Sand mixing mechanism

Abstract

The application provides a sand mixing mechanism and relates to the technical field of sand mixing, which comprises a motor and a speed reducer, cooperation of which realizes internal and external reverse forced circulation mixing of sand, cooperation of a protruding sleeve, an annular groove, a profiled groove, an oil inlet pipe, an oil outlet pipe, a sealing plug and a reinforcing rib realizes uniform lubrication between the rotating sleeve and the annular sleeve, the mechanism utilizes the inner ring blade and the outer ring blade with opposite helical directions on the transmission shaft to respectively drive the inner layer sand and the outer layer sand to move in opposite directions, and after the sand is turned and flipped by the inner concave surface and the layered sheet at both ends of the stirring shell, a closed circulation flow field is formed, effectively solving the problems of uneven mixing and long time consumption caused by the same direction rotation, and significantly improving the sand mixing efficiency and uniformity.

Description

Technical Field

[0001] This invention relates to the field of molding sand mixing technology, and more specifically, to a molding sand mixing mechanism. Background Technology

[0002] In existing technologies, molding sand mixing mechanisms generally use co-rotating stirring devices (such as twin-shaft or single-shaft paddle mixers). All stirring components rotate in the same direction. This motion mode mainly relies on centrifugal force and relative sliding between materials to achieve mixing. Due to the lack of forced shearing and convection in opposite directions, the binder, additives and sand particles in the molding sand are difficult to achieve uniform distribution in a short time, and often require a long stirring cycle to barely meet the process requirements.

[0003] More seriously, the material flow field formed by the co-rotation is relatively regular and stable, which easily leads to stratification or circulation phenomena. This results in significant differences in the composition of the molding sand located at the edge and center of the mixing drum. This not only prolongs the mixing time and increases energy consumption, but also affects the strength and permeability of the subsequent mold due to local uneven composition, thus significantly reducing the efficiency of molding sand preparation and casting quality. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a molding sand mixing mechanism to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a molding sand mixing mechanism, comprising a fixedly mounted base and a mixing shell mounted on the base; further comprising a circulation mechanism, the circulation mechanism comprising two annular sleeves mounted at both ends of the mixing shell, the two annular sleeves being coaxial and symmetrically arranged, each annular sleeve having a rotating sleeve rotatably fitted inside, each rotating sleeve having an inner concave surface, and multiple layered pieces being equally spaced on the two inner concave surfaces, an intermediate sleeve being disposed at the axial center of the annular sleeves, and a transmission shaft being rotatably disposed between the two intermediate sleeves, an inner ring blade and an outer ring blade being disposed on the outer wall of the transmission shaft, the inner ring blade and the outer ring blade being nested together with the outer ring blade being on the outer layer of the inner ring blade, and a lubrication mechanism being disposed on the annular sleeves.

[0006] Preferably, multiple synchronizing rods are evenly spaced on the outer ring blade, and multiple fixing rods are evenly spaced inside the two annular sleeves, with the two ends of each synchronizing rod connected to the two fixing rods respectively.

[0007] Preferably, each of the rotating sleeves is provided with a follower sleeve at its axial center position, and the two follower sleeves are respectively fixedly connected to the transmission shaft.

[0008] Preferably, the outer and inner blades have opposite helical directions, and the inner blades are partially connected to the drive shaft.

[0009] Preferably, a motor and a reducer are fixedly mounted on the base, the motor is connected to the reducer, the extended end of the reducer is connected to the drive shaft, and a cover plate is provided at the upper end of the stirring shell.

[0010] Preferably, a control component is fixedly provided at the lower end of the stirring shell, and the communication state between the lower end of the stirring shell and the outside world can be changed through the control component.

[0011] Preferably, the lubrication mechanism includes protruding sleeves mounted on the outer walls of the two annular sleeves, the protruding sleeves having annular grooves inside, and the annular grooves communicating with the inner walls of the annular sleeves, and the rotating sleeve having multiple conforming grooves on the side away from the concave surface.

[0012] Preferably, the upper and lower ends of the two protruding sleeves are respectively connected to an oil inlet pipe and an oil outlet pipe, and multiple oil inlet pipes and oil outlet pipes are respectively threaded with sealing plugs.

[0013] Preferably, each of the annular sleeves has a plurality of reinforcing ribs evenly spaced on its outer wall, and the ends of the plurality of reinforcing ribs that are close to each other are connected to the middle sleeve.

[0014] Preferably, the plane in which the annular groove is located and the plane formed by the plurality of conformal grooves at opposite ends are the same plane.

[0015] Compared with the prior art, the present invention provides a molding sand mixing mechanism, which has the following beneficial effects: This invention utilizes the reverse spiral design of the inner and outer ring blades in the circulation mechanism to cause the inner and outer layers of molding sand to move axially in opposite directions under the drive of the transmission shaft. After turning at both ends of the mixing shell via the concave surface and being folded and thrown by the stratified blades, the sand flows back in the opposite direction, forming a forced circulation flow field that combines continuous exchange of materials between the inner and outer layers, axial conveying, and radial tumbling. This completely changes the material stratification and circulation phenomenon caused by the single flow field law in traditional co-directional mixing, enabling the binder, auxiliary materials, and sand particles in the molding sand to achieve uniform distribution in a short time, significantly shortening the mixing cycle and reducing energy consumption.

[0016] The concave end surface and layered plate structure constructed in this invention disperses and changes the direction of movement of the material by means of curved surface guidance and the cutting action of the layered plates when the molding sand is transported to both ends, preventing the material from accumulating at the ends or forming dead zones. At the same time, the rotating sleeve rotates synchronously with the transmission shaft, driving the layered plates to apply additional shearing and scattering action to the molding sand, further enhancing the mixing effect and significantly reducing the component difference between the edge and center areas of the mixing drum, thereby ensuring the consistency of strength and permeability required for subsequent casting.

[0017] The lubrication mechanism of this invention, through the interconnection and cooperation of the annular groove and the conformal groove, allows the lubricating oil to be evenly coated on the entire contact surface of the rotating sleeve and the annular sleeve, forming a complete oil film to reduce hard friction. The protruding sleeve and reinforcing rib ensure the sealing and structural strength of the lubrication chamber. The oil inlet pipe and oil outlet pipe, together with the sealing plug, enable convenient replacement of the lubricating oil, effectively extending the service life of the rotating sleeve and the annular sleeve, and ensuring the stability and reliability of the mixing mechanism in long-term continuous operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a molding sand mixing mechanism in this invention; Figure 2 This is a schematic diagram of the structure of the stirring shell in this invention; Figure 3 In this invention Figure 2 A schematic diagram of the cross-sectional structure; Figure 4 This is a cross-sectional view of the annular sleeve and the rotating sleeve in this invention. Figure 5 This is an exploded structural diagram of the rotating sleeve and outer ring blade in this invention; Figure 6 This is a schematic diagram of the rotating sleeve in this invention; Figure 7 This is a schematic diagram of the structure of the drive shaft and outer ring blade in this invention; Figure 8 This is a cross-sectional view of the stirring shell in this invention.

[0019] In the diagram: 11. Base; 12. Stirring shell; 21. Circulation mechanism; 22. Annular sleeve; 23. Rotating sleeve; 24. Concave surface; 25. Layered blade; 26. Intermediate sleeve; 27. Drive shaft; 28. Inner ring blade; 29. ​​Outer ring blade; 31. Lubrication mechanism; 32. Protruding sleeve; 33. Annular groove; 34. Conformal groove; 35. Oil inlet pipe; 36. Oil outlet pipe; 37. Sealing plug; 38. Reinforcing rib; 210. Synchronizing rod; 211. Fixed rod; 212. Follower sleeve; 213. Motor; 214. Reducer; 215. Cover plate; 216. Control components. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0023] Please see Figures 1 to 8 This embodiment provides a molding sand mixing mechanism, which aims to solve the technical problems of low mixing efficiency, long mixing time, and single material flow field of existing co-rotating mixing equipment. By integrating a circulation mechanism consisting of an annular sleeve, a rotating sleeve, an inner concave surface, layered plates, an intermediate sleeve, a drive shaft, inner ring blades, outer ring blades, a lubrication mechanism, a synchronizing rod, a fixing rod, a follower sleeve, a motor, and a reduction mechanism, the molding sand is forced to circulate and tumble under the internal and external reverse spiral push, which significantly improves the mixing uniformity and efficiency.

[0024] 1. Overall structure and initial state The molding sand mixing mechanism includes a base 11 as the installation foundation and a mixing shell 12 fixedly installed on the base 11. It also includes a circulation mechanism 21 installed on the mixing shell 12. The circulation mechanism 21 is used to drive the molding sand to form an inward and outward reverse circulation flow inside the mixing shell 12. It is composed of components such as an annular sleeve 22, a rotating sleeve 23, an inner concave surface 24, a layered plate 25, an intermediate sleeve 26, a transmission shaft 27, an inner ring blade 28, an outer ring blade 29, a lubrication mechanism 31, a synchronizing rod 210, a fixing rod 211, a follower sleeve 212, a motor 213, and a reducer 214.

[0025] 2. Composition of the core system 2.1 Circulation Mechanism 21 The circulation mechanism 21 is the core unit for achieving reverse forced mixing of molding sand. It includes two annular sleeves 22 installed at both ends of the mixing shell 12. The two annular sleeves 22 are coaxial and symmetrically arranged. A rotating sleeve 23 is rotatably fitted inside each annular sleeve 22. Each rotating sleeve 23 forms an inner concave surface 24. Multiple layered plates 25 are equally spaced on the two inner concave surfaces 24. An intermediate sleeve 26 is located at the axial position of the annular sleeves 22. A drive shaft 27 is rotatably arranged between the two intermediate sleeves 26. Inner ring blades 28 and outer ring blades 29 are respectively arranged on the outer wall of the drive shaft 27. The inner ring blades 28 and outer ring blades 29 are nested together, with the outer ring blades 29 located outside the inner ring blades 28. A lubrication mechanism 31 for lubrication is provided on the annular sleeves 22. Multiple synchronizing rods 210 are equally spaced on the outer ring blades 29. Multiple fixing rods 210 are equally spaced inside the two annular sleeves 22. 11. The two ends of the synchronizing rod 210 are respectively connected to two fixed rods 211 to ensure the rotational stability of the outer ring blade 29. Each rotating sleeve 23 is provided with a follower sleeve 212 at the axial center position. The two follower sleeves 212 are respectively fixedly connected to the transmission shaft 27 to achieve synchronous rotation with the transmission shaft 27. The spiral directions of the outer ring blade 29 and the inner ring blade 28 are opposite. The space between the inner ring blade 28 and the transmission shaft 27 is connected to facilitate the flow of molding sand. A motor 213 and a reducer 214 are fixedly installed on the base 11. The output end of the motor 213 is connected to the reducer 214. The extended end of the reducer 214 is connected to the transmission shaft 27. A cover plate 215 is provided at the upper end of the mixing shell 12. A control component 216 is fixedly installed at the lower end of the mixing shell 12. The communication state between the lower end of the mixing shell 12 and the outside world can be changed through the control component 216 to control the discharge.

[0026] 2.2 Lubrication Mechanism 31 The lubrication mechanism 31 is the core unit that ensures good lubrication between the rotating sleeve 23 and the annular sleeve 22. It includes protruding sleeves 32 installed on the outer walls of the two annular sleeves 22. The protruding sleeves 32 have annular grooves 33 inside, which are connected to the inner walls of the annular sleeves 22. The rotating sleeve 23 has multiple conforming grooves 34 on the side away from the concave surface 24. The upper and lower ends of the two protruding sleeves 32 are respectively connected to an oil inlet pipe 35 and an oil outlet pipe 36. The oil inlet pipe 35 and the oil outlet pipe 36 are respectively threaded with sealing plugs 37. Multiple reinforcing ribs 38 are equally spaced on the outer wall of each annular sleeve 22. The ends of the multiple reinforcing ribs 38 that are close to each other are connected to the intermediate sleeve 26 to enhance the structural strength. The plane where the annular groove 33 is located and the plane formed by the ends of the multiple conforming grooves 34 that are far away from each other are the same plane to ensure that the lubricating oil can be evenly distributed on the friction interface.

[0027] 3. Working process and principle of the device The working process and principle of the molding sand mixing mechanism are as follows: When mixing molding sand, first open the cover plate 215 and pour the molding sand to be mixed into the mixing shell 12. Start the motor 213 and reducer 214 to drive the drive shaft 27 to rotate. Since the drive shaft 27 is fixedly equipped with inner ring blades 28 and outer ring blades 29 with opposite spiral directions, the inner ring blades 28 are close to the drive shaft 27 and the outer ring blades 29 are located on the outer layer. When the drive shaft 27 rotates, the inner ring blades 28 push the inner layer of molding sand to one side, while the outer ring blades 29 push the outer layer of molding sand to the opposite direction, thereby causing relative motion between the inner and outer layers of molding sand. The molding sand is transported to both ends of the mixing shell 12. In the annular sleeve 22 area, after entering the concave surface 24, the molding sand is turned and guided by the layered blades 25. The molding sand turns along the curved surface of the concave surface 24 and is transported to the other side. Then it is pushed back by the inner ring blades 28 or outer ring blades 29 on the opposite side, thus forming a closed circulation flow. The molding sand continuously undergoes internal and external exchange, axial transport and radial tumbling inside the mixing shell 12, which significantly improves the mixing efficiency. At the same time, the drive shaft 27 drives the rotating sleeve 23 to rotate inside the annular sleeve 22 through the follower sleeve 212. The layered blades 25 further disperse and mix the materials to prevent the molding sand from accumulating at the end. After mixing is completed, the discharge port is opened by the control component 216 to discharge the finished product.

[0028] During the relative rotation of the rotating sleeve 23 and the annular sleeve 22, in order to ensure the lubrication effect, the operator injects lubricating oil into the annular groove 33 inside the protruding sleeve 32 through the oil inlet pipe 35. The lubricating oil flows along the annular groove 33 and enters the conformal groove 34 on the rotating sleeve 23. As the rotating sleeve 23 rotates, it is evenly coated on the contact surface of the annular sleeve 22 and the rotating sleeve 23 to form a complete oil film to reduce friction. After a period of use, the sealing plug 37 at the lower end is opened, and the waste lubricating oil is discharged through the oil outlet pipe 36, and then new oil can be injected.

[0029] The control component 216 is located at the lower end of the mixing shell 12. The control component 216 includes a discharge pipe connected to the lower end of the mixing shell 12, a slide plate inserted into the discharge pipe, and a handle located at the outer end of the slide plate. During the mixing process, the slide plate closes the discharge pipe. After the mixing is completed, the slide plate is pulled by the handle to connect the lower end of the mixing shell 12 with the outside and discharge the molding sand.

[0030] Working principle summary: The present invention uses the reverse spiral push of the inner ring blade 28 and the outer ring blade 29 in the circulation mechanism 21 to make the molding sand form a forced circulation flow field with relative movement between the inner and outer layers in the mixing shell 12. At the same time, the concave surface 24 and the layered plate 25 at the end realize the turning and tumbling of the molding sand, which effectively solves the problems of uneven mixing and long time consumption in the same direction of stirring. Example

[0031] In another optional embodiment, the helix angles of the inner ring blade 28 and the outer ring blade 29 can be optimized according to the viscosity and particle size of the molding sand. The number and spacing of the layered blades 25 can be set to be adjustable to adapt to different batches of molding sand. The oil inlet pipe 35 of the lubrication mechanism 31 can be connected to an automatic lubrication pump to achieve timed and quantitative oil supply. Wear-resistant liners can also be provided on the inner wall of the mixing shell 12 to extend the equipment life. A discharge valve can be added at the control component 216 to achieve automatic discharge.

[0032] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molding sand mixing mechanism, comprising a fixedly disposed base (11) and a mixing shell (12) mounted on the base (11); characterized in that: It also includes a circulation mechanism (21), which includes two annular sleeves (22) installed at both ends of the stirring shell (12). The two annular sleeves (22) are coaxial and symmetrically arranged. A rotating sleeve (23) is rotatably fitted inside each annular sleeve (22). An inner concave surface (24) is formed inside each rotating sleeve (23). Multiple layered pieces (25) are equally spaced on the two inner concave surfaces (24). An intermediate sleeve (26) is arranged at the axial position of the annular sleeve (22). A transmission shaft (27) is rotatably arranged between the two intermediate sleeves (26). An inner ring blade (28) and an outer ring blade (29) are respectively arranged on the outer wall of the transmission shaft (27). The inner ring blade (28) and the outer ring blade (29) are sleeved together and the outer ring blade (29) is located outside the inner ring blade (28). A lubrication mechanism (31) is arranged on the annular sleeve (22).

2. The molding sand mixing mechanism according to claim 1, characterized in that: Multiple synchronizing rods (210) are evenly spaced on the outer ring leaf (29), and multiple fixing rods (211) are evenly spaced in the two annular sleeves (22), with the two ends of the synchronizing rods (210) respectively connected to the two fixing rods (211).

3. The molding sand mixing mechanism according to claim 1, characterized in that: Each of the rotating sleeves (23) has a follower sleeve (212) at its axial center position, and the two follower sleeves (212) are respectively fixedly connected to the transmission shaft (27).

4. The molding sand mixing mechanism according to claim 1, characterized in that: The outer ring blade (29) and the inner ring blade (28) have opposite spiral directions, and the inner ring blade (28) and the drive shaft (27) are partially connected.

5. A molding sand mixing mechanism according to claim 1, characterized in that: A motor (213) and a reducer (214) are fixedly installed on the base (11). The motor (213) is connected to the reducer (214). The extended end of the reducer (214) is connected to the drive shaft (27). A cover plate (215) is provided on the upper end of the stirring shell (12).

6. The molding sand mixing mechanism according to claim 1, characterized in that: A control component (216) is fixedly provided at the lower end of the stirring shell (12), and the connection state between the lower end of the stirring shell (12) and the outside world can be changed through the control component (216).

7. A molding sand mixing mechanism according to claim 1, characterized in that: The lubrication mechanism (31) includes a protruding sleeve (32) installed on the outer wall of the two annular sleeves (22). The protruding sleeve (32) has an annular groove (33) inside, and the annular groove (33) communicates with the inner wall of the annular sleeve (22). The rotating sleeve (23) has multiple conforming grooves (34) on the side away from the concave surface (24).

8. A molding sand mixing mechanism according to claim 7, characterized in that: The upper and lower ends of the two protruding sleeves (32) are respectively connected to an oil inlet pipe (35) and an oil outlet pipe (36), and multiple oil inlet pipes (35) and oil outlet pipes (36) are respectively threaded with sealing plugs (37).

9. A molding sand mixing mechanism according to claim 1, characterized in that: Each of the annular sleeves (22) has a plurality of reinforcing ribs (38) evenly spaced on its outer wall, and one end of each of the reinforcing ribs (38) is connected to the middle sleeve (26) at a distance from each other.

10. A molding sand mixing mechanism according to claim 7, characterized in that: The plane where the annular groove (33) is located and the plane formed by the multiple conformal grooves (34) being far apart from each other are the same plane.

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