1713results about How to "Low machining accuracy requirements" patented technology

The invention discloses a harmonic oscillator of a solid fluctuation gyro, which comprises a resonance ring (1), a resonance transmission part (2), a chassis (3) and a piezoelectric element (4), wherein, the resonance ring (1) is connected with the chassis (3) through the resonance transmission part (2), the resonance transmission part (2) is composed of support beams (21) which are uniformly distributed in the circumferential direction, and the piezoelectric element (4) is arranged on the support beams (21). The invention further discloses the solid fluctuation gyro provided with the harmonic oscillator. The solid fluctuation gyro and the harmonic oscillator of the invention have the advantages of high sensitivity, good sensing effect, convenient machining, low machining cost, simple mechanical balance procedure and the like.

The invention relates to an arc oscillation-based gas shielded welding arc tracking method which comprises the following steps that after the welding is started, a welding gun starts doing a periodic oscillation along a direction vertical to a weld joint; a current sensor carries out real-time sampling on a welding current; sampled data is filtrated; filtered data is subjected to deviation judgment and converted into deviation data; and the deviation data is converted into a movement command, and a weld joint track is compensated in real time through a deviation rectifying device. Because sampled signals are filtered by adopting software, the arc oscillation-based gas shielded welding arc tracking method is high in response speed and tracking precision; and due to the adoption of a dual-filtering mode, the signal mutation caused by instable arc is reduced, the deviation compensation dosage is calculated by using known welding parameters, the support of a database or expert system is not needed, the requirement of a welding device on a weldment processing precision is lowered, and thus the arc oscillation-based gas shielded welding arc tracking method is an effective means for realizing the flexible automatic welding.

The invention provides a multi-polarization SAR compact polarimetry calibration method which comprises a calibration field compact polarimetry SAR data preprocessing process and a polarization distortion parameter calibration process. In the calibration field compact polarimetry SAR data preprocessing process, compact polarimetry SAR data radiation correction and Faraday rotation correction are mainly completed. In the polarization distortion parameter calibration process, four different types of common corner reflectors are used as reference calibrators, and a compact polarimetry calibration method (namely, a compact polarimetry polarization distortion parameter calibration method) is deduced based on a calibration model. Through the method, a polarization distortion parameter can be calibrated precisely. The calibration algorithm does not depend on the absolute RCS values of the corner reflectors, and calibration error caused by RCS inconsistency of different corner reflectors can be avoided effectively. The algorithm is of high robustness and practicability.

The invention discloses a semiconductor laser radar visibility meter which comprises a laser emission system, a receiving optical system, and a signal collecting and control system, and is characterized in that: the laser emission system comprises a semiconductor laser, a coupling lens, a first coupling optical fiber, a transmitter-telescope, and a flat mirror with reflection and transmission functions; the receiving optical system comprises a receiving telescope, a second coupling optical fiber, a photodetector, and an amplifier; the signal collecting and control system comprises an AD collecting card, a computer and a door control system; and the AD collecting card is connected with the computer by a stacked way. The visibility meter has small and convenient structure, strong applicability and simple operation, can measure horizontal and slant visibility data in real time, and provides reliable visibility information for the fields of meteorology, transportation, environmental protection and military and the like.

The present invention discloses a method of cryogenic surface activation direct bonding for preparation of a quartz glass capillary tube. According to the method, a wet chemical method is used to activate a quartz glass surface, and the manner of direct bonding of a stack of multiple layers of glass is applied, so as to prepare the quartz glass capillary tube at a lower temperature with a proper pressure. A steel needle of a specific size is added to a model and used to define a size and location of the capillary tube. The minimum diameter of the capillary tube prepared can reach as small as 200 micrometers ,and the bonding strength can reach 5 MPa. According to the method, the operation of cryogenic surface activation bonding is simple, the requirement on the glass sheet surface roughness is low, and no clean room or expensive ultra-high vacuum plasma treatment device is required. The method overcomes the problems of the pipe collapse, the device superficial devitrification and the inner wall roughness that may be caused by the conventionally prepared capillary tubes. The capillary tube produced has the smooth inner wall, increases the viewable region of the sample in the capillary tube, and dramatically improves chip performance.

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 theinner 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 a design and manufacture technology of a sensing unit of a sensor and one or more types of sensor chips consisting of the sensing unit, in particular to one or more types of sensor chips capable of detecting the magnetic field parallel and vertical to the surface of the chip and the acceleration of an object. The invention has the advantages that the process is simple and easy, the sensitivity is high, and batched production is easily realized; the sensing unit of the sensor comprises a wafer substrate, a seed layer, a soft magnetic material layer, a conducting layer and a N-layer structure; the conducting layer is wrapped by the soft magnetic material layer; the N-layer structure is formed by combination of the soft magnetic material layer and the conducting layer; and simultaneously a bent structure is formed by N long lines in the plane (the sensing unit is a single-strip-shaped structure when N is equal to 1). The sensing unit of the sensor realizes single-axis, double-axis and three-axis magnetic field detection by different packaging forms. Simultaneously, due to the combination of the sensing unit of the sensor and a cantilever structure with magnetic mass blocks, the single-axis, double-axis and three-axis acceleration detection can be realized.

The invention discloses a method for forming thin-walled parts through stamping and drawing, which is used for reducing the thicknesses (0.4-2mm) of raw materials to 50-100% of the original thicknesses the raw materials; the raw materials comprise magnesium alloys, aluminum alloys, titanium alloys, high temperature alloys and complex splice-welded plates; and the method specifically comprises the following steps that: a flexible forming technique is adopted with the aid of moulds and a hydraulic machine, wherein the moulds are in concave-convex fit with the hydraulic machine; upper and lower blank holders and concave and convex moulds are respectively subjected to hydraulic pressure exertion control; the nominal pressure of a main hydraulic cylinder exerted on the concave and convex moulds is 25000-4500 KN, and the nominal pressure of a side-pressing hydraulic cylinder accounts for 50-67% of the nominal pressure of the main hydraulic cylinder; and the maximum operating pressure of a liquid chamber is 150MPa. By using the method disclosed by the invention, an expected effect is obtained, and the qualification rates and efficiencies of parts are obviously improved; and meanwhile, the hydroforming technology fills in the gaps in industry application, and lays a solid foundation for the thorough solving of technical bottlenecks existing in actuating cylinder cover forming and the research and preparation of future novel thin-wall parts and sheet metal forming parts.

The invention discloses a method for removing visual gaps among modules after a display screen is spliced and a display method, and belongs to the field of display screens. The method comprises the steps of S1, obtaining a brightness distribution picture when the display screen is lightened; S2, determining the positions and gap positions of all light points on the brightness distribution picture;S3, calculating to obtain brightness compensation coefficients of the light points at the two sides of each gap and inside each module or all the light points according to the local average brightness difference of the gaps or the non-gaps, or according to the distance of adjacent light points at the two sides of each gap and the distance difference of adjacent light points inside each module; S4, using the brightness compensation coefficients to adjust the brightness of the light points at the two sides of each gap and inside each module or all the light points to visually remove the visualgaps among the modules after the display screen is spliced. Bright and dark lines in gaps among display units of the spliced display screen are visually removed, the visual effect is obviously improved, the achievement steps are simple, and the splicing and installation difficulty and installation cost are lowered.

The invention relates to a subassembly (1) and a method for the production thereof. Said subassembly (1) comprises a first and a second part (2, 3), the first (2, 3) of which is cold-formed. Said parts (2, 3) are provided with parallel planar pieces (20, 21) and contact areas that extend at an angle therefrom in order to place the two parts (2, 3) against each other without leaving a gap therebetween while being joined to each other at the butt joint (16) via a welded seam (17) created by means of beam welding. The planar pieces (20, 21) are disposed so as to be misaligned relative to each other by an offset (19). One of the parts (2, 3) is provided with a contacting projection (6) which embodies the contact area of the first part (2). The parts (2, 3) are positioned relative to each other in such a way that the second part (3) forms the butt joint (16) along with the first part (2) in the section of the first part (2) in which an offset thickness of the basic material is smaller than the offset thickness of the structure in a deformation zone (18) created on the first part (2) by cold forming.

The invention discloses a double-tower hybrid beam cable-stayed bridge system. The double-tower hybrid beam cable-stayed bridge system comprises a hybrid beam composed of a concrete beam and a composite beam. The concrete beam and the composite beam are connected through a joint section. The concrete beam is a bilateral ribbed beam and comprises two concrete beam ribs. The composite beam comprises two main steel beams, and the main steel beams are each of an I shape and each comprise a main steel beam top plate, a main steel beam bottom plate and a main beam steel web. The joint section comprises a concrete beam rib-main steel beam connection structure composed of a front pressure bearing plate, a rear pressure bearing plate and a joint section steel web, and the main steel beam top plates and the main steel beam bottom plates stretch into the concrete beam ribs. The double-tower hybrid beam cable-stayed bridge system is reasonable in structural design, convenient to construct, high in construction speed, good in use effect and good in connection effect of a steel-concrete joint part. Meanwhile, the invention further discloses a construction method of the double-tower hybrid beam cable-stayed bridge system. The construction method includes the steps of lower portion supporting structure and main tower construction and hybrid beam construction. The construction method is simple, easy to implement, short in construction period and good in construction effect.

The invention discloses an air dielectric cylindrical lens antenna. The air dielectric cylindrical lens antenna comprises a metal disc-shaped parallel plate waveguide, a feed source antenna and arc-shaped metal support plates, wherein the metal disc-shaped parallel plate waveguide comprises an upper metal disc and a lower metal disc, the upper and the lower inner surfaces of the metal disc-shaped parallel plate waveguide are planes or arc-shaped surfaces, a central cavity of the metal disc-shaped parallel plate waveguide forms an air dielectric cylindrical lens, an annular boss is arranged below the edge of the upper disc of the metal disc-shaped parallel plate waveguide, the annular boss is arranged above the edge of the lower disc of the metal disc-shaped parallel plate waveguide, the feed source antenna is arranged between the two annular bosses, the feed source antenna is embedded in an arc-shaped groove between the arc-shaped metal support plates on the edges of the two metal discs, and the arc-shaped metal support plates are connected with the two metal discs through screws. The feed source antenna is a horizontal polarization gradient groove antenna or a horizontal polarization gradient groove antenna array.

The invention discloses an underground stope artificial pillar expansion jacking device mounted between an artificial pillar foundation and a stope top plate. The underground stope artificial pillar expansion jacking device comprises an upper cover barrel, an inner sleeve and a lower cover barrel; the inner sleeve is positioned between the upper cover barrel and the lower cover barrel; the upper cover barrel has a barrel bottom I and a barrel wall I; the lower cover barrel has a barrel bottom II and a barrel wall II; the upper cover barrel is arranged above the inner sleeve; the outer wall of the inner sleeve is in clearance fit with the inner wall of the barrel wall I; the lower cover barrel covers the lower side of the inner sleeve; the outer wall of the inner sleeve is in clearance fit with the inner wall of the barrel wall II; a gravel cushion layer and an expansion agent cartridge are arranged in the inner sleeve from bottom to top in sequence; and gravels fill the expansion agent cartridge; and water drainage exhaust holes are respectively formed in the barrel bottom I and the barrel bottom II. The underground stope artificial pillar expansion jacking device has such advantages as simple structure, low production cost, convenience for use, capability of quickly and actively jacking, good jacking effect and high support force.

The invention discloses a sliding-plate parallel clamping auto tire carrier which comprises at least two mutually connected chassis, wherein traveling mechanisms and positioning devices are arranged on the chassis; a clamping mechanism is arranged on each chassis and comprises a pair of sliding plates and a sliding plate driving mechanism, and the sliding plates are connected with the chassis in a sliding way; clamping arms are movably connected with the sliding plates; and a left guiding groove plate and a right guiding groove plate are fixed on each chassis. Through the interaction and cooperation of the sliding plates, L-shaped guiding grooves in the guiding groove plates and the clamping arms, the siding plates perform linear motion under the guidance of the L-shaped guiding grooves so as to force the clamping arms to perform rotary and linear motion, so that the rotating, unfolding and folding motion of the clamping arms is realized, and then the effect that working arms parallelly clamp tires to carry an auto is realized through the linear motion; a clamping arm driving motor is omitted, the system structure is simplified, and the reliability is improved; the clamping arms parallelly and oppositely push the clamped tires so as to avoid damaging the auto; and meanwhile, the sliding-plate parallel clamping auto tire carrier is simple in structure, convenient to mount, low in cost and high in reliability.

The invention discloses a middle hole pressure storage static leakage-free oil sprayer, comprising a high speed solenoid valve, a locking screw sleeve, a tapered surface ball valve type switch valve, a control plunger and barrel assembly, an oil sprayer spring, a spring seat, an opening check ring, an oil sprayer body, an oil sprayer assembly and an oil nozzle locking cap; the tapered surface ball valve type switch valve is arranged in a concave cavity in the upper end of the oil sprayer body; the upper end of the oil sprayer body is connected with the high speed solenoid valve by a locking nut; the lower end of the oil sprayer body is connected with the oil nozzle assembly by the oil nozzle locking cap; the control pole plunger and barrel assembly is arranged in a central hole formed along the axis of the oil sprayer body; the central hole of the oil sprayer body and the control pole plunger and barrel assembly form a middle hole pressure storage cavity. The oil sprayer is simple in structure, low in machining cost and convenient to mount, so the production efficiency and product percent of pass are improved.

The invention discloses a cylindrical workpiece end flat-milling and clamping device which comprises a bottom plate, a V-shaped groove sizing block, a V-shaped groove pressure head, a driving threaded rod and a positioning block. A first vertical plate and a second vertical plate are fixedly arranged on the upper side of the bottom plate. The V-shaped groove sizing block is fixedly arranged on one side of the first vertical plate. The driving threaded rod is arranged on the second vertical plate. The V-shaped groove pressure head is hinged to one end of the driving threaded rod. A circular handle is fixedly mounted at the other end of the driving threaded rod. The positioning block and a support are fixedly arranged on the upper side of the bottom plate and located between the V-shaped groove sizing block and the V-shaped groove pressure head. A pressing shaft used for rapidly and tightly pressing a workpiece is mounted in an unthreaded hole in the middle of the support in a sliding mode. An elastic element is arranged between the end of the pressing shaft and the support. The cylindrical workpiece end flat-milling and clamping device has the following characteristics of quick positioning, good positioning accuracy, high machining precision, reasonable design, simple structure and convenient clamping.