Cooling device for precoated sand

Abstract

The invention discloses a cooling device for precoated sand. The cooling device comprises a cooling cylinder and a heat exchange roller rotationally mounted in the cooling cylinder. The heat exchange roller comprises a plurality of heat exchange cylinders which are coaxially distributed with the cooling cylinder body, the cylinder wall of each heat exchange cylinder is constructed to be a cylinder body with a medium cavity interlayer, and a medium cavity of each heat exchange cylinder is filled with a heat exchange medium; a conveying channel for sand to pass through is arranged between every two adjacent heat exchange barrels or between the heat exchange barrels and the cooling barrel, so that the sand entering the feeding barrel passes through the conveying channels and then is discharged from the discharging barrel, and the sand is in contact with the heat exchange barrels for heat exchange when conveyed in the conveying channels. The precoated sand which is originally accumulated in the cylinder in a concentrated manner is divided into multiple layers and is spread in a concentric circle distribution manner, and each layer of sand exchanges heat with the independent heat exchange roller, so that the sand cooling treatment capacity of the device in unit volume can be improved, and meanwhile, the sand cooling speed can also be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coated sand production, and specifically refers to a cooling device for coated sand. Background Art

[0002] Coated sand is a special type of molding sand or core sand. Its characteristic is that a layer of solid resin film is coated on the surface of the sand before molding. This material is mainly composed of raw sand, binder, curing agent, lubricant and special additives. In the thermal coating process, the resin is heated to a molten state and coated on the surface of the sand. During the cooling process, the resin gradually solidifies to form a hard resin film, thereby enhancing the strength and wear resistance of the coated sand. Cooling helps to stabilize the performance of the coated sand, so that it maintains stable physical and chemical properties during use.

[0003] At present, the cooling of coated sand is generally carried out in rollers that can exchange heat or open conveyor belts, with air cooling or water cooling. In order to improve the heat dissipation effect of the coated sand, the coated sand needs to be spread out over a larger area, resulting in a larger conveyor belt footprint. In roller-type water cooling, a single roller is usually used for contact heat exchange with the coated sand, and the relative space utilization rate is relatively low. Therefore, in order to reduce the size of the equipment, a compact cooling device is urgently needed. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a cooling device for coated sand to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is as follows: a cooling device for coated sand is proposed, comprising a cooling cylinder and a heat exchange roller rotatably mounted inside the cooling cylinder, a feed cylinder and a discharge cylinder for feeding sand materials in and out are respectively arranged at both ends of the outer wall of the cooling cylinder, and a driver for driving the heat exchange roller to rotate is fixedly mounted on the outer wall of the cooling cylinder; Among them, the heat exchange roller includes a plurality of heat exchange cylinders coaxially distributed with the cooling cylinder, and the cylinder wall of each heat exchange cylinder is constructed as a cylinder with a medium cavity interlayer, and the medium cavity of each heat exchange cylinder is filled with heat exchange medium, and a conveying channel for sand to pass through is provided between two adjacent heat exchange cylinders or between the heat exchange cylinder and the cooling cylinder, so that the sand entering the feed cylinder passes through the conveying channel and is discharged from the discharge cylinder, and contacts with the heat exchange cylinder for heat exchange when being transported in the conveying channel.

[0006] Furthermore, the heat exchange roller includes a first heat exchange cylinder, a second heat exchange cylinder and a third heat exchange cylinder which are coaxially distributed from the inside to the outside, the first heat exchange cylinder includes a first inner cylinder and a first outer cylinder which are coaxially distributed, a first medium cavity for filling heat exchange medium is provided between the first inner cylinder and the first outer cylinder, the second heat exchange cylinder includes a second inner cylinder and a second outer cylinder which are coaxially distributed, a second medium cavity for filling heat exchange medium is provided between the second inner cylinder and the second outer cylinder, the third heat exchange cylinder includes a third inner cylinder and a third outer cylinder which are coaxially distributed, a third medium cavity for filling heat exchange medium is provided between the third inner cylinder and the third outer cylinder, the first outer cylinder and the second inner cylinder, the third inner cylinder and the second outer cylinder, and the third outer cylinder and the inner wall of the cooling cylinder all have the conveying channel, and the thickness of the three conveying channels is consistent.

[0007] Furthermore, on one side close to the feed cylinder, the distances between the first heat exchange cylinder, the second heat exchange cylinder and the third heat exchange cylinder and the end faces of the cooling cylinder body decrease gradually from outside to inside along the axial direction, a first connecting cylinder is provided between the third heat exchange cylinder and the end faces of the cooling cylinder body, a first leakage window is provided on the first connecting cylinder, a second connecting cylinder is provided between the second heat exchange cylinder and the end faces of the cooling cylinder body, a second leakage window is provided on the second connecting cylinder, so that the sand material entering the feed cylinder can enter the three conveying channels through the first leakage window and the second leakage window.

[0008] Furthermore, the outer side walls of the first heat exchange tube, the second heat exchange tube and the third heat exchange tube are each provided with a plurality of guide fins centrally symmetrically distributed around the axis, and the guide fins are configured to feed the sand in the conveying channel from the feed tube to the discharge tube, and on one side close to the discharge tube, the second heat exchange tube and the third heat exchange tube are each provided with a discharge window, and the discharge window is used to connect the three conveying channels so that the sand in the conveying channel can be discharged from the discharge tube.

[0009] Furthermore, a driven wheel group is provided on one end of the cooling cylinder close to the feeding cylinder, and the driven wheel group includes a first driven wheel, a second driven wheel and a third driven wheel coaxially distributed from the inside to the outside, the first driven wheel, the second driven wheel, the third driven wheel and the cooling cylinder are rotatably connected to each other, the first driven wheel is fixedly connected to the end of the first heat exchange cylinder, the second driven wheel is fixedly connected to the end of the second connecting cylinder, and the third driven wheel is fixedly connected to the end of the first connecting cylinder, and the driver can drive the first driven wheel, the second driven wheel and the third driven wheel to rotate at the same time, and there is a speed difference between the first driven wheel, the second driven wheel and the third driven wheel.

[0010] Furthermore, the driver includes a motor fixed to the bottom of the cooling cylinder, a drive shaft is fixedly provided at the output end of the motor, and transmission belts are installed on the drive shaft corresponding to the first driven wheel, the second driven wheel and the third driven wheel, so that the transmission belt can simultaneously drive the first driven wheel, the second driven wheel and the third driven wheel to rotate.

[0011] Furthermore, the diameters of the first driven wheel, the second driven wheel and the third driven wheel increase step by step, and the rotation speeds of the first driven wheel, the second driven wheel and the third driven wheel decrease step by step.

[0012] Furthermore, a sealing cover is provided on one end of the cooling cylinder close to the discharge cylinder, the end faces of the first heat exchange cylinder, the second heat exchange cylinder and the third heat exchange cylinder are rotatably mounted on the sealing cover, and the first medium cavity, the second medium cavity and the third medium cavity are sealed by the sealing cover.

[0013] Furthermore, the sealing cover includes a cover plate, and a liquid separator ring is fixedly provided on the outer surface of the cover plate corresponding to the first heat exchange tube, the second heat exchange tube and the third heat exchange tube, and a pipe joint connected to an external pumping device is provided on the liquid separator ring, and a plurality of tube groups are provided on the side of the cover plate facing the first heat exchange tube, the second heat exchange tube and the third heat exchange tube, each of the tube groups includes a return pipe and a liquid supply pipe, the liquid supply pipe is configured to introduce heat exchange medium into the medium cavity, and the return pipe is configured to discharge the heat exchange medium from the medium cavity, so that the heat-conducting medium circulates in the medium cavity.

[0014] Furthermore, a plurality of medium guide strips parallel to the axis are provided in the medium cavity along the circumferential direction, a slot for mounting the medium guide strips is provided on the cover plate, and the length of the medium guide strips is less than the length of the heat exchange cavity, a medium channel is provided between any two adjacent medium guide strips, the return pipes and the liquid supply pipes are alternately distributed in the plurality of medium channels, and every two adjacent medium channels and the return pipe and the liquid supply pipe form a "U"-shaped circulation loop.

[0015] Beneficial effects: The present invention arranges multiple layers of coaxially distributed heat exchange cylinders from the inside to the outside of the cooling cylinder body, and forms conveying channels for sand to pass through between the heat exchange cylinders, so that the coated sand originally concentratedly accumulated in the cylinder is divided into multiple layers and spread out in a concentric circle distribution, so that each layer of sand exchanges heat with an independent heat exchange roller respectively, which can not only improve the processing capacity of sand cooling within a unit volume of the device, but also improve the cooling speed of the sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a cooling device for coated sand proposed in an embodiment of the present invention; Figure 2A schematic diagram of the internal structure of a cooling device for coated sand proposed in an embodiment of the present invention; Figure 3 A schematic cross-sectional view of a heat exchange roller according to an embodiment of the present invention is provided; Figure 4 A structural schematic diagram of a first side surface of a sealing cover provided in an embodiment of the present invention; Figure 5 The present invention provides a structural schematic diagram of the second side surface of the sealing cover according to an embodiment of the present invention.

[0017] Among them, 10, cooling cylinder; 100, cooling cavity; 101, feeding cylinder; 102, discharging cylinder; 11, bracket; 20, heat exchange roller; 200, conveying channel; 201, discharge window; 202, guide fin; 21, first heat exchange cylinder; 210, first medium cavity; 211, first inner cylinder; 212, first outer cylinder; 22, second heat exchange cylinder; 220, second medium cavity; 221, second inner cylinder; 222, second outer cylinder; 223, second connecting cylinder; 2230, second leakage window; 23, third heat exchange cylinder ; 230, third medium cavity; 231, third inner cylinder; 232, third outer cylinder; 233, first connecting cylinder; 2330, first leakage window; 30, driver; 31, motor; 32, drive shaft; 33, transmission belt; 40, driven wheel group; 41, first driven wheel; 42, second driven wheel; 43, third driven wheel; 50, sealing cover; 51, cover plate; 511, card slot; 52, reflux pipe; 53, liquid supply pipe; 54, liquid separation ring; 541, pipe joint; 60, medium guide strip; 600, medium channel.

[0018] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0021] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a cooling device for coated sand is provided, which aims to improve the cooling processing capacity of coated sand within a unit volume of the device. The device mainly comprises a cooling cylinder 10 and a heat exchange roller 20 rotatably installed inside the cooling cylinder 10, wherein a bottom mounting bracket 11 of the cooling cylinder 10 is used to support the cooling cylinder 10 to maintain a stable working state, a cooling cavity 100 is provided in the cooling cylinder 10, and a feed cylinder 101 and a discharge cylinder 102 for feeding sand in and out are respectively provided at both ends of the outer wall of the cooling cylinder 10, and a driver 30 for driving the heat exchange roller 20 to rotate is fixedly installed on the outer wall of the cooling cylinder 10, and the sand entering the cooling cavity 100 from the feed cylinder 101 is transported by the heat exchange roller 20 from the feed cylinder 101 toward the discharge cylinder 102 when passing through the rotating heat exchange roller 20, and in the process of transportation, the coated sand is contacted with the heat exchange roller 20 for heat exchange, so as to achieve a cooling effect.

[0022] Furthermore, in order to increase the processing capacity of coated sand in the device per unit volume, the heat exchange roller 20 includes a plurality of heat exchange cylinders coaxially distributed with the cooling cylinder 10, and the cylinder wall of each heat exchange cylinder is constructed as a cylinder with a medium cavity interlayer, and the medium cavity of each heat exchange cylinder is filled with heat exchange medium, and a conveying channel 200 for sand to pass through is provided between two adjacent heat exchange cylinders or between the heat exchange cylinder and the cooling cylinder 10.

[0023] like Figure 2 and Figure 3 As shown, in some embodiments, the heat exchange roller 20 includes a first heat exchange tube 21, a second heat exchange tube 22 and a third heat exchange tube 23 which are coaxially distributed from the inside to the outside.

[0024] The first heat exchange cylinder 21 includes a first inner cylinder 211 and a first outer cylinder 212 which are coaxially distributed, and a first medium cavity 210 for filling a heat exchange medium is provided between the first inner cylinder 211 and the first outer cylinder 212; The second heat exchange cylinder 22 comprises a second inner cylinder 221 and a second outer cylinder 222 which are coaxially arranged, and a second medium cavity 220 for filling a heat exchange medium is provided between the second inner cylinder 221 and the second outer cylinder 222; The third heat exchange cylinder 23 comprises a third inner cylinder 231 and a third outer cylinder 232 which are coaxially distributed. A third medium cavity 230 for filling a heat exchange medium is provided between the third inner cylinder 231 and the third outer cylinder 232 .

[0025] Furthermore, there are conveying channels 200 between the first outer tube 212 and the second inner tube 221 , between the third inner tube 231 and the second outer tube 222 , and between the third outer tube 232 and the inner wall of the cooling tube body 10 , and the thickness of the three conveying channels 200 is consistent.

[0026] In this way, after the sand material enters the feed barrel 101 and reaches the cooling chamber 100, it enters into multiple conveying channels 200 respectively, and is conveyed by multiple heat exchange rollers 20, and is finally discharged from the discharge barrel 102. When being conveyed in the conveying channel 200, it contacts and exchanges heat with the heat exchange roller, so that the coated sand originally concentrated in the barrel is divided into multiple layers and spread out in a concentric circle distribution, so that each layer of sand material exchanges heat with an independent heat exchange roller 20 respectively. In this way, not only can the sand material cooling processing capacity per unit volume of the device be increased, but also the cooling speed of the sand material can be increased.

[0027] like Figure 2 and Figure 3 As shown, on the side close to the feed barrel 101, the distances between the first heat exchange barrel 21, the second heat exchange barrel 22 and the third heat exchange barrel 23 and the end faces of the cooling barrel 10 decrease gradually from outside to inside in the axial direction, so that the sand falling from the feed barrel 101 can enter the three conveying channels 200 respectively.

[0028] Furthermore, in order to enable the heat exchange roller 20 to be connected to the end surface of the cooling cylinder 10 to ensure that the heat exchange roller 20 can rotate around the axis position inside the cooling cylinder 10, a first connecting cylinder 233 is provided between the third heat exchange cylinder 23 and the end surface of the cooling cylinder 10, and a first leakage window 2330 is provided on the first connecting cylinder 233, and a second connecting cylinder 223 is provided between the second heat exchange cylinder 22 and the end surface of the cooling cylinder 10, and a second leakage window 2230 is provided on the second connecting cylinder 223, so that the sand entering the feed cylinder 101 can enter the three conveying channels 200 through the first leakage window 2330 and the second leakage window 2230. In this way, while ensuring that the sand enters the three-layer conveying channel 200, it is also ensured that the first heat exchange cylinder 21, the second heat exchange cylinder 22 and the third heat exchange cylinder 23 can all rotate around the axis of the cooling cylinder 10.

[0029] Furthermore, the outer walls of the first heat exchange tube 21, the second heat exchange tube 22 and the third heat exchange tube 23 are each provided with a plurality of guide fins 202 which are centrally symmetrically distributed around the axis, wherein the guide fins 202 are fixed on the outer wall of the heat exchange tube, and the guide fins 202 are constructed as an arc-shaped sheet structure, and the height of the guide fins 202 is set to be more than 2 / 3 of the height of the conveying channel 200, and the guide fins 202 are configured to feed the sand in the conveying channel 200 from the feed tube 101 to the discharge tube 102. In this way, when the first heat exchange tube 21, the second heat exchange tube 22 and the third heat exchange tube 23 rotate, the sand in the conveying channel 200 can be correspondingly conveyed toward the discharge tube 102.

[0030] In some embodiments, in order to allow the sand in the conveying channel 200 to be discharged from the discharge barrel 102 after heat exchange and cooling, a discharge window 201 is provided on the second heat exchange barrel 22 and the third heat exchange barrel 23 on the side close to the discharge barrel 102. The discharge window 201 is used to connect the three conveying channels 200 so that the sand in the conveying channels 200 can be discharged from the discharge barrel 102. The shape of the discharge window 201 is set to be rectangular or circular, and the curvature of the discharge window 201 is less than π. It should be understood that the discharge window 201 is not limited to one, and can also be set to multiple relatively small ones. The main purpose is to connect the three conveying channels 200 and allow the sand in the conveying channels 200 to be discharged from the discharge barrel 102.

[0031] like Figure 1 and Figure 2 As shown, a driven wheel group 40 is provided on one end of the cooling cylinder 10 close to the feed cylinder 101, and the driven wheel group 40 includes a first driven wheel 41, a second driven wheel 42 and a third driven wheel 43 which are coaxially distributed from the inside to the outside. It should be understood that the first driven wheel 41, the second driven wheel 42, the third driven wheel 43 and the cooling cylinder 10 are all equipped with bearings and are rotatably connected through the bearings, wherein the first driven wheel 41 is fixedly connected to the end of the first heat exchange cylinder 21, the second driven wheel 42 is fixedly connected to the end of the second connecting cylinder 223, and the third driven wheel 43 is fixedly connected to the end of the first connecting cylinder 233. The driver 30 can simultaneously drive the first driven wheel 41, the second driven wheel 42 and the third driven wheel 43 to rotate, and there is a speed difference between the first driven wheel 41, the second driven wheel 42 and the third driven wheel 43.

[0032] In some embodiments, the driver 30 includes a motor 31 fixed to the bottom of the cooling cylinder 10, and a drive shaft 32 is fixedly provided at the output end of the motor 31. The drive shaft 32 is provided with transmission belts 33 corresponding to the first driven wheel 41, the second driven wheel 42 and the third driven wheel 43. When working, the drive shaft 32 is driven by the motor 31 to rotate, and through the three sets of transmission belts 33 arranged on the outside of the drive shaft 32, the transmission belts 33 can respectively and simultaneously drive the first driven wheel 41, the second driven wheel 42 and the third driven wheel 43 to rotate.

[0033] Furthermore, the diameters of the first driven wheel 41, the second driven wheel 42 and the third driven wheel 43 are gradually increased, so that the rotation speeds of the first driven wheel 41, the second driven wheel 42 and the third driven wheel 43 are gradually reduced. In this way, the first heat exchange tube 21 located at the most central position has the fastest rotation speed, and the rotation speeds of the second heat exchange tube 22 and the third heat exchange tube 23 are gradually reduced toward the outside. Since the amount of sand contained in the conveying channel 200 outside the first heat exchange tube 21 is the smallest, the heat exchange speed is also relatively fast. The relatively fast rotation speed can discharge the sand after heat exchange in time, so as to improve the overall work efficiency and increase the processing capacity of sand cooling per unit time. As the sand in the two outer conveying channels 200 increases step by step, the conveying speed of the sand by the second heat exchange tube 22 and the third heat exchange tube 23 is gradually slowed down, thereby extending the heat exchange time of the sand and ensuring that the sand can be fully cooled.

[0034] like Figure 2 , Figure 4 and Figure 5 As shown, a sealing cover 50 is provided at one end of the cooling cylinder 10 close to the discharge cylinder 102, and the end faces of the first heat exchange cylinder 21, the second heat exchange cylinder 22 and the third heat exchange cylinder 23 are rotatably mounted on the sealing cover 50, and the first medium cavity 210, the second medium cavity 220 and the third medium cavity 230 are sealed by the sealing cover 50. In some embodiments, mechanical seals are installed at the connection parts between the sealing cover 50 and the first heat exchange cylinder 21, the second heat exchange cylinder 22 and the third heat exchange cylinder 23, so that the sealing cover 50 and the first heat exchange cylinder 21, the second heat exchange cylinder 22 and the third heat exchange cylinder 23 can rotate while ensuring the sealing performance.

[0035] Furthermore, the sealing cover 50 includes a cover plate 51, and liquid separator rings 54 are fixedly provided on the outer surface of the cover plate 51 corresponding to the first heat exchange tube 21, the second heat exchange tube 22 and the third heat exchange tube 23. The liquid separator ring 54 is provided with a pipe joint 541 connected to an external pumping device. The pipe joint 541 is connected to an external pumping device through a hose, which is used to pump cooling medium into or extract cooling medium. Generally, purified cooling water is used as the cooling medium.

[0036] like Figure 4 As shown, a plurality of tube groups are provided on one side of the cover plate 51 facing the first heat exchange tube 21, the second heat exchange tube 22 and the third heat exchange tube 23, and the plurality of tube groups are centrally symmetrically distributed around the central axis of the cover plate 51, and each tube group includes a return pipe 52 and a liquid supply pipe 53, the liquid supply pipe 53 is configured to introduce heat exchange medium into the medium cavity, and the return pipe 52 is configured to lead the heat exchange medium out of the medium cavity, so that the heat transfer medium circulates in the medium cavity.

[0037] Among them, two groups of channels are provided inside the liquid separator ring 54, one group of channels is connected to multiple return pipes 52 distributed in a ring shape, and the other group of channels is connected to multiple liquid supply pipes 53 distributed in a ring shape. When the pipe joint 541 is connected to the external liquid pump device, cooling water can be continuously introduced into the medium cavity through the liquid separator ring 54 and the liquid supply pipe 53, and the cooling water after heat exchange in the medium cavity can be discharged through the return pipe 52 to form a circulating cooling water circuit.

[0038] Furthermore, in order to make the water path between the liquid supply pipe 53 and the return pipe 52 have a better route in the medium cavity so that the cooling water can cool the coated sand, a plurality of medium guide strips 60 parallel to the axis are provided in the medium cavity along the circumferential direction, and a slot 511 for mounting the medium guide strip 60 is provided on the cover plate 51, so that the medium guide strip 60 can be detachably installed on the cover plate 51.

[0039] Among them, the length of the medium guide strip 60 is less than the length of the heat exchange cavity. In some embodiments, the medium guide strip 60 is slightly shorter than the length of the medium cavity, so that the cooling water can reflux in a "U" shape there. There is a medium channel 600 between any two adjacent medium guide strips 60. The return pipe 52 and the liquid supply pipe 53 are alternately distributed in the multiple medium channels 600. Every two adjacent medium channels 600 and the return pipe 52 and the liquid supply pipe 53 form a "U"-shaped circulation loop. In this way, along the axial direction of the heat exchange tube, the cooling water forms a "U"-shaped reflux channel between the medium channel 600 connected to the return pipe 52 and the medium channel 600 connected to the liquid supply pipe 53, which is used for heat exchange and cooling of the coated sand on the outside of the heat exchange tube.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A cooling device for coated sand, characterized in that: It comprises a cooling cylinder (10) and a heat exchange roller (20) rotatably mounted inside the cooling cylinder (10), wherein a feed cylinder (101) and a discharge cylinder (102) for feeding sand material in and out are respectively provided at both ends of the outer wall of the cooling cylinder (10), and a driver (30) for driving the heat exchange roller (20) to rotate is fixedly mounted on the outer wall of the cooling cylinder (10); The heat exchange roller (20) comprises a plurality of heat exchange cylinders coaxially distributed with the cooling cylinder (10), and the cylinder wall of each heat exchange cylinder is constructed as a cylinder having a medium cavity interlayer, and the medium cavity of each heat exchange cylinder is filled with a heat exchange medium, and a conveying channel (200) for sand to pass through is provided between two adjacent heat exchange cylinders or between the heat exchange cylinder and the cooling cylinder (10), so that the sand entering the feed cylinder (101) passes through the conveying channel (200) and is discharged from the discharge cylinder (102), and contacts with the heat exchange cylinder for heat exchange when being transported in the conveying channel (200).

2. The cooling device for coated sand according to claim 1, characterized in that: The heat exchange roller (20) comprises a first heat exchange cylinder (21), a second heat exchange cylinder (22) and a third heat exchange cylinder (23) which are coaxially arranged from the inside to the outside. The first heat exchange cylinder (21) comprises a first inner cylinder (211) and a first outer cylinder (212) which are coaxially arranged. A first medium cavity (210) for filling a heat exchange medium is provided between the first inner cylinder (211) and the first outer cylinder (212). The second heat exchange cylinder (22) comprises a second inner cylinder (221) and a second outer cylinder (222) which are coaxially arranged. A second medium cavity (210) for filling a heat exchange medium is provided between the second inner cylinder (221) and the second outer cylinder (222). The heat exchange cylinder (23) comprises a third inner cylinder (231) and a third outer cylinder (232) which are coaxially distributed, a third medium cavity (230) for filling heat exchange medium is provided between the third inner cylinder (231) and the third outer cylinder (232), the delivery channel (200) is provided between the first outer cylinder (212) and the second inner cylinder (221), between the third inner cylinder (231) and the second outer cylinder (222), and between the third outer cylinder (232) and the inner wall of the cooling cylinder (10), and the thickness of the three delivery channels (200) is consistent.

3. The cooling device for coated sand according to claim 2, characterized in that: On one side close to the feed cylinder (101), the distances between the first heat exchange cylinder (21), the second heat exchange cylinder (22) and the third heat exchange cylinder (23) and the end surface of the cooling cylinder (10) decrease step by step from the outside to the inside in the axial direction; a first connecting cylinder (233) is provided between the end surface of the third heat exchange cylinder (23) and the cooling cylinder (10); a first material leakage window (2330) is provided on the first connecting cylinder (233); a second connecting cylinder (223) is provided between the second heat exchange cylinder (22) and the end surface of the cooling cylinder (10); a second material leakage window (2230) is provided on the second connecting cylinder (223), so that the sand material entering the feed cylinder (101) can enter the three conveying channels (200) through the first material leakage window (2330) and the second material leakage window (2230).

4. The cooling device for coated sand according to claim 3, characterized in that: The outer side walls of the first heat exchange tube (21), the second heat exchange tube (22) and the third heat exchange tube (23) are each provided with a plurality of guide fins (202) distributed in a centrally symmetrical manner around an axis, the guide fins (202) being configured to feed the sand material in the conveying channel (200) from the feed tube (101) to the discharge tube (102), and on a side close to the discharge tube (102), the second heat exchange tube (22) and the third heat exchange tube (23) are each provided with a discharge window (201), the discharge window (201) being used to connect the three conveying channels (200) so that the sand material in the conveying channels (200) can be discharged from the discharge tube (102).

5. The cooling device for coated sand according to claim 3, characterized in that: A driven wheel group (40) is provided on one end of the cooling cylinder (10) close to the feeding cylinder (101), and the driven wheel group (40) comprises a first driven wheel (41), a second driven wheel (42) and a third driven wheel (43) which are coaxially distributed from the inside to the outside. The first driven wheel (41), the second driven wheel (42), the third driven wheel (43) and the cooling cylinder (10) are rotatably connected to each other. The first driven wheel (41) is fixedly connected to the end of the first heat exchange cylinder (21), the second driven wheel (42) is fixedly connected to the end of the second connecting cylinder (223), and the third driven wheel (43) is fixedly connected to the end of the first connecting cylinder (233). The driver (30) can simultaneously drive the first driven wheel (41), the second driven wheel (42) and the third driven wheel (43) to rotate, and there is a speed difference between the first driven wheel (41), the second driven wheel (42) and the third driven wheel (43).

6. The cooling device for coated sand according to claim 5, characterized in that: The driver (30) comprises a motor (31) fixed to the bottom of the cooling cylinder (10), a drive shaft (32) being fixedly provided at the output end of the motor (31), and a transmission belt (33) being installed at each of the drive shaft (32) corresponding to the first driven wheel (41), the second driven wheel (42) and the third driven wheel (43), so that the transmission belt (33) can simultaneously drive the first driven wheel (41), the second driven wheel (42) and the third driven wheel (43) to rotate.

7. The cooling device for coated sand according to claim 6, characterized in that: The diameters of the first driven wheel (41), the second driven wheel (42) and the third driven wheel (43) increase step by step, and the rotation speeds of the first driven wheel (41), the second driven wheel (42) and the third driven wheel (43) decrease step by step.

8. The cooling device for coated sand according to claim 2, characterized in that: A sealing cover (50) is provided on one end of the cooling cylinder (10) close to the discharge cylinder (102); end surfaces of the first heat exchange cylinder (21), the second heat exchange cylinder (22) and the third heat exchange cylinder (23) are rotatably mounted on the sealing cover (50); and the first medium cavity (210), the second medium cavity (220) and the third medium cavity (230) are sealed by the sealing cover (50).

9. The cooling device for coated sand according to claim 8, characterized in that: The sealing cover (50) comprises a cover plate (51), and a liquid separator ring (54) is fixedly provided on the outer surface of the cover plate (51) at locations corresponding to the first heat exchange cylinder (21), the second heat exchange cylinder (22), and the third heat exchange cylinder (23). The liquid separator ring (54) is provided with a pipe joint (541) connected to an external liquid pump device. A plurality of pipe groups are provided on one side of the cover plate (51) facing the first heat exchange cylinder (21), the second heat exchange cylinder (22), and the third heat exchange cylinder (23). Each of the pipe groups comprises a return pipe (52) and a liquid supply pipe (53). The liquid supply pipe (53) is configured to introduce a heat exchange medium into the medium cavity, and the return pipe (52) is configured to extract the heat exchange medium from the medium cavity, so that the heat transfer medium circulates in the medium cavity.

10. The cooling device for coated sand according to claim 9, characterized in that: A plurality of medium guide strips (60) parallel to the axis are arranged in the medium cavity along the circumferential direction, a slot (511) for clamping the medium guide strips (60) is provided on the cover plate (51), and the length of the medium guide strips (60) is less than the length of the heat exchange cavity, a medium channel (600) is provided between any two adjacent medium guide strips (60), the return pipes (52) and the liquid supply pipes (53) are alternately distributed in the plurality of medium channels (600), and every two adjacent medium channels (600) form a "U"-shaped circulation loop with the return pipe (52) and the liquid supply pipe (53).

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