66results about How to "Reduce output power consumption" patented technology

The invention provides a source electrode drive device and method for a liquid crystal panel with the unequal row drive widths. An input signal decoding control unit electrically connected with multiple data signal output channels is arranged, start address signals and stop address signals of the data signal output channels are coded in the packaging process of data signal transmission and transmitted to the input signal decoding control unit, the input signal decoding control unit controls the number of the started data signal output channels according to the received start address signals and the received stop address signals of the data signal output channels so as to adjust the row drive width in the scanning process every time, the row drive width of each row can be dynamically adjusted in the scanning process, the data signals are only transmitted in pixels needing to be displayed in each row, the device and method are suitable for non-rectangular display, and the output power consumption of the liquid crystal panel is reduced. The source electrode drive device for the liquid crystal panel with the unequal row drive widths is designed on the basis of an existing drive framework and the structure is simple.

The invention provides a driving method for a display panel, a time sequence controller and a liquid crystal display. The method comprises the steps of: when detecting a picture frame to be displayed is a reloaded picture, switching the working frequency from a first frequency to a second frequency by the time sequence controller; and outputting a time sequence control signal to a source driver by using the second frequency, so that the source driver outputs a driving signal with lower frequency to drive displaying of the reloaded picture, wherein the first frequency is higher than the second frequency. The driving method can avoid too high output power consumption of the source driver when the reloaded picture is displayed and avoid temperature rise to influence the display quality.

The switching power supply circuit with protection for output short circuit comprises a source manager composed of a charge circuit, a low-voltage protection circuit, a vibrator, a sawtooth generator, source management chip integrated with PWM signal control and drive circuit, light-coupling isolating transmission circuit, and error amplifier circuit; wherein, there is also a forced starting circuit connected between vibrator and the PWM circuit to generate some switch pulse with determined duty rate to start system during the VDD varies from small to large and shut the circuit after system starts, then the feedback loop controls and adjusts switch pulse width to keep system running. This invention decreases output power consumption, saves energy, and prevents burn to eliminate hidden danger.

The embodiment of the invention discloses an energy-saving control method and system for a chilled water pump group. The energy-saving control method for the chilled water pump group comprises the steps that the most unfavorable tail-end pressure difference between a manifold and a water collector of a chilled water circulating system is calculated; the pressure difference between the two sides of a water supply and return pipeline communicated with the chilled water pump group is adjusted to the most unfavorable tail-end pressure difference by adjusting the work rotation speed of the chilled water pump group; and the pressure difference between the two sides of the water supply and return pipeline is kept equal to the most unfavorable tail-end pressure difference, and the work rotation speed of the chilled water pump group and the number of working chilled water pumps are adjusted according to energy-saving parameter control strategy of the chilled water pump group, so that the energy conservation of the chilled water pump group is reduced to the minimum, wherein energy-saving parameters comprise the working rotation speed, the number of working chilled water pumps, the power and the efficiency of the chilled water pump group. Through the adoption of the technical scheme, the work rotation speed of the chilled water pump group and the number of working chilled water pumps can be controlled comprehensively, the output efficiency of the chilled water pump group is improved, the output power of the chilled water pump group is lowered, and therefore the output power consumption of the chilled water pump group is lowered.

The invention provides a grass trimming head connected with a motor output shaft of a grass trimmer. The grass trimming head comprises a shell, a winding shaft and a support cap. One end of the shell is connected with the end of the motor output shaft, and the other end of the shell is provided with an opening. The winding shaft is arranged in the shell and rotates along with rotation of the shell. At least one end of a grass trimming rope wound on the winding shaft extends out of the shell. The support cap is rotationally arranged at the end, close to the opening, of the winding shaft and is exposed out of the shell through the opening. The service life of the grass trimming head is prolonged, output power consumption of a motor is reduced, and comfort level of users can be improved to some extent.

The embodiment of the invention discloses a Bluetooth device and a broadcast period adjustment method thereof, and a computer storage medium. The method comprises the following steps: acquiring the working state of the Bluetooth device, and adjusting a broadcast period based on the working state; and outputting data based on the adjusted broadcast period, wherein the data include an identifier which represents the position of the Bluetooth device.

The invention discloses a method for preparing composite cathode materials RBCO-xCGO of SOFC by an in-situ colloidal composite method, belongs to the field of SOFCs, particularly relates to the method for preparing the composite cathode materials RBCO-xCGO of SOFC by the in-situ colloidal composite method, and aims at solving the problems of poor mixing uniformity of the conventional mechanical mixing method and nonuniform distribution of impregnated particles of a sol impregnation method. The method comprises the following steps: 1, preparing ReBaCo2O6-delta precursor sol; 2, preparing CGO hydrosol; 3, preparing RBCO-XCGO composite materials. The cathode materials and electrolyte materials are once compounded in situ in a liquid phase system, without the step of secondary impregnation to ensure the uniformity of the composite materials. CGO nanoparticles effectively prevent agglomeration of the cathode materials in the high-temperature sintering process, thereby being beneficial to improving electrode performances.

The invention relates to the technical field of blast-furnace smelting and slag-forming process and discloses a method for controlling the sand content of a water body of a blast furnace INBA circulating system, which can control the shape and size of furnace sand particles by controlling the fluid dynamic energy in the granulating and slag-forming procedure. By the means of controlling the slag-forming water supply energy in the water supply link and the mode of controlling the shape and size of the formed slag from the beginnings of the slag-forming process to effectively capture the formed slag, the sand content of the water body of the INBA circulating system is controlled, so as to achieve the purpose of eliminating the blockage of furnace sand in the circulating system, preventing the wear damage of equipment and reducing the blast furnace slag-forming cost. The method works reliably, has obvious effects and is easy to promote and apply.

The invention discloses a silk screen detecting system of solar cells. The system comprises a cylinder barrel and a cylinder cover; a first oil pipe and a second oil pipe are arranged on the side surface of the cylinder barrel; a piston and a guide sleeve are arranged in the cylinder barrel; a piston rod is fixed in the piston; one end, towards the cylinder cover, of the piston rod movably penetrates through the guide sleeve and the cylinder cover, and is connected with an output head by a bolt; a resistance heating wire is arranged in the cylinder wall of the cylinder barrel; the outer side of the cylinder barrel is coated with a matched insulation layer; annular piston pads are arranged at two ends of the piston; the outer diameters of the annular piston pads are equal to the inner diameter of the cylinder barrel; and the inner diameters of the annular piston pads are gradually increased along the piston to two ends of the cylinder barrel. The system is provided with the annular piston pads; and in low-temperature environment, even if hydraulic oil generates the phenomenon of slow flowing speed and partial condensation to cause low acting force acted on the piston, a hydraulic oil pump can allow the device to normally work under the preconditions of not increasing excessive power consumption and providing higher output pressure.

A servo voltage regulation type temperature control device of an electric blanket or an electric heating kang is provided with a single-chip microcomputer system serving as a main body, and the single-chip microcomputer system comprises a voltage-reduction rectifying power supply 1, a keyboard set 3 and a displayer unit 6. The servo voltage regulation type temperature control device is characterized in that a single-chip microcomputer 4 is connected with an electrically-erasable nonvolatile memory 5, an INT end of the temperature control device is connected with a zero crossing detector 2, an AD input port of the temperature control device is connected with a temperature sensor 7, one output end of the temperature control device is connected with a control electrode G of a silicon controlled rectifier 9 through an optical coupler 8, the silicon controlled rectifier 9, a load and a power supply form a return circuit, a set temperature S is set through the keyboard set 3, instant temperature signals J of the load are collected through the temperature sensor 7, and instant temperatures J and the set temperature S are compared through programming so as to judge the instant temperatures J are lower than or equal to or higher than the set temperature S. Trigger delay time of the silicon controlled rectifier in each power supply period from zero crossing to triggering is prolonged or shortened according to the judgment results, the effective value of the average voltage exerted on the load is changed, and the curve of the practical temperature is the same as the curve of the set temperature.

The invention discloses a positioning and navigation device based on robot walking. The device specifically relates to the technical field of robots and comprises a baseplate, wherein side plates arefirmly disposed on two ends of the bottom of the baseplate; universal wheels are firmly disposed on bottoms of the side plates; embedding grooves are formed in the top part of the baseplate and comprise a first embedding groove and a second embedding groove; and a first gear and a second gear are disposed in the first embedding groove and the second embedding groove respectively. The device disclosed by the invention is characterized in that navigation and positioning of a robot which is walking are realized by a GPS positioner, road condition information during walking of the robot is collected by a camera, and front obstacles are detected by an infrared detector during walking of the robot, so the robot can move stably along a preset route; and in addition, the second gear can be drivenby a servo motor to rotate and can then drive rotation of the first gear, so a lantern ring can be driven to rotate and an advancing direction of the device can be adjusted between 0-360 DEG.

The invention provides a charging control method, a mobile terminal and a storage medium. When the mobile terminal is in a charging state, whether the sum of the output power consumption of the mobileterminal and the instantaneous charging power consumption of the battery exceeds the maximum power consumption of the mobile terminal is monitored in real time. If it is exceeded, the control reducesthe instantaneous charging power consumption and satisfies that the sum of the reduced instantaneous charging power consumption and the output power consumption is less than or equal to the maximum power consumption; If not exceeded, the control increases the instantaneous charging power consumption and keeps the sum of the output power consumption and the instantaneous charging power consumptionequal to or less than the maximum power consumption. By adjusting the magnitude of the instantaneous charging current, and controlling the increase and the decrease of the instantaneous charging power consumption, the fast charging is maintained under the condition of avoiding abnormality in the charging state of the mobile terminal, and the charging safety of the mobile terminal and the requirement of the user for the fast charging of the mobile terminal are met.

The invention relates to an automatic loading and unloading device for vehicles and an automatic loading and unloading vehicle. The automatic loading and unloading device comprises a lifting mechanism and a loading and unloading mechanism, wherein loading and unloading mechanisms are connected to the two sides of the lifting mechanism respectively and comprise a main oil cylinder, a landing gear and a supporting connecting rod respectively; the landing gear comprises a first hinge hole, a second hinge hole and a third hinge hole; the third hinge hole is hinged with a chassis of a tank-transport truck; one end of the main oil cylinder is hinged with the second hinge hole, and the other end of the main oil cylinder is hinged with the chassis of the tank-transport truck; and one end of the supporting connecting rod is hinged with the first hinge hole, and the other end of the supporting connecting rod is hinged with the lifting mechanism. Since the structure of the landing gear and the supporting connecting rod is adopted, a connecting rod mechanism is formed between the landing gear as well as the supporting connecting rod and the main oil cylinder as well as the lifting mechanism, and thrust force of the main oil cylinder is uniformly acted on a lifting arm; and thus, the lifting arm is slowly and stably opened or folded, and the defect of large shock produced by the lifting arm during releasing of an auxiliary oil cylinder and acting of the main oil cylinder existing in the prior art is avoided.

The invention provides a heat pump type clothes dryer and a working method thereof. The heat pump type clothes dryer works in two operating states through a double-cylinder variable-capacity compressor; when the heat pump type clothes dryer operates in one operating state, the double-cylinder variable-capacity compressor adopts a double-cylinder parallel connection mode; and when the heat pump type clothes dryer operates in the other operating state, the double-cylinder variable-capacity compressor adopts a double-cylinder serial connection mode. By the adoption of the double-cylinder variable-capacity compressor, during treatment of a relatively high moisture load in the early stage of drying clothes, the heat pump type clothes dryer can guarantee fast dehumidification and drying; under a condition that the moisture load in the later stage of drying the clothes is reduced, suction flow and exhaust flow are reduced through two-stage compression, so that stable exhaust temperature is guaranteed, and output energy consumption of a compressor motor is saved; and meanwhile, no extra configuration is needed for treating the moisture load in the later stage of drying the clothes, the size is reduced, and the use cost is decreased.

The invention discloses an information processing method and electronic equipment. The information processing method is applied to first electronic equipment and second electronic equipment, wherein the first electronic equipment is capable of communicating with the second electronic equipment; and the second electronic equipment can be charged through the first electronic equipment. The information processing method comprises the following steps: in the process of charging the second electronic equipment through the first electronic equipment, receiving, by the first electronic equipment, first information sent by the second electronic equipment according to a first strategy; judging the charging state of the second electronic equipment according to the first information and generating a first instruction when determining that the second electronic equipment is in charging abnormal state; and executing a first operation on the basis of the first instruction, wherein the first operation is used for reducing the output power consumption.

The invention discloses a deburring and grinding device for a brake disc, and particularly relates to the technical field of brake disc machining. The deburring and grinding device comprises a base plate and a cover plate which are arranged in parallel, wherein the cover plate is located at the top of the base plate, supporting legs are arranged at the bottom of the base plate, a sleeve is arranged between the base plate and the cover plate, a grinding mechanism is arranged inside the sleeve, annular inserting blocks are fixedly arranged in the middles of the top end surface and the bottom endsurface of the sleeve, and annular inserting grooves matched with the corresponding annular inserting blocks are formed in the edges of the sides, opposite to the cover plate, of the base plate. According to the deburring and grinding device, a hydraulic cylinder drives the sleeve to move upwards, then the to-be-treated surface of the brake disc makes contact with the grinding surface of a grinding disc, then the hydraulic cylinder drives a piston rod at the end part of the hydraulic cylinder to retract back till the annular inserting block at the bottom end of the sleeve is completely inserted into the annular inserting groove in the top of the base plate, and then a first disc can be driven by a servo motor to rotate to complete grinding of the to-be-ground surface of the brake disc andmounting holes.

The invention discloses a chain ring curing tool and a method for connecting a chain ring into a chain rigging, and belongs to the technical field of traction rigging, and the specific scheme is as follows: the chain ring curing tool comprises an upper inner mold, a lower inner mold, an upper outer mold and a lower outer mold, the upper inner mold and the lower inner mold are assembled into an annular mold cavity III, a notch III is formed in the annular mold cavity III, and the notch III is connected with the lower inner mold; the upper outer mold and the lower outer mold are each provided with an annular groove structure, the annular groove structures of the upper outer mold and the lower outer mold are assembled to form an annular mold cavity IV, the annular mold cavity III is located in the annular mold cavity IV, a notch IV is formed in the upper outer mold, a notch V is formed in the lower outer mold, and the notch IV is communicated with the annular groove structure of the upper outer mold where the notch IV is located. The notch V is communicated with the annular groove structure of the lower outer mold, and the notch IV and the notch V are oppositely arranged up and down. According to the invention, two sections of composite material chain rings can be quickly connected, and the continuous fiber reinforced composite material has the main advantage that the service life is prolonged on the premise of reducing the weight of the chain.

The invention relates to a power supply and discloses a low standby power loss high-power full-bridge phase shift power supply which comprises a high-power full-bridge phase shift circuit, wherein the high-power full-bridge phase shift circuit is connected with at least one auxiliary power circuit in parallel for supplying power to a load; an output loop is connected with a current sampling circuit, and the current sampling circuit is coupled with a control circuit; the control circuit is used for controlling an input circuit; and the input circuit is connected with the high-power full-bridge phase shift circuit through a PFC (Power Factor Correction) circuit. The low standby power loss high-power full-bridge phase shift power supply has the advantage of low power loss of a complete machine under the condition of no load and light load.

The invention discloses a two-to-one electric tool power converter and a conversion method thereof. The two-to-one electric tool power converter comprises an upper shell and a lower shell. The upper shell and the lower shell are connected through threads to form a shell cavity. An electric tool connecting port is formed in the top of the upper shell. A USB interface is formed in the rear portion of the lower shell, wherein the USB interface is 5V in output power and 2A in output current. The output power consumption is low. A hollow groove is formed in the middle of the front end of the lowershell. Hollow grooves are formed in the two sides of the front end of the bottom of the lower shell. Pin inserting assemblies provided with sliding grooves are arranged at the rear end of the bottom of the lower shell. The pin inserting assemblies are connected with a sliding plate inside the shell cavity to form a slidable pin inserting assembly. The pin inserting assemblies can be connected withdifferent power supply equipment, and the functions of two products are combined into one product. Therefore, the cost is greatly reduced. Based on the sliding characteristic, the pin inserting assemblies are prevented from being obstructed by each other when the pin inserting assemblies are connected with different power supplies.

The invention discloses a k-weak fence construction and mobile charging scheduling method for a wireless rechargeable sensor network. The wireless rechargeable sensor network includes a two-dimensional rectangular narrow-band region which is randomly provided with N omnidirectional sensor nodes, and a movable charging vehicle, and relevant parameters can be set according to the network scale; the method comprises the following specific steps: step 1, constructing a fence map according to information of a monitoring area; acquiring coverage radius, coverage energy consumption and position information of the sensor nodes from the area, constructing a fence map, and setting edge weight, flow and the like; step 2, solving the fence network structure by using a minimum-cost maximum-flow algorithm; step 3, finding sensor nodes forming each fence according to the information of the minimum-cost maximum-flow algorithm; step 4, calculating various parameters of the charging vehicle according to the solved fence nodes; and step 5, calculating the mark number of each fence, and determining the charging sequence. By combining the fence covering and charging requirements, the charging efficiency of the charging vehicle is improved, and the fence covering requirement is ensuredThe invention discloses a k-of a wireless rechargeable sensor network. The invention discloses a weak fence construction and mobile charging scheduling method. The method comprises the following specific steps that N omnidirectional sensor nodes and a movable charging vehicle are randomly deployed in a two-dimensional rectangular narrow-band area, and related parameters can be set according to the network scale; the method comprises the following specific steps: step 1, constructing a fence map according to monitoring area information; and obtaining the coverage radius, the coverage energy consumption and the position information of the sensor node from the area, constructing a fence diagram, and setting the edge weight, the flow and the like. And step 2, solving the fence network construction by using a minimum cost maximum flow algorithm. And step 3, according to the information of the minimum cost maximum flow algorithm, finding out the sensor node forming each fence. And step 4, calculating each parameter of the charging vehicle according to the solved fence node. And 5, calculating the mark number of each fence, and determining the charging sequence. The requirements of fence covering and charging are combined, the charging efficiency of the charging vehicle is improved, and the requirement for fence covering is met.

The invention relates to a tamping machine, which comprises an excavator and a breaking hammer, wherein an output shaft of the breaking hammer is connected with a tamping mechanism in a sliding manner, an anti-disengaging plate, an upper rubber mat, a plurality of limiting rods and a lower rubber mat are arranged on the output shaft of the breaking hammer, the tamping mechanism comprises an upperhammer plate, a lower earth tamping plate welded to the lower end of the upper hammer plate, a connecting column welded to the upper end of the upper hammer plate and sliding grooves formed in the inner wall of the connecting column, the anti-disengaging plate, the upper rubber mat, the plurality of limiting rods and the lower rubber mat are all located in the connecting column, the limiting rodsare located in the sliding grooves, the diameter of the anti-disengaging plate is the same as that of the upper rubber mat, a gap is formed between the anti-disengaging plate and the connecting column, the upper rubber mat is connected to the upper end surface of the anti-disengaging plate, and the lower rubber mat is connected to the lower end surface of the output shaft. The tamping machine canwork in various environments, the whole earth tamping mechanism cannot be lifted when the output end of the breaking hammer is lifted in the working process, the working energy consumption of the breaking hammer is greatly reduced, and the earth tamping speed is increased.

A cutting head for use with a cutting tool, such as a grass trimmer. The cutting head has a housing, a line spool and a supporting cap. One end of the housing is coupled to an end of a motor output shaft and another end has an opening. A line spool is disposed in the housing and rotates along with the housing. At least one end of a line wound around the line spool extends out of the housing. The supporting cap is rotatably disposed at the end of the line spool adjacent to the opening and is exposed to an exterior of the housing through the opening.

A panel driver integrated circuit (IC) and a cooling method of the panel driver IC are provided. The panel driver IC includes a data encoder, a level shifter, a Digital-to-Analog Converter (DAC), a rearrangement circuit and an output buffer. The data encoder receives and selectively changes an original data for outputting to the level shifter. An input terminal and an output terminal of the level shifter are coupled to an output terminal of the data encoder and a data input terminal of the DAC, respectively. The output terminals of the rearrangement circuit are respectively coupled to the reference voltage input terminals of the DAC for providing different reference voltages. The rearrangement circuit correspondingly rearranges the order of the reference voltages according to the operation of the data encoder. An input terminal of the output buffer is coupled to an output terminal of the DAC.

The invention discloses a low power consumption stand-by circuit of a tandem type LED circuit. A constant current LED driver output by a wide voltage is output to the circuit through a cable, the first electrode of a voltage-regulator tube is connected with the cathode of a one-way silicon controlled rectifier, the control electrode of the one-way silicon controlled rectifier is connected with the other electrode of the voltage-regulator tube, the one-way silicon controlled rectifier is in tandem connection with a capacitor C1 and a resistor R1 and then is connected with the other electrode of the voltage-regulator tube, and the capacitor C1 and the resistor R1 are in parallel connection. When a module is not damaged, the circuit is not triggered, and only used as the stand-by circuit, when an open circuit of a certain light source module is damaged, the stand-by circuit is forced to be triggered, the current flows through the voltage-regulator tube, the one-way silicon controlled rectifier is broken over, and according to internal resistance of the one-way silicon controlled rectifier, the break-over voltage is basically maintained below 1V. The circuit has the advantages that under the constant current, power consumption can be remarkably reduced by the low voltage, a head radiator can be removed, space is reduced, and design is simplified. Meanwhile, for the constant current LED driver output by the wide voltage, the output power consumption is also reduced, and the reduction of the power consumption is beneficial to a driving power source.

The invention discloses a rapid cooling device for healthcare wine production and a method. The rapid cooling device comprises a cooling cylinder, wherein a first motor is arranged in the center of the top of the cooling cylinder; a liquid inlet tube is arranged on one side of the first motor; the liquid inlet tube is communicated with the cooling cylinder; a first rotating shaft is fixedly connected with an end part of the output shaft of the first motor; stirring blades are uniformly distributed on a peripheral side surface of the first rotating shaft; a gas inlet tube is connected with thebottom end of one side of the cooling cylinder; a gas outlet is connected with the top end of the other side of the cooling cylinder. A cold gas is introduced into a spiral gas conveying tube throughthe gas inlet tube of the rapid cooling device, the stirring blades are driven by the first motor to stir healthcare wine in the cooling cylinder, then the healthcare wine can be uniformly cooled, andfurthermore the cooling velocity of the healthcare wine can be increased; meanwhile, a sleeve with spiral blades is driven by a second motor to rotate in a rotation direction opposite to a flowing direction of a liquid, so that the flowing effect of the healthcare wine in a conveying pipeline can be greatly degraded.

The invention discloses a ship sewage treatment device and method. The device comprises a frame, a pretreatment cylinder is fixedly arranged at the top of the frame, a motor is arranged at a top center position of the pretreatment cylinder, a water inlet pipe is arranged at one side of the motor, and a drug adding hopper is arranged at the other side of the motor. The water inlet pipe and the drugadding hopper both communicate with the pretreatment cylinder, the output shaft end of the motor is fixedly connected with a rotating shaft, and the middle part of the circumferential side of the rotating shaft is fixedly provided with agitating rods, and the bottom of the rotating shaft is provided with scrapers. A center portion of the bottom of the pretreatment cylinder is provided with a connecting pipe. The device of invention adds a drug into the pretreatment cylinder by using the drug adding hopper, and uses the motor to drive the stirring rods and the scrapers to agitate sewage with the added drug so as to precipitate some harmful substances in the sewage, then enables the sewage to be introduced into a pressure filter cylinder for pressure filtration, and at the same time, uses awater treatment mechanism to purify the filtered sewage to meet a drinking standard.

The invention relates to a mobile power supply discharge capacity control method and system. The method comprises the steps of obtaining the residual electric quantity of a mobile power supply and the residual electric quantity of each piece of to-be-charged equipment connected with a discharge interface after an access signal of any discharge interface of the mobile power supply is detected; according to the residual electric quantity of the to-be-charged equipment and the battery capacity of the to-be-charged equipment, calculating the to-be-charged electric quantity of each to-be-charged equipment when the to-be-charged equipment reaches a full-charge state; according to a preset distribution rule and the to-be-charged electric quantity of the to-be-charged equipment, respectively setting a to-be-distributed electric quantity corresponding to each to-be-charged equipment; and calculating the charged quantity of each piece of to-be-charged equipment in real time, and when the charged quantity of the to-be-charged equipment is equal to the corresponding electric quantity to be distributed, enabling the mobile power supply to stop transmitting power to the corresponding discharge interface. The method has the technical effect that the use performance of the mobile power supply is improved.

The invention discloses a potential energy recycling system and method of a higher-position extractor and belongs to the field of electric hydraulic control. The potential energy recycling system is provided with two energy accumulators. Oil port switches of the two energy accumulators are controlled by two two-position two-way electromagnetic reversing valves correspondingly; an L-shaped hook of the higher-position extractor is driven by a hydraulic cylinder; when the L-shaped hook supports a steel blank and descends, the higher-position potential energy of the steel blank is converted into hydraulic energy and most of the hydraulic energy is stored in the two energy accumulators; when the L-shaped hook ascends without a load and supports the steel blank to ascend in a loaded mode, the two energy accumulators release the stored potential energy in a staging mode through the two-position two-way electromagnetic reversing valves; the pressure difference between an oil drainage port and an oil sucking port of a hydraulic pump is reduced, the output energy consumption of a motor is lowered, and energy is saved; and the temperature of hydraulic oil in the work process can be effectively lowered, and leakage caused by rise of the oil temperature is reduced.