CN214092765U

CN214092765U - Main shaft pre-compaction structure

Info

Publication number: CN214092765U
Application number: CN202022610720.3U
Authority: CN
Inventors: 卢永刚
Original assignee: Puyang Wansong Precision Machinery Co ltd
Current assignee: Puyang Wansong Precision Machinery Co ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-08-31
Anticipated expiration: 2030-11-12

Abstract

The utility model discloses a main shaft prepressing structure, which comprises a mandrel, a bearing seat and a shell, wherein the mandrel and the bearing seat are connected through a bearing and are fixed by a locking nut; the bearing seat is connected with the shell through a ball retainer, an upper spring seat, a compression spring and a lower spring seat; the shell is provided with two axial limiting end surfaces, one axial limiting end surface is used for limiting the axial offset of the ball steel ball retainer, and the other axial limiting end surface is directly contacted with the upper spring seat to serve as a compression surface of the compression assembly; the rear side of the bearing seat is provided with a flange-shaped radial extension which is used as a pressing end face to act on the lower spring seat; the interaction force generated by the compression spring indirectly acts on the shell and the mandrel; and an adjusting screw is arranged on the end face of the flange position of the bearing seat and is just opposite to the lower spring seat. The main shaft prepressing structure is flexible and adjustable, can effectively adjust the bearing prepressing force according to the actual operation condition, and ensures the reliable operation of the main shaft unit.

Description

Main shaft pre-compaction structure

Technical Field

The utility model relates to an abrasive machining technical field specifically is a main shaft pre-compaction structure.

Background

At present, with the continuous enhancement of the basic capability of the industry, the manufacturing level is obviously improved, more and more high-speed machine tools are applied to production, and particularly, the electric spindle unit plays a positive role in improving the production capability level of the machine tools.

The existing high-speed and high-precision electric spindle for grinding is elastically pre-pressed on a rear end bearing in order to avoid the influence of axial extension caused by temperature rise on the precision and rigidity of the spindle. The radial run-out of the main shaft under high-speed operation is effectively reduced. However, in the existing spindle pre-pressing structure, a compression spring with a certain specification is sealed at the rear end, and for the problems of temperature rise caused by overlarge bearing pre-pressing force and spindle precision reduction and insufficient rigidity caused by insufficient pre-pressing force in the spindle trial stage, a plurality of parts need to be disassembled again to change the specification of the compression spring so as to change the pre-pressing force, so that the debugging and performance stability of the spindle are adversely affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a nimble adjustable main shaft pre-compaction structure can carry out the effective regulation of bearing pre-compaction according to the actual running condition, has guaranteed the reliable operation of main shaft unit to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a main shaft prepressing structure comprises a mandrel, a bearing seat and a shell, wherein the mandrel and the bearing seat are connected through a bearing and are fixed by a locking nut; the mandrel and the bearing seat are respectively provided with a limiting end surface after the bearing is arranged; the bearing seat is connected with the shell through a ball retainer, an upper spring seat, a compression spring and a lower spring seat; the shell is provided with two axial limiting end surfaces, one axial limiting end surface is used for limiting the axial offset of the ball steel ball retainer, and the other axial limiting end surface is directly contacted with the upper spring seat to serve as a compression surface of the compression assembly; the rear side of the bearing seat is provided with a flange-shaped radial extension which is used as a pressing end face to act on the lower spring seat; the interaction force generated by the compression spring indirectly acts on the shell and the mandrel; and an adjusting screw is arranged on the end face of the flange position of the bearing seat and is just opposite to the lower spring seat.

Preferably, the compression assembly comprises an upper spring seat, a compression spring and a lower spring seat, and is connected into a non-dispersible whole by connecting screws after being formed, the side surface of the compression assembly directly acts by a certain number of uniformly distributed adjusting screws, and the adjusting screws are attached to the bearing seat.

Preferably, the upper spring seat and the lower spring seat are annular and provided with an equal matching seat hole, a screw hole for upper and lower fixation and a through hole.

Preferably, the ball steel ball retainer comprises a metal retainer and a steel ball, and the metal retainer and the steel ball jointly form a prepressing adjusting mechanism for the outer ring end face of the bearing at the rear end.

Preferably, the inner circle hole wall of the bearing seat is used for positioning the end face of the outer ring of the bearing, and the rear side is provided with internal threads and a locking spiral ring for carrying out bearing positioning prepressing.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the main shaft prepressing structure adopts the compression component module consisting of the upper spring seat, the compression springs and the lower spring seat, is convenient to disassemble and assemble, the distribution of pressure tends to be more uniform by a large number of springs, and the influence of overturning moment possibly brought by a small number of springs on the precision and the service life of a bearing is effectively avoided; the adjusting screw is arranged in the bearing seat, so that effective adjustment can be conveniently carried out according to mismatching of prepressing of the mandrel at different rotating speeds and in the assembling process, particularly, the rigidity and precision of the mandrel are reduced due to axial prepressing change after the mandrel runs for a long time, the processing quality of the mandrel is ensured, and the reliable operation of the spindle unit is ensured.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the compression assembly of the present invention;

FIG. 3 is an enlarged view of the compression assembly of the present invention;

fig. 4 is a schematic structural view of the bearing seat of the present invention;

fig. 5 is a side view of the present invention shown in fig. 4.

In the figure: 1. a mandrel; 2. a bearing; 3. locking the nut; 4. a bearing seat; 5. a ball retainer; 6. an upper spring seat; 7. a compression spring; 8. the lower spring seats are connected; 9. a housing; 10. and adjusting the screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-5, a spindle pre-pressing structure includes a mandrel 1, a bearing seat 4 and a housing 9, the mandrel 1 and the bearing seat 4 are connected by a bearing 2 and fixed by a lock nut 3; the mandrel 1 and the bearing seat 4 are respectively provided with a limiting end surface after the bearing 2 is arranged; the bearing seat 4 is connected with the shell 9 through a ball retainer 5, an upper spring seat 6, a compression spring 7 and a lower spring seat 8; two axial limiting end surfaces are arranged on the shell 9, one axial limiting end surface is used for limiting the axial offset of the ball steel ball retainer 5, and the other axial limiting end surface is directly contacted with the upper spring seat 6 to be used as a compression surface of the compression assembly; the rear side of the bearing seat 4 is provided with a flange-shaped radial extension which is used as a pressing end surface and acts on the lower spring seat 8; the interaction force generated by the compression spring 7 indirectly acts on the shell 9 and the mandrel 1; an adjusting screw 10 is arranged on the end face of the flange position of the bearing seat 4, the adjusting screw 10 is opposite to the lower spring seat 8, the absolute position of the bearing seat 4 on the pressure applying end face of the compression assembly is directly changed by screwing in and out the adjusting screw 10 at the flange position of the bearing seat 4, and the change of the compression amount of the compression spring 7 is also the change of the pre-pressure of the bearing 2.

In the above embodiment, the compression assembly is composed of an upper spring seat 6, a compression spring 7 and a lower spring seat 8, and is connected into an integral body which is not dispersed after being composed by a connecting screw, the side surface of the compression assembly is directly acted by a certain number of uniformly distributed adjusting screws 10, and the adjusting screws 10 are attached to the bearing seat 4.

In the above embodiment, the upper spring seat 6 and the lower spring seat 8 are formed in a ring shape, and are provided with the seating holes for the equal fitting, and the screw holes and the through holes for the vertical fixing.

In the above embodiment, the ball retainer 5 includes a metal retainer and a certain number of steel balls, and the metal retainer and the certain number of steel balls together form the outer ring end surface preload adjusting mechanism of the bearing 2 at the rear end.

In the above embodiment, the inner circular hole wall of the bearing seat 4 positions the outer circular end face of the bearing 2, the rear side is provided with the internal thread and the locking spiral ring to perform positioning prepressing on the bearing 2, the possibility of axial movement of the bearing 2 in the bearing seat 4 is eliminated, and the bearing 2 and the bearing seat 4 become an integral component without relative position change.

In the above embodiment, the upper spring seat 6, the lower spring seat 8 and a certain number of compression springs 7 form a pre-pressure generating assembly, and further, the pre-pressure generating assembly is connected by screws to form a spring distribution maintaining module, which particularly provides convenience for assembling and disassembling a large number of springs.

In the above embodiment, the outer circle of the bearing seat 4 is provided with a pressing end face, and together with the pressed end face on the housing 9, a certain amount of elastic deformation is generated on the compression spring 7, and further the compression spring 7 applies pre-pressure based on the deformation of the compression spring 7 to the whole body formed by the bearing seat 4 and the outer ring of the bearing 2.

In the above embodiment, a certain number of threaded through holes are distributed on the abutting end surface of the bearing seat 4, and the matched adjusting screws 10 are installed, and the position of the abutting end surface of the bearing seat 4 relative to the compression spring 7 module is determined by the screwing length of the adjusting screws 10.

In the above embodiment, the rear bearing in the bearing 2 and the bearing seat 4 form an integral component, and are connected with the housing 9 on the mandrel 1 through the ball retainer 5, and can perform axial relative sliding, so that the harmful stress caused by axial expansion and contraction generated in the operation process of the mandrel 1 is eliminated, the bearing seat 4 and the end surface of the housing 9 on the mandrel 1 are axially elastically connected through the compression spring 7, and the adjusting screw 10 on the bearing seat 4 can change the screwing amount and directly act on the compression spring 7.

In summary, the following steps: the main shaft prepressing structure adopts the compression component module consisting of the upper spring seat 6, the compression springs 7 and the lower spring seat 8, is convenient to disassemble and assemble, the distribution of pressure tends to be more uniform due to a large number of springs, and the influence of overturning moment on the precision and the service life of the bearing 2, which is possibly caused by fewer springs, is effectively avoided; the adjusting screw 10 is arranged in the bearing seat 4, so that effective adjustment can be conveniently carried out according to the mismatching of the prepressing forces of the mandrel 1 at different rotating speeds and in the assembling process, and particularly, the rigidity and the precision of the mandrel 1 caused by the axial prepressing change can be reduced for adjustment after the mandrel 1 runs for a long time, so that the processing quality of the mandrel 1 is ensured, and the reliable operation of the spindle unit is ensured.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a main shaft pre-compaction structure, includes dabber (1), bearing frame (4) and casing (9), its characterized in that: the mandrel (1) and the bearing seat (4) are connected through a bearing (2) and fixed by a locking nut (3); the mandrel (1) and the bearing seat (4) are respectively provided with a limiting end surface after the bearing (2) is arranged; the bearing seat (4) is connected with the shell (9) through a ball retainer (5), an upper spring seat (6), a compression spring (7) and a lower spring seat (8); two axial limiting end surfaces are arranged on the shell (9), one axial limiting end surface is used for limiting the axial offset of the ball steel ball retainer (5), and the other axial limiting end surface is directly contacted with the upper spring seat (6) to be used as a compression surface of the compression assembly; the rear side of the bearing seat (4) is provided with a flange-shaped radial extension which is used as a pressing end surface and acts on the lower spring seat (8); the interaction force generated by the compression spring (7) indirectly acts on the shell (9) and the mandrel (1); and an adjusting screw (10) is arranged on the end face of the flange position of the bearing seat (4), and the adjusting screw (10) is just opposite to the lower spring seat (8).

2. A main shaft prestressing structure according to claim 1, wherein: the compression assembly is composed of an upper spring seat (6), a compression spring (7) and a lower spring seat (8), and is connected into a whole body which cannot be dispersed after being composed by a connecting screw, the side surface of the compression assembly is directly acted by a certain number of uniformly distributed adjusting screws (10), and the adjusting screws (10) are attached to the bearing seat (4).

3. A main shaft prestressing structure according to claim 1, wherein: the upper spring seat (6) and the lower spring seat (8) are annular and are provided with equal matched seat holes, screw holes and through holes for upper and lower fixation.

4. A main shaft prestressing structure according to claim 1, wherein: the ball steel ball retainer (5) comprises a metal retainer and a steel ball, and the metal retainer and the steel ball jointly form a prepressing adjusting mechanism for the outer ring end face of the bearing (2) at the rear end.

5. A main shaft prestressing structure according to claim 1, wherein: the bearing seat (4) is characterized in that the inner circle hole wall is arranged on the end face of the outer ring of the bearing (2), and the rear side of the bearing seat is provided with internal threads and a locking spiral ring for positioning and prepressing the bearing (2).