36results about How to "Delayed cracking time" patented technology

The invention discloses a circulating fan impeller online welding method, and belongs to the field of equipment overhauling. The circulating fan impeller online welding method aims at improving the impeller crack treatment quality and comprises the sequentially-executed steps that a, cracks are removed, wherein U-shaped groove beveled edges are formed, and the cracks are removed; b, welding is carried out, wherein at least two layers of welding beads are adopted for welding, the overlapping pressure face between two adjacent layers of welding beads is not smaller than 1 / 3 of the width of an outer layer welding bead, each layer of welding bead is divided into three segments or two segments to be subject to backward welding, and a joint between two adjacent segments in each layer of welding bead should be staggered by at least 30 mm. According to the circulating fan impeller online welding method, through increasing of the welding throat depth, permeation is more sufficient, capacity of a welding line for bearing stress is improved, time of crack appearing in the welding line can be prolonged, and therefore the use time of an impeller after crack repairing is prolonged, the service life of the impeller is effectively prolonged, the welding line repairing frequency after impeller crack treatment is reduced, and the maintaining cost is saved.

The invention discloses a long-service-life, safe and reliable forging cast iron die for a pig casting machine and a manufacturing method of the long-service-life, safe and reliable forging cast iron die. The forging cast iron die is integrally formed based on a forging technology, at least two separating ribs lower than a high-temperature molten iron liquid face are arranged in the forging cast iron die, an inner die cavity of the forging cast iron die is divided into at least three forming die cavities by the separating ribs, a lap joint mouth Q used for being in lap joint with an adjacent forging cast iron die is arranged at the lower end of the forging cast iron die, a cast iron die tail P corresponding to the lap joint mouth at the lower end of the adjacent forging cast iron die is arranged a the upper end of the forging cast iron die, at least two overflow openings are formed in the lap joint mouth Q, and molten iron protection edges M1 and M2 and lug portions T1 and T2 connected with a chain plate are arranged on the two sides of the forging cast iron die. The poor cast condition metallographic structure and various forging defects of a forging forming cast iron die are avoided and overcome through the forging cast iron die, the thermal fatigue resisting strength of the cast iron die is effectively improved, the safe reliability of the cast iron die is improved, and the service life of the cast iron die is prolonged.

The invention provides a preparing method for polycarboxylate water reducing agent. The polycarboxylate water reducing agent composed of, by weight, 30%-55% of deionized water, 35%-50% of polyoxyethylene ether, 5%-10% of carboxylic acid derivatives monomer, 0.0005%-0.002% of catalyst, 1.5%-4.5% of initiator, 0.2%-0.8% of chain transfer agent, 1.0%-2.5% of structure modifying agent and 4.5%-8.5% of alkali liquor. Under the temperature of 20-35 DEG C, the deionized water and the polyoxyethylene ether are enabled to be put in a reaction still to be dissolved, after the deionized water and the polyoxyethylene ether are fully dissolved, the carboxylic acid derivatives monomer, the catalyst, the initiator, the chain transfer agent and the structure modifying agent are enabled to be added in sequence, after stirring for 28-32 minutes, the mixed liquor still standings for 4-6 hours under room temperature, the alkali liquor is added in under a state of stirring, a potential of hydrogen (PH) value is adjusted to be 6.0-7.5, and then products are achieved.

The invention relates to a method for disintegrating excess sludge through combination of ultrasonic waves and modified eggshells. The method comprises steps as follows: firstly, in terms of 0.05-0.4 g of modified eggshells added to the excess sludge per ml, the modified eggshells are added to the excess sludge, the modified eggshells and the excess sludge are mixed uniformly, and sludge slurry is prepared; the sludge slurry is subjected to ultrasonic treatment through the ultrasonic waves, and the excess sludge is disintegrated. With the adoption of the modified eggshells, the waste eggshells are changed to be wealthy, the environmental pollution is reduced, the problem about disposal and treatment of the eggshells is solved effectively, further, an effective chemical for disintegrating the excess sludge is obtained, the chemical cost for sludge treatment is saved, and the treatment cost of the excess sludge is reduced; with the introduction of the ultrasonic waves in a disintegrating experiment, the sludge cell disintegrating speed is increased greatly, the disintegrating time of the excess sludge is shortened effectively, the treatment efficiency is improved, besides, the disintegrating effect of the excess sludge is remarkable, the settling property is improved perfectly, and the disintegrated sludge is free of foul smell.

The invention discloses a device and a method for directional fracture of rocks. The fracture device consists of a pressure transfer body, a plurality of shape memory alloy bodies and a spacing body. The inner side of the pressure transfer body is provided with symmetrical grooves, and the outer side of the pressure transfer body is arc-shaped; and the cross sections of the shape memory alloy bodies are cross, the left and right ends of the shape memory alloy bodies are embedded in the grooves of the pressure transfer body, and the front and rear ends of the shape memory alloy bodies are embedded with hard straight blades. The method comprises the following steps: putting the directional fracture device into a borehole, adjusting the straight blades towards the predetermined fracture direction, then heating the shape memory alloy bodies to be stretched along the cross direction, forming primary shear fracture on the hole wall firstly through the driven straight blades, and then expanding the cracks through the combined action of extrusion forces of the straight blades and the pressure transfer body so as to cause rock fracture. The rock fracture surface is regular, the fracture efficiency is high, the reuse rate is high, the cost is low, and the method and the device are suitable for stone exploitation, blasting operations of tunnels, side slopes and the like and other pre-splitting blasting and demolition blasting.

The method of cracking the Wired Equivalent Privacy Class Cipher involves cracking a cryptographic protocol such as WEP based on the RC4 algorithm. This method uses the second output byte of PRGA to crack, that is, in the running process of RC4, the arrangement generated when KSA step A+3 is set as S A+3 , and let S A+3 The arrangement obtained directly after the first cycle of PRGA is S′ A+3 , at this time the second output byte of PRGA is S′ A+3 [S' A+3 [2]+S' A+3 [S A+3 [1]+S' A+3 [2]]]; in S' A+3 [2]+S' A+3 [S A+3 [1]+S' A+3 [2]]=A+3 is established, and considering the influence of all Swaps on S after the step A+3 of KSA, the second output byte will be S' with a certain probability A+3 [A+3], when S again A+3 [A+3] did not participate in the exchange in the first cycle of the above PRGA with S' A+3 [A+3]=S A+3 [A+3], so at this time S' A+3 [A+3]=S A+3 [A+3]=S A+2 [j A+3 ], search S A+2 The median is S' A+3 The unit of [A+3] can get j A+3 , and get an estimate of the key K[A+3]=j A+3 -j A+2 -S A+2 [i A+3 ].

The invention discloses a method for processing strobili of pinus massoniana. The method comprises the following steps: (1) fixation: spreading fresh strobili of pinus massoniana and sunning for 3-5 days; (2) degreasing: gathering and piling up the strobili fixed in the step (1), thoroughly watering the strobili, sealing the strobili with a film and bubbling for 3-5 days; and (3) airing: spreading and tedding the strobili bubbled in the step (2), wherein the strobili are turned 1-3 times every day and crack 5-7 days later; and collecting the seeds in time. According to the invention, through the preprocessing steps such as fixation, degreasing and the like for the strobili, the cracking time of the strobili of pinus massoniana is shortened, the opening is neat, and the seed yield is high.In the same conditions, the seed production time is shortened by 20-25 days, the method can be used for effectively responding to adverse weather such as low temperature, overcast and rainy days and the like in southern winter, and improving the strobili processing efficiency; and moreover, the operation is simple and convenient, the method is economical and practical, and the method is suitable for popularization and application in various scientific research and production institutions.