CN111283138B

CN111283138B - Foundry raw sand screening device

Info

Publication number: CN111283138B
Application number: CN201811613153.8A
Authority: CN
Inventors: 李秀英
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2021-01-15
Anticipated expiration: 2038-12-27
Also published as: CN111283138A

Abstract

The invention provides a casting raw sand screening device, which solves the technical problems of low screening efficiency, poor screening effect and the like in the prior screening technology. The casting raw sand screening device comprises a sand crushing device and a sand filtering device and is characterized in that the sand crushing device comprises a first vibrating disc, the first vibrating disc comprises a first disc body, a first spiral track is fixed on the inner wall of the first disc body, a plurality of conical protruding parts are uniformly distributed on the top surface of the first spiral track, sand rises along the first spiral track, and agglomerated sand is crushed by the protruding parts; the sand filtering device comprises a sand filtering box, a second sand collecting barrel is arranged in an inner cavity of the sand filtering box, a conical sand filtering net is arranged above the second sand collecting barrel, a sand collecting pipe is arranged at the top of the sand filtering box, a mixture of sand and water in the sand collecting pipe is sprayed to the sand filtering net through a spray head under the action of high-pressure water flow, and impurities in the sand are filtered in the rotating process of the sand filtering net. The invention has the advantages of high screening efficiency, good screening effect and the like.

Description

Foundry raw sand screening device

Technical Field

The invention belongs to the technical field of sand screening, and relates to a sand screening device, in particular to a casting raw sand screening device.

Background

The raw sand is the most basic material for molding (core) in casting production, and the most widely used is quartz sand which is commonly called silica sand. In sand casting, raw sand is an aggregate and a main component in a mixture, and casting sand used for the first time is called raw sand. In casting, there are certain performance index requirements for raw sand, for example: (1) permeability, dry sand must be sufficiently permeable to allow gases and liquid pyrolysis residues to escape from the casting cavity during casting. Too much mud and dust in the raw sand can reduce the air permeability of the sand. (2) Moisture content, moisture in sand is the source of many casting defects, and it is desirable to eliminate moisture from the raw sand and reduce the moisture content. (3) The purity, the inclusion of other large particle impurities in the raw sand, such as fine gravel, etc. which are entrained in the raw sand, can affect the strength of the mold and the surface quality of the casting. The sand used as the raw sand cannot be directly used as the casting raw sand after being collected, and needs to be subjected to a series of processing treatments such as screening, dust removal, drying and the like before being used as the casting raw sand.

Traditional screening method is generally that the manual work is screened raw sand with the sieve, and is inefficient, in order to solve this problem, has to carry out the screening through the machine device, and present common machine screening all is through the screen cloth that sets up, utilizes the vibration of screen cloth, screens the grit that falls on the screen cloth, and the problem of existence mainly has: 1. if the sand is agglomerated, the agglomerated sand cannot pass through the sieve holes without being broken; 2. if the sand is wet or has large-particle impurities, the sand is easy to adhere to the sieve holes, or the impurities block the sieve holes, so that the sieve holes are blocked, and the screening efficiency is reduced; 3. the screening can not go on in succession, stops the impurity of sieving out on the screen cloth, need overturn the screen cloth or empty, pours out the impurity on the screen cloth, then the screen cloth playback continues the screening, at the screen cloth upset in-process, can't filter the grit for the screening can not go on in succession, has reduced screening efficiency. Chinese patent (application No. CN201720813864.4) discloses a sand screening mechanism for screening sand falling on a screen by using vibration of the screen in the mechanism, which improves efficiency in place of manual screening, but has problems that the screen holes are easily clogged and screening cannot be continuously performed.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a casting raw sand screening device which can improve the screening effect and the screening efficiency of raw sand.

The purpose of the invention can be realized by the following technical scheme: a casting raw sand screening device comprises a sand crushing device and a sand filtering device and is characterized in that the sand crushing device comprises a first vibrating disk, the first vibrating disk comprises a first disk body with a top opening, a first material storage cavity is arranged in the first disk body, a first spiral track which spirally rises is fixed on the inner wall of the first disk body, a plurality of conical protruding parts are uniformly distributed on the top surface of the first spiral track, the bottom end of the first spiral track is connected with the bottom surface of the first material storage cavity, the top end of the first spiral track extends out of the top opening of the first tray body, a first material guide pipe is vertically fixed in the first material storage cavity, the bottom end of the first material guide pipe is fixed with the center of the bottom of the first material storage cavity, the top end of the first material guide pipe is connected with a first hopper, a first material guide opening communicated with the inner cavity of the first material guide pipe and the first material storage cavity is formed in the bottom end of the first material guide pipe, and a first sand collecting barrel is arranged below the top end of the first spiral track. The sand collected from natural world such as rivers and the like as raw sand is often agglomerated and agglomerated together due to the inclusion of substances such as soil and the like, and is crushed by using a sand crushing device, the collected sand is firstly poured into a first hopper, the sand falls to the bottom of a first disc body along a first material guide pipe, part of the sand overflows from a first material guide port, the overflowing sand rises along a first spiral track from the bottom end of the first spiral track under the vibration action of a first vibrating disc, the sand in the first material guide pipe continuously overflows from a first material guide port and enters the first spiral track, a plurality of conical protrusions are uniformly distributed on the top surface of the first spiral track, the agglomerated sand is crushed under the vibration action of the protrusions in the process of rising along the first spiral track, the crushed sand is crushed into a dispersed sand along the first spiral track, and rises on the track surface between the protrusions, then falls into the first sand collecting barrel from the top end of the first spiral track for collection.

The sand filtering device comprises a sand filtering box, the sand filtering box is provided with an inner cavity, the top of the sand filtering box is covered with a box cover, supporting legs are fixed at the bottom of the sand filtering box, drain holes are formed in the bottom of the sand filtering box, a water collecting barrel is arranged below the sand filtering box, a second sand collecting barrel is arranged in the center of the bottom of the inner cavity of the sand filtering box, draining holes are formed in the bottom of the second sand collecting barrel, a sand filtering mechanism is arranged above the second sand collecting barrel and comprises a conical sand filtering net, the sand filtering net comprises a conical top part and a conical tail part, the conical top part is vertically arranged upwards, the conical tail part is positioned above the second sand collecting barrel, the sand filtering net is connected with a driving mechanism capable of enabling the sand filtering net to rotate around the axial lead of the sand filtering net, and a side door is arranged on the side wall; the sand filtering device is characterized in that a sand collecting pipe is transversely arranged at the top of the sand filtering box, the sand collecting pipe is upwards connected with a sand guide pipe through a three-way joint, the top end of the sand guide pipe is connected with a sand hopper, one end of the sand collecting pipe is connected with a turbulence box, a turbulence cavity is arranged in the turbulence box, one side of the turbulence box is provided with a water inlet hole communicated with the turbulence cavity, the water inlet hole is connected with one end of the sand guide pipe, the other side of the turbulence box is provided with a water outlet hole communicated with the turbulence cavity, the water outlet hole is connected with a spray head through a connecting pipe, the connecting pipe penetrates into the sand filtering box and enables the spray head to face a conical sand filtering net, an impeller I and an impeller II are rotatably arranged in the turbulence box, the other end of the sand guide pipe is connected with a booster pump through the connecting; the top of the sand filtering net is provided with a shifting strip, the shifting strip is parallel to a bus of the conical sand filtering net, the bottom surface of the shifting strip is provided with bristles, the bristles are abutted to the net surface of the sand filtering net, and the shifting strip is fixed with the bottom of a box cover of the sand filtering box through a connecting rod. Pouring the sand collected by the first sand collecting barrel into a sand hopper, enabling the sand in the sand hopper to fall into a sand collecting pipe through a sand guide pipe, starting a tap water and a booster pump, boosting tap water through the booster pump, flushing the sand in the sand collecting pipe forwards, continuously replenishing the sand in the sand hopper into the sand collecting pipe through the sand guide pipe, enabling a mixture of water and the sand to enter a turbulence box from the sand collecting pipe, enabling an impeller I and an impeller II arranged in the turbulence box to rotate under the action of water flow impact, lifting the sand in the water, preventing the sand from depositing at the bottom, uniformly mixing the sand in the water, then spraying the sand through a nozzle through a connecting pipe, spraying a high-pressure mixed liquid of the water and the sand onto a conical sand screen through the nozzle, enabling the sand meeting the size of the original sand particles to penetrate through meshes of the sand screen along with the water sprayed under high pressure, then falling into a second sand collecting barrel, opening a side door, and taking out the second sand collecting barrel, impurities larger than the size of the raw sand particles, such as small stones and the like, are blocked by the meshes of the sand filtering net, slide down to the bottom of the inner cavity of the sand filtering box along the net surface of the sand filtering net, and can be cleaned out from a side door, so that the sand is screened out to meet the requirement of raw sand for casting, the size of the meshes of the sand filtering net is determined according to the size of the particles of the required raw sand, the sand filtering net rotates under the action of a first driving mechanism in the screening process, bristles on a shifting strip are abutted against the sand filtering net and move relatively, the cleaning action is carried out, the impurities are prevented from being clamped on the meshes of the sand filtering net, meanwhile, the sand which is not penetrated through the sand filtering net in time and is attached to the net surface is also cleaned, and when the sand is rotated to the position of the spray head again, the sand filtering net holes of the sand filtering net. The water flows out of the bottom in the sand filtering box through the draining hole at the bottom in the second sand collecting barrel and then flows into the water collecting barrel through the water discharging hole for collection.

The first driving mechanism comprises a first driving motor, a machine body of the first driving motor is fixed with the top of the sand filtering box through a support, a cross-shaped reinforcing rib is fixed at the tail of a cone of the sand filtering net, a driving shaft is fixed from the top of the cone of the sand filtering net to the center of the reinforcing rib, the bottom end of the driving shaft is fixed with the center of the reinforcing rib, the top end of the driving shaft penetrates out of the top of the cone of the sand filtering net, the top of the cone of the sand filtering net is fixed with the driving shaft, and the top end of the driving shaft extends out of the sand filtering box and.

The protruding parts are conical, the diameter of the bottom ends of the protruding parts is 2-5mm, the height of the protruding parts is 2-4mm, and the center distance between every two adjacent protruding parts is 5-8 mm.

First baffle plates are fixed on two sides of the first spiral track extending out of the top opening part of the first disk body.

The first hopper is fixed with the top opening of the first tray body through the supporting rod.

Compared with the prior art, the invention has the following advantages:

1. the sand crushing device provided by the invention is used for crushing sand, and the agglomerated sand is crushed through the conical protruding part on the top surface of the first spiral track, so that the sand crushing device has the advantage of good crushing effect, and the sand screening effect in the subsequent steps is improved.

2. In the sand crushing device, after the sand overflowing from the first material guide port enters the first spiral track, the sand in the first hopper continuously overflows and is supplemented to the first material guide port, and the sand crushing device has the advantage of sand discharging continuity.

3. The sand filtering device filters impurities in sand, the impurities are selected through the conical sand filtering mesh screen, the whole filtering process is continuously carried out, the defect that the traditional sand screening equipment cannot be continuously carried out is overcome, and the sand filtering device has the advantage of high screening efficiency.

Drawings

FIG. 1 is a schematic axial view of the sand crushing apparatus of the present invention.

Fig. 2 is a schematic sectional structure view of the sand crushing device of the present invention.

Fig. 3 is a schematic structural view of the sand filtering device of the present invention.

Fig. 4 is a schematic structural view of a sand screen in the sand filtering device of the present invention.

FIG. 5 is a schematic view of the dust removing apparatus of the present invention.

FIG. 6 is a schematic view showing the structure of the filter box and the dust collecting net plate in the dust removing device of the present invention.

Fig. 7 is an exploded view of the filter box and the dust collecting net plate in the dust removing device of the present invention.

Fig. 8 is a schematic view of the structure of the dust collecting net plate in the dust removing device of the present invention.

FIG. 9 is a schematic structural view of a sand baking device of the present invention

FIG. 10 is a schematic structural view of the sand trap of the present invention.

FIG. 11 is a schematic structural view of a sand baking device and a sand collecting device according to the present invention.

Fig. 12 is a schematic structural view of a sand-collecting frame in the sand-collecting device of the present invention.

Fig. 13 is a partial structural view of the sand trap of the present invention.

Fig. 14 is a schematic structural view of the projection on the track surface of the first spiral track according to the present invention.

In the figure, 1, a first tray body; 2. a first material storage cavity; 3. a first spiral track; 3a, a protrusion; 4. a first material guide pipe; 4a, a first material guide port; 5. a first hopper; 6. a first sand collection barrel; 7. a sand filtering box; 7a, a drain hole; 7b, a side door; 8. a water collection barrel; 9. a second sand collection barrel; 9a, draining holes; 10. a sand screen; 10a, a cone top; 10b, a cone tail part; 11. a sand collecting pipe; 12. a three-way joint; 13. a sand guide pipe; 14. a sand hopper; 15. a turbulence box; 16. an impeller I; 17. an impeller II; 18. a spray head; 19. a booster pump; 20. dialing a strip; 21. brushing; 22. a dust removal box; 23. a dust filter screen; 24. a first stirring wheel; 25. a second stirring wheel; 26. a first impeller shaft; 27. a second impeller shaft; 28. a first gear; 29. a second gear; 30. a flow deflector; 31. a cross bar; 32. a circulation pump; 33. a filter box; 33a, a socket; 34. a dust collecting screen plate; 35. a water discharge nozzle; 36. a sand discharge door; 37. a dust collecting plate; 37a, an annular groove; 38. a dust collecting net; 39. a dust collecting cloth; 40. locking the frame; 41. an annular seal ring; 42. a guide strip; 42a, a guide groove; 43. a first baffle plate; 44. a second baffle plate; 45. a card slot; 46. a conveyor belt; 47. an active roller; 48. a driven roller; 49. a water collection tank; 50. a first bracket; 51. a second bracket; 52. a magnetic bar; 53. blocking strips; 54. a sand guide plate; 55. a third sand collecting barrel; 56. a recycling bin; 57. a second tray body; 58. a second material storage cavity; 59. a second spiral track; 60. a material guide plate; 61. a second material guide pipe; 61a and a second material guide port; 62. a second hopper; 63. an air guide pipe; 63a, an upper air guide hole; 63b, a lower air guide hole; 64. a warm air blower; 65. a turntable; 65a, placing grooves; 66. a storage plate; 67. a controller; 68. a sand collecting frame; 69. a top ring; 70. a bottom ring; 71. a first vertical rod; 72. a second vertical rod; 73. a material guide hopper; 74. an electromagnetic valve; 75. a pulley; 76. a guide rail; 77. a supporting seat; 78. a stepping motor; 79. erecting a rod; 80. a transverse bar; 81. an infrared receiver; 82. an infrared emitter; 83. driving a motor I; 84. a cross-shaped reinforcing rib; 85. a drive shaft; 86. a second driving motor; 87. a hinged seat; 88. a third vertical rod; 89. reinforcing ribs; 90. a support; 91. a first baffle plate; 92. a first compression ring; 93. and a second compression ring.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the sand crushing device includes a first vibration disc, the first vibration disc includes a first disc body 1 with a top opening, a first material storage cavity 2 is arranged in the first disc body 1, a first spiral track 3 which spirally ascends is fixed on the inner wall of the first disc body 1, a plurality of protrusions 3a which are conical are uniformly distributed on the top surface of the first spiral track 3, as shown in fig. 14, the protrusions 3a are conical, the first spiral track 3 is made of a metal plate, the protrusions 3a are integrally formed by die stamping, in the embodiment, the diameter of the bottom end of the protrusion 3a which is conical is 3mm, the height of the protrusion 3a is 3mm, and the center distance between the adjacent protrusions 3a is 5 mm. The bottom of first spiral track 3 is connected with the bottom surface of first storage cavity 2, adopt tangent connection in this embodiment, the top of first spiral track 3 stretches out the top of first disk body 1, the both sides of first spiral track 3 that stretch out the top of first disk body 1 are fixed with first baffle 91, prevent that the grit from dropping from both sides, vertical being fixed with first passage 4 in first storage cavity 2, the bottom of first passage 4 is fixed with the bottom center of first storage cavity 2, the top of first passage 4 is connected with first hopper 5, first hopper 5 is fixed with the top of first disk body 1 through the bracing piece, first passage 4a of intercommunication first passage 4 inner chamber and first storage cavity 2 is seted up to the bottom of first passage 4, the top below of first spiral track 3 is provided with first sand collecting bucket 6.

As shown in fig. 3 and 4, the sand filtering device includes a sand filtering box 7, the sand filtering box 7 has an inner cavity, a box cover is covered on the top of the sand filtering box 7, supporting legs are fixed on the bottom of the sand filtering box 7, a drain hole 7a is opened on the bottom of the sand filtering box 7, a water collecting bucket 8 is arranged below the sand filtering box 7, a second sand collecting bucket 9 is arranged in the center of the bottom of the inner cavity of the sand filtering box 7, the second sand collecting bucket 9 is placed on a support 90, the support 90 is fixed with the bottom of the inner cavity of the sand filtering box 7, a drain hole 9a is opened on the bottom of the second sand collecting bucket 9, a sand filtering mechanism is arranged above the second sand collecting bucket 9, the sand filtering mechanism includes a conical sand filtering net 10, in this embodiment, the sand filtering net 10 is conical, the conical angle range is 80-120 degrees, in this embodiment 100 degrees, when sand can better penetrate through the sand filtering net 10, the impurities blocked and filtered by the sand screen 10 smoothly fall down along the conical surface of the sand screen 10. The sand filtering net 10 comprises a cone top part 10a and a cone tail part 10b, the cone top part 10a is arranged vertically upwards, the cone tail part 10b is positioned above the second sand collecting barrel 9, the sand filtering net 10 is connected with a driving mechanism capable of enabling the sand filtering net to rotate around the axial lead of the sand filtering net, the side wall of the sand filtering box 7 is provided with a side door 7b, the side door 7b is close to the bottom of an inner cavity of the sand filtering box 7, the bottom of the side door 7b is hinged with the side wall of the sand filtering box 7, and a handle is fixed at the upper part of the side door 7 b; the top of the sand filtering box 7 is transversely provided with a sand collecting pipe 11, the sand collecting pipe 11 is upwards connected with a sand guide pipe 13 through a three-way joint 12, the top end of the sand guide pipe 13 is connected with a sand hopper 14, one end of the sand collecting pipe 11 is connected with a turbulence box 15, the inside of the turbulence box 15 is provided with a turbulence cavity, one side of the turbulence box 15 is provided with a water inlet hole communicated with the turbulence cavity, the water inlet hole is connected with one end of the sand guide pipe 13, the other side of the turbulence box 15 is provided with a water outlet hole communicated with the turbulence cavity, the water outlet hole is connected with a nozzle 18 through a connecting pipe, the connecting pipe penetrates into the sand filtering box 7, the nozzle 18 faces towards a conical sand filtering net 10, and the turbulence box 15 is internally provided with a first impeller 16 and a second impeller 17 in a rotating mode, in the embodiment, the first impeller 16 and the second impeller 17 reversely rotate under the action of water flow. The other end of the sand guide pipe 13 is connected with a booster pump 19 through a connecting pipe, and the booster pump 19 is connected with a tap water tap through the connecting pipe; the upper portion of the sand filtering net 10 is provided with a shifting strip 20, the shifting strip 20 is parallel to a bus of the conical sand filtering net 10, the bottom surface of the shifting strip 20 is provided with bristles 21, the bristles 21 are abutted to the net surface of the sand filtering net 10, and the shifting strip 20 is fixed with the bottom of a box cover of the sand filtering box 7 through a connecting rod. As shown in fig. 5, 6, 7 and 8, the dust removing device in step c includes a dust removing box 22, a dust removing cavity is formed inside the dust removing box 22, an opening communicated with the dust removing cavity is formed at the top end of the dust removing box 22, supporting legs are formed at the bottom of the dust removing box 22, a dust filtering net 23 is horizontally arranged in the dust removing cavity, the dust filtering net 23 divides the dust removing cavity into an upper cavity and a lower cavity, a first stirring wheel 24 and a second stirring wheel 25 are rotatably arranged at the bottom of the lower cavity, the first stirring wheel 24 is rotatably arranged at the bottom of the dust removing box 22 through a first impeller shaft 26, the bottom end of the first impeller shaft 26 extends out of the dust removing box 22 and is connected with a second driving mechanism capable of rotating the first stirring wheel, the second stirring wheel 25 is rotatably arranged at the bottom of the dust removing box 22 through a second impeller shaft 27, a first gear 28 is sleeved and fixed on the first impeller shaft 26, a second gear 29 is sleeved and fixed on the second impeller shaft 27, the first gear 28 and the second gear 29 are mutually meshed, a plurality, in this embodiment, the number of the flow deflectors 30 is six, the flow deflectors 30 are wavy, a plurality of flow deflectors 30 are fixedly connected in series with a cross rod 31, and two ends of the cross rod 31 are respectively fixed with two side walls of the dust removal box 22; a water outlet nozzle communicated with the upper cavity is fixed on the outer wall of the box body of the upper cavity, the water outlet nozzle is connected with an input port of a circulating pump 32 through a connecting pipe, an output port of the circulating pump 32 is connected with a filter box 33 through a connecting pipe, the filter box 33 is of a closed structure, a filter cavity is arranged in the filter box 33, a rectangular socket 33a communicated with the filter cavity is formed in the top of the filter box 33, a dust collecting screen plate 34 is vertically arranged in the filter cavity, the dust collecting screen plate 34 is inserted into the filter box 33 through the socket 33a, the filter box 33 is connected with a water outlet nozzle 35 through a connecting pipe, and the water outlet nozzle 35 faces; the side wall of the lower cavity of the dust removing box 22 is provided with a sand discharging opening, the sand discharging opening is provided with a sand discharging door 36 for opening or closing the sand discharging opening, the edge of the bottom opening of the sand discharging opening is close to the bottom of the lower cavity, the bottom end of the sand discharging door 36 is hinged with the edge of the bottom opening of the sand discharging opening, and a handle is fixed on the outer wall of the sand discharging door 36. The working principle is as follows: pouring the sand collected by the second sand collecting barrel 9 in the step b into the dust removing box 22 from the sand discharging port, closing the sand discharging door 36, injecting clear water into the dust removing box 22 from the top port of the dust removing box 22 to enable the water level of the clear water to reach the upper cavity, enabling the first stirring wheel 24 and the second stirring wheel 25 to rotate in opposite directions, enabling the water in the lower cavity to flow to the upper cavity through the dust filtering net 23, enabling the sand in the lower cavity to be lifted upwards by the water flow to move to the dust filtering net 23 and to be blocked by the dust filtering net 23 when touching the dust filtering net 23, enabling dust and soil and the like mixed with the sand to pass through meshes of the dust filtering net 23 to reach the upper cavity, under the action of the circulation pump 32, the dust in the upper chamber is sucked into the filter box 33 along with the water flow, the dust in the filter chamber is filtered by the dust collecting net 38 plate 34, and the water in the filter box 33 passes through the dust collecting net 38 plate 34 and flows back to the dust removing box 22 from the water discharging nozzle 35 through the connecting pipe, so that the dust in the sand is removed. Through the arrangement of the first gear 28 and the second gear 29 which are meshed with each other on the first impeller shaft 26 and the second impeller shaft 27, the first stirring wheel 24 and the second stirring wheel 25 rotate in opposite directions, so that water in the lower cavity forms violent turbulence, the sand of water is dispersed, dust mixed in the sand is fully separated from the sand, and the dust removal effect is improved. The plurality of wave-shaped flow deflectors 30 arranged in the lower cavity enable a zigzag flow guide channel to be formed between the adjacent flow deflectors 30, when water flows through the flow guide channel, the flow guide channel plays a role in disturbing flow, sand is further fully dispersed, and the dust removal effect is improved.

The dust collecting net plate 34 comprises a rectangular dust collecting plate 37, the dust collecting plate 37 is provided with a square dust collecting opening penetrating through the bottom surface and the top surface of the dust collecting plate 37, the bottom surface 94 of the dust collecting plate 37 is fixed with a dust collecting net 38, the dust collecting net 38 covers the dust collecting opening, the top surface 95 of the dust collecting plate 37 is provided with a dust collecting cloth 39, the dust collecting cloth 39 is a product in the prior art, in the embodiment, a gauze is adopted as the dust collecting cloth 39, water flow can pass through the gauze, dust is blocked and filtered by the gauze to play a role of filtering dust, the dust collecting cloth 39 covers the dust collecting opening, a locking frame 40 is fixed in the dust collecting opening, the locking frame 40 is abutted against the dust collecting net 38, so that the dust collecting cloth 39 is clamped between the locking frame 40 and the dust collecting net 38 to be fixed, the top of the dust collecting plate 37 is provided with an annular groove 37a around the circumferential direction, an, the top surface of the guide strip 42 is provided with a guide groove 42a penetrating through the top surface and the bottom surface of the guide strip, the guide groove 42a is opposite to the socket 33a at the top of the filter box 33, the bottom of the filter cavity of the filter box 33 is fixed with a clamping seat, the clamping seat comprises a first baffle plate 43 and a second baffle plate 44, the bottom end of the first baffle plate 43 is fixed with the bottom of the filter cavity, the bottom end of the second baffle plate 44 is fixed with the bottom of the filter cavity, a clamping groove 45 is formed between the first baffle plate 43 and the second baffle plate 44, and the clamping groove 45 is opposite to. The working principle is as follows: the dust collecting cloth 39 covers the dust collecting opening, the dust collecting cloth 39 is fixed through the locking frame 40, the locking frame 40 is pressed in through interference fit with the dust collecting opening and is fixed with the dust collecting plate 37, the bottom end of the dust collecting plate 37 is inserted into the filter box 33 towards the socket 33a, the bottom end of the dust collecting plate 37 is clamped into the clamping groove 45 between the first baffle 43 and the second baffle 44, the annular sealing ring 41 on the dust collecting plate 37 is clamped into the guide groove 42a of the guide strip 42 to play a role of sealing, water in the filter box 33 is prevented from overflowing from the socket 33a, water in the filter box 33 flows through the dust collecting cloth 39 and the dust collecting net 38, dust in the water is stopped on the dust collecting cloth 39 to be filtered, when the dust collecting cloth 39 needs to be replaced, the dust collecting plate 37 is pulled out of the filter box 33 from the socket 33a, the locking frame 40 is detached from the dust collecting plate 37, the dust collecting cloth 39 is replaced and is detachably arranged.

A conveying device for conveying the sand discharged from the sand discharge port is arranged below the dust removing box 22, the conveying device comprises a conveying belt 46, a driving roller 47 and a driven roller 48, the conveying belt 46 is sleeved between the driving roller 47 and the driven roller 48, a water collecting tank 49 is arranged below the conveying belt 46, the driving roller 47 is rotatably arranged on a first support 50, the driven roller 48 is rotatably arranged on a second support 51, the driving roller 47 is connected with a driving mechanism III capable of rotating the driving roller, in the embodiment, the driving mechanism III comprises a driving motor III 96, a machine body of the driving motor III is fixed on the first support 50 through the support, a driving belt pulley 97 is fixed on an output shaft of the driving motor III, a driven belt pulley 98 is fixed on the driving roller 47, a driving belt 99 is sleeved between the driving belt pulley and the driven belt pulley, a magnetic rod 52 is further arranged in the driven roller 48, water draining holes communicated with the front side and the back side of the conveying belt 46 are, a barrier strip 53 is transversely arranged above the conveying belt 46, the bottom end of the barrier strip 53 is close to the top surface of the conveying belt 46, and the distance is 10mm in the embodiment; the one end that conveyer belt 46 is located initiative roller 47 is the input, and the one end that is located driven roller 48 is the output, and the input of conveyer belt 46 is located the below of sand discharge gate 36, and the below of the output of conveyer belt 46 is provided with in an inclined manner and leads sand plate 54, and it is fixed with support two 51 to lead sand plate 54, and the below of leading sand plate 54 is provided with third sand collection bucket 55, and the below of driven roller 48 is provided with a recycling bin 56. The working principle is as follows: the sand discharge door 36 is opened, the sand removed in the dust removing box 22 and water flow into the conveying belt 46 from the sand discharge door 36, the water on the conveying belt 46 flows downwards into the water collecting tank 49 arranged below the conveying belt 46 through the water draining holes, and the sand on the conveying belt 46 is conveyed to the output end of the conveying belt 46 and falls into the third sand collecting barrel 55 through the sand guide plate 54. The purpose of the barrier 53 transversely disposed above the conveyor belt 46 is to stack the sand falling from the sand discharge gate 36 onto the conveyor belt 46, so as to prevent the sand from being drained, and the sand on the conveyor belt 46 is evenly smeared by the barrier 53 through the barrier 53 when passing below the barrier 53, so as to prevent the sand from being drained. The driven roller 48 is provided with a magnetic rod 52, which is used for collecting sand, some magnetized sand and some fine metal minerals, such as fine iron ore and the like, are often included in the collected sand, the magnetized sand and the fine metal minerals affect the casting performance of the raw sand, the sand and the fine metal minerals are separated through the magnetic rod 52, when the magnetized sand or the metal minerals are conveyed to the position of the driven roller 48 along the conveyer belt 46, due to the magnetic attraction of the magnetic rod 52, the sand cannot fall onto the sand guide plate 54 along with the sand, the sand or the metal minerals are continuously adsorbed on the conveyer belt 46 and conveyed to the bottom side of the driven roller 48, and along with the continuous conveying of the conveyer belt 46, when the sand or the metal minerals are far away from the magnetic rod 52, the magnetic attraction is weakened, and the sand or the metal.

As shown in fig. 9, the sand drying device is used for drying sand, the sand drying device includes a second vibration tray, the second vibration tray includes a second tray body 57 with a top opening, a second material storage chamber 58 is provided in the second tray body 57, a second spiral track 59 spirally rising is fixed on the inner wall of the second tray body 57, the bottom end of the second spiral track 59 is connected with the bottom surface of the second material storage chamber 58, the top end of the second spiral track 59 extends out of the top opening of the second tray body 57 and is connected with a material guide plate 60, a second material guide pipe 61 is vertically fixed in the second material storage chamber 58, the bottom end of the second material guide pipe 61 is fixed with the bottom center of the second material storage chamber 58, the top end of the second material guide pipe 61 is connected with a second hopper 62, a second material guide opening 61a communicating the inner cavity of the second material guide pipe 61 and the second material storage chamber 58 is provided at the bottom end of the second material guide pipe 61, a spiral material guide pipe 63 is fixed on the inner wall of the second tray body 57, the outer wall of the air guide pipe 63 is fixed with the inner wall of the second disc body 57, the air guide pipe 63 and the second spiral track 59 alternately spiral up and down along the inner wall of the second disc body 57, the bottom end of the air guide pipe 63 penetrates through the second disc body 57 and is connected with a fan heater 64, the top side of the air guide pipe 63 is provided with a plurality of upper air guide holes 63a, the bottom side of the air guide pipe 63 is provided with a plurality of lower air guide holes 63b, the upper air guide holes 63a are uniformly distributed along the length direction of the air guide pipe 63, the lower air guide holes 63b are uniformly distributed along the length direction of the air guide pipe 63, in the embodiment, the hole centers of the adjacent upper air guide holes 63a are distributed at a 50mm interval, and the hole centers of the lower. The working principle is as follows: the sand collected by the third sand collecting barrel 55 is poured into the second hopper 62, the sand in the second hopper 62 falls into the bottom of the second material storage cavity 58 along the second material guiding pipe 61 and overflows from the second material guiding port 61a, under the action of the second vibrating tray, the sand overflowing from the second material guiding port 61a enters the second spiral track 59 and rises along the second spiral track 59, the sand rises to the material guiding plate 60 and falls out for collection, and after the sand overflowing from the second material guiding port 61a enters the second spiral track 59, the sand in the second material guiding pipe 61 continuously overflows from the second material guiding port 61a for supplement. The air guide pipe 63 and the second spiral track 59 are alternately and spirally wound upwards from bottom to top along the inner wall of the second disc body 57, hot air blown out from the air guide holes 63b at the bottom of the second spiral track 59 blows towards the sand on the second track surface to dry the sand in the rising process of the second spiral track 59, hot air blown out from the air guide holes 63a at the upper part of the second spiral track 59 heats the bottom of the second spiral track 59 to promote the evaporation of water in the sand on the second spiral track 59, and the sand is scattered and spread on the second spiral track surface under the vibration effect of the second vibration disc in the rising process of the sand along the second spiral track 59.

As shown in fig. 10, 11, 12 and 13, the dried sand is collected by a sand collecting device, the sand collecting device includes a horizontally disposed rotating disc 65, a plurality of placing slots 65a are circumferentially fixed on the top surface of the rotating disc 65, in this embodiment, the number of the placing slots 65a is eight, the placing slots 65a are uniformly distributed along the circumferential direction of the rotating disc 65, an object placing plate 66 is disposed on the top of the placing slots 65a, a pressure sensor is disposed between the placing slots 65a and the object placing plate 66, the pressure sensor is connected with a controller 67, the pressure sensor and the controller 67 are products of the prior art, the controller 67 is a PLC programmable controller 67, a sand collecting frame 68 is disposed on the object placing plate 66, the sand collecting frame 68 includes a top ring 69 and a bottom ring 70, the top ring 69 and the bottom ring 70 are connected and fixed by a first vertical rod 71 and a second vertical rod 72, in this embodiment, a third vertical rod 88 is further fixedly connected between the top ring 69 and the bottom ring 70, the rigidity is improved, a bag filled with sand is filled between a larger gap between a first upright rod 71 and a second upright rod 72 on the opposite side of a third upright rod 88, the top end of the first upright rod 71 is fixed with one side of a top ring 69, the bottom end of the first upright rod 71 is fixed with one side of a bottom ring 70, the top end of the second upright rod 72 is fixed with the opposite end of the top ring 69, the bottom end of the second upright rod 72 is fixed with the opposite side of the bottom ring 70, the top ring 69 and the bottom ring 70 are aligned and parallel up and down, a first semi-circular-arc-shaped press ring 92 and a second semi-circular-arc-shaped press ring 93 are hinged on the top ring 69, when the first press ring 92 and the second press ring 93 rotate to the horizontal state, the first press ring 92 and the second press ring 93 form a circular ring to be abutted against the top ring 69, the first press ring 92 and the second press ring 93 are hinged with the top ring 69 through a hinged seat 87, a material guide hopper 73 is arranged above the placement, the bottom of the sand drying device is provided with a discharge hole, a feed inlet of the material guide hopper 73 is positioned below the material guide plate 60 in the sand drying device, an electromagnetic valve 74 is arranged at the discharge hole, and the electromagnetic valve 74 is connected with the controller 67 in a wireless mode; a plurality of pulleys 75 are fixed at the bottom of the turntable 65, in this embodiment, four pulleys 75 are provided, the plurality of pulleys 75 are uniformly distributed along the circumferential direction of the turntable 65, an annular guide rail 76 is provided at the bottom of the turntable 65, the guide rail 76 is fixed on a support seat 77, the support seat 77 is supported on the ground through four support legs, the plurality of pulleys 75 are supported on the guide rail 76 and can roll along the guide rail 76, a rotating shaft is fixed at the center of the bottom of the turntable 65, a stepping motor 78 is fixed at the bottom of the support seat 77, a machine body of the stepping motor 78 is fixed with the support seat 77 through a bracket, an output shaft of the stepping motor 78 passes through the support seat 77 and is connected with the rotating shaft, the stepping motor 78 is connected with the controller 67, a vertical upright rod 79 is vertically fixed at the top of the support seat 77, a transverse rod 80 is transversely fixed at the top of the upright rod 79, the transverse rod 80 is fixed with an infrared emitter 82, the infrared receivers 81 and the infrared emitters 82 are wirelessly connected with the controller 67, the number of the infrared receivers 81 is eight, the infrared receivers 81 are mounted on the turntable 65 outside the placing groove 65a and are vertically opposite to the infrared emitters 82 when rotating to the lower part of the infrared emitters 82 along with the turntable 65. The working principle is as follows: the dried sand in the sand drying device falls into a material guide hopper 73 of the sand collecting device from a material guide plate 60, a bag for containing the sand is placed into a sand collecting frame 68, the top opening of the bag is expanded into a circular shape, a first rotary pressing ring 92 and a second rotary pressing ring 93 are erected, the top opening of the bag is turned open and is buckled on a top ring 69 along the top ring 69 of the sand collecting frame 68, then the first rotary pressing ring 92 and the second rotary pressing ring 93 are placed down to be abutted against the top ring 69, the top opening of the bag is fixed on the top ring 69, the sand entering the material guide hopper 73 falls onto the bag in the sand collecting frame 68 from a bottom discharge port of the material guide hopper 73, when the bag is filled with the sand, a pressure sensor arranged between a placing groove 65a and a placing plate 66 feeds weight information back to a controller 67, the controller 67 controls an electromagnetic valve 74 at the discharge port to be closed, then controls a stepping motor 78 to rotate to enable a turntable 65, the top surface of the turntable 65 is provided with, an infrared emitter 82 is fixed on the cross bar 31, when the turntable 65 rotates to enable the next sand collecting frame 68 to be positioned below the material guiding hopper 73, an infrared receiver 81 positioned beside the sand collecting frame 68 below the material guiding hopper 73 receives an infrared signal emitted by the infrared emitter 82 and feeds the signal back to the controller 67, the controller 67 controls the stepping motor 78 to stop rotating, and then controls the electromagnetic valve 74 of the material guiding hopper 73 to be opened, so that sand in the material guiding hopper 73 falls into a bag in the sand collecting frame 68 below the material guiding hopper for collection.

The first driving mechanism comprises a first driving motor 83, a machine body of the first driving motor 83 is fixed with the top of the sand filtering box 7 through a support, a cross-shaped reinforcing rib 84 is fixed on a cone tail portion 10b of the sand filtering net 10, a driving shaft 85 is fixed from the cone top portion 10a of the sand filtering net 10 to the center of the reinforcing rib, the bottom end of the driving shaft 85 is fixed with the center of the reinforcing rib, the top end of the driving shaft 85 penetrates out of the cone top portion 10a of the sand filtering net 10, the cone top portion 10a of the sand filtering net 10 is fixed with the driving shaft 85, reinforcing ribs 89 are fixed on the conical surface of the sand filtering net 10, the rigidity of the sand filtering net 10 is improved, and the top end of the driving shaft 85 extends out of.

The second driving mechanism comprises a second driving motor 86, a machine body of the second driving motor 86 is fixed with the bottom of the dust removing box 22 through a support, and an output shaft of the second driving motor 86 is connected with the bottom end of the first impeller shaft 26.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although 1, the first disc body, is used more herein; 2. a first material storage cavity; 3. a first spiral track; 3a, a protrusion; 4. a first material guide pipe; 4a, a first material guide port; 5. a first hopper; 6. a first sand collection barrel; 7. a sand filtering box; 7a, a drain hole; 7b, a side door; 8. a water collection barrel; 9. a second sand collection barrel; 9a, drainage holes, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A casting raw sand screening device comprises a sand crushing device and a sand filtering device and is characterized in that the sand crushing device comprises a first vibration disc, the first vibration disc comprises a first disc body (1) with a top opening, a first storage cavity (2) is arranged in the first disc body (1), a first spiral track (3) which spirally rises is fixed on the inner wall of the first disc body (1), a plurality of conical protruding parts (3a) are uniformly distributed on the top surface of the first spiral track (3), the bottom end of the first spiral track (3) is connected with the bottom surface of the first storage cavity (2), the top end of the first spiral track (3) extends out of the top opening of the first disc body (1), a first guide pipe (4) is vertically fixed in the first storage cavity (2), the bottom end of the first guide pipe (4) is fixed with the center of the bottom of the first storage cavity (2), and the top end of the first guide pipe (4) is connected with a first hopper (5), a first material guide port (4a) communicated with the inner cavity of the first material guide pipe (4) and the first material storage cavity (2) is formed in the bottom end of the first material guide pipe (4), and a first sand collecting barrel (6) is arranged below the top end of the first spiral track (3);

the sand filtering device comprises a sand filtering box (7), the sand filtering box (7) is provided with an inner cavity, the top of the sand filtering box (7) is covered with a box cover, supporting legs are fixed at the bottom of the sand filtering box (7), a drain hole (7a) is formed in the bottom of the sand filtering box (7), a water collecting barrel (8) is arranged below the sand filtering box (7), a second sand collecting barrel (9) is arranged at the center of the bottom of the inner cavity of the sand filtering box (7), a draining hole (9a) is formed in the bottom of the second sand collecting barrel (9), a sand filtering mechanism is arranged above the second sand collecting barrel (9), the sand filtering mechanism comprises a conical sand filtering net (10), the sand filtering net (10) comprises a conical top part (10a) and a conical tail part (10b), the conical top part (10a) is vertically arranged upwards, the conical tail part (10b) is positioned above the second sand collecting barrel (9), and the sand filtering net (10) is connected with a driving mechanism which can enable the sand filtering net to rotate around the axis line of the sand, a side door (7b) is arranged on the side wall of the sand filtering box (7); the top of the sand filtering box (7) is transversely provided with a sand collecting pipe (11), the sand collecting pipe (11) is upwards connected with a sand guide pipe (13) through a three-way joint (12), the top end of the sand guide pipe (13) is connected with a sand hopper (14), one end of the sand collecting pipe (11) is connected with a turbulence box (15), a turbulence cavity is arranged inside the turbulence box (15), one side of the turbulence box (15) is provided with a water inlet hole communicated with the turbulence cavity, the water inlet hole is connected with one end of the sand guide pipe (13), the other side of the turbulence box (15) is provided with a water outlet hole communicated with the turbulence cavity, the water outlet hole is connected with a spray head (18) through a connecting pipe, the connecting pipe penetrates into the sand filtering box (7) and enables the spray head (18) to face the conical sand filtering net (10), an impeller I (16) and an impeller II (17) are rotationally arranged in the turbulence box (15), the other end of the sand guide pipe (13) is connected with a booster pump (19) through the, the booster pump (19) is connected with a tap water tap through a connecting pipe; the sand filtering box is characterized in that a shifting strip (20) is arranged above the sand filtering net (10), the shifting strip (20) is parallel to a bus of the conical sand filtering net (10), bristles (21) are arranged on the bottom surface of the shifting strip (20), the bristles (21) are abutted to the net surface of the sand filtering net (10), and the shifting strip (20) is fixed to the bottom of the box cover of the sand filtering box (7) through a connecting rod.

2. The foundry sand screening device according to claim 1, wherein the first driving mechanism comprises a first driving motor (83), a body of the first driving motor (83) is fixed with the top of the filter flask (7) through a bracket, a cross-shaped reinforcing rib (84) is fixed at the cone tail part (10b) of the sand screen (10), a driving shaft (85) is fixed from the cone top part (10a) of the sand screen (10) to the center of the cross-shaped reinforcing rib (84), the bottom end of the driving shaft (85) is fixed with the cross center of the cross-shaped reinforcing rib (84), the top end of the driving shaft (85) penetrates out of the cone top part (10a) of the sand screen (10), the cone top part (10a) of the sand screen (10) is fixed with the driving shaft (85), the top end of the driving shaft (85) extends out of the filter sand box (7) and is connected with an output shaft of the first driving motor (83).

3. A foundry sand screening device according to claim 1, characterized in that the projections (3a) are conical, the diameter of the bottom end of the projections (3a) is 2-5mm, the height of the projections (3a) is 2-4mm, and the center-to-center distance between adjacent projections (3a) is 5-8 mm.

4. A foundry sand screening device according to claim 1, characterized in that first dams (91) are fixed to both sides of the first spiral track (3) extending out of the top opening portion of the first disc (1).

5. A foundry sand screening plant according to claim 1, characterized in that the first hopper (5) is fixed to the top mouth of the first tray (1) by means of a support bar.