A device and method for early warning and identification of grinding wheel broken state

Abstract

The invention provides a grinding wheel broken state early warning recognition device and method. The device includes an acoustic emission sensor, a preamplifier, a signal processor, an A / D acquisition card and a controller which are connected in turn; the acoustic emission sensor firstly acquires an acoustic emission signal in a rotation process of a to-be-detected grinding wheel, and the acoustic emission signal is pretreated through the preamplifier, the signal processor and the A / D acquisition card, then is inputted in the controller and is subjected to digital filtering treatment in the controller; then the signal after filtering is subjected to temporal segmentation treatment according to equal-long time windows by the controller, and a signal amplitude value Hi and an energy value Ei<-> in each time window are calculated, followed by, comparing the signal amplitude value Hi and the energy value Ei<-> in the current time window with a set comparison threshold value H0 and E1<->, and judging the state of the grinding wheel. The device and the method are capable of detecting and identifying the grinding wheel crack nucleation state, and make a judgment and early warning on grinding wheel breaking in advance, and greatly improve the sensitivity of detection.

Description

technical field [0001] The invention relates to the manufacturing and application technology of grinding wheels, in particular to an early warning identification device and method for the broken state of grinding wheels. Background technique [0002] The grinding wheel is a hard and brittle composite material. The internal quality of the grinding wheel, such as stress expansion and crack nucleation, is related to the safety of the grinding wheel. Especially for high-speed and ultra-high-speed grinding, the breaking and breaking of the grinding wheel will cause serious property loss and personal injury. . Rotation strength is the most important technical parameter of various grinding wheels. For this reason, mandatory inspection standards have been established for the detection of grinding wheel rotation strength at home and abroad. Maintain for the specified time after arrival. At the same time, in order to fully understand the high-speed rotation performance of the grindi...

AI Technical Summary

Problems solved by technology

Vibration detection is to use the acceleration sensor to detect the change of the vibration state of the grinding wheel protection cavity when the grinding wheel is broken to judge whether the grinding wheel is broken. Normal vibration and the vibration caused by the resonance of the equipment itself. However, some grinding wheels, such as superhard material grinding wheels, are generally broken in the local working layer when broken, and the fragments are very small, and the impact on the protective cavity of the rotary strength testing machine is limited. As a result, this method cannot accurately detect the broken state of small fragments; photoelectric detection is to use photoelectric sensors to detect the integrity of the shape of the tested grinding wheel to determine whether the identified grinding wheel is broken. This method requires the tested grinding wheel to have good reflectivity. And it is required that the crushing of the grinding wheel must be broken as a whole, so this detection method has certain limitations; the volume detection is to use the volume sensor to detect the noise signal generated by the impact of the grinding wheel protection cavity when the grinding wheel is broken to determine whether the grinding wheel is broken. This method is easily disturbed by external noise, so the application of this method needs to ensure the specific working environment and conditions

At the same time, these three detection methods all judge the broken state of the grinding wheel after the grinding wheel is broken, and the sensitivity is low, and there is a certain time lag in the detection process, which is easy to cause great damage

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