Foreign object detection device and linear guide
A foreign object detection and foreign object technology, applied in measuring devices, geophysical measurements, bearing assembly, etc., can solve problems such as the decline of life of vibration linear guides
Active Publication Date: 2020-03-24
THK CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
When the linear guide is exposed to such foreign matter such as peeling matter, the foreign matter enters the raceway surface and the sliding surface, and the vibration during linear motion becomes significant or the life of the linear guide is reduced.
Method used
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Embodiment 1
[0031] figure 1 It is a perspective view showing one embodiment of the linear guide 1 as one of the rolling guide devices to which the foreign object detection device 10 of the present invention is applied. The linear guide 1 is composed of a linear guide rail 3 as a track member and a moving block 2 as a moving member. The moving block 2 is attached to the guide rail 3 in a channel shape via a plurality of balls as a plurality of rolling elements. And there is an infinite circulation path of balls inside, and the moving block 2 is relatively moved along the longitudinal direction on the guide rail 3 through the circulation of the balls in the infinite circulation path of the moving block 2 .
[0032]The guide rail 3 is formed to have a substantially rectangular cross section. Further, bolt mounting holes 32 are formed at predetermined intervals along the central axis in the longitudinal direction of the upper surface 33 in the direction from the upper surface 33 to the lower...
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An object of the present invention is to detect foreign matter including a magnetic material with as little amount as possible and with high precision. In the foreign object detection device of the present invention, the first yoke and the second yoke are respectively adjacent to the permanent magnets, and the two yokes are arranged with a reference space therebetween. In addition, a detour yoke part is disposed which is separated from the first yoke part via a first detour space different from the reference space, and which is separated from the second yoke part of the second yoke part via a second detour space. Predetermined parts are arranged separately, the reluctance of the first detour space is smaller than the reluctance of the predetermined reference space, and the reluctances of the second detour space and the first detour space are larger than the reluctance of the predetermined reference space. On this basis, based on the magnetic flux density in at least one of the reference space and the first detour space corresponding to the storage amount of the foreign matter stored in the storage portion provided in the second detour space, A detection signal related to the foreign matter is output.
Description
technical field [0001] The present invention relates to a device for detecting foreign matter including a magnetic material, and a linear guide provided with the device. Background technique [0002] When the linear guide as a linear motion device is driven, peeling occurs on the raceway surface or the surface (sliding surface) of the rolling elements, exposing the linear guide. When the linear guide is exposed to such foreign matter such as peeling matter, the foreign matter enters the raceway surface or the sliding surface, causing a problem that vibration during linear motion becomes conspicuous or the life of the linear guide decreases. In this regard, for example, Patent Document 1 discloses a technique related to a linear motion device including a detection device for detecting metal foreign objects. In this technology, a pair of electrodes are arranged in a part of the linear motion device where foreign matter is likely to accumulate. When foreign matter accumulates...
Claims
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IPC IPC(8): F16C29/06F16C19/52F16C41/00
CPCF16C41/00F16C19/52F16C29/06G01N33/2858G01N27/72G01R33/0011G01R33/038G01R33/07G01V3/105
Inventor 森行良直
Owner THK CO LTD