount of water.
- the method also includes measuring the air volume of the introduced air, and determining an appropriate amount of water based further on the air volume.
- the recovered sand separated from the casting is put into the hopper 8.
- the hopper 8 supplies the collected sand to the belt feeder 9.
- the belt feeder 9 conveys the collected sand to the watering device 4.
- the sand moisture temperature measuring device 2 measures the moisture content and temperature of the collected sand conveyed on the belt feeder 9 and transmits the measurement result to the control device 3.
- the drive speed of the inverter motor 10 of the belt feeder 9 is controlled by the control device 3. (Step S1).
- the required evaporation water amount calculation unit 31 of the control device 3 receives the temperature (T s1 ) of the collected sand received from the sand moisture temperature measuring device 2 and the input amount of the collected sand, that is, the inverter motor 10 managed by the control device 3. Based on the amount of sand collected per unit time (G s ) obtained by converting the driving speed, the required amount of evaporated water Q v per unit time is calculated by the equation (1) (step S2).
- the air introduction device 6 is driven by the inverter motor 15, and air flows through the air flow path formed by the air heating device 13, the sand cooling device 5, the dust collecting device 14, and the air introduction device 6. Thereby, the introduction air is introduced into the sand cooling device 5.
- the introduced air temperature / humidity measuring instrument 7 measures the temperature and humidity of the introduced air, and transmits the measurement result to the control device 3.
- the air volume measuring device 17 measures the air volume of the introduced air introduced into the sand cooling device 5 and transmits the measurement result to the control device 3 (step S3).
- the evaporation allowable water vapor amount calculation unit 32 of the control device 3 receives the temperature (T a1 ), the absolute humidity (X 1 ) of the introduced air received from the introduced air temperature / humidity measuring device 7, and the air flow received from the air flow measuring device 17 ( Based on G a ), the evaporation allowable water vapor amount W a per unit time is calculated by the equations (2) and (3) (step S4).
- Comparison operation unit 34 of the control device compares the required evaporation water Q v per unit calculated time in a step S2, the evaporation allowable water vapor content W a per unit calculated time in In step S4 (step S5). Whether Thus, whether it is possible to reliably cool the sand cooling device 5, i.e., introducing air introduced per unit time, accept steam quantity only requires evaporative water Q v per unit time Determine whether.
- the comparison calculation unit 34 first increases the rotational speed of the inverter motor 15 of the air introduction device 6 to increase the air volume, thereby increasing the amount of introduced air introduced per unit time. Consider increasing the amount of water vapor that the introduced air introduced per unit time can have.
- the comparison calculation unit 34 calculates an appropriate value of the air volume using the equations (1) to (4) in the manner described above. Thereafter, the comparison calculation unit 34 transmits a control operation for adjusting the inverter motor 15 of the air introduction device 6 to the control unit 35 so that the air volume becomes the calculated value.
- the comparison calculation unit 34 further reduces the rotational speed of the inverter motor 10 of the belt feeder 9 to reduce the input amount of the collected sand. To reduce the amount of water vapor to be evaporated per unit time. For this purpose, an appropriate value of the amount of collected sand per unit time is calculated as in the case of the above-described air volume.
- the comparison calculation unit 34 performs a control operation for adjusting the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value. To the control unit 35.
- the lower limit G sL is set as the set value. Note that the lower limit G sL is set by, for example, an operator entering the control device 3 in advance.
- the comparison calculation unit 34 calculates the temperature of the introduced air with the air heating device 13. A control operation for increasing the value is transmitted to the control unit 35.
- the control unit 35 receives the control operation and controls the inverter motor 10 of the belt feeder 9, the inverter motor 15 of the air introduction device 6, and the air heating device 13 based on the control operation.
- the control unit 35 receives the above-described instruction for maintaining the current situation as a control operation.
- the inverter motor 10 of the belt feeder 9, the inverter motor 15 of the air introduction device 6, and the air heating device 13 are controlled so as to maintain the current state.
- step S8 As a result of the comparison in step S5, when Q v ⁇ W a (state 3), the amount of water vapor to be evaporated per unit time is added to the humidity already contained in the introduced air introduced per unit time. In order to reduce utility costs and increase the amount of cooling treatment per unit time, either or both of reducing the air volume and increasing the input amount of recovered sand, A control operation for setting the state 2 is determined (step S8).
- the comparison calculation unit 34 first reduces the air volume by reducing the rotational speed of the inverter motor 15 of the air introduction device 6 and reduces the amount of introduced air introduced per unit time. We consider reducing the amount of water vapor that the introduced air introduced per unit time can have. An appropriate value of the air volume is calculated in the same manner as described in the state 1. Thereafter, the comparison calculation unit 34 transmits a control operation for adjusting the inverter motor 15 of the air introduction device 6 to the control unit 35 so that the air volume becomes the calculated value.
- the air flow should not be lower than a value that can collect the dust in the sand cooling device 5.
- the comparison calculation unit 34 further rotates the rotation speed of the inverter motor 10 of the belt feeder 9. To increase the amount of water vapor to be evaporated per unit time by increasing the amount of collected sand input. Therefore, as in the case of state 1, input amount of recovered sand, i.e., to calculate the appropriate value of the recovered sand amount G s per unit time. Thereafter, in addition to the control operation related to the inverter motor 15 of the air introduction device 6, the comparison calculation unit 34 performs a control operation for adjusting the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value. To the control unit 35.
- the control unit 35 receives the control operation and controls the inverter motor 10 of the belt feeder 9 and the inverter motor 15 of the air introduction device 6 based on the control operation.
- the input amount and introduction of the collected sand in the recovered sand cooling system 1 are performed.
- step S9 and subsequent steps to be described below each measurement value in a state where the environment has changed to an ideal by the control operation is measured again by each measuring device, and the necessary amount of evaporated water Q v per unit time is again measured from this remeasurement value. It was calculated again, based on the required evaporation water Q v and the re-measured value calculated again to determine the proper amount of water Q w per unit time in the ideal state.
- the sand moisture temperature measuring device 2 measures the moisture content and temperature of the collected sand conveyed on the belt feeder 9, and transmits the measurement result to the control device 3.
- the drive speed of the inverter motor 10 of the belt feeder 9 is controlled by the control device 3 so that the collected sand is introduced at the speed calculated in steps S6 to S8. (Step S9).
- the required evaporation water amount calculation unit 31 of the control device 3 receives the temperature (T s1 ) of the collected sand received from the sand moisture temperature measuring device 2 and the input amount of the collected sand, that is, the inverter motor 10 managed by the control device 3. Based on the amount of sand collected per unit time (G s ) obtained by converting the driving speed, the required amount of evaporated water Q v per unit time is calculated by the equation (1) (step S10).
- the introduction air temperature / humidity measuring instrument 7 measures the temperature and humidity of the introduction air, and transmits the measurement result to the control device 3.
- the air volume measuring device 17 measures the air volume of the introduced air introduced into the sand cooling device 5 and transmits the measurement result to the control device 3.
- the temperature and air volume of the introduced air are controlled by the control device 3 so as to be the values calculated in steps S6 to S8 (step S11).
- the evaporation allowable water vapor amount calculation unit 32 of the control device 3 receives the temperature (T a1 ), the absolute humidity (X 1 ) of the introduced air received from the introduced air temperature / humidity measuring device 7, and the air flow received from the air flow measuring device 17 ( Based on G a ), the evaporation allowable water vapor amount W a per unit time is calculated by the equations (2) and (3) (step S12).
- the appropriate amount of water Q w per unit time is the amount of water to be added in addition to the required amount of evaporated water Q v per unit time and the amount of water at the time of charging the collected sand, as described above using the equation (4). It is calculated by the sum of.
- Step S6 ⁇ is adjusted environmental recovered sand cooling system 1 by the process of S8, since necessary evaporating water Q v per unit time becomes an appropriate value, is determined based on equation (4) based on this proper amount of water Q w per unit time also has a similarly appropriate value.
- the control unit 35 controls the water amount adjustment valve 12 based on the control operation received from the appropriate water addition amount determination unit 33.
- the amount of water per unit time supplied from the water source 11 to the nozzle device 4 is adjusted to a proper amount of water Q w, hydro recovered sand having an appropriate moisture content is generated (step S14).
- the water sprinkler 4 agitates the recovered water and disperses the water.
- the sand cooling device 5 cools the agitated hydrolyzed sand discharged from the water sprinkling device 4 with the introduced air introduced into the sand cooling device 5 by the latent heat of water evaporation.
- the sand cooling device 5 discharges the cooled and recovered sand onto the belt conveyor 18 driven by the motor 19.
- the belt conveyor 18 conveys the cooled and recovered sand discharged from the sand cooling device 5 to the next step such as a kneading device (not shown).
- the exhaust air whose temperature and humidity are increased by evaporation of water and heat transfer from the sand is introduced into the dust collector 14.
- the dust collector 14 removes dust from the introduced air and discharges the air from which the dust has been removed to the outside air.
- step S14 it is determined whether or not to perform operation correction based on the moisture content and temperature of the cooled recovered sand, which will be described later. Whether or not to perform the operation correction is determined based on, for example, a set value input by the operator in advance to the control device 3 of the recovered sand cooling system 1.
- step S21 step S20.
- step S40 When the operation correction based on the moisture content and temperature of the cooling recovery sand is not performed, it is determined whether or not the operation correction based on the exhaust air temperature and humidity, which will be described later, is performed. Whether or not to perform the operation correction is determined based on, for example, a set value input by the operator in advance to the control device 3 of the recovered sand cooling system 1.
- step S40 the processing is shifted to the motion correction processing shown as step S41 (step S40).
- Step S60 When the operation correction based on the temperature and humidity of the discharged air is not performed, it is determined whether or not to continue the series of processes of the recovered sand cooling system 1. Whether to continue the processing is determined based on, for example, a set value or the like previously input by the operator to the control device 3 of the recovered sand cooling system 1. If the process is to be continued, the process returns to step S1, and the processes after step S1 are repeated. By returning to step S1, when the amount of collected sand or air volume is changed by a correction operation or the like to be described later, each measured value is measured again, and the required amount of evaporated water Q v per unit time and per unit time are measured. evaporation allowable amount of water vapor W a is recalculated, the value is updated. When not executing, a series of processing of this recovery sand cooling system 1 is ended (Step S60).
- control device 3 includes a first correction amount calculation unit 36 as shown in FIG.
- a proper amount of water determination unit 33 determines the proper amount of water Q w, the amount of water by controlling the water amount adjusting valve 12, is supplied from a water source 11 to the sprinkler 4 is adjusted to a proper amount of water Q w, after the processing corresponding to step S14 in FIG. 3, the first correction amount calculating unit 36, based on the moisture content and temperature of the cooling recovery sand sand cooling device 5 discharges Then, the correction amount of any one or a combination of the air volume, the input amount of recovered sand, and the appropriate water addition amount is calculated.
- the first correction amount calculating unit 36 receives the water content W s3 (%) and the temperature T s3 (K) of the cooling recovery sand moisture temperature measuring device 20. The first correction amount calculation unit 36 compares these values with the above-described target moisture amount W s2 (%) of the cooling recovery sand and the cooling target temperature T s2 (K), respectively.
- W s3 > W s2 and T s3 > T s2 are established as the comparison result. If (state A), W s3 ⁇ W s2 and T s3 > T s2 is satisfied (state B), W s3 > W s2 and T s3 ⁇ T s2 is satisfied (state C), and W s3 ⁇ W s2 and T s3 ⁇ T s2 may be satisfied (state D), which may be in any state.
- the first correction amount calculation unit 36 determines the relationship between W s3 and W s2 , and T s3 and T s2 , the inverter motor 15 of the air introduction device 6, the inverter motor 10 of the belt feeder 9, and the water amount adjustment valve 12. By controlling either or any combination of the above, calculate the correction amount of any one or any combination of the air volume, the input amount of recovered sand, and the appropriate amount of water added, and control each device by the calculated correction amount.
- the correction control operation to be performed is determined.
- the correction control operation determined in each of the states A to D will be described in detail.
- the first correction amount calculation unit 36 first increases the rotational speed of the inverter motor 15 of the air introduction device 6 to increase the air volume, and the water vapor that the introduced air introduced per unit time can have.
- the first correction amount calculation unit 36 transmits to the control unit 35 a correction control operation for adjusting the inverter motor 15 of the air introduction device 6 so that the air volume becomes the calculated value.
- the first correction amount calculation unit 36 When the airflow value calculated by the first correction amount calculation unit 36 exceeds the capacity limit of the inverter motor 15 of the air introduction device 6, or increased to a value equivalent to the capacity limit of the inverter motor 15 of the air introduction device 6. However, if it is insufficient to achieve the target value, the first correction amount calculation unit 36 further reduces the rotational speed of the inverter motor 10 of the belt feeder 9 and inputs the amount of collected sand. Consider reducing the above. The input amount of recovered sand is calculated based on the equations (1) to (4).
- the first correction amount calculation unit 36 adjusts the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value.
- the correction control operation to be performed is transmitted to the control unit 35.
- the lower limit G sL is set as the set value. Note that the lower limit G sL is set by, for example, an operator entering the control device 3 in advance.
- the first correction amount calculation unit 36 considers increasing the amount of water supplied to the sprinkler 4 by increasing the opening degree of the water amount adjustment valve 12. The amount of water is calculated based on the equations (1) to (4) as in the case of the state A. Thereafter, the first correction amount calculation unit 36 transmits a correction control operation for increasing the opening of the water amount adjustment valve 12 to the control unit 35 so that the water amount becomes the calculated value.
- the first correction amount calculation unit 36 considers reducing the amount of water supplied to the watering device 4 by reducing the opening of the water amount adjustment valve 12.
- the amount of water is calculated based on (1) to (4) as in the case of state A.
- the first correction amount calculation unit 36 transmits a correction control operation for reducing the opening of the water amount adjustment valve 12 to the control unit 35 so that the water amount becomes the calculated value.
- the first correction amount calculation unit 36 considers increasing the amount of water supplied to the watering device 4 by increasing the opening of the water amount adjustment valve 12.
- the amount of water is calculated based on the equations (1) to (4) as in the case of the state A.
- the first correction amount calculation unit 36 transmits a correction control operation for increasing the opening of the water amount adjustment valve 12 to the control unit 35 so that the water amount becomes the calculated value.
- the 1st correction amount calculation part 36 considers reducing the rotational speed of the inverter motor 15 of the air introduction apparatus 6, reducing air volume, and reducing evaporation amount by this.
- the air volume reduction amount is calculated based on the equations (1) to (4) as in the case of the state A.
- the first correction amount calculation unit 36 transmits to the control unit 35 a correction control operation for adjusting the inverter motor 15 of the air introduction device 6 so that the air volume becomes the calculated value.
- the air flow should not be lower than a value that can collect the dust in the sand cooling device 5.
- the control unit 35 receives and executes the correction control operation transmitted from the first correction amount calculation unit 36, and performs any of the inverter motor 10 of the belt feeder 9, the water amount adjustment valve 12, and the inverter motor 15 of the air introduction device 6. Or any combination.
- step S20 it is determined whether or not to perform the operation correction based on the moisture content and temperature of the cooled recovered sand, and when the setting for performing the operation correction is made, the correction process described as step S21 is performed.
- FIG. 5 shows details of the correction process S21.
- the cooling / recovery sand moisture temperature measuring device 20 measures the amount and temperature of the cooling / recovery sand transported on the belt conveyor 18 and transmits the measurement result to the control device 3 (step S22). ).
- the first correction amount calculation unit 36 of the control unit 35 receives the water content W s3 (%) of the cooling recovery sand water and the temperature T s3 (K) from the cooling recovery sand water temperature measuring device 20, and calculates these values.
- the above-mentioned target moisture content W s2 (%) of the cooling recovery sand and the cooling target temperature T s2 (K) are respectively compared (step S23).
- the first correction amount calculation unit 36 first increases the rotational speed of the inverter motor 15 of the air introduction device 6 to increase the air volume, and the water vapor that the introduced air introduced per unit time can have. Consider increasing the amount. The amount of increase in air volume is calculated based on equations (1) to (4). Thereafter, the first correction amount calculation unit 36 transmits to the control unit 35 a correction control operation for adjusting the inverter motor 15 of the air introduction device 6 so that the air volume becomes the calculated value.
- the first correction amount calculation unit 36 When the airflow value calculated by the first correction amount calculation unit 36 exceeds the capacity limit of the inverter motor 15 of the air introduction device 6, or increased to a value equivalent to the capacity limit of the inverter motor 15 of the air introduction device 6. However, if it is insufficient to achieve the target value, the first correction amount calculation unit 36 further reduces the rotational speed of the inverter motor 10 of the belt feeder 9 and inputs the amount of collected sand. Consider reducing the above. The input amount of recovered sand is calculated based on the equations (1) to (4).
- the first correction amount calculation unit 36 adjusts the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value.
- the correction control operation to be performed is transmitted to the control unit 35.
- the lower limit G sL is set as the set value. Note that the lower limit G sL is set by, for example, an operator entering the control device 3 in advance.
- step S23 when W s3 ⁇ W s2 and T s3 > T s2 (state B), the amount of water sprayed in the water spraying device 4 is insufficient, so that the water content is reduced in the sand cooling device 5. It is in a state where it is not sufficiently evaporated and cooling of the hydrated recovered sand by latent heat of evaporation is insufficient. Also in this case, the control operation for making W s3 equal to W s2 and T s3 equal to T s2 is determined (step S25).
- the first correction amount calculation unit 36 considers increasing the amount of water supplied to the watering device 4 by increasing the opening of the water amount adjustment valve 12. The amount of water is calculated based on the formulas (1) to (4). Thereafter, the first correction amount calculation unit 36 transmits a correction control operation for increasing the opening of the water amount adjustment valve 12 to the control unit 35 so that the water amount becomes the calculated value.
- step S23 when W s3 > W s2 and T s3 ⁇ T s2 (state C), the amount of water sprayed in the water spraying device 4 is too large, so that the hydrolyzed sand recovered in the sand cooling device 5 While it is sufficiently cooled, a large amount of excess water that has not been evaporated and exceeds the target is left in the cooled recovery sand. Also in this case, the control operation for making W s3 equal to W s2 and T s3 equal to T s2 is determined (step S26).
- the first correction amount calculation unit 36 considers reducing the amount of water supplied to the watering device 4 by reducing the opening degree of the water amount adjustment valve 12. The amount of water is calculated based on the formulas (1) to (4). Thereafter, the first correction amount calculation unit 36 transmits a correction control operation for reducing the opening of the water amount adjustment valve 12 to the control unit 35 so that the water amount becomes the calculated value.
- step S23 As a result of the comparison in step S23, when W s3 ⁇ W s2 and T s3 ⁇ T s2 (state D), the hydrolyzed recovered sand is sufficiently cooled in the sand cooling device 5, but the amount of water spray is small. Therefore, the moisture of the cooling recovery sand is low. Also in this case, the control operation for making W s3 equal to W s2 and T s3 equal to T s2 is determined (step S27).
- the first correction amount calculation unit 36 considers increasing the amount of water supplied to the watering device 4 by increasing the opening of the water amount adjustment valve 12. The amount of water is calculated based on the formulas (1) to (4). Thereafter, the first correction amount calculation unit 36 transmits a correction control operation for increasing the opening of the water amount adjustment valve 12 to the control unit 35 so that the water amount becomes the calculated value.
- the 1st correction amount calculation part 36 considers reducing the rotational speed of the inverter motor 15 of the air introduction apparatus 6, reducing air volume, and reducing evaporation amount by this.
- the reduction amount of the air volume is calculated based on the equations (1) to (4).
- the first correction amount calculation unit 36 transmits to the control unit 35 a correction control operation for adjusting the inverter motor 15 of the air introduction device 6 so that the air volume becomes the calculated value.
- the air flow should not be lower than a value that can collect the dust in the sand cooling device 5.
- the control unit 35 receives the correction control operation and, based on the correction control operation, selects one or any combination of the inverter motor 10 of the belt feeder 9, the water amount adjustment valve 12, and the inverter motor 15 of the air introduction device 6. Control (step S28).
- step S40 shown in FIG. 4 is executed.
- step S40 it is determined whether or not to perform operation correction based on the temperature and humidity of exhaust air, which will be described later. Whether or not to perform this operation correction is determined based on, for example, a set value input by the operator in advance to the control device 3 of the recovered sand cooling system 1.
- the processing is shifted to the later-described operation correction processing shown as step S41.
- Step S60 When the operation correction based on the temperature and humidity of the discharged air is not performed, it is determined whether or not to continue the series of processes of the recovered sand cooling system 1. Whether to continue the processing is determined based on, for example, a set value or the like previously input by the operator to the control device 3 of the recovered sand cooling system 1.
- step S1 the processes after step S1 are repeated.
- step S60 When the amount of collected sand, air volume, etc. is changed by this correction operation, etc., each measured value is measured again, the required amount of evaporated water Q v per unit time, and the evaporation per unit time permissible amount of water vapor W a is recalculated, the value is updated.
- Step S60 a series of processing of this recovery sand cooling system 1 is ended.
- control device 3 includes a second correction amount calculation unit 37 as shown in FIG.
- the second correction amount calculation unit 37 corrects any one or any combination of the air volume, the input amount of collected sand, and the temperature of the introduced air based on the temperature and humidity of the exhaust air discharged from the sand cooling device 5. Calculate the amount.
- the second correction amount calculation unit 37 receives the temperature and humidity of the exhaust air from the exhaust air temperature / humidity measuring device 16. The second correction amount calculation unit 37 calculates the value of relative humidity at the temperature from these values.
- the second correction amount calculation unit 37 first increases the rotation speed of the inverter motor 15 of the air introduction device 6 to increase the air volume, and the relative humidity of the discharged air is set to about 90 to 95%, for example. Consider reducing it to The increase amount of the air volume is calculated based on the equations (1) to (4). Thereafter, the second correction amount calculation unit 37 transmits to the control unit 35 a correction control operation for adjusting the inverter motor 15 of the air introduction device 6 so that the air volume becomes the calculated value.
- the second correction amount calculation unit 37 further reduces the rotation speed of the inverter motor 10 of the belt feeder 9. To reduce the input amount of collected sand.
- the input amount of recovered sand is calculated based on the equations (1) to (4).
- the second correction amount calculation unit 37 adjusts the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value.
- the correction control operation to be performed is transmitted to the control unit 35.
- the lower limit G sL is set as the set value. Note that the lower limit G sL is set by, for example, an operator entering the control device 3 in advance.
- the second correction amount calculation unit 37 further considers raising the set temperature in the air heating device 13.
- the temperature of the introduced air is calculated based on the equations (1) to (4).
- the second correction amount calculating unit 37 calculates the temperature of the introduced air by using the air heating device 13 in addition to the correction control operation related to the inverter motor 15 of the air introduction device 6 and the inverter motor 10 of the belt feeder 9.
- the control operation to raise the speed to the control unit 35 is transmitted to the control unit 35.
- the control unit 35 receives and executes the correction control operation transmitted from the second correction amount calculation unit 37, and performs any of the inverter motor 15 of the air introduction device 6, the inverter motor 10 of the belt feeder 9, and the air heating device 13. Or any combination.
- each correction amount is calculated based on the equations (1) to (4) as described above. Prior to this calculation, the absolute humidity is expressed as the humidity in the equations (1) to (4). Since it is used, the 2nd correction amount calculation part 37 converts the relative humidity of exhaust air into absolute humidity.
- step S40 it is determined whether or not to perform the operation correction based on the temperature and humidity of the discharged air, and when the setting for performing the operation correction is made, the main correction process described in step S41 is performed.
- FIG. 6 shows details of the correction process S41.
- the exhaust air temperature / humidity measuring device 16 measures the temperature and humidity of the exhaust air discharged from the sand cooling device 5, and transmits the measurement result to the control device 3 (step S42).
- the second correction amount calculation unit 37 of the control unit 35 receives the temperature and humidity of the exhaust air from the exhaust air temperature / humidity measuring device 16, and calculates the value of the relative humidity at the temperature from these values. Furthermore, the second correction amount calculation unit 37 determines whether the calculated relative humidity value is, for example, 95% or more (step S43).
- the value of the relative humidity is a value close to 100%, for example, 95% or more, any one or any of the air volume, the input amount of collected sand, and the temperature of the introduced air, which is appropriate for preventing condensation.
- the correction amount of the combination is calculated (step S44).
- the second correction amount calculation unit 37 first considers increasing the rotational speed of the inverter motor 15 of the air introduction device 6 so that the relative humidity of the discharged air is, for example, about 90 to 95%.
- the increase amount of the air volume is calculated based on the equations (1) to (4). Thereafter, the second correction amount calculation unit 37 transmits to the control unit 35 a correction control operation for adjusting the inverter motor 15 of the air introduction device 6 so that the air volume becomes the calculated value.
- the second correction amount calculation unit 37 further reduces the rotation speed of the inverter motor 10 of the belt feeder 9. To reduce the input amount of collected sand.
- the input amount of recovered sand is calculated based on the equations (1) to (4).
- the second correction amount calculation unit 37 adjusts the inverter motor 10 of the belt feeder 9 so that the input amount of the collected sand becomes the calculated value.
- the correction control operation to be performed is transmitted to the control unit 35.
- the lower limit G sL is set as the set value. Note that the lower limit G sL is set by, for example, an operator entering the control device 3 in advance.
- the second correction amount calculation unit 37 further considers raising the set temperature in the air heating device 13.
- the temperature of the introduced air is calculated based on the equations (1) to (4).
- the second correction amount calculating unit 37 calculates the temperature of the introduced air by using the air heating device 13 in addition to the correction control operation related to the inverter motor 15 of the air introduction device 6 and the inverter motor 10 of the belt feeder 9.
- the control operation to raise the speed to the control unit 35 is transmitted to the control unit 35.
- the control unit 35 receives the correction control operation and, based on the correction control operation, selects one or any combination of the inverter motor 15 of the air introduction device 6, the inverter motor 10 of the belt feeder 9, and the air heating device 13. Control (step S45).
- Step S60 is executed.
- the processes after step S1 are repeated.
- each measured value is measured again, the required amount of evaporated water Q v per unit time, and the evaporation per unit time permissible amount of water vapor W a is recalculated, the value is updated.
- the operation correction process is executed at a speed of about 0.5 to 2.0% of each correction amount in about 2 to 10 seconds. It is desirable to correct and control the air volume and the input amount of collected sand. Further, regarding the temperature of the introduced air, it is desirable to perform correction control at a correction amount of about 0.5 to 3 ° C. in about 2 to 10 seconds.
- the comparison calculation unit 34 evaporates per unit time based on the temperature and humidity of the introduced air, which is expressed by the equation (3).
- the allowable water vapor amount W a (kg / min) is compared with the required amount of evaporated water Q v (kg / min) per unit time represented by the formula (1), so that the hydrolyzed recovered sand is effectively cooled. Therefore, the you are determined whether air introduced per unit time can accept necessary evaporation water Q v corresponding steam.
- the required amount of evaporated water per unit time is larger than the amount of allowable evaporation water vapor per unit time (state 1)
- the required amount of evaporated water per unit time is reduced, or the allowable amount of evaporated water vapor per unit time
- the control operation is performed so as to increase.
- the control amount of each device by this control operation is performed based on the equations (1) to (4) so that the required amount of evaporated water per unit time is equal to the amount of allowable evaporation water vapor per unit time.
- the input of the recovered sand in the recovered sand cooling system Controls and changes the environment, such as volume, water spray, temperature of introduced air, and air volume.
- the environment such as volume, water spray, temperature of introduced air, and air volume.
- each device is controlled according to the operation amount, so that the number of times each device is controlled can be reduced.
- the environment in the recovered sand cooling system is converged by repeating control adjustment of each device and re-measurement by each measuring device in the changed environment as a result.
- the required amount of evaporated water per unit time is smaller than the allowable evaporation amount of water vapor per unit time (state 3), that is, even when the introduced air can sufficiently absorb the water vapor, the required amount of evaporated water per unit time
- the control operation is performed so that the evaporation allowable water vapor amount per unit time becomes equal.
- the amount of cooling sand per unit time can be increased by increasing the input amount of collected sand. Therefore, it becomes possible to cool the recovered sand efficiently.
- Equation (4) to the required evaporation water Q v per unit after adjustment time, and the target moisture cooling recovered sand, by adding the difference of the water recovered sand prior to watering, determine the proper amount of water Is.
- the moisture of the cooled recovery sand is adjusted to about the target moisture, and the moisture content of the cooling recovery sand can be adjusted efficiently.
- the water content and temperature of the cooling recovered sand is different from the target value. This is considered to be the case where the assumed capacity and the actual capacity of the sand cooling device 5 such as the cooling capacity are different from each other.
- the operation correction is performed based on the moisture content and temperature of the cooled recovery sand, and the correction is performed so that the moisture content and temperature of the cooling recovery sand are close to the target. Therefore, even in such a case, the recovered sand can be reliably cooled to the target temperature and hydrated.
- the relative humidity of the introduced air for example, 95% or more, nearly 100% If the value is, for example, the correction amount of any one or any combination of the air volume, the collected sand input amount, and the introduced air temperature to be about 90 to 95% is calculated, and each device is corrected and controlled. Yes. Thereby, it becomes possible to prevent the dew condensation in the sand cooling device 5 and the air duct constituting the air flow path.
- FIG. 7 is a schematic configuration diagram of the recovered sand cooling system 61 shown as a modification of the first embodiment
- FIG. 8 is a block diagram of a control device in the recovered sand cooling system 61.
- the same components as those shown in FIGS. 1 and 2 described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- This embodiment is different from the first embodiment described above in that the humidity of exhaust air is not measured and is calculated, and accordingly, the processing content of the second correction amount calculation unit 67 is Is different.
- the recovered sand cooling system 61 of the present modified example changes the temperature of the exhaust air discharged from the water spray cooling devices 4 and 5 as shown in FIG. 7 instead of the exhaust air temperature and humidity measuring device 16 shown in FIG.
- An exhaust air temperature measuring device 66 for measuring is provided.
- the discharged air temperature measuring device 66 is provided between the sand cooling device 5 and the dust collecting device 14 and measures the temperature of the discharged air discharged from the sand cooling device 5.
- a control device 63 described later is electrically connected to the exhaust air temperature measuring device 66. The temperature of the exhaust air measured by the exhaust air temperature measuring device 66 is transmitted to the control device 3.
- the moisture content and temperature of the recovered sand measured by the sand moisture temperature measuring device 2 the moisture content and temperature of the cooled recovered sand measured by the cooled recovered sand moisture temperature measuring device 20, and the introduction air temperature / humidity measuring device 7.
- the temperature and humidity of the introduced air, the temperature of the discharged air measured by the discharged air temperature measuring device 66, and the air volume of the introduced air measured by the air flow measuring device 17 are transmitted to the control device 63.
- the control device 63 receives these measured values, performs calculations described later, and based on the results, the inverter motor 10 of the belt feeder 9, the water amount adjustment valve 12, the inverter motor 15 of the air introduction device 6, and the air heating The device 13 is controlled.
- the control device 63 performs the three types of processing of determining the proper amount of water addition and instructing watering, correcting the operation based on the moisture content and temperature of the cooled recovered sand, and correcting the operation based on the temperature of the discharged air, thereby recovering the recovered sand cooling system.
- the operation of 61 is controlled.
- FIG. 9 is a flowchart of the recovered sand cooling method shown as the present modified example, which follows the determination of the appropriate water addition amount and the watering instruction in the first embodiment described with reference to FIG.
- the determination of the appropriate water addition amount and the watering instruction shown in FIG. 3 and the operation correction based on the water amount and temperature of the cooling recovered sand shown as step S21 in FIG. Is executed. Since these processes are the same as those in the first embodiment, description thereof will be omitted.
- the operation correction based on the temperature of the exhaust air shown as step S51 which is different from the first embodiment, will be described in detail.
- the operation correction based on the moisture amount and temperature of the cooled recovered sand (step S21) and the operation correction based on the temperature and humidity of the exhaust air (step S41) are performed.
- the right or wrong of execution has been determined by the determination processing in steps S20 and S40.
- these determination processes are not executed, and the operation correction based on the moisture content and temperature of the cooling recovered sand (step S21) and the operation correction based on the temperature of the exhaust air (step S51) are sequentially and sequentially executed. It is the composition which becomes.
- the second correction amount calculation unit 67 uses the temperature of the discharged air discharged by the sand cooling device 5 as a basis.
- the humidity of the discharged air is calculated, and when the humidity of the discharged air is equal to or higher than a predetermined value, a correction amount of any one or a combination of the air volume, the input amount of collected sand, and the temperature of the introduced air is calculated.
- the second correction amount calculation unit 67 receives the temperature of the exhaust air from the exhaust air temperature measuring device 66.
- the second correction amount calculation unit 67 calculates the amount of water held by the exhaust air, and calculates the value of relative humidity at the temperature from the amount of water and the received temperature value of the exhaust air.
- the second correction amount calculation unit 67 calculates the amount of water held by the exhaust air as follows. First, the absolute humidity of the introduced air is calculated from the temperature and humidity of the introduced air measured by the introduced air temperature / humidity measuring device 7, and the air volume of the introduced air measured by the air flow measuring device 17 and the absolute value of the calculated introduced air are calculated. Based on the humidity, the amount of water held by the introduced air per unit time is calculated.
- the amount of water retained by the collected sand per unit time based on the amount of water collected by the sand moisture temperature measuring device 2 and the amount of sand collected per unit time input to the sand cooling device 5
- the sum of the calculated moisture content of the introduced air per unit time and the moisture content of the recovered sand per unit time is calculated, and this sum is supplied to the watering device 4 via the water amount adjustment valve 12. Add up the amount of water supplied per unit time and calculate the sum of these. Thereby, the sum total of the moisture content introduced into the water spray cooling devices 4 and 5 is derived.
- the second correction amount calculation unit 67 is based on the moisture content of the cooling recovery sand measured by the cooling recovery sand moisture temperature measuring device 20 and the cooling recovery sand amount per unit time discharged from the sand cooling device 5. In addition, the amount of water held by the cooling recovery sand per unit time is calculated. The second correction amount calculation unit 67 further subtracts the amount of water held in the cooling recovery sand per unit time from the sum of the amounts of water introduced into the water spray cooling devices 4 and 5 to obtain the amount of water in the exhaust air. calculate. The second correction amount calculation unit 67 calculates the value of the relative humidity at the temperature based on the moisture content of the exhaust air thus calculated and the temperature of the exhaust air.
- the relative humidity of the exhaust air calculated as described above is used as an alternative to the value of the humidity of the exhaust air measured by the exhaust air temperature / humidity measuring device 16 in the first embodiment. That is, in the case where the value of the relative humidity of the exhaust air is a predetermined value, for example, 95% or more and a value close to 100%, dew condensation is generated in the sand cooling device 5 or the air ducts constituting the air flow path. May occur. Therefore, in order to prevent dew condensation, the second correction amount calculation unit 67, like the second correction amount calculation unit 37 in the first embodiment, has an air flow rate due to an increase in the rotational speed of the inverter motor 15 of the air introduction device 6. Correction control such as increase, reduction of input amount of collected sand by reduction of the rotation speed of the inverter motor 10 of the belt feeder 9, increase of set temperature in the air heating device 13, etc. is studied, and control operation is transmitted to the control unit 35.
- each of the above correction amounts is calculated based on the equations (1) to (4) as in the first embodiment.
- the humidity is absolute. Since the humidity is used, the second correction amount calculation unit 67 converts the calculated relative humidity of the discharged air into absolute humidity.
- step S51 the determination of the proper amount of water and the watering instruction method (steps S1 to S14) and the operation correction method (step S21) based on the moisture and temperature of the cooled recovered sand are executed, and then the main correction process described as step S51. I do.
- FIG. 10 shows details of the correction process S51.
- the discharged air temperature measuring device 66 measures the temperature of the discharged air discharged from the sand cooling device 5, and transmits the measurement result to the control device 63 (step S52).
- the second correction amount calculation unit 67 of the control unit 35 receives the temperature of the exhaust air from the exhaust air temperature measuring device 66, and calculates the value of the relative humidity at the temperature (step S53). This is done as follows.
- the absolute humidity of the introduced air is calculated from the temperature and humidity of the introduced air measured by the introduced air temperature / humidity measuring device 7, and the air volume of the introduced air measured by the air flow measuring device 17 and the absolute value of the calculated introduced air are calculated. Based on the humidity, the amount of water held by the introduced air per unit time is calculated. Next, the amount of water retained by the collected sand per unit time based on the amount of water collected by the sand moisture temperature measuring device 2 and the amount of sand collected per unit time input to the sand cooling device 5 Calculate The sum of the calculated moisture content of the introduced air per unit time and the moisture content of the recovered sand per unit time is calculated, and this sum is supplied to the watering device 4 via the water amount adjustment valve 12.
- the cooling recovery sand per unit time is determined based on the moisture content of the cooling recovery sand measured by the cooling recovery sand moisture temperature measuring device 20 and the cooling recovery sand amount per unit time discharged from the sand cooling device 5. Calculate the water content. Furthermore, the moisture content of the cooling recovery sand per unit time is subtracted from the sum of the moisture content introduced into the sprinkler cooling devices 4 and 5 to calculate the moisture content of the exhaust air.
- the second correction amount calculation unit 67 calculates the value of the relative humidity at the temperature based on the moisture content of the exhaust air thus calculated and the temperature of the exhaust air.
- the second correction amount calculation unit 67 determines whether the relative humidity value of the exhaust air calculated as described above is a predetermined value, for example, 95% or more (step S54). This is a process equivalent to step S43 described with reference to FIG. Thereafter, steps S55 and S56 equivalent to steps S44 and S45 in FIG. 6 are sequentially executed.
- this modification has the same effects as those of the first embodiment.
- the humidity of the introduced air is obtained by calculation, so that a hygrometer for measuring the humidity of the discharged air is unnecessary. Since dust and the like are mixed in the exhaust air discharged from the sand cooling device 5, in order to maintain the accuracy of the measured value when a hygrometer for measuring the humidity of the exhaust air is provided. Maintenance work such as periodic hygrometer cleaning is required.
- the configuration of the recovered sand cooling system can be simplified and the cost required for maintenance can be reduced.
- FIG. 11 is a schematic configuration diagram of the recovered sand cooling system 71 shown as the second embodiment of the present invention
- FIG. 12 is a block diagram of a control device in the recovered sand cooling system 71.
- the same components as those shown in FIGS. 1 and 2 described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- This embodiment is different from the first embodiment described above in that the appropriate amount of water added by the controller 73 is determined based on the water content and temperature of the recovered sand and the temperature of the introduced air. . That is, in the second embodiment, when determining the appropriate amount of water, the humidity of the introduced air may not be used.
- the recovered sand cooling system 71 of the second embodiment replaces the introduction air temperature / humidity measuring instrument 7 shown in FIG. 1 and, as shown in FIG. 11, introduces the introduced air introduced into the water spray cooling devices 4 and 5.
- An introduction air temperature measuring device 77 for measuring temperature is provided.
- the humidity of the exhaust air is not used. Therefore, the recovered sand cooling system 71 of the second embodiment is discharged from the sprinkler cooling devices 4 and 5 as shown in FIG. 11 instead of the discharged air temperature and humidity measuring device 16 shown in FIG.
- An exhaust air temperature measuring device 76 for measuring the temperature of the exhaust air is provided.
- the recovered sand cooling system 71 includes the introduced air temperature measuring device 77 and the discharged air temperature measuring device 76 in addition to the air volume measuring device 17 in order to measure the air state in the air flow path described above. Yes.
- the introduced air temperature measuring device 77 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 73 described later is electrically connected to the introduced air temperature measuring device 77. The temperature of the introduced air measured by the introduced air temperature measuring device 77 is transmitted to the control device 73.
- the exhaust air temperature measuring device 76 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 73 described later is electrically connected to the exhaust air temperature measuring device 76. The temperature of the exhaust air measured by the exhaust air temperature measuring device 76 is transmitted to the control device 73.
- Water content and temperature of recovered sand measured by the sand moisture temperature measuring device 2 water content and temperature of cooled recovered sand measured by the cooled recovered sand moisture temperature measuring device 20, and introduction measured by the introduction air temperature measuring device 77.
- the temperature of the air, the temperature of the exhaust air measured by the exhaust air temperature measuring device 76, and the air volume of the introduced air measured by the air volume measuring device 17 are transmitted to the control device 73.
- the control device 73 receives these measurement values, and controls the inverter motor 10 of the belt feeder 9, the water amount adjustment valve 12, the inverter motor 15 of the air introduction device 6, and the air heating device 13 based on the measurement values. .
- control device 73 determines an appropriate amount of water addition based on the water content and temperature of the recovered sand and the temperature of the introduced air, and gives watering instructions. Further, the control device 73 corrects the operation of the system based on the moisture content and temperature of the cooling recovery sand.
- the recovered sand cooling system 71 configured as described above includes a sand moisture temperature measuring device 2 that measures the moisture content and temperature of the recovered sand, and a control device that determines an appropriate amount of water to be added to the recovered sand.
- a sand moisture temperature measuring device 2 that measures the moisture content and temperature of the recovered sand
- a control device that determines an appropriate amount of water to be added to the recovered sand.
- sprinkling cooling devices 4 and 5 which add water of an appropriate amount of water to the recovered sand, cool with water's latent heat of evaporation to form cooled recovered sand
- air introducing devices which introduce air into the sprinkling cooling devices 4 and 5 6 and an introduction air temperature measuring device 77 for measuring the temperature of the air introduced into the sprinkler cooling devices 4 and 5, and the control device 73 is based on the moisture content and temperature of the recovered sand and the temperature of the introduction air. And determine the appropriate amount of water.
- the recovered sand can be cooled to the target temperature regardless of the state of the introduced air.
- FIG. 13 is a schematic configuration diagram of the recovered sand cooling system 81 shown as the third embodiment of the present invention
- FIG. 14 is a block diagram of a control device in the recovered sand cooling system 81.
- the same components as those shown in FIGS. 11 and 12 described in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- This embodiment differs from the second embodiment described above in that the appropriate amount of water added by the control device 83 is determined based on the moisture content and temperature of the recovered sand and the moisture content and temperature of the cooled recovered sand. It is that.
- the sand moisture temperature for measuring the moisture content and temperature of the recovered sand.
- the measuring device 2 a control device 83 for determining an appropriate amount of water to be added to the recovered sand, and adding the appropriate amount of water to the recovered sand and cooling it with the latent heat of evaporation of the water to cool the water Sprinkling cooling devices 4 and 5 to be recovered sand, an air introduction 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 83 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.
- the introduced air temperature shown in FIG. 11 which is a component of the second embodiment.
- the measuring device 77 and the exhaust air temperature measuring device 76 are not provided.
- the same effect as that of the second 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. .
- the air volume was increased, the amount of recovered sand was reduced, and the temperature of the introduced air was increased in this order.
- the order is not limited to this.
- the increase in the temperature of the introduced air may be tried first, or another order may be used.
- the control operation may be determined so as to control three types of devices: the inverter motor 15 of the air introduction device 6, the inverter motor 10 of the belt feeder 9, and the air heating device 13.
- the control operation may be determined so as to control one type or two types of devices.
- Equipment to be controlled such as determination of proper amount of water addition and state 3 of watering instruction, states A and D in the operation correction by the moisture and temperature of the cooled recovered sand, and each processing in the operation correction by the temperature and humidity of the discharged air The same applies to other cases where there are a plurality of.
- the watering device 4 and the sand cooling device 5 are individually arranged, and the hydrolyzed recovered sand that has been hydrated in the watering device 4 is supplied to the sand cooling device 5, but recovered by stirring and mixing.
- a sprinkler cooling apparatus in which these are integrated may be used.
- the air volume in the air introduction device 6 is adjusted by the inverter motor 15, but instead, a damper is provided in the air flow path and the air volume is adjusted by the damper. May be.
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Abstract
Description
図1は、本発明の実施形態として示した回収砂冷却システム1の概略構成図である。回収砂とは、生型鋳造において、鋳型の中に鋳込まれた溶湯金属が凝固した後に、鋳型として使用された砂が鋳物から分離されたものである。回収砂は、異物除去や砂冷却が行われた後に混練調整されて、生型の造型に再度使用される。回収砂冷却システム1は、特に生型鋳型における生型回収砂を冷却し、冷却回収砂の水分を調整するシステムである。
制御装置3は、適正加水量を決定する。このために、制御装置3は、図2に示されるように、必要蒸発水量算出部31、蒸発許容水蒸気量算出部32、適正加水量決定部33、比較演算部34、及び制御部35を備えている。
次に、上記の回収砂冷却システム1を使用した回収砂冷却方法における、適正加水量の決定と散水指示方法を、図1から図4を用いて説明する。本方法は、回収砂を冷却し、冷却回収砂の水分を調整するものである。なお、図2に示される、制御装置3の第1補正量算出部36と第2補正量算出部37の詳細、及びこれらを使用した処理方法については後述する。
次に、冷却回収砂の水分量と温度による動作補正に関する制御装置3の構成について説明する。冷却回収砂の水分量と温度による動作補正を行うために、制御装置3は、図2に示されるように、第1補正量算出部36を備えている。
次に、上記の回収砂冷却システム1における、上記した第1補正量算出部36を使用した、冷却回収砂の水分量と温度による動作補正方法を、図1から図5を用いて説明する。本方法は、図4に記載のステップS21に相当するものであり、適正加水量の決定と散水指示方法において説明した、ステップS1~S20の後に実行されるものである。
次に、排出空気の温度と湿度による動作補正に関する制御装置3の構成について説明する。排出空気の温度と湿度による動作補正を行うために、制御装置3は、図2に示されるように、第2補正量算出部37を備えている。
次に、上記の回収砂冷却システム1の、上記した第2補正量算出部37を使用した、排出空気の温度と湿度による動作補正方法を、図1から図4、及び図6を用いて説明する。本方法は、図4に記載のステップS41に相当し、適正加水量の決定と散水指示方法において説明した、図3におけるステップS1~S14の後に、または、冷却回収砂の水分量と温度による動作補正方法において説明した、ステップS21の後に実行されるものである。
次に、上記第1実施形態の変形例について説明する。
図7は、上記第1実施形態の変形例として示した回収砂冷却システム61の概略構成図であり、図8は、回収砂冷却システム61における制御装置のブロック図である。
これらの図において、第1実施形態で説明した図1、図2に示す構成要素と同一の要素については同一符号を付し、その説明を省略する。
この実施形態が前述した第1実施形態と異なる点は、排出空気の湿度を測定せずに、計算により求めるようにしたことであり、これに伴い、第2補正量算出部67の処理内容が異なっている。
排出空気温度測定器66は、砂冷却装置5と集塵装置14の間に設けられており、砂冷却装置5から排出される排出空気の温度を測定する。排出空気温度測定器66には、後述する制御装置63が電気的に接続されている。排出空気温度測定器66によって測定された排出空気の温度は、制御装置3に送信される。
図9は、本変形例として示した回収砂冷却方法のフローチャートであり、図3を用いて説明した、上記第1実施形態の適正加水量の決定と散水指示の後に続くものである。本変形例においては、上記第1実施形態と同様に、図3に示される適正加水量の決定と散水指示、及び、図9にステップS21として示される冷却回収砂の水分量と温度による動作補正が実行される。これらの処理については、上記第1実施形態と同様であるため、説明を省略する。ここでは、上記第1実施形態とは異なる、ステップS51として示される排出空気の温度による動作補正について詳説する。
本変形例においては、図9におけるステップS21に相当する、冷却回収砂の水分と温度による動作補正の後に、第2補正量算出部67が、砂冷却装置5が排出する排出空気の温度を基に、排出空気の湿度を計算し、排出空気の湿度が所定の値以上の場合に、風量、回収砂の投入量、導入空気の温度のいずれかまたはいずれかの組み合わせの補正量を算出する。
まず、導入空気温度湿度測定器7によって測定された導入空気の温度と湿度から導入空気の絶対湿度を計算し、風量測定器17によって測定された導入空気の風量と、計算された導入空気の絶対湿度を基に、単位時間当たりの導入空気が保有する水分量を計算する。
次に、砂水分温度測定器2によって測定された回収砂の水分量と、砂冷却装置5に投入される単位時間当たりの回収砂量を基に、単位時間当たりの回収砂が保有する水分量を計算する。
計算されたこれらの、単位時間当たりの導入空気が保有する水分量と、単位時間当たりの回収砂が保有する水分量の和を計算し、この和に水量調整弁12を介して散水装置4に供給された単位時間当たりの水量を加算して、これらの総和を計算する。
これにより、散水冷却装置4、5に導入された水分量の総和が導出される。
第2補正量算出部67は、さらに、散水冷却装置4、5に導入された水分量の総和から、単位時間当たりの冷却回収砂が保有する水分量を減算して、排出空気の水分量を計算する。
第2補正量算出部67は、このようにして計算された排出空気の水分量と、排出空気の温度を基に、当該温度における相対湿度の値を算出する。
次に、上記の回収砂冷却システム61の、上記した第2補正量算出部67を使用した、排出空気の温度による動作補正方法を説明する。本方法は、図9に記載のステップS51に相当し、冷却回収砂の水分量と温度による動作補正方法(ステップS21)の後に実行されるものである。
次に、砂水分温度測定器2によって測定された回収砂の水分量と、砂冷却装置5に投入される単位時間当たりの回収砂量を基に、単位時間当たりの回収砂が保有する水分量を計算する。
計算されたこれらの、単位時間当たりの導入空気が保有する水分量と、単位時間当たりの回収砂が保有する水分量の和を計算し、この和に水量調整弁12を介して散水装置4に供給された単位時間当たりの水量を加算して、これらの総和を計算する。
また、冷却回収砂水分温度測定器20によって測定された冷却回収砂の水分量と、砂冷却装置5から排出される単位時間当たりの冷却回収砂量を基に、単位時間当たりの冷却回収砂が保有する水分量を計算する。
さらに、散水冷却装置4、5に導入された水分量の総和から、単位時間当たりの冷却回収砂が保有する水分量を減算して、排出空気の水分量を計算する。
第2補正量算出部67は、このようにして計算された排出空気の水分量と、排出空気の温度を基に、当該温度における相対湿度の値を算出する。
本変形例においては特に、排出空気の温度による動作補正においては、導入空気の湿度を計算によって求めているため、排出空気の湿度を測定するための湿度計が不要である。砂冷却装置5から排出される排出空気には粉塵などが混入しているため、排出空気の湿度を測定するための湿度計を設けた場合においては、測定される値の精度を保つためには、定期的な湿度計の洗浄等の保守作業が必要となる。排出空気の湿度を計算によって求めることにより、回収砂冷却システムの構成を簡潔にするとともに、保守に要するコストを低減することができる。
次に、本発明の第2実施形態について説明する。
図11は、本発明の第2実施形態として示した回収砂冷却システム71の概略構成図であり、図12は、回収砂冷却システム71における制御装置のブロック図である。
これらの図において、第1実施形態で説明した図1、図2に示す構成要素と同一の要素については同一符号を付し、その説明を省略する。
この実施形態が前述した第1実施形態と異なる点は、制御装置73による適正加水量の決定を、回収砂の水分量と温度、及び、導入空気の温度を基に行うようにしたことである。すなわち、本第2実施形態においては、適正加水量を決定するに際し、導入空気の湿度は使用されなくとも構わない。
さらに、本第2実施形態においては、排出空気の湿度を使用しない構成となっている。このため、本第2実施形態の回収砂冷却システム71は、図1に示される排出空気温度湿度測定器16に替えて、図11に示されるように、散水冷却装置4、5から排出される排出空気の温度を測定する排出空気温度測定器76を備えている。
導入空気温度測定器77は、空気加熱装置13と砂冷却装置5の間に設けられており、砂冷却装置5に導入される導入空気の温度を測定する。導入空気温度測定器77には、後述する制御装置73が電気的に接続されている。導入空気温度測定器77によって測定された導入空気の温度は、制御装置73に送信される。
また制御装置73は、冷却回収砂の水分量と温度等に基づいてシステムの動作補正を行う。
次に、本発明の第3実施形態について説明する。
図13は、本発明の第3実施形態として示した回収砂冷却システム81の概略構成図であり、図14は、回収砂冷却システム81における制御装置のブロック図である。
これらの図において、第2実施形態で説明した図11、図12に示す構成要素と同一の要素については同一符号を付し、その説明を省略する。
この実施形態が前述した第2実施形態と異なる点は、制御装置83による適正加水量の決定を、回収砂の水分量と温度、及び、冷却回収砂の水分量と温度を基に行うようにしたことである。
適正加水量の決定と散水指示の状態3、冷却回収砂の水分と温度による動作補正における状態A及びD、及び、排出空気の温度と湿度による動作補正における各処理等の、制御対象となる装置が複数存在する、他の場合についても同様である。
2 砂水分温度測定器
3、63、73、83 制御装置
4 散水装置(散水冷却装置)
5 砂冷却装置(散水冷却装置)
6 空気導入装置
7 導入空気温度湿度測定器
8 ホッパ
9 ベルトフィーダー
10 インバータモータ
11 水源
12 水量調整弁
13 空気加熱装置
14 集塵装置
15 インバータモータ
16 排出空気温度湿度測定器
17 風量測定器
18 ベルトコンベア
19 モータ
20 冷却回収砂水分温度測定器
31 必要蒸発水量算出部
32 蒸発許容水蒸気量算出部
33 適正加水量決定部
34 比較演算部
35 制御部
36 第1補正量算出部
37、67 第2補正量算出部
66、76 排出空気温度測定器
77 導入空気温度測定器
Claims (20)
- 回収砂を冷却し、冷却回収砂の水分量を調整する回収砂冷却システムであって、
前記回収砂の水分量と温度を測定する砂水分温度測定器と、
前記回収砂に加える水の量である、適正加水量を決定する制御装置と、
前記適正加水量の水を前記回収砂に加え、水の蒸発潜熱で冷却して前記冷却回収砂とする散水冷却装置と、
該散水冷却装置に空気を導入する空気導入装置と、
前記散水冷却装置に導入される導入空気の温度と湿度を測定する導入空気温度湿度測定器と、
を備え、
前記制御装置は、前記回収砂の水分量と温度、及び、前記導入空気の温度と湿度を基に、前記適正加水量を決定する、回収砂冷却システム。 - 前記導入空気の風量を測定する風量測定器を備え、
前記制御装置は、前記風量を更に基にして前記適正加水量を決定する、請求項1に記載の回収砂冷却システム。 - 前記制御装置は、
前記回収砂の温度と前記回収砂の投入量を基に、必要蒸発水量を算出する必要蒸発水量算出部と、
前記導入空気の温度と湿度、及び、前記風量を基に、蒸発許容水蒸気量を算出する蒸発許容水蒸気量算出部と、
前記必要蒸発水量と前記蒸発許容水蒸気量を比較し、比較結果を基に、前記風量、前記回収砂の投入量、前記導入空気の温度のいずれかまたはいずれかの組み合わせを制御するための制御操作を決定する比較演算部と、
前記制御操作を実行する制御部と、
を備える、請求項2に記載の回収砂冷却システム。 - 前記必要蒸発水量が前記蒸発許容水蒸気量より大きい場合に、前記制御操作は、前記風量の増加、前記回収砂の投入量の低減、前記導入空気の温度の上昇のいずれかまたはいずれかの組み合わせを行う操作である、請求項3に記載の回収砂冷却システム。
- 前記必要蒸発水量が前記蒸発許容水蒸気量より小さい場合に、前記制御操作は、前記風量の低減、前記回収砂の投入量の増加のいずれか一方または双方を行う操作である、請求項3に記載の回収砂冷却システム。
- 前記制御装置は、前記制御操作後の各々の測定器における再測定値から再度算出された必要蒸発水量を基に、前記適正加水量を決定する適正加水量決定部を備える、請求項4または5に記載の回収砂冷却システム。
- 前記冷却回収砂の水分量と温度を測定する冷却回収砂水分温度測定器を備え、
前記制御装置は、前記冷却回収砂の水分量と温度を基に、前記導入空気の風量、前記回収砂の投入量、前記適正加水量のいずれかまたはいずれかの組み合わせの補正量を算出する第1補正量算出部を備えている、請求項1から6のいずれか一項に記載の回収砂冷却システム。 - 前記散水冷却装置から排出される排出空気の温度と湿度を測定する排出空気温度湿度測定器を備え、
前記制御装置は、前記排出空気の温度と湿度を基に、前記導入空気の風量、前記回収砂の投入量、前記導入空気の温度のいずれかまたはいずれかの組み合わせの補正量を算出する第2補正量算出部を備える、請求項1から7のいずれか一項に記載の回収砂冷却システム。 - 前記散水冷却装置から排出される排出空気の温度を測定する排出空気温度測定器を備え、
前記制御装置は、
前記排出空気の温度を基に前記排出空気の湿度を計算し、
前記排出空気の湿度が所定の値以上の場合に、前記導入空気の風量、前記回収砂の投入量、前記導入空気の温度のいずれかまたはいずれかの組み合わせを補正する、請求項1から6のいずれか一項に記載の回収砂冷却システム。 - 前記冷却回収砂の水分量と温度を測定する冷却回収砂水分温度測定器を備え、
前記制御装置は、前記導入空気の湿度を基にした単位時間当たりの前記導入空気が保有する水分量と、前記回収砂の水分量を基にした単位時間当たりの前記回収砂が保有する水分量と、前記散水冷却装置に供給された単位時間当たりの水量の総和を計算し、該総和から、前記冷却回収砂の水分量を基にした単位時間当たりの前記冷却回収砂が保有する水分量を減算して、前記排出空気の湿度を計算する、請求項9に記載の回収砂冷却システム。 - 前記制御装置は、前記冷却回収砂の水分量と温度を基に、前記導入空気の風量、前記回収砂の投入量、前記適正加水量のいずれかまたはいずれかの組み合わせの補正量を算出する第1補正量算出部を備えている、請求項10に記載の回収砂冷却システム。
- 回収砂を冷却し、冷却回収砂の水分量を調整する回収砂冷却方法であって、
前記回収砂の水分量と温度を測定し、
前記回収砂に加える水の量である、適正加水量を決定し、
前記適正加水量の水を前記回収砂に加え、空気を導入しながら水の蒸発潜熱で冷却して、前記冷却回収砂とし、
導入される導入空気の温度と湿度を測定することを含むものであり、
前記回収砂の水分量と温度、及び、前記導入空気の温度と湿度を基に、前記適正加水量を決定する、回収砂冷却方法。 - 前記導入空気の風量を測定することを更に含み、
前記風量を更に基にして前記適正加水量を決定する、請求項12に記載の回収砂冷却方法。 - 前記回収砂の冷却時に排出される排出空気の温度を測定することを更に含み、
前記排出空気の温度を基に前記排出空気の湿度を計算し、
前記排出空気の湿度が所定の値以上の場合に、前記導入空気の風量、前記回収砂の投入量、前記導入空気の温度のいずれかまたはいずれかの組み合わせを補正する、請求項12または13に記載の回収砂冷却方法。 - 回収砂を冷却し、冷却回収砂の水分量を調整する回収砂冷却システムであって、
前記回収砂の水分量と温度を測定する砂水分温度測定器と、
前記回収砂に加える水の量である、適正加水量を決定する制御装置と、
前記適正加水量の水を前記回収砂に加え、水の蒸発潜熱で冷却して前記冷却回収砂とする散水冷却装置と、
該散水冷却装置に空気を導入する空気導入装置と、
前記散水冷却装置に導入される空気の温度を測定する導入空気温度測定器と、
を備え、
前記制御装置は、前記回収砂の水分量と温度、及び、前記導入空気の温度を基に、前記適正加水量を決定する、回収砂冷却システム。 - 回収砂を冷却し、冷却回収砂の水分量を調整する回収砂冷却システムであって、
前記回収砂の水分量と温度を測定する砂水分温度測定器と、
前記回収砂に加える水の量である、適正加水量を決定する制御装置と、
前記適正加水量の水を前記回収砂に加え、水の蒸発潜熱で冷却して前記冷却回収砂とする散水冷却装置と、
該散水冷却装置に空気を導入する空気導入装置と、
前記冷却回収砂の水分量と温度を測定する冷却回収砂水分温度測定器と、
を備え、
前記制御装置は、前記回収砂の水分量と温度、及び、前記冷却回収砂の水分量と温度を基に、前記適正加水量を決定する、回収砂冷却システム。 - 前記散水冷却装置に導入される導入空気の風量を測定する風量測定器を備え、
前記制御装置は、前記風量を更に基にして前記適正加水量を決定する、請求項15または16に記載の回収砂冷却システム。 - 回収砂を冷却し、冷却回収砂の水分量を調整する回収砂冷却方法であって、
前記回収砂の水分量と温度を測定し、
前記回収砂に加える水の量である、適正加水量を決定し、
前記適正加水量の水を前記回収砂に加え、空気を導入しながら水の蒸発潜熱で冷却して、前記冷却回収砂とし、
導入される空気の温度を測定することを含むものであり、
前記回収砂の水分量と温度、及び、前記導入空気の温度を基に、前記適正加水量を決定する、回収砂冷却方法。 - 回収砂を冷却し、冷却回収砂の水分量を調整する回収砂冷却方法であって、
前記回収砂の水分量と温度を測定し、
前記回収砂に加える水の量である、適正加水量を決定し、
前記適正加水量の水を前記回収砂に加え、空気を導入しながら水の蒸発潜熱で冷却して、前記冷却回収砂とし、
前記冷却回収砂の水分量と温度を測定することを含むものであり、
前記回収砂の水分量と温度、及び、前記冷却回収砂の水分量と温度を基に、前記適正加水量を決定する、回収砂冷却方法。 - 導入される空気の風量を測定することを更に含み、
前記風量を更に基にして前記適正加水量を決定する、請求項18又は請求項19に記載の回収砂冷却方法。
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US16/327,052 US20190193141A1 (en) | 2016-09-14 | 2017-09-07 | Return sand cooling system and return sand cooling method |
BR112019004825A BR112019004825A2 (pt) | 2016-09-14 | 2017-09-07 | sistema de resfriamento de areia de retorno e método de resfriamento de areia de retorno |
KR1020197006889A KR20190044632A (ko) | 2016-09-14 | 2017-09-07 | 회수사 냉각 시스템 및 회수사 냉각 방법 |
EP17850794.3A EP3513887A4 (en) | 2016-09-14 | 2017-09-07 | RECOVERED SAND COOLING SYSTEM AND RECOVERED SAND COOLING METHOD |
MX2019002661A MX2019002661A (es) | 2016-09-14 | 2017-09-07 | Sistema de enfriamiento de arena de retorno y metodo de enfriamiento de arena de retorno. |
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