Zeng Huilin U Liu Ran U Zhao Yongqiang 3 Ma Zhifeng U Yintie U 1. China Academy of Petroleum and Natural Gas Pipelines; 2. National Engineering Laboratory for Oil and Gas Pipeline Transportation Safety; 3. The Third Engineering Branch of China Petroleum and Natural Gas Pipeline Bureau restricts efficiency In-depth development of welding technology. This PIW series pipe inner ring seam automatic welding machine integrates mechanical, electrical control and pneumatic. The structure design of the butt system and welding system can achieve the centralized completion of pipe pairing and root welding in the welding process of large-diameter pipes. . The engineering application confirms that PIW series pipeline internal girth automatic welding machine has the characteristics of fast welding speed, good quality and high efficiency, which can solve the root welding problem of the pipeline well and meet the needs of the existing pipeline efficient welding construction for the quality of root welding. The localization of PIW series pipeline internal seam automatic welding machine not only broke the bottleneck of the development of efficient welding technology, but also broke the technical blockade and price monopoly of similar foreign products, effectively improving the technical level and economic benefits of pipeline construction in China. With the pursuit of high-efficiency welding and the longevity of pipeline life in the construction of long-distance pipelines, one of the key links in the welding process has attracted more and more attention. Its welding quality and welding speed restrict the in-depth development of efficient welding technology. How to quickly perform root welding on the premise of ensuring the welding quality has become an urgent problem to be solved in the pipeline construction project. Under this background, the PIW series pipeline inner ring seam automatic welding machine was developed and achieved localization, which not only broke the bottleneck of the development of efficient welding technology, but also broke the technical blockade and price monopoly of similar foreign products, effectively improving our country The technical level and economic benefits of pipeline construction. The performance of PIW series pipeline inner ring seam automatic welding machine in the special welding unit, full digital automatic control technology, welding synchronous drive, synchronous positioning and other aspects is comparable to similar foreign products; while in wire feed speed self-detection, manual emergency stop brake, walking The performance of interlocking with brakes is better than similar foreign products, and has strong market competitiveness in domestic and international markets. 1 Structure and working principle PIW series pipeline inner ring seam automatic welding machine (hereinafter referred to as PIW internal welding machine) integrates mechanical, electronic control and pneumatic. Its structure design of the butt system and welding system can realize large-diameter pipeline During the welding construction, the nozzle pairing and root welding are concentrated. Structure The PIW internal welding machine adopts a horizontal long frame structure (,), which is mainly composed of a tensioning mechanism, an expansion guide protection device, a torch automatic positioning centering mechanism, a multi-torch synchronous welding drive mechanism, a special welding unit, walking The mechanism and brake mechanism, pneumatic system, automatic control system, etc., have the functions of walking in the tube, pairing of the nozzles, synchronous positioning of multiple welding torches, automatic rapid internal girth welding and so on. 6 or 8 dedicated welding units are evenly arranged on the rotating slip ring of the multi-torch synchronous welding drive mechanism. The torch automatic positioning centering mechanism ensures that the center of the welding unit and the welded pipe mouth are in the same plane. The automatic control system adopts DSP (digital signal processor) and CPLD (complex programmable logic chip) full digital motion control technology, and the control is reliable. Working principle The pneumatic motor drives the whole machine to walk in the tube, and it is necessary to walk until the group needs to innovate important products for China National Petroleum Corporation in 2011. Patent status: "Multi-weld head synchronous positioning mechanism for automatic pipe inner seam welding machine" (patent number: ZL03217443.8), multi-weld head synchronous drive mechanism for automatic pipe inner ring seam welding machine "(patent number: ZL03217441.1) 1. Special welding unit for automatic welding machine for inner circumferential seam of pipeline (patent number: ZL03217442.X), inner winding type rotating mechanism for inner welding machine of pipeline (patent number: ZL200820080678.5) won the national utility model patent. First: Zeng Huilin, born in 1965, graduated from the School of Materials Science and Technology of Tianjin University in 2008, received a doctorate, is a senior engineer, and is currently the director of the Construction Equipment Research Institute of China National Petroleum Pipeline Research Institute, mainly engaged in the construction of long-distance oil and gas pipelines and storage tanks Equipment research work. When the corresponding position of one end of the steel pipe of E-mailqq.com, walking stops, the brake device is started to lock the inner welding machine to prevent sliding in the pipe and affect the accuracy of the counterpart. At the same time, the tightening cylinder is activated to cause the expanding shoe to extend and tighten the inner wall of the tube. Another steel pipe that needs to be paired is moved closer to the inward welding machine by the pipe hanging machine. After the gap requirement of the nozzle group is met, the other row of expansion shoes of the inner welding machine extends and tightens the pipe wall to accurately realize the nozzle group Correct. The torch positioning and alignment mechanism ensures that the torch centers of all welding units are in the same plane and are accurately aligned with the weld seam. Then, start the control system to control all welding units to apply welding synchronously and independently until the root welding of the pipeline is completed. 1.3 Main technical parameters Applicable pipe diameter: 01016mm01219mm; number of pressing shoes: 18 X2; total tensioning force of tensioning mechanism: 140t; required working pressure of air compressor: 2.5MPa; walking speed: 060m / min welding speed: 01000mm / min ; Wire feed speed: 013000mm / min is suitable for welding wire diameter 00.8mm01.2mm (solid); air supply, air cut-off time: arbitrarily set. Praise. 3 Conclusion The on-site application confirmed that the piw series pipeline inner ring seam automatic welding machine has the characteristics of fast welding speed, good quality, high efficiency, simple operation, stable control, etc. It can solve the problem of pipeline root welding and meet the existing pipeline efficient welding The demand for root welding quality in construction coincides with the peak period of domestic pipeline construction, thus ensuring a good prospect for the promotion and application of this product. Since the oil and gas pipelines are currently developing in the direction of large diameter and large wall thickness, and the construction environment is complex and harsh, the previous internal welding machine's climbing ability in the pipeline and the flexibility of the nose part are slightly inadequate, and further work needs to be done Upgrade. The key direction of its improvement is to change the walking motor from a vane type to a plunger type to improve the driving force of the motor; change the driving mode from the bottom drive to the side drive to achieve the stability of the internal welding machine during the walking process; optimize the head Flexible structure, redesigned special deflection spring for the nose to increase the flexible deflection amplitude of the nose. 2 Experimental and industrial applications Indoor experiment and field pilot PIW internal welding machine prototype has undergone a large number of indoor experiments and simulated construction site tests during the development process. The overall performance is stable, the welding speed is fast, the weld is beautifully formed, and the mechanical properties are good. The requirements for root welding for efficient pipeline construction. The PIW internal welding machine for industrial applications has won the first prize for scientific and technological progress of the China National Petroleum Pipeline Bureau, and has obtained 4 patents for the synchronous positioning mechanism, synchronous drive mechanism, special welding unit, and cable inner winding rotating mechanism. The products have been used in pipeline projects such as the West-East Gas Pipeline, the Shaanxi-Beijing Double Line, the Second West Line, etc. The performance of the whole machine is good and stable, the welding speed is fast and the efficiency is high. Face Makeup,Makeup Eyeshadow,Concealer High Coverage,Liquid Foundation Suzhou Yimeijia368 Biological Technology Co.,Ltd. , https://www.yimeijiabeauty.com