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 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 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 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 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 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 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 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.