51results about How to "Reduce hard friction" patented technology

The invention belongs to the field of lubricants, and in particular relates to a gear oil additive, a gear lubricating oil and a preparation method and application thereof. The gear oil additive includes the following components in parts by mass: 1-3 parts of nano-scale copper powder, 2-5 parts of nano-scale silicon dioxide, 3-6 parts of nano-scale alumina, 2-3 parts of nano-scale graphite 5 parts, 1 to 4 parts of micron lead oxide and 3 to 6 parts of micron molybdenum disulfide. The present invention also provides a gear lubricating oil containing the above-mentioned gear oil additive. The gear lubricating oil can not only reduce the starting wear of the friction pair and the hard friction under the boundary lubrication state, but also reduce the pits or protrusions on the gear meshing surface. Mechanical micro-repair and polishing can increase the hardness of the gear tooth surface by about 15%, reduce the roughness Ra of the meshing surface by 5-10%, and reduce the vibration noise by 6-11%.

The invention relates to a semi-sealed device of a four-ram blowout preventer of a coiled tubing and a method. According to the technical scheme, an expandable semi-sealed rubber cylinder is installedat the center of a blowout preventer body, the self-locking end of the tail portion is fixed to the blowout preventer body through a rubber opening pressing ring, and a circular annular cavity is formed; and a semi-sealed expansion control block is fixed to the outer side of the blowout preventer body, an oil inlet buffer groove and an oil outlet buffer groove are formed in the inner side of theblowout preventer body, and the oil inlet buffer groove corresponds to the expandable semi-sealed rubber cylinder of the blowout preventer body. The semi-sealed device of the four-ram blowout preventer of the coiled tubing and the method have the beneficial effects that the expandable semi-sealed rubber cylinder is of an integral structure, the expandable semi-sealed rubber cylinder is fixed in aspecial-shaped cavity of the blowout preventer body through the rubber opening pressing ring, during use, the expandable semi-sealed rubber cylinder can be self-locked on the blowout preventer body bypressing, the other side expands to seal the outer wall of the coiled tubing in a contacted mode, mutual balance of the pressure of internal and external of gas or liquid is achieved, leakage is notprone to occurring, using is more reliable, and the service life of the expandable semi-sealed rubber cylinder is prolonged.

The invention discloses a quick cleaning device for a nozzle of a 3D printer, which includes a chassis. The top of the chassis is vertically fixedly connected with a threaded connection ring, the center of the top of the chassis is provided with a circular card slot downward, and one side of the chassis is vertically provided with a water inlet, and the bottom of the water inlet is connected through a connecting pipe. It communicates with the interior of the circular card slot, the top of the chassis is provided with a fixed cylinder, and the top of the fixed cylinder is symmetrically provided with two clamping devices, and the top of the circular card slot is vertically provided with a vertical A straight rod, the center of the vertical rod is vertically provided with a water outlet pipe, and the side wall of the end of the vertical rod far away from the circular slot is surrounded by a brush. The invention has the advantages of convenient operation and use, can quickly clean up impurities on the inner wall, and will not scratch the inner wall of the nozzle.

The present invention provides a load hanging device for mechanical lifting hanging tower, which involves the field of load patching technology, including: hook body, cardboard, protective cover, balance cover and traction parts;There are two sets of relative side supports at the end, one end of the pull rope is connected to the bottom bottom of the tongue, and the other end is connected to the bottom of the side of the side support.There are top links, the top rod is interspersed in the middle of the protective cover, and through the two sets of cardboard cards, the balance sheet is packed at the middle of the top link through the key axis holes.There is a penetration cavity, and the top link is penetrated into the plug -in cavity through the inner jack.It can eliminate the rotation power when the heavy object is lifted. When the heavy object is landing, the tongue block is automatically separated from the opening end of the hook body, which solves the hard friction of the bottom end of the sling and the hook body when the heavy object is lifted, and the bottom end of the hook body.The hook body sometimes rotates with the heavy objects, which affects the safety of hanging safety.