378results about How to "Reduce size" patented technology

The invention discloses a method for maintaining DC equalization of a high-voltage cascade energy storage system by using grounding switch backflow, and the method comprises the steps: collecting the data of a battery cell in a battery cluster in real time through a battery management system, carrying out the statistics of the voltage and current data of a battery cluster end, and uploading the data to a system main controller for calculation; the system main controller judges the state of each phase when the current is balanced according to the current battery data statistical state of each phase, and controls the on-off state of the MOSFET in each power module in the corresponding state; after the total charging or discharging current of each phase of battery cluster is determined, the cluster controller of each battery cluster controls the duty ratio of the MOSFET according to the current state of each battery PACK; and after the battery PACK receives the duty ratio parameter issued by the cluster controller, the output waveform of the MOSFET is modulated, and finally multi-level current equalization is realized. According to the invention, the duty ratio of the power module is controlled by applying a strategy, and the magnitude of equalization current between PACKs is controlled, so that multi-stage SOC equalization of the PACKs, clusters, bridge arms and phases is realized.

The invention discloses a zigzag structure-based low-pass high-absorption energy selection surface, which comprises a plurality of periodically distributed units, each unit sequentially comprises a frequency selection layer, a dielectric layer and an energy selection layer from top to bottom, the frequency selection layer comprises a first dielectric substrate and a plurality of metal zigzag structures and resistors on the upper surface and the lower surface of the first dielectric substrate, and the metal zigzag structures and the resistors are arranged on the upper surface and the lower surface of the first dielectric substrate. The selectable layer comprises a second dielectric substrate, and a plurality of metal block structures and diodes on the upper surface of the second dielectric substrate; and the frequency selection layer and the selectable layer are separated by the dielectric layer. The energy selection surface and the frequency selection surface are matched in impedance through the dielectric layer, so that when low-power electromagnetic waves are incident, a low-frequency passband with low insertion loss is realized, and a relatively wide absorption frequency band is formed outside the passband; and when high-power electromagnetic waves are incident, a reflection frequency band with relatively high shielding effectiveness is realized in a working frequency band, and a relatively wide absorption frequency band is formed outside the band. The device is simple and clear in overall design structure principle and has a wide application prospect.

The invention relates to the technical field of engineering technology, and provides an accropode lifting appliance and a lifting method.The accropode lifting appliance comprises a lifting frame, a first lifting chain set and a second lifting chain set, the first lifting chain set comprises two first chains, the two first chains are arranged at the two ends of the lifting frame respectively, and the two ends of each first chain are connected to the lifting frame; the first chains and the hanging bracket are combined to form a binding area for binding the middle part, and the hanging bracket is connected with the two ends of the middle part through the two first chains; the second lifting chain set comprises two second chains which are arranged at the two ends of the lifting frame respectively, one end of each second chain is connected to the lifting frame, the other end of each second chain is used for being connected with a crane, and the lengths of the two second chains are set to be different. According to the accropode lifting appliance, the working efficiency of accropode placement can be improved.

The invention provides a high-entropy multi-diluent electrolyte which comprises a first diluent and a second diluent, the first diluent comprises a silane compound which does not dissolve lithium salt and a derivative of the silane compound, and the second diluent comprises at least one of halogenated ether, a derivative of halogenated ether, benzene and a derivative of benzene. The double diluents promote decomposition of lithium salt to form fluorine-containing SEI, so that formation of lithium dendrites is inhibited, and compared with a traditional low-concentration electrolyte and a single-diluent local high-concentration electrolyte, the high-entropy double-diluted local high-concentration electrolyte can prolong the cycle life of a lithium battery and improve the ionic conductivity of the electrolyte.

The invention discloses a cotton nitrogen content prediction method and system based on small sample hyperspectral data, and belongs to the field of agricultural information. And carrying out destructive and non-destructive hyperspectral data sampling work every fixed time after about 30 days of cotton seedling emergence. According to the method, the 1D-CNN and DF monitoring models suitable for small samples are adopted, so that the characteristics that the agronomic samples are difficult to obtain and the volume is small are met; then, a sequential sequence of the nitrogen content of the cotton leaves is generated through the optimal monitoring model, the sequential sequence is substituted into a sequential prediction structure integrated by TCN, LSTM, BiLSTM and Transform in a sliding window mode, and the nitrogen content in a period of time in the future is accurately predicted by combining the advantages of different algorithms. The method provides method support for crop phenotype parameter time sequence prediction and crop production precise quantification management, and contributes to agricultural modernization and sustainable development.

The utility model discloses a fisheye flat gasket stamping die which is characterized in that a fisheye extruding station, a punching station, a blanking station and a guide pin mounting station are correspondingly arranged on a concave die plate, a lower base plate and a lower die plate at the lower end part of the die; the female die plate is further provided with a conical rod mounting station and a guide punching rod avoiding station. And a fisheye extruding mounting station, a punching mounting station and a blanking mounting station which are respectively arranged corresponding to the fisheye extruding station, the punching station and the blanking station are arranged on a stripping template and an upper fixing plate at the lower end part of the die. The stripping template is further provided with a conical rod avoiding station, a guide pin avoiding station and a guide punching rod installing station which correspond to the conical rod installing station, the guide pin installing station and the guide punching rod avoiding station respectively. The punching die is high in punching efficiency, the material utilization rate can be remarkably increased, the high precision of the surface parallelism and planeness of the fisheye flat gasket can be guaranteed, and the punching die can be produced in a large scale.

The invention belongs to the technical field of deep learning, and particularly discloses a model post-training quantification method and system based on Pareto optimization. Through the application, the weight and activation in the pre-trained floating point model are converted into integers with low bit width, the size and precision of the model are simultaneously optimized by utilizing the Pareto thought, and the comprehensive loss of multiple targets is minimum by constructing the joint loss function and calculating the Pareto plane, so that a Pareto optimal state is achieved; and then a balance point with the shortest actual reasoning time is screened out as a final quantification result, so that the improvement of the compression ratio of the model and the reasoning acceleration on resource-limited equipment are realized on the premise of ensuring the precision of the model.

The invention discloses a bow net offline electromagnetic interference multichannel data acquisition and analysis method and device, and belongs to the technical field of electromagnetic interference test and analysis. A transient electromagnetic signal of pantograph-catenary discharge is acquired through cooperation of multiple antennas, multiple probes and multiple channels, and strict alignment of multi-source data under the same discharge event is realized through unified triggering and time base line unification; in the off-line stage, denoising, feature extraction and multi-event statistical modeling are carried out on data generated by triggering, so that multi-path and multi-mode electromagnetic characteristics of pantograph-catenary discharge and statistical laws of the multi-path and multi-mode electromagnetic characteristics of pantograph-catenary discharge are obtained; the device comprises a data acquisition unit, a synchronous trigger unit, an analysis processing unit and an interactive display unit, and can improve data processing efficiency and analysis depth while ensuring high sampling rate and broadband coverage; the device solves the problems of insufficient space coverage, poor synchronism and limited analysis capability in the existing pantograph-catenary discharge test, and is suitable for pantograph-catenary discharge mechanism research, electromagnetic interference evaluation and related engineering application.

The invention discloses a micro-drip-irrigation three-dimensional soil fixation mesh pad and a preparation method thereof, and relates to the technical field of ecological environment protection, the micro-drip-irrigation three-dimensional soil fixation mesh pad comprises an irrigation device and a three-dimensional soil fixation mesh pad, and further comprises a micro-drip-irrigation assembly connected with the three-dimensional soil fixation mesh pad, the micro-drip irrigation assembly comprises a plurality of reinforcing ribs used for transmitting fluid and a plurality of micro-drip irrigation switches arranged on the reinforcing ribs, and the micro-drip irrigation switches are used for controlling the speed of sucking the fluid from the reinforcing ribs; the problem that irrigation is uneven due to the fact that an irrigation line of an existing three-dimensional geonet pad irrigation device is long is solved.

According to the uniform and fine grinding structure, the relative position between a grinding wheel and a pipe is fixed through an adjusting assembly, the surface of the pipe is ground through a grinding assembly, and a lifting handle drives the whole device to rotate around the central axis of the pipe; and therefore, the surface of the pipe can be uniformly and finely ground twice. The grinding device is characterized in that the grinding device is composed of a grinding assembly and an adjusting assembly, the grinding assembly is composed of arc-shaped baffles, a protection plate, a connecting plate, a first grinding motor, a first grinding wheel, a second grinding motor and a second grinding wheel, the two arc-shaped baffles are fixedly arranged at the two ends of the protection plate respectively, the protection plate is of a U-shaped structure, and a threaded hole is formed in the middle of the protection plate; brushes are arranged on the two side edges of an opening of each arc-shaped baffle, connecting plates are fixedly arranged at the two ends of each arc-shaped baffle, and the first grinding motor is fixedly arranged on the connecting plate corresponding to one arc-shaped baffle.

The invention relates to the technical field of cutting, and provides a broken bridge aluminum door and window assembling and processing machine which comprises a base, a first motor is fixedly installed on the front portion of the base, a first threaded rod is fixedly installed at the output end of the first motor, a first sleeve is installed on the surface of the first threaded rod in a threaded mode, and a connecting rod is fixedly installed on the circumferential face of the first sleeve. A support is fixedly installed at the top of the connecting rod, a second motor is fixedly installed at the top of the support, a second threaded rod is fixedly installed at the output end of the second motor and is in threaded connection with a second sleeve, an electric push rod is fixedly installed on the circumferential face of the second sleeve, and laser cutting equipment is fixedly installed at the output end of the electric push rod. And a protection device is arranged at the top of the base. According to the technical scheme, the problem that in the prior art, when equipment works, workers are accidentally injured or other objects interfere with the equipment is solved.

According to the technical scheme, the sheltering device is characterized by comprising a plurality of layers of flexible rope nets, the rope nets are horizontally arranged and arranged in the vertical direction, the rope nets are sequentially connected, the two sides of the rope net on the top layer are connected with supporting rods respectively, the supporting rods are connected with floating blocks, and the floating blocks are connected with the rope nets on the bottom layer. The rope net on the bottom layer is connected with a sinking block, and a telescopic piece is connected between the supporting rods and used for adjusting the distance between the two supporting rods. The multi-layer rope net can provide rest and sheltering for shrimps in the molting period in a culture water body and avoid similar disabilities, and the telescopic piece is arranged so that the distance between the supporting rods can be adjusted at any time, and therefore the size of meshes of the rope net can be adjusted, and the multi-layer rope net can adapt to shrimps of different specifications and growth stages.

The application discloses a nuclear power steam generator thermocouple wire and fixing piece bending device. The device clamps and fixes two ends of the fixing piece respectively, inserts the thermocouple wire into the fixing piece, and realizes S-shaped bending of the thermocouple wire and the fixing piece by pressing one end of the fixing piece. In the bending process, the bending slider and the lower clamping plate of the hot end realize smooth guiding to the fixing piece, so that no indentation is caused on the hot end thermocouple wire, and the internal thermal sensing wire of the thermocouple wire is not damaged. The bending size can be determined by measuring the distance of the bending slider extending out of the shell.

The utility model relates to automatic vending machine technical field, especially automatic vending machine's storage carousel, including the fixed frame, the rotatory setting of fixed frame has the carousel, the circumferential surface of carousel is opened the annular groove, the annular groove is evenly distributed with a plurality of baffle in the circumferential direction, form a storage compartment between every two adjacent baffle, the upper and lower two inner side walls of annular groove and the position of baffle correspondingly all are opened the guide groove, the guide groove extends along the radial of carousel, and the baffle and guide groove slide fit, and the baffle is equipped with locking mechanism, and locking mechanism is used for locking or unlocking baffle and moves relative to carousel. The automatic vending machine storage carousel of the utility model aims at solving the technical problem that the goods specification is too single due to the baffle unable to freely dismount in the prior art, and the size of storage compartment cannot be freely adjusted according to the demand, thereby limit the commodity kind storage.

The invention discloses a bottom supporting device of a digital television, and relates to the technical field of digital television supporting equipment, the bottom supporting device comprises the digital television, and the bottom of the digital television is provided with a supporting piece; the supporting piece comprises a control table, the control table is located in the center of the lower portion of the digital television, adjusting strips are symmetrically connected to the two sides of the control table through adjusting pieces, the bottom of the digital television is aligned to the supporting piece, the adjusting strips are pulled, and angle blocks fixedly connected to the two ends of the two adjusting strips abut against the two sides of the digital television in a limited mode. The adjusting strip and the angle block move back under the resilience force of the spring to fix and limit the digital television, the digital televisions of different sizes can be effectively supported and fixed by adopting the mode, and after the digital televisions are limited and fixed by adopting the mode, the digital televisions can be conveniently fixed. The threaded connection block just faces a threaded installation hole, corresponding to the threaded connection block, in the digital television, installation of the digital television is facilitated, adaptability is wide, and the digital television is more practical.

The application relates to the technical field of anti-quantum cryptography, in particular to a signature certificate issuing method and system based on a trusted center and electronic equipment, which comprises the following steps: obtaining a certificate signature request sent by an intermediate certificate issuing agency; performing abstract calculation on the public key in the certificate signature request based on an anti-quantum hash algorithm to obtain a public key abstract, and performing hash operation on a first signature value to obtain a signature abstract; the first signature value is obtained by signing the certificate signature request based on a root certificate by using a hash signature algorithm; determining the public key abstract, the signature abstract and the address of the trusted center as index parameters, and sending the index parameters to the root certificate; the root certificate constructs a signature certificate according to the index parameters and issues the signature certificate to the intermediate certificate issuing agency; the existing certificate signature mode is replaced by the mode of constructing the index parameters, the size of the post-quantum digital certificate is reduced, and the certificate verification efficiency is improved.

The utility model discloses a copper pipe copper fin radiator of double core body relates to the technical field of heat dissipation appliance, including the air intake storehouse, and the air intake mechanism is installed in the air intake storehouse, and the first heat dissipation storehouse is installed to the air intake storehouse rear end, and the second heat dissipation storehouse is installed to the first heat dissipation storehouse rear end, the utility model discloses a series connection structure of first finned tube and second finned tube, can adjust to smaller height and width size when reaching the same heat dissipation performance, and then reduce the size of device, can avoid the high transportation cost caused by the size limit of standard container, satisfy the installation requirement under the specific working condition, and convenient transportation reduces transportation cost, through first filling opening, second filling opening, drain pipe position and the air direction of air inlet fan show "backflow" tendency, convenient for making the heat dissipation fin and air contact area greater, and then improve its heat exchange efficiency, reduce the heat dissipation power consumption, energy -concerving and environment -protective, finally solve the problem that the device size is too big and leads to high transportation cost and high equipment operation energy consumption.

In order to obtain an erasing tool capable of erasing an erasing target within an accurate range and to obtain an erasing tool having a size suitable for a microcapsule magnetophoretic display, the present invention is an erasing tool for scanning a recording surface of a microcapsule magnetophoretic display and erasing a magnetic recording display body displayed on the microcapsule magnetophoretic display, as an erasing unit, uses a multi-pole magnetized rubber magnet (2), sets one face of the multi-pole magnetized rubber magnet (2) as an erasing face side (3) for scanning a recording surface of a microcapsule magnetophoretic display and erasing a magnetic recording display body displayed on the recording surface, and controls the density of magnetic lines emitted from the erasing face side (3) to be a magnetic force suitable for causing magnetic particles in the microcapsule to condense in the center of the microcapsule.

This invention proposes a hysteresis compensation control method for high-speed switching valves based on PWM, belonging to the field of high-speed switching valve control. Its key feature is that the working cycle of the high-speed switching valve is divided into four stages. The rising and falling edges of the reference PWM control the opening and closing times of the high-speed switching valve, while the loading signal consists of on-compensation PWM, excitation PWM, opening-hold PWM, and closing compensation PWM. By varying the pressure before the valve, the critical voltage values ​​for opening and closing the valve core are obtained, thereby controlling the amplitudes of the on-compensation PWM and opening-hold PWM to reduce the hysteresis time and current consumption of the valve core response. The duty cycle of the excitation PWM is determined by the derivative of the pressure before the valve, and the duty cycles of the on-compensation PWM and closing compensation PWM are obtained based on the coil current, accelerating the valve core response speed and optimizing current consumption. This invention can improve the response speed of high-speed switching valves, reduce energy consumption, and expand the frequency response range, offering advantages such as high response, low power consumption, low cost, and small footprint.

The utility model relates to the technical field of food processing machinery, in particular to a bowl-steamed uncongealed beancurd machine which comprises a box body, a front box door is hinged and fixed to the opening side of the box body, a water storage tank is arranged at the bottom in an inner cavity of the box body, an electric heating module is installed in the water storage tank, a supporting bottom frame is placed in the electric heating module, and the supporting bottom frame is connected with the box body. Two sets of supporting strips are symmetrically formed on the inner wall of the box body, each set of supporting strips are arranged at equal intervals, and a plurality of containing layer plates which are sequentially placed on the supporting bottom frame and the supporting strips are placed in the box body. The uncongealed beancurd machine has the beneficial effects that the fetching box door is arranged on the front box door, so that when steamed uncongealed beancurd is taken out, only the small window is opened, the loss of heat in the machine is reduced, and the heat preservation time is prolonged; the placing laminates for placing the uncongealed beancurd bowls are designed in a split mode, the size of a single laminate is reduced, the idle placing laminates can be directly taken out when the uncongealed beancurd bowls are taken out, taking out of other uncongealed beancurd bowls is not affected, and use is convenient.

The application provides a pixel circuit and a driving method thereof and a display device, and relates to the technical field of display. The pixel circuit comprises a driving module, a first light-emitting control module, a second light-emitting control module, a light-emitting module and a shunt module. When the first light-emitting control module is turned on, a first power supply end provides a power supply signal for the driving module. The driving module provides a driving current to the shunt module and the light-emitting module in a turned-on state based on the power supply signal. The driving current comprises a shunt current shunted to the shunt module and a light-emitting current shunted to the light-emitting module. The shunt module is connected with a driving integrated circuit through a shunt signal end to receive a shunt signal emitted by the driving integrated circuit. The driving integrated circuit is configured to adjust the size of the shunt current through the shunt signal. The application accurately controls the driving current, and avoids screen color deviation and uneven brightness distribution.

The invention relates to the field of tapping machines, and discloses a tapping machine with a chipping cleaning function, which comprises a base, a tapping box, a tapping device, a chipping cleaning device, a waste gas treatment device and a controller, the tapping device is arranged in the tapping box, the chipping cleaning device is arranged in the base, and the waste gas treatment device is arranged in the base. The scrap cleaning device and the waste gas treatment device are arranged and interact with each other and support each other, scraps attached to the surface of the tapping head can be effectively cleaned, the situation that the abrasion quality of the tapping head is reduced due to scrap accumulation is avoided, the pause time in the machining process is shortened, the machining efficiency is improved, and the machining quality is improved. And meanwhile, the temperature of a tapping area can be reduced, the size of a heat affected area is reduced, and therefore the abrasion speed of the tapping head is reduced.

The disclosure provides a connector that can be mounted on a surface of the substrate by reflow soldering while ensuring waterproofness due to a seal member and also provides a connector assembly, a camera module, and an assembly method. An embodiment has: a cylindrical external terminal (110) extending in an axis direction; an outer bush (120) provided in close contact with the outer circumferential face of the external terminal (110); an inner bush (130) provided in close contact with the inner circumferential face of the external terminal (110); and a contact pin (140) inserted in the inner bush (130) along the axis direction inside the external terminal (110), and the outer bush (120) and the inner bush (130) have heat resistance durable against a temperature of reflow soldering performed when the connector is mounted on the substrate.

The utility model discloses an adjustable hydraulic joint which comprises a first connecting part and a second connecting part, a connecting assembly is fixedly connected between the first connecting part and the second connecting part, one end, close to the second connecting part, of the first connecting part is fixedly connected with a storage pipe, and a sealing assembly is arranged in the storage pipe. An inserting pipe is fixedly connected to the end, close to the first connecting part, of the second connecting part, a transmission assembly is in transmission connection with the middle of a pipe body of the inserting pipe, a positioning assembly is movably connected to the end, away from the storage pipe, of the pipe body of the inserting pipe, and a sealing gasket is movably connected to the interior of the storage pipe; according to the hydraulic connector, the size of a pipeline passing through an opening can be adjusted by adjusting the position of the movable plate, accurate, stable and flexible flow control can be achieved, and therefore the performance and reliability of a whole hydraulic system are improved.

The composite layer material (10) is made up of at least two laminated layers. One of outermost layers is a support film (2) that is removable from another layer and has a self-supporting property.

The application relates to a scale-inhibiting alloy and a preparation method thereof and a scale-inhibiting sheet manufactured from the scale-inhibiting alloy. The scale-inhibiting alloy comprises the following components: 55wt%-70wt% of Cu, 15wt%-30wt% of Zn, 5wt%-15wt% of Ni, 0.5wt%-3wt% of Si, 1wt%-5wt% of P, 0.001wt%-0.05wt% of a modifying element, and the balance of inevitable impurities, wherein the modifying element is one or more of B, Ti and Zr. The scale-inhibiting alloy adds the Si element for strengthening, so as to improve the mechanical properties and corrosion resistance; the Zn element is added as a negative electrode and the P element is added as a positive electrode, the alloying forms alpha phase+beta phase+multi-element brittle compound phase, can well excite the active current, and prevents the generation of water scale. The scale-inhibiting alloy has low production cost, meets the comprehensive requirements of cost, processing performance, corrosion resistance, mechanical properties, health and market acceptance of water treatment products, and has a good application prospect.

The present application relates to the technical field of steam turbine, and provides a self-adaptive sealing butt joint structure suitable for high-parameter main steam pipeline, which can adapt to a certain opening amount generated in the pipeline operation or installation process, and meanwhile, the special double-sided sealing structure can ensure that one side of the sealing surface normally works in the pipeline operation, and allows a certain displacement of the flange sealing surface in the pipeline operation. Meanwhile, since the structure can isolate the main steam pipeline sealing stress from the main steam pipeline welding or operation stress, the requirements for the number and specifications of the pipeline flange bolts can be reduced, and the structural cost is reduced. The present application well solves the steam leakage problem caused by the welding deformation and thermal deformation of the high-parameter main steam pipeline flange, and provides a new solution for the main steam pipeline sealing problem caused by the continuous improvement of the main steam parameters in the industrial turbine field.

The application relates to the sewage treatment field, in particular to a novel high-efficiency filtering device, which comprises a clear liquid chamber, an upper shunt cavity is arranged at the top of the inside of the clear liquid chamber, a lower shunt cavity is arranged at the bottom of the inside of the clear liquid chamber, a water inlet and a water outlet are further arranged on the clear liquid chamber, and the water inlet is communicated with the lower shunt cavity; in the application, the filtering pipes in the filtering device are connected in parallel first and then connected in series through a specially-designed shunt isolation plate; raw water flows in all the filtering pipes, under the action of pressure, suspended matters are intercepted through the micropores of the filtering pipes, clear water is collected in the clear liquid chamber of the filtering device, the intercepted suspended matters flow to the next-stage filtering pipe with water, the flow of the raw water is reduced, and the number of the corresponding filtering pipes is also reduced, so that the connection mode of parallel connection first and then series connection is adopted, cross-flow filtration can be realized without a cross-flow pump, and the purpose of concentrating suspended matters is achieved.

The invention relates to the technical field of medical instruments, in particular to a shoulder arthroscopy lateral position abduction traction frame which comprises a main frame, a traction rod and a traction rope, a sliding rail is vertically and fixedly installed on the main frame, a lifting block is vertically and slidably installed on the sliding rail, one end of the traction rope is fixedly connected with the lifting block through a traction assembly, and the other end of the traction assembly is fixedly connected with the traction rod. A water tank is fixedly installed on the main frame, a water outlet pipe is installed at the bottom end of the water tank, a water inlet pipe is installed at the upper end of the weight box, the water outlet pipe and the water inlet pipe are communicated through a connecting water pipe, and a water level window is formed in the side face of the weight box. And water level scales are arranged on the water level window. A medical worker can control the traction force on the arm by controlling the water level in the weight box, the situation that the traction force is too large or too small, and consequently the operation progress is affected is prevented, it is guaranteed that the operation effect is better, and the disease of a patient is thoroughly solved.

The invention relates to the technical field of safe starting of operating systems, in particular to a system signature mirror image file generation method and an equipment safe starting method. An equipment development end signs mirror image data of an operating system of equipment to obtain a digital signature of the mirror image data, the equipment development end sets identification information of the mirror image data, and the identification information is used for representing the memory position of the mirror image data in the operating system to obtain a system signature mirror image file. Namely, the system signature mirror image file of the mirror image data is generated by using the digital signature and the identification information. And finally, the equipment development end stores the system signature mirror image file on an equipment disk. When the device is started, namely the operating system of the device is started, the digital signature is directly positioned based on the identification information, and the safety of the operating system is verified by verifying the digital signature. As the identification information occupies a small memory space, the situation that the system signature mirror image file occupies the whole disk where the operating system is located due to the increase of the identification information is avoided, that is, the size of the system signature mirror image file is reduced, and the time cost required for upgrading the operating system is saved.