High-accuracy micro-displacement detection device for deep hole internal diameter detection

Abstract

The invention belongs to the technical field of instruments and meters, and in particular discloses a high-accuracy micro-displacement detection device suitable for deep hole internal diameter detection. In the device, the front end of a measuring bracket is fixedly provided with a rotary frame; the rotary frame is symmetrically provided with an alloy measuring head and an alloy contact; the measuring bracket is provided with a sensor seat; the sensor seat is symmetrically provided with sensors; the sensors are arranged opposite to the alloy measuring head and connected with an input end of an analog-to-digital converter through a differential transformer interface circuit; and the analog-to-digital converter is connected with a display, a communication interface circuit and a printing interface circuit through a microprocessor respectively. In the device, an inductive displacement sensor is matched with a mechanical device to detect a deep hole internal diameter micro-displacement signal; and the signal is collected and converted through a linear variable differential transformer (LVDT) signal processing circuit and a data acquisition station (DAS) system group chip and transmitted into the microprocessor to realize signal processing and compensation calculation so as to acquire deep hole internal diameter data. The device has a simple structure and high stability, sensitivity and reliability, and is easy and convenient to use and operate.

Description

technical field [0001] The invention belongs to the technical field of instruments and meters, and is particularly suitable for a high-precision micro-displacement detection device for deep hole inner diameter detection. technical background [0002] Deep hole parts are widely used in mechanical engineering and other equipment, such as oil cylinders, cylinders, various pipelines, and artillery barrels in weapons. The holes on this kind of parts not only have a large aspect ratio, but also have relatively high detection requirements. Taking the gun barrel as an example, its inner diameter is in the range of 25-160mm, and its length can reach more than 10m. The characteristic of the measurement method is to detect the micro-displacement of the aperture change by using an inductive displacement sensor, a mechanical transmission mechanism, a sensor excitation circuit, a signal conversion circuit, etc. At present, the mechanical transmission mechanism and the signal processing ...

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Problems solved by technology

[0003] 1. In the mechanical transmission mechanism, the probe of the inductive displacement sensor is seriously worn, and the maintenance workload increases

[0004] 2. In the mechanical transmission mechanism, it is not suitable for the measurement method of deep holes with male and female rifling.

[0005] 3. When the instrument is calibrated, the signal conversion circuit is still adjusted by the mechanical potentiometer, which is greatly affected by the use environment

[0006] 4. Since the processing consistency of the inductive displacement sensor cannot meet the measurement accuracy requirements, it is usually necessary to add compensation components for each sensor to correct, and the operability is poor

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