Dynamic torque sensor

Abstract

The utility model belongs to the technical field of torque sensors, in particular to a dynamic torque sensor, which comprises a rotating shaft with a strain gauge and a sleeve rotationally connected onto the rotating shaft through a bearing, an inductor and a magnetic conductor are respectively arranged on the sleeve and the rotating shaft, and the magnetic conductor is electrically connected with the strain gauge to supply power to the strain gauge. A Bluetooth module is further arranged on the rotating shaft, and a strain bridge used for installing a strain gauge is further arranged on the rotating shaft and located between the two bearings. The non-contact type torque sensor is simple in structure and low in manufacturing cost, has the advantages of being capable of reliably, safely and effectively outputting the collected torque value dynamically in real time, is not prone to being interfered when collecting and outputting the torque value, and has the advantages of being simple in structure, convenient to use and high in reliability compared with an existing non-contact type torque sensor. And the torque detection requirements of high-speed operation and extremely high precision requirement can be met more easily.

Description

Technical Field

[0001] This utility model relates to the field of torque sensor technology, specifically to dynamic torque sensors. Background Technology

[0002] Dynamic torque sensors, as precision measuring instruments, are widely used in industrial production, scientific research, and daily life. With continuous technological advancements, non-contact dynamic torque sensors, due to their high precision, high reliability, and long lifespan, are gradually gaining an important position in the market and possess stable growth potential and broad development prospects.

[0003] The technical principle of dynamic torque sensors is mainly based on strain measurement, magnetoelectric conversion, and fiber optic technology. Strain gauge sensors utilize strain gauge electrical measurement technology to form a strain bridge on an elastic shaft, calculating torque by measuring the change in electrical signal generated when the elastic shaft is subjected to torsion. Magnetoelectric sensors measure torque by analyzing the phase difference between two output electromotive force signals. Furthermore, non-contact dynamic torque sensors employ wireless transmission technology, avoiding wear between the conductive slip ring and brush arm, improving measurement accuracy and reliability, and allowing direct integration into a PLC data acquisition system.

[0004] Current dynamic torque sensors primarily use mutual inductance coils for power supply. However, this method requires extremely high coaxiality during shaft rotation; otherwise, unstable power supply can lead to inaccurate readings. Therefore, the main solution to this problem currently lies in improving manufacturing precision. However, this undoubtedly increases production costs significantly, and given the current level of machining, it is difficult to achieve satisfactory results. Another solution is through compensation algorithms, but neither the final measurement results nor the real-time data transmission can be guaranteed, making it difficult to handle scenarios with extremely high precision requirements.

[0005] In addition, in some scenarios where torque needs to be measured and calculated in real time, the detected torque value needs to be output in a timely manner. However, in actual application scenarios, there may be significant electromagnetic interference, especially in areas with busy communication. This makes it very easy for the dynamic output of the detected value to be affected when detecting torque at ultra-high speeds, thus limiting the applicability of current dynamic torque sensors.

[0006] In order to meet the needs of current advanced technology development, this application proposes a dynamic torque sensor that can accurately output torque values ​​under high speed conditions. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a dynamic torque sensor, which solves the problem that current non-contact torque sensors cannot meet the torque detection requirements of high-speed operation and extremely high accuracy.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a dynamic torque sensor, comprising a rotating shaft with strain gauges and a sleeve rotatably connected to the rotating shaft via bearings, wherein the sleeve supplies power to the strain gauges via electromagnetic induction, the rotating shaft is also provided with a Bluetooth module, and a strain bridge for mounting the strain gauges is also provided on the rotating shaft and located between the two bearings.

[0009] Preferably, the strain bridge is cross-shaped.

[0010] Preferably, the strain bridge is plate-shaped.

[0011] Preferably, the edge of the strain bridge has a notch.

[0012] Preferably, it also includes an inner shell fitted onto the rotating shaft, with both the Bluetooth module and the bearing located on the inner shell.

[0013] Preferably, the Bluetooth module supports the 2.4GHz and 5GHz communication frequency bands.

[0014] Preferably, it also includes a housing fixedly connected to the sleeve, and the housing is provided with a power interface.

[0015] Preferably, the power interface also integrates a communication interface, and the sleeve is also provided with a receiving module that communicates with the Bluetooth module, and the receiving module is connected to the communication interface.

[0016] Preferably, the housing includes a bottom frame and a top cover that are detachably connected to each other, the power interface is located inside the top cover, and the side wall of the bottom frame is provided with a hole through which a rotating shaft can pass.

[0017] Preferably, the sleeve and the rotating shaft are respectively provided with an inductor and a magnetic conductor to realize electromagnetic induction, and the magnetic conductor is electrically connected to the strain gauge.

[0018] Compared with the prior art, the present invention provides a dynamic torque sensor, which has the following advantages:

[0019] This dynamic torque sensor has a simple structure and low manufacturing cost. It is characterized by its ability to reliably, safely, and effectively output the collected torque value in real time. Furthermore, it is not easily affected by interference when collecting and outputting torque values. Compared with current non-contact torque sensors, it is easier to meet the torque detection requirements of high-speed operation and extremely high accuracy. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the overall three-dimensional structure of the dynamic torque sensor.

[0021] Figure 2 This is a left view of the structure of this dynamic torque sensor;

[0022] Figure 3 This is a three-dimensional structural diagram of the dynamic torque sensor.

[0023] Figure 4 This is a schematic diagram of the structure of the rotating shaft in this dynamic torque sensor;

[0024] Figure 5 This is a three-dimensional structural diagram of another embodiment of the rotating shaft in this dynamic torque sensor.

[0025] In the diagram: 1. Shaft; 11. Strain gauge bridge; 12. Notch; 13. Magnetic conductor; 2. Sleeve; 21. Inductor; 3. Bluetooth module; 4. Inner shell; 5. Receiver module; 6. Outer shell; 61. Bottom frame; 62. Top cover; 63. Hole; 7. Power interface; 8. Bearing. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1:

[0028] Please see Figure 1-3 The present invention provides the following technical solution: a dynamic torque sensor, including a rotating shaft 1 with a strain gauge and a sleeve 2 rotatably connected to the rotating shaft 1 via a bearing. An inductor 21 and a magnetic conductor 13 are respectively provided on the sleeve 2 and the rotating shaft 1. The magnetic conductor 13 is electrically connected to the strain gauge to provide power to the strain gauge. A Bluetooth module 3 is also provided on the rotating shaft 1. A strain bridge 11 for mounting the strain gauge is also provided on the rotating shaft 1 and located between the two bearings.

[0029] As an optional embodiment of the present invention, the rotating shaft 1 is used to connect the shaft to be measured, and the sleeve 2 is used to fix it to a non-rotating part outside the shaft to be measured, or a part that does not rotate synchronously with the shaft to be measured; when the shaft to be measured rotates, electromagnetic induction is generated between the rotating shaft 1 and the sleeve 2, thereby energizing the strain gauge, so as to detect the real-time torque when the rotating shaft 1 rotates, and then output the real-time torque value through the Bluetooth module 3.

[0030] Throughout the testing process, since the sleeve 2 and the rotating shaft 1 are rotatably connected, and the electromagnetic induction method is different from the mutual inductance coil method, since the two bearings are brushless, there will be no significant wear. This minimizes the wear impact between the rotating shaft 1 and the sleeve 2. Since coaxiality is not required, the current is more stable, ensuring that the measured torque value is accurate. Of course, the precision requirements of machining are not so important, which can save a lot of manufacturing costs. Moreover, this can be assembled as a "permanent part" in industrial equipment or automobiles and other scenarios, with a long service life.

[0031] Because Bluetooth module 3 is used, Bluetooth communication typically supports data transmission in the UHF band. The dynamic data source generated under the condition of high-speed rotation of shaft 1 is quite large. Bluetooth communication can solve this problem well, ensuring data real-time performance. At the same time, Bluetooth technology itself can also ensure data validity and security by optimizing data packet size, using frequency hopping spread spectrum technology, strengthening encryption and authentication, introducing acknowledgment and retransmission mechanisms, and improving transmission power and antenna gain, thus having strong data transmission efficiency.

[0032] In addition, since torque sensors are usually installed between the power source and the load, the strain gauge in this technical solution is installed between two bearings. This allows the two ends of the shaft 1 to rotate freely. Therefore, the resistance to deformation of both the measured shaft and the shaft 1 itself is small, ensuring that the detected torque value is closer to the true value.

[0033] The above structure provides a simple and low-cost torque sensor that can reliably, safely, and effectively output the collected torque values ​​in real time. It is also less susceptible to interference when collecting and outputting torque values. Compared with current non-contact torque sensors, it is easier to meet the torque detection requirements of high-speed operation and extremely high accuracy.

[0034] like Figure 4 As shown, the strain gauge 11 is plate-shaped, and the edge of the strain gauge 11 is provided with a notch 12. This makes the strain gauge 11 easier to deform, and the value detected by the strain gauge is the actual torque value, which is suitable for detection applications with slightly lower power.

[0035] like Figure 2-3 As shown, it also includes an inner shell 4 sleeved on the rotating shaft 1. The Bluetooth module 3 and the bearing are both mounted on the inner shell 4. The inner shell 4 is fixedly sleeved on the rotating shaft 1 to prevent the inner ring of the bearing from slipping and causing friction that would affect the magnetoelectric conversion efficiency and torque detection value.

[0036] Specifically, Bluetooth module 3 supports 2.4GHz and 5GHz communication bands.

[0037] As an optional embodiment of the present invention, the corresponding receiving module 5 is directly mounted on the sleeve 2, which makes the positional distance from the Bluetooth module 3 relatively small. Under the condition of one-to-one encrypted communication, this further reduces the possibility of co-channel interference, and frequency modulation can be directly used to avoid interference if the bandwidth allows. Therefore, the anti-interference capability is extremely strong, and it can effectively avoid various interferences to ensure the effectiveness, security and real-time performance of data transmission. In addition, the 2.4 GHz ISM band is suitable for industrial, scientific and medical applications, while the 5 GHz band supports broadband wireless access and connection. Therefore, this dynamic torque sensor can cover most fields with high-speed torque measurement requirements, making its application range quite wide.

[0038] like Figure 1-3 As shown, it also includes a housing 6 fixedly connected to the sleeve 2. The housing 6 is provided with a power interface 7. The housing 6 includes a bottom frame 61 and a top cover 62 that are detachably connected to each other. The power interface 7 is located inside the top cover 62. The side wall of the bottom frame 61 is provided with a hole 63 through which the rotating shaft 1 can pass. The housing 6 encapsulates the entire torque sensor, providing external assembly function and protection function for internal components. The housing 6 is made of metal material, which can shield external interference and thus provide better anti-interference performance for internal data transmission. The power interface 7 provides power for magnetoelectric conversion, thereby providing the power required for the entire torque sensor to work.

[0039] like Figure 1-3 As shown, the power interface 7 also integrates a communication interface, and the sleeve 2 is also equipped with a receiving module 5 that communicates with the Bluetooth module 3. The receiving module 5 is connected to the communication interface. When there is a lot of interference in the application environment, or when the application scenario location is constantly changing, the receiving module 5 can be directly placed on this torque sensor to reduce the data transmission distance, ensure the reliability, stability and efficiency of data transmission, and provide a physical interface for external bandwidth access, wireless connection and other methods. Therefore, this torque sensor has expandability and a wide range of applications.

[0040] Example 2:

[0041] like Figure 5 As shown, the difference from Embodiment 1 is that the strain bridge 11 is cross-shaped.

[0042] As an optional embodiment of this utility model, the strain bridge 11 has higher strength and is suitable for detection applications with high dynamics.

[0043] The working principle and usage process of this utility model are as follows: When the shaft being measured rotates, electromagnetic induction is generated between the shaft 1 and the sleeve 2, which energizes the strain gauge, thereby enabling the detection of the real-time torque when the shaft 1 rotates. The real-time torque value is then output through the Bluetooth module 3.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dynamic torque sensor, comprising a rotating shaft with a strain gauge and a sleeve rotatably connected to the rotating shaft via a bearing, wherein the sleeve supplies power to the strain gauge via electromagnetic induction, characterized in that, The rotating shaft is also equipped with a Bluetooth module, and a strain bridge for mounting strain gauges is also provided on the rotating shaft and located between the two bearings. The strain bridge is cross-shaped.

2. The dynamic torque sensor according to claim 1, characterized in that, The strain bridge is plate-shaped.

3. The dynamic torque sensor according to any one of claims 1-2, characterized in that, The strain bridge has a notch at its edge.

4. The dynamic torque sensor according to claim 3, characterized in that, It also includes an inner shell fitted onto the rotating shaft, with both the Bluetooth module and the bearing located on the inner shell.

5. The dynamic torque sensor according to claim 1, characterized in that, The Bluetooth module supports communication frequency bands of 2.4GHz and 5GHz.

6. The dynamic torque sensor according to claim 1, characterized in that, It also includes a housing fixedly connected to the sleeve, and the housing is provided with a power interface.

7. The dynamic torque sensor according to claim 6, characterized in that, The power interface also integrates a communication interface, and the sleeve is also provided with a receiving module that communicates with the Bluetooth module. The receiving module is connected to the communication interface.

8. The dynamic torque sensor according to claim 6, characterized in that, The housing includes a bottom frame and a top cover that are detachably connected to each other. The power interface is located inside the top cover, and the side wall of the bottom frame has a hole through which a rotating shaft can pass.

9. The dynamic torque sensor according to claim 1, characterized in that, The sleeve and the rotating shaft are respectively equipped with an inductor and a magnetic conductor to achieve electromagnetic induction, and the magnetic conductor is electrically connected to the strain gauge.

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