Repair of the hammer base hook after forging repair Li Xiaoyan (Baoqin Co., Ltd. forging factory in Shaanxi Baoji) is equipped with a forging hammer head 3t. In use, the hook mating surface wear gap is large, the guide rails on both sides of the guide rail are damaged, the cylinder is in The speed is unstable during the telescopic process, causing a large angle of deflection between the upper and lower hooks. Due to the limited field of view of the operator, the operation is faulty, and the broken position is as shown, causing the base to continue to be used.
The integral hook base must have a certain strength and stability to meet the usual production needs. The position of the hook on the right side of the base is broken, and it cannot be effectively repaired by the repair welding method or the screw connection method. Considering that there will be a certain collision in the telescope during operation, and there will be a gap, improve the W74 compressor piston ring by the flattening position of the solid slope shown in the figure. Guo Jilong Lu Huiping Sun Tianling (China Petroleum Tuha Oilfield Company Yanshan Oil Production Plant Xinjiang Good) 5 US Cooper 16SGT/W74 units for the lifting of light hydrocarbon processes. Compressor model W74 adopts symmetric balanced two-stage compression, four compression cylinders are arranged on both sides, the compressor adopts aluminum piston, and the piston ring and support ring material is Teflon.
In use, premature wear of the piston ring groove and seal ring occurs.
The intake of one side of the W74 compressor and the exhaust of one side are simultaneously performed, that is, double acting. Each piston has two sealed piston rings and a track support ring. On-site observation found that both the piston ring groove and the piston ring are worn outside. During each expansion, suction compression and exhaust of the piston, the gap between the two piston rings creates a trapped high-pressure gas space (first half). Partially, in the direction of the piston movement, when the first piston ring is sealed, a large pressure difference is generated on both sides of the second piston ring, and the trapped high-pressure gas flows down the piston ring to the low-pressure end. Reload and pull out again to see if the loading roller and the roller are normal. Also observe whether the upper and lower flat sleeves and the shaft clamping device adjustment block are normal, otherwise adjust.
The replacement of the shaft sleeve by this scheme greatly shortens the replacement period, and the time taken to replace the single flat head sleeve is 6 hours. The disassembly and assembly work is small, the labor intensity is reduced, and it is safe and reliable.
[Edit Li Wen] The lateral force generated causes the piston ring to rotate in the groove, causing the piston ring and the outer wall of the ring groove to wear more.
Three shallow grooves (lower half) are radially opened on the outer side of the piston ring, so that during the movement of the piston, the high-pressure gas between the two sealed piston rings is quickly relieved to the low pressure side, and the sides of the piston ring are reduced as much as possible. Pressure difference, reducing friction. In addition, a small hole with a diameter of 3~4mm is drilled at the bottom of the piston ring for mounting the positioning pin, and the piston ring is restricted from rotating in the circumferential direction without affecting the lateral movement of the piston ring, thereby avoiding lateral wear of the piston ring.
After field testing, the wear of the piston ring and the ring groove is effectively improved, and the service life of the piston ring is improved. It is worth noting that the pressure relief groove cannot be opened too much to avoid affecting the strength of the piston ring. Generally, it does not exceed 1/8 of the width of the piston ring. The positioning pin does not affect the lateral movement of the piston ring, so as not to weaken the piston ring sealing effect.
[Edit Li Wen] Equipment Management and Maintenance 2014No2
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