5results about How to "To prevent" patented technology

This utility model relates to the field of electric wire and cable production technology, and in particular to an extrusion coating device for electric wire and cable. This device allows the electric wire and cable to be coated with different materials sequentially during its movement, thereby forming a multi-layer composite structure in a single processing cycle, effectively improving production efficiency and the bonding strength of the coating layers. The extrusion mold is equipped with a thickness control component, including horizontally movable left and right adjustable die lips, which can precisely adjust the size of the discharge hole, ensuring the uniformity and adjustability of the coating thickness to meet the processing needs of electric wire and cable of different specifications. Furthermore, the design of the conical injection channel and stepped transition surface optimizes the flow distribution of the molten material, reducing turbulence and bubble generation, and improving the coating quality. The combined use of the guide sleeve and positioning component accurately guides the electric wire and cable into the extrusion cavity, preventing deviation and ensuring the symmetry and consistency of the coating layers. The overall structure is compact, easy to operate, suitable for continuous production, and has high practicality and economy.

The invention provides a method for rapidly extracting light-color phenolated lignin, and belongs to the field of biomass refining. The method comprises the following steps: uniformly mixing a lignocellulose raw material with a mixed solution of aromatic sulfonic acid and a phenolic compound according to a certain solid-to-liquid ratio, and carrying out ultrasonic treatment at a certain temperature; and after the treatment is completed, carrying out solid-liquid separation, pouring the obtained extracting solution into water to precipitate lignin, and washing and drying to obtain the light-color phenolated lignin. The method disclosed by the invention is simple in process, low in time consumption and high in yield, and the solvent is easy to recycle; the prepared lignin is extremely light in color and high in phenolic hydroxyl group content, retains most of aryl ether bonds, can adjust the content of phenolic hydroxyl groups and methoxyl groups in the lignin to a certain extent, and solves the problems of dark color, few functional groups and low reaction activity of the existing industrial lignin. The method can be used for producing lignin-based functional products without further color reduction and activation treatment.

The invention provides an air conditioner and a control method, the air conditioner comprises an air conditioner body and a fresh air assembly, a heat exchanger is arranged in the air conditioner body, an air outlet of the fresh air assembly communicates with an air channel of the air conditioner body, and gas output by the fresh air assembly flows through the heat exchanger and then is exhausted from the air conditioner body. According to the fresh air ventilator, the technical problem that in the prior art, a fresh air pre-cooling structure is additionally arranged, so that condensate water generated by the fresh air ventilator is recycled, and the cost of the fresh air ventilator is high can be solved.

This utility model discloses a chip testing device, relating to the field of electronic chip testing technology. The chip testing device includes a first pressing mechanism and a second pressing mechanism. The second pressing mechanism includes a cover assembly, a pipe connector disposed on the cover assembly, and multiple first test pieces. The cover assembly is detachably disposed on a base to open or close the slot of the positioning groove. The first test pieces are used for electrical connection with the chip. The cover assembly has a flow cavity, and multiple first test pieces are spaced apart within the flow cavity to form multiple gas supply channels. One end of the pipe connector is used to connect to a nitrogen gas source, and the other end is connected to the multiple gas supply channels. The technical solution provided by this utility model achieves the effect of eliminating electric arc generation through the interaction of nitrogen input and the first test pieces as testing structures, thereby improving the overall safety of the testing device.

The utility model provides a tooth socket and a caries prevention device thereof, which relate to the technical field of tooth sockets, the tooth socket comprises a base material layer, a wrapping layer and a protective layer, the wrapping layer is arranged on the base material layer, and the protective layer is arranged on the wrapping layer. The caries prevention device comprises a fixing block, the fixing block is fixedly installed on the inner wall of the base material layer, a groove is formed in the fixing block, a storage box is installed in the groove, the back of the storage box is communicated with an air bag, and a baffle is installed in the air bag. The protective layer is arranged to protect the wrapping layer, so that the protective layer can prevent the tooth socket from being abraded due to long-term use, and the service life of the tooth socket can be guaranteed; by arranging the storage box, the effect of storing the mouthwash is achieved, and the use convenience of the tooth socket is improved; by arranging the air bag, the effect of discharging the mouthwash in the storage box is achieved, and the effect of preventing decayed teeth of a wearer caused by bacterium breeding is achieved.