32results about How to "Good accuracy and stability" patented technology

The subject of the invention is to inhibit the reduction in appearance quality and uniformity by inhibiting folds stacking on the two end portions of tread rubber caused by downward press fit, thus providing a method for manufacturing a raw tyre for an automatic bicycle. In the manufacturing method, a tread tube forming process comprises: a tread rubber coiling step of forming cylindrical tread rubber on a rubber-made cylindrical tread forming drum which is expandable into a drum shape through the filling of internal pressure; a tread rubber bending step of, by employing a conveying ring with an inner peripheral surface as a circular-arc-shaped surface approximate to the tread, pushing the tread rubber to the inner peripheral surface of the conveying ring through the expansion of the tread forming drum formed through the filling of internal pressure, thereby bending the cylindrical shape of the tread rubber into a convex circular-arc shape; and a belt forming step of, in the circumferential direction of the tyre, forming a belt by spirally attaching a belt-like cord, formed by dispensing glue to a cord thread, to the inner peripheral surface of the tread rubber retained on the conveying ring.

The invention relates to a multi-inertial-navigation redundant system initial structure optimization method based on zero-speed correction. Static simulation is carried out before the inertial navigation system works, and the precision of the inertial navigation system is evaluated by analyzing static output data of the inertial navigation system. The method comprises the following steps: (1) carrying out filtering calculation on a navigation system by utilizing Kalman filtering to obtain an error estimation value, and synthesizing a basic navigation parameter error equation of the strapdown inertial navigation system and an error equation of an inertial instrument to obtain a state equation of the integrated navigation system; 2) combining the output quantity of the navigation system withan error state equation of the system, and giving a measurement equation by adopting a position and speed combination mode in zero-speed correction; 3) setting a device noise model, initial parameters, a sampling period and an updating period, setting initial parameters of a filter, and carrying out zero-speed correction on the two sets of equal-precision inertial navigation systems under a static condition, and 4) comparing the two sets of inertial navigation systems after zero-speed correction to obtain the inertial navigation system with better precision performance.

The invention discloses a moving post double-side ram lathe body milling machine, which comprises a work bench base mounted to a ground foundation, left and right upright posts arranged at the left and right sides of the work bench base, left and right lifting slide seats arranged on the left and right upright posts, left and right rams arranged on the left and right lifting slide seats, left and right main shafts mounted to front ends of the left and right rams, and left and right mill heads mounted to the left and right main shafts, wherein the left and right upright posts are respectively mounted in position through left and right longitudinal orientation guide rails and left and right longitudinal auxiliary guide rails; the left and right longitudinal orientation guide rails are arranged on two steps inwardly formed on the left and right side faces of the work bench base in a manner of being higher in the front position and lower in the back position; and the left and right longitudinal auxiliary guide rails are mounted on the ground foundation and do not need limiting in the horizontal direction. By adopting the moving post double-side ram lathe body milling machine provided by the invention, the support span of the double upright posts can be increased to obtain higher support stability and effectively prevent disturbing moment produced by forward tilting of the gravity center of the upright posts due to forward movement of the rams.

The invention relates to a capacitance type MEMS (micro-electro-mechanical system) gas sensor. The capacitance type MEMS gas sensor is particularly suitable for coal mine safety monitoring as well asdetection on methane gas in the air in production and living, can be applied to detection on the gases such as helium, carbon dioxide and argon in special environments, and comprises a thermal actuator and two comb capacitors, wherein the thermal actuator comprises a plurality pairs of silicon beams, a micro-spindle and an anchor area; and each group of comb capacitor comprises a movable comb, onegroup of folding structure spring, a fixed comb and an anchor area. The sensor can detect the concentration of the methane gas, adopts thermal deformation of the silicon beams to drive the capacitance change of the comb capacitors according to the principle that the resistance of a semiconductor material is changed along with the change of the methane content of the peripheral gas under a certaincurrent, and measures the methane concentration of the air according to the capacitance change. The capacitance type MEMS gas sensor has the following advantages of simple structure, high adaptability, no poisoning influence, no abrasion and no inertness due to capacitance type measurement, high temperature and precision stability, high electromagnetic interference resistance and high dynamic response speed.

The invention provides a composite honeycomb sandwich structure for an oversized high-precision single-curved reflection panel. The composite honeycomb sandwich structure comprises three layers of hard aluminum plates, two layers of aluminum honeycomb cores and a sectional material framework for connecting and supporting. A total realization process comprises determination of a panel partitioningscheme, splicing of the three layers of hard aluminum plates, determination of a slotting scheme, calculation of shielding, unfolding of the panel, calculation of nailing height, positioning of the three layers of hard aluminum plates, the panel and the sectional material framework on a high-precision nailing bed, production of a working plate solid mold, pre-stretching and molding of the sectional material framework, notching of the honeycomb cores, adjustment of the nailing bed, layer-by-layer pavement of the sandwich structure and cementing and formation under vacuum negative pressure. Thecomposite honeycomb sandwich structure is applied to engineering, and the formation rigidity and profile precision stability of the oversized high-precision single-curved reflection panel can be effectively improved; a production target of an oversized and single-curvature high-precision, large-rigidity and light-weight reflection panel applicable to a column surface near field is realized.

The invention discloses a high-stability step gauge and a preparation method thereof, wherein the step gauge is provided with a base body; the base body comprises a pillar carrier arranged along one coordinate direction; gauge block installing blocks are distributed and configured on the pillar carrier, and measuring pieces are fixedly installed on the gauge block installing pieces. The high-stability step gauge is good in precision stability, small in dimension and powerful in function; through reasonable combination of the base body and the gauge block installing blocks, the shape change bias of the step gauge caused by self-weight of the base body and other factors is effectively and significantly reduced; material use and step gauge weight are reduced according to the minimized design of the base body specification; thus the high-stability and high-precision calibration entity are provided. Through taking a cylindrical rigid supporting body as the base body, the preparation provides the stable and low shape change performance on length direction; the suit gauge block installing blocks are high in stability of fixedly installation, and accurate in positioning assembly of the measuring pieces.

The invention belongs to the technical field of measurement, and particularly relates to a device for measuring magnetostriction in a dual-channel capacitance method and a method thereof. The device comprises a sample position and probe position adjusting mechanism (1), external magnetic fields (18) at the two ends of the sample position and probe position adjusting mechanism (1) and a displacement data processing system (2) with a first electrical box channel (11) and a second electrical box channel (12). In accordance with the principle of a parallel plate capacitor, the amount of extension or contraction of a sample is measured indirectly via measuring changes in the capacitance between a movable sample electrode formed by two groups of samples (14) and a fixed electrode formed by probe electrodes (8-1 and 8-2) in the external magnetic fields, and thus the measurement of magnetostriction is completed and is displayed via dual channels. The device for measuring the magnetostriction in the dual-channel capacitance method has the advantages of simple structural design, high accuracy of measurement and high reliability.

The invention discloses an automatic tool setting method for a straight-edged tool. A laser tool setting instrument is used to perform automatic tool setting on the straight-edged tool fixedly connected to a machine tool spindle, wherein the automatic tool setting is divided into multiple steps and sequentially performed. For tool setting, in each step of tool setting, first move back and forth in the direction perpendicular to the laser beam of the laser tool setting instrument to determine the coordinate position of the tool tip point of the straight edge type tool, and then rotate the straight edge forward and reverse in turn. type tool to determine the zero angle of the straight edge type tool. The invention can realize automatic and high-precision tool setting, correct the starting angle of the straight blade type tool, ensure the smooth progress of subsequent cutting processing, reduce the time cost of manual tool setting, and improve the efficiency and tool setting accuracy.

The invention discloses an automatic tool setting method for a straight-edge type tool. A laser tool setting gauge is adopted for carrying out automatic tool setting on the straight-edge type tool fixedly connected to a machine tool spindle, wherein automatic tool setting is divided into multiple steps for carrying out tool setting in sequence, during tool setting of each step, the laser tool setting gauge moves back and forth in the direction perpendicular to a laser beam of the laser tool setting gauge so as to determine the coordinate position of a tool tip point of the straight-edge type tool, and then the straight-edge type tool is rotated forwards and backwards in sequence so as to determine the zero position angle of the straight-edge type tool. According to the automatic tool setting method, automatic and high-precision tool setting can be achieved, the starting angle of the straight-edge type tool is corrected, subsequent cutting machining is carried out smoothly, the time cost of manual tool setting is reduced, and the efficiency and the tool setting precision are improved.

The invention discloses a composite system capable of realizing micro-zone melting and finish machining of metal powder. The composite system is characterized by being formed by compounding an optical fiber laser galvanometer scanning mechanism and a laser engraving mechanism, wherein the optical fiber laser galvanometer scanning mechanism is provided with an XY worktable; a laser engraving head of the laser engraving mechanism is arranged on a Y axis of the XY worktable; after a plurality of forms are formed on a workpiece, the XY worktable controlled by slicing software drives the laser engraving head to perform laser engraving on the workpiece according to a path controlled by the slicing software. The composite system disclosed by the invention has the beneficial effects that after the optical fiber laser galvanometer scanning mechanism and the laser engraving mechanism are compounded, the optical fiber laser galvanometer scanning mechanism performs quick portioned scanning, and the laser engraving mechanism engraves the internal and external boundary lines in a material increase manufacturing process, and quick scanning and engraving are alternatively performed, so that the workpieces with accurate sizes can be obtained.

The invention discloses a wheel tracking tester automatic detection device which comprises a square base, a turbo-worm reducer, a hollow disc-shaped support part, a butterfly force value sensor and aplurality of linear temperature and humidity sensors, wherein a columnar groove is formed in the upper surface of the square base coaxially, a plurality of columnar guide pillars are uniformly arranged in the groove, close to the periphery; the turbo-worm reducer is fixedly arranged in the middle of the groove, an encoder is arranged at the center of the upper surface of the turbo-worm reducer; the hollow disc shaped support part is provided with columnar through holes matched with the guide pillars, is coaxial with the base and is sleeved on the guide pillars in a vertically moving way; the butterfly force value sensor is fixedly arranged above the encoder by a thread bushing; the lower ends of the linear temperature and humidity sensors are arranged at four opposite angles of the base. The invention also provides a control method of the wheel tracking tester automatic detection device, which adjusts trial wheel displacement and voltage of a detection circuit based on the BP neural network in wheel tracking tester automatic detection. According to the invention, integrated automatic detection is realized; and meanwhile, the accuracy of the test system in a common test environmentis increased.