Precision spherical hinge joint gap detection method based on spherical capacitance principle

A technology of joint clearance and detection method, which is applied in the field of measurement, can solve the problems of difficult precision ball joint joint clearance detection, etc., and achieve the effect of compact structure, simple algorithm and high precision

Active Publication Date: 2015-06-03
HANGZHOU DIANZI UNIV
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  • Precision spherical hinge joint gap detection method based on spherical capacitance principle
  • Precision spherical hinge joint gap detection method based on spherical capacitance principle
  • Precision spherical hinge joint gap detection method based on spherical capacitance principle

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] The method for detecting the joint clearance of precision ball hinges based on the principle of spherical capacitance, the specific steps are as follows:

[0024] Step 1, such as figure 1 , 2 , 3 and 4, the static plate CJ i Fixed in the ball socket, where i=1,2...8, and distributed in eight quadrants of the three-dimensional coordinate system to form a spherical surface; the static plate CJ i All are spherical electrodes of equal size and concentric with the ball socket; the ball socket adopts a transverse split structure, including the ball hinge seat 1-1 and the ball hinge end cover 1-2; the ball head 2-1 is used as a movable plate, and is connected with Static plate CJ i Eight spherical capacitors 3 are formed; the ball hinge output rod 2-2 is fixed with the ball head 2-1. The ball head 2-1 is made of a material with good conductivity, s...

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Abstract

The invention discloses a precision spherical hinge joint gap detection method based on a spherical capacitance principle. The detection technology for spherical hinge joint gaps is still immature; a method for detecting the eccentric displacement of a rotor in an electrostatic gyroscope technology is difficult to be directly used for precision spherical hinge joint gap detection. The precision spherical hinge joint gap detection method comprises the following steps of fixing static pole plates CJi in a ball socket, wherein i is equal to 1, 2, ..., 8, and distributing the static pole plates CJi in eight quadrants of a three-dimensional coordinate system to form a spherical surface in an encircling mode; taking a spherical head as a dynamic pole plate, and forming eight spherical surface capacitors with the static pole plates CJi; establishing a calculation model between a detected differential capacitance value and the eccentric displacement of the spherical head, and thus obtaining the gap error of precision spherical hinge joints. The method realizes real-time non-contact detection of three degree of freedom eccentric displacement of the spherical hinge joints according to the principle that the change of the gap between the capacitance plates of a spherical surface causes the change of output capacitance.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a precision ball hinge joint gap detection method based on the principle of spherical capacitance. Background technique [0002] The ball hinge is a commonly used three-degree-of-freedom mechanical joint. It has the advantages of compact structure, flexible movement and strong bearing capacity. It has become a key component in mechanical equipment such as parallel mechanisms, industrial robots and auto parts. [0003] Due to manufacturing and installation errors, there must be a gap between the ball head and the ball socket of the ball joint in practical applications, which inevitably causes the output rod to deviate from the ideal position during the process of the ball joint transmitting motion and force , thus affecting the transmission accuracy of the system. At present, there are many theoretical studies on the influence of ball joint clearance error on the ...

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Application Information

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IPC IPC(8): G01B7/02G01B7/14
Inventor 王文张敏卢科青范宗尉袁科杰诸丽燕赵鼎成
Owner HANGZHOU DIANZI UNIV
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