Protective cover for proximity sensor

Abstract

The invention discloses a protective sleeve of a closed-space sensor. The protective sleeve is made of non-magnetic materials. The first end of the protective sleeve is provided with a sleeve part. The sleeve part is used for being sleeved onto the outside of a sending end of the closed-space sensor. Meanwhile, the outer surface of the protective sleeve is enabled to be located onto the non-sensing area of the closed-space sensor. The second end of the protective sleeve is provided with a perforative penetrating and extending part. The penetrating and extending part is located inside the sensing area of the closed-space sensor. In this way, a sensing member extends to penetrate through the sensing area so as to trigger the closed-space sensor. As a result, the outer surface of the protective sleeve effectively prevents metal foreign matters for being sputtered into the sensing area of the closed-space sensor, so that the mis-triggering rate of the closed-space sensor is greatly reduced. Meanwhile, the protective sleeve is simple in structure, easy to manufacture and assemble, thus being very practical.

Description

technical field [0001] The invention relates to a protective cover which can effectively prevent a proximity sensor from adhering metal foreign matter in a sensing area to greatly reduce the probability of false triggering, and has a simple structure and is easy to manufacture and assemble. Background technique [0002] Proximity Sensors are currently widely used in automated machinery, semiconductor equipment or machine tools, etc.; proximity sensors mainly sense the presence or absence of sensing parts in a non-contact manner, so that the controller can obtain the quantity information of the sensing parts or make the control The device obtains the location information of the current institution. Such as figure 1 As shown, taking an inductive proximity sensor 10 as an example, it utilizes an internal LC and a transistor circuit to generate oscillations, so that the sensing area A of the sensing end 11 at the front end of the sensor generates a high-frequency electromagneti...

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Problems solved by technology

Because the proximity sensor 10 of this inductive type must be sensed by electromagnetic effects, the inductive element it can sense must be a metal object with magnetic permeability, and because the range of magnetic force lines around the oscillating coil will be affected by surrounding objects, this inductive type When there are other magnetically permeable objects or other proximity sensors near the proximity sensor 10, it is easy to generate sensing errors, resulting in false triggering

As far as the machine tool is concerned, since the machine tool is mainly used for processing metal workpieces, many metal chips will be generated during the processing, and the metal chips are very easy to splash and adhere to the sensing end 11 of the front end of the proximity sensor 10. In the sensing area A, and then make the proximity sensor 10 produce a sensing error, resulting in false triggering

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