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1547results about "Measurement of torque/twisting force while tightening" 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

Test bed for testing friction torque property of double ball screws

The invention discloses a test bed for testing friction torque property of double ball screws, which comprises a base, and first and second servo motors which are arranged on the base and controlled by a control system, wherein the first servo motor is used for driving a ball screw to be tested; the second servo motor is used for driving a reference ball screw; two sides of the reference ball screw are provided with a linear guide rail respectively, and the upper parts of the two linear guide rails are provided with a workbench; the workbench is fixed with a reference nut on the reference ball screw; the workbench is provided with a force measuring sensor and a nut sleeve which is arranged on a nut of the ball screw to be tested; and the nut sleeve is provided with a cantilever contacted with a detection end of the force measuring sensor. After the ball screw to be tested is connected with the first servo motor, the size of friction torque of a ball screw pair can be effectively measured by using a corresponding signal of the friction torque of the ball screw to be tested acquired by the force measuring sensor so as to improve the quality of a ball screw pair product and promote the dynamic performance of a numerical control machine.
Owner:WUYI UNIV

High-strength bolt axial force measuring device and measuring method

The invention discloses a high-strength bolt axial force measuring device and measuring method. The measuring device comprises a pull rod, an axial force sensor, a force providing part and a support; the close end of the pull rod is provided with a connecting part for being connected with a high-strength bolt thread end, and the close and far ends of the pull rod are provided with a first match part and a second match part respectively; the first match part is in match contact with the close end face of the axial force sensor, the second match part and the far end of the force providing part act in a match mode, the far end of the support is mounted between the force providing part and the axial force sensor, and the close end of the support is used for being supported on a part connected with a high-strength bolt; and the high-strength bolt axial force measuring device also comprises a strain measuring part arranged on a nut. The measuring method comprises the steps of (1) mounting the strain measuring part on the axial outer face of the nut; 2, connecting the pull rod with the thread end of the high-strength bolt in the match mode; and 3 starting the force providing part to read the value of the axial force sensor at proper time according to the changing condition of the stain measuring part. The high-strength bolt axial force measuring device and method are accurate in measuring by directly measuring the axial force of the high-strength bolt.
Owner:LONGYUAN BEIJING WIND POWER ENG TECH
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