CN106238672B - The processing equipment and processing method of molding sand - Google Patents
The processing equipment and processing method of molding sand Download PDFInfo
- Publication number
- CN106238672B CN106238672B CN201610374223.3A CN201610374223A CN106238672B CN 106238672 B CN106238672 B CN 106238672B CN 201610374223 A CN201610374223 A CN 201610374223A CN 106238672 B CN106238672 B CN 106238672B
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- sand
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- 239000003110 molding sand Substances 0.000 title claims abstract description 186
- 238000003672 processing method Methods 0.000 title abstract 2
- 239000004576 sand Substances 0.000 claims abstract description 225
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The processing equipment and processing method of present invention offer molding sand.The processing equipment of molding sand has: temporarily storing the sand hopper for the molding sand being supplied to；The sand for carrying the molding sand that sand hopper is arrived in storage carries conveyer；To the watering mechanism for carrying the molding sand watering during conveyer is carried by sand；And cooling sand cooling device is carried out when being stirred to the molding sand after being sprinkled water by watering mechanism, it is assembled in sand hopper: detecting the upper Bu Sha testing agency of the presence or absence of molding sand in upper portion in the sand hopper；Detect the next Bu Sha testing agency of the presence or absence of molding sand in the next portion in sand hopper；And the Zhong Weibu sand testing agency of the presence or absence of molding sand in middle position portion between upper portion and bottom portion in detection sand hopper, the transporting velocity for the molding sand that sand is carried in conveyer is changed based on the signal from Zhong Weibu sand testing agency.
Description
Technical Field
The present invention relates to a sand treatment facility and a sand treatment method that can treat molding sand obtained by decomposing and recovering a mold after casting the mold into a mold and reuse the molding sand for mold molding.
Background
Conventionally, in a sand processing facility, water is appropriately added to molding sand and the molding sand is cooled by a stirring type sand cooling device. The addition of water to the molding sand is performed by measuring the temperature of the molding sand on the conveyor before the molding sand is charged into the sand cooling device and adding water in an amount corresponding to the measured value (see, for example, patent document 1). In addition, conventionally, a belt conveyor having a constant speed has been used as a conveyor before being put into a sand cooling device.
Patent document 1: japanese laid-open patent publication No. 57-171541
However, the amount of the molding sand supplied to the belt conveyor fluctuates due to the sand-iron ratio of the poured mold or the recovery of the molding sand due to a change in the production schedule. If the amount of the molding sand varies in this manner, the stop time of the belt conveyor increases or the frequency of start-stop of the belt conveyor increases depending on the amount of the molding sand supplied to the belt conveyor. Therefore, the amount of the molding sand charged into the sand cooling device is not uniform, and there is a problem that the cooling performance and the uniformity of the moisture of the molding sand are reduced.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object thereof is to provide a sand-treating facility and a sand-treating method capable of improving the cooling performance and the uniformity of moisture of molding sand by equalizing the amount of molding sand charged into a sand-cooling device.
A sand treatment facility according to an aspect of the present invention treats molding sand so that the molding sand can be used for mold formation, and the sand treatment facility includes: a sand hopper for temporarily storing the supplied molding sand; a sand-carrying conveyor for carrying the molding sand stored in the sand hopper; a sprinkling mechanism for sprinkling water on the molding sand during transportation by the sand transportation conveyor; and a sand cooling device for cooling the molding sand sprayed by the water spraying mechanism while stirring the molding sand, wherein the sand hopper is provided with: an upper sand detecting mechanism for detecting the presence or absence of the molding sand in an upper portion of the sand hopper; a lower-position sand detection means for detecting the presence or absence of the molding sand in a lower position in the sand hopper; and a center sand detecting mechanism for detecting the presence or absence of the molding sand in a center portion between the upper portion and the lower portion in the sand hopper, wherein the conveying speed of the molding sand in the sand conveying conveyor is changed based on a signal from the center sand detecting mechanism.
In the sand-handling facility according to another aspect of the present invention, the sand-transporting conveyor is driven by a drive motor whose rotational speed can be changed by an inverter, and the rotational speed of the drive motor is changed by the inverter, thereby changing the transporting speed of the molding sand in the sand-transporting conveyor.
In the sand-handling facility according to still another aspect of the present invention, the amount of water sprayed onto the molding sand during the transportation by the sand-transporting conveyor is changed in accordance with a change in the transportation speed of the molding sand by the sand-transporting conveyor.
In addition, a method for processing molding sand according to an aspect of the present invention is a method for processing molding sand using the above-described equipment, the method comprising: supplying the molding sand to the sand hopper; driving the sand conveyor at a first speed when the lower sand-detecting means detects the presence of the molding sand; driving the sand-conveying conveyor at a second speed higher than the first speed when the middle-position sand-detecting means detects the presence of the molding sand; driving the sand-carrying conveyor at the first speed when the middle-position sand-detecting means detects that the molding sand is absent; and stopping the driving of the sand conveyor when the lower sand detecting means detects the absence of the molding sand.
According to one aspect of the present invention, a sand processing facility for processing sand so that the sand can be used for mold making, comprises: a sand hopper for temporarily storing the supplied molding sand; a sand-carrying conveyor for carrying the molding sand stored in the sand hopper; a sprinkling mechanism for sprinkling water on the molding sand during transportation by the sand transportation conveyor; and a sand cooling device for cooling the molding sand sprayed by the water spraying mechanism while stirring the molding sand, wherein the sand hopper is provided with: an upper sand detecting mechanism for detecting the presence or absence of the molding sand in an upper portion of the sand hopper; a lower-position sand detection means for detecting the presence or absence of the molding sand in a lower position in the sand hopper; and a center sand detecting mechanism for detecting the presence or absence of the molding sand in a center portion between the upper portion and the lower portion in the sand hopper, wherein the conveying speed of the molding sand in the sand conveying conveyor is changed based on a signal from the center sand detecting mechanism. By changing the speed of transporting the molding sand based on the amount of the molding sand supplied to the sand hopper, the amount of the molding sand fed to the sand cooling device can be equalized, and the cooling performance of the molding sand and the uniformity of the moisture can be improved.
Drawings
Fig. 1 is a schematic configuration diagram showing one embodiment.
Fig. 2 is a view from a-a in fig. 1.
Description of reference numerals:
1 … sand hopper; 2 … upper sand detection mechanism; 3 … lower sand detection means; 4 … middle sand detecting mechanism; 5 … sand handling conveyor; 5d … drive motor; 7 … sand cooling device; 13 … a watering mechanism; 18 … frequency converter.
Detailed Description
Embodiments of the equipment and method for treating molding sand according to the present invention will be described in detail below with reference to the drawings. In fig. 1, a sand hopper 1 is disposed in a molding sand processing facility that processes molding sand (green sand in the present embodiment) so as to be usable for mold molding. The molding sand treatment facility in the present embodiment is a facility for treating molding sand, which is obtained by decomposing and recovering a mold after casting the molding sand into a mold and then using the mold again as a mold. Here, the mold decomposition means that the cast mold is disintegrated to separate the mold into a product and molding sand.
The sand hopper 1 temporarily stores molding sand supplied by a sand supply mechanism (not shown) (for example, a belt conveyor or a bucket elevator). Further, the sand hopper 1 is provided with an upper sand detecting means 2 for detecting the presence or absence of molding sand in an upper part of the sand hopper 1 and a lower sand detecting means 3 for detecting the presence or absence of molding sand in a lower part of the sand hopper 1. In the present specification, the "upper portion" refers to an upper portion in the sand hopper 1, and the "lower portion" refers to a lower portion in the sand hopper 1. Further, a middle-position sand detecting mechanism 4 for detecting the presence or absence of molding sand in a middle-position portion, which is a position between an upper-position portion and a lower-position portion in the sand hopper 1, is attached to the sand hopper 1. In the present embodiment, level switches (level switches) are used as the upper sand detection means 2, the lower sand detection means 3, and the middle sand detection means 4, and the vertical positions of the upper sand detection means 2, the lower sand detection means 3, and the middle sand detection means 4 can be adjusted.
A sand conveying conveyor 5 that conveys the molding sand stored in the sand hopper 1 is disposed below the sand storage section 1a of the sand hopper 1, and the sand conveying conveyor 5 is a belt conveyor in the present embodiment. The sand conveyor 5 includes a structure in which a belt 5c is wound around a front end pulley 5a and a rear end pulley 5b, and the belt 5c is moved by rotating the front end pulley 5a by a drive motor 5 d. Power is transmitted to the drive motor 5d and the front end pulley 5a via a sprocket and a chain, not shown.
A chute 6 is connected to a lower portion of the front end pulley 5a of the sand conveyor 5, and a front end of the chute 6 is connected to a side surface of one end of a sand cooling device 7 disposed below the sand conveyor 5. A duct 8 is further connected to a side surface of one end of the sand cooling device 7, and a dust collector 9 is connected to a tip end of the duct 8.
Further, the moisture sensor 10 measures the moisture of the molding sand during the conveyance by the sand conveyance conveyor 5. The temperature sensor 11 measures the temperature of the molding sand during conveyance by the sand-conveying conveyor 5. The sand detection sensor 12 detects the presence or absence of molding sand on the belt 5c of the sand conveyor 5. The moisture sensor 10, the temperature sensor 11, and the sand detection sensor 12 are disposed above the belt 5c, respectively.
A sprinkling mechanism 13 for sprinkling the molding sand during the transportation by the sand transportation conveyor 5 is disposed downstream of the moisture sensor 10 above the belt 5 c. The water spray mechanism 13 is connected to a water pipe 14 in communication therewith, and a base end portion 14a of the water pipe 14 is connected to a water source, not shown. Further, an on-off valve 21, an electromagnetic flow meter 15, and a proportional solenoid valve 16 are incorporated in the water pipe 14.
A stirring mechanism 17 for stirring the molding sand during the conveyance by the sand conveyor 5 is disposed downstream of the sprinkling mechanism 13 above the belt 5 c. The drive motor 5d is electrically connected to the inverter 18, and the rotational speed can be changed by the inverter 18. The lower sand detection mechanism 3 and the middle sand detection mechanism 4 are also electrically connected to the inverter 18, respectively.
The frequency converter 18 is electrically connected to a program device (programmable logic controller) 20 incorporated in a control panel 19. The electromagnetic flowmeter 15 and the proportional solenoid valve 16 are also electrically connected to the sequencer 20.
The sand cooling device 7 will be described in detail. The sand cooling device 7 includes a rotary drum 7a therein. The motor 7b rotates the main shaft 7c, thereby rotating the rotary drum 7a in the direction of the arrow shown in fig. 2. A plurality of stirring members 7d for stirring the molding sand are fixed to the inner circumferential surface of the rotary drum 7 a. The stirring member 7d lifts and drops the molding sand upward, thereby bringing the molding sand into contact with air more and promoting the cooling of the molding sand.
A ventilator 7e is provided on the other end side of the sand cooling device 7, and when air is sucked into the sand cooling device 7 by the dust collector 9, the air is introduced from the ventilator 7 e. A sand discharge port 7f is provided at the bottom of the other end side of the sand cooling device 7, and the molding sand cooled while being stirred in the rotary drum 7a is discharged from the sand discharge port 7 f. The discharged molding sand is sent to the next step through a hopper or chute, not shown.
The operation of the apparatus for treating molding sand thus constructed will be described. First, the sand cooling device 7, the dust collector 9, and the stirring mechanism 17 are operated in advance. Then, the molding sand is supplied into the empty sand hopper 1 from above by a sand supply mechanism not shown. Further, since the sand supply mechanism is intermittently operated, the supply of the molding sand is intermittently performed.
When the molding sand is supplied into the sand hopper 1, the molding sand is gradually stored in the sand hopper 1. As the molding sand is stored in the sand hopper 1, the lower sand detecting means 3 first detects the presence of the molding sand (detects an ON signal of the level switch). After the lower sand detecting means 3 detects the presence of the molding sand and the timer counts a predetermined time (30 seconds in the present embodiment), the drive motor 5d is operated to drive the sand conveyor 5 at the first speed.
The first speed is a speed indicating a relatively low speed and is a speed lower than a second speed described later. Further, a signal indicating that the molding sand detected by the lower sand detecting means 3 is "present" is sent to the frequency converter 18. Based on the signal, the frequency converter 18 sets the rotational speed (rotational speed per unit time) of the drive motor 5d so that the sand conveyor 5 is driven at the first speed. The setting and changing of the rotational speed of the drive motor 5d are realized by setting and changing the frequency of the inverter 18. In the present embodiment, the first speed is 16.5m/min, and the rotation speed of the drive motor 5d at the first speed is 14.8 rpm.
When the sand-conveying conveyor 5 starts to be driven at the first speed, the molding sand in the sand hopper 1 is cut out, and the conveyance of the molding sand by the sand-conveying conveyor 5 starts. Next, after the sand detecting sensor 12 detects that the molding sand is present on the belt 5c, the moisture and temperature of the molding sand during conveyance are measured by the moisture sensor 10 and the temperature sensor 11.
The target moisture and the target temperature of the molding sand discharged from the sand cooling device 7 are determined in advance. Therefore, in order to achieve the target moisture and the target temperature, it is necessary to know how much water needs to be sprayed onto the molding sand during conveyance. The necessary amount of water to be sprayed is calculated by the sequencer 20 based on the measured moisture and temperature of the molding sand during transportation. Then, the opening degree of the proportional solenoid valve 16 is adjusted (changed) based on a command from the sequencer 20. Here, the opening degree of the proportional solenoid valve 16 is adjusted so that the amount of water sprayed from the water spray mechanism 13 becomes the calculated necessary amount of water.
The on-off valve 21 is opened when both conditions of driving the sand conveyor 5 and detecting that the molding sand is "present" by the sand detection sensor 12 are satisfied. Therefore, the water is sprayed from the water spray mechanism 13 to the molding sand being conveyed by the calculated necessary amount of water. Further, the amount of water flowing in the water pipe 14 is measured by an electromagnetic flow meter 15. When the calculated required water spray amount is zero, that is, when water spray is not required, the proportional solenoid valve 16 is closed.
After the sprinkled molding sand is transferred by the sand transfer conveyor 5 by the stirring mechanism 17, the molding sand falls from the front end of the sand transfer conveyor 5 and is supplied into the sand cooling device 7 through the chute 6. The molding sand supplied into the sand cooling device 7 moves forward toward the front end of the rotating drum 7a while being stirred in the rotating drum 7a as the rotating drum 7a rotates. During this time, the atmospheric air is introduced from the ventilator 7e by the suction of the dust collector 9. Thereby evaporating the water, and the molding sand is cooled by its heat of vaporization. The molding sand that has reached the sand discharge port 7f is discharged from the sand discharge port 7f, and is sent to the next step through a bucket or a chute, not shown.
When the molding sand is further stored in the sand hopper 1, the middle-position sand detecting means 4 detects the presence of the molding sand (detects an ON signal of the level switch). After the center sand detecting means 4 detects the presence of the molding sand and the timer counts a predetermined time (10 seconds in the present embodiment), the rotation speed of the drive motor 5d is changed to drive the sand conveyor 5 at the second speed.
The second speed represents a relatively high speed, and is a speed higher than the first speed. The signal indicating that the sand detecting mechanism 4 detects the presence of the molding sand is sent to the frequency converter 18. Based on the signal, the rotational speed of the drive motor 5d is changed by the inverter 18 so that the sand-conveying conveyor 5 is driven at the second speed. In the present embodiment, the second speed is 33.0m/min, and the rotation speed of the drive motor 5d at the second speed is 29.6 rpm.
The amount of water sprayed onto the molding sand during the transportation by the sand transport conveyor 5 can be changed as the transportation speed of the molding sand by the sand transport conveyor 5 is changed. Based on this point, the detailed description will be given. The sequencer 20 calculates the amount of sprinkling required when the sand conveyor 5 is at the second speed based on the signal transmitted from the inverter 18. Then, the opening degree of the proportional solenoid valve 16 is adjusted based on a command from the sequencer 20.
Here, the opening degree of the proportional solenoid valve 16 is adjusted so that the amount of water sprayed from the water spraying mechanism 13 becomes the amount of water to be sprayed when the calculated sand conveyor 5 is at the second speed. Further, the faster the sand conveyor 5 conveys sand, the more the amount of sand conveyed, and therefore the more the amount of water sprinkled is necessary. Further, the lower the conveying speed of the sand conveyor 5, the less the amount of the molding sand to be conveyed, and therefore the less the amount of water to be sprinkled.
Further, if the transportation of the molding sand by the sand transportation conveyor 5 is continued, the molding sand in the sand hopper 1 gradually decreases. The center sand detecting means 4 detects "no" of the molding sand (detects an "OFF" signal of the level switch) in accordance with the decrease of the molding sand. After the middle sand detecting means 4 detects the absence of the molding sand and the timer measures a predetermined time (10 seconds in the present embodiment), the rotation speed of the drive motor 5d is changed to drive the sand conveyor 5 at the first speed.
The signal indicating that the molding sand detected by the middle sand detecting mechanism 4 is "none" is sent to the frequency converter 18. Based on this signal, the rotational speed of the drive motor 5d is changed using the inverter 18 so that the sand conveying conveyor 5 is driven at the first speed.
The amount of water sprayed onto the molding sand during the transportation by the sand conveyer 5 can be changed in accordance with the change in the transportation speed of the molding sand by the sand conveyer 5. The sequencer 20 calculates the amount of water sprinkled when the sand conveyor 5 is at the first speed, based on the signal transmitted from the inverter 18. Then, the opening degree of the proportional solenoid valve 16 is adjusted based on a command from the sequencer 20. Here, the opening degree of the proportional solenoid valve 16 is adjusted so that the amount of water sprayed from the water spraying mechanism 13 becomes the amount of water to be sprayed when the calculated sand conveyor 5 is at the first speed.
When the molding sand in the sand hopper 1 moves near the center sand detecting means 4, the center sand detecting means 4 appropriately detects the presence or absence of the molding sand. In this case, the operation when the aforementioned middle sand detecting means 4 detects the presence of the molding sand and the operation when the middle sand detecting means 4 detects the absence of the molding sand are repeated.
Further, if the sand conveying conveyor 5 continues to convey the molding sand, the amount of the molding sand in the sand hopper 1 is further reduced. The lower sand detecting means 3 detects "no" of the molding sand (detects an "OFF" signal of the level switch) in accordance with the decrease of the molding sand. After the lower sand detecting means 3 detects "no" of the molding sand and the timer measures a predetermined time (3 seconds in the present embodiment), the drive motor 5d is stopped to stop the driving of the sand conveyor 5. The signal indicating that the molding sand detected by the lower sand detecting means 3 is "no" is sent to the inverter 18, and the drive motor 5d is stopped based on the signal. Then, the on-off valve 21 is closed with the stop of the drive motor 5 d.
Further, the upper sand detecting mechanism 2 detects the upper limit of the molding sand stored in the sand hopper 1 so that the molding sand does not overflow from the inside of the sand hopper 1. Therefore, when the upper sand detecting means 2 detects the presence of the molding sand (detects an ON signal of the level switch), the sand supply means for supplying the molding sand to the sand hopper 1 is forcibly stopped.
In the present embodiment, the sand hopper 1 is assembled with: an upper sand detection means 2 for detecting the presence or absence of molding sand in an upper part of the sand hopper 1; a lower sand detecting means 3 for detecting the presence or absence of molding sand in the lower portion of the sand hopper 1; and a middle-position sand detection mechanism 4 for detecting the presence or absence of the molding sand in the middle position located between the upper position and the lower position in the sand hopper 1, wherein the conveying speed of the molding sand in the sand conveying conveyor 5 is changed based on a signal from the middle-position sand detection mechanism 4.
According to the present embodiment, even if the amount of the molding sand collected and supplied into the sand hopper 1 varies, the conveying speed of the molding sand by the sand conveying conveyor 5 can be changed based on the signal from the middle-position sand detection mechanism 4. This can lengthen the operation time of the sand conveyor 5, and can shorten the stop time of the sand conveyor 5. In addition, the frequency of start-stop of the sand conveyor 5 can be reduced. Therefore, the amount of the molding sand charged into the sand cooling device 7 is equalized, and therefore, the cooling performance of the molding sand and the uniformity of the moisture can be improved. Further, since the frequency of start-stop of the sand conveyor 5 is low, there is also an advantage that the load applied to the drive motor 5d is reduced.
In the present embodiment, the sand-conveying conveyor 5 is driven by a drive motor 5d whose rotation speed can be changed by an inverter 18, and the rotation speed of the drive motor 5d is changed by the inverter 18 based on a signal from the middle-position sand detection mechanism 4, thereby changing the conveying speed of the molding sand in the sand-conveying conveyor 5. This configuration has an advantage that the conveying speed of the molding sand in the sand conveyor 5 can be easily changed.
In the present embodiment, the amount of water sprayed onto the molding sand during the transportation by the sand-transporting conveyor 5 is changed in accordance with the change in the transportation speed of the molding sand by the sand-transporting conveyor 5. According to this structure, have following advantage: the amount of the molding sand during the transportation that is changed by the transportation speed of the sand transportation conveyor 5 can be sprayed in an optimum amount, and the uniformity of the moisture content of the molding sand can be further improved.
In the present embodiment, the present invention includes: supplying molding sand to the sand hopper 1; a step of driving the sand-conveying conveyor 5 at a first speed when the lower sand-detecting mechanism 3 detects the presence of the molding sand; a step of driving the sand-conveying conveyor 5 at a second speed higher than the first speed when the middle-position sand-detecting means 4 detects the presence of molding sand; a step of driving the sand-conveying conveyor 5 at a first speed when the center-position sand-detecting means 4 detects that there is no molding sand; and stopping the driving of the sand conveyor 5 when the lower sand detecting means 3 detects that there is no molding sand.
According to the present embodiment, even if the amount of the molding sand collected and supplied into the sand hopper 1 varies, the conveying speed of the molding sand in the sand conveying conveyor 5 can be changed based on the signal from the center-position sand detecting mechanism 4, so that the operation time of the sand conveying conveyor 5 can be increased, and the stop time of the sand conveying conveyor 5 can be shortened. In addition, the frequency of start-stop of the sand conveyor 5 can be reduced. Therefore, the amount of the molding sand charged into the sand cooling device 7 can be equalized, and the cooling performance and the uniformity of the moisture of the molding sand can be improved. In addition, since the frequency of start-stop of the sand conveyor 5 becomes low, there is an advantage that the load applied to the drive motor 5d is reduced.
In the present embodiment, the drive motor 5d is operated or stopped after the lower sand detecting means 3 detects the presence or absence of the molding sand and the timer measures the predetermined time, but the present invention is not limited thereto, and the step of measuring the predetermined time by the timer may be omitted. Further, the rotation speed of the drive motor 5d is changed after the center sand detecting means 4 detects the presence or absence of the molding sand and the timer measures the predetermined time, but the present invention is not limited thereto, and the step of measuring the predetermined time by the timer may be omitted.
In the present embodiment, a belt conveyor is used as the sand conveying conveyor 5, but the present invention is not limited to this, and any other conveyor may be used as long as it is a device capable of conveying the molding sand.
Claims (4)
1. A molding sand processing apparatus for processing molding sand in such a manner that the molding sand can be used for mold molding,
wherein,
the disclosed device is provided with: a sand hopper that temporarily stores the supplied molding sand; a sand-carrying conveyor that carries the molding sand stored in the sand hopper; a sprinkling mechanism for sprinkling water on the molding sand during transportation by the sand transportation conveyor; and a sand cooling device for cooling the molding sand sprayed with water by the water spraying mechanism while stirring the molding sand,
the sand hopper is assembled with: an upper sand detecting mechanism for detecting the presence or absence of the molding sand in an upper portion of the sand hopper; a lower-position sand detection means for detecting the presence or absence of the molding sand in a lower position in the sand hopper; and a middle sand detecting mechanism for detecting the presence or absence of the molding sand in a middle portion of the sand hopper between the upper portion and the lower portion,
the sand-conveying-speed of the molding sand in the sand-conveying conveyor is changed based on a signal from the center-position sand-detecting mechanism.
2. The molding sand handling apparatus according to claim 1,
the sand conveyor is driven by a drive motor whose rotation speed can be changed by an inverter, and the rotation speed of the drive motor is changed by the inverter, thereby changing the conveying speed of the molding sand in the sand conveyor.
3. The molding sand-handling equipment according to any one of claims 1 or 2,
the amount of water sprayed onto the molding sand during the transportation by the sand transport conveyor is changed in accordance with a change in the speed of transporting the molding sand by the sand transport conveyor.
4. A method of treating molding sand using the apparatus for treating molding sand of claim 1,
the method for treating molding sand is characterized by comprising:
supplying the molding sand to the sand hopper; driving the sand conveyor at a first speed when the lower sand detecting means detects the presence of the molding sand; a step of driving the sand-conveying conveyor at a second speed higher than the first speed when the middle-position sand-detecting means detects the presence of the molding sand; driving the sand-conveying conveyor at the first speed when the middle-position sand-detecting mechanism detects that the molding sand is absent; and stopping the driving of the sand conveyor when the lower sand detecting means detects that the molding sand is absent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-118556 | 2015-06-11 | ||
| JP2015118556A JP6380849B2 (en) | 2015-06-11 | 2015-06-11 | Casting sand processing equipment and processing method |
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| Publication Number | Publication Date |
|---|---|
| CN106238672A CN106238672A (en) | 2016-12-21 |
| CN106238672B true CN106238672B (en) | 2019-05-10 |
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| CN201610374223.3A Active CN106238672B (en) | 2015-06-11 | 2016-05-31 | The processing equipment and processing method of molding sand |
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| JP (1) | JP6380849B2 (en) |
| CN (1) | CN106238672B (en) |
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| CN203725694U (en) * | 2013-12-31 | 2014-07-23 | 常州市卓信机电设备制造有限公司 | System for automatically detecting and controlling temperature and humidity of double-disk cooler |
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| JPS5137028A (en) * | 1974-09-24 | 1976-03-29 | Toyoda Automatic Loom Works | IMONOZUNANOREIKYAKUHO |
| JPS57171541A (en) * | 1981-04-13 | 1982-10-22 | Sintokogio Ltd | Treatment of recovered sand |
| JPS5987950A (en) * | 1982-11-12 | 1984-05-21 | Sintokogio Ltd | Method for adjusting moisture in molding sand |
| DE4322947B4 (en) * | 1992-11-27 | 2006-02-02 | Förder- und Anlagentechnik GmbH | Arrangement for improving the processing properties of sands |
| JP3350921B2 (en) * | 1997-04-18 | 2002-11-25 | 新東工業株式会社 | Foundry sand recovery adjustment line |
| JP2007289969A (en) * | 2006-04-21 | 2007-11-08 | Sintokogio Ltd | Rotating drum type sand cooling system |
| JP4900880B2 (en) * | 2008-02-07 | 2012-03-21 | 新東工業株式会社 | Mold making equipment |
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- 2015-06-11 JP JP2015118556A patent/JP6380849B2/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203725694U (en) * | 2013-12-31 | 2014-07-23 | 常州市卓信机电设备制造有限公司 | System for automatically detecting and controlling temperature and humidity of double-disk cooler |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6380849B2 (en) | 2018-08-29 |
| JP2017001064A (en) | 2017-01-05 |
| CN106238672A (en) | 2016-12-21 |
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