45results about How to "Meet the needs of the working environment" patented technology

The invention discloses an excavator bucket tooth and a preparation method thereof, and solves the problems that conventional bucket teeth are general in wear resistance, impact performance and the like, short in service life and high in production cost. The excavator bucket tooth comprises the components in percents by mass: 0.25-0.29% of C, 1.10-1.40% of Mn, 1.50-1.90% of Si, 1.40-1.70% of Cr, 0.02-0.06% of Al, 0.10-0.15% of Mo, and the balance Fe and unavoidable impurities. The invention also provides the preparation method of the excavator bucket tooth, and the preparation method comprises operations of casting and heat treatment. The excavator bucket tooth is substantially improved in mechanical properties, and especially obviously improved in toughness, hardness, tensile strength, wear resistance and the like, and low in material cost.

The present invention relates to an earthquake-proof grooveless coupling for enabling pipes to be connected only by pushing a grooveless pipe into both sides thereof in a state in which upper and lower coupling segments are assembled and fastening a bolt and a nut. The earthquake-proof grooveless coupling (1000) of the present invention comprises: a packing (1100) made from an elastic material andinto which pipes (1, 2) for transferring fluid are fitted from the left and right sides thereof; the upper and lower coupling segments (1200, 1300) for encompassing the packing at the upper and lowerparts thereof so as to accommodate the same, and restricting the axial movements of the pipes (1, 2) at both end portions thereof as the segments become closer to each other; and a fastening means (1400) comprising the bolt (1410) and the nut (1420) for fastening the upper and lower coupling segments to each other, wherein the upper and lower coupling segments have holding parts (1220, 1320) formed in a saw-toothed shape and respectively provided at both end portions (1210, 1310) in the direction of the central axis of the inner peripheral surface thereof, the holding parts are formed to be smaller than the radii of the pipes (1, 2) and formed to have greater hardness than the pipes (1, 2), and the upper and lower coupling segments have cut grooves (1230, 1330) formed to have a predetermined width in the axial direction at equal angles in the radial direction of both end portions (1210, 1310) in the direction of the central axis of the inner peripheral surface thereof, and formed in aslot shape so as to be positioned between the outer diameter of the holding part and the inner diameter of a packing accommodating groove.