Laser processing dust removal device and dust removal method

Abstract

This invention discloses a dust removal device and method for laser processing, including a workpiece holder for placing workpieces and a dust removal mechanism. The dust removal mechanism includes a fixed cover and an extraction cover, which are slidably connected. The fixed cover is equipped with a lifting drive device for driving the extraction cover to move up and down, thereby driving the extraction cover to move between an upper and lower position. An annular cavity is provided inside the extraction cover, with an extraction port on the inner side and an extraction pipe on the outer side. Both the extraction port and the extraction pipe are connected to the annular cavity. When the dust removal device is in operation, the extraction cover is in the lower position, and the workpiece on the workpiece holder is located inside the extraction cover, forming an annular extraction channel between the inner side of the extraction cover and the outer side of the workpiece holder. The extraction port is located below the workpiece. During processing, the workpiece is protected by the extraction cover, preventing the dust generated during processing from spreading into the surrounding environment and posing no harm to the surrounding environment or workers.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and in particular to a dust removal device and a dust removal method for laser processing. Background Art

[0002] During laser processing (such as laser marking, laser cutting, etc.), smoke and dust are generated. The smoke and dust will be released into the surrounding environment, causing certain harm to the surrounding environment and nearby workers. In order to absorb the smoke and dust generated during laser processing, the traditional practice is to arrange a smoke and dust removal device on one side of the processing area. The smoke and dust removal device sucks in the smoke and dust through negative pressure. For example, the utility model patent with publication number CN210995734U and invention name is a smoke and dust removal device for a laser marking machine. This patent is to set a suction hood on one side of the processing area. The suction hood is connected to the exhaust fan through a hose. The exhaust fan is used to extract the smoke and dust to achieve the smoke and dust removal effect.

[0003] However, the existing smoking dust removal method can only absorb smoke and dust from one side, and the smoking dust removal method is not ideal. It is unable to thoroughly absorb the smoke and dust generated during the processing. During the processing, a large amount of smoke and dust will still spread into the surrounding environment, which will still cause great harm to the surrounding environment and workers. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art and to provide a dust removal device and a dust removal method for laser processing.

[0005] The object of the present invention is achieved through the following technical solution: a dust removal device for laser processing, comprising a workpiece seat for placing a workpiece, a dust removal mechanism, the dust removal mechanism comprising a fixed cover and an exhaust hood, the exhaust hood being slidably connected to the fixed cover, the fixed cover being provided with a lifting drive device for driving the exhaust hood to move up and down, the exhaust hood being driven by the lifting drive device to move between an upper end position and a lower end position;

[0006] An annular cavity is provided in the exhaust hood, an exhaust port is provided on the inner side of the exhaust hood, an exhaust pipe is provided on the outer side of the exhaust hood, and both the exhaust port and the exhaust pipe are connected to the annular cavity; the exhaust pipe is connected to the exhaust device;

[0007] When the dust removal device is in working state, the exhaust hood is located at the lower end position, the workpiece on the workpiece seat is located in the exhaust hood, and an annular exhaust channel is formed between the inner side of the exhaust hood and the outer side of the workpiece seat; the exhaust port is located below the workpiece.

[0008] Preferably, the lifting drive device is a cylinder, the cylinder body of the cylinder is fixedly connected to the upper end of the fixed cover, and the lower end of the piston rod on the cylinder is connected to the upper end of the exhaust hood.

[0009] Preferably, the workpiece seat consists of two parts: a cylinder and a frustum, and the frustum is arranged at the upper end of the cylinder.

[0010] Preferably, a closing adjustment mechanism is provided at the lower end of the exhaust hood; when the dust removal device is in operation, the lower end of the annular exhaust passage is closed by the closing adjustment mechanism.

[0011] Preferably, the closed adjustment mechanism comprises a control ring rotatably connected to the outside of the exhaust hood, and a motor for driving the control ring to rotate is provided on the outside of the exhaust hood;

[0012] The control ring includes a ring body, and a plurality of protrusions are evenly arranged on the outer side of the ring body. The protrusions are provided with wave crests, and wave troughs are formed between two adjacent protrusions.

[0013] The lower end of the exhaust hood is evenly provided with a plurality of guide holes along the circumferential direction, and the guide holes are arranged along the radial direction of the exhaust hood. A movable rod is slidably connected to the guide hole, and the movable rod corresponds to the protrusion on the control ring one by one; one end of the movable rod is located outside the exhaust hood and is provided with a roller, and the roller is in contact with the outer side of the control ring; the other end of the movable rod is located inside the exhaust hood and is provided with a hook body; a flexible membrane is provided on the inner side of the lower end of the exhaust hood, and the flexible membrane is annular, and the outer edge of the flexible membrane is fixedly connected to the inner wall of the exhaust hood, and the inner edge of the flexible membrane is provided with an elastic shrinkage ring; the elastic shrinkage ring is also connected to the hook body on the movable rod; when the dust removal device is in working condition, the roller on the movable rod stays at the trough position outside the control ring.

[0014] Preferably, an annular groove corresponding to the control ring is provided on the outer side of the exhaust hood, the control ring is arranged in the annular groove, and a low-resistance ring is provided between the control ring and the annular groove.

[0015] Preferably, the low-resistance ring is made of polyethylene.

[0016] Preferably, a gear ring is provided on the ring body, and a gear is connected to the motor, and the gear is meshed with the gear ring.

[0017] Preferably, the workpiece seat is arranged on a movable base, and the movable base is arranged on an assembly line device.

[0018] A dust removal method for laser processing, the specific method is as follows:

[0019] Before laser processing the workpiece, the exhaust hood is located at the upper end position and the control ring is located at the first angle position. At this time, the roller on the movable rod is located at the peak position outside the control ring, so that the opening area inside the flexible ring reaches the maximum;

[0020] When laser processing is performed on a workpiece, the workpiece seat is located directly below the exhaust hood, the laser head is located above the workpiece, and the exhaust hood is driven downward to the lower end position by the lifting drive device. At this time, the exhaust port inside the exhaust hood is lower than the workpiece; then the motor drives the control ring to rotate and make the control ring reach the second angle position, and the roller on the movable rod moves from the peak position outside the control ring to the trough position. During this process, the movable rod moves toward the inside of the exhaust hood under the action of the elastic shrink ring so that the inner side of the flexible membrane is connected to the side of the workpiece seat, so that the lower end of the annular exhaust channel is in a closed state; the exhaust device is turned on, and the air flow in the exhaust hood flows downward and enters the exhaust port;

[0021] After the laser processing of the workpiece is completed, the exhaust device is closed, the control ring is first rotated to the first angle state, and then the exhaust hood moves up to the upper end position.

[0022] The beneficial effects of the present invention are:

[0023] 1. When the workpiece is being processed, it is enclosed by an exhaust hood, so the smoke and dust generated by the processing will not spread to the surrounding environment and will not cause harm to the surrounding environment and workers.

[0024] 2. The exhaust port is located below the workpiece. Under the constraints of the exhaust hood and the fixed hood, a dust removal airflow flowing from top to bottom can be formed in the exhaust hood, so that the smoke and dust generated during the processing can flow downward and be sucked away by the exhaust port below. The smoke and dust removal effect is good, the dust removal efficiency is high, and the smoke and dust generated during the processing can be sucked away more thoroughly.

[0025] 3. During traditional laser processing, the smoke generated during processing will flow and diffuse upward, which will easily form a smoke zone above the workpiece. The smoke zone will affect the laser beam, and the smoke particles can absorb or scatter the laser energy, resulting in a reduction in the energy reaching the workpiece surface, thereby reducing the processing efficiency and quality. In the present invention, since the dust removal airflow flows downward in the exhaust hood, it will drive the smoke generated during the processing to flow downward, which can prevent the smoke from flowing and diffusing upward, and further avoid the formation of a smoke zone above the workpiece, thereby improving the laser processing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 This is a structural diagram of one direction of the dust removal mechanism.

[0028] Figure 3 It is a structural diagram of the dust removal mechanism in another direction.

[0029] Figure 4 for Figure 3 Enlarged view of part A in the middle.

[0030] Figure 5 This is a structural diagram of the control loop.

[0031] Figure 6 It is a cross-sectional view of the dust removal mechanism.

[0032] Figure 7 for Figure 6 Enlarged view of part B in the middle.

[0033] Figure 8 for Figure 7 Enlarged view of part D in the middle.

[0034] Figure 9 This is a schematic diagram of the dust removal mechanism when removing smoke and dust.

[0035] Figure 10 for Figure 9 Enlarged view of middle part E.

[0036] In the figure: 1. Assembly line device, 2. Moving base, 3. Workpiece base, 4. Workpiece, 5. Fixed cover, 6. Exhaust hood, 6a. Exhaust port, 6b. Annular cavity, 7. Lifting drive device, 8. Laser head, 9. Support base, 10. Exhaust pipe, 11. Control ring, 11a. Ring body, 11b. Protrusion, 11c. Gear ring, 12. Movable rod, 12a. Hook body, 13. Roller, 14. Motor, 15. Gear, 16. Elastic shrink ring, 17. Flexible membrane, 18. Low-resistance ring. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0038] It should be understood by those skilled in the art that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0039] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0040] like Figures 1 to 10 As shown, a dust removal device for laser processing includes a workpiece seat 3 for placing a workpiece 4, a dust removal mechanism, the dust removal mechanism includes a fixed cover 5 and an exhaust hood 6, the exhaust hood 6 is slidably connected to the fixed cover 5, and the fixed cover 5 is provided with a lifting drive device 7 for driving the exhaust hood 6 to move up and down, and the exhaust hood 6 is driven to move between the upper end position and the lower end position by the lifting drive device 7; an annular cavity 6b is provided in the exhaust hood 6, an exhaust port 6a is provided on the inner side of the exhaust hood 6, and an exhaust pipe 10 is provided on the outer side of the exhaust hood 6, the exhaust port 6a and the exhaust pipe 10 are both connected to the annular cavity 6b; the exhaust pipe 10 is connected to the exhaust device.

[0041] When the dust removal device is in working state, the exhaust hood 6 is located at the lower end position, the workpiece 4 on the workpiece seat 3 is located in the exhaust hood 6, and an annular exhaust channel is formed between the inner side of the exhaust hood 6 and the outer side of the workpiece seat 3; the exhaust port 6a is located below the workpiece 4.

[0042] In the present invention, the up and down movement of the exhaust hood 6 can be achieved through the lifting drive device 7. When the exhaust hood 6 is in the upper end position, the lower end of the exhaust hood 6 is higher than the workpiece seat 3. At this time, the workpiece seat 3 can move under the dust removal mechanism, which is suitable for assembly line production; when the workpiece 4 is undergoing laser processing, the laser head 8 is located above the workpiece 4, and the exhaust hood 6 moves to the lower end position, so that the workpiece 4 is located in the exhaust hood 6, the exhaust device is turned on and negative pressure is generated, at this time, the exhaust hood 6 will flow from top to bottom into the annular exhaust channel and be sucked into the exhaust port 6a, forming a downward-flowing dust removal airflow in the exhaust hood 6 and the fixed hood 5. At this time, the smoke and dust generated during the laser processing will also flow downward with the dust removal airflow and be sucked into the exhaust port 6a, thereby achieving the effect of removing smoke and dust.

[0043] The smoke and dust removal method of the present invention has the following advantages: first, when the workpiece 4 is being processed, the smoke and dust generated by the processing will not spread to the surrounding environment, and will not cause harm to the surrounding environment and workers; second, the exhaust port 6a is located below the workpiece 4. Under the constraints of the exhaust hood 6 and the fixed cover 5, a dust removal airflow flowing from top to bottom can be formed in the exhaust hood 6, so that the smoke and dust generated during the processing can flow downward and be sucked away by the exhaust port 6a below, which has a good smoke and dust removal effect and high dust removal efficiency, and can more thoroughly remove the smoke and dust generated during the processing. Smoke and dust; third, in the traditional laser processing process, the smoke and dust generated by the processing will flow and diffuse upward, which will easily form a smoke and dust area above the workpiece 4. The smoke and dust area will affect the laser beam, and the smoke and dust particles can absorb or scatter the laser energy, resulting in a reduction in the energy reaching the surface of the workpiece 4, thereby reducing the processing efficiency and quality; in the present invention, since the dust removal airflow flows downward in the exhaust hood 6, it will drive the smoke and dust generated in the processing process to flow downward, which can avoid the smoke and dust from flowing and diffusing upward, and then avoid the formation of a smoke and dust area above the workpiece 4, thereby improving the laser processing efficiency and quality.

[0044] The exhaust hood 6 is sleeved on the outside of the fixed hood 5 and can move up and down along the fixed hood 5. The fixed hood 5 is mounted on a support base 9, which is mounted on the equipment base. The fixed hood 5 is kept in a fixed position by the support base 9. The exhaust device is an exhaust fan.

[0045] In this embodiment, the lifting drive 7 is a pneumatic cylinder. The cylinder body is fixedly connected to the upper end of the fixed cover 5, and the lower end of the piston rod of the cylinder is connected to the upper end of the exhaust cover 6. A pneumatic cylinder is provided on each side of the fixed cover 5, and the two cylinders work together to drive the up and down movement of the exhaust cover 6. The lifting drive 7 can also be an electric cylinder or a hydraulic cylinder.

[0046] The workpiece seat 3 is composed of a cylindrical body and a frustum body, and the frustum body is arranged at the upper end of the cylindrical body.

[0047] Furthermore, a closing adjustment mechanism is provided at the lower end of the exhaust hood 6; when the dust removal device is in operation, the lower end of the annular exhaust passage is closed by the closing adjustment mechanism.

[0048] In the present invention, when the dust removal device is in operation, the lower end of the annular exhaust channel is sealed and brought into a closed state by a closed adjustment mechanism. This has the following advantages: 1. It can prevent smoke and dust from leaking outward from the lower end of the annular exhaust channel, ensuring that all smoke and dust generated during the processing process can be sucked away by the exhaust port 6a, thereby improving the efficiency of smoke removal and dust removal. 2. By sealing the lower end of the annular exhaust channel, when the exhaust port 6a is exhausting, outside air can only enter from the upper end of the exhaust hood 6, so that the dust removal airflow is concentrated and flows downward from the top of the exhaust hood 6, which can increase the flow rate of the dust removal airflow. The increase in the dust removal airflow can improve the inhibitory effect on the upward flow and diffusion of smoke and dust, effectively reducing the impact of smoke and dust on the laser beam.

[0049] Furthermore, the closed adjustment mechanism includes a control ring 11 rotatably connected to the outside of the exhaust hood 6, and a motor 14 is provided on the outside of the exhaust hood 6 for driving the control ring 11 to rotate; the control ring 11 includes a ring body 11a, and a plurality of protrusions 11b are evenly provided on the outside of the ring body 11a, and a wave crest position is provided on the protrusion 11b, and a wave trough position is formed between two adjacent protrusions 11b; the lower end of the exhaust hood 6 is evenly provided with a plurality of guide holes along the circumferential direction, and the guide holes are arranged along the radial direction of the exhaust hood 6, and a movable rod 12 is slidably connected in the guide hole, and the movable rod 12 corresponds one-to-one with the protrusion 11b on the control ring 11. One end of the movable rod 12 is located outside the exhaust hood 6 and is equipped with a roller 13, which contacts the outer side of the control ring 11. The other end of the movable rod 12 is located inside the exhaust hood 6 and is equipped with a hook 12a. A flexible membrane 17 is provided on the inner side of the lower end of the exhaust hood 6. The outer edge of the flexible membrane 17 is fixedly connected to the inner wall of the exhaust hood 6, and the inner edge of the flexible membrane 17 is provided with an elastic shrink ring 16. The elastic shrink ring 16 is also connected to the hook 12a on the movable rod 12. When the dust removal device is in operation, the roller 13 on the movable rod 12 stays in the valley outside the control ring 11.

[0050] The elastic shrink ring 16 is made of an elastic material and has an inward contracting force. The motor 14 drives the control ring 11 to rotate, thereby adjusting the opening area inside the flexible membrane 17. When the motor 14 drives the control ring 11 to rotate to a first angle, the roller 13 on the movable rod 12 contacts the peak outside the control outer side, and the movable rod 12 extends to the maximum distance outside the exhaust hood 6. The movable rod 12 stretches the elastic shrink ring 16 to its maximum state, and the opening distance inside the flexible membrane 17 reaches its maximum. When the motor 14 drives the control ring 11 to rotate to a second angle, the roller 13 on the movable rod 12 contacts the trough outside the control outer side, and the movable rod 12 extends to the minimum distance outside the exhaust hood 6, and the opening distance inside the flexible membrane 17 reaches its minimum. The rotation of the control ring 11 can achieve the adjustment of the opening area inside the flexible ring. When the dust removal device is in operation, the control ring 11 is in the second angular position. The opening area inside the flexible membrane 17 is minimized, and the inner side of the flexible membrane 17, under the action of the elastic shrink ring 16, contacts the side of the workpiece seat 3, sealing the lower end of the air extraction channel through the flexible membrane 17. Before the exhaust hood 6 moves from the lower end position to the upper end position, the control ring 11 first rotates to the second angular position to maximize the opening area inside the flexible membrane 17, thereby disengaging the inner side of the flexible membrane 17 from contact with the side of the workpiece seat 3, facilitating the upward movement of the exhaust hood 6 and its separation from the workpiece seat 3. Since the opening area inside the flexible membrane 17 is adjustable, the sealing adjustment mechanism can adapt to workpieces 4 of different diameters.

[0051] The outside of the exhaust hood 6 is provided with an annular groove corresponding to the control ring 11. The control ring 11 is positioned within the annular groove, with a low-resistance ring 18 positioned between the control ring 11 and the annular groove. Low-resistance ring 18 is made of polyethylene. By placing low-resistance ring 18 between the control ring 11 and the annular groove, it reduces the resistance of the control ring 11 during rotation.

[0052] Ring body 11a is provided with a ring gear 11c, and motor 14 is connected to a gear 15, which meshes with ring gear 11c. Motor 14 is fixedly connected to the outside of exhaust hood 6, and motor 14 drives gear 15 to rotate, which in turn drives control ring 11 to rotate through the engagement between gear 15 and ring gear 11c.

[0053] The workpiece base 3 is mounted on the movable base 2, which is mounted on the assembly line device 1. The movable base 2 can move on the assembly line device 1. After the workpiece 4 completes the current laser processing, the exhaust hood 6 moves to the upper end position, and the movable base moves on the assembly line device 1 and moves to the next workstation.

[0054] A dust removal method for laser processing, the specific method is as follows:

[0055] Before laser processing the workpiece 4, the exhaust hood 6 is located at the upper end position, and the control ring 11 is located at the first angle position. At this time, the roller 13 on the movable rod 12 is located at the peak position outside the control ring 11, so that the opening area inside the flexible ring reaches the maximum;

[0056] When the workpiece 4 is laser processed, the workpiece seat 3 is located directly below the exhaust hood 6, and the laser head 8 is located above the workpiece 4. The exhaust hood 6 is driven downward to the lower end position by the lifting drive device 7. At this time, the exhaust port 6a inside the exhaust hood 6 is lower than the workpiece 4; then the motor 14 drives the control ring 11 to rotate and makes the control ring 11 reach the second angle position, and the roller 13 on the movable rod 12 moves from the peak position outside the control ring 11 to the trough position. During this process, the movable rod 12 moves toward the inside of the exhaust hood 6 under the action of the elastic shrink ring 16 so that the inner side of the flexible membrane 17 is connected to the side of the workpiece seat 3, so that the lower end of the annular exhaust channel is in a closed state; the exhaust device is turned on, and the air flow in the exhaust hood 6 flows downward and enters the exhaust port 6a;

[0057] After the laser processing of the workpiece 4 is completed, the exhaust device is closed, the control ring 11 is first rotated to the first angle state, and then the exhaust hood 6 moves up to the upper end position.

[0058] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A dust removal device for laser processing, characterized in that: It includes a workpiece seat for placing workpieces and a dust removal mechanism. The dust removal mechanism includes a fixed cover and an exhaust cover. The exhaust cover is slidably connected to the fixed cover. A lifting drive device for driving the exhaust cover to move up and down is provided on the fixed cover. The exhaust cover is driven to move between an upper end position and a lower end position by the lifting drive device. An annular cavity is arranged in the exhaust hood, an exhaust port is arranged on the inner side of the exhaust hood, an exhaust pipe is arranged on the outer side of the exhaust hood, and both the exhaust port and the exhaust pipe are connected to the annular cavity; the exhaust pipe is connected to the exhaust device; When the dust removal device is in working state, the exhaust hood is located at the lower end position, the workpiece on the workpiece seat is located in the exhaust hood, and an annular exhaust passage is formed between the inner side of the exhaust hood and the outer side of the workpiece seat; the exhaust port is located below the workpiece; The lower end of the exhaust hood is provided with a closed adjustment mechanism; when the dust removal device is in working state, the lower end of the annular exhaust passage is closed by the closed adjustment mechanism; The closed adjustment mechanism comprises a control ring rotatably connected to the outside of the exhaust hood, and a motor for driving the control ring to rotate is provided on the outside of the exhaust hood; the control ring comprises a ring body, and a plurality of protrusions are evenly arranged on the outside of the ring body, and a wave crest is arranged on the protrusion, and a wave trough is formed between two adjacent protrusions; a plurality of guide holes are evenly arranged along the circumferential direction at the lower end of the exhaust hood, and the guide holes are arranged along the radial direction of the exhaust hood, and a movable rod is slidably connected in the guide hole, and the movable rod corresponds to the protrusion on the control ring one by one; one end of the movable rod is located outside the exhaust hood and is provided with a roller, and the roller contacts the outside of the control ring; the other end of the movable rod is located inside the exhaust hood and is provided with a hook body; a flexible membrane is provided on the inner side of the lower end of the exhaust hood, and the flexible membrane is annular, and the outer edge of the flexible membrane is fixedly connected to the inner wall of the exhaust hood, and the inner edge of the flexible membrane is provided with an elastic shrink ring; the elastic shrink ring is also connected to the hook body on the movable rod; when the dust removal device is in a working state, the roller on the movable rod stays at the wave trough outside the control ring; The workpiece seat is arranged on a mobile base, and the mobile base is arranged on an assembly line device; The dust removal method of the dust removal device for laser processing is as follows: Before laser processing of the workpiece, the exhaust hood is located at the upper end position, and the control ring is located at the first angle position. At this time, the roller on the movable rod is located at the wave crest position outside the control ring, so that the opening area inside the flexible ring reaches the maximum; When laser processing is performed on the workpiece, the workpiece seat is located directly below the exhaust hood, the laser head is located above the workpiece, and the exhaust hood is driven to move down to the lower end position by the lifting drive device. At this time, the exhaust port on the inner side of the exhaust hood is lower than the workpiece; then the motor drives the control ring to rotate and make the control ring reach the second angle position, and the roller on the movable rod moves from the wave crest position on the outer side of the control ring to the wave trough position. During this process, the movable rod moves toward the inner side of the exhaust hood under the action of the elastic shrink ring so that the inner side of the flexible membrane is connected to the side of the workpiece seat, so that the lower end of the annular exhaust channel is in a closed state; the exhaust device is turned on, and the airflow in the exhaust hood flows downward and enters the exhaust port; After the laser processing of the workpiece is completed, the exhaust device is closed, the control ring is first rotated to the first angle state, and then the exhaust hood moves up to the upper end position.

2. A dust removal device for laser processing according to claim 1, characterized in that: The lifting drive device is a cylinder, the cylinder body of the cylinder is fixedly connected to the upper end of the fixed cover, and the lower end of the piston rod on the cylinder is connected to the upper end of the exhaust cover.

3. The dust removal device for laser processing according to claim 1, characterized in that: The workpiece seat is composed of two parts: a cylinder and a truncated cone, and the truncated cone is arranged at the upper end of the cylinder.

4. The dust removal device for laser processing according to claim 1, characterized in that: An annular groove corresponding to the control ring is arranged on the outer side of the exhaust hood, the control ring is arranged in the annular groove, and a low-resistance ring is arranged between the control ring and the annular groove.

5. A dust removal device for laser processing according to claim 4, characterized in that: The low-resistance ring is made of polyethylene.

6. The dust removal device for laser processing according to claim 1, characterized in that: The ring body is provided with a gear ring, the motor is connected with a gear, and the gear is meshed with the gear ring.

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