Vacuum furnace and its window cleaning device

Abstract

The invention relates to a vacuum furnace and a window cleaning device thereof. The outside of the vacuum furnace is provided with a mounting base for installing the window. The cleaning device includes a pull rod and a cleaning head. The pulling rod is inserted into the mounting base and can be pulled and moved inward and outward of the mounting base; the cleaning head is located at the inner end of the pulling rod. While the pull rod is being pulled, clean the inside of the window. The cleaning device can realize online cleaning of the window under normal temperature and high temperature conditions. After the inside of the window is blocked by pollution, the inner side of the window will be cleaned online in real time to ensure the measurement accuracy of the in-situ measurement device in a high temperature and high vacuum environment. The cleaning process It is easy to operate and ensures the vacuum in the furnace cavity.

Description

technical field [0001] The invention relates to the field of high-temperature vacuum furnaces, in particular to a vacuum furnace and a window cleaning device thereof. Background technique [0002] At present, window cleaning devices are widely used in aerospace, automobile, food, tobacco, outdoor video surveillance equipment and other industries. Work at normal temperature and normal pressure. The cleaning methods commonly used in the industry are mainly divided into two types: contact cleaning and non-contact cleaning. The contact cleaning method mainly means that the cleaning brush directly acts on the window, and the window is cleaned through the movement of the mechanical swing arm. Taking the car wiper as an example, its main purpose is to prevent rainwater and other pollutants from affecting the driver's sight. The wiper rubber strip is made of rubber with strong ozone and ultraviolet resistance, which has good water and dirt removal effects, but this kind of rubber ...

AI Technical Summary

Problems solved by technology

However, in the process of use, it was found that the in-situ measurement device has high requirements on the permeability of the measurement window. During the measurement process, as the permeability of the window decreases, the measurement data will drift, which will affect the measurement accuracy. In severe cases, it will not be possible to measure. This phenomenon is especially obvious in traditional high-temperature vacuum resistance furnaces, and the main reasons are as follows:

[0005] (1) For a resistance furnace with a temperature exceeding 1000°C, especially in a high vacuum environment, the heating body usually uses molybdenum wire or graphite heating body, and the trace volatiles in the use process will adhere to the surface of the window, reducing the ventilation of the window. transmittance;

[0006] (2) When the operating temperature exceeds 1000 °C, the structural parts in the furnace, such as specimen fixtures, heat shields, heat insulation cotton, etc., and even some oxygen-sensitive specimens themselves will produce a small amount of oxidized volatiles to adhere to The surface of the window reduces the transparency of the window;

[0007] (3) It is difficult to ensure that the furnace cavity is free from any pollution during the cleaning process of the high-temperature furnace. These pollutants will volatilize and adhere to the surface of the window during the high-temperature process, reducing the permeability of the window;

[0009] There are few studies on window cleaning devices for high-temperature and high-vacuum furnaces, and the main technical difficulties are as follows: First, the window can only be cleaned by contact cleaning, because the high-speed air flow formed by the gas to clean the window will reduce the vacuum in the furnace. Fluctuations with the temperature will affect the measurement results, and the complete removal of volatiles with high adhesion cannot be guaranteed; second, the cleaning device tooling design should ensure the cleaning effect of the window; third, the material of the cleaning device, especially the cleaning brush material The selection of the cleaning device should meet the long-term use at high temperature; fourth, the cleaning device should not only ensure the flexibility of operation, but also ensure the vacuum degree in the furnace cavity during use.

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