Axial multi-channel optical filter switching device and switching method

Abstract

The invention discloses an axial multi-channel optical filter switching device and a switching method, and the switching device comprises a switching housing which is internally provided with a loading space and is provided with a light passing port for a light path to pass through; the light filtering modules are loaded in the loading space, are sequentially arranged at intervals in the first direction of the switching machine shell and are assembled on the switching machine shell in a sliding mode in the second direction perpendicular to the first direction; a working position corresponding to the light passing opening and a standby position deviating from the light passing opening are formed in the loading space in the second direction; and the switching driving mechanism is supported on the switching machine shell and is used for driving each filtering module to move between the working position and the standby position in a reciprocating manner. According to the invention, the optical path distance of the light beam from the transmitting end to the receiving end is fully utilized, the size of the device can be effectively reduced, and the device is especially suitable for a scene with a large optical filter size or a large number of optical filters.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to an axial multi-channel filter switching device and switching method. Background Technology

[0002] In various optical instruments, filter switching devices are typically required to adapt to the filtering needs of different wavelength bands. Existing filter switching mechanisms are rotary disc types, where filters are mounted in a circular array on a rotating disc. A motor drives the disc to rotate by a specific angle, aligning different filters with the lens. However, this method requires a significantly increased diameter of the rotating disc when dealing with a large number of filters or large filter gears. This results in a larger space occupied by the entire filter switching mechanism, significantly impacting the overall size of the equipment and making it difficult to meet the requirements for miniaturization. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention aims to provide an axial multi-channel filter switching device and switching method, which has the advantage of effectively reducing the size of the device.

[0004] The objective of this invention is achieved through the following technical solution: According to a first aspect of the present disclosure, an axial multi-channel filter switching device is provided, comprising: A switching housing is provided, which has a loading space inside and a light-passing port for the optical path to pass through. A plurality of filter modules, carried in the loading space and arranged sequentially at intervals along a first direction of the switching housing, are slidably mounted on the switching housing along a second direction perpendicular to the first direction. The loading space contains a working position corresponding to the light-transmitting port and a standby position offset from the light-transmitting port in the second direction. The switching drive mechanism, which is mounted on the switching housing, is used to drive each of the filter modules to reciprocate between the working position and the standby position.

[0005] To achieve the above technical solution, during use, the corresponding filter module is moved to the working position by a switching drive mechanism according to the filtering requirements, while other filter modules are in the standby position. At this time, when the light beam passes through the light port, it will pass through the filter module, thereby achieving filtering processing. When filter switching is required, the filter module that needs to be switched to the working position is determined according to the filtering requirements, and then the filter module is driven by the switching drive mechanism to slide the corresponding filter module to the working position along the second direction. At this time, other filter modules are switched to the standby position, thus completing the switching action. Since several filter modules are arranged linearly in the first direction, and switching is achieved by controlling the filter modules to slide along the second direction, it replaces the large-diameter rotary disk loading filter in the prior art, making full use of the optical path distance between the beam from the transmitting end to the receiving end, which can effectively reduce the size of the device, especially suitable for scenarios with large filter size or a large number of filters.

[0006] In some exemplary embodiments, the switching housing includes a detachably connected switching base and a cover, the light-transmitting port is disposed on the cover, and the switching drive mechanism is supported on the switching base.

[0007] To achieve the above technical solution, a closed space is formed by assembling the encapsulation cover and the switching base to avoid interference from external light. The separability of the encapsulation cover and the switching base makes the installation process of the filter and the switching drive mechanism more convenient.

[0008] In some exemplary embodiments, the filter module includes: A fixed base is used for sliding connection with the switching housing; A filter is fixed to the mounting base and used for filtering.

[0009] The above technical solution is implemented to enable the installation of filters and the sliding switching of filter modules.

[0010] In some exemplary embodiments, a guide rod group is provided inside the switching housing corresponding to each of the filter modules, and the fixing seat is slidably sleeved on the guide rod group.

[0011] The above technical solution facilitates the sliding connection of the fixed base.

[0012] In some exemplary embodiments, the switching drive mechanism is selected individually or in combination from the following structures: cam mechanism, crankshaft mechanism, cylinder bank, or electric cylinder bank.

[0013] In some exemplary embodiments, the switching drive mechanism employs a cam mechanism, the cam mechanism comprising: A drive shaft is rotatably mounted on the switching base, and a drive motor for driving the drive shaft to rotate is provided on the switching base; A plurality of drive cams are fixed to the drive shaft and are arranged in a one-to-one correspondence with each of the filter modules. The drive cams abut against the fixed base to drive the filter modules to slide back and forth. Each of the drive cams is offset at a predetermined angle so that when one set of drive cams drives the corresponding filter module to the working position, the other filter modules are in the standby position.

[0014] To achieve the above technical solution, when switching filters, the drive motor controls the drive shaft to rotate at a predetermined angle. As the drive cam follows the rotation of the drive shaft, it can push the corresponding filter module to the working position. Since the angles of different drive cams are deviated from the settings, other filter modules can be placed in the standby position.

[0015] In some exemplary embodiments, a separator ring is fitted on the drive shaft between adjacent drive cams, and a pressure sleeve for pressing and fixing each drive cam is also fitted on the drive shaft.

[0016] To achieve the above technical solution, the separator ring ensures that the fixed spacing of each drive cam corresponds exactly to each filter module, and finally, the pressure sleeve is used to press and fix it, making the installation process more convenient.

[0017] In some exemplary embodiments, the switching base is further provided with a plurality of movable through slots corresponding one-to-one with each of the drive cams.

[0018] By implementing the above technical solution, the movable through slot can allow each cam to rotate through, thereby making the size of the switching housing smaller.

[0019] In some exemplary embodiments, the guide rod assembly is further fitted with an elastic clamping member, which abuts against the fixed seat and remains in a compressed state to apply a clamping force to the fixed seat.

[0020] The above technical solution is achieved by using an elastic clamping component to continuously apply a clamping force to the fixed seat, thereby enabling the fixed seat to abut against the drive cam and facilitating the reset of the fixed seat, thus improving the stability and efficiency of filter switching.

[0021] According to a second aspect of the present disclosure, a filter switching method is provided, the switching method being implemented based on the axial multi-channel filter switching device as described in the first aspect, comprising: Establish the correspondence between the filter module and the action position of the switching drive mechanism; Determine the target filter module to be located at the working position based on the filter requirements; The current position information of the switching drive mechanism is obtained, and the action strategy of the switching drive mechanism is determined according to the correspondence to drive the target filter module to switch to the working position and switch other filter modules to the standby position.

[0022] The above technical solution enables rapid and precise switching of filters.

[0023] In summary, compared with the prior art, the present invention has the following beneficial effects: This invention provides an axial multi-channel filter switching device and method. The switching device includes: a switching housing with a loading space and a light-passing port for optical paths; a plurality of filter modules mounted in the loading space and arranged at intervals along a first direction of the switching housing, each filter module being slidably mounted on the switching housing along a second direction perpendicular to the first direction, and the loading space having a working position corresponding to the light-passing port and a standby position offset from the light-passing port in the second direction; and a switching drive mechanism mounted on the switching housing for driving each filter module to reciprocate between the working position and the standby position. In use, the corresponding filter module is moved to the working position by the switching drive mechanism according to the filtering requirements, while other filter modules are in the standby position. At this time, when the light beam passes through the light port, it will pass through the filter module to achieve filtering. When filter switching is required, the filter module that needs to be switched to the working position is determined according to the filtering requirements, and then the filter module is driven by the switching drive mechanism to slide the corresponding filter module to the working position along the second direction. At this time, other filter modules are switched to the standby position, and the switching action is completed. Since several filter modules are arranged linearly in the first direction and the switching is achieved by controlling the filter modules to slide along the second direction, it replaces the large-diameter rotary disk loading filter in the prior art, makes full use of the optical path distance between the beam from the transmitter to the receiver, and can effectively reduce the size of the device. It is especially suitable for scenarios with large filter size or a large number of filters. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the axial multi-channel filter switching device in an embodiment of the present invention.

[0025] Figure 2 This is an exploded view of the axial multi-channel filter switching device in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the switching base in an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the structure of the encapsulation cover in an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the assembly structure of the switching base and the switching drive mechanism in an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the structure of the fixing base in an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the connection structure between the drive shaft and the drive cam in an embodiment of the present invention.

[0031] The numbers and letters in the diagram represent the names of the corresponding components: 10. Switching housing; 11. Switching base; 12. Encapsulation cover; 13. Light passage port; 14. Guide rod assembly; 15. Elastic clamping component; 16. Movable through slot; 20. Filter module; 21. Fixing base; 211. Fixing ring; 212. Fixing protrusion; 213. Sliding sleeve hole; 22. Filter; 30. Switching drive mechanism; 31. Drive shaft; 32. Drive motor; 33. Drive cam; 34. Separator ring; 35. Pressure sleeve; 36. Bearing; 37. Bearing cover. Detailed Implementation

[0032] 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 obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1 to 7 As shown, a first aspect of the present invention provides an axial multi-channel filter 22 switching device, comprising: a switching housing 10, wherein a loading space is formed within the switching housing 10, and a light-passing port 13 for allowing an optical path to pass through is provided on the switching housing 10; a plurality of filter modules 20 carried in the loading space and arranged sequentially at intervals along a first direction of the switching housing 10, each filter module 20 being slidably mounted on the switching housing 10 along a second direction perpendicular to the first direction, and a working position corresponding to the light-passing port 13 and a standby position offset from the light-passing port 13 being formed in the loading space in the second direction; and a switching drive mechanism 30 carried in the switching housing 10 for driving each filter module 20 to reciprocate between the working position and the standby position.

[0034] Specifically, the switching housing 10 includes a detachably connected switching base 11 and a cover 12. A light-transmitting port 13 is disposed on the cover 12. The switching drive mechanism 30 is supported on the switching base 11. A loading space is formed between the switching base 11 and the cover 12. The cover 12 and the switching base 11 are interlocked and fixed by bolts. The light-transmitting port 13 can be used to install lens modules such as collimating lenses and focusing lenses. The cover 12 and the switching base 11 are assembled to form a closed space to avoid interference from external light. The separability of the cover 12 and the switching base 11 makes the installation process of the filter 22 and the switching drive mechanism 30 more convenient.

[0035] The filter module 20 includes: a fixed base 21 for sliding connection with the switching housing 10; and a filter 22 fixed to the fixed base 21 for filtering. The fixed base 21 includes a fixed retaining ring 211 and fixed protrusions 212 on both sides of the fixed retaining ring 211. The fixed retaining ring 211 is adapted to the filter 22. The filter 22 is installed on the fixed retaining ring 211 by snapping or bonding. A guide rod group 14 is provided in the switching housing 10 for each filter module 20. The fixed base 21 is slidably sleeved on the guide rod group 14. The fixed protrusions 212 are provided with sliding sleeve holes 213 adapted to the guide rod group 14. The fixed base 21 is slidably sleeved on the guide rod group 14 through the sliding sleeve holes 213 to facilitate the sliding connection of the fixed base 21. By driving the fixed base 21 to reciprocate, the sliding switching of the filter module 20 can be realized.

[0036] In one specific example, the first direction is along the length of the switching housing 10, and the second direction is along the height of the switching housing 10. Thus, the filter modules 20 are arranged linearly in the horizontal direction, and each filter module 20 corresponds to a different wavelength. The fixing base 21 is slidably mounted on the switching housing 10 in the vertical direction. Usually, the switching base 11 and the encapsulation cover 12 are provided with oppositely arranged insertion holes. The guide rod group 14 is inserted and fixed in the insertion hole and is in a vertical state. In other embodiments, the first direction and the second direction can also be other suitable directions.

[0037] The switching drive mechanism 30 can be selected individually or in combination from the following structures: cam mechanism, crankshaft mechanism, cylinder group or electric cylinder group. Preferably, in this embodiment, the switching drive mechanism 30 adopts a cam mechanism, which includes: a drive shaft 31 rotatably mounted on the switching base 11, and a drive motor 32 for driving the drive shaft 31 to rotate on the switching base 11; a plurality of drive cams 33 fixed to the drive shaft 31 and corresponding to each filter module 20, the drive cams 33 abutting against the fixed seat 21 to drive the filter module 20 to slide back and forth, and each drive cam 33 is offset at a predetermined angle so that when one set of drive cams 33 drives the corresponding filter module 20 to move to the working position, the other filter modules 20 are in the standby position.

[0038] Specifically, the switching base 11 is provided with mounting holes for the drive shaft 31 to pass through. Both ends of the drive shaft 31 can be rotatably connected to the mounting holes via bearings 36. A bearing cover is press-fitted into one side of the mounting hole, while the other side is used for the motor shaft to pass through. The drive motor 32 is locked to the side of the switching base 11 by screws. A bayonet adapted to the motor shaft is provided at the end of the drive shaft 31. After the motor shaft passes through the mounting hole, it is inserted and fixed into the bayonet, thereby controlling the rotation of the drive shaft 31.

[0039] A partition ring 34 is fitted on the drive shaft 31 between adjacent drive cams 33, and a pressure sleeve 35 for pressing and fixing each drive cam 33 is also fitted on the drive shaft 31. It can be understood that the thickness of the partition ring 34 is consistent with the spacing of the filter module 20, so that when the drive cam 33 is in close contact with the partition ring 34, it corresponds to each filter module 20. In some embodiments, corresponding first and second slots can also be provided between the drive cam 33 and the partition ring 34. By inserting pins into the first and second slots, the drive cam 33 and the partition ring 34 can be relatively fixed. The second slots on both sides of the partition ring 34 are offset from each other, and the offset angle is consistent with the deviation angle between the drive cams 33. A fastening screw is locked on the pressure sleeve 35. When the fastening screw is tightened and pressed against the drive shaft 31, the pressure sleeve 35 can be fixed on the drive shaft 31. The separator ring 34 ensures that the fixed spacing of each drive cam 33 corresponds exactly to each filter module 20, and finally is pressed and fixed by the pressure sleeve 35, making the installation process more convenient; when the filter module 20 moves to the working position, the other filter modules 20 are in the standby position, which can be controlled by setting the size of the drive cam 33.

[0040] The filter modules 20 can be arranged in order of their corresponding wavelengths and have specific position identifiers for precise switching control. These position identifiers can be unique identification codes and stored in the main control system of the device. Each position identifier corresponds to the rotation angle value of a drive motor 32. Thus, when the main control system controls the drive motor 32 to rotate to a predetermined angle, it can control the filter module 20 at the corresponding position to be in the working position.

[0041] Typically, a sensor module can also be installed on the encapsulation cover 12. This sensor module is used to detect the rotation angle of the drive motor 32 and / or the height of the mounting base 21. For example, the sensor module includes a Hall sensor and / or a photoelectric sensor. The Hall sensor is installed at the mounting hole of the switching base 11 to detect the rotation angle of the drive motor 32 and can perform zero-position calibration, thereby realizing precise rotation angle control of the drive motor 32. The photoelectric sensor is located on the encapsulation cover 12 and several groups are set for each filter module 20. Each group of photoelectric sensors corresponds to a filter module 20 and is located at the highest position close to the mounting base 21. The photoelectric sensor is corresponding to the light emitter and light receiver set on both sides of the encapsulation cover 12. When the mounting base 21 of the corresponding filter module 20 moves to the highest position, the photoelectric detection signal of the corresponding photoelectric sensor can be blocked, thereby determining that the filter module 20 is in the working position and realizing precise switching of the filter 22.

[0042] When switching filters 22, the drive shaft 31 is rotated by the drive motor 32 at a predetermined angle. The drive cam 33 follows the rotation of the drive shaft 31 and pushes the corresponding filter module 20 to the working position. Since the angles of different drive cams 33 are deviated from the settings, other filter modules 20 can be placed in the standby position. Usually, when the filter module 20 rises to the highest position, the filter module 20 is in the working position.

[0043] Furthermore, an elastic clamping member 15 is also fitted onto the guide rod assembly 14. The elastic clamping member 15 abuts against the fixed seat 21 and is always kept in a compressed state to apply clamping force to the fixed seat 21. It can be understood that the elastic clamping member 15 is usually a spring, and the two ends of the elastic clamping member 15 abut against the fixed seat 21 and the encapsulation cover 12 respectively. By applying clamping force to the fixed seat 21 through the elastic clamping member 15, the fixed seat 21 can be pressed against the drive cam 33, which can facilitate the reset of the fixed seat 21 and improve the stability and switching efficiency of the filter 22 switching. In addition, a number of movable through slots 16 corresponding to each drive cam 33 can be opened on the switching base 11. The movable through slots 16 can allow each cam to rotate through, thereby making the size of the switching housing 10 smaller.

[0044] In other embodiments, the switching drive mechanism 30 may also be a crankshaft mechanism, a cylinder group, or an electric cylinder group.

[0045] When a crankshaft mechanism is selected, the crankshaft mechanism may include a crankshaft rotatably mounted on the switching base 11 and a drive motor 32 connected to the crankshaft. Several cranks are provided on the crankshaft, and each crank is offset from each other by a predetermined angle and corresponds to a filter module 20. When the drive motor 32 controls the crankshaft to rotate, it drives each filter module 20 to move up and down. Of course, in some embodiments, a transmission link may also be provided between the crank and the bottom of the fixed base 21. One end of the transmission link is rotatably connected to the crank and the other end is hinged to the bottom of the fixed base 21, thereby realizing the power transmission between the two.

[0046] When a cylinder group is selected, the cylinder group includes several drive cylinders that correspond one-to-one with each filter module 20. The drive cylinder is fixed at the bottom of the switching base 11 and its piston rod is fixed to the fixed base 21. At this time, controlling the corresponding drive cylinder to move can drive the required filter module 20 to the working position. When the filter module 20 moves to the working position, the other filter modules 20 are in the standby position, which can be achieved by controlling the extension length of the piston rod of the drive cylinder.

[0047] Similarly, when an electric cylinder assembly is selected, the electric cylinder assembly includes several drive electric cylinders that correspond one-to-one with each filter module 20. The drive electric cylinders are fixed at the bottom of the switching base 11, and the required filter module 20 can be driven to the working position by controlling the corresponding electric cylinder to move.

[0048] In use, according to the filtering requirements, the corresponding filter module 20 is driven to the working position by the switching drive mechanism 30, while other filter modules 20 are in the standby position. At this time, when the light beam passes through the light port 13, it will pass through the filter module 20, thereby achieving filtering processing. When the filter 22 needs to be switched, the filter module 20 that needs to be switched to the working position is determined according to the filtering requirements, and then the filter module 20 is driven by the switching drive mechanism 30 to slide along the second direction to the working position. At this time, other filter modules 20 are switched to the standby position, and the switching action can be completed. Since several filter modules 20 are arranged linearly in the first direction, and the switching is achieved by controlling the filter module 20 to slide along the second direction, it replaces the large-diameter rotary disk loading filter 22 in the prior art, making full use of the optical path distance between the beam from the transmitting end to the receiving end, which can effectively reduce the size of the device, especially suitable for scenarios where the filter 22 is large in size or the number of filters 22 is large.

[0049] A second aspect of the present invention provides a method for switching a filter 22, which is implemented based on the axial multi-channel filter 22 switching device as described in the first aspect, and includes: S100. Establish the correspondence between the filter module 20 and the operating position of the switching drive mechanism 30. Specifically, each filter module 20 has a unique position identifier. Different actions of the switching drive mechanism 30 can make each filter module 20 occupy different positions. Taking the switching drive mechanism 30 as a cam mechanism as an example, if 10 sets of filter modules 20 are set, each set of drive cams 33 will be offset from each other by 36°. When the drive motor 32 is at zero position, the outermost filter module 20 is at the highest position. At this time, the rotation angle of the drive motor 32 every 36° corresponds to a set of filter modules 20. The corresponding rotation angles of the drive motor 32 are 0°, 36°, 72°, 108°, ..., 324°. Thus, the corresponding filter module 20 can be controlled to be in the working position through this correspondence. Of course, if the switching drive mechanism 30 is a cylinder group, each drive cylinder also corresponds to a unique identifier. When the corresponding drive cylinder extends its piston rod, the corresponding filter module 20 can be controlled to be in the working position.

[0050] S200. Based on the filtering requirements, determine the target filter module 20 to be located at the working position. It can be understood that the filtering requirements are the wavelength bands to be filtered. Once the corresponding target filter module 20 is determined, its specific location can be determined according to its position mark.

[0051] S300: Obtain the current position information of the switching drive mechanism 30; determine the action strategy of the switching drive mechanism 30 according to the corresponding relationship to drive the target filter module 20 to switch to the working position and switch other filter modules 20 to the standby position. The current position information can be obtained from the sensor module, such as the rotation angle of the current drive motor 32. The action strategy is the specific action direction and displacement distance or angle of the switching drive mechanism 30. Taking the switching drive mechanism 30 as a cam mechanism as an example, for example, using 1-10 as the position identifier of the filter module 20, the current filter module 1 is in the working position, and the rotation angle of the drive motor 32 is 0°. When the target filter module 20 is determined to be filter module 2, the action strategy is to rotate forward 36°. After the drive motor 32 rotates forward 36°, it can control filter module 2 to be in the working position, thereby realizing the fast and accurate switching of the filter 22.

[0052] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. An axial multi-channel filter switching device, characterized by, The application relates to a switching device for axial multi-channel optical filters, which comprises a switching housing, a plurality of filter modules, and a switching driving mechanism. The switching housing is internally formed with a loading space, and is externally provided with a light passage opening for the light path. The filter modules are sequentially and spacedly arranged along a first direction of the switching housing, and are slidingly assembled in the switching housing along a second direction perpendicular to the first direction. The loading space is internally formed with a working position corresponding to the light passage opening and a standby position deviated from the light passage opening along the second direction. The switching driving mechanism is arranged on the switching housing and is used for driving the filter modules to reciprocally move between the working position and the standby position.

2. The axial multi-pass filter switching device of claim 1, wherein, The switching housing comprises a detachably connected switching base and a sealing cover, the light passage opening is arranged on the sealing cover, and the switching driving mechanism is arranged on the switching base.

3. The axial multi-pass filter switching device according to claim 1 or 2, characterized in that The filter module comprises a fixed seat and a filter plate. The fixed seat is slidingly connected with the switching housing. The filter plate is fixed on the fixed seat and is used for filtering.

4. The axial multi-channel filter switching device of claim 3, wherein, The switching housing is internally provided with a guide rod group corresponding to each filter module.

5. The axial multi-channel filter switching device of claim 3, wherein, The switching driving mechanism is selected from a cam mechanism, a crank mechanism, a cylinder group or an electric cylinder group.

6. The axial multi-channel filter switching device of claim 5, wherein, The switching driving mechanism adopts the cam mechanism. The cam mechanism comprises a driving shaft rotatingly assembled on the switching base, a driving motor arranged on the switching base and used for driving the driving shaft to rotate, and a plurality of driving cams fixed on the driving shaft and corresponding to each filter module. The driving cams abut against the fixed seat to drive the filter modules to reciprocally slide.

7. The axial multi-channel filter switching device of claim 6, wherein, Each driving cam is deviatedly arranged at a predetermined angle, so that when one group of driving cams drives the corresponding filter modules to move to the working position, the other filter modules are located at the standby position.

8. The axial multi-channel filter switching device of claim 6, wherein, A separation ring is sleeved on the driving shaft between adjacent driving cams.

9. The axial multi-channel filter switching device of claim 4, wherein, The driving shaft is further sleeved with a pressing sleeve used for pressing and fixing each driving cam.

10. A filter switching method characterized by, The switching base is further provided with a plurality of movable grooves corresponding to each driving cam. The guide rod group is further sleeved with an elastic pressing member abutting against the fixed seat and always keeping a compressed state to apply a pressing force to the fixed seat. The switching method is based on the axial multi-channel filter switching device according to any one of claims 1-9, and comprises the following steps. A corresponding relationship between the filter modules and the action positions of the switching driving mechanism is established. A target filter module required to be located at the working position is determined based on the filtering requirement. Current position information of the switching driving mechanism is acquired, an action strategy of the switching driving mechanism is determined according to the corresponding relationship to drive the target filter module to switch to the working position and drive the other filter modules to switch to the standby position.

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