Two-dimensional rotating flexible hinge

Abstract

The two-dimensional rotating flexible hinge comprises an upper connecting seat assembly, a middle connecting seat assembly and a lower connecting seat assembly which are distributed from top to bottom; a first reed group and a second reed group are arranged between the upper connecting seat assembly and the middle connecting seat assembly as well as between the middle connecting seat assembly and the lower connecting seat assembly, and the first reed group and the second reed group are arranged in a mirror image mode. According to the two-dimensional rotating flexible hinge, the reed set and the connecting base can be assembled without a tool, and microminiaturization can be achieved; the hinge is simple in structure and high in universality, connecting structures on the two sides are not limited, and different hinge performance can be achieved according to different reed geometric parameter design.

Description

Technical Field

[0001] The present invention relates to the field of precision machinery technology, and in particular to a two-dimensional rotating flexible hinge. Background Art

[0002] A flexible hinge refers to a mechanical connection device that achieves specific movement through the elastic deformation of the material. Compared with traditional hinges that rely on revolving pairs, flexible hinges have the advantages of no lubrication, no wear, zero backlash, and long life. Typical application scenarios include precision instruments, aerospace, micro-electromechanical systems, bionic robots, etc.

[0003] The notch-type flexible hinge and the spring-type flexible hinge are the two most common flexible hinge structures at present. Among them, the notch-type flexible hinge has a mature manufacturing process, but the range of motion is small, so it is often used as a stress-relieving flexible connection mechanism; the spring-type flexible hinge can achieve an ultra-large range of rotation, but requires a mirror-symmetrical arrangement to eliminate non-axial torsion, resulting in a relatively complex structure and manufacturing process, especially the micro flexible hinge is more difficult to manufacture.

[0004] Based on the above technical problems, technicians in this field urgently need to develop a two-dimensional rotating flexible hinge that can assemble the spring group and the connecting seat without tooling, can be miniaturized, and has high versatility. Summary of the Invention

[0005] The purpose of the present invention is to provide a two-dimensional rotating flexible hinge which can realize assembly of a spring group and a connecting seat without tooling, can be miniaturized, and has high versatility.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A two-dimensional rotating flexible hinge of the present invention comprises:

[0008] An upper connecting seat assembly, a middle connecting seat assembly and a lower connecting seat assembly are arranged from top to bottom;

[0009] A first reed group and a second reed group are provided between the upper connecting seat assembly and the middle connecting seat assembly, and between the middle connecting seat assembly and the lower connecting seat assembly. The first reed group and the second reed group are arranged as mirror images of each other, and both the first reed group and the second reed group have multiple glue-coated surfaces.

[0010] Furthermore, the upper connecting seat assembly includes an upper connecting seat, which is provided with a groove structure for accommodating the first reed group and the second reed group, and the groove structure has mating surfaces formed at both ends, and the mating surfaces have a glue storage groove;

[0011] Upper cover plates are provided at both ends of the mating surface.

[0012] Furthermore, the middle connecting seat assembly includes a middle connecting seat, which is a split structure with upper and lower parts, and has groove structures on the upper and lower parts for supporting the first spring group and the second spring group; and

[0013] A first middle cover plate provided at both ends of the upper portion of the middle connecting seat;

[0014] A second middle cover plate is provided at both ends of the lower portion of the middle connecting seat.

[0015] Furthermore, the lower connecting seat assembly includes a lower connecting seat, which is U-shaped and has groove structures symmetrically provided at both ends for supporting the first reed group and the second reed group;

[0016] Lower cover plates are provided at both ends of the groove of the lower connecting seat.

[0017] In the above technical solution, the present invention provides a two-dimensional rotating flexible hinge having the following characteristics:

[0018] Beneficial effects:

[0019] The two-dimensional rotating flexible hinge of the present invention can realize the assembly of the spring group and the connecting seat without tooling, and can achieve miniaturization; it has strong versatility, is not limited to the connection structure on both sides, and can achieve different hinge performances according to the design of different spring geometric parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 An assembly diagram of a two-dimensional rotating flexible hinge provided by an embodiment of the present invention;

[0022] Figure 2 An exploded view of a two-dimensional rotating flexible hinge provided by an embodiment of the present invention;

[0023] Figure 3 A diagram showing the positional relationship between two spring groups in a two-dimensional rotating flexible hinge provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of geometric parameters of a spring in a two-dimensional rotating flexible hinge provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of an upper connecting seat of a two-dimensional rotating flexible hinge provided by an embodiment of the present invention;

[0026] Figure 6 A two-dimensional rotating flexible hinge provided by an embodiment of the present invention Figure 5 Enlarged view of point A in the middle;

[0027] Figure 7 A schematic diagram of the first step of assembling a two-dimensional rotating flexible hinge according to an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the second step of assembling a two-dimensional rotating flexible hinge provided by an embodiment of the present invention;

[0029] Figure 9 A schematic diagram of the third step of assembling a two-dimensional rotating flexible hinge according to an embodiment of the present invention;

[0030] Figure 10 This is a diagram of the outer dimensions of a miniature two-dimensional rotating flexible hinge provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Upper connector; 2. First spring assembly; 3. Middle connector; 4. First middle cover; 5. Lower cover; 6. Lower connector; 7. Second middle cover; 8. Second spring assembly; 9. Upper cover.

[0033] 101. Mating surface; 102. Glue storage groove. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] See also Figures 1 to 9 As shown;

[0036] A two-dimensional rotating flexible hinge of the present invention comprises:

[0037] An upper connecting seat assembly, a middle connecting seat assembly and a lower connecting seat assembly are arranged from top to bottom;

[0038] A first reed group 2 and a second reed group 8 are provided between the upper connecting seat assembly and the middle connecting seat assembly, and between the middle connecting seat assembly and the lower connecting seat assembly. The first reed group 2 and the second reed group 8 are arranged as mirror images of each other, and both the first reed group 2 and the second reed group 8 have multiple glue-coated surfaces A.

[0039] As a further introduction to this embodiment, the upper connecting seat assembly includes an upper connecting seat 1, which is provided with a groove structure for accommodating the first reed group 2 and the second reed group 8, and the groove structure has mating surfaces 101 formed at both ends, and the mating surfaces 101 have a glue storage groove 102;

[0040] Upper cover plates 9 are provided at both ends of the mating surface 101 .

[0041] As a further introduction to this embodiment, the middle connecting seat assembly includes a middle connecting seat 3, which has a split structure at the top and bottom, and has groove structures at the top and bottom for supporting the first reed group 2 and the second reed group 8; and

[0042] A first middle cover plate 4 is provided at both ends of the upper portion of the middle connecting seat 3;

[0043] A second middle cover plate 7 is provided at both ends of the lower portion of the middle connecting seat 3 .

[0044] As a further introduction to this embodiment, the lower connecting seat assembly includes a lower connecting seat 6, which is U-shaped and has groove structures symmetrically provided at both ends for supporting the first reed group 2 and the second reed group 8;

[0045] The lower cover plates 5 are provided at both ends of the groove of the lower connecting seat 6 .

[0046] It should be noted that both the middle connecting seat 3 and the lower connecting seat have a groove structure, and are the same as the groove structure of the upper connecting seat 1 , and are provided with a mating surface and a glue storage groove.

[0047] In this embodiment, precision turning, milling and wire cutting are used to complete the production of all parts including the upper connecting seat 1, the middle connecting seat 3, the lower connecting seat 6, the first reed group 2 and the second reed group 8.

[0048] like Figure 3 As shown, the outer diameters of the first reed group 2 and the second reed group 8 are required (as shown in FIG. Figure 4 The error range of the inner diameter (shown as φD) is 0 to -0.003mm, and the error range of the inner diameter (reed length) is ±0.003mm. Figure 6 As shown, the diameter φD of the mating surface between the upper connector 1 and the first or second spring group 2, 8, must have an error range of +0.003mm to +0.006mm. A glue storage groove 102 (diameter D + 0.1mm) is provided on the mating surface, and a φ0.1mm hollow slot (also used for glue storage) is provided at the corner. The clearance error between the two marked side mating surfaces 101 and the first or second spring group 2, 8, must range from 0 to -0.003mm. The size requirements and structural form of the middle connector 3 and the lower connector 6 are the same as those of the upper connector 1. The first middle cover plate 4, the lower cover plate 5, and the second middle cover plate 7 serve as the fixing plates for the spring groups, further enhancing the reliability of the spring fixing.

[0049] The spring assembly material is selected according to the required hinge performance. Common materials include stainless steel, spring steel, titanium alloy, aluminum alloy, etc. Other connector materials and cover materials can be selected according to the load conditions.

[0050] The parameters that determine the performance of the two-dimensional rotational flexible hinge (mainly including torsional stiffness, load-bearing capacity and rotation angle range) include the thickness t, length d, width h, crossing angle α, and intersection position parameter λ of the spring, such as Figure 4 As shown, design analysis can be performed based on actual needs, and calculation methods can be found in public literature. Based on current processing capabilities, the smallest reed that can be produced is 3 mm long and 0.1 mm thick. Therefore, the two-dimensional rotational flexure hinge proposed in this paper can be miniaturized.

[0051] The two-dimensional rotating flexible hinge designed by the present invention does not require tooling and can be directly assembled according to the fit between the spring group and the connecting seat. If it is a miniature two-dimensional rotating flexible hinge (spring length is not greater than 5mm), the spring group and the upper connecting seat 1, the middle connecting seat 3, and the lower connecting seat 6 are fixed by gluing, and epoxy resin two-component adhesives with different performances are selected according to the operating temperature range and load conditions; the fixed cover plate and the spring group and the connecting seat (upper, middle, and lower) are also fixed by gluing. If it is not a miniature two-dimensional rotating flexible hinge (spring length is greater than 5mm) and the geometric dimensions allow, the spring group and the connecting seat, and the fixed cover plate and the spring and the connecting seat can also be fixed with screws or a combination of gluing and screws.

[0052] To eliminate torsion in non-moving directions during hinge operation, the first and second leaf spring groups 2, 8 must be arranged in mirror-image symmetry. A two-dimensional rotating flexible hinge can have one or more first and second leaf spring groups 2, 8 on each axis, but they must be equal in number and arranged in mirror-image symmetry. To prevent interference between leaf springs within the first or second leaf spring group 2, 8, during movement, a gap δ should be maintained between the leaf springs, typically 0.1 to 0.2 mm. The upper and lower connecting bases 1, 6, can be modified to suit the specific connection structure.

[0053] According to the size and rotation load restrictions of the two-dimensional fast mirror, after design analysis and comprehensive consideration of the processing difficulty, the geometric parameters of the reed are obtained as thickness t = 0.12 mm, length d = 3.4 mm, width h = 1.9 mm, crossing angle α = 45°, intersection position parameter λ = 0.5, interval δ = 0.2 mm, and 12Cr13 stainless steel is selected as the material of the reed group.

[0054] Since the mirror body and mirror body support structure of the two-dimensional fast reflection mirror are made of SiC material and 4J36 Invar material (linear expansion coefficient of 2.3×10-6 / ℃), the upper connecting seat 1 is directly connected to the mirror body support structure. Therefore, the upper connecting seat 1 is also made of 4J36 Invar, so that when the temperature changes, the upper connecting seat 1 and the mirror body support structure are thermally matched and will not cause thermal stress deformation of the fast reflection mirror body. The remaining middle and lower connecting seats 6 and the cover plate are made of TC4 titanium alloy to ensure strength and rigidity while minimizing weight. Figure 10 As shown, the overall size of the two-dimensional rotational flexible hinge is 20.4mm×11.5mm×14.5mm, and the weight is 11g.

[0055] This embodiment provides a two-dimensional rotating flexible hinge, and the specific assembly process is as follows:

[0056] The first step, such as Figure 7 As shown, apply glue on the mounting surfaces of the first reed group 2 and the second reed group 8 and the upper connecting seat 1, apply glue in the glue storage groove 102 of the upper connecting seat 1, push the first reed group 2 and the second reed group 8 into the upper connecting seat 1 from both sides in the direction of the arrow until the reed group is flush with the end surface of the upper connecting seat 1, and apply glue to the end surfaces of the upper cover plate 9 on both sides and fix them. Leave them in place until the glue is cured. Be sure to clean up the excess glue on the reeds in time.

[0057] The second part, such as Figure 8 As shown, apply glue on the mounting surface of the first reed group 2 and the second reed group 8 and the middle connecting seat 3, apply glue in the glue storage groove of the middle connecting seat 3, push the assembly completed in the first step of bonding from one side into the middle connecting seat 3 in the direction of the arrow until the reed group and the end surface of the middle connecting seat 3 are flush, and apply glue to the end surface of the second middle cover plate 7 on both sides and fix it. Leave it in place until the glue is cured. Be sure to clean up the excess glue on the reeds in time;

[0058] The third part, such as Figure 9 As shown, apply glue on the mounting surfaces of the first reed group 2 and the second reed group 8 and the middle connecting seat 3 and the lower connecting seat 6, apply glue in the glue storage grooves of the lower connecting seat 6 and the middle connecting seat 3, push the first reed group 2 and the second reed group 8 into the middle / lower connecting seat from both sides in the direction of the arrow until the reed group is flush with the end surface of the middle / lower connecting seat, and apply glue to the end surfaces of the first middle cover plate 4 and the lower cover plate 5 on both sides and fix them, place them in place until the glue solidifies, and pay attention to clean up the excess glue on the reeds in time.

[0059] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A two-dimensional rotating flexible hinge, characterized in that: The flexible hinge comprises: An upper connecting seat assembly, a middle connecting seat assembly and a lower connecting seat assembly are arranged from top to bottom; A first reed group (2) and a second reed group (8) are provided between the upper connecting seat assembly and the middle connecting seat assembly, and between the middle connecting seat assembly and the lower connecting seat assembly. The first reed group (2) and the second reed group (8) are arranged in a mirror image of each other, and both the first reed group (2) and the second reed group (8) have multiple glue-coated surfaces (A).

2. A two-dimensional rotation flexible hinge according to claim 1, characterized in that: The upper connecting seat assembly comprises an upper connecting seat (1) provided with a groove structure for accommodating the first spring group (2) and the second spring group (8), and the groove structure has mating surfaces (101) formed at both ends, and a glue storage groove (102) is formed in the mating surface (101); Upper cover plates (9) are provided at both ends of the mating surface (101).

3. The two-dimensional rotation flexible hinge according to claim 1, characterized in that: The middle connecting seat assembly comprises a middle connecting seat (3), the middle connecting seat (3) is a split structure with upper and lower parts, and both upper and lower parts are provided with groove structures for supporting the first spring group (2) and the second spring group (8); and A first middle cover plate (4) provided at both ends of the upper portion of the middle connecting seat (3); A second middle cover plate (7) is provided at both ends of the lower portion of the middle connecting seat (3).

4. The two-dimensional rotation flexible hinge according to claim 1, characterized in that: The lower connecting seat assembly includes a lower connecting seat (6) having a U-shaped structure and symmetrical groove structures at both ends, which is used to support the first reed group (2) and the second reed group (8); Lower cover plates (5) are provided at both ends of the groove of the lower connecting seat (6).

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