Molding sand cleaning device for nodular cast iron well lid casting

Abstract

The invention relates to the technical field of well lid casting, discloses a molding sand cleaning device for casting of a nodular cast iron well lid, and solves the problem that a cleaning device can only filter and recycle molding sand and cannot clean and recycle metal impurities. An elastic filtering mechanism is arranged on the inner side of the recycling box and comprises a first fixing plate connected with the recycling box, a spring is arranged at the lower end of the first fixing plate, a frame is arranged at the lower end of the spring, first tooth blocks are arranged on the two sides of the frame, a first filter screen is arranged on the inner side of the frame, and an embedding plate is arranged on the outer surface of the frame. The driving mechanism makes contact with the first tooth block to push the first tooth block to move downwards so as to stretch the spring till the first tooth block stops making contact, the spring resets rapidly, and the first filter screen makes metal impurities fly out upwards due to elasticity and collide with the inner wall of the recycling box to be separated from molding sand.

Description

Technical Field

[0001] The invention relates to the technical field of manhole cover casting, in particular to a molding sand cleaning device for ductile iron manhole cover casting. Background Art

[0002] There will be many underground pipelines in urban construction. These pipelines must have an exit leading to the ground at intervals. In order to protect the exit, manhole covers will be installed at the exit to ensure normal driving on the road. During the casting process of the manhole cover, molten metal will be poured into the concave sand box to ensure the one-piece molding effect of the manhole cover. The sand inside the sand box can be used many times, and certain impurities may remain inside the sand, which can be cleaned and recycled later.

[0003] The existing Chinese patent with publication number CN220311668U discloses a sand processing device for casting ductile iron manhole covers, including a fuselage, a support plate fixedly connected to the top of the fuselage, a hopper fixedly connected to the side wall of the support plate, a fixed plate fixedly connected to the left inner wall of the fuselage, a motor fixedly connected to the top of the fixed plate, an output shaft of the motor extending to the bottom of the fixed plate and fixedly connected to a cam, two strip grooves are provided on the inner wall of the fuselage located on the right side of the fixed plate, connecting rods are slidably provided on the inner walls of the two strip grooves, and a mobile frame is fixedly sleeved on the rod walls of the two connecting rods at the same time, and the mobile frame is located below the hopper. The present invention can timely process the sand after casting, prevent the sand from agglomerating or being mixed with impurities, and ensure the reuse of the subsequent sand.

[0004] However, the device can only filter, clean and recycle the molding sand, but cannot clean and recycle the metal impurities, which greatly increases its cost and reduces the practicality of the device.

[0005] Therefore, a molding sand cleaning device for casting a ductile iron manhole cover is needed. Summary of the invention

[0006] In order to solve all or part of the above problems, the purpose of the present invention is to provide a molding sand cleaning device for ductile iron manhole cover casting, so as to solve the problem that the device proposed in the above-mentioned comparative document technology can only filter and clean the molding sand and recycle it, but cannot clean and recycle metal impurities, thereby greatly increasing its cost and reducing the practicability of the device.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a molding sand cleaning device for casting ductile iron manhole covers, comprising a cleaning box, a scattering assembly is arranged at the upper end of the cleaning box, a shaking screening assembly is arranged inside the cleaning box, a collecting box 1 is arranged inside the cleaning box, a material guide is arranged inside the cleaning box, a raw material cleaning and recycling assembly is arranged inside the cleaning box, a driving mechanism is arranged inside the cleaning box, a collecting box 2 is arranged at one end of the raw material cleaning and recycling assembly, the raw material cleaning and recycling assembly comprises a recycling box fixedly connected to the cleaning box, an elastic filtering mechanism is fixedly arranged inside the recycling box, and the elastic filtering mechanism comprises a recycling box fixedly connected to the recycling box The fixing plate 1 is connected to the frame, and a spring is fixedly arranged at the lower end of the fixing plate 1, and a frame is fixedly arranged at the lower end of the spring, tooth blocks 1 are fixedly arranged on both sides of the frame, a filter screen 1 is fixedly arranged on the inner side of the frame, and a fitting plate is fixedly arranged on the outer surface of the frame. The driving mechanism contacts the tooth block 1 and pushes it to move downward, so that it drives the frame to stretch the spring until the driving mechanism stops contacting the tooth block 1. The spring quickly resets and pulls the frame to move the filter screen 1 upward until the spring is compressed to the bottom. The filter screen 1 has its own elasticity so that metal impurities fly upward and collide with the inner wall of the recovery box to make the molding sand fall, thereby achieving its separation effect, facilitating the subsequent recycling of metal impurities, and reducing costs.

[0008] Furthermore, a groove is provided on the outer surface of the recycling box, a hydraulic plate is fixedly arranged on the upper end of the recycling box, a push plate is movably arranged on the inner side of the recycling box, a hydraulic rod is fixedly arranged on one end of the push plate, the groove and the engaging plate are movably connected to improve the stability of the elastic filtering mechanism during operation, and the hydraulic plate pushes the push plate to move and pushes the separated materials into the second collection box, thereby completing the automatic collection of the materials.

[0009] Furthermore, the driving mechanism includes a fixing part 1 fixedly connected to the cleaning box, a motor 1 is fixedly provided on the upper end of the fixing part 1, a rotating shaft is fixedly provided on the output end of the motor 1, a gear block 2 is fixedly provided on the outer side of the rotating shaft, the motor 1 drives the rotating shaft and drives the gear block 2 to rotate, and the gear block 2 contacts the gear block 1 to realize the stretching of the spring.

[0010] Furthermore, the dispersing assembly includes a dispersing mechanism fixedly connected to the cleaning box, an auxiliary dispersing mechanism is fixedly arranged at the lower end of the dispersing mechanism, the dispersing mechanism includes a discharge box fixedly connected to the cleaning box, a fixing part 2 is fixedly arranged on one side of the discharge box, a motor 2 is fixedly arranged on the upper end of the fixing part 2, a rotating rod is fixedly arranged at the output end of the motor 2, a plurality of fixed plates 2 are fixedly arranged on the outer side of the rotating rod, the motor 2 drives the rotating rod to rotate and drives the fixed plate 2 to rotate, so as to break up large pieces of molding sand and facilitate subsequent operations.

[0011] Furthermore, the auxiliary breaking up mechanism includes a fixed block fixedly connected to the discharge box, a fixed rod 1 is fixedly arranged on the inner side of the fixed block, a movable plate is movably arranged on the outer side of the fixed rod 1, a fixed rod 2 is fixedly arranged on the inner side of the movable plate, a plurality of rectangular plates are fixedly arranged on the outer side of the fixed rod 2, a through hole is opened on the surface of the rectangular plate, and the rectangular plate is located on the inner side of the shaking and screening assembly, so that when the falling molding sand is shaken and screened on the inner side of the shaking and screening assembly, the molding sand collides with the rectangular plate and partially moves back and forth through the through hole, thereby further enhancing the screening and breaking up effect of the device; because the movable plate is movably connected to the fixed rod 1, the shaking and screening assembly is driven to tilt during the dumping process, and when the shaking and screening assembly completes the tilting and returns to the horizontal state, it also returns to the horizontal state due to gravity.

[0012] Furthermore, the shaking screening assembly includes an active mechanism fixedly connected to the cleaning box, a screening disc is fixedly provided at one end of the active mechanism, a driven mechanism fixedly connected to the inner wall of the cleaning box is fixedly provided at one end of the screening disc, the active mechanism includes a key fixedly connected to the cleaning box, a motor three is fixedly provided at the upper end of the key, a shaft penetrating the cleaning box is fixedly provided at the output end of the motor three, a rotating disc one is fixedly provided at one end of the shaft, a cylinder one is fixedly provided at one end of the rotating disc one, and the cylinder one is fixedly connected to the screening disc. The screening disc is directly acted on by the cylinder one, and the cooperation of the driven mechanism drives the screening disc to shake back and forth to filter and separate the molding sand on the surface, and the separation effect is significant. The motor three drives the shaft and drives the rotating disc one to rotate at a certain angle, and then the driven mechanism is used to tilt the screening disc to a certain extent, so that the metal impurities remaining after filtering are dumped into the material guide and transported to the next process.

[0013] Furthermore, the driven mechanism includes a fixed plate fixedly connected to the inner wall of the cleaning box, a rotating plate 2 is movably provided at one end of the fixed plate, a cylinder 2 is fixedly provided at one end of the rotating plate 2, and the cylinder 2 is fixedly connected to the screening plate. The cylinder 2 cooperates with the cylinder 1 to stably shake the screening plate to reduce the flying of the molding sand during the shaking process. The setting of the rotating plate 2 cooperates with the active mechanism to complete the dumping of metal impurities.

[0014] Furthermore, the screening plate includes a filter screen 2 fixedly connected to cylinder 1 and cylinder 2, a baffle is fixedly provided on the upper end of the filter screen 2, and a conical mouth is fixedly provided on one side of the baffle. The setting of the filter screen 2 filters and separates the molding sand and the metal impurities therein, so that the molding sand falls and gathers in the collection box 1, thereby completing the recovery of the molding sand. The setting of the baffle further reduces the flying of materials during the shaking process, and the shape design of the conical mouth facilitates the falling of metal impurities when it is poured.

[0015] Furthermore, slide rails are fixedly provided on both sides of the collection box, and the slide rails are matched with the cleaning box. A pulling handle is fixedly provided at one end of the collection box, and the pulling handle can be used to facilitate pulling and operating the collection box. Because the slide rails are matched with the cleaning box, the pulling and pulling process is more labor-saving and smooth.

[0016] Furthermore, a pull-out handle 2 is fixedly provided at one end of the collecting box 2, a partition 1 is fixedly provided on the inner side of the collecting box 2, and a partition 2 is movably provided on the inner side of the collecting box 2. The function of the pull-out handle 2 is the same as that of the pull-out handle 1. The setting of the partition 1 facilitates the separate collection of the separated molding sand and metal impurities, which is convenient for subsequent recycling. The raw material cleaning and recovery component places the partition 2 when working, which effectively prevents the metal impurities from entering the collecting box 2 in advance and cannot be further filtered and separated. After the filtering and separation is completed, the partition 2 is opened to facilitate the push plate to push the material into the collecting box 2.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a molding sand cleaning device for casting ductile iron manhole covers. A driving mechanism contacts a tooth block and pushes it downward, so that it drives a frame to stretch a spring until the driving mechanism stops contacting the tooth block. The spring quickly resets and pulls the frame to move the filter screen upward until the spring is compressed to the bottom. The filter screen has its own elasticity so that metal impurities fly upward and collide with the inner wall of a recovery box to cause the molding sand to fall, thereby achieving a separation effect, facilitating the subsequent recycling of metal impurities, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the disintegration assembly of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the shaking screening assembly of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a collection box of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the raw material cleaning and recycling component of the present invention;

[0024] Figure 6 It is a schematic diagram of the recycling box structure of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the elastic filtering mechanism of the present invention;

[0026] Figure 8 It is a schematic diagram of the driving mechanism structure of the present invention;

[0027] Fig. 9 It is a schematic structural diagram of the second collection box of the present invention.

[0028] In the figure: 1. cleaning box; 2. scattering assembly; 21. scattering mechanism; 211. unloading box; 212. fixing part 2; 213. motor 2; 214. rotating rod; 215. fixing plate; 22. auxiliary scattering mechanism; 221. fixing block; 222. fixing rod 1; 223. movable plate; 224. fixing rod 2; 225. rectangular plate; 226. through hole; 3. shaking screening assembly; 31. active mechanism; 311. key; 312. motor 3; 313. shaft; 314. rotating disk 1; 315. cylinder 1; 32. screening disk; 321. filter screen 2; 322. baffle; 323. conical mouth; 33. driven mechanism; 331. Fixed plate; 332, rotating plate two; 333, cylinder two; 4, collecting box one; 41, slide rail; 42, pull-out handle one; 5, material guide; 6, raw material cleaning and recycling assembly; 61, recycling box; 611, groove; 612, hydraulic plate; 613, push plate; 614, hydraulic rod; 62, elastic filtering mechanism; 621, fixed plate one; 622, spring; 623, tooth block one; 624, frame; 625, filter screen one; 626, interlocking plate; 7, driving mechanism; 71, fixed part one; 72, motor one; 73, rotating shaft; 74, tooth block two; 8, collecting box two; 81, pull-out handle two; 82, partition one; 83, partition two. DETAILED DESCRIPTION

[0029] 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.

[0030] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0031] Combination Figure 1 , Figure 5 , Figure 7A sand cleaning device for casting a ductile iron manhole cover comprises a cleaning box 1, a scattering assembly 2 is arranged at the upper end of the cleaning box 1, a shaking screening assembly 3 is arranged inside the cleaning box 1, a collecting box 4 is arranged inside the cleaning box 1, a material guide 5 is arranged inside the cleaning box 1, a raw material cleaning and recycling assembly 6 is arranged inside the cleaning box 1, a driving mechanism 7 is arranged inside the cleaning box 1, a collecting box 8 is arranged at one end of the raw material cleaning and recycling assembly 6, the raw material cleaning and recycling assembly 6 comprises a recycling box 61 fixedly connected to the cleaning box 1, an elastic filtering mechanism 62 is fixedly arranged on the inner side of the recycling box 61, the elastic filtering mechanism 62 comprises a fixing plate 621 fixedly connected to the recycling box 61, and a spring 6 is fixedly arranged at the lower end of the fixing plate 621 22. A frame 624 is fixedly provided at the lower end of the spring 622, tooth blocks 623 are fixedly provided on both sides of the frame 624, a filter screen 625 is fixedly provided on the inner side of the frame 624, and a fitting plate 626 is fixedly provided on the outer surface of the frame 624. The tooth block 623 is contacted and pushed downward by the driving mechanism 7, so that the frame 624 is driven to stretch the spring 622 until the driving mechanism 7 stops contacting the tooth block 623. The spring 622 quickly resets and pulls the frame 624 to move the filter screen 625 upward until the spring 622 is compressed to the bottom. The filter screen 625 has its own elasticity so that the metal impurities fly upward and collide with the inner wall of the recovery box 61 to make the molding sand fall, thereby achieving its separation effect, facilitating the subsequent recycling of metal impurities, and reducing costs.

[0032] Combination Figure 6 A groove 611 is provided on the outer surface of the recovery box 61, a hydraulic plate 612 is fixedly provided on the upper end of the recovery box 61, a push plate 613 is movably provided on the inner side of the recovery box 61, a hydraulic rod 614 is fixedly provided on one end of the push plate 613, the groove 611 is movably connected with the interlocking plate 626, so as to improve the stability of the elastic filtering mechanism 62 during operation, and the hydraulic plate 612 pushes the push plate 613 to move and push the separated materials into the collection box 8, thereby completing the automatic collection of the materials.

[0033] Combination Figure 8 The driving mechanism 7 includes a fixing member 71 fixedly connected to the cleaning box 1, a motor 72 is fixedly provided on the upper end of the fixing member 71, a rotating shaft 73 is fixedly provided on the output end of the motor 72, a gear block 2 74 is fixedly provided on the outer side of the rotating shaft 73, the motor 72 drives the rotating shaft 73 and drives the gear block 2 74 to rotate, and the gear block 2 74 contacts the gear block 1 623 to realize the stretching of the spring 622.

[0034] Combination Figure 2The scattering assembly 2 includes a scattering mechanism 21 fixedly connected to the cleaning box 1, an auxiliary scattering mechanism 22 is fixedly arranged at the lower end of the scattering mechanism 21, the scattering mechanism 21 includes a discharge box 211 fixedly connected to the cleaning box 1, a fixing part 212 is fixedly arranged on one side of the discharge box 211, a motor 213 is fixedly arranged on the upper end of the fixing part 212, a rotating rod 214 is fixedly arranged at the output end of the motor 213, and a plurality of fixed plates 215 are fixedly arranged on the outer side of the rotating rod 214, the motor 213 drives the rotating rod 214 to rotate and drives the fixed plate 215 to rotate, so as to break up large pieces of molding sand and facilitate subsequent operations.

[0035] Combination Figure 2 The auxiliary breaking up mechanism 22 comprises a fixed block 221 fixedly connected to the discharge box 211, a fixed rod 222 is fixedly arranged on the inner side of the fixed block 221, a movable plate 223 is movably arranged on the outer side of the fixed rod 222, a fixed rod 224 is fixedly arranged on the inner side of the movable plate 223, a plurality of rectangular plates 225 are fixedly arranged on the outer side of the fixed rod 224, a through hole 226 is opened on the surface of the rectangular plate 225, and the rectangular plate 225 is located on the inner side of the shaking and screening component 3, so that when the falling molding sand is shaken and screened on the inner side of the shaking and screening component 3, the molding sand collides with the rectangular plate 225 and partially moves back and forth through the through hole 226, further enhancing the screening and breaking up effect of the device, because the movable plate 223 is movably connected with the fixed rod 222, the shaking and screening component 3 is driven to tilt during the dumping process, and when the shaking and screening component 3 completes the tilting and restores to the level, it also restores to the level due to gravity.

[0036] Combination Figure 3 The shaking screening assembly 3 includes an active mechanism 31 fixedly connected to the cleaning box 1, a screening disc 32 is fixedly arranged at one end of the active mechanism 31, a driven mechanism 33 fixedly connected to the inner wall of the cleaning box 1 is fixedly arranged at one end of the screening disc 32, the active mechanism 31 includes a key 311 fixedly connected to the cleaning box 1, a motor 312 is fixedly arranged at the upper end of the key 311, a shaft 313 penetrating the cleaning box 1 is fixedly arranged at the output end of the motor 312, a rotating disc 314 is fixedly arranged at one end of the shaft 313, and a rotating disc 314 is fixed at one end. A cylinder 315 is fixedly provided, and the cylinder 315 is fixedly connected to the screening disc 32. The cylinder 315 directly acts on the screening disc 32, and the cooperation of the driven mechanism 33 drives the screening disc 32 to reciprocate and filter and separate the molding sand on the surface. The separation effect is remarkable. The motor 312 drives the shaft 313 and drives the rotating disc 314 to rotate at a certain angle, and then the driven mechanism 33 is used to tilt the screening disc 32 to a certain extent, so that the metal impurities remaining after filtering are poured into the guide member 5 and transported to the next process.

[0037] Combination Figure 3The driven mechanism 33 includes a fixed plate 331 fixedly connected to the inner wall of the cleaning box 1, a rotating plate 2 332 is movably provided at one end of the fixed plate 331, a cylinder 2 333 is fixedly provided at one end of the rotating plate 2 332, the cylinder 2 333 is fixedly connected to the screening plate 32, the cylinder 2 333 cooperates with the cylinder 1 315 to stably shake the screening plate 32 to reduce the flying of the molding sand during the shaking process, and the setting of the rotating plate 2 332 cooperates with the active mechanism 31 to complete the dumping of metal impurities.

[0038] Combination Figure 3 The screening plate 32 includes a filter screen 321 fixedly connected to the cylinder 1 315 and the cylinder 2 333. A baffle 322 is fixedly provided on the upper end of the filter screen 321, and a conical mouth 323 is fixedly provided on one side of the baffle 322. The setting of the filter screen 321 filters and separates the molding sand and the metal impurities therein, so that the molding sand falls and gathers in the collection box 1 4, thereby completing the recovery of the molding sand. The setting of the baffle 322 further reduces the flying of the material during the shaking process, and the shape design of the conical mouth 323 facilitates the falling of the metal impurities when it is poured.

[0039] Combination Figure 4 Slide rails 41 are fixedly provided on both sides of the collection box 4, and the slide rails 41 are matched with the cleaning box 1. A pulling handle 42 is fixedly provided at one end of the collection box 4. The pulling handle 42 facilitates the pulling and pulling of the collection box 4 as required. Because the slide rails 41 are matched with the cleaning box 1, the pulling and pulling process is more labor-saving and smooth.

[0040] Combination Fig. 9 A pull-out handle 81 is fixedly provided at one end of the collecting box 8, a partition 82 is fixedly provided on the inner side of the collecting box 8, and a partition 83 is movably provided on the inner side of the collecting box 8. The function of the pull-out handle 81 is the same as that of the pull-out handle 42. The setting of the partition 82 is convenient for collecting the separated molding sand and metal impurities separately, which is convenient for subsequent recycling. The raw material cleaning and recovery component 6 places the partition 83 when working, which effectively prevents the metal impurities from entering the collecting box 8 in advance and cannot be further filtered and separated. After the filtering and separation is completed, the partition 83 is opened to facilitate the push plate 613 to push the material into the collecting box 8.

[0041] It should be noted that, in the description of the present application, it should be understood that the terms "length", "thickness", "inside", "outside", "axial", "radial", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sand cleaning device for casting ductile iron manhole covers, comprising a cleaning box (1), a scattering assembly (2) is arranged at the upper end of the cleaning box (1), a shaking screening assembly (3) is arranged inside the cleaning box (1), a collecting box 1 (4) is arranged inside the cleaning box (1), a material guide (5) is arranged inside the cleaning box (1), a raw material cleaning recovery assembly (6) is arranged inside the cleaning box (1), a driving mechanism (7) is arranged inside the cleaning box (1), and a collecting box 2 (8) is arranged at one end of the raw material cleaning recovery assembly (6), characterized in that: The raw material cleaning and recycling assembly (6) comprises a recycling box (61) fixedly connected to the cleaning box (1); an elastic filtering mechanism (62) is fixedly arranged on the inner side of the recycling box (61); the elastic filtering mechanism (62) comprises a fixing plate (621) fixedly connected to the recycling box (61); a spring (622) is fixedly arranged at the lower end of the fixing plate (621); a frame (624) is fixedly arranged at the lower end of the spring (622); gear blocks (623) are fixedly arranged on both sides of the frame (624); a filter screen (625) is fixedly arranged on the inner side of the frame (624); and a fitting plate (626) is fixedly arranged on the outer surface of the frame (624).

2. A sand cleaning device for ductile iron manhole cover casting according to claim 1, characterized in that: The outer surface of the recovery box (61) is provided with a groove (611), the upper end of the recovery box (61) is fixedly provided with a hydraulic plate (612), the inner side of the recovery box (61) is movably provided with a push plate (613), and one end of the push plate (613) is fixedly provided with a hydraulic rod (614).

3. The device for cleaning the molding sand for casting a ductile iron manhole cover according to claim 1, characterized in that: The driving mechanism (7) comprises a fixing member (71) fixedly connected to the cleaning box (1); a motor (72) is fixedly arranged on the upper end of the fixing member (71); a rotating shaft (73) is fixedly arranged on the output end of the motor (72); and a gear block (74) is fixedly arranged on the outer side of the rotating shaft (73).

4. The device for cleaning the molding sand for casting a ductile iron manhole cover according to claim 1, characterized in that: The scattering assembly (2) comprises a scattering mechanism (21) fixedly connected to the cleaning box (1); an auxiliary scattering mechanism (22) is fixedly arranged at the lower end of the scattering mechanism (21); the scattering mechanism (21) comprises a material discharge box (211) fixedly connected to the cleaning box (1); a second fixing member (212) is fixedly arranged on one side of the material discharge box (211); a second motor (213) is fixedly arranged on the upper end of the second fixing member (212); a rotating rod (214) is fixedly arranged at the output end of the second motor (213); and a plurality of second fixing plates (215) are fixedly arranged on the outer side of the rotating rod (214).

5. The device for cleaning the molding sand for casting a ductile iron manhole cover according to claim 4, characterized in that: The auxiliary breaking mechanism (22) comprises a fixed block (221) fixedly connected to the material discharge box (211); a fixed rod 1 (222) is fixedly arranged on the inner side of the fixed block (221); a movable plate (223) is movably arranged on the outer side of the fixed rod 1 (222); a fixed rod 2 (224) is fixedly arranged on the inner side of the movable plate (223); a plurality of rectangular plates (225) are fixedly arranged on the outer side of the fixed rod 2 (224); and a through hole (226) is provided on the surface of the rectangular plate (225).

6. The device for cleaning the molding sand for casting a ductile iron manhole cover according to claim 1, characterized in that: The shaking screening assembly (3) comprises an active mechanism (31) fixedly connected to the cleaning box (1), a screening disc (32) being fixedly arranged at one end of the active mechanism (31), a driven mechanism (33) fixedly connected to the inner wall of the cleaning box (1) being fixedly arranged at one end of the screening disc (32), the active mechanism (31) comprising a key (311) fixedly connected to the cleaning box (1), a motor three (312) being fixedly arranged at the upper end of the key (311), a shaft (313) penetrating the cleaning box (1) being fixedly arranged at the output end of the motor three (312), a rotating disc one (314) being fixedly arranged at one end of the shaft (313), a cylinder one (315) being fixedly arranged at one end of the rotating disc one (314), and the cylinder one (315) being fixedly connected to the screening disc (32).

7. A sand cleaning device for casting ductile iron manhole covers according to claim 6, characterized in that: The driven mechanism (33) comprises a fixed disk (331) fixedly connected to the inner wall of the cleaning box (1); a rotating disk (332) is movably provided at one end of the fixed disk (331); a cylinder (333) is fixedly provided at one end of the rotating disk (332); and the cylinder (333) is fixedly connected to the screening disk (32).

8. The device for cleaning the molding sand for casting a ductile iron manhole cover according to claim 6, characterized in that: The screening plate (32) comprises a second filter screen (321) fixedly connected to the first cylinder (315) and the second cylinder (333), a baffle (322) is fixedly arranged on the upper end of the second filter screen (321), and a conical opening (323) is fixedly arranged on one side of the baffle (322).

9. The device for cleaning the molding sand for casting a ductile iron manhole cover according to claim 1, characterized in that: Slide rails (41) are fixedly provided on both sides of the collection box (4), the slide rails (41) are matched with the cleaning box (1), and a pull-out handle (42) is fixedly provided on one end of the collection box (4).

10. The device for cleaning molding sand for casting ductile iron manhole covers according to claim 1, characterized in that: A pull-out handle (81) is fixedly provided at one end of the second collection box (8), a partition (82) is fixedly provided on the inner side of the second collection box (8), and a partition (83) is movably provided on the inner side of the second collection box (8).

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