Quick positioning and welding device for multiple smoke exhaust pipes of pressure boiler

Abstract

The invention relates to the technical field of rapid welding of smoke pipes, in particular to a rapid positioning and welding device for multiple rows of smoke pipes of a pressure boiler, which comprises a centering position control part connected with an external multi-shaft mechanical arm in a matched manner, and an annular welding driving mechanism is fixedly mounted at the bottom of the centering position control part; a multi-row pipe linkage mechanism is installed at the bottom of the girth welding driving mechanism, and the bottom of the multi-row pipe linkage mechanism is connected with a multi-pipe girth welding unit. The multi-pipe ring welding unit is used for moving to the position between the multiple rows of smoke pipes to be welded and the corresponding end covers in the working state and synchronously completing welding of the current ring joints of the smoke pipes and the end covers under the matching action of the ring welding driving mechanism and the multi-row pipe linkage mechanism. According to the multi-pipe girth welding unit, under the cooperation of the girth welding driving mechanism and the multi-row pipe linkage mechanism, the girth joints of the smoke pipes and the end covers can be welded synchronously, the welding efficiency is improved, and the welding seam quality and the welding strength are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of multiple smoke exhaust pipe rapid welding, in particular to a multiple smoke exhaust pipe rapid positioning welding device for a pressure boiler. Background Art

[0002] In power station pressure boilers, multiple parallel exhaust pipes are generally used to accurately connect with subsequent flues or equipment. By providing end covers with positioning holes or positioning grooves at the ends of the exhaust pipes, it can be ensured that each exhaust pipe is accurately in the designed position during welding, avoiding deviations that affect flue gas circulation and system performance.

[0003] In the traditional process, manual welding is generally used when welding each smoke tube and the boiler end cover separately. However, this manual welding method requires welders to operate the connection parts of the smoke tube and the boiler end cover one by one. Each welding point needs to go through multiple steps such as preparation, welding, and inspection. Especially when welding each smoke tube, it is necessary to frequently move the position and change the welding angle, which will consume a lot of time and lead to low overall welding efficiency. Therefore, the welding of this multi-row boiler smoke tube design has also been optimized in the prior art.

[0004] After searching, a boiler smoke tube welding device was disclosed in a patent with patent application number CN201921800896.6 and IPC classification number B23K37 / 02. The device mainly drives slide plate one to translate left and right along guide rail one through drive member one, and drives slide plate two to translate up and down along guide rail two through drive member two, so that the welding head can move stably to weld the smoke tube, and the stability is improved by the counterweight block and positioning assembly on the connecting plate.

[0005] It can be seen that the above device has the following disadvantages when welding multiple exhaust pipes and boiler end covers:

[0006] First, because only one smoke pipe can be welded at a time, for the welding task of multiple smoke pipes and boiler end covers, the welding head needs to be moved frequently. It moves from one end of a smoke pipe to the other end, and then moves to the next smoke pipe. The moving distance is long and it takes a lot of time.

[0007] Second, after each smoke pipe is welded, the welding head needs to move to the welding position of the next smoke pipe. This process is an idle stroke, without actual welding operation. Due to the large number of multi-row smoke pipes, the number of idle strokes is frequent. In actual welding operations, the idle stroke time may account for 30%-50% of the total operation time, greatly reducing the welding efficiency.

[0008] Based on this, the present invention designs a pressure boiler multiple smoke exhaust pipe rapid positioning welding device capable of realizing multiple pipe synchronous annular welding, so as to better solve the problems existing in the prior art. Summary of the invention

[0009] The present invention is to solve one of the above-mentioned technical problems, and the technical scheme adopted is: a device for rapid positioning and welding of multiple smoke exhaust pipes of a pressure boiler, comprising a centering control part matched with an external multi-axis mechanical arm, a ring welding drive mechanism is fixedly installed at the bottom of the centering control part, a multi-row tube linkage mechanism is installed at the bottom of the ring welding drive mechanism, a multi-tube ring welding unit is connected to the bottom of the multi-row tube linkage mechanism, the multi-tube ring welding unit is used to shift to between the multiple smoke exhaust pipes to be welded and the corresponding end covers in a working state, and synchronously complete the welding of the annular joints of the current smoke tubes and the end covers under the cooperation of the ring welding drive mechanism and the multi-row tube linkage mechanism, the bottom of each smoke tube to be welded is fixedly inserted into the inside of the constraint riser on the top of the corresponding positioning platform below it; a solder diversion and conveying unit is installed between the multi-row tube linkage mechanism and the ring welding drive mechanism, and each discharge end of the solder diversion and conveying unit is respectively connected to each feed end of the multi-tube ring welding unit.

[0010] In any of the above schemes, it is preferred that the centering control component includes a high-torque rotary alignment motor vertically arranged and fixedly mounted on the moving end of an external multi-axis robotic arm, and the ring welding drive mechanism is fixedly mounted at the bottom of the motor shaft of the rotary alignment motor.

[0011] In any of the above schemes, it is preferred that the ring welding drive mechanism includes a main motor frame fixedly mounted on the bottom of the motor shaft of the rotating alignment motor, a main drive motor is fixedly mounted inside the main motor frame, the bottom of the main motor frame is fixedly mounted on the top of the solder diversion and conveying unit, the lower end of the output shaft of the main drive motor is connected to the power spindle tube at the center top of the multi-row tube linkage mechanism, and the power spindle tube of the multi-row tube linkage mechanism moves from bottom to top and seals through the center hole of the solder diversion and conveying unit and extends above it.

[0012] In any of the above schemes, it is preferred that the multi-row tube linkage mechanism includes a pulley box fixedly installed at the bottom of the solder diversion and conveying unit, a plurality of multi-groove passive pulleys are arranged at intervals in an array inside the mounting circular cavity of the pulley box, a multi-groove driving pulley is arranged at the center of the mounting circular cavity, the multi-groove driving pulley and each of the multi-groove passive pulleys and two adjacent multi-groove passive pulleys are connected by corresponding protective belts, the power spindle tube is fixedly inserted in the center of the multi-groove driving pulley, and the A box end cover is fixedly installed on the top of the box body, and a plurality of through holes coaxially arranged with the central axes of the corresponding multi-groove passive pulleys and the power spindle tube of the multi-groove driving pulley are arranged in an array on the top of the box end cover and the bottom of the pulley box body. Both ends of the power spindle tube of the multi-groove driving pulley pass through the corresponding through holes and movably extend to the top and lower part of the installation circular cavity, and the upper and lower ends of the pulley secondary shaft tube fixedly connected to the center of each multi-groove passive pulley movably pass through the corresponding through holes and movably extend to the top and lower part of the installation circular cavity.

[0013] In any of the above schemes, it is preferred that the top of the power spindle tube is sealed and the interior is hollow, the interior of each of the pulley auxiliary shaft tubes is hollow and through-connected from top to bottom, the top of each of the pulley auxiliary shaft tubes is movable and sealed to extend into the interior of the solder diversion and conveying unit, the top of each of the power spindle tubes is movable and sealed to pass through the center of the solder diversion and conveying unit and extend above it to be connected to the output shaft of the main drive motor, and on the outer side wall of the power spindle tube inside the solder diversion and conveying unit, a number of central suction ports are evenly spaced along its circumference to connect its inner cavity with the interior of the solder diversion and conveying unit.

[0014] In any of the above schemes, it is preferred that a sealing inner baffle is installed at the lower part of the inner cavity of the power main shaft tube and the lower part of the inner cavity of each of the pulley auxiliary shaft tubes, and the sealing inner baffle divides the corresponding inner cavity into a powder conveying channel located at the upper part and a surrounding constraint channel located at the lower part, the top of each of the powder conveying channels is connected to the interior of the solder diversion and conveying unit, the lower end of each of the surrounding constraint channels is connected to the outside, the lower end of each of the surrounding constraint channels is used to be sleeved on the upper end outer wall of the smoke pipe at its corresponding position and the gap between the two is matched, a reserved gap is provided between the bottom of each of the surrounding constraint channels and the top of the corresponding end cover to be welded, and each of the powder conveying channels is fixedly connected to each feed port of the multi-tube ring welding unit and the two are internally connected.

[0015] In any of the above schemes, preferably, a negative pressure powder metering pump is installed inside each of the powder conveying channels.

[0016] In any of the above schemes, it is preferred that the multi-tube ring welding unit includes two pneumatic nozzles relatively fixedly arranged on the outer wall of the power spindle tube or the pulley auxiliary shaft tube, and when in operation, the lower end spray port of each pneumatic nozzle is inclined toward the annular joint, and the feed port of each pneumatic nozzle is connected to the interior of the powder conveying channel at its corresponding position. When in operation, the negative pressure powder metering pump inside the powder conveying channel quantitatively conveys metal powder solder to the pneumatic nozzle; a miniature welding gun is arranged on one side of each pneumatic nozzle, and the upper part of each miniature welding gun is fixedly arranged on the outer wall of the power spindle tube or the outer wall of the pulley auxiliary shaft tube at its corresponding position, and when in operation, the working end of each miniature welding gun is ignited toward the metal powder solder in the annular weld position and completely melts it.

[0017] In any of the above schemes, it is preferred that the routing of the micro welding gun is completed inside the powder conveying channel or through a preset cavity between the powder conveying channel and the power main shaft tube and the pulley secondary shaft tube, so as not to affect the normal rotation of each component and prevent routing interference.

[0018] In any of the above schemes, preferably, the solder diversion and conveying unit includes a fixedly installed storage bin body, a powder storage cavity is arranged inside the storage bin body, the top of the storage bin body is fixedly installed on the bottom of the main motor frame, the bottom of the storage bin body is fixed to the top of the box end cover of the multi-row tube linkage mechanism, and a central positioning hole is arranged in the center of the storage bin body for the active seal of the power spindle tube on the multi-row tube linkage mechanism to pass through, and powder feeding pipes are symmetrically arranged on the top of the storage bin body on both sides of the central positioning hole, and the powder feeding pipes are connected through the outer The belt pump pipeline is connected to the external pneumatic feeding equipment, and the corresponding power main shaft tube or the pulley auxiliary shaft tube is movably and sealingly inserted in the mounting hole at the bottom of each storage bin body. The upper part of the powder conveying channel of the power main shaft tube is connected with the powder storage cavity through each central suction port evenly spaced on the upper outer wall thereof, and the top of the powder conveying channel of each pulley auxiliary shaft tube is connected with the interior of the powder storage cavity; under the action of negative pressure suction, the metal powder solder accumulated in the powder storage cavity is quantitatively conveyed to the pneumatic nozzle along the powder conveying channel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention cooperates with the existing multi-axis robotic arm to move precisely in the X-axis, Y-axis, and Z-axis directions, so that each power main shaft tube and pulley auxiliary shaft tube of the multi-tube ring welding unit can be quickly and accurately aligned with the corresponding smoke tube center axis. The high-torque rotation alignment motor of the centering control part is quickly adjusted during positioning to ensure accurate welding position. This precise positioning provides a basis for subsequent welding. With the cooperation of the ring welding drive mechanism and the multi-row tube linkage mechanism, the multi-tube ring welding unit can synchronously weld the annular joints of each smoke tube and the end cover. Compared with traditional single-tube welding, it greatly improves welding efficiency, reduces welding errors, and ensures weld quality and welding strength.

[0021] 2. The multi-row tube linkage mechanism, solder conveying and welding parts of multi-tube girth welding work together to improve the overall efficiency of multi-ring girth welding; the solder diversion and conveying unit receives, stores and accurately diverts and conveys metal powder solder through negative pressure suction and negative pressure powder metering pump, and quantitatively conveys the solder to the pneumatic nozzle of the multi-tube girth welding unit. The girth welding drive mechanism drives the multi-row tube linkage mechanism to operate, so that the pneumatic nozzle and micro welding gun in the multi-tube girth welding unit rotate around the fixed axis of the smoke pipe, the pneumatic nozzle sprays material, and the micro welding gun welds. The close cooperation of various parts optimizes the welding process, improves the overall performance of the equipment, and enhances the adaptability and versatility of the equipment to welding smoke pipes of different specifications.

[0022] 3. The main drive motor of the ring welding drive mechanism is directly connected to the power spindle tube of the multi-row tube linkage mechanism to efficiently transmit power. The multi-groove driving pulley, multi-groove passive pulley and protective belt of the multi-row tube linkage mechanism work together to transmit power to each pulley sub-axis tube, driving each group of pneumatic nozzles and micro-spray guns of the multi-tube ring welding unit to rotate stably. The power spindle tube and pulley sub-axis tube not only transmit power but also transport solder, making the structure more compact and reasonable.

[0023] 4. The storage bin of the solder diversion and conveying unit is connected to the power spindle tube and the pulley countershaft tube in a movable and sealed manner through the central positioning hole and the mounting hole. The central suction port of the power spindle tube and the top of the pulley countershaft tube are connected to the powder storage chamber. Under the action of negative pressure, the solder enters the powder conveying channel; the negative pressure powder metering pump in the channel accurately controls the amount of solder and adjusts the conveying speed according to different welding requirements. When the power spindle tube and the pulley countershaft tube rotate, the solder is quantitatively conveyed to the pneumatic nozzle of the multi-tube ring welding unit to ensure that each welding point obtains an appropriate amount of solder, avoids waste, and improves the consistency of welding quality.

[0024] 5. The surrounding constraint channel at the bottom of the power main shaft tube and the pulley auxiliary shaft tube is matched with the gap of the outer wall of the upper end of the smoke pipe, and there is a reserved gap between the bottom and the top of the end cover. This design makes the surrounding constraint channel not only play a positioning and restraining role for the pneumatic nozzle and micro welding gun to rotate around the smoke pipe, ensuring the stable position of the smoke pipe, pneumatic nozzle and micro welding gun during welding, reducing position deviation caused by vibration or external force interference, and improving welding position accuracy; it also guides the solder coming from the powder conveying channel to accurately reach the annular joint between the smoke pipe and the end cover through the reserved gap, and cooperates with the micro welding gun to achieve precise welding.

[0025] 6. The multiple pneumatic nozzles and micro welding guns of the multi-tube ring welding unit are respectively fixed on the outer wall of the corresponding power main shaft tube or pulley auxiliary shaft tube, and can rotate synchronously around the outer periphery of the smoke pipe under its drive. The spray port at the lower end of the pneumatic nozzle is tilted toward the annular seam, and the metal powder solder is accurately sprayed to the welding part under the action of the negative pressure powder metering pump. The working end of the micro welding gun accurately ignites and melts the solder. Multiple nozzles and welding guns work at the same time, continuously performing solder spraying and welding operations. Compared with traditional single-tube welding, the welding efficiency is greatly improved and the welding time is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the use state of the pressure boiler multiple smoke exhaust pipe rapid positioning welding device of the present invention.

[0028] Figure 2 It is a schematic diagram of the main structure of the pressure boiler multiple smoke exhaust pipe rapid positioning welding device in use state of the present invention.

[0029] Figure 3 It is a three-dimensional structural schematic diagram of the pressure boiler multiple smoke exhaust pipe rapid positioning welding device from the first perspective of the present invention.

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the pressure boiler multiple smoke exhaust pipe rapid positioning welding device from a second viewing angle of the present invention.

[0031] Figure 5 It is a bottom view structural schematic diagram of the installation state of the internal protection belt of the multi-row pipe linkage mechanism of the present invention.

[0032] Figure 6 It is a top structural schematic diagram of the installation state of the internal protection belt of the multi-row pipe linkage mechanism of the present invention.

[0033] Figure 7 It is a three-dimensional structural schematic diagram of the installation state of the internal protection belt of the multi-row pipe linkage mechanism of the present invention.

[0034] Figure 8 It is a schematic diagram showing the internal structure of the multi-row tube linkage mechanism of the present invention and the internal connection components thereunder.

[0035] Fig. 9 It is a schematic structural diagram of the power spindle tube of the present invention and the components installed thereon.

[0036] Fig.10 for Fig. 9 Schematic diagram of the partial internal cross-sectional structure.

[0037] Fig.11 It is a schematic diagram of the partial internal cross-sectional structure of the pulley countershaft tube and the components installed thereon of the present invention.

[0038] Fig.12 It is a schematic diagram of the three-dimensional structure of the pulley box of the present invention.

[0039] Fig.13 It is a schematic diagram showing the three-dimensional internal structure of the storage bin body of the present invention.

[0040] In the figure, 1. positioning platform; 2. restraint riser; 3. solder diversion and conveying unit; 4. rotating alignment motor; 5. main motor frame; 6. total drive motor; 7. pulley box; 8. multi-groove passive pulley; 9. multi-groove driving pulley; 10. protective belt; 11. power spindle tube; 12. box end cover; 13. pulley secondary shaft tube; 14. center suction port; 15. sealing inner partition; 16. powder conveying channel; 17. surrounding restraint channel; 18. negative pressure powder metering pump; 19. pneumatic nozzle; 20. micro welding gun; 21. storage silo; 22. powder storage cavity; 23. center positioning hole; 24. powder feed pipe; 25. smoke pipe, 26 end cover; 27 annular seam; 28. installation circular cavity. DETAILED DESCRIPTION

[0041] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 13 as shown in .

[0042] Embodiment 1: A device for rapid positioning and welding of multiple smoke pipes of a pressure boiler, comprising a centering control member matched with an external multi-axis robotic arm, a ring welding drive mechanism fixedly installed at the bottom of the centering control member, a multi-row tube linkage mechanism installed at the bottom of the ring welding drive mechanism, a multi-tube ring welding unit connected to the bottom of the multi-row tube linkage mechanism, the multi-tube ring welding unit is used to shift to between the multiple smoke pipes 25 to be welded and the corresponding end covers 26 in a working state and synchronously complete the welding of the annular joints 27 of each current smoke pipe 25 and the end cover 26 under the cooperation of the ring welding drive mechanism and the multi-row tube linkage mechanism, the bottom of each smoke pipe 25 to be welded is fixedly inserted into the inside of the restraining riser 2 on the top of the corresponding positioning platform 1 below it; a solder diversion and conveying unit 3 is installed between the multi-row tube linkage mechanism and the ring welding drive mechanism, and each discharge end of the solder diversion and conveying unit 3 is respectively connected to each feed end of the multi-tube ring welding unit.

[0043] The solder splitting and conveying unit 3 is used to cooperate with an external pneumatic feeding device in a working state to quantitatively convey powdered solder to the feeding end of the multi-tube ring welding unit.

[0044] The pressure boiler multi-exhaust pipe quick positioning welding device designed in the present invention is directly installed on the moving end of an external multi-axis robotic arm during installation. Under the action of the multi-axis robotic arm, the accuracy and smoothness of the entire device when moving along the X-axis, Y-axis, and Z-axis can be guaranteed; in addition, during installation, it is necessary to connect the various electrical equipment of the device to the external distribution box, and connect the powder feed pipe 24 at the top of the solder diversion and conveying unit 3 in the device to the external pneumatic feeding equipment through an external pump pipeline. After checking that all components are connected, wait for the device to start.

[0045] When welding is required, an external multi-axis robotic arm is used to control the movement of the entire device into position. When shifting, the configured in-position switch is used to control the alignment of each welding working end of the multi-tube ring welding unit of the entire device with the central axis of each corresponding smoke tube 25, and a device in-position reminder is issued. Driven by the multi-axis robotic arm, the entire multi-tube ring welding unit is controlled to move along the central axis of each corresponding smoke tube 25. During the movement, the pneumatic nozzles 19 and the micro welding gun 20 of the multi-tube ring welding unit gradually move downward and approach the annular seam 27 at the docking position of the current smoke tube 25 and the through hole of the end cover 26, so that an appropriate gap is reserved between the bottom discharge port of the pneumatic nozzle 19 and the annular seam 27.

[0046] When plasma welding is adopted and metal powder solder is used, the distance between the micro welding gun 20 and the welding part (the annular joint 27 between the smoke tube 25 and the end cover 26) is generally 3-8 mm.

[0047] Welding current and plasma gas flow velocity: When the current is large and the flow velocity is high, the plasma arc has high energy and strong impact force. The micro welding gun 20 needs to be kept away from the joint, with a distance of 6-8 mm.

[0048] For example, when welding a thick-walled smoke pipe 25 and an end cover 26, when the current reaches 150-300A and the plasma gas flow velocity is relatively high, appropriately increasing the distance can avoid problems such as weld burn-through and overheating caused by excessive energy concentration.

[0049] If the current is between 30-100A, the plasma gas flow speed is moderate, and the distance is controlled at 4-6 mm, the arc stability and sufficient heat transfer can be ensured, so that the metal powder solder can be evenly melted and well integrated with the base material.

[0050] Considering the current thickness and material of the smoke pipe 25 weldment and the end cover 26 weldment: the weldment is thick, the heat dissipation is fast, and more heat is needed. The micro welding gun 20 is close to the joint, 3-5 mm is appropriate. For example, the carbon steel smoke pipe 25 and the end cover 26 with a thickness of 5-10 mm, closer can ensure sufficient heat input to allow the metal powder to fully melt and fill the weld.

[0051] Considering the characteristics of metal powder solder: metal powder with fine particles and low melting point is easy to melt, the distance of the micro welding gun 20 can be slightly farther, 5-7 mm. Because of its fast melting speed, too close distance can easily lead to excessive melting and splashing of powder, affecting the welding quality. If the metal powder particles are coarse and the melting point is high, more heat is required, and the micro welding gun 20 is close to the seam, preferably 4-6 mm, to ensure that the powder can be fully melted and combined with the parent material. The specific operation and control shall be carried out reasonably by technicians in this field, and appropriate in-place switches shall be configured to detect the in-place position.

[0052] When the entire pressure boiler multi-exhaust smoke pipe rapid positioning welding device is working, the tops of the various smoke pipes 25 to be welded at the bottom are pre-threaded and installed in the corresponding threaded through holes of the end cover 26 to be welded, and it is ensured that the top of each smoke pipe 25 extends to the top of the end cover 26 by a length of 50mm-100mm. The assembled smoke pipes 25 are kept vertically hoisted by hoisting equipment, and the bottoms are respectively fitted and inserted into the inside of the restraint riser 2 on the top of the corresponding positioning platform 1. In order to maintain the stability of the entire multi-exhaust smoke pipe 25, it can also be additionally positioned according to positioning needs. After the smoke pipes 25 to be welded and the end covers 26 are installed in place, they are controlled to wait for welding operations.

[0053] When the device is working, it controls the external pneumatic feeding equipment to work, which can quickly pneumatically convey the metal powder solder used for welding to the interior of the solder diversion and conveying unit 3 as needed. After the metal powder solder enters the interior of the current solder diversion and conveying unit 3, it will continue to be diverted and conveyed to the interior of the corresponding multi-tube ring welding unit under the action of negative pressure diversion and conveying, and will be diverted to the corresponding annular seams 27 at the corresponding positions of each smoke tube 25 to be welded.

[0054] While the solder is being fed to the annular weld 27, the annular welding drive mechanism is controlled to operate and drive the multi-row tube linkage mechanism to operate. When the multi-row tube linkage mechanism operates, it can synchronously drive each pneumatic nozzle 19 inside the current multi-tube annular welding unit to spray outward at an appropriate pressure and speed.

[0055] During the solder spraying process, the micro-welding gun 20 on one side of the pneumatic nozzle 19 keeps rotating around the outer fixed axis of the current coaxial smoke tube 25. At the same time, the micro-welding gun 20 on the side of the pneumatic nozzle 19 rotates around the outer fixed axis of the current coaxial smoke tube 25 and quickly and high-temperature welds the metal powder solder falling on the annular joint 27 during the rotation, thereby realizing the rapid melting of the solder and the base material to form an annular weld. Controlling the number of rotations can effectively control the number of ring weldings to ensure the quality of the welding weld and the strength of the welding.

[0056] In addition, it should be noted that during the welding process, the feed amount and uniformity of the metal powder solder should be reasonably controlled, and the feed speed, pressure, flow rate and other parameters should be reasonably controlled to ensure the relative concentration of the solder at the annular joint 27, so as to avoid and reduce the occurrence of the solder blowing around.

[0057] In any of the above schemes, it is preferred that the centering control component includes a high-torque rotary alignment motor 4 that is vertically arranged and fixedly mounted on the moving end of an external multi-axis robotic arm, and the ring welding drive mechanism is fixedly mounted at the bottom of the motor shaft of the rotary alignment motor 4.

[0058] The centering control part adopts a large torque rotation alignment motor 4, which is vertically installed at the moving end of the multi-axis robot arm, providing a flexible rotation function for the entire welding device. The rotation alignment motor 4 can drive the ring welding drive mechanism, the multi-row tube linkage mechanism, the solder diversion and conveying unit 3, and the multi-tube ring welding unit to follow the rotation, thereby achieving a rapid adjustment when the multi-tube ring welding unit and each smoke tube 25 are fully aligned and positioned.

[0059] In any of the above schemes, it is preferred that the ring welding drive mechanism includes a main motor frame 5 fixedly mounted on the bottom of the motor shaft of the rotating alignment motor 4, a total drive motor 6 is fixedly mounted inside the main motor frame 5, the bottom of the main motor frame 5 is fixedly mounted on the top of the solder diversion and conveying unit 3, the lower end of the output shaft of the total drive motor 6 is connected to the power spindle tube 11 at the center top of the multi-row tube linkage mechanism, and the power spindle tube 11 of the multi-row tube linkage mechanism moves from bottom to top and seals through the center hole of the solder diversion and conveying unit 3 and extends above it.

[0060] When the ring welding drive mechanism is working, by controlling the rotation of the total drive motor 6, the power main shaft tube 11 of the multi-row tube linkage mechanism can be driven to rotate, and then the power is transmitted to the inside of the multi-row tube linkage mechanism. Under the joint action of the various belt transmission components inside the multi-row tube linkage mechanism, the various pneumatic nozzles 19 and micro spray guns 20 on the multi-tube ring welding unit can be driven to rotate around the periphery of the smoke tube 25 at their respective positions, thereby completing the ring welding operation of the ring seam 27 of each smoke tube 25 and the end cover 26 after coordinating with pneumatic feeding and plasma welding power supply.

[0061] The power main shaft tube 11 of the multi-row tube linkage mechanism is directly connected to the main drive motor 6, and the power is efficiently transmitted to the inside of the multi-row tube linkage mechanism. The belt transmission components inside the multi-row tube linkage mechanism work together to ensure the stable rotation of the pneumatic nozzle 19 and the micro spray gun 20 on the multi-tube ring welding unit. This transmission method ensures the stability of power transmission and the good synchronization of the rotation of each component, thereby ensuring the quality of the ring welding operation and reducing the jitter and deviation during the welding process.

[0062] In any of the above schemes, it is preferred that the multi-row tube linkage mechanism includes a pulley box 7 fixedly installed at the bottom of the solder diversion and conveying unit 3, a plurality of multi-groove passive pulleys 8 are arranged at intervals in an array inside the mounting circular cavity 28 of the pulley box 7, a multi-groove driving pulley 9 is arranged at the center of the mounting circular cavity 28, the multi-groove driving pulley 9 and each of the multi-groove passive pulleys 8 and two adjacent multi-groove passive pulleys 8 are connected by corresponding protective belts 10, the power spindle tube 11 is fixedly inserted in the center of the multi-groove driving pulley 9, and the multi-groove driving pulley 9 is fixedly installed in the pulley box. A box end cover 12 is fixedly installed on the top of 7, and a plurality of through holes coaxially arranged with the central axes of the corresponding multi-groove passive pulleys 8 and the power main shaft tube 11 of the multi-groove driving pulley 9 are arranged in an array on the top of the box end cover 12 and the bottom of the pulley box 7. Both ends of the power main shaft tube 11 of the multi-groove driving pulley 9 pass through the corresponding through holes and movably extend to the top and lower part of the installation circular cavity 28, and the upper and lower ends of the pulley secondary shaft tube 13 fixedly connected to the center of each multi-groove passive pulley 8 movably pass through the corresponding through holes and movably extend to the top and lower part of the installation circular cavity 28.

[0063] The main function of the multi-row tube linkage mechanism is to transmit power from the power main shaft tube 11 to each pulley secondary shaft tube 13 under the cooperation of the multi-groove driving pulley 9, each multi-groove passive pulley 8 and each protective belt 10, thereby driving the pneumatic nozzle 19 and the micro spray gun 20 on the multi-tube ring welding unit connected to the pulley secondary shaft tube 13 to move synchronously around the corresponding pulley secondary shaft tube 13 respectively. At the same time, the power main shaft tube 11 itself will also drive the pneumatic nozzle 19 and the micro spray gun 20 installed thereon to rotate. The specific process is as follows:

[0064] The power of the total drive motor 6 is transmitted to the multi-groove driving pulley 9 through the power main shaft tube 11, and the multi-groove driving pulley 9 transmits the power to the surrounding multi-groove passive pulley 8 through the protective belt 10, thereby driving the pulley countershaft tube 13 connected to the multi-groove passive pulley 8 to rotate. Since the pulley countershaft tube 13 is connected to the pneumatic nozzle 19 and the micro-spray gun 20 to be driven, the multiple pneumatic nozzles 19 and the micro-spray gun 20 are finally rotated as needed, and the movement around the outer side wall of the corresponding smoke pipe 25 is completed.

[0065] In any of the above schemes, it is preferred that the top of the power spindle tube 11 is sealed and the interior is hollow, the interior of each pulley auxiliary shaft tube 13 is hollow and through-set from top to bottom, the top of each pulley auxiliary shaft tube 13 is movable and sealed to extend to the interior of the solder diversion and conveying unit 3, the top of each power spindle tube 11 is movable and sealed to pass through the center of the solder diversion and conveying unit 3 and extend above it to be connected to the output shaft of the main drive motor 6, and on the outer side wall of the power spindle tube 11 inside the solder diversion and conveying unit 3, a number of central suction ports 14 are evenly spaced along its circumference to connect its inner cavity with the interior of the solder diversion and conveying unit 3.

[0066] During operation, the top of the power spindle tube 11 is connected to the output shaft of the main drive motor 6. When the main drive motor 6 starts to run, the output shaft drives the power spindle tube 11 to rotate. Since the power spindle tube 11 is fixedly inserted in the center of the multi-groove drive pulley 9, the rotation of the power spindle tube 11 will drive the multi-groove drive pulley 9 to rotate. The multi-groove drive pulley 9 transmits power to the multi-groove driven pulley 8 through the protective belt 10, and then drives the pulley countershaft tube 13 connected to the multi-groove driven pulley 8 to rotate, and finally realizes the operation of the entire multi-row tube linkage mechanism, driving the pneumatic nozzle 19 and micro spray gun 20 of the multi-tube ring welding unit to perform ring welding operations.

[0067] The power spindle tube 11 not only transmits the power of the main drive motor 6, but also serves as one of the channels for solder delivery, integrating the two functions of power transmission and solder delivery into one component, making the structure of the entire mechanism more compact, reducing additional components and space occupancy, and reducing the complexity and cost of the equipment.

[0068] The central suction port 14 on the outer wall of the power spindle tube 11 is evenly spaced along the circumference, so that the solder can enter the inner cavity of the power spindle tube 11 evenly from all directions, ensuring that the solder can be more evenly distributed after entering the power spindle tube 11.

[0069] In any of the above schemes, it is preferred that a blocking inner baffle 15 is installed at the lower part of the inner cavity of the power main shaft tube 11 and the lower part of the inner cavity of each of the pulley secondary shaft tubes 13, and the blocking inner baffle 15 divides the corresponding inner cavity into a powder conveying channel 16 located at the upper part and a surrounding constraint channel 17 located at the lower part, the top of each of the powder conveying channels 16 is connected to the interior of the solder diversion and conveying unit 3, the lower end of each of the surrounding constraint channels 17 is connected to the outside, the lower end of each of the surrounding constraint channels 17 is used to be sleeved on the upper end outer wall of the smoke pipe 25 at its corresponding position and the gap between the two is matched, a reserved gap is set between the bottom of each of the surrounding constraint channels 17 and the top of the corresponding end cover 26 to be welded, and each of the powder conveying channels 16 is fixedly connected to each feed port of the multi-tube ring welding unit and the two are internally connected.

[0070] The upper part of the power spindle tube 11 and the pulley countershaft tube 13 is blocked by the inner partition 15 to separate the powder delivery channel 16, and the top of the channel is connected to the inside of the solder diversion and delivery unit 3. When the solder enters through the central suction port 14 of the power spindle tube 11, it will flow in the powder delivery channel 16 and be evenly delivered to each feed port of the multi-tube ring welding unit according to the layout and pressure distribution of each channel, providing a stable supply of metal powder solder for subsequent welding operations.

[0071] The surrounding constraint channel 17 at the lower part is matched with the gap of the outer wall of the upper end of the smoke tube 25, and there is a reserved gap between the bottom and the top of the end cover 26 to be welded. The solder delivered from the powder delivery channel 16 will enter the inside of the feed pipe of the corresponding pneumatic nozzle 19, and the pneumatic nozzle 19 surrounds the outside of the smoke tube 25. Under the action of pneumatic feeding, the solder in the pneumatic nozzle 19 can be quickly passed through the reserved gap and accurately reach the annular joint 27 of the smoke tube 25 and the end cover 26, ensuring that the solder can act accurately on the welding point.

[0072] The lower end of the surrounding constraint channel 17 is sleeved on the outer side wall of the upper end of the smoke pipe 25, which plays a role in positioning and constraining the pneumatic nozzle 19 and the micro welding gun 20 when they rotate around the smoke pipe 25. It can ensure that the smoke pipe 25, the pneumatic nozzle 19, and the micro welding gun 20 are in a relatively stable position during the welding process, reduce the position deviation caused by vibration or external force interference, make the welding position more accurate, and improve the welding quality.

[0073] The solder in the powder conveying channel 16 enters the feeding pipe of the pneumatic nozzle 19, and the pneumatic nozzle 19 surrounds the smoke tube 25. Under the action of pneumatic feeding, the solder passes through the reserved gap and accurately reaches the annular joint 27 between the smoke tube 25 and the end cover 26, and cooperates with the plasma welding of the micro welding gun 20 to achieve annular welding.

[0074] In any of the above solutions, preferably, a negative pressure powder metering pump 18 is installed inside each of the powder conveying channels 16 .

[0075] The negative pressure powder metering pump 18 can form a negative pressure environment in the powder delivery channel 16. Under the action of this negative pressure, the metal powder solder located in the solder diversion and delivery unit 3 can enter the powder delivery channel 16 more smoothly through the central suction port 14 of the power spindle tube 11, and flow along the channel to each feed port of the multi-tube ring welding unit, providing continuous and stable power for the delivery of the solder, ensuring that the solder can reach the welding position in time. The negative pressure powder metering pump 18 can accurately control the amount of metal powder solder entering the powder delivery channel 16. Through precise adjustment of the pump, the amount of solder delivered each time can be accurately set according to different welding needs and process requirements, ensuring that each welding point can obtain an appropriate amount of solder, avoiding too much or too little solder. In the actual delivery process, the negative pressure powder metering pump 18 can adjust its working parameters to change the negative pressure and flow rate in the powder delivery channel 16. This enables the operator to flexibly adjust the solder delivery speed according to the actual welding progress and process requirements to adapt to different welding scenarios, such as welding of smoke tubes 25 of different diameters, requirements for different welding speeds, etc. The working parameters of the negative pressure powder metering pump 18 can be quickly adjusted according to different welding tasks and process requirements to achieve flexible control of the solder delivery volume and speed. This enables the equipment to adapt to the welding needs of smoke tubes 25 of various specifications and types, improves the flexibility and adaptability of production, and reduces the equipment adjustment cost and time when changing product specifications.

[0076] Embodiment 2: Compared with Embodiment 1, this embodiment is different in that it also includes the following technical features:

[0077] The multi-tube ring welding unit includes two pneumatic nozzles 19 relatively fixedly arranged on the outer wall of the power spindle tube 11 or the pulley auxiliary shaft tube 13. When working, the lower end spray port of each pneumatic nozzle 19 is inclined toward the annular joint 27, and the feed port of each pneumatic nozzle 19 is connected to the interior of the powder conveying channel 16 at its corresponding position. When working, the negative pressure powder metering pump 18 inside the powder conveying channel 16 quantitatively conveys metal powder solder to the pneumatic nozzle 19; a micro welding gun 20 is arranged on one side of each pneumatic nozzle 19, and the upper part of each micro welding gun 20 is fixedly arranged on the outer wall of the power spindle tube 11 or the outer wall of the pulley auxiliary shaft tube 13 at its corresponding position. When working, the working end of each micro welding gun 20 ignites the metal powder solder at the annular weld 27 and completely melts it.

[0078] The pneumatic nozzle 19 is relatively fixed on the outer wall of the power spindle tube 11 or the pulley countershaft tube 13, and its feed port is connected to the powder conveying channel 16. Under the action of the negative pressure powder metering pump 18, the metal powder solder is quantitatively conveyed to the inside of the pneumatic nozzle 19. During operation, the lower end spray port of the pneumatic nozzle 19 is inclined toward the annular joint 27, and the metal powder solder can be accurately sprayed to the annular joint 27 of the smoke pipe 25 and the end cover 26, providing the required filling material for welding. The micro welding gun 20 is arranged on one side of the pneumatic nozzle 19, and its upper part is fixed on the outer wall of the power spindle tube 11 or the pulley countershaft tube 13. After the metal powder solder is sprayed to the annular weld 27, the working end of the micro welding gun 20 is ignited toward these metal powder solders. The high temperature generated by the micro welding gun 20 can completely melt the metal powder solder at the annular weld 27, so that it can be fused with the parent material of the smoke pipe 25 and the end cover 26, thereby achieving the purpose of welding.

[0079] The pneumatic nozzle 19 and the micro welding gun 20 can be synchronously rotated around the outer periphery of the smoke tube 25 under the drive of the power main shaft tube 11 or the pulley auxiliary shaft tube 13. During the rotation process, the pneumatic nozzle 19 continuously sprays solder and the micro welding gun 20 continuously welds, and the two work together to complete the annular welding operation of the annular seam 27 of the smoke tube 25 and the end cover 26.

[0080] The advantages of the multi-tube ring welding unit structure are: achieving precise welding: the design of the pneumatic nozzle 19 tilted toward the annular joint 27 ensures that the metal powder solder can be accurately sprayed to the welding position, avoiding the waste and scattering of the solder. At the same time, the working end of the micro welding gun 20 is accurately facing the metal powder solder at the annular weld 27, which can achieve precise ignition and melting, ensuring the accuracy of the welding position and the stability of the welding quality.

[0081] Achieve efficient welding: Multiple pneumatic nozzles 19 and micro welding guns 20 in the multi-tube annular welding unit can work simultaneously, and can simultaneously weld the annular joints 27 between each smoke tube 25 and the end cover 26. Moreover, since the pneumatic nozzles 19 and micro welding guns 20 can rotate synchronously around the periphery of the smoke tube 25, the solder spraying and welding operations are continuously performed during the rotation process, which greatly improves the welding efficiency and shortens the welding time.

[0082] Realize quantitative control of solder: The setting of negative pressure powder metering pump 18 enables metal powder solder to be quantitatively delivered to pneumatic nozzle 19, ensuring uniform and appropriate solder supply for each welding point. This helps to avoid welding defects caused by too much or too little solder and improves the consistency of welding quality.

[0083] The overall structure is compact: the pneumatic nozzle 19 and the micro welding gun 20 are both fixed on the outer wall of the power main shaft tube 11 or the pulley countershaft tube 13. This structural design makes the multi-tube ring welding unit compact and occupies a small space. At the same time, the power main shaft tube 11 and the pulley countershaft tube 13, as transmission components, can not only drive the pneumatic nozzle 19 and the micro welding gun 20 to rotate, but also provide them with installation support, simplifying the structure of the equipment and reducing the cost and maintenance difficulty of the equipment.

[0084] In any of the above schemes, it is preferred that the routing of the micro welding gun 20 is completed inside the powder conveying channel 16 or through a preset cavity between the powder conveying channel 16 and the power main shaft tube 11 and the pulley secondary shaft tube 13, so as to achieve the purpose of not affecting the normal rotation of each component and preventing routing interference.

[0085] When the multi-tube ring welding unit is working, the power main shaft tube 11 and the pulley auxiliary shaft tube 13 will drive the pneumatic nozzle 19 and the micro welding gun 20 to rotate around the smoke tube 25. If the wiring is arranged outside, it is likely to rub and entangle with other components during the rotation process, hindering the rotation of the components. However, the wiring is set inside the powder conveying channel 16 or in the preset clamping cavity. The wiring rotates with the components and does not cause additional resistance or interference to the rotation, ensuring the smooth transmission of power and rotation. By hiding the wiring in the powder conveying channel 16 or the clamping cavity, it can effectively avoid collision and extrusion with other components, reduce the risk of failure caused by wiring interference, and ensure the stability and reliability of the entire welding system. For technicians in this field, hiding the wiring in the internal space reduces the exposure of the line to the outside, and reduces the risk of safety accidents such as electric shock caused by operators accidentally touching the line. At the same time, it also avoids the line from being damaged by external factors (such as dust, moisture, mechanical collision, etc.), extending the service life of the line. This wiring method is mainly to avoid affecting the normal rotation of each component and prevent wiring interference, ensuring the stable operation of the equipment. It should be noted that the core of the present invention is to realize the rapid positioning welding of multiple exhaust pipes, and the focus is on the collaborative innovative design of the multi-row pipe linkage mechanism, solder delivery, and welding. The routing method is based on the equipment operation requirements and adopts the existing known routing method to ensure the stable operation of the equipment, which is not the key improvement of the present invention.

[0086] In any of the above schemes, it is preferred that the solder diversion and conveying unit 3 includes a fixed storage bin body 21, a powder storage cavity 22 is arranged inside the storage bin body 21, the top of the storage bin body 21 is fixedly installed on the bottom of the main motor frame 5, the bottom of the storage bin body 21 is fixed on the top of the box end cover 12 of the multi-row tube linkage mechanism, and a central positioning hole 23 is arranged at the center of the storage bin body 21 for the power spindle tube 11 on the multi-row tube linkage mechanism to pass through the movable seal, and powder feeding pipes 24 are symmetrically arranged on the top of the storage bin body 21 on both sides of the central positioning hole 23, and the powder feeding pipes 24 are connected through the storage bin body 21. The external pump pipeline is connected to the external pneumatic feeding equipment, and the corresponding power main shaft tube 11 or the pulley auxiliary shaft tube 13 is movably and sealingly inserted in the mounting hole at the bottom of each storage bin 21. The upper part of the powder conveying channel 16 of the power main shaft tube 11 is connected to the powder storage cavity 22 through the central suction ports 14 evenly spaced on the upper outer wall thereof, and the top of the powder conveying channel 16 of each pulley auxiliary shaft tube 13 is connected to the interior of the powder storage cavity 22; under the action of negative pressure suction, the metal powder solder accumulated inside the powder storage cavity 22 is quantitatively conveyed along the powder conveying channel 16 to the pneumatic nozzle 19.

[0087] The top of the powder conveying channel 16 of the pulley secondary shaft tube 13 is directly opened, and is precisely connected with the opening at the corresponding position of the bottom of the storage bin body 21.

[0088] The solder diversion and conveying unit 3 is responsible for receiving, storing and accurately diverting and conveying metal powder solder in the entire pressure boiler multi-exhaust pipe rapid positioning welding device. Its working principle is closely related to the coordinated operation of various components, as follows:

[0089] Solder input link: The external pneumatic feeding device is connected to the powder feeding pipe 24 at the top of the solder diversion and conveying unit 3 through a pump pipeline. When the pneumatic feeding device is started, the pressure generated presses the metal powder solder into the powder feeding pipe 24 through the pump pipeline, and evenly transports it to the powder storage cavity 22 inside the storage bin 21, completing the initial storage of the solder.

[0090] A central positioning hole 23 is provided at the center of the storage bin body 21, and the power spindle tube 11 on the multi-row tube linkage mechanism is movably sealed to pass through the hole and extend to the top thereof, and the top of the power spindle tube 11 is blocked to limit the upward outflow of powder, so that it can only enter the interior thereof through the central suction port 14. Under the action of negative pressure suction, the metal powder solder in the powder storage cavity 22 enters the powder conveying channel 16 of the power spindle tube 11 through these central suction ports 14. At the same time, each pulley secondary shaft tube 13 is movably and sealably inserted into the mounting hole at the bottom of the storage bin body 21, and the top of its powder conveying channel 16 is directly connected to the interior of the powder storage cavity 22, and also receives solder under the action of negative pressure.

[0091] The powder conveying channel 16 of the power main shaft tube 11 and the pulley auxiliary shaft tube 13 not only undertakes the task of conveying the solder, but also is responsible for distributing the solder to the multi-tube ring welding unit.

[0092] After receiving the solder, the powder conveying channel 16 of the power main shaft tube 11 rotates with the rotation of the multi-groove driving pulley 9 because it is connected to the multi-groove driving pulley 9. The pulley secondary shaft tube 13 also rotates under the drive of the multi-groove passive pulley 8. During the rotation process, the solder inside the two is quantitatively conveyed to the pneumatic nozzle 19 of the connected multi-tube ring welding unit according to the regulation of the negative pressure powder metering pump 18.

[0093] The feed port of each pneumatic nozzle 19 is connected to the powder conveying channel 16. Finally, the metal powder solder enters the pneumatic nozzle 19 from the powder conveying channel 16 under the pressure difference generated by the negative pressure powder metering pump 18 and the guidance of the conveying channel 16, providing sufficient solder supply for the subsequent welding operation at the annular joint 27 between the smoke pipe 25 and the end cover 26.

[0094] The method steps for welding the annular joint 27 between each smoke tube 25 and the end cover 26 by using the device are as follows:

[0095] Step 1: Equipment preparation and positioning: Equipment startup and parameter setting: Turn on the power of the entire pressure boiler multi-exhaust pipe rapid positioning welding device, start the external pneumatic feeding equipment, the total drive motor 6 and the matching multi-axis robotic arm control system.

[0096] According to the specifications, materials and welding requirements of the smoke pipe 25 to be welded, the delivery volume and delivery speed of the negative pressure powder metering pump 18, the rotation speed of the main drive motor 6, the movement parameters of the multi-axis robot arm, etc. are set.

[0097] Multi-axis robot positioning: under the command of the control system, the multi-axis robot drives the entire welding device to move in the X-axis, Y-axis and Z-axis directions, and monitors the position information in real time through the in-position switch, so that the multi-tube ring welding unit gradually approaches each smoke tube 25 to be welded.

[0098] The high torque rotation alignment motor 4 of the centering control part is started to adjust the angle and position of the multi-tube ring welding unit to ensure that the pneumatic nozzles 19 and the micro welding guns 20 of the multi-tube ring welding unit are accurately aligned with the annular seam 27 of the smoke tube 25 and the end cover 26 to achieve precise centering positioning.

[0099] Surrounding constraint channel socketing: The surrounding constraint channel 17 at the lower part of the power main shaft tube 11 and the pulley auxiliary shaft tube 13 is accurately socketed on the upper outer wall of the corresponding smoke tube 25, and maintains a clearance fit with the smoke tube 25, while ensuring a preset gap between the bottom of the surrounding constraint channel 17 and the top of the end cover 26 to be welded.

[0100] Step 2: Solder transportation and preparation, solder input and storage: The external pneumatic feeding equipment transports the metal powder solder to the powder feed pipe 24 of the solder diversion and conveying unit 3 through a pipeline with a pump.

[0101] The metal powder solder enters the powder storage cavity 22 inside the storage bin body 21 through the powder feed pipe 24 to complete the storage of the solder.

[0102] Solder diversion and transportation: Under the action of negative pressure suction, the metal powder solder in the powder storage chamber 22 enters the powder conveying channel 16 of the power spindle tube 11 through the central suction port 14 on the upper outer wall of the power spindle tube 11, and also enters the powder conveying channel 16 through the top of the pulley auxiliary shaft tube 13.

[0103] The negative pressure powder metering pump 18 in each powder delivery channel 16 starts to work, and quantitatively delivers the metal powder solder to the inside of the feed pipe of the corresponding pneumatic nozzle 19 according to the preset parameters.

[0104] Step 3: Welding operation is executed, power is transmitted and components rotate: the main drive motor 6 is started, and its output shaft drives the power spindle tube 11 to rotate, and the power spindle tube 11 drives the multi-groove drive pulley 9 fixed thereto to rotate.

[0105] The multi-groove driving pulley 9 transmits power to the multi-groove passive pulleys 8 distributed in the surrounding array through the protective belt 10, thereby driving the pulley countershaft tubes 13 to rotate.

[0106] The rotation of the power main shaft tube 11 and the pulley auxiliary shaft tube 13 drives the pneumatic nozzle 19 and the micro welding gun 20 connected thereto to rotate synchronously around the outer periphery of the corresponding smoke pipe 25 .

[0107] Solder spraying and welding: During the rotation process, the spray port at the lower end of the pneumatic nozzle 19 is tilted toward the annular joint 27 between the smoke pipe 25 and the end cover 26, and the metal powder solder is accurately sprayed to the annular joint 27.

[0108] The working end of the micro welding gun 20 is ignited toward the metal powder solder at the annular weld 27, generating high temperature to completely melt the metal powder solder, causing it to fuse with the parent materials of the smoke tube 25 and the end cover 26, completing the welding operation.

[0109] Completion and ending of welding: As the power main shaft tube 11 and the pulley auxiliary shaft tube 13 continue to rotate, the pneumatic nozzle 19 continues to spray material, and the micro welding gun 20 continues to weld until the entire annular welding operation of the annular seam 27 of the smoke tube 25 and the end cover 26 is completed.

[0110] After welding is completed, the main drive motor 6, the negative pressure powder metering pump 18, the external pneumatic feeding equipment and the control system of the multi-axis robot are turned off in sequence, the device is removed, and the welded parts are subjected to quality inspection and subsequent processing.

[0111] In summary, the pressure boiler multi-exhaust pipe rapid positioning welding device of the present invention moves accurately to the welding position under the drive of the multi-axis mechanical arm, and the multi-tube ring welding unit simultaneously welds each ring seam 27 of each smoke pipe 25 and the end cover 26. The whole process is efficient, accurate, stable, and has significant advantages. The specific action working process and advantages are as follows:

[0112] Installation and preparation stage: Install the device on the mobile end of the external multi-axis robot arm, connect each electrical equipment to the distribution box, and connect the solder diversion and conveying unit 3 to the external pneumatic feeding equipment. At the same time, screw the smoke pipe 25 into the threaded through hole of the end cover 26, extend it 50-100mm, and then use the lifting equipment to lift it vertically and insert it into the restraint riser 2 of the positioning platform 1. This installation method uses a multi-axis robot arm to ensure the accuracy and smoothness of the device movement, and greatly improves the positioning efficiency and accuracy compared to manual positioning. The installation method of the smoke pipe 25 and the end cover 26 and the use of the positioning platform 1 ensure the stability of the weldment during the welding process, laying the foundation for high-quality welding.

[0113] Positioning stage: The multi-axis robot arm drives the device to move, and when the welding working end of the multi-tube ring welding unit is aligned with the central axis of the smoke tube 25, the in-position switch issues a reminder. This precise positioning method allows the welding device to quickly and accurately reach the welding position, reduces adjustment time, improves production efficiency, and ensures the accuracy of the welding position, avoiding welding defects caused by positioning deviation.

[0114] Solder conveying stage: the external pneumatic feeding equipment conveys the metal powder solder to the solder diversion and conveying unit 3, which diverts the solder quantitatively to the multi-tube ring welding unit under the action of negative pressure and delivers it to the ring joint 27 of each smoke tube 25. This process realizes the precise quantitative conveying of solder, ensuring that each welding point can obtain the right amount of solder, which not only avoids solder waste, but also ensures the consistency of welding quality, and is more uniform and efficient than manual feeding.

[0115] Welding stage: The ring welding drive mechanism operates, driving the multi-row tube linkage mechanism, and then the pneumatic nozzle 19 and the micro welding gun 20 in the multi-tube ring welding unit rotate around the outer periphery of the smoke tube 25. The pneumatic nozzle 19 sprays material at an appropriate pressure and speed, and the micro welding gun 20 welds the solder that falls on the ring joint 27. The distance between the micro welding gun 20 and the joint is adjusted between 3-8 mm according to various factors. This multi-tube synchronous welding method greatly improves the welding efficiency compared with the traditional single-tube welding. Accurate welding distance control and stable rotation welding process ensure welding quality, reduce welding defects, and improve weld strength and aesthetics.

[0116] Welding parameter control stage: During the welding process, the feeding amount, speed, pressure and flow rate of the metal powder solder are reasonably controlled. This ensures that the solder is concentrated at the annular joint 27 and reduces the situation of blowing around, which not only improves the utilization rate of the solder, but also avoids pollution to the working environment and ensures the stability and consistency of the welding process.

[0117] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0118] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A pressure boiler multiple exhaust pipe rapid positioning welding device, including a centering control part, characterized in that: A ring welding drive mechanism is fixedly installed at the bottom of the centering control member, and a multi-row tube linkage mechanism is installed at the bottom of the ring welding drive mechanism. The bottom of the multi-row tube linkage mechanism is connected to a multi-tube ring welding unit, and the multi-tube ring welding unit is used to shift between each smoke tube to be welded and the corresponding end cover and synchronously complete the ring seam welding of each current smoke tube and the end cover under the cooperation of the ring welding drive mechanism and the multi-row tube linkage mechanism. The bottom of each smoke tube is fixedly inserted inside the restraining riser on the top of the corresponding positioning platform below it; a solder diversion and conveying unit is installed between the multi-row tube linkage mechanism and the ring welding drive mechanism, and each discharge end of the solder diversion and conveying unit is respectively connected to each feed end of the multi-tube ring welding unit.

2. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 1, characterized in that: The centering control component includes a large-torque rotary alignment motor that is vertically arranged and fixedly mounted on the moving end of an external multi-axis robotic arm, and the ring welding drive mechanism is fixedly mounted on the bottom of the motor shaft of the rotary alignment motor.

3. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 2, characterized in that: The ring welding drive mechanism includes a main motor frame fixedly installed at the bottom of the motor shaft of the rotating alignment motor, a main drive motor is fixedly installed inside the main motor frame, the bottom of the main motor frame is fixedly installed on the top of the solder diversion and conveying unit, the lower end of the output shaft of the main drive motor is connected to the power spindle tube at the center top of the multi-row tube linkage mechanism, the power spindle tube of the multi-row tube linkage mechanism moves from bottom to top and seals through the center hole of the solder diversion and conveying unit and extends above it.

4. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 3, characterized in that: The multi-row tube linkage mechanism includes a pulley box body fixedly installed at the bottom of the solder diversion and conveying unit, a plurality of multi-groove passive pulleys are arranged at intervals in an array inside the mounting circular cavity of the pulley box body, a multi-groove driving pulley is arranged in the center of the mounting circular cavity, the multi-groove driving pulley and each of the multi-groove passive pulleys and two adjacent multi-groove passive pulleys are connected by corresponding protective belts, the power spindle tube is fixedly inserted in the center of the multi-groove driving pulley, a box end cover is fixedly installed on the top of the pulley box body, a plurality of through holes coaxially arranged with the central axes of the corresponding multi-groove passive pulleys and the power spindle tube of the multi-groove driving pulley are arranged in an array on the top of the box end cover and the bottom of the pulley box body, both ends of the power spindle tube of the multi-groove driving pulley pass through the corresponding through holes and movably extend to the top and the bottom of the mounting circular cavity, and the upper and lower ends of the pulley secondary shaft tube fixedly connected to the center of each of the multi-groove passive pulleys movably pass through the corresponding through holes and movably extend to the top and the bottom of the mounting circular cavity.

5. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 4, characterized in that: The top of the power spindle tube is sealed and the interior is hollow, the interior of each pulley auxiliary shaft tube is hollow and through-through, the top of each pulley auxiliary shaft tube is movable and sealed to extend to the interior of the solder diversion and conveying unit, the top of each power spindle tube is movable and sealed to pass through the center of the solder diversion and conveying unit and extend above it to be connected to the output shaft of the main drive motor, and a number of center suction ports are evenly spaced along the circumference of the outer side wall of the power spindle tube inside the solder diversion and conveying unit.

6. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 5, characterized in that: The lower part of the inner cavity of the power main shaft tube and the lower part of the inner cavity of each of the pulley auxiliary shaft tubes are installed with a blocking inner partition, and the blocking inner partition divides the corresponding inner cavity into a powder conveying channel located at the upper part and a surrounding constraint channel located at the lower part, the top of each of the powder conveying channels is connected to the interior of the solder diversion and conveying unit, the lower end of each of the surrounding constraint channels is connected to the outside, the lower end of each of the surrounding constraint channels is used to be sleeved on the upper end outer wall of the smoke pipe at its corresponding position and the gap between the two is matched, a reserved gap is set between the bottom of each of the surrounding constraint channels and the top of the corresponding end cover to be welded, and each of the powder conveying channels is fixedly connected to each feed port of the multi-tube ring welding unit and the two are internally connected.

7. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 6, characterized in that: A negative pressure powder metering pump is installed inside each of the powder conveying channels.

8. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 7, characterized in that: The multi-tube ring welding unit includes two pneumatic nozzles relatively fixedly arranged on the outer wall of the power spindle tube or the pulley auxiliary shaft tube, the lower end spray port of each pneumatic nozzle is inclined toward the annular joint, the feed port of each pneumatic nozzle is connected to the interior of the powder conveying channel at its corresponding position, and the negative pressure powder metering pump inside the powder conveying channel quantitatively conveys metal powder solder to the pneumatic nozzle; a miniature welding gun is arranged on one side of each pneumatic nozzle, and the upper part of each miniature welding gun is fixedly arranged on the outer wall of the power spindle tube or the outer wall of the pulley auxiliary shaft tube at its corresponding position, and the working end of each miniature welding gun is ignited toward the metal powder solder at the annular weld position and completely melts it.

9. A pressure boiler multiple exhaust pipe rapid positioning welding device according to claim 8, characterized in that: The solder diversion and conveying unit includes a fixed storage bin body, a powder storage cavity is arranged inside the storage bin body, the top of the storage bin body is fixedly mounted on the bottom of the main motor frame, the bottom of the storage bin body is fixed to the top of the box end cover of the multi-row tube linkage mechanism, a central positioning hole is arranged at the center of the storage bin body for the active seal of the power spindle tube on the multi-row tube linkage mechanism to pass through, and powder feed pipes are symmetrically arranged on the top of the storage bin body on both sides of the central positioning hole, and the powder feed pipes are connected to the main motor frame through an external pump pipeline. The hopper is connected to an external pneumatic feeding device, and the corresponding power main shaft tube or the pulley auxiliary shaft tube is movably and sealingly inserted in the mounting hole at the bottom of each storage bin body. The upper part of the powder conveying channel of the power main shaft tube is connected with the powder storage cavity through each central suction port evenly spaced on the upper outer wall thereof, and the top of the powder conveying channel of each pulley auxiliary shaft tube is connected with the interior of the powder storage cavity. Under the action of negative pressure suction, the metal powder solder accumulated in the powder storage cavity is quantitatively conveyed to the pneumatic nozzle along the powder conveying channel.

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