Sand rolling device for metal casting

Abstract

The present invention relates to the field of metal casting technology, and in particular to a sand rolling device for metal casting, comprising a main frame, a feeding mechanism, a constant pressure mechanism and a recovery mechanism, wherein the feeding mechanism is arranged at the top of the main frame, the constant pressure mechanism is arranged at the inner side wall of the main frame, and the recovery mechanism is arranged at the inner side wall of the main frame. The present invention is provided with a lateral balancing mechanism, and a servo motor is used to drive the threaded rod to rotate, so as to adjust the distance between the two rolling rollers. At the same time, the buffer spring will play a buffering effect, thereby achieving the technical effect of adjusting the rolling force according to actual conditions, and effectively solving the technical problem of easy clogging of rolling in the prior art; by providing a cleaning mechanism, the cleaning plate can be made close to the rolling roller but not attached to the rolling roller by using the limiting wheel, so as to achieve the goal of not rubbing against the rolling roller when cleaning the rolling roller, and effectively solving the technical problem of damaging the rolling roller and reducing the rolling effect in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of metal casting, and in particular relates to a sand rolling device for metal casting. Background Art

[0002] Sand casting refers to a casting method that produces castings in sand molds. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Since the molding materials used in sand casting are cheap and easy to obtain, the mold is easy to manufacture, and it can adapt to the single-piece production, batch production and mass production of castings, it has long been the basic process in casting production.

[0003] At present, after the casting is demolded, the molding sand will stick together and needs to be crushed before it can be cast again; when the existing method uses a rolling roller to crush the molding sand, the broken sand will adhere to the surface of the rolling roller and is not easy to fall off. When the sand is rolled for a long time, the rolling effect will be reduced. At the same time, when too much molding sand is rolled, due to the fixed distance between the two rolling rollers, the molding sand is easily compacted during the rolling process, thereby affecting the next step of screening and reducing the crushing efficiency. For this purpose, a sand rolling device for metal casting is proposed. Summary of the invention

[0004] In order to solve the above-mentioned existing problems, the present invention provides a sand rolling device for metal casting. The present invention is provided with a feeding mechanism, and the rotation of the forward and reverse spiral rods is utilized to push the molding sand into the main frame to prevent the molding sand from being blocked. At the same time, the molding sand feeding amount can be controlled by the servo motor, thereby achieving the technical effect of controlling the orderly feeding of the molding sand and controlling the feeding amount, and effectively solving the technical problem that the molding sand is easily blocked during feeding in the prior art; by providing a lateral balancing mechanism, the servo motor is utilized to drive the threaded rod to rotate, so as to adjust the distance between the two rolling rollers, and at the same time the buffer spring will play a buffering effect, thereby achieving the technical effect that the rolling roller adjusts the rolling force according to the actual situation, and effectively solving the technical problem that the rolling is easily blocked in the prior art; by providing a cleaning mechanism, the limiting wheel is utilized to limit the cleaning plate, so that the cleaning plate can be close to the rolling roller but not attached to the rolling roller, thereby achieving the goal of not rubbing against the rolling roller when cleaning the rolling roller, and effectively solving the technical problem that the rolling roller is damaged during cleaning and the rolling effect is reduced in the prior art.

[0005] The technical solution adopted by the present invention is as follows: This solution provides a sand rolling device for metal casting, including a main frame, a feeding mechanism, a constant pressure mechanism and a recovery mechanism, the feeding mechanism is arranged at the top of the main frame, the constant pressure mechanism is arranged on the inner side wall of the main frame, the recovery mechanism is arranged on the inner side wall of the main frame, the recovery mechanism includes a breaking up mechanism and a screening mechanism, the breaking up mechanism is arranged on the inner side wall, the screening mechanism is arranged on the inner side wall of the main frame, the constant pressure mechanism includes a rolling mechanism, a transverse balancing mechanism and a cleaning mechanism, the transverse balancing mechanism is arranged on the inner side wall of the main frame, the rolling mechanism is arranged on the side wall of the transverse balancing mechanism, and the cleaning mechanism is arranged at the bottom of the transverse balancing mechanism.

[0006] Furthermore, the unloading mechanism includes a feed bin, a first servo motor, a first gear, a second gear, forward and reverse spiral rods and a feed port. The feed bin is fixed at the top of the main frame, the feed port is opened at the bottom of the feed bin, the first servo motor is fixed on the outer side wall of the feed bin, the forward and reverse spiral rods are rotatably arranged on the inner side wall of the feed bin, the first gear is coaxially fixed at the output end of the first servo motor, and the second gear is coaxially fixed on the side wall of the forward and reverse spiral rods.

[0007] Furthermore, the lateral balancing mechanism includes a sliding groove, a sliding frame, a second servo motor, a first threaded rod, a buffer groove, a buffer rod and a buffer spring. The sliding grooves are opened in pairs on the inner wall of the main frame, the sliding frame is slidably arranged on the inner wall of the sliding groove, the second servo motor is fixed in pairs on the inner wall of the main frame, the first threaded rod is coaxially fixed on the output end of the second servo motor, the buffer grooves are opened in pairs on the side walls at both ends of the sliding frame, both ends of the buffer rod are slidably arranged on the inner wall of the buffer groove, one end of the buffer spring is fixedly arranged on the inner side wall of the buffer groove, the other end of the buffer spring is fixedly arranged on the side wall of the buffer rod, and the side wall of the buffer rod is sleeved on the outer wall of the first threaded rod.

[0008] Furthermore, the rolling mechanism includes rolling rollers, a third servo motor, a third gear, a fourth gear and a baffle. The rolling rollers are rotatably arranged in pairs on the side walls at both ends of the sliding frame, one end of the rolling rollers penetrates the side wall of the sliding frame, the third servo motor is fixed in pairs on the side wall of the sliding frame, the third gear is coaxially fixed on the output end of the third servo motor, the fourth gear is coaxially fixed on the side wall of one end of the rolling roller, and the baffle is fixed on the side wall of the sliding frame.

[0009] Furthermore, the cleaning mechanism includes a cleaning plate, a limiting wheel, a limiting spring, a limiting rod and a limiting joint. The cleaning plate is rotatably arranged on the side wall of the sliding frame, the limiting wheels are rotatably arranged in pairs on the top walls at both ends of the cleaning plate, the limiting joints are rotatably arranged in pairs on the side walls at both ends of the sliding frame, one end of the limiting rod is slidably arranged on the inner wall of the limiting joint, and the other end of the limiting rod is rotatably arranged on the side wall of the cleaning plate, the limiting spring is sleeved on the outer wall of the limiting rod, one end of the limiting spring is fixedly arranged on the bottom wall of the limiting joint, and the other end of the limiting spring is fixedly arranged on the top end of the limiting rod.

[0010] Furthermore, the scattering mechanism includes a fourth servo motor, a scattering shaft, a first pulley, a second pulley and a scattering knife. The fourth servo motor is fixed on the side wall of the main frame, the scattering shaft is rotatable in pairs on the inner side wall of the main frame, one end of the scattering shaft passes through the side wall of the main frame, the first pulley is coaxially fixed on the output end of the fourth servo motor, the second pulley is coaxially fixed on the side wall of the scattering shaft, the scattering knife fixed array is arranged on the outer circumferential side wall of the scattering shaft, and the first pulley and the second pulley are driven by a belt.

[0011] Furthermore, the screening mechanism includes a screening trough, a fifth servo motor, a fifth gear, a sixth gear, a transmission rod and a screen. The screening trough is opened on the inner side wall of the main frame, the fifth servo motor is fixed on the side wall of the main frame, the fifth gear is coaxially fixed on the output end of the fifth servo motor, the sixth gear is rotatably arranged on the side wall of the main frame, the screen is slidably arranged on the inner wall of the screening trough, one end of the transmission rod is rotatably arranged on the side wall of the screen, and the other end of the transmission rod is rotatably arranged on the side wall of the fifth gear.

[0012] Furthermore, an electrical control panel is fixedly provided on the side wall of the main frame, and the electrical control panel is electrically connected to the first servo motor, the second servo motor, the third servo motor, the fourth servo motor and the fifth servo motor through wires.

[0013] The first gear is meshed with the second gear, the buffer rod is connected to the first threaded rod through threads, the third gear is meshed with one of the fourth gears, and the fifth gear is meshed with the sixth gear.

[0014] Furthermore, the top end surface of the cleaning plate is in a concave arc shape, the radius of the top end surface of the cleaning plate is the same as the radius of the circumference of the rolling roller, and the two ends of the forward and reverse spiral rods rotate in opposite directions.

[0015] Furthermore, the model of the electrical control panel is SYC89C52RC-401.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention is provided with a feeding mechanism, which utilizes the rotation of the forward and reverse spiral rods to push the molding sand into the main frame to prevent the molding sand from being blocked. At the same time, the amount of molding sand fed can be controlled by a servo motor, thereby achieving the technical effects of controlling the orderly feeding of molding sand and controlling the feeding amount, and effectively solving the technical problem of easy blockage of molding sand during feeding in the prior art.

[0018] (2) The present invention is provided with a lateral balancing mechanism, and uses a servo motor to drive the threaded rod to rotate, so as to adjust the distance between the two rolling rollers. At the same time, the buffer spring will play a buffering effect, thereby achieving the technical effect of adjusting the rolling pressure of the rolling roller according to the actual situation, and effectively solving the technical problem of easy clogging of the rolling in the prior art;

[0019] (3) The present invention is provided with a cleaning mechanism, and the limiting wheel is used to limit the position of the cleaning plate so that the cleaning plate is close to the rolling roller but not in contact with the rolling roller, so that the cleaning plate does not rub against the rolling roller when cleaning, and effectively solves the technical problem of damaging the rolling roller and reducing the rolling effect during cleaning in the prior art;

[0020] (4) The present invention is easy to operate and adopts mechanical adjustment throughout the process, which reduces the workload of operators, efficiently and automatically completes the crushing of molding sand, improves work efficiency, and reduces the workload of operators;

[0021] (5) The present invention is provided with a dispersing mechanism and a screening mechanism. The dispersing mechanism can further crush the mold sand after rolling to separate foreign matter from the mold sand, while the screening mechanism can screen the mold sand and large particles of foreign matter, thereby achieving the technical effect of improving the purity of the mold sand and effectively solving the technical problem of foreign matter mixed in the crushed mold sand in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a right view of a sand rolling device for metal casting proposed by the present invention;

[0023] Figure 2 A top view of a sand rolling device for metal casting proposed by the present invention;

[0024] Figure 3 A front view of a sand rolling device for metal casting proposed by the present invention;

[0025] Figure 4 for Figure 3 Sectional view of the middle AA plane;

[0026] Figure 5 A cross-sectional view of a sand rolling device for metal casting proposed by the present invention;

[0027] Figure 6 A cutaway perspective view of a sand rolling device for metal casting proposed by the present invention;

[0028] Figure 7 for Figure 6 Enlarged view of middle part B;

[0029] Figure 8 for Figure 6 Enlarged view of part C in the middle.

[0030] Among them, 1. main frame, 2. unloading mechanism, 3. constant pressure mechanism, 4. recovery mechanism, 410, scattering mechanism, 420, screening mechanism, 310, rolling mechanism, 320, lateral balancing mechanism, 330, cleaning mechanism, 201, feeding bin, 202, first servo motor, 203, first gear, 204, second gear, 205, forward and reverse screw rod, 206, feeding port, 321, sliding groove, 322, sliding frame, 323, second servo motor, 324, first threaded rod, 325, buffer groove, 326, buffer rod, 327, buffer spring, 3 11. Rolling roller, 312. Third servo motor, 313. Third gear, 314. Fourth gear, 315. Baffle, 331. Cleaning plate, 332. Limiting wheel, 333. Limiting spring, 334. Limiting rod, 335. Limiting joint, 411. Fourth servo motor, 412. Breaking shaft, 413. First pulley, 414. Second pulley, 415. Breaking knife, 421. Screening slot, 422. Fifth servo motor, 423. Fifth gear, 424. Sixth gear, 425. Transmission rod, 426. Screen, 101. Electrical control panel.

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the present scheme provides a sand rolling device for metal casting, including a main frame 1, a feeding mechanism 2, a constant pressure mechanism 3 and a recovery mechanism 4, the feeding mechanism 2 is arranged at the top of the main frame 1, the constant pressure mechanism 3 is arranged at the inner side wall of the main frame 1, the recovery mechanism 4 is arranged at the inner side wall of the main frame 1, the recovery mechanism 4 includes a breaking up mechanism 410 and a screening mechanism 420, the breaking up mechanism 410 is arranged at the inner side wall, the screening mechanism 420 is arranged at the inner side wall of the main frame 1, the constant pressure mechanism 3 includes a rolling mechanism 310, a lateral balancing mechanism 320 and a cleaning mechanism 330, the lateral balancing mechanism 320 is arranged at the inner side wall of the main frame 1, the rolling mechanism 310 is arranged on the side wall of the lateral balancing mechanism 320, and the cleaning mechanism 330 is arranged at the bottom of the lateral balancing mechanism 320.

[0034] Among them, the unloading mechanism 2 includes a feed bin 201, a first servo motor 202, a first gear 203, a second gear 204, a forward and reverse screw rod 205 and a feed port 206. The feed bin 201 is fixed at the top of the main frame 1, and the feed port 206 is opened at the bottom of the feed bin 201. The first servo motor 202 is fixed on the outer side wall of the feed bin 201, and the forward and reverse screw rod 205 is rotatably arranged on the inner side wall of the feed bin 201. The first gear 203 is coaxially fixed at the output end of the first servo motor 202, and the second gear 204 is coaxially fixed on the side wall of the forward and reverse screw rod 205.

[0035] Among them, the lateral balancing mechanism 320 includes a sliding groove 321, a sliding frame 322, a second servo motor 323, a first threaded rod 324, a buffer groove 325, a buffer rod 326 and a buffer spring 327. The sliding grooves 321 are opened in pairs on the inner wall of the main frame 1, the sliding frame 322 is slidably set on the inner wall of the sliding groove 321, the second servo motor 323 is fixed in pairs on the inner wall of the main frame 1, the first threaded rod 324 is coaxially fixed on the output end of the second servo motor 323, the buffer grooves 325 are opened in pairs on the side walls at both ends of the sliding frame 322, the two ends of the buffer rod 326 are slidably set on the inner wall of the buffer groove 325, one end of the buffer spring 327 is fixed on the inner side wall of the buffer groove 325, the other end of the buffer spring 327 is fixed on the side wall of the buffer rod 326, and the side wall of the buffer rod 326 is sleeved on the outer wall of the first threaded rod 324.

[0036] Among them, the rolling mechanism 310 includes a rolling roller 311, a third servo motor 312, a third gear 313, a fourth gear 314 and a baffle 315. The rolling rollers 311 are rotatably arranged in pairs on the side walls at both ends of the sliding frame 322, one end of the rolling rollers 311 passes through the side wall of the sliding frame 322, the third servo motor 312 is fixed in pairs on the side wall of the sliding frame 322, the third gear 313 is coaxially fixed on the output end of the third servo motor 312, the fourth gear 314 is coaxially fixed on the side wall of one end of the rolling roller 311, and the baffle 315 is fixed on the side wall of the sliding frame 322.

[0037] Among them, the cleaning mechanism 330 includes a cleaning plate 331, a limiting wheel 332, a limiting spring 333, a limiting rod 334 and a limiting joint 335. The cleaning plate 331 is rotatably arranged on the side wall of the sliding frame 322, the limiting wheels 332 are rotatably arranged in pairs on the top walls at both ends of the cleaning plate 331, the limiting joints 335 are rotatably arranged in pairs on the side walls at both ends of the sliding frame 322, one end of the limiting rod 334 is slidably arranged on the inner wall of the limiting joint 335, and the other end of the limiting rod 334 is rotatably arranged on the side wall of the cleaning plate 331, the limiting spring 333 is sleeved on the outer wall of the limiting rod 334, one end of the limiting spring 333 is fixedly arranged on the bottom wall of the limiting joint 335, and the other end of the limiting spring 333 is fixedly arranged on the top of the limiting rod 334.

[0038] Among them, the scattering mechanism 410 includes a fourth servo motor 411, a scattering shaft 412, a first pulley 413, a second pulley 414 and a scattering knife 415. The fourth servo motor 411 is fixedly arranged on the side wall of the main frame 1, and the scattering shaft 412 is rotatably arranged in pairs on the inner side wall of the main frame 1. One end of the scattering shaft 412 passes through the side wall of the main frame 1. The first pulley 413 is coaxially fixed on the output end of the fourth servo motor 411, and the second pulley 414 is coaxially fixed on the side wall of the scattering shaft 412. The scattering knife 415 is fixedly arranged in an array on the outer circumferential side wall of the scattering shaft 412. The first pulley 413 and the second pulley 414 are driven by a belt.

[0039] Among them, the screening mechanism 420 includes a screening slot 421, a fifth servo motor 422, a fifth gear 423, a sixth gear 424, a transmission rod 425 and a screen 426. The screening slot 421 is opened on the inner side wall of the main frame 1, the fifth servo motor 422 is fixed on the side wall of the main frame 1, the fifth gear 423 is coaxially fixed on the output end of the fifth servo motor 422, the sixth gear 424 is rotatably set on the side wall of the main frame 1, the screen 426 is slidably set on the inner wall of the screening slot 421, one end of the transmission rod 425 is rotatably set on the side wall of the screen 426, and the other end of the transmission rod 425 is rotatably set on the side wall of the fifth gear 423.

[0040] An electrical control panel 101 is fixedly disposed on the side wall of the main frame 1 , and the electrical control panel 101 is electrically connected to the first servo motor 202 , the second servo motor 323 , the third servo motor 312 , the fourth servo motor 411 and the fifth servo motor 422 through wires.

[0041] The first gear 203 is meshed with the second gear 204 , the buffer rod 326 is threadedly connected with the first threaded rod 324 , the third gear 313 is meshed with one of the fourth gears 314 , and the fifth gear 423 is meshed with the sixth gear 424 .

[0042] The top end surface of the cleaning plate 331 is in a concave arc shape, the radius of the top end surface of the cleaning plate 331 is the same as the radius of the circumference of the rolling roller 311, and the two ends of the forward and reverse spiral rods 205 rotate in opposite directions.

[0043] When in use, first put the molding sand into the feeding bin 201, then the user can control the first servo motor 202 to work by controlling the electrical control panel 101, and the forward and reverse screw rods 205 can be rotated through the first gear 203 and the second gear 204. Since the two ends of the forward and reverse screw rods 205 rotate in different directions, the molding sand in the feeding bin 201 can enter the feeding port 206 from both ends, and then enter the main frame 1. The output power of the first servo motor 202 can be controlled to control the amount of material discharged;

[0044] Then the user can control the second servo motor 323 and the third servo motor 312 to work through the electrical control panel 101. The buffer rod 326 can drive the sliding frame 322 to slide on the inner wall of the sliding groove 321 through the transmission of the first threaded rod 324, so as to adjust the distance between the two rolling rollers 311 and further adjust the rolling force. The third servo motor 312 works and drives the third gear 313 and the fourth gear 314 to rotate the rolling roller 311, so as to roll the molding sand. During the rolling process, the buffer spring 327 can make the sliding frame 322 buffer the displacement in the direction of the sliding groove 321.

[0045] During the rotation of the rolling roller 311, the limiting rod 334 can slide upward on the inner wall of the limiting joint 335 due to the tension of the limiting spring 333, so that the limiting wheel 332 can rotate close to the two ends of the rolling roller 311, and the cleaning plate 331 will remove the molding sand adhered to the surface of the rolling roller 311. In this process, the limiting spring 333 can play a buffering role;

[0046] Then the user can control the fourth servo motor 411 and the fifth servo motor 422 to rotate through the electrical control panel 101, and the first pulley 413 and the second pulley 414 can be used to drive the scattering shaft 412 to rotate, so that the scattering knife 415 can scatter the compacted molding sand, and then the molding sand falls into the screen 426. At this time, the fifth servo motor 422 rotates, and the sixth gear 424 can be rotated through the fifth gear 423. The screen 426 can be reciprocated on the inner wall of the screening slot 421 through the transmission rod 425, thereby achieving a screening effect. Since the screen 426 has a certain inclination angle with the horizontal plane, the screened foreign matter will be drawn out along the screen 426, and the screened fine sand will fall into the bottom of the main frame 1.

[0047] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0048] The present invention and its embodiments are described above, which is not restrictive. What is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and do not deviate from the purpose of the invention, they can creatively design structural methods and embodiments similar to the technical scheme, which should all fall within the scope of protection of the present invention.

Claims

1. A sand rolling device for metal casting, characterized in that: The invention comprises a main frame (1), a feeding mechanism (2), a constant pressure mechanism (3) and a recovery mechanism (4), wherein the feeding mechanism (2) is arranged at the top of the main frame (1), the constant pressure mechanism (3) is arranged at the inner side wall of the main frame (1), the recovery mechanism (4) is arranged at the inner side wall of the main frame (1), the recovery mechanism (4) comprises a scattering mechanism (410) and a screening mechanism (420), the scattering mechanism (410) is arranged at the inner side wall, the screening mechanism (420) is arranged at the inner side wall of the main frame (1), the constant pressure mechanism (3) comprises a rolling mechanism (310), a lateral balancing mechanism (320) and a cleaning mechanism (330), the lateral balancing mechanism (320) is arranged at the inner side wall of the main frame (1), the rolling mechanism (310) is arranged at the side wall of the lateral balancing mechanism (320), and the cleaning mechanism (330) is arranged at the bottom end of the lateral balancing mechanism (320); The unloading mechanism (2) comprises a feeding bin (201), a first servo motor (202), a first gear (203), a second gear (204), a forward and reverse screw rod (205) and a feeding port (206); the feeding bin (201) is fixedly arranged at the top of the main frame (1); the feeding port (206) is opened at the bottom of the feeding bin (201); the first servo motor (202) is fixedly arranged at the outer side wall of the feeding bin (201); the forward and reverse screw rod (205) is rotatably arranged at the inner side wall of the feeding bin (201); the first gear (203) is coaxially fixedly arranged at the output end of the first servo motor (202); and the second gear (204) is coaxially fixedly arranged at the side wall of the forward and reverse screw rod (205); The lateral balancing mechanism (320) comprises a sliding groove (321), a sliding frame (322), a second servo motor (323), a first threaded rod (324), a buffer groove (325), a buffer rod (326) and a buffer spring (327), wherein the sliding grooves (321) are formed in pairs on the inner wall of the main frame (1), the sliding frame (322) is slidably arranged on the inner wall of the sliding grooves (321), the second servo motor (323) is formed in pairs on the inner wall of the main frame (1), and the first threaded rod (324) is fixedly arranged on the inner wall of the main frame (1). 24) is coaxially fixed on the output end of the second servo motor (323), the buffer grooves (325) are opened in pairs on the side walls at both ends of the interior of the sliding frame (322), the two ends of the buffer rod (326) are slidably arranged on the inner wall of the buffer groove (325), one end of the buffer spring (327) is fixed on the inner side wall of the buffer groove (325), and the other end of the buffer spring (327) is fixed on the side wall of the buffer rod (326), and the side wall of the buffer rod (326) is sleeved on the outer wall of the first threaded rod (324); The rolling mechanism (310) comprises rolling rollers (311), a third servo motor (312), a third gear (313), a fourth gear (314) and a baffle (315); the rolling rollers (311) are rotatably arranged in pairs on the side walls at both ends of the sliding frame (322); one end of the rolling rollers (311) penetrates the side wall of the sliding frame (322); the third servo motor (312) is fixedly arranged in pairs on the side wall of the sliding frame (322); the third gear (313) is coaxially fixedly arranged on the output end of the third servo motor (312); the fourth gear (314) is coaxially fixedly arranged on the side wall of one end of the rolling rollers (311); and the baffle (315) is fixedly arranged on the side wall of the sliding frame (322); The cleaning mechanism (330) comprises a cleaning plate (331), a limiting wheel (332), a limiting spring (333), a limiting rod (334) and a limiting joint (335); the cleaning plate (331) is rotatably arranged on the side wall of the sliding frame (322); the limiting wheels (332) are rotatably arranged on the top walls at both ends of the cleaning plate (331) in pairs; the limiting joints (335) are rotatably arranged on the side walls at both ends of the sliding frame (322) in pairs; one end of the limiting rod (334) is slidably arranged on the inner wall of the limiting joint (335); the other end of the limiting rod (334) is rotatably arranged on the side wall of the cleaning plate (331); the limiting spring (333) is sleeved on the outer wall of the limiting rod (334); one end of the limiting spring (333) is fixedly arranged on the bottom wall of the limiting joint (335); and the other end of the limiting spring (333) is fixedly arranged on the top end of the limiting rod (334); The scattering mechanism (410) comprises a fourth servo motor (411), a scattering shaft (412), a first belt pulley (413), a second belt pulley (414) and a scattering knife (415); the fourth servo motor (411) is fixedly arranged on the side wall of the main frame (1); the scattering shaft (412) is rotatably arranged in pairs on the inner side wall of the main frame (1); one end of the scattering shaft (412) passes through the side wall of the main frame (1); the first belt pulley (413) is coaxially fixedly arranged on the output end of the fourth servo motor (411); the second belt pulley (414) is coaxially fixedly arranged on the side wall of the scattering shaft (412); the scattering knife (415) is fixedly arranged in an array on the outer circumferential side wall of the scattering shaft (412); and the first belt pulley (413) and the second belt pulley (414) are driven by a belt; The screening mechanism (420) comprises a screening slot (421), a fifth servo motor (422), a fifth gear (423), a sixth gear (424), a transmission rod (425) and a screen (426); the screening slot (421) is provided on an inner side wall of a main frame (1); the fifth servo motor (422) is fixedly arranged on the side wall of the main frame (1); the fifth gear (423) is coaxially fixedly arranged on an output end of the fifth servo motor (422); the sixth gear (424) is rotatably arranged on the side wall of the main frame (1); the screen (426) is slidably arranged on an inner wall of the screening slot (421); one end of the transmission rod (425) is rotatably arranged on a side wall of the screen (426); and the other end of the transmission rod (425) is rotatably arranged on a side wall of the fifth gear (423).

2. A sand rolling device for metal casting according to claim 1, characterized in that: An electrical control panel (101) is fixedly provided on a side wall of the main frame (1); the electrical control panel (101) is electrically connected to a first servo motor (202), a second servo motor (323), a third servo motor (312), a fourth servo motor (411), and a fifth servo motor (422) via wires.

3. A sand rolling device for metal casting according to claim 2, characterized in that: The first gear (203) is meshed with the second gear (204), the buffer rod (326) is threadedly connected to the first threaded rod (324), the third gear (313) is meshed with the fourth gear (314), and the fifth gear (423) is meshed with the sixth gear (424).

4. A sand rolling device for metal casting according to claim 3, characterized in that: The top end surface of the cleaning plate (331) is in a concave arc shape, the radius of the top end surface of the cleaning plate (331) is the same as the radius of the circumference of the rolling roller (311), and the two ends of the forward and reverse spiral rods (205) rotate in opposite directions.

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