A rapid positioning welding device for multiple smoke exhaust pipes of a pressure boiler

Abstract

The present invention relates to the technical field of rapid welding of smoke tubes, and in particular to a rapid positioning welding device for multiple smoke tubes of a pressure boiler, comprising a centering control part matched with an external multi-axis mechanical arm, a ring welding drive mechanism fixedly installed at the bottom of the centering control part, 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, and the multi-tube ring welding unit is used to shift between the multiple smoke tubes to be welded and the corresponding end covers in a working state and synchronously complete the welding of the annular joints 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 multi-tube ring welding unit of the present invention can synchronously weld the annular joints of each smoke tube and the end cover under the cooperation of the ring welding drive mechanism and the multi-row tube linkage mechanism, thereby improving welding efficiency and ensuring weld quality and welding strength.

Description

Technical Field

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

[0002] In a power station pressure boiler, multiple parallel exhaust pipes are generally used to accurately dock with subsequent flue ducts or equipment. By providing end caps 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 flow and system performance.

[0003] In traditional processes, manual welding is generally used when welding each exhaust pipe to the boiler end cap part. However, this manual welding method requires welders to operate on the connection parts of the exhaust pipes and the boiler end cap one by one. For each welding point completed, multiple steps such as preparation, welding, and inspection are required. Especially when welding each exhaust pipe, it is necessary to frequently move positions and change the welding angle, which consumes a large amount of time and results in low overall welding efficiency. Therefore, in the prior art, the welding of boiler exhaust pipes with this multi-row design has also been optimized.

[0004] After retrieval, in the patent with the patent application number CN201921800896.6 and the IPC classification number B23K37 / 02, a boiler exhaust pipe welding device is disclosed. It mainly drives the first slide plate to move left and right along the first guide rail by the first driving member, and drives the second slide plate to move up and down along the second guide rail by the second driving member, so that the welding head can stably move to weld the exhaust pipe, and the stability is improved by the counterweight block and the positioning component on the connecting plate.

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

[0006] First, since only one exhaust pipe can be welded at a time, for the welding task of multiple exhaust pipes to the boiler end cap, the welding head needs to move frequently. Moving from one end of an exhaust pipe to the other end and then to the next exhaust pipe, the moving distance is long and the time consumed is much.

[0007] Second, after each exhaust pipe is welded, the welding head needs to move to the welding position of the next exhaust pipe. This process is an idle stroke and there is no actual welding operation. Due to the large number of multiple exhaust 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 rapid positioning welding device for multiple exhaust pipes of a pressure boiler that can achieve synchronous circular welding of multiple pipes 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] Preferably, in any of the above solutions, the multi-row pipe linkage mechanism includes a pulley box body fixedly installed at the bottom of the solder diversion and conveying unit. Inside the installation circular cavity of the pulley box body, a number of multi-groove passive belt pulleys are arranged at intervals in an array. A multi-groove driving belt pulley is arranged at the center of the installation circular cavity. The multi-groove driving belt pulley and each of the multi-groove passive belt pulleys, and between two adjacent multi-groove passive belt pulleys, are cooperatively connected through corresponding protective belts. A power main shaft pipe is fixedly inserted at the center of the multi-groove driving belt pulley. A box end cover is fixedly installed on the top of the pulley box body. On the top of the box end cover and the bottom of the pulley box body, a number of through holes are arranged in an array and are coaxially arranged with the central shafts of the corresponding multi-groove passive belt pulleys and the power main shaft pipe of the multi-groove driving belt pulley. Both ends of the power main shaft pipe of the multi-groove driving belt pulley pass through the corresponding through holes and extend out of the installation circular cavity to the top and bottom. The upper and lower ends of the belt pulley sub-shaft pipes fixedly connected to the centers of the multi-groove passive belt pulleys all pass through the corresponding through holes and extend out of the installation circular cavity to the top and bottom.

[0013] Preferably, in any of the above solutions, the top of the power main shaft pipe is sealed and its interior is hollow. The interiors of the belt pulley sub-shaft pipes are hollow and vertically through. The tops of the belt pulley sub-shaft pipes extend into the interior of the solder diversion and conveying unit movably and sealingly. The top of the power main shaft pipe passes through the center of the solder diversion and conveying unit movably and sealingly and extends above it and is connected to the output shaft of the main driving motor. On the outer side wall of the power main shaft pipe inside the solder diversion and conveying unit, a number of central suction ports are evenly spaced along its circumference and communicate its inner cavity with the interior of the solder diversion and conveying unit.

[0014] Preferably, in any of the above solutions, a sealing inner partition is installed in the lower part of the inner cavity of the power main shaft pipe and the lower part of the inner cavity of each belt pulley sub-shaft pipe. The sealing inner partition divides the corresponding inner cavity into a powder conveying channel in the upper part and a surrounding constraint channel in the lower part. The tops of the powder conveying channels are all connected to the interior of the solder diversion and conveying unit. The lower ends of the surrounding constraint channels all communicate with the outside. The lower ends of the surrounding constraint channels are all used for sleeving on the outer side wall of the upper end of the smoke pipe at its corresponding position and have an interference fit between them. A reserved gap is provided between the bottom of each surrounding constraint channel and the top of the corresponding end cover to be welded. Each powder conveying channel is fixedly connected to each feed port of the multi-pipe ring welding unit and their interiors are connected.

[0015] Preferably, in any of the above solutions, a negative pressure powder metering pump is installed inside each powder conveying channel.

[0016] Preferably, in any of the above solutions, the multi-tube circumferential welding unit includes two pneumatic nozzles fixedly arranged on the outer side walls of the power main shaft tube or the pulley secondary shaft tube opposite to each other. During operation, the lower material spraying ports of the pneumatic nozzles are all inclined towards the annular joint. The feeding ports of the pneumatic nozzles are communicated with the inside of the powder conveying channels at their corresponding positions. During operation, the negative pressure powder metering pump inside the powder conveying channels quantitatively conveys metal powder solder to the pneumatic nozzles; a micro-welding torch is arranged on one side of each pneumatic nozzle, and the upper parts of the micro-welding torches are fixedly arranged on the outer side walls of the power main shaft tube or the pulley secondary shaft tube at their corresponding positions. During operation, the working ends of the micro-welding torches ignite the metal powder solder at the annular weld part and completely melt it.

[0017] Preferably, in any of the above solutions, the wire routing of the micro-welding torches is all completed inside the powder conveying channels or through the preset clamping cavities between the powder conveying channels, the power main shaft tube, and the pulley secondary shaft tube, so as to achieve the purpose of not affecting the normal rotation of each component and preventing wire routing interference.

[0018] Preferably, in any of the above solutions, the solder shunt conveying unit includes a fixedly arranged storage bin body. A powder storage cavity is arranged inside the storage bin body. The top of the storage bin body is fixedly installed at the bottom of the main motor frame, and the bottom of the storage bin body is fixed on the top of the box end cover of the multi-row tube linkage mechanism. A central positioning hole for the power main shaft tube on the multi-row tube linkage mechanism to pass through movably and sealingly is arranged at the center of the storage bin body. Powder feeding pipes are symmetrically arranged on the top of the storage bin body on both sides of the central positioning hole. The powder feeding pipes are connected to an external pneumatic feeding device through an external pipe with a pump. The corresponding power main shaft tube or pulley secondary shaft tube is movably and sealingly inserted into the mounting holes at the bottom of each storage bin body. The upper part of the powder conveying channel of the power main shaft tube is communicated with the powder storage cavity through the central suction ports evenly spaced on its upper outer side wall. The tops of the powder conveying channels of the pulley secondary shaft tubes are all communicated with the inside of the powder storage cavity; under the action of negative pressure suction, the metal powder solder accumulated inside the powder storage cavity is quantitatively conveyed along the powder conveying channels to the pneumatic nozzles.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention cooperates with the existing multi-axis robotic arm to precisely move in the X-axis, Y-axis, and Z-axis directions, enabling each power main shaft tube and pulley secondary shaft tube of the multi-tube circumferential welding unit to quickly and accurately align with the corresponding center axis of the smoke tube. The large-torque rotation alignment motor of the center control component is quickly adjusted during positioning to ensure the precise welding position. This precise positioning provides the basis for subsequent welding. With the cooperation of the circumferential welding drive mechanism and the multi-row tube linkage mechanism, the multi-tube circumferential welding unit can synchronously weld the annular seams between each smoke tube and the end cap. Compared with traditional single-tube welding, the welding efficiency is greatly improved, while the welding error is reduced, ensuring the weld quality and welding strength.

[0021] 2. The multi-row tube linkage mechanism, solder delivery, and the welding part of the multi-tube circumferential welding cooperate with each other to improve the overall efficiency of the multi-ring circumferential welding; the solder shunt delivery unit receives, stores, and precisely shunts and delivers the metal powder solder through negative pressure suction and a negative pressure powder metering pump, and quantitatively delivers the solder to the pneumatic nozzle of the multi-tube circumferential welding unit. The circumferential welding drive mechanism drives the multi-row tube linkage mechanism to operate, causing the pneumatic nozzle and the micro-welding torch in the multi-tube circumferential welding unit to rotate around the periphery of the smoke tube on a fixed axis. The pneumatic nozzle sprays the material, and the micro-welding torch performs the welding. All parts cooperate closely, optimizing the welding process, improving the overall performance of the equipment, and enhancing the adaptability and versatility of the equipment for welding smoke tubes of different specifications.

[0022] 3. The main drive motor of the circumferential welding drive mechanism is directly connected to the power main shaft tube of the multi-row tube linkage mechanism, efficiently transmitting power. The multi-groove drive pulley, multi-groove driven pulley, and protective belt of the multi-row tube linkage mechanism work together to transmit the power to each pulley secondary shaft tube, driving the groups of pneumatic nozzles and micro-welding torches in the multi-tube circumferential welding unit to rotate stably. The power main shaft tube and the pulley secondary shaft tube not only transmit power but also convey solder, making the structure more compact and reasonable.

[0023] 4. The storage bin body of the solder shunt delivery unit is movably and hermetically connected to the power main shaft tube and the pulley secondary shaft tube through the central positioning hole and the mounting hole. The central suction port of the power main shaft tube and the top of the pulley secondary shaft tube are communicated with the powder storage cavity. Under the action of negative pressure, the solder enters the powder delivery channel; the negative pressure powder metering pump in the channel precisely controls the amount of solder and adjusts the delivery speed according to different welding requirements. When the power main shaft tube and the pulley secondary shaft tube rotate, the solder is quantitatively delivered to the pneumatic nozzle of the multi-tube circumferential welding unit, ensuring that each welding point obtains an appropriate amount of solder, avoiding waste, and improving the consistency of welding quality.

[0024] 5. The circumferential restraint channels at the lower parts of the power spindle tube and the pulley secondary shaft tube are in clearance fit with the outer sidewall of the upper end of the smoke tube, and there is a reserved gap at the bottom with the top of the end cover. This design enables the circumferential restraint channels not only to position and restrain the rotation of the pneumatic nozzle and the micro-welding torch around the smoke tube, ensuring the stable positions of the smoke tube, the pneumatic nozzle, and the micro-welding torch during the welding process, reducing the position deviation caused by vibration or external force interference, and improving the welding position accuracy; but also to guide the solder coming from the powder conveying channel to accurately reach the annular seam between the smoke tube and the end cover through the reserved gap, and cooperate with the micro-welding torch to achieve precise welding.

[0025] 6. The multiple pneumatic nozzles and micro-welding torches of the multi-tube ring welding unit are respectively fixed on the outer sidewalls of the corresponding power spindle tube or pulley secondary shaft tube, and can rotate synchronously around the periphery of the smoke tube driven by them. The lower spray orifice of the pneumatic nozzle is inclined towards the annular seam, and under the action of the negative pressure powder metering pump, the metal powder solder is accurately sprayed onto the welding part. The working end of the micro-welding torch precisely ignites to melt the solder, and multiple nozzles and torches work simultaneously, 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. 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 will briefly introduce the drawings required for use in the description of the specific embodiments or 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 to actual scale.

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

[0028] Figure 2 It is a front-view structural schematic diagram of the use state of the multi-smoke-tube rapid positioning welding device for a pressure boiler of the present invention.

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

[0030] Figure 4 It is a three-dimensional structural schematic diagram of the second perspective of the multi-smoke-tube rapid positioning welding device for a pressure boiler of the present invention.

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

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

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

[0034] Figure 8 This is an internal display schematic diagram of the internal structure of the multi-row pipe linkage mechanism of the present invention and the connecting components below it.

[0035] Figure 9 This is a structural schematic diagram of the power main shaft pipe of the present invention and the components installed thereon.

[0036] Figure 10 is Figure 9 a partial internal sectional structural schematic diagram.

[0037] Figure 11 This is a partial internal sectional structural schematic diagram of the belt pulley sub-shaft pipe of the present invention and the components installed thereon.

[0038] Figure 12 This is a three-dimensional structural schematic diagram of the belt pulley box of the present invention.

[0039] Figure 13 This is a three-dimensional display schematic diagram of the internal structure of the material storage bin body of the present invention.

[0040] In the figure, 1, positioning platform; 2, restraining riser; 3, solder shunt conveying unit; 4, rotating alignment motor; 5, main motor frame; 6, total drive motor; 7, belt pulley box; 8, multi-groove passive belt pulley; 9, multi-groove driving belt pulley; 10, protective belt; 11, power main shaft pipe; 12, box end cover; 13, belt pulley sub-shaft pipe; 14, central suction port; 15, blocking inner partition; 16, powder conveying channel; 17, surrounding restraint channel; 18, negative pressure powder metering pump; 19, pneumatic nozzle; 20, micro-welding torch; 21, material storage bin body; 22, powder storage cavity; 23, central positioning hole; 24, powder feed pipe; 25, smoke pipe, 26 end cover; 27 annular joint; 28, installation circular cavity. Specific embodiments

[0041] Next, embodiments of the technical solutions of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention. The specific structure of the present invention is as Figures 1-13 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 rate: When the current is high and the flow rate is high, the plasma arc has high energy and strong impact force. The micro-welding torch 20 needs to be far away from the joint, and the distance is 6 - 8 mm.

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

[0049] If the current is 30 - 100 A and the plasma gas flow rate is moderate, the distance is controlled at 4 - 6 mm, which can ensure the stability of the arc and sufficient heat transfer, so that the metal powder solder melts evenly and fuses well with the base material.

[0050] Considering the thickness and material of the current smoke pipe 25 and end cap 26 weldments: The thicker the weldment, the faster the heat dissipation, and more heat is required. The micro-welding torch 20 is close to the joint, and a distance of 3 - 5 mm is appropriate. For carbon steel smoke pipes 25 and end caps 26 with a thickness of 5 - 10 mm, getting closer can ensure sufficient heat input to fully melt the metal powder and fill the weld.

[0051] Considering the characteristics of the metal powder solder: For metal powder with fine particles and low melting point, it is easy to melt, and the distance of the micro-welding torch 20 can be slightly farther, 5 - 7 mm. Because its melting speed is fast, if the distance is too close, it is easy to cause excessive melting and splashing of the 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 torch 20 is close to the joint, and a distance of 4 - 6 mm is appropriate to ensure that the powder can fully melt and combine with the base material. Specifically, it is reasonably operated and controlled by those skilled in the art, and an appropriate in-place switch is configured to detect the in-place position.

[0052] When the entire multi-smoke pipe rapid positioning welding device for the pressure boiler is working, first, the tops of the respective smoke pipes 25 to be welded at the bottom are respectively threadedly screwed and installed in the respective threaded through holes of the corresponding end caps 26 to be welded, and ensure that the tops of the respective smoke pipes 25 extend 50 mm - 100 mm above the tops of the end caps 26. The assembled respective smoke pipes 25 are vertically hoisted by a hoisting device, and the bottoms are respectively inserted and fitted into the interiors of the restraint risers 2 at the tops of the corresponding positioning platforms 1. To maintain the stability of the entire multi-smoke pipes 25, additional positioning can also be performed according to positioning needs. After the respective smoke pipes 25 and end caps 26 to be welded are installed in place, wait for the welding operation to be controlled.

[0053] When this device is working, control the external pneumatic feeding device to work. It can quickly pneumatically transport the metal powder solder for welding into the interior of the solder shunt conveying unit 3 as needed. When the metal powder solder enters the interior of the current solder shunt conveying unit 3, it will continue to be shunted and conveyed into the interior of the corresponding multi-pipe ring welding unit under the action of negative pressure shunt conveying and shunted to the annular joint 27 parts at the corresponding positions of the respective smoke pipes 25 to be welded.

[0054] While feeding solder to the annular weld 27, control the operation of the circumferential welding drive mechanism to drive the multi-row pipe linkage mechanism to operate. When the multi-row pipe linkage mechanism operates, it can synchronously drive each pneumatic nozzle 19 inside the current multi-pipe circumferential welding unit to spray materials outward at an appropriate pressure and speed.

[0055] During the process of solder spraying, keep rotating around the periphery of the current coaxial smoke pipe 25. At the same time, the micro-welding torch 20 on one side of the pneumatic nozzle 19 also rotates around the periphery of the current coaxial smoke pipe 25 and quickly performs high-temperature welding on the metal powder solder falling at the annular joint 27 during the rotation process, so as to realize the rapid fusion of the solder and the base material into an integral annular weld. Controlling the number of rotation circles can effectively control the number of circumferential welding times to ensure the quality of the welded seam and the welding strength.

[0056] In addition, it should be noted that during the welding process, reasonably control the feeding amount and uniformity of the metal powder solder as much as possible, and reasonably control parameters such as the feeding speed, pressure, and flow rate to ensure the relative concentration of the solder at the annular joint 27, and avoid and reduce the situation of the solder being scattered around.

[0057] In any of the above solutions, preferably, the central control and alignment member includes a high-torque rotational alignment motor 4 that is vertically arranged and fixedly installed at the mobile end of the multi-axis robotic arm outside. At the bottom of the motor shaft of the rotational alignment motor 4, the circumferential welding drive mechanism is fixedly installed.

[0058] The central control and alignment member adopts a high-torque rotational alignment motor 4 and is vertically installed at the mobile end of the multi-axis robotic arm, providing a flexible rotational function for the entire welding device. The rotational alignment motor 4 can drive the circumferential welding drive mechanism, the multi-row pipe linkage mechanism, the solder shunt and conveying unit 3, and the multi-pipe circumferential welding unit to rotate, so as to play a role in quickly adjusting when all the multi-pipe circumferential welding units and each smoke pipe 25 are centered and positioned.

[0059] In any of the above solutions, preferably, the circumferential welding drive mechanism includes a main motor frame 5 fixedly installed at the bottom of the motor shaft of the rotational alignment motor 4. A total drive motor 6 is fixedly installed inside the main motor frame 5. The bottom of the main motor frame 5 is fixedly installed on the top of the solder shunt and conveying unit 3. The lower end of the output shaft of the total drive motor 6 is connected to the power main shaft tube 11 at the center top of the multi-row pipe linkage mechanism. The power main shaft tube 11 of the multi-row pipe linkage mechanism moves upward and downward and seals through the central hole of the solder shunt and conveying unit 3 and extends above it.

[0060] When the circumferential welding drive mechanism works, the rotation of the main drive motor 6 can drive the rotation of the power main shaft tube 11 of the multi-row pipe linkage mechanism, and then transmit the power to the inside of the multi-row pipe linkage mechanism. Under the combined action of each belt transmission component inside the multi-row pipe linkage mechanism, each pneumatic nozzle 19 and the micro spray gun 20 on the multi-pipe circumferential welding unit can be driven to rotate around the periphery of the smoke pipe 25 at their respective positions, so as to complete the circumferential welding operation on the circumferential joint 27 part between each smoke pipe 25 and the end cover 26 after cooperating with pneumatic feeding and energizing the plasma welding.

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

[0062] Preferably, in any of the above solutions, the multi-row pipe linkage mechanism includes a pulley box body 7 fixedly installed at the bottom of the solder shunting and conveying unit 3. Inside the installation circular cavity 28 of the pulley box body 7, several multi-groove driven belt pulleys 8 are arranged at intervals in an array. A multi-groove driving belt pulley 9 is arranged at the center of the installation circular cavity 28. The multi-groove driving belt pulley 9 and each of the multi-groove driven belt pulleys 8, and between two adjacent multi-groove driven belt pulleys 8 are cooperatively connected through corresponding protective belts 10. The power main shaft tube 11 is fixedly inserted at the center of the multi-groove driving belt pulley 9. A box body end cover 12 is fixedly installed on the top of the pulley box body 7. On the top of the box body end cover 12 and the bottom of the pulley box body 7, several through holes coaxial with the central shafts of the corresponding multi-groove driven belt pulleys 8 and the power main shaft tube 11 of the multi-groove driving belt pulley 9 are arranged in an array distribution. Both ends of the power main shaft tube 11 of the multi-groove driving belt pulley 9 pass through the corresponding through holes and extend out of the top and bottom of the installation circular cavity 28 movably. The upper and lower ends of the belt pulley secondary shaft tube 13 fixedly connected to the center of each multi-groove driven belt pulley 8 pass through the corresponding through holes and extend out of the top and bottom of the installation circular cavity 28 movably.

[0063] The main function of the multi-row pipe linkage mechanism is to transfer power from the power main shaft pipe 11 to each pulley sub-shaft pipe 13 under the combined action of the multi-groove driving pulley 9, each multi-groove driven pulley 8, and each protective belt 10, thereby driving the pneumatic nozzles 19 and the micro-spray guns 20 on the multi-pipe circular welding unit connected to the pulley sub-shaft pipe 13 to perform synchronous movement around the corresponding pulley sub-shaft pipe 13 respectively. At the same time, the power main shaft pipe 11 itself will also drive the pneumatic nozzles 19 and the micro-spray guns 20 installed thereon to rotate. The specific process is as follows:

[0064] The power of the main driving motor 6 is transmitted to the multi-groove driving pulley 9 through the power main shaft pipe 11. The multi-groove driving pulley 9 transmits the power to the surrounding multi-groove driven pulleys 8 through the protective belt 10, and then drives the pulley sub-shaft pipe 13 connected to the multi-groove driven pulley 8 to rotate. Since the pulley sub-shaft pipe 13 is connected to the pneumatic nozzles 19 and the micro-spray guns 20 that need to be driven, finally, the multiple pneumatic nozzles 19 and the micro-spray guns 20 are respectively rotated as required, and the movement around the outer side walls of the corresponding smoke pipes 25 is completed.

[0065] In any of the above solutions, preferably, the top of the power main shaft pipe 11 is sealed and the inside is hollow. The inside of each pulley sub-shaft pipe 13 is hollow and vertically through. The top of each pulley sub-shaft pipe 13 extends into the inside of the solder splitting and conveying unit 3 movably and sealingly. The top of each power main shaft pipe 11 extends through the center of the solder splitting and conveying unit 3 movably and sealingly and extends above it and is connected to the output shaft of the main driving motor 6. A plurality of central suction ports 14 that communicate the inner cavity with the inside of the solder splitting and conveying unit 3 are evenly spaced along the circumferential direction on the outer side wall of the power main shaft pipe 11 inside the solder splitting and conveying unit 3.

[0066] During operation, the top of the power main shaft pipe 11 is connected to the output shaft of the main driving motor 6. When the main driving motor 6 starts to operate, the output shaft drives the power main shaft pipe 11 to rotate. Since the power main shaft pipe 11 is fixedly inserted in the center of the multi-groove driving pulley 9, the rotation of the power main shaft pipe 11 will drive the multi-groove driving pulley 9 to rotate. The multi-groove driving pulley 9 transmits the power to the multi-groove driven pulley 8 through the protective belt 10, and then drives the pulley sub-shaft pipe 13 connected to the multi-groove driven pulley 8 to rotate. Finally, the operation of the entire multi-row pipe linkage mechanism is realized, and the pneumatic nozzles 19 and the micro-spray guns 20 of the multi-pipe circular welding unit are driven to perform circular welding operations.

[0067] The power main shaft pipe 11 not only undertakes the function of transmitting the power of the main driving motor 6, but also serves as one of the channels for solder conveying. Integrating the two functions of power transmission and solder conveying on one component makes the structure of the entire mechanism more compact, reduces additional components and space occupation, and reduces the complexity and cost of the equipment.

[0068] The central material suction ports 14 on the outer side wall of the power main shaft tube 11 are evenly spaced along the circumference, enabling the solder to enter the inner cavity of the power main shaft tube 11 evenly from all directions, ensuring that the solder can be more evenly distributed after entering the power main shaft tube 11.

[0069] In any of the above - preferred solutions, a plugging inner partition 15 is installed in the lower part of the inner cavity of the power main shaft tube 11 and the lower part of the inner cavity of each belt - pulley secondary shaft tube 13. The plugging inner partition 15 divides the corresponding inner cavity into a powder - material conveying channel 16 in the upper part and a surrounding constraint channel 17 in the lower part. The tops of the powder - material conveying channels 16 are all connected to the inside of the solder shunt conveying unit 3. The lower ends of the surrounding constraint channels 17 are all connected to the outside. The lower ends of the surrounding constraint channels 17 are all used for sleeving on the outer side wall of the upper end of the smoke tube 25 at their corresponding positions with a clearance fit. A reserved gap is provided between the bottom of each surrounding constraint channel 17 and the top of the corresponding end - cover 26 to be welded. Each powder - material conveying channel 16 is fixedly connected to each feed port of the multi - tube circular welding unit and their interiors are connected.

[0070] The upper parts of the power main shaft tube 11 and the belt - pulley secondary shaft tubes 13 are separated by the plugging inner partition 15 to form powder - material conveying channels 16, whose tops are connected to the inside of the solder shunt conveying unit 3. When the solder enters through the central material suction port 14 of the power main shaft tube 11, it will flow in the powder - material conveying channels 16 and be evenly conveyed to each feed port of the multi - tube circular welding unit according to the layout and pressure distribution of each channel, providing a stable supply of metal - powder solder for the subsequent welding operation.

[0071] The lower surrounding constraint channels 17 have a clearance fit with the outer side 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 conveyed from the powder - material conveying channels 16 will enter the inside of the feed pipe of the corresponding pneumatic nozzle 19. 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 and accurately reached the annular joint 27 between the smoke tube 25 and the end - cover 26 through the reserved gap, ensuring that the solder can act precisely on the welding position.

[0072] The lower end of the surrounding constraint channel 17 is sleeved on the outer side wall of the upper end of the smoke tube 25, playing a role in positioning and constraining the rotation of the pneumatic nozzle 19 and the micro - welding torch 20 around the smoke tube 25. It can ensure that during the welding process, the smoke tube 25, the pneumatic nozzle 19, and the micro - welding torch 20 are in relatively stable positions, reducing the position deviation caused by vibration or external force interference, making the welding position more accurate and improving the welding quality.

[0073] The solder in the powder delivery channel 16 enters the feed pipe of the pneumatic nozzle 19. The pneumatic nozzle 19 surrounds the smoke pipe 25. Under the action of pneumatic feeding, the solder can accurately reach the annular joint 27 between the smoke pipe 25 and the end cover 26 through the reserved gap, and cooperate with the plasma welding of the micro-welding torch 20 to achieve annular welding.

[0074] Preferably, in any of the above solutions, a negative pressure powder metering pump 18 is installed inside each of the powder delivery channels 16.

[0075] The negative pressure powder metering pump 18 can create a negative pressure environment inside the powder delivery channel 16. Under this negative pressure, the metal powder solder located in the solder shunt delivery unit 3 can more smoothly enter the powder delivery channel 16 through the central suction port 14 of the power spindle pipe 11 and flow along the channel towards the feed ports 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 a timely manner. The negative pressure powder metering pump 18 can accurately control the amount of metal powder solder entering the powder delivery channel 16. By precisely adjusting the pump, the amount of solder delivered each time can be accurately set according to different welding requirements and process requirements, ensuring that each welding point can obtain an appropriate amount of solder and avoiding the situation of too much or too little solder. During the actual delivery process, the negative pressure powder metering pump 18 can adjust its working parameters, thereby changing the negative pressure magnitude and flow rate inside the powder delivery channel 16. This enables the operator to flexibly adjust the delivery speed of the solder according to the actual welding progress and process requirements to adapt to different welding scenarios, such as welding of smoke pipes 25 with different pipe diameters and requirements for different welding speeds. 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 amount and speed. This enables the equipment to adapt to the welding requirements of various specifications and types of smoke pipes 25, improving the flexibility and adaptability of production and reducing the equipment adjustment cost and time when changing product specifications.

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

[0077] The multi-tube circumferential welding unit includes two pneumatic nozzles 19 fixedly arranged opposite to each other on the outer side walls of the power main shaft tube 11 or the pulley auxiliary shaft tube 13. During operation, the lower material spraying openings of the pneumatic nozzles 19 are all inclined towards the annular joint 27. The feeding openings of the pneumatic nozzles 19 are communicated with the inside of the powder conveying channel 16 at their corresponding positions. During operation, the negative pressure powder metering pump 18 inside the powder conveying channel 16 quantitatively conveys metal powder solder to the pneumatic nozzles 19; on one side of each pneumatic nozzle 19, a micro-welding torch 20 is arranged. The upper parts of the micro-welding torches 20 are fixedly arranged on the outer side walls of the power main shaft tube 11 or the pulley auxiliary shaft tube 13 at their corresponding positions. During operation, the working ends of the micro-welding torches 20 ignite the metal powder solder at the annular weld 27 part and completely melt it.

[0078] The pneumatic nozzles 19 are relatively fixedly arranged on the outer side walls of the power main shaft tube 11 or the pulley auxiliary shaft tube 13, and their feeding openings are communicated with the powder conveying channel 16. Under the action of the negative pressure powder metering pump 18, the metal powder solder is quantitatively conveyed into the pneumatic nozzles 19. During operation, the lower material spraying openings of the pneumatic nozzles 19 are inclined towards the annular joint 27, and can accurately spray the metal powder solder to the annular joint 27 part of the smoke pipe 25 and the end cover 26, providing the required filling material for welding. The micro-welding torches 20 are arranged on one side of the pneumatic nozzles 19, and their upper parts are fixed on the outer side walls of the power main shaft tube 11 or the pulley auxiliary shaft tube 13. After the metal powder solder is sprayed to the annular weld 27 part, the working ends of the micro-welding torches 20 ignite towards these metal powder solders. The high temperature generated by the micro-welding torches 20 can completely melt the metal powder solder at the annular weld 27 part, making it fuse with the base materials of the smoke pipe 25 and the end cover 26, thus achieving the purpose of welding.

[0079] Driven by the power main shaft tube 11 or the pulley auxiliary shaft tube 13, the pneumatic nozzles 19 and the micro-welding torches 20 can rotate synchronously around the periphery of the smoke pipe 25. During the rotation process, the pneumatic nozzles 19 continuously spray solder, and the micro-welding torches 20 continuously perform welding. The two work together to complete the circumferential welding operation of the annular joint 27 between the smoke pipe 25 and the end cover 26.

[0080] The advantages of the multi-tube circumferential welding unit structure are as follows: achieving precise welding: the design that the pneumatic nozzles 19 are inclined towards the annular joint 27 ensures that the metal powder solder can be accurately sprayed to the welding part, avoiding waste and scattering of the solder. At the same time, the working ends of the micro-welding torches 20 accurately face the metal powder solder at the annular weld 27 part, enabling 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 torches 20 in the multi-tube circular welding unit can work simultaneously, enabling the simultaneous welding of the circular seams 27 between each flue tube 25 and the end cap 26. Moreover, since the pneumatic nozzles 19 and micro-welding torches 20 can rotate synchronously around the periphery of the flue tube 25, solder spraying and welding operations are continuously performed during the rotation process, greatly improving the welding efficiency and shortening the welding time.

[0082] Achieve quantitative control of solder: The setting of the negative pressure powder metering pump 18 enables the metal powder solder to be quantitatively transported to the pneumatic nozzle 19, ensuring that the solder supply amount at each welding point is uniform and appropriate. This helps to avoid welding defects caused by excessive or insufficient solder and improves the consistency of welding quality.

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

[0084] Preferably, in any of the above solutions, the wire routing of the micro-welding torch 20 is completed inside the powder conveying channel 16 or through a preset clamping cavity between the powder conveying channel 16, 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 wire routing interference.

[0085] When the multi-tube ring welding unit is working, the power main shaft tube 11 and the pulley sub-shaft tube 13 drive the pneumatic nozzle 19 and the micro-welding torch 20 to rotate around the smoke tube 25. If the wire routing is arranged outside, it is very likely to rub and wind with other components during the rotation, hindering the rotation of the components. By arranging the wire routing inside the powder conveying channel 16 or the preset clamping cavity, the wire routing rotates with the components together, without causing additional resistance or interference to the rotation, ensuring the smooth progress of power transmission and rotation actions. By hiding the wire routing in the powder conveying channel 16 or the clamping cavity, it can effectively avoid collisions and squeezes with other components, reduce the risk of failures caused by wire routing interference, and ensure the stability and reliability of the entire welding system. For those skilled in the art, hiding the wire routing in the internal space reduces the exposure of the wires, reducing the risk of safety accidents such as electric shock for operators due to accidental contact with the wires. At the same time, it also avoids damage to the wires due to external factors (such as dust, moisture, mechanical collisions, etc.), extending the service life of the wires. This wire routing method is mainly to avoid affecting the normal rotation of each component and prevent wire routing interference, ensuring the stable operation of the equipment. It should be noted that: the core of the present invention lies in realizing the rapid positioning welding of multiple rows of smoke tubes, with the focus on the collaborative innovative design of the multi-row pipe linkage mechanism, solder delivery, and welding. The wire routing method is based on the operating requirements of the equipment and uses the existing well-known wire routing methods to ensure the stable operation of the equipment, which is not the key improvement of the present invention.

[0086] Preferably, in any of the above solutions, the solder split delivery unit 3 includes a fixedly arranged storage bin body 21. Inside the storage bin body 21, there is a powder storage cavity 22. The top of the storage bin body 21 is fixedly installed at the bottom of the main motor frame 5, and the bottom of the storage bin body 21 is fixed on the top of the box end cover 12 of the multi-row pipe linkage mechanism. A central positioning hole 23 is provided at the center of the storage bin body 21 for the power main shaft tube 11 on the multi-row pipe linkage mechanism to pass through in an activity-sealed manner. On both sides of the central positioning hole 23, powder feed pipes 24 are symmetrically arranged at the top of the storage bin body 21 respectively. The powder feed pipes 24 are connected to external pneumatic feeding equipment through external pump pipelines. Corresponding power main shaft tubes 11 or pulley sub-shaft tubes 13 are respectively inserted in an activity-sealed manner in the mounting holes at the bottom of each storage bin body 21. The upper part of the powder conveying channel 16 of the power main shaft tube 11 is communicated with the powder storage cavity 22 through each central suction port 14 uniformly spaced on its upper outer side wall. The tops of the powder conveying channels 16 of each pulley sub-shaft tube 13 are all communicated with the inside 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 open and is precisely docked with the opening at the corresponding position at the bottom of the storage bin body 21.

[0088] The solder shunt conveying unit 3 in the multi-smokestack quick positioning welding device for a pressure boiler undertakes the key tasks of receiving, storing, and precisely shunting and conveying the metal powder solder. Its working principle is closely related to the coordinated operation of each component, as follows:

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

[0090] A central positioning hole 23 is provided in the center of the storage bin body 21. The power main shaft tube 11 on the multi-pipe linkage mechanism passes through this hole in a movable and sealed manner and extends to its top, and the top of the power main shaft tube 11 is blocked to restrict the upward flow of the powder, so that it can only enter its interior 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 main shaft tube 11 through these central suction ports 14. At the same time, each pulley secondary shaft tube 13 is movably and sealed and 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 inside of the powder storage cavity 22 and also receives the solder under the action of negative pressure.

[0091] The powder conveying channels 16 of the power main shaft tube 11 and the pulley secondary shaft tube 13 not only undertake the task of conveying the solder but also are responsible for distributing the solder to the multi-pipe 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 driven by the multi-groove driven pulley 8. During the rotation, the solder inside the two is quantitatively conveyed to the pneumatic nozzles 19 of the respective connected multi-pipe ring welding units 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, under the pressure difference generated by the negative pressure powder metering pump 18 and the guidance of the conveying channel 16, the metal powder solder enters the pneumatic nozzle 19 from the powder conveying channel 16, providing sufficient solder supply for the welding operation at the annular joint 27 between the smokestack 25 and the end cover 26.

[0094] The method steps for using this device to complete the welding of the annular joint 27 between each smokestack 25 and the end cover 26 are as follows:

[0095] Step 1: Equipment Preparation and Positioning: Equipment Startup and Parameter Setting: Turn on the power supply of the entire multi-exhaust-pipe rapid positioning welding device for the pressure boiler, and start the external pneumatic feeding equipment, the main drive motor 6, and the control system of the supporting multi-axis robotic arm.

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

[0097] Multi-axis Robotic Arm Positioning: Under the command of the control system, the multi-axis robotic arm drives the entire welding device to move in the X-axis, Y-axis, and Z-axis directions, and real-time monitors the position information through the limit switch, so that the multi-tube circumferential welding unit gradually approaches each to-be-welded smoke pipe 25.

[0098] Start the high-torque rotation alignment motor 4 of the central control component, and adjust the angle and position of the multi-tube circumferential welding unit to ensure that each pneumatic nozzle 19 and the micro-welding torch 20 of the multi-tube circumferential welding unit accurately align with the annular joint 27 between the smoke pipe 25 and the end cover 26, realizing precise centering and positioning.

[0099] Surrounding Constraint Channel Socketing: The surrounding constraint channels 17 at the lower parts of the power main shaft pipe 11 and the belt pulley sub-shaft pipe 13 are accurately socketed on the outer side wall of the upper end of the corresponding smoke pipe 25, and are in clearance fit with the smoke pipe 25. At the same time, ensure that a preset gap is left between the bottom of the surrounding constraint channel 17 and the top of the to-be-welded end cover 26.

[0100] Step 2: Solder Conveyance and Preparation, Solder Input and Storage: The external pneumatic feeding equipment conveys the metal powder solder to the powder feeding pipe 24 of the solder shunt conveying unit 3 through the pipe with a pump.

[0101] The metal powder solder enters the powder storage cavity 22 inside the storage bin body 21 through the powder feeding pipe 24, completing the storage of the solder.

[0102] Solder Shunting and Conveyance: 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 main shaft pipe 11 through the central suction port 14 on the outer side wall of the upper part of the power main shaft pipe 11, and also enters its powder conveying channel 16 through the top of the belt pulley sub-shaft pipe 13.

[0103] The negative-pressure powder metering pumps 18 in each powder conveying channel 16 start to work, and quantitatively convey the metal powder solder to the inside of the feeding pipe of the corresponding pneumatic nozzle 19 according to the pre-set parameters.

[0104] Step 3: Welding Operation Execution, Power Transmission and Component Rotation: Start the main drive motor 6, its output shaft drives the power main shaft pipe 11 to rotate, and the power main shaft pipe 11 drives the multi-groove drive pulley 9 fixed thereto to rotate.

[0105] The multi-groove drive pulley 9 transmits power to the multi-groove driven pulleys 8 distributed in a surrounding array through the protective belt 10, thereby driving the rotation of each pulley secondary shaft tube 13.

[0106] The rotation of the power main shaft tube 11 and the pulley secondary shaft tube 13 drives the pneumatic nozzle 19 and the micro-welding torch 20 connected thereto to rotate synchronously around the periphery of their respective smoke pipes 25.

[0107] Solder injection and welding: During the rotation process, the lower material spraying port of the pneumatic nozzle 19 is inclined towards the annular joint 27 between the smoke pipe 25 and the end cover 26, and the metal powder solder is accurately sprayed onto the annular joint 27.

[0108] The working end of the micro-welding torch 20 ignites the metal powder solder at the annular weld 27, generating high temperature to completely melt the metal powder solder, making it fuse with the base materials of the smoke pipe 25 and the end cover 26 to complete the welding operation.

[0109] Completion and finishing of welding: As the power main shaft tube 11 and the pulley secondary shaft tube 13 continue to rotate, the pneumatic nozzle 19 continues to spray materials, and the micro-welding torch 20 continues to weld until the entire annular welding operation of the annular joint 27 between the smoke pipe 25 and the end cover 26 is completed.

[0110] After welding is completed, sequentially turn off 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 robotic arm, move the device away, and perform quality inspection and subsequent processing on the welded components.

[0111] To sum up, the rapid positioning welding device for multiple smoke pipes of the pressure boiler of the present invention is accurately moved to the welding position driven by the multi-axis robotic arm, and the multi-pipe ring welding unit synchronously welds each annular joint 27 between the smoke pipes 25 and the end covers 26. The whole process is efficient, accurate, and stable, with significant advantages. The specific operation process and advantages are as follows:

[0112] Installation and preparation stage: Install the device on the mobile end of the external multi-axis robotic arm, connect each electrical equipment to the distribution box, and connect the solder shunt 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 by 50 - 100 mm, and then vertically lift it with a hoisting device and insert it into the restraining vertical pipe 2 of the positioning platform 1. This installation method ensures the accuracy and smoothness of the device movement by using the multi-axis robotic arm. Compared with manual positioning, it greatly improves the positioning efficiency and accuracy. 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 welded parts during the welding process, laying a foundation for high-quality welding.

[0113] Positioning stage: The multi-axis robotic arm drives the device to move. 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 gives a reminder. This precise positioning method enables the welding device to quickly and accurately reach the welding position, reducing the adjustment time, improving the production efficiency, and ensuring the accuracy of the welding position, thus avoiding welding defects caused by positioning deviation.

[0114] Solder delivery stage: The external pneumatic feeding equipment transports the metal powder solder to the solder shunt and delivery unit 3. Under the action of negative pressure, this unit quantitatively shunts the solder to the multi-tube ring welding unit and delivers it to the annular joints 27 of each smoke tube 25. This process realizes the precise quantitative delivery of the solder, ensuring that each welding point can obtain an appropriate amount of solder, avoiding solder waste, and ensuring the consistency of welding quality. It is more uniform and efficient compared to manual feeding.

[0115] Welding stage: The ring welding drive mechanism operates, driving the multi-row tube linkage mechanism, and then causing the pneumatic nozzles 19 and the micro-welding torches 20 in the multi-tube ring welding unit to rotate around the outer periphery of the smoke tube 25 on a fixed axis. The pneumatic nozzles 19 spray the material at an appropriate pressure and speed, and the micro-welding torches 20 weld the solder that has fallen on the annular joint 27. The distance between the micro-welding torch 20 and the joint is adjusted between 3 - 8 mm according to various factors. This multi-tube synchronous welding method significantly improves the welding efficiency compared to traditional single-tube welding. Precise control of the welding distance and a stable rotational welding process ensure the welding quality, reduce welding defects, and improve the strength and aesthetics of the weld seam.

[0116] Welding parameter control stage: During the welding process, parameters such as 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, reducing the situation of being scattered around, improving the solder utilization rate, avoiding pollution to the working environment, and ensuring the stability and consistency of the welding process.

[0117] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and 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 technical field, any alternative improvement or transformation made to the embodiments of the present invention falls within the protection scope of the present invention.

[0118] Those parts not detailed in the present invention are all well-known technologies to those skilled in the technical field.

Claims

1. A rapid positioning welding device for multiple smoke exhaust pipes of a pressure boiler, including a central control component, characterized in that: A circumferential welding drive mechanism is fixedly installed at the bottom of the central control position member. A multi-pipe linkage mechanism is installed at the bottom of the circumferential welding drive mechanism. The bottom of the multi-pipe linkage mechanism is connected with a multi-pipe circumferential welding unit. The multi-pipe circumferential welding unit is used to move to between each flue pipe to be welded and the corresponding end cover and synchronously complete the circumferential joint welding of the current flue pipes and end covers under the cooperative action of the circumferential welding drive mechanism and the multi-pipe linkage mechanism. The bottom of each flue pipe is fixedly inserted into the inside of the restraint riser at the top of the corresponding positioning platform below it; A solder shunt and conveying unit is installed between the multi-pipe linkage mechanism and the circumferential welding drive mechanism. Each discharge end of the solder shunt and conveying unit is respectively connected with each feed end of the multi-pipe circumferential welding unit; The multi-pipe linkage mechanism includes a power main shaft pipe. The multi-groove drive pulley, multi-groove driven pulley and protective belt of the multi-pipe linkage mechanism work together to transmit the power of the power main shaft pipe to each belt pulley sub-shaft pipe; The circumferential welding drive mechanism includes a main drive motor. The lower end of the output shaft of the main drive motor is connected with the power main shaft pipe. The power main shaft pipe moves upward and downward and seals through the central positioning hole of the solder shunt and conveying unit and extends above it; The top of the power main shaft pipe is blocked and the inside is hollow. The inside of each belt pulley sub-shaft pipe is hollow and vertically through. The top of each belt pulley sub-shaft pipe moves and seals into the inside of the solder shunt and conveying unit. A number of central suction ports are evenly spaced along the circumference on the outer side wall of the power main shaft pipe inside the solder shunt and conveying unit; A blocking inner partition is installed in the lower part of the inner cavity of the power main shaft pipe and the lower part of the inner cavity of each belt pulley sub-shaft pipe. The blocking inner partition divides the corresponding inner cavity into a powder conveying channel in the upper part and a surrounding restraint channel in the lower part. The top of each powder conveying channel is connected with the inside of the solder shunt and conveying unit. The lower ends of each surrounding restraint channel are all communicated with the outside. The lower ends of each surrounding restraint channel are all used to sleeve on the outer side wall of the upper end of the flue pipe at its corresponding position and have a clearance fit between them. A reserved gap is provided between the bottom of each surrounding restraint channel and the top of the corresponding end cover to be welded. Each powder conveying channel is fixedly connected with each feed port of the multi-pipe circumferential welding unit and the inside of the two is communicated.

2. The quick positioning welding device for multiple smoke exhaust pipes of a pressure boiler according to claim 1, characterized in that: The central control position member includes a large-torque rotation alignment motor that is vertically installed and fixedly installed at the mobile end of an external multi-axis robotic arm. The circumferential welding drive mechanism is fixedly installed at the bottom of the motor shaft of the rotation alignment motor.

3. A rapid positioning welding device for multiple exhaust pipes of a pressure boiler according to claim 2, characterized in that: The circumferential welding drive mechanism further includes a main motor frame fixedly installed at the bottom of the motor shaft of the rotation alignment motor. The 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 shunt and conveying unit.

4. A rapid positioning welding device for multiple exhaust pipes of a pressure boiler according to claim 3, characterized in that: The multi-row pipe linkage mechanism further includes a pulley box body fixedly installed at the bottom of the solder shunt conveying unit. Inside the installation circular cavity of the pulley box body, a number of multi-groove passive belt pulleys are arranged at intervals in an array. A multi-groove driving belt pulley is arranged at the center of the installation circular cavity. The multi-groove driving belt pulley and each of the multi-groove passive belt pulleys, and between two adjacent multi-groove passive belt pulleys, are cooperatively connected through corresponding protective belts. A power main shaft tube is fixedly inserted at the center of the multi-groove driving belt pulley. A box end cover is fixedly installed on the top of the pulley box body. On the top of the box end cover and the bottom of the pulley box body, a number of through holes are respectively arranged in an array, which are coaxially arranged with the belt pulley sub-shaft tubes of the corresponding multi-groove passive belt pulleys and the power main shaft tube of the multi-groove driving belt pulley. Both ends of the power main shaft tube of the multi-groove driving belt pulley pass through the corresponding through holes and extend out of the installation circular cavity to the top and bottom. The upper and lower ends of the belt pulley sub-shaft tubes fixedly connected to the centers of the multi-groove passive belt pulleys respectively pass through the corresponding through holes and extend out of the installation circular cavity to the top and bottom.

5. A rapid positioning welding device for multiple exhaust pipes of a pressure boiler according to claim 4, characterized in that: A negative pressure powder metering pump is installed inside each of the powder conveying channels.

6. The quick positioning welding device for multiple exhaust pipes of a pressure boiler according to claim 5, characterized in that: The multi-pipe circumferential welding unit includes two pneumatic nozzles fixedly arranged on the outer side walls of the power main shaft tube or the belt pulley sub-shaft tubes relatively. The lower material spraying ports of each pneumatic nozzle are inclined towards the annular joint. The feeding ports of each pneumatic nozzle are communicated with the inside of the powder conveying channel at its corresponding position. The negative pressure powder metering pump inside the powder conveying channel quantitatively conveys metal powder solder to the pneumatic nozzle. A micro-welding torch is arranged on one side of each pneumatic nozzle. The upper parts of each micro-welding torch are fixedly arranged on the outer side walls of the power main shaft tube or the belt pulley sub-shaft tubes at their corresponding positions. The working ends of each micro-welding torch ignite the metal powder solder at the annular weld part and completely melt it.

7. A quick positioning and welding device for multiple exhaust pipes of a pressure boiler according to claim 6, characterized in that: The solder shunt conveying unit includes a fixedly arranged storage bin body. Inside the storage bin body, a powder storage cavity is arranged. The top of the storage bin body is fixedly installed at the bottom of the main motor frame. The bottom of the storage bin body is fixed on the top of the box end cover of the multi-row pipe linkage mechanism. A central positioning hole is arranged at the center of the storage bin body for the power main shaft tube on the multi-row pipe linkage mechanism to pass through movably and sealingly. On the top of the storage bin body on both sides of the central positioning hole, powder feeding pipes are symmetrically arranged respectively. The powder feeding pipes are connected to external pneumatic feeding equipment through an external pipeline with a pump. In the installation holes at the bottom of each storage bin body, the corresponding belt pulley sub-shaft tubes are movably and sealingly inserted respectively. The upper part of the powder conveying channel of the power main shaft tube is communicated with the powder storage cavity through each central suction port uniformly arranged on its upper outer side wall. The tops of the powder conveying channels of each belt pulley sub-shaft tube are all communicated with the inside of the powder storage cavity. Under the action of negative pressure suction, the metal powder solder accumulated inside the powder storage cavity is quantitatively conveyed along the powder conveying channel to the pneumatic nozzle.

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