Automatic regeneration device suitable for molding sand for binder 3D printing

Abstract

The utility model discloses an automatic regeneration device suitable for molding sand for binder 3D printing. Comprising a first crushing bin for preliminarily crushing molding sand, a second crushing bin for further crushing the molding sand, a screening bin for screening the crushed molding sand, a high-temperature baking area for performing high-temperature treatment on the screened molding sand, and a transportation area for transporting the treated molding sand. The molding sand recycling device solves the problems that a traditional molding sand recycling device is only limited to recycling and screening unbonded waste sand and mixing the unbonded waste sand with new sand for printing, molding sand of a sand mold is not reused, the sand using cost cannot be further reduced, and cyclic utilization cannot be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sand casting technical field, and specifically relates to an automatic regeneration device for molding sand for binder 3D printing. BACKGROUND

[0002] Nowadays, sand casting as a traditional casting method still accounts for a large proportion in the global casting industry and still occupies an important position in the manufacturing industry. It is particularly noted that binder jetting 3D sand casting is concerned for its unique advantages of high design freedom and high production efficiency, and has a very broad application prospect. However, the molding sand used in binder jetting 3D sand casting usually needs to have certain physical and chemical material properties, and the sand mold is a disposable mold, resulting in high material cost in actual application of the technology. According to the relevant data of Voxeljet, the binder jetting 3D printing molding sand accounts for more than 1 / 2 of the consumable cost, which shows that the reduction of molding sand cost is crucial to improve the economy of binder jetting 3D sand casting. At present, many researchers and related enterprises plan to develop low-cost molding sand to reduce material cost, which has a long cycle and high cost, especially for small and medium-sized enterprises, the research and development cost is high, which is difficult for them to bear.

[0003] Usually, the recycling of molding sand in the binder jetting 3D sand casting process is limited to recycling, screening and mixing the unbound waste sand with new sand for printing, and the molding sand of the sand mold is not reused. The sand regeneration technology, especially the hot regeneration, can effectively reduce the material cost of per ton of sand to 500 yuan or even lower, which is basically equivalent to the cost of per ton of sand in traditional casting, and saves the solid waste treatment cost, opening the key door for mass production of 3D printing sand mold process.

[0004] Therefore, the utility model provides an automatic regeneration device for molding sand for binder jetting 3D printing, which is a new method for recycling and reusing the molding sand after casting to reduce the cost of molding sand, not only reducing the production cost, but also improving the recycling rate of resources. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is that the traditional molding sand recycling device is only limited to recycling, screening and mixing the unbound waste sand with new sand for printing, and the molding sand of the sand mold is not reused, which cannot further reduce the cost of molding sand and cannot be recycled.

[0006] In order to solve the above technical problems, the utility model provides a kind of automatic regeneration device for molding sand suitable for binder 3D printing, including first crushing bin, second crushing bin, screening bin, high-temperature baking area and transport area, the inside of the first crushing bin is provided with multiple crushing wheels, the top of the first crushing bin is provided with feed inlet, the second crushing bin is arranged below the first crushing bin, the side of the second crushing bin is provided with driving motor, the output shaft of the driving motor is connected with main shaft, the main shaft is arranged in the inside of the second crushing bin, the main shaft is provided with crushing plate group, the screening bin is arranged below the second crushing bin, the inside of the screening bin is provided with second transport caterpillar belt, the downside of the screening bin is provided with receiving port, the high-temperature baking area is arranged below the screening bin, the high-temperature baking area includes first low-temperature area, high-temperature area and second low-temperature area, the first low-temperature area and the second low-temperature area are arranged on the two sides of high-temperature area, the transport area is arranged below the high-temperature baking area, the upside of the transport area is provided with vibrating screen port, the inside of the transport area is provided with first transport caterpillar belt, the design of the first crushing bin is used to preliminarily coarsely crush sand mold, and the sand mold is crushed into multiple sand mold blocks, the design of the second crushing bin is used to further crush multiple sand mold blocks into smaller sand mold particles, the design of the screening bin is used to separate sand mold particles and sand mold powder, and sand particles that do not meet the crushing size requirement continue to be crushed in the second crushing cabin, the design of the high-temperature baking area is used to heat the crushed sand mold, by low-temperature heating, high-temperature heating and finally low-temperature heating, to remove binder, curing agent and other organic matters in sand particles, and the design of the transport area transports sand particles to fall into receiving port.

[0007] Further, the number of the multiple crushing wheels is even, and the rotation directions of adjacent crushing wheels are opposite, and adjacent crushing wheel teeth are cross-mounted, the inside of the first crushing bin is provided with second vibrating screen discharging plate, the number of the multiple crushing wheels is even, and the rotation directions of adjacent crushing wheels are opposite, and adjacent crushing wheel teeth are cross-mounted, which is designed to further crush large sand molds into smaller sand mold blocks.

[0008] Further, it further includes box frame and photo-oxidation device, the box frame is arranged outside the first crushing bin, the second crushing bin, the screening bin, the high-temperature baking area and the transport area, the photo-oxidation device is arranged on the side of the box frame, the design of the box frame is used to fix the first crushing bin, the second crushing bin, the screening bin, the high-temperature baking area and the transport area, and the design of the photo-oxidation device is used to treat wastewater and waste gas generated in sand mold recycling operation.

[0009] Further, the bottom of the photo-oxidation device is provided with a waste gas pipeline, and a valve port is further arranged on the waste gas pipeline. The waste gas pipeline and the valve port are designed to transport the waste gas and waste water generated in the high-temperature baking area to the photo-oxidation device.

[0010] Further, a filter system is arranged between the box frame and the photo-oxidation device. A first dust removal port is arranged on the side of the first crushing bin, a second dust removal port is arranged on the side of the second crushing bin, and a third dust removal port is arranged on the side of the screening bin. The first dust removal port, the second dust removal port and the third dust removal port are connected and connected with the filter system. The filter system is designed to filter the waste gas and waste water generated in the first crushing bin, the second crushing bin and the screening bin.

[0011] Further, a feeding screw is arranged inside the high-temperature baking area. A feeding motor is arranged on the side of the feeding screw. The output shaft of the feeding motor is connected with the feeding screw. The feeding screw and the feeding motor are designed to transport the sand mold falling from the screening bin from the high-temperature baking area to the transport area and the photo-oxidation device.

[0012] Further, a first vibrating screen discharging plate is arranged on the side of the vibrating screen port. A first vibrating screen screen is arranged above the first vibrating screen discharging plate. A first vibrating screen spring is arranged above the first vibrating screen screen. A first vibrating screen support is arranged above the first vibrating screen spring. The upper side of the first vibrating screen support is connected with the high-temperature baking area. The first vibrating screen discharging plate, the first vibrating screen screen, the first vibrating screen spring and the first vibrating screen support are designed to screen the sand mold meeting the size to the transport area, and finally transport the sand mold meeting the size to the receiving port for collection by the staff.

[0013] Further, an upper heat insulation layer is arranged above the high-temperature baking area, and a lower heat insulation layer is arranged below the high-temperature baking area. The upper heat insulation layer and the lower heat insulation layer are designed to prevent the screening area and the transport area from being affected by the high temperature of the high-temperature baking area, causing damage to the internal structure.

[0014] Further, a second vibrating screen support is arranged on the upper side of the screening bin. A second vibrating screen spring and a hydraulic lifting device are arranged above the second vibrating screen support. The second vibrating screen spring and the hydraulic lifting device are connected with the second vibrating screen screen above. A receiving port is arranged on the side of the bottom of the screening bin. The second vibrating screen support, the second vibrating screen spring and the second vibrating screen screen are designed to screen the sand mold meeting the size to the screening area. The hydraulic lifting device is designed to adjust the second vibrating screen discharging plate to be inclined at a certain angle, and to transport the debris from the spading port to the debris recycling bin.

[0015] Further, the screening bin is provided with a scrap recycling bin on the side, and a scrap outlet is arranged on the top of the scrap recycling bin, and the scrap outlet is connected with the second crushing bin.

[0016] Further, the first crushing bin is used for the preliminary crushing of the sand mold, the second crushing bin is used for the further crushing of the sand mold, the screening bin is used for the screening of the sand mold, the high-temperature baking area is used for the high-temperature baking operation of the sand mold, the waste gas and the waste water are separated from the sand mold, and the sand mold is transported to the receiving port by the transportation area. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the utility model;

[0018] Figure 2 is a schematic view of the first crushing bin of the utility model;

[0019] Figure 3 is a schematic view of the second crushing bin of the utility model;

[0020] Figure 4 is a schematic view of the screening bin of the utility model;

[0021] Figure 5 is a schematic view of the high-temperature baking area of the utility model;

[0022] Figure 6 is a schematic view of the transportation area of the utility model.

[0023] The components include: 1. Box frame; 2. First crushing wheel; 3. Second crushing wheel; 4. Feed inlet; 5. First crushing chamber; 6. Third crushing wheel; 7. Fourth crushing wheel; 8. First dust removal port; 9. Photo-oxidation device; 10. Second dust removal port; 11. Screening chamber; 12. Third dust removal port; 13. Filtration system; 14. Valve port; 15. Exhaust gas pipeline; 16. Conveying screw; 17. First vibrating screen support; 18. First vibrating screen spring; 19. First vibrating screen discharge plate; 20. First vibrating screen screen mesh; 21. Vibrating screen. 21. First low-temperature zone; 22. High-temperature zone; 23. Upper insulation layer; 24. Lower insulation layer; 25. Second low-temperature zone; 26. First transport track; 27. Transport zone; 28. Second transport track; 29. ​​Second transport track; 30. Second vibrating screen support; 31. Debris recovery bin; 32. Second vibrating screen spring; 33. Hydraulic lifting device; 34. Second vibrating screen screen mesh; 35. Feeding port; 36. Main shaft; 37. Drive motor; 38. Crushing plate assembly; 39. Second crushing bin; 40. Second vibrating screen discharge plate; 41. Receiving port. Detailed Implementation

[0024] The following will describe in detail the implementation of this utility model with reference to the accompanying drawings and embodiments, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0025] Example 1

[0026] like Figures 1 to 6 An automated recycling device for molding sand used in binder 3D printing is shown, comprising a first crushing chamber 5, a second crushing chamber 39, a screening chamber 11, a high-temperature baking zone, and a transport zone 28. The first crushing chamber 5 has multiple crushing wheels inside and a feed inlet 4 at its top. The second crushing chamber 39 is located below the first crushing chamber 5, and a drive motor 37 is mounted on its side. The output shaft of the drive motor 37 is connected to a main shaft 36, which is located inside the second crushing chamber 39. Crushing plate assemblies 38 are arranged around the main shaft 36. The screening chamber 11 is located below the second crushing chamber 39. A second conveyor belt 29 is installed inside the screening chamber 11. A material receiving port 41 is located on the lower side of the screening chamber 11. The high-temperature baking zone is located below the screening chamber 11 and includes a first low-temperature zone 22, a high-temperature zone 23, and a second low-temperature zone 26. The first low-temperature zone 22 and the second low-temperature zone 26 are located on either side of the high-temperature zone 23. The transport zone 28 is located below the high-temperature baking zone. A vibrating screen 21 is installed on the upper side of the transport zone 28, and a first conveyor belt 27 is installed inside the transport zone 28.

[0027] Example 2

[0028] like Figures 1 to 6 The illustrated automated recycling device for molding sand used in 3D printing of binders, based on Embodiment 1, features an even number of crushing wheels with adjacent wheels rotating in opposite directions and their teeth intersecting. A second vibrating screen discharge plate 40 is located inside the first crushing chamber 5. The device also includes a housing frame 1 and a photo-oxidation device 9. The housing frame 1 is located outside the first crushing chamber 5, the second crushing chamber 39, the screening chamber 11, the high-temperature baking zone, and the transport zone 28. The photo-oxidation device 9 is located on the side of the housing frame 1. The bottom of the photo-oxidation device 9 is equipped with an exhaust gas pipe 15, and a valve port 14 is also provided on the exhaust gas pipe 15. A filtration system 13 is provided between the housing frame 1 and the photo-oxidation device 9. A first dust removal port 8 is provided on the side of the first crushing chamber 5, a second dust removal port 10 is provided on the side of the second crushing chamber 39, and a third dust removal port 12 is provided on the side of the screening chamber 11. The first dust removal port 8, the second dust removal port 10, and the third dust removal port 12 are connected and connected to the filtration system 13. A conveying screw 16 is provided inside the high-temperature baking zone. A feeding motor 161 is provided on the side of the screw 16, and the output shaft of the feeding motor 161 is connected to the feeding screw 16. A first vibrating screen discharge plate 19 is provided on the side of the vibrating screen opening 21. A first vibrating screen mesh 20 is provided above the first vibrating screen discharge plate 19. A first vibrating screen spring 18 is provided above the first vibrating screen mesh 20. A first vibrating screen support 17 is provided above the first vibrating screen spring 18. The upper side of the first vibrating screen support 17 is connected to the high-temperature baking zone. An upper heat insulation layer 24 is provided above the high-temperature baking zone. A lower heat insulation layer 25 is provided below the high-temperature baking zone. A second vibrating screen support 30 is provided on the upper side of the screening chamber 11. A second vibrating screen spring 32 and a hydraulic lifting device 33 are provided above the second vibrating screen support 30. A second vibrating screen mesh 34 is connected above the second vibrating screen spring 32 and the hydraulic lifting device 33. A material receiving port 41 is provided on the bottom side of the screening chamber 11. A debris recovery chamber 31 is provided on the side of the screening chamber 11. A material scraping port 35 is provided on the top side of the debris recovery chamber 31. The material scraping port 35 is connected to the second crushing chamber 39.

[0029] Example 3

[0030] like Figures 1 to 6 The automated recycling device shown is suitable for molding sand used in adhesive 3D printing. Its usage method is as follows:

[0031] S1. The sand block after 3D printing and casting with binder spraying is put in through the feed port 4;

[0032] S2, the sand block falls into the first crushing cabin 5, two crushing wheels are a group, that is, the first crushing wheel 2 and the second crushing wheel 3 are a group, the third crushing wheel 6 and the fourth crushing wheel 7 are a group, two groups of crushing wheels move towards each other to coarsely crush the sand block, and the size of the sand block after crushing is less than 5mm;

[0033] S3, the sand block coarsely crushed in the first crushing cabin 5 falls into the second crushing cabin 39 under the action of gravity, the driving motor 37 drives the main shaft 36 to rotate, the main shaft 36 drives the crushing plate group 38 to rotate, and the coarsely crushed sand block is finely crushed under the action of the crushing plate group 38, the sand particles meeting the screening size fall into the screening cabin 11 through the second vibrating screen screen 34, and the sand particles not meeting the crushing size requirement continue to be crushed in the second crushing cabin 39, the metal blocks and scraps remaining in the sand can be scraped into the scrap recycling cabin 31 by opening the scraping opening 35, and in this process, the hydraulic lifting device 33 is lowered, so that the second vibrating screen screen 34 is inclined to the scraping opening 35;

[0034] S4, the sand particles meeting the size requirement fall onto the second conveying caterpillar 29 in the screening cabin 11, and the second conveying caterpillar 29 rotates clockwise to convey the sand particles to the receiving opening 41;

[0035] S5, the sand particles through the receiving opening 41 further fall into the high-temperature baking area (the first low-temperature area 22, the high-temperature area 23, and the second low-temperature area 26), and the sand particles are transported from left to right under the rotating action of the conveying screw 16, that is, the sand particles move in the order of the second low-temperature area 26, the high-temperature area 23, and the first low-temperature area 22, preferably, the temperature setting range of the low-temperature area is 150-300 DEG C, and the temperature setting range of the high-temperature area is 500-800 DEG C, for removing the organic matter such as the binder and the curing agent in the sand particles;

[0036] S6, the sand particles meeting the size requirement after removal are vibrated and screened by the first vibrating screen (the first vibrating screen support 17, the first vibrating screen spring 18, the first vibrating screen falling plate 19, and the first vibrating screen screen 20), and the purpose is mainly to make the sand particles transported by the conveying screw 16 more loose and not clumped;

[0037] S7, the sand particles falling through the vibrating screen opening 21 fall into the first conveying caterpillar 27, and can be packaged and stored, completing the whole process of crushing.

Claims

1. An automated recycling device for molding sand used in binder 3D printing, characterized in that: The system includes a first crushing chamber (5), a second crushing chamber (39), a screening chamber (11), a high-temperature baking zone, and a transport zone (28). The first crushing chamber (5) has multiple crushing wheels inside, and a feed inlet (4) is located above it. The second crushing chamber (39) is located below the first crushing chamber (5). A drive motor (37) is located on the side of the second crushing chamber (39), and the output shaft of the drive motor (37) is connected to a main shaft (36). The main shaft (36) is located inside the second crushing chamber (39), and a set of crushing plates (38) is arranged around the main shaft (36). The screening chamber (11) is located in the second crushing chamber. Below the crushing chamber (39), the screening chamber (11) is provided with a second conveyor belt (29). The screening chamber (11) is provided with a receiving port (41) on its lower side. The high-temperature baking zone is located below the screening chamber (11). The high-temperature baking zone includes a first low-temperature zone (22), a high-temperature zone (23), and a second low-temperature zone (26). The first low-temperature zone (22) and the second low-temperature zone (26) are located on both sides of the high-temperature zone (23). The transport zone (28) is located below the high-temperature baking zone. The transport zone (28) is provided with a vibrating screen (21) on its upper side. The transport zone (28) is provided with a first conveyor belt (27) inside its interior.

2. An automated recycling device for molding sand used in binder 3D printing according to claim 1, characterized in that: The number of the plurality of crushing wheels is even, and the rotation directions of adjacent crushing wheels are opposite. The teeth of adjacent crushing wheels are installed in a cross pattern. A second vibrating screen discharge plate (40) is provided inside the first crushing chamber (5).

3. An automated recycling device for molding sand used in binder 3D printing according to claim 1, characterized in that: It also includes a box frame (1) and a photo-oxidation device (9). The box frame (1) is located outside the first crushing chamber (5), the second crushing chamber (39), the screening chamber (11), the high-temperature baking zone and the transportation zone (28). The photo-oxidation device (9) is located on the side of the box frame (1).

4. An automated recycling device for molding sand used in binder 3D printing according to claim 3, characterized in that: The bottom of the photo-oxidation device (9) is provided with an exhaust gas pipe (15), and a valve port (14) is also provided on the exhaust gas pipe (15).

5. An automated recycling device for molding sand used in binder 3D printing according to claim 4, characterized in that: A filtration system (13) is provided between the box frame (1) and the photo-oxidation device (9). A first dust removal port (8) is provided on the side of the first crushing chamber (5), a second dust removal port (10) is provided on the side of the second crushing chamber (39), and a third dust removal port (12) is provided on the side of the screening chamber (11). The first dust removal port (8), the second dust removal port (10) and the third dust removal port (12) are connected and connected to the filtration system (13).

6. An automated recycling device for molding sand used in binder 3D printing according to claim 1, characterized in that: The high-temperature baking zone is equipped with a feeding screw (16), and a feeding motor (161) is provided on the side of the feeding screw (16). The output shaft of the feeding motor (161) is connected to the feeding screw (16).

7. An automated recycling device for molding sand used in binder 3D printing according to claim 1, characterized in that: A first vibrating screen discharge plate (19) is provided on the side of the vibrating screen opening (21). A first vibrating screen screen (20) is provided above the first vibrating screen discharge plate (19). A first vibrating screen spring (18) is provided above the first vibrating screen screen (20). A first vibrating screen support (17) is provided above the first vibrating screen spring (18). The upper side of the first vibrating screen support (17) is connected to the high-temperature baking zone.

8. An automated recycling device for molding sand used in binder 3D printing according to claim 6, characterized in that: An upper heat insulation layer (24) is provided above the high-temperature baking zone, and a lower heat insulation layer (25) is provided below the high-temperature baking zone.

9. An automated recycling device for molding sand used in binder 3D printing according to claim 1, characterized in that: A second vibrating screen support (30) is provided on the upper side of the screening chamber (11). A second vibrating screen spring (32) and a hydraulic lifting device (33) are provided above the second vibrating screen support (30). A second vibrating screen mesh (34) is connected above the second vibrating screen spring (32) and the hydraulic lifting device (33). A material receiving port (41) is provided on the bottom side of the screening chamber (11).

10. An automated recycling device for molding sand used in binder 3D printing according to claim 1, characterized in that: The screening chamber (11) is provided with a debris recovery chamber (31) on its side, and a material feeding port (35) is provided on the top side of the debris recovery chamber (31), which is connected to the second crushing chamber (39).

Images