Boiler heat-resistant steel laser cutting anti-oxidation equipment

Abstract

The invention relates to the technical field of laser cutting, and discloses boiler heat-resistant steel laser cutting anti-oxidation equipment which comprises a support used for supporting a header and driving the header to rotate. The device comprises a laser cutter and a nozzle fixedly mounted at the lower end of the laser cutter, the peripheral wall of the nozzle is communicated with a gas inlet pipe, and the interior of the nozzle is rotationally connected with a vortex seat for converting rare gas transversely entering the gas inlet pipe into vortex and two semi-ring seats which are arranged in a bilateral symmetry manner. The boiler heat-resistant steel laser cutting anti-oxidation equipment can effectively solve the problems that in the prior art, a conventional open type direct-current air supply cooling mode is limited in contact area with a cutting face, the heat exchange efficiency is low, only the cutting face of the outer wall can be covered, effective wrapping cannot be formed on the inner wall and the deep layer of a cutting seam, and the service life is long. When laser penetrates through the thick wall, air easily flows into a cutting area from the inner wall side, so that the inner wall is out of control of oxidation, and the protection range is easily interfered by the outside.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, specifically to a laser cutting and anti-oxidation device for boiler heat-resistant steel. Background Technology

[0002] The header is a core pressure-bearing component of a boiler, mostly a thick-walled tubular structure, requiring numerous circumferential interfaces to connect to the heating surface pipes. Laser cutting, due to its high precision and efficiency, has become the mainstream method for header interface processing. Headers are primarily made of heat-resistant steel, but the high temperatures during laser cutting easily cause surface oxidation. This oxide layer can severely affect subsequent welding quality and even reduce the structural pressure-bearing safety; therefore, oxidation prevention is a key technical requirement for header laser cutting.

[0003] Currently, oxidation prevention in laser cutting of containers mainly involves spraying rare gases (such as nitrogen or argon) into the cutting area through the cutting head. The positive pressure of the gas creates a localized gas curtain to isolate oxygen, thus reducing the risk of oxidation by blocking oxygen from contacting the cut surface. However, this method has certain limitations.

[0004] On the one hand, conventional anti-oxidation methods generally involve direct current airflow to the cutting area, which results in a limited contact area with the high-temperature cutting surface, low heat exchange efficiency, and an inability to quickly remove the large amount of heat generated by thick-walled cutting. This can easily expand the heat-affected zone and lead to coarse grains in the heat-resistant steel. Furthermore, this open-type local protection can only cover the outer wall cutting surface and cannot effectively encapsulate the inner wall and the depth of the cutting seam. When the laser penetrates the thick wall, air can easily rush into the cutting area from the inner wall side, causing uncontrolled oxidation of the inner wall. Moreover, the protection range is easily affected by external interference, further expanding the protection blind zone. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a laser cutting anti-oxidation device for boiler heat-resistant steel. This device effectively solves the problems of existing technologies, such as the limited contact area between conventional open-type DC air supply cooling and the cutting surface, low heat exchange efficiency, and the inability to effectively cover the inner wall and the deep layers of the cutting seam when the laser penetrates the thick wall, leading to uncontrolled oxidation of the inner wall, and the protection range being easily affected by external interference.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a laser cutting and anti-oxidation device for boiler heat-resistant steel, comprising:

[0008] Supports for supporting the header and driving its rotation;

[0009] A laser cutter, and a nozzle fixedly mounted at its lower end, the outer peripheral wall of the nozzle being connected to an air inlet pipe, and the nozzle being rotatably connected to a vortex seat that converts the rare gas entering laterally in the air inlet pipe into a downward flowing vortex.

[0010] Two semi-ring seats arranged symmetrically on the left and right, and connecting pieces that are respectively connected to the two semi-ring seats to drive the two semi-ring seats to move synchronously. The two connecting pieces are connected by a linkage and are slidably connected to the base frame.

[0011] The right semi-annular seat has a through groove on its outer peripheral wall near the upper end to prevent the rare gas ejected from the nozzle from escaping rapidly. The right semi-annular seat has symmetrically arranged air inlet channels communicating with the through groove. The left semi-annular seat has symmetrically arranged air outlet channels corresponding to the air inlet channels. The upper end of the left semi-annular seat is connected to an air outlet seat. The lower ends of the two semi-annular seats are connected to a docking assembly. The upper end of the air outlet seat is connected to a sealing assembly. The upper end of the right semi-annular seat is connected to a shielding assembly to prevent welding slag from falling into the air inlet channel.

[0012] Furthermore, the connecting component includes a sliding seat slidably connected to the base frame. The sliding seat has a vertical section, and a cylinder for pushing it to move is connected to the left sliding seat. The fixed frame and the elastic frame are slidably assembled on the vertical section, and the fixed frame and the elastic frame are both hinged to the corresponding semi-ring seat. The elastic frame is connected to the support plate preset on the vertical section of the sliding seat through a longitudinally arranged return spring. When the two semi-ring seats are spliced ​​to form a ring structure, the fixed frame, elastic frame, return spring and support plate on the two connecting components are all centrally symmetrically distributed about the central axis of the ring structure.

[0013] Furthermore, both the fixed frame and the elastic frame adopt a two-section design, consisting of a horizontal section near the semi-ring seat and an inclined section near the vertical section of the sliding seat.

[0014] Furthermore, the linkage includes a transmission gear rotatably connected to the base frame, and two racks symmetrically distributed front and rear, respectively connected to the lower ends of the two sliding seats and meshing with the transmission gear.

[0015] Furthermore, the vortex seat includes a rotating seat, the outer contour of which matches the inner contour of the nozzle and is rotatably connected in the nozzle. The outer peripheral wall of the rotating seat has an annular groove communicating with the air inlet pipe. Fan blades are uniformly fixedly connected in the annular groove along the circumference. The rotating seat has a channel that allows the laser to pass through through its upper and lower parts. The outer peripheral wall of the conical section of the rotating seat has an air outlet groove that is uniformly opened in the circumference between adjacent fan blades to guide the outside.

[0016] Furthermore, the docking assembly includes a mounting slot, which is located at the lower end of the semi-annular seat and connects the inlet and outlet air passages to the outside. The mounting slot is fixedly connected to a connecting frame, and a sealing plate for sealing the outlet of the mounting slot is slidably connected to the connecting frame via a connecting rod. A retaining spring is connected between the sealing plate and the connecting frame. A guide rod is fixedly connected to the end of the left sealing plate away from the connecting frame. The elastic coefficient of the left retaining spring is greater than that of the right retaining spring.

[0017] Furthermore, the sealing component includes a connecting seat fixedly connected in the air outlet seat. The connecting seat is a cavity with an opening at the right end. A rectangular plate is slidably connected inside the cavity by a traction spring. The connecting seat is connected to the air outlet channel through a strip groove one evenly opened at the left end. A strip groove two that is offset from the strip groove one is opened on the rectangular plate.

[0018] Furthermore, the height of the second strip groove is higher than the height of the lower end of the nozzle during operation.

[0019] Furthermore, the shielding assembly includes a shielding seat fixedly connected to the top of the right semi-ring seat and the air intake channel. The shielding seat is a cavity with openings at both the left and right ends. A guide plate inclined to the lower right is fixedly connected to the upper wall of the shielding seat cavity, and a baffle inclined to the upper side is rotatably connected to the lower wall of the shielding seat cavity via a torsion spring.

[0020] The technical solution provided by this invention has the following advantages compared with the prior art:

[0021] 1. This invention employs a vortex seat design to optimize airflow pattern. Rare gas introduced laterally through the intake pipe impacts the fan blades on the vortex seat, causing it to rotate and transforming the gas into a downward-spraying vortex airflow. Compared to traditional direct current air supply, this significantly increases the contact area with the cutting surface, improves the density of the oxygen barrier, and quickly carries away the heat generated during cutting, effectively reducing the heat-affected zone and preventing the problem of coarse grains in heat-resistant steel due to high temperatures. This significantly improves the anti-oxidation effect and protects the material's mechanical properties.

[0022] 2. This invention constructs a closed protective space through a splicable annular semi-annular seat. Under the coordinated drive of the linkage and connecting parts, the two semi-annular seats are precisely connected to form an annular structure. With the help of the through groove to block the rapid dissipation of rare gas ejected from the nozzle, a stable positive pressure oxygen-isolated environment is constructed. At the same time, some gas circulates through the inlet and outlet air channels to form a secondary air curtain, realizing double-layer protection inside and outside the cutting area. This not only solves the defect of traditional open protection being easily interfered with by external airflow, but also forms a comprehensive wrapping of the deep cutting seam and the inner wall of the header, preventing the oxidation runaway problem caused by air rushing in from the inner wall side.

[0023] 3. The invention's multiple sealing and anti-clogging structures ensure stable equipment operation. The sealing plate of the docking component, under the action of the clamping spring, achieves precise flow channel conduction and normal sealing during semi-annular seat docking, preventing gas leakage. The sealing component normally seals the flow channel through the traction spring, and automatically opens with the airflow pressure during operation to prevent impurities from entering. The guide plate of the shielding component and the baffle driven by the torsion spring can both guide the smooth flow of gas and prevent cutting and welding slag from falling into the air intake channel. The multiple structures work together to ensure the cleanliness of the flow channel and the long-term stable operation of the equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the processing object box according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0027] Figure 3 This is an embodiment of the present invention. Figure 2 Front view structural diagram;

[0028] Figure 4 This is a schematic diagram of the structure of the laser cutter, nozzle, air inlet pipe, and vortex seat according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the vortex seat structure according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the separated structure of the laser cutter, connector, and base frame according to an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the two semi-ring seats before splicing in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure after splicing two semi-ring seats according to an embodiment of the present invention;

[0033] Figure 9 This is an embodiment of the present invention. Figure 8 Front view structural diagram;

[0034] Figure 10 This is a schematic diagram of the structure of the enclosed component according to an embodiment of the present invention;

[0035] Figure 11 This is a schematic diagram of the structure of the shielding component according to an embodiment of the present invention;

[0036] Figure 12 This is an embodiment of the present invention. Figure 8 A magnified structural diagram of part A in the middle.

[0037] The labels in the diagram represent: 1. Support; 2. Laser cutter; 3. Nozzle; 4. Air inlet pipe; 5. Vortex seat; 51. Rotary seat; 52. Annular groove; 521. Fan blade; 53. Channel; 54. Air outlet groove; 6. Semi-annular seat; 61. Through groove; 62. Air inlet channel; 63. Air outlet channel; 64. Air outlet seat; 65. Connecting assembly; 651. Mounting groove; 652. Connecting frame; 653. Sealing plate; 654. Clamping spring; 655. Guide rod; 66. Enclosure assembly; 661. Connecting seat; 662. Traction spring; 663. Rectangular plate; 664. Strip groove one; 665. Strip groove two; 67. Blinding assembly; 671. Blinding seat; 672. Guide plate; 673. Torsion spring; 674. Baffle; 7. Connecting piece; 71. Sliding seat; 72. Fixing frame; 73. Elastic frame; 74. Return spring; 75. Support plate; 8. Linkage piece; 81. Transmission gear; 82. Rack; 9. Base frame. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] The present invention will be further described below with reference to embodiments.

[0040] Example:

[0041] Please see Figure 1 - Figure 12 This invention provides a technical solution: a laser cutting and anti-oxidation device for boiler heat-resistant steel, comprising:

[0042] Support 1 is used to support the header and drive its rotation;

[0043] The laser cutter 2 and the nozzle 3 fixedly installed at its lower end, the outer peripheral wall of the nozzle 3 is connected to the air inlet pipe 4, and the nozzle 3 is rotatably connected to the vortex seat 5, which converts the rare gas that enters laterally in the air inlet pipe 4 into a downward flowing vortex.

[0044] Two semi-ring seats 6 are arranged symmetrically on the left and right, and connecting pieces 7 are respectively connected to the two semi-ring seats 6 to push the two semi-ring seats 6 to move synchronously. The two connecting pieces 7 are connected by a linkage 8 and are slidably connected to the base frame 9.

[0045] The right semi-annular seat 6 has a through groove 61 on its outer peripheral wall near the upper end to prevent the rare gas ejected from the nozzle 3 from escaping rapidly. The right semi-annular seat 6 has symmetrically arranged air inlet channels 62 that communicate with the through groove 61. The left semi-annular seat 6 has symmetrically arranged air outlet channels 63 that correspond to the air inlet channels 62. The upper end of the left semi-annular seat 6 is connected to an air outlet seat 64. The lower ends of the two semi-annular seats 6 are connected to a docking assembly 65. The upper end of the air outlet seat 64 is connected to a sealing assembly 66. The upper end of the right semi-annular seat 6 is connected to a shielding assembly 67 to prevent welding slag from falling into the air inlet channel 62.

[0046] Specifically, current laser cutting anti-oxidation processes for heat-resistant steel in container boxes mostly employ the laser cutting head to directly spray rare gases such as nitrogen and argon into the cutting area. The positive pressure of the gas creates a localized gas curtain on the cutting surface, isolating oxygen and thus reducing the degree of oxidation at the cutting point. However, this traditional protection method has significant technical limitations:

[0047] On the one hand, conventional anti-oxidation methods use direct current airflow to deliver rare gases to the cutting area. The gas contacts the high-temperature cutting surface in a unidirectional linear scouring state, resulting in a limited contact area and low heat exchange efficiency. This makes it difficult to quickly remove the large amount of heat generated during the cutting of thick-walled heat-resistant steel, which can easily lead to an expansion of the heat-affected zone in the cutting area, resulting in coarse grains in the heat-resistant steel and affecting the mechanical properties of the material. On the other hand, this open local protection structure can only cover the cutting surface of the outer wall of the header, and it is difficult to effectively wrap and protect the deep cutting seam and the inner wall of the header. When the laser penetrates the thick-walled heat-resistant steel, air can easily rush into the cutting area from the inner wall side of the header, causing uncontrolled oxidation of the inner wall. Moreover, the protection range of the open protection is easily affected by external airflow, further expanding the oxygen isolation protection blind zone.

[0048] To overcome the aforementioned shortcomings, this invention makes targeted improvements to the traditional anti-oxidation structure and airflow delivery method. On the one hand, it abandons the conventional direct current blowing method and sets up a vortex seat 5 inside the nozzle 3. The airflow impact force when the air is introduced laterally through the air inlet pipe 4 drives the vortex seat 5 to rotate, transforming the originally laterally entering rare gas into a downward-spraying vortex airflow. Compared with direct current airflow, the vortex airflow can not only significantly increase the contact area with the cutting surface and enhance the density of the oxygen barrier, but also quickly carry away the heat generated by cutting, effectively reducing the heat-affected zone and preventing coarse grains in the heat-resistant steel. On the other hand, two splicable semi-ring seats 6 are added. The annular wrapping structure of the semi-ring seats 6 blocks and constrains the rare gas in the cutting area, preventing its rapid dissipation, thereby constructing a stable oxygen-isolated environment. The specific operation process is as follows:

[0049] Before processing, the two semi-ring seats 6 are separated under the pull of the connector 7, which makes it easy for the operator to place the header stably and position it on the support 1. The support 1 can drive the header to rotate around its own axis to meet the cutting requirements of different positions around the header.

[0050] After the header is positioned, the linkage 8 synchronously drives the two connecting parts 7 to move the semi-ring seats 6 towards each other and precisely splice them into a complete ring structure. The lower end of the semi-ring seats 6 is sealed and connected through the docking component 65 to ensure that the air inlet channel 62 of the right semi-ring seat 6 is precisely connected to the air outlet channel 63 of the left semi-ring seat 6. At the same time, the base frame 9 can move horizontally in the front and back direction, driving the spliced ​​semi-ring seats 6 to move synchronously with the laser cutter 2, adapting to the protection requirements of different cutting positions of the header along the axis. In addition, the inner walls of the two semi-ring seats 6 are embedded with ball bearings, which roll in contact with the outer wall of the header, ensuring that the semi-ring seats 6 stably wrap the header without interfering with the circumferential rotation of the header, thus ensuring the smoothness of the cutting process.

[0051] After the splicing is completed, the displacement of the connecting piece 7 is finely adjusted by the linkage 8, which drives the spliced ​​semi-ring seat 6 to rotate slightly counterclockwise around the central axis of the header. This makes the through groove 61 on the right semi-ring seat 6 precisely aligned with the uppermost end of the outer wall of the header and the lower end of the nozzle 3 of the laser cutter 2. The vortex-shaped rare gas ejected from the nozzle 3 enters the through groove 61, effectively blocking the rare gas and preventing it from dissipating rapidly. This creates a stable positive pressure oxygen-barrier environment in the cutting area, greatly reducing the interference of external airflow on the protective effect and eliminating the blind spots of traditional open protection.

[0052] Meanwhile, some of the rare gases entering the sealed chamber are pushed by the airflow impact force to automatically open the shielding component 67, effectively preventing welding slag from falling into the air intake channel 62 during the cutting process and causing blockage. At the same time, it also collects some of the rare gases in the through groove 61. This part of the rare gases enters the air outlet channel 63 of the left semi-annular seat 6 through the air intake channel 62 and is discharged outward from the air outlet seat 64. The impact force of the discharged airflow acts on the sealing component 66 simultaneously to open it. The gas sprayed outward can form a secondary air curtain above the header cutting area, further dispersing the surrounding oxygen and achieving double-layer oxygen isolation protection inside and outside the cutting area. This effectively solves the defect of traditional protection that can only cover the outer wall cutting surface, forming an all-round wrapping of the deep cutting seam and the inner wall of the header, eliminating the problem of air rushing into the cutting area from the inner wall side from the root.

[0053] The connecting member 7 includes a sliding seat 71 slidably connected to the base frame 9. The sliding seat 71 has a vertical section. A cylinder that pushes the sliding seat 71 to move is connected to the left sliding seat 71. The fixed frame 72 and the elastic frame 73 are respectively slidably assembled on the vertical section. The fixed frame 72 and the elastic frame 73 are both hinged to the corresponding semi-ring seat 6. The elastic frame 73 is connected to the support plate 75 preset on the vertical section of the sliding seat 71 through a longitudinally arranged return spring 74. When the two semi-ring seats 6 are spliced ​​to form a ring structure, the fixed frame 72, the elastic frame 73, the return spring 74 and the support plate 75 on the two connecting members 7 are all centrally symmetrically distributed about the central axis of the ring structure.

[0054] Both the fixed frame 72 and the elastic frame 73 adopt a two-section design, consisting of a horizontal section near the semi-ring seat 6 and an inclined section near the vertical section of the sliding seat 71, to avoid jamming when sliding up and down.

[0055] The linkage 8 includes a transmission gear 81 rotatably connected to the base frame 9, and two racks 82 symmetrically distributed front and rear, respectively connected to the lower ends of the two sliding seats 71 and meshing with the transmission gear 81.

[0056] Specifically, the extension and retraction of the cylinder piston rod drives the left sliding seat 71 connected to it to slide along the base frame 9. The movement of the sliding seat 71 is transmitted synchronously to the other sliding seat 71 through the meshing transmission action of the rack 82 and the transmission gear 81, thereby driving the two sliding seats 71 to move closer or further away synchronously, thus achieving precise splicing and stable separation of the two semi-ring seats 6.

[0057] In the initial state, the two elastic frames 73 are in the maximum extended state. With the pre-tightening force of the return spring 74, the two semi-ring seats 6 are precisely aligned at the top and bottom ends in the initial position and symmetrically distributed on both sides of the header. This provides sufficient operating space for the stable placement of the header and ensures the consistency of the reference for subsequent docking operations.

[0058] After the header is placed on the support 1 and positioned, the cylinder drives the two sliding seats 71 to move closer together. The thrust of the fixed frame 72 and the elastic frame 73 drives the two semi-ring seats 6 to move towards each other and precisely align. Then, with the continuous drive of the cylinder, the fixed frame 72 adaptively slides along the vertical section of the sliding seat 71, and the elastic frame 73 synchronously adaptively extends and retracts and slides up and down along the vertical section. Based on the central symmetrical distribution characteristics of the two sets of connecting parts 7 about the central axis of the ring structure, and the fixed frame 72 connected to the right semi-ring seat 6 is assembled at a height above the central axis of the header, under the continuous action of the driving force, the spliced ​​ring semi-ring seat 6 can be driven to rotate counterclockwise around the central axis of the header by a specific angle. Finally, the through groove 61 on the right semi-ring seat 6 is precisely moved to the uppermost end of the outer wall of the header and precisely aligned with the lower end of the nozzle 3 of the laser cutter 2, providing a reliable structural guarantee for the stable delivery of vortex rare gas and oxygen isolation protection.

[0059] The vortex seat 5 includes a swivel seat 51. The outer contour of the swivel seat 51 matches the inner contour of the nozzle 3 and is rotatably connected in the nozzle 3. The outer peripheral wall of the swivel seat 51 has an annular groove 52 that communicates with the air inlet pipe 4. Fan blades 521 are uniformly fixedly connected in the annular groove 52 along the circumference. The swivel seat 51 has a channel 53 that allows the laser to pass through through the upper and lower parts. The outer peripheral wall of the conical section of the swivel seat 51 has an air outlet groove 54 that is uniformly opened in the circumference between adjacent fan blades 521 to guide the outside.

[0060] Specifically, after the rare gas blown in laterally through the intake pipe 4 enters the annular groove 52, the airflow impacts the circumferentially evenly distributed fan blades 521, causing the rotating seat 51 to rotate smoothly within the nozzle 3. During this process, the annular groove 52 serves to converge and divide the airflow, avoiding energy loss caused by direct airflow impact. As the rotating seat 51 rotates, the gas entering the annular groove 52 is continuously ejected through the outlet grooves 54 between adjacent fan blades 521. Under the centrifugal force of the rotating seat 51 and the guiding effect of the outlet grooves 54, the gas originally input laterally is transformed into a downward-spraying regular vortex. Compared with traditional direct airflow, this vortex can not only significantly increase the contact area with the cutting area and improve the density and coverage of the oxygen barrier, but also quickly carry away the heat generated by cutting and diffuse it outward, effectively reducing the heat-affected zone. At the same time, the channel 53 inside the rotating seat 51 ensures that the laser beam passes through unobstructed throughout the process, ensuring that the cutting operation and anti-oxidation protection are carried out simultaneously and efficiently.

[0061] The docking assembly 65 includes a mounting groove 651, which is located at the lower end of the semi-annular seat 6 and connects the inlet air passage 62 and the outlet air passage 63 to the outside. The mounting groove 651 is fixedly connected to a connecting frame 652. A sealing plate 653 for sealing the outlet of the mounting groove 651 is slidably connected to the connecting frame 652 via a connecting rod. A retaining spring 654 is connected between the sealing plate 653 and the connecting frame 652. A guide rod 655 is fixedly connected to the end of the left sealing plate 653 away from the connecting frame 652. The elastic coefficient of the left retaining spring 654 is greater than that of the right retaining spring 654.

[0062] Specifically, in the initial state, under the pre-tightening force of the clamping spring 654, both sealing plates 653 are tightly abutted against the connection between the mounting groove 651 and the outside, achieving closure of the lower end of the semi-ring seat 6. When the two semi-ring seats 6 move towards each other and begin to dock, the guide rod 655 on the left sealing plate 653 first contacts the right sealing plate 653 and applies a pushing force. Since the elastic coefficient of the left clamping spring 654 is greater than that of the right, the right clamping spring 654 is compressed first and drives the right sealing plate 653 to slide along the connecting rod into the mounting groove 651, so that the air intake channel 62 of the right semi-ring seat 6 is initially opened through the mounting groove 651; as the two semi-ring seats... As the two semi-ring seats 6 continue to approach, the right-side clamping spring 654 is compressed to a preset limit. The reaction force on the guide rod 655 gradually increases and is transmitted to the left-side sealing plate 653, pushing the left-side clamping spring 654 to compress. This, in turn, causes the left-side sealing plate 653 to slide along the connecting rod into the mounting groove 651. Finally, when the two semi-ring seats 6 are in place, the inlet air passage 62 and the outlet air passage 63 are fully connected through the mounting groove 651. The continuous elastic force of the clamping spring 654 can keep the sealing plate 653 in close contact with the inner wall of the mounting groove 651, ensuring the sealing performance after the flow passage is connected, preventing rare gas from leaking from the docking gap, and ensuring the stability of oxygen isolation protection.

[0063] The enclosed component 66 includes a connecting seat 661 fixedly connected to the air outlet seat 64. The connecting seat 661 is a cavity structure with an opening at the right end. A rectangular plate 663 is slidably connected to the cavity of the connecting seat 661 through a traction spring 662. The left end of the connecting seat 661 is evenly provided with a first strip groove 664 that communicates with the air outlet channel 63. The rectangular plate 663 is provided with a second strip groove 665 that is staggered from the first strip groove 664. The second strip groove 665 is higher than the lower end of the nozzle 3 in the working state. This height difference design allows the ejected gas to form an air curtain above the nozzle 3, expanding the longitudinal coverage of the oxygen isolation protection.

[0064] The shielding assembly 67 includes a shielding seat 671 fixedly connected to the top of the right semi-annular seat 6 and communicating with the air inlet channel 62. The shielding seat 671 is a cavity structure with openings at both the left and right ends. A guide plate 672 inclined to the lower right is fixedly connected to the upper wall of the cavity of the shielding seat 671. A baffle 674 inclined upwards is rotatably connected to the lower wall of the cavity of the shielding seat 671 through a torsion spring 673. The inclination angle of the guide plate 672 is adapted to the inclination state of the baffle 674, which can achieve sealing under normal conditions and can be opened smoothly under the action of airflow. At the same time, the guide plate 672 can guide the spattered welding slag to slide down, preventing the welding slag from accumulating inside the shielding seat 671.

[0065] Specifically, in the initial state, the rectangular plate 663, under the pre-tightening force of the traction spring 662, tightly abuts against the inner wall of the cavity of the connecting seat 661, so that the first strip groove 664 and the second strip groove 665 are completely misaligned, achieving a sealed closure of the outlet air passage 63. With the cooperation of the sealing plate 653 of the lower docking component 65, it can prevent external dust, welding slag and other impurities from entering the flow channel of the left semi-annular seat 6. At the same time, the baffle 674, under the torsion force of the torsion spring 673, tightly abuts against the lower end of the guide plate 672, forming a sealed closure of the upper end of the inlet air passage 62 of the right semi-annular seat 6. With the cooperation of the sealing plate 653 of the lower docking component 65, it achieves the normal closure of the flow channel of the right semi-annular seat 6. This double sealing structure can significantly improve the cleanliness and sealing performance of the flow channel in the non-working state and reduce the risk of flow channel blockage.

[0066] When laser cutting is performed, the vortex-shaped rare gas ejected from nozzle 3 enters the closed chamber formed by the semi-annular seat 6 and the header through the through groove 61. The airflow pressure in the chamber gradually increases and acts on the baffle 674, pushing the baffle 674 to overcome the torsion of the torsion spring 673 and rotate towards the inside of the shielding seat 671 cavity, thereby opening the shielding seat 671. During this process, the guide plate 672, which is tilted to the lower right, can effectively block and guide the spatter generated by cutting, so that the spatter slides down the inclined surface of the guide plate 672, completely preventing the spatter from entering the air intake channel 62 and causing blockage.

[0067] Some rare gases enter the intake channel 62 through the opened shield 671, then enter the outlet channel 63 through the channel opened by the docking component 65, and finally flow into the cavity of the connecting seat 661 of the outlet seat 64. The impact force of the airflow pushes the rectangular plate 663 to slide towards the opening end of the connecting seat 661, overcoming the elastic force of the traction spring 662. The gas is then ejected through two sets of strip groove one 664 and strip groove two 665. Since the height of strip groove two 665 is higher than the lower end of the nozzle 3, the ejected gas forms an air curtain in the area above the nozzle 3, which can further disperse the oxygen above the cutting area. Together with the vortex gas ejected from the nozzle 3, it forms a double-layer oxygen barrier protection structure, eliminating the upper oxygen interference blind zone that exists in traditional protection methods and improving the overall anti-oxidation effect.

[0068] It is worth noting that the aforementioned laser cutting and anti-oxidation equipment for boiler heat-resistant steel also has the following advantages:

[0069] Advantage 1: This invention adopts a vortex seat 5 design to optimize the airflow pattern. The rare gas input laterally through the air inlet pipe 4 impacts the fan blades 521 on the vortex seat 51, causing it to rotate and converting the gas into a downward-spraying vortex airflow. Compared with traditional direct current air supply, this significantly increases the contact area with the cutting surface, improves the density of the oxygen barrier, and can quickly carry away the heat generated by cutting and diffuse it outward, effectively reducing the heat-affected zone and avoiding the problem of coarse grains in heat-resistant steel due to high temperature. This significantly improves the anti-oxidation effect and the protection of material mechanical properties.

[0070] Advantage 2: This invention constructs a closed protective space through a splicable annular semi-annular seat 6. Under the coordinated drive of the linkage 8 and the connector 7, the two semi-annular seats 6 precisely dock to form an annular structure. Combined with the through groove 61 to block the rapid dissipation of rare gas ejected from the nozzle 3, a stable positive pressure oxygen-barrier environment is constructed. At the same time, some gas circulates through the inlet air channel 62 and the outlet air channel 63 to form a secondary air curtain, achieving double-layer protection inside and outside the cutting area. This not only solves the defect of traditional open protection being easily interfered with by external airflow, but also forms a comprehensive wrapping of the deep cutting seam and the inner wall of the header, preventing the oxidation runaway problem caused by air rushing in from the inner wall side.

[0071] Thirdly, this invention improves operational adaptability by relying on synchronous drive and adaptive adjustment structure. The cylinder drives the two sliding seats 71 to move synchronously through the gear rack 82, realizing the precise splicing and separation of the semi-ring seat 6, which facilitates the picking, placing and positioning of the header. After splicing, the angle of the semi-ring seat 6 can be finely adjusted by the elastic frame 73 and the fixed frame 72 of the connecting piece 7, so that the through groove 61 is precisely aligned with the nozzle 3. Moreover, the base frame 9 can drive the semi-ring seat 6 to move synchronously with the laser cutter 2, adapting to the circumferential rotation cutting of the header and the processing requirements of different axial positions, which greatly improves the ease of operation and processing adaptability of the equipment.

[0072] Fourthly, the multiple sealing and anti-clogging structures of this invention ensure stable operation of the equipment. Under the action of the clamping spring 654, the sealing plate 653 of the docking component 65 achieves precise conduction and normal sealing of the flow channel when the semi-ring seat 6 is docked, avoiding gas leakage. The sealing component 66 seals the flow channel under normal conditions through the traction spring 662, and automatically opens with the airflow pressure during operation to prevent impurities from entering. The guide plate 672 of the shielding component 67 and the baffle 674 driven by the torsion spring 673 can not only guide the smooth flow of gas, but also prevent cutting and welding slag from falling into the air intake channel 62. The multiple structures work together to ensure the cleanliness of the flow channel and the long-term stable operation of the equipment.

[0073] Fifthly, the ball bearing design embedded in the inner wall of the semi-ring seat 6 in this invention takes into account both protective stability and smooth operation. The assembled semi-ring seat 6 makes rolling contact with the outer wall of the header through the ball bearing, which not only ensures the airtightness of the annular protective space and provides structural support for oxygen isolation protection, but also does not interfere with the circumferential rotation of the header driven by the support 1, ensuring the smooth rotation of the header during laser cutting and achieving a simultaneous improvement in protective effect and processing efficiency.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser cutting and anti-oxidation device for boiler heat-resistant steel, characterized in that, include: Support for the header and for rotating it (1); A laser cutter (2) and a nozzle (3) fixedly installed at its lower end, the outer peripheral wall of the nozzle (3) being connected to an air inlet pipe (4), and the nozzle (3) being rotatably connected to a vortex seat (5) that converts the rare gas that enters laterally in the air inlet pipe (4) into a vortex. Two semi-ring seats (6) are arranged symmetrically on the left and right, and connecting pieces (7) are connected to the two semi-ring seats (6) respectively to push the two semi-ring seats (6) to move synchronously. The two connecting pieces (7) are connected by a linkage piece (8) and are slidably connected to the base frame (9). Among them, the outer peripheral wall of the right semi-ring seat (6) near the upper end is provided with a through groove (61) to prevent the rare gas ejected from the nozzle (3) from escaping quickly. The right semi-ring seat (6) is provided with an inlet air passage (62) that communicates with the through groove (61) symmetrically in front and back. The left semi-ring seat (6) is provided with an outlet air passage (63) that corresponds to the inlet air passage (62) symmetrically in front and back. The upper end of the left semi-ring seat (6) is connected to an outlet seat (64). The lower ends of the two semi-ring seats (6) are connected to a docking assembly (65). The upper end of the outlet seat (64) is connected to a sealing assembly (66). The upper end of the right semi-ring seat (6) is connected to a shielding assembly (67) to prevent welding slag from falling into the inlet air passage (62).

2. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 1, characterized in that: The connector (7) includes a sliding seat (71) slidably connected to the base frame (9). The sliding seat (71) has a vertical section. A cylinder is connected to the left sliding seat (71) to push it to move. The fixed frame (72) and the elastic frame (73) are respectively slidably assembled on the vertical section. The fixed frame (72) and the elastic frame (73) are both hinged to the corresponding semi-ring seat (6). The elastic frame (73) is connected to the support plate (75) preset on the vertical section of the sliding seat (71) through the longitudinally arranged return spring (74). When the two semi-ring seats (6) are spliced ​​to form a ring structure, the fixed frame (72), elastic frame (73), return spring (74) and support plate (75) on the two connectors (7) are all centrally symmetrical about the central axis of the ring structure.

3. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 2, characterized in that: Both the fixed frame (72) and the elastic frame (73) adopt a two-section design, consisting of a horizontal section near the semi-ring seat (6) and an inclined section near the vertical section of the sliding seat (71).

4. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 2, characterized in that: The linkage (8) includes a transmission gear (81) rotatably connected to the base frame (9), and two racks (82) symmetrically distributed front and rear, respectively connected to the lower ends of the two sliding seats (71) and meshing with the transmission gear (81).

5. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 1, characterized in that: The vortex seat (5) includes a swivel seat (51). The outer contour of the swivel seat (51) matches the inner contour of the nozzle (3) and is rotatably connected in the nozzle (3). The outer peripheral wall of the swivel seat (51) is provided with an annular groove (52) that communicates with the air inlet pipe (4). Fan blades (521) are uniformly fixedly connected in the annular groove (52) along the circumferential direction. The swivel seat (51) is provided with a channel (53) that allows the laser to pass through through the upper and lower parts. The outer peripheral wall of the conical section of the swivel seat (51) is provided with an air outlet groove (54) that is uniformly opened in the circumferential direction between adjacent fan blades (521).

6. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 1, characterized in that: The docking assembly (65) includes a mounting groove (651), which is located at the lower end of the semi-ring seat (6) and connects the inlet air passage (62) and the outlet air passage (63) to the outside. The mounting groove (651) is fixedly connected to a connecting frame (652). A sealing plate (653) for sealing the outlet of the mounting groove (651) is slidably connected to the connecting frame (652) via a connecting rod. A retaining spring (654) is connected between the sealing plate (653) and the connecting frame (652). A guide rod (655) is fixedly connected to the end of the left sealing plate (653) away from the connecting frame (652). The elastic coefficient of the left retaining spring (654) is greater than that of the right retaining spring (654).

7. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 1, characterized in that: The sealing component (66) includes a connecting seat (661) fixedly connected to the air outlet seat (64). The connecting seat (661) is a cavity with an opening at the right end. A rectangular plate (663) is slidably connected to the cavity through a traction spring (662). The connecting seat (661) is connected to the air outlet channel (63) through a strip groove (664) evenly opened at the left end. A strip groove (665) is opened on the rectangular plate (663) that is misaligned with the strip groove (664).

8. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 7, characterized in that: The height of the second strip groove (665) is higher than the height of the lower end of the nozzle (3) in the working state.

9. The laser cutting and anti-oxidation equipment for boiler heat-resistant steel according to claim 1, characterized in that: The shielding assembly (67) includes a shielding seat (671) fixedly connected to the top of the right semi-ring seat (6) and the air intake channel (62). The shielding seat (671) is a cavity with openings at both the left and right ends. A guide plate (672) inclined to the lower right is fixedly connected to the upper wall of the cavity of the shielding seat (671). A baffle (674) inclined to the upper side of the seat is rotatably connected to the lower wall of the cavity of the shielding seat (671) through a torsion spring (673).

Images