Device and method for detecting states of a linear guideway

Patent metadata

Field	Value
Publication number	US-11788880-B2
Application number	US-202117305756-A
Country	US
Kind code	B2
Filing date	Jul 14, 2021
Priority date	Dec 9, 2020
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A device and a method for detecting states of a linear guideway including a sliding block and a slide rail are provided. The device includes a sensor located at a position corresponding to a side surface of the slide rail, and an analysis processer communicated with the sensor. The sensor detects the vibrating of the slide rail to generate a sensing signal. The analysis processer compares the sensing signal with at least one threshold, to determines occurrence of abnormalities. Therefore, the sensitivity for detection may be increased.

First claim

What is claimed is:

1. A method for detecting states of a linear guideway, the linear guideway including a sliding block and a slide rail, the sliding block including an accommodating groove for accommodating the slide rail, the sliding block further including two opposite side surfaces in the accommodating groove, the slide rail including two opposite side surfaces respectively corresponding to the two side surfaces of the sliding block, and the method comprising the following steps:
(A) detecting, by at least one sensor, vibration of the slide rail to generate a sensing signal, wherein the at least one sensor is located at one end of the slide rail and respectively located on or adjacent to at least one of the two side surfaces of the slide rail; and
(B) determining, by an analysis processor, occurrence of an abnormality according to a level of the sensing signal and at least one threshold, wherein:
the number of the at least one sensor is two, the two sensors are respectively located on or adjacent to the two side surfaces of the slide rail, the sensing signals generated by the two sensors detecting the vibration of the slide rail are defined as a first sensing signal and a second sensing signal, and the step (B) comprises the following steps:
(B1) determining whether a difference between a level of the first sensing signal and a level of the second sensing signal is greater than or equal to a first threshold;
(B2) the difference between the level of the first sensing signal and the level of the second sensing signal is less than the first threshold, further comparing a first feature number of the first sensing signal with a second threshold and comparing a second feature number of the second sensing signal with the second threshold by the analysis processor;
(B3) comparing the first feature number and the second feature number to determine they are both greater than or equal to the second threshold, comparing the level of the first sensing signal with a third threshold and comparing the level of the second sensing signal with the third threshold by the analysis processor;
(B4) the level of the first sensing signal and level of the second sensing signal are greater than or equal to the third threshold, determining, by the analysis processor, that an abnormality occurs at each of the two opposite sides of the linear guideway; and
the first feature number is the number of feature frequencies in the first sensing signal, and the second feature number is the number of feature frequencies in the second sensing signal.

2. A method for detecting states of a linear guideway, the linear guideway including a sliding block and a slide rail, the sliding block including an accommodating groove for accommodating the slide rail, the sliding block further including two opposite side surfaces in the accommodating groove, the slide rail including two opposite side surfaces respectively corresponding to the two side surfaces of the sliding block, and the method comprising the following steps:
(A) detecting, by at least one sensor, vibration of the slide rail to generate a sensing signal, wherein the at least one sensor is located at one end of the slide rail and respectively located on or adjacent to at least one of the two side surfaces of the slide rail; and
(B) determining, by an analysis processor, occurrence of an abnormality according to a level of the sensing signal and at least one threshold, wherein:
the number of the at least one sensor is two, the two sensors are respectively located on or adjacent to the two side surfaces of the slide rail, the sensing signals generated by the two sensors detecting the vibration of the slide rail are defined as a first sensing signal and a second sensing signal, and the step (B) comprises the following steps:
(B1) determining whether a difference between a level of the first sensing signal and a level of the second sensing signal is greater than or equal to a first threshold;
(B2) the difference between the level of the first sensing signal and the level of the second sensing signal is less than the first threshold, comparing a first feature number of the first sensing signal with a second threshold and comparing a second feature number of the second sensing signal with the second threshold by the analysis processor;
(B5) the first feature number or the second feature number is less than the second threshold, filtering the first sensing signal and the second sensing signal to generate a third sensing signal and a fourth sensing signal;
(B6) comparing a third feature number of the third sensing signal with the second threshold, and comparing a fourth feature number of the fourth sensing signal with the second threshold by the analysis processor; and
(B7) the third feature number and the fourth feature number are both greater than or equal to the second threshold, comparing the level of the first sensing signal with a third threshold and comparing the level of the second sensing signal with the third threshold by the analysis processor;
(B4) the level of the first sensing signal and level of the second sensing signal are greater than or equal to the third threshold, determining, by the analysis processor, that an abnormality occurs at each of the two opposite sides of the linear guideway,
wherein the third feature number is the number of feature frequencies in the third sensing signal, and the fourth feature number is the number of feature frequencies in the fourth sensing signal.

3. A method for detecting states of a linear guideway, the linear guideway including a sliding block and a slide rail, the sliding block including an accommodating groove for accommodating the slide rail, the sliding block further including two opposite side surfaces in the accommodating groove, the slide rail including two opposite side surfaces respectively corresponding to the two side surfaces of the sliding block, and the method comprising the following steps:
(A) detecting, by at least one sensor, vibration of the slide rail to generate a sensing signal, wherein the at least one sensor is located at one end of the slide rail and respectively located on or adjacent to at least one of the two side surfaces of the slide rail; and
(B) determining, by an analysis processor, occurrence of an abnormality according to a level of the sensing signal and at least one threshold, wherein:
the number of the at least one sensor is two, the two sensors are respectively located on or adjacent to the two side surfaces of the slide rail, the sensing signals generated by the two sensors detecting the vibration of the slide rail are defined as a first sensing signal and a second sensing signal, and the step (B) comprises the following steps:
(B1) determining whether a difference between a level of the first sensing signal and a level of the second sensing signal is greater than or equal to a first threshold;
(B2) the difference between the level of the first sensing signal and the level of the second sensing signal is less than the first threshold, comparing a first feature number of the first sensing signal with a second threshold and comparing a second feature number of the second sensing signal with the second threshold by the analysis processor;
(B5) the first feature number or the second feature number is less than the second threshold, filtering the first sensing signal and the second sensing signal to generate a third sensing signal and a fourth sensing signal;
(B6) comparing a third feature number of the third sensing signal with the second threshold, and comparing a fourth feature number of the fourth sensing signal with the second threshold by the analysis processor; and
(B7) the third feature number or the fourth feature number is less than the second threshold, determining, by the analysis processor, that the linear guideway is normal,
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Assignees

• Hiwin Tech Corp

Inventors

• Lee Po-Lin
• Chen Hsien-Yu
• Yang Stephanie Chun-Ming

Classifications

• G01H7/00 Primary

  Measuring reverberation time {; room acoustic measurements} · CPC title

• F16C29/005 Primary

  Guide rails or tracks for a linear bearing, i.e. adapted for movement of a carriage or bearing body there along · CPC title

• F16C41/00 Primary

  Other accessories, {e.g. devices integrated in the bearing not relating to the bearing function as such} · CPC title

• F16C2233/00

  Monitoring condition, e.g. temperature, load, vibration · CPC title

• G01H1/08

  Amplitude · CPC title