Waste sand recovery device and recovery method for sand mold 3D printer

Abstract

The present invention discloses a waste sand recovery device for a sand mold 3D printer and a recovery method thereof, and relates to the technical field of sand mold 3D printing. The present invention comprises a mounting frame, a stirring and feeding assembly, and a screening assembly. The lifting stirring rod moves downward to the position closest to the bottom of the inner wall of a heating and stirring box. During the movement, the lifting stirring rod causes a lifting and closing plate to move downward. The material transporting mechanism transfers the waste sand in the heating and stirring box to a vibrating screening box through a discharge pipe. The vibrating screening box vibrates and screens the waste sand blocks in the waste sand and leaves them on the top surface of the screening filter plate. Qualified waste sand enters the recovery box. When cleaning is performed, the lifting stirring rod can move vertically to stir the waste sand in the heating and stirring box. After cleaning is completed, the lifting stirring rod moves downward from the highest position to the lowest position, causing the lifting baffle to move and the discharge port to close. When heating and stirring are performed, the waste sand blocks can be cleaned, so that the heating and stirring work can be carried out without stopping the machine, thereby improving work efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand mold 3D printing, and in particular relates to a waste sand recovery device and a recovery method for a sand mold 3D printer. Background Art

[0002] A sand 3D printer is an additive manufacturing device that directly manufactures sand molds by stacking materials layer by layer. Based on a digital 3D model, sand grains are bonded into shape by selectively spraying a binder (such as resin).

[0003] During the production process of sand mold 3D printers, a large amount of waste sand that is involved in the work but not used will be generated. These waste sands have great recycling value and are usually recycled after going through the recycling process. When the existing recycling equipment is used for recycling, the waste sand is usually heated and dehumidified. However, the waste sand accumulates in the recycling box, and the heating is uneven, and the dehumidification effect is not ideal, which is not conducive to the 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 shut down for cleaning, which reduces work efficiency. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides the following technical solutions: The present invention is a waste sand recovery device for a sand mold 3D printer, comprising a mounting frame, a stirring and feeding assembly, and a screening assembly. A collection box is fixedly mounted on the mounting frame, and a material transport mechanism is provided on one side of the collection box.

[0005] The stirring and feeding assembly includes a heating stirring box, a lifting stirring rod, a spiral stirring blade, a discharge pipe and a lifting sealing plate. The heating stirring box is arranged below the collecting box and is fixedly connected to the mounting frame. The lifting stirring rod is arranged in the heating stirring box. The spiral stirring blade is fixedly mounted on the rod body of the lifting stirring rod. The discharge pipe is fixedly mounted on one end of the heating stirring box. The lifting sealing plate is arranged on one side of the discharge pipe.

[0006] The screening assembly includes a vibrating screening box, a screening filter plate, a recovery box, a cleaning brush, a lifting baffle and a collecting box, the recovery box is arranged above the heating and stirring box and is fixedly connected to the collecting box, the vibrating screening box is arranged above the recovery box and is fixedly connected to the mounting frame, the screening filter plate is fixedly mounted on the bottom surface of the vibrating screening box, the cleaning brush is arranged in 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 collecting box is arranged below the lifting baffle, and the collecting box is fixedly connected to the vibrating screening box;

[0007] When the recovered waste sand enters the heating and mixing 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 mixing box, the lifting and stirring rod moves downward to enable the lifting and sealing plate to move downward, so that the material transporting mechanism transfers the waste sand in the heating and mixing box to the vibrating screening box through the discharge pipe; after the vibrating screening box has worked for a period of time, the lifting and stirring rod can move upward and enable the lifting and sealing plate to move upward to close the discharge pipe. In the process of the lifting and 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 and drive the waste sand blocks on the surface of the screening filter plate to move into the collection box.

[0008] Preferably, the stirring 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 mounted on the side of the heated and stirred box, the inner wall of the heated and stirred box at one end away from the discharge pipe is provided with a mounting slot, the lifting mounting plate is slidably mounted in the mounting slot, the end surface of the heated and stirred box is provided with a movable mounting slot, the movable mounting slot is communicated with the mounting slot, one end of the lifting and stirring rod is rotatably mounted on the side surface of the lifting mounting plate, the lifting and stirring motor is fixedly mounted on the side surface of the lifting mounting plate, the lifting and stirring motor drive shaft passes through the lifting mounting plate and is fixedly connected to the lifting and stirring rod, the fixed stirring rod is rotatably mounted on the inner wall of the heated and stirred box, the fixed stirring motor is fixedly mounted on the end surface of the heated and stirred box, the fixed stirring motor drive shaft passes through the heated and stirred box and is fixedly connected to the fixed stirring rod, the spiral stirring blade is fixedly mounted on the rod body of the fixed stirring rod, and the heating plate is fixedly mounted on the inner wall of the heated and stirred box.

[0009] Preferably, the stirring and feeding assembly also includes a closed mounting plate, a closed spring, a gear mounting plate, a rotating gear, a closed rack and a fixed stopper, the closed mounting plate is fixedly mounted on one end of the discharge pipe, the end face of the closed mounting plate is provided with a discharge connecting notch, the side face of the closed mounting plate is provided with a closed mounting groove, the closed mounting groove is communicated with the discharge connecting notch, the lifting and closing plate is slidably mounted in the closed mounting groove, one end of the closed 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 closed mounting plate is fixedly mounted on the side of the lifting and closing plate, the rotating gear is rotatably mounted on the side of the closed mounting plate, the closed rack is slidably mounted on the side of the gear mounting plate, the closed rack is meshed with the rotating gear, and the fixed stopper is fixedly mounted on the side of the closed mounting plate.

[0010] Preferably, the stirring and feeding assembly also includes a lifting connecting plate, a lifting electric push rod, a closed connecting plate, a cylinder mounting plate, a rack cylinder and a lifting rack. The lifting connecting plate is fixedly mounted on the bottom surface of the lifting mounting plate, the lifting electric push rod is fixedly mounted in the movable mounting groove, the output end of the lifting electric push rod is fixedly connected to the lifting connecting plate through the movable mounting groove, the closed connecting plate is fixedly connected to the lifting connecting plate, the cylinder mounting plate is fixedly mounted on the top surface of the lifting connecting plate, the rack cylinder is fixedly mounted on one side of the cylinder mounting plate, the output end of the rack cylinder is fixedly connected to the lifting rack through the cylinder mounting plate, and the lifting rack can engage with the rotating gear.

[0011] The top end of the support leg is fixedly provided with a toothed connecting strip which is cooperatively connected with the toothed connecting strip of the support leg, and the bottom end of the support leg is connected with the toothed connecting strip of the support leg.

[0012] Preferably, the screening assembly further includes a vibration motor, a discharging connecting plate, a discharging cylinder, a discharging movable plate, a cleaning screw rod, a cleaning motor, a cleaning slider, a cleaning lifting plate and a moving cylinder. The bottom surface of the discharging connecting plate is fixedly connected to the top surface of the lifting connecting plate, the discharging cylinder is fixedly mounted on the side of the lifting connecting plate, the output end of the discharging cylinder passes through the lifting connecting plate and is fixedly connected to the discharging movable plate, the discharging movable plate can contact the discharging stop rod, the vibration motor is fixedly mounted on the vibration screening box, two screw mounting plates are fixedly mounted on the side of the vibration screening box, the cleaning The two ends of the screw rod are respectively rotatably connected to the screw rod mounting plate, the cleaning motor is fixedly mounted on one side of the screw rod mounting plate, the output end of the cleaning motor passes through the screw rod mounting plate and is fixedly connected to the cleaning screw rod, a cleaning moving slot is provided on the side of the vibration screening box, the cleaning slider is threadedly sleeved on the cleaning screw rod, one end of the cleaning slider passes through the cleaning moving slot and is fixedly connected to the cleaning brush, the cleaning lifting plate is arranged at the cleaning moving slot, the mobile cylinder is fixedly mounted on the side of the vibration screening box, and the output end of the mobile cylinder is fixedly connected to the cleaning lifting plate.

[0013] Preferably, the bottom of the heating and stirring box is bucket-shaped, and a circular groove is provided on the bottom surface of the inner wall of the heating and stirring box.

[0014] Preferably, the vibration screening box is fixedly connected to the mounting frame via a hydraulic rod and a spring.

[0015] Preferably, one end of the material transport mechanism is fixedly connected to the discharge connecting slot of the closed mounting plate, and the other end is arranged above the vibration screening box. A discharge pipe is provided on the bottom surface of the collection box, and the vibration screening box and the recovery box are inclined.

[0016] A method for recycling waste sand from a sand mold 3D printer, using the above-mentioned recycling device, comprises the following steps:

[0017] The recovered waste sand is poured into the heating and mixing box, which heats the waste sand. The rotation of the lifting and stirring rod drives the spiral stirring blade to rotate, and the lifting and stirring rod moves back and forth vertically to stir the waste sand in the heating and mixing box. When the heating is completed, the lifting and stirring rod moves downward to the bottom of the inner wall of the heating and mixing box, and the lifting and stirring rod causes the lifting and closing plate to move downward during the movement. The material transport mechanism transfers the waste sand in the heating and mixing box to the vibrating screening box through the discharge pipe. The vibrating screening box vibrates to screen out 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 recovery box, and the waste sand enters the collection box for storage.

[0018] 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, and the lifting and stirring rod drives the lifting closing plate to move upward to close the discharge pipe. In the process of the lifting and stirring rod moving upward to the highest position, the lifting baffle moves upward, the discharge port opens, and 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 is completed, the lifting and stirring rod moves to the highest position, and moves downward from the highest position to the lowest position, driving the lifting baffle to move downward, closing the discharge port, and opening the discharge pipe, and repeating the cycle.

[0019] Compared with the prior art, the present invention provides a waste sand recovery device and a waste sand recovery method for a sand mold 3D printer, which has the following beneficial effects:

[0020] 1. 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 mixing box. During the movement, the lifting stirring rod causes the lifting closing plate to move downward, and the material transporting mechanism transfers the waste sand in the heating and mixing box to the vibrating screening box through the discharge pipe. The vibrating 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 recovery box, and the waste sand enters the collection box for storage. When cleaning is performed, the lifting stirring rod can move vertically to stir the waste sand in the heating and mixing box. After cleaning is completed, the lifting stirring rod moves to the highest position and moves downward from the highest position to the lowest position, driving the lifting baffle to move downward, closing the discharge port, and the equipment operates in a reciprocating cycle. When heating and stirring are in progress, the waste sand blocks can be cleaned, so that the heating and stirring work can be carried out without stopping the machine, thereby improving work efficiency.

[0021] 2. Pour the recovered waste sand into the heating and mixing box, heat the waste sand, and the lifting and lowering stirring rod rotates to drive the spiral stirring blade to rotate. The lifting and lowering stirring rod moves vertically back and forth to stir the waste sand in the heating and mixing box; stir the waste sand when heating it to make the waste sand evenly heated, which can make the moisture in the waste sand evaporate more fully and make the waste sand more conducive to recycling and screening. When discharging, the waste sand flows into the circular trough, and the lifting and lowering stirring rod drives the spiral stirring blade to move the waste sand to the discharge pipe for easy discharging.

[0022] 3. As the waste sand blocks on the top surface of the screening filter plate increase, the lifting stirring rod moves upward, which drives the lifting closing plate to move upward to close the discharge pipe. When the lifting stirring rod moves upward to the highest position, the lifting baffle moves upward, the discharge port opens, and the cleaning brush moves and drives the waste sand blocks on the surface of the screening filter plate to move into the collection box; clean the waste sand blocks on the screening filter plate to prevent excessive accumulation of waste sand blocks, which affects the screening work and reduces the screening effect.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The overall three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 2 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 1 ;

[0027] Figure 3 For Figure 2 Schematic diagram of the structure at A;

[0028] Figure 4 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 2 ;

[0029] Figure 5 for Figure 4 Schematic diagram of the structure at B;

[0030] Figure 6 for Figure 4 Schematic diagram of the structure at C;

[0031] Figure 7 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 3 ;

[0032] Figure 8 for Figure 7 Schematic diagram of the structure at D;

[0033] Figure 9 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 4 ;

[0034] Figure 10 for Figure 9 Schematic diagram of the structure at E;

[0035] Figure 11 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 5 ;

[0036] Figure 12 for Figure 11 Schematic diagram of the structure at F;

[0037] Figure 13It is a schematic diagram of the local three-dimensional structure of the present invention Figure 6 .

[0038] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0039] 1. Mounting frame; 101. Collection box; 102. Material transport mechanism; 2. Mixing and feeding assembly; 201. Heating and mixing box; 202. Lifting and lowering stirring rod; 203. Spiral stirring blade; 204. Discharge pipe; 205. Lifting and lowering sealing plate; 206. Feed hopper; 207. Lifting and lowering mounting plate; 208. Fixed stirring rod; 209. Lifting and lowering stirring motor; 210. Fixed stirring motor; 211. Heating plate; 212. Sealing mounting plate; 213. Sealing spring; 214. Gear mounting plate; 215. Rotating gear; 216. Sealing rack; 217. Fixed stopper; 218. Lifting and lowering connecting plate; 219. Lifting and lowering electric push rod; 220. Sealing 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, collecting box; 307, supporting mounting plate; 308, sliding connecting block; 309, discharging spring; 310, discharging baffle; 311, limiting wedge; 312, limiting spring; 313, limiting mounting block; 314, vibration motor; 315, discharging connecting plate; 316, discharging cylinder; 317, discharging moving plate; 318, cleaning screw; 319, cleaning motor; 320, cleaning slider; 321, cleaning lifting plate; 322, moving cylinder. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention.

[0042] For examples, see Figure 1 - Figure 13This embodiment discloses a waste sand recovery device for a sand mold 3D printer, comprising a mounting frame 1, a stirring and feeding assembly 2, and a screening assembly 3. A collection box 101 is fixedly mounted on the mounting frame 1, and a material transport mechanism 102 is provided on one side of the collection box 101.

[0043] The stirring and feeding assembly 2 includes a heating and stirring box 201, a lifting stirring rod 202, a spiral stirring blade 203, a discharge pipe 204 and a lifting and closing plate 205. The heating and stirring box 201 is arranged below the collecting box 101 and is fixedly connected to the mounting frame 1. The lifting stirring rod 202 is arranged in the heating and stirring box 201. The spiral stirring blade 203 is fixedly mounted on the rod body of the lifting stirring rod 202. The discharge pipe 204 is fixedly mounted on one end of the heating and stirring box 201. The lifting and closing plate 205 is arranged on one side of the discharge pipe 204.

[0044] 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 collecting box 306. The recycling box 303 is arranged above the heating and stirring box 201 and is fixedly connected to the collecting box 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 mounted on the bottom surface of the vibrating screening box 301. The cleaning brush 304 is arranged in 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 opened at one end of the vibrating screening box 301, and the lifting baffle 305 is arranged at the discharge port. The collecting box 306 is arranged below the lifting baffle 305, and the collecting box 306 is fixedly connected to the vibrating screening box 301.

[0045] When the recycled waste sand enters the heating and mixing box 201, the lifting and stirring rod 202 rotates to drive the spiral stirring blade 203 to rotate. When the lifting and stirring rod 202 moves downward to the bottom of the inner wall of the heating and mixing box 201, the lifting and stirring rod 202 moves downward to enable the lifting and sealing plate 205 to move downward, so that the material transporting mechanism 102 transfers the waste sand in the heating and mixing box 201 to the vibrating screening box 301 through the discharge pipe 204; when the vibrating screening box 301 has been working for a period of time, the lifting and stirring rod 202 can move upward and enable the lifting and sealing plate 205 to move upward, so that the discharge pipe 204 is closed. When the lifting and stirring rod 202 moves upward to the highest position, the lifting baffle 305 can move upward to open the discharge port, and the cleaning brush 304 can move and drive the waste sand blocks on the surface of the screening filter plate 302 to move into the collecting box 306;

[0046] When in use, the recycled waste sand is poured into the heating and stirring box 201, the heating and stirring box 201 heats the waste sand, the lifting and stirring rod 202 rotates to drive the spiral stirring blade 203 to rotate, and the lifting and stirring rod 202 moves back and forth vertically to stir the waste sand in the heating and stirring box 201; the waste sand is stirred when the waste sand is heated, so that the waste sand is heated evenly, which can make the moisture in the waste sand evaporate more fully, making the waste sand more conducive to recycling and screening; when the heating is completed, the lifting and stirring rod 202 moves downward to the bottom of the inner wall of the heating and stirring box 201 closest to the bottom, and the lifting and stirring rod 202 moves downward during the movement, and the material transporting mechanism 102 transfers the waste sand in the heating and stirring box 201 to the vibrating screening box 301 through the discharge pipe 204. The vibrating 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. Qualified waste sand enters the recovery box 303, and the waste sand enters the collection box 101 for storage;

[0047] 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. In the process of the lifting stirring rod 202 moving upward to the highest position, the lifting baffle 305 moves upward, the discharge port opens, and 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 the waste sand blocks from accumulating Too much will affect the screening work and reduce the screening effect; when cleaning, the lifting stirring rod 202 can move vertically to stir the waste sand in the heating and stirring box 201. After cleaning, the lifting stirring rod 202 moves to the highest position, and moves downward from the highest position to the lowest position, driving the lifting baffle 305 to move downward, closing the discharge port and opening the discharge pipe 204, and repeating the cycle; when heating and stirring are carried out, the waste sand blocks can be cleaned, so that the heating and stirring work can be carried out without stopping, thereby improving work efficiency.

[0048] See also Figure 1 - Figure 13The stirring and feeding assembly 2 also includes a feed 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 feed hopper 206 is fixedly mounted on the side of the heating and stirring box 201. The inner wall of the end of the heating and stirring box 201 away from the discharge pipe 204 is provided with a mounting groove. The lifting mounting plate 207 is slidably mounted in the mounting groove. The end surface of the heating and stirring box 201 is provided with a mobile mounting groove, and the mobile mounting groove is connected to the mounting groove. One end of the lifting stirring rod 202 is rotatably mounted on the side of the lifting mounting plate 207. The stirring motor 209 is fixedly mounted on the side of the lifting mounting plate 207, the driving 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 mounted on the inner wall of the heating stirring box 201, the fixed stirring motor 210 is fixedly mounted on the end surface of the heating stirring box 201, the driving shaft of the fixed stirring motor 210 passes through the heating stirring box 201 and is fixedly connected to the fixed stirring rod 208, a spiral stirring blade 203 is fixedly mounted on the rod body of the fixed stirring rod 208, and a heating plate 211 is fixedly mounted on the inner wall of the heating stirring box 201;

[0049] During use, waste sand enters the heating and stirring box 201 through the feed hopper 206, and the heating plate 211 performs heating work; the lifting and stirring motor 209 drives the lifting and stirring rod 202 to rotate, and the fixed stirring motor 210 drives the fixed stirring rod 208 to rotate. The rotation of the lifting and stirring rod 202 and the fixed stirring rod 208 drives the spiral stirring blade 203 to rotate to stir the waste sand.

[0050] See also Figure 1 - Figure 13 , the stirring and feeding assembly 2 also includes a closed mounting plate 212, a closed spring 213, a gear mounting plate 214, a rotating gear 215, a closed rack 216 and a fixed stopper 217. The closed mounting plate 212 is fixedly mounted on one end of the discharge pipe 204. The end face of the closed mounting plate 212 is provided with a discharge communicating notch. The side of the closed mounting plate 212 is provided with a closed mounting groove, which is communicated with the discharge communicating notch. The lifting and closing plate 205 is slidably mounted in the closed mounting groove. One end of the closing spring 213 is fixedly connected to the lifting and closing plate 205, and the other end is fixedly connected to the bottom surface of the inner wall of the closed mounting groove. The side of the lifting and closing plate 205 is fixedly mounted with a closed mounting plate 212. The rotating gear 215 is rotatably mounted on the side of the closed mounting plate 212. The closed rack 216 is slidably mounted on the side of the gear mounting plate 214. The closed rack 216 meshes with the rotating gear 215, and the fixed stopper 217 is fixedly mounted on the side of the closed mounting plate 212.

[0051] During use, when the lifting stirring rod 202 is in the lowest position, that is, closest to the bottom surface of the heating stirring box 201, the closing rack 216 is in contact with the fixed stop 217, and the closing spring 213 is in a compressed state. When the lifting stirring rod 202 moves upward from the lowest position, the rotating gear 215 rotates to drive the closing rack 216 to move, and the closing rack 216 moves to release the contact with the fixed stop 217. The closing spring 213 resets, driving the lifting closing plate 205 to move upward, so that the discharge pipe 204 is closed.

[0052] See also Figure 1 - Figure 13 , the stirring and feeding assembly 2 also includes a lifting connecting plate 218, a lifting electric push rod 219, a closed connecting plate 220, a cylinder mounting plate 221, a rack cylinder 222 and a lifting rack 223. The lifting connecting plate 218 is fixedly mounted on the bottom surface of the lifting mounting plate 207, the lifting electric push rod 219 is fixedly mounted in the movable mounting groove, the output end of the lifting electric push rod 219 passes through the movable mounting groove and is fixedly connected to the lifting connecting plate 218, the closed connecting plate 220 is fixedly connected to the lifting connecting plate 218, the cylinder mounting plate 221 is fixedly mounted on the top surface of the lifting connecting plate 218, the rack cylinder 222 is fixedly mounted 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, and the lifting rack 223 can engage with the rotating gear 215;

[0053] When in use, the lifting electric push rod 219 drives the lifting connecting plate 218 to move vertically, and the lifting connecting plate 218 drives the lifting mounting plate 207 and the closed connecting plate 220 to move vertically; when the lifting stirring rod 202 moves upward from the lowest position, the rack cylinder 222 drives the lifting rack 223 to move, and the lifting rack 223 is engaged with the rotating gear 215, and the lifting rack 223 moves upward to drive the rotating gear 215 to rotate; when the closed rack 216 is released from contact with the fixed stopper 217, the lifting rack 223 moves to release the engagement with the rotating gear 215, so that the lifting closing plate 205 closes the discharge pipe 204, and the lifting stirring rod 202 can move vertically for stirring. When the discharge pipe 204 is to be opened, the lifting stirring rod 202 moves to the highest position, the lifting rack 223 moves to engage with the rotating gear 215, and the lifting rack 223 moves downward to drive the rotating gear 215 to rotate. The rotation of the rotating gear 215 causes the side of the closed rack 216 to contact and squeeze the side of the fixed stop block 217, and the rotating gear 215 cannot rotate, so that the lifting rack 223 drives the rotating gear 215 to move downward. When the side of the closed rack 216 is released from contact with the side of the fixed stop block 217, the rotating gear 215 rotates, and when the closed rack 216 moves, the top surface of the closed rack 216 contacts and squeezes the bottom surface of the fixed stop block 217, and the discharge pipe 204 is opened.

[0054] See also Figure 1 - Figure 13 , the screening component 3 also includes a support mounting plate 307, a sliding connection block 308, a discharging spring 309, a discharging stop rod 310, a limiting wedge block 311, a limiting spring 312 and a limiting mounting block 313. The support mounting plate 307 is arranged on both sides of the lifting baffle 305, and the support mounting plate 307 slides with the lifting baffle 305. The support mounting plate 307 is fixedly connected to the vibration screening box 301. The sliding connection block 308 is slidably installed on the side of the support mounting plate 307. The sliding connection block 308 is fixedly connected to the lifting baffle 305. The discharging spring 309 is fixedly connected to the sliding connection block 308 on one side, the bottom end of the discharging spring 309 is fixedly connected to the spring mounting plate, the spring mounting plate is fixedly connected to the support mounting plate 307 on one side, the discharging stopper 310 is fixedly connected to the sliding connection block 308 on the other side, the limiting mounting block 313 is fixedly installed on the end surface of the vibration screening box 301, the limiting mounting block 313 is provided with a wedge mounting groove, the limiting wedge 311 is slidably installed in the wedge mounting groove, one end of the limiting spring 312 is fixedly connected to the limiting wedge 311, and the other end is fixedly connected to the wedge mounting groove;

[0055] When in use, when the lifting stirring rod 202 moves upward, the discharging stop rod 310 can move upward. The upward movement of the discharging stop rod 310 drives the sliding connection block 308 to move upward, thereby driving the lifting baffle 305 to move upward, the discharging spring 309 is stretched, and during the upward movement of the sliding connection block 308, the top surface of the sliding connection block 308 squeezes the limiting wedge block 311, so that the limiting wedge block 311 moves into the wedge block mounting groove in the machine. When the sliding connection block 308 contacts the limiting wedge block 311, the limiting wedge block 311 moves out of the wedge block mounting groove, the top surface of the limiting wedge block 311 contacts the bottom surface of the sliding connection block 308, the discharge port is opened, and the limiting wedge block 311 limits the sliding connection block 308 in the downward movement direction.

[0056] See also Figure 1 - Figure 13, the screening assembly 3 also includes a vibration motor 314, a discharge connecting plate 315, a discharge cylinder 316, a discharge moving plate 317, a cleaning 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, and the discharge cylinder 316 is fixedly installed on the side 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 blocking rod 310. The vibration motor 314 is fixedly installed on the vibration screening box 301. The side of the vibration screening box 301 Two screw mounting plates are fixedly installed, and both ends of the cleaning screw 318 are rotatably connected to the screw mounting plates respectively. The cleaning motor 319 is fixedly installed on one side of the screw mounting plate. The output end of the cleaning motor 319 passes through the screw mounting plate and is fixedly connected to the cleaning screw 318. A cleaning moving slot is provided on the side of the vibration screening box 301. The cleaning slider 320 is threadedly sleeved on the cleaning screw 318. One end of the cleaning slider 320 passes through the cleaning moving slot and is fixedly connected to the cleaning brush 304. The cleaning lifting plate 321 is arranged at the cleaning moving slot. A moving cylinder 322 is fixedly installed on the side of the vibration screening box 301, and the output end of the moving cylinder 322 is fixedly connected to the cleaning lifting plate 321.

[0057] When in use, the vibration motor 314 drives the vibration screening box 301 to vibrate and screen; when the lifting stirring rod 202 moves upward, the discharge cylinder 316 drives the discharge moving plate 317 to move, and the discharge moving plate 317 contacts the discharge blocking rod 310 during the upward movement and drives the discharge blocking rod 310 to move upward. When the discharge port is opened, the discharge moving plate 317 releases the contact with the discharge blocking rod 310, so that the lifting stirring rod 202 can move vertically for stirring during the cleaning and discharge process of the device. When the discharge port needs to be closed, the lifting stirring rod 202 moves to the highest position, and the discharge moving plate 317 moves, so that the discharge moving plate 317 moves during the movement process. The limiting wedge block 311 is squeezed in the middle, so that the limiting wedge block 311 enters the wedge block installation groove, so that the sliding connecting block 308 contacts the discharge moving plate 317, the discharge spring 309 expands and contracts, the sliding connecting block 308 squeezes the inclined surface of the limiting wedge block 311, and the sliding connecting block 308 moves to drive the lifting baffle 305 to move and reset, and the discharge port is closed; when the discharge port is opened, the moving cylinder 322 drives the cleaning lifting plate 321 to move upward, and the cleaning motor 319 drives the cleaning screw rod 318 to rotate, and the cleaning screw rod 318 rotates to drive the cleaning slider 320 to move, and the cleaning slider 320 drives the cleaning brush 304 to move, and the cleaning brush 304 moves to clean the screening filter plate 302.

[0058] See also Figure 1 - Figure 13 The bottom of the heating and stirring box 201 is bucket-shaped, and a circular groove is provided on the bottom surface of the inner wall of the heating and stirring box 201;

[0059] When in use, 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 for easy discharge.

[0060] See also Figure 1 - Figure 13 The vibration screening box 301 is fixedly connected to the mounting frame 1 through a hydraulic rod and a spring.

[0061] See also Figure 1 - Figure 13 One end of the material transport mechanism 102 is fixedly connected to the discharge communication slot of the closed mounting plate 212, and the other end is arranged above the vibration screening box 301. A discharge pipe is provided on the bottom surface of the collection box 101. The vibration screening box 301 and the recovery box 303 are inclined;

[0062] During use, the vibration screening box 301 and the recovery box 303 are tilted to facilitate recovery and collection.

[0063] This embodiment also discloses a method for recycling waste sand of a sand mold 3D printer, using the above-mentioned recycling device, comprising the following steps:

[0064] The recycled waste sand is poured into the heating and stirring box 201, and the heating and stirring box 201 heats the waste sand. The lifting and stirring rod 202 rotates to drive the spiral stirring blade 203 to rotate, and the lifting and stirring rod 202 moves back and forth vertically to stir the waste sand in the heating and stirring box 201; when the heating is completed, the lifting and stirring rod 202 moves downward to the bottom of the inner wall closest to the heating and stirring box 201. During the movement, the lifting and stirring rod 202 causes the lifting and closing plate 205 to move downward, and the material transporting mechanism 102 transports the waste sand in the heating and stirring box 201 to the vibrating screening box 301 through the discharge pipe 204. The vibrating 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 recovery box 303, and the waste sand enters the collection box 101 for storage;

[0065] After screening for a period of time, the waste sand blocks on the top surface of the screening filter plate 302 increase, the lifting and stirring rod 202 moves upward, and the lifting and stirring rod 202 drives the lifting and closing plate 205 to move upward to close the discharge pipe 204. In the process of the lifting and stirring rod 202 moving upward to the highest position, the lifting baffle 305 moves upward, 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 and stirring rod 202 can move vertically to stir the waste sand in the heating and stirring box 201. After cleaning is completed, the lifting and stirring rod 202 moves to the highest position, and moves downward from the highest position to the lowest position, driving the lifting baffle 305 to move downward, closing the discharge port, and opening the discharge pipe 204, and repeating the cycle.

[0066] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] The preferred embodiments of the invention disclosed above are intended only to help illustrate the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A waste sand recovery 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 mounted on the mounting frame, and a material transport mechanism is provided on one side of the collection box; The stirring and feeding assembly includes a heating stirring box, a lifting stirring rod, a spiral stirring blade, a discharge pipe and a lifting sealing plate. The heating stirring box is arranged below the collecting box and is fixedly connected to the mounting frame. The lifting stirring rod is arranged in the heating stirring box. The spiral stirring blade is fixedly mounted on the rod body of the lifting stirring rod. The discharge pipe is fixedly mounted on one end of the heating stirring box. The lifting sealing plate is arranged on one side of the discharge pipe. The screening assembly includes a vibrating screening box, a screening filter plate, a recovery box, a cleaning brush, a lifting baffle and a collecting box, the recovery box is arranged above the heating and stirring box and is fixedly connected to the collecting box, the vibrating screening box is arranged above the recovery box and is fixedly connected to the mounting frame, the screening filter plate is fixedly mounted on the bottom surface of the vibrating screening box, the cleaning brush is arranged in 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 collecting box is arranged below the lifting baffle, and the collecting box is fixedly connected to the vibrating screening box; When the recovered waste sand enters the heating and stirring box, the rotation of the lifting stirring rod drives 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 transporting 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 has been working for a period of time, the lifting stirring rod can move upward and make the lifting closing plate move upward to close the discharge pipe. In the process of the lifting stirring rod moving upward to the highest position, the lifting baffle can move upward to open the discharge port. The cleaning brush can move and drive the waste sand blocks on the surface of the screening filter plate into the collection box.

2. The waste sand recovery device for a sand mold 3D printer according to claim 1, characterized in that: The stirring feeding assembly also 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 mounted on the side of the heated and stirred box, the inner wall of the heated and stirred box one end away from the discharge pipe is provided with a mounting slot, the lifting mounting plate is slidably mounted in the mounting slot, the end surface of the heated and stirred box is provided with a movable mounting slot, the movable mounting slot is communicated with the mounting slot, one end of the lifting and stirring rod is rotatably mounted on the side surface of the lifting mounting plate, the lifting and stirring motor is fixedly mounted on the side surface of the lifting mounting plate, the lifting and stirring motor drive shaft passes through the lifting mounting plate and is fixedly connected to the lifting and stirring rod, the fixed stirring rod is rotatably mounted on the inner wall of the heated and stirred box, the fixed stirring motor is fixedly mounted on the end surface of the heated and stirred box, the fixed stirring motor drive shaft passes through the heated and stirred box and is fixedly connected to the fixed stirring rod, the spiral stirring blade is fixedly mounted on the rod body of the fixed stirring rod, and the heating plate is fixedly mounted on the inner wall of the heated and stirred box.

3. The waste sand recovery device for a sand mold 3D printer according to claim 2, characterized in that: The stirring and feeding assembly also includes a closed mounting plate, a closed spring, a gear mounting plate, a rotating gear, a closed rack and a fixed stopper, the closed mounting plate is fixedly mounted on one end of the discharge pipe, the end face of the closed mounting plate is provided with a discharge connecting notch, the side face of the closed mounting plate is provided with a closed mounting groove, the closed mounting groove is communicated with the discharge connecting notch, the lifting and closing plate is slidably mounted in the closed mounting groove, one end of the closed 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 closed mounting plate is fixedly mounted on the side of the lifting and closing plate, the rotating gear is rotatably mounted on the side of the closed mounting plate, the closed rack is slidably mounted on the side of the gear mounting plate, the closed rack is meshed with the rotating gear, and the fixed stopper is fixedly mounted on the side of the closed mounting plate.

4. The waste sand recovery device for a sand mold 3D printer according to claim 3, characterized in that: The stirring and feeding assembly also includes a lifting connecting plate, a lifting electric push rod, a closed connecting plate, a cylinder mounting plate, a rack cylinder and a lifting rack. The lifting connecting plate is fixedly mounted on the bottom surface of the lifting mounting plate, the lifting electric push rod is fixedly mounted in the movable mounting groove, the output end of the lifting electric push rod is fixedly connected to the lifting connecting plate through the movable mounting groove, the closed connecting plate is fixedly connected to the lifting connecting plate, the cylinder mounting plate is fixedly mounted on the top surface of the lifting connecting plate, the rack cylinder is fixedly mounted on one side of the cylinder mounting plate, the output end of the rack cylinder is fixedly connected to the lifting rack through the cylinder mounting plate, and the lifting rack can engage with the rotating gear.

5. The waste sand recovery device for a sand mold 3D printer according to claim 4, characterized in that: The cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame.

6. The waste sand recovery device for a sand mold 3D printer according to claim 5, characterized in that: The screening assembly also includes a vibration motor, a discharging connecting plate, a discharging cylinder, a discharging movable plate, a cleaning screw rod, a cleaning motor, a cleaning slider, a cleaning lifting plate and a moving cylinder. The bottom surface of the discharging connecting plate is fixedly connected to the top surface of the lifting connecting plate. The discharging cylinder is fixedly installed on the side of the lifting connecting plate. The output end of the discharging cylinder passes through the lifting connecting plate and is fixedly connected to the discharging movable plate. The discharging movable plate can contact the discharging stop rod. The vibration motor is fixedly installed on the vibration screening box. Two screw mounting plates are fixedly installed on the side of the vibration screening box. The cleaning screw rod The two ends of the rod are respectively rotatably connected to the screw mounting plate, the cleaning motor is fixedly mounted on one side of the screw mounting plate, the output end of the cleaning motor passes through the screw mounting plate and is fixedly connected to the cleaning screw, a cleaning moving slot is provided on the side of the vibration screening box, the cleaning slider is threadedly sleeved on the cleaning screw, one end of the cleaning slider passes through the cleaning moving slot and is fixedly connected to the cleaning brush, the cleaning lifting plate is arranged at the cleaning moving slot, the mobile cylinder is fixedly mounted on the side of the vibration screening box, and the output end of the mobile cylinder is fixedly connected to the cleaning lifting plate.

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

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

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

10. A method for recycling waste sand from a sand 3D printer, characterized in that: Using the recovery device according to any one of claims 1 to 9, comprising the following steps: The recovered waste sand is poured into the heating and mixing box, which heats the waste sand. The rotation of the lifting and stirring rod drives the spiral stirring blade to rotate, and the lifting and stirring rod moves back and forth vertically to stir the waste sand in the heating and mixing box. When the heating is completed, the lifting and stirring rod moves downward to the bottom of the inner wall of the heating and mixing box, and the lifting and stirring rod causes the lifting and closing plate to move downward during the movement. The material transport mechanism transfers the waste sand in the heating and mixing box to the vibrating screening box through the discharge pipe. The vibrating screening box vibrates to screen out 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 recovery 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, and the lifting and stirring rod drives the lifting closing plate to move upward to close the discharge pipe. In the process of the lifting and stirring rod moving upward to the highest position, the lifting baffle moves upward, the discharge port opens, and 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 is completed, the lifting and stirring rod moves to the highest position, and moves downward from the highest position to the lowest position, driving the lifting baffle to move downward, closing the discharge port, and opening the discharge pipe, and repeating the cycle.

Images