4results about How to "Does not affect product quality" patented technology

The application discloses a preparation method of butyl acrylate. The butyl acrylate is prepared through esterification reaction of raw materials of acrylic acid and n-butanol. The acrylic acid includes acryloyloxypropionic acid, maleic acid and crotonic acid. The mass ratio of the acryloyloxypropionic acid to the maleic acid is 1:0.01-1, and the mass ratio of the crotonic acid to the acryloyloxypropionic acid is 1:5-500. The content of key impurities in the acrylic acid is ensured to be in a specific ratio, and the crude acrylic acid is directly used as a raw material for butyl acrylate production after removal of light components, so that the production cost of the butyl acrylate is greatly reduced, and raw material consumption and energy consumption are reduced. The application is a green and efficient production process.

The invention belongs to the technical field of textile machinery, and particularly relates to a method for adjusting the end retention rate of a ring spinning frame in a variable-count and variable-twist mode. According to the method, through a closed-loop framework formed by a PLC, a human-computer interface and a servo control system, the speeds of front and rear roller threads are dynamically adjusted in a specific window in the doffing stage, the count and twist of the initial section of the covering yarn are temporarily changed, and the head leaving rate is increased while the structural stability is improved; meanwhile, the adjusting section is recognized and completely removed by the electronic yarn clearer in the subsequent spooling process, and it is effectively ensured that the quality of finished products is not affected. According to the method, the temporary count and the twist meeting the head reserving requirement are dynamically introduced in the initial stage of the body covering yarn, it is ensured that the adjusting section is completely removed in the subsequent spooling procedure, and the quality of the body yarn is not affected, the inherent limitation of the prior art is broken through, and the requirements for functionality and quality are effectively met.

This utility model relates to the field of knives, specifically a kitchen knife, comprising a blade, a cutting edge, a handle, and welded end faces. The blade is welded to the bottom of the blade, and welded end faces are provided at the interface between the blade and the cutting edge. The handle is connected to the side of the blade by screws. Two different materials are joined together by welding; this method saves costs, allowing the upper part to use ordinary materials while the lower part can use high-quality materials, controlling costs and improving product quality without compromising quality. The two materials can be heat-treated separately to ensure optimal performance for both.

The utility model discloses a point type contact modularized missile and rocket hoisting structure which comprises a hoisting seat fixed at a hoisting point of a shell of a missile and rocket product and a plug used for packaging the hoisting seat, the connecting cylinder at the upper end of the hoisting seat is inserted from the lower end of the connecting unthreaded hole at the hoisting point of the shell of the projectile product, the connecting plate at the bottom of the hoisting seat is fixed on the inner wall of the shell of the projectile product through a screw, and the plug is fixed in an inner cavity of the connecting cylinder of the hoisting seat. During hoisting operation, the plug is detached from the connecting cylinder at the upper end of the hoisting seat, the lower end of each sling is connected with a threaded connecting column, and each sling is in threaded connection with the connecting cylinder at the upper end of the hoisting seat through the threaded connecting column, so that point type contact projectile hoisting can be realized. According to the modularized projectile hoisting structure, reliable hoisting of projectiles is achieved, and safety and product quality can be improved. After hoisting is finished, a plug is screwed into a threaded hole of a connecting cylinder at the upper end of the hoisting seat, and the pneumatic requirement and the heat insulation requirement of the projectile are met.