42results about How to "Reduce adjustment requirements" patented technology

The invention discloses a two-axis photoelectric collimator based rotary table division error detection method. The two-axis photoelectric collimator based rotary table division error detection method includes the steps: (1) mounting a multi-tooth division table at the center of the working face of an inspected rotary table, fixing a planar mirror onto the multi-tooth division table and using an autocollimator for collimating the planar mirror; (2) enabling the inspected rotary table to rotate for a circle so that both two axes of the photoelectric autocollimator have numerical reading; (3) placing the inspected rotary table at the zero position, reading initial values of the two-axis photoelectric autocollimator, then rotating the multi-tooth division table by an angle phi, and enabling the planar mirror to rotate by the angle phi along with the inspected rotary table; (4) enabling the planar mirror to rotate by the angle phi towards the opposite direction along with the multi-tooth division table, enabling the photoelectric autocollimator to collimate the planar mirror again and read measurement values until a circle is completed; and (5) changing an inclination angle of the multi-tooth division table relative to the rotary table while keeping the two-axis photoelectric autocollimator immovable, repeating the step 2, the step 3 and the step 4 for secondary detection, and reading measurement values of the two-axis photoelectric autocollimator. By the aid of the method, the requirement on adjustment is lowered.

An optical coherence tomography device based on a wave front dividing interferometer is disclosed. The device includes a light source, an optical interferometer, a beam scanning unit, a control and data acquisition unit and a detection spectrometer. The optical interferometer comprises an optical circulator having an a end, a b end and a c end, a first collimating lens, a total-reflection beam splitter and a reference arm. Light emitted by the light source enters the a end of the optical circulator, is output from the b end, passes through the first collimating lens and forms a collimated beam. A part of the mirror surface of the total-reflection beam splitter is located in the collimated beam, and divides the collimated beam into two paths respectively entering the reference arm and the beam scanning unit. Reference light and sample light which are respectively returned from the reference arm and the beam scanning unit form an optical interference signal through the first collimatinglens, and the optical interference signal enters the bend of the optical circulator, and is output from the c end. The control and data acquisition unit acquires an image by using a spectrum of the optical interference signal by the detection spectrometer, and also sends a drive signal to the beam scanning unit.

The invention discloses a large, thick, high-strength and high-toughness TMCP type steel plate and a production method thereof. The large, thick, high-strength and high-toughness TMCP type steel plate is composed of, by weight, 0.06%-0.08% of C, 0.20%-0.40% of Si, 1.40%-1.50% of Mn, 0.015% or less of P, 0.005% or less of S, 0.020-0.030% of Nb, 0.030%-0.050% of Alt, the balance Fe and inevitable impurities and 0.20% or less of Pcm. According to the steel plate, the components are simple, only a proper amount of microalloy Nb is added, and the precious elements such as V, Ti and Ni are not added; production cost is low, and the probability of large-scale production is increased. The steel plate is of a mixed structure mainly containing bainite, ferrite, pearlite and martensite and has a good comprehensive mechanical property; the steel plate is better in matching of the components and the strength and toughness, and it is guaranteed that the steel plate has the excellent comprehensive mechanical property; particularly, the impact performance of half of the plate in the thickness direction is good at the low temperature of minus 40 DEG C, and the method can be widely used for producing low-temperature-resistant building steel and engineering steel used in extremely cold climate. The method has the advantages that the production cost is low, and the technique is simple; the performance of products is excellent, and the comprehensive mechanical property of the products is stable.

The invention relates to a structure notch filter designing method which is used for structure notch filters for large flight envelope range flight or multi-task flight airplanes or changing along with the flight state. Design is conducted under the condition that the requirement for the sufficient pneumatic servo elastic stability margin of an airplane is guaranteed, the method includes the steps that an airplane envelope is divided, pneumatic elasticity analysis without the structure notch filter is conducted on the airplane envelope, frequency points and damping coefficients which are preliminarily obtained are adjusted according to an adjustment principle, and finally a transmission function of the structure notch filter is obtained. By the adoption of the structure notch filter designing method, the adaptability of structure notch filter design is improved, the pneumatic servo elastic stability margin is improved, the requirement for adjusting flight control law technical parameters is lowered, and the flight performance is improved.

The invention consists of a totally reflecting mirror, an output mirror and a laser working medium. The totally reflecting mirror consists of medial surface of first right angle truncated cone and the lateral surface of the reverse right angle taper cone. The first right angle truncated cone and the right angle taper cone have coaxial symmetry axis of rotation , their medial surface and lateral surface all are highly reflective surface. The output mirror is composed of round plane beam splitter and totally reflecting mirror in concentric ring shape, and they have coaxial symmetry axis of rotation. The totally reflecting mirror in concentric ring shape is composed of the medial surface of the second right angle truncated cone and the lateral surface of third right angle truncated cone, and both right angle truncated cone have coaxial symmetry axis of rotation, and their medial surface and lateral surface all are highly reflective surfaces.

An apparatus for repairing oxygen gun is composed of upper and lower platforms, stair way between two platforms, repair room and slag removing room on lower platform, the lifter of oxygen gun in the repair room, electric hydraulic carriage on upper platform for moving oxygen gun horizontally, and two electric hoists fixed to top beam for moving oxygen gun in vertical and horizontal directions. Its advantages are less investment, less possessed ground area, and no deforming of oxygen gun.

The invention provides a contact tube assembly and a strip submerged arc surfacing machine head, relates to the field of strip surfacing equipment, and solves the problem of unstable welding quality in the prior art. The contact tube mounted on the strip submerged arc surfacing machine head comprises an integral electrode, a single-petal electrode, an electrode connecting plate, an electrode pressing plate and an electrode pressing mechanism, wherein the electrode connecting plate is connected with the integral electrode and the electrode pressing plate, the electrode pressing plate is connected with the single-petal electrode through a conductive cable, and the integral electrode and the single-petal electrode are oppositely arranged and used for clamping a welding strip; the electrode pressing mechanism comprises a lever mechanism and a first elastic piece, the lever mechanism is fixedly connected with the electrode connecting plate, one end of the lever mechanism is connected with the first elastic piece, the other end of the lever mechanism is connected with the single-petal electrode, and the electrode pressing mechanism is used for pushing the single-petal electrode to the integral electrode to clamp the welding strip. The contact tube assembly provided by the invention enables the welding strip to be in good contact with the electrode, and the welding quality is improved.

The invention provides a camshaft gear with a phase adjustment function. The camshaft gear with the phase adjustment function comprises a gear body. Internal spline teeth are machined in the position of a center hole of the gear body. The number of external engaging teeth of the gear body is different from the number of the internal spline teeth of the gear body. Compared with the prior art, the camshaft gear with the phase adjustment function has the following advantages that (1) the internal spline teeth are machined on the camshaft gear and connected with an external spline of a camshaft or an external spline of a spline shaft in a matched mode, and the number of the external teeth of the camshaft gear and the number of the internal spline teeth of the camshaft are designed, so that various circumferential staggered angles between the camshaft and the camshaft gear are achieved, and accordingly flexible adjustment of the valve timing phase angle is achieved; and (2) the structural design is simple, adjustment is flexible, initial phases of the camshaft and the camshaft gear are not designed any more, the requirement for assembling precision is greatly lowered, the production and assembly technique is simplified to a great extent accordingly, and flexible adjustment of the phase angle is achieved.

The present invention relates to a method for preparing a test sample using FIB and a test sample, the method comprising: providing a pre-treated sample having a target layer, the target layer havinga first surface and a second surface opposite to each other; fixing the pretreated sample on a sample table; carrying out first thinning on the pretreated sample by adopting an ion beam along the direction towards the first surface and/or the second surface of the target layer, and thinning the pretreated sample to a preset thickness; forming a plurality of through holes penetrating through the pretreated sample; and continuously carrying out second thinning on the pretreated sample with the through hole until the target layer is thinned to a target thickness. According to the method, deformation of the target layer in the thinning process can be avoided.

The invention provides a calibration system which comprises a calculation unit, an optical transmitting and receiving device, a reflector, a rotary table and a guide rail, wherein the reflector is installed in the center of the rotary table, the guide rail is connected with a guide rail sliding block, the optical transmitting and receiving device is installed on the guide rail sliding block, the optical transmitting and receiving device is suspended right above the reflector, and the optical transmitting and receiving device is connected with the computing unit. The invention also provides a measurement method of the calibration system. The system has the beneficial effect that the included angle data of the guide rail moving shaft and the rotary table rotating shaft can be accurately collected.

The invention provides a manufacturing method of a holographic diffractive optical element. The manufacturing method comprises the following steps of calculating needed fringe distribution and phase distribution; converting the fringe distribution and the phase distribution to template depth distribution and exposure distribution; according to the template depth distribution and the exposure distribution, manufacturing a photoresist mask on a photoresist substrate; copying the photoresist mask to chromium metal to generate a surface micro-structure, and obtaining a chromium template; copying the surface micro-structure on the chromium template to a diffractive optical substrate, and obtaining the holographic diffractive optical element. The needed diffraction pattern obtained by the adoption of a computer algorithm is not influenced by actual optical element manufacturing errors, flaws, environment stray light and optical system adjusting errors; electron beam scanning or ultraviolet scanning is adopted for conducting exposure to manufacture a photoresist template. The chromium template is manufactured by the adoption of an electroforming method without complicated holographic exposure optical path, the adjusting requirements on an optical system are reduced, and the influence of environment factors is dramatically reduced.

The invention discloses a PBF vacuum filter flushing tank assembly which comprises a box body, brackets, bearing blocks, a guide roller shaft, upper flushing pipes, lower flushing pipes and a sealing felt, and is characterized in that two brackets are respectively arranged on the front and rear sides of the box body; the brackets are in bilateral symmetry along the center line of the box body; the bolted bearing blocks are arranged above the brackets; the guide roller shaft is arranged between the bearing blocks; a mesh belt is arranged below the guide roller shaft; two upper flushing pipes are arranged above the mesh belt; two lower flushing pipes are arranged below the mesh belt; the inlet and outlet are formed in the left and right sides of the box body; the center of the inlet and the outlet and the center of the guide roller shaft are arranged at the same horizontal position; and the bolted sealing felt is arranged at the inlet and outlet. The PBF vacuum filter flushing tank assembly disclosed by the invention has the beneficial effects of low requirement on mesh belt adjustment and good flushing effect.

The invention discloses a device for measuring a metal linear expansion coefficient based on pinhole imaging, comprising a bottom plate, wherein one end of the bottom plate is provided with an opticalscreen by welding by a support rod, a shielding cover is arranged at a side edge of the optical screen, alternate light and dark stripes are adhered to one side of the optical screen, the distance between the stripes is 0.1mm, and a black recording plate is adhered to the bottom end at the inner side of the shielding cover. The device is scientific and reasonable in structure and safe and convenient to use, and mini-elongation of two ends of a metal bar can be respectively measured by minitype X-axis displacement components at two ends of the metal bar, so that the measurement result is moreaccurate; the experiment is low in optical path adjusting requirement, only the positions of two laser emitters need to be adjusted, the operation is simple, alternate light and dark stripes with thespacing of 0.1mm are adhered to the surface of the optical screen, direct reading is facilitated, an aluminum alloy pipe with good heat conducting property is adopted as the metal bar for transferringheat for the heating device, and a heating pipe is directly put into the aluminum alloy pipe, so as to avoid heat waste and be more energy-saving and environment-friendly.

The invention provides strip electrode submerged arc build up welding equipment, and relates to the field of strip electrode build up welding equipment. Problems in the prior art can be solved, the equipment comprises a machine head mounting base and a strip electrode submerged arc build up welding machine head, the machine head mounting base is provided with an upper connecting base and a lower connecting base which are coaxially mounted and can oppositely rotate around the axis, the lower connecting base is fixedly connected with a hanging base assembly with the strip electrode submerged arcbuild up welding machine head, the equipment is divided into an upper part and a lower part which can oppositely rotate, 90-degree torsion of a welding strip can be achieved, and build up welding intwo directions is achieved.