Full-automatic exhaust pipe flame welding machine

Abstract

The full-automatic exhaust pipe flame welding machine comprises a machine frame and a rotary table which is arranged on the machine frame and can rotate intermittently, and a plurality of sets of pipe positioning seats which are evenly distributed in the circumferential direction are arranged on the rotary table. A feeding mechanism, a soldering flux adding mechanism, a flame welding mechanism and a cooling mechanism are sequentially arranged on the machine frame in the circumferential direction of the rotary table. The feeding mechanism is used for feeding and discharging, and the supply mechanism beside the feeding mechanism can achieve automatic sequencing, jacking and 180-degree overturning of the exhaust pipes. Diverters of the flame welding mechanism are connected with flame jet pipes which are evenly distributed in the circumferential direction, workpieces can be evenly heated, and preferably, two adjacent flow dividers are arranged to achieve graded heating. The cooling mechanism adopts a composite cooling mode of first air cooling and then liquid cooling. And the pipe positioning seat is provided with a nitrogen protection passage. The full-process automation of the exhaust pipe from feeding, overturning, soldering flux adding, flame welding, protective cooling to discharging is achieved, the consistency of the welding quality and the production efficiency are remarkably improved, and the labor cost and the labor intensity are reduced.

Description

Technical Field

[0001] This invention relates to the field of flame welding equipment technology, and in particular to a fully automatic exhaust pipe flame welding machine. Background Technology

[0002] As a key component in many industrial products and power systems, the manufacturing quality of exhaust pipes directly affects the performance and reliability of these products. Some types of exhaust pipes are typically made of copper and require reliable connections with other metal components (such as flanges and fittings). Flame brazing (or flame welding) is a common process for joining dissimilar or homogeneous metals. It utilizes a high-temperature flame generated by the combustion of a combustible gas (such as acetylene or propane) mixed with oxygen to heat the workpiece to be welded, causing the filler metal (welding wire) to melt and fill the joint gap, thereby achieving a metallurgical bond between the components.

[0003] Currently, flame welding of exhaust pipes, especially for small to medium batches or specific structures, still relies heavily on manual operation. Operators use welding torches to heat and weld each pre-assembled exhaust pipe assembly with welding wire placed on it. This traditional manual welding method has many drawbacks: First, the welding quality is unstable: Welding quality is highly dependent on the skill level, experience, and working conditions of the operators. It is difficult to maintain absolute consistency in the size and angle of the flame, heating time, and uniformity of the heating area, which can easily lead to inconsistent weld quality, defects such as incomplete penetration, overheating, slag inclusion, and porosity, affecting the airtightness and structural strength of the exhaust pipe.

[0004] Second, low production efficiency: Manual welding is a relatively slow process, involving multiple steps such as part removal, positioning, preheating, wire feeding (if wire feeding is manual), heating, cooling, and part removal. The cycle is long and it is difficult to meet the needs of large-scale or high-efficiency production.

[0005] Third, the labor intensity is high and the working environment is harsh: Operators need to work for long periods of time in high temperature, strong light, and in environments where there may be harmful gases or dust, which poses a threat to workers' health and also leads to problems such as difficulty in recruiting workers and high staff turnover.

[0006] Fourth, high production costs: The reliance on skilled welders leads to increased labor costs, while inconsistent quality may result in higher rework and scrap rates, indirectly increasing production costs.

[0007] Fifth, safety risks: Direct manual operation of high-temperature open flames and high-pressure gases poses certain safety risks.

[0008] To overcome the shortcomings of manual welding, some semi-automatic or partially automated welding equipment has emerged on the market, such as those using simple clamps and robotic arms to drive welding torches. However, these devices are often single-function, typically only automating the welding action. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned shortcomings of the prior art by providing a fully automatic exhaust pipe flame welding machine. This equipment can automate the entire process of exhaust pipe welding, from feeding, flipping and positioning, flux addition, flame welding to cooling and unloading, significantly improving welding quality and production efficiency.

[0010] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A fully automatic exhaust pipe flame welding machine includes a frame, on which a turntable that can rotate intermittently is connected, and a servo motor that drives the turntable to rotate is connected to the bottom of the turntable. The servo motor is fixed on the frame and fixedly connected to the frame. Multiple sets of pipe positioning seats evenly distributed around the circumference are fixed on the turntable. The frame is equipped with two adjacent feeding mechanisms, a flux adding mechanism, a flame welding mechanism, and a cooling mechanism. The flame welding structure includes a flow divider connected to a set of flame jet pipes, which are evenly distributed around the outside of the corresponding pipe positioning seats. The number of flow dividers is equal to the number of pipe positioning seats in the set of pipe positioning seats.

[0011] After initial pressing, the exhaust pipe is fed into one of the pipe positioning seats on the turntable via the first feeding mechanism. Driven by the servo motor, the turntable rotates through a certain angle and pauses for a period of time. The duration of the pause depends on the time required for flame welding at this station. The angle that the turntable rotates through each time is 360° / N, where N is the number of pipe positioning seats on the turntable.

[0012] The exhaust pipe enters one of the pipe positioning seats on the turntable, then passes through the flux addition mechanism, which adds flux to the exhaust pipe. Next, the exhaust pipe enters the flame welding mechanism, where the flame jet heats the exterior of the exhaust pipe, melting the welding wire inside and achieving a weld. The exhaust pipe then enters the cooling mechanism for cooling, and after cooling, it enters another feeding mechanism, which removes the welded exhaust pipe, detaching it from the turntable and pipe positioning seats. This equipment allows for automated welding of the exhaust pipe, reducing manual intervention, increasing the stability of the weld quality, and improving welding efficiency.

[0013] As a preferred embodiment of the present invention, the feeding mechanism includes a servo linear module arranged radially above one end of the turntable. A first connecting seat is fixed on the slider of the linear module, a first telescopic cylinder is fixed on the first connecting seat, a first gripper cylinder is fixed on the telescopic rod of the first telescopic cylinder, the servo linear module is fixed on the frame, and the controller controls the servo linear module, the first telescopic cylinder and the first gripper cylinder.

[0014] The servo linear module can drive the first telescopic cylinder to move radially, and the first telescopic cylinder can drive the first gripper cylinder to move up or down. The first gripper cylinder can clamp or release the exhaust pipe. Through the cooperation of the first telescopic cylinder, the servo linear module and the second gripper cylinder, the clamping and transfer of the exhaust pipe can be realized.

[0015] As a preferred embodiment of the present invention, a feeding mechanism is provided on one side of the upstream feeding mechanism; The feeding mechanism includes a feeding channel, a vibrating plate connected to the upstream side of the feeding channel, and a rectangular channel connected to the downstream side of the feeding channel. A rectangular slider is fitted inside the rectangular channel and has a receiving port facing the feeding channel. The rectangular slider is connected to a second telescopic cylinder that drives it to move horizontally. A third telescopic cylinder is vertically arranged below the rectangular slider, and a stepped top rod is fixed to the end of the telescopic rod of the third telescopic cylinder. The inner side of the third telescopic cylinder is provided with a fourth telescopic cylinder arranged parallel to it. The end of the telescopic rod of the fourth telescopic cylinder is fixed with a pipe lifting seat. A rotating cylinder is provided between the third and fourth telescopic cylinders. The rotating block of the rotating cylinder is fixed to one end of the tilting frame. The other end of the tilting frame is fixed with a second gripper cylinder. The second gripper cylinder can move above the third and fourth telescopic cylinders. The third and fourth telescopic cylinders are fixed on the frame. The controller controls the second, third, and fourth telescopic cylinders, the rotating cylinder, and the second gripper cylinder.

[0016] Because the exhaust pipe needs to be rotated 180° to enter the turntable for welding, the exhaust pipe, after being conditioned by the vibratory feeder, enters the feeding channel. The second telescopic cylinder drives the rectangular slider to move. After the receiving port of the rectangular slider is aligned with the downstream end of the feeding channel, the exhaust pipe on the downstream side of the feeding channel enters the receiving port. Then, the second telescopic cylinder drives the rectangular slider to move back to its original position. At this time, the exhaust pipe on the rectangular slider moves to directly above the stepped top rod, while one side wall of the rectangular slider blocks the material being fed to the outlet. Then, the third telescopic cylinder drives the stepped top rod to move upward. The stepped top rod inserts into the lower end of the exhaust pipe and moves the exhaust pipe upward a certain distance through the stepped surface. Then, the second gripper cylinder clamps the exhaust pipe on the step top rod, the third telescopic cylinder drives the step top rod to move down and reset, the rotary cylinder drives the flipping frame to rotate 180°, so that the second gripper cylinder and the exhaust pipe also flip 180°, and the exhaust pipe is inserted into the pipe lifting seat. Then, the fourth telescopic cylinder drives the pipe lifting seat to move up, so that the flipped exhaust pipe is moved up a certain distance. Then, the first telescopic cylinder drives the first gripper cylinder to move down, the first gripper cylinder clamps the exhaust pipe and moves up to reset. Then, the servo linear module moves the first telescopic cylinder to the top of the corresponding pipe positioning seat, the second telescopic cylinder drives the second gripper to move down again, the second gripper drives the exhaust pipe to move down and insert it into the pipe positioning seat.

[0017] According to the above technical solution, the exhaust pipe can be automatically flipped and positioned, which facilitates subsequent feeding and welding operations.

[0018] As a preferred embodiment of the present invention, each group of pipe positioning seats has two pipe positioning seats. This allows for the processing of two exhaust pipes at once, doubling the welding efficiency of the exhaust pipes. Simultaneously, two sets of corresponding feeding mechanisms are also arranged in parallel, and two sets of second gripper cylinders, etc., are also provided on each feeding mechanism.

[0019] In a preferred embodiment of the present invention, the flux adding mechanism includes a feeding pipe, the outlet end of which faces downward at an angle to a corresponding pipe positioning seat, and the other end of the feeding pipe is connected to a liquid pump, which is controlled by a controller. The liquid pump contains liquid flux, which is pumped into the feeding pipe and then sprayed or dripped from the opening of the feeding pipe onto the welding portion of the exhaust pipe.

[0020] As a preferred embodiment of the present invention, the flame welding structure comprises two flame welding mechanisms arranged adjacent to each other. The exhaust pipe on the turntable passes sequentially through the two flame welding mechanisms. The first flame welding mechanism preheats the exhaust pipe, and the second flame welding mechanism reheats the exhaust pipe and melts the welding rod at the welding point of the exhaust pipe. By using two flame welding mechanisms (i.e., two workstations) to heat the exhaust pipe in stages, the heating time of the exhaust pipe at a single workstation can be reduced, thereby further increasing the frequency of the intermittent rotation of the entire turntable and thus significantly improving the welding efficiency of the exhaust pipe.

[0021] In a preferred embodiment of the present invention, the flow divider is connected to the mixing chamber via a connecting pipe, the mixing chamber is fixed on a welding bracket, and the welding bracket is fixedly connected to the frame; the mixing chamber is connected to a combustible gas (such as acetylene, gas, etc.) cylinder and an oxygen cylinder; The middle section of the connecting pipe is formed with a corrugated pipe. By setting the corrugated pipe section, the separator can rotate within a small angle to adapt to the stress of the gas pressure reaction in the flame jet tube on the distributor. At the same time, by slightly shaking and rotating, the flame jet tube can be driven to shake and rotate proportionally, which can make the flame jet tube heat the heating tube more evenly.

[0022] As a preferred embodiment of the present invention, the cooling mechanism includes a plurality of air-cooled pipes and a plurality of liquid-cooled pipes, the number of each of the air-cooled pipes and the liquid-cooled pipes being equal to the number of pipe positioning seats in a set of pipe positioning seats; the air-cooled pipes are connected to a high-pressure air source; the liquid-cooled pipes are connected to a coolant circulation mechanism. The air-cooled pipe is located upstream of the liquid-cooled pipe.

[0023] The above technical solution involves first air cooling and then liquid cooling of the exhaust pipe after flame heating. This avoids the problem of low efficiency caused by single air cooling and solves the defects such as stress and cracking that are easily caused by single liquid cooling.

[0024] After welding, the welded parts are in a high-temperature state (usually exceeding 1000℃, i.e., the austenitizing temperature of the material), which is the critical period for microstructure formation and stress generation: Pre-cooling with air can avoid sudden cooling stress: the cooling rate of air cooling is about 5-20℃ / s, which is "slow cooling". It can gradually reduce the temperature difference between the welding area (high temperature) and the base material (normal temperature), and prevent "thermal shock stress" from being generated in the weld and heat-affected zone (HAZ) due to excessive thermal expansion and contraction, thereby reducing the risk of cracking from the source.

[0025] Pre-cooling with air can optimize the initial microstructure: At high temperatures, material grains tend to grow rapidly, while air cooling can slowly lower the temperature, giving the grains "time to refine" and avoiding the problems of "coarse grains + hard and brittle phases" caused by liquid cooling alone.

[0026] Pre-cooling with air can reduce surface damage: When high-temperature parts come into direct contact with liquids (such as cold water), the surface is prone to developing "quenching spots" or oxide scale due to the "vapor film effect"; pre-cooling with air can lower the temperature to a range where "the liquid medium will not vaporize instantly" (such as 600-400℃), thus protecting the surface quality.

[0027] After air cooling lowers the temperature of the welded parts to the medium-low temperature range (300-500℃), it switches to liquid cooling (cooling rate approximately 20-100℃ / s). Its core function is: Post-liquid cooling can suppress harmful phase transformations: Liquid cooling can quickly reduce the temperature below the phase transformation termination temperature (such as the Ms point, the martensite transformation start temperature), reducing the precipitation of soft phases. At the same time, by controlling the cooling rate, strong and tough structures such as "fine-grained martensite" or "bainite" can be obtained (the structure strength is increased by 20%-50% compared to single air cooling, depending on the material).

[0028] Liquid cooling can shorten the production cycle: Although air cooling is gentle, it is inefficient (a single air cooling of thick-walled parts may take several hours); liquid cooling can quickly cool down in the "low-risk medium and low temperature stage", and the overall cooling time is reduced by more than 50% compared with single air cooling, which is especially suitable for mass production scenarios.

[0029] Post-liquid cooling can reduce the accumulation of internal stress: the plasticity of the material in the medium and low temperature range has been restored (the plasticity is good at high temperature and the stress is easy to release; the plasticity is moderate at medium and low temperature, and rapid cooling can avoid the slow accumulation of stress). At this time, the "additional stress" generated by liquid cooling is much less than that generated by direct liquid cooling at high temperature, and can be further eliminated by subsequent slight aging treatment. In the end, the residual stress is reduced by 30%-60% compared with single liquid cooling.

[0030] As a preferred embodiment of the present invention, the air-cooling pipe is connected to a high-pressure nitrogen source.

[0031] The core advantage of nitrogen gas cooling is that it balances cooling effect with protection of welded parts. It retains the basic advantage of gas cooling in "slow cooling and crack prevention" while avoiding problems such as oxidation and nitriding through the inert properties of nitrogen. It can also be adapted to a variety of material scenarios.

[0032] As a preferred embodiment of the present invention, the tube positioning seat includes a hollow tube fixed on a turntable, and a stepped hollow shaft communicating with its inner cavity is fixed at the upper end of the hollow tube. The hollow tube is connected to a nitrogen pipe, which is connected to a distribution tank fixed in the middle of the turntable. The distribution tank is connected to a high-pressure nitrogen source.

[0033] Nitrogen is supplied to the distribution tank via a high-pressure nitrogen source. The distribution tank injects nitrogen into the hollow tube through a nitrogen pipe, and then overflows into the surrounding environment of the exhaust pipe through a stepped hollow shaft, which can protect the exhaust pipe during the heating process.

[0034] The outstanding effects of this invention are: Compared with existing technologies, this technology integrates automatic feeding, precise positioning, flux addition, flame welding, scientific cooling, and automatic unloading, realizing fully automated production of exhaust pipe welding, greatly reducing manual intervention and improving production efficiency.

[0035] By using precise intermittent rotation of the turntable, uniform heating from the Togo flame jet tube, and preheating and welding staged heating processes, the consistency of heating parameters for each workpiece is ensured, significantly improving the stability of welding quality and the product qualification rate.

[0036] The feeding mechanism works in conjunction with the material delivery mechanism to achieve automatic transfer and necessary posture rotation of the exhaust pipe through a series of automated actions such as rectangular slider receiving, stepped top rod lifting, and second gripper cylinder flipping, thus meeting the requirements of welding fixtures.

[0037] A composite cooling method of first air cooling and then liquid cooling is adopted. First, the air cooling pipes are used for slow cooling to avoid thermal shock stress and surface damage. Then, the liquid cooling pipes are used for rapid cooling to suppress harmful phase transformation and shorten the production cycle. A good balance is achieved between ensuring the microstructure and properties of the welded joint and reducing internal stress.

[0038] By introducing nitrogen gas into the hollow tube and stepped hollow shaft of the tube positioning seat, a local protective atmosphere can be formed in the heating area of ​​the exhaust pipe, which can effectively prevent high-temperature oxidation and further improve the welding quality.

[0039] By setting up multiple workstations and parallel tube positioning seats, multiple workpieces can be processed simultaneously or in parallel. The turntable moves intermittently and works in coordination with various mechanisms, resulting in a short cycle time and high production capacity. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A magnified view of a specific area (A); Figure 3 for Figure 1 A magnified view of a portion of B; Figure 4 This is a top view of the present invention; Figure 5 for Figure 4 A magnified view of a portion of C; Figure 6 This is a schematic diagram of the flame welding mechanism of the present invention.

[0041] Reference numerals: 1. Frame; 21. Turntable; 22. Pipe positioning seat; 221. Hollow tube; 222. Stepped hollow shaft; 23. Nitrogen pipe; 24. Diverter; 3. Feeding mechanism; 31. Servo linear module; 32. First connecting seat; 33. First telescopic cylinder; 34. First gripper cylinder; 4. Flux adding mechanism; 41. Feeding pipe; 42. Pump; 5. Flame welding mechanism; 51. Diverter; 52. Flame jet pipe; 53. Connecting pipe; 54. Mixing chamber; 55. Welding bracket; 56. Corrugated pipe; 6. Cooling mechanism; 61. Air-cooled pipe; 62. Liquid-cooled pipe; 8. Feeding mechanism; 81. Feeding channel; 82. Rectangular channel; 83. Rectangular slider; 84. Second telescopic cylinder; 85. Third telescopic cylinder; 86. Stepped top rod; 87. Fourth telescopic cylinder; 88. Pipe lifting seat; 89. Tilting frame; 810. Second gripper cylinder; 811. Rotary cylinder; 821. Material receiving port; 9. Exhaust pipe. Detailed Implementation

[0042] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0043] The following is for reference Figures 1 to 6 The present invention will be described as follows: A fully automatic exhaust pipe flame welding machine, such as Figure 1 As shown, the system includes a frame 1. A turntable 21, capable of intermittent rotation, is connected to the frame 1 via bearings and other structures. A servo motor (not shown) is connected to the bottom of the turntable 21, and the servo motor drives the turntable 21 to rotate precisely in increments via a reducer or similar means. Multiple sets (e.g., eight sets) of circumferentially distributed pipe positioning seats 22 are fixed on the turntable 21. In this embodiment, each set of pipe positioning seats 22 consists of two seats, used to simultaneously position two exhaust pipes.

[0044] Along the rotation direction of the turntable 21, the frame 1 is sequentially equipped with two feeding mechanisms 3, a flux adding mechanism 4, a flame welding mechanism 5, and a cooling mechanism 6. The feeding mechanism 3 located on the upstream side is used to place the exhaust pipe to be welded onto the pipe positioning seat 22 of the turntable 21, and the feeding mechanism 3 located on the downstream side is used to remove the cooled exhaust pipe from the pipe positioning seat 22. The two feeding mechanisms 3 have identical structures. A controller (such as a PLC) coordinates and controls the actions of each mechanism.

[0045] like Figure 2 As shown, the feeding mechanism 3 includes a servo linear module 31 fixed to the frame 1 by a bracket, and a first connecting seat 32 fixed on its slider. A vertical first telescopic cylinder 33 (such as a cylinder) is fixed on the first connecting seat 32, and a first gripper cylinder 34 is fixed to the lower end of the piston rod of the first telescopic cylinder 33.

[0046] like Figure 3 , Figure 4 , Figure 5 As shown, a feeding mechanism 8 is provided next to the feeding mechanism 3 on the upstream side. The feeding mechanism 8 includes a feeding channel 81 connected to a vibratory feeder (not shown). The downstream of the feeding channel 81 is connected to a rectangular channel 82. A rectangular slider 83 is slidably fitted inside the rectangular channel 82, and a receiving port 831 is opened on the rectangular slider 83. A second telescopic cylinder 84 drives the rectangular slider 83 to reciprocate. A third telescopic cylinder 85 is provided below the rectangular slider 83, and a stepped top rod 86 is fixed to the end of its piston rod. A fourth telescopic cylinder 87 is provided adjacent to the third telescopic cylinder 85, and a tube lifting seat 88 is fixed to the end of its piston rod. A rotary cylinder 811 is provided between the third telescopic cylinder 85 and the fourth telescopic cylinder 87, and a flipping frame 89 is fixed on its rotary block. A second gripper cylinder 810 is fixed to the other end of the flipping frame 89.

[0047] Working process: The vibratory feeder sorts and feeds the exhaust pipes 9 into the feeding channel 81. The second telescopic cylinder 84 pushes the rectangular slider 83 to align the receiving port 831 with the outlet of the feeding channel, and one exhaust pipe enters the receiving port 831. The second telescopic cylinder 84 retracts, and the rectangular slider 83 moves the exhaust pipe above the stepped top rod 86. The third telescopic cylinder 85 lifts, and the stepped top rod 86 inserts into the lower end of the exhaust pipe and lifts it up. The second gripper cylinder 810 clamps the exhaust pipe, and the third telescopic cylinder 85 descends to reset. The rotary cylinder 811 drives the tilting frame 89 to rotate 180°, so that the exhaust pipe is inverted and aligned with the pipe lifting seat 88. The second gripper cylinder 810 releases, and the exhaust pipe falls into the pipe lifting seat 88. The fourth telescopic cylinder 87 lifts, raising the exhaust pipe to the ready-to-receive position. The first telescopic cylinder 33 of the upstream feeding mechanism 3 descends, the first gripper cylinder 34 grips the exhaust pipe and rises, and the servo linear module 31 moves it to the corresponding empty pipe positioning seat 22 on the turntable 21 and places it in.

[0048] Turntable 21 rotates intermittently. For example... Figure 1 As shown, the exhaust pipe first passes through the flux addition mechanism 4. The flux addition mechanism 4 includes a feeding pipe 41 and a pump 42. The pump 42 pumps out liquid flux, which is then dripped or sprayed onto the part of the exhaust pipe to be soldered through the feeding pipe 41.

[0049] Next, the exhaust pipe enters the flame welding mechanism 5. The flame welding mechanism 5 includes a welding support 55, which is fixed to the frame 1. The mixing chamber 54 of the welding support 55 is connected to an acetylene cylinder and an oxygen cylinder (not shown) via pipes. The mixing chamber 54 is connected to a distributor 51 via a connecting pipe 53. A corrugated pipe 56 is provided in the middle section of the connecting pipe 53, such as... Figure 6As shown. The distributor 51 connects to a group (four in this embodiment) of circumferentially distributed flame jet pipes 52, each flame jet pipe 52 aligning with and heating the exhaust pipe welding area on a pipe positioning seat 22. Preferably, two adjacent flame welding mechanisms 5 are provided, the first for preheating and the second for final heating to melt the welding wire. The bellows 56 allows the distributor 51 to sway slightly, making the flame heating more uniform.

[0050] After welding is completed, the exhaust pipe enters the cooling mechanism 6. (As follows) Figure 1 As shown, the cooling mechanism 6 includes multiple air-cooling pipes 61 located upstream and multiple liquid-cooling pipes 62 located downstream. The air-cooling pipes 61 are connected to a high-pressure nitrogen source to provide initial slow cooling to the high-temperature workpiece. The liquid-cooling pipes 62 are connected to a coolant circulation system (such as a water pump, water tank, or heat exchanger) to rapidly cool the workpiece after air cooling.

[0051] Finally, the welded and cooled exhaust pipe is rotated by the turntable 21 to the downstream feeding mechanism 3 station, where the first gripper cylinder 34 of the feeding mechanism 3 clamps it from the pipe positioning seat 22 and moves it to the unloading area through the servo linear module 31 to complete the unloading.

[0052] like Figure 4 , Figure 6 As shown, the pipe positioning seat 22 includes a hollow pipe 221 fixed on the turntable 21, with a stepped hollow shaft 222 fixed to its upper end. The hollow pipe 221 is connected to a distribution tank 24 in the middle of the turntable 21 via a nitrogen pipe 23, and the distribution tank 24 is connected to a high-pressure nitrogen source. Nitrogen overflows from the stepped hollow shaft 222 through this passage, forming a local protective atmosphere in the heating area of ​​the exhaust pipe to prevent oxidation.

[0053] The working cycle of this invention is precisely controlled by a controller, realizing fully automated, high-quality, and efficient production of exhaust pipe welding.

[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications assumed above should also be considered within the scope of protection of the present invention.

Claims

1. A fully automatic exhaust pipe flame welding machine, comprising a frame (1), characterized in that: The frame (1) is connected to a turntable (21) that can rotate intermittently, and multiple sets of circumferentially distributed tube positioning seats (22) are fixed on the turntable (21). The frame (1) is provided with two adjacent feeding mechanisms (3), a flux adding mechanism (4), a flame welding mechanism (5), and a cooling mechanism (6). The flame welding structure (5) includes a distributor (51), which is connected to a set of flame jet pipes (52). The set of flame jet pipes (52) are evenly distributed around the outside of the corresponding pipe positioning seat (22). The number of distributors (51) is equal to the number of pipe positioning seats (22) of the set of pipe positioning seats (22).

2. The fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: The feeding mechanism (3) includes a servo linear module (31) arranged radially above one end of the turntable (21). A first connecting seat (32) is fixed on the slider of the linear module (31). A first telescopic cylinder (33) is fixed on the first connecting seat (32) and a first gripper cylinder (34) is fixed on the telescopic rod of the first telescopic cylinder (33).

3. The fully automatic exhaust pipe flame welding machine according to claim 2, characterized in that: A feeding mechanism (8) is provided on one side of the upstream feeding mechanism (3); The feeding mechanism (8) includes a feeding channel (81), the downstream side of which is connected to a rectangular channel (82). A rectangular slider (83) is fitted inside the rectangular channel (82) and has a receiving port (831) facing the feeding channel (81). The rectangular slider (83) is connected to a second telescopic cylinder (84) that drives it to move horizontally. A third telescopic cylinder (85) is vertically arranged below the rectangular slider (83), and a stepped top rod (86) is fixed to the end of the telescopic rod of the third telescopic cylinder (85). The inner side of the third telescopic cylinder (85) is provided with a fourth telescopic cylinder (87) arranged parallel to it. The end of the telescopic rod of the fourth telescopic cylinder (87) is fixed with a pipe lifting seat (88). A rotating cylinder (811) is provided between the third telescopic cylinder (85) and the fourth telescopic cylinder (87). The rotating block of the rotating cylinder (811) is fixed to one end of the flipping frame (89), and the other end of the flipping frame (89) is fixed with a second gripper cylinder (810).

4. The fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: Each set of tube positioning seats (22) has two tube positioning seats.

5. The fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: The flux addition mechanism (4) includes a feeding pipe (41), the outlet end of the feeding pipe (41) faces downward at an angle to a corresponding pipe positioning seat (22), and the other end of the feeding pipe (41) is connected to a pump (42).

6. The fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: The flame welding structure (5) is provided in two parts, and the two flame welding mechanisms (5) are arranged adjacent to each other.

7. The fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: The splitter (51) is connected to the mixing chamber (54) via a connecting pipe (53); The middle section of the connecting pipe (53) is formed with a corrugated pipe (56).

8. The fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: The cooling mechanism (6) includes multiple air-cooled pipes (61) and multiple liquid-cooled pipes (62), the number of air-cooled pipes (61) and liquid-cooled pipes (62) being equal to the number of pipe positioning seats (22) in a set of pipe positioning seats (22); The air-cooled pipe (61) is located on the upstream side of the liquid-cooled pipe (62).

9. A fully automatic exhaust pipe flame welding machine according to claim 8, characterized in that: The air-cooling pipe (61) is connected to a high-pressure nitrogen source.

10. A fully automatic exhaust pipe flame welding machine according to claim 1, characterized in that: The tube positioning seat (22) includes a hollow tube (221) fixed on the turntable (21), and a stepped hollow shaft (222) communicating with its inner cavity is fixed at the upper end of the hollow tube (221). The hollow tube (221) is connected to a nitrogen pipe (23), which is connected to a diversion tank (24) fixed in the middle of the turntable (21). The diversion tank (24) is connected to a high-pressure nitrogen source.

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