226results about How to "Normal operation impact" patented technology

The invention discloses an abnormal vibration analysis-based GIS (gas insulated switchgear) mechanical fault diagnosis method and system. The GIS (gas insulated switchgear) mechanical fault diagnosis method includes the following steps that: vibration signals on a GIS are acquired; de-noising processing is performed on the acquired signals through using a threshold de-noising method; various kinds of feature information contained in the signals are extracted by using a narrowband noise aided multivariate empirical mode decomposition (EMD) method; the power feature of the signals is extracted by using a power density function, and the maximal amplitudes of the power spectra of all IMF of each channel are calculated so as to form power feature matrixes under measured conditions; and a power feature matrix under a normal condition and / or power feature matrixes under various kinds of fault conditions which are obtained through tests are adopted as judgment criteria of faults. Compared with a traditional method, the method and system of the invention have no influence on the normal operation of a whole power system, and can monitor the running state of the GIS safely and reliably, and are suitable for being applied to GIS substations of various voltage levels.

The invention discloses a device for detecting a storage battery, comprising a CPU, an operational amplifier, a multi-way switch, a digital / analog (D / A) converter, a high-power MOS tube, a coupling capacitor, a programmable bandpass filter and an analog / digital (A / D) converter. The high-power MOS tube is connected on a storage battery discharge detection circuit in series. The CPU is used for controlling discharge of the storage battery so as to generate excitation current. The detected current signals and voltage signals are amplified by the operational amplifier after the coupling capacitorsubtracts the direct current component, and the signals are transmitted to the A / D converter to be changed into digital signals after the programmable bandpass filter gets rid of the interference signals, then the digital signals are transmitted to the CPU to be processed and complex impedance of the storage battery under the corresponding frequency can be obtained after arithmetical operation. The CPU can control the MOS tube via the D / A converter to change the waveform and frequency of the discharge current of the storage battery so as to realize measuring a plurality of frequencies of the storage battery. A detecting method using the device can be used for detecting the storage battery by an AC discharge method in multiple frequency points.

The invention relates to an internal threat detection system based on mining of a business process model and a detection method thereof. The detection system comprises a model mining module, an abnormality detection module and an abnormality analysis model, wherein the model mining module implements model mining according to an event log of each business event in a business system, and thus acquires a business control flow model, a business performance model and an executor behavior model; the abnormality detection module detects logic abnormality, performance abnormality and behavior abnormality of the event log generated during a real-time operation process of a business activity according to the model mining module; and the abnormality analysis model parses a detection result of the abnormality detection module, recognizes execution information about implementation of an internal threat and outputs the information. According to the internal threat detection system based on mining of the business process model established in the invention, the internal threat behavior existing in the business execution process is effectively detected, a powerful support is provided for enterprises and various organizations to prevent the internal threat, and information security of enterprises and organizations is effectively ensured.

The invention relates to a wireless access point switching method and device applied to a mobile terminal. The method comprises that a preset application which runs at present in the mobile terminal is monitored; an expected network transmission rate of the preset application which runs at present is calculated; a practical network transmission rate generated when the mobile terminal is connected to a present wireless access point is detected; whether the practical network transmission rate is lower than the expected network transmission rate is determined; and when the practical network transmission rate is lower than the expected network transmission rate, an instruction request for switching the present wireless access point to another wireless access point is sent to the mobile terminal. According to the invention, the request for switching to another wireless access point can be sent to the mobile terminal when the detected network transmission rate of the mobile terminal cannot meet a practical requirement.

The invention provides a holding touch detection method of an edge of a touch panel, and the method comprises the following steps of judging whether the state of an edge area is changed or not; deleting a first edge signal if the state of the edge area is not changed; and updating the first edge signal to be a next benchmark signal if the state of the edge area is changed. The invention also provides a holding touch detection device of the edge of the touch panel. Due to the adoption of the detection method and the detection device, the state and data of the edge area can be detected in time and updated dynamically, so that the edge touch signal can be deleted from the touch signal of the touch panel to obtain a normal touch signal, and the influence of the edge holding touch on the normal operation of the touch panel can be reduced.

The invention disclosed a baffle type tray for gas-liquid mass transfer in the field of petrochemical processing to resolve the problem of low efficiency, complex structure, large investment and small processing capacity for gas-liquid mass transfer for the present float valve and baffle type tray. The tower plate (3) of the baffle type tray of the invention is composed of the down steps along the direction of the liquid flow. The sieve pore (5) or the valve orifice on which float valve is fixed are opened on each step of the tower plate (3). A oblique downwards arc skirt plate is mounted on the top of the arc where the highest step tower plate (3) intersects with the wall (1) of the tower under the tower plate (3). The invention may be used in the rectification tower, absorber, thionizer and regeneration tower, etc.

The invention provides a blending and treating system for ventilation air methane and drainage methane in a coal mine. The blending and treating system comprises a ventilation air methane inducing cover (6), a ventilation air methane conveying pipeline (7a), a drainage methane connection pipeline (4), a mixer (M), a mixed gas conveying pipeline (7b), an induced draught fan (11) and a heat-accumulating type high-temperature oxidation apparatus (12). A gas outlet of the drainage methane connection pipeline (4) is communicated with the ventilation air methane conveying pipeline (7a), so the drainage methane is sucked into the ventilation air methane conveying pipeline (7a) from the drainage methane connection pipeline (4) and uniformly blended with the ventilation air methane in the ventilation air methane conveying pipeline (7a); and the obtained mixed methane is conveyed to the heat-accumulating type high-temperature oxidation apparatus (12) by the mixed gas conveying pipeline (7b) for oxidation treatment. The blending and treating system can realize safe acquisition, blending and conveying of the ventilation air methane and the drainage methane in the coal mine, provides a safe gas source for subsequent utilization projects like heat-accumulating type high-temperature oxidation and discharges thoroughly oxidized products into the atmospheric environment.

The invention discloses a dustproof 270 degree holographic projection cabinet in the holographic projection equipment field. The dustproof 270 degree holographic projection cabinet comprises a cabinet body, a support plate and a projector; the cabinet body is internally provided with a power supply adapter, a controller and a draught fan; the support plate is arranged on the upper end of the cabinet body; the top end of the support plate is provided with a top plate which is arranged above the cabinet body; the projector is embedded on the lower end of the top plate; three pieces of film-coating glass are distributed between the top plate and the cabinet body in a manner of Chinese character Ao; the three film-coating glass pieces are arranged on the outside of the projector; the sides of the two opposite film-coating glass pieces are respectively fixed on the sides of the support plate; the bottom ends of the three film-coating glass pieces are fixed on the cabinet body; the cabinet body on the outside of the bottom end of the film-coating glass is provided with an exhaust outlet facing the film-coating glass surface; and the exhaust outlet is communicated with the draught fan. The dustproof 180 degree holographic projection cabinet can perform effective continuous cleaning on the holographic projection screen through the arrangement of the draught fan, the wind channel and the wind shield, enables the holographic image to always keep clear without the manual cleaning, and enable the cleaning of display screen of the 180-degree holographic device to be convenient and labor saving.

The invention aims to overcome the defects of the prior art and provides a sealed elastic compensation sleeve with reliable quality, no leakage, low cost and long service life. In the sealed elastic compensation sleeve, a sleeve is sleeved on a wall penetrating pipeline, the end of the sleeve and the pipeline are connected in a sealing way by an elastic pipe fitting, and a water-stop plate is fixed on the sleeve and embedded into a wall and connected with the pipeline into a whole. Thereby the invention realizes the function of elastic compensation and achieves the sealing effect without leakage.

The invention belongs to the technical field of power sources, and particularly relates to an all-solid-state high voltage pulse current source with positive and negative pulse output. The all-solid-state high voltage pulse current source is composed of a series of basic discharging units connected in series, namely, half-bridge circuits connected in series or full-bridge circuits connected in series, and meanwhile inductors are connected with loads in series. According to the all-solid-state high voltage pulse current source, the low-voltage half-bridge or full-bridge circuits are used as the basic discharging units of a series circuit, therefore, the charging voltage of a system can be effectively lowered, the safety and the reliability of the power source can be improved, and the size of the power source is greatly reduced. The power source can have strong adjustability through adjustment of synchronous control signals of switching tubes, and the power source has very strong flexibility in aspects of the output voltage, the pulse width, the working frequency and the like. Detail modification can also be conducted on output pulse waveforms through asynchronous control over all the discharging units, and therefore obtaining of more accurate pulse output is facilitated.

The invention discloses a harmonic impedance measuring device of a tractive power supply system and a test method of the device. The device can obtain relatively complete voltage and current harmonic characteristics of the tractive power supply system by carrying out disturbance test on the tractive power supply system only once, and further obtain accurate harmonic impedance characteristic of the tractive power supply system; the characteristics can be displayed in a display screen in real time; and data and technology support is provided for harmonic resonance and stability analysis of the tractive power supply system on the basis of an impedance analysis method.

The invention relates to an electronically controllable pneumatic brake system (100), comprising: at least two brake circuits (A, B, C), wherein at least one of the at least two brake circuits (A, B,C) is assigned an electrically and pneumatically controllable control valve (11, 13) for specifying brake pressures (p1, p2, p3, p4, pPB) for controlling wheel brakes (1, 2, 3, 4) of the associated brake circuit (A, B, C); and a first control unit (110), which is designed to electrically control the control valve (11, 13) in question in accordance with a vehicle target deceleration (zSoll) requested in an automated manner or in accordance with an actuation (ds) specified by the driver by means of an actuation device (24a). According to the invention, at least one bypass valve (21) associated with a control valve (11, 13) is also provided, which bypass valve is designed to pneumatically (pA, pB) control the associated control valve (11, 13), wherein the pneumatic control (pA, pB) is performed in accordance with the vehicle target deceleration (zSoll) requested in an automated manner or in accordance with the actuation (ds) specified by the driver.

The invention relates to a non-contact multi-point grounding detection method and system for a secondary circuit of a current transformer. A changing magnetic field is exerted on a neutral line in a secondary circuit; on the basis of Faraday's law of electromagnetic induction, whether a current is generated in the neutral line is determined; and only when two-point grounding occurs at the secondary circuit is the current generated in the neutral line. And if only one-point grounding occurs at the loop, no current is generated. The system comprises: a signal injection system, which is used for exerting a changing magnetic field perpendicular to the neutral line in the neutral line; a signal acquisition device, which is used for collecting the current of the neutral line; and a data processing and grounding criterion system, which is used for determining whether multi-point grounding occurs. According to the invention, the method and the system can be applied to a transformation substation for determination of current transformer secondary circuit multi-point grounding examination; and on the premise that normal running of the protection device is ensured to be not influenced, whether multi-point grounding occurs at the secondary circuit of the current transformer can be effectively detected.

The invention discloses a single-phase PFC (Power Factor Correction) circuit power frequency ripple eliminating method, a PFC topological system and a charging pile system. The single-phase PFC circuit comprises a single-phase PFC device, a phase-shifting control full bridge circuit and a transformer, wherein the single-phase PFC device is connected with the phase-shifting control full bridge circuit; the phase-shifting control full bridge circuit is connected with the transformer; the transformer is connected with a load. By adopting the single-phase PFC circuit power frequency ripple eliminating method, the PFC topological system and the charging pile system, the output voltage and load voltage of the single-phase PFC device 100 can be acquired. The phase-shifting time is calculated through a preset phase-shifting time calculation model according to a preset circuit parameter, and the phase-shifting control full-bridge circuit is driven to perform phase-shifting adjustment accordingto a corresponding driving signal generated by the phase-shifting time in order to keep voltage fundamental wave which is transmitted to the two ends of the load through each carrier period of the phase-shifting control full bridge circuit constant, thereby eliminating power frequency ripple caused by the single-phase PFC circuit, and effectively improving the security of the single-phase PFC circuit.

The invented method adopts the clock signal provided by GPS system as time reference, utilizes the velocity-measuring device of power generator self-body to accurately measure rotating speed of generator, and calculates the change condition of generator rotor position in the mode of integrating rotating speed and calculates integration constant (i,e, initial power-angle) in the equivalent circuitmodel so as to further obtain the real-time power angle of power generator and rotor position. Said invention method is easy to implement in engineering and possesses strong in-situ anti-interferencecapacity, and can be extensively ap9plicable to turbo-unit and hydroturbine unit.

The invention discloses a method for realizing anti-external hanging of online games, and the method comprises the following steps: 1) a server end sends challenge information to a client randomly and waits for the client to respond; (2) after receiving the challenge information, the client runs script codes of the challenge information which is sent by the server end in a virtual machine, and sends the result to the server end; 3) after receiving challenge response returned by the client, the server end compares the challenge response with an expected result at the server end, if the result is in accordance with the expected result, the game client is thought to be legal and trustable; if not, the game client is thought to be illegal and not trustable. By using the method, the existing or potential external hanging can be attacked effectively so as to reliably safeguard the interests of normal users and game companies.

The invention discloses an MYSQL (My Structured Query Language) database based SQL information acquisition and audit system. The MYSQL database based SQL information acquisition and audit system comprises an MYSQL communication message analysis module, an SQL statement syntax parsing module and an MYSQL communication error code module, wherein the MYSQL communication message analysis module is used for completely analyzing SQL statements of a communication message, parameters carried by the SQL statements and execution results of the SQL statements by analyzing a communication protocol between an application system client of an MYSQL database and the MYSQL database, and then data sources are provided for other modules; the SQL statement syntax parsing module is used for carrying out effective structural decomposition on the SQL statements so as to form an SQL operation log library; the MYSQL communication error code module establishes an MYSQL database error code library and analyzes the operating condition of an MYSQL database based application system by combining a database access request and a request response result with the MYSQL database error code library. The MYSQL database based SQL information acquisition and audit system has the advantages that the application system is not required to be subjected to any configuration change and modification, any effect on the normal operation of the application system does not exist, and a powerful support for promptly understanding the operation state of the system can be provided for users and application system providers.

The invention discloses a gasification furnace underground water prevention and control method for underground coal gasification, which comprises the following steps of pumping and draining part of water in an overlying water filling and containing layer on a top plate of an underground coal gasification furnace from a pressure-reducing draining well; and re-injecting drained and discharged water into a water injection layer by a water injection well, wherein the water injection layer and the overlying water filling and containing layer are the same water filling layer or different water filling layers, and after water draining and discharging are carried out on the overlying water filling and containing layer, the underground water level in the pressure-reducing draining well is equal to or greater than a safety design water level of the gasification furnace. The invention also provides a gasification furnace underground water prevention and control device for the underground coal gasification, which comprises the pressure-reducing draining well, the water injection well, a water draining pipeline and a water sucking pump, wherein one end of the water draining pipeline is in the pressure-reducing draining well and extends into the overlying water filling and containing layer, the other end of the water draining pipeline extends into the water injection well, and the water sucking pump can be used for pumping water in the draining water filling and containing layer into the water injecting layer. The method and the device can effectively prevent damage of under ground water on the underground coal gasification.

The invention discloses a cigarette filter tip defect online detection device of a cigarette making and plug assembling machine and a method thereof, which belong to the technical field of machine vision. The device comprises an image acquisition module, a control module and a touch display screen, the image acquisition module is in communication connection with the control module through a USB, and the control module is in communication connection with the touch display screen through the Ethernet. According to the method, the image acquisition module is fixed at a photoelectric detection sensor of a filter tip of an original FLO cigarette detector, so that field installation and debugging are facilitated; the image acquisition module is fixed through the adjustable mounting plate, so that the distance of the image acquisition module relative to a detection drum is adjustable, the distance of the detection head relative to the end surface of the cigarette filter is omnidirectionally adjustable, and a good detection effect is ensured; meanwhile, the light source is separated from the two sides of the lens and illuminates the two sides at an inclination angle of 30 degrees, so thatlight supplement of the end surface of a to-be-tested cigarette filter is more uniform, imaging is clearer, and the test precision is improved; and multiple algorithms are adopted to process the imagedata, so that the detection precision is improved.

The invention provides a three-step denitration technology for front-end smoke of a bagasse boiler in a sugarhouse. The three-step denitration technology is characterized by comprising the following steps: (1) recycling combustion of the smoke: flue smoke between a draught fan of a dust collector at a bulged part at the bottom of a hearth and a chimney is used as boiler feeding air and part of bottom primary air and is conveyed back to a main combustion region of the hearth of the boiler; (2) biomass low-NOx mixing combustion is adopted to consume residual oxygen in the boiler smoke to promote NOx reduction; (3) external SNCR denitration: NOx is further reduced by a reducing agent. According to the three-step denitration technology, discharge with standards of the NOx in the smoke from the bagasse boiler in the sugarhouse is realized, and the denitration efficiency can be over 70 percent.

The invention discloses a pantograph conductor height and stagger value measuring method based on a monocular image. The method comprises the following steps: firstly, installing car roof hardware equipment, wherein the car roof hardware equipment comprises an industrial camera, a stroboscopic light supplementing lamp and a control panel, and the image of the industrial camera is transmitted to avehicle-mounted industrial personal computer for stagger value and conductor height calculation; and secondly, installing a vehicle bottom vibration compensating module, wherein the vehicle bottom vibration compensating module comprises two laser triangulation ranging modules, the laser triangulation ranging modules are used for measuring the height from a train chassis to a rail in real time andtransmitting the height to the vehicle-mounted industrial personal computer. The invention provides a railway pantograph and overhead contact wire system real-time detection method based on a single camera, which is a non-contact type method and cannot cause bad influence on normal operation of a train, the cost of the method is far lower than that of other methods, and simultaneously, errors caused by train vibration are also taken into account, so that the accuracy of detection is further promoted. According to the method, real-time monitoring can be carried out on the state of a railway pantograph and overhead contact wire system, and real-time early warning can be performed on possible accidents.

The invention discloses a power supply management method based on a vehicle-mounted wireless terminal. The power supply management method comprises the following steps: determining a voltage threshold V; detecting the voltage of a main power supply of the terminal; comparing the voltage of the main power supply with the threshold V; switching to a standby battery to supply electricity when the voltage of the main power supply is lower than V; shutting down power supplies of modules step by step according to the under-voltage time of the main power supply; and switching back to the main power supply to supply electricity when the voltage of the main power supply recovers. According to the power supply management method provided by the invention, when the main power supply of the terminal generates an abnormal phenomenon that instantaneous under-voltage occurs and quickly recovers, a power supply management module can recognize that the instability is transient, and the standby battery is switched to supply electricity at the transient moment, so that the normal operation of the terminal is guaranteed not to be influenced; when the under-voltage time of the main power supply is long, the power consumption modules can be shut down step by step in a certain order, and when the main power supply of the terminal recovers to normal, the power consumption modules are started step by step; when a core power supply of a Linux system is shut down, time for storing data is provided, so that data can be prevented from being lost.

The invention relates to a switch handle protection and measurement device operating handle remote control device and method, belonging to the technical field of power supply maintenance. The technical scheme is that the front center of a shell is provided with a switching switch handle (2) which is matched with a switch-on and switch-off switching shaft or handle on a switch cabinet, the switching switch handle (2) is connected to an output shaft of a stepping motor (6), the stepping motor (6), a PLC (7) and a motor controller (8) are arranged in the shell, the PLC (7) is connected to the stepping motor (6) through the motor controller (8), a wireless module (9) and a power supply are connected to the PLC (7), a magnetic part is formed by multiple strong electromagnets (3) and is arranged around the switching switch handle (2), and the multiple strong electromagnets (3) are connected to the power supply through a manual switch. The switch handle protection and measurement device operating handle remote control device and method have the advantages that the staff can operate the operating handle on the switch cabinet when the staff maintains a certain distance from the switch cabinet, the operation is accurate, the observation is convenient, and the personal safety of the staff is not threatened.

The invention discloses a rapid decentralization device and method used for a subway decentralization platform to a rail-travelling area. The rapid decentralization device includes a decentralizationladder. One end of the decentralization ladder is connected with the lower end of an end sleeve. The upper end of the end sleeve is connected with the decentralization platform in a rotation mode. Thedecentralization ladder is provided with an annular bolt. The decentralization platform is provided with a groove. The groove is internally provided with a locking device. The annular bolt can be inserted into the groove. The locking device can lock and release the annular bolt. In the decentralization process, by operating the locking device, locking of the decentralization ladder can be rapidlyrelieved. Because one end of the decentralization ladder is released and the other end of the decentralization ladder is connected with the decentralization platform in a rotation mode, under actionof gravity, the decentralization ladder rotates to a state of being perpendicular to the decentralization platform; passengers can expand the decentralization ladder on the decentralization platform and place the decentralization ladder on the rail-travelling area; the passengers on the decentralization platform can rapidly transfer to the rail-travelling area to be decentralized through the rapiddecentralization device. The rapid decentralization device is convenient to mount and simple and convenient in operation, has no any effect on normal operation of a subway train, and has important security implications for decentralization of subway interval tunnel personnel.

The invention discloses a device and method for dragging a dust removal fan through industrial boiler steam. The device mainly comprises a turbine, the dust removal fan, a motor and a speed change clutch. The turbine is connected with an input shaft coupler of a transmission; the clutch is arranged at the low-speed end of the transmission, the input end of the clutch is connected with a large gear of the transmission, the output end of the clutch is connected with an output shaft, and the output shaft is connected with the dust removal fan through an output shaft coupler. According to the device and method for dragging the dust removal fan through the industrial boiler steam, steam of waste heat of a boiler is used for driving the fan to remove dust, when the steam is insufficient, automatic supplement is conducted through the motor, the phenomenon that the surplus steam is diffused, so that energy is wasted and environment is polluted is avoided, a large amount of electric power is saved, and the benefits of energy conservation, emission reduction and environmental protection are achieved. In addition, when any of the turbine or the motor breaks down, normal operation of the dust removal fan and normal technological production are not influenced.

The invention discloses a high-voltage switch cabinet fault monitoring device, which comprises gas probes (6), gas pipelines (7), a gas detector (9), a gas pump (10), an outlet pipe (8), a normally-closed solenoid valve (11), a waste gas filter (12) and an information processing module (51). Through detecting gases generated by discharging, fault of the high-voltage switch cabinet is monitored, and thus, electrified monitoring and continuous monitoring on hidden fault inside the switch cabinet can be realized. Through the gas probe with a horn-type opening structure arranged in each compartment inside the high-voltage switch cabinet, the gases are detected and decomposed, the gas detector (9) is adopted to measure the contents of components of each gas, and according to information such as discharged decomposed gas type and the concentrations obtained through detection by gas probes (6) arranged at different positions, the information processing module (51) judges hidden fault. The gas pipelines (7) are arranged along the insulated separators and the inner wall of the high-voltage switch cabinet. The gas probes (6) and the gas pipelines (7) are made of insulated material, preferably, polytetrafluoroethylene material.

The present invention provides a method and device for testing the stability of BMC de-escalation. The method includes: determining the target number of de-escalation processing for the base board management controller BMC; performing de-escalation processing on the BMC; The state information of the BMC after the BMC carries out de-escalation processing; judge whether the total number of times that the BMC is de-escalated reaches the target number of times; if not, execute the described BMC to carry out the de-escalation process; if yes, According to whether each of the status information is normal, it is further judged whether the upgrade stability of the BMC is qualified. The device includes: a determination unit, a processing unit, an acquisition unit, a judgment unit and an execution unit. This solution can improve the stability of the server.

The invention belongs to the technical field of operating systems, and particularly relates to an implementation method of a cross-domain network terminal virtual machine based on separation of threepowers. Compared with the prior art, when an operating system structure is designed, a three-power separation principle in a political system is used for reference, namely, strategy making, strategy implementation and user program execution are separated and run on three different virtual machines respectively. The independence among the parts is ensured by utilizing the strong isolation characteristic among the virtual machines, and the cooperation and restriction among the parts are realized by utilizing a specially designed communication mechanism among the virtual machines. Management, I / Oexecution and user operation of an operating system are distributed to different virtual machines for operation on the basis of a security base with three independent rights, the problem that a traditional operating system is too high in rights and is a manager of computer resources and a user of the computer resources at present is solved, and the congenital security problem of a computer is solved from the aspect of a computer system structure.

The invention provides O-shaped anti-skidding cable plywood for a coal mining machine, belonging to the technical field of cable sheath fixtures. The coal mining machine can safely works on inclined fully mechanized faces by using the O-shaped anti-skidding cable plywood. The technical points are as follows: a cable clamp is composed of a left backing plate and a right backing plate with steel core injection molding structures, as well as an upper and a lower connecting plate; the upper and the lower ends of a left support frame and a right support frame are respectively provided with symmetrical mortises; the front and the back ends of the left support frame and the right support frame are respectively provided with metal yokes and connecting pieces; the left and the right ends of the upper and the lower connecting plate are respectively provided with a tenon, and the tenons are matched with the mortises on the left and the right support frame; the tops of the left and right support frame (1) are respectively provided with an anti-skidding tooth (14), and the lower middle parts of the left and the right support frames (1) are respectively provided with an open cavity; and the open cavities are internally provided with an approximately 7-shaped non-return paw (4) respectively, wherein the non-return paws are formed by horizontally installing tapping screws at the outer sides of the left and the right support frames.

The embodiment of the invention discloses a method, system and a broadcasting server for broadcasting user pictures. The method comprises the following steps of: generating user signature information according to obtained pictures; sending picture broadcasting requests with the user signature information; and broadcasting the obtained and stored pictures when the user signature information is checked valid. Thus, the risk that the client side is attacked by malignant requests is reduced, and the experience of the user is improved.