A comprehensive electric spindle reliability loading test device

Abstract

The invention discloses a comprehensive electric spindle reliability loading test device. In order to overcome the problem that the prior art cannot test multiple reliability indicators of the electric spindle under different conditions, the test device comprises an electric spindle movement positioning system, a low-frequency and low-speed electric spindle reliability loading test system, a high-frequency and high-speed electric spindle reliability loading test system, an electric spindle broaching mechanism reliability test system and a ground iron; the electric spindle movement positioning system is installed on the ground iron through a No. 1 precision ball screw and a No. 2 precision ball screw, the low-frequency and low-speed electric spindle reliability loading test system is installed on the ground iron between the No. 1 precision ball screw and the No. 2 precision ball screw, the high-frequency and high-speed electric spindle reliability loading test system is installed on the ground iron on the left side of the low-frequency and low-speed electric spindle reliability loading test system, and the electric spindle broaching mechanism reliability test system is installed on the ground iron on the left side of the high-frequency and high-speed electric spindle reliability loading test system.

Description

Technical Field

[0001] The invention relates to a test device belonging to the technical field of mechanical equipment reliability testing, and more specifically, to a comprehensive electric spindle reliability loading test device. Background Art

[0002] In recent years, the mechanical manufacturing industry has developed particularly rapidly, and the development of CNC machine tools as industrial mother machines has become more urgent. As a key component of CNC machine tools, the reliability of the electric spindle will directly affect the accuracy and stability of CNC machine tools. Therefore, promoting the research on the reliability technology of the electric spindle is of great significance to the development of my country's mechanical manufacturing industry.

[0003] At present, there are many test devices and test methods for the reliability test of electric spindles in China. It is worth noting that when the reliability test is carried out for the same reliability index of the same electric spindle, the reliability test results of the electric spindle under different conditions may show differences. For example, the loading accuracy of the electric spindle under low-frequency and low-speed simulation conditions is within the error range, but the loading accuracy of the electric spindle under high-frequency and high-speed simulation conditions may exceed the allowable error range. Furthermore, reliability tests on a single performance index of a single electric spindle often cannot reflect the comprehensive performance of the electric spindle. For example, the loading accuracy of a certain electric spindle under high-frequency and high-speed simulation conditions is within the allowable error range, but when conducting reliability tests on the electric spindle broaching mechanism, the reliability performance indicators of the electric spindle such as the broaching force and rotation accuracy exceed the normal threshold. Such an electric spindle still does not meet the requirements of actual engineering applications. As for the current reliability loading test devices for electric spindles in China, most of them conduct reliability tests on a single performance index of the electric spindle under certain conditions, but there are few comprehensive reliability test devices that can meet the requirements of multiple performance indexes of the spindle under different conditions. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the problem that the prior art cannot test multiple reliability indicators of the electric spindle under different conditions, and provide a fully automatic, multi-working condition, multi-indicator comprehensive electric spindle reliability loading test device.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0006] The comprehensive electric spindle reliability loading test device comprises an electric spindle moving positioning system, a low-frequency and low-speed electric spindle reliability loading test system, a high-frequency and high-speed electric spindle reliability loading test system, an electric spindle broaching mechanism reliability test system and a ground level iron;

[0007] The floor iron is a rectangular plate casting, the top of the floor iron is provided with T-shaped grooves of the same structure and parallel to each other, the bottom of the floor iron is provided with a weight reduction groove, and two rectangular grooves are provided in the middle of the top of the floor iron;

[0008] The electric spindle moving positioning system is installed on the horizontal iron through the No. 1 precision ball screw and the No. 2 precision ball screw, the low-frequency and low-speed electric spindle reliability loading test system is installed on the horizontal iron between the No. 1 precision ball screw and the No. 2 precision ball screw, the high-frequency and high-speed electric spindle reliability loading test system is installed on the horizontal iron on the left side of the low-frequency and low-speed electric spindle reliability loading test system, and the electric spindle broaching mechanism reliability test system is installed on the horizontal iron on the left side of the high-frequency and high-speed electric spindle reliability loading test system; the electric spindle in the electric spindle moving positioning system, the low-frequency and low-speed loading unit in the low-frequency and low-speed electric spindle reliability loading test system, the high-frequency and high-speed loading unit in the high-frequency and high-speed electric spindle reliability loading test system and the electric spindle broaching mechanism reliability test system The rotation axis of the 8 broaching mechanism simulated tool handles with the same structure are perpendicular to the horizontal iron.

[0009] The electric spindle moving positioning system described in the technical solution also includes an electric spindle simulated tool holder matching device and a mobile gantry; the No. 1 precision ball screw and the No. 2 precision ball screw are symmetrically installed on the front and rear sides of the horizontal iron by T-shaped bolts, and the longitudinal symmetry planes of the No. 1 precision ball screw and the No. 2 precision ball screw are parallel to the longitudinal symmetry plane of the horizontal iron; the mobile gantry is installed on the No. 1 precision ball screw and the No. 2 precision ball screw by bolts and through the three connecting plates at the bottom ends of the front and rear pillars, and the front side screw nut seat and the rear side screw nut seat at the bottom end of the connecting plate at the bottom end of the main pillar in the front and rear pillars of the mobile gantry and the screw nuts on the No. 1 precision ball screw and the No. 2 precision ball screw are assembled and fixed with screws; the electric spindle simulated tool holder matching device is installed on the middle beam of the mobile gantry through the No. 4 precision ball screw and is fixed with bolts.

[0010] The electric spindle simulated tool holder matching device described in the technical solution also includes No. 3 precision ball screw, a tool-beating cylinder, a vertical guide rail mounting plate, a spindle water jacket, a spindle clamp and a joint plate; wherein: No. 3 precision ball screw and No. 4 precision ball screw have the same structure;

[0011] The No. 4 precision ball screw is horizontally fixed and installed in the middle of the middle beam of the mobile gantry with bolts, the No. 3 precision ball screw is fixed to the vertical guide rail mounting plate with bolts, the No. 3 guide rail slider in the No. 3 precision ball screw is fixedly connected to the connecting plate with screws, and the connecting plate with the No. 3 precision ball screw is installed on the No. 4 guide rail slider in the No. 4 precision ball screw with bolts; the electric spindle is installed in the spindle water jacket and fixedly connected with bolts, the spindle water jacket with the electric spindle is installed in the spindle clamp and fixedly connected with bolts, the top of the electric spindle is installed with a spindle cutting cylinder, and the spindle clamp is fixedly connected to the lower end of the left side wall of the vertical guide rail mounting plate with bolts.

[0012] The mobile gantry described in the technical solution is a large-scale portal structure made by casting. The mobile gantry includes a front support, a rear support and an intermediate crossbeam. The top ends of the front support and the rear support and the two ends of the intermediate crossbeam are vertically connected to form an integrated portal structure. The front support and the rear support have the same structure. Both the front support and the rear support are composed of a main support, a left auxiliary support and a right auxiliary support. The left auxiliary support and the right auxiliary support have the same structure. The left auxiliary support and the right auxiliary support are symmetrically arranged on the left and right sides of the main support. The top ends of the left and right auxiliary supports and the left and right side walls of the lower ends of the main supports are connected as a whole; a group of three connecting plates are fixed to the bottom ends of the front support and the rear support, respectively, wherein the connecting plates on the bottom ends of the left and right auxiliary supports have the same structure, and each group of three Each of the connecting plates is a rectangular plate-like structural member, and each connecting plate is evenly provided with 4 groups of 16 bolt holes, and each group of bolt holes on the connecting plate is concentric with the threaded holes on the No. 1 guide slider and the No. 2 guide slider in the No. 1 precision ball screw and the No. 2 precision ball screw. The front screw nut seat and the rear screw nut seat matched with the No. 1 screw nut and the No. 2 screw nut on the No. 1 precision ball screw and the No. 2 precision ball screw are fixed at the center of the bottom end of the connecting plate of the main pillar in the front pillar and the rear pillar. The mobile gantry is fixedly connected by screws through 3 connecting plates at the bottom ends of the front pillar and the rear pillar and 12 No. 1 guide sliders and 12 No. 2 guide sliders with the same structure on the No. 1 precision ball screw and the No. 2 precision ball screw.

[0013] The low-frequency and low-speed electric spindle reliability loading test system described in the technical solution also includes a low-frequency and low-speed radial force loading device, a low-frequency and low-speed torque loading device and a low-frequency and low-speed axial force loading device; the low-frequency and low-speed radial force loading device is fixed on the ground level iron through the support plate therein; the low-frequency and low-speed loading unit is vertically installed on the front side of the low-frequency and low-speed radial force loading device, the low-frequency and low-speed axial force loading device is installed on the front side of the low-frequency and low-speed loading unit, and the low-frequency and low-speed torque loading device is installed on the low-frequency and low-speed loading unit through the dynamometer base therein. The low-frequency, low-speed radial force loading ball socket on the low-frequency, low-speed radial force loading device is aligned and concentric with the low-frequency, low-speed radial force loading ball head installed on the low-frequency, low-speed loading unit. The dynamometer in the low-frequency, low-speed torque loading device is installed on the dynamometer base, and the drive shaft of the dynamometer is key-connected to the No. 1 bevel gear on the low-frequency, low-speed loading unit. The low-frequency, low-speed axial force loading device is symmetrically fixed to the No. 1 bearing sleeve of the low-frequency, low-speed loading unit through the No. 1 loading fork and two lever pull nails with the same structure.

[0014] The low-frequency and low-speed radial force loading device described in the technical solution includes a radial electro-hydraulic servo loader, an intermediate force plate, two brackets with identical structures, a support plate, a low-frequency and low-speed radial force loading ball socket and a low-frequency and low-speed radial force loading ball head; the two brackets with identical structures are symmetrically installed on the left and right ends of the support plate, the bottom ends of the two brackets with identical structures and the left and right ends of the support plate are connected by bolts, the intermediate force plate is installed on the top of the two brackets with identical structures, the radial electro-hydraulic servo loader is installed on the intermediate force plate, the radial electro-hydraulic servo loader, the intermediate force plate and the tops of the two brackets with identical structures are contacted and connected in turn, and the three are fixedly connected by bolts; the low-frequency and low-speed radial force loading ball socket is installed on the force sensor at the rightmost end of the radial electro-hydraulic servo loader, and the low-frequency and low-speed radial force loading ball head is installed on the low-frequency and low-speed loading unit.

[0015] The low-frequency and low-speed axial force loading device described in the technical solution includes an axial electro-hydraulic servo loader, a low-frequency and low-speed axial force loading ball head, a low-frequency and low-speed axial force loading ball socket, a lever support seat, a lever, a lever rivet and a No. 1 loading fork; the axial electro-hydraulic servo loader is vertically installed in a rectangular groove set in the middle of the ground iron, and is fixedly connected to the ground iron with bolts, the lever support seat is installed on the ground iron on the left side of the axial electro-hydraulic servo loader and is fixedly connected with bolts, the lever is installed on the No. 1 support shaft of the lever support seat through a through hole in the middle thereof for a rotational connection, the low-frequency and low-speed axial force loading ball head is fixed to the rightmost end of the lever with a threaded connection, and is concentric with the spherical groove of the low-frequency and low-speed axial force loading ball socket fixed at the top of the axial electro-hydraulic servo loader, the No. 1 loading fork is installed at the leftmost end of the lever, and two lever rivets with the same structure are symmetrically installed on the No. 1 loading fork, and the two are rotationally connected.

[0016] The low-frequency and low-speed loading unit (202) described in the technical solution comprises a bearing upper end cover, a bearing sleeve, a bearing lower end cover, a No. 1 bearing, a No. 1 gasket, a No. 1 locking nut, a No. 1 sleeve, a low-frequency and low-speed simulated tool handle, a No. 2 bearing, a bearing retaining ring, a No. 2 gasket, a No. 2 locking nut, a sleeve, a No. 1 bevel gear, a No. 2 bevel gear and a No. 3 bearing;

[0017] The upper end cover of the bearing, the bearing sleeve, and the lower end cover of the bearing are mounted on the low-frequency and low-speed simulation tool holder from top to bottom. Two bearing retaining rings, No. 2 gaskets, and No. 2 locking nuts with the same structure are located on the inner side of the upper end cover of the bearing, the bearing sleeve, and the lower end cover of the bearing, and are mounted on the low-frequency and low-speed simulation tool holder from top to bottom at the same time. The bearing retaining ring is located between two No. 2 bearings with the same structure. The upper and lower end faces of the bearing retaining ring are respectively in contact with the lower and upper end faces of the outer bearing rings of the two No. 2 bearings with the same structure. The No. 2 gasket is installed between the No. 2 bearing and the No. 2 locking nut located below. The upper and lower end faces of the No. 2 gasket are respectively The bottom end face of the inner bearing ring of the No. 2 bearing located below and the top end face of the No. 2 locking nut are respectively in contact and connected, the top end face of the inner bearing ring of the No. 2 bearing located above is in contact and connected with the upper shaft shoulder on the low-frequency and low-speed simulation tool handle, the No. 2 locking nut and the low-frequency and low-speed simulation tool handle are threadedly connected, the inner bearing rings of the two No. 2 bearings (202-09) with the same structure and the low-frequency and low-speed simulation tool handle are statically matched, the outer bearing rings of the two No. 2 bearings with the same structure and the bearing sleeve are transitionally matched, and the upper end cover of the bearing and the lower end cover of the bearing are respectively fixedly connected to the top and bottom ends of the bearing sleeve by screws;

[0018] Bearing No. 1 is mounted on the low-frequency and low-speed simulation tool holder, the top end surface of the bearing ring inside bearing No. 1 is in contact connection with the shaft shoulder at the middle position of the low-frequency and low-speed simulation tool holder, bevel gear No. 1 is mounted on the low-frequency and low-speed simulation tool holder, a key connection is adopted between the two, the top end surface of bevel gear No. 1 is in contact connection with the shaft shoulder at the lower end position of the low-frequency and low-speed simulation tool holder, the sleeve is installed between bearing No. 1 and bevel gear No. 1, gasket No. 1 and locking nut No. 1 are installed under bevel gear No. 1, and the three are contact connected in sequence; bevel gear No. 2 and bearing No. 3 are mounted on the transmission shaft of the dynamometer in the low-frequency and low-speed torque loading device, sleeve No. 1 is mounted on the transmission shaft of the dynamometer between bevel gear No. 2 and bearing No. 3, the three are contact connected in sequence, and bevel gear No. 1 and bevel gear No. 2 are meshingly connected.

[0019] The high-frequency and high-speed electric spindle reliability loading test system described in the technical solution also includes a high-frequency and high-speed radial mean force loading device, a high-frequency and high-speed radial amplitude force loading device, a drag torque loading device and a high-frequency and high-speed axial force loading device; the high-frequency and high-speed radial mean force loading device is fixed to the ground iron through the mean electric cylinder support seat and bolts, the high-frequency and high-speed radial amplitude force loading device is installed on the right side of the high-frequency and high-speed radial mean force loading device and is fixedly connected by bolts between the base of the amplitude vibration table and the ground iron, the high-frequency and high-speed loading unit is installed between the high-frequency and high-speed radial mean force loading device and the high-frequency and high-speed radial amplitude force loading device, the No. 1 pull nail in the high-frequency and high-speed radial mean force loading device is fixedly installed on the left side of the No. 2 bearing sleeve in the high-frequency and high-speed loading unit, and the high-frequency and high-speed radial amplitude force loading device is fixedly installed on the left side of the No. 2 bearing sleeve in the high-frequency and high-speed radial amplitude force loading device. The radial amplitude force loading ball socket in the force loading device is assembled and concentrically aligned with the force ball head of the high-frequency high-speed loading unit on the right side of the high-frequency high-speed loading unit. The high-frequency high-speed axial force loading device is installed directly below the high-frequency high-speed loading unit and fixedly installed on the ground iron through two guide column support seats with the same structure. The upper end of the high-frequency high-speed axial force loading device is fixedly connected to the front and rear sides of the No. 2 bearing sleeve in the high-frequency high-speed axial force loading device through two axial force ear assemblies with the same structure; the drag torque loading device is located between two guide column support seats with the same structure. The drag torque loading device is clamped by the drag electric spindle and fixedly connected to the groove on the ground iron with bolts. The coupling at the top of the drag torque loading device is matched with the stepped shaft at the lower end of the high-frequency high-speed simulated tool holder in the high-frequency high-speed loading unit.

[0020] The high-frequency and high-speed radial mean force loading device described in the technical solution includes a mean electric cylinder, a mean electric cylinder support seat, an electric cylinder connecting sleeve, a force sensor, a loading wire rope, No. 1 rivet and No. 2 rivet; the mean electric cylinder is installed on a supporting plate in the mean electric cylinder support seat, and at the same time, the right side of the mean electric cylinder is fixed to the supporting wall in the mean electric cylinder support seat by screws, and the right end of the telescopic shaft of the mean electric cylinder is inserted into the through hole at the upper end of the supporting wall in the mean electric cylinder support seat and then assembled and connected with the threaded hole at the left end of the electric cylinder connecting sleeve, the short screw on the right side of the electric cylinder connecting sleeve is assembled and connected with the threaded hole on the left side of the force sensor, and the threaded hole at the right end of the force sensor is assembled and connected with the short screw on the left side of the No. 2 rivet, and the left and right ends of the loading wire rope pass through the center through holes of the No. 2 rivet and the No. 1 rivet respectively and are fixedly connected to form a wire rope closed loop.

[0021] The high-frequency and high-speed axial force loading device described in the technical solution also includes two guide column support seats with identical structures, an axial force sensor, two No. 2 loading forks with identical structures, a push plate, a nut, a pull rod (305-10), a high-frequency and high-speed axial force loading electric cylinder, four No. 1 guide column fixing sleeves with identical structures, a No. 1 support plate, two push plate guide sleeves with identical structures, two push plate guide columns with identical structures, two top wheels with identical structures and two steel pins with identical structures; the two guide column support seats with identical structures are symmetrically distributed on the left and right sides, and the two push plate guide columns with identical structures are symmetrically installed in the semi-cylindrical grooves at the upper ends and the middle of the two guide column support seats with identical structures using four No. 1 guide column fixing sleeves with identical structures and bolts, the No. 1 support plate is mounted on the two push plate guide columns with identical structures through two push plate guide sleeves with identical structures, and the axial force sensor It is installed at the center of the top surface of the No. 1 support plate and fixed with bolts, the push plate is fixed at the center of the top of the axial force sensor with screws, the bottom ends of the two No. 2 loading forks with the same structure are fixed with bolts at the front and back of the top of the push plate, the upper ends of the two No. 2 loading forks with the same structure are rotatably connected with two steel pins with the same structure and two top wheels with the same structure, and two axial force ear assemblies with the same structure are mounted on the upper ends of the two No. 2 loading forks with the same structure, and at the same time, four steel wire ropes with the same structure in the two axial force ear assemblies with the same structure are located above and below the two top wheels with the same structure; the high-frequency and high-speed axial force loading electric cylinder is installed below the lower right corner of the No. 1 support plate, the lower end of the pull rod is threadedly connected to the output end of the telescopic shaft of the high-frequency and high-speed axial force loading electric cylinder, and the upper end of the pull rod is inserted into the bolt hole at the lower right corner of the No. 1 support plate and is locked and fixed with a locking nut.

[0022] The reliability test system of the electric spindle broaching mechanism described in the technical solution also includes 8 counterweights, 8 tool holder mounting seats with the same structure, 8 dynamometers with the same structure, a gear mounting seat, a top plate, 2 top plate guide sleeves with the same structure, 2 top plate guide columns with the same structure, a reduction motor, an electric cylinder, 4 No. 2 guide column fixing sleeves with the same structure, a base, 4 support plate guide columns with the same structure, a No. 2 support plate, 4 guide column anti-slip sleeves with the same structure and a turntable; the base is fixed to the horizontal iron with bolts, the bottom ends of the 4 support plate guide columns with the same structure are installed at the four corners of the base, the 4 support plate guide columns with the same structure are perpendicular to the base, the 4 No. 2 guide column fixing sleeves with the same structure are installed on the lower ends of the 4 support plate guide columns with the same structure, and the 4 No. 2 guide column fixing sleeves with the same structure are fixed to the base with bolts; the No. 2 support plate is installed on the 4 support plate guide columns with the same structure through the guide column anti-slip sleeves installed at the four corners; the gear mounting seat is installed on the No. 2 support shaft through the No. 2 support shaft. The center of the No. 2 support plate is a rotating connection, the turntable is installed on the top of the No. 2 support shaft, and the two are key-connected. 8 tool holders with the same structure are installed in 8 circular stepped through holes on the turntable through 8 tool holder mounting seats with the same structure. 8 counterweights are mounted on the 8 tool holders with the same structure. 8 dynamometers with the same structure are installed in the threaded holes at the centers of the bottom ends of the 8 tool holders with the same structure by threaded connection; the reduction motor is installed under the No. 2 support plate and fixedly connected to the No. 2 support plate by screws, the power output shaft of the reduction motor is inserted into the small through hole of the No. 2 support plate and the inner ring hole of the bearing, and the power output shaft of the reduction motor is key-connected to the small gear in the gear mounting seat; the electric cylinder is installed on the base directly below the center of the No. 2 support plate, the telescopic shaft of the electric cylinder is fixedly connected to the center of the rectangular flat top plate, two top plate guide columns with the same structure are fixedly connected to the front and rear ends of the top plate by bolts, and the two top plate guide columns with the same structure are installed in two guide sleeves with the same structure on the electric cylinder for sliding connection.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention is automatically controlled by automation equipment throughout the process. The reliability test processes such as precise positioning of the electric spindle, centering of the electric spindle, tool change of the electric spindle, loading of the electric spindle, etc. can all be completed by automation equipment, which can greatly shorten the time of experimental processes such as spindle adjustment, and has the advantages of fast response, high loading measurement accuracy, high efficiency, etc., and at the same time provides reliable support for the accuracy and richness of data;

[0025] 2. The fully automatic, multi-condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention can establish a production line equivalent to an electric spindle test, and can test the reliability performance parameters of the same electric spindle sample under different simulated working conditions such as low frequency and low speed, high frequency and high speed, and drag loading, so that the reliability performance index parameters of the electric spindle under different simulated working conditions can be obtained, which can make up for the defect that most current electric spindle reliability test devices cannot perform reliability tests on the same index of the electric spindle under different simulated working conditions;

[0026] 3. The fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention can simulate different working conditions under different conditions to perform reliability tests on various reliability performance indicators of the electric spindle, such as testing the reliability performance index parameters of the loading accuracy of the electric spindle under low frequency and low speed conditions, testing the reliability performance index parameters of the loading accuracy and the dragging rotation accuracy of the electric spindle under high frequency and high speed conditions, and testing the reliability performance index parameters of the broaching force, average failure rate, etc. of the electric spindle under the reliability test conditions of the broaching mechanism of the electric spindle. Therefore, the comprehensive performance index parameters of the electric spindle can be obtained under the test device described in the present invention;

[0027] 4. The fully automatic, multi-working condition, multi-indicator comprehensive electric spindle reliability loading test device described in the present invention is capable of obtaining rich and coupled data for the electric spindle reliability performance indicators during the test, and creatively provides a method for obtaining reliability data for the study of the influence of the coupling and intersection of multiple factors on the reliability performance of the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings:

[0029] Figure 1 It is an axonometric projection view of the structural composition of a fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device according to the present invention;

[0030] Figure 2 It is an axonometric projection view of the structure of the electric spindle mobile positioning system used in the fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention;

[0031] Figure 3 It is an exploded isometric projection view of the structural composition of the electric spindle simulation tool handle matching device used in the electric spindle mobile positioning system of the present invention;

[0032] Figure 4 It is an axonometric projection view of the No. 4 precision ball screw structure used in the electric spindle mobile positioning system of the present invention;

[0033] Figure 5 It is an axonometric projection view of the structural composition of a low-frequency and low-speed electric spindle reliability loading test system used in a fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention;

[0034] Figure 6 It is a front view of the low-frequency and low-speed electric spindle reliability loading test system of the present invention;

[0035] Figure 7 It is a sectional view on the left side view of a low-frequency and low-speed loading unit in the low-frequency and low-speed electric spindle reliability loading test system of the present invention;

[0036] Figure 8 It is a cross-sectional view of a lever support seat in the low-frequency and low-speed electric spindle reliability loading test system of the present invention;

[0037] Fig. 9 It is an axonometric projection view of the structural composition of the high-frequency and high-speed electric spindle reliability loading test system used in the fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention;

[0038] Fig.10 It is an axonometric projection view of the structural composition of the high-frequency and high-speed radial force mean value loading device in the high-frequency and high-speed electric spindle reliability loading test system of the present invention;

[0039] Fig.11 The front view of the high-frequency and high-speed loading unit structure in the high-frequency and high-speed electric spindle reliability loading test system of the present invention

[0040] Fig.12 It is an axonometric projection view of the structural composition of the high-frequency and high-speed radial force amplitude loading device in the high-frequency and high-speed electric spindle reliability loading test system of the present invention;

[0041] Fig.13 It is an axonometric projection view of the structural composition of the drag torque loading device in the high-frequency and high-speed electric spindle reliability loading test system of the present invention;

[0042] Fig.14 It is an axonometric projection view of the structural composition of the high-frequency and high-speed axial force loading device in the high-frequency and high-speed electric spindle reliability loading test system of the present invention;

[0043] Fig.15 It is an exploded isometric projection view of the structural composition of the force transmission device of the high-frequency and high-speed axial force loading device in the high-frequency and high-speed electric spindle reliability loading test system of the present invention;

[0044] Fig.16It is a cross-sectional view of a force transmission device in a high-frequency and high-speed axial force loading device in a high-frequency and high-speed electric spindle reliability loading test system according to the present invention;

[0045] Fig.17 It is an axonometric projection view of the structural composition of the electric spindle broaching mechanism reliability test system used in the fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device described in the present invention;

[0046] Fig.18 It is a cross-sectional view of the gear mounting seat structure in the reliability test system of the electric spindle broaching mechanism of the present invention;

[0047] Fig.19 It is a cross-sectional view of the structure of the tool handle mounting seat in the reliability test system of the electric spindle broaching mechanism of the present invention;

[0048] In the figure: 1. Electric spindle mobile positioning system, 101-A. No. 1 precision ball screw, 101-B. No. 2 precision ball screw, 102. Electric spindle simulated tool holder matching device, 102-A. No. 3 precision ball screw, 102-B. No. 4 precision ball screw, 102-B-01.4 motor, 102-B-02.4 screw mounting seat, 102-B-03.4 guide rail slider, 102-B-04.4 screw nut, 102-B-05.4 screw, 102-B-06.4 guide rail, 102-B-07.4 base, 102-B-08.4 grating ruler, 102-B-09.4 grating ruler reading head, 102-B-10.4 reading head connecting plate, 1 02-B-11. No. 4 bearing seat, 102-01. Cylinder, 102-02. Vertical guide rail mounting plate, 102-03 Spindle water jacket, 102-04. Spindle clamp, 102-05. Electric spindle, 102-06. Joint plate, 103. Mobile gantry, 2. Low-frequency and low-speed electric spindle reliability loading test system, 201. Low-frequency and low-speed radial force loading device, 201-01. Radial electro-hydraulic servo loader, 201-02. Intermediate force plate, 201-03. Bracket, 201-04. Support plate, 201-05. Low-frequency and low-speed radial force loading ball socket, 201-06. Low-frequency and low-speed radial force loading ball head, 202. Low-frequency and low-speed loading unit, 202-01. Bearing upper end cover, 202-02 . No. 1 bearing sleeve, 202-03. Bearing lower end cover, 202-04. No. 1 bearing, 202-05. No. 1 gasket, 202-06. No. 1 locking nut, 202-07. No. 1 sleeve, 202-08. Low-frequency and low-speed simulation tool handle, 202-09. No. 2 bearing, 202-10. Bearing retaining ring, 202-11. No. 2 gasket, 202-12. No. 2 locking nut, 202-13. Shaft sleeve, 202-14. No. 1 bevel gear, 202-15. No. 2 bevel gear, 202-16. No. 3 bearing, 203. Low-frequency and low-speed torque loading device, 203-01. Dynamometer, 203-02. Dynamometer base, 204. Low-frequency and low-speed axial force loading device, 204-01. Axial electro-hydraulic servo loader, 204-02. Low-frequency and low-speed axial force loading ball head, 204-03. Low-frequency and low-speed axial force loading ball socket, 204-04. Lever support seat, 204-04-01. Support seat, 204-04-02. No. 4 bearing, 204-04-03. Fixed end cover, 204-04-04. No. 3 gasket, 204-04-05. No. 1 support shaft, 204-04-06. No. 3 locking nut, 204-04-07. No. 2 sleeve, 204-05. Lever, 204-06. Lever pull nail, 204-07. No. 1 loading fork, 3. High-frequency and high-speed electric spindle reliability loading test system, 301. High-frequency and high-speed radial mean force loading device, 301-01.Mean electric cylinder, 301-02. Mean electric cylinder support seat, 301-03. Electric cylinder connecting sleeve, 301-04. Force sensor, 301-05. Loading wire rope, 301-06. No. 1 pull nail, 301-07. No. 2 pull nail, 302. High-frequency and high-speed loading unit, 302-01. No. 2 bearing sleeve, 303. High-frequency and high-speed radial amplitude force loading device, 303-01. Radial amplitude force loading ball socket, 303-02. Loading rod, 303-03. Nut, 303-04. Amplitude vibration table, 303-05. Amplitude sensor, 303-06. High-frequency and high-speed loading unit force ball head, 304. Drag torque loading device, 304-01. Drag electric spindle clamp, 304-02. Drag torque loading electric spindle, 304-03. Coupling, 304-04. High-frequency and high-speed simulated tool holder, 305. High-frequency and high-speed axial force loading device, 305-01. Guide column support seat, 305-02. Axial force sensor, 305-03. Axial force ear, 305-04. Tension nail, 305-05. No. 4 locking nut, 305-06. Wire rope, 305-07. No. 2 Loading fork, 305-08. Push plate, 305-09. Nut, 305-10. Pull rod, 305-11. High-frequency and high-speed axial force loading electric cylinder, 305-12. No. 1 guide column fixing sleeve, 305-13. No. 1 support plate, 305-14. Push plate guide sleeve, 305-15. Push plate guide column, 305-16. Top wheel, 305-17. Steel pin, 4. Reliability test system of electric spindle broaching mechanism, 401. Counterweight block, 402. Broaching mechanism simulated tool holder, 403. Tool holder mounting seat, 403-01. Bearing end cover, 403-02. Seal ring, 403-03. No. 5 bearing, 403-04. No. 3 sleeve, 404. Broaching force dynamometer , 405. Gear mounting seat, 405-01. No. 2 support shaft, 405-02. Large gear locking nut, 405-03. No. 4 gasket, 405-04. Large gear, 405-05. No. 6 bearing, 405-06. Small gear locking nut, 405-07. No. 5 gasket, 405-08. Small gear, 405-09. No. 7 bearing, 406. Top plate, 407. Top plate guide sleeve, 408. Top plate guide column, 409. Reducer motor, 410. Electric cylinder, 411. No. 2 guide column fixing seat, 412. Base, 413. Support plate guide column, 414. No. 2 support plate, 415. Guide column anti-slip sleeve, 416. Tool handle turntable, 5. Level iron. DETAILED DESCRIPTION

[0049] The present invention is described in detail below in conjunction with the accompanying drawings:

[0050] The present invention is a fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability loading test device proposed by simulating the reliability test of the electric spindle under different working conditions and different loads.

[0051] See also Figure 1 The fully automatic, multi-working condition, multi-index comprehensive electric spindle reliability test device described in the present invention includes an electric spindle mobile positioning system 1, a low-frequency and low-speed electric spindle reliability loading test system 2, a high-frequency and high-speed electric spindle reliability loading test system 3, an electric spindle broaching mechanism reliability test system 4 and a ground level iron 5.

[0052] The horizontal iron 5 is installed at the bottom end, the electric spindle movement positioning system 1 is installed on the front and rear sides of the horizontal iron 5, the electric spindle broaching mechanism reliability test system 4 is installed on the leftmost side of the horizontal iron 5, the high-frequency and high-speed electric spindle reliability loading test system 3 is installed on the right side of the spindle broaching mechanism reliability test system 4, and the low-frequency and low-speed electric spindle reliability loading test system 2 is installed on the right side of the high-frequency and high-speed electric spindle reliability loading test system 3; the electric spindle movement positioning system 1, the low-frequency and low-speed electric spindle reliability loading test system 2, the high-frequency and high-speed electric spindle reliability loading test system 3 and the electric spindle broaching mechanism reliability test system 4 are all in contact with the upper surface of the horizontal iron 5 and are fixed by bolts.

[0053] 1. Ground level iron

[0054] The ground iron 5 is a rectangular plate casting, and the top of the ground iron 5 is provided with T-shaped grooves of the same structure and parallel to each other, and the bottom of the ground iron 5 is provided with a weight reduction groove. Two rectangular grooves are provided in the middle of the top of the ground iron 5, which are used to install the axial electro-hydraulic servo loader 204-01 in the low-frequency and low-speed electric spindle reliability loading test system 2 and the drag torque loading device 304 in the high-frequency and high-speed electric spindle reliability loading test system 3.

[0055] 2. Electric spindle mobile positioning system

[0056] See also Figure 2 The electric spindle mobile positioning system 1 of the present invention comprises a No. 1 precision ball screw 101-A, a No. 2 precision ball screw 101-B, an electric spindle simulated tool holder matching device 102 and a mobile gantry 103; wherein: the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B have the same structure;

[0057] See also Figure 2The movable gantry 103 is a large-scale portal structure made by casting. The movable gantry 103 includes a front support, a rear support and an intermediate crossbeam. The top ends of the front support and the rear support and the two ends of the intermediate crossbeam are vertically connected into one. The front support and the rear support have the same structure. Both the front support and the rear support are composed of a main support, a left auxiliary support and a right auxiliary support. The left auxiliary support and the right auxiliary support have the same structure. The left auxiliary support and the right auxiliary support are symmetrically arranged on the left and right sides of the main support. The top ends of the left and right auxiliary supports and the left and right side walls of the lower end of the main support are connected into one; the bottom ends of the front support and the rear support are respectively cast with a group of 3 connecting plates, wherein the connecting plates on the bottom ends of the left and right auxiliary supports have the same structure, and each group of 3 connecting plates are all rectangular plate-type structural members, and 4 groups are evenly arranged on each connecting plate There are 16 bolt holes in total, one group of bolt holes on each connecting plate and the threaded holes on the No. 1 guide slider and the No. 2 guide slider in the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B are aligned and concentric, and the bolts are inserted into the bolt holes on the three connecting plates at the bottom ends of the front and rear pillars of the mobile gantry 103 to fix the mobile gantry 103 on the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B; the front side screw nut seat and the rear side screw nut seat are cast at the bottom center of the connecting plate of the main pillar in the front and rear pillars of the mobile gantry 103, and the front side screw nut seat and the rear side screw nut seat and the No. 1 screw nut and the No. 2 screw nut on the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B are assembled and fixed with screws to realize the transmission of driving force.

[0058] See also Figure 3 The electric spindle simulated tool handle matching device 102 includes a No. 3 precision ball screw 102-A, a No. 4 precision ball screw 102-B, a knife-beating cylinder 102-01, a vertical guide rail mounting plate 102-02, a spindle water jacket 102-03, a spindle clamp 102-04, an electric spindle 102-05 and a joint plate 102-06. Among them: the No. 3 precision ball screw 102-A and the No. 4 precision ball screw 102-B have the same structure.

[0059] The knife-beating cylinder 102-01 is a STJ gas-liquid booster cylinder series knife-beating cylinder produced by Xuntuo Technology Co., Ltd. A thick plate is provided at the lower side of the knife-beating cylinder 102-01, and bolt holes are provided at the four corners of the thick plate. Bolts are inserted into the bolt holes of the thick plate at the lower side of the knife-beating cylinder 102-01 to fix the knife-beating cylinder 102-01 on the top of the electric spindle 102-05. The main function of the knife-beating cylinder 102-01 is to drive the internal mechanism of the electric spindle 102-05 to cooperate with the rivet of the simulated tool handle, thereby realizing the cooperation between the electric spindle 102-05 and the simulated tool handle.

[0060] The spindle clamp 102-04 is a cubic structural member, a through hole is arranged at the geometric center of the cubic structural member, 8 threaded holes of the same structure are evenly arranged on the bottom end surface of the circumference of the through hole of the spindle clamp 102-04, vertical strips are arranged on the right ends of the front and rear sides of the spindle clamp 102-04, and 5 bolt holes with equal spacing are arranged on the vertical strips on both sides, and are concentric with the threaded holes arranged at the lower left side of the vertical guide rail mounting plate 102-02. Bolts are inserted into the bolt holes arranged on the vertical strips on the front and rear sides of the spindle clamp 102-04 to fix the spindle clamp 102-04 at the lower left side of the vertical guide rail mounting plate 102-02.

[0061] The spindle water jacket 102-03 is a hollow cylindrical shell structure, with a circular annular flange at its bottom end, 8 bolt holes are evenly arranged on the outer circumference of the circular annular flange, and are concentric with the threaded holes on the bottom end surface of the through hole circumference of the spindle clamp 102-04, and 14 threaded holes are evenly arranged on the inner circumference of the flange, and the 14 threaded holes are concentric with the bolt holes arranged on the flange of the electric spindle 102-05. The spindle water jacket 102-03 is inserted into the central through hole of the spindle clamp 102-04, the upper surface of the flange at the bottom end of the spindle water jacket 102-03 contacts the bottom end surface of the spindle clamp 102-04, and the bolts are inserted into the bolt holes on the outer circumference of the flange at the bottom end of the spindle water jacket 102-03 to fix the spindle water jacket 102-03 on the spindle clamp 102-04.

[0062] The electric spindle 102-05 is a long axis test piece, and a circular flange is provided at the bottom end thereof, and 14 bolt holes with the same structure are provided on the flange, and the 14 bolt holes with the same structure are concentric with the 14 threaded holes provided on the inner circumference of the flange at the bottom end of the spindle water jacket 102-03, and the upper surface of the flange at the bottom end of the electric spindle 102-05 is in contact with the lower surface of the flange at the bottom end of the spindle water jacket 102-03, and the bolts are inserted into the bolt holes on the flange at the bottom end of the electric spindle 102-05 to fix the electric spindle 102-05 on the spindle water jacket 102-03. A tapered hole is provided at the geometric center of the bottom end of the electric spindle 102-05, and a clamping claw is provided in the tapered hole to cooperate with the installation of the simulated tool handle.

[0063] The vertical guide rail mounting plate 102-02 is composed of a lower square plate, a middle long strip plate and a small flat plate at the top. A threaded hole is arranged on the left end face of the lower square plate and is concentric with the bolt holes on the vertical strip plates on the front and rear sides of the spindle clamp 102-04. Two rows of 24 threaded holes are arranged on the right end face of the middle long strip plate of the vertical guide rail mounting plate 102-02 and are concentric with the bolt holes on the base of the No. 3 precision ball screw 102-A. A square through hole is arranged in the middle of the small flat plate at the top of the vertical guide rail mounting plate 102-02. The motor of the No. 3 precision ball screw 102-A is installed in the square through hole of the small flat plate at the top of the vertical guide rail mounting plate 102-02 and is installed at the top of the vertical guide rail mounting plate 102-02.

[0064] The structures of the No. 3 precision ball screw 102-A and the No. 4 precision ball screw 102-B are exactly the same.

[0065] See also Figure 4 The No. 4 precision ball screw 102-B includes a No. 4 motor 102-B-01, a No. 4 screw mounting seat 102-B-02, 4 No. 4 guide rail sliders 102-B-03 with the same structure, a No. 4 screw nut 102-B-04, a No. 4 screw 102-B-05, 2 No. 4 guide rails 102-B-06 with the same structure, a No. 4 base 102-B-07, a No. 4 grating ruler 102-B-08, a No. 4 grating ruler reading head 102-B-09, a No. 4 reading head connecting plate 102-B-10 and a No. 4 bearing seat 102-B-11;

[0066] The No. 4 base 102-B-07 is a rectangular parallelepiped structural member, in which a groove is arranged in the middle along the longitudinal direction, and 8 bolt holes are evenly arranged at the intersection of the groove wall on the front and rear sides of the groove and the groove bottom plane of the groove, and 4 threaded holes are arranged on the groove bottom at the left end of the groove for fixing and installing the No. 4 screw mounting seat 102-B-02, and a rectangular groove is arranged on the groove bottom at the right end of the groove for installing the No. 4 bearing seat 102-B-11, and the front and rear groove walls of the No. 4 base 102-B-07 are provided with a plurality of bolt holes. The top of the base 102-B-07 is evenly provided with 9 threaded holes along the longitudinal direction for fixing the guide rail No. 4 102-B-06; the bottom plane of the base No. 4 102-B-07 is in contact with the left end surface of the middle beam of the mobile gantry 103, and the bolts are inserted into the bolt holes at the intersection of the front and rear side walls of the groove of the base No. 4 102-B-07 and the bottom plane of the groove to fix the base No. 4 102-B-07, that is, the precision ball screw No. 4 102-B, on the left end surface of the middle beam in the mobile gantry 103.

[0067] The No. 4 motor 102-B-01 is located at the leftmost end of the No. 4 precision ball screw 102-B. The No. 4 motor 102-B-01 adopts a large inertia motor of the Panasonic NAS A4 series model MDMA152P1V, which is the total power source output of the No. 4 precision ball screw 102-B. Four bolt holes are arranged at the four corners of the rectangular plate on the right end of the No. 4 motor 102-B-01 and are aligned and concentric with the four threaded holes arranged on the left end face of the No. 4 screw mounting seat 102-B-02. Bolts are inserted into the four bolt holes arranged at the four corners of the rectangular plate on the right end of the No. 4 motor 102-B-01 to fix the No. 4 motor 102-B-01 on the left end face of the No. 4 screw mounting seat 102-B-02.

[0068] The No. 4 screw mounting seat 102-B-02 is a cast shell structure. The No. 4 screw mounting seat 102-B-02 is provided with a rectangular through hole with rounded corners at the left end of the top, and a weight reduction groove is provided on the right side of the top. A bolt hole is provided on the bottom of the weight reduction groove and is concentric with the threaded hole on the No. 4 base 102-B-07; the No. 4 screw mounting seat 102-B-02 is provided with a cylindrical through hole at the center from the left end face to the right end face, and is concentric with the coupling and bearing installed inside the No. 4 screw mounting seat 102-B-02, and 4 threaded holes are provided on the left end face of the No. 4 screw mounting seat 102-B-02 and are concentric with the bolt holes on the right end face of the No. 4 motor 102-B-01. The bolts are inserted into the bolt holes provided on the bottom surface of the weight-reducing groove of the No. 4 screw mounting seat 102-B-02 to fix the No. 4 screw mounting seat 102-B-02 on the bottom surface of the groove of the No. 4 base 102-B-07. The main function of the No. 4 screw mounting seat 102-B-02 is to support the No. 4 screw 102-B-05 and connect the output shaft of the No. 4 motor 102-B-01 with the No. 4 screw 102-B-05 to realize power transmission.

[0069] The two No. 4 guide rails 102-B-06 with the same structure adopt HGW series linear guide rails, and 9 screw holes are set on the No. 4 guide rail 102-B-06 and are concentric with the 9 threaded holes set on the front and rear sides of the top of the No. 4 base 102-B-07 respectively. The two No. 4 guide rails 102-B-06 with the same structure are fixedly connected to the No. 4 base 102-B-07 with screws and are symmetrically distributed about the No. 4 base 102-B-07 in the longitudinal direction. Four No. 4 guide rail sliders 102-B-03 with model HGH25CA are installed on the two No. 4 guide rails 102-B-06 with the same structure and are symmetrically distributed about the No. 4 base 102-B-07, and each No. 4 guide rail slider 102-B-03 is provided with 2 threaded holes on the left and right sides.

[0070] The No. 4 lead screw 102-B-05 is a SFU04010-4 lead screw, which is located in the longitudinal middle of the No. 4 base 102-B-07 and is provided with a No. 4 lead screw nut 102-B-04, and the left and right sides of the No. 4 lead screw 102-B-05 are supported and fixed by the No. 4 lead screw mounting seat 102-B-02 and the No. 4 bearing seat 102-B-11 respectively. No. 4 precision grating ruler 102-B-08 is installed on the front side wall of No. 4 base 102-B-07. No. 4 grating ruler 102-B-08 adopts SINO's KA-300 grating ruler, which has the advantages of high detection accuracy and fast response speed. No. 4 grating ruler 102-B-08 is a rectangular structural part. A T-slot is provided on the top of No. 4 precision grating ruler 102-B-08 for installing No. 4 grating ruler reading head 102-B-09. Two grooves with the same structure and a common groove bottom are provided on the front and rear sides of the left and right ends of No. 4 grating ruler 102-B-08. Through holes are provided in the horizontal direction on the groove bottom of the two grooves. Screws are inserted into the through holes to fix No. 4 grating ruler 102-B-08 on the front side wall of No. 4 base 102-B-07.

[0071] The No. 4 grating scale reading head 102-B-09 is a rectangular structural part with a T-claw at its lower end. Four threaded holes are symmetrically arranged on the left and right ends of the front side of the No. 4 grating scale reading head 102-B-09. Two No. 4 reading head connecting plates 102-B-10 with the same structure are provided on the outer side of the No. 4 grating scale reading head 102-B-09. They are L-shaped folding plates. Two screw holes are arranged on the lower folding plate of the No. 4 reading head connecting plate 102-B-10 and are concentric with the threaded holes on the left and right ends of the front side of the No. 4 grating scale reading head 102-B-09. Screw holes are also arranged on the upper folding plate and are concentric with the threaded holes on the coupling plate 102-06.

[0072] The No. 4 grating ruler reading head 102-B-09 is assembled with the T-slot on the top of the No. 4 precision grating ruler 102-B-08 through its T-claw to realize the sliding of the No. 4 grating ruler reading head 102-B-09 in the left and right directions of the No. 4 precision grating ruler 102-B-08. The screws are inserted into the through holes on the lower folding plate of the No. 4 reading head connecting plate 102-B-10 to fix the No. 4 reading head connecting plate 102-B-10 to the front side of the No. 4 grating ruler reading head 102-B-09. Similarly, the screws are inserted into the through holes on the upper folding plate of the No. 4 reading head connecting plate 102-B-10 to connect and fix the No. 4 reading head connecting plate 102-B-10 to the joint plate 102-06.

[0073] See also Figure 3The said joint plate 102-06 is a cast flat plate structure, which is composed of two front and rear nut seats and an intermediate plate. Four groups of 16 bolt holes are symmetrically arranged on the left and right sides of the intermediate plate, and are respectively concentric with the threaded holes on the guide rail sliders of the No. 4 precision ball screw 102-B and the No. 3 precision ball screw 102-A. The joint plate 102-06 is provided with two groups of 4 threaded holes above the right side and the rear side of the left side of the intermediate plate, and are respectively concentric with the screw holes on the reading head connecting plate of the No. 4 precision ball screw 102-B and the No. 3 precision ball screw 102-A. The two screw nut seats arranged on the front and rear sides of the joint plate 102-06 are respectively matched with the circular surfaces of the screw nuts on the No. 4 precision ball screw 102-B and the No. 3 precision ball screw 102-A, and are locked and fixed by screw connection, thereby realizing power transmission. Bolts are inserted into the bolt holes on the coupling plate 102-06 to tightly fix the coupling plate 102-06 between the No. 3 precision ball screw 102-A and the No. 4 precision ball screw 102-B and realize the close interconnection between the No. 3 precision ball screw 102-A, the coupling plate 102-06 and the No. 4 precision ball screw 102-B.

[0074] When the No. 4 motor 102-B-01 of the No. 4 precision ball screw 102-B is driven, the No. 4 screw 102-B-05 drives the No. 4 screw nut 102-B-04 to move left and right, the No. 4 screw nut 102-B-04 drives the connecting plate 102-06 to move left and right, the connecting plate 102-06 drives the No. 3 precision ball screw 102-A to move left and right, the No. 3 precision ball screw 102-A drives the vertical guide rail mounting plate 102-02 to move left and right, the vertical guide rail mounting plate 102-02 drives the electric spindle 102-05 to move left and right, after layers of power transmission, in conjunction with the No. 4 grating ruler 102-B-08 and the background computer control system, the precise movement control of the electric spindle 102-05 in the left and right directions can be achieved by precisely controlling the No. 4 precision ball screw 102-B. Similarly, by controlling the No. 3 precision ball screw 102-A, precise movement control of the electric spindle 102-05 in the up and down directions can be achieved.

[0075] See also Figure 2 and Figure 3The structural difference between the No. 1 precision ball screw 101-A, No. 2 precision ball screw 101-B and the No. 3 precision ball screw 102-A, No. 4 precision ball screw 102-B is that the guide rails and bases of the No. 1 precision ball screw 101-A and No. 2 precision ball screw 101-B are longer than the guide rails and bases of the No. 3 precision ball screw 102-A and No. 4 precision ball screw 102-B, and there are 12 guide rail sliders installed on the No. 1 precision ball screw 101-A and No. 2 precision ball screw 101-B, while there are only 4 guide rail sliders installed on the No. 3 precision ball screw 102-A and No. 4 precision ball screw 102-B. Three grating scales are distributed at a certain interval on the outside of precision ball screw No. 1 101-A and precision ball screw No. 2 101-B, and the positions of the grating scales are aligned with the positions of the simulated tool handles in the low-frequency and low-speed electric spindle reliability loading test system 2, the high-frequency and high-speed electric spindle reliability loading test system 3 and the electric spindle broaching mechanism reliability test system 4 respectively; the precision ball screw No. 1 101-A and the precision ball screw No. 2 101-B are installed in parallel and symmetrically at the bottom ends of the front and rear pillars in the mobile gantry 103, and the precision ball screw No. 1 101-A and the precision ball screw No. 2 101-B are installed symmetrically on the upper surface of the horizontal iron 5 along the longitudinal direction and are fixed to the horizontal iron 5 with T-shaped bolts.

[0076] When the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B are driven, after layers of power transmission, the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B transmit power to the main pillars of the front and rear pillars of the mobile gantry 103, thereby driving the entire mobile gantry 103 to move left and right, thereby realizing the movement of the electric spindle mobile positioning system 1 in the left and right directions, so when the electric spindle mobile positioning system 1 drives the electric spindle 102-05 to move and the low frequency and low speed When the electric spindle reliability loading test system 2 and the high-frequency and high-speed electric spindle reliability loading test system 3 are matched with the simulated tool holder in the electric spindle broaching mechanism reliability test system 4, the grating ruler reader can accurately record the distance that the mobile gantry 103 drives the electric spindle 102-05 to move in the left and right directions. Through the control of the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 102-B by the background computer control system, the electric spindle 102-05 can be precisely moved and controlled in the left and right directions. Combined with the control of the No. 3 precision ball screw 102-A and the No. 4 precision ball screw 102-B, the electric spindle 102-05 can be precisely moved and controlled in all degrees of freedom in the up, down, left, right, front and back directions under the drive of the electric spindle mobile positioning system 1.

[0077] To summarize, the horizontal iron 5 is installed at the bottom, the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B in the electric spindle mobile positioning system 1 are symmetrically installed on the front and rear upper surfaces of the horizontal iron 5 and fixed by bolts, the mobile gantry 103 spans the horizontal iron 5 and is installed on the upper surfaces of the No. 1 precision ball screw 101-A and the No. 2 precision ball screw 101-B by bolts, and the electric spindle simulation tool holder matching device 102 is installed on the middle left plane of the middle beam of the mobile gantry 103 and fixed on the middle beam of the mobile gantry 102 by bolts.

[0078] When conducting the reliability loading test of the electric spindle, the electric spindle 102-05 can realize precise movement in the left and right directions driven by the precision ball screw No. 1 101-A and the precision ball screw No. 2 102-B, can realize precise movement in the up and down directions driven by the precision ball screw No. 3 102-A, and can realize precise movement in the front and back directions driven by the precision ball screw No. 4 102-B. Therefore, the electric spindle 102-05 can be driven by the entire electric spindle movement and positioning system 1 to realize full-degree-of-freedom movement and positioning. The adjustment process of the electric spindle 102-05 is automatically completed by the computer control system throughout the process, and can achieve precise coordination with the simulated tool holder in the low-frequency and low-speed electric spindle reliability loading test system 2, the high-frequency and high-speed electric spindle reliability loading test system 3, and the electric spindle broaching mechanism reliability test system 4. This greatly improves the test accuracy and test efficiency of the electric spindle reliability test, and solves the problem of huge time and manpower consumption in the test preparation process of manually adjusting the test bench such as centering and tool changing.

[0079] 3. Low frequency and low speed electric spindle reliability loading test system

[0080] See also Figure 5 The low-frequency and low-speed electric spindle reliability loading test system 2 of the present invention comprises a low-frequency and low-speed radial force loading device 201, a low-frequency and low-speed loading unit 202, a low-frequency and low-speed torque loading device 203 and a low-frequency and low-speed axial force loading device 204. The low-frequency and low-speed radial force loading device 201, the low-frequency and low-speed torque loading device 203 and the low-frequency and low-speed axial force loading device 204 are all fixedly connected to the ground level iron 5 by bolts.

[0081] See also Figure 6 The low-frequency and low-speed radial force loading device 201 of the low-frequency and low-speed electric spindle reliability loading test system 2 includes a radial electro-hydraulic servo loader 201-01, an intermediate force plate 201-02, two brackets 201-03 with the same structure, a support plate 201-04, a low-frequency and low-speed radial force loading ball socket 201-05 and a low-frequency and low-speed radial force loading ball head 201-06.

[0082] The support plate 201-04 is composed of a rectangular flat plate and two rectangular convex plates with the same structure, i.e., mounting seats. The two rectangular convex plates with the same structure, i.e., mounting seats, are symmetrically fixed on the rectangular flat plate at the left and right ends. Open T-shaped grooves are provided at the front and rear ends of the convex plates. Bolts are installed in the T-shaped grooves. The mounting seats are used to fix and connect the mounting bracket 201-03. A total of 6 long strip through holes are evenly and symmetrically provided on the rectangular flat plates at the front, rear, left and right sides of the two mounting seats with the same structure. Bolts are inserted into the long strip through holes of the rectangular flat plates to tightly fix the support plate 201-04 on the ground level iron 5.

[0083] The two brackets 201-03 with the same structure are located between the support plate 201-04 and the middle force plate 201-02. The bracket 201-03 is composed of a rectangular bottom plate, front and rear reinforcing ribs, rectangular front and rear vertical plates, a rectangular middle plate and an upper circular plate.

[0084] The four corners of the rectangular bottom plate in the bracket 201-03 are rounded, and rectangular weight-reducing through holes with rounded corners are arranged on the left and right sides in the middle of the bottom plate of the bracket 201-03. Bolt through holes are arranged at the front and rear corners of the bottom plate of the bracket 201-03. Rectangular vertical plates with the same structure are arranged on the front and rear sides of the top surface of the bottom plate of the bracket 201-03. A rectangular middle plate perpendicular to the two front and rear vertical plates is arranged between the two rectangular front and rear vertical plates to connect them and connect them vertically with the bottom plate as a whole. The two rectangular front and rear vertical plates are also connected to the bottom plate through two front and rear reinforcing ribs. Long strip weight-reducing holes are arranged on the left and right sides of the two rectangular front and rear vertical plates, and a circular plate is arranged above the two rectangular front and rear vertical plates. The circular plate is provided with 4 threaded holes and is concentric with the through holes on the middle force plate 201-02. The bolts are inserted into the bolt holes at the front and rear corners of the bottom plate of the bracket 201-03 and connected with the bolt mounting seats in the T-slots of the convex plate above the support plate 201-04, so that the bracket 201-03 is tightly fixed to the top of the support plate 201-04.

[0085] The intermediate force plate 201-02 is a rectangular flat plate with rounded corners, and has through holes on both sides of the plate that contacts the bracket 201-03 and is concentric with the threaded holes of the top circular plate of the bracket 201-03. The bottom end surface of the intermediate force plate 201-02 contacts the circular flat plates on the top of the two brackets 201-03 with the same structure.

[0086] The radial electro-hydraulic servo loader 201-01 comprises a servo loading cylinder, a telescopic shaft, a protective cover, a transition push plate and a force sensor. The protective cover of the radial electro-hydraulic servo loader 201-01 is a rectangular shell member without a top wall and a right side wall, and its bottom wall is in contact with the intermediate force plate 201-02. A bolt through hole is provided on the bottom wall of the protective cover and is concentric with the through hole of the intermediate force plate 201-02. Located inside the protective cover is the servo loading cylinder of the radial electro-hydraulic servo loader 201-01, which has the advantages of good control performance and accurate loading. Located on the right side of the servo loading cylinder of the radial electro-hydraulic servo loader 201-01 is the telescopic shaft of the radial electro-hydraulic servo loader 201-01, and a threaded hole is provided at the right end of the telescopic shaft. The telescopic shaft is controlled to telescope back and forth by the servo loading cylinder; located on the right side of the telescopic shaft of the radial electro-hydraulic servo loader 201-01 is the transition push plate, and the transition push plate consists of two long left and right parts. The bolt is inserted into the bolt hole set in the middle of the right surface of the left push plate to fix the left push plate of the transition push plate to the right surface of the telescopic shaft. Threaded holes are set on the right surface of the left push plate of the transition push plate and the front and rear sides of the left surface of the right push plate. The middle connecting column of the transition push plate is composed of an intermediate optical axis and left and right short screws. The left and right short screws of the middle connecting column of the transition push plate are respectively connected with the threaded holes set on the front and rear sides of the left and right push plates of the transition push plate, and the left and right push plates of the transition push plate are tightly connected. A screw hole is set in the middle position of the left surface of the right push plate of the transition push plate and is concentric with the threaded hole of the geometric center of the left surface of the force sensor adjacent to it. The screw is inserted into the screw hole set in the middle position of the left surface of the right push plate of the transition push plate to fix the force sensor to the right surface of the right push plate of the transition push plate. The force sensor of the radial electro-hydraulic servo loader 201-01 has the shape of a short cylinder, and threaded holes are arranged in the center of the left and right sides of the force sensor. The threaded holes on the right surface are used to install and connect the low-frequency and low-speed radial force loading ball socket 201-05; the radial electro-hydraulic servo loader 201-01 is installed on the upper surface of the intermediate force plate 201-02, and the bolts are inserted into the bolt holes of the bottom plate of the radial electro-hydraulic servo loader 201-01 and pass through the bolt holes of the intermediate force plate 201-02 to cooperate with the threaded holes of the top circular plate of the bracket 201-03, so that the radial electro-hydraulic servo loader 201-01, the intermediate force plate 201-02 and the bracket 201-03 are tightly connected together.

[0087] The low-frequency, low-speed radial force loading ball socket 201-05 is composed of a short screw and a small cube. The screw is screwed into the threaded hole opened in the center of the right side surface of the force sensor of the radial electro-hydraulic servo loader 201-01 to tightly fix the low-frequency, low-speed radial force loading ball socket 201-05 on the radial electro-hydraulic servo loader 201-01. The small cube on the right side of the low-frequency, low-speed radial force loading ball socket 201-05 is provided with a spherical groove on the side in contact with the low-frequency, low-speed radial force loading ball head 201-06. The low-frequency, low-speed radial force loading ball head 201-06 is also composed of a short screw and a semicircular ball head. The semicircular ball head of the low-frequency, low-speed radial force loading ball head 201-06 is concentric with the spherical groove of the low-frequency, low-speed radial force loading ball socket 201-05 and has the same radius. The screw part is screwed into the threaded hole of the loading unit 202 to be connected and fixed.

[0088] When conducting a reliability loading test of a low-frequency and low-speed electric spindle, the radial electro-hydraulic servo loader 201-01 drives the telescopic shaft and drives the low-frequency and low-speed radial force loading ball socket 201-05 to slowly approach the low-frequency and low-speed radial force loading ball head 201-06. When the spherical groove of the low-frequency and low-speed radial force loading ball socket 201-05 contacts the semicircular ball head of the low-frequency and low-speed radial force loading ball head 201-06, the low-frequency and low-speed radial force loading ball socket 201-05 pushes the low-frequency and low-speed radial force loading ball head 201-06 and applies force, and the low-frequency and low-speed radial force loading ball head 201-06 transmits the force to the low-frequency and low-speed loading unit 202, thereby realizing radial force simulation loading of the low-frequency and low-speed loading unit 202. The force sensor on the radial electro-hydraulic servo loader 201-01 feeds back the magnitude of the force to the background control system, and the accurate radial force loading of the low-frequency and low-speed loading unit 202 can be realized through the control of the background control system.

[0089] See also Figure 7 The low-frequency and low-speed loading unit 202 of the low-frequency and low-speed electric spindle reliability loading test system described in the present invention includes a bearing upper end cover 202-01, a No. 1 bearing sleeve 202-02, a bearing lower end cover 202-03, a No. 1 bearing 202-04, a No. 1 gasket 202-05, a No. 1 locking nut 202-06, a No. 1 sleeve 202-07, a low-frequency and low-speed simulated tool holder 202-08, two No. 2 bearings 202-09 with the same structure, a bearing retaining ring 202-10, a No. 2 gasket 202-11, a No. 2 locking nut 202-12, a sleeve 202-13, a No. 1 bevel gear 202-14, a No. 2 bevel gear 202-15 and a No. 3 bearing 202-16.

[0090] Among them: No. 1 bearing 202-04, No. 1 gasket 202-05, No. 1 locking nut 202-06, No. 2 bearing 202-09, bearing retaining ring 202-10, No. 2 gasket 202-11, No. 2 locking nut 202-12 and No. 3 bearing 202-16 are all standard parts.

[0091] The low-frequency and low-speed simulation tool handle 202-08 is a non-standard customized BT40 series CNC tool handle, which consists of a stepped shaft at the lower end, an intermediate conical tool handle head and a top rivet. The top of the intermediate conical tool handle head of the low-frequency and low-speed simulation tool handle 202-08 is provided with a threaded hole and is threadedly connected to the top rivet to fix the rivet to the top of the intermediate conical tool handle head. The low-frequency and low-speed simulation tool handle 202-08 is installed inside the low-frequency and low-speed loading unit 202 and is locked and fixed by other structural parts of the low-frequency and low-speed loading unit 202. When the electric spindle 102-05 cooperates with the low-frequency and low-speed simulated tool handle 202-08, the claws inside the tapered hole of the electric spindle 102-05 open and tightly grasp the top pull nail of the low-frequency and low-speed simulated tool handle 202-08 under the action of the tool-beating cylinder 102-01, and the tapered hole at the lower end of the electric spindle 102-05 cooperates with the middle tapered tool handle head of the low-frequency and low-speed simulated tool handle 202-08, thereby realizing the cooperation between the electric spindle 102-05 and the low-frequency and low-speed simulated tool handle 202-08.

[0092] The No. 1 bearing sleeve 202-02 is a hollow cube-shaped structural member. The No. 1 bearing sleeve 202-02 is provided with threaded holes on the left and right side walls that cooperate with the lever pull nail 204-06, and a threaded hole on the rear side wall that cooperates with the low-frequency and low-speed radial force loading ball head 201-06. Four threaded holes are provided at the four corners of the upper and lower end faces and are concentrically aligned with the bolt holes on the bearing upper end cover 202-01 and the bearing lower end cover 202-03 respectively. Two No. 2 bearings 202-09 with the same structure and a bearing retaining ring 202-10 are installed inside the No. 1 bearing sleeve 202-02. The two No. 2 bearings 202-09 with the same structure are located at the upper and lower ends of the No. 1 bearing sleeve 202-02 and are separated by the bearing retaining ring 202-10. The upper No. 2 bearing 202-09 is positioned by the shoulder of the low-frequency and low-speed simulated tool handle 202-08, and the lower bearing is positioned and locked by the gasket 202-11 and the locking nut 202-12.

[0093] The bearing upper end cover 202-01 and the bearing lower end cover 202-03 have the same structure. They are both square plates with chamfers and screw holes at the four corners. The screw holes at the four corners of the bearing upper end cover 202-01 and the bearing lower end cover 202-03 are respectively aligned and concentric with the threaded holes at the four corners of the upper and lower end faces of the No. 1 bearing sleeve 202-02. The screws are inserted into the screw holes at the four corners of the bearing upper end cover 202-01 and the bearing lower end cover 202-03 to fix the bearing upper end cover 202-01 and the bearing lower end cover 202-03 on the No. 1 bearing sleeve 202-02.

[0094] The structure of the lower end of the low-frequency and low-speed loading unit 202 is mainly composed of a gear transmission pair consisting of a No. 1 bevel gear 202-14 and a No. 2 bevel gear 202-15. The main function of this part is to transmit the torque from the dynamometer 203-01, thereby simulating the simulated torque loading of the low-frequency and low-speed simulation handle 202-08 under real working conditions. The No. 1 bearing 202-04 is located below the lower end cover 202-03 of the bearing and contacts the shoulder of the low-frequency and low-speed simulation handle 202-08, and is isolated from the No. 1 bevel gear 202-14 by the sleeve 202-13. The No. 1 bevel gear 202-14 is positioned and locked by the No. 1 locking nut 202-06 below it and transmits torque to the low-frequency and low-speed simulation handle 202-08 through a key connection. Similarly, bearing No. 3 202-16 is positioned in contact with the shoulder of the drive shaft of the dynamometer 203-01 and is separated from bevel gear No. 2 202-15 by sleeve No. 1 202-07. Bevel gear No. 2 202-15 transmits torque from the drive shaft of the dynamometer 203-01 through a key connection.

[0095] See also Figure 5 and Figure 6 The low-frequency and low-speed torque loading device 203 of the low-frequency and low-speed electric spindle reliability loading test system is mainly composed of a dynamometer 203-01 and a dynamometer base 203-02.

[0096] The bottom of the dynamometer base 203-02 is a rectangular base plate, with 6 long through holes arranged along its two longitudinal sides. A rectangular shell is installed on the top of the base plate in the middle along its longitudinal direction. Four reinforcing ribs are arranged on both longitudinal sides of the shell to connect with the base plate. The bottom of the dynamometer base 203-02 is connected to the ground iron 5 through the base plate. Bolts are inserted into the long through holes on the bottom plate of the dynamometer base 203-02 to firmly fix the dynamometer base 203-02 on the ground iron 5.

[0097] The dynamometer 203-01 adopts an electric dynamometer of model DJ4000-XN-DL22, which has a bearing seat unit for self-protection, so it has the advantages of high reliability and safety. The dynamometer 203-01 is installed on the top of the dynamometer base 203-02, and the surface of the left end and the middle is a rectangular protective cover. The protective cover is a U-shaped shell, and long strips are arranged on both sides of the longitudinal direction of the U-shaped shell protective cover. The long strips on both sides are provided with 4 long strip through holes. Bolts are inserted into the long strip through holes to firmly fix the dynamometer 203-01 on the dynamometer base 203-02. The dynamometer engine is located on the right side of the dynamometer 203-01, which has a precise torque sensor and a torque loading device inside, and can output precise torque under the control of the background control system. The transmission shaft of the dynamometer 203 - 01 is located on a side close to the low-frequency and low-speed loading unit 202 , and is key-connected with the No. 2 bevel gear 202 - 15 on the low-frequency and low-speed loading unit 202 to transmit torque.

[0098] When conducting a reliability loading test of a low-frequency and low-speed electric spindle, the dynamometer 203-01 is started to drive the transmission shaft to rotate. Under the control of the background control system, the dynamometer 203-01 transmits precise torque to the No. 2 bevel gear 202-15 through the transmission shaft and then applies it to the low-frequency and low-speed loading unit 202, thereby achieving precise torque loading of the low-frequency and low-speed loading unit 202.

[0099] See also Figure 6 and Figure 8 The low-frequency and low-speed axial force loading device 204 of the low-frequency and low-speed electric spindle reliability loading test system includes an axial electro-hydraulic servo loader 204-01, a low-frequency and low-speed axial force loading ball head 204-02, a low-frequency and low-speed axial force loading ball socket 204-03, a lever support seat 204-04, a lever 204-05, a lever pull nail 204-06 and a No. 1 loading fork 204-07.

[0100] The structure of the axial electro-hydraulic servo loader 204-01 is similar to that of the radial electro-hydraulic servo loader 201-01, the only difference being that the force sensor of the axial electro-hydraulic servo loader 204-01 is mounted on the lower surface of the upper push plate of the transition push plate of the radial electro-hydraulic servo loader 201-01 and fixed by screw connection. The axial electro-hydraulic servo loader 204-01 is vertically mounted in a rectangular parallelepiped groove dug in the middle of the ground iron 5, the bottom outer surface of the protective cover of the axial electro-hydraulic servo loader 204-01 is in contact with the inner surface of the groove wall of the ground iron 5, and the bolts pass through the bolt holes of the protective cover of the axial electro-hydraulic servo loader 204-01 to tightly fix the axial electro-hydraulic servo loader 204-01 on the ground iron 5. The low-frequency and low-speed axial force loading ball head 204-02 is fixed to the rightmost end of the lever 204-05 by threaded connection, and is concentric with the spherical groove of the low-frequency and low-speed axial force loading ball socket 204-03 fixed to the top of the axial electro-hydraulic servo loader 204-01.

[0101] See also Figure 8 The lever support seat 204-04 is located in the middle of the lever 204-05. The main function of this part is to provide a fulcrum for the support lever. The lever support seat 204-04 includes a support seat 204-04-01, two No. 4 bearings 204-04-02 with the same structure, a fixed end cover 204-04-03, a No. 3 gasket 204-04-04, a No. 1 support shaft 204-04-05, a No. 3 locking nut 204-04-06 and two No. 2 sleeves 204-04-07 with the same structure. Among them, the No. 4 bearing 204-04-02 and the No. 3 locking nut 204-04-06 are standard parts.

[0102] The No. 1 support shaft 204-04-05 is a smooth cylindrical shaft, and the lever 204-05 is a rectangular parallelepiped steel plate. Threaded holes are respectively arranged on the front and rear sides of the leftmost end of the lever 204-05 for connecting the No. 1 loading fork 204-07. A threaded hole is arranged on the upper surface of the rightmost end of the lever 204-05 for connecting the low-frequency and low-speed axial force loading ball head 204-02. A circular through hole is arranged in the middle of the lever 204-05 and is mounted in the middle of the No. 1 support shaft 204-04-05. The lever 204-05 The No. 2 sleeve 204-04-07 and No. 4 bearing 204-04-02 with the same structure are symmetrically distributed on both sides. The No. 4 bearing 204-04-02 on the left side is positioned and clamped by the groove shoulder on the support seat 204-04-01, and the bearing on the right side is positioned and locked by the No. 3 locking nut 204-04-06. The inner end face of the fixed end cover 204-04-03 is in contact and connected with the right end face of the No. 1 support shaft 204-04-05 and is fixed to the support seat 204-04-01 with screws.

[0103] See also Figure 6 The No. 1 loading fork 204-07 is installed at the leftmost end of the lever 204-05, and its structure is a U-shaped fork-like structural member. The front and rear fork arms are both provided with through holes. The lever rivet 204-06 is inserted into the front and rear through holes of the No. 1 loading fork 204-07 to fix the No. 1 loading fork 204-07 on the No. 1 bearing sleeve 202-02 of the loading unit 202. At the right end of the No. 1 loading fork 204-07, two small rectangular plates are provided, which are equal in thickness to the lever 204-05 and symmetrically distributed about the lever 204-05. Each small rectangular plate is provided with two threaded holes. The lever 204-05 is inserted between the two small rectangular plates, and the screws pass through the through holes on the small rectangular plates to connect and fix the No. 1 loading fork 204-07 to the lever 204-05.

[0104] When conducting a reliability loading test of a low-frequency and low-speed electric spindle, the radial electro-hydraulic servo loader 204-01 in the low-frequency and low-speed axial force loading device 204 drives the low-frequency and low-speed axial force loading ball socket 204-03 to move downward, and when the spherical groove of the low-frequency and low-speed axial force loading ball socket 204-03 contacts the low-frequency and low-speed axial force loading ball head 204-02, the low-frequency and low-speed axial force loading ball head 204-02 receives the pressure from the low-frequency and low-speed axial force loading ball socket 204-03 and transmits the pressure to the lever 204-05. Rod 204-05 applies an upward force to No. 1 loading fork 204-07 by lever support seat 204-04 using the lever principle. No. 1 loading fork 204-07 transmits the force to lever rivet 204-06, and lever rivet 204-06 transmits the force to low-frequency and low-speed loading unit 202. Therefore, axial force loading of low-frequency and low-speed loading unit 202 can be simulated. Accurate axial force simulation loading of low-frequency and low-speed loading unit 202 can be achieved through precise control of axial electro-hydraulic servo loader 204-01.

[0105] In summary, see Figure 5 The low-frequency and low-speed radial force loading device 201 is installed on the front side, and drives the low-frequency and low-speed radial force loading ball socket 201-05 to apply radial force to the low-frequency and low-speed loading unit 202 installed in the middle by driving the radial force electro-hydraulic servo loader 201-01; the low-frequency and low-speed axial force loading device 204 is installed on the rear side and applies axial force to the low-frequency and low-speed loading unit 202 through the No. 1 loading fork 204-07; the low-frequency and low-speed torque loading device 203 is installed on the right side of the low-frequency and low-speed loading unit 202 and applies torque to the low-frequency and low-speed loading unit 202 through a bevel gear connection.

[0106] When conducting a reliability loading test of a low-frequency, low-speed electric spindle, the low-frequency, low-speed radial force loading device 201 utilizes a radial electro-hydraulic servo loader 201-01 to drive a low-frequency, low-speed radial force loading ball socket 201-05 to act on a low-frequency, low-speed radial force loading ball head 201-06 to realize radial force loading on a low-frequency, low-speed loading unit 202. The low-frequency, low-speed torque loading device 203 realizes torque loading on the low-frequency, low-speed loading unit 202 through torque transmission via a dynamometer 203-01 and a gear transmission. The low-frequency, low-speed axial force loading device 204 drives a low-frequency, low-speed axial force loading ball socket 204-03 to act on a low-frequency, low-speed axial force on a lever 204-05 through an axial electro-hydraulic servo loader 204-01. On the loading ball head 204-02, the lever 204-05 utilizes the lever action principle to transmit force to the low-frequency and low-speed loading unit 202, thereby realizing radial force loading of the low-frequency and low-speed loading unit 202. Under the combined action of the low-frequency and low-speed radial force loading device 201, the low-frequency and low-speed torque loading device 203, and the low-frequency and low-speed axial force loading device 204, the comprehensive simulated loading of the low-frequency and low-speed loading unit 202 can be realized, thereby simulating the comprehensive simulated loading of the electric spindle 102-05 under various working conditions. Because the loading frequency, electric spindle speed and torque loading speed of this experimental device are all lower than those of the high-frequency and high-speed electric spindle reliability loading test system 3, it is also called a low-frequency and low-speed electric spindle reliability loading test system.

[0107] 4. High-frequency and high-speed electric spindle reliability loading test system

[0108] See also Fig. 9 The high-frequency and high-speed electric spindle reliability loading test system 3 of the present invention comprises a high-frequency and high-speed radial mean force loading device 301, a high-frequency and high-speed loading unit 302, a high-frequency and high-speed radial amplitude force loading device 303, a drag torque loading device 304 and a high-frequency and high-speed axial force loading device 305. The high-frequency and high-speed radial mean force loading device 301, the high-frequency and high-speed radial amplitude force loading device 303 and the drag torque loading device 304 are all connected and fixed to the ground level iron 5 by bolts.

[0109] See also Fig.10 The high-frequency and high-speed radial mean force loading device 301 of the high-frequency and high-speed electric spindle reliability loading test system 3 described in the present invention includes a mean electric cylinder 301-01, a mean electric cylinder support seat 301-02, an electric cylinder connecting sleeve 301-03, a force sensor 301-04, a loading wire rope 301-05, No. 1 rivet 301-06 and No. 2 rivet 301-07; wherein: No. 1 rivet 301-06 and No. 2 rivet 301-07 have exactly the same structure.

[0110] The mean electric cylinder support seat 301-02 is an L-shaped plate-like structural member, including a support wall, a base, a support plate and a reinforcing rib plate; the support wall, the base and the support plate are all rectangular plate-like structural members, the upper end of the support wall is evenly distributed with threaded holes for installing the mean electric cylinder 301-01, and a through hole for installing the telescopic shaft of the mean electric cylinder 301-01 is provided at the center of the threaded hole, the telescopic shaft of the mean electric cylinder 301-01 is concentrically aligned with the through hole, and two long strip through holes are provided on the base, and the support wall and The width of the base is equal, the bottom end of the supporting wall is vertically connected to the right end of the base, the supporting plate is located in the middle of the supporting wall, the supporting plate is parallel to the base, the right end of the supporting plate is fixedly connected to the left wall of the supporting wall, the right-angled triangle reinforcing rib is located below the supporting plate, and the two right-angled sides of the reinforcing rib and the bottom surface of the supporting plate are fixedly connected to the left wall of the supporting wall; bolts are inserted into the two long strip through holes to fix the mean electric cylinder support seat 301-02 on the horizontal iron 5;

[0111] The mean electric cylinder 301-01 adopts the CL065 series servo electric cylinder, which has the advantages of high precision, large thrust, smooth operation and durability. The mean electric cylinder 301-01 includes a transmission device part at the top and a servo motor device at the bottom; a bolt hole is provided at the right end of the transmission device above the mean electric cylinder 301-01 and is concentrically aligned with the threaded hole provided at the upper end of the support wall of the support seat 301-02, and the servo motor at the lower side is in contact with the upper surface of the support plate on the support seat 301-02; a bolt is inserted into the bolt hole provided at the right end of the transmission device above the mean electric cylinder 301-01 to fix the mean electric cylinder 301-01 on the left wall surface of the right support wall of the mean electric cylinder support seat 301-02.

[0112] The left end of the electric cylinder connecting sleeve 301-03 is a cylinder with a diamond-shaped cross-section, and a threaded hole is arranged at the center of the left end face, and the threaded hole is concentric with the telescopic shaft of the transmission device above the mean electric cylinder 301-01. The right end of the electric cylinder connecting sleeve 301-03 is provided with a short screw, and is concentric with the threaded hole on the left end face of the force sensor 301-04. The right end of the telescopic shaft of the transmission device above the mean electric cylinder 301-01 is provided with a thread, which is inserted into the through hole at the upper end of the support wall of the mean electric cylinder support seat 301-02 and then matched with the threaded hole arranged at the left end of the electric cylinder connecting sleeve 301-03. The short screw arranged at the right end of the electric cylinder connecting sleeve 301-03 is matched with the threaded hole at the left end of the force sensor 301-04.

[0113] The force sensor 301-04 adopts a sensor with model CZ-CW11-5KN. The force sensor 301-04 is a small rectangular structural member, and threaded holes are arranged at the geometric centers of the left and right end faces. The right end of the No. 1 rivet 301-06 is a short screw and the left end is a small cube. The small cube is provided with through holes in the upper and lower directions. The threaded hole at the right end of the force sensor 301-04 and the short screw at the left end of the No. 2 rivet 301-07 are fixed by threaded connection; the two ends of the loading wire rope 301-05 are respectively inserted into the central through holes of the No. 1 rivet and the No. 2 rivet and extended out and fixedly connected to form a wire rope closed loop.

[0114] When conducting a reliability loading test of a high-frequency and high-speed electric spindle, the mean electric cylinder 301-01 drives the telescopic shaft to pull along the axial direction of the wire rope, the wire rope is tightened and transmits the force to the high-frequency and high-speed loading unit 302, and the force sensor 301-04 feeds back the loading force to the background computer control system and the computer accurately controls the magnitude of the force applied by the mean electric cylinder 301-01, thereby achieving accurate loading of the simulated mean radial force of the high-frequency and high-speed loading unit 302.

[0115] See also Fig.11 The high-frequency and high-speed loading unit 302 of the high-frequency and high-speed electric spindle reliability loading test system 3 described in the present invention is exactly the same as the structure of the No. 1 bevel gear 202-14 and above of the low-frequency and low-speed loading unit 202 of the low-frequency and low-speed electric spindle reliability loading test system 2. The slight difference is that the No. 2 bearing sleeve 302-01 of the high-frequency and high-speed loading unit 302 is additionally provided with grooves on the front and rear sides, and threaded holes are provided on the upper and lower sides of the grooves. Its main purpose is to cooperate and connect with the axial force ear 305-03 of the high-frequency and high-speed loading unit 302 of the high-frequency and high-speed electric spindle reliability loading test system 3.

[0116] See also Fig.12 The radial amplitude force loading device 303 includes a radial amplitude force loading socket 303-01, a loading rod 303-02, a nut 303-03, an amplitude vibration table 303-04 and an amplitude sensor 303-05; wherein the nut 303-03 is a standard part.

[0117] The amplitude vibration table 303-04 uses the ES-2-150 electric vibration test system produced by Suzhou Dongling Vibration Test Instrument Co., Ltd., with a maximum load of 70kg and a loading frequency of 4000Hz. The amplitude vibration table 303-04 includes a base, a vibration device and a support column;

[0118] The base of the amplitude vibration table 303-04 is composed of a square bottom plate and two identical front and rear side walls. The square bottom plate of the base is vertically connected to the front and rear side walls. The lower surface of the cube bottom plate of the base contacts the upper surface of the ground iron and a long strip through hole is set on the right side of the square bottom plate. Bolts are inserted into the long strip through holes to fix the base of the amplitude vibration table 303-04 on the upper surface of the ground iron 5. The upper sides of the front and rear side walls of the base are chamfered, and the front and rear side walls are provided with circular through holes of the same height and concentricity, and 4 threaded holes are evenly arranged around the through holes.

[0119] The vibration device of the amplitude vibration table 303-04 is a cylindrical shell structure. A threaded hole is arranged on the left end face of the vibration device and is concentrically aligned with the bolt hole of the amplitude sensor 303-05. A through hole with the same radius as the support column is arranged in the middle of the front and rear ends of the cylindrical shell. A transition conical surface is arranged at the right end of the cylindrical shell of the vibration device of the amplitude vibration table 303-04, and a circular vent hole facing upward is arranged on this transition conical surface.

[0120] The middle of the support column of the amplitude vibration table 303-04 is a long cylinder, and disc fixing plates are arranged at the front and rear ends of the cylinder. The disc fixing plate is provided with 4 bolt holes and is aligned and concentric with the threaded holes on the front and rear side walls of the base; the middle long cylinder of the support column of the amplitude vibration table 303-04 is inserted into the through holes on the front and rear side walls of the base of the amplitude vibration table 303-04 and the through holes on the front and rear sides of the vibration device of the amplitude vibration table 303-04, and the base, vibration device and support column of the amplitude vibration table 303-04 are tightly connected and fixed as a whole through the disc fixing plate of the support column of the amplitude vibration table 303-04.

[0121] The amplitude sensor 303-05 adopts a spoke sensor transmitter of model LZ-JX1, which has the advantages of high sensitivity and fast dynamic response. The amplitude sensor 303-05 is a disc-like structure, on which bolt holes are evenly arranged along the circumferential direction. Bolts are inserted into the threaded holes to fix the amplitude sensor 303-05 at the center of the left end of the amplitude vibration table 303-04.

[0122] The loading rod 303-02 is a stepped long shaft with rounded corners at the transition point. A threaded hole is provided at the center of its left end face, and a short screw with external threads is provided at the rightmost end. The short screw is inserted into the center hole of the nut 303-03 and fixedly connected with the threaded hole at the left end of the amplitude sensor 303-05.

[0123] The radial amplitude force loading socket 303-01 is identical in structure to the low-frequency and low-speed radial force loading socket 201-06. The short screw on the right side of the radial amplitude force loading socket 303-01 is assembled and fixedly connected with the threaded hole on the left end of the loading rod 303-02.

[0124] When the reliability loading test of the high-frequency and high-speed electric spindle is conducted, the amplitude vibration table 303-04 is started, and the loading rod 303-02 and the radial amplitude force loading ball socket 303-01 apply amplitude force to the high-frequency and high-speed loading unit force ball head 303-06 on the high-frequency and high-speed loading unit 302 under the drive of the amplitude vibration table 303-04, thereby realizing radial amplitude force loading on the high-frequency and high-speed loading unit 302. Because the amplitude vibration table 303-04 can apply a dynamic amplitude loading force of thousands of hertz to the high-frequency and high-speed loading unit 302, high-frequency loading of the high-frequency and high-speed loading unit 302 can be realized.

[0125] See also Fig.13 The towing torque loading device 304 of the present invention comprises an towing electric spindle clamp 304-01, a towing torque loading electric spindle 304-02, a coupling 304-03 and a high-frequency and high-speed simulation tool holder 304-04, wherein the coupling 304-03 is a standard part.

[0126] The towed electric spindle clamp 304-01 is a rectangular structure with a through hole in the middle, and threaded holes are evenly arranged around the through hole on the top surface. The intersection of the left and right side walls and the front end surface of the spindle clamp 304-01 is rounded, and long flat plates are arranged on the left and right sides of the spindle clamp 304-01. Four bolt holes with equal spacing are arranged on the long flat plates. Bolts are inserted into the bolt holes to tightly fix the spindle clamp 304-01 on the ground iron 5.

[0127] The torque-loading electric spindle 304-02 has the same structure as the electric spindle 102-05. The bolt hole on the flange of the torque-loading electric spindle 304-02 is aligned and concentric with the threaded hole on the top surface of the torque-loading electric spindle clamp 304-01. The bolt is inserted into the bolt hole on the flange of the torque-loading electric spindle 304-02 to fix the torque-loading electric spindle 304-02 on the torque-loading electric spindle clamp 304-01. A tapered hole is provided at the center of the top surface of the torque-loading electric spindle 304-02 to cooperate with the installation of the high-frequency and high-speed simulation tool holder 304-04.

[0128] The structure of the high-frequency, high-speed simulated tool handle 304-04 is exactly the same as that of the low-frequency, low-speed simulated tool handle 202-08. The pull pin and the conical tool handle head at the lower end of the high-frequency, high-speed simulated tool handle 304-04 are connected and fixed with the claws in the conical hole on the top surface of the torque-loading electric spindle 304-02. The upper end of the high-frequency, high-speed simulated tool handle 304-04 is locked and connected to the high-frequency, high-speed loading unit 302 through the coupling 304-03 to transmit torque.

[0129] When conducting a reliability loading test of a high-frequency and high-speed electric spindle, the tow torque loading electric spindle 304-02 is started to rotate, and the rated output torque of the tow torque loading electric spindle 304-02 is controlled to achieve accurate torque loading of the high-frequency and high-speed loading unit 302. During the test, the axis motion trajectory of the high-frequency and high-speed simulated tool holder 304-04 and other indicators reflecting the centering performance of the tow torque loading electric spindle 304-02 can be measured by a laser displacement sensor, thereby providing a data acquisition method for studying the influence of different radial forces on the centering performance of the tow torque loading electric spindle 304-02.

[0130] See also Figures 14 to 16 The high-frequency and high-speed axial force loading device 305 of the present invention comprises two guide column support seats 305-01 with the same structure, an axial force sensor 305-02, two axial force ear components with the same structure, two No. 2 loading forks 305-07 with the same structure, a push plate 305-08, a nut 305-09, a pull rod 305-10, a high-frequency and high-speed axial force loading electric cylinder 305-11, four No. 1 guide column fixing sleeves 305-12 with the same structure, a No. 1 support plate 305-13, two push plates with the same structure Plate guide sleeve 305-14, 2 push plate guide columns 305-15 with the same structure, 2 top wheels 305-16 with the same structure and 2 steel pins 305-17 with the same structure; wherein: 2 axial force ear assemblies with the same structure include 2 axial force ears 305-03 with the same structure, 8 tension sleeves 305-04 with the same structure, 8 No. 4 locking nuts 305-04 with the same structure, 4 steel wire ropes 305-06 with the same structure; nuts 305-09 and No. 4 nuts 305-04 are standard parts.

[0131] The guide column support seat 305-01 symmetrically distributed on both sides is a hollow structure above and below, and its structure is similar to a 6-shaped bracket. Two long through holes are set on the flat plate at the bottom end of the guide column support seat 305-01. Bolts are inserted into the long through holes to fix the guide column support seat 305-01 on the ground iron 5. Semi-cylindrical grooves are set at the front ends of the support plates at the upper end and the middle of the guide column support seat 305-01, and 4 threaded holes are set on both sides of the grooves.

[0132] The overall structure of the No. 1 support plate 305-13 is similar to a diamond-shaped thick flat plate. Through holes are provided at the left and right ends and the middle of the No. 1 support plate 305-13, and threaded holes are evenly provided around each through hole. A through hole is also provided at the lower right corner of the No. 1 support plate 305-13, and rounded corners are provided at the four corners of the No. 1 support plate 305-13. The top of the push plate guide sleeve 305-14 is provided with a circular flange, and bolt holes are evenly provided on the flange. The lower end of the push plate guide sleeve 305-14 is cylindrical. The annular flange is connected to the cylindrical body at the lower end, and the rotation axis of the annular flange and the cylindrical body at the lower end are colinear. A central through hole is provided at the center of the push plate guide sleeve 305-14, and the radius of the central through hole is the same as the cross-sectional radius of the push plate guide column 305-14; two push plate guide sleeves 305-14 with the same structure are installed in the through holes at the left and right ends of the No. 1 support plate 305-13, and the bottom end surface of the flange at the top of the push plate guide sleeve 305-14 contacts with the support plate 304-13 and is fixed to the support plate 304-13 by bolts.

[0133] The push plate guide column 305-15 is a long cylindrical straight rod shaft, which is inserted into the through holes set at the left and right ends of the push plate guide sleeve 305-14 and the No. 1 support plate 305-13 and installed in the semi-cylindrical groove of the support seat 305-01; the No. 1 guide column fixing sleeve 305-12 is composed of a middle semicircular shell and short plates on the left and right sides, and bolt holes are set on the short plates. The radius of the inner semicircular hole of the middle semicircular shell is equal to the radius at both ends of the push plate guide column 305-15. The inner surface of the semicircular shell of the No. 1 guide column fixing sleeve 305-12 is in contact with the push plate guide column 305-14, and the bolts are inserted into the bolt holes on the left and right sides of the No. 1 guide column fixing sleeve 305-12 to fix the push plate guide column 305-14 on the guide column support seat 305-01.

[0134] The high-frequency, high-speed axial force loading electric cylinder 305-11 is vertically installed below the lower right corner of support plate No. 1 305-13, and the upper end of the telescopic shaft of the high-frequency, high-speed axial force loading electric cylinder 305-11 is provided with a thread; the pull rod 305-10 is a stepped shaft, and a threaded hole is provided at the lower end near the high-frequency, high-speed axial force loading electric cylinder 305-11 and is connected and fixed with the telescopic shaft of the high-frequency, high-speed axial force loading electric cylinder 305-11. The upper end of the shoulder of the pull rod 305-10 is a short screw structure, and the shoulder of the pull rod 305-10 contacts the bottom end surface of support plate No. 1 305-13, and the screw at the upper end of the shoulder is inserted into the through hole at the lower right corner of support plate No. 1 305-13 and is locked and fixed by a locking nut 305-09.

[0135] The axial force sensor 305-02 located on the No. 1 support plate 305-13 is a circular ring structure, with a through hole in the middle thereof, which is concentric with the through hole in the middle of the push plate 305-08. Bolt holes are evenly arranged around the middle through hole of the axial force sensor 305-02, and the evenly arranged bolt holes are aligned and concentric with the threaded holes around the middle through hole of the No. 1 support plate 305-13. The bolts are inserted into the through holes on the axial force sensor 305-02 to fix the axial force sensor 305-02 on the No. 1 support plate 305-13.

[0136] The push plate 305-08 is a diamond-shaped flat plate structural member with a middle through hole in the middle. Four threaded holes are respectively provided at the front and rear ends of the push plate 305-08 in the longitudinal direction and are aligned concentrically with the bolt holes on the bottom plate of the No. 2 loading fork 305-07. Bolt holes are also evenly provided around the middle through hole of the push plate 305-08 and are aligned concentrically with the threaded holes around the middle through hole of the axial force sensor 305-02. Bolts are inserted into the bolt holes around the middle through hole of the push plate 305-08 to fix the push plate 305-08 to the top of the axial force sensor 305-02.

[0137] The two No. 2 loading forks 305-07 with the same structure are composed of a bottom plate, a middle support column and an upper fork. The bottom plate at the bottom end of the No. 2 loading fork 305-07 is a rectangular plate, and four bolt holes are set at the four corners of the bottom plate. The bolt holes on the rectangular plate are aligned and concentric with the threaded holes at the front and rear ends of the push plate 305-08. The upper end fork of the No. 2 loading fork 305-07 is composed of two front and rear fork walls and a bottom plate. The top ends of the two front and rear fork walls have rounded corners and are provided with coaxial through holes. The bottom ends of the two front and rear fork walls are vertically and symmetrically connected to the two ends of the bottom plate. The upper end fork is vertically connected to the top end surface of the middle support column through the bottom end surface of the bottom plate, and the bottom end of the middle support column is vertically connected to the center of the upper surface of the bottom plate; the No. 2 loading fork 305-07 is installed on the top end of the push plate 30-08, and the bolts are inserted into the bolt holes on the bottom plate of the No. 2 loading fork 305-07 to fix two No. 2 loading forks 305-07 with the same structure to the front and rear top ends of the push plate 305-08.

[0138] The top wheel 305-16 is a circular wheel with a central through hole and an annular arc-shaped groove around the periphery. The through hole arranged in the middle is concentric and has the same diameter as the through holes on the front and rear fork walls of the upper fork of the No. 2 loading fork 305-07. The steel pin 305-17 is inserted into the through holes on the front and rear fork walls of the No. 2 loading fork 305-07 and the central through hole of the top wheel 305-16 to install the top wheel 305-16 in the middle of the front and rear fork walls of the upper fork of the No. 2 loading fork 305-07.

[0139] The two axial force ears 305-03 with the same structure are composed of an outer mounting sleeve and an inner fixing plate, which are symmetrically installed at the top of the No. 2 loading fork 305-07; the front and rear ends of the outer mounting sleeve of the axial force ear 305-03 are both rectangular flat plates, a through hole is provided in the middle of the rear rectangular flat plate, and the intersection of the front and rear side plates and the left and right side walls is rounded, and the left and right side walls of the mounting sleeve are 8-shaped side walls, and threaded holes are provided on the top and bottom; the inner fixing plate of the axial force ear 305-03 is a A rectangular plate is provided with bolt holes at both ends thereof and is aligned and concentric with the threaded holes provided at the front and rear ends of the No. 2 bearing sleeve 302-01 of the high-frequency and high-speed loading unit 302; a groove is provided in the middle of the front side of the fixing plate of the axial force-bearing ear 305-03 and the width of the groove is the same as the upper and lower widths of the front side plate of the mounting sleeve of the axial force-bearing ear 305-03; the groove of the fixing plate of the axial force-bearing ear 305-03 is stuck on the rectangular plate on the front side of the mounting sleeve and contacts with the inner wall of the rectangular plate on the front side of the mounting sleeve. The rectangular flat plate of the outer mounting sleeve of the two axial force-bearing ears 305-03 with the same structure, which is close to the high-frequency and high-speed loading unit 302, is installed in the front and rear grooves of the No. 2 bearing sleeve 302-01 of the high-frequency and high-speed loading unit 302, and the inner fixing plates of the two axial force-bearing ears 305-03 with the same structure are in contact with the front and rear surfaces of the No. 2 bearing sleeve 302-01 of the high-frequency and high-speed loading unit 302, and the bolts are inserted into the bolt holes set at the upper and lower ends of the inner fixing plates of the two axial force-bearing ears 305-03 with the same structure to tightly fix the two axial force-bearing ears 305-03 with the same structure on the high-frequency and high-speed loading unit 302.

[0140] The tension sleeve 305-04 is similar to a bolt, with a head on the left and a screw on the right. The tension sleeve 305-04 is provided with a through hole at the center in the left-right direction. The tension sleeve 305-03 passes through the center hole of the nut and is connected and fixed with the threaded holes on the left and right 8-shaped side walls of the axial force ear 305-03.

[0141] The steel wire rope 305-06 passes through the tension sleeve 305-04, the nut 305-05 on the left side, and the upper and lower through holes of the 8-shaped side wall of the mounting sleeve outside the axial force ear 305-03 to form a closed loop and is tightened and fixed on the axial force ear 305-03. The lower side of the closed loop formed by the steel wire rope 305-06 passes through the gap between the top wheel 305-16 and the No. 2 loading fork 305-07, that is, the top wheel 305-16 is installed between the closed loop of the steel wire rope 305-06.

[0142] When conducting a reliability loading test of the high-frequency and high-speed electric spindle, the high-frequency and high-speed axial force loading electric cylinder 305-11 drives and pushes the No. 1 support plate 305-13 to move upward, and the No. 1 support plate 305-13 drives the push plate 305-08 to move upward, and the push plate 305-08 drives the No. 2 loading fork 305-07 to move upward, and the No. 2 loading fork 305-07 drives the top wheel 305-16 to move. When the top wheel 305-16 contacts the wire rope 305-06, the wire rope 305-06 is slowly tightened, and the tightened wire rope 305-06 applies an upward force to the axial force ear 305-03, and the axial force ear 305-03 transmits the force to the high-frequency and high-speed loading unit 302, thereby realizing the axial force simulation loading of the high-frequency and high-speed loading unit 302.

[0143] In summary, see Fig. 9 The high-frequency and high-speed radial mean force loading device 301 is installed on the left side of the low-frequency and low-speed loading unit 302 and is connected to the high-frequency and high-speed loading unit 302 through the No. 1 pull nail 301-06 and applies a radial mean force; the high-frequency and high-speed radial amplitude force loading device 303 is installed on the right side of the high-frequency and high-speed loading unit 302 and is connected to the high-frequency and high-speed loading unit 302 through the radial amplitude force loading socket 303-01 and applies a radial amplitude force; the high-frequency and high-speed axial force loading device 305 is installed directly below the high-frequency and high-speed loading unit 302 and above the drag torque loading device 304, and is connected to the high-frequency and high-speed loading unit 302 through the axial force ear 305-03 and applies an axial force; the drag torque loading device 304 is installed directly below the high-frequency and high-speed axial force loading device 305 and is connected to the high-frequency and high-speed loading unit 302 through the coupling 304-03 and applies torque;

[0144] When conducting a reliability loading test of a high-frequency and high-speed electric spindle, the high-frequency and high-speed radial mean force loading device 301 pulls the wire rope 301-05 and then pulls the No. 1 pull nail 301-06 to realize radial mean force loading on the high-frequency and high-speed loading unit 302. The amplitude vibration table 303-04 in the high-frequency and high-speed radial amplitude force loading device 303 acts on the high-frequency and high-speed loading unit loading ball head 303-06 through the radial amplitude force loading ball socket 303-01 on the flexible loading rod 303-02 to realize radial amplitude force loading on the high-frequency and high-speed loading unit 302. The towing torque loading device 304 realizes torque loading on the high-frequency high-speed loading unit 302 by controlling the rated output torque of the towing torque loading electric spindle 304-02, and the high-frequency high-speed axial force loading device 305 pushes the No. 1 support plate 305-13 through the high-frequency high-speed axial force loading electric cylinder 305-11, and then pushes the top wheel 305-16 to move and contact the wire rope 305-06 to give an axial force to the axial force ear 305-03, and then transmits it to the high-frequency high-speed loading unit 302 to realize axial force loading on the high-frequency high-speed loading unit 302. Therefore, under the joint action of the high-frequency high-speed radial mean force loading device 301, the high-frequency high-speed radial amplitude force loading device 303, the towing torque loading device 304 and the high-frequency high-speed axial force loading device 305, the comprehensive simulation loading of the high-frequency high-speed loading unit 302 can be realized, and then the high-frequency high-speed comprehensive simulation loading of the electric spindle under multiple working conditions by combining static and dynamic forces can be truly simulated.

[0145] 5. Reliability test system for electric spindle broaching mechanism

[0146] See also Fig.17The reliability test system 4 of the electric spindle broaching mechanism of the present invention comprises 8 counterweight blocks 401, 8 broaching mechanism simulation handles 402 with the same structure, 8 handle mounting seats 403 with the same structure, 8 broaching force dynamometers 404 with the same structure, a gear mounting seat 405, a top plate 406, 2 top plate guide sleeves 407 with the same structure, 2 top plate guide columns 408 with the same structure, a reduction motor 409, an electric cylinder 410, 4 No. 2 guide column fixing sleeves 411 with the same structure, a base 412, 4 support plate guide columns 413 with the same structure, a No. 2 support plate 414, 4 guide column anti-slip sleeves 415 with the same structure and a turntable 416; wherein: the handle mounting seat 403 comprises a bearing end cover 403-01, Sealing ring 403-02, No. 5 bearing 403-03, No. 3 sleeve 403-04; gear mounting seat 405 includes No. 2 support shaft 405-01, large gear locking nut 405-02, No. 4 gasket 405-03, large gear 405-04, No. 6 bearing 405-05, small gear locking nut 405-06, No. 5 gasket 405-07, small gear 405-08 and No. 7 bearing 405-09; sealing ring 403-02, No. 5 bearing 403-03, No. 3 sleeve 403-04, large gear locking nut 405-02, No. 4 gasket 405-03, No. 6 bearing 405-05, small gear locking nut 405-06 and No. 5 gasket 405-07 are all standard parts.

[0147] The base 412 is a square flat plate. The left and right sides of the base 412 are symmetrically provided with grooves with the same structure and open on the outside. The bottom of the groove is respectively provided with a long strip through hole. Bolts are inserted into the long strip through holes to fix the base 412, that is, the electric spindle broaching mechanism reliability test system 4 is fixed on the ground level iron 5 through the base 412. Four circular grooves with the same structure are provided at the four corners of the base 412. The diameter of the groove is the same as the cross-sectional diameter of the support plate guide column 413. Four threaded holes with the same structure are evenly provided around each groove.

[0148] The No. 2 guide column fixing seat 411 is a circular ring structure, and 4 bolt holes with the same structure are evenly arranged on the No. 2 guide column fixing seat 411 and are aligned and concentric with the 4 threaded holes with the same structure around the groove of the base 412. The radius of the middle through hole of the ring is the same as the cross-sectional radius of the support plate guide column 413;

[0149] The support plate guide column 413 is a long cylindrical straight rod structure with equal cross-section. Four support plate guide columns 413 with the same structure are installed in the groove on the base 412. The No. 2 guide column fixing seat 411 is sleeved on the support plate guide column 413 and is aligned and concentric with the threaded hole near the groove of the base 412. Bolts are inserted into the bolt holes of the No. 2 guide column fixing seat 411 to fix the No. 2 guide column fixing seat 411 and the support plate guide column 413 to the base 412.

[0150] The support plate No. 2 414 located above the electric cylinder 410 is also a square flat plate. Through holes are set at the four corners of the support plate No. 2 414. Threaded holes are evenly set on the upper and lower end surfaces around the through holes at the four corners of the support plate No. 2 414. The threaded holes are aligned and concentric with the bolt holes on the anti-slip sleeve 415. The four through holes on the support plate No. 2 414 are aligned with the four circular grooves on the base 412. The four support plate guide columns 413 are inserted into the four through holes with the same structure on the support plate No. 2 414 and are fixed by the upper and lower anti-slip sleeves 415. The anti-slip sleeve 415 is a circular ring structure. The anti-slip sleeve 415 is evenly set with bolt holes along the circumferential direction. It is installed at the upper and lower end surfaces of the support plate No. 2 414 and is connected and fixed to the support plate No. 2 414 by bolts.

[0151] See also Fig.18 The gear mounting seat 405 is located on the No. 2 support plate 414. Its main function is to drive the handle turntable 416 to rotate through gear transmission. The gear mounting seat 405 includes a No. 2 support shaft 405-01, a large gear locking nut 405-02, two No. 4 gaskets 405-03 with the same structure, a large gear 405-04, a No. 6 bearing 405-05, a small gear locking nut 405-06, two No. 5 gaskets 405-07 with the same structure, a small gear 405-08 and a No. 7 bearing 405-09.

[0152] The No. 2 support shaft 405-01 is a stepped shaft, which is installed at the geometric center of the No. 2 support plate 414, and its upper and lower ends are provided with keyways; the central part of the No. 2 support plate 414 is provided with a circular stepped groove, and the No. 6 bearing 405-05 is installed in the groove. The large gear 405-04 is installed on the No. 2 support shaft 405-01 above the No. 6 bearing 405-05, and is positioned by the shoulder on the No. 2 support shaft 405-01. The large gear 405-04 and the No. 2 support shaft 405-01 are connected by a key, and the upper and lower sides of the large gear 405-04 are both provided with No. 4 gaskets 405-03, and the No. 4 gaskets 405-03 are provided with large gear locking nuts 405-02 for positioning. The pinion 405-08 meshing with the large gear 405-04 is located on the right side, and a No. 5 gasket 405-07 and a pinion locking nut 405-06 are mounted on the pinion 405-08 to achieve positioning and locking, and another No. 5 gasket 405-07 and a No. 7 bearing 405-09 are mounted on the bottom of the pinion 405-08; the reduction motor 409 is located under the No. 2 support plate 414 and is fixed to the No. 2 support plate 414 by screws, and the power output shaft of the reduction motor 409 is inserted into the small through hole of the No. 2 support plate 414 and the inner ring hole of the No. 7 bearing 405-09, and a key connection is used between the power output shaft of the reduction motor 409 and the pinion 405-08 to achieve power transmission.

[0153] The tool handle turntable 416 is a disc-shaped flat plate structure. A blind hole and a keyway are arranged at the center of the bottom end of the tool handle turntable 416. The tool handle turntable 416 is mounted on the No. 2 support shaft 405-01 and connected by a key. When the reduction motor 409 is driven, the small gear 405-08 drives the large gear 405-04 to rotate, and the large gear 405-04 drives the tool handle turntable 416 to rotate. The tool handle turntable 416 drives the broaching mechanism simulated tool handle 402 to rotate. Therefore, the tool change operation of the broaching mechanism simulated tool handle 402 can be realized by controlling the reduction motor 409. The top of the tool handle turntable 416 is evenly and symmetrically provided with 8 circular stepped through holes along the circumference, each circular stepped through hole is installed with a tool handle mounting seat 403, and each tool handle mounting seat 403 is installed with a broaching mechanism simulation tool handle 402 of the same structure. The broaching mechanism simulation tool handle 402 is provided with counterweight blocks 401 of different weights, and the counterweight block 401 is a circular ring structure. The outer center of the circular ring structure is provided with a screw hole, and the screw is inserted into the screw hole to fix the counterweight block 401 on the broaching mechanism simulation tool handle 402. The upper and lower rings of different counterweight blocks 401 have different heights, so the weight is different, so that different broaches can be simulated to carry out the reliability test of the electric spindle broaching mechanism, thereby increasing the richness of the reliability test objects and the diversity of data of the electric spindle broaching mechanism.

[0154] See also Fig.19The tool handle mounting seat 403 of the present invention includes a broach mechanism simulated tool handle 402, a support plate 416, a bearing end cover 403-01, a sealing ring 403-02, a No. 5 bearing 403-03, a No. 3 sleeve 403-04 and a nut 403-05.

[0155] The broaching mechanism simulation handle 402 has a substantially similar structure to the low-frequency and low-speed simulation handle 202-08, with the slight difference being that the broaching mechanism simulation handle 402 is provided with threaded holes at the upper and bottom of the lower stepped shaft for connecting the counterweight 401 and the broaching force dynamometer 404.

[0156] The No. 5 bearing 403-03 is installed in the circular stepped through hole on the handle rotating disk 416, and the No. 3 sleeve 403-04, the sealing ring 403-02 and the bearing end cover 403-01 are installed above it, wherein the bottom end surface of the bearing end cover 403-01 is in contact with the upper end surface of the outer ring of the No. 5 bearing 403-03, and the bottom end surface of the flange on the bearing end cover 403-01 is in contact with the handle rotating disk 416 and is fixed by screw connection. Located at the lower end of the broaching mechanism simulated handle 402 is a broaching force dynamometer 404, the upper end of which is a short screw, and the center of the bottom end of the broaching mechanism simulated handle 402 is provided with a threaded hole, and the short screw of the broaching force dynamometer 404, which is equipped with a nut 403-05, is connected and fixed to the threaded hole at the center of the bottom end of the broaching mechanism simulated handle 402. When conducting reliability tests on the electric spindle broaching mechanism, the dynamometer can record the broaching force in real time and feed it back to the background computer control system for storage and other data processing.

[0157] The electric cylinder 410 located below the No. 2 support plate 414 adopts the RKC80L-S50-M0 folding guide frame servo electric cylinder, which has the advantages of stable loading and large load. The electric cylinder 410 is the main power source for pushing the No. 2 support plate 414 up and down. The top plate 406 installed on the top of the electric cylinder 410 is a rectangular flat plate, and its top surface is in contact with the bottom surface of the No. 2 support plate 414. A circular groove is arranged in the middle of the rectangular flat plate to cooperate with the telescopic axis of the electric cylinder 410. Bolt holes are arranged on the front and rear sides of the rectangle and are concentric with the threaded holes on the upper side of the guide column; two top plate guide columns 408 with the same structure are arranged at the front and rear ends of the top plate 406, and the top ends of the top plate guide columns 408 are arranged with threaded holes. Bolts are inserted into the bolt holes at the front and rear ends of the top plate to fix the top plate guide columns 408 on the top plate 406. The structure of the top plate guide sleeve 407 is the same as that of the push plate guide sleeve 305 - 14 , which is installed on the flat plate at the top of the electric cylinder 410 below the top plate 406 and fixed by bolts.

[0158] When conducting a reliability test of the electric spindle broaching mechanism, the electric cylinder 410 is started to drive the top plate 406 to move upward, and the No. 2 support plate 414 moves along the direction of the support plate guide column 413 under the push of the top plate 406. The No. 2 support plate 414 drives the entire tool handle turntable 416 to move upward. By controlling the electric cylinder 410, precise control of the vertical movement of the simulated tool handle 402 of the broaching mechanism can be achieved.

[0159] In summary, the electric cylinder 410 in the reliability test system for the electric spindle broaching mechanism of the present invention is started to drive the top plate 406 to push the No. 2 support plate 414 to move to an appropriate position along the vertical direction, and the electric spindle mobile positioning system 1 drives the electric spindle 102-05 in the spindle clamping device 102 to cooperate with each other to perform the broaching test. After the periodic broaching test data of a broaching mechanism simulated tool handle 402 is collected, the electric spindle 102-05 is driven by the electric spindle mobile positioning system 1 to separate from the broaching mechanism simulated tool handle 402. At this time, the reduction motor 409 drives to perform the tool changing operation, and the reduction motor 409 drives The small gear 405-08 rotates, and the small gear 405-08 drives the large gear 405-04 to rotate, and the large gear 405-04 drives the tool handle turntable 416 to rotate, and the tool handle turntable 416 drives the broaching mechanism simulated tool handle 402 to rotate to complete the tool change operation. After the tool change operation is completed, the electric spindle 102-05 is driven by the electric spindle mobile positioning system 1 to re-coordinate with the new tool handle to perform the reliability test of the electric spindle broaching mechanism. The above process is repeated until the relevant experimental data of all tool handles are collected. After the experiment is completed, the electric cylinder 410 is started again to send the No. 2 support plate 414 to the initial position, and the experiment ends. By performing broaching experiments on multiple simulated tool handles, rich data can be obtained, which provides data support for the subsequent electric spindle reliability detection and analysis.

[0160] The embodiments described in the present invention are intended to facilitate the understanding and application of the present invention by those skilled in the art. The present invention is only an optimized example, or a better specific technical solution. If relevant technical personnel adhere to the basic technical solution of the present invention, make equivalent structural changes or various modifications that do not require creative work, they are all within the protection scope of the present invention.

Claims

1. A comprehensive electric spindle reliability loading test device, characterized in that: The comprehensive electric spindle reliability loading test device comprises an electric spindle moving positioning system (1), a low-frequency and low-speed electric spindle reliability loading test system (2), a high-frequency and high-speed electric spindle reliability loading test system (3), an electric spindle broaching mechanism reliability test system (4) and a ground level iron (5); The ground leveling iron (5) is a rectangular plate casting, the top of the ground leveling iron (5) is provided with T-shaped grooves of the same structure and parallel to each other, the bottom of the ground leveling iron (5) is provided with a weight reduction groove, and two rectangular grooves are provided in the middle of the top of the ground leveling iron (5); The electric spindle moving positioning system (1) is installed on the horizontal iron (5) through the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B), the low-frequency and low-speed electric spindle reliability loading test system (2) is installed on the horizontal iron (5) between the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B), the high-frequency and high-speed electric spindle reliability loading test system (3) is installed on the horizontal iron (5) on the left side of the low-frequency and low-speed electric spindle reliability loading test system (2), and the electric spindle broaching mechanism reliability test system (3) is installed on the horizontal iron (5) on the left side of the low-frequency and low-speed electric spindle reliability loading test system (2). The test system (4) is installed on the horizontal iron (5) on the left side of the high-frequency and high-speed electric spindle reliability loading test system (3); the electric spindle (102-05) in the electric spindle mobile positioning system (1), the low-frequency and low-speed loading unit (202) in the low-frequency and low-speed electric spindle reliability loading test system (2), the high-frequency and high-speed loading unit (302) in the high-frequency and high-speed electric spindle reliability loading test system (3) and the 8 broaching mechanism simulation handles (402) with the same structure in the electric spindle broaching mechanism reliability test system (4) have their rotation axes perpendicular to the horizontal iron (5).

2. A comprehensive electric spindle reliability loading test device according to claim 1, characterized in that: The electric spindle moving positioning system (1) further comprises an electric spindle simulated tool holder matching device (102) and a moving gantry (103); The first precision ball screw (101-A) and the second precision ball screw (101-B) are symmetrically installed on the front and rear sides of the horizontal iron (5) by using T-shaped bolts, and the longitudinal symmetry planes of the first precision ball screw (101-A) and the second precision ball screw (101-B) are parallel to the longitudinal symmetry plane of the horizontal iron (5); the movable gantry (103) is installed on the first precision ball screw (101-A) and the second precision ball screw (101-B) by using bolts and through three connecting plates at the bottom ends of the front and rear pillars. On the lead screw (101-B), the front lead screw nut seat and the rear lead screw nut seat at the bottom end of the connecting plate at the bottom end of the main support in the front support and the rear support of the mobile gantry (103) and the lead screw nuts on the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B) are assembled and fixed with screws; the electric spindle simulation tool handle matching device (102) is installed on the middle crossbeam of the mobile gantry (103) through the No. 4 precision ball screw (102-B) and fixed with bolts.

3. A comprehensive electric spindle reliability loading test device according to claim 2, characterized in that: The electric spindle simulated tool handle matching device (102) further comprises a No. 3 precision ball screw (102-A), a tool-beating cylinder (102-01), a vertical guide rail mounting plate (102-02), a spindle water jacket (102-03), a spindle clamp (102-04) and a coupling plate (102-06); wherein: the No. 3 precision ball screw (102-A) and the No. 4 precision ball screw (102-B) have the same structure; The No. 4 precision ball screw (102-B) is fixedly installed horizontally at the middle of the middle cross beam of the moving gantry (103) by bolts, the No. 3 precision ball screw (102-A) is fixedly installed on the vertical guide rail mounting plate (102-02) by bolts, the No. 3 guide rail slider in the No. 3 precision ball screw (102-A) is fixedly connected with the joint plate (102-06) by screws, and the joint plate (102-06) installed with the No. 3 precision ball screw (102-A) is bolted to the No. 4 guide rail slider in the No. 4 precision ball screw (102-B); The electric spindle (102-05) is installed in the spindle water jacket (102-03) and fixedly connected by bolts, the spindle water jacket (102-03) equipped with the electric spindle (102-05) is installed in the spindle clamp (102-04) and fixedly connected by bolts, the top of the electric spindle (102-05) is installed with a spindle knife cylinder (102-01), and the spindle clamp (102-04) is fixedly connected to the lower end of the left side wall of the vertical guide rail mounting plate (102-02) by bolts.

4. A comprehensive electric spindle reliability loading test device according to claim 2, characterized in that: The movable gantry (103) is a large-scale portal structure made by casting. The movable gantry (103) comprises a front support, a rear support and an intermediate cross beam. The top ends of the front support and the rear support and the two ends of the intermediate cross beam are vertically connected to form an integral portal structure. The front support and the rear support have the same structure. Both the front support and the rear support are composed of a main support, a left auxiliary support and a right auxiliary support. The left auxiliary support and the right auxiliary support have the same structure. The left auxiliary support and the right auxiliary support are symmetrically arranged on the left and right sides of the main support. The top ends of the left auxiliary support and the right auxiliary support and the left and right side walls of the lower end of the main support are integrally connected. A group of three connecting plates are fixed to the bottom ends of the front and rear pillars, respectively. The connecting plates on the bottom ends of the left and right auxiliary pillars have the same structure. Each group of three connecting plates are rectangular plate-like structural members. Each connecting plate is evenly provided with 4 groups of 16 bolt holes. A group of bolt holes on each connecting plate and the threaded holes on the No. 1 guide slider and the No. 2 guide slider in the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B) are aligned and concentric. The connecting plates of the main pillars in the front and rear pillars are A front screw nut seat and a rear screw nut seat matched with the No. 1 screw nut and the No. 2 screw nut on the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B) are fixed at the bottom center, and the mobile gantry (103) is fixedly connected by screws through three connecting plates at the bottom ends of the front and rear pillars and 12 No. 1 guide sliders with the same structure and 12 No. 2 guide sliders with the same structure on the No. 1 precision ball screw (101-A) and the No. 2 precision ball screw (101-B).

5. A comprehensive electric spindle reliability loading test device according to claim 1, characterized in that: The low-frequency and low-speed electric spindle reliability loading test system (2) further comprises a low-frequency and low-speed radial force loading device (201), a low-frequency and low-speed torque loading device (203) and a low-frequency and low-speed axial force loading device (204); The low-frequency and low-speed radial force loading device (201) is fixed on the ground iron (5) through the support plate (201-04) therein; the low-frequency and low-speed loading unit (202) is vertically installed on the front side of the low-frequency and low-speed radial force loading device (201); the low-frequency and low-speed axial force loading device (204) is installed on the front side of the low-frequency and low-speed loading unit (202); and the low-frequency and low-speed torque loading device (203) is installed on the ground iron (5) on the right side of the low-frequency and low-speed loading unit (202) through the dynamometer base (203-02) therein; The low-frequency, low-speed radial force loading ball socket (201-05) on the low-frequency, low-speed radial force loading device (201) is aligned and concentric with the low-frequency, low-speed radial force loading ball head (201-06) installed on the low-frequency, low-speed loading unit (202); the dynamometer (203-01) in the low-frequency, low-speed torque loading device (203) is installed on the dynamometer base (203-02); the transmission shaft of the dynamometer (203-01) and the No. 1 bevel gear (202-14) on the low-frequency, low-speed loading unit (202) are key-connected; the low-frequency, low-speed axial force loading device (204) is symmetrically fixed on the No. 1 bearing sleeve (202-02) of the low-frequency, low-speed loading unit (202) through a No. 1 loading fork (204-07) thereof and two lever pull nails (204-06) with the same structure.

6. A comprehensive electric spindle reliability loading test device according to claim 5, characterized in that: The low-frequency and low-speed radial force loading device (201) comprises a radial electro-hydraulic servo loader (201-01), an intermediate force plate (201-02), two brackets (201-03) with the same structure, a support plate (201-04), a low-frequency and low-speed radial force loading ball socket (201-05) and a low-frequency and low-speed radial force loading ball head (201-06); Two brackets (201-03) with the same structure are symmetrically installed at the left and right ends of the support plate (201-04), the bottom ends of the two brackets (201-03) with the same structure and the left and right ends of the support plate (201-04) are connected by bolts, the intermediate force plate (201-02) is installed on the top of the two brackets (201-03) with the same structure, the radial electro-hydraulic servo loader (201-01) is installed on the intermediate force plate (201-02), the radial electro-hydraulic servo loader (201-01), the intermediate force plate (201-02) and the tops of the two brackets (201-03) with the same structure are contacted and connected in sequence, and the three are fixedly connected by bolts; the low-frequency and low-speed radial force loading ball socket (201-05) is installed on the force sensor at the rightmost end of the radial electro-hydraulic servo loader (201-01), and the low-frequency and low-speed radial force loading ball head (201-06) is installed on the low-frequency and low-speed loading unit (202).

7. A comprehensive electric spindle reliability loading test device according to claim 5, characterized in that: The low-frequency and low-speed axial force loading device (204) comprises an axial electro-hydraulic servo loader (204-01), a low-frequency and low-speed axial force loading ball head (204-02), a low-frequency and low-speed axial force loading ball socket (204-03), a lever support seat (204-04), a lever (204-05), a lever pull nail (204-06) and a No. 1 loading fork (204-07); The axial electro-hydraulic servo loader (204-01) is vertically installed in a rectangular groove arranged in the middle of the ground iron (5) and is fixedly connected to the ground iron (5) by bolts. The lever support seat (204-04) is installed on the ground iron (5) on the left side of the axial electro-hydraulic servo loader (204-01) and is fixedly connected by bolts. The lever (204-05) is installed on the No. 1 support shaft (204-04-05) of the lever support seat (204-04) through a through hole in the middle thereof for rotation connection. The low frequency The low-speed axial force loading ball head (204-02) is fixed to the rightmost end of the lever (204-05) by threaded connection, and is concentric with the spherical groove of the low-frequency low-speed axial force loading ball socket (204-03) fixed to the top of the axial electro-hydraulic servo loader (204-01). The No. 1 loading fork (204-07) is installed at the leftmost end of the lever (204-05), and two lever pull nails (204-06) with the same structure are symmetrically installed on the No. 1 loading fork (204-07), and the two are rotationally connected.

8. A comprehensive electric spindle reliability loading test device according to claim 1 or 5, characterized in that: The low-frequency and low-speed loading unit (202) comprises a bearing upper end cover (202-01), a No. 1 bearing sleeve (202-02), a bearing lower end cover (202-03), a No. 1 bearing (202-04), a No. 1 gasket (202-05), a No. 1 locking nut (202-06), a No. 1 sleeve (202-07), a low-frequency and low-speed simulated tool handle (202-08), a No. 2 bearing (202-09), a bearing retaining ring (202-10), a No. 2 gasket (202-11), a No. 2 locking nut (202-12), a shaft sleeve (202-13), a No. 1 bevel gear (202-14), a No. 2 bevel gear (202-15) and a No. 3 bearing (202-16); The upper end cover (202-01) of the bearing, the No. 1 bearing sleeve (202-02) and the lower end cover (202-03) of the bearing are mounted on the low-frequency and low-speed simulation tool holder (202-08) from top to bottom, and two No. 2 bearings (202-09) with the same structure, a bearing retaining ring (202-10), a No. 2 gasket (202-11) and a No. 2 locking nut (202-12) are located on the upper end cover (202-01) of the bearing, the No. 1 bearing sleeve (202-02) and the lower end cover (2 02-03), and is simultaneously mounted on the low-frequency and low-speed simulation tool holder (202-08) from top to bottom, the bearing retaining ring (202-10) is located between two No. 2 bearings (202-09) of the same structure, the upper and lower end faces of the bearing retaining ring (202-10) are respectively in contact with the lower and upper end faces of the outer bearing rings of the two No. 2 bearings (202-09) of the same structure, and the No. 2 gasket (202-11) is installed between the No. 2 bearing (202-09) located below and the No. 2 bearing (202-09). The upper and lower end surfaces of the No. 2 gasket (202-11) are respectively in contact with the bottom end surface of the inner bearing ring of the No. 2 bearing (202-09) located below and the top end surface of the No. 2 locking nut (202-12), the top end surface of the inner bearing ring of the No. 2 bearing (202-09) located above is in contact with the upper shaft shoulder on the low-frequency and low-speed simulation tool handle (202-08), and the No. 2 locking nut (202-12) is in contact with the low-frequency and low-speed simulation tool handle (202 -08) are threadedly connected, the inner bearing rings of the two No. 2 bearings (202-09) with the same structure are statically matched with the low-frequency and low-speed simulation tool holder (202-08), the outer bearing rings of the two No. 2 bearings (202-09) with the same structure are transitionally matched with the No. 1 bearing sleeve (202-02), and the upper end cover (202-01) and the lower end cover (202-03) of the bearing are respectively fixedly connected with the top and bottom ends of the No. 1 bearing sleeve (202-02) by screws; The No. 1 bearing (202-04) is sleeved on the low-frequency and low-speed simulation tool holder (202-08); the top end surface of the inner bearing ring of the No. 1 bearing (202-04) is in contact connection with the shaft shoulder at the middle position of the low-frequency and low-speed simulation tool holder (202-08); the No. 1 bevel gear (202-14) is sleeved on the low-frequency and low-speed simulation tool holder (202-08); the two are connected by a key; the top end surface of the No. 1 bevel gear (202-14) is in contact connection with the shaft shoulder at the lower end position of the low-frequency and low-speed simulation tool holder (202-08); the shaft sleeve (202-13) is installed between the No. 1 bearing (202-04) and the No. 1 bevel gear (202-14); ... A No. 1 gasket (202-05) and a No. 1 locking nut (202-06) are installed below the No. 2 bevel gear (202-15) and the No. 3 bearing (202-16), and the three are contact-connected in sequence; the No. 2 bevel gear (202-15) and the No. 3 bearing (202-16) are mounted on the transmission shaft of the dynamometer (203-01) in the low-frequency and low-speed torque loading device (203); the No. 1 sleeve (202-07) is mounted on the transmission shaft of the dynamometer (203-01) between the No. 2 bevel gear (202-15) and the No. 3 bearing (202-16), and the three are contact-connected in sequence, and the No. 1 bevel gear (202-14) and the No. 2 bevel gear (202-15) are meshingly connected.

9. A comprehensive electric spindle reliability loading test device according to claim 1, characterized in that: The high-frequency and high-speed electric spindle reliability loading test system (3) further comprises a high-frequency and high-speed radial mean force loading device (301), a high-frequency and high-speed radial amplitude force loading device (303), a drag torque loading device (304) and a high-frequency and high-speed axial force loading device (305); The high-frequency and high-speed radial mean force loading device (301) is fixed to the ground iron (5) by bolts through the mean electric cylinder support seat (301-02) therein; the high-frequency and high-speed radial amplitude force loading device (303) is installed on the right side of the high-frequency and high-speed radial mean force loading device (301) and is fixedly connected to the ground iron (5) by bolts through the base of the amplitude vibration table (303-04) therein; the high-frequency and high-speed loading unit (302) is installed between the high-frequency and high-speed radial mean force loading device (301) and the high-frequency and high-speed radial amplitude force loading device (303); the No. 1 pull nail (301-06) in the high-frequency and high-speed radial mean force loading device (301) is fixedly installed on the left side of the No. 2 bearing sleeve (302-01) in the high-frequency and high-speed loading unit (302); the radial amplitude force loading ball socket (303-01) in the high-frequency and high-speed radial amplitude force loading device (303) and the high-frequency and high-speed loading unit force ball head (303-01) on the right side of the high-frequency and high-speed loading unit (302) are connected. The high-frequency and high-speed axial force loading device (305) is installed directly below the high-frequency and high-speed loading unit (302) and fixedly installed on the ground level iron (5) through two guide column support seats (305-01) with the same structure. The upper end of the high-frequency and high-speed axial force loading device (305) is connected to the front and rear of the high-frequency and high-speed axial force loading device (305) through two axial force ear components with the same structure and the No. 2 bearing sleeve (302-01) in the high-frequency and high-speed axial force loading device (305). The towing torque loading device (304) is located between two guide column support seats (305-01) of the same structure, the towing torque loading device (304) is fixedly connected to the groove on the ground level iron (5) through the towing electric spindle clamp (304-01) and bolts, and the coupling (304-03) at the top of the towing torque loading device (304) is matched with the stepped shaft at the lower end of the high-frequency and high-speed simulated tool handle (304-04) in the high-frequency and high-speed loading unit (302).

10. A comprehensive electric spindle reliability loading test device according to claim 9, characterized in that: The high-frequency and high-speed radial mean force loading device (301) comprises a mean electric cylinder (301-01), a mean electric cylinder support seat (301-02), an electric cylinder connecting sleeve (301-03), a force sensor (301-04), a loading wire rope (301-05), a No. 1 pull nail (301-06) and a No. 2 pull nail (301-07); The mean electric cylinder (301-01) is installed on the support plate in the mean electric cylinder support seat (301-02), and the right side of the mean electric cylinder (301-01) is fixed to the support wall in the mean electric cylinder support seat (301-02) by screws, and the right end of the telescopic shaft of the mean electric cylinder (301-01) is inserted into the through hole at the upper end of the support wall in the mean electric cylinder support seat (301-02) and then assembled with the threaded hole at the left end of the electric cylinder connecting sleeve (301-03). The short screw on the right side of the electric cylinder connecting sleeve (301-03) is assembled and connected with the threaded hole on the left side of the force sensor (301-04), the threaded hole at the right end of the force sensor (301-04) is assembled and connected with the short screw on the left side of the No. 2 pull nail (301-07), and the left and right ends of the loading wire rope (301-05) pass through the center through holes of the No. 2 pull nail (301-07) and the No. 1 pull nail (301-06) respectively and are fixedly connected to form a wire rope closed loop.

11. A comprehensive electric spindle reliability loading test device according to claim 9, characterized in that: The high-frequency and high-speed axial force loading device (305) further comprises two guide column support seats (305-01) with the same structure, an axial force sensor (305-02), two No. 2 loading forks (305-07) with the same structure, a push plate (305-08), a nut (305-09), a pull rod (305-10), a high-frequency and high-speed axial force loading electric cylinder (305-11), four No. 1 guide column fixing sleeves (305-12) with the same structure, a No. 1 support plate (305-13), two push plate guide sleeves (305-14) with the same structure, two push plate guide columns (305-15) with the same structure, two top wheels (305-16) with the same structure and two steel pins (305-17) with the same structure; The two guide column support seats (305-01) with the same structure are symmetrically distributed on the left and right sides, and the two push plate guide columns (305-15) with the same structure are symmetrically installed in the semi-cylindrical grooves at the upper ends and the middle of the two guide column support seats (305-01) with the same structure by using four No. 1 guide column fixing sleeves (305-12) with the same structure and bolts. The No. 1 support plate (305-13) is sleeved on the two push plate guide columns (305-15) with the same structure through two push plate guide sleeves (305-14) with the same structure. The axial force sensor (305-02) is installed at the center of the top surface of the No. 1 support plate (305-13) and fixed by bolts. The push plate (305-08) is fixed at the center of the top of the axial force sensor (305-02) by screws. The bottom ends of the two No. 2 loading forks (305-07) with the same structure are fixed by bolts at the front and rear positions of the top of the push plate (305-08). The upper ends of the two identical No. 2 loading forks (305-07) are rotatably connected by two identical steel pins (305-17) and two identical top wheels (305-16). The two identical axial force ear assemblies are mounted on the upper ends of the two identical No. 2 loading forks (305-07). Meanwhile, the four identical steel wire ropes (305-06) in the two identical axial force ear assemblies are located between the two identical top wheels (3 05-16); the high-frequency and high-speed axial force loading electric cylinder (305-11) is installed below the lower right corner of the No. 1 support plate (305-13), the lower end of the pull rod (305-10) is threadedly connected to the output end of the telescopic shaft of the high-frequency and high-speed axial force loading electric cylinder (305-11), and the upper end of the pull rod (305-10) is inserted into the bolt hole at the lower right corner of the No. 1 support plate (305-13) and is locked and fixed with a locking nut (305-09).

12. A comprehensive electric spindle reliability loading test device according to claim 1, characterized in that: The electric spindle broaching mechanism reliability test system (4) also includes 8 counterweights (401), 8 tool handle mounting seats (403) with the same structure, 8 dynamometers (404) with the same structure, a gear mounting seat (405), a top plate (406), 2 top plate guide sleeves (407) with the same structure, 2 top plate guide columns (408) with the same structure, a reduction motor (409), an electric cylinder (410), 4 No. 2 guide column fixing sleeves (411) with the same structure, a base (412), 4 support plate guide columns (413) with the same structure, a No. 2 support plate (414), 4 guide column anti-slip sleeves (415) with the same structure and a turntable (416); The base (412) is fixed to the ground iron (5) by bolts, the bottom ends of four support plate guide columns (413) with the same structure are installed at the four corners of the base (412), the four support plate guide columns (413) with the same structure are perpendicular to the base (412), four No. 2 guide column fixing sleeves (411) with the same structure are sleeved on the lower ends of the four support plate guide columns (413) with the same structure, and the four No. 2 guide column fixing sleeves (411) with the same structure are fixedly connected to the base (412) by bolts; The No. 2 support plate (414) is sleeved on four support plate guide columns (413) with the same structure through guide column anti-slip sleeves (415) installed at the four corners; the gear mounting seat (405) is installed at the center of the No. 2 support plate (414) through the No. 2 support shaft (405-01) for rotation connection; the turntable (416) is installed on the top of the No. 2 support shaft (405-01), and the two are key-connected; 8 tool handles (402) with the same structure are installed in 8 circular stepped through holes on the turntable (416) through 8 tool handle mounting seats (403) with the same structure; 8 counterweight blocks (401) are sleeved Installed on 8 tool handles (402) with the same structure, 8 dynamometers (404) with the same structure are installed in the threaded holes at the center of the bottom ends of the 8 tool handles (402) with the same structure by threaded connection; the reduction motor (409) is installed under the No. 2 support plate (414) and fixedly connected with the No. 2 support plate (414) by screws, the power output shaft of the reduction motor (409) is inserted into the small through hole of the No. 2 support plate (414) and the inner ring hole of the bearing (405-09), and the power output shaft of the reduction motor (409) is connected to the small gear (405-08) in the gear mounting seat (405) by a key; The electric cylinder (410) is mounted on a base (412) directly below the center of the No. 2 support plate (414). The telescopic shaft of the electric cylinder (410) is fixedly connected to the center of the rectangular flat top plate (406). Two top plate guide columns (408) with the same structure are fixedly connected to the front and rear ends of the top plate (406) by bolts. The two top plate guide columns (408) with the same structure are mounted in two guide sleeves (407) with the same structure on the electric cylinder (410) for sliding connection.

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