Worm and gear electric rotation displacement table

Abstract

The invention discloses a worm and gear electric rotary displacement table, which belongs to the technical field of electric rotary displacement tables and comprises a shell and a gap adjusting mechanism, an output wheel is rotatably connected onto the shell, a driving motor, a worm gear and a worm are arranged in the shell, the worm gear is coaxially and fixedly connected onto the output wheel, and the worm is meshed with the worm gear. One end of the worm is coaxially and fixedly connected with a motor shaft of the driving motor, the gap adjusting mechanism at least comprises a positioning part and a moving part, the end, connected with the driving motor, of the worm is rotationally connected to the positioning part, the positioning part is fixedly arranged in the shell, and the end, away from the driving motor, of the worm is rotationally connected to the moving part; the moving part can rotate in a positioning mode with the position where the positioning part is located as a circle center shaft, the circle center shaft is parallel to the axis of the worm gear, and the meshing gap between the worm and the worm gear can be changed by adjusting the position of the moving part. And the size of the meshing clearance between the worm and the worm gear is adjusted, so that the meshing clearance is maintained at a proper meshing clearance, and precise transmission is ensured.

Description

Technical Field

[0001] This invention relates to the field of electric rotary displacement stage technology, and in particular to a worm gear electric rotary displacement stage. Background Technology

[0002] As a precision motion control device, the electric rotary stage primarily functions to drive the precise rotation and positioning of workpieces or loads. It is widely used in optical system construction, semiconductor processing and testing, biomedical instruments, and various precision manufacturing and measurement fields. Currently, most commercially available electric rotary stages typically include a motor and transmission components in their motion actuators. From the perspective of transmission and accuracy maintenance, most rotary stages use a worm gear as the core transmission pair. However, during long-term continuous operation, the inevitable wear of the meshing surfaces leads to a gradual increase in transmission clearance (backlash). Increased backlash directly causes a decrease in the repeatability of the rotary stage, thus affecting the stability and reliability of the entire system and ultimately harming the user experience. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned technical problems and provide a worm gear electric rotary displacement stage. Through the gap adjustment mechanism, the meshing gap between the worm and the worm wheel can be adjusted during assembly or after wear to maintain it at a suitable meshing gap, thereby ensuring precision transmission.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a worm gear electric rotary displacement stage, including a housing, an output wheel rotatably connected to the housing, a drive motor, a worm gear, and a worm inside the housing, the worm gear being coaxially fixedly connected to the output wheel, the worm meshing with the worm gear, and one end of the worm being coaxially fixedly connected to the motor shaft of the drive motor; it also includes a clearance adjustment mechanism, the clearance adjustment mechanism including at least a positioning part and a moving part, the end of the worm connected to the drive motor being rotatably connected to the positioning part, the positioning part being fixedly disposed inside the housing, and the end of the worm away from the drive motor being rotatably connected to the moving part, the moving part being capable of positioning and rotating about the position of the positioning part as the central axis, the central axis being parallel to the axis of the worm gear, and by adjusting the position of the moving part, the meshing clearance between the worm and the worm gear can be changed.

[0005] In one embodiment, the positioning part includes a positioning bearing, the outer ring of which is fixedly disposed inside the housing via a bearing seat, and the worm gear is fixedly connected to the inner ring of the positioning bearing.

[0006] In one embodiment, the movable part includes a movable bearing and a spring plunger. The movable bearing is suspended inside the housing. The worm gear is fixedly connected to the inner ring of the movable bearing. The outer ring of the movable bearing is provided with a positioning groove. The spring plunger is mounted on the housing, and the end of the pin of the spring plunger abuts against the positioning groove.

[0007] In one embodiment, both the positioning bearing and the movable bearing are deep groove ball bearings.

[0008] In one embodiment, an axial clamping mechanism is further included, the axial clamping mechanism including a support spring and a spring end cap, the spring end cap being fixedly connected to the housing, one end of the support spring being fixedly connected to the spring end cap, and the other end of the support spring being fixedly connected to the end of the worm gear away from the drive motor.

[0009] In one embodiment, a manual knob is also included, which is located outside the housing. The drive motor is a dual-head motor, with one end of the motor shaft of the dual-head motor fixedly connected to the manual knob and the other end fixedly connected to the worm gear.

[0010] In one embodiment, a drive controller is also included, which is installed inside the housing and is used to control the drive motor.

[0011] In one embodiment, the output wheel is rotatably connected to the housing via a rotary bearing.

[0012] In one embodiment, the rotating bearing is a preloaded four-point contact deep groove ball bearing.

[0013] In one embodiment, the housing is provided with a scale ring, which is coaxially sleeved on the outside of the output wheel.

[0014] The present invention achieves the following technical effects compared to the prior art: The worm gear electric rotary displacement table of the present invention includes a clearance adjustment mechanism, which includes a positioning part, a moving part, and an elastic part. One end of the worm gear connected to the drive motor is rotatably connected to the positioning part, and the other end of the worm gear away from the drive motor is rotatably connected to the moving part. The moving part can perform positioning rotation with the position of the positioning part as the center axis (positioning rotation means rotating to the target position and maintaining it at the target position). By adjusting the position of the moving part, the meshing clearance between the worm gear and the worm wheel can be changed to maintain it at a suitable meshing clearance, thus ensuring precision transmission. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained by analyzing these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the back of the worm gear electric rotary displacement table in an embodiment of the present invention; Figure 2 This is a front structural diagram of the worm gear electric rotary displacement table in an embodiment of the present invention; Figure 3 This is a schematic diagram of the left side structure of the worm gear electric rotary displacement table in an embodiment of the present invention; Figure 4 This is a schematic diagram of the right side structure of the worm gear electric rotary displacement table in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the back of the worm gear electric rotary displacement table in an embodiment of the present invention; Figure 6 for Figure 5 A schematic diagram of the structure at point AA of the electric rotary displacement table with worm gear; Figure 7 This is a schematic diagram of the internal three-dimensional structure of the worm gear electric rotary displacement table in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the structural relationship between the worm gear, worm, clearance adjustment mechanism, and axial clamping mechanism in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached diagram: 1. Housing; 2. Output wheel; 3. Drive motor; 4. Worm gear; 5. Worm; 6. Positioning bearing; 7. Bearing housing; 8. Moving bearing; 9. Spring plunger; 10. Spring end cap; 11. Support spring; 12. Manual knob; 13. Drive controller; 14. Rotary bearing; 15. Scale ring; 16. Heat dissipation hole. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide an electric rotary displacement stage for worm gears to solve the problems existing in the prior art. Through the clearance adjustment mechanism, the meshing clearance between the worm and the worm wheel can be adjusted during assembly or after wear to maintain it at a suitable meshing clearance, thereby ensuring precision transmission.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 8 As shown, this embodiment provides a worm gear electric rotary displacement stage, including a housing 1 and a gap adjustment mechanism. An output wheel 2 is rotatably connected to the housing 1, and can be connected to a workpiece or load to drive the workpiece or load to rotate. The output wheel 2 can be a solid shaft or a hollow bushing. A drive motor 3, a worm gear 4, and a worm 5 are housed inside the housing 1. The worm gear 4 is coaxially and fixedly connected to the output wheel 2, and the worm 5 meshes with the worm gear 4. One end of the worm 5 is coaxially and fixedly connected to the motor shaft of the drive motor 3. Through the worm gear transmission mechanism, the horizontal rotation of the drive motor 3 is converted into the vertical rotation of the output wheel 2. The gap adjustment mechanism includes a positioning part, a moving part, and an elastic part. The end of the worm 5 connected to the drive motor 3 is rotatably connected to the positioning part, which is fixedly disposed inside the housing 1. The end of the worm 5 away from the drive motor 3 is rotatably connected to the moving part. The movable part is movably disposed within the housing 1. The movable part can rotate around the position of the positioning part as the central axis (note: positioning rotation means rotating to the target position and maintaining it at the target position), and the central axis is parallel to the axis of the worm wheel 4. By adjusting the position of the movable part, the meshing clearance between the worm 5 and the worm wheel 4 can be changed.

[0022] Working principle: The rotation of the motor shaft of the drive motor 3 drives the worm 5 to rotate, which in turn drives the worm wheel 4 meshing with it to rotate, ultimately driving the output wheel 2 to rotate. This output wheel 2 then drives the workpiece or load to rotate. When the meshing clearance between the worm 5 and the worm wheel 4 increases and needs adjustment (e.g., due to wear), the drive moving part can be positioned and moved, causing the end of the worm 5 furthest from the drive motor 3 to move around the positioning part towards the worm wheel 4. This brings the helical teeth of the worm 5 closer to the worm wheel 4, reducing the meshing clearance between the worm 5 and the worm wheel 4, thus ensuring precision transmission.

[0023] In one embodiment, the positioning part includes a positioning bearing 6, the outer ring of the positioning bearing 6 is fixedly disposed inside the housing 1 through a bearing seat 7, and the worm 5 is fixedly connected to the inner ring of the positioning bearing 6.

[0024] In one embodiment, the movable part includes a movable bearing 8 and a spring plunger 9. The movable bearing 8 is suspended inside the housing 1, and the worm gear 5 is fixedly connected to the inner ring of the movable bearing 8. A positioning groove is provided on the outer ring of the movable bearing 8. The spring plunger 9 is mounted on the housing 1, and the end of the pin of the spring plunger 9 abuts against the positioning groove.

[0025] By turning the spring plunger 9, the end of the pin of the spring plunger 9 moves against the movable bearing 8, adjusting the position of the worm 5 and reducing the meshing clearance between the worm wheel 4 and the worm 5, thus ensuring precision transmission. Furthermore, because the spring plunger 9 has a spring preload, when the clearance between the worm wheel 4 and the worm 5 increases, the movable bearing 8 of the worm 5 is subjected to spring force, which can adaptively adjust the position of the worm 5, reducing the meshing clearance between the worm wheel 4 and the worm 5, achieving high repeatability and long-term stability.

[0026] In one embodiment, both the positioning bearing 6 and the sliding bearing 8 are deep groove ball bearings.

[0027] In one embodiment, an axial clamping mechanism is also included. This mechanism comprises a spring end cap 10 and a support spring 11. The spring end cap 10 is fixedly connected to the housing 1. One end of the support spring 11 is fixedly connected to the spring end cap 10, and the other end of the support spring 11 is fixedly connected to the end of the worm gear 5 furthest from the drive motor 3. The support spring 11 applies an axial preload to the worm gear 5, reducing worm gear movement and improving the accuracy of the worm gear transmission.

[0028] In one embodiment, the support spring 11 is a cylindrical helical spring.

[0029] In one embodiment, a manual knob 12 is also included. The manual knob 12 is located outside the housing 1. The drive motor 3 is a dual-head motor. One end of the motor shaft of the dual-head motor is fixedly connected to the manual knob 12, and the other end is fixedly connected to the worm gear 5.

[0030] In one embodiment, a drive controller 13 is also included. The drive controller 13 is installed inside the housing 1 and is used to control the drive motor 3. Existing electric rotary stages on the market all require external control equipment to drive the stage, while this worm gear electric rotary stage integrates the drive controller 13, eliminating the need for an additional controller, making it more convenient to use and occupying less space. This results in a compact electric rotary stage with an integrated controller and a simple and reliable worm gear clearance adjustment mechanism, applicable to fields such as optics.

[0031] In one embodiment, the output wheel 2 is rotatably connected to the housing 1 via a rotating bearing 14. The outer ring of the rotating bearing 14 is fixedly connected to the inside of the housing 1, and the inner ring of the rotating bearing 14 is coaxially sleeved on the outside of the output wheel 2. The output wheel 2 is fixedly connected to the inner ring of the rotating bearing 14.

[0032] In one embodiment, the rotating bearing 14 is a preloaded four-point contact deep groove ball bearing. Using a preloaded four-point contact deep groove ball bearing can effectively reduce the axial runout of the output wheel 2, ensuring the stability of the optical path when the worm gear electric rotary displacement stage is used in the optical path.

[0033] In one embodiment, the outer casing 1 is provided with a scale ring 15, which is coaxially sleeved on the outside of the output wheel 2, and can quantify the rotation degree of the output wheel 2.

[0034] In one embodiment, the outer casing 1 is further provided with heat dissipation holes 16, the positions of which correspond to the positions of the drive motor 3, so as to quickly dissipate the heat generated by the drive motor 3.

[0035] In one embodiment, the drive motor 3 can be connected to the worm gear 5 via a pin-hole structure.

[0036] In one embodiment, the worm gear 4 and the output wheel 2 can be connected by screws.

[0037] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A worm gear electric rotary displacement stage, comprising a housing, an output wheel rotatably connected to the housing, a drive motor, a worm gear, and a worm shaft disposed within the housing, the worm gear being coaxially and fixedly connected to the output wheel, the worm shaft meshing with the worm gear, and one end of the worm shaft being coaxially and fixedly connected to the motor shaft of the drive motor, characterized in that, It also includes a clearance adjustment mechanism, which includes at least a positioning part and a moving part. One end of the worm gear connected to the drive motor is rotatably connected to the positioning part, which is fixedly disposed inside the housing. The other end of the worm gear away from the drive motor is rotatably connected to the moving part. The moving part can rotate around the position of the positioning part as the central axis, which is parallel to the axis of the worm wheel. By adjusting the position of the moving part, the meshing clearance between the worm gear and the worm wheel can be changed.

2. The worm gear electric rotary displacement table according to claim 1, characterized in that, The positioning part includes a positioning bearing, the outer ring of which is fixedly disposed inside the housing by a bearing seat, and the worm gear is fixedly connected to the inner ring of the positioning bearing.

3. The worm gear electric rotary displacement table according to claim 2, characterized in that, The moving part includes a movable bearing and a spring plunger. The movable bearing is suspended inside the housing. The worm gear is fixedly connected to the inner ring of the movable bearing. The outer ring of the movable bearing is provided with a positioning groove. The spring plunger is mounted on the housing, and the end of the pin of the spring plunger abuts against the positioning groove.

4. The worm gear electric rotary displacement table according to claim 3, characterized in that, Both the positioning bearing and the moving bearing are deep groove ball bearings.

5. The worm gear electric rotary displacement table according to any one of claims 1-4, characterized in that, It also includes an axial clamping mechanism, which includes a support spring and a spring end cap. The spring end cap is fixedly connected to the housing. One end of the support spring is fixedly connected to the spring end cap, and the other end of the support spring is fixedly connected to the end of the worm gear away from the drive motor.

6. The worm gear electric rotary displacement table according to claim 1, characterized in that, It also includes a manual knob located outside the housing. The drive motor is a dual-head motor, with one end of the motor shaft of the dual-head motor fixedly connected to the manual knob and the other end fixedly connected to the worm gear.

7. The worm gear electric rotary displacement table according to claim 1, characterized in that, It also includes a drive controller, which is installed inside the housing and is used to control the drive motor.

8. The worm gear electric rotary displacement table according to claim 1, characterized in that, The output wheel is rotatably connected to the housing via a rotary bearing.

9. The worm gear electric rotary displacement stage according to claim 8, characterized in that, The rotating bearing is a preloaded four-point contact deep groove ball bearing.

10. The worm gear electric rotary displacement stage according to claim 9, characterized in that, The outer casing is provided with a scale ring, which is coaxially sleeved on the outside of the output wheel.

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