CN118875215A - A casting sand cooling device - Google Patents

Abstract

The invention discloses a casting sand cooling device, which belongs to the technical field of casting material cooling equipment and comprises a frame, a housing, a separating cylinder and a water tank, wherein a plurality of rolling and scattering rod groups are arranged on the inner wall of the separating cylinder, each rolling and scattering rod group comprises 5-8 rolling and scattering rods, each rolling and scattering rod is provided with a bearing surface, the bearing surface is made of heat-resistant rubber, the interior of the rolling and scattering rod is hollow and provided with an opening, the bearing surface is fixed on the opening of the rolling and scattering rod, the widths of the inner rolling and scattering rods of the rolling and scattering rod groups in the direction from the input end to the output end of the separating cylinder are sequentially reduced, the bearing surfaces are recessed towards the hollow of the rolling and scattering rod groups through optimizing the widths of the rolling and scattering rods in the rolling and scattering rod groups, and large casting sand can enter the separating cylinder more stably and start the separating process, so that the blocking or stagnation phenomenon caused by insufficient supporting force of the rolling and scattering rods is reduced, and the integral separating efficiency is improved.

Description

A casting sand cooling device

Technical Field

The invention relates to the technical field of casting material cooling equipment, in particular to a casting sand cooling device.

Background Art

Foundry sand, also known as fused ceramsite sand and pearl sand, is made of high-quality bauxite as raw material through calcination, fusion, granulation, screening and other ceramsite sand processes. It is a commonly used foundry sand for aluminum castings. After the aluminum casting is completed, the temperature of the foundry sand is usually high. The foundry sand must be cooled before it can be recycled. Eddy current metal separator.

The Chinese invention patent with the announcement number CN117920937B in the prior art discloses a casting sand cooler for aluminum castings, which is used to separate the agglomerated part and the particle part in the block casting sand, and only water-cool the agglomerated part with a high temperature. The cooler comprises a frame, a separation cylinder rotatably mounted on the top of the frame, a plurality of rolling rods fixedly mounted on the inner wall of the separation cylinder, a water cooling box arranged below the output end of the separation cylinder, and a crushing roller arranged between the water cooling box and the separation cylinder. The separation cylinder is provided with a plurality of filtering parts matching the number of the rolling rods, the rolling rods are parallel to the axis of the separation cylinder, and the two sides of the rolling rods have oblique edges gradually approaching from the input end of the separation cylinder to the output end of the separation cylinder; the rolling rods are driven in the separation cylinder to push the block casting sand to move from the bottom to the top until the block casting sand flips and rolls off the rolling rods under the action of gravity, and the particle part on the rolled block casting sand is separated from the agglomerated part under the impact of rolling.

The above-mentioned device realizes the movement of the agglomerated foundry sand through the rolling rod in the separation cylinder, and raises the height of the agglomerated foundry sand in the separation cylinder to make it fall and separate it through the impact force of rolling. However, since the agglomerated foundry sand just entering the separation cylinder may have large lumps and irregular shapes, the rolling rods of the same specifications may find it difficult to lift and move the foundry sand, affecting the dispersion effect of the agglomerated foundry sand.

Summary of the invention

The object of the present invention is to provide a foundry sand cooling device to solve the technical problem in the prior art that rolling rods of the same specification may be difficult to lift and move the foundry sand, thereby affecting the dispersion effect of the agglomerated foundry sand.

The present invention provides a foundry sand cooling device, comprising a frame, a cover shell, a separation cylinder and a water tank, wherein the separation cylinder is rotatably connected to the frame, a plurality of sieve holes are provided in the separation cylinder, the cover shell is fixed to the frame, and the cover shell is coaxially wrapped around the outside of the separation cylinder, a fan is installed on the top of the cover shell, a discharge plate is installed on the bottom of the cover shell, the water tank is located at the lower side of the discharge end of the separation cylinder, and a crushing roller is also installed on the water tank, a plurality of rolling rod groups are installed on the inner wall of the separation cylinder, each rolling rod group includes 5-8 rolling rods, and the rolling rods in two adjacent rolling rod groups are staggered head to tail, and the rolling rods are arranged on the inner wall of the separation cylinder. It is inclined inside the separation cylinder, and each rolling rod is installed with a bearing surface, which is made of heat-resistant rubber. The inside of the rolling rod is hollow and has an opening, and the bearing surface is fixed on the opening of the rolling rod. The width of the inner rolling rods of several groups of rolling rods decreases successively from the input end to the output end of the separation cylinder. Trigger components are also fixed in the cover shell, and the number of trigger components is consistent with the number of rolling rod groups. When the separation cylinder rotates until the rolling rod in the rolling rod group contacts its corresponding trigger component, the trigger component can make the bearing surface of the rolling rod recessed toward the hollow part of the rolling rod.

Furthermore, a deformation column is installed in the middle of one side of the bearing surface of each rolling rod facing the hollow interior of the rolling rod, and a pull rope is connected to the deformation column. The pull rope extends through the rolling rod, and a ball head is fixed to the end of the pull rope away from the deformation column. A plurality of avoidance grooves for the movement of the ball head are also provided on the inner side of the cover shell. The number of the avoidance grooves is consistent with the number of trigger components, and each group of trigger components is installed in the corresponding avoidance groove. The trigger component includes a snap-in block, which is U-shaped as a whole. When the rolling rod rotates with the separation cylinder until the ball head of the rolling rod contacts the snap-in block, the snap-in block can limit the ball head from rotating with the rolling rod and pull the pull rope to cooperate with the deformation column to make the bearing surface concave.

Furthermore, each of the clamping blocks is rotatably connected in the avoidance groove, and a torsion spring is fixed at the rotational connection between the clamping block and the avoidance groove. The clamping block is kept horizontal by the elastic force of the torsion spring, so that the clamping block can stably clamp the ball head.

Furthermore, the elastic force of the torsion spring is greater than the elastic force of the bearing surface. When the clamping block fixes the ball head so that the bearing surface is deformed until the deformation column contacts the inner bottom wall of the rolling rod, the rolling rod that continues to move can pull the ball head to move by the pull rope, and cause the clamping block to rotate and compress the torsion spring. When the ball head is detached from the clamping block, the clamping block is reset by the elastic force of the torsion spring.

Furthermore, the heights of the multiple groups of trigger components gradually decrease in sequence from the input end to the output end of the separation cylinder.

Furthermore, a plurality of air holes are provided on the bearing surface, and when the bearing surface is deformed, the air holes are stretched open, and each rolling rod can be detachably installed in the separation cylinder.

Furthermore, the diameters of the air holes of each group of rolling rod groups gradually decrease in sequence from the input end to the output end of the separation cylinder.

Furthermore, it also includes a driving motor, a transmission wheel is installed on the main shaft of the driving motor, a follower ring is installed on the side of the separation cylinder close to its input end, and the follower ring is connected to the transmission wheel through a transmission belt.

Compared with the prior art, the beneficial effects of the present invention are:

(1) By optimizing the width of the rolling rods in each rolling rod group and recessing the bearing surface toward the hollow part of the rolling rod, large pieces of foundry sand can enter the separation barrel more smoothly and start the separation process, reducing the blockage or stagnation caused by insufficient support of the rolling rods, thereby improving the overall separation efficiency. The rolling rods with a larger width provide better support for the foundry sand in the initial stage, reducing the wear of the rolling rods and foundry sand caused by direct impact or sliding. As the volume of the foundry sand decreases, the gradual reduction in the width of the rolling rods also reduces unnecessary friction, further extending the service life of the equipment, allowing the separation barrel to better adapt to foundry sands of different sizes and specifications, and to ensure the transportation of agglomerated foundry sand. Compared with the use of components similar to auger for transportation inside the separation barrel, it can maximize the use of the space inside the separation barrel and increase the air cooling effect of the fan on small particles of foundry sand;

(2) When the rolling rod rotates to contact with the clamping block, the clamping block can clamp the ball head and pull the pull rope to cooperate with the deformation column to make the bearing surface concave, so that the bearing surface can move the agglomerated foundry sand more smoothly. When the clamping block fixes the ball head so that the bearing surface is deformed until the deformation column contacts the inner bottom wall of the rolling rod, the rolling rod that continues to move can pull the ball head to move by the pull rope, and make the clamping block rotate and compress the torsion spring. At this time, the restriction of the clamping block is lost, and the ball head and the pull rope are reset by the elastic force of the bearing surface itself. The reset elastic force of the bearing surface can bounce up the agglomerated foundry sand on the bearing surface, so that the agglomerated foundry sand is subjected to greater force when it contacts the inside of the separation cylinder, thereby enhancing the effect of breaking up the agglomerated foundry sand.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

FIG2 is an exploded view of the three-dimensional structure of the present invention;

FIG3 is a sectional view of the three-dimensional structure of the separation cylinder of the present invention;

FIG4 is a second sectional view of the three-dimensional structure of the separation cylinder of the present invention;

FIG5 is an enlarged view of point A in FIG4;

FIG6 is an enlarged view of point B in FIG4;

FIG7 is a sectional view of the three-dimensional structure of the cover shell of the present invention;

FIG8 is an enlarged view of point C in FIG7 .

Reference numerals:

100, frame; 110, cover; 120, water tank; 130, separation cylinder; 131, sieve hole; 140, fan; 150, discharge plate; 160, crushing roller; 170, drive motor; 180, transmission wheel; 190, follower ring;

200, rolling rod; 210, bearing surface; 220, deformation column; 230, pull rope; 240, ball head;

300, trigger component; 310, clamping block; 320, avoidance groove; 330, torsion spring.

DETAILED DESCRIPTION

The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In conjunction with Figures 1 to 8, an embodiment of the present invention provides a foundry sand cooling device, including a frame 100, a cover shell 110, a separation cylinder 130 and a water tank 120, wherein the separation cylinder 130 is rotatably connected to the frame 100, and a plurality of sieve holes 131 are provided in the separation cylinder 130, the cover shell 110 is fixed to the frame 100, and the cover shell 110 is coaxially wrapped around the outside of the separation cylinder 130, a fan 140 is installed on the top of the cover shell 110, a discharge plate 150 is installed on the bottom of the cover shell 110, the water tank 120 is located at the lower side of the discharge end of the separation cylinder 130, and a crushing roller 160 is also installed on the water tank 120, and a plurality of rolling rod groups are installed on the inner wall of the separation cylinder 130, each rolling rod group includes 5-8 rolling rods 200, and the rolling rods in two adjacent rolling rod groups are arranged on the inner wall of the separation cylinder 130. The rods 200 are staggered end to end, and the rolling rods 200 are inclined in the separation cylinder 130. A bearing surface 210 is installed on each rolling rod 200, and the bearing surface 210 is made of heat-resistant rubber. The inside of the rolling rod 200 is hollow and has an opening, and the bearing surface 210 is fixed on the opening of the rolling rod 200. The width of the inner rolling rod 200 of several groups of rolling rod groups decreases successively from the input end to the output end of the separation cylinder 130. A trigger component 300 is also fixed in the cover shell 110. The number of trigger components 300 is consistent with the number of rolling rod groups. When the separation cylinder 130 rotates until the rolling rod 200 in the rolling rod group contacts its corresponding trigger component 300, the trigger component 300 can make the bearing surface 210 of the rolling rod 200 recessed toward the hollow part of the rolling rod 200.

After the aluminum casting is finished and cooled, it is taken out from the casting sand. The staff operates the robot arm or mechanical equipment to transfer the remaining block casting sand to the input end of the separation cylinder 130. The separation cylinder 130 starts to rotate. At this time, the agglomerated casting sand will roll along the arc surface inside the separation cylinder 130 until it contacts the rolling rod 200 of the rolling rod group closest to the input end of the separation cylinder 130, and then be lifted by the bearing surface 210 of the rolling rod 200. Since the rolling rod 200 is set at an angle, the agglomerated casting sand will move on the rolling rod 200 toward the output end of the separation cylinder 130, and the agglomerated casting sand will move along the rolling rod 200 moves, and its height gradually increases. When it is separated from the rolling rod 200, the collision with the inner wall of the separation cylinder 130 can separate the gravel on it, thereby gradually reducing the volume of the agglomerated foundry sand. The arrangement of multiple rolling rod groups enables the agglomerated foundry sand to be continuously reduced in volume. The separated small-grain foundry sand is cooled by the air of the fan 140, directly passes through the sieve hole 131, and is discharged from the discharge plate 150 of the cover shell 110. The agglomerated foundry sand that has passed through the multiple rolling rod groups is gradually peeled off and discharged from the output end of the separation cylinder 130, and is crushed by the crushing roller 160, and finally enters the water tank 120 for water cooling.

By optimizing the width of the rolling rod 200 in each rolling rod group, and the bearing surface 210 is recessed toward the hollow of the rolling rod 200, large pieces of foundry sand can enter the separation cylinder 130 more smoothly and start the separation process, reducing the blockage or stagnation caused by insufficient support of the rolling rod 200, thereby improving the overall separation efficiency. The rolling rod 200 with a larger width provides better support for the foundry sand in the initial stage, reducing the wear of the rolling rod 200 and the foundry sand caused by direct impact or sliding. As the volume of the foundry sand decreases, the gradual reduction in the width of the rolling rod 200 also reduces unnecessary friction, further extending the service life of the equipment, so that the separation cylinder 130 can better adapt to foundry sand of different sizes and specifications, and can ensure the transportation of agglomerated foundry sand. Compared with using a component similar to an auger for transportation inside the separation cylinder 130, it can maximize the use of the space inside the separation cylinder 130, and can increase the air cooling effect of the fan 140 on small particles of foundry sand.

Preferably, a deformation column 220 is installed in the middle of the side of the bearing surface 210 of each rolling rod 200 facing the hollow inside of the rolling rod 200, and a pull rope 230 is connected to the deformation column 220. The pull rope 230 extends through the rolling rod 200, and a ball head 240 is fixed to the end of the pull rope 230 away from the deformation column 220. A plurality of avoidance grooves 320 for the ball head 240 to move are also opened on the inner side of the cover 110. The number of the avoidance grooves 320 is the same as the number of the trigger components 300. The amount is consistent, and each group of trigger components 300 is installed in the corresponding avoidance groove 320. The trigger component 300 includes a clamping block 310, and the clamping block 310 is U-shaped as a whole. When the rolling rod 200 rotates with the separation cylinder 130 until the ball head 240 of the rolling rod 200 contacts the clamping block 310, the clamping block 310 can limit the ball head 240 from rotating with the rolling rod 200, and pull the pull rope 230 to cooperate with the deformation column 220 to make the bearing surface 210 concave.

Preferably, each of the clamping blocks 310 is rotatably connected in the avoidance groove 320, and a torsion spring 330 is also fixed at the rotational connection between the clamping block 310 and the avoidance groove 320. The clamping block 310 is kept horizontal by the elastic force of the torsion spring 330, so that the clamping block 310 can stably clamp the ball head 240.

Preferably, the elastic force of the torsion spring 330 is greater than the elastic force of the bearing surface 210. When the clamping block 310 fixes the ball head 240 so that the bearing surface 210 is deformed until the deformation column 220 contacts the inner bottom wall of the rolling rod 200, the rolling rod 200 that continues to move can pull the ball head 240 to move through the pull rope 230, and make the clamping block 310 rotate to compress the torsion spring 330. When the ball head 240 is detached from the clamping block 310, the clamping block 310 is reset by the elastic force of the torsion spring 330.

When the rolling rod 200 rotates to contact the clamping block 310, the clamping block 310 can clamp the ball head 240 and pull the pull rope 230 to cooperate with the deformation column 220 through the pull rope 230 to make the bearing surface 210 concave, so that the bearing surface 210 can move the agglomerated foundry sand more smoothly. When the clamping block 310 fixes the ball head 240 to make the bearing surface 210 deform until the deformation column 220 contacts the inner bottom wall of the rolling rod 200, the rolling rod 200 that continues to move The loosening rod 200 can pull the ball head 240 to move through the pull rope 230, and make the clamping block 310 rotate and compress the torsion spring 330. At this time, the restriction of the clamping block 310 is lost, and the ball head 240 and the pull rope 230 are reset by the elastic force of the bearing surface 210 itself. The reset elastic force of the bearing surface 210 can bounce up the agglomerated foundry sand on the bearing surface 210, so that the agglomerated foundry sand is subjected to greater force when contacting the inside of the separation cylinder 130, thereby enhancing the effect of breaking up the agglomerated foundry sand.

Preferably, the heights of the multiple groups of trigger components 300 are gradually reduced in sequence from the input end to the output end of the separation cylinder 130; optionally, the inside of the roll-out rod 200 in the roll-out rod group at the output end of the separation cylinder 130 is solid, and the group of roll-out rods has no trigger component 300 to cooperate with it;

The closer the trigger component 300 is to the input end of the separation cylinder 130, the higher the position of the trigger component 300 is, and the higher the position at which the bearing surface 210 is reset and the agglomerated foundry sand is bounced up, so as to increase the contact force between the agglomerated foundry sand and the inner wall of the separation cylinder 130; and the closer the trigger component 300 is to the output end of the separation cylinder 130, the lower the position of the trigger component 300 is, and the lower the position at which the bearing surface 210 is reset and the agglomerated foundry sand is bounced up, thereby avoiding directly ejecting the agglomerated foundry sand out of the separation cylinder 130, which increases the difficulty of subsequent cleaning and recycling work for the staff.

Preferably, a plurality of air holes are provided on the bearing surface 210. When the bearing surface 210 is deformed, the air holes are stretched open, and each rolling rod 200 can be detachably installed in the separation cylinder 130. When the bearing surface 210 is stretched and deformed, the air holes are also stretched open. At this time, the cavity volume of the rolling rod 200 is compressed, and the gas is discharged through the air holes, which can assist in cooling the agglomerated foundry sand on the bearing surface 210. Due to the presence of the air holes, it is difficult to avoid that some foundry sand may enter the rolling rod 200 through the air holes. Therefore, the rolling rod 200 is configured to be detachable to facilitate replacement by the staff.

Preferably, the diameters of the air holes of each group of rolling rods are gradually reduced in sequence from the input end to the output end of the separation cylinder 130 to prevent the foundry sand with smaller and smaller volumes from entering the inside of the rolling rods 200 through the air holes.

Preferably, it also includes a driving motor 170, a transmission wheel 180 is installed on the main shaft of the driving motor 170, a follower ring 190 is installed on the side of the separation cylinder 130 close to its input end, the follower ring 190 is connected to the transmission wheel 180 through a transmission belt, and when the driving motor 170 is working, it can drive the separation cylinder 130 to rotate.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. The utility model provides a casting sand cooling device, including frame (100), housing (110), separating drum (130) and water tank (120), separating drum (130) rotate and connect on frame (100), set up a plurality of sieve meshes (131) in separating drum (130), housing (110) are fixed on frame (100), and housing (110) coaxial parcel is in separating drum (130) outside, fan (140) are installed at housing (110) top, housing (110) bottom installation flitch (150), water tank (120) are located the downside of separating drum (130) discharge end, and still install crushing roller (160) on water tank (120), characterized in that, separating drum (130) inner wall installs a plurality of roller scattering pole groups, all include 5-8 roller scattering pole (200) in every group roller scattering pole group, and roller scattering pole (200) in the adjacent two groups are crisscross head and tail, roller scattering pole (200) are in separating drum (130) and are the slope form, all install bearing face (210) on housing (110) bottom installation, rubber bearing face (200) is made by the roller scattering pole (200) and is carried out the inner side (200) in proper order, a plurality of opening of roller scattering pole groups are opened to the inner side (200) in order, the direction is opened to the roller scattering pole (200) is opened to the roller scattering of the roller group (200) is equipped with in order, the trigger components (300) are also fixed in the housing (110), the number of the trigger components (300) is consistent with that of the rolling and scattering rod groups, and when the separating cylinder (130) rotates until the rolling and scattering rods (200) in the rolling and scattering rod groups are contacted with the corresponding trigger components (300), the trigger components (300) can enable the bearing surfaces (210) of the rolling and scattering rods (200) to be sunken towards the hollow parts of the rolling and scattering rods (200);

Each bearing surface (210) of the rolling and scattering rod (200) is provided with a deformation column (220) towards the middle part of one hollow side inside the rolling and scattering rod (200), the deformation column (220) is connected with a pull rope (230), the pull rope (230) extends to penetrate through the rolling and scattering rod (200), one end, far away from the deformation column (220), of the pull rope (230) is fixedly provided with a ball head (240), the inner side of the housing (110) is also provided with a plurality of avoidance grooves (320) for the ball head (240) to move, the number of the avoidance grooves (320) is consistent with that of the triggering parts (300), each group of triggering parts (300) are arranged in the corresponding avoidance grooves (320), the triggering parts (300) comprise clamping blocks (310), the whole body of the clamping blocks (310) is U-shaped, and when the rolling and scattering rod (200) rotates along with the separating drum (130) until the ball head (240) of the rolling and scattering rod (200) contacts with the clamping blocks (310), the ball head (240) can be limited to rotate along with the rolling and scattering rod (200), and the triggering parts (300) are pulled to be matched with the corresponding to the bearing surface (210) to enable the bearing surfaces (210) to be sunken.

2. The casting sand cooling device according to claim 1, wherein each clamping block (310) is rotationally connected in the avoidance groove (320), a torsion spring (330) is further fixed at the rotational connection position of the clamping block (310) and the avoidance groove (320), and the clamping block (310) is kept horizontal by the elasticity of the torsion spring (330), so that the clamping block (310) can stabilize the clamping ball head (240).

3. The casting sand cooling device according to claim 2, wherein the spring force of the torsion spring (330) is larger than the spring force of the bearing surface (210), when the ball head (240) is fixed by the clamping block (310) so that the bearing surface (210) deforms until the deformation column (220) contacts with the inner bottom wall of the rolling and scattering rod (200), the rolling and scattering rod (200) which continues to move can pull the ball head (240) to move through the pull rope (230), and the clamping block (310) rotationally compresses the torsion spring (330), and when the ball head (240) is separated from the clamping block (310), the clamping block (310) is reset by the spring force of the torsion spring (330).

4. A foundry sand cooling device according to claim 1, characterized in that the height of the sets of triggering elements (300) decreases gradually in sequence from the inlet end to the outlet end of the separating drum (130).

5. The casting sand cooling device according to claim 1, wherein the bearing surface (210) is further provided with a plurality of ventilation holes, the ventilation holes are stretched to be opened when the bearing surface (210) is deformed, and each of the rolling-off rods (200) is detachably installed in the separating cylinder (130).

6. The foundry sand cooling unit according to claim 5 wherein the vent hole diameters of the respective sets of the roll-off bars decrease gradually in sequence from the input end to the output end of the separation barrel (130).

7. The casting sand cooling device according to claim 1, further comprising a driving motor (170), wherein a driving wheel (180) is mounted on a main shaft of the driving motor (170), a follower ring (190) is mounted on one side of the separating cylinder (130) near the input end of the separating cylinder, and the follower ring (190) is in driving connection with the driving wheel (180) through a driving belt.