Bidirectional spiral sand feeding device for sand mold printer with uniform feeding function

Abstract

The invention discloses a uniform feeding bidirectional spiral sand feeding device for a sand mold printer, the uniform feeding bidirectional spiral sand feeding device comprises a machine shell, a rack and two fixing plates are arranged in the machine shell, the rack is mounted in the machine shell through the two fixing plates, and a sand feeding assembly is arranged above the rack. In the sand feeding process, the sand feeding motor drives the two-way spiral conveying rod to rotate, the two spiral pieces on the two-way spiral conveying rod feed sand, and the sand can be evenly fed to all positions of the sand feeding box. The two spiral pieces in the opposite directions conduct synchronous feeding towards the two sides, then sand materials can be evenly conveyed, the problem that the sand materials are not evenly distributed in the edge area is avoided, the consistency and high precision of sand mold printing pieces are guaranteed, and therefore the overall production efficiency and product quality are improved.

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 most extensive and mature application of 3DP (Three Dimensional Printing) technology, the application field of 3DP printing technology in casting sand molds is becoming more and more extensive. Casting sand mold 3D printing has natural advantages in sample research and development, complex parts molding, multi-variety small batch and other applications. Binder jet molding (3DP) sand printer selectively prints casting resin in the form of droplets onto layers of specially required breathable casting sand through a nozzle, and generates casting or artistic sand molds by stacking layers. This additive process uses three-dimensional digital models to directly produce complex sand molds and sand cores, without the need for traditional mold making and then making sand molds.

[0003] In the sand feeding process, existing sand printers often use a spiral sand feeding mechanism to transport sand from the hopper to the work platform by rotating the spiral blades. This mechanism plays a key role in the sand printing process. However, when the sand feeding mechanism is large in size, the spiral blades often cannot effectively transport the sand to the edge of the work platform, resulting in uneven distribution of sand in the edge area, affecting the printing quality; When the spiral sand feeding mechanism is working, the sand in the hopper of the sand mold machine is first fed into the sand storage box. The sand storage box ensures that the sand can enter the sand feeding mechanism smoothly and orderly to realize the 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 to work, the sand 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 on the printing platform will become uneven, affecting the quality of the sand mold. Moreover, too much sand fed will increase the friction between the spiral blades and the sand, thereby accelerating the wear of the spiral blades. For this reason, a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding is proposed. Summary of the invention

[0004] 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-mentioned background technology.

[0005] The present invention is implemented by the following technical scheme: a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding, comprising a housing, a frame and two fixing plates are arranged inside the housing, the frame is installed inside the housing through the two fixing plates, and a sand feeding assembly is arranged above the frame; The sand delivery assembly includes a sand delivery box, a cover plate, a guide hopper, a buffer box, a sand delivery motor, a bidirectional spiral delivery rod and two unloading plates; 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 with the sand feeding box, the outer wall of the bidirectional spiral conveying rod is attached to the inner 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 unloading plates are symmetrically rotatably connected to the two sides of the inner wall of the cache box, the outer wall of the unloading plate is attached to the inner wall of the cache box, and a unloading head is installed on the lower surface of the sand feeding box.

[0006] As a further preferred embodiment of the present technical solution: the sand delivery 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; 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.

[0007] 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.

[0008] 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.

[0009] As a further preferred embodiment of the present technical solution: one end of the spring bears against the cache box, and the other end of the spring bears against the contact plate.

[0010] As a further preferred embodiment of the technical solution: the lifting seat is internally symmetrically slidably connected with two guide rods, 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.

[0011] As a further preferred embodiment of the technical solution: a driving assembly is installed outside the frame, and the driving assembly includes two driving motors, a screw rod, two sliding seats and a driving plate; 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.

[0012] As a further preferred embodiment of the present technical solution: the two driving motors are symmetrically installed 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 installed on the upper surfaces of the two sliding seats.

[0013] As a further preferred embodiment of the 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.

[0014] As a further preferred embodiment of the 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.

[0015] Advantages of the present invention: 1. In the process of feeding sand, the sand feeding motor drives the bidirectional spiral conveying rod to rotate, and the two spiral pieces on the bidirectional spiral conveying rod feed the sand material, so that the sand material can be evenly fed 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 pieces in opposite directions feed the sand material synchronously toward both sides, so that the sand material can be evenly fed, 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; 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 unloading plate rotate, so that the angle between the unloading plate and the buffer box can be increased at this time. Through the cooperation of the two unloading plates, the bottom opening of the buffer 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 buffer box is enlarged, and the amount of sand flowing into the sand feeding box is increased. By adjusting the angle of the unloading 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

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0017] Figure 1 It is a structural schematic diagram of a bidirectional spiral sand feeding device for a sand mold printer with uniform feeding according to the present invention; Figure 2 This is a schematic diagram of the installation position of the sand delivery assembly of the present invention; Figure 3 It is a schematic diagram of the structure of the driving assembly of the present invention; Figure 4 It is a structural schematic diagram of the sand conveying assembly of the present invention; Figure 5 It is a schematic diagram of the structure decomposition of the sand conveying component of the present invention; Figure 6 It is a schematic diagram of the installation position of the blanking plate of the present invention; Figure 7 It is a schematic diagram of the structure of the push seat of the present invention; Figure 8 It is a schematic diagram of the guide rail structure of the present invention.

[0018] In the figure: 11, casing; 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, lead screw; 23, sliding seat; 24, drive plate; 301, sand delivery assembly; 31, sand delivery box; 32, cover plate; 33, guide hopper; 34, buffer box; 35, sand delivery motor; 36, two-way spiral conveying rod; 37, unloading head; 38, unloading 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

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] Example In the sand feeding process, existing sand printers often use a spiral sand feeding mechanism to transport sand from the hopper to the work platform by rotating the spiral blades. This mechanism plays a key role in the sand printing process. However, when the sand feeding mechanism is large in size, the spiral blades often cannot effectively transport the sand to the edge of the work platform, resulting in uneven distribution of sand in the edge area, affecting the printing quality; 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 are arranged inside the housing 11, the frame 15 is installed inside the housing 11 through the two fixing plates 17, and a frame structure can be formed by the cooperation of the frame 15 and the fixing plates 17, thereby enhancing the stability of the overall structure; In this embodiment, specifically: a sand feeding assembly 301 is arranged above the frame 15, and 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 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; 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. When sand printing is performed, the printing platform 13 is moved to the inside of the housing 11 through the conveying 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; The sand delivery assembly 301 includes 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 unloading plates 38; The cover plate 32 is installed on the upper surface of the sand feeding box 31, the guide hopper 33 is installed on the upper surface of the buffer box 34, the buffer box 34 is installed on the upper surface of the cover plate 32 and is connected with the sand feeding box 31, the sand feeding box 31 can be closed by the cover plate 32, the sand material in the printer hopper 12 can be introduced into the buffer box 34 by the guide hopper 33, and the buffer box 34 is used to buffer a certain amount of sand material, so as to balance the flow of sand material, and ensure that the sand feeding mechanism obtains a continuous and stable supply of sand material during the sand laying process; 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 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, and a feeding head 37 is installed on the lower surface of the sand feeding box 31. During the sand feeding process, the sand 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, and the two spiral plates on the bidirectional spiral conveying rod 36 feed the sand, and the sand is evenly delivered to various positions of the sand feeding box 31; Two linear modules 16 are installed on the upper surface of the frame 15, and a driving 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 driving frame 20. After the sand material is laid on the printing platform 13, the driving frame 20 is driven to move by the linear module 16, and the print head 19 is driven to move by the driving frame 20. The print head 19 sprays a binder to a specific position of the sand layer through a nozzle, so that the sand is solidified under the action of the binder to form a sand layer with a specific shape, thereby realizing the sand mold printing operation.

[0021] 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 mold printer with uniform feeding, and the problem is solved through the above technical solution: In the sand feeding process of the present invention, the two-way spiral conveying rod 36 is driven to rotate by the sand feeding motor 35, and the two spiral pieces on the two-way spiral conveying rod 36 feed the sand material, so that the sand material can be evenly fed to various positions of the sand feeding box 31. The present invention adopts a two-way spiral conveying rod 36 with a two-way 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 fed, 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] 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 on the printing platform will become uneven, affecting the quality of the sand mold. In addition, too large an amount of sand fed will increase the friction between the spiral blade and the sand, thereby accelerating the wear of the spiral blade. To do this, see Figure 2-Figure 8 The sand delivery assembly 301 further includes a mounting plate 39, an adjustment motor 40, a lifting seat 42, a threaded rod 43, a push seat 44, a guide rail 45, a slider 46, a sliding rod 47, a spring 48 and a contact plate 49; 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. The adjusting 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 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 adjusting motor 40, and the pushing seat 44 is fixedly connected to one side of the lifting seat 42; 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 pushing seat 44, the contact plate 49, the sliding rod 47, the slider 46 and other mechanisms are linked, so that the inclination angle of the blanking plate 38 can be flexibly adjusted; By adjusting the angle of the feed 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.

[0023] 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 buffer box 34, one side of the contact plate 49 is attached to one side of the pushing seat 44, and the contact plate 49 and the pushing seat 44 are both inclined surfaces. When the adjusting motor 40 rotates clockwise, the pushing seat 44 moves upward, and the pushing 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 unloading plate 38 to rotate, and then the angle between the unloading plate 38 and the buffer box 34 can be increased at this time. Through the cooperation of the two unloading 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, thereby realizing the adjustment of the sand feeding amount.

[0024] 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 unloading plate 38 through the guide rail 45. The angle between the unloading plate 38 and the cache box 34 is reduced. With the cooperation of the two unloading 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.

[0025] 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.

[0026] 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 mold printer with uniform feeding, and the problem is solved through the above technical solution: 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 unloading plate 38, so that the angle between the unloading plate 38 and the buffer box 34 can be increased at this time. Through the cooperation of the two unloading 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, and under the push of the spring 48, the contact plate 49 keeps in contact with the lifting seat 42, the bottom opening of the buffer box 34 is enlarged, and the amount of sand flowing into the sand feeding box 31 is increased. By adjusting the angle of the unloading 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.

[0027] In this embodiment, specifically: a driving assembly 201 is installed outside the frame 15, and the driving assembly 201 is used to adjust the position of the sand delivery assembly 301, so that the sand delivery assembly 301 can completely cover the printing platform 13 during the movement process, and the sand material is laid on the surface of the printing platform 13; The driving assembly 201 includes two driving motors 21, a screw rod 22, two sliding seats 23 and a driving plate 24; The driving plate 24 is fixedly connected to the sliding seat 23, and the driving plate 24 is threadedly connected to the outer side 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 side 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, so that the position adjustment of the sand feeding assembly 301 can be realized.

[0028] In this embodiment, specifically: a sensor for monitoring the angle of the blanking plate 38 is arranged 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. An angle control algorithm is arranged inside the controller, and according to the angle control algorithm, precise control of the opening and closing angle of the blanking plate 38 can be achieved; The angle control algorithm includes the following steps: Sensor calibration: At the beginning of the control system startup, the sensor set inside the buffer box 34 needs to be calibrated first to ensure that the sensor can accurately measure the actual angle of the blanking plate 38; 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 signals based on angle deviation and preset PID control algorithm; Motor drive: The control signal is sent to the adjustment motor 40 to drive the threaded rod 43 to rotate, and then drive the lifting seat 42, the pushing seat 44 and other structures 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.

[0029] The working principle or structural principle is that when in use, the printing platform 13 is moved to the inside of the housing 11 through the conveying 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, and the sand 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, and the sand is evenly delivered to various positions of the sand feeding box 31, and finally laid on the printing platform 13 through the unloading head 37. The surface of the printing platform 13 is formed by the driving motor 21 driving 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, the sand feeding box 31 moves horizontally on the printing platform 13, and 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, the driving frame 20 drives the print head 19 to move, and 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; When performing sand printing, 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 unloading plate 38. At this time, the angle between the unloading plate 38 and the buffer box 34 is increased. With the cooperation of the two unloading 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. 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 buffer box 34 is increased, and the amount of sand flowing into the sand feeding box 31 is increased.

[0030] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional spiral sand feeding device for a sand printer with uniform feeding, characterized in that: It comprises a casing (11), wherein a frame (15) and two fixing plates (17) are arranged inside the casing (11), the frame (15) is installed inside the casing (11) via the two fixing plates (17), and a sand delivery assembly (301) is arranged 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 screw conveying rod (36) is in contact with 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 screw conveying rod (36) is fixedly connected to the output shaft of the sand feeding motor (35), the two unloading plates (38) are symmetrically rotatably connected to the two sides of the inner wall of the buffer box (34), the outer wall of the unloading plate (38) is in contact with the inner wall of the buffer box (34), and the lower surface of the sand feeding box (31) is provided with a unloading head (37).

2. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1 is characterized in that: The sand delivery assembly (301) further comprises 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) via a 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).

3. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 2 is 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).

4. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 2 is 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 affixed to one side of the push seat (44), and the affixed surfaces of the contact plate (49) and the push seat (44) are both inclined surfaces.

5. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 2 is 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).

6. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 2, 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).

7. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 1, characterized in that: A driving assembly (201) is installed outside the frame (15), and the driving assembly (201) comprises two driving motors (21), a screw rod (22), two sliding seats (23) and a driving 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).

8. The bidirectional spiral sand feeding device for a sand printer with uniform feeding according to claim 7, 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 another 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).

9. 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 drive 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 drive frame (20).

10. 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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