Sand cleaning device of 3D printing system

Abstract

The invention discloses a sand cleaning device of a 3D printing system, which comprises a sand cleaning station main body, the sand cleaning station main body comprises two oppositely arranged sand cleaning boxes, a spacing area for movement of the sand boxes is reserved between the two sand cleaning boxes, the top of each sand cleaning box is provided with a sand filtering assembly, and the sand filtering assemblies can be rotatably opened relative to the sand cleaning boxes. Sand baffles are installed at the two ends of the top of the sand cleaning station body respectively, a buffering sand discharging assembly and a sand collecting temporary storage bin are fixedly installed in the sand cleaning box, the buffering sand discharging assembly comprises a sand discharging opening, the sand collecting temporary storage bin is located under the sand discharging opening, a vibration device is fixed to the outer side wall of the sand collecting temporary storage bin, and the sand collecting temporary storage bin is connected with a sand suction system. According to the sand cleaning device of the 3D printing system, sand cleaning can be rapidly and efficiently completed, the labor intensity is relieved, and the sand mold box discharging speed is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a sand cleaning device for a 3D printing system. Background Art

[0002] When sand mold 3D printing technology is applied in the foundry industry, its efficient printing method effectively shortens the development time of new castings, saves development costs, and promotes development. China's foundry equipment is showing an upward trend year by year, and the required casting output is bound to increase. The increase in casting demand will promote the rapid development of sand mold 3D printing equipment.

[0003] After the 3D printing equipment completes printing, the waste sand in the sand box needs to be cleaned before the sand mold can be taken out. The existing sand cleaning methods mainly include:

[0004] 1. Lift the bottom plate of the working box, push the sand core out of the working box, and then manually clean the waste sand in the sand box. Generally, the sand is sucked up by a suction machine. This sand cleaning method is complicated, has high labor costs, and is relatively slow.

[0005] 2. Directly put the sand on the ground and then manually clean and collect it. Although this will improve efficiency to a certain extent, it will pollute the ground and increase labor intensity.

[0006] In summary, the current sand mold 3D printing process has problems of low sand cleaning efficiency and high labor intensity. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a sand cleaning device for a 3D printing system, which can quickly and efficiently complete sand cleaning, reduce labor intensity, and increase the speed of sand mold out of the box.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A sand cleaning device for a 3D printing system comprises a sand cleaning station body, wherein the sand cleaning station body comprises two sand cleaning boxes arranged opposite to each other, a spacing area for the sand boxes to move is reserved between the two sand cleaning boxes, a sand filter assembly is installed on the top of the sand cleaning box, and the sand filter assembly can be rotated and opened relative to the sand cleaning box, and sand retaining plates are installed at both ends of the top of the sand cleaning station body,

[0010] A buffer sand discharge component and a sand collecting buffer bin are fixedly installed in the sand cleaning box. The buffer sand discharge component includes a sand discharge port. The sand collecting buffer bin is located directly below the sand discharge port. A vibration device is fixed on the outer wall of the sand collecting buffer bin. The sand collecting buffer bin is connected to a sand suction system.

[0011] Preferably: the sand cleaning box includes a first long box board, a second long box board, a first short box board and a second short box board, the first long box board and the second long box board are arranged opposite to each other, the first short box board is fixedly connected to the first long box board and the second long box board respectively, the second short box board is fixedly connected to the first long box board and the second long box board respectively, and one side end of the sand filter assembly is connected to the top of the first long box board by a hinge.

[0012] Preferably: the sand filter assembly includes a grid cover and a filter screen, the filter screen is fixed to the grid cover, the outer end of the grid cover is connected to the top of the first long box plate by a hinge, and the grid cover is provided with a grid handle for facilitating opening and flipping the grid cover, and the grid handle is close to the inner end of the grid cover.

[0013] Preferably: the buffer sand discharge assembly includes a first inclined guide plate and a second inclined guide plate, the upper end of the first inclined guide plate is fixed on the inner wall of the first long box plate, the upper end of the second inclined guide plate is fixed on the inner wall of the second long box plate, the first inclined guide plate is inclined toward the direction of the second inclined guide plate, the second inclined guide plate is inclined toward the direction of the first inclined guide plate, and the sand discharge port is arranged between the first inclined guide plate and the second inclined guide plate.

[0014] Preferably, the lower end of the first inclined guide plate is staggered with the lower end of the second inclined guide plate.

[0015] Preferably: a first support member for supporting the first inclined guide plate is fixed on the inner wall of the first long box board, and a second support member for supporting the second inclined guide plate is fixed on the inner wall of the second long box board.

[0016] Preferably: the sand collecting and buffering bin comprises a sand collecting hopper and a sand suction duct located below the sand collecting hopper, the two sides of the sand collecting hopper are respectively fixedly connected to the first long box board and the second long box board, the lower end of the sand collecting hopper is communicated with the sand suction duct through a sand inlet gap, one end of the sand suction duct is closed, and the other end is connected to the sand suction system.

[0017] Preferably: a plurality of partitions are arranged in the sand collecting hopper, and the plurality of partitions divide the sand collecting hopper into a plurality of sub-sand hoppers.

[0018] Preferably: an adjustment plate is installed on the inner side wall of the lower end of the sand dividing hopper, and the adjustment plate is used to adjust the size of the sand inlet gap.

[0019] Preferably, the adjusting plate is provided with an adjusting long hole, the inner side wall of the lower end of the sand dividing hopper is provided with a bolt mounting hole, and the adjusting bolt passes through the adjusting long hole and the bolt mounting hole and is fixed in cooperation with a nut.

[0020] After adopting the above technical solution, the beneficial effects of the present invention are:

[0021] The sand cleaning device of the 3D printing system of the present invention has a spacing area for the movement of the sand boxes left between the two sand cleaning boxes, a sand filter assembly is installed on the top of the sand cleaning box, the sand filter assembly can be rotatably opened relative to the sand cleaning box, sand retaining plates are respectively installed on the two ends of the top of the sand cleaning station body, a buffer sand discharge assembly and a sand collecting cache bin are fixedly installed in the sand cleaning box, the buffer sand discharge assembly includes a sand discharge port, the sand collecting cache bin is located directly below the sand discharge port, a vibration device is fixed on the outer side wall of the sand collecting cache bin, and the sand collecting cache bin is connected to a sand suction system.

[0022] The sand filter component breaks up the large sand blocks that pass through and filters them carefully, which can prevent the agglomerated sand from falling into the sand collecting buffer bin of the sand cleaning box. The filtered sand that falls into the sand collecting buffer bin is easily sucked away completely. The sand filter component can be rotated to open relative to the sand cleaning box. When the internal components of the sand cleaning box fail, such as sand blockage, or when the lower sand buffer component and the sand collecting buffer bin are damaged, the sand filter component can be rotated to open the sand cleaning box to troubleshoot.

[0023] The sand retaining plate on the top of the sand cleaning station body can prevent waste sand from falling outside the sand cleaning station body during sand cleaning.

[0024] The sand buffering component can reduce the falling speed and amount of sand to ensure that the relevant components of the sand collecting and buffering bin will not be blocked by sand.

[0025] When the vibrator vibrates, the wall of the sand collecting and buffering bin will vibrate continuously, thereby greatly improving the fluidity of the sand, thereby improving the sand falling efficiency by increasing the fluidity of the sand.

[0026] After the 3D printing equipment completes printing, the sand box is moved to the sand cleaning station for pickup. That is, the sand box carries the formed sand core into the interval area between the left and right sand cleaning boxes. The bottom plate of the sand box can be lifted up by the lifting mechanism, and the waste sand on the bottom plate of the sand box falls into the sand filter assembly on the top of the left and right sand cleaning boxes. The sand filter assembly can break up the large sand blocks that pass through and filter them carefully. After passing through the sand filter assembly, the sand falls onto the buffer lower sand assembly and is buffered, and then falls through the sand lower port. The buffered sand will continue to fall into the sand collecting buffer bin in small quantities. The vibration device greatly improves the fluidity of the sand and improves the sand falling efficiency. Finally, it is sucked up by the sand suction system and collected in the waste sand bucket.

[0027] In summary, the sand cleaning device of the 3D printing system of the present invention can quickly and efficiently complete sand cleaning, reduce labor intensity, and increase the speed of sand mold out of the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a structural schematic diagram of a sand cleaning device of a 3D printing system of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the sand cleaning device of the 3D printing system of the present invention when the first short box plate is hidden;

[0030] Figure 3 is a cross-sectional view of a sand cleaning device of a 3D printing system of the present invention;

[0031] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at center A;

[0032] Figure 5 It is a structural schematic diagram of a sand collecting and buffering bin of a sand cleaning device of a 3D printing system of the present invention;

[0033] Figure 1 Middle: Z, main body of sand cleaning station; 1, left sand cleaning box; 101, first long box board; 102, second long box board; 103, first short box board; 104, second short box board; 1011, hinge; 1012, grid handle; Q, interval area; 2, right sand cleaning box; 200, sand filter assembly; 3, sand retaining plate; 4, buffer sand discharge assembly; 401, sand discharge port; 402, first inclined guide plate; 403, second inclined guide plate; 404, first support member; 405, second support member; 5, sand collection buffer bin; 501, vibration device; 502, sand collecting hopper; 503, sand suction duct; 504, sand inlet gap; 505, partition; 506, adjustment plate; 507, adjustment bolt; 6, pin and socket structure; M, front end; H, rear end. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the claims attached to the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0037] like Figures 1 to 3 The sand cleaning device of the 3D printing system shown includes a sand cleaning station body Z, which includes two sand cleaning boxes arranged opposite to each other, and a spacing area Q for the sand boxes to move is left between the two sand cleaning boxes. The two sand cleaning boxes are respectively a left sand cleaning box 1 and a right sand cleaning box 2, and a sand filter assembly 200 is installed on the top of the left sand cleaning box 1 and the right sand cleaning box 2. During sand cleaning, the sand box (not shown in the figure) carries the formed sand core into the spacing area Q between the left sand cleaning box 1 and the right sand cleaning box 2, and the bottom plate of the sand box can be lifted up and gradually raised by the lifting mechanism, and the bottom plate of the sand box can be raised to the highest level with the sand filter assembly 200 on the top of the left sand cleaning box 1 and the sand filter assembly 200 on the top of the right sand cleaning box 2. The lifting mechanism is a prior art and will not be described in detail here.

[0038] The sand filter assembly 200 can be rotated to open the sand cleaning box. When the internal components of the sand cleaning box fail, such as sand blockage, or the sand buffer assembly and the sand collecting and caching bin are damaged, the sand filter assembly 200 can be rotated to open the sand cleaning box to troubleshoot.

[0039] Sand retaining plates 3 are respectively installed at both ends of the top of the sand cleaning station body Z, and the sand retaining plates 3 can prevent waste sand from falling outside the sand cleaning station body Z during sand cleaning.

[0040] A buffer sand discharge assembly 4 and a sand collection buffer bin 5 are fixedly installed in the sand cleaning box. The buffer sand discharge assembly 4 includes a sand discharge port 401. The sand collection buffer bin 5 is located directly below the sand discharge port 401. A vibration device 501 is fixed on the outer wall of the sand collection buffer bin 5. The sand collection buffer bin 5 is connected to a sand suction system. The sand suction system adopts a vacuum sand suction machine, or a vacuum sand suction pump. The vacuum sand suction machine or the vacuum sand suction pump is connected to the above-mentioned sand collection buffer bin 5 through a suction pipe. The sand will be sucked into the waste sand bucket through the suction pipe.

[0041] The sand buffering component 4 can reduce the falling speed and amount of the sand to ensure that the relevant components of the sand collecting and buffering bin 5 will not be blocked by the sand.

[0042] In some embodiments, the vibration device 501 preferably adopts a vibrator. When the vibrator vibrates, the wall of the sand collecting and buffering bin 5 is continuously vibrated, thereby greatly improving the fluidity of the sand, and improving the sand falling efficiency by increasing the fluidity of the sand.

[0043] In some embodiments, Figure 1 and Figure 2 As shown, the sand cleaning box includes a first long box board 101, a second long box board 102, a first short box board 103 and a second short box board 104, the first long box board 101 and the second long box board 102 are arranged opposite to each other, the first short box board 103 is fixedly connected to the first long box board 101 and the second long box board 102, the second short box board 104 is fixedly connected to the first long box board 101 and the second long box board 102, and one side end of the sand filter assembly 200 is connected to the top of the first long box board 101 through a hinge. The power control box is fixedly installed on the first short box board 103 of the right sand cleaning box 2.

[0044] The sand filter assembly 200 includes a grid cover and a filter screen, the filter screen is fixed to the grid cover, the outer end of the grid cover is connected to the top of the first long box board 101 by a hinge 1011, and a grid handle 1012 is provided on the grid cover for facilitating the opening and flipping of the grid cover, and the grid handle 1012 is close to the inner end of the grid cover. The grid cover and the filter screen can break up the large sand blocks passing through and filter them carefully, so as to prevent the agglomerated sand from falling into the sand collecting buffer 5 of the sand cleaning box, and the filtered sand falling into the sand collecting buffer 5 is easy to be completely sucked away. Of course, the sand filter assembly 200 can also be provided with only the grid cover. In this way, the large sand blocks can also be broken up and roughly filtered. The grid handle 1012 is preferably a concave handle, and of course it can also be set as a protruding handle. It is convenient to rotate and open the sand filter assembly 200. The grid cover can be composed of multiple pieces, which is convenient for rotation and maintenance. Of course, an integrated grid cover can also be used. Of course, the filter can be set as one piece or composed of multiple pieces.

[0045] In some embodiments, Figure 2 and Figure 3As shown, the buffer sand lowering assembly 4 includes a first inclined guide plate 402 and a second inclined guide plate 403, the upper end of the first inclined guide plate 402 is fixed on the inner wall of the first long box plate 101, the upper end of the second inclined guide plate 403 is fixed on the inner wall of the second long box plate 102, the first inclined guide plate 402 is inclined in the direction of the second inclined guide plate 403, the second inclined guide plate 403 is inclined in the direction of the first inclined guide plate 402, and the first inclined guide plate 402 and the second inclined guide plate 403 surround the sand lowering opening 401. The arrangement of the first inclined guide plate 402 and the second inclined guide plate 403 can buffer the impact force of the falling sand. On the one hand, it can prevent the sand from strongly impacting the first long box plate 101, the second long box plate 102 and the sand collecting buffer bin 5; on the other hand, the sand passing through the first inclined guide plate 402 and the first long box plate 101 will continue to fall into the sand collecting buffer bin 5 in small quantities, preventing too much sand from falling into the sand collecting buffer bin 5 each time, resulting in the vacuum sand suction machine or the vacuum sand suction pump being unable to promptly and comprehensively absorb the waste sand, which will easily clog the sand inlet gap 504 and the sand suction duct 503 of the sand collecting buffer bin 5 after a long time.

[0046] like Figure 3 As shown, the angle between the first inclined guide plate 402 and the first long box plate 101 is α1, and the angle between the second inclined guide plate 403 and the second long box plate 102 is α2, α1>α2. Preferably, one embodiment has α1=39°, α2=35°.

[0047] In some embodiments, Figure 3 As shown, the lower end of the first inclined guide plate 402 and the lower end of the second inclined guide plate 403 are arranged in a staggered manner. The lower end of the first inclined guide plate 402 may be located higher than the lower end of the second inclined guide plate 403. Alternatively, the lower end of the first inclined guide plate 402 may be located lower than the lower end of the second inclined guide plate 403. In this way, all sand passing through the lower sand opening 401 can be buffered, and even sand falling from the middle of the lower sand opening 401 will be buffered by the end of the inclined guide plate located at the bottom. In addition, the sand is not easy to block the lower sand opening 401. If the lower end of the first inclined guide plate 402 is located higher than the lower end of the second inclined guide plate 403, the sand falling from the middle of the lower sand opening 401 will also be buffered by the lower end of the second inclined guide plate 403.

[0048] Of course, the lower end of the first inclined guide plate 402 may be flush with the lower end of the second inclined guide plate 403. Although the first inclined guide plate 402 and the second inclined guide plate 403 can buffer the sand in this way, the sand falling from the middle of the lower sand port 401 will not be buffered, and if the amount of sand falling from the sand filter assembly 200 is too large, the lower sand port 401 is likely to be blocked.

[0049] In some embodiments, a first support member 404 supporting the first inclined guide plate 402 is fixed on the inner wall of the first long box board 101, and a second support member 405 supporting the second inclined guide plate 403 is fixed on the inner wall of the second long box board 102. Such support can prevent the first inclined guide plate 402 and the second inclined guide plate 403 from being easily deformed, and also prevent the impact force of sand from causing the upper end of the first inclined guide plate 402 to separate from the first long box board 101, and also prevent the upper end of the second inclined guide plate 403 from being separated from the second long box board 102.

[0050] In some embodiments, Figure 2 and Figure 3 As shown, the sand collecting and buffering bin 5 includes a sand collecting hopper 502 and a sand suction conduit 503 located below the sand collecting hopper 502. The sand collecting hopper 502 is funnel-shaped to facilitate the sand to fall. The two sides of the sand collecting hopper 502 are respectively fixedly connected to the first long box board 101 and the second long box board 102. The lower end of the sand collecting hopper 502 is connected to the sand suction conduit 503 through a sand inlet gap 504. One end of the sand suction conduit 503 is closed, and the other end is connected to the sand suction system. Figure 2 In the figure, the front end M of the sand suction conduit 503 is closed, and the rear end H is used to connect to the sand suction system.

[0051] like Figure 5 As shown, a plurality of partitions 505 are provided in the sand collecting hopper 502, and the plurality of partitions 505 divide the sand collecting hopper 502 into a plurality of sand sub-hoppers. The partitions 505 provided in the sand collecting hopper 502 have a better effect than not providing the partitions 505. If the partitions 505 are not provided, the falling sand may be concentrated at the rear end H near the sand suction conduit 503, the sand suction efficiency is low, and the probability of sand blockage is high. After the partitions 505 are provided, the sand falling into the sand collecting hopper 502 can be blocked by the partitions 505 and roughly evenly divided into each sand sub-hopper, which can improve the sand suction efficiency and is not easy to cause sand blockage.

[0052] In some embodiments, Figure 4 As shown, it is preferred that an adjustment plate 506 is installed on the inner side wall of the lower end of the sand dividing hopper, and the adjustment plate 506 is used to adjust the size of the sand inlet gap 504. To ensure that the sand suction system can form a sufficient vacuum when sucking sand. The connection structure between the adjustment plate 506 and the sand dividing hopper can be: an adjustment long hole is opened on the adjustment plate 506, and a bolt mounting hole is opened on the inner side wall of the lower end of the sand dividing hopper. The adjustment bolt 507 passes through the adjustment long hole and the bolt mounting hole and is fixed with a nut. Of course, other adjustment structures can also be used. In addition, a handle is fixed on the adjustment plate 506 to facilitate the assembly worker to hold the adjustment plate 506 by hand when assembling the adjustment plate 506.

[0053] In some embodiments, the sand retaining plate 3 is preferably rotatable relative to the sand cleaning station body Z. Figure 2As shown, one end of the sand retaining plate 3 is hinged to the top of the right sand cleaning box 2 through a hinge shaft, and the other end of the sand retaining plate 3 is plugged into the top of the left sand cleaning box 1 through a latch and socket structure 6. Pulling out the latch can make the sand retaining plate 3 rotate around the hinge shaft, thereby facilitating manual and rapid adjustment to a suitable position. Of course, one end of the sand retaining plate 3 can also be installed on the top of the right sand cleaning box 2 through a hinge, and the other end can be plugged into the top of the left sand cleaning box 1 through a latch and socket structure 6.

[0054] The specific working principle of the sand cleaning device of the 3D printing system of the present invention is:

[0055] After the 3D printing equipment completes printing, the sand box is moved to the sand cleaning station for pickup, that is, the sand box carrying the formed sand core enters the interval area Q between the left sand cleaning box 1 and the right sand cleaning box 2, and the bottom plate of the sand box can be lifted up by the lifting mechanism, and the waste sand on the bottom plate of the sand box falls into the sand filter assembly 200 on the top of the left sand cleaning box 1 and the sand filter assembly 200 on the top of the right sand cleaning box 2. After passing through the grid cover plate and the filter screen of the sand filter assembly 200, the sand falls onto the first inclined guide plate 402 and the second inclined guide plate 403 to be buffered, and then falls through the lower sand port 401. The buffered sand will continue to fall into the sand collecting hopper 502 in small quantities, and then be sucked into the sand suction duct 503 through the sand inlet gap 504, and finally be sucked by the sand suction system and collected in the waste sand bucket.

[0056] The sand cleaning device of the 3D printing system of the present invention can quickly and efficiently complete sand cleaning, reduce labor intensity, and increase the speed of sand mold out of the box.

[0057] The present invention is not limited to the above embodiments, and all improvements made based on the concept, principle, structure and method of the present invention are within the protection scope of the present invention.

Claims

1. A sand cleaning device for a 3D printing system, comprising a sand cleaning station body, characterized in that: The main body of the sand cleaning station includes two sand cleaning boxes arranged opposite to each other, and a spacing area for the sand boxes to move is reserved between the two sand cleaning boxes. A sand filter assembly is installed on the top of the sand cleaning box, and the sand filter assembly can be rotated and opened relative to the sand cleaning box. Sand retaining plates are installed at both ends of the top of the main body of the sand cleaning station. A buffer sand discharge component and a sand collecting buffer bin are fixedly installed in the sand cleaning box. The buffer sand discharge component includes a sand discharge port. The sand collecting buffer bin is located directly below the sand discharge port. A vibration device is fixed on the outer wall of the sand collecting buffer bin. The sand collecting buffer bin is connected to a sand suction system.

2. A sand cleaning device for a 3D printing system according to claim 1, characterized in that: The sand cleaning box includes a first long box board, a second long box board, a first short box board and a second short box board. The first long box board and the second long box board are arranged opposite to each other. The first short box board is fixedly connected to the first long box board and the second long box board respectively. The second short box board is fixedly connected to the first long box board and the second long box board respectively. One side end of the sand filter assembly is connected to the top of the first long box board by a hinge.

3. A sand cleaning device for a 3D printing system according to claim 2, characterized in that: The sand filter assembly includes a grid cover and a filter screen, the filter screen is fixed to the grid cover, the outer end of the grid cover is connected to the top of the first long box plate by a hinge, and a grid handle is provided on the grid cover for easy opening and flipping of the grid cover, and the grid handle is close to the inner end of the grid cover.

4. A sand cleaning device for a 3D printing system as claimed in claim 2, characterized in that: The buffer sand discharge assembly includes a first inclined guide plate and a second inclined guide plate, the upper end of the first inclined guide plate is fixed to the inner wall of the first long box plate, the upper end of the second inclined guide plate is fixed to the inner wall of the second long box plate, the first inclined guide plate is inclined toward the direction of the second inclined guide plate, the second inclined guide plate is inclined toward the direction of the first inclined guide plate, and the sand discharge port is arranged between the first inclined guide plate and the second inclined guide plate.

5. A sand cleaning device for a 3D printing system as claimed in claim 4, characterized in that: The lower end of the first inclined guide plate is staggered with the lower end of the second inclined guide plate.

6. A sand cleaning device for a 3D printing system according to claim 5, characterized in that: A first support member supporting the first inclined guide plate is fixed on the inner wall of the first long box plate, and a second support member supporting the second inclined guide plate is fixed on the inner wall of the second long box plate.

7. A sand cleaning device for a 3D printing system according to claim 2, characterized in that: The sand collecting and buffering bin comprises a sand collecting hopper and a sand suction duct located below the sand collecting hopper. Both sides of the sand collecting hopper are fixedly connected to the first long box plate and the second long box plate respectively. The lower end of the sand collecting hopper is communicated with the sand suction duct through a sand inlet gap. One end of the sand suction duct is closed, and the other end is connected to a sand suction system.

8. A sand cleaning device for a 3D printing system according to claim 7, characterized in that: A plurality of partitions are arranged in the sand collecting hopper, and the plurality of partitions divide the sand collecting hopper into a plurality of sub-sand hoppers.

9. A sand cleaning device for a 3D printing system according to claim 8, characterized in that: An adjusting plate is installed on the inner side wall of the lower end of the sand dividing hopper, and the adjusting plate is used to adjust the size of the sand feeding gap.

10. A sand cleaning device for a 3D printing system according to claim 9, characterized in that: The adjusting plate is provided with an adjusting long hole, the inner side wall of the lower end of the sand dividing bucket is provided with a bolt mounting hole, and the adjusting bolt passes through the adjusting long hole and the bolt mounting hole and is fixed in cooperation with a nut.

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