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31results about How to "Reduce or eliminate impact" patented technology

Control method for coal impact disasters in coal mining

InactiveCN105422173AReduce or eliminate slip instabilityReduce or eliminate impactMining devicesCoal miningINCREASED EFFECT
The invention discloses a control method for coal impact disasters in coal mining. The method includes the specific steps of A, determining the friction resistance coefficient, wherein the friction coefficient of a coal sample and a top and bottom plate rock sample is determined through the laboratory attaching and sliding experiments and ratio calculation; B, determining the field implementation related parameter, wherein the drilling size, depth and the amount of water required to be injected and fine-grained coal rock powder or the amount of other lubricating materials are determined, and therefore the friction coefficient mu detected in a laboratory is decreased; C, conducting field implementation, wherein implementation is conducted in two tunnels before coal recovery according to the experiments and calculation conditions; D, conducting effect tests, wherein the slide increasing effect is determined, and related parameters for implementing slide increasing means again are determined according to the monitor effect. When pressure is exerted on top and bottom plates, coal can be made to slide relative to the top and bottom plate rock layers, the elastic performance accumulation in the coal is reduced, and therefore the probability that coal slides to lose stability or is broken and smashed is effectively lowered or eliminated.
Owner:CHINA UNIV OF MINING & TECH

Hydraulic impact-preventive screw drill

The invention discloses a hydraulic impact-preventive screw drill. The hydraulic impact-preventive screw drill comprises a transmission shaft; a liquid hole is axially formed at the inner part of the transmission shaft; an upper limiting sleeve pipe is arranged in match with the outer side of the transmission shaft by a sleeving manner; a shaft end sleeve barrel which sleeves the outside of the transmission shaft through a spline is connected to the upper limiting sleeve pipe; a sealing sleeve pipe and an elastic buffering sleeve ring, which are tightly arranged at the outside of the transmission shaft by the sleeving manner, are arranged below the shaft end sleeve barrel; an elastic peripheral edge sleeve, which is mounted at the outside of the lower limiting sleeve pipe by the sleeving manner, is integrally connected with the peripheral side of the elastic buffering sleeve ring; a buffering sleeve pipe is connected in match with the lower end of the shaft end sleeve barrel; a hydraulic buffering cavity is axially formed in the upper part of the buffering sleeve pipe. According to the hydraulic impact-preventive screw drill, the liquid-based buffering and guide mode is adopted, which can effectively reduce or remove bit bouncing and impact vibration, the protection effect dynamically acts all the times, and therefore, the damage to a drill and a drill bit can be reduced, the connection of a drill collar and the completeness of the well wall are protected, and the service life of the whole drill is prolonged; in addition, the well drilling safety is improved.
Owner:潍坊盛德石油机械制造有限公司

Impact-resistant screw drill tool

The invention discloses an impact-resistant screw drill tool, comprising a screw drill outer shell, wherein the screw drill outer shell is internally and rotatably provided with a transmission shaft, the lower end of the transmission shaft stretches out of the screw drill outer shell, the lower end part of the transmission shaft is sheathed with a cushion collar provided with a drilling head, the transmission shaft and the cushion collar are in spline fit, the transmission shaft is provided with a cushion limiting device used for limiting the axial moving range of the cushion collar, an axial elastic cushioning device is arranged between the transmission shaft and the cushion collar, and the fit clearance of the transmission shaft and the cushion collar is provided with a sealing device. In the invention, the axial elastic cushioning device is arranged between the transmission shaft and the cushioning collar, which alleviates or eliminates bit jumping and impact shock generated when drilling is carried out at the bottom layer of bit jumping, reduces damages of the drill tool and the drilling head, protects the connection of a drill collar and the completeness of a well wall, prolongs the overall service life of the drill tool, and enhances the safety and the speed of well drilling.
Owner:潍坊盛德石油机械制造有限公司

Hydro jet pump barrel

The invention discloses a pump barrel of a hydraulic jet pump, which belongs to the technical field of oil and gas field exploitation technology. The pump cylinder of the hydraulic jet pump is detachably connected to the upper section of the second cylinder through the lower section of the first cylinder, which facilitates putting the buffer cylinder into the cylinder cavity of the first cylinder and the second cylinder. The inner wall of the lower section of the cylinder and / or the inner wall of the upper section of the second cylinder is provided with a groove of a predetermined length, and the wall of the buffer cylinder is provided with an annular protruding ring, and the annular protruding ring is movably snapped into the groove Inside, the first elastic buffer device is sleeved on the buffer cylinder, one end of the first elastic buffer device abuts against the lower edge of the groove, and the other end of the first elastic buffer device abuts against the lower end of the annular bead, so that When the pump core is seated into the pump barrel under the impulse of high-pressure water, the pump core can be set and sealed on the buffer barrel, and the buffering effect of the first elastic buffer device can reduce or eliminate the impact force on the pump barrel and the tubing buckle, preventing The pump barrel and hose buckle are damaged.
Owner:PETROCHINA CO LTD

Method and apparatus for detecting a short circuit

This invention provides a method and an apparatus for detecting a short-circuit occurring between a signal line and a ground line of a lead wire. The apparatus comprises a circuit and a resistive element. The circuit has an output terminal, an input terminal and ground. One end of the ground line is connected to the ground of the circuit, and the other end of the ground line is disconnected. A first terminal of the resistive element is connected to the output terminal of the circuit. One end of the signal line is connected to a second terminal of the resistive element, and the other end of the signal line is disconnected. The circuit is configured to provide a first voltage via the output terminal and obtain a second voltage via the input terminal connected to a joint of the signal line and the resistive element, to provide a third voltage via the output terminal and obtain a fourth voltage via the input terminal, to derive an impedance of the lead wire from the first voltage, the second voltage, the third voltage, the fourth voltage and an impedance of the resistive element, and to determine whether a short-circuit occurs or not, based on the impedance of the lead wire and a predefined impedance. In this way, the shorted lead wire can be detected with high accuracy.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
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