Method for detecting decreased preload in ball screw and linear motion drive device
A ball screw, detection method technology, applied in the direction of measurement device, transmission device, measurement vibration, etc., can solve the problem of detection without considering the reduction of preload
Pending Publication Date: 2021-04-30
NSK LTD
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Problems solved by technology
In addition, the methods disclosed in Patent Documents 1 and 2 need to compare the vibration signal of the ball screw of the inspected product with the vibration signal of the ball screw of the normal product, so it is necessary to obtain the vibration signal of the ball screw of the normal product
In addition, the methods disclosed in Patent Documents 1 and 2 are aimed at detecting damage such as indentation and peeling on components such as balls, and do not consider the detection of preload reduction due to wear and the like.
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[0021] refer to figure 1 One embodiment of the present invention will be described in detail. figure 1 This is a schematic configuration diagram of a linear drive unit equipped with a ball screw that can detect a drop in preload.
[0022] figure 1 The linear motion driving device has: a ball screw 9; a linear motion table 1 (corresponding to a linear motion part as a constituent element of the present invention), which is driven by the ball screw 9 to move linearly; and an abnormality detection device 11, It detects a decrease in the preload applied to the ball screw 9 .
[0023] Moreover, this abnormality detection device 11 has: a vibration sensor 10, which measures the vibration when the ball screw 9 is in operation; (for example, the total value); and the abnormality detection unit 13, which uses the vibration value at the initial stage of operation or normal operation of the ball screw 9 as a reference value, and when the vibration value is lower than a predetermined t...
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Provided are a method for detecting a decrease in a preload applied to a ball screw; and a linear motion drive device provided with a ball screw the preload of which can be detected. The linear motion drive device is provided with the ball screw (9); a linear motion table (1) that is driven by the ball screw (9) to linearly move; and an abnormality detection device (11) that detects a decrease in the preload applied to the ball screw (9). The abnormality detection device (11) has a vibration sensor (10) that measures vibrations when the ball screw (9) operates; a calculation processing unit (12) that acquires, among vibration signals measured by the vibration sensor (10), a vibration value of a vibration signal in a specific frequency range; and an abnormality detecting unit (13) that determines the occurrence of a decrease in the preload in the ball screw (9) when the vibration value during the initial operation stage or the normal operation of the ball screw (9) is set to a reference value, and the vibration value is smaller by a predetermined threshold than the reference value.
Description
technical field [0001] The invention relates to a method for detecting preload drop of a ball screw and a direct drive device. Background technique [0002] Various methods of detecting abnormality of the ball screw have been proposed. For example, Patent Document 1 discloses a method of measuring the vibration of a ball screw during operation, performing frequency analysis on a vibration signal in a frequency band equal to or lower than the natural frequency of the nut in the obtained vibration signal, and comparing it with a normal ball screw. By making a comparison, an abnormality occurring on the ball screw is detected. [0003] In addition, Patent Document 2 discloses a method of measuring the vibration of the ball screw during operation, and comparing the 2nfb component in a specific frequency band synchronized with the rotation speed of the screw shaft with that of a normal ball screw to detect the vibration in the ball screw. Abnormalities such as ball damage and b...
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IPC IPC(8): G01M13/028F16H25/22
CPCF16H25/22G01M13/028G01M13/045G01H1/003G01H17/00F16H25/2204
Inventor 松村惠介大谷雄志桥本聪志
Owner NSK LTD