Target auto-switching device

Abstract

This invention provides an automatic target switching device, comprising: a housing assembly, a target wheel assembly for switching targets, a servo motor assembly for controlling the rotation of the target wheel assembly, a transmission assembly for supporting the target wheel assembly, and a control assembly. This invention uses multiple target wheel units installed side-by-side, reducing the size of the switching device, and the number of target wheels can be selected according to actual needs. The selection of the target wheel and the precise switching and adjustment of the target can be achieved by driving two servo motors to rotate through the control unit, eliminating the need for manual replacement or adjustment and reducing the introduction of subjective errors. This invention has a simple structure and provides connection interfaces for use with different collimators or light sources, offering strong expandability. This invention has high overall switching efficiency, a high degree of automation, and strong applicability, meeting the needs of optical parameter detection in telescope systems and performance testing of various other optoelectronic devices.

Description

Technical Field

[0001] This invention relates to the field of optical system parameter detection, and in particular to an automatic target switching device. Background Technology

[0002] With the rapid development of optoelectronic technology, the optical parameter detection system of telescope system is also gradually developing towards high precision, high automation, high integration, strong versatility and integration. However, one of the bottlenecks limiting its automation development is whether the target switching device can meet the requirements of parameter calibration.

[0003] For telescope systems, there are typically more than a dozen parameters that need to be measured, such as on-axis and off-axis MTF, field of view, resolution, magnification, zero-point movement, pupil distance, parallax, field curvature, and chromatic aberration. Therefore, a large number of detection targets are required. Currently, there are two main target switching solutions: one is to display the test target on an LCD screen according to the measured parameters. Although this allows for automatic switching between multiple test targets, the measurement accuracy is difficult to guarantee due to the resolution limitations of the LCD screen. The other is to switch the detection target using a target switching wheel. However, most existing target switching wheels are single-target disc structures, which, when all test targets are embedded, result in a large volume, directly reducing the switching accuracy of the target switching wheel and affecting the measurement results. Furthermore, this method is only suitable for use in large spaces such as laboratories, hindering the automation, integration, and versatility of comprehensive measurement equipment. To improve the measurement accuracy, automation, integration, and versatility of measurement equipment, an automatic target switching device that can be used to perform high-precision parameter calibration with the measurement equipment is needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and to propose an automatic target switching device.

[0005] To achieve the above objectives, the present invention adopts the following specific technical solution:

[0006] The automatic target switching device proposed in this invention includes: a target wheel assembly, a servo motor assembly, and a transmission assembly; wherein,

[0007] The target wheel assembly includes at least two target wheel units, each of which includes: a target wheel for carrying the target, a target for optical testing, and a bearing for carrying the target wheel;

[0008] The edge of the target wheel is a gear structure; the target wheel is mounted on a bearing; target mounting holes for mounting targets are evenly distributed around the target wheel along the axial direction.

[0009] The servo motor assembly for controlling the rotation of the target wheel assembly includes: a first servo motor for driving any one of the target wheel disks to rotate, and a main gear for transmitting force; the main gear is fixedly mounted on the output shaft of the first servo motor and meshes with the gear structure of the target wheel disk.

[0010] The transmission assembly for carrying the target wheel assembly includes: a gear, a second servo motor for driving the gear to rotate, and a transmission rod meshing with the gear for carrying the target wheel assembly;

[0011] The gear is fixedly mounted on the output shaft of the second servo motor. The central axis of the gear and the axis of the output shaft of the second servo motor are collinear and perpendicular to the central axis of the transmission rod.

[0012] The second servo motor drives the transmission rod to reciprocate linearly along the central axis of the transmission rod via gears, so that different target discs mesh with the main gear respectively;

[0013] The transmission rod includes an optical shaft section and a rack section; at least two target wheel units are spaced apart on the optical shaft section; the rack section meshes with a gear; the length of the rack section corresponds to the reciprocating linear motion range of the transmission rod.

[0014] The central axis of the target wheel, the axis of the output shaft of the first servo motor, the central axis of the main gear, and the central axis of the transmission rod are parallel.

[0015] Preferably, the automatic target switching device further includes a housing assembly; the housing assembly includes: a housing, a front baffle mounted on the housing, a rear baffle mounted on the housing opposite to the front baffle, and a flange;

[0016] Both the front and rear baffles are provided with light-transmitting holes for the target to pass through; the positions of the light-transmitting holes correspond to the positions of the target mounting holes; the size of the light-transmitting holes is not smaller than the size of the target mounting holes; flanges are respectively installed at the light-transmitting holes of the front and rear baffles.

[0017] Preferably, the automatic target switching device further includes a control component for controlling the servo motor assembly and the transmission assembly;

[0018] The control components include: a first controller for controlling the first servo motor, a second controller for controlling the second servo motor, and a limit switch for positioning the target wheel;

[0019] The first controller and the second controller are respectively installed on the first servo motor and the second servo motor; the installation position of the limit switch corresponds to the starting position of the target wheel assembly.

[0020] Preferably, the target wheel unit further includes: a pin for preventing the target wheel from rotating freely in a non-drive state, a spring for providing preload to the pin, a pressure ring for fixing the target in the target mounting hole, and a set screw for fixing the spring and the pin; the central axis of the pin is perpendicular to the central axis of the target wheel.

[0021] Preferably, the servo motor assembly further includes: a rolling bearing assembly and a bearing housing for supporting the output shaft of the first servo motor;

[0022] The first servo motor is mounted on the housing and the rear baffle; the bearing housing is fixedly mounted on the housing.

[0023] Preferably, the transmission assembly further includes: a mounting bracket for fixing the second servo motor to the rear baffle, a first sliding bearing mounted on the front baffle for supporting the transmission rod, and a second sliding bearing mounted on the rear baffle for supporting the transmission rod;

[0024] The transmission rod is provided with grooves for engaging with the ejector pin; the number of grooves is the same as the number of target wheel units;

[0025] The central axis of the transmission rod, the central axis of the first sliding bearing, and the central axis of the second sliding bearing are collinear.

[0026] Preferably, the limit switch is mounted on the housing.

[0027] Preferably, both the first servo motor and the second servo motor are equipped with encoders and speed reduction devices.

[0028] Preferably, the optical axis section on the transmission rod used to support the target wheel assembly is provided with a pin, and the target wheel assembly is axially fixed by a retaining pin.

[0029] Preferably, in the target wheel assembly, the planes containing the root circles of the gear structures of at least two target wheel disks are parallel to each other.

[0030] The present invention can achieve the following technical effects:

[0031] This invention employs multiple target wheel units installed side-by-side, reducing the size of the switching device, and the number of target wheels can be selected according to actual needs. The selection of target wheels and precise switching and adjustment of targets can be achieved by driving two servo motors to rotate via the control unit, eliminating the need for manual replacement or adjustment and reducing the introduction of subjective errors. This invention has a simple structure and provides connection interfaces for use with different collimators or light sources, offering strong expandability. Overall, this invention boasts high switching efficiency, a high degree of automation, and strong applicability, meeting the needs of optical parameter detection in telescope systems and performance testing for various other optoelectronic devices. Attached Figure Description

[0032] Figure 1This is a front internal structure diagram of the automatic target switching device according to an embodiment of the present invention;

[0033] Figure 2 This is a front view diagram of the automatic target switching device according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram illustrating the cooperation between the target wheel assembly and the servo motor assembly according to an embodiment of the present invention;

[0035] Figure 4 This is a full sectional view of the target automatic switching device according to an embodiment of the present invention:

[0036] Figure 5 This is a schematic diagram of the structure of a transmission assembly according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram illustrating the fit between the target wheel, the ejector pin, and the groove of the transmission rod according to an embodiment of the present invention.

[0038] The reference numerals in the accompanying drawings include: outer casing assembly 1, front baffle 11, housing 12, rear baffle 13, flange 14, target wheel assembly 2, target wheel disc 21, target 22, bearing 23, pressure ring 24, set screw 25, spring 26, ejector pin 27, target mounting hole 28, servo motor assembly 3, first servo motor 31, main gear 32, rolling bearing assembly 33, bearing seat 34, transmission assembly 4, second servo motor 41, fixing frame 42, gear 43, transmission rod 44, first sliding bearing 45, second sliding bearing 46, groove 47, control assembly 5, limit switch 51. Detailed Implementation

[0039] In the following description, embodiments of the invention will be described with reference to the accompanying drawings. In the description below, the same modules are denoted by the same reference numerals. Where the same reference numerals are used, their names and functions are also the same. Therefore, their detailed description will not be repeated.

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not constitute a limitation thereof.

[0041] The following is combined with Figures 1 to 6 The specific working method of the present invention will be described in detail below:

[0042] like Figure 1 As shown, the present invention proposes an automatic target switching device, comprising: a housing assembly 1, a target wheel assembly 2, a servo motor assembly 3, a transmission assembly 4, and a control assembly 5;

[0043] The housing assembly 1 is used to support and protect other components. The housing assembly 1 includes: a front baffle 11, a housing 12, a rear baffle 13, and a flange 14.

[0044] The front baffle 11 is mounted on the housing 12.

[0045] The rear baffle 13 is mounted on the housing 12 and is positioned opposite to the front baffle 11.

[0046] Both the front baffle 11 and the rear baffle 13 are provided with light-transmitting holes for the target 22 to pass through; the position of the light-transmitting hole corresponds to the position of the target mounting hole 28; the size of the light-transmitting hole is not smaller than the size of the target mounting hole 28;

[0047] Flange 14 is installed at the light-transmitting holes of the front baffle 11 and the rear baffle 13, respectively.

[0048] The target wheel assembly 2 is used to carry and switch the target 22. The target wheel assembly 2 includes at least two target wheel units, each of which includes: a target wheel 21, a target 22, a bearing 23, a pressure ring 24, a set screw 25 for fixing a spring 26 and a pin 27, a spring 26, and a pin 27.

[0049] The number of target wheel units can be adjusted according to actual testing requirements. Multiple target wheel units are installed at intervals on the transmission rod 44. The root circles of the gear structures of the multiple target wheel units 21 are all parallel to each other.

[0050] The target wheel 21 is used to support the target 22. For example... Figure 3 As shown, the edge of the target wheel disk 21 has a gear structure; the target wheel disk 21 is mounted on the transmission rod 44 through the bearing 23; the target wheel disk 21 has target mounting holes 28 for mounting the target 22 and through holes for mounting the ejector pin 27 evenly distributed around the axial direction.

[0051] To ensure the switching accuracy of the automatic target switching device, the target mounting hole 28 has a fixed angular relationship with the gear teeth in the gear structure. In order to achieve the coordinated use of multiple target discs 21, the number of target mounting holes 28 is greater than the number of targets 22. The extra target mounting holes 28 are not used to install targets 22, but serve as light-transmitting holes to allow light to pass through the targets 22 on other target discs 21.

[0052] In one embodiment of the present invention, each target wheel 21 has a target mounting hole 28 which is not used to install a target 22, serving as a light-passing hole.

[0053] Target 22 is used for optical testing. The selection of target 22 should be based on the actual optical testing requirements.

[0054] Bearing 23 is used to support the target disc 21. Bearing 23 is selected as a bearing with constant radial clearance. In one embodiment of the present invention, bearing 23 is selected as a rolling bearing.

[0055] The pressure ring 24 is used to fix the target 22 onto the target mounting hole 28. In one embodiment of the present invention, the pressure ring 24 fixes the target 22 by means of an interference fit with the target mounting hole 28.

[0056] Set screw 25 is used to secure spring 26 and ejector pin 27. Set screw 25 is mounted on target plate 21.

[0057] Spring 26 is used to provide preload force to ejector pin 27 to ensure that ejector pin 27 fits tightly with groove 47 and to prevent target wheel 21 from rotating freely without drive.

[0058] The ejector pin 27 is used to prevent the target wheel 21 from rotating freely without a drive. For example... Figure 6 As shown, the central axis of the ejector pin 27 is perpendicular to the axis of the target wheel 11. The set screw 25, spring 26, and ejector pin 27 are sequentially installed inside the target wheel 21.

[0059] The servo motor assembly 3 is used to control the rotation of the target wheel assembly 2. The servo motor assembly 3 includes: a first servo motor 31, a main gear 32, a rolling bearing assembly 33, and a bearing housing 34.

[0060] The first servo motor 31 is used to drive the rotation of any one of the target discs 21. The first servo motor 31 is mounted on the housing 12 and the rear baffle 13. In order to achieve high-precision rotation of the target discs 21 and high-precision switching of the targets 22, the first servo motor 31 is equipped with an encoder and a reduction gear.

[0061] The main gear 32 is used to transmit the force of the first servo motor 31 to drive the target wheel 21 to rotate. The main gear 32 is fixedly mounted on the output shaft of the first servo motor 31 and meshes with the gear structure of the target wheel 21. The tooth width of the main gear 32 must ensure that when the main gear 32 is meshing with one target wheel 21, it does not contact other target wheels 21 to avoid motion interference.

[0062] In one embodiment of the present invention, the main gear 32 transmits force by keying to the output shaft of the first servo motor 31.

[0063] The rolling bearing assembly 33 and the bearing housing 34 jointly support the output shaft of the first servo motor 31. The rolling bearing assembly 33 is fixedly mounted on the bearing housing 34. The rolling bearing assembly 33 uses a bearing with constant radial clearance. The bearing housing 34 is fixedly mounted on the housing 12.

[0064] In one embodiment of the present invention, the bearing seat 34 is fixedly mounted on the housing 12 by screws.

[0065] The transmission assembly 4 is used to support the target wheel assembly 2. For example... Figure 5As shown, the transmission assembly 4 includes: a second servo motor 41, a fixed frame 42, a gear 43, a transmission rod 44, a first sliding bearing 45, and a second sliding bearing 46.

[0066] The second servo motor 41 drives the transmission rod 44 to reciprocate linearly along the central axis of the transmission rod 44 via the gear 43. To ensure precise switching and positioning between the main gear 32 and the target wheel 21, the second servo motor 41 is equipped with an encoder and a reduction gear.

[0067] The mounting bracket 42 is used to fix the second servo motor 41 to the rear baffle 13. For example... Figure 5 As shown, in one embodiment of the present invention, the mounting bracket fixes the second servo motor 41 to the rear baffle 13 by screws.

[0068] Gear 43 drives the transmission rod 44. Gear 43 is fixedly mounted on the output shaft of the second servo motor 41; the central axis of gear 43 is collinear with the axis of the output shaft of the second servo motor 41 and perpendicular to the central axis of transmission rod 44. In one embodiment of the present invention, gear 43 drives transmission rod 44 by key connection to the output shaft of the second servo motor 41.

[0069] The transmission rod 44 is used to support the target wheel assembly 2. The transmission rod 44 meshes with the gear 43. Figure 6 As shown, the transmission rod 44 is provided with grooves 47 for cooperating with the ejector pin 27; the number of grooves 47 is the same as the number of target wheel units.

[0070] The transmission rod 44 includes a shaft section and a rack section; the shaft section carries the target wheel assembly 2; at least two target wheel disk units are spaced apart and mounted on the shaft section; the shaft section also has a pin hole, which axially positions the target wheel assembly 2 via a retaining pin. The rack section meshes with the gear 43; the length of the rack section corresponds to the reciprocating linear motion range of the transmission rod 44. The rack section does not affect the reciprocating linear motion of the transmission rod 44.

[0071] The central axis of the transmission rod 44, the central axis of the first sliding bearing 45, and the central axis of the second sliding bearing 46 are collinear.

[0072] The first sliding bearing 45 supports the transmission rod 44. The first sliding bearing 45 is mounted on the front baffle 11. Figure 4 As shown, in one embodiment of the present invention, the first sliding bearing 45 is fixedly mounted on the front baffle 11 by screws.

[0073] The second sliding bearing 46 is used to support the transmission rod 44. The second sliding bearing 46 is mounted on the rear baffle 13. Figure 4 As shown, in one embodiment of the present invention, the second sliding bearing 46 is fixedly mounted on the rear baffle 13 by screws.

[0074] The central axis of the target wheel 11, the axis of the output shaft of the first servo motor 31, the central axis of the main gear 32, and the central axis of the transmission rod 44 are parallel.

[0075] The control component 5 is used to control the servo motor component 3 and the transmission component 4. The control component 5 includes: a first controller, a second controller, and a limit switch 51.

[0076] The first controller is used to control the first servo motor 31. The first controller is installed on the first servo motor 31.

[0077] The second controller is used to control the second servo motor 41. The second controller is installed on the second servo motor 41.

[0078] Limit switch 51 is used to position the target wheel 21. The installation position of limit switch 51 corresponds to the starting position of the target wheel assembly 2's movement. Figure 4 As shown, the limit switch 51 is mounted on the housing 12. In one embodiment of the present invention, the limit switch 51 is fixedly mounted on the housing 12 by screws.

[0079] The working principle of the automatic target switching device proposed in this invention is as follows:

[0080] When the control component 5, servo motor component 3, and second servo motor 41 are powered on, the second controller in the control unit 5 first controls the second servo motor 41 to rotate, and drives the target wheel component 2 to move linearly towards the rear baffle 13 through the gear 43 and transmission rod 44. When the last target wheel disk 21 in the target wheel component 2 triggers the limit switch 51, the rotation of the second servo motor 41 stops. At this time, the position of the target wheel component 2 is the initial position of the movement.

[0081] When the target 22 needs to be switched according to the actual optical measurement requirements, the position of the target wheel 21 where the required target 22 is located is first determined. Then, the first controller controls the first servo motor 31 to remain stationary, and the second controller controls the second servo motor 41 to rotate. Through the gear 43 and the transmission rod 44, the target wheel assembly 2 is driven to move linearly in the axial direction of the transmission rod 44 until the target wheel 21 where the required target 22 is located is correctly meshed with the main gear 32. At this time, the second servo motor 41 stops rotating, and the switching of the target wheel 21 is completed. Finally, the second controller controls the second servo motor 41 to remain stationary, and the first controller controls the first servo motor 31 to start moving. The rotation begins, and the main gear 32 and target wheel 21 rotate the required target 22 to the light-transmitting hole of the front baffle 11, stopping the rotation of the first servo motor 31. The axis of the light-transmitting hole of the front baffle 11 is compared with the axis of the light-transmitting holes of other target disks 21 located before the target disk 21 where the required target 22 is located. The target disks 21 whose axes do not coincide are rotated. When the axis of the light-transmitting hole of other target disks 21 (i.e., the target mounting hole 28 where the target 22 is not installed) is coincident with the axis of the light-transmitting hole of the front baffle 11, and the required target 22 is located at the light-transmitting hole of the front baffle 11, the target 22 is switched according to the actual optical measurement requirements.

[0082] It is worth noting that, in the initial state, the axes of the light-transmitting holes on all the target discs 21 are usually aligned with the axis of the light-transmitting holes on the front baffle 11. Therefore, when switching to the desired target 22, the position of the target disc 21 where the desired target 22 is located is determined, and then the target disc 21 is rotated by the first servo motor 31 to rotate the desired target 22 to the light-transmitting hole of the front baffle 11. After each use of the desired target 22, the target disc 21 is reset to the point where the axis of the light-transmitting hole on the target disc 21 is aligned with the axis of the light-transmitting hole on the front baffle 11, so as to facilitate the next use.

[0083] In short, when it is necessary to switch the target disk 21 required for actual measurement, the second servo motor 41 can be rotated by the second controller; when it is necessary to switch the position of the target 22 on the same target disk 21, the first servo motor 31 can be rotated by the first controller; when rotating the required target 22 to the position of the light-transmitting hole, it is also necessary to rotate the other target disks 21 located in front of the target disk 21 where the required target 22 is located, to ensure that the axis of the light-transmitting hole of the other target disks 21 (i.e. the target mounting hole 28 where the target 22 is not installed) is coincident with the axis of the light-transmitting hole of the front baffle 11 (i.e., the other target disks 21 located in front of the target disk 21 where the required target 22 is located do not block the required target).

[0084] In summary, this invention proposes an automatic target switching device. This invention employs multiple target wheel units installed side-by-side, reducing the size of the switching device, and the number of target wheels 21 can be selected according to actual needs. The selection of target wheels 21 and precise switching and adjustment of targets 22 can be achieved by driving two servo motors to rotate via the control unit 5, eliminating the need for manual replacement or adjustment and reducing the introduction of subjective errors. This invention has a simple structure and provides connection interfaces for use with different collimators or light sources, offering strong expandability. Overall, this invention boasts high switching efficiency, a high degree of automation, and strong applicability, meeting the needs of optical parameter detection in telescope systems and performance testing for various other optoelectronic devices.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0087] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An automatic target switching device, characterized in that, include: Target wheel assembly (2), servo motor assembly (3), transmission assembly (4); among which, The target wheel assembly (2) includes at least two target wheel units, each of which includes: a target wheel (21) for carrying the target (22), the target (22) for optical testing, and a bearing (23) for carrying the target wheel (21). The edge of the target wheel disk (21) is a gear structure; the target wheel disk (21) is mounted on the bearing (23); the target wheel disk (21) has target mounting holes (28) evenly distributed around the axial direction for mounting the target (22). The servo motor assembly (3) for controlling the rotation of the target wheel assembly (2) includes: a first servo motor (31) for driving any one of the target wheel disks (21) to rotate, and a main gear (32) for transmitting force; the main gear (32) is fixedly mounted on the output shaft of the first servo motor (31) and meshes with the gear structure of the target wheel disk (21); The transmission assembly (4) for carrying the target wheel assembly (2) includes: a gear (43), a second servo motor (41) for driving the gear (43) to rotate, and a transmission rod (44) meshing with the gear (43) for carrying the target wheel assembly (2). The gear (43) is fixedly mounted on the output shaft of the second servo motor (41). The central axis of the gear (43) is collinear with the axis of the output shaft of the second servo motor (41) and is perpendicular to the central axis of the transmission rod (44). The second servo motor (41) drives the transmission rod (44) to reciprocate linearly along the central axis of the transmission rod (44) through the gear (43), so that different target wheel disks (21) mesh with the main gear (32) respectively; The transmission rod (44) includes an optical axis section and a rack section; at least two target wheel units are spaced apart on the optical axis section; the rack section meshes with the gear (43); the length of the rack section corresponds to the reciprocating linear motion range of the transmission rod (44); The central axis of the target wheel (21), the axis of the output shaft of the first servo motor (31), the central axis of the main gear (32), and the central axis of the transmission rod (44) are parallel.

2. The automatic target switching device as described in claim 1, characterized in that, The target automatic switching device further includes a housing assembly (1); the housing assembly (1) includes: a housing (12), a front baffle (11) mounted on the housing (12), a rear baffle (13) mounted on the housing (12) opposite to the front baffle (11), and a flange (14). Both the front baffle (11) and the rear baffle (13) are provided with light-transmitting holes for the target (22); the position of the light-transmitting hole corresponds to the position of the target mounting hole (28); the size of the light-transmitting hole is not less than the size of the target mounting hole (28); the flange (14) is installed at the light-transmitting holes of the front baffle (11) and the rear baffle (13) respectively.

3. The automatic target switching device as described in claim 2, characterized in that, The target automatic switching device also includes a control component (5) for controlling the servo motor assembly (3) and the transmission assembly (4). The control component (5) includes: a first controller for controlling the first servo motor (31), a second controller for controlling the second servo motor (41), and a limit switch (51) for positioning the target wheel (21). The first controller and the second controller are respectively installed on the first servo motor (31) and the second servo motor (41); the installation position of the limit switch (51) corresponds to the starting position of the movement of the target wheel assembly (2).

4. The automatic target switching device as described in claim 2, characterized in that, The target wheel unit further includes: a pin (27) for preventing the target wheel (21) from rotating freely in a non-drive state, a spring (26) for providing preload to the pin (27), a pressure ring (24) for fixing the target (22) on the target mounting hole (28), and a set screw (25) for fixing the spring (26) and the pin (27); the central axis of the pin (27) is perpendicular to the central axis of the target wheel (21).

5. The automatic target switching device as described in claim 2, characterized in that, The servo motor assembly (3) further includes: a rolling bearing assembly (33) and a bearing housing (34) for supporting the output shaft of the first servo motor (31). The first servo motor (31) is mounted on the housing (12) and the rear baffle (13); the bearing seat (34) is fixedly mounted on the housing (12).

6. The automatic target switching device as described in claim 4, characterized in that, The transmission assembly (4) further includes: a mounting bracket (42) for fixing the second servo motor (41) on the rear baffle (13), a first sliding bearing (45) mounted on the front baffle (11) for supporting the transmission rod (44), and a second sliding bearing (46) mounted on the rear baffle (13) for supporting the transmission rod (44). The transmission rod (44) is provided with grooves (47) for cooperating with the ejector pin (27); the number of grooves (47) is the same as the number of target wheel units; The central axis of the transmission rod (44), the central axis of the first sliding bearing (45), and the central axis of the second sliding bearing (46) are collinear.

7. The automatic target switching device as described in claim 3, characterized in that, The limit switch (51) is mounted on the housing (12).

8. The automatic target switching device as described in claim 1, characterized in that, Both the first servo motor (31) and the second servo motor (41) are equipped with encoders and speed reduction devices.

9. The automatic target switching device as described in claim 1, characterized in that, The optical axis section of the transmission rod (44) for supporting the target wheel assembly (2) is provided with a pin, and the target wheel assembly (2) is axially fixed by a locking pin.

10. The automatic target switching device as described in claim 1, characterized in that, In the target wheel assembly (2), the planes containing the root circles of the gear structures of at least two target wheel disks (21) are parallel to each other.

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