Gas industrial furnace shell welding device

Abstract

The invention relates to the technical field of furnace shell welding, in particular to a gas industrial furnace shell welding device which integrates a radial circular seam and an axial longitudinal seam, a servo motor drives a planetary gear train through an intermittent sheave, a rotating shell drives a clamped furnace shell to rotate, and radial welding is completed; after a bottom clamping jaw instantly locks a shell, power is switched to a planet carrier, an outer mounting arm drives a driven scraping arm to grind the inner wall while axially moving, welding and grinding synchronization is achieved, a bidirectional pushing seat crank sliding block mechanism continuously rotates in a one-way mode to push and pull the furnace shell in a two-way mode, whole-circle accurate grinding is achieved during resetting, and six sets of air cylinder lead screw adjustable clamping jaws conduct internal and external synchronous supporting. The outer supporting cylinder is prevented from deformation, secondary clamping is not needed in the whole process, butt joint of multiple sections of furnace shells is completed at a time, continuous filling of a longitudinal weld bead can be completed when a circular seam is still in a high-temperature plastic stage through instantaneous switching of clamping and stopping, and the welding quality of a T-shaped connector area is improved.

Description

Technical Field

[0001] This invention relates to the field of furnace shell welding technology, specifically to a welding device for the shell of a gas-fired industrial furnace. Background Technology

[0002] The shell of a gas-fired industrial furnace is a core pressure-bearing component of a gas turbine or gas-fired boiler. It is typically made of chromium-molybdenum low-alloy heat-resistant steel plate and can withstand design pressures of over 3 MPa and operating temperatures exceeding 500 ℃. The shell has a cylindrical structure with an internal fire-resistant insulation layer and an outer wall covered with aluminum silicate insulation cotton. This reduces heat loss and ensures that the external surface temperature meets safety standards. The manufacturing process involves multiple steps, including material preparation, plate rolling, welding, heat treatment, and hydrostatic testing. The finished product must undergo both X-ray and ultrasonic testing to ensure excellent sealing and creep resistance under long-term operation at high temperature and high pressure.

[0003] When the diameter or length of a single furnace shell exceeds the transportation limit or the capacity limit of the factory's plate rolling machine or heat treatment furnace, it must be manufactured in sections and then welded together to form a complete shell. During on-site installation or later maintenance and replacement, due to limitations in hoisting ports, factory space, or transportation channels, it is impossible to bring in the whole shell. The furnace shell must be transported to the site in sections and then welded into a whole to ensure the feasibility of on-site assembly. This is a routine and critical process in the manufacturing of gas industrial furnace shells.

[0004] During the welding process of the furnace shell, the traditional method requires stopping the machine, manually loosening the chuck, and then re-clamping and positioning it, which takes several minutes. By this time, the temperature of the circumferential seam has dropped to room temperature, and the second arc ignition must be reheated. The high-temperature plastic overlap period is missed, and the T-joint is prone to "cold lap". It is easy to form incomplete fusion, arc crater and slag inclusion at the intersection, which will become thermal fatigue cracks in the furnace shell in the future.

[0005] In view of this, we propose a welding device for the shell of a gas-fired industrial furnace. Summary of the Invention

[0006] The purpose of this invention is to provide a welding device for the shell of a gas-fired industrial furnace, to solve the problem of "cold lap" at the T-joints when welding multiple furnace shell sections into a complete shell as described in the background art. To achieve the above objective, this invention provides the following technical solution: a welding device for the shell of a gas-fired industrial furnace, comprising a machine tool base, a welding mounting seat slidably connected to the top surface of the machine tool base, a welding torch mounting seat fixedly connected to the top surface of the machine tool base, a welding drive source disposed on the inner surface of the welding mounting seat, a welding rotating disk disposed on the inner surface of the welding mounting seat, a welding clamping disk disposed on the outer surface of the welding rotating disk, bottom grippers disposed on the inner surface of the welding mounting seat, and a bidirectional push seat disposed on the top surface of the machine tool base.

[0007] Preferably, the top surface of the machine tool base is fixedly connected with symmetrically distributed limiting guide rails, the welding mounting seat is slidably connected to the top surface of the limiting guide rails, the outer surface of the welding mounting seat is provided with a welding mounting groove, the inner surface of the welding mounting seat is slidably connected with annularly distributed inner balls, the inner surface of the welding gun mounting seat is slidably connected with a linear moving column, and the outer surface of the linear moving column is engaged with a welding gun seat.

[0008] Preferably, the welding drive source includes a servo motor, which is fixedly connected to the outer surface of the welding mounting base. The output end of the servo motor is fixedly connected to an active dial, and a driven grooved wheel is engaged on the outer surface of the active dial. A sprocket is fixedly connected to one end of the driven grooved wheel, and a chain is sleeved on the outer surface of the sprocket.

[0009] Preferably, the output end of the servo motor extends through to the inner surface of the welding mounting base, and the active dial, driven groove wheel, and sprocket are all rotatably connected to the inner surface of the welding mounting base. There are two sprockets, located at the top and bottom respectively, and the chain and the two sprockets form a chain drive.

[0010] Preferably, the welding rotary disk includes an input shaft rotatably connected to a welding mounting base. One end of the input shaft is fixedly connected to a gear connecting groove, and a center wheel is engaged with the outer surface of the gear connecting groove. An outer mounting arm is rotatably connected to the outer surface of the input shaft, and symmetrically distributed driven wheels are rotatably connected to the inner surface of the outer mounting arm. An outer blind cylinder is fixedly connected to one end of the outer mounting arm, and symmetrically distributed driven scraping arms are fixedly connected to one end of the outer blind cylinder. A grinding groove is fixedly connected to the outer surface of the driven scraping arms. A rotating housing is rotatably connected to the inner surface of the welding mounting base, and elastic washers are fixedly connected to both ends of the rotating housing. An inner support is fixedly connected to the inner surface of the rotating housing, and an inner mounting cylinder is fixedly connected to the inner surface of the rotating housing. An internal gear ring groove is formed on the inner surface of the inner mounting cylinder.

[0011] Preferably, the central wheel meshes with both driven wheels on both sides, the outer mounting arm passes through the driven wheels, the elastic washer is made of rubber, the inner bracket is fixedly connected to the rotating housing and the inner mounting cylinder, the inner gear groove meshes with both driven wheels on both sides, and the outer surface of the rotating housing is slidably connected to the inner ball bearing.

[0012] Preferably, the welding clamping plate includes a driven turntable, which is fixedly connected to one end of the rotating housing. A control cylinder is fixedly connected to the inner surface of the driven turntable, and a roller mounting base is fixedly connected to the output end of the control cylinder. A contact gripper is fixedly connected to the outer surface of the roller mounting base, and a control motor is fixedly connected to the inner surface of the roller mounting base. An adjusting screw is fixedly connected to the output end of the control motor, and an outer support cylinder is fixedly connected to the top surface of the welding mounting base.

[0013] Preferably, the number of control cylinders on the driven turntable is six and they are arranged in a ring. The number of roller mounting seats on each control cylinder is two, and one of the roller mounting seats is threadedly connected to the adjusting screw.

[0014] Preferably, the bottom gripper includes a fixed base, which is fixedly connected to the inner surface of the welding mounting groove. An L-shaped block is rotatably connected to the outer surface of the fixed base. A hinged arm is rotatably connected to one end of the L-shaped block. A fixed gripper is fixedly connected to one end of the fixed base. A movable gripper is slidably connected to the other end of the fixed base. A drive rod is hinged to the bottom surface of the L-shaped block. An active pull arm is slidably connected to the inner surface of the drive rod. A limit slider is fixedly connected to the outer surface of the active pull arm.

[0015] Preferably, the L-shaped blocks are symmetrically distributed on both sides of the fixed base, the center of the top of the L-shaped blocks is the rotation center, and the L-shaped blocks on both sides are connected by a rotating shaft. The hinge arm on one side of the L-shaped block is connected to the movable gripper hinge, and the limiting slider is slidably connected to the inner surface of the drive rod.

[0016] Preferably, the bidirectional push base includes a push motor, which is fixedly connected to the top surface of the machine tool base. The output end of the push motor is fixedly connected to a drive crank, and the outer surface of the drive crank is rotatably connected to a driven push rod. The outer surface of the driven push rod is fixedly connected to symmetrically distributed push blocks, and the top surface of the machine tool base is slidably connected to a driven rack.

[0017] Preferably, the push block contacts the tooth groove of the driven rack, the driven rack is fixedly connected to the active pull arm, and the driven rack is slidably connected to the inner surface of the welded mounting groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the clamping and releasing of the rotating outer shell by the bottom gripper, combined with the automatic torque distribution of the central gear, driven gear, and internal gear groove in the planetary gear system, realizes the instantaneous switching between radial welding and axial welding without the need for an additional clutch or reversing mechanism. Moreover, the motor output is always supported by a structure, either to drive the furnace shell to rotate or to drive the furnace shell to grind, preventing the motor from being subjected to excessive load.

[0019] In this invention, the outer mounting arm and the driven scraper arm move axially synchronously with the welding mounting base. During the intermittent stop period of the active dial, the outer mounting arm reverses and returns to its original position under the action of gravity. This achieves segmented grinding during the short-distance axial welding process and completes the grinding of the entire inner wall during the long-distance reset. Grinding and welding are completed on the same disc, eliminating the need for an additional independent grinding device and avoiding structural redundancy and motion interference.

[0020] In this invention, by integrating the four functions of rotary drive, radial welding, axial movement, and inner wall grinding into the planetary gear system and rotating shell of the welding rotary disk, the thermal fatigue stress generated by repeated heating and cooling during the operation of the gas industrial furnace shell is achieved. Through the instantaneous switching of clamping and stopping, the longitudinal weld can be continuously filled while the circumferential seam is still in the high-temperature plastic stage, which refines the grains and eliminates the arc crater in the T-joint area, eliminates the risk of incomplete fusion of the cross weld, and prevents the furnace shell from cracking from the cross weld in subsequent high-temperature cycles, significantly improving the pressure bearing safety margin of the gas furnace shell. Attached Figure Description

[0021] Figure 1 This is a side view of the overall structure of the present invention; Figure 2 This is a left view of the overall structure of the present invention; Figure 3 This is a side view of the back structure of the present invention; Figure 4 This is a schematic diagram A of the internal structure of the present invention; Figure 5 This is a schematic diagram (B) of the internal structure of the present invention; Figure 6 This is a schematic diagram of the interoperability of the various components of the welding drive source of the present invention; Figure 7 This is a schematic diagram of the interlocking structure of the various components of the welding rotating disk of the present invention; Figure 8 This is a schematic diagram of the cooperative structure of the rotating outer shell, outer blind cylinder, and driven scraper arm of the present invention. Figure 9 This is a schematic diagram of the interlocking structure of the external mounting arm, driven wheel, and external blind cylinder of the present invention. Figure 10 This is a schematic diagram of the interlocking structure of the various components of the welding clamping disc of the present invention; Figure 11This is a schematic diagram of the interaction structure of the control cylinder, roller mounting base, and adjusting screw of the present invention. Figure 12 This is a schematic diagram of the interaction structure between the rotating outer shell and the fixed and movable grippers of the present invention; Figure 13 This is a schematic diagram of the interlocking structure of the various components of the bottom gripper of the present invention; Figure 14 This is a schematic diagram of the structure in which the fixed base, fixed gripper, and movable gripper of the present invention cooperate with each other. Figure 15 This is an exploded flowchart of the L-shaped block and hinged arm of the present invention; Figure 16 This is an exploded view of the bottom gripper process of the present invention; Figure 17 This is a schematic diagram of the structure in which the fixed base and the L-shaped block of the present invention cooperate with each other; Figure 18 For the present invention Figure 17 Enlarged view of point A in the middle; Figure 19 This is a schematic diagram of the interaction between the bidirectional push seat and the active pull arm of the present invention; Figure 20 This is an exploded flowchart A of the bidirectional drive seat of the present invention; Figure 21 This is an exploded flowchart (B) of the bidirectional drive seat of the present invention; Figure 22 This is a schematic diagram of the interaction between the welding torch holder and the outer support cylinder of the present invention; Figure 23 This is a schematic diagram of the furnace shell weld of the present invention.

[0022] In the diagram: 1. Machine tool base; 11. Limit guide rail; 2. Welding mounting seat; 21. Welding mounting groove; 22. Inner ball bearing; 3. Welding torch mounting seat; 31. Direct drive column; 32. Welding torch holder; 4. Welding drive source; 41. Servo motor; 42. Active dial; 421. Driven slotted wheel; 43. Sprocket; 431. Chain; 5. Welding rotary disk; 51. Input shaft; 511. Gear connecting groove; 52. Center wheel; 53. Outer mounting arm; 531. Driven wheel; 532. Outer blind cylinder; 533. Driven scraper arm; 5331. Grinding groove; 54. Rotating housing; 541. Elastic washer; 542. Inner ball bearing. 55. Bracket; 551. Inner mounting cylinder; 6. Internal gear ring groove; 6. Welded clamping plate; 61. Driven turntable; 62. Control cylinder; 63. Roller mounting seat; 631. Contact gripper; 64. Control motor; 641. Adjusting screw; 65. Outer support cylinder; 7. Bottom gripper; 71. Fixed base; 711. L-shaped block; 712. Hinge arm; 72. Fixed gripper; 73. Movable gripper; 74. Drive rod; 75. Active pull arm; 751. Limit slider; 8. Bidirectional push seat; 81. Push motor; 82. Active crank; 83. Driven push rod; 831. Push block; 84. Driven rack. Detailed Implementation

[0023] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 23 The present invention provides a technical solution: a welding device for the shell of a gas-fired industrial furnace, including a machine tool base 1, a welding mounting seat 2 slidably connected to the top surface of the machine tool base 1, a welding torch mounting seat 3 fixedly connected to the top surface of the machine tool base 1, a welding drive source 4 provided on the inner surface of the welding mounting seat 2, a welding rotating disk 5 provided on the inner surface of the welding mounting seat 2, a welding clamping disk 6 provided on the outer surface of the welding rotating disk 5, a bottom gripper 7 provided on the inner surface of the welding mounting seat 2, and a bidirectional push seat 8 provided on the top surface of the machine tool base 1.

[0025] The top surface of the machine tool base 1 is fixedly connected with symmetrically distributed limiting guide rails 11. The welding mounting seat 2 is slidably connected to the top surface of the limiting guide rails 11. The outer surface of the welding mounting seat 2 is provided with a welding mounting groove 21. The inner surface of the welding mounting seat 2 is slidably connected with annularly distributed inner balls 22. The inner surface of the welding gun mounting seat 3 is slidably connected with a linear column 31. The outer surface of the linear column 31 is engaged with a welding gun seat 32.

[0026] The welding mounting base 2 is used to install the welding furnace shell, and its movement path is controlled by the limit guide rail 11 to move on the top of the machine tool base 1. The welding torch mounting base 3 is used to install the welding torch seat 32 via the linear column 31. The linear column 31 can slide on the welding torch mounting base 3, but it cannot rotate due to the groove on the surface. However, the initial position of the welding torch seat 32 can be changed by sliding, so the welding torch on the welding torch seat 32 will not rotate or move. Welding is carried out by rotating and moving the furnace shell, and radial welding of multiple furnace shell connections and axial welding of the furnace shell itself are achieved at the same time.

[0027] The welding drive source 4 includes a servo motor 41, which is fixedly connected to the outer surface of the welding mounting base 2. The output end of the servo motor 41 is fixedly connected to an active dial 42, and a driven grooved wheel 421 is engaged on the outer surface of the active dial 42. A sprocket 43 is fixedly connected to one end of the driven grooved wheel 421, and a chain 431 is sleeved on the outer surface of the sprocket 43.

[0028] The output end of the servo motor 41 extends through to the inner surface of the welding mounting base 2. The active dial 42, the driven groove wheel 421, and the sprocket 43 are all rotatably connected to the inner surface of the welding mounting base 2. There are two sprockets 43, which are located at the top and bottom respectively. The chain 431 and the two sprockets 43 form a chain drive.

[0029] With the welding drive source 4 in place, the servo motor 41 is the power source that drives the furnace shell to rotate during the welding process. The servo motor 41 drives the active dial 42 to rotate through the drive shaft. During the rotation of the active dial 42, the driven groove wheel 421 is rotated. The active dial 42 is a sector gear with a toothed groove on only one side for meshing with the driven groove wheel 421. When the side without the toothed groove contacts the driven groove wheel 421, the driven groove wheel 421 does not rotate, thus intermittently driving the driven groove wheel 421 to rotate. Since the side without the toothed groove occupies half, the active dial 42 rotates twice to drive the driven groove wheel 421 to rotate. The time for the driven groove wheel 421 to rotate and the time for it to stop each occupy half of the working process. The intermittent rotation is transmitted upward to the welding turntable 5 via the driven groove wheel 421 through the sprocket 43 and chain 431, which is used to drive the welding turntable 5 to rotate.

[0030] The welding rotating disk 5 includes an input shaft 51, which is rotatably connected to the welding mounting base 2. One end of the input shaft 51 is fixedly connected to a gear connecting groove 511. A center wheel 52 is engaged with the outer surface of the gear connecting groove 511. An outer mounting arm 53 is rotatably connected to the outer surface of the input shaft 51. Symmetrically distributed driven wheels 531 are rotatably connected to the inner surface of the outer mounting arm 53. An outer blind cylinder 532 is fixedly connected to one end of the outer blind cylinder 532. Symmetrically distributed driven scraping arms 533 are fixedly connected to one end of the outer blind cylinder 532. A grinding groove 5331 is fixedly connected to the outer surface of the driven scraping arms 533. A rotating housing 54 is rotatably connected to the inner surface of the welding mounting base 2. Elastic washers 541 are fixedly connected to both ends of the rotating housing 54. An inner support 542 is fixedly connected to the inner surface of the rotating housing 54. An inner mounting cylinder 55 is fixedly connected to the inner surface of the rotating housing 54. An inner gear groove 551 is formed on the inner surface of the inner mounting cylinder 55.

[0031] The center wheel 52 meshes with the driven wheels 531 on both sides. The outer mounting arm 53 passes through the driven wheels 531. The elastic washer 541 is made of rubber. The inner bracket 542 is fixedly connected to the rotating housing 54 and the inner mounting cylinder 55. The inner gear groove 551 meshes with the driven wheels 531 on both sides. The outer surface of the rotating housing 54 is slidably connected to the inner ball 22.

[0032] By setting the welding rotating disk 5, the rotation of the rotating outer shell 54 is controlled, and the rotation can be switched between radial welding, axial welding and inner wall grinding. During use, the input rotating shaft 51 is driven by the sprocket 43 and the chain 431 to achieve intermittent rotation. The input shaft 51 directly drives the center wheel 52 to rotate through the gear connecting groove 511, which serves as the sun gear. The outer mounting arm 53 is rotatably connected to the input shaft 51 and does not directly follow the input shaft 51 to rotate. As a planet carrier, the driven wheel 531 is mounted on the outer mounting arm 53 and meshes with both the center wheel 52 and the internal gear ring groove 551. As a planet gear, the internal gear ring groove 551 is fixed to the rotating housing 54 through the inner bracket 542. The rotating housing 54 can rotate inside the welded mounting base 2 and converts sliding friction into rolling friction by contacting the inner ball 22, forming the outer gear ring part. The central wheel 52, outer mounting arm 53, driven wheel 531, and internal gear groove 551 form a planetary gear system. The outer mounting arm 53, which serves as the planet carrier, and the internal gear groove 551, which serves as the external gear ring, can both rotate freely, forming a two-degree-of-freedom differential gear system. The rotating outer shell 54 with the internal gear groove 551 and the welded mounting base 2 have rolling friction, resulting in low mechanical friction. The outer mounting arm 53 has a large load torque due to the installation of the outer blind cylinder 532 and the driven scraper arm 533. At this time, the resistance torque of the rotating outer shell 54 at the gear ring end is always much smaller than the resistance torque of the outer mounting arm 53 at the planetary carrier end. It is equivalent to the planetary carrier being fixed. When the central wheel 52 rotates, the position of the outer mounting arm 53 remains unchanged. The driven wheel 531, as the idler wheel between the central wheel 52 and the inner gear ring groove 551, rotates in place and transmits the rotation of the input shaft 51 to the rotating outer shell 54. At this time, the rotating outer shell 54 drives the welding clamping plate 6 and the furnace shell clamped on the surface to rotate, so that the welding torch on the welding torch holder 32 welds around the inner wall of the furnace shell in the radial direction, thereby performing radial welding on the edges of the two mating furnace shells. After a complete circumference of welding is completed, it needs to be moved axially to the next hinge point of the two furnace shells. At the same time, the rolled-up furnace shell also needs to be welded axially. When the bidirectional push seat 8 pushes or pulls the bottom clamp 7, the bottom clamp 7 will clamp the rotating outer shell 54. The elastic washers 541 on both sides of the rotating outer shell 54 increase the friction during clamping, which instantly increases the huge external torque for the rotating outer shell 54. At this time, the rotating outer shell 54 cannot rotate, which is used to change the angular momentum. At this time, most of the power input to the rotating shaft 51 flows to the outer mounting arm 53 of the planetary carrier, causing the outer mounting arm 53 to rotate. At this time, the furnace shell no longer rotates. During the axial movement, the welding torch welds the connection of the furnace shell itself. At this time, since the rotation is transferred to the outer mounting arm 53, the outer mounting arm 53 will drive the outer blind cylinder 532 and the driven scraper arm 533 to rotate, and the inner wall of the furnace shell will be polished through the grinding groove 5331 on the driven scraper arm 533. During the axial welding process, due to the short moving distance, the driven scraper arm 533 cannot complete a full circle and will not contact the axial welding point being welded. After a single axial welding is completed, the driven scraper arm 533 is in an unbalanced state. Since the active dial 42 intermittently moves the driven groove wheel 421, the active dial 42 and the driven groove wheel 421 are not engaged for half the time. At this time, the outer mounting arm 53 is reversed by gravity and the driven scraper arm 533 returns to the balanced state. After all furnace shell welding is completed, when the welding mounting base 2 is pushed back to its initial position, the long movement distance allows the driven scraper arm 533 to completely circle and grind inside the furnace shell.

[0033] The welding clamping plate 6 includes a driven turntable 61, which is fixedly connected to one end of the rotating housing 54. A control cylinder 62 is fixedly connected to the inner surface of the driven turntable 61. A roller mounting base 63 is fixedly connected to the output end of the control cylinder 62. A contact gripper 631 is fixedly connected to the outer surface of the roller mounting base 63. A control motor 64 is fixedly connected to the inner surface of the roller mounting base 63. An adjusting screw 641 is fixedly connected to the output end of the control motor 64. An outer support cylinder 65 is fixedly connected to the top surface of the welding mounting base 2.

[0034] There are six control cylinders 62 on the driven turntable 61, arranged in a ring. There are two roller mounting seats 63 on each control cylinder 62, and one of the roller mounting seats 63 is threadedly connected to the adjusting screw 641.

[0035] By setting the welding clamping plate 6, the furnace shell to be welded is simultaneously clamped and limited inside and out. During use, the driven turntable 61 is fixed to the rotating outer shell 54 and rotates accordingly. Six sets of clamps are installed in a ring on the rotating outer shell 54. Each set consists of a control cylinder 62 and a contact clamp 631. The inner and outer walls of the furnace shell are clamped between the two contact clamps 631 of each set of clamps, providing internal and external support. The outer support cylinder 65 is wrapped around the outside of the furnace shell to prevent the furnace shell from falling apart and to provide external support force. The control cylinder 62 pushes the roller mounting seat 63 to move, thereby controlling the outward support force from inside. The control motor 64 can drive the adjusting screw 641 to rotate, adjusting the distance between the two roller mounting seats 63 and the contact clamps 631 on their surfaces, and controlling the clamping force.

[0036] The bottom gripper 7 includes a fixed base 71, which is fixedly connected to the inner surface of the welding mounting groove 21. An L-shaped block 711 is rotatably connected to the outer surface of the fixed base 71. A hinge arm 712 is rotatably connected to one end of the L-shaped block 711. A fixed gripper 72 is fixedly connected to one end of the fixed base 71. A movable gripper 73 is slidably connected to the other end of the fixed base 71. A drive rod 74 is hinged to the bottom surface of the L-shaped block 711. An active pull arm 75 is slidably connected to the inner surface of the drive rod 74. A limit slider 751 is fixedly connected to the outer surface of the active pull arm 75.

[0037] L-shaped blocks 711 are symmetrically distributed on both sides of the fixed base 71. The center of the top of the L-shaped blocks 711 is the rotation center, and the two sides of the L-shaped blocks 711 are connected by a rotating shaft. The hinge arm 712 on one side of the L-shaped block 711 is hinged to the movable gripper 73, and the limiting slider 751 is slidably connected to the inner surface of the drive rod 74.

[0038] With the bottom clamp 7, the rotating outer shell 54 can be clamped during the pushing and pulling of the welding furnace shell. During use, the fixed base 71 is installed in the welding installation groove 21 and is located at the bottom of the rotating outer shell 54. The fixed clamp 72 and the movable clamp 73 on the fixed base 71 are located at the two ends of the rotating outer shell 54, and the fixed clamp 72 is fixed in position. The rotating outer shell 54 is clamped by moving the movable clamp 73 to reduce the gap. The top of the L-shaped block 711 is connected to the movable gripper 73 via the hinge arm 712. In the initial state, the top of the L-shaped block 711 is horizontal. At this time, the horizontal distance between the rotation center of the hinge arm 712 and the movable gripper 73 and the rotation center of the L-shaped block 711 is the longest, and the distance between the fixed gripper 72 and the movable gripper 73 is the largest, which is in the open state. When the top of the L-shaped block 711 rotates, regardless of the direction of rotation, the hinge arm 712 will be pulled closer to the rotation center. The horizontal distance between the hinge arm 712 and the rotation center of the L-shaped block 711 decreases, and the movable gripper 73 moves and approaches the fixed gripper 72, thereby clamping the rotating outer shell 54 with the fixed gripper 72 and the movable gripper 73. The bottom of the L-shaped block 711 is used to connect with the drive rod 74. Pushing and pulling the drive rod 74 will cause the L-shaped block 711 to rotate while pulling the bottom gripper 7 to move, so that the rotating outer shell 54 is clamped regardless of whether it is pushed or pulled. Since the drive rod 74 is hinged to the L-shaped block 711, the angle and position of the drive rod 74 will change when the L-shaped block 711 rotates. It is connected to the drive arm 75 through the limiting slider 751. The limiting slider 751 can move inside the drive rod 74 to adapt to different angles and positions of the drive rod 74. When the bottom clamp 7 is pushed or pulled, the welding mounting base 2 will also be pushed or pulled synchronously, thereby achieving axial displacement of the furnace shell.

[0039] The bidirectional push base 8 includes a push motor 81, which is fixedly connected to the top surface of the machine tool base 1. The output end of the push motor 81 is fixedly connected to a drive crank 82. The outer surface of the drive crank 82 is rotatably connected to a driven push rod 83. The outer surface of the driven push rod 83 is fixedly connected to symmetrically distributed push blocks 831. The top surface of the machine tool base 1 is slidably connected to a driven rack 84.

[0040] The push block 831 contacts the tooth groove of the driven rack 84, the driven rack 84 is fixedly connected to the active pull arm 75, and the driven rack 84 is slidably connected to the inner surface of the welded mounting groove 21.

[0041] By setting the bidirectional push seat 8, the direction of the push motor 81 remains unchanged. Only the position of the driven push rod 83 needs to be adjusted to control the pushing, pulling, and retraction. During use, when the furnace shell needs axial movement, the push motor 81 drives the drive crank 82 to rotate at a constant speed. The driven push rod 83 will then be pushed or pulled around the rotation center of the drive crank 82. However, the drive crank 82 and the driven push rod 83 are rotatably connected, and the driven push rod 83 will be downwards due to gravity, always keeping the push block 831 facing one direction. When the push block 831 contacts the driven rack 84, if this... When the driven push rod 83 is pushed forward by the driving crank 82 (the position of the push block 831 is in front), since the bottom of the driven push rod 83 is blocked by the driven rack 84 and cannot rotate further downward, the driven push rod 83 will push the driven rack 84 through the push block 831. As the driving crank 82 continues to rotate, it will pull the driven push rod 83. Due to the reaction force of the driven rack 84, it will be pushed upward. Since there is no obstruction above the driven push rod 83, the driven push rod 83 will tilt up and will not have any effect on the driven rack 84. In this way, every time the driving crank 82 rotates a full revolution, the driven push rod 83 will be subjected to two actions: pushing and pulling. Pushing causes the driven rack 84 to move, while pulling causes it to slide over the driven rack 84 without having any effect. The driven push rod 83 can rotate on the driving crank 82, and can rotate it to the other side, making the front and back reversed (with the position of pushing the locking block 831 as the front). At this time, when the driving crank 82 rotates, the driven push rod 83 will still be pushed and pulled by both sides, but in the opposite direction. The movement direction of the driven rack 84 is also opposite, thereby controlling the movement direction of the furnace shell. During the welding process, it moves a short distance in one direction for axial welding. After welding is completed, it moves a long distance in the opposite direction for resetting and grinding. Since the driven push rod 83 and the driven rack 84 are not actually connected, after the axial movement is completed, the driven rack 84 can slide on its own when it is not being pushed, so that the active pull arm 75 will not be under constant force. The L-shaped block 711 resets and separates the fixed gripper 72 from the movable gripper 73, and the rotating housing 54 rotates again.

[0042] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the machine tool base 1 and the welding mounting base 2 are an integral outer shell, with each component installed inside. The welding mounting base 2 is used to install the furnace shell and allows it to rotate and move. The welding torch mounting base 3 extends into the furnace shell to perform welding. In this embodiment, as Figure 6As shown, the active dial 42 is a sector gear with a tooth groove on only one side for meshing with the driven grooved wheel 421, thereby intermittently rotating the driven grooved wheel 421; In this embodiment, as Figure 7 As shown, the rotating outer shell 54 is the outer shell of the entire welding rotating disk 5. It can rotate inside the welding mounting base 2. An external power source is introduced through the input shaft 51 to control the rotation of the internal planetary gear system. In this embodiment, as Figure 8 , Figure 9 As shown, the welding rotating disk 5 drives the welding clamping disk 6 to rotate, and the driven scraper arm 533 for grinding extends to the outside of the welding clamping disk 6. In this embodiment, as Figure 10 , Figure 11 As shown, the welding clamping plate 6 controls the outward support force by pushing the roller mounting base 63 to move through the control cylinder 62, and controls the clamping force by adjusting the distance between the two roller mounting bases 63 and the contact jaws 631 on their surfaces through the control motor 64. In this embodiment, as Figure 12 As shown, the fixed jaw 72 and the movable jaw 73 on the fixed base 71 are located at both ends of the rotating housing 54, and clamping is achieved by adjusting the distance between them; In this embodiment, as Figure 13 , Figure 14 As shown, the fixed gripper 72 is fixed in position, and the movable gripper 73 is pulled by the L-shaped block 711 and the hinge arm 712 to reduce the gap and clamp. In this embodiment, as Figure 15 , Figure 16 As shown, the top horizontal block of the L-shaped block 711 rotates to adjust the distance of the hinge arm 712, thereby pulling the movable gripper 73. The upper figure shows that the range of motion provides a large angle for the L-shaped block 711. The dotted circle is the rotation center of the L-shaped block 711. The lower figure shows the actual situation. The fixed gripper 72 and the movable gripper 73 are relatively close to the two ends of the rotating housing 54, and clamping can be achieved with a small displacement. In this embodiment, as Figure 17 , Figure 18 As shown, the active pull arm 75 pulls the drive pull rod 74 through the limiting slider 751, and the limiting slider 751 is small in size and can slide inside the drive pull rod 74; In this embodiment, as Figure 19 , Figure 20 , Figure 21 As shown, when the motor 81 is driven to rotate, the driven push rod 83 pushes the driven rack 84 to move. When it is pulled, it slides from above. The direction of the swing angle of the driven push rod 83 determines the direction of pushing and pulling, and controls the direction of movement of the driven rack 84. In this embodiment, as Figure 22 , Figure 23As shown, the welding torch holder 32 does not need to move; welding is achieved by rotating the furnace shell via the welding mounting base 2. Figure 23 This refers to the location of axial and radial welds when welding multiple furnace shells.

[0043] The invention's usage and advantages: The gas-fired industrial furnace shell welding device operates as follows: like Figures 1 to 23 As shown, during use, the servo motor 41 intermittently moves the driven groove wheel 421 via the active dial 42, and transmits the motion to the input shaft 51 through the sprocket 43 and chain 431. The center wheel 52 rotates in place and drives the internal gear groove 551 through the driven wheel 531, so that the rotating housing 54 drives the welding clamping plate 6 and the furnace shell clamped by the contact claw 631 to rotate slowly together. The welding torch on the welding torch holder 32 does not rotate or move. The furnace shell rotates to complete the welding trajectory. The rotating housing 54 is supported by the rolling of the inner ball 22 and maintains low friction and stable rotation inside the welding mounting base 2. After one radial weld is completed, the drive motor 81 drives the active crank 82 to rotate. The driven push rod 83 pushes the driven rack 84 through the push block 831, causing the active pull arm 75 to drive the drive pull rod 74 to move. The L-shaped block 711 rotates accordingly and tightens the hinge arm 712, causing the fixed claw 72 and the movable claw 73 to clamp the rotating outer shell 54 and stop it from rotating. The power input to the rotating shaft 51 is directed to the outer mounting arm 53. The outer blind cylinder 532 and the driven scraper arm 533 move axially a short distance with the welding mounting seat 2. The welding torch welds along the axial weld seam of the furnace shell. At the same time, the grinding groove 5331 grinds the inner wall. When the active dial 42 rotates half a revolution, the outer mounting arm 53 is reversed and returned to its original position by gravity. After all axial welds are completed, the driven push rod 83 flips in the opposite direction, pushing the driven rack 84 to drive the welding mounting seat 2 to return to the initial position a long distance. During this period, the bottom clamp 7 remains clamped, the rotating outer shell 54 is still locked, and the outer mounting arm 53 continues to rotate so that the driven scraper arm 533 can completely circle the inner wall of the furnace shell to achieve full-circle grinding. After it is in place, the clamp is released, and the rotating outer shell 54 returns to the state of free rotation. After welding is completed, the control motor 64 drives the adjusting screw 641 to widen the distance between the two roller mounting seats 63, the contact gripper 631 releases the furnace shell, the control cylinder 62 retracts to make the gripper exit the inner cavity of the furnace shell, the outer support cylinder 65 releases the external limit and the finished furnace shell is lifted off the machine tool base 1, the welding mounting seat 2 slides back to its original position along the limit guide rail 11, all driving components return to zero, and the device waits for the next workpiece.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for the shell of a gas-fired industrial furnace, comprising a machine tool base (1), wherein a welding mounting seat (2) is slidably connected to the top surface of the machine tool base (1), and a welding torch mounting seat (3) is fixedly connected to the top surface of the machine tool base (1), characterized in that: The welding mounting base (2) is provided with a welding drive source (4) on its inner surface, a welding rotating disk (5) on its inner surface, a welding clamping disk (6) on its outer surface, a bottom clamping jaw (7) on its inner surface, and a bidirectional push seat (8) on the top surface of the machine tool base (1). The welding drive source (4) intermittently drives the welding rotating disk (5) to rotate, and the welding clamping disk (6) rotates synchronously with the welding rotating disk (5) to complete radial welding. The bidirectional push seat (8) pushes and pulls the welding mounting base (2) axially through the bottom clamping jaw (7). When the outer mounting arm (53) is clamped and stopped, it carries the welding rotating disk (5) to stop rotating and switches the rotation to the grinding part, so as to realize that axial welding and inner wall grinding are carried out in parallel.

2. The gas-fired industrial furnace shell welding device according to claim 1, characterized in that: The top surface of the machine tool base (1) is fixedly connected with symmetrically distributed limiting guide rails (11). The welding mounting seat (2) is slidably connected to the top surface of the limiting guide rails (11). The outer surface of the welding mounting seat (2) is provided with a welding mounting groove (21). The inner surface of the welding mounting seat (2) is slidably connected with annularly distributed inner balls (22). The inner surface of the welding gun mounting seat (3) is slidably connected with a linear column (31). The outer surface of the linear column (31) is engaged with a welding gun seat (32). When the welding mounting seat (2) slides on the limiting guide rails (11), the inner balls (22) roll into contact with the rotating outer shell (54). The welding gun seat (32) adjusts its radial position with the linear column (31) to keep the gap between the welding gun and the shell constant.

3. The gas-fired industrial furnace shell welding device according to claim 2, characterized in that: The welding drive source (4) includes a servo motor (41), which is fixedly connected to the outer surface of the welding mounting base (2). The output end of the servo motor (41) is fixedly connected to an active dial (42), and a driven grooved wheel (421) is engaged on the outer surface of the active dial (42). A sprocket (43) is fixedly connected to one end of the driven grooved wheel (421), and a chain (431) is sleeved on the outer surface of the sprocket (43). The active dial (42) rotates twice and moves the driven grooved wheel (421) once. The intermittent rotation is transmitted to the input shaft (51) through the sprocket (43) and the chain (431) to provide timed and angled rotation for radial welding.

4. The gas-fired industrial furnace shell welding device according to claim 3, characterized in that: The welding rotating disk (5) includes an input shaft (51), which is rotatably connected to the welding mounting base (2). One end of the input shaft (51) is fixedly connected to a gear connecting groove (511). A center wheel (52) is engaged with the outer surface of the gear connecting groove (511). An outer mounting arm (53) is rotatably connected to the outer surface of the input shaft (51). Symmetrically distributed driven wheels (531) are rotatably connected to the inner surface of the outer mounting arm (53). A rotating housing (54) is rotatably connected to the inner surface of the welding mounting base (2). The two ends of the rotating housing (54) are fixedly connected with elastic washers (541). The inner surface of the rotating housing (54) is fixedly connected with an inner bracket (542). The inner surface of the rotating housing (54) is fixedly connected with an inner mounting cylinder (55). The inner surface of the inner mounting cylinder (55) is provided with an inner gear groove (551). The center wheel (52) drives the inner gear groove (551) through the driven wheel (531) to make the rotating housing (54) rotate, thus completing the radial welding. After the bottom jaw (7) clamps the rotating housing (54), the center wheel (52) drives the outer mounting arm (53) to rotate, thus realizing the switching between axial welding and grinding.

5. The gas-fired industrial furnace shell welding device according to claim 4, characterized in that: One end of the outer mounting arm (53) is fixedly connected to an outer blind cylinder (532), and one end of the outer blind cylinder (532) is fixedly connected to a symmetrically distributed driven scraper arm (533). The outer surface of the driven scraper arm (533) is fixedly connected to a polishing groove (5331). When the outer mounting arm (53) rotates, the driven scraper arm (533) drives the polishing groove (5331) to polish the inner wall of the housing in real time, and the oxide layer is continuously cleaned throughout the axial movement.

6. The gas-fired industrial furnace shell welding device according to claim 5, characterized in that: The welding clamping plate (6) includes a driven turntable (61), which is fixedly connected to one end of the rotating housing (54). A control cylinder (62) is fixedly connected to the inner surface of the driven turntable (61). A roller mounting base (63) is fixedly connected to the output end of the control cylinder (62). A contact gripper (631) is fixedly connected to the outer surface of the roller mounting base (63). A control motor (64) is fixedly connected to the inner surface of the roller mounting base (63). An adjusting screw (641) is fixedly connected to the output end of the control motor (64). An outer support cylinder (65) is fixedly connected to the top surface of the welding mounting base (2). The control cylinder (62) pushes the contact gripper (631) to clamp the housing. The control motor (64) finely adjusts the clamping force through the adjusting screw (641). The outer support cylinder (65) restricts the outward expansion of the housing, ensuring that the roundness of the housing remains unchanged during radial and axial welding.

7. The welding device for the shell of a gas-fired industrial furnace according to claim 6, characterized in that: The bottom gripper (7) includes a fixed base (71), which is fixedly connected to the inner surface of the welding mounting groove (21). A fixed gripper (72) is fixedly connected to one end of the fixed base (71), and a movable gripper (73) is slidably connected to the other end of the fixed base (71). The fixed gripper (72) and the movable gripper (73) are synchronously retracted under the drive of the L-shaped block (711) to hold the elastic washers (541) at both ends of the rotating shell (54) and provide locking torque for axial welding.

8. The welding device for the shell of a gas-fired industrial furnace according to claim 7, characterized in that: An L-shaped block (711) is rotatably connected to the outer surface of the fixed base (71). A hinge arm (712) is rotatably connected to one end of the L-shaped block (711). A drive rod (74) is hinged to the bottom surface of the L-shaped block (711). An active pull arm (75) is slidably connected to the inner surface of the drive rod (74). A limit slider (751) is fixedly connected to the outer surface of the active pull arm (75). The drive rod (74) drives the L-shaped block (711) to rotate regardless of whether it is pushed or pulled. The hinge arm (712) synchronously pulls the fixed gripper (72) and the movable gripper (73) to complete clamping or releasing, realizing bidirectional locking by pushing or pulling.

9. The gas-fired industrial furnace shell welding device according to claim 8, characterized in that: The bidirectional push base (8) includes a push motor (81), which is fixedly connected to the top surface of the machine tool base (1). The output end of the push motor (81) is fixedly connected to an active crank (82). The outer surface of the active crank (82) is rotatably connected to a driven push rod (83). The outer surface of the driven push rod (83) is fixedly connected to symmetrically distributed push blocks (831). The top surface of the machine tool base (1) is slidably connected to a driven rack (84). When the active crank (82) rotates one revolution, it pushes the driven rack (84) once and returns it once through the driven push rod (83) and the push blocks (831). Changing the swing angle of the driven push rod (83) can reverse the direction and drive the welding mounting base (2) to perform short-distance axial welding feed and long-distance reset return.

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