44results about How to "Reduce potential safety hazards" patented technology

The invention discloses a natural-gas pipe welding machine. The natural-gas pipe welding machine is structurally comprises a pipe locking structure, a welding head handle, a welding controller, a welding button, a welding-ring fixing rod, a welding ring, a motor, a fixing disc, a transmission, a rotating base, supporting rods, a transverse rod, a welding clamping base, fixing rings, connecting rods and clamping supporting rods, wherein the lower ends of the clamping supporting rods are connected with the left ends and the right ends of the connecting rods in an embedded mode, the right ends ofthe fixing rings and the clamping supporting rods are integrally formed, the left ends of the connecting rods penetrate through the inner walls of the fixing rings, the connecting rods are perpendicular to the left ends of the clamping supporting rods, and the lower ends of the supporting rods and the left end and the right end of the transverse rod are welded. According to the natural-gas pipe welding machine, the pipe clamping structure is structurally arranged, an upper clamping block and a lower clamping block tightly clamp the pipe, waggling can be avoided, welding is stably carried outaccordingly, the welding effect is improved, the service life of the pipe is thus prolonged, and the use hidden danger is reduced.

The invention provides a method for predicting the fatigue life of a steel rail. According to the method, a steel rail testing area is selected, a damage mechanics method is taken as a basis, damage evolution equation parameters of damage mechanics are determined according to an S-N curve of material fatigue, a theoretical life assessment method of damage mechanics is subjected to secondary development on a commercial finite element software platform, a function module for fatigue life assessment of the steel rail is formed, and theoretical assessment of the fatigue life of the steel rail is obtained through calculation by the aid of a finite element model. With the implementation of the method and the system, the fatigue life of the steel rail can be theoretically predicted, higher accuracy is realized, and the purpose of reducing potential safety hazards during use of the steel rail can be achieved.

The invention discloses a welding device with a clamping structure of a connecting head, which comprises a welding device and a structure of a connecting head fixed on the welding device. The structure of the connecting head includes a connecting seat, and a connecting The electric plug-in column is provided with a dovetail-shaped slider in the vertical chute, a locking plate is fixed on the outer wall of the slider, and a locking protrusion is integrally formed on the top of the inner side of the locking plate. A return spring is fixed between the top surface and the top wall of the vertical chute, and an electric plug seat is also provided. There is an electric connection cavity in the electric connection socket, and a circular magnetic ring is arranged in the electric connection cavity. There is a conductive jack in the conductive plate, a magnet ring block is arranged in the electric connection seat, and a post holder is fixed in the center of the magnet ring block. The structure of the present invention is reasonably set up, and it is not easy for the electric head to fall off. At the same time, it is equipped with a magnet ring block and a circular magnetic ring, which can ensure the stability and applicability of the connection between the electric plug post and the conductive jack on the conductive plate. Strong and practical.

The invention belongs to the field of pharmaceutical preparation, and particularly relates to stable fasudil hydrochloride injection and a preparation method thereof. The fasudil hydrochloride injection comprises fasudil hydrochloride, stabilizers, anhydrous citric acid, sodium citrate dihydrate, sodium chloride and water for injection, wherein the stabilizers comprise N-carboxymethyl chitosan and reduced glutathione according to the mass ratio of 1:(0.05-0.35). The preparation method includes the steps: dissolving components in the formula by the water for injection after pyrogen removal; adjusting pH (potential of hydrogen); adding medicinal carbon for stirring adsorption to further remove pyrogen and perform discoloration; performing filtration and decarburization; performing filtration, sterilization, sub-package, potting and sterilization to obtain the fasudil hydrochloride injection. The fasudil hydrochloride injection has fine light stability and simple in formula, insoluble particles are effectively suppressed, the preparation process is easily operated, and industrialization is facilitated.

The invention discloses a contactor driven by capacitive stored energy. The contactor comprises at least one joint contact, a joint electromagnet, an electromagnet drive circuit and an open circuit energy storage capacitor. The open circuit energy storage capacitor is connected to the contactor, so that the contactor can still drive the open circuit electromagnet to enable the joint contacts to reset in an opened state under the condition of no power supply, action is rapid and reliable, using potential safety hazard of the contactor is effectively reduced, and the contactor and the relevant circuits are protected; in addition, through design of a starting button and a break button, the contactor can be switched on and off in an automatic, semi-automatic and manual mode, various flexible control modes are achieved and enriched, and the contactor is safer and more reliable. The contactor can be widely applied to the field of various contactors.