Fixing device for dark field focus lens

Abstract

The utility model discloses a fixing device for a dark field focus lens, which belongs to the technical field of focus lenses and comprises a main body. The fixing mechanism is arranged below the main body and comprises a fixing seat, a rotating mechanism and a driving mechanism; the fixing seat is arranged below the main body; the supporting plate is arranged in the fixed seat; the first sliding assembly is arranged on the lower surface of the supporting plate; the pressure buffering assembly is arranged in the first sliding assembly; the second sliding assembly is arranged on the lower surface of the first sliding assembly; the adsorption assembly is arranged in the main body; according to the utility model, through the arrangement of the fixing mechanism, the problems that the focusing quality and precision of light beams are affected and the normal operation of equipment is affected due to the fact that the focusing mirror may fall off due to vibration or other external forces are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of focusing mirrors, and in particular relates to a fixing device for a dark field focusing mirror. Background Art

[0002] The focusing mirror is an optical element whose main function is to focus the divergent laser beam on a specific plane to form a uniformly sized light spot to achieve precise marking, cutting or other laser processing processes. The design and manufacture of the focusing mirror requires precise control to ensure that the laser beam can form a high-quality focal point on the workpiece surface. This is one of the key accessories for equipment such as laser marking machines. The base fixation of the focusing mirror is crucial to its performance and service life. The base fixation of the focusing mirror is to ensure the stability and accuracy of the optical path system. A fixed base can prevent the focusing mirror from moving or tilting during use, causing the beam to be out of focus or blurred imaging. In addition, the fixed base also helps to maintain the focal length and scanning range of the focusing mirror, avoiding uneven or irregular light spots due to position changes.

[0003] In the dark field focusing mirror of the prior art, when the staff uses the focusing mirror for observation, the focusing mirror may fall off due to vibration or other external forces, thereby affecting the focusing quality and accuracy of the light beam and the normal operation of the equipment, and may also pose a threat to the safety of the operator and indirectly affect work efficiency. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a fixing device for a dark-field focusing mirror, which has the advantage of stably fixing the focusing mirror base when the focusing mirror is in use, and solves the problem that the focusing mirror may fall off due to vibration or other external forces in the existing dark-field focusing mirror, thereby affecting the focusing quality and accuracy of the light beam and the normal operation of the equipment, and may also pose a threat to the safety of the operator, indirectly affecting the work efficiency.

[0005] The utility model is implemented as follows: a fixing device for a dark field focusing mirror comprises:

[0006] main body;

[0007] Fixing mechanism: The fixing mechanism is arranged below the main body and includes:

[0008] Fixed seat: The fixed seat is arranged below the main body;

[0009] Support plate: the support plate is arranged inside the fixing seat;

[0010] First sliding assembly: the first sliding assembly is arranged on the lower surface of the support plate;

[0011] Pressure relief component: the pressure relief component is arranged inside the first sliding component;

[0012] Second sliding component: the second sliding component is arranged on the lower surface of the first sliding component;

[0013] Adsorption component: the adsorption component is arranged inside the main body;

[0014] Electric cylinder: The upper surface of the electric cylinder is fixedly connected to the inside of the fixing seat.

[0015] As a preferred embodiment of the present invention, two first sliding assemblies are provided, and the two first sliding assemblies include:

[0016] First slider: the upper surface of the first slider is fixedly connected to the lower surface of the support plate;

[0017] Sliding block: the sliding block is arranged inside the fixing seat;

[0018] First sliding groove: the first sliding groove is opened on the upper surface of the sliding block, and the outer surface of the first sliding block is slidably connected to the inner surface of the first sliding groove.

[0019] As a preferred embodiment of the present invention, two pressure relief assemblies are provided, and the two pressure relief assemblies include:

[0020] First pressure relief spring: two first pressure relief springs are provided, the upper surfaces of the two first pressure relief springs are fixedly connected to the lower surface of the support plate, and the lower surface of the first pressure relief spring is fixedly connected to the inner surface of the fixing seat;

[0021] Connecting rod: both left and right ends of the connecting rod are fixedly connected to the inner surface of the first sliding groove;

[0022] Second pressure relief spring: the second pressure relief spring is sleeved on the outer surface of the connecting rod, the opposite side of the second pressure relief spring is fixedly connected to the inner surface of the first sliding groove, and the opposite side of the second pressure relief spring is fixedly connected to the opposite side of the first sliding block.

[0023] As a preferred embodiment of the present invention, two second sliding assemblies are provided, and the two second sliding assemblies include:

[0024] Second sliding groove: the second sliding groove is provided inside the fixing seat;

[0025] Second sliding block: the outer surface of the second sliding block is slidably connected to the inner surface of the second sliding groove, and the upper surface of the second sliding block is fixedly connected to the lower surface of the sliding block.

[0026] As a preferred embodiment of the present invention, two adsorption components are provided, and the two adsorption components include:

[0027] Rotating rod: both the front and rear ends of the rotating rod are rotatably connected to the inner surface of the fixing seat through a rotating shaft;

[0028] Adsorption plate: The inner surface of the adsorption plate is fixedly connected to the outer surface of the rotating rod, and the rotating rod runs through the interior of the adsorption plate.

[0029] As a preferred embodiment of the present invention, a transmission assembly is provided inside the fixing seat, and the transmission assembly includes:

[0030] Slide rail: two slide rails are provided, and both slide rails are fixedly connected to the inner surface of the fixed seat;

[0031] Sliding member: two sliding members are provided, the inner surfaces of the two sliding members are slidably connected to the outer surface of the slide rail, and the upper surface of the sliding member is provided with a connecting component;

[0032] Tooth plate: two tooth plates are provided, and the upper surfaces of the two tooth plates are fixedly connected to the inner surface of the sliding member;

[0033] Gear: The outer surface of the gear and the outer surface of the tooth plate are in a mutually meshing relationship.

[0034] As a preferred embodiment of the present invention, the connection assembly includes:

[0035] “L”-shaped connecting rod: the rear end face of the “L”-shaped connecting rod is fixedly connected to the output end of the electric cylinder, and the upper end face of the “L”-shaped connecting rod is fixedly connected to the lower end face of the sliding member;

[0036] Special-shaped fixing rod: the upper surface of the special-shaped fixing rod is fixedly connected to the lower surface of the gear, and the left and right sides of the special-shaped fixing rod are fixedly connected to the inside of the fixing seat;

[0037] Special-shaped connecting rod: the lower end surface of the special-shaped connecting rod is fixedly connected to the upper surface of the sliding member;

[0038] Rotating plates: Two rotating plates are provided, and the left and right sides of the two rotating plates are rotatably connected with the side of the special-shaped connecting rod close to the rotating plate through a rotating shaft.

[0039] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0040] 1. The utility model is provided with a fixing mechanism. When the focusing lens needs to be fixed during use, the staff can put the focusing lens on the upper surface of the support plate inside the fixing seat. At the same time, the staff needs to press the focusing lens base to increase the downward pressure of the focusing lens, so that the support plate moves downward under the action of the pressure. When the support plate moves downward, the first pressure relief spring is squeezed to deform the first pressure relief spring, and the first slider is driven to move downward. When the first slider descends, the sliding block is squeezed to move the sliding block to both sides. Under the movement of the sliding block, the first slider slides inside the first sliding groove. The opposite side of the second pressure-relief spring is fixedly connected to the opposite side of the first slider, and the opposite side of the second pressure-relief spring is fixedly connected to the inner surface of the sliding groove. Therefore, when the first slider and the sliding block move, the second pressure-relief spring becomes longer. When the sliding block moves to both sides, the sliding block drives the second slider to slide along the inner wall of the second sliding groove with the sliding block to both sides. When the opposite side of the sliding block hits the opposite side of the adsorption plate, the upper end of the sliding block rotates inward with the rotating rod as the center until the opposite side of the adsorption plate is tightly fitted with the outer surface of the focusing lens, thereby achieving the effect of stably fixing the focusing lens.

[0041] 2. The utility model sets a transmission component and a connecting component. The electric cylinder inside the fixed seat starts to operate under the action of the controller. The electric cylinder drives the "L"-shaped connecting rod to move, and the "L"-shaped connecting rod drives the sliding member to operate together, so that the sliding member slides inward along the slide rail, and the sliding member drives the toothed plate to move inward. Since the toothed plate and the gear are in a mutual meshing relationship, the toothed plate moves inward to drive the gear to rotate, and the gear drives another toothed plate to move, and the toothed plate on the other side drives another sliding member to move inward. Since the sliding member is fixedly connected to the special-shaped connecting rod, the sliding member drives the special-shaped connecting rod to move inward together. When the special-shaped connecting rod moves inward, it drives the rotating plate to move inward, so that the suction cup on the rotating plate can be in close contact with the outer surface of the focusing lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of a three-dimensional structure provided by an embodiment of the utility model;

[0043] Figure 2 It is a full cross-sectional schematic diagram provided by an embodiment of the utility model;

[0044] Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0045] Figure 4 It is a full cross-sectional schematic diagram from another viewing angle provided by an embodiment of the utility model.

[0046] In the figure: 1. main body; 2. fixing mechanism; 210. fixing seat; 220. supporting plate; 230. first sliding component; 231. first sliding block; 232. sliding block; 233. first sliding groove; 240. pressure relief component; 241. first pressure relief spring; 242. connecting rod; 243. second pressure relief spring; 250. second sliding component; 251. second sliding groove; 252. second sliding block; 260. adsorption component; 261. rotating rod; 262. adsorption plate; 270. electric cylinder; 3. transmission component; 301. slide rail; 302. sliding member; 303. tooth plate; 304. gear; 4. connecting component; 401. "L"-shaped connecting rod; 402. special-shaped fixing rod; 403. special-shaped connecting rod; 404. rotating plate. DETAILED DESCRIPTION

[0047] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0048] The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

[0049] like Figures 1 to 4 As shown, a fixing device for a dark field focusing mirror provided by an embodiment of the utility model comprises:

[0050] Subject 1;

[0051] Fixing mechanism 2: The fixing mechanism 2 is arranged below the main body 1 and includes:

[0052] Fixed seat 210: The fixed seat 210 is disposed below the main body 1;

[0053] Support plate 220: The support plate 220 is disposed inside the fixing base 210;

[0054] First sliding assembly 230: The first sliding assembly 230 is disposed on the lower surface of the support plate 220;

[0055] Pressure relief assembly 240: The pressure relief assembly 240 is disposed inside the first sliding assembly 230;

[0056] Second sliding assembly 250: The second sliding assembly 250 is disposed on the lower surface of the first sliding assembly 230;

[0057] Adsorption component 260: The adsorption component 260 is disposed inside the main body 1;

[0058] Electric cylinder 270 : The upper surface of the electric cylinder 270 is fixedly connected to the inside of the fixing seat 210 .

[0059] refer to Figure 3 As shown, two first sliding assemblies 230 are provided, and the two first sliding assemblies 230 include:

[0060] First slider 231: The upper surface of the first slider 231 is fixedly connected to the lower surface of the support plate 220;

[0061] Sliding block 232: The sliding block 232 is disposed inside the fixing base 210;

[0062] First sliding groove 233 : The first sliding groove 233 is formed on the upper surface of the sliding block 232 , and the outer surface of the first sliding block 231 is slidably connected to the inner surface of the first sliding groove 233 .

[0063] The above scheme is adopted: when the focusing mirror needs to be fixed, the staff can place the focusing mirror into the upper surface of the support plate 220 inside the fixing seat 210, and at the same time the staff needs to press the focusing mirror base to increase the downward pressure of the focusing mirror so that the support plate 220 moves downward under the action of pressure. When the support plate 220 moves downward, it drives the first slider 231 to move downward. While the first slider 231 descends, it squeezes the sliding block 232 so that the sliding block 232 moves to both sides. Under the movement of the sliding block 232, the first slider 231 slides inside the first sliding groove 233, so as to facilitate the sliding block 232 to move to both sides under the action of the pressure of the support plate 220.

[0064] refer to Figure 3 As shown, two pressure relief components 240 are provided, and the two pressure relief components 240 include:

[0065] First decompression spring 241: Two first decompression springs 241 are provided, the upper surfaces of the two first decompression springs 241 are fixedly connected to the lower surface of the support plate 220, and the lower surface of the first decompression spring 241 is fixedly connected to the inner surface of the fixing seat 210;

[0066] Connecting rod 242: Both left and right ends of the connecting rod 242 are fixedly connected to the inner surface of the first sliding groove 233;

[0067] The second decompression spring 243 is sleeved on the outer surface of the connecting rod 242 , and the opposite side of the second decompression spring 243 is fixedly connected to the inner surface of the first sliding groove 233 , and the opposite side of the second decompression spring 243 is fixedly connected to the opposite side of the first sliding block 231 .

[0068] The above scheme is adopted: when the support plate 220 descends, the first pressure relief spring 241 is squeezed to deform the first pressure relief spring 241; when the first slider 231 moves downward on the inner wall of the first sliding groove 233, since the opposite side of the second pressure relief spring 243 is fixedly connected to the opposite side of the first slider 231, and the opposite side of the second pressure relief spring 243 is fixedly connected to the inner surface of the first sliding groove 233, when the first slider 231 and the sliding block 232 move, the second pressure relief spring 243 becomes longer; if the focusing mirror is removed from the support plate 220, the second pressure relief spring 243 will pull the sliding block 232, and the first pressure relief spring 241 will release the elastic force upward, and finally the initial state is restored.

[0069] refer to Figure 3 As shown, two second sliding assemblies 250 are provided, and the two second sliding assemblies 250 include:

[0070] Second sliding groove 251: The second sliding groove 251 is formed inside the fixing base 210;

[0071] Second sliding block 252 : The outer surface of the second sliding block 252 is slidably connected to the inner surface of the second sliding groove 251 , and the upper surface of the second sliding block 252 is fixedly connected to the lower surface of the sliding block 232 .

[0072] With the above solution, when the first sliding block 232 moves to both sides, the sliding block 232 drives the second sliding block 252 to slide along the inner wall of the second sliding groove 251 with the sliding block 232 to both sides, thereby achieving the effect of assisting the sliding block 232 to move to both sides.

[0073] refer to Figure 2 As shown, two adsorption components 260 are provided, and the two adsorption components 260 include:

[0074] Rotating rod 261: Both front and rear ends of the rotating rod 261 are rotatably connected to the inner surface of the fixing seat 210 through a rotating shaft;

[0075] Adsorption plate 262 : The inner surface of the adsorption plate 262 is fixedly connected to the outer surface of the rotating rod 261 , and the rotating rod 261 passes through the interior of the adsorption plate 262 .

[0076] The above solution is adopted: when the sliding block 232 moves to both sides, the opposite side of the sliding block 232 hits the opposite side of the adsorption plate 262, so that it rotates inward with the rotating rod 261 as the center, until the opposite side of the adsorption plate 262 is tightly fitted with the outer surface of the focusing lens, thereby achieving the effect of fixing the focusing lens.

[0077] refer to Figure 4 As shown, a transmission assembly 3 is disposed inside the fixing seat 210, and the transmission assembly 3 includes:

[0078] Slide rail 301: Two slide rails 301 are provided, and both slide rails 301 are fixedly connected to the inner surface of the fixing seat 210;

[0079] Sliding member 302: Two sliding members 302 are provided, the inner surfaces of the two sliding members 302 are slidably connected to the outer surface of the slide rail 301, and the upper surface of the sliding member 302 is provided with a connecting component 4;

[0080] Tooth plates 303: Two tooth plates 303 are provided, and the upper surfaces of the two tooth plates 303 are fixedly connected to the inner surface of the sliding member 302;

[0081] Gear 304: The outer surface of the gear 304 and the outer surface of the toothed plate 303 are in a mutually meshing relationship.

[0082] The above scheme is adopted: when the focusing lens is placed on the upper surface of the support plate 220, the controller controls the electric cylinder 270 to start operating, and the electric cylinder 270 indirectly drives the sliding member 302, so that the sliding member 302 slides inward along the slide rail 301, and the sliding member 302 drives the tooth plate 303 to move inward. Since the tooth plate 303 and the gear 304 are in a mutually meshing relationship, the tooth plate 303 moves inward to drive the gear 304 to rotate, and the gear 304 drives the other tooth plate 303 to move, and the tooth plate 303 on the other side drives the other sliding member 302 to move inward.

[0083] refer to Figure 4 As shown, the connection component 4 includes:

[0084] “L”-shaped connecting rod 401: The rear end face of the “L”-shaped connecting rod 401 is fixedly connected to the output end of the electric cylinder 270, and the upper end face of the “L”-shaped connecting rod 401 is fixedly connected to the lower end face of the sliding member 302;

[0085] Special-shaped fixing rod 402: The upper surface of the special-shaped fixing rod 402 is fixedly connected to the lower surface of the gear 304, and the left and right sides of the special-shaped fixing rod 402 are fixedly connected to the inside of the fixing seat 210;

[0086] Special-shaped connecting rod 403: The lower end surface of the special-shaped connecting rod 403 is fixedly connected to the upper surface of the sliding member 302;

[0087] Rotating plate 404: Two rotating plates 404 are provided, and the left and right sides of the two rotating plates 404 are rotatably connected to the side of the special-shaped connecting rod 403 close to the rotating plate 404 through a rotating shaft.

[0088] The above scheme is adopted: when the electric cylinder 270 starts to operate, the electric cylinder 270 drives the "L"-shaped connecting rod 401 to move, and the "L"-shaped connecting rod 401 drives the sliding member 302 to operate together. Since the sliding member 302 is fixedly connected to the special-shaped connecting rod 403, the sliding member 302 drives the special-shaped connecting rod 403 to move inward together. When the special-shaped connecting rod 403 moves inward, it drives the rotating plate 404 to move inward until the opposite side of the rotating plate 404 is in close contact with the outer surface of the focusing lens, thereby finally achieving a stabilizing effect.

[0089] The working principle of this utility model:

[0090] During use, when the focusing lens needs to be fixed, the staff can put the focusing lens into the upper surface of the support plate 220 inside the fixing seat 210, and at the same time, the staff needs to press the focusing lens base to increase the downward pressure of the focusing lens, so that the support plate 220 moves downward under the action of the pressure. When the support plate 220 moves downward, the first pressure relief spring 241 is squeezed to deform the first pressure relief spring 241, and at the same time, the first slider 231 is driven to move downward. When the first slider 231 descends, the sliding block 232 is squeezed to make the sliding block 232 move to both sides. The first slider 231 slides inside the first sliding groove 233. Since the opposite side of the second pressure-relieving spring 243 is fixedly connected to the opposite side of the first slider 231, and the opposite side of the second pressure-relieving spring 243 is fixedly connected to the inner surface of the first sliding groove 233, when the first slider 231 and the sliding block 232 move, the second pressure-relieving spring 243 becomes longer. When the first sliding block 232 moves to both sides, the sliding block 232 drives the second slider 252 to slide along the inner wall of the second sliding groove 251 with the sliding block 232 to both sides. The side of the adsorption plate 262 is hit, so that the upper end of the sliding block 232 rotates inward with the rotating rod 261 as the center, until the opposite side of the adsorption plate 262 is tightly fitted with the outer surface of the focusing lens; the electric cylinder 270 inside the fixed seat 210 starts to operate under the action of the controller, and the electric cylinder 270 drives the "L"-shaped connecting rod 401 to move, and the "L"-shaped connecting rod 401 drives the sliding member 302 to operate together, so that the sliding member 302 slides inward along the slide rail 301, and the sliding member 302 drives the tooth plate 303 to move inward. The toothed plate 303 is in mutual meshing relationship with the gear 304, so the toothed plate 303 moves inward to drive the gear 304 to rotate, and the gear 304 drives the other toothed plate 303 to move, and the toothed plate 303 on the other side drives the other sliding member 302 to move inward. Since the sliding member 302 is fixedly connected to the special-shaped connecting rod 403, the sliding member 302 drives the special-shaped connecting rod 403 to move inward together. When the special-shaped connecting rod 403 moves inward, it drives the rotating plate 404 to move inward until the opposite side of the rotating plate 404 is in close contact with the outer surface of the focusing lens, thereby finally achieving a stabilizing effect.

[0091] In summary: this dark field focusing mirror fixing device, through the main body 1, the fixing mechanism 2, the transmission component 3 and the connecting component 4, solves the problem that the focusing mirror may fall off due to vibration or other external forces in the existing dark field focusing mirror, thereby affecting the focusing quality and accuracy of the light beam and the normal operation of the equipment, and may also pose a threat to the safety of the operator and indirectly affect the work efficiency.

[0092] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixing device for a dark field focusing lens, characterized in that: include: Subject (1); Fixing mechanism (2): the fixing mechanism (2) is arranged below the main body (1), and comprises: Fixed seat (210): the fixed seat (210) is arranged below the main body (1); Support plate (220): the support plate (220) is arranged inside the fixing seat (210); A first sliding component (230): the first sliding component (230) is arranged on the lower surface of the support plate (220); Pressure relief component (240): the pressure relief component (240) is arranged inside the first sliding component (230); A second sliding component (250): the second sliding component (250) is arranged on the lower surface of the first sliding component (230); Adsorption component (260): the adsorption component (260) is arranged inside the main body (1); Electric cylinder (270): the upper surface of the electric cylinder (270) is fixedly connected to the interior of the fixing seat (210).

2. A fixing device for a dark field focusing lens as claimed in claim 1, characterized in that: Two first sliding assemblies (230) are provided, and the two first sliding assemblies (230) include: A first sliding block (231): the upper surface of the first sliding block (231) is fixedly connected to the lower surface of the support plate (220); Sliding block (232): the sliding block (232) is arranged inside the fixing seat (210); First sliding groove (233): the first sliding groove (233) is opened on the upper surface of the sliding block (232), and the outer surface of the first sliding block (231) is slidably connected to the inner surface of the first sliding groove (233).

3. A fixing device for a dark field focusing lens as claimed in claim 2, characterized in that: Two pressure relief assemblies (240) are provided, and the two pressure relief assemblies (240) include: First pressure relief spring (241): two first pressure relief springs (241) are provided, the upper surfaces of the two first pressure relief springs (241) are fixedly connected to the lower surface of the support plate (220), and the lower surface of the first pressure relief spring (241) is fixedly connected to the inner surface of the fixing seat (210); Connecting rod (242): both left and right ends of the connecting rod (242) are fixedly connected to the inner surface of the first sliding groove (233); Second pressure relief spring (243): The second pressure relief spring (243) is sleeved on the outer surface of the connecting rod (242), the opposite side of the second pressure relief spring (243) is fixedly connected to the inner surface of the first sliding groove (233), and the opposite side of the second pressure relief spring (243) is fixedly connected to the opposite side of the first sliding block (231).

4. A fixing device for a dark field focusing lens as claimed in claim 2, characterized in that: Two second sliding assemblies (250) are provided, and the two second sliding assemblies (250) include: Second sliding groove (251): the second sliding groove (251) is disposed inside the fixing seat (210); Second sliding block (252): the outer surface of the second sliding block (252) is slidably connected to the inner surface of the second sliding groove (251), and the upper surface of the second sliding block (252) is fixedly connected to the lower surface of the sliding block (232).

5. A fixing device for a dark field focusing lens as claimed in claim 1, characterized in that: Two adsorption components (260) are provided, and the two adsorption components (260) include: Rotating rod (261): both front and rear ends of the rotating rod (261) are rotatably connected to the inner surface of the fixing seat (210) via a rotating shaft; Adsorption plate (262): the inner surface of the adsorption plate (262) is fixedly connected to the outer surface of the rotating rod (261), and the rotating rod (261) passes through the interior of the adsorption plate (262).

6. A fixing device for a dark field focusing lens as claimed in claim 1, characterized in that: A transmission assembly (3) is arranged inside the fixing seat (210), and the transmission assembly (3) comprises: Slide rail (301): two slide rails (301) are provided, and both slide rails (301) are fixedly connected to the inner surface of the fixing seat (210); Sliding member (302): two sliding members (302) are provided, the inner surfaces of the two sliding members (302) are slidably connected to the outer surface of the slide rail (301), and the upper surface of the sliding member (302) is provided with a connecting component (4); Tooth plate (303): two tooth plates (303) are provided, and the upper surfaces of the two tooth plates (303) are fixedly connected to the inner surface of the sliding member (302); Gear (304): The outer surface of the gear (304) and the outer surface of the toothed plate (303) are in a mutually meshing relationship.

7. A fixing device for a dark field focusing lens as claimed in claim 6, characterized in that: The connection component (4) comprises: "L"-shaped connecting rod (401): the rear end face of the "L"-shaped connecting rod (401) is fixedly connected to the output end of the electric cylinder (270), and the upper end face of the "L"-shaped connecting rod (401) is fixedly connected to the lower end face of the sliding member (302); Special-shaped fixing rod (402): the upper surface of the special-shaped fixing rod (402) is fixedly connected to the lower surface of the gear (304), and the left and right sides of the special-shaped fixing rod (402) are both fixedly connected to the inside of the fixing seat (210); Special-shaped connecting rod (403): the lower end surface of the special-shaped connecting rod (403) is fixedly connected to the upper surface of the sliding member (302); Rotating plate (404): two rotating plates (404) are provided, and the left and right sides of the two rotating plates (404) are rotatably connected to the side of the special-shaped connecting rod (403) close to the rotating plate (404) via a rotating shaft.

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