122results about How to "Extended service period" patented technology

An inline degassing apparatus for removing solid solution gases as well as nonmetallic inclusions from molten metal in a degassing container, to which the molten metal is continuously introduced for degassing operation and from which the degassed molten metal is continuously removed. A rotary diffusing device is arranged in the degassing container for generating bubbles of inert gas diffused into the molten metal, thereby entrapping solid solution gases as well as nonmetallic inclusions into the bubbles, which are then floated and separated. Heaters are provided, which extend, in a cantilever fashion, from a side wall of container at a position adjacent the bottom wall of the container substantially parallel to the bottom wall.

The invention relates to a non-linear compensating controller in essence of a servo system, belonging to the field of industrial control. The compensating controller of the invention comprises a variable structure neural network feedback compensation part, forward adaptive compensation part and a robust compensation part; therefore, the controller can simultaneously compensate friction non-linearity and driver dead area non-linearity existing in the compensating system. The variable structure neural network compensates for the friction non-linearity in the system while the adaptive robust control carries out compensation control on the dead area non-linearity and external perturbation in a system driver; the variable structure neural network technology reduces network size and calculation amount and strengthens practicality of the controller; the adaptive robust control ensures static precision, transient performance and robustness of the system; applied to location tracking control of the electric motor, as indicated by actual operation results, the compensating controller of the invention can endow the system with excellent static tracking precision and robustness.

The present invention provides an energy management method of a multi-type battery energy storage power station considering charge and discharge rates, that includes: reading related data of the battery energy storage power station; calculating charge or discharge rate characteristic values of battery energy storage machine sets; calculating initial power command values of the battery energy storage machine sets; judging whether the initial power command values of the battery energy storage machine sets exceed the maximum allowable charge or discharge power of the machine sets in real time, if more than, online correcting and re-calculating the initial power command values of the battery energy storage machine sets; otherwise, setting the initial power command values of the energy storage machine sets as the power command values thereof; and summarizing the power command values of the battery energy storage machine sets, and outputting the same. With the reasonable control of the charge and discharge rates of the energy storage machines sets as target, the energy management method of the present invention is used for carrying out power coordinated control and energy management in the energy storage power station, and considering the service lives of energy storage batteries in the control strategy to achieve the functions of avoiding abuse of the energy storage batteries as much as possible, delaying battery aging and the like.

The invention provides a continuously variable crown mill support roll to be matched with a roll curve of a continuously variable crown work roll. The roll shape is skew asymmetrical curve which essentially consists of a roll gap whole line contact curve section in the range of the strip width at the middle of the roll body and a contact line variable curve section at two ends of the roll; and the roll shape curves of an upper support roll and a lower support roll are the same but are arranged reversedly in an angle of 180 degrees The continuously variable crown mill support roll with the roll shape curve and the mill roll system with the continuously variable crown work roll can not only reduce uneven distribution and peak of the contact pressure between the roll, reduce or eliminate side spalling of the continuously variable crown mill support roll with normal crown, improve service cycle and service life of the support roll and reduce roll consumption of the support roll, but also overcomes harmful contact zone outside the rolled strip width and improves roll gap lateral rigidity of the mill and plate shape control efficiency of bending force, thereby improving plate shape quality of the rolling strip.

The invention discloses an iron-based non-crystalline composite coating for protecting heat exchange pipes in the flue gas waste heat recovery system of a power station boiler, and a laser re-melting and moulding technology thereof. The iron-based non-crystalline composite coating is composed of the following elements in percentage by weight: 55.1 to 66.2 wt% of Fe, 24.4 to 34.3 wt% of Cr, 2.4 to 3.4 wt% of B, 1.5 to 2.9 wt% of Si, 1.7 to 3.9 wt% of Mo, and 1.6 to 3.8 wt% of Nb. The moulding technology comprises the following steps: preparing iron-based non-crystalline cored wires, adopting an ultrasonic electric arc spraying method to prepare an iron-based thermally-sprayed alloy coating on the surface of a heat exchange pipe; and then adopting neodymium-doped yttrium aluminium garnet (YAG) laser as the heat source to carry out laser re-melting and moulding on the positions, which are prone to low-temperature acid dew point corrosion, on the thermally-sprayed coating so as to form compact iron-based non-crystalline composite coating; wherein the coating and the substrate are combine through metallurgy, and no crack and gap exists between the substrate and the coating. The provided coating prevents the transfer of the low-temperature acid dew point corrosion, thus prominently improves the service life of the flue gas waste heat recovery system, relieves the symptom of low-temperature acid dew point corrosion, and has a great application potential.

The invention belongs to the technical field of hot rolling, and discloses a method for controlling orange peel reticulate pattern defects on the surface of strip steel. The method is characterized by comprising the following steps: adopting an SGB roll profile curve on a supporting roller of a hot rolling temper mill; adopting an SGW roll profile curve on a working roller. The process parameters of the temper mill are set as the rolling force of 200-250 tons, the unwinding tension of 9-12 tons, and the winding tension of 20-23 tons, the rolling reduction of straightening rollers is used in a straightening machine group, and a roller shifting strategy with constant frequency, variable step sizes and variable stroke is adopted. According to the method, through the application of the SGB and SGW roll profile curves, a specific smoothing process and the roller shifting strategy, local wear of working rollers is greatly reduced, and orange peel reticulate pattern defects on the surface of the strip steel are effectively overcome.

The invention relates to an intermediate roller contour, in particular to an intermediate roller contour of an intermediate roller movable type convexity high-accuracy control temper mill. The intermediate roller contour of the intermediate roller movable type convexity high-accuracy control temper mill consists of three continuous line segments, wherein a polynomial curve equation of a head roller contour is y=A2x<2>+A4x<4>+A6x<6>+A8x<8> by taking a crossing point of a head part and an intermediate segment as an origin of coordinates, axial direction of the intermediate roller as an X axis and radial direction of the intermediate roller as a Y axis; and in the equation, the origin of coordinates is the crossing point of the head roller contour and the intermediate segment, the axial direction of the intermediate roller is the X axis, the radial direction of the intermediate roller is the Y axis, R' is radius difference between roller bodies of two roller-shaped ends of the head, and L1 is more than 0 and less than or equal to L/3 and the R' is more than 0 and less than R. Through the roller contour, a forced-contact condition is greatly relieved, contact pressure between rollers is uniformly distributed, a peak value of the contact pressure is greatly reduced, the improvement on the service periods of the rollers is facilitated, a set value of rolling force is reduced, the service life of the rollers is prolonged, and the risk of roller spalling is reduced.

The invention provides a method for patterning a Petri network. The method comprises the following steps of: 1, reading out fault data from a database by using a fault Petri network generation algorithm, constructing a fault Petri network, automatically generating coordinates and displaying the coordinates on an interface; and 2, reading the data on the fault Petri network displayed in the form of a pattern and storing the data into the database so as to realize storage of fault information and diagnosis information. By the method, the shortcoming that most of the conventional fault diagnosissystems manage and diagnose the faults with a simple word mode and have no self-learning functions is overcome. By using a patterned fault diagnosis technology, a maintainer can find out abnormity inadvance and immediately determine a fault reason. Sudden events can be prevented, the service expiration and the service time of equipment can be prolonged, and the cost is saved. The invention also discloses application of the method for patterning the Petri network to diagnosis of the fault of a marine gas turbine.

The invention discloses environment-friendly type transformer oil with a high ignition point and a preparation method of the transformer oil and belongs to the technical field of lubricating oil. The environment-friendly type transformer oil with the high ignition point comprises components in percentage by weight as follows: 99.5%-99.8% of high-oleic rapeseed oil, 0.1%-0.4% of an antioxidant and 0.1%-0.4% of a metal deactivator. The invention further provides a preparation method of the transformer oil. The preparation method comprises steps as follows: the high-oleic rapeseed oil is heated to 50-80 DEG C, the antioxidant and the metal deactivator are added sequentially, the materials are stirred and mixed for 1-5 h, and the transformer oil is obtained after cooling and refined filtration. The transformer oil adopts a simple process, does not contain harmful substances, is biodegradable and cannot damage the environment and the human body; the performance is stable, good stability is kept between different batches, the ignition point is high, and risks of fire disasters and explosions are effectively reduced; the addition quantity of the antioxidant is low, the service period is long, and the transformer oil has excellent physicochemical and dielectric properties and meets the requirement of national standard.

The invention relates to an intrinsic self-repairing and recyclable polythiourea polymer, and a preparation method and an application thereof. The polythiourea polymer is composed of the following components in parts by weight: 1.9 to 24.5 parts of a diamine monomer, 3.7 to 5.9 parts of a diisothiocyanate monomer and 0.07 to 2.2 parts of an amine monomer crosslinking agent; the functionality of the amine monomer crosslinking agent is greater than 2. The polythiourea polymer provided by the invention contains a characteristic dynamic reversible thiourea bond unit, and endows the polythiourea polymer material with thermotropic reversible self-repairing and solid crushing or solvent degradation recoquite properties, so that the use stability of the material is enhanced, and the service life of the material is prolonged. The preparation method provided by the invention is simple in process, the thermal reversible temperature range of thiourea bonds is wide (35-120 DEG C), and no additionalcatalyst is needed.

The invention discloses a nano-imprinting forming and pressure-print hole-forming method of a metal sheet. The method comprises the steps of grinding a taper angle a and a tip blunt circle radius R of a diamond pressure head according to indexes phi of different formed holes in the bottom of the metal sheet; judging a specific position, being contacted with the upper surface of the metal sheet, of the tip end of the diamond pressure head by utilizing a measurement device; controlling the diamond pressure head to press continuously through a Z-direction nano servo lifting platform, ensuring a material inside the metal sheet to do lateral plastic flow motion under the combined effect of the taper angle of the pressure head and a bottom hard glass substrate, forming the holes with the taper being the taper angle alpha, and breaking the bottoms of the holes to form a large hole; and accurately judging the hole-forming signal characteristic of the bottom of the thin metal sheet pressed by the diamond pressure head, and feeding back a continuous pressing quantity delta h of the Z-directional nano servo lifting platform.

The invention discloses a comprehensive control method for the pressure position of a hot continuous rolling rolled side guide plate. At the head of all-variety strip steel, side guide plate head alignment pre-positioning control is conducted according to the finish rolling incoming material plate shape and the transverse vibration situation; for thin-specification plain carbon steel, the cold state width value is calculated at the corresponding rolling target temperature through an instrument, side guide plate middle position control is achieved; for thick-specification high-strength steel, side guide plate middle pressure closed-loop control is achieved; and at the tail of the all-variety strip steel, automatic side guide plate tail pressure closed-loop control is achieved according to the strip steel tail deflection direction. In the whole rolling period, the actual positions of the head and the tail of the strip steel are tracked in real time, and accordingly corresponding actionsare executed. Since the comprehensive control method is input, the on-machine service time of a rolled side guide plate is seven days; the cold-rolled raw material edge breaking material return rate is reduced to 0.46%, the thin-specification plain carbon steel roll head tower-form maximum value is reduced to 30 mm, and steel roll middle maximum roll-shaped sawteeth are reduced to 2 mm; and the abnormal roll shape occurrence rate is reduced to 1.52%.

The invention relates to an optimization design method for a blade root, in particular to the optimization design method for the blade root of a compound propeller blade, and aims to solve the problem that molded surfaces between adjacent propeller blades are often overlapped when a blade root connection form designed by the conventional design method is applied to a ship propeller, and the diameter of a propeller hub is relatively smaller, so that the propeller blades and the propeller hub cannot meet the use requirements. The optimization design method comprises the following steps: drawing a geometrical model of a compound propeller through a three-dimensional entity configuration software; calculating the hydrodynamic performance of the compound propeller by utilizing an RANS (Reynolds-Averaged Navier-Stokes) equation so as to build a geometrical model of the compound propeller blade with the wedge-shaped blade root; and calculating stress distribution of the propeller blade and the blade root through a finite element analysis software so as to finally finish optimization design of the blade root. The optimization design method is applied to transportation tools such as naval vessels.

The invention relates to a polymer wax powder with a self-repairing function, and a preparation method thereof. The polymer wax powder is prepared from, by weight, 55-75 parts of polyethylene wax, 1-20 parts of allyl bisphenol A epoxy resin, 0.5-2 parts of hydroxyalkylamide, 0.5-5 parts of a silane coupling agent, 5-25 parts of carboxyl-terminated saturated polyester and 0.5-5 parts of an accelerant. The preparation method comprises the steps of ingredient mixing, melt extrusion, micronization, electron irradiation crosslinking and the like. The composite polymer wax micro-powder with the average particle size of 1-75 [mu]m can be prepared, and the wax micro-powder can be used as a polyester or epoxy polyester powder coating self-repairing functional additive to improve the surface hardness of a powder coating, enhance the stain resistance and make the coating material have the self-repairing function.

The invention discloses a self-aligning thrust bearing for a submerged pump, which comprises a disc-shaped pedestal and at least two thrust bearing blocks uniformly distributed on the circumference of the pedestal; the thrust bearing bocks are composed of bases which are made of metal materials and friction sheets made of high molecular materials; at least one concave waterway is arranged on the surfaces of the friction sheets; a boss is arranged in the middles of the bottom surfaces of the bases; the boss is contacted with the pedestal; and the thrust bearing blocks are provided with clamping mechanisms to fix the thrust bearing blocks on the pedestal. The self-aligning thrust bearing aims at turning a fixing plane type thrust bearing into a self-aligning thrust bearing by changing the structure form of the original design; owing to the design of the boss at the bottom of the thrust bearing, the thrust bearing blocks are inclined to modify the matching precision, so as to remarkably increases the contact area of the thrust bearing blocks and reduce the pressure; the multiple movable friction blocks are synchronously abraded, thereby greatly prolonging the service life of the submerged electric pump. The processing part is simple and easy to realize and is comparatively low in cost; and with application of the self-aligning thrust bearing, the service life of the product is prolonged.

The invention relates to a method for performing stainless steel strip-electrode submerged-arc build-up welding on low-alloy parent steel. The method comprises the following steps: S1, performing preheating before welding, and performing first-layer stainless steel strip-electrode submerged-arc build-up welding on a surface to be subjected to build-up welding, of the low-alloy parent steel, so as to form a first stainless steel build-up welding layer; S2, performing post-heating treatment; S3, performing second-layer stainless steel strip-electrode submerged-arc build-up welding and third-layer stainless steel strip-electrode submerged-arc build-up welding on the first stainless steel build-up welding layer so as to form a second stainless steel strip-electrode submerged-arc build-up welding layer and a third stainless steel strip-electrode submerged-arc build-up welding layer; and S4, performing postwelding heat treatment. According to the method, the thicknesses of hardening layers of transition regions of stainless steel strip-electrode submerged-arc build-up welding joints are effectively controlled by controlling preheating temperature, interlayer temperature, welding currents, welding voltages, welding speed, temperature of post-heating treatment, time of post-heating treatment, temperature of postwelding heat treatment and time of postwelding heat treatment, so that the thicknesses of the hardening layers are reduced by over 50%; the bonding strength of the build-up welding layers and the parent steel is improved; the problem that in the prior art, a stainless build-up welding layer on the low-alloy parent steel can crack, and even be stripped off, at a stainless steel strip-electrode submerged-arc build-up welding joint is solved.