60results about How to "Convenient laying and construction" patented technology

The invention relates to a middle-voltage power transmission fire-resistant cable, which is characterized in that a fire-resistant layer out of a middle-voltage cable core includes an inner fire-resistant inorganic fiber thermal insulating layer, and an outer composite fire-resistant thermal insulating layer, which is a soft thermosetting elastic body in normal use and is a fire-resistant thermalinsulating layer when exposed to fire, wherein the thermosetting elastic body consists of 30-50wt percent silicon-based elastic material, 40-60wt percent inorganic filling material, 5-15wt percent middle- and low-temperature frit, and 4-10wt percent vulcanizing agent and is prepared by mixing, extruding, shaping and vulcanizing. The composite fire-resistant thermal insulating layer is a soft protective material for ensuring the good bending property of the fire-resistant structure under normal condition, can change to tubular fire-resistant thermal insulating structure when exposed to fire orhigh temperature and can not be damaged for a certain time in fire environment so as to effectively prevent the flame or high temperature from damaging the inner insulating layer. When the outer flame temperature is 850DEG C, the surface temperature of the inner insulating layer is less than 180DEG C. The fire-resistant thermal insulating structure can be applied in common cable protection mannerand has very high production efficiency.

The invention relates to a modularization natural air conditioning device by using solar energy to heat air, mainly comprises a heat collector, an inlet part and an outlet part. The heat collector comprises a transparent cover plate on the upper part and a heat absorption component on the lower part. The heat absorption component comprises a plurality of modularization heat absorption units. The heat absorption unit is an integrated forming part comprising a support plate, a heat absorption plate and a bottom plate. The efficacy of the transverse expansion and laying can be reached by locking and locating structures arranged on a plurality of heat absorption plates and the bottom plate.

A withstand voltage testing device for underground cable laying comprises a cable roller used for winding a cable, a roller frame and a swing frame used for preventing uneven winding of the cable. Thecable roller is connected with a winding motor through a speed reducer, and the swing frame is connected with a driving motor through a crank sliding block mechanism. The crank sliding block mechanism is connected with a test ring, the test ring is connected with one test terminal of a pressurization test device, and the other test terminal of the pressurization test device is connected with a wire in the cable; an annular magnet is adsorbed at each of the two ends of the test ring, and iron sand is adsorbed on the annular magnets; and the cable penetrates through the test ring and the innerrings of the annular magnets and is in contact with the iron sand. The device is low in cost, small in occupied area, convenient to test, convenient to lay and construct and high in reliability, and an electric leakage point can be quickly found.

The invention discloses a cable trench cover plate laying device. The cable trench cover plate laying device comprises a movable bottom plate, a laying vehicle, a traction device, a hopper, an overturning support and a propelling device. The hopper is arranged on the upper portion of the movable bottom plate and used for bearing the cable cover plate. In the laying process, the hopper is turned over by 90 degrees, then the cable cover plate on the outermost edge is pushed out and made to fall into the flattening vehicle, and then the cable cover plate is flattened through the flattening vehicle. The laying efficiency is greatly improved, and meanwhile, the labor intensity of workers is greatly reduced.