Material spreading control device and material spreading method for 3D sand mold printer

Abstract

The invention relates to the technical field of sand mold castings, and discloses a 3D sand mold printer material spreading control device and a material spreading method.The 3D sand mold printer material spreading control device comprises a printing main machine, a conveyor, a sand cleaning machine and a sand box, a sand spreading device is arranged in the printing main machine and comprises a movable inner bin, a sand blasting assembly and an auxiliary assembly, and the sand blasting assembly and the auxiliary assembly are arranged on the two sides in the movable inner bin; the sand blasting assembly comprises a sand storage bin and a sand outlet channel arranged at the bottom of the sand storage bin, and a sand discharging piece is arranged in the sand outlet channel. The auxiliary assembly comprises a sand scraping piece, a jolt ramming piece and a rolling piece, the sand scraping piece is arranged between the inner wall of the movable inner bin and the sand outlet channel, the jolt ramming piece is arranged at the position opposite to the advancing direction of the sand outlet channel, and a transmission piece is arranged between the auxiliary assembly and the sand discharging piece. Through the arrangement of the sand scraping piece, when the sand discharging piece and the sand outlet channel lay sand powder on the top face of the sand box, a sand powder layer on the top face of the sand box is flattened and scraped away in advance, so that the effect that when the sand powder is laid on the sand outlet channel, it is guaranteed that the top face of the sand box is in a horizontal state is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mold castings, and specifically to a 3D sand mold printer material laying control device and a material laying method. Background Art

[0002] 3D printing, also known as additive manufacturing, is a manufacturing method that uses the idea of dimensionality reduction manufacturing to transform a complex three-dimensional model of the required forming work into a combination of simple two-dimensional cross-sections through slicing, and then uses powder materials to print layer by layer, stack layer by layer, and form a three-dimensional model with any complex structure from bottom to top. Sand mold 3D printing is a rapid prototyping technology mainly based on micro-droplet jet forming. During the process of laying the sand powder layer by the sand mold printer, first, the sand powder is laid on the sand box through a sand laying device, then the sand powder layer is compacted by a corresponding pressure roller, and then an adhesive is sprayed. However, during the process of layer-by-layer printing of the sand box, there is a tendency for too much sand powder at a certain position. When the pressure roller rolls over this position, it is easy for the sand layer to be not tightly compacted, which may easily lead to the problem of looseness in a certain part of the printed model. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides the following technical solutions: A 3D sand mold printer material laying control device includes a printing host, a conveyor, a sand cleaning machine, and a sand box. A sand laying device is provided inside the printing host. The sand laying device includes a moving inner chamber, a sand blasting assembly, and an auxiliary assembly provided on both sides inside the moving inner chamber; The sand blasting assembly includes a sand storage bin and a sand outlet channel provided at the bottom of the sand storage bin. A sand discharging member is provided inside the sand outlet channel; The auxiliary assembly includes a sand scraping member, a vibrating compaction member, and a rolling compaction member. The sand scraping member is provided between the inner wall of the moving inner chamber and the sand outlet channel. The vibrating compaction member is provided at the opposite of the advancing direction of the sand outlet channel. The rolling compaction member is provided at the opposite of the advancing direction of the vibrating compaction member; A transmission member is provided between the auxiliary assembly and the sand discharging member, so that when the sand discharging member operates, the sand scraping member scrapes against the top surface of the sand box as the moving inner chamber moves, the vibrating compaction member vibrates up and down on the top surface of the sand box, and the rolling compaction member rolls on the top surface of the sand box as the moving inner chamber moves.

[0004] Preferably, the sand box enters the printing host through the conveyor. The moving inner chamber is provided inside the printing host and is located above the sand box. The moving inner chamber moves back and forth inside the printing host. After the sand box finishes working, it is transported to the sand cleaning machine through the conveyor for demolding.

[0005] Preferably, the sand discharging member includes a rotating shaft, and a plurality of pressing plates are fixedly connected to the outer periphery of the rotating shaft. One end of each of the plurality of pressing plates contacts the inner wall of the sand discharging channel. A servo motor is fixedly connected to one side of the sand discharging channel, and the output end of the servo motor is fixedly connected to one end of the rotating shaft. The other end of the rotating shaft extends to the outer periphery of the sand discharging channel.

[0006] Preferably, the sand scraping member includes a scraping plate, and the scraping plate is fixedly installed in the moving inner cavity. Scraping groups are provided at both ends of one side of the scraping plate, and a driving group is arranged between the two scraping groups to drive the two scraping groups to operate; Each scraping group includes a first toothed belt. Two first gears are rotatably connected to one side of the scraping plate through bearings. The first toothed belt is meshed with the two first gears, and scraping blocks are fixedly connected to the outer surface of the first toothed belt; The driving group includes a plurality of meshing second gears. A bracket is fixedly connected to the side of the scraping plate away from the first toothed belt. The plurality of meshing second gears are rotatably arranged on the bracket through bearings. Connecting shafts are fixedly connected to one side of two of the second gears, and the two connecting shafts are respectively fixedly connected to two of the first gears.

[0007] Preferably, the transmission member includes a worm gear and a worm. A movable rod is rotatably connected between the scraping plate and the sand discharging channel through a bearing seat. The worm is fixedly installed on the movable rod, the worm gear is fixedly installed on one of the connecting shafts, the worm gear is meshed with the worm, and third gears are fixedly connected to one end of the movable rod and the rotating shaft respectively. A second toothed belt meshing with the third gears is provided on the two third gears.

[0008] Preferably, the compaction member includes a compaction plate. A support is fixedly connected to one side of the sand discharging channel. Guide shafts are fixedly connected to both sides of the support. Vertical plates are fixedly connected to the top of the compaction plate. Guide blocks are fixedly connected to both sides of the top of the vertical plates. The guide blocks are slidably arranged on the guide shafts. Springs are fixedly connected to the bottoms of the guide blocks and sleeved on the guide shafts. A cross plate is fixedly connected to the top of the vertical plate. A rotating rod is rotatably connected to one side of the sand discharging channel through a bearing seat. A plurality of fixing plates are fixedly connected to the outer periphery of the rotating rod. The fixing plates contact the cross plate. When the fixing plates rotate, the cross plate is driven to move downward.

[0009] Preferably, the transmission member further includes a third toothed belt. Fourth gears are fixedly connected to one end of the rotating shaft and one end of the rotating rod respectively. The fourth gear at one end of the rotating shaft is arranged on one side of the third gear. The third toothed belt is arranged on the outer peripheries of the two fourth gears and meshed with the fourth gears.

[0010] Preferably, the rolling member includes a movable roller. A right-angle plate is fixedly connected to one side of the support. A fixed seat is fixedly connected to the bottom of the right-angle plate. The movable roller is rotatably arranged at the bottom of the fixed seat through a bearing.

[0011] Preferably, the transmission member further includes two fifth gears. One of the fifth gears is rotatably disposed on the fixed seat through a bearing and fixedly connected to one end of the movable roller, and the other fifth gear is fixedly installed on the rotating rod and located on one side of the fourth gear. A fourth toothed belt meshingly connected to the fifth gears is provided on the two fifth gears.

[0012] A sand laying method for a 3D sand mold printer, which applies a control device for sand laying of a 3D sand mold printer, and the specific steps are as follows: The sand box is moved into the printing host through a conveyor, and the sand laying device lays a sand powder layer. During the laying process, the sand scraping member first contacts the sand box and scrapes off the uneven sand on the top surface of the sand box and the excess sand powder. When the sand outlet channel moves to the top surface of the sand box, the sand discharging member operates, and a sand powder layer is laid on the top surface of the sand box through the sand outlet channel. When the sand discharging member operates, it drives the transmission member to operate, thereby driving the sand scraping member to operate. At this time, the sand scraping member pushes the excess sand powder on the top surface of the sand box to both sides of the sand box, and at the same time drives the compaction member and the rolling member to operate. Through the settings of the compaction member and the rolling member, the sand powder laid on the top surface of the sand box is compacted. Then, the piezoelectric or thermal foaming nozzle in the printing host accurately sprays the liquid adhesive to a specific area of the sand layer according to the three-dimensional model cross-sectional data, and the sand grains are combined with the adhesive to solidify and form.

[0013] Compared with the prior art, the present invention provides a control device and a sand laying method for a 3D sand mold printer, and has the following beneficial effects: 1. A control device and a sand laying method for a 3D sand mold printer, through the setting of the sand scraping member, when the sand discharging member and the sand outlet channel lay the sand powder on the top surface of the sand box, the sand powder layer on the top surface of the sand box is leveled and scraped in advance, so as to achieve the effect of ensuring that the top surface of the sand box is in a horizontal state when the sand outlet channel lays the sand powder, and avoid the problem that there is too much sand powder at a certain position on the top surface of the sand box. After the pressure roller rolls this position, the top surface of the sand box becomes uneven. This solves the problem that during the multi-layer printing process of the sand box, there is often too much sand powder at a certain position, and when the pressure roller rolls this position, it is easy to have an insufficient compaction of the sand layer, which may easily lead to loosening of a certain part of the printed model.

[0014] 2. A control device and a sand laying method for a 3D sand mold printer, through the setting of the scraping group, during the process of scraping the top surface of the sand box by the scraper, the two first toothed belts rotate in opposite directions to each other, so as to push the excess sand powder scraped by the scraper during the forward movement of the scraper to both sides of the sand box through the scraping block, and the excess sand powder is transported out by the waste sand collection device in the printing host, avoiding the problem that too much sand powder accumulates on both sides of the inner cavity of the moving inner cavity during the operation of the scraper, and when the moving inner cavity moves back and forth, the excess sand powder returns to the top surface of the sand box.

[0015] 3. A material laying control device and method for a 3D sand mold printer. Through the arrangement of a vibration compaction part and a rolling compaction part, the sand powder laid on the top surface of the sand box is compacted twice. During the up-and-down vibration of the vibration compaction part, the sand powder layer is compacted by the compaction plate. When the movable roller in the rolling compaction part rolls, the indentations generated after the compaction by the compaction plate are rolled and flattened, so as to ensure that the sand powder layer remains in a flat state during the compaction process of the vibration compaction part on the sand powder layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is one of the schematic structural diagrams of a material laying control device for a 3D sand mold printer according to the present invention; Figure 2 FIG. 2 is another schematic structural diagram of a material laying control device for a 3D sand mold printer according to the present invention; Figure 3 FIG. 3 is yet another schematic structural diagram of a material laying control device for a 3D sand mold printer according to the present invention; Figure 4 FIG. 4 is still another schematic structural diagram of a material laying control device for a 3D sand mold printer according to the present invention; Figure 5 FIG. 5 is one of the schematic structural diagrams of a sand laying device according to the present invention; Figure 6 FIG. 6 is another schematic structural diagram of a sand laying device according to the present invention; Figure 7 FIG. 7 is the schematic structural diagram of a sand scraping part according to the present invention; Figure 8 For the present invention Figure 7 FIG. 8 is the schematic structural diagram of part A in FIG. Figure 9 FIG. 9 is the schematic structural diagram of a transmission part according to the present invention; Figure 10 For the present invention Figure 9 FIG. 10 is the schematic structural diagram of part B in FIG. Figure 11 FIG. 11 is the schematic structural diagram of a vibration compaction part according to the present invention; Figure 12 For the present invention Figure 11 FIG. 12 is the schematic structural diagram of part C in FIG.

[0017] In the figure: 1. Printing host; 2. Conveyor; 3. Sand cleaning machine; 4. Sand box; 5. Sand laying device; 6. Movable inner bin; 7. Sand blasting assembly; 8. Auxiliary assembly; 71. Sand storage bin; 72. Sand outlet channel; 73. Sand discharging part; 81. Sand scraping part; 82. Compacting part; 83. Rolling part; 9. Transmission part; 731. Rotating shaft; 732. Bracing plate; 733. Servo motor; 811. Scraper; 812. Scraping group; 813. Driving group; 8121. First toothed belt; 8122. First gear; 8123. Scraping block; 8131. Second gear; 8132. Bracket; 8133. Connecting shaft; 91. Worm gear; 92. Worm; 93. Movable rod; 94. Third gear; 95. Second toothed belt; 821. Compacting plate; 822. Support; 823. Guide shaft; 824. Vertical plate; 825. Guide block; 826. Spring; 827. Cross plate; 828. Rotating rod; 829. Fixed plate; 96. Third toothed belt; 97. Fourth gear; 831. Movable roller; 832. Right-angle plate; 833. Fixed seat; 98. Fifth gear; 99. Fourth toothed belt. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a 3D sand mold printer feeding control device and a feeding method.

[0020] Embodiment 1: Please refer to Figures 1 - 9 , a 3D sand mold printer feeding control device, including a printing host 1, a conveyor 2, a sand cleaning machine 3 and a sand box 4, characterized in that: a sand laying device 5 is arranged in the printing host 1, and the sand laying device 5 includes a movable inner bin 6 and a sand blasting assembly 7 and an auxiliary assembly 8 arranged on both sides inside the movable inner bin 6; The sand blasting assembly 7 includes a sand storage bin 71 and a sand outlet channel 72 arranged at the bottom of the sand storage bin 71, and a sand discharging part 73 is arranged in the sand outlet channel 72; The auxiliary assembly 8 includes a sand scraping part 81, a compacting part 82 and a rolling part 83. The sand scraping part 81 is arranged between the inner wall of the movable inner bin 6 and the sand outlet channel 72, the compacting part 82 is arranged at the opposite of the advancing direction of the sand outlet channel 72, and the rolling part 83 is arranged at the opposite of the advancing direction of the compacting part 82; A transmission member 9 is provided between the auxiliary component 8 and the sand discharging member 73, so that when the sand discharging member 73 operates, the sand scraping member 81 moves along with the movement of the moving inner chamber 6 to scrape the top surface of the sand box 4, the sand compaction member 82 vibrates up and down on the top surface of the sand box 4, and the rolling member 83 rolls on the top surface of the sand box 4 along with the movement of the moving inner chamber 6.

[0021] Specifically, the sand box 4 is moved into the printing host 1 by the conveyor 2, and the sand laying device 5 lays a sand powder layer. During the laying process, the sand scraping member 81 first contacts the sand box 4 and scrapes off the uneven and excess sand powder on the top surface of the sand box 4. When the sand discharging channel 72 moves to the top surface of the sand box 4, the sand discharging member 73 operates and lays a sand powder layer on the top surface of the sand box 4 through the sand discharging channel 72. When the sand discharging member 73 operates, it drives the transmission member 9 to operate, thereby driving the sand scraping member 81 to operate. At this time, the sand scraping member 81 pushes the excess sand powder on the top surface of the sand box 4 to both sides of the sand box 4, and at the same time drives the sand compaction member 82 and the rolling member 83 to operate. Through the settings of the sand compaction member 82 and the rolling member, the sand powder laid on the top surface of the sand box 4 is compacted. Then, the piezoelectric or thermal foam nozzle in the printing host 1 accurately sprays the liquid adhesive to a specific area of the sand layer according to the three-dimensional model cross-sectional data, and the sand grains are combined with the adhesive to solidify and form a shape. Through the setting of the sand scraping member 81, when the sand discharging member 73 and the sand discharging channel 72 lay the sand powder on the top surface of the sand box 4, the sand powder layer on the top surface of the sand box 4 is leveled and scraped in advance, so as to achieve the effect of ensuring that the top surface of the sand box 4 is in a horizontal state when the sand discharging channel 72 lays the sand powder, and avoiding the problem that there is too much sand powder at a certain position on the top surface of the sand box 4. After the pressure roller rolls on this position, the top surface of the sand box 4 becomes uneven. This solves the problem that during the multi-layer printing process of the sand box 4, there is likely to be too much sand powder at a certain position, and when the pressure roller rolls on this position, it is likely that the sand layer is not tightly compacted, which may easily cause a certain part of the printed model to become loose.

[0022] Embodiment 2: The difference from the above Embodiment 1 is that, referring to Figures 1 - 4 , for the above printing host 1, the sand box 4 enters the printing host 1 through the conveyor 2. The moving inner chamber 6 is arranged in the printing host 1 and is located at the top of the sand box 4. The moving inner chamber 6 moves back and forth in the printing host 1. After the sand box 4 finishes working, it is transported to the sand cleaning machine 3 by the conveyor 2 for demolding. Specifically, the sand box 4 is moved into the printing host 1 by the conveyor 2, and a sand powder layer is laid on the top surface of the sand box 4 through the sand laying device 5. Then, the piezoelectric or thermal foam nozzle in the printing host 1 accurately sprays the liquid adhesive to a specific area of the sand layer according to the three-dimensional model cross-sectional data, and the sand grains are combined with the adhesive to solidify and form a shape. After the model in the sand box 4 is formed, it is transported to the sand cleaning machine 3 by the conveyor 2 for demolding.

[0023] Embodiment 3: The difference from the above Embodiment 2 is that, referring to Figures 5 - 10For the sand discharging member 73 described above, the sand discharging member 73 includes a rotating shaft 731. A plurality of abutting plates 732 are fixedly connected to the outer periphery of the rotating shaft 731. One end of the plurality of abutting plates 732 is in contact with the inner wall of the sand discharging channel 72. A servo motor 733 is fixedly connected to one side of the sand discharging channel 72. The output end of the servo motor 733 is fixedly connected to one end of the rotating shaft 731. The other end of the rotating shaft 731 extends to the outer periphery of the sand discharging channel 72; The sand scraping member 81 includes a scraping plate 811. The scraping plate 811 is fixedly installed in the moving inner bin 6. Scraper groups 812 are provided at both ends of one side of the scraping plate 811. A driving group 813 is arranged between the two scraper groups 812 to drive the two scraper groups 812 to operate; The scraper group 812 includes a first toothed belt 8121. Two first gears 8122 are rotatably connected to one side of the scraping plate 811 through bearings. The first toothed belt 8121 is meshed with the two first gears 8122. A scraping block 8123 is fixedly connected to the outer surface of the first toothed belt 8121; The driving group 813 includes a plurality of meshing second gears 8131. A bracket 8132 is fixedly connected to the side of the scraping plate 811 away from the first toothed belt 8121. The plurality of meshing second gears 8131 are rotatably arranged on the bracket 8132 through bearings. Connecting shafts 8133 are fixedly connected to one side of two of the second gears 8131. The two connecting shafts 8133 are respectively fixedly connected to two of the first gears 8122; The transmission member 9 includes a worm gear 91 and a worm 92. A movable rod 93 is rotatably connected between the scraping plate 811 and the sand discharging channel 72 through a bearing seat. The worm 92 is fixedly installed on the movable rod 93. The worm gear 91 is fixedly installed on one of the connecting shafts 8133. The worm gear 91 is meshed with the worm 92. Third gears 94 are fixedly connected to one end of the movable rod 93 and the rotating shaft 731 respectively. A second toothed belt 95 meshing with the third gears 94 is provided on the two third gears 94; Specifically, the servo motor 733 operates to drive the rotating shaft 731 to rotate, thereby driving multiple abutting plates 732 to rotate. When the abutting plates 732 rotate, the previous abutting plate 732 disengages from the inner wall of the sand outlet channel 72, causing the sand powder on the top surface of the previous abutting plate 732 to enter below the sand outlet channel 72, thus achieving the effect of uniform sand discharge in the sand outlet channel 72. When the rotating shaft 731 rotates, it drives the first gear 8122 to rotate. Through the meshing connection between the second toothed belt 95 and the two third gears 94, it drives the other third gear 94 to rotate, thereby driving the rotating rod 828 and the worm 92 fixedly connected to the rotating rod 828 to rotate. Through the meshing connection between the worm 92 and the worm wheel 91, it drives the worm wheel 91 to rotate, thereby driving one of the second gears 8131 to rotate. Through the meshing connection between the multiple second gears 8131, it drives the other second gears 8131 to rotate, and further drives one of the first gears 8122 in the two first toothed belts 8121 to rotate in the opposite direction, thereby driving the first toothed belt 8121 to rotate, and further driving the scraping block 8123 outside the first toothed belt 8121 to rotate. The excess sand powder scraped by the scraping block 8123 when the scraper 811 advances is pushed to both sides of the sand box 4, and the waste sand collection device in the printing host 1 transports the excess sand powder out, avoiding the problem that when the scraper 811 operates, too much sand powder accumulates on both sides of the inner cavity of the moving inner bin 6, and when the moving inner bin 6 moves back and forth, the excess sand powder returns to the top surface of the sand box 4.

[0024] Embodiment 4: The difference from the above Embodiment 3 is that, referring to Figures 5 - 12 , for the above-mentioned compaction member 82, the compaction member 82 includes a compaction plate 821. A support 822 is fixedly connected to one side of the sand outlet channel 72. Guide shafts 823 are fixedly connected to both sides of the support 822. A vertical plate 824 is fixedly connected to the top of the compaction plate 821. Guide blocks 825 are fixedly connected to both sides of the top of the vertical plate 824. The guide blocks 825 are slidably arranged on the guide shafts 823. Springs 826 are fixedly connected to the bottoms of the guide blocks 825. The springs 826 are sleeved on the guide shafts 823. A cross plate 827 is fixedly connected to the top of the vertical plate 824. A rotating rod 828 is rotatably connected to one side of the sand outlet channel 72 through a bearing seat. A plurality of fixing plates 829 are fixedly connected to the outer periphery of the rotating rod 828. The fixing plates 829 are in contact with the cross plate 827. When the fixing plates 829 rotate, they drive the cross plate 827 to move downward; The transmission member 9 further includes a third toothed belt 96. Fourth gears 97 are fixedly connected to one end of the rotating shaft 731 and one end of the rotating rod 828. The fourth gear 97 at one end of the rotating shaft 731 is arranged on one side of the third gear 94. The third toothed belt 96 is arranged on the outer periphery of the two fourth gears 97 and is meshed with the fourth gears 97; Specifically, when the servo motor 733 drives the rotating shaft 731 to rotate, it drives the fourth gear 97 to rotate. Through the meshing connection between the third toothed belt 96 and the two fourth gears 97, it drives the other fourth gear 97 to rotate, thereby driving the fourth gear 97 connected to the rotating rod 828 to rotate, and further driving the rotating rod 828 to rotate, thereby driving the fixing plate 829 on the outer periphery of the rotating rod 828 to rotate. Through the socket connection between the guide block 825 and the guide shaft 823, when one of the fixing plates 829 rotates downward, it drives the cross plate 827 to move downward, so that the spring 826 is in a compressed state. When one of the fixing plates 829 rotates to the vertical state, it drives the compaction plate 821 to compact the sand powder layer on the top surface of the sand box 4. When the vertical fixing plate 829 rotates upward, the fixing plate 829 disengages from the cross plate 827, and the spring 826 restores its elasticity, thereby driving the compaction plate 821 to move upward, thus forming a cycle, enabling the compaction plate 821 to move up and down repeatedly and compact the sand powder layer on the top surface of the sand box 4.

[0025] Embodiment 5: The difference from the above Embodiment 4 is as follows. Refer to Figures 5 - 12 , for the above-mentioned rolling member 83, the rolling member 83 includes a movable roller 831. One side of the support 822 is fixedly connected with a right-angle plate 832, and the bottom of the right-angle plate 832 is fixedly connected with a fixed seat 833. The movable roller 831 is rotatably arranged at the bottom of the fixed seat 833 through a bearing; The transmission member 9 further includes two fifth gears 98. One of the fifth gears 98 is rotatably arranged on the fixed seat 833 through a bearing and is fixedly connected to one end of the movable roller 831. The other fifth gear 98 is fixedly installed on the rotating rod 828 and is located on one side of the fourth gear 97. A fourth toothed belt 99 meshing with the fifth gears 98 is provided on the two fifth gears 98; Specifically, when the rotating rod 828 rotates, it drives one of the fifth gears 98 to rotate. Through the meshing connection between the fourth toothed belt 99 and the two fifth gears 98, it drives the fifth gear 98 on one side of the fixed seat 833 to rotate, thereby driving the movable roller 831 to rotate. When the movable roller 831 rolls, it rolls and flattens the indentation generated after the compaction plate 821 is compacted, so as to ensure that the sand powder layer remains in a flat state during the process of the compaction member 82 compacting the sand powder layer.

[0026] Embodiment 6: Refer to Figures 1 - 12 , this embodiment discloses a method for laying materials of a 3D sand mold printer, which applies a control device for laying materials of a 3D sand mold printer. The specific steps are as follows: The sand box 4 is moved into the printing host 1 through the conveyor 2. The sand laying device 5 lays a layer of sand powder. During the laying process, the sand scraping member 81 first contacts the sand box 4 and scrapes off the uneven top surface of the sand box 4 and the excess sand powder. When the sand discharging channel 72 moves to the top surface of the sand box 4, the sand discharging member 73 operates and lays a layer of sand powder on the top surface of the sand box 4 through the sand discharging channel 72. When the sand discharging member 73 operates, it drives the transmission member 9 to operate, thereby driving the sand scraping member 81 to operate. At this time, the sand scraping member 81 pushes the excess sand powder on the top surface of the sand box 4 to both sides of the sand box 4, and at the same time drives the compaction member 82 and the rolling member 83 to operate. Through the arrangement of the compaction member 82 and the rolling member, the sand powder laid on the top surface of the sand box 4 is compacted. Then, the piezoelectric or thermal foaming nozzle in the printing host 1 accurately sprays the liquid adhesive to a specific area of the sand layer according to the three-dimensional model cross-sectional data, and the sand grains are combined with the adhesive to solidify and form a shape.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A feeding control device for a 3D sand mold printer, comprising a printing host, a conveyor, a sand cleaning machine and a sand box, characterized in that: A sand laying device is arranged in the printing host, and the sand laying device includes a moving inner bin, a sand blasting assembly and an auxiliary assembly arranged on both sides inside the moving inner bin; The sand blasting assembly includes a sand storage bin and a sand outlet channel arranged at the bottom of the sand storage bin, and a sand discharging member is arranged in the sand outlet channel; The auxiliary assembly includes a sand scraping member, a compaction member and a rolling member. The sand scraping member is arranged between the inner wall of the moving inner bin and the sand outlet channel. The compaction member is arranged at the opposite of the advancing direction of the sand outlet channel, and the rolling member is arranged at the opposite of the advancing direction of the compaction member; A transmission member is arranged between the auxiliary assembly and the sand discharging member. When the sand discharging member operates, the sand scraping member scrapes on the top surface of the sand box as the moving inner bin moves, the compaction member vibrates up and down on the top surface of the sand box, and the rolling member rolls on the top surface of the sand box as the moving inner bin moves.

2. The feeding control device of a 3D sand mold printer according to claim 1, characterized in that: The sand box enters the printing host through a conveyor. The moving inner bin is arranged in the printing host and located at the top of the sand box. The moving inner bin moves back and forth in the printing host. After the sand box finishes working, it is transported to a sand cleaning machine by the conveyor for demoulding.

3. The feeding control device of a 3D sand mold printer according to claim 2, characterized in that: The sand discharging member includes a rotating shaft, and a plurality of pressing plates are fixedly connected to the outer periphery of the rotating shaft. One ends of the plurality of pressing plates are in contact with the inner wall of the sand outlet channel. A servo motor is fixedly connected to one side of the sand outlet channel, the output end of the servo motor is fixedly connected to one end of the rotating shaft, and the other end of the rotating shaft extends to the outer periphery of the sand outlet channel.

4. The feeding control device of a 3D sand mold printer according to claim 3, wherein: The sand scraping member includes a scraping plate, the scraping plate is fixedly installed in the moving inner bin, and scraping groups are arranged at both ends of one side of the scraping plate. A driving group is arranged between the two scraping groups to drive the two scraping groups to operate; The scraping group includes a first toothed belt. Two first gears are rotatably connected to one side of the scraping plate through bearings. The first toothed belt is meshed with the two first gears, and scraping blocks are fixedly connected to the outer surface of the first toothed belt; The driving group includes a plurality of meshing second gears. A bracket is fixedly connected to the side of the scraping plate away from the first toothed belt. The plurality of meshing second gears are rotatably arranged on the bracket through bearings. Connecting shafts are fixedly connected to one sides of two of the second gears, and the two connecting shafts are respectively fixedly connected to two of the first gears.

5. The feeding control device of a 3D sand mold printer according to claim 4, wherein: The transmission member includes a worm gear and a worm. A movable rod is rotatably connected between the scraping plate and the sand outlet channel through a bearing seat. The worm is fixedly installed on the movable rod. The worm gear is fixedly installed on one of the connecting shafts. The worm gear is meshed with the worm. Third gears are fixedly connected to one ends of the movable rod and the rotating shaft, and a second toothed belt meshing with the third gears is arranged on the two third gears.

6. The feeding control device of a 3D sand mold printer according to claim 5, characterized in that: The compaction member includes a compaction plate. One side of the sand discharge channel is fixedly connected with a support. Both sides of the support are fixedly connected with guide shafts. The top of the compaction plate is fixedly connected with a vertical plate. Both sides of the top of the vertical plate are fixedly connected with guide blocks. The guide blocks are slidably arranged on the guide shafts. The bottom of the guide blocks is fixedly connected with springs. The springs are sleeved on the guide shafts. The top of the vertical plate is fixedly connected with a horizontal plate. One side of the sand discharge channel is rotatably connected with a rotating rod through a bearing seat. A plurality of fixing plates are fixedly connected to the outer periphery of the rotating rod. The fixing plates are in contact with the horizontal plate. When the fixing plates rotate, the horizontal plate is driven to move downward.

7. The feeding control device of a 3D sand mold printer according to claim 6, characterized in that: The transmission member further includes a third toothed belt. Fourth gears are fixedly connected to both the rotating shaft and one end of the rotating rod. The fourth gear at one end of the rotating shaft is arranged on one side of the third gear. The third toothed belt is arranged on the outer peripheries of the two fourth gears and is meshed with the fourth gears.

8. The feeding control device of a 3D sand mold printer according to claim 7, characterized in that: The rolling member includes a movable roller. One side of the support is fixedly connected with a right-angled plate. The bottom of the right-angled plate is fixedly connected with a fixed seat. The movable roller is rotatably arranged at the bottom of the fixed seat through a bearing.

9. The feeding control device of a 3D sand mold printer according to claim 8, characterized in that: The transmission member further includes two fifth gears. One of the fifth gears is rotatably arranged on the fixed seat through a bearing and is fixedly connected to one end of the movable roller. The other fifth gear is fixedly installed on the rotating rod and is located on one side of the fourth gear. A fourth toothed belt meshed with the fifth gears is arranged on the two fifth gears.

10. A method for laying materials of a 3D sand mold printer, characterized in that: Applying a 3D sand mold printer material laying control device according to any one of claims 1-9, the specific steps are as follows: The sand box is moved into the printing host by a conveyor. The sand laying device lays a sand powder layer. During the laying process, the sand scraping member first contacts the sand box and scrapes off the unevenness and excess sand powder on the top surface of the sand box. When the sand discharge channel moves to the top surface of the sand box, the sand discharging member operates and lays a sand powder layer on the top surface of the sand box through the sand discharge channel. When the sand discharging member operates, it drives the transmission member to operate, thereby driving the sand scraping member to operate. At this time, the sand scraping member pushes the excess sand powder on the top surface of the sand box to both sides of the sand box, and at the same time drives the compaction member and the rolling member to operate. Through the settings of the compaction member and the rolling member, the sand powder laid on the top surface of the sand box is compacted. Then, the piezoelectric or thermal foam nozzle in the printing host accurately sprays the liquid adhesive to a specific area of the sand layer according to the three-dimensional model cross-sectional data, and the sand grains are combined with the adhesive to solidify and form.

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