Sand mold 3D printer for casting

Abstract

The invention belongs to the technical field of casting, and particularly relates to a casting sand mold 3D printer which comprises a printer body and a sand inlet cylinder arranged on the printer body, a first electric sliding table and a second electric sliding table are arranged in the printer body, the first electric sliding table is connected with a sand paving mechanism, and the second electric sliding table is connected with a second sand paving mechanism. The sand paving mechanism comprises a side plate and a transverse plate, and a sand shakeout assembly is arranged on the transverse plate; according to the sand mold 3D printer for casting, through a control assembly, a guide rail and a bearing seat in the lifting compaction mechanism, when the sand paving mechanism returns, a servo motor III drives a screw rod to rotate and drives a threaded sleeve and the bearing seat to slide upwards along the guide rail, so that a compaction roller is synchronously far away from a sand surface, and secondary rolling on a compacted sand mold during returning is effectively avoided; by means of reverse operation of the brush roller, gluing molding sand attached to the surface of the compaction roller can be efficiently brushed away, the brushed sand is guided by the L-shaped plate to fall into the waste collecting groove, it is guaranteed that the surface of the compaction roller is clean, and follow-up molding sand is prevented from being polluted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of casting, and particularly relates to a sand mold 3D printer for casting. BACKGROUND

[0002] The sand mold 3D printer is an industrial additive manufacturing device for the casting industry, which is capable of directly manufacturing sand molds or sand cores by means of binder jetting, selective laser sintering and other technologies to layer by layer bond molding materials such as quartz sand and ceramic sand. The sand mold 3D printer does not require the traditional mold manufacturing process, and can quickly realize the integrated molding of sand molds with complex cavities and special-shaped structures, greatly shortening the development and production cycle of castings, reducing the production cost of customized and small-batch castings, and being widely applied to the manufacturing of complex castings in the fields of automobiles, aerospace, engineering machinery and the like.

[0003] In the sand laying and compacting operation of the sand mold 3D printer for casting, the compacting structure of the traditional device is difficult to quickly separate from the compacted sand surface when returning after completing a single sand laying and compacting, which easily causes secondary compaction. Moreover, since there is no new sand to supplement at this time, the compacting roller directly acts on the compacted sand surface, and the pressure has no place to release, and can only be released by further compressing the residual space between the sand particles to achieve "over-densification". Meanwhile, the compacting component inevitably contacts a small amount of sand coated with glue during the compacting operation, and the surface is easy to adhere to sand particles with binder. If these adhered sand particles are not cleaned in time, they will directly affect the compaction flatness of the subsequent sand laying, and may also contaminate the newly laid sand, reducing the overall molding quality of the sand mold, and ultimately affecting the production precision of the castings. SUMMARY

[0004] The purpose of the present application is to provide a sand mold 3D printer for casting which avoids secondary compaction and completes cleaning of the compacting roller by lifting the compacting roller.

[0005] The present application achieves the above-mentioned purposes by the following technical solutions: A sand mold 3D printer for casting, comprising a printer main body and a sand inlet cylinder arranged on the printer main body, wherein an electric sliding table one and an electric sliding table two are arranged in the printer main body, a sand laying mechanism is connected to the electric sliding table one, the sand laying mechanism comprises a side plate and a horizontal plate, and a sand dropping assembly is arranged on the horizontal plate; Further comprising: A lifting and compacting mechanism, wherein the lifting and compacting mechanism comprises a compacting roller, the compacting roller is slidingly arranged on the side plate, a control assembly is arranged on the side plate, the control assembly is connected to the compacting roller, a horizontal rod is rotatably arranged on the horizontal plate, and a linkage mechanism is arranged between the horizontal rod and the compacting roller; A cleaning mechanism, wherein the cleaning mechanism comprises a brush roller, the brush roller is rotatably arranged on the horizontal plate, and the brush roller is movably connected to the compacting roller.

[0006] As a further optimization scheme of the present application, a guide rail is arranged outside the side plate, a bearing seat is slidably arranged in the guide rail, the bearing seat is arranged at both ends of the compaction roller, a servo motor two is fixedly arranged on the cross plate, a synchronous wheel two is arranged on the cross rod and the servo motor two, and a synchronous belt two is sleeved on the synchronous wheel two.

[0007] As a further optimization scheme of the present application, the linkage mechanism comprises a driving gear, a wheel shaft is fixedly arranged on the driving gear, connecting rods are rotatably arranged at both ends of the wheel shaft, the wheel shaft is connected with the cross rod and the compaction roller through the connecting rods, the connecting rods are rotatably connected with the compaction roller and the cross rod respectively, a fixed gear is arranged on the compaction roller and the cross rod, and the fixed gear is engaged with the driving gear.

[0008] As a further optimization scheme of the present application, the control assembly comprises a servo motor three, a screw rod is fixedly arranged at the output end of the servo motor three, a threaded sleeve is fixedly arranged on the bearing seat, and the threaded sleeve is sleeved on the screw rod.

[0009] As a further optimization scheme of the present application, reversing gears are fixedly arranged at both ends of the brush roller, drive gears are fixedly arranged at both ends of the cross rod, the drive gears are engaged with the reversing gears, L-shaped plates are fixedly arranged between the side plates, and the L-shaped plates are located below the brush roller.

[0010] As a further optimization scheme of the present application, the cross plate is fixedly connected with the side plates at both ends, the side plates are fixedly connected with the electric sliding platform, an avoiding groove is formed in the side plate, the compaction roller is slidably arranged in the side plate through the avoiding groove, an outer protective cover is fixedly sleeved on the side plate, a sand inlet is formed in the outer protective cover, and the sand inlet is movably connected with a sand inlet cylinder.

[0011] As a further optimization scheme of the present application, the sand dropping assembly comprises a sand storage box, the sand storage box is fixedly arranged on the cross plate, the sand storage box is located below the sand inlet, an opening and closing plate is rotatably arranged on the cross plate, the opening and closing plate is located below the sand storage box, a servo motor one is fixedly arranged on the cross plate, a synchronous wheel one is fixedly arranged on the rotating shaft of the output end of the servo motor one and the opening and closing plate, a synchronous belt one is sleeved on the synchronous wheel one, and a leveling mechanism is arranged on the cross plate.

[0012] As a further optimization scheme of the present application, the leveling mechanism comprises a belt pulley, the belt pulleys are symmetrically rotatably arranged on the cross plate, a servo motor four is fixedly arranged on the cross plate, the output end of the servo motor four is fixedly connected with one of the belt pulleys, a belt is sleeved on the belt pulleys, a sliding rail is fixedly arranged on the cross plate, a leveling plate is slidably arranged on the sliding rail, the leveling plate is fixed with the belt, and the leveling plate is slidably arranged in the sand storage box.

[0013] As a further optimization of the present invention, an electric slide table three is connected to the electric slide table two, and an adhesive applicator is provided on the electric slide table three.

[0014] As a further optimization of the present invention, a support platform is provided on the printer body, a through opening is provided on the support platform, a waste collection trough is provided on the support platform, the waste collection trough is located below the sand spreading mechanism, a lifting sand box is slidably arranged inside the printer body, and a lifting platform is slidably arranged inside the lifting sand box.

[0015] The beneficial effects of this invention are as follows: 1. Unlike existing technologies, in actual use, through the control components, guide rails and bearing seats in the lifting and compaction mechanism, when the sand spreading mechanism returns, the servo motor drives the screw to rotate, which drives the threaded sleeve and bearing seat to slide up the guide rail, so that the compaction roller moves away from the sand surface synchronously. This effectively avoids secondary compaction of the already compacted sand mold during the return trip, ensuring the integrity of the sand mold structure and dimensional accuracy.

[0016] 2. Unlike existing technologies, in actual use, the cleaning mechanism utilizes a brush roller, drive gear, reversing gear, and L-shaped plate, along with a rotating crossbar, to drive the brush roller to rotate in the opposite direction. This efficiently removes the adhesive-coated molding sand adhering to the surface of the compaction roller. The brushed-off sand particles are guided by the L-shaped plate, ensuring the cleanliness of the compaction roller surface and preventing contamination of subsequent molding sand. This also improves the flatness of subsequent compaction operations, thereby ensuring the quality of sand mold forming and the precision of casting production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 Internal structure diagram; Figure 3 This is a schematic diagram of the structure of the support platform of the present invention; Figure 4 This is a schematic diagram of the sand-laying mechanism of the present invention; Figure 5 This is the present invention. Figure 4 Internal structure diagram; Figure 6 This is the present invention. Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is the present invention. Figure 5 Enlarged structural diagram at point B; Figure 8 This is the present invention. Figure 5 Explosion structure diagram; Figure 9 This is the present invention. Figure 8 Enlarged structural diagram at point C; Figure 10This is a schematic diagram of the lifting and compaction mechanism of the present invention; Figure 11 This is a schematic diagram of the sweeping mechanism structure of the present invention; Figure 12 This is a schematic diagram of the sand-falling component structure of the present invention.

[0018] In the diagram: 1. Printer body; 11. Electric slide table one; 12. Electric slide table two; 121. Electric slide table three; 2. Sand inlet cylinder; 13. Support platform; 131. Through-hole; 132. Waste collection trough; 3. Lifting sand box; 31. Lifting platform; 4. Sand spreading mechanism; 41. Outer cover; 411. Sand inlet; 42. Side plate; 421. Clearance groove; 43. Horizontal plate; 44. Sand drop assembly; 441. Sand storage box; 442. Opening and closing plate; 443. Servo motor one; 444. Synchronous belt one; 5. Lifting and compaction mechanism; 51. Compaction roller; 511. Bearing seat; 512. Guide rail; 52. Crossbar; 53. Servo motor II; 531. Synchronous belt II; 54. Linkage mechanism; 541. Fixed gear; 542. Moving gear; 543. Wheel axle; 544. Connecting rod; 55. Control component; 551. Servo motor III; 552. Screw; 553. Threaded sleeve; 6. Cleaning mechanism; 61. Brush roller; 611. Reversing gear; 62. L-shaped plate; 63. Drive gear; 7. Sweeping mechanism; 71. Belt; 711. Pulley; 72. Servo motor IV; 73. Slide rail; 74. Sweeping plate; 8. Glue applicator. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example 1, as Figure 1 - Figure 3As shown, a sand mold 3D printer for casting includes a printer body 1 and a sand inlet cylinder 2 disposed on the printer body 1. The printer body 1 is equipped with an electric slide table 11 and an electric slide table 2 12. A support platform 13 is disposed on the printer body 1, with a through-hole 131 and a waste collection trough 132. A lifting sand box 3 is slidably disposed within the printer body 1, and a lifting platform 31 (an electric lifting platform 31, which is existing technology, will not be described in detail) is slidably disposed within the lifting sand box 3. An electric slide table 31 is connected to the electric slide table 2 12, and the electric slide table 31 is equipped with... The machine includes a glue applicator 8, in which the lifting sand box 3 can slide along a track inside the printer body 1 (this track is an electric track, which is existing technology and will not be described in detail), making it easy to adjust to the designated working position according to the operation requirements; the lifting platform 31 slides inside the lifting sand box 3, and can be precisely adjusted to the sand spreading height; the combination of the electric sliding platform 2 12 and the electric sliding platform 3 121 provides two-dimensional motion drive for the glue applicator 8, ensuring that the glue spreading trajectory is accurate and controllable; the through-hole 131 of the support platform 13 is connected to the lifting platform 31 to complete the work of spreading on the surface; the waste collection tank 132 can complete the waste sand collection operation to avoid the accumulation of waste sand and contamination of the equipment interior.

[0021] like Figure 4 - Figure 5 and Figure 12 As shown, a sand-spreading mechanism 4 is connected to the electric slide table 11. A waste collection trough 132 is located below the sand-spreading mechanism 4. The sand-spreading mechanism 4 includes a side plate 42 and a horizontal plate 43. The two ends of the horizontal plate 43 are fixed to the side plate 42 respectively. The side plate 42 is fixedly connected to the electric slide table 11. An outer protective cover 41 is fixedly fitted on the side plate 42. A sand inlet 411 is opened on the outer protective cover 41. The sand inlet 411 is movably connected to the sand inlet cylinder 2. A sand-falling assembly 44 is provided on the horizontal plate 43. The sand-falling assembly 44 includes a sand storage box 441. The sand storage box 441 is fixedly installed on the horizontal plate 43 and is located below the sand inlet 411. An opening and closing plate 442 is rotatably installed on the horizontal plate 43 and is located below the sand storage box 441. A servo motor is fixedly installed on the horizontal plate 43. 443, a synchronous pulley is fixedly installed on the output end of the servo motor 443 and the rotating shaft of the opening and closing plate 442. A synchronous belt 444 is fitted on the synchronous pulley. The side plate 42 and the cross plate 43 are fixed to form a stable frame structure, which provides stable support for the sand spreading mechanism 4 and ensures its stability when moving with the electric slide table 11. The outer cover 41 can effectively block the molding sand splash and reduce equipment pollution. The sand inlet 411 is movably connected to the sand inlet cylinder 2, which can not only ensure smooth sand feeding, but also adapt to the movement of the sand spreading mechanism 4. The sand storage box 441 serves as a temporary storage device for molding sand. The opening and closing of the opening and closing plate 442 is realized by the drive of the servo motor 443 and the synchronous belt 444. The amount of sand falling can be precisely controlled to avoid excessive accumulation or insufficient molding sand and ensure uniform sand spreading.

[0022] likeFigure 5 - Figure 8 and Figure 10 As shown, a lifting and compaction mechanism 5 is provided on the horizontal plate 43. The lifting and compaction mechanism 5 includes a compaction roller 51, which is slidably mounted on the side plate 42. The side plate 42 has a clearance groove 421, through which the compaction roller 51 is slidably mounted. A guide rail 512 is provided on the outer side of the side plate 42, and a bearing seat 511 is slidably mounted in the guide rail 512. The bearing seats 511 are located at both ends of the compaction roller 51. A crossbar 52 is rotatably mounted on the horizontal plate 43, and a servo motor 53 is fixedly mounted on the horizontal plate 43. Both the servo motor 53 and the crossbar 52 are equipped with synchronous pulleys 53 and synchronous belts 531. The clearance groove 421 provides space for the lifting and lowering movement of the compaction roller 51, avoiding structural interference with the side plate 42. The cooperation between the guide rail 512 and the bearing seat 511 ensures that the lifting and lowering process of the compaction roller 51 is smooth and without deviation, ensuring compaction accuracy. The servo motor 53 drives the crossbar 52 through the synchronous belt 531, which has high transmission efficiency and controllable speed, providing stable rotational power for the subsequent compaction roller 51 and ensuring uniform compaction of the molding sand.

[0023] like Figure 6 , Figure 7 and Figure 10 As shown, a linkage mechanism 54 is provided between the crossbar 52 and the compaction roller 51. The linkage mechanism 54 includes a moving gear 542, on which a wheel axle 543 is fixedly mounted. Connecting rods 544 are rotatably mounted at both ends of the wheel axle 543. The wheel axle 543 is connected to the crossbar 52 and the compaction roller 51 respectively through the connecting rods 544. The connecting rods 544 are rotatably connected to the compaction roller 51 and the crossbar 52 respectively. Fixed gears 541 are provided on both the compaction roller 51 and the crossbar 52. The fixed gears 541 mesh with the moving gear 542. A control component 55 is provided on the side plate 42. The control component 55 includes a servo motor 551. The servo motor 551 outputs... A screw 552 is fixedly installed at the outlet end, and a threaded sleeve 553 is fixedly installed on the bearing seat 511. The threaded sleeve 553 is threaded onto the screw 552. The meshing of the fixed gear 541 and the moving gear 542 in the linkage mechanism 54 and the rotational connection of the connecting rod 544 can ensure the synchronous rotation of the crossbar 52 and the compaction roller 51, and can also adapt to the lifting and lowering movement of the compaction roller 51, ensuring continuous power transmission. The control component 55 drives the screw 552 and the threaded sleeve 553 through the threaded transmission of the servo motor 551 to realize precise control of the lifting and lowering of the compaction roller 51, which is convenient for adjusting the compaction pressure and changing the position of the compaction roller 51 according to the sand mold requirements.

[0024] like Figure 8 - Figure 9As shown, the cleaning mechanism 6 includes a brush roller 61, which is rotatably mounted on the horizontal plate 43. Reversing gears 611 are fixedly mounted at both ends of the brush roller 61, and driving gears 63 are fixedly mounted at both ends of the horizontal bar 52. The driving gears 63 mesh with the reversing gears 611. An L-shaped plate 62 is fixedly mounted between the side plates 42 and is located below the brush roller 61. The meshing of the driving gears 63 and the reversing gears 611 causes the brush roller 61 and the compaction roller 51 to rotate in opposite directions, thereby increasing the cleaning force of the brush bristles on the surface of the compaction roller 51 and effectively removing the adhesive molding sand. The L-shaped plate 62 can guide the waste sand brushed off to the waste collection trough 132, ensuring that the waste sand falls completely into the waste collection trough 132 and avoiding contamination of the newly laid molding sand.

[0025] like Figure 8 and Figure 11 As shown, a leveling mechanism 7 is provided on the horizontal plate 43. The leveling mechanism 7 includes a pulley 711, which is symmetrically rotated on the horizontal plate 43. A servo motor 72 is fixedly installed on the horizontal plate 43. The output end of the servo motor 72 is fixedly connected to one of the pulleys 711. A belt 71 is sleeved on the pulley 711. A slide rail 73 is fixedly installed on the horizontal plate 43. A sweeping plate 74 is slidably installed on the slide rail 73. The sweeping plate 74 is fixed to the belt 71 and is slidably installed in the sand storage box 441. The servo motor 72 drives the sweeping plate 74 to slide back and forth along the slide rail 73 through the pulley 711 and the belt 71. This can evenly spread the molding sand in the sand storage box 441, ensuring that the molding sand distribution is consistent before falling sand. This provides a foundation for the uniform laying of molding sand on the subsequent lifting platform 31 and avoids deviations in the thickness of the sand mold after compaction due to uneven accumulation of molding sand.

[0026] It should be noted that the workflow of this sand mold 3D printer for casting is as follows: The lifting sand box 3 slides along the inside of the printer body 1 to the designated working position, and the lifting platform 31 slides upward in the lifting sand box 3 to the preset sand spreading height, officially starting the sand spreading operation process. First, the sand inlet cylinder 2 is aligned with the sand inlet 411 on the outer cover 41, continuously conveying molding sand into the sand storage box 441 fixed on the horizontal plate 43; then the leveling mechanism 7 starts to work, the servo motor 72 on the horizontal plate 43 drives the pulley 711 fixedly connected to it to rotate, and through the belt 71 drives another set of symmetrically arranged pulleys 711 to rotate synchronously, and the sweeping plate 74 fixedly connected to the belt 71 slides back and forth along the slide rail 73 to evenly spread the molding sand in the sand storage box 441, ensuring a stable amount of sand falling.

[0027] After the molding sand is prepared, the electric slide table 11 is started. Since the side plate 42 is fixedly connected to the electric slide table 11, and the two ends of the horizontal plate 43 are fixed to the side plate 42 to form an integral frame, the sand spreading mechanism 4 moves smoothly above the lifting platform 31 along the preset trajectory with the electric slide table 11. At this time, the servo motor 443 on the horizontal plate 43 is started, and the synchronous wheel 1 at its output end drives the rotating shaft of the opening and closing plate 442 to rotate through the synchronous belt 444, so that the opening and closing plate 442 flips and opens around the rotating shaft on the horizontal plate 43, and the molding sand in the sand storage box 441 falls evenly onto the working surface of the lifting platform 31.

[0028] As the molding sand falls, the compaction roller 51 behind the sand storage box 441 simultaneously enters the compaction process: the servo motor 53 fixed on the horizontal plate 43 starts, and the synchronous wheel 2 at its output end drives the horizontal bar 52 to rotate through the synchronous belt 531. The fixed gears 541 at both ends of the horizontal bar 52 rotate accordingly, and the moving gears 542 meshing with the fixed gears 541 drive the fixed gears 541 at both ends of the compaction roller 51 to rotate, ultimately driving the compaction roller 51 to rotate smoothly and compact the molding sand scattered on the lifting platform 31 into shape.

[0029] After the sand-spreading mechanism 4 completes a single sand-spreading stroke, the electric slide table 11 drives it to return to its reset position. During the return stroke, the control component 55 is activated: the screw 552 fixed at the output end of the servo motor 3 551 begins to rotate, and the threaded sleeve 553 fixedly connected to the bearing seat 511, under the threaded transmission action of the screw 552, drives the bearing seat 511 to slide upward along the guide rail 512, thereby causing the compaction roller 51 to rise synchronously. At this time, the moving gear 542 always maintains a meshing state with the fixed gear 541 through the connecting rod 544. In this way, the compaction roller 51 is away from the already compacted sand surface, avoiding secondary crushing of the sand mold during the return stroke. At this time, the compaction roller 51 is in a state of not contacting the brush roller 61.

[0030] After the sand spreading mechanism 4 has fully returned to its original position, the compaction roller 51 is lifted upward again under the drive of the control component 55 until it contacts the bristles of the brush roller 61 that is rotatably mounted on the horizontal plate 43. As the horizontal bar 52 continues to rotate, the drive gears 63 fixed at both ends of the horizontal bar 52 mesh with the reversing gears 611 at both ends of the brush roller 61, causing the brush roller 61 to rotate in the opposite direction to the compaction roller 51. At the same time, the L-shaped plate 62 fixed between the side plates 42 is located below the brush roller 61, and its edge is in contact with the surface of the compaction roller 51. The adhering molding sand brushed off by the brush roller 61 during its rotation falls into the gap between the L-shaped plate 62 and the horizontal plate 43 under the guidance of the L-shaped plate 62, and finally falls into the waste collection trough 132 below, completing the cleaning operation of the compaction roller 51.

[0031] At the same time, the second electric slide table 12 starts and drives the third electric slide table 121 on it to move. The glue applicator 8 installed on the third electric slide table 121 moves precisely along the preset path on the compacted sand surface under the drive of the double electric slide tables, and simultaneously completes the operation of spraying adhesive on the sand mold.

[0032] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A sand mold 3D printer for casting, comprising a printer body (1) and a sand inlet cylinder (2) disposed on the printer body (1), wherein an electric slide table one (11) and an electric slide table two (12) are disposed inside the printer body (1), characterized in that: The electric slide table (11) is connected to a sand-laying mechanism (4), which includes a side plate (42) and a horizontal plate (43). A sand-falling assembly (44) is provided on the horizontal plate (43). It also includes: The lifting and compaction mechanism (5) includes a compaction roller (51), which is slidably disposed on a side plate (42). A control component (55) is disposed on the side plate (42), which is connected to the compaction roller (51). A crossbar (52) is rotatably disposed on the horizontal plate (43), and a linkage mechanism (54) is disposed between the crossbar (52) and the compaction roller (51). The cleaning mechanism (6) includes a brush roller (61) which is rotatably mounted on a horizontal plate (43) and is movably connected to a compaction roller (51).

2. The sand mold 3D printer for casting according to claim 1, characterized in that: A guide rail (512) is provided on the outer side of the side plate (42), and a bearing seat (511) is slidably provided in the guide rail (512). The bearing seat (511) is provided at both ends of the compaction roller (51). A servo motor (53) is fixedly provided on the cross plate (43). A synchronous wheel (53) is provided on both the servo motor (53) and the cross bar (52). A synchronous belt (531) is sleeved on the synchronous wheel (53).

3. A sand mold 3D printer for casting according to claim 1, characterized in that: The linkage mechanism (54) includes a moving gear (542), a wheel axle (543) is fixedly mounted on the moving gear (542), and connecting rods (544) are rotatably mounted at both ends of the wheel axle (543). The wheel axle (543) is connected to the crossbar (52) and the compaction roller (51) respectively through the connecting rods (544). The connecting rods (544) are rotatably connected to the compaction roller (51) and the crossbar (52) respectively. Fixed gears (541) are mounted on both the compaction roller (51) and the crossbar (52). The fixed gears (541) mesh with the moving gear (542).

4. A sand mold 3D printer for casting according to claim 2, characterized in that: The control component (55) includes a servo motor three (551), a screw (552) is fixedly installed at the output end of the servo motor three (551), and a threaded sleeve (553) is fixedly installed on the bearing seat (511), and the threaded sleeve (553) is threaded onto the screw (552).

5. A sand mold 3D printer for casting according to claim 1, characterized in that: The brush roller (61) is fixedly provided with reversing gears (611) at both ends, and the crossbar (52) is fixedly provided with driving gears (63) at both ends. The driving gears (63) mesh with the reversing gears (611). An L-shaped plate (62) is fixedly provided between the side plates (42), and the L-shaped plate (62) is located below the brush roller (61).

6. A sand mold 3D printer for casting according to claim 1, characterized in that: The two ends of the horizontal plate (43) are fixed to the side plate (42) respectively. The side plate (42) is fixedly connected to the electric slide table (11). The side plate (42) is provided with a clearance groove (421). The compaction roller (51) is slidably mounted on the side plate (42) through the clearance groove (421). The side plate (42) is fixedly fitted with an outer protective cover (41). The outer protective cover (41) is provided with a sand inlet (411). The sand inlet (411) is movably connected to the sand inlet cylinder (2).

7. A sand mold 3D printer for casting according to claim 6, characterized in that: The sand removal assembly (44) includes a sand storage box (441), which is fixedly mounted on a horizontal plate (43). The sand storage box (441) is located below the sand inlet (411). An opening and closing plate (442) is rotatably mounted on the horizontal plate (43). The opening and closing plate (442) is located below the sand storage box (441). A servo motor (443) is fixedly mounted on the horizontal plate (43). A synchronous wheel is fixedly mounted on both the output end of the servo motor (443) and the rotation shaft of the opening and closing plate (442). A synchronous belt (444) is sleeved on the synchronous wheel. A leveling mechanism (7) is mounted on the horizontal plate (43).

8. A sand mold 3D printer for casting according to claim 7, characterized in that: The sweeping mechanism (7) includes a pulley (711), which is symmetrically rotated on a horizontal plate (43). A servo motor (72) is fixedly mounted on the horizontal plate (43). The output end of the servo motor (72) is fixedly connected to one of the pulleys (711). A belt (71) is sleeved on the pulley (711). A slide rail (73) is fixedly mounted on the horizontal plate (43). A sweeping plate (74) is slidably mounted on the slide rail (73). The sweeping plate (74) is fixed to the belt (71) and slidably mounted in the sand storage box (441).

9. A sand mold 3D printer for casting according to claim 1, characterized in that: The second electric slide table (12) is connected to the third electric slide table (121), and the third electric slide table (121) is equipped with a glue applicator (8).

10. A sand mold 3D printer for casting according to claim 1, characterized in that: The printer body (1) is provided with a support platform (13), the support platform (13) is provided with a through opening (131), the support platform (13) is provided with a waste collection trough (132), the waste collection trough (132) is located below the sand spreading mechanism (4), the printer body (1) is slidably provided with a lifting sand box (3), and the lifting sand box (3) is slidably provided with a lifting platform (31).

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