Bearing roller load measurement sensor device and intelligent roller

Abstract

The invention relates to the technical field of bearings, in particular to a bearing roller load measurement sensor device and an intelligent roller. The bearing roller load measurement sensor device is used for being installed in an inner hole of a bearing roller and comprises a sensor module, the sensor module comprises a strain gauge and a force bearing base body, and the force bearing base body is provided with a force bearing part used for abutting against the hole wall of the inner hole of the bearing roller. The strain gauges are arranged on the bearing base body and are spaced from the hole wall of an inner hole of the bearing roller during use, the bearing base body elastically deforms when the bearing roller deforms due to load, the strain gauges are used for sensing the deformation of the bearing base body, and the device comprises a signal processing module for processing signals of the strain gauges to obtain the load borne by the bearing roller. The bearing base body is in elastic contact with the bearing roller body to transmit deformation, it is guaranteed that the strain gauges reliably sense the deformation, measurement failure caused by deformation of the inner hole of the roller is not prone to occurring, and reliable use is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a bearing roller load measurement sensor device and an intelligent roller. Background Art

[0002] In recent years, intelligent wireless technology has been integrated into bearing products, which can monitor the operating status of bearings in real time. By enabling the built-in sensors in the bearing rollers to detect damage caused by creep effects at an early stage, remedial measures can be taken in time.

[0003] A Chinese invention patent application with application publication number CN116989927A discloses an annular strain sensor, roller and roller bearing for load measurement. The roller is an intelligent roller, and the roller structure is a hollow cylindrical roller or a hollow tapered roller. The roller is provided with a through hole along the axis, which is the inner hole of the roller. The inner hole of the roller is integrated with a sensor module, a wireless transmission module, a power supply module, an embedded controller and a three-layer circuit board carrying each module, which is used to collect and send strain values ​​on the inner hole wall of the roller. The sensor module includes a plurality of flexible annular strain sensors for measuring strain values ​​on the inner hole wall. The flexible annular strain sensors are composed of a plurality of foil strain gauges distributed at specific angles and connected in a specific bridge group manner, and an annular flexible circuit board for carrying and connecting the foil strain gauges. To fix the electronic components of the smart roller, the battery is placed in a semi-cylindrical battery case made of plastic material. Several flexible annular strain sensors in the smart roller are pasted at equal intervals and the battery case with installed components is placed at a designated position in the hollow roller of the smart roller. Then, epoxy resin glue is filled into the inner hole of the smart roller to fix the electronic components in the smart roller and protect the electronic components from being damaged or invaded by foreign objects.

[0004] The strain gauge of the sensor of this intelligent roller is attached to the wall of the roller's inner hole to sense the strain of the roller when it is loaded, measure the deformation of the roller, and then calculate the load on the roller using the functional relationship between strain and load. Among them, the strain gauge of the sensor is fixed by curing epoxy resin glue. Due to the "chewing" effect inside the hollow roller, the sensor in the inner hole of the hollow roller may fall off due to the failure of the glue after working for a long time. The strain gauge has poor contact with the wall of the roller's inner hole, which can easily lead to sensor failure. Summary of the invention

[0005] The object of the present invention is to provide a bearing roller load measurement sensor device to solve the problem that the current bearing roller load measurement sensor device is easily affected by the deformation of the roller inner hole and the strain gauge is easily affected by the deformation of the roller inner hole. The contact between the strain gauge and the hole wall of the roller inner hole leads to unreliable measurement; the object of the present invention is also to provide an intelligent roller to solve the above-mentioned problem.

[0006] The technical solution of the bearing roller load measurement sensor device of the present invention is:

[0007] A bearing roller load measurement sensor device is used to be installed in the inner hole of the bearing roller. The device includes a sensor module, the sensor module includes a strain gauge and a load-bearing base, the load-bearing base has a load-bearing portion for abutting against the hole wall of the inner hole of the bearing roller, the strain gauge is arranged on the load-bearing base and is spaced from the hole wall of the inner hole of the bearing roller when in use, the load-bearing base undergoes elastic deformation when the bearing roller is deformed by load, the strain gauge is used to sense the deformation of the load-bearing base, and the device includes a signal processing module for processing the signal of the strain gauge to obtain the load on the bearing roller.

[0008] Beneficial effect: The present invention makes element changes on the basis of the bearing roller load measurement sensor device in the prior art, and sets the strain gauge of the sensor module on a load-bearing substrate that can be elastically deformed. The load-bearing substrate contacts the hole wall of the inner hole of the bearing roller, while the strain gauge does not contact the hole wall of the inner hole of the bearing roller. When the bearing roller is deformed due to load, the load-bearing part of the load-bearing substrate inside it is subjected to the force of the bearing roller, and the load-bearing substrate undergoes elastic deformation. The strain gauge senses the deformation of the load-bearing substrate and transmits the signal to the signal processing module. The deformation of the load-bearing substrate is positively correlated with the deformation of the bearing roller. The strain gauge has a corresponding relationship with the load on the bearing roller. The signal of the strain gauge can be processed by the signal processing module to obtain the corresponding load on the bearing roller, thereby realizing the measurement of the bearing roller load. This sensor structure utilizes the elastic contact of the load-bearing substrate with the bearing roller body to transmit deformation, which is conducive to ensuring that the strain gauge reliably senses the deformation and is not easily affected by the deformation of the inner hole of the roller to cause measurement failure, which is conducive to reliable use.

[0009] Furthermore, the load-bearing base is a conical structure with a large diameter end and a small diameter end, the diameter of the large diameter end is larger than the diameter of the small diameter end, the load-bearing part is at the large diameter end, and the strain gauge is arranged on the conical surface of the load-bearing base.

[0010] Furthermore, there are more than two sensor modules, two adjacent sensor modules form a group, the load-bearing bases of the two sensor modules in the same group are symmetrically arranged with the large-diameter ends facing each other, and the device includes a component for clamping and fixing the sensor modules so that the large-diameter ends of the load-bearing bases of the two sensor modules in the same group are squeezed and deformed against each other and pressed against the hole wall of the inner hole of the bearing roller.

[0011] Furthermore, a positioning shaft is provided on one of the small-diameter end of the load-bearing base and the component for clamping and fixing the sensor module, and a positioning groove for the positioning shaft to extend into is provided on the other.

[0012] Furthermore, the load-bearing base has an annular wall, and strain gauges are provided on the inner circumferential surface and the outer circumferential surface of the annular wall.

[0013] Furthermore, a plurality of strain gauges are provided and are evenly distributed along the circumferential direction.

[0014] Furthermore, the device includes a battery module, and the sensor module is arranged on one axial side of the battery module. The battery module and the sensor module are respectively provided with wiring channels inside.

[0015] Further, the device comprises an end cap for being threadedly connected at an opening of the inner hole of the bearing roller.

[0016] Furthermore, the end cap has an inner cavity, and the signal processing module is arranged in the inner cavity of the end cap.

[0017] The technical solution of the smart roller of the present invention is:

[0018] A smart roller comprises a bearing roller having an inner hole and a bearing roller load measuring sensor device, wherein the bearing roller load measuring sensor device is used to be installed in the inner hole of the bearing roller, the bearing roller load measuring sensor device comprises a sensor module, the sensor module comprises a strain gauge and a load-bearing base, the load-bearing base has a load-bearing portion for abutting against the hole wall of the inner hole of the bearing roller, the strain gauge is arranged on the load-bearing base and is spaced from the hole wall of the inner hole of the bearing roller when in use, the load-bearing base undergoes elastic deformation when the bearing roller is deformed by load, the strain gauge is used to sense the deformation of the load-bearing base, and the device comprises a signal processing module for processing the signal of the strain gauge to obtain the load on the bearing roller.

[0019] Beneficial effect: The present invention makes element changes on the basis of the bearing roller load measurement sensor device of the intelligent roller in the prior art, and sets the strain gauge of the sensor module on a load-bearing substrate that can be elastically deformed. The load-bearing substrate contacts the hole wall of the inner hole of the bearing roller, while the strain gauge does not contact the hole wall of the inner hole of the bearing roller. When the bearing roller is deformed due to load, the load-bearing part of the load-bearing substrate inside it is subjected to the force of the bearing roller, and the load-bearing substrate undergoes elastic deformation. The strain gauge senses the deformation of the load-bearing substrate and transmits the signal to the signal processing module. The deformation of the load-bearing substrate is positively correlated with the deformation of the bearing roller. The strain gauge has a corresponding relationship with the load on the bearing roller. The signal of the strain gauge can be processed by the signal processing module to obtain the corresponding load on the bearing roller, thereby realizing the measurement of the bearing roller load. This sensor structure utilizes the elastic contact of the load-bearing substrate with the bearing roller body to transmit deformation, which is conducive to ensuring that the strain gauge reliably senses the deformation and is not easily affected by the deformation of the inner hole of the roller to cause measurement failure, which is conducive to reliable use.

[0020] Furthermore, the load-bearing base is a conical structure with a large diameter end and a small diameter end, the diameter of the large diameter end is larger than the diameter of the small diameter end, the load-bearing part is at the large diameter end, and the strain gauge is arranged on the conical surface of the load-bearing base.

[0021] Furthermore, there are more than two sensor modules, two adjacent sensor modules form a group, the load-bearing bases of the two sensor modules in the same group are symmetrically arranged with the large-diameter ends facing each other, and the device includes a component for clamping and fixing the sensor modules so that the large-diameter ends of the load-bearing bases of the two sensor modules in the same group are squeezed and deformed against each other and pressed against the hole wall of the inner hole of the bearing roller.

[0022] Furthermore, a positioning shaft is provided on one of the small-diameter end of the load-bearing base and the component for clamping and fixing the sensor module, and a positioning groove for the positioning shaft to extend into is provided on the other.

[0023] Furthermore, the load-bearing base has an annular wall, and strain gauges are provided on the inner circumferential surface and the outer circumferential surface of the annular wall.

[0024] Furthermore, a plurality of strain gauges are provided and are evenly distributed along the circumferential direction.

[0025] Furthermore, the device includes a battery module, and the sensor module is arranged on one axial side of the battery module. The battery module and the sensor module are respectively provided with wiring channels inside.

[0026] Further, the device comprises an end cap for being threadedly connected at an opening of the inner hole of the bearing roller.

[0027] Furthermore, the end cap has an inner cavity, and the signal processing module is arranged in the inner cavity of the end cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of embodiment 1 of the smart roller of the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the matching relationship between the modules of the bearing roller load measurement sensor device;

[0030] Figure 3 for Figure 2 A schematic diagram of the sensor module in FIG.

[0031] Figure 4 It is a schematic diagram of the composition of the measurement circuit of the smart roller of the present invention;

[0032] Figure 5 A schematic diagram of a bridge assembly scheme of the smart roller of the present invention;

[0033] Figure 6 for Figure 5 Schematic diagram of the relative positions of strain gauges in the bridge assembly scheme;

[0034] Figure 7 A schematic diagram of another bridge assembly solution of the smart roller of the present invention;

[0035] Figure 8for Figure 7 Schematic diagram of the relative positions of strain gauges in the bridge assembly scheme;

[0036] Fig. 9 It is a schematic structural diagram of embodiment 2 of the smart roller of the present invention.

[0037] In the figure: 1. hollow roller; 2. sensor module; 21. strain gauge; 22. load-bearing base; 23. wiring hole; 24. positioning groove; 25. center axis; 3. battery module; 31. battery shell; 32. battery; 4. signal processing module; 5. end cap; 6. rubber sleeve. DETAILED DESCRIPTION

[0038] The basic concept of the smart roller of the present invention is to set the strain gauge of the sensor on a load-bearing substrate that can elastically deform, and use the load-bearing substrate to transmit deformation, which is conducive to ensuring that the strain gauge can reliably sense the deformation and is not easily affected by the deformation of the inner hole of the roller and affect the measurement.

[0039] The present invention is specifically described below with reference to the embodiments.

[0040] Embodiment 1 of the smart roller of the present invention:

[0041] like Figure 1 , Figure 2 , Figure 3 As shown, the smart roller includes a bearing roller with an inner hole and a bearing roller load measuring sensor device arranged in the inner hole of the bearing roller. The bearing roller with an inner hole is a hollow roller 1. The inner hole of the hollow roller 1 is a cylindrical hole and penetrates the hollow roller 1 axially. The bearing roller load measuring sensor device is installed in the inner hole of the hollow roller 1. The inner hole of the hollow roller 1 is the inner hole of the bearing roller. The bearing roller load measurement sensor device includes a sensor module 2, which includes a strain gauge 21 and a load-bearing base 22. The load-bearing base 22 has a load-bearing portion for abutting against the hole wall of the inner hole of the hollow roller 1. The strain gauge 21 is arranged on the load-bearing base 22 and is spaced from the hole wall of the inner hole of the hollow roller 1 when in use. The load-bearing base 22 elastically deforms when the hollow roller 1 is deformed by load. The strain gauge 21 is used to sense the deformation of the load-bearing base 22. The bearing roller load measurement sensor device includes a signal processing module 4 for processing the signal of the strain gauge 21 to obtain the load on the bearing roller.

[0042] The strain gauge 21 of the sensor module 2 is arranged on a load-bearing substrate 22 that can be elastically deformed. The load-bearing part of the load-bearing substrate 22 abuts against the hole wall of the inner hole of the hollow roller 1, while the strain gauge 21 does not contact the hole wall of the inner hole of the hollow roller 1. When the bearing roller is deformed due to load, the load-bearing part of the load-bearing substrate 22 in its inner hole is subjected to the force of the bearing roller, and the load-bearing substrate 22 is elastically deformed. The strain gauge 21 senses the deformation of the load-bearing substrate 22 and transmits the signal to the signal processing module 4. The deformation of the load-bearing substrate 22 is positively correlated with the deformation of the hollow roller 1 when it is loaded. The strain gauge 21 has a corresponding relationship with the load on the bearing roller. The signal of the strain gauge 21 can be processed by the signal processing module 4 to obtain the corresponding load on the bearing roller, thereby realizing the measurement of the bearing roller load. This sensor structure uses the load-bearing substrate 22 to elastically contact the bearing roller body to transmit deformation, which is conducive to ensuring that the strain gauge 21 can reliably sense the deformation and is not easily affected by the deformation of the roller inner hole to cause measurement failure, which is conducive to reliable use.

[0043] The hollow roller 1 in this embodiment is a tapered roller, with an axial diameter of 99 mm at one end and 104 mm at the other end, and an axial length of 232 mm. The diameter of the inner hole of the hollow roller 1 is 30 mm, and the bearing roller load measurement sensor device is fixed in the inner hole of the hollow roller 1, and the load-bearing part of the load-bearing base 22 is tightly pressed against the hole wall of the inner hole of the hollow roller 1. In other embodiments, the hollow roller can also be a cylindrical roller.

[0044] The load-bearing base 22 is a conical structure with a large diameter end and a small diameter end. The diameter of the large diameter end is larger than that of the small diameter end. The large diameter end of the load-bearing base 22 is used to form a load-bearing portion that abuts against the hole wall of the inner hole of the hollow roller 1. The strain gauge 21 is arranged on the conical surface of the load-bearing base 22, which is convenient for the arrangement of the strain gauge 21 and for the deformation of the load-bearing base 22 when subjected to force. The large diameter end of the load-bearing base 22 is advantageous for abutting against the hole wall of the inner hole of the hollow roller 1. In other embodiments, the load-bearing base may also be a cylindrical structure, the outer peripheral surface of the load-bearing base is in close contact with the hole wall of the inner hole of the hollow roller and forms a load-bearing portion, and a mounting groove is provided on the load-bearing base, and the strain gauge is arranged in the mounting groove to sense the deformation of the load-bearing base.

[0045] There are more than two sensor modules 2. In this embodiment, there are six sensor modules 2. Two adjacent sensor modules 2 form a group. Every two sensor modules 2 form a group, and there are three groups in total. The three groups of sensor modules 2 are distributed along the axial direction of the hollow roller 1 at intervals. Two groups are arranged at the axial ends of the inner hole of the hollow roller 1, and one group is arranged in the axial middle of the inner hole of the hollow roller 1, so as to measure the force conditions at different positions. In other embodiments, only one group of sensor modules can also be provided.

[0046] The load-bearing bases 22 of the same group of two sensor modules 2 are symmetrically arranged along the axial direction of the hollow roller 1 and the large diameter ends are arranged opposite to each other. The bearing roller load measurement sensor device includes a component for clamping and fixing the sensor module 2 so that the large diameter ends of the load-bearing bases 22 of the same group of two sensor modules 2 are mutually squeezed and deformed and pressed against the hole wall of the inner hole of the hollow roller 1. When the sensor module 2 is clamped and fixed, the large diameter ends of the load-bearing bases 22 of the same group of two sensor modules 2 are mutually squeezed and deformed outward, which is conducive to ensuring reliable contact with the hole wall of the inner hole of the hollow roller 1. In other embodiments, the same group of two axially symmetrical sensor modules may not be arranged, and the large diameter ends of each sensor module are oriented in the same direction, and the load-bearing base and the inner hole of the hollow roller are pressed together by interference fit to achieve tight contact.

[0047] The bearing roller load measurement sensor device includes a battery module 3, which includes a battery shell 31 and a battery 32 installed in the battery shell 31. Two battery modules 3 are provided, each battery module 3 is arranged between two corresponding groups of sensor modules 2, and the sensor module 2 is arranged on one axial side of the battery module 3. The sensor modules 2 are arranged on both axial sides of the battery module 3, and the battery module 3 and the sensor module 2 are respectively provided with wiring channels. The battery module 3 and the sensor module 2 are arranged axially to ensure the radial dimensions of the battery module 3 and the sensor module 2, and to facilitate the setting of the elastic load-bearing base 22. In other embodiments, if space permits, the load-bearing base can also be sleeved on the battery module.

[0048] The bearing roller load measurement sensor device includes an end cap 5 for threaded connection at the orifice of the inner hole of the hollow roller 1. There are two end caps 5, which are respectively arranged at the axial ends of the device. By tightening the end caps 5 at both ends, the two groups of sensor modules 2 at the two ends of the inner hole of the hollow roller 1 can be respectively pressed, and then the sensor modules 2 are clamped in cooperation with the battery module 3. The battery shell 31 of the battery module 3 and the end cap 5 constitute a component for clamping and fixing the sensor module 2. By screwing the end cap 5, a pre-tightening force can be generated on the sensor module 2, so that the load-bearing base 22 is tightly fitted with the inner wall of the hollow roller 1, which is conducive to ensuring reliable abutment and easy disassembly. In other embodiments, end caps may not be provided, and each component can be fixed by pouring glue into the inner hole of the hollow roller.

[0049] A positioning groove 24 is provided on the end face of the small diameter end of the load-bearing base 22, and a positioning shaft is provided on the component for clamping and fixing the sensor module 2, that is, a positioning shaft is provided on the end face of the battery shell 31, and a positioning shaft is provided on the inner end face of the end cap 5, and the positioning shaft extends into the corresponding positioning groove 24, and the positioning shaft of the end cap 5 is adapted to extend into the positioning groove 24 of the adjacent load-bearing base 22, and the positioning shaft of the battery shell 31 is adapted to extend into the positioning groove 24 of the adjacent load-bearing base 22, so as to ensure the relative position of each sensor module 2 when clamping and fixing it. In other embodiments, the positioning groove and the positioning shaft may not be provided, and the end face of the load-bearing base may directly contact the corresponding end faces of the battery shell and the end cap.

[0050] A rubber sleeve 6 is further sleeved on the battery shell 31 , and the outer peripheral surface of the rubber sleeve 6 abuts against the inner wall of the hollow roller 1 , which can play a positioning and buffering role. Figure 2 The rubber sleeve 6 and the battery shell 31 are half-section structures.

[0051] The outer end surface of the end cap 5 does not protrude from the end surface of the hollow roller 1, and a sealing ring is provided between the end cap 5 and the inner wall of the hollow roller 1 to ensure sealing. The end cap 5 is provided with an external thread, and the opening of the inner hole of the hollow roller 1 is provided with an adapted internal thread. The end cap 5 has an inner cavity, and the signal processing module 4 is arranged in the inner cavity of the end cap 5, which has a compact structure and saves space. In other embodiments, the signal processing module can also be installed separately between the sensor module and the end cap.

[0052] The load-bearing base 22 is a conical cylinder structure, having a cylinder bottom and a cylinder mouth, the cylinder mouth is located at the large diameter end of the load-bearing base 22, and the cylinder bottom is located at the small diameter end of the load-bearing base 22, and the outer side surface of the cylinder bottom constitutes the end surface of the small diameter end. The cylinder bottom is provided with an axially penetrating central through hole, which is connected to the positioning groove 24, and the inner diameter of the positioning groove 24 is larger than the inner diameter of the central through hole. The positioning groove 24 is coaxially arranged with the central through hole, and the axis of the central through hole is the axis of the load-bearing base 22. A plurality of wiring holes 23 are also provided on the cylinder bottom at the periphery of the positioning groove 24, and the wiring holes 23 are connected inside and outside, and the wiring holes 23 and the central through hole constitute a wiring channel inside the sensor module 2. The battery module 3 has an axially penetrating center hole, which constitutes a wiring channel inside the battery module 3. The end cap 5 is provided with a connecting hole that penetrates its inner cavity to form its wiring channel. The wiring channel passes through the corresponding positioning axis. The wiring channel of the sensor module 2 corresponds to the wiring channel of the battery module 3 and the wiring channel of the end cap 5 so that the strain gauge 21 is connected to the signal processing module 4 through a wire.

[0053] The cylindrical wall of the load-bearing base 22 constitutes an annular wall, and the inner and outer circumferential surfaces of the annular wall are provided with strain gauges 21, so as to calculate the load on the hollow roller 1 through the signal fitting of the strain gauges 21 on both sides of the inner and outer sides, which is conducive to accurate measurement. In other embodiments, strain gauges may not be provided on the inner circumferential surface of the load-bearing base as needed. In other embodiments, the inner and outer surfaces of the load-bearing base may also be spherical structures.

[0054] The strain gauge 21 is pasted on the load-bearing substrate 22. A plurality of strain gauges 21 are provided and are evenly distributed along the circumferential direction, so as to facilitate the measurement of stress conditions in different directions and to ensure the pasting position of the strain gauge 21. The number of strain gauges 21 is set as required. In other implementations, the distribution of the strain gauges may not be uniform, and the angles between the strain gauges may be different.

[0055] The bearing roller load measurement sensor device is used to measure the roller load of roller bearings. It can measure the deformation of the roller inner hole and realize the accurate measurement of the roller inner hole wall load. The bearing roller load measurement sensor device is fixed in a detachable manner to ensure that the sensor maintains a stable signal during operation and is easy to disassemble and assemble quickly. Ensure that the sensor can still output accurate voltage signals under high load and high-speed rotation. The strain gauge can be pasted on the outside of the roller to ensure a more accurate pasting angle and improve the convenience of operation.

[0056] The sensor module of the bearing roller load measurement sensor device is used to contact the inner wall of the roller to detect deformation, and to collect and transmit load strain data. The signal processing module is used to collect and analyze data. The bearing roller load measurement sensor device also includes a wireless transmission module for transmitting analyzed data to external devices. The battery module is used to power each power module. The end caps on both sides of the axial direction are used to close the inner hole of the roller. The end caps are provided with sealing rings to prevent dust or liquid from entering, and provide pre-tightening force to fix the device, ensuring that the sensor module can closely contact the inner wall of the roller, which is conducive to the accurate measurement of roller deformation by the strain gauge. The three groups of sensor modules not only play a supporting role, but also effectively balance the forces on both sides of the roller axial direction. The bearing roller load measurement sensor device inside the hollow roller is hollow in design as a whole, which is convenient for the subsequent connection of micro wires.

[0057] The battery uses a lithium-ion battery, which is suitable for high-performance application requirements due to its high energy density and long life. The material of the load-bearing matrix can be thermoplastic materials, such as nylon, polypropylene, polycarbonate, etc., which have a certain elastic deformation ability. The end cap can be made of thermosetting materials or thermoplastic materials.

[0058] The signal processing module includes a power management module, signal amplification and processing circuit, microcontroller, filter and other functional units to ensure the stability and accuracy of the signal. The wireless transmission module uses wireless transmission technology to ensure the stability and efficiency of signal transmission through antennas, RF front-end modules and microcontrollers. The measurement circuit composition design is as follows: Figure 4 As shown, it is composed of a single-chip control module, a battery, a voltage stabilizing module, a signal processing module, a sensor module and a wireless transmission module. The wireless transmission module is used to communicate with an external intelligent roller software platform and transmit information so as to obtain the load condition of the roller through the intelligent roller software platform.

[0059] The taper of the load-bearing base is about 15°, and it can be tightened through the threaded connection of the end caps on both sides, so that the two symmetrical load-bearing bases are stretched open and close to the inner wall of the roller. There are wiring holes on the load-bearing base to provide sufficient space for the signal transmission line. The strain gauge is a resistance strain gauge, which allows the strain gauge to be pasted externally, which is more convenient and can improve the accuracy of the pasting angle. Each strain gauge is pasted at an interval of 45°. This layout is not only convenient for the accuracy correction of subsequent measurements, but also conducive to the operation of strain gauge bridge assembly. Different pasting angles will produce certain differences in the measurement output, and the design of this structure can minimize the impact of the angle on the measurement results, thereby improving the accuracy of the output data. Therefore, this design makes the measurement more stable and accurate, ensuring the efficient performance of the strain gauge in practical applications.

[0060] This embodiment adopts a 45° pasting bridge assembly scheme, but it is not limited to any angle pasting, and 90°, 45° and 30° bridge assembly schemes and pasting schemes are all possible.

[0061] In order to understand the solution more clearly, the load calculation process is explained below:

[0062] Any function f(x) with a period of 2T that satisfies the convergence theorem has the following Fourier series expansion:

[0063]

[0064] Where a0 / 2 is the DC component of f(x); a n and b n are the cosine component coefficients and the sine component coefficients respectively.

[0065] When f(x) is an even function:

[0066]

[0067] The radial strain function ε(θ) is an even function with a period of π, so the Fourier series expansion of the radial strain function ε(θ) is

[0068]

[0069] In the formula, the coefficient a n The calculation formula is

[0070]

[0071] ① A bridge assembly solution

[0072] Take 45° as an example of a bridge solution, take two sets of strain gauges of a sensor module as follows Figure 5The bridge is assembled in the manner shown in the figure. R1 to R8 are pasted on the outer peripheral surface of the load-bearing base, and R'1 to R'8 are pasted on the inner peripheral surface. The relative positions are as follows: Figure 6 As shown, the two sets of bridges are connected at a phase interval of 45°. Since the strain values ​​of the outer and inner surfaces of the load-bearing base of the sensor module are opposite, the final result needs to be squared. The output of this bridge scheme under load is:

[0073] (1) At a certain moment, if the angle of the resistance strain gauge R1 in the circumferential direction of the load sensor is θ, and the load sensor is a sensor module, according to Figure 5 The bridge assembly method is that each resistance strain gauge is spaced 45° apart, such as Figure 6 , and its bridge output is

[0074]

[0075] Where U O is the output voltage of the bridge; U i is the input voltage of the bridge; K is the sensitivity coefficient of the resistance strain gauge; ε1~ε8 are the resistance strain gauges; θ is the angle of the resistance strain gauge R1 at a certain moment.

[0076] This paper takes the harmonic component of the radial strain function ε(θ) for analysis. When n is 0~∞:

[0077]

[0078] (2) The second set of bridges is rotated 45° from the first set of bridges, so the pasting angle of each resistance strain gauge is Its output is

[0079]

[0080] In the formula, ε'1~ε'8 are resistance strain gauges, is the angle of the resistance strain gauge R'1 at a certain moment.

[0081] It is also found that the even harmonics are eliminated and the odd harmonics are retained. The second group also takes the harmonic components of the radial strain function ε'(θ) for analysis. When n is 0~∞:

[0082]

[0083] In summary, at a certain moment, the total output of the two groups of bridges is:

[0084]

[0085] ② Another bridge assembly solution

[0086] (1) At a certain moment, if the angle of the resistance strain gauge R1 in the circumferential direction of the load sensor is θ, according to Figure 7The bridge assembly method is that each resistance strain gauge of the same bridge is 90° apart, and the two bridges are 45° apart. Figure 8 , and its bridge output is

[0087]

[0088] Where U O is the output voltage of the bridge; U i is the input voltage of the bridge; K is the sensitivity coefficient of the resistance strain gauge; ε1~ε4 are the resistance strain gauges; θ is the angle of the resistance strain gauge R1 at a certain moment.

[0089] This paper takes the harmonic component of the radial strain function ε(θ) for analysis. It is found that the odd harmonics are eliminated, but the even harmonics are retained. When n is 0~∞:

[0090]

[0091] (2) The second set of bridges is rotated 45° apart from the first set of bridges, so the pasting angle of each resistance strain gauge 21 is Its output is

[0092]

[0093] In the formula, ε'1~ε'4 are resistance strain gauges, is the angle of the resistance strain gauge R'1 at a certain moment.

[0094] Similarly, the second group also takes the first 6 harmonic components of the radial strain function ε'(θ) for analysis. When n is 0~∞:

[0095]

[0096] At a certain moment, the total output of the two bridge groups is:

[0097]

[0098] The Fourier function amplitudes of the theoretical outputs of the above two bridge circuits are both cos(2θ) and sin(2θ), so the total output square sum eliminates all trigonometric function remainders. The bridge circuit can output a stable voltage value when the load on the roller is constant. Then, the entire roller can be used as a sensor to obtain the calibration coefficient through a load calibration experiment. Using the determined calibration coefficient, the corresponding load can be obtained after measuring the strain, and the load can be continuously measured in the actual operation of the roller.

[0099] Embodiment 2 of the smart roller of the present invention:

[0100] The only difference between the smart roller in this embodiment and the smart roller in the above-mentioned embodiment 1 is that the sensor modules of the bearing roller load measurement sensor device of the above-mentioned smart roller are arranged in pairs, and are symmetrical between the two, while in this embodiment, Fig. 9 As shown, each sensor module is a single-row structure, and three single-row sensor modules are used. There is only one sensor module between the two battery modules, and the sensor module includes a load-bearing base 22 of a conical structure and a central axis 25. The load-bearing base 22 is a ring body and is arranged around the central axis 25. The two ends of the central axis 25 are positioned and matched with the battery shell and the end cap of the corresponding battery module. The load-bearing base 22 has an outer conical surface and an inner conical surface to provide a wiring hole 23 that passes through the inside and outside of the load-bearing base 22. The central axis 25 is a hollow axis and is connected to the wiring hole 23. The large diameter end of the conical ring body of the load-bearing base 22 is in contact with the inner wall of the hollow roller. The pasting method of the strain gauge 21 is the same as that of the above-mentioned embodiment 1. This sensor module structural design can effectively simplify the installation process and improve the operational convenience of the overall device.

[0101] Embodiments of the bearing roller load measurement sensor device of the present invention:

[0102] The bearing roller load measuring sensor device of this embodiment is the same as the bearing roller load measuring sensor device in the above-mentioned embodiment 1 or 2, and will not be described again here.

[0103] 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 is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bearing roller load measurement sensor device, used to be installed in the inner hole of a bearing roller, the device includes a sensor module, characterized in that: The sensor module includes a strain gauge and a load-bearing base. The load-bearing base has a load-bearing portion for abutting against the hole wall of the inner hole of the bearing roller. The strain gauge is arranged on the load-bearing base and is spaced from the hole wall of the inner hole of the bearing roller when in use. The load-bearing base undergoes elastic deformation when the bearing roller is deformed by load. The strain gauge is used to sense the deformation of the load-bearing base. The device includes a signal processing module that processes the signal of the strain gauge to obtain the load on the bearing roller.

2. The bearing roller load measuring sensor device according to claim 1, characterized in that: The load-bearing base is a conical structure with a large diameter end and a small diameter end. The diameter of the large diameter end is larger than that of the small diameter end. The load-bearing part is located at the large diameter end, and the strain gauge is arranged on the conical surface of the load-bearing base.

3. The bearing roller load measuring sensor device according to claim 2, characterized in that: There are more than two sensor modules, and two adjacent sensor modules form a group. The load-bearing bases of the two sensor modules in the same group are symmetrically arranged with their large-diameter ends facing each other. The device includes a component for clamping and fixing the sensor modules so that the large-diameter ends of the load-bearing bases of the two sensor modules in the same group are squeezed and deformed against each other and pressed against the hole wall of the inner hole of the bearing roller.

4. The bearing roller load measuring sensor device according to claim 3, characterized in that: One of the small-diameter end of the load-bearing base and the component for clamping and fixing the sensor module is provided with a positioning shaft, and the other is provided with a positioning groove for the positioning shaft to extend into.

5. The bearing roller load measurement sensor device according to any one of claims 1 to 4, characterized in that: The load-bearing base has an annular wall, and strain gauges are arranged on the inner circumference and the outer circumference of the annular wall.

6. The bearing roller load measurement sensor device according to any one of claims 1 to 4, characterized in that: A plurality of strain gauges are provided and are evenly distributed along the circumferential direction.

7. The bearing roller load measurement sensor device according to any one of claims 1 to 4, characterized in that: The device comprises a battery module. The sensor module is arranged on one axial side of the battery module. The battery module and the sensor module are respectively provided with wiring channels inside.

8. The bearing roller load measurement sensor device according to any one of claims 1 to 4, characterized in that: The device includes an end cap for threaded connection at an aperture of the inner bore of the bearing roller.

9. The bearing roller load measuring sensor device according to claim 8, characterized in that: The end cap has an inner cavity, and the signal processing module is arranged in the inner cavity of the end cap.

10. An intelligent roller, comprising a bearing roller having an inner hole, characterized in that: A bearing roller load measuring sensor device comprising any one of claims 1 to 9.

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