69results about How to "Change precision" patented technology

The steel structure beam-column node member is composed of steel upright column and H-beam. The H-beam includes transverse beam and longitudinal beam, on the side surface of steel upright column a screw bolt hole is cut, the upper and lower two sides of said screw bolt hole are quipped with spacing bracket respectively, on the bracket a screw holt hole is cut, on the upper and lower flanges of transverse beam and longitudinal beam and web plate of transverse beam the screw holes are cut, and on the end portion of the transverse beam an end plate is welded, on the end plate a screw hole is cut, on the end portion of the longitudinal beam an ''U'' - shaped clamping hoop plate is welded, and on the clamping hoop plate a screw bolt hole also is cut.

The invention discloses a long-gauge fiber grating scour sensor, a manufacturing method thereof, and an installation and laying method thereof, and a scour monitoring system formed by the long-gauge fiber grating scour sensors. The long-gauge fiber grating scour sensor comprises an elastic straight rod and a long-gauge fiber grating sensing probe array that is integratedly packaged with the elastic straight rod; and the long-gauge fiber grating sensing probe array is at one side of the elastic straight rod. Besides, the long-gauge fiber grating sensing probe array includes a plurality of long-gauge fiber grating sensing probes that are successively in series connection. According to the invention, the scour principle is simple and reliable and the testing method is novel and ingenious; the manufacturing process of the sensor is simple and costs are relatively low; the sensor has good durability and good environment adaptability; testing precision is good and can reach 0.05m or even smaller, and the precision can be changed according to a concrete requirement; and there is no need to consider a temperature compensation problem, so that the test becomes simple and effective.

The invention discloses an automatic lifting rotating scanning device of a hydrophone. The automatic lifting rotating scanning device of the hydrophone comprises a rack, the rack is provided with a landing gear, a moving frame, a moving platform, a screw rod, a lifting table and a rotating spindle, the landing gear performs Z-direction lifting movement along the rack, the moving frame performs X-direction translational motion on the landing gear, the moving platform performs Y-direction translational motion on the moving frame, the screw rod is vertically installed on the moving platform, the lifting table is driven by the screw rod to perform lifting movement, the rotating spindle is vertically installed on the lifting table, the rotating spindle and the lifting table are rotatably matched with each other and axially fixed, and the bottom of the rotating spindle is used for suspending the hydrophone or a detected sample which is matched with the hydrophone. A driving mode of the screw rod and the rotating spindle includes that a screw rod driving step motor is mounted on the moving platform, the screw rod driving step motor drives the screw rod to rotate through a screw rod synchronous belt, a rotating sleeve and a step motor are arranged on the moving platform, the step motor drives the rotating sleeve to rotate, the step motor drives the rotating sleeve through a driving belt, and the rotating spindle penetrates the rotating sleeve and is circumferentially positioned and is in axial sliding fit with the rotating sleeve.

The invention provides a precision adjustable acceleration transducer. The precision adjustable acceleration transducer comprises a light shielding object, a transverse optical path and a vertical optical path. The transverse optical path and the vertical optical path are vertically intersected to form an optical surface, the transverse optical path and the vertical optical path each comprises more than two parallel equally-distanced optical paths, each optical path comprises a luminescence unit and a corresponding photosensitive unit, and each photosensitive unit is used for detecting the shielding condition of the each optical path and is used for transmitting acceleration data. The precision adjustable acceleration transducer is simple in structure and low in cost and can conveniently change the precision of the acceleration transducer.

Based on the silicon optical diode, the device can detect illuminance less than 10 to the power -8 Lx. The silicon optical diode and the magnetifier are installed in the electromagnetic shielding box. The output end of the magnetifier is connected to the input end of the voltage to frequency converter. The decimal data collector with at least 6 digits includes the collection counter, the collection register, the time base generator for the counting gate, the background counter, the background register as well as the OR gate and the full subtracter. The invention provides long-lasting steady work in bad environment, which does not affect the precision, long distance data transmissions well as mini type an low power consumption. The capabilities as of self-adapting and self-starting, satisfy the requirements of no-attendance.

The invention relates to a modularized array electrode of a precision simulate welded joint and a manufacturing method thereof. The modularized array electrode comprises three microelectrode modules: a base metal module, a welding heat affected zone module and a weld metal module, wherein the welding heat affected zone module is arranged between the base metal module and the weld metal module. According to the manufacturing method of the modularized array electrode of the precision simulate welded joint, sample preparations of a base metal zone, a welding heat affected zone, a fusion zone and a weld zone are conducted respectively, the base metal zone, the welding heat affected zone, the fusion zone and the weld zone are recombined and renatured according to the structure features of the welded joint, and therefore the array electrode is manufactured and obtained. The precision simulate welded joint is similar to an actual welded joint in structure and performance and is accurate in simulation and adjustable in area ratio. Through a modularized combination and manufacturing method, an individual test for a certain microelectrode in a certain module can be achieved, coupling tests and scan tests for a certain module or all the modules can be achieved, and the modularized array electrode is especially suitable for galvanic corrosion testing of a multielectrode system.

The invention discloses a lossless watermark method based on organization characters of vector geographic line data. The lossless watermark method comprises the following steps: watermark information generation, watermark information embedding and watermark information detecting. The organization characters of the vector geographic line data are utilized fully, and are combined with a robustness watermark technology, so that embedding and detecting of watermarks can be realized under the condition that data precision is not changed. Because watermark information is embedded in invariant of the vector geographic line data, the lossless watermark method can resist attack of almost all common types.

The invention discloses a double-station sheet cutting connecting rod fracture splitting groove device which comprises a platform, a left station machining device, a right station machining device, asecondary vertical driving device, a secondary horizontal driving device and a controller. The left station machining device and the right station machining device each comprises a clamp, a main horizontal driving device, a main vertical reciprocating driving device and a machining electrode assembly. Each machining electrode assembly comprises a connecting frame fixedly installed on the main vertical reciprocating driving device, a reel rotatably installed on the connecting frame, a sheet wound on the reel and clamping feet used for clamping the sheet, vertical through holes are formed in theclamping feet, and the sheets are sleeved with the vertical through holes and stretch out of the lower ends of the vertical through holes. The sheets are clamped and tensioned by the clamping feet todo continuous reciprocating motion in the vertical direction, meanwhile, the continuous reciprocating motion in the vertical direction and grooving machining in the horizontal direction form composite machining, continuous reciprocating in the vertical direction is auxiliary motion of grooving machining, and discharging and chip removal are facilitated.

The invention provides a planar three-degree-of-freedom parallel micro-positioning platform of a symmetric structure. The planar three-degree-of-freedom parallel micro-positioning platform comprises a movable worktable, a fixed platform body and three full-flexible supporting chains connected between the movable worktable and the fixed platform body. The planar three-degree-of-freedom parallel micro-positioning platform is characterized in that the three full-flexible supporting chains are symmetric with the geometrical axis of the movable worktable as the center, each full-flexible supporting chain comprises an elastic moving pair and an elastic folded beam shaped like a Chinese character 'gong', the side face, shaped like the Chinese character 'gong', of each elastic folded beam and the top face of the movable worktable are in the same plane, one end of each elastic folded beam shaped like the Chinese character 'gong' is connected with the movable worktable, the other end of each elastic folded beam shaped like the Chinese character 'gong' is connected with one side face of the corresponding elastic moving pair, the opposite side faces of each elastic moving pair are fixedly connected with the fixed platform body through a piezoelectric ceramic actuator, and the geometrical axes of the three piezoelectric ceramic actuators are in the same plane and do not intersect at one point. The planar three-degree-of-freedom parallel micro-positioning platform of the symmetric structure is made of a piece of a material, and the shortest kinematic chain is adopted, so that the platform has the advantages of being free of assembly errors, compact in structure, high in kinematic accuracy, large in bearing capacity and the like.

This invention provides a fluidic angular velocity sensor and its process and belongs to micro electron mechanical system design and its process field. The sensor comprises two vibration chambers; four commute chambers and one detection chamber. The gas in the vibration chamber is driven and recycled and each vibration chamber two sides are located with two commute chambers and the driven gas flows into the detection chamber through the commute chamber and the recycled gas always moves along one direction in the detection chamber. The said detection chamber is symmetrically located with two pieces of heat sensitive resistance wires, which is connected with a Wheatstone bridge. The said commute chamber is needle teeth flow diode, which is composed of several orderly distributed needle teeth block bar.

The invention discloses a jigging machine self-adaptive buoy device based on machine vision. The jigging machine self-adaptive buoy device based on machine vision comprises a machine vision instrument, an ash measuring instrument, a jigging machine discharging device, a control processor, a self-adaptive buoy counterweight device and a discharging impeller; the machine vision instrument and the ash measuring instrument are arranged in front of a feeding port of the jigging machine and are connected with the control processor respectively; the jigging machine discharging device is in charge ofsorting and discharging work of coal; the self-adaptive buoy counterweight device is connected with the control processor; the discharging impeller is arranged below a discharging port jigging machinesieve plate; and the control processor controls the rotating speed of the discharging impeller according to a heavy product bed thickness signal acquired by a counterweighted buoy to achieve a good sorting effect. The jigging machine self-adaptive buoy device based on machine vision automatically changes the counterweight of the buoy device by detecting parameters such as variety and density of the coal by the machine vision instrument and the ash measuring instrument so as to detect the thickness of the true bed adapting to different materials, is accurate and reliable, and saves manpower resource.

The invention provides a preparation method of a polyfluortetraethylene micro-porous film baseband, belonging to the chemical technical field, particularly relates to the processing technical field of micro-porous polyfluortetraethylene film. The invention comprises the processing steps that polyfluortetraethylene resin powder is mixed with solvent which is number 3 aviation kerosene and isoparaffin; the proportion for uniform mixing among the three ingredients of the polyfluortetraethylene, the number 3 aviation kerosene and the isoparaffin is 1: 0.1-0.15: 0.2-0.3 according to weight percentage; the mixture is statically arranged under the temperature environment of 40-65 DEG C, then dumped into a pre-pressing forming machine, uniformly and slowly pressed into polyfluortetraethylene material rods under the pressure of 50kg-180kg and sent to a thrust press; the mixture then sequentially enters all rollers with the temperature ranging from 30-180 DEG C; the uniformity and width of the thickness of the baseband are adjusted through a baseband uniformity automatic control system to generate the polyfluortetraethylene micro-porous film baseband which is coiled by a coiler. The finished product of the invention has high uniformity and improves the utilization ratio of finished product micro-porous film.

The invention relates to a method for processing a stepped nonlinear spiral groove of a 16PA6 injection pump plunger, which is characterized by comprising the following steps: (1), roughly processing the spiral groove on the 16PA6 injection pump plunger by a numerical control milling machine and reserving the working allowance of 0.05mm; (2), performing heat treatment to make the hardness of the spiral groove reach HRC58-62; (3), finely processing the spiral groove on the 16PA6 injection pump plunger to the required size by a numerical control grinder; and (4), grinding an excircle with phi 23mm by the numerical control grinder, and controlling the depth of the spiral groove of the plunger between 0.99 and 1.01mm. The processing method changes the phenomenon of poor precision and smooth finish because the prior numerical control milling machine directly processes the spiral groove, simultaneously eliminates the little deformation influence of quenching on the spiral groove of the plunger, and improves the efficiency of subsequent assembly work and oil tests.

The invention discloses a lifting type multi-layer clamp storage rack. The lifting type multi-layer clamp storage rack comprises a bottom plate, a top plate, a screw and multiple swivel sleeves which are arranged on the screw in a penetrating and sleeving manner and are in threaded connection with the screw. Each partition plate and the corresponding swivel sleeve are rotationally connected through the cooperation manner of an annular tenon and an annular groove. A clamp groove is formed in the outer circumferential face of the annular tenon of each swivel sleeve. Guide grooves are formed in each partition plate symmetrically about the axis of the screw. A clamp shaft is connected in each guide groove in a sliding manner, and a limiting block is arranged on the upper surface of each clamp shaft. A limiting hole is formed in the upper surface of each partition plate. A limiting rod is connected in each limiting hole in a sliding manner. The lower end of each limiting rod can stretch out of the corresponding limiting hole and can stop the limiting block on the corresponding clamp shaft, and therefore each clamp shaft can keep the state of being separating from the corresponding clamp groove. A thrust spring is arranged in the rear end of each guide groove, and each clamp shaft can keep the state of being clamped in the corresponding clamp groove. A pull mechanism is connected to the rear end of each clamp shaft and can pull the clamp shaft to slide. According to the lifting type multi-layer clamp storage rack, the partition plates can ascend and descend correspondingly and do not influence one another, and the distance between the partition plates can be adjusted according to the clamp height.

The invention provides a micro landslides prediction instrument. The micro landslides prediction instrument is characterized in that the change of surrounding rock and the development of fracture are continuously monitored through a resistance strain gauge, and the acceleration change characteristic of the surrounding rock instability is sensitively and effectively determined according to the acceleration change of the resistance value, so as to provide a forecast warning for landslides. According to the micro landslides prediction instrument, the landslides prediction technology which is simple, easy to be performed, small in cost, unattended and monitors all the times is provided, which can be applied to the prediction of landslides of underground engineering, safety pre-warning for earthquake proofing and emergency rescuing, and the collapsing prediction of mine, dangerous rock, side slope, dam and the like.

The invention relates to a shock insulation support mounting and positioning rack which comprises a mounting rack column. Upper trapezoidal strips are connected to tops on two sides of the mounting rack column, an upper assisted cross beam plate is in clamping and embedding connection to one side of each upper trapezoidal strip, a level bar is fixedly connected to the center of the top of the upper assisted cross beam plate, a damping slideway is arranged on one side of the level bar, a vertical level bar is fixedly connected to the surface of one side of the damping slideway, a positioning slide block is in clamping and embedding connection to an inner cavity of the damping slideway, a support bearing plate is fixedly connected to one side of the positioning slide block, lower trapezoidalstrips are connected to bottoms on two sides of the mounting rack column, and a lower assisted cross beam plate is in clamping and embedding connection to one side of each lower trapezoidal strip. The shock insulation support mounting and positioning rack is convenient to mount and detach, the demand on mounting terrain is reduced greatly, the labor intensity of staff is alleviated, the positioning precision of the mounted shock insulation support mounting and positioning rack is adjustable, the construction quality and the construction efficiency are improved, and the transferring and transporting portability and safety are enhanced.

The invention discloses a current testing device which comprises a sampling module, a gain adjusting module and an upper computer. The sampling module is used for collecting differential signals at the two ends of the sampling resistor and feeding back the differential signals to the gain adjusting module, and the gain adjusting module is used for determining sampling current according to the differential signals and feeding back the sampling current to the upper computer. The upper computer adjusts the gain of the gain adjusting module according to the sampling current so as to change the acquisition range of the current testing device. According to the current testing device disclosed by the invention, the sampling current is determined according to the differential signals at the two ends of the sampling resistor, and the gain is adjusted according to the sampling current, so that the acquisition range of the current testing device is changed, and meanwhile, the precision of the current testing device can be adjusted, so that the measurement precision corresponds to the acquisition range; under the condition that the current testing device is not replaced, accurate measurement of currents of different magnitudes can be ensured. The invention further discloses a current testing method and electronic equipment.

The invention relates to an electro-hydraulic valve control displacement module and a using method thereof. The electro-hydraulic valve control displacement module comprises a stepping motor, a transmission rod, a feedback connecting rod, a three-position three-way valve, a linear variable differential transformer, a differential cylinder and a differential cylinder sleeve. The stepping motor is in transmission connection with the transmission rod. The differential cylinder sleeve is fixedly connected with the differential cylinder. The top end of the feedback connecting rod is hinged to the three-position three-way valve, and the bottom end of the feedback connecting rod is hinged to the differential cylinder sleeve. The two sides of the feedback connecting rod are hinged to the transmission rod and the linear variable differential transformer respectively. By means of the linear variable differential transformer and the feedback connecting rod, motion information of the stepping motor and the differential cylinder is fed back to a single-chip microcomputer in real time, by means of accurate calculation of the single-chip microcomputer, the displacement relation between the stepping motor and the differential cylinder can be accurately controlled, an operator can control the displacement relation conveniently and accurately, and therefore accurate adjustment is achieved.