Coaxiality adjusting device and encoder
By designing a coaxiality adjustment device and a precise calibration method, the problem of decreased accuracy of the rotary encoder was solved, and the positioning accuracy of the pan/tilt head was improved.
Patent Information
- Application Number
- CN202422668464.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The accuracy of existing rotary encoders gradually decreases during use, resulting in reduced pan/tilt position positioning accuracy.
A coaxiality adjustment device is designed, which includes a stator bracket, a rotor bracket, a first coaxiality adjustment bracket and a second coaxiality adjustment bracket. The coaxiality of the stator encoding plate and the rotor encoding plate is adjusted by rotation, and precise calibration and adjustment are performed in combination with a laser transmitter and receiver, a parallel light source and a camera unit.
The encoding accuracy between the stator encoding plate and the rotor encoding plate is improved, and the positioning accuracy of the pan/tilt is improved.
Smart Images
Figure CN223428292U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of encoders, in particular to a coaxiality adjustment device and an encoder. Background Art
[0002] PTZ cameras are equipped with a rotary encoder, which consists of a stator encoder plate and a rotor encoder plate. As the PTZ rotates, the rotor encoder plate also rotates, transmitting electrical signals between the two plates to determine the PTZ's position. However, the accuracy of existing rotary encoders decreases over time, leading to a decrease in the accuracy of PTZ positioning and reducing the effectiveness of backend control. Utility Model Content
[0003] Based on this, it is necessary to provide a coaxiality adjustment device and an encoder to address the problem of gradually decreasing encoding accuracy of the encoder.
[0004] A coaxiality adjustment device, comprising:
[0005] A stator bracket, which is used to install a stator encoding plate;
[0006] A rotor bracket, which is used to install a rotor encoder plate;
[0007] a first coaxiality adjustment bracket, on which the rotor bracket is rotatably mounted; and
[0008] A second coaxiality adjustment bracket, wherein the first coaxiality adjustment bracket is rotatably arranged on the second coaxiality adjustment bracket, and the second coaxiality adjustment bracket is rotatably arranged on the stator bracket to allow the rotor bracket and / or the first coaxiality adjustment bracket to adjust the coaxiality of the stator code plate and the rotor code plate by rotation.
[0009] The rotor bracket of the present invention is rotatably arranged on the first coaxiality adjustment bracket via a first rotating shaft, and the first coaxiality adjustment bracket is rotatably arranged on the second coaxiality adjustment bracket via a second rotating shaft, and the first rotating shaft is perpendicular to the second rotating shaft.
[0010] The second coaxiality adjustment bracket of the present invention is rotatably arranged on the stator bracket via a third rotating shaft, and the third rotating shaft is perpendicular to the second rotating shaft.
[0011] The third rotating shaft of the present invention is fixed on the stator bracket, and a bearing is provided between the second coaxiality adjustment bracket and the third rotating shaft.
[0012] An encoder comprises a stator encoding plate, a rotor encoding plate and the coaxial degree adjusting device, the stator encoding plate is installed on the stator support, the rotor encoding plate is installed on the rotor support, and the stator encoding plate and the rotor encoding plate are oppositely arranged.
[0013] The encoder further comprises a laser transmitter and a laser receiver, one of the laser transmitter and the laser receiver is installed on the second coaxial degree adjusting support, and the other is installed on the stator support, so as to allow the laser receiver to receive the laser signal emitted by the laser transmitter.
[0014] The laser transmitter is magnetically attracted on the second coaxial degree adjusting support or the stator support.
[0015] The stator encoding plate is provided with a first inner hole in the middle, the rotor encoding plate is provided with a second inner hole in the middle, and the first inner hole and the second inner hole are oppositely arranged.
[0016] The coaxial degree adjusting device further comprises a parallel light source, the parallel light source is installed on the stator support, the parallel light source is located on the side of the second inner hole away from the first inner hole and is oppositely arranged with the first inner hole, and the aperture of the second inner hole is larger than that of the first inner hole.
[0017] The coaxial degree adjusting device further comprises a camera unit, and the camera unit is installed on the parallel light source.
[0018] The beneficial effects of the utility model are as follows:
[0019] The stator encoding plate is installed on the stator support, the rotor encoding plate is installed on the rotor support, and the stator encoding plate and the rotor encoding plate can be oppositely arranged under the connection of the first coaxial degree adjusting support and the second coaxial degree adjusting support. On this basis, the rotor encoding plate is allowed to rotate relative to the stator encoding plate through the rotatable design of the second coaxial degree adjusting support on the stator support, so that the stator encoding plate can encode the rotation angle of the rotor encoding plate.
[0020] Further, the parallelism between the rotor encoding plate and the stator encoding plate can be improved through the rotation of the rotor support on the first coaxial degree adjusting support and / or the rotation of the first coaxial degree adjusting support on the second coaxial degree adjusting support, so as to improve the coaxial degree of the stator encoding plate and the rotor encoding plate. Correspondingly, the encoding accuracy of the stator encoding plate to the rotation angle of the rotor encoding plate is also improved during the rotation of the rotor encoding plate relative to the stator encoding plate. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1This is a schematic diagram of a partial three-dimensional structure of an encoder in an embodiment of the present utility model;
[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the encoder in the embodiment of the present utility model;
[0023] Figure 3 This is a schematic diagram of the main structure of the encoder in the embodiment of the present utility model;
[0024] Figure 4 This is a schematic diagram of the exploded structure of the encoder in the embodiment of the present utility model;
[0025] Figure 5 Schematic diagram of the cross-sectional structure of the encoder in the embodiment of the present utility model.
[0026] Reference numerals:
[0027] 1. Stator bracket; 11. Third rotating shaft; 111. Bearing; 12. First frame; 13. Second frame; 14. Third frame; 2. Stator code plate; 21. First inner hole; 3. Rotor bracket; 31. First rotating shaft; 4. Rotor code plate; 41. Second inner hole; 5. First coaxiality adjustment bracket; 51. Second rotating shaft; 6. Second coaxiality adjustment bracket; 61. Fourth frame; 62. Fifth frame; 7. Laser transmitter; 8. Laser receiver; 9. Parallel light source; 10. Camera unit. DETAILED DESCRIPTION
[0028] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.
[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.
[0034] Example:
[0035] See also Figure 1-Figure 5 This embodiment provides an encoder, including a stator code plate 2, a rotor code plate 4, and a coaxiality adjustment device. The coaxiality adjustment device includes a stator bracket 1, a rotor bracket 3, a first coaxiality adjustment bracket 5, and a second coaxiality adjustment bracket 6.
[0036] In this embodiment, the stator bracket 1 includes a first frame 12, a second frame 13, and a third frame 14. The first frame 12 is fixed to the second frame 13 via the third frame 14, and the stator code plate 2 is fixedly mounted on the first frame 12. In some other embodiments, the stator bracket 1 may include only the first frame 12, or only the first frame 12 and the second frame 13. That is, the second frame 13 and the third frame 14 are optional structures for the stator bracket 1.
[0037] In this embodiment, the rotor code plate 4 is mounted on the rotor bracket 3. A first rotating shaft 31 is fixedly mounted on the rotor bracket 3. In other embodiments, the first rotating shaft 31 can also be fixedly mounted on the first coaxiality adjustment bracket 5. The rotor bracket 3 is rotatably mounted on the first coaxiality adjustment bracket 5 via the first rotating shaft 31.
[0038] The second coaxiality adjustment bracket 6 includes a fourth frame 61 and a fifth frame 62, wherein the fourth frame 61 is fixed to the fifth frame 62. In this embodiment, the first coaxiality adjustment bracket 5 is fixedly provided with the second rotating shaft 51. In other embodiments, the second rotating shaft 51 may also be fixedly provided on the fourth frame 61, and the first coaxiality adjustment bracket 5 is rotatably provided on the fourth frame 61 via the second rotating shaft 51.
[0039] In this embodiment, the third rotating shaft 11 is fixedly mounted on the first frame 12. In other embodiments, the third rotating shaft 11 may also be fixedly mounted on the fifth frame 62. The fifth frame 62 is rotatably mounted on the first frame 12 via the third rotating shaft 11.
[0040] Thus, through the coordination of the stator bracket 1, the rotor bracket 3, the first coaxiality adjustment bracket 5, and the second coaxiality adjustment bracket 6, the stator code plate 2 and the rotor code plate 4 can be substantially coaxial and arranged relative to each other. The rotor code plate 4 can rotate about the third rotating shaft 11 via the second coaxiality adjustment bracket 6, thereby rotating relative to the stator code plate 2, allowing the stator code plate 2 to encode the rotation angle and position of the rotor code plate 4.
[0041] In order to reduce the resistance when the rotor code plate 4 rotates around the axis of the third rotating shaft 11 , a bearing 111 is provided between the second coaxiality adjustment bracket 6 and the third rotating shaft 11 .
[0042] The degree of coaxiality between the stator code plate 2 and the rotor code plate 4 is crucial to encoding accuracy. Insufficient coaxiality between the stator code plate 2 and the rotor code plate 4 will cause additional errors in the encoding process of the rotor code plate 4's rotation angle by the stator code plate 2. As the rotation angle of the rotor code plate 4 increases, these errors will continue to accumulate, ultimately leading to a continuously increasing deviation between the actual rotation angle of the rotor code plate 4 and the encoding angle of the stator code plate 2.
[0043] In this embodiment, the first rotating shaft 31 is inclined relative to the second rotating shaft 51, and the third rotating shaft 11 is inclined relative to the second rotating shaft 51. Therefore, by rotating the rotor bracket 3 on the first coaxiality adjustment bracket 5 and / or rotating the first coaxiality adjustment bracket 5 on the second coaxiality adjustment bracket 6, the installation angle of the rotor code plate 4 can be adjusted, and the parallelism between the rotor code plate 4 and the stator code plate 2 can be improved, thereby effectively improving the coaxiality of the stator code plate 2 and the rotor code plate 4, and increasing the encoding accuracy of the stator code plate 2 to the rotation angle of the rotor code plate 4.
[0044] Further preferably, the first rotating shaft 31 is perpendicular to the second rotating shaft 51 , and the third rotating shaft 11 is perpendicular to the second rotating shaft 51 .
[0045] After the coaxiality adjustment between the stator code plate 2 and the rotor code plate 4 is completed, the rotor bracket 3 can be locked on the first coaxiality adjustment bracket 5 by the locking screw, and the first coaxiality adjustment bracket 5 can be locked on the second coaxiality adjustment bracket 6 at the same time. At this time, only the second coaxiality adjustment bracket 6 is allowed to rotate on the stator bracket 1.
[0046] To verify the coaxiality adjustment between the stator encoder plate 2 and the rotor encoder plate 4, the encoder also includes a laser transmitter 7 and a laser receiver 8. In this embodiment, the laser transmitter 7 is magnetically mounted on the second coaxiality adjustment bracket 6, and the laser receiver 8 is mounted on the stator bracket 1. More specifically, the laser transmitter 7 is mounted on the fifth frame 62, and the laser receiver 8 is mounted on the second frame 13. In other embodiments, the positions of the laser transmitter 7 and the laser receiver 8 can be interchanged.
[0047] When the rotor code plate 4 is not rotating, its actual rotation angle is 0°, and the coding angle of the stator code plate 2 is also 0°. At this time, the laser receiver 8 and the laser transmitter 7 are opposite, and the laser receiver 8 can just receive the laser signal emitted by the laser transmitter 7.
[0048] Accordingly, when the actual number of revolutions of the rotor code plate 4 is non-integer, the laser receiver 8 and the laser transmitter 7 are offset, and the laser receiver 8 cannot receive the laser signal emitted by the laser transmitter 7. When the actual number of revolutions of the rotor code plate 4 is an integer, the laser receiver 8 and the laser transmitter 7 can be arranged relative to each other. Therefore, by coordinating the laser receiver 8 and the laser transmitter 7, the actual number of revolutions of the rotor code plate 4 can be controlled to be exactly the integer n. Accordingly, the actual rotation angle of the rotor code plate 4 is 2πn. At this time, by reading the encoding angle of the stator code plate 2 and comparing it with 2πn, it is possible to confirm whether the encoding accuracy of the stator code plate 2 meets the requirements, and thus determine the coaxiality adjustment effect between the stator code plate 2 and the rotor code plate 4. If the encoding accuracy of the stator code plate 2 does not meet the requirements, the coaxiality between the stator code plate 2 and the rotor code plate 4 is readjusted.
[0049] In this embodiment, a first inner hole 21 is defined in the center of the stator code plate 2, and a second inner hole 41 is defined in the center of the rotor code plate 4. The first inner hole 21 and the second inner hole 41 are disposed opposite each other. Before accurately verifying the coaxiality between the stator code plate 2 and the rotor code plate 4 using the laser receiver 8 and the laser transmitter 7, a rough assessment of the coaxiality between the stator code plate 2 and the rotor code plate 4 can be made by observing the coaxiality between the first inner hole 21 and the second inner hole 41.
[0050] To facilitate the determination of the coaxiality between the first inner hole 21 and the second inner hole 41, the coaxiality adjustment device further includes a parallel light source 9 and a camera unit 10. The parallel light source 9 is mounted on the stator bracket 1, and the camera unit 10 is mounted on the parallel light source 9. Both the parallel light source 9 and the camera unit 10 are located on the side of the second inner hole 41 facing away from the first inner hole 21. Both the parallel light source 9 and the camera unit 10 are disposed opposite the first inner hole 21, and the aperture of the second inner hole 41 is larger than that of the first inner hole 21.
[0051] The parallel light source 9 can allow parallel light to pass through the second inner hole 41 and illuminate the first inner hole 21, and the camera unit 10 can image the edge of the first inner hole 21. By judging whether the edge of the first inner hole 21 is blocked by the second inner hole 41, a rough judgment of the coaxiality between the stator code plate 2 and the rotor code plate 4 can be achieved.
[0052] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0053] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.
Claims
1. A coaxiality adjustment device, characterized in that: include: A stator bracket (1), wherein the stator bracket (1) is used to install a stator encoding plate (2); A rotor bracket (3), wherein the rotor bracket (3) is used to install a rotor encoding plate (4); a first coaxiality adjustment bracket (5), the rotor bracket (3) being rotatably mounted on the first coaxiality adjustment bracket (5); and A second coaxiality adjustment bracket (6), wherein the first coaxiality adjustment bracket (5) is rotatably arranged on the second coaxiality adjustment bracket (6), and the second coaxiality adjustment bracket (6) is rotatably arranged on the stator bracket (1), so as to allow the rotor bracket (3) and / or the first coaxiality adjustment bracket (5) to adjust the coaxiality of the stator code plate (2) and the rotor code plate (4) by rotation.
2. The coaxiality adjustment device according to claim 1, characterized in that: The rotor bracket (3) is rotatably arranged on the first coaxiality adjustment bracket (5) via a first rotating shaft (31), and the first coaxiality adjustment bracket (5) is rotatably arranged on the second coaxiality adjustment bracket (6) via a second rotating shaft (51), wherein the first rotating shaft (31) is perpendicular to the second rotating shaft (51).
3. The coaxiality adjustment device according to claim 2, characterized in that: The second coaxiality adjustment bracket (6) is rotatably arranged on the stator bracket (1) via a third rotating shaft (11), and the third rotating shaft (11) is perpendicular to the second rotating shaft (51).
4. The coaxiality adjustment device according to claim 3, characterized in that: The third rotating shaft (11) is fixed on the stator bracket (1), and a bearing (111) is provided between the second coaxiality adjustment bracket (6) and the third rotating shaft (11).
5. An encoder, characterized in that The invention comprises a stator code plate (2), a rotor code plate (4) and a coaxiality adjustment device according to any one of claims 1 to 4, wherein the stator code plate (2) is mounted on the stator bracket (1), the rotor code plate (4) is mounted on the rotor bracket (3), and the stator code plate (2) and the rotor code plate (4) are arranged relative to each other.
6. The encoder according to claim 5, characterized in that The encoder further comprises a laser transmitter (7) and a laser receiver (8), one of the laser transmitter (7) and the laser receiver (8) being mounted on the second coaxiality adjustment bracket (6), and the other being mounted on the stator bracket (1) to allow the laser receiver (8) to receive the laser signal emitted by the laser transmitter (7).
7. The encoder according to claim 6, characterized in that The laser emitter (7) is magnetically attracted to the second coaxiality adjustment bracket (6) or the stator bracket (1).
8. The encoder according to claim 5, wherein A first inner hole (21) is provided in the middle of the stator encoding plate (2), and a second inner hole (41) is provided in the middle of the rotor encoding plate (4), wherein the first inner hole (21) and the second inner hole (41) are arranged opposite to each other.
9. The encoder according to claim 8, wherein The coaxiality adjustment device further comprises a parallel light source (9), which is mounted on the stator bracket (1), and is located on a side of the second inner hole (41) facing away from the first inner hole (21) and is arranged opposite to the first inner hole (21), and the aperture of the second inner hole (41) is larger than the aperture of the first inner hole (21).
10. The encoder according to claim 9, characterized in that The coaxiality adjustment device further comprises a camera unit (10), and the camera unit (10) is mounted on the parallel light source (9).