| 摘要 |
FIELD: blasting operations.SUBSTANCE: head consists of elliptical cylindrical box with its top slanted against head axis matching cylinder and hole axis. In the slant plane, box features cylindrical part for cap of H height and diameter exceeding large axis of ellipse. Cap bottom features cylinder with a hole for fixation of measuring elements. Lug for cable input installation is located at the box side of longer generatrix, and blocking device including hole with threaded bushing and screw installed inside it with screw cap fitting in cap slot is located at the opposite box side of shorter generatrix. End of cylindrical box part features recess for O-ring, and matching recess for the same O-ring is located at cap bottom, with semicircular slots along cap end circle behind the cap recess. Case recess features a lug larger that diameter of matching recess in cap, so that when cap is closed to a stop, an assured gap h is formed between top part of box slant and cap bottom. In second variant, glass is installed in gap h on a spring ring placed in cap slot with sealing gasket, and cap bottom features inspection window.EFFECT: enhanced operation reliability in areas of explosion hazard, streamlined manufacturing, erection and operation, convenient calibration and repair.2 cl, 6 dwg |
