48results about How to "Timely shutdown" patented technology

The invention belongs to the technical field of optical fiber amplifiers, which more particularly relates to a two-section erbium-doped optical fiber amplifier which has two sections and can control the gain. The optical fiber amplifier comprises a two-section erbium-doped optical fiber amplifying part and a gain control part, wherein the two-section erbium-doped optical fiber amplifying part comprises a 980mn pump laser source, a two-section erbium-doped optical fiber, an optical isolator, a signal and pump multiplexer, and a signal and pump demultiplexer; the gain control part comprises the signal input and output and the power measurement of output return light, as well as a controller of the pump laser device. The two-section optical circuit structure can effectively isolate an ASE noise in counterpropagation, thus optimizing the noise isolation performance of the amplifier. The gain control part can implement the gain control and optimization of the amplifier by monitoring the output power of the pump laser device.

The invention discloses a detection device and method used for rope disorder in the process of multi-layer winding around a reel, and belongs to a rope winding detection device of a winch. Contact switch supports of a detection mechanism of the device are installed between a linear bearing and a lead screw nut, and contact switches are connected to the contact switch supports. A detection device support is installed in front of the reel, bearing pedestals and a motor support are installed on the detection device support, a lead screw motor is installed on the motor support and connected with a lead screw through a lead screw coupler, the lead screw nut is installed on the lead screw, and optical shaft supports are installed on the bearing pedestals. An optical shaft is locked on the optical shaft supports through locking bolts, the linear bearing is installed on the optical shaft, an encoder is installed on an encoder support, the encoder support is installed on a reel support, the encoder is connected with the reel through a reel coupler, and the signal wire of the encoder and the signal wires of the strip-shaped contact switches are connected to the input end of a PLC. The detection device can conveniently, rapidly and accurately monitor rope running of the reel on line, it is avoided that because steel wire ropes are disorderly wound, rope damage or breakage occurs, and the service life of the steel wire ropes is prolonged.

A discharge lamp, and particularly a high-pressure gas-discharge lamp (an HID (high-intensity discharge) lamp or UHP (ultra-high performance) lamp), having a reflector and a cooling means is described. The cooling means comprises at least one nozzle ( 3 ) by which a flow of gas can be directed onto the discharge lamp, the at least one nozzle ( 3 ) being so arranged that it does not extend, at least to any substantial degree, into a beam path produced by the lamp ( 2 ) and the reflector ( 1 ). In this way, the cooling means does not produce any obstacles on the beam path for the light. With preferred embodiments, it is possible to produce a turbulent flow that surrounds particularly the discharge vessel ( 21 ) of the lamp and that considerably increases the effectiveness of the cooling means. Further embodiments also allow the discharge lamp to be operated in a plurality of different positions without individual regions of the lamp being too little or too severely cooled.

The invention discloses an intelligent monitoring system of a packing box. The intelligent monitoring system comprises a sensor system, a data acquisition unit, a data transmission unit and a data monitoring unit, wherein the sensor system consists of a plurality of sensors with different functions, and the sensor system is used for acquiring a corresponding temperature signala humidity signal, pressure difference signal, dip angle signal and vibration acceleration signal; the data acquisition unit is used for acquiring the temperature signal, the humidity signal, the pressure difference signal, the dip angle signal and the vibration acceleration signal, packing the signals and transmitting to the data transmission unit; the data transmission unit is used for transmitting the received data to the data monitoring unit; the data monitoring unit is used for receiving the data, storing the data as historical data, also judging whether the data fall in a threshold value range and generating an alarm signal when the data do not fall in the preset range, and the alarm signal is transmitted by the data transmission unit to the data acquisition unit. The intelligent monitoring system is convenient for monitoring the packing box and small in occupied space.

A high power optical fiber laser key point protection device is disclosed and comprises an optical fiber (1), and the optical fiber has a melting point position (2). The high power optical fiber laser key point protection device is characterized in that the optical fiber (1) centered around the melting point position (2) is uniformly wrapped with heat conduction and light guiding glue (4), and the optical fiber (1) wrapped with the heat conduction and light guiding glue (4) is mounted on a heat dissipation base plate (3); a pressure sensor (5) is mounted above the middle of a part, positioned at one side of the optical fiber (1), of the heat conduction and light guiding glue (4); a first minisize temperature sensor (6), a second minisize temperature sensor (7) and a third minisize temperature sensor (8) are respectively mounted above one end, the middle and the other end of a part, positioned at the other side of the optical fiber (1), of the heat conduction and light guiding glue (4); the pressure sensor (5), the first minisize temperature sensor (6), the second minisize temperature sensor (7) and the third minisize temperature sensor (8) are respectively connected with an alarm device (9); the alarm device is connected with a laser power source controller (10). Via the high power optical fiber laser key point protection device, the melting point position of the optical fiber can be well protected.

The invention discloses a switching power supply and a control chip thereof. The control chip comprises a logic circuit, an OCP comparison circuit, a driving circuit, a power switch transistor circuitand a PWM signal pulse width sampling and comparison circuit. The output end of the logic circuit is connected with the input end of the driving circuit and the input end of the PWM signal pulse width sampling and comparing circuit, The output end of the driving circuit is connected with the input end of the power switch circuit, the output end of the OCP comparing circuit is connected with the input end of the logic circuit, and the output end of the PWM signal pulse width sampling and comparing circuit is connected with the input end of the OCP comparing circuit. As that pulse width sampleand comparing circuit of the PWM signal is increase, the inductor current can be turned off in time when the system is disturbed by noise and the VCC voltage waveform is sharp, and the inductor current saturation phenomenon is avoided.

The embodiment of the invention discloses an electric leakage detection and switch control method and system based on the Internet of Things, and the method comprises the steps that an Internet of Things cloud platform establishes communication with a water leakage and electric leakage detection device through a network control protocol, and receives a detection signal; the Internet of Things cloud platform establishes association information of the water leakage and electric leakage detection device and a power supply main switch and stores the association information in a local mapping table; the water leakage and electric leakage detection device sends alarm information to the Internet of Things cloud platform and gives an alarm for display; and the Internet of Things cloud platform searches a power supply main switch associated with the water leakage and electric leakage detection device and sends an instruction to close the power supply main switch. According to the invention, theInternet of Things cloud platform obtains the power line alarm condition collected by the water leakage and electric leakage detection device and controls the turn-off of the power supply main switch, so that the power line is timely turned off when the electric equipment is immersed in water, the absolute safety of the power line is ensured, and a maintenance department can be notified in real time to carry out maintenance through the Internet of Things cloud platform.

The embodiment of the invention discloses a charging detection circuit. The circuit can be used in cooperation with a battery and a charging circuit of the battery. The charging control circuit comprises: a switch control unit, a voltage detection unit, a control unit and a display unit, the input end of the voltage detection unit is connected with the battery; the output end of the voltage detection unit is connected with the control unit, the input end of the display unit and the control end of the switch detection unit are both connected with the control unit, one end of the switch detection unit is connected with the connecting end, and the other end of the switch detection unit is grounded. The voltage detection unit is used for sampling the voltage of the battery and outputting thevoltage to the control unit, and the control unit is used for controlling the display unit to display according to the voltage of the battery and/or controlling the switch control unit to be switchedon or switched off.

The invention relates to a controllable silicon multi-standby voltage switched control circuit. The controllable silicon multi-standby voltage switched control circuit comprises a first controllable silicon control circuit module for external output, a second controllable silicon control circuit module for external output, a first control isolation relay, a second control isolation relay and an ICU detection circuit. Two controllable silicon control circuit modules are respectively connected with two control isolation relays, so that a control signal is provided; the ICU detection circuit is respectively connected with two control isolation relays, so that an alternative delay control signal is provided; and the output ends of the first controllable silicon control circuit module and the second controllable silicon control circuit module and the input ends of the first control isolation relay and the second control isolation relay are connected at the same joint. According to the controllable silicon multi-standby voltage switched control circuit disclosed by the invention, ordered working of a power supply is realized by utilizing the working relationship of voltage difference; isolation control is carried out by utilizing a signal type relay; and, whatever output conversion controllable silicon is switched from low voltage to high voltage or from high voltage to voltage, another controllable silicon cannot be in an instant conduction state.

The invention discloses a rail transit wagon door surface pretreatment method. The method comprises the following steps of first, workpiece conveying, wherein a workpiece conveying system conveys a to-be-treated workpiece into a shot blasting chamber, a paint spraying chamber, a drying chamber and a dust removal chamber in sequence; second, shot blasting cleaning, wherein a shot blasting device conducts shot blasting treatment on the workpiece entering the shot blasting chamber, shots obtained after treatment enter the two sides of a shot blasting chamber body and flow into a sand sliding hopper along the shot blasting chamber body, and the shots in the sand sliding hopper are conveyed to a top transverse screw through a bucket elevator, are cleaned by a cleaner and then enter the shot blasting device through a fan-shaped distribution valve; third, paint spraying, wherein an automatic spray gun in the paint spraying chamber sprays paint to the upper surface and the lower surface of theworkpiece subjected to shot blasting cleaning at the same time; and fourth, drying, wherein the drying chamber dries the painted workpiece. The method has the advantages that shot blasting rust removal treatment is conducted on the surface of a rail transit wagon door, and the mounting precision and the using effect of the rail transit wagon door are guaranteed.

The invention belongs to the technical field of clothes treatment equipment, in particular to clothes treatment equipment and a window mat heating system and method thereof. The window mat heating system comprises a main control board, a time relay and a heating device, wherein the main control board is used for sending a heating instruction to the time relay under the condition that the window mat needs to be heated; and the time relay is used for allowing the heating device to heat the window mat after receiving the heating instruction for a set period of time. The window mat heating systemrealizes the starting of the window mat heating through the connection of the main control board, the time relay, a socket, a plug and the heating device, and the stopping of the window mat heating through the connection with the main control board (a temperature sensor and a humidity sensor), and thus the purpose of drying the window mat more fully and uniformly on the premise of giving sufficient reaction time to users and ensuring the service life of equipment is realized.

The invention discloses an STO control and drive circuit which comprises an external STO circuit input, an STO wave sealing logic signal filtering and shaping circuit, an STO logic signal amplifying circuit, an STO drive signal generating circuit and an STO failure backup circuit. According to the invention, the turn-off torque output is realized most directly and effectively, the circuit works independently and is not limited by an inherent complex control and drive circuit of an original system, and the motor torque can be turned off timely and effectively when the motor torque output needs to be turned off timely.

The invention relates to a liquid rocket engine test run diaphragm box type end face sealing fault monitoring method, which comprises the following steps of: firstly, setting a pressure measuring point and a temperature measuring point at a blow-off inlet of an isolation cavity of a liquid rocket engine, setting a pressure measuring point and a temperature measuring point at a fuel side discharge port, and setting a pressure measuring point and a temperature measuring point at an oxidant side discharge port; then monitoring parameter thresholds are set, parameters of all the measuring points are collected in real time, and when the parameters exceed the corresponding thresholds, it is judged that an end face sealing fault occurs. Meanwhile, the end face sealing leakage amount can be calculated.

The invention discloses a non-woven fabric winding device. The non-woven fabric winding device comprises a rack, a current collector, a controller and a winding disc, wherein the winding disc is driven by a variable-speed motor, fabric guide arms are arranged on the front end of the rack, a portal frame is arranged on the front ends of the fabric guide arms, non-woven fabric passes through the middle of the portal frame and is guided to the rack by the fabric guide arms, and a vertical photoelectric switch is arranged on the top end of the portal frame; a transition arm is arranged between the fabric guide arms and the winding disc, a horizontal photoelectric switch which is used for emitting infrared light is arranged on one side of the part, between the transition arm and the winding disc, of the rack, another horizontal photoelectric switch which is used for receiving the infrared light is correspondingly arranged on the other side of the part, between the transition arm and the winding disc, of the rack, and the vertical photoelectric switch and the horizontal photoelectric switches are electrically connected with the current collector. When the non-woven fabric is broken or no non-woven fabric exists, the non-woven fabric falls down, the infrared light is instantaneously shielded, and the variable-speed motor is controlled to power off by the controller after a signal is received by the current collector, so that the winding disc of the non-woven fabric winding device stops winding, and hidden dangers to the product quality are avoided.

The invention discloses a silicon carbide MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving circuit which comprises an anti-bridge-arm crosstalk circuit, the anti-bridge-arm crosstalk circuit comprises a driving chip U1, a capacitor C5 and a switching tube T1, and an output end of the driving chip U1 is connected with one end of the capacitor C5 and is connected with a grid electrode of a silicon carbide MOSFET; the other end of the capacitor C5 is connected with a collector electrode of the switch tube T1, an emitter electrode of the switch tube T1 is connected with a source electrode of the silicon carbide MOSFET and is connected with a grounding end GND3, and a base electrode of the switch tube T1 is connected with a grid electrode of the silicon carbide MOSFET. The silicon carbide MOSFET driving circuit has the advantages of simple structure, bridge arm crosstalk prevention, common mode interference suppression, short circuit protection, overvoltage protection and the like.

The anti-collision laser cutting device with the follow-up protection structure comprises a cutting workbench and a laser cutting head, the laser cutting head is installed on the inner side of a lifting installation frame, and a supporting spring is fixedly welded between the lifting installation frame and the lower end of a movable sleeve frame. The laser cutting head forms a sliding lifting structure on the inner side of the movable sleeve frame, side movable frames are hinged to the left side and the right side of the movable sleeve frame, side poke rods are arranged at the attaching positions of the side movable frames and the laser cutting head, and deflection structures of the side movable frames form a synchronous adjusting structure for a lifting structure of the laser cutting head through the side poke rods. According to the laser cutting head, a side edge protection structure is formed for the laser cutting head through the side edge installation structure of the side movable frame, meanwhile, a linkage adjustment installation structure is formed between the side poke rod of the side movable frame and the laser cutting head, flexible disassembly and assembly of the laser cutting head are facilitated, and meanwhile hard collision of a laser cutting head body is effectively avoided.

The invention discloses electrical equipment detection equipment based on infrared detection, and the equipment comprises a supporting pedestal, the lower side of the supporting pedestal is fixedly connected with a low-speed motor, the main shaft end of the low-speed motor is horizontally and fixedly connected with a rotating disc, and the upper side of the edge of the rotating disc is rotatably connected with supporting plates. A top plate is horizontally and fixedly connected to the position over the rotating disc, a storage battery pack is fixedly installed in the middle of the upper end face of the top plate, an infrared detection mechanism is arranged at the position where each supporting plate is located, and a power connection mechanism is connected to the top plate. The low-speed motor is started to drive the rotating disc to rotate, electrical equipment rotates and translates along with the rotating disc, and in the process. A linkage gear rolls along an inner gear ring and the supporting plates are rotatably connected to the position of a mounting opening, so that the supporting plates drive the electrical equipment to rotate; therefore, the infrared thermal imaging cameras distributed at the upper, lower, left and right positions are convenient to detect the electrical equipment in an all-round manner.