Six-in-one evaporative pattern casting sand cooling device

Abstract

The utility model relates to a six-in-one evanescent mode casting sand cooling device, which belongs to the technical field of evanescent mode casting, and comprises an upper box body, a lower box body and a sand outlet box which are sequentially connected from top to bottom, a sand outlet mechanism is arranged below the sand outlet box, the upper parts and the lower parts of the upper box body and the lower box body are respectively connected through a first connecting pipe, and a second connecting pipe is arranged between the upper box body and the lower box body. The upper box body and the lower box body are connected through a second connecting pipe, a plurality of cooling pipes are transversely arranged in the upper box body and the lower box body respectively, the two ends of each cooling pipe are connected with the first connecting pipe and the second connecting pipe respectively, and a temperature sensor is arranged on the sand outlet box and electrically connected with the sand outlet mechanism. Due to the design of the cooling pipe, a cooling medium can be uniformly distributed in the foundry sand, and the cooling efficiency is greatly improved. Compared with a traditional cooling mode, the device can quickly reduce the temperature of the foundry sand to a required range, and the cooling time is remarkably shortened.

Description

Technical Field

[0001] This utility model belongs to the field of lost foam casting technology, specifically relating to a six-in-one lost foam casting sand cooling device. Background Technology

[0002] In lost foam casting, the molding sand is typically made of alumina or quartz sand. After pouring in molten iron and turning the casting mold, the temperature remains between 400 and 600 degrees Celsius. When reusing the molding sand, to prevent the hot sand from damaging the lost foam model, the temperature must be reduced to between 40 and 50 degrees Celsius. Cooling the casting sand is a crucial step, directly affecting the quality of the castings and production efficiency. Traditional methods for cooling casting sand mainly include drum cooling systems, vertical water circulation cooling systems, and fluidized bed cooling systems. However, these methods have many shortcomings in practical applications.

[0003] For example, Chinese patent number CN216705915U discloses a new type of cooling equipment for lost foam casting, including a sand box, a water tank and a heat exchange device. The equipment cools the casting sand by circulating water. Although the water cooling efficiency is high, the device occupies a large area, has high operating costs, requires a large investment, suffers from scale accumulation, and is complex to maintain. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A six-in-one lost foam casting sand cooling device includes an upper box, a lower box, and a sand discharge box connected sequentially from top to bottom. A sand discharge mechanism is provided below the sand discharge box. The upper and lower parts of the upper and lower boxes are connected by a first connecting pipe, and the upper and lower boxes are connected by a second connecting pipe. Several cooling pipes are arranged horizontally inside the upper and lower boxes, and the two ends of the cooling pipes are connected to the first connecting pipe and the second connecting pipe, respectively. A temperature sensor is provided on the sand discharge box, and the temperature sensor is electrically connected to the sand discharge mechanism.

[0006] Furthermore, the upper and lower housings each include a flange plate, a vertical plate, an inner wall, and a partition plate on both sides. The cooling pipe is embedded in the inner wall, and the cavity formed by the inner wall and the outer wall of the cooling pipe is used for the falling casting sand. The flange plate, vertical plate, inner wall, and partition plate respectively form a first chamber, a second chamber, a third chamber, and a fourth chamber. The first and third chambers are connected to the second and fourth chambers by cooling pipes. The third and fourth chambers are connected by a first connecting pipe. The second chamber of the upper housing is connected to the first chamber of the lower housing by a second connecting pipe. The second chamber of the lower housing is used to connect to a cooling fan, and the first chamber of the upper housing is used to connect to a waste heat recovery device.

[0007] Furthermore, the sand discharge mechanism includes a drive motor, a baffle, and a guide rail. The drive motor is fixed to one side of the guide rail, the baffle is slidably connected to the guide rail, a rack is provided at the bottom of the baffle, a gear is provided on the output shaft of the drive motor, the gear meshes with the rack, and the drive motor is electrically connected to a temperature sensor.

[0008] Furthermore, the guide rails are in two sets, each with a rail groove, and the baffle is disposed within the rail groove, with the baffle slidably connected to the rail groove.

[0009] Furthermore, the drive motor includes a motor and a reducer.

[0010] Furthermore, the cooling pipe is a seamless steel pipe with an outer diameter of φ25mm or 32mm, a wall thickness of 3mm, and a quantity of 400 to 600.

[0011] Furthermore, the temperature sensor is a thermocouple sensor with a temperature measurement range of 0℃ to 1000℃ and an accuracy of ±1℃.

[0012] Furthermore, both the first and second connecting pipes are made of stainless steel, with an inner diameter of φ100mm and a wall thickness of 2mm.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model provides a six-in-one lost foam casting sand cooling device. This device consists of several cooling pipes horizontally arranged within the upper and lower housings, connected at both ends by a first connecting pipe and a second connecting pipe, forming a highly efficient cooling system. The design of the cooling pipes allows the cooling medium to be evenly distributed within the casting sand, greatly improving cooling efficiency. Compared to traditional cooling methods, this device can lower the temperature of the casting sand to the required range more quickly, significantly shortening the cooling time.

[0015] 2. This utility model provides a six-in-one lost foam casting sand cooling device. This device adopts a tower-type modular combination design, which occupies a small area, is easy to install and assemble, and has a low cost. The cooling pipe is made of seamless steel pipe, which has high corrosion resistance and wear resistance, long service life, and low maintenance cost.

[0016] 3. This utility model discloses a six-in-one lost foam casting sand cooling device. This device achieves real-time monitoring and automatic control of the casting sand temperature by installing a temperature sensor on the sand discharge box and electrically connecting it to the sand discharge mechanism. When the casting sand temperature reaches the set value, the drive motor moves the baffle plate, automatically completing the sand discharge operation, improving the level of production automation, reducing manual intervention, and lowering labor intensity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the device structure of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the device of this utility model;

[0019] Figure 3 This is a schematic diagram of the main structure of the device of this utility model;

[0020] Figure 4 This is a schematic diagram of the left side of the device of this utility model;

[0021] Figure 5 This is a bottom view of the structure of the device of this utility model;

[0022] Figure 6 This is an enlarged structural diagram of part A of the device of this utility model;

[0023] Figure 7 This is a cross-sectional view of the device BB of this utility model;

[0024] Figure 8 This is a CC cross-sectional view of the device of this utility model.

[0025] In the diagram: 1. Upper housing, 2. Lower housing, 11. Flange plate, 12. Vertical plate, 13. Inner wall, 14. Partition, 15. First chamber, 16. Second chamber, 17. Third chamber, 18. Fourth chamber, 3. Sand discharge box, 4. Sand discharge mechanism, 41. Drive motor, 42. Gear, 43. Baffle, 44. Rack, 45. Guide rail, 5. First connecting pipe, 6. Second connecting pipe, 7. Cooling pipe, 8. Temperature sensor. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0027] Example 1

[0028] like Figures 1 to 8 As shown, this utility model provides an embodiment of a six-in-one lost foam casting sand cooling device, including an upper box 1, a lower box 2, a sand discharge box 3, and a sand discharge mechanism 4.

[0029] The specific structure and connection relationships of each component are as follows:

[0030] Box structure

[0031] The upper box 1, lower box 2, and sand outlet box 3 are sequentially connected from top to bottom by flange bolts, forming a vertical casting sand flow channel. The upper box 1 and lower box 2 are connected by a first connecting pipe 5. Figure 7 As shown, both sides of the upper housing 1 and the lower housing 2 are welded and divided into four independent chambers by flange plates 11, vertical plates 12, inner walls 13, and partition plates 14: the first chamber 15 (top left), the second chamber 16 (bottom left), the third chamber 17 (top right), and the fourth chamber 18 (bottom right). The first connecting pipe 5 connects the bottom chamber (fourth chamber 18) and the upper chamber (third chamber 17) of the upper housing 1 to the bottom chamber (fourth chamber 18) and the upper chamber (third chamber 17) of the lower housing 2, respectively. The second connecting pipe 6 connects the lower chamber (second chamber 16) of the upper housing 1 to the top chamber (first chamber 15) of the lower housing 2, respectively. Multiple chambers are connected sequentially from bottom to top. Cold air flows upward in a counter-current manner, layering and cooling the falling molding sand. Finally, the hot air is led to the waste heat recovery device.

[0032] Sand falling channel: A cavity is formed between the inner wall 13 and the outer wall of the cooling pipe 7, and the casting sand flows from top to bottom under the action of gravity; the high-temperature molding sand passes through the gap between the outer pipe and the seamless steel pipe, and the high-pressure and high-flow air passes through the seamless steel pipe at high speed, carrying away the high-temperature heat and achieving the purpose of cooling.

[0033] Cooling air circulation process:

[0034] This utility model device adopts a modular tower assembly, which can be stacked and assembled in multiple groups. The number of modular matrix sand cooling device groups can be adjusted according to the actual processing capacity, ranging from 6 to 9 groups. The modular tower assembly saves space and reduces the number of transmissions. The sand falls slowly due to natural gravity, eliminating impact and reducing wear and tear on the device. Each module is equipped with an independent fan to ensure sufficient air pressure, air velocity, and flow rate. The external cooling fan can be an axial flow fan or a high-speed centrifugal fan. One high-pressure fan can achieve six working scenarios: negative pressure sand suction, cooling, positive pressure conveying, dust removal, compartmentalized conveying, and waste heat airflow blowing into the drying room for waste heat reuse. It is simpler, more efficient, more energy-saving, and more environmentally friendly. An external cooling fan is connected to the second chamber 16 of the lower housing 2, and then through the cooling pipe 7 to the fourth chamber 18 of the housing 2. It is then connected through the first connecting pipe 5 to the third chamber 17 of the lower housing 2, and then through the cooling pipe 7 to the first chamber 15 of the lower housing 2. The cold air then enters the second chamber 16 of the upper housing 1 through the second connecting pipe 6. The cold air enters the fourth chamber 18 through the cooling pipe 7, and then flows into the third chamber 17 through the first connecting pipe 5. Finally, the hot air is discharged from the first chamber 15 of the upper housing 1 and connected to a waste heat recovery device (such as an industrial heat exchanger).

[0035] Cooling pipe 7:

[0036] Multiple cooling pipes 7 are evenly distributed horizontally inside the upper housing 1 and the lower housing 2. The two ends of the cooling pipes 7 penetrate the inner walls 13 on both sides and are connected to the chambers on both sides. They are then connected to the upper and lower chambers through the first connecting pipe 5 and the second connecting pipe 6 to form a cooling air circulation path.

[0037] Structure and control of sand discharge mechanism 4

[0038] Driver components:

[0039] The drive motor 41 adopts an integrated structure of servo motor and reducer, and is fixed on one side of the guide rail 45. The output shaft is equipped with gear 42. The bottom of the baffle 43 is welded with rack 44, which meshes with gear 42. The baffle 43 is driven to slide horizontally along the guide rail 45 by the forward and reverse rotation of the motor, thereby controlling the opening and closing and the degree of opening of the sand outlet.

[0040] Guide rail design:

[0041] Two sets of parallel guide rails 45 are welded to the bottom of the sand discharge box 3. T-shaped rail grooves are opened on the guide rails 45, and the baffles 43 are embedded in the rail grooves on both sides to slide, ensuring the stability of movement.

[0042] Temperature linkage control:

[0043] Temperature sensor 8 is a K-type thermocouple, embedded in the side wall of sand box 3 and fitted with a wear-resistant sleeve. The temperature measurement range is 0~1000℃ and the accuracy is ±1℃. Temperature sensor 8 is electrically connected to drive motor 41 through PLC controller. When the sand temperature exceeds the set threshold (e.g., 80℃), drive motor 41 closes baffle 43 to stop sand discharge. After the temperature reaches the target, baffle 43 automatically opens.

[0044] Cooling pipe and connecting pipe parameters

[0045] Cooling pipe 7: Made of seamless steel pipe with an outer diameter of φ25mm or φ32mm and a wall thickness of 3mm. 400 to 600 pipes are evenly distributed in a single box, with a total heat dissipation area of ​​50 to 80㎡.

[0046] Connecting pipes: The first connecting pipe 5 and the second connecting pipe 6 are made of 304 stainless steel, with an inner diameter of φ100mm and a wall thickness of 2mm. They are resistant to high temperatures and ensure efficient airflow transmission.

[0047] This invention achieves gradient cooling and heat recovery of sand through multi-chamber linkage design, dense cooling pipe layout and temperature feedback control. The cooling efficiency is improved by more than 30% compared with traditional equipment. At the same time, it avoids the problem of sand particles being too cold or too hot. It is suitable for continuous automated processing of lost foam casting sand.

[0048] The working process of this utility model's molding sand cooling system is as follows: After pouring molten iron and cooling for several hours, a box-turning operation is performed to tilt the sand box into the sand drop hopper. At the same time, the casting is lifted off the sand drop hopper, and the molding sand that needs to be cooled naturally flows into the sand drop hopper. Then, it is fed into a vibrating screen by a vibrating feeder. After impurities are removed, it falls into the suction port of a high-pressure blower, which sucks the sand into the sand distributor at the top of the sand cooling device. The sand distributor evenly distributes the sand, which flows naturally into the sand cooling device. The temperature of the sand is conducted to the cooling pipe wall and then carried away by the high-pressure, high-velocity, and high-flow-rate cooling air. When the sand temperature drops to the preset temperature, the sand discharge valve automatically opens to discharge sand. The sand that has passed the cooling temperature test naturally falls into the positive pressure blowing port of the high-pressure blower and is sent to the sand storage bin by high-pressure air for later use. The entire cooling process is then completed.

[0049] Of course, the above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A six-in-one lost foam casting sand cooling device, characterized in that: The system includes an upper box (1), a lower box (2), and a sand discharge box (3) connected from top to bottom. A sand discharge mechanism (4) is provided below the sand discharge box (3). The upper and lower parts of the upper box (1) and the lower box (2) are connected by a first connecting pipe (5) and the upper box (1) and the lower box (2) are connected by a second connecting pipe (6). Several cooling pipes (7) are arranged horizontally inside the upper box (1) and the lower box (2). The two ends of the cooling pipes (7) are connected to the first connecting pipe (5) and the second connecting pipe (6) respectively. A temperature sensor (8) is provided on the sand discharge box (3) and the temperature sensor (8) is electrically connected to the sand discharge mechanism (4).

2. The six-in-one lost foam casting sand cooling device according to claim 1, characterized in that: The upper housing (1) and lower housing (2) each include a flange plate (11), a vertical plate (12), an inner wall (13), and a partition plate (14) on both sides. The cooling pipe (7) is embedded in the inner wall (13), and the cavity formed by the inner wall (13) and the outer wall of the cooling pipe (7) is used for the drop of casting sand. The flange plate (11), vertical plate (12), inner wall (13), and partition plate (14) respectively form a first chamber (15), a second chamber (16), a third chamber (17), and a fourth chamber (18). The first chamber (15) and the second chamber (18) form a first chamber (15), a second chamber (16), a third chamber (17), and a fourth chamber (18). The three chambers (17) are connected to the second chamber (16) and the fourth chamber (18) respectively by cooling pipes (7). The third chamber (17) and the fourth chamber (18) are connected by the first connecting pipe (5). The second chamber (16) of the upper box (1) and the first chamber (15) of the lower box (2) are connected by the second connecting pipe (6). The second chamber (16) of the lower box (2) is used to connect the cooling fan, and the first chamber (15) of the upper box (1) is used to connect the waste heat recovery device.

3. The six-in-one lost foam casting sand cooling device according to claim 1, characterized in that: The sand discharge mechanism (4) includes a drive motor (41), a baffle (43) and a guide rail (45). The drive motor (41) is fixed on one side of the guide rail (45). The baffle (43) is slidably connected to the guide rail (45). A rack (44) is provided at the bottom of the baffle (43). A gear (42) is provided on the output shaft of the drive motor (41). The gear (42) is meshed with the rack (44). The drive motor (41) is electrically connected to the temperature sensor (8).

4. The six-in-one lost foam casting sand cooling device according to claim 3, characterized in that: The guide rail (45) consists of two sets, and the guide rail (45) is provided with a rail groove. The baffle (43) is provided in the rail groove and is slidably connected to the rail groove.

5. A six-in-one lost foam casting sand cooling device according to claim 3, characterized in that: The drive motor (41) includes a motor and a reducer.

6. The six-in-one lost foam casting sand cooling device according to claim 1, characterized in that: The cooling pipe (7) is a seamless steel pipe with an outer diameter of φ25mm or 32mm. The wall thickness of the cooling pipe (7) is 3mm. The number of cooling pipes (7) is 400 to 600.

7. The six-in-one lost foam casting sand cooling device according to claim 1, characterized in that: The temperature sensor (8) is a thermocouple sensor with a temperature measurement range of 0℃~1000℃ and an accuracy of ±1℃.

8. The six-in-one lost foam casting sand cooling device according to claim 1, characterized in that: The first connecting pipe (5) and the second connecting pipe (6) are both made of stainless steel, with an inner diameter of φ100mm and a wall thickness of 2mm.

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