Waste sand recovery device of sand mold 3D printer and recovery method of waste sand recovery device

Abstract

The invention discloses a waste sand recovery device of a sand mold 3D printer and a recovery method of the waste sand recovery device, and relates to the technical field of sand mold 3D printing. The waste sand screening device comprises a mounting frame, a stirring feeding assembly and a screening assembly, a lifting stirring rod moves downwards to the position closest to the bottom of the inner wall of a heating stirring box, a lifting sealing plate moves downwards in the moving process of the lifting stirring rod, and a material conveying mechanism transfers waste sand in the heating stirring box into a vibration screening box through a discharging pipe; the vibrating screening box vibrates to screen waste sand blocks in the waste sand and leave the waste sand blocks on the top surface of a screening filter plate, and qualified waste sand enters a recycling box; during cleaning, the lifting stirring rod can vertically move to stir waste sand in the heating stirring box, and after cleaning is completed, the lifting stirring rod downwards moves to the lowest position from the highest position, so that the lifting baffle moves, and the discharging opening is closed; when heating and stirring are carried out, waste sand blocks can be cleaned, so that the heating and stirring work can be carried out without shutdown, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand mold 3D printing technology. Specifically, it particularly relates to a waste sand recycling device and a recycling method for a sand mold 3D printer. Background Art

[0002] A sand mold 3D printer is an additive manufacturing device that directly manufactures sand mold dies by layer-by-layer stacking of materials. Based on a digital three-dimensional model, it selectively sprays a binder (such as resin) to bond sand grains into shape. During the production process of a sand mold 3D printer, a large amount of waste sand that participates in the work but is not used will appear. This waste sand has great recycling value and is usually recycled through a recycling process. When the existing recycling equipment conducts recycling, it usually heats and dehumidifies the waste sand. However, the waste sand accumulates in the recycling box, and the heat is unevenly distributed, resulting in an unsatisfactory dehumidification effect and being unfavorable for subsequent screening work; during the screening process of the waste sand, waste sand blocks will accumulate on the screening filter plate, affecting the screening work. Usually, the machine is stopped for cleaning, reducing the work efficiency. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides the following technical solutions: The present invention is a waste sand recycling device for a sand mold 3D printer, including a mounting frame, a stirring and feeding assembly, and a screening assembly. A collection box is fixedly installed on the mounting frame, and a material conveying mechanism is arranged on one side of the collection box; The stirring and feeding assembly includes a heating and stirring box, a lifting stirring rod, a spiral stirring blade, a discharge pipe, and a lifting closing plate. The heating and stirring box is arranged below the collection box and is fixedly connected to the mounting frame. The lifting stirring rod is arranged inside the heating and stirring box. The spiral stirring blade is fixedly installed on the rod body of the lifting stirring rod. The discharge pipe is fixedly installed at one end of the heating and stirring box. The lifting closing plate is arranged on one side of the discharge pipe; The screening assembly includes a vibrating screening box, a screening filter plate, a recycling box, a cleaning brush, a lifting baffle, and a collection box. The recycling box is arranged above the heating and stirring box and is fixedly connected to the collection box. The vibrating screening box is arranged above the recycling box and is fixedly connected to the mounting frame. The screening filter plate is fixedly installed on the bottom surface of the vibrating screening box. The cleaning brush is arranged inside the vibrating screening box, and the bottom surface of the cleaning brush contacts the top surface of the screening filter plate. A discharge port is opened at one end of the vibrating screening box. The lifting baffle is arranged at the discharge port. The collection box is arranged below the lifting baffle and is fixedly connected to the vibrating screening box; When the recycled waste sand enters the heating and stirring box, the lifting and stirring rod rotates to drive the spiral stirring blade to rotate. When the lifting and stirring rod moves downward to the position closest to the bottom of the inner wall of the heating and stirring box, the downward movement of the lifting and stirring rod can cause the lifting and closing plate to move downward, enabling the material conveying mechanism to transfer the waste sand in the heating and stirring box to the vibration screening box through the discharge pipe. After the vibration screening box works for a period of time, the lifting and stirring rod can move upward and cause the lifting and closing plate to move upward, closing the discharge pipe. During the upward movement of the lifting and stirring rod to the highest position, the lifting baffle can move upward to open the discharge port, and the cleaning brush can move to drive the waste sand blocks on the surface of the screening filter plate to move into the collection box.

[0004] Preferably, the stirring and feeding assembly further includes a feeding hopper, a lifting mounting plate, a fixed stirring rod, a lifting stirring motor, a fixed stirring motor, and a heating plate. The feeding hopper is fixedly installed on the side of the heating and stirring box. An installation chute is formed in the inner wall of one end of the heating and stirring box away from the discharge pipe. The lifting mounting plate is slidably installed in the installation chute. A moving installation groove is formed in the end face of the heating and stirring box, and the moving installation groove communicates with the installation chute. One end of the lifting and stirring rod is rotatably installed on the side of the lifting mounting plate. The lifting stirring motor is fixedly installed on the side of the lifting mounting plate. The driving shaft of the lifting stirring motor passes through the lifting mounting plate and is fixedly connected to the lifting and stirring rod. The fixed stirring rod is rotatably installed on the inner wall of the heating and stirring box. The fixed stirring motor is fixedly installed on the end face of the heating and stirring box. The driving shaft of the fixed stirring motor passes through the heating and stirring box and is fixedly connected to the fixed stirring rod. The spiral stirring blade is fixedly installed on the rod body of the fixed stirring rod. The heating plate is fixedly installed on the inner wall of the heating and stirring box.

[0005] Preferably, the stirring and feeding assembly further includes a closing mounting plate, a closing spring, a gear mounting plate, a rotating gear, a closing rack, and a fixed stop block. The closing mounting plate is fixedly installed at one end of the discharge pipe. A discharge communication slot is formed in the end face of the closing mounting plate. A closing installation groove is formed in the side of the closing mounting plate, and the closing installation groove communicates with the discharge communication slot. The lifting and closing plate is slidably installed in the closing installation groove. One end of the closing spring is fixedly connected to the lifting and closing plate, and the other end is fixedly connected to the bottom surface of the inner wall of the closing installation groove. The closing rack is fixedly installed on the side of the lifting and closing plate. The rotating gear is rotatably installed on the side of the closing mounting plate. The closing rack is slidably installed on the side of the gear mounting plate, and the closing rack meshes with the rotating gear. The fixed stop block is fixedly installed on the side of the closing mounting plate.

[0006] Preferably, the stirring and feeding assembly further includes a lifting connection plate, a lifting electric push rod, a closing connection plate, a cylinder mounting plate, a rack cylinder, and a lifting rack. The lifting connection plate is fixedly installed on the bottom surface of the lifting mounting plate. The lifting electric push rod is fixedly installed in the moving mounting groove. The output end of the lifting electric push rod passes through the moving mounting groove and is fixedly connected to the lifting connection plate. The closing connection plate is fixedly connected to the lifting connection plate. The cylinder mounting plate is fixedly installed on the top surface of the lifting connection plate. The rack cylinder is fixedly installed on one side of the cylinder mounting plate. The output end of the rack cylinder passes through the cylinder mounting plate and is fixedly connected to the lifting rack. The lifting rack can be engaged with the rotating gear.

[0007] Preferably, the screening assembly further includes a support mounting plate, a sliding connection block, a discharge spring, a discharge stop rod, a limiting wedge block, a limiting spring, and a limiting mounting block. The support mounting plate is arranged on both sides of the lifting baffle. The support mounting plate is slidably matched with the lifting baffle. The support mounting plate is fixedly connected to the vibrating screening box. A sliding connection block is slidably installed on the side surface of the support mounting plate. The sliding connection block is fixedly connected to the lifting baffle. The discharge spring is fixedly connected to the sliding connection block on one side. The bottom end of the discharge spring is fixedly connected to the spring mounting plate. The spring mounting plate is fixedly connected to the support mounting plate on one side. The discharge stop rod is fixedly connected to the sliding connection block on the other side. The limiting mounting block is fixedly installed on the end face of the vibrating screening box. The limiting mounting block is provided with a wedge block mounting groove. The limiting wedge block is slidably installed in the wedge block mounting groove. One end of the limiting spring is fixedly connected to the limiting wedge block, and the other end is fixedly connected to the wedge block mounting groove.

[0008] Preferably, the screening assembly further includes a vibration motor, a discharge connection plate, a discharge air cylinder, a discharge moving plate, a cleaning lead screw, a cleaning motor, a cleaning slider, a cleaning lifting plate, and a moving air cylinder. The bottom surface of the discharge connection plate is fixedly connected to the top surface of the lifting connection plate. The discharge air cylinder is fixedly installed on the side surface of the lifting connection plate. The output end of the discharge air cylinder passes through the lifting connection plate and is fixedly connected to the discharge moving plate. The discharge moving plate can contact the discharge stop rod. The vibration motor is fixedly installed with the vibration screening box. Two lead screw mounting plates are fixedly installed on the side surface of the vibration screening box. The two ends of the cleaning lead screw are respectively rotatably connected to the lead screw mounting plates. The cleaning motor is fixedly installed on one side of the lead screw mounting plate. The output end of the cleaning motor passes through the lead screw mounting plate and is fixedly connected to the cleaning lead screw. A cleaning moving notch is formed on the side surface of the vibration screening box. The cleaning slider is threadedly sleeved on the cleaning lead screw. One end of the cleaning slider passes through the cleaning moving notch and is fixedly connected to the cleaning brush. The cleaning lifting plate is arranged at the cleaning moving notch. The moving air cylinder is fixedly installed on the side surface of the vibration screening box. The output end of the moving air cylinder is fixedly connected to the cleaning lifting plate.

[0009] Preferably, the bottom of the heating and stirring box is in a hopper shape, and a circular groove is formed on the bottom surface of the inner wall of the heating and stirring box.

[0010] Preferably, the vibration screening box is fixedly connected to the mounting frame through a hydraulic rod and a spring.

[0011] Preferably, one end of the material conveying mechanism is fixedly connected to the discharge communication notch of the closed mounting plate, and the other end is arranged above the vibration screening box body. A discharge pipe is formed on the bottom surface of the collection box. The vibration screening box and the recycling box are inclined.

[0012] A waste sand recycling method for a sand mold 3D printer uses the above-mentioned recycling device and includes the following steps; Pour the recycled waste sand into the heating and stirring box. The heating and stirring box heats the waste sand. The lifting stirring rod rotates to drive the spiral stirring blade to rotate. The lifting stirring rod moves vertically and reciprocally to stir the waste sand in the heating and stirring box. When the heating is completed, the lifting stirring rod moves downward to the position closest to the bottom of the inner wall of the heating and stirring box. During the movement of the lifting stirring rod, the lifting closing plate moves downward. The material conveying mechanism transfers the waste sand in the heating and stirring box to the vibration screening box through the discharge pipe. The vibration screening box vibrates to screen the waste sand blocks in the waste sand and leave them on the top surface of the screening filter plate. The qualified waste sand enters the recycling box, and the waste sand enters the collection box for storage; After screening for a period of time, the waste sand blocks on the top surface of the screening filter plate increase. The lifting and stirring rod moves upward, driving the lifting and closing plate to move upward to close the discharge pipe. During the process of the lifting and stirring rod moving upward to the highest position, the lifting baffle moves upward and the discharge port opens. The cleaning brush moves and drives the waste sand blocks on the surface of the screening filter plate to move into the collection box. When cleaning, the lifting and stirring rod can move vertically to stir the waste sand in the heating and stirring box. After cleaning, the lifting and stirring rod moves to the highest position and then moves downward from the highest position to the lowest position, driving the lifting baffle to move downward to close the discharge port and opening the discharge pipe, and repeating the cycle.

[0013] Compared with the prior art, the present invention provides a waste sand recycling device and a recycling method for a sand mold 3D printer, having the following beneficial effects: 1. After heating is completed, the lifting and stirring rod moves downward to the position closest to the bottom inner wall of the heating and stirring box. During the movement of the lifting and stirring rod, the lifting and closing plate moves downward. The material transporting mechanism transfers the waste sand in the heating and stirring box to the vibration screening box through the discharge pipe. The vibration screening box vibrates to screen the waste sand blocks in the waste sand and leave them on the top surface of the screening filter plate. The qualified waste sand enters the recycling box, and the waste sand enters the collection box for storage. When cleaning, the lifting and stirring rod can move vertically to stir the waste sand in the heating and stirring box. After cleaning, the lifting and stirring rod moves to the highest position and then moves downward from the highest position to the lowest position, driving the lifting baffle to move downward to close the discharge port, and the equipment operates in a repeating cycle. When heating and stirring, the waste sand block cleaning work can be carried out, enabling the heating and stirring work to continue without stopping, improving work efficiency.

[0014] 2. Pour the recycled waste sand into the heating and stirring box. The heating and stirring box heats the waste sand. The lifting and stirring rod rotates to drive the spiral stirring blade to rotate, and the lifting and stirring rod moves vertically back and forth to stir the waste sand in the heating and stirring box. When heating the waste sand, stirring the waste sand makes the waste sand heat evenly, enabling the moisture in the waste sand to evaporate more fully, making the waste sand more conducive to recycling and screening. When discharging, the waste sand flows into the circular groove, and the lifting and stirring rod drives the spiral stirring blade to move the waste sand to the discharge pipe, facilitating discharging.

[0015] 3. When the waste sand blocks on the top surface of the screening filter plate increase, the lifting and stirring rod moves upward, driving the lifting and closing plate to move upward to close the discharge pipe. During the process of the lifting and stirring rod moving upward to the highest position, the lifting baffle moves upward and the discharge port opens. The cleaning brush moves and drives the waste sand blocks on the surface of the screening filter plate to move into the collection box. Cleaning the waste sand blocks on the screening filter plate prevents excessive accumulation of waste sand blocks, affecting the screening work and reducing the screening effect.

[0016] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. Brief Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention Figure 1 ; Figure 2 Schematic diagram of the partial three-dimensional structure of the present invention Figure 1 ; Figure 3 For Figure 2 Schematic diagram of the structure at position A of ; Figure 4 Schematic diagram of the partial three-dimensional structure of the present invention Figure 2 ; Figure 5 For Figure 4 Schematic diagram of the structure at position B of ; Figure 6 For Figure 4 Schematic diagram of the structure at position C of ; Figure 7 Schematic diagram of the partial three-dimensional structure of the present invention Figure 3 ; Figure 8 For Figure 7 Schematic diagram of the structure at position D of ; Figure 9 Schematic diagram of the partial three-dimensional structure of the present invention Figure 4 ; Figure 10 For Figure 9 Schematic diagram of the structure at position E of ; Figure 11 Schematic diagram of the partial three-dimensional structure of the present invention Figure 5 ; Figure 12 For Figure 11 Schematic diagram of the structure at position F of ; Figure 13 Schematic diagram of the partial three-dimensional structure of the present invention Figure 6 .

[0019] In the drawings, the list of components represented by each reference numeral is as follows: 1. Mounting frame; 101. Collection box; 102. Material conveying mechanism; 2. Stirring and feeding assembly; 201. Heating and stirring box; 202. Lifting stirring rod; 203. Spiral stirring blade; 204. Discharge pipe; 205. Lifting closing plate; 206. Feed hopper; 207. Lifting mounting plate; 208. Fixed stirring rod; 209. Lifting stirring motor; 210. Fixed stirring motor; 211. Heating plate; 212. Closing mounting plate; 213. Closing spring; 214. Gear mounting plate; 215. Rotating gear; 216. Closing rack; 217. Fixed stop block; 218. Lifting connecting plate; 219. Lifting electric push rod; 220. Closing connecting plate; 221. Cylinder mounting plate; 222. Rack cylinder; 223. Lifting rack; 3. Screening assembly; 301. Vibration screening box; 302. Screening filter plate; 303. Recycling box; 304. Cleaning brush; 305. Lifting baffle; 306. Collection box; 307. Support mounting plate; 308. Sliding connection block; 309. Discharge spring; 310. Discharge stop rod; 311. Limiting wedge block; 312. Limiting spring; 313. Limiting mounting block; 314. Vibration motor; 315. Discharge connecting plate; 316. Discharge cylinder; 317. Discharge moving plate; 318. Cleaning lead screw; 319. Cleaning motor; 320. Cleaning slider; 321. Cleaning lifting plate; 322. Moving cylinder. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the invention.

[0021] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] Embodiment, please refer to Figure 1 - Figure 13 , this embodiment discloses a waste sand recycling device for a sand mold 3D printer, including a mounting frame 1, a stirring and feeding assembly 2, and a screening assembly 3. A collection box 101 is fixedly installed on the mounting frame 1, and a material conveying mechanism 102 is arranged on one side of the collection box 101; The stirring and feeding assembly 2 includes a heating and stirring tank 201, a lifting stirring rod 202, a spiral stirring blade 203, a discharge pipe 204, and a lifting closing plate 205. The heating and stirring tank 201 is arranged below the collection tank 101 and is fixedly connected to the mounting frame 1. The lifting stirring rod 202 is arranged inside the heating and stirring tank 201. The spiral stirring blade 203 is fixedly installed on the rod body of the lifting stirring rod 202. The discharge pipe 204 is fixedly installed at one end of the heating and stirring tank 201. The lifting closing plate 205 is arranged on one side of the discharge pipe 204; The screening assembly 3 includes a vibrating screening box 301, a screening filter plate 302, a recycling box 303, a cleaning brush 304, a lifting baffle 305, and a collection box 306. The recycling box 303 is arranged above the heating and stirring tank 201 and is fixedly connected to the collection tank 101. The vibrating screening box 301 is arranged above the recycling box 303 and is fixedly connected to the mounting frame 1. The screening filter plate 302 is fixedly installed on the bottom surface of the vibrating screening box 301. The cleaning brush 304 is arranged inside the vibrating screening box 301, and the bottom surface of the cleaning brush 304 contacts the top surface of the screening filter plate 302. A discharge port is formed at one end of the vibrating screening box 301. The lifting baffle 305 is arranged at the discharge port. The collection box 306 is arranged below the lifting baffle 305 and is fixedly connected to the vibrating screening box 301; When the recycled waste sand enters the heating and stirring tank 201, the lifting stirring rod 202 rotates to drive the spiral stirring blade 203 to rotate. When the lifting stirring rod 202 moves downward to the position closest to the bottom of the inner wall of the heating and stirring tank 201, the downward movement of the lifting stirring rod 202 can cause the lifting closing plate 205 to move downward, enabling the material conveying mechanism 102 to transfer the waste sand in the heating and stirring tank 201 to the vibrating screening box 301 through the discharge pipe 204. After the vibrating screening box 301 works for a period of time, the lifting stirring rod 202 can move upward and cause the lifting closing plate 205 to move upward, closing the discharge pipe 204. During the upward movement of the lifting stirring rod 202 to the highest position, the lifting baffle 305 can be moved upward to open the discharge port, and the cleaning brush 304 can move to drive the waste sand blocks on the surface of the screening filter plate 302 to move into the collection box 306; In use, the recycled waste sand is poured into the heating and stirring tank 201. The heating and stirring tank 201 heats the waste sand. The lifting stirring rod 202 rotates to drive the spiral stirring blade 203 to rotate, and the lifting stirring rod 202 moves vertically and reciprocally to stir the waste sand in the heating and stirring tank 201. When heating the waste sand, stirring the waste sand makes the waste sand evenly heated, enables the moisture in the waste sand to evaporate more fully, and makes the waste sand more conducive to recycling and screening. When the heating is completed, the lifting stirring rod 202 moves downward to the position closest to the bottom of the inner wall of the heating and stirring tank 201. During the movement of the lifting stirring rod 202, the lifting closing plate 205 moves downward. The material transporting mechanism 102 transports the waste sand in the heating and stirring tank 201 to the vibrating screening tank 301 through the discharge pipe 204. The vibrating screening tank 301 vibrates to screen the waste sand blocks in the waste sand and leave them on the top surface of the screening filter plate 302. The qualified waste sand enters the recycling tank 303, and the waste sand enters the collection tank 101 for storage. After screening for a period of time, the waste sand blocks on the top surface of the screening filter plate 302 increase. The lifting stirring rod 202 moves upward. The lifting stirring rod 202 drives the lifting closing plate 205 to move upward to close the discharge pipe 204. During the process of the lifting stirring rod 202 moving upward to the highest position, the lifting baffle 305 moves upward and the discharge port opens. The cleaning brush 304 moves and drives the waste sand blocks on the surface of the screening filter plate 302 to move into the collection box 306. The waste sand blocks on the screening filter plate 302 are cleaned to prevent excessive accumulation of waste sand blocks, which affects the screening work and reduces the screening effect. When cleaning, the lifting stirring rod 202 can move vertically to stir the waste sand in the heating and stirring tank 201. After the cleaning is completed, the lifting stirring rod 202 moves to the highest position and then moves downward from the highest position to the lowest position, driving the lifting baffle 305 to move downward to close the discharge port and open the discharge pipe 204, and the cycle repeats. When heating and stirring, the waste sand block cleaning work can be carried out, enabling the heating and stirring work to continue without stopping and improving work efficiency.

[0023] Please refer to Figure 1 - Figure 13, the stirring and feeding assembly 2 further includes a feeding hopper 206, a lifting mounting plate 207, a fixed stirring rod 208, a lifting stirring motor 209, a fixed stirring motor 210, and a heating plate 211. The feeding hopper 206 is fixedly installed on the side of the heating and stirring tank 201. An installation chute is provided on the inner wall of one end of the heating and stirring tank 201 away from the discharge pipe 204. The lifting mounting plate 207 is slidably installed in the installation chute. A moving installation groove is provided on the end face of the heating and stirring tank 201, and the moving installation groove communicates with the installation chute. One end of the lifting stirring rod 202 is rotatably installed on the side of the lifting mounting plate 207. The lifting stirring motor 209 is fixedly installed on the side of the lifting mounting plate 207. The drive shaft of the lifting stirring motor 209 passes through the lifting mounting plate 207 and is fixedly connected to the lifting stirring rod 202. The fixed stirring rod 208 is rotatably installed on the inner wall of the heating and stirring tank 201. The fixed stirring motor 210 is fixedly installed on the end face of the heating and stirring tank 201. The drive shaft of the fixed stirring motor 210 passes through the heating and stirring tank 201 and is fixedly connected to the fixed stirring rod 208. A spiral stirring blade 203 is fixedly installed on the rod body of the fixed stirring rod 208. The heating plate 211 is fixedly installed on the inner wall of the heating and stirring tank 201; During use, the waste sand enters the heating and stirring tank 201 through the feeding hopper 206, and the heating plate 211 performs the heating work; the lifting stirring motor 209 drives the lifting stirring rod 202 to rotate, the fixed stirring motor 210 drives the fixed stirring rod 208 to rotate, and the rotation of the lifting stirring rod 202 and the fixed stirring rod 208 drives the spiral stirring blade 203 to rotate to stir the waste sand.

[0024] Please refer to Figure 1 - Figure 13 , the stirring and feeding assembly 2 further includes a closing mounting plate 212, a closing spring 213, a gear mounting plate 214, a rotating gear 215, a closing rack 216, and a fixed stop block 217. The closing mounting plate 212 is fixedly installed at one end of the discharge pipe 204. A discharge communication notch is provided on the end face of the closing mounting plate 212. A closing installation groove is provided on the side of the closing mounting plate 212, and the closing installation groove communicates with the discharge communication notch. The lifting closing plate 205 is slidably installed in the closing installation groove. One end of the closing spring 213 is fixedly connected to the lifting closing plate 205, and the other end is fixedly connected to the bottom surface of the inner wall of the closing installation groove. A closing mounting plate 212 is fixedly installed on the side of the lifting closing plate 205. The rotating gear 215 is rotatably installed on the side of the closing mounting plate 212. The closing rack 216 is slidably installed on the side of the gear mounting plate 214. The closing rack 216 meshes with the rotating gear 215. The fixed stop block 217 is fixedly installed on the side of the closing mounting plate 212; During use, when the lifting and stirring rod 202 is at the lowest position, i.e., closest to the bottom surface of the heating and stirring tank 201, the closing rack 216 contacts the fixed stop 217, and the closing spring 213 is in a compressed state. When the lifting and stirring rod 202 moves upward from the lowest position, the rotating gear 215 rotates to drive the closing rack 216 to move. The movement of the closing rack 216 releases its contact with the fixed stop 217, and the closing spring 213 resets, driving the lifting and closing plate 205 to move upward to close the discharge pipe 204.

[0025] Please refer to Figure 1 - Figure 13 The stirring and feeding assembly 2 further includes a lifting connection plate 218, a lifting electric push rod 219, a closing connection plate 220, a cylinder mounting plate 221, a rack cylinder 222, and a lifting rack 223. The lifting connection plate 218 is fixedly installed on the bottom surface of the lifting mounting plate 207. The lifting electric push rod 219 is fixedly installed in the moving mounting groove. The output end of the lifting electric push rod 219 passes through the moving mounting groove and is fixedly connected to the lifting connection plate 218. The closing connection plate 220 is fixedly connected to the lifting connection plate 218. The cylinder mounting plate 221 is fixedly installed on the top surface of the lifting connection plate 218. The rack cylinder 222 is fixedly installed on one side of the cylinder mounting plate 221. The output end of the rack cylinder 222 passes through the cylinder mounting plate 221 and is fixedly connected to the lifting rack 223. The lifting rack 223 can mesh with the rotating gear 215. During use, the lifting electric push rod 219 drives the lifting connection plate 218 to move vertically, and the lifting connection plate 218 drives the lifting mounting plate 207 and the closing connection plate 220 to move vertically. When the lifting and stirring rod 202 moves upward from the lowest position, the rack cylinder 222 drives the lifting rack 223 to move. The lifting rack 223 meshes with the rotating gear 215, and the upward movement of the lifting rack 223 drives the rotating gear 215 to rotate. After the closing rack 216 releases its contact with the fixed stop 217, the movement of the lifting rack 223 releases its engagement with the rotating gear 215. After the lifting and closing plate 205 closes the discharge pipe 204, the lifting and stirring rod 202 can move vertically to perform the stirring work. When the discharge pipe 204 needs to be opened, the lifting and stirring rod 202 moves to the highest position. The lifting rack 223 moves to mesh with the rotating gear 215, and the downward movement of the lifting rack 223 drives the rotating gear 215 to rotate. The rotation of the rotating gear 215 causes the side surface of the closing rack 216 to contact and squeeze the side surface of the fixed stop 217, and the rotating gear 215 cannot rotate. Thus, the lifting rack 223 drives the rotating gear 215 to move downward. When the side surface of the closing rack 216 releases its contact with the side surface of the fixed stop 217, the rotating gear 215 rotates. When the closing rack 216 moves, the top surface of the closing rack 216 contacts and squeezes the bottom surface of the fixed stop 217, and the discharge pipe 204 is opened.

[0026] Please refer to Figure 1 - Figure 13, the screening assembly 3 further includes a support mounting plate 307, a sliding connection block 308, a discharge spring 309, a discharge stop rod 310, a limit wedge 311, a limit spring 312 and a limit mounting block 313. The support mounting plate 307 is arranged on both sides of the lifting baffle 305. The support mounting plate 307 is slidably engaged with the lifting baffle 305 and fixedly connected to the vibration screening box 301. A sliding connection block 308 is slidably mounted on the side of the support mounting plate 307. The sliding connection block 308 is fixedly connected to the lifting baffle 305. The discharge spring 309 is fixedly connected to the sliding connection block 308 on one side. The bottom end of the discharge spring 309 is fixedly connected to a spring mounting plate, and the spring mounting plate is fixedly connected to the support mounting plate 307 on one side. The discharge stop rod 310 is fixedly connected to the sliding connection block 308 on the other side. The limit mounting block 313 is fixedly mounted on the end face of the vibration screening box 301. The limit mounting block 313 is provided with a wedge mounting groove. The limit wedge 311 is slidably mounted in the wedge mounting groove. One end of the limit spring 312 is fixedly connected to the limit wedge 311, and the other end is fixedly connected to the wedge mounting groove; During use, when the lifting stirring rod 202 moves upward, it can cause the discharge stop rod 310 to move upward. The upward movement of the discharge stop rod 310 drives the sliding connection block 308 to move upward, thereby driving the lifting baffle 305 to move upward, and the discharge spring 309 is stretched. During the upward movement of the sliding connection block 308, the top surface of the sliding connection block 308 presses the limit wedge 311, causing the limit wedge 311 to move into the wedge mounting groove. When the sliding connection block 308 contacts the limit wedge 311, the limit wedge 311 moves out of the wedge mounting groove, and the top surface of the limit wedge 311 contacts the bottom surface of the sliding connection block 308, and the discharge port opens. The limit wedge 311 limits the sliding connection block 308 in the downward movement direction.

[0027] Please refer to Figure 1 - Figure 13, the screening assembly 3 further includes a vibration motor 314, a discharge connecting plate 315, a discharge cylinder 316, a discharge moving plate 317, a cleaning lead screw 318, a cleaning motor 319, a cleaning slider 320, a cleaning lifting plate 321, and a moving cylinder 322. The bottom surface of the discharge connecting plate 315 is fixedly connected to the top surface of the lifting connecting plate 218. The discharge cylinder 316 is fixedly installed on the side surface of the lifting connecting plate 218. The output end of the discharge cylinder 316 passes through the lifting connecting plate 218 and is fixedly connected to the discharge moving plate 317. The discharge moving plate 317 can contact the discharge stop rod 310. The vibration motor 314 is fixedly installed with the vibration screening box 301. Two lead screw mounting plates are fixedly installed on the side surface of the vibration screening box 301. The two ends of the cleaning lead screw 318 are respectively rotatably connected to the lead screw mounting plates. The cleaning motor 319 is fixedly installed on one side of the lead screw mounting plate. The output end of the cleaning motor 319 passes through the lead screw mounting plate and is fixedly connected to the cleaning lead screw 318. A cleaning moving notch is formed on the side surface of the vibration screening box 301. The cleaning slider 320 is threadedly sleeved on the cleaning lead screw 318. One end of the cleaning slider 320 passes through the cleaning moving notch and is fixedly connected to the cleaning brush 304. The cleaning lifting plate 321 is arranged at the cleaning moving notch. The moving cylinder 322 is fixedly installed on the side surface of the vibration screening box 301. The output end of the moving cylinder 322 is fixedly connected to the cleaning lifting plate 321; During use, the vibration motor 314 drives the vibration screening box 301 to perform vibration screening; when the lifting stirring rod 202 moves upward, the discharge cylinder 316 drives the discharge moving plate 317 to move. During the upward movement of the discharge moving plate 317, it contacts the discharge stop rod 310 and drives the discharge stop rod 310 to move upward. When the discharge port is opened, the discharge moving plate 317 releases the contact with the discharge stop rod 310, enabling the lifting stirring rod 202 to move vertically for stirring during the cleaning and discharging process of the device. When it is necessary to close the discharge port, the lifting stirring rod 202 moves to the highest position, and the discharge moving plate 317 moves, causing the discharge moving plate 317 to squeeze the limit wedge 311 during the movement, enabling the limit wedge 311 to enter the wedge mounting groove, bringing the sliding connection block 308 into contact with the discharge moving plate 317. The discharge spring 309 expands and contracts, and the sliding connection block 308 squeezes the inclined surface of the limit wedge 311. The movement of the sliding connection block 308 drives the lifting baffle 305 to move back to its original position, closing the discharge port; when the discharge port is opened, the moving cylinder 322 drives the cleaning lifting plate 321 to move upward, the cleaning motor 319 drives the cleaning lead screw 318 to rotate, the rotation of the cleaning lead screw 318 drives the cleaning slider 320 to move, the cleaning slider 320 drives the cleaning brush 304 to move, and the movement of the cleaning brush 304 cleans the screening filter plate 302.

[0028] Please refer to Figure 1 - Figure 13 , the bottom of the heating and stirring box 201 is funnel-shaped, and a circular groove is formed on the bottom surface of the inner wall of the heating and stirring box 201; During use, the waste sand flows into the circular groove, and the lifting stirring rod 202 drives the spiral stirring blade 203 to move the waste sand to the discharge pipe 204, facilitating the discharge of the material.

[0029] Please refer to Figure 1 - Figure 13 The vibration screening box 301 is fixedly connected to the mounting frame 1 through hydraulic rods and springs.

[0030] Please refer to Figure 1 - Figure 13 One end of the material conveying mechanism 102 is fixedly connected to the discharge communication notch of the closed mounting plate 212, and the other end is arranged above the body of the vibration screening box 301. A discharge pipe is opened on the bottom surface of the collection box 101, and the vibration screening box 301 and the recycling box 303 are inclined; During use, the inclination of the vibration screening box 301 and the recycling box 303 facilitates recycling and collection.

[0031] This embodiment also discloses a method for recycling waste sand of a sand mold 3D printer, which uses the above-mentioned recycling device and includes the following steps; Pour the recycled waste sand into the heating and stirring box 201. The heating and stirring box 201 heats the waste sand. The lifting stirring rod 202 rotates to drive the spiral stirring blade 203 to rotate, and the lifting stirring rod 202 moves vertically back and forth to stir the waste sand in the heating and stirring box 201; when the heating is completed, the lifting stirring rod 202 moves downward to the position closest to the bottom of the inner wall of the heating and stirring box 201. During the movement of the lifting stirring rod 202, the lifting closing plate 205 moves downward. The material conveying mechanism 102 transfers the waste sand in the heating and stirring box 201 to the vibration screening box 301 through the discharge pipe 204. The vibration screening box 301 vibrates to screen the waste sand blocks in the waste sand and leave them on the top surface of the screening filter plate 302. The qualified waste sand enters the recycling box 303, and the waste sand enters the collection box 101 for storage; After screening for a period of time, the waste sand blocks on the top surface of the screening filter plate 302 increase. The lifting stirring rod 202 moves upward, and the lifting stirring rod 202 drives the lifting closing plate 205 to move upward to close the discharge pipe 204. During the process of the lifting stirring rod 202 moving upward to the highest position, the lifting baffle 305 moves upward and the discharge port opens. The cleaning brush 304 moves and drives the waste sand blocks on the surface of the screening filter plate 302 to move into the collection box 306; when cleaning, the lifting stirring rod 202 can move vertically to stir the waste sand in the heating and stirring box 201. After the cleaning is completed, the lifting stirring rod 202 moves to the highest position and then moves downward from the highest position to the lowest position, driving the lifting baffle 305 to move downward to close the discharge port and open the discharge pipe 204, and this process repeats in a cycle.

[0032] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0033] The preferred embodiments of the invention disclosed above are only used to help explain the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, so that those skilled in the art can well understand and utilize the invention. The invention is only limited by the claims and their full scope and equivalents.

Claims

1. A waste sand recycling device for a sand mold 3D printer, comprising a mounting frame, a stirring and feeding assembly, and a screening assembly, characterized in that, A collection box is fixedly installed on the mounting frame, and a material conveying mechanism is arranged on one side of the collection box; The stirring and feeding assembly includes a heating and stirring box, a lifting stirring rod, a spiral stirring blade, a discharge pipe and a lifting closing plate. The heating and stirring box is arranged below the collection box and fixedly connected to the mounting frame. The lifting stirring rod is arranged inside the heating and stirring box. The spiral stirring blade is fixedly installed on the rod body of the lifting stirring rod. The discharge pipe is fixedly installed at one end of the heating and stirring box. The lifting closing plate is arranged on one side of the discharge pipe; The screening assembly includes a vibrating screening box, a screening filter plate, a recycling box, a cleaning brush, a lifting baffle and a collection box. The recycling box is arranged above the heating and stirring box and fixedly connected to the collection box. The vibrating screening box is arranged above the recycling box and fixedly connected to the mounting frame. The screening filter plate is fixedly installed on the bottom surface of the vibrating screening box. The cleaning brush is arranged inside the vibrating screening box, and the bottom surface of the cleaning brush contacts the top surface of the screening filter plate. A discharge port is opened at one end of the vibrating screening box. The lifting baffle is arranged at the discharge port. The collection box is arranged below the lifting baffle and fixedly connected to the vibrating screening box; When the recycled waste sand enters the heating and stirring box, the lifting stirring rod rotates to drive the spiral stirring blade to rotate. When the lifting stirring rod moves downward to the position closest to the bottom of the inner wall of the heating and stirring box, the downward movement of the lifting stirring rod can cause the lifting closing plate to move downward, so that the material conveying mechanism transfers the waste sand in the heating and stirring box to the vibrating screening box through the discharge pipe; After the vibrating screening box works for a period of time, the lifting stirring rod can move upward and cause the lifting closing plate to move upward, so that the discharge pipe is closed. During the process of the lifting stirring rod moving upward to the highest position, the lifting baffle can move upward to open the discharge port, and the cleaning brush can move to drive the waste sand blocks on the surface of the screening filter plate to move into the collection box.

2. The waste sand recycling device of a sand mold 3D printer according to claim 1, wherein, The stirring and feeding assembly further includes a feed hopper, a lifting mounting plate, a fixed stirring rod, a lifting stirring motor, a fixed stirring motor and a heating plate. The feed hopper is fixedly installed on the side surface of the heating and stirring box. An installation chute is opened on the inner wall of one end of the heating and stirring box away from the discharge pipe. The lifting mounting plate is slidably installed in the installation chute. A moving installation groove is opened on the end surface of the heating and stirring box, and the moving installation groove communicates with the installation chute. One end of the lifting stirring rod is rotatably installed on the side surface of the lifting mounting plate. The lifting stirring motor is fixedly installed on the side surface of the lifting mounting plate. The driving shaft of the lifting stirring motor passes through the lifting mounting plate and is fixedly connected to the lifting stirring rod. The fixed stirring rod is rotatably installed on the inner wall of the heating and stirring box. The fixed stirring motor is fixedly installed on the end surface of the heating and stirring box. The driving shaft of the fixed stirring motor passes through the heating and stirring box and is fixedly connected to the fixed stirring rod. The spiral stirring blade is fixedly installed on the rod body of the fixed stirring rod. The heating plate is fixedly installed on the inner wall of the heating and stirring box.

3. The waste sand recycling device of a sand mold 3D printer according to claim 2, characterized in that, The stirring and feeding assembly further includes a closed mounting plate, a closing spring, a gear mounting plate, a rotating gear, a closing rack, and a fixed stop block. The closed mounting plate is fixedly installed at one end of the discharge pipe. A discharge communication notch is formed in the end face of the closed mounting plate. A closed mounting groove is formed in the side face of the closed mounting plate. The closed mounting groove communicates with the discharge communication notch. The lifting and closing plate is slidably installed in the closed mounting groove. One end of the closing spring is fixedly connected to the lifting and closing plate, and the other end is fixedly connected to the bottom surface of the inner wall of the closed mounting groove. The lifting and closing plate is fixedly installed on the side face of the closed mounting plate. The rotating gear is rotatably installed on the side face of the closed mounting plate. The closing rack is slidably installed on the side face of the gear mounting plate. The closing rack meshes with the rotating gear. The fixed stop block is fixedly installed on the side face of the closed mounting plate.

4. The waste sand recycling device of a sand mold 3D printer according to claim 3, characterized in that, The stirring and feeding assembly further includes a lifting connecting plate, a lifting electric push rod, a closing connecting plate, a cylinder mounting plate, a rack cylinder, and a lifting rack. The lifting connecting plate is fixedly installed on the bottom surface of the lifting mounting plate. The lifting electric push rod is fixedly installed in the moving mounting groove. The output end of the lifting electric push rod passes through the moving mounting groove and is fixedly connected to the lifting connecting plate. The closing connecting plate is fixedly connected to the lifting connecting plate. The cylinder mounting plate is fixedly installed on the top surface of the lifting connecting plate. The rack cylinder is fixedly installed on one side of the cylinder mounting plate. The output end of the rack cylinder passes through the cylinder mounting plate and is fixedly connected to the lifting rack. The lifting rack can mesh with the rotating gear.

5. The waste sand recycling device of a sand mold 3D printer according to claim 4, characterized in that, The screening assembly further includes a support mounting plate, a sliding connection block, a discharge spring, a discharge stop rod, a limiting wedge block, a limiting spring, and a limiting mounting block. The support mounting plate is arranged on both sides of the lifting baffle. The support mounting plate is slidably matched with the lifting baffle. The support mounting plate is fixedly connected to the vibrating screening box. The side face of the support mounting plate is slidably installed with the sliding connection block. The sliding connection block is fixedly connected to the lifting baffle. The discharge spring is fixedly connected to the sliding connection block on one side. The bottom end of the discharge spring is fixedly connected to the spring mounting plate. The spring mounting plate is fixedly connected to the support mounting plate on one side. The discharge stop rod is fixedly connected to the sliding connection block on the other side. The limiting mounting block is fixedly installed on the end face of the vibrating screening box. A wedge block mounting groove is formed in the limiting mounting block. The limiting wedge block is slidably installed in the wedge block mounting groove. One end of the limiting spring is fixedly connected to the limiting wedge block, and the other end is fixedly connected to the wedge block mounting groove.

6. The waste sand recycling device of a sand mold 3D printer according to claim 5, characterized in that, The screening assembly further includes a vibration motor, a discharge connecting plate, a discharge cylinder, a discharge moving plate, a cleaning lead screw, a cleaning motor, a cleaning slider, a cleaning lifting plate, and a moving cylinder. The bottom surface of the discharge connecting plate is fixedly connected to the top surface of the lifting connecting plate. The discharge cylinder is fixedly installed on the side surface of the lifting connecting plate. The output end of the discharge cylinder passes through the lifting connecting plate and is fixedly connected to the discharge moving plate. The discharge moving plate can contact the discharge stop rod. The vibration motor is fixedly installed with the vibration screening box. Two lead screw mounting plates are fixedly installed on the side surface of the vibration screening box. The two ends of the cleaning lead screw are respectively rotatably connected to the lead screw mounting plates. The cleaning motor is fixedly installed on one side of the lead screw mounting plate. The output end of the cleaning motor passes through the lead screw mounting plate and is fixedly connected to the cleaning lead screw. A cleaning moving notch is formed on the side surface of the vibration screening box. The cleaning slider is threadedly sleeved on the cleaning lead screw. One end of the cleaning slider passes through the cleaning moving notch and is fixedly connected to the cleaning brush. The cleaning lifting plate is arranged at the cleaning moving notch. The moving cylinder is fixedly installed on the side surface of the vibration screening box. The output end of the moving cylinder is fixedly connected to the cleaning lifting plate.

7. The waste sand recycling device of a sand mold 3D printer according to claim 6, characterized in that, The bottom of the heating and stirring box is funnel-shaped, and a circular groove is formed on the bottom surface of the inner wall of the heating and stirring box.

8. The waste sand recycling device of a sand mold 3D printer according to claim 7, characterized in that, The vibration screening box is fixedly connected to the mounting frame through a hydraulic rod and a spring.

9. The waste sand recycling device of a sand mold 3D printer according to claim 8, characterized in that, One end of the material conveying mechanism is fixedly connected to the discharge communication notch of the closed mounting plate, and the other end is arranged above the vibration screening box body. A discharge pipe is formed on the bottom surface of the collection box. The vibration screening box and the recycling box are inclined.

10. A method for recycling waste sand of a sand mold 3D printer, characterized in that, Using the recycling device according to any one of claims 1-9, includes the following steps; Pour the recycled waste sand into the heating and stirring box. The heating and stirring box heats the waste sand. The lifting stirring rod rotates to drive the spiral stirring blade to rotate. The lifting stirring rod moves vertically and reciprocally to stir the waste sand in the heating and stirring box. When the heating is completed, the lifting stirring rod moves downward to the position closest to the bottom surface of the inner wall of the heating and stirring box. During the movement of the lifting stirring rod, the lifting closing plate moves downward. The material conveying mechanism transfers the waste sand in the heating and stirring box to the vibration screening box through the discharge pipe. The vibration screening box vibrates to screen the waste sand blocks in the waste sand and leave them on the top surface of the screening filter plate. The qualified waste sand enters the recycling box, and the waste sand enters the collection box for storage. When screening for a period of time, the waste sand blocks on the top surface of the screening filter plate increase. The lifting stirring rod moves upward. The lifting stirring rod drives the lifting closing plate to move upward to close the discharge pipe. During the process of the lifting stirring rod moving upward to the highest position, the lifting baffle moves upward and the discharge port opens. The cleaning brush moves and drives the waste sand blocks on the surface of the screening filter plate to move into the collection box. When cleaning, the lifting stirring rod can move vertically to stir the waste sand in the heating and stirring box. After the cleaning is completed, the lifting stirring rod moves to the highest position and then moves downward from the highest position to the lowest position, driving the lifting baffle to move downward to close the discharge port and open the discharge pipe, and repeating the cycle.

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