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 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 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.