常用气枪工作原理介绍

气枪具有结构简单、维修方便、性能可靠、环保的特点,已广泛应用于水网和海上石油勘探。本文介绍了BOLT气枪、SLEEVE气枪和G气枪的基本结构,阐述了它们的工作原理,对气枪在施工中的常见故障进行了分析,并给出了解决方法。     

BOLT气枪震源工作系统故障分析与应用的探讨

本文对BOLT气枪在地震勘探中的阵列方式、沉放深度及气枪的工作数量进行了探讨。对施工中可能出现的故障及其原因进行了详细地分析，为故障的排除提供了较好的途径。     

FEM stress analysis and sealing performance improvement of box-shaped bolted flanged joints using silicone sealant under internal pressure and thermal conduction conditions

Interface stresses and sealing performance of thin-wall box-shaped bolted flanged joints using silicone sealant under internal pressure and thermal conduction conditions are analyzed by the thermo-elastic finite element method. The flexible flanges were fastened by M8 bolts and nuts with an initial clamping force (bolt preload) after being joined with the silicone sealant. In the elastic and thermo-elastic Finite Element Method (FEM) calculations, the effects of the bolt pitch distance, flange rigidity and flange thickness were examined on the interface stress distributions. In addition, the effects of the linear thermal expansion coefficient and Young's modulus of the silicone sealant in the steady temperature state were also examined from a design standpoint. In the experiments, leakage pressure was measured when the silicone sealant was applied between an aluminum flexible flange with 1 mm thickness and an aluminum flange (body) with 10 mm thickness. Measurements of sealing performance with the silicone sealant and a sheet gasket were also conducted. In addition, strains in the joint in steady temperature states were also measured by strain gauges to understand the effect of the operative temperature on the sealing performance. The experimental results were found to be in fairly good agreement with the calculated results. From the results, it was found that the effect of the thermal conduction condition was greater than that of the internal pressure on both the interface stress distributions and the sealing performance. In addition, the sealing performance was found to be better in the joint with the silicone sealant than that with the sheet gasket.     

提高螺栓联接强度的施工安装措施

从螺栓联接安装的角度探讨了提高螺栓联接强度的措施。将螺检联接拧紧后，螺母略作松退，可降低螺杆中当量应力约16．5％，提高螺栓承载能力约1／6。