A foundry sand recycling device for casting production and a recycling process thereof

Abstract

This invention relates to the field of intelligent casting island technology, specifically to a casting sand regeneration device and its regeneration process for casting production. The device includes a base frame, a feeding trough fixedly connected to the top of the base frame, a shell fixedly connected to the top of the feeding trough, a drive shaft rotatably connected to the center of the shell, a cross-shaped central seat fixedly connected to the outer wall of the drive shaft, and four circumferentially arrayed screening plates slidably connected to the outer wall of the cross-shaped central seat. Each screening plate has sliding rods fixedly connected to both sides. This invention enhances sand particle flowability through the linkage and shaking of the corrugated groove and screening plates. A magnetic roller rotates and adsorbs most magnetic impurities. The old sand after initial separation slides down the inclined surface of the receiving plate. The reverse motion design, through shearing force and centrifugal action, fully disperses the sand particles. The reverse rotation of the magnetic roller simultaneously achieves sand particle scattering, ensuring uniform load on the dewatering mesh belt and avoiding localized overheating or uneven drying. Closed-loop circulation ensures repeated processing of sand particles, centralized recovery of impurities, and improved resource utilization.

Description

Technical Field

[0001] This invention relates to the field of intelligent casting island technology, and in particular to a casting sand regeneration device and its regeneration process for casting production. Background Technology

[0002] In the foundry industry, sand recycling technology is crucial because it can reduce raw material costs, reduce waste emissions, and improve environmental benefits. Foundry waste sand refers to the waste generated during the foundry production process, mainly composed of sand, sand cores, and sand molds.

[0003] The invention patent with authorization announcement number CN117505774B discloses a foundry waste sand recycling dewatering screen, including a foundry waste sand dewatering screen base assembly. The base assembly contains a magnetic material magnetic separation roller assembly, and multiple sets of foundry waste sand agglomeration pressure roller assemblies are arranged on top of the base assembly. The magnetic material magnetic separation roller assembly forms a double-layer magnetic separation roller structure with inner and outer rings inside the base assembly. The foundry waste sand agglomeration pressure roller assemblies form a passively rolling and actively pressing grinding and crushing roller structure on top of the base assembly. The foundry waste sand dewatering screen base assembly converts the rotational power of the motor into a horizontal reciprocating drag force on the screen, thus achieving the screening of foundry waste sand. The multiple sets of foundry waste sand agglomeration pressure roller assemblies move up and down on the screen. Due to the horizontal reciprocating dragging action of the base assembly, the pressure rollers on the foundry waste sand agglomeration pressure roller assemblies passively roll.

[0004] However, the above-mentioned invention patent still has the following problems: When the screen moves horizontally back and forth, the pressure roller needs to complete vertical pressing and passive rolling at the same time. If the hardness of the foundry waste sand is uneven, it may cause the pressure roller to have excessive instantaneous resistance, which will aggravate the deformation of the screen. Although the rotation design of the magnetic separation roller can promote the flying of waste sand to enhance dehydration, the high-speed rotating magnetic separation roller will adsorb iron dust, causing the magnetic material to mix with the waste sand and fly. The thermal conductivity of the magnetic material is much higher than that of the foundry sand. When metal particles are mixed with the waste sand and fly, the metal will preferentially absorb the heat of the heating plate. The heat cannot be effectively transferred to the surrounding sand particles, resulting in uneven heating of the sand body and insufficient dehydration. The pressure roller relies on the reciprocating motion of the screen to achieve passive rolling. If the screen speed is low (such as when processing sticky and wet waste sand), the pressure roller will not roll enough and can only achieve crushing rather than full crushing. Large particles may clog the holes. The fixed circumferential trajectory of the auxiliary magnetic separation roller results in a magnetic separation blind zone at the edge of the dehydration chamber. Fine iron filings may escape from both sides. Therefore, a foundry sand regeneration device and its regeneration process for casting production are proposed to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the background art by proposing a casting sand regeneration device and its regeneration process for casting production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A foundry sand recycling device for casting production includes a base frame, a feeding trough fixedly connected to the top of the base frame, a shell fixedly connected to the top of the feeding trough, a drive shaft rotatably connected to the center of the shell, a cross center seat fixedly connected to the outer wall of the drive shaft, four screening plates arranged in a circumferential array slidably connected to the outer wall of the cross center seat, a slide rod fixedly connected to both sides of each screening plate, and circular slide rails and corrugated grooves opened on both sides of the shell, the two ends of the corrugated grooves communicating with the two ends of the circular slide rails, and the slide rods slidably connected to the inner wall of the shell through the corrugated grooves and the circular slide rails. The inner wall of the feeding trough is fixedly connected with a discharge guide plate 1 and a discharge guide plate 2. A magnetic suction roller is set below the discharge guide plate 1. The magnetic suction roller is rotatably connected to the feeding trough through a shaft 1. A transmission gear 3 is fixedly connected to the end of the shaft 1. A receiving plate and a scraper are respectively set on both sides of the magnetic suction roller. Both the receiving plate and the scraper are fixedly connected to the inside of the feeding trough. Two crushing rollers are rotatably connected to the top of the shell. A drive motor is fixed to the outer wall of the shell. The output shaft of the drive motor is fixed to one of the crushing rollers. A feed guide plate is provided below the crushing roller and is fixed to the shell.

[0007] Preferably, the ends of the two crushing rollers away from the drive motor are both fixedly connected to crushing gears via a shaft. The two crushing gears mesh with each other. One side of one of the crushing gears is fixedly connected to a small transmission gear via a shaft. One end of the transmission shaft is fixedly connected to a large transmission gear. A transmission chain is sleeved on the outer wall of the large transmission gear and the small transmission gear.

[0008] Preferably, a second transmission gear is fixed to one side of another crushing gear via a shaft, and a second transmission chain is sleeved on the outer wall of the second and third transmission gears.

[0009] Preferably, a flow channel is provided above the scraper, and a collection channel is fixedly connected to one side of the feeding channel, with the flow channel and the collection channel being connected.

[0010] Preferably, a discharge trough is fixedly connected to the outer wall of the shell, the discharge trough is connected to the shell through a discharge port, and a guide pipe is connected to one side of the discharge trough.

[0011] Preferably, a feeding rack is fixedly connected to the top of the base, and a lifting mechanism is provided inside the feeding rack.

[0012] Preferably, a dehydration mesh belt is rotatably connected inside the base frame, and a dehydration chamber is provided below the dehydration mesh belt, with a hot air mechanism installed inside the dehydration chamber.

[0013] In the above-mentioned casting sand regeneration process for casting production, the aforementioned casting sand regeneration device for casting production is applied, including the following steps: S1. The old sand is vertically transported to the crushing station via a lifting mechanism; S2. Two opposing rotating crushing rollers are used to crush the old sand by squeezing. S3. The crushed sand particles fall onto the screening plate and are sifted through the corrugated trough. S4. Qualified sand particles undergo two-stage magnetic separation. The sand particles are initially separated by magnetic rollers. After the initial separation, the sand particles slide down the receiving plate and are then separated a second time by a reverse impact. S5. The scraper automatically removes magnetic impurities adsorbed on the surface of the magnetic roller.

[0014] S6. The magnetically separated sand particles are evenly distributed on the dewatering mesh belt and dried by hot air circulation. S7. Substandard sand particles are automatically returned to the lifting mechanism through the guide pipe.

[0015] Compared with existing technologies, the advantages of this invention are as follows: This invention uses crushing rollers to initially crush old sand. Substandard sand particles are returned to the lifting mechanism via guide pipes for further crushing, forming a closed-loop cycle. This significantly improves crushing efficiency, ensures sand particle uniformity, and avoids repeated manual intervention. The linkage between the corrugated trough and the screening plate enhances sand particle flowability and increases screening speed, effectively solving the problems of accumulation and clogging in traditional vibrating screens. The rotating magnetic rollers adsorb most magnetic impurities, which are automatically peeled and collected by scrapers. The old sand after initial separation slides down the inclined surface of the receiving plate and impacts the counter-rotating magnetic rollers again at a controllable flow rate. The counter-motion design, through shearing force and centrifugal action, fully disperses the sand particles, preventing clumping. Simultaneously, the counter-rotating magnetic rollers scatter the sand particles, ensuring uniform load on the dewatering mesh belt and preventing localized overheating or uneven drying. From lifting, crushing, magnetic separation to dewatering and drying, the entire process is automated. The closed-loop cycle ensures 100% reprocessing of sand particles, centralized recovery of impurities, and improved resource utilization. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the dewatering mesh belt in this invention; Figure 3 This is a schematic diagram of the internal structure of the casing of the present invention. Figure 1 ; Figure 4 This is the present invention. Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 This is the present invention. Figure 3 Schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the internal structure of the casing of the present invention. Figure 2 ; Figure 7 This is the present invention. Figure 6 Schematic diagram of the structure at point C; Figure 8 This is a schematic diagram of the magnetic attraction part of the present invention; Figure 9 This is the present invention. Figure 1 Schematic diagram of the structure at point D.

[0017] In the diagram: 1. Base frame; 2. Feeding frame; 3. Base one; 4. Lifting mechanism; 5. Dewatering mesh belt; 6. Small transmission gear one; 7. Transmission chain one; 8. Transmission chain two; 9. Large transmission gear; 10. Transmission gear two; 11. Guide pipe; 12. Shell; 13. Feed trough; 14. Discharge trough; 15. Drive motor; 16. Crushing roller; 17. Feed guide plate; 18. Discharge guide plate one; 19. Discharge guide plate two; 20. Receiving plate; 21. Shaft one; 22. Transmission gear three; 23. Magnetic roller; 24. Collection trough; 25. Flow trough; 26. Scraper; 27. Slide rod; 28. Corrugated groove; 29. ​​Screening plate; 30. Cross center seat; 31. Circular slide rail; 32. Crushing gear; 33. Transmission shaft; 34. Discharge port; 35. Dewatering chamber. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Reference Figures 1-9A foundry sand regeneration device for casting production includes a base frame 1, a feeding trough 13 fixedly connected to the top of the base frame 1, a housing 12 fixedly connected to the top of the feeding trough 13, a drive shaft 33 rotatably connected to the center of the housing 12, a cross center seat 30 fixedly connected to the outer wall of the drive shaft 33, four screening plates 29 arranged in a circumferential array slidably connected to the outer wall of the cross center seat 30, and a slide rod 27 fixedly connected to both sides of each screening plate 29. Circular slide rails 31 and corrugated grooves 28 are provided on both sides of the housing 12, with the two ends of the corrugated grooves 28 communicating with the two ends of the circular slide rails 31. The slide rods 27 are slidably connected to the inner wall of the housing 12 through the corrugated grooves 28 and the circular slide rails 31. Two crushing rollers 16 are located away from the drive motor 15. The ends of the shaft are fixedly connected to crushing gears 32, which mesh with each other. A small transmission gear 6 is fixedly connected to one side of one of the crushing gears 32 via a shaft. A large transmission gear 9 is fixedly connected to one end of the transmission shaft 33. A transmission chain 7 is sleeved on the outer wall of the large transmission gear 9 and the small transmission gear 6. A feeding rack 2 is fixedly connected to the top of the base 3. A lifting mechanism 4 is provided inside the feeding rack 2. Two crushing rollers 16 are rotatably connected to the top of the housing 12. A drive motor 15 is fixedly connected to the outer wall of the housing 12. The output shaft of the drive motor 15 is fixedly connected to one of the crushing rollers 16. A feed guide plate 17 is provided below the crushing roller 16 and is fixedly connected to the housing 12.

[0021] In this embodiment, the foundry sand is placed on the lifting mechanism 4, which carries the old sand upward until it falls into the two crushing rollers 16. The drive motor 15 drives the two crushing rollers 16 to crush the old sand. The small transmission gear 6 drives the transmission shaft 33 to rotate in the same direction through the transmission chain 7. The old sand falls into the housing 12 along the feed guide plate 17 and into the screening plate 29. It moves along the corrugated groove 28, causing the screening plate 29 to shake, which enhances the flowability of the sand particles, speeds up the screening speed, and avoids the accumulation of old sand. The old sand with qualified size will fall onto the magnetic roller 23 along the discharge guide plate 18 and the discharge guide plate 29. The magnetic roller 23 rotates in the same direction as the transmission gear 20 through the shaft 21 and the transmission gear 3 22.

[0022] The inner wall of the feeding trough 13 is fixedly connected to a discharge guide plate 18 and a discharge guide plate 19. A magnetic roller 23 is provided below the discharge guide plate 18. The magnetic roller 23 is rotatably connected to the feeding trough 13 through a shaft 21. A transmission gear 22 is fixedly connected to the end of the shaft 21. A receiving plate 20 and a scraper 26 are respectively provided on both sides of the magnetic roller 23. Both the receiving plate 20 and the scraper 26 are fixedly connected to the inside of the feeding trough 13. A transmission gear 20 is fixedly connected to one side of another crushing gear 32 through a shaft. A transmission chain 28 is sleeved on the outer wall of the transmission gear 20 and the transmission gear 22. A flow groove 25 is opened above the scraper 26. A collection groove 24 is fixedly connected to one side of the feeding trough 13. The flow groove 25 and the collection groove 24 are connected.

[0023] In this embodiment, magnetic materials in the old sand are attracted by the magnetic roller 23. When the magnetic roller 23 rotates to the scraper 26, the magnetic impurities are peeled off by the fixed scraper 26 and fall into the collection tank 24, realizing the automatic discharge of magnetic materials. The old sand after the initial separation slides down the inclined surface of the receiving plate 20 and impacts the counter-rotating magnetic roller 23 again at a controllable flow rate. The counter-motion design uses shearing force and centrifugal action to fully disperse the sand particles, avoid agglomeration, and ensure that the magnetic materials are exposed and attracted again, and then flushed towards the magnetic roller 23 again, so as to avoid the absence of magnetic materials in the old sand.

[0024] The outer wall of the shell 12 is fixedly connected to a discharge trough 14, which is connected to the shell 12 through a discharge port 34. A guide pipe 11 is connected to one side of the discharge trough 14.

[0025] In this implementation scheme, the old sand that does not meet the size requirements will fall on the back of the previous screening plate 29 as the drive shaft 33 and the cross center seat 30 rotate. As the screening plate 29 tilts, it falls into the discharge chute 14 and returns to the lifting mechanism 4 through the guide pipe 11, where it is crushed again by the crushing roller 16, forming a closed-loop crushing process to ensure the uniformity of the final sand particles.

[0026] The base frame 1 is rotatably connected to a dehydration mesh belt 5, and a dehydration chamber 35 is provided below the dehydration mesh belt 5. A hot air mechanism is provided inside the dehydration chamber 35.

[0027] In this embodiment, the reverse rotation of the magnetic roller 23 not only enhances magnetic separation, but also distributes the old sand evenly on the dewatering mesh belt 5 through a scattering action, avoiding local accumulation and ensuring the uniformity of subsequent dewatering. The mesh belt surface adopts a perforated plate structure to further increase the air permeability of the sand particles. The shell 12 integrates a multi-stage hot air drying unit with controllable temperature. The hot and humid airflow penetrates the sand layer from the bottom up, quickly evaporating the moisture.

[0028] A casting sand regeneration process for casting production, which utilizes a casting sand regeneration device for casting production, includes the following steps: S1. The old sand is vertically transported to the crushing station via the lifting mechanism 4; S2. Two opposing rotating crushing rollers 16 are used to crush the old sand by squeezing. S3. The crushed sand particles fall onto the screening plate 29 and are shaken and screened through the corrugated groove 28. S4. Qualified sand particles undergo two-stage magnetic separation. The sand particles are initially separated by magnetic roller 23. After the initial separation, the sand particles slide down along the receiving plate 20 and are separated a second time by the second magnetic roller 23 in a reverse impact manner. S5. The scraper 26 automatically removes magnetic impurities adsorbed on the surface of the magnetic roller 23; S6. The magnetically separated sand particles are evenly distributed on the dewatering mesh belt 5 and dried by hot air circulation. S7. Substandard sand particles are automatically returned to the lifting mechanism 4 through the guide pipe 11.

[0029] The working principle and usage of this invention are explained in detail below: In use, the casting sand is placed on the lifting mechanism 4, which carries the old sand upward until it falls into the two crushing rollers 16. The drive motor 15 drives the two crushing rollers 16 to crush the old sand. The small transmission gear 6 drives the transmission shaft 33 to rotate in the same direction through the transmission chain 7. The old sand falls into the housing 12 along the feed guide plate 17 and into the screening plate 29. It moves along the corrugated groove 28, causing the screening plate 29 to shake, which enhances the fluidity of the sand particles, speeds up the screening speed, and prevents the accumulation of old sand. The old sand with qualified size will fall onto the magnetic suction roller 23 along the discharge guide plate 18 and the discharge guide plate 29. The magnetic suction roller 23 rotates in the same direction as the transmission gear 20 through the shaft 21 and the transmission gear 3 22.

[0030] The magnetic material in the old sand is attracted by the magnetic roller 23. When the magnetic roller 23 rotates to the scraper 26, the magnetic impurities are peeled off by the fixed scraper 26 and fall into the collection tank 24, realizing the automatic discharge of magnetic material. The old sand after the initial separation slides down the inclined surface of the receiving plate 20 and impacts the magnetic roller 23 rotating in the opposite direction again at a controllable flow rate. The reverse motion design uses shearing force and centrifugal action to fully disperse the sand particles, avoid agglomeration, and ensure that the magnetic material is exposed and attracted again, and then rushes to the magnetic roller 23 again, so as to avoid the absence of magnetic material in the old sand.

[0031] The reverse rotation of the magnetic roller 23 not only enhances magnetic separation, but also distributes the old sand evenly on the dewatering mesh belt 5 through a scattering action, avoiding local accumulation and ensuring the uniformity of subsequent dewatering. The mesh belt surface adopts a perforated plate structure to further increase the air permeability of the sand particles. The shell 12 integrates a multi-stage hot air drying unit with controllable temperature. The hot and humid airflow penetrates the sand layer from the bottom up, quickly evaporating the moisture.

[0032] The old sand that is not up to size will fall on the back of the previous screening plate 29 as the drive shaft 33 and the cross center seat 30 rotate. As the screening plate 29 tilts, it will fall into the discharge chute 14 and return to the lifting mechanism 4 through the guide pipe 11, where it will be crushed again by the crushing roller 16, forming a closed-loop crushing process to ensure the uniformity of the final sand particles.

[0033] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A casting sand regeneration device for casting production, comprising a base frame (1), characterized in that, The top of the base frame (1) is fixedly connected to the feeding trough (13), the top of the feeding trough (13) is fixedly connected to the shell (12), the center of the shell (12) is rotatably connected to the transmission shaft (33), the outer wall of the transmission shaft (33) is fixedly connected to the cross center seat (30), the outer wall of the cross center seat (30) is slidably connected to four screening plates (29) arranged in a circular array, each screening plate (29) is fixedly connected to both sides of the sliding rod (27), the shell (12) is provided with a circular slide rail (31) and a corrugated groove (28) on both sides, the two ends of the corrugated groove (28) are connected to the two ends of the circular slide rail (31), and the sliding rod (27) is slidably connected to the inner wall of the shell (12) through the corrugated groove (28) and the circular slide rail (31); The inner wall of the feeding trough (13) is fixedly connected with a discharge guide plate 1 (18) and a discharge guide plate 2 (19). A magnetic suction roller (23) is provided below the discharge guide plate 1 (18). The magnetic suction roller (23) is rotatably connected to the feeding trough (13) through a shaft 1 (21). A transmission gear 3 (22) is fixedly connected to the end of the shaft 1 (21). A receiving plate (20) and a scraper (26) are respectively provided on both sides of the magnetic suction roller (23). Both the receiving plate (20) and the scraper (26) are fixedly connected to the inside of the feeding trough (13). Two crushing rollers (16) are rotatably connected to the top of the housing (12). A drive motor (15) is fixedly connected to the outer wall of the housing (12). The output shaft of the drive motor (15) is fixedly connected to one of the crushing rollers (16). A feed guide plate (17) is provided below the crushing roller (16). The feed guide plate (17) is fixedly connected to the housing (12).

2. The foundry sand regeneration device for casting production according to claim 1, characterized in that: The ends of the two crushing rollers (16) away from the drive motor (15) are fixed with crushing gears (32) through a set shaft. The two crushing gears (32) mesh with each other. One side of one of the crushing gears (32) is fixed with a small transmission gear (6) through a set shaft. One end of the transmission shaft (33) is fixed with a large transmission gear (9). The outer walls of the large transmission gear (9) and the small transmission gear (6) are fitted with a transmission chain (7).

3. The foundry sand regeneration device for casting production according to claim 2, characterized in that: Another crushing gear (32) has a transmission gear two (10) fixed to one side by a shaft. The outer walls of the transmission gear two (10) and the transmission gear three (22) are fitted with a transmission chain two (8).

4. The foundry sand regeneration device for casting production according to claim 3, characterized in that: A flow channel (25) is provided above the scraper (26), and a collection channel (24) is fixedly connected to one side of the feeding channel (13). The flow channel (25) and the collection channel (24) are connected.

5. The foundry sand regeneration device for casting production according to claim 4, characterized in that: The outer wall of the shell (12) is fixed with a discharge trough (14), which is connected to the shell (12) through a discharge port (34). A guide pipe (11) is connected to one side of the discharge trough (14).

6. The foundry sand regeneration device for casting production according to claim 5, characterized in that: The top of the base (3) is fixed with a feeding rack (2), and the feeding rack (2) is equipped with a lifting mechanism (4).

7. A foundry sand regeneration device for casting production according to claim 6, characterized in that: The base frame (1) is rotatably connected to a dehydration mesh belt (5), and a dehydration chamber (35) is provided below the dehydration mesh belt (5). A hot air mechanism is provided inside the dehydration chamber (35).

8. A process for recycling foundry sand used in casting production, characterized in that: The application of the foundry sand regeneration device for casting production as described in claim 7 includes the following steps: S1. The old sand is vertically transported to the crushing station by the lifting mechanism (4); S2. Two opposing rotating crushing rollers (16) are used to crush the old sand by squeezing. S3. The crushed sand particles fall onto the screening plate (29) and are shaken and screened through the corrugated groove (28); S4. Qualified sand particles undergo two-stage magnetic separation. The sand particles are initially separated by magnetic roller (23). After the initial separation, the sand particles slide down along the receiving plate (20) and are separated a second time by the second magnetic roller (23) in a reverse impact manner. S5. The scraper (26) automatically removes magnetic impurities adsorbed on the surface of the magnetic roller (23); S6. The magnetically separated sand particles are evenly distributed on the dewatering mesh belt (5) and dried by hot air circulation. S7. Substandard sand particles are automatically returned to the lifting mechanism (4) through the guide pipe (11).

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