96results about How to "Guaranteed normal application" patented technology

The invention discloses a rigid spacecraft performer multi-fault diagnosis and fault tolerance control method. According to the method, the kinetic and dynamic model of a rigid spacecraft attitude control system is put forward, a fault model for existing of both the performance failure fault and the deviation fault of a rigid spacecraft is established, and then a fault detection observer adopting the adaptive threshold technology and a fault estimation observer based on the adaptive technology are respectively established so that online real-time detection and estimation of the fault time and the concrete situation of the fault can be realized, and finally a backstepping sliding mode fault tolerance controller is designed according to fault information established by the fault estimation observer. Attitude stabilization control of the rigid spacecraft under the condition of the performer efficiency damage and the deviation fault can be realized, and the influence of external disturbance on the system and the observers can also be considered in the design process. Besides, the fault detection observer and the fault estimation observer can be independently designed so that the engineering application can be more easily implemented.

At present, electronic devices are getting more and more popular. But, electronic devices are limited by energy of battery. Especially, it is unable to charge battery at field. Then, electronic devices are not workable. The invention transforms mechanical energy from human body movement to electric energy. The invention is related to knowledge of electromagnetics including Faraday theory of electromagnetic induction, and Lenz law. When human body movement such as walking, running, jumping etc, or hand holding, rocking or pushing etc, energy generated from these actions through each method makes rotor move in magnetic field to generate current (generator principle), or makes magnetic field change in winding to generate current (Lenz law). After being rectified, and voltage stabilized, the electric energy can charge electronic devices.

The invention belongs to the field of microbial fermentation and provides a preparation method of a ferment fertilizer product with the sweetening effect. The preparation method comprises the following steps of by taking wastes, including inferior fruits, fallen fruits, fruit residues, vegetable straw and the like in agricultural production as raw materials, utilizing a mode of multiple fermentation to finally obtain the liquid ferment fertilizer with the sweetening effect. The obtained bacterial fertilizer has very good ecological benefits, and plants can absorb and convert the bacterial fertilizer to reach the effects of rapidly supplementing plant nutrients, accumulating sugar, and thus increasing the sweetness of fruits and promoting conversion absorption of components, including vitamins, bioactive enzyme and selenium in a product, thereby reaching the purposes of reducing acid, sweetening, removing acerbity and enhancing fresh from the source.

The invention relates to a kind of encryption and deciphering method of remained difference coefficient breadth in H. 264 standard video information, it characterized in that: based on self adapting updating rule of remained difference coefficient breadth coding middle variable suffiXLength, adopting difference value absolute value which calculates current remained difference coefficient breadth and suffixLength self adapting updating threshold value, then based on the difference value absolute value, deciding bit number of last bit of the remained difference coefficient breadth which is to be encrypted, video code flow encrypted fulfill the H. 264 standard format. The characteristics of the invention are following: independent on video coder and decoder, video code flow encrypted fulfill the H. 264 standard; complexity of calculation is low, can fulfill the real time requirement of video information process and transmission; not affect the compression ratio; not affect video communication and network fault tolerant of video transmission; secrecy class can be realized; independent on concrete cryptogram arithmetic, it can use different international normal cryptogram arithmetic, the secrecy can achieve level that current technique can not decrypt.

The invention discloses water-based high-barrier coating liquid and a high-barrier film thereof. The coating liquid is prepared from a water-soluble polymer, nanometer oxide, a coupling agent and a delaying cross-linking agent, and is specifically prepared from the following components in percentage by weight: 0.5-15% of water-soluble polymer, 0.1-15% of nanometer oxide, 0.01-5% of a coupling agent, 0.01-3% of a delaying cross-linking agent, 0.01-1.5% of an auxiliary agent and 60.5-99.37% of a solvent, wherein the water-soluble polymer is a water-soluble polymer with hydroxyl, the nanometer oxide is prepared by carrying out hydrolysis-condensation on metal alkoxide by adopting a sol-gel method under an acid catalysis condition, and the coupling agent is an organic siloxane coupling agent.The prepared high-barrier coating liquid is excellent in performance and can be used as a barrier layer independently or can be used in combination with an inorganic deposition layer, so that excellent barrier performance can be achieved, and the coating liquid can be used for food packaging, medicine packaging, electronic packaging and the like.

The invention discloses an intelligent street lamp which comprises a street lamp pole, an LED lamp body, a base and a control cabinet. A transverse rod is arranged at the top end of the street lamp pole. The LED lamp body is mounted on the transverse rod. The control cabinet is arranged in the base and comprises a street lamp brightness adjusting module and an automatic detecting module. The street lamp brightness adjusting module comprises a passenger flow monitoring device and an LED lamp brightness adjuster. The automatic detecting module comprises a current detecting module, an A / D converter, and a wireless signal transmitter, the wireless signal transmitter is connected with a fault annunciator of a street lamp control center, and a GPS positioner is further mounted on the street lamp body. By adoption of the intelligent street lamp provided by the invention, the brightness of the street lamp can be adjusted based on the passenger flow according to different circumstances, the illumination function of the street lamp is fully achieved, and energy conservation and emission reduction can also be achieved; and meanwhile, an illuminating circuit can be automatically detected, if faults occur, the street lamp control center can receive an alarm in time and send for maintenance personnel to conduct detection and maintenance on site, and normal application of the street lamp is guaranteed.

The invention relates to a protective cover for protecting the worm fan engine of plane, which comprises a frame (1) at the front of engine (A), a gas hole (2) on the frame (1) to guide air, a fixing belt (3) at the end of frame 91) to fix the frame (1), a bolt hole on the fixing belt (3), and a support (5) inside the frame (1) to connect the inner wall and support the frame, wherein there are two gas holes (2A, 2B). The frame (1) can reduce the air resistance and improve the anti-impact ability; the gas hole (2) can supply air to the engine (A); the fixing belt (3) and bolt hole (4) can fix and connect the protective cover and engine (A); and the support (5) can strengthen the frame.

The invention provides a download and treatment system and a method of initial filtering rule, wherein, a calling conversation control function entity and a home subscriber server both support shared initial filtering rule set. The system includes: an initial filtering rule setup device, positioned on the side of the home subscriber server and used in the setting up of initial filtering rule activation list in business configuration data, in order to present the activate state relevant to the initial filtering rule of the shared initial filtering rule set; a download and treatment device, positioned on the side of the service calling conversation control function entity and used to download business configuration data from home subscriber server and obtaining the activate state of the initial filtering rule relevant to the shared initial filtering rule set in the activation list of the initial filter rule according to the business configuration data, as well as carrying out subsequent treatment.

The invention discloses a device and a method for a rainfall test of a transmission line tower. The device comprises a tower, wires, nozzles, a water supply device and a power supply device. The wires are fixed in the tower, and the nozzles are located above the wires and fixed right under the tower. The power supply device supplies power to the wires, the nozzles are connected with the water supply device, and the tower and the wires are sprayed with water to simulate various states in the rain. The water supply device comprises a water pump and a water tank. The method for the rainfall test includes nozzles required in the test are selected to be fixed right under the tower, the power supply device supplies power for the wires, the water tank and the water pump are used for providing water for the nozzles which spray water to the tower and the wires to simulate various states in the rain to perform the rainfall test. The rainfall test provided by device and the method is wide in voltage ranges, adjustable in rainfalls and adjustable in acidity of the rainfalls, and is applicable to transmission line towers with a voltage class of over 110 kV (kilovolt)..

The invention provides a waterproof sound-transmitting membrane assembly capable of being normally used 100 meters underwater. The assembly comprises a first waterproof layer and a second support layer. An interval d exists between the first waterproof layer and the second support layer, the first waterproof layer comprises a waterproof section, and the diameter length of the waterproof section isD. The relative deformation amount E of the waterproof section is equal to (2d + AD) / D and is not greater than the elastic limit relative deformation amount S of the waterproof section when the waterproof section is subjected to the water pressure of 1MPa, wherein A is the relative deformation of the second support layer under the action of 1MPa water pressure. The range of the elastic limit relative deformation S of the waterproof section is 1%-30%. The first waterproof layer has the characteristics of high hydrophobicity, excellent chemical resistance, insulativity and the like, and the second support layer has relatively high elastic limit pressure and is used for providing a supporting effect for the first waterproof layer. The waterproof sound-transmitting membrane assembly can resist the influence of 1MPa (100m water pressure), and can still play a waterproof and sound-transmitting role when the water pressure is 100m underwater, so that the normal application of electronic device is ensured.

The invention discloses a yield anchor cable spherical rotating and aligning device which is characterized by comprising a semi-spherical tray, an anchorage device ring, an anchorage device clamping sheet and a ball center roller. The semi-spherical tray comprises a tray main body which is approximate to a hollow semi-spherical shape; an annular flat bottom face which is in contact with a tunnel wall surface is arranged on the rim of the tray main body; the wall thickness of the tray main body is gradually increased from the edge to the center; a spherical groove is arranged at the center of the tray main body; the ball center roller is arranged inside the spherical groove, and rotates inside the spherical groove; the ball center roller is provided with a columnar axis hole; the anchorage device ring is located at the outer side of the center of the tray main body; the anchorage device ring is in contact with the tray main body, and the inner port part of the anchorage device ring can adapt to the outer wall face of the tray main body, so that the anchorage device ring can move in a sliding manner; and the anchorage device clamping sheet is matched with the outer end opening of the anchorage device ring, so that an anchor cable is fixedly arranged on the anchorage device ring by passing through the axis hole of the ball center roller and the inner ring opening of the anchorage device ring. By utilizing the yield anchor cable spherical rotating and aligning device provided by the invention, the anchor cable support with different mounting angles under high-strain stress can be solved.

The invention discloses an integrated two-way low-friction drag stay rope node of a suspension rope single-layer latticed shell structure. The node comprises A direction lug plates and at least one A direction pulley arranged along rigid rods in one direction of a rigid latticed shell, and B direction lug plates and at least one B direction pulley arranged along rigid rods in the other direction of the rigid latticed shell, wherein the A direction pulleys are rotationally connected to the A direction lug plates arranged at the two sides thereof through A direction pin shafts; the B direction pulleys are rotationally connected to the B direction lug plates arranged at the two sides thereof through B direction pin shafts; the A direction lug plates and the B direction lug plates are synchronously and fixedly connected above or below the rigid latticed shell; and stay ropes in two directions are respectively and tightly bonded below the corresponding A direction pulleys or B direction pulleys. The node uses the fit between the stay ropes and the pulleys for achieving the lower support or upper suspension effect on the rigid latticed shell, so that the reliable connection between the stay ropes and the rigid latticed shell is guaranteed, and the prestress application of the stay ropes in the construction tensile process is guaranteed.

The invention provides a method of initial filtering rule download and processing, which includes: users are configured with the shared initial filtering rule set and dynamic business activation information in the business configuration data in business reservation under the situation of CSCF and HSS supporting shared initial filtering rule set; users sign the business on AS and transmits the dynamic business activation information to HSS by AS; HSS dynamically selects explicit or implicit download or not download the initial filtering rule relevant to shared initial filtering rule set and downloads the business configuration data to CSCF, according to the actual application situation of the initial filtering rule set of the dynamic business activation information and the relevant initial filtering rule set relevant to the shared initial filtering rule set. CSCF replaces original initial filtering rule with specific initial filtering rule and guarantees the business configuration data, according to the specific initial filtering rule relevant to the shared initial filtering rule set inquiry and the shared initial filtering rule set in the business configuration data.

The embodiment of the invention relates to the field of mobile terminals and discloses a mobile terminal and a control method thereof. The mobile terminal comprises a front shell, a touch screen, a camera and a receiver, wherein the touch screen is arranged on one side of the front shell. The mobile terminal also comprises a push-out mechanism; the push-out mechanism is provided with the camera and the receiver and arranged on the side of the front shell, which is away from the touch screen; the push-out mechanism can move in the length direction of the mobile terminal, the moving path of thepush-out mechanism is provided with a working position and a recovery position, and when the push-out mechanism moves to the working position, the camera and / or the receiver can be exposed out of thefront shell of the mobile terminal, and the number of the devices on the front surface of the mobile terminal can be reduced as much as possible to further improve the screen-to-body ratio.

The invention provides an Internet of Things device, an Internet of Things platform, an Internet of Things platform access method and an Internet of Things platform access device. According to the Internet of Things equipment provided by the invention, on one hand, the encrypted information can be cached when the Internet of Things equipment is not connected with the server; on the other hand, theencrypted information can be cached and sent to the server when the terminal is connected with the server; and clearing the cached encrypted message in response to a first response message sent by the server. Based on the design, the Internet of Things equipment can ensure that data information is not lost so as to ensure the practical application of an Internet of Things platform.

The invention discloses a flexible and configurable electronic archives area authorization method and system, which receives an application access request and responds to and answers the application access request. Receiving a request for application data, responding to the request for application data, and responding to the request for application data; When responding to and responding to the application access request and the application data request, drawing occlusion to one or more areas of the electronic archive by an authorization tool, and realizing the sub-area authorization; The authorization information is saved in the form of string so as to recover the authorization information when consulting the archives. The invention can not only scientifically and effectively resist riskssuch as hacker attack, artificial destruction, virus intrusion, transmission loss and the like, ensure standardization and standardization of links such as electronic file receiving, identification,storage, application and the like, but also self-define the control of inquiry area authority, log and the like, and support various electronic file formats.

The invention discloses processing system and method for recovering phosphorus from excess sludge obtained after municipal sewage treatment. The processing system comprises a mixed tank, an anaerobic phosphorus releasing tank, a sand filtering tank, a chemical reaction tank, a settling tank, a sludge concentration tank and a sludge dewatering machine, wherein the mixed tank is sequentially connected with the anaerobic phosphorus releasing tank, the sand filtering tank, the chemical reaction tank and the settling tank and is provided with a carbon source inlet and an alkali liquor inlet; the mixed tank and the anaerobic phosphorus releasing tank are both internally provided with stirring equipment; the chemical reaction tank is provided with a phosphorus removing agent inlet; the sludge discharge opening of the settling tank is connected with the sludge concentration tank; the sludge discharge opening of the sludge concentration tank is connected with the sludge dewatering machine; and the sludge outlet of the sludge dewatering machine is used as an output port. The processing system greatly enhances the phosphorus releasing rate of the sludge by arranging the stirring equipment in the anaerobic phosphorus releasing tank and solves the problem of higher concentration of suspended matters contained in the supernate of the anaerobic phosphorus releasing tank by additionally arranging the sand filtering tank behind the anaerobic phosphorus releasing tank, thereby enabling the recovered phosphorus resources to be cleaner.

A technique for processing a bearing ring by steel tube hot-rolling and precise cold-rolling has the advantages that the processing flow is short, the use is convenient, the operation is fast, labor, time and materials are saved, the utilization rate of processing materials is up to more than 95, a lot of time and energy is saved, the product quality is improved remarkably, the working efficiency is increased by more than 200%, and the labor intensity is reduced. The technique comprises the following processing steps in sequence: first, conducting the steel tube hot-rolling procedure to process and form a hot-rolled steel tube; then conducting the bearing ring cold-rolling forming procedure to make the hot-rolled steel tube used for processing the bearing ring into a bearing ring blank which is uniform in size and meets the processing standard of the bearing ring, wherein both the inner diameter and the outer diameter of the bearing ring blank are 20-35% smaller than that of a finished bearing ring to be processed; placing the bearing ring blank in a precise cold-rolling forming machine, powering the bearing ring blank to rotate at a normal temperature, enlarging and deforming the bearing ring blank in the rotating process, and conducting cold-rolling forming processing to obtain the finished bearing ring in a target size.

The invention relates to an IEC61850 abstract service to 61968 message mechanism mapping method. The method comprises a first step of defining a message subject of IEC61850 functional communication and implementing the correspondence of an IEC61850 abstract service to the IEC61968 message subject; a second step of filling a message carrier of the IEC61850 functional communication, and effectively encapsulating business data of the IEC61850 function into the IEC61968 message carrier; and a third step of transmitting the encapsulated IEC61850 business data by way of Web Services communication. According to the invention, equipment and a bus are seamlessly connected and the information sharing between application systems is improved; the further application of the modeling idea is ensured and the interoperability among the equipment is improved; and the IEC61850 standard application is extended and is no longer merely limited to substation automation.

The invention discloses a multi-evaporator loop heat pipe. The structure comprises a condenser, gas-liquid pipelines and four evaporator compensator units, the design method that four evaporators share one condenser is adopted, and the evaporators are gas-coupled. The condenser comprises a steam cavity, a converging hole cover plate and a condensing distributing plate; by the aid of the structurallayered design of the condenser, the evaporators are symmetrically distributed in the circumferential direction of the condenser, the design of pipelines are matched with the condenser, superheated steam is coupled in the steam cavity at the upper layer of the condenser, enters the lower-layer condensing distributing plate via converging holes for condensing heat exchange and flows out evenly along dispersing flow channels. Evaporator compensators adopt the integrated design of cylindrical structures. By the aid of the loop heat pipe, the design of an efficient heat transfer component under the condition that the single cold source faces multiple dispersed heat source is realized, and the heat uniformity among the evaporators is improved with the design method of gas coupling and uniformdistribution.

The invention discloses a circuit of amplifying a signal in a transformer anti-theft monitoring system. The circuit of amplifying the signal in the transformer anti-theft monitoring system comprises an infrared sensor (J1), a first capacitor (C1), a first audion (Q1), a second capacitor (C2), a first operational amplifier (A1) and an amplifying signal output circuit (3). Two ends of the first capacitor (C1) are connected with the infrared sensor (J1) and the base electrode of the first audion (Q1) respectively; the emitting electrode of the first audion (Q1) is grounded; two ends of the second capacitor (C2) are connected with the collector electrode of the first audion (Q1) and the in-phase input end of the first operational amplifier (A1) respectively; the amplifying signal output circuit (3) is connected with the output end of the first operational amplifier (A1). When being applied to a transformer anti-theft system, the circuit of amplifying the signal in the transformer anti-theft monitoring system can amplify a signal collected by the infrared sensor (J1), and therefore the monitoring system in the transformer anti-theft system can make right judgment, and accordingly normal application of the transformer anti-theft system can be guaranteed and anti-theft performance is strengthened.

The invention provides a rotary shaft of a rotary workpiece with voltage and temperature measuring signal being conducted in a co-shaft mode and an installation method. The rotary shaft of the rotaryworkpiece with voltage and temperature measuring signal being conducted in the co-shaft mode comprises a hollow shaft, an insulating sleeve, a thermocouple conducting wire, a connector, an insulatingflange A, an outer connector, a thermocouple, a workpiece desk end connector, an insulating flange B, a chamber penetration mechanism, a thermocouple upper end connecter, a driving wheel and an electric brush sliding ring; the insulation sleeve is arranged in the hollow shaft, the thermocouple conducting wire penetrates through the insulation sleeve, the thermocouple upper end connecter is connected to one end of the thermocouple conducting wire, and the connector is connected to the other end of the thermocouple conducting wire; the thermocouple upper end connecter is connected with the workpiece desk end connector, the workpiece desk end connector is connected with the thermocouple through a conducting wire, and the connector is connected with the outer connector through the flange A; and the hollow shaft penetrates through the insulating flange B, the chamber penetration mechanism, the driving wheel and the electric brush sliding ring. The rotary shaft is capable of realizing the co-shaft conduction of the voltage and the temperature measuring signal, and meanwhile, the problems of the mutual interruption between bias voltage and temperature measurement and the vulnerability ofdividedly transmitted thermocouples are solved.

The invention provides a control method of an intelligent refrigerator, and is applied to a control terminal connected with the intelligent refrigerator. After the control terminal receives an uploading instruction, a logo of the intelligent refrigerator and information of foods stored by the intelligent refrigerator are obtained; multiple food storage areas are arranged in the intelligent refrigerator; the foods can be stored in all of the food storage areas; the food information includes information of the foods in all the food storage areas; and after the control terminal obtains the logo of the intelligent refrigerator and the food information, the logo of the intelligent refrigerator and the food information are sent to a central server for storage. Visibly, the device is applied to the control terminal; the control terminal is connected with the intelligent refrigerator provided with multiple food storage areas; and the information of the foods in all the food storage areas is stored in the central server for bringing convenience for users to log in the central server for inquiry. In addition, the invention further provides a control method of the intelligent refrigerator applied to the central server, a control device of the intelligent refrigerator applied to the control terminal and a control device of the intelligent refrigerator applied to the central server.

The invention discloses an axial ultrasonic transducer. The axial ultrasonic transducer comprises an adjusting screw 1, a pressurizing body 2, a sealing sliding column 3, an encapsulating oil 4, a center rod 5, an upper cover plate 6, an axial piezoelectric ceramic ring 7, an insulating sleeve 8, a copper electrode plate 9, a lower cover plate 10, a joint ring flange 11 and a vibration isolation ring 12; the pressurizing body and the joint ring flange are fixedly connected together through bolts; an inner cavity structure used for containing the encapsulating oil is formed in the pressurizingbody, and a thin-wall structure is adopted at the bottom of the inner cavity structure of the pressurizing body; the adjusting screw, the sealing sliding column, the pressurizing body and the encapsulating oil provide pre-tightening force required by the axial piezoelectric ceramic ring; the vibration isolation ring is inlaid at the upper end of the upper cover plate; the upper cover plate, the copper electrode plate, the axial piezoelectric ceramic ring and the lower cover plate are assembled together through the center rod; and the copper electrode plate is connected with an ultrasonic powersupply, and the axial ultrasonic-frequency electric energy is converted into axial supersonic-frequency mechanical energy during operation. When different copper electrode plates are connected with the ultrasonic power supply, axial ultrasonic waves with different frequency bands and different energy conversion efficiencies can be obtained.

The invention discloses a special low-temperature protection device for a camera. The device comprises a camera, one end of the fixture block is crimped with the camera; the other end of the clampingblock is fixed on the inner side of the annular cylindrical inner shell; the outer side surface of the annular cylindrical inner shell sleeves the inner side surface of the annular cylindrical phase change layer; the outer side surface of the annular cylindrical phase change layer sleeves the annular cylindrical heat preservation layer; an annular clamping block with a rectangular cross section isfixed to the side face, away from the camera, of the heat preservation layer. Four quadrangular clamping grooves are uniformly formed in the annular cylindrical inner shell along the inner side surface; a quadrangular frustum pyramid clamping groove is formed in the side surface of each quadrangular prism clamping groove; an annular clamping piece is fixed to the end, away from the camera, of each quadrangular frustum pyramid clamping groove, one side face of the cylindrical glass is in press connection with one annular clamping piece, the other side face of the cylindrical glass is in pressconnection with the annular clamping block, and an electric fan, an electric heating device, an air inlet guide device, an air port guide device and a fan impeller are sequentially fixed to the innerside face of the annular cylindrical inner shell. The defects in the prior art can be overcome, and normal application of the camera in a low-temperature environment is guaranteed.

The invention discloses an anchoring and retaining structure for reducing support height of existing overhigh retaining wall. A counterforted retaining wall (1) adhered to the root portion of an overhigh gravity retaining wall (5) is arranged at the root portion, one end of the bottom of the counterforted retaining wall (1) close to the overhigh gravity retaining wall (5) is connected with a prestressed anchor rod (2) applying inclined downward pressure to the counterforted retaining wall (1) towards one side of the overhigh gravity retaining wall (5), and one end of the bottom of the counterforted retaining wall (1)away from the overhigh gravity retaining wall (5) is connected with a reinforced concrete pile (3) applying upward support force to the counterforted retaining wall (1) through a hinge (4). The anchoring and retaining structure for reducing the support height of the existing overhigh retaining wall is small occupied area and used for reducing the support height of the existing overhigh retaining wall.

The invention provides a mobile wireless ad hoc network coverage connection method, which comprises the following steps of: firstly, establishing a coverage connection model of a mobile wireless ad hoc network, and designing a new network connectivity method; then, providing an improved self-adaptive ion motion algorithm, and designing a liquid ion updating method based on homologous collaborative optimal guidance and a solid ion updating method based on ranking classification evolution; and finally, optimizing the coverage communication model by using a proposed ion motion algorithm. According to the method, the network coverage rate and connectivity can be optimized at the same time, and the overall performance of the mobile wireless autonomous network is effectively improved.

The invention discloses an elastic expansion spine growth rod system. The system comprises an orthopedic rod, a clip, a spring and a spring sleeve; the orthopedic rod is a round rod, the clip comprises a snap ring and a locking screw, the snap ring sleeves the orthopedic rod, the snap ring is provided with a screw hole, and the locking screw runs through the screw hole to be in locked connection with the orthopedic rod; the spring sleeves the orthopedic rod between the end of the orthopedic rod and the clip, and the spring is sleeved with the spring sleeve; the spring sleeve is a square tube.The elastic expansion spine growth rod system can not only prevent scoliosis from being aggravated, but also can continuously exert an expansion effect along with the growth of the spine of a child patient, the structure is simple, the use is convenient, the manufacturing cost is low, the operation frequency is greatly reduced, the bending expansion force is larger, and the corrective effect on patients with large curvature of the scoliosis is better.