CN214770346U

CN214770346U - Fixed-angle machining single-arm AC swing head directly driven by torque motor

Info

Publication number: CN214770346U
Application number: CN202023026929.1U
Authority: CN
Inventors: 赵岩; 祁立民; 孟祥宇; 刘医銞; 陈英杰; 舒小余; 任齐整
Original assignee: Ningbo Haitian Precision Machinery Co Ltd
Current assignee: Ningbo Haitian Precision Machinery Co Ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-11-19
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a decide angle processing single armed AC yaw that torque motor directly driven, including the headstock, the electricity main shaft, the box, A axle part and C axle part, A axle part includes A axle pivot bearing, A axle pivot bearing frame, A axle torque motor and A axle motor cabinet, C axle part includes C axle pivot bearing, C axle pivot bearing frame, C axle torque motor, C axle motor cabinet, C axle power shaft and cab apron, the right side of A axle pivot bearing frame is provided with A axle hydraulic braking system, A axle hydraulic braking system includes A axle brake disc, A axle clamping oil pocket and A axle brake block, the upside of box is provided with C axle hydraulic braking system, C axle hydraulic braking system includes C axle brake disc, C axle clamping oil pocket and C axle brake block. The AC swing head has a compact integral structure, and the C shaft can be more smoothly rotated; the swinging head can extend into a deep cavity for processing, and the electric spindle can be close to a workpiece for processing, so that the swinging head has larger processing space and better processing manufacturability.

Description

Fixed-angle machining single-arm AC swing head directly driven by torque motor

Technical Field

The utility model relates to a numerical control machining center accessory specifically is a fixed angle processing single armed AC yaw that torque motor directly driven.

Background

Five-axis linkage machining is a high pursuit of a numerical control machining center, a five-axis head directly driven by a torque motor has the inherent defects of high purchase cost and large size, the machining interference area on die parts is large, and particularly, a five-axis linkage high-end machining mode is rarely used for machining domestic parts.

CN108772715A discloses a single-pendulum direct-drive AC swing head, which comprises a main spindle box, an electric spindle, a cylindrical upper box body, a cylindrical lower box body, an A shaft part and a C shaft part, wherein the cylindrical upper box body and the cylindrical lower box body are arranged up and down; the electric spindle of the AC swing head is arranged in the spindle box, an A shaft and a C shaft of the electric spindle are driven by the torque motor, the eccentricity of the whole structure is low, the transposition of the C shaft is smoother, meanwhile, a lower box body of the A shaft part of the AC swing head and an A shaft turntable bearing are arranged on the same side of the spindle box, and the other side of the spindle box is not provided with a redundancy design, so that the electric spindle can be close to a workpiece for processing, and the swing head has larger processing space and better processing manufacturability. Although the AC swing head is beneficial to overcoming the defect of large five-axis head type, the A axis and the C axis of the AC swing head respectively adopt the pneumatic clamping system to tightly hold the A axis brake disc and the C axis brake disc, the A axis brake disc and the C axis brake disc can generate certain jitter during braking, and the whole size of the AC swing head is further reduced. For satisfying the high-speed electric main shaft 3+2 fixed angle processing requirement of most parts to make the structure of AC yaw compacter, small and exquisite, the utility model discloses improve CN108772715A, provide a fixed angle processing single armed AC yaw that torque motor directly driven.

Disclosure of Invention

The utility model aims to solve the technical problem that, to prior art not enough, provide a fixed angle processing single armed AC yaw that torque motor that the size is little, with low costs, application scope is wide, the manufacturability is good directly drives.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a torque motor direct-driven fixed-angle machining single-arm AC swing head comprises a spindle box, an electric spindle, a box body, an A-axis part and a C-axis part, wherein the center line of the A-axis part is perpendicular to the center line of the electric spindle, the center line of the C-axis part is parallel to the center line of the electric spindle, the electric spindle is vertically installed in the spindle box, the A-axis part is arranged in the box body and arranged on one side of the spindle box, and the C-axis part is arranged in the box body; the part A comprises an A-axis turntable bearing, an A-axis turntable bearing seat, an A-axis torque motor and an A-axis motor seat, wherein the inner ring of the A-axis turntable bearing is fixed on the A-axis turntable bearing seat, the outer ring of the A-axis turntable bearing seat is fixed on the box body, the A-axis turntable bearing seat is connected with a rotor of the A-axis torque motor through an A-axis connecting ring, the left end of the A-axis turntable bearing seat is fixed on the right side of the spindle box, the A-axis motor seat is fixed on the box body, a stator of the A-axis torque motor is fixed on the A-axis motor seat, and a protective cover is arranged on the right side of the box body; the C-axis part comprises a C-axis turntable bearing, a C-axis turntable bearing seat, a C-axis torque motor, a C-axis motor seat, a C-axis power shaft and a transition plate, the C-axis power shaft is fixed at the top end of the box body, the C-axis power shaft is fixedly connected with the upper end of a rotor of the C-axis torque motor through a C-axis connecting ring, the rotor of the C-axis torque motor is sleeved outside the C-axis power shaft, a stator of the C-axis torque motor is fixed on the C-axis motor seat, the transition plate is connected with the lower side of the stator of the C-axis torque motor in a centering manner, the transition plate is fixed on a machine tool ram, the C-axis turntable bearing seat is fixed at the upper end of the box body, the C-axis turntable bearing seat is connected with the lower side of the transition plate in a centering manner, the outer ring of the C-axis turntable bearing is fixed on the C-axis turntable bearing seat, The inner ring is fixed at the upper end of the box body, the upper end of the C-axis motor base is provided with an upper end cover, the top end of the C-axis power shaft extends out of the upper end cover, the right side of the A-axis turntable bearing seat is provided with an A-axis hydraulic braking system, the A-axis hydraulic braking system comprises an A-axis brake disc, an A-axis press ring, an A-axis clamping oil cavity and an A-axis brake sheet, the A-axis brake disc is sleeved and positioned on the A-axis turntable bearing seat and positioned on the right side of the A-axis turntable bearing, the A-axis press ring can be installed at the left end of the A-axis motor base in a left-right moving manner, the A-axis clamping oil cavity is arranged in the A-axis motor base and positioned on the right side of the A-axis press ring, an A-axis oil circuit communicated with the A-axis clamping oil cavity is arranged in the A-axis motor base, and the left side of the A-axis brake sheet is over against the right side of the A-axis brake disc, the axial inner side of the A-axis brake pad is fixed on the A-axis turntable bearing seat, and the axial outer side of the A-axis brake pad is over against the left side of the A-axis compression ring; the upside of box be provided with C axle hydraulic braking system, C axle hydraulic braking system include C axle brake disc, C axle clamping oil pocket and C axle brake block, C axle brake disc cover establish and fix a position the box on and be located the upside of box, C axle clamping ring can install with reciprocating the lower extreme of crossing the cab apron, C axle clamping oil pocket set up the cab apron in and be located the upside of C axle clamping ring, cross the cab apron in seted up with the communicating C axle oil circuit of C axle clamping oil pocket, the downside of C axle brake block just right the upside of C axle brake disc, the axial inboard of C axle brake block fix C axle power epaxially, the axial outside of C axle brake block just right the downside of C axle clamping ring.

The utility model discloses the fixed angle processing single armed AC yaw that torque motor directly drives adopts the structure of optimization, and it provides the required A axle torque motor of A/C diaxon transposition drive power and C axle torque motor can adopt less model specification to reduce the size of AC yaw, the A/C diaxon adopts A axle hydraulic brake system and C axle hydraulic brake system respectively to press from both sides tight location simultaneously, can further reduce the size and the manufacturing cost of AC yaw, thereby make the utility model discloses the application scope of AC yaw is wider.

The single-arm AC swinging head directly driven by the torque motor and processed at a fixed angle has compact integral structure, the spindle box is hidden in the box body, the eccentric phenomenon of the integral structure is small, and the C shaft can be more smoothly rotated; from the top down, shield the cab apron, the overall dimension of pendulum does not exceed phi 480mm, makes the pendulum head can stretch into deep cavity processing, and there is not redundant design in headstock left side simultaneously, and the electricity main shaft can be close to the work piece processing, makes the pendulum head have bigger processing space, better processing manufacturability.

A rotor of the A-axis torque motor provides indexing torque after being electrified, and an A-axis connecting ring drives a bearing seat of an A-axis turntable and a spindle box to rotate, so that an A-axis can be normally machined. When the A-axis oil circuit leads hydraulic oil to the A-axis clamping oil cavity, the A-axis pressure ring moves to the left under the action of the oil pressure, and the A-axis brake pad is pushed to the left to be contacted with the right surface of the A-axis brake disc, so that the A-axis braking action is completed; when the pressure of the clamping oil cavity of the shaft A returns to zero, the compression ring of the shaft A resets under the elasticity of the brake sheet of the shaft A.

The rotor of the C-axis torque motor provides indexing torque after being electrified, the C-axis power shaft and the A-axis part are driven to rotate through the C-axis connecting ring, and the C-axis can be normally processed. When the C-axis oil path leads hydraulic oil to the C-axis clamping oil cavity, the C-axis compression ring moves downwards under the action of the oil pressure to push the C-axis brake pad downwards to be in contact with the upper surface of the C-axis brake disc, and the C-axis braking action is finished; when the pressure of the C-axis clamping oil cavity returns to zero, the C-axis pressing ring resets under the elastic force of the C-axis brake pad.

Preferably, the bearing seat of the A-axis turntable comprises an integrally arranged A-axis first step shaft, an A-axis second step shaft and an A-axis third step shaft, the A-axis first step shaft, the A-axis second step shaft and the A-axis third step shaft are sequentially and coaxially arranged from left to right, the outer diameters of the A-axis first step shaft, the A-axis second step shaft and the A-axis third step shaft are sequentially reduced, and a first step hole, a second step hole and a third step hole which are sequentially and coaxially arranged from left to right and communicated with each other are sequentially increased in diameter are formed in the box body; the inner ring of the A-axis turntable bearing is fixed on the A-axis first step shaft, the outer ring of the A-axis turntable bearing is installed in the first step hole, the A-axis connecting ring is connected with the A-axis second step shaft in a centering mode, the left end and the right end of the A-axis connecting ring are respectively fixed on the A-axis turntable bearing seat and a rotor of the A-axis torque motor, the A-axis brake disc is fixed in the second step hole, the A-axis motor seat is fixed in the third step hole, the A-axis third step shaft is connected with an A-axis encoder in a centering mode, the A-axis encoder is installed on the A-axis encoder seat, and the A-axis encoder seat is fixed on the A-axis motor seat.

Preferably, a protective sleeve is fixed on the A-axis encoder seat and is positioned on the right side of the rotor of the A-axis torque motor.

Preferably, the bearing seat of the A-axis turntable is fixedly provided with a first pressure plate and a second pressure plate through screws, the first pressure plate and the second pressure plate are respectively connected to the outer side of the first step shaft of the A-axis in a centering manner, and the axial inner side of the A-axis brake pad is fixedly pressed between the first pressure plate and the second pressure plate.

Preferably, the C-axis power shaft comprises a C-axis first step shaft, a C-axis second step shaft, a C-axis third step shaft, a C-axis fourth step shaft and a C-axis fifth step shaft which are integrally arranged, the C-axis first step shaft, the C-axis second step shaft, the C-axis third step shaft, the C-axis fourth step shaft and the C-axis fifth step shaft are sequentially coaxially arranged from bottom to top and have sequentially reduced outer diameters, the C-axis first step shaft is connected with a square centering hole at the upper end of the box body, a rotor of the C-axis torque motor is installed on the C-axis second step shaft, a C-axis connecting ring is installed on the C-axis third step shaft, a C-axis encoder is connected to the C-axis fourth step shaft in a centering manner, an inner hole of the C-axis encoder is reversely fixed at the lower side of the upper end cover, and a centering sealing cover is connected to the upper end cover, and a deep groove ball bearing is arranged between the sealing cover and the fifth step shaft of the C shaft.

Preferably, a third pressure plate and a fourth pressure plate are fixed on the C-axis power shaft through screws, the third pressure plate and the fourth pressure plate are respectively fixed on the outer side of the bottom of the C-axis second step shaft in a centering mode through rabbets, and the inner side of the C-axis brake pad in the axial direction is fixedly pressed between the third pressure plate and the fourth pressure plate.

Preferably, a first transverse wiring hole is formed in the bearing seat of the A-axis turntable, a second transverse wiring hole and a third longitudinal wiring hole are formed in the inner side of the upper portion of the box body, a fourth longitudinal wiring hole is formed in the C-axis power shaft, the second wiring hole, the third wiring hole and the fourth wiring hole are sequentially communicated, and the first wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole form a wiring hole path of a cable and a functional pipe required by the electric spindle.

Compared with the prior art, the utility model has the advantages of as follows: the single-arm AC swinging head directly driven by the torque motor and processed at a fixed angle has compact integral structure, the spindle box is hidden in the box body, the eccentric phenomenon of the integral structure is small, and the C shaft can be more smoothly rotated; from the top down, shield the cab apron, the overall dimension of pendulum does not exceed phi 480mm, makes the pendulum head can stretch into deep cavity processing, and there is not redundant design in headstock left side simultaneously, and the electricity main shaft can be close to the work piece processing, makes the pendulum head have bigger processing space, better processing manufacturability.

Drawings

FIG. 1 is a schematic structural diagram of a fixed-angle processing single-arm AC swing head directly driven by a torque motor in the embodiment;

FIG. 2 is an enlarged view taken at I in FIG. 1;

fig. 3 is an enlarged view of fig. 1 at II.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The torque motor direct-drive fixed-angle machining single-arm AC swing head of the embodiment 1 comprises a spindle box 1, an electric spindle 11, a box body 2, an A shaft part and a C shaft part, wherein the center line of the A shaft part is perpendicular to the center line of the electric spindle 11, the center line of the C shaft part is parallel to the center line of the electric spindle 11, the electric spindle 11 is vertically installed in the spindle box 1, the A shaft part is arranged in the box body 2 and arranged on one side of the spindle box 1, and the C shaft part is arranged in the box body 2; the shaft A part comprises a shaft A turntable bearing 31, a shaft A turntable bearing seat 32, a shaft A torque motor and a shaft A motor seat 34, the inner ring of the shaft A turntable bearing 31 is fixed on the shaft A turntable bearing seat 32, the outer ring of the shaft A turntable bearing seat is fixed on the box body 2, the shaft A turntable bearing seat 32 is connected with a rotor 331 of the shaft A torque motor through a shaft A shaft connecting ring 35, the left end of the shaft A turntable bearing seat 32 is fixed on the right side of the spindle box 1, the shaft A motor seat 34 is fixed on the box body 2, a stator 332 of the shaft A torque motor is fixed on the shaft A motor seat 34, and the right side of the box body 2 is provided with a protective cover 21; the C shaft part comprises a C shaft turntable bearing 41, a C shaft turntable bearing seat 42, a C shaft torque motor, a C shaft motor seat 44, a C shaft power shaft 45 and a transition plate 46, the C shaft power shaft 45 is fixed at the top end of the box body 2, the C shaft power shaft 45 is fixedly connected with the upper end of a rotor 431 of the C shaft torque motor through a C shaft connecting ring 47, the rotor 431 of the C shaft torque motor is sleeved at the outer side of the C shaft power shaft 45, a stator 432 of the C shaft torque motor is fixed on the C shaft motor seat 44, the transition plate 46 is connected with the lower side of the stator 432 of the C shaft torque motor in a centering way, the transition plate 46 is fixed on a machine tool ram (not shown in the figure), the C shaft turntable bearing seat 42 is fixed at the upper end of the box body 2, the C shaft turntable bearing seat 42 is connected with the lower side of the transition plate 46 in a centering way, the outer ring of the C shaft turntable bearing 41 is fixed on the C shaft turntable bearing seat 42, and the inner ring is fixed at the upper end of the box body 2, an upper end cover 48 is arranged at the upper end of the C-axis motor seat 44, the top end of the C-axis power shaft 45 extends out of the upper end cover 48, an A-axis hydraulic braking system is arranged on the right side of the bearing seat 32 of the A-axis turntable, the A-axis hydraulic braking system comprises an A-axis brake disc 51 and an A-axis pressure ring 52, the A-shaft clamping oil cavity 53 and an A-shaft brake pad 54, the A-shaft brake disc 51 is sleeved and positioned on the A-shaft turntable bearing seat 32 and is positioned on the right side of the A-shaft turntable bearing 31, the A-shaft pressing ring 52 can be installed at the left end of the A-shaft motor seat 34 in a left-right moving mode, the A-shaft clamping oil cavity 53 is formed in the A-shaft motor seat 34 and is positioned on the right side of the A-shaft pressing ring 52, an A-shaft oil way 55 communicated with the A-shaft clamping oil cavity 53 is formed in the A-shaft motor seat 34, the left side of the A-shaft brake pad 54 is opposite to the right side of the A-shaft brake disc 51, the axial inner side of the A-shaft brake pad 54 is fixed on the A-shaft turntable bearing seat 32, and the axial outer side of the A-shaft brake pad 54 is opposite to the left side of the A-shaft pressing ring 52; the upper side of the box body 2 is provided with a C-axis hydraulic braking system, the C-axis hydraulic braking system comprises a C-axis brake disc 61, a C-axis pressing ring 62, a C-axis clamping oil cavity 63 and a C-axis brake pad 64, the C-axis brake disc 61 is sleeved and positioned on the box body 2 and positioned on the upper side of the box body 2, the C-axis pressing ring 62 can be mounted at the lower end of the transition plate 46 in a vertically moving mode, the C-axis clamping oil cavity 63 is arranged in the transition plate 46 and positioned on the upper side of the C-axis pressing ring 62, a C-axis oil path 65 communicated with the C-axis clamping oil cavity 63 is formed in the transition plate 46, the lower side of the C-axis brake pad 64 is opposite to the upper side of the C-axis brake disc 61, the axial inner side of the C-axis brake pad 64 is fixed on the C-axis power shaft 45, and the axial outer side of the C-axis brake pad 64 is opposite to the lower side of the C-axis pressing ring 62.

In embodiment 1, a transverse first wire hole 36 is formed in the bearing seat 32 of the a-axis turntable, a transverse second wire hole 22 and a longitudinal third wire hole 23 are formed in the inner side of the upper portion of the box body 2, a longitudinal fourth wire hole 49 is formed in the C-axis power shaft 45, the second wire hole 22, the third wire hole 23 and the fourth wire hole 49 are sequentially communicated, and the first wire hole 36, the second wire hole 22, the third wire hole 23 and the fourth wire hole 49 form a wire hole path of a cable and a functional pipe required by the electric spindle 11.

The torque motor direct-drive fixed-angle machining single-arm AC swing head of the embodiment 2 is different from the torque motor direct-drive fixed-angle machining single-arm AC swing head of the embodiment 1 in that in the embodiment 2, an A shaft turntable bearing seat 32 comprises an A shaft first step shaft 71, an A shaft second step shaft 72 and an A shaft third step shaft 73 which are integrally arranged, the A shaft first step shaft 71, the A shaft second step shaft 72 and the A shaft third step shaft 73 are coaxially arranged in sequence from left to right and the outer diameters of which are sequentially reduced, and a first step hole 24, a second step hole 25 and a third step hole 26 which are coaxially arranged in sequence from left to right and communicated with each other and the diameters of which are sequentially increased are arranged in a box body 2; an inner ring of the A-axis turntable bearing 31 is fixed on the A-axis first step shaft 71, an outer ring of the A-axis turntable bearing 31 is installed in the first step hole 24, the A-axis connecting ring 35 is connected to the A-axis second step shaft 72 in a centering mode, the left end and the right end of the A-axis connecting ring 35 are respectively fixed on the A-axis turntable bearing seat 32 and the rotor 331 of the A-axis torque motor, the A-axis brake disc 51 is fixed in the second step hole 25, the A-axis motor seat 34 is fixed in the third step hole 26, the A-axis third step shaft 73 is connected with the A-axis encoder 74 in a centering mode, the A-axis encoder 74 is installed on the A-axis encoder seat 75, the A-axis encoder seat 75 is fixed on the A-axis motor seat 34, the A-axis encoder seat 75 is fixed with the protective sleeve 76, and the protective sleeve 76 is located on the right side of the rotor 331 of the A-axis torque motor; the C-axis power shaft 45 includes a C-axis first step shaft 81, a C-axis second step shaft 82, a C-axis third step shaft 83, a C-axis fourth step shaft 84, and a C-axis fifth step shaft 85 that are integrally provided, a C-axis first step shaft 81, a C-axis second step shaft 82, a C-axis third step shaft 83, a C-axis fourth step shaft 84 and a C-axis fifth step shaft 85 are sequentially and coaxially arranged from bottom to top, the outer diameters of the C-axis fourth step shaft 84 and the C-axis fifth step shaft 85 are sequentially reduced, the C-axis first step shaft 81 is in centering connection with a square hole in the upper end of the box body 2, a rotor 431 of a C-axis torque motor is installed on the C-axis second step shaft 82, a C-axis connecting ring 47 is installed on the C-axis third step shaft 83, a C-axis encoder 86 is in centering connection with the C-axis fourth step shaft 84, the C-axis encoder 86 is reversely fixed on the lower side of the upper end cover 48, a sealing cover 87 is in centering connection with an inner hole of the upper end cover 48, and a deep groove ball bearing 88 is arranged between the sealing cover 87 and the C-axis fifth step shaft 85; a first pressing plate 37 and a second pressing plate 38 are fixed on the bearing seat 32 of the A-axis turntable through screws, the first pressing plate 37 and the second pressing plate 38 are respectively connected to the outer side of the first step shaft 71 of the A-axis in a centering manner, and the axial inner side of the brake pad 54 of the A-axis is pressed and fixed between the first pressing plate 37 and the second pressing plate 38; the third pressing plate 39 and the fourth pressing plate 30 are fixed on the C-axis power shaft 45 through screws, the third pressing plate 39 and the fourth pressing plate 30 are respectively fixed on the outer side of the bottom of the C-axis second step shaft 82 in a centering mode through rabbets, and the axial inner side of the C-axis brake pad is fixedly pressed between the third pressing plate 39 and the fourth pressing plate 30.

In the above embodiment, the operating principle of the a-axis hydraulic brake system is as follows: the rotor 331 of the A-axis torque motor provides indexing torque after being electrified, the A-axis connecting ring 35 drives the A-axis turntable bearing seat 32 and the spindle box 1 to rotate, and the A-axis can be normally processed. When the A-axis oil way 55 leads hydraulic oil to the A-axis clamping oil cavity 53, under the action of the oil pressure, the A-axis pressing ring 52 moves leftwards, and pushes the A-axis brake pad 54 leftwards to be in contact with the right surface of the A-axis brake disc 51, so that the A-axis braking action is completed; when the pressure of the A-axis clamping oil chamber 53 is zero, the A-axis pressing ring 52 is reset under the elastic force of the A-axis brake pad 54. Similarly, the rotor 431 of the C-axis torque motor provides indexing torque after being electrified, the C-axis power shaft 45 and the a-axis part are driven to rotate through the C-axis connecting ring 47, and the C-axis can be normally processed. When the C-axis oil path 65 leads hydraulic oil to the C-axis clamping oil cavity 63, the C-axis pressing ring 62 moves downwards under the action of the oil pressure to push the C-axis brake pad 64 downwards to be in contact with the upper surface of the C-axis brake disc 61, and the C-axis braking action is finished; when the pressure of the C-axis clamping oil chamber 63 is zero, the C-axis pressing ring 62 is reset under the elastic force of the C-axis brake sheet 64.

The fixed-angle processing single-arm AC swing head directly driven by the torque motor has a compact integral structure, the spindle box 1 is hidden in the box body 2, the eccentricity phenomenon of the integral structure is small, and the transposition of the C shaft is smoother; from top to bottom, the transition plate 46 is shielded, the overall dimension of the swinging head is not more than phi 480mm, the swinging head can extend into a deep cavity for processing, meanwhile, the left side of the main spindle box 1 is not provided with a redundant design, the electric spindle 11 can be close to a workpiece for processing, and the swinging head has a larger processing space and better processing manufacturability.

Claims

1. A torque motor direct-driven fixed-angle machining single-arm AC swing head comprises a spindle box, an electric spindle, a box body, an A-axis part and a C-axis part, wherein the center line of the A-axis part is perpendicular to the center line of the electric spindle, the center line of the C-axis part is parallel to the center line of the electric spindle, the electric spindle is vertically installed in the spindle box, the A-axis part is arranged in the box body and arranged on one side of the spindle box, and the C-axis part is arranged in the box body; the part A comprises an A-axis turntable bearing, an A-axis turntable bearing seat, an A-axis torque motor and an A-axis motor seat, wherein the inner ring of the A-axis turntable bearing is fixed on the A-axis turntable bearing seat, the outer ring of the A-axis turntable bearing seat is fixed on the box body, the A-axis turntable bearing seat is connected with a rotor of the A-axis torque motor through an A-axis connecting ring, the left end of the A-axis turntable bearing seat is fixed on the right side of the spindle box, the A-axis motor seat is fixed on the box body, a stator of the A-axis torque motor is fixed on the A-axis motor seat, and a protective cover is arranged on the right side of the box body; the C-axis part comprises a C-axis turntable bearing, a C-axis turntable bearing seat, a C-axis torque motor, a C-axis motor seat, a C-axis power shaft and a transition plate, the C-axis power shaft is fixed at the top end of the box body, the C-axis power shaft is fixedly connected with the upper end of a rotor of the C-axis torque motor through a C-axis connecting ring, the rotor of the C-axis torque motor is sleeved outside the C-axis power shaft, a stator of the C-axis torque motor is fixed on the C-axis motor seat, the transition plate is connected with the lower side of the stator of the C-axis torque motor in a centering manner, the transition plate is fixed on a machine tool ram, the C-axis turntable bearing seat is fixed at the upper end of the box body, the C-axis turntable bearing seat is connected with the lower side of the transition plate in a centering manner, the outer ring of the C-axis turntable bearing is fixed on the C-axis turntable bearing seat, The inner circle is fixed the upper end of box, the upper end of C axle motor cabinet install the upper end cover, the top of C axle power shaft certainly the upper end cover stretch out its characterized in that: the right side of the bearing seat of the A-axis turntable is provided with an A-axis hydraulic braking system which comprises an A-axis brake disc, an A-axis pressure ring, an A-axis clamping oil cavity and an A-axis brake pad, the A-axis brake disc is sleeved and positioned on the A-axis turntable bearing block and positioned on the right side of the A-axis turntable bearing, the A-axis compression ring is installed at the left end of the A-axis motor base in a manner of moving left and right, the A-axis clamping oil cavity is formed in the A-axis motor base and is positioned at the right side of the A-axis compression ring, an A-axis oil way communicated with the A-axis clamping oil cavity is arranged in the A-axis motor base, the left side of the A-axis brake pad is over against the right side of the A-axis brake disc, the axial inner side of the A-axis brake pad is fixed on the A-axis turntable bearing seat, and the axial outer side of the A-axis brake pad is over against the left side of the A-axis compression ring; the upside of box be provided with C axle hydraulic braking system, C axle hydraulic braking system include C axle brake disc, C axle clamping oil pocket and C axle brake block, C axle brake disc cover establish and fix a position the box on and be located the upside of box, C axle clamping ring can install with reciprocating the lower extreme of crossing the cab apron, C axle clamping oil pocket set up the cab apron in and be located the upside of C axle clamping ring, cross the cab apron in seted up with the communicating C axle oil circuit of C axle clamping oil pocket, the downside of C axle brake block just right the upside of C axle brake disc, the axial inboard of C axle brake block fix C axle power epaxially, the axial outside of C axle brake block just right the downside of C axle clamping ring.

2. The constant-angle machining single-arm AC swing head directly driven by the torque motor as claimed in claim 1, is characterized in that: the A-axis turntable bearing block comprises an A-axis first step shaft, an A-axis second step shaft and an A-axis third step shaft which are integrally arranged, the A-axis first step shaft, the A-axis second step shaft and the A-axis third step shaft are coaxially arranged from left to right in sequence, the outer diameters of the A-axis first step shaft, the A-axis second step shaft and the A-axis third step shaft are sequentially reduced, and a first step hole, a second step hole and a third step hole which are coaxially arranged from left to right in sequence and communicated with each other, and the diameters of the first step hole, the second step hole and the third step hole are sequentially increased are formed in the box body; the inner ring of the A-axis turntable bearing is fixed on the A-axis first step shaft, the outer ring of the A-axis turntable bearing is installed in the first step hole, the A-axis connecting ring is connected with the A-axis second step shaft in a centering mode, the left end and the right end of the A-axis connecting ring are respectively fixed on the A-axis turntable bearing seat and a rotor of the A-axis torque motor, the A-axis brake disc is fixed in the second step hole, the A-axis motor seat is fixed in the third step hole, the A-axis third step shaft is connected with an A-axis encoder in a centering mode, the A-axis encoder is installed on the A-axis encoder seat, and the A-axis encoder seat is fixed on the A-axis motor seat.

3. The constant-angle machining single-arm AC swing head directly driven by the torque motor as claimed in claim 2, is characterized in that: a protective sleeve is fixed on the A-axis encoder seat and is positioned on the right side of a rotor of the A-axis torque motor.

4. The constant-angle machining single-arm AC swing head directly driven by the torque motor as claimed in claim 2, is characterized in that: a first pressing plate and a second pressing plate are fixed on the bearing seat of the A-axis turntable through screws, the first pressing plate and the second pressing plate are respectively connected to the outer side of the first step shaft of the A-axis in a centering mode, and the axial inner side of the A-axis brake pad is fixedly pressed between the first pressing plate and the second pressing plate.

5. The constant-angle machining single-arm AC swing head directly driven by the torque motor as claimed in claim 1, is characterized in that: the C-axis power shaft comprises a C-axis first step shaft, a C-axis second step shaft, a C-axis third step shaft, a C-axis fourth step shaft and a C-axis fifth step shaft which are integrally arranged, the first step shaft of the C shaft, the second step shaft of the C shaft, the third step shaft of the C shaft, the fourth step shaft of the C shaft and the fifth step shaft of the C shaft are sequentially and coaxially arranged from bottom to top and the outer diameters of the first step shaft, the second step shaft, the third step shaft, the fourth step shaft and the fifth step shaft of the C shaft are sequentially reduced, the C-axis first step shaft is in centering connection with the square hole at the upper end of the box body, the rotor of the C-axis torque motor is arranged on the C-axis second step shaft, the C-axis connecting ring is arranged on the C-axis third step shaft, the C-axis fourth step shaft is connected with a C-axis encoder in a centering way, the C-shaft encoder is reversely fixed on the lower side of the upper end cover, an inner hole of the upper end cover is connected with a sealing cover in a centering mode, and a deep groove ball bearing is arranged between the sealing cover and the fifth step shaft of the C shaft.

6. The constant-angle machining single-arm AC swing head directly driven by the torque motor as claimed in claim 5, is characterized in that: and a third pressing plate and a fourth pressing plate are fixed on the C-axis power shaft through screws, the third pressing plate and the fourth pressing plate are respectively fixed at the outer side of the bottom of the C-axis second step shaft in a spigot centering manner, and the axial inner side of the C-axis brake pad is fixedly compressed between the third pressing plate and the fourth pressing plate.

7. The constant-angle machining single-arm AC swing head directly driven by the torque motor as claimed in claim 1, is characterized in that: the bearing seat of the A-axis turntable is internally provided with a transverse first wiring hole, the inner side of the upper part of the box body is provided with a transverse second wiring hole and a longitudinal third wiring hole, the C-axis power shaft is internally provided with a longitudinal fourth wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole are communicated in sequence, and the first wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole form a wiring hole path of a cable and a functional pipe required by the electric spindle.