Foundry molding sand waste heat recovery device
By designing a cast molded sand waste heat recovery device and using a heat exchanger to exchange heat with cold water, the problem of the inability to utilize the cast molded sand waste heat is solved, and the effective recovery and utilization of heat is achieved.
Patent Information
- Application Number
- CN202421985108.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-08-15
AI Technical Summary
In the casting industry, the waste heat released by casting molding sand during cooling cannot be effectively utilized, resulting in waste of heat.
A cast molded sand waste heat recovery device is designed, including a heat exchange mechanism, consisting of several groups of heat exchangers, and a heat exchange chamber and sand drop pipe are provided inside. Heat exchange is carried out with the molded sand through cold water, heat is recovered and transported to the heating equipment.
Effectively utilizes the heat of the molded sand, reduces energy waste, and provides a reusable heat source.
Smart Images
Figure CN222999625U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting, in particular to a residual heat recovery device for casting molding sand. Background Art
[0002] In the casting industry, lost foam casting is one of the emerging and most advanced casting processes. In the lost foam casting process, a foam model similar to the size and shape of the casting is usually bonded and combined into a model. After brushing and drying the refractory coating, the model is placed in a sand box, and then dry sand is filled in and vibrated to form a mold. Finally, casting is carried out under negative pressure to gasify the model, and the liquid metal occupies the position of the model. After the casting is taken out of the sand mold, the entire sand mold disappears and becomes scattered sand. Since the molten iron at about 1500 °C transfers heat to the sand, and the sand needs to be cooled to below 60 °C before reuse, the residual heat of the sand cannot be effectively utilized during the cooling period, which results in a large amount of heat waste. Content of the Utility Model
[0003] In order to overcome the above defects existing in the prior art, the utility model provides a residual heat recovery device for casting molding sand.
[0004] The technical solution adopted by the utility model to solve its technical problems is: a residual heat recovery device for casting molding sand, including a heat exchange mechanism. The heat exchange mechanism is composed of a plurality of groups of heat exchangers spliced end to end. An exchange cavity is arranged inside the heat exchanger, and a plurality of groups of sand dropping pipes are arranged in the exchange cavity. A sand bin is fixedly installed at the top of the heat exchange mechanism, and the sand dropping pipes are communicated with the inside of the sand bin. A discharge hopper communicated with the sand dropping pipes is fixedly installed at the bottom of the heat exchange mechanism. A first valve mechanism is arranged at the top of the discharge hopper, and a discharge port is arranged at the bottom of the discharge hopper. A second valve mechanism is arranged at the discharge port.
[0005] Further, sealing plates are respectively fixedly installed at the upper and lower ends of the heat exchanger. The sand dropping pipes are fixedly installed on the sealing plates. The top ends of the sand dropping pipes are flush with the top surfaces of the sealing plates. Plug-in slots are arranged at the top ends of the sand dropping pipes, and plug-in parts corresponding to the plug-in slots are arranged at the bottom ends of the sand dropping pipes.
[0006] Further, a water outlet and a water inlet are formed in the side wall of the heat exchanger, and the water outlet and the water inlet are communicated with the inside of the exchange cavity.
[0007] Further, the first valve mechanism includes a first sieve plate fixedly installed at the top of the discharge hopper. A second sieve plate is movably installed at the bottom of the first sieve plate. A plurality of groups of first sieve holes are uniformly sealed on the first sieve plate, and second sieve holes corresponding to the first sieve holes are formed on the second sieve plate.
[0008] Further, an installation groove is provided on the top side wall of the discharge hopper. A gear is movably installed in the installation groove. A first motor is fixedly installed at the bottom of the installation groove. The power output shaft of the first motor is fixedly connected to the gear. A tooth portion matching the gear is provided at the edge of the second sieve plate. The second sieve plate is rotatably connected to the first sieve plate, and the second sieve plate and the first sieve plate are coaxially arranged.
[0009] Further, a temperature sensor is fixedly installed in the installation groove. The temperature of the molding sand entering the feed hopper is detected by the temperature sensor. If the temperature of the molding sand is higher than the set value, the first motor drives the second sieve plate to rotate.
[0010] Further, the second valve mechanism includes a valve plate. The valve plate is a disc-shaped structure matching the size of the discharge port. The valve plate is rotatably installed on the inner side wall of the discharge port. A second motor is fixedly installed on the outer side wall of the discharge port. The power output shaft of the second motor is connected to the rotating shaft of the valve plate.
[0011] Further, the sand bin is of a cylindrical structure. Two groups of level sensors are provided on the inner side of the sand bin. The two groups of level sensors are respectively installed at the upper and lower ends of the sand bin.
[0012] The beneficial effect of the present utility model is that through the design that the heat exchanger is internally provided with a heat exchange cavity, a plurality of groups of sand dropping pipes are arranged in the heat exchange cavity. The molding sand in the sand bin enters the sand dropping pipes. Cold water circulates in the heat exchange cavity. Heat exchange treatment is carried out between the cold water and the molding sand. During the cooling process of the molding sand, the cold water is heated into hot water, and the hot water is conveyed to the heating equipment for use, thereby effectively utilizing the heat of the molding sand and avoiding energy waste. Description of the Drawings
[0013] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;
[0015] Figure 2 is the front view of the present utility model;
[0016] Figure 3 is Figure 2 the sectional structural schematic diagram in the A-A direction of
[0017] Figure 4 is Figure 3 the sectional structural schematic diagram in the B-B direction of
[0018] Figure 5 is Figure 3 the partial enlarged view of area C in
[0019] Figure 6 This is a schematic structural diagram of the heat exchanger of the present utility model.
[0020] In the figure: 1. Heat exchanger, 11. Heat exchange chamber, 12. Sealing plate, 13. Water outlet, 14. Water inlet, 2. Sand dropping pipe, 21. Insertion slot, 22. Insertion part, 3. Discharge hopper, 31. Discharge port, 32. Installation slot, 33. Gear, 34. First motor, 4. First sieve plate, 41. First sieve holes, 5. Second sieve plate, 51. Second sieve holes, 52. Tooth part, 6. Temperature sensor, 7. Valve plate, 8. Second motor, 9. Sand bin, 10. Material level sensor. Detailed implementation manners
[0021] In order to more clearly illustrate the technical solution of the present utility model, the present utility model will be further described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only one embodiment of the present utility model. For those of ordinary skill in the art, without creative efforts, other embodiments obtained based on this drawing and embodiment all fall within the protection scope of the present utility model.
[0022] According to Figures 1-6 As shown, a casting sand waste heat recovery device includes a heat exchange mechanism. The heat exchange mechanism is composed of several groups of heat exchangers 1 spliced end to end. An internal heat exchange chamber 11 is provided in the heat exchanger 1. A number of sand dropping pipes 2 are arranged in the heat exchange chamber 11. A sand bin 9 is fixedly installed at the top of the heat exchange mechanism. The sand dropping pipe 2 is internally connected to the sand bin 9. A discharge hopper 3 connected to the sand dropping pipe 2 is fixedly installed at the bottom of the heat exchange mechanism. A first valve mechanism is provided at the top of the discharge hopper 3. A discharge port 31 is provided at the bottom of the discharge hopper 3. A second valve mechanism is provided at the discharge port 31.
[0023] In this embodiment, sealing plates 12 are respectively fixedly installed at the upper and lower ends of the heat exchanger 1. The sand dropping pipe 2 is fixedly installed on the sealing plate 12. The top end of the sand dropping pipe 2 is flush with the top surface of the sealing plate 12. An insertion slot 21 is provided at the top end of the sand dropping pipe 2. A corresponding insertion part 22 is provided at the bottom end of the sand dropping pipe 2. The sand dropping pipes 2 of two adjacent heat exchangers are connected end to end with each other through the cooperation of the insertion slot 21 and the insertion part 22, so that the molding sand flows from the sand bin 9 through the sand dropping pipe 2 to the discharge hopper 3.
[0024] In this embodiment, a water outlet 13 and a water inlet 14 are provided on the side wall of the heat exchanger 1. The water outlet 13 and the water inlet 14 are internally connected to the heat exchange chamber 11. Cold water enters the heat exchange chamber 11 through the water inlet 14. The heat of the molding sand is transmitted to the cold water in the heat exchange chamber 11 through the pipe wall of the sand dropping pipe 2. After the cold water is heated by the molding sand and becomes hot water, it flows outwards from the water outlet 13. The water outlet 13 is located above the water inlet 14 to facilitate the circulation of hot water in the heat exchanger 1.
[0025] In this embodiment, the first valve mechanism includes a first sieve plate 4, which is fixedly installed at the top end of the discharge hopper 3. A second sieve plate 5 is movably installed at the bottom of the first sieve plate 4. A number of groups of first sieve holes 41 are evenly sealed on the first sieve plate 4. Second sieve holes 51 corresponding to the first sieve holes 41 are formed on the second sieve plate 5. By moving the second sieve plate 5 to displace the second sieve holes 51 from the first sieve holes 41, the molding sand in the heat exchanger 1 is prevented from entering the discharge hopper 3.
[0026] In this embodiment, an installation groove 32 is provided on the side wall at the top end of the discharge hopper 3. A gear 33 is movably installed in the installation groove 32. A first motor 34 is fixedly installed at the bottom of the installation groove 32. The power output shaft of the first motor 34 is fixedly connected to the gear 33. A tooth portion 52 cooperating with the gear 33 is provided at the edge of the second sieve plate 5. The second sieve plate 5 is rotationally connected to the first sieve plate 4 and is coaxially arranged with the first sieve plate 4. By driving the gear 33 to rotate through the first motor 34, the second sieve plate 5 is rotated on the first sieve plate 4 under the cooperation of the gear 33 and the tooth portion 52.
[0027] In this embodiment, a temperature sensor 6 is fixedly installed in the installation groove 32. The temperature of the molding sand entering the feed hopper is detected by the temperature sensor 6. If the temperature of the molding sand is higher than the set value, the first motor 34 drives the second sieve plate 5 to rotate, so that the second sieve holes 51 are displaced from the first sieve holes 41, and the molding sand is continuously cooled in the heat exchanger 1.
[0028] In this embodiment, the second valve mechanism includes a valve plate 7. The valve plate 7 is a disc-shaped structure matching the size of the discharge port 31. The valve plate 7 is rotatably installed on the inner side wall of the discharge port 31. A second motor 8 is fixedly installed on the outer side wall of the discharge port 31. The power output shaft of the second motor 8 is connected to the rotating shaft of the valve plate 7. By driving the valve plate 7 to rotate in the discharge port 31 through the second motor 8, the opening and closing of the second valve mechanism are realized. In addition, the molding sand can fall evenly by adjusting the opening size of the valve plate 7 to cooperate with the subsequent transportation equipment.
[0029] In this embodiment, the sand bin 9 is of a cylindrical structure. Two level sensors 10 are provided on the inner side of the sand bin 9. The two level sensors 10 are respectively installed at the upper and lower ends of the sand bin 9. The molding sand is transported from the ground to the sand bin through a feeding elevator. The storage amount of the molding sand in the sand bin 9 is detected by the level sensors 10. When the molding sand is lower than the lower level sensor 10, the first valve mechanism is closed, so that the sand dropping pipe 2 can be filled with molding sand. When the molding sand is higher than the lower level sensor 10, the first valve mechanism is opened to enable the molding sand to continuously fall. When the molding sand is higher than the upper level sensor 10, the feeding elevator stops working.
[0030] When the utility model is in use, the high-temperature molding sand is conveyed into the sand bin 9 by a feeding elevator. The molding sand in the sand bin 9 falls into the discharge hopper 3 through the sand dropping pipe 2. During the falling process, the molding sand exchanges heat with the cold water circulating in the heat exchange cavity 11. The cold water absorbs the heat of the molding sand, and the hot water heated by the molding sand is conveyed to the heating equipment in the factory for use, thereby effectively utilizing the heat of the molding sand and avoiding energy waste. The cooled molding sand is discharged through the discharge hopper 3 and then recycled for reuse.
[0031] The above embodiments are only exemplary embodiments of the utility model and are not used to limit the utility model. The protection scope of the utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions within the essence and protection scope of the utility model, and such modifications or equivalent substitutions should also be regarded as falling within the protection scope of the utility model.
Claims
1. A foundry sand waste heat recovery device, characterized in that: The invention comprises a heat exchange mechanism, wherein the heat exchange mechanism is composed of a plurality of heat exchangers (1) connected end to end, wherein a heat exchange chamber (11) is provided inside the heat exchanger (1), wherein a plurality of sand falling pipes (2) are provided inside the heat exchange chamber (11), a sand bin (9) is fixedly installed at the top of the heat exchange mechanism, wherein the sand falling pipes (2) are connected to the inside of the sand bin (9), and a discharge hopper (3) connected to the sand falling pipes (2) is fixedly installed at the bottom of the heat exchange mechanism, wherein a first valve mechanism is provided at the top of the discharge hopper (3), a discharge port (31) is provided at the bottom of the discharge hopper (3), and a second valve mechanism is provided at the discharge port (31).
2. A foundry sand waste heat recovery device according to claim 1, characterized in that: Sealing plates (12) are fixedly mounted at the upper and lower ends of the heat exchanger (1), respectively; the sand falling pipe (2) is fixedly mounted on the sealing plate (12); the top end of the sand falling pipe (2) is flush with the top surface of the sealing plate (12); a plug-in groove (21) is provided at the top end of the sand falling pipe (2); and a plug-in portion (22) corresponding to the plug-in groove (21) is provided at the bottom end of the sand falling pipe (2).
3. A foundry sand waste heat recovery device according to claim 2, characterized in that: A water outlet (13) and a water inlet (14) are provided on the side wall of the heat exchanger (1), and the water outlet (13) and the water inlet (14) are connected to the interior of the heat exchange chamber (11).
4. The foundry sand waste heat recovery device according to claim 1, characterized in that: The first valve mechanism comprises a first sieve plate (4), the first sieve plate (4) being fixedly mounted on the top of the discharge hopper (3), a second sieve plate (5) being movably mounted on the bottom of the first sieve plate (4), a plurality of groups of first sieve holes (41) being evenly and tightly sealed on the first sieve plate (4), and second sieve holes (51) corresponding to the first sieve holes (41) being opened on the second sieve plate (5).
5. A foundry sand waste heat recovery device according to claim 4, characterized in that: A mounting groove (32) is provided on the top side wall of the discharge hopper (3), a gear (33) is movably installed in the mounting groove (32), a first motor (34) is fixedly installed at the bottom of the mounting groove (32), a power output shaft of the first motor (34) is fixedly connected to the gear (33), a tooth portion (52) matching with the gear (33) is provided at the edge of the second sieve plate (5), the second sieve plate (5) is rotatably connected to the first sieve plate (4), and the second sieve plate (5) and the first sieve plate (4) are coaxially arranged.
6. A foundry sand waste heat recovery device according to claim 5, characterized in that: A temperature sensor (6) is fixedly installed in the installation groove (32), and the temperature of the molding sand entering the feed hopper is detected by the temperature sensor (6). If the molding sand temperature is higher than a set value, the first motor (34) drives the second sieve plate (5) to rotate.
7. The foundry sand waste heat recovery device according to claim 1, characterized in that: The second valve mechanism comprises a valve plate (7), the valve plate (7) being a disc-shaped structure of a size matching that of the discharge port (31), the valve plate (7) being rotatably mounted on the inner wall of the discharge port (31), the outer wall of the discharge port (31) being fixedly mounted with a second motor (8), the power output shaft of the second motor (8) being connected to the rotating shaft of the valve plate (7) with each other.
8. The foundry sand waste heat recovery device according to claim 1, characterized in that: The sand bin (9) is a cylindrical structure. Two groups of material level sensors (10) are arranged on the inner side of the sand bin (9). The two groups of material level sensors (10) are respectively installed at the upper and lower ends of the sand bin (9).