CN108941624B

CN108941624B - Floating cylinder device

Info

Publication number: CN108941624B
Application number: CN201811009118.5A
Authority: CN
Inventors: 陈兴银; 许静; 陈兴成; 陈兴维; 邓霞
Original assignee: Foshan Shanneng Electromechanical Technology Co ltd
Current assignee: Foshan Shanneng Electromechanical Technology Co ltd
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2024-03-26
Anticipated expiration: 2038-08-31
Also published as: CN108941624A

Abstract

The invention provides a floating cylinder device, comprising: the outer cylinder body and the inner cylinder body that can float from top to bottom that is piled up by a plurality of piston components the lower part of inner cylinder body is connected with and is used for drawing the drawing dish of fixed dabber be provided with in the casing connect in the slot part and be used for controlling the first air flue of inner cylinder body down move be provided with in the center of back lid be used for the drive the piston moves down and the contact of tool changing pull rod carries out the second air flue of tool changing be provided with in the plug bush be used for control the piston is with the third air flue of tool changing pull rod separation, and the cylinder body come-up is driven through the air flue air inlet control in the tool changing and is drawn dish fixed dabber and bear partial bearing atress, has reduced the impact to the bearing when changing the sword, improves bearing life.

Description

Floating cylinder device

Technical Field

The invention relates to the field of motorized spindles, in particular to a floating cylinder device.

Background

The existing electric spindle is characterized in that a piston acts on a tool changing pull rod during tool changing, the tool changing pull rod is arranged in a mandrel, acting force of the piston on the tool changing pull rod is transmitted to the mandrel through the tool changing pull rod and then is transmitted to a bearing with a fixed mandrel, so that the bearing needs to bear impact during tool changing every time, and the service life of the bearing is reduced.

Accordingly, the prior art is still in need of improvement and development.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a floating cylinder device and aims to solve the technical problem that the service life of a bearing is shortened due to the fact that a mandrel is stressed greatly in the existing electric spindle tool changing process.

The technical scheme of the invention is as follows:

a floating cylinder device, comprising: the inner cylinder body is arranged in the outer cylinder body and is formed by stacking a plurality of piston assemblies, and the lower part of the inner cylinder body is connected with a pulling disc for pulling and fixing the rotor shaft core assembly; the outer side surface of the inner cylinder body is provided with an ear, the inner side surface of the outer cylinder body is provided with a groove part, and the ear is attached in the groove part and can float up and down along the groove part; the outer cylinder comprises a shell, a front cover and a rear cover, the piston assembly comprises a piston and a plug bush, the rotor shaft core assembly comprises a mandrel and a tool changing pull rod arranged inside the mandrel, a first air passage which is connected with the groove part and used for driving the lug to move downwards to control the inner cylinder to move downwards is arranged in the shell, a second air passage which is used for driving the piston to move downwards to contact with the tool changing pull rod to change a tool is arranged in the center of the rear cover, and a third air passage which is used for controlling the piston to separate from the tool changing pull rod is arranged in the plug bush.

The floating cylinder device is characterized in that the piston assembly is provided with 5 groups, the floating cylinder device sequentially comprises a first-stage piston assembly, a second-stage piston assembly, a third-stage piston assembly, a fourth-stage piston assembly and a pushing piston assembly from top to bottom, and a second air passage is formed in the centers of the pistons of the first-stage piston assembly, the second-stage piston assembly, the third-stage piston assembly and the fourth-stage piston assembly in an extending mode.

And the floating cylinder device is characterized in that sealing rings are arranged at the contact positions of the adjacent piston assemblies and the contact positions of the plug sleeves and the pistons.

The floating cylinder device is characterized in that the piston is a T-shaped piston, the T-shaped piston comprises a transverse top and a vertical shaft, the second air passage is arranged on the vertical shaft of the T-shaped piston, and a groove which is convenient for air storage to drive the inner cylinder body to float upwards is formed in the transverse top of the T-shaped piston.

The floating cylinder device is characterized in that a protruding block is arranged on the inner side face of the mandrel, a disc spring is sleeved on the tool changing pull rod, and the disc spring is in contact with the protruding block and used for recovering the tool changing pull rod after tool changing.

The beneficial effects are that: the invention provides a floating cylinder device, comprising: the outer cylinder body and the inner cylinder body that can float from top to bottom that is piled up by a plurality of piston components the lower part of inner cylinder body is connected with and is used for fixing the pulling plate of rotor axle core subassembly through drawing be provided with in the casing connect in the slot part and be used for the drive the ear moves down the control inner cylinder body moves down the first air flue of back lid be provided with be used for the drive the piston moves down and the second air flue of tool changing pull rod contact tool changing is carried out in the center of back lid be provided with in the plug bush be used for control the piston is with the third air flue of tool changing pull rod separation, and the cylinder body comes into contact with the upper floating drive pulling plate fixed rotor axle core subassembly through the air flue and bears partial bearing atress in the time of the tool changing, has reduced the impact to the bearing when changing the tool, improves bearing life.

Drawings

Fig. 1 is a schematic diagram of an exploded structure of an electric spindle system according to the present invention.

Fig. 2 is a schematic cross-sectional view of an electric spindle system according to the present invention.

Fig. 3 is a schematic cross-sectional view of a floating cylinder device of an electric spindle system according to the present invention.

Fig. 4 is a schematic cross-sectional view of a spindle motor apparatus of an electric spindle system according to the present invention.

Detailed Description

The invention provides a floating cylinder device, which is further described in detail below in order to make the purposes, technical schemes and effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1 and 2, an electric spindle system, comprising: a floating cylinder device 10 and a spindle motor device 20, wherein the floating cylinder device 10 comprises an outer cylinder body 30 and an inner cylinder body 40 which is arranged in the outer cylinder body and is formed by stacking a plurality of piston assemblies and can float up and down, the spindle motor device 20 comprises a stator housing assembly 50 and a rotor shaft core assembly 60 arranged in the stator housing assembly, and a nut 70 is arranged at the upper part of the rotor shaft core assembly 60; referring to fig. 3, a pull disc 80 for fixing the rotor shaft core assembly by pulling the nut is connected to the lower portion of the inner cylinder 40, an ear portion 90 is provided on the outer side surface of the inner cylinder 40, a groove portion 100 is provided on the inner side surface of the outer cylinder 30, and the ear portion is fitted in the groove portion and can float up and down along the groove portion; referring to fig. 4, the rotor shaft core assembly 60 includes a mandrel 110 and a tool changing pull rod 120 disposed inside the mandrel, the nut is disposed on the mandrel, referring to fig. 3, the outer cylinder 30 includes a housing 130, a front cover 140 and a rear cover 150, the piston assembly includes a piston 160 and a plug bush 170, a first air passage 180 connected to the groove portion and used for driving the ear portion to move downward to control the inner cylinder body to move downward is disposed in the housing 130, and a second air passage 190 used for driving the piston to move downward to contact the tool changing pull rod to change a tool is disposed in the center of the rear cover 150; a third air passage 200 for controlling the separation of the piston and the tool changing pull rod is arranged in the plug sleeve 170.

The technical scheme is that an inner cylinder body capable of floating up and down is arranged in an outer cylinder body, a pulling disc for fixing a nut on a spindle of a rotor shaft core assembly is arranged at the lower part of the inner cylinder body, and part of spindle stress is borne by the pulling disc during tool changing, so that the impact on the bearing during tool changing is reduced, and the service life of the bearing is prolonged.

Specifically, when the floating cylinder electric spindle is used for changing a cutter, the combined action of the three air passages is used for realizing the cutter changing process, the second air passage in the center of the rear cover is used for air intake, the piston moves downwards, after the piston pushes the cutter changing pull rod below, the inner cylinder body moves upwards to drive the pull disc to pull the nut on the mandrel, the mandrel is fixed, the inner cylinder body floats to the highest position, and at the moment, the piston moves downwards continuously to push the cutter changing pull rod in the mandrel out, so that the cutter changing is realized.

After the tool changing is completed, a first air passage in the outer cylinder shell and a third air passage in the inner cylinder plug sleeve are used for air intake, wherein the first air passage is used for air intake to push the inner cylinder to move downwards integrally, a pull disc is separated from a nut on the mandrel, and the third air passage is used for air intake to push the piston to move upwards to be separated from the tool changing pull rod.

Referring to fig. 4, in a preferred embodiment, the outer side surface of the mandrel 110 is provided with a first step 210, a second step 220, a third step 230 and a fourth step 240, the shaft diameters of which gradually decrease from bottom to top, a lower end cover 250, a lower bearing 260 and a rotor 270 are respectively sleeved on the second step, the third step and the fourth step, the stator housing assembly 50 comprises a housing 280, an upper bearing 290 and a stator 300 are sequentially arranged in the housing from top to bottom, the mandrel is mounted in the housing through the lower part of the housing, and the lower end cover is arranged in a clearance with the second step and is fixedly connected to the housing without rotating along with the mandrel.

In order to facilitate installation, the shaft diameter of the lower end of the mandrel in the rotor shaft core assembly cannot be designed to be larger, and in order to achieve higher rotating speed of the mandrel, the diameter of the whole mandrel is required to be reduced, and because a tool changing pulling claw is arranged in an inner cavity of the lower end of the mandrel, the wall thickness of the mandrel is required to be reduced after the diameter of the lower end is reduced, and long-term tool changing operation is easy to lead the lower end of the mandrel to deform or crack. According to the invention, through the optimized design of the shaft core assembly structure, the step with gradually smaller shaft diameter is designed at the lower end of the mandrel for installing the lower end cover, the lower bearing and the rotor, and the installation structure for installing the shaft core assembly from the lower direction of the stator housing assembly is adopted, the arrangement of the step structure can strengthen the front end of the mandrel, so that the rotor shaft core assembly can still have long service life at higher rotating speed.

In a preferred embodiment, the first step extends outwardly with a dust cap 310. The dustproof end cover and the mandrel are integrally arranged, so that the firmness of the dustproof end cover is guaranteed, and damage to the motor caused by external dust particles entering the motor from the bottom of the motor can be effectively prevented.

In a preferred scheme, a first cover plate 320 and a second cover plate 330 are arranged in the housing at intervals, an upper bearing seat 340 is arranged between the first cover plate and the second cover plate, a ball sleeve 350 is arranged between the upper bearing seat and the housing, and the upper bearing is fixed in the housing through the upper bearing seat. Specifically, organism shell inside is provided with the convex shoulder, and first apron overlap joint is in convex shoulder position, and the top of first apron is provided with the bearing mount pad, certainly, in order to make things convenient for the installation and the taking out of bearing mount pad in organism shell be provided with the ball cover between bolster bearing housing and the shell, connect through the screw between first apron, bearing mount pad and the second apron.

Specifically, both ends of lower bearing are fixed through packing ring 360 and lower bearing lock nut 370 respectively, and the packing ring is used for fixed lower bearing inner race, is provided with the clearance between lower bearing lock nut and the engine block shell, and lower bearing outer lane leads to interference fit to be fixed at the engine block shell inner wall, and the clearance setting between packing ring and the lower end cover, the both ends of rotor are fixed through lower bearing lock nut 370 and rotor fixation nut 380 respectively, be provided with connecting bolt 390 between rotor and the lower bearing lock nut. The top of lower bearing lock nut is provided with the rotor, this rotor cover is established on the third ladder, because the rotor needs bear high rotational speed together with the dabber, in order to guarantee the joint strength of rotor, still carry out the bolt connection between lower bearing lock nut and rotor, of course also can adopt the mode of key connection to connect fixed rotor and lower bearing lock nut, engine body shell's lower part is provided with lower bearing installation cavity, this inner chamber upper portion inwards extends has spacing part, this spacing part is used for spacing lower bearing outer lane, prevent lower bearing and stator contact, preferably, lower bearing is provided with 2, and separates through the spacer between the adjacent lower bearing, prevent the stress concentration between the bearing.

In the preferred scheme, a pre-tightening spring is arranged between the second cover plate and the upper bearing seat. The bearing seat is pre-tightened to improve the rotation precision of the bearing and the rigidity of the support, and reduce the vibration of the shaft during working.

Referring to fig. 3, in a preferred embodiment, the piston assemblies are provided with 5 groups, and include a primary piston assembly 400, a secondary piston assembly 410, a tertiary piston assembly 420, a quaternary piston assembly 430 and a pushing piston assembly 440 sequentially from top to bottom, and the centers of the pistons of the primary piston assembly, the secondary piston assembly, the tertiary piston assembly and the quaternary piston assembly are extended and provided with a second air passage.

The piston assemblies are arranged in 5 groups, and because the single pushing piston assembly is limited by a small stress surface, the generated thrust is limited, and through stacking a plurality of piston assemblies, a first-stage piston assembly, a second-stage piston assembly, a third-stage piston assembly and a fourth-stage piston assembly are provided with second air passages in an extending mode, air is introduced into the inner cavities of the pistons to act on the upper end surfaces of the pistons, and the stress area of the bottom pushing piston assembly is increased by adopting the upper end surfaces of the plurality of pistons, so that a better thrust effect can be generated.

In the preferred scheme, in order to guarantee the holistic airtight nature of floating cylinder, the contact position of adjacent piston subassembly and the contact position of plug bush and piston all are provided with the sealing washer.

In the preferred scheme, the piston is T type piston, T type piston includes horizontal top and vertical shaft portion, the second air flue sets up on the vertical shaft portion of T type piston, be provided with the recess 450 that is convenient for gas storage to drive on the horizontal top of T type piston interior cylinder body reciprocates. Through setting up this recess, when the second air flue is admitted air, make things convenient for the gas to the both sides diffusion at the horizontal top of piston, pack the piston top fast, the quick come-up of cylinder body in the drive.

Referring to fig. 4, in a preferred embodiment, a bump 460 is disposed on the inner side surface of the mandrel, and a disc spring 470 is sleeved on the tool changing pull rod, where the disc spring contacts with the bump and is used for recovering the tool changing pull rod after tool changing. The lower end of the tool changing pull rod is provided with a pull claw for fixing a tool.

In summary, the floating cylinder device provided by the present invention includes: the outer cylinder body and the inner cylinder body that can float from top to bottom that is piled up by a plurality of piston components the lower part of inner cylinder body is connected with and is used for drawing the drawing dish of fixed dabber be provided with in the casing connect in the slot part and be used for controlling the first air flue of inner cylinder body down move be provided with in the center of back lid be used for the drive the piston moves down and the contact of tool changing pull rod carries out the second air flue of tool changing be provided with in the plug bush be used for control the piston is with the third air flue of tool changing pull rod separation, and the cylinder body come-up is driven through the air flue air inlet control in the tool changing and is drawn dish fixed dabber and bear partial bearing atress, has reduced the impact to the bearing when changing the sword, improves bearing life.

It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

1. A floating cylinder device, characterized by comprising: the inner cylinder body is arranged in the outer cylinder body and is formed by stacking a plurality of piston assemblies, and the lower part of the inner cylinder body is connected with a pulling disc for pulling and fixing the rotor shaft core assembly; the outer side surface of the inner cylinder body is provided with an ear, the inner side surface of the outer cylinder body is provided with a groove part, and the ear is attached in the groove part and can float up and down along the groove part; the outer cylinder body comprises a shell, a front cover and a rear cover, the piston assembly comprises a piston and a plug bush, the rotor shaft core assembly comprises a core shaft and a tool changing pull rod arranged in the core shaft, a first air passage which is connected with the groove part and used for driving the lug part to move downwards to control the inner cylinder body to move downwards is arranged in the shell, and a second air passage which is used for driving the piston to move downwards to contact with the tool changing pull rod to change tools is arranged in the center of the rear cover; a third air passage for controlling the separation of the piston and the tool changing pull rod is arranged in the plug sleeve;

the piston assembly is provided with 5 groups, and sequentially comprises a primary piston assembly, a secondary piston assembly, a tertiary piston assembly, a quaternary piston assembly and a pushing piston assembly from top to bottom, wherein the centers of the pistons of the primary piston assembly, the secondary piston assembly, the tertiary piston assembly and the quaternary piston assembly are extended and provided with a second air passage;

the contact positions of the adjacent piston assemblies and the contact positions of the plug sleeves and the pistons are provided with sealing rings;

the inner side surface of the mandrel is provided with a lug, the tool changing pull rod is sleeved with a disc spring, and the disc spring is contacted with the lug and used for recovering the tool changing pull rod after tool changing;

the outer side of the mandrel is sequentially provided with a first step, a second step, a third step and a fourth step with decreasing shaft diameters from bottom to top, wherein the outer side of the second step is sleeved with a lower end cover; the outer side of the third step is sleeved with a lower bearing, and the outer side of the fourth step is sleeved with a rotor;

the first step extends outwards to form a dustproof end cover.

2. The floating cylinder device of claim 1, wherein the piston is a T-shaped piston, the T-shaped piston comprises a transverse top and a vertical shaft, the second air passage is arranged on the vertical shaft of the T-shaped piston, and a groove for facilitating air storage to drive the inner cylinder body to float upwards is arranged on the transverse top of the T-shaped piston.