37results about How to "Eliminate mechanical errors" patented technology

The invention provides a method for manufacturing a panda polarization-maintaining optical fiber preform. The method comprises the following steps: manufacturing an optical fiber core rod; manufacturing polarization-maintaining stress rods; symmetrically and fixedly arranging two polarization-maintaining stress rods at both sides of the core rod according to needs of the stress distribution; carrying out over-cladding deposition on the core rod and the polarization-maintaining stress rods by virtue of an outside deposition method to obtain a preform soot; and sintering the preform soot to obtain the polarization-maintaining optical fiber preform of which the cross section is circular. According to the method for manufacturing the panda polarization-maintaining optical fiber preform, the fiber core and the stress rods are subjected to over-cladding deposition by virtue of the outside deposition method so as to obtain the polarization-maintaining optical fiber preform, and thus the preform cracking defects and mechanical error caused by processing the optical fiber preform through a mechanical drilling method are eliminated and the accuracy and efficiency of processing the optical fiber preform are increased.

The invention relates to the measurement technical field, in particular to a measurement method. The measurement method comprises the steps as follows: (1) a plurality of measurement lenses are distributed by aiming at different measurement positions of an object to be measured, and all measurement lenses are fixed after being aligned; (2) the object to be measured is moved away, a grid coordinateplate is inserted, and a plurality of measurement lenses are respectively corresponding to a coordinate in the coordinate system which is marked as a datum point; (3) the grid coordinate plate is moved away, another object of the same kind to be measured is arranged on the measurement platform, a plurality of measurement lenses automatically focus on the article to be measured, and the practicalcoordinate of the practical measurement position of the article to be measured is converted by the datum coordinate of the measurement lenses; (4) a planar profile or a solid profile of the object tobe measured is virtually configured in a micro-computer according to the gained practical coordinate, thus gaining the practical parameters of the object to be measured and memorizing the practical parameters into the micro-computer. The measurement method replaces the single-lens movement of single-lens with that of the multi-lens movement, reduces the operation of movement and focusing, improvesthe measurement speed, and eliminates the mechanical errors which are caused by movement.

The invention discloses a special tool for manual turning of a steam turbine. The special tool comprises a handle, a straight gear installed on the handle, a U-shaped perforated support seat installed on the handle in a sleeving manner and used for fixing the position of the straight gear, a fixed base fixed on the U-shaped perforated support seat, and a slide base installed on the handle in a sleeving manner, wherein a nut is welded at one end of the handle or welded at each of the two ends of the handle. The special tool disclosed by the invention is simple in structure, and convenient to detach and install; an electric driving operation is not needed, thus the working efficiency of manual turning is improved; a rotor is turned 90 degrees in place every time, high efficiency and reliable accuracy are achieved, and the mechanical error generated during centring of the rotor of a steam-turbine generator due to a high jitter degree of rotor turning is eliminated; therefore, the numerical precision of centring is improved, the labour intensity of operating personnel is greatly reduced, and the personal injury accidents and equipment damage accidents generated during steel wire rope winding are avoided.

The present application discloses a probe scanning control method, device, equipment and storage medium, which belong to the technical field of ultrasonic imaging. The method includes: acquiring the first time difference and the second time difference; determining the delay time of the Nth swing scan according to the first time difference and the second time difference; after the reference time and the delay time have elapsed, controlling the sound head to start transmitting the Nth time The scan line of the secondary swing scan. The present application adjusts the delay time based on the first time difference and the second time difference, and adjusts the launch time of the scanning line in the swing scanning according to the delay time, thereby eliminating mechanical errors, so that the same group of scanning lines scans during the forward swing scanning. The scanned area is aligned with the scanned area during reverse swing scanning, which solves the problem of four-dimensional image jitter caused by the mechanical error of the probe.

The invention discloses a position detecting device for the edge of a winding-up H-shaped wheel, which comprises a bracket, a wire guiding wheel, a lead screw, a motor, a position detecting end, an encoder and two displacement sensors, wherein the two displacement sensors are used for detecting the axial distance between the wire guiding wheel and the H-shaped wheel; the position detecting end is arranged on the bracket; the lead screw is in transmission connection with the motor; the encoder is arranged on the lead screw; the lead screw penetrates through the bracket; the wire guiding wheel is arranged on the bracket; and the two displacement sensors are arranged at the position detecting end along the axial direction of the H-shaped wheel. According to the position detecting device, the detecting accuracy is high and the structure is simple.

The invention discloses a position detecting system for the edge of a winding-up H-shaped wheel of a wire drawing machine and a control method thereof. The method comprises the following steps that: (1) two extreme positions are calibrated; in the process that a controller adopts a motor to drive a bracket to move on a lead screw, the controller acquires distances from displacement sensors to the inner edge of the H-shaped wheel by the two displacement sensors and calibrates the two extreme positions according to the distances; angle values of encoders corresponding to the two extreme positions are acquired; and (2) the bracket is controlled to do reciprocating movement between the two extreme positions, and the controller drives the bracket to move along the lead screw by the motor, and controls the motor to rotate reversely when the bracket reaches the extreme positions, so that the purpose that the bracket moves between the two extreme positions in a reciprocating manner till the wire arranging procedure on the H-shaped wheel is finished. The position detecting system has the characteristics of high detection accuracy and easiness in implementation and the like and can effectively avoid the phenomenon of wire stacking at the edge of the H-shaped wheel.

The invention discloses railway track detection equipment. The equipment comprises two detection vehicles which are used for conducting multiple detective operations on railway tracks and arranged on two abreast railway tracks in a gliding mode, a cross girder expansion device which is flexibly mounted between the two detection vehicles and in a ligature direction of the two detection vehicles, and used for connecting the two detection vehicles and adapting to gauge changes between the two railway tracks, wherein the cross girder expansion device includes a long shaft extending in the ligature direction of the two detection vehicles, and both ends of the long shaft are rotatably connected with one group of flexible component of the cross girder respectively; two groups of the flexible components of the cross girder are arranged symmetrically to the midpoint of a lengthwise direction of the long shaft, and each of the flexible components of the cross girder is connected to a corresponding detection vehicle in a detachable mode. The railway track detection equipment has the advantages of being easy to carry, convenient to push forward during detection, simple in operation during detection, and the measuring basis of the railway track detection equipment is sole, therefore the influences of mechanical errors are able to be eliminated, and the accuracy of measurement is improved extremely.

The present invention relates to an embedded polarization state measuring apparatus, which is composed of a detection unit (1), liquid crystal type adjustable-phase delayer(s) (3, 4), a polarization beam-splitting prism (5), a collective lens (6), a photo detector (7) arranging in a shaft of a first part of the detection unit (1); a collective lens (8) and a photo detector (9) arranging in a shaft of a second part being orthogonal with the first part; a control unit (2) containing a signal-collection and liquid crystal control module (10), a data treatment module (11), a display module (12) and a RS232 serial port (13). By means of replacing rotational wave sheet by the liquid crystal type adjustable-phase delayer, It is able to control polarization state of incident light and measure Stokes parameter for real time quantity of polarization state accurately, and to overcome mechanical vibration problem; it is used for collimation of optical element(s), measurement of optical phase delay, material representation, medicament development, communication equipment, ellipse polarization instrument and spectrum application as well as space optical communication.

The invention discloses a focusing method and device for video monitoring. The method includes: calculating the positions of the short-focus end of the lens and the motor position of the long-focus end of the lens according to a statistical calculator corresponding to the definition of the video monitoring image; The statistical calculator calculates the motor drive step length corresponding to the mechanical error, and calculates the motor drive step length corresponding to the mechanical error at different positions of the motor; from the short-focus end of the lens to the long-focus end of the lens, the focus curve is fitted according to the statistical calculator; when the scene changes Or when the focus is manually triggered, the motor is driven according to the current video surveillance image definition statistics calculator and the current position of the motor, and the calculation of the definition operator is continued on the regained frame of video surveillance image to obtain a new focus position, and the cycle continues Until the motor position with the highest definition is found, the focus is completed. The invention can simplify the production process, improve the production efficiency, change the focus of video monitoring from manual to automatic, save manpower, and improve the focusing effect of point light sources.