A sand mixer agitator

Abstract

This utility model discloses a sand mixer agitator, including a transmission wheel, a mixing shaft, a mixer bearing chamber, a rotor body, and several mixing blade assemblies. The mixing blade assemblies are spirally assembled on the outer periphery of the rotor body. Each mixing blade assembly includes a mixing blade, a blade seat, and fixing bolts. The mixing blades are straight, rectangular structures made of spring steel. Two sides of the mixing blade's thickness fit into two sides of the mounting groove, and the inner side of the mixing blade's width fits into the bottom of the mounting groove. The outer side of the mixing blade's width is exposed. The bottom of the mounting groove is inclined to the radial direction of the rotor body. After being fixed in the mounting groove, the straight, rectangular mixing blades are arranged at an inclined angle to the radial direction of the rotor body, allowing the mixing blades to have more facing surfaces towards the object being mixed in the mixing direction, thereby increasing the mixing capacity and effect, and improving the overall sand mixing capacity of the sand mixer.

Description

Technical Field

[0001] This utility model relates to the technical field of sand mixing equipment, and specifically to a sand mixer agitator installed in sand mixing equipment. Background Technology

[0002] A sand mixer works by using scrapers and a mixing rotor on a milling disc to mix molding sand evenly and thoroughly, allowing the binder to effectively coat the surface of the sand particles. Modern sand mixer rotor agitators generally include a drive wheel, a mixing shaft, an agitator bearing chamber, a rotor body, and several mixing blade assemblies. The mixing shaft is rotatably mounted within the agitator bearing chamber, with both ends located outside the chamber. The drive wheel is installed at one end of the mixing shaft, and the rotor body at the other. Several mixing blade assemblies are spirally assembled around the outer circumference of the rotor body. Each mixing blade assembly includes mixing blades, blade seats, and fixing bolts. The blade seats have mounting slots, and the mixing blades are mounted into these slots using the fixing bolts. The mixing blades are arranged radially without angular contact with the rotor body. While this spiral arrangement of mixing blades achieves the desired mixing effect, further research is needed on the arrangement of the mixing blades to enhance the mixing capacity and efficiency. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a sand mixer agitator that enhances the mixing and blending capabilities of sand.

[0004] A sand mixer agitator includes a drive wheel, a mixing shaft, a mixer bearing chamber, a rotor body, and several mixing blade assemblies. The mixing shaft is rotatably mounted in the mixer bearing chamber, with both ends of the mixing shaft located outside the mixer bearing chamber. The drive wheel is installed at one end of the mixing shaft, and the rotor body is installed at the other end of the mixing shaft. Several mixing blade assemblies are spirally assembled on the outer periphery of the rotor body. Each mixing blade assembly includes a mixing blade, a blade seat, and fixing bolts. The side of the blade seat has a mounting groove for the inner end of the mixing blade to be inserted. The fixing bolts fix the mixing blade to the blade seat. The outer end of the mixing blade extends outward. The mixing blade is a straight rectangular structure made of spring steel. Two sides of the mixing blade thickness fit into two sides of the mounting groove, and the inner side of the mixing blade width fits into the bottom of the mounting groove. The outer side of the mixing blade width is exposed. The bottom of the mounting groove is inclined to the radial direction of the rotor body.

[0005] As a further option, a 1.5-2mm wear-resistant layer is formed by tungsten carbide welding on the three sides of the stirring blade facing the stirring direction.

[0006] As a further embodiment: a single-row cylindrical roller bearing and a self-aligning roller bearing are assembled between the agitator bearing chamber and the agitator shaft, with the self-aligning roller bearing closer to the drive wheel side and the single-row cylindrical roller bearing closer to the rotor body side. The self-aligning roller bearing is provided with a first sealing structure on both sides, and the single-row cylindrical roller bearing is provided with a second sealing structure on both sides. The agitator bearing housing is provided with a lubrication pipeline that leads to the first sealing structure and the second sealing structure to supply lubricating oil.

[0007] As a further embodiment: the first sealing structure includes a first bushing, a first lubrication ring, a first lubrication sleeve, and a first bearing end cap; The first bushing is fitted inside the self-aligning roller bearing. The inner end face of the first bushing abuts against the stepped surface of the inner wall of the agitator bearing chamber. The outer end face of the first bushing abuts against the outer ring of the self-aligning roller bearing. The outer peripheral surface of the first bushing fits against the inner wall of the agitator bearing chamber. The inner peripheral surface of the first bushing has a first extension that extends toward and fits against the outer peripheral surface of the agitator shaft. A first lubrication space is formed between the outer end face of the first bushing and the inner side of the self-aligning roller bearing. A first lubrication interface communicating with the first lubrication space is provided radially on the agitator bearing chamber. The first lubrication sleeve is fitted onto the stirring shaft outside the self-aligning roller bearing; the first lubrication ring is fitted onto the first lubrication sleeve; and the first bearing end cover is assembled onto the end face of the agitator bearing chamber. The inner circumference of the first lubricating ring has a second extension extending toward the outer circumferential surface of the first lubricating sleeve, the inner circumference of the first bearing end cap has a third extension extending toward the outer circumferential surface of the first lubricating sleeve, the middle part of the outer circumference of the first lubricating sleeve has an annular portion extending toward the inner circumference of the first bearing end cap, the outer side surface and outer circumferential surface of the first lubricating ring are in contact with the stepped limiting surface of the inner side surface of the first bearing end cap, and the inner side surface of the first lubricating ring abuts against the outer ring of the self-aligning roller bearing.

[0008] As a further embodiment: a first V-shaped sealing ring is provided in the first bushing to form a seal between the inner circumferential surface of the first extension and the outer circumferential surface of the stirring shaft; The outer end of the first lubricating sleeve is provided with a second V-shaped sealing ring that forms a seal between the outer circumferential surface of the first lubricating sleeve and the inner circumferential surface of the third extension.

[0009] As a further embodiment: the second sealing structure includes a second bushing, a second lubrication ring, and a second bearing end cap. The second bushing is sleeved on the stirring shaft, with its outer periphery fitting against the inner wall of the stirring bearing chamber. Its inner periphery has a fourth extension extending toward the outer periphery of the stirring shaft, with its outer end abutting against the inner side of the outer ring of the single-row cylindrical roller bearing and its inner end abutting against the stepped surface of the inner wall of the stirring bearing chamber. A second lubrication space is formed between the second bushing and the single-row cylindrical roller bearing, and a second lubrication interface communicating with the second lubrication space is provided radially on the stirring bearing chamber. The second lubricating ring is sleeved on the stirring shaft outside the single-row cylindrical roller bearing. The second bearing end cover is assembled at the end of the agitator bearing chamber. Multiple graphite packing and skeleton oil seals are provided between the inner circumference of the second bearing end cover and the outer circumference of the second lubricating ring. The skeleton oil seal is close to the outer side of the inner side of the second bearing end cover. A third V-shaped sealing ring is fitted onto the stirring shaft to form a seal between the inner circumference of the fourth extension and the outer circumference of the stirring shaft.

[0010] As a further embodiment: a connecting sleeve is fixedly mounted on one end of the stirring shaft near the rotor body, and the outer end of the second lubricating ring has a mating cavity for the inner end of the connecting sleeve to be inserted, with the inner end of the connecting sleeve abutting against the mating cavity of the second lubricating ring; A first connecting flange is fixedly installed on the outer periphery of the connecting shaft sleeve, and a second connecting flange is fixedly installed on the outer periphery of the rotor body. The first connecting flange and the second connecting flange are fixedly connected.

[0011] As a further embodiment: an assembly connecting ring is fixedly installed in the middle of the outer periphery of the agitator bearing chamber; multiple spaced support blocks are fixedly installed between one side of the assembly connecting ring and the outer periphery of the agitator bearing chamber; and an mounting block is fixed on the side of the assembly connecting ring near the drive wheel. The lubrication pipeline includes a first lubrication copper pipe and a second lubrication copper pipe. The inlet end of the first lubrication copper pipe and the inlet end of the second lubrication copper pipe are respectively equipped with a first compression fitting right angle pipe joint. The two first compression fitting right angle pipe joints are assembled on the mounting block. The first lubricating copper tube and the second lubricating copper tube are respectively equipped with second compression fitting right-angle tube connectors, and the second compression fitting right-angle tube connector on the first lubricating copper tube is connected to the first lubrication interface. The second compression fitting right-angle tube connector on the second lubrication copper tube is connected to the second lubrication interface; The second lubricating copper tube is arranged by passing through the assembly connecting ring in the middle.

[0012] By adopting the above technical solution, the straight-bladed stirring blades in this application, after being fixed in the mounting slot, are arranged at an inclined angle to the radial direction of the rotor body. Due to the inclined angle arrangement of the stirring blades, the stirring blades have more facing surface towards the object being stirred in the stirring direction, thereby increasing the stirring capacity and effect. This application further enhances the stirring capacity by adding a structural design that arranges the stirring blade body at an inclined angle, and the stirring blades made of spring steel do not need to be bent, thus improving the overall sand mixing capacity of the sand mixer.

[0013] The agitator bearing housing is fitted with single-row cylindrical roller bearings and self-aligning roller bearings between the agitator bearing housing and the agitator shaft, providing stable load-bearing capacity to the agitator shaft at high speeds. This ensures stable operation of the rotor and its agitator blades, guaranteeing the stability of the agitator's operation. Lubricating fluid is supplied to the first and second sealing structures through lubrication lines to ensure the bearings' lubrication capacity and extend their service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a side view of the assembly connecting ring in this utility model; Figure 4 This is a schematic diagram of the stirring blade structure in this utility model; Figure 5 for Figure 2 Enlarged diagram of part A in the diagram; Figure 6 for Figure 2 Enlarged schematic diagram of section B in the middle; In the attached diagram, the markings represent the following: 1. Drive wheel, 2. Stirring shaft, 3. Stirring bearing chamber, 4. Rotor body, 5. Stirring blade assembly, 6. First end cap, 7. Stirring blade, 8. Blade seat, 9. Fixing bolt; 10. Mounting slot; 11. Wear-resistant layer; 12. Single-row cylindrical roller bearing; 13. Self-aligning roller bearing; 14. First bushing; 15. First lubrication ring; 16. First lubrication sleeve; 17. First bearing end cap; 18. First extension; 19. First lubrication space. 20. First lubrication interface; 21. Second extension; 22. Third extension; 23. Annular part; 24. First V-shaped seal; 25. Second V-shaped seal; 26. Second bushing; 27. Second lubrication ring; 28. Second bearing end cap; 29. ​​Fourth extension. 30. Second lubrication space; 31. Second lubrication interface; 32. Graphite packing; 33. Skeleton oil seal; 34. Third V-ring seal; 35. Connecting bushing; 36. Butt cavity; 37. First connecting flange; 38. Second connecting flange; 39. Reinforcing plate. 40. Assembly connecting ring; 41. Support block; 42. Mounting block; 43. First lubricating copper pipe; 44. Second lubricating copper pipe; 45. First compression fitting right-angle pipe joint; 46. Second compression fitting right-angle pipe joint. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0016] Please see Figure 1-6 As shown, a sand mixer agitator includes a drive wheel 1, a mixing shaft 2, a mixer bearing chamber 3, a rotor body 4, and several mixing blade assemblies 5. The mixing shaft 2 is rotatably mounted in the mixer bearing chamber 3 and can rotate around its own axis within the mixer bearing chamber 3 under external force. Both ends of the mixing shaft 2 are located outside the mixer bearing chamber 3 and serve as connecting ends. The drive wheel 1 is installed at one end of the mixing shaft 2 and is assembled onto the mixing shaft 2 via a keyway. A first end cap 6, bolted to the end face of the mixing shaft 2, limits the rotation of the mixing shaft 2. When an external force drives the drive wheel 1 to rotate, it can drive the rotation of the mixing shaft 2. The rotor body 4 is installed at the other end of the stirring shaft 2. The rotation of the stirring shaft 2 can drive the rotor body 4 to rotate. Several stirring blade assemblies 5 are spirally assembled on the outer periphery of the rotor body 4. During the rotation of the stirring blade assembly on the rotor body 4, stirring and mixing are formed. Specifically, the stirring blade assembly 5 includes stirring blades 7, blade seats 8, and fixing bolts 9. The side of the blade seat 8 is provided with a mounting slot 10 for the inner end of the stirring blades 7 to be inserted. The fixing bolts 9 fix the stirring blades 7 to the blade seats 8. The outer end of the stirring blades 7 extends outward.

[0017] The stirring blade 7 is a straight rectangular structure made of spring steel. Two sides of the stirring blade 7's thickness fit snugly against two sides of the mounting slot 10, meaning that after the stirring blade 7 is installed in the mounting slot, it cannot swing left or right. The inner side of the stirring blade 7's width fits snugly against the bottom of the mounting slot 10. The bottom of the mounting slot 10 is flat, while the outer side of the stirring blade 7's width is exposed. After being locked with fixing bolts, the stirring blade 7 is fixedly connected to the mounting slot 10 of the blade seat 8. The bottom surface of the mounting slot 10 is arranged at an angle of approximately 100° to the radial direction of the rotor body 4. The straight stirring blade 7, after being fixed to the mounting slot 10, can also form a corresponding angled arrangement. Due to the angled arrangement of the stirring blade 7, it has more facing surface towards the object being stirred in the stirring direction, thereby increasing the stirring capacity and effect.

[0018] Most of the stirring blade groups are arranged in a spiral on the outer periphery of the rotor body 4, and the stirring blades are arranged radially along the rotor body 4 without angle. The stirring force is mainly achieved by the spiral arrangement of all stirring blade groups on the rotor body 4. Based on this, this application adds a structural design of inclined arrangement of stirring blade body, and the stirring blades 7 made of spring steel do not need to be bent, further enhancing the stirring capacity and improving the overall sand mixing capacity of the sand mixer.

[0019] In some embodiments, a 1.5-2mm wear-resistant layer 11 is formed by tungsten carbide welding on the three sides of the stirring blade 7 facing the stirring direction, so as to extend the service life of the stirring blade 7 facing the object being stirred. Corner welding is also performed at the corners of the three facing surfaces and their respective facing and non-facing surfaces to improve the wear resistance at the corners.

[0020] In some embodiments, a single-row cylindrical roller bearing 12 and a self-aligning roller bearing 13 are assembled between the agitator bearing chamber 3 and the agitator shaft 2. The self-aligning roller bearing 13 is arranged near the drive wheel 1, and the single-row cylindrical roller bearing 12 is arranged near the rotor body 4, so as to generate stable load on the agitator shaft 2 at high speed.

[0021] The self-aligning roller bearing 13 has a first sealing structure on both sides, and the single-row cylindrical roller bearing 12 has a second sealing structure on both sides. A lubrication pipeline is provided outside the agitator bearing chamber 3, leading to the first and second sealing structures and allowing lubricating oil to flow into them. By introducing lubricating fluid into the first and second sealing structures through the lubrication management system, the bearing's lubrication capability is ensured, extending its service life.

[0022] In some embodiments, the first sealing structure includes a first bushing 14, a first lubricating ring 15, a first lubricating sleeve 16, and a first bearing end cap 17. The first bushing 14 is fitted inside the self-aligning roller bearing 13, with its inner end face abutting against the stepped surface of the inner wall of the agitator bearing chamber 3 to limit the inner end of the first bushing 14. The outer end face of the first bushing 14 abuts against the outer ring of the self-aligning roller bearing 13 to lock the self-aligning roller bearing 13 in place. The outer peripheral surface of the first bushing 14 is flush with the agitator. The inner walls of the bearing chamber 3 are fitted together, so that the first bushing 14 and the inner wall of the agitator bearing chamber 3 are coaxially mounted. The inner circumference of the first bushing 14 has a first extension 18 that extends toward and fits against the outer circumferential surface of the agitator shaft 2. A first lubrication space 19 is formed between the outer end face of the first bushing 14 and the inner side of the self-aligning roller bearing 13 for storing lubricating fluid. A first lubrication port 20 is radially provided on the agitator bearing chamber 3 to communicate with the first lubrication space 19 for injecting lubricating fluid into the first lubrication space 19. The inner side of the self-aligning roller bearing 13 is sealed by the first bushing 14.

[0023] The first lubrication sleeve 16 is fitted onto the stirring shaft 2 outside the self-aligning roller bearing 13, forming a coaxial arrangement; the first lubrication ring 15 is fitted onto the first lubrication sleeve 16, and the first bearing end cover 17 is assembled to the end face of the stirrer bearing chamber 3 by screws; the inner circumference of the first lubrication ring 15 has a second extension 21 extending toward the outer circumference of the first lubrication sleeve 16, the inner circumference of the first bearing end cover 17 has a third extension 22 extending toward the outer circumference of the first lubrication sleeve 16, and the middle of the outer circumference of the first lubrication sleeve 16 has an annular portion 23 extending toward the inner circumference of the first bearing end cover 17. The second extension 21, the third extension 22, and the annular portion 23 form a labyrinth structure in the axial direction of the stirring shaft 2. The outer surface and outer circumference of the first lubrication ring 15 are in contact with the stepped limiting surface of the inner surface of the first bearing end cover 17, so as to form an effective constraint and limiting on the first lubrication ring 15 by the first bearing end cover 17; the inner surface of the first lubrication ring 15 abuts against the outer ring of the self-aligning roller bearing 13. One end of the first lubrication sleeve 16 abuts against the inner ring of the self-aligning roller bearing 13, and the other end abuts against the drive wheel 1, thereby limiting the first lubrication ring 15. The first lubrication ring 15, the first lubrication sleeve 16, and the first bearing end cap 17 form a seal on the outer side of the self-aligning roller bearing 13.

[0024] In some embodiments, a first V-shaped sealing ring 24 is provided inside the first bushing 14 to form a seal between the inner circumferential surface of the first extension 18 and the outer circumferential surface of the stirring shaft 2, and the first V-shaped sealing ring 24 is sleeved on the stirring shaft 2; a second V-shaped sealing ring 25 is sleeved at the outer end of the first lubrication sleeve 16 to form a seal between the outer circumferential surface of the first lubrication sleeve 16 and the inner circumferential surface of the third extension 22. The first V-shaped sealing ring 24 and the second V-shaped sealing ring 25 are made of fluororubber, which gives the sealing rings heat resistance, oil resistance, corrosion resistance and other properties, thus extending their service life.

[0025] In some embodiments, the second sealing structure includes a second bushing 26, a second lubrication ring 27, and a second bearing end cap 28. The second bushing 26 is sleeved on the stirring shaft 2. The outer periphery of the second bushing 26 is in contact with the stepped surface of the inner wall of the stirrer bearing chamber 3. The inner periphery has a fourth extension 29 extending toward the outer periphery of the stirring shaft 2. The outer end abuts against the inner side of the outer ring of the single-row cylindrical roller bearing 12, forming a constraint and limiting on the inner side of the single-row cylindrical roller bearing 12. The inner end abuts against the stepped surface of the inner wall of the stirrer bearing chamber 3, forming an axial limitation on the inner end of the second bushing 26. A second lubrication space 30 is formed between the second bushing 26 and the single-row cylindrical roller bearing 12 for storing lubricating fluid and lubricating the single-row cylindrical roller bearing 12. A second lubrication interface 31 communicating with the second lubrication space 30 is provided radially on the stirrer bearing chamber 3 for injecting lubricating fluid into the second lubrication space 30 from there.

[0026] The second lubricating ring 27 is fitted onto the stirring shaft 2 outside the single-row cylindrical roller bearing 12. The second bearing end cover 28 is assembled to the end of the agitator bearing chamber 3 by screws. Multiple graphite packing rings 32 and skeleton oil seals 33 are provided between the inner circumference of the second bearing end cover 28 and the outer circumference of the second lubricating ring 27. The skeleton oil seals 33 are close to the outer side of the inner side of the second bearing end cover 28 to ensure the sealing capability of the outer side of the single-row cylindrical roller bearing 12. A third V-shaped sealing ring 34 is fitted onto the stirring shaft 2 to form a seal between the inner circumference of the fourth extension 29 and the outer circumference of the stirring shaft 2. The above structure ensures the sealing performance of the single-row cylindrical roller bearing 12 installed in the agitator bearing chamber 3.

[0027] A connecting sleeve 35 is fixedly mounted on one end of the stirring shaft 2 near the rotor body 4. The outer end of the second lubricating ring 27 has a mating cavity 36 for the inner end of the connecting sleeve 35 to be inserted. The inner end of the connecting sleeve 35 abuts against the mating cavity 36 of the second lubricating ring 27. The second lubricating ring 27 abuts against the inner ring of the single-row cylindrical roller bearing 12, and the inner end of the second bearing end cap 28 abuts against the outer ring of the single-row cylindrical roller bearing 12, thereby stably assembling the single-row cylindrical roller bearing 12 in the agitator bearing chamber 3.

[0028] A first connecting flange 37 is welded and fixed to the outer periphery of the connecting bushing 35, and a second connecting flange 38 is welded and fixed to the outer periphery of the rotor body 4. The first connecting flange 37 and the second connecting flange 38 are fixedly connected by bolts, thus forming a butt joint installation between the rotor body 4 and the stirring shaft 2. A reinforcing plate 39 is welded between the outer periphery of the rotor body 4 and the side wall of the second connecting flange to enhance the strength of the connection between the rotor body 4 and the stirring shaft 2.

[0029] In some embodiments, an assembly connecting ring 40 is welded and fixedly installed in the middle of the outer periphery of the agitator bearing chamber 3, for docking and installing the entire agitator to the corresponding position; a plurality of spaced support blocks 41 are welded and fixedly installed between one side of the assembly connecting ring 40 and the outer periphery of the agitator bearing chamber 3, for enhancing the connection strength between the assembly connecting ring 40 and the agitator bearing chamber 3; an mounting block 42 is fixed on the side of the assembly connecting ring 40 near the transmission wheel 1 for docking and installing the lubrication pipeline.

[0030] The lubrication pipeline includes a first lubrication copper pipe 43 and a second lubrication copper pipe 44. The inlet end of the first lubrication copper pipe 43 and the inlet end of the second lubrication copper pipe 44 are respectively equipped with a first compression fitting right angle pipe joint 45. The two first compression fitting right angle pipe joints 45 are assembled on the mounting block, that is, the mounting block has a mounting position for the two first compression fitting right angle pipe joints 45, so as to facilitate the stable connection of the external lubrication system.

[0031] The outlet ends of the first lubricating copper tube 43 and the second lubricating copper tube 44 are respectively equipped with second compression fitting right-angle pipe joints 46. The second compression fitting right-angle pipe joint 46 on the first lubricating copper tube 43 is connected to the first lubrication interface 20, through which lubricant is injected into the first lubrication space 19; the second compression fitting right-angle pipe joint 46 on the second lubricating copper tube 44 is connected to the second lubrication interface 31, through which lubricant is injected into the second lubrication space 30; the middle part of the second lubricating copper tube 44 passes through the assembly connecting ring 40 and can be formed by two connected sections. For example, the first section runs from the mounting block to the assembly connecting ring 40, and the second section runs from the assembly connecting ring 40 to the second lubrication interface 31; in order to ensure the stability of the second lubricating copper tube 44, a through hole is opened on the assembly connecting ring 40 for the pipe joints at the end of the first section and the beginning of the second section to be installed and connected.

[0032] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present utility model used to illustrate the technical solutions of the present utility model, and are not intended to limit them, much less limit the patent scope of the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model. In addition, the direct or indirect application of the technical solutions of the present utility model to other related technical fields is similarly included within the patent protection scope of the present utility model.

Claims

1. A sand mixer agitator, comprising a drive wheel, a mixing shaft, a mixer bearing chamber, a rotor body, and a plurality of mixing blade assemblies, wherein the mixing shaft is rotatably disposed within the mixer bearing chamber, with both ends of the mixing shaft located outside the mixer bearing chamber; the drive wheel is mounted at one end of the mixing shaft; the rotor body is mounted at the other end of the mixing shaft; and a plurality of mixing blade assemblies are helically assembled on the outer periphery of the rotor body; each mixing blade assembly includes a mixing blade, a blade seat, and fixing bolts; the blade seat has a mounting groove on its side for the inner end of the mixing blade to be inserted; the fixing bolts fix the mixing blade to the blade seat; and the outer end of the mixing blade extends outward. The agitator is characterized in that... The stirring blade is a straight rectangular structure made of spring steel. The two sides of the stirring blade thickness fit into the two sides of the mounting slot, the inner side of the stirring blade width fits into the bottom of the mounting slot, and the outer side of the stirring blade width is exposed. The bottom of the mounting slot is inclined to the radial direction of the rotor body.

2. The agitator for a sand mixer as described in claim 1, characterized in that, A 1.5-2mm wear-resistant layer is formed by tungsten carbide welding on the three sides of the stirring blade facing the stirring direction.

3. The agitator for a sand mixer as described in claim 1, characterized in that, A single-row cylindrical roller bearing and a self-aligning roller bearing are assembled between the agitator bearing chamber and the agitator shaft. The self-aligning roller bearing is closer to the drive wheel side, and the single-row cylindrical roller bearing is closer to the rotor body side. The self-aligning roller bearing is provided with a first sealing structure on both sides, and the single-row cylindrical roller bearing is provided with a second sealing structure on both sides. The agitator bearing housing is provided with a lubrication pipeline that leads to the first sealing structure and the second sealing structure to supply lubricating oil.

4. The agitator for a sand mixer as described in claim 1, characterized in that, The first sealing structure includes a first bushing, a first lubrication ring, a first lubrication sleeve, and a first bearing end cap; The first bushing is fitted inside the self-aligning roller bearing. The inner end face of the first bushing abuts against the stepped surface of the inner wall of the agitator bearing chamber. The outer end face of the first bushing abuts against the outer ring of the self-aligning roller bearing. The outer peripheral surface of the first bushing fits against the inner wall of the agitator bearing chamber. The inner peripheral surface of the first bushing has a first extension that extends toward and fits against the outer peripheral surface of the agitator shaft. A first lubrication space is formed between the outer end face of the first bushing and the inner side of the self-aligning roller bearing. A first lubrication interface communicating with the first lubrication space is provided radially on the agitator bearing chamber. The first lubrication sleeve is fitted onto the stirring shaft outside the self-aligning roller bearing; the first lubrication ring is fitted onto the first lubrication sleeve; and the first bearing end cover is assembled onto the end face of the agitator bearing chamber. The inner circumference of the first lubricating ring has a second extension extending toward the outer circumferential surface of the first lubricating sleeve, the inner circumference of the first bearing end cap has a third extension extending toward the outer circumferential surface of the first lubricating sleeve, the middle part of the outer circumference of the first lubricating sleeve has an annular portion extending toward the inner circumference of the first bearing end cap, the outer side surface and outer circumferential surface of the first lubricating ring are in contact with the stepped limiting surface of the inner side surface of the first bearing end cap, and the inner side surface of the first lubricating ring abuts against the outer ring of the self-aligning roller bearing.

5. The agitator for a sand mixer as described in claim 4, characterized in that, A first V-shaped sealing ring is provided inside the first bushing to form a seal between the inner circumferential surface of the first extension and the outer circumferential surface of the stirring shaft. The outer end of the first lubricating sleeve is provided with a second V-shaped sealing ring that forms a seal between the outer circumferential surface of the first lubricating sleeve and the inner circumferential surface of the third extension.

6. The agitator for a sand mixer as described in claim 4, characterized in that, The second sealing structure includes a second bushing, a second lubrication ring, and a second bearing end cap. The second bushing is sleeved on the stirring shaft. The outer circumference of the second bushing is in contact with the inner wall of the stirring bearing chamber. The inner circumference has a fourth extension extending toward the outer circumference of the stirring shaft. The outer end abuts against the inner side of the outer ring of the single-row cylindrical roller bearing, and the inner end abuts against the stepped surface of the inner wall of the stirring bearing chamber. A second lubrication space is formed between the second bushing and the single-row cylindrical roller bearing. A second lubrication interface communicating with the second lubrication space is provided radially on the stirring bearing chamber. The second lubricating ring is sleeved on the stirring shaft outside the single-row cylindrical roller bearing. The second bearing end cover is assembled at the end of the agitator bearing chamber. Multiple graphite packing and skeleton oil seals are provided between the inner circumference of the second bearing end cover and the outer circumference of the second lubricating ring. The skeleton oil seal is close to the outer side of the inner side of the second bearing end cover. A third V-shaped sealing ring is fitted onto the stirring shaft to form a seal between the inner circumference of the fourth extension and the outer circumference of the stirring shaft.

7. The agitator for a sand mixer as described in claim 4, characterized in that, A connecting sleeve is fixedly mounted on one end of the stirring shaft near the rotor body. The outer end of the second lubricating ring has a mating cavity for the inner end of the connecting sleeve to be inserted. The inner end of the connecting sleeve abuts against the mating cavity of the second lubricating ring. A first connecting flange is fixedly installed on the outer periphery of the connecting shaft sleeve, and a second connecting flange is fixedly installed on the outer periphery of the rotor body. The first connecting flange and the second connecting flange are fixedly connected.

8. The agitator for a sand mixer as described in claim 6, characterized in that, An assembly connecting ring is fixedly installed in the middle of the outer periphery of the agitator bearing. Multiple support blocks are fixedly installed at intervals between one side of the assembly connecting ring and the outer periphery of the agitator bearing. An mounting block is fixed on the side of the assembly connecting ring near the drive wheel. The lubrication pipeline includes a first lubrication copper pipe and a second lubrication copper pipe. The inlet end of the first lubrication copper pipe and the inlet end of the second lubrication copper pipe are respectively equipped with a first compression fitting right angle pipe joint. The two first compression fitting right angle pipe joints are assembled on the mounting block. The first lubricating copper tube and the second lubricating copper tube are respectively equipped with second compression fitting right-angle tube joints. The second compression fitting right-angle tube joint on the first lubricating copper tube is connected to the first lubrication interface; the second compression fitting right-angle tube joint on the second lubricating copper tube is connected to the second lubrication interface; the middle part of the second lubricating copper tube is arranged by passing through the assembly connecting ring.

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