7835 results about "Safety coefficient" patented technology

The invention provides a vehicle autonomous parking path programming method used for multiple parking scenes. The method is used for automatically parking a vehicle in a parking space through an autonomous parking system when the autonomous parking system detects the available parking space. The method includes the steps that target parking space information is detected, and a parking scene is determined; the initial state and target state of the to-be-parked vehicle are determined; a vehicle kinematics differential equation is established; state variables and control variables of the vehicle are segmented, equidistance sampling is performed on each segment according to certain time step, and to-be-optimized variables are obtained; an equality constraint, boundary constraints and inequality constraints of the to-be-optimized variables are formed; motion range constraints of the to-be-parked vehicle are formed according to the motion range limit in the parking process of the vehicle; an optimization objective is determined, and an objective function is established; and by means of a nonlinear programming solver, an optimal solution of a parking path is obtained. The vehicle autonomous parking path programming method is suitable for the multiple parking scenes, the design is reasonable, abundant information can be provided so as to control autonomous parking of the vehicle, and the security coefficient is high.

The invention provides an unmanned aerial vehicle bridge bottom surface crack detection method and system. The unmanned aerial vehicle bridge bottom surface crack detection system comprises an unmanned aerial vehicle end and a ground workstation. The unmanned aerial vehicle end utilizes an airborne laser radar and an inertial measurement unit to position an unmanned aerial vehicle and form an unmanned aerial vehicle peripheral barrier point cloud to avoid barriers and plan a path; and an airborne platform camera photographs a bridge bottom surface at a constant frequency and stores a high-definition image into a memory. The ground workstation processes the photographed image, and splices an image between bridge piers to form a large-sized bridge bottom surface image; then the edge information in the image is acquired, the morphological corrosive expansion and connection are performed on the edge to extract a complete crack, and the crack is roughly positioned by virtue of a bridge pier position at which the spliced image is arranged; and finally the crack is evaluated, and information about the crack such as a length, a width, a distribution density and the like is analyzed and measured. The unmanned aerial vehicle bridge bottom surface crack detection method and system are high in automation degree, high in efficiency, high in safety coefficient, low in cost and wide in application prospect on the aspect of the bridge bottom surface route inspection.

The invention discloses a UWB-positioning-based intelligent automobile transfer robot and a control method thereof. A traveling mechanism, a lifting mechanism, a clamping mechanism, an electrical control unit, a central control unit and a charging unit are arranged on two load-bearing faces, control can be realized through an instruction of the central control unit, and the position of a clamping arm can be adjusted in advance during traveling according to an instruction sent by a parking lot main control system; an automobile can be clamped by only a slight action when reaching a parking position. Compared with existing automobile transfer equipment, the intelligent automobile transfer robot can remarkably reduce automobile transfer time, safety coefficient in the automobile transfer process can be improved, and safe, quick and intelligent parking can be realized.

The invention relates to a steel plate surface polishing device, in particular to a steel plate surface polishing device for hardware machining. The steel plate surface polishing device for hardware machining aims to achieve the technical purposes that manual labor is not needed, the requirement for professional operation skills is not high, operation is easy, the price-performance ratio is high, the safety coefficient is high, and harm of the operation environment to health of operators is small. In order to achieve the technical purposes, the steel plate surface polishing device for hardware machining comprises a bottom plate, a first sliding rail, a first sliding block, a collection tank, a fixing stop block, a spring, a supporting rod, a first bearing pedestal, a first air cylinder, a disc and the like, wherein the first sliding rail is arranged in the middle of the top of the bottom plate. Through ingenious cooperation of the components, the effects that manual labor is not needed, the requirement for professional operation skills is not high, operation is easy, the price-performance ratio is high, the safety coefficient is high, and harm of the operation environment to health of the operators is small are achieved.

The invention discloses a linear control based automobile steering system, which comprises a signal acquisition part, a control unit part and a mechanical execution part and is characterized in that the signal acquisition part acquires a steering signal and a torque signal of a steering wheel, an angle signal of a wheel, a speed signal of the whole automobile, an acceleration signal and a side angular speed, and transmits the signals to the control unit part; and the control unit part analyzes and judges the signals, and outputs a control signal to control the motion of the mechanical execution part. The automobile steering system adopts the control of double motors, wherein an upper motor realizes real simulation of road induction, and a lower motor can realize the accomplishment of steering motion. Because the mechanical connection between the steering and the execution is cancelled, the steering and the execution have a modularized product respectively, so that the system is convenient to update and assemble so as to improve the safety factor of the automobile steering system.

The invention relates to the field of community management, and provides a community personnel file intelligent management method. The method comprises the steps that faces are detected by using a deep learning model, and list database comparison is conducted; management and classification of community personnel are conducted by adopting a mechanism of black, white, and gray lists to achieve real-time alert of special personnel; cleaning of acquired image data is conducted to optimize and train the deep learning model; entry and exit time of the community personnel are analyzed to achieve advance warning of abnormal events; archive information of list database personnel is used for forming relevant statistical data and charts of the community. By means of a community management system, specification management of the community personnel and timely warning of the special personnel and the abnormal events are achieved to reduce work load of security personnel and effectively improve safety coefficient of the community, and community management is more intelligent.

The present invention discloses a soil slope stability analysis method based on limit equilibrium theory and stress analysis, wherein the method comprises the following steps: 1) respectively preinstalling two slip surface starting points on the slope base and the next-to-top position of slope; 2) preinstalling a plurality of slip surface starting points on natural interface of slope between the two slip surface starting points; 3) setting the preinstalled safety factor corresponding with each slip surface starting point, and calculating out the critical slip surface corresponding to each slip surface starting point through calculating the found preinstalled safety factor satisfying the condition; and 4) selecting the critical slip surface with least preinstalled safety factor as the critical slip surface of whole soil slope, wherein the least preinstalled safety factor is used as the stability safety factor of whole slope. The soil slope stability analysis method of the invention has the following beneficial effects: (1) no requirement for pre-supposing the shape or position of slip surface, and only requirement for supposing the starting point position of slip surface (namely the position of so-called slip surface shear crack); and (2) translation of problem for searching the critical slip surface to the problem for searching the position of critical shear crack, and overcoming the problems of leaked solution or a plurality of solutions in the traditional method.

The invention discloses a screen display data protection method and belongs to the field of computer information safety. The method includes that the triggering mechanism and the watermark information of secret-associated data and a screen data protection system are set; a user accesses the secret-associated data and trigger the screen data protection system; the screen data protection system extracts current user information, generates watermark and displays the information; a secret divulging user is searched according to the watermark information on the secret divulging document. The protection system is triggered when the user accesses the secret-associated data and generates the protection watermark with the information of the current user to display the watermark on the screen, the possibility of stealing the secret-associated data and documents through camera shooting, screenshot, picture recording and the like is effectively reduced. Once the data are disclosed, the secret divulging source can be tracked quickly according to the user information recorded by the watermark in the secret divulging document. The watermark is set to be a two-dimensional code or a bar code, the user information can be hidden, the fact that the user who steals the information avoid or remove the watermark on purpose is avoided, and the safety coefficient of the secret-associated data is further improved.

The present invention discloses remote real-time safety monitoring system for hoisting apparatus and its control method. The present invention has a remote transmission device for data transmission with the upper monitoring server, and a sensing signal acquirer for real-time acquisition of the parameter information of the hoisting apparatus. The control method is to adopt several parallel remote control threads for data processing, and includes the first setting the received data into idle data processing queue with the data monitoring and processing thread and the subsequent processing the data in the queue with the data statistics and saving thread. The monitoring system of the present invention can realize critical state alarm and emergency state control as well as understand the running state of the hoisting apparatus remotely.

The invention provides a novel relay type corridor elevator, which comprises a closed box body that is erected on a slope direction of a corridor; the closed box body is internally provided with an upper rail, a lower rail and a rail car; the rail car comprises a frame structure, an axle sliding seat, a rotating shaft, a first torsional spring and a pedal; the axle sliding seat is fixed on the frame structure of the rail car; the rotating shaft can be rotatably arranged on the axle sliding seat; a pedal shaft of the pedal is fixedly arranged on the rotating shaft; one end of the first torsional spring is fixed on the rotating shaft, and the other end of the first torsional spring is clamped on the frame structure; the rotating shaft is connected with a pedal opening and closing driving device used for driving to rotate; the pedal shaft is provided with an externally extending section; a bearing support upright rod is correspondingly arranged on the externally extending section; and the upper end of the bearing support upright rod is provided with a pedal releasing and triggering travel switch. The novel relay type corridor elevator has the advantages of high operation efficiency, greatly reduced fault rate, higher safety coefficient and good stability.

The invention discloses a gravity energy storing system relying on a massif. The gravity energy storing system comprises a high-altitude stacking platform, a low-altitude stacking platform, a plurality of standard weights, electric power increasing and generating devices and a control system. The position between the high-altitude stacking platform and the low-altitude stacking platform is paved with at least two inclined tracks, each inclined track is provided with at least one section of continuous track and each section of continuous track is provided with one set of electric power increasing and generating device. Each set of electric power increasing and generating device comprises a trailer, a cable, a cable winch and an electric generating all-in-one machine, wherein the trailer is arranged on the corresponding continuous track and connected with one end of the cable, the cable winch is installed on the edge of the platform at the end of the corresponding continuous track, and the cable winch is connected with the electric generating all-in-one machine. The control system controls the working conditions of transferring, transporting and stacking equipment and the electric power generating all-in-one machine. The gravity energy storing system is high in efficiency, low in cost, small in occupied space and high in safety coefficient.

Disclosed are a computer-implemented method for determining safety factors or a safety factor formula for use in a braking model of at least one train, a computer-implemented method for determining a plurality of safety factors for use in a braking model of at least one train, and braking systems for use on trains.

The invention mainly discloses a traveling case fingerprint lock. The traveling case fingerprint lock comprises a locking bar, wherein one end of the locking bar is provided with an inwardly-concave locking groove and is embedded in a lock shell, a tapered end matched with the locking groove is arranged in the lock shell and is matched with an engaging and disengaging gear to lock the locking bar tightly, a battery is arranged in the lock shell and is connected with the engaging and disengaging gear, and a fingerprint identifier is arranged on the lock shell and is electrically connected with a fingerprint sensor which is electrically connected with the engaging and disengaging gear; when the traveling case fingerprint lock is used, a finger is only required to be placed on the fingerprint identifier, a signal is transmitted to the engaging and disengaging gear by the fingerprint sensor, and the engaging and disengaging gear controls locking and unlocking, a user does not worry key losing, the finger is only required to be placed on the fingerprint identifier for realizing unlocking, the operation is convenient and the safety coefficient is improved.

The invention relates to the technical field for the engineering of large-section tunnel, in particular to an engineering method for the double lateral tunnel of a three-arc tunnel on soft and weak geological condition, which resolves the problem of longer duration for the exposure of wall rock, easy deformation of tunnel and poor waterproof effect in existing tunnel engineering method. The invention comprises: (1) excavation of lateral tunnel; (2) lining of later tunnel: first of all, dismantle the primary support of the whole section, then pour the arc invert secondary lining and arc section secondary lining with the construction joint being configured at the lower section of the middle wall for the lateral tunnel; (3) after the circular lining a left lateral tunnel I and a right lateral tunnel II on a same section, excavate and line a middle tunnel III. This method realizes simple equipment and convenient engineering; with the construction sequence of building the lateral tunnel and then the middle tunnel, the invention gives full play to the supporting function of the secondary lining of the middle wall, so as to reduce the load borne by the primary support of the arc section of middle tunnel and elevate the safety coefficient; the invention reduces the settlement and impact on peripheral environment, so as to ensure the stability and safety of the excavation working face; small number of construction joint and high working efficiency.

The invention discloses a temporary speed limiting method in an urban rail transit CBTC (communication based train control system) mode. The temporary speed limiting method includes starting normal route control after uploading and confirming temporary speed-limiting information before power interruption through a data storage unit, uploading the temporary speed-limiting information periodically to an automatic monitoring system from the data storage unit, performing interactive confirming twice between the data storage unit and the automatic monitoring system, dividing the temporary speed-limiting information and then downloading the same through the data storage unit, receiving the temporary speed-limiting information and feeding the information back to the data storage unit and then downloading movement authority speed-limiting instructions by zone controllers, saving feedback results by the data storage unit, and performing speed-limiting brake to trains through an automatic protection system. With the temporary speed limiting devices in the urban rail transit CBTC mode, the defect that effective speed limiting can be carried out by completely depending on real-time communications between dispatchers and drivers in the conventional speed limiting measures is overcome, the safety coefficient is increased, and running safety is guaranteed. The invention further discloses a temporary speed limiting system.

The invention discloses a high-altitude protective suit, which comprises a gas generator and a protection airbag, which are communicated with each other through a gas conveying pipeline, and the high-altitude protective suit is provided with a falling sensor and a control unit, wherein the falling sensor is used for monitoring acceleration motion of a body and generating a corresponding acceleration signal; and the control unit is used for receiving and judging the acceleration signal and controlling the gas generator. The high-altitude protective suit has the beneficial effects that whether the high-altitude operation personnel stays at a falling state or not is judged by the control unit through the acceleration signal of the falling sensor, if the operation personnel does not stay at the falling state, the gas generator is not opened, if the operation personnel stays at the falling state, the gas generator is opened, and the protection airbag is inflated through the gas generator so as to buffer and protect the falling high-altitude operation personnel. The high-altitude protective suit initiatively senses and triggers the gas generator, so that the passive safety coefficient of the high-altitude operation personnel can be increased.

The invention discloses a granular PLA modified material for FDM printing and a preparation method of the granular PLA modified material for the FDM printing, and in particular relates to a novel environmental protection PLA modified material of the FDM printing for large industry and the preparation method of the novel environmental protection PLA modified material for the FDM printing. The granular PLA modified material for the FDM printing comprises the following components in parts by weight: 100 parts of polylactic resin, 10 to 30 parts of inorganic fillers, 5 to 30 parts of polymer elastomers and 1 to 10 parts of other additives. The PLA modified material is manufactured by granulating the components through a mixing extrusion process. The product disclosed by the invention is easy to degrade, environment-friendly and non-toxic, smooth in printing, free of smells and pollution and high in safety coefficients, the printed product has the good characteristics of smooth surface, beautiful appearance, symmetry, stable dimension, difficult shrinkage and the like and is very suitable for use in an FDM 3D printer. Furthermore, waste materials in the production process can be fully recovered and recycled. According to the invention, the polymer elastomers are added, so that the durability of the product printed by using the PLA material is further better than that of the conventional PLA material, and the product further can withstand more pressure and wear.

The invention relates to an urban rail operation vehicle and in particular relates to a straddle type monorail operation vehicle with a structure comprising two pairs of wheels. The straddle type monorail operation vehicle comprises a carriage, a steering frame, an engine, a transfer case and a walking pump, wherein the steering frame is connected with an underframe of the carriage through a central pin dragging device; the steering frame comprises a framework, a secondary suspension device and a dragging device; the overall framework is of an II-shaped full-steel installed and welded plate type box structure and comprises a side beam, end beams connected to two ends of the upper part of the side beam and two vertical beams which are connected between the end beams; a motor bracket is fixed between the upper part of the side beam and the corresponding vertical beam; two independently-driven walking wheel assemblies are mounted on two motor brackets; four guide wheel assemblies are mounted on two sides of the middle part of the side beam; two stabilizing wheel assemblies are mounted on two sides of the lower part; the secondary suspension device adopts a secondary steel coil spring assembly. The straddle type monorail operation vehicle can reasonably meet the circuit requirements of monorail PC beams and is high in safety coefficient, excellent in dragging performance, simple and compact in structure, easy to maintain, stable in running and excellent in brake performance.

The invention relates to a closing machine for lithium batteries, comprising a stand and a workbench arranged on the stand. The workbench is sequentially provided with a battery top cover assembly feed mechanism for conveying the battery top cover assembly to a cover pressing station, a battery steel shell assembly feed mechanism for conveying the battery steel shell assembly to the cover pressing station and a cover pressing mechanism for pressing the battery top cover assembly into the battery steel shell assembly, wherein the mechanisms are connected with a main control circuit. The closing machine provided by the invention has the advantages of reasonable structural design, accurate pressing position, high production efficiency and high safety coefficient, realizes that the battery top cover assembly and the battery steel shell assembly are automatically fed and pressed, greatly saves labour force and production cost, meets the requirement of batch assembly of the battery top cover assemblies and the battery steel shell assemblies and improves the market competitiveness for enterprises. Besides, the battery top cover assembly is automatically corrected in the feeding process and the battery steel shell assembly is automatically detected in the feeding process, thereby improving the quality of products and reducing the defective index.

A multi-joint endoscope bending mechanism with a force sensing function relates to an endoscope bending mechanism. In an existing medical endoscope, only one section at a head end of the endoscope is provided with bending controllability, the other parts of the endoscope do not have the function, and the surface of the endoscope is not integrated with a pressure sensor so that the contact pressure between a scope body and the intestinal canal wall can not be sensed. In the multi-joint endoscope bending mechanism, a first and a second connecting ear of a universal ring of two adjacent joints are matched and riveted with rivet clearances; a guide through hole of a guide seat on a universal ring of a start end joint of each bending uni-joint section is fixedly connected with a spring tube; four multi-strand steel wires in the bending uni-joint section pass through each spring tube and each guide through hole and are fixedly connected with a rear end circular ring; five bending uni-joint sections are wrapped by steel wire woven nets and rubber covering films from the inside to the outside; and pressure sensors are embedded in the rubber covering films. The multi-joint endoscope bending mechanism has a flexible spatial complexing bending capability and also a full-direction force sensing function. When used for examining an intestine problem of a patient, the multi-joint endoscope bending mechanism can relieve the pain suffered by the patient and is highly safe.

The invention discloses a transformer substation device maintenance safety monitoring system and method. The system adopts non-contact human body induction and wireless transceiving signal technologies. When a person approaches a device which needs to be monitored, the system carries out automatic verification on the identity of the person and makes a corresponding action and if the identity verification is successful, a camera is started to record videos of a work project, or a database takes corresponding measures of alarm check and the like so as to prevent non-maintenance personnel from approaching a dangerous device and prevent maintenance personnel from personal injuries caused by finding of a wrong target device. The database allocates operation permission electronic certificates to maintenance personnel who already obtain work tickets or operation tickets and the maintenance personnel can only enter specific allowed areas to work when wearing the operation permission electronic certificates and can maintain a device only after fingerprint verification. The transformer substation device maintenance safety monitoring system and method have the advantages of being high in spontaneity, accurate in monitoring, high in safety coefficient, reasonable in design, simple and convenient to operate and high in performance cost ratio so that the security of devices and maintenance personnel is ensured.

The invention provides a method and equipment for binding an intelligent mobile terminal and intelligent wearable equipment, and solves the problems that operation is inconvenient, a safety coefficient is low in conventional equipment binding and the like. The method comprises steps as follows: the intelligent wearable equipment has a number and can generate an encryption code, and a two-dimensional code picture is generated according to the encryption code and the number and is displayed on a screen; a related APP (application) is loaded onto the intelligent mobile terminal, the two-dimensional code picture is scanned, and then a scanning result and the number are uploaded to a server; the server judges whether transmission content is valid after receiving the data, and if the answer is positive, the uploaded data are forwarded to the intelligent wearable equipment; the intelligent wearable equipment verifies whether the data are valid after receiving the forwarded data, and if the answer is positive, a module of the intelligent wearable equipment is activated, and an activation and binding success response is sent to the server; the server binds and associates a number of the intelligent wearable equipment with the number of the intelligent mobile terminal after receiving the binding success response, and the binding operation is completed.

The invention discloses a method for calculating the slope stability safety coefficient based on strength reduction of a humidifying condition. The method comprises the steps of testing the dry density rhod, the natural moisture content omega1, and the percentage of saturated moisture content omega2 of a slope soil body sample, testing the cohesive force c and internal friction angles of samples with different moisture contents, and calculating the volume weight gamma of the samples, wherein the formula of internal friction angles is shown in the description; drawing the relation curves of the cohesive force c and the internal friction angles respectively with the moisture content omega, and obtaining a mathematic formula of a fitting relation curve; adopting a dichotomy approximation method and considering the volume weight change, and calculating the moisture content omegaF when the slope is in critical failure; calculating the slope stability safety coefficient F. According to the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition, anti-shearing strength of the slope soil body is reduced based on the humidifying condition, the method better conforms to the engineering practice that the moisture content of the soil body is increased, and thus the strength is lowered due to rainfall infiltration or irrigation or the like, and the shortcoming that a prior strength reduction method is not clear in mechanical concept is overcome. When strength reduction is conducted, the adverse influence of the increase of the volume weight of the soil body on the slope stability is further considered. Therefore, the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition is more scientific and safer.

The invention discloses a slope slipping preventing system of an electric car and a work method of the slope slipping preventing system.The slope slipping preventing system of the electric car comprises a four-channel anti-lock system, a vehicle control unit, a gear sensor, a motor controller, a motor, an accelerator pedal, a brake pedal, a hand brake switch and a gradient sensor.The accelerator pedal, the brake pedal, the hand brake switch and the gear sensor are all connected with the vehicle control unit through hard wires.The four-channel anti-lock system and the vehicle control unit are connected through a hard wire or CAN wire.The vehicle control unit and the motor controller are connected through a CAN wire.The motor controller and the motor are connected through a hard wire.According to the slope slipping preventing system, the safety coefficient of the whole car can be increased, and the slope slipping danger of the electric car is effectively eliminated.After the electric car gets into the slope slipping preventing mode, An ABS works, the motor and a battery can be effectively protected, the service life of the whole car can be prolonged, energy consumption can be effectively reduced, and driving mileage can be increased.The electric car adapts to the driving habit of a driver and can be safety driven without special operation, and the slope slipping preventing system can be fast put into use in batches.

The invention relates to an auxiliary power supply system for a motor train unit and a power supply method and a load reducing method of the auxiliary power supply system. The auxiliary power supply system for the motor train unit comprises auxiliary current transformers, a bus I, a bus II, bus connectors, a contactor box, medium-voltage loads and a low-voltage power supply system. The bus I and the bus II penetrate through the whole auxiliary motor train unit through the bus connectors on the two sides of carriages. The auxiliary current transformers and the medium-voltage loads are connected with the bus I or the bus II alternately according to the parity number of the motor train unit carriages. Part of the medium-voltage loads of the motor train unit operate in a load reducing mode or are directly disconnected when the auxiliary current transformers break down. The auxiliary power supply system operates in a parallel connection mode through the buses penetrating through the whole auxiliary motor train unit, the relative concentration and flexible arrangement eliminating mode of the motor train unit is achieved, the requirement for the redundancy of each set of auxiliary current exchanging system is low, the economic cost is greatly reduced, the power supply of the whole train unit is stable and reliable, and the passenger comfort level and the running safety coefficient of the motor train unit are guaranteed.

The invention provides a smart construction site management system based on a cloud platform, a server and a storage medium, and the system comprises a construction site module which collects work information about construction equipment and workers on a construction site; a data storage module which is used for storing the working information in a distributed manner according to the classification of workers, construction equipment and safety; a data analysis module which is used for calling the working information and carrying out real-time data analysis on the working information to generate an analysis result related to the construction equipment and workers associated with the construction equipment; a monitoring system module which is used for acquiring video information corresponding to the workers, construction equipment and safety; the cloud platform, which judges whether working personnel, construction equipment and safety on the construction site generate early warning information or not according to the analysis result and the monitored video information; and an early warning terminal which makes an early warning response according to the early warning information so asto remind the workers and construction equipment on the construction site. Through real-time monitoring, early warning feedback is analyzed in time, and the safety coefficient of construction site management is improved.

The invention relates to an automatic stamping production line for electric appliance casings. As casing parts need to be stamping / stretching-molded by multiple procedures in the existing electric appliance industry, different stamping / stretching presses are needed. Meanwhile, a large quantity of assisting labor is needed for transport, locating and the like among the procedures, so that the existing electric appliance industry also has the defects of large worker labor intensity, low safety coefficient and low efficiency. According to the automatic production line provided by the invention, four numerical-controlled stamping / stretching hydraulic machines are used for the stamping / stretching molding of casing sheets, off-line blanks are conveyed to a centering table one by one to be located after being detached by a set of disassembling and stacking manipulators, the blanks on the centering table are conveyed into a press one by one by a feeding manipulator to be stamped / stretched, the stamped / stretched blanks are taken out by a next feeding manipulator, conveyed to a next centering table to be located, sent to a next press and pressed into products, and the finished products are finally conveyed to an output machine by a discharging manipulator. The provided automatic stamping production line for the electric appliance casings is fully novel, can meet the technical requirements of electric appliance casing production and has the advantages of compact structure, simplicity in operation and convenience in maintenance.

The invention discloses a method for distributing code stream encrypting and decrypting keys in an SIP video monitoring system. In the method, in a process for calling a 3 pcc between code stream encrypting monitoring front end equipment and code stream decrypting customer premise equipment, or a process of calling a 3 pcc between the code stream encrypting monitoring front end equipment and a media server and a 3 pcc between code stream decrypting customer premise equipment and the media server, seeda, seedb and seedc, which are obtained by the monitoring front end equipment, the media server and the customer premise equipment in an identity authentication process during registration, are used as keys shared with an SIP server and identifiers, the content of an SIP signaling message bodySDP is expanded to carry the encrypting and decrypting keys, and a symmetric algorithm or asymmetric algorithm is used to guarantee the safety of the transmission of the encrypting and decrypting keys. The method has the advantages of generating different keys at each time of broadcasting, greatly improving safety coefficient, resisting replay attack and eliminating the safety hazards of the storage of the keys at multiple places.

The invention provides a method for positioning rail vehicles in real time on the basis of radio frequency identification (RFID). The method for positioning the rail vehicles in real time is characterized in that the method is based on a system comprising RFID tags, RFID read-write devices and a background server; the RFID tags are mounted among rails, the RFID read-write devices are mounted on the trains, and the background server runs and manages databases and manages software and man-machine programs; physical addresses corresponding to ID (identification) information are searched via the databases according to the ID information after the background server receives the ID information from the RFID read-write devices, information is transmitted back to the system management software, the management software transmits the read physical addresses to the man-machine programs, and the trains can be accurately positioned by the man-machine programs according to the physical addresses. The method has the advantages that the trains can be dynamically monitored, regulated, controlled and dispatched by the aid of the method, the safety of the trains can be dynamically protected by the aid of the method, accordingly, the running efficiency and safety coefficients of the rail vehicles can be improved, the system is high in positioning precision and environmental applicability as compared with the traditional method for monitoring rails, and the like.

The invention relates to a crawler belt and suction disc combined-type special walking device. The device adopts a combined integral structure with a walking crawler belt which is a synchronous belt and special suction discs which are self-designed. Through the engagement transmission between the synchronous belt and synchronous belt pulleys and the adsorption and desorption effects of the special suction discs, the device is enabled to have the function of reliably walking and flexibly steering on smooth, flat and vertical surfaces such as glass curtain walls, tile exterior walls and the like. Since the walking device adopts the crawler belt and suction disc combined structure, the walking speed is fast, the manipulation performance is good, the volume is small, the steering is flexible and the device can surmount certain obstacles. Since the desorption subsystem of the walking device adopts air-valve-type suction discs, active adsorption or passive adsorption can be realized and the walking device has the characteristics of high adsorption efficiency, high safety factor, simple structure and wide application scope.