Lost foam casting sand cooling equipment

Abstract

The invention relates to the technical field of casting sand cooling equipment, in particular to lost foam casting sand cooling equipment which comprises a rack, a first conveying auger, a separation assembly, a first liquid cooling assembly, a second liquid cooling assembly and a controller, the first conveying auger is arranged on the rack, and the axis of the first conveying auger is horizontal. According to the device, the separation assembly, the first liquid cooling assembly and the second liquid cooling assembly are arranged, the expansion degrees of casting sand at different temperatures in the circumferential direction of the expansion section are different, and therefore the circumferential expansion degrees of the auger barrel of the expansion section are different; and the first discharging barrel or the second discharging barrel is selectively opened, so that the foundry sand with different temperatures is conveyed into the first liquid cooling assembly and the second liquid cooling assembly correspondingly, the foundry sand is cooled through the first liquid cooling assembly and the second liquid cooling assembly with different cooling liquid temperatures correspondingly, and the cooling uniformity of the foundry sand is improved conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of foundry sand cooling equipment, in particular to lost foam foundry sand cooling equipment. Background Art

[0002] Lost foam casting, also known as vaporization mold casting, is a casting process without parting surface and sand core. In this process, the model is usually made of foam plastic, and then the foam model vaporizes and disappears during pouring, and the molten metal directly occupies the original space of the model to form a casting. Therefore, lost foam casting has special requirements for the selection of casting sand. The casting sand suitable for lost foam casting is mainly resin sand. This is because resin sand is a combination of quartz sand and resin, with good fluidity, formability and self-hardening properties, and can accurately replicate the delicate structure of the foam model to ensure the dimensional accuracy and surface finish of the casting.

[0003] After casting, cooling equipment is needed to quickly cool the casting sand in order to improve production efficiency. The existing Chinese utility model patent with authorization announcement number CN218775606U discloses a lost foam casting sand cooling device, which realizes rapid cooling and impurity filtration of the molding sand by setting a cooling pipe and a conveying pipe in a cooling water tank, opening filter holes and setting spiral conveying blades on the conveying pipe, which not only improves the discharge speed, but also improves the overall convenience and practicality of use.

[0004] However, the above-mentioned disclosed scheme has the following shortcomings: when the size of the casting is large, the thickness of the casting sand mold is thicker, and the inner layer of the casting sand is directly in contact with the high-temperature casting, so the temperature is higher, while the outer layer of the casting sand is in contact with the air and cools faster, so the temperature is lower, and the thicker the casting sand, the greater the temperature difference between the inner and outer layers of the casting sand. The above scheme is to mix the casting sands of different temperatures together and transport them to the screw conveyor, which will also cause poor cooling uniformity of the casting sand. The cooled casting sand needs to be preheated and stirred before it can be used for sand casting. Summary of the invention

[0005] Based on this, it is necessary to provide a lost foam casting sand cooling device to solve the problem of poor cooling uniformity of the existing lost foam casting sand in view of the problems existing in the current casting sand cooling device.

[0006] The above purpose is achieved through the following technical solutions: A lost foam casting sand cooling device comprises: frame; A first conveying auger, the first conveying auger is arranged on the frame, and the axis of the first conveying auger is horizontal; A separation component, the separation component comprises a box body, a second conveying auger and a pressure sensor, the box body is arranged at the discharge end of the first conveying auger, the second conveying auger is arranged in the box body, the axis of the second conveying auger is vertical, the second conveying auger is divided into a reduction section, an expansion section and an expansion section from bottom to top, the auger diameter of the reduction section gradually decreases from bottom to top, the auger diameter of the expansion section remains unchanged from bottom to top, and the auger diameter of the expansion section gradually increases from bottom to top, the pressure sensor is arranged on the inner peripheral wall of the box body, and the sensing end of the pressure sensor is in contact with the outer peripheral wall of the auger barrel of the expansion section; A first discharging cylinder is arranged at one side of the auger cylinder of the enlarged section and is connected to the auger cylinder of the enlarged section. The axis of the first discharging cylinder is inclined downward, and a first solenoid valve is arranged on the first discharging cylinder; A second discharge barrel, which is arranged on the other side of the auger barrel of the enlarged section and is communicated with the auger barrel of the enlarged section. The axis of the second discharge barrel is inclined downward, and a second solenoid valve is arranged on the second discharge barrel; A controller, the controller is used to receive the pressure value detected by the pressure sensor and control the opening / closing of the first solenoid valve / the second solenoid valve; When the pressure value is greater than the preset value, the controller controls the first solenoid valve to open and the second solenoid valve to close; When the pressure value is not greater than the preset value, the controller controls the first solenoid valve to close and the second solenoid valve to open; A first liquid cooling component, which is arranged below the first discharge barrel and is used to receive the foundry sand flowing out of the first discharge barrel and cool the foundry sand; A second liquid cooling assembly is disposed below the second discharge barrel and is used to receive the foundry sand flowing out of the second discharge barrel and cool the foundry sand; The temperature of the coolant of the first liquid-cooling component is not greater than the temperature of the coolant of the second liquid-cooling component.

[0007] In one embodiment, ventilation holes are evenly opened on the peripheral walls of the auger barrels of the reduction section and the expansion section; An air suction fan is provided on the inner peripheral wall of the box body and in the area corresponding to the reduced section, and the air suction fan is used to discharge the air in the lower area of ​​the box body out of the box body; An air blower is provided on the inner peripheral wall of the box body and in the area corresponding to the enlarged section, and the air blower is used to suck the air outside the box body into the upper area inside the box body; Isolation plates are arranged on the inner peripheral wall of the box body at the junction of the reduction section and the expansion section and at the junction of the expansion section and the expansion section.

[0008] In one embodiment, the first liquid cooling assembly includes a liquid cooling circulation box, a condenser, a plurality of first cooling tubes and a plurality of second cooling tubes, the liquid cooling circulation box contains cooling liquid, the axes of the plurality of first cooling tubes and the plurality of second cooling tubes are parallel to each other and are located in the same vertical plane, and the plurality of first cooling tubes and the plurality of second cooling tubes are alternately arranged from top to bottom; Both ends of the first cooling tube and the second cooling tube pass through the liquid cooling circulation box, and the condenser is arranged at the lower part of the liquid cooling circulation box and connected to the liquid cooling circulation box, and is used to cool down the coolant in the liquid cooling circulation box; The foundry sand flowing out of the first discharge barrel can flow between the first cooling tubes and the second cooling tubes in a serpentine motion trajectory.

[0009] In one embodiment, a first feed port is provided at an upper portion of one end of the first cooling tube, and a first discharge port is provided at a lower portion of the other end of the first cooling tube; A second discharge port is provided at the lower part of one end of the second cooling tube and located directly below the first feed port, and a second feed port is provided at the upper part of the other end of the second cooling tube and located directly below the first discharge port.

[0010] In one embodiment, the first cooling tube comprises a driving ring, a driven ring and a tube body, both ends of the tube body pass through the liquid cooling circulation box, the driving ring is rotatably connected to the inner circumference wall of one end of the tube body, the driven ring is rotatably connected to the inner circumference wall of the other end of the tube body, and a spiral spring bar is connected between the driving ring and the driven ring; The drive ring is capable of rotating about its axis; The driving ring and the driven ring are provided with concentric holes in their centers, and air cooling pipes are rotatably connected in the concentric holes; The spiral spring bar is in rotational contact with the outer peripheral wall of the air cooling tube and the inner peripheral wall of the first cooling tube.

[0011] In one of the embodiments, a ball head protrusion is provided on the inner circumferential wall of the tube body and the outer circumferential wall of the air cooling tube, there are multiple ball head protrusions, and the multiple ball head protrusions are arranged at intervals along the axis of the tube body.

[0012] In one of the embodiments, a transmission tube is coaxially arranged at one end of the driving ring away from the spiral spring bar, and exhaust holes are circumferentially and evenly spaced on the outer wall of the transmission tube. A motor bracket is arranged on the outside of the liquid cooling circulation box, and a first driving motor is arranged on the motor bracket. The output end of the first driving motor is coaxially and fixedly connected to the transmission tube.

[0013] In one of the embodiments, a cooling air blower is provided on the liquid cooling circulation box, and an output end of the cooling air blower is connected to one end of the air cooling pipe for conveying cold air into the air cooling pipe.

[0014] In one embodiment, the first cooling tube and the second cooling tube have the same internal structure.

[0015] In one embodiment, the first liquid cooling component and the second liquid cooling component have the same structure.

[0016] The beneficial effects of the present invention are: The present invention is provided with a separation component, a first liquid-cooling component and a second liquid-cooling component. The casting sand is first compacted by the reduction section of the separation component, and then the casting sand is continuously conveyed to the expansion section. At this time, the casting sand of different temperatures has different expansion degrees in the circumferential direction of the expansion section, which also makes the circumferential expansion degrees of the auger barrel of the expansion section different. According to the different circumferential expansion degrees of the auger barrel of the expansion section, the first discharge barrel or the second discharge barrel is selectively opened to facilitate conveying the casting sand of different temperatures to the first liquid-cooling component and the second liquid-cooling component respectively. The casting sand is cooled and lowered by the first liquid-cooling component and the second liquid-cooling component with different coolant temperatures respectively, so as to improve the cooling uniformity of the casting sand, so that the temperature difference of the cooled casting sand is smaller, so that the cooled casting sand can be used for sand casting again more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of a lost foam casting sand cooling device of the present invention; Figure 2 A top view of a cooling device for lost foam casting sand according to the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 A top view of a first conveying auger and a separation component in a lost foam casting sand cooling device of the present invention; Figure 5 for Figure 4 Middle BB section view; Figure 6 It is a schematic diagram of the arrangement positions of the first cooling pipe and the second cooling pipe in a cooling device for lost foam casting sand of the present invention; Figure 7 This is a structural diagram of a first cooling pipe in a cooling device for lost foam casting sand according to the present invention; Figure 8 for Figure 7 Axonometric view of the middle CC half section; Fig. 9 for Figure 8 Schematic diagram of the enlarged structure at D in the middle; Fig.10 The present invention is a structural diagram of a second cooling pipe in a lost foam casting sand cooling device.

[0018] in: 100, frame; 200, first conveying auger; 210, feed hopper; 300, separation assembly; 310, box; 320, second conveying auger; 321, reduction section; 322, expansion section; 323, expansion section; 330, pressure sensor; 340, first discharge barrel; 350, second discharge barrel; 360, suction fan; 370, blowing fan; 380, isolation plate; 400, first liquid cooling assembly; 410, liquid cooling circulation box; 420, cooling Condenser; 430, first cooling pipe; 431, first feed port; 432, first discharge port; 433, drive ring; 434, driven ring; 435, tube body; 436, spiral spring bar; 437, air cooling pipe; 438, ball head protrusion; 439, transmission pipe; 4391, exhaust hole; 440, second cooling pipe; 441, second discharge port; 442, second feed port; 500, second liquid cooling assembly; 610, motor bracket; 620, first drive motor. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is 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 a limitation to the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is not higher in level than the second feature.

[0022] like Figure 1-Figure 10 As shown, a lost foam casting sand cooling device includes a frame 100, a first conveying auger 200, a separation component 300, a first liquid cooling component 400, a second liquid cooling component 500 and a controller. The first conveying auger 200 is arranged on the frame 100, and the axis of the first conveying auger 200 is horizontal. The first conveying auger 200 is used to convey the casting sand to be cooled to the separation component 300. The separation component 300 includes a box 310, a second conveying auger 320 and a pressure sensor 330. The box 310 is arranged at the discharge end of the first conveying auger 200, the second conveying auger 320 is arranged in the box 310, and the second The axis of the conveying auger 320 is vertical, and the lower end of the second conveying auger 320 is connected to the first conveying auger 200, so that the first conveying auger 200 can convey the casting sand to the second conveying auger 320. The second conveying auger 320 is divided into a reduction section 321, an expansion section 322 and an expansion section 323 from bottom to top. The auger diameter of the reduction section 321 gradually decreases from bottom to top, the auger diameter of the expansion section 322 remains unchanged from bottom to top, and the auger diameter of the expansion section 323 gradually increases from bottom to top. The pressure sensor 330 is arranged on the inner peripheral wall of the box body 310, and the sensing end of the pressure sensor 330 is connected to the expansion section 3 The first discharge barrel 340 is arranged on one side of the auger barrel of the enlarged section 323 and is communicated with the auger barrel of the enlarged section 323. The axis of the first discharge barrel 340 is inclined downward. A first solenoid valve is arranged on the first discharge barrel 340. The second discharge barrel 350 is arranged on the other side of the auger barrel of the enlarged section 323 and is communicated with the auger barrel of the enlarged section 323. The axis of the second discharge barrel 350 is inclined downward. A second solenoid valve is arranged on the second discharge barrel 350. The controller is used to receive the pressure value detected by the pressure sensor 330, and to control the opening / closing of the first solenoid valve / the second solenoid valve Closed. When the pressure value is greater than the preset value, the controller controls the first solenoid valve to open and the second solenoid valve to close. When the pressure value is not greater than the preset value, the controller controls the first solenoid valve to close and the second solenoid valve to open. The first liquid cooling component 400 is arranged below the first discharge barrel 340 for receiving the casting sand flowing out of the first discharge barrel 340 and cooling the casting sand. The second liquid cooling component 500 is arranged below the second discharge barrel 350 for receiving the casting sand flowing out of the second discharge barrel 350 and cooling the casting sand. The coolant temperature of the first liquid cooling component 400 is not greater than the coolant temperature of the second liquid cooling component 500.

[0023] When in use, the staff first conveys the foundry sand to be cooled into the first conveying auger 200, and then rotates the first conveying auger 200 to convey the foundry sand into the reduction section 321 of the second conveying auger 320 through the rotation of the first conveying auger 200. In addition, the rotation of the first conveying auger 200 can also break up the blocky foundry sand. After the foundry sand enters the reduction section 321, the diameter of the auger barrel of the reduction section 321 gradually decreases from bottom to top, so the foundry sand entering the reduction section 321 is gradually compacted. When the compacted foundry sand enters the expansion section 322, the foundry sand has been compacted. The thermal expansion of the high-temperature foundry sand causes the expansion section 322 of the second conveying auger 320 to be forced to expand in a direction away from the axis of the second conveying auger 320. At this time, the auger cylinder of the expansion section 322 increases the pressure on the pressure sensor 330, and the pressure value detected by the pressure sensor 330 increases. Since the expansion degree of foundry sands at different temperatures is different, the expansion degree of the expansion section 322 of the second conveying auger 320 is different for foundry sands at different temperatures, and the pressure value detected by the pressure sensor 330 is also different. The controller is used to receive the pressure value detected by the pressure sensor 330. When the pressure value is greater than the preset value, it indicates that the expansion The temperature of the casting sand in the expansion section 322 is relatively high. At this time, the controller controls the first solenoid valve to open and the second solenoid valve to close. After the casting sand inside the expansion section 322 enters the expansion section 323, the casting sand further enters the first liquid cooling component 400 through the first discharge cylinder 340. The casting sand with a relatively high temperature is cooled by the coolant in the first liquid cooling component 400. When the pressure value is not greater than the preset value, it means that the temperature of the casting sand inside the expansion section 322 is relatively low. At this time, the controller controls the second solenoid valve to open and the first solenoid valve to close. After the casting sand inside the expansion section 322 enters the expansion section 323, the casting sand enters The sand is cooled by the cooling liquid in the second liquid cooling component 500. Since the temperature of the cooling liquid in the first liquid cooling component 400 is lower than that of the cooling liquid in the second liquid cooling component 500, the first liquid cooling component 400 cools the high-temperature sand and the second liquid cooling component 500 cools the low-temperature sand according to the different temperatures of the casting sand. This can improve the cooling uniformity of the casting sand and make the temperature difference of the cooled casting sand smaller, so that the cooled casting sand can be used for sand casting again more quickly.

[0024] It is understandable that the reason why the foundry sand is first compacted through the reduction section 321 instead of directly sending the foundry sand into the expansion section 322 is to gradually compact the foundry sand entering into the reduction section 321 through the gradually shrinking diameter of the auger in the reduction section 321, so that the compacted foundry sand can only expand circumferentially outward due to heat, so that the thermal expansion of the foundry sand is more significantly reflected in the circumferential direction of the expansion section 322, thereby pushing the auger of the expansion section 322 to expand outward through the thermal expansion of the foundry sand.

[0025] It is understandable that when the thickness of the foundry sand mold is thicker, the foundry sand close to the casting is in direct contact with the high-temperature casting, and its temperature is usually higher than 500°C, while the outer layer of foundry sand is in direct contact with the air, and its temperature is usually lower than 200°C. After the casting is completed, workers usually break up the foundry sand and take out the casting from the foundry sand. The broken foundry sand is not evenly mixed together, so the temperature of the foundry sand is not the same, but some foundry sands have high temperatures and some foundry sands have low temperatures.

[0026] It should also be added that the reason why the feed port of the second conveying auger 320 is located at the lower part and the discharge port of the second conveying auger 320 is located at the upper part is to reduce the downward axial expansion of the casting sand inside the expansion section 322 by the upward squeezing force of the casting sand inside the reduction section 321, and at the same time, reduce the upward axial expansion of the casting sand in the expansion section 322 by the gravity of the casting sand in the expansion section 323, so that the thermal expansion of the casting sand in the expansion section 322 is more significant in the circumferential direction of the auger barrel of the expansion section 322.

[0027] It should also be noted that a feed hopper 210 is provided on the side of the first conveying auger 200 away from the second conveying auger 320 to facilitate the staff to convey the casting sand into the first conveying auger 200 .

[0028] In a further embodiment, Figure 5 As shown, ventilation holes are evenly provided on the peripheral walls of the auger cylinders of the reduction section 321 and the expansion section 323; an air suction fan 360 is provided on the inner peripheral wall of the box body 310 and in the area corresponding to the reduction section 321, and the air suction fan 360 is used to discharge the air in the lower area of ​​the box body 310 out of the box body 310; an air blowing fan 370 is provided on the inner peripheral wall of the box body 310 and in the area corresponding to the expansion section 323, and the air blowing fan 370 is used to suck the air outside the box body 310 into the upper area of ​​the box body 310; isolation plates 380 are provided on the inner peripheral wall of the box body 310 and at the junction of the reduction section 321 and the expansion section 322 and at the junction of the expansion section 323 and the expansion section 322.

[0029] When the foundry sand is in the area where the reduced section 321 is located, as the foundry sand is gradually transported upward, the diameter of the auger of the reduced section 321 is reduced, and the hot air in the foundry sand is squeezed out of the auger of the reduced section 321 through the vents, and the hot air is further discharged to the outside of the box 310 through the suction fan 360, so as to reduce the heat in the foundry sand and perform preliminary heat dissipation on the foundry sand. After the foundry sand is transported to the area where the expanded section 323 is located, as the foundry sand is gradually transported upward, the diameter of the auger of the expanded section 323 increases. At this time, under the action of the blowing fan 370, the air outside the box 310 enters the inside of the box 310 and enters the inside of the expanded section 323 through the vents on the peripheral wall of the auger of the expanded section 323.

[0030] It should be supplemented that the air entering the expansion section 323 has three functions. The first function is to gradually loosen the casting sand through the action of airflow. The second function is to further dissipate the heat of the casting sand. The third function is to provide an external driving force for the flow of the casting sand in the first discharge barrel 340 or the second discharge barrel 350, so that the casting sand can flow out from the first discharge barrel 340 or the second discharge barrel 350 smoothly.

[0031] It should also be noted that the isolation plate 380 is provided to isolate the area where the expansion section 323 is located from the area where the reduction section 321 is located, so as to avoid the formation of an air flow cycle between the blowing fan 370 and the suction fan 360, thereby reducing the effect of the air flow on the casting sand in the reduction section 321 and the expansion section 323.

[0032] In a further embodiment, Figure 1 and Figure 6 As shown, the first liquid cooling component 400 includes a liquid cooling circulation box 410, a condenser 420, a plurality of first cooling tubes 430 and a plurality of second cooling tubes 440, the liquid cooling circulation box 410 is filled with cooling liquid, the axes of the plurality of first cooling tubes 430 and the plurality of second cooling tubes 440 are parallel to each other and are located in the same vertical plane, and the plurality of first cooling tubes 430 and the plurality of second cooling tubes 440 are alternately arranged from top to bottom; both ends of the first cooling tubes 430 and the second cooling tubes 440 pass through the liquid cooling circulation box 410, the condenser 420 is arranged at the lower part of the liquid cooling circulation box 410 and the condenser 420 is connected to the liquid cooling circulation box 410, and is used to cool down the cooling liquid in the liquid cooling circulation box 410; the casting sand flowing out of the first discharging barrel 340 can flow between the first cooling tubes 430 and the second cooling tubes 440 in a serpentine motion trajectory.

[0033] When in use, the condenser 420 is started, and the coolant in the liquid cooling circulation box 410 is cooled by the condenser 420 so that the temperature of the coolant in the liquid cooling circulation box 410 is maintained within the set cooling temperature range, and then the casting sand flowing out of the first discharge barrel 340 flows in a serpentine motion trajectory between a plurality of first cooling tubes 430 and second cooling tubes 440. In this process, the heat in the casting sand is absorbed by the coolant in the form of heat transfer, so that the temperature of the casting sand is reduced.

[0034] It should be noted that the reason why the foundry sand flows in a serpentine motion trajectory between the first cooling tubes 430 and the second cooling tubes 440 is to increase the cooling time of the foundry sand in the liquid cooling circulation box 410 so as to cool the foundry sand to a desired temperature range.

[0035] In a further embodiment, Figure 8 and Fig.10 As shown, a first feed port 431 is provided at the upper portion of one end of the first cooling tube 430, and a first discharge port 432 is provided at the lower portion of the other end of the first cooling tube 430; a second discharge port 441 is provided at the lower portion of one end of the second cooling tube 440 and directly below the first feed port 431, and a second feed port 442 is provided at the upper portion of the other end of the second cooling tube 440 and directly below the first discharge port 432.

[0036] During use, after the casting sand flows out from the first discharge barrel 340 or the second discharge barrel 350, the casting sand flows into the first cooling tube 430 through the first feed port 431 under the action of gravity. After entering the first cooling tube 430, the casting sand continues to flow forward along the axis of the first cooling tube 430 to the location of the first discharge port 432. At this time, the casting sand flows down from the first discharge port 432 under the action of gravity and enters the second discharge barrel 350 through the second feed port 442. After entering the second cooling tube 440, the casting sand continues to flow forward along the axis of the second cooling tube 440 to the location of the second discharge port 441. At this time, the casting sand enters the first cooling tube 430 through the second discharge port 441 and the first feed port 431 corresponding to the first cooling tube 430 below the second cooling tube 440. In this way, the casting sand flows between the first cooling tubes 430 and the second cooling tubes 440 in a serpentine motion trajectory.

[0037] In a further embodiment, Figure 8 and Fig. 9As shown, the first cooling tube 430 includes a driving ring 433, a driven ring 434 and a tube body 435, both ends of the tube body 435 pass through the liquid cooling circulation box 410, the driving ring 433 is rotatably connected to the inner circumferential wall of one end of the tube body 435, the driven ring 434 is rotatably connected to the inner circumferential wall of the other end of the tube body 435, a spiral spring bar 436 is connected between the driving ring 433 and the driven ring 434, the spiral spring bar 436 is in rotational contact with the outer circumferential wall of the air-cooling tube 437 and the inner circumferential wall of the first cooling tube 430, the driving ring 433 can rotate around its axis, the driving ring 433 and the driven ring 434 are provided with concentric holes in the centers, the air-cooling tube 437 is rotatably connected in the concentric holes, an air cooler is provided on the liquid cooling circulation box 410, the output end of the air cooler is connected to one end of the air-cooling tube 437, for conveying cold air into the air-cooling tube 437.

[0038] When in use, the cooling fan is started, and the driving ring 433 is rotated around its axis. Under the driving action of the driving ring 433, the driving ring 433 drives the spiral spring bar 436 to rotate, and the spiral spring bar 436 drives the driven ring 434 to rotate. Under the driving action of the spiral spring bar 436, the casting sand flowing into the first cooling tube 430 is directed from the end where the first feed port 431 is located to the end where the first discharge port 432 is located. In the process of the directional movement of the casting sand, the cooling liquid outside the tube body 435 is in the form of heat transfer. The heat in the foundry sand is gradually absorbed through the tube body 435, so that the temperature of the foundry sand around the tube body 435 is reduced. At the same time, under the action of the air cooler, the cold air outside the liquid cooling circulation box 410 flows from one end of the first cooling tube 430 to the other end. In this process, the heat in the foundry sand is absorbed by the cold air through the tube body 435, so that the temperature of the foundry sand around the air-cooling tube 437 is reduced. This is to make the cooling uniformity of the foundry sand between the air-cooling tube 437 and the tube body 435 better.

[0039] It should also be noted that, in this embodiment, the cold air blown into the air cooling pipe 437 by the air cooler can be humidified so that the cold air can have a better cooling effect on the casting sand.

[0040] In a further embodiment, Fig. 9 As shown, ball head protrusions 438 are provided on the inner circumferential wall of the tube body 435 and the outer circumferential wall of the air cooling tube 437 . There are multiple ball head protrusions 438 , and the multiple ball head protrusions 438 are arranged at intervals along the axis of the tube body 435 .

[0041] During the continuous rotation of the spiral spring bar 436, the spiral spring bar 436 intermittently contacts the ball head protrusion 438 on the outer circumference of the air-cooling tube 437 and the ball head protrusion 438 on the inner circumference of the tube body 435. After the spiral spring bar 436 contacts the ball head protrusion 438, the spiral spring bar 436 is deformed by the squeezing action of the ball head protrusion 438. As the spiral spring bar 436 continues to rotate, after the spiral spring bar 436 loses contact with the ball head protrusion 438, the spiral spring bar 436 elastically returns to its original position. During the elastic return of the spiral spring bar 436, the spiral spring bar 436 generates an impact force on the tube body 435 and the air-cooling tube 437, so that the temperature boundary layer on the outer circumferential wall of the tube body 435 and the inner circumferential wall of the air-cooling tube 437 can be destroyed by the vibration generated by the impact force, so as to improve the heat exchange efficiency.

[0042] In a further embodiment, Figure 6 and Fig. 9 As shown, a transmission tube 439 is coaxially arranged at one end of the driving ring 433 away from the spiral spring bar 436, and exhaust holes 4391 are circumferentially and evenly spaced on the outer wall of the transmission tube 439. A motor bracket 610 is arranged on the outside of the liquid cooling circulation box 410, and a first driving motor 620 is arranged on the motor bracket 610. The output end of the first driving motor 620 is coaxially fixedly connected to the transmission tube 439.

[0043] When the driving ring 433 is rotated around its axis, the first driving motor 620 is started, and the first driving motor 620 drives the driving ring 433 to rotate through the transmission tube 439 , thereby driving the spiral spring bar 436 to rotate through the driving ring 433 .

[0044] It should also be noted that if Fig. 9 As shown, the exhaust hole 4391 is used to allow the cold air entering the transmission pipe 439 to be discharged outward through the exhaust hole 4391, so as to make the cold air flow in the transmission pipe 439 in a direction.

[0045] In a further embodiment, Figure 6 As shown, the internal structures of the first cooling tube 430 and the second cooling tube 440 are the same.

[0046] In a further embodiment, Figure 1 As shown, the first liquid cooling assembly 400 and the second liquid cooling assembly 500 have the same structure.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A lost foam casting sand cooling device, characterized in that: include: frame; A first conveying auger, the first conveying auger is arranged on the frame, and the axis of the first conveying auger is horizontal; A separation component, the separation component comprises a box body, a second conveying auger and a pressure sensor, the box body is arranged at the discharge end of the first conveying auger, the second conveying auger is arranged in the box body, the axis of the second conveying auger is vertical, the second conveying auger is divided into a reduction section, an expansion section and an expansion section from bottom to top, the auger diameter of the reduction section gradually decreases from bottom to top, the auger diameter of the expansion section remains unchanged from bottom to top, and the auger diameter of the expansion section gradually increases from bottom to top, the pressure sensor is arranged on the inner peripheral wall of the box body, and the sensing end of the pressure sensor is in contact with the outer peripheral wall of the auger barrel of the expansion section; A first discharging cylinder is arranged at one side of the auger cylinder of the enlarged section and is connected to the auger cylinder of the enlarged section. The axis of the first discharging cylinder is inclined downward, and a first solenoid valve is arranged on the first discharging cylinder; A second discharge barrel, which is arranged on the other side of the auger barrel of the enlarged section and is communicated with the auger barrel of the enlarged section. The axis of the second discharge barrel is inclined downward, and a second solenoid valve is arranged on the second discharge barrel; A controller, the controller is used to receive the pressure value detected by the pressure sensor and control the opening / closing of the first solenoid valve / the second solenoid valve; When the pressure value is greater than the preset value, the controller controls the first solenoid valve to open and the second solenoid valve to close; When the pressure value is not greater than the preset value, the controller controls the first solenoid valve to close and the second solenoid valve to open; A first liquid cooling component, which is arranged below the first discharge barrel and is used to receive the foundry sand flowing out of the first discharge barrel and cool the foundry sand; A second liquid cooling assembly is disposed below the second discharge barrel and is used to receive the foundry sand flowing out of the second discharge barrel and cool the foundry sand; The temperature of the coolant of the first liquid-cooling component is not greater than the temperature of the coolant of the second liquid-cooling component.

2. The lost foam casting sand cooling device according to claim 1, characterized in that: Ventilation holes are evenly provided on the peripheral walls of the auger barrels of the shrinking section and the expanding section; An air suction fan is provided on the inner peripheral wall of the box body and in the area corresponding to the reduced section, and the air suction fan is used to discharge the air in the lower area of ​​the box body out of the box body; An air blower is provided on the inner peripheral wall of the box body and in the area corresponding to the enlarged section, and the air blower is used to suck the air outside the box body into the upper area inside the box body; Isolation plates are arranged on the inner peripheral wall of the box body at the junction of the reduction section and the expansion section and at the junction of the expansion section and the expansion section.

3. The lost foam casting sand cooling device according to claim 1, characterized in that: The first liquid cooling assembly includes a liquid cooling circulation box, a condenser, a plurality of first cooling tubes and a plurality of second cooling tubes, the liquid cooling circulation box contains cooling liquid, the axes of the plurality of first cooling tubes and the plurality of second cooling tubes are parallel to each other and are located in the same vertical plane, and the plurality of first cooling tubes and the plurality of second cooling tubes are alternately arranged from top to bottom; Both ends of the first cooling tube and the second cooling tube pass through the liquid cooling circulation box, and the condenser is arranged at the lower part of the liquid cooling circulation box and connected to the liquid cooling circulation box, and is used to cool down the coolant in the liquid cooling circulation box; The foundry sand flowing out of the first discharge barrel can flow between the first cooling tubes and the second cooling tubes in a serpentine motion trajectory.

4. The lost foam casting sand cooling device according to claim 3, characterized in that: A first feed inlet is provided at the upper portion of one end of the first cooling tube, and a first discharge outlet is provided at the lower portion of the other end of the first cooling tube; A second discharge port is provided at the lower part of one end of the second cooling tube and located directly below the first feed port, and a second feed port is provided at the upper part of the other end of the second cooling tube and located directly below the first discharge port.

5. The lost foam casting sand cooling device according to claim 4, characterized in that: The first cooling tube comprises a driving ring, a driven ring and a tube body, both ends of the tube body pass through the liquid cooling circulation box, the driving ring is rotatably connected to the inner circumference wall of one end of the tube body, the driven ring is rotatably connected to the inner circumference wall of the other end of the tube body, and a spiral spring bar is connected between the driving ring and the driven ring; The drive ring is capable of rotating about its axis; The driving ring and the driven ring are provided with concentric holes at their centers, and air cooling pipes are rotatably connected in the concentric holes; The spiral spring bar is in rotational contact with the outer peripheral wall of the air cooling tube and the inner peripheral wall of the first cooling tube.

6. The lost foam casting sand cooling device according to claim 5, characterized in that: The inner peripheral wall of the tube body and the outer peripheral wall of the air cooling tube are both provided with ball head protrusions, there are a plurality of ball head protrusions, and the plurality of ball head protrusions are arranged at intervals along the axis of the tube body.

7. The lost foam casting sand cooling device according to claim 5, characterized in that: A transmission tube is coaxially arranged at one end of the driving ring away from the spiral spring bar, and exhaust holes are circumferentially and evenly spaced on the outer wall of the driving tube. A motor bracket is arranged outside the liquid cooling circulation box, and a first driving motor is arranged on the motor bracket. The output end of the first driving motor is coaxially and fixedly connected with the transmission tube.

8. The lost foam casting sand cooling device according to claim 3, characterized in that: The liquid cooling circulation box is provided with an air cooler, and the output end of the air cooler is connected with one end of the air cooling pipe for conveying cold air into the air cooling pipe.

9. The lost foam casting sand cooling device according to claim 3, characterized in that: The first cooling tube and the second cooling tube have the same internal structure.

10. The lost foam casting sand cooling device according to claim 1, characterized in that: The first liquid cooling component and the second liquid cooling component have the same structure.

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