Sand cleaning device and sand cleaning method

Abstract

The invention discloses a sand cleaning device and a cleaning method thereof, and specifically relates to the technical field of sand cleaning, comprising a first frame, a second frame being fixedly mounted on the side end of the first frame, a cleaning mechanism being fixedly mounted on the top of the first frame, a screening mechanism being arranged on the top of the second frame, the screening mechanism being rotatably mounted on the top of the cleaning mechanism, a material return mechanism being arranged in the screening mechanism, and two symmetrically distributed feeding mechanisms being arranged on the material return mechanism; the invention cleans the sand in the screening inner frame by arranging the screening mechanism and using the cleaning mechanism in cooperation, and at the same time, performs synchronous screening through the screening outer frame and the screening outer slots and the screening inner slots with different aperture sizes on the screening inner frame, and smaller sand falls into the screening outer frame through the screening inner slot, thereby realizing synchronous cleaning and screening of the sand, and effectively improving the processing effect of the sand.

Description

Technical Field

[0001] The invention relates to the technical field of sand cleaning, in particular to a sand cleaning device and a cleaning method thereof. Background Art

[0002] Sand cleaning refers to the process of cleaning, screening and processing sand. Usually, sand cleaning is to remove impurities, mud, dirt and other impurities on the surface of sand, improve the quality and purity of sand, so that it can be used in engineering fields such as construction, concrete, glass, etc. Commonly used sand cleaning devices mainly include: spiral sand washing machine, wheel sand washing machine, drum sand washing machine, vibrating sand washing machine, bucket sand washing machine.

[0003] Traditional sand cleaning mostly uses conveying equipment to transport the sand to be cleaned to the drum sand washing machine for cleaning. After cleaning, the machine is stopped and then turned over to unload the material for subsequent screening processing, resulting in slow overall sand cleaning efficiency. For this reason, we propose a sand cleaning device and a cleaning method thereof to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a sand cleaning device and a cleaning method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sand cleaning device, comprising a first frame, a second frame is fixedly mounted on the side end of the first frame, a cleaning mechanism is fixedly mounted on the top of the first frame, a screening mechanism is provided on the top of the second frame, the screening mechanism is rotatably mounted on the top of the cleaning mechanism, a material return mechanism is provided in the screening mechanism, and two symmetrically distributed feeding mechanisms are provided on the material return mechanism;

[0006] The screening mechanism includes two symmetrically distributed first rotating frames and two symmetrically distributed second rotating frames, the two second rotating frames are located between the two first rotating frames, a screening outer frame is rotatably installed between the two first rotating frames, a plurality of evenly distributed screening outer grooves are provided on the screening outer frame, a screening inner frame is rotatably installed between the two second rotating frames, a plurality of evenly distributed screening inner grooves are provided on the screening inner frame, the aperture size of the screening inner grooves is larger than the aperture size of the screening outer grooves, the screening inner frame is located in the screening outer frame, and the two ends of the screening inner frame extend out of the ends of the screening outer frame.

[0007] As a preferred technical solution of the present invention, a third rotating frame is fixedly installed on the top of the first rotating frame, an auxiliary shaft is rotatably installed on the top of the third rotating frame, a first gear is fixedly installed on the end of the auxiliary shaft, a first gear ring is fixedly installed on the end of the screening outer frame, the first gear and the first gear ring are meshingly connected, a first sprocket is fixedly installed on the end of the auxiliary shaft, a second sprocket is fixedly installed on the end of the screening inner frame, a transmission chain is meshedly connected to the outer sides of the two first sprockets and the second sprocket vertically corresponding to the two first sprockets, and a second gear is fixedly installed on the outer side of the auxiliary shaft, a first motor is fixedly installed on the side of the third rotating frame close to the second gear, a third gear is fixedly installed on the driving end of the first motor, and the third gear is meshingly connected to the second gear.

[0008] As a preferred technical solution of the present invention, the material return mechanism includes two symmetrically distributed first discharge frames and two symmetrically distributed second discharge frames, the tops of the first discharge frames are rotatably mounted on the ends of the screening outer frame, the tops of the second discharge frames are rotatably mounted on the ends of the screening inner frame, the second discharge frames extend out of the first discharge frame at one end away from the screening inner frame, the first discharge frame is fixedly mounted on both sides of the first frame, the inner side of the screening outer frame and the outer side of the screening inner frame are provided with push rings, the movable card on the screening inner frame is provided with two push plates, the fixed card between the two push plates is provided with two symmetrically distributed connecting pipes, and the push ring is fixed The clamp is provided with two symmetrically distributed clamping rings, wherein a first screw is threadedly installed on the middle part of one of the clamping rings, and the two ends of the first screw are rotatably installed on the first discharge frames on both sides, and a first guide rod is movably penetrated through the middle part of the other clamping ring, and the two ends of the first guide rod are fixedly installed on the first discharge frames on both sides, and a second screw is threadedly installed on the middle part of one of the connecting tubes, and the two ends of the second screw are rotatably installed on the first discharge frame and the second discharge frame on both sides, and a second guide rod is movably penetrated through the middle part of the other connecting tube, and the two ends of the second guide rod are fixedly installed on the first discharge frame and the second discharge frame on both sides.

[0009] As a preferred technical solution of the present invention, the first screw and the second screw have opposite thread directions, one end of the first screw and the second screw extends out of the outside of the first discharge frame and is fixedly installed with a transmission gear, and the two transmission gears are meshed and connected.

[0010] As a preferred technical solution of the present invention, a second motor is fixedly mounted on one side of the outer wall of the first discharge frame close to the first screw, and a driving end of the second motor is fixedly mounted to one end of the first screw.

[0011] As a preferred technical solution of the present invention, the feeding mechanism includes a feeding barrel, which is fixedly connected to the top of the first discharge frame and the second discharge frame, one end of the feeding barrel extends to the screening inner frame, and the other end of the feeding barrel is fixedly installed with the feeding frame, a feeding shaft is rotatably installed in the middle of the feeding barrel, and an auger is fixedly installed on the outer side of the feeding shaft, and the auger is movably connected in the feeding barrel.

[0012] As a preferred technical solution of the present invention, a third motor is fixedly mounted on one end of the feed barrel close to the feed frame, and a driving end of the third motor is fixedly mounted on one end of the feed shaft.

[0013] As a preferred technical solution of the present invention, a feeding groove corresponding to the feeding barrel is opened on the top of the push plate, and the feeding barrel in the corresponding feeding mechanism movably passes through the feeding groove.

[0014] As a preferred technical solution of the present invention, the cleaning mechanism includes a slow liquid bottom frame, which is fixedly installed on the top of the first frame, and a cleaning outer frame is fixedly installed on the top of the slow liquid bottom frame. The screening outer frame is rotatably clamped between the slow liquid bottom frame and the cleaning outer frame, and a plurality of evenly distributed cleaning grooves are opened on the inner side of the cleaning outer frame. A liquid inlet is fixedly installed on the top of the cleaning outer frame, and a liquid inlet main pipe is fixedly installed on the top of the liquid inlet. A drain pipe is fixedly clamped on the bottom of the slow liquid bottom frame.

[0015] A method for cleaning a sand cleaning device comprises the following steps:

[0016] Step 1: Control and start the third motor at a position far from the push plate to drive the feed shaft and the auger to rotate, and the sand to be cleaned enters the feed barrel through the feed frame, and is transported by the auger to guide the sand to be cleaned into the screening inner frame;

[0017] Step 2, control the first motor to start driving the third gear to drive the second gear and the auxiliary shaft to rotate, cooperate with the transmission of the transmission chain, drive the first sprocket to drive the second sprocket and the screening inner frame to rotate, and drive the first gear ring and the screening outer frame to rotate in the opposite direction through the first gear, thereby driving the screening outer frame and the screening inner frame to rotate synchronously in the opposite direction, control the start of the cleaning liquid output system, the cleaning liquid is introduced into the cleaning outer frame through the liquid inlet main pipe and the liquid inlet, and is sprayed into the screening outer frame and the screening inner frame through multiple cleaning grooves to clean the sand in the screening inner frame. At the same time, the screening outer grooves and the screening inner grooves with different aperture sizes on the screening outer frame and the screening inner frame are used for synchronous screening, and smaller sand particles fall into the screening outer frame through the screening inner groove;

[0018] Step 3: After cleaning, the second motor is controlled to start and drive the first screw to rotate, and the meshing connection of the two transmission gears is coordinated to drive the other first screw to rotate synchronously in the opposite direction. Since the thread directions of the first screw and the second screw are opposite, the push ring and the two push plates are synchronously driven to move to one side, and the push plate slowly pushes the sand in the screening inner frame to be discharged through the second discharge frame, and the push ring slowly pushes the sand between the inner side of the screening outer frame and the outer side of the screening inner frame to be discharged through the first discharge frame;

[0019] During discharging, when the feeding grooves of the two push plates are both sleeved on the ends of the feed barrel, the third motor at the discharging end is turned on to drive the feed shaft and the auger to rotate, and the sand particles to be cleaned pass through the feed frame into the feed barrel. Under the transportation of the auger, the sand particles to be cleaned are introduced into the other side of the feed frame and divided by the two push plates, so as to realize automatic feeding of the sand particles and carry out subsequent discharging at the same time without stopping the cleaning device.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By setting up a screening mechanism and using a cleaning mechanism in conjunction, the sand in the screening inner frame is cleaned. During the cleaning process, the sand is screened synchronously through the screening outer frame and the screening outer slots and screening inner slots with different aperture sizes on the screening inner frame. Smaller sand particles fall into the screening outer frame through the screening inner slot, realizing synchronous cleaning and screening of the sand particles, which effectively improves the processing effect of the sand particles.

[0022] 2. By setting up a material return mechanism and using a feeding mechanism in conjunction, the sand particles can be automatically discharged after screening and cleaning, and the sand particles can be automatically loaded without stopping the cleaning device, thereby improving the cleaning effect of the cleaning device on the sand particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the structural connection after the present invention is split.

[0026] Figure 3 It is a schematic diagram of the structural connection of the screening mechanism and the material returning mechanism in the present invention.

[0027] Figure 4 For the present invention Figure 3Enlarged view of point A in the middle.

[0028] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle.

[0029] Figure 6 It is a structural schematic diagram of the screening mechanism in the present invention.

[0030] Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle.

[0031] Figure 8 It is a structural schematic diagram of the feeding mechanism in the present invention.

[0032] Fig. 9 It is a structural schematic diagram of the cleaning mechanism in the present invention.

[0033] In the figure: 1, first frame; 11, second frame; 2, screening mechanism; 3, material return mechanism; 4, material feeding mechanism; 5, cleaning mechanism; 21, first rotating frame; 22, second rotating frame; 23, screening outer frame; 231, screening outer groove; 24, screening inner frame; 241, screening inner groove; 25, third rotating frame; 251, auxiliary shaft; 26, first gear; 261, first gear ring; 27, first sprocket; 271, second sprocket; 272, transmission chain; 28, second gear; 281, first motor; 282, third gear; 31, first Discharge frame; 32. Second discharge frame; 33. Push ring; 331. Snap ring; 332. First screw; 333. First guide rod; 34. Push plate; 341. Connecting pipe; 342. Second screw; 343. Second guide rod; 35. Transmission gear; 36. Second motor; 41. Feed barrel; 42. Feed frame; 43. Feed shaft; 431. Auger; 44. Third motor; 401. Feeding slot; 51. Liquid slowing bottom frame; 511. Discharge pipe; 52. Cleaning outer frame; 501. Cleaning slot; 521. Liquid inlet; 53. Liquid inlet main pipe. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example: Figure 1-9As shown, the present invention provides a sand cleaning device, comprising a first frame 1, a second frame 11 is fixedly mounted on the side end of the first frame 1, a cleaning mechanism 5 is fixedly mounted on the top of the first frame 1, a screening mechanism 2 is provided on the top of the second frame 11, the screening mechanism 2 is rotatably mounted on the top of the cleaning mechanism 5, a material return mechanism 3 is provided in the screening mechanism 2, and two symmetrically distributed feeding mechanisms 4 are provided on the material return mechanism 3;

[0036] The screening mechanism 2 includes two symmetrically distributed first rotating frames 21 and two symmetrically distributed second rotating frames 22, the two second rotating frames 22 are located between the two first rotating frames 21, a screening outer frame 23 is rotatably installed between the two first rotating frames 21, a plurality of evenly distributed screening outer grooves 231 are provided on the screening outer frame 23, a screening inner frame 24 is rotatably installed between the two second rotating frames 22, a plurality of evenly distributed screening inner grooves 241 are provided on the screening inner frame 24, the aperture size of the screening inner grooves 241 is larger than the aperture size of the screening outer grooves 231, the screening inner frame 24 is located in the screening outer frame 23, and the two ends of the screening inner frame 24 extend out of the ends of the screening outer frame 23. When in use, the sand particles to be cleaned are put into the screening inner frame 24.

[0037] A third rotating frame 25 is fixedly installed on the top of the first rotating frame 21, and an auxiliary shaft 251 is rotatably installed on the top of the third rotating frame 25. A first gear 26 is fixedly installed on the end of the auxiliary shaft 251. A first gear ring 261 is fixedly installed on the end of the screening outer frame 23. The first gear 26 and the first gear ring 261 are meshingly connected. A first sprocket 27 is fixedly installed on the end of the auxiliary shaft 251. A second sprocket 271 is fixedly installed on the end of the screening inner frame 24. A transmission chain 272 is meshingly connected to the outer sides of the two first sprockets 27 and the second sprocket 271 vertically corresponding to each other. A second gear 28 is fixedly installed on the outer side of the auxiliary shaft 251. A first motor 281 is fixedly installed on one side of the third rotating frame 25 close to the second gear 28, and a third gear 282 is fixedly installed on the driving end of the first motor 281. The third gear 282 is meshingly connected with the second gear 28. When in use, the first motor 281 is controlled to start driving the third gear 282 to drive the second gear 28 and the auxiliary shaft 251 to rotate, and the transmission chain 272 is cooperated to drive the first sprocket 27 to drive the second sprocket 271 and the screening inner frame 24 to rotate, and the first gear 26 drives the first gear ring 261 and the screening outer frame 23 to rotate in the opposite direction, thereby driving the screening outer frame 23 and the screening inner frame 24 to rotate synchronously in the opposite direction.

[0038] The cleaning mechanism 5 includes a liquid-slowing bottom frame 51, which is fixedly mounted on the top of the first frame 1, and a cleaning outer frame 52 is fixedly mounted on the top of the liquid-slowing bottom frame 51. The screening outer frame 23 is rotatably connected between the liquid-slowing bottom frame 51 and the cleaning outer frame 52. A plurality of cleaning grooves 501 are evenly distributed on the inner side of the cleaning outer frame 52. A liquid inlet 521 is fixedly mounted on the top of the cleaning outer frame 52, and a liquid inlet main pipe 53 is fixedly mounted on the top of the liquid inlet 521. A liquid discharge pipe 511 is fixedly mounted on the bottom of the liquid-slowing bottom frame 51. When in use, the end of the liquid inlet main pipe 53 is fixedly clamped. It is connected to the output end of the cleaning liquid output system to control the opening of the cleaning liquid output system. The cleaning liquid is introduced into the cleaning outer frame 52 through the liquid inlet main pipe 53 and the liquid inlet port 521, and is sprayed into the screening outer frame 23 and the screening inner frame 24 through multiple cleaning grooves 501 to clean the sand particles in the screening inner frame 24. While cleaning, the screening outer grooves 231 and the screening inner grooves 241 with different aperture sizes on the screening outer frame 23 and the screening inner frame 24 are used for synchronous screening. Smaller sand particles fall into the screening outer frame 23 through the screening inner groove 241, thereby realizing synchronous cleaning and screening of the sand particles, and effectively improving the processing effect of the sand particles.

[0039] The material discharging mechanism 3 includes two symmetrically distributed first discharging frames 31 and two symmetrically distributed second discharging frames 32. The tops of the first discharging frames 31 are respectively rotatably mounted on the ends of the screening outer frame 23, and the tops of the second discharging frames 32 are respectively rotatably mounted on the ends of the screening inner frame 24. By setting the two symmetrically distributed first discharging frames 31 and the two symmetrically distributed second discharging frames 32, it is convenient to discharge materials at both ends of the screening outer frame 23 and the screening inner frame 24, so that the feeding at the other end is not affected during the subsequent discharging. The second discharging frame 32 extends out of the outside of the first discharging frame 31 at one end away from the screening inner frame 24, and the first discharging frame 31 is fixedly mounted on both sides of the first frame 1.

[0040] A push ring 33 is movably provided on the inner side of the screening outer frame 23 and the outer side of the screening inner frame 24. Two push plates 34 are movably provided in the screening inner frame 24. Two symmetrically distributed connecting pipes 341 are fixedly provided between the two push plates 34. Two symmetrically distributed clamping rings 331 are fixedly provided on the push ring 33. A first screw 332 is threadedly installed in the middle of one of the clamping rings 331. The two ends of the first screw 332 are rotatably installed on the first discharge frames 31 on both sides. The middle of the other clamping ring 331 A first guide rod 333 is movably passed through, and the two ends of the first guide rod 333 are respectively fixedly mounted on the first discharge frames 31 on both sides, a second screw 342 is threadedly mounted on the middle part of one of the connecting tubes 341, and the two ends of the second screw 342 are rotatably mounted on the first discharge frames 31 and the second discharge frames 32 on both sides, and a second guide rod 343 is movably passed through the middle part of the other connecting tube 341, and the two ends of the second guide rod 343 are respectively fixedly mounted on the first discharge frames 31 and the second discharge frames 32 on both sides; the first screw 332 and the second screw 342 have opposite thread directions, and one end of the first screw 332 and the second screw 342 extends out of the outside of the first discharge frame 31 and is fixedly mounted with a transmission gear 35, and the two transmission gears 35 are meshed and connected; a second motor 36 is fixedly mounted on one side of the outer wall of the first discharge frame 31 close to the first screw 332, and the driving end of the second motor 36 is fixedly mounted on one end of the first screw 332. After cleaning, the second motor 36 is controlled to start driving the first screw The rod 332 rotates, and cooperates with the meshing connection of the two transmission gears 35 to drive the other first screw 332 to rotate synchronously in the opposite direction. Since the thread directions of the first screw 332 and the second screw 342 are opposite, the push ring 33 and the two push plates 34 are synchronously driven to move to one side. The push plate 34 slowly pushes the sand in the screening inner frame 24 to be discharged through the second discharge frame 32, and the push ring 33 slowly pushes the sand between the inner side of the screening outer frame 23 and the outer side of the screening inner frame 24 to be discharged through the first discharge frame 31. After screening and cleaning, the classified sand is automatically discharged.

[0041] The feeding mechanism 4 includes a feeding barrel 41, which is fixedly connected to the top of the first discharge frame 31 and the second discharge frame 32. One end of the feeding barrel 41 extends into the screening inner frame 24, and the other end of the feeding barrel 41 is fixedly installed with the feeding frame 42. A feeding shaft 43 is rotatably installed in the middle of the feeding barrel 41, and an auger 431 is fixedly installed on the outer side of the feeding shaft 43, and the auger 431 is movably connected to the feeding barrel 41; a third motor 44 is fixedly installed at one end of the feeding barrel 41 close to the feeding frame 42, and the driving end of the third motor 44 and one end of the feeding shaft 43 are fixedly installed; the top of the pushing plate 34 is provided with and The feeding groove 401 corresponding to the feeding barrel 41 corresponds to the feeding barrel 41 in the feeding mechanism 4 that moves through the feeding groove 401. During discharging, when the feeding grooves 401 of the two push plates 34 are both sleeved on the ends of the feeding barrel 41, the third motor 44 at the discharging end position is turned on to drive the feeding shaft 43 and the auger 431 to rotate, and the sand particles that need to be cleaned enter the feeding barrel 41 through the feeding frame 42. Under the transportation of the auger 431, the sand particles that need to be cleaned are introduced into the other side of the feeding frame 42 and divided by the two push plates 34, so as to realize automatic feeding of the sand particles and carry out subsequent discharging at the same time without stopping the cleaning device, thereby improving the cleaning effect of the cleaning device on the sand particles.

[0042] A method for cleaning a sand cleaning device comprises the following steps:

[0043] Step 1: Control and start the third motor 44 at a position far from the push plate 34, drive the feed shaft 43 and the auger 431 to rotate, and the sand particles to be cleaned enter the feed barrel 41 through the feed frame 42, and are transported by the auger 431 to be introduced into the screening inner frame 24;

[0044] Step 2: Control the first motor 281 to drive the third gear 282 to drive the second gear 28 and the auxiliary shaft 251 to rotate, cooperate with the transmission of the transmission chain 272, drive the first sprocket 27 to drive the second sprocket 271 and the screening inner frame 24 to rotate, and drive the first gear ring 261 and the screening outer frame 23 to rotate in the opposite direction through the first gear 26, thereby driving the screening outer frame 23 and the screening inner frame 24 to rotate in the opposite direction synchronously, and control the opening of the cleaning liquid output system, the cleaning liquid is introduced into the cleaning outer frame 52 through the liquid inlet main pipe 53 and the liquid inlet 521, and is sprayed into the screening outer frame 23 and the screening inner frame 24 through a plurality of cleaning grooves 501, so as to clean the sand in the screening inner frame 24. At the same time, the screening outer grooves 231 and the screening inner grooves 241 with different aperture sizes on the screening outer frame 23 and the screening inner frame 24 are synchronously screened, and smaller sand particles fall into the screening outer frame 23 through the screening inner groove 241;

[0045] Step 3: After cleaning, the second motor 36 is controlled to start and drive the first screw 332 to rotate, and the meshing connection of the two transmission gears 35 is cooperated to drive the other first screw 332 to rotate synchronously in the opposite direction. Since the first screw 332 and the second screw 342 have opposite thread directions, the push ring 33 and the two push plates 34 are synchronously driven to move to one side, and the push plate 34 slowly pushes the sand in the screening inner frame 24 to be discharged through the second discharge frame 32, and the push ring 33 slowly pushes the sand between the inner side of the screening outer frame 23 and the outer side of the screening inner frame 24 to be discharged through the first discharge frame 31;

[0046] While discharging, when the feeding grooves 401 of the two push plates 34 are both sleeved on the ends of the feed barrel 41, the third motor 44 at the discharge end position is turned on to drive the feed shaft 43 and the auger 431 to rotate, and the sand particles to be cleaned enter the feed barrel 41 through the feed frame 42. Under the transportation of the auger 431, the sand particles to be cleaned are introduced into the other side of the feed frame 42 and divided by the two push plates 34, so as to realize automatic feeding of the sand particles and carry out subsequent discharging at the same time without stopping the cleaning device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sand cleaning device, comprising a first frame (1), characterized in that: A second frame (11) is fixedly mounted on the side end of the first frame (1), a cleaning mechanism (5) is fixedly mounted on the top of the first frame (1), a screening mechanism (2) is provided on the top of the second frame (11), the screening mechanism (2) is rotatably mounted on the top of the cleaning mechanism (5), a material return mechanism (3) is provided in the screening mechanism (2), and two symmetrically distributed feeding mechanisms (4) are provided on the material return mechanism (3); The screening mechanism (2) comprises two symmetrically distributed first rotating frames (21) and two symmetrically distributed second rotating frames (22), the two second rotating frames (22) being located between the two first rotating frames (21), a screening outer frame (23) being rotatably mounted between the two first rotating frames (21), the screening outer frame (23) being provided with a plurality of evenly distributed screening outer slots (231), a screening inner frame (24) being rotatably mounted between the two second rotating frames (22), the screening inner frame (24) being provided with a plurality of evenly distributed screening inner slots (241), the aperture size of the screening inner slots (241) being larger than the aperture size of the screening outer slots (231), the screening inner frame (24) being located in the screening outer frame (23), and the two ends of the screening inner frame (24) extending out of the ends of the screening outer frame (23); A third rotating frame (25) is fixedly mounted on the top of the first rotating frame (21); an auxiliary shaft (251) is rotatably mounted on the top of the third rotating frame (25); a first gear (26) is fixedly mounted on the end of the auxiliary shaft (251); a first gear ring (261) is fixedly mounted on the end of the screening outer frame (23); the first gear (26) and the first gear ring (261) are meshingly connected; a first sprocket (27) is fixedly mounted on the end of the auxiliary shaft (251); and an end of the screening inner frame (24) is fixedly mounted on the first sprocket wheel (27). A second sprocket (271) is fixedly mounted, and a transmission chain (272) is meshedly connected to the outer side of the second sprocket (27) vertically corresponding to the two first sprockets (27). A second gear (28) is fixedly mounted on the outer side of the auxiliary shaft (251). A first motor (281) is fixedly mounted on a side of the third rotating frame (25) close to the second gear (28). A third gear (282) is fixedly mounted on the driving end of the first motor (281), and the third gear (282) is meshedly connected to the second gear (28); The material return mechanism (3) comprises two symmetrically distributed first material discharge frames (31) and two symmetrically distributed second material discharge frames (32), the tops of the first material discharge frames (31) are rotatably mounted on the ends of the screening outer frame (23), the tops of the second material discharge frames (32) are rotatably mounted on the ends of the screening inner frame (24), one end of the second material discharge frame (32) away from the screening inner frame (24) extends out of the outside of the first material discharge frame (31), the first material discharge frame (31) is fixedly mounted on both sides of the first frame (1), the inner side of the screening outer frame (23) and the outer side of the screening inner frame (24) are movablely clamped with push rings (33), the movable clamp in the screening inner frame (24) is provided with two push plates (34), two symmetrically distributed connecting pipes (341) are fixedly clamped between the two push plates (34), and two symmetrically distributed clamps are fixedly clamped on the push ring (33). (331), a first screw rod (332) is threadedly mounted on the middle part of one of the clamping rings (331), and the two ends of the first screw rod (332) are rotatably mounted on the first discharge frames (31) on both sides, respectively; a first guide rod (333) is movably penetrated through the middle part of the other clamping ring (331), and the two ends of the first guide rod (333) are fixedly mounted on the first discharge frames (31) on both sides, respectively; a second screw rod (342) is threadedly mounted on the middle part of one of the connecting tubes (341), and the two ends of the second screw rod (342) are rotatably mounted on the first discharge frames (31) and the second discharge frames (32) on both sides, respectively; a second guide rod (343) is movably penetrated through the middle part of the other connecting tube (341), and the two ends of the second guide rod (343) are fixedly mounted on the first discharge frames (31) and the second discharge frames (32) on both sides, respectively.

2. A sand cleaning device according to claim 1, characterized in that: The first screw rod (332) and the second screw rod (342) have opposite thread directions. One end of the first screw rod (332) and the second screw rod (342) extend out of the outside of the first discharge frame (31) and are fixedly mounted with a transmission gear (35). The two transmission gears (35) are meshed and connected.

3. A sand cleaning device according to claim 2, characterized in that: A second motor (36) is fixedly mounted on one side of the outer wall of the first discharge frame (31) close to the first screw rod (332), and a driving end of the second motor (36) is fixedly mounted to one end of the first screw rod (332).

4. A sand cleaning device according to claim 1, characterized in that: The feeding mechanism (4) comprises a feeding barrel (41), wherein the feeding barrel (41) is fixedly connected to the top of the first discharge frame (31) and the second discharge frame (32), one end of the feeding barrel (41) extends into the screening inner frame (24), the other end of the feeding barrel (41) is fixedly mounted with the feeding frame (42), a feeding shaft (43) is rotatably mounted in the middle of the feeding barrel (41), an auger (431) is fixedly mounted on the outer side of the feeding shaft (43), and the auger (431) is movably connected to the feeding barrel (41).

5. A sand cleaning device according to claim 4, characterized in that: A third motor (44) is fixedly mounted on one end of the feed barrel (41) close to the feed frame (42), and a driving end of the third motor (44) is fixedly mounted on one end of the feed shaft (43).

6. A sand cleaning device according to claim 4, characterized in that: The top of the push plate (34) is provided with a feeding groove (401) corresponding to the feeding cylinder (41), and the feeding cylinder (41) in the corresponding feeding mechanism (4) movably penetrates the feeding groove (401).

7. A sand cleaning device according to claim 1, characterized in that: The cleaning mechanism (5) comprises a liquid-slowing bottom frame (51), the liquid-slowing bottom frame (51) being fixedly mounted on the top of the first frame (1), a cleaning outer frame (52) being fixedly mounted on the top of the liquid-slowing bottom frame (51), the screening outer frame (23) being rotatably clamped between the liquid-slowing bottom frame (51) and the cleaning outer frame (52), a plurality of cleaning through grooves (501) being evenly distributed are provided on the inner side of the cleaning outer frame (52), a liquid inlet (521) being fixedly mounted on the top of the cleaning outer frame (521), a liquid inlet main pipe (53) being fixedly mounted on the top of the liquid inlet (521), and a liquid discharge pipe (511) being fixedly clamped on the bottom of the liquid-slowing bottom frame (51).

8. A cleaning method using the sand cleaning device according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Control and start the third motor (44) at a position away from the push plate (34) to drive the feed shaft (43) and the auger (431) to rotate, so that the sand particles to be cleaned enter the feed barrel (41) through the feed frame (42), and are guided into the screening inner frame (24) under the conveyance of the auger (431); Step 2: Control the first motor (281) to start driving the third gear (282) to drive the second gear (28) and the auxiliary shaft (251) to rotate, and cooperate with the transmission of the transmission chain (272) to drive the first sprocket (27) to drive the second sprocket (271) and the screening inner frame (24) to rotate, and drive the first gear ring (261) and the screening outer frame (23) to rotate in the opposite direction through the first gear (26), thereby driving the screening outer frame (23) and the screening inner frame (24) to rotate in the opposite direction synchronously, and control the start of the cleaning liquid output The system comprises a cleaning liquid introduced into the cleaning outer frame (52) through a liquid inlet main pipe (53) and a liquid inlet port (521), and sprayed into the screening outer frame (23) and the screening inner frame (24) through a plurality of cleaning through grooves (501), so as to clean the sand particles in the screening inner frame (24). While cleaning, the sand particles are screened synchronously through the screening outer grooves (231) and the screening inner grooves (241) with different aperture sizes on the screening outer frame (23) and the screening inner frame (24), so that the smaller sand particles fall into the screening outer frame (23) through the screening inner grooves (241); Step 3: After cleaning is completed, the second motor (36) is controlled to start and drive the first screw (332) to rotate, and the meshing connection of the two transmission gears (35) is coordinated to drive the other first screw (332) to rotate synchronously in the opposite direction. Since the first screw (332) and the second screw (342) have opposite thread directions, the push ring (33) and the two push plates (34) are synchronously driven to move to one side, and the push plates (34) slowly push the sand in the screening inner frame (24) to be discharged through the second discharge frame (32), and the push ring (33) slowly pushes the sand between the inner side of the screening outer frame (23) and the outer side of the screening inner frame (24) to be discharged through the first discharge frame (31); While discharging, when the feeding grooves (401) of the two push plates (34) are both sleeved on the ends of the feed barrel (41), the third motor (44) at the discharging end position is turned on to drive the feed shaft (43) and the auger (431) to rotate, and the sand particles to be cleaned pass through the feed frame (42) into the feed barrel (41). Under the conveyance of the auger (431), the sand particles to be cleaned are introduced into the other side of the feed frame (42) and divided by the two push plates (34), thereby realizing automatic feeding of the sand particles and performing subsequent discharging at the same time without stopping the cleaning device.

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