Cylindrical coordinate measuring machine

Abstract

The invention discloses a cylindrical coordinate measuring machine which is high in measuring precision. The cylindrical coordinate measuring machine comprises a rotation shaft system, a sliding car body, a measuring head unit and a counter weight device. The rotation shaft system is arranged on a base provided with a center positioning device, and the two sides of the rotation shaft system are provided with a measuring cross arm and a counter weight cross arm respectively. The sliding car body is movably arranged on the measuring cross arm and can move in the radial direction of the rotation shaft system through keeping of a first motion guiding mechanism. The measuring head unit is movably arranged on the sliding car body and can move in the direction parallel to the center axis of the rotation shaft system. The rotation shaft system comprises a main shaft and a main shaft sleeve which is connected with the main shaft in a rotating and matched mode. The measuring cross arm and the counter weight cross arm are arranged on the two sides of the main shaft sleeve respectively, and the base is arranged at the lower end of the main shaft. In addition, the guiding track of the first motion guiding mechanism on the measuring cross arm inclines upwards in the radial direction away from the rotation shaft system, and therefore variation of the deformation of the measuring cross arm can be compensated when the sliding car body moves.

Description

technical field [0001] The invention relates to a measuring device, in particular to a cylindrical coordinate measuring machine. Background technique [0002] Cylindrical coordinate measuring machine is a digital geometric quantity measuring instrument that uses sensing technology and electronic technology to measure the coordinates of cylindrical coordinate system objects (hereinafter referred to as the measured object). It is used to measure the X, Y and C axis coordinates of the surface of the measured object. In order to determine the relevant parameters of the measured object. Cylindrical coordinate measuring machines are currently mainly used in manufacturing industries such as ships, aviation, and hydropower equipment to measure workpieces with complex spatial structures and shapes, such as the measurement of propeller blade pitch. [0003] The structure of a cylindrical coordinate measuring machine to be improved in the present invention mainly includes: a rotating ...

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Problems solved by technology

[0005] The improved cylindrical coordinate measuring machine of the present invention mainly has the following problems: first, when the trolley body moves, the torque borne by the measuring cross arm will change, resulting in a corresponding slight change in the deformation of the measuring cross arm, and finally Affect the levelness of the movement of the tackle body; second, in the case of using the central positioning device, to ensure the accuracy of the cylindrical coordinate measuring machine, it is naturally required that the positioning center of the central positioning device coincides with the central axis of the rotating shaft system; However, due to the rotation of the measuring cross arm, the counterweight cross arm and the reciprocating motion of the trolley body, the force on the rotating shaft system will change, which will easily affect the coaxiality between the positioning center of the center positioning device and the central axis of the rotating shaft system , thereby reducing the measurement accuracy

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