CN106768994B - Multi-physical-field composite loading electric spindle reliability test device - Google Patents

Abstract

The invention belongs to the technical field of mechanical test equipment, relates to a multi-physical-field composite loading electric spindle reliability test device, and solves the problems that the prior art cannot simulate the conditions of thermal bending deformation, force bending deformation, cutting vibration and cutting torque of an electric spindle in a machining process and cannot simulate any spatial arrangement mode of the electric spindle; the device comprises a loading unit, an electric spindle position adjusting device and a performance detecting device; the loading unit comprises an electro-hydraulic servo loading device, a bearing coupler mixed loading unit, a bearing loading rotating unit and a dynamometer adjusting mechanism; the electric spindle position adjusting device comprises a main bracket and an electric spindle mounting table; the bearing coupling hybrid loading unit and the bearing loading rotating unit are arranged between the electric spindle mounting table and the dynamometer adjusting mechanism; the whole device can rotate around the loading end in a vertical plane to simulate horizontal and vertical working conditions; cutting force, cutting torque, bending deformation and thermal load are simultaneously applied to the front end of the tool shank, and the actual cutting process of the electric spindle is simulated.

Description

A multi-physics field composite loading electric spindle reliability test device

technical field

The invention belongs to the technical field of mechanical test equipment, and relates to a multi-physics-field compound-loaded electric spindle reliability test device, in particular to a cutting tool capable of simulating the thermal bending deformation, force bending deformation, and cutting force of the spindle during the cutting process. Vibration and simulated cutting torque to realize the reliability test device of compound loading.

Background technique

CNC machine tools are an important cornerstone of industrial modernization, and their quality, performance and ownership have become an important symbol to measure a country's industrialization level and comprehensive national strength. The electric spindle is one of the key components of the CNC machine tool. Due to its complex internal structure, it brings high-efficiency machining and frequent failures. Its reliability level directly affects the reliability of high-end machine tools.

At present, in the process of reliability testing of electric spindles at home and abroad, most of the reliability test devices of electric spindles at home and abroad adopt the method of directly applying axial force and radial force to the tested spindle after the spindle is connected with the dynamometer, and there is no simulation of the cutting process. The test device for thermal bending deformation and force bending deformation of electric spindle. In terms of the placement of the electric spindle, most of them adopt two states of horizontal or vertical, which cannot fully simulate the arrangement of the electric spindle in space. These factors have hindered the development process of electric spindle reliability test.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problems that the existing technology cannot comprehensively simulate the thermal bending deformation, force bending deformation, cutting vibration and cutting torque of the electric spindle during the machining process, and cannot simulate the arbitrary spatial arrangement of the electric spindle. Therefore, an electric spindle reliability test device that can simulate thermal bending deformation, force bending deformation, cutting vibration caused by cutting force and composite loading of torque in the cutting process is designed.

The electric spindle reliability test device can conduct reliability tests on the spindle according to specific loading rules, simulating the real working conditions of the tested spindle to the greatest extent. In view of the bending that occurs during the milling process of the electric spindle, a device for simulating the bending condition of the electric spindle has been developed, and the controllable heat source simulation method is used to heat the front end of the spindle tool handle, so as to better simulate the thermal bending deformation of the spindle Effect on dynamic and static stress.

In order to solve the above-mentioned technical problems, the present invention is realized by adopting the following technical solutions, which are described as follows in conjunction with the accompanying drawings:

An electric spindle reliability test device with multi-physical field composite loading, including a loading unit, an electric spindle position adjustment device, a performance detection device and an auxiliary equipment device;

The loading unit includes an electro-hydraulic servo loading device 2, a bearing coupling hybrid loading unit 6, a bearing loading rotation unit 9 and a dynamometer adjustment mechanism 10;

The electric spindle position adjustment device includes a main bracket 5 and an electric spindle installation platform 8;

The performance detection device includes a laser displacement sensor 7;

The laser displacement sensor 7, the electric spindle mounting table 8 and the dynamometer adjustment mechanism 10 are fixed on the rotating table 13 in the main support 5;

The electro-hydraulic servo loading device 2 and the main support 5 are installed on the horizontal iron 1 in the auxiliary equipment device;

The bearing coupling hybrid loading unit 6 and the bearing loading rotating unit 9 are installed between the electric spindle installation platform 8 and the dynamometer adjustment mechanism 10 .

The main support 5 described in the technical solution also includes a driving shaft 12, a fixed support 14 and a rotating motor 15; The power machine adjustment mechanism 10; the drive motor 15 drives the rotary table 13 to rotate around the drive shaft 12, thereby driving the laser displacement sensor 7 fixed on the rotary table 13, the electric spindle installation table 8 and the dynamometer adjustment mechanism 10 to rotate, and to realize a complete set of tests The rotation of the device around the drive shaft 12 simulates the stress conditions of different tilt states when the main shaft is cutting.

The motorized spindle installation platform 8 described in the technical solution includes a motorized spindle 16, an angle indicator plate 17, a motorized spindle bracket 18, a spindle clamp 19 and a locking bolt 20;

The spindle clamp 19 is installed on the outer ring of the electric spindle 16 to fix the electric spindle 16; the electric spindle support 18 is installed on the rotary table 13;

The dynamometer adjustment mechanism 10 described in the technical solution includes a dynamometer 21, a dynamometer fixing plate 22, a rotating disk 23, a dynamometer rotating fixed table 24 and a position adjuster 25;

The dynamometer 21 is installed on the dynamometer fixed plate 22, and the dynamometer fixed plate 22 is installed on the rotating disk 23 in the dynamometer rotating fixed table 24, and the motor drives the rotating disk 23 to rotate, thereby driving the dynamometer 21 and dynamometer fixed plate 22 rotate together;

The position adjuster 25 is fixed on the rear part of the rotating fixed table 24 of the dynamometer, and is installed on the rotating table 13 of the main support 5 .

The electro-hydraulic servo loading device 2 described in the technical solution includes an arc guide rail 26, an electro-hydraulic servo loading mechanism 27, a loading angle adjustment mechanism 28 and a base 29;

The arc guide rail 26 is installed on the horizontal iron 1, the base 29 can slide on the arc guide rail 26, the loading angle adjustment mechanism 28 is fixed on the base 29, the loading angle adjustment mechanism 28 is provided with an arc groove, and the electro-hydraulic servo loading mechanism Both sides of the lower base plate of 27 are installed in the arc groove of the loading angle adjustment mechanism 28, and the angle adjustment of the electro-hydraulic servo loading mechanism 27 is realized by rotating in the arc groove.

The bearing coupling hybrid loading unit 6 described in the technical solution includes a loading mechanism housing 30, a simulated handle 31, a heating ring 34, and a diaphragm coupling 35;

A pit 43 is provided on the surface of the loading mechanism shell 30;

The simulated handle 31 is connected to the diaphragm coupling 35, and the heating ring 34 is installed outside the diaphragm coupling 35;

One end of the diaphragm coupling 35 is connected to the electric spindle 16 , and the other end is connected to the dynamometer 21 .

The bearing-loaded rotating unit 9 in the technical solution includes a turbine 40, a worm 41, and a driving motor 42;

The output end of the drive motor 42 is directly connected to the worm 41 to drive the turbine 40 to rotate;

The turbine 40 cooperates with the bottom cover II38 of the mixing loading unit 6 of the bearing coupling.

The horizontal projection of the axis of the electric spindle 16 described in the technical solution is on the center of the arc-shaped guide rail 26 in the electro-hydraulic servo loading device 2. During the sliding process of the base 29 along the arc-shaped guide rail 26, the electric motor in the electro-hydraulic servo loading device 2 The loading point 44 at the front end of the hydraulic servo loading mechanism 27 is always in contact with the pit 43 on the surface of the loading mechanism shell 30 in the bearing coupling mixing loading unit 6 .

The laser displacement sensor 7 described in the technical solution is fixed on the surface of the main support 5 by using a magnetic suction seat, and the position is adjusted so that the laser head of the laser displacement sensor 7 is aligned with the electric spindle 16 and is close to the nearest end of the laser displacement sensor 7, so that the detected displacement value is the smallest. Realize the detection of parameters such as radial runout and rotation accuracy of the electric spindle 16 .

The auxiliary equipment device described in the technical solution also includes a cooling control cabinet 3, a hydraulic station 4 and an industrial computer 11;

The cooling control cabinet 3, the hydraulic station 4, and the industrial computer 11 are placed on the ground;

The cooling control cabinet 3 provides coolant for the main shaft, and is provided with a flow control valve, which can control the flow of coolant;

The hydraulic station 4 provides pulling force for the broach mechanism inside the electric spindle 16;

The industrial computer 11 realizes the parameter acquisition and control functions of the entire reliability test system, and can display the operating status of the test device on the display.

The beneficial technical effects of the present invention compared with prior art:

1. The entire electric spindle reliability test device can rotate in the vertical plane around the cutting force loading end, thereby simulating the state of horizontal, vertical and tilted at various angles in the actual machining process of the electric spindle, which is more conducive to the real working of the electric spindle. simulation of the situation.

2. This patent designs a controllable loading device for the four major loads of cutting force, cutting torque, bending deformation and thermal load in the actual work of the electric spindle, and uses the bearing coupling mixed loading unit to combine these four loads At the same time, it is applied to the front end of the tool handle of the electric spindle to more realistically simulate all the loads that the electric spindle receives during the actual cutting process.

3. According to the bending phenomenon of the spindle during the milling process of the electric spindle, a device for applying a bending load to the electric spindle is designed, so as to better simulate the impact on the electric spindle itself after the front section of the electric spindle tool rod is bent and deformed during the cutting process; The controllable heat source simulation method heats the front end of the spindle tool holder, which can better simulate the influence of the electric spindle on the performance index after thermal deformation.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is the axial side projection diagram of the electric spindle reliability test device of multi-physics field compound loading according to the present invention;

Fig. 2 is a main support axonometric view of the present invention;

Fig. 3 is an axonometric view of the electric spindle mounting table according to the present invention;

Fig. 4 is the axonometric view of the adjustment mechanism of the dynamometer according to the present invention;

Fig. 5 is an axonometric view of the electro-hydraulic servo loading device according to the present invention;

Fig. 6 is an axonometric view of the hybrid loading unit of the bearing coupling according to the present invention;

Fig. 7 is an axonometric view of a bearing-loaded rotating unit according to the present invention;

Fig. 8 is a working principle diagram of the electro-spindle reliability test device according to the present invention;

Fig. 9 is a schematic diagram of the loading principle of the liquid point servo loading device according to the present invention;

Fig. 10 is a schematic diagram of the loading principle of the electro-spindle in bending condition according to the present invention;

In the picture:

1. Horizontal iron, 2. Electro-hydraulic servo loading device, 3. Cooling control cabinet, 4. Hydraulic station, 5. Main support, 6. Bearing coupling hybrid loading unit, 7. Laser displacement sensor, 8. Electric spindle installation Table, 9. Bearing-loaded rotating unit, 10. Dynamometer adjustment mechanism, 11. Industrial computer, 12. Drive shaft, 13. Rotary table, 14. Fixed bracket, 15. Rotary motor, 16. Electric spindle, 17. Angle Indicating plate, 18. Electric spindle support, 19. Spindle clamp, 20. Locking bolt, 21. Dynamometer, 22. Dynamometer fixing plate, 23. Rotary disk, 24. Dynamometer rotating fixed table, 25 .Position adjuster, 26. Arc guide rail, 27. Electro-hydraulic servo loading mechanism, 28. Loading angle adjustment mechanism, 29. Base, 30. Loading mechanism shell, 31. Analog knife handle, 32. Cover I, 33. Bearing, 34. Heating ring, 35. Diaphragm coupling, 36. Sleeve, 37. Bearing sealing ring, 38. Cover II, 39. Bearing loaded rotating unit shell, 40. Turbine, 41. Worm, 42. Drive motor, 43. Dimple, 44. Loading point.

specific embodiment

The electric spindle reliability test device with multi-physical field composite loading according to the present invention is composed of four parts: a loading unit, an electric spindle position adjustment device, a performance detection device and an auxiliary equipment device.

The loading unit includes an electro-hydraulic servo loading device 2, a bearing coupling hybrid loading unit 6, a bearing loading rotation unit 9 and a dynamometer adjustment mechanism 10;

The electric spindle position adjustment device includes a main bracket 5 and an electric spindle installation platform 8;

The performance detection device includes detection equipment such as a laser displacement sensor 7;

The auxiliary equipment includes a ground level iron 1 , a cooling control cabinet 3 , a hydraulic station 4 and an industrial computer 11 .

Referring to Fig. 1, the electro-hydraulic servo loading device 2 and the main support 5 are installed on the horizontal iron 1, the laser displacement sensor 7, the electric spindle installation platform 8, and the dynamometer adjustment mechanism 10 are vertically installed on the main support 5, and the bearing coupling The mixer mixing loading unit 6 and the bearing loading rotating unit 9 are installed between the electric spindle installation platform 8 and the dynamometer adjustment mechanism 10, and the cooling control cabinet 3, the hydraulic station 4, and the industrial computer 11 are placed on the ground. The functions of the main components are as follows:

The electro-hydraulic servo loading device 2 realizes the loading of the magnitude and direction of the simulated cutting force on the spindle; the cooling control cabinet 3 provides coolant for the spindle, and there is a flow control valve in it, which can control the flow of coolant according to demand;

The hydraulic station 4 provides pulling force for the broach mechanism inside the electric spindle 16 to realize the replacement or disassembly of the mixed loading unit 6 of different bearing couplings;

The main bracket 5 realizes the rotation of the entire electrical spindle reliability test device in the vertical plane around the cutting force loading end, thereby simulating the actual machining process of the electrical spindle in horizontal, vertical, and tilted working conditions at various angles;

The laser displacement sensor 7 is fixed on the surface of the main support 5 by using a magnetic suction seat, and the position is adjusted so that the detection light emitted by the laser displacement sensor 7 is aligned with the electric spindle 16 and is close to the nearest end of the laser displacement sensor 7, so that the detected displacement value is the smallest, which can realize Detection of parameters such as radial runout and rotation accuracy of the electric spindle 16.

The electric spindle mounting table 8 realizes the installation of the electric spindle 16 and has a position adjustment function;

The dynamometer adjustment mechanism 10 realizes the bending condition of simulating the cutting torque to the main shaft;

The industrial computer 11 realizes the parameter acquisition and control function of the entire reliability test system, and can display the operating status of the test device on the display at the same time.

Referring to FIGS. 1 and 2 , the main support 5 includes a drive shaft 12 , a rotating table 13 , a fixed support 14 and a rotating motor 15 . A laser displacement sensor 7, an electric spindle installation platform 8, and a dynamometer adjustment mechanism 10 are installed on the fixed bracket 14. When the drive motor 15 drives the rotary table 13 to rotate around the drive shaft 12, the actual machining process of the electric spindle can be simulated. , Vertical and tilted working conditions at various angles are more conducive to the simulation of the real working conditions of the electric spindle.

Referring to FIG. 3 , the spindle installation platform 8 includes an electric spindle 16 , an angle indicating plate 17 , an electric spindle bracket 18 , a spindle clamp 19 and a locking bolt 20 . The main shaft holding clip 19 is installed on the outer ring of the entire electric main shaft 16 , and is connected with the electric main shaft bracket 18 by locking bolts 20 on both sides thereof, so as to realize the fixing of the electric main shaft 16 . The electric spindle support 18 is installed on the rotary table 13 . The angle indicating disc 17 is installed on the end of the electric spindle 16 . Pull the handle to rotate the electric spindle 16 to the corresponding scale position, and then fix the spindle clamp 19 with the locking bolt 20, so that the installation position can be adjusted.

When the electric spindle 16 needs to be rotated, loosen the locking bolt 20, adjust the electric spindle 16 to a proper position by using the handle at the 0° position of the angle dial according to the scale indication of the angle indicator dial 17, fix the spindle clamp 19 and lock it. Tighten the bolts.

Referring to FIG. 4 , the dynamometer adjustment mechanism 10 includes a dynamometer 21 , a dynamometer fixing plate 22 , a rotating disk 23 , a dynamometer rotating fixing table 24 and position adjusters 25 (four). The dynamometer 21 is fixed on the dynamometer fixing plate 22 by bolts, and the dynamometer fixing plate 22 is installed on the rotating disk 23 in the dynamometer rotating fixed table 24, and is installed on the dynamometer rotating fixed plate during bending loading. The rotating disc 23 in the table 24 drives the fixed plate 22 of the dynamometer to rotate, thereby driving the dynamometer 21 on the fixed plate to rotate.

The motor drives the rotating disk 23 to rotate, thereby driving the dynamometer 21 and the dynamometer fixing plate 22 to rotate together, simulating the bending condition of the main shaft and applying torque to the main shaft.

The four position adjusters 25 are uniformly fixed on the rear part of the dynamometer rotating fixed table 24, and are installed on the rotating table 13 of the main support 5, so that the entire dynamometer adjusting mechanism 10 can be horizontally moved to a suitable position. The rotational movement of the dynamometer rotating fixed table 24 plus the linear adjustment along the horizontal direction can simulate misalignment at any angle, thereby applying a bending moment. Refer to FIG. 9 for a schematic diagram of the principle.

Referring to FIG. 5 , the electro-hydraulic servo loading device 2 includes an arc-shaped guide rail 26 , an electro-hydraulic servo loading mechanism 27 , a loading angle adjustment mechanism 28 and a base 29 . The arc guide rail 26 is installed on the horizontal iron 1, the base 29 can slide on the arc guide rail 26, the loading angle adjustment mechanism 28 is fixed on the base 29, and there is an arc groove on the loading angle adjustment mechanism 28, the electro-hydraulic servo loading mechanism The two sides of the lower bottom plate of 27 are installed in the arc groove of the loading angle adjustment mechanism 28, and the angle adjustment of the electro-hydraulic servo loading mechanism 27 is realized through the rotation in the arc groove, so as to realize the multi-free dynamic cutting force loading of the electric spindle .

Firstly, both sides of the lower bottom plate of the electro-hydraulic servo loading mechanism 27 are installed on the loading angle adjustment mechanism 28, and the angle adjustment is realized by rotating on the track of the loading angle adjustment mechanism 28.

Secondly, the base 29 can slide along the arc-shaped guide rail 26, and then drive the electro-hydraulic servo loading mechanism 27 and the loading angle adjustment mechanism 28 fixed above the base to slide as a whole. If it is necessary to adjust the height of the electro-hydraulic servo loading device 2, you can use Adjusting the height of the base 29 is realized, thereby realizing dynamic cutting force loading of the spindle with multiple degrees of freedom. The projection line of the intersection point of the loading direction and the axis of the electric spindle 16 in the direction of the vertical horizontal iron 1 passes through the center of the arc guide rail 26. In the process of sliding along the arc-shaped guide rail 26, the loading point 44 (ie, the front end of the electro-hydraulic servo loading mechanism 27) is always in contact with the pit 43 on the surface of the loading mechanism shell 30 in the mixed loading unit 6 of the bearing coupling, and the test is stable. load. At the same time, when the turntable 13 rotates, the loading point 44 will not change.

Referring to Fig. 1, Fig. 4 and Fig. 6, the bearing coupling hybrid loading unit 6 includes a loading mechanism housing 30, a simulated handle 31, a heating ring 34, a diaphragm coupling 35, a bearing 33, a sleeve 36, Bearing sealing ring 37 and cover I32, cover II38.

The simulated knife handle 31 is connected to the diaphragm coupling 35 , and the heating ring 34 is installed outside the diaphragm coupling 35 , that is, the front end of the simulated knife handle 31 . The bearing coupling hybrid loading unit 6 can realize multiple functions, including connecting the electric spindle 16 and the dynamometer 21 and applying torque, transmitting the dynamic cutting force applied by the electro-hydraulic servo loading device 2 to the electric spindle 16, applying the dynamic cutting force due to the dynamometer 21 The functions of bending deformation generated by the adjustment mechanism 10 to the electric spindle 16 and applying heat to the front end of the electric spindle 16 are these functions.

The electro-hydraulic servo loading device 2 is in contact with the pit 43 on the surface of the loading mechanism shell 30 to realize the loading of cutting force. The electric spindle 16 fixed by the spindle mounting table 8 is connected with the dynamometer 21 through the diaphragm coupling 35 to realize the loading of the electric spindle 16 with torque. Heating the front end of the simulated tool handle 31 through the heating ring 34 can better simulate the influence of the electric spindle 16 on the dynamic and static stress after thermal deformation, and better simulate the actual working conditions.

Referring to FIG. 1 , FIG. 6 , and FIG. 7 , the bearing-loaded rotating unit 9 described in FIG. 9 includes a bearing-loaded rotating unit housing 39 , a turbine 40 , a worm 41 and a driving motor 42 .

When the loading direction of the electro-hydraulic servo loading device 2 changes, in order to ensure that the loading point 44 is always in contact with the pit 43 on the surface of the loading mechanism shell 30, the drive motor 42 needs to be driven by a worm gear, and the bearing coupling hybrid loading unit 6 The bottom cover II 38 cooperates with the turbine 40 to rotate the entire bearing coupling hybrid loading unit 6 to a position corresponding to the electro-hydraulic servo loading device 2 to realize the cutting force loading of the electric spindle 16 .

The sleeve cover II38 in the hybrid loading unit 6 of the bearing coupling is in interference fit with the turbine 40, and the output end of the drive motor 42 is directly connected with the worm 41 to drive the turbine 40 to rotate, so that the entire hybrid loading unit 6 of the bearing coupling rotates around the electric spindle 16 turns. Realize that in the process of sliding the base 29 of the electro-hydraulic servo loading mechanism 27 along the arc guide rail 26, the position of the loading point 44 is automatically corrected according to the angular relationship, so as to ensure that the loading point 44 (that is, the front end of the electro-hydraulic servo loading mechanism 27) is always in contact with the bearing The tor mix loading unit maintains contact for accurate loading.

Referring to Fig. 8, the working principle of the electro-spindle reliability test device described in this patent can be divided into four parts: loading, electro-spindle position adjustment, performance testing and other expressions.

They are described as follows:

The loading part includes cutting force loading, cutting torque loading, bending force loading and thermal loading. The cutting force loading includes cutting force size control and direction control. The cutting force is controlled by the electro-hydraulic servo loading mechanism 27; the cutting force direction is controlled by the loading angle adjustment mechanism 28 and the arc guide rail 26; the cutting torque is loaded by the dynamometer 21; the bending force is adjusted by the dynamometer Implemented by agency 10. The heat loading part is realized by heating the front end of the spindle tool handle with the heating ring 34 .

The position adjustment of the electric spindle is realized by two parts: the rotation of the rotary table 13 and the adjustment of the installation position of the spindle. The rotary motor 15 drives the rotary table 13 to rotate around the drive shaft 12, thereby driving the electric spindle installation table 8 fixed on the rotary table 13 to rotate as a whole; the spindle installation position is adjusted according to the scale indication of the angle indicator plate 17, and the angle dial 0° The position handle adjusts the position of the electro-spindle 16 .

The performance detection part includes a laser displacement sensor 7 and other detection equipment to realize the detection of parameters such as the radial runout of the main shaft and the rotation accuracy.

Other parts include the cooling control cabinet 3 to provide cooling liquid, the hydraulic station 4 to provide pulling force for the broach mechanism inside the electric spindle 16, and the industrial computer 11 to realize the parameter collection and control functions of the entire reliability test system.

The examples described in the present invention are for those skilled in the art to understand and apply the present invention. The present invention is only an example of optimization, or a better specific technical solution. If the relevant technical personnel adhere to the basic technical solution of the present invention, they can make equivalent structural changes or various technical solutions that do not require creative work. Modifications are within the protection scope of the present invention.

Claims (7)

1. A multi-physics field composite loading electro-spindle reliability test device, comprising a loading unit, an electro-spindle position adjustment device, a performance detection device and an auxiliary equipment device, characterized in that: The loading unit includes an electro-hydraulic servo loading device (2), a bearing coupling mixing loading unit (6), a bearing loading rotation unit (9) and a dynamometer adjustment mechanism (10); The electric spindle position adjustment device includes a main support (5) and an electric spindle installation table (8); The performance detection device includes a laser displacement sensor (7); The laser displacement sensor (7), the electric spindle installation platform (8) and the dynamometer adjustment mechanism (10) are fixed on the rotary table (13) in the main support (5); The electro-hydraulic servo loading device (2) and the main support (5) are installed on the ground level iron (1) in the auxiliary equipment device; The bearing coupling mixing loading unit (6) and the bearing loading rotating unit (9) are installed between the electric spindle installation table (8) and the dynamometer adjustment mechanism (10); Described main support (5) also comprises drive shaft (12), fixed support (14) and rotating motor (15); Fixed support (14) is fixed on the rotary table (13), and laser Displacement sensor (7), motorized spindle mounting table (8) and dynamometer adjustment mechanism (10); drive motor (15) drives rotary table (13) to rotate around drive shaft (12), thereby driving the rotary table (13) ) on the laser displacement sensor (7), the electric spindle mounting table (8) and the dynamometer adjustment mechanism (10) are rotated to realize the rotation of the whole test device around the drive shaft (12), thereby simulating the different tilt states of the spindle during cutting Stress situation; The dynamometer adjustment mechanism (10) includes a dynamometer (21), a dynamometer fixing plate (22), a rotating disk (23), a dynamometer rotating fixed table (24) and a position adjuster (25); The dynamometer (21) is installed on the dynamometer fixed plate (22), and the dynamometer fixed plate (22) is installed on the rotating disc (23) in the dynamometer rotating fixed table (24), and the motor drives The rotating disc (23) rotates, thereby driving the dynamometer (21) and the dynamometer fixed plate (22) to rotate together; The position adjuster (25) is fixed on the rear portion of the dynamometer rotating fixed table (24), and is installed on the rotating table (13) of the main support (5); The bearing coupling hybrid loading unit (6) includes a loading mechanism housing (30), a simulated handle (31), a heating ring (34), and a diaphragm coupling (35); A pit (43) is provided on the surface of the loading mechanism shell (30); The simulated knife handle (31) is connected with the diaphragm coupling (35), and the heating ring (34) is installed on the outside of the diaphragm coupling (35); One end of the diaphragm coupling (35) is connected to the electric spindle (16), and the other end is connected to the dynamometer (21). 2. The electro-spindle reliability test device with multi-physical field compound loading according to claim 1, characterized in that: The electric spindle installation platform (8) includes an electric spindle (16), an angle indicator plate (17), an electric spindle support (18), a spindle clamp (19) and a locking bolt (20); The spindle clamp (19) is installed on the outer ring of the electric spindle (16) to fix the electric spindle (16); the electric spindle support (18) is installed on the rotary table (13); the angle indicator plate (17) is installed At the end of the electric spindle (16). 3. The electro-spindle reliability test device with multi-physical field composite loading according to claim 1, characterized in that: The electro-hydraulic servo loading device (2) includes an arc guide rail (26), an electro-hydraulic servo loading mechanism (27), a loading angle adjustment mechanism (28) and a base (29); The arc guide rail (26) is installed on the horizontal iron (1), the base (29) can slide on the arc guide rail (26), the loading angle adjustment mechanism (28) is fixed on the base (29), and the loading angle adjustment mechanism ( 28) is provided with an arc-shaped groove, and the two sides of the lower bottom plate of the electro-hydraulic servo loading mechanism (27) are installed in the arc-shaped groove of the loading angle adjustment mechanism (28), and the electro-hydraulic servo servo is realized by rotating in the arc-shaped groove. Angle adjustment of loading mechanism (27). 4. A multi-physics-field compound-loaded electro-spindle reliability test device according to claim 1, characterized in that: The bearing-loaded rotating unit (9) includes a turbine (40), a worm (41), and a drive motor (42); The output end of the drive motor (42) is directly connected to the worm (41) to drive the turbine (40) to rotate; The turbine (40) cooperates with the bottom cover II (38) of the mixing loading unit (6) of the bearing coupling. 5. A multi-physics-field composite loading electric spindle reliability test device according to claim 2, characterized in that: The horizontal projection of the axis of the electric spindle (16) is on the center of the arc guide rail (26) in the electro-hydraulic servo loading device (2), and the base (29) slides along the arc guide rail (26). The loading point (44) at the front end of the electro-hydraulic servo loading mechanism (27) in the hydraulic servo loading device (2) is always mixed with the bearing coupling The pit (43) on the surface of the loading mechanism shell (30) in the loading unit (6) Stay in touch. 6. A multi-physics-field composite loading electro-spindle reliability test device according to claim 1, characterized in that: The laser displacement sensor (7) is fixed on the surface of the main support (5) by using a magnetic suction seat, and the position is adjusted so that the laser head of the laser displacement sensor (7) is aligned with the electric spindle (16) and is close to the nearest end of the laser displacement sensor (7), so that The detected displacement value is the smallest, and the detection of radial runout and rotation precision parameters of the electric spindle (16) is realized. 7. A multi-physics-field composite loading electric spindle reliability test device according to claim 1, characterized in that: The auxiliary equipment device also includes a cooling control cabinet (3), a hydraulic station (4) and an industrial computer (11); The cooling control cabinet (3), the hydraulic station (4), and the industrial computer (11) are placed on the ground; The cooling control cabinet (3) provides cooling liquid for the main shaft, and is provided with a flow control valve, which can control the flow of cooling liquid; The hydraulic station (4) provides pulling force for the broach mechanism inside the electric spindle (16); The industrial computer (11) realizes the parameter acquisition and control functions of the entire reliability test system, and can display the operating status of the test device on the display at the same time.

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