CN219263007U

CN219263007U - Dedicated transmission main shaft of heavy high-speed centrifuge

Info

Publication number: CN219263007U
Application number: CN202223568990.8U
Authority: CN
Inventors: 苏汝忠; 苏汝见
Original assignee: Shanghai Yixin Automation Equipment Co ltd
Current assignee: Shanghai Yixin Automation Equipment Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-27
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a special transmission main shaft for a heavy high-speed centrifugal machine, which relates to the technical field of centrifugal machine equipment and comprises a base, wherein the base is horizontally arranged; the flange plate is fixed above the base, and a threaded hole is formed in the center of the flange plate; the main shaft mechanism comprises a shaft sleeve and a shaft body; the shaft sleeve is arranged above the flange plate, the bottom end of the shaft sleeve is provided with an annular boss with external threads, the annular boss is in interference fit connection with the threads of the threaded holes, and the lower end face of the shaft sleeve, which is positioned at the outer side of the annular boss, is abutted against the top surface of the flange plate; the middle part of the shaft body is arranged in the shaft sleeve, and the shaft body and the shaft sleeve are coaxially arranged and are rotationally connected around the axial direction; the top of the shaft body is fixedly provided with a bearing ring which is positioned above the shaft sleeve and is supported and rotationally connected with the shaft sleeve through a plane bearing; the top end of the bearing ring is fixedly connected with the bottom of the centrifugal barrel of the centrifugal machine. The utility model solves the problems of poor pressure capability and easy bending of the main shaft of the traditional transmission main bearing, and is suitable for centrifuges with large capacity, heavy load and high rotating speed.

Description

Dedicated transmission main shaft of heavy high-speed centrifuge

Technical Field

The utility model relates to the technical field of centrifugal machine equipment, in particular to a special transmission main shaft for a heavy high-speed centrifugal machine.

Background

At present, the traditional vertical centrifugal machine has low loading capacity, the main shaft is easy to generate unstable operation under heavy load and high rotation speed operation, so that the machine is vibrated, and the main shaft is easier to bend or break. With the expansion of the application range of the centrifugal machine, the industrial fields of aviation, smelting and the like all present the technical requirements for the centrifugal machine transmission main shaft, which are suitable for heavy load and can stably run at high rotating speed.

Chinese patent (grant bulletin number CN204867335U, grant bulletin day 2015.12.16) discloses a vertical centrifugal casting machine, in which a centrifuge turntable is provided on a main shaft, and the centrifuge turntable is fixedly connected with the main shaft; the technical scheme that only the main shaft is used for directly supporting the turntable of the centrifugal machine is not suitable for heavy-load high-speed centrifugal operation, and the main shaft of the centrifugal machine is bent or broken under the condition of long-term heavy-load high-speed operation.

Therefore, how to provide a special transmission main shaft for a heavy-duty high-speed centrifuge, which has the characteristics of strong load capacity and good balance stability under high-speed operation is a problem to be solved by the technicians in the field.

Disclosure of Invention

In view of the above, the present utility model provides a transmission spindle dedicated for a heavy-duty high-speed centrifuge, which aims to solve the above technical problems.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the special transmission main shaft of heavy high-speed centrifuge is characterized by comprising

The base is horizontally arranged and provided with a through hole;

the flange plate is fixed above the base, the surface of the flange plate is horizontal, and a threaded hole is formed in the center of the flange plate;

the spindle mechanism comprises a shaft sleeve and a shaft body; the shaft sleeve is arranged on the flange plate, and the axial direction of the shaft sleeve is perpendicular to the disc surface of the flange plate; an annular boss with external threads axially extends from the end face of the bottom end of the shaft sleeve, and the annular boss is in interference fit connection with the threads of the threaded hole; the lower end face of the shaft sleeve, which is positioned at the outer side of the annular boss, is abutted with the top surface of the flange plate; the upper end of the shaft sleeve is provided with a plane bearing; the middle part of the shaft body is arranged in the shaft sleeve, the shaft body and the shaft body are coaxially arranged and are connected in a rotating way around the axial direction, a bearing ring is circumferentially fixed at the top of the shaft body, and the bearing ring is positioned above the shaft sleeve and is supported and connected with the shaft sleeve through the plane bearing in a rotating way; the top end of the pressure-bearing ring is fixedly connected with the bottom of the centrifugal barrel of the centrifugal machine.

According to the technical scheme, the spindle mechanism is fixedly connected with the base through the flange, the shaft sleeve of the spindle mechanism is in interference fit connection with the screw threads of the center of the flange through the annular boss with external threads at the bottom end of the shaft sleeve and the screw threads of the center of the flange (the interference fit connection of the screw thread connection structure can be realized through a hot assembly or cold assembly technology), the lower end face of the shaft sleeve, which is positioned outside the annular boss, is abutted against the top surface of the flange, so that the spindle mechanism is firmly connected with the flange and axially supported and positioned, and the spindle mechanism is firmly and fixedly positioned on the base; the shaft body of the spindle mechanism fixedly supports the centrifugal barrel of the centrifugal machine through the bearing ring at the top of the shaft body, all loads from the shaft body and the centrifugal barrel are borne by the supporting force of the bearing ring of the shaft body through the shaft sleeve, the bottom of the bearing ring is connected with the top of the shaft sleeve through the plane bearing, and the stable high-speed operation of the spindle is guaranteed while the bearing effect is achieved.

The main shaft mechanism can solve the problems that the traditional transmission main shaft has poor bearing capacity, the dynamic level and horizontal difference of the transmission main shaft are poor, a machine is easy to vibrate and the main shaft is easy to bend and break when the transmission main shaft runs at high speed under heavy load; the utility model is applicable to the application of centrifuges with large capacity, heavy load and high rotation speed.

As a further improvement of the above technical solution, the spindle mechanism further comprises a self-aligning bearing;

the self-aligning bearing comprises a first self-aligning bearing and a second self-aligning bearing; the middle part of the shaft body is a shaft body aligning section, the inner rings of the first aligning bearing and the second aligning bearing are respectively sleeved on the upper part and the lower part of the shaft body aligning section, and the outer ring is fixed with the inner side of the shaft sleeve; the first aligning bearing top end and the pressure ring bottom end are arranged at intervals.

The aligning bearing further ensures the stability of high-speed rotation of the main shaft mechanism and improves the dynamic flat transverse property of the centrifugal machine; the first aligning bearing top and the bearing ring bottom interval set up, and the bearing ring of the bearing body of first aligning bearing non-contact promptly can effectively avoid the pressure of heavy centrifugal material to the influence of axle body aligning function.

As a further improvement of the above technical solution, the spindle mechanism further includes a spindle body fastening assembly;

the shaft body fastening assembly comprises a top sleeve and a shaft body retaining nut; the shaft body corresponding to the lower part of the shaft sleeve is sequentially divided into a shaft body fastening section and a transmission connecting section from top to bottom, and the shaft body fastening section penetrates through the through hole of the base and extends downwards to the lower part of the base; the shaft body retaining nut is in threaded connection with the shaft body fastening section below the base;

the bottom end face of the shaft sleeve is provided with a bearing mounting groove, and the outer ring of the second aligning bearing is embedded in the bearing mounting groove; the top sleeve is sleeved on the shaft body fastening section, the top end of the top sleeve penetrates through the through hole of the base and is abutted to the bottom end of the inner ring of the second aligning bearing, and the bottom end of the top sleeve is abutted to the top end of the shaft body retaining nut. The shaft body fastening assembly can realize the axial fixation of the shaft body and does not influence the rotation of the shaft body around the shaft.

As a further improvement of the above technical solution, the spindle mechanism further includes a shaft body sealing assembly; the axial direction of the peripheral side surface of the bearing ring is sequentially provided with a sealing element assembling step and a plane bearing assembling step from top to bottom;

the shaft body sealing assembly comprises an upper sealing piece and a lower sealing piece, the upper sealing piece is sleeved at the sealing piece assembling step, the plane bearing is positioned at the plane bearing assembling step, and the lower end face of the plane bearing is abutted against the top end of the shaft sleeve; the lower sealing piece is sleeved at the top of the top sleeve and is positioned in the through hole of the base, and the top end of the lower sealing piece is abutted to the bottom end of the shaft sleeve. The shaft body sealing component can realize the sealing of the upper end and the lower end of the shaft body.

As a further improvement of the technical scheme, the shaft body fastening assembly further comprises a first annular retaining piece, wherein a first clamping block is arranged at the inner side end of the first annular retaining piece, and a plurality of first clamping claws are arranged at the outer side end of the first annular retaining piece; the first annular retaining piece is sleeved on the shaft body fastening section and is positioned between the top sleeve and the shaft body retaining nut;

the outer circle of the shaft body fastening section is provided with a first clamping block groove along the axial direction, the first clamping block can be axially and slidably embedded and installed in the first clamping block groove, the outer peripheral side of the shaft body retaining nut and the corresponding position of the first clamping jaw are provided with a plurality of first clamping jaw grooves along the axial direction, and the first clamping jaw can be axially and downwardly bent for 90 degrees and embedded in the first clamping jaw groove. The first annular retaining piece is clamped with the first clamping block groove of the shaft body through the first clamping block, so that the rotation of the first annular retaining piece around the shaft is limited, the first annular retaining piece can be clamped with the first clamping jaw groove of the retaining nut of the shaft body through the first clamping jaw, further the retaining nut of the shaft body is restrained and fixed in the rotation around the shaft, the looseness of the retaining nut of the shaft body caused by equipment vibration in the working process of the centrifugal machine can be prevented, and the axial stability of the shaft body of the spindle mechanism is further improved; the first clamping block can be embedded and installed in the first clamping block groove in an axial sliding mode, and convenient disassembly and assembly are achieved.

As a further improvement of the technical scheme, the main shaft mechanism further comprises a transmission wheel and a transmission wheel fastening assembly;

the outer diameter of the transmission connecting section is smaller than that of the shaft body fastening section; the driving wheel is sleeved at the upper end of the driving connecting section, and is in driving connection with the driving connecting section through a guide type flat key; the top end of the driving wheel is abutted to the bottom end of the shaft body fastening section;

the transmission wheel fastening assembly comprises a transmission wheel retaining nut, and the transmission wheel retaining nut is in threaded connection with the lower end of the transmission connecting section and can lock the transmission wheel; the driving wheel is in transmission connection with the output end of the driving motor. The driving wheel is limited by the driving wheel retaining nut and is axially fixed on the driving connecting section, and the driving connecting section of the driving wheel and the shaft body can realize convenient disassembly of the driving wheel and the shaft body through guide type flat key driving connection, so that the condition that the shaft body is damaged due to overlarge force for disassembling and assembling the driving wheel during disassembly and maintenance of the spindle mechanism is avoided.

As a further improvement of the above technical solution, the driving wheel fastening assembly further comprises a second annular retaining piece;

the inner side end of the second annular retaining piece is provided with a second clamping block, and the outer side end of the second annular retaining piece is provided with a plurality of second clamping claws; the second annular retaining piece is sleeved on the transmission connecting section and is positioned between the transmission wheel and the transmission wheel retaining nut; the transmission connecting section lower extreme excircle is gone up along the axial and is offered the second fixture block groove, just the second fixture block can be followed the axial slip embedding and install in the second fixture block groove, drive wheel stopping nut periphery side with the corresponding position of second jack catch is offered along the axial a plurality of second jack catch grooves, the second jack catch can be followed the axial and is buckled 90 degrees downwards and imbeds in the second jack catch groove.

The second annular retaining piece is clamped with a second clamping block groove of the shaft body through a second clamping block, so that the rotation of the second annular retaining piece around the shaft is limited, the second annular retaining piece can be clamped with a second clamping jaw groove of the driving wheel retaining nut through a second clamping jaw, further the driving wheel retaining nut is restrained and fixed in the rotation around the shaft, the loosening of the driving wheel retaining nut caused by equipment vibration in the working process of the centrifugal machine can be prevented, and the transmission stability of the spindle mechanism is further improved; the second fixture block can be embedded and installed in the second fixture block groove in an axial sliding mode, and convenient disassembly and assembly are achieved.

As a further improvement of the above technical solution, the spindle mechanism further includes a self-circulation lubrication system, where the self-circulation lubrication system includes a turbofan blade, an oil hole, a circulation main oil pipe, and a circulation oil distribution pipe;

a cavity is arranged between the middle part of the shaft body and the inner wall of the shaft sleeve; the turbofan blade is a spiral turbofan blade which is positioned in the cavity and is circumferentially arranged on the shaft body; the oil holes are symmetrically arranged at the upper end and the lower end of the inner wall of the shaft sleeve and are communicated with the cavity; the circulating main oil pipe is arranged in the shaft sleeve up and down along the axial direction, the number of the circulating oil distributing pipes is multiple, and the circulating main oil pipe is communicated with the oil holes, the plane bearing, the oil injection grooves of the first aligning bearing and the second aligning bearing or the oil injection holes through the circulating oil distributing pipes.

The special lubricating grease can be injected into the cavity, when the centrifugal machine works, the spiral turbofan blade which is fixedly installed on the shaft body in the cavity rotates along with the main shaft, the rotating turbofan blade in the cavity pushes the lubricating grease along the axial direction, so that the oil pressure difference is formed at the upper end and the lower end of the cavity, the lubricating grease at the high-pressure end of the cavity flows into the oil injection groove or the oil injection hole of each bearing of the main shaft mechanism through the circulating oil distribution pipe and the circulating main oil pipe and finally circulates back to the low-pressure end of the cavity, and the pressure and the flow of the circulating oil depend on the installation angle of the spiral turbofan blade and the running speed of the main shaft. The self-circulation lubrication system prolongs the sustainable working time of the spindle mechanism running at high speed, greatly reduces the workload of daily lubrication maintenance work, realizes the lubrication disassembly-free of the spindle mechanism, solves the problem of poor lubrication of the spindle body caused by long-term full-load operation, and avoids the damage of the positioning precision of the spindle body caused by frequent disassembly maintenance.

As a further improvement of the above technical solution, the top end of the shaft body has a cylindrical guiding and positioning boss for guiding and positioning the axis of the centrifugal barrel and the axis of the shaft body, the guiding and positioning boss is coaxial with the shaft body, and the top end of the guiding and positioning boss has a conical chamfer. The cylindrical guide positioning boss with the conical chamfer at the top is more beneficial to sleeving the center of the large centrifugal barrel into the center of the shaft body, the large centrifugal barrel body automatically slides down and corrects the center through the guide positioning boss under the action of gravity, the problem that the shaft body and the centrifugal barrel body are not concentric possibly caused in the assembly process of personnel is avoided, and the assembly precision of the heavy centrifugal barrel body and the main shaft mechanism is improved.

As a further improvement of the technical scheme, a plurality of reinforcing plates are fixedly connected to the outer side of the bottom of the shaft sleeve along the circumferential direction, and the bottom ends of the reinforcing plates are fixedly connected with the top ends of the flange plates. The reinforcing plate further improves the stability of the spindle mechanism, so that the stability of high-speed operation of the spindle mechanism is improved.

Compared with the prior art, the utility model discloses the special transmission main shaft for the heavy high-speed centrifugal machine, which has the following beneficial effects:

1. the utility model has strong load capacity and good dynamic balance performance under high-speed operation, and can solve the problems that the traditional transmission main shaft has poor bearing capacity, the dynamic level and horizontal difference, the machine is easy to vibrate and the main shaft is easy to bend and break when the heavy load is operated at high speed; the centrifugal machine is suitable for high-capacity, heavy-load and high-rotation-speed centrifugal machines.

2. According to the spindle mechanism, the spindle body and the driving wheel of the spindle mechanism are prevented from loosening in a mode that the annular retaining piece is used for carrying out axial rotation constraint fixing on the retaining nut, the retaining nut of the spindle body and the retaining nut of the driving wheel are convenient to assemble and disassemble, and the stability of the spindle mechanism in operation is further improved; the self-contained self-circulation lubrication system can improve the working stability and durability of the centrifugal machine.

3. The guide positioning boss at the top end of the shaft body is more beneficial to the automatic sliding of the large centrifugal barrel body and the correction of the center under the action of gravity, so that the problem that the shaft body and the centrifugal barrel body are not concentric possibly caused in the assembly process of personnel is avoided, the assembly precision of the heavy centrifugal barrel body and the main shaft mechanism is improved, and the stability of the high-speed operation of the centrifugal machine is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a drive spindle assembly for a heavy duty high speed centrifuge of the present utility model;

FIG. 2 is a schematic diagram of a spindle mechanism according to the present utility model;

FIG. 3 is a schematic view of a spindle structure of the spindle mechanism according to the present utility model;

FIG. 4 is a schematic view of a spindle sleeve structure of a spindle mechanism according to the present utility model;

FIG. 5 is a schematic view of the shaft seal assembly and self-aligning bearing of the spindle mechanism of the present utility model;

FIG. 6 is a schematic view of a shaft body fastening assembly of the spindle mechanism of the present utility model;

FIG. 7 is a schematic view of a first annular retaining tab of the shaft securing assembly of the present utility model;

FIG. 8 is a schematic diagram of a self-circulating lubrication system of the spindle mechanism of the present utility model;

FIG. 9 is a schematic top view of a spindle mechanism according to the present utility model;

FIG. 10 is a schematic view of the driving wheel fastening assembly of the spindle mechanism of the present utility model;

FIG. 11 is a schematic view of the structure of a second annular retaining tab in the drive wheel securing assembly of the present utility model;

wherein: 1. a base; 2. a flange plate; 21. a threaded hole; 3. a spindle mechanism; 31. a shaft sleeve; 311. an annular boss; 32. a shaft body; 321. a bearing ring; 322. a shaft body aligning section; 323. a shaft body fastening section; 3231. a first clamping block groove; 324. a transmission connection section; 3241. a second clamping block groove; 325. guiding and positioning the boss; 33. aligning the bearing; 331. a first aligning bearing; 332. a second aligning bearing; 34. a shaft seal assembly; 341. an upper seal; 342. a lower seal; 35. a shaft body fastening assembly; 351. a top sleeve; 352. a shaft body retaining nut; 3521. a first jaw groove; 353. a first annular stop tab; 3531. a first clamping block; 3532. a first claw; 36. a transmission wheel fastening assembly; 361. a driving wheel retaining nut; 3611. a second jaw groove; 362. a second annular stop tab; 3621. a second clamping block; 3622. a second claw; 37. a self-circulating lubrication system; 371. turbofan blades; 372. an oil hole; 373. circulating a main oil pipe; 374. circulating oil distributing pipes; 4. a driving wheel; 5. a cavity; 6. a reinforcing plate; 61. a rechargeable battery; 62. a power supply main switch; 63. a charging interface; 7. a centrifugal barrel; 8. a driving motor; 9. a planar bearing.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1-11, an embodiment of the present utility model discloses a transmission main shaft special for a heavy-duty high-speed centrifuge, comprising:

the base 1 is horizontally arranged, and a through hole is formed in the base 1;

the flange plate 2 is fixed at the top end of the bottom plate of the base 1 by bolts, the surface of the flange plate is horizontal, and the center of the flange plate is provided with a machined threaded hole;

a spindle mechanism 3, the spindle mechanism 3 including a shaft sleeve 31 and a shaft body 32;

the shaft sleeve 31 is arranged above the flange 2, and the axial direction of the shaft sleeve 31 is perpendicular to the disk surface of the flange 2; the bottom end of the shaft sleeve 31 is integrally connected with an annular boss 311 with external threads, the annular boss 311 is connected with a threaded hole 21 in the center of the flange plate through threaded interference fit, the interference fit connection of the shaft sleeve and the flange plate can be realized by adopting a hot-assembly or cold-assembly mode, and the lower end face of the shaft sleeve 31, which is positioned at the outer side of the annular boss 311, is abutted with the top surface of the flange plate 2;

the middle part of the shaft body 32 is arranged in the shaft sleeve 31, the shaft body and the shaft body are coaxially arranged and are rotationally connected around the axial direction, the shaft body is inserted from the top of the shaft sleeve during installation, the top of the shaft body 32 is provided with a bearing ring 321, the shaft body 32 and the bearing ring 321 are of an integrated structure, the bearing ring 321 is arranged above the shaft sleeve 31 and is vertically arranged at intervals with the top end of the shaft sleeve, a plane bearing 9 is arranged at the intervals, and the plane bearing 9 is arranged in a plane bearing installation groove recessed in the top end of the shaft sleeve 31; the top end of the bearing ring 321 is fixedly connected with the bottom of the centrifugal barrel 7 of the centrifugal machine through bolts.

The spindle mechanism is fixedly connected with the base through the flange, the shaft sleeve of the spindle mechanism is in interference fit connection with the screw threads of the screw holes in the center of the flange through the annular boss with external threads at the bottom end of the shaft sleeve (the interference fit connection of the screw connection structure can be realized through a hot assembly or cold assembly technology), the lower end face of the shaft sleeve, which is positioned outside the annular boss, is abutted against the top surface of the flange, so that the spindle mechanism is firmly connected with the flange and is axially supported and positioned, and further, the spindle mechanism is firmly fixed and positioned on the base in the vertical direction; the shaft body of the main shaft mechanism fixedly supports the centrifugal barrel of the centrifugal machine through the bearing ring at the top of the shaft body, all loads from the shaft body and the centrifugal barrel are borne by the supporting force of the bearing ring of the shaft body through the vertically fixed shaft sleeve, and the plane bearing arranged between the bottom of the bearing ring and the top of the shaft sleeve plays a role in bearing pressure and ensures stable high-speed operation of the main shaft; the main shaft mechanism can solve the problems that the traditional transmission main shaft has poor bearing capacity, the dynamic level and horizontal difference of the transmission main shaft are poor, a machine is easy to vibrate, and the main shaft is easy to bend and break when the transmission main shaft runs at high speed under heavy load; the utility model is applicable to the application of centrifuges with large capacity, heavy load and high rotation speed.

Preferably, the spindle mechanism 3 further comprises a self-aligning bearing 33; the self-aligning bearing 33 includes a first self-aligning bearing 331 and a second self-aligning bearing 332; the middle part of the shaft body 32 is a shaft body aligning section 322, and the first aligning bearing 331 and the second aligning bearing 332 are both positioned in aligning bearing mounting grooves in the shaft sleeve 31; the inner rings of the first aligning bearing 331 and the second aligning bearing 332 are respectively sleeved on the upper part and the lower part of the shaft aligning section 322, and the outer ring is tightly matched and fixed with the inner side of the shaft sleeve 31; the top end of the first aligning bearing 331 and the bottom end of the bearing ring 321 are arranged at intervals, and a gap of 2-5MM is reserved at the upper end of the first aligning bearing 331.

All the gravity of all materials, the dead weight pressure of the rotating centrifugal barrel 7 and other heavy loads are all conducted to the bottom of the plane bearing mounting groove at the top end of the shaft sleeve 31 through the plane bearing 9, and the plane bearing mounting groove is not in contact with the aligning bearing in the shaft sleeve, so that the aligning bearing can flexibly and freely run under any weight pressure, is not influenced by the impact pressure of external weight, and the clearance of 2-5MM can ensure the normal lubrication of the oil paths of the upper bearing and the lower bearing.

The aligning bearing further ensures the stability of high-speed rotation of the main shaft mechanism and improves the dynamic flat transverse property of the centrifugal machine; the top end of the first aligning bearing 331 and the bottom end of the bearing ring 321 are arranged at intervals, that is, the first aligning bearing 331 is not in contact with the bearing ring 321, so that the influence of the pressure of heavy centrifugal materials on the aligning function of the shaft body can be effectively avoided, and the bending deformation resistance of the shaft body is improved.

Preferably, the spindle mechanism 3 further comprises a spindle body fastening assembly 35; the shaft securing assembly 35 includes a top sleeve 351 and a shaft retaining nut 352; the shaft body 32 under the corresponding shaft sleeve 31 is sequentially divided into a shaft body fastening section 323 and a transmission connecting section 324 from top to bottom, wherein the shaft body fastening section 323 penetrates through the through hole of the base 1 and a part of the shaft body fastening section extends downwards to the lower part of the base 1; the shaft body fastening section 323 is provided with external threads matched with the shaft body retaining nut 352; the bottom end of the shaft sleeve 31 is provided with a self-aligning bearing mounting groove, and the outer ring of the second self-aligning bearing 332 is embedded in the self-aligning bearing mounting groove; the top sleeve 351 is sleeved on the shaft fastening section 323, the top end of the top sleeve penetrates through the through hole of the base 1 and is abutted against the bottom end of the inner ring of the second aligning bearing 332, and the bottom end of the top sleeve is abutted against the top end of the shaft retaining nut 352 which is connected with the shaft fastening section 323 in a threaded manner. The shaft body fastening assembly can realize the axial fixation of the shaft body and does not influence the rotation of the shaft body around the shaft.

Preferably, the spindle mechanism 3 further includes a shaft seal assembly 34; the axial direction of the peripheral side surface of the bearing ring 321 is provided with a sealing element assembling step and a plane bearing assembling step in sequence from top to bottom;

the shaft body sealing assembly 34 comprises an upper sealing element 341 and a lower sealing element 342, the upper sealing element 341 is sleeved at the sealing element assembling step, the lower end of the upper sealing element 341 is abutted to the top end of the shaft sleeve 31, and the shaft sleeve 31 and the bearing ring 321 are sealed; the plane bearing 9 arranged in the plane bearing mounting groove at the top end of the shaft sleeve 31 is sleeved at the plane bearing assembling step, the upper end of the plane bearing 9 is abutted against the bottom of the bearing ring 321, and the lower end of the plane bearing 9 is abutted against the bottom of the plane bearing mounting groove at the top end of the shaft sleeve 31; the lower sealing member 342 is located in the through hole of the base 1 and sleeved on the top of the top sleeve 351, and forms a tight sealing structure with the radial direction of the sleeve 351, and the top end of the lower sealing member abuts against the bottom end of the shaft sleeve 31, and forms a sealing structure with the bottom of the shaft sleeve 31. The sealing element is in the prior art, can be customized or purchased, and is not described in detail herein, and the shaft body sealing assembly can realize the sealing of the upper end and the lower end of the shaft body.

Preferably, the shaft body fastening assembly 35 further includes a first annular retaining piece 353, the inner side end of the first annular retaining piece 353 has a first clamping block 3531, and the outer side end has a plurality of first clamping jaws 3532; the first annular retaining piece 353 is sleeved on the shaft body fastening section 323 and is positioned between the top sleeve 351 and the shaft body retaining nut 352; the outer circle of the shaft body fastening section 323 is provided with a first clamping block groove 3231 along the axial milling process, the first clamping block 3531 can be axially and slidably embedded into the first clamping block groove 3231, the first clamping block 3531 is abutted against the side wall of the first clamping block groove 3231, namely, a clamping structure is formed along the circumferential direction of the shaft body 32, the outer side of the shaft body retaining nut 352 is provided with a plurality of first clamping jaw grooves 3521 along the axial direction at positions corresponding to the first clamping jaws 3532, the first annular retaining piece 353 is of a sheet structure made of metal, and the first clamping jaws 3532 can be axially and downwardly bent for 90 degrees to be embedded into the first clamping jaw grooves 3521. The first annular retaining piece is clamped with the first clamping block groove of the shaft body through the first clamping block, so that the rotation of the first annular retaining piece around the shaft is limited, the first annular retaining piece can be clamped with the first clamping jaw groove of the retaining nut of the shaft body through the first clamping jaw, further the retaining nut of the shaft body is restrained and fixed in the rotation around the shaft, the looseness of the retaining nut of the shaft body caused by equipment vibration in the working process of the centrifugal machine can be prevented, and the axial stability of the shaft body of the spindle mechanism is further improved; the first clamping block can be embedded and installed in the first clamping block groove in an axial sliding mode, and convenient disassembly and assembly are achieved.

Preferably, the spindle mechanism 3 further comprises a driving wheel 4 and a driving wheel fastening assembly 36; the drive wheel securing assembly 36 includes a drive wheel retaining nut 361; the outer diameter of the transmission connecting section 324 is smaller than that of the shaft body fastening section 323, namely a step structure exists at the joint of the transmission connecting section 324 and the shaft body fastening section 323; the upper end of the transmission connecting section 324 is sleeved with a transmission wheel 4, the top end of the transmission wheel 4 is abutted to the step at the bottom end of the shaft body fastening section 323, and the transmission wheel 4 is in transmission connection with the transmission connecting section 324 through a guide type flat key, so that flexible disassembly and assembly can be realized, and violent disassembly during maintenance is avoided; the lower end of the transmission connecting section 324 is provided with a thread structure matched with the driving wheel retaining nut 361; the bottom end of the driving wheel 4 is locked by a driving wheel retaining nut 361 which is connected with the driving connection section 324 through threads; the driving wheel 4 is in driving connection with the output end of the driving motor 8. The driving wheel is limited by the driving wheel retaining nut and is axially fixed on the driving connecting section, and the driving connecting section of the driving wheel and the shaft body can realize convenient disassembly of the driving wheel and the shaft body through guide type flat key driving connection, so that the condition that the shaft body is damaged due to overlarge force for disassembling and assembling the driving wheel during disassembly and maintenance of the spindle mechanism is avoided.

Preferably, the drive wheel securing assembly 36 further includes a second annular stop 362; the inner side end of the second annular retaining piece 362 is provided with a second clamping block 3621, and the outer side end is provided with a plurality of second clamping claws 3622; the second annular retaining piece 362 is sleeved on the transmission connecting section 324 and is positioned between the transmission wheel 4 and the transmission wheel retaining nut 361; the outer circle of the lower end of the transmission connecting section 324 is provided with a second clamping block groove 3241 in an axial milling mode, a second clamping block 3621 can be axially and slidably embedded into the second clamping block groove 3241, the outer side of the transmission wheel retaining nut 361 and the position corresponding to the second clamping jaw 3622 are provided with a plurality of second clamping jaw grooves 3611 in an axial milling mode, and the second clamping jaw 3622 can be axially and downwardly bent for 90 degrees to be embedded into the second clamping jaw groove 3611.

Specifically, the first annular retaining piece 353 and the second annular retaining piece 362 have the same structure but different sizes, and can be manufactured by stamping a thin steel plate.

Preferably, the spindle mechanism 3 further comprises a self-circulation lubrication system 37, wherein the self-circulation lubrication system 37 comprises a turbofan blade 371, an oil hole 372, a circulation main oil pipe 373 and a circulation oil distributing pipe 374;

a cavity 5 is arranged between the middle part of the shaft body 32 and the inner wall of the shaft sleeve 31, a turbofan sheet 371 is arranged in the cavity 5, and the turbofan sheet 371 is a spiral turbofan sheet and is circumferentially arranged on the outer circle of the shaft body 32 by using screws; the oil holes 372 are multiple (the number of the oil holes 372 can be specifically set according to the requirement), are symmetrically arranged at the upper end and the lower end of the inner wall of the shaft sleeve 31, and are communicated with the cavity 5; the circulating main oil pipe 373 is arranged in the shaft sleeve 31 up and down along the axial direction (two circulating main oil pipes can be symmetrically arranged relative to the axial direction), grooves can be processed on the inner wall or the outer wall of the shaft sleeve 31, and the circulating main oil pipe 373 is arranged in the grooves; the number of the circulating oil distributing pipes 374 is multiple, and the circulating main oil pipe 373 is communicated with the oil holes 372 and the oil injection grooves or the oil injection holes of the plane bearing 9, the first aligning bearing 331 and the second aligning bearing 332 through the circulating oil distributing pipes 374; the circulation distribution pipe 374 may be drilled radially in the sleeve 31, and the circulation distribution pipe 374 is disposed in the hole and made by welding to block the outer wall aperture of the sleeve 31.

Preferably, the top end of the shaft body 32 is provided with a cylindrical guiding and positioning boss 325 for guiding and positioning the shaft center of the centrifugal barrel 7 and the shaft center of the shaft body 32, the guiding and positioning boss 325 and the shaft body 32 are coaxial, and the top end is provided with a conical chamfer. The cylindrical guide positioning boss with the conical chamfer at the top is more beneficial to sleeving the center of the large centrifugal barrel into the center of the shaft body, the large centrifugal barrel body automatically slides down and corrects the center through the guide positioning boss under the action of gravity, the problem that the shaft body and the centrifugal barrel body are not concentric possibly caused in the assembly process of personnel is avoided, and the assembly precision of the heavy centrifugal barrel body and the main shaft mechanism is improved.

Preferably, a plurality of reinforcing plates 6 are fixedly connected to the outer side of the bottom of the shaft sleeve 31 along the circumferential direction, and the bottom ends of the reinforcing plates 6 are fixedly connected with the top ends of the flanges 2. The reinforcing plate further improves the stability of the spindle mechanism, so that the stability of high-speed operation of the spindle mechanism is improved.

The special transmission main shaft for the heavy high-speed centrifugal machine has strong load capacity and good dynamic balance performance under high-speed operation, and can solve the problems that the traditional transmission main shaft is poor in pressure bearing capacity, easy to shake in a machine table and easy to bend and break due to dynamic horizontal deviation when the heavy load is operated at high speed; is suitable for the application of centrifuges with large capacity, heavy load and high rotating speed,

the shaft body of the large-sized centrifugal machine is easy to cause two damages or influence the precision due to improper operation in the maintenance process, but the shaft body adopts a self-circulation maintenance-free structure, the maintenance of the inside of the shaft body is basically not needed, the assembly is not needed to be disassembled, and the maintenance is simple and convenient.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The special transmission main shaft of heavy high-speed centrifuge is characterized by comprising

The base (1) is horizontally arranged, and a through hole is formed in the base (1);

the flange (2) is fixed above the base (1), the surface of the flange is horizontal, and a threaded hole (21) is formed in the center of the flange;

a spindle mechanism (3), wherein the spindle mechanism (3) comprises a shaft sleeve (31) and a shaft body (32); the shaft sleeve (31) is arranged on the flange plate (2), and the axial direction of the shaft sleeve (31) is perpendicular to the disc surface of the flange plate (2); an annular boss (311) with external threads axially extends from the end surface of the bottom end of the shaft sleeve (31), and the annular boss (311) is in threaded interference fit connection with the threaded hole (21); the lower end face of the shaft sleeve (31) positioned outside the annular boss (311) is abutted with the top surface of the flange plate (2); the upper end of the shaft sleeve (31) is provided with a plane bearing (9); the middle part of the shaft body (32) is arranged in the shaft sleeve (31), the shaft body and the shaft sleeve are coaxially arranged and are connected in a rotating way around the axial direction, a bearing ring (321) is circumferentially fixed at the top of the shaft body (32), and the bearing ring (321) is positioned above the shaft sleeve (31) and is supported and connected with the shaft sleeve in a rotating way through the plane bearing (9); the top end of the pressure-bearing ring (321) is fixedly connected with the bottom of the centrifugal barrel (7) of the centrifugal machine.

2. A transmission spindle dedicated for heavy-duty high-speed centrifuges according to claim 1, characterized in that the spindle mechanism (3) further comprises a aligning bearing (33);

the self-aligning bearing (33) comprises a first self-aligning bearing (331) and a second self-aligning bearing (332); the middle part of the shaft body (32) is a shaft body aligning section (322), the inner rings of the first aligning bearing (331) and the second aligning bearing (332) are respectively sleeved on the upper part and the lower part of the shaft body aligning section (322), and the outer ring is fixed with the inner side of the shaft sleeve (31); the top end of the first aligning bearing (331) and the bottom end of the bearing ring (321) are arranged at intervals.

3. A transmission spindle for heavy duty high speed centrifuges according to claim 2, wherein said spindle mechanism (3) further comprises a spindle body fastening assembly (35);

the shaft body fastening assembly (35) comprises a top sleeve (351) and a shaft body retaining nut (352); the shaft body (32) corresponding to the lower part of the shaft sleeve (31) is sequentially divided into a shaft body fastening section (323) and a transmission connecting section (324) from top to bottom, and the shaft body fastening section (323) penetrates through the through hole of the base (1) and extends downwards to the lower part of the base (1); the shaft body retaining nut (352) is in threaded connection with the shaft body fastening section (323) below the base (1);

the bottom end surface of the shaft sleeve (31) is provided with a bearing mounting groove, and the outer ring of the second aligning bearing (332) is embedded and fixed in the bearing mounting groove; the top sleeve (351) is sleeved on the shaft body fastening section (323), the top end of the top sleeve penetrates through the through hole of the base (1) and is abutted to the bottom end of the inner ring of the second aligning bearing (332), and the bottom end of the top sleeve is abutted to the top end of the shaft body retaining nut (352).

4. A transmission spindle for heavy duty high speed centrifuges according to claim 3, wherein said spindle mechanism (3) further comprises a shaft body seal assembly (34); the axial direction of the peripheral side surface of the bearing ring (321) is sequentially provided with a sealing element assembling step and a plane bearing assembling step from top to bottom;

the shaft body sealing assembly (34) comprises an upper sealing element (341) and a lower sealing element (342), and the upper sealing element (341) is sleeved at the sealing element assembling step; the plane bearing (9) is positioned at the plane bearing assembling step, and the lower end face of the plane bearing is abutted against the top end of the shaft sleeve (31); the lower sealing piece (342) is sleeved at the top of the top sleeve (351) and is positioned in the through hole of the base (1), and the top end of the lower sealing piece is abutted to the bottom end of the shaft sleeve (31).

5. The transmission main shaft special for the heavy-duty high-speed centrifugal machine according to claim 4, wherein the shaft body fastening assembly (35) further comprises a first annular retaining piece (353), a first clamping block (3531) is arranged at the inner side end of the first annular retaining piece (353), and a plurality of first clamping claws (3532) are arranged at the outer side end of the first annular retaining piece; the first annular retaining piece (353) is sleeved on the shaft body fastening section (323) and is positioned between the top sleeve (351) and the shaft body retaining nut (352);

first fixture block groove (3231) has been seted up along the axial on the excircle of axis body fastening section (323), just first fixture block (3531) can be along the axial slip embedding install in first fixture block groove (3231), a plurality of first jack catch grooves (3521) have been seted up along the axial in axis body retaining nut (352) periphery side with first jack catch (3532) corresponding position, first jack catch (3532) can be followed the axial and 90 degrees embedding of buckling downwards in first jack catch groove (3521).

6. The transmission spindle special for heavy-duty high-speed centrifuges according to claim 5, wherein the spindle mechanism (3) further comprises a transmission wheel (4) and a transmission wheel fastening assembly (36);

the outer diameter of the transmission connecting section (324) is smaller than that of the shaft body fastening section (323); the driving wheel (4) is sleeved at the upper end of the driving connecting section (324), and the driving wheel (4) is in driving connection with the driving connecting section (324) through a guide type flat key; the top end of the driving wheel (4) is abutted to the bottom end of the shaft body fastening section (323);

the transmission wheel fastening assembly (36) comprises a transmission wheel retaining nut (361), and the transmission wheel retaining nut (361) is in threaded connection with the lower end of the transmission connecting section (324) and can lock the transmission wheel (4); the driving wheel (4) is in transmission connection with the output end of the driving motor (8).

7. The drive spindle for a heavy duty high speed centrifuge of claim 6, wherein said drive wheel securing assembly (36) further includes a second annular stop tab (362);

the inner side end of the second annular retaining piece (362) is provided with a second clamping block (3621), and the outer side end of the second annular retaining piece is provided with a plurality of second clamping claws (3622); the second annular retaining piece (362) is sleeved on the transmission connecting section (324) and is positioned between the transmission wheel (4) and the transmission wheel retaining nut (361); the transmission connecting section (324) is characterized in that a second clamping block groove (3241) is formed in the outer circle of the lower end of the transmission connecting section along the axial direction, a second clamping block (3621) can be axially and slidably embedded into the second clamping block groove (3241), a plurality of second clamping jaw grooves (3611) are formed in the positions, corresponding to the second clamping jaws (3622), of the outer peripheral side of the transmission wheel retaining nut (361), and the second clamping jaws (3622) can be axially and downwardly bent for 90 degrees to be embedded into the second clamping jaw grooves (3611).

8. The transmission main shaft special for the heavy-duty high-speed centrifugal machine according to claim 7, wherein the main shaft mechanism (3) further comprises a self-circulation lubrication system (37), and the self-circulation lubrication system (37) comprises a turbofan blade (371), an oil hole (372), a circulation main oil pipe (373) and a circulation oil distribution pipe (374);

a cavity (5) is arranged between the middle part of the shaft body (32) and the inner wall of the shaft sleeve (31); the turbofan blade (371) is a spiral turbofan blade which is positioned in the cavity (5) and is circumferentially arranged on the shaft body (32); the plurality of oil holes (372) are symmetrically arranged at the upper end and the lower end of the inner wall of the shaft sleeve (31) and are communicated with the cavity (5); the circulating main oil pipe (373) is arranged in the shaft sleeve (31) up and down along the axial direction, the circulating oil distributing pipes (374) are multiple, and the circulating main oil pipe (373) is communicated with the oil holes (372) and the oil injection grooves or the oil injection holes of the plane bearing (9), the first aligning bearing (331) and the second aligning bearing (332) through the circulating oil distributing pipes (374).

9. A transmission spindle for heavy duty high speed centrifuges according to any of claims 1 to 8, wherein the top end of the shaft body (32) has a cylindrical guiding and positioning boss (325) for guiding and positioning the shaft center of the centrifuge bowl coaxially with the shaft center of the shaft body (32), and the guiding and positioning boss (325) is coaxial with the shaft body (32) and has a tapered chamfer at the top end thereof.

10. The special transmission main shaft for the heavy-duty high-speed centrifugal machine according to claim 9, wherein a plurality of reinforcing plates (6) are fixedly connected to the outer side of the bottom of the shaft sleeve (31) along the circumferential direction, and the bottom ends of the reinforcing plates (6) are fixedly connected with the top ends of the flange plates (2).