Wide-light-spot intelligent laser cladding machine with rotary cutter

Abstract

The utility model belongs to the technical field of laser cladding, and particularly relates to a rotary cutter wide-light-spot intelligent laser cladding machine which comprises a base, a working platform, high-power wide-light-spot laser cladding equipment, a water cooling machine, a dust collector, a numerical control cabinet and a power machine, according to the utility model, the numerical control cabinet is matched with the working platform, the high-power wide-light-spot laser cladding equipment, the water cooling machine, the dust collector and the power machine in a numerical control manner, and the numerical control cabinet automatically controls the starting and operation of each equipment by one key, so that the early-stage preparation working time is greatly shortened. And the numerical control cabinet is connected with the working platform, the high-power wide-light-spot laser cladding equipment, the water cooling machine, the dust collector and the power machine for control, so that the processing data of the rotary cutter wide-light-spot intelligent laser cladding machine can be intelligently adjusted conveniently. The automatic and intelligent operation of the intelligent laser cladding machine with the wide light spots for the rotary cutter is realized, so that the intelligent laser cladding machine with the wide light spots for the rotary cutter can quickly enter an optimal working state when facing an emergency production task or needing to quickly adjust a production state.

Description

Technical Field

[0001] This utility model belongs to the field of laser cladding technology, specifically relating to a wide-spot intelligent laser cladding machine with a rotary cutting blade. Background Technology

[0002] With the development and progress of the national economy and the increasing market demand, the production and sales prospects of large flat cutting tools such as rotary cutting blades are quite promising. Compared with traditional cutting tools, laser cladding blades are in line with national industrial policies and industry development plans, and have broad sales space, good development prospects, and huge market potential in the domestic market.

[0003] Traditional rotary cutting tool manufacturing is mired in a dual dilemma of process and product performance. In terms of process, the heat treatment process for hot-rolled steel is complex, the high-temperature furnace operates for extended periods with high energy consumption, requires a large amount of cooling water, and generates significant pollution from exhaust emissions; the energy consumption for producing a single tool is staggering. Regarding product performance, traditional tools lack hardness, toughness, wear resistance, and impact resistance, resulting in rapid wear and short lifespans during processing. Frequent tool replacements increase costs and reduce efficiency. When dealing with complex working conditions or special woods, they are prone to chipping, deformation, and detachment, failing to meet diverse market demands. Consequently, laser cladding blades have emerged, using cladding units to process tools, enabling energy-saving, environmentally friendly, and stable production.

[0004] However, the cladding unit has many problems during startup. First, the operation procedures are cumbersome, and each piece of equipment needs to be started independently by the control system, which greatly prolongs the overall startup time of the cladding unit.

[0005] In today's production environment that demands high efficiency and rapid response, if cladding machines cannot achieve one-click automated and intelligent start-up, their competitive advantage in the market will be greatly weakened. When faced with urgent production tasks or the need to quickly adjust production status, cladding machines will be unable to quickly enter the optimal working state, thus exposing obvious shortcomings in terms of rapid response and efficient operation.

[0006] In summary, we provide a wide-spot intelligent laser cladding machine with a rotary cutting blade. Utility Model Content

[0007] The purpose of this utility model is to provide a wide-spot intelligent laser cladding machine with a rotary cutting blade. It aims to solve the problem that in today's production environment that pursues high efficiency and rapid response, if the cladding machine cannot achieve one-button automated and intelligent start-up, its competitive advantage in the market will be greatly weakened. When faced with urgent production tasks or when it is necessary to quickly adjust the production status, the cladding machine cannot quickly enter the optimal working state, thus exposing obvious shortcomings in terms of rapid response and efficient operation.

[0008] To achieve the above object, the present utility model provides the following technical solutions: A rotary cutting tool wide-spot intelligent laser cladding machine, comprising a base, a working platform, a high-power wide-spot laser cladding device, a water chiller, a dust collector, a numerical control cabinet, and a power machine. A laser generator and an air dryer are provided at the back end of the working platform. Dust-proof bellows cover fixing plates are installed at both ends of the working platform. The high-power wide-spot laser cladding device adopts a 60-mm wide-spot cladding component. Two slide rails are installed at the top end of the base. A toothed plate is installed at the top end of the base and located between the two slide rails. Sliders are installed at the bottom end of the working platform. A servo motor is installed in the inner cavity at the bottom end of the working platform. The output shaft of the servo motor is connected to a gear.

[0009] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, the working platform is slidably connected to the base through the slide rails and the sliders, and the dust-proof bellows cover fixing plates are fitted to the surfaces of the slide rails and the sliders.

[0010] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, the gear meshes with the toothed plate, and the working platform is gear-linked to the base through the gear and the toothed plate.

[0011] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, a baffle is provided at the front end of the working platform, and fixing blocks are installed on both sides of the front end face of the working platform.

[0012] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, a screw rod is installed inside the fixing block. A bearing is installed at one end of the screw rod. A first motor is installed at the other end of the screw rod, and the first motor is assembled at the end of the fixing block. A nut sleeve is threadedly connected to the surface of the screw rod. The outer side walls of the nut sleeve are connected to both ends of the baffle.

[0013] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, the baffle is threadedly lifted and lowered with the screw rod through the nut sleeve.

[0014] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, the screw rod is rotatably connected to the fixing block through the bearing and the first motor.

[0015] Preferably, for a rotary cutting tool wide-spot intelligent laser cladding machine of the present utility model, a support plate and a fixing plate are installed at the top end of the mounting seat of the numerical control cabinet. A guide rod is penetrated and sleeved on the surface of the support plate. A threaded rod is penetrated and threadedly connected to the surface of the fixing plate. A convex block is installed at the bottom end of the threaded rod. A rotation groove in the shape of a "convex" character is opened at the top end of the connection seat of the numerical control cabinet.

[0016] In a preferred embodiment of the wide-spot intelligent laser cladding machine with rotary cutting blade of this utility model, the CNC cabinet is connected to the mounting base by a threaded rod, and the protrusion is fitted into the interior of the rotating groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention involves fixing the rotary cutting blade to be clad on a work platform, then simultaneously starting the vacuum cleaner, power unit, water chiller, and high-power wide-spot laser cladding equipment by operating the CNC cabinet. During this process, the CNC cabinet automatically controls the start-up and operation of each device with a single button, significantly reducing preparation time. Simultaneously, the CNC cabinet connects and controls the work platform, high-power wide-spot laser cladding equipment, water chiller, vacuum cleaner, and power unit, facilitating intelligent adjustment of the processing data parameters of the rotary cutting blade wide-spot intelligent laser cladding machine. This achieves automated and intelligent operation of the rotary cutting blade wide-spot intelligent laser cladding machine, enabling it to quickly enter optimal working condition when facing urgent production tasks or requiring rapid adjustments to production status, thus greatly reducing any significant shortcomings in rapid response and efficient operation.

[0019] Next, the CNC cabinet utilizes the cooperation of threaded rods and guide rods to achieve flexible height adjustment, meeting the needs of workers of different heights and significantly improving operational convenience and comfort. Subsequently, the work platform moves from the base towards the high-power wide-spot laser cladding equipment. During this process, the dustproof bellows cover fixing plate, which is attached to the surface of the slide rail, and the servo motor drives the gears to rotate and mesh with the gear plate, effectively removes oxides from the slide rail surface as the slider moves along the slide rail. This avoids slide rail wear caused by oxides and the resulting gaps, thus ensuring the stability of the work platform, significantly improving the accuracy of the rotary cutter during the cladding process, and preventing platform wobbling. Then, the high-power wide-spot laser cladding equipment performs cladding processing on the long plate. During this process, the baffle connected to the front end of the work platform rises to block sparks generated during the cladding process, preventing workers from being burned by sparks flying from the front of the work platform and enhancing the safety of the working environment. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0022] Figure 2This is a schematic diagram of the disassembled structure of the base and working platform of this utility model.

[0023] Figure 3 A top-view schematic diagram showing the disassembled structure of the base and working platform of this utility model;

[0024] Figure 4 This is a schematic diagram of the baffle connection structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the CNC cabinet structure of this utility model;

[0026] Figure 6 This utility model Figure 5 A magnified structural diagram at point A in the diagram.

[0027] In the diagram: 1. Base; 2. Working platform; 3. Water chiller; 4. Vacuum cleaner; 5. Laser generator; 6. Power unit; 7. Air dryer; 8. CNC cabinet; 9. High-power wide-spot laser cladding equipment; 10. Slide rail; 11. Gear plate; 12. Slider; 13. Servo motor; 14. Gear; 15. Baffle; 16. Fixing block; 17. Lead screw; 18. Bearing; 19. First motor; 20. Sleeve; 21. Support plate; 22. Fixing plate; 23. Threaded rod; 24. Guide rod; 25. Rotating groove; 26. Protrusion; 27. Dustproof bellows cover fixing plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0029] Please see Figure 1-6 This utility model provides the following technical solution: a wide-spot intelligent laser cladding machine with a rotary cutting blade, comprising a base 1, a working platform 2, a high-power wide-spot laser cladding device 9, a water chiller 3, a dust collector 4, a CNC cabinet 8, and a power unit 6. A laser generator 5 and an air dryer 7 are installed at the back end of the working platform 2. Dustproof bellows cover fixing plates 27 are installed at both ends of the working platform 2. The high-power wide-spot laser cladding device adopts a 60mm wide-spot cladding component. Two slide rails 10 are installed at the top of the base 1. A toothed plate 11 is installed at the top of the base 1 and on the two slide rails 10. A slider 12 is installed at the bottom end of the working platform 2. A servo motor 13 is installed in the inner cavity at the bottom end of the working platform 2. The output shaft of the servo motor 13 is connected to a gear 14.

[0030] In a preferred embodiment: the work platform 2 is slidably connected to the base 1 via the slide rail 10 and the slider 12, and the dustproof bellows cover fixing plate 27 is attached to the surface of the slide rail 10 and the slider 12.

[0031] In a preferred embodiment: the gear 14 meshes with the toothed plate 11, and the working platform 2 is connected to the base 1 by the gear 14 and the toothed plate 11.

[0032] In this embodiment, the rotary cutting wide-spot intelligent laser cladding machine is composed of a base 1, a working platform 2, a high-power wide-spot laser cladding device 9, a water chiller 3, a dust collector 4, a CNC cabinet 8, a power unit 6, a laser generator 5, and an air dryer 7. The working platform 2 is connected to the bottom of the base 1, while the high-power wide-spot laser cladding device 9, the water chiller 3, the dust collector 4, the CNC cabinet 8, the power unit 6, the laser generator 5, and the air dryer 7 are installed on one side of the base 1 and the working platform 2.

[0033] The water chiller 3 is mainly used to cool the laser generator 5.

[0034] The main purpose of the vacuum cleaner is to remove smoke, impurities, sparks and other splashes generated during the cladding process, and to maintain a clean and hygienic working environment.

[0035] The power unit 6 is a device that converts various forms of energy into mechanical energy, providing a power source for other mechanical devices.

[0036] Laser generator 5 is a device that generates a laser beam. It generates a high-energy, highly directional, and highly monochromatic laser beam by exciting a medium (such as gas, solid, or liquid) to induce stimulated emission.

[0037] Air dryer 7 is used to remove moisture from the air and reduce the humidity of the air.

[0038] The air vent of the vacuum cleaner 4 is connected to the high-power wide-spot laser cladding equipment 9, which sucks away the smoke, impurities, sparks and other splashes generated during the cladding process.

[0039] Furthermore, when the working platform 2 moves on the base 1 close to the high-power wide-spot laser cladding equipment 9, the movement mechanism of the working platform 2 is as follows: After the servo motor 13 is started, it drives the gear 14 to rotate. The gear 14 meshes with the toothed plate 11 and moves forward, thereby driving the working platform 2 forward along the top of the base 1. At the same time, the working platform 2 also causes the slider 12 to move on the slide rail 10. As the working platform 2 moves, the dustproof bellows cover fixing plate 27 wipes the surface of the slide rail 10, effectively removing the oxide on it. This design prevents wear and gaps in the slide rail 10 caused by oxides, ensuring the stability of the working platform 2, significantly improving the accuracy of the rotary cutter in the cladding process, and avoiding the shaking of the working platform 2. Example 2

[0040] Please see Figure 1-6 The front end of the work platform 2 is provided with a baffle 15, and the two sides of the front end face of the work platform 2 are equipped with fixing blocks 16.

[0041] In a preferred embodiment: a lead screw 17 is installed inside the fixing block 16, a bearing 18 is installed at one end of the lead screw 17, a first motor 19 is installed at the other end of the lead screw 17, and the first motor 19 is assembled at the end of the fixing block 16. A threaded sleeve 20 is threadedly connected to the surface of the lead screw 17, and the outer wall of the threaded sleeve 20 is connected to both ends of the baffle 15.

[0042] In a preferred embodiment: the baffle 15 is connected to the lead screw 17 via the threaded sleeve 20 to form a threaded lifting connection.

[0043] In a preferred embodiment, the lead screw 17 is rotatably connected to the fixed block 16 via the bearing 18 and the first motor 19.

[0044] In this embodiment, as described in Embodiment 1, when the work platform 2 moves on the base 1 near the bottom of the high-power wide-spot laser cladding equipment 9 for processing, the necessary shielding can be provided by raising the baffle 15. The specific operation is as follows: The first motor 19 is started, and its output shaft drives the lead screw 17 to rotate within the inner ring of the bearing 18. Subsequently, the threaded sleeve 20 moves along the thread on the surface of the lead screw 17, and this movement in turn drives the movement of the baffle 15, causing the baffle 15 to rise and shield the front end of the work platform 2. The main purpose of this design is to prevent sparks from splashing during the cladding process, thereby avoiding the risk of burns to the skin from flying sparks when workers pass by the front end of the work platform 2, greatly enhancing the safety of the working environment.

[0045] It is worth noting that this shielding design only applies to the front of work platform 2, as staff typically only move around in this area. The back of work platform 2 houses important components such as the high-power, wide-spot laser cladding equipment 9, water chiller 3, vacuum cleaner 4, CNC cabinet 8, power unit 6, laser generator 5, and air dryer 7; therefore, staff will not walk through this area.

[0046] Furthermore, if it is necessary to shield the perimeter of the work platform 2, this can be achieved simply by installing a corresponding baffle 15 on the outer wall of the work platform 2. This design is both flexible and practical, and can be adjusted according to different processing requirements and working environments. Example 3

[0047] Please see Figure 1-6, a support plate 21 and a fixing plate 22 are installed at the top of the mounting seat of the numerical control cabinet 8. A guide rod 24 is sleeved through the surface of the support plate 21, and a threaded rod 23 is threadedly connected through the surface of the fixing plate 22.

[0048] Preferably in the embodiment: a convex block 26 is installed at the bottom end of the threaded rod 23, and a rotating groove 25 in the shape of a "convex" character is opened at the top end of the connecting seat of the numerical control cabinet 8.

[0049] Preferably in the embodiment: the numerical control cabinet 8 is connected in a lifting manner between the threaded rod 23 and the mounting seat, and the convex block 26 is adaptively assembled inside the rotating groove 25.

[0050] In the embodiment, according to what is described in Embodiment 1, when the numerical control cabinet 8 is started to adjust the height of the high-power wide-spot laser cladding device 9, by rotating the threaded rod 23, the convex block 26 can be driven to rotate in the rotating groove 25, so as to realize the rise or fall of the threaded rod 23 relative to the surface of the fixing plate 22. This movement process will synchronously drive the numerical control cabinet 8 to move up and down, thereby realizing the flexible adjustment of the height of the numerical control cabinet 8. Such a design significantly improves the convenience and comfort of operation, and meets the use requirements of workers with different heights.

[0051] In order to further enhance the stability of the height adjustment of the numerical control cabinet 8, a guide rod 24 and a support plate 21 are also designed as an auxiliary support structure. The guide rod 24 ensures the linear movement of the numerical control cabinet 8 during the height adjustment process and avoids the situation of shaking or deviation. Such a design makes the height adjustment of the numerical control cabinet 8 more stable and reliable, and provides a better use experience for workers.

[0052] In summary, according to what is described in Embodiments 1 to 3, the working principle of cladding is as follows: place the rotary cutting tool to be clad on the working platform and fix it, and then the worker operates the numerical control cabinet 8 while starting the high-power wide-spot laser cladding device 9, the water chiller 3, the dust collector 4 and the power machine 6 to move, and then the worker starts the laser generator 5 and the air dryer 7 to run. During this process, let the numerical control cabinet 8 automatically control the start and operation of each device with one key, which greatly reduces the pre-preparation time. At the same time, the connection control between the numerical control cabinet 8 and the high-power wide-spot laser cladding device 9, the water chiller 3, the dust collector 4 and the power machine 6 is convenient to intelligently adjust the processing data parameters of the rotary cutting tool wide-spot intelligent laser cladding machine through the numerical control cabinet 8. Furthermore, the automation and intelligence of the rotary cutting tool wide-spot intelligent laser cladding machine are realized, so that the rotary cutting tool wide-spot intelligent laser cladding machine can quickly enter the best working state when facing an urgent production task or needing to quickly adjust the production state, thus greatly reducing the obvious shortcomings in terms of rapid response and efficient operation. At the same time, when producing tools, it also has the characteristics of energy saving, environmental protection and stability.

[0053] Next, referring to Embodiment 3, the CNC cabinet 8 utilizes the cooperation of the threaded rod 23 and the guide rod 24 to achieve flexible adjustment of the height of the CNC cabinet 8, meeting the needs of workers of different heights and significantly improving the convenience and comfort of operation.

[0054] Subsequently, the wide-spot intelligent laser cladding machine with a rotary cutting blade is started using the CNC cabinet 8. The working platform 2 moves on the base 1, causing the rotary cutting blade to approach the bottom of the high-power wide-spot laser cladding equipment 9. The movement mechanism of the working platform 2 is as described in Embodiment 1. During this process, the dustproof bellows cover fixing plate 27, which is attached to the surface of the slide rail 10, and the servo motor 13 drives the gear 14 to rotate and mesh with the toothed plate 11, so that when the slider 12 moves along the slide rail 10, the dustproof bellows cover fixing plate 27 can effectively remove oxides from the surface of the slide rail 10. This avoids wear on the slide rail 10 caused by oxides and the resulting gaps, thereby ensuring the stability of the working platform 2, significantly improving the accuracy of the rotary cutting blade during the cladding process, and preventing the working platform 2 from shaking. Next, using a specialized, patented powder alloy material, the powder alloy material is loaded into a powder container connected to a high-power, wide-spot laser cladding equipment 9. The high-power, wide-spot laser cladding equipment 9 then performs cladding processing on the rotary cutting blade. The powder alloy material in the container is delivered to the blade body through a powder feeding pipe, and then the high-power, wide-spot laser cladding equipment 9 clad the powder alloy material onto the blade body, which serves as the cutting edge. This gives the rotary cutting blade, processed by the wide-spot intelligent laser cladding machine, higher hardness, toughness, and wear resistance. During production, pads are placed at the start and end positions of the sheet metal cladding on the work platform 2 to ensure sufficient metal powder supply to the cladding edges, a good molten pool shape, and sufficient cladding height. Subsequently, the worker observes the movement of the laser cladding molten pool, and prepares to end the process when it approaches the end point of the sheet metal. The end operation requires two workers to complete. One employee carefully observed the position of the molten pool, and when it left the sheet metal and continued to travel 2-3 cm on the height pad, immediately reported this to the cooperating personnel. Upon receiving the feedback, another employee immediately shut down the equipment and reset the laminating equipment.

[0055] Finally, referring to Embodiment 2, during the cladding process of the high-power wide-spot laser cladding equipment 9 with the rotary cutter, the baffle 15 connected to the front end of the work platform 2 is raised to block the sparks generated during the cladding process, thus avoiding the risk of workers being burned by the sparks flying from the front end of the work platform 2 and enhancing the safety of the working environment.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wide-spot intelligent laser cladding machine with a rotary cutting blade, characterized in that: It includes a base (1), a working platform (2), a high-power wide-spot laser cladding device (9), a water chiller (3), a dust collector (4), a numerical control cabinet (8), and a power machine (6). A laser generator (5) and an air dryer (7) are provided at the back end of the working platform (2). Fixed plates (27) for dust-proof bellows are installed at both ends of the working platform (2). The high-power wide-spot laser cladding device (9) adopts a 60-mm wide-spot cladding component; Two slide rails (10) are installed at the top of the base (1). A toothed plate (11) is installed at the top of the base (1) and located between the two slide rails (10). Sliders (12) are installed at the bottom end of the working platform (2). A servo motor (13) is installed in the inner cavity at the bottom end of the working platform (2). The output shaft of the servo motor (13) is connected to a gear (14).

2. The wide-spot intelligent laser cladding machine with rotary cutting blade according to claim 1, characterized in that: The working platform (2) is slidably connected to the base (1) through the slide rails (10) and the sliders (12). The fixed plates (27) for dust-proof bellows are fitted to the surfaces of the slide rails (10) and the sliders (12).

3. The wide-spot intelligent laser cladding machine with rotary cutting blade according to claim 1, characterized in that: The gear (14) meshes with the toothed plate (11). The working platform (2) is gear-linked to the base (1) through the gear (14) and the toothed plate (11).

4. The wide-spot intelligent laser cladding machine with rotary cutting blade according to claim 1, characterized in that: A baffle (15) is provided at the front end of the working platform (2). Fixed blocks (16) are installed on both sides of the front surface of the working platform (2).

5. The intelligent laser cladding machine with wide light spot and rotary cutting tool according to claim 4, characterized in that: A screw rod (17) is installed inside the fixed block (16). A bearing (18) is installed at one end of the screw rod (17). A first motor (19) is installed at the other end of the screw rod (17), and the first motor (19) is assembled at the end of the fixed block (16). A thread sleeve (20) is threadedly connected to the surface of the screw rod (17). The outer side walls of the thread sleeve (20) are connected to both ends of the baffle (15).

6. The wide-spot intelligent laser cladding machine with rotary cutting blade according to claim 4, characterized in that: The baffle (15) is threadedly lifted and lowered with the screw rod (17) through the thread sleeve (20).

7. The intelligent laser cladding machine with wide light spot and rotary cutting tool according to claim 5, characterized in that: The screw rod (17) is rotatably connected to the fixed block (16) through the bearing (18) and the first motor (19).

8. The wide-spot intelligent laser cladding machine with rotary cutting blade according to claim 1, characterized in that: A support plate (21) and a fixing plate (22) are installed at the top of the mounting seat of the numerical control cabinet (8). A guide rod (24) is penetrated and sleeved on the surface of the support plate (21). A threaded rod (23) is penetrated and threadedly connected to the surface of the fixing plate (22).

9. The wide-spot intelligent laser cladding machine with rotary cutting blade according to claim 8, characterized in that: A convex block (26) is installed at the bottom end of the threaded rod (23). A rotation groove (25) in the shape of a "convex" character is formed at the top of the connecting seat of the numerical control cabinet (8).

10. The intelligent laser cladding machine with wide light spot and rotary cutting tool according to claim 9, characterized in that: The numerical control cabinet (8) is lifted and lowered with the mounting seat through the threaded rod (23). The convex block (26) is fitted and assembled inside the rotation groove (25).

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