259results about How to "Shorten maintenance period" patented technology

The present invention performs suitable fail-safe control while suppressing excessive increase in current for charging a DC power source or in DC link voltage, when a failure has occurred in a rotating electric machine drive unit. This inverter control device selectively performs: active short circuit control (ASC) of either upper stage side active short circuit control which turns on upper stage side switching elements of arms for all plural phases or lower stage side active short circuit control which turns on lower stage side switching elements of the arms for all the plural phases; and shutdown control (SD) which turns off all switching elements. The inverter control device performs the active short circuit control (ASC) or the shutdown control (SD) in accordance with a modulation control system that has been running when a failure has occurred in the rotation speed of a rotating electric machine or in the rotating electric machine drive unit.

The invention discloses a curing agent for sludge solidification and stabilization. The curing agent contains the following ingredients by weight percentage: 20-40% of Portland cement, 10-30% of fly ash, 10-30% of lime, 10-30% of ferrous sulfate and 5-12% of inorganic salt, wherein the inorganic salt is one or a combination of more than two selected from aluminum salt, calcium salt, sodium salt and magnesium salt. The curing agent of the invention can treat raw sludge difficult for preliminary mechanical dewatering, simplify the treatment process and difficulty, shorten the construction period, lower the cost of treatment and realize good treatment effect.

The invention discloses a coke dry quenching slope air course supporting brick overhaul construction process, which comprises the following steps: a) mounting a suspended ceiling supporting device; b) removing part of refractory bricks of a pillar of the slope air course; c) mounting an piece for anchoring the root part of the pillar of the oblique air course; d) providing castable and making castable prefabricated bricks; e) constructing the castable and building the castable prefabricated bricks; and f) removing the ceiling supporting device. The coke dry quenching slope air course supporting brick overhaul construction process has the advantages of prolonging the service life of the supporting part of the slope air course, reducing overhaul construction period, reducing maintenance cost and saving production cost.

The invention provides a method for rut maintaining and paving of a municipal road. The method comprises the following steps: (1) milling an asphalt surface layer; (2) spreading a modified emulsified asphalt bonding layer; (3) paving an emulsified asphalt cold-recycling mixture lower surface layer; (4) paving a high-elasticity rubber asphalt stress absorption layer; and (5) paving a cement-asphalt pouring type composite pavement surface layer. The combined paving layer obtained through the method has an excellent anti-rutting property and can sufficiently utilize a milled waste asphalt mixture; the integral structure has the characteristics of high rutting resistance, skid resistance, abrasion resistance, long life and low carbon.

A state in which a vehicle travels while an internal combustion engine drive torque (Te) is transmitted to a driving wheel wherein, Te and a clutch torque Tc are reduced and an electric motor torque (Tm) is increased based on the fact that a shift up condition has been established (t1). Thereafter, based on the fact that Tc is zero (t2), Tc is maintained at zero, and while maintaining a state in which Tm is transmitted to the driving wheel, a shift up operation is performed (t2 - t3). Then, based on the fact that the shift up operation is complete (t3), Te and Tc are increased and Tm is reduced (T3 - T5). After the shift up condition has been established, during the time until Tc becomes zero, the load torque (Ts) of a generator rotatably driven by the power shaft of the internal combustion engine is generated. In a hybrid vehicle equipped with an AMT, the power consumption accorded to the electric motor drive when shifting up while using the assist for the electric motor torque can be reduced.

The invention relates to a shape memory alloy energy consumption combined column with a resetting function and a mounting method thereof and belongs to the technical field of structural projects. Theshape memory alloy energy consumption combined column comprises a foundation, assembled square steel pipe columns, I-shaped columns, H-shaped steel beams, anti-buckling supports and connecting short beams, T-shaped splicing plates are fixed to the joint area parts of the assembled square steel pipe columns, and grooves are formed in the upper portions and the lower protons of the T-shaped splicingplates correspondingly. The T-shaped splicing plates and the assembled square steel pipe columns are connected by self-locking bolts, the joint area parts of the I-shaped columns are connected by resetting joints, and the middle of each layer of each I-shaped column is connected by three splicing plates through bolts. Shape memory alloy long bolts are arranged between the upper flanges and the lowerflanges of the I-shaped columns, one ends of L-shaped connecting plates are fixedly connected with the connecting short beams, the other ends of the L-shaped connecting plates are fixedly connectedwith the H-shaped steel beams, and ribbed plates are welded to the corresponding positions of the columns. The anti-buckling supports between the assembled square steel pipe columns and the I-shapedcolumns are connected in a combined mode. According to the shape memory alloy energy consumption combined column with the resetting function and the mounting method thereof, the effects that completeassembling is conducted on a construction site, energy dissipating can be achieved in an earthquake, and the after-earthquake restoring capacity is improved are achieved.

Anhydrous press-in slurry used for a blast furnace is used for repairing the blast furnace in the damping down process through pumping and belongs to the field of a refractory material in inorganic nonmetallic materials. The anhydrous press-in slurry consists of the following materials by weight: 40-60% of aggregates, 5-15% of matrixes, 25-40% of a binding agent and 1-5% of additives, wherein the aggregates can be one of high bauxite, silicon carbide and a carbon material or a composite of the high bauxite, the silicon carbide and the carbon material, and the aggregate size is less than 0.5mm; the matrixes can be one of silica micropowder and binding clay or a composite of the silica micropowder and the binding clay generally; the binding agent can be a liquid phenolic resin; and the additives can be a curing agent and the like. The mixed powder and the binding agent are pressed in a damaged part of a lining of a furnace shell by a grouting machine and then are cured to form a solid compact whole body, thereby avoiding the damage of a water press-in material used for the blast furnace to the carbon lining after production, so as to shorten the overall time, improve the efficiency and ensure the long-time and stable operation of the blast furnace.

The invention discloses a tool and method for replacing a shaft bushing at the big end of a connecting rod of a diesel engine of a million-kilowatt-class nuclear power plant. The replacing tool comprises a main connecting rod-side piston positioning and adjusting tool and an auxiliary connecting rod-side piston connecting rod component positioning tool, wherein the auxiliary connecting rod-side piston connecting rod component positioning tool is arranged between the upper surface of a balancing block of a crankshaft of the diesel engine and the lower bottom surface of an auxiliary connecting rod cylinder; and the main connecting rod-side piston positioning and adjusting tool extends into a main connecting rod cylinder, and a jacking part on the main connecting rod-side piston positioning tool is used for jacking up a piston in the main connecting rod cylinder so as to facilitate the separation of a main connecting rod from an auxiliary connecting rod. By adopting the tool and method for replacing the shaft bushing at the big end of the connecting rod of the diesel engine, the disassembly of affiliated pipelines of related cooling water, lubricating oil, fuel oil and other systems, the removal of a cylinder head component of the diesel engine, the integral lifting-out of a piston connecting rod component and other conventional replacement works are not required when the shaft bushing is replaced, and a crankshaft bearing is directly replaced from an observation hole, thereby greatly saving the working time, obviously shortening the maintenance working period on the premise of not reducing the reliability, and lowering the maintenance cost.

Provided is a power conversion device that reduces the power capacity that is required of a power buffer circuit. A converter (3) performs full-wave rectification with respect to a single-phase voltage (Vin) and outputs a rectified voltage (Vrec) between direct current power supply lines (LL, LH). An inverter (5) receives the rectified voltage (Vrec) and supplies three-phase alternating current (Iu, Iv, Iw) to an inductive load (6). A power buffer circuit (4) is connected between the direct current power supply lines (LL, LH). The power buffer circuit (4) comprises a discharge circuit (4a) and a charging circuit (4b). The discharge circuit (4a) comprises a capacitor (C4) and a switch (Sc) connected in series. The charging circuit (4b) is configured, for example, from a step-up chopper and comprises a switch (Sl), a reactor (L4), and a diode (D40). One part of a power pulse that is input into the converter (3) is transferred between the direct current power supply lines (LL, LH) by the power buffer circuit (4).

The packet reception control device includes: a load detection section for detecting a load on a processor and outputting the detection result; and a reception control section for determining whether or not the processor should receive a reception packet based on the detection result output from the load detection section and outputting the determination result. The processor receives the reception packet according to the determination result output from the reception control section.

The invention relates to a short-circuit processing method for a stator iron core of a steam turbine generator. The texture is clearly visible, clean it with a vacuum cleaner while grinding; 3) Repeatedly scrub the polished surfaces with a white cloth dipped in alcohol; 4) Carry out the generator iron loss test to determine whether the quality of the short-circuit iron core is qualified, if so, go to step 6) , otherwise go to step 5); 5) Take out the upper layer bar at the fault point, carry out iron core processing, and return to step 4); 6) Determine whether the area of ​​the stator core welding exceeds the set threshold, if so, Make a fake iron core, insert the fake iron core into the iron core pit and fix it, otherwise fill it with insulating material and shape it. Compared with the prior art, the present invention has the advantages of wide application range, safety and reliability, and high maintenance efficiency.

The invention discloses a stainless steel filter head plate with a novel structure, comprising a stainless steel filter plate and a filter head. The stainless steel filter head plate is characterized in that the stainless steel filter plate is a corrugated plate; the filter head is arranged on a wave crest; two sides of the stainless steel filter plate, which are perpendicular to a corrugated direction, are provided with closing plates, and the other two sides of the same are provided with connecting plates; the closing plates and the connecting plates are all provided with connecting screw holes; and the shape of the cross section of the corrugated plate is a continuous trapezoid preferably. The stainless steel corrugated plate has very high rigidity and can meet the requirement for moving upper and lower loads in a filter pool and balance the tiny difference of air pressure and water pressure during the back wash of the bottom of the filter plate inside the filter pool because back wash air and water which are positioned at the bottom of the filter plate are communicated on wave crest and wave trough positions due to the corrugated structure of a filter plate surface; and in addition, the stainless steel filter head plate also has the advantages of safety, hygiene, long service life, portability, simple structure, convenient installation, simultaneous installation and use, high residual value, and the like.

The invention discloses a CFB boiler inlaid type hood air distributing device and an improving method thereof, and belongs to the technical field of heat-engine plant circulating fluidized bed boiler air distribution plate transformation. The CFB boiler inlaid type hood air distributing device comprises a tube nest, air distribution plate castable and the like. The tube nest is located at the upper portion of an air chamber. Hearth water wall tubes are evenly arranged below the tube nest. The air distribution plate castable is laid on the tube nest with reserved gaps. An air pipe B is inlaid in an air pipe A, penetrates the tube nest and extends into the air chamber. The air pipe A and the air pipe B are fixed through welding points. A strengthening casing pipe is fixed to the intersection position of the air pipe A and the tube nest. Small air holes of the air pipe B are formed in the upper portion, above the air pipe A, of the air pipe B. An I-shaped hood is buckled at the upper portion of the air pipe A, and I-shaped hood air outlet holes are formed in the I-shaped hood. According to the CFB boiler inlaid type hood air distributing device and the improving method thereof, welding and fixing points are broken by dismounting the hood, part of air pipes are cut, new air pipes are inserted, welding and fixing are conducted, and therefore the running resistance of an air distribution plate can be adjusted; and the problems that the air distributing uniformity is poor, temperature distribution is uneven, slag leaks in the air chamber, and the power consumption of a primary draught fan is large are solved.

The invention discloses a method for measuring the radial flow path clearance of a steam turbine through a laser tracking measuring system. The method comprises the steps that S10, the radial relativeposition of a rotor and a steam cylinder in r the cold state of the steam cylinder is measured; S20, the laser tracking measuring system is adopted to measure a shaft seal and rotor hub surfaces corresponding to partition plates in a station transferring mode, and the diameters and rotor vertical arcs of the measured rotor hub surfaces are fitted; S30, the laser tracking measuring system is adopted to measure tooth tip coordinates of all stages of partition plate steam seal blocks and shaft seal steam seal blocks in the cylinder, and shaft seal bores on the outermost side of the steam end andthe exciter end in a station transferring mode, the shaft seal bores on the outermost side of the steam end and the exciter end are fitted, a cylinder body center line is created, and the distances from the tooth tips of all the stages of partition plate steam seal blocks and the shaft seal steam seal blocks to the cylinder body center line are fitted; and S40, the laser tracking measuring systemis adopted to fit the radial clearance of an actual partition plate steam seal and the shaft seal steam seal in the cylinder under the cold state according to the measured relative position of the rotor and the steam cylinder and based on data in the step S20 and the step S30. By applying the method for measuring the radial flow path clearance of the steam turbine through the laser tracking measuring system, the measuring precision is improved.

The invention discloses a spanning type bridge maintenance system which comprises two travelling mechanisms, two maintenance trolley frames and a maintenance platform. The two travelling mechanisms as well as the two maintenance trolley frames are arranged on the two sides of a bridge oppositely. The maintenance trolley frames travel through the travelling mechanisms. The maintenance platform is arranged between the two maintenance trolley frames in a spanning mode. Since pre-buried barrels are arranged in the bridge in advance, support suspension arms can be directly inserted into the pre-buried barrels for paving travelling sleepers when the bridge needs to be maintained, the traveling sleeps are paved on the two sides of the bridge and do not influence passing of pedestrians and vehicles. If bridge piers exist in the maintenance process, an operating platform is made to slide towards one side of a supporting device through linear sliding devices so as to recede for the bridge piers; and after the operating platform spans the bridge piers, the bridge can be maintained as long as the operating platform is made to slide reversely and restored in position, and by adoption of the spanning type bridge maintenance system, the trouble that a maintenance device needs to be dismounted when the bridge piers exist in the maintenance process is avoided.

The invention discloses a rapid repairing process for a water wall of a power station boiler. The process comprises the steps that an infrared imaging method is used to determine a leakage area of thetube panel of the water wall; the operation of the unit is stopped, and the boiler is stopped to release water, so as to lower the water wall temperature to below 100 DEG C; a hole is arranged in theleakage area of the tube panel, and an endoscope is used to precisely position an explosion leak position and a damaged position from the hole; the water wall with the explosion leak position and thedamaged position is cut and opened; if the damaged area is large, the water wall is cut, and then welding, tube replacing and repairing are carried out; one or two tube sections to be replaced are reserved; and the tube section is firstly bent and then welded and replaced, so that the welded joint of the part is located outside the water wall. According to the repairing process provided by the invention, the repairing period is shortened; the failure treatment time of the water wall is reduced; safe, long-term and stable operation of the repaired boiler is ensured; and the economic and social benefits are effectively improved.

The invention relates to the technical field of vanadium-titanium ore metallurgy and discloses a residual iron discharging method for a vanadium-titanium ore smelting furnace. According to the erosion particularities of the bottom and a hearth of a titanium slag blast furnace used for vanadium-titanium magnetic iron ore smelting, it is found that the bottom and the hearth of the titanium slag blast furnace used for vanadium-titanium ore smelting are eroded in a 'circular truncated cone plus pan bottom' shape; and through organization of previous furnace clearing materials and data statistics, by means of a comparative analysis method, the position of a residual iron opening of the blast furnace is marked, the erosion conditions of the bottom and the hearth of the furnace are determined, and the amount of residual iron is calculated. It is proved through practice that by means of the residual iron discharging scheme, the maintenance time limit can be remarkably shortened; labor intensity of furnacemen is remarkably lowered; furthermore, furnace clearing cost is lowered; and the residual iron discharging method is more precise, more efficient, more scientific and more reasonable.

The invention discloses a two-pass continuous drawing method for producing a cold-drawn steel pipe. The method comprises the steps of pretreatment, pickling, phosphating, lubrication, cold drawing of rod with mandrel, drawing, and heat treatment. By changing the interaction of pickling, phosphating and lubrication, the physical and chemical properties of the pierced billet are improved greatly, especially the extension and isotropy are greatly improved greatly. Finally, the time and temperature of the heat treatment are controlled to eliminate internal stress of the product. The above processes as an organic continuous production process are indispensable to ensure parameters of each part and to obtain product with good mechanical properties and certain antirust ability, thereby reducing the pass frequency of cold drawing and reducing production cost.

The invention provides oil-based cleaning agent for petrochemical equipment. The oil-based cleaning agent is prepared from the following raw materials in percentage by mass: 9-12% of an emulsifiable penetrant, 1-2% of a penetrant, 1-2% of a non-ionic surfactant, 1-2% of a complexing agent, 1-1.5% of an antirust agent and the balance of an assistant. The cleaning agent is efficient, free of pollution and simple in operation process, is compatible with existing petrochemical equipment, and the cleaning and operating cost is lower. A system cleaned by the cleaning agent can reach a ferrous sulfide cleaning effect, and ferrous sulfide cleaning does not need to be carried out again. The cleaning agent does not contain a strong oxidant or a heavy metal ion of affecting sump oil recycling. The cleaning process is free of wastewater or a liquid waste and is free of corrosivity to equipment.

The invention relates to an on-load tapping switch hanger, which comprises a hanger top, supporting legs, pulleys, lifting hooks and a wire grip, wherein the hanger top is square, the central positionof the hanger top is provided with the pulleys, the four corners of the hanger top are fixedly connected with the supporting legs respectively, the lower part of each supporting leg is connected witha movable supporting foot which is used for fixedly connecting with the four lifting hooks on the upper part of a top cover of an on-load tapping switch respectively, the upper part of one of the supporting legs is fixedly provided with a pulley and the middle part is fixedly provided with the wire grip, a steel cable is connected with the wire grip through the pulleys on the hanger top and the pulleys on the supporting legs, and the tail end of the steel cable is connected with one lifting hook. The on-load tapping switch hanger can conveniently perform tapping switch examination and repairing on the body of a transformer and is not affected by environmental terrains, has the light weight and simple operation, saves human resources, shortens the time for the examination and repairing, has a simple structure, is portable, flexible and easy to mount quickly, and is applied to suspended cores of on-load tap changers of the main transformers of 220 KV and 110 KV.

The invention discloses an aluminum base gelling and curing agent, which comprises calcium aluminate, sulfur aluminum cement and an early-strengthening coagulant aid, wherein the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5. The invention also discloses a preparation method of the above aluminum base gelling and curing agent. According to the method, the calcium aluminate, the sulfur aluminum cement and the early-strengthening coagulant aid, in the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5, are ground, sieved, mixed and stacked up in a cone shape. After that, samples are pressed flat, and peripheral samples are stacked up centrad again in a cone shape and then pressed flat. So repeatedly for several times, and then the aluminum base gelling and curing agent can be obtained. The invention also discloses a method for treating the dredged sediment by means of the above aluminum base gelling and curing agent. Waste and gravels in the mud of the dredged sediment are separated, and then the cationic-type polyacrylamide is added to thicken and dehydrate the dredged sewage. After that, the aluminum base gelling and curing agent is added and mixed with the dredged sewage, and the mixture is stirred. Meanwhile, a water reducer is added and mixed uniformly with the above mixture. After the dehydration and solidification process, the obtained product is subjected to stabilization maintenance. The aluminum base gelling and curing agent is higher in economic, social and environmental benefits.

A motor driving method is provided. A rotor position is determined based on whether or not a neutral point voltage difference, or a voltage difference between neutral point voltage and pseudo neutral point voltage exceeds a predetermined threshold when an energization phase is sequentially selected and energized. The energization phase for starting a motor is determined based on the result of this determination, and the motor is energized and started according to the determined energization phase. The operation mode is not changed directly from a step for searching the initial position of the rotor to a counter electromotive voltage mode. Instead, a search start mode for supplying appropriate rotational speed to the initial startup of the motor is once established, and then the mode is changed to the counter electromotive voltage mode. Following problems are solved: a problem of the correctness of a peak value of a position detection signal taken in; a problem of proneness to be influenced by a variation in motor characteristics caused by the slightness of differences in detection currents between phases; and a problem that methods of comparing voltage differences determined with respect to each group of measured voltages that occurs at a neutral point of motor windings each time a detection signal is applied to determine a large voltage difference require a reference table and high computing power.

The invention discloses an examine and repair method for blast furnace. Wherein, first, determining the material surface height; when the furnace is flameout and delay, sealing all its tuyeres and tapholes with flame-proof mud; arranging access path on furnace wall; building sealed work platform on furnace to arrange inlet and outlet steel pipes; finally, examining and repairing the damaged position. This method cuts half the project time nearly, quickens the reproduction period to eight hours, and decreases total cost greatly.

The invention discloses a span-type steel structure platform for a bridge overhaul system, comprising a supporting device and an operating platform, wherein a linear sliding device is arranged on the operating platform, the operating platform slides on the supporting device through the linear sliding device, an overhaul trolley is arranged on the operating platform, and the operating platform is connected with a sliding driving device. According to the invention, by arranging the operating platform on the supporting device, the operating platform can be driven by moving the supporting device so as to realize segmented overhaul of a bridge; when the operating platform encounters a bridge pier, the operating platform slides to one side of the supporting device through the linear sliding device so as to avoid the bridge pier; and after the operating platform crosses the bridge pier, the operating platform slides to the reverse direction to reset so as to overhaul the bridge continuously. The device avoids the trouble of dismounting the overhaul device in the overhaul process when encountering the bridge pier, so that the overhaul period is greatly saved.

The invention discloses an aging rating method for 15Cr1Mo1V steel for a steam pipeline of a thermal power unit based on field detection for a hardness and a metallographic structure. The method detects the hardness and the metallographic structure of a material, and evaluates an aging level of the material correspondingly according to a detection result for the hardness and the metallographic structure. The method is simple, accurate and effective, a state of the material can be evaluated without damaging cut or sampling, and a metal inspector can be guided to accurately judge an aging degreeof 15Cr1Mo1V steel after high temperature service, thereby assisting a power plant to evaluate the service reliability of the material, and avoiding heavy accidents such as steam pipeline cracking due to severe aging of the material during operation of the power plant. The equipment of the power plant and the personal safety are effectively guaranteed, the maintenance period of the power plant isshortened, and the cost is saved.