Method for judging linear transmission element oil injecting time

Abstract

The invention discloses a method for judging linear transmission element oil injecting time. The method includes the steps of signal extraction, namely, arranging a sensor on a linear transmission element to extract physical signals when the linear transmission element actuates; signal conversion, namely, converting the physical signals into characteristic values by an algorithm; characteristic value establishment and storage, namely, establishing and storing the relations between the characteristic values and time in a coordinate with the characteristic value serving as a longitudinal axis and the time serving as a horizontal axis so as to form a characteristic value changing curve, and dividing the horizontal axis into a plurality of time segments; characteristic value computation, namely, computing a slope value according to the characteristic values corresponding to each two adjacent time segments, and computing the sum of the slope values in each time segment; oil injection judgment, namely, judging whether or not the sum of the slope values in each time segment is smaller than a set value, wherein oil slick is insufficient if yes, or otherwise, the oil slick is sufficient.

Description

technical field [0001] The invention relates to a linear transmission element, in particular to a method for judging the oiling timing of a linear transmission element. Background technique [0002] The ball screw in the linear transmission element is mainly composed of a nut screwed with the screw shaft through free-rolling balls, and uses the free-rolling balls to make the nut and the screw shaft slide relative to each other, due to its excellent smoothness Therefore, it is widely used in various machines that require precise movement, so the lubrication of the helical track inside the ball screw is particularly important. If the ball screw lacks lubrication for a long time, it may cause increased friction between the nut and the screw and accelerate the wear of the ball screw. Therefore, it is more important to judge the timing of oiling the ball screw. For this reason, the prior patents that can determine the timing of oil injection are listed below. [0003] Refer to ...

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Problems solved by technology

[0003] Refer to the Japanese patent JPA_2004-347401, which is used to judge whether the lubrication of the bearing is sufficient. It mainly uses the accelerometer to sense the vibration signal of the bearing, and after converting it into a spectrum signal, judge the lubrication of the bearing by the defined threshold value. Is it enough to control the oiling device to automatically oil the bearings? However, the prior patent must build a database in advance to define the threshold value, and must analyze the spectrum signal at the same time and then compare it with the threshold built in the database. The comparison of the values ​​highlights the defect that the cost of judging the timing of oil injection is too high, and the previous patent proposal is aimed at judging the timing of oil injection for bearings, and cannot be directly applied to linear transmission elements, especially ball screws or ball splines.

[0004] Refer to the Japanese patent JPA_1998-318261, which is used to judge whether the lubrication of the bearing is sufficient. It mainly uses the amplitude and period of the signal sensed by the sensor to judge whether the lubrication of the bearing is sufficient, so as to control the automatic lubrication of the oiling device. The oiling action of the bearing, however, the prior patent does not specify the amplitude and cycle length of the signal exceeding this, which makes it difficult to realize, and the prior patent is for the judgment of the oiling timing of the bearing, which cannot be directly applied On linear transmission elements, especially ball screws or ball splines

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