Automatic foundry sand recovery device

Abstract

The invention belongs to the technical field of intelligent casting, and particularly relates to an automatic foundry sand recovery device which comprises a cleaning box, and a cleaning bin and a conveying belt are arranged in the cleaning box; a drying box is fixedly connected to one side wall of the cleaning box, a material turning mechanism and a drying mechanism are arranged in the drying box, the bottom of the drying box is fixedly connected with a screening bin in a communicating mode, and two smashing rollers are further arranged between the drying box and the screening bin and used for smashing large molding sand particles; a demagnetizing mechanism is arranged in the screening bin; through cooperation of the drying mechanism and the material turning mechanism, sand materials are rapidly dried, then two smashing rollers synchronously and reversely rotate, large particles in the sand materials are smashed, then a fourth motor is started, a magnetic separation barrel is driven to rotate through an output shaft of the fourth motor, iron impurities in the sand materials are magnetically attracted through the magnetic separation barrel, and therefore the iron impurities in the sand materials are removed. And the sand is thrown out under the action of centrifugal force and is finally discharged from the bottom of the screening bin, so that the function of removing iron from the sand is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent casting, and in particular relates to an automatic recovery device for foundry sand. Background Art

[0002] In the field of intelligent casting technology, molding sand is usually required. Sand casting refers to shaping sand in a sand box to form a cavity of a fixed shape inside it, and then pouring molten metal into the cavity. After it cools, a workpiece corresponding to the shape of the cavity will be formed; after the workpiece is formed, the sand can be directly destroyed to remove the workpiece, and the sand can be reused repeatedly; however, at this time, a large amount of sand often adheres to the surface of the workpiece, so the sand attached to the workpiece needs to be cleaned and recycled first.

[0003] A Chinese patent with publication number CN117718433B discloses an automatic cleaning and recovery device for precision casting sand, including a longitudinal lifting drive mechanism, a bidirectional flexible lifting and unloading mechanism, a reciprocating baffle mechanism and an ultrasonic sand removal mechanism. The ultrasonic sand removal mechanism includes an external box, a sand removal box and an ultrasonic generator, and the sand removal box is arranged in the external box; through the rotation of the outer shell of the driven gear, the entire drive belt and the flexible T-shaped track attached to the drive belt can be driven to roll and transmit, thereby making the bidirectional flexible lifting and unloading mechanism cyclical, and realizing the lifting and dumping of materials during the cyclic movement; the hopper locking assembly can temporarily lock the trapezoidal hopper assembly in stages. Only when the next set of trapezoidal hopper assemblies is close to the trapezoidal hopper assembly currently used for collecting materials, the current trapezoidal hopper assembly will be released and raised. Therefore, when the trapezoidal hopper assemblies are intermittently arranged, the continuity of material collection can still be achieved, and the sand in the sand removal box is prevented from entering the external box.

[0004] In the above technology, after the iron workpiece is cast, the molding sand will contain a large amount of iron filings impurities. Therefore, the molding sand needs to be magnetically attracted to remove the iron filings impurities in the molding sand. Otherwise, the molding sand recovery effect will be poor. If it is directly used for the next casting, the molding sand is not fine enough, resulting in a grainy and rough surface of the cast workpiece.

[0005] To this end, the present invention provides an automatic recovery device for foundry sand. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the automatic recovery device for casting sand described in the present invention includes a cleaning box, which is provided with a cleaning bin and a conveyor belt; a drying box is fixedly connected to one side wall of the cleaning box, and a turning mechanism and a drying mechanism are provided in the drying box, and the bottom of the drying box is connected to a screening bin, and two crushing rollers are provided between the drying box and the screening bin for crushing large pieces of casting sand particles; a demagnetization mechanism is provided in the screening bin, and the demagnetization mechanism includes a mounting plate fixedly connected to the inner wall of the screening bin, and a fourth motor is fixedly connected to the bottom of the mounting plate, and the output shaft of the fourth motor is rotatably connected to the mounting plate through a bearing, and the output shaft of the fourth motor is fixedly connected to a magnetic separation drum; a control valve is installed at the bottom end of the screening bin.

[0008] Preferably, two pillars are fixed to the bottom of the cleaning box, and a fixed ring plate is fixed to the top of the pillar; side plates are symmetrically fixed to the two side walls of the fixed ring plate, and the conveyor belt is arranged between the two side plates through a roller, and a driving motor is provided on one side of the conveyor belt; a plurality of fixed plates are fixed in a circular arrangement on the surface of the conveyor belt; the conveyor belt is arranged at an angle, and the top end of the conveyor belt passes through the drying box; and a filter screen is installed on the top end of each side plate.

[0009] Preferably, the cleaning bin is fixedly connected to the top inner wall of the cleaning box, and the bottom of the cleaning bin is arranged above the conveyor belt; two cleaning brushes are rotatably connected to the cleaning bin through a roller shaft, and one end of the roller shaft is fixedly connected to a first gear, and the two first gears are engaged with each other; the outer wall of the cleaning bin is fixedly connected to a first motor, and the output shaft of the first motor is fixedly connected to one end of the roller shaft.

[0010] Preferably, the bottom of the cleaning box is fixedly connected to a fixing frame, and a water delivery box is rotatably connected between the two inner side walls of the fixing frame via a bearing; the bottom end of the water delivery box is rotatably connected to a plurality of rotating nozzles; one end of the water delivery box is connected and fixed to a connecting pipe; a second gear is fixed to the outer wall of the connecting pipe; an electric push rod is fixed to the side wall of the fixing frame, and the output end of the electric push rod is fixed to a rack, which meshes with the second gear; the rack is slidably connected to the fixing frame via a limit rod; a delivery pipe is installed at one end of the connecting pipe through an adapter, and one end of the delivery pipe is connected and fixed to the bottom end of the cleaning box, and a water pump is installed on the outer wall of the delivery pipe.

[0011] Preferably, the material turning mechanism includes a reciprocating screw rod rotatably connected to the inner wall of the drying box through a bearing, a movable plate is threadedly connected to the reciprocating screw rod, and rake teeth are fixed to the bottom of the movable plate; two guide rods are fixed to the inner wall of the drying box, and the movable plate is slidably connected to the two guide rods; a second motor is fixed to the outer wall of the drying box, and the output shaft of the second motor is fixed to one end of the reciprocating screw rod.

[0012] Preferably, a mounting seat is fixedly connected to the top of one end of the rake teeth close to the conveyor belt, a cleaning brush is rotatably connected to the mounting seat via a rotating shaft, and a torsion spring is provided between the rotating shaft and the mounting seat.

[0013] Preferably, an inclined plate is fixedly connected to the inner wall of the bottom end of the drying box, and the bottom of the rake teeth is in contact with the surface of the inclined plate; the end of the inclined plate close to the washing box is higher than the end away from the washing box; a discharge port is provided at the bottom end of the inclined plate; a sealing plate is rotatably connected to the inner wall of the drying box, and the sealing plate is provided below the discharge port; a third motor is provided at one end of the sealing plate.

[0014] Preferably, the crushing roller is rotatably connected to the bottom end of the drying box via a connecting shaft; one end of the connecting shaft is fixedly connected to a third gear, and the two third gears are engaged with each other; one end of one of the connecting shafts is fixedly connected to a second rotating wheel; one end of the reciprocating screw is fixedly connected to a first rotating wheel, and a belt is provided between the first rotating wheel and the second rotating wheel.

[0015] Preferably, the drying mechanism includes a heating chamber fixedly connected to the side wall of the drying box away from the washing box, a first fan is installed in the heating chamber, a heating pipe is also provided on the side of the heating chamber close to the drying box, and a humidity sensor is also provided on the rake teeth, and the humidity sensor is electrically connected to the drive motor.

[0016] Preferably, a top frame is fixedly connected to the top of the drying box, and a second fan is provided in the top frame.

[0017] The beneficial effects of the present invention are as follows: 1. The automatic recovery device for foundry sand described in the present invention passes through a magnetic separation drum, and when dry and loose sand falls into a screening bin, the fourth motor is turned on, and the magnetic separation drum is driven to rotate by the output shaft of the fourth motor. The magnetic separation drum magnetically attracts iron impurities in the sand, and the sand is thrown out under the action of centrifugal force and finally discharged from the bottom of the screening bin, thereby realizing the function of removing iron from the sand.

[0018] 2. An automatic recovery device for casting sand described in the present invention, through the cooperation of the reciprocating screw, the first rotating wheel and the second rotating wheel, the second motor is turned on, and the output shaft of the second motor drives the movable plate to move. During the movement of the movable plate, the movable plate slides on the guide rod, and the guide rod limits the movable plate to slide in the horizontal direction, and the movable plate drives the rake teeth to move, and the sand material is pushed to fall quickly from the discharge port through the rake teeth; wherein the reciprocating screw drives the first rotating wheel to rotate through the reciprocating screw, and the first rotating wheel drives the belt to rotate through the belt, and the second rotating wheel drives the connecting shaft to rotate through the second rotating wheel, and the cooperation of the connecting shaft and the third gear is realized to realize the synchronous reverse rotation of the two crushing rollers, thereby crushing large particles in the sand material and improving the demagnetization effect.

[0019] 3. The automatic recovery device for foundry sand described in the present invention cooperates with a first fan, a second fan and a humidity sensor. By energizing the heating tube and the first fan, heat is emitted through the heating tube, and the first fan blows the heat into the drying box. The second fan blows the hot air above the drying box toward the sand material to prevent the hot air from diffusing upward, thereby improving the drying efficiency. The humidity of the sand material is monitored in real time by the humidity sensor. When the humidity sensor reaches a set threshold, the system program controls the shutdown of the drive motor to stop the conveying of the conveyor belt, and then discharges the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a perspective view of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a structural schematic diagram of the fixed ring plate in the present invention; Figure 4 It is a structural schematic diagram of the movable plate in the present invention; Figure 5 is a cross-sectional view of the screening bin in the present invention; Figure 6 It is an enlarged view of point A in the present invention; Figure 7 It is a schematic structural diagram of the crushing roller in the present invention; Figure 8 It is a structural schematic diagram of the first gear in the present invention; Figure 9 It is a structural diagram of the water delivery box of the present invention; In the figure: 1. cleaning box; 11. support; 12. fixed ring plate; 13. side plate; 14. conveyor belt; 15. fixed plate; 16. filter screen; 17. cleaning chamber; 171. cleaning brush; 172. first motor; 173. first gear; 18. fixed frame; 181. water delivery box; 182. rotating nozzle; 183. connecting pipe; 184. delivery pipe; 185. electric push rod; 186. rack; 187. second gear; 188. limit rod; 189. water pump; 2. drying box; 21. movable plate; 211. rake teeth; 212. second Motor; 213, reciprocating screw; 214, guide rod; 215, first rotor; 216, mounting base; 217, cleaning brush; 218, humidity sensor; 22, heating chamber; 221, first fan; 222, heating tube; 23, top frame; 231, second fan; 24, inclined plate; 241, blocking plate; 242, third motor; 25, crushing roller; 251, third gear; 252, second rotor; 253, belt; 26, screening chamber; 261, magnetic separation drum; 262, mounting plate; 263, fourth motor; 264, control valve. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] like Figure 1 、 Figure 2 and Figure 5 As shown, an automatic recovery device for foundry sand described in an embodiment of the present invention includes a cleaning box 1, which is provided with a cleaning bin 17 and a conveyor belt 14; a drying box 2 is fixedly connected to one side wall of the cleaning box 1, and a turning mechanism and a drying mechanism are provided in the drying box 2, and a screening bin 26 is connected to and fixedly connected to the bottom of the drying box 2, and two crushing rollers 25 are further provided between the drying box 2 and the screening bin 26 for crushing large pieces of molding sand particles; a demagnetization mechanism is provided in the screening bin 26, and the demagnetization mechanism includes a mounting plate 262 fixedly connected to the inner wall of the screening bin 26, and a fourth motor 263 is fixedly connected to the bottom of the mounting plate 262, and the output shaft of the fourth motor 263 is rotatably connected to the mounting plate 262 through a bearing, and the output shaft of the fourth motor 263 is fixedly connected to a magnetic separation drum 261; a control valve 264 is installed at the bottom end of the screening bin 26.

[0024] In the field of intelligent casting technology, molding sand is usually required. Molding sand casting refers to shaping the sand in a sand box to form a cavity of fixed shape inside it, and then pouring the molten metal into the cavity. After it cools, a workpiece corresponding to the shape of the cavity will be formed; after the workpiece is formed, the sand can be directly destroyed to remove the workpiece, and the sand can be reused repeatedly; but at this time, a large amount of sand often adheres to the surface of the workpiece, so it is necessary to first clean and recycle the sand attached to the workpiece. After the casting of the iron workpiece is completed, the molding sand will contain a large amount of iron filings impurities. Therefore, the molding sand needs to be magnetically attracted to remove the iron filings impurities in the molding sand, otherwise the molding sand recovery effect will be poor.

[0025] When the demagnetization mechanism provided by the present invention is in use, after the workpiece is formed, the sand on the surface is removed by destroying the sand material, and then the workpiece is placed in the cleaning bin 17 for brushing to remove the sand on the surface. The sand falls on the conveyor belt 14 below under the action of water flow and gravity, and is transported upward to the drying box 2 under the action of the conveyor belt 14. It is dried by the drying mechanism in the drying box 2. During the drying process, the material is turned over by the turning mechanism to improve the drying effect. The dried sand falls on the crushing roller 25 and is crushed, so that the sand falling into the screening bin 26 is finally dry and loose. In the process of the sand falling into the screening bin 26, the fourth motor 263 is turned on, and the output shaft of the fourth motor 263 drives the magnetic separation drum 261 to rotate. The magnetic separation drum 261 magnetically attracts iron impurities in the sand, and the sand is thrown out under the action of centrifugal force, and finally discharged from the bottom of the screening bin 26, thereby realizing the function of removing iron from the sand.

[0026] like Figure 2 and Figure 3 As shown, two pillars 11 are fixed to the bottom of the cleaning box 1, and a fixed ring plate 12 is fixed to the top of the pillar 11; side plates 13 are symmetrically fixed to the two side walls of the fixed ring plate 12, and the conveyor belt 14 is arranged between the two side plates 13 through a roller, and a driving motor is provided on one side of the conveyor belt 14; a plurality of fixed plates 15 are fixed to the surface of the conveyor belt 14 in a circular arrangement; the conveyor belt 14 is arranged at an angle, and the top end of the conveyor belt 14 passes through the drying box 2; and a filter screen 16 is installed on the top end of each side plate 13.

[0027] When the conveyor belt 14 provided by the present invention is in use, the drive motor is turned on to drive the conveyor belt 14 to rotate and transport sand materials. A fixed plate 15 is provided on the conveyor belt 14 to block the sand materials and prevent the sand materials from being washed down from the bottom of the conveyor belt 14 by the water flow. A filter screen 16 is provided to facilitate the water inside the fixed plate 15 to flow out from the filter screen 16. A fixed ring plate 12 is provided, and the fixed ring plate 12 is in contact with the surface of the inner fixed plate 15, so that some of the fallen sand materials can be scraped up and transported through the fixed plate 15.

[0028] like Figure 2 and Figure 8 As shown, the cleaning chamber 17 is fixedly connected to the top inner wall of the cleaning box 1, and the bottom of the cleaning chamber 17 is arranged above the conveyor belt 14; the cleaning chamber 17 is rotatably connected to two cleaning brushes 171 through a roller shaft, and one end of the roller shaft is fixedly connected to a first gear 173, and the two first gears 173 are engaged with each other; the outer wall of the cleaning chamber 17 is fixedly connected to a first motor 172, and the output shaft of the first motor 172 is fixedly connected to one end of the roller shaft.

[0029] When the cleaning brush 171 provided by the present invention is in use, the first motor 172 is turned on, and the output shaft of the first motor 172 drives the roller to rotate, which drives the first gear 173 to rotate, and the first gear 173 drives another gear to rotate, which drives the connected roller to rotate through another gear. The two rollers rotate synchronously in opposite directions to drive the cleaning brush 171 to rotate, and the sand material on the surface of the workpiece is brushed with water spraying.

[0030] like Figure 2 and Figure 9 As shown, the bottom of the cleaning box 1 is fixedly connected to a fixing frame 18, and a water delivery box 181 is rotatably connected between the two inner side walls of the fixing frame 18 through a bearing; the bottom end of the water delivery box 181 is rotatably connected to a plurality of rotating nozzles 182; one end of the water delivery box 181 is connected and fixedly connected to a connecting pipe 183; a second gear 187 is fixedly connected to the outer wall of the connecting pipe 183; an electric push rod 185 is fixedly connected to the side wall of the fixing frame 18, and the output end of the electric push rod 185 is fixedly connected to a rack 186, which meshes with the second gear 187; the rack 186 is slidably connected to the fixing frame 18 through a limit rod 188; one end of the communicating pipe 183 is installed with a delivery pipe 184 through an adapter, and one end of the delivery pipe 184 is connected and fixedly connected to the bottom end of the cleaning box 1, and a water pump 189 is installed on the outer wall of the delivery pipe 184.

[0031] When the rack 186 and the second gear 187 provided by the present invention are in use, when brushing the workpiece, by turning on the electric push rod 185, the rack 186 is driven to move by the output end of the electric push rod 185, and the second gear 187 is driven to rotate by the rack 186, and the connecting pipe 183 is driven to rotate by the second gear 187, and the water delivery box 181 is driven to swing back and forth by the connecting pipe 183, and the rotating nozzle 182 is driven to swing back and forth by the water delivery box 181, thereby expanding the scope of flushing. The flowing water makes it easy to quickly drop the sand material that has fallen off after being brushed, and the sand material is transported upward with the conveyor belt 14. Then the filtered water falls into the cleaning box 1, and is finally pumped into the water delivery box 181 through the delivery pipe 184 by the water pump 189, thereby realizing the recycling of flushing water.

[0032] like Figure 2 and Figure 4 As shown, the material turning mechanism includes a reciprocating screw rod 213 rotatably connected to the inner wall of the drying box 2 through a bearing, a movable plate 21 is threadedly connected to the reciprocating screw rod 213, and the bottom of the movable plate 21 is fixedly connected to the rake teeth 211; two guide rods 214 are fixedly connected to the inner wall of the drying box 2, and the movable plate 21 is slidably connected to the two guide rods 214; a second motor 212 is fixedly connected to the outer wall of the drying box 2, and the output shaft of the second motor 212 is fixedly connected to one end of the reciprocating screw rod 213.

[0033] When the turning mechanism provided by the present invention is in use, during the drying process, the second motor 212 needs to be turned on, and the movable plate 21 is driven to move by the output shaft of the second motor 212. During the movement of the movable plate 21, the movable plate 21 slides on the guide rod 214, and the guide rod 214 limits the movable plate 21 to slide in the horizontal direction. The rake teeth 211 are driven to move by the movable plate 21, and the sand material in the drying box 2 is turned over by the rake teeth 211 to improve the drying efficiency.

[0034] like Figure 4 As shown, a mounting seat 216 is fixedly connected to the top of one end of the rake teeth 211 close to the conveyor belt 14 , and a cleaning brush 217 is rotatably connected to the mounting seat 216 via a rotating shaft, and a torsion spring is provided between the rotating shaft and the mounting seat 216 .

[0035] When the cleaning brush 217 provided by the present invention is in use, the rake teeth 211 drives the mounting seat 216 to reciprocate during the reciprocating motion, and the mounting seat 216 drives the cleaning brush 217 to reciprocate, and the sand material at the bottom of the conveyor belt 14 is swept away by the cleaning brush 217, wherein a torsion spring is provided between the rotating shaft and the mounting seat 216. When the fixed plate 15 passes the cleaning brush 217, the cleaning brush 217 will rotate, but the cleaning brush 217 will quickly move to one side of the conveyor belt 14. Without the pressure of the fixed plate 15, the cleaning brush 217 will quickly reset under the action of the torsion spring and continue cleaning.

[0036] like Figure 2 and Figure 6 As shown, an inclined plate 24 is fixedly connected to the inner wall of the bottom end of the drying box 2, and the bottom of the rake teeth 211 is attached to the surface of the inclined plate 24; the end of the inclined plate 24 close to the cleaning box 1 is higher than the end away from the cleaning box 1; the bottom end of the inclined plate 24 is provided with a discharge port; a sealing plate 241 is rotatably connected to the inner wall of the drying box 2, and the sealing plate 241 is provided below the discharge port; a third motor 242 is provided at one end of the sealing plate 241.

[0037] When the inclined plate 24 and the sealing plate 241 provided by the present invention are in use, the inclined plate 24 is set to facilitate discharging during the turning process. When discharging is required, the third motor 242 is turned on, and the sealing plate 241 is driven to rotate by the third motor 242. The sealing plate 241 rotates to the top of the crushing roller 25. Under the guidance of the sealing plate 241, the sand material slides onto the crushing roller 25.

[0038] like Figure 7 As shown, the crushing roller 25 is rotatably connected to the bottom end of the drying box 2 via a connecting shaft; one end of each connecting shaft is fixedly connected to a third gear 251, and the two third gears 251 are meshed with each other; one end of one of the connecting shafts is fixedly connected to a second rotating wheel 252; one end of the reciprocating screw rod 213 is fixedly connected to a first rotating wheel 215, and a belt 253 is provided between the first rotating wheel 215 and the second rotating wheel 252.

[0039] When the crushing roller 25 provided by the present invention is in use, during the discharging process, the second motor 212 is turned on, and the output shaft of the second motor 212 drives the movable plate 21 to move. During the movement of the movable plate 21, the movable plate 21 slides on the guide rod 214, and the guide rod 214 limits the movable plate 21 to slide in the horizontal direction, and drives the rake teeth 211 to move through the movable plate 21, and pushes the sand material to fall quickly from the discharge port through the rake teeth 211; wherein the reciprocating screw rod 213 drives the first rotating wheel 215 to rotate through the reciprocating screw rod 213, and drives the belt 253 to rotate through the first rotating wheel 215, and drives the second rotating wheel 252 to rotate through the belt 253, and drives the connecting shaft to rotate through the second rotating wheel 252, and the two crushing rollers 25 are synchronized and rotated in opposite directions through the cooperation of the connecting shaft and the third gear 251, so that the large particles in the sand material are crushed and the demagnetization effect is improved.

[0040] like Figure 2 As shown, the drying mechanism includes a heating chamber 22 fixedly connected to the side wall of the drying box 2 away from the washing box 1, a first fan 221 is installed in the heating chamber 22, a heating pipe 222 is also provided on the side of the heating chamber 2 close to the drying box 2, and a humidity sensor 218 is also provided on the rake teeth 211, and the humidity sensor 218 is electrically connected to the drive motor.

[0041] When the drying mechanism provided by the present invention is in use, the heating tube 222 and the first fan 221 are energized, heat is emitted through the heating tube 222, and the first fan 221 blows the heat into the drying box 2, thereby drying the sand material in the drying box 2. Drying and turning the material need to be carried out simultaneously. During the turning process, the humidity sensor 218 is driven to move, and the humidity of the sand material is monitored in real time through the humidity sensor 218. When the humidity sensor 218 reaches the set threshold, the system program controls the shutdown of the drive motor to stop the conveying of the conveyor belt 14, and then the material is discharged.

[0042] like Figure 2 As shown, a top frame 23 is fixed to the top of the drying box 2 , and a second fan 231 is provided in the top frame 23 .

[0043] When the second fan 231 provided by the present invention is in use, the first fan 221 blows heat into the drying box 2, and the hot air enters horizontally and easily diffuses upward. The second fan 231 can easily blow the hot air above the drying box 2 toward the sand material, preventing the hot air from diffusing upward, thereby improving the drying efficiency.

[0044] Working principle: When brushing the workpiece, by turning on the electric push rod 185, the output end of the electric push rod 185 drives the rack 186 to move, the rack 186 drives the second gear 187 to rotate, the second gear 187 drives the connecting pipe 183 to rotate, the connecting pipe 183 drives the water delivery box 181 to swing back and forth, and the water delivery box 181 drives the rotating nozzle 182 to swing back and forth, thereby expanding the scope of flushing. The flowing water makes it easy to quickly drop the sand material that has fallen off after brushing. The sand material is transported upward with the conveyor belt 14, and then the filtered water falls into the cleaning box 1, and is finally pumped into the water delivery box 181 through the delivery pipe 184 by the water pump 189, so as to realize the recycling of flushing water. By turning on the first motor 172, the output shaft of the first motor 172 drives the roller to rotate, the roller drives the first gear 173 to rotate, the first gear 173 drives another gear to rotate, and the other gear drives the connected roller to rotate. The two rollers rotate synchronously in opposite directions to drive the cleaning brush 171 to rotate, and the sand material on the surface of the workpiece is brushed with water spraying.

[0045] A fixed plate 15 is provided on the conveyor belt 14 to block the sand material and prevent it from being washed down from the bottom of the conveyor belt 14 by the water flow. A filter screen 16 is provided to facilitate the water inside the fixed plate 15 to flow out from the filter screen 16. A fixed ring plate 12 is provided, and the fixed ring plate 12 is in contact with the surface of the inner fixed plate 15, so that some of the fallen sand material can be scraped up and transported through the fixed plate 15.

[0046] During the drying process, the heating tube 222 and the first fan 221 are energized, heat is emitted through the heating tube 222, and the first fan 221 blows the heat into the drying box 2. The hot air above the drying box 2 is blown toward the sand material through the second fan 231 to prevent the hot air from diffusing upward, thereby improving the drying efficiency. At the same time, the second motor 212 is turned on, and the output shaft of the second motor 212 drives the movable plate 21 to move. During the movement of the movable plate 21, the movable plate 21 slides on the guide rod 214, and the guide rod 214 limits the movable plate 21 to slide in the horizontal direction, and drives the rake teeth 211 to move through the movable plate 21. The sand material in the drying box 2 is turned over by the rake teeth 211 to improve the drying efficiency; during the reciprocating motion of the rake teeth 211, the mounting seat 216 is driven to reciprocate by the rake teeth 211, and the cleaning brush 217 is driven to reciprocate by the mounting seat 216, and the sand material at the bottom of the conveyor belt 14 is swept away by the cleaning brush 217, wherein a torsion spring is provided between the rotating shaft and the mounting seat 216, and when the fixed plate 15 passes the cleaning brush 217, the cleaning brush 217 will rotate, but the cleaning brush 217 will quickly move to one side of the conveyor belt 14, without the pressure of the fixed plate 15, the cleaning brush 217 will quickly reset under the action of the torsion spring and continue cleaning. During the discharging process, the second motor 212 is turned on, and the output shaft of the second motor 212 drives the movable plate 21 to move. During the movement of the movable plate 21, the movable plate 21 slides on the guide rod 214, and the guide rod 214 limits the movable plate 21 to slide in the horizontal direction, and the rake teeth 211 are driven to move by the movable plate 21, and the sand material is pushed to fall quickly from the discharge port by the rake teeth 211; wherein the reciprocating screw rod 213 during the rotation process drives the first rotating wheel 215 to rotate through the reciprocating screw rod 213, and the first rotating wheel 215 drives the belt 253 to rotate, and the belt 253 drives the second rotating wheel 252 to rotate, and the second rotating wheel 252 drives the connecting shaft to rotate, and the cooperation of the connecting shaft and the third gear 251 realizes the synchronous reverse rotation of the two crushing rollers 25, thereby crushing the large particles in the sand material and improving the demagnetization effect.

[0047] After the workpiece is formed, the sand on the surface is removed by destroying the sand material, and then the workpiece is placed in the cleaning bin 17 for brushing to remove the sand on the surface. The sand falls on the conveyor belt 14 below under the action of water flow and gravity, and is transported upward to the drying box 2 under the action of the conveyor belt 14. It is dried by the drying mechanism in the drying box 2, and is turned over by the turning mechanism during the drying process to improve the drying effect. The dried sand falls on the crushing roller 25 and is crushed, so that the sand falling into the screening bin 26 is dry and loose. In the process of the sand falling into the screening bin 26, the fourth motor 263 is turned on, and the output shaft of the fourth motor 263 drives the magnetic separation drum 261 to rotate. The magnetic separation drum 261 magnetically attracts iron impurities in the sand, and the sand is thrown out under the action of centrifugal force, and finally discharged from the bottom of the screening bin 26, thereby realizing the function of removing iron from the sand.

[0048] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic recovery device for foundry sand, comprising a cleaning box (1), wherein a cleaning chamber (17) and a conveyor belt (14) are provided in the cleaning box (1); a drying box (2) is fixedly connected to one side wall of the cleaning box (1), wherein a turning mechanism and a drying mechanism are provided in the drying box (2); a screening chamber (26) is fixedly connected to the bottom of the drying box (2); two crushing rollers (25) are further provided between the drying box (2) and the screening chamber (26) for crushing large sand particles; a demagnetization mechanism is provided in the screening chamber (26), and the device is characterized in that: The demagnetization mechanism comprises a mounting plate (262) fixedly connected to the inner wall of the screening bin (26), a fourth motor (263) fixedly connected to the bottom of the mounting plate (262), an output shaft of the fourth motor (263) rotatably connected to the mounting plate (262) via a bearing, and a magnetic separation drum (261) fixedly connected to the output shaft of the fourth motor (263); and a control valve (264) is installed at the bottom end of the screening bin (26).

2. The automatic recovery device for foundry sand according to claim 1, characterized in that: The bottom of the cleaning box (1) is fixedly connected to two pillars (11), and the top of the pillar (11) is fixedly connected to a fixed ring plate (12); side plates (13) are symmetrically fixedly connected to the two side walls of the fixed ring plate (12), and the conveyor belt (14) is arranged between the two side plates (13) through a roller, and a driving motor is provided on one side of the conveyor belt (14); a plurality of fixed plates (15) are fixedly connected in a circular arrangement on the surface of the conveyor belt (14); the conveyor belt (14) is arranged at an angle, and the top end of the conveyor belt (14) passes through the drying box (2); and the top ends of the side plates (13) are each installed with a filter screen (16).

3. The automatic foundry sand recovery device according to claim 2, characterized in that: The cleaning chamber (17) is fixedly connected to the inner wall of the top end of the cleaning box (1), and the bottom of the cleaning chamber (17) is arranged above the conveyor belt (14); two cleaning brushes (171) are rotatably connected to the cleaning chamber (17) via a roller shaft, and one end of each roller shaft is fixedly connected to a first gear (173), and the two first gears (173) are meshed with each other; a first motor (172) is fixedly connected to the outer wall of the cleaning chamber (17), and the output shaft of the first motor (172) is fixedly connected to one end of the roller shaft.

4. The automatic recovery device for foundry sand according to claim 3, characterized in that: The bottom of the cleaning box (1) is fixedly connected to a fixing frame (18); a water delivery box (181) is rotatably connected between the two inner side walls of the fixing frame (18) via a bearing; the bottom end of the water delivery box (181) is rotatably connected to a plurality of rotating nozzles (182); one end of the water delivery box (181) is connected and fixedly connected to a connecting pipe (183); a second gear (187) is fixedly connected to the outer wall of the connecting pipe (183); an electric push rod (185) is fixedly connected to the side wall of the fixing frame (18) ), the output end of the electric push rod (185) is fixedly connected to a rack (186), and the rack (186) is meshed with a second gear (187); the rack (186) is slidably connected to the fixed frame (18) through a limit rod (188); one end of the connecting pipe (183) is installed with a delivery pipe (184) through an adapter, and one end of the delivery pipe (184) is connected and fixed to the bottom end of the cleaning box (1), and a water pump (189) is installed on the outer wall of the delivery pipe (184).

5. The automatic foundry sand recovery device according to claim 4, characterized in that: The material turning mechanism comprises a reciprocating screw (213) rotatably connected to the inner wall of the drying box (2) via a bearing, a movable plate (21) being threadedly connected to the reciprocating screw (213), and a rake tooth (211) being fixedly connected to the bottom of the movable plate (21); two guide rods (214) being fixedly connected to the inner wall of the drying box (2), and the movable plate (21) being slidably connected to the two guide rods (214); a second motor (212) being fixedly connected to the outer wall of the drying box (2), and an output shaft of the second motor (212) being fixedly connected to one end of the reciprocating screw (213).

6. The automatic foundry sand recovery device according to claim 5, characterized in that: A mounting seat (216) is fixedly connected to the top of one end of the rake teeth (211) close to the conveyor belt (14), a cleaning brush (217) is rotatably connected to the mounting seat (216) via a rotating shaft, and a torsion spring is provided between the rotating shaft and the mounting seat (216).

7. The automatic foundry sand recovery device according to claim 6, characterized in that: An inclined plate (24) is fixedly connected to the inner wall of the bottom end of the drying box (2), and the bottom of the rake teeth (211) is in contact with the surface of the inclined plate (24); the end of the inclined plate (24) close to the cleaning box (1) is higher than the end away from the cleaning box (1); a discharge port is provided at the bottom end of the inclined plate (24); a blocking plate (241) is rotatably connected to the inner wall of the drying box (2), and the blocking plate (241) is provided below the discharge port; and a third motor (242) is provided at one end of the blocking plate (241).

8. The automatic foundry sand recovery device according to claim 7, characterized in that: The crushing roller (25) is rotatably connected to the bottom end of the drying box (2) via a connecting shaft; one end of each connecting shaft is fixedly connected to a third gear (251), and the two third gears (251) are meshed with each other; one end of one of the connecting shafts is fixedly connected to a second rotating wheel (252); one end of the reciprocating screw (213) is fixedly connected to a first rotating wheel (215), and a belt (253) is provided between the first rotating wheel (215) and the second rotating wheel (252).

9. The automatic foundry sand recovery device according to claim 8, characterized in that: The drying mechanism comprises a heating chamber (22) fixedly connected to a side wall of the drying box (2) away from the washing box (1); a first fan (221) is installed in the heating chamber (22); a heating pipe (222) is further provided on a side of the heating chamber (22) close to the drying box (2); a humidity sensor (218) is further provided on the rake teeth (211); and the humidity sensor (218) is electrically connected to the drive motor.

10. The automatic foundry sand recovery device according to claim 9, characterized in that: A top frame (23) is fixedly connected to the top of the drying box (2), and a second fan (231) is provided in the top frame (23).

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