A surface drying device for dip-coated sand cores

Abstract

This invention relates to the field of core-making equipment technology and provides a surface drying device for impregnated sand cores, including a frame; a conveying mechanism, a heating mechanism, a waste heat recovery mechanism, and a gas circulation mechanism mounted on the frame; the conveying mechanism is used to convey sand cores to be surface dried; the heating mechanism is used to generate hot air; the gas circulation mechanism is used to guide the hot air to the sand cores and recover the gas generated during drying; the waste heat recovery mechanism is used to recover waste heat from the gas and feed it back to the heating mechanism. The surface drying device for impregnated sand cores provided by this solution significantly reduces energy consumption while improving the uniformity and quality of sand core surface drying, thus solving the problem of high energy consumption in current core-making processes.

Description

Technical Field

[0001] This invention belongs to the field of core-making equipment technology, and particularly relates to a surface drying device for impregnated sand cores. Background Technology

[0002] In high-precision core-making processes, after sand cores (impregnated sand cores) are formed by sand injection and impregnated, the coating on the surface of the impregnated sand cores needs to be dried quickly and evenly to ensure the dimensional stability, surface quality, and subsequent core assembly accuracy of the sand cores.

[0003] However, most of the mainstream surface drying devices that are used with existing core-making equipment adopt the hot air direct blowing drying method. Not only is the hot air directly discharged after the drying operation is completed, but the large amount of residual heat contained therein is not effectively recovered and reused, resulting in high energy consumption; moreover, the hot air distribution is prone to unevenness, affecting the uniformity of sand core surface drying. Summary of the Invention

[0004] This invention provides a surface drying device for impregnated sand cores, aiming to solve the problem of high energy consumption in current core making as mentioned in the background art.

[0005] The present invention is implemented as follows: a surface drying device for impregnated sand cores includes: a frame; a conveying mechanism, a heating mechanism, a waste heat recovery mechanism, and a gas circulation mechanism disposed on the frame; the conveying mechanism is used to convey the sand core to be surface dried; the heating mechanism is used to generate hot air; the gas circulation mechanism is used to guide the hot air to the sand core and recover the gas generated during drying; the waste heat recovery mechanism is used to recover the waste heat in the gas and feed it back to the heating mechanism.

[0006] Preferably, the conveying mechanism includes: a platform fixed on the frame; a plurality of rollers rotatably mounted on the platform via bearing seats; a conveyor belt sleeved on the rollers, the conveyor belt being used to carry and convey the sand cores to be surface dried; and a drive assembly for driving the rollers to rotate.

[0007] Preferably, the drive assembly includes: a mounting box fixed inside the frame, wherein a motor and a speed regulator are fixed inside the mounting box, and the output shaft of the motor is fixedly connected to the input shaft of the speed regulator via a coupling; a first transmission rod rotatably mounted inside the mounting box via a bearing seat, one end of the first transmission rod being fixedly connected to the output shaft of the speed regulator via a coupling; and pulleys respectively fixed on the first transmission rod and the corresponding roller, wherein a transmission belt is fitted on the pulley for driving the roller to rotate.

[0008] Preferably, the heating mechanism includes: a heating box disposed in the frame, wherein a plurality of electric heating tubes are disposed in the heating box; an outer shell fixed on the platform, wherein an interconnected air pipe is fixed to the inner wall of the outer shell by a bracket, and an air diffuser is fixedly connected to the air pipe; the heating box is connected to the air pipe through a first air guide pipe for guiding the heated air to the sand core.

[0009] Preferably, the gas circulation mechanism includes: a through groove formed on the platform; a collection shell fixed to the bottom of the platform; a collection box disposed in the frame, the collection box being connected to the collection shell through a conduit; a filter bag and a filter plate disposed inside the collection box; and the collection box being connected to the waste heat recovery mechanism through a second air duct for recovering dust-laden gas generated during drying and filtering impurities.

[0010] Preferably, the air circulation mechanism further includes: a first rotating shaft rotatably mounted in the collection box via a sealed bearing; a fan blade fixed on the first rotating shaft; a second transmission rod rotatably mounted in the mounting box via a bearing; first bevel teeth respectively fixed on the second transmission rod and the first transmission rod and meshing with each other; and second bevel teeth respectively fixed on the second transmission rod and the first rotating shaft and meshing with each other, for driving the first rotating shaft to rotate.

[0011] Preferably, the waste heat recovery mechanism includes: a recovery box disposed within the frame for holding heat transfer oil; a bent pipe disposed within the recovery box, the air inlet of the bent pipe being connected to the collection box via a second air guide pipe, and the air outlet of the bent pipe being connected to the heating box via a third air guide pipe; and several fins fixed on the bent pipe.

[0012] Preferably, the waste heat recovery mechanism further includes: a liquid cavity opened inside the outer shell, wherein a plurality of partition plates are fixed inside the liquid cavity to separate liquid channels for the flow of heat transfer oil; and an electric heating block disposed inside the recovery tank, wherein the recovery tank is connected to the liquid cavity through a liquid guiding assembly to transport the heated heat transfer oil to the liquid cavity to achieve heat preservation of the outer shell.

[0013] Preferably, the liquid guiding assembly includes: a liquid guiding shell disposed within the frame, the liquid outlet of the liquid guiding shell being connected to the liquid chamber via a liquid guiding pipe; a second rotating shaft rotatably mounted within the liquid guiding shell via a sealed bearing; an impeller fixedly mounted on the second rotating shaft; a liquid extraction pipe fixedly connected to the liquid guiding shell, the liquid inlet of the liquid extraction pipe being fixedly connected to the recovery tank; third bevel teeth respectively fixedly mounted on the second transmission rod and the second rotating shaft and meshing with each other; and a return pipe fixedly connected to one side of the liquid chamber, the liquid outlet of the return pipe being fixedly connected to the recovery tank.

[0014] Preferably, a temperature controller is provided on the outer wall of the heating box, which is used to control the working temperature of the heating tube and the heating block. A temperature detector is provided on the outer wall of the outer shell, with its detection probe located inside the outer shell, for detecting the temperature inside the outer shell.

[0015] Compared with related technologies, the surface drying device for impregnated sand cores provided by this invention has the following beneficial effects: It integrates a conveying mechanism, a heating mechanism, a waste heat recovery mechanism, and a gas circulation mechanism through a frame, and uses a motor and speed controller to drive the conveyor belt to achieve stable sand core conveying. Hot air is generated by a heating box and electric heating tubes and evenly applied to the sand core through air pipes and an air diffuser. The dust-laden gas generated during drying is filtered through a collection box, filter bags, and filter plates. Waste heat from the gas is then recovered through a bend pipe, fins, and a recovery box. The outer shell is insulated with a liquid chamber and liquid guiding components. Simultaneously, the temperature is precisely controlled by a temperature controller and a temperature detector. A cleaning mechanism ensures the cleanliness of the conveyor belt. This device has a compact structure, a high degree of automation, and is adaptable to different sand core surface drying requirements. While improving the uniformity and quality of sand core surface drying, it significantly reduces energy consumption and dust pollution, providing an efficient and environmentally friendly surface drying solution for core production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a surface drying device for impregnated sand cores provided by the present invention; Figure 2 This is a schematic diagram of the main cross-sectional structure of a surface drying device for impregnated sand cores provided by the present invention; Figure 3 for Figure 2 An enlarged structural diagram of part A shown in the figure; Figure 4 for Figure 2 An enlarged structural diagram of part B shown in the figure; Figure 5 for Figure 2 An enlarged structural diagram of section C shown in the figure; Figure 6 for Figure 2 An enlarged structural diagram of part D shown in the figure; Figure 7 This is a schematic diagram of the structure of the frame, platform, outer shell and mounting box in this invention; Figure 8 This is a schematic diagram of the structure of the collecting shell in this invention; Figure 9 This is a schematic diagram of the structure of the platform and the through groove in this invention; Figure 10 This is a schematic diagram of the conveyor belt structure in this invention.

[0017] Reference numerals: 1. Frame; 2. Platform; 3. Outer shell; 4. Roller; 5. Conveyor belt; 6. Air pipe; 7. Expansion hood; 8. Heating box; 9. Electric heating element; 10. First air guide duct; 11. Through groove; 12. Collection shell; 13. Collection box; 14. Guide tube; 15. Filter bag; 16. Filter plate; 17. Mounting box; 18. Motor; 19. Speed ​​regulator; 20. First transmission rod; 21. Pulley; 22. Transmission belt; 23. First rotating shaft; 24. Fan blade; 25. Second transmission rod; 26. First bevel gear; 27. Second bevel gear; 28. Second air guide duct; 29. 30. Recycling bin; 31. Bend; 32. Fin; 33. Third air duct; 34. Plug; 35. Drain pipe; 36. Valve; 37. Mounting base; 38. Brush roller; 39. First gear; 40. Second gear; 41. Mounting bracket; 42. Electric telescopic rod; 43. Connecting plate; 44. Connecting rod; 45. Temperature controller; 46. Inlet; 47. Liquid chamber; 48. Divider plate; 49. Liquid guide shell; 50. Second rotating shaft; 51. Impeller; 52. Liquid extraction pipe; 53. Liquid guide pipe; 54. Third bevel gear; 55. Return pipe; 56. Heating block; 57. Temperature detector. Detailed Implementation

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] This invention provides a surface drying device for impregnated sand cores, such as... Figure 1-10 As shown, it includes: a frame 1; a conveying mechanism, a heating mechanism, a waste heat recovery mechanism, and an air circulation mechanism disposed on the frame 1; the conveying mechanism is used to convey the sand core to be surface dried; the heating mechanism is used to generate hot air; the air circulation mechanism is used to guide the hot air to the sand core and recover the gas generated during drying; the waste heat recovery mechanism is used to recover the waste heat in the gas and feed it back to the heating mechanism.

[0020] In this embodiment, during use, the working temperature of the heating element 9 and the heating block 55 is first set by the temperature controller 44 and started. At the same time, the motor 18 is started. The motor 18 drives the first transmission rod 20 to rotate via the speed regulator 19. The first transmission rod 20 drives the roller 4 to rotate via the pulley 21 and the transmission belt 22, so that the conveyor belt 5 runs accordingly. Simultaneously, the second transmission rod 25 and the first rotating shaft 23 are driven to rotate. The fan blades 24 rotate to create negative pressure in the collection box 13, creating conditions for air circulation and waste heat recovery. After the temperature detector 56 shows that the temperature inside the outer shell 3 has reached the surface drying requirement, the sand core to be surface dried is placed on the conveyor belt 5. The conveyor belt 5 transports the sand core into the outer shell 3. The hot air generated by the heating mechanism is blown onto the sand core through the first air guide pipe 10, the air pipe 6 and the air diffuser 7 for surface drying treatment. The gas and dust generated during the drying process enter the collection box 13 through the through groove 11, the collection shell 12 and the conduit 14. The dust is intercepted and filtered by the filter bag 15 and the filter plate 16. The filtered hot gas enters the waste heat recovery mechanism through the second air duct 28. The waste heat is transferred to the heat transfer oil in the recovery box 29 through the bend 30 and fins 31. The hot gas then flows back to the heating box 8 through the third air duct 32 for reheating. The heat transfer oil is circulated to the liquid cavity 46 of the outer shell 3 through the liquid guiding component to achieve heat preservation, reduce the energy consumption of the electric heating tube 9 and the electric heating block 55, and improve the energy utilization rate.

[0021] In a further preferred embodiment of the present invention, the conveying mechanism includes: a platform 2 fixed on a frame 1; a plurality of rollers 4 rotatably mounted on the platform 2 via bearing seats; a conveyor belt 5 sleeved on the rollers 4, the conveyor belt 5 being used to carry and convey the sand cores to be surface dried; and a drive assembly for driving the rollers 4 to rotate.

[0022] In this embodiment, when in use, the motor 18 in the drive assembly is started, the output shaft of the motor 18 drives the speed regulator 19 to run, and the speed regulator 19 drives the first transmission rod 20 to rotate through the output shaft. The first transmission rod 20 drives several rollers 4 on the platform 2 to rotate synchronously by means of the cooperation of the pulley 21 and the transmission belt 22. The rotation of roller 4 causes the conveyor belt 5 mounted on it to run smoothly. At this time, the sand core to be surface dried is placed on the conveyor belt 5. The conveyor belt 5 can continuously carry the sand core and transport it into the outer shell 3, providing a basis for the continuous surface drying operation of the sand core. The conveying mechanism, through the cooperation of motor 18 and speed regulator 19, can adjust the running speed of roller 4 and conveyor belt 5 to adapt to the surface drying requirements of different sand cores. At the same time, the setting of several rollers 4 can ensure the smooth operation of conveyor belt 5, reduce the positional deviation of sand cores during the conveying process, and help improve the uniformity of surface drying of sand cores.

[0023] In a further preferred embodiment of the present invention, the drive assembly includes: a mounting box 17 fixed inside the frame 1, wherein a motor 18 and a speed regulator 19 are fixed inside the mounting box 17, and the output shaft of the motor 18 is fixedly connected to the input shaft of the speed regulator 19 via a coupling; a first transmission rod 20 rotatably mounted inside the mounting box 17 via a bearing seat, one end of the first transmission rod 20 being fixedly connected to the output shaft of the speed regulator 19 via a coupling; and pulleys 21 respectively fixed on the first transmission rod 20 and the corresponding roller 4, wherein a transmission belt 22 is sleeved on the pulley 21 for driving the roller 4 to rotate.

[0024] In this embodiment, when in use, the motor 18 inside the mounting box 17 is started. The output shaft of the motor 18 drives the speed regulator 19 to run through the coupling. After the speed regulator 19 adjusts the output speed according to the surface drying requirements of the sand core, it drives the first transmission rod 20 to rotate through the coupling. When the first transmission rod 20 rotates, the pulley 21 at its end rotates synchronously. Power is transmitted through the transmission belt 22 sleeved on the pulley 21, which drives the pulley 21 on the corresponding roller 4 to rotate, thereby causing the roller 4 to rotate to drive the conveyor belt 5 to run. Mounting box 17 provides a stable installation environment for motor 18, speed regulator 19 and first transmission rod 20, reducing the impact of vibration during operation. The cooperation between motor 18 and speed regulator 19 can flexibly adjust the transmission speed to adapt to the conveying rhythm of different sand cores. The transmission method of pulley 21 and transmission belt 22 is easy to install and maintain, which helps to ensure the stability and reliability of the conveying mechanism.

[0025] In a further preferred embodiment of the present invention, the heating mechanism includes: a heating box 8 disposed in the frame 1, wherein a plurality of electric heating tubes 9 are disposed in the heating box 8; a shell 3 fixed on the platform 2, wherein an interconnected air pipe 6 is fixed to the inner wall of the shell 3 by a bracket, and an air diffuser 7 is fixedly connected to the air pipe 6; the heating box 8 is connected to the air pipe 6 through a first air guide pipe 10 for guiding the heated hot air to the sand core.

[0026] In this embodiment, during use, the working temperature of the electric heating tube 9 in the heating box 8 is set and started by the temperature controller 44. The electric heating tube 9 heats the gas entering the heating box 8 to form hot air that meets the surface drying requirements of the sand core. The heated air is delivered to the air pipe 6 on the inner wall of the outer shell 3 through the first air guide pipe 10. The air pipe 6 is fixed by the bracket and interconnected, so that the hot air can be evenly distributed. Then, it is blown out to the sand core inside the outer shell 3 through the air diffuser 7 fixed and connected on the air pipe 6. The installation of several electric heating tubes 9 can improve heating efficiency and facilitate the rapid formation of the required hot air. The interconnected air pipes 6 and the air diffuser 7 work together to allow the hot air to act more evenly on the surface of the sand core, helping the coating on the surface of the sand core to dry evenly. At the same time, the outer shell 3 can provide a relatively closed environment for the drying process, reduce heat loss, and help reduce energy consumption.

[0027] In a further preferred embodiment of the present invention, the gas circulation mechanism includes: a through groove 11 formed on the platform 2; a collection shell 12 fixed to the bottom of the platform 2; a collection box 13 disposed in the frame 1, the collection box 13 being connected to the collection shell 12 through a conduit 14; a filter bag 15 and a filter plate 16 being disposed inside the collection box 13; and the collection box 13 being connected to a waste heat recovery mechanism through a second air duct 28 for recovering dust-laden gas generated during drying and filtering impurities.

[0028] In this embodiment, when the sand core is surface dried inside the outer shell 3, the generated dust-laden gas and debris will move downward with the airflow and fall into the collection shell 12 fixed at the bottom of the platform 2 through the through groove 11 on the platform 2. The collection shell 12 plays a preliminary role in collecting the dust-laden gas and debris. The collected dust-laden gas and debris enter the collection box 13 inside the frame 1 through the duct 14. The larger debris particles are first intercepted by the filter bag 15 inside the collection box 13, and then the fine impurities in the gas are filtered through the filter plate 16 to achieve graded filtration of the dust-laden gas. The filtered gas is transported to the waste heat recovery mechanism through the second air duct 28 for waste heat utilization. The cooperation between the filter bag 15 and the filter plate 16 can reduce the impurity content in the gas and avoid blockage of subsequent pipelines and components. The corresponding arrangement of the collection shell 12 and the through groove 11 can improve the collection efficiency of dust-laden gas and provide a guarantee for the smooth operation of gas circulation and waste heat recovery.

[0029] In a further preferred embodiment of the present invention, the air circulation mechanism further includes: a first rotating shaft 23 rotatably mounted in the collection box 13 via a sealed bearing; a fan blade 24 fixed on the first rotating shaft 23; a second transmission rod 25 rotatably mounted in the mounting box 17 via a bearing; a first bevel tooth 26 fixed on the second transmission rod 25 and the first transmission rod 20 respectively and meshing with each other; and a second bevel tooth 27 fixed on the second transmission rod 25 and the first rotating shaft 23 respectively and meshing with each other, for driving the first rotating shaft 23 to rotate.

[0030] In this embodiment, after the motor 18 is started, the first transmission rod 20 rotates accordingly, and the first bevel tooth 26 fixed on it meshes with the first bevel tooth 26 on the second transmission rod 25, thereby driving the second transmission rod 25 to rotate inside the mounting box 17. When the second transmission rod 25 rotates, the second bevel tooth 27 at its end meshes with the second bevel tooth 27 on the first rotating shaft 23, driving the first rotating shaft 23 to rotate in the collection box 13 through the sealed bearing, thereby driving the fan blade 24 fixed on the first rotating shaft 23 to rotate synchronously. The rotation of fan blade 24 creates negative pressure inside collection box 13, providing power for the collection and transportation of dust-laden gas and facilitating efficient gas circulation.

[0031] In a further preferred embodiment of the present invention, the waste heat recovery mechanism includes: a recovery box 29 disposed in the frame 1 for holding heat transfer oil; a bent pipe 30 disposed in the recovery box 29, the air inlet of the bent pipe 30 being connected to the collection box 13 through a second air guide pipe 28, and the air outlet of the bent pipe 30 being connected to the heating box 8 through a third air guide pipe 32; and a plurality of fins 31 fixed on the bent pipe 30.

[0032] In this embodiment, the filtered hot gas delivered by the gas circulation mechanism enters the bend 30 inside the recovery box 29 through the second air duct 28. At this time, the heat transfer oil contained in the recovery box 29 comes into contact with the outer wall of the bend 30 and initially absorbs the heat transferred by the hot gas. The fins 31 fixed on the bend 30 increase the contact area with the heat transfer oil, so that the heat in the hot gas is more fully transferred to the heat transfer oil, achieving efficient absorption of waste heat. The hot gas after absorbing heat continues to flow along the bend 30. The gas carrying residual heat flows back to the heating box 8 through the third air duct 32 for reheating, reducing the heating load of the electric heating tube 9 in the heating box 8. The heat transfer oil absorbs the residual heat and its temperature rises, which can be used for subsequent heat preservation or auxiliary heating to improve energy utilization. The structural design of the bend 30 extends the gas flow path and further improves the waste heat recovery effect.

[0033] In a further preferred embodiment of the present invention, the waste heat recovery mechanism further includes: a liquid cavity 46 opened in the outer shell 3, wherein a plurality of partition plates 47 are fixed in the liquid cavity 46 to separate liquid channels for the flow of heat transfer oil; and an electric heating block 55 disposed in the recovery tank 29, wherein the recovery tank 29 is connected to the liquid cavity 46 through a liquid guiding assembly to transport the heated heat transfer oil to the liquid cavity 46 to achieve heat preservation of the outer shell 3.

[0034] In this embodiment, during use, the heating block 55 in the recovery box 29 can assist in heating the heat transfer oil. After the temperature of the heat transfer oil reaches the preset requirement, the heat transfer oil is transported from the recovery box 29 to the liquid cavity 46 in the outer shell 3 through the liquid guiding component. Several partition plates 47 in the liquid cavity 46 divide the liquid channels into orderly channels, so that the heat transfer oil can flow evenly along the channels and fully contact the inner wall of the outer shell 3, creating a stable temperature environment inside the outer shell 3. The circulation of heat transfer oil can effectively reduce heat loss inside the outer shell 3, helping the coating on the sand core surface to dry evenly. At the same time, the electric heating block 55 only starts when the heat transfer oil temperature is insufficient, and with the help of waste heat recovery, energy consumption is further reduced. The liquid channel formed by the partition plate 47 extends the flow path of the heat transfer oil, further improving the uniformity and stability of the sand core surface drying.

[0035] In a further preferred embodiment of the present invention, the liquid guiding assembly includes: a liquid guiding shell 48 disposed within the frame 1, the liquid outlet of the liquid guiding shell 48 being connected to the liquid chamber 46 via a liquid guiding pipe 52; a second rotating shaft 49 rotatably mounted within the liquid guiding shell 48 via a sealed bearing; an impeller 50 fixedly mounted on the second rotating shaft 49; a liquid extraction pipe 51 fixedly connected to the liquid guiding shell 48, the liquid inlet of the liquid extraction pipe 51 being fixedly connected to the recovery tank 29; a third bevel tooth 53 respectively fixedly mounted on the second transmission rod 25 and the second rotating shaft 49 and meshing with each other; and a return pipe 54 fixedly connected to one side of the liquid chamber 46, the liquid outlet of the return pipe 54 being fixedly connected to the recovery tank 29. In this embodiment, when the second transmission rod 25 rotates, the third bevel tooth 53 fixed on it meshes with the third bevel tooth 53 on the second rotating shaft 49, driving the second rotating shaft 49 to rotate in the liquid guide shell 48 through the sealed bearing, thereby driving the impeller 50 fixed on the second rotating shaft 49 to rotate synchronously. The impeller 50 rotates to generate suction, which draws the heat transfer oil in the recovery tank 29 into the liquid guide shell 48 through the liquid extraction pipe 51. Then, it is transported to the liquid chamber 46 through the liquid outlet of the liquid guide shell 48 and the liquid guide pipe 52. After the heat transfer oil in the liquid chamber 46 completes the heat exchange, it flows back to the recovery tank 29 through the return pipe 54, forming a heat transfer oil circulation.

[0036] In a further preferred embodiment of the present invention, a temperature controller 44 is provided on the outer wall of the heating box 8. The temperature controller 44 is used to control the working temperature of the heating tube 9 and the heating block 55. A temperature detector 56 is provided on the outer wall of the outer shell 3. Its detection probe is located inside the outer shell 3 and is used to detect the temperature inside the outer shell 3.

[0037] In this embodiment, before use, the target working temperature of the heating tube 9 and the heating block 55 is set by the temperature controller 44 on the outer wall of the heating box 8. After the setting is completed, the heating tube 9 and the heating block 55 are started to start the heating operation. The temperature detector 56 on the outer wall of the outer shell 3 continuously detects the actual temperature inside the outer shell 3 through its detection probe located inside the outer shell 3, and feeds the temperature data back to the temperature controller 44 in real time. The temperature controller 44 automatically adjusts the working status of the heating element 9 and the heating block 55 based on the feedback temperature data. When the temperature inside the outer shell 3 reaches the set value, it can reduce the power of the heating element 9 and the heating block 55 or stop working. When the temperature is lower than the set value, it can start or increase the power to maintain the temperature inside the outer shell 3 within a suitable range for surface drying, which is beneficial to improving the surface drying quality of the sand core and reducing unnecessary energy consumption.

[0038] To further improve the performance of this device, in addition to the above-mentioned solutions, this solution also includes the following embodiments: In another embodiment of the present invention, a cleaning mechanism is provided on the through groove 11 and the platform 2 for cleaning the conveyor belt 5. The cleaning mechanism includes an adjustable mounting base 36 disposed in the through groove 11. A brush roller 37 is rotatably mounted on the mounting base 36 via a bearing. The brush roller 37 is used to sweep away debris and dust adhering to the surface of the conveyor belt 5. A mounting frame 40 is symmetrically fixed at the bottom of the platform 2. An electric telescopic rod 41 is fixed on the mounting frame 40. A connecting plate 42 is fixed on the push rod of the electric telescopic rod 41. A connecting rod 43 is fixed on the connecting plate 42. The top end of the connecting rod 43 passes through a through hole opened on the platform 2 and is fixedly connected to the mounting base 36. A first gear 38 is fixed on the brush roller 37. A second gear 39 is fixed on the roller 4. The first gear 38 can mesh with the second gear 39 to drive the brush roller 37 to rotate through the rotation of the roller 4 to achieve cleaning.

[0039] In this embodiment, when it is necessary to clean the conveyor belt 5, the electric telescopic rod 41 on the mounting frame 40 at the bottom of the platform 2 is activated. The push rod of the electric telescopic rod 41 extends and drives the connecting plate 42 to rise. The connecting plate 42 drives the mounting seat 36 in the through groove 11 to rise synchronously through the connecting rod 43, thereby realizing the height adjustment of the brush roller 37. During the upward movement of the brush roller 37, the height of the first gear 38 at its end changes accordingly. When the first gear 38 precisely meshes with the second gear 39 on the roller 4, the electric telescopic rod 41 stops running. At this time, the rotation of the roller 4 will drive the brush roller 37 to rotate on the mounting base 36 through the gear meshing relationship, and clean the debris and dust on the surface of the conveyor belt 5. The electric telescopic rod 41 can flexibly control the lifting and contact state of the brush roller 37. The gear meshing transmission can ensure that the brush roller 37 and the conveyor belt 5 are matched in running rhythm, improve the cleaning effect, reduce the residue of debris and dust on the surface of the conveyor belt 5, avoid affecting the bearing capacity and surface drying quality of the subsequent sand core, and further optimize the stability of the device.

[0040] In another embodiment of the present invention, the recovery tank 29 is provided with a liquid replenishment port, and a removable plug 33 is provided inside the liquid replenishment port. The bottom of the recovery tank 29 is fixedly connected to a drain pipe 34, and a valve 35 is provided on the drain pipe 34 for replenishing or replacing heat transfer oil. The outer shell 3 is provided with a passage 45 for the sand core to enter and exit.

[0041] In this embodiment, when the amount of heat transfer oil in the recovery tank 29 is insufficient, the removable plug 33 in the replenishment port is removed, and an appropriate amount of heat transfer oil is added to the recovery tank 29 through the replenishment port. After replenishment, the plug 33 is reinstalled to the replenishment port to achieve convenient replenishment of heat transfer oil. When it is necessary to replace the heat transfer oil in the recovery tank 29, open the valve 35 on the drain pipe 34. The old heat transfer oil in the recovery tank 29 will be discharged through the drain pipe 34. After the old oil is discharged, close the valve 35 and then inject new heat transfer oil through the replenishment port to complete the heat transfer oil replacement. The combination of the plug 33 and the replenishment port ensures the sealing of the recovery tank 29, preventing heat transfer oil leakage or impurities from entering. The drain pipe 34 and valve 35 facilitate the discharge of old heat transfer oil. The port 45 on the outer shell 3 provides a channel for the sand core to enter and exit. The overall structure design is simple and practical, which is conducive to ensuring the stable operation of the device and the convenience of maintenance.

[0042] The frame 1 integrates the conveying mechanism, heating mechanism, waste heat recovery mechanism, and air circulation mechanism, and works with the motor 18 and speed regulator 19 to drive the conveyor belt 5 to achieve stable conveying of sand cores. The heating box 8 and electric heating tube 9 generate hot air, which is evenly applied to the sand core through the air pipe 6 and the air diffuser 7. The dust-laden gas generated during drying is filtered by the collection box 13, filter bag 15, and filter plate 16, and the waste heat of the gas is recovered by the bend pipe 30, fins 31, and recovery box 29. The outer shell 3 is kept warm by the liquid chamber 46 and the liquid guiding component. At the same time, the temperature is precisely controlled by the temperature controller 44 and the temperature detector 56. The cleaning mechanism ensures that the conveyor belt 5 is clean. This device has a compact structure, a high degree of automation, and is suitable for different sand core surface drying requirements. While improving the uniformity and quality of sand core surface drying, it significantly reduces energy consumption and dust pollution, providing an efficient and environmentally friendly surface drying solution for core production.

Claims

1. A surface drying device for impregnated sand cores, characterized in that, include: frame; The conveying mechanism, heating mechanism, waste heat recovery mechanism, and air circulation mechanism are installed on the frame; The conveying mechanism is used to convey the surface-drying sand cores; The heating mechanism is used to generate hot air; The air circulation mechanism is used to guide hot air to the sand core and recover the gas generated during drying. The waste heat recovery mechanism is used to recover waste heat from the gas and feed it back to the heating mechanism.

2. The surface drying device for impregnated sand cores as described in claim 1, characterized in that, The conveying mechanism includes: A platform fixed to the frame; Several rollers are rotatably mounted on the platform via bearing housings; A conveyor belt fitted on the roller is used to carry and transport the sand core to be surface dried. A drive assembly used to drive the rotation of the rollers.

3. The surface drying device for impregnated sand cores as described in claim 2, characterized in that, The driving component includes: A mounting box fixed inside the frame, wherein a motor and a speed controller are fixedly installed inside the mounting box, and the output shaft of the motor is fixedly connected to the input shaft of the speed controller via a coupling; The first transmission rod is rotatably mounted in the mounting box via a bearing housing, and one end of the first transmission rod is fixedly connected to the output shaft of the speed regulator via a coupling. A pulley is fixed to the first transmission rod and the corresponding roller respectively. A transmission belt is fitted on the pulley to drive the roller to rotate.

4. The surface drying device for impregnated sand cores as described in claim 3, characterized in that, The heating mechanism includes: A heating box is installed inside the frame, and the heating box is equipped with several electric heating tubes; An outer shell fixed to a platform, the inner wall of which is fixed with interconnected air pipes via a bracket, and an air diffuser is fixedly connected to the air pipes; The heating box is connected to the air pipe through the first air duct, which is used to guide the heated hot air to the sand core.

5. The surface drying device for impregnated sand cores as described in claim 4, characterized in that, The air circulation mechanism includes: A through slot formed in the platform; A collection shell fixed to the bottom of the platform; A collection box is installed inside the frame, and the collection box is connected to the collection shell through a conduit; The collection box is equipped with filter bags and filter plates; The collection box is connected to the waste heat recovery mechanism through the second air duct, and is used to recover the dust-containing gas generated during drying and filter impurities.

6. The surface drying device for impregnated sand cores as described in claim 5, characterized in that, The air circulation mechanism also includes: The first rotating shaft, installed inside the collection box, is rotated via a sealed bearing. Fan blades fixed on the first rotating shaft; The second transmission rod is rotatably mounted inside the mounting box via a bearing. First bevel teeth, respectively fixed to the second transmission rod and the first transmission rod and meshing with each other; The second bevel teeth, which are fixed to the second transmission rod and the first rotating shaft respectively and mesh with each other, are used to drive the first rotating shaft to rotate.

7. The surface drying device for impregnated sand cores as described in claim 6, characterized in that, The waste heat recovery mechanism includes: The recovery tank, located inside the frame, is used to hold the heat transfer oil; The curved pipe installed inside the recycling bin has its air inlet end connected to the collection bin via a second air guide pipe, and its air outlet end connected to the heating bin via a third air guide pipe. Several fins fixed to the bend.

8. The surface drying device for impregnated sand cores as described in claim 7, characterized in that, The waste heat recovery mechanism also includes: A liquid cavity is formed inside the outer shell, and several partition plates are fixed inside the liquid cavity to separate the liquid channels for the flow of heat transfer oil; The heating block is installed inside the recovery box, which is connected to the liquid chamber via a liquid guiding assembly. This assembly is used to transport the heated heat transfer oil to the liquid chamber to achieve heat preservation of the outer shell.

9. The surface drying device for impregnated sand cores as described in claim 8, characterized in that, The fluid guiding component includes: A liquid guiding shell is installed inside the frame, and the liquid outlet of the liquid guiding shell is connected to the liquid chamber through a liquid guiding pipe; The second rotating shaft, mounted inside the liquid guide housing, rotates via a sealed bearing. An impeller fixed on a second rotating shaft; A liquid extraction pipe is fixedly connected to the liquid guiding shell, and the inlet end of the liquid extraction pipe is fixedly connected to the recovery box; The third bevel teeth are respectively fixed on the second transmission rod and the second rotating shaft and mesh with each other; A return pipe is fixedly connected to one side of the liquid chamber, and the liquid outlet end of the return pipe is fixedly connected to the recovery tank.

10. The surface drying device for impregnated sand cores as described in claim 8, characterized in that, A temperature controller is installed on the outer wall of the heating box. The temperature controller is used to control the working temperature of the heating tube and the heating block. A temperature detector is installed on the outer wall of the outer shell. Its detection probe is located inside the outer shell and is used to detect the temperature inside the outer shell.

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