A 3D additive material forming device

Abstract

The present application relates to the technical field of casting molding, and discloses a 3D additive material molding device, including a printing molding chamber, a sand box and a conveying track, the sand box includes: a box body, a plurality of mounting holes are opened on the box body; a sand shifting box, each mounting hole is installed with a sand shifting box; the sand shifting box includes: a box body, a part of the sand shifting box in the sand shifting state is located in the inner cavity of the box body, and the other part is located outside the box body; a moving cylinder, one end of which is located in the inner cavity of the box body, and the other end is located in the inner cavity of the box body, and a plurality of sand inlet holes are opened on the outer peripheral surface of the moving cylinder facing upward; a spiral body, which is rotatably arranged in the moving cylinder; a translation mechanism, which is used to move the moving cylinder into the box body; a driving mechanism, which is used to drive the spiral body to rotate; and sand shifting boxes of different heights are arranged in the vertical direction of each side wall of the box body. The present application improves the efficiency of removing unsolidified sand from the sand box, and reduces the possibility of damaging the sand mold during the sand shifting process.

Description

Technical Field

[0001] The present application relates to the technical field of casting modeling, and in particular to a 3D additive material molding device. Background Art

[0002] 3D additive material molding technology is also known as 3D printing technology. 3D additive material molding technology is also widely used in sand casting. Sand casting is a casting method that uses sand as a molding material to produce castings. A 3D additive material molding device can be used to manufacture sand molds. The sand is bonded into the desired shape by spraying adhesive layer by layer through the 3D additive material molding device, and then degreasing and sintering are performed to finally obtain a sand mold with certain mechanical properties. Compared with traditional casting processes, this technology can greatly shorten the product development cycle, reduce costs, and can produce complex geometric shapes.

[0003] As one of the important parts of the 3D additive material molding device, the sand box is generally equipped with multiple sand boxes. When one of the sand boxes is finished printing, another empty sand box will be transported to the printing device to improve the printing efficiency. After printing, the sand box will be cleaned to remove the unsolidified sand. The cleaned sand will be mixed with new sand for reuse.

[0004] However, in the process of implementing relevant technical solutions, it was found that at least the following technical problems exist: Generally, sand cleaning is to place a negative pressure tube for sand suction in the sand box to suck the sand in the sand box. At present, the sand box is generally large, and multiple sand molds will be printed in the sand box at the same time. This method of sucking unsolidified sand has a low suction efficiency. In addition, since the newly formed sand mold has not yet been degreased and sintered, it is relatively fragile. When the suction tube is near the sand mold, the negative pressure generated during the suction process will inevitably damage the sand mold. Summary of the invention

[0005] The present application provides a 3D additive material forming device, which solves the technical problem in the prior art that the unsolidified sand in the sand box is extracted by suction, which is inefficient and may cause damage to the sand mold. The application improves the efficiency of removing the unsolidified sand from the sand box and reduces the possibility of damaging the sand mold during the sand removal process.

[0006] The present application provides a 3D additive material forming device, including a printing and forming chamber, a sand box and a conveying track for conveying the sand box, wherein the sand box includes: a box body, which is horizontally placed and has an opening at the top, and a plurality of mounting holes are provided on the box body; a sand shifting box, and each of the mounting holes is provided with the sand shifting box; the sand shifting box includes: a box body, which is inserted into the mounting holes, a part of the sand shifting box in the sand shifting state is located in the inner cavity of the box body, and the other part is located outside the box body, and a discharge port is provided on a side wall of the box body located outside the box body; a moving sand shifting box, which is inserted into the mounting holes, and a part of the sand shifting box in the sand shifting state is located in the inner cavity of the box body, and the other part is located outside the box body, and a material discharge port is provided on a side wall of the box body located outside the box body; a moving sand shifting box, which is inserted into the mounting holes, and a part of the sand shifting box in the sand shifting state is located in the inner cavity of the box body, and the other part is located outside the box body; a moving sand shifting box, which is inserted into the mounting holes, and a part of the sand shifting box in the sand shifting state is located in the inner cavity of the box body, and a material discharge port is provided on a side wall of the box body ... The movable cylinder is horizontally arranged and inserted into the side wall of the box body, one end of the movable cylinder in the sand moving state is located in the inner cavity of the box body, and the other end is located in the inner cavity of the box body, and a plurality of sand inlet holes are provided on the outer peripheral surface of the movable cylinder facing upward; a spiral body is rotatably arranged in the movable cylinder; a translation mechanism is installed on the box body and used for moving the movable cylinder into the box body; a driving mechanism is installed on the box body and used for driving the spiral body to rotate; wherein, the sand moving boxes of different heights are arranged in the vertical direction of each side wall of the box body.

[0007] Furthermore, the translation mechanism includes: a screw rod, which is rotatably arranged in the box body, and the length direction of the screw rod is consistent with the length direction of the moving cylinder; a light rod, which is fixed in the box body, and the light rod is parallel to the screw rod; a nut seat, which is connected to the screw rod, and a connecting column 1 is connected between the nut seat and the moving cylinder; a moving seat, which is sleeved on the light rod, and a connecting column 2 is connected between the moving seat and the moving cylinder; a driving motor 1, which is installed on the outer wall of the box body, and the driving motor 1 is used to drive the screw rod to rotate.

[0008] Furthermore, the screw rod is located above the polished rod.

[0009] Furthermore, the driving mechanism includes: gear one, which is coaxially connected to the shaft core rod of the spiral body; a gear support plate, one end of which is used to support the rotating shaft of the gear one, and the other end is located on one side of the connecting column one, and a connecting rod is connected between the gear support plate and the connecting column one; gear two, which is rotatably arranged on the end of the gear support plate away from the gear one; gear three, which is rotatably arranged on the gear support plate, and the gear three is located between the gear one and the gear two, and the gear one, the gear two and the gear three are meshed with each other; a worm wheel, which is coaxially connected to the gear two, and a support rod for supporting the rotation of the worm wheel is fixedly connected to the side wall of the moving cylinder, and the support rod is connected to the connecting rod; a worm, which is meshed with the worm wheel; a driving rod, one end of which is rotatably arranged on the moving cylinder, and the other end passes through the box body and is located outside the box body, and the worm is coaxially connected to the driving rod; a driving motor two, which is slidably arranged on the outer wall of the box body through a slide rail and a slider, and the driving motor two is used to drive the driving rod to rotate.

[0010] Furthermore, the inner wall of the box body is provided with a side groove along the edge of the mounting hole, and the edge of the side panel of the box body located in the inner cavity of the box body and parallel to the side wall of the box body with the mounting hole is formed with a sealing edge, and the sealing edge is used to fit in the side groove.

[0011] Furthermore, the box body is fixedly connected to an outer wall outside the box body with a limiting edge, and the limiting edge of the sand shifting box in the sand shifting state is attached to the outer wall of the box body.

[0012] Furthermore, a lock box mechanism is arranged between the limiting edge and the outer wall of the box body; the lock box mechanism includes: a mounting cross plate, horizontally fixed to the outer wall of the box body; a movable column, vertically inserted into the mounting cross plate; a waist-shaped flange, horizontally arranged and fixed to the bottom of the movable column, and the waist-shaped flange is used to move the limiting edge away from the outer wall of the box body; a ratchet, coaxially connected to the movable column; a pawl, hinged to the mounting cross plate and matched with the ratchet; a spring, one end of which is fixed to the outer wall of the box body, and the other end is fixed to the pawl.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0014] Since a sand moving box is adopted, before cleaning the sand, the height of the sand in the sand box can be observed, and the box closest to the uppermost layer of sand along the height direction of the box body is first pushed into the box body, and then as the height of the sand in the box body decreases, the box body in the vertical direction of the box body is pushed into the box body step by step, and the moving cylinder in the box body is moved into the box body by using a translation mechanism, and the unsolidified sand in the sand box can enter the moving cylinder through the sand inlet hole, and the sand entering the moving cylinder will enter the box body under the step-by-step conveyance of the spiral blades, thereby achieving the synchronous cleaning of sand on all sides of the box body, improving the efficiency of removing unsolidified sand from the sand box, and preventing the cleaning tube with negative pressure from directly acting on the printed sand mold, thereby reducing the possibility of damage to the sand mold during the sand cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the 3D additive material forming device in the embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of the overall structure of the sand box in the embodiment of the present application;

[0017] Figure 3 This is a schematic diagram of the structure of the sand moving box on the box body in the embodiment of the present application;

[0018] Figure 4 for Figure 2The enlarged schematic diagram of part A in the middle mainly illustrates the structure of the lock box mechanism;

[0019] Figure 5 for Figure 2 The schematic diagram of the middle part structure mainly shows the internal structure of the box;

[0020] Figure 6 for Figure 5 The enlarged schematic diagram of part B in the figure mainly illustrates the structure of the driving mechanism;

[0021] In the figure: 1, printing molding chamber; 2, sand box; 21, box body; 211, mounting hole; 212, side groove; 22, sand moving box; 221, box body; 2211, sealing edge; 2212, limiting edge; 222, moving cylinder; 2221, sand feeding hole; 223, spiral body; 2231, shaft core rod; 2232, spiral blade; 224, translation mechanism; 2241, screw rod; 2242, polished rod; 2243, nut seat; 22431, connecting column 1; 2244, moving seat; 22441, connecting column 2; 2245, driving motor 1; 225. Driving mechanism; 2251. Gear 1; 2252. Gear support plate; 22521. Connecting rod; 2253. Gear 2; 2254. Gear 3; 2255. Worm gear; 22551. Support rod; 2256. Worm; 2257. Driving rod; 2258. Driving motor 2; 226. Lock box mechanism; 2261. Mounting cross plate; 2262. Moving column; 2263. Waist-shaped flange; 2264. Ratchet; 2265. Ratchet pawl; 2266. Spring; 227. Discharging inclined pipe; 2271. Strip hole; 3. Conveying track. DETAILED DESCRIPTION

[0022] In order to better understand the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Reference Figure 1 A 3D additive material molding device includes a printing molding chamber 1, a sand box 2 and a conveying track 3. Two sand boxes 2 are placed on the conveying track 3, and the conveying track 3 can move the sand boxes 2 into or out of the printing molding chamber 1. After the empty sand box 2 enters the printing molding chamber 1, the printing device in the printing molding chamber 1 will lay sand in the sand box 2 layer by layer, and spray a layer of adhesive for each layer of sand, and finally bond the sand into a desired shape by spraying the adhesive layer by layer.

[0024] Reference Figure 2 and Figure 3As shown, the sand box 2 includes a box body 21 and a plurality of sand shifting boxes 22. The box body 21 is provided with a plurality of mounting holes 211 for placing the sand shifting boxes 22. Sand shifting boxes 22 of different heights are placed in the vertical direction of each side wall of the box body 21, and a plurality of sand shifting boxes 22 can be arranged along the length direction of the side wall of the box body 21.

[0025] Reference Figure 2 , Figure 3 The sand moving box 22 includes a box body 221 , a moving cylinder 222 , a spiral body 223 , a translation mechanism 224 , a driving mechanism 225 and a box locking mechanism 226 . The box body 221 is in the shape of a rectangular parallelepiped and is arranged horizontally. The box body 221 is inserted into the mounting hole 211, and the length direction of the box body 221 located in the mounting hole 211 is consistent with the length direction of the box body 21. In the sand moving state, a part of the sand moving box 22 is located in the inner cavity of the box body 21, and the other part is located outside the box body 21. The inner wall of the box body 21 is provided with a side groove 212 along the edge of the mounting hole 211. The edge of the side plate of the box body 221 located in the inner cavity of the box body 21 is formed with a sealing edge 2211. The sealing edge 2211 is parallel to the side wall of the box body 21 with the mounting hole 211. When the sand moving box 22 finishes moving sand, the box body 221 is pushed out of the box body 21, and finally the sealing edge 2211 on the box body 221 is fitted in the side groove 212 on the inner wall of the box body 21, so that the side wall of the inner cavity of the box body 21 is flat, so as to ensure the flatness of the sand laid in the box body 21. The box body 221 is located on the outer wall outside the box body 21 and is fixedly connected to a limiting edge 2212. The limiting edge 2212 is attached to the outer wall of the box body 21 in the sand moving state. The limiting edge 2212 can limit the box body 221 when it moves into the box body 21, so that the box body 221 finally moves to a preset position.

[0026] Reference Figure 3 and Figure 4The lock box mechanism 226 is located outside the box body 21 and at the top of the box body 221, and between the limiting edge 2212 and the outer wall of the box body 21. The lock box mechanism 226 includes a mounting horizontal plate 2261, a moving column 2262, a waist flange 2263, a ratchet 2264, a pawl 2265 and a spring 2266. The mounting cross plate 2261 is horizontally fixed to the outer wall of the box body 21 and is located above the top of the box body 221; the movable column 2262 is a cylinder, and the movable column 2262 is vertically inserted into the mounting cross plate 2261; the waist-shaped flange 2263 is horizontally arranged, and the waist-shaped flange 2263 is fixed to the bottom of the movable column 2262, and the waist-shaped flange 2263 is used to limit the surrounding edge 2212 away from the outer wall of the box body 21; the ratchet 2264 is coaxially connected to the movable column 2262, and the ratchet 2264 is located above the top of the box body 221; the pawl 2265 is hinged on the mounting cross plate 2261 and matched with the ratchet 2264; one end of the spring 2266 is fixed to the outer wall of the box body 21, and the other end is fixed to the pawl 2265.

[0027] When the box body 221 moves into the box body 21, the moving column 2262 is moved upward so that the waist-shaped flange 2263 is above the limiting edge 2212, so that the limiting edge 2212 can be attached to the outer wall of the box body 21. When the sand is moved, the box body 221 is moved outward so that the spacing between the limiting edge 2212 and the outer wall of the box body 21 is greater than the width of the waist-shaped flange 2263, and then the moving column 2262 is moved downward. Move so that the waist-shaped flange 2263 is located between the limiting edge 2212 and the outer wall of the box body 21, and then rotate the moving column 2262 to use the waist-shaped flange 2263 to gradually separate the limiting edge 2212 from the outer wall of the box body 21, until the sealing edge 2211 of the box body 221 located in the inner cavity of the box body 21 fits in the edge groove 212 of the inner wall of the box body 21, and then engage the pawl 2265 on the ratchet 2264 to lock the box body 221.

[0028] Continue to refer to Figure 3 As shown, a discharge port is provided on a side wall of the box body 221 located outside the box body 21, and a discharge inclined pipe 227 is connected to the discharge port. The discharge inclined pipe 227 is inclined downward. When the sand shifting box 22 is working, a conveying hose with negative pressure can be connected under the discharge inclined pipe 227, so that the moved sand can pass into the agitator of new and old sand.

[0029] Reference Figure 3 , Figure 5As shown, the moving cylinder 222 is cylindrical and open at both ends. The moving cylinder 222 is horizontally arranged and inserted into the side wall of one side of the box body 221. The length direction of the moving cylinder 222 is consistent with the length direction of the box body 221. The moving cylinder 222 is located on one side of the box body 221 close to the sealing edge 2211. One end of the moving cylinder 222 in the sand moving state is located in the inner cavity of the box body 21, and the other end is located in the inner cavity of the box body 221. A plurality of sand inlet holes 2221 are opened on the outer peripheral surface of the moving cylinder 222 facing upward, and the plurality of sand inlet holes 2221 are evenly distributed along the length direction of the moving cylinder 222. The unsolidified sand in the sand box 2 can enter the moving cylinder 222 through the sand inlet holes 2221. The spiral body 223 is rotatably disposed in the moving cylinder 222, and the spiral body 223 includes an axial core rod 2231 and a spiral blade 2232. The axis of the axial core rod 2231 is colinear with the axis of the moving cylinder 222. The axial core rod 2231 is rotatably disposed in the moving cylinder 222, and the spiral blade 2232 is fixedly connected to the axial core rod 2231. The sand entering the moving cylinder 222 will enter the box body 221 under the step-by-step transportation of the spiral blade 2232.

[0030] Reference Figure 3 , Figure 5 as well as Figure 6 As shown, the translation mechanism 224 is installed in the box body 221, and the translation mechanism 224 is used to move the moving cylinder 222 out of the box body 221 or to be stored in the box body 221. The translation mechanism 224 includes a screw rod 2241, a light rod 2242, a nut seat 2243, a moving seat 2244, and a driving motor 2245. The screw rod 2241 is rotatably arranged in the box body 221, and the length direction of the screw rod 2241 is consistent with the length direction of the moving cylinder 222. The screw rod 2241 is located on the side of the moving cylinder 222 away from the sealing edge 2211. The light rod 2242 is fixed in the box body 221, and the light rod 2242 is parallel to the screw rod 2241. The light rod 2242 is located below the screw rod 2241, and there is a distance between the light rod 2242 and the screw rod 2241. The nut seat 2243 is connected to the screw rod 2241, and a connecting column 1 22431 is connected between the nut seat 2243 and the moving cylinder 222, and the connection between the connecting column 1 22431 and the moving cylinder 222 is located on the outer wall of one end of the inner cavity of the box body 221 when the moving cylinder 222 is in the sand moving state. The rotation of the screw rod 2241 can drive the nut seat 2243 to move horizontally, and then drive the moving cylinder 222 to move. The moving seat 2244 is sleeved on the light rod 2242, and a connecting column 22441 is connected between the moving seat 2244 and the moving cylinder 222, and the connecting column 22441 is located below the connecting column 1 22431. The driving motor 1 2245 is installed on the outer wall of the box body 221, and the driving motor 1 2245 drives the screw rod 2241 to rotate through gear transmission.

[0031] When the driving motor 2245 is started, the driving motor 2245 drives the screw rod 2241 to rotate, the screw rod 2241 drives the nut seat 2243 to move, and the nut seat 2243 drives the moving cylinder 222 to move, so that the moving cylinder 222 can be moved out of the box body 221 or put into the box body 221.

[0032] Continue to refer to Figure 3 , Figure 5 as well as Figure 6As shown, the driving mechanism 225 includes a gear 1 2251, a gear support plate 2252, a gear 2 253, a gear 3 2254, a worm wheel 2255, a worm 2256, a driving rod 2257 and a driving motor 2 2258. The gear 1 2251 is coaxially connected to the shaft core rod 2231 of the spiral body 223, and the gear 1 2251 is located on the outer side of the end of the moving cylinder 222. One end of the gear support plate 2252 is used to support the rotating shaft of the gear 1 2251, and the other end is located on one side of the connecting column 1 22431. A connecting rod 22521 is connected between the gear support plate 2252 and the connecting column 1 22431, and the connecting rod 22521 can be used to support the gear support plate 2252. The gear 2 2253 is rotatably arranged at one end of the gear support plate 2252 away from the gear 1 2251, and there is a gap between the gear 2 2253 and the gear 1 2251. Gear three 2254 is rotatably set on the gear support plate 2252, and gear three 2254 is located between gear one 2251 and gear two 2253. Gear one 2251, gear two 2253 and gear three 2254 are meshed with each other. The rotation of gear two 2253 will drive gear three 2254 to rotate, and the rotation of gear three 2254 will drive gear one 2251 to rotate, and the rotation of gear one 2251 will drive the spiral body 223 to rotate. The worm wheel 2255 is coaxially connected with the gear 2253. A support rod 22551 for supporting the rotation of the worm wheel 2255 is fixed on the side wall of the moving cylinder 222. The support rod 22551 is parallel to the gear support plate 2252. The support rod 22551 is connected with the connecting rod 22521. The support rod 22551, the connecting rod 22521, the gear support plate 2252 and the connecting column 1 22431 are connected to each other to form a support body, which can improve the stability of the driving mechanism 225 and the translation mechanism 224. The worm 2256 is meshed with the worm wheel 2255 and is located below the worm wheel 2255. One end of the driving rod 2257 is rotatably arranged on the moving cylinder 222, and the other end passes through the discharging inclined tube 227 and is located outside the box body 221. The discharging inclined tube 227 is provided with a bar hole 2271 for the driving rod 2257 to pass through. When the driving rod 2257 moves laterally with the moving cylinder 222, the driving rod 2257 can move in the bar hole 2271, and the worm 2256 is coaxially connected to the driving rod 2257. The second driving motor 2258 is slidably arranged on the outer wall of the discharging inclined tube 227 through a slide rail and a slider. The second driving motor 2258 can move along the length direction of the screw rod 2241 under the cooperation of the slide rail and the slider, and the second driving motor 2258 is used to drive the driving rod 2257 to rotate.

[0033] The driving motor 2258 drives the driving rod 2257 to rotate, the driving rod 2257 drives the worm 2256 to rotate, the worm 2256 drives the worm wheel 2255 to rotate, the worm wheel 2255 drives the gear 2 2253 to rotate, the rotation of the gear 2 2253 drives the gear 3 2254 to rotate, the rotation of the gear 3 2254 drives the gear 1 2251 to rotate, the rotation of the gear 1 2251 drives the spiral body 223 to rotate, thereby completing the rotation drive of the spiral body 223. In addition, when the translation When the mechanism 224 drives the moving cylinder 222 to move, since the driving rod 2257 is rotatably set on the moving cylinder 222, the movement of the moving cylinder 222 will drive the driving rod 2257 to move, and the support rod 22551 used to install the worm gear 2255 is also connected to the connecting column 22431, and the connecting column 22431 is fixed on the moving cylinder 222, so that the worm gear 2255 also moves synchronously with the moving cylinder 222. Therefore, when the moving cylinder 222 moves, the driving mechanism 225 also moves synchronously.

[0034] This application can explain its functional principle through the following operation methods:

[0035] When the printing of the molding chamber 1 in the sand box 2 is completed, the conveying track 3 moves the sand box 2 out of the molding chamber 1, and then moves the empty sand box 2 into the molding chamber 1 for printing. Then, the sand box 2 moved out of the molding chamber 1 is cleaned to remove the uncured sand from the sand box 2.

[0036] Before cleaning the sand, release the lock on the box body 221 by the lock box mechanism 226, so that the box body 221 can move into the box body 21, and the box body 221 is pushed into the box body 21 to continue moving, so that the limiting edge 2212 is finally attached to the outer wall of the box body 21, and the box body 221 is pushed to the preset position, and then the translation mechanism 224 is started, and the translation mechanism 224 is used to move the moving cylinder 222 in the box body 221 into the box body 21, and the unsolidified sand in the sand box 2 can enter the moving cylinder 222 through the sand inlet hole 2221, and the sand entering the moving cylinder 222 will enter the box body 221 under the step-by-step transportation of the spiral blade 2232, and the spiral blade 2232 is driven to rotate by the driving mechanism 225.

[0037] A conveying hose with negative pressure can be connected below the discharge inclined pipe 227, and the conveying hose is connected to the agitator of new and old sand, so that the sand entering into the box body 221 can flow into the agitator of new and old sand.

[0038] After the sand cleaning is completed, the moving cylinder 222 is first collected into the box body 221 by using the translation mechanism 224, and then the box body 221 is pushed out of the box body 21, and the box locking mechanism 226 is used to lock the box body 221, and finally the sealing edge 2211 on the box body 221 fits in the edge groove 212 on the inner wall of the box body 21, so that the side wall of the inner cavity of the box body 21 is flat, so as to ensure the flatness of the sand laid in the box body 21.

[0039] Before cleaning the sand, you can observe the height of the sand in the sand box 2, first push the box body 221 closest to the top layer of sand along the height direction of the box body 21 into the box body 21, and then as the height of the sand in the box body 21 decreases, push the box body 221 in the vertical direction of the box body 21 into the box body 21 step by step, so that the sand can be gradually cleaned from top to bottom, and the sand in the box body 21 can be prevented from collapsing and causing impact on the printed sand mold, thereby reducing the possibility of damage to the sand mold.

[0040] As a result, the sand can be cleaned synchronously around the box body 21, which improves the efficiency of removing the unsolidified sand from the sand box 2, and does not allow the cleaning pipe with negative pressure to directly act on the printed sand mold, thereby reducing the possibility of damage to the sand mold during the sand cleaning process.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0042] What has been described above is only a preferred specific implementation manner of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A 3D additive material molding device, comprising a printing molding chamber (1), a sand box (2) and a conveying track (3) for conveying the sand box (2), characterized in that: The sand box (2) comprises: A box body (21) is placed horizontally and has an open top, and a plurality of mounting holes (211) are formed on the box body (21); A sand shifting box (22), wherein each of the mounting holes (211) is mounted with the sand shifting box (22); The sand shifting box (22) comprises: A box body (221) is inserted into the mounting hole (211); a portion of the sand shifting box (22) in the sand shifting state is located in the inner cavity of the box body (21), and another portion is located outside the box body (21); a discharge port is provided on a side wall of the box body (221) located outside the box body (21); A moving cylinder (222) is arranged horizontally and inserted into the side wall of the box body (221); one end of the moving cylinder (222) in a sand moving state is located in the inner cavity of the box body (21), and the other end is located in the inner cavity of the box body (221); and a plurality of sand inlet holes (2221) are provided on the outer peripheral surface of the moving cylinder (222) facing upward; A spiral body (223) rotatably disposed in the moving cylinder (222); A translation mechanism (224) is installed on the box body (221) and is used to move the moving cylinder (222) into the box body (221); A driving mechanism (225) is mounted on the box body (221) and is used to drive the spiral body (223) to rotate; Wherein, the sand shifting boxes (22) of different heights are arranged in the vertical direction of each side wall of the box body (21).

2. A 3D additive material forming device according to claim 1, characterized in that: The translation mechanism (224) comprises: A screw rod (2241) is rotatably disposed in the box body (221), and the length direction of the screw rod (2241) is consistent with the length direction of the moving cylinder (222); A polished rod (2242) is fixed in the box body (221), and the polished rod (2242) is parallel to the lead screw (2241); A nut seat (2243) is connected to the screw rod (2241), and a connecting column 1 (22431) is connected between the nut seat (2243) and the moving cylinder (222); A movable seat (2244) is sleeved on the light rod (2242), and a second connecting column (22441) is connected between the movable seat (2244) and the movable cylinder (222); A driving motor 1 (2245) is mounted on the outer wall of the box body (221), and the driving motor 1 (2245) is used to drive the screw rod (2241) to rotate.

3. A 3D additive material forming device as claimed in claim 2, characterized in that: The lead screw (2241) is located above the smooth rod (2242).

4. A 3D additive material forming device as claimed in claim 2, characterized in that: The driving mechanism (225) comprises: Gear 1 (2251) is coaxially connected to the shaft core rod (2231) of the spiral body (223); A gear support plate (2252), one end of which is used to support the rotating shaft of the gear one (2251), and the other end of which is located on one side of the connecting column one (22431); a connecting rod (22521) is connected between the gear support plate (2252) and the connecting column one (22431); Gear 2 (2253), rotatably disposed on an end of the gear support plate (2252) away from gear 1 (2251); Gear three (2254) is rotatably disposed on the gear support plate (2252), the gear three (2254) is located between the gear one (2251) and the gear two (2253), and the gear one (2251), the gear two (2253) and the gear three (2254) are meshed with each other; The worm wheel (2255) is coaxially connected to the second gear (2253); a support rod (22551) for supporting the rotation of the worm wheel (2255) is fixedly connected to the side wall of the moving cylinder (222); the support rod (22551) is connected to the connecting rod (22521); A worm (2256) meshing with the worm wheel (2255); A driving rod (2257), one end of which is rotatably disposed on the moving cylinder (222), and the other end of which passes through the box body (221) and is located outside the box body (221); the worm (2256) is coaxially connected to the driving rod (2257); The second driving motor (2258) is slidably arranged on the outer wall of the box body (221) via a slide rail and a slider, and the second driving motor (2258) is used to drive the driving rod (2257) to rotate.

5. The 3D additive material forming device according to claim 1, characterized in that: The inner wall of the box body (21) is provided with a side groove (212) along the edge of the mounting hole (211); the box body (221) is located in the inner cavity of the box body (21) and is parallel to the side wall of the box body (21) where the mounting hole (211) is provided, and a sealing edge (2211) is formed on the edge of the side plate; the sealing edge (2211) is used to fit in the side groove (212).

6. The 3D additive material forming device according to claim 1, characterized in that: The box body (221) is fixedly connected to a limiting edge (2212) on an outer wall outside the box body (21); the limiting edge (2212) of the sand shifting box (22) is in a sand shifting state and fits on the outer wall of the box body (21).

7. A 3D additive material forming device according to claim 6, characterized in that: A locking box mechanism (226) is provided between the limiting edge (2212) and the outer wall of the box body (21); The locking box mechanism (226) comprises: A horizontal plate (2261) is installed and fixedly connected horizontally to the outer wall of the box body (21); A movable column (2262) is vertically inserted on the mounting horizontal plate (2261); A waist-shaped flange (2263) is horizontally arranged and fixedly connected to the bottom of the movable column (2262), and the waist-shaped flange (2263) is used to keep the limiting edge (2212) away from the outer wall of the box body (21); A ratchet wheel (2264) is coaxially connected to the moving column (2262); A ratchet pawl (2265) is hinged to the mounting horizontal plate (2261) and matches the ratchet wheel (2264); The spring (2266) has one end fixedly connected to the outer wall of the box body (21) and the other end fixedly connected to the pawl (2265).

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