A bidirectional spiral sand feeding device for a sand printer with uniform feeding

Abstract

The present invention discloses a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding, comprising a housing, a frame and two fixed plates provided inside the housing, the frame being mounted inside the housing via the two fixed plates, and a sand feeding assembly being provided above the frame. In the sand feeding process, the present invention drives a bidirectional spiral conveying rod to rotate via a sand feeding motor, and two spiral blades on the bidirectional spiral conveying rod feed sand material, thereby uniformly feeding the sand material to various positions of a sand feeding box. The present invention adopts a bidirectional spiral conveying rod with a bidirectional spiral structure, and during feeding, two spiral blades in opposite directions synchronously feed material toward both sides, thereby enabling the sand material to be uniformly fed, thereby avoiding the problem of uneven distribution of sand material in the edge area, ensuring the consistency and high precision of sand mold prints, and thus improving the overall production efficiency and product quality.

Description

Technical Field

[0001] The invention relates to a sand feeding device, in particular to a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding, belonging to the technical field of sand mold printers. Background Art

[0002] 3D printing technology is an innovation towards a new digital production method. With the widespread and mature application of 3DP (Three Dimensional Printing) technology, 3DP printing technology is increasingly being applied in foundry sand molds. 3D printing of foundry sand molds has a natural advantage in applications such as sample development, complex part molding, and small batch production of multiple varieties. Binder jet molding (3DP) sand printers use a nozzle to selectively print casting resin in the form of droplets onto layers of specially required breathable foundry sand. These layers are stacked to create sand molds for casting or artistic purposes. This additive process directly produces complex sand molds and sand cores using three-dimensional digital models, eliminating the need for traditional mold making and then sand molding.

[0003] Existing sand printers often use a spiral sand feeding mechanism to transport sand material during the sand feeding process. The spiral sand feeding mechanism uses the rotation of spiral blades to effectively transport sand material from the hopper to the work platform. This mechanism plays a key role in the sand printing process. However, when the sand feeding mechanism is large, the spiral blades often cannot effectively transport the sand material to the edge of the work platform, resulting in uneven sand material distribution in the edge areas, affecting printing quality.

[0004] When the spiral sand feeding mechanism is working, the sand material in the sand mold machine hopper is first fed into the sand storage box, which ensures that the sand material can enter the sand feeding mechanism smoothly and orderly through the sand storage box, thereby realizing sand supply to the sand feeding mechanism. The sand storage box and the sand feeding mechanism are often connected. When the sand feeding mechanism starts working, the sand material in the sand storage box enters the sand feeding mechanism. In the prior art, it is impossible to adjust the amount of sand entering the sand feeding mechanism according to the working conditions. When the amount of sand fed is too large, the distribution of the sand material on the printing platform will become uneven, affecting the quality of the sand mold. Moreover, excessive amount of sand fed will increase the friction between the spiral blades and the sand material, thereby accelerating the wear of the spiral blades. For this reason, a bidirectional spiral sand feeding device with uniform feeding for a sand mold printer is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding, so as to solve one of the problems raised in the above background technology.

[0006] The present invention is implemented by the following technical solution: a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding, comprising a housing, a frame and two fixing plates provided inside the housing, the frame being mounted inside the housing via the two fixing plates, and a sand feeding assembly being provided above the frame;

[0007] The sand feeding assembly includes a sand feeding box, a cover plate, a guide hopper, a buffer box, a sand feeding motor, a bidirectional spiral feeding rod and two discharge plates;

[0008] The cover plate is installed on the upper surface of the sand feeding box, the guide hopper is installed on the upper surface of the cache box, the cache box is installed on the upper surface of the cover plate and is connected to the sand feeding box, the outer side wall of the bidirectional spiral conveying rod is fitted with the inner side wall of the cache box, the sand feeding motor is installed on one side of the sand feeding box, one end of the bidirectional spiral conveying rod is fixedly connected to the output shaft of the sand feeding motor, the two blanking plates are symmetrically connected to the two sides of the inner wall of the cache box, the outer side wall of the blanking plate is fitted with the inner side wall of the cache box, and the lower surface of the sand feeding box is provided with a blanking head.

[0009] As a further preferred embodiment of the present technical solution: the sand feeding assembly further includes a mounting plate, an adjusting motor, a lifting seat, a threaded rod, a pushing seat, a guide rail, a slider, a sliding rod, a spring and a contact plate;

[0010] The adjusting motor is installed on the outer wall of the cache box through the mounting plate, the lifting seat is threadedly connected to the outer wall of the threaded rod, the pushing seat is fixedly connected to one side of the lifting seat, the guide rail is fixedly connected to one side of the blanking plate, the slider is rotatably connected to one end of the sliding rod, the other end of the sliding rod is fixedly connected to one side of the contact plate, and the spring is sleeved on the outer wall of the sliding rod.

[0011] As a further preferred embodiment of the present technical solution: the bottom end of the threaded rod is rotatably connected to the upper surface of the cover plate, and the top end of the threaded rod is fixedly connected to the output shaft of the regulating motor.

[0012] As a further preferred embodiment of the present technical solution: the outer wall of the slider is slidably connected to the inner wall of the guide rail, the sliding rod is slidably connected to the inside of the cache box, one side of the contact plate is affixed to one side of the push seat, and the affixed surfaces of the contact plate and the push seat are both inclined surfaces.

[0013] As a further preferred embodiment of the present technical solution: one end of the spring presses against the cache box, and the other end of the spring presses against the contact plate.

[0014] As a further preferred embodiment of the present technical solution, two guide rods are symmetrically and slidably connected inside the lifting seat, the top ends of the guide rods are fixedly connected to the lower surface of the mounting plate, and the bottom ends of the guide rods are fixedly connected to the upper surface of the cover plate.

[0015] As a further preferred embodiment of the present technical solution: a driving assembly is installed on the outside of the frame, and the driving assembly includes two driving motors, a screw rod, two sliding seats and a driving plate;

[0016] The driving plate is fixedly connected to the sliding seat, the driving plate is threadedly connected to the outer side wall of the screw rod, and one end of the screw rod is fixedly connected to the driving motor.

[0017] As a further preferred embodiment of the present technical solution: the two driving motors are symmetrically mounted on the rear surface of a fixed plate, the other end of the screw rod is rotatably connected to the rear surface of another fixed plate, the two sliding seats are symmetrically slidably connected to the outer side walls of the frame, and the sand feeding box is mounted on the upper surfaces of the two sliding seats.

[0018] As a further preferred embodiment of the present technical solution: two linear modules are installed on the upper surface of the frame, a driving frame is commonly installed on the movers of the two linear modules, and a print head is installed on the outer side wall of the driving frame.

[0019] As a further preferred embodiment of the present technical solution: a conveying platform is installed at the bottom of the housing, a printing platform is installed on the upper surface of the conveying platform, and a printer hopper is installed on the upper surface of the housing.

[0020] Advantages of the present invention:

[0021] 1. During the sand feeding process, the present invention drives the bidirectional spiral conveying rod to rotate through the sand feeding motor, and the two spiral blades on the bidirectional spiral conveying rod feed the sand material, so that the sand material can be evenly delivered to various positions of the sand feeding box. The present invention adopts a bidirectional spiral conveying rod with a bidirectional spiral structure. When feeding, the two spiral blades in opposite directions feed the sand material synchronously to both sides, so that the sand material can be evenly transported, avoiding the problem of uneven distribution of sand material in the edge area, ensuring the consistency and high precision of the sand mold prints, thereby improving the overall production efficiency and product quality;

[0022] 2. The present invention drives the threaded rod to rotate clockwise by adjusting the motor, and the threaded rod drives the lifting seat to move upward through the thread, and the lifting seat is linked to the pushing seat, contact plate, sliding rod, slider and other structures to make the blanking plate rotate, and then the angle between the blanking plate and the cache box can be increased at this time. Through the cooperation of the two blanking plates, the bottom opening of the cache box is reduced, and the amount of sand flowing into the sand feeding box is reduced. Conversely, when the adjusting motor rotates counterclockwise, the lifting seat moves downward, and under the push of the spring, the contact plate remains in contact with the lifting seat, the bottom opening of the cache box is increased, and the amount of sand flowing into the sand feeding box is increased. By adjusting the angle of the blanking plate, the problem of uneven distribution of sand on the printing platform caused by excessive sand can be effectively prevented, thereby ensuring the accuracy and quality of the printing operation. Moreover, reasonable sand amount adjustment can also significantly reduce unnecessary wear on the bidirectional spiral conveying rod, extend its service life, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of a bidirectional spiral sand feeding device for a sand printer with uniform feeding according to the present invention;

[0025] Figure 2 This is a schematic diagram of the installation position of the sand delivery assembly of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the drive assembly of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the sand delivery assembly of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the sand delivery component of the present invention;

[0029] Figure 6 This is a schematic diagram of the installation position of the blanking plate of the present invention;

[0030] Figure 7 This is a schematic diagram of the push seat structure of the present invention;

[0031] Figure 8 Schematic diagram of the guide rail structure of the present invention.

[0032] In the figure: 11. Housing; 12. Printer hopper; 13. Printing platform; 14. Conveyor platform; 15. Frame; 16. Linear module; 17. Fixed plate; 19. Print head; 20. Drive frame; 201. Drive assembly; 21. Drive motor; 22. Screw; 23. Sliding seat; 24. Drive plate; 301. Sand feeding assembly; 31. Sand feeding box; 32. Cover plate; 33. Guide hopper; 34. Buffer box; 35. Sand feeding motor; 36. Bidirectional spiral conveyor rod; 37. Discharge head; 38. Discharge plate; 39. Mounting plate; 40. Adjustment motor; 41. Guide rod; 42. Lifting seat; 43. Threaded rod; 44. Push seat; 45. Guide rail; 46. Slider; 47. Sliding rod; 48. Spring; 49. Contact plate. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example

[0035] Existing sand printers often use a spiral sand feeding mechanism to transport sand material during the sand feeding process. The spiral sand feeding mechanism uses the rotation of spiral blades to effectively transport sand material from the hopper to the work platform. This mechanism plays a key role in the sand printing process. However, when the sand feeding mechanism is large, the spiral blades often cannot effectively transport the sand material to the edge of the work platform, resulting in uneven sand material distribution in the edge areas, affecting printing quality.

[0036] To do this, see Figure 1-Figure 5 The present invention provides a technical solution: a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding, comprising a housing 11, a frame 15 and two fixing plates 17 disposed inside the housing 11, the frame 15 being mounted inside the housing 11 via the two fixing plates 17, and a frame structure formed by the cooperation of the frame 15 and the fixing plates 17, thereby enhancing the stability of the overall structure;

[0037] In this embodiment, specifically: a sand feeding assembly 301 is provided above the frame 15. The sand feeding assembly 301 is used to ensure uniform conveying of sand material. It adopts a bidirectional spiral feeding structure. When feeding, two spiral pieces in opposite directions are located in the middle of the sand feeding box 31 and feed the sand material synchronously to both sides. In this way, the sand material can be efficiently and evenly guided to various positions of the sand feeding box 31, effectively avoiding the problem of uneven distribution of sand material in the edge area, ensuring the consistency and high precision of the sand mold prints, thereby improving the overall production efficiency and product quality.

[0038] A conveyor platform 14 is installed at the bottom of the housing 11, and a printing platform 13 is installed on the upper surface of the conveyor platform 14. A printer hopper 12 is installed on the upper surface of the housing 11. When sand printing is performed, the printing platform 13 is moved to the interior of the housing 11 by the conveyor platform 14 so that the position of the printing platform 13 corresponds to the position of the print head 19 and the sand feeding box 31;

[0039] The sand feeding assembly 301 includes a sand feeding box 31, a cover plate 32, a guide hopper 33, a buffer box 34, a sand feeding motor 35, a bidirectional screw conveying rod 36 and two blanking plates 38;

[0040] The cover plate 32 is mounted on the upper surface of the sand feeding box 31, and the guide hopper 33 is mounted on the upper surface of the buffer box 34. The buffer box 34 is mounted on the upper surface of the cover plate 32 and is connected to the sand feeding box 31. The cover plate 32 can be used to close the sand feeding box 31, and the guide hopper 33 can be used to guide the sand in the printer hopper 12 into the buffer box 34. The buffer box 34 is used to buffer a certain amount of sand, thereby balancing the flow of sand. During the sand laying process, it can ensure that the sand feeding mechanism obtains a continuous and stable supply of sand.

[0041] The outer wall of the bidirectional spiral conveying rod 36 is fitted to the inner wall of the buffer box 34. The sand feeding motor 35 is installed on one side of the sand feeding box 31. One end of the bidirectional spiral conveying rod 36 is fixedly connected to the output shaft of the sand feeding motor 35. A discharge head 37 is installed on the lower surface of the sand feeding box 31. During the sand feeding process, the sand material in the sand printer hopper 12 flows into the buffer box 34, and then flows into the sand feeding box 31 through the buffer box 34. The bidirectional spiral conveying rod 36 is driven to rotate by the sand feeding motor 35. The two spiral plates on the bidirectional spiral conveying rod 36 feed the sand material, and the sand material is evenly delivered to various positions of the sand feeding box 31.

[0042] Two linear modules 16 are installed on the upper surface of the frame 15. A drive frame 20 is commonly installed on the movers of the two linear modules 16. A print head 19 is installed on the outer wall of the drive frame 20. After the sand material is laid on the printing platform 13, the drive frame 20 is driven to move by the linear module 16, and the print head 19 is driven to move by the drive frame 20. The print head 19 sprays a binder to a specific position of the sand layer through a nozzle, so that the sand solidifies under the action of the binder to form a layer of sand with a specific shape, thereby realizing the sand mold printing operation.

[0043] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a bidirectional spiral sand feeding device for a sand printer with uniform feeding, and solves the problems through the above technical solutions:

[0044] During the sand feeding process of the present invention, the sand feeding motor 35 drives the bidirectional spiral conveying rod 36 to rotate, and the two spiral pieces on the bidirectional spiral conveying rod 36 feed the sand material, so that the sand material can be evenly delivered to various positions of the sand feeding box 31. The present invention adopts a bidirectional spiral conveying rod 36 with a bidirectional spiral structure. When feeding, the two spiral pieces in opposite directions feed the sand material synchronously toward both sides, so that the sand material can be evenly transported, avoiding the problem of uneven distribution of sand material in the edge area, ensuring the consistency and high precision of the sand mold prints, thereby improving the overall production efficiency and product quality.

[0045] In the existing technology, it is impossible to adjust the amount of sand entering the sand feeding mechanism according to the working conditions. When the amount of sand fed is too large, the distribution of the sand material on the printing platform will become uneven, affecting the quality of the sand mold. In addition, excessive sand feeding will increase the friction between the spiral blades and the sand material, thereby accelerating the wear of the spiral blades.

[0046] To do this, see Figure 2-Figure 8 The sand feeding assembly 301 further includes a mounting plate 39, an adjusting motor 40, a lifting seat 42, a threaded rod 43, a pushing seat 44, a guide rail 45, a slider 46, a sliding rod 47, a spring 48 and a contact plate 49;

[0047] The two blanking plates 38 are symmetrically connected to the inner walls of the buffer box 34, and the outer walls of the blanking plates 38 are attached to the inner walls of the buffer box 34.

[0048] The adjustment motor 40 is mounted on the outer wall of the buffer box 34 via the mounting plate 39. The lifting seat 42 is threadedly connected to the outer wall of the threaded rod 43. The bottom end of the threaded rod 43 is rotatably connected to the upper surface of the cover plate 32. The top end of the threaded rod 43 is fixedly connected to the output shaft of the adjustment motor 40. The pushing seat 44 is fixedly connected to one side of the lifting seat 42.

[0049] By adjusting the motor 40 to drive the threaded rod 43 to rotate, the threaded rod 43 drives the lifting seat 42 to move in the vertical direction through the thread, and the lifting seat 42 drives the pushing seat 44. Through the linkage of the pushing seat 44 with the contact plate 49, the sliding rod 47, the slider 46 and other mechanisms, the inclination angle of the blanking plate 38 can be flexibly adjusted;

[0050] By adjusting the angle of the blanking plate 38, the problem of uneven distribution of sand on the printing platform 13 caused by excessive sand can be effectively prevented, thereby ensuring the accuracy and quality of the 3D printing operation. Moreover, reasonable sand amount adjustment can also significantly reduce unnecessary wear on the bidirectional spiral conveying rod 36, extend its service life, and reduce maintenance costs.

[0051] In this embodiment, specifically: the guide rail 45 is fixedly connected to one side of the blanking plate 38, the slider 46 is rotatably connected to one end of the sliding rod 47, the other end of the sliding rod 47 is fixedly connected to one side of the contact plate 49, the spring 48 is sleeved on the outer wall of the sliding rod 47, the outer wall of the slider 46 is slidably connected to the inner wall of the guide rail 45, the sliding rod 47 is slidably connected to the inside of the cache box 34, one side of the contact plate 49 is attached to one side of the push seat 44, and the contact plate 49 and the push seat 44 are both inclined surfaces. When the adjustment motor 40 rotates clockwise, the push seat 44 moves upward, and the push seat 44 contacts the contact plate 49 through the inclined surface. The contact plate 49 slides through the sliding rod 47, and the sliding rod 47 pushes the slider 46 to slide in the guide rail 45. The guide rail 45 drives the blanking plate 38 to rotate, and then the angle between the blanking plate 38 and the cache box 34 can be increased at this time. Through the cooperation of the two blanking plates 38, the bottom opening of the cache box 34 is reduced, and the amount of sand flowing into the sand feeding box 31 is reduced, thereby realizing the adjustment of the sand feeding amount.

[0052] In this embodiment, specifically: one end of the spring 48 presses against the cache box 34, and the other end of the spring 48 presses against the contact plate 49. When the adjusting motor 40 rotates counterclockwise, the lifting seat 42 moves downward. At this time, under the push of the spring 48, the contact plate 49 remains in contact with the lifting seat 42, and the contact plate 49 moves away from the cache box 34. The contact plate 49 drives the slider 46 through the sliding rod 47, and the slider 46 drives the blanking plate 38 through the guide rail 45. The angle between the blanking plate 38 and the cache box 34 is reduced. With the cooperation of the two blanking plates 38, the bottom opening of the cache box 34 is enlarged, and the amount of sand flowing into the sand feeding box 31 is increased.

[0053] In this embodiment, specifically: the lifting seat 42 is symmetrically and slidably connected to two guide rods 41 inside, the top end of the guide rod 41 is fixedly connected to the lower surface of the mounting plate 39, and the bottom end of the guide rod 41 is fixedly connected to the upper surface of the cover plate 32. The guide rod 41 can increase the stability of the lifting seat 42. When the threaded rod 43 drives the lifting seat 42 to move, the lifting seat 42 always moves along the guide rod 41.

[0054] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a bidirectional spiral sand feeding device for a sand printer with uniform feeding, and solves the problems through the above technical solutions:

[0055] The present invention drives the threaded rod 43 to rotate clockwise by adjusting the motor 40, and the threaded rod 43 drives the lifting seat 42 to move upward through the thread. The lifting seat 42 is linked to the push seat 44, the contact plate 49, the sliding rod 47, the slider 46 and other structures to rotate the blanking plate 38, thereby increasing the angle between the blanking plate 38 and the buffer box 34. Through the cooperation of the two blanking plates 38, the bottom opening of the buffer box 34 is reduced, and the amount of sand flowing into the sand feeding box 31 is reduced. On the contrary, when the adjusting motor 40 rotates counterclockwise, the lifting seat 4 2 moves downward. Under the push of the spring 48, the contact plate 49 remains in contact with the lifting seat 42, the bottom opening of the buffer box 34 increases, and the amount of sand flowing into the sand feeding box 31 increases. By adjusting the angle of the discharge plate 38, the problem of uneven distribution of sand on the printing platform 13 caused by excessive sand can be effectively prevented, thereby ensuring the accuracy and quality of the 3D printing operation. Moreover, reasonable sand amount adjustment can significantly reduce unnecessary wear on the bidirectional spiral conveying rod 36, extend its service life, and reduce maintenance costs.

[0056] In this embodiment, specifically: a driving assembly 201 is installed on the outside of the frame 15, and the driving assembly 201 is used to adjust the position of the sand feeding assembly 301 so that the sand feeding assembly 301 can completely cover the printing platform 13 during the movement process, and lay the sand material on the surface of the printing platform 13;

[0057] The drive assembly 201 includes two drive motors 21, a screw rod 22, two sliding seats 23 and a drive plate 24;

[0058] The driving plate 24 is fixedly connected to the sliding seat 23, and the driving plate 24 is threadedly connected to the outer wall of the screw rod 22. One end of the screw rod 22 is fixedly connected to the driving motor 21. The two driving motors 21 are symmetrically installed on the rear surface of a fixed plate 17. The other end of the screw rod 22 is rotatably connected to the rear surface of the other fixed plate 17. The two sliding seats 23 are symmetrically slidably connected to the outer wall of the frame 15. The sand feeding box 31 is installed on the upper surface of the two sliding seats 23. The screw rod 22 is driven to rotate by the driving motor 21. The screw rod 22 drives the driving plate 24 through the thread. The driving plate 24 drives the sliding seat 23, and the sliding seat 23 drives the sand feeding box 31, thereby realizing the position adjustment of the sand feeding assembly 301.

[0059] In this embodiment, specifically: a sensor for monitoring the angle of the blanking plate 38 is provided inside the buffer box 34, and the sensor is connected to an external controller to achieve real-time monitoring of the angle of the blanking plate 38. The controller is internally provided with an angle control algorithm, and according to the angle control algorithm, the opening and closing angle of the blanking plate 38 can be precisely controlled;

[0060] The angle control algorithm includes the following steps:

[0061] Sensor calibration: When the control system is initially started, the sensor inside the buffer box 34 needs to be calibrated to ensure that the sensor can accurately measure the actual angle of the blanking plate 38;

[0062] Setting the target angle: According to the requirements of the printing task, the target angle of the blanking plate 38 is set through the control system;

[0063] Real-time angle monitoring: The sensor continuously monitors the current angle of the blanking plate 38 and transmits the data to the control system in real time;

[0064] Data preprocessing: The control system preprocesses the received angle data, including filtering and denoising, to improve the accuracy and reliability of the data;

[0065] Angle deviation calculation: The control system calculates the deviation between the current angle and the target angle;

[0066] Control signal generation: Generate corresponding control signal based on angle deviation and preset PID control algorithm;

[0067] Motor drive: The control signal is sent to the adjustment motor 40, which drives the threaded rod 43 to rotate, and then drives the lifting seat 42, the pushing seat 44 and other structures through the thread to adjust the angle of the blanking plate 38;

[0068] Feedback adjustment: During the adjustment process, the sensor continuously monitors the angle changes of the blanking plate 38 and feeds back the new angle data to the control system for further adjustment and optimization.

[0069] Working principle or structural principle, when in use, the printing platform 13 is moved to the inside of the casing 11 through the conveying table 14, so that the position of the printing platform 13 corresponds to the position of the print head 19 and the sand feeding box 31, and the sand material in the printer hopper 12 is introduced into the buffer box 34 through the guide hopper 33, and then flows into the sand feeding box 31 through the buffer box 34, and the bidirectional spiral conveying rod 36 is driven to rotate by the sand feeding motor 35. The two spiral plates on the bidirectional spiral conveying rod 36 feed the sand material, and the sand material is evenly delivered to various positions of the sand feeding box 31, and finally laid on the printing platform 13 through the discharge head 37. The surface of the printing platform 13 is driven by the driving motor 21 to drive the screw rod 22 to rotate, the screw rod 22 drives the driving plate 24 through the thread, the driving plate 24 drives the sliding seat 23, the sliding seat 23 drives the sand feeding box 31, and the sand feeding box 31 moves horizontally on the printing platform 13. The sand material is evenly laid on the surface of the printing platform 13. At the same time, the linear module 16 drives the driving frame 20 to move, and the driving frame 20 drives the print head 19 to move. The print head 19 sprays the binder to a specific position of the sand layer through the nozzle, so that the sand material is solidified under the action of the binder to form a sand layer with a specific shape. Repeating the above actions can realize the sand mold printing operation;

[0070] When sand printing is performed, the amount of sand entering the sand feeding box 31 is adjusted according to the working conditions. The threaded rod 43 is driven to rotate clockwise by the adjusting motor 40. The threaded rod 43 drives the lifting seat 42 to move upward through the thread. The lifting seat 42 is linked to the push seat 44, the contact plate 49, the sliding rod 47, the slider 46 and other structures to rotate the blanking plate 38. At this time, the angle between the blanking plate 38 and the cache box 34 is increased. With the cooperation of the two blanking plates 38, the bottom opening of the cache box 34 is reduced, and the amount of sand flowing into the sand feeding box 31 is reduced. Conversely, when the adjusting motor 40 rotates counterclockwise, the lifting seat 42 moves downward. Under the push of the spring 48, the contact plate 49 remains in contact with the lifting seat 42, the bottom opening of the cache box 34 is increased, and the amount of sand flowing into the sand feeding box 31 is increased.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bidirectional spiral sand feeding device for a sand printer with uniform feeding, characterized in that: The machine comprises a housing (11), wherein a frame (15) and two fixing plates (17) are provided inside the housing (11), the frame (15) is mounted inside the housing (11) via the two fixing plates (17), and a sand delivery assembly (301) is provided above the frame (15); The sand delivery assembly (301) comprises a sand delivery box (31), a cover plate (32), a guide hopper (33), a buffer box (34), a sand delivery motor (35), a bidirectional screw delivery rod (36) and two discharge plates (38); The cover plate (32) is mounted on the upper surface of the sand feeding box (31), the guide hopper (33) is mounted on the upper surface of the buffer box (34), the buffer box (34) is mounted on the upper surface of the cover plate (32) and is connected to the sand feeding box (31), the outer wall of the bidirectional spiral conveying rod (36) is attached to the inner wall of the buffer box (34), the sand feeding motor (35) is mounted on one side of the sand feeding box (31), one end of the bidirectional spiral conveying rod (36) is fixedly connected to the output shaft of the sand feeding motor (35), the two blanking plates (38) are symmetrically rotatably connected to the two sides of the inner wall of the buffer box (34), the outer wall of the blanking plate (38) is attached to the inner wall of the buffer box (34), and the lower surface of the sand feeding box (31) is equipped with a blanking head (37); The sand delivery assembly (301) further includes a mounting plate (39), an adjustment motor (40), a lifting seat (42), a threaded rod (43), a pushing seat (44), a guide rail (45), a slider (46), a sliding rod (47), a spring (48) and a contact plate (49); The regulating motor (40) is mounted on the outer wall of the buffer box (34) through the mounting plate (39), the lifting seat (42) is threadedly connected to the outer wall of the threaded rod (43), the pushing seat (44) is fixedly connected to one side of the lifting seat (42), the guide rail (45) is fixedly connected to one side of the blanking plate (38), the slider (46) is rotatably connected to one end of the sliding rod (47), the other end of the sliding rod (47) is fixedly connected to one side of the contact plate (49), and the spring (48) is sleeved on the outer wall of the sliding rod (47); A sensor for monitoring the angle of the blanking plate (38) is provided inside the cache box (34), the sensor being connected to an external controller, the controller being provided with an angle control algorithm, and the opening and closing angle of the blanking plate (38) is controlled according to the angle control algorithm; The angle control algorithm includes the following steps: Sensor calibration: First, the sensor provided inside the buffer box (34) is calibrated; Setting the target angle: according to the requirements of the printing task, the target angle of the blanking plate (38) is set by the control system; Real-time angle monitoring: The sensor continuously monitors the current angle of the blanking plate (38) and transmits the data to the control system in real time; Data preprocessing: The control system preprocesses the received angle data, including filtering and denoising, to improve the accuracy and reliability of the data; Angle deviation calculation: The control system calculates the deviation between the current angle and the target angle; Control signal generation: Generate corresponding control signal based on angle deviation and preset PID control algorithm; Motor drive: The control signal is sent to the regulating motor (40), driving the threaded rod (43) to rotate, and then driving the lifting seat (42) and the pushing seat (44) through the thread to adjust the angle of the blanking plate (38); Feedback adjustment: During the adjustment process, the sensor continuously monitors the angle change of the blanking plate (38) and feeds back the new angle data to the control system for further adjustment and optimization.

2. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: The bottom end of the threaded rod (43) is rotatably connected to the upper surface of the cover plate (32), and the top end of the threaded rod (43) is fixedly connected to the output shaft of the regulating motor (40).

3. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: The outer wall of the slider (46) is slidably connected to the inner wall of the guide rail (45), the sliding rod (47) is slidably connected to the inside of the buffer box (34), one side of the contact plate (49) is attached to one side of the push seat (44), and the contact surfaces of the contact plate (49) and the push seat (44) are both inclined surfaces.

4. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: One end of the spring (48) presses against the buffer box (34), and the other end of the spring (48) presses against the contact plate (49).

5. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: Two guide rods (41) are symmetrically and slidably connected inside the lifting seat (42), the top ends of the guide rods (41) are fixedly connected to the lower surface of the mounting plate (39), and the bottom ends of the guide rods (41) are fixedly connected to the upper surface of the cover plate (32).

6. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: A drive assembly (201) is installed outside the frame (15), and the drive assembly (201) includes two drive motors (21), a screw rod (22), two sliding seats (23) and a drive plate (24); The drive plate (24) is fixedly connected to the sliding seat (23), the drive plate (24) is threadedly connected to the outer wall of the screw rod (22), and one end of the screw rod (22) is fixedly connected to the drive motor (21).

7. A bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 6, characterized in that: The two driving motors (21) are symmetrically mounted on the rear surface of a fixed plate (17), the other end of the screw rod (22) is rotatably connected to the rear surface of the other fixed plate (17), the two sliding seats (23) are symmetrically slidably connected to the outer side wall of the frame (15), and the sand feeding box (31) is mounted on the upper surfaces of the two sliding seats (23).

8. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: Two linear modules (16) are mounted on the upper surface of the frame (15), a driving frame (20) is mounted on the movers of the two linear modules (16), and a print head (19) is mounted on the outer side wall of the driving frame (20).

9. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: A conveying platform (14) is installed at the bottom of the housing (11), a printing platform (13) is installed on the upper surface of the conveying platform (14), and a printer hopper (12) is installed on the upper surface of the housing (11).

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