182results about How to "Ensure accurate" patented technology

A bypass duct portion is integrally provided in a casing of an EGR cooler so that heat distortion generated at a part of the casing when bypassing of an exhaust gas is rationally absorbed, and the EGR cooler body and a valve case are brazed/fixed all together so as to improve strength of the valve case, whereby, the bypass duct portion is formed between an inner surface of the casing and the core, a switch is provided for switching and guiding the exhaust gas to either of the core or the bypass duct portion, and a large number of outer ribs formed in the circumferential direction respectively are arranged side by side while being separated from each other in the longitudinal direction in the bypass duct portion of the casing so as to constitute a heat stress absorbing portion. And a cylindrical valve case is integrally formed by deep drawing of a thin metal plate by a press machine, a pair of slits are provided at the rear end of the valve case, both edges of an intra-valve partition plate are inserted into the slits, support projection portions are provided on both faces of the both edge portions of the intra-valve partition plate, and the edge of the slit is supported by the support projection portion. And an opening of the valve case is integrally brazed/fixed to an opening of a header portion of the casing.

The invention relates to a construction process of a wind power tower tube. The construction process comprises the procedures of sectioned tube section manufacturing, tower tube flange installation, and tower tube assembly; sectioned tube section manufacturing comprises the procedures of factory inspection of raw materials, material reinspection, pretreatment of a steel plate, numerical control cutting blanking, dimensional inspection, groove machining, circle rolling, group-welding of longitudinal joints, circle rectifying, measuring of tube section ovality, 100%UT detection and T-shaped seam100%MT detection; tower tube flange installation is achieved through the procedures of flange detection, tower tube detection, flange fixing, tube body installation, welding measuring, bottom flangeassembly, tube body connection, bolt connection, tube body positioning welding and detection after welding jointly; and tower tube assembly comprises the procedures of grouping of tube sections and flange nipples, inspection, welding, 100% UT detection, inspection, drawing of position lines of inner parts, inspection, group-welding of the inner parts, anticorrosion treatment, assembly of the innerparts, packing and forwarding. The construction process has the advantage of being high in precision.

The invention discloses an automatic screw-driving machine which comprises a machine body assembly, a material guide mechanism, a material conveying mechanism, a material grabbing mechanism, a material ejecting mechanism and a screw-driving mechanism. The material guiding mechanism is arranged on a main machine frame of the machine body assembly. The material conveying mechanism is arranged on an auxiliary machine frame on one side of the main machine frame. The material grabbing mechanism is arranged between the material conveying mechanism and the material guide mechanism and conveys guide pins to the material ejecting mechanism. The guide pins are conveyed to the position below PCBs through the material ejecting mechanism. The screw-driving mechanism is arranged above the material guiding mechanism and drives screws into the guide pins. The automatic screw-driving machine is suitable for a PCB automatic machining assembly line, the functions of automatically positioning blocking materials and adjusting the sizes of the conveyed PCBs are achieved through the material guide mechanism, the automatic material feeding or blocking movement is achieved through the material conveying mechanism, the automatic conveying movement of the guide pins is achieved through the material grabbing mechanism, the automatic material ejecting movement is achieved through the material ejecting mechanism, and nuts are automatically locked on the guide pins through the screw-driving mechanism.

The invention discloses a four-rotor UAV flight control method based on a fractional order power switching law. A whole controller is of a backstepping control structure, a second-order nonlinear system of a quadrotor UAV is split into two subsystems, control laws that satisfy Lyapunov's stability theory are constructed, and the two subsystems are in series connection through a virtual intermediate control variable to form the complete controller, so that the controller can well adapt to the nonlinearity of the system and have good integrity. At the same time, in order to enhance the anti-disturbance capability and robustness of the controller, in the second backstepping design, the controlled variable is subjected to the sliding mode control design, which introduces the high disturbance resistance and high robustness of the sliding mode control. .

The invention discloses a stirring building or station embedded control system, which comprises an embedded industrial controller, wherein the communication interface of the embedded industrial controller is in communication connection with a display, an upper computer and an industrial Ethernet switch; the communication interface of the industrial Ethernet switch is connected with an input/output (I/O) controller; the signal input interface of the I/O controller is connected with the signal output end of a weighing sensor through an analog input module, and is in signal connection with a field switch through an on-off input module and an intermediate relay; the signal output interface of the I/O controller is connected with the control end of a field execution element through an on-off output module and an intermediate relay; the signal input end of the industrial Ethernet switch is connected with the signal output ends of a temperature detector, a slump detection device, a level sensor and a sand water measuring instrument; and the control output end of the industrial Ethernet switch is connected with the control input ends of a printer and a large display screen. The system has the advantage of realizing production automation of proportioning, unloading and concrete discharge in a stirring machine.

The invention discloses a data collection and energy balance control device and method for a lithium battery pack of an electromobile. The device comprises a data collection module, an energy balance module, a channel selection circuit, a communication module and a control module, wherein the energy balance module, the channel selection circuit, the lithium battery pack, the data collection module, the communication module and the control module are connected sequentially. A charging mode is selected from battery charge modules or an energy storage unit automatically by the channel selection circuit; working conditions of battery cells are collected in real time by the data collection module; the control module selects corresponding battery cell channels; energy balance control is conducted on the battery cell channels by the energy balance module; a power generation system of the electromobile and the energy storage unit are effectively used for charging the battery cells on line timely during operation of the electromobile; the device generates less heat and is good in balance effect; the service efficiency of the lithium battery pack is improved; and a driving distance of the electromobile is prolonged effectively.

The invention relates to the technical field of mechanical experimental devices and testing methods, aims to solve the problems that the test device for crack fatigue propagation rate in the prior artcannot conveniently realize the alignment of samples, and the test precision and reliability are insufficient, and provides a test device and a test method for I-II composite crack fatigue propagation rate. The test device for I-II composite crack fatigue propagation rate comprises two clamps for respectively clamping both ends of a sample, wherein each clamp comprises two clamp plates having opposite surfaces and a locking structure connecting the two clamp plates; the locking structure is configured to lock the two clamp plates to clamp the sample or to loosen the two clamp plates to release the sample; and the clamps are configured to be clamped on the corresponding end of the sample in the form of making the corresponding end of the sample clamped between the two clamp plates and connected onto the locking structure. The test device and test method for I-II composite crack fatigue propagation rate provided by the invention have the beneficial effect of conveniently ensuring that the clamped sample is in the correct, for example, centered posture, thereby ensuring the accuracy and reliability of the implementation.

The invention relates to a sinter quality prediction method based on process parameters. According to the technical scheme, determining sinter quality parameters and sintering process parameters; establishing a historical production data sample library of sintering process parameters and sinter quality parameters, and performing [0, 1] normalization processing; by taking the normalized sintering process parameters as input variables and the sinter quality parameters as output variables, establishing a sinter quality prediction model based on the process parameters by adopting a BP neural network mapping nonlinear function; and taking the sintering process parameters collected in real time as input variables and inputting into the sinter quality prediction model,wherein the output variables are the predicted sinter quality parameters. The method can predict the sinter quality parameters in advance, and has the characteristics of high prediction precision and high generalization capability.

The invention discloses a weighing check method for belt weighers, which comprises the following steps: the zero point check of a belt weigher or the calibration of a hopper weigher is carried out; abelt conveyer is switched on, and the coulter of a coal plough drops; after coal completely gets into the hopper weigher, the hopper weigher stops feeding and records the weight of the coal in the hopper weigher; the feed valve of the hopper weigher is opened, and a vibrating feeder is started; the weight of the coal on the belt weigher is recorded; the weight of the coal on the hopper weigher iscompared with the weight of the coal on the belt weigher, the relative error between both is recorded as delta, delta is equal to (M1-M2)/M1*100 percent, wherein M1 is the coal weight recorded by thehopper weigher, and M2 is the coal weight recorded by the belt weigher; if the relative error delta is less than or equal to plus or minus 0.5 percent, then the normal weighing activity of the belt weigher is resumed; and if the relative error Delta is greater than plus or minus 0.5 percent, then the interval value of the belt weigher is adjusted. The advantage of the technical solution is that the weighing check method can quickly switch production and check and can check the belt weigher at any time.

The invention relates to a fertilization control system for a circular and translational motion type sprinkling irrigation machine. In the fertilization control system, a constant pressure water supply unit is equipped to solve the hydraulic pressure fluctuation caused by switching of spray nozzle and other reasons, so that the operational reliability and spraying uniformity of the fertilization control system are improved; a control unit is adopted to adjust the variation of the pumping flow of fertilization injection along with the water supply flow of the constant pressure water supply unit, so that the precise and constant fertilization concentration and fertilizing amount within the whole sprinkling irrigation range are guaranteed, and especially, the precise and constant fertilization concentration and fertilizing amount are guaranteed in the situation of large flow variation amplitude of a circular and translational motion type sprinkling irrigation machine provided with a tail gun within the opening and closing time period of the tail gun.

The invention belongs to the technical field of network communication, and particularly relates to an automatic topology arrangement method. The automatic topology arrangement method comprises the steps of refreshing an interface to trigger automatic layout of a topological relationship of equipment; acquiring a logic relationship between equipment nodes, and calculating a hierarchical relationship of the equipment nodes; selecting an optimal layout mode according to the hierarchical relationship of the equipment nodes; and drawing a topological diagram. The automatic topology arrangement method can effectively solve confused and complicated conditions of manually moving the position of each node, realizes reasonable layout of the topological diagram quickly and effectively, and ensures the layout to be accurate and visual. When certain equipment breaks down, a network manager can locate quickly after checking and maintains timely, thereby enabling the equipment to operate normally, and improving the problem solving efficiency of the network manager.

The invention discloses a method for realizing the accurate time tick of an Ethernet. The method comprises the following steps that: a central processing unit (CPU) of a time tick device D1 immediately sends an auxiliary time tick signal through a general purpose input/output (GPIO) after reading a real-time clock t1 and the level is changed only once; then the read clock information is assembled to be a network message and the network message is sent to a reception time tick device through a physical layer interface; the reception time tick device D2 also receives the signal change through a GPIO signal, records the time and marks the time as t2; the reception time tick device receives a network time tick message and sends the network time tick message to the CPU of the reception time tick device D2 for processing; and the CPU of the reception time tick device D2 analyzes the message and then exacts time information, records the time before writing into the chip of the real-time clock and marks the time as t3, wherein the period from t3 to t2 is used as network delay and the delay of message processing of the CPU of the reception time tick device D2 and is used for correcting time information. The method has the advantage that the device is easy to implement and convenient to install.

The invention discloses a four-rotor unmanned aerial vehicle flight control method based on a fractional-order control algorithm. According to the method, a controller is of a back-stepping control structure on the whole, a second-order nonlinear system of a four-rotor unmanned aerial vehicle is divided into two subsystems, control laws meeting Lyapunov stability theories are built, and the two subsystems are serially connected into a complete controller through virtual intermediate control variables, so that the controller can effectively adapt to nonlinearity of a system and has good integrity. Besides, in order to enhance the anti-disturbance capability and robustness of the controller, sliding mode control design of controlled variables is performed in second back-stepping design, andhigh anti-interference capability and high robustness of sliding mode control are introduced.

The invention discloses a modeling method for an optical proximity correction process model. The method comprises the steps of measuring original data and line width roughness of a semiconductor process layer; and determining weighted values of all critical sizes according to the line width roughness of the measured value of each critical size, a datum line width roughness at design rule checking position of the semiconductor process layer and a datum weighted value at the design rule checking position of the semiconductor process layer. By introducing the line width roughness to determine the weighted values of all the critical sizes, to-be-measured data can be reduced; some unstable factors and random factors of process, measuring machines and measuring processes can be filtered; fitting time and convergence time of the process model establishment can be shortened; and simultaneously accuracy and reliable stability of the process model can be guaranteed.

The invention discloses a furnace top stock-level detection system for a blast furnace, which includes an absolute value coder data acquisition module, a chain wheel complete rotation round record module, a scale factor K computation module, a stock rod height calculation module and a stock height output module. When a stock rod designed range stockline and a 0 meter stockline of the master controller are determined, the absolute value coder data acquisition module respectively records readings on absolute value coders at that time, and the chain wheel complete rotation round record module records the complete rotation round number of a chain wheel during the descending process of a counter weight; then the scale factor is calculated; and finally, the actual height values of the stock rod can be calculated and output in real time in every period. The system disclosed by the invention solves the problems that the present blast furnace stock rod system is complicated and time-consuming in the zero calibration process and further affects the production.

The invention discloses automatic equipment and method for achieving high-speed laser marking and discharging packaging. The automatic equipment comprises a vibration disc, a control cabinet, a discharging sliding rail, a height adjusting mechanism, a mounting column, a laser marking head, a displayer and a conveying mechanism. The discharging sliding rail is obliquely mounted above the control cabinet through the height adjusting mechanism. The mounting column is mounted on the control cabinet. The laser marking head and the displayer are mounted on the mounting column. The vibration disc is arranged at the high end of the discharging sliding rail. The conveying mechanism is mounted at the lower end of the discharging sliding rail. According to the automatic equipment for achieving high-speed laser marking and discharging packaging, automatic feeding, automatic marking, automatic counting and discharging packaging of nuts are combined together, meanwhile marking is conducted in a double-row manner, and high-speed marking can be achieved effectively.

The invention discloses a self-adaptive rapid crystal locking method based on a Clean-up digital phase-locked loop. The method mainly solves the problems that an existing phase-locked loop is complex in circuit and can not meet a higher application requirement. The method is based on the phase-locked principle of the Clean-up digital phase-locked loop, firstly, the phase difference between a reference signal and a tested signal is worked out through frequency-inspected and phase-inspected calculation, the phase lock adaptively changes in the phase difference processing process of the software, the frequency difference and the phase difference are adjusted at the same time through a software algorithm, and then a high-precision analog-digital converter is controlled to output voltage controlled voltage to control crystal oscillation. The method is simple and can rapidly lock the phase, and meanwhile when the reference signal is affected by interference, the software can adjust coefficients in a self-adaptive mode, and smooth transition of output is achieved. The software processing mode is simple and effective, and the locking time is greatly shortened.

The invention relates to an underwater magnetic field and six-axis inertia combined positioning system. The system includes the following parts: (1) and (2) are respectively a sensing chip MPU6050 composed of a three-axis acceleration sensor and a triaxial gyroscope, (3) is a triaxial magnetometer RMG144, the two sensing chips send sensed each axis acceleration, acceleration and magnetic field intensity to a host processor (4) through an I2C bus, the host processor (4) finishes preliminary calculation of attitude and determines an absolute underwater space coordinate system, then attitude calculus and action signal discrimination are completed, the absolute position of the current underwater space and the button, function and the like needing control are output to a wireless transmission module (6), a power module (5) is responsible for power supply of the whole system, a receiving module (7) is responsible for receiving and decoding previous data and converts the data into a computer identifiable signal, and a computer (8) subjects the received data to processing and modeling, thus finishing the task of establishing an underwater space trajectory description system.