Wireless load monitoring device and method for differential planetary gear transmission system

Abstract

The invention discloses a wireless load monitoring device and method for a differential planetary gear transmission system, and relates to the technical field of mechanical transmission testing. The invention aims to solve the problems that when a strain gauge is pasted on a tooth, the pasting position of the strain gauge is not accurate and is not firm, and a lead is wound and fractured in the existing uniform load testing device. A strain gauge set (22) is installed on the radial surface of a planet carrier assembly (6) of the differential planetary gear transmission system and monitors loads in real time, and a wireless transmission assembly is connected with the strain gauge set (22) through a data line set and outputs monitoring signals. And the strain gauge groups (22) are adhered to the outer circumferential surface of the planet carrier assembly (6) in a circumferential array arrangement mode. The method comprises the steps of processing a cable mounting hole, mounting a monitoring device and starting a system for real-time monitoring. According to the invention, the accuracy and reliability of monitoring are improved, and the method is used for online real-time load measurement of the differential planetary gear transmission system.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical transmission testing, and in particular to a wireless load monitoring device and method for a differential planetary gear transmission system, which is used for online real-time load measurement of a differential planetary gear transmission system. Background Art

[0002] Planetary gear transmissions, with their compact structure, large transmission ratio, and high power density, have garnered widespread attention and acclaim within the industry. However, due to manufacturing and installation errors and torque fluctuations, load sharing in planetary gear transmissions is complex, directly impacting transmission reliability and service life. Power splitting and load sharing are key to planetary gear transmission design. Monitoring the forces acting on the planetary gears is one of the most direct methods for analyzing the load sharing performance of planetary gear transmissions.

[0003] In a planetary gear transmission, any planetary gear transmission in which the three basic components, namely the sun gear, the inner ring gear, and the planet carrier, can all rotate is called a differential planetary gear transmission. In a differential planetary gear transmission, since the sun gear, the inner ring gear, and the planet carrier all rotate, this brings great difficulties to the testing of the planetary gear load. Usually, strain gauges are attached to the planetary gear tooth surfaces to measure the stress and deformation of the planetary gear. For example: the announcement number is CN118362303A, and the patent name is: An invention patent for a planetary gear transmission uniform load test device and its installation and testing method. It divides the teeth on the sun gear into equal parts and selects one or more teeth in each equally divided tooth to install a strain gauge group. It can not only accurately collect dynamic loads in real time, but also ensure that the mass distribution of the sun gear is uniform under both static and dynamic conditions, so that the overall operation of the device is stable and the test results are accurate.

[0004] However, in actual applications, the existing technology has the following problems: 1. The strain gauge is not pasted in an accurate position: Due to the small space on the planetary gear tooth surface, it is difficult to ensure the accurate position of the strain gauge when pasting it, resulting in inaccurate test data. For example, the deviation in the pasting position may cause the measurement error to reach more than 10%, affecting the accurate evaluation of the load-sharing performance. 2. The strain gauge is not firmly pasted: The small space on the tooth surface makes the strain gauge susceptible to mechanical interference during the pasting process, resulting in loose pasting. During long-term operation, the strain gauge may fall off, resulting in a test failure rate of up to 20%. 3. Lead entanglement and breakage problems: The traditional lead method is prone to lead entanglement and breakage problems in the differential planetary gear transmission system, affecting the normal operation of the system.

[0005] In summary, when the existing load-sharing test device is used to stick strain gauges on the teeth, there are problems such as inaccurate and loose sticking positions of the strain gauges, as well as entanglement and breakage of the leads. Summary of the Invention

[0006] The object of the present invention is to solve the problems of inaccurate and insecure bonding positions of strain gauges, as well as winding and breakage of leads when strain gauges are bonded to teeth in existing load sharing test devices. Furthermore, a wireless load monitoring device and method for a differential planetary gear transmission system are provided.

[0007] The technical solution of the present invention is as follows:

[0008] The present invention provides a wireless load monitoring device for a differential planetary gear transmission system, which includes a plurality of strain gauge groups. It also includes a plurality of data line groups equal in number to the strain gauge groups. The plurality of strain gauge groups are installed on the radial surface of the output shaft of the planet carrier assembly of the differential planetary gear transmission system and monitor the load in real time. The wireless transmission component is connected to the strain gauge groups through the data line groups and outputs the monitoring signal.

[0009] Furthermore, the planet carrier assembly includes a planet carrier body and an output shaft. The planet carrier body and the output shaft are coaxially connected by a plurality of bolts from right to left.

[0010] Even further, the strain gauge groups are bonded to the radial surface of the output shaft, and the strain gauge groups face the housing of the differential planetary gear transmission system.

[0011] Preferably, the plurality of strain gauge groups are bonded to the radial surface of the output shaft in a circumferential array arrangement.

[0012] Furthermore, the multiple data lines in each data line group are sequentially connected and embedded in the output shaft.

[0013] Preferably, the wireless transmission component is a Bluetooth, infrared transmission or inductive coupling component.

[0014] Furthermore, the inductive coupling component includes a stationary ring and a rotating ring. The stationary ring and the rotating ring are sleeved on the output shaft.

[0015] Even further, a plurality of "U" - shaped through - holes are provided in the circumferential direction of the output shaft. The head end of the data line group is connected to the strain gauge group, and the tail end of the data line group passes through the "U" - shaped through - holes and is connected to the rotating ring.

[0016] The present invention also provides a monitoring method using a wireless load monitoring device for a differential planetary gear transmission system, which includes the following steps:

[0017] Step 1: Process the cable installation holes;

[0018] A plurality of "U" - shaped through - holes are opened on the output shaft, and cable through - holes communicating with the "U" - shaped through - holes are opened on the fixed - distance ring.

[0019] Step 2: Install the wireless load monitoring device for the differential planetary gear transmission system;

[0020] The strain gauge group is installed on the radial surface of the output shaft. The stationary ring and the rotating ring are sleeved on the output shaft, and then the data line group is passed through the "U"-shaped through hole and the cable through hole and connected to the rotating ring;

[0021] Step 3: Start the differential planetary gear transmission system;

[0022] Start the differential planetary gear transmission system, and transmit the data signal in real time from the rotating ring with the transmitting coil to the stationary ring with the wireless receiving coil through wireless transmission, and the on-line real-time measurement of the load can be realized.

[0023] Furthermore, the differential planetary gear transmission system in Step 3 includes a differential planetary gear transmission device and a wireless load monitoring device; the differential planetary gear transmission device includes a planet carrier assembly, a floating shaft, a sun gear, a planetary gear bearing, a planetary gear, an internal gear ring, a first bearing, a bearing seat, a floating gear ring and an input shaft; the sun gear is sleeved on the floating shaft, the planetary gear bearing is installed on the planet carrier assembly, the planetary gear is sleeved on the planetary gear bearing and meshes with the sun gear, the first bearing is installed in the bearing seat and sleeved on the planet carrier body, the input shaft is coaxially sleeved on the floating shaft, and the internal gear ring meshes with the planetary gear; the floating gear ring is sleeved on the input shaft, the internal teeth of the floating gear ring mesh with the input shaft, and the external teeth of the floating gear ring mesh with the internal gear ring; the wireless load monitoring device is installed on the output shaft of the planet carrier assembly.

[0024] Even further, the differential planetary gear transmission device further includes an output flange, a spacer ring, an end cover, a second bearing and a housing. The housing and the output shaft are connected by the second bearing. The end cover is installed on the housing by bolts. The output flange is installed at the end of the output shaft. The spacer ring is sleeved on the output shaft between the output flange and the second bearing. The inductive coupling assembly is sleeved on the output shaft through the spacer ring.

[0025] Preferably, the strain gauge group in Step 2 is a resistive strain gauge group.

[0026] The present invention has the following effects compared with the prior art:

[0027] 1. The test object of the present invention is the differential planetary gear transmission system, and the motion state of the differential planetary gear transmission system is that the sun gear, the internal gear ring and the planet carrier all rotate (differential characteristics). This results in problems such as lead wire entanglement or breakage when using the traditional lead wire method to measure the load in real time. In order to overcome this technical problem, the present invention uses wireless telemetry technology for real-time monitoring. It avoids the disadvantages of using the lead wire method for measurement.

[0028] 2. The strain gauge group of the present invention is preferably installed on the radial surface of the planet carrier assembly by pasting. The installation space is large, it is easy to operate, and it does not affect the normal meshing of the gears. It indirectly reflects the load distribution of the planetary gears by measuring the deformation of the planet carrier.

[0029] That is to say, the position where the strain gauge of the present invention is installed realizes the real-time measurement of the planetary gear load through an indirect measurement method. This avoids the problems existing in the traditional method of directly pasting the strain gauge on the tooth surface of the sun gear, such as the narrow space at the tooth root of the gear, the difficulty in pasting, inaccurate pasting position, and insecure pasting.

[0030] 3. The present invention uses a wireless transmission method for real-time load monitoring. This wireless transmission means is achieved through the coordinated action between the stationary ring and the rotating ring, the data line group, and the strain gauge group. It not only solves the technical problems existing in using lead wires to measure the load in the differential planetary gear transmission system, but also does not require additional counterweights, the inertia distribution of the system is more uniform, and it can not only monitor the change of the load in real time, but also give early warnings of faults in a timely manner. Brief Description of the Drawings

[0031] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0032] In the figure: 1. Output flange, 2. Spacer ring, 3. End cover, 4. Second bearing, 5. Housing, 6. Planet carrier assembly, 61. Planet carrier body, 62. Output shaft, 63. "U"-shaped through hole, 7. Floating shaft, 8. Sun gear, 9. Planet gear bearing, 10. Planet gear, 11. Internal gear ring, 第十二条 第一轴承,13. Bearing seat, 14. Floating gear ring, 15. Input shaft, 16. Stationary ring, 17. Bolt, 18. Rotating ring, 19. First data line, 20. Second data line, 21. Third data line, 22. Strain gauge group. Detailed Embodiments

[0033] Detailed Embodiment 1: In combination with Figure 1 This embodiment is described. A wireless load monitoring device for a differential planetary gear transmission system in this embodiment includes a plurality of strain gauge groups 22, and it also includes a plurality of data line groups equal in number to the strain gauge groups 22. The plurality of strain gauge groups 22 are installed on the radial surface of the output shaft 62 of the planet carrier assembly 6 of the differential planetary gear transmission system and monitor the load in real time. The wireless transmission component is connected to the strain gauge groups 22 through the data line groups and outputs monitoring signals. Among them, each strain gauge group 22 is connected to a data line group. <able>

[0034] The present invention changes the installation position of the strain gauge groups 22. Compared with the traditional method of pasting at the tooth root, the present invention avoids the problems of narrow space, inaccurate pasting position, and insecure pasting.

[0035] The wireless transmission assembly in this embodiment connects to the strain gauge assembly 22 via a data cable assembly, transmitting the monitored load signals in real time to a receiving device for centralized management and analysis. This helps to promptly understand the system's operating status, identify potential overloads or abnormalities, and take appropriate measures to prevent equipment damage and failure. It also avoids the complex wiring, susceptibility to interference, and data cable entanglement and breakage associated with traditional wired transmission, improving the system's flexibility and reliability. Furthermore, wireless transmission enables real-time transmission of monitoring data to a remote monitoring center.

[0036] This embodiment realizes dynamic monitoring through wireless transmission based on the correlation between the deformation of the planet carrier and the load of the planetary gear.

[0037] Specific implementation method 2: Combination Figure 1 To describe this embodiment, the planet carrier assembly 6 of this embodiment includes a planet carrier body 61 and an output shaft 62 , and the planet carrier body 61 and the output shaft 62 are coaxially connected from right to left by a plurality of bolts.

[0038] Such an arrangement has a simple structure, is easy to produce and process, and can provide necessary structural support for embedding the data cable.

[0039] This embodiment utilizes a coaxial connection between the planet carrier body 61 and the output shaft 62 to ensure the structural stability of the entire planet carrier assembly 6. A stable structure is essential for ensuring efficient and reliable operation of a planetary gear transmission system. This design can reduce vibration and noise caused by structural instability, thereby improving overall system performance.

[0040] The coaxial connection ensures precise mechanical transmission between the planet carrier body 61 and the output shaft 62, reducing transmission errors, improving transmission efficiency, minimizing energy loss, and improving overall system efficiency. It also ensures even load distribution between the planet carrier body 61 and the output shaft 62, reducing local overloads. This uniform load distribution improves overall system performance, reduces damage caused by local overloads, and increases system reliability and service life.

[0041] Specific implementation method three: Combination Figure 1 To describe this embodiment, the strain gauge group 22 of this embodiment is adhered to the radial surface of the output shaft 62 , and the strain gauge group 22 faces the housing 5 of the differential planetary gear transmission system.

[0042] The specific steps of attaching the strain gauge group 22 in this embodiment are as follows:

[0043] First, the radial surface of the planetary carrier assembly 6 was pretreated: (1) the bonding area was polished with 400-600 grit sandpaper, and the surface roughness was controlled at Ra1.6-3.2 μm; (2) acetone and anhydrous ethanol were used for ultrasonic cleaning for 10 minutes to remove oil stains; (3) the surface was treated with a plasma treatment device (power 200 W, time 2 minutes) before bonding to increase activity.

[0044] The strain gauge group 22 is glued with modified epoxy resin adhesive, with a viscosity of 1500±200 centipoise at an ambient temperature of 25°C, a shear strength of ≥18MPa, and a temperature resistance range of -55°C to 150°C to adapt to the working conditions of the gearbox.

[0045] After pasting, cure according to the following steps: (1) Apply 0.2-0.5MPa pressure to remove bubbles; (2) Cure at 80℃ for 90 minutes; (3) Cool naturally to room temperature and test the resistance change rate (should be <0.5%).

[0046] After the strain gauge set 22 is bonded, a 20-hour vibration test (frequency 50 Hz, acceleration 10g) is conducted. If the signal fluctuation amplitude is less than 2%, the bond reliability is confirmed. Once this meets the requirements, load monitoring can be performed.

[0047] This arrangement creates a relatively large and flat surface on the planetary carrier assembly 6, allowing for a more controlled number and placement of strain gauge groups 22, resulting in a more secure attachment. Furthermore, by installing multiple strain gauge groups 22 on the planetary carrier assembly 6, the forces acting on them better reflect the overall load distribution. Conventional load measurement methods, which install strain gauges on the sun gear tooth roots, only reflect the forces acting on a single gear. Furthermore, this embodiment provides a more stable and easier-to-maintain mounting method for the strain gauge groups 22, eliminating the need for frequent strain gauge replacement.

[0048] This embodiment improves monitoring accuracy. Because the radial surface near and facing the housing 5 typically has a more stable structure and is less susceptible to external interference, this helps improve the accuracy of load data monitored by the strain gauge assembly 22. Accurate load monitoring data is crucial for assessing system operating status and providing fault warnings. By installing the strain gauge assembly 22 in a stable location, measurement errors caused by improper positioning can be reduced, thereby ensuring the reliability of the monitoring data.

[0049] This embodiment can also play a role in reducing external interference. The position close to the box body 5 is usually less subject to external mechanical interference, such as vibration, impact, etc., which helps to reduce the impact of these interferences on the monitoring data of the strain gauge group 22. Reducing external interference can improve the purity of the monitoring data, avoid misjudgment or data distortion caused by interference, and thus more accurately reflect the actual load conditions. At the same time, the position close to the box body 5 is usually close to the wireless transmission component (such as the inductive coupling component), which helps to reduce the attenuation and interference during the signal transmission process and improve the stability of the signal transmission. Stable signal transmission is the key to ensuring that the monitoring data can be accurately and timely transmitted to the receiving device. Reducing the attenuation and interference during the signal transmission process can improve the overall performance of the system and ensure the real-time and reliability of the monitoring data.

[0050] Specific implementation method four: Combination Figure 1 In this embodiment, multiple strain gauge groups 22 are attached to the radial surface of the output shaft 62 in a circular array. This arrangement ensures that the load of the differential planetary gear transmission system can be measured from the perspective of the entire system, resulting in more comprehensive and objective measurement results.

[0051] The number of strain gauge groups 22 in this embodiment is preferably 6-40, enabling comprehensive monitoring of the load distribution at various locations on the planetary carrier assembly. This facilitates measurement of load conditions at various locations and provides dynamic monitoring data. This avoids the inaccurate load data associated with traditional tooth root strain gauges due to inaccurate or loose attachment positions. Furthermore, this arrangement provides more comprehensive load distribution data, helping to identify uneven loading or localized overloads, enabling more accurate assessment of the system's operating status. It also improves the reliability and accuracy of monitoring data, ensuring the accuracy of monitoring results.

[0052] Specific implementation method five: Combination Figure 1 To illustrate this embodiment, multiple data lines in each data line group are sequentially connected and embedded within the output shaft 62. The data lines in this embodiment are all multi-strand twisted wires, covered with an insulating layer, and sequentially connected and embedded within the output shaft 62. The data line group includes a first data line 19, a second data line 20, and a third data line 21, which are sequentially connected.

[0053] With this configuration, the data line is mainly used to output the collected data signal.

[0054] In this embodiment, multiple data cables are installed in an embedded manner. This installation method is a concealed cable arrangement, which effectively avoids the problem of data cable entanglement or breakage, and does not affect the normal rotation of the entire differential planetary gear transmission system, ensuring long-term real-time monitoring and improving the efficiency of load monitoring.

[0055] This embodiment, by embedding the data cable assembly, can protect the data cables from external mechanical interference, such as vibration and friction, during operation, thereby reducing wear and damage to the data cables. Improving the reliability of the data cables ensures stable transmission of monitoring signals, avoiding interruptions or distortion of monitoring data due to data cable failures, thereby improving the reliability of the entire monitoring system. It also reduces external electromagnetic interference, ensuring the purity of signal transmission. Reducing electromagnetic interference improves the accuracy and stability of monitoring data, avoiding misjudgments or data distortion caused by external electromagnetic interference, and thus more accurately reflects actual load conditions.

[0056] The embedded data cable assembly in this embodiment effectively utilizes the internal space of the planetary carrier assembly 6, reducing the space required for external wiring and making the entire device more compact. This compact design improves system integration, reduces installation space requirements, and is suitable for space-constrained industrial applications, enhancing the system's applicability. It also protects the data cables from exposure to the external environment, reducing damage to them due to environmental factors such as high temperature, humidity, and corrosive gases. Improving the environmental resistance of the data cables also ensures stable operation of the monitoring system even under harsh operating conditions, improving overall system security.

[0057] In addition, this embodiment is tightly integrated with the structure of the planetary carrier assembly 6, reducing signal transmission problems caused by loose or shifted data cables. This tight integration can improve the overall performance of the system, ensure the efficient and stable operation of the monitoring system, and improve the overall performance and reliability of the system.

[0058] Specific implementation method six: combination Figure 1 To illustrate this embodiment, the wireless transmission component of this embodiment is a Bluetooth, infrared transmission or inductive coupling component.

[0059] With this setting, the load data signal can be output in real time through wireless transmission, the output is more stable, possible failure risks can be discovered in time, and timely warnings can be issued.

[0060] In this embodiment, when Bluetooth is used as the wireless transmission method, the Bluetooth wireless transmission component wirelessly transmits the load data signals collected by the strain gauge assembly 22 to a receiving device. Bluetooth technology enables low-latency, stable, real-time data transmission, ensuring timely transmission of monitoring data to the receiving device. Bluetooth modules typically have low power consumption, making them suitable for long-term monitoring systems and reducing energy consumption. They are widely used in various devices and have good compatibility, allowing for convenient connection with a variety of receiving devices (such as smartphones, tablets, and computers).

[0061] In this embodiment, infrared transmission is used as the wireless transmission method. Infrared transmission operates within a specific frequency range and is not susceptible to interference from other wireless signals, ensuring stable data transmission. Infrared transmission modules typically have low power consumption, making them suitable for long-term monitoring systems. Infrared signals are highly directional and difficult to intercept by other devices, improving data transmission security. Furthermore, infrared transmission's low interference characteristics can reduce errors and loss during data transmission, improving system reliability.

[0062] The inductive coupling assembly of this embodiment enables contactless communication between the strain gauge group and the external device.

[0063] Specific implementation method seven: combination Figure 1 To describe this embodiment, the inductive coupling assembly of this embodiment includes a stationary ring 16 and a rotating ring 18 . The stationary ring 16 and the rotating ring 18 are sleeved on the output shaft 62 .

[0064] With this setup, signals are transmitted via contactless electromagnetic induction, eliminating the need for physical connecting wires and completely solving the wiring problem for rotating components.

[0065] The inductive coupling assembly of this embodiment is particularly suitable for high-speed, long-duration transmission systems (such as ships and wind turbine gearboxes). Data is wirelessly transmitted in real time to the stationary ring 16, enabling online monitoring of load distribution and timely detection of anomalies (such as eccentric loading and impact loading). It also reduces cable loosening and wear caused by centrifugal forces. Contactless transmission eliminates mechanical wear and extends service life.

[0066] Furthermore, the wireless transmitter module is compact and lightweight, minimally impacting the inertia of rotating components. This eliminates the need for additional counterweights, reducing the risk of system imbalance. Its sealed design (such as integration into the planetary carrier flange) resists oil and dust. With no exposed wiring, it is resistant to vibration and shock.

[0067] This embodiment is particularly suitable for use in a high-speed rotating mechanical system, which can ensure the stability of data transmission during high-speed operation. In a high-speed rotating differential planetary gear transmission system, the traditional wired transmission method may fail due to centrifugal force and vibration, while the inductive coupling component technology can effectively solve this problem and ensure the stable operation of the system. The wireless transmission method of this embodiment can also reduce electromagnetic interference and ensure the purity of signal transmission. Reducing electromagnetic interference can improve the accuracy and stability of monitoring data, avoid misjudgment or data distortion caused by external electromagnetic interference, and thus more accurately reflect the actual load situation.

[0068] Specific Embodiment Eight: Combine Figure 1 To illustrate this embodiment, the stationary ring 16 of this embodiment is fixedly installed on the end cover 3 in a stationary state that is connected to the box body 5.

[0069] With such a setting, it is convenient to ensure that the received signal is more accurate, not affected by factors such as vibration, and improve the accuracy of signal transmission.

[0070] Specific Embodiment Nine: Combine Figure 1 To illustrate this embodiment, the output shaft 62 of this embodiment is provided with a plurality of "U"-shaped through holes 63 in the circumferential direction. The head end of the data line group is connected to the strain gauge group 22, and the tail end of the data line group passes through the "U"-shaped through hole 63 and is connected to the rotating ring 18. With such a setting, it is convenient to embed the data line.

[0071] During the actual use of the "U"-shaped through hole 63 of this embodiment, a clearance fit relationship is adopted between the diameter of the through hole and the data line, which is convenient for the data line to be quickly installed in the "U"-shaped through hole 63. At the same time, during the high-speed rotation of the output shaft 62, there will be no vibration and interference problems under the action of centrifugal force, ensuring the accuracy of the measured data.

[0072] The width of the "U"-shaped through hole 63 is 5 mm, the corner ≥ 1 mm (to avoid stress concentration), the machining tolerance of the "U"-shaped through hole 63 is ±0.05 mm, the "U"-shaped through hole 63 is filled with a silicone bushing, and the gap between the cable of the data line and the hole wall ≤ 0.3 mm (to suppress vibration wear). It is convenient for the strain gauge group 22 to accurately transmit the signal to the inductive coupling component through the data line, and realize the real-time monitoring output of the load signal.

[0073] Specific Embodiment Ten: Combine Figure 1 To illustrate this embodiment, the monitoring method of this embodiment includes the following steps:

[0074] Step 1: Process the cable installation hole;

[0075] A plurality of "U"-shaped through holes 63 are formed on the output shaft 62, and a cable through hole communicating with the "U"-shaped through hole 63 is formed on the spacing ring 2.

[0076] Step Two: Install the wireless load monitoring device for the differential planetary gear transmission system.

[0077] The strain gauge group 22 is installed on the radial surface of the output shaft 62. The stationary ring 16 and the rotating ring 18 are sleeved on the output shaft 62, and then the data cable group is passed through the "U"-shaped through hole 63 and the cable through hole and connected to the rotating ring 18.

[0078] Step Three: Start the differential planetary gear transmission system.

[0079] Start the differential planetary gear transmission system, and transmit the data signal from the rotating ring 18 with the transmitting coil to the stationary ring 16 with the wireless receiving coil in real time through wireless transmission, and the online real-time measurement of the load can be realized.

[0080] The processing of the cable installation hole in this embodiment can ensure the reasonable layout of the data cable, improve the reliability of the system and the space utilization efficiency. Installing the monitoring device can ensure the correct installation of the strain gauge group 22 and the stable connection of the data cable, and improve the overall performance of the system.

[0081] Specific Embodiment Eleven: Combine Figure 1 To illustrate this embodiment, the differential planetary gear transmission system in Step Three of this embodiment includes a differential planetary gear transmission device and a wireless load monitoring device; the differential planetary gear transmission device includes a planet carrier assembly 6, a floating shaft 7, a sun gear 8, a planetary gear bearing 9, a planetary gear 10, an internal gear ring 11, a first bearing 12, a bearing seat 13, a floating gear ring 14 and an input shaft 15; the sun gear 8 is sleeved on the floating shaft 7, the planetary gear bearing 9 is installed on the planet carrier assembly 6, the planetary gear 10 is sleeved on the planetary gear bearing 9 and meshes with the sun gear 8, the first bearing 12 is installed in the bearing seat 13 and sleeved on the planet carrier body 61, the input shaft 15 is coaxially sleeved on the floating shaft 7, and the internal gear ring 11 meshes with the planetary gear 10; the floating gear ring 14 is sleeved on the input shaft 15, the internal teeth of the floating gear ring 14 mesh with the input shaft 15, and the external teeth of the floating gear ring 14 mesh with the internal gear ring 11; the wireless load monitoring device is installed on the output shaft 62 of the planet carrier assembly 6.

[0082] In this embodiment, by combining the wireless load monitoring device with the differential planetary gear transmission device, the real-time monitoring of the load of the differential planetary gear transmission system is realized. There is no need to stop the machine to export data, which improves the monitoring efficiency of the load and ensures the safe and effective operation of the transmission system.

[0083] Specific Embodiment Twelve: Combine Figure 1To describe this embodiment, the differential planetary gear transmission device of this embodiment further includes an output flange 1, a distance ring 2, an end cover 3, a second bearing 4 and a housing 5. The housing 5 and the output shaft 62 are connected via the second bearing 4. The end cover 3 is mounted on the housing 5 via bolts 17. The output flange 1 is mounted on the end of the output shaft 62. The distance ring 2 is mounted on the output shaft 62 between the output flange 1 and the second bearing 4. The inductive coupling assembly is mounted on the output shaft 62 via the distance ring 2.

[0084] This arrangement provides a carrier for the installation and safe and reliable operation of the wireless load monitoring device.

[0085] The distance ring 2 of this embodiment is used to accurately fix the axial position of the bearing or gear assembly, ensuring that the assembly clearance between transmission components (such as the planet carrier, sun gear, bearing, etc.) meets the design requirements.

[0086] The differential planetary gear system in this embodiment is sensitive to axial play. Excessive play can lead to poor gear meshing, while too little play can cause seizure or overheating. The thickness of the spacer ring 2 is precisely calculated (1-10mm) to ensure bearing preload and gear alignment accuracy.

[0087] Furthermore, as a rigid spacer, the spacer ring 2 shares some of the axial load, preventing uneven loading of transmission components. Placing the spacer ring 2 between the planetary carrier assembly 6 and the second bearing 4 or other fixed components evens out the load distribution and reduces the risk of uneven wear on the planetary gears 10. This stable axial support helps the strain gauges 22 attached to the surface of the planetary carrier body 61 more accurately reflect the actual load, preventing test data distortion caused by structural deformation.

[0088] This embodiment maintains the structural stability of the transmission system through the distance ring 2, indirectly ensuring the test accuracy of the strain gauge group 22 and the wireless transmission system (referring to the inductive coupling component), and is a key support component for the reliable operation of the differential planetary gear transmission.

[0089] Specific implementation method 13: Combination Figure 1 In this embodiment, the strain gauge set 22 in step 2 is a resistive strain gauge set. This arrangement can detect the minute deformations of an object under load and convert them into electrical signals. By measuring these electrical signals, the strain of the object can be calculated, thereby understanding the stress state of the object under load.

[0090] Combine Figure 1 The working principle of the present invention is described:

[0091] Several strain gauge groups 22 are pasted on the surface of the planetary carrier assembly 6 along a circumferential direction. The first data line 19 connecting the strain gauge groups 22 is fixed on the surface of the rotating planetary carrier assembly 6. The second data line 20 and the third data line 21 are fixed in the inner hole of the rotating planetary carrier assembly 6 and extend to the flange end of the output shaft 62 in the planetary carrier assembly 6. The third data line 21 is connected to the inductive coupling component with a wireless transmitting coil fixed on the output shaft 62. The stationary ring 16 with a wireless receiving coil is fixed on the stationary box 5, and the data signal is transmitted from the transmitting coil to the receiving coil in real time through wireless transmission.

[0092] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Those skilled in the art may also make other changes within the spirit of the present invention, and apply the present invention to fields not mentioned herein. Of course, these changes made in accordance with the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims

1. A wireless load monitoring device for a differential planetary gear transmission system, comprising a plurality of strain gauge groups (22), characterized in that: It also includes a plurality of data line groups equal in number to the strain gauge groups (22). The plurality of strain gauge groups (22) are mounted on the radial surface of the output shaft (62) of the planetary carrier assembly (6) of the differential planetary gear transmission system and monitor the load in real time. The wireless transmission component is connected to the strain gauge groups (22) through the data line groups and outputs the monitoring signal.

2. The wireless load monitoring device for a differential planetary gear transmission system according to claim 1, characterized in that: The planetary carrier assembly (6) includes a planetary carrier body (61) and an output shaft (62). The planetary carrier body (61) and the output shaft (62) are coaxially connected by a plurality of bolts from right to left.

3. The wireless load monitoring device for a differential planetary gear transmission system according to claim 2, characterized in that: The strain gauge groups (22) are pasted on the radial surface of the output shaft (62), and the strain gauge groups (22) face the housing (5) of the differential planetary gear transmission system.

4. The wireless load monitoring device for a differential planetary gear transmission system according to claim 3, characterized in that: The plurality of strain gauge groups (22) are pasted on the radial surface of the output shaft (62) in a circumferential array arrangement.

5. The wireless load monitoring device for a differential planetary gear transmission system according to claim 4, characterized in that: The multiple data lines in each data line group are sequentially connected and embedded in the output shaft (62).

6. The wireless load monitoring device for a differential planetary gear transmission system according to claim 5, characterized in that: The wireless transmission component is a Bluetooth, infrared transmission or inductive coupling component.

7. The wireless load monitoring device for a differential planetary gear transmission system according to claim 6, characterized in that: The inductive coupling component includes a stationary ring (16) and a rotating ring (18). The stationary ring (16) and the rotating ring (18) are sleeved on the output shaft (62).

8. The wireless load monitoring device for a differential planetary gear transmission system according to claim 7, characterized in that: The output shaft (62) is provided with a plurality of "U"-shaped through holes (63) in the circumferential direction. The head end of the data line group is connected to the strain gauge group (22), and the tail end of the data line group passes through the "U"-shaped through hole (63) and is connected to the rotating ring (18).

9. A monitoring method using the wireless load monitoring device for a differential planetary gear transmission system according to claim 8, characterized in that: It includes the following steps: Step 1: Process the cable installation holes; A plurality of "U"-shaped through holes (63) are opened on the output shaft (62), and cable through holes communicating with the "U"-shaped through holes (63) are opened on the spacing ring (2). Step 2: Install the wireless load monitoring device of the differential planetary gear transmission system; The strain gauge groups (22) are installed on the radial surface of the output shaft (62). The stationary ring (16) and the rotating ring (18) are sleeved on the output shaft (62), and then the data line group passes through the "U"-shaped through hole (63) and the cable through hole and is connected to the rotating ring (18). Step 3: Start the differential planetary gear transmission system; Start the differential planetary gear transmission system, and transmit the data signal in real time from the rotating ring (18) with a transmitting coil to the stationary ring (16) with a wireless receiving coil through wireless transmission, so as to realize online real-time measurement of the load.

10. The monitoring method using a wireless load monitoring device of a differential planetary gear transmission system according to claim 9, characterized in that: The differential planetary gear transmission system in step 3 includes a differential planetary gear transmission device and a wireless load monitoring device; the differential planetary gear transmission device includes a planetary carrier assembly (6), a floating shaft (7), a sun gear (8), a planetary gear bearing (9), a planetary gear (10), an inner ring gear (11), a first bearing (12), a bearing seat (13), a floating ring gear (14) and an input shaft (15); the sun gear (8) is mounted on the floating shaft (7), the planetary gear bearing (9) is mounted on the planetary carrier assembly (6), and the planetary gear (10) is mounted on the planetary gear The first bearing (12) is mounted in the bearing seat (13) and is mounted on the planetary carrier body (61). The input shaft (15) is coaxially mounted on the floating shaft (7). The inner gear ring (11) is engaged with the planetary gear (10). The floating gear ring (14) is mounted on the input shaft (15). The inner teeth of the floating gear ring (14) are engaged with the input shaft (15). The outer teeth of the floating gear ring (14) are engaged with the inner gear ring (11). The wireless load monitoring device is mounted on the output shaft (62) of the planetary carrier assembly (6).

11. The monitoring method using a wireless load monitoring device of a differential planetary gear transmission system according to claim 10, characterized in that: The differential planetary gear transmission device further comprises an output flange (1), a distance ring (2), an end cover (3), a second bearing (4) and a housing (5), wherein the housing (5) and the output shaft (62) are connected via the second bearing (4), the end cover (3) is mounted on the housing (5) via bolts (17), the output flange (1) is mounted on the end of the output shaft (62), the distance ring (2) is sleeved on the output shaft (62) between the output flange (1) and the second bearing (4), and the inductive coupling assembly is sleeved on the output shaft (62) via the distance ring (2).

12. The monitoring method using a wireless load monitoring device of a differential planetary gear transmission system according to claim 9, characterized in that: The strain gauge group (22) in step 2 is a resistance strain gauge group.

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