111results about How to "Reduce the hidden danger of failure" patented technology

The invention discloses an aero-engine body vibration characteristic analysis method. An engine body system is separated into a rotor system and a stator system, the rotor system and the stator are coupled through a fulcrum system and are simulated jointly through dynamic characteristics of the rotor system and the stator system; the engine body system is separated into the two study objects, i.e., a rotor bearing system and a stator bearing system, and then vibration response and dynamic bearing reaction of the rotor bearing system are simulated and analyzed through a finite element analysis platform under the action of unbalanced exciting force and rub-impact force to acquire excitory input of the stator system; at last, the acquired dynamic bearing reaction and the rub-impact force are loaded on the stator bearing system, and the vibration response characteristics of the stator bearing system is simulated and analyzed to acquire engine body vibration characteristics. The aero-engine body vibration characteristic analysis method has the advantages of reducing hidden fault danger in the design of aero-engines and providing decision bases and technical support for engine vibration faults.

The invention provides a method for extracting the fault features of rotating mechanical equipment, which comprises the following steps: (1) carrying out equal-time-interval sampling on a vibration signal and carrying out time domain processing, and extracting time domain features; (2) carrying out envelope detection processing on an equal-time-interval sampling vibration signal x(n) so as to obtain an equal-time-interval sampling envelope signal, and extracting the features of the envelope signal; (3) reconstituting an equal-angle-interval sampling envelope signal y(n) by using the equal-time-interval sampling envelope signal and rotating speed information; (4) carrying out equal-angle moving average filter processing on the equal-angle-interval sampling envelope signal y(n) so as to obtain a signal z (n); and (5) solving the Fourier transform of the signal z (n), seeking feature frequencies by using a feature frequency matching method, and extracting the fault features of a frequency domain. The method not only can suppress interferences under the condition that the resolution ratio of a frequency domain is not reduced, but also can extract actual feature frequencies under the condition that rotating speeds and mechanical parts have deviations, and therefore, smaller potential faults can be effectively found.

The invention relates to an intelligent robot routing inspection system and method for a railway machine room, and the system comprises a communication and signaling section monitoring center, networkequipment, and a routing inspection robot. The routing inspection robot comprises a wheel rail robot and a robot hung on a rail, wherein the information collected by the two robots is transmitted tothe communication and signaling section monitoring center through the network equipment. According to the invention, the wheel rail robot on an anti-electrostatic floor is used for monitoring the equipment and the environment of a machine room, and the robot hung on a rail below the anti-electrostatic floor is used for monitoring the state of a cable of a cable duct. The system effectively collects the image, data and equipment state, records the collected equipment information into a database server, compares the collected equipment information with fault information, and carries out the prejudgment or proposes a solution to a fault and feeds back the solution to an intelligent display terminal, so as to guide a signal maintainer to process the fault, thereby effectively reducing the fault rate, and improving the maintenance efficiency.

The invention relates to a bridge installation method, in particular to an installation construction process of bridge expansion joints. To effectively improve the construction quality and the service performance of expansion joints, an expansion joint device used in the bridge installation method is installed in the sequence of paving the road before joint installation, and the installation method comprises the following steps: step 1, slotting: joint cutting, slotting and steel bar checking; step 2, installation: firstly, adjusting the initial expansion amount of the product according to the actual construction temperature, lifting the expansion joint device in place and then detecting the straightness and flatness; secondly, welding after elevation measuring and fixing; thirdly, installing partition boards and then cleaning preformed grooves; step 3, concrete pouring; and step 4, maintaining. The installation construction process can ensure the smoothness of the expansion joint device, solve the problem that two sides adjacent to the expansion joint device are not easily compacted, effectively reduce the potential failures caused in the construction links, and reduce the early breakage rate; and the installation construction process can improve the management and construction level of highway construction management and construction enterprises in the bridge expansion joint construction, and realize the fine construction by adopting the mode from extensive to intensive.

The invention relates to a fastener used by a railway track, which comprises a track pitch baffle, a baffle base and an insulation track pitch block. The technical proposal is that: prepreg of thermoplastic resin composite is taken as the base material and is cut to be shaped; after being preheated, pulled, pressed, solidified and shaped, the material is made into insulation components of the track. The prepreg of thermoplastic resin composite refers to prepreg composite obtained by combining the thermoplastic resin and nemaline reinforced material; the thickness of the prepreg of thermoplastic resin composite is ranging between 0.1 mm-0.6mm, and the proportion of the reinforced material inside the prepreg of thermoplastic resin composite is 20-40 percent of that of the thermoplastic resin. The invention is characterized by great strength and modulus, good size stability, lasting static resistance, small friction coefficient, wear resistance, long service life, etc.

The invention discloses a calculation method of the health degree of a metering device, which has the advantages of being high in efficiency and comprehensive and accurate in a calculation result. The method collects the basic information data and the field operation data of the metering device, classifies the collected data and calculates the operation state value, the configuration way value and the operation working condition value of the metering device, and finally calculates the health degree of the whole metering device. The health degree of the metering device is obtained through the analysis and the calculation of the data, no people are required to carry out field inspection, so that accuracy is good, and efficiency is high. The health degree finally obtained through the calculation of the calculation method is accurate, comprehensive, and high in reliability and can accurately reflect the accuracy and the operation state of the metering device, the configuration, which is given on the basis of the health degree, of the metering device is more reasonable, a transformation suggestion is more reliable, and a configuration standard of the metering device more conforms to practical situations. The calculation method is suitable to popularize and apply in the technical field of the state evaluation of gateway metering equipment.

The invention relates to a burst speed simulative analysis method for a bolt-free structure turbine disk baffle. The method comprises the following steps: establishing a two-dimensional section model capable of accurately reflecting a blisk structure form; arranging an elastic material model; according to model features, creating an axial symmetric unit and a plane stress unit; setting a boundary condition and a load; calculating solving parameters; judging whether a solving process is converged or not; if the solving process is converged, performing post-processing to output a stress calculation result; and according to a burst criterion, calculating a baffle burst speed. According to the method, the burst speed simulative analysis is carried out for the bolt-free structure baffle, so that the baffle is ensured to work safely and reliably within a design speed range, the hidden troubles of faults in aero-engine design are reduced, and decision bases and technical support are provided for analyzing occurred engine shroud faults.

The invention discloses a fixed die core-pulling mechanism capable of self-locking and backstopping, which comprises a wedge-shaped sliding block (1), an oblique ejection rod (2), an oblique core-pulling block (3), an oil cylinder (4) and a support seat (5). By using the technical scheme that the oblique core-pulling block is connected with the wedge-shaped sliding block through the oblique ejection rod by using the frictional self-locking principle, and the oil cylinder is arranged obliquely so that the stressed included angle between the wedge-shaped sliding block and the oblique ejection rod is smaller than a frictional self-locking angle of the material, the mechanism overcomes the defects of unreliable work of a die, easy fault occurrence and instable product quality because the oblique core-pulling block retreats. In the fixed die core-pulling mechanism capable of self-locking and backstopping, the retreat of the oblique core-pulling block is prevented by the self-locking and backstopping effect of the wedge-shaped sliding block, and core pulling and resetting of the oblique core-pulling block with great retraction force are driven by the small-specification oil cylinder so that the injection molding die fulfills the purposes of reducing cost, obtaining reliable work, eliminating fault hidden dangers, stabilizing product quality and ensuring product quality consistency.

The invention relates to a finite element simulation method of a beam_plate shell structure. The finite element simulation method comprises the steps of establishing the research of a beam unit and a plate shell unit, and a finite element model; determining the boundary conditions of a beam_plate shell model; carrying out strength calculation and mode analysis; and evaluating the calculation result, wherein the establishment of the research of the beam unit and the beam_plate shell unit and the finite element model comprises the steps of researching the beam unit and setting real constants based on cross-section shape, namely carrying out parameterization on the beam_plate shell unit; researching the characteristics of the plate shell unit and the coupling characteristics of plate shell unit and the beam unit, namely coupling stiffness matrix degree of freedom; and creating the finite element model of the beam_plate shell structure by applying the parameterized beam_plate shell unit and the stiffness matrix degree of freedom. The finite element simulation method has the advantages of good grid quality, intuitive result and the like, and is beneficial to promoting the design level, shortening the design period, reducing the experiment expense, and reducing the potential fault danger.

The invention discloses an electric knife sharpener. The electric knife sharpener comprises a rack, a drive motor, a knife rest and a knife sharpening stone device, wherein the knife rest is connected to a base; a first screw rod and a second screw rod which are provided with reciprocating spiral grooves are rotationally supported on the rack respectively, a first slide sleeve and a second slide sleeve are installed on the first screw rod and the second screw rod respectively in a sleeving manner, a first pin shaft which is in slide fit in the reciprocating spiral groove of the first screw rod is fixedly connected to the first slide sleeve, and the first slide sleeve is fixedly connected to the base of the knife rest; a second slide sleeve is installed on the second rod in a sleeving manner, a second pin shaft which is in slide fit in the reciprocating spiral groove of the second screw rod is fixedly connected to the second slide sleeve, and the second slide sleeve is fixedly connected to the knife sharpening stone device; the drive motor is controlled by a control system and used for driving the first screw rod and the second screw rod to rotate according to set directions respectively by virtue of a transmission box with rotary power output. The electric knife sharpener disclosed by the invention has the beneficial effects of simple structure, low manufacturing cost, convenient installation and debugging, and few fault hidden dangers.

The invention discloses a metering device state inspection method which is high in efficiency and comprehensive and accurate in inspection result. The method collects basic information data of a metering device and collects actual operating data of the metering device in real time, classifies the collected data and calculates an electric energy meter operating state value GS, a current transformer operating state value GC, a voltage transformer operating state value GP and a secondary loop operating state value GD, finally calculates an operating state value G of the whole metering device, and determines an actual operating state corresponding to an actual state value of the metering device through a corresponding relation between preset metering device state values and operating states. The inspection method is high in efficient, a fault of equipment which is in normal operation originally does not occur due to human factors, comprehensive inspection of the state of the metering device can be realized, and an inspection result that is finally obtained is guaranteed to be accurate, comprehensive and highly reliable. The method is suitable for popularization and application in the technical field of gateway metering device state evaluation.

The invention aims to provide a servo hydraulic system of a friction welding machine. The servo hydraulic system comprises a servo motor, a hydraulic pump, an electromagnetic directional valve and a main oil cylinder, wherein the main cylinder and the electromagnetic directional valve are mutually connected, a P end of the electromagnetic directional valve is connected to an oil tank via the hydraulic pump, the hydraulic pump and the servo motor are mutually connected, and a T end of the electromagnetic directional valve is connected to the oil tank. By adjusting pressure and flow quantity via a servo controller, storage of multiple groups of parameters and welding of products in multiple specifications are facilitated, by comparing feedback of a pressure sensor with parameters set by the servo controller, pressure closed-loop control of a hydraulic system of the friction welding machine is realized, utilization power of the system is reduced, energy consumption is saved, the hydraulic system is simplified, stability of the hydraulic system is improved, hidden fault danger is reduced, and purpose of the servo hydraulic system of the friction welding machine is achieved.

The invention discloses an electric energy meter state testing method high in efficiency and comprehensive and accurate in testing result. The method is characterized in that basic information data and field operation data of an electric energy meter are collected, the collected data is classified, an electric energy meter operation state value GS is calculated, and according the corresponding relation between a preset electric energy meter state value and the operation state, the practical operation state corresponding to the practical state value of the electric energy meter is determined. According to the invention, the operation state of the electric energy meter is obtained by means of data analysis, and the efficiency is high; secondly, manual intervention is reduced, and the fault risks of the equipment is relatively low; and all aspects of the electric energy meter are comprehensively considered, the comprehensive testing on the state of the electric energy meter is realized, the accurate, comprehensive and high reliability final testing result is ensured, and the dynamic safety stability of the electric energy meter can be accurately grasped. The electric energy meter state testing method is suitable to be popularized and applied in the technical field of gateway metering equipment state estimation.

The invention relates to a feeding device and method for a container. The feeding device for the container comprises a loading box used for loading the container with one end closed and the other end open, a buffering box arranged at the lower part of the loading box and used for matching with the loading box, a guide device arranged at the lower part of the buffering box, a hopper arranged on a rack of the guide device, a container base arranged at the bottom of the hopper and connected with the hopper, and a central controller arranged on the rack and used for receiving a signal and sending out an operational order. By the adoption of the feeding device and method for the container, the sample container can be automatically put into the container base with the open end facing upwards and the closed end facing downwards by the guide device after the sample container is simply, reliably and automatically passed from the loading box to the buffering box, the feeding method is simple and reliable, the manufacturing cost and the complexity of an instrument are reduced, potential failure is reduced, and the system reliability is increased, so that the economic benefit is improved, and the enterprise competitiveness is increased.

The invention relates to a quality early warning management method for railway electric service vehicle-mounted equipment, and the method is characterized in that the method comprises the following steps: (1), installing an online monitoring device on each locomotive, and connecting vehicle-mounted equipment; (2), returning online monitoring information; (3), recording an equipment standing book and resume into an equipment management system server; (4), distributing an operation task through equipment management system terminal equipment; (5), enabling the terminal equipment to share the service data information through a network; (6), enabling the management system terminal equipment to receive the returned online monitoring information in a wireless manner; (7), carrying out operation task prompt, equipment equality early warning, equipment fault alarm and equipment parameter automatic updating when a condition is met; (8), carrying out operation according to the operation task prompt and alarm prompt, automatically downloading and operating a record data file, and carrying out the automatic testing of a locomotive signal; (9), generating operation result supervision and operation behavior analysis information and the interaction information of operation process guide, and carrying out the automatic printing of a quality certificate if the condition is met.

The invention discloses an efficient method for checking the operation working condition of an electric energy meter with a comprehensive and accurate checking result. The method comprises the following steps: acquiring basic information data of the electric energy meter and site operation data, classifying the acquired data, calculating an operation state value RM of the electric energy meter, and determining an actual operation state corresponding to an actual operation working condition value of the electric energy meter. The checking method is high in efficiency; the problem that equipment which operates normally fails due to an artificial reason; by the checking method, the primary current percentage, the primary voltage percentage, the primary load power factor, the voltage waveform aberration rate, the degree of unbalance of three-phase voltage, ambient temperature, and influence of the relative humidity of the environment on the electric energy meter are taken into consideration, so that comprehensive checking on the operation working condition of the electric energy meter can be realized, and the finally obtained checking result is accurate, comprehensive and high in reliability; the method is suitable for being popularized and applied in the technical field of evaluations on the states of gateway counting equipment.

The invention discloses an operation condition examination method for a metering device. The method is highly efficient and can provide comprehensive and accurate examination results. The examination method determines a practical operation state corresponding to an practical operation condition value of the metering device through calculating an operation condition value R1 of a current transformer, an operation condition value RU of a voltage transformer, an operation condition value RM of an electric energy meter and finally through calculating an operation condition value R of the whole metering device and according to a corresponding relation between a preset operation condition value and an operation state of the metering device. According to the examination method, the operation state of the metering device is obtained through analysis of data; on-site examination by humans is not needed; the efficiency is high; the examination method takes into consideration of examination of operation conditions of the electric energy meter, the current transformer and the voltage transformer so as to realize comprehensive examination of the operation condition of the metering device and ensure that the finally obtained operation condition examination result is accurate and comprehensive and high in reliability. The operation condition examination method is suitable for being promoted and applied in the technical field of gateway metering equipment state assessment.

The invention discloses a distributed road traffic signal control system based on 5G communication, and belongs to the field of road traffic signal control. The distributed road traffic signal controlsystem comprises an intersection control center, a distributed control signal lamp and a radar and video all-in-one machine; the radar and video all-in-one machine collects intersection traffic flowdata through a radar and a video sensor and sends the collected flow data to the intersection control center through a 5G communication network; the distributed control signal lamp collects the operation state of a signal unit through a voltage sensor and a current sensor, sends the state of the signal unit to the intersection control center through the 5G communication network, and receives and executes an operation scheme issued by the intersection control center; and the intersection control center analyzes and generates an intersection direction scheme according to the received intersection traffic flow data and signal lamp state information, sends an intersection release scheme to the radar and video all-in-one machine and the distributed control signal lamp through the 5G communication network, and completes a control node autonomous monitoring function. According to the distributed road traffic signal control system, the 5G communication technology is utilized, the functions ofan annunciator are preposed, the intersection wiring workload is reduced, and the system availability is improved.

The invention discloses a sensor on-line isolation communicating device under the pressure, and relates to the related technical fields such as electric systems and chemical engineering. The sensor on-line isolation communicating device comprises an isolation communicating device combination and a pressure, temperature and humidity composite sensor; the isolation communicating device combination is constituted by a flange outer sleeve, a movable sealing ring, a screw sleeve and an isolation inner sleeve; and gas inlets are formed in the circumferential direction of one end of the flange outersleeve and one end of the isolation inner sleeve. The invention further discloses a control method of the sensor on-line isolation communicating device under the pressure. The control method comprisesthe following steps of A, assembling; B, fixing; C, measuring; D, tooling; and E, replacing. By arranging the isolation communicating device, the structure is simple, operation is convenient and reliable, the pressure, temperature and humidity composite sensor can be disassembled and assembled online under the situation of avoiding leakage, and the problem that operating equipment cannot replace,calibrate and overhaul the pressure, temperature and humidity composite sensor under the situation of intelligent on-line monitoring is solved.

The invention discloses a sound-absorbing cotton production line, and particularly relates to the field of non-woven fabric production devices. The sound-absorbing cotton production line comprises a scrap recycling machine and is arranged in an L shape, a weighing bale opener, a cotton mixing machine, a fine opening machine, a cotton feeding machine, a carding machine and a mesh laying machine aresequentially arranged along a horizontal direction of the scrap recycling machine, a drying machine, an air cooler, a natural luster finishing machine, an edge trimmer, a cutting machine and a take-up machine are sequentially arranged along a vertical direction of the mesh laying machine, the cutting machine comprises a synchronization device, a cutting device and a first frame, and an action axis of the synchronization device is consistent with that of a conveying curtain of the sound-absorbing cotton production line. Compared with the prior art, production efficiency of the sound-absorbingcotton production line is high, product quality is high, fault hidden danger is less in the running process of a device, the service life of the device is long, production scraps can be recycled, production exhaust gas can be recycled, and the production line is friendly to production workshop environments and workers.

The invention discloses a cross interference elimination method for detection of SF6 decomposition products. The method comprises steps as follows: step 1, an SF6 decomposition product detection system structure is built; step 2, an interference model of H2 gas to a CO sensor and a SO2 sensor is established, H2 sample gases which take SF6 as base gas and have different H2 concentrations are introduced to a detection gas circuit, and an interference function is solved; step 3, a relation model of the concentration value NCO of CO and a voltage value VCO measured by the CO sensor is established, CO sample gases which take SF6 as base gas and have different CO concentrations ARE introduced to the detection gas circuit, and the actual centration N'CO is calculated; step 4, the relation model of the concentration value NSO2 of SO2 and the voltage value VSO2 measured by the SO2 sensor is established, SO2 sample gases which take SF6 as base gas and have different SO2 concentrations are introduced to the detection gas circuit, and the actual concentration N'SO2 is calculated. With the adoption of the cross interference elimination method, the most real and accurate concentration values of CO and SO2 can be calculated and detected when the sample gases in SF6 electrical equipment are detected on site.

The invention discloses a voltage transformer state detection method and aims to realize high efficiency and comprehensive and accurate detection result. The method comprises steps that basic information data and the onsite operation data of the voltage transformer are acquired, the acquired data is classified, an operation state value GP of the voltage transformer is further calculated, according to the corresponding relationship between a preset voltage transformer operation state value and an operation state, the actual operation state corresponding to the actual state value of the voltage transformer is determined. According to the method, efficiency is high, faults of the normally-operated equipment caused by artificial factors can be avoided, the basic information data, the detection date, the monitoring data and the family defect data of the voltage transformer are taken into comprehensive consideration by the detection method, comprehensive detection on the state of the voltage transformer can be realized, the detection result is guaranteed to be accurate, comprehensive and with high efficiency, and the method is suitable for popularization and application in the gateway metering equipment state evaluation technology field.

The invention provides a direct-drive barrier gate and belongs to the technical field of barrier gates. The problem of short service life of an existing barrier gate is solved. The direct-drive barrier gate comprises a base, an output shaft, a barrier gate rod and a motor, wherein the output shaft is rotationally arranged on the base, the barrier gate rod is fixed at one end of the output shaft, and the motor is fixed on the base; the motor is a low-speed large torque permanent magnet synchronous motor; and the motor drives the output shaft to rotate through a connecting rod mechanism. According to the direct-drive barrier gate, the power output efficiency is enhanced, the service life of the barrier gate is prolonged, problems that the shaking of the barrier gate rod is unstable and the barrier gate rod is not stopped in place after long-time use of the barrier gate rod are solved, the position accuracy during swinging of the barrier gate rod is improved, the locating of the barrier gate rod is more stable and accurate, the potential safety hazards and fault risks of the barrier gate are obviously reduced, the use range of the barrier gate is enlarged, the service life of a barrier gate core is prolonged by 3-5 times in the case of guaranteeing that the manufacturing cost is slightly increased (by 20-30%), the cost performance of the barrier gate core is improved, and broad market prospect is realized.

The invention discloses a front support of a fairing of a wind generating set, and belongs to the technical field of wind power generation. The front support comprises a conical cylinder, a large annular plate fixedly connected with the large end of the conical cylinder and a small annular plate fixedly connected with the small end of the conical cylinder; and the small end of the conical cylinderis connected with a plurality of hanging lugs, the hanging lugs are fixedly connected with the small annular plate, and the lower planes of the hanging lugs are tightly attached to the upper plane ofthe small annular plate. Compared with an existing front support of a fairing of a wind generating set, an integrated conical cylinder structure is adopted, the large annular plate and the small annular plate are fixedly connected with the large end and the small end of the conical cylinder respectively, due to the fact that the stress of a hub connecting end is large, the connecting strength between the small annular plate and the conical cylinder is enhanced through the hanging lugs, the supporting strength of the front support is enhanced, stress is uniform, stress concentration is avoided, and the problem that a hub and the fairing front support crack due to stress concentration is solved. The structure design is reasonable, connection is reliable, and safe operation of a fan is guaranteed.

The invention discloses an operation condition detection method for a voltage transformer and aims to realize high efficiency and comprehensive and accurate detection result. The method comprises steps that basic information data and the onsite operation data of the voltage transformer are acquired, the acquired data is classified, an operation state value RU of the voltage transformer is further calculated, according to the corresponding relationship between a preset voltage transformer operation condition value and an operation state, the actual operation state corresponding to the actual operation condition value of the voltage transformer is determined. According to the method, efficiency is high, faults of the normally-operated equipment caused by artificial factors can be avoided, influence of a secondary load value, a voltage deviation score, the environment temperature, the relative environment humidity, the primary conductor magnetic field, an outer electric field and the frequency on the voltage transformer is taken into consideration by the detection method, comprehensive detection on the operation condition of the voltage transformer can be realized, the detection result is guaranteed to be accurate, comprehensive and with high efficiency, and the method is suitable for popularization and application in the gateway metering equipment state evaluation technology field.

The present invention provides an electric cooker, the structure mainly comprises a main body, lid assembly, electric heating apparatus, a mounting space of the display portion, a displaying portion, electrical wire and a extending through spacer, a steam inpouring proof device arranged in the spacer, wherein, the steam inpouring proof device includes: a introduction portion, a bottom surface supporting portion, a through hole, a top surface supporting portion, a educing portion, a fastener, and a fixation board arranged on the top supporting portion, through which the fastener can be fixed. The invention can reduce hidden faults caused by high temperature steam.

The invention discloses an axial laminated contact / noncontact combined sealing tape type conveyer plastic carrier roller. The conveyer plastic carrier roller comprises a carrier roller shaft (8), a polyvinyl chloride (PVC) roller body (1) supported and sleeved on a bearing seat (2) through the bearing seat (2) and a bearing (7) arranged at two ends of the shaft, and an axial laminated contact / noncontact combined seal sealed in an annular cavity between the bearing seat (2) and the carrier roller shaft (8) through an end cover (4). The conveyer plastic carrier roller is characterized in that: the axial laminated contact / noncontact combined seal consists of a lamination seat (3) with a hollow columnar structure and an axial combined lamination assembly (6) arranged in a sealed groove machined in the inner wall or the outer wall of the lamination seat; the lamination seat (3) is combined with the carrier roller shaft (8) or the bearing seat (2) in an interference fit mode, and the radialclearance between the lamination seat (3) and the bearing seat (2) or the carrier roller shaft (8) is 0.1 to 1 millimeter; and the clearance between the width of the sealed groove of the lamination seat (3) and the total length of the axial combined lamination assembly (6) is 0.1 to 1 millimeter.

The invention relates to the technical field of thermal power plants, in particular to a thermal power plant fault judgment device and a detection method using the device. The thermal power plant fault judgment device comprises a cooling tower, a circulating pool arranged in the cooling tower and a liquid circulating device arranged on the cooling tower, and a first detection device used for detecting impurities in the cooling tower is arranged in the circulating pool. The first detection device comprises a first sieve plate installed in the circulating pool, a gravity sensor installed on the first sieve plate and a second sieve plate arranged in the circulating pool, the second sieve plate and the first sieve plate are sequentially arranged in a spaced mode in the vertical downward direction, and filter holes are formed in the second sieve plate and the first sieve plate. The two ends of the gravity sensor abut against the second sieve plate and the first sieve plate respectively. The thermal power plant fault judgment device and the detection method have the effects that the situation that sundries are easily accumulated in the circulating pool can be reduced, and meanwhile, the fault hidden danger of reusing circulating water is reduced.

The invention relates to the field of metal tube machining equipment, in particular to a using method of a numerical control dual-flying-saw cold slitting machine. The method is characterized by comprising the following steps that 1, a metal tube is conducted by a guide wheel device to enter a guiding tube and a conveying tube close to a feeding end; 2, the metal tube is clamped between gaps of arocker arm and a fixing block; 3, feeding mechanisms on two sets of flying saw devices simultaneously drive flying saws to move in the cutting direction and cut the metal tube, and two metal tubes ofthe needed length are cut out; 4, the two sets of flying saw devices move towards the feeding end, in the moving process, the metal tube to be slit at the feeding end abuts against the slit metal tube, the slit metal tube is forced to move towards the guiding tube at a discharging end and finally is conveyed outside. Within each working period, two metal tubes can be cut and produced, the production efficiency is greatly improved, the interval between the two sets of flying saw devices is adjusted through a screw, and the needed cutting length can be freely regulated.

The invention discloses an electric automobile motor control device, and belongs to the technical field of power electronics. The electric automobile motor control device comprises a controller. The output end of an IGBT drive power supply module is connected with the input end of an IGBT drive circuit module, the output end of the IGBT drive circuit module is connected with the input end of an IGBT module, and the output end of the IGBT module is connected with a motor; a current sensor is arranged between the IGBT module and the motor; the IGBT drive power supply module, the IGBT drive circuit module, the IGBT module and the current sensor are all connected with the controller. By means of the electric automobile motor control device, the problem that due to the fact that it is complex for an existing IGBT module motor to control a peripheral circuit and connection wires are more, the potential failures are more is solved.