47results about How to "The principle is simple and clear" patented technology

The present invention is one kind of pile hole calipers. Each of several pieces of upper test strips is hinged to the lower end of the test tube at its one end and hinged to one end of one corresponding lower test strip, and the outer ends of the lower test strips and hinged to form an umbrella shaped structure. The test rope is passed through the test tube and connected to the movable hinging point of the lower test strips. Some positioning rod is mounted to the upper end of the test tube. After the test tube is descended to the measured depth, test rope is pulled to drive upwards the lower ends of the lower test strips so that the hinged point between the upper and the lower test strips moves horizontally and the test strips expand to contact the hole wall.

The invention relates to a novel material testing machine, which consists of four parts, namely, a control system, a detection system, a tension, compression and torsion system and a bending system. In the control system, an industrial personal computer controls a motion control card through a software system, so that the motion control card drives a stepper motor to rotate by a shaft coupling and then drive a first worm, a second worm and a lifting platform to move to realize motion control. The detection system consists of an STSS-1 stress-strain module and a loading sensor. The tension, compression and torsion system consists of a shaft, a movable base and a pair of round four-jaw chucks, wherein the two ends of the shaft are provided with threads of which screwing directions are opposite; the movable base is in threaded connection with the shaft; and the pair of round four-jaw chucks is fixed on the movable base. The bending system is used for clamping the lifting platform which can move up and down on the upper surface of the middle part of a fixed base; and a loading head is arranged on the lifting platform. The novel material testing machine realizes tests in the two-way stretch, compression and torsion of work pieces, and can realize various combined two-way or one-way tests.

The invention discloses a system for preventing unauthorized use of an IC card. The system comprises an IC card reader-writer, a microprocessor, a testing UID card, a power supply module, a display module, and an automatic alarming device. The device is capable of preventing the unauthorized use of the IC card mainly by determining whether the data writing-in state of the 0 block data of the 0 sector of the IC card, the number of the IC card, and information stored in the IC card are consistent with related information of a system database. The UID card is tested to determined whether the working of the system is normal. When the working of the system is normal, user IC card operation is carried out. When the IC card is not the original card, the system is capable of forbidding the writing and reading operation of the card, and is used to transmit IC card leakage prompting information to a cell phone of a user and a public security organ by short messages. The principle and the operation of the device for preventing the unauthorized use of the IC card are simple and clear, and therefore whether the IC card information is leaked can be determined accurately, and the safety and the confidentiality of the IC card are greatly improved.

The invention relates to a novel flight and an aircraft, belonging to the field of aviation. A new fight method which fully utilizes high-speed airflows comprises the following steps: all the high-speed airflows which are artificially generated simultaneously flow through wings and the upper surface of an aircraft body below the wings and then flow to a rear area. Thus, the high-speed airflows pass through the wings and the upper surface of the aircraft body in a motion course to supply a lift force and a thrust force to an aircraft; and because the wings are all in the high-speed airflows, the aircraft can accurately control a flight attitude in any flight state, and the lift force of the aircraft can be independent of the motion state of the aircraft. Even if an airplane is motionless, the same lift force can be obtained. The aircraft maintains a small angle of attack and the combined force of the thrust force and lift force of the aircraft is perpendicular to the ground, thus the aircraft can perpendicularly take off, hover in the air or perpendicularly land. Furthermore, downwash airflows do not exist corresponding to the lower part of the aircraft; and the aircraft has the common advantages of the high-speed flight of a fixed wing airplane and the perpendicular take-off and landing of a helicopter, and eliminates the defects of the fixed wing airplane and the helicopter.

The invention relates to a transverse deformation measuring system based on laser irradiation intensity variation, which comprises a laser device, an optical filter, a focusing lens, a photoelectric detector and an oscilloscope which are sequentially placed, wherein geometrical centers of the laser device, the focusing lens and the photoelectric detector are kept on an axis, main planes thereof are parallel to one another, and the photoelectric detector is electrically connected with the oscilloscope; the laser device is used for emitting laser, and irradiating the laser on a test piece to be measured arranged between the laser device and the focusing lens as well as on the optical filter behind the test piece to be measured; the photoelectric detector is used for receiving focused laser irradiation and sensing a light intensity signal, and acquiring an electric signal corresponding to the light intensity signal through photovoltaic conversion; and the oscilloscope is used for calculating and displaying the electric signal. The transverse deformation measuring system achieves measurement of material transverse deformation. A measuring device does not need to be adhered to an object to be measured in laser deformation measurement. The transverse deformation measuring system and a transverse deformation measuring method provided by the invention have high measurement precision and can capture any slight transverse deformation produced by the test piece.

The invention relates to a solenoidal magnetic field measurement system and a using method thereof, and the solenoidal magnetic field measurement system is characterized by comprising an adjustable reference platform, an adjustable coil supporting plate, a three-dimensional translation platform, a measurement arm, an electric rotating platform, a measurement probe, a laser tracker and a controller; an adjustable coil supporting plate is arranged below the adjustable reference platform; mounting reference pieces are symmetrically arranged at the top and the bottom of the adjustable reference platform; the three-dimensional translation platform is arranged on one side of the adjustable reference platform, the top of the three-dimensional translation platform is slidably connected with one end of the measurement arm, the other end of the measurement arm is slidably connected with the electric rotating platform, the electric rotating platform is fixedly connected with the measurement probethrough a measuring rod, and the measurement probe is used for measuring an axial magnetic field and a radial magnetic field; the adjustable reference platform and the measuring rod are respectivelyprovided with a target seat, and the laser tracker is used for tracking the position of a target ball on the target seat; and the controller is connected with the three-dimensional translation platform, the electric rotating platform and the measurement probe. The system can be widely applied to the field of accelerator magnetic field measurement.

The invention relates to a tray (well) diameter detector, in particular to an aperture measuring device which is quite suitable for detecting pore-forming and tray-forming quality of a branch pile, has simple and clear principle, economical efficiency, practicability, obvious superiority in practicability and easy popularization and application, can provide technical parameters of well wall incline, well diameter, tray diameter and the like and effective technical support for the construction quality of the branch pile, and has favorable economical benefits and social benefits. The tray (well) diameter detector comprises an apparatus outer seat, an arm-drawing hydraulic cylinder, an inclining angle sensor, a diameter measuring arm, a pull rod, a diameter measuring tension spring, an apparatus lifting rope, an information output line and an oil supply pipe, wherein the diameter measuring arm is in close contact with a pore wall through the diameter measuring tension spring and the pull rod; the inclining angle connected on the diameter measuring reflects the changes of the diameter of the pore wall through the changes of an inclining angle; and the oil supply pipe supplies oil for the arm-drawing hydraulic cylinder so as to draw back the diameter measuring arm to be matched with the rotary angle of the detector, thus realizing carrying out up and down repeated measurement on the cavity of the tray from multi angles and detecting the tray diameter and shape of the branch pile.

The invention discloses a gum dipping fiber mechanical property testing method which comprises the steps that 1. preparing of a gum dipping fiber bundle and a stretching sample is carried out; 2. the section area of the gum dipping fiber bundle to be tested is computed; 3. the maximum load Pmax and the ductility delta of the gum dipping fiber bundle to be tested are measured; and 4. the tensile strength sigma of the gum dipping fibers is computed. A clamping piece of the gum dipping fiber stretching sample is in a rhombus shape, the gum dipping fiber bundle penetrates through the diagonal of the clamping piece, so that centering during clamping is easy, and the clamping piece has the advantages of being convenient to machine, low in cost, capable of being used repeatedly and the like. The gum dipping fiber mechanical property testing method is simple and clear in principle and easy to operate, tested data are accurate and reliable, and the performance situation of materials can be reflected really.

The invention relates to a method for detecting shallow wind below 200 meters, which is characterized in that a hydrogen balloon tied by a light rope with specified length is taken according to the height of target shallow wind, the tail end of the light rope is fixed on the ground, and an elevation angle and an azimuth angle of the hydrogen balloon are observed by adopting a theodolite at a fixed point of the light rope on the ground, wherein the wind direction at the same height as the hydrogen balloon is calculated by using the azimuth angle, and the wind speed at the same height as the hydrogen balloon is calculated by using the elevation angle. According to the invention, the hydrogen balloon is enabled to stay at a shallow wind layer below 200 meters by using the light rope, then detection is performed on the shallow wind layer, a pulling force imposed on the hydrogen balloon by the light rope is considered, a composite force of a static lifting force received by the hydrogen balloon and the wind pressure is balanced with the pulling force imposed on the hydrogen balloon by the light rope, the wind direction and the wind speed are calculated by using a wind pressure principle, and high observation accuracy can be reached.

The invention discloses a centrifugal test model for verifying combined action of a supporting structure and a soil body and a manufacturing method of the centrifugal test model and belongs to the field of geotechnical engineering test. The centrifugal test model structurally comprises a model box; a supporting plate for simulating a supporting wall is vertically embedded into the model box; a bending moment strain gauge is arranged on the supporting plate to detect the bending moment strain value of the supporting plate; the supporting plate divides the inside of the model box into a foundation soil layer zone and an excavation zone, the foundation soil layer zone is filled with foundation soil, the lower part of the excavation zone is the foundation soil, and an excavating bucket soil bag for simulating the earthwork of an excavating bucket is arranged at the upper part of the excavation zone; a soil pressure sensor is arranged in the foundation soil to detect the pressure value of the foundation soil; displacement meters are respectively arranged on the surface of the foundation soil and the supporting plate. The centrifugal test model disclosed by the invention is suitable for a centrifugal model test for verifying the scientificity of combined action of the supporting structure and the soil body, simple and definite in principle, low in manufacturing cost and consistent with actual construction conditions and conforms to the actual stress change of the soil body.

The invention provides a UPQC series side reactive compensation control method based on a rotating vector method. The method includes the following steps that whether reactive compensation needs to be started for a UPQC series side or not is judged; the voltage amplitude and the phase which need to be output in the UPQC series side reactive compensation process are calculated; the modulating voltage output by an inverter on the UPQC series side is calculated. By the adoption of the UPQC series side reactive compensation control method based on the rotating vector method, when no compensation for the system voltage sag exists in the UPQC series side, a parallel side and the series side jointly conduct compensation on load reactive power, the whole operating range in the UPQC reactive compensation process is widened, and the method has the advantages that control objectives are definite, the response speed is high, and the control effect is good. The method can be applied to increasing UPQC reactive compensation capacity through capacity compensation reactive power in the idle process of the UPQC series side and compensating for the reactive power through idle capacity of other series FACTS devices, and the economical efficiency of power electronic equipment is comprehensively improved.

The invention provides a method for measuring the gravitational acceleration by utilizing increase of the radius of a pendulum bob. According to the method, a calculation formula of the gravitational acceleration g is obtained by analyzing the swinging period of a compound pendulum system consisting of a swinging rod and cylindrical weights, researching the change of the swinging period of the compound pendulum system when the radiuses of the cylindrical weights with the radiuses of r2 and r1 are gradually increased by step lengths of r2 and r1 and comparing the influences on the swinging period caused by different step lengths. Compared with the current experimental methods widely adopted, the method provided by the invention has the advantages that from the experimental principle, the equivalent pendulum length can be obtained without depending on changing the position of the compound pendulum system from a mass center to a suspension point, and the value of the gravitational acceleration obtained by the slope of a fitting line is realized by analyzing the influence of the step lengths in radius change of the pendulum bob on the swinging period, so that the complex and tedious data processing work is reduced, the data processing speed is increased, the data processing error is reduced; and the method adopts a simple and definite principle and is convenient to understand and is suitable for being operated by students.

The embodiment of the invention provides an active electronic current transformer and a power supply method. The active electronic current transformer comprises a high-voltage side coil power-taking power supply and a low-voltage side laser power supply, a high-voltage side signal collector and a laser power supply control unit, wherein the high-voltage side coil power-taking power supply and thelow-voltage side laser power supply are used for supplying power to the high-voltage side signal collector; the high-voltage side signal collector is used for detecting current flowing through the current transformer and power supply voltage of the low-voltage side laser power supply and feeding back the detection result to the laser power supply control unit; and the laser power supply control unit is used for controlling the low-voltage side laser power supply to be in a continuous power supply state or a standby heartbeat state according to the fed back current flowing through the current transformer and adjusting the output power of a laser according to the power supply voltage, which is fed back by the high-voltage side collector, of the low-voltage side laser power supply. In the scheme of the embodiment of the invention, the laser power supply control unit is set to control the output power and working state of the low-voltage side laser power supply, thereby achieving dual power supplies, and improving the reliability of the power supply of the current transformer. In addition, the active electronic current transformer has the advantages of simple and clear principle and ability of prolonging the service life of the laser.

The invention provides a method for obtaining theoretical strain in strength finite element analysis. The method is characterized by comprising the following steps: (1) according to a finite element principle and a strain sensor measurement principle, establishing an additional bar element according to any given position and direction in the finite element model of a test specimen; (2) in order to prevent the additional bar element from affecting local structural stress and strain distribution characteristics, requiring to define that bar element stiffness characteristics are infinitesimal relative to the local structural stiffness characteristics; and (3) after analysis and solution are carried out, directly reading bar element strain in a result, wherein the strain is theoretical strain under any given position and direction.

The invention discloses a detection-type tester grounding wire. The grounding wire comprises a grounding wire body, a detection wire, a wiring terminal, a detection module and a grounding wire clamp;the grounding wire body is connected between the wiring terminal and one clamping plate of the grounding wire clamp, and the detection wire is connected between the wiring terminal and the other clamping plate of the grounding wire clamp. The grounding wire has a grounding wire self-detection function, and whether the grounding wire is in a good state or not can be more directly shown. The grounding wire has the function of detecting whether grounding is good or not, and personnel electric injury or instrument burnout caused by poor grounding is avoided. The grounding wire is simple and clearin principle, the grounding wire clamp is used for clamping the 'ground' to form an on-state loop, and whether the grounding wire is well grounded or not can be detected at any time by pressing a small switch. A buzzer can buzz and emit light if the grounding wire is well grounded, the buzzer cannot buzz or emit light if the grounding wire is not well grounded or is not grounded, and the groundingwire has a high identifying degree and can be used in different working environments.

The invention discloses a device and a method for avoiding mistakenly unlocking a lock of Mobike due to wrong input of codes. The device comprises a local user mobile phone connected with a cloud server, wherein the cloud server is connected with the local user mobile phone and an intelligent Bluetooth bike lock, the intelligent Bluetooth bike lock is connected with the cloud server and a nonlocal user mobile phone, Bluetooth of the user mobile phone firstly makes a pair with Bluetooth of the bike, the user mobile phone can send code information to the cloud server after a user inputs the codes of the bike, and the cloud server can find the bike with the corresponding codes, drives a GSM module in the intelligent Bluetooth bike lock to send a command about whether to confirm unlocking of the bike lock to the user mobile phone and determines whether the user receives the message about confirming unlocking of the bike lock after three minutes of delay and determines whether the user confirms unlocking of the bike lock if the message is received. The situation that the user is faced with penalty due to bike loss caused by wrong input of the codes of the bike can be accurately prevented, and legal use rights of the user and the safety of the Mobike are guaranteed.

The invention discloses a sound wave propagation principle-based method for detecting the grouting effect of the pile bottom of a bottom-enlarged grouting pile. For the bottom-enlarged grouting pile, after grouting is completed, a plurality of acoustic testing pipes are uniformly arranged around a pile body at proper distances and the pipes need to be longer than the pile; by taking clear water as a coupling agent, an acoustic wave transducer and an acoustic wave receiver are put into two acoustic testing pipes separately and sink to the bottoms of the pipes; proper acoustic wave parameters are selected, and the same elevation or a fixed elevation difference is kept; the acoustic wave transducer and the acoustic wave receiver are lifted upwards at a proper constant rate to obtain a time travel curve of the acoustic wave; and the grouting effect of the enlarged head of the pile end is analyzed from the time travel curve.

The invention discloses a network physical isolation switchboard wherein the control processor port of the network switchboard is connected to a switch module, the inner server port and the outer server port are connected to the physically isolated logic NOT switch module ports, the client machine is connected to the switchboard network port, the control processor control logic is connected to the switch module control end via. a switch logic module, the switch logic module is arranged to switch the module actions according to processing of the processor. Further, the control processor port of the switchboard is also connected to a universal I / O port and the distributed logical module, wherein the universal I / O port provides standard input / output ports for the allocated static control information of the switchboard, the distributed logic module is used to store the switchboard static control information, the switching control processor switches the port operating status, amends routing information and switching logic according the control logic.

The invention provides a device for cleaning the inner walls of pipelines with multiple inner diameters. The device comprises a motion control unit and a laser transmission scanning unit. The motion control unit comprises a movable main unit platform, a vertical fixed support rod, a horizontal support rod, a first servo motor and a first ball screw. The laser transmission scanning unit comprises an optical fiber laser, a transmission optical fiber, a laser head, a support, a concave lens, a convex lens, a second servo motor, a second ball screw, a lead screw slider, a lens bracket, a reflector, a reflector bracket, a scanning galvanometer, a cone reflector, a quartz cover, a support plate and an adjustable knob. According to the device, a novel pipeline inner surface laser cleaning technology based on a front focusing galvanometer system is adopted, a laser focal plane is converted into an annular surface along the inner side of a pipeline in combination with the cone reflector, three-dimensional curved surface machining is ingeniously decomposed into two-dimensional scanning, the whole machining process is simplified, and the bottleneck problem that it is difficult to apply a traditional laser cleaning technology to pipeline inner surface cleaning is solved.

The invention discloses a system and method for performing subcarrier decoding on high-frequency signals with subcarrier modulation. The system comprises a power regulating circuit, a frequency divider circuit, a digital phase-locked loop circuit, a digital decoding circuit and a display terminal, the power regulating circuit is used for performing power amplification or attenuation on the high-frequency signals so as to control signal amplitudes within a power range necessary for the frequency divider circuit; the frequency divider circuit is used for reducing the frequency of the high-frequency signals to 20MHz or so medium frequency signals with subcarrier frequency information; the digital phase-locked loop circuit is used for presetting the output frequency of a local vibration source and performing orthogonal down-conversion, extracting and filtering, phase discrimination and loop filtering on the medium frequency signals subjected to frequency division and preset signals of the local vibration source to form a phase-lock loop with a controllable oscillator; and the digital decoding circuit is used for extracting error AC signals output by a loop phase discriminator in a loop locking state and performing coherence filtering with one or more known subcarrier signals so as to detect the subcarrier frequency time sequence information carried in the high-frequency signals in real time and display the subcarrier frequency time sequence information through the display terminal.

The invention provides a hollow pendulum barrel experiment device which processes data accurately and conveniently, is suitable for operation by students and is used for measuring gravity acceleration. The hollow pendulum barrel experiment device is composed of a hollow pendulum barrel and two sets of cylindrical weights with the same height and different radiuses. A compound pendulum system is formed by the hollow pendulum barrel and the cylindrical weights, first a swing period of the compound pendulum system is obtained after different amounts of weights are added, and a gravity acceleration computation formula is obtained by analyzing influences of the two sets of weights. Compared with an existing method, the gravity acceleration is obtained by fitting a slope of a straight line, thehollow pendulum barrel experiment device has the advantages of being simple in experimental method and convenient in data processing, the complex experimental data processing process is avoided, experimental data precision is improved, the experiment device is convenient to operate, a principle is easy to understand, and the experiment device is suitable for physics experiment teaching.

The invention discloses a method for measuring the height of a total station. The method applies a light reflection principle. After the total station is centered and leveled on a measuring basic point, a vertical tower ruler is erected a certain distance away from the measuring basic point, and one reflective body is arranged on the tower ruler. According to the invention, an image formed by the basic point in the reflective body can be observed from the ocular lens of the total station through vertical movement of the reflective body along the tower body, and the distance from the horizontal axis of the total station to the basic point, i.e., the instrument height, can be solved according to the equal relation between an optical incidence angle and a reflection angle and the included angle relation between parallel lines. The method provided by the invention is simple and clear in principle, simple and cheap in materials, simple to operate, high in precision, easy to grasp and facilitates engineering application.

The invention relates to a deformation measurement device, which comprises a laser, an optical filter, an object mounting frame, a focusing lens, a photodetector and an oscilloscope arranged in sequence, and the geometric centers of the laser, the focusing lens and the photodetector are kept on a straight line On the axis, and the main planes are all parallel to each other, the photodetector is electrically connected to the oscilloscope; the laser, object mounting frame, optical filter, focusing lens and photodetector are all installed on the slide rail of the workbench; A mounting buckle is arranged on the object mounting frame. The invention realizes the measurement of the lateral deformation of the material. When measuring the deformation of the object, it is not necessary to paste the measuring device on the object to be measured, only by laser irradiation and oscilloscope measurement. The invention has high measurement accuracy and can capture any small lateral deformation produced by the test piece.

A device and method for identifying an IC card, the device includes an IC card reader, a microprocessor, a test UID card, a card issued by a bank, a power supply module, a display module, an automatic alarm device, etc., and first obtains the user IC card 0 sector 0 The data readout time of the block data and other sector data is compared with the data readout time of the IC card issued by the bank to determine whether it is within a certain range, so as to determine whether the IC card is a normal card, and realize the anti-theft of the IC card Function; first test the UID card to judge whether the system is working normally, if it is normal, the user can operate the IC card, when the IC card is identified as an abnormal card, the system prohibits the card from reading and writing, and sends a message to the user Mobile phones and public security organs send IC card leakage prompt information; the device for identifying IC cards provided in the present invention is simple and clear in principle and operation, can accurately judge whether the information of the IC card is leaked, and greatly improves the safety and security of the IC card. confidentiality.

The invention discloses a calculation method for road speed limit value evaluation. The calculation method is particularly suitable for speed limit value evaluation of expressways, highways and urban roads. The system comprises a linear index influence module, a roadside interference module, a vehicle speed limiting module, a vehicle performance module, a driver behavior module and an integrated calculation module. According to the calculation method, factors such as road alignment indexes, roadside interference factors, speed limiting factors, vehicle performance and driver behaviors are combined, a mathematical calculation method among people, environment and vehicle speed is established, the condition of driving speed change of a driver on a road can be simulated only by inputting calculation parameters into a computer, and a running speed result of the road can be obtained. According to the calculation method, a theoretical basis is provided for evaluation of the existing road speed limit value, the calculation method is simple and clear in principle, scientific and efficient, the road speed limit value can be effectively adjusted and optimized, the urban traffic operation efficiency is improved, and the efficiency and accuracy of road speed limit value evaluation work are improved.

The invention provides a pipeline inner wall laser cleaning device based on side wall projection. The pipeline inner wall laser cleaning device comprises a motion control unit and a laser transmission scanning unit. The motion control unit comprises a movable main unit platform, an automatic rotating shaft, a horizontal moving platform, a height adjusting unit, an electric horizontal supporting rod, a first servo motor, a first ball screw and a rotatable laser range finder. The laser transmission scanning unit comprises an optical fiber laser, a transmission optical fiber, a laser head, a support, a concave lens, a convex lens, a second servo motor, a second ball screw, a screw slider, a lens bracket, a reflector, a reflector bracket, a scanning galvanometer and a field lens. After being emitted, a laser beam propagating in the axial direction of a pipeline passes through the concave lens, the convex lens and the reflector and then enters the scanning galvanometer, and through the scanning galvanometer, the laser passes through the field lens and then is focused on dirt on the inner wall of the pipeline. According to the pipeline inner wall laser cleaning device, a machining head or the pipeline does not need to spin in the whole machining process, and the bottleneck problem that a traditional laser cleaning technology is difficult to apply to cleaning of the inner surface of the pipeline is solved.

The invention relates to a power device which utilizes gravity, buoyancy and elasticity to do work. The power device comprises a buoyancy rod, a buoyancy rod floating-up channel and a device bin, wherein the device bin comprises a rotary wheel, a buoyancy rod dropping channel, a block and partition bag, a material inlet, a buoyancy rod force receiving plug and an elastic hoop. The buoyancy rod force receiving plug thrusts aside after the buoyancy rod drops to drive the rotary wheel to do work, the buoyancy rod enters liquid, then the vertical state of the buoyancy rod is changed into the horizontal state after the buoyancy rod enters the liquid for a certain of immersion depth, and the buoyancy rod floats out of the liquid and then goes back to the dropping point. The conditions for completing the series of motions are that the closing force of the block and partition bag must be equal to or larger than the pressure of a liquid column with the same size as the projective plane of the buoyancy rod dropping channel to enable the liquid to be separated from the device bin (land); the length of the buoyancy rod must be larger than the diameter of the buoyancy rod dropping channel. The impact force generated by the buoyancy rod can overcome the closing force of the block and partition bag, and the vertical state of the buoyancy rod is ensured to be changed into the horizontal state after the buoyancy rod enters the liquid for a certain of immersion depth.

The invention discloses a leveling instrument fast leveler. The leveler comprises a semicircular shell and a hemispheroid, the hemispheroid is inscribed to the semicircular shell inner diameter, and the semicircular shell and the hemispheroid are both made of a metal material, and the semicircular shell inner surface and the hemispheroid spherical surface are both frosted surface. A magnetic switch is disposed on the semicircular shell and can provide strong magnetic force when it is opened, the hemispheroid is equipped with an instrument connecting screw rod connected to the leveling instrument, and the semicircular shell is equipped with a foot stand connecting nut for connecting a foot stand. During use, the semicircular shell is fixed on the foot stand, the hemispheroid is connected to the leveling instrument, the hemispheroid is rotated to achieve a horizontal position, and then the magnetic switch is opened to generate strong magnetic force so as to fix the hemispheroid and the semicircular shell, so that the leveling instrument can maintain a horizontal state fixedly. The leveling instrument fast leveler provided by the invention has the characteristics of simple and clear principle, simple and cheap material, simple operation, fast leveling speed and easy grasp, and is convenient for engineering application.

The invention discloses a method for improving current differential protection motion performance of a series compensated line. The method comprises the steps that S1, after the series compensated line goes wrong and current differential protection is started, a first fault current and a second fault current on two sides of a fault point of the series compensated line are collected; whether the first fault current and the second fault current meet a protection criterion is judged, and if yes, current differential protection motions are conducted, and a circuit breaker trips; if not, the current differential protection motions are not conducted. According to the method, By the adoption of the protection criterion, when a system operates normally and alternatively external faults occur, the amplitudes of the currents on the two sides of the line are close to each other, the motion increment of the portion is close to zero, and the false action risk cannot be increased; when internal faults occur, because faults of current reversal of the series compensated line are all faults of fault points close to a series compensated installation position, the difference between the amplitudes of fault currents on the two sides is large, so that the motion increment of the portion can effectively increase the motion quantity, protection motion sensitivity is improved, the motion rejection risk is lowered effectively, and protection reliability is improved substantially.

The present invention discloses a method for measuring the height of a theodolite. According to the method, the light reflection principle is used, a vertical stadia rod is established a certain position away from a measuring base point after the theodolite is subjected to centering leveling on the measuring base point, a light reflection body is placed on the stadia rod, the base point image formed in the light reflection body can be observed from the theodolite eye lens through the movement of the light reflection body up and down along the stadia rod, and the distance between the theodolite horizontal axis to the base point can be calculated through the light incident angle and the reflection angle equal relationship and the included angle relationship between the light incident angle and the parallel line, wherein the distance is the height of the theodolite. The method of the present invention has advantages of simple and clear principle clear, simple and cheap material, simple operation, high precision, easy grasping, and easy engineering use.