阅读说明：本技术 一种测量轴承温度的光纤光栅分布式传感装置及其装配方法和与被测量轴承的方法 (Fiber bragg grating distributed sensing device for measuring bearing temperature, assembly method thereof and method for measuring bearing ) 是由 李光远 胡业发 吴平平 周祖德 陆军 宋春生 刘会涛 杨鹏飞 马振军 吴韩 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种测量轴承温度的光纤光栅分布式传感装置及其装配方法和与被测量轴承的方法；该测量轴承温度的光纤光栅分布式传感装置可用来测量海上工作平台升降系统齿轮箱单元轴承温度,其包括光纤保护外壳、金属基座、毛细管和温度测量光纤,光纤保护外壳上设有多个凹槽,金属基座上设置有基座通孔,温度测量光纤上刻有多个温度测量栅区,该温度测量栅区封装在毛细管中；毛细管封装在金属基座中,金属基座置于光纤保护外壳的部分凹槽内。本发明的传感装置具有测量精度高、结构简单、长期稳定性好、便于拆卸、耐腐蚀性好、抗电磁干扰、易于实现分布式测量且能应用于海工平台齿轮箱轴承的测量等特点。(The invention discloses a fiber bragg grating distributed sensing device for measuring the temperature of a bearing, an assembly method thereof and a method for measuring the temperature of the bearing; the fiber bragg grating distributed sensing device for measuring the bearing temperature can be used for measuring the bearing temperature of a gearbox unit of an offshore working platform lifting system and comprises an optical fiber protective shell, a metal base, a capillary tube and a temperature measuring optical fiber, wherein a plurality of grooves are formed in the optical fiber protective shell, a base through hole is formed in the metal base, a plurality of temperature measuring grid regions are carved on the temperature measuring optical fiber, and the temperature measuring grid regions are packaged in the capillary tube; the capillary is packaged in a metal base, and the metal base is arranged in a part of grooves of the optical fiber protective shell. The sensing device has the characteristics of high measurement precision, simple structure, good long-term stability, convenience in disassembly, good corrosion resistance, electromagnetic interference resistance, easiness in realizing distributed measurement, capability of being applied to measurement of a marine platform gearbox bearing and the like.)

1. The utility model provides a fiber grating distributed sensing device of measurement bearing temperature, has optic fibre protective housing (1), metal base (2), capillary temperature measurement optic fibre (14), its characterized in that: the optical fiber protective shell (1) is provided with a plurality of grooves, and the metal base (2) is provided with a base through hole (7);

a plurality of temperature measuring grid regions (9) are engraved on the temperature measuring optical fiber (14);

the temperature measurement gate (9) is enclosed in the capillary;

the capillary is encapsulated in the metal base (2);

the metal base (2) is arranged in a part of grooves of the optical fiber protective shell (1).

2. The fiber grating distributed sensing device according to claim 1, wherein when the temperature changes, the change of the central wavelength of the temperature measurement gate region (9) satisfies the following conditions:

where xi is the ordinary temperature of the fiber grating, n is the effective refractive index of the grating core, α is the thermal expansion coefficient of the fiber grating, and Δ T is the variation of temperature.

3. The fiber grating distributed sensing device according to claim 1 or 2, further comprising a protective sleeve (10), wherein the temperature measuring optical fiber between two adjacent temperature measuring grid regions (9) is a non-temperature measuring grid region, at least a part of the non-temperature measuring grid region is encapsulated in the protective sleeve (10), and the part of the non-temperature measuring grid region is a part of the temperature measuring optical fiber (14) which is not encapsulated in the capillary.

4. The fiber grating distributed sensing device according to claim 3, wherein the grooves of the fiber protection housing (1) are divided into a square groove (5) and an arc groove (6), the square groove (5) is communicated with the arc groove (6), the metal base (2) is disposed in the square groove (5), and the protection sleeve (10) is disposed in the arc groove (6).

5. The fiber bragg grating distributed sensing device according to claim 4, wherein the square grooves (5) and the arc-shaped grooves (6) are respectively provided in plurality and are sequentially arranged on the fiber protection housing (1) at intervals.

6. The fiber grating distributed sensing device according to claim 4 or 5, wherein the fiber protection housing (1) is further provided with a fiber lead-out channel (3), and the fiber lead-out channel (3) is used for leading out the temperature measurement fiber (14).

7. The fiber grating distributed sensing apparatus of claim 6, wherein the fiber lead-out channel (3) has an arc-shaped cross section to reduce bending of the temperature measuring fiber (14) during lead-out.

8. The fiber grating distributed sensing device according to claim 3, wherein the temperature measuring grid region (9) is packaged in the central region of a capillary tube, the capillary tube is filled with a heat conducting agent (11), and the capillary tube and the protection sleeve (10) are packaged and connected by an epoxy resin glue (12).

9. The fiber grating distributed sensing apparatus of claim 3, wherein the plurality of temperature measurement grating regions (9) engraved on the temperature measurement fiber (14) are all substantially the same material and size.

10. The fiber grating distributed sensing device according to claim 9, wherein the length of the temperature measuring grid region (9) is 10 mm ± 1mm, and the temperature measuring grid region (9) is uncoated.

11. The fiber grating distributed sensing apparatus of any one of claims 1, 2, 4, 7-10, wherein the capillary is a capillary copper tube (8).

12. The fiber grating distributed sensing apparatus of claim 11, wherein the capillary copper tube (8) has an inner diameter of 8 to 1.5 mm.

13. The fiber grating distributed sensing apparatus of claim 12, wherein the capillary copper tube (8) has an inner diameter of 1.2 mm.

14. The fiber grating distributed sensing apparatus of claim 11, wherein the bearing is a bearing of a gearbox unit of an offshore platform hoist system.

15. A method of assembling a fibre grating distributed sensing apparatus for measuring bearing temperature according to any one of claims 3 to 14, wherein: after the temperature measuring grid region (9) is packaged into the capillary tube, the capillary tube is placed in the base through hole (7) of the metal base (2); filling a gap between the capillary tube and the base through hole (7) with a heat conductive agent (11); and after the heat conducting agent (11) is filled, adding a sealing end cover (13) at the position of the base through hole (7), wherein the base through hole (7) and the sealing end cover (13) are connected by adopting epoxy resin glue (12).

16. The assembly method of claim 15, wherein: after the capillary is packaged in the metal base (2), the metal base (2) is placed in a square groove (5) of the optical fiber protective shell (1), and the protective sleeve (10) is placed in an arc-shaped groove (6); the temperature measuring optical fiber (14) is finally led out from the optical fiber leading-out channel (3) of the optical fiber protective shell (1) and then is connected with demodulation equipment.

17. A fiber grating distributed sensing apparatus for measuring bearing temperature and a method of measuring a bearing according to any one of claims 1 to 16, wherein: the optical fiber protective shell (1) is mounted on the inner ring of the outer ring of the bearing to be tested or the outer ring of the inner ring through an optical fiber rotary connector or a bolt.

Technical Field

The invention relates to the field of temperature detection, in particular to a fiber bragg grating distributed sensing device for measuring the temperature of a bearing, which is used for measuring the temperature of the bearing of a gearbox unit of an offshore working platform lifting system.

Background

The marine self-elevating platform is used for offshore operation, and has a complex structure and a huge volume. The platform is often subjected to the action of sea wind, ocean current, tide and the like, the marine corrosion phenomenon is serious, and materials are easy to damage, so that the operation working condition of the platform is far comparable to that of a non-land structure. Therefore, the equipment of the marine elevating platform needs to have higher reliability.

The gear box unit of the marine self-elevating platform lifting system is an essential main unit for connecting and transmitting power in the self-elevating ocean platform and plays a vital role: if the gear box unit breaks down, the down time of the platform working group caused by the failure is long, huge economic loss is caused, and the maintenance cost of the gear box is high, so that the gear box unit monitoring and researching method has very important significance on the monitoring and researching of the marine lifting platform lifting system gear box unit, and the detection of the bearing temperature is an important ring in the marine lifting platform gear box unit detection system.

Further, the bearing is one of the key parts in the marine platform gearbox unit, and its performance directly affects the performance and life of the rotating machine. In the bearing test, a bearing temperature test is one of the main contents of the bearing test. The bearing temperature change gradient has important significance for researching the performances of bearing lubrication, bearing and the like and the service life. The temperature rise and the temperature distribution state of the bearing of the marine gearbox unit directly influence the working performance and the service life of the whole working platform. The continuous increase of the rotating speed of the bearing can cause the friction heat generation of the bearing to increase sharply, and if the heat is not effectively dissipated in time, the temperature in the bearing can be increased abnormally. If the temperature is too high, the surfaces of parts in the bearing are burnt, even glued and seized mutually, and early scrapping is caused, and the consequences are very serious. Particularly, the working temperature of the bearing is abnormally increased due to the rapid increase of the heat generated by friction, the temperature distribution of the bearing of the high-speed shaft of the marine platform gearbox unit is the bearing with the highest rotating speed in the whole gearbox unit and is also the bearing which needs temperature detection most, and reasonable lubrication and cooling can be carried out only by mastering the temperature distribution and the influence thereof in the bearing system under different working conditions. At present, a thermocouple, an infrared temperature sensor or a thermal imaging technology and the like are mostly adopted in the bearing temperature test, and the test is only effective for a static bearing ring. Thermocouple technology cannot be used for testing when the bearing rotates, and infrared and thermal imaging technologies cannot achieve multi-point testing of the rotating bearing ring.

At present, no fiber grating bearing temperature sensing device specially aiming at multi-point testing of the rotating bearing exists, and the fiber grating bearing temperature sensing device is particularly suitable for measuring the temperature of the fiber grating bearing of an offshore working platform.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the fiber bragg grating distributed sensing device for measuring the temperature of the bearing, which is suitable for a maritime work lifting platform. The device overcomes the defects of the prior art, has simple structure, firm installation and convenient assembly and disassembly, and has the advantages of high measurement precision, strong anti-electromagnetic interference capability, strong anti-interference capability and the like. The invention also provides an assembly method of the fiber grating distributed sensing device for measuring the temperature of the bearing, and the fiber grating distributed sensing device for measuring the temperature of the bearing and a method for measuring the bearing.

In order to achieve the purpose, the invention adopts the technical scheme that: a fiber grating distributed sensing device for measuring the temperature of a bearing. The device comprises an optical fiber protective shell, a metal base, a capillary tube and a temperature measuring optical fiber, wherein a plurality of grooves are formed in the optical fiber protective shell, and a base through hole is formed in the metal base; a plurality of temperature measuring grid regions are carved on the temperature measuring optical fiber; the temperature measuring grid region is packaged in the capillary tube; the capillary is encapsulated in the metal base; the metal base is arranged in a part of the groove of the optical fiber protective shell.

Preferably, when the temperature changes, the change of the central wavelength of the temperature measuring grid region satisfies the following conditions:

where xi is the ordinary temperature of the fiber grating, n is the effective refractive index of the grating core, α is the thermal expansion coefficient of the fiber grating, and Δ T is the variation of temperature.

Preferably, the fiber grating distributed sensing device for measuring the temperature of the bearing further comprises a protective sleeve, the temperature measuring optical fiber between two adjacent temperature measuring grid regions is a non-temperature measuring grid region, at least part of the non-temperature measuring grid region is packaged in the protective sleeve, and the part of the non-temperature measuring grid region is a part of the temperature measuring optical fiber which is not packaged in the capillary; furthermore, a plurality of temperature measuring grid regions are directly engraved on a long temperature measuring optical fiber instead of being connected in series in a single grid region fusion mode, so that the loss of the optical fiber during working can be greatly reduced; thereby realizing distributed multipoint measurement; and the material and dimensions of all the temperature measuring gate regions are substantially the same.

Preferably, the groove of the optical fiber protective shell is divided into a square groove and an arc-shaped groove, the square groove is communicated with the arc-shaped groove, the metal base is arranged in the square groove, and the protective sleeve is arranged in the arc-shaped groove; furthermore, square recess and arc recess are a plurality of respectively, and set up on optic fibre protective housing at interval in proper order.

Preferably, the optical fiber protective casing is further provided with an optical fiber lead-out channel, and the optical fiber lead-out channel is used for leading out the temperature measurement optical fiber.

Preferably, the cross section of the fiber leading-out channel is arc-shaped, so that the bending degree of the temperature measuring fiber during leading-out is reduced, and the optical loss of the fiber sensor is minimized as much as possible.

Preferably, the length of the temperature measurement gate region is 10 ± 1mm, and the temperature measurement gate region has no coating layer to reduce the low-temperature chirp phenomenon of the fiber grating caused by the non-uniform distribution of strain in the grating region, the temperature measurement gate region is encapsulated in the central region of the capillary tube, and the capillary tube is filled with a heat-conducting agent to ensure the uniformity and stability of the heat transfer process. And the optical fiber outside the capillary tube is packaged by a protective sleeve, and the capillary tube and the protective sleeve are packaged and connected by epoxy resin glue.

Preferably, the capillary tube is a capillary copper tube.

Preferably, the capillary copper tube has an internal diameter of 8 to 1.5mm, preferably 1.2 mm. The capillary is too small to be sleeved by the optical fiber easily; if the size of the optical fiber grating area is too large, the sealing performance and the stability of the optical fiber grating area after dispensing can be reduced, and the length of the optical fiber grating area is larger than that of the optical fiber grating area, so that the grating area is completely sealed in the optical fiber grating area; when the temperature measurement gate region is packaged in the capillary copper tube, the temperature measurement gate region is kept in a loose state, and the influence of strain on the temperature measurement gate region caused by deformation of the capillary copper tube due to heating is avoided.

Preferably, the bearing is a bearing of a gearbox unit of an offshore work platform hoist system.

Furthermore, the protective sleeve has corrosion resistance, is preferably made of radiation cross-linked special fluorine-containing polymer PVDF with the shrinkage ratio of 2:1, has excellent chemical corrosion resistance and solvent resistance, has good insulating property, ensures the sealing property of the optical fiber, isolates liquid, and prevents the optical fiber from being corroded due to the direct contact of the corrosive liquid.

According to another aspect of the invention, a method of assembling a fiber grating distributed sensing apparatus for measuring bearing temperature is provided. The method specifically comprises the following steps: packaging the temperature measuring grid region into a capillary tube, and placing the capillary tube in a base through hole of a metal base; filling a heat-conducting agent in a gap between the capillary tube and the through hole of the base; after the heat conducting agent is filled, in order to prevent the heat conducting agent from leaking, a sealing end cover is added at the through hole of the base, and the through hole of the base and the sealing end cover are connected by epoxy resin glue.

Further, after the capillary tube is packaged into the metal base, the metal base is placed in the square groove of the optical fiber protective shell, and the protective sleeve is placed in the arc groove; the temperature measuring optical fiber is finally led out from the optical fiber leading-out channel of the optical fiber protective shell and then connected with a demodulator or other demodulation equipment.

According to another aspect of the invention, a fiber grating distributed sensing device for measuring the temperature of a bearing and a method for measuring the bearing are provided, wherein a fiber protection shell is mounted on an inner ring of an outer ring of the measured bearing or an outer ring of the inner ring through a fiber rotary connector or a bolt.

Further, when the optical fiber protective shell is connected with a bearing to be measured through bolts, two M4.0 bolt holes and three M3.0 bolt holes are formed in the optical fiber protective shell, the bolt holes with the same size are formed in the corresponding positions of the bearing to be measured, and the arc-shaped groove is avoided when the hole is formed in the optical fiber protective shell by paying attention to the hole forming position of the bolt holes of M3. The fiber grating distributed device is not connected with the bearing in a cementing mode, but the metal base is fixed by the fiber protection shell. The protective shell and the bearing to be measured are connected through the bolts, so that the whole device is more stable, has longer service life and has the characteristic of convenience in disassembly. The installation scheme overcomes the influence of the rotation splashing of the lubricating oil to the sensor when the maritime work lifting platform heavy-duty bearing works, and the measurement result is more accurate.

Compared with the prior art, the fiber bragg grating distributed sensing device for measuring the temperature of the bearing, disclosed by the invention, has the following beneficial effects:

1. traditional fiber grating bearing sensor is all to carry out fluting on the axle bush and handles pre-buried sensor or directly paste on the bearing frame, and the operation degree of difficulty is comparatively complicated on the one hand, and the feasibility is low, and can't dismantle the change, and on the other hand is too far away from the bearing, and there is very big deviation in the data of measurement gained. The sensing device provided by the invention does not need pre-buried operation treatment, only the groove and the fixing bolt hole are formed in the inner ring of the bearing outer ring, the whole set of equipment can be stably and conveniently installed, and the temperature measuring device is directly arranged on the bearing outer ring, so that the result is more accurate compared with the traditional bearing temperature sensor.

2. The sensing device of the invention has thorough isolation to stress, and the temperature measurement grid region keeps a relaxed state in the capillary, so as to prevent the influence of the strain generated by heating the capillary on the temperature measurement grid region. Furthermore, when the capillary tube is packaged in the metal base, the capillary tube is not in direct contact with the metal base, and the heat conducting agent is filled in the middle of the capillary tube, so that heat transfer is more uniform.

In conclusion, the sensing device has the characteristics of high measurement precision, simple structure, good long-term stability, convenience in disassembly, good corrosion resistance, electromagnetic interference resistance, easiness in realizing distributed measurement and capability of being applied to the marine platform gearbox bearing.

The invention is described in further detail below with reference to the figures and specific embodiments.

Drawings

FIG. 1 is a schematic view of a high-speed shaft bearing slot of a gearbox of a marine platform under test;

FIG. 2 is a general schematic view of the fiber optic protective housing of the present invention;

FIG. 3 is a partial cross-sectional view of a fiber optic protective enclosure of the present invention;

FIG. 4 is a metal base of the present invention;

FIG. 5 is a seal end cap of the present invention;

FIG. 6 is a schematic view of the package of the temperature measuring fiber grating region of the present invention;

FIG. 7 is a schematic view of a capillary copper tube package according to the present invention;

FIG. 8 is a schematic view of the installation of the metal base and end cap of the present invention;

figure 9 is a schematic view of the installation of the complete device on the bearing,

figure 10 is a schematic view of the mounting of the bearing on the marine platform gearbox unit.

In the figure: optical fiber protective housing 1, metal base 2, optical fiber derivation channel 3, bolt fixing hole 4, square groove 5, arc-shaped groove 6, base through hole 7, capillary copper pipe 8, temperature measurement grid 9, protective sleeve 10, heat conducting agent 11, epoxy resin glue 12, sealing end cover 13, temperature measurement optical fiber 14, demodulator 15, computer 16, bearing G

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout, as in the following embodiments, the capillary tube is embodied by a capillary copper tube 8. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 1 to 10, a fiber grating distributed sensing apparatus for measuring a temperature of a bearing, a method for assembling the same, and a method for measuring a bearing according to the present invention will be described in further detail with reference to the following examples, but embodiments of the present invention are not limited thereto.

Example 1:

as shown in fig. 1, the bearing to be measured is 6411E deep groove ball bearing G, which is also a type of marine elevating platform gearbox unit parallel gearbox high speed shaft bearing. The inner ring of the bearing to be measured is connected with the high-speed gear shaft, the inner ring of the bearing rotates along with the high-speed gear shaft, the outer ring of the bearing is connected with the gearbox body, and the outer ring of the bearing is static.

As shown in fig. 1-8, the device comprises an optical fiber protective casing 1, a metal base 2, a capillary copper tube 8 and a temperature measuring optical fiber 14, wherein a plurality of grooves are arranged on the optical fiber protective casing 1, and a base through hole 7 is arranged on the metal base 2; a plurality of temperature measuring grid regions 9 are engraved on the temperature measuring optical fiber 14; the temperature measuring grid region 9 is packaged in the capillary copper tube 8; the capillary copper pipe 8 is packaged in the metal base 2; the metal base 2 is arranged in a partial groove of the optical fiber protective shell 1.

As shown in fig. 2, the grooves of the optical fiber protective housing 1 are divided into a square groove 5 and an arc groove 6, the square groove 5 is communicated with the arc groove 6, the metal base 2 is arranged in the square groove 5, and the protective sleeve is arranged in the arc groove 6; further, a plurality of square grooves 5 and arc grooves 6 are respectively arranged on the optical fiber protective casing 1 at intervals in sequence.

As shown in fig. 3, the optical fiber protective casing 1 is further provided with an optical fiber leading-out channel 3, the optical fiber leading-out channel 3 is used for leading out the temperature measurement optical fiber 14, and the cross section of the optical fiber leading-out channel 3 is arc-shaped, so as to reduce the bending degree of the temperature measurement optical fiber 14 during leading-out, and minimize the optical loss of the optical fiber sensor.

Preferably, when the temperature changes, the change of the central wavelength of the temperature measurement gate region 9 satisfies:

where xi is the ordinary temperature of the fiber grating, n is the effective refractive index of the grating core, α is the thermal expansion coefficient of the fiber grating, and Δ T is the variation of temperature.

As shown in fig. 6, the fiber grating distributed sensing device for measuring the temperature of the bearing further includes a protective sleeve 10, the temperature measuring fiber 14 between two adjacent temperature measuring gate regions 9 is a non-temperature measuring gate region 9, at least a part of the non-temperature measuring gate region 9 is packaged in the protective sleeve 10, and the part of the non-temperature measuring gate region 9 is a part of the temperature measuring fiber 14 which is not packaged in the capillary copper tube 8; furthermore, a plurality of temperature measuring grid regions 9 are directly engraved on a long temperature measuring optical fiber 14, and are not connected in series in a single grid region fusion mode, so that the loss of the optical fiber in work can be greatly reduced; thereby realizing distributed multipoint measurement; and the material and dimensions of all the temperature measuring gate regions 9 are substantially the same.

As shown in fig. 6, the length of the temperature measurement gate region 9 should be 10 ± 1mm, and the temperature measurement gate region 9 has no coating layer to reduce the low-temperature chirp phenomenon of the fiber grating caused by the non-uniform distribution of the strain in the grating region, the temperature measurement gate region 9 is packaged in the central region of the capillary copper tube 8, and the capillary copper tube 8 is filled with a heat conducting agent 11 to ensure the uniformity and stability of the heat transfer process. The optical fiber outside the capillary copper tube 8 is packaged by a protective sleeve 10, and the capillary copper tube 8 and the protective sleeve 10 are packaged and connected by epoxy resin glue 12. The capillary copper tube 8 has an internal diameter of 8 to 1.5mm, preferably 1.2 mm. The capillary copper tube 8 is too small to be sleeved by the optical fiber easily; if the size of the optical fiber grating area is too large, the sealing performance and the stability of the optical fiber grating area after dispensing can be reduced, and the length of the optical fiber grating area is larger than that of the optical fiber grating area, so that the grating area is completely sealed in the optical fiber grating area; when the temperature measurement grid region 9 is packaged in the capillary copper tube 8, the relaxation state is kept, the phenomenon that the capillary copper tube 8 is deformed due to heating to cause the temperature measurement grid region 9 to be influenced by strain is avoided, and the problem of cross sensitivity of temperature strain in the process of measuring the temperature of the bearing is solved.

As shown in fig. 6, the protective sleeve 10 has corrosion resistance, is preferably made of radiation cross-linked special fluoropolymer PVDF with a shrinkage ratio of 2:1, has excellent chemical corrosion resistance and solvent resistance, has good insulation, ensures the sealing performance of the optical fiber, isolates liquid, and prevents the corrosive liquid from directly contacting and corroding the optical fiber.

As shown in fig. 7 and 8, according to another aspect of the present invention, there is provided a method of assembling a fiber grating distributed sensing apparatus for measuring a temperature of a bearing. The method specifically comprises the following steps: after the temperature measuring grid region 9 is packaged into the capillary copper tube 8, the capillary copper tube 8 is placed in the base through hole 7 of the metal base 2; filling a heat-conducting agent 11 in a gap between the capillary copper tube 8 and the through hole 7 of the base; after the heat conducting agent 11 is filled, in order to prevent the heat conducting agent 11 from leaking, a sealing end cover 13 is added at the through hole 7 of the base, the through hole 7 of the base and the sealing end cover 13 are connected by epoxy resin glue 12, after the capillary copper tube 8 is packaged into the metal base 2, the metal base 2 is placed in the square groove 5 of the optical fiber protective shell 1, and the protective sleeve 10 is placed in the arc-shaped groove 6; the temperature measuring optical fiber 14 is finally led out from the optical fiber leading-out channel 3 of the optical fiber protective shell 1, then is connected with a demodulator 15 or other demodulation equipment, and then is connected with a computer 16.

According to another aspect of the present invention, as shown in fig. 9 and 10, there is provided a fiber grating distributed sensing apparatus for measuring bearing temperature and a method for measuring a measured bearing, wherein a fiber protection housing 1 is mounted on an inner ring of an outer ring or an outer ring of an inner ring of a measured bearing through a fiber rotary connector or a bolt, when the fiber protection housing 1 is bolted to the measured bearing, two M4.0 and three M3.0 bolt holes are formed in the fiber protection housing 1, the same size bolt holes are formed in corresponding positions of the measured bearing, and when the fiber protection housing 1 is holed, the hole punching position of the bolt holes of M3 should be kept away from the arc-shaped groove 6. The fiber grating distributed device is not connected with a bearing in a gluing mode, but the fiber grating distributed device is fixed on a metal base 2 by the fiber protection shell 1. The protective shell and the bearing to be measured are connected through the bolts, so that the whole device is more stable, has longer service life and has the characteristic of convenience in disassembly. The installation scheme overcomes the influence of the rotation splashing of the lubricating oil to the sensor when the maritime work lifting platform heavy-duty bearing works, and the measurement result is more accurate.

Example 2:

the embodiment is further optimized on the basis of the above embodiment, if the outer ring of the bearing to be measured is in a rotating state, the optical fiber rotary connector suitable for measuring the temperature of the rotating object can be connected to the jumper wire led out from the optical fiber jumper wire outlet 3, and the temperature measurement of the rotating outer ring of the bearing can be completed.

Example 3;

the embodiment is further optimized on the basis of the embodiment, if the inner ring of the outer ring of the measured bearing cannot be installed with the fiber grating distributed device due to the limitation of the conditions such as space, material and the like, the device can be installed on the outer ring of the inner ring of the measured bearing by properly modifying the structure of the first example, and the working principle of the device is the same as that of the first example.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.