Limitable rotating piece

Abstract

The utility model discloses a limitable rotating piece which comprises a rotating outer disc, a limiting base, collision beads, a limiting piece and a rotating inner disc, the rotating outer disc is of a first hollow disc structure, and the first hollow disc structure comprises a wrapping part, a first containing part and a bearing part which are connected in sequence; the rotating inner disc is of a second hollow disc structure, the second hollow disc structure comprises a clamping part, a second containing part and a connecting part which are sequentially connected, a containing space with a circular section is formed between the first containing part and the second containing part, and a metal ball is arranged in the containing space; the limiting base is of a first circular structure, and a collision bead is arranged on the first circular structure; the limiting piece comprises a first inserting part, a limiting part and a second inserting part which are connected in sequence, the limiting part is of a second circular structure, a first limiting hole is formed in the second circular structure, and the first limiting hole is matched with the collision bead. According to the utility model, double functions of rotating and limiting can be realized, and the whole device is compact in structure.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and more specifically, to a rotatable component with a limit position. Background Technology

[0002] Wardrobes and storage cabinets are common furniture types used in homes and offices, typically for storing items. Most existing cabinets use hinged doors, with a hinged door at the front opening. For easier storage, some cabinets also use drawers, which can be pulled out or fully retracted into the cabinet's interior space. Rotating cabinets, however, are a uniquely designed and functional type of furniture. They use a rotating mechanism to store and retrieve items, and are widely used in home spaces such as kitchens, bedrooms, and living rooms. Currently, rotating cabinets only have a single rotating function and cannot be limited to a specific angle.

[0003] Chinese Patent Document 1 (Application No.: 202122132000.5, Application Date: 2021.09.06) provides a prefabricated cabinet structure, referring to... Figure 1 As shown, Figure 1 This is a schematic diagram of the prefabricated cabinet structure in Chinese Patent Document 1. The prefabricated cabinet structure includes a drawer cabinet body, which includes an upper cabinet 1' and a lower cabinet 2'. A first rotating connecting piece 3' is provided at the bottom of the upper cabinet 1'. A second rotating connecting piece 4' is provided on the surface of the lower cabinet 2' opposite to the first rotating connecting piece 3'. A rotation limiting ring 5' is provided between the first rotating connecting piece 3' and the second rotating connecting piece 4'. This solution can only rotate and cannot limit the movement, that is, this solution only has a single rotation function and cannot precisely limit the cabinet to a certain angle. Therefore, this is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] In view of this, the present invention provides a rotatable limiting component to solve the problem that the existing drawer cabinets have only a single rotation function and cannot precisely limit the cabinet body to a certain angle.

[0005] In a first aspect, this application provides a rotatable limiting component, comprising a rotating outer disk, a limiting base, a ball bearing, a limiting component, and a rotating inner disk. The rotating outer disk and the rotating inner disk are parallel, with the rotating outer disk located below the rotating inner disk. The rotating outer disk is a first hollow disk structure. Along the radial direction of the first hollow disk structure, the first hollow disk structure includes a covering portion, a first receiving portion, and a supporting portion connected in sequence. The orthographic projection of the covering portion, the first receiving portion, and the supporting portion along the direction from the rotating inner disk to the rotating outer disk is annular. The first hollow disk structure has a first hollow portion. The first receiving portion is recessed towards the side away from the rotating inner disk to form an arc. The surface, along the direction from the inner rotating disk to the outer rotating disk, the cross-sectional shape of the covering part is a C-shaped structure, with the opening of the C-shaped structure facing the first hollow part. The cross-sectional shape of the supporting part is rectangular. The first hollow part is opened in the middle of the supporting part, and the first hollow part penetrates the supporting part along the direction from the inner rotating disk to the outer rotating disk. The inner rotating disk is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a snap-fit ​​part, a second receiving part, and a connecting part connected in sequence. The orthographic projection of the snap-fit ​​part, the second receiving part, and the connecting part along the direction from the inner rotating disk to the outer rotating disk is all annular. The snap-fit ​​part and the covering part... Correspondingly, in the direction from the inner rotating disk to the outer rotating disk, the orthographic projection of the second receiving part completely overlaps with the orthographic projection of the first receiving part; it is engaged within the C-shaped structure through the opening of the C-shaped structure, and the second receiving part protrudes away from the outer rotating disk to form an arc surface. A second hollow part is provided on the connecting part, and the second hollow part penetrates the connecting part in the direction from the inner rotating disk to the outer rotating disk. A receiving space with a circular cross-section is formed between the first receiving part and the second receiving part, and a metal ball is placed in the receiving space; the limiting base is a first circular structure, which is connected to the side of the bearing part near the connecting part, and at least two ball bearings are provided on the first circular structure. At least two ball bearings are arranged along the circumference of the first circular structure, and the ball bearings pass through the first hollow part; the limiting member includes a first insertion part, a limiting part and a second insertion part connected in sequence, the limiting part is a second circular structure, the second circular structure has at least two first limiting holes, the at least two first limiting holes are arranged along the circumference of the second circular structure, the first limiting holes cooperate with the ball bearings, the first insertion part and the second insertion part are both inserted into the gap between the bearing part and the connecting part, the first insertion part and the second insertion part are respectively fixedly connected to their corresponding connecting parts, the connecting part rotates relative to the bearing part, and the ball bearings are embedded in the first limiting holes.

[0006] Secondly, this application provides an assembly method for a limit-positionable rotating cabinet, comprising:

[0007] The rotatable cabinet includes a first cabinet, at least one second cabinet, and a third cabinet. Each of the first, second, and third cabinets is a hollow rectangular body with an opening. Adjacent first and second cabinets, as well as second and third cabinets, are connected by rotatable components. Each rotatable component includes a rotating outer disk, a limiting base, a ball bearing, a limiting element, a rotating inner disk, and a sound-absorbing pad. The rotating outer disk and the rotating inner disk are parallel, with the outer disk located below the inner disk. The rotating outer disk is a first hollow disc structure. Along the radial direction of the first hollow disc structure, the first hollow disc structure includes a covering portion, a first receiving portion, and a supporting portion connected in sequence. The first receiving portion and the supporting portion are both annular in their orthographic projection along the direction from the inner rotating disk to the outer rotating disk. The first hollow disk structure has a first hollow portion. The first receiving portion is recessed away from the inner rotating disk to form an arc surface. Along the direction from the inner rotating disk to the outer rotating disk, the cross-sectional shape of the covering portion is a C-shaped structure, with the opening of the C-shaped structure facing the first hollow portion. The cross-sectional shape of the supporting portion is rectangular. The first hollow portion is provided in the middle of the supporting portion and penetrates the supporting portion along the direction from the inner rotating disk to the outer rotating disk. The inner rotating disk is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a snap-fit ​​portion, a second receiving portion, and a connecting portion connected in sequence. The first, second, and connecting portions are all annular in their orthographic projections along the direction from the inner rotating disk to the outer rotating disk. The snap-fit ​​portion corresponds to the covering portion, and along the direction from the inner rotating disk to the outer rotating disk, the orthographic projection of the second receiving portion completely overlaps with the orthographic projection of the first receiving portion. The snap-fit ​​portion, through an opening in a U-shaped structure, snaps into the U-shaped structure. The second receiving portion protrudes away from the outer rotating disk to form an arc surface. The connecting portion has a second hollow portion that penetrates the connecting portion along the direction from the inner rotating disk to the outer rotating disk. A circular receiving space is formed between the first and second receiving portions, and a metal ball is placed within this space. The limiting base is a first circular structure, which connects to the bearing portion near... On the side near the connecting part, at least two abutting beads are provided on the first circular structure. The at least two abutting beads are arranged along the circumference of the first circular structure and pass through the first hollow part. The limiting member includes a first insertion part, a limiting part and a second insertion part connected in sequence. The limiting part is a second circular structure. At least two first limiting holes are provided on the second circular structure. The at least two first limiting holes are arranged along the circumference of the second circular structure. The first limiting holes cooperate with the abutting beads. The first insertion part and the second insertion part are both inserted into the gap between the bearing part and the connecting part. The first insertion part and the second insertion part are respectively fixedly connected to their corresponding connecting parts. The connecting part rotates relative to the bearing part, and the abutting beads are embedded in the first limiting holes.A sound-absorbing pad is provided on the side of the limiting component away from the limiting base. The sound-absorbing pad is circular and points from the inner rotating disk to the outer rotating disk. The orthographic projection of the sound-absorbing pad completely overlaps with the orthographic projection of the second circular structure. A notch is provided on the edge of the circular pad, corresponding to the first limiting hole. The notch is U-shaped and recessed towards the center of the circular pad. The first cabinet, the second cabinet, and the third cabinet are arranged in the direction from the inner rotating disk to the outer rotating disk. A third cabinet and a first limiting rotating component are provided. The third cabinet includes a first top plate. A hole is drilled in the first top plate of the third cabinet to form a first top plate hole. The first top plate hole penetrates the first top plate in the direction from the first cabinet to the third cabinet. The first top plate hole corresponds to the ball bearing, the second bearing hole, and the first fastener in the first limiting rotating component. The third fastener connects the first top plate to the outer rotating disk in the first limiting rotating component through the first top plate hole. A second cabinet and a second limiting rotating component are provided. The second cabinet includes a second top plate and a first bottom plate arranged in parallel. A base plate is drilled to form a second top plate hole and a first bottom plate hole. Along the direction from the first cabinet to the third cabinet, the second top plate hole and the first bottom plate hole penetrate the second top plate and the first bottom plate, respectively. The first bottom plate hole corresponds to the connecting hole in the first rotatable component, and the second top plate hole corresponds to the ball bearing, the second bearing hole, and the first fastener in the second rotatable component. A third fastener threads the second top plate to the bearing part of the rotating outer disk in the second rotatable component through the second top plate hole. A first cabinet is provided, including a second bottom plate. A second bottom plate hole is drilled to form a second bottom plate hole. Along the direction from the third cabinet to the first cabinet, the second bottom plate hole penetrates the second bottom plate and corresponds to the connecting hole in the second rotatable component. A second fastener and a fourth fastener threads the first bottom plate to the connecting part of the rotating inner disk in the first rotatable component through the first bottom plate hole. The second bottom plate hole and the fourth fastener also threads the second bottom plate to the connecting part of the rotating inner disk in the second rotatable component through the second bottom plate hole.

[0008] Compared with the prior art, the rotatable component with limiting position provided by this utility model achieves at least the following beneficial effects:

[0009] The rotatable component provided by this utility model can realize the dual functions of rotation and limiting. For example, the structural design of the inner and outer rotating discs allows them to rotate relative to each other within the limiting range. The rotation angle is limited by the cooperation of the ball on the limiting base and the limiting hole on the limiting component. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0011] Figure 1This is a structural schematic diagram of the prefabricated cabinet structure in Chinese Patent Document 1;

[0012] Figure 2 This is a schematic diagram of the structure of a rotatable component that can be limited in one direction, provided by this utility model;

[0013] Figure 3 This is a schematic diagram of the structure of a rotatable limiting component from another direction provided by this utility model;

[0014] Figure 4 This is an exploded view of a rotatable component with limiting positioning provided by this utility model;

[0015] Figure 5 yes Figure 2 A cross-sectional view along line A-A' in one direction;

[0016] Figure 6 yes Figure 2 A cross-sectional view of A-A' from another direction;

[0017] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0018] Figure 8 This is a structural schematic diagram of a limiting component provided by this utility model;

[0019] Figure 9 This is a structural schematic diagram of a limiting base provided by this utility model;

[0020] Figure 10 This is a schematic diagram of the structure of a rotating outer disk provided by this utility model;

[0021] Figure 11 This is a schematic diagram of the structure of a rotating inner disk provided by this utility model;

[0022] Figure 12 This is a structural schematic diagram of a sound-absorbing pad provided by this utility model;

[0023] Figure 13 This is a flowchart illustrating an assembly method for a rotatable component with a limiting position provided by this utility model.

[0024] Figure 14 This is a simplified flowchart of an assembly method for a rotatable component with a limiting position provided by this utility model;

[0025] Figure 15 This is a structural schematic diagram of a limitable rotating cabinet provided by this utility model;

[0026] Figure 16 This is a schematic diagram of the rotational state structure of a limitable rotating cabinet provided by this utility model;

[0027] Figure 17 This is a flowchart illustrating an assembly method for a limitable rotating cabinet provided by this utility model;

[0028] Figure 18 This is a simplified flowchart of an assembly method for a rotatable component with a limiting position provided by this utility model. Detailed Implementation

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0030] Figures 2-11 As shown, Figure 2 This is a schematic diagram of the structure of a rotatable component that can be limited in one direction, provided by this utility model; Figure 3 This is a schematic diagram of the structure of a rotatable limiting component from another direction provided by this utility model; Figure 4 This is an exploded view of a rotatable component with limiting positioning provided by this utility model; Figure 5 yes Figure 2 A cross-sectional view along line A-A' in one direction; Figure 6 yes Figure 2 A cross-sectional view of A-A' from another direction; Figure 7 yes Figure 6 Enlarged view of point A in the middle; Figure 8 This is a structural schematic diagram of a limiting component provided by this utility model; Figure 9 This is a structural schematic diagram of a limiting base provided by this utility model; Figure 10 This is a schematic diagram of the structure of a rotating outer disk provided by this utility model; Figure 11This is a schematic diagram of the structure of a rotating inner disk provided by this utility model; this embodiment provides a rotatable limiting component 100, including a rotating outer disk 1, a limiting base 2, a ball bearing 3, a limiting component 5, and a rotating inner disk 4. The rotating outer disk 1 and the rotating inner disk 4 are parallel, and the rotating outer disk 1 is located below the rotating inner disk 4. The rotating outer disk 1 is a first hollow disk structure. Along the radial direction of the first hollow disk structure, the first hollow disk structure includes a covering part 10, a first receiving part 11, and a supporting part 12 connected in sequence. The orthographic projection of the covering part 10, the first receiving part 11, and the supporting part 12 along the direction from the rotating inner disk 4 to the rotating outer disk 1 is all annular. The first hollow disk structure has a first hollow part 120; the first receiving part 11 extends away from the rotating inner disk. 4. One side is concave to form an arc surface. Along the direction X from the inner rotating disk 4 to the outer rotating disk 1, the cross-sectional shape of the covering part 10 is a chamfered structure. The opening of the chamfered structure faces the first hollow part 120. The cross-sectional shape of the supporting part 12 is rectangular. The first hollow part 120 is provided in the middle of the supporting part 12, and the first hollow part 120 penetrates the supporting part 12 along the direction X from the inner rotating disk 4 to the outer rotating disk 1. The inner rotating disk 4 is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a locking part 41, a second receiving part 42, and a connecting part 43 connected in sequence. The orthographic projections of the locking part 41, the second receiving part 42, and the connecting part 43 along the direction from the inner rotating disk 4 to the outer rotating disk 1 are all annular. The locking part 41... Corresponding to the covering part 10, along the direction from the inner rotating disk 4 to the outer rotating disk 1, the orthographic projection of the second receiving part 42 completely overlaps with the orthographic projection of the first receiving part 11; it is snapped into the chamfered structure through the opening snap-fit ​​part 41 of the chamfered structure, the second receiving part 42 protrudes away from the outer rotating disk 1 to form an arc surface, the connecting part 43 has a second hollow part 430, the second hollow part 430 passes through the connecting part 43 along the direction X from the inner rotating disk 4 to the outer rotating disk 1, and a receiving space with a circular cross section is formed between the first receiving part 11 and the second receiving part 42, and a metal ball 7 is provided in the receiving space; the limiting base 2 is a first circular structure, which is connected to the side of the bearing part 12 near the connecting part 43, and at least two ball bearings 3 are provided on the first circular structure, at least Two ball bearings 3 are arranged along the circumference of the first circular structure and pass through the first hollow part 120; the limiting member 5 includes a first insertion part 51, a limiting part 52 and a second insertion part 53 connected in sequence. The limiting part 52 is a second circular structure. At least two first limiting holes 521 are provided on the second circular structure. The at least two first limiting holes 521 are arranged along the circumference of the second circular structure. The first limiting holes 521 cooperate with the ball bearings 3. The first insertion part 51 and the second insertion part 53 are both inserted into the gap between the bearing part 12 and the connecting part 43. The first insertion part 51 and the second insertion part 53 are respectively fixedly connected to their corresponding connecting parts 43. The connecting part 43 rotates relative to the bearing part 12, and the limiting ball 3 pops out of the first limiting hole 521.

[0031] Specifically, in combination Figures 2-7 As shown, the outer rotating disk 1 and the inner rotating disk 4 are arranged opposite each other. For example, the inner rotating disk 4 is located above the outer rotating disk 1, or the inner rotating disk 4 is located below the outer rotating disk 1. In this embodiment, the inner rotating disk 4 is located above the outer rotating disk 1 as an example.

[0032] Combination Figure 4 , Figure 7 and Figure 11 As shown, the aforementioned rotating outer disk 1 is a first hollow disk structure, which includes a covering portion 10, a first receiving portion 11, and a supporting portion 12. The covering portion 10 is located on the outer ring of the first hollow disk structure, the supporting portion 12 is located on the inner ring of the first hollow disk structure, and the first receiving portion 11 is located between the covering portion 10 and the supporting portion 12. That is, the covering portion 10, the first receiving portion 11, and the supporting portion 12 are connected sequentially along the radial direction of the first hollow disk structure. The cross-section of the covering portion 10 along the radial direction of the first hollow disk structure is a C-shaped structure. The opening of the C-shaped structure faces the first hollow portion 120 and is used to cooperate with the snap-fit ​​portion 41 of the rotating inner disk 4. The first receiving portion 11 is recessed away from the rotating inner disk 4 to form an arc surface for accommodating the metal ball 7. The cross-section of the supporting part 12 along the radial direction of the first hollow disk structure is rectangular, and the hollow part is the first hollow part 120. The first hollow part 120 penetrates the supporting part 12 in the direction X from the rotating inner disk 4 to the rotating outer disk 1. The supporting part 12 is used to support the limiting base 2, that is, to provide support and limiting functions for the limiting base 2. Through the cooperation of the covering part 10, the first receiving part 11 and the supporting part 12, as the outer layer structure of the rotatable limiting part 100, the supporting part 10 is used to fix the rotating inner disk 4, the first receiving part 11 is used to receive the metal ball 7, and the supporting part 12 is used to install the limiting base 2.

[0033] Optionally, the aforementioned covering portion 10, first receiving portion 11, and supporting portion 12 are an integral structure. This integral structure not only reduces connection points and splicing areas, thus avoiding structural failures due to loosening or breakage at the connections, but also reduces the number of parts requiring individual processing and assembly, lowering assembly difficulty and time costs. Furthermore, since there are no splicing errors between the covering portion 10, first receiving portion 11, and supporting portion 12, the integral structure ensures higher assembly precision, guaranteeing the normal operation of the rotation and limiting functions of the rotating parts. In addition, the integral structure reduces the relative movement between the covering portion 10, first receiving portion 11, and supporting portion 12, thereby reducing damage caused by friction and wear.

[0034] Combination Figure 4 , Figure 7 and Figure 12As shown, the aforementioned rotating inner disk 4 is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a snap-fit ​​portion 41, a second receiving portion 42, and a connecting portion 43 connected in sequence. The snap-fit ​​portion 41 corresponds to the covering portion 10 of the rotating outer disk 1. The second receiving portion 42 protrudes away from the rotating outer disk 1 to form an arc surface. The second receiving portion 42 and the first receiving portion 11 cooperate with each other. Several metal balls 7 are placed in the gap between the second receiving portion 42 and the first receiving portion 11, such that the several metal balls 7 are arranged along the circumferential direction of the first and second hollow disk structures. The connecting portion 43 corresponds to the supporting portion 12. A second hollow portion 430 is provided in the connecting portion 43, and the second hollow portion 430 penetrates the connecting portion 43 in the direction X from the rotating inner disk 4 to the rotating outer disk 1. The aforementioned metal ball 7 can be a steel ball, meaning that a steel ball is placed in the gap between the first receiving part 11 and the second receiving part 42. Placing the steel ball in this gap eliminates the need for additional space, fully utilizing the space and saving space to reduce costs. The aforementioned snap-fit ​​part 41, the second receiving part 42, and the connecting part 43 work together as the inner structure of the rotatable limiting member 100, cooperating with the rotating outer disk 1 to achieve the rotation function. The aforementioned locking part 41, second receiving part 42, and connecting part 43 are an integral structure. This integrated design not only eliminates connection points between the components (locking part 41, second receiving part 42, and connecting part 43), reducing the risk of structural failure due to loosening or breakage at the connections, but also makes the rotating inner disk 4 more robust and durable under load or frequent use. Furthermore, the absence of splicing errors between the parts ensures higher assembly precision, resulting in a tighter fit between the rotating inner disk 4 and the rotating outer disk 1, thus making the rotation and limiting functions more stable. Simultaneously, because the locking part 41, second receiving part 42, and connecting part 43 are integrated, the engagement of the ball 3 and the metal ball 7 is more precise, better achieving the limiting function.

[0035] Combination Figure 4 , Figure 6 and Figure 9As shown, the aforementioned limiting base 2 is a first circular structure, which is fixedly connected to the support portion 12 near the connecting portion 43. A plurality of ball bearings 3 are inserted into the first circular structure, arranged circumferentially, with the bottom of each ball bearing 3 passing through the first hollow portion 120 of the support portion 12. This limiting base 2 provides the mounting position for the ball bearings 3. The number of ball bearings 3 can be two, three, four, or five. Of course, the number of ball bearings 3 can be increased or decreased depending on the actual situation; this embodiment does not impose a specific limitation. This embodiment uses four ball bearings 3 as an example. The four ball bearings 3 can form a rectangular structure, making the structure more stable when the inner rotating disk 4 and the outer rotating disk 1 rotate at any angle.

[0036] The aforementioned ball bearing 3 is a standard component. It includes a housing, a spring, and a ball bearing. The ball bearing can extend and retract under the action of the spring. When the connecting part 43 of the inner rotating disk 4 rotates relative to the supporting part 12 of the outer rotating disk 1, the ball bearing 3 engages in the first limiting hole 521, thus placing the inner rotating disk 4 in a limited state. As the connecting part 43 of the inner rotating disk 4 continues to rotate relative to the supporting part 12 of the outer rotating disk 1, the ball bearing 3 retracts into the housing, thereby releasing the limited state of the inner rotating disk 4 and allowing it to move freely. Since the ball bearing 3 is a technology known to those skilled in the art and is not an improvement, it does not require detailed description. Those skilled in the art can understand the specific structure and how to implement it based on the location and overall structure of this solution.

[0037] Combination Figure 4 , Figure 5 and Figure 8As shown, the aforementioned limiting member 5 can be a limiting piece, which includes a first insertion part 51, a limiting part 52, and a second insertion part 53. The limiting part 52 is a second circular structure, and a plurality of first limiting holes 521 are provided on the second circular structure. The plurality of first limiting holes 521 are arranged along the circumferential direction of the second circular structure. The first insertion part 51 and the second insertion part 53 are used to insert into the gap between the bearing part 12 and the connecting part 43. The first insertion part 51 and the second insertion part 53 are respectively fixedly connected to the connecting part 43. The number of the first limiting holes 521 can be two, three, four, five, six, seven, eight, or nine. If there are two first limiting holes 521, the inner rotating plate 4 and the outer rotating plate 1 are limited by 180°; if there are three first limiting holes 521, the inner rotating plate 4 and the outer rotating plate 1 are limited by 120°; if there are four first limiting holes 521, the inner rotating plate 4 and the outer rotating plate 1 are limited by 90°; if there are five first limiting holes 521, the inner rotating plate 4 and the outer rotating plate 1 are limited by 72°; and if there are eight first limiting holes 521, the inner rotating plate 4 and the outer rotating plate 1 are limited by 45°. That is, depending on the number of first limiting holes 521, different angles of limiting can be achieved, and the cabinet can be precisely limited to a certain angle. This embodiment only uses eight first limiting holes 521 as an example. Of course, the number of first limiting holes 521 can be increased or decreased according to actual conditions, and this embodiment does not make a specific limitation. The shape of the first limiting hole 521 can be circular or elliptical. This embodiment uses an elliptical shape as an example. By having multiple ball bearings 3 cooperate with multiple first limiting holes 521 on the limiting member 5, the rotation angle is limited. That is, by cooperating with the ball bearings 3, the first limiting holes 521 and the first limiting holes 521 are used to limit the rotation of the inner rotating disk 4 and the outer rotating disk 1. When the connecting part 43 rotates relative to the bearing part 12, the ball bearings 3 pop out of the first limiting holes 521, limiting the rotation angle.

[0038] The first insertion part 51, the limiting part 52, and the second insertion part 53 are integrated into one structure. By adopting an integrated structure for the first insertion part 51, the limiting part 52, and the second insertion part 53, it is possible to significantly improve the structural strength, stability (such as ensuring higher assembly accuracy, ensuring a tighter fit between the ball 3 and the first limiting hole 521, and making the limiting function more stable) and durability of the limiting part 5. In addition, it simplifies the manufacturing and assembly process, reduces production costs, and improves design flexibility and aesthetics.

[0039] Compared with the prior art, the rotatable limiting component 100 provided in this embodiment achieves at least the following beneficial effects:

[0040] First, it can achieve dual functions of rotation and limiting. For example, the structural design of the inner rotating disc 4 and the outer rotating disc 1 allows them to rotate relative to each other within a limited range. The rotation angle is limited by the cooperation of the ball bearing 3 on the limiting base 2 and the first limiting hole 521 on the limiting component 5, such as precisely limiting the cabinet to a certain angle. It is suitable for occasions requiring precise control of the rotation angle, while also possessing high stability and reliability. Second, the entire device has a compact structure. The outer rotating disc 1, the limiting base 2, the ball bearing 3, the limiting component 5, and the inner rotating disc 4 cooperate with each other, achieving a high degree of integration of limiting and rotation functions, saving space, and facilitating installation and use.

[0041] Optionally, combined Figure 4 and Figure 6 As shown, along the direction X from the inner rotating disk 4 to the outer rotating disk 1, the thickness of the inner rotating disk 4 and the outer rotating disk 1 are both less than the thickness of the limiting base 2. The thickness of the limiting base 2 is the same as the thickness of the limiting member 5. Making the thickness of the limiting base 2 greater than the thickness of the inner rotating disk 4 and the outer rotating disk 1 not only makes the limiting base 2 and the limiting member 5 structurally more robust, better able to withstand the forces and torques generated during rotation, but also ensures a tighter and more precise fit between the ball 3 and the first limiting hole 521. This design reduces fitting errors caused by thickness differences, thereby improving the reliability of the limiting function. Simultaneously, because the limiting base 2 and the limiting member 5 have the same thickness, alignment and fixation are easier during assembly. This design reduces adjustment and calibration work during assembly, improving assembly efficiency. Furthermore, the thinner design of the inner rotating disk 4 and the outer rotating disk 1 reduces the overall structural thickness, making the entire limiting rotating component 100 more compact. The thinner inner rotating disk 4 and the outer rotating disk 1 also reduce material usage, thereby lowering production costs.

[0042] If the thickness of the outer rotating disk 1, inner rotating disk 4, and limiting base 2 along the X-direction from the inner rotating disk 4 to the outer rotating disk 1 is too thick, it will increase space occupation; if it is too thin, it will lead to insufficient strength of the outer rotating disk 1, inner rotating disk 4, and limiting base 2. Therefore, the thickness range of the inner rotating disk 4 and outer rotating disk 1 can be 0.8mm to 1.2mm. This not only reduces space occupation but also ensures that the inner rotating disk 4 and outer rotating disk 1 have sufficient strength, thereby improving the strength of the rotatable limiting component. The thickness of the inner rotating disk 4 and outer rotating disk 1 along the X-direction from the inner rotating disk 4 to the outer rotating disk 1 can be 0.8mm, 0.9mm, 1mm, 1.1mm, or 1.2mm. The thickness range of the limiting base 2 along the X-direction from the inner rotating disk 4 to the outer rotating disk 1 is 1.5mm-2mm. This not only reduces space occupation but also ensures that the limiting base 2 has sufficient strength, thereby improving the strength of the rotatable limiting component. The thickness of the limiting base 2 in the direction X from the inner rotating disk 4 to the outer rotating disk 1 is 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2.0mm.

[0043] Optionally, the diameter of the first circular structure is the same as the diameter of the second circular structure. This approach not only ensures a tighter and more precise fit between the ball 3 and the first limiting hole 521, such as the ball 3 being able to accurately embed into the first limiting hole 521 to achieve a precise limiting function, but also makes it easier to align the limiting base 2 and the limiting component 5 during assembly. This reduces the adjustment and calibration work during assembly, improves assembly efficiency, and makes the entire structure more harmonious and compact in appearance.

[0044] In one alternative embodiment, combined with Figure 4 , Figure 6 and Figure 12 As shown, Figure 12 This is a schematic diagram of the structure of a sound-absorbing pad provided by this utility model; a sound-absorbing pad 6 is provided on the side of the limiting member 5 away from the limiting base 2. The sound-absorbing pad 6 is a circular pad, and the direction X is along the inner rotating disk 4 pointing to the outer rotating disk 1. The orthographic projection of the sound-absorbing pad 6 completely overlaps with the orthographic projection of the second circular structure. A notch 61 corresponding to the first limiting hole 521 is opened on the edge of the circular pad. The notch 61 is U-shaped and recessed towards the center of the circular pad.

[0045] Specifically, the aforementioned sound-absorbing pad 6 is installed on the side of the limiting member 5 away from the limiting base 2. For example, the sound-absorbing pad 6 can be directly adhered to the side of the limiting member 5 away from the limiting base 2. Specifically, the sound-absorbing pad 6 is attached to the limiting member 5 using double-sided adhesive. During rotation, this sound-absorbing pad 6 fills the gap between the limiting member 5 and the cabinet. When the ball bearing 3 is inserted into the second limiting hole 23 of the limiting member 5, it reduces noise. That is, during rotation, the sound-absorbing pad 6 is located between the limiting member 5 and the second hollow part 430. Since when the rotatable limiting member is assembled into the cabinet, the limiting member 5 and the cabinet are separated by the rotating inner plate 4, forming a cavity. However, when the ball bearing 3 rotates into the first limiting hole 521, the cavity may amplify the impact sound when the ball bearing 3 pops out. By filling the cavity formed between the limiting member 5 and the cabinet with the sound-absorbing pad 6, the impact sound when the ball bearing 3 pops out is reduced. The sound-absorbing pad 6 can be a circular pad, its shape matching the second circular structure of the limiting member 5. Along the direction X from the inner rotating disk 4 to the outer rotating disk 1, the orthographic projection of the noise-absorbing pad 6 completely overlaps with the orthographic projection of the second circular structure of the limiting member 5. That is, the noise-absorbing pad 6 completely covers the surface of the limiting member 5, ensuring a more effective reduction of the impact sound when the ball 3 pops out during rotation. Optionally, the noise-absorbing pad 6 can be made of silicone or rubber. The edge of the noise-absorbing pad 6 has a notch 61 corresponding to the first limiting hole 521. This notch 61 can be U-shaped and recessed towards the center of the circular pad, ensuring that the ball 3 can pass smoothly through the first limiting hole 521 without obstructing its movement. The notch 61 prevents interference between the noise-absorbing pad 6 and the ball 3 when it enters and exits the first limiting hole 521, thus ensuring the normal operation of the limiting function. Using the above solution, the noise-absorbing pad 6 not only reduces noise generated during rotation but also ensures that it covers the entire surface of the limiting member 5, preventing the limiting function from failing due to inaccurate positioning of the noise-absorbing pad 6. The U-shaped notch 61 corresponds to the first limiting hole 521 and is recessed towards the center, ensuring that the ball 3 can pass smoothly through the first limiting hole 521 without hindering its movement, thus guaranteeing the high precision and reliability of the limiting function. Furthermore, the circular design of the sound-absorbing pad 6 and its complete overlap with the limiting member 5 make the entire structure more compact.

[0046] Optionally, continue to refer to Figure 4 , Figure 10 and Figure 11As shown, along the direction X from the inner rotating disk 4 to the outer rotating disk 1, the orthographic projection of the first hollow portion 120 lies within the orthographic projection of the second hollow portion 430, meaning the diameter of the first hollow portion 120 is smaller than the diameter of the second hollow portion 430. This design not only ensures spatial alignment of the first hollow portion 120 and the second hollow portion 430, making the relative movement between the inner rotating disk 4 and the outer rotating disk 1 smoother and reducing friction or jamming caused by inaccurate alignment, but also facilitates precise alignment during assembly, reducing assembly errors and improving assembly efficiency. Simultaneously, it ensures a tighter and more precise fit between the ball bearing 3 and the first limiting hole 521. The smoother relative movement between the inner rotating disk 4 and the outer rotating disk 1 reduces rotational jamming or abnormal noise caused by structural interference, while also facilitating the insertion of the first insertion portion 51 and the second insertion portion 53.

[0047] In an optional embodiment, the support portion 12 has a first support hole 121 and a second support hole 122, which are respectively arranged around the first hollow portion 120. The second support hole 122 is located near the first hollow portion 120 and passes through the support portion 12 in the direction X from the inner rotating disk 4 to the outer rotating disk 1. The connecting portion 43 has a connecting hole 431 arranged around the second hollow portion 430 and in the direction X from the inner rotating disk 4 to the outer rotating disk 1. In the direction X of the outer disk 1, the connecting hole 431 passes through the connecting part 43, and the orthographic projection of the connecting hole 431 does not overlap with the orthographic projection of the second bearing hole 122; the limiting base 2 is provided with a second limiting hole 23 and a base hole 21. In the direction from the rotating inner disk 4 to the rotating outer disk 1, the orthographic projection of the base hole 21 completely overlaps with the orthographic projection of the second bearing hole 122, and the orthographic projection of the ball 3 completely overlaps with the orthographic projection of the second limiting hole 23. The second limiting hole 23 and the base hole 21 pass through the limiting base 2 in the direction X from the rotating inner disk 4 to the rotating outer disk 1.

[0048] Specifically, in combination Figure 6 and Figure 10 As shown, a first bearing hole 121 and a second bearing hole 122 are provided in the bearing portion 12. The first bearing hole 121 and the second bearing hole 122 are respectively arranged around the first hollow hole. The second bearing hole 122 is located near the first bearing hole 121.

[0049] The first fastener 54 connects the limiting base 2 and the bearing portion 12 in the rotating outer disk 1 together, thereby fixing the limiting base 2 to the rotating outer disk 1. The first fastener 54 includes a screw 541 and a nut 542 threadedly connected to the screw 541. The screw 541 passes sequentially through the base hole 21 of the limiting base 2 and the second bearing hole 122 corresponding to the base hole 21, and then the nut 542 is threadedly screwed onto the screw 541. There can be two first fasteners 54, which are symmetrically distributed between them. This not only improves the strength and stability of the connection between the limiting base 2 and the rotating outer disk 1, but also enhances the symmetry and balance of the structure.

[0050] The first bearing hole 121 is used to provide a channel for installing the second fastener 22. The second fastener 22 passes through the first bearing hole 121 and fixes the first insertion part 51 and the second insertion part 53 of the limiting member 5 to the connecting part 43 and the connecting part 43 to the cabinet (such as the top plate of the cabinet, or the bottom plate of the cabinet, or the top plate and the bottom plate of the cabinet), thereby fixing the limiting member 5 to the rotating inner plate 4 and the rotating inner plate 4 to the cabinet.

[0051] The number of second fasteners 22 can be the same as the number of first bearing holes. For example, there are 4 second fasteners 22. The 4 second fasteners 22 are symmetrically distributed among each other. The 4 second fasteners 22 fix the limiting member 5 and the rotating inner plate 4 and the rotating inner plate 4 and the cabinet to improve the strength and stability of the connection between the limiting member 5 and the rotating inner plate 4 and the rotating inner plate 4 and the cabinet, and also enhance the symmetry and balance of the structure.

[0052] The second fastener 22 can be a locking screw (used to connect the limiting member 4, the rotating inner plate 4, and the cabinet). The locking screw passes through the first bearing hole 121, and then sequentially passes through the insertion holes 512 of the first insertion part 51 and the second insertion part 53 in the limiting piece 5, the connecting hole 431 in the connecting part 43 of the rotating inner plate 4, and the corresponding hole in the cabinet bottom plate. It is then threadedly connected to the locking nut on the cabinet to ensure a firm connection and anti-loosening function. In this embodiment, there are four second fasteners 22. Two of them pass through the insertion holes 512 of the first insertion part 51 and the second insertion part 53 in the limiting member 5 and are fixed to the cabinet bottom plate. The other two skip the limiting member 5 and directly fix the rotating inner plate 4 to the cabinet bottom plate through the connecting hole 431 in the connecting part 43 of the rotating inner plate 4.

[0053] Optionally, continue to refer to Figure 10As shown, the number of first bearing holes 121 can be less than the number of second bearing holes 122. In this embodiment, the number of first bearing holes 121 is 4 and the number of second bearing holes 122 is 8. Along the circumferential direction of the first hollow disk structure, each first bearing hole 121 can be located between adjacent second bearing holes 122.

[0054] Continue to refer to Figure 11 As shown, a connecting hole 431 is formed around the second hollowed-out portion 430 in the connecting portion 43. This connecting hole 431 penetrates the connecting portion 43 in the direction X from the inner rotating disk 4 to the outer rotating disk 1. The orthographic projection of the connecting hole 431 does not overlap with the orthographic projection of the second supporting hole 122, thus the connecting portion 43 and the supporting portion 12 are spatially separated to avoid interference. (Continue referring to...) Figure 9 As shown, a base hole 21 corresponding to the second bearing hole 122 is provided on the limiting base 2. The base hole 21 passes through the limiting base 2 in the direction X from the inner rotating disk 4 to the outer rotating disk 1. The limiting base 2 is fixed to the outer rotating disk 1 through the base hole 21 and the second bearing hole 122, so as to ensure the stability of the limiting base 2 and the consistency of the rotational movement.

[0055] By adopting the above scheme, the design of the first bearing hole 121, the second bearing hole 122, and the base hole 21 not only ensures the stability of the entire structure during rotation or load-bearing, but also ensures the correct spatial alignment of the rotating outer disk 1, the limiting base 2, the limiting component 5, and the rotating inner disk 4, avoiding interference and friction. Furthermore, it effectively transmits force and torque, supports rotational motion, and optimizes the spatial layout, ensuring that the aforementioned different components work effectively within a limited space.

[0056] In an alternative embodiment, reference continues... Figure 10 As shown, the first bearing hole 121 and the second bearing hole 122 are both circular in shape. The diameter of the first bearing hole 121 is larger than the diameter of the second bearing hole 122. By adopting this scheme, the diameter of the first bearing hole 121 is larger than the diameter of the second bearing hole 122, which not only facilitates the passage of the second fastener 22 and makes it easier to install and remove the second fastener 22, but also reduces the weight of the bearing part 12, thereby reducing the weight of the rotating outer disk 1.

[0057] In an optional embodiment, the first insertion portion 51 and the second insertion portion 53 are arranged in a mirror symmetry. The shapes of the first insertion portion 51 and the second insertion portion 53 are respectively arc-shaped trapezoids. The first insertion portion 51 and the second insertion portion 53 each include an upper bottom surface 510 and a lower bottom surface 511. The lower bottom surface 511 is located on the side of the upper bottom surface 510 near the second hollow portion 430. The lower bottom surface 511 and the upper bottom surface 510 are respectively arc surfaces protruding away from the second circular structure. The first insertion portion 51 and the second insertion portion 53 are each provided with an insertion hole 512 corresponding to the first bearing hole 121. The second insertion portion 53 and its corresponding connecting portion 43 are respectively connected to the second insertion portion 53 and its corresponding connecting portion 43, and the first insertion portion 51 and its corresponding connecting portion 43 are respectively connected to the second fastener 22.

[0058] Specifically, in combination Figure 4 and Figure 8 As shown, the mirror-symmetric arrangement between the first insertion part 51 and the second insertion part 53 ensures the balance and uniform force distribution of the limiting member 5, improving the stability and durability of the rotatable limiting member 100. The first insertion part 51 and the second insertion part 53 are curved trapezoids, which are beneficial for matching the annular space between the bearing part 12 and the connecting part 43. Both the first insertion part 51 and the second insertion part 53 include an upper bottom surface 510 and a lower bottom surface 511. The lower bottom surface 511 is located on the side of the upper bottom surface 510 near the second hollow part 430. The lower bottom surface 511 and the upper bottom surface 510 are respectively curved surfaces protruding away from the second circular structure. The arc length of the upper bottom surface 510 is less than the arc length of the lower bottom surface 511. The arc length of the lower bottom surface 511 coincides with part of the circle of the second circular structure. It can be understood that the lower bottom surface 511 is part of the second circular structure. The apex corner between the upper bottom surface 510 and the two inclined surfaces can be rounded.

[0059] Both the first insertion part 51 and the second insertion part 53 are provided with insertion holes 512 corresponding to a portion of the first bearing holes 121. Second fasteners 22 are respectively connected between the first insertion part 51 and its corresponding connecting part 43 and between the second insertion part 53 and its corresponding connecting part 43. In this embodiment, there are 4 second fasteners 22. The first second fastener 22 passes through its corresponding first bearing hole 121 and then through the insertion hole 512 of the first insertion part 51 and the connecting hole 431 of the connecting part 43, so that the first insertion part 51, the rotating inner plate 4 and the cabinet are fixedly connected. The second second fastener 22 passes through its corresponding first bearing hole 121 and then through the insertion hole 512 of the second insertion part 53 and the connecting hole 431 of the connecting part 43, so that the second insertion part 53, the rotating inner plate 4 and the cabinet are fixedly connected. The remaining two second fasteners 22 are directly fixedly connected to the cabinet through the connecting holes 431.

[0060] The above solution not only ensures the fixation and connection between the limiting component 5 and the rotating inner disk 4, preventing relative movement or separation, but also improves the stability and durability of the structure, while effectively transmitting force and torque to support rotational motion. Furthermore, it optimizes the spatial layout, ensuring that each component operates effectively within a limited space while maintaining structural compactness.

[0061] Optionally, combined Figure 4 and Figure 5 As shown, a first fastener 54 connects the limiting base 2 and the supporting part 12 through the base hole 21 and the second supporting hole 122. The first fastener 54 not only securely connects the limiting base 2 and the supporting part 12, ensuring the stability and reliability of the entire structure (preventing displacement or loosening of components during use and improving the overall durability), but also effectively transmits the force and load borne by the supporting part 12 to the limiting base 2, ensuring even load distribution and avoiding localized overload or damage. Furthermore, it simplifies the assembly process, making the connection between the limiting base 2 and the supporting part 12 more convenient and quick. The first fastener 54 is also easy to disassemble if maintenance or component replacement is required.

[0062] Reference Figure 13 and Figure 14 As shown, Figure 13 This is a flowchart illustrating an assembly method for a rotatable component with a limiting position provided by this utility model. Figure 14 This is a simplified flowchart of an assembly method for a rotatable component with limiting position provided by this utility model; this embodiment provides an assembly method for a rotatable component 100 with limiting position, including:

[0063] Step 100 can limit the rotating component 100, including a rotating outer disk 1, a limiting base 2, a ball bearing 3, a limiting component 5, a rotating inner disk 4, and a sound-absorbing pad 6. The rotating outer disk 1 and the rotating inner disk 4 are parallel, and the rotating outer disk 1 is located below the rotating inner disk 4. The rotating outer disk 1 is a first hollow disk structure. Along the radial direction of the first hollow disk structure, the first hollow disk structure includes a covering part 10, a first receiving part 11, and a supporting part 12 connected in sequence. The orthographic projection of the covering part 10, the first receiving part 11, and the supporting part 12 along the direction from the rotating inner disk 4 to the rotating outer disk 1 is all annular. The first hollow disk structure has a first hollow part 120. The first receiving part 11 is recessed to the side away from the rotating inner disk 4 to form an arc surface. 4. In the direction X pointing to the rotating outer disk 1, the cross-sectional shape of the covering part 10 is a C-shaped structure, and the opening of the C-shaped structure faces the first hollow part 120. The cross-sectional shape of the supporting part 12 is rectangular. The first hollow part 120 is provided in the middle of the supporting part 12, and the first hollow part 120 penetrates the supporting part 12 along the direction X pointing from the rotating inner disk 4 to the rotating outer disk 1. The rotating inner disk 4 is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a snap-fit ​​part 41, a second receiving part 42, and a connecting part 43 connected in sequence. The orthographic projection of the snap-fit ​​part 41, the second receiving part 42, and the connecting part 43 along the direction pointing from the rotating inner disk 4 to the rotating outer disk 1 is annular. The snap-fit ​​part 41 corresponds to the covering part 10. The inner rotating disk 4 points in the direction of the outer rotating disk 1, and the orthographic projection of the second receiving part 42 completely overlaps with the orthographic projection of the first receiving part 11. It is engaged within the chamfered structure via the opening snap-fit ​​part 41. The second receiving part 42 protrudes away from the outer rotating disk 1 to form an arc surface. A second hollow part 430 is provided on the connecting part 43, and the second hollow part 430 penetrates the connecting part 43 along the direction X from the inner rotating disk 4 to the outer rotating disk 1. A circular receiving space is formed between the first receiving part 11 and the second receiving part 42, and a metal ball 7 is placed within the receiving space. The limiting base 2 is a first circular structure, which is connected to the side of the bearing part 12 near the connecting part 43. At least two ball bearings 3 are provided on the first circular structure. The ball 3 is arranged along the circumference of the first circular structure and passes through the first hollow part 120; the limiting member 5 includes a first insertion part 51, a limiting part 52 and a second insertion part 53 connected in sequence. The limiting part 52 is a second circular structure. At least two first limiting holes 521 are provided on the second circular structure. The at least two first limiting holes 521 are arranged along the circumference of the second circular structure. The first limiting holes 521 cooperate with the ball 3. The first insertion part 51 and the second insertion part 53 are both inserted into the gap between the bearing part 12 and the connecting part 43. The first insertion part 51 and the second insertion part 53 are respectively fixedly connected to their corresponding connecting parts 43. The connecting part 43 rotates relative to the bearing part 12, and the limiting ball 3 pops out of the first limiting hole 521.A sound-absorbing pad 6 is provided on the side of the limiting member 5 away from the limiting base 2. The sound-absorbing pad 6 is a circular pad, pointing in the direction X from the inner rotating disk 4 to the outer rotating disk 1. The orthographic projection of the sound-absorbing pad 6 completely overlaps with the orthographic projection of the second circular structure. A notch 61 corresponding to the first limiting hole 521 is opened on the edge of the circular pad. The notch 61 is U-shaped and recessed towards the center of the circular pad.

[0064] Step 101 provides a rotating inner disk 4, a rotating outer disk 1, and metal balls 7. The metal balls 7 (such as steel balls) are arranged circumferentially within the first receiving portion 11 of the rotating outer disk 1. The locking portion 41 of the rotating inner disk 4 is fastened to the covering portion 10 of the rotating outer disk 1. The metal balls 7 are located in the gap between the first receiving portion 11 of the rotating outer disk 1 and the second receiving portion 42 of the rotating inner disk 4. The covering portion 10 of the rotating outer disk 1 is bent to lock the locking portion 41 of the rotating inner disk 4. Specifically, combined with... Figure 4 , Figure 13 and Figure 14 As shown, the rotating inner disk 4 and rotating outer disk 1 are the main components of the rotating part. The rotating inner disk 4 and rotating outer disk 1 achieve the rotation function through the metal ball 7. The rotating inner disk 4 and rotating outer disk 1 can be made of 1mm thick steel plate by stamping. The edges of the rotating outer disk 1 are finished by a rotary edge pressing machine. In this embodiment, the rotating inner disk 4 and rotating outer disk 1 are each made of 1mm thick steel plate and formed by stamping. The edges of the rotating outer disk 1 are finished by a rotary edge pressing machine to enhance the structural strength and aesthetics.

[0065] Steel balls are placed in the first receiving portion 11 of the rotating outer disk 1. The rotating inner disk 4 is then placed on the rotating outer disk 1, with the steel balls positioned in the gap between the second receiving portion 42 of the rotating inner disk 4 and the first receiving portion 11 of the rotating outer disk 1. The first receiving portion 11 of the rotating outer disk 1 is filled with steel balls along its circumference. These steel balls are used to reduce friction during rotation and support the rotational movement. Specifically, when the rotating inner disk 4 is attached, the covering portion 10 of the rotating outer disk 1 bends and engages with the locking portion 41 of the rotating inner disk 4, ensuring the connection between the rotating inner disk 4 and the rotating outer disk 1. The steel balls placed in the gap between the first receiving portion 11 of the rotating outer disk 1 and the second receiving portion 42 of the rotating inner disk 4 form a rolling support during rotation.

[0066] Step 102 provides a limiting base 2 and a contact ball 3. At least two contact balls 3 are placed on the limiting base 2, and the limiting base 2 is connected to the bearing part 12 of the rotating outer disk 1. Specifically, the contact ball 3 is a standard part that can be directly purchased from the market. The limiting base 2 is used to provide fixed support for the contact ball to ensure its accurate position. It can also be called a contact ball base. The limiting base 2 can be made of 2mm steel plate. In this embodiment, four contact balls are used as an example. The four contact balls form a rectangular structure. The four contact balls are placed into the limiting base 2. The limiting base 2 is placed on the bearing part of the rotating outer disk 1 near the insertion part of the rotating inner disk 4 to ensure the fixation of the limiting base 2. The first fastener 54 is used to fix the limiting base 2 on the rotating outer disk 1. The above-mentioned cooperation between the contact ball 3 and the limiting part 5 achieves the limitation of the rotation angle. It can be understood that the fixing method of screws and nuts ensures that the contact ball base and the rotating outer disk 1 are tightly connected to prevent loosening.

[0067] Step 103 provides a limiting member 5, which is snapped between the snap-fit ​​portion 41 of the rotating inner disk 4 and the bearing portion 12 of the rotating outer disk 1. The first insertion portion 51 and the second insertion portion 53 in the limiting member 5 are connected to the snap-fit ​​portion 41 of the rotating inner disk 4. For example, the insertion holes 512 of the first insertion portion 51 and the second insertion portion 53 in the limiting member 5 are connected to the connection holes 431 of the snap-fit ​​portion 41 of the rotating inner disk 4 using the second fastener 22.

[0068] The aforementioned limiting member 5 can be a limiting plate, which cooperates with the limiting ball 3 installed on the limiting base 2 to limit the rotation angle of the rotatable member 100. This limiting plate can be made of 2mm thick steel plate. The installation of the limiting plate involves three steps: a) Insert the limiting member 5 obliquely into the second hollow portion 430 of the rotating inner disk 4; b) Continue the operation until the limiting member 5 is completely embedded in the second hollow portion 430 of the rotating inner disk 4; c) Move the limiting member 5 horizontally in the opposite direction so that it is locked between the connecting portion 43 of the rotating inner disk 4 and the receiving portion of the rotating outer disk 1, ensuring the fixing of the limiting member 5. The oblique insertion, embedding, and reverse movement are to ensure the correct installation and secure locking of the limiting member 5. Align the insertion holes 512, connecting holes 431, and first bearing holes 121 of the first insertion portion 51 and the second insertion portion 53 in the limiting member 5 and install the second fastener 22 (as shown on the limiting member 5). The insertion holes 512 at both ends are aligned with the connection holes 431 of the rotating inner disk 4. The four connection holes 431 of the rotating inner disk 4 are aligned with the first bearing hole 121 of the rotating outer disk 1. The second fastener 22 first passes through the first bearing hole 121 of the rotating outer disk 1, and then the second fastener 22 connects to the connection holes 431 of the rotating inner disk 4 through the insertion holes 512. In the limiting member 5, the first insertion part 51 and the second insertion part 53 are connected to the connection holes 431 of the snap-fit ​​part 41 of the rotating inner disk 4, and only the locking screw is connected. When it is subsequently assembled into the cabinet, the locking nut is installed in the cabinet, and the locking nut is threaded to the locking screw. The locking screw is used to fix the rotating inner disk 4 to the cabinet, further ensuring the stability between the limiting piece, the rotating inner disk and the cabinet. The rotating inner disk 4 is rotated in any direction by an angle, and the top cap of the second fastener 22 is clamped between the connection part 43 of the rotating inner disk 4 and the bearing part 12 of the rotating outer disk 1, without occupying additional space.

[0069] Step 104 provides a sound-absorbing pad 6, which is adhered to the side of the limiting member 5 away from the limiting base 2. Specifically, the sound-absorbing pad 6 is provided and adhered to the side of the limiting member 5 away from the limiting base 2 to reduce noise and vibration during rotation. The sound-absorbing pad 6 is made of silicone and is attached to the ball-stop limiting plate with double-sided tape on the back. During rotation, the sound-absorbing pad 6 fills the gap between the limiting member 5 and the cabinet. When the ball-stop 3 is engaged in the first limiting hole 521, the sound-absorbing pad 6 reduces noise. The sound-absorbing pad 6 is used to reduce the noise generated during rotation and improve the user experience. The silicone material has good elasticity, and by filling the cavity formed between the limiting member 5 and the cabinet with the sound-absorbing pad, noise is reduced when the ball-stop 3 collides with the limiting member 5. After the sound-absorbing pad 6 is installed, check that all components are securely installed, test the rotation and limiting functions to ensure normal operation. The inspection and testing are to ensure the assembly quality of the rotatable limiting member 100.

[0070] Compared with the prior art, the assembly method of the rotatable component 100 provided in this embodiment achieves at least the following beneficial effects:

[0071] The assembly method of the rotatable limiting component 100 provided in this embodiment assembles the rotatable limiting component 100, including the following steps: providing an inner rotating disk 4, an outer rotating disk 1, and a metal ball 7; placing the metal ball 7 along its circumference in the first receiving portion 11 of the outer rotating disk 1; fastening the locking portion 41 of the inner rotating disk 4 to the covering portion 10 of the outer rotating disk 1; the metal ball being located in the gap between the first receiving portion 11 of the outer rotating disk 1 and the second receiving portion 42 of the inner rotating disk 4; bending the covering portion 10 of the outer rotating disk 1 to lock the locking portion 41 of the inner rotating disk 4; providing a limiting base 2 and a ball catcher 3; placing at least two balls catchers 3 on the limiting base 2 respectively. The base 2 is connected to the support portion 12 of the rotating outer disk 1; a limiting member 5 is provided, which is snapped between the snap-fit ​​portion 41 of the rotating inner disk 4 and the support portion 12 of the rotating outer disk 1, and the second fastener 22 is used to connect the insertion holes 512 of the first insertion portion 51 and the second insertion portion 53 of the limiting member 5 with the connection holes 431 of the snap-fit ​​portion 41 of the rotating inner disk 4; a sound-absorbing pad 6 is provided, which is glued to the side of the limiting member 5 away from the limiting base 2; by adopting the above solution, the assembly quality of the rotatable limiting member 100 can be ensured, and its rotation and limiting functions can be realized. At the same time, the noise is reduced by the design of the sound-absorbing pad 6, and the user experience is improved.

[0072] Reference Figure 2 , Figure 15 , Figure 16 , 17 and Figure 18 As shown, Figure 15 This is a structural schematic diagram of a limitable rotating cabinet provided by this utility model; Figure 16 This is a schematic diagram of the rotational state structure of a limitable rotating cabinet provided by this utility model; Figure 17 This is a flowchart illustrating an assembly method for a limitable rotating cabinet provided by this utility model; Figure 18 This is a simplified flowchart of an assembly method for a rotatable component with limiting position provided by this utility model; this embodiment provides an assembly method for a rotatable cabinet 200 with limiting position, comprising assembling the rotatable cabinet 200, including:

[0073] Step 200: A rotatable cabinet 200 with adjustable positioning includes a first cabinet 201, at least one second cabinet 202, and a third cabinet 203. Each of the first cabinet 201, at least one second cabinet 202, and the third cabinet 203 is a hollow rectangular body with an opening. Adjacent first cabinets 201 and second cabinets 202, as well as second cabinets 202 and third cabinets 203, are connected by adjustable rotating components. Each adjustable rotating component includes a rotating outer disk 1, a limiting base 2, a ball bearing 3, a limiting element 5, and a rotating inner disk 4. The rotating outer disk 1 and the rotating inner disk 4 are parallel, with the rotating outer disk 1 located below the rotating inner disk 4. The rotating outer disk 1 is a first hollow circular disk. The structure, along the radial direction of the first hollow disk structure, includes a covering portion 10, a first receiving portion 11, and a supporting portion 12 connected in sequence. The orthographic projections of the covering portion 10, the first receiving portion 11, and the supporting portion 12 along the direction from the inner rotating disk 4 to the outer rotating disk 1 are all annular. The first hollow disk structure has a first hollow portion 120. The first receiving portion 11 is recessed to the side away from the inner rotating disk 4 to form an arc surface. Along the direction X from the inner rotating disk 4 to the outer rotating disk 1, the cross-sectional shape of the covering portion 10 is a chamfered structure, with the opening of the chamfered structure facing the side of the first hollow portion 120. The cross-sectional shape of the supporting portion 12 is rectangular. An opening is formed in the middle of the supporting portion 12. A first hollow portion 120 is provided, which penetrates the bearing portion 12 along the direction X from the inner rotating disk 4 to the outer rotating disk 1. The inner rotating disk 4 is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a locking portion 41, a second receiving portion 42, and a connecting portion 43 connected in sequence. The orthographic projections of the locking portion 41, the second receiving portion 42, and the connecting portion 43 along the direction from the inner rotating disk 4 to the outer rotating disk 1 are all annular. The locking portion 41 corresponds to the covering portion 10. Along the direction from the inner rotating disk 4 to the outer rotating disk 1, the orthographic projection of the second receiving portion 42 completely overlaps with the orthographic projection of the first receiving portion 11. The structure is U-shaped. The opening snap-fit ​​part 41 snaps into the C-shaped structure, the second receiving part 42 protrudes away from the rotating outer disk 1 to form an arc surface, the connecting part 43 has a second hollow part 430, the second hollow part 430 passes through the connecting part 43 in the direction X from the rotating inner disk 4 to the rotating outer disk 1, the first receiving part 11 and the second receiving part 42 form a receiving space with a circular cross section, and a metal ball 7 is provided in the receiving space; the limiting base 2 is a first circular structure, which is connected to the side of the bearing part 12 near the connecting part 43, and at least two ball bearings 3 are provided on the first circular structure, the at least two ball bearings 3 are arranged along the circumference of the first circular structure, and the ball bearings 3 pass through the first hollow part 120;The limiting member 5 includes a first insertion part 51, a limiting part 52, and a second insertion part 53 connected in sequence. The limiting part 52 is a second circular structure with at least two first limiting holes 521. The at least two first limiting holes 521 are arranged along the circumference of the second circular structure. The first limiting holes 521 cooperate with the ball 3. The first insertion part 51 and the second insertion part 53 are both inserted into the gap between the supporting part 12 and the connecting part 43. The first insertion part 51 and the second insertion part 53 are respectively fixedly connected to their corresponding connecting parts 43. When the connecting part 43 rotates relative to the supporting part 12, the limiting ball 3 pops out of the first limiting hole 521. The first cabinet 201, the second cabinet 202, and the third cabinet 203 are arranged in the direction X from the inner rotating disk 4 to the outer rotating disk 1.

[0074] Specifically, the aforementioned adjustable rotating cabinet 200 is applicable to various types of cabinets such as drawer cabinets, hinged cabinets, and mirror cabinets. This embodiment only uses a drawer cabinet as an example. It allows different layers of cabinets to rotate independently and can be limited at a fixed angle set by the user, such as 45 degrees. This design provides flexibility and convenience, allowing users to adjust the rotation angle of the cabinets according to their personal needs and spatial layout, thereby optimizing storage and retrieval efficiency. The first cabinet 201, the second cabinet 202, and the third cabinet 203 are the main components of the adjustable rotating cabinet 200. Each of the three cabinets is a hollow rectangular body with an opening. The rotatable limiter is used to connect adjacent first cabinets 201, second cabinets 202, and third cabinets 203. It allows the first cabinets 201, second cabinets 202, and third cabinets 203 to rotate within a certain angle and can be fixed in a specific position. For example, the first cabinets 201 and second cabinets 202, and the second cabinets 202 and third cabinets 203, are connected by the rotatable limiter, meaning each cabinet can rotate independently without affecting the others. The first cabinets 201, second cabinets 202, and third cabinets 203 are arranged in the direction X from the inner rotating disk 4 to the outer rotating disk 1, which helps optimize space utilization and improve the convenience of storing and retrieving items. The first cabinet 201 can be located at the top of the rotatable cabinet 200, the third cabinet 203 can be located at the bottom of the rotatable cabinet 200, and the second cabinet 202 is located between the first cabinet 201 and the third cabinet 203. The number of second cabinets 202 can be one, two, or more, depending on the actual situation. This embodiment only uses one second cabinet 202 as an example. The first cabinet 201, the second cabinet 202, or both can be fixed at a specific angle (e.g., 45 degrees) to prevent excessive rotation and ensure safe and stable use. In this embodiment, since there is only one second cabinet 202, the number of rotatable limiting components is two, namely the first rotatable limiting component 101 and the second rotatable limiting component 102.

[0075] By rotating and limiting the movement, not only can limited space be utilized more effectively, but users can also easily access the contents of the first cabinet 201, the second cabinet 202, and / or the third cabinet 203 without moving other cabinets, improving the convenience of storage and retrieval. Furthermore, the position of each cabinet can be adjusted as needed to adapt to different storage requirements and spatial layouts. In addition, the limiting mechanism prevents the rotatable cabinet 200 from over-rotating, reducing the risk of accidental collisions or damage.

[0076] Step 201 provides a third cabinet 203 and a first rotatable limiting component 101. The third cabinet 203 includes a first top plate 2031. A hole is drilled in the first top plate 2031 of the third cabinet 203 to form a first top plate hole 20310. The first top plate hole 20310 passes through the first top plate 2031 along the direction X from the first cabinet 201 to the third cabinet 203. The first top plate hole 20310 corresponds to the ball 3, the second bearing hole 122 and the first fastener 54 in the first rotatable limiting component 101.

[0077] Specifically, the aforementioned third cabinet 203 is the bottommost cabinet, and there is only one of it. A first top plate hole 20310 is pre-drilled in the first top plate 2031 of the bottommost cabinet. The position of the first top plate hole 20310 is ensured to correspond to the ball 3 of the first rotatable limiting member 101 and the nut 542 in the first fastener 54. The aforementioned direction X from the first cabinet 201 to the third cabinet 203 is the same as the direction X from the inner rotating disk 4 to the outer rotating disk 1.

[0078] The aforementioned drilling is to ensure that the first rotatable limiter 101 can be accurately installed on the third cabinet 203, and at the same time to provide an installation position for the subsequent ball bearing 3 and the first fastener 54. That is, the nut 542 in the first fastener 54 corresponds to the first top plate hole 20310 and can avoid the nut 542 in the first fastener 54.

[0079] Step 202 The third fastener 204 connects the first top plate 2031 to the rotating outer disk 1 in the first limitable rotating component 101 through the first top plate hole 20310, such as using 6 self-tapping screws to fix the rotating outer disk 1 in the first limitable rotating component 101 onto the first top plate 2031.

[0080] The aforementioned self-tapping screws are used to securely install the first rotatable limiting component 101 onto the third cabinet 203 to prevent it from loosening during use.

[0081] Step 203 provides a second cabinet 202 and a second rotatable retainer 102. The second cabinet 202 includes a second top plate 2021 and a first bottom plate 2022 arranged in parallel. Holes are drilled in the second top plate 2021 and the first bottom plate 2022 to form a second top plate hole 20210 and a first bottom plate hole 20220, respectively. Along the direction X from the first cabinet 201 to the third cabinet 203, the second top plate hole 20210 and the first bottom plate hole 20220 penetrate the second top plate 2021 and the first bottom plate 2022, respectively. The first bottom plate hole 20220 corresponds to the first rotatable retainer 102. The connecting hole 431 in the first cabinet 2021 and the second top plate hole 20210 correspond to the ball 3, the second bearing hole 122 and the first fastener 54 (such as the nut 542 in the first fastener 54) in the second rotatable component 102, so that the first bottom plate hole 20220 corresponds to the connecting hole 431 of the rotating inner disk 4 in the first rotatable component 101, and ensure that the second top plate hole 20210 of the second top plate 2021 in the second cabinet 202 corresponds to the ball 3, the second bearing hole 122 and the first fastener 54 (such as the nut 542 in the first fastener 54) in the second rotatable component 102.

[0082] The installation of the second cabinet 202 requires ensuring that the second top plate hole 20210 on the second top plate 2021 and the first bottom plate hole 20220 on the first bottom plate 2022 correspond to the positions of the second fastener 22 in the first rotatable limiting component 101, the ball bearing 3 in the second rotatable limiting component 102, and the nut 542 in the first fastener 54, so as to facilitate the subsequent fixing and rotation functions.

[0083] Step 204 The third fastener 204 connects the second top plate 2021 to the bearing part 12 of the rotating outer disk 1 in the second limitable rotating part 102 through the second top plate hole 20210. For example, the second top plate 2021 is fixed to the bearing part 12 of the rotating outer disk 1 in the second limitable rotating part 102 using 6 self-tapping screws.

[0084] Step 205 provides a first cabinet 201, which includes a second base plate 2011. A second base plate hole 20110 is formed by drilling a hole in the second base plate 2011. The second base plate hole 20110 passes through the second base plate 2011 along the direction X from the first cabinet 201 to the third cabinet 203. The second base plate hole 20110 corresponds to the connecting hole 431 in the second rotatable limiting component 102.

[0085] Specifically, the first cabinet 201 is the uppermost layer of the rotatable cabinet 200, and the second bottom plate hole 20110 on the second bottom plate 2011 corresponds to the connection hole 431 of the rotating inner disk 4 in the second rotatable component 102.

[0086] Step 206: The second fastener 22 and the fourth fastener 205 are threadedly connected to the first base plate 2022 and the connecting part 43 of the rotating inner disk 4 in the first rotatable limiting member 101 through the first base plate hole 20220; the second fastener 22 and the fourth fastener 205 are threadedly connected to the second base plate 2011 and the connecting part 43 of the rotating inner disk 4 in the second rotatable limiting member 102 through the second base plate hole 20110.

[0087] Specifically, the second fastener 22 (such as a locking screw) and the fourth fastener 205 (such as a locking nut) are used to connect the second base plate 2011 and the second rotating inner disk 4 of the second rotatable limiting component 102, thus completing the installation of the rotatable limiting cabinet 200. The locking nut is used to firmly connect the first cabinet 201 to the rotating inner disk 4 of the second rotatable limiting component 102, ensuring the stability of the entire rotatable limiting cabinet 200. It should be noted that in this embodiment, the locking screw and the locking nut are used together.

[0088] Optionally, step 207 provides drawers 206. Drawers 206 are installed on the first cabinet 201, second cabinet 202, and third cabinet 203 respectively, completing the assembly and testing the rotation effect to ensure the rotatable cabinet 200 can rotate normally and its limiting function is normal. Testing is conducted to ensure the quality of the entire assembly process, checking whether the rotatable cabinet 200 functions normally and whether the limiting is accurate. Through precise hole alignment and secure fixing, it is ensured that the rotatable component 100 can rotate normally in the rotatable cabinet 200 and achieve its limiting function. The installation of drawers 207 is an important part of the cabinet's function, ensuring that drawers 206 can slide and be used normally.

[0089] By adopting the above scheme, the second fastener 22, the third fastener 204 and the fifth fastener 205 securely connect the first cabinet 201, the second cabinet 202 and the third cabinet 203 to the rotatable limiter 100, which not only prevents the rotatable limiter cabinet 200 from loosening or being damaged during use, thereby improving the stability and safety of the rotatable limiter cabinet 200, but also enables the rotation function, increasing the flexibility of use and space utilization.

[0090] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A rotatable member with a position limit, characterized by, It includes a rotating outer disk, a limiting base, a ball bearing, a limiting component, and a rotating inner disk. The rotating outer disk and the rotating inner disk are parallel, with the rotating outer disk located below the rotating inner disk. The rotating outer disk is a first hollow disk structure. Along the radial direction of the first hollow disk structure, the first hollow disk structure includes a covering part, a first receiving part, and a supporting part connected in sequence. The orthographic projection of the covering part, the first receiving part, and the supporting part along the direction from the rotating inner disk to the rotating outer disk is annular. The first hollow disk structure has a first hollow part. The first receiving part is recessed to the side away from the rotating inner disk to form an arc surface. Along the direction from the rotating inner disk to the rotating outer disk, the cross-sectional shape of the covering part is a C-shaped structure, and the opening of the C-shaped structure faces the first hollow part. The cross-sectional shape of the supporting part is rectangular. The first hollow part is opened in the middle of the supporting part and penetrates the supporting part along the direction from the rotating inner disk to the rotating outer disk. The rotating inner disk is a second hollow disk structure. Along the radial direction of the second hollow disk structure, the second hollow disk structure includes a snap-fit ​​portion, a second receiving portion, and a connecting portion connected in sequence. The orthographic projections of the snap-fit ​​portion, the second receiving portion, and the connecting portion along the direction from the rotating inner disk to the rotating outer disk are all annular. The snap-fit ​​portion corresponds to the covering portion. Along the direction from the rotating inner disk to the rotating outer disk, the orthographic projection of the second receiving portion completely overlaps with the orthographic projection of the first receiving portion. The snap-fit ​​portion snaps into the C-shaped structure through the opening of the C-shaped structure. The second receiving portion protrudes away from the rotating outer disk to form an arc surface. A second hollow portion is provided on the connecting portion, penetrating the connecting portion along the direction from the rotating inner disk to the rotating outer disk. A receiving space with a circular cross-section is formed between the first receiving portion and the second receiving portion, and a metal ball is disposed within the receiving space. The limiting base is a first circular structure, which is connected to the bearing part near the connecting part. At least two ball bearings are provided on the first circular structure. The at least two ball bearings are arranged along the circumference of the first circular structure and the ball bearings pass through the first hollow part. The limiting member includes a first insertion part, a limiting part, and a second insertion part connected in sequence. The limiting part is a second circular structure with at least two first limiting holes. The at least two first limiting holes are arranged along the circumference of the second circular structure. The first limiting holes cooperate with the ball. The first insertion part and the second insertion part are both inserted into the gap between the bearing part and the connecting part. The first insertion part and the second insertion part are respectively fixedly connected to the corresponding connecting part. The connecting part rotates relative to the bearing part, and the ball is embedded in the first limiting hole.

2. The rotatable member of claim 1, wherein, A sound-absorbing pad is provided on the side of the limiting member away from the limiting base. The sound-absorbing pad is a circular pad, and the orthographic projection of the sound-absorbing pad is completely superimposed on the orthographic projection of the second circular structure along the direction from the inner rotating disk to the outer rotating disk. The edge of the circular pad has a notch corresponding to the first limiting hole. The notch is U-shaped and recessed towards the center of the circular pad.

3. The positionally limited rotator of claim 1, wherein, Along the direction from the inner rotating disk to the outer rotating disk, the orthographic projection of the first hollowed-out portion is located within the orthographic projection of the second hollowed-out portion.

4. The rotatable member of claim 3, wherein, The support portion is provided with a first support hole and a second support hole. The first support hole and the second support hole are respectively arranged around the first hollow portion. The second support hole is located near the first hollow portion of the first support hole. The first support hole and the second support hole penetrate the support portion along the direction from the inner rotating disk to the outer rotating disk. The connecting part is provided with a connecting hole that is arranged around the second hollow part. In the direction from the inner rotating disk to the outer rotating disk, the connecting hole passes through the connecting part, and the orthographic projection of the connecting hole does not overlap with the orthographic projection of the second bearing hole. The limiting base has a second limiting hole and a base hole. In the direction from the inner rotating disk to the outer rotating disk, the orthographic projection of the base hole completely overlaps with the orthographic projection of the second bearing hole, and the orthographic projection of the ball completely overlaps with the orthographic projection of the second limiting hole. The second limiting hole and the base hole pass through the limiting base in the direction from the inner rotating disk to the outer rotating disk.

5. The rotatable member of claim 4, wherein, The first bearing hole and the second bearing hole are both circular in shape, and the diameter of the first bearing hole is larger than the diameter of the second bearing hole.

6. The positionally limited rotator of claim 4, wherein, The limiting base and the bearing part are connected by a first fastener through the base hole and the second bearing hole.

7. The rotatable member of claim 4 wherein, The first plug-in portion and the second plug-in portion are arranged in a mirror symmetry. The shape of the first plug-in portion and the second plug-in portion is an arc trapezoid. The first plug-in portion and the second plug-in portion each include an upper bottom surface and a lower bottom surface. The lower bottom surface is located on the side of the upper bottom surface closer to the second circular structure. The lower bottom surface and the upper bottom surface are arc surfaces that bulge away from the second circular structure. Both the first insertion part and the second insertion part have insertion holes corresponding to the first bearing hole. The second insertion part and its corresponding connecting part are respectively connected with second fasteners, as are the first insertion part and its corresponding connecting part.

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