Sand mixing device and sand mixing method
Through the combined design of the barrel assembly, the first stirring mechanism, the upper and lower rolling layer and the filtering mechanism, the problem of insufficient three-dimensional mixing capacity of the sand mixing device in continuous production is solved, and the uniform combination of the raw sand and the auxiliary materials and the efficient mixing of the molded sand are achieved.
Patent Information
- Application Number
- CN202510528614.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2025-07-11
AI Technical Summary
The existing sand mixing devices have insufficient three-dimensional mixing capacity in continuous production, resulting in problems such as inter-layer grading, enrichment of auxiliary materials and degradation of sand fluidity.
Using a combined design of the barrel assembly, the first stirring mechanism, the upper and lower rolling layer and the filtering mechanism, multi-stage mixing and screening are achieved through the synergy of spoiler, turbine stirring blade, upper and lower milling tray and horizontal reciprocating screening.
It significantly improves the sand mixing efficiency, ensures the uniform combination of the raw sand and auxiliary materials, improves the fluidity and breathability of the molded sand, and solves the interlayer grading problem of traditional equipment.
Smart Images
Figure CN120286638A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of sand mixing equipment, and particularly to a sand mixing device and a sand mixing method. Background Art
[0002] With the development of technologies in the casting field, a sand mold preparation technology centered on uniform mixing of materials has emerged. This technology enables the full combination of raw sand and auxiliary materials through mechanical action, ensuring that the sand grains are uniformly coated with binders, water and other additives on the surface to form loose and non-agglomerated molding sand to meet the requirements of the casting process.
[0003] In related technologies, various sand mixing devices mainly achieve material mixing through specific movement forms of mechanical components: roller-type equipment relies on the rolling action generated by the rotation and revolution of the roller to break the material agglomeration, blade-type equipment promotes homogenization by forming axial / radial material flow through the rotation of the blades, and rotor-type equipment realizes the composite effect of rubbing and diffusion through the coordinated action of the rotor and the scraper. These treatment methods can meet the basic mixing requirements in specific scenarios, but there are still significant limitations in continuous production.
[0004] The above sand mixing technology systems generally have a common defect of insufficient three-dimensional mixing ability: the single-direction mechanical force causes a grading phenomenon between material layers, with auxiliary materials concentrated in the upper layer and sand grains exposed in the lower layer, forming a non-uniform coating structure; at the same time, the rolling action is overly concentrated in local areas, easily generating flaky agglomerates, ultimately resulting in a decrease in the fluidity of the molding sand, deterioration of the air permeability, and low overall sand mixing efficiency. Summary of the Invention
[0005] Based on this, it is necessary to provide a sand mixing device and a sand mixing method for the above problems, so as to enable the full combination of raw sand and auxiliary materials and high sand mixing efficiency.
[0006] A sand mixing device includes:
[0007] A barrel body assembly, including a sand mixing barrel main body, at least one injection port provided at the top of the sand mixing barrel main body and at least one discharge port provided at the bottom;
[0008] A first stirring mechanism, passing through the top of the barrel body assembly and extending into the interior, including a first rotating shaft and a second rotating shaft. A first gear is fixed on the first rotating shaft and meshes with a second gear on the second rotating shaft to drive the second rotating shaft to rotate; a plurality of spoiler plates are longitudinally arranged in a staggered manner on the first rotating shaft and the second rotating shaft, and a shear hole is opened on each spoiler plate; the bottoms of the first rotating shaft and the second rotating shaft are both connected with rotating secondary shafts, and turbine stirring blades are circumferentially arranged on the rotating secondary shafts. An upper grinding disc is fixed at the bottom of the rotating secondary shaft, and the upper grinding disc is arranged in an upper rolling layer;
[0009] An upper rolling layer, located at the bottom of the first stirring mechanism;
[0010] The lower rolling layer is located below the upper rolling layer. The lower rolling layer includes a lower grinding disc disposed opposite to the upper grinding disc. A first through hole and a second through hole are respectively formed on the upper grinding disc and the lower grinding disc.
[0011] The second stirring mechanism is located below the lower rolling layer;
[0012] The filtering mechanism is arranged below the second stirring mechanism. The filtering mechanism reciprocates in the horizontal direction for filtering and screening the materials.
[0013] In one embodiment, the filtering mechanism includes a filtering drive motor. The output end of the filtering drive motor is connected to a rotating disc. A plurality of amplitude adjustment holes are sequentially arranged on the rotating disc along the radial length direction of the disc body. One of the amplitude adjustment holes is connected to a connecting rod, and the other end of the connecting rod is connected to a filtering screen; the other end of the filtering screen is connected to the second protection assembly through a spring.
[0014] In one embodiment, the filtering screen includes a screen body. A plurality of screen holes are evenly distributed on the screen body; the two sides of the screen body are respectively a first side plate and a second side plate; the first side plate is hinged to the connecting rod, and the second side plate is fixedly connected to the spring.
[0015] In one embodiment, the second protection assembly is fixed on the outer side wall of the barrel assembly, and the second protection assembly is a hollow shell structure.
[0016] In one embodiment, the second stirring mechanism is a spiral stirring structure, including a spiral rotating shaft connected to the output end of a stirring motor, and spiral stirring blades fixed on the spiral rotating shaft.
[0017] In one embodiment, inclined guide plates are arranged on both sides of the lower rolling layer for guiding the materials located between the upper rolling layer and the lower rolling layer to converge towards the upper grinding disc and the lower grinding disc.
[0018] On the other hand, the present application also provides a sand mixing method using the above sand mixing device, including the following processes:
[0019] Inject the raw sand and auxiliary materials into the main body of the sand mixing barrel through the injection port;
[0020] Drive the spoiler of the first stirring mechanism to rotate, and shear and mix the materials through the shear holes; meanwhile, the rotating secondary shaft rotates synchronously, and the turbine stirring blades strengthen the shear mixing effect on the materials;
[0021] The materials flow into the space between the upper rolling layer and the lower rolling layer through the first through hole on the upper grinding disc;
[0022] The upper rolling layer and the lower rolling layer apply a rolling effect on the materials;
[0023] The logistics flows out from the second through-hole on the lower grinding disc and enters the second stirring mechanism;
[0024] The spiral stirring blades of the second stirring mechanism further mix the materials;
[0025] After the mixed materials are horizontally reciprocatingly screened by the filtering mechanism, they are discharged through the discharge port.
[0026] In one embodiment, the first stirring mechanism includes a first rotating shaft and a second rotating shaft. The first gear on the first rotating shaft meshes with the second gear on the second rotating shaft to achieve synchronous rotation in the same direction between the first rotating shaft and the second rotating shaft; by presetting the transmission ratio between the first gear and the second gear, the rotation speeds of the first rotating shaft and the second rotating shaft are different.
[0027] In one embodiment, the rolling process of the upper rolling layer and the lower rolling layer includes: the materials enter between the upper rolling layer and the lower rolling layer through the first through-hole and are guided by the guide plate into the gap between the upper grinding disc and the lower grinding disc; along with the rotational movement of the first rotating shaft and the second rotating shaft, the upper grinding disc at the bottom of the rotating pair shaft is synchronously driven to rotate, and when the upper grinding disc rotates, it cooperates with the lower grinding disc to roll the materials.
[0028] In one embodiment, the screening process of the filtering mechanism includes: the filtering drive motor drives the rotating disc to rotate, and drives the filtering screen to horizontally reciprocate through the connecting rod; the connecting rod is connected to the amplitude adjustment holes at different positions on the rotating disc to achieve the control of the horizontal displacement amplitude of the filtering screen.
[0029] For the above sand mixing device and sand mixing method, the first stirring mechanism realizes the preliminary shearing and perturbation of the materials through the spoiler plate and the shear holes, and the turbine stirring blades further disperse the materials; the upper grinding disc and the lower grinding disc of the upper and lower rolling layers guide the materials to be rolled through the through-holes and the guide plate, avoiding the agglomeration problem caused by local over-rolling;
[0030] This application also has the following advantages:
[0031] (1) The second stirring mechanism of this application is set as a horizontal spiral stirring structure to enhance the horizontal mixing ability; the filtering mechanism removes lumps through horizontal reciprocating screening to ensure the uniformity and fluidity of the final molding sand; through the coordinated cooperation of the first stirring mechanism, the second stirring mechanism and the filtering mechanism, the multi-stage treatment significantly improves the three-dimensional mixing ability and solves the problem of interlayer grading caused by the single-direction action of traditional equipment;
[0032] (2) The spoiler on the rotating shaft of this application forms a vortex when rotating, and the local high pressure difference generated by the shear holes further breaks the material agglomeration. Supplementary to the circumferential agitation of the turbine stirring blades, it effectively improves the coating uniformity of the binder and sand grains;
[0033] (3) The first through holes and the second through holes of the upper and lower rolling layers of this application form a material flow channel, which, in cooperation with the inclined guide plate, enables the material to be evenly dispersed during the rolling process, avoiding the enrichment of auxiliary materials or the exposure of sand grains;
[0034] (4) The filtering mechanism of this application can dynamically adjust the amplitude of the reciprocating movement of the screen through the cooperation of the amplitude adjustment holes and the connecting rod to adapt to the screening requirements of materials with different particle sizes; in addition, one end of the screen is connected to the protection assembly through a spring, reducing the impact of vibration on the stability of the equipment and prolonging the service life of the screen. Description of the Drawings
[0035] Figure 1 It is a schematic diagram of the overall structural framework of this application.
[0036] Figure 2 It is a schematic diagram of the transmission structure of this application.
[0037] Figure 3 It is a schematic diagram of the structure of the second rolling layer in this application.
[0038] Figure 4 It is a schematic diagram of the structure of the filtering mechanism of this application.
[0039] Among them: 100, barrel assembly; 200, first protection assembly; 300, first stirring mechanism; 400, upper rolling layer; 500, lower rolling layer; 600, second stirring mechanism; 700, filtering mechanism; 800, second protection assembly;
[0040] 110, main body of the sand mixing barrel; 120, injection port; 130, discharge port;
[0041] 210, first protection housing; 220, first sleeve;
[0042] 310, first rotating shaft; 320, first gear; 330, spoiler; 340, shear hole; 350, second rotating shaft; 360, second gear; 370, rotating secondary shaft; 380, turbine stirring blade; 390, upper rolling disc;
[0043] 391, main body of the upper rolling disc; 392, first through hole;
[0044] 410, upper rolling assembly plate; 420, second sleeve;
[0045] 510, lower rolling assembly plate; 520, guide plate; 530, lower rolling disc; 540, second through hole; 550, third sleeve;
[0046] 710. Filter drive motor; 720. Rotating disk; 730. Amplitude adjustment hole; 740. Connecting rod; 750. Filter screen; 760. Spring;
[0047] 751. First side plate; 752. Screen main body; 753. Screen holes; 754. Second side plate. Detailed implementation mode
[0048] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation mode of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0049] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are 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. Therefore, it should not be construed as a limitation to the present application.
[0050] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0051] In the present application, unless otherwise clearly specified and limited, if terms such as "installation", "connection", "connection", "fixation", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. 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.
[0052] In this application, unless otherwise clearly specified and defined, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the horizontal height of the first feature is less than that of the second feature.
[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.
[0054] Refer to Figure 1 , Figure 1 FIG. shows a schematic structural principle diagram of a sand mixing device in an embodiment of the present application. The sand mixing device provided in an embodiment of the present application includes a barrel assembly 100, a first protection assembly 200, a first stirring mechanism 300, an upper rolling layer 400, a lower rolling layer 500, a second stirring mechanism 600, a filtering mechanism 700 and a second protection assembly 800 to achieve efficient mixing and screening of raw sand and auxiliary materials.
[0055] In some embodiments, the barrel assembly 100 includes a sand mixing barrel main body 110, at least one injection port 120 is provided at the top thereof for injecting raw sand and auxiliary materials; at least one discharge port 130 is provided at the bottom for discharging the mixed molding sand.
[0056] Furthermore, the sand mixing barrel main body 110 is a vertical cylindrical structure, providing a closed space for material mixing.
[0057] In some embodiments, the first protection assembly 200 includes a first protection housing 210 and a first sleeve 220. The first sleeve 220 is fixed on the first protection housing 210 and is used for assembling the second rotating shaft 350 to ensure the stability of the transmission structure.
[0058] Please refer to Figure 2, in some embodiments, the first stirring mechanism 300 penetrates through the top of the barrel assembly 100 and extends into the interior, including a first rotating shaft 310 and a second rotating shaft 350. A first gear 320 is fixed on the first rotating shaft 310, and a second gear 360 is fixed on the second rotating shaft 350. Through the meshing of the first gear 320 and the second gear 360, the rotational movement of the first rotating shaft 310 drives the second rotating shaft 350 to rotate synchronously in the opposite direction.
[0059] Further, a plurality of spoiler plates 330 are longitudinally arranged in a staggered manner on the first rotating shaft 310 and the second rotating shaft 350, and at least one shear hole 340 is formed in each spoiler plate 330. When the rotating shaft rotates, the spoiler plates 330 agitate the material, and the shear holes 340 generate a local high pressure difference to shear and break the material agglomerates.
[0060] Further, the bottoms of the first rotating shaft 310 and the second rotating shaft 350 are respectively connected to a rotating sub-shaft 370. A turbine stirring blade 380 is circumferentially fixed on the rotating sub-shaft 370, and when it rotates, a circumferential eddy current is formed to further enhance the shear mixing effect of the material.
[0061] Still further, an upper grinding disc 390 is fixed at the bottom of the rotating sub-shaft 370. It is assembled in the upper grinding assembly plate 410 through a second sleeve 420. At least one first through hole 392 is formed in the upper grinding disc body 391 for the material to pass through and enter the gap between the upper grinding layer 400 and the lower grinding layer 500.
[0062] In some embodiments, the upper grinding disc 390 is located in the upper grinding layer 400. When it rotates, it cooperates with the lower grinding disc 530 of the lower grinding layer 500 to roll the material. The first through hole 392 guides the material to be evenly dispersed into the rolling area to avoid local accumulation.
[0063] Please refer to Figure 3 , in some embodiments, the lower grinding disc 530 is assembled on the lower grinding assembly plate 510 through a third sleeve 550, and its position is opposite to that of the upper grinding disc 390 up and down. A second through hole 540 is formed in the lower grinding disc body 530 for the rolled material to flow out to the second stirring mechanism 600.
[0064] Further, guide plates 520 are inclined on both sides of the lower grinding assembly plate 510 to guide the material flow to converge into the gap between the upper grinding disc 390 and the lower grinding disc 530 to ensure the rolling uniformity.
[0065] In some embodiments, the second stirring mechanism 600 is located below the lower grinding layer 500 and adopts a spiral stirring structure, including a spiral rotating shaft connected to a stirring motor and spiral stirring blades. The spiral blades push the material to flow axially to enhance the mixing ability in the horizontal direction.
[0066] Please refer to Figure 4, in some embodiments, the filtering mechanism 700 is disposed below the second stirring mechanism 600, and includes a filtering drive motor 710, a rotating disk 720, a connecting rod 740, a filtering screen 750 and a spring 760;
[0067] Among them, the filtering drive motor 710 drives the rotating disk 720 to rotate, connects to the amplitude adjustment hole 730 through the connecting rod 740, and drives the filtering screen 750 to reciprocate horizontally. By selecting the amplitude adjustment holes 730 at different positions, the reciprocating amplitude of the screen can be adjusted to adapt to the screening requirements of materials with different particle sizes;
[0068] Further, the screen holes 753 are evenly distributed on the screen body 752 of the filtering screen 750. The two sides are respectively hinged to the connecting rod 740 through the first side plates 751, and the second side plates 754 are connected to the second protection assembly 800 through the springs 760. The springs 760 absorb vibration energy and reduce the impact of equipment vibration on the service life of the screen.
[0069] In actual work, the sand mixing method of the present application includes the following processes:
[0070] Material injection and preliminary mixing:
[0071] The raw sand and auxiliary materials are injected into the main body 110 of the sand mixing barrel through the injection port 120. The first stirring mechanism 300 is started, the first rotating shaft 310 and the second rotating shaft 350 rotate in opposite directions, the spoiler 330 disturbs the materials and shears and breaks the lumps through the shear holes 340. The turbine stirring blades 380 further disperse the materials to form a uniform mixture;
[0072] Rolling treatment:
[0073] The materials enter between the upper rolling layer 400 and the lower rolling layer 500 through the first through hole 392. The upper grinding disc 390 and the lower grinding disc 530 rotate relatively, and cooperate with the guidance of the guide plate 520 to uniformly roll the materials to avoid stratification of the auxiliary materials or local over-rolling;
[0074] Secondary mixing and screening:
[0075] The rolled materials enter the second stirring mechanism 600 through the second through hole 540, and the spiral stirring blades strengthen the horizontal mixing. The mixed materials fall onto the filtering screen 750, and the unbroken lumps are removed through horizontal reciprocating screening. Finally, the uniform molding sand is discharged through the discharge port 130.
[0076] In summary, the spoiler 330 of the first stirring mechanism 300 of the present application and the turbine stirring blade 380 achieve shear mixing in the vertical direction, and the spiral structure of the second stirring mechanism 600 enhances horizontal mixing. Coupled with the rolling effects of the rolling layer 400 and the lower rolling layer 500, the problem of interlayer classification of traditional equipment is eliminated. In addition, the filtering mechanism 700 flexibly adjusts the screen stroke through the amplitude adjustment holes 730 to adapt to the particle sizes of different materials. The cooperation between the spring 760 and the second protection assembly 800 reduces the vibration impact on the screen body 752 during the screening process and extends the service life.
[0077] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0078] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.
Claims
1. A sand mixing device, characterized in that, Including: A barrel body assembly, including a sand mixing barrel main body, at least one injection port provided at the top of the sand mixing barrel main body, and at least one discharge port at the bottom; A first stirring mechanism, passing through the top of the barrel body assembly and extending into the interior, including a first rotating shaft and a second rotating shaft. A first gear is fixed on the first rotating shaft and meshes with a second gear on the second rotating shaft to drive the second rotating shaft to rotate; A plurality of spoiler plates are arranged longitudinally and staggeredly on the first rotating shaft and the second rotating shaft, and shear holes are provided on each spoiler plate; Rotating sub-shafts are connected to the bottoms of the first rotating shaft and the second rotating shaft, and turbine stirring blades are arranged circumferentially on the rotating sub-shafts. An upper grinding disc is fixed at the bottom of the rotating sub-shaft, and the upper grinding disc is arranged in the upper rolling layer; The upper rolling layer is located at the bottom of the first stirring mechanism; The lower rolling layer is located below the upper rolling layer. The lower rolling layer includes a lower grinding disc arranged opposite to the upper grinding disc. First through holes and second through holes are respectively provided on the upper grinding disc and the lower grinding disc; The second stirring mechanism is located below the lower rolling layer; A filtering mechanism is arranged below the second stirring mechanism. The filtering mechanism reciprocates horizontally for filtering and screening materials.
2. The sand mixing device according to claim 1, characterized in that, The filtering mechanism includes a filtering drive motor. The output end of the filtering drive motor is connected to a rotating disc. A plurality of amplitude adjustment holes are arranged in sequence along the radius length direction of the disc body on the rotating disc. One of the amplitude adjustment holes is connected to a connecting rod, and the other end of the connecting rod is connected to a filtering screen; The other end of the filtering screen is connected to a second protection assembly through a spring.
3. The sand mixing device according to claim 2, characterized in that The filtering screen includes a screen body, and a plurality of screen holes are evenly distributed on the screen body; The two sides of the screen body are a first side plate and a second side plate respectively; The first side plate is hinged to the connecting rod, and the second side plate is fixedly connected to the spring.
4. The sand mixing device according to claim 2, characterized in that, The second protection assembly is fixed on the outer side wall of the barrel body assembly, and the second protection assembly is a hollow shell structure.
5. The sand mixing device according to claim 1, characterized in that, The second stirring mechanism is a spiral stirring structure, including a spiral rotating shaft connected to the output end of a stirring motor, and spiral stirring blades fixed on the spiral rotating shaft.
6. The sand mixing device according to claim 1, wherein Inclined guide plates are arranged on both sides of the lower rolling layer for guiding the materials located between the upper rolling layer and the lower rolling layer to converge towards the upper grinding disc and the lower grinding disc.
7. A sand mixing method, using the sand mixing device described in any one of claims 1-6, characterized in that, Including the following processes: Inject the raw sand and auxiliary materials into the sand mixing barrel main body through the injection port; Drive the spoiler plates of the first stirring mechanism to rotate, and shear and mix the materials through the shear holes; The rotating sub-shaft rotates synchronously, and the turbine stirring blades strengthen the shear mixing effect on the materials; The materials flow into the space between the upper rolling layer and the lower rolling layer through the first through holes on the upper grinding disc; The upper rolling layer and the lower rolling layer exert a rolling effect on the materials; The materials flow out through the second through holes on the lower grinding disc and enter the second stirring mechanism; Further mix the materials through the spiral stirring blades of the second stirring mechanism; The mixed materials are horizontally reciprocally screened by the filtering mechanism and then discharged through the discharge port.
8. The sand mixing method according to claim 7, wherein, The first stirring mechanism includes a first rotating shaft and a second rotating shaft. The first rotating shaft and the second rotating shaft rotate in the same direction synchronously through the meshing of the first gear on the first rotating shaft and the second gear on the second rotating shaft; By presetting the transmission ratio between the first gear and the second gear, the rotational speeds of the first rotating shaft and the second rotating shaft are made different.
9. The sand mixing method according to claim 7, characterized in that The rolling process of the upper rolling layer and the lower rolling layer includes: the material enters between the upper rolling layer and the lower rolling layer through the first through-hole, and is guided by the guide plate into the gap between the upper rolling disc and the lower rolling disc; With the rotational movements of the first rotating shaft and the second rotating shaft, the upper rolling disc at the bottom of the rotating pair shaft is synchronously driven to rotate. When the upper rolling disc rotates, it cooperates with the lower rolling disc to roll the material.
10. The sand mixing method according to claim 7, characterized in that, The screening process of the filtering mechanism includes: the filtering drive motor drives the rotating disc to rotate, and drives the filtering screen to move horizontally back and forth through the connecting rod; The connecting rod is connected to the amplitude adjustment holes at different positions on the rotating disc to achieve the control of the displacement amplitude of the filtering screen in the horizontal direction.