Pipe cutting inner wall slag adhering prevention device and laser pipe cutting machine

Abstract

The invention provides a pipe cutting inner wall slag adhering prevention device and a laser pipe cutting machine, relates to the field of laser pipe cutting machines, and aims to solve the problem that the production efficiency is affected due to the fact that a whole plug pipe needs to be replaced after the plug pipe is damaged for slag removal of an existing laser pipe cutting machine, a slag removal pipe is split into a negative pressure pipe and a collecting pipe in the axial direction, and the negative pressure pipe and the collecting pipe are detachably connected. Wherein the collecting pipe directly faces a cutting area, the negative pressure pipe is responsible for being connected with a negative pressure source, rapid disassembly and assembly of the negative pressure pipe and the collecting pipe are achieved, the damaged collecting pipe can be conveniently and independently replaced, the accessory cost is reduced, the replacement efficiency is improved, and therefore shutdown loss is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of laser pipe cutting machines, specifically to a device for preventing slag buildup on the inner wall of pipes during cutting and a laser pipe cutting machine. Background Technology

[0002] When a laser tube cutting machine cuts pipes, the electrical sparks generated during the cutting process splash onto the inner wall of the pipe, causing severe slag buildup. Traditional slag removers use a plug tube with a diameter smaller than the inner diameter of the workpiece. The tail end is connected to an exhaust fan via a duct to form a negative pressure chamber, and a small air inlet is opened directly above the front end for air and slag removal. This reduces smoke and dust pollution and improves the safety and comfort of the operator's surrounding environment. The exhaust fan can efficiently remove cutting fumes by drawing them out from close range through the plug tube.

[0003] While slag removers can improve the cleanliness of the inner wall of workpieces and reduce the need for secondary slag removal, current slag removers are mostly made of carbon steel pipe in one piece, with an air inlet at the front and a hose connected to the exhaust fan at the rear. The working area of ​​the slag remover is located in the center of the laser beam, an area where a large amount of high-temperature smoke and debris are concentrated. The laser beam can easily burn or penetrate the slag remover, causing smoke and slag leakage. This results in incomplete slag removal from the inner wall. After the slag remover is damaged, the entire slag remover needs to be replaced, leading to high costs. Furthermore, disassembling the entire slag remover wastes time and affects the production efficiency of the laser tube cutting machine. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies of existing technologies by providing a pipe cutting inner wall anti-slag device and a laser pipe cutting machine. The slag removal pipe is split axially into a negative pressure pipe and a collection pipe, which are detachably connected. The collection pipe directly faces the cutting area, while the negative pressure pipe is responsible for connecting to the negative pressure source, enabling quick assembly and disassembly of the negative pressure pipe and the collection pipe, and facilitating the individual replacement of the damaged collection pipe.

[0005] The first objective of this invention is to provide a device for preventing slag buildup on the inner wall of pipes during cutting, which employs the following solution: It includes a slag removal pipe, which includes a negative pressure pipe and a collection pipe distributed along the axial direction. One end of the collection pipe is detachably connected to the negative pressure pipe, and the other end is sealed. A collection hole facing the cutting position is opened on the circumferential side wall of the collection pipe. The collection hole is connected to the inside of the negative pressure pipe through the inside of the collection pipe. The end of the negative pressure pipe away from the collection pipe is connected to a negative pressure source.

[0006] Furthermore, the collecting tube is made of copper alloy, and its diameter is matched with that of the negative pressure tube.

[0007] Furthermore, the collection tube is made of copper.

[0008] Furthermore, internal threads are machined in the holes at both ends of the collection tube. One end of the collection tube is connected to the negative pressure tube through a connector, and the other end is fitted with a plug for sealing.

[0009] Furthermore, the connector is provided with external threads at both ends. One end of the connector is connected to the collection pipe, and the other end is connected to the negative pressure pipe through threaded engagement.

[0010] Furthermore, the collection tubes are provided in multiple forms, with different diameters, axial lengths, and / or diameters of the collection holes.

[0011] Furthermore, the collection hole axis is distributed radially along the collection tube, and the collection hole penetrates the sidewall on one side of the collection tube axis.

[0012] Furthermore, the length of the collecting tube is greater than the splashing range of the cutting position, and the maximum diameter of the slag removal tube is smaller than the inner diameter of the cut pipe.

[0013] A second objective of the present invention is to provide a laser pipe cutting machine that utilizes a pipe cutting inner wall anti-slag device as described in the first objective.

[0014] Furthermore, it also includes a laser head and a clamp, the clamp being used to hold the tube being cut, the laser beam output by the laser head being coaxially distributed with the collection hole, and the energy of the laser beam acting on the inner wall of the collection tube when passing through the collection hole is less than the tolerance threshold of the collection tube.

[0015] Compared with the prior art, the advantages and positive effects of this invention are: To address the issue of reduced production efficiency caused by the need to replace the entire slag removal plug tube after damage in current laser tube cutting machines, the slag removal tube is axially split into a negative pressure tube and a collection tube, which are detachably connected. The collection tube directly faces the cutting area, while the negative pressure tube connects to the negative pressure source, enabling quick assembly and disassembly of the two tubes. This facilitates the individual replacement of the damaged collection tube, reduces spare parts costs, improves replacement efficiency, minimizes downtime, and ultimately enhances production efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the anti-slag-sticking device for pipe cutting inner wall in one or more embodiments of the present invention.

[0018] Among them, 1. negative pressure pipe; 2. collection pipe; 3. connector; 4. plug; 5. internal thread; 6. external thread. Detailed Implementation

[0019] Example 1 In a typical embodiment of the present invention, such as Figure 1 As shown, a device for preventing slag buildup on the inner wall of a pipe during cutting is presented.

[0020] Traditional slag removers use a one-piece carbon steel tube plug. Its working area is located at the center of the laser beam and in the area where high-temperature smoke and debris are concentrated, making it susceptible to burns or penetration by the laser beam, leading to smoke and debris leakage and incomplete slag removal. Damaged plugs require replacement of the entire tube, which is not only costly but also time-consuming to disassemble, impacting production efficiency. Carbon steel has poor heat resistance and cannot withstand the impact of laser beams and high-temperature debris for extended periods. Therefore, it is necessary to address the issues of easy damage to the plug, high replacement costs, and time-consuming maintenance while ensuring effective slag removal. The traditional slag remover uses a one-piece carbon steel tube plug, whose working area is located at the center of the laser beam and in the area where high-temperature smoke and debris are concentrated, making it susceptible to burns or penetration by the laser beam, leading to smoke and debris leakage and incomplete slag removal. Damaged plugs require replacement of the entire tube, which is not only costly but also time-consuming to disassemble, impacting production efficiency. Carbon steel has poor heat resistance and cannot withstand the impact of laser beams and high-temperature slag for extended periods. Therefore, while ensuring effective slag removal, it is necessary to address the issues of easy pipe damage, high replacement costs, and time-consuming maintenance, achieving a balance between structural durability, ease of maintenance, and cost control. Based on this, this embodiment provides a slag-preventing device for the inner wall of pipe cutting. It employs a detachably connected negative pressure pipe 1 and a collection pipe 2. The collection pipe 2 faces the cutting area and uses collection holes to collect fumes and waste generated during the cutting process. The collection pipe 2 can be easily detached from the negative pressure pipe 1 and the collection pipe 2. When the collection pipe 2 is damaged, the damaged collection pipe 2 can be replaced separately, improving replacement efficiency.

[0021] like Figure 1 As shown, the anti-slag-adhesion device for the inner wall of the pipe cutting machine mainly includes a slag removal pipe, which can be connected to a negative pressure source. Airflow is drawn in from the end of the slag removal pipe furthest from the negative pressure source, carrying with it fumes and waste generated during the laser pipe cutting process, thus reducing the adhesion of high-temperature waste and dust to the inner wall of the pipe. The slag removal pipe is axially divided into a negative pressure pipe 1 and a collection pipe 2, which are detachably connected. The collection pipe 2 directly faces the cutting area, while the negative pressure pipe 1 connects to the negative pressure source.

[0022] The collecting tube 2 directly contacts the high-temperature debris and laser beam. One end is sealed, and a collecting hole is opened on its circumferential sidewall to absorb the smoke and debris generated during cutting. During laser tube cutting, the laser beam may penetrate the tube wall and continue into the tube, impacting the collecting tube 2 and causing damage. With prolonged operation, accumulated damage to the collecting tube 2 may lead to burn-through, making it difficult to collect smoke and debris. To ensure effective collection, the collecting tube 2 needs to be replaced. To address this, this embodiment uses a detachable connecting collecting tube 2 and negative pressure tube 1, allowing for quick disassembly and replacement between them. The negative pressure tube 1 is located away from the cutting area and only transmits negative pressure, not directly affected by the laser beam and high temperature.

[0023] The collecting pipe 2 and the negative pressure pipe 1 are detachably connected. For example, they can be quickly disassembled and assembled using standard interfaces such as threads and flanges, facilitating the individual replacement of damaged collecting pipe 2. Collecting pipe 2 not only meets the need to collect smoke and debris near the cutting position but also avoids laser beams penetrating it, ensuring that the laser beam continues its transmission and impacts the inner wall of collecting pipe 2, thus extending the laser beam's transmission path and reducing damage to collecting pipe 2. The collecting hole faces the cutting position, utilizing the negative pressure source connected to negative pressure pipe 1 to create suction, ensuring that smoke and debris are effectively drawn into the collecting hole.

[0024] Specifically, in this embodiment, the collecting tube 2 is made of copper alloy. Compared with the carbon steel material of traditional plug tubes, copper alloy has a higher melting point and thermal conductivity, thereby resisting the impact of the laser beam and dissipating the heat generated by the laser beam, reducing the damage of the laser beam to the collecting tube 2.

[0025] The collecting tube 2 can be made of copper, while the negative pressure tube 1 is made of thin-walled stainless steel. The wall thickness of the negative pressure tube 1 is 3mm-4mm to improve overall corrosion resistance. The copper used in the collecting tube 2 facilitates machining, and its higher thermal conductivity compared to traditional carbon steel allows for rapid heat dissipation from the laser beam, preventing localized overheating and melting. Copper also exhibits significant heat resistance, preventing laser ablation, and the service life of the copper collecting tube 2 is considerably longer than that of the carbon steel plug tube.

[0026] The internal thread 5 of copper can be machined using conventional processes such as cutting and tapping, without welding, thus avoiding deformation caused by welding stress and reducing processing costs. Only the collection tube 2 is made of copper, while the negative pressure tube 1 is made of stainless steel, which reduces costs compared to traditional one-piece carbon steel plug tubes.

[0027] Ordinary copper alloys (such as brass) have poor weather resistance and are easily oxidized and corroded in high-temperature fumes. Therefore, in this embodiment, pure copper can be used to improve its durability.

[0028] The collecting pipe 2 has internal threads 5 machined at both ends. One end is connected to the negative pressure pipe 1 via an external threaded connector 3 (6), and the other end is sealed with a plug. In this embodiment, as shown... Figure 1 As shown, the copper collection tube 2 has internal threaded holes at both ends, the left end is plugged with a threaded plug, and the right end is connected to the negative pressure tube 1 with a connector 3.

[0029] The collection pipe 2 and connector 3, as well as the structure and negative pressure pipe 1, can all be connected by threads, enabling quick replacement of the collection pipe 2. Sealant (such as PTFE tape) can be added to the threaded joints to ensure airtightness within the negative pressure pipe 1 and reduce pumping efficiency loss. Connector 3 can use standard interfaces such as G-series pipe threads (e.g., G3 / 8, G1-1 / 2), which can accommodate different specifications of negative pressure pipe 1 and collection pipe 2, reducing the difficulty of procuring spare parts.

[0030] When the collection tube 2 is damaged due to long-term laser burning or debris impact, only the collection tube 2 needs to be replaced, and the negative pressure tube 1 can be maintenance-free for a long time, reducing maintenance costs.

[0031] In this embodiment, multiple specifications of collection pipes 2 can be configured and adapted to various specifications of negative pressure pipes 1. For example, according to the inner diameter of the pipe to be cut, the collection pipes 2 can be divided into four specifications: φ20, φ30, φ60, and φ100. The maximum diameter of the slag removal pipe formed by these four specifications is 5-10 mm smaller than the inner diameter of the pipe, ensuring that the slag removal pipe can be smoothly inserted into the inner cavity of the pipe while avoiding friction with the pipe wall.

[0032] The axial length of the collection tube 2 is adjusted according to the sputtering range at the cutting position. For example, when cutting thick-walled tubes, the length needs to be 20-30mm longer than the sputtering radius to ensure full coverage of the debris splashing area. The diameter of the collection hole is matched with the power of the negative pressure source. Small-diameter collection holes (φ5-10mm) are suitable for low-power laser cutting (≤1kW), while large-diameter collection holes (φ15-20mm) are suitable for high-power cutting (≥2kW), balancing extraction efficiency and negative pressure energy consumption.

[0033] Specifically, the negative pressure pipe 1 has an outer diameter of φ100 mm and a 3-inch internal thread connector 3 welded to its end. A stainless steel external thread connector 3DN80 is also used. The collection pipe 2 has an outer diameter of φ100 mm and a wall thickness of 10 mm. Both ends of the collection pipe 2 are machined with 3-inch internal threads, and the left end is sealed with a 3-inch plug 4.

[0034] Negative pressure pipe 1 has an outer diameter of φ60mm and is welded to the end with a 1.5-inch internal thread connector 3. A stainless steel external thread connector 6 (DN40) is used. Collection pipe 2 has an outer diameter of φ60mm and a wall thickness of 10mm. Both ends of collection pipe 2 are machined with 1.5-inch internal threads, and the left end is sealed with a 1.5-inch plug 4.

[0035] Negative pressure pipe 1 has an outer diameter of φ30 mm and is welded to the end with a 3 / 4 inch internal thread connector 3. It also has a stainless steel external thread connector 3DN20. Collection pipe 2 has an outer diameter of φ30 mm and a wall thickness of 3 mm. Both ends are machined with 3 / 4 inch internal thread, and the left end is sealed with a 3 / 4 inch plug 4.

[0036] Negative pressure pipe 1 has an outer diameter of φ20 mm and is welded to the end with a 3 / 8 inch internal thread connector 3. A stainless steel external thread connector 6 (DN10) is also present. Collection pipe 2 has an outer diameter of φ20 mm and a wall thickness of 3 mm. Both ends are machined with 3 / 8 inch internal threads, and the left end is sealed with a 3 / 8 inch plug 4.

[0037] The collection holes are radially distributed, perpendicular to the axis of collection tube 2, and penetrate the sidewall near the cutting position, forming a direct-acting extraction structure. When the fumes and debris generated by laser cutting splash radially, they are directly sucked in by the negative pressure of the radial holes, reducing escape paths and improving extraction efficiency compared to axial holes. The opening direction of the radial holes is consistent with the main splash direction of the debris, preventing large particles from accumulating at the hole openings. Furthermore, a negative pressure source can be used to achieve pulse pressure for cleaning, reducing the risk of clogging.

[0038] The maximum diameter of the slag removal tube is smaller than the inner diameter of the fitting to ensure that it does not scrape the pipe wall during insertion. For example, the φ100 collection tube 2 is suitable for fittings with an inner diameter greater than 110mm. The length of the collection tube 2 is greater than the splashing range of the cutting position. Taking the φ100 collection tube 2 as an example, its length is 200-300mm, which is suitable for the full circumference cutting splashing area of ​​the fitting.

[0039] When cutting pipes made of different materials (such as carbon steel, stainless steel, and aluminum alloy), the corresponding collection tube 2 (with different diameters and apertures) can be used to match different cutting heat inputs and debris characteristics: when cutting carbon steel, a larger aperture collection tube 2 (φ15-20mm) can be selected to handle high-melting-point oxide debris; when cutting aluminum alloy, a smaller aperture collection tube 2 (φ5-10mm) can be selected to avoid low-melting-point metal droplets clogging the channel.

[0040] During production, only the damaged collection pipe 2 needs to be replaced, instead of the entire slag removal pipe, reducing the cost of accessories. Furthermore, both connector 3 and plug 4 can use standard parts, making procurement of standard parts convenient. The detachable structure reduces replacement time. The collection pipe 2 is made of heat-resistant copper, improving its ablation resistance by 2-3 times, preventing smoke and slag leakage due to pipe rupture and increasing the slag removal pass rate on the inner wall.

[0041] The detachable interface uses standard parts (such as G3 / 8, G3 / 4 thread specifications) to adapt to pipe fittings of different diameters, ensuring strong equipment compatibility and facilitating large-scale production and maintenance. The split structure allows for targeted optimization of the wall thickness of each component. The collection pipe 2 adopts a thin-walled structure, which reduces weight while ensuring strength, lowers the drive load, reduces smoke and slag leakage, lowers the concentration of dust in the workshop, and avoids the risk of laser beam leakage, significantly improving safety.

[0042] Example 2 In another typical embodiment of the present invention, such as Figure 1 As shown, a laser pipe cutting machine is provided, which utilizes the anti-slag-sticking device for the inner wall of the pipe as described in Example 1.

[0043] A laser pipe cutting machine, the core of which is to use the anti-slag device for cutting the inner wall of the pipe as in Example 1, also includes a laser head and a clamp. The clamp is used to hold the pipe to be cut. The laser beam output by the laser head is coaxially distributed with the collection hole. When the laser beam passes through the collection hole and acts on the inner wall of the collection pipe 2, the energy is less than the tolerance threshold of the collection pipe 2.

[0044] The servo drive system of the laser tube cutting machine controls the axial movement of the slag removal tube, precisely positioning the relative position of the collection hole and the cutting point. An exhaust fan is used as a negative pressure source, connected to negative pressure pipe 1 via an air duct, creating negative pressure suction. During cutting, the servo drive sends collection pipe 2 into the inner cavity of the pipe, aligning the collection hole with the cutting position, and the exhaust fan starts to create negative pressure. The fumes and debris generated during laser cutting are drawn in by the negative pressure through the collection hole and discharged through collection pipe 2 and negative pressure pipe 1, preventing slag buildup on the inner wall.

[0045] The diameter of the collection hole is slightly larger than the laser beam spot, allowing the laser beam to penetrate the channel without contacting the hole wall. Combined with the low laser absorption rate and high thermal conductivity of copper, damage to the collection tube 2 is reduced.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for preventing slag buildup on the inner wall of a pipe during cutting, characterized in that, It includes a slag removal pipe, which includes a negative pressure pipe and a collection pipe distributed along the axial direction. One end of the collection pipe is detachably connected to the negative pressure pipe, and the other end is sealed. A collection hole facing the cutting position is opened on the circumferential side wall of the collection pipe. The collection hole is connected to the inside of the negative pressure pipe through the inside of the collection pipe. The end of the negative pressure pipe away from the collection pipe is connected to a negative pressure source.

2. The anti-slag-sticking device for pipe cutting inner wall as described in claim 1, characterized in that, The collection tube is made of copper alloy, and its diameter is matched with that of the negative pressure tube.

3. The anti-slag-sticking device for pipe cutting inner wall as described in claim 2, characterized in that, The collection tube is made of copper.

4. The anti-slag-sticking device for pipe cutting inner wall as described in claim 1, characterized in that, The collecting tube has internal threads machined in the holes at both ends. One end of the collecting tube is connected to the negative pressure tube through a connector, and the other end is fitted with a plug for sealing.

5. The anti-slag-sticking device for pipe cutting inner wall as described in claim 4, characterized in that, The connector has external threads at both ends. One end of the connector is connected to the collection pipe, and the other end is connected to the negative pressure pipe through threaded engagement.

6. The anti-slag-sticking device for pipe cutting inner wall as described in claim 1, characterized in that, The collection tubes are provided in multiple parts, and the diameters, axial lengths and / or diameters of the collection holes of the different collection tubes are different.

7. The anti-slag-sticking device for pipe cutting inner wall as described in claim 6, characterized in that, The collection holes are distributed radially along the collection tube, and the collection holes penetrate the sidewall on one side of the collection tube axis.

8. The anti-slag-sticking device for pipe cutting inner wall as described in claim 1, characterized in that, The length of the collection tube is greater than the splashing range of the cutting position, and the maximum diameter of the slag removal tube is smaller than the inner diameter of the cut pipe.

9. A laser tube cutting machine, characterized in that, The anti-slag-sticking device for pipe cutting inner wall as described in any one of claims 1-8 is used.

10. The laser tube cutting machine as described in claim 9, characterized in that, It also includes a laser head and a clamp. The clamp is used to hold the tube being cut. The laser beam output by the laser head is coaxially distributed with the collection hole. When the laser beam passes through the collection hole and acts on the inner wall of the collection tube, the energy is less than the tolerance threshold of the collection tube.

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