Crushing and screening device for precoated sand

Abstract

The invention provides a crushing and screening device for precoated sand, and relates to the technical field of precoated sand processing.The crushing and screening device comprises a shell, a crushing cavity and a screening cavity which communicate with each other are sequentially formed in the shell from top to bottom, a net rack plate is arranged in the screening cavity, and a through flow guide hole matched with the inner wall of the screening cavity is formed in the top of the net rack plate; a screening net is arranged in the flow guide hole; a dispersing plate used for stirring the precoated sand on the surface of the screening net is rotationally arranged in the screening cavity. According to the design, crushed precoated sand entering the screening cavity from the crushing cavity is uniformly dispersed to the surface of the screening net through the dispersion plate, so that the screening resistance is reduced, the precoated sand is prevented from being concentrated, the effective screening area is increased, and the screening efficiency is improved. The screening device is reasonable in structure, large in effective screening area and high in screening efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coated sand processing, and particularly relates to a crushing and screening device for coated sand. Background Art

[0002] Coated sand mainly uses high-quality selected natural quartz sand as the original sand, and thermoplastic phenolic resin, hexamine and reinforcing agents as raw materials. According to the different technical requirements of users, the proportion is appropriately adjusted in terms of curing speed, demoulding property, fluidity, collapsibility, surface finish of castings, storage, etc. It is one of the best molding materials for automobiles, tractors, hydraulic parts, etc. A crushing and screening device is required in the processing of coated sand.

[0003] In the prior art, when the crushing and screening device is in use, the crushed coated sand is directly screened through the screening mesh. Due to the concentrated impact, the screen holes bear too much pressure in a short time, the screening resistance increases, and the effective screening area decreases, resulting in local blockage or concentrated screening pressure, affecting the screening efficiency. There is an urgent need for a crushing and screening device for coated sand to solve the above problems. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a crushing and screening device for coated sand to solve the problems proposed in the above background art. The structure of the present invention is reasonable, the effective screening area is large, and the screening efficiency is high.

[0005] In order to achieve the above purpose, the present invention is realized by the following technical solutions: A crushing and screening device for coated sand, comprising: A housing, inside which there are sequentially arranged a crushing chamber and a screening chamber communicating with each other from top to bottom. Inside the screening chamber, there is a grid plate. The top of the grid plate is provided with a through-flow guiding hole matching the inner wall of the screening chamber, and a screening mesh is arranged inside the guiding hole. A dispersion plate is rotatably arranged inside the screening chamber for stirring the coated sand on the surface of the screening mesh.

[0006] Furthermore, it further includes a dispersion component arranged inside the screening chamber and used for driving the dispersion plate to rotate; The dispersion component includes a dispersion motor arranged on the side wall of the housing. Inside the screening chamber, fixed columns are symmetrically arranged. An installation box is arranged between the fixed columns. The output shaft of the dispersion motor is provided with a first driving shaft located inside the installation box. The end of the first driving shaft is provided with a first helical gear located inside the installation box. The side wall of the first helical gear is engaged with a second helical gear. The bottom of the second helical gear is provided with a second driving shaft penetrating through the bottom of the installation box. A plurality of dispersion plates are arranged on the side wall of the second driving shaft.

[0007] Further, a rotating column penetrating through the top of the mounting box is provided at the top of the second helical gear, and a conical plate is provided at the top of the rotating column.

[0008] Further, a rotating groove communicating with the screening cavity is formed inside the housing, a driving assembly for driving the wire mesh plate to rotate along the rotating groove is arranged inside the housing, a discharge port communicating with the rotating groove is formed in the side wall of the housing, a guide plate is arranged inside the discharge port, an aggregate hopper is arranged at the bottom of the wire mesh plate, a discharge port communicating with the lower side of the inner wall of the screening cavity is formed in the side wall of the housing, and an inclined surface inclined downward is arranged on the lower side of the inner wall of the screening cavity.

[0009] Further, the inner diameter of the top of the aggregate hopper is larger than the inner diameter of the inner wall of the diversion hole, and the inner diameter of the top of the aggregate hopper is larger than the inner diameter of the bottom of the aggregate hopper.

[0010] Further, a through groove communicating with the diversion hole is formed on one side of the top of the wire mesh plate, a plug plate located inside the through groove is arranged on the upper side of the inner wall of the rotating groove, an arc groove matching the inner wall of the screening cavity is formed on one side of the plug plate close to the screening cavity, the screening cavity is circular, and the arc groove is flush with the vertical surface of the inner wall of the screening cavity.

[0011] Further, the driving assembly includes a driving motor arranged on the side wall of the housing, and a rotating shaft penetrating through the wire mesh plate is arranged on the output shaft of the driving motor.

[0012] Further, a telescopic support member for supporting the bottom of the wire mesh plate is arranged inside the housing.

[0013] Further, a feed channel communicating with the crushing cavity is arranged at the top of the housing, and a crushing assembly is arranged inside the crushing cavity; The crushing assembly includes a pair of crushing rollers arranged inside the crushing cavity, a driving gear is meshed between the pair of crushing rollers, and a crushing motor connected to one of the crushing rollers is arranged on the side wall of the housing.

[0014] Further, a diversion groove is arranged between the crushing cavity and the screening cavity, the top of the diversion groove matches the inner wall of the crushing cavity, and the bottom of the diversion groove matches the inner wall of the screening cavity.

[0015] The beneficial effects achieved by the present invention with the above structure are as follows: In the present invention, the coated sand pulverized and entering the screening cavity from the crushing cavity is evenly dispersed on the surface of the screening mesh through the dispersion assembly, reducing the screening resistance, avoiding the concentration of the coated sand, increasing the effective screening area, and improving the screening efficiency; Drive the grid plate to rotate along the rotating groove through the driving component. The rotation of the grid plate drives the screening mesh to tilt at a certain angle, and the unqualified coated sand flows out from the discharge port along the material guide plate, which is convenient for dumping the screened unqualified coated sand. By providing a conical aggregate hopper at the bottom of the grid plate, while not affecting the rotation of the grid plate, it is convenient for the screened qualified materials to completely fall on the inclined surface on the lower side of the inner wall of the screening chamber and separate from the housing, improving the thoroughness of discharging. Brief Description of the Drawings

[0016] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objectives and advantages of the present invention will become more obvious: Figure 1 Is a perspective view of a crushing and screening device for coated sand according to an embodiment of the present invention; Figure 2 Is a rear view cross-sectional view of a crushing and screening device for coated sand according to an embodiment of the present invention; Figure 3 Is a cross-sectional perspective view of a crushing and screening device for coated sand according to an embodiment of the present invention; Figure 4 Is a right view cross-sectional view of a crushing and screening device for coated sand according to an embodiment of the present invention; Figure 5 Is a cross-sectional perspective view of a crushing and screening device for coated sand according to an embodiment of the present invention from another perspective; Figure 6 Is a perspective view of the connection between the grid plate and the dispersion component of a crushing and screening device for coated sand according to an embodiment of the present invention; Figure 7 Is a cross-sectional perspective view of the connection between the grid plate and the dispersion component of a crushing and screening device for coated sand according to an embodiment of the present invention; Figure 8 Is a perspective view of the connection between the grid plate and the telescopic support member of a crushing and screening device for coated sand according to an embodiment of the present invention; In the figure: 1. Housing; 1001. Crushing chamber; 1002. Diversion groove; 1003. Screening chamber; 2. Crushing component; 21. Crushing motor; 22. Crushing roller; 23. Driving gear; 3. Feeding channel; 4. Dispersion component; 41. Dispersion motor; 42. First driving shaft; 43. Second driving shaft; 44. First helical gear; 45. Second helical gear; 46. Installation box; 47. Dispersion plate; 48. Fixed column; 5. Discharge port; 6. Telescopic support member; 7. Material guide plate; 8. Driving component; 81. Driving motor; 82. Rotating shaft; 9. Grid plate; 91. Diversion hole; 10. Screening mesh; 11. Aggregate hopper; 12. Rotating groove; 13. Through groove; 14. Plug plate; 141. Arc groove; 15. Conical plate; 151. Rotating column; 16. Discharge port. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a crushing and screening device for coated sand, comprising: The housing 1 has a crushing chamber 1001 and a screening chamber 1003 which are interconnected from top to bottom. A grid plate 9 is provided inside the screening chamber 1003. A through-flow guide hole 91 which matches the inner wall of the screening chamber 1003 is provided on the top of the grid plate 9. A screening net 10 is provided inside the flow guide hole 91. A dispersion plate 47 is provided inside the screening chamber 1003 for stirring the coated sand on the surface of the screening net 10. The dispersion plate 47 is used to evenly disperse the crushed coated sand entering the screening chamber 1003 from the crushing chamber 1001 to the surface of the screening net 10, thereby reducing the screening resistance, avoiding the concentration of coated sand, increasing the effective screening area, and improving the screening efficiency.

[0019] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 , further comprising a dispersion assembly 4 disposed inside the screening chamber 1003 and used to drive the dispersion plate 47 to rotate; The dispersion component 4 includes a dispersion motor 41 arranged on the side wall of the housing 1. Fixed columns 48 are symmetrically arranged inside the screening chamber 1003. An installation box 46 is arranged between the fixed columns 48. A first drive shaft 42 located inside the installation box 46 is provided on the output shaft of the dispersion motor 41. A first helical gear 44 located inside the installation box 46 is provided at the end of the first drive shaft 42. A second helical gear 45 meshes with the side wall of the first helical gear 44. A second drive shaft 43 penetrating the bottom of the installation box 46 is provided at the bottom of the second helical gear 45. A plurality of dispersion plates 47 are arranged on the side wall of the second drive shaft 43. This design drives the first drive shaft 42 to rotate through the operation of the dispersion motor 41 in the dispersion component 4. The rotation of the first drive shaft 42 drives the first helical gear 44 to rotate. The rotation of the first helical gear 44 drives the second helical gear 45 to rotate. The rotation of the second helical gear 45 drives the second drive shaft 43 to rotate. The rotation of the second drive shaft 43 drives the dispersion plates 47 to stir and disperse the coated sand on the surface of the screening mesh 10, avoiding the concentration of the coated sand, increasing the effective screening area, and improving the screening efficiency. Among them, sealing bearings are provided at the connections between the first drive shaft 42, the second drive shaft 43 and the installation box 46 respectively. Heat dissipation holes are provided on the side wall of the installation box 46. There is a gap between the dispersion plate 47 and the diversion hole 91, which does not affect the rotation of the grid plate 9. In order to facilitate the feeding, a vibration motor is arranged on the housing 1 according to requirements. Since the surface of the fixed column 48 is arc-shaped, it avoids the retention of the coated sand on the surface of the fixed column 48.

[0020] Refer to Figure 2 and Figure 6 , a rotating column 151 penetrating the top of the installation box 46 is provided at the top of the second helical gear 45. A conical plate 15 is provided at the top of the rotating column 151. This design drives the conical plate 15 to rotate through the rotation of the rotating column 151 under the action of the second helical gear 45, avoiding the coated sand from falling on the installation box 46. At the same time, the coated sand flows along the conical surface of the conical plate 15, further uniformly dispersing the coated sand. Among them, a rotating bearing is provided at the connection between the rotating column 151 and the installation box 46. The cross-sectional area of the lower end surface of the conical plate 15 is larger than the cross-sectional area of the installation box 46, avoiding the coated sand from falling on the installation box 46 during the flowing process.

[0021] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 5, a rotating groove 12 communicating with the screening cavity 1003 is provided inside the housing 1. A driving assembly 8 for driving the grid plate 9 to rotate along the rotating groove 12 is arranged inside the housing 1. A discharge port 5 communicating with the rotating groove 12 is provided on the side wall of the housing 1. A guide plate 7 is arranged inside the discharge port 5. A collecting hopper 11 is arranged at the bottom of the grid plate 9. A discharge port 16 communicating with the lower side of the inner wall of the screening cavity 1003 is provided on the side wall of the housing 1. The lower side of the inner wall of the screening cavity 1003 is provided with an inclined plane sloping downwards. This design drives the grid plate 9 to rotate along the rotating groove 12 through the driving assembly 8. The rotation of the grid plate 9 drives the screening mesh 10 to tilt at a certain angle, facilitating the dumping of the unqualified coated sand and flowing out from the discharge port 5 along the guide plate 7; the qualified coated sand flows out from the discharge port 16 along the inclined plane. Among them, the longitudinal length of the guide plate 7 is greater than the longitudinal length of the rotating groove 12. A guide groove is provided on the guide plate 7. The guide groove is U-shaped. The longitudinal length of the guide groove of the guide plate 7 is the same as the longitudinal length of the rotating groove 12, facilitating the complete embedding of the guide plate 7 inside the discharge port 5 and improving the thoroughness of discharging; the cross-sectional area of the rotating groove 12 is greater than the cross-sectional area of the screening cavity 1003.

[0022] Refer to Figure 2 and Figure 3 , the inner diameter of the top of the collecting hopper 11 is greater than the inner wall diameter of the diversion hole 91, and the inner diameter of the top of the collecting hopper 11 is greater than the inner diameter of the bottom of the collecting hopper 11. This design facilitates the coated sand inside the diversion hole 91 to completely flow into the collecting hopper 11 through the screening mesh 10 and finally flow out from the discharge port 16; at the same time, the conical shape of the collecting hopper 11 does not affect the rotation of the grid plate 9, and there will be no interference between the two.

[0023] Refer to Figure 2 , Figure 3 , Figure 6 and Figure 8 , a through groove 13 communicating with the diversion hole 91 is provided on one side of the top of the grid plate 9. A blocking plate 14 located inside the through groove 13 is provided on the upper side of the inner wall of the rotating groove 12. An arc groove 141 matching the inner wall of the screening cavity 1003 is provided on the side of the blocking plate 14 close to the screening cavity 1003. The screening cavity 1003 is circular, and the arc groove 141 is flush with the vertical plane of the inner wall of the screening cavity 1003. This design ensures that when the unqualified coated sand does not need to be discharged, the arc groove 141 of the blocking plate 14 is flush with the screening cavity 1003 to prevent the coated sand from flowing out; when the unqualified coated sand needs to be taken out, the blocking plate 14 is separated from the through groove 13 to ensure that the unqualified coated sand flows into the guide plate 7 through the through groove 13; among them, the longitudinal length of the through groove 13 is less than the longitudinal length of the discharge port 5, facilitating the coated sand to completely fall inside the guide plate 7.

[0024] Refer to Figure 2 , Figure 6 and Figure 7, the driving assembly 8 includes a driving motor 81 arranged on the side wall of the housing 1, and a rotating shaft 82 penetrating through the grid plate 9 is arranged on the output shaft of the driving motor 81. This design drives the rotating shaft 82 to rotate through the operation of the driving motor 81 in the driving assembly 8, and the rotating shaft 82 drives the grid plate 9 to rotate, facilitating the tilting of the screening mesh 10 on the grid plate 9 and facilitating the removal of unqualified coated sand on the screening mesh 10.

[0025] Referring to Figure 3 and Figure 8 , a telescopic support member 6 for supporting the bottom of the grid plate 9 is arranged inside the housing 1. This design facilitates the support of the side of the bottom of the grid plate 9 far from the rotating shaft 82 through the telescopic support member 6, improving the stability of screening; among them, the telescopic support member 6 can be a component with a telescopic shaft such as an electric push rod, a cylinder, a hydraulic cylinder, etc., and the telescopic shaft of the telescopic support member 6 penetrates through the material guiding plate 7.

[0026] Referring to Figure 2 and Figure 4 , a feeding channel 3 communicating with the crushing chamber 1001 is arranged at the top of the housing 1, and a crushing assembly 2 is arranged inside the crushing chamber 1001; The crushing assembly 2 includes a pair of crushing rollers 22 arranged inside the crushing chamber 1001, a driving gear 23 is meshed between the pair of crushing rollers 22, and a crushing motor 21 connected to one of the crushing rollers 22 is arranged on the side wall of the housing 1. This design drives the crushing rollers 22 to rotate through the operation of the crushing motor 21 in the crushing assembly 2, and under the action of the driving gear 23, the pair of crushing rollers 22 rotate to perform a crushing operation on the coated sand; among them, two driving gears 23 are arranged and are respectively connected to the pair of crushing rollers 22; among them, the longitudinal length of the feeding channel 3 is less than the longitudinal length of the crushing rollers 22, and a guiding plate for guiding the coated sand flowing out of the feeding channel 3 between the pair of crushing rollers 22 is arranged on the upper side of the inner wall of the housing 1.

[0027] Referring to Figure 2 , Figure 3 and Figure 5 , a guiding groove 1002 is arranged between the crushing chamber 1001 and the screening chamber 1003, the top of the guiding groove 1002 matches the inner wall of the crushing chamber 1001, and the bottom of the guiding groove 1002 matches the inner wall of the screening chamber 1003. This design facilitates the completely falling of the screened coated sand from the crushing chamber 1001 into the screening chamber 1003 through the guiding groove 1002.

[0028] Referring to Figures 1 - 8 , as an embodiment of the present invention: when it is necessary to crush and screen the coated sand, the staff sends the coated sand to be crushed into the feeding channel 3, drives the crushing rollers 22 to rotate through the operation of the crushing motor 21 in the crushing assembly 2, and under the action of the driving gear 23, the pair of crushing rollers 22 rotate to perform a crushing operation on the coated sand.

[0029] The crushed coated sand enters the interior of the screening chamber 1003 from the crushing chamber 1001 along the diversion groove 1002. Under the action of the conical plate 15, the coated sand is initially dispersed. Then, the dispersion motor 41 in the dispersion assembly 4 operates to drive the first drive shaft 42 to rotate. The rotation of the first drive shaft 42 drives the first helical gear 44 to rotate. The rotation of the first helical gear 44 drives the second helical gear 45 to rotate. The rotation of the second helical gear 45 drives the second drive shaft 43 to rotate. The rotation of the second drive shaft 43 drives the dispersion plate 47 to stir and disperse the coated sand on the surface of the screening mesh 10, avoiding the concentration of the coated sand, increasing the effective screening area, and improving the screening efficiency.

[0030] The qualified coated sand flows out from the discharge port 16 along the inclined surface on the lower side of the inner wall of the screening chamber 1003, while the unqualified coated sand remains on the screening mesh 10. When it is necessary to remove the unqualified coated sand, first, the telescopic support member 6 operates to lose the support for the grid plate 9. Then, the drive motor 81 in the drive assembly 8 operates to drive the rotating shaft 82 to rotate. The rotation of the rotating shaft 82 drives the grid plate 9 to rotate along the rotation groove 12. The rotation of the grid plate 9 causes the screening mesh 10 to tilt, and at the same time, the blocking plate 14 disengages from the through groove 13, ensuring that the unqualified coated sand flows into the guide plate 7 through the through groove 13 and is discharged from the discharge port 5. After the unqualified coated sand is completely discharged, the drive assembly 8 drives the grid plate 9 back to the initial position, and the telescopic support member 6 continues to support the grid plate 9.

[0031] The above shows and describes the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A crushing and screening device for coated sand, characterized in that, Comprising: A housing (1), inside which there are successively arranged from top to bottom a crushing chamber (1001) and a screening chamber (1003) that are interconnected. Inside the screening chamber (1003), there is a grid plate (9). The top of the grid plate (9) is provided with a through-flow guiding hole (91) that matches the inner wall of the screening chamber (1003), and a screening mesh (10) is arranged inside the guiding hole (91). Inside the screening chamber (1003), there is a dispersion plate (47) rotatably arranged for stirring the coated sand on the surface of the screening mesh (10).

2. The crushing and screening device for coated sand according to claim 1, wherein, It further includes a dispersion assembly (4) arranged inside the screening chamber (1003) and used for driving the dispersion plate (47) to rotate. The dispersion assembly (4) includes a dispersion motor (41) arranged on the side wall of the housing (1). Inside the screening chamber (1003), fixed columns (48) are symmetrically arranged. An installation box (46) is arranged between the fixed columns (48). A first driving shaft (42) located inside the installation box (46) is provided on the output shaft of the dispersion motor (41). A first bevel gear (44) located inside the installation box (46) is provided at the end of the first driving shaft (42). A second bevel gear (45) is meshed with the side wall of the first bevel gear (44). A second driving shaft (43) passing through the bottom of the installation box (46) is provided at the bottom of the second bevel gear (45). A plurality of dispersion plates (47) are arranged on the side wall of the second driving shaft (43).

3. The crushing and screening device for coated sand according to claim 2, characterized in that, A rotating column (151) passing through the top of the installation box (46) is provided at the top of the second bevel gear (45), and a conical plate (15) is provided at the top of the rotating column (151).

4. The crushing and screening device for coated sand according to claim 1, characterized in that, A rotating groove (12) communicating with the screening chamber (1003) is opened inside the housing (1). A driving assembly (8) for driving the grid plate (9) to rotate along the rotating groove (12) is arranged inside the housing (1). A discharge port (5) communicating with the rotating groove (12) is opened on the side wall of the housing (1). A guiding plate (7) is arranged inside the discharge port (5). An aggregate hopper (11) is arranged at the bottom of the grid plate (9). A discharge port (16) communicating with the lower side of the inner wall of the screening chamber (1003) is opened on the side wall of the housing (1), and the lower side of the inner wall of the screening chamber (1003) is provided with an inclined surface sloping downward.

5. The crushing and screening device for coated sand according to claim 4, characterized in that, The inner diameter of the top of the aggregate hopper (11) is larger than the inner wall diameter of the guiding hole (91), and the inner diameter of the top of the aggregate hopper (11) is larger than the inner diameter of the bottom of the aggregate hopper (11).

6. The crushing and screening device for coated sand according to claim 4, wherein, One side of the top of the grid plate (9) is provided with a through groove (13) communicating with the diversion hole (91). On the upper side of the inner wall of the rotation groove (12), a blocking plate (14) located inside the through groove (13) is provided. On the side of the blocking plate (14) close to the screening cavity (1003), an arc groove (141) matching the inner wall of the screening cavity (1003) is provided. The screening cavity (1003) is circular, and the arc groove (141) is flush with the vertical plane of the inner wall of the screening cavity (1003).

7. The crushing and screening device for coated sand according to claim 4, characterized in that, The driving assembly (8) includes a driving motor (81) arranged on the side wall of the housing (1), and a rotating shaft (82) penetrating the grid plate (9) is arranged on the output shaft of the driving motor (81).

8. The crushing and screening device for coated sand according to claim 1, wherein, An expansion support member (6) for supporting the bottom of the grid plate (9) is arranged inside the housing (1).

9. The crushing and screening device for coated sand according to claim 1, characterized in that, A feed channel (3) communicating with the crushing cavity (1001) is arranged at the top of the housing (1), and a crushing assembly (2) is arranged inside the crushing cavity (1001). The crushing assembly (2) includes a pair of crushing rollers (22) arranged inside the crushing cavity (1001). A driving gear (23) is engaged between the pair of crushing rollers (22), and a crushing motor (21) connected to one of the crushing rollers (22) is arranged on the side wall of the housing (1).

10. The crushing and screening device for coated sand according to claim 1, wherein, A diversion groove (1002) is arranged between the crushing cavity (1001) and the screening cavity (1003). The top of the diversion groove (1002) matches the inner wall of the crushing cavity (1001), and the bottom of the diversion groove (1002) matches the inner wall of the screening cavity (1003).

Images