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5224results about "Electrical/magnetic solid deformation measurement" patented technology

Power wrench

PCT No. PCT / EP97 / 05974 Sec. 371 Date Jul. 16, 1999 Sec. 102(e) Date Jul. 16, 1999 PCT Filed Oct. 29, 1997 PCT Pub. No. WO98 / 22263 PCT Pub. Date May 28, 1998A power screwdriver has a drive unit and an input circuit for inputting screw size, material quality, pitch, and clamping length of a screw. An evaluation circuit is provided for determining a nominal prestress force based on input screw size, material quality, and clamping length, for determining a nominal torque based on the nominal prestress force and the pitch, and for determining the screw clamping angle resulting from the nominal prestress force and the pitch. A sensing device for sensing the actual torque is provided, and a further sensing device for sensing the actual screw clamping angle is present. A control and switch-off device controls further rotation of the drive unit when the actual torque coincides with the nominal torque and switches off the drive unit when the actual screw clamping angle coincides with the nominal screw clamping angle. The nominal torque, based on which the additional rotation o f the drive unit is controlled until the nominal screw clamping angle is reached, is set to a value which is smaller than the torque corresponding to the nominal pretension force. An additional rotation angle of the drive unit, for reaching the nominal screw clamping angle corresponding to the nominal prestress force, is determined based on the difference between the nominal screw clamping angle and the adjusted screw clamping angle corresponding to the preset nominal torque and is used for switching off the drive unit.
Owner:HOHMANN JORG +1

Lateral deviation full-bridge double-interdigital metal strain gauge capable of measuring surface strain lateral partial derivatives

InactiveCN105004262AEfficient detection of surface strain lateral first orderEfficient detection of second order partial derivativesElectrical/magnetic solid deformation measurementElectrical resistance and conductanceFull bridge
The invention relates to a lateral deviation full-bridge double-interdigital metal strain gauge capable of measuring surface strain lateral partial derivatives, which comprises a base and four sensitive grids, and is characterized in that both ends of each sensitive grid are respectively connected to an outgoing line, each sensitive grid comprises a sensitive section and a transition section, and axes of the sensitive sections are straight lines and parallelly arranged in the same plane; in the plane determined by the axes of the sensitive sections, the axis direction of the sensitive sections is an axial direction, and the direction perpendicular to the axial direction is a lateral direction; the four sensitive grids are consistent in resistance, the resistance variation amount is consistent under the same strain, the four sensitive grids are called as an upper-upper sensitive grid, an upper-lower sensitive grid, a lower-upper sensitive grid and a lower-lower sensitive grid from top to bottom along the lateral direction, the upper-upper sensitive grid and the upper-lower sensitive grid are arranged in an interdigital mode, and the lower-upper sensitive grid and the lower-lower sensitive grid are also arranged in the interdigital mode; and centers of the four sensitive grids have no deviation in the axial direction and have deviation in the lateral direction. The lateral deviation full-bridge double-interdigital metal strain gauge not only can measure the strain, but also can effectively detect a lateral first-order derivative and a lateral second-order derivative of the surface strain.
Owner:山东尔湾海洋智能科技有限公司

Axial deviation double-sensitive grid interdigital metal strain plate capable of measuring axial deviation of surface strain

ActiveCN105091731AEffective detection of axial partial derivatives of surface strainElectrical/magnetic solid deformation measurementElectrical resistance and conductanceStrain gauge
The invention discloses an axial deviation double-sensitive grid interdigital metal strain plate capable of measuring axial deviation of surface strain. The metal strain plate comprises a substrate and two sensitive grids, wherein two ends of each sensitive grid are respectively connected with a leading-out line, the two sensitive grids are fixed on the substrate, each sensitive grid comprises a sensitive section and a transition section, and the axes of all the sensitive sections are linear, parallel and within the same plane; the direction perpendicular to the axial direction which is the direction of the axes of the sensitive sections in the plane determined by the axes of the sensitive sections is a transverse direction; the two sensitive grids are consistent in resistance variation under the same strain, and are respectively a left sensitive grid and a right sensitive grid in the axial direction from left to right; and on the plane determined by the axes of the sensitive sections, the left sensitive grid and the right sensitive grid are arranged in an interdigital mode. The metal strain plate can be used for measuring strain and effectively detecting axial first-order deviation of the surface strain.
Owner:江苏明泰工程机械制造研究院有限公司

Axial deviation full-bridge full-interdigital metal strain sheet capable of measuring surface strain axial partial derivative

ActiveCN105066871AEffective detection of surface strain axial first orderEfficient detection of second order partial derivativesElectrical/magnetic solid deformation measurementElectrical resistance and conductanceFull bridge
The invention provides an axial deviation full-bridge full-interdigital metal strain sheet capable of measuring a surface strain axial partial derivative. The axial deviation full-bridge full-interdigital metal strain sheet comprises a substrate and four sensitive gates. The two ends of each sensitive gate are respectively connected with a lead-out line. Each sensitive gate comprises a sensitive segment and a transition segment. The axes of all the sensitive segments are straight lines which are arranged in the same plane in parallel. Direction along the axes of the sensitive segments is an axial direction, and direction perpendicular to the axial direction is a transverse direction. The four sensitive gates are consistent in resistance and consistent in resistance variation under the same strain. The centers of the four sensitive gates are arranged in the same straight line which is parallel to the axis of any sensitive segment of the four sensitive gates. The four sensitive gates are respectively called a left sensitive gate, an intermediate left sensitive gate, an intermediate right sensitive gate and a right sensitive gate from left to right along the direction of the straight line. The centers of the four sensitive gates have deviation in the axial direction and have no deviation in the transverse direction. Any two sensitive gates are arranged in an interdigital mode. Strain can be measured and the surface strain axial first-order and second-order partial derivatives can be effectively detected further.
Owner:范建红
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