4results about How to "Avoid partial damage" patented technology

The utility model discloses a heating and ventilation pipe assembly structure for heating and ventilation engineering, which comprises assembly sections, and each assembly section comprises a sleeve fixing frame. The fixing frame comprises a connector and a hanging frame, and sleeving parts are arranged on the two sides of the connector; the inner diameter of the sleeve is larger than the outer diameter of a heating and ventilation pipe to be assembled, a plurality of protruding ribs protruding towards the inner side are formed on the inner pipe wall of the sleeve, and the protruding ribs are evenly arranged on the annular face of the inner pipe wall of the sleeve. A heat preservation material layer is further formed on the inner pipe wall of the sleeve to serve as an inner pipe face lining material; the heating and ventilation pipe to be assembled is concentrically assembled in the sleeve, and in the assembling state, the protruding ribs abut against the outer pipe wall of the heating and ventilation pipe to be assembled. A gap is reserved between the surface of the heat preservation material layer and the outer pipe wall of the heating and ventilation pipe to be assembled, and the gap is filled with foaming heat preservation glue. The heating and ventilation pipeline has the advantages of being convenient to install, good in heat preservation effect, high in attractiveness and the like, and solves the problems that a traditional heating and ventilation pipeline is poor in heat preservation performance and unreasonable in installation and fixing mode.

The invention discloses a shield tunnel decompression, drainage and anti-floating comprehensive management system and a construction method thereof. The comprehensive management system is installed during the construction period of the shield tunnel, and comprises a bag-enlarged drainage anchor rod, a drainage pump, a water storage tank and a control system; the bag-enlarged drainage anchor rod can effectively prevent the tunnel from floating up by reducing the pressure through drainage, and can also provide sufficient pull-out resistance through the enlarged bag; by adopting annular steel beams and longitudinal steel beams, the pull-out resistance reaction force provided by the bag-enlarged drainage anchor rod is evenly distributed on the pipe segment in the water storage tank area at the bottom of the shield tunnel, effectively preventing the deformation and dislocation or local damage of the pipe segment caused by uneven stress; the bag-enlarged drainage anchor rod and the water storage tank of the invention work together to reduce the pore water pressure in the soil layer at the bottom of the shield tunnel by drainage to reduce the buoyancy of the shield tunnel, and at the same time increase the water storage capacity in the water storage tank to increase the deadweight of the shield tunnel, so as to comprehensively prevent and control the floating of the shield tunnel.

The utility model belongs to power transmission and transformation equipment field discloses a closing resistor structure for circuit breaker arc extinguishing chamber, including, two symmetrical support seat, insulating stick, its both ends are inserted into two symmetrical support seat respectively, polytetrafluoroethylene inner cover, its sleeve joint is on insulating stick, resistance string, by a plurality of resistance sheet is in series and is arranged along the axial direction of insulating stick and is formed, one end of resistance string is contacted with polytetrafluoroethylene inner cover, and the resistance sheet of both ends end portion of resistance string is connected with support seat respectively. Because the utility model passes through the polytetrafluoroethylene inner cover of installation between insulating stick and resistance string, can alleviate the collision between resistance sheet and insulating stick when vibrating, thereby avoiding the partial breakage of the inner hole edge of resistance sheet due to operation or transportation vibration, thereby improving product performance, ensuring the safe operation of power grid.

The invention discloses a high-precision hollow blowing mold blowing mechanism which comprises a bearing frame, and an air compressor, a PLC (programmable logic controller), a fixing frame and a compressed gas quantitative storage tank are sequentially mounted in the bearing frame. By installing the filtering and purifying cylinder and the like, when the device is used, the air compressor is started, and air in the external environment passes through the filtering and purifying cylinder in advance and then enters the air compressor to be compressed; large-particle impurities in the air can be filtered out through the stainless steel filter screen nozzle in sequence in the filtering and purifying barrel, suspended solids, fibers and the like in the air are adsorbed and filtered out through the activated carbon filtering layer in the filtering and purifying barrel, and therefore it can be guaranteed that compressed air obtained after the air enters the air compressor finally to be treated through the device is high in cleanliness and good in quality; the air compressor can be prevented from being blocked, and compressed gas blown into the hollow blow molding mold is less in impurity and does not pollute a product.