Rotary limiting mechanism and rotary table with working range exceeding + / -180 degrees

Abstract

The invention discloses a rotary limiting mechanism and a rotary table with a working range exceeding + / -180 degrees, aims to solve the problems that a limiting mechanism of the rotary table with the working range exceeding + / -180 degrees is complex in structure and high in cost and has potential safety hazards, and specifically comprises an arc-shaped guide rail fixedly mounted on the side wall of a fixed part around the rotating center of the rotary table and a sliding block mounted in the guide rail, the check block assembly is fixedly installed on the side wall of the rotating component, and the two glands are fixedly installed above the guide rail; the guide rail is provided with an arc-shaped sliding groove with an upward opening. The sliding block comprises a vertical rod and an arc-shaped first cross rod concentric with the guide rail; the first transverse rod is installed in the sliding groove. The lower end of the vertical rod is vertically and fixedly connected with the first cross rod, and the upper end corresponds to the acting end of the stop block assembly; the inner walls of the two ends of the sliding groove are each provided with a compression spring. One end of the compression spring abuts against the inner wall of the corresponding end of the sliding groove, and the other end abuts against the corresponding end of the first transverse rod. The two glands are located on the two sides of the vertical rod correspondingly and pressed above the opening of the sliding groove. And a rotating gap is formed between the two glands.

Description

Technical Field

[0001] The present invention relates to a turntable with a working range exceeding ±180°, and in particular to a rotation limiting mechanism and a turntable with a working range exceeding ±180°. Background Art

[0002] For turntables that rotate discontinuously, a limit mechanism is usually required to restrict their rotation range to prevent cable entanglement or other safety issues caused by continuous rotation. However, when the rotation range exceeds ±180°, simple stops are no longer sufficient. At this time, adding slip rings is too expensive. In addition to significantly increasing the structural complexity and cost, their inherent transmission performance also poses a significant safety hazard to the reliability of the entire machine. This requires careful consideration for spatial motion mechanisms. In general, when the rotation reaches the limit position, the drive mechanism is often unable to forcibly disconnect the power, resulting in prolonged stalling and electrical damage. Therefore, there is an urgent need to design a reliable rotation limit mechanism. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotation limiting mechanism and a turntable with a working range exceeding ±180°, so as to solve the technical problems that the limiting mechanism of the turntable with a working range exceeding ±180° has a complex structure, high cost and potential safety hazards.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A rotation limit mechanism for a turntable with an operating range exceeding ±°, comprising a fixed component and a rotating component, wherein the rotating component is disposed on the fixed component and is characterized in that it comprises an arc-shaped guide rail fixedly mounted on the side wall of the fixed component about the center of rotation of the turntable, a slider mounted within the guide rail, a stopper assembly fixedly mounted on the side wall of the rotating component, and two glands fixedly mounted above the guide rail;

[0006] The guide rail is provided with an arc-shaped sliding groove opening upward along its arc length direction;

[0007] The slider includes a vertical rod and a first arc-shaped crossbar concentric with the guide rail; the first crossbar is installed in the slide groove, and its outer wall is clearance-matched with the inner wall of the slide groove; the lower end of the vertical rod is vertically fixedly connected to the upper end surface of the first crossbar, and its upper end corresponds to the active end of the stopper assembly; a compression spring is respectively provided on the inner wall of each end of the slide groove; one end of the compression spring abuts against the inner wall of the corresponding end of the slide groove, and the other end abuts against the corresponding end of the first crossbar;

[0008] The two pressure covers are respectively located on both sides of the vertical rod and are press-fitted above the slide slot opening to limit the first crossbar in the vertical direction; a rotation gap is provided between the two pressure covers to allow the vertical rod to swing between the two pressure covers.

[0009] Further, it further includes two Hall components symmetrically arranged on both sides of the vertical rod and communicatively connected to the control system of the turntable;

[0010] Each of the Hall components includes a U-shaped bracket with an opening facing downward, a Hall arranged at the top of the U-shaped bracket, and a permanent magnet;

[0011] One first notch is respectively arranged on both sides of each gland; both ends of the U-shaped bracket respectively pass through the two first notches from above the corresponding gland and are fixedly connected to both sides of the guide rail;

[0012] The slider further includes an arc-shaped second cross bar concentric with the guide rail; the middle of the second cross bar is perpendicularly connected to the middle of the vertical rod, so that both ends thereof are respectively located on both sides of the vertical rod, and both ends are respectively located above the corresponding two glands and two U-shaped brackets;

[0013] The permanent magnet is arranged on the second cross bar and cooperates with the Hall on the same side of the vertical rod for electrical limiting.

[0014] Further, a buffer pad is further arranged between the inner wall where the compression spring abuts against the chute;

[0015] Both ends of the first cross bar are provided with protrusions, and the outer wall size of the protrusions matches the inner wall size of the compression spring, so that when the first cross bar contacts the compression spring, the protrusions can extend into the corresponding compression spring for guiding and positioning.

[0016] Further, one second notch is respectively arranged on the side walls at both ends of the second cross bar;

[0017] The two permanent magnets are respectively installed in the two second notches.

[0018] Further, the vertical rod, the first cross bar and the second cross bar are integrally arranged.

[0019] Further, the buffer pad is a rubber pad.

[0020] Further, the stopper assembly includes a triangular bracket with a vertex facing downward and a stopper arranged at the vertex of the triangular bracket;

[0021] The triangular bracket is fixedly connected to the rotating part;

[0022] The side wall of the stopper corresponds to the side wall of the vertical rod.

[0023] Further, a reinforcing rod is arranged in the triangular bracket;

[0024] One end of the reinforcing rod is fixedly connected to the vertex of the triangular bracket, and the other end is perpendicularly connected to the bottom edge of the triangular bracket.

[0025] Further, the triangular bracket, the reinforcing rod and the stopper are integrally provided.

[0026] A turntable with a working range exceeding ±°, comprising a fixed component and a rotating component, wherein the rotating component is arranged on the fixed component, and the special feature is that: the above-mentioned rotation limiting mechanism is further included.

[0027] Advantages of the present invention:

[0028] 1. The rotation limiting mechanism provided by the present invention is composed of common structural parts and compression springs, etc., and is convenient and fast for processing and assembly, with a simple and reliable structure.

[0029] 2. The rotation limiting mechanism provided by the present invention simultaneously has the functions of electrical limiting and mechanical limiting, with a small size and high integration degree, and is convenient for use in spatial motion mechanisms.

[0030] 3. The rotation limiting mechanism provided by the present invention has an elastic buffering effect to prevent rigid impacts. At the same time, the bidirectional compression spring can ensure that the slider is in the initial zero position state when not working, preventing mis-triggering of electrical signals or inability to release after triggering.

[0031] 4. The rotation limiting mechanism provided by the present invention can be installed outside the turntable, which is convenient for debugging. Description of the drawings

[0032] Figure 1 is a schematic structural diagram of an embodiment of a rotation limiting mechanism of the present invention;

[0033] Figure 2 is a schematic structural diagram when the stopper assembly in the embodiment of the present invention rotates to one side extreme position of the guide rail;

[0034] Figure 3 is a schematic structural diagram when the stopper assembly in the embodiment of the present invention rotates to the other side extreme position of the guide rail.

[0035] Reference numerals in the drawings:

[0036] 1 - Fixed component, 2 - Rotating component, 3 - Guide rail, 4 - Slider, 41 - Vertical rod, 42 - First cross bar, 43 - Second cross bar, 5 - Stopper assembly, 51 - Triangular bracket, 52 - Stopper, 53 - Reinforcing rod, 6 - gland, 7 - Compression spring, 8 - Hall assembly, 81 - U-shaped bracket, 82 - Hall, 83 - Magnet, 9 - Buffer pad. Detailed implementation manners

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] A rotation limiting mechanism provided by an embodiment of the present invention is used for a turntable with a working range exceeding ±180°, which includes a fixed component 1 and a rotating component 2, as Figure 1 shown: It includes an arc-shaped guide rail 3 fixedly installed on the side wall of the fixed component 1 around the rotation center of the turntable, an arc-shaped slider 4 installed in the guide rail 3, a stopper assembly 5 fixedly installed on the side wall of the rotating component 2, and two gland covers 6 fixedly installed above the guide rail 3; it also includes two Hall components 8 symmetrically arranged on both sides of the vertical rod 41 and communicatively connected to the control system of the turntable;

[0039] An arc-shaped chute with an upward opening is arranged on the guide rail 3 along the arc length direction thereof;

[0040] The slider 4 includes a vertical rod 41 and arc-shaped first cross bar 42 and second cross bar 43; the arc centers of the arc-shaped guide rail 3, the first cross bar 42, and the second cross bar 43 are the same, and the three are integrally arranged; the first cross bar 42 is horizontally installed in the chute, and the outer wall thereof is in clearance fit with the inner wall of the chute; the lower end of the vertical rod 41 is perpendicularly fixed to the upper end surface of the first cross bar 42, and the upper end thereof corresponds to the acting end of the stopper assembly 5; a compression spring 7 is respectively arranged on the inner walls at both ends of the chute; one end of the compression spring 7 abuts against the corresponding inner wall of the chute, and the other end abuts against the corresponding end of the first cross bar 42; a buffer pad 9 is also arranged between each compression spring 7 and the corresponding inner wall of the chute in contact; the buffer pad 9 can be made of a rubber pad. Protrusions are arranged at both ends of the first cross bar 42, and the outer wall dimensions of the protrusions match the inner wall dimensions of the compression spring 7, so that when the first cross bar 42 contacts the compression spring 7, the protrusions can extend into the corresponding compression spring 7 for guiding and positioning, and the compression spring 7 and the rubber pad play a role in maintaining the initial zero position and elastic buffering. The middle of the second cross bar 43 is perpendicularly connected to the middle of the vertical rod 41. Second notches are respectively arranged on the side walls at both ends of the second cross bar 43.

[0041] The two gland covers 6 are respectively located on both sides of the vertical rod 41 and are pressed above the opening of the chute, used to limit the first cross bar 42 in the vertical direction to prevent the first cross bar 42 from slipping out of the chute, and can also rotate in the chute; a rotation gap is arranged between the two gland covers 6 for the vertical rod 41 to swing between the two gland covers 6. A first notch is respectively arranged on both sides of each gland cover 6.

[0042] Each Hall assembly 8 includes a U-shaped bracket 81 with an opening downward, a Hall 82 arranged on the top of the U-shaped bracket 81, and a magnet 83; the two ends of the U-shaped bracket 81 pass through the two first notches above the corresponding pressure cover 6 and are fixedly connected to the two sides of the guide rail 3; the two ends of the second cross bar 43 are respectively located on both sides of the vertical bar 41, and the two ends are respectively located above the corresponding two pressure covers 6 and the two U-shaped brackets 81; the two magnets 83 are respectively installed in the two second notches, and respectively cooperate with the Hall 82 located on the same side of the vertical bar 41 to limit the position, thereby playing an electrical limit protection role.

[0043] The stopper assembly 5 comprises a triangular bracket 51 with its apex facing downward, and a stopper 52 positioned at the apex of the bracket 51. The triangular bracket 51 is fixedly connected to the rotating component 2; the sidewalls of the stopper 52 correspond to the sidewalls of the vertical rod 41. A reinforcing rod 53 is positioned within the triangular bracket; one end of the reinforcing rod 53 is fixedly connected to the apex of the bracket 51, and the other end is perpendicularly connected to the base of the bracket 51. The triangular bracket 51, reinforcing rod 53, and stopper 52 are integrated.

[0044] During the rotation process, the block 52 rotates with the rotating component 2. When it contacts the slider 4, it pushes the slider 4 to slide circumferentially in the guide groove of the guide rail 3. When the magnet 83 reaches above the Hall 82, the electric limit signal is first triggered. At this time, the control system of the turntable controls the driving rotation mechanism to cut off the power. Then, under the action of inertia, the rotating component 2 continues to rotate, and the slider 4 continues to squeeze the compression spring 7 until the top of the first cross bar 42 contacts the rubber pad, completing the buffering mechanical limit. The compression spring 7 then rebounds, pushing the slider 4 and the rotating component 2 back to the initial zero position and maintains it, releasing the electric limit signal, and the system resumes normal operation. The principle is the same for reverse rotation. The two extreme positions are as follows Figure 2 and Figure 3 The rotation limit mechanism can achieve an electrical limit of ±182° and a mechanical limit of ±185°. In actual use, the limit range can be expanded according to specific usage requirements. The turntable with a working range exceeding ±180° provided in this embodiment includes a fixed component, a rotating component, and the above-mentioned rotation limit mechanism.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A rotation limiting mechanism for a turntable with a working range exceeding ±180°, which includes a fixed component (1) and a rotating component (2), the rotating component (2) is arranged on the fixed component (1), and is characterized in that: It includes an arc-shaped guide rail (3) fixedly installed on the side wall of the fixed component (1) around the rotation center of the turntable, a slider (4) installed in the guide rail (3), a stopper assembly (5) fixedly installed on the side wall of the rotating component (2), and two gland covers (6) fixedly installed above the guide rail (3); An arc-shaped chute with an upward opening is arranged along the arc length direction of the guide rail (3); The slider (4) includes a vertical rod (41) and an arc-shaped first cross bar (42) concentric with the guide rail (3); the first cross bar (42) is installed in the chute, and the outer wall thereof is in clearance fit with the inner wall of the chute; the lower end of the vertical rod (41) is perpendicularly and fixedly connected to the upper end surface of the first cross bar (42), and the upper end thereof corresponds to the acting end of the stopper assembly (5); a compression spring (7) is respectively arranged on the inner walls at both ends of the chute; one end of the compression spring (7) abuts against the corresponding inner wall of the chute, and the other end abuts against the corresponding end of the first cross bar (42); The two gland covers (6) are respectively located on both sides of the vertical rod (41) and are pressed above the opening of the chute for vertically limiting the first cross bar (42); a rotation gap is arranged between the two gland covers (6) for allowing the vertical rod (41) to swing between the two gland covers (6).

2. The rotation limiting mechanism according to claim 1, characterized in that: It further includes two Hall components (8) symmetrically arranged on both sides of the vertical rod (41) and communicatively connected to the control system of the turntable; Each Hall component (8) includes a U-shaped bracket (81) with a downward opening, a Hall (82) arranged at the top of the U-shaped bracket (81), and a permanent magnet (83); A first notch is respectively arranged on both sides of each gland cover (6); both ends of the U-shaped bracket (81) pass through the two first notches from above the corresponding gland cover (6) and are fixedly connected to both sides of the guide rail (3); The slider (4) further includes an arc-shaped second cross bar (43) concentric with the guide rail (3); the middle of the second cross bar (43) is perpendicularly connected to the middle of the vertical rod (41), so that both ends thereof are respectively located on both sides of the vertical rod (41) and are respectively located above the corresponding two gland covers (6) and the two U-shaped brackets (81); The permanent magnet (83) is arranged on the second cross bar (43) and cooperates with the Hall (82) on the same side as the vertical rod (41) for electrical limiting.

3. The rotational limit mechanism according to claim 2, characterized in that: A buffer pad (9) is further arranged between the inner wall of the compression spring (7) in contact with the chute; Protrusions are arranged at both ends of the first cross bar (42), and the outer wall dimensions of the protrusions match the inner wall dimensions of the compression spring (7), so that when the first cross bar (42) contacts the compression spring (7), the protrusions can extend into the corresponding compression spring (7) for guiding and positioning.

4. The rotation limit mechanism according to claim 3, characterized in that: A second notch is respectively arranged on the side walls at both ends of the second cross bar (43); The two permanent magnets (83) are respectively installed in the two second notches.

5. The rotational limit mechanism according to claim 4, characterized in that: The vertical rod (41), the first cross bar (42), and the second cross bar (43) are integrally arranged; 6. The rotational limit mechanism according to claim 5, wherein: The buffer pad (9) is a rubber pad.

7. The rotation limiting mechanism according to any one of claims 1-6, characterized in that: The stopper assembly (5) includes a triangular bracket (51) with a downward vertex and a stopper (52) arranged at the vertex of the triangular bracket (51); The triangular bracket (51) is fixedly connected to the rotating member (2); The side wall of the stopper (52) corresponds to the side wall of the vertical rod (41).

8. The rotational limit mechanism according to claim 7, wherein: A reinforcing rod (53) is provided inside the triangular bracket; One end of the reinforcing rod (53) is fixedly connected to the vertex of the triangular bracket (51), and the other end is perpendicularly connected to the bottom edge of the triangular bracket (51).

9. The rotational limit mechanism according to claim 8, wherein: The triangular bracket (51), the reinforcing rod (53) and the stopper (52) are integrally provided.

10. A turntable with a working range of more than ±180°, comprising a fixed part (1) and a rotating part (2), the rotating part (2) being arranged on the fixed part (1), characterized in that: It further includes the rotation limiting mechanism according to any one of claims 1-9.

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