Grating and anti-interference method

Abstract

The invention discloses a grating and an anti-interference method. The anti-interference method of the grating comprises the following steps that S1, double pulses are transmitted at each time at eachlight spot; S2, the two pulses are wide and narrow, the pulse A is wide first and then narrow, and the pulse B is narrow first and then wide; S3, the interval time of the adjacent pulses is larger than the wide pulse time, namely, it is ensured that the two pulses cannot be connected into one pulse under the condition of interference; S4, the interval from the complete transmission of one light spot to transmission of the next light spot must be larger than the light-emitting time of the whole spot to prevent one light spot from being interfered by two light spots; and S5, during receiving, the two pulses need to be received, and the designated position (A is the first point) is the wide pulse. According to the anti-interference method, judgment can be made once at any phase; the two setsof gratings transmit / receive optical pulses with different characteristics; no matter which relative phase of two optical pulse signals is, the situation of misjudgment or incapability of judgment cannot be caused; mutual interference-free operation of the two sets of gratings is realized; performance such as response time is not reduced; and the operation is stable and reliable.

Description

technical field [0001] The invention relates to a grating, in particular to a grating and an anti-interference method. Background technique [0002] The safety grating is also a photoelectric safety protection device (also known as a safety protector, a punch protector, an infrared safety protection device, etc.). Generally speaking, the safety grating exists in pairs and is divided into a transmitting end and a receiving end; A kind of photoelectric equipment for machinery, which can avoid casualties. This type of mobile machinery includes punching machines, winding machines, palletizers, elevators, etc. Safety light barriers can be used to replace traditional mechanical barriers or other forms of mechanical protection, and can also increase the maintainability of equipment. Cooperating with safety light barriers, it can also increase the operability and efficiency of mechanical equipment (like some semi-automatic equipment). [0003] The existing two sets of mutual inter...

AI Technical Summary

Problems solved by technology

[0003] The existing two sets of mutual interference prevention gratings usually adopt the frequency conversion method, that is, the two sets of gratings use different frequencies to distinguish each other; in the frequency conversion method, theoretically, there is a possibility that a single judgment cannot be clearly determined, and it is necessary to make a comprehensive judgment based on the previous situation; If the two sets of ordinary gratings are installed too close together, it will cause misjudgment due to mutual interference, or even fail to work normally; using different transmission frequencies can basically solve the problem of mutual interference, but in special cases, it may not be able to be judged immediately due to signal overlap

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