A sand mold 3D printer for casting

Abstract

The application belongs to the technical field of casting, and particularly relates to a sand mold 3D printer for casting, which comprises a printer main body and a sand inlet cylinder arranged on the printer main body. 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. A sand falling assembly is arranged on the horizontal plate. The sand mold 3D printer for casting is provided with a control assembly, a guide rail and a bearing seat in a lifting and compacting mechanism. When the sand laying mechanism returns, a servo motor three drives a screw rod to rotate, drives a threaded sleeve and a bearing seat to slide upwards along the guide rail, and makes the compacting roller synchronously move away from the sand surface, so that the compacting roller is prevented from secondarily rolling the compacted sand mold when returning. The brush roller is reversely operated to efficiently brush off the adhesive sand adhered to the surface of the compacting roller. The brushed sand is guided by an L-shaped plate to fall into a waste collecting groove, so that the surface of the compacting roller is kept clean and the subsequent sand is prevented from being polluted.

Description

Technical Field

[0001] This invention belongs to the field of casting technology, specifically relating to a sand mold 3D printer for casting. Background Technology

[0002] Sand mold 3D printers are industrial-grade additive manufacturing equipment for the foundry industry. Through technologies such as binder jetting and selective laser sintering, they bond molding materials such as quartz sand and ceramic sand layer by layer to directly create sand molds or cores. Eliminating the need for traditional mold-making processes, they can quickly achieve integrated molding of sand molds with complex internal cavities and irregular shapes, significantly shortening the R&D and production cycle of castings and reducing the production costs of customized, small-batch castings. They are widely used in the manufacturing of complex castings in the automotive, aerospace, and construction machinery industries.

[0003] In the sand-laying and compaction operation of a sand mold 3D printer for casting, the compaction structure of traditional equipment has difficulty in quickly separating from the already compacted sand surface when returning after completing a single sand-laying and compaction operation. This easily leads to secondary compaction problems. Furthermore, since there is no new sand to replenish the sand layer at this time, the compaction roller acts directly on the already compacted sand surface, and the pressure has nowhere to be released. It can only achieve "over-densification" by further compressing the residual gaps between sand particles. At the same time, the compaction components inevitably come into contact with a small amount of adhesive-coated molding sand during the compaction operation. The surface is very prone to adhering molding sand particles with adhesive. If these adhering sand particles are not cleaned in time, they will directly affect the compaction smoothness of subsequent sand laying and may also contaminate the newly laid molding sand, reduce the overall molding quality of the sand mold, and ultimately affect the production precision of the casting. Summary of the Invention

[0004] The purpose of this invention is to provide a casting sand mold 3D printer that avoids secondary compaction and cleans the compaction roller by raising and lowering the compaction roller in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A sand mold 3D printer for casting includes a printer body and a sand inlet cylinder disposed on the printer body. The printer body is provided with an electric slide table one and an electric slide table two. A sand spreading mechanism is connected to the electric slide table one. The sand spreading mechanism includes a side plate and a horizontal plate. A sand dropping component is disposed on the horizontal plate.

[0007] It also includes:

[0008] A lifting and compaction mechanism includes a compaction roller, which is slidably mounted on a side plate. A control component is mounted on the side plate and connected to the compaction roller. A crossbar is rotatably mounted on the horizontal plate, and a linkage mechanism is provided between the crossbar and the compaction roller.

[0009] A cleaning mechanism, comprising a brush roller rotatably mounted on a horizontal plate, the brush roller being movably connected to a compaction roller.

[0010] As a further optimization of the present invention, a guide rail is provided on the outer side of the side plate, and a bearing seat is slidably provided in the guide rail. The bearing seat is provided at both ends of the compaction roller. A servo motor II is fixedly provided on the horizontal plate. A synchronous wheel II is provided on both the servo motor II and the horizontal bar. A synchronous belt II is sleeved on the synchronous wheel II.

[0011] As a further optimization of the present invention, the linkage mechanism includes a moving gear, a wheel axle fixedly mounted on the moving gear, connecting rods rotatably mounted at both ends of the wheel axle, the wheel axle being connected to the crossbar and the compaction roller respectively via the connecting rods, the connecting rods being rotatably connected to the compaction roller and the crossbar respectively, and fixed gears being mounted on both the compaction roller and the crossbar, the fixed gears meshing with the moving gear.

[0012] As a further optimization of the present invention, the control component includes a servo motor three, a screw is fixedly installed at the output end of the servo motor three, a threaded sleeve is fixedly installed on the bearing seat, and the threaded sleeve is threaded onto the screw.

[0013] As a further optimization of the present invention, reversing gears are fixedly provided at both ends of the brush roller, driving gears are fixedly provided at both ends of the crossbar, the driving gears mesh with the reversing gears, and an L-shaped plate is fixedly provided between the side plates, the L-shaped plate being located below the brush roller.

[0014] As a further optimization of the present invention, the two ends of the horizontal plate are respectively fixed to the side plate, the side plate is fixedly connected to the electric slide table, the side plate is provided with an avoidance groove, the compaction roller is slidably disposed on the side plate through the avoidance groove, the side plate is fixedly fitted with an outer protective cover, the outer protective cover is provided with a sand inlet, and the sand inlet is movably connected to the sand inlet cylinder.

[0015] As a further optimization of the present invention, the sand removal assembly includes a sand storage box, which is fixedly mounted on a horizontal plate and located below the sand inlet. An opening and closing plate is rotatably mounted on the horizontal plate and located below the sand storage box. A servo motor is fixedly mounted on the horizontal plate. A synchronous wheel is fixedly mounted on both the output end of the servo motor and the rotation shaft of the opening and closing plate. A synchronous belt is sleeved on the synchronous wheel. A leveling mechanism is provided on the horizontal plate.

[0016] As a further optimization of the present invention, the sweeping mechanism includes a pulley, which is symmetrically rotated on a horizontal plate. A servo motor is fixedly mounted on the horizontal plate, and the output end of the servo motor is fixedly connected to one of the pulleys. A belt is sleeved on the pulley. A slide rail is fixedly mounted on the horizontal plate, and a sweeping plate is slidably mounted on the slide rail. The sweeping plate is fixed to the belt and is slidably mounted in a sand storage box.

[0017] 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.

[0018] 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.

[0019] The beneficial effects of this invention are as follows:

[0020] 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.

[0021] 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

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is the present invention. Figure 1 Internal structure diagram;

[0024] Figure 3 This is a schematic diagram of the structure of the support platform of the present invention;

[0025] Figure 4 This is a schematic diagram of the sand-laying mechanism of the present invention;

[0026] Figure 5 This is the present invention. Figure 4 Internal structure diagram;

[0027] Figure 6 This is the present invention. Figure 5 Enlarged structural diagram at point A in the middle;

[0028] Figure 7 This is the present invention. Figure 5 Enlarged structural diagram at point B;

[0029] Figure 8 This is the present invention. Figure 5 Explosion structure diagram;

[0030] Figure 9 This is the present invention. Figure 8 Enlarged structural diagram at point C;

[0031] Figure 10 This is a schematic diagram of the lifting and compaction mechanism of the present invention;

[0032] Figure 11 This is a schematic diagram of the sweeping mechanism structure of the present invention;

[0033] Figure 12 This is a schematic diagram of the sand-falling component structure of the present invention.

[0034] 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

[0035] 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.

[0036] Example 1, such as Figure 1 - Figure 3 As 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.

[0037] like Figure 4 - Figure 5 and Figure 12As 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.

[0038] like Figure 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.

[0039] like Figure 6 , Figure 7 and Figure 10As 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.

[0040] like Figure 8 - Figure 9 As 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.

[0041] like Figure 8 and Figure 11As 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.

[0042] It should be noted that the workflow of this sand mold 3D printer for casting is as follows:

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 casting sand mold 3D printer, comprising a printer main body (1) and a sand inlet cylinder (2) arranged on the printer main body (1), wherein an electric slide table I (11) and an electric slide table II (12) are arranged in the printer main body (1), characterized in that: The electric slide platform one (11) is connected with sand paving mechanism (4), the sand paving mechanism (4) includes side plate (42) and cross plate (43), the cross plate (43) is provided with sand falling assembly (44); Also include: Lifting compaction mechanism (5), the lifting compaction mechanism (5) includes compaction roller (51), the compaction roller (51) is slidably arranged on the side plate (42), the side plate (42) is provided with control assembly (55), the control assembly (55) is connected with compaction roller (51), the cross plate (43) is rotatably provided with cross bar (52), the cross bar (52) is provided with linkage mechanism (54) between compaction roller (51); Cleaning mechanism (6), the cleaning mechanism (6) includes brush roller (61), the brush roller (61) is rotatably arranged on the cross plate (43), and the brush roller (61) is movably connected with the compaction roller (51); The linkage mechanism (54) includes a driving gear (542), the driving gear (542) is fixedly provided with an axle (543), the axle (543) is rotatably provided with a connecting rod (544) at both ends, the axle (543) is connected with the cross bar (52) and the compaction roller (51) through the connecting rod (544), the connecting rod (544) is rotatably connected with the compaction roller (51) and the cross bar (52), and the compaction roller (51) and the cross bar (52) are provided with a fixed gear (541), the fixed gear (541) is engaged with the driving gear (542); The brush roller (61) is fixedly provided with a reversing gear (611) at both ends, the cross bar (52) is fixedly provided with a driving gear (63) at both ends, the driving gear (63) is engaged with the reversing gear (611), and the side plate (42) is fixedly provided with an L-shaped plate (62) between the side plate (42), the L-shaped plate (62) is located below the brush roller (61); The cross plate (43) is fixed with the side plate (42) at both ends, and the side plate (42) is fixedly provided with an outer cover (41).

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

3. The sand form 3D printer for casting according to claim 2, characterized in that: The control assembly (55) includes a servo motor three (551), the servo motor three (551) is fixedly provided with a screw rod (552) at the output end, the bearing seat (511) is fixedly provided with a threaded sleeve (553), and the threaded sleeve (553) is threadedly sleeved on the screw rod (552).

4. The sand 3D printer for casting according to claim 1, characterized in that: The side plate (42) is fixedly connected with the electric slide platform one (11), the side plate (42) is provided with an avoiding slot (421), the compaction roller (51) is slidably arranged on the side plate (42) through the avoiding slot (421), the outer shield (41) is provided with a sand inlet (411), and the sand inlet (411) is movably connected with the sand inlet cylinder (2).

5. The sand 3D printer for casting according to claim 4, characterized in that: The shakeout assembly (44) comprises a sand storage box (441), the sand storage box (441) is fixedly arranged on the horizontal plate (43), the sand storage box (441) is located below the sand inlet (411), the horizontal plate (43) is rotatably provided with an opening and closing plate (442), the opening and closing plate (442) is located below the sand storage box (441), the horizontal plate (43) is fixedly provided with a servo motor one (443), the servo motor one (443) is fixedly arranged on the rotating shaft of the opening and closing plate (442), and the synchronous belt one (444) is sleeved on the synchronous pulley one.

6. The sand 3D printer for casting according to claim 5, characterized in that: The sweep leveling mechanism (7) comprises a belt pulley (711), the belt pulley (711) is symmetrically rotatably arranged on the horizontal plate (43), the horizontal plate (43) is fixedly provided with a servo motor four (72), the servo motor four (72) is fixedly connected with one of the belt pulleys (711), the belt pulley (711) is sleeved with a belt (71), the horizontal plate (43) is fixedly provided with a slide rail (73), the slide rail (73) is slidably provided with a sweep leveling plate (74), the sweep leveling plate (74) is fixed with the belt (71), and the sweep leveling plate (74) is slidably arranged in the sand storage box (441).

7. The sand 3D printer for casting according to claim 1, characterized in that: The electric slide platform three (121) is connected with the electric slide platform two (12), and the electric slide platform three (121) is provided with a rubber coating machine (8).

8. The sand 3D printer for casting according to claim 1, characterized in that: The printer main body (1) is provided with a bearing table (13), the bearing table (13) is provided with a through hole (131), the bearing table (13) is provided with a waste collecting groove (132), the waste collecting groove (132) is located below the sand laying mechanism (4), the printer main body (1) is slidably provided with a lifting sand box (3), and the lifting sand box (3) is slidably provided with a lifting table (31).

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