Automatic laser cutting equipment and method

Abstract

The invention relates to the technical field of laser cutting, and discloses automatic laser cutting equipment and method.The automatic laser cutting equipment comprises a laser cutting machine tool, and the tail end of a laser cutting head of the laser cutting machine tool is sleeved with a cutting point cleaning assisting mechanism which is used for conducting scar removing and burr grinding treatment on the edge of a cut gap; the cutting point cleaning assisting mechanism comprises a pressing ring body, a scar cleaning assembly and a transmission assembly, the pressing ring body is of an annular structure, the inner ring diameter of the pressing ring body is larger than the outer diameter of the laser cutting head, and the pressing ring body and the laser cutting head are concentrically arranged; two mutually parallel scar cleaning assemblies are rotationally mounted on the lower wall of the pressing ring body, the distance between the two scar cleaning assemblies is 5-10 mm larger than the diameter of a cutting laser beam, and each scar cleaning assembly comprises a ring grinding belt and two limiting discs; the cutting point cleaning assisting mechanism is arranged outside the tail end of the laser cutting head in a sleeving mode, so that scar removing and burr polishing treatment and the laser cutting process are synchronously carried out.

Description

Technical Field

[0001] This invention relates to the field of laser cutting, and more specifically, to an automated laser cutting device and method. Background Technology

[0002] Laser cutting technology, as a highly efficient and precise processing method, has been widely used in modern industrial production. However, during the laser cutting process, due to the influence of various factors such as material properties, cutting parameters, and thermal effects, some undesirable phenomena often occur on the edges of the cut workpiece.

[0003] During the cutting process, molten metal material may not be completely blown away from the cutting kerf. After cooling, it adheres to the cutting edge, forming irregular protrusions or particles, which affect the surface quality of the workpiece and subsequent processing. To address this, we propose an automated laser cutting device and method. Summary of the Invention

[0004] This invention provides an automated laser cutting device and method, which solves the technical problem in related technologies where molten metal material fails to be completely blown away from the cutting kerf during the cutting process, and adheres to the cutting edge after cooling, forming irregular protrusions or particles, which affects the surface quality of the workpiece and subsequent processing.

[0005] The first aspect of the present invention provides an automated laser cutting device, comprising: a laser cutting machine tool, wherein a cutting point cleaning mechanism is sleeved on the outer side of the laser cutting head of the laser cutting machine tool for removing scars and polishing burrs on the edge of the cut seam; The cutting point cleaning mechanism includes a pressure ring body, a scar removal component, and a transmission component. The pressure ring body has a circular ring structure, and the inner ring diameter of the pressure ring body is larger than the outer diameter of the laser cutting head, and the two are set at the same center. Two parallel scar removal components are rotatably mounted on the lower wall of the pressure ring body. The distance between the two scar removal components is greater than 5-10 mm of the diameter of the cutting laser beam. Each scar removal component includes a ring grinding belt and two limiting discs. The ring grinding belt passes through the two limiting discs that are rotatably connected to the pressure ring body and is in a tensioned state. The outer wall surface of each ring grinding belt is embedded with an alloy ribbon. The transmission component is connected to the limit plate drive to drive the two scar removal components to rotate in a circle around the laser cutting point as the rotation center, while keeping the laser irradiation point from being contacted. At the same time, it drives the two ring grinding belts to rotate tightly against the surface of the cut plate. Through the friction between the alloy belt and the surface of the cut plate, the edge of the gap formed after cutting is cleaned of scars and burrs is polished.

[0006] Furthermore, two electric telescopic rods are fixedly installed on the upper wall of the pressure ring body. The top ends of the two electric telescopic rods are fixed to the laser cutting head of the laser cutting machine. Both electric telescopic rods are controlled by the system, which controls the electric telescopic rods to drive the pressure ring body to move up and down, pressing it tightly against the periphery of the cutting point, reducing the deformation of the cutting point caused by the heat generated by laser cutting.

[0007] Furthermore, the lower wall of the pressure ring body is provided with an annular groove, two annular grinding belts are located in the annular groove, and an induction heating wire is provided around the rotation range of the annular grinding belt in the annular groove. The induction heating wire is controlled by the system to preheat and slow down the temperature around the cutting point.

[0008] Furthermore, an annular groove is also provided in the annular groove, the limiting plate slides and rotates along the annular groove, and a belt-passing block is fixedly provided on the upper wall of the limiting plate. The belt-passing block passes through the annular groove and is located inside the pressure ring body. Each end of the annular grinding belt corresponds to a belt-passing block.

[0009] Furthermore, the lower wall of the limiting disc has a belt passage hole, through which the grinding belt passes in sequence and through the inside of the belt passage block. The inner wall of the grinding belt is provided with internal teeth, and a transmission gear that meshes with the internal teeth is rotatably arranged in the belt passage block.

[0010] Furthermore, the internal rotating part of the pressure ring body is equipped with a transmission gear ring, and the four belt blocks on the two sets of scar removal components are fixedly connected to the transmission gear ring, with the teeth of the transmission gear ring located on its upper wall.

[0011] Furthermore, the transmission assembly includes a first transmission motor assembly and a second transmission motor assembly. Both the first and second transmission motor assemblies are fixed inside the pressure ring body. The rotating part of the first transmission motor assembly is connected to a transmission bevel gear, which meshes with the transmission gear ring. The rotating part of the second transmission motor assembly is connected to the transmission gear.

[0012] Furthermore, the side wall of the pressure ring is connected to a protective tube and a back suction tube. The wires of each component in the pressure ring run along the protective tube until they are connected to the system. The inner wall of the pressure ring is arrayed with back suction holes, which suck away smoke and residue through the back suction tube and back suction holes.

[0013] Furthermore, the outer wall of the ring grinding belt is provided with a strip loading groove, and the alloy strip is embedded in the strip loading groove to form a replaceable structure. The alloy strip is woven from high temperature resistant alloy wire, which serves the same function as the desoldering strip to remove solder, as well as the function of grinding and cutting seams.

[0014] A second aspect of the present invention provides a method of using an automated laser cutting device, comprising the following steps: S1. Adjust the height of the pressure ring body using the electric telescopic rod to press it down onto the surface of the cut plate; S2. Start laser cutting, and at the same time drive the scar removal component to revolve around the cutting point through the transmission component, and drive the ring grinding belt to rotate. S3. Use the alloy ribbon on the outer wall of the ring grinding belt to simultaneously clean and grind the edges of the gaps generated by cutting; S4. During the cutting and cleaning process, smoke and residue are drawn out through the back suction hole and back suction pipe; S5. After cutting and cleaning, raise the pressure ring and remove the equipment.

[0015] The beneficial effects of this invention are as follows: This invention, by attaching a cutting point cleaning mechanism to the outside of the laser cutting head, enables the removal of scars and the grinding of burrs to be carried out simultaneously with the laser cutting process, eliminating the need for additional post-processing steps, thus significantly improving production efficiency and shortening the production cycle. The cutting point cleaning mechanism can clean and polish the edges of the cutting gap in real time, effectively removing cutting scars and burrs, improving the surface quality and edge accuracy of the workpiece, and reducing the defect rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall left-side structure of the present invention; Figure 3 This is a schematic diagram of the compression ring structure of the present invention; Figure 4 This is a schematic diagram of the bottom structure of the pressure ring body of the present invention; Figure 5 This is a schematic diagram of the structure of the scar removal component of the present invention in a rotating state; Figure 6 This is a schematic diagram of the scar removal component structure of the present invention; Figure 7 This is a schematic diagram of the transmission gear ring structure of the present invention; Figure 8 This is a schematic diagram of the ring grinding belt structure of the present invention.

[0017] In the diagram: 11. Laser cutting machine tool; 2. Cutting point cleaning mechanism; 21. Pressure ring body; 22. Electric telescopic rod; 23. Protective tube; 24. Back suction pipe; 25. Back suction hole; 26. Ring groove; 27. Ring slide groove; 28. Induction heating wire; 29. ​​Scar removal assembly; 291. Ring grinding belt; 292. Alloy belt; 293. Transmission gear; 294. Limiting plate; 295. Belt pass block; 296. Belt pass hole; 31. Transmission gear ring; 32. First transmission motor assembly; 33. Transmission bevel gear; 34. Second transmission motor assembly; 35. Belt mounting groove; 36. Internal gear. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1-8 As shown, an automated laser cutting device includes: a laser cutting machine tool 11, and a cutting point cleaning mechanism 2 is sleeved on the outer side of the laser cutting head end of the laser cutting machine tool 11, which is used to remove scars and polish burrs on the edge of the cut. The cutting point cleaning mechanism 2 includes a pressure ring body 21, a scar cleaning component 29, and a transmission component. The pressure ring body 21 has a circular ring structure. The inner ring diameter of the pressure ring body 21 is larger than the outer diameter of the laser cutting head, and the two are set at the same center. Two parallel scar removal components 29 are rotatably mounted on the lower wall of the pressure ring body 21. The distance between the two scar removal components 29 is greater than 5-10 mm of the diameter of the cutting laser beam. Each scar removal component 29 includes a ring grinding belt 291 and two limiting discs 294. The ring grinding belt 291 passes through the two limiting discs 294 that are rotatably connected to the pressure ring body 21 and is in a tensioned state. The outer wall surface of each ring grinding belt 291 is embedded with an alloy ribbon 292. The transmission component is connected to the limit plate 294 to drive the two scar removal components 29 to rotate in a circular motion around the laser cutting point as the rotation center, while keeping the laser irradiation point from contacting each other. At the same time, it drives the two ring grinding belts 291 to rotate in close contact with the surface of the cut plate. Through the friction between the alloy ribbon 292 and the surface of the cut plate, the edge of the gap formed after cutting is cleaned of scars and burrs is polished.

[0020] Two electric telescopic rods 22 are fixedly installed on the upper wall of the pressure ring body 21. The top ends of the two electric telescopic rods 22 are fixed to the laser cutting head of the laser cutting machine tool 11. Both electric telescopic rods 22 are controlled by the system, which controls the electric telescopic rods 22 to drive the pressure ring body 21 to move up and down, pressing it tightly against the periphery of the cutting point, reducing the deformation of the cutting point caused by the heat of laser cutting.

[0021] The lower wall of the pressure ring body 21 is provided with an annular groove 26, and two annular grinding belts 291 are located in the annular groove 26. An induction heating wire 28 is provided around the rotation range of the annular grinding belts 291 in the annular groove 26. The induction heating wire 28 is controlled by the system to preheat and reduce the temperature around the cutting point.

[0022] The annular groove 26 is also provided with an annular sliding groove 27. The limiting plate 294 slides and rotates along the annular sliding groove 27. The upper wall of the limiting plate 294 is fixedly provided with a belt-passing block 295, and the belt-passing block 295 passes through the annular sliding groove 27 and is located inside the pressure ring body 21. Each annular grinding belt 291 has a belt-passing block 295 at both ends.

[0023] The lower wall of the limiting plate 294 has a belt passage hole 296. The annular grinding belt 291 passes through the belt passage hole 296 and the inside of the belt passage block 295 in sequence. The inner wall of the annular grinding belt 291 is provided with internal teeth 36. A transmission gear 293 that meshes with the internal teeth 36 is rotatably arranged in the belt passage block 295.

[0024] The pressure ring body 21 is internally equipped with a transmission gear ring 31. The four belt blocks 295 on the two sets of scar removal components 29 are fixedly connected to the transmission gear ring 31, and the teeth of the transmission gear ring 31 are located on its upper wall.

[0025] The transmission assembly includes a first transmission motor assembly 32 and a second transmission motor assembly 34. Both the first transmission motor assembly 32 and the second transmission motor assembly 34 are fixed inside the pressure ring body 21. The rotating part of the first transmission motor assembly 32 is connected to a transmission bevel gear 33, which meshes with the transmission gear ring 31. The rotating part of the second transmission motor assembly 34 is connected to a transmission gear 293.

[0026] The side wall of the pressure ring 21 is connected to a protective tube 23 and a back suction tube 24. The wires of each device in the pressure ring 21 run along the protective tube 23 until they are connected to the system. The inner wall of the pressure ring 21 is arrayed with back suction holes 25, which suck away smoke and residue through the back suction tube 24 and the back suction holes 25.

[0027] The outer wall of the ring grinding belt 291 is provided with a belt mounting groove 35, and the alloy ribbon 292 is embedded in the belt mounting groove 35 to form a replaceable structure. The alloy ribbon 292 is woven from high temperature resistant alloy wire and serves the same function as the desoldering belt to remove solder and to grind and cut seams.

[0028] The working principle is based on the concept of "integrated synchronous follow-up cleaning". While performing laser cutting, the equipment uses the cutting point cleaning mechanism 2, which is fitted at the end of the laser cutting head, to perform immediate and in-situ treatment on the edge of the newly formed cut seam.

[0029] System positioning and clamping: The CNC system of the laser cutting machine tool 11 controls the laser cutting head to move to the cutting starting point. Simultaneously, the system controls two electric telescopic rods 22 to extend, driving the pressure ring 21 downwards, so that its lower wall smoothly presses against the surface of the material being cut. This downward pressure (typically set between 50-150N) forms a stable annular support zone, effectively suppressing thermal deformation and warping of the material around the cutting point due to instantaneous high temperatures (laser focal temperature can reach over 10000°C). The inner diameter of the pressure ring 21 is larger than the outer diameter of the laser cutting head, ensuring that the laser beam can pass through without interference.

[0030] Preheating and temperature field management (optional enhancements): Before or initially during cutting, the system can control the induction heating wire 28 within the annular groove 26 to preheat the area around the path to be cut (e.g., to 150-300°C). This process has two main scientific benefits: Reduce thermal shock: Preheating reduces the temperature difference ΔT between the cut and non-cut areas. According to the heat conduction formula Q = k*A*ΔT / Δx (where Q is the heat flow rate, k is the thermal conductivity of the material, A is the area, and Δx is the distance), it can slow down the rate at which heat diffuses rapidly to the surroundings, thereby further suppressing the deformation of the sheet material.

[0031] Optimize cleaning conditions: placing the material in a temperature range more suitable for plastic deformation helps with subsequent scar removal.

[0032] Synchronous follow-up cutting and cleaning: As the laser beam begins to cut and moves along the predetermined path, the entire cutting point cleaning mechanism 2 moves synchronously with the laser cutting head. At this time, the core cleaning action is initiated: Revolutionary Drive (Motion Around the Cutting Knife): The system activates the first transmission motor assembly 32, driving the transmission bevel gear 33 to rotate, meshing and driving the transmission gear ring 31 to rotate inside the pressure ring body 21. Since the four belt blocks 295 of the two sets of scar removal assemblies 29 are all fixed under the transmission gear ring 31, the two scar removal assemblies 29, as a whole, begin to perform circular motion around the laser cutting point. Its revolution linear velocity V_revolution is synchronized with or in a fixed proportion to the feed speed V_cut of the laser cutting head, ensuring that the cleaning point always tracks the periphery of the heat-affected zone of the cut.

[0033] Self-rotation drive (grinding belt rotates on its own): The system simultaneously activates the second transmission motor assembly 34, driving the transmission gear 293 to rotate. The transmission gear 293 meshes with the internal teeth 36 on the inner side of the annular grinding belt 291, thereby driving the annular grinding belt 291 to rotate at high speed around its two limiting discs 294. The limiting discs 294 slide along the annular groove 27, ensuring the stability of the movement.

[0034] Composite motion cleaning: Under the combined motion of revolution and rotation, the alloy ribbon 292 embedded in the outer wall of each annular grinding belt 291 is tightly adhered to the surface of the plate with a certain pressure (provided by the downward pressure of the pressure ring body 21 and the gravity of the mechanism). Two annular grinding belts 291 are symmetrically distributed on both sides of the cutting kerf, with a spacing greater than the diameter of the laser beam by 5-10 mm, ensuring that they will not contact or damage the cutting kerf itself.

[0035] Cleaning mechanism: Alloy ribbon 292 is woven from high-temperature resistant alloy wire, and its function is similar to a combination of "high-temperature sanding ribbon" and "soldering absorbing ribbon".

[0036] Mechanical scraping and grinding: A high-speed moving alloy wire directly rubs against the burrs (solidified slag, i.e., "scars") at the edge of the cutting kerf, removing them through shearing and grinding. The material removal rate (MRR) can be qualitatively understood by approximating it as MRR ≈ b * h * V_rotation, where b is the contact width and h is the grinding depth, which is related to the pressure and the high-temperature softening state of the material being treated.

[0037] Thermal adsorption and removal: Within a very short time after cutting (approximately 0.5-3 seconds), the molten metal residue at the seam edge has not yet completely solidified and hardened, remaining in a semi-plastic state. When the high-temperature alloy ribbon 292 comes into contact with these residues, it can "adsorb" and "remove" some of the molten metal residue through surface tension, wetting, and mechanical dragging, achieving an effect similar to solder absorption.

[0038] Slag removal and heat dissipation: Fine metal particles, oxide dust, and a small amount of fumes generated during the cleaning process are captured by the suction holes 25 arrayed on the inner wall of the pressure ring 21 and immediately removed by the external dust removal system through the suction pipe 24. This not only keeps the working area clean and avoids secondary pollution, but also ensures the cleanliness of the working surface of the alloy ribbon 292, maintaining its continuous and effective cleaning capability. The protective tube 23 is responsible for integrating and protecting all power lines and control cables.

[0039] Adaptation and Maintenance: When the alloy wire 292 wears out, it can be easily removed from the mounting groove 35 of the ring abrasion belt 291 for replacement, making maintenance simple.

[0040] Revolutionary improvement in processing efficiency and continuity: It completely changes the traditional multi-process, multi-equipment model of "cutting-transfer-secondary processing" and realizes one-stop processing of "cutting into finished product". It eliminates intermediate steps such as workpiece handling, repositioning, and separate cleaning, and theoretically can improve the overall processing efficiency, including cleaning, by more than 70%, which is particularly suitable for large-scale, automated production lines.

[0041] Advantages of simultaneous hot processing: Cleaning is performed immediately after material cutting, while the heat has not completely dissipated and the metal is still in a relatively soft state. This requires less force, results in a more thorough cleaning, and is less likely to generate new mechanical stress or deformation. Compared to cold post-processing, it can eliminate approximately 95% or more of secondary burrs and weld beads. Example

[0042] A method of using an automated laser cutting device includes the following steps: S1. Adjust the height of the pressure ring 21 by using the electric telescopic rod 22 to press it down onto the surface of the cutting plate; S2. Start laser cutting, and at the same time drive the scar removal component 29 to revolve around the cutting point through the transmission component, and drive the ring grinding belt 291 to rotate. S3. Use the alloy ribbon 292 on the outer wall of the ring grinding belt 291 to simultaneously clean and grind the edges of the gaps generated by cutting. S4. During the cutting and cleaning process, smoke and residue are drawn out through the back suction hole 25 and the back suction pipe 24. S5. After cutting and cleaning, raise the pressure ring body 21 and remove the equipment.

[0043] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. An automated laser cutting device, characterized in that, include: A laser cutting machine tool (11) is provided with a cutting point cleaning mechanism (2) on the outside of the laser cutting head end of the laser cutting machine tool (11) for removing scars and grinding burrs on the edge of the cut seam. The cutting point cleaning mechanism (2) includes a pressure ring body (21), a scar cleaning component (29), and a transmission component. The pressure ring body (21) is a circular ring structure. The inner ring diameter of the pressure ring body (21) is larger than the outer diameter of the laser cutting head, and the two are set at the same center. The lower wall of the pressure ring body (21) is rotatably mounted with two parallel scar removal components (29). The distance between the two scar removal components (29) is greater than 5-10 mm of the diameter of the cutting laser beam. Each scar removal component (29) includes a ring grinding belt (291) and two limiting discs (294). The ring grinding belt (291) passes through the two limiting discs (294) that are rotatably connected to the pressure ring body (21) and is in a tensioned state. The outer wall surface of each ring grinding belt (291) is embedded with an alloy ribbon (292). The transmission component is driven to connect with the limiting plate (294) and is used to drive the two scar removal components (29) to rotate around the laser cutting point as the rotation center, while keeping the laser irradiation point from being contacted, and simultaneously driving the two ring grinding belts (291) to tightly adhere to the surface of the cut plate and rotate. Through the friction between the alloy ribbon (292) and the surface of the cut plate, the edge of the gap formed after cutting is cleaned of scars and burrs is polished.

2. The automated laser cutting equipment according to claim 1, characterized in that, Two electric telescopic rods (22) are fixedly installed on the upper wall of the pressure ring body (21). The top ends of the two electric telescopic rods (22) are fixed on the laser cutting head of the laser cutting machine tool (11). Both electric telescopic rods (22) are controlled by the system. The electric telescopic rods (22) drive the pressure ring body (21) to move up and down, and press tightly on the periphery of the cutting point to reduce the deformation of the cutting point caused by the heat of laser cutting.

3. The automated laser cutting equipment according to claim 2, characterized in that, The lower wall of the pressure ring body (21) is provided with an annular groove (26), and the two annular grinding belts (291) are located in the annular groove (26). An induction heating wire (28) is provided around the rotation range of the annular grinding belts (291) in the annular groove (26). The induction heating wire (28) is controlled by the system to preheat and slow down the temperature around the cutting point.

4. The automated laser cutting equipment according to claim 3, characterized in that, The annular groove (26) is also provided with an annular sliding groove (27). The limiting plate (294) slides and rotates along the annular sliding groove (27). A belt-passing block (295) is fixedly provided on the upper wall of the limiting plate (294), and the belt-passing block (295) passes through the annular sliding groove (27) and is located inside the pressure ring body (21). Each annular grinding belt (291) has a belt-passing block (295) at both ends.

5. An automated laser cutting device according to claim 4, characterized in that, The lower wall of the limiting disk (294) has a belt hole (296). The annular grinding belt (291) passes through the belt hole (296) and the inside of the belt block (295) in sequence. The inner wall of the annular grinding belt (291) is provided with internal teeth (36). The belt block (295) is rotatably provided with a transmission gear (293) that meshes with the internal teeth (36).

6. An automated laser cutting device according to claim 5, characterized in that, The pressure ring body (21) is internally rotatably equipped with a transmission gear ring (31), and the four belt blocks (295) on the two sets of scar removal components (29) are fixedly connected to the transmission gear ring (31), with the teeth of the transmission gear ring (31) located on its upper wall.

7. An automated laser cutting device according to claim 6, characterized in that, The transmission assembly includes a first transmission motor assembly (32) and a second transmission motor assembly (34). Both the first transmission motor assembly (32) and the second transmission motor assembly (34) are fixed inside the pressure ring body (21). The rotating part of the first transmission motor assembly (32) is connected to a transmission bevel gear (33), which meshes with the transmission gear ring (31). The rotating part of the second transmission motor assembly (34) is connected to the transmission gear (293).

8. An automated laser cutting device according to claim 7, characterized in that, The side wall of the pressure ring (21) is connected to a protective tube (23) and a back suction tube (24). The wires of each device in the pressure ring (21) run along the protective tube (23) until they are connected to the system. The inner wall of the pressure ring (21) is arrayed with back suction holes (25), which suck away smoke and residue through the back suction tube (24) and the back suction holes (25).

9. An automated laser cutting device according to claim 8, characterized in that, The outer wall of the ring grinding belt (291) is provided with a belt mounting groove (35), and the alloy ribbon (292) is embedded in the belt mounting groove (35) to form a replaceable structure. The alloy ribbon (292) is woven from high temperature resistant alloy wire and functions as a desoldering ribbon to remove solder and to grind and cut seams.

10. A method of using the automated laser cutting equipment as described in claim 9, characterized in that, Includes the following steps: S1. Adjust the height of the pressure ring (21) by means of the electric telescopic rod (22) so that it is pressed down to the surface of the cutting plate; S2. Start laser cutting, and at the same time drive the scar removal component (29) to revolve around the cutting point through the transmission component, and drive the ring grinding belt (291) to rotate. S3. Use the alloy ribbon (292) on the outer wall of the ring grinding belt (291) to simultaneously clean and grind the edges of the gaps generated by cutting; S4. During the cutting and cleaning process, smoke and residue are drawn out through the back suction hole (25) and back suction pipe (24); S5. After cutting and cleaning, raise the pressure ring body (21) and remove the equipment.

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