A high-precision orthogonal rotary axis system based on ball bearings

Abstract

The present invention provides a high-precision orthogonal rotating axis system based on a dense bead bearing, including a horizontal left dense bead shaft system, a horizontal right dense bead shaft system and a vertical dense bead shaft system; the horizontal left dense bead shaft system and the horizontal right dense bead shaft system are arranged in mirror symmetry, and a gap is left between them, the horizontal left dense bead shaft system and the horizontal right dense bead shaft system are both arranged on the top of the vertical dense bead shaft system, the bearing axis of the vertical dense bead shaft system is located between the horizontal left dense bead shaft system and the horizontal right dense bead shaft system, and is perpendicular to the bearing axis of the horizontal left dense bead shaft system; the small diameter end of the bearing of the horizontal left dense bead shaft system and the horizontal right dense bead shaft system is used to clamp the measuring module. The adoption of this scheme greatly increases the accuracy of the shaft system rotation and the measurement accuracy of the precision measuring instrument, and is also conducive to reducing the influence of thermal deformation on the accuracy of the shaft system.

Description

Technical Field

[0001] The invention relates to the field of precision measurement, and in particular to a high-precision orthogonal rotary axis system based on a dense ball bearing. Background Art

[0002] High-precision orthogonal rotary axis system is an important component of precision measuring instruments, especially in large-scale space measuring instruments and equipment represented by laser trackers. The research on orthogonal rotary axis system abroad is very mature, and it has typical applications in API, Leica, Faro and Etalon laser trackers, while China started late in this regard. The key to restricting the development of high-precision orthogonal rotary axis system lies in the design and manufacture of high-precision orthogonal rotary axis system. Orthogonal rotary axis systems in current measuring instruments mostly use ordinary axis systems or cylindrical axis systems. The rotation accuracy of the axis system is low, which seriously affects the measurement accuracy of precision measuring instruments and restricts the development of precision measuring instruments to a large extent. During the use of the axis system, due to the influence of temperature, the orthogonal rotary axis system produces large thermal deformation, which reduces the service life and accuracy of the axis system. In addition, the orthogonal rotary axis system developed in China is mostly used for inertial technology test equipment. The axis system structure design is complex and the overall weight is bulky, which is not conducive to the miniaturization and portability of measuring instruments. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a high-precision orthogonal rotating axis system based on ball bearings. The adoption of this solution greatly increases the accuracy of axis system rotation and the measurement accuracy of precision measuring instruments, and is also beneficial to reducing the influence of thermal deformation on axis system accuracy.

[0004] The technical solution adopted by the present invention is: a high-precision orthogonal rotary axis system based on a dense ball bearing, including a horizontal left dense ball bearing axis system, a horizontal right dense ball bearing axis system and a vertical dense ball bearing axis system;

[0005] The horizontal left dense bead shaft system, the horizontal right dense bead shaft system and the vertical dense bead shaft system all include a bearing seat, a bearing, a first rolling support part, a second rolling support part and a third rolling support part. The bearing is installed in the bearing hole of the bearing seat. The bearing is step-shaped. An annular boss is provided in the middle of the side surface of the bearing. A first rolling support part is provided on one side of the annular boss, and a second rolling support part is provided on the other side of the annular boss. A third rolling support part is provided on the side surface of the small shaft diameter and / or the large shaft diameter of the bearing. The bearing can rotate around its own axis, and a T-shaped structure is formed between each shaft end of the bearing and the bearing.

[0006] The horizontal left dense bead shaft system and the horizontal right dense bead shaft system are symmetrically arranged with a gap between them. The horizontal left dense bead shaft system and the horizontal right dense bead shaft system are both arranged on the top of the vertical dense bead shaft system. The bearing axis of the vertical dense bead shaft system is located between the horizontal left dense bead shaft system and the horizontal right dense bead shaft system, and is perpendicular to the bearing axis of the horizontal left dense bead shaft system. The small diameter ends of the bearings of the horizontal left dense bead shaft system and the horizontal right dense bead shaft system are used to clamp the measuring module.

[0007] When this scheme is in operation, the horizontal left bead-shaped axis system and the horizontal right bead-shaped axis system are mirror-symmetrically arranged, and a gap is left between the horizontal left bead-shaped axis system and the horizontal right bead-shaped axis system, and the gap is used to place the measuring module. At this time, the two bearings are mirror-symmetrical and rotate coaxially, and the measuring module is clamped between the two bearings. When the two bearings rotate coaxially, the measuring module can be driven to rotate, so that the measuring module measures data, wherein the measuring module can select a laser measuring module, etc.; wherein the intersection of the bearing axis of the vertical bead-shaped axis system, the horizontal left bead-shaped axis system and the horizontal right bead-shaped axis system is set as the origin, and this point is used as the reference origin used by the orthogonal rotary axis system. This reference origin is also the intersection of the optical axis axis of the measuring module, the horizontal axis system axis and the vertical axis system axis, and a spherical coordinate system is established with this origin. The three bearings in this scheme all adopt a step shape, and the shafts and bearings in the bearings are arranged in a T-shaped structure. By coordinating with the first rolling support part, the second rolling support part and the third rolling support part, the accuracy of the shaft system rotation and the measurement accuracy of the precision measuring instrument are improved; and the third rolling support part is used to achieve radial fixation, and the first rolling support part and the second rolling support part are used to achieve axial fixation. When the rotating shaft system moves, the vertical dense bead shaft system undergoes thermal elongation due to the influence of temperature. Since the upper part of the vertical dense bead shaft system is fixed, the influence of temperature on the horizontal left dense bead shaft system and the horizontal right dense bead shaft system can be avoided; the left end of the horizontal left dense bead shaft system is fixed, and the right end of the horizontal right dense bead shaft system is fixed. Therefore, due to the temperature, the horizontal left dense bead shaft system can only elongate to the right end, while the horizontal right dense bead shaft system can only elongate to the left end. The horizontal left dense bead shaft system and the horizontal right dense bead shaft system have symmetrical structures, and thermal deformation can offset each other. Therefore, this structure is also beneficial to reducing the influence of thermal deformation on the accuracy of the shaft system.

[0008] Further optimization is performed so that the first rolling support portion, the second rolling support portion and the third rolling support portion are all ball bearings.

[0009] When this solution is implemented, the first rolling support part, the second rolling support part and the third rolling support part are all ball bearings, and the ball bearings have a certain interference fit during the assembly process. The error equalization effect of the ball bearings is used to improve the accuracy of the shaft system and reduce the overall manufacturing difficulty.

[0010] Further optimization is carried out in which a first encoder is provided at the large shaft diameter end of the bearing of the horizontal left bead-shaped shaft system, and a second encoder is provided at the bottom of the bearing of the vertical bead-shaped shaft system, and both the first encoder and the second encoder are used to measure the angle during rotation.

[0011] When this scheme is in operation, a first encoder is provided at the large diameter end of the bearing of the horizontal left bead-joint axis system, and a second encoder is provided at the bottom of the bearing of the vertical bead-joint axis system. The first encoder is used to measure the pitch angle during rotation, and the second encoder is used to measure the azimuth angle during rotation. The first encoder and the second encoder compile and convert the obtained data into a signal form that can be used for communication, transmission and storage.

[0012] Further optimized, the horizontal left dense bead shaft system also includes a first mounting plate, the first encoder is connected to the shaft neck of the large shaft diameter end of the bearing through the first mounting plate, the first mounting plate is provided with an inner hole, and the inner hole of the first mounting plate and the shaft neck of the large shaft diameter end of the bearing are clearance-matched;

[0013] The vertical bead-type shaft system also includes a second mounting plate, the second encoder is connected to the shaft neck at the bottom of the bearing through the second mounting plate, an inner hole is provided on the second mounting plate, and a clearance fit is provided between the inner hole of the second mounting plate and the shaft neck at the bottom of the bearing.

[0014] Further optimization is carried out in which a first motor is provided on the horizontal right bead-locked shaft system, and a second motor is provided on the vertical bead-locked shaft system. The first motor is used to drive the bearings of the horizontal left bead-locked shaft system and the horizontal right bead-locked shaft system to rotate, and the second motor is used to drive the bearings of the vertical bead-locked shaft system to rotate.

[0015] Further optimization, the horizontal right bead-type shaft system also includes a third mounting plate, the first motor is connected to the bearing via the third mounting plate, an inner hole is provided on the third mounting plate, and a clearance fit exists between the third mounting plate and the journal at the large shaft diameter end of the bearing;

[0016] The vertical bead-type shaft system also includes a fourth mounting plate, the second motor is connected to the bearing via the fourth mounting plate, the fourth mounting plate is located at the lower end of the second motor, and there is an interference fit between the fourth mounting plate and the bottom journal of the bearing.

[0017] Further optimization, the horizontal left bead-locked shaft system, the horizontal right bead-locked shaft system and the vertical bead-locked shaft system all include pressure plates and bearing spacers, pressure plates are provided on both sides of the annular boss, and a bearing spacer is provided on the top of the annular boss, the two pressure plates are connected by screws, and the screws pass through the bearing spacer, and the two pressure plates act on the first rolling support part, the second rolling support part and the third rolling support part to achieve axial locking of the bearing.

[0018] Further optimization, the vertical bead-closed shaft system also includes a bearing retaining ring, the bearing partition on the lower side of the annular boss of the vertical bead-closed shaft system is a sleeve, the bearing retaining ring is located at the bottom of the third rolling support part and the sleeve of the vertical bead-closed shaft system, and the bearing retaining ring is used to prevent the third rolling support part from falling off.

[0019] Further optimization includes a connecting plate, wherein the horizontal left bead-shaped shaft system and the horizontal right bead-shaped shaft system both pass through the connecting plate and the top of the vertical bead-shaped shaft system, and the connecting plate is provided with an inner hole, and the inner hole of the connecting plate and the top journal of the bearing of the vertical bead-shaped shaft system are interference fit.

[0020] Further optimization, in order to significantly reduce the overall weight of the device and facilitate its miniaturization and portability, is set as follows: except for the bearing, the first rolling support part, the second rolling support part and the third rolling support part, the remaining materials are all made of aluminum alloy.

[0021] The present invention has the following beneficial effects:

[0022] This solution provides a high-precision orthogonal rotary axis system based on a dense ball bearing. Based on the error averaging effect of the dense ball bearing and the step shape of the bearing, the shaft system accuracy can be improved and the difficulty of shaft system processing and manufacturing can be reduced. In addition, the step shape of the bearing is conducive to reducing the impact of thermal deformation on the shaft system accuracy. At the same time, the overall structure of the high-precision orthogonal rotary axis system is compact and made of aluminum alloy, which is conducive to the miniaturization and portability of precision measuring instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A stereoscopic diagram of a high-precision orthogonal rotary axis system based on a dense ball bearing provided by the present invention;

[0024] Figure 2 A schematic structural diagram of a high-precision orthogonal rotary axis system based on a ball bearing provided by the present invention;

[0025] Figure 3 A stereoscopic diagram of another embodiment of a high-precision orthogonal rotary axis system based on a ball bearing provided by the present invention.

[0026] The reference numbers in the figure are: 1-horizontal left dense bead shaft system, 2-horizontal right dense bead shaft system, 3-vertical dense bead shaft system, 4-bearing seat, 5-first encoder, 6-first mounting plate, 7-bearing, 8-second encoder, 9-first rolling support part, 10-second rolling support part, 11-third rolling support part, 12-second mounting plate, 13-third mounting plate, 14-fourth mounting plate, 15-first motor, 16-second motor, 17-pressure plate, 18-bearing spacer, 19-bearing retaining ring, 20-connecting plate, 21-laser measurement module, 22-laser tracker, 23-target ball. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with embodiments.

[0028] Embodiment 1: Figure 1 A stereoscopic diagram of a high-precision orthogonal rotary axis system based on a dense ball bearing provided by the present invention; Figure 2 A schematic structural diagram of a high-precision orthogonal rotary axis system based on a ball bearing provided by the present invention; Figure 1 and Figure 2 As shown, the horizontal left dense bead shaft system 1 includes a bearing seat 4, a first encoder 5, a first mounting plate 6, a bearing 7, a pressure plate 17, a first rolling support part 9, a bearing partition 18, a second rolling support part 10, and a third rolling support part 11. Among them, the first rolling support part 9, the second rolling support part 10 and the third rolling support part 11 all adopt dense bead bearings, wherein the right side pressure plate 17 of the annular boss is installed in the hole of the bearing seat 4 through clearance fit and shoulder positioning, and is fixed on the bearing seat 4 through four screws, and the bearing 7 is installed on the right side pressure plate 17 through the first rolling support part 9, the bearing partition 18, the second rolling support part 10, and the third rolling support part 11, and the axial locking of the bearing 7 is realized through the pressure plate 17 on the right side of the annular boss. The bearing partition 18 is used for the support between the pressure plates 17 on both sides of the annular boss and the interference adjustment when the dense bead bearing is installed. The left side pressure plate 17 of the annular boss passes through the bearing partition 18 through four screws and is connected to the right side pressure plate 17 of the annular boss. The first mounting plate 6 is provided with an inner hole, and the inner hole of the first mounting plate 6 is installed on the journal of the bearing 7 through a clearance fit, and axial locking is achieved through a shoulder, and it is installed on the bearing 7 through four screws. The first encoder 5 is installed on the first mounting plate 6 through four screws, and is used to measure the pitch angle during rotation. The bearing seat 4 is positioned through two pin holes and is installed on the left side of the connecting plate 20 with four screws. The inner hole of the connecting plate 20 is an interference fit with the journal of the bearing 7 in the vertical beaded shaft system 3, and is connected to the vertical beaded shaft system 33 through screws.

[0029] In this embodiment, the horizontal right bead-type shaft system 2 includes a bearing seat 4, a bearing 7, a pressure plate 17, a first rolling support part 9, a bearing partition 18, a second rolling support part 10, a third rolling support part 11, a first motor 15, and a third mounting plate 13. The first rolling support part 9, the second rolling support part 10, and the third rolling support part 11 all use bead-type bearings, wherein the left pressure plate 17 of the annular boss is installed in the hole of the bearing seat 4 through clearance fit and shoulder positioning, and is fixed to the bearing seat 4 through four screws. The bearing 7 is installed on the right pressure plate 17 through the first rolling support part 9, the bearing partition 18, the second rolling support part 10, and the third rolling support part 11, and the axial locking of the bearing 7 is achieved through the pressure plate 17 on the left side of the annular boss. The bearing partition 18 is used for the support between the pressure plates 17 on both sides of the annular boss and the interference adjustment when the bead-type bearing is installed. The right pressure plate 17 of the annular boss passes through the bearing partition 18 through four screws and is connected to the left pressure plate 17 of the annular boss. The first mounting plate 6 is provided with an inner hole, and the inner hole of the first mounting plate 6 is installed on the journal of the bearing 7 through a clearance fit, and axial locking is achieved through a shoulder, and it is installed on the bearing 7 through four screws. The first motor 15 is installed on the third mounting plate 13 through four screws to achieve the rotation of the bearing 7 around itself. The bearing seat 4 is positioned through two pin holes and is installed on the right side of the connecting plate 20 with four screws. The inner hole of the connecting plate 20 is an interference fit with the journal of the bearing 7 in the vertical beaded shaft system 3, and the connection with the vertical beaded shaft system 3 is achieved through screws.

[0030] In this embodiment, the vertical bead-type shaft system 3 includes a bearing seat 4, a bearing 7, a pressure plate 17, a first rolling support part 9, a bearing partition 18, a second rolling support part 10, a third rolling support part 11, a bearing retaining ring 19, a second motor 16, a fourth mounting plate 14, a second encoder 8 and a second mounting plate 12. The first rolling support part 9, the second rolling support part 10 and the third rolling support part 11 all adopt bead-type bearings, and the lower side pressure plate 17 of the annular boss adopts a sleeve; the journal of the bearing 7 is interference fit with the inner hole of the bearing seat 4, and is fixedly mounted on the bearing seat 4 by screws. The bearing 7 is mounted on the sleeve through the first rolling support part 9, the second rolling support part 10, the third rolling support part 11 and the bearing partition 18, and the axial locking of the vertical bead-type shaft system 3 is realized through the upper bearing 7 pressure plate 17. The bearing partition 18 is used for the support between the upper bearing 7 pressure plate 17 and the sleeve and the interference adjustment when the axial bead-type bearing is installed. The upper bearing 7 pressure plate 17 passes through the bearing partition plate 18 and is connected to the sleeve through four screws. The bearing retaining ring 19 is installed on the bearing seat 4 through four screws to prevent the bead-type bearing from falling off during rotation. The second motor 16 is installed on the shaft neck at the bottom of the bearing 7 through an interference fit, contacts the end face of the vertical bead-type shaft system 3, and realizes the axial locking of the second motor 16 through the fourth mounting plate 14, and realizes the rotation of the bearing 7 around itself. The inner hole of the third mounting plate 13 is matched with the shaft neck of the bearing 7, and is installed on the vertical bead-type shaft system 3 through four screws. The second encoder 8 is installed on the third mounting plate 13 and the bearing seat 4 by screws, and is used to measure the azimuth angle during rotation.

[0031] In this embodiment, the axes of the horizontal left bead-shaped axis system 1 and the horizontal right bead-shaped axis system 2 are coaxial and perpendicular to the axis of the vertical bead-shaped axis system 3, and intersect at one point, which serves as the origin of the orthogonal rotating axis system.

[0032] In this embodiment, the horizontal left dense bead shaft system 1, the horizontal right dense bead shaft system 2 and the vertical dense bead shaft system 3 all use high-precision dense bead bearings, the selected dense bead bearings have a ball diameter of 6mm and 4mm, the particle difference is less than 0.1μm, and the roundness error is less than 0.05μm. During the assembly process, the dense bead bearings have a certain interference, and the interference is 3-6μm. The error averaging effect is used to improve the accuracy of the shaft system. After manufacturing and assembly, the rotation accuracy of the shaft system is better than 1μm. At the same time, the balls in the dense bead bearings are staggered and the raceways do not overlap, which reduces the wear of the shaft system and improves the rigidity of the shaft system.

[0033] In this embodiment, the bearings 7 in the horizontal left bead-like shaft system 1, the horizontal right bead-like shaft system 2 and the vertical bead-like shaft system 3 are all stepped, and radial fixation is achieved by a radial bead-like shaft system, and axial fixation is achieved by a pair of axial bead-like shaft system. When the rotary shaft system moves, the vertical shaft system undergoes thermal elongation due to the influence of temperature. Since the upper part of the vertical bead-like shaft system 3 is fixed, the influence of temperature on the horizontal bead-like shaft system can be avoided. The left end of the horizontal left bead-like shaft system 1 is fixed, and the right end of the horizontal right bead-like shaft system 2 is fixed. Therefore, due to the temperature, the horizontal left bead-like shaft system 1 can only elongate to the right end, while the horizontal right bead-like shaft system 2 can only elongate to the left end. The horizontal left bead-like shaft system 1 and the horizontal right bead-like shaft system 2 are symmetrical in structure, and thermal deformation can offset each other. Therefore, this structure is conducive to reducing the influence of thermal deformation on the accuracy of the shaft system.

[0034] Embodiment 2: Figure 3 A three-dimensional diagram of another embodiment of a high-precision orthogonal rotary axis system based on a dense ball bearing provided by the present invention; Figure 3 As shown, the laser tracker 22 composed of a high-precision orthogonal rotary axis system and a laser measurement module 21 records the pitch angle by rotating the horizontal axis, and records the azimuth angle by rotating the vertical axis. The laser measurement module 21 of the laser tracker 22 measures the distance from the target sphere 23, and establishes a spherical coordinate system with the intersection of the optical axis of the measurement module, the axis of the horizontal axis system, and the axis of the vertical axis system as the origin. The spatial position coordinates of the measured target sphere 23 can be accurately obtained by conversion with the Cartesian coordinate system. The design size of the laser tracker 22 is 450mm×Φ280mm, and the overall size is the smallest one among the current laser tracker 22 structures. Except for the high-precision ball bearing and the main shaft components using bearing 7 steel material, the remaining components are made of high-strength aluminum alloy, which can greatly reduce the overall weight of the tracker and facilitate its miniaturization and portability.

[0035] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision orthogonal rotary axis system based on a ball bearing, characterized in that , including a horizontal left dense bead axis system (1), a horizontal right dense bead axis system (2) and a vertical dense bead axis system (3); The horizontal left dense bead shaft system (1), the horizontal right dense bead shaft system (2) and the vertical dense bead shaft system (3) all comprise a bearing seat (4), a bearing (7), a first rolling support part (9), a second rolling support part (10) and a third rolling support part (11); the bearing (7) is installed in the bearing hole of the bearing seat (4); the bearing (7) is step-shaped; an annular boss is provided in the middle of the side surface of the bearing (7); a first rolling support part (9) is provided on one side of the annular boss; a second rolling support part (10) is provided on the other side of the annular boss; a third rolling support part (11) is provided on the side surface of the small shaft diameter and / or the large shaft diameter of the bearing (7); the bearing (7) can rotate around its own axis; and a T-shaped structure is formed between each shaft end of the bearing (7) and the bearing (7); The horizontal left dense bead shaft system (1) and the horizontal right dense bead shaft system (2) are symmetrically arranged with a gap between them; the horizontal left dense bead shaft system (1) and the horizontal right dense bead shaft system (2) are both arranged on the top of the vertical dense bead shaft system (3); the axis of the bearing (7) of the vertical dense bead shaft system (3) is located between the horizontal left dense bead shaft system (1) and the horizontal right dense bead shaft system (2), and is perpendicular to the axis of the bearing (7) of the horizontal left dense bead shaft system (1); the small diameter ends of the bearings (7) of the horizontal left dense bead shaft system (1) and the horizontal right dense bead shaft system (2) are used to clamp the measuring module.

2. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 1, characterized in that The first rolling support part (9), the second rolling support part (10) and the third rolling support part (11) are all ball bearings.

3. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 1, characterized in that A first encoder (5) is provided at the large diameter end of the bearing (7) of the horizontal left bead-type shaft system (1), and a second encoder (8) is provided at the bottom of the bearing (7) of the vertical bead-type shaft system (3). Both the first encoder (5) and the second encoder (8) are used to measure angles during rotation.

4. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 3, characterized in that The horizontal left-beaded shaft system (1) further includes a first mounting plate (6), the first encoder (5) is connected to the shaft neck of the large shaft diameter end of the bearing (7) through the first mounting plate (6), the first mounting plate (6) is provided with an inner hole, and the inner hole of the first mounting plate (6) and the shaft neck of the large shaft diameter end of the bearing (7) are clearance-matched; The vertical bead-type shaft system (3) further comprises a second mounting plate (12), the second encoder (8) being connected to the shaft neck at the bottom of the bearing (7) via the second mounting plate (12), the second mounting plate (12) being provided with an inner hole, and a clearance fit between the inner hole of the second mounting plate (12) and the shaft neck at the bottom of the bearing (7).

5. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 1, characterized in that The horizontal right bead-joint shaft system (2) is provided with a first motor (15), and the vertical bead-joint shaft system (3) is provided with a second motor (16). The first motor (15) is used to drive the bearings (7) of the horizontal left bead-joint shaft system (1) and the horizontal right bead-joint shaft system (2) to rotate, and the second motor (16) is used to drive the bearings (7) of the vertical bead-joint shaft system (3) to rotate.

6. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 5, characterized in that The horizontal right bead-type shaft system (2) further comprises a third mounting plate (13), the first motor (15) is connected to the bearing (7) via the third mounting plate (13), an inner hole is provided on the third mounting plate (13), and a clearance fit is formed between the inner hole of the third mounting plate (13) and the journal at the large shaft diameter end of the bearing (7); The vertical bead-type shaft system (3) further comprises a fourth mounting plate (14), the second motor (16) is connected to the bearing (7) via the fourth mounting plate (14), the fourth mounting plate (14) is located at the lower end of the second motor (16), and an interference fit is formed between the fourth mounting plate (14) and the bottom journal of the bearing (7).

7. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 1, characterized in that The horizontal left bead-shaped shaft system (1), the horizontal right bead-shaped shaft system (2) and the vertical bead-shaped shaft system (3) all further include a pressure plate (17) and a bearing partition plate (18). Pressure plates (17) are provided on both sides of the annular boss, and a bearing partition plate (18) is provided on the top of the annular boss. The two pressure plates (17) are connected by screws, and the screws pass through the bearing partition plate (18). The two pressure plates (17) act on the first rolling support part (9), the second rolling support part (10) and the third rolling support part (11) to achieve axial locking of the bearing (7).

8. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 7, characterized in that The vertical bead-like shaft system (3) further comprises a bearing retaining ring (19), the bearing partition (18) on the lower side of the annular boss of the vertical bead-like shaft system (3) is a shaft sleeve, the bearing retaining ring (19) is located at the bottom of the third rolling support part (11) and the shaft sleeve of the vertical bead-like shaft system (3), and the bearing retaining ring (19) is used to prevent the third rolling support part (11) from falling off.

9. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 1, characterized in that , also includes a connecting plate (20), the horizontal left bead-shaped shaft system (1) and the horizontal right bead-shaped shaft system (2) both pass through the connecting plate (20) and the top of the vertical bead-shaped shaft system (3), the connecting plate (20) is provided with an inner hole, and the inner hole of the connecting plate (20) and the top journal of the bearing (7) of the vertical bead-shaped shaft system (3) are interference fit.

10. A high-precision orthogonal rotary axis system based on a ball bearing according to claim 1, characterized in that Except for the bearing (7), the first rolling support part (9), the second rolling support part (10) and the third rolling support part (11), the remaining materials are all made of aluminum alloy.

Images