CN213041488U

CN213041488U - Servo power knife rest reliability testing device based on electromagnetic bearing loading

Info

Publication number: CN213041488U
Application number: CN202021711809.2U
Authority: CN
Inventors: 何佳龙; 王子康; 李国发; 杨兆军; 王彦博; 刘严; 张正阳
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-04-23
Anticipated expiration: 2030-08-17

Abstract

The utility model discloses a servo power knife rest reliability testing arrangement based on electromagnetic bearing loading, include: servo power tool rest and supporting component, cutting force and torque loading component and tool bar component; the servo power tool post and support member includes: the device comprises a ground plain iron, a servo power tool rest, a tool rest supporting seat and a tool rest table; the tool rest table is fixedly connected with the horizontal iron lock through a tool rest supporting seat; the servo power tool rest is fixed on the tool rest table; an XYZ-direction electromagnetic loading unit and a Z-direction moving unit in the cutting force loading component are arranged on a workbench; the workbench is in sliding connection with the loading support seat at the upper end of the ground iron through a sliding plate; the cutter bar component and the Z-direction moving unit realize XYZ-direction loading and torque loading of the power cutter rest; the invention realizes the XYZ loading and torque loading of the power tool rest through the radial-axial electromagnetic bearing and the electromagnet consisting of the U-shaped iron core and the coil, simulates static and dynamic cutting force and cutting torque, and is convenient to carry out the reliability test of the servo power tool rest.

Description

Servo power knife rest reliability testing device based on electromagnetic bearing loading

Technical Field

The utility model belongs to the technical field of reliability test of numerical control equipment; in particular to a servo power tool rest reliability testing device based on electromagnetic bearing loading.

Background

The numerical control machine tool is a high-precision and high-efficiency automatic machine tool. The multi-station servo power tool rest is provided, has wide processing performance, can process rotary parts, can mill planes, drill non-central holes and the like, and obviously improves the processing efficiency in the batch production of complex parts. However, the servo power tool rest has a complex structure and various failure modes and failure types, the domestic servo power tool rest has frequent failures, and the reliability level of the servo power tool rest has a certain difference from the international advanced level. The comprehensive efficiency of the numerical control machine tool and the quality of a processed product are closely related to the reliability level and the performance of the servo power tool rest. According to statistics, the fault number of the servo power tool rest accounts for 30% of the total fault number of the numerical control lathe. The reliability test and the test are technical means for improving the reliability level of the servo power tool rest, so that the reliability test and the test research on the servo power tool rest are of great significance.

Aiming at a reliability test device of a servo power tool rest, most enterprises adopt a bias test or an idle test at present, and high colleges and universities such as Jilin university simulate the actual dynamic cutting force of the servo power tool rest through electro-hydraulic servo, electromagnetic thrust, machinery and other loading modes. The electro-hydraulic servo loading technology is mature, but the electro-hydraulic servo loading has some defects, such as loading frequency generally not exceeding 100Hz, loading angle not easy to adjust, occupied space is large, hydraulic oil is easy to leak, and the like; disadvantages of electric putter loading include: the load spectrum is very low, the start is difficult with load, the output force and speed in the rated range can not be adjusted in a stepless way, the output force is small, and the like; the electromagnetic thrust disc can only load static axial tension and has the defects of large volume, serious heat generation, high cost, difficult processing and assembly and the like. For the cutting torque borne by a power head of a servo power tool rest, currently, most of the cutting torques are loaded by adopting a dynamometer, a magnetic powder brake and the like. However, the dynamometer has the defects of high cost, large volume and the like; the magnetic powder brake is not suitable for continuous long-time tests and the like. Aiming at the problems, the invention provides a servo power tool rest reliability testing device based on electromagnetic bearing loading in order to be closer to the actual use working condition of a servo power tool rest and solve the problems of the existing servo power tool rest reliability testing stand.

Disclosure of Invention

The utility model aims to solve the technical problems and overcome the problem that the prior art can not simultaneously and conveniently carry out X, Y, Z three-direction static and dynamic cutting force and cutting torque simulation loading on a servo power tool rest; the reliability testing device for the servo power tool rest based on electromagnetic bearing loading is provided;

servo power knife rest reliability testing arrangement based on electromagnetic bearing loading, it includes: servo power tool rest and supporting component, cutting force and torque loading component and tool bar component;

the servo power tool rest and the supporting component comprise: the device comprises a ground flat iron 1, a servo power tool rest 4, a tool rest table 5 and a tool rest supporting seat 6; the tool rest table 5 is fixedly connected with the ground flat iron 1 through a tool rest supporting seat 6; the servo power tool rest 4 is fixed on the tool rest table 5;

the cutting force and torque loading member comprises: the device comprises a loading support seat 2, a workbench 3, a sliding plate 7, a left box cover 9, an upper box body 10, a right box cover 13, a V-shaped block 14, a lower box body 15, a laser displacement sensor A16, a laser displacement sensor B17, a laser displacement sensor C18, a radial-electromagnetic bearing 12, an L-shaped plate 26, a servo electric cylinder 27, a coupling 28, a three-dimensional force measuring instrument 29, a loading workbench 30, a linear guide rail 31, a connecting end cover 32, a U-shaped iron core 33, a coil 34, an S-shaped tension and pressure sensor 35 and a second threaded hole 46;

the loading support seat 2 is of a welded structure, and the loading support seat 2 is connected with the ground flat iron 1 through a T-shaped bolt; the sliding plate 7 is fixed on the upper surface of the loading supporting seat 2 through a socket head cap screw; the workbench 3 is connected with the sliding plate 7 through a T-shaped bolt; the L-shaped plate 26 is fixed on the workbench 3 through an inner hexagon bolt; the upper box body 10 and the lower box body 15 are fixedly connected through inner hexagon bolts, and the two sides of the box body are sealed through the left box cover 9 and the right box cover 13, so that the dustproof and protective effects are achieved; the upper surface of the three-dimensional force measuring instrument 29 is fixed on the lower surface of the lower box body 15 through hexagon socket head cap screws, the lower surface of the three-dimensional force measuring instrument 29 is fixed on the loading workbench 30 through hexagon socket head cap screws, and the three-dimensional force measuring instrument 29 can measure the magnitude of three-direction forces simulating loading in real time; the radial-axial electromagnetic bearing 12 is fixed in the box body through the V-shaped block 14, the second threaded hole 46 and the first threaded hole 11, and the first threaded hole 11 is connected with the second threaded hole 46 through a hexagon socket head cap screw; the laser displacement sensor A16 and the laser displacement sensor B17 are fixed on the inner side of the lower box body 15 through hexagon socket head cap bolts; the laser displacement sensor C18 is fixed on the inner side of the left box cover 9 through an inner hexagon bolt; the laser displacement sensor A16 and the laser displacement sensor B17 can monitor the radial air gap of the radial-axial electromagnetic bearing 12 in real time, and the laser displacement sensor C18 can monitor the axial air gap of the radial-axial electromagnetic bearing 12 in real time; one end of the servo electric cylinder 27 is fixed on the workbench 3 through an L-shaped plate 26; the loading workbench 30 is connected with the linear guide rail 31 in a sliding way; the linear guide rail 31 is fixed on the worktable 3; the servo electric cylinder 27 is connected with the loading workbench 30 through a coupling 28 and a connecting end cover 32, and the servo electric cylinder 27 can drive the loading workbench 30 to reciprocate along a linear guide rail 31; the coil 34 is fixed on the U-shaped iron core 33, the U-shaped iron core 33 is fixed on the S-shaped pull pressure sensor 35 through an inner hexagon screw, and the S-shaped pull pressure sensor 35 is fixed on the loading workbench 30 through an inner hexagon screw; the electromagnet consisting of the coil 34 and the U-shaped iron core 33 can realize torque loading on the power tool rest, and can load radial force in the vertical downward direction on the power tool rest, and the S-shaped pull pressure sensor 35 can measure the radial force in the vertical downward direction loaded by the electromagnet in real time; the closed-loop control of the cutting force in the XYZ direction can be realized through the feedback and detection of the three-dimensional dynamometer 29 and the S-shaped pull pressure sensor 35;

the cutter bar member includes: the device comprises a screw 36, a spring washer 37, a rotor A38, a magnetic isolation aluminum ring 39, a rotor B40, a lock nut 41, a simulation cutter bar 42, a loading disc 43, a flange type dynamic torque sensor 44 and a long high-neck flange 45; the rotor A38, the magnetic isolation aluminum ring 39 and the rotor B40 are locked on the simulation cutter bar 42 through screws 36 and spring washers 37, and the magnetic isolation aluminum ring 39 is positioned between the rotor A38 and the rotor B40; the loading disc 43 is in flat key connection with the simulation cutter bar 42 and is locked on the simulation cutter bar 42 through a locking nut 41; the simulation cutter bar 42 is fixedly connected with the flange type dynamic torque sensor 44; the flange type dynamic torque sensor 44 is fixedly locked on the servo power tool rest 4 through a long high neck flange 45; when the rotor A38, the rotor B40 and the magnetism isolating aluminum ring 39 are positioned in the radial-axial electromagnetic bearing, XYZ loading of the power tool rest can be realized; when the loading disc 43 and the U-shaped iron core 33 are aligned up and down and are positioned inside the U-shaped iron core 33, the torque loading on the power knife rest can be realized.

Based on the servo power tool rest reliability testing arrangement of electromagnetic bearing loading, radial-electromagnetic bearing 12 mainly includes: the radial-axial electromagnetic bearing 12 is provided with a stator end cover A19, an axial coil A20, a stator 21, an axial coil B22, a stator end cover B23, a stator core 24 and a radial coil 25. The axial coil A20 and the axial coil B22 are provided with axial control coils, the axial control coils are driven by a power amplifier, and the axial control magnetic fluxes of the left and right axial air gaps are controlled by controlling the currents of the axial coil A20 and the axial coil B22, so that the axial suspension force is changed; the control of the radial suspension force in the radial-axial electromagnetic bearing 12 is realized by the offset and superposition of the bias magnetic flux and the radial control magnetic flux, the current in the axial coil 20 and the axial coil 22 provides the bias magnetic flux and the axial control magnetic flux at the same time, and the radial coil 25 provides the radial control magnetic flux; the stator core 24 is formed by laminating silicon steel sheets; the radial coil 25 comprises six radial control coils which are uniformly distributed along the circumference, two coils which are symmetrical to each other are connected in series to form a phase, three groups of radial control coils are driven by a three-phase power inverter, and the magnitude and the direction of the cutting force loading in the three XYZ directions can be controlled by controlling the magnitude and the direction of direct current of the axial coil A20 and the axial coil B22 and three-phase current of the radial coil 25.

Compared with the prior art, the invention has the beneficial effects that:

1. the utility model discloses a servo power tool rest reliability testing arrangement based on electromagnetic bearing loading adopts radial-axial electromagnetic bearing simulation XYZ three direction quiet, dynamic cutting force loading, adopts the electromagnetism disc simulation cutting torque loading simultaneously, can simulate the quiet of servo power tool rest in the actual cutting process simultaneously, dynamic cutting force and cutting torque;

2. the cutting force loading component adopts a radial-axial electromagnetic bearing to load cutting forces in XYZ three directions; compared with the traditional loading modes of hydraulic pressure, an electric push rod, an electromagnetic disc and the like, the loading mode of the electromagnetic bearing can utilize one set of device to realize the simultaneous application of static cutting force and dynamic cutting force in three directions on the servo power tool rest, and the application of the cutting force in the three directions completely conforms to the cutting load condition borne by the tool rest in the actual cutting process; meanwhile, the radial-axial electromagnetic bearing has the advantages of small volume, simple structure, real-time and accurate adjustment of cutting force and the like, and is convenient for researchers to carry out reliability test on the servo power tool rest;

3. the cutting torque loading part adopts an electromagnet and an electromagnetic disc to carry out cutting torque loading; compared with the loading of a dynamometer, the loading mode has the advantages of low cost, simple structure, small device and the like, and the simulated cutting torque can be accurately adjusted in real time;

4. when the tool rest stations with different specifications and models are tested, the servo electric cylinder can automatically push out the whole set of loading system, and the loading is carried out after the tool rest completes the tool changing action, so that manual adjustment is not needed in the process, and automatic loading is realized.

Drawings

Fig. 1 is a schematic axial view of a device for testing the reliability of a servo power tool rest based on electromagnetic bearing loading according to the present invention;

fig. 2 is a schematic front view of the servo power tool rest reliability testing device based on electromagnetic bearing loading according to the present invention;

fig. 3 is a schematic front view of a cutting force loading component of the servo power tool rest reliability testing device based on electromagnetic bearing loading according to the present invention;

fig. 4 is an axial view of the radial-axial electromagnetic bearing of the servo power tool rest reliability testing device based on electromagnetic bearing loading according to the present invention;

fig. 5 is a disassembled axial view of a moving part (a servo electric cylinder drives a loading worktable to reciprocate along a linear guide rail) in a cutting force and torque loading part of the servo power tool rest reliability testing device based on electromagnetic bearing loading according to the present invention;

fig. 6 is an axial view of a cutting torque loading part of the servo power tool rest reliability testing device based on electromagnetic bearing loading according to the present invention;

fig. 7 is a tool bar component exploded axial view of the device for testing the reliability of a servo power tool rest based on electromagnetic bearing loading according to the present invention;

illustration and explanation: a ground flat iron 1, a loading support seat 2, a workbench 3, a servo power tool rest 4, a tool rest table 5, a tool rest support seat 6, a sliding plate 7, a left box cover 9, an upper box body 10, a first threaded hole 11, a radial-axial electromagnetic bearing 12, a right box cover 13, a V-shaped block 14, a lower box body 15, a laser displacement sensor A16, a laser displacement sensor B17, a laser displacement sensor C18, a stator end cover A19, an axial coil A20, a stator 21, an axial coil B22, a stator end cover B23, a stator core 24, a radial coil 25, an L-shaped plate 26, a servo electric cylinder 27, a coupling 28, a three-dimensional dynamometer 29, a loading workbench 30, a linear guide rail 31, a connecting end cover 32, a U-shaped core 33, a coil 34, an S-shaped tension pressure sensor 35, a screw 36, a spring washer 37, a rotor A38, a magnetic isolation aluminum ring 39, a rotor B40, a locking nut 41, a cutter bar simulation, a flange type dynamic torque sensor 44, a long high neck flange 45 and a second threaded hole 46.

Detailed Description

The utility model discloses servo power knife rest reliability test device based on electromagnetic bearing loading includes: servo power tool rest and supporting component, cutting force and torque loading component and tool bar component;

EXAMPLE 1 Servo powered tool holder and support part

Referring to fig. 1, the servo power tool post and support assembly includes: the device comprises a ground flat iron 1, a servo power tool rest 4, a tool rest table 5 and a tool rest supporting seat 6; the servo power tool rest 4 is fixed on the tool rest table 5; the tool rest table 5 is fixedly connected with the ground flat iron 1 through a tool rest supporting seat 6;

the tool rest supporting seat 6 is of a welding structure and is formed by welding steel plates, a bolt hole is formed in the bottom plate of the tool rest supporting seat 6 and is connected with the ground flat iron 1 through a T-shaped bolt, and a threaded hole is formed in the upper surface of the top plate of the tool rest supporting seat 6 and is used for mounting the tool rest table 5; the tool rest table 5 is connected with the tool rest supporting seat 6 through a T-shaped bolt, and two rows of threaded holes are formed in the upper surface of the tool rest table 5 and used for mounting the servo power tool rest 4; the servo power tool rest 4 is connected with the tool rest table 5 through a T-shaped bolt, and the position of the servo power tool rest 4 relative to the tool rest table 5 can be adjusted according to threaded holes in different positions.

EXAMPLE 2 cutting force and Torque Loading Member

Referring to fig. 1 to 6, the cutting force loading part includes: the device comprises a loading support seat 2, a workbench 3, a sliding plate 7, a left box cover 9, an upper box body 10, a right box cover 13, a V-shaped block 14, a lower box body 15, a laser displacement sensor A16, a laser displacement sensor B17, a laser displacement sensor C18, a radial-electromagnetic bearing 12, an L-shaped plate 26, a servo electric cylinder 27, a coupler 28, a three-dimensional force measuring instrument 29, a loading workbench 30, a linear guide rail 31, a connecting end cover 32, a U-shaped iron core 33, a coil 34 and an S-shaped pulling pressure sensor 35;

the loading support seat 2 is of a welded structure, and the loading support seat 2 is connected with the ground flat iron 1 through a T-shaped bolt; the sliding plate 7 is fixed on the upper surface of the loading supporting seat 2 through a socket head cap screw; the workbench 3 is connected with the sliding plate 7 through a T-shaped bolt; the L-shaped plate 26 is fixed on the workbench 3 through an inner hexagon bolt; the upper box body 10 and the lower box body 15 are fixedly connected through inner hexagon bolts, and the two sides of the box body are sealed through the left box cover 9 and the right box cover 13, so that the dustproof and protective effects are achieved; the upper surface of the three-dimensional force measuring instrument 29 is fixed on the lower surface of the lower box body 15 through hexagon socket head cap screws, the lower surface of the three-dimensional force measuring instrument 29 is fixed on the loading workbench 30 through hexagon socket head cap screws, and the three-dimensional force measuring instrument 29 can measure the magnitude of three-direction forces simulating loading in real time; the radial-axial electromagnetic bearing 12 is fixed in the box body through the V-shaped block 14, the second threaded hole 46 and the first threaded hole 11, and the first threaded hole 11 is connected with the second threaded hole 46 through a hexagon socket head cap screw; the radial-axial electromagnetic bearing 12 is provided with a stator end cover A19, an axial coil A20, a stator 21, an axial coil B22, a stator end cover B23, a stator core 24 and a radial coil 25. The axial coil A20 and the axial coil B22 are provided with axial control coils, the axial control coils are driven by a power amplifier, and the axial control magnetic fluxes of the left and right axial air gaps are controlled by controlling the currents of the axial coil A20 and the axial coil B22, so that the axial suspension force is changed; the radial-axial electromagnetic bearing 12 is fixed in the box body through the V-shaped block 14, the second threaded hole 46 and the first threaded hole 11, and the first threaded hole 11 is connected with the second threaded hole 46 through a hexagon socket head cap screw; the radial-axial electromagnetic bearing 12 is provided with a stator end cover A19, an axial coil A20, a stator 21, an axial coil B22, a stator end cover B23, a stator core 24 and a radial coil 25. The control of the medium radial suspension force is realized by offsetting and overlapping of bias magnetic flux and radial control magnetic flux, the current in the axial coil 20 and the axial coil 22 provides the bias magnetic flux and the axial control magnetic flux at the same time, and the radial coil 25 provides the radial control magnetic flux; the stator core 24 is formed by laminating silicon steel sheets; the radial coil 25 comprises six radial control coils which are uniformly distributed along the circumference, two coils which are symmetrical to each other are connected in series to form a phase, three groups of radial control coils are driven by a three-phase power inverter, and the magnitude and the direction of the cutting force loading in the three directions of XYZ can be controlled by controlling the magnitude and the direction of the direct current of the axial coil A20 and the axial coil B22 and the three-phase current of the radial coil 25; the laser displacement sensor A16 and the laser displacement sensor B17 are fixed on the inner side of the lower box body 15 through hexagon socket head cap bolts; the laser displacement sensor C18 is fixed on the inner side of the left box cover 9 through an inner hexagon bolt; the laser displacement sensor A16 and the laser displacement sensor B17 can monitor the radial air gap of the radial-axial electromagnetic bearing 12 in real time, and the laser displacement sensor C18 can monitor the axial air gap of the radial-axial electromagnetic bearing 12 in real time; one end of the servo electric cylinder 27 is fixed on the workbench 3 through an L-shaped plate 26; the loading workbench 30 is connected with the linear guide rail 31 in a sliding way; the linear guide rail 31 is fixed on the worktable 3; the servo electric cylinder 27 is connected with the loading workbench 30 through a coupling 28 and a connecting end cover 32, and the servo electric cylinder 27 can drive the loading workbench 30 to reciprocate along a linear guide rail 31; the coil 34 is fixed on the U-shaped iron core 33, the U-shaped iron core 33 is fixed on the S-shaped pull pressure sensor 35 through an inner hexagon screw, and the S-shaped pull pressure sensor 35 is fixed on the loading workbench 30 through an inner hexagon screw; the electromagnet consisting of the coil 34 and the U-shaped iron core 33 can realize torque loading on the power tool rest, and can load radial force in the vertical downward direction on the power tool rest, and the S-shaped pull pressure sensor 35 can measure the radial force in the vertical downward direction loaded by the electromagnet in real time; the closed-loop control of the cutting force in the XYZ directions can be realized through the feedback and detection of the three-dimensional force measuring instrument 29 and the S-shaped pull pressure sensor 35.

EXAMPLE 3 tool Bar Member

Referring to fig. 7, the cutter bar components include a screw 36, a spring washer 37, a rotor a38, a magnetic isolation aluminum ring 39, a rotor B40, a lock nut 41, a simulation cutter bar 42, a loading disc 43, a flange type dynamic torque sensor 44, and a long high neck flange 45;

the rotor A38, the magnetic isolation aluminum ring 39 and the rotor B40 are locked on the simulation cutter bar 42 through screws 36 and spring washers 37, and the magnetic isolation aluminum ring 39 is positioned between the rotor A38 and the rotor B40; the loading disc 43 is connected with the simulation cutter bar 42 through a flat key, the locking nut 41 fixes the loading disc 43 on the simulation cutter bar 42, and the simulation cutter bar 42 is fixedly connected with the flange type dynamic torque sensor 44 through an inner hexagon screw; the flange type dynamic torque sensor 44 and the long high-neck flange 45 are fixedly connected through an inner hexagon screw, the flange type dynamic torque sensor 44 can measure the torque loaded on the power tool rest in real time, and the long high-neck flange 45 is fixed on the servo power tool rest 4 through a pin; when the rotor A38, the rotor B40 and the magnetism isolating aluminum ring 39 are positioned in the radial-axial electromagnetic bearing 12, the rotor A38 and the rotor B40 can be loaded, and finally, the rotor A40 and the rotor B40 act on the simulation knife bar 42 to realize the XYZ loading of the power knife rest; when the loading disc 43 and the U-shaped iron core 33 are aligned up and down and are positioned inside the U-shaped iron core 33, the torque loading of the power knife rest is realized.

Claims

1. Servo power knife rest reliability testing arrangement based on electromagnetic bearing loading, its characterized in that, it includes: servo power tool rest and supporting component, cutting force and torque loading component and tool bar component;

the servo power tool rest and the supporting component comprise: the device comprises a ground plain iron (1), a servo power tool rest (4), a tool rest table (5) and a tool rest supporting seat (6); the tool rest table (5) is fixedly connected with the ground flat iron (1) through a tool rest supporting seat (6); the servo power tool rest (4) is fixed on the tool rest table (5);

the cutting force and torque loading member comprises: the device comprises a loading supporting seat (2), a workbench (3), a sliding plate (7), a left box cover (9), an upper box body (10), a right box cover (13), a V-shaped block (14), a lower box body (15), a laser displacement sensor A (16), a laser displacement sensor B (17), a laser displacement sensor C (18), a radial-electromagnetic bearing (12), an L-shaped plate (26), a servo electric cylinder (27), a coupler (28), a three-dimensional dynamometer (29), a loading workbench (30), a linear guide rail (31), a connecting end cover (32), a U-shaped iron core (33), a coil (34), an S-shaped tension pressure sensor (35) and a second threaded hole (46);

the loading supporting seat (2) adopts a welding structure, and the loading supporting seat (2) is connected with the ground flat iron (1) through a T-shaped bolt; the sliding plate (7) is fixed on the upper surface of the loading supporting seat (2) through an inner hexagon screw; the workbench (3) is connected with the sliding plate (7) through a T-shaped bolt; the L-shaped plate (26) is fixed on the workbench (3) through an inner hexagon bolt; the upper box body (10) and the lower box body (15) are fixedly connected through the hexagon socket head cap bolts, and the two sides of the box body are sealed through the left box cover (9) and the right box cover (13), so that the dustproof and protective effects are achieved; the upper surface of the three-dimensional dynamometer (29) is fixed on the lower surface of the lower box body (15) through a hexagon socket head cap screw, the lower surface of the three-dimensional dynamometer (29) is fixed on the loading workbench (30) through a hexagon socket head cap screw, and the three-dimensional dynamometer (29) can measure the magnitude of three-direction forces simulating loading in real time; the radial-axial electromagnetic bearing (12) is fixed in the box body through a V-shaped block (14), a second threaded hole (46) and a first threaded hole (11), and the first threaded hole (11) is connected with the second threaded hole (46) through an inner hexagonal bolt; the laser displacement sensor A (16) and the laser displacement sensor B (17) are fixed on the inner side of the lower box body (15) through hexagon socket head cap screws; the laser displacement sensor C (18) is fixed on the inner side of the left box cover (9) through an inner hexagon bolt; the laser displacement sensor A (16) and the laser displacement sensor B (17) can monitor the radial air gap of the radial-axial electromagnetic bearing (12) in real time, and the laser displacement sensor C (18) can monitor the axial air gap of the radial-axial electromagnetic bearing (12) in real time; one end of the servo electric cylinder (27) is fixed on the workbench (3) through an L-shaped plate (26); the loading workbench (3)0 is connected with the linear guide rail (31) in a sliding way; the linear guide rail (31) is fixed on the workbench (3); the servo electric cylinder (27) is connected with the loading workbench (30) through a coupling (28) and a connecting end cover (32), and the servo electric cylinder (27) can drive the loading workbench (30) to reciprocate along a linear guide rail (31); the coil (34) is fixed on the U-shaped iron core (33), the U-shaped iron core (33) is fixed on the S-shaped tension and pressure sensor (35) through an inner hexagon screw, and the S-shaped tension and pressure sensor (35) is fixed on the loading workbench (30) through an inner hexagon screw; the electromagnet consisting of the coil (34) and the U-shaped iron core (33) can realize torque loading on the power tool rest;

the cutter bar member includes: the device comprises a screw (36), a spring washer (37), a rotor A (38), a magnetism isolating aluminum ring (39), a rotor B (40), a locking nut (41), a simulation cutter bar (42), a loading disc (43), a flange type dynamic torque sensor (44) and a long high neck flange (45); the rotor A (38), the magnetic isolation aluminum ring (39) and the rotor B (40) are locked on the simulation cutter bar (42) through screws (36) and spring washers (37), and the magnetic isolation aluminum ring (39) is positioned between the rotor A (38) and the rotor B (40); the loading disc (43) is in flat key connection with the simulation cutter bar (42) and is locked on the simulation cutter bar (42) through a locking nut (41); the simulation cutter bar (42) is fixedly connected with the flange type dynamic torque sensor (44); the flange type dynamic torque sensor (44) is locked on the servo power tool rest (4) through a long high neck flange (45).

2. The servo-powered tool holder reliability testing device based on electromagnetic bearing loading of claim 1, wherein: the radial-electromagnetic bearing (12) comprises: the radial-axial electromagnetic bearing (12) is provided with a stator end cover A (19), an axial coil A (20), a stator (21), an axial coil B (22), a stator end cover B (23), a stator iron core (24) and a radial coil (25);

the axial coil A (20) and the axial coil B (22) are provided with axial control coils, the axial control coils are driven by a power amplifier, and the axial control magnetic fluxes of the left and right axial air gaps are controlled by controlling the currents of the axial coil A (20) and the axial coil B (22), so that the axial suspension force is changed; the control of the radial suspension force in the radial-axial electromagnetic bearing (12) is realized by the offset and superposition of the bias magnetic flux and the radial control magnetic flux, the current in the axial coil A (20) and the axial coil B (22) provides the bias magnetic flux and the axial control magnetic flux simultaneously, and the radial coil (25) provides the radial control magnetic flux; the stator core (24) is formed by laminating silicon steel sheets; the radial coil (25) comprises six radial control coils which are uniformly distributed along the circumference, two coils which are symmetrical to each other are connected in series to form a phase, three groups of radial control coils are driven by a three-phase power inverter, and the magnitude and the direction of the cutting force loading in the three XYZ directions can be controlled by controlling the magnitude and the direction of direct current of the axial coil A (20) and the axial coil B (22) and three-phase current of the radial coil (25).