Sand mixer for casting machining

Abstract

The invention belongs to the field of sand mixers, and discloses a sand mixer for casting processing, which comprises a sand mixing tank, a feeding pipe mounted in the middle of the top end of the sand mixing tank, a driving assembly arranged in the middle of the bottom end of the sand mixing tank, a leakage net arranged below the feeding pipe in the sand mixing tank, leakage holes equidistantly formed in the peripheral side surface of the leakage net, and a funnel arranged below the leakage net. A grinding assembly is arranged in the sand mixing tank and located below the funnel, the grinding assembly is connected with a driving assembly, and a scattering assembly is further arranged on the driving assembly and located on the grinding assembly. Raw materials can be rapidly screened, ground, scattered and mixed, the raw materials are finer, on one hand, the small-batch production requirement can be met, on the other hand, the uniformity of sand components can be ensured, layering of a mixing system is avoided, in the overall discharging, grinding and mixing process, the fluidity of the materials is fully ensured, the machining blind area is reduced, and the machining efficiency is improved. And accumulation is prevented, so that the caking condition is avoided.

Description

Technical Field

[0001] The present invention relates to a sand mixer, and more specifically, to a sand mixer for casting processing. Background Art

[0002] As the core equipment of the casting sand treatment process, the core function of the sand mixer is to achieve uniform mixing of each component of the molding sand through mechanical action and ensure that the binder forms an effective coating layer on the surface of the sand grains, thereby endowing the molding sand with physical and chemical properties that meet the requirements of the casting process. This equipment has a decisive impact on the forming quality of the casting. Its mixing uniformity and coating integrity are directly related to the surface defect rate of the casting and the subsequent processing stability. There will be caking situations during sand storage (stacked placement and getting damp, etc.) and after the casting is used.

[0003] Most of the existing sand mixers for casting processing use roller-type or rotor-type sand mixers. The roller-type sand mixer realizes material mixing through the relative movement of the roller and the mixing cavity. However, during the mixing process, the regulation of material fluidity is insufficient, and local accumulation is likely to occur in the stirring blind area, leading to caking caused by the binder absorbing moisture. When processing materials with a wide particle size distribution, the coupling effect of uneven roller pressure and scraper wear will cause density stratification in the mixing system, destroying the uniformity of the molding sand components.

[0004] The rotor-type sand mixer relies on the centrifugal force field generated by the high-speed rotating rotor blades. The radial arrangement of the blades causes the material to form a radial circulating flow under the centrifugal action. The material particles are mixed under the action of collision, shear, and centrifugal force gradient between the blades. However, its radial arrangement of the blades will generate a non-uniform centrifugal force field during high-speed rotation, causing radial migration of coarse and fine particles due to the mass difference, further aggravating the mixing stratification phenomenon and affecting the mixing uniformity; Moreover, there are certain defects in the existing roller-type and rotor-type sand mixing devices: the volume of the mixing cavity is relatively large, and the amount of mixing. When used in small batches during daily use, the remaining mixed sand will be caused, and subsequent storage, etc. are likely to lead to caking situations, affecting the quality of the sand. Summary of the Invention

[0005] An object of the present invention is to provide a sand mixer for casting processing to solve the problem of uneven mixing and mixing stratification.

[0006] According to an aspect of the present invention, there is provided a sand mixer for casting processing, including a sand mixing tank. A feed pipe is installed in the middle of the top end of the sand mixing tank. A driving component is provided in the middle of the bottom end of the sand mixing tank. A filter screen is arranged below the feed pipe inside the sand mixing tank. The circumferential side of the filter screen is equidistantly provided with filter holes. A funnel is arranged below the filter screen. A grinding component is arranged below the funnel inside the sand mixing tank. The grinding component is used for grinding the sand fed by the funnel. The driving component is used for driving the grinding component. A dispersing component is drivingly arranged on the driving component. The dispersing component is located below the grinding component.

[0007] Optionally, the driving assembly includes a motor installed in the middle of the bottom end of the sand mixing tank. A rotating shaft is fixedly provided at the output end of the motor. The rotating shaft penetrates through the sand mixing tank and extends into the interior. A sealing ring is provided at the intersection of the rotating shaft and the sand mixing tank.

[0008] Optionally, the grinding assembly includes a grinding cone provided at the top end of the rotating shaft. A grinding cover is provided inside the sand mixing tank. The grinding cover is a hollow frustum shape. The inner diameter of the bottom of the funnel is smaller than the inner diameter of the top of the grinding cover. The grinding cone is eccentrically provided on the rotating shaft. When the rotating shaft drives the grinding cone to rotate, it rotates along the inner wall of the grinding cover.

[0009] In the present invention, the driving assembly cooperates with the grinding assembly to work, and can grind the screened raw materials to ensure the uniformity of the particle size of the raw materials. Compared with the prior art, it can screen the appropriate particle size during feeding, and then process the large particle size to ensure uniformity, without affecting the subsequent mixing operation and causing stratification of the mixing system, and ensuring the uniformity of the sand components.

[0010] Optionally, through holes are equidistantly arranged on the circumferential side surface of the grinding cone. An auxiliary cover is provided outside the grinding cone. The central axis of the auxiliary cover is on the central axis of the rotating shaft. Elastic columns corresponding to the through holes one by one are equidistantly provided on the inner wall of the auxiliary cover. And the outer circumferential side surface of the auxiliary cover is fixedly connected to the inner wall of the sand mixing tank through a fixing rod.

[0011] Optionally, elastic connecting pieces are equidistantly arranged on the circumferential side surfaces of the top and bottom of the grinding cone. The ends of the elastic connecting pieces are fixedly connected to the inner wall of the auxiliary cover.

[0012] In the present invention, the grinding cone cooperates with the auxiliary cover, which can assist in the grinding operation, and at the same time facilitate the pushing out of the raw materials in the through holes to avoid blockage, facilitate the discharge of the internal raw materials, and ensure the grinding effect.

[0013] Optionally, the dispersing assembly includes connecting rods equidistantly arranged on the circumferential side surface of the rotating shaft. A clamping block is fixedly provided at the end of the connecting rod. A dispersing plate is provided on the clamping block through an installation groove. The installation groove is opened at one end of the clamping block away from the connecting rod.

[0014] Optionally, a rotating bearing is sleeved outside the rotating shaft. The rotating bearing is located between the connecting rod and the grinding cone. A guide cover is fixedly provided on the outer ring of the bearing of the rotating bearing.

[0015] In the present invention, cooperating with the driving assembly can not only drive the grinding cone to work for grinding, but also drive the dispersing assembly to work. On the one hand, it can disperse and mix the raw materials with qualified screened particle sizes, and also facilitate the re-dispersing and mixing of the ground raw materials, ensuring the mixing effect and improving the mixing efficiency.

[0016] Optionally, in order to facilitate the feeding of raw materials and cooperate with a sieve net to conveniently screen raw materials of appropriate particle sizes, a material guiding member is provided at the top end inside the sand mixing tank, and the material guiding member is located between the feed pipe and the sieve net.

[0017] Optionally, the outer side wall of the funnel is connected to the inside of the sand mixing tank through a telescopic member, and a vibration motor is also provided on the outer side wall of the funnel.

[0018] Optionally, a fixing ring is provided on the circumferential side surface of the top of the sieve net, and an elastic member is fixedly provided on the outer circumferential side surface of the fixing ring, and the elastic member is connected to the inner wall of the sand mixing tank.

[0019] In the present invention, during the feeding process, the funnel can be assisted to reciprocate horizontally, thereby facilitating the feeding, improving the screening efficiency, and at the same time vibrating the sieve net to prevent the raw materials from getting stuck in the sieve holes and not affecting the screening operation.

[0020] Compared with the prior art, the advantages of the present invention include: (1) Through the mutual cooperation among various components, operations such as screening, grinding, and dispersing and mixing of raw materials can be quickly carried out, which is more precise. On the one hand, it can meet the production needs of small batches, avoid the remaining materials after large-scale production, which are not easy to store and lead to caking of the mixed sand, etc. On the other hand, it can ensure the uniformity of the sand components and avoid the layering of the mixing system.

[0021] (2) Through the synergistic effect of the sieve net screening and the grinding component, particle size grading treatment of the mixed materials is realized. The funnel, in cooperation with the telescopic member and the vibration motor, forms a dynamic screening system, enabling the materials meeting the particle size requirements to directly enter the mixing process, while the over-sized particles are secondarily processed by the eccentric grinding action of the grinding cone, ensuring that the particle size distribution of the mixing system approaches the ideal state and fundamentally eliminating the density layering phenomenon caused by particle size differences.

[0022] (3) Improvement in the comprehensive efficiency and quality: The integrated drive component synchronously drives the grinding cone and the dispersing plate to work, forming a "grinding first and then dispersing" composite mixing process. The annular grinding cavity formed by the grinding cover and the auxiliary cover generates a multi-dimensional shear force field, and in cooperation with the pulsed material discharge mechanism of the elastic column, the integrity of the binder coating is improved.

[0023] (4) During the overall feeding, grinding, and mixing processes, the fluidity of the materials is fully ensured, reducing the blind areas in processing, preventing accumulation, and thus avoiding caking.

[0024] (5) Through the material guiding member and the diversion cover, it is convenient to divert the materials during feeding and after grinding, facilitating screening and subsequent dispersing operations, and improving the processing efficiency. Description of the Drawings

[0025] The accompanying drawings forming a part of the specification depict embodiments of the present invention and, together with the specification, are used to explain the principles of the present invention.

[0026] Figure 1 It is an overall schematic diagram of a sand mixer for casting processing.

[0027] Figure 2 It is a schematic diagram of the internal structure of a sand mixer for casting processing.

[0028] Figure 3 It is a schematic diagram of the use of the structure on the hopper in a sand mixer for casting processing.

[0029] Figure 4 It is a schematic diagram of the structure of an auxiliary cover for covering a grinding cover in a sand mixer for casting processing.

[0030] Figure 5 It is a schematic diagram of the internal partial structure of a sand mixer for casting processing.

[0031] Figure 6 It is one of the schematic diagrams of the structure of the driving component and the dispersing component in a sand mixer for casting processing.

[0032] Figure 7 It is the second schematic diagram of the structure of the driving component and the dispersing component in a sand mixer for casting processing.

[0033] Description of the drawings: 1. Sand mixing tank; 2. Feed pipe; 3. Motor; 4. Material guiding part; 5. Sieve; 6. Hopper; 7. Auxiliary cover; 8. Deflector; 9. Rotating shaft; 10. Leakage hole; 11. Fixed ring; 12. Elastic part; 13. Telescopic part; 14. Vibration motor; 15. Fixed rod; 16. Grinding cover; 17. Through hole; 18. Elastic column; 19. Elastic connecting piece; 20. Grinding cone; 21. Sealing ring; 22. Dispersing plate; 23. Installation groove; 24. Connecting rod; 25. Clamping block; 26. Rotating bearing.

[0034] Among them, the same components in the drawings are denoted by the same reference numerals; the drawings are not drawn to actual scale. Detailed implementation manners

[0035] In view of the deficiencies in the prior art, the inventors of this case have, through long-term research and a large number of practices, been able to propose the technical solution of the present invention. The following will further explain the technical solution, its implementation process and principles, etc. in combination with the drawings in the embodiments of the present application and specific implementation cases.

[0036] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, the present invention covers any alternatives, modifications, equivalent methods and solutions made within the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] In the description of the present application, terms such as "first", "second", "third" and similar terms do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. Terms such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0038] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation of the present application. In addition, when using position terms such as both sides, outer side, upper and lower, etc., it should be understood that they are only used for convenience of understanding and description, considering that the structure may be oriented to other positions.

[0039] In the description of the present application, unless otherwise clearly defined and limited, the technical terms or scientific terms used should have the ordinary meaning understood by those with ordinary skills in the field to which the present application pertains. Terms such as "installed", "connected", "coupled" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or in contact connection or integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] The embodiments of the present invention aim to introduce and explain the structural composition of a gear processing device and the cooperation relationship between its various components. Unless otherwise specified, the dimensions, materials, manufacturing processes, etc. of the components suitable for the gear processing device in the embodiments of the present invention can be selected according to specific circumstances, and no special limitations and explanations are made here.

[0041] Furthermore, in order to enable the public to have a better understanding of the present invention, in the following detailed description of the present invention, some specific details are described in detail. Those skilled in the art can fully understand the present invention without the description of these details.

[0042] The present invention provides a sand mixer for casting processing, as Figure 1-7 shown, including a sand mixing tank 1. A feed pipe 2 is installed in the middle of the top end of the sand mixing tank 1 to facilitate the addition of various raw materials for sand mixing. A material guiding member 4 is provided at the top end inside the sand mixing tank 1. The shape of the material guiding member 4 can be frustum-shaped (larger at the bottom and smaller at the top), which facilitates the raw materials to fall through the material guiding member 4 to the screen 5, facilitating the falling of raw materials with appropriate particle sizes. The material guiding member 4 is located between the feed pipe 2 and the screen 5. The circumferential side surface of the bottom end of the sand mixing tank 1 can be equidistantly welded with supporting legs (not shown in the figure) to ensure the overall stability. A discharge pipe (not shown in the figure) can also be provided at the bottom end of the sand mixing tank 1 to facilitate the discharge of the mixed sand after sand mixing, which is convenient for collection and subsequent processing and use. A driving assembly is provided in the middle of the bottom end of the sand mixing tank 1. A screen 5 is arranged below the feed pipe 2 inside the sand mixing tank 1. A plurality of leakage holes 10 are equidistantly formed on the circumferential side surface of the screen 5. For the screen 5, it can be made of a metal mesh or a woven mesh (similar to a fishing net, which is a relatively mature technology and will not be elaborated here). For the aperture of the leakage holes 10, it is set according to the actual production needs, so as to facilitate the falling of materials with appropriate particle sizes, and the raw materials meeting the particle sizes can fall through, facilitating subsequent dispersion and mixing. A funnel 6 is arranged below the screen 5. The shape of the funnel 6 is a hollow frustum shape (larger at the top and smaller at the bottom), which facilitates the discharge of large-particle raw materials and facilitates the grinding assembly below to grind them. A grinding assembly is provided below the funnel 6 inside the sand mixing tank 1. The grinding assembly is used to grind the sand discharged from the funnel 6. The driving assembly is used to drive the grinding assembly and the dispersion assembly. A dispersion assembly is arranged on the driving assembly, and the dispersion assembly is located below the grinding assembly.

[0043] During use, various raw materials are added through the feed pipe 2, and then they are fed through the material guiding member 4. The raw materials with appropriate particle sizes fall through the leakage holes 10 on the screen 5, facilitating subsequent mixing and dispersion. The large-particle raw materials are fed through the funnel 6 to the grinding assembly for grinding, and then they are mixed and dispersed after grinding.

[0044] As shown in References 1 - 7, the drive assembly includes a motor 3 installed in the middle of the bottom end of the sand mixing tank 1. The motor 3 and the bottom of the sand mixing tank 1 can be installed and fixed through a fixing frame (not shown in the figure) to ensure the stability of the motor 3 during operation. The output end of the motor 3 is fixedly provided with a rotating shaft 9 through a coupling. The rotating shaft 9 penetrates through the sand mixing tank 1 and extends into the interior. A sealing ring 21 is provided at the intersection of the rotating shaft 9 and the sand mixing tank 1 to ensure the sealing effect. The grinding assembly includes a grinding cone 20 (in the shape of a frustum, larger at the bottom and smaller at the top) provided at the top end of the rotating shaft 9. Inside the sand mixing tank 1, there is a grinding cover 16. The grinding cover 16 is a hollow frustum shape (matched with the grinding cone 20). The inner diameter of the bottom of the funnel 6 is smaller than the inner diameter of the top of the grinding cover 16, which facilitates the large - particle - size materials in the funnel 6 to fall into the interior of the grinding cover 16. The grinding cone 20 is eccentrically arranged on the rotating shaft 9. When the rotating shaft 9 drives the grinding cone 20 to rotate, it rotates along the inner wall of the grinding cover 16, which facilitates grinding the large - particle - size materials by the cooperation of the grinding cone 20 and the grinding cover 16. The distance between the grinding part of the grinding cone 20 and the grinding cover 16 can be set according to actual grinding needs.

[0045] During use, the motor 3 operates to drive the rotating shaft 9 to rotate, driving the grinding cone 20 to work. In cooperation with the grinding cover 16, it can grind the large - particle - size raw materials falling through the funnel 6, ensuring the uniformity of the particle size distribution during subsequent mixing, not affecting the mixing effect, and ensuring the uniformity of the sand components.

[0046] In this embodiment, the dispersing assembly includes connecting rods 24 equidistantly arranged on the circumferential side of the rotating shaft 9. The number of connecting rods 24 can be two, three groups, etc. Preferably, it is three groups. A clamping block 25 is welded at the end of the connecting rod 24. The clamping block 25 is provided with a dispersing plate 22 through an installation groove 23 and can be installed and fixed by bolts or other means. It is detachable, which is convenient for installation and disassembly. The installation groove 23 is opened at one end of the clamping block 25 away from the connecting rod 24. A rotating bearing 26 is sleeved outside the rotating shaft 9. The rotating bearing 26 is located between the connecting rod 24 and the grinding cone 20. A guide cover 8 is fixedly provided on the outer ring of the bearing of the rotating bearing 26, which can facilitate guiding the ground materials for feeding, facilitating their falling onto the dispersing plate 22 for dispersion and mixing. For the guide cover 8, it can also be connected and fixed to the inner wall of the sand mixing tank 1 through connecting columns to improve the feeding effect.

[0047] During use, when the motor 3 rotates, while driving the grinding cone 20 to work, it can also drive the dispersing plate 22 to rotate. The guide cover 8 does not rotate (rotates slowly) under the action of the rotating bearing 26, which can facilitate guiding the ground raw materials for feeding, and then falling onto the dispersing plate 22, and further can disperse the ground raw materials again, facilitating the mixing operation.

[0048] In this embodiment, refer to Figure 1 、 3, as shown in Fig. 4, for the grinding cover 16, through holes 17 are equidistantly arranged on the circumferential side of the grinding cone 20. An auxiliary cover 7 is arranged outside the grinding cone 20. The central axis of the auxiliary cover 7 is on the central axis of the rotating shaft 9. Elastic columns 18 corresponding to the through holes 17 one by one are equidistantly arranged on the inner wall of the auxiliary cover 7. The material of the elastic column 18 can be elastic materials such as rubber or silica gel. On the one hand, it can conveniently push out the internal raw materials in cooperation with the through holes 17, and on the other hand, it does not affect the grinding rotation. And the circumferential side of the outer part of the auxiliary cover 7 is fixedly welded to the inner wall of the sand mixing tank 1 through a fixing rod 15. Elastic connectors 19 are equidistantly arranged on the circumferential sides of the top and bottom of the grinding cone 20. The ends of the elastic connectors 19 are fixedly connected to the inner wall of the auxiliary cover 7. For the elastic connectors 19, four groups in total, eight in number, are evenly distributed at the top and bottom, and other numbers are also possible. Preferably, the elastic connectors 19 can be springs, or rubber gaskets, etc., which can facilitate the movement during the grinding process and subsequent resetting.

[0049] During use, the motor 3 drives the grinding cone 20 to rotate and work. At this time, the grinding cone 20 contacts the grinding cover 16, generating a squeezing force towards the grinding direction on the grinding cover 16, so as to grind the raw materials. Then, the grinding cover 16 at this place approaches the auxiliary cover 7, and the elastic connectors 19 expand and contract, facilitating subsequent reset operations. During the rotating grinding process, the elastic columns 18 extend into the through holes 17 in the grinding cover 16, preventing raw materials from entering the through holes 17 during grinding and avoiding blockage. The grinding operation can also be carried out by the cooperation of the grinding cover 16 and the auxiliary cover 7, improving the grinding effect.

[0050] In this embodiment, referring to Figure 2 , 3 , as shown in Fig. 5, for the funnel 6, the outer side wall of the funnel 6 is connected to the inside of the sand mixing tank 1 through a telescopic member 13. The telescopic member 13 can be composed of a spring telescopic sleeve or other reciprocating devices, and can reciprocate the funnel 6 in the horizontal direction, just for guiding and limiting. And a vibration motor 14 (which can be other vibration devices) is also arranged on the outer side wall of the funnel 6, which can assist the funnel 6 to vibrate and discharge materials. At the same time, in cooperation with the telescopic member 13, it drives the funnel 6 to reciprocate in the horizontal direction, and can reciprocate the sieve 5, preventing materials from getting stuck in the leakage holes 10. A fixing ring 11 is arranged on the circumferential side of the top of the sieve 5. An elastic member 12 is fixedly arranged on the circumferential side of the outer part of the fixing ring 11. The elastic member 12 is connected to the inner wall of the sand mixing tank 1. Preferably, the material of the elastic member 12 can be a rubber ring made of rubber, which can facilitate auxiliary buffering when the funnel 6 reciprocates.

[0051] In use, the vibration motor 14 operates, and in cooperation with the telescopic member 13, the funnel 6 can be reciprocally vibrated in the horizontal direction, thereby assisting in the feeding of raw materials. At the same time, in cooperation with the leakage holes 10 on the strainer 5, raw materials with appropriate particle sizes are screened to avoid jamming. The elastic member 12 outside the fixed ring 11 can provide auxiliary buffering without affecting the normal feeding and screening operations.

[0052] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A sand mixer for casting processing, comprising a sand mixing tank (1), a feed pipe (2) being installed on the sand mixing tank (1), and a drive assembly being arranged under the sand mixing tank (1), characterized in that: A filter screen (5) is arranged inside the sand mixing tank (1) below the feed pipe (2), and leak holes (10) are arranged at equal intervals on the side surface of the filter screen (5). A funnel (6) is arranged below the filter screen (5). A grinding assembly is arranged inside the sand mixing tank (1) below the funnel (6), and the grinding assembly is used to grind the sand discharged from the funnel (6). A scattering assembly is arranged on the driving assembly, and the scattering assembly is located below the grinding assembly. The driving assembly is used to drive the grinding assembly and the scattering assembly.

2. A sand mixer for casting processing according to claim 1, characterized in that: The driving assembly comprises a motor (3) mounted at the middle of the bottom end of the sand mixing tank (1); a rotating shaft (9) is fixedly provided at the output end of the motor (3); the rotating shaft (9) passes through the sand mixing tank (1) and extends into the interior; a sealing ring (21) is provided at the intersection of the rotating shaft (9) and the sand mixing tank (1).

3. A sand mixer for casting processing according to claim 2, characterized in that: The grinding assembly comprises a grinding cone (20) arranged at the top of a rotating shaft (9); a grinding cover (16) is arranged inside the sand mixing tank (1); the grinding cover (16) is a hollow frustum; the inner diameter of the bottom of the funnel (6) is smaller than the inner diameter of the top of the grinding cover (16); the grinding cone (20) is eccentrically arranged on the rotating shaft (9); when the rotating shaft (9) rotates with the grinding cone (20), the grinding cone (20) rotates along the inner wall of the grinding cover (16).

4. A sand mixer for casting processing according to claim 3, characterized in that: The grinding cone (20) is provided with through holes (17) at equal intervals on the circumferential side surface. An auxiliary cover (7) is provided outside the grinding cone (20). The central axis of the auxiliary cover (7) is located on the central axis of the rotating shaft (9). Elastic columns (18) corresponding to the through holes (17) are provided at equal intervals on the inner wall of the auxiliary cover (7). The outer circumferential side surface of the auxiliary cover (7) is fixedly connected to the inner wall of the sand mixing tank (1) via a fixing rod (15).

5. A sand mixer for casting processing according to claim 4, characterized in that: Elastic connecting pieces (19) are equidistantly arranged on the circumferential side surfaces of the top and bottom of the grinding cone (20), and the ends of the elastic connecting pieces (19) are fixedly connected to the inner wall of the auxiliary cover (7).

6. A sand mixer for casting processing according to claim 2, characterized in that: The dispersing assembly comprises connecting rods (24) equidistantly arranged on the side surface of the rotating shaft (9), a clamping block (25) being fixedly provided at the end of the connecting rod (24), the clamping block (25) being provided with a dispersing plate (22) via a mounting groove (23), the mounting groove (23) being provided at an end of the clamping block (25) away from the connecting rod (24).

7. A sand mixer for casting processing according to claim 6, characterized in that: The rotating shaft (9) is provided with a rotating bearing (26) on its exterior. The rotating bearing (26) is located between the connecting rod (24) and the grinding cone (20). A deflector (8) is fixedly provided on the bearing outer ring of the rotating bearing (26).

8. A sand mixer for casting processing according to claim 1, characterized in that: A material guide (4) is provided at the top of the interior of the sand mixing tank (1), and the material guide (4) is located between the feed pipe (2) and the filter (5).

9. A sand mixer for casting processing according to claim 1, characterized in that: The outer side wall of the funnel (6) is connected to the interior of the sand mixing tank (1) via a telescopic member (13), and a vibration motor (14) is also provided on the outer side wall of the funnel (6).

10. A sand mixer for casting processing according to claim 9, characterized in that: A fixing ring (11) is provided on the peripheral side of the top of the leakage screen (5), and an elastic member (12) is fixedly provided on the outer peripheral side of the fixing ring (11), and the elastic member (12) is connected to the inner wall of the sand mixing tank (1).

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