57results about How to "Meet life requirements" patented technology

The invention relates to a preparation method of a modified polymer insulator material. The preparation method of the modified polymer insulator material comprises the following steps of: pre-heating an internal mixer to 150 DEG C to 160 DEG C; dropping an upper top bolt after adding polypropylene, banburying for 115 seconds to 125 seconds under the pressure of 0.5MPa-0.6MPa and temperature of 150 DEG C to 170 DEG C; then adding polythene and banburying for 115 seconds to 125 seconds under the pressure of 0.5MPa-0.6MPa and temperature of 150 DEG C to 170 DEG C; raising the upper top bolt, banburying for 115 seconds to 125 seconds under the temperature of 150 DEG C to 170 DEG C; and finally discharging, cooling and pelletizing, wherein the molecular weight of each of polypropylene and polyethylene is 10 thousand to 20 thousand. The modified polymer insulator material prepared by the preparation method not only can satisfy the electrical characteristics and mechanical performance requirements of the insulator, but also can satisfy the service life requirement. Besides, the preparation method has an antifouling self-cleaning function and has the advantages of high cost performance, energy conservation and environment protection and no pollution, so that the product can be recycled after reaching the service life.

The present invention is a method for evaluating the life of electrolytic capacitors on the busbars of motor drivers. The heat-sensitive technology is used to test the core temperature and the working environment temperature of each busbar electrolytic capacitor of the driver, and the highest core temperature rise ΔT among all the electrolytic capacitors is selected to calculate the driver. When working under the condition of the upper limit temperature of the environment, the temperature of the core of the electrolytic capacitor is T2. According to the difference between the maximum allowable core temperature and T2, and the correction factor of the bus voltage, calculate the life of the electrolytic capacitor of the bus to achieve the purpose of evaluating the life of the driver. The method of the present invention considers the influence brought by the actual upper limit of the operating temperature of the driver and the temperature difference of the test environment, the influence brought by the bus voltage level during actual use, and the influence brought by the uneven temperature rise between the electrolytic capacitors of the bus. Considering comprehensively, The evaluation results are reliable.

The invention relates to the technical field of expressway construction works, in particular to a pile filling technology of large-diameter bagged concrete in a corrosive environment. The invention aims to solve the problems that a concrete construction with a large-size structure has poor corrosion preventing effect and small bearing force in a salinized soil environment by the prior art. The pile filling technology of the large-diameter bagged concrete comprises the following steps of: forming a hole by using a conventional dilling technology; using a steel tube as a slurry discharge pipe in advance after cleaning the hole; counterweighing and then sinking a corrosion preventing bag into brine slurry; injecting fresh water slurry or fresh water after determining the same depth of the corrosion preventing bag and the drilling hole; discharging the brine slurry in the drilling hole through the slurry discharge pipe by using a water-discharge and slurry-injecting method; and casting underwater concrete of a foundation pile until forming the pile by adopting a conventional drilling and pile filling process. The invention has the advantages of favorable adaptability, easy popularization and lower cost; the water-discharge and slurry-injecting method has strong operability; and the predictability of the service life of concrete foundation pile can be defined.

The invention discloses a multi-layer composite solar cell backplane film. The backplane film comprises an intermediate PET base film and a first coating layer and a second coating layer respectively arranged on the upper surface and the lower surface of the PET base film. The second coating is composed of the following raw materials in parts by weight: 40-80 parts of polytetrafluoroethylene resin, 25-45 parts of modified epoxy resin, 5-15 parts of fluorosilicon modified acrylic resin, 1-5 parts of Nano-titanium dioxide and 3 to 8 parts of polyethylene glycol. The multi-layer composite solar cell back sheet film of the present invention not only has excellent properties of weather resistance, aging resistance and damp heat resistance, but also has excellent antibacterial and flame retardant properties, and can meet the long-term service life requirements in harsh environments.

The invention discloses an electric steering engine capable of resisting large bending torque. The electric steering engine capable of resisting the large bending torque comprises a harmonic speed reducer, an output shaft and a connection assembly, wherein the output shaft is fixedly connected with an output steel wheel of the harmonic speed reducer, and the connection assembly is arranged between the output shaft and a load, used for transmitting torque and fixedly connected onto an elastic body. According to the electric steering engine, the connection assembly additionally arranged between the output shaft and the load is used for transmitting the torque and fixedly connected onto the elastic body, so that the connection assembly bears the bending torque from the output shaft. By utilizing the elastic body to unload the bending torque, separation of a carrying object of the bending torque of the electric steering engine is achieved, and the output shaft is only responsible for transmitting the torque. Therefore, the electric steering engine has the advantages of being resistant to the large bending torque, high in reliability and strong in bearing capability, avoids radial displacement of the output shaft under the effect of the being torque, and meets the requirement for long service life of middle-long distance high-altitude air vehicles. The invention further discloses an air vehicle applying the electric steering engine capable of resisting the large bending torque. The air vehicle is high in reliability, long in service life and especially suitable for middle-long distance flight.

The invention discloses a paraffin removal shuttle and belongs to the field of auxiliary equipment for producing wells. The paraffin removal shuttle comprises a tubular shuttle body, three pairs of symmetrical wrap springs are arranged inside the tubular shuttle body, thrust teeth are arranged in tube wall slots of the tubular shuttle body, each thrust tooth is of a pawl-type structure, the bottom of each thrust tooth is in pin joint with the tubular shuttle body, an elbow of an L-shaped structure is arranged at the tail of each wrap spring, an L-shaped short edge of each elbow points to the inside of the tubular shuttle body, L-shaped portions between every pair of wrap springs are clamped through an overlapped slot plate, the tubular shuttle body is composed of two symmetrical sections, the two sections of the tubular shuttle body are fixedly connected through an annular fixing plate by the aid of screws, and the fixing plate and the tail of each wrap spring are fixedly connected in a pressing and embedding manner. By improvement on the wrap spring fixing mode, the problem of stress concentration at wrap spring fixing positions can be solved, service life of a product is prolonged, and the requirement on service life of paraffin removal equipment in a pumping well can be met.

The invention relates to a low-cost hydraulic pump material and a preparation process thereof. The hydraulic pump material is prepared from, by weigh percent, 0.37% to 0.44% of C, 1.2% to 1.6% of Si, 0.70% to 1.00% of Mn, 0.6% to 1.1% of Cr, not larger than 0.020% of S, not larger than 0.020% of P, 0.0005% to 0.003% of B and the balance Fe. The preparation process of the low-cost hydraulic pump material comprises the steps that the raw materials are formed according to the chemical component proportion and smelted through an electric-arc furnace, and continuous casting or mold casting is carried out to form an ingot blank through LF furnace refining and vacuum degassing (VD); and a bar needed for a hydraulic pump is formed through rolling or forging, the bar is machined into a pump blank, and a pump body is formed through a copper coating process at the temperature of 1,050+ / -50 DEG C. According to the low-cost hydraulic pump material and the preparation process thereof, separated-out proeutectoid ferrite can be avoided or reduced, the strength of the pump can be improved, loosening and extracting of an extruding assembly copper sleeve can be avoided, and the requirement of the hydraulic pump for the mechanical property, nitration layer depth and hardenability of the materials can be met.