Precision structure composite ball hinge and parallel structure

Abstract

The present invention provides a composite ball hinge and parallel structure with a precise structure, which relates to the technical field of ball joints, in order to alleviate the technical problem that the three rotation axes of the existing ball hinge cannot intersect at one point. The composite ball hinge with a precise structure includes a first hinge fork, a second hinge fork, a cross shaft, an end cover, a rotating shaft and a bearing; the two ends of the cross shaft extend into the first bearing seat and are connected to the bearing, and the other two ends extend into the second bearing seat and are connected to the bearing; the rotating shaft extends into the third bearing seat and is connected to the bearing; end covers are installed on the outer sides of the first bearing seat and the second bearing seat, and gaps are provided between the end cover and the first bearing seat, and between the end cover and the second bearing seat. The parallel structure includes the composite ball hinge with a precise structure as described above. The present invention can adjust the gap between the end cover and the first bearing seat, and the gap between the end cover and the second bearing seat to make the three rotation axes intersect at one point.

Description

Technical Field

[0001] The invention relates to the technical field of ball joints, and in particular to a composite ball hinge and a parallel structure with a precise structure. Background Art

[0002] In recent years, the advantages of parallel robots and stewart platforms have gradually been valued. The advantages of parallel structures such as no cumulative error, high precision, light weight of moving parts, high speed, and good dynamic response are increasingly attracting people's attention.

[0003] "Hinge" is an important mechanical structure of the parallel mechanism. The accuracy, load-bearing capacity and range of motion of the hinge directly determine the accuracy, load-bearing capacity and range of motion of the parallel mechanism. Therefore, the research and manufacturing of the accuracy, load-bearing capacity and range of motion of the hinge are in urgent need of development.

[0004] Figure 1 The traditional ball hinge, as a revolving pair with three degrees of freedom, can perform three degrees of freedom of rotation around the center of the ball, and the three rotation axes are perpendicular to each other. In theory, the three rotation axes of the traditional ball hinge should intersect at one point, but the three rotation axes of the traditional hinge cannot intersect at one point due to processing and manufacturing errors, and the mechanical structure uses ball bearings, which cannot be adjusted to make the rotation axes intersect at one point. Summary of the invention

[0005] The purpose of the present invention is to provide a composite ball hinge and parallel structure with a precise structure to alleviate the technical problem that the three rotation axes of the existing ball hinge cannot intersect at one point.

[0006] The present invention provides a composite ball hinge with a precise structure, comprising a first hinge fork, a second hinge fork, a cross shaft, an end cover, a rotating shaft and a bearing;

[0007] The first hinge fork has two first bearing seats arranged in parallel, and the bearings are installed in both of the two first bearing seats;

[0008] The second hinge fork has two second bearing seats arranged in parallel, a third bearing seat is arranged at the bottom, and the bearings are installed in the third bearing seat and the two second bearing seats;

[0009] Two opposite ends of the cross shaft extend into the first bearing seat and are connected to the bearing, and the other two opposite ends extend into the second bearing seat and are connected to the bearing; one end of the rotating shaft extends into the third bearing seat and is connected to the bearing;

[0010] The end cover is installed on the outer side of each of the first bearing seats and each of the second bearing seats, and a gap is provided between the end cover and the first bearing seat, and between the end cover and the second bearing seat.

[0011] Furthermore, it also includes an inner cover, and the inner side of the first bearing seat and the inner side of the second bearing seat are both provided with the inner cover to block the inner port of the first bearing seat and the inner port of the second bearing seat;

[0012] The end of the cross shaft passes through the inner cover and is connected to the bearing.

[0013] Furthermore, it also includes a cover, which is connected to the rotating shaft and is located at the inner port of the third bearing seat, and is used to cover the inner port of the third bearing seat.

[0014] Further, the rotating shaft includes a mounting section and a bearing section;

[0015] The mounting section extends into the third bearing seat and is connected to the inner ring of the bearing;

[0016] The bearing section is connected to the end of the mounting section away from the cross shaft, abuts against the inner ring end surface of the bearing, and blocks the outer port of the third bearing seat.

[0017] Furthermore, the inner wall of the third bearing seat has an annular boss, the two bearings are respectively located on both sides of the annular boss, and the annular boss abuts against the outer ring end surfaces of the two bearings;

[0018] The bearing section abuts against the inner ring end surface of the bearing below the annular boss, and the cover abuts against the inner ring end surface of the bearing above the annular boss.

[0019] Furthermore, the rotating shaft further comprises a threaded section and a nut, wherein the threaded section is connected to the end of the mounting section facing the cross shaft and passes through the cover;

[0020] The nut is mounted on the threaded section, and the nut and the end of the mounting section facing the cross shaft clamp the cover.

[0021] Further, the cover includes a first abutment portion and a first shielding portion;

[0022] The first shielding portion is connected to the rotating shaft, and an outer edge of the first shielding portion is close to an inner wall of the third bearing seat;

[0023] The first abutment portion is disposed on a side of the shielding portion facing the bearing and abuts against an inner ring end surface of the bearing.

[0024] Further, the bearing section includes a second abutting portion and a second shielding portion;

[0025] The second shielding portion is connected to the end of the mounting section away from the cross axis, and the outer edge of the second shielding portion is close to the inner wall of the third bearing seat;

[0026] The second abutting portion is disposed on a side of the second shielding portion facing the bearing and abuts against an inner ring end surface of the bearing.

[0027] Furthermore, a threaded hole is provided at the end of the rotating shaft away from the cross shaft along the axial direction of the rotating shaft.

[0028] A parallel structure includes the composite ball hinge with the above-mentioned precision structure.

[0029] The cross shaft of the composite ball hinge of the precision structure provided by the present invention has two rotation axes, the first hinge fork can rotate around one rotation axis of the cross shaft, the second hinge fork can rotate around the other rotation axis of the cross shaft, and the two rotation axes of the cross shaft intersect at one point. The end of the end cover extending into the first bearing seat and the second bearing seat abuts against the bearing, and a gap is provided between the end cover and the first bearing seat, and between the end cover and the second bearing seat, and the extension length of the end cover in the first bearing seat and the second bearing seat is achieved by adjusting the size of the gap. Adjusting the gap between the end cover and the first bearing seat can enable the cross shaft to move in the direction of one of its own rotation axes, and adjusting the gap between the end cover and the second bearing seat can enable the cross shaft to move in the direction of another rotation axis of the cross shaft until the rotation axis of the shaft passes through the intersection of the two rotation axes of the cross shaft. The composite ball hinge of the precision structure achieves the intersection of the three rotation axes at one point by adjusting the gap between the end cover and the first bearing seat and the gap between the end cover and the second bearing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the structure of a traditional ball hinge;

[0032] Figure 2 A schematic diagram of the structure of a composite ball hinge with a precise structure provided by an embodiment of the present invention;

[0033] Figure 3 A front view of a composite ball hinge with a precise structure provided by an embodiment of the present invention;

[0034] Figure 4 For along Figure 3 Sectional view of the A-A plane;

[0035] Figure 5 for Figure 4 A partial schematic diagram of the middle B area;

[0036] Figure 6 for Figure 4 A partial schematic diagram of the middle C area;

[0037] Figure 7 A schematic diagram of the structure of a rotating shaft provided in an embodiment of the present invention;

[0038] Figure 8 A schematic diagram of the structure of a cross axis provided in an embodiment of the present invention.

[0039] Icons: 1-first hinge fork; 11-first bearing seat; 2-second hinge fork; 21-second bearing seat; 22-third bearing seat; 221-annular boss; 3-cross shaft; 4-rotating shaft; 41-installation section; 42-bearing section; 421-second abutment portion; 422-second shielding portion; 43-threaded section; 44-nut; 45-threaded hole; 5-bearing; 6-end cover; 7-inner cover; 8-cover; 81-first abutment portion; 82-first shielding portion. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The following describes the first and second embodiments in detail with reference to the accompanying drawings:

[0044] Embodiment 1

[0045] This embodiment provides a composite ball hinge with a precise structure. Please refer to the attached drawings in the specification. Figures 2 to 8 .

[0046] See also Figures 1 to 3 The composite ball hinge with a precision structure comprises a first hinge fork 1, a second hinge fork 2, a cross shaft 3, an end cover 6, a rotating shaft 4 and a bearing 5; the first hinge fork 1 has two first bearing seats 11 arranged in parallel, and the two first bearing seats 11 are both equipped with bearings 5; the second hinge fork 2 has two second bearing seats 21 arranged in parallel, a third bearing seat 22 is arranged at the bottom, and the third bearing seat 22 and the two second bearing seats 21 are both equipped with bearings 5; two opposite ends of the cross shaft 3 extend into the first bearing seat 11 and are connected to the bearing 5, and the other two opposite ends extend into the second bearing seat 21 and are connected to the bearing 5; one end of the rotating shaft 4 extends into the third bearing seat 22 and is connected to the bearing 5; an end cover 6 is installed on the outer side of each first bearing seat 11 and each second bearing seat 21, and a gap is arranged between the end cover 6 and the first bearing seat 11, and between the end cover 6 and the second bearing seat 21.

[0047] The bearing 5 in the composite ball hinge of the precision structure is preferably an angular contact ball bearing, which is installed in the two first bearing seats 11 and is arranged in a back-to-back manner, and the angular contact ball bearings installed in the two second bearing seats 21 are also arranged in a back-to-back manner, so that after the position adjustment of the cross shaft 3 is completed, the movement of the cross shaft 3 along its two rotation axes is restricted. Of course, the bearing 5 in the composite ball hinge of the precision structure can also be other types, such as deep groove ball bearings, tapered roller bearings, etc.

[0048] like Figure 8As shown, the cross shaft 3 of the composite ball hinge of the precision structure has two rotation axes, the first hinge fork 1 can rotate around one rotation axis of the cross shaft 3, and the second hinge fork 2 can rotate around the other rotation axis of the cross shaft 3, and the two rotation axes of the cross shaft 3 intersect at one point. The end of the end cover 6 extending into the first bearing seat 11 and the second bearing seat 21 abuts against the bearing 5, and there is a gap between the end cover 6 and the first bearing seat 11, and between the end cover 6 and the second bearing seat 21. The extension length of the end cover 6 in the first bearing seat 11 and the second bearing seat 21 is achieved by adjusting the size of the gap. Adjusting the gap between the end cover 6 and the first bearing seat 11 can enable the cross shaft 3 to move in the direction of one of its own rotation axes, and adjusting the gap between the end cover 6 and the second bearing seat 21 can enable the cross shaft 3 to move in the direction of another rotation axis of itself, until the rotation axis of the shaft 4 passes through the intersection of the two rotation axes of the cross shaft 3. The composite ball hinge of the precision structure realizes the intersection of three rotation axes at one point by adjusting the gap between the end cover 6 and the first bearing seat 11 and the gap between the end cover 6 and the second bearing seat 21 .

[0049] Specifically, Figures 1 to 3 As shown, bolts are used to connect the end cover 6 to the first bearing seat 11, and the end cover 6 to the second bearing seat 21. Figure 3 Taking the left adjustment of the cross shaft 3 of the composite ball hinge with medium precision structure as an example, loosen the bolts on the left first bearing seat 11, increase the gap between the left end cover 6 and the left first bearing seat 11, and reduce the gap between the right end cover 6 and the right first bearing seat 11, so that the right end cover 6 pushes the bearing 5 in the right first bearing seat 11 to move left, and then the cross shaft 3 and the bearing 5 in the left first bearing seat 11 move left, when the rotation axis of the cross shaft 3 passing through the two second bearing seats 21 intersects with the rotation axis of the rotating shaft 4, move the left end cover 6 so that the left end cover 6 is against the bearing 5 in the left first bearing seat 11, and then tighten all bolts on the two first bearing seats 11. Figure 3 The operation process of the composite ball hinge with a precise structure to move right, forward and backward is similar to that to move left.

[0050] The end cover 6 arranged on the outer side of the first bearing seat 11 and the outer side of the second bearing seat 21 can effectively cover the outer port of the first bearing seat 11 and the outer port of the second bearing seat 21, preventing dust and foreign matter from entering the first bearing seat 11 from the outer port of the first bearing seat 11 or entering the second bearing seat 21 from the outer port of the second bearing seat 21.

[0051] See also Figure 1 and Figure 3The precision structured composite ball hinge also includes an inner cover 7. The inner sides of the first bearing seat 11 and the second bearing seat 21 are both provided with inner covers 7 to shield the inner ports of the first bearing seat 11 and the second bearing seat 21; the end of the cross shaft 3 passes through the inner cover 7 and is connected to the bearing 5.

[0052] The inner cover 7 can shield the inner port of the first bearing seat 11 and the inner port of the second bearing seat 21, preventing external dust and foreign matter from entering through the inner port of the first bearing seat 11 or the inner port of the second bearing seat 21, thereby ensuring the cleanliness of the working environment of the bearing 5, extending the service life of the bearing 5, and keeping the composite ball hinge stable during rotation.

[0053] Specifically, see Figure 3 , use bolts to connect the inner cover 7 to the inner side of the first bearing seat 11, and to connect the inner cover 7 to the inner side of the second bearing seat 21.

[0054] See also Figure 3 The composite ball hinge with a precision structure also includes a cover 8, which is connected to the rotating shaft 4 and is located at the inner port of the third bearing seat 22 for shielding the inner port of the third bearing seat 22.

[0055] The cover 8 blocks the inner port of the third bearing seat 22 , which can prevent dust and foreign matter from entering the third bearing seat 22 from the inner port of the third bearing seat 22 , thereby ensuring that the working environment of the bearing 5 located in the third bearing seat 22 is clean and extending the service life of the bearing 5 .

[0056] See also Figure 4 and Figure 7 When the bearing 5 is installed in the third bearing seat 22, the outer ring of the bearing 5 cooperates with the inner wall of the third bearing seat 22; the rotating shaft 4 includes a mounting section 41 and a bearing section 42; the mounting section 41 extends into the third bearing seat 22 and is connected to the inner ring of the bearing 5; the bearing section 42 is connected to the end of the mounting section away from the cross shaft 3, abuts against the inner ring end face of the bearing 5, and blocks the outer port of the third bearing seat 22.

[0057] The mounting section 41 is rotatably connected to the third bearing seat 22 through the bearing 5. The bearing section 42 can abut against the end face of the inner ring of the bearing 5 on the one hand, and can shield the outer port of the third bearing seat 22 on the other hand, preventing dust and foreign matter from entering the third bearing seat 22 from the outer port of the third bearing 5, further ensuring that the working environment of the bearing 5 located in the third bearing seat 22 is clean.

[0058] See also Figure 4The inner wall of the third bearing seat 22 has an annular boss 221, and the two bearings 5 ​​are respectively located on both sides of the annular boss 221, and the annular boss 221 abuts against the outer ring end faces of the two bearings 5; the bearing section 42 abuts against the inner ring end face of the bearing 5 below the annular boss 221, and the cover 8 abuts against the inner ring end face of the bearing 5 above the annular boss 221.

[0059] The annular boss 221 abuts against the outer ring end face of the bearing 5 below, and the bearing section 42 abuts against the inner ring end face of the bearing 5 below the annular boss 221. The bearing 5 located between the annular boss 221 and the bearing section 42 is clamped to prevent the bearing 5 between the annular boss 221 and the bearing section 42 from moving axially of the rotating shaft 4 during operation.

[0060] The annular boss 221 abuts against the outer ring end face of the upper bearing 5, and the cover 8 abuts against the inner ring end face of the bearing 5 above the annular boss 221. The bearing 5 located between the annular boss 221 and the cover 8 is clamped to prevent the bearing 5 between the annular boss 221 and the cover 8 from moving in the axial direction of the rotating shaft 4 during operation.

[0061] The two bearings 5 ​​in the third bearing seat 22 are preferably angular contact ball bearings, and the two angular contact ball bearings are arranged in back-to-back orientation to ensure that the axial position of the rotating shaft 4 is fixed. Of course, the third bearing seat 22 can also be other types, such as deep groove ball bearings, tapered roller bearings, etc.

[0062] See also Figure 4 and Figure 7 The rotating shaft 4 also includes a threaded section 43 and a nut 44. The threaded section 43 is connected to the end of the mounting section 41 facing the cross shaft 3 and passes through the cover 8. The nut 44 is installed on the threaded section 43. The nut 44 and the end of the mounting section 41 facing the cross shaft 3 clamp the cover 8.

[0063] Specifically, the major diameter of the external thread is smaller than the diameter of the mounting section 41 , and the nut 44 and the end of the mounting section 41 facing the cross shaft 3 clamp the cover 8 .

[0064] The cover 8 is connected to the rotating shaft 4 by the above structure, which facilitates the disassembly of the cover 8. When disassembling the cover 8, the nut 44 is disassembled, and the cover 8 can be removed from the threaded section 43. It is also convenient for the maintenance and repair of the bearing 5.

[0065] See also Figure 5 , Figure 5 for Figure 4 A partial enlarged view of area B in the middle shows that the cover 8 includes a first abutting portion 81 and a first shielding portion 82; the first shielding portion 82 is connected to the rotating shaft 4, and the outer edge of the first shielding portion 82 is close to the inner wall of the third bearing seat 22; the first abutting portion 81 is arranged on the side of the shielding portion facing the bearing 5, and abuts against the inner ring end face of the bearing 5.

[0066] The first shielding portion 82 of the cover 8 can shield the inner port of the third bearing 5 to prevent dust and foreign matter from entering the third bearing 5 from the inner port of the third bearing 5. The first abutting portion 81 abuts against the inner ring end face of the bearing 5 to clamp the bearing 5. At the same time, the first abutting portion 81 also isolates the first shielding portion 82 from the bearing 5 to prevent the first shielding portion 82 from interfering with the rotation of the bearing 5.

[0067] See also Figure 6 , Figure 6 for Figure 4 A partial enlarged view of the middle C area shows that the bearing section 42 includes a second abutment portion 421 and a second shielding portion 422; the second shielding portion 422 is connected to the end of the mounting section 41 that is away from the cross shaft 3, and the outer edge of the second shielding portion 422 is close to the inner wall of the third bearing seat 22; the second abutment portion 421 is arranged on the side of the second shielding portion 422 facing the bearing 5, and abuts against the inner ring end face of the bearing 5.

[0068] The second shielding portion 422 can shield the outer port of the third bearing 5 to prevent dust and foreign matter from entering the third bearing 5 from the outer port of the third bearing 5. The second abutting portion 421 abuts against the inner ring end face of the bearing 5 to clamp the bearing 5. At the same time, the second abutting portion 421 also isolates the second shielding portion 422 from the bearing 5 to prevent the second abutting portion 421 from interfering with the rotation of the bearing 5.

[0069] See also Figure 4 and Figure 7 The end of the rotating shaft 4 away from the cross shaft 3 is provided with a threaded hole 45 along the axial direction of the rotating shaft 4. The threaded hole 45 facilitates the connection of the rotating shaft 4 with other structures.

[0070] Embodiment 2

[0071] This embodiment provides a parallel structure, which includes the composite ball hinge with a precise structure provided in the first embodiment.

[0072] The composite ball hinge with a precise structure provided in the first embodiment can make the three rotation axes intersect at one point by adjusting the gap between the end cover 6 and the first bearing seat 11, and the gap between the end cover 6 and the second bearing seat 21. The parallel structure of the composite ball hinge with a precise structure in the first embodiment has higher precision and more stable movement.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite ball hinge with a precision structure, characterized in that: It comprises a first hinge fork (1), a second hinge fork (2), a cross shaft (3), an end cover (6), a rotating shaft (4) and a bearing (5); The first hinge fork (1) has two first bearing seats (11) arranged in parallel, and the bearings (5) are installed in both of the two first bearing seats (11); The second hinge fork (2) has two second bearing seats (21) arranged in parallel, a third bearing seat (22) is arranged at the bottom, and the bearing (5) is installed in the third bearing seat (22) and the two second bearing seats (21); Two opposite ends of the cross shaft (3) extend into the first bearing seat (11) to be connected to the bearing (5), and the other two opposite ends extend into the second bearing seat (21) to be connected to the bearing (5); one end of the rotating shaft (4) extends into the third bearing seat (22) to be connected to the bearing (5); The end cover (6) is installed on the outer side of each first bearing seat (11) and each second bearing seat (21); a gap is provided between the end cover (6) and the first bearing seat (11), and between the end cover (6) and the second bearing seat (21); by adjusting the gap between the end cover and the first bearing seat, the cross shaft can be moved in the direction of one of its own rotation axes; by adjusting the gap between the end cover and the second bearing seat, the cross shaft can be moved in the direction of another of its own rotation axes until the rotation axis of the shaft passes through the intersection of the two rotation axes of the cross shaft; It also includes an inner cover (7), wherein the inner side of the first bearing seat (11) and the inner side of the second bearing seat (21) are both provided with the inner cover (7) so as to cover the inner port of the first bearing seat (11) and the inner port of the second bearing seat (21); The end of the cross shaft (3) passes through the inner cover (7) and is connected to the bearing (5); It also includes a cover (8), which is connected to the rotating shaft (4) and is located at the inner port of the third bearing seat (22) and is used to cover the inner port of the third bearing seat (22); The rotating shaft (4) comprises a mounting section (41) and a bearing section (42); The mounting section (41) extends into the third bearing seat (22) and is connected to the inner ring of the bearing (5); The bearing section (42) is connected to the end of the mounting section (41) away from the cross shaft (3), abuts against the inner ring end surface of the bearing (5), and blocks the outer port of the third bearing seat (22); The inner wall of the third bearing seat (22) has an annular boss (221), the two bearings (5) are respectively located on both sides of the annular boss (221), and the annular boss (221) abuts against the outer ring end surfaces of the two bearings (5); The bearing section (42) abuts against the inner ring end surface of the bearing (5) below the annular boss (221), and the cover (8) abuts against the inner ring end surface of the bearing (5) above the annular boss (221).

2. The composite ball hinge with a precision structure according to claim 1 is characterized in that: The rotating shaft (4) further comprises a threaded section (43) and a nut (44); the threaded section (43) is connected to the end of the mounting section (41) facing the cross shaft (3) and passes through the cover (8); The nut (44) is mounted on the threaded section (43), and the nut (44) and the end of the mounting section (41) facing the cross shaft (3) clamp the cover (8).

3. The composite ball hinge with a precision structure according to claim 1 is characterized in that: The cover (8) comprises a first abutting portion (81) and a first blocking portion (82); The first shielding portion (82) is connected to the rotating shaft (4), and the outer edge of the first shielding portion (82) is close to the inner wall of the third bearing seat (22); The first abutment portion (81) is arranged on the side of the first shielding portion (82) facing the bearing (5), and abuts against the inner ring end surface of the bearing (5).

4. The composite ball hinge with a precision structure according to claim 1 is characterized in that: The bearing section (42) comprises a second abutting portion (421) and a second shielding portion (422); The second shielding portion (422) is connected to the end of the mounting section (41) away from the cross shaft (3), and the outer edge of the second shielding portion (422) is close to the inner wall of the third bearing seat (22); The second abutment portion (421) is arranged on the side of the second shielding portion (422) facing the bearing (5), and abuts against the inner ring end surface of the bearing (5).

5. The composite ball hinge with a precision structure according to claim 1 is characterized in that: A threaded hole (45) is provided at the end of the rotating shaft (4) away from the cross shaft (3) along the axial direction of the rotating shaft (4).

6. A parallel structure, characterized in that: A composite ball hinge comprising the precision structure as claimed in any one of claims 1 to 5.

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