32results about How to "Free from interference from external factors" patented technology

The invention discloses a 1 μm band cylindrical vector fiber laser based on a mode selective coupler, including a pump source, a wavelength division multiplexer, a gain fiber, a circulator, a single-mode cloth Bragg grating, a first polarization controller, and a second polarization A controller, a mode selection coupler and a collimator; the output end of the pump source is connected to the short-wavelength input end of the wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected to port 1 of the circulator through a gain fiber, Port 2 of the circulator is connected to a single-mode Bragg grating, port 3 of the circulator is connected to the long wavelength of the first polarization controller, mode selective coupler and wavelength division multiplexer, and the second polarization controller and collimator are connected to the mode Select the few-mode fiber output of the coupler. The invention has the advantages of high slope efficiency of fiber laser, small insertion loss and high polarization purity of column vector laser.

The present invention disclosed a robotic chess game and system based on the characteristics of the target contour and skeleton. This method proposes a rough positioning, regional segmentation, secondary accurate positioning, characteristic extraction of target contour and skeleton, and SVM multi -classifierCombined with the positioning and identification methods of chess chess pieces to realize the automatic playback function of smart chess robots at the beginning of the opening stage of the smart chess robot; this system is by ordinary Chinese chess boards and chess pieces, UARM four -free robotic arm, suction cups, cameras, light sources, PC -based control systemsFor the composition, the entire system structure is simple and easy to operate, so that the man -machine played robot can fully complete the playback function before playing, and it also has good stability in a relatively complex environment.

The invention discloses a double front axle commercial vehicle kingpin caster angle and kingpin inclination angle matching method. The double front axle commercial vehicle kingpin caster angle and kingpin inclination angle matching method is characterized in that active aligning torques and negative aligning drag torques of a first axle and a second axle are established, and according to the phase equilibrium of the active aligning torques and the negative aligning drag torques of the first axle and the second axle in a steering process, the relation of a residue steering angle related to a first axle kingpin inclination angle, a first axle kingpin caster angle, a second axle kingpin inclination angle and a second axle kingpin caster angle is established to obtain the relation of a residue yaw velocity related to the first axle kingpin inclination angle, the first axle kingpin caster angle, the second axle kingpin inclination angle and the second axle kingpin caster angle; the first axle kingpin inclination angle, the first axle kingpin caster angle, the second axle kingpin inclination angle and the second axle kingpin caster angle are taken as design variables, a proper change interval is selected, an optimization target is set, and a complex method is applied to looking for an optimal solution to constrain an optimization problem. The double front axle commercial vehicle kingpin caster angle and kingpin inclination angle matching method is simple, rapid and high in precision, and the designing and the adjustment of the double front axle commercial vehicle kingpin caster angles and main kingpin inclination angles can be effectively guided.

This invention relates to a micro-leakage automatic protection device based on micro-flow test and a method, in which, the device is set on a duct including a test control valve on a main pipeline anda control circuit connected with the test control valve characterizing that a test channel is connected on the main pipeline with the diameter far smaller than that of the main one, both ends of thetest channel are at both ends of the control valve, a micro-flow sensor is set in the channel connected with the control circuit.

A temperature sensing device of long period optical fiber raster belongs to fiber optic communications and fiber optic transduction field, formed by writing long period raster on cladding through corrosion then plate low heat-sensitive material and high heat-sensitive material on one side of optical fiber. When environmental temperature changes, expanding with heat and contracting with cold of film layer plated makes raster bend so that synchronous resonant wave length of long period optical fiber raster changes. The invention has properties of high temperature sensibility,, simple structure, good stability, resistance of high temperature, can be used in high temperature measurement and multi-point type temperature measurement.

The invention discloses a novel man-hour monitoring method. By utilizing a principle that required instantaneous fuel consumption data is different since an engine has different works under differentstates, the instantaneous fuel consumption is zero when engineering machinery is in downtime; the instantaneous fuel consumption is extremely stable and the fluctuation is small when the engineering machinery is standby; and the instantaneous fuel consumption is large in fluctuation when the engineering machinery is at work. By utilizing the principle, a working state of the engineering machineryis judged by computing a fluctuation variance yield of the instantaneous fuel consumption, and the monitoring precision is improved; a man-hour monitoring way of the monitoring method disclosed by theinvention cannot be affected by external factors, and is high in reliability and suitable for the engineering machinery such as an excavator, a loader, a bulldozer, a crane and like different varieties.

The invention discloses a truck rearview mirror, which comprises a fixing bracket, which includes a rearview mirror installation part and an upper fixing part and a lower fixing part respectively connected to two ends of the rearview mirror installation part, and the two parts are respectively connected by a hinge mechanism and a lower fixing part. The adjustment mechanism is installed on the side of the truck; the adjustment mechanism includes a housing with an accommodating channel, a pressing assembly with one end inserted into the accommodating channel and the other end protruding out, and a fixed connection arranged in the accommodating channel and with the end of the lower fixing part The casing assembly; the inside of the pressing assembly has a sliding channel, which can only slide linearly along its length in the housing; the inside of the pressing assembly is evenly distributed with a circle of spaced protrusions along its circumference; the The outer wall of the bushing assembly is provided with positioning protrusions matched with the spacing protrusions. The invention can conveniently adjust the angle and orientation of the rearview mirror, and after the adjustment, can lock the orientation and state to maintain the stable state without being disturbed by external factors.

The invention discloses a mobile fish pond feeder device which comprises a floating body, a straight running gear, a storage tank, a feeding device and a discharging device. The straight running gear includes a cable fastened to the banks of a fish pond. The whole mobile fish pond feeder device moves back and forth on the water surface by the cable as being driven by an actuating unit fastened to the floating body. The storage tank with the feeding device inside is fixed to the floating body. The feeding device comprises a packing auger sleeve and a feeding packing auger. The lower end of the storage tank is sealed and more than a half of the volume of the storage tank is below the surface of the water. The discharging device comprises a discharging motor and a rejection tray, wherein the discharging motor is arranged above the rejection tray. The discharging motor and the rejection tray are connected in a transmission way. The feeding device and the rejection tray are connected in a coaxial butt joint from bottom to top. The discharging motor is further connected with the feeding packing auger in a transmission way. The mobile fish pond feeder device significantly enlarges the feeding range and lowers the gravity center and improves the water surface running stability. Only one discharging motor is adopted as the actuating unit to realize the feeding from bottom to top and horizontal wide range of discharge.