34results about How to "Improve job safety and reliability" patented technology

The invention relates to the technical field of valves, in particular to a vacuum breaker valve, namely a negative pressure siphoning backflow vacuum valve comprising a valve body. The left side of the valve body is provided with a first pipe orifice used for being connected with an upstream water pipe; the right side of the valve body is provided with a second pipe orifice used for being connected with a downstream water pipe. The valve body is provided with a hollow cavity inside. The negative pressure siphoning backflow vacuum valve further comprises a cover plate with T-shaped longitudinal section; the cover plate comprises a transverse plate and a vertical plate; the transverse plate is arranged inside the hollow cavity; the bottom of the hollow cavity is provided with an opening; the vertical plate extends out of the opening; the cover plate can move up and down along the opening; the bottom of the hollow cavity is further provided with a suction hole outside the opening; the transverse plate can cover and close the suction hole. The negative pressure siphoning backflow vacuum valve is capable of safely operating and high in reliability; when in normal use, the valve has good sealing performance and is free of water leakage; during air supply, the cover plate is flexible and the volume of air supply is high; operational control is not required, operation is fully automated, atmospheric pressure is used as a power source, and connecting other power sources is not required. The negative pressure siphoning backflow vacuum valve is installed with no need for debugging.

Provided is a defensive grappling device. The clamp cuff end and the force exertion end of each clamp cuff are bent towards the same side, and the bending points are coaxial hinge points of the left and right clamp cuffs and a substrate; when a left clamp cuff force exertion end and a right clamp cuff force exertion end are formed and are closed inwards after the left clamp cuff is hinged to the right clamp cuff, the clamp cuff ends are of an outward opening structure; a middle rod is fixedly provided with a push-pull rod, the push-pull rod extends into the substrate and is connected with the substrate to form a sliding structure, and the section, extending into the substrate, of the push-pull rod is provided with four inhaul cable control line fixing ends which are used for fixing end sockets of two inhaul cable control lines; the clamp cuff force exertion ends are provided with pulleys, and each inhaul cable control line is connected with the pulley of one of the clamp cuff force exertion ends, so that when the push-pull rod moves outwards towards the substrate, the inhaul cable control lines drive the clamp cuff force exertion ends to be closed inwards and the clamp cuffs are opened, and when the push-pull rod moves inwards towards the substrate, the inhaul cable control lines 21 drive the clamp cuff force exertion ends to be opened outwards and the clamp cuff ends are clamped closely. The defensive grappling device has the advantages that the structure is simple and practical, the device is well stressed, in the opening or closing process of the clamp cuffs, the formed brake control effect is good, and work safety and reliability are high.

The invention discloses a manufacturing method of a high anti-fatigue bolt. The manufacturing method comprises the following steps: a bolt provided with a head part, a rod part and a thread section is machined by adopting a tampering forming method, when threads of the thread section are machined, firstly a transition section is machined on the rod part, and positioned between the thread section and the rod part, the maximum diameter of the transition section is smaller than the outer diameter of the thread of the thread section and the diameter of the rod part, threads with needed standard thread pitch are rolled on the thread section by adopting a thread rolling wheel, when the threads are rolled, ending threads at a position where the thread section and the transition section are connected are of incomplete threads, namely the thread pitch of the ending threads is smaller than or equal to half of the standard thread pitch on the thread section. The bolt has the advantages of being high in anti-fatigue strength, small in size and light in weight, and the manufacturing method has the advantages of being simple in technology, lower in manufacturing cost, fast to produce, high in working safety and reliability, convenient to both use and maintain and the like.