Main shaft mounting and lubricating mechanism and sand making machine with wear-resistant rotor

Abstract

The invention discloses a main shaft mounting and lubricating mechanism and a sand making machine with a wear-resistant rotor, and relates to the technical field of sand making machines, and a rotor bearing seat is detachably and fixedly connected with a sand making machine base through an inner and outer seat structural design. And a self-lubricating system in the rotor bearing seat can reduce the probability of abrasion of the main shaft bearing. The anti-attrition structure design in the rotor and the shell reduces the consumption of wear-resistant parts in the rotor and the shell. The use and maintenance cost of the sand making machine is reduced; the first positioning area, the second positioning area and the third positioning area enable the outer base to be stably arranged on the outer side of the inner base in a sleeving mode, the rigidity and stability of the main shaft and the inner base are improved, the bearing load of the main shaft is shared, radial jumping and axial jumping of the main shaft and the inner base are overcome, fatigue damage of the main shaft is reduced, and then the maintenance cost of the sand making machine is reduced. And the first expansion sleeve is taken down, and the inner seat is lifted upwards, so that the inner seat can be taken out for maintenance, the dismounting difficulty of the main shaft and the bearing is reduced, and the sand making machine is more convenient to maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sand making machine, in particular to a main shaft installation and lubrication mechanism and a sand making machine with wear-resistant rotor. BACKGROUND

[0002] The main shaft in the sand making machine is used to transmit power to the rotating disc to drive the rotating disc to rotate at high speed, thereby realizing the crushing operation such as sand making.

[0003] However, the main shaft in the prior art is prone to damage, resulting in high maintenance cost of the sand making machine. For example, in the assembly structure of the main shaft fixing sleeve and the rack disclosed in the patent document CN203030368U, the upper support ring and the inner seat plate are respectively welded to the upper part and the lower part of the center of the sand making machine rack, the upper flange of the main shaft fixing sleeve is connected with the upper support ring through bolts, the lower part of the inner seat plate is welded with a lower support ring, the lower outer sleeve is expanded and tightened with the lower support ring, and the lower support ring is expanded and tightened with the lower outer sleeve. Figure 1 It can be seen that the lower outer sleeve and the lower support ring are fixed together by bolts. It should be noted that because the machining of the upper flange and the lower support ring both have a tolerance range, when the upper flange is aligned with the upper support ring, the lower support ring is difficult to align with the lower outer sleeve. Therefore, when the lower support ring and the lower outer sleeve are pulled by the bolts, the lower support ring, the lower outer sleeve and the main shaft fixing sleeve will be subjected to additional expansion force exerted by the bolts, and are prone to be damaged under the action of the additional expansion force exerted by the bolts, resulting in high maintenance cost of the main shaft fixing sleeve of the patent document CN203030368U and the sand making machine using the main shaft fixing sleeve of the patent document CN203030368U.

[0004] Therefore, how to reduce the damage of the main shaft and reduce the maintenance cost of the sand making machine has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a main shaft installation and lubrication mechanism and a sand making machine with wear-resistant rotor to reduce the damage of the main shaft and reduce the maintenance cost of the sand making machine.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions. The present application provides a main shaft installation and lubrication mechanism, which comprises a main shaft, the first end of the main shaft is located in a sand making machine, the second end of the main shaft extends out of the sand making machine, and the region outside the first end of the main shaft and the second end of the main shaft is sequentially sleeved with an inner seat and an outer seat from inside to outside. Among them, a plurality of bearings are provided between the main shaft and the inner seat, which are sleeved on the main shaft and rotatably disposed on the inner side of the inner seat. The main shaft and the bearings are interference fit. The inner wall of the inner seat is provided with a bearing area for supporting the bearings. The bottom end of the inner seat is detachably and fixedly connected to the bottom end of the sand making machine. The outer side of the inner seat is provided with a first positioning area, a second positioning area and a third positioning area from top to bottom. A first expansion sleeve is provided between the first positioning area and the outer seat, which abuts against the inner wall of the first positioning area and the outer seat respectively. The second positioning area and the outer seat are interference-fitted. The outer diameter of the third positioning area gradually decreases from top to bottom. The third positioning area is interference-fitted with the outer seat, and the outer diameters of the first positioning area and the second positioning area are not greater than the outer diameter of the third positioning area.

[0007] Preferably, the first positioning area and the second positioning area are disposed near the top end of the inner seat, and the third positioning area is disposed near the bottom end of the inner seat; and / or, a wedge is provided between the third positioning area and the inner wall of the outer seat, which respectively abut against the third positioning area and the outer seat and form a conical surface fit.

[0008] Preferably, there is a gap between the outer side of the inner seat and the outer seat in the area between the first positioning area and the second positioning area.

[0009] Furthermore, the present invention also discloses a sand making machine, the sand making machine including the aforementioned main shaft, the sand making machine including a machine body, the machine body including an upper machine body and a lower machine body arranged from top to bottom; wherein, the upper machine body and the lower machine body abut against each other, and a sealing element is provided at the joint between the upper machine body and the lower machine body; or, one side of the bottom end of the upper machine body is rotatably connected to one side of the top end of the lower machine body, and the other side of the bottom end of the upper machine body abuts against the other side of the top end of the lower machine body.

[0010] Preferably, the machine body has a first cavity, and the machine body is provided with an inlet and an outlet communicating with the first cavity; a turntable is detachably fixedly sleeved on the first end of the main shaft, and a first driving device for driving the main shaft to rotate is connected to the second end of the main shaft; a second expansion sleeve is provided between the main shaft and the turntable, respectively abutting against the main shaft and the turntable; the turntable has a second cavity, and a first inlet is provided on the end of the turntable facing the inlet, respectively directly communicating with the inlet and the second cavity; the turntable is provided with a plurality of outlets respectively communicating with the first cavity and the second cavity.

[0011] Preferably, the turntable includes a first disc body and a second disc body arranged from top to bottom and connected together, a second cavity is formed between the first disc body and the second disc body, the first feed port is located at the top of the first disc body, the discharge port is located between the first disc body and the second disc body and is arranged towards the side wall of the machine body, and the top of the second disc body is provided with a bearing area for bearing materials so as to form a third material liner.

[0012] Preferably, the turntable is provided with a protective bar, which is slidably connected to the turntable in the vertical direction, and the downward force exerted by the material on the protective bar is greater than the upward force. The discharge port is formed between the protective bar and the first and second disc bodies. The protective bar has a symmetrical structure.

[0013] Preferably, a plurality of protective bars are detachably fixed to the outer side of the turntable along the circumference of the turntable; and / or, a plurality of protective plates are detachably fixed to the inner wall of the turntable.

[0014] Preferably, the sand making machine further includes a guide plate, which is located in the first cavity, spaced apart from the turntable, and positioned on the side of the turntable closer to the machine body. A first support plate is provided in the first cavity below the guide plate. The guide plate is fixedly connected to the side wall of the machine body and / or the first support plate. The guide plate, the first support plate, and the side wall of the machine body form a first receiving area communicating with the discharge port. A second receiving area communicating with the discharge port is formed between the end of the first support plate away from the machine body and the side of the guide plate away from the machine body. The first receiving area and the second receiving area are used to receive and store materials.

[0015] Preferably, the feed inlet is located directly above the first feed port, and there is a gap between the feed inlet and the first feed port; Alternatively, a material blocking curtain and a feeding hopper are sequentially arranged between the feed inlet and the first feed outlet in the direction from the feed inlet toward the first feed outlet. The feeding hopper is connected to the first feed outlet. The first end of the material blocking curtain is connected to the area of ​​the machine body corresponding to the feed outlet. The second end of the material blocking curtain abuts against the inner or outer side of the feeding hopper. The second end of the material blocking curtain is subjected to a first force, which is directed from the material blocking curtain toward the feeding hopper. When a set amount of material overflows from the feeding hopper, the overflowing material exerts a second force on the second end of the material blocking curtain away from the feeding hopper. The second force is greater than the first force and is in the opposite direction to the first force.

[0016] The present invention achieves the following technical effects compared to the prior art: The main shaft mounting and lubrication mechanism of this invention includes a main shaft. The first end of the main shaft is located inside the sand making machine, and the second end of the main shaft extends out of the sand making machine. An inner seat and an outer seat are sequentially fitted from the inside to the outside of the area between the first end and the second end of the main shaft. Several bearings are provided between the main shaft and the inner seat, which are fitted on the main shaft and rotatably located inside the inner seat. The main shaft and the bearings are interference-fitted. The inner wall of the inner seat is provided with a bearing area for supporting the bearings. The bottom end of the inner seat and the bottom end of the sand making machine are detachably and fixedly connected. Therefore, while the sand making machine stably supports the inner seat, it also supports the main shaft. The external load on the main shaft can be transmitted to the sand making machine through the bearings and the inner seat, thereby sharing the load on the main shaft, reducing the axial movement of the main shaft, reducing the probability of the main shaft breaking due to excessive load and axial movement wear, and reducing the maintenance cost of the main shaft and the sand making machine using the main shaft mounting and lubrication mechanism of this invention. Meanwhile, if the two ends of the main shaft are connected to the sand making machine through flanges respectively, due to the tolerance range in flange production, it is difficult for the flanges at the top and bottom of the main shaft to be aligned with the sand making machine housing at the same time. For example, when the lower flange is fixed and tightened by bolts, there will be a gap between the upper flange and the sand making machine housing. At this time, the bolts will apply additional tension force to the upper flange and the main shaft, which will cause the main shaft to be easily pulled and broken (even if there is only a slight deviation, the main shaft will be subjected to additional tension force, which will aggravate the damage to the main shaft). As can be seen from the above, the present invention avoids the situation of connecting the two ends of the main shaft to the sand making machine through two flanges respectively through the above structure, reducing the probability of damage to the main shaft and reducing the maintenance cost of the main shaft and the sand making machine using the main shaft installation and lubrication mechanism of the present invention. Furthermore, the outer side of the inner seat is provided with a first positioning area, a second positioning area, and a third positioning area from top to bottom. A first expansion sleeve is provided between the first positioning area of ​​the inner seat and the outer seat, respectively abutting against the inner walls of the first positioning area and the outer seat. The second positioning area is interference-fitted with the outer seat, and the outer diameter of the third positioning area gradually decreases from top to bottom, also being interference-fitted with the outer seat. The outer diameters of the first and second positioning areas are not greater than the outer diameter of the third positioning area, ensuring that the outer seat can be smoothly fitted onto the outer side of the inner seat. The arrangement of the first, second, and third positioning areas allows the outer seat to be securely fitted onto the outer side of the inner seat, improving the rigidity of the main shaft and the inner seat, sharing the load on the main shaft, reducing the frequency of radial runout and axial movement of the main shaft and the inner seat, reducing fatigue damage to the main shaft, and consequently reducing the maintenance cost of the sand making machine using the main shaft of this invention. As can be seen from the above, the maintenance cost of the sand making machine using the main shaft of this invention can be effectively reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a longitudinal section view of the sand making machine; Figure 2 This is a longitudinal section view of the rotor; Figure 3 This is a top view of the rotor; Figure 4 A schematic diagram of the spindle mounting and lubrication mechanism; The components include: 1. Machine body; 2. Feed inlet; 3. Discharge outlet; 4. Turntable; 5. First feed inlet; 6. Discharge outlet; 7. Guide plate; 8. Main material flow; 9. Dividing material flow; 10. Vortex impact material flow; 11. Vortex falling material flow; 12. Feed hopper; 13. Material blocking curtain; 14. Inspection door; 15. First material liner; 16. Second material liner; 17. Limiting plate; 18. First bearing plate; 19. Second bearing plate; 20. Main shaft; 21. Inner seat; 22. Cover plate; 23. Spiral blade; 24. First bearing; 25. Belt. 26. Wheel; 27. Sealing component; 28. Second drive device; 29. ​​First disc body; 20. Second disc body; 31. Feed hopper; 32. Second cavity; 33. Inlet; 34. Return port; 35. Upper body; 36. Lower body; 37. First expansion sleeve; 38. Second positioning area; 39. Third positioning area; 40. Outer seat; 41. Second bearing; 42. Second expansion sleeve; 43. Protective bar; 44. Protective plate; 45. Third material liner; 46. Eddy current dropper; 47. First wedge plate; 48. Second wedge plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-4As shown, this invention discloses a spindle mounting and lubrication mechanism, which includes a spindle 20. The first end of the spindle 20 is located inside a sand making machine, and the second end of the spindle 20 extends out of the sand making machine. An inner seat 21 and an outer seat 39 are sequentially fitted from the inside out on the outer side of the area between the first and second ends of the spindle 20. A plurality of bearings are provided between the spindle 20 and the inner seat 21, which are fitted onto the spindle 20 and rotatably disposed inside the inner seat 21. The spindle 20 and the bearings are interference-fitted. The inner wall of the inner seat 21 is provided with a support for the bearings. The bearing area of ​​the inner seat 21 is detachably and fixedly connected to the bottom end of the sand making machine. Therefore, while the sand making machine stably supports the inner seat 21, it also supports the main shaft 20. The external load on the main shaft 20 can be transmitted to the sand making machine through the bearing and the inner seat 21, thereby sharing the load on the main shaft 20, reducing the axial movement of the main shaft 20, reducing the probability of the main shaft 20 breaking due to excessive load and axial movement, and reducing the maintenance cost of the main shaft 20 and the sand making machine using the main shaft installation and lubrication mechanism of the present invention. Meanwhile, if the two ends of the main shaft are connected to the sand making machine through flanges respectively, due to the tolerance range in flange production, it is difficult for the flanges at the top and bottom of the main shaft to be aligned with the sand making machine housing at the same time. For example, when the lower flange is fixed and tightened by bolts, there will be a gap between the upper flange and the sand making machine housing. At this time, the bolts will apply additional tension force to the upper flange and the main shaft, which will cause the main shaft to be easily pulled and broken (even if there is only a slight deviation, the main shaft will be subjected to additional tension force, which will aggravate the damage to the main shaft). As can be seen from the above, the present invention avoids the situation of connecting the two ends of the main shaft 20 to the sand making machine through two flanges respectively through the above structure, reduces the probability of damage to the main shaft 20, and reduces the maintenance cost of the main shaft and the sand making machine using the main shaft installation and lubrication mechanism of the present invention. Furthermore, the outer side of the inner seat 21 is provided with a first positioning area, a second positioning area 37, and a third positioning area 38 from top to bottom. A first tightening sleeve 36 is provided between the first positioning area of ​​the inner seat 21 and the outer seat 39, respectively abutting against the inner walls of the first positioning area and the outer seat 39. The second positioning area 37 is interference-fitted with the outer seat 39. The outer diameter of the third positioning area 38 gradually decreases from top to bottom, and the third positioning area 38 is interference-fitted with the outer seat 39. The outer diameters of the first positioning area and the second positioning area 37 are not greater than the outer diameter of the third positioning area 38, ensuring that the outer seat 39 can smoothly... The outer seat 39 is fitted onto the outside of the inner seat 21. The arrangement of the first positioning area 37 and the third positioning area 38 ensures that the outer seat 39 can be securely fitted onto the outside of the inner seat 21, improving the rigidity of the main shaft 20 and the inner seat 21, distributing the load on the main shaft 20, reducing the frequency of radial runout and axial movement of the main shaft 20 and the inner seat 21, reducing fatigue damage to the main shaft 20, and thus reducing the maintenance cost of the sand making machine using the main shaft 20 of this invention. As can be seen from the above, the maintenance cost of the sand making machine using the main shaft 20 of this invention can be effectively reduced. Furthermore, even if the outer seat 39 is damaged, it can be replaced by removing the first tightening sleeve 36 and lifting the inner seat 21 upwards. This simplifies the disassembly and assembly steps of the outer seat 39, making the maintenance of the sand making machine using the main shaft 20 of this invention more convenient.

[0022] It should be noted that in the prior art, the top and bottom ends of the base outside the main shaft 20 are fixedly connected to the sand making machine by flanges and bolts. On the one hand, because flange production has tolerance ranges, the flanges at the top and bottom ends of the base cannot be aligned. For example, when the lower flange is fixed and tightened by bolts, there is a gap between the upper flange and the base. In fact, it is held in place by the bolts, which makes the upper flange and the main shaft 20 easy to be strained and broken (even a deviation of only a few micrometers will cause the base and the main shaft 20 to be subjected to tension force, aggravating the damage to the main shaft 20). The present invention, through the above structure, eliminates the need for... The aforementioned flange effectively suppresses the radial runout and axial movement of the main shaft 20. On the other hand, when the base needs to be replaced, not only must the bolts be removed one by one, but the base is also easily jammed by the flange during removal, making the disassembly and assembly of the base quite cumbersome. However, when the outer base 39 of this invention needs to be replaced, only the first expansion sleeve 36 needs to be removed and pulled upwards for replacement. When the inner base 21 needs to be replaced, the connection between the inner base 21 and the sand making machine can be disconnected for replacement. Since no flange is provided, the inner base 21 will not be blocked by the flange when it is removed. Obviously, the replacement of the inner base 21 and the outer base 39 in this invention is more convenient.

[0023] Among them, such as Figures 1-4As shown, both the inner seat 21 and the outer seat 39 are cylindrical structures. Depending on the operating conditions, a first bearing and a second bearing 40 can be fitted onto the main shaft 20. The first bearing can be a thrust bearing, and the second bearing 40 can be a roller bearing. The bearing area can specifically be a stepped structure located on the inner wall of the inner seat 21. The bearing can have a clearance fit or a transition fit with the inner wall of the inner seat 21. The bottom end of the inner seat 21 is provided with a cover plate, which can be connected to the bottom end of the inner seat 21 and the bottom end of the sand making machine using bolts or other fasteners. The first positioning area, the second positioning area 37, and the third positioning area 38 refer to the outer regions of the inner side. A groove for placing the first expansion sleeve 36 can be opened in the area corresponding to the first positioning area on the inner wall of the outer seat 39. The first expansion sleeve 36 can be fixed with bolts, thereby allowing the first expansion sleeve 36 to have an interference fit with the inner seat 21 and the outer seat 39 respectively. Because the outer diameter of the third positioning area 38 gradually decreases from top to bottom, the inner diameter of the area corresponding to the third positioning area 38 on the inner wall of the outer seat 39 gradually increases from top to bottom. This means that the corresponding area of ​​the third positioning area 38 and the inner wall of the outer seat 39 is equivalent to forming a conical fit (the longitudinal section of the third positioning area 38 and the longitudinal section of the area corresponding to the third positioning area 38 on the inner wall of the outer seat 39 are similar to a conical surface).

[0024] like Figures 1-4 As shown, the first and second positioning areas 37 are located near the top of the inner seat 21, and the third positioning area 38 is located near the bottom of the inner seat 21. This ensures that the top and bottom areas of the outer seat 39 can reliably abut and fit against the outside of the inner seat 21, guaranteeing the rigidity between the spindle 20, the inner seat 21, and the outer seat 39. Figures 1-4 As shown, there is a gap between the outer side of the inner seat 21 and the outer seat 39 in the area between the first positioning area and the second positioning area 37. This provides a certain deformation space for the outer side of the inner seat 21 in the area between the first positioning area and the second positioning area 37, so that the load on the spindle 20 can be released through the small deformation of the outer side of the inner seat 21 in the area between the first positioning area and the second positioning area 37, thereby reducing the damage to the spindle 20.

[0025] Furthermore, a wedge-shaped element is provided between the inner wall of the third positioning area 38 and the inner wall of the outer seat 39, forming a conical positioning surface with the inner wall of the third positioning area 38 and the outer seat 39 respectively. The wedge-shaped element includes several wedge-shaped blocks or wedge-shaped plates. Figure 4As shown, the wedge clamping member includes a first wedge clamping plate 47 and a second wedge clamping plate 48. Both sides of the first wedge clamping plate 47 are inclined and abut against the inner wall of the third positioning area 38 and the outer seat 39 respectively (the two sides of the first wedge clamping plate 47 can be interference-fitted with the third positioning area 38 and the outer seat 39) so as to form conical positioning with the inner wall of the third positioning area 38 and the outer seat 39 respectively. Both sides of the second wedge clamping plate 48 are also inclined and abut against the inner wall of the third positioning area 38 and the outer seat 39 respectively (the two sides of the second wedge clamping plate 48 can be interference-fitted with the third positioning area 38 and the outer seat 39) so as to form conical positioning with the inner wall of the third positioning area 38 and the outer seat 39 respectively. The first wedge clamping plate 47 and the second wedge clamping plate 48 can be sleeved on fasteners such as bolts from top to bottom and fixedly connected to the cover plate 22 by bolts.

[0026] like Figures 1-4As shown, the spindle mounting and lubrication mechanism also includes a spindle 20. The first end of the spindle 20 extends into the first cavity. A turntable 4 and an inner seat 21 are spaced apart at the first end of the spindle 20 from the feed port 2 towards the discharge port 3. The turntable 4 and the spindle 20 are fixedly connected, and the connection between the turntable 4 and the spindle 20 can be a key connection or a screw connection, etc. The inner seat 21 is rotatably connected to the spindle 20. Specifically, a bearing 24 is sleeved between the inner seat 21 and the spindle 20. The inner seat 21 has a housing for mounting the first bearing. The bearing housing 24 has an inner seat 21 with both ends and a cover plate 22 connected by bolts. The inner seat 21 has retaining rings near both ends, each with several bolt holes on its circumference. The retaining rings are then fixed to a mounting bracket located outside the inner seat 21 by bolts. The inner seat 21 is a hollow structure, with a cover plate 22 fitted over the main shaft 20 at both its top and bottom. The inner seat 21 and / or the cover plate 22 have a first channel communicating with the main shaft 20 and used for injecting lubricating medium. One channel is connected to a lubricating oil station via a delivery pipeline (the lubricating oil station supplies lubricating oil and other lubricating and cooling media to the first channel through its own low-pressure pump or other delivery pumps; the lubricating oil station is existing technology, and its specific structure and working process will not be described in detail; alternatively, the lubricating oil station can also supply other media that can provide lubricating and cooling functions to the first channel); or, a plug is detachably connected to the inlet 32 ​​of the first channel. In this case, when it is necessary to add lubricating oil or other lubricating and cooling media to the first channel, the operator can first remove the plug and manually add the lubricating and cooling media to the first channel through an oil storage device such as an oil drum. After the addition is completed, the plug is sealed at the inlet 32 ​​of the first channel; wherein, the plug is made of elastic materials such as rubber, and the plug and the inlet 32 ​​are interference fit; or, the plug is made of metal materials such as steel, and the plug and the inlet 32 ​​are threaded; or, the plug can also be made of other materials and detachably connected to the inlet 32 ​​in other ways, but it must be ensured that the plug can seal the inlet 32. Furthermore, the first channel is equipped with a return port 33 connected to it, allowing a circulation loop of lubricating medium to be formed through the inlet 32, return port 33, the first channel, and the lubrication station. Alternatively, water or other types of cleaning fluid can be added to the first tank to clean the main shaft 20 when the sand making machine is stopped. Moreover, sealing rings or other sealing components are provided between the cover plate 22 and the inner seat 21, and between the cover plate 22 and the main shaft 20. When the inlet 32 ​​of the first channel is equipped with the aforementioned plug, this reduces the possibility of damage to the main shaft 20 due to insufficient lubrication medium supply caused by a lubrication station malfunction.

[0027] Furthermore, such as Figures 1-4As shown, the inner seat 21 has a first channel opened along the axial direction of the main shaft 20. The first channel is provided with a helical blade 23 fixed on the main shaft 20 and arranged along the axial direction of the main shaft 20. The helical blade 23 and the inner seat 21 are spaced apart. When the first drive device drives the main shaft 20 to rotate, the main shaft 20 drives the helical blade 23 to rotate. The helical blade 23 drives the lubricating medium in the first channel to flow. Compared with the method without the helical blade 23, this improves the fluidity of the lubricating medium in the first channel, enhances the lubrication performance of the main shaft 20, and reduces the wear of the main shaft 20. The distance between the end of the spiral blade 23 furthest from the main shaft 20 and the inner wall of the inner seat 21 is the same in all different regions. Through multiple experiments, the distance between the end of the spiral blade 23 furthest from the main shaft 20 and the inner wall of the inner seat 21 is controlled within a certain range, so that the oil pressure in the first channel is stable in the low-pressure range of 0.1-0.3MPa (the first range refers to the distance between the end of the spiral blade 23 furthest from the main shaft 20 and the inner wall of the inner seat 21 when the oil pressure in the first channel is stable at 0.1-0.3MPa). This allows the lubricating medium to lubricate the main shaft 20 under low-pressure conditions, reducing the leakage caused by the strong penetrating power of the lubricating oil when high-pressure lubrication is used, which easily passes through the seal between the inner seat 21 and the cover plate 22. It also reduces the squeezing and friction on the seal, delays the speed at which the seal fails due to deformation and wear, and reduces the maintenance cost due to seal wear.

[0028] like Figures 1-4 As shown, this invention discloses a sand making machine with a wear-resistant rotor (the rotor and turntable 4 are of the same structure). The sand making machine includes the aforementioned main shaft mounting and lubrication mechanism and a machine body. The machine body includes an upper machine body 34 and a lower machine body 35 arranged from top to bottom. The upper machine body 34 and the lower machine body 35 abut against each other, and a sealing element is provided between the upper machine body 34 and the lower machine body 35. Thus, when the sand making machine needs to be repaired, the upper machine body 34 can be lifted by a hydraulic cylinder or other driving equipment to start the machine for repair. Alternatively, one side of the bottom end of the upper machine body 34 is rotatably connected to one side of the top end of the lower machine body 35, and the other side of the bottom end of the upper machine body 34 abuts against the other side of the top end of the lower machine body 35. In this case, the upper machine body 34 can be driven to rotate by a hydraulic cylinder, exposing the internal space of the sand making machine for repair.

[0029] like Figures 1-4 As shown, the machine body 1 has a first cavity, and the machine body 1 is provided with an inlet 2 and an outlet 3 communicating with the first cavity. A turntable 4 is detachably and fixedly sleeved on the first end of the main shaft 20 (the main shaft 20 and the turntable can be connected by a key or bolts, or, as shown). Figures 1-4As shown, a second expansion sleeve 41 is provided between the main shaft 20 and the turntable. The second expansion sleeve 41 is fixed by bolts or other fasteners, so that the second expansion sleeve 41 is interference-fitted with both the main shaft 20 and the turntable. The second end of the main shaft 20 is connected to a first drive device, which drives the turntable 4 to rotate. The turntable 4 has a second cavity 31. The end of the turntable 4 facing the feed inlet 2 is provided with a first inlet 5 that communicates with both the feed inlet 2 and the second cavity 31. The turntable 4 is provided with several discharge ports 6 that communicate with both the first cavity and the second cavity 31. 7 is located in the first cavity, spaced apart from the turntable 4, and on the side of the turntable 4 closer to the machine body 1. The first cavity is provided with a first support plate 18 located below the guide plate 7. The guide plate 7 and the side wall of the machine body 1 and / or the first support plate 18 are fixedly connected. The guide plate 7, the first support plate 18 and the side wall of the machine body 1 surround to form a first receiving area communicating with the discharge port 6. A second receiving area communicating with the discharge port 6 is formed between the end of the first support plate 18 away from the base and the side of the guide plate 7 away from the base. The first receiving area and the second receiving area are used to receive and store materials. When material is added to the first cavity through the feed inlet 2, the material enters the first feed inlet 5 through the feed inlet 2 and reaches the second cavity 31. At the same time, the first driving device drives the turntable 4 to rotate, and the turntable 4 throws the material in the second cavity 31 out through the discharge outlet 6 and into the first and second receiving areas. The material entering the first receiving area accumulates in the first receiving area and forms the first material liner 15, and the material entering the second receiving mixing area accumulates in the second receiving area and forms the second material liner 16. The first material liner 15 separates the material on the guide plate 7 and the material on the subsequent throwing guide plate 7, so that the material on the subsequent throwing guide plate 7 collides, impacts, and crushes with the material in the material liner, and directly impacts the guide plate 7. Compared to the previous method, this reduces the wear and deformation of the guide plate 7, and lowers the failure rate of the sand making machine. The second material liner 16 acts as a "buffer" between the guide plate 7 and the inner wall of the machine body 1. The second material liner 16 can absorb the energy transmitted from the first material liner 15 and the guide plate 7 to the inner wall of the machine body 1 through the compression deformation of the internal material, reducing the force transmitted from the material impacting the first material liner 15 to the inner wall of the machine body 1 through the guide plate 7 and the second material liner 16. This reduces the impact of material on the first material liner 15, thus reducing the deformation and cracking of the inner wall of the machine body 1, and further reducing the failure rate of the sand making machine. In summary, using the sand making machine of the present invention can effectively reduce the failure rate of the sand making machine and reduce the maintenance cost of the sand making machine.

[0030] Depending on the operating conditions, the sand making machine with a wear-resistant rotor in this invention can be used for crushing or grinding materials such as stone, grain, coal, and pharmaceuticals; the sand making machine with a wear-resistant rotor can be a vertical or horizontal sand making machine, such as... Figures 1-4As shown, when the sand making machine is a vertical sand making machine, the feed inlet 2 and the discharge outlet 3 are arranged alternately from top to bottom. When the sand making machine is a horizontal sand making machine, the feed inlet 2 and the discharge outlet 3 can be arranged alternately in the horizontal direction.

[0031] Turntable 4 can be a single unit, or it can be a modular unit, such as... Figures 1-4 As shown, the turntable 4 includes a first disc body 28 and a second disc body 29 arranged from top to bottom. The first disc body 28 and the second disc body 29 are detachably and fixedly connected by fasteners such as bolts. A second cavity 31 is formed between the first disc body 28 and the second disc body 29, and the top of the second disc body is provided with a bearing area for carrying materials to form a bearing area for a third material liner 45. The material liner isolates the inner wall of the turntable from subsequent materials, reducing wear on the turntable. Figure 2 , Figure 3 As shown, the turntable is equipped with a protective bar 42, which is slidably connected to the turntable in the vertical direction. Compared with welding or bolting the protective bar 42 to the turntable, when the protective bar 42 needs to be replaced, it can be lifted upwards, making it easy to replace. Furthermore, the downward force exerted on the protective bar 42 by the material is greater than the upward force, allowing the protective bar 42 to be stably pressed into the turntable by the material. A discharge port is formed between the protective bar 42 and the first and second disc bodies, which distributes the impact of the material, reducing damage to the turntable. The protective bar 42 can also be designed as a symmetrical structure; when one side of the protective bar 42 wears significantly, its direction can be reversed, reducing the frequency of replacement. The protective bar 42 can be made of wear-resistant materials such as stainless steel or alumina ceramic, making it less prone to damage and extending its service life.

[0032] Furthermore, a number of protective bars 43 are detachably fixed to the outer side of the turntable along the circumference of the turntable; and / or, a number of protective plates 44 are detachably fixed to the inner wall of the turntable. The protective bars 43 and protective plates 44 reduce the material impacting the turntable and reduce the wear of the turntable. The protective bars 43 and protective plates 44 can also be made of wear-resistant materials such as stainless steel or alumina ceramic.

[0033] The first inlet 5 can be located at the center or edge of the turntable 4, ensuring that the material coming out of the inlet 2 can enter the first inlet 5. The inlet 2 can be located directly above the first inlet 5, with a gap between the inlet 2 and the first inlet 5. After the material is fed in through the inlet 2, it falls a certain distance and then enters the second cavity 31 through the first inlet 5. Alternatively, the inlet 2 and the first inlet 5 can be connected by a pipe, with both ends of the pipe connected to the inlet 2 and the first inlet 5, respectively.

[0034] Or, such as Figures 1-4As shown, a material blocking curtain 13 and a feeding hopper 12 are sequentially arranged between the feed inlet 2 and the first feed inlet 5, moving from the feed inlet 2 towards the first feed inlet 5. The feeding hopper 12 is located at and connected to the first feed inlet 5. The first end of the material blocking curtain 13 is connected to the area corresponding to the machine body 1 and the feed inlet 2. The second end of the material blocking curtain 13 abuts against the inner or outer side of the feeding hopper 12. The second end of the material blocking curtain 13 is subjected to a first force, which is directed from the material blocking curtain 13 towards the feeding hopper 12. When less than a set amount of material overflows from the feeding hopper 12, the first force keeps the second end of the material blocking curtain 13 abutting against the feeding hopper 12. This prevents the feed inlet 2 from directly connecting to the second cavity 31. The material entering from the feed inlet 2 can only pass through the material blocking curtain 13 and the first feed inlet 5 sequentially, and be thrown out from the discharge port 6 of the turntable 4. When a set amount of material overflows from the turntable 4, the overflow... The material exiting the feed hopper 12 exerts a second force on the blocking curtain 13, moving away from the feed hopper 12. This second force is greater than the first force and is in the opposite direction to the first force, causing the second end of the blocking curtain 13 to move away from the feed hopper 12. A gap is created between the blocking curtain 13 and the feed hopper 12. At this time, a portion of the material entering from the inlet 2 enters the second cavity 31 and is thrown out from the discharge port 6. Another portion of the material falls into the second cavity 31 from the gap between the blocking curtain 13 and the feed hopper 12. For easy distinction, the material flow thrown out from the discharge port 6 is called the "main material flow 8", and the material flow moving from the gap between the blocking curtain 13 and the feed hopper 12 towards the discharge port 3 is called the "dividing material flow 9". During the process of the dividing material flow 9 moving towards the discharge port 3, the dividing material flow 9 is impacted by the main material flow 8 several times, achieving "stone-on-stone" crushing and improving the material crushing effect.

[0035] Alternatively, a feed hopper 30 can be installed at the feed inlet 2, and the first end of the material blocking curtain 13 can be connected to the end of the feed hopper 30 that extends into the first cavity, for example, by bonding or by fixing with bolts.

[0036] The first force can be generated in different ways. For example, when the material blocking curtain 13 is made of a flexible material such as rubber, the second end of the material blocking curtain 13 and the hopper are in an interference fit, and the first force is the flexible restoring force generated by the material blocking curtain 13 itself towards the hopper; or, a restoring spring is provided between the second end of the material blocking curtain 13 and the hopper, and the restoring spring applies the first force to the material blocking curtain 13.

[0037] Furthermore, the sand making machine also includes an adjustment assembly located at the first inlet 5. This assembly includes a sealing member 26 located at the first inlet 5 and a second drive device 27 connected to the sealing member 26. The second drive device 27 is used to move the sealing member 26 towards and away from the first inlet 5. For example, when the sealing member 26 is a baffle with one end rotatably connected to the first inlet 5 (the baffle is large enough to completely block the first inlet 5 when needed), the second drive device 27 is a linear drive device such as a hydraulic cylinder. The output shaft of the second drive device 27 is inclined to the centerline of the first inlet 5, and the output end of the second drive device 27 is connected to the other end of the baffle. By adjusting the length of the output shaft of the second drive device 27, the rotation angle of the baffle can be driven, thereby adjusting the opening of the first inlet 5. Or, as... Figures 1-4 As shown, the moving direction of the second drive device 27 is perpendicular to the center line of the first feed inlet 5. At this time, the second drive device 27 is a linear drive device such as a hydraulic cylinder. When the second drive device 27 drives the baffle to move away from the feed hopper 12, for example... Figure 1 When the feed is moved to the right, the opening of the first feed inlet 5 increases. When the second drive device 27 moves the baffle towards the direction closer to the feed hopper 12, for example... Figure 1 When the device moves to the left, the opening of the first inlet 5 decreases; alternatively, the regulating component includes a valve located at the first inlet 5, which adjusts the opening of the first inlet 5. Specifically, the valve can be a ball valve or a gate valve that controls the opening of the first inlet 5. Since the main material flow 8 is thrown out from the turntable 4 and the distribution flow 9 falls naturally, the main material flow 8 has high kinetic energy. When a smaller particle size is required, the regulating component can be used to increase the opening of the first inlet 5, thereby increasing the output of the main material flow 8 and enhancing the impact between the main material flow 8 and the distribution flow 9. When the output particle size meets the requirements, the regulating component can be used to appropriately decrease the opening of the first inlet 5, increasing the output of the distribution flow 9 and thus reducing the energy consumption of the turntable 4.

[0038] If the internal space of the first cavity is sufficient, the second drive device 27 can be installed inside the first cavity; if the internal space of the first cavity is small, when the second drive device 27 is a hydraulic cylinder, the cylinder body of the hydraulic cylinder can be installed outside the first cavity, so that the piston rod of the hydraulic cylinder extends into the first cavity and connects with the sealing component 26, and a sealing component such as a sealing ring is provided between the piston rod and the machine body 1.

[0039] The first driving device can be a rotary motor or hydraulic motor, or other driving structure capable of rotating the turntable 4. The output end of the first driving device can be directly connected to the turntable 4 to drive its rotation, or the output end of the first driving device can be connected to the turntable 4 via a gear set or belt drive structure. Figures 1-4As shown, a pulley 25 is fitted on the second end of the main shaft 20, which is located on the outside of the first cavity. The pulley 25 is connected to the drive wheel fitted on the output end of the first drive device through a transmission belt. Thus, when the first drive device drives the drive wheel to rotate, the drive wheel drives the pulley 25 and the main shaft 20 to rotate through the transmission belt.

[0040] The discharge port 6 can be located at the end of the first turntable 4 facing the feed port 2, or, as... Figure 1 , Figure 2 As shown, a number of discharge ports 6 (uniformly or unevenly arranged) are arranged on the side of the turntable 4 along the circumference of the first turntable 4. Alternatively, the discharge ports 6 can also be arranged in other positions of the turntable 4, but it is necessary to ensure that the material thrown out by the discharge ports 6 can reach the first and second receiving areas.

[0041] The deflector 7 is specifically made of steel or other metal materials with sufficient strength. The deflector 7 is fixed to the first bearing plate 18 and / or the corresponding area of ​​the side wall of the body 1 by welding or bolting. Only one deflector 7 may be provided, such as... Figures 1-4 As shown, the guide plate 7 is annular, and the turntable 4 and the guide plate 7 are arranged sequentially from the inside to the outside; or, several guide plates 7 are arranged along the circumference of the body 1 in the first cavity. In this case, the guide plate 7 can be annular, flat, wavy, or arc-shaped, etc. It is necessary to ensure that the guide plate 7 can surround the first bearing plate 18 and the side wall of the body 1 to form the first accommodating area.

[0042] like Figures 1-4 As shown, the guide plate 7 is annular and includes a first guide section and a second guide section arranged from top to bottom. The longitudinal section of the first guide section is arc-shaped (the first guide section can also be called the vortex drop 46), and the first guide section protrudes towards the side closer to the machine body 1. The second guide section is inclined to the side wall of the machine body 1 and is set towards the discharge port 3. The arrangement of the first and second guide sections allows the main material flow 8 thrown out of the discharge port 6 by the turntable 4 to gradually accumulate after impacting the guide plate 7, and form an inclined surface along the guide plate 7, namely the second material liner 16. After the subsequent main material flow 8 impacts the second material liner 16, it will be carried by inertia along the second guide section and the first guide section in sequence. The upward movement of the first guide section forms a vortex, which is referred to as the vortex impact flow 10 for easy distinction. Subsequently, the vortex impact flow 10 moves downward under its own weight to form the vortex falling flow 11. In this way, the main flow 8 or the main flow 8 and the branch flow 9 will impact the vortex impact flow 10 and the vortex falling flow 11 multiple times, thereby improving the material impact and crushing effect. Moreover, because the longitudinal section of the first guide section is arc-shaped and the shape transition is relatively gentle, the flow of material on the first guide section and the second material liner 16 is smoother, reducing the problem of the material causing a strong impact on the guide plate 7 under the action of inertia due to the abrupt change in the shape of the first guide section, thus reducing the wear of the guide plate 7.

[0043] Furthermore, a second support plate 19 is provided above the guide plate 7 within the first cavity. The first support plate 18, the second support plate 19, the guide plate 7, and the side wall of the body 1 surround and form a first receiving area. The guide plate 7 is fixedly connected to at least one of the first support plate 18, the second support plate 19, and the side wall of the body 1 (the fixed connection is specifically welding or bolting). The second support plate 19 acts as a "cover" for the first receiving area, which makes the first material liner 15 more stable and less likely to overflow from the top of the first receiving area, thus continuously providing a buffering effect and reducing damage to the guide plate 7 and the side wall of the body 1. The first support plate 18 and the second support plate 19 can be arranged parallel or inclined, as long as the first material liner 15 can be formed within the first receiving area.

[0044] Furthermore, the first receiving area is connected to the discharge port 6 through the first inlet 32; wherein, the guide plate 7 is provided with the first inlet 32; and / or, when the first support plate 18, the guide plate 7 and the side wall of the machine body 1 cooperate to form the first receiving area, the first inlet 32 ​​is located between the first support plate 18 or the side wall of the machine body 1 and the guide plate 7, that is, at this time the gap between the guide plate 7 and the first support plate 18 or the side wall of the machine body 1 is the first inlet 32; when the first support plate 18, the second support plate 19, the guide plate 7 and the side wall of the machine body 1 cooperate to form the second receiving area, the guide plate 7 has at most a gap between it and two of the first support plate 18, the second support plate 19 and the side wall of the machine body 1, that is, the first inlet 32, so that while ensuring the presence of the first inlet 32, the guide plate 7 can be fixed in the first cavity. The second receiving area has an opening on the side facing the discharge port 6, which allows the discharge port 6 to directly enter the second receiving area through the opening; the first inlet 32 ​​can be connected to the discharge port 6 through the opening, or directly connected to the discharge port 6.

[0045] Furthermore, the sand making machine also includes a limiting plate 17 fixed in the first cavity. The limiting plate 17 is located at the end of the first bearing plate 18 away from the machine body 1. The top of the limiting plate 17 is higher than the first bearing plate 18 and lower than the top of the guide plate 7. At this time, the first bearing plate 18, the guide plate 7 and the limiting plate 17 surround to form a second accommodating area. If a second bearing plate 19 is provided, the first bearing plate 18, the second bearing plate 19, the guide plate 7 and the limiting plate 17 surround to form a second accommodating area. Since the top of the limiting plate 17 is higher than the top of the first bearing plate 18, a certain amount of material is not easy to fall out of the second accommodating area, so as to ensure the continuous existence of the second material liner 16 and isolate the guide plate 7 from the subsequent material flow, thereby reducing the wear of the guide plate 7. When the second support plate 19 and the limiting plate 17 are not present, the opening is the gap between the side of the guide plate 7 away from the body 1 and the second accommodating area formed by the first support plate 18 facing the turntable 4; when the second support plate 19 is present but the limiting plate 17 is not present, the opening is between the first support plate 18 and the second support plate 19, and is located in the gap between the guide plate 7 away from the body 1; when the limiting plate 17 is present but the second support plate 19 is not present, the opening is the gap between the second accommodating area formed by the guide plate 7, the limiting plate 17 and the first support plate 18 facing the turntable 4; when the limiting plate 17 and the second support plate 19 are present, the opening is the gap between the limiting plate 17 and the second support plate 19.

[0046] Furthermore, such as Figures 1-4 As shown, the machine body 1 is equipped with a maintenance passage that communicates with the first chamber and serves as an access route for operators (the maintenance passage is large enough for operators to enter and exit smoothly). A maintenance door 14 is located at the maintenance passage. When the sand making machine does not require shutdown for maintenance, the maintenance door 14 blocks the maintenance passage. When maintenance is needed, the maintenance door 14 is opened to access the maintenance passage. This allows operators to directly enter the first chamber to inspect and maintain the internal structure, including the turntable 4, eliminating the need for disassembly in traditional sand making machines, thus shortening maintenance time and reducing downtime costs. Furthermore, the turntable 4 is matched to the first chamber; therefore, while the machine body 1 has a large size, the size of the turntable 4 also increases accordingly, thereby increasing the linear velocity of the turntable 4 (tests show that the linear velocity of the turntable 4 can reach over 80 m / s). This increases the kinetic energy provided by the turntable 4 for material crushing, improving the material crushing effect. Specifically: E = 1 / 2 mv 2 (Where m is the material mass and v is the linear velocity of the turntable 4), when the material is granite particles, with a particle size of 4.75mm granite (density ρ=2.6g / cm³),... 3 For example: the volume of a single stone is V = 1 / 3πr 2 h (approximately a cone, r = 2.375 mm, h = 4.75 mm) ≈ 27.6 mm 3 The mass of a single particle is m = ρV ≈ 2.6 g / cm³.3 ×0.0276cm 3 ≈0.0718g = 7.18 × 10 -5 kg; The kinetic energy that the rotor of a traditional sand making machine can apply to a single stone particle (the linear velocity that the rotor of a traditional sand making machine can achieve is v=60m / s): E1=1 / 2×7.18×10 -5 kg×(60m / s) 2 ≈1.29J; The kinetic energy that the turntable 4 of the sand making machine can apply to a single stone in this invention (taking the linear velocity of the turntable 4 in this invention as 80m / s as an example) (v=80m / s): E2=1 / 2×7.18×10 -5 kg×(80m / s) 2 ≈2.30J; Experimental measurements show that the breaking limit kinetic energy of 4.75mm granite is approximately 1.8J, while the kinetic energy gap of traditional sand making machines reaches 28.3%. The kinetic energy of the sand making machine in this invention exceeds the critical value by 27.8%. In the challenging granite sand making process, production verification shows that the proportion of finished products with particles smaller than 4.75mm can be crushed in one go, accounting for 85%, and the amount of oversized recycled material is reduced by more than 70%, reducing the energy consumption per ton of sand to 30%.

[0047] In this document, "several" refers to at least one. "And / or" refers to text content preceding and / or following it, which can exist simultaneously or individually. For example, A and / or B includes either only A or B, or both A and B. This invention discloses multiple technical solutions, but does not provide any contrary technical teachings. Any content not covered in this invention is applicable to existing technologies.

[0048] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A spindle mounting and lubrication mechanism, characterized in that, The main shaft mounting and lubrication mechanism includes a main shaft, the first end of which is located inside the sand making machine, and the second end of which extends out of the sand making machine. An inner seat and an outer seat are sequentially fitted from the inside to the outside of the area between the first end and the second end of the main shaft. Among them, a plurality of bearings are provided between the main shaft and the inner seat, which are sleeved on the main shaft and rotatably disposed on the inner side of the inner seat. The main shaft and the bearings are interference fit. The inner wall of the inner seat is provided with a bearing area for supporting the bearings. The bottom end of the inner seat is detachably and fixedly connected to the bottom end of the sand making machine. The outer side of the inner seat is provided with a first positioning area, a second positioning area and a third positioning area from top to bottom. A first expansion sleeve is provided between the first positioning area and the outer seat, which abuts against the inner wall of the first positioning area and the outer seat respectively. The second positioning area and the outer seat are interference-fitted. The outer diameter of the third positioning area gradually decreases from top to bottom. The third positioning area is interference-fitted with the outer seat, and the outer diameters of the first positioning area and the second positioning area are not greater than the outer diameter of the third positioning area.

2. The spindle mounting and lubrication mechanism according to claim 1, characterized in that, The first positioning area and the second positioning area are located near the top of the inner seat, and the third positioning area is located near the bottom of the inner seat; and / or, a wedge is provided between the third positioning area and the inner wall of the outer seat, which respectively abut against the third positioning area and the outer seat and form a conical fit.

3. The spindle mounting and lubrication mechanism according to claim 1, characterized in that, There is a gap between the outer side of the inner seat and the outer seat in the area between the first positioning area and the second positioning area.

4. A sand making machine with a wear-resistant rotor, characterized in that, The sand making machine includes the main shaft mounting and lubrication mechanism as described in any one of claims 1-3. The sand making machine includes a machine body, which includes an upper machine body and a lower machine body arranged from top to bottom. The upper machine body and the lower machine body abut against each other, and a sealing element is provided at the joint between the upper machine body and the lower machine body. Alternatively, one side of the bottom end of the upper machine body is rotatably connected to one side of the top end of the lower machine body, and the other side of the bottom end of the upper machine body abuts against the other side of the top end of the lower machine body.

5. The sand making machine according to claim 4, characterized in that, The machine body has a first cavity, and the machine body is provided with a feed inlet and a discharge outlet communicating with the first cavity; a turntable is detachably fixedly sleeved on the first end of the main shaft, and a first driving device for driving the main shaft to rotate is connected to the second end of the main shaft; a second expansion sleeve is provided between the main shaft and the turntable, respectively abutting against the main shaft and the turntable; the turntable has a second cavity, and a first inlet is provided on the end of the turntable facing the feed inlet, respectively directly communicating with the feed inlet and the second cavity; the turntable is provided with a plurality of discharge outlets respectively communicating with the first cavity and the second cavity.

6. The sand making machine according to claim 5, characterized in that, The turntable includes a first disc body and a second disc body arranged from top to bottom and connected together. A second cavity is formed between the first disc body and the second disc body. The first feed port is located at the top of the first disc body. The discharge port is located between the first disc body and the second disc body and is arranged towards the side wall of the machine body. The top of the second disc body is provided with a bearing area for carrying materials so as to form a third material liner.

7. The sand making machine according to claim 6, characterized in that, The turntable is provided with a protective bar, which is slidably connected to the turntable in the vertical direction. The downward force exerted by the material on the protective bar is greater than the upward force. The discharge port is formed between the protective bar and the first and second disc bodies. The protective bar has a symmetrical structure.

8. The sand making machine according to claim 5, characterized in that, The turntable has several protective bars that are detachably fixed to its outer side along its circumference; and / or, the turntable has several protective plates that are detachably fixed to its inner wall.

9. The sand making machine according to claim 5, characterized in that, The sand making machine also includes a guide plate, which is located in the first cavity, spaced apart from the turntable, and positioned on the side of the turntable closer to the machine body. A first support plate is provided in the first cavity below the guide plate. The guide plate is fixedly connected to the side wall of the machine body and / or the first support plate. The guide plate, the first support plate, and the side wall of the machine body form a first receiving area that communicates with the discharge port. A second receiving area that communicates with the discharge port is formed between the end of the first support plate away from the machine body and the side of the guide plate away from the machine body. The first receiving area and the second receiving area are used to receive and store materials.

10. The sand making machine according to claim 5, characterized in that, The feed inlet is located directly above the first feed port, and there is a gap between the feed inlet and the first feed port; Alternatively, a material blocking curtain and a feeding hopper are sequentially arranged between the feed inlet and the first feed outlet in the direction from the feed inlet toward the first feed outlet. The feeding hopper is connected to the first feed outlet. The first end of the material blocking curtain is connected to the area of ​​the machine body corresponding to the feed outlet. The second end of the material blocking curtain abuts against the inner or outer side of the feeding hopper. The second end of the material blocking curtain is subjected to a first force, which is directed from the material blocking curtain toward the feeding hopper. When a set amount of material overflows from the feeding hopper, the overflowing material exerts a second force on the second end of the material blocking curtain away from the feeding hopper. The second force is greater than the first force and is in the opposite direction to the first force.

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