JPH0515964A - Device for recoverying molding sand and casting product - Google Patents

Abstract

PURPOSE:To improve the productivity and further and to be used even for the heating dry of molding sand by pulling down the molding sand after casting, taking out a casting product, removing the molding sand stuck to the surface thereof and cooling of the molding sand itself at the same time. CONSTITUTION:One end of a hollow rotary drum 3 is made to a charging part for bulky molding sand and on peripheral wall of the rotary drum 3, a discharging slit 6 for discharging the powdery and granular body of the molding sand and a discharging hole 7 for discharging the casting product included in the molding sand are provided toward the axial direction from the charging end in order. At the discharging hole 7 side, the molding sand and the casting product can be fed and the bulky molding sand is pulled down with the rotation of the rotary drum 3 to make the powdery and granular-state, and the molding sand and the casting product can be recovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to dismantle and cool foundry sand containing foreign matters such as lumps of casting sand and chills after casting, and at the same time take out cast products and foreign matters and cast from the surface thereof. The present invention relates to a recovery processing device that can be extracted while removing sand and that can also be used for drying foundry sand.

[0002]

2. Description of the Related Art In a casting process, casting sand is extracted from a frame after casting, and the casting product is taken out after the operation of dismantling the casting sand. This frame is repeatedly used, and the casting sand is also reused after being cooled and then sent to the polishing process.

The work until the cast product is taken out after casting mainly includes dismantling and removing the casting sand, weir folding for removing the sprue and riser pipe of the casting product, and removal of the casting sand adhering to the casting product. Since the foundry sand is at a high temperature immediately after casting, the removal of the foundry sand from dismantling is a work that takes some time until it is cooled to a certain extent. The removal method is, for example, manual work using a dedicated tool or a dismantling machine that gives vibration to the foundry sand. In addition, the weir folding work is performed by a method in which a person hits the sprue or the riser pipe with a hammer to cut it off or removes it with a cutter. The sand remaining attached to the cast product has a fairly strong adhesion to the surface of the cast product, and is generally removed by the sandblast method.

[0004]

In casting a cast product, the steps of molding with casting sand, casting, disassembling the mold, extracting the product, and reclaiming the casting sand are indispensable. In order to improve the productivity, a large amount of foundry sand is used, and it is required to immediately cool and polish the sand after dismantling so that it can be reused. Further, the weir folding work is time-consuming when extracting the cast product, and the sand blasting process also takes time, so that there is a limit in improving the productivity.

Further, as described above, since the molding sand is also at a high temperature immediately after casting, it cannot be applied for reuse unless it is cooled. For this reason, the cooling time of the molding sand also lengthens the cycle time of reuse, and if it is intended to improve the productivity, a large amount of molding sand must be prepared.

As described above, in conventional casting, not only is the casting product recovered and its surface treated, but the casting sand is also treated separately for reuse, which is an obstacle to improving productivity and reducing the work load. Has become.

Although the molding sand varies depending on the conditions of use, it is supplied to the molding process while containing a certain amount of sticky moisture, whereas it is sent to the molding process without moisture. There are also many. On the other hand, if the equipment is used by removing the moisture from the foundry sand, it may result in molding without sufficient water removal when the reuse cycle is short. In order to remove water from the foundry sand, it is possible to leave it for a long time or to dry it with a heating furnace or the like, but in both cases, there is a problem that the time required for drying is long.

The problem to be solved in the present invention is to dismantle the foundry sand after casting, to extract foreign matters such as a chill used for casting products or casting, and to remove the foundry sand adhering to the surface and the foundry sand. It is an object of the present invention to provide a recovery processing apparatus which improves productivity by simultaneously cooling itself and can be used for heating and drying molding sand.

[0009]

DISCLOSURE OF THE INVENTION The present invention is directed to a hollow rotary drum into which a lump of foundry sand containing a cast product after casting can be loaded from one end in the axial direction, and the rotary drum having a part thereof. And a dust collecting hood that is wrapped around the rotary drum,
It has a structure capable of sending the block of the molding sand from the charging end to the other end side, and a discharge slit having a size capable of flowing out the powder particles of the molding sand on the peripheral wall of the rotary drum from the charging end side. It is characterized in that it is provided up to the middle of the direction and that the other end is provided with a discharge port of a size capable of discharging the cast product.

The rotating drum has a plurality of inner blades inclined to the axis for feeding a mass of foundry sand or the like from the charging end to the outlet side on its inner peripheral surface, and runs on the outer peripheral surface in the axial direction. It is equipped with a plurality of outer blades and is housed by the lower end of the dust collection hood including the outer blades, and a casting from the discharge slit is attached to the lower end of the dust collection hood corresponding to the axial position between the discharge slit and the discharge port. A recovery port for discharging the sand granules to the outside can be provided.

Further, a porous wall having a large number of recovery holes formed in the inner periphery between the discharge slit and the discharge port of the rotary drum is arranged in a double tubular shape together with the inner wall of the rotary drum to form a recovery chamber therein. A recovery path is provided from this recovery chamber to the charging end of the rotary drum, and a number of iron cubes that come into contact with the foundry sand and cast products are circulated from the inside of the rotary drum through the recovery chamber and recovery path by rotating the rotary drum. It can also be circulated as.

Further, it is possible to provide a roller hammer that is hung toward the bottom side of the inner wall of the rotary drum and is rotatable in the circumferential direction of the rotary drum, corresponding to the position of the outlet of the rotary drum.

Further, a burner for heating the inside of the rotary drum may be provided at the charging end of the rotary drum.

[0014]

[Operation] When a lump of foundry sand containing the cast product after casting is loaded into a rotary drum and this rotary drum is rotated, the lump of foundry sand rolls while hitting the inner peripheral wall of the rotary drum. repeat. Therefore, the foundry sand gradually collapses from its peripheral surface, and the foundry sand is dismantled and removed from the cast product. Then, due to the structure capable of being fed as the rotary drum rotates, the granular material of the foundry sand and the cast product gradually move to the discharge port side. During this time, the foundry sand becomes granular due to the complicated motion due to the rotation of the rotary drum, at which time it is discharged from the discharge slit to the outside, and the cast product is collected from the discharge port to the outside.

If a plurality of blades running in the axial direction are provided on the inner and outer circumferences of the rotary drum, the foundry sand is lifted up by the blades on the inner circumference and falls again in the rotary drum. exercise. Further, the molding sand flowing out from the discharge slit is also scraped up by the outer blade, and then flows from the outside through the discharge slit into the rotary drum again,
In this, a downward flow occurs. Therefore, the molding sand is frequently contacted with air, and the high-temperature molding sand is sufficiently cooled. At this time, since steam is generated from the foundry sand, the cooling of the foundry sand is greatly promoted by utilizing the vaporization heat.

Further, if the iron cube is circulated in the rotating drum by the collecting chamber and the collecting passage provided in the rotating drum, the iron cube frequently contacts the foundry sand and the cast product. Therefore, the polishing of the foundry sand and the separation of the foundry sand adhering to the cast product are promoted. Then, when the foundry sand gradually becomes grains, the foundry sand is crushed into sand grains by the impact of the iron cube, and the agglomeration of sand is also promoted.

Further, if a roller hammer is provided at the outlet of the cast product so as to be swingable in the circumferential direction of the rotary drum, the roller hammer is temporarily turned upward by utilizing the complicated motion of the cast product due to the rotation of the rotary drum. Move. Since the roller hammer naturally hangs on the bottom side of the inner wall of the rotary drum, it tries to return to this state. Therefore, the roller hammer hits the cast product, whereby the sprue and riser pipe can be broken to perform a weir folding operation.

Further, if a burner is installed at the charging end of the rotary drum and the molding sand or a mass thereof is charged inside the rotating drum, the molding sand is crushed by heating the burner to be granulated and simultaneously the molding sand is dried. Can be made.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway front view of an apparatus for recovering foundry sand and cast products according to the present invention, FIG. 2 is an overall perspective view, FIG. 3 is a perspective view showing the left end portion of FIG. 1, and FIG. It is the figure which looked at the rotary drum from the charging end side.

The recovery processing device has a dust collecting hood 2 arranged above the base 1, a rotary drum 3 partially housed in the dust collecting hood 2, and a drive system for driving the rotary drum 3 as main elements. It is composed. In the example,
The axis of the rotary drum 3 is slanted in order to accelerate the sending of the lump of foundry sand charged into the rotary drum 3 to the downstream side.

The dust collecting hood 2 is housed so as to embrace the portion other than the right end side of the rotary drum 3 and has an opening 2a which covers only the upper portion of the rotary drum 3 on the right end side. Then, a duct 2b is attached to the upper end of the dust collecting hood 2 and connected to a suction blower (not shown) to collect dust generated when the rotary drum 3 rotates.

The rotary drum 3 is a hollow cylinder whose one end is open, and the outer peripheral surface on the open end side is rotatably supported by the receiving roller 1b of the post 1a raised on the base 1. A drive shaft 4 supported by two bearings 4a is coaxially connected to the other end of the rotary drum 3. And
The base 1 is provided with a drive motor 5, and its output shaft and drive shaft 4 are connected by a chain 5a. The drive motor 5 is of an inverter type because the rotation speed of the rotary drum 3 is variable.

The portion where the rotary drum 3 is housed in the dust collecting hood 2 collects the molding sand while cooling it, and the portion on the right side of this part functions to collect the casting product. For this reason, a large number of discharge slits 6 are provided in the portion held by the lower end of the dust collecting boom 2, and a discharge port 7 having a large square opening shape is formed in the right end.

FIG. 5 is a vertical sectional view taken along the line AA in FIG. 1, in which eight openings 3a are opened in the circumferential direction on the peripheral wall of the rotary drum 3, and these openings 3a are arranged in four rows in the axial direction. It is provided. Then, rods 6a having a quadrangular cross section are fixed inside the opening 3a at regular intervals in the axial direction, and a discharge slit 6 is formed by a gap between these rods 6a. In addition, in FIG. 5, for the sake of clarity,
Although the width of the discharge slit 6 is drawn large, if the outer diameter of the rotating drum 3 is about 1500 mm, the rod 6
a has a rectangular cross section with a side length of 30 mm,
The width of the discharge slit 6 is preferably about 3 to 7 mm. Further, at a position avoiding the opening 3a, the rotary drum 3
An inner blade 8 and an outer blade 9 are provided on the inner peripheral side and the outer peripheral side, respectively. The inner blade 5 has a posture inclined with respect to the axis of the rotary drum 3 in order to send the lump of the foundry sand that has been charged, the foundry sand that is dismantled and turned into sand grains, and the iron cube described below to the discharge port 7 side, On the other hand, the outer blade 9 is provided so as to run in the axial direction. A lid 2e for maintenance and inspection is provided at the bottom of the dust collecting hood 2 corresponding to the lower end of the rotary drum 3 by a hinge 2f so as to be openable and closable so that periodical cleaning and foreign matter discharge can be performed.

Four rows of openings 3a are provided on the peripheral wall of the rotary drum 3.
Between the row of the openings 3a located on the rightmost side and the row of the discharge ports 7 as shown in FIG. 6 (a vertical sectional view taken along the line BB in FIG. 1), the inner diameter is slightly reduced. A porous wall 10 is provided, and a recovery chamber 11 having an annular cross section for recovering an iron cube for polishing is formed between the porous wall 10 and the peripheral wall of the rotary drum 3. The iron cube has been conventionally used in a turn blast method or the like, and it has a role of peeling off the foundry sand by adhering it to the surface of a cast product. Then, in order to improve the stripping effect, for example, a cubic body having one side of 15 to 20 mm is used, and the recovery hole 10a opened in the porous wall 10 allows the iron cube to escape and be discharged to the recovery chamber 11. The inner diameter is about 30 mm.

FIG. 7 shows the inside of the rotary drum 3, and utilizing the rotation of the rotary drum 3, the iron cube collecting chamber 1
It is a figure for showing the collection way 12 for returning from 1 to the charging end side.

The recovery chamber 11 provided in an annular shape is provided with a partition wall 11a for partitioning the internal space thereof in the circumferential direction, and the recovery passage 12 is connected to this partition wall 11a. Partition wall 11a
As shown in the figure, the charging end side is provided so as to be inclined so as to intersect the axis of the rotary drum 3 and face downward. Further, the recovery passage 12 is a box-shaped one end of which is communicated with the recovery chamber 11 and the other end of which is opened before the loading end of the rotary drum 3. Of the two walls partitioning the recovery passage 12 in the circumferential direction, the wall at the position opposite to the rotating direction of the rotating drum 3 shown by the arrow in the drawing is the inclined wall 12a, and the inclined wall 12a rotates. It is inclined in the same direction as the partition wall 11a with respect to the axis of the drum 3. A large number of small holes 12b are formed in the member forming the recovery passage 12 so that the foundry sand can enter and leave the rotary drum 3 through the inside so that the foundry sand comes into contact with the iron cube when the foundry sand passes. To Further, the iron cube returned from the recovery path 12 to the charging end side is the rotating drum 3
A flange 3b is provided at the charging end of the rotary drum 3 so that the flange 3b does not flow out. The recovery passages 12 are provided at two locations on the inner circumference of the rotary drum 3.

The recovery chamber 11 and recovery path 1 as described above
Due to the structure of No. 2, when the rotary drum 3 rotates in the direction of the arrow in the figure, the inclination of the rotary drum 3 causes the iron cube to flow toward the porous wall 10 side like the casting sand and the cast product, and the recovery hole 10a formed in this. Flow into the recovery chamber 11. Then, the iron cube moves so as to flow in the opposite direction to the rotation direction of the rotating drum 3, so that the iron cube gradually accumulates in the communication portion with the recovery passage 12 and flows into the recovery passage 12. The iron cube is returned to the charging end side by the rotation of the rotary drum 3 by the inclined wall 12a provided in the recovery path 12, and flows out into the rotary drum 3 from the open end of the recovery path 12. After that, the iron cube flows toward the porous wall 10 side while contacting the molding sand and the casting product,
Similarly, it will circulate through the recovery chamber 11 and the recovery path 12.

Further, as shown in FIG. 5, a recovery port 2c for recovering foundry sand is opened at the lower end of the casing of the dust collecting hood 2 in the portion corresponding to the position of the porous wall 10. A guide 2d is provided at the recovery port 2c, and a chute 15 for discharging the casting sand to a belt conveyor (not shown) for sending the casting sand to the casting step for reuse is connected to the lower end of the guide 2d. The chute 15 is provided with a vibrating screen 15a on its upper surface, and while vibrating the casting sand that flows in, it selects fine and coarse sand and sends it to the belt conveyor. The vibrating screen 15a is generally used for handling powder and granules, and may be any one that can generate appropriate vibrations due to rotation of the eccentric body or the like.

Porous wall 10 and outlet 7 for collecting cast products
Between the rib 1 and the rib 1 having a smaller inner diameter as shown in FIG.
6 is provided. The ribs 16 are all shot sand made of foundry sand.
It is possible to discharge the iron cube from the discharge chamber 7 and to collect the iron cube into the recovery chamber 11 without overflowing to the discharge port 7 side.

Inside the right end of the rotary drum 3, the drive shaft 4
A roller hammer 17 directly connected to is provided. FIG. 8 is a vertical cross-sectional view showing the details of the roller hammer 17. A retainer block 17b is rotatably provided on the drive shaft 4 via a bearing 17a, and the retainer block 17b has a bearing 17c.
Thus, the rod 17d is provided in a posture parallel to the drive shaft 4, that is, parallel to the axis of the rotary drum 3. A plurality of disc-shaped weights 17e are exchangeably fixed to the rod 17d. This weight 17e
The outer diameter and the number to be incorporated may be changed according to the size and shape of the cast product to be treated.

In the above construction, the lump of foundry sand extracted from the frame after casting is put into the rotary drum 3 from the chute 3c with the cast product contained therein as shown in FIG. At this time, not only one lump of foundry sand but also an appropriate number can be charged according to the capacity of the rotating drum 3, and a plurality of lumps of foundry sand can be processed at the same time. Further, an appropriate amount of iron cubes are loaded in the rotary drum 3 in advance according to the amount of foundry sand.

Next, the drive motor 5 is operated to change the number of revolutions according to the size and amount of the lump of foundry sand charged, and the drive shaft 4 rotates the rotary drum 3. Rotating drum 3
7 is as shown in FIG. 7, and is counterclockwise when viewed from the charging end side, and is clockwise when viewed from the drive shaft 4 side. Due to the rotation function of the rotary drum 3 and the feed function by the inclination of the inner blades 8, the injected casting sand lumps gradually move to the right side in FIG. 1 and hit the inner wall of the rotary drum 3 to repeat rolling. Due to the rolling of such lumps, the peripheral surface gradually collapses, and gradually becomes grains of foundry sand. Then, the inner blades 8 of the rotary drum 3 not only have the function of feeding, but also scrape up the molding sand accumulated at the bottom of the rotating drum 3 up to a certain angle. Fall from top to bottom. At the same time, a lump of foundry sand is also lifted up by the inner blade 8 and rolls in the rotary drum 3 to move around in a complicated manner, and this movement promotes disassembly of the foundry sand. Of course, the iron sand that is mixed in is also used to scrape the foundry sand away from the cast product.

Since the molding sand gradually becomes smaller, those smaller than the width of the discharge slit 6 come out of the rotary drum 3 and flow down to the bottom of the casing of the dust collecting hood 2. On the other hand, since the outer blade 9 is provided on the outer periphery of the rotary drum 3, the casting sand that has flowed out is moved upward as the outer blade 9 scrapes up. And
When the foundry sand is carried to the upper end side of the outer peripheral surface of the rotating drum 3, it is again discharged from the discharge slit 6 due to its own weight.
Run into.

In this way, the foundry sand scraped off is not immediately discharged from the discharge slit 6, but the inner blade 8
And by the action of the outer blades 9, the downward movement in the rotary drum 3 is repeated. Therefore, the peeled foundry sand is not immediately discharged, but the number of times it contacts the air in the rotary drum 3 increases, and the sand is cooled during this period. During this cooling, the foundry sand is quite hot and contains moisture, so that when it comes into contact with the air, steam is generated. Therefore, the heat of vaporization due to the generation of water vapor is removed, and the foundry sand is efficiently cooled.

Further, during the operation of the rotary drum 3, the iron cube also comes into contact with the cast product that has been exposed because the molding sand has been peeled off, and the molding sand also repeatedly touches the iron cube. Since both the iron cube and the cast product move intricately in the rotary drum 3, the iron cube comes into contact with the surface of the cast product at various angles, and the molding sand adhering to the surface can be stripped off. At the same time, the foundry sand is also rubbed by the iron cubes, so that the foundry sand is also polished. Further, when the foundry sand is gradually turned into sand grains, if it becomes a lump of a certain size or smaller, even if it moves such that it falls by its own weight, its mass is small, so that the grain formation does not proceed. On the other hand, since the iron cubes contact or hit the lump of the molding sand many times, the lump of the molding sand which has become smaller can be crushed into sand grains, and the molding sand can be reused as it is.

The foundry sand thus peeled off and cooled forms a flow of powder and granules inside the rotary drum 3 as shown in FIG.
Move to the right at. Then, the foundry sand has a recovery port 2c.
When flowing out to the portion, as shown in FIG. 5, the outer blade 9 scrapes up the molding sand and discharges it toward the outside, and the particles of the molding sand are directly discharged from the recovery port 2c to the outside. The particles of the foundry sand discharged are the vibrating screen 15 of the chute 15.
The particle size is selected by a and sent to a molding process by a belt conveyor for reuse.

The dust generated in the process of separating and cooling the foundry sand as described above is discharged from the dust collecting hood 2 to the duct 2b.
After that, fine powder is prevented from being scattered during the operation.

On the other hand, since the iron cube has a size that does not come out of the discharge slit 6, the iron cube gradually moves to the right side in FIG. 1 along with the flow of foundry sand or cast product as the rotary drum 3 rotates. Then, when the iron cube reaches the porous wall portion 10, the recovery hole 10a opened therein has a larger opening diameter than the iron cube, so the iron cube is discharged to the recovery chamber 11. Since the rib 16 projects from the end of the porous wall 10, the iron cube does not flow out to the discharge port 7 side and is entirely collected in the collection chamber 11. Then, as described above, the iron cube is naturally moved to the charging end side of the rotating drum 3 in order by utilizing the action of the inclined wall 12a of the recovery passage 12 and the rotating direction of the rotating drum 3 as shown in FIG. To go. After that, the iron cube exiting the recovery path 12 flows toward the porous wall 10 while being mixed with the molding sand or the casting product again due to the inclination of the rotary drum 3, and repeats contact with the casting product and the casting sand. Furthermore, since many small holes 12b are opened in the wall of the recovery passage 12,
Grains of foundry sand enter and leave the recovery passage 12. For this reason, since the molding sand is sent to the portion where the flow density of the iron cube is high, the grinding and crushing of the molding sand by the iron cube are efficiently performed.

As the rotary drum 3 continues to rotate, the cast product gradually shows its contour, and the tilted rotary drum 3 moves to the discharge port 7 side while rolling. On the other hand, since the roller hammer 17 is connected to the drive shaft 4 by the bearing 17a, the weight 17c
Due to the weight of the retainer block 17b, the retainer block 17b does not rotate and remains in the posture shown in FIG. Therefore, when the cast product moves to the portion of the discharge port 7, the rotary drum 3 continues to rotate counterclockwise as shown in FIG. 4, so if the cast product rolls on the left side of the roller hammer 17, the rotary drum 3 The rotation of the roller causes the cast product to push the roller hammer 17 counterclockwise. Therefore, the retainer block 17b of the roller hammer 17 also rotates and the weight 1
7d moves upward. Then, when the rotary drum 3 continues to rotate further, the weight of the weight 17d causes the retainer block 17b to return to its original posture, and the roller hammer 17 momentarily rotates until it takes the posture of FIG.

Thus, the cast product is the roller hammer 17
After touching the weight 17d, when the rotation drum 3 comes into engagement with the weight 17d, the roller hammer 17 also rotates. And roller hammer 1
When the balance of 7 is lost, the weight 17d rotates downward, which strongly hits the cast product. Therefore, when the weight 17d hits the sprue or the riser pipe protruding outside the cast product, the impact causes the sprue or the riser pipe to be broken.

The movement of the roller hammer 17 changes intricately depending on the shape and size of the cast product, the moving direction to the discharge port 7, and the like. For this reason, the weight 17d may not hit the sprue or the riser pipe by one hit with the roller hammer 17. For this reason, if the gate 7 or the feeder tube is still attached to the cast product, if the outlet 7 is appropriately sized, the weight 17d may hit the cast product several times to cause the gate or pusher to be pressed. You can break the water pipe. In this way, the rotation of the rotary drum 3 is continued, the roller hammer 17 repeatedly hits the cast product, and after breaking the gate and the riser pipe, the cast product can be recovered from the discharge port 7. Also,
The roller hammer 17 not only breaks the sprue and riser pipe,
It also acts to kick out the cast product from the discharge port 7 when it is hit, and to take it out.

As described above, by using the roller hammer 17, the cast product can be taken out as a product without the sprue and the riser pipe. For this reason, in the past, a manual weir folding step was required after removing the molding sand from the casting product, but this step is unnecessary. Therefore, the cast product is recovered in a state where the casting sand on the surface has been removed to some extent by the iron cube and the sprue and the like have been removed at the same time. Therefore, not only the working time in the sandblasting process for removing the foundry sand that is still adhering is shortened, but also the work load is greatly reduced because the weir folding is unnecessary.

FIG. 9 is a vertical cross-sectional view of a main part showing another example of the roller hammer.

In the figure, similarly to the example of FIG. 7, a retainer block 18b is rotatably attached to the drive shaft 4 via a bearing 18a, and a rod 18d is rotatably attached to the retainer block 18b by a bearing 18c. There is. The rod 18d is attached in an oblique posture with its tip end inclined to the axis of the rotary drum 3 so as to intersect the axes of the drive shaft 4 and the rotary drum 3. A cylindrical magnet 18e using a permanent magnet having an outer diameter substantially the same as that of the weight 17e in FIG. 7 is fixed to the rod 18d.

In the roller hammer 18 having such a structure,
It is suitable for treating only foundry sand rather than weir folding work. For example, since the foundry sand remaining after extracting the cast product from the foundry sand also contains a lump of iron such as chilled gold, if such a foreign substance is adsorbed by the magnet 18e and collected, It is possible to collect foreign matter and process molding sand at the same time. In this work, iron lumps such as chills, sprues and riser pipes are separated from the foundry sand and gradually adsorbed by the magnet 18e. At this time, in FIG. 9, when iron is attached to the upper surface of the tip of the magnet 18e, the balance is lost and the attracted surface of the rod 18 faces downward.
d rotates. Then, since the magnet 18e also swings by the rotation of the rotary drum 3, the adsorbed iron component gradually shifts downward in FIG. 8, and finally falls by its own weight and is ejected from the ejection port 7. Furthermore, the structure of the rotary drum 3 of the recovery processing device of the present invention can be used not only for the treatment of cast products and cooling recovery of foundry sand, but also for the drying of foundry sand. 11 to 13 show an example having this drying function, the same components as those described above are designated by common reference numerals, and detailed description thereof will be omitted.

A lid 20 is attached to the charging end side of the rotary drum 3, and the inside thereof is a base material. The lid 20 is provided with a casting sand feeding hopper 21 and a burner 22 for drying. The rotating drum 3 differs from the above example in that the discharge port is made smaller in the illustrated example. That is, the configuration in which a large number of discharge slits 6 are provided by the rod 6a, the inner blade 8 and the outer blade 9 are provided, and the drive shaft 4 is rotated is the same as that of the above example. In the illustrated example, the porous wall for circulating the iron cube, the recovery chamber, and the recovery path are not provided, but the same structure as that of the above example may be incorporated. Further, in the figure, at the lower end portion of the dust collecting hood 2, a recovery port 2c is opened at a position similar to that shown in FIG. 5, and a guide 2d for discharging the treated foundry sand flowing out from the recovery port 2c is provided. (FIG. 10). Then, recovery hoppers 23b and 23c provided with a vibrating screen 23a are provided below the guide 2d, and the hoppers 23b and 23c are used to sort by the grain size of the foundry sand. Further, at one end of the rotary drum 3, a discharge port 24 for discharging mixed iron scraps and the like is opened,
A chute 25 is provided at the lower end of the dust collecting hood 2 in accordance with the position of the discharge port 24.

The foundry sand charged in the rotary drum 3 is
By the rotation of the rotary drum 3, as described above, the motion of being fed up in the rotary drum 3 and then falling down is repeated. Then, the burner 22 heats the molding sand that moves around in this way, efficiently dries it in a short time, and discharges it from the recovery port 2c through the guide 2d.

The foundry sand may be either demolition-treated or lumped. In the case where the dismantled molding sand is granular, it escapes from the discharge slit 6 of the rotary drum 3, which is brought up by the outer blades 9 in the same manner as described above, and then returns to the inside of the rotary drum 3 from above. Run down. Therefore, the contact between the foundry sand and the air is repeated, heat transfer by the burner 22 is sufficiently promoted, and efficient drying is possible. When a lump of foundry sand is thrown into the rotary drum 3, the lump rolls in the rotary drum 3 and is gradually scraped into particles by contact with the inner wall of the rotary drum 3. Further, due to the interference of the inner blades 8, the lumps are crushed and can be granulated as in the above example. Therefore, like the drying of the foundry sand after dismantling, the lumps can be granulated and dried at the same time.

By providing the burner 22 in this way,
The molding sand can be dried at the same time as the crushing, and since the molding sand is fluidized, the contact area with the hot air also increases, so that the molding sand can be surely dried in a short time.

Further, if the rotary drum 3 is provided with an iron cube circulation system, the molding sand can be more efficiently dried. That is, the porous wall 10 as shown in FIG.
Rotating drum 3 with recovery chamber 11 and recovery path 12
By rotating the iron cube by rotating
The temperature of the iron cube also rises due to heating by the burner 22, and the foundry sand that touches this iron cube is heated. For this reason, not only the drying by the hot air from the burner 22 but also the heat transfer by the iron cube can be used, so that the molding sand can be efficiently dried.

In the embodiment, the rotary drum 3 is rotated by the drive motor 5 via the drive shaft 4, but instead of this, the peripheral surfaces of both ends of the rotary drum 3 are received by a plurality of bearings. It may be supported by the roll 1b, and a chain may be wound around the peripheral surface of the rotary drum 3 to be driven by a motor. In this case, the rotary drum 3 can have not only the charging end opened but also the other end opened, from which the cast product can be discharged and the discharge product is discharged from the discharge port 7.
It is not necessary to provide the like. Also, the roller hammers 17 and 18
The boss may be provided in the rotary drum 3 in a cross shape and supported at the center of the boss.

[0053]

According to the present invention, it is possible to dismantle the molding sand and to cool and recover the molding sand simply by loading the mold of the molding sand after casting into the rotary drum as it is. it can. Therefore, not only the casting product can be recovered but also the molding sand can be treated at the same time, so that the molding sand can be immediately reused and the molding cycle can be shortened. Further, since the weir folding work can be omitted, the work load is reduced and at the same time the productivity is greatly improved. Further, when the burner is incorporated into the rotary drum, the foundry sand or the lump thereof can be efficiently dried, which is extremely excellent as a facility for treating foundry sand. Further, not only cast products but also sand gates and riser pipes that have been folded over can remove sand adhering to the surface by the iron cubes, so that when these are reused, melting can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a cutaway front view of a casting sand and cast product recovery processing apparatus according to the present invention.

FIG. 2 is a perspective view of the recovery processing device as viewed from the right side of FIG.

3 is a perspective view showing a left end portion of the recovery device in FIG. 1. FIG.

FIG. 4 is a view of the inside of the rotary drum as seen from a charging end.

5 is a longitudinal sectional view taken along the line AA of FIG.

6 is a vertical sectional view taken along the line BB of FIG.

FIG. 7 is a perspective view of a main part inside the rotating drum, showing a structure for collecting and circulating an iron cube.

FIG. 8 is a vertical cross-sectional view of a main part showing a structure of a roller hammer.

FIG. 9 is a vertical cross-sectional view of a main part showing another example of the roller hammer.

FIG. 10 is a perspective view of the entire apparatus showing an example in which a burner is attached to a rotary drum and is used for drying foundry sand.

11 is a cutaway front view showing the internal structure of the apparatus of FIG.

12 is a vertical cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

1 base 2 Dust collecting hood 3 rotating drums 4 drive shaft 5 drive motor 6 discharge slit 7 outlet 8 inner blades 9 outer blades 11 Recovery chamber 12 Collection route 15 shoots 16 ribs 17 Roller Hammer 18 Roller hammer 20 lid 21 Input hopper 22 burners

Claims (5)

[Claims] 1. A hollow rotary drum into which a lump of foundry sand containing a cast product after casting can be loaded from one end in the axial direction,
A dust collecting hood that encloses the rotary drum except for a part thereof, wherein the rotary drum has a configuration capable of sending the lump of the foundry sand to the other end side from a charging end, and is provided on a peripheral wall of the rotary drum. A discharge slit having a size that allows the sand and sand particles to flow out is provided from the charging end side to a midpoint in the axial direction, and the other end has a discharge port having a size capable of discharging the cast product. An apparatus for recovering and processing foundry sand and cast products. 2. The rotating drum has a plurality of inner blades inclined with respect to an axis for feeding the lump of the molding sand or the like to the inner peripheral surface thereof from the charging end toward the discharge port side, and the outer periphery. A plurality of outer blades running in the axial direction on the surface, the lower blade of the dust collecting hood including the outer blades is accommodated, and the lower end of the dust collecting hood corresponding to the axial position between the discharge slit and the discharge port. 2. The apparatus for collecting and processing foundry sand and cast products according to claim 1, wherein the part is provided with a recovery port for discharging the powdery particles of the foundry sand from the discharge slit to the outside. 3. A perforated wall having a large number of recovery holes formed in the inner periphery between the discharge slit and the discharge port of the rotary drum is arranged in a double tubular shape together with the inner wall of the rotary drum and the inside thereof is a recovery chamber. A recovery path is provided from the recovery chamber to the charging end of the rotary drum, and a large number of iron cubes that come into contact with the foundry sand and the cast product are recovered from the interior of the rotary drum by rotation of the rotary drum. 2. The apparatus for recovering and processing foundry sand and cast products according to claim 1, wherein the recovery path and the recovery path can be circulated. 4. A roller hammer, which is hung toward the bottom side of the inner wall of the rotary drum and is rotatable in the circumferential direction of the rotary drum, is provided corresponding to the position of the discharge port of the rotary drum. The apparatus for collecting and treating foundry sand and cast products according to claim 1. 5. The apparatus for collecting and treating foundry sand and cast products according to claim 1, wherein a burner for heating the inside of the rotary drum is provided at a charging end of the rotary drum.