Optical fiber head inspection tool

Abstract

The utility model relates to an optical fiber head inspection tool which comprises a base, a microscope assembly and an optical fiber head fixing unit. The microscope assembly is rotationally installed on the base and used for checking the optical fiber head. The optical fiber head fixing unit is rotatably mounted on the base and is opposite to the microscope assembly, the optical fiber head fixing unit is provided with a mounting cavity, and the mounting cavity is used for mounting an optical fiber head. The optical fiber head inspection tool is used for inspecting the cleaning degree of the optical fiber head from multiple angles, so that stains or tiny impurity particles on the optical fiber head can be cleaned conveniently, and the probability of influencing normal operation of an optical fiber laser is reduced.

Description

Technical Field

[0001] The utility model relates to the field of laser equipment auxiliary tools, in particular to an optical fiber head inspection tool. Background Art

[0002] Currently, fiber lasers are being used more and more widely, and optical fiber is one of the most critical components in the entire laser equipment. As the channel and medium for laser transmission, it is very important to ensure the cleanliness of the fiber head end face. If there are stains or tiny foreign particles on the fiber head, it will have a significant impact on the laser transmission quality and may even damage the entire fiber. Therefore, when the fiber laser is first installed or when the fiber is replaced, the fiber head end face needs to be inspected and cleaned, which is currently difficult to inspect directly with the naked eye. In the application scenario of fiber lasers, the fiber head inspection tool is an indispensable tool. Utility Model Content

[0003] The embodiment of the utility model provides an optical fiber head inspection tool for inspecting the cleanliness of an optical fiber head from multiple angles, so as to clean stains or tiny foreign particles on the optical fiber head and reduce the probability of affecting the normal operation of the optical fiber laser.

[0004] In order to achieve the above-mentioned purpose, the embodiments of the present invention adopt the following technical solutions:

[0005] The utility model provides a fiber optic head inspection tool, comprising a base, a microscope assembly, and a fiber optic head fixing unit. The microscope assembly is rotatably mounted on the base and is used to inspect the fiber optic head. The fiber optic head fixing unit is rotatably mounted on the base and disposed opposite the microscope assembly. The fiber optic head fixing unit has an installation cavity for mounting the fiber optic head.

[0006] When using the fiber optic head inspection tool, the fiber optic head needs to be placed in the installation cavity so that the fiber optic head is fixed on the fiber optic head fixing unit, and the fiber optic head faces the microscope assembly, so that the fiber optic head can be observed through the microscope assembly. By rotating the microscope assembly and / or rotating the fiber optic head fixing unit, the microscope assembly can check the cleanliness of the fiber optic head from multiple angles to clean stains or tiny impurity particles on the fiber optic head, reducing the chance of affecting the normal operation of the fiber laser. In addition, the fiber optic head inspection tool has few restrictions on usage scenarios, is easy to carry, does not require additional equipment, takes up little space, and is flexible to deploy.

[0007] In some embodiments, the microscope assembly includes a first mounting base, a second mounting base, and a microscope. The first mounting base is rotatably mounted on the base. The second mounting base is mounted on the first mounting base. The first mounting base and the second mounting base cooperate to clamp at least a portion of the microscope, thereby securing the microscope between the first mounting base and the second mounting base.

[0008] In some embodiments, the microscope assembly further comprises a light source, which is mounted at the objective lens of the microscope to provide light to the optical fiber head.

[0009] In some embodiments, the optical fiber head fixing unit includes a rotating frame, an optical fiber fixing seat, and a pressure plate. One end of the rotating frame is rotatably mounted on the base. The optical fiber fixing seat is mounted on the rotating frame. The pressure plate is mounted on the optical fiber fixing seat, and the mounting cavity is formed between the optical fiber fixing seat and the pressure plate. The optical fiber fixing seat and the pressure plate cooperate to clamp at least a portion of the optical fiber head to secure the optical fiber head within the mounting cavity.

[0010] In some embodiments, the surface of the optical fiber fixing seat that contacts the optical fiber head has an inwardly extending groove.

[0011] In some embodiments, a dimension of the groove in a first direction gradually increases along a second direction, and the first direction and the second direction are perpendicular to each other.

[0012] In some embodiments, the first direction and the second direction are parallel to a reference plane, and the orthographic projection of the groove on the reference plane is V-shaped.

[0013] In some embodiments, the base includes an adapter plate, a support rod, and a bottom plate. The first fixing seat is rotatably mounted on one side of the adapter plate, and one end of the rotating frame is rotatably mounted on the other side of the adapter plate. One end of the support rod is mounted on the adapter plate, and the bottom plate is mounted on the other end of the support rod.

[0014] In some embodiments, the base further includes an adjustment member. The adapter plate is provided with an arc-shaped hole, the center of which is located at the connection position between the adapter plate and the rotating frame. One end of the adjustment member passes through the arc-shaped hole and is connected to the rotating frame, and is freely movable within the arc-shaped hole to adjust the relative position of the rotating frame and the adapter plate.

[0015] In some embodiments, the support rods include a first support rod, a second support rod, and an adjustment handle. One end of the first support rod is connected to the adapter plate. One end of the second support rod is connected to the base plate. The adjustment handle is rotatably mounted at the junction of the other end of the first support rod and the other end of the second support rod, and the adjustment handle is configured to adjust the angle between the first support rod and the second support rod with each circumferential rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an optical fiber head inspection tool according to an embodiment of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of a microscope assembly according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of an assembly structure of a spherical bearing and a base according to an embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of an assembly structure of the first fixing base and the second fixing base according to an embodiment of the present utility model;

[0020] Figure 5 This is a structural diagram of a light source according to an embodiment of the utility model;

[0021] Figure 6 This is a structural schematic diagram of an optical fiber head fixing unit according to an embodiment of the present utility model;

[0022] Figure 7 This is a schematic diagram of an assembly structure of an adjusting screw and an embossed nut according to an embodiment of the utility model;

[0023] Figure 8 This is a schematic diagram of an assembly structure of an optical fiber fixing seat and a pressing plate according to an embodiment of the utility model;

[0024] Figure 9 This is a structural schematic diagram of a groove in an embodiment of the utility model;

[0025] Figure 10 This is a structural diagram of a base according to an embodiment of the present utility model;

[0026] Figure 11 This is a structural schematic diagram of an arc-shaped hole in an embodiment of the present utility model;

[0027] Figure 12 This is a schematic diagram of an assembly structure of an adjusting member and an arc-shaped hole according to an embodiment of the utility model;

[0028] Figure 13 This is a structural diagram of an adjusting member according to an embodiment of the utility model;

[0029] Figure 14 This is a structural schematic diagram of a support rod according to an embodiment of the utility model;

[0030] Figure 15 This is a schematic diagram of an assembly structure of the first support rod and the second support rod in an embodiment of the present utility model. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It is obvious that the embodiments described are only some 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 making creative efforts are within the scope of protection of the present invention. It should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected, indirectly connected through an intermediate medium, or they can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] A fiber laser uses rare-earth-doped glass fiber as its gain medium. Fiber lasers can be developed based on fiber amplifiers. Pump light easily creates high power density within the fiber, causing a "population inversion" in the laser energy level of the working material. When a positive feedback loop (forming a resonant cavity) is properly incorporated, laser oscillation output can be achieved.

[0033] Fiber lasers have a wide range of applications, including laser fiber communications, laser space long-distance communications, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, printing roller making, metal and non-metal drilling / cutting / welding (brass welding, quenching, cladding and deep welding), military defense security, medical equipment and instruments, large-scale infrastructure construction, as a pump source for other lasers, etc.

[0034] The optical fiber in the fiber laser is one of the most critical parts of the entire fiber laser. The stains or tiny impurity particles on the fiber head will seriously affect the normal operation of the fiber laser. It is difficult for the human eye to directly inspect it, so the inspection of the cleanliness of the fiber head end face is particularly important.

[0035] In view of the above situation, if Figure 1As shown, the utility model provides an optical fiber head inspection tool 100. The optical fiber head inspection tool 100 may include a base 20, a microscope assembly 30, and an optical fiber head fixing unit 40. The microscope assembly 30 is rotatably mounted on the base 20 so that the relative position of the microscope assembly 30 relative to the base 20 can be adjusted at multiple angles to facilitate inspection of the optical fiber head 41 and expand the area for inspection of the end face of the optical fiber head 41. In addition, the optical fiber head fixing unit 40 is rotatably mounted on the base 20, thereby also adjusting the relative position of the optical fiber head fixing unit 40 and the base 20, so that the microscope assembly 30 can inspect the optical fiber head 41. The optical fiber head fixing unit 40 is arranged opposite to the microscope assembly 30, and the optical fiber head fixing unit 40 has an installation cavity 50, and the installation cavity 50 is used to install the optical fiber head 41.

[0036] When using the fiber optic head inspection tool 100, the fiber optic head 41 needs to be placed in the installation cavity 50 so that the fiber optic head 41 is fixed on the fiber optic head fixing unit 40, and the end face of the fiber optic head 41 faces the microscope assembly 30, so that the end face of the fiber optic head 41 can be observed through the microscope assembly 30. By rotating the microscope assembly 30 and / or rotating the fiber optic head fixing unit 40, the microscope assembly 30 can check the cleanliness of the end face of the fiber optic head 41 from multiple angles, so as to clean the stains or tiny impurity particles on the fiber optic head 41 and reduce the probability of affecting the normal operation of the fiber laser. In addition, the fiber optic head inspection tool 100 has few restrictions on usage scenarios, is easy to carry, does not require additional equipment, occupies a small space, and is flexible to deploy.

[0037] In some embodiments, in order to facilitate the inspection of the optical fiber head 41, as shown in FIG. Figure 2 As shown, the microscope assembly 30 may include a first fixing base 31, a second fixing base 32 and a microscope 33. The first fixing base 31 is rotatably mounted on the base 20, as shown in FIG. Figure 3 As shown, the first fixing seat 31 can be mounted on the base 20 through the joint bearing 34, so that the first fixing seat 31 can be adjusted in multiple angles and directions through the joint bearing 34. The second fixing seat 32 is mounted on the first fixing seat 31, for example, as shown in FIG. Figure 2 As shown, the second fixing base 32 can be mounted on the first fixing base 31 by screws to facilitate the assembly and disassembly of the second fixing base 32. The first fixing base 31 and the second fixing base 32 are used to cooperate with each other to clamp at least a portion of the microscope 33 to fix the microscope 33 between the first fixing base 31 and the second fixing base 32.

[0038] Based on the above foundation, in order to further illustrate the installation of the microscope 33, as shown in FIG. Figure 4As shown, the surface of the first fixing base 31 that contacts the microscope 33 has a first recessed portion 311 extending inward, and the surface of the second fixing base 32 that contacts the microscope 33 has a second recessed portion 320 extending inward. Furthermore, to facilitate more stable installation, the inner surfaces of the first recessed portion 311 and the second recessed portion 320 are adapted to the outer contour of the microscope 33. The microscope 33 is placed between the first recessed portion 311 and the second recessed portion 320, and the second fixing base 32 is then mounted on the first fixing base 31 using screws, thereby completing the installation of the microscope 33. Furthermore, to reduce damage to the microscope 33, cushioning pads are attached to the first recessed portion 311 and the second recessed portion 320 to protect the microscope 33.

[0039] In some embodiments, in order to facilitate the inspection of the optical fiber head 41 through the microscope 33, as shown in FIG. Figure 5 As shown, the microscope assembly 30 may further include a light source 34. The light source 34 is mounted on the objective lens of the microscope 33 to provide light to the optical fiber head 41. To increase the illumination area, the light source 34 may be annular or the number of light sources 34 may be one, two, or three, which is not specifically limited in this embodiment of the utility model.

[0040] In some embodiments, in order to facilitate the adjustment of the relative position of the optical fiber head fixing unit 40 and the base 20, as shown in FIG. Figure 6 As shown, the optical fiber head fixing unit 40 may include a rotating frame 42, an optical fiber fixing seat 43, and a pressure plate 44. One end of the rotating frame 42 is rotatably mounted on the base 20. Specifically, one end of the rotating frame 42 and the base 20 can be connected by a rotating shaft 45 to enable the rotating frame 42 to rotate relative to the base 20. The rotating shaft 45 is respectively provided on the rotating frame 42 and the base 20. The optical fiber fixing seat 43 is mounted on the rotating frame 42. One end of the pressure plate 44 is rotatably connected to the optical fiber fixing seat 43 via a pin, allowing the pressure plate 44 to rotate relative to the optical fiber fixing seat 43.

[0041] like Figure 7 As shown, an adjustment screw 46 is rotatably connected to the optical fiber fixing seat 43. The adjustment screw 46 passes through the pressure plate 44 through the notch 440 on the side of the pressure plate 44 and is threadedly connected to the adjustment screw 46 through the embossed nut 47. By rotating the embossed nut 47 to move it toward the pressure plate 44 and abut against the pressure plate 44, the pressure plate 44 is fixed to the optical fiber fixing seat 43, and a mounting cavity 50 is formed between the optical fiber fixing seat 43 and the pressure plate 44. Figure 8 As shown, the optical fiber fixing seat 43 and the pressing plate 44 are used to cooperate to clamp at least a portion of the optical fiber head 41 to fix the optical fiber head 41 in the installation cavity 50 .

[0042] Based on the above situation, when fixing the optical fiber head 41, first place the optical fiber head 41 in the mounting cavity 50, with the end face of the optical fiber head 41 facing the microscope 33, and rotate the pressure plate 44 to abut against the outer surface of the optical fiber head 41, then rotate the adjustment screw 46 to the slot 440 on the side of the pressure plate 44, and tighten the embossed nut 47 toward the pressure plate 44 to fix the optical fiber head 41 in the mounting cavity 50.

[0043] In some embodiments, to further stabilize the relative position of the optical fiber head 41 and the optical fiber holder 43, the surface of the optical fiber holder 43 in contact with the optical fiber head 41 has an inwardly extending groove 430, that is, a mounting cavity 50 is formed between the groove 430 and the pressure plate 44. The groove 430 is used to limit the sliding of the optical fiber head 41.

[0044] In some embodiments, as Figure 9 As shown, the dimension D of the groove 430 in the first direction X gradually increases along the second direction Y. The first direction X and the second direction Y are perpendicular to each other, so that the optical fiber head 41 can be placed in the groove 430.

[0045] In some embodiments, the first direction X and the second direction Y are parallel to the reference plane M. The orthographic projection of the groove 430 on the reference plane M is V-shaped, and optical fiber heads 41 of different diameters can be placed in the groove 430 for self-centering.

[0046] In some embodiments, as Figure 10 As shown, the base 20 may include an adapter plate 21, a support rod 22, and a bottom plate 23. The first fixed seat 31 is rotatably mounted on one side of the adapter plate 21, that is, as described above, the first fixed seat 31 is mounted on the adapter plate 21 through a joint bearing, so that the first fixed seat 31 can be adjusted to different positions at multiple angles relative to the adapter plate 21. One end of the rotating frame 42 is rotatably mounted on the other side of the adapter plate 21, that is, the rotation of the rotating frame 42 and the adapter plate 21 is achieved through the rotating shaft 45 as described above, which will not be described in detail here. One end of the support rod 22 is mounted on the adapter plate 21. The bottom plate 23 is mounted on the other end of the support rod 22.

[0047] In another embodiment, in order to realize the rotation of the first fixed seat 31 relative to the adapter plate 21, so as to facilitate the inspection of the optical fiber head 41 through the microscope 33, a shell can be installed on the adapter plate 21, and the opening of the shell is set toward the first fixed seat 31. A sphere is clearance-fitted in the shell, and a part of the sphere extends out of the shell through the opening and is connected to the first fixed seat 31. In this way, the sphere rotates in the shell to drive the rotation of the first fixed seat 31 relative to the adapter plate 21, so as to adjust the angle of the microscope 33 to inspect the optical fiber head 41. Since the sphere is clearance-fitted with the shell, the tendency of the sphere to rotate is limited by the friction between the sphere and the inner wall of the shell, that is, when the sphere rotates to a certain position in the shell, the sphere stops rotating, thereby improving the stability of the microscope 33 in inspecting the optical fiber head 41.

[0048] In some embodiments, as Figure 10 As shown, the base 20 also includes an adjustment member 24. Figure 11 The adapter plate 21 is shown with an arcuate hole 210, the center of which is located at the connection between the adapter plate 21 and the rotating frame 42. One end of the adjusting member 24 passes through the arcuate hole 210 and is connected to the rotating frame 42. The adjusting member 24 moves within the arcuate hole 210 to adjust the relative position of the rotating frame 42 and the adapter plate 21. When the rotating frame 42 is rotationally connected to the adapter plate 21 via the rotating shaft 45, the rotating frame 42 rotates about the rotating shaft 45, allowing the adjusting member 24 to move freely within the arcuate hole 210. When the adjusting member 24 moves to a certain position, the relative position of the rotating frame 42 and the adapter plate 21 is fixed by the adjusting member 24.

[0049] Based on the above, in order to fix the relative position of the rotating frame 42 and the adapter plate 21 by the adjusting member 24, as shown in FIG. Figure 12 Shown with Figure 13As shown, the adjusting member 24 may include a threaded rod 241, a first gasket 242, and a second gasket 243. One end of the threaded member 241 is threadedly connected to the rotating frame 42 through the arc-shaped hole 210, the first gasket 242 and the second gasket 243 are sleeved on the threaded rod 241, the adapter plate 21 is located between the first gasket 242 and the second gasket 243, and the first gasket 242 is located between the rotating frame 42 and the adapter plate 21. By rotating the threaded rod 241, the free end of the threaded rod 241 moves toward the adapter plate 21. When the first gasket 242 and the second gasket 243 abut against the adapter plate 21 (the first The gasket 242 and the second gasket 243 clamp the adapter plate 21, and the threaded rod 241 fixes the relative position of the rotating frame 42 and the adapter plate 21. When the relative position of the rotating frame 42 and the adapter plate 21 needs to be readjusted, the threaded rod 241 is rotated to move the free end of the threaded rod 241 away from the adapter plate 21. When the threaded rod 241 is able to move freely within the arc-shaped hole 210, the relative position of the rotating frame 42 and the adapter plate 21 can be adjusted. In other words, by adjusting the relative position of the rotating frame 42 and the adapter plate 21 or the angle between the rotating frame 42 and the adapter plate 21, the relative angle or relative position between the optical fiber head 41 and the microscope 33 can be adjusted, thereby meeting the requirements of the multi-angle azimuth microscope 33 for inspecting the optical fiber head 41.

[0050] In some embodiments, in order to facilitate the adjustment of the angle between the adapter plate 21 and the bottom plate 23, the optical fiber head 41 can be inspected by the microscope 33 at multiple angles. Figure 14 As shown, the support rod 22 may include a first support rod 221, a second support rod 222, and an adjustment handle 223. One end of the first support rod 221 is connected to the adapter plate 21. One end of the second support rod 222 is connected to the base plate 23. The adjustment handle 223 is rotatably mounted at the junction of the other end of the first support rod 221 and the other end of the second support rod 222. The adjustment handle 223 is used to adjust the angle between the first support rod 221 and the second support rod 222 with each circumferential rotation.

[0051] Based on the above, in order to facilitate the installation of the first support rod 221 and the second support rod 222, as shown in FIG. Figure 15As shown, the first support rod 221 has a third recessed portion 2210 at one end thereof near the second support rod 222, and the second support rod 222 has a fourth recessed portion 2220 at one end thereof near the first support rod 221. That is, when the first support rod 221 and the second support rod 222 are installed, the third recessed portion 2210 and the fourth recessed portion 2220 are arranged opposite to each other and abut against each other. In addition, the adjustment handle 223 is threadedly connected and penetrates the third recessed portion 2210 and the fourth recessed portion 2220. That is, by rotating the adjustment handle 223 counterclockwise, the connection between the first support rod 221 and the second support rod 222 is loosened. By rotating the first support rod 221 about the adjustment handle 223 as an axis, the angle between the first support rod 221 and the second support rod 222 is adjusted. After the adjustment, the adjustment handle 223 is rotated clockwise to fix the first support rod 221 and the second support rod 222.

[0052] Based on the above, when inspecting the end face of the optical fiber head 41 using the microscope 33, the embodiment of the present invention uses three methods to adjust the inspection angle and orientation of the microscope 33 relative to the optical fiber head 41. First, the relative position of the microscope 33 and the adapter plate 21 is adjusted by rotating the first fixing seat 31 relative to the adapter plate 21. Second, the angle of the optical fiber head 41 relative to the microscope 33 is adjusted by rotating the rotating frame 42 relative to the adapter plate 21. Third, the angle between the first support rod 221 and the second support rod 222 is adjusted by adjusting the handle 223, thereby adjusting the inspection angle of the optical fiber head 41 inspection tool.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fiber optic head inspection tool, characterized in that: include: base; A microscope assembly, rotatably mounted on the base, for inspecting the optical fiber head; as well as The optical fiber head fixing unit is rotatably mounted on the base and arranged opposite to the microscope assembly. The optical fiber head fixing unit has an installation cavity, and the installation cavity is used to install the optical fiber head.

2. The optical fiber head inspection tool according to claim 1, characterized in that: The microscope assembly includes: a first fixing seat, rotatably mounted on the base; a second fixing base, mounted on the first fixing base; and The microscope, the first fixing seat and the second fixing seat are used to cooperate to clamp at least a portion of the microscope to fix the microscope between the first fixing seat and the second fixing seat.

3. The optical fiber head inspection tool according to claim 2, characterized in that: The microscope assembly further comprises: The light source is installed at the objective lens of the microscope to provide light to the optical fiber head.

4. The optical fiber head inspection tool according to claim 2, characterized in that: The optical fiber head fixing unit includes: A rotating frame, one end of which is rotatably mounted on the base; an optical fiber fixing seat, mounted on the rotating frame; and A pressing plate is mounted on the optical fiber fixing seat, and the installation cavity is formed between the optical fiber fixing seat and the pressing plate. The optical fiber fixing seat and the pressing plate are used to cooperate to clamp at least part of the optical fiber head to fix the optical fiber head in the installation cavity.

5. The optical fiber head inspection tool according to claim 4, characterized in that: The surface of the optical fiber fixing seat that contacts the optical fiber head has an inwardly extending groove.

6. The optical fiber head inspection tool according to claim 5, characterized in that: The size of the groove in the first direction gradually increases along the second direction, and the first direction and the second direction are perpendicular to each other.

7. The optical fiber head inspection tool according to claim 6, characterized in that: The first direction and the second direction are parallel to a reference surface, and an orthographic projection of the groove on the reference surface is V-shaped.

8. The optical fiber head inspection tool according to claim 4, characterized in that: The base comprises: an adapter plate, wherein the first fixing seat is rotatably mounted on one side of the adapter plate, and one end of the rotating frame is rotatably mounted on the other side of the adapter plate; a support rod, one end of which is mounted on the adapter plate; and The bottom plate is installed on the other end of the support rod.

9. The optical fiber head inspection tool according to claim 8, characterized in that: The base further comprises: An adjusting member is provided on the adapter plate, wherein an arc-shaped hole is formed, the center of the arc-shaped hole is located at the connection position between the adapter plate and the rotating frame, one end of the adjusting member passes through the arc-shaped hole and is connected to the rotating frame, and moves freely in the arc-shaped hole to adjust the relative position of the rotating frame and the adapter plate.

10. The optical fiber head inspection tool according to claim 8, characterized in that: The support rod comprises: A first support rod, one end of which is connected to the adapter plate; a second support rod, one end of which is connected to the bottom plate; and An adjustment handle is rotatably mounted at a position where the other end of the first support rod and the other end of the second support rod meet. The adjustment handle is used to adjust the angle between the first support rod and the second support rod in each circumferential rotation.

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