Coarse and fine adjustment combined knob device and method

Abstract

The invention provides a knob device and method combining coarse adjustment and fine adjustment, and relates to the technical field of precise instrument positioning adjustment, the knob device comprises a fine adjustment hand knob, a coarse adjustment hand knob, a fixed gear ring, a planetary gear train, an output shaft and an output gear ring, the fixed gear ring is installed on the coarse adjustment hand knob, and the planetary gear train is connected with the fine adjustment hand knob; the fixed gear ring and the output gear ring are both in meshing transmission with a planetary gear on the planetary gear train, two modes of rapid rough positioning and fine adjustment positioning are achieved, so that the device is rapidly and accurately adjusted to a designated position, the device is compact in structure and small in occupied space, and tooth difference exists between the fixed gear ring and the output gear ring; the transmission ratio difference is achieved through meshing dislocation caused by the tooth number difference so as to achieve the purpose of speed reduction and accurate adjustment, and the technical problem that an existing adjusting device is difficult to take the occupied space, the adjusting efficiency and the adjusting precision into consideration is solved.

Description

Technical Field

[0001] This invention relates to the field of precision instrument positioning and adjustment technology, specifically to a knob device and method that combines coarse and fine adjustment. Background Technology

[0002] With the development of science and technology, the problem of rapid and accurate positioning has become increasingly important in fields such as processing and microscopic inspection. In particular, the rapid and accurate positioning of the stage in processing worktables and microscope observation can not only improve the efficiency and accuracy of processing and positioning, but also quickly and accurately position the stage to the target position in microscope observation, saving time in the microscope observation process, and ensuring precise adjustment to the designated observation position.

[0003] Traditional angular displacement adjustment devices are mainly divided into two types: electric and manual. Electric devices are mostly controlled by servo motors or stepper motors through driver controllers. Higher-level devices even require encoder semi-closed-loop control and closed-loop control. However, although electric devices can achieve high positioning accuracy and resolution, they are also very expensive, require a large number of electrical control components, and have complicated wiring layouts that take up a lot of space. This is especially true in scenarios with limited space and environment, which seriously affects their use. Ordinary manual adjustment is mostly unilateral deceleration adjustment, which is slow, inefficient, and has limited adjustment accuracy, making it difficult to meet the needs of high-precision application scenarios. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a knob device and method that combines coarse and fine adjustment.

[0005] A rotary device combining coarse and fine adjustment includes a fine adjustment knob and a coarse adjustment knob, which are coaxially arranged. A fixed gear ring is mounted on the coarse adjustment knob. The rotary device also includes a planetary gear train and an output shaft. The planetary gear train is connected to the fine adjustment knob. An output gear ring is provided on the output shaft near the end of the fine adjustment knob. Both the fixed gear ring and the output gear ring mesh with the planetary gears on the planetary gear train, and there is a tooth difference between the fixed gear ring and the output gear ring.

[0006] Furthermore, the planetary gear train also includes a spindle, a front cover, and a rear cover, with the front cover and the rear cover both mounted on the spindle, and the planetary gears mounted between the front cover and the rear cover.

[0007] Furthermore, the knob device also includes a connecting key and a second screw. The fine-tuning knob is connected to the spindle via the second screw, and the connecting key is located on the spindle and the fine-tuning knob.

[0008] Furthermore, the knob device also includes a fixing sleeve, which is mounted on the spindle and located between the rear end cover and the fine adjustment knob. The fixing sleeve is connected to the fixing gear ring and the coarse adjustment knob.

[0009] Furthermore, the knob device also includes an inner shaft system, which includes a fourth bearing and a fifth bearing. The inner rings of the fourth bearing and the fifth bearing are both installed in conjunction with the output shaft, and the outer rings of the fourth bearing and the fifth bearing are both installed in conjunction with the coarse adjustment knob.

[0010] Furthermore, the knob device also includes an outer shaft system, which includes a fixed outer sleeve and a third bearing. The inner ring of the third bearing is fitted with the coarse adjustment knob, and the outer ring of the third bearing is fitted with the fixed outer sleeve.

[0011] Furthermore, the output gear ring and the fixed gear ring are coaxially arranged.

[0012] Furthermore, the planetary gear train also includes a first bearing and a second bearing. The inner ring of the first bearing is mounted on one end of the spindle, and the inner ring of the second bearing is mounted on the other end of the spindle. The outer ring of the first bearing is fitted with the output shaft, and the outer ring of the second bearing is fitted with the fixed pressure sleeve.

[0013] Furthermore, the knob device also includes a bushing mounted on the output shaft and in contact with the first bearing.

[0014] The present invention also includes a method for coarse and fine adjustment, which is based on a knob device for coarse and fine adjustment as described in any of the preceding claims, and includes the following steps: Step S1: Make a rough adjustment of the angular displacement by turning the coarse adjustment knob; Step S2: The coarse adjustment knob rotates the fixed gear ring. Step S3: The fixed gear ring drives the planetary gears and the output gear ring to mesh synchronously around the center of the planetary gear train, thereby achieving a rough adjustment of the angular displacement. Step S4: Make fine adjustments to the angular displacement by turning the fine-tuning knob. Step S5: Fine-tune the knob to rotate the planetary gear train; In step S6, the planetary gears rotate along the fixed gear ring and the output gear ring. Due to the tooth difference between the fixed gear ring and the output gear ring, the output gear ring rotates at a small angle during the planetary gear meshing transmission, thereby achieving fine adjustment of the angular displacement.

[0015] The technical solution of this invention has the following advantages: In the technical solution provided by this invention, a fixed gear ring is installed on the coarse adjustment knob, and the planetary gear system is connected to the fine adjustment knob. Both the fixed gear ring and the output gear ring mesh with the planetary gears on the planetary gear system, realizing two modes: rapid coarse positioning and fine adjustment positioning. This allows for rapid and accurate adjustment to the specified position. The device has a compact structure and occupies little space. Furthermore, there is a tooth difference between the fixed gear ring and the output gear ring. The meshing misalignment caused by the difference in the number of teeth achieves the transmission ratio difference, thereby achieving the purpose of precise adjustment of deceleration. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the overall structure of the present invention; Figure 4 This is a structural cross-sectional view of the external shaft system of the present invention; Figure 5 This is a structural cross-sectional view of the internal shaft system of the present invention; Figure 6 This is a cross-sectional view of the planetary gear train of the present invention; Figure 7 This is a schematic diagram of the meshing state of the planetary gears of the present invention.

[0018] 1-Fine adjustment knob; 2-Planetary gear train; 201-Mandrel; 202-Front end cover; 203-First bearing; 204-First friction pad; 205-Planetary gear; 206-Rear end cover; 207-Second bearing; 3-Fixing sleeve; 4-Fixing gear ring; 401-First pin; 5-Coarse adjustment knob; 6-Outer shaft system; 601-Fixing outer sleeve; 602-Second friction pad; 603-Third bearing; 604-Bearing retainer ring; 605-Third friction pad; 606-First shaft retainer ring; 7-Inner shaft system; 701-Output shaft; 702-Second shaft retainer ring; 703-Fourth bearing; 704-Adjusting pad; 705-Fifth bearing; 706-Hole retainer ring; 8-Bushing; 9-First screw; 10-Connecting key; 11-Second screw. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figures 1-7The rotary device shown includes a fine adjustment knob 1 and a coarse adjustment knob 5, which are coaxially arranged to conform to ergonomic usage. A fixed gear ring 4 is mounted on the coarse adjustment knob 5. The rotary device also includes a planetary gear train 2 and an output shaft 701. The planetary gear train 2 is connected to the fine adjustment knob 1. An output gear ring is provided on the output shaft 701 near the end of the fine adjustment knob 1. Both the fixed gear ring 4 and the output gear ring mesh with planetary gears 205 on the planetary gear train 2, and there is a tooth difference between the fixed gear ring 4 and the output gear ring. The output gear ring and the fixed gear ring 4 are coaxially arranged. According to the formula for calculating the pitch circle diameter of a gear, d=mz, where d is the pitch circle diameter, m is the gear module, and z is the number of teeth of the gear, the pitch circle diameter can be calculated. The diameter is equal to the gear module multiplied by the number of teeth. However, due to the tooth difference between the fixed gear ring 4 and the output gear ring, that is, the pitch circle diameters of the fixed gear ring 4 and the output gear ring are not equal, it is theoretically impossible for the fixed gear ring 4 and the output gear ring to mesh with the planet gear 205 at the same time. However, by modifying the planet gear 205, the fixed gear ring 4 and the output gear ring, the large pitch circle of the output gear ring teeth is positively modified by 1 / 2 pitch circle radius difference, the planet gear 205 is positively modified by the same amount, and the small pitch circle of the fixed gear ring 4 is negatively modified by the same amount. Due to the intervention and application of the modification, the originally contradictory center distance is adjusted, so that the fixed gear ring 4 and the output gear ring, which could not mesh with the planet gear 205 at the same time, can mesh through the modification.

[0024] The aforementioned knob device combining coarse and fine adjustment achieves both rapid coarse positioning and fine adjustment positioning by installing a fixed gear ring 4 on the coarse adjustment knob 5, connecting the planetary gear train 2 to the fine adjustment knob 1, and meshing the fixed gear ring 4 and the output gear ring with the planetary gears 205 on the planetary gear train 2. This allows for quick and accurate adjustment to the specified position. The device has a compact structure, occupies little space, and has a tooth difference between the fixed gear ring 4 and the output gear ring. The meshing misalignment caused by the tooth difference achieves the transmission ratio difference, thereby achieving the purpose of precise speed reduction adjustment.

[0025] like Figures 1-7As shown, in this embodiment, the planetary gear train 2 further includes a spindle 201, a front cover 202, and a rear cover 206. Both the front cover 202 and the rear cover 206 are mounted on the spindle 201, and the planetary gears 205 are mounted between the front cover 202 and the rear cover 206. The front cover 202 and the rear cover 206 are rigidly connected by pins, thus forming a planet carrier with the spindle 201. The planetary gears 205 can rotate relative to the spindle 201. The front cover 202 and the rear cover 206, along with the planetary gears... A first friction pad 204 is installed between 205. The fixed gear ring 4 and the coarse adjustment knob 5 are connected by two first pins 401 for coaxial positioning, so that the fixed gear ring 4 and the coarse adjustment knob 5 can rotate synchronously. The fixed gear ring 4 will only rotate when the coarse adjustment knob 5 is rotated. The output gear ring and the output shaft 701 are integrally machined parts. By rotating the coarse adjustment knob 5, the output shaft 701 can be driven to make rapid angular displacement adjustment. Both the fine adjustment knob 1 and the coarse adjustment knob 5 are provided with textured grooves for easy operation.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, the knob device further includes a connecting key 10 and a second screw 11. The fine-tuning knob 1 is connected to the spindle 201 via the second screw 11. The connecting key 10 is disposed on the spindle 201 and the fine-tuning knob 1. The second screw 11 is used to fix the fine-tuning knob 1 and the spindle 201 together. Moreover, by opening keyways on the fine-tuning knob 1 and the spindle 201 respectively, and then installing the connecting key 10 accordingly, it is ensured that the rotation of the fine-tuning knob 1 drives the spindle 201 to drive synchronously, thereby realizing fine angular displacement adjustment.

[0027] like Figures 1-7 As shown, in this embodiment, the knob device also includes a fixing sleeve 3, which is installed on the spindle 201. The fixing sleeve 3 is located between the rear end cover 206 and the fine adjustment knob 1. The fixing sleeve 3 is connected to the fixing gear ring 4 and the coarse adjustment knob 5. The fixing sleeve 3 effectively limits the axial movement of the rear end cover 206 and the fixing gear ring 4. Moreover, the fixing sleeve 3, the fixing gear ring 4, and the coarse adjustment knob 5 are coaxially positioned and installed by four evenly distributed first screws 9, thereby coaxially fixing the planetary gear train 2 in the inner cavity of the coarse adjustment knob 5, ensuring the coaxial cooperation between the coarse adjustment knob 5, the output shaft 701, the planetary gear train 2, and the spindle 201.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, in this embodiment, the knob device further includes an inner shaft system 7, which includes a fourth bearing 703 and a fifth bearing 705. The inner rings of the fourth bearing 703 and the fifth bearing 705 are both fitted with the output shaft 701, and the outer rings of the fourth bearing 703 and the fifth bearing 705 are both fitted with the coarse adjustment knob 5. A second shaft retainer 702 is also installed on the output shaft 701. The second shaft retainer 702 is used to axially limit other components on the output shaft 701. The inner shaft system 7 also includes an adjusting pad 704 and a hole retainer 706. The adjusting pad 704 is installed between the fourth bearing 703 and the fifth bearing 705, and the hole retainer 706 is installed between the fifth bearing 705 and the coarse adjustment knob 5 to limit the fifth bearing 705 and prevent axial movement. One end of the output shaft 701 can be used to connect the knob device with the moving parts of the external actuator when the knob device is connected to an external actuator, including but not limited to gears, pulleys, couplings, etc.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, in this embodiment, the knob device further includes an outer shaft system 6, which includes a fixed outer sleeve 601 and a third bearing 603. The inner ring of the third bearing 603 is fitted with the coarse adjustment knob 5, and the outer ring of the third bearing 603 is fitted with the fixed outer sleeve 601. The outer shaft system 6 also includes a second friction pad 602, a bearing retaining ring 604, a third friction pad 605, and a first shaft retaining ring 606. The second friction pad 602 is installed between the fixed outer sleeve 601 and the coarse adjustment knob 5 to buffer the friction between the fixed outer sleeve 601 and the coarse adjustment knob 5. The bearing retaining ring 604, the third friction pad 605, and the first shaft retaining ring 606 are located at the output end of the output shaft 701. The first shaft retaining ring 606 is installed on the output shaft 701. The third friction pad 605 and the bearing retaining ring 604 are sequentially arranged between the first shaft retaining ring 606 and the third bearing 603. The fixing sleeve 601 is used to connect the knob device to the fixing frame and other units of the external actuator when the knob device is connected to an external actuator to achieve installation and fixation. The friction pad is made of a special material for adjusting the feel and damping, and also for buffering the friction between components.

[0030] like Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7As shown, in this embodiment, the planetary gear train 2 further includes a first bearing 203 and a second bearing 207. The inner ring of the first bearing 203 is mounted on one end of the spindle 201, and the inner ring of the second bearing 207 is mounted on the other end of the spindle 201. The outer ring of the first bearing 203 is fitted with the output shaft 701, and the outer ring of the second bearing 207 is fitted with the fixed pressure sleeve 3. The knob device also includes a bushing 8, which is fixedly mounted on the output shaft 701 and contacts the first bearing 203. The first bearing 203 and the second bearing 207 are used to support the rotation of the spindle 201.

[0031] like Figures 1-7 As shown, the present invention also includes a method for coarse and fine adjustment, which is based on a knob device for coarse and fine adjustment as described in any of the above claims, and includes the following steps: Step S1: Make a rough adjustment of the angular displacement by turning the coarse adjustment knob 5. Step S2: The coarse adjustment knob 5 drives the fixed gear ring 4 to rotate; In step S3, the fixed gear ring 4 drives the planetary gear 205 and the output gear ring to mesh synchronously around the center of the planetary gear train 2, thereby achieving a rough adjustment of the angular displacement. Step S4: Make fine adjustments to the angular displacement by rotating the fine-tuning knob 1; Step S5: Fine-tuning knob 1 drives planetary gear train 2 to rotate; In step S6, the planetary gear 205 rotates along the fixed gear ring 4 and the output gear ring. Due to the tooth difference between the fixed gear ring 4 and the output gear ring, the output gear ring rotates at a small angle during the meshing transmission of the planetary gear 205, thereby achieving fine adjustment of the angular displacement. Specifically, taking planetary gear 205 as an example, the module is 0.5 and the number of teeth is 20. The module of fixed gear ring 4 and output gear ring is also 0.5, the number of teeth of fixed gear ring 4 is 60, and the number of teeth of output gear ring is 61. Coarse and fine adjustments are performed. The purpose of coarse adjustment is to achieve rapid adjustment of angular displacement, quickly and roughly adjusting to the vicinity of the target position. The ratio of output speed to coarse adjustment input speed is 1:1, that is, when the coarse adjustment knob 5 is turned one revolution, the output shaft 701 rotates one revolution synchronously. When the coarse adjustment knob 5 is turned, the fixed gear ring 4 rotates synchronously, thereby creating a tendency to drive the planetary gear 205 to rotate. Since the output gear ring and the planetary gear 205 remain meshed, the force is transmitted from the fixed gear ring 4 to the planetary gear 205, and then to the output gear ring, achieving relative stillness between the fixed gear ring 4, the planetary gear 205, and the output gear ring. Together with the planetary carrier and the fine adjustment knob 1, they rotate synchronously around the center of the planetary carrier. The transmission ratio is 1:1, that is, the amount of rotation actually adjusts the angular displacement, achieving the purpose of rapid adjustment. Fine adjustment is performed to achieve minute, slow adjustments to angular displacement, enabling secondary precise positioning after coarse adjustment. This allows for accurate machining, inspection, and observation. One full rotation of the fine adjustment knob 1 causes the output shaft 701 to rotate one single-tooth pitch angle of the output gear ring, approximately 360 degrees / 61 ≈ 5.9 degrees. Since the fixed gear ring 4 and the coarse adjustment knob 5 are rigidly connected by the first screw 9, fine adjustment of the fine adjustment knob 1 does not require rotation of the coarse adjustment knob 5. Furthermore, the coarse adjustment knob 5 is not subjected to external torque, therefore, the coarse adjustment knob 5 is also affected by... During fine adjustment, the fixed gear ring 4 remains relatively stationary. The fine-tuning knob 1, planet carrier, planet gears 205, and output gear ring participate in rotational adjustment. Because the output gear ring and output shaft 701 are integrated, the rotation of the output gear ring is equivalent to the rotation of the output shaft 701. Since planet gear 205 has 20 teeth, the fixed gear ring 4 has 60 teeth, and the output gear ring has 61 teeth, rotating the fine-tuning knob 1 rotates the planet carrier. Planet gears 205 then revolve synchronously around the center of the planet carrier. Due to displacement, planet gears 205... Planetary gear 205 simultaneously meshes with both the fixed gear ring 4 and the output gear ring, so it also rotates on its own axis. When the fine-tuning knob 1 is turned a full revolution, planetary gear 205 also meshes with the fixed gear ring 4 a full revolution, meaning planetary gear 205 rotates three revolutions. Theoretically, planetary gear 205 also meshes with the output gear ring a full revolution. If the output gear ring also has 60 teeth, then the output gear ring will remain relatively stationary with the fixed gear ring 4, with tooth peaks facing tooth peaks and tooth valleys facing tooth valleys. During this process, only planetary gear 205 is revolving and rotating on its own axis. However, since the output gear ring has 61 teeth... Therefore, each pair of adjacent tooth peaks and valleys between the output gear ring and the fixed gear ring 4 are staggered by an angle. As calculated above, the single tooth pitch angle of the output shaft 701 rotating one output gear ring is 5.9 degrees, that is, the angle difference for one rotation is 5.9 degrees. So, under the action of the fixed gear ring 4, when the fine adjustment knob 1 is turned, the planetary gear 205 rotates one tooth with the fixed gear ring 4, and the planetary gear 205 drives the output gear ring meshed with it to rotate by an angle of 5.9 / 60≈0.098 degrees, thereby realizing the fine adjustment of the micro angular displacement.

[0032] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A knob device combining coarse and fine adjustment, comprising: The fine adjustment knob (1) and the coarse adjustment knob (5) are characterized in that the fine adjustment knob (1) and the coarse adjustment knob (5) are coaxially arranged, and a fixed gear ring (4) is installed on the coarse adjustment knob (5). The knob device also includes a planetary gear train (2) and an output shaft (701). The planetary gear train (2) is connected to the fine adjustment knob (1). An output gear ring is provided on the output shaft (701) at one end near the fine adjustment knob (1). Both the fixed gear ring (4) and the output gear ring mesh with the planetary gears (205) on the planetary gear train (2). There is a tooth difference between the fixed gear ring (4) and the output gear ring.

2. The knob device combining coarse and fine adjustment according to claim 1, characterized in that, The planetary gear train (2) also includes a spindle (201), a front cover (202) and a rear cover (206). The front cover (202) and the rear cover (206) are both mounted on the spindle (201), and the planetary gears (205) are mounted between the front cover (202) and the rear cover (206).

3. The knob device combining coarse and fine adjustment according to claim 2, characterized in that, The knob device also includes a connecting key (10) and a second screw (11). The fine adjustment knob (1) is connected to the spindle (201) via the second screw (11). The connecting key (10) is located on the spindle (201) and the fine adjustment knob (1).

4. The knob device combining coarse and fine adjustment according to claim 2, characterized in that, The knob device also includes a fixing sleeve (3), which is installed on the spindle (201). The fixing sleeve (3) is located between the rear end cover (206) and the fine adjustment knob (1). The fixing sleeve (3) is connected to the fixing gear ring (4) and the coarse adjustment knob (5).

5. The knob device combining coarse and fine adjustment according to claim 1, characterized in that, The knob device also includes an inner shaft system (7), which includes a fourth bearing (703) and a fifth bearing (705). The inner rings of the fourth bearing (703) and the fifth bearing (705) are both installed in conjunction with the output shaft (701), and the outer rings of the fourth bearing (703) and the fifth bearing (705) are both installed in conjunction with the coarse adjustment knob (5).

6. The knob device combining coarse and fine adjustment according to claim 1, characterized in that, The knob device also includes an outer shaft system (6), which includes a fixed outer sleeve (601) and a third bearing (603). The inner ring of the third bearing (603) is fitted with the coarse adjustment knob (5), and the outer ring of the third bearing (603) is fitted with the fixed outer sleeve (601).

7. The knob device combining coarse and fine adjustment according to claim 1, characterized in that, The output gear ring and the fixed gear ring (4) are coaxially arranged.

8. The knob device combining coarse and fine adjustment according to claim 4, characterized in that, The planetary gear train (2) also includes a first bearing (203) and a second bearing (207). The inner ring of the first bearing (203) is installed on one end of the spindle (201), and the inner ring of the second bearing (207) is installed on the other end of the spindle (201). The outer ring of the first bearing (203) is fitted with the output shaft (701), and the outer ring of the second bearing (207) is fitted with the fixed pressure sleeve (3).

9. A knob device combining coarse and fine adjustment according to claim 8, characterized in that, The knob device also includes a bushing (8) mounted on the output shaft (701) and in contact with the first bearing (203).

10. A method for coarse and fine adjustment, the method being implemented based on a rotary knob device for coarse and fine adjustment as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step S1: Make a rough adjustment of the angular displacement by turning the coarse adjustment knob (5). Step S2: The coarse adjustment knob (5) drives the fixed gear ring (4) to rotate; Step S3: The fixed gear ring (4) drives the planetary gear (205) and the output gear ring to mesh synchronously around the center of the planetary gear train (2) to achieve a rough adjustment of the angular displacement. Step S4: Make fine adjustments to the angular displacement by turning the fine adjustment knob (1). Step S5: Fine-tuning knob (1) drives planetary gear train (2) to rotate; In step S6, the planetary gear (205) rotates along the fixed gear ring (4) and the output gear ring. Due to the tooth difference between the fixed gear ring (4) and the output gear ring, the output gear ring rotates at a small angle during the meshing transmission of the planetary gear (205), thereby achieving fine adjustment of the angular displacement.

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