Laser etching equipment
By introducing automatic clamping mechanism and laser printing assembly into the laser etching equipment, the time-consuming and positioning error problems caused by manual fixing and adjustment in traditional laser etching are solved, and a more efficient and accurate processing process is achieved.
Patent Information
- Application Number
- CN202510240641.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-04-04
AI Technical Summary
During traditional laser etching, it is necessary to manually fix the product to be processed and manually adjust the position, which is time-consuming and labor-intensive and prone to positioning errors caused by human factors, affecting product quality and consistency.
A laser etching device is designed, including a clamping mechanism for laser etching and a laser printing assembly. Automatic clamping of products is realized through automatic clamping mechanism and automatic etching of laser printing assembly, reducing the dependence on operator skills.
Through automatic clamping and laser printing, production efficiency and processing accuracy are significantly improved, human errors are reduced, and processing quality is improved.
Smart Images

Figure CN119747901A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of laser etching, in particular to laser etching equipment. Background Art
[0002] In the field of modern manufacturing, laser etching technology is widely used in marking, pattern drawing and preparation of functional structures of various materials, such as screen making, due to its high precision, high efficiency and non-contact processing characteristics; In the traditional laser etching process, it is usually necessary to manually fix the product to be processed on the workbench and manually adjust the position, which is not only time-consuming and laborious, but also prone to positioning errors due to human factors, affecting the quality and consistency of the final product. Therefore, we have made improvements to this and proposed laser etching equipment. Summary of the invention
[0003] The purpose of the present invention is to solve the problem that the current method of manually fixing the product to be processed on the workbench and manually adjusting the position is not only time-consuming and labor-intensive, but also easily leads to positioning errors due to human factors.
[0004] In order to achieve the above-mentioned purpose of the invention, the present invention provides a laser etching device to improve the above-mentioned problem.
[0005] The specific application is as follows: The laser etching equipment includes a base frame, a protective shell is fixedly installed on the top of the base frame, a vertical plate located in the protective shell is installed on the top of the base frame, a clamping mechanism for laser etching is arranged on the front of the vertical plate, the clamping mechanism for laser etching is used to clamp the etched product, and a laser engraving component for laser etching is also arranged on the front of the vertical plate, and the laser engraving component for laser etching is used to laser etch the product.
[0006] As a preferred technical solution of the present application, the clamping mechanism for laser etching includes a lifting structure and a mounting frame installed on the front of the vertical plate, the lifting structure and the mounting frame are connected to support rods, and a plurality of clamping parts are provided on the sides of the two support rods away from each other, and the clamping parts cooperate with the support rods to clamp and fix the product; The clamping part comprises a support frame fixedly mounted on a support rod, a cylinder is arranged in the support frame, and a piston rod of the cylinder passes through the support frame and is connected to a clamping piece.
[0007] As a preferred technical solution of the present application, the clamping member includes a connecting rod installed on the cylinder piston rod, a threaded rod is threadedly connected to the connecting rod, and a cushion block is connected to one end of the threaded rod close to the support rod.
[0008] As a preferred technical solution of the present application, the lifting structure includes two first support seats and two second support seats installed on the front of the vertical plate, and the two first support seats and the two second support seats are each provided with a first synchronous wheel, and a first synchronous belt is connected between each two first synchronous wheels; The two first synchronous belts are both connected to a connecting frame, and the two connecting frames are both connected to corresponding support rods.
[0009] As a preferred technical solution of the present application, a drive motor is installed on the vertical plate, and the output shaft of the drive motor is connected to one of the first synchronous wheels.
[0010] As a preferred technical solution of the present application, the two first support seats are connected to a second synchronous wheel, the two second synchronous wheels are respectively connected to two of the first synchronous wheels, and a second synchronous belt is connected between the two second synchronous wheels.
[0011] As a preferred technical solution of the present application, the laser engraving assembly for laser etching includes a first linear module installed on the front side of the vertical plate, and the first linear module is connected to a second linear module; a first mounting plate is arranged on the second linear module, and a protective cover is arranged on the front side of the first mounting plate, and a projection structure located inside the protective cover, a detection structure and a laser etcher respectively located on both sides of the projection structure are also arranged on the front side of the first mounting plate.
[0012] As a preferred technical solution of the present application, the projection structure includes a projection module installed on the front side of the first mounting plate, the projection module is connected to a projection lens, and the projection lens is connected to a projection focusing tube.
[0013] As a preferred technical solution of the present application, a projection reflector is installed on the front of the first mounting plate, the projection reflector is located below the projection focusing cylinder, and the laser etcher is located on the side of the projection reflector.
[0014] As a preferred technical solution of the present application, the detection structure includes a second mounting plate fixedly mounted on the side of the first mounting plate, a fixing seat is fixedly mounted on the front of the second mounting plate, a sliding seat is slidably connected to the inner wall of the fixing seat, a fine-tuning scale is connected between the sliding seat and the fixing seat, and a visual detection camera is installed on the front of the sliding seat; A side plate is installed at the bottom of the sliding seat, and a laser reflector located below the visual inspection camera is installed on the side plate.
[0015] Compared with the prior art, the present invention has the following beneficial effects: In the scheme of this application: The present application provides a clamping mechanism for laser etching and a laser engraving component for laser etching. The clamping mechanism for laser etching can realize automatic clamping of the product, which greatly improves the versatility and applicability of the equipment and reduces the dependence on the operator's skills. The laser engraving component for laser etching can realize automatic etching of the product, which significantly improves production efficiency and processing accuracy, reduces human errors, and improves processing quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the structure of the laser etching equipment provided for this application; Figure 2 A schematic diagram of the structure of the top of the chassis of the laser etching equipment provided in this application; Figure 3 A schematic diagram of the structure of the clamping mechanism for laser etching provided in this application; Figure 4 A schematic diagram of the partial structure of the clamping mechanism for laser etching provided in this application; Figure 5 Provided for this application Figure 3 The enlarged structural diagram at A in the middle; Figure 6 A schematic diagram of the structure of the laser engraving assembly for laser etching provided in this application; Figure 7 A schematic diagram of the projection structure, detection structure and laser etcher provided in this application; Figure 8 A schematic diagram of the projection structure, detection structure and laser etcher provided in this application; Fig. 9 This is a schematic structural diagram of the projection structure, detection structure and laser etcher provided in the present application from another perspective.
[0017] Indicated in the figure: 1. Base frame; 101. Reinforcement frame; 2. Vertical plate; 3. Clamping mechanism for laser etching; 301. Mounting frame; 302. Support frame; 303. Threaded rod; 304. Pad; 305. First support seat; 306. Second support seat; 307. First synchronous wheel; 308. First synchronous belt; 309. Second synchronous wheel; 310. Drive motor; 311. First guide rail; 312. First slide seat; 313. Connecting frame; 314. Second synchronous belt; 315. Support rod; 316. Connecting rod; 317. Cylinder; 318. Pressing wheel; 4. Laser engraving assembly for laser etching; 401. First linear module; 402 , second linear module; 403, second guide rail; 404, protective cover; 405, first mounting plate; 406, projection module; 407, upper fixing plate; 408, connecting screw; 409, lower fixing plate; 410, spring; 411, projection focusing tube; 412, third guide rail; 413, projection reflector; 414, laser etcher; 415, third linear module; 416, projection lens; 417, second mounting plate; 418, fixed seat; 419, sliding seat; 420, fine-tuning scale; 421, visual inspection camera; 422, side panel; 423, laser reflector; 424, light source; 5, protective shell. DETAILED DESCRIPTION
[0018] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0021] Example 1, please refer to Figure 1-Figure 9, laser etching equipment, including a base frame 1, a protective shell 5 is fixedly installed on the top of the base frame 1, a vertical plate 2 located in the protective shell 5 is installed on the top of the base frame 1, and a clamping mechanism 3 for laser etching is arranged on the front of the vertical plate 2, and the clamping mechanism 3 for laser etching is used to clamp the etched product, and a laser engraving component 4 for laser etching is also arranged on the front of the vertical plate 2, and the laser engraving component 4 for laser etching is used to laser etch the product; the present application sets the clamping mechanism 3 for laser etching and the laser engraving component 4 for laser etching, and the clamping mechanism 3 for laser etching can realize automatic clamping of the product, which greatly improves the versatility and applicability of the equipment, reduces the dependence on the skills of the operator, and realizes automatic etching of the product through the laser engraving component 4 for laser etching, which significantly improves the production efficiency and processing accuracy, reduces human errors, and realizes the improvement of processing quality, and a reinforcement frame 101 is installed between the base frame 1 and the back of the vertical plate 2.
[0022] Example 2, further optimizes the laser etching equipment provided in Example 1, specifically, as follows Figure 3-Figure 5 As shown, the clamping mechanism 3 for laser etching includes a lifting structure and a mounting frame 301 installed on the front side of the vertical plate 2, the lifting structure is located above the mounting frame 301, and the lifting structure and the mounting frame 301 are connected with support rods 315, and a plurality of clamping parts are arranged on the sides of the two support rods 315 away from each other, and the clamping parts cooperate with the support rods 315 to clamp and fix the product. In the field of laser etching technology, accurately and stably fixing the workpiece is one of the key steps to achieve high-quality processing; traditional clamping methods often use a single-size fixture, which is difficult to adapt to workpieces of different sizes, which not only limits the processing range, but also may cause a decrease in processing accuracy or even damage to the workpiece due to unstable clamping; the present application arranges support rods 315 on the mounting frame 301 and the lifting structure, and clamping parts are arranged on the two support rods 315, the lifting structure can drive the corresponding clamping parts to rise and fall, thereby achieving effective fixation of workpieces of different sizes, thereby adapting to workpieces of different sizes, and greatly broadening the processing application scope of the present application.
[0023] Furthermore, the clamping part includes a support frame 302 fixedly mounted on a support rod 315, a cylinder 317 is arranged inside the support frame 302, a piston rod of the cylinder 317 passes through the support frame 302 and is connected to a clamping member, the support frame 302 can realize installation support for the cylinder 317, and the clamping member can cooperate with the support rod 315 to realize clamping and fixing of the rod.
[0024] Furthermore, the clamping member includes a connecting rod 316 installed on the piston rod of the cylinder 317, and a threaded rod 303 is threadedly connected to the connecting rod 316. The end of the threaded rod 303 close to the support rod 315 is connected to a pad 304. The cylinder 317 can drive the connecting rod 316, the threaded rod 303 and the pad 304 to move. When the pad 304 approaches the support rod 315, it can cooperate with the support rod 315 to clamp and fix the workpiece, and when the pad 304 moves away from the support rod 315, the fixation is released. Rotating the threaded rod 303 can adjust the position of the pad 304 to meet the fixing requirements of workpieces of different thicknesses.
[0025] Furthermore, the lifting structure includes two first support seats 305 and two second support seats 306 installed on the front side of the vertical plate 2, and the two first support seats 305 and the two second support seats 306 are each provided with a first synchronous wheel 307, and a first synchronous belt 308 is connected between each two first synchronous wheels 307, and the arrangement of the first support seat 305 and the second support seat 306 provides effective support for the first synchronous wheel 307 and the first synchronous belt 308; Furthermore, the two first synchronous belts 308 are both connected to a connecting frame 313, and the two connecting frames 313 are both connected to corresponding support rods 315. When the first synchronous belts 308 rotate, they can drive the corresponding support rods 315 to rise and fall through the connecting frames 313, and then adjust according to workpieces of different sizes.
[0026] Furthermore, a driving motor 310 is installed on the vertical plate 2, and the output shaft of the driving motor 310 is connected to one of the first synchronous wheels 307. The driving motor 310 can drive the first synchronous wheel 307 connected thereto to rotate, thereby driving the first synchronous belt 308 to rotate.
[0027] Furthermore, the two first support seats 305 are connected to second synchronous wheels 309, and the two second synchronous wheels 309 are respectively connected to two of the first synchronous wheels 307. A second synchronous belt 314 is connected between the two second synchronous wheels 309. The cooperation between the second synchronous wheels 309 and the second synchronous belt 314 can realize the synchronous rotation of the two first synchronous belts 308.
[0028] Furthermore, a pressure wheel 318 is installed on one of the first support seats 305 by bolts, and the outer surface of the pressure wheel 318 is in contact with the second synchronous belt 314. The pressure wheel 318 can tension the second synchronous belt 314 to ensure the transmission of power; Furthermore, a limiting member is provided between the vertical plate 2 and the two connecting frames 313, and the limiting member is used to limit the position of the connecting frames 313 during the lifting process, so as to improve the stability of the connecting frames 313 during the lifting process; Furthermore, the limiting member includes a first guide rail 311 installed on the vertical plate 2, the outer surface of the first guide rail 311 is connected to a first slide seat 312, the first slide seat 312 is connected to the connecting frame 313, and the mutual cooperation between the first guide rail 311 and the first slide seat 312 realizes the limiting of the lifting process of the connecting frame 313, thereby improving the stability of the lifting process of the connecting frame 313.
[0029] When in use, taking the etching processing of the screen as an example, the screen is marked at B in the figure. The screen is placed vertically between the support frame 302 and the support rod 315 below, and then the driving motor 310 drives the two first synchronous belts 308 to rotate through the first synchronous wheel 307, the first synchronous belt 308 and the second synchronous belt 314, and then drives the upper support rod 315 to descend through the connecting frame 313, so that the top of the screen is located between the upper support frame 302 and the support rod 315, and the cylinder 317 drives the pad 304 to move through the connecting rod 316 and the threaded rod 303, so that the pad 304 and the support rod 315 cooperate to clamp and fix the screen.
[0030] Embodiment 3, further optimizes the laser etching equipment provided in Embodiment 1 or 2, specifically, as follows Figure 1 , Figure 2 , Figure 6-Figure 9 As shown, the laser engraving assembly 4 for laser etching includes a first linear module 401 installed on the front of the vertical plate 2, and the first linear module 401 is connected to the second linear module 402; a first mounting plate 405 is arranged on the second linear module 402, and a protective cover 404 is arranged on the front of the first mounting plate 405. The front of the first mounting plate 405 is also provided with a projection structure located in the protective cover 404, a detection structure and a laser etcher 414 respectively located on both sides of the projection structure; in modern manufacturing, laser etching technology is widely used in marking, pattern engraving and micro-processing of various materials due to its high precision, high efficiency and non-contact processing characteristics. In the field of processing, traditional laser etching equipment mostly relies on manual positioning or simple mechanical transmission systems to determine the processing path, which not only limits the processing accuracy, but also reduces production efficiency; in addition, the lack of real-time monitoring of the processing process often leads to unstable product quality, increased scrap rate and rework costs; the present application adopts a first linear module 401 and a second linear module 402 to be responsible for horizontal and vertical movement respectively, which significantly improves the flexibility of the processing path. The detection structure can monitor the workpiece status in real time during the processing process to ensure the processing quality, and the projection structure projects the processing path on the workpiece in advance to facilitate improving the processing accuracy.
[0031] Furthermore, a second guide rail 403 is installed on the front of the vertical plate 2, and a second slide is slidably connected to the outer surface of the second guide rail 403, and the second slide is connected to the second linear module 402. The second slide and the second guide rail 403 cooperate with each other to limit the horizontal movement process of the second linear module 402, so as to improve the stability of the second linear module 402 during horizontal movement.
[0032] Further, the projection structure includes a projection module 406 mounted on the front of the first mounting plate 405, the projection module 406 is connected to a projection lens 416, the projection lens 416 is connected to a projection focusing tube 411, the projection module 406 can project the processing path through the projection lens 416 and the projection focusing tube 411, and the projection focusing tube 411 can be extended to achieve focusing; Furthermore, a projection reflector 413 is installed on the front of the first mounting plate 405. The projection reflector 413 is located below the projection focusing cylinder 411. The laser etcher 414 is located on the side of the projection reflector 413. The projection reflector 413 is used to reflect the processing path projected by the projection module 406 onto the workpiece to display it on the workpiece. The mark at C in the figure is the projection indication of the processing path. Furthermore, an upper fixing plate 407 and a lower fixing plate 409 are fixedly sleeved on the projection focusing tube 411, and a connecting screw 408 is fixedly installed on the top of the lower fixing plate 409, and the top end of the connecting screw 408 passes through the upper fixing plate 407, and the connecting screw 408 can connect the lower fixing plate 409 and the upper fixing plate 407 together; Furthermore, a spring 410 is sleeved on the outer surface of the connecting screw 408, and the spring 410 is located between the upper fixing plate 407 and the lower fixing plate 409. The spring 410 can achieve a buffer between the upper fixing plate 407 when the lower fixing plate 409 drives the projection focusing cylinder 411 to extend and retract. Furthermore, a third linear module 415 is installed on the front of the first mounting plate 405, and the third linear module 415 is connected to the lower fixed plate 409. The third linear module 415 can drive the projection focusing tube 411 to extend and retract through the lower fixed plate 409 to achieve focusing. Furthermore, a third guide rail 412 is installed on the front side of the first mounting plate 405, and a third slide is slidably connected to the outer surface of the third guide rail 412, and the third slide is connected to the lower fixed plate 409. The cooperation between the third guide rail 412 and the third slide can achieve the limitation of the lower fixed plate 409, so as to improve the stability of the lower fixed plate 409 when it is lifted and lowered, and further improve the stability of the projection focusing tube 411 when it is extended and retracted.
[0033] Further, the detection structure includes a second mounting plate 417 fixedly mounted on the side of the first mounting plate 405, a fixing seat 418 is fixedly mounted on the front of the second mounting plate 417, a sliding seat 419 is slidably connected to the inner wall of the fixing seat 418, a fine-tuning scale 420 is connected between the sliding seat 419 and the fixing seat 418, a visual inspection camera 421 is mounted on the front of the sliding seat 419, and the fine-tuning scale 420 is a micrometer. By rotating the fine-tuning scale 420, the visual inspection camera 421 can be driven to move up and down to achieve fine-tuning of the visual inspection camera 421; A side panel 422 is installed at the bottom of the sliding seat 419, and a laser reflector 423 located below the visual inspection camera 421 is installed on the side panel 422. Light sources 424 are installed on both sides of the side panel 422. The laser reflector 423 is used to refract the image acquisition path of the visual inspection camera 421 so that the visual inspection camera 421 can obtain the processing status of the workpiece. The light source 424 is used for fill light. An opening is opened on the front of the protective cover 404, and the position of the opening corresponds to the position of the laser reflector 423, the projection reflector 413, the laser etcher 414 and the light source 424, thereby preventing the protective cover 404 from affecting the use of the laser reflector 423, the projection reflector 413, the laser etcher 414 and the light source 424.
[0034] When in use, taking the processing of the screen as an example, the screen is set vertically, the etched surface of the screen faces the protective cover 404, the projection module 406 projects the processing path to the projection mirror 413 through the projection lens 416 and the projection focusing tube 411, and the projection reflector 413 refracts the processing path to the screen, and the laser etcher 414 etches the screen along the processing path. During the etching process, the visual inspection camera 421 collects the etching conditions to realize detection.
[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0036] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.
Claims
1. Laser etching equipment, characterized in that, The invention comprises a base frame (1), a protective shell (5) is fixedly mounted on the top of the base frame (1), a vertical plate (2) located in the protective shell (5) is mounted on the top of the base frame (1), a clamping mechanism (3) for laser etching is arranged on the front of the vertical plate (2), the clamping mechanism (3) for laser etching is used to clamp the product to be etched, and a laser engraving assembly (4) for laser etching is also arranged on the front of the vertical plate (2), the laser engraving assembly (4) for laser etching is used to perform laser etching on the product.
2. The laser etching equipment according to claim 1, characterized in that: The clamping mechanism (3) for laser etching comprises a lifting structure and a mounting frame (301) mounted on the front of the vertical plate (2); the lifting structure and the mounting frame (301) are both connected to support rods (315); a plurality of clamping parts are provided on the sides of the two support rods (315) that are away from each other; the clamping parts cooperate with the support rods (315) to clamp and fix the product; The clamping portion comprises a support frame (302) fixedly mounted on a support rod (315), a cylinder (317) being arranged in the support frame (302), and a piston rod of the cylinder (317) passing through the support frame (302) and being connected to a clamping piece.
3. The laser etching equipment according to claim 2, characterized in that: The clamping member comprises a connecting rod (316) mounted on a piston rod of a cylinder (317), a threaded rod (303) being threadedly connected to the connecting rod (316), and a cushion block (304) being connected to one end of the threaded rod (303) close to the support rod (315).
4. The laser etching equipment according to claim 2 or 3, characterized in that: The lifting structure comprises two first support seats (305) and two second support seats (306) installed on the front of the vertical plate (2); the two first support seats (305) and the two second support seats (306) are each provided with a first synchronous wheel (307); and a first synchronous belt (308) is connected between every two first synchronous wheels (307); The two first synchronous belts (308) are both connected to a connecting frame (313), and the two connecting frames (313) are both connected to corresponding support rods (315).
5. The laser etching equipment according to claim 4, characterized in that: A drive motor (310) is mounted on the vertical plate (2), and an output shaft of the drive motor (310) is connected to one of the first synchronous wheels (307).
6. The laser etching device according to claim 5, characterized in that: The two first support seats (305) are both connected to a second synchronous wheel (309), the two second synchronous wheels (309) are respectively connected to two of the first synchronous wheels (307), and a second synchronous belt (314) is connected between the two second synchronous wheels (309).
7. The laser etching device according to claim 6, characterized in that: The laser engraving assembly (4) for laser etching comprises a first linear module (401) mounted on the front of a vertical plate (2), the first linear module (401) being connected to a second linear module (402); a first mounting plate (405) being arranged on the second linear module (402), a protective cover (404) being arranged on the front of the first mounting plate (405), and a projection structure located in the protective cover (404), a detection structure located on both sides of the projection structure, and a laser etcher (414) being arranged on the front of the first mounting plate (405).
8. The laser etching equipment according to claim 7, characterized in that: The projection structure comprises a projection module (406) mounted on the front of a first mounting plate (405); the projection module (406) is connected to a projection lens (416); and the projection lens (416) is connected to a projection focusing cylinder (411).
9. The laser etching device according to claim 8, characterized in that: A projection reflector (413) is installed on the front of the first mounting plate (405); the projection reflector (413) is located below the projection focusing cylinder (411); and the laser etcher (414) is located on the side of the projection reflector (413).
10. The laser etching device according to claim 9, characterized in that: The detection structure comprises a second mounting plate (417) fixedly mounted on a side of the first mounting plate (405); a fixing seat (418) is fixedly mounted on the front of the second mounting plate (417); a sliding seat (419) is slidably connected to the inner wall of the fixing seat (418); a fine-tuning scale (420) is connected between the sliding seat (419) and the fixing seat (418); and a visual detection camera (421) is mounted on the front of the sliding seat (419); A side plate (422) is installed at the bottom of the sliding seat (419), and a laser reflector (423) located below the visual inspection camera (421) is installed on the side plate (422).