Rolling mill bearing miniature temperature monitoring device based on thread sealing

Abstract

The utility model provides a rolling mill bearing miniature temperature monitoring device based on thread sealing, comprising a miniature temperature sensor, the miniature temperature sensor is installed in an oil hole of a lubricating oil groove on a bearing outer ring, a sensor installation thread is processed in the oil hole of the lubricating oil groove, and the miniature temperature sensor is fixed in the oil hole through threaded connection; four lead grooves are formed in the inner ring of the bearing seat along the axis, a signal transmission line of the micro temperature sensor is led out from the lead grooves, and the leading-out end of the signal transmission line is connected to signal acquisition equipment; and temperature calibration is carried out on the miniature temperature sensor (2) before use. According to the device, the sensor and the bearing are integrated through the structural design of the embedded microsensor, a high-temperature-resistant fixing mode is adopted, long-term stable temperature measurement can be achieved under the high-temperature, high-humidity and high-speed rolling working conditions, the running temperature change of the rolling mill bearing can be monitored in real time, and multi-source dynamic data support is provided for fault early warning and service life prediction of the rolling mill bearing.

Description

Technical Field

[0001] This utility model relates to the field of mechanical condition monitoring technology, and in particular to a micro temperature monitoring device for rolling mill bearings based on threaded seals. Specifically, it is a real-time temperature sensing and early warning device integrated into a key position of the rolling mill bearing body, suitable for rolling conditions such as high speed, high temperature, and heavy load. Background Technology

[0002] The operating temperature of rolling mill bearings is a key parameter reflecting their working condition, and a reasonable temperature range is a prerequisite for ensuring stable operation of rolling mill bearings. Under high-speed, high-temperature, and heavy-load rolling conditions, bearings are prone to excessive temperature rise due to frictional heating, lubrication failure, or abnormal rolling force distribution. If not monitored in time, this can lead to failures such as wear of bearing rolling elements, cage deformation, and even raceway burning, causing sudden shutdowns of the rolling equipment and severely affecting production continuity. In addition, uneven temperature distribution may exacerbate bearing component wear, shorten service life, increase maintenance costs, and even induce chain damage such as roll burning and corrosion, threatening the safety of the entire machine.

[0003] Currently, rolling mill bearing temperature monitoring primarily employs external contact sensors or non-contact infrared thermometers. External contact sensors are typically installed on the bearing housing surface or in the lubrication oil lines. Due to the difference in conduction paths between the measurement location and the internal heat source of the bearing, the monitoring results are delayed and lack accuracy. Non-contact infrared thermometers are susceptible to interference from oil, water mist, or vibration, making stable operation difficult under complex conditions. Furthermore, existing methods cannot achieve direct embedded temperature measurement in critical areas of the bearing body (such as raceways and cages), and most solutions require shutdown for installation or periodic maintenance, failing to meet the rolling mill's need for real-time temperature monitoring during continuous rolling. Shutdown inspections not only reduce production efficiency but may also lead to serious accidents due to the failure to provide timely warnings of abnormal temperatures. Utility Model Content

[0004] To address the problems of lubrication failure and raceway spalling in rolling mill bearings caused by abnormal temperatures under high-speed, high-temperature, and heavy-load rolling conditions, this invention provides a miniature temperature monitoring device for rolling mill bearings based on threaded seals. This device can be directly integrated into the inside of the rolling mill bearing or bearing housing to monitor temperature changes in real time, enabling fault warnings and life prediction for the rolling mill bearing, thereby extending bearing life and ensuring stable operation of the rolling mill. The technical means employed in this invention are as follows:

[0005] A micro temperature monitoring device for rolling mill bearings based on threaded seals, characterized in that it includes: a micro temperature sensor (2), wherein the micro temperature sensor (2) is installed in the oil hole of the lubricating oil groove (1) on the outer ring (3) of the bearing, the oil hole of the lubricating oil groove (1) is machined with a sensor mounting thread, and the micro temperature sensor (2) is fixed in the oil hole by threaded connection; four lead wire grooves are opened along the axis on the inner ring of the bearing seat (5), and the signal transmission line (4) of the micro temperature sensor (2) is led out from the lead wire grooves, and the lead end of the signal transmission line (4) is connected to a signal acquisition device; the micro temperature sensor (2) is calibrated for temperature before use.

[0006] Furthermore, the miniature temperature sensor (2) is a probe-type temperature sensor with a probe diameter of Φ5mm, a range of -50~800℃, a detection accuracy of ≤±0.5℃, a protection level of IP68, and a response time of <1s.

[0007] Furthermore, the miniature temperature sensor (2) has mounting threads, and the mounting threads of the sensor (2) are connected to the mounting threads in the oil hole of the lubricating oil groove (1). The bottom probe portion of the sensor (2) is coated with thermally conductive silicone grease.

[0008] Furthermore, the depth of the sensor mounting thread in the oil hole of the lubricating oil groove (1) extends by 0.1-0.3 mm compared to the length of the sensor (2), and the inner wall of the oil hole is coated with an aluminum oxide insulating layer.

[0009] Furthermore, eight miniature temperature sensors (2) are evenly distributed circumferentially on the two lubricating oil tanks (1), and the maximum value of the temperature detected by each sensor is taken as the alarm threshold during monitoring.

[0010] Furthermore, before use, the miniature temperature sensor (2) is calibrated by simulating the working temperature gradient using a constant-temperature metal plate.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. Precise monitoring: Miniature temperature sensors are directly embedded in key areas of heat conduction in rolling mill bearings to provide real-time feedback on temperature field distribution and identify local overheating or poor lubrication;

[0013] 2. Resistant to harsh environments: IP68 protection rating and high-temperature resistant bolt design, resistant to rolling mill vibration, oil stains and cooling water corrosion;

[0014] 3. Dynamic calibration: By simulating the temperature gradient of the working condition through a constant-temperature metal plate, the nonlinear error of the sensor is corrected, and the long-term stability is improved by more than 30%.

[0015] 4. Easy maintenance: The sensor and bolt are integrated into one design, supporting online replacement without disassembling the main bearing structure.

[0016] Based on the above reasons, this utility model can be widely promoted in fields such as rolling mill equipment condition monitoring. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and the embodiments in the accompanying drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a micro temperature monitoring device for rolling mill bearings based on threaded seals according to this utility model.

[0019] Figure 2 This is a schematic diagram showing the machining position of the bearing housing and its lead wire groove in this utility model.

[0020] Figure 3 This is a schematic diagram of the sensor structure in this utility model.

[0021] Figure 4 This is a partially enlarged view of the signal transmission line lead-out method of a micro temperature monitoring device for rolling mill bearings based on threaded seals according to this utility model.

[0022] In the diagram: 1. Lubricating oil groove; 2. Miniature temperature sensor; 3. Bearing outer ring; 4. Signal transmission line; 5. Bearing housing. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] This invention provides a miniature temperature monitoring device for rolling mill bearings based on threaded seals, including a miniature temperature sensor 2 embedded in the oil holes of the lubricating oil groove 1 on the outer ring 3 of the bearing. The oil holes in the lubricating oil groove 1 on the outer ring 3 of the bearing have several circumferentially distributed holes, eight of which are machined with sensor mounting threads. The sensor 2 is fixed in the mounting groove via a threaded connection. A signal transmission line 4 is led out from the top of the sensor, passes through the oil holes, and extends along the lead wire groove of the inner ring of the bearing housing 5 to an external acquisition module. The sensor 2 is calibrated and verified for temperature before use. This invention can stably monitor bearing temperature for a long time under high temperature and high vibration conditions, and provide real-time early warning of abnormal temperature rises.

[0025] As a preferred embodiment, the miniature temperature sensor 2 is a probe-type temperature sensor with a probe diameter of Φ5mm, a range of -50~800℃, a detection accuracy of ≤±0.5℃, a protection level of IP68, and a response time of <1s; the sensor (2) has mounting threads, and the mounting threads of the sensor 2 are connected to the mounting threads in the oil hole of the lubricating oil groove 1; the bottom probe part of the sensor 2 is coated with thermally conductive silicone grease.

[0026] In a preferred embodiment, the width of the sensor mounting groove is 2-3 times the diameter of the sensor probe, and the depth is 0.1-0.3 mm greater than the thickness of the sensor; the inner wall of the mounting groove is coated with an aluminum oxide insulating layer (50 μm thick), and the threaded hole at the bottom of the groove is M1.6-M3.

[0027] In a preferred embodiment, the lead groove of the bearing housing 5 has a width of 4-6mm and a depth of 2-4mm. After the signal transmission line 4 passes through, it is wrapped with a high-temperature resistant silicone sleeve to avoid friction with the moving parts of the bearing.

[0028] In a preferred embodiment, eight sensors 2 are evenly distributed circumferentially in the two lubricating oil tanks 1, and the maximum value of the temperature detected by each sensor is taken as the alarm threshold during monitoring.

[0029] Taking a four-row cylindrical roller bearing for a rolling mill as an example, the oil hole of the outer ring 3 of the bearing is located in the non-load-bearing area of ​​the raceway, and the oil hole of the middle retaining ring 1 avoids the bolt connection area; during installation, the tightening torque of the sensor 2 is 1.0-1.5 N·m to ensure close contact with the mounting thread in the oil hole.

[0030] It should be noted that if the bearing has a split structure, the lead groove needs to be processed in sections and connected to the signal line through a flexible sheath. Example

[0031] An embedded temperature monitoring device for bearings, such as Figure 1-3As shown, it is applied to the bearing of the rolling mill support roll. The sensor (2) is a probe-type temperature sensor with a probe diameter of Φ5mm and a range of -50~300℃; eight miniature temperature sensors (2) are evenly distributed around the lubricating oil groove (1), for a total of eight measuring points. The signal transmission line (4) is led out along the inner ring lead groove (5mm wide and 3mm deep) of the bearing seat (5) to the external acquisition module.

[0032] Before installation, the sensor was calibrated using a 60×60×6mm GCr15 steel constant-temperature metal plate: heated to 50℃, 100℃, 150℃, 200℃, and 250℃. After calibration, the long-term stability error was ≤0.3℃. During installation, the high-temperature resistant bolts were tightened to a torque of 1.2 N·m, ensuring no interference after the signal cable was fixed.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify or make equivalent substitutions to the technical solutions of the foregoing embodiments, and such modifications or substitutions all fall within the protection scope of this utility model.

Claims

1. A miniature temperature monitoring device for rolling mill bearings based on threaded seals, characterized in that, include: A miniature temperature sensor (2) is installed in the oil hole of the lubricating oil groove (1) on the outer ring (3) of the bearing. The oil hole of the lubricating oil groove (1) is machined with a sensor mounting thread. The miniature temperature sensor (2) is fixed in the oil hole by the threaded connection. Four lead wire grooves are opened along the axis on the inner ring of the bearing seat (5). The signal transmission line (4) of the miniature temperature sensor (2) is led out from the lead wire groove. The lead end of the signal transmission line (4) is connected to the signal acquisition device. The miniature temperature sensor (2) is calibrated before use.

2. The micro temperature monitoring device for rolling mill bearings based on threaded seals according to claim 1, characterized in that, The miniature temperature sensor (2) is a probe-type temperature sensor with a probe diameter of Φ5mm, a range of -50~300℃, a detection accuracy of ≤±0.5℃, a protection level of IP68, and a response time of <1s.

3. The micro temperature monitoring device for rolling mill bearings based on threaded seals according to claim 2, characterized in that, The miniature temperature sensor (2) has mounting threads, which are connected to the mounting threads in the oil hole of the lubricating oil groove (1). The bottom probe portion of the miniature temperature sensor (2) is coated with thermally conductive silicone grease.

4. The micro temperature monitoring device for rolling mill bearings based on threaded seals according to claim 1, characterized in that, The depth of the sensor mounting thread in the oil hole of the lubricating oil groove (1) is 0.1-0.3 mm longer than the length of the miniature temperature sensor (2), and the inner wall of the oil hole is coated with an aluminum oxide insulating layer.

5. A micro temperature monitoring device for rolling mill bearings based on threaded seals according to claim 1, characterized in that, Eight miniature temperature sensors (2) are evenly distributed circumferentially on the two lubricating oil tanks (1). During monitoring, the maximum value of the temperature detected by each sensor is taken as the alarm threshold.

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