Shutter type vacuum furnace inspection window

Abstract

The invention relates to a shutter type vacuum furnace inspection window. The shutter type vacuum furnace inspection window comprises an inspection window cylinder which can be arranged on a vacuum furnace inspection opening, an imaging pore plate arranged at the foremost end of the inspection window cylinder, a glass optical lens, a lens pressing plate and a sealing ring which is arranged betweenthe lens and the cylinder and used for forming a vacuum sealing loop, wherein the glass optical lens and the lens pressing plate are arranged at the rear end of the inspection window cylinder. An argon inflating channel is formed between the glass optical lens and the imaging pore plate. An imaging lens cone is arranged on the outer side of the glass optical lens, and the lens cone is internallyprovided with a focusing lens and an imaging lens. Due to the fact that blade slits are driven to form a shutter through the rotation of the motor, the stroboflash phenomenon cannot be avoided. When an operator directly observes, visual fatigue can be caused by stroboflash, which is very harmful to the operator which works for a long time. When a camera is used for carrying out remote monitoring,due to the fact that the speed of the slit shutter is different from the scanning frequency of the camera, alternate dark space frequently appears on a remote monitoring screen. The problems are all caused by slit stroboflash and cannot be avoided.

Description

technical field [0001] The invention relates to a vacuum furnace observation window structure and a protection method, in particular to a stroboscopic-free observation window structure and a protection method thereof, which can work continuously for a long time and prevent volatile matter from adhering to the lens. Background technique [0002] During the smelting or evaporation process in the vacuum furnace, the staff often need to observe the materials and working conditions in the furnace, so as to grasp the situation in the furnace at any time, control and adjust the process and avoid accidents. This is particularly important for electron beam melting furnaces and vacuum coating equipment, but various evaporative substances in the furnace are often evaporated and attached to the lenses of the observation window, forming a shield and seriously hindering the operation of the staff. Therefore, a reliable and stable observation window that can protect the observation window ...

AI Technical Summary

Problems solved by technology

[0007] Considering the current situation of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a flicker-free vacuum furnace observation mechanism based on the principle of pinhole imaging, which can completely overcome the existing "flicker window" structure in principle. The defects of the observation window flickering, complex mechanism, large volume and high cost greatly improve the performance of the observation window of the vacuum furnace

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