KR100985359B1 - Regenerating equipment of molding sand with eccentricity vibration apparatus - Google Patents

Abstract

PURPOSE: A casting sand recycling facility with an eccentricity vibration device is provided to finely grind a lump of casting sand by protrusion pins, thereby increasing grinding efficiency. CONSTITUTION: A casting sand recycling facility includes the following units. A grinding device(100) grinds casting sand. A selector(400) separates metal from ground casting sand. A cooling device(300) cools casting sand from which metal is separated. A sand recycling device(500) removes chemical materials from the surface of cooled casting sand. A transfer device(600) transfers the casting sand from which the chemical materials are removed.

Description

Regenerating equipment of molding sand with eccentricity vibration apparatus

The present invention, using the eccentric shaft member having an eccentric belt shaft and the eccentric belt shaft and the eccentric vibrating device connected to the belt to perform the first crushing and second crushing, but to increase the vibration displacement, evenly distribute the vibration to the grinding speed and efficiency The present invention relates to a casting sand regeneration facility equipped with an eccentric vibration device.

In general, in the case of molding sand used for mold making, moldability, breathability, adaptability, etc. should be sufficiently considered, and it is also very important to grind the particles evenly because it depends a lot on the size of the particles.

In case of drying and using the collected naturally, there is no big problem because it is sorted and supplied during the collection process.

Such foundry sand regeneration equipment mainly includes a crusher for crushing foundry sand, a sorter for separating metals from the crushed foundry sand, a cooling device for cooling the foundry sand with separated metals, and a regenerator for removing chemicals on the surface of foundry sand, chemicals It is configured to include a transfer device for transferring the removed foundry sand.

In general, the grinding apparatus generally includes a mold by applying vibration, or a method of applying a vibration to a molding sand separated from the mold is generally applied.

In the related art, a vibration hopper is installed to be elastically supported by several buffer springs inside the support frame, and the lower side of the vibration hopper is formed in a tapered shape to form an inclined surface, and the inclined surface is discharged in the form of a long hole at a predetermined interval. Formed to discharge the pulverized casting sand, and a configuration in which a plurality of vibration motors capable of vibrating the vibration hopper with high power has been applied to the outside of the lower side of the vibration hopper.

However, the conventional pulverization device as described above is vibrated by the vibration motor, so that high heat is generated, and thus, there is a problem that frequent overload occurs due to vibration.

However, the conventional pulverizer as described above has a problem that the high temperature of the foundry sand is conducted to the vibration motor, the insulation breakdown and the bearing failure frequently.

As a technology to solve this problem, the 'Casting Sand Grinder' (Korea Registered Utility Model Publication No. 20-0320140) combines several friction stone bars inside the grinding drum, and installs a hammer fixed to the rotating shaft inside the grinding drum. By providing a scattering plate driven by the driving force of the rotary shaft on the discharge hopper formed to the lower side of the grinding drum, it is possible to hit the mass of the foundry sand to be lowered, so that the durability is improved by not affecting the gas, and it is included in the supplied sand The technology to prevent the clogging of the discharge hole formed in the lower side of the grinding drum due to the iron pieces, etc. to enable continuous operation, and to facilitate the discharge of the foundry sand is disclosed.

However, in the manner of hitting with a hammer installed on the rotating shaft as described above, a large-scale facility that is more than 10 m in size of the mold surrounding the casting sand requires a lot of power to rotate the hammer, there was a problem that damage to the hammer .

That is, it is not suitable to grind a very large mold from the beginning, and eventually, there is a need for a crushing device capable of smoothly crushing a large mold without loss of power and parts.

KR, 20-0320140, (2003.07.03.)

Foundry sand regeneration equipment equipped with an eccentric vibrating apparatus of the present invention is to solve the problems caused in the prior art, it is composed of a grinding device divided into a primary grinding device and a secondary grinding device, the primary grinding device and Secondary grinding device vibrates the flow frame by using a separate eccentric vibration device equipped with an eccentric shaft member while using a general motor, not a vibration motor, and effectively vibrates the flow frame while using a single motor to improve the grinding efficiency. I want to.

More specifically, by installing an eccentric shaft member having a diameter smaller than that of the shaft insertion tube provided at the bottom of the flow frame, the belt shaft being eccentrically located in the center, and connecting the eccentric shaft member and the shaft of the motor using a belt. As the eccentric shaft member rotates by the rotation of the motor, the flow frame is vibrated up and down greatly, while the displacement is larger than that of the conventional vibration motor, and the vibration is distributed evenly on the front surface to promote crushing.

In addition, the upper end of the flow frame of the primary crushing device is projected than the upper end of the support frame, so that the load is lower than the upper end of the support frame by the coil spring under load, so as to facilitate the support by excessive load using the support frame.

In addition, by installing a plurality of protruding pins on the bottom of the primary grinding device flow frame to crush the molding sand agglomerates falling to the bottom of the partition wall to break more finely to improve the grinding efficiency.

In order to solve the above problems, the foundry sand recycling apparatus equipped with the eccentric vibration device of the present invention includes a pulverizing apparatus for crushing the foundry sand, a sorter for separating metal from the crushed foundry sand, a cooling device for cooling the foundry sand, In the foundry sand regeneration facility comprising a reclaimer for removing the chemical on the surface of the pulverized, cooled casting sand and a transfer device for transferring the foundry sand removed, the pulverizing device is a primary grinding device for primary grinding the foundry sand; It is installed in the lower part of the primary crushing device is composed of a secondary crushing device for secondary crushing of the primary crushed molding sand in the primary crushing device, the primary crushing device and the secondary crushing device, a plurality of springs on the top A support frame having a seating protrusion installed on the spring seating protrusion and fitted with a coil spring; It is formed in the shape of a rectangular box, partition walls are formed to divide the interior space into a plurality of spaces, a plurality of through-holes are formed in the bottom, the shaft insertion tube is installed in the bottom bottom, the coil at the bottom edge A flow frame in which a plurality of spring insertion protrusions are formed so that an upper portion of the spring is fitted; It is formed in a cylindrical shape with a smaller diameter than the shaft insertion tube and penetrates the shaft insertion tube, and is eccentrically formed on the side to surround the belt shaft, the motor installed in the support frame, and the motor and the belt shaft. Consisting of an installed belt, an eccentric vibration device; consists of a plurality of protruding pins formed on the bottom of the flow frame of the primary grinding device, the top of the flow frame of the primary grinding device protrudes from the top of the support frame It is characterized in that configured to be lower than the upper end of the support frame by the coil spring under load.

At this time, the through hole of the secondary crushing device is formed smaller than the through hole of the primary crushing device, it characterized in that it has a cross-sectional shape of the lower light reciprocation.

In addition, the fixed bracket is fixed to the support frame, the rotating shaft is installed on one side, and is configured to be rotatable in connection with the rotating shaft, the motor support plate on which the motor is seated on the upper side, one side is connected to the motor support plate And the other side is a tension adjustment spring that is fixed to the fixing bracket; characterized in that is further provided.

In addition, the partition wall of the primary crushing device is characterized in that it has a cross-sectional shape of the lower narrow light.

In addition, the connecting hole is formed in the partition wall of the primary grinding device.

According to the present invention, the grinding device is divided into a primary grinding device and a secondary grinding device, but the primary grinding device and the secondary grinding device are all equipped with an eccentric shaft member while using a general motor instead of a vibration motor. By vibrating the flow frame by using the eccentric vibrator, the pulverization efficiency is improved by vibrating the flow frame effectively while using a single motor.

More specifically, by installing an eccentric shaft member having a diameter smaller than that of the shaft insertion tube provided at the bottom of the flow frame, the belt shaft being eccentrically located in the center, and connecting the eccentric shaft member and the shaft of the motor using a belt. As the eccentric shaft member rotates by the rotation of the motor, the flow frame is vibrated up and down greatly, while the displacement is larger than that of the conventional vibration motor, and the vibration is distributed evenly to the front surface, thereby crushing is promoted.

In addition, the upper end of the flow frame of the primary pulverizing device protrudes than the upper end of the support frame, so that the load is lower than the upper end of the support frame by the coil spring under load, so that the support by the excessive load is facilitated using the support frame.

In addition, by installing a plurality of protruding pins on the bottom of the primary grinding device flow frame, the crushing efficiency is improved by causing the lumps of the casting sand dropped to the bottom of the partition wall to hit the protruding pins more finely.

1 is a schematic diagram showing a foundry sand regeneration facility equipped with an eccentric vibration device of the present invention.
Figure 2 is a perspective view showing a pulverizing device in the foundry sand regeneration equipment with an eccentric vibration device of the present invention.
Figure 3 is an exploded perspective view showing a primary crushing device in the foundry sand regeneration equipment equipped with an eccentric vibration device of the present invention.
Figure 4 is an exploded perspective view showing a secondary grinding device in the foundry sand regeneration equipment equipped with an eccentric vibration device of the present invention.
Figure 5 is a schematic cross-sectional view showing a pulverizing device in the foundry sand regeneration equipment with an eccentric vibration device of the present invention.
Figure 6 is a schematic cross-sectional view showing an example in which the fixing bracket and the motor support plate is installed in the present invention.
Figure 7 is a schematic cross-sectional view showing a connection state of the motor and the eccentric shaft member in the present invention.

Foundry sand regeneration equipment equipped with an eccentric vibrating apparatus of the present invention is largely composed of a crusher, a separator, a cooling device, a regenerator, a transfer device.

The pulverizer is an apparatus for pulverizing the foundry sand by applying vibration to the foundry sand in the mold state in which the metal is contained or separated.

In addition, the separator refers to a device for separating the metal from the foundry sand pulverized in the crusher using a magnetic separator or the like.

The cooling device refers to a device for cooling the foundry sand which is still in a high temperature state, and the regenerator is a device for separating and removing the chemicals on the surface of the foundry sand passed through the cooling device.

The conveying apparatus is a device for conveying the foundry sand from which the chemical is removed to a subsequent process.

In addition, the material transfer between each device uses a bucket elevator and the like schematically shown in the drawings.

In addition, the four-cooler may be installed between the secondary grinding device and the separator, and between the separator and the regenerator, respectively.

In the present invention, the sorter, the cooling device, the regenerator, and the transfer device are used by applying various known devices, and are characterized by applying a grinding device composed of the primary grinding device 100 and the secondary grinding device 200. .

However, the cooling device is characterized by applying a separation device to which Bernoulli's theorem is applied as shown.

When the pipe is connected to the dust collector and the pipe in the conventional cooling system, the coarse particles sucked into the dust collector in the dust collection process damage the bag filter and block the inside of the duct. And, if the installation of the stopping plate inside the case is reduced in the speed of the dust is collected, the dust and the like caught on the stopping plate and is discharged separately, only the air is discharged to the dust collector side.

Hereinafter, with reference to the accompanying drawings for the pulverizing device which is the main configuration in the present invention will be described in detail.

In the present invention, the pulverizing apparatus is a primary crushing apparatus 100 for primary crushing the molding sand, and is installed in the lower portion of the primary crushing apparatus 100, the secondary pulverization of the primary crushed molding yarn in the primary crushing apparatus 100 The secondary crushing apparatus 200 is divided into a secondary crushing apparatus 200, and a hopper 800 is installed between the primary pulverizing apparatus 100 and the secondary crushing apparatus 200 to grind the pulverized in the primary crushing apparatus 100. Water was smoothly supplied to the secondary grinding device (200).

The primary crusher 100 and the secondary crusher 200 are configured to include both the support frames 110 and 210, the flow frames 120 and 220, and the eccentric vibration devices 130 and 230.

As shown in the support frames 110 and 210, a plurality of horizontal members 112 and 212 and vertical members 111 and 211 are connected to each other, and a plurality of springs are mounted on the horizontal members 112 and 212. The protrusions 113 and 213 are provided, and the coil springs 114 and 214 are fitted to each spring seating protrusion 113 and 213, respectively.

At this time, in the case of the primary crushing apparatus 100, as shown in the drawing, a plurality of horizontal members 112 are installed below the horizontal members 112 at the uppermost ends and the spring seating protrusions 113 are formed on the horizontal members 112. ) Is preferable.

That is, the upper end of the flow frame 120 of the primary grinding device 100 is protruded from the upper end of the support frame 110, but configured to be lower than the upper end of the support frame 110 by the coil spring 114 under load, This, in the state in which the flow frame 120 to be described later is seated on the upper support frame 110, the top of the flow frame 120 protrudes than the upper end of the support frame 110, When seated, the uppermost horizontal member 112 of the support frame 110 supports the mold so that the load of the mold is supported by the support frame 110 so as not to burden the flow frame 120 from excessive load. .

On the other hand, the flow frame (120, 220) is formed in a rectangular box shape, the center inner space is divided into a plurality of spaces by the partition walls (121, 221).

In addition, a plurality of through holes 122 and 222 are formed at the bottom of the flow frames 120 and 220.

Shaft insertion pipes 123 and 223 are installed at the bottom of the bottom of the flow frame 120 and 220, and a plurality of spring insertion protrusions 124 and 224 are formed to fit the upper portions of the coil springs 114 and 214 to the upper edges. It is.

As a result, the flow frames 120 and 220 are installed on the coil springs 114 and 214 installed in the support frames 110 and 210, and the molds are seated on the upper side, and as the molds are crushed, the pulverized products are ground through holes 122. 222 is discharged to the bottom through.

At this time, the through hole 122 of the primary crusher 100 and the through hole 222 of the secondary crusher 200 are not the same size, but rather the through holes 122 of the primary crusher 100. In order to increase the size, the through hole 222 of the secondary pulverization apparatus 200 may be formed to be smaller so that pulverization may occur sequentially.

The most preferable size of the through-holes 122 and 222 is preferably about 30 to 40 cm 2 in the case of the primary grinding device 100, and 0.15 to 0.25 cm 2 in the secondary grinding device 200 is preferable. Do.

In addition, the through hole of the primary grinding device 100 is preferably a rectangular shape having a width of about 4 cm and a length of about 8 cm, and in the case of the secondary grinding device 200, it is preferable to form a circular shape having a diameter of about 5 mm.

That is, in the primary grinding device 100, the mold is broken while being bumped by the partition wall 121, and in this process, those having an area of 30 to 40 cm 2 or less are moved to the secondary grinding device 200, and then the secondary grinding device ( At 200), more precisely, molding sands of 0.15 to 0.25 cm 2 or less are moved to the following process.

At this time, the through hole 222 of the secondary crushing apparatus 200 has a cross-sectional shape of the lower beam cross section so that the upper portion is 5 mm in diameter and the lower portion is 6 mm in diameter as shown in the drawing. It is preferable to allow the inlet casting sand to easily pass through the through-hole 222 to be discharged.

At this time, the bottom of the flow frame 120 of the primary grinding device 100 is formed with a plurality of protruding pins 125 it is preferable to make the mold falling on the floor by the protruding pins 125 more finely broken.

In addition, the partition wall 121 of the primary grinding device 100 is preferably formed in a lattice shape, and the partition wall 221 of the secondary grinding device 200 is preferably formed in one direction.

In addition, it is preferable that the partition wall 121 of the primary crushing apparatus 100 has a cross-sectional shape of the lower narrow light.

This is because, in the primary grinding device 100, a mold having a large load is settled before being crushed, so that the mold is pulverized only by vibration while supporting the mold smoothly.

In addition, by forming a connection hole 126 in the partition wall 121 of the primary crushing apparatus 100, it is possible to move to some extent the crushed molding sand by connecting the spaces blocked by the partition wall 121 with each other. desirable.

The eccentric vibration device (130, 230) is a device that allows the flow frame (120, 220) installed on the support frame (110, 210) to vibrate up and down, eccentric shaft members (131, 231), motor ( 133, 233, and the belts 134, 234, it is preferable to provide two or more eccentric shaft members (131, 231) as shown in order to double the vibration force.

The eccentric shaft members 131 and 231 are formed in a cylindrical shape with a smaller diameter than the shaft insertion pipes 123 and 223 installed at the bottom of the flow frames 120 and 220 and penetrate the shaft insertion pipes 123 and 223. The belt shafts 132 and 232 are eccentric to each other.

That is, the eccentric shaft members 131 and 231 are configured to eccentrically rotate the reference to the belt shafts 132 and 232 eccentric to the side.

In addition, the motors 133 and 233 are installed on either side of the support frames 110 and 210, and the belts 134 and 234 are installed to surround the motors 133 and 233 and the belt shafts 132 and 232. It is configured to transmit the rotational movements of the 133 and 233 to the belt shafts 132 and 232.

Looking at the operation by such an eccentric vibration device (130, 230), when the eccentric shaft member (131, 231) is rotated relative to the belt shaft (132, 232), the top displacement is changed, thereby the flow frame ( 120 and 220 vibrate up and down on the support frames 110 and 210, and at this time, the coil springs 114 and 214 may be elastically moved.

Specifically, the operation by the eccentric vibration device (130, 230), when the belt shaft 132, 232 of the eccentric shaft member is located at the lower end of the shaft insertion tube is inserted into the eccentric shaft member (131, 231) Displacements of the 123 and 223 become high, which causes the flow frames 120 and 220 to move upward.

On the contrary, when the belt shafts 132 and 232 of the eccentric shaft members 131 and 231 are located at a high point, the displacement of the shaft insertion pipes 123 and 223 into which the eccentric shaft members 131 and 231 are inserted is lowered. This causes the flow frames 120 and 220 to move downward.

Of course, the upper surface of the eccentric shaft member (131, 231) is in contact with the upper portion of the inner tube of the shaft insertion tube (123, 223) by the load of the self-weight and the mold of the flow frame (120, 220) in this process, In the process of changing the displacement, the vibration by the coil springs 114 and 214 becomes good.

This structure is different from a technique in which a vibrating motor is provided at the bottom of the frame in a technique provided with a frame, a support and a spring made to be movable in the prior art.

Specifically, since the vibration motor is configured so that the axis of the motor itself is eccentric, the entire frame is difficult to vibrate, and even if the vibration is propagated, its strength is weak, resulting in the installation of a plurality of vibration motors.

However, the eccentric vibrator 130, 230 as described above is applied to the eccentric shaft member (131, 231) and the belt 134, 234 while using a general motor to greatly increase the vibration of the flow frame (120, 220) It will have one advantage.

However, an important problem arises in such a configuration.

In detail, the belt shafts 132 of the eccentric shaft members 131 and 231 are moved up and down by the coil springs 114 and 214 and the flow frames 120 and 220 installed under the flow frames 120 and 220. , 232) the upper and lower positions are not fixed and a variable problem occurs.

That is, the rotational motion of the motors 133 and 233 should be transmitted to the belt shafts 132 and 232 through the belts 134 and 234. As the positions of the belt shafts 132 and 232 are changed up and down, the belts 134, 234 can be momentarily loosened, preventing movement from being delivered.

There is also a method of imparting elasticity to the belts 134 and 234 to some extent, but there is a problem in power transmission.

In order to solve this problem, it is preferable to vary the displacement of the motors 133 and 233 so that the belts 134 and 234 are always in a tense state.

Specifically, a motor having a fixed bracket (133a, 233a) having the rotating shafts (133b, 233b) is installed on the support frames (110, 210) on one side, and connected to the rotating shafts (133b, 233b) to be rotatable. The support plates 133c and 233c are installed, and one side is connected to the motor support plates 133c and 233c and the other side is prepared with the tension adjusting springs 133d and 233d connected to the fixing brackets 133a and 233a, and then the motor ( The 133 and 233 may be mounted on the motor support plates 133c and 233c.

This configuration allows the motor support plates 133c and 233c to rotate upwardly based on the rotation shafts 133b and 233b of the fixing brackets 133a and 233a when the displacement of the belt shafts 132 and 232 increases, and in the opposite case, the motor support plates. 133c and 233c are rotated downward with respect to the rotation shafts 133b and 233b of the fixing brackets 133a and 233a to some extent to adjust the shaft positions of the motors 133 and 233 installed on the support frames 110 and 210. While maintaining the tension of the belts 134 and 234 through tension adjusting springs 133d and 233d to the maximum and downward movement, the belts 134 and 234 are prevented from being loosened.

In addition, in the above configuration, the primary grinding device 100 and the secondary grinding device 200 are provided with a plurality of flow frames 120 and 220 and an eccentric vibration device on one support frame 110 and 210 as shown. 130 and 230 are installed, and each device is operated individually so that adjacent flow frames 120 and 220 are alternately vibrated to have interference and overlapping effects of vibration force.

Referring to the main operation of each device of the present invention configured as described above are as follows.

Primary grinding device 100 is the first step in the processing plant of the casting plant to vibrate the mold (cast box) mounted on the flow frame 120 to separate the solid sand mass in the mold, or It serves to remove the surface and internal debris.

At this time, the use of separate eccentric vibration device (130, 230) to solve the problem of the lack of vibration force, a large mold for the conventional problem.

In addition, the fixing brackets 133a and 233a, the motor support plates 133c and 233c, and tension control springs 133d and 233d were used to prevent the belts 134 and 234 from being changed by the vibration movement as much as possible.

The secondary crusher 200 serves to crush the mold pulverized by the primary crusher 100 to the size of the original sand particles.

Thereafter, the metal is separated from the foundry sand pulverized through a separator, a cooling device, and a conveying device, cooled, and then the chemicals on the surface are removed and then transferred to the next process.

100: primary grinding device 110: support frame
111: vertical member 112: horizontal member
113: spring seating projection 114: coil spring
120: fluid frame 121: bulkhead
122: through hole 123: shaft insertion pipe
124: spring insertion protrusion 125: protruding pin
126: connecting hole 130: eccentric vibration device
131: eccentric shaft member 132: belt shaft
133: motor 133a: fixed bracket
133b: rotating shaft 133c: motor support plate
133d: tension control spring 134: belt
200: secondary grinding device 210: support frame
211 vertical member 212 horizontal member
213: spring seating projection 214: coil spring
220: flow frame 221: partition wall
222: through hole 223: spring insertion protrusion
224: shaft insertion pipe 230: eccentric vibration device
231: eccentric shaft member 232: belt shaft
233: motor 233a: fixing bracket
233b: rotating shaft 233c: motor support plate
233d: tension adjustment spring 234: belt
300: four-cooler 400: sorter
500: regenerator 600: feeder
700: bucket elevator 800: hopper

Claims (5)

Crushing apparatus for crushing foundry sand, Separator for separating metal from crushed foundry sand, Chiller for cooling the foundry sand separated metal, Regenerator for removing chemical on the surface of crushed, cooled foundry sand, and Transferring foundry sand In the foundry sand regeneration facility comprising a feeder,
The pulverizing apparatus is a primary crushing apparatus 100 for primary crushing the molding sand, and is installed in the lower portion of the primary crushing apparatus 100 2 It is composed of a differential grinding device 200,
The primary grinding device 100 and the secondary grinding device 200,
A plurality of spring seating protrusions 113 and 213 are installed at an upper portion thereof, and support frames 110 and 210 having coil springs fitted into the spring seating protrusions 113 and 213;
It is formed in the shape of a rectangular box, partition walls 121 and 221 for dividing the internal space into a plurality of spaces are formed, a plurality of through holes 122 and 222 are formed in the bottom, the shaft insertion tube at the bottom (123, 223) is provided, and the flow frame (120, 220) is formed with a plurality of spring insertion projections (124, 224) to the upper portion of the coil spring is fitted to the bottom edge;
The eccentric shaft member 131, which is formed in a cylindrical shape with a smaller diameter than the shaft insertion pipes 123 and 223, penetrates the shaft insertion pipes 123 and 223, and is eccentric to the side, and the belt shafts 132 and 232 are installed. 231, the motors 133 and 233 installed on the support frames 110 and 210, and the belts 134 and 234 which are wrapped around the motors 133 and 233 and the belt shafts 132 and 232. Consisting of, eccentric vibration device (130, 230);
Fixed brackets 133a and 233a fixed to the support frames 110 and 210 and having rotation shafts 133b and 233b installed on one side thereof;
A motor support plate (133c, 233c) connected to the rotary shafts (133b, 233b) and configured to be rotatable, and on which motors (133, 233) are mounted;
One side is connected to the motor support plate (133c, 233c), the other side is fixed tension springs (133d, 233d) fixed to the fixing brackets (133a, 233a);
A plurality of protruding pins are formed at the bottom of the flow frame 120 of the primary grinding device 100, and the upper end of the flow frame 120 of the primary grinding device 100 protrudes from the top of the support frame 110. Characterized in that configured to be lower than the upper end of the support frame 110 by the coil spring under load,
Foundry sand regeneration equipment with eccentric vibration device.
The method of claim 1,
The through-hole 222 of the secondary crusher 200 is formed smaller than the through-hole 122 of the primary crusher 100, characterized in that having a cross-sectional shape of the lower beam
Foundry sand regeneration equipment with eccentric vibration device.
delete The method of claim 1,
Partition wall 121 of the primary crushing apparatus 100 is characterized in that it has a cross-sectional shape of the lower narrow light,
Foundry sand regeneration equipment with eccentric vibration device.
The method of claim 1,
It is characterized in that the connection hole is formed in the partition wall 121 of the primary grinding device 100,
Foundry sand regeneration equipment with eccentric vibration device.

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