Double-roller dry oil lubricating device with friction coefficient feedback

Abstract

The utility model relates to the technical field of roller equipment, in particular to a roller grease lubrication device with friction coefficient feedback, which comprises a bottom frame, bearing seats are respectively arranged on two sides of the bottom frame corresponding to two ends of each roller, a bearing hole is respectively arranged in each bearing seat, and an external oil duct corresponding to the bearing hole is arranged outside each bearing seat; the induction sleeve is arranged in the bearing hole in a matched mode, a strain type friction force sensor is arranged between the bearing seat and the induction sleeve, and an inner oil channel is formed in the position, corresponding to the outer oil channel, of the inner wall of the induction sleeve; the main bearings are arranged in the induction sleeves, and all the rollers are matched with the corresponding main bearings through roller necks at the two ends; and the oil pump is fixedly arranged on the bottom frame, and the output end of the oil pump communicates with the external oil duct through a high-pressure pipe. Lubricating agent filling is dynamically adjusted by monitoring the friction coefficient in real time, on-demand lubrication of a bearing and a roll neck of roll equipment is achieved, and an accurate, efficient and low-consumption lubrication solution is provided for the equipment.

Description

Technical Field

[0001] This utility model relates to the field of roller equipment technology, and specifically to a roller dry oil lubrication device with friction coefficient feedback. Background Technology

[0002] In heavy industries such as metallurgy, mining, and papermaking, roller conveyors are core transmission components, and the lubrication status of their bearings and roller necks directly affects the equipment's lifespan and operating efficiency. Traditional timed and quantitative lubrication methods have significant drawbacks: on the one hand, fixed lubrication cycles cannot adapt to changes in load, speed, and temperature, easily leading to insufficient lubrication ("under-lubrication"), causing dry friction, abnormal wear, and even sintering failures in the friction pair; on the other hand, excessive grease application ("over-lubrication") not only wastes grease but can also cause contamination or poor heat dissipation due to seal failure. While existing technologies attempt to monitor lubrication status through indirect parameters such as vibration and temperature, they cannot directly reflect the true lubrication needs of the friction interface, exhibiting lag and insufficient accuracy. Therefore, an intelligent lubrication technology based on real-time feedback of the friction coefficient is urgently needed. By directly measuring the dynamic friction coefficient during roller transmission, the lubrication film status can be accurately characterized, and this feedback can be used to control the amount and frequency of lubricant application, achieving "on-demand lubrication." Utility Model Content

[0003] This invention provides a dry oil lubrication device for rollers with friction coefficient feedback. By monitoring the friction coefficient in real time, it dynamically adjusts the lubricant supply, realizing "on-demand lubrication" of the bearings and roller necks of the roller equipment, and providing the equipment with a precise, efficient and low-consumption lubrication solution.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a dry oil lubrication device for rollers with friction coefficient feedback, wherein the rollers consist of a pair of parallel rollers, comprising: a base frame, bearing seats on both sides of the base frame corresponding to the two ends of each roller, bearing holes in each bearing seat, and an external oil passage corresponding to the bearing holes on the outside of the bearing seat; a sensing sleeve, which fits inside the bearing holes, and a strain-type friction sensor is provided between the bearing seat and the sensing sleeve, and an internal oil passage corresponding to the external oil passage is provided on the inner wall of the sensing sleeve; a main bearing, which is disposed inside the sensing sleeve, and each roller engages with the corresponding main bearing through roller necks at both ends; an oil pump, which is fixedly mounted on the base frame, and the output end of the oil pump is connected to the external oil passage through a high-pressure pipe, and the input end of the oil pump is connected to an oil tank through a low-pressure pipe; and a controller, which is fixedly mounted on the base frame, and the strain-type friction sensor and the oil pump are electrically connected to the controller.

[0005] Preferably, each of the sensing sleeves has a first swing arm radially arranged at the end away from the roller; each of the bearing seats has a support platform on one side corresponding to the first swing arm, and the strain-type friction sensor is fixedly arranged on one side of the support platform and corresponds to the first swing arm.

[0006] Preferably, each of the sensing sleeves is provided with a second swing arm on the side away from the first swing arm; each of the bearing seats is provided with a constraint platform on both sides of the second swing arm, and each of the constraint platforms is provided with a buffer block on the side of the second swing arm.

[0007] Preferably, each of the sensing sleeves is provided with an oil seal that mates with the roller neck at one end, and each of the sensing sleeves is provided with a bearing cap at its outer end; the main bearings are arranged in pairs at intervals; the internal oil passage includes a first oil supply passage between two main bearings and a first oil discharge passage outside the two main bearings; the external oil passage includes a second oil supply passage corresponding to the first oil supply passage and a second oil discharge passage corresponding to the first oil discharge passage, the second oil supply passage being connected to the output end of the oil pump, and the second oil discharge passage being connected to the oil tank.

[0008] The beneficial effects of this invention are as follows: This technical solution dynamically adjusts lubricant supply by real-time monitoring of the friction coefficient, achieving "on-demand lubrication" of the bearings and roller necks of the roller equipment. When the rollers operate, frictional torque is generated between the roller neck and the main bearing, which is transmitted to the sensing sleeve through the main bearing. The sensing sleeve converts the torque into a circumferential force through the first swing arm, acting on the strain gauge friction sensor. The sensor converts the mechanical signal into an electrical signal, providing real-time feedback on the change in friction coefficient to the controller. The friction coefficient directly reflects the state of the lubrication film: an increased friction coefficient indicates insufficient surface lubrication; a decreased friction coefficient indicates good lubrication. The controller sets a threshold based on the friction coefficient and dynamically adjusts the start and stop of the oil pump. When the friction coefficient exceeds the threshold, the controller starts the oil pump, and high-pressure grease forms a lubrication film through the external oil passage, internal oil passage, and main bearing friction pair; oil supply stops when the friction coefficient returns to normal. This setting overcomes the hysteresis of traditional indirect parameters by directly measuring the friction coefficient, achieving closed-loop control of "friction state and lubrication amount," reducing lubrication error by more than 50%. In addition, the non-invasive design of the strain gauge sensor avoids damage to the bearing housing structure and is resistant to heavy industrial vibration environments. The design of the induction sleeve and bearing housing balances torque transmission and sealing to prevent dust intrusion. The controller can integrate a PLC or industrial IoT platform, supporting remote monitoring of lubrication data and predictive maintenance cycles. The oil pump selection is flexible and adaptable to different viscosities of grease. This structure, through the coordinated design of the second swing arm, constraint platform, and buffer block, primarily addresses the oscillation stability issue of the induction sleeve during torque transmission. The first swing arm transmits the frictional torque of the main bearing to the strain gauge sensor, forming the active measurement side; the second swing arm, symmetrically arranged on the other side, forms a physical elastic limit with the buffer block on the constraint platform, counteracting the reverse oscillation of the induction sleeve caused by torque, thus forming the passive constraint side. This avoids unilateral load on the induction sleeve, ensuring torque measurement accuracy error <±2%. This structure, through a multi-channel oil circuit design and grouped layout of the main bearings, achieves directional lubrication and waste oil recovery for the roller neck bearings. Its working principle can be divided into three parts: lubrication supply, oil circuit circulation, and sealing protection. The high-pressure oil supply path is as follows: oil pump, high-pressure pipe, second oil supply channel, first oil supply channel, and the gap between the two main bearings. Its function is to inject high-pressure grease from the center of the bearing, using centrifugal force to diffuse it to both sides, ensuring a uniform lubricating film covering the rolling elements. The main bearings are arranged in pairs with increased spacing: this avoids short-path leakage of grease and extends its residence time. When the friction coefficient sensor detects insufficient lubrication, the controller starts the oil pump, and high-pressure grease preferentially fills the bearing gaps, forming a core lubrication zone. The waste oil recovery path is as follows: outside the main bearing, first oil drain, second oil drain, and oil tank. Its function is to use centrifugal force to throw aged grease and wear debris to the outside of the bearing, returning them to the oil tank for filtration and reuse, reducing contamination. This design, through zoned high-pressure oil circuits and a closed-loop recovery system, achieves precise lubrication, waste oil resource utilization, and lightweight maintenance. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a partial structural cross-sectional view of the present invention.

[0012] In the diagram: 1. Base frame; 2. Roller; 3. Bearing housing; 4. Sensing sleeve; 5. Strain gauge friction sensor; 6. Main bearing; 7. Roller neck; 8. Oil pump; 9. Oil tank; 10. First swing arm; 11. Support platform; 12. Second swing arm; 13. Constraint platform; 14. Buffer block; 15. Oil seal; 16. Bearing cover; 17. First oil supply channel; 18. Second oil supply channel; 19. First oil discharge channel; 20. Second oil discharge channel. Detailed Implementation

[0013] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] according to Figure 1 , Figure 2As shown, a dry oil lubrication device for rollers with friction coefficient feedback is disclosed. The rollers consist of a pair of parallel rollers 2. The device includes: a base frame 1, with bearing seats 3 on both sides corresponding to the ends of each roller 2; bearing seats 3 having bearing holes inside; and external oil passages on the outside of the bearing seats 3 corresponding to the bearing holes; and a sensing sleeve 4, fitted inside the bearing holes. A strain gauge friction sensor 5 is provided between the bearing seats 3 and the sensing sleeve 4. The inner wall of the sensing sleeve 4 corresponds to the external oil passages. The system includes an internal oil passage; a main bearing 6 housed within the sensing sleeve 4, with each roller 2 engaging with its corresponding main bearing 6 via roller necks 7 at both ends; an oil pump 8 fixedly mounted on the base frame 1, with its output end connected to the external oil passage via a high-pressure pipe and its input end connected to the oil tank 9 via a low-pressure pipe; and a controller fixedly mounted on the base frame 1, with the strain gauge friction sensor 5 and the oil pump 8 electrically connected to the controller. Each sensing sleeve 4 has a first swing arm 10 radially positioned at its end furthest from the roller 2; each bearing seat 3 has a support platform 11 on one side corresponding to the first swing arm 10, with the strain gauge friction sensor 5 fixedly mounted on one side of the support platform 11 and corresponding to the first swing arm 10.

[0015] This technical solution dynamically adjusts lubricant supply by monitoring the friction coefficient in real time, achieving "on-demand lubrication" of the bearings and roller neck 7 of the roller equipment. When the roller 2 rotates, frictional torque is generated between the roller neck 7 and the main bearing 6. This torque is transmitted to the sensing sleeve 4 through the main bearing 6. The sensing sleeve 4 converts the torque into a circumferential force through the first swing arm 10, which acts on the strain gauge friction sensor 5. The sensor converts the mechanical signal into an electrical signal and provides real-time feedback on the change in friction coefficient to the controller. The friction coefficient directly reflects the state of the lubrication film: an increased friction coefficient indicates insufficient surface lubrication; a decreased friction coefficient indicates good lubrication. The controller sets a threshold based on the friction coefficient and dynamically adjusts the start and stop of the oil pump 8. When the friction coefficient exceeds the threshold, the controller starts the oil pump 8, and high-pressure grease passes through the external oil passage, internal oil passage, and the friction pair of the main bearing 6 to form a lubrication film; the oil supply stops when the friction coefficient returns to normal.

[0016] This setup overcomes the hysteresis of traditional indirect parameters by directly measuring the friction coefficient, achieving closed-loop control of "friction state and lubrication amount," reducing lubrication errors by more than 50%. Furthermore, the non-invasive design of the strain gauge friction sensor 5 avoids damage to the bearing housing 3 structure while withstanding heavy industrial vibration environments. The fit between the sensing sleeve 4 and the bearing housing 3 balances torque transmission and sealing, preventing dust intrusion. The controller can be integrated with a PLC or industrial IoT platform, supporting remote monitoring of lubrication data and predicting maintenance cycles. The oil pump 8 offers flexible selection and can be adapted to different viscosities of grease.

[0017] Each of the sensing sleeves 4 is provided with a second swing arm 12 on the side away from the first swing arm 10; each of the bearing seats 3 is provided with a constraint platform 13 on both sides of the second swing arm 12, and each of the constraint platforms 13 is provided with a buffer block 14 on the side of the second swing arm 12.

[0018] This structure, through the coordinated design of the second swing arm 12, the constraint platform 13, and the buffer block 14, primarily addresses the oscillation stability issue of the sensing sleeve 4 during torque transmission. The first swing arm 10 transmits the frictional torque of the main bearing 6 to the strain gauge friction sensor 5, forming the active measurement side. The second swing arm 12 is symmetrically arranged on the other side, forming a physical elastic limit with the buffer block 14 on the constraint platform 13, thus counteracting the reverse oscillation of the sensing sleeve 4 caused by torque and constituting the passive constraint side. This avoids unilateral loading of the sensing sleeve 4, ensuring that the torque measurement accuracy error is <±2%.

[0019] Each of the sensing sleeves 4 is provided with an oil seal 15 at one end corresponding to the roller 2, which cooperates with the roller neck 7, and each of the sensing sleeves 4 is provided with a bearing cover 16 at its outer end; the main bearings 6 are arranged in pairs at intervals; the internal oil passage includes a first oil supply passage 17 corresponding to the two main bearings 6, and a first oil discharge passage 19 corresponding to the outer side of the two main bearings 6; the external oil passage includes a second oil supply passage 18 corresponding to the first oil supply passage 17, and a second oil discharge passage 20 corresponding to the first oil discharge passage 19, the second oil supply passage 18 being connected to the output end of the oil pump 8, and the second oil discharge passage 20 being connected to the oil tank 9.

[0020] This structure, through a multi-channel oil circuit design and grouped layout of the main bearings 6, achieves directional lubrication and waste oil recovery for the roller neck 7 bearings. Its working principle can be divided into three parts: lubrication supply, oil circuit circulation, and sealing protection. The high-pressure oil supply path is as follows: oil pump 8, high-pressure pipe, second oil supply channel 18, first oil supply channel 17, and the gap between the two main bearings 6. Its function is to inject high-pressure grease from the center of the bearing, using centrifugal force to diffuse it to both sides, ensuring a uniform lubricating film covering the rolling elements. The main bearings 6 are arranged in pairs at intervals: by increasing the bearing spacing, short-path leakage of grease is avoided, and the residence time is extended. When the strain gauge friction sensor 5 detects insufficient lubrication, the controller starts the oil pump 8, and high-pressure grease preferentially fills the bearing gap, forming a lubrication core area. The waste oil recovery path is as follows: the outside of the main bearing 6, first oil drain channel 19, second oil drain channel 20, and oil tank 9. Its function is to throw aged grease and wear debris to the outside of the bearing by centrifugal force, and return them to the oil tank 9 for filtration and reuse through the oil drain channel, reducing contamination. This design achieves precise lubrication, waste oil resource utilization, and lightweight maintenance through zoned pressure oil circuits and a closed-loop recovery system.

[0021] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pair of roll dry oil lubricating device with friction coefficient feedback, said pair of roll is composed of a pair of parallel setting rollers (2), characterized in that, include: The base frame (1) has bearing seats (3) on both sides corresponding to the two ends of each roller (2), and each bearing seat (3) has a bearing hole inside, and the bearing seat (3) has an external oil passage corresponding to the bearing hole on the outside; The sensing sleeve (4) is fitted inside the bearing hole, and a strain-type friction sensor (5) is provided between the bearing seat (3) and the sensing sleeve (4). The inner wall of the sensing sleeve (4) is provided with an internal oil passage corresponding to the external oil passage. The main bearing (6) is disposed inside the sensing sleeve (4), and each of the rollers (2) is engaged with the corresponding main bearing (6) through the roller necks (7) at both ends; Oil pump (8), the oil pump (8) is fixedly mounted on the base frame (1), and the output end of the oil pump (8) is connected to the external oil passage through a high pressure pipe, and the input end of the oil pump (8) is connected to the oil tank (9) through a low pressure pipe; The controller is fixedly mounted on the base frame (1), and the strain gauge friction sensor (5) and the oil pump (8) are electrically connected to the controller.

2. A pair of roller dry oil lubricating device with friction coefficient feedback according to claim 1, characterized in that: Each of the sensing sleeves (4) has a first swing arm (10) radially arranged at the end away from the roller (2); each of the bearing seats (3) has a support platform (11) on one side corresponding to the first swing arm (10), and the strain-type friction sensor (5) is fixedly arranged on one side of the support platform (11) and corresponds to the first swing arm (10).

3. A pair of roller dry oil lubricating device with friction coefficient feedback according to claim 2, characterized in that: Each of the sensing sleeves (4) has a second swing arm (12) on the side away from the first swing arm (10); each of the bearing seats (3) has a constraint platform (13) on both sides of the second swing arm (12), and each of the constraint platforms (13) has a buffer block (14) on the side of the second swing arm (12).

4. A pair of roller dry oil lubricating device with friction coefficient feedback according to claim 3, characterized in that: Each of the sensing sleeves (4) is provided with an oil seal (15) that cooperates with the roller neck (7) at one end corresponding to the roller (2), and each of the sensing sleeves (4) is provided with a bearing cover (16) at the outer end; the main bearings (6) are arranged in pairs at intervals; the internal oil passage includes a first oil supply passage (17) corresponding to the two main bearings (6) and a first oil discharge passage (19) corresponding to the outer side of the two main bearings (6); the external oil passage includes a second oil supply passage (18) corresponding to the first oil supply passage (17) and a second oil discharge passage (20) corresponding to the first oil discharge passage (19), the second oil supply passage (18) is connected to the output end of the oil pump (8), and the second oil discharge passage (20) is connected to the oil tank (9).

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