Method for treating chlorinated polyethylene wastewater

The invention relates to a method for treating chlorinated polyethylene wastewater and belongs to the technical field of ethylene homopolymers or copolymers. The method is characterized by comprising materialized pretreatment, biochemical treatment and sludge treatment; the materialized pretreatment comprises grating, pH regulation, precipitation, micro-electrolysis, sediment neutralisation, compound three-dimensional electrolysis and concrete precipitation; the biochemical treatment comprises hydrolysis acidification and contact oxidation; and the sludge treatment comprises sludge concentration and filtration. Aiming at high COD content of the chlorinated polyethylene wastewater, the treatment method has low cost which is about one half of the prior art.

Concrete slurry containing magnesium and its preparation process and application thereof

Accurate control method for yarn tension

The invention relates to an accurate control method for yarn tension. In the method, a brake is additionally arranged based on an original brake so that the yarn tension is controlled by two brakes, wherein the brake with a relatively large torque provides pre-applied tension for the yarn, and the other brake with a relatively small torque adjusts the variation of tension on yarn according to a control signal of a yarn tension detection control device so that the yarn tension can be stably kept within a relatively small variation range, the yarn breakage phenomenon is prevented during the high-speed operation of a weaving machine, and the stable operation of the weaving machine is guaranteed.

Accurate control method for yarn tension

The invention relates to an accurate control method for yarn tension. In the method, a brake is additionally arranged based on an original brake so that the yarn tension is controlled by two brakes, wherein the brake with a relatively large torque provides pre-applied tension for the yarn, and the other brake with a relatively small torque adjusts the variation of tension on yarn according to a control signal of a yarn tension detection control device so that the yarn tension can be stably kept within a relatively small variation range, the yarn breakage phenomenon is prevented during the high-speed operation of a weaving machine, and the stable operation of the weaving machine is guaranteed.

Segment-based method for detecting and controlling yarn tension of weaving machine on line

The invention relates to a segment-based method for detecting and controlling the yarn tension of a weaving machine on line. A plurality of special point positions on a tension roll are selected as yarn tension detection points. Grooves are processed at the selective positions of the detection points and piezoelectric sensors are arranged in the grooves. The integral tension control of yarns of the weaving machine is realized by measuring the tensions of the special point positions, which are acted on the yarns in the weaving process. The segment-based method can be used for directly detecting the tension of the single yarn. The detected tension has a small base number so as to reduce the measuring range of the sensors and improve the detection accuracy. The yarn breaking phenomenon which is generated when a certain yarn is broken due to excessively large tension is avoided so that the product quality is guaranteed.

Method for controlling yarn tension produced during starting weaving machine

The invention relates to a method for controlling the yarn tension produced during starting a weaving machine, and the method is characterized in that a small torque brake is additionally arranged on the yarn-feed beam of the traditional weaving machine; and when the weaving machine is started, the small torque brake brakes the yarn-feed beam, and a yarn tension detection and control device calculates the required torque of the yarn-feed beam according to a received torque of a take-up beam, and sends control signals to a yarn-feed beam motor and the brake, so that the yarn-feed beam motor and the brake are ensured to operate according to the control signals. By utilizing the method provided by the invention, the follow between the yarn-feed beam motor and a take-up beam motor is realized, and the requirements for larger static torque of yarns are met.

Method for preparing chlorinated polyethylene by aqueous phase suspension method

The invention relates to a method for preparing chlorinated polyethylene by an aqueous phase suspension method and belongs to the technical field of ethylene homopolymers or copolymers. The method comprises chlorination and neutralization and is characterized in that: a chlorination working procedure comprises a three-section type chlorine introduction and reaction step: in the first section: chlorine accounting for 40 percent of the total quantity is introduced at a temperature of between 70 and 110 DEG C; after chlorine conduction is finished, the pressure is less than 0.25 NPa; in the second section: the chlorine accounting for 20 percent of the total quantity is introduced at the temperature of between 110 and 135 DEG C; after the chlorine conduction is finished, the pressure is less than 0.36 NPa; in the third section: the chlorine accounting for 40 percent of the total quantity is introduced at the temperature of between 135 and 142 DEG C; after the chlorine conduction is finished ...