33results about How to "Reduce eccentricity error" patented technology

The invention relates to a large field of view camera calibration method based on a precision two-axis turntable and a laser tracker. The large field of view camera calibration method is characterizedin that the precision two-axis turntable and a laser tracker target ball perform a rotary motion together, and a conversion matrix from a tracker coordinate system to a turntable coordinate system issolved; an optical reflection ball is used as an optical reference point of the camera calibration and is fixed in front of the turntable; a position of an optical reflection ball center is established in the turntable coordinate system through precise exchange between the optical reflection ball and the tracker target ball and tracker measurement; the camera and the turntable perform two-dimensional rotation together to shoot the optical reference point and simultaneously record an angle value of each stand position, and a virtual calibration control field is established; an elliptical contour of the reflection ball in the image is fitted to calculate an image position of a calibration target center; and a minimum objective function is established on the basis of a camera imaging model to perform camera calibration. The invention is suitable for completing high-precision camera internal reference calibration in a large field of view environment, and is particularly suitable for occasions where change of the camera measurement depth is large and the traditional calibration target is difficult to design and manufacture.

The invention discloses a center-adjustable ball spherical hinge joint and a center adjusting method of the center-adjustable ball spherical hinge joint. Due to machining and assembling errors, a spherical hinge joint is in an eccentric state usually. Supporting ball guide holes are formed in a supporting ball socket of the ball spherical hinge joint. A displacement sensor is installed in a sensor installation hole of the supporting ball socket. Restraining ball guide holes are formed in a restraining ball socket. Double-thread center adjusting mechanisms are installed in the supporting ball guide holes and the restraining ball guide holes to adjust ball steel balls. The center adjusting method includes the steps that the center-adjustable ball spherical hinge joint is installed; when the double-thread center adjusting mechanisms are installed, main threaded columns and auxiliary threaded columns rotate in the opposite directions, and the restraining ball steel balls and the supporting ball steel balls are quickly located; and when centering adjustment is conducted by the double-thread center adjusting mechanisms, the main threaded columns and the auxiliary threaded columns rotate in the same direction. The double-thread structures rotate in the opposite directions when the eccentric error is relatively large, and the eccentric error is quickly reduced; and the double-thread structures rotate in the same direction when the eccentric error is relatively small, and the centering condition of the balls and the ball sockets are finely adjusted.

The present invention discloses a space curve type long-distance microfine pipe internal surface form measurement instrument and its detection method. Said pipe internal surface form measurement instrument is formed from the components of 2-D position sensor, semiconductor laser, transparent window, micromotor, scanning lens, reflector, convergent lens and receiving lens group, etc. Said measurement instrument is applicable to defect detection and 3-D measurement of curve type microfine pipe internal wall whose inner diameter is 9-11 mm and curvature radius is greater than 100 mm, and its measuring accuracy can be up to plus or minus 0.1 mm.

The invention discloses an outer diameter measuring device and method for a thin-wall bearing ring. The device comprises a supporting frame, a workbench arranged on the supporting frame, a positioningmechanism arranged on the workbench, a measuring mechanism and a reverse abutting mechanism. The workbench is provided with a measuring center, and the positioning mechanism comprises a Y-axis positioning mechanism and an X-axis positioning mechanism which are arranged on the workbench; the measuring mechanism comprises a torsion spring comparator arranged on the workbench in a sliding mode and ameasuring adjusting mechanism used for adjusting the torsion spring comparator to move on the workbench in the Y-axis direction. The reverse abutting mechanism comprises a reverse abutting rod arranged between a Y-axis positioning rod and a measuring head of the torsional spring comparator and a reverse abutting adjusting mechanism used for adjusting the reverse abutting rod to move along a Y-axis guide groove. According to the device, when the torsional spring comparator is used for measuring the bearing ring, force measurement errors and eccentric errors of the thin-wall bearing ring in themeasurement process can be reduced, and therefore the outer diameter measurement precision of the thin-wall bearing ring is improved.

The embodiment of the invention discloses a method for reducing drive eccentric errors of a harmonic gear and an automatic aligning wave generator. The automatic aligning wave generator comprises a turn plate driven by an input shaft and an elastic floating mechanism provided with two rollers. The elastic floating mechanism is flexibly arranged inside the turn plate in a sliding manner in the long axis direction of the automatic aligning wave generator. The elastic floating mechanism comprises two roller brackets symmetrically distributed relatively to the centre of the turn plate and an elastic element arranged between the roller brackets; the elastic element elastically resists against the two roller brackets, and the two rollers are respectively arranged on the two roller brackets, elastically resist against an inner circle of a flexible gear under the action of the elastic element and force the flexible gear to form an ellipse from a round shape, so that gear teeth of the flexible gear are tightly meshed with gear teeth of a rigid gear. The automatic aligning wave generator can reduce the eccentric errors caused by processing and assembling of parts, can remove the gear backlash between the gear teeth of the flexible gear and the gear teeth of the rigid gear and play an overload protection role.

A digital aerial surveying colorful camera lens is characterized by comprising a front set of lenses, a light diaphragm and a rear set of lenses, and all lenses are deposited on the same one optical axis in order; the front set of lenses are composed of a first spherical shell lens, a second spherical shell lens, a third spherical shell lens, a first double cemented lens and a double convex lens; the rear set of lenses are composed of a triple cemented lens, a second double cemented lens and a fourth spherical shell lens. The digital aerial surveying colorful camera lens of the invention solves the problem that the high resolution and the low distortion are difficult to implement under the large visual field. When the visual field is 87. 8 degrees, on the 55 line pair, MTF>=0. 4, the full visual field distortion is less than 0. 01, and the structure is compact, the miniaturisation and the light weighing can be implemented.

The invention relates to a ship shafting torque measuring probe in an eccentric error correcting mode. The ship shafting torque measuring probe in the eccentric error correcting mode is mainly composed of a photoelectric receiving module (4), an eddy current displacement sensor (5), a photoelectric diode (3), a semiconductor laser (2), a laser clamping block (1) and a middle block (6), wherein the laser clamping block (1) and the middle block (6) are arranged on a base (7). The laser clamping block (1) is provided with through holes which are used for containing and fixing the semiconductor laser (2), and the photoelectric receiving module (4) is fixed to the middle block (6) and serves as an upholder of the photoelectric diode (3). The middle block (6) is used for clamping a connecting leading wire of the eddy current displacement sensor (5) and the photoelectric diode (3). According to the ship shafting torque measuring probe in the eccentric error correcting mode, an optimization design is adopted overall, space is saved, and the torsion phase angle deviation caused by code disc eccentric errors is eliminated. Meanwhile, the invention further provides two methods for obtaining an initial phase angle.

The invention discloses a pose measuring plate and a method for automatically operating a universal centrifuge through a mechanical arm, and the method comprises the steps: fixedly installing the pose measuring plate with three labels on a rotor of the universal centrifuge to be measured, measuring the pose of the rotor of the universal centrifuge, determining a rotation angle, and determining which interval the rotor is located in; and according to the relation between the position and posture of the rotor of the universal centrifugal machine calibrated in advance in each interval and the relative position and posture of each centrifugal hole, the position and posture of the centrifugal hole are calculated, and the position and posture of the tail end of the mechanical arm are obtained according to the position and posture of the centrifugal hole. And the mechanical arm completes automatic operation of taking and placing the container to be centrifuged from the centrifugal hole of the rotor of the general centrifugal machine according to the tail end pose of the mechanical arm. The method is suitable for the mechanical arm to operate most centrifugal machines, hardware transformation does not need to be carried out on the interiors of the centrifugal machines, the stopping positions of the rotors before and after centrifugation do not need to be changed, and the method can be universally used for automatic operation of the mechanical arm on the universal centrifugal machines.

The invention discloses a turning clamp of a cast iron oil distribution disc. The turning clamp comprises a positioning seat, a pointed end seat and a pressure block, wherein the positioning seat is arranged on a three-jaw chuck of a main shaft of turning equipment and is used for supporting the large end surface of the cast iron oil distribution disc; the end part of the positioning seat is provided with a positioning assembly, and the positioning assembly corresponds to the position of a flow distribution window of the cast iron oil distribution disc; one end of the pointed end seat is connected with a tailstock of the turning equipment and is matched with the tailstock to carry out positioning and pressing on the cast iron oil distribution disc; and the pressure block is connected with the pointed end seat through a rotary component and is used for pressing the small end surface of the cast iron oil distribution disc. According to the turning clamp, the positioning seat is arranged, the positioning assembly is arranged on the positioning seat, the positioning assembly is used for aligning the flow distribution window of the cast iron oil distribution disc, positioning and clamping of the cast iron oil distribution disc are realized, compared with a clamping mode of a three-jaw clamping outer circle in the prior art, the position precision and the coaxiality precision of the cast iron oil distribution disc are greatly improved.

The invention relates to an iterative camera calibration method based on an ellipse dual quadratic curve. The method comprises the following steps: extracting ellipse circle center coordinates on a calibration plate image; calibrating the camera according to the two-dimensional pixel coordinates and the three-dimensional space coordinates corresponding to the ellipse circle center coordinates, and solving to obtain camera parameters and a first projection error; correcting perspective projection and lens distortion in the calibration plate image, and converting the calibration plate image to a forward view; extracting circle center coordinates of a perfect circle on the corrected calibration plate image; re-projecting the perfect circle center coordinate back to the camera coordinate system, re-calibrating the camera according to the coordinate of the perfect circle center coordinate in the camera coordinate system, and solving to obtain a second re-projection error; and carrying out convergence judgment according to the first projection error and the second projection error. According to the iterative camera calibration method based on the elliptic dual quadratic curve, the re-projection error can be reduced by 92.4%, and the calibration precision of the camera is greatly improved.

The invention belongs to the technical field of traffic transportation and building test equipment. The invention relates to a laboratory self-control pile sinking device. A hydraulic oil cylinder isconnected with a high-pressure oil pump and a loading controller serving as a controller to form the pile sinking device. When pile sinking is automatically controlled in a laboratory, a counter-forceframe is used as a supporting system for automatically controlling pile sinking; a gear and a rack are driven by a motor to perform lifting control of the laboratory self-control pile sinking device;a miniature laser displacement meter monitors the positions of the pile sinking device and a pile body and the perpendicularity condition of the pile body in a laboratory; and a leveling rod is usedfor monitoring the perpendicularity of the pile body during initial pile sinking, and the miniature laser displacement meter and the leveling rod are used for monitoring the perpendicularity of the pile body at the same time. Therefore, the perpendicularity of the pile body is guaranteed, a pipe pile can be conveniently, rapidly and accurately sunk to a designated position, and a laboratory modelpipe pile test is successfully completed.