A bearing housing for monitoring the temperature of a bearing

Abstract

The utility model discloses a bearing pedestal of monitoring bearing temperature, including the body, is provided with the receiving hole of receiving bearing on the body, is provided with the mounting seat and the pinhole on the body outer wall, is installed on the mounting seat and has the fluorescent fiber sensor, the fluorescent fiber sensor includes the protective sleeve of cladding in the fiber outside, the laser of emitting pulse laser and the photoelectric detector of detecting fluorescence intensity, the front part of fiber is coated with the fluorescence coating that excites fluorescence under the action of pulse laser, the utility model has the beneficial effects that: through the fluorescent fiber sensor direct contact bearing outer ring, laser excitation fluorescence substance emits fluorescence, measures fluorescence afterglow decay time through the photoelectric detector, and converts into temperature value, this mode can realize the temperature of the monitoring bearing outer ring of second level, in addition, the utility model still uses the hoop structure, can fix the fiber effectively, effectively avoids the vibration of working condition and leads to the fiber slack.

Description

Technical Field

[0001] This utility model relates to the field of bearings, and in particular to a bearing housing for monitoring bearing temperature. Background Technology

[0002] The temperature rise of the ball screw support bearing directly affects the transmission accuracy, lifespan, and system reliability. Therefore, the necessity of real-time temperature monitoring of the corresponding bearing is reflected in the following aspects: Precision assurance: Temperature rise causes thermal expansion and deformation of the lead screw (approximately 0.01-0.03 mm elongation for every 1℃ increase in temperature per 1000 mm), leading to positioning errors. Data shows that the temperature rise at the bearing support is significantly higher than in other parts of the lead screw.

[0003] Fault prevention: Excessive preload or pretension will exacerbate friction and temperature rise. A pretension value exceeding 5°C may cause the support bearing to burn out. Real-time temperature monitoring can provide early warning of problems such as lubrication failure and improper assembly, so as to compensate for thermal deformation.

[0004] Lifespan optimization: Grease ages rapidly when bearing temperature exceeds 80°C, with 100°C being a dangerous threshold. Real-time temperature monitoring provides data to assist automated systems in adjusting operating conditions (such as reducing preload) to extend bearing lifespan.

[0005] For bearing temperature monitoring, current methods include infrared thermal imaging and applying thermochromic coatings. Infrared thermal imaging offers high real-time performance but low accuracy and high cost; thermochromic coatings offer low real-time performance and low accuracy, and require periodic inspections to obtain temperature data, making them unsuitable for intelligent systems. Utility Model Content

[0006] The purpose of this invention is to provide a bearing housing for monitoring bearing temperature that solves or partially solves the above-mentioned technical problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A bearing housing for monitoring bearing temperature includes a body with a receiving hole for accommodating the bearing; a plurality of micro-holes penetrating the receiving hole are provided on the outer wall of the body, the diameter of the micro-holes being less than or equal to 0.5 mm; a plurality of mounting seats are provided on the outer wall of the body corresponding to the micro-holes; a fluorescent fiber optic sensor for detecting the temperature of the bearing outer ring is detachably mounted on the mounting seats; the fluorescent fiber optic sensor includes an optical fiber passing through the micro-holes and abutting against the outer ring of the bearing; the fluorescent fiber optic sensor includes a protective sleeve covering the optical fiber, a laser emitting pulsed laser light, and a photodetector for detecting fluorescence intensity; the front part of the optical fiber is coated with a fluorescent coating that fluoresces under the action of the pulsed laser light.

[0008] Preferably, the protective sleeve is covered with a cylindrical fixing block, and the mounting base includes four mounting holes arranged in pairs opposite each other and two clamps made of steel wire. The two legs of the clamps are respectively set in one of the mounting holes, and the middle part of the clamps is bent into an arc shape to fix the fixing block.

[0009] Preferably, the clamp is covered with a plastic sleeve.

[0010] Preferably, an annular rubber buffer pad is provided between the two clamps, and the rubber buffer pad is sleeved on the optical fiber.

[0011] Preferably, the fluorescent fiber optic sensor further includes a prism with a 45° reflective surface in the middle. The reflective surface is coated with a reflective film for reflecting laser light and transmitting fluorescence. The laser is positioned directly opposite the reflective surface at an incident angle of 45°. The photodetector is located at the rear of the prism and perpendicular to the laser. The front of the prism is connected to the optical fiber.

[0012] Preferably, the front part of the prism is coated with a unidirectional film that allows laser to pass through unidirectionally and fluorescence to pass through bidirectionally.

[0013] Preferably, a plurality of micropores are provided on the outer wall of the body, the micropores are equally spaced along the circumference of the outer wall of the body, and the micropores are straight holes along the radial direction of the body.

[0014] The beneficial effects of this invention are as follows: by directly contacting the outer ring of the bearing with a fluorescent fiber optic sensor, the fluorescent material is excited by a laser to emit fluorescence, and the decay time of the fluorescence afterglow is measured by a photodetector and converted into a temperature value; this method can achieve second-level monitoring of the temperature of the outer ring of the bearing; in addition, this invention also uses a clamping structure, which can effectively fix the optical fiber and effectively prevent the optical fiber from loosening due to vibration during operation. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the principle of a fluorescent fiber optic sensor. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below with reference to specific embodiments.

[0017] In the description of this utility model, it should be noted that the terms "inner", "outer", "upper", "lower", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figures 1 to 3 As shown, a bearing housing for monitoring bearing temperature according to this utility model includes a body 10, on which a receiving hole 12 for accommodating the bearing is provided; a plurality of micro-holes (not shown) penetrating to the receiving hole 12 are provided on the outer wall of the body 10, and multiple micro-holes can be equally spaced along the circumference of the outer wall of the body 10 to achieve multi-point monitoring. The micro-holes are straight holes arranged radially along the body 10 to facilitate processing. The diameter of the micro-holes is less than or equal to 0.5 mm, and the diameter of the micro-holes is designed to ensure that the optical fiber (or the fiber core) can pass through smoothly and contact the outer ring of the bearing, while also minimizing the weakening of the structural strength of the bearing housing. A mounting seat 16 is provided at each micro-hole on the outer wall of the body 10, and the mounting seat 16 can be fixed to the body 10 by welding. A fluorescent fiber optic sensor 18 for detecting the temperature of the bearing outer ring is detachably mounted on the mounting seat 16.

[0019] The fluorescent fiber optic sensor 18 includes an optical fiber 20 that passes through a micropore and rests against the outer ring of a bearing; the fluorescent fiber optic sensor 18 includes a protective sleeve 22 covering the optical fiber 20, a laser 24 that emits pulsed laser light, and a photodetector 26 that detects fluorescence intensity; the front part of the optical fiber 20 is coated with a fluorescent coating that emits fluorescence under the action of pulsed laser light.

[0020] A cylindrical fixing block 28 is fitted over the protective sleeve 22. The mounting base 16 includes four mounting holes (not shown) arranged in pairs opposite each other, and two wire clamps 30. The two legs of each clamp 30 are respectively set in one of the mounting holes, and the middle of the clamp 30 is bent into an arc shape to fix the fixing block 28. A plastic sleeve (not shown) is fitted over the clamps 30, and an annular rubber buffer pad 32 is placed between the two clamps 30. The rubber buffer pad 32 is fitted onto the optical fiber 20.

[0021] The fluorescence fiber optic sensor 18 also includes a prism 34, with a 45° reflective surface 36 at its center. The reflective surface 36 is coated with a reflective film (not shown) for reflecting laser light and transmitting fluorescence. The laser 24 is positioned directly opposite the reflective surface 36 at an incident angle of 45°. A photodetector 26 is positioned at the rear of the prism 34 and perpendicular to the laser 24. An optical fiber 20 is connected to the front of the prism 34. The front of the prism 34 is coated with a unidirectional film 38 that allows unidirectional laser light transmission and bidirectional fluorescence transmission.

[0022] The working principle of this invention is as follows: An optical fiber 20 is passed through a micro-hole, with its front end resting against the outer ring of a bearing. Two clamps 30 encircle a fixing block 28, using the elasticity of steel wire to secure the fixing block 28 and prevent the optical fiber 20 from coming out. A plastic sleeve and a rubber buffer pad 32 work together to provide cushioning, reducing the impact of bearing vibration on the fixing block 28 and preventing damage to the optical fiber 20. The pulsed laser emitted by the laser 24 is reflected by the reflective surface 36 and enters the optical fiber 20, exciting the fluorescent coating to emit fluorescence. The fluorescence passes through the optical fiber 20 and the reflective surface 36 and enters the photodetector 26. The photodetector 26 measures the fluorescence, thus determining the decay time of the fluorescence afterglow. The decay time of the fluorescence afterglow varies at different temperatures, therefore the detected decay time can be converted into temperature; this is the principle behind the fluorescence fiber optic sensor 18's temperature detection. Since fluorescence and laser have different wavelengths, designing the unidirectional film 38 and reflective film to meet the requirements of this invention based on wavelength is something that ordinary technicians in the industry can achieve using basic skills. The function of the one-way membrane 38 is to prevent laser reflection from entering the laser 24, which could cause damage or instability to the laser 24. This invention has an accuracy of ±0.5℃, a response speed in the second range, relatively low cost, and allows for online monitoring.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A bearing housing for monitoring bearing temperature, comprising a body, wherein the body is provided with a receiving hole for receiving a bearing; characterized in that: The outer wall of the main body has a plurality of micro-holes penetrating to the receiving hole, the diameter of the micro-holes being less than or equal to 0.5 mm. The outer wall of the main body has a plurality of mounting seats corresponding to the micro-holes. A fluorescent fiber optic sensor for detecting the temperature of the bearing outer ring is detachably mounted on the mounting seats. The fluorescent fiber optic sensor includes an optical fiber passing through the micro-holes and abutting against the outer ring of the bearing. The fluorescent fiber optic sensor includes a protective sleeve covering the optical fiber, a laser emitting pulsed laser light, and a photodetector for detecting fluorescence intensity. The front part of the optical fiber is coated with a fluorescent coating that fluoresces under the action of the pulsed laser.

2. A bearing housing for monitoring bearing temperature according to claim 1, characterized in that, The protective sleeve is covered with a cylindrical fixing block. The mounting base includes four mounting holes arranged in pairs opposite each other and two clamps made of steel wire. The two legs of the clamps are respectively set in one of the mounting holes, and the middle part of the clamps is bent into an arc shape to fix the fixing block.

3. A bearing housing for monitoring bearing temperature according to claim 2, characterized in that, The clamp is covered with a plastic sleeve.

4. A bearing housing for monitoring bearing temperature according to claim 2, characterized in that, An annular rubber buffer pad is provided between the two clamps, and the rubber buffer pad is sleeved on the optical fiber.

5. A bearing housing for monitoring bearing temperature according to claim 1, characterized in that, The fluorescent fiber optic sensor further includes a prism with a 45° reflective surface in the center. The reflective surface is coated with a reflective film for reflecting laser light and transmitting fluorescence. The laser is positioned directly opposite the reflective surface at an incident angle of 45°. The photodetector is located at the rear of the prism and perpendicular to the laser. The front of the prism is connected to the optical fiber.

6. A bearing housing for monitoring bearing temperature according to claim 5, characterized in that, The front part of the prism is coated with a unidirectional film that allows laser to pass through in one direction and fluorescence to pass through in two directions.

7. A bearing housing for monitoring bearing temperature according to claim 1, characterized in that, The outer wall of the body is provided with a plurality of micropores, which are equally spaced along the circumference of the outer wall of the body and are straight holes along the radial direction of the body.

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