19results about How to "Little outside influence" patented technology

The invention relates to a high-speed surface material scanning detection motion control device, and relates to the technical field of detection of high-speed produced surface materials, the high-speed surface material scanning detection motion control device comprises a protective shell, stand columns are arranged in the two sides of the protective shell, an upper cross beam is connected to the upper portions of the middles of the two stand columns, and a lower cross beam is arranged at the bottom of the upper cross beam; driving cavities are formed in the two sets of stand columns, driving rods are connected to the middles of the driving cavities through bearings, a driving mechanism is arranged in the middle of the driving cavity on one side, and the driving mechanism comprises a fixing box, a worm gear, a worm and a servo motor; the two groups of detection probes can be driven by the driving mechanism to do reciprocating translational motion, so that scanning detection of a face material is realized, and the two groups of transmission belts are driven by the driving rod to synchronously rotate, so that the motion trail synchronism of the upper and lower groups of detection probes is consistent, the detection precision is improved, and the detection efficiency is improved. And a water cooling system and an air cooling system are matched with each other for cooling.

The invention discloses an overvoltage protection circuit of a switching power supply and the switching power supply, the switching power supply comprises a main power tube and a freewheeling tube, and the main power tube enables the switching power supply to provide an output voltage for a load according to an input voltage through periodic connection and disconnection. The overvoltage protection circuit comprises a sampling and holding unit for sampling an input voltage within a follow current time of a follow current tube and then holding a sampled signal to obtain a sampling and holding signal; and the overvoltage control unit is used for performing overvoltage protection on the switching power supply according to the duty ratio, the sampling holding signal and the characterization voltage of the overvoltage protection threshold. The overvoltage protection circuit provided by the invention samples the input voltage during the follow current period, so that the information of the output voltage is obtained according to the sampled input voltage and the duty ratio, overvoltage protection is carried out when overvoltage is output, and the overvoltage protection circuit is applicable to the specific situation that the main power tube in the switching power supply is connected with the input voltage or the reference ground, and is wide in adaptability and low in cost.

The invention belongs to the technical field of measurement of a flow field in a combustion chamber, and particularly discloses a low-emission gas turbine combustion chamber flow field simulation experiment test method which is used for performing experiment test on the vertical direction of the central axis of a swirler so as to obtain flow field characteristics of an outlet of the swirler and a head of the combustion chamber. According to the invention, a PIV test system is adopted to perform experimental test on the flow field of the coaxial staged combustion chamber of the engine, and at present, related research reports at home and abroad are few; and 2, carrying out numerical calculation on the flow field characteristics of the coaxial staged combustion chamber of the engine by coupling the constructed simplified natural gas chemical reaction mechanism and the CFD calculation model. The research results can provide theoretical basis and technical support for revealing the flow field characteristics in the coaxial staged combustion chamber of the natural gas turbine and optimizing the structure and performance of the combustion chamber. And thirdly, a numerical calculation method for the flow field of the engine combustion chamber is newly explored.

The invention discloses a radio frequency coaxial switch, and relates to the technical field of radio frequency connectors, and the switch comprises a switch body, the bottom of the switch body is fixedly connected with an installation butt joint structure, the installation butt joint structure is used for guaranteeing that an internal microstrip transmission line carries out signal transmission on a circuit board through a shielding cover, and a dynamic contact point regulation and control assembly is matched with a dynamic regulation and control assembly. Contact pressure can be automatically adjusted, it is ensured that communication signals are accurate, the contact pressure can be integrally and effectively adjusted automatically according to high-frequency signals or low-frequency signals, error codes of the communication signals caused by poor contact are reduced, the overall operation performance is improved, magnetic particles are gathered in the flexible superconducting contact points in the specific direction, and the contact quality is improved. The contact pressure is increased or reduced, so that the overall signal transmission performance can be improved, the signal loss and reflection can be reduced, and the reliability and efficiency of the radio frequency coaxial switch in different frequency signal processing can be improved.

The invention discloses an overvoltage protection circuit of a switching power supply and the switching power supply. The switching power supply generates an output voltage according to an input voltage through periodic connection and disconnection of a main power tube. The overvoltage protection circuit comprises a voltage sampling unit which samples node voltage on a sampling node of the switching power supply to obtain node sampling voltage, and the node voltage is the sum of the product of output voltage and coefficient and input voltage; and the overvoltage control unit is used for performing overvoltage protection on the switching power supply according to the conduction duty ratio, the node sampling voltage and the characterization voltage of the overvoltage protection threshold. According to the overvoltage protection method, a proper sampling point is selected to enable the sampling voltage to be related to the output voltage and the input voltage at the same time, then the node voltage is sampled to calculate the output voltage, overvoltage protection is performed, sampling is simple, the calculated amount is small, errors are small, the overvoltage protection effect is good, an auxiliary winding is not needed, and the system cost is low.

The present invention provides a post-installed segment structure and an installation method for a shield tunnel, which are used to replace damaged segments in the tunnel, including a segment fixed end and a segment sliding end. The segment fixed end and the segment sliding end are provided with a tongue and groove along the annular direction, and a telescopic member is provided in the middle. The two ends of the telescopic member are respectively connected with the embedded member of the segment fixed end and the embedded member in the segment sliding end. The telescopic member pushes the segment sliding end to slide relative to the segment fixed end along the annular tangent direction. The overall size is the same as the size of the replaced segment structure. The post-installed segment is provided with a bent bolt embedded member and a hand hole. The post-installed segment is connected to the surrounding original segments through the bent bolts. The present invention adopts advance prefabrication, shortens the construction period, reduces the possibility of re-damage during the construction process, the segment quality is controllable, the ring ovality of the segment is guaranteed, fewer people, materials and equipment are used, less investment is made in safe production and civilized construction during the construction process, and the overall cost is reduced.

The embodiment of the application discloses a landslide water content in-situ monitoring device and a landslide water content in-situ monitoring method.The device comprises a conical barrel, a pressure detection device and an isolation protection piece; the pressure detection module is arranged in the shell; the isolation protection piece is arranged in the shell and placed on the pressure detection module; a soil loading space is formed between the conical barrel and the isolation protection piece; a plurality of water permeable holes are arranged on the side wall of the conical barrel.The device has simple structure, and can realize real-time monitoring of the soil water content in the landslide according to the definition of the soil water content.Compared with the test equipment and method such as the capacitive type, the ultrasonic type, the electromagnetic pulse type and the remote sensing type, the device does not need to establish a mathematical model of the soil water content and other sound, electric physical quantities, overcomes the deviation of the water content results caused by different particle components and mineral components of the soil, and provides strong support for the landslide monitoring and early warning and the landslide sliding mechanism research.

The utility model discloses a POS (point of sale) face-scanning payment all-in-one machine, which relates to the field of payment equipment, aims to improve the payment flexibility of a POS machine, increase payment modes, reduce payment processes and enable the transaction process of the POS machine to be more convenient and faster, and is characterized by comprising a machine body, a card swiping payment part, a mobile payment part and a display control part, the machine body is provided with a power key, an SIM card slot, a charging port, a receipt printing port and a printing paper replacement port, the card swiping payment part comprises a magnetic strip card swiping slot, a chip card slot and an NFC card swiping panel, the mobile payment part comprises a face scanning payment area, a collection code, a fingerprint identification key and a code scanning window, and the display control part comprises a touch display screen and a control key. According to the POS face-scanning payment all-in-one machine, a face-scanning payment mode is added, a payer does not need to carry any payment tool, the payment process is reduced, the operation difficulty of a user is reduced, and payment is more convenient and faster.

The invention discloses a self-leveling asphalt mixture test device, which comprises a test bed, a test piece clamp is installed on the test bed, the test piece clamp comprises an upper clamp and a lower clamp, loading equipment is installed on the upper clamp and / or the lower clamp, and the loading equipment is used for driving the corresponding clamp to move towards the other clamp. Each of the upper clamp and the lower clamp comprises an inner plate and an outer plate, the outer plate is assembled on the test bed, a sliding groove is formed in the outer plate, a first sliding block is installed at the corresponding position of the inner plate, and the inner plate slides into the sliding groove through the first sliding block to be attached to the outer plate or slides out through the first sliding block to be separated from the outer plate; the test piece is arranged between the inner plate of the upper clamp and the inner plate of the lower clamp, the inner plates are independently disassembled to be pretreated with the test piece, overall disassembly and assembly are not needed, time is saved, the shielding plates are installed on the two sides of the inner plates, the space of the inner plates can be shielded, splashing of the inner test piece in the test process is avoided, and exchange between the temperature of the inner plates and the outside can be blocked or slowed down. The test precision is improved and the external influence is reduced.

A kind of permanent magnet synchronous motor bearing fault diagnosis method based on motor current analysis method, first acquisition permanent magnet synchronous motor stator U, V phase current signal, calculate W phase current;Three-phase current is obtained by space vector dimension reduction two-phase current under rectangular coordinate system, and two-phase current is carried out vector normalization processing;Based on the mechanism of action of bearing fault to current signal and the characteristics of current signal, the signal after space vector dimension reduction is carried out variation modal decomposition, the approximate entropy of modal component is calculated and the feature matrix is formed;The improved standard artificial bee colony algorithm makes the bee colony type mutually transform according to the optimal solution, and changes the bee colony initialization population generation rule, the optimal classification model is obtained by using the optimized adaptive variable type algorithm to optimize machine learning model parameter;Using optimal model, the test set in sample set is classified according to fault type, and compared with label to obtain test set accuracy rate;The present application has the advantages of high accuracy, high diagnostic efficiency and the like.

The invention discloses a dual explosion-proof device, relates to the technical field of safety protection, and is used for solving the problems that an explosion-proof box in the prior art is difficult to prevent further explosion of explosives and the protection degree of sympathetic detonation is relatively weak. The dual explosion-proof device comprises an outer explosion-proof box assembly, an inner explosion-proof box assembly, a flame-retardant assembly and an explosion-proof buffer layer, wherein the inner explosion-proof box assembly, the flame-retardant assembly and the explosion-proof buffer layer are arranged in the outer explosion-proof box assembly. The flame-retardant assembly is arranged around the inner explosion-proof box assembly, and the explosion-proof buffer layer is arranged between the outer explosion-proof box assembly and the flame-retardant assembly. Double protection can be provided for explosives, disposal measures can be automatically taken in time when the explosives are abnormal, further explosion of the explosives is prevented, the risk of sympathetic detonation is reduced, the influence of the explosives on the surrounding environment is reduced, and safety is improved.

The utility model discloses a silkworm egg hatching system, including the independent placement of hatching box in silkworm room, every hatching box is equipped with the vertical branch pipe, and the bottom of arbitrary branch pipe is closed and the upper end is through hatching box, and the upper end of branch pipe is communicated to the water vapor supply main pipe in the upper side, and the valve seat is axially spaced and is located in the side of hatching box, and the hatching frame is movably placed in hatching box, the position valve seat position of hatching frame one to one corresponds, and after being placed in hatching box, the valve seat is opened to the inside top, to directly supply the water vapor of the hatching frame of being placed. The utility model discloses the hatching box is independent and relatively closed to silkworm room, so the water vapor in the inside is less influenced by the outside, and when the hatching seat is placed in hatching box, can quickly carry out water vapor supplement, even when single hatching seat is taken out, basically will not influence the water vapor stability of the rest hatching frame in the hatching box, and the whole system can easily control the water vapor in every hatching box, and the stability is higher.

The invention provides a mining area temperature detection method based on a magnetic induction technology, and the method comprises the steps: collecting the temperature information of different positions of a goaf through a temperature sensor disposed in the goaf; based on a preset information transmission strategy, the temperature sensor transmits the temperature information to information processing equipment through magnetic induction; according to the temperature information, a spontaneous combustion risk area is determined through the information processing equipment; and displaying the spontaneous combustion risk area through preset display equipment. The temperature sensor is automatically put into the goaf along with mining operation without human intervention, the temperature of the goaf is directly measured, high-precision temperature information measurement is achieved, data is transmitted through the wireless magnetic induction communication technology, the external influence is small, and the transmission distance is long.

This invention relates to the field of precision drive and positioning technology, and discloses a three-dimensional macro-micro composite positioning stage, which includes a stage body, an X-axis motion component, a Y-axis motion component, a Z-axis motion component, and a mobile terminal platform connected to the X-axis motion component, Y-axis motion component, and Z-axis motion component respectively. The X-axis motion component includes an X-axis macro-drive and an X-axis micro-drive; the Y-axis motion component includes a Y-axis macro-drive and a Y-axis micro-drive; the Z-axis motion component includes a Z-axis macro-drive and a Z-axis micro-drive, used to jointly drive the mobile terminal platform to linear motion along the X-axis, Y-axis, and Z-axis. This invention balances large stroke and high precision, achieving three-dimensional positioning with millimeter-level stroke and nanometer-level precision. The X-axis, Y-axis, and Z-axis micro-drives use piezoelectric ceramic direct drive, resulting in high positioning accuracy and fast response speed. The overall structure of this invention is reasonable and compact, and its operation is reliable.

The application provides a prism module and an electronic device, and relates to the field of lenses. The prism module comprises a prism module, a fixing frame and a support frame. The prism module comprises a first lens, a prism and a second lens which are sequentially bonded. The fixing frame comprises a fixing surface, a first side wall and a second side wall. The fixing surface is provided with at least a first opening and a second opening. The support frame is an integral structure comprising a first support surface, a second support surface, a first side surface and a second side surface which are respectively located on the two sides of the first support surface and the second support surface. The two sides of the prism are fixed with the first side surface and the second side surface of the support frame through a side glue layer. The first support surface is provided with a first support, and the second support surface is provided with a second support. The first support passes through the first opening of the fixing frame, and the second support passes through the second opening of the fixing frame. The structure of the prism module is more compact, the prism module can be prevented from displacement and deflection, and the light path precision and imaging effect of the prism module are ensured.

The present invention discloses a wearable vision detection device based on EEG signals, including a portable EEG acquisition device, an EEG recognition module and a vision detection module; the portable EEG acquisition device is used to play a stimulation paradigm video and collect EEG signals from the subject's brain at the same time; the EEG recognition module is used to control the video playback of the portable EEG acquisition device and to verify and analyze the EEG signals; the vision detection module performs preprocessing, feature analysis and extraction, feature fusion and model detection on the EEG signals; wherein, the fusion features of the subject are detected through a pre-constructed model to obtain the subject's vision range. The present invention is based on an objective evaluation system based on visual-brainwave response, and can establish a visual function evaluation system independent of a vision chart system based on visual resolution-cognition-subjective expression, redefining the basic concept of vision; at the same time, the present invention has the characteristics of being less affected by the external environment, being applicable to a wide range of people, and being portable.

The invention discloses a protection reinforcing device for indirect thunder and lightning of a high-voltage power supply, and relates to the technical field of indirect thunder and lightning protection. Comprising a protective shell, and a separating and fixing mechanism is installed in the protective shell and divides the interior of the protective shell into two containing bins. According to the invention, the circuit can be protected from being influenced by transient overvoltage through multi-stage protection components on the circuit board, high-frequency noise and interference in the circuit can be effectively reduced for multiple times in the operation process, the system stability is improved, meanwhile, working signals of the civil aircraft can be contained, normal flowing of the working signals is ensured, and the reliability of the system is improved. The high-voltage power supply body and the circuit board in the protection shell can be comprehensively protected by matching the protection shell with the top cover, and the circuit board can be quickly cooled by arranging the cooling mechanism, so that the service life of the high-voltage power supply body is prolonged, and the service life of the high-voltage power supply body is prolonged. And the probability of protection failure caused by overheating of components of the circuit board when the circuit board deals with indirect thunder and lightning is reduced.

The utility model relates to a medicine box, in particular to an off-line identification medicine box which comprises a medicine box body and a short-distance communication device. The short-distance communication device is embedded in the medicine box body and protrudes out of the surface of the medicine box body. Compared with the prior art, the utility model solves the problem that the medicine identification technology in the prior art is not suitable for individual use, especially for old people and blind people; according to the scheme, the use of the Internet is avoided in a wireless communication mode, and the information can be read by the adopted short-distance communication equipment as long as the corresponding reading equipment gets close to a certain range, and special alignment is not needed.

The utility model relates to the technical field of vehicle speed measurement, and discloses a vehicle speed detection device which comprises a supporting mechanism, a vehicle speed detection mechanism is arranged in the supporting mechanism, the supporting mechanism comprises connecting baffles located on the two sides, and an outer supporting rod and an inner supporting rod are fixedly connected between the connecting baffles. The outer supporting rod is close to the outer edge of the connecting baffle, the inner supporting rod is close to the interior of the connecting baffle, and the outer supporting rod and the inner supporting rod are symmetrically installed on the two sides of the interior of the connecting baffle. According to the vehicle speed detection device, the rotatable speed measurement roller is arranged between the connecting baffles and connected with the intelligent terminal through the speed measurement roller, meanwhile, the blocking rollers are arranged on the two sides of the speed measurement roller, and an inverted triangle is formed between the blocking rollers and the speed measurement roller, so that the vehicle power wheel is limited, and when the vehicle power wheel rotates, the speed measurement roller rotates along with the vehicle power wheel; and rotating data are displayed through the intelligent terminal, so that safety detection is achieved, and the external influence is small when the data are detected.