US 11,988,572 B1
Device for measuring length and center of mass of conical workpiece
Yinxiao Miao, Beijing (CN); Fengju Sun, Beijing (CN); Qigang Huang, Beijing (CN); Lei Yan, Beijing (CN); Tian Bai, Beijing (CN); Xiaosan Wang, Beijing (CN); Ruidong Huo, Beijing (CN); Bingtao Gao, Beijing (CN); and Yimeng Guo, Beijing (CN)
Assigned to BEIJING AEROSPACE INSTITUTE FOR METROLOGY AND MEASUREMENT TECHNOLOGY, Beijing (CN)
Filed by BEIJING AEROSPACE INSTITUTE FOR METROLOGY AND MEASUREMENT TECHNOLOGY, Beijing (CN)
Filed on Jan. 12, 2024, as Appl. No. 18/412,018.
Claims priority of application No. 202310058877.5 (CN), filed on Jan. 13, 2023.
Int. Cl. G01M 1/12 (2006.01); G01B 11/02 (2006.01)
CPC G01M 1/122 (2013.01) [G01B 11/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A device for measuring length and center of mass of a conical workpiece, comprising:
a base;
a support mechanism;
a measuring platform;
a torsion bar;
a torsional-pendulum drive mechanism;
a torsional-pendulum brake mechanism;
an inner frame;
an outer frame;
a base plate;
two laser displacement sensors; and
a plurality of weighing mechanisms;
wherein the inner frame is in rotatable connection with the outer frame through a pin shaft;
an inner bottom surface of the inner frame is configured to be fixedly connected with a bottom surface of the conical workpiece;
the base plate is removably arranged at the inner frame, and is configured to abut against a top of the conical workpiece; and the base plate is perpendicular to an axis of the conical workpiece;
the two laser displacement sensors are fixedly arranged at a position of the inner frame below the top of the conical workpiece;
the plurality of weighing mechanisms are provided at a bottom of the outer frame; and the plurality of weighing mechanisms are configured to bear the inner frame, the outer frame and the conical workpiece;
a slewing bearing is fixedly provided on the inner bottom surface of the inner frame;
the conical workpiece is configured to be coaxially and fixedly connected with the slewing bearing to rotate with the slewing bearing;
the support mechanism is fixedly arranged on a top of the base;
a bottom surface of the measuring platform is configured to be supported on the support mechanism, and a top surface of the measuring platform is fixed with the bottom of the outer frame;
the plurality of weighing mechanisms are circumferentially and evenly distributed between a top surface of the base and the bottom surface of the measuring platform; each of the plurality of weighing mechanisms comprises a weighing sensor and a first jacking mechanism; and the first jacking mechanism is fixedly connected with the weighing sensor;
the first jacking mechanism is configured to jack up the measuring platform through jacking up the weighing sensor to separate the measuring platform from the support mechanism, so that the measuring platform, the outer frame, the inner frame and the conical workpiece are supported by the weighing sensor;
the support mechanism is an air bearing;
a first end of the torsion bar is fixedly connected with the base, and a second end of the torsion bar is fixedly connected with a rotor of the air bearing; and the torsion bar is coincident with an axis of the slewing bearing;
the torsional-pendulum drive mechanism and the torsional-pendulum brake mechanism are fixedly arranged on the base;
the torsional-pendulum drive mechanism is configured to drive the measuring platform to rotate by a preset angle to make the torsion bar be in a torsional state; and the torsion bar is configured to release a torsional stress to allow the measuring platform to drive the conical workpiece to perform torsional pendulum; and
the torsional-pendulum brake mechanism is configured to stop the torsional pendulum of the measuring platform.