Electric polishing spindle integrated with real-time pressure feedback system

Abstract

The utility model provides a polishing motorized spindle integrated with a real-time pressure feedback system, relates to the technical field of machine tool equipment, and aims to solve the problems that the conventional motorized spindle cannot meet the requirement of constant-pressure polishing in occasions of optical elements with aspheric revolution surfaces and free-form surfaces, and the precision of the final optical elements is influenced. The device comprises an electric spindle assembly, an encoder assembly and a pressure feedback assembly, a flexible clamp is fastened at the left end of a motor shaft, an encoder stator matched with an encoder rotor is fastened on the inner wall of an encoder cover through a screw, and the pressure feedback assembly comprises a hollow core shaft arranged in the motor shaft in a sleeved mode. An air inlet flange is fastened on the peripheral wall of the extending part of the mandrel, and a pressure sensor is fastened at the right end of the plunger through a screw. The constant-pressure polishing device has the advantages that a small fluctuation value of the internal pressure of the flexible clamp at the tail end can be guaranteed, and constant-pressure polishing is met; reliability is high and service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to machine tool equipment technical field, concretely relates to a polishing motor spindle of integrated real -time pressure feedback system. BACKGROUND

[0002] At present, the motor spindle for flexible polishing machine tool on the market is all based on the position coordinate of machine tool plus fixed air pressure pneumatic floating chuck, but has certain use limitation in some non-spherical rotary curved surface, free curved surface optical element occasions, mainly shows when the target curved surface and floating chuck have local interference and cannot avoid, the floating chuck will produce deformation to adapt to the target curved surface, thereby leading to pressure increase or decrease, thereby influence the precision of final optical element, therefore the market needs a kind of real-time monitoring pressure value and can real-time adjustment pneumatic floating chuck motor spindle. UTILITY MODEL CONTENTS

[0003] The utility model discloses a polishing motor spindle of integrated real -time pressure feedback system, which can realize constant pressure polishing in non-spherical rotary curved surface, free curved surface optical element occasions, and improve the precision of final optical element.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A polishing motor spindle of integrated real -time pressure feedback system, characterized by: including motor spindle assembly, encoder assembly and pressure feedback assembly;

[0006] The motor spindle assembly includes a hollow motor shaft, a flexible clamp is fastened to the left end of the motor shaft through a hydraulic expansion sleeve, an angular contact ball bearing is arranged on the outer peripheral wall of the motor shaft through interference fit, a bearing seat is fixedly connected to the outer peripheral wall of the angular contact ball bearing through clearance fit, a front end cover is fastened and connected to the left end of the bearing seat through screws, the front end cover is sleeved on the outer periphery of the motor shaft and presses the angular contact ball bearing, a motor rotor is fastened to the outer peripheral wall of the motor shaft on the right side of the angular contact ball bearing through holding glue, a motor stator is sleeved on the motor rotor, a liquid cooling shell is fastened to the outer peripheral wall of the motor stator through holding glue, a motor shell is fastened to the outer peripheral wall of the liquid cooling shell through clearance fit, the motor shell is fastened to the right end of the bearing seat through screws, a rear end cover is fastened to the right end of the motor shell through screws, and an auxiliary support deep groove ball bearing is arranged between the rear end cover and the outer peripheral wall of the motor shaft;

[0007] The encoder assembly includes an encoder rotor fixed to the outer peripheral wall of the right end of the motor shaft through a set screw, the right end of the rear end cover is fastened with an encoder cover through screws, and the inner wall of the encoder cover is fastened with an encoder stator matched with the encoder rotor through screws;

[0008] The pressure feedback assembly comprises a hollow mandrel sleeved in the motor shaft, the mandrel and the motor shaft are supported by the first deep groove ball bearing and the second deep groove ball bearing, the right end of the mandrel extends out of the mandrel, the outer peripheral wall of the extended part of the mandrel is fastened with an air inlet flange by screws, the air inlet flange is fastened to the inner side wall of the encoder cover by screws, the side wall of the air inlet flange is connected with an air pipe joint, a plunger is inserted in the middle of the right end of the mandrel, the right end of the plunger is fastened with a pressure sensor by screws, the pressure sensor is fastened with a pressure sensor support outside by screws, the pressure sensor support is fastened to the inner side wall of the encoder cover by screws, and the right end of the inner side wall of the encoder cover is fastened with a protective cover by screws.

[0009] Further improvement is that the flexible clamp is fastened in the left end of the hydraulic expansion sleeve through the expansion effect of the hydraulic expansion sleeve, and the right end of the hydraulic expansion sleeve is fastened in the left end of the motor shaft through the expansion effect of the hydraulic expansion sleeve.

[0010] Further improvement is that a dust seal is arranged between the right end inner wall of the bearing seat and the motor shaft, and the dust seal is fixed to the outer peripheral wall of the motor shaft through clearance fit.

[0011] Further improvement is that the left end of the angular contact ball bearing is tightly attached with a labyrinth seal cover through a precision bearing pre-tightening nut, the labyrinth seal cover is fitted with the outer peripheral wall of the motor shaft through clearance fit, the labyrinth seal cover is clamped with the right end inner wall of the front end cover, and the precision bearing pre-tightening nut and the labyrinth seal cover are located in the front end cover.

[0012] Further improvement is that first and second sealing rings are arranged between the left and right outer peripheral walls of the liquid cooling shell and the motor shell respectively.

[0013] Further improvement is that the auxiliary support deep groove ball bearing is fixed in the inner wall of the rear end cover through clearance fit.

[0014] Further improvement is that a pressure-resistant oil seal is arranged between the left end outer peripheral wall of the mandrel and the inner peripheral wall of the motor shaft.

[0015] Further improvement is that the pressure-resistant oil seal is fastened to the inner peripheral wall of the motor shaft through interference fit, and the pressure-resistant oil seal is matched with the outer peripheral wall of the mandrel through line contact friction.

[0016] After adopting the above technical scheme, the following beneficial effects are obtained compared with the existing technology:

[0017] The pressure sensor can measure in real time, and the pressure can be adjusted through the cooperation of the air inlet flange and the inner cavity of the mandrel, so as to ensure that the fluctuation value of the internal pressure of the flexible clamp at the end is small, and the blank of the conventional electric spindle on the market in some non-spherical rotary surface and free-form surface optical element occasions cannot meet the constant pressure polishing is filled;

[0018] The integrated mandrel is stationary, external interference factors are few, reliability is high, the mandrel and the plunger only have repeated movement actions, and service life is long. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0020] Figure 1 is a three-dimensional structure schematic diagram of the present application;

[0021] Figure 2 is a side structure schematic diagram of the present application;

[0022] Figure 3 is Figure 2 A-A sectional view structure schematic diagram in the present application.

[0023] Legend: 1-flexible clamp, 2-hydraulic expansion sleeve, 3-motor shaft, 4-precision bearing pre-tightening nut, 5-front end cover, 6-labyrinth seal cover, 7-first sealing ring, 8-bearing seat, 9-angular contact ball bearing, 10-motor shell, 11-liquid cooling shell, 12-motor stator, 13-motor rotor, 14-second sealing ring, 15-rear end cover, 16-encoder cover, 17-encoder stator, 18-protection cover, 19-pressure sensor support, 20-pressure sensor, 21-plunger, 22-air inlet flange, 23-air pipe joint, 24-mandrel, 25-first deep groove ball bearing, 26-encoder rotor, 27-dustproof ring, 28-second deep groove ball bearing, 29-pressure-resistant oil seal, 30-assisted support deep groove ball bearing. DETAILED DESCRIPTION

[0024] Referring to Figures 1-3 The technical scheme adopted in the present embodiment is: a polishing electric spindle integrated with a real-time pressure feedback system, comprising an electric spindle assembly, an encoder assembly and a pressure feedback assembly.

[0025] The electric spindle assembly comprises a hollow motor shaft 3, the left end of the motor shaft 3 is fastened with a flexible clamp 1 through a hydraulic expansion sleeve 3, the outer peripheral wall of the motor shaft 3 is provided with an angular contact ball bearing 9 through interference fit, the outer peripheral wall of the angular contact ball bearing 9 is fixedly connected with a bearing seat 8 through clearance fit, the left end of the bearing seat 8 is fastened with a front end cover 5 through a screw, the front end cover 5 is sleeved on the outer periphery of the motor shaft 3 and presses the angular contact ball bearing 9, the outer peripheral wall of the motor shaft 3 on the right side of the angular contact ball bearing 9 is fastened with a motor rotor 13 through holding glue, the motor rotor 13 is sleeved with a motor stator 12, the outer peripheral wall of the motor stator 12 is fastened with a liquid cooling shell 11 through holding glue, the outer peripheral wall of the liquid cooling shell 11 is fastened with a motor shell 10 through clearance fit, the motor shell 10 is fastened to the right end of the bearing seat 8 through a screw, the right end of the motor shell 10 is fastened with a rear end cover 15 through a screw, and an auxiliary support deep groove ball bearing 30 is arranged between the rear end cover 15 and the outer peripheral wall of the motor shaft 3.

[0026] The encoder assembly comprises an encoder rotor 26 fixed to the outer peripheral wall of the right end of the motor shaft 3 through a set screw, the right end of the rear end cover 15 is fastened with an encoder cover 16 through a screw, and the inner wall of the encoder cover 16 is fastened with an encoder stator 17 matched with the encoder rotor 26 through a screw.

[0027] The pressure feedback assembly comprises a hollow core shaft 24 sleeved in the motor shaft 3, the core shaft 24 and the motor shaft 3 are supported through a first deep groove ball bearing 25 and a second deep groove ball bearing 28, the right end of the core shaft 24 protrudes from the core shaft 24, the outer peripheral wall of the protruding part of the core shaft 24 is fastened with an air inlet flange 22 through a screw, the air inlet flange 22 is fastened to the inner side wall of the encoder cover 16 through a screw, the side wall of the air inlet flange 22 is connected with an air pipe joint 23, the right end of the core shaft 24 is inserted with a plunger 21, the right end of the plunger 21 is fastened with a pressure sensor 20 through a screw, the outer periphery of the pressure sensor 20 is fastened with a pressure sensor support 19 through a screw, the pressure sensor support 19 is fastened to the inner side wall of the encoder cover 16 through a screw, the right end of the inner side wall of the encoder cover 16 is fastened with a protective cover 18, and the direction of the arrow is the line of air inlet.

[0028] Wherein, the flexible clamp 1 is fastened in the left end of the hydraulic expansion sleeve 3 through the expansion effect of the hydraulic expansion sleeve 2, and the right end of the hydraulic expansion sleeve 3 is fastened in the left end of the motor shaft 3 through the expansion effect of the hydraulic expansion sleeve 3.

[0029] Wherein, a dustproof ring 27 is arranged between the right end inner wall of the bearing seat 8 and the motor shaft 3, and the dustproof ring 27 is fixed to the outer peripheral wall of the motor shaft 3 through clearance fit.

[0030] The left end of the angular contact ball bearing 9 is tightly attached with a labyrinth seal cover 6 through a precision bearing pre-tightening nut 4, the labyrinth seal cover 6 is sleeved with the outer peripheral wall of the motor shaft 3 through a clearance fit, the labyrinth seal cover 6 is clamped with the right end inner wall of the front end cover 5, and the precision bearing pre-tightening nut 4 and the labyrinth seal cover 6 are located in the front end cover 5.

[0031] The first sealing ring 7 and the second sealing ring 14 are arranged between the left and right outer peripheral walls of the liquid cooling shell 11 and the motor shell 10 respectively.

[0032] The auxiliary support deep groove ball bearing 30 is fixed to the inner wall of the rear end cover 15 through a clearance fit.

[0033] The pressure-resistant oil seal 29 is arranged between the left end outer peripheral wall of the mandrel 24 and the inner peripheral wall of the motor shaft 3.

[0034] The pressure-resistant oil seal 29 is fastened to the inner peripheral wall of the motor shaft 3 through an interference fit, and the pressure-resistant oil seal 29 is matched with the outer peripheral wall of the mandrel 24 through a line contact friction.

[0035] The working principle of the utility model is: when the electric spindle receives the driver speed instruction, the real-time position change rate of the encoder rotor is read through the encoder stator, and is fed back to the driver, the driver outputs the instruction current to the motor stator through the PID regulator, the motor stator generates the corresponding vector magnetic field and carries out electromagnetic force coupling with the motor rotor, the motor rotor rotates to drive the motor shaft to rotate and generate certain torque, when the flexible clamp receives the extrusion of the workpiece and causes the volume to change, the pressure change of the mandrel inner cavity will cause the corresponding micro displacement of the plunger, the pressure sensor receives the pressure signal caused by the plunger displacement and feeds back to the upper computer control system, the upper computer control system adjusts the inlet pressure to keep the pressure value of the flexible clamp at a very small fluctuation, so that better polishing effect is achieved, the pressure-resistant oil seal is added between the motor shaft and the mandrel, and the liquid cooling shell outside the electric spindle achieves water cooling effect, so that a good pressure-resistant space is formed, when the electric spindle runs at high speed, the mandrel keeps static state, so that only slight displacement state exists between the mandrel and the plunger from the structure, and the reliability of the air pressure measurement is ensured.

[0036] The basic principle and main features of the utility model and its advantages are shown and described above, and the person skilled in the art should understand that the utility model is not limited by the above examples, the above examples and the description in the description only illustrate the principle of the utility model, various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and their equivalents. The utility model is not described in detail, and is the known technology of the person skilled in the art.

Claims

1. An electric spindle for polishing integrated with a real-time pressure feedback system, characterized by: The electric spindle assembly, the encoder assembly and the pressure feedback assembly are provided. The electric spindle assembly comprises a hollow motor shaft, a flexible clamp is fastened to the left end of the motor shaft through a hydraulic expansion sleeve, an angular contact ball bearing is arranged on the outer wall of the motor shaft through interference fit, a bearing seat is fixedly connected to the outer wall of the angular contact ball bearing through clearance fit, a front end cover is fastened to the left end of the bearing seat through screws, the front end cover is sleeved on the outer wall of the motor shaft and presses the angular contact ball bearing, a motor rotor is fastened to the outer wall of the motor shaft on the right side of the angular contact ball bearing through holding glue, a motor stator is sleeved on the motor rotor, a liquid cooling shell is fastened to the outer wall of the motor stator through holding glue, a motor shell is fastened to the outer wall of the liquid cooling shell through clearance fit, the motor shell is fastened to the right end of the bearing seat through screws, a rear end cover is fastened to the right end of the motor shell through screws, and an auxiliary support deep groove ball bearing is arranged between the rear end cover and the outer wall of the motor shaft. The encoder assembly comprises an encoder rotor fixed to the outer wall of the right end of the motor shaft through a set screw, an encoder cover is fastened to the right end of the rear end cover through screws, and an encoder stator matched with the encoder rotor is fastened to the inner wall of the encoder cover through screws. The pressure feedback assembly comprises a hollow core shaft sleeved in the motor shaft, the core shaft and the motor shaft are supported through a first deep groove ball bearing and a second deep groove ball bearing, the right end of the core shaft protrudes from the core shaft, the outer wall of the protruding part of the core shaft is fastened to an air inlet flange through screws, the air inlet flange is fastened to the inner side wall of the encoder cover through screws, an air pipe joint is connected to the side wall of the air inlet flange, a plunger is inserted into the right end of the core shaft, a pressure sensor is fastened to the right end of the plunger through screws, the pressure sensor is fastened to a pressure sensor support through screws, the pressure sensor support is fastened to the inner side wall of the encoder cover through screws, and a protective cover is fastened to the right end of the inner side wall of the encoder cover through screws.

2. The electric spindle for polishing integrated with a real-time pressure feedback system according to claim 1, characterized in that: The flexible clamp is fastened in the left end of the hydraulic expansion sleeve through the expansion effect of the hydraulic expansion sleeve, and the right end of the hydraulic expansion sleeve is fastened in the left end of the motor shaft through the expansion effect of the hydraulic expansion sleeve.

3. The electric spindle for polishing integrated with a real-time pressure feedback system according to claim 1, characterized in that: A dustproof ring is arranged between the right end inner wall of the bearing seat and the motor shaft, and the dustproof ring is fixed to the outer wall of the motor shaft through clearance fit.

4. The electric spindle for polishing integrated with a real-time pressure feedback system according to claim 1, characterized in that: The left end of the angular contact ball bearing is tightly attached to a labyrinth seal cover through a precision bearing pre-tightening nut, the labyrinth seal cover is sleeved with the outer wall of the motor shaft through clearance fit, the labyrinth seal cover is clamped with the right end inner wall of the front end cover, and the precision bearing pre-tightening nut and the labyrinth seal cover are located in the front end cover.

5. The electric spindle for polishing integrated with a real-time pressure feedback system according to claim 1, characterized in that: First and second sealing rings are arranged between the left and right end outer walls of the liquid cooling shell and the motor shell.

6. The integrated real-time pressure feedback system's polishing motorized spindle of claim 1, wherein: The auxiliary support deep groove ball bearing is fixed to the inner wall of the rear end cover through clearance fit.

7. The integrated real-time pressure feedback system's polishing motorized spindle of claim 1, wherein: A pressure-resistant oil seal is arranged between the left end outer wall of the core shaft and the inner wall of the motor shaft.

8. The integrated real-time pressure feedback system's polishing motorized spindle according to claim 7, wherein: The pressure-resistant oil seal is fastened to the inner wall of the motor shaft through interference fit, and the pressure-resistant oil seal is matched with the outer wall of the core shaft through line contact friction.

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