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Fine adjustment device for capacitive sensor

A technology of capacitive sensors and fine-tuning devices, which is applied in the direction of electric devices, measuring devices, instruments, etc., can solve the problems of thread pitch limitation, low adjustment accuracy, thread backlash, etc., and achieve small fine-tuning, convenient adjustment, and small The effect of fine-tuning

Inactive Publication Date: 2012-12-26
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fine-tuning device for capacitive sensors, which solves the problem of the existing differential thread fine-tuning device, due to the limitation of the pitch, the adjustment accuracy is not high, and there is a backlash in the thread during the adjustment process

Method used

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  • Fine adjustment device for capacitive sensor
  • Fine adjustment device for capacitive sensor
  • Fine adjustment device for capacitive sensor

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Embodiment

[0023] To make a fine-tuning device, the capacitance probe 7 of the sensor is required to be H=84mm long and 9mm in diameter, and the desired fine-tuning sensitivity is 1μm / rad.

[0024] Step 1. Determine the spring stiffness ratio. Take the pitch of the thread on the fine-tuning sleeve P=2mm, the known fine-tuning sensitivity ρ=10 -3 mm / rad, substituting formula (2) into: k y k r ≈ 318 - - - ( 3 )

[0025] Step 2. Determine the parameters of the spring. According to the existing public literature and technical data, (Note, here refers to the "Mechanical Design Fundamentals" [M]. Beijing. Higher Education Press, 2006, p308~318, edited and published by Yang Kezhen, Cheng Guangyun, and Li Zhongsheng). The stiffness of each spring is:

[0026] k y = G d y 4 8 D 2 3 n y k r = G d r 4 8 D 2 3 n r - - - ( 4 )

[0027] Where G is the shear modulu...

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Abstract

The invention discloses a fine adjustment device for a capacitive sensor. A fixed sleeve, a spring A, a check ring, a spring B, a one-way thrust ball bearing and a fine adjustment sleeve are sleeved on a capacitive probe from front to back in sequence; the check ring is fixedly connected with the capacitive probe; the fixed sleeve and the fine adjustment sleeve are in slidable nesting with the capacitive probe; the fixed sleeve is in threaded connection with the fine adjustment sleeve; one side of the one-way thrust ball bearing is in contact with the spring B, and the other side of the one-way thrust ball bearing is in contact with the bottom surface of the fine adjustment sleeve; and the rigidity of the spring B is less than the rigidity of the spring A. According to the fine adjustment device, smaller fine adjustment can be realized by using a double-spring fine adjustment structure, and no reverse clearance is formed, so that the fine adjustment for the distance between a probe of the capacitive sensor and a tested workpiece is smaller; and the fine adjustment device is more convenient to adjust.

Description

Technical field [0001] The invention belongs to the technical field of mechanical measurement, and relates to a fine-tuning device of a capacitive sensor. Background technique [0002] The capacitance sensor is composed of two plates, which can measure the change of small displacement. In the measurement process, the metal object to be measured is usually used as a plate, and the capacitance probe is used as another plate. Capacitive sensors can be equipped with a measuring bench to perform various precision measurements, such as the thickness, inner diameter, outer diameter, ovality, parallelism, straightness, radial runout, etc. of the workpiece. It is widely used in the length and displacement of the machinery manufacturing industry. measuring. [0003] The capacitance sensor needs to fine-tune the distance between the plates when measuring. The existing differential thread fine-tuning device has low adjustment accuracy due to the limitation of the pitch, and there is a backla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/00G01B7/02
Inventor 王世军何花兰苏夏思赵金娟
Owner XIAN UNIV OF TECH
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