Two-dimensional adjusting mechanism and method applied to focusing and bias current adjustment of space optical camera

Abstract

The invention provides a two-dimensional adjusting mechanism and method applied to focusing and bias current adjustment of a space optical camera, and relates to the technical field of space optical remote sensing. The two-dimensional adjusting mechanism comprises a base, a sliding seat, a back plate, a first driving device, a first worm wheel, a lead screw shaft, a nut, a second driving device, a second worm wheel, a worm wheel shaft, a pinion and an arc-shaped rack; the focusing module achieves focusing in the mode that a lead screw shaft is matched with a nut, the bias current adjusting module achieves bias current adjusting in the mode that a small gear is matched with an arc-shaped rack, and the mechanism has the advantages of being lower in manufacturing cost, higher in adjusting precision and better in shaking precision. The problems that an adjusting mechanism in the prior art is high in manufacturing difficulty, low in adjusting precision, low in shaking precision, large in backlash gap and poor in bearing capacity are solved.

Description

Technical Field

[0001] The present invention relates to the field of space optical remote sensing technology, and in particular to a two-dimensional adjustment mechanism and method for focusing and bias current adjustment of a space optical camera. Background Art

[0002] When a space remote sensing camera shoots a target area, the image shift direction of the photographed target on the image plane forms a deviation angle with the CCD push-scan direction due to the rotation of the earth and other reasons. Therefore, the focusing mechanism needs to compensate for the image shift while compensating for the defocus amount. In order to ensure the imaging quality of the space remote sensing camera in space, in addition to the focusing function, self-locking, vibration resistance and other requirements that can be met by the traditional focusing mechanism, the focusing mechanism is also required to have the function of focusing and adjusting the deviation flow at the same time.

[0003] A Chinese patent with publication number CN105527690A discloses an integrated two-dimensional actuator for adjusting the focal plane of a space optical camera, the mechanism comprising a focusing module and a bias flow adjustment module; the focusing module of the mechanism is driven by a stepper motor, decelerated by a worm gear transmission, and the rotation of the stepper motor is converted into a linear motion of the focal plane through an eccentric shaft, thereby realizing the focusing function; the bias flow adjustment module of the mechanism is driven by a stepper motor, decelerated by a worm gear transmission, and the rotation is converted into a linear motion of a fork through a lead screw and nut, and the focal plane is driven to rotate through a fork seat, thereby realizing the bias flow adjustment function; the focusing module of the mechanism is implemented by an eccentric shaft, which has the disadvantages of high manufacturing difficulty, low adjustment accuracy, and low shaking accuracy; the bias flow adjustment module is implemented by a lead screw and nut in combination with a fork (fork seat), which has the disadvantages of large backlash, poor load-bearing capacity, and poor adjustment accuracy. 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 two-dimensional adjustment mechanism and method for focusing and deflection adjustment of a space optical camera.

[0005] The invention discloses a two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera, comprising: a base, a slide, a back plate, a focusing module and a deflection adjustment module, wherein the focusing module comprises a first driving device, a first worm gear, a lead screw shaft and a nut, wherein the lead screw shaft is rotatably arranged on the base, the first worm gear is fixedly arranged on the lead screw shaft, the nut is installed on the lead screw shaft, the nut is connected to the slide, the power output end of the first driving device is connected to the first worm gear, and the deflection adjustment module comprises a second driving device, a second worm gear, a worm gear shaft, a pinion gear and an arc-shaped rack, wherein the power output end of the second driving device is connected to the second worm gear, the worm gear shaft is rotatably arranged on the back plate, the second worm gear and the pinion gear are both fixedly arranged on the worm gear shaft, the arc-shaped rack gear is connected to one end of the base, the other end of the base is hinged to the back plate, and the arc-shaped rack gear is meshed with the pinion gear.

[0006] Furthermore, the two-dimensional adjustment mechanism also includes guide rails arranged in pairs on the base, and the slide seat is provided with sliders corresponding to the guide rails, and the sliders are slidably connected to the guide rails.

[0007] Furthermore, the two-dimensional adjustment mechanism also includes an arc guide rail, which is arranged on the base, and an arc slider corresponding to the arc guide rail is arranged on the back plate, and the arc slider is slidably arranged on the arc guide rail.

[0008] Furthermore, the first driving device is a first motor module, which includes a driving motor, a motor bracket, a coupling and a driving worm. The motor bracket is connected to the driving motor, the power output shaft of the driving motor is connected to one end of the coupling, the other end of the coupling is connected to one end of the driving worm, the other end of the driving worm is installed on the motor bracket, and the driving worm is meshed with the first worm gear.

[0009] Furthermore, the driving worm includes a worm shaft and a worm sleeve, the worm shaft is mounted on the motor bracket, the worm sleeve is fixedly mounted on the worm shaft, and a top screw is also provided at the connection between the worm sleeve and the worm shaft.

[0010] Furthermore, the driving motor is a stepping motor, and the power output shaft of the stepping motor is connected to the coupling.

[0011] Furthermore, the two-dimensional adjustment mechanism also includes a grating scale and a reading head, and the grating scale and the reading head are arranged on the base.

[0012] Furthermore, the two-dimensional adjustment mechanism also includes a deep groove ball bearing, a first angular contact ball bearing and a first sleeve, and the deep groove ball bearing, the first angular contact ball bearing and the first sleeve are all installed on the screw shaft.

[0013] Furthermore, the two-dimensional adjustment mechanism also includes a second angular contact ball bearing, the inner ring of the second angular contact ball bearing is arranged on the back plate, the outer ring of the second angular contact ball bearing is connected to an adapter, and the adapter is connected to the base.

[0014] The present invention also includes a method for focusing and deflection flow adjustment applied to a space optical camera. The method is implemented based on the two-dimensional adjustment mechanism for focusing and deflection flow adjustment applied to a space optical camera as described in any of the above items. The first driving device drives the first worm gear to rotate, and the first worm gear drives the screw shaft to rotate, and then the nut drives the slide to move along the screw shaft to achieve focusing; the second driving device drives the second worm gear to rotate, and the second worm gear drives the worm gear shaft and the pinion to rotate, and then the arc-shaped rack drives the base to rotate with the hinge between the base and the back plate as the center to achieve deflection flow adjustment.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. In the technical solution provided by the present invention, the focusing module adopts the method of combining a screw shaft and a nut to achieve focusing. Compared with the focusing method of an eccentric shaft, it has the advantages of lower manufacturing cost, higher adjustment accuracy and better shaking accuracy; the deviation flow adjustment module realizes deviation flow adjustment by combining a pinion with an arc-shaped rack. Compared with the deviation flow adjustment method of combining a screw nut with a shift fork, it has the advantages of higher structural rigidity, stronger load capacity, higher adjustment resolution and higher adjustment accuracy; at the same time, by designing the focusing module and the deviation flow adjustment module as a whole, the adjustment mechanism is compact in structure and occupies little space.

[0017] 2. In the technical solution provided by the present invention, the focusing module adopts a pair of guide rails as a moving pair, and the bias current adjustment module adopts an arc guide rail as a moving pair, which has high structural rigidity, good shaking accuracy and good structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a cross-sectional view of the focusing module structure of the present invention;

[0021] Figure 3 This is a cross-sectional view of the structure of the bias flow adjustment module of the present invention;

[0022] Figure 4 This is a cross-sectional view of the structure of the first motor module of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the worm shaft and the worm sleeve of the present invention;

[0024] Figure 6 It is an exploded view of the pinion structure of the present invention.

[0025] Description of reference numerals:

[0026] 1-base; 2-first motor module; 3-first worm gear; 4-screw shaft; 5-nut; 6-guide rail; 7-slide; 8-deep groove ball bearing; 9-first angular contact ball bearing; 10-first sleeve; 11-grating scale and reading head; 12-second motor module; 13-second worm gear; 14-worm gear shaft; 15-pinion; 16-arc rack; 17-arc guide rail; 18-back plate; 19-second angular contact ball bearing; 20-stepping motor; 21-motor bracket; 22-coupling; 23-worm shaft; 24-worm sleeve; 25-top screw. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, 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.

[0031] like Figure 1 to Figure 3The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera shown in the figure comprises: a base 1, a slide 7, a back plate 18, a focusing module and a deflection adjustment module, wherein the focusing module comprises a first driving device, a first worm gear 3, a screw shaft 4 and a nut 5, wherein the screw shaft 4 is rotatably arranged on the base 1, and the screw shaft 4 is installed in a manner of one end being fixed and the other end being movable, and a deep groove ball bearing 8 is arranged at the fixed end, and the deep groove ball bearing 8 is installed on the screw shaft 4, and a first angular contact ball bearing 9 is arranged at the movable end, and the first angular contact ball bearing 9 is arranged in pairs on the screw shaft 4, and the outer rings of the deep groove ball bearing 8 and the first angular contact ball bearing 9 are both installed on the base 1, and the deep groove ball bearing 8 and the first angular contact ball bearing 9 are both axially positioned by an end cover arranged on the base 1, and the first worm gear 3 is fixedly arranged on the screw shaft 4, The first worm gear 3 is fixed on the screw shaft 4 by a flat key for circumferential positioning. The screw shaft 4 is also provided with a first sleeve 10. The first worm gear 3 is axially positioned by the first sleeve 10. The nut 5 is installed on the screw shaft 4. The nut 5 is threadedly connected to the slide 7. The power output end of the first drive device is connected to the first worm gear 3. The bias flow adjustment module includes a second drive device, a second worm gear 13, a worm gear shaft 14, a pinion 15 and an arcuate rack 16. The power output end of the second drive device is connected to the second worm gear 13. The worm gear shaft 14 is rotatably set on the back plate 18. The second worm gear 13 and the pinion 15 are both fixedly set on the worm gear shaft 14. The arcuate rack 16 is connected to one end of the base 1, and the other end of the base 1 is hinged to the back plate 18. The arcuate rack 16 is meshed with the pinion 15, and the focal plane is installed on the slide 7.

[0032] The above-mentioned two-dimensional adjustment mechanism for focusing and deflection flow adjustment of space optical cameras, the focusing module adopts the combination of the screw shaft 4 and the nut 5 to achieve focusing, compared with the eccentric shaft focusing method, it has the advantages of lower manufacturing cost, higher adjustment accuracy and better shaking accuracy; the deflection flow adjustment module realizes deflection flow adjustment by means of a pinion 15 in combination with an arc-shaped rack 16, compared with the deflection flow adjustment method of the screw nut in combination with a shift fork, it has the advantages of higher structural rigidity, stronger load capacity, higher adjustment resolution and higher adjustment accuracy; at the same time, by designing the focusing module and the deflection flow adjustment module as a whole, the adjustment mechanism is compact in structure and occupies little space.

[0033] like Figure 1 As shown, in this embodiment, the two-dimensional adjustment mechanism also includes guide rails 6 arranged in pairs and in parallel on the base 1, and a slider corresponding to the guide rails 6 is arranged on the slide 7, and the slider is slidably connected to the guide rails 6; the focusing module adopts the guide rails 6 arranged in pairs as a moving pair, and the slide 7 moves along the guide rails 6, which helps to increase the stability of the movement of the slide 7, and the adjustment accuracy is higher and the shaking accuracy is better.

[0034] like Figure 3As shown, in this embodiment, the two-dimensional adjustment mechanism also includes an arc guide rail 17, the arc guide rail 17 is arranged on the base 1, and an arc slider corresponding to the arc guide rail 17 is arranged on the back plate 18, and the arc slider is slidably arranged on the arc guide rail 17; the second worm gear 13 drives the worm gear shaft 14 and the pinion 15 to rotate, and then the arc rack 16 drives the base 1 to rotate around the hinge between the base 1 and the back plate 18 to realize the function of adjusting the bias flow, so that the mechanism has high positioning accuracy and high shaking accuracy, and is suitable for large-scale wide and long linear array focal plane components.

[0035] like Figure 1 to Figure 6As shown, in this embodiment, the first driving device is a first motor module 2, and the first motor module 2 includes a driving motor, a motor bracket 21, a coupling 22 and a driving worm. The motor bracket 21 is connected to the driving motor, and the power output shaft of the driving motor is connected to one end of the coupling 22. The other end of the coupling 22 is connected to one end of the driving worm. The other end of the driving worm is mounted on the motor bracket 21, and the driving worm is meshed with the first worm wheel 3; the motor bracket 21 is mounted on the base 1, and the driving motor is a stepper motor 20. The power output shaft of the stepper motor 20 is connected to the coupling 22; the stepper motor 20 drives the coupling 22 and the driving worm to rotate, thereby achieving To further drive the first worm gear 3, the driving worm includes a worm shaft 23 and a worm sleeve 24. The purpose of using a segmented double-lead indexing worm pair is to eliminate the return clearance in the worm gear transmission process. The axial tooth profiles and leads of the worm shaft 23 and the worm sleeve 24 are symmetrically distributed. During installation, the central axis position of the first worm gear 3 is first fixed, and the first worm gear 3 is rotated to ensure that any tooth in the symmetrical central section of the end face of the first worm gear 3 is perpendicular to the axis of the first worm gear 3 and is bisected by the center line on the symmetrical central section, and then the first worm gear 3 is fixed; then the worm sleeve 24 is installed on the worm shaft 23, and the cross section of the worm shaft 23 corresponds to the cross section of the worm sleeve 24, to ensure that the first On the premise that the center distance between the worm wheel 3 and the driving worm is equal, the cross section of the worm shaft 23 is close to the right side of the selected tooth in the first worm wheel 3 and contacts the tooth surface, and the cross section of the worm sleeve 24 is close to the left side of the selected tooth in the first worm wheel 3 and contacts the tooth surface; the worm shaft 23 is installed on the motor bracket 21 through a bearing, the bearing type is an angular contact ball bearing, the worm sleeve 24 is fixedly installed on the worm shaft 23, and a top screw 25 is also provided at the connection between the worm sleeve 24 and the worm shaft 23 for fastening and installation; the second driving device is a second motor module 12, and the second motor module 12 is installed on the back plate 18. The structural composition of the second motor module 12 is the same as that of the first driving device, so it is not repeated here. The driving worm in the second motor module 12 is meshed with the second worm wheel 13, the second worm wheel 13 is mounted on the worm wheel shaft 14 through a flat key and is circumferentially positioned, the second worm wheel 13 is axially positioned through a second sleeve, the pinion 15 is also mounted on the worm wheel shaft 14 through a flat key for circumferential positioning, the pinion 15 is axially positioned through a locking nut, and the worm wheel shaft 14 is mounted on the back plate 18 through a bearing, and the bearing type is an angular contact ball bearing, which has a large load-bearing capacity and high rigidity, and is suitable for use in the adjustment mechanism; the two-dimensional adjustment mechanism also includes a grating ruler and a reading head 11, which are arranged on the base 1; the pinion 15 adopts the following Figure 6 The double gear backlash elimination method shown in the figure eliminates the backlash. Figure 6Install in the manner shown. When the pinion 15 is meshing with the arc-shaped rack 16, first loosen and remove the bolts, then shift gear A and gear B so that the gear teeth of gear A and gear B clamp the teeth of the arc-shaped rack 16 to eliminate the gap, and then tighten the mounting bolts. The use of a worm gear transmission method helps to improve the self-locking property of the mechanism. At the same time, the worm gear transmission also has a deceleration function, which helps to improve the adjustment accuracy of the mechanism.

[0036] like Figure 3 As shown, in this embodiment, the two-dimensional adjustment mechanism also includes a second angular contact ball bearing 19, the second angular contact ball bearings 19 are arranged in pairs, the inner ring of the second angular contact ball bearing 19 is arranged on the back plate 18, the outer ring of the second angular contact ball bearing 19 is connected with an adapter, and the adapter is connected to the base 1; when the arc rack 16 drives the base 1 to rotate along the circular arc guide rail 17, the second angular contact ball bearing 19 provides rotation support to ensure the realization of the deviation flow adjustment function of the mechanism.

[0037] like Figure 1 to Figure 3 As shown, the present invention also includes a method for focusing and deflection flow adjustment applied to a space optical camera, which is implemented based on the two-dimensional adjustment mechanism for focusing and deflection flow adjustment applied to a space optical camera as described in any one of the above items, wherein a first driving device drives a first worm gear 3 to rotate, and the first worm gear 3 drives a lead screw shaft 4 to rotate, and then a nut 5 drives a slide seat 7 to move along the lead screw shaft 4 to achieve focusing; a second driving device drives a second worm gear 13 to rotate, and the second worm gear 13 drives a worm gear shaft 14 and a pinion 15 to rotate, and then an arc-shaped rack 16 drives a base 1 to rotate around a hinge between the base 1 and a back plate 18 to achieve deflection flow adjustment;

[0038] Specifically, the stepper motor 20 drives the coupling 22 to rotate, the coupling 22 drives the worm shaft 23 and the worm sleeve 24 to rotate, and then the first worm gear 3 rotates, the first worm gear 3 drives the lead screw shaft 4 to rotate, and then the nut 5 drives the slide 7 to move along the lead screw shaft 4 to achieve the focusing function; the second motor module 12 also drives the second worm gear 13 to rotate, the second worm gear 13 drives the worm gear shaft 14 and the pinion 15 to rotate, and then the arc rack 16 drives the base 1 to rotate around the hinge between the base 1 and the back plate 18 to achieve the bias flow adjustment function;

[0039] The motor bracket 21 is made of titanium alloy TC4 material, the base 1, slide 7 and back plate 18 are all made of SiCp / Al material, the worm shaft 23, screw shaft 4, nut 5 and worm wheel shaft 14 are all made of bearing steel 40Cr material, the first worm wheel 3, the second worm wheel 13, the pinion 15 and the arc rack 16 are all made of copper alloy material, the stepping motor 20, grating scale and reading head 11, circular arc guide rail 17 and guide rail 6 are standard parts.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A two-dimensional adjustment mechanism for focusing and biasing a space optical camera, including: A base (1), a slide (7), a back plate (18), a focus adjustment module and a bias flow adjustment module, characterized in that the focus adjustment module comprises a first drive device, a first worm gear (3), a screw shaft (4) and a nut (5), the screw shaft (4) is rotatably arranged on the base (1), the first worm gear (3) is fixedly arranged on the screw shaft (4), the nut (5) is installed on the screw shaft (4), the nut (5) is connected to the slide (7), the power output end of the first drive device is connected to the first worm gear (3), and the bias flow adjustment module comprises a second A driving device, a second worm gear (13), a worm gear shaft (14), a pinion gear (15) and an arc-shaped rack (16); a power output end of the second driving device is connected to the second worm gear (13); the worm gear shaft (14) is rotatably arranged on a back plate (18); the second worm gear (13) and the pinion gear (15) are both fixedly arranged on the worm gear shaft (14); the arc-shaped rack (16) is connected to one end of a base (1); the other end of the base (1) is hinged to the back plate (18); and the arc-shaped rack (16) is meshed with the pinion gear (15).

2. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 1, characterized in that: The two-dimensional adjustment mechanism also includes guide rails (6) arranged in pairs on the base (1), and a sliding block corresponding to the guide rails (6) is arranged on the sliding seat (7), and the sliding block is slidably connected to the guide rails (6).

3. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 1, characterized in that: The two-dimensional adjustment mechanism also includes an arc guide rail (17), the arc guide rail (17) is arranged on the base (1), and an arc slider corresponding to the arc guide rail (17) is arranged on the back plate (18), and the arc slider is slidably arranged on the arc guide rail (17).

4. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 1, characterized in that: The first driving device is a first motor module (2), the first motor module (2) comprising a driving motor, a motor bracket (21), a coupling (22) and a driving worm, the motor bracket (21) is connected to the driving motor, the power output shaft of the driving motor is connected to one end of the coupling (22), the other end of the coupling (22) is connected to one end of the driving worm, the other end of the driving worm is mounted on the motor bracket (21), and the driving worm is meshed with the first worm wheel (3).

5. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 4, characterized in that: The driving worm comprises a worm shaft (23) and a worm sleeve (24); the worm shaft (23) is mounted on a motor bracket (21); the worm sleeve (24) is fixedly mounted on the worm shaft (23); and a top screw (25) is further provided at the connection between the worm sleeve (24) and the worm shaft (23).

6. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 4, characterized in that: The driving motor is a stepping motor (20), and the power output shaft of the stepping motor (20) is connected to the coupling (22).

7. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 1, characterized in that: The two-dimensional adjustment mechanism also includes a grating ruler and a reading head (11), and the grating ruler and the reading head (11) are arranged on the base (1).

8. The two-dimensional adjustment mechanism for focusing and biasing a space optical camera according to claim 1, characterized in that: The two-dimensional adjustment mechanism also includes a deep groove ball bearing (8), a first angular contact ball bearing (9) and a first sleeve (10), and the deep groove ball bearing (8), the first angular contact ball bearing (9) and the first sleeve (10) are all mounted on the screw shaft (4).

9. The two-dimensional adjustment mechanism for focusing and deflection adjustment of a space optical camera according to claim 1, characterized in that: The two-dimensional adjustment mechanism also includes a second angular contact ball bearing (19), the inner ring of the second angular contact ball bearing (19) is arranged on the back plate (18), the outer ring of the second angular contact ball bearing (19) is connected to an adapter seat, and the adapter seat is connected to the base (1).

10. A method for adjusting focus and bias flow applied to a space optical camera, the method being implemented based on the two-dimensional adjustment mechanism for adjusting focus and bias flow applied to a space optical camera as claimed in any one of claims 1 to 9, characterized in that: The first driving device drives the first worm gear (3) to rotate, the first worm gear (3) drives the lead screw shaft (4) to rotate, and then the nut (5) drives the slide seat (7) to move along the lead screw shaft (4) to achieve focusing; the second driving device drives the second worm gear (13) to rotate, the second worm gear (13) drives the worm gear shaft (14) and the pinion gear (15) to rotate, and then the arc-shaped rack (16) drives the base (1) to rotate around the hinge between the base (1) and the back plate (18) to achieve bias flow adjustment.

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