Bearing with load measuring function

Abstract

The invention belongs to the field of bearings, and particularly relates to a bearing with a load measuring function. In order to accurately plan the maintenance work of the bearing and guide the improvement of the bearing, the invention provides the bearing with the load measurement function, and the bearing comprises a retainer and a roller; the retainer is provided with a contact surface used for being in contact with the roller, a force sensor is arranged on the contact surface, and the force sensor is used for measuring the contact load between the roller and the retainer; the retainer comprises a coating sensor, or a bridge type strain gauge is mounted on the retainer, and the coating sensor or the bridge type strain gauge is used for measuring the deformation degree of the retainer; a control module is further fixedly connected to the holder and used for transmitting data measured by all the sensors to an upper computer. The relationship between the deformation degree of the retainer and the contact load between the roller and the retainer is measured through a force sensor and a bridge type strain gauge (coating sensor), so that the maintenance work of the bearing is conveniently planned, and the bearing improvement is conveniently guided.

Description

Technical Field

[0001] The invention belongs to the field of bearings, and in particular relates to a bearing with a load measurement function. Background Art

[0002] During the use of bearings, it is necessary to monitor the state of the bearings and plan the maintenance work of the bearings according to the state of the bearings. At the same time, the monitoring data helps researchers determine the reasons for the abnormal state of the bearings and has important guiding significance for the improvement of the bearings.

[0003] At present, there are two main monitoring methods in the existing technology: Method 1: Use coating sensors or bridge strain gauges to analyze the deformation of the cage.

[0004] For example, a Chinese invention patent with an authorization announcement number of CN109488691B and an authorization announcement date of 2022.02.01 discloses a cage and a bearing unit with an integrated coating sensor, wherein the cage includes a coating sensor, and the coating sensor includes a conductive layer, wherein the conductive layer has a plurality of electrodes, and when the cage is deformed, the resistance between different electrodes will change, and when the deformation degree of the cage is different, the change value of the resistance is different, thereby monitoring the deformation degree of the cage. At the same time, the coating sensor is equipped with a conductive slip ring, which is used to output electrical signals from the cage.

[0005] Method 2: Use force sensors to analyze the deformation of the roller.

[0006] For example, a Chinese invention patent application with application publication number CN108317181A and application publication date 2018.07.24 discloses a double-groove ball automobile bearing with a deformation detection function, in which a first pressure sensor is provided on the contact surface of the bearing cage for contacting the roller, and the contact load between the roller and the cage can be detected by the first pressure sensor. At the same time, a second pressure sensor is embedded in the inner ring of the bearing, and the contact load between the roller and the inner ring of the bearing can be detected by the second pressure sensor. When the ratio of the data measured by the first pressure sensor to the data measured by the second pressure sensor changes, the roller may have deformed.

[0007] In method 1, the coating sensor or bridge strain gauge can only monitor whether the cage is deformed, but cannot monitor the actual contact load between the cage and the roller, and therefore cannot know the load condition that causes the cage to deform, which is not conducive to planning maintenance work on the bearing and guiding bearing improvements.

[0008] In the second method, since the roller and the cage cannot always move synchronously, the contact load between the roller and the cage and the contact load between the roller and the inner ring of the bearing are not constant, which results in the ratio of the data measured by the first pressure sensor to the data measured by the second pressure sensor often changing. Every time the ratio changes, the roller may or may not have deformed. In actual engineering, it is impossible for the staff to always stay by the bearing and disassemble the bearing and detect whether the roller is deformed every time the ratio changes. This results in the staff being unable to know when the bearing has deformed, which is not conducive to planning the maintenance of the bearing and guiding the improvement of the bearing.

[0009] Therefore, there is an urgent need for a bearing that can help staff accurately plan maintenance work and guide R&D personnel in the direction of improvement. Summary of the invention

[0010] The purpose of the present invention is to provide a bearing with a load measurement function to solve the technical problem in the prior art that the maintenance work on the bearing cannot be accurately planned and the improvement of the bearing cannot be accurately guided.

[0011] To achieve the above purpose, the technical solution of the bearing with load measurement function provided by the present invention is: A bearing with a load measurement function comprises a cage and a roller; the cage has a contact surface for contacting the roller, a force sensor is arranged on the contact surface, and the force sensor is used to measure the contact load between the roller and the cage; The cage includes a coating sensor, or a bridge-type strain gauge is installed on the cage, and the coating sensor or the bridge-type strain gauge is used to measure the deformation degree of the cage; The holder is also fixedly connected with a control module, which is used to transmit the data measured by all sensors to the host computer.

[0012] Furthermore, the retaining frame includes two annular rings and beams that are arranged at intervals along the circumferential direction and connected to the two annular rings. The two adjacent beams and the corresponding parts of the annular rings together form pockets, and the rollers are located in the pockets. Each beam has two contact surfaces for contacting different rollers; and force sensors are provided on both contact surfaces of at least one of the beams.

[0013] Furthermore, the roller is a truncated cone roller or a cylindrical roller, and at least two force sensors are arranged at intervals on at least one contact surface along the extension direction of the corresponding lintel.

[0014] Furthermore, only one lintel is provided with a force sensor, and the control module is located on the extension line of the lintel.

[0015] Furthermore, a mounting groove is provided on the contact surface, and the force sensor is installed in the mounting groove.

[0016] Furthermore, a wiring groove is provided on the contact surface where the force sensor is provided, the wiring groove is connected to the installation groove, the force sensor is connected to the control module through a wire, and the side of the wire close to the force sensor is located in the wiring groove.

[0017] Furthermore, at least one strain gauge is provided on the lintel, at least three strain gauges are provided on each annular ring, and at least one strain gauge on the annular ring with a larger radius constitutes an outer strain gauge, at least one strain gauge on the annular ring with a smaller radius constitutes an inner strain gauge, and at least one strain gauge on the lintel constitutes an intermediate strain gauge. The number of inner strain gauges, intermediate strain gauges and outer strain gauges is the same, one inner strain gauge, one intermediate strain gauge and one outer strain gauge correspond to each other and constitute a strain gauge group. In each strain gauge group, the intermediate strain gauge is located at the center of the corresponding lintel, and the extension line of the connection line of the outer strain gauge, the intermediate strain gauge and the inner strain gauge passes through the rotation axis of the bearing.

[0018] Furthermore, only one lintel is provided with a strain gauge, and the control module is located on the extension line of the lintel.

[0019] Furthermore, the control module is fixed on the outer side of the retaining frame.

[0020] Furthermore, the control module includes a wireless communication module for wirelessly communicating with a host computer.

[0021] The beneficial effects of the bearing with load measurement function of the present invention are as follows: the present invention is an improved invention creation. The main difference between the present invention and the prior art is that in the prior art, the cage only includes a coating sensor, or the cage is only provided with a force sensor, while in the present invention, on the basis of the force sensor being provided on the cage, the cage is also provided with a bridge strain gauge or includes a coating sensor.

[0022] In actual use, the force sensor can measure the contact load between the roller and the cage in real time, the bridge strain gauge or coating sensor can measure the deformation degree of the cage, and the control module transmits the measured data to the host computer, so that the staff can monitor the working condition of the bearing. When the resistance of the bridge strain gauge and the coating sensor changes, the cage deforms. At this time, the staff can select the data of the force sensor near this moment to analyze the cause of the cage deformation, which is conducive to planning the maintenance work of the bearing and guiding the improvement work of the bearing.

[0023] Compared with the prior art which is only provided with a coating sensor, the present invention can measure the contact load between the roller and the cage, especially the contact load between the roller and the cage when the cage is deformed; compared with the prior art which is only provided with a force sensor, the present invention can accurately determine the moment when the cage is deformed, thereby obtaining the contact load between the roller and the cage when the cage is deformed, and at the same time, can combine the deformation degree of the cage with the contact load between the roller and the cage at the corresponding moment, so as to facilitate the staff to analyze the data and make further improvements to the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the retainer of the bearing with load measurement function of the present invention; Figure 2 for Figure 1 Structural diagram of the middle lintel; Figure 3 for Figure 1 A structural diagram of the center lintel from one perspective; Figure 4 for Figure 3 A schematic cross-sectional view of the middle mounting groove; Figure 5 for Figure 1 Structural diagram of the center lintel from another perspective; Figure 6 A circuit function diagram of a bearing with a load measurement function according to the present invention; Figure 7 A structural schematic diagram of a position of a control module in a bearing with a load measurement function according to the present invention from one viewing angle; Figure 8 A structural schematic diagram of another perspective of the position of the control module in the bearing with load measurement function of the present invention; Fig. 9 It is a structural schematic diagram of the position of the strain gauge in the bearing with load measurement function of the present invention.

[0025] Description of reference numerals: 1. Roller; 2. Cage; 21. Annular ring; 22. Lintel; 23. Mounting groove; 24. Wiring groove; 25. Pocket; 3. Control module; 4. Force sensor; 5. Outer ring; 6. Inner ring; 7. Bridge strain gauge. DETAILED DESCRIPTION

[0026] In order to solve the problems in the background technology, the core inventive concept of the present invention is: on the basis of a force sensor being provided on the cage, the cage is also provided with a bridge-type strain gauge or includes a coating sensor, so as to measure the contact load between the roller and the cage when the cage is deformed and the relationship between the deformation degree of the cage and the contact load between the roller and the cage.

[0027] The present invention is further described in detail below in conjunction with embodiments.

[0028] Specific embodiments of the bearing with load measurement function provided by the present invention: like Figures 1 to 9 As shown, in a basic specific implementation method, the bearing with load measurement function includes an inner ring 6, an outer ring 5, a cage 2 and a roller 1; the cage 2 has a contact surface for contacting the roller 1, and a force sensor 4 is provided on the contact surface, and the force sensor 4 is used to measure the contact load between the roller 1 and the cage 2; a bridge strain gauge 7 is installed on the cage 2, and the coating sensor or the bridge strain gauge 7 is used to measure the deformation degree of the cage 2; the cage 2 is also fixedly connected to a control module 3, and the control module 3 is used to transmit all the data measured by the sensors to the host computer.

[0029] Among them, the bridge strain gauge 7 is bonded to the retaining frame 2; the force sensor 4 is bonded to the contact surface, or a mounting groove 23 is provided on the contact surface, the force sensor 4 is embedded in the mounting groove 23, and one end of the force sensor 4 leaks out from the mounting groove 23 (the groove depth of the mounting groove 23 is slightly smaller than the height of the force sensor 4) to ensure that the force sensor 4 can contact the roller 1; the control module 3 includes a shell and internal functional elements, the shell is bonded to the retaining frame 2 and rotates synchronously with the retaining frame 2 to ensure that the wires between the control module 3 and the corresponding sensor or strain gauge 7 are not damaged.

[0030] In another basic specific implementation, the retaining frame 2 includes a coating sensor, and the structure of the coating sensor can refer to the Chinese invention patent with authorization announcement number CN109488691B, which will not be described in detail here.

[0031] The main difference between the present invention and the prior art is that in the prior art, the cage 2 only includes a coating sensor, or only a force sensor 4 is provided on the cage 2, while in the present invention, on the basis of the force sensor 4 being provided on the cage 2, the cage 2 is also provided with a bridge strain gauge 7 or includes a coating sensor. Among them, the force sensor 4 can directly and quantitatively measure the contact load between the roller 1 and the cage 2, and the bridge strain gauge 7 and the coating sensor can indirectly and qualitatively obtain the load on the cage 2 through the deformation degree of the cage 2 (different deformation degrees result in different resistance changes), and the two refer to each other.

[0032] In actual use, the force sensor 4 can measure the contact load between the roller 1 and the cage 2 in real time, the bridge strain gauge 7 or the coating sensor can measure the deformation degree of the cage 2, and the control module 3 transmits the measured data to the host computer, so that the staff can monitor the working condition of the bearing. When the resistance of the bridge strain gauge 7 and the coating sensor changes, the cage 2 is deformed. At this time, the staff can select the data of the force sensor 4 near this moment to analyze the cause of the deformation of the cage 2, which is conducive to planning the maintenance work of the bearing and guiding the improvement work of the bearing.

[0033] Compared with the prior art which is only provided with a coating sensor, the present invention can measure the contact load between the roller 1 and the cage 2, especially the contact load between the roller 1 and the cage 2 when the cage 2 is deformed; compared with the prior art which is only provided with a force sensor 4, the present invention can accurately determine the moment when the cage 2 is deformed, thereby obtaining the contact load between the roller 1 and the cage 2 when the cage 2 is deformed, and at the same time, can combine the deformation degree of the cage 2 with the contact load between the roller 1 and the cage 2 at the corresponding moment, so as to facilitate the staff to analyze the data and make further improvements to the bearing.

[0034] As one specific embodiment, the retaining frame 2 includes two annular rings 21 and beams 22 which are arranged at intervals along the circumferential direction and connected to the two annular rings 21. The two adjacent beams 22 and the corresponding parts of the annular rings 21 together form a pocket 25. The roller 1 is located in the pocket 25. Each beam 22 has two contact surfaces for contacting different rollers 1; and at least one of the beams 22 is provided with a force sensor 4 on both contact surfaces.

[0035] When the bearing is working, there are generally two situations. The first is that the roller 1 pushes the retaining frame 2 to move, and the second is that the retaining frame 2 pushes the roller 1 to move. Force sensors 4 are arranged on the two contact surfaces of the same beam 22. In both cases, the contact load between the same beam 22 and the corresponding roller 1 can be measured, so as to better analyze the force condition of the beam 22 (the beam 22 with force sensors 4 on both contact surfaces), which is conducive to guiding the improvement of the bearing.

[0036] In other specific implementations, referring to the Chinese invention patent application with application publication number CN108317181A, the structure of the retainer 2 may also be the same as the retainer 2 structure in the application, which will not be described in detail here.

[0037] In some specific embodiments, the roller 1 is a truncated cone roller or a cylindrical roller, and along the extension direction of the corresponding lintel 22, at least two force sensors 4 are arranged at intervals on at least one contact surface, preferably two or three, but may also be four or more.

[0038] When the number of force sensors 4 increases, the structure becomes more complicated and the marginal effect becomes more serious. Therefore, those skilled in the art may determine the number of force sensors 4 according to actual conditions (mainly depending on the specifications of the retaining frame 2 ).

[0039] Preferably, the roller 1 is a truncated cone roller, and in this case the bearing is a tapered roller bearing, which can be used in larger equipment, especially fans.

[0040] When the roller 1 is a truncated cone roller or a cylindrical roller, the contact area between the roller 1 and the cage 2 at the same time is larger. At this time, the two force sensors 4 on the contact surface can measure the contact load between the roller 1 and the cage 2 more accurately.

[0041] In other specific embodiments, the roller 1 may also be a spherical roller.

[0042] In the present invention, preferably, only one lintel 22 is provided with a force sensor 4, and the control module 3 is located on the extension line of the lintel 22, which is convenient for arranging the wires; similarly, only the lintel 22 is provided with a strain gauge 7, which is convenient for arranging the wires. At this time, the wires can be bonded to the lintel 22 and the annular ring 21, or the wires are in a taut state and do not need to be bonded and fixed.

[0043] In other specific embodiments, the force sensor 4 may be arranged on two, three or more beams 22, and the strain gauge 7 may also be bonded to two, three or more beams 22. In this case, in order to better prevent the wire from contacting the roller 1, the wire may be bonded to the beam 22 and the annular ring 21. The more beams 22 are provided with the force sensor 4 (strain gauge 7), the more the overall force (deformation) of the cage 2 can be analyzed as a whole.

[0044] Preferably, when the force sensor 4 is embedded in the installation groove 23, a wiring groove 24 is also provided on the contact surface provided with the force sensor 4, the wiring groove 24 is communicated with the installation groove 23, the force sensor 4 is connected with the control module 3 through a wire, and the side of the wire close to the force sensor 4 is located in the wiring groove 24, thereby avoiding contact between the wire and the roller 1. Of course, the wiring groove 24 can also be provided on the annular ring 21.

[0045] In order to better measure the deformation degree of the retaining frame 2, preferably, at least one strain gauge 7 is provided on the crossbeam 22, at least three strain gauges 7 are provided on each annular ring 21, and at least one strain gauge 7 on the annular ring 21 with a larger radius constitutes an outer strain gauge, at least one strain gauge 7 on the annular ring 21 with a smaller radius constitutes an inner strain gauge, and at least one strain gauge 7 on the crossbeam 22 constitutes an intermediate strain gauge. The number of inner strain gauges, intermediate strain gauges and outer strain gauges is the same, one inner strain gauge, one intermediate strain gauge and one outer strain gauge correspond to each other and constitute a strain gauge group. In each strain gauge group, the intermediate strain gauge is located at the center of the corresponding crossbeam 22, and the extension line of the connecting line of the outer strain gauge, the intermediate strain gauge and the inner strain gauge passes through the rotation axis of the bearing.

[0046] For example, in Fig. 9 In the specific embodiment shown, three strain gauges 7 are provided on the lintel 22, and the middle strain gauge 7 constitutes the middle strain gauge; three strain gauges 7 are provided on the inner annular ring 21, and the middle strain gauge 7 constitutes the inner strain gauge; three strain gauges 7 are provided on the outer annular ring 21, and the middle strain gauge 7 constitutes the inner strain gauge. This arrangement can measure the forces in both the axial and radial directions at the same time.

[0047] The two strain gauges 7 on the lintel 22 except the middle strain gauge are respectively located at the two ends of the lintel 22, so as to better measure the deformation of the connection between the lintel 22 and the annular ring 21. The middle strain gauge can better measure the deformation at the center of the lintel 22. The inner, middle and outer strain gauges cooperate with each other to better measure the deformation of the connection between the lintel 22 and the annular ring 21.

[0048] In other specific embodiments, only the middle strain gauge may be provided on the lintel 22; four, five or more strain gauges 7 may be provided on the annular ring 21; and the number of strain gauges 7 on the lintel 22 may also be two, four or more.

[0049] The more strain gauges 7 there are, the better the measurement effect is, but the structure is more complicated and the wiring difficulty is higher. Those skilled in the art can determine the number of strain gauges 7 according to actual conditions (mainly depending on the specifications of the cage 2).

[0050] In the present invention, preferably, Figure 7 As shown, the control module 3 is fixed to the outside of the cage 2 (or the large end of the cage 2 ), and there is a large space between the cage 2 and the outer ring 5 , so the cage 2 is easy to arrange.

[0051] In other specific implementations, the control module 3 may also be fixed on the inner side of the retaining frame 2 , as long as there is enough space between the retaining frame 2 and the inner ring 6 .

[0052] In the present invention, preferably, the control module 3 includes a wireless communication module for wireless communication with a host computer, and has a simple structure.

[0053] In other specific implementations, referring to the Chinese invention patent with authorization announcement number CN109488691B, a conductive slip ring stator is provided on the outer ring 5, and the control module 3 further includes a conductive mover, which is always in conductive contact with the conductive slip ring stator.

[0054] In the present invention, if Figure 6 As shown, the control module 3 includes a housing and a microcontroller unit (MCU) installed in the housing, a power supply (corresponding to a battery-powered system), a storage device, a wireless communication device, a signal conditioning circuit and an inertial measurement unit (IMU). The inertial measurement unit is a device for measuring the three-axis attitude angle (or angular velocity) and acceleration of an object.

[0055] It should be noted that before using the retaining frame 2, load calibration is required on the test bench (calibrating the relationship between the resistance change of the strain gauge 7 and the load change on the retaining frame 2) to ensure the accuracy of the data measured by the strain gauge 7; when bonding the strain gauge 7 to the retaining frame 2, the bonding position should be accurately positioned; the control module 3, strain gauge 7, wires, etc. should be sealed to avoid being affected by the bearing lubricant.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions recorded in the aforementioned embodiments without creative work, or to replace some of the technical features therein with equivalents, or to organically combine different specific implementations to combine the attached Figures 1 to 9 The specific implementation methods given in the specification are, of course, those skilled in the art can also combine the specific implementation methods not given in the other drawings of the specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bearing with a load measurement function, comprising a cage and a roller; the cage has a contact surface for contacting the roller, a force sensor is provided on the contact surface, and the force sensor is used to measure the contact load between the roller and the cage; It is characterized in that The cage includes a coating sensor, or a bridge-type strain gauge is installed on the cage, and the coating sensor or the bridge-type strain gauge is used to measure the deformation degree of the cage; The holder is also fixedly connected with a control module, which is used to transmit the data measured by all sensors to the host computer.

2. The bearing with load measurement function according to claim 1, characterized in that: The retaining frame includes two annular rings and beams that are arranged at intervals along the circumferential direction and connected to the two annular rings. The two adjacent beams and the corresponding parts of the annular rings together form pockets, and the rollers are located in the pockets. Each beam has two contact surfaces for contacting different rollers; and force sensors are provided on both contact surfaces of at least one of the beams.

3. The bearing with load measurement function according to claim 2, characterized in that: The roller is a truncated cone roller or a cylindrical roller, and at least two force sensors are arranged at intervals on at least one contact surface along the extension direction of the corresponding lintel.

4. The bearing with load measurement function according to claim 2 or 3, characterized in that: Only one lintel is provided with a force sensor, and the control module is located on the extension line of the lintel.

5. The bearing with load measurement function according to any one of claims 1 to 3, characterized in that: The contact surface is provided with a mounting groove, and the force sensor is mounted in the mounting groove.

6. The bearing with load measurement function according to claim 5, characterized in that: A wiring groove is also provided on the contact surface where the force sensor is provided. The wiring groove is communicated with the installation groove. The force sensor is connected to the control module through a wire, and the side of the wire close to the force sensor is located in the wiring groove.

7. The bearing with load measurement function according to claim 2 or 3, characterized in that: At least one strain gauge is arranged on the lintel, at least three strain gauges are arranged on each annular ring, at least one strain gauge on the annular ring with a larger radius constitutes an outer strain gauge, at least one strain gauge on the annular ring with a smaller radius constitutes an inner strain gauge, at least one strain gauge on the lintel constitutes an intermediate strain gauge, the number of inner strain gauges, intermediate strain gauges and outer strain gauges is the same, one inner strain gauge, one intermediate strain gauge and one outer strain gauge correspond to each other and constitute a strain gauge group, in each strain gauge group, the intermediate strain gauge is located at the center of the corresponding lintel, and the extension line of the connection line of the outer strain gauge, the intermediate strain gauge and the inner strain gauge passes through the rotation axis of the bearing.

8. The bearing with load measurement function according to claim 7, characterized in that: Only one lintel is provided with a strain gauge, and the control module is located on the extension line of the lintel.

9. The bearing with load measurement function according to any one of claims 1 to 3, characterized in that: The control module is fixed on the outside of the cage.

10. The bearing with load measurement function according to any one of claims 1 to 3, characterized in that: The control module includes a wireless communication module for wireless communication with a host computer.

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