Planetary gear monitoring device

Abstract

The invention discloses a planetary gear monitoring device, and belongs to the technical field of gearbox monitoring, a gearbox comprises a box body, a planet carrier and a planet wheel, the planet carrier and the planet wheel are arranged in the box body, the planet wheel is rotatably connected with the planet carrier, the planetary gear monitoring device comprises a power generation assembly and a monitoring assembly, and the power generation assembly comprises a piezoelectric power generation piece. The piezoelectric power generation piece is arranged on the planet wheel and / or the planet carrier, and the piezoelectric power generation piece generates electric energy under the vibration effect of the planet wheel and / or the planet carrier; the monitoring assembly comprises a circuit board and a plurality of sensors, the sensors are electrically connected with the circuit board, the power generation assembly provides electric energy for the circuit board, and the sensors comprise a displacement sensor, a vibration sensor and a temperature sensor. Through cooperation of the piezoelectric power generation piece and the sensor, vibration energy is fully utilized, information of the planetary gear can be monitored, the fault rate is reduced, a battery does not need to be arranged, and energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox monitoring, and in particular to a planetary gear monitoring device. Background Art

[0002] Gearboxes are commonly used transmission mechanisms. Gearboxes may fail during operation. Due to the internal structure of the gearbox being sealed, it is difficult to detect internal faults in a timely manner during daily inspections. Frequent removal of the gearbox observation hole cover or plug is time-consuming and laborious, which will affect its sealing, causing oil leakage or gearbox oil contamination. Sensors are usually used to monitor the status of the gearbox, and batteries are used to power the sensors. Battery replacement is difficult, which leads to high fault monitoring costs.

[0003] Planetary gear transmission has the advantages of small size, compact structure, strong load-bearing capacity and high transmission efficiency. It is widely used in heavy industrial fields such as wind power generation, aerospace, shipbuilding, lifting machinery, metallurgy and mining. The planetary gearbox is equipped with multiple planetary gears, a sun gear and an inner ring gear. Usually, the ring gear is stationary, the sun gear rotates around its central axis, and the planetary gears rotate around their respective central axes and revolve around the central axis of the sun gear at the same time, with the sun gear shaft or planet carrier as input. Since the planetary gear revolves around the central axis of the sun gear, the position of the planetary gear in the gear train and the position of the gear meshing point will change periodically, the planetary gear is prone to vibration, and the vibration energy cannot be fully utilized. Summary of the invention

[0004] The object of the present invention is to provide a planetary gear monitoring device to solve the technical problems in the prior art that gearbox fault monitoring is difficult and vibration energy cannot be fully utilized.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A planetary gear monitoring device is used for a gear box, the gear box comprises a housing, a planet carrier and a planetary gear arranged in the housing, the planetary gear is rotatably connected to the planet carrier, and the planetary gear monitoring device comprises:

[0007] A power generation component, comprising a piezoelectric power generation sheet, wherein the piezoelectric power generation sheet is arranged on the planetary gear and / or the planetary carrier, and the piezoelectric power generation sheet generates electric energy under the vibration of the planetary gear and / or the planetary carrier;

[0008] The monitoring component comprises a circuit board and a plurality of sensors, wherein the sensors are electrically connected to the circuit board, the power generation component provides electrical energy to the circuit board, and the plurality of sensors comprise a displacement sensor, a vibration sensor and a temperature sensor.

[0009] Preferably, the power generation component also includes a coil and a magnet, one of the coil and the magnet is arranged on the planetary wheel, and the other is arranged on the planetary carrier, and during the rotation of the planetary wheel relative to the planetary carrier, the coil and the magnet have relative movement to generate electrical energy, and the coil is electrically connected to the circuit board.

[0010] Preferably, the piezoelectric generator, the coil, the circuit board and the sensor are all arranged on the planetary gear;

[0011] Alternatively, the piezoelectric power generating sheet, the coil, the circuit board and the sensor are all arranged on the planet carrier.

[0012] Preferably, a receiving cavity is provided on the planetary wheel, and the piezoelectric generator, the coil, the circuit board and at least part of the sensor are all located in the receiving cavity, and the receiving cavity extends parallel to the axial direction of the planetary wheel.

[0013] Preferably, a receiving groove is provided on the planet carrier ring, the magnet is arranged in the receiving groove, and the receiving cavity is arranged opposite to the receiving groove.

[0014] Preferably, a receiving hole communicating with the receiving cavity is provided in the planetary wheel, at least part of the sensor is located in the receiving hole, and the receiving hole extends parallel to the radial direction of the planetary wheel.

[0015] Preferably, one of the accommodating holes is a first accommodating hole, one end of the first accommodating hole is connected to the accommodating cavity, the other end of the first accommodating hole extends to the root of the planetary gear, and the sensor arranged in the first accommodating hole is a strain sensor.

[0016] Preferably, the gearbox is connected to a motor, and the motor is disposed outside the box. The coil cuts electromagnetic waves emitted by the motor to the surrounding space to generate electrical energy during synchronous rotation with the planetary gear or the planetary carrier.

[0017] Preferably, the gearbox further comprises a pin shaft and a bearing, and the bearing and the planetary gear are both sleeved on the pin shaft;

[0018] The power generation component also includes a thermoelectric power generation sheet, which is electrically connected to the circuit board, with a hot end of the thermoelectric power generation sheet facing the bearing or the planetary gear, and a cold end of the thermoelectric power generation sheet away from the bearing or the planetary gear.

[0019] Preferably, it also includes a battery, which is electrically connected to the circuit board and can store electrical energy provided by the power generation component.

[0020] Beneficial effects of the present invention:

[0021] The planetary gear monitoring device proposed in the present invention has a piezoelectric generator arranged on the planetary gear and / or the planetary carrier. Under the vibration of the planetary gear and / or the planetary carrier, the piezoelectric generator generates electrical energy and provides electrical energy to the circuit board, so that the vibration energy is fully utilized; multiple sensors can monitor the displacement information, vibration information and temperature information of the planetary gear, which is convenient for timely handling of faults; through the cooperation of the piezoelectric generator and the sensor, not only can the vibration energy be fully utilized, but also the information of the planetary gear can be monitored, thereby reducing the failure rate, eliminating the need to set up batteries, and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a planetary gear monitoring device provided in Embodiment 1 of the present invention;

[0023] Figure 2 is a partial structural schematic diagram of a planetary gear monitoring device provided in Embodiment 1 of the present invention;

[0024] Figure 3 is a schematic diagram of a planetary gear monitoring device provided in Embodiment 2 of the present invention;

[0025] Figure 4 yes Figure 3 A magnified image of point A;

[0026] Figure 5 is a schematic diagram of a planetary gear monitoring device provided in Embodiment 3 of the present invention;

[0027] Figure 6 yes Figure 5 Enlarged view of point B.

[0028] In the figure:

[0029] 110, planet carrier; 120, planet gear; 121, accommodating chamber; 130, pin shaft; 140, thrust bearing; 150, radial bearing;

[0030] 11. Piezoelectric power generation sheet; 12. Coil; 13. Magnet; 14. Temperature difference power generation sheet;

[0031] 21. Circuit board; 221. Vibration sensor; 222. Temperature sensor; 223. Radial displacement sensor; 224. Axial displacement sensor; 225. Strain sensor. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] Embodiment 1

[0037] See also Figure 1 and Figure 2 The embodiment of the present invention provides a planetary gear monitoring device for a gearbox, wherein the gearbox includes a housing, a planet carrier 110 and a planetary gear 120 disposed in the housing, wherein the planetary gear 120 is rotatably connected to the planet carrier 110. The gearbox also includes a pin 130 and a bearing, wherein the bearing and the planetary gear 120 are both sleeved on the pin 130; the bearing is divided into a thrust bearing 140 and a radial bearing 150, wherein the thrust bearing 140 is disposed between the planetary gear 120 and the planet carrier 110, and the radial bearing 150 is disposed between the planetary gear 120 and the pin 130.

[0038] The planetary gear monitoring device is used to monitor the relevant information of the planetary gear, which usually includes displacement information, vibration information and temperature information. The planetary gear monitoring device includes a power generation component and a monitoring component. The power generation component includes a piezoelectric power generation sheet 11, which is arranged on the planetary gear 120 and / or the planetary carrier 110. The piezoelectric power generation sheet 11 generates electric energy under the vibration of the planetary gear 120 and / or the planetary carrier 110; the monitoring component includes a circuit board 21 and a plurality of sensors, the sensors are electrically connected to the circuit board 21, the power generation component provides electric energy to the circuit board 21, and the plurality of sensors include a displacement sensor, a vibration sensor 221 and a temperature sensor 222.

[0039] The piezoelectric power generating sheet 11 is arranged on the planetary gear 120 and / or the planetary carrier 110. Under the vibration of the planetary gear 120 and / or the planetary carrier 110, the piezoelectric power generating sheet 11 generates electric energy and provides electric energy to the circuit board 21, so that the vibration energy is fully utilized; multiple sensors can monitor the displacement information, vibration information and temperature information of the planetary gear, which is convenient for timely handling of faults; through the cooperation of the piezoelectric power generating sheet 11 and the sensor, not only the vibration energy is fully utilized, but also the information of the planetary gear can be monitored, thereby reducing the failure rate, eliminating the need to set up batteries, and saving energy.

[0040] The piezoelectric generator 11 is an existing generator, specifically a piezoelectric ceramic. Piezoelectric ceramics have sensitive characteristics and can convert extremely weak mechanical vibrations into electrical signals. Because the internal structure of piezoelectric ceramics has both positive and negative charges, when subjected to pressure or vibration, the distribution of positive and negative charges inside will change, thereby generating a potential difference and current, forming electrical energy output.

[0041] In this embodiment, the piezoelectric generator 11 is disposed on the planetary gear 120, the corresponding circuit board 21 is disposed on the planetary gear 120, and the sensor is disposed on the planetary gear 120, so as to facilitate the electrical connection between the piezoelectric generator 11 and the circuit board 21, and facilitate the electrical connection between the sensor and the circuit board 21. Specifically, the piezoelectric generator 11 can be disposed on the end surface of the planetary gear 120. There is no limit to the number of piezoelectric generators 11, which can be set according to actual needs.

[0042] The planetary wheel 120 is provided with a receiving cavity 121, in which the piezoelectric generator 11, the circuit board 21 and at least part of the sensor are all located. The receiving cavity 121 extends parallel to the axial direction of the planetary wheel 120. The internal space of the planetary wheel 120 is fully utilized to ensure that the exterior of the planetary wheel 120 is neat and tidy and to avoid interference between components.

[0043] The planetary gear 120 is provided with a receiving hole connected to the receiving cavity 121, at least part of the sensor is located in the receiving hole, and the receiving hole is parallel to the radial extension of the planetary gear 120. The displacement sensor includes a radial displacement sensor 223 and an axial displacement sensor 224, the axial displacement sensor 224 is arranged in the receiving cavity 121, and the radial displacement sensor 223 is arranged in the receiving hole. There can be multiple displacement sensors to calculate the axis trajectory or the oil film thickness of the sliding bearing.

[0044] The vibration sensor 221 and the temperature sensor 222 can be arranged in the accommodating cavity 121, or in the accommodating hole, or in both the accommodating cavity 121 and the accommodating hole. The vibration sensor 221 is used to monitor the vibration signal of the planetary gear 120, and then analyze the damage of the planetary gear 120. The temperature sensor 222 is used to monitor the temperature of the radial bearing 150, and then analyze whether there is any damage abnormality.

[0045] One of the accommodating holes is a first accommodating hole, one end of which is connected to the accommodating cavity 121, and the other end of which extends to the root of the planetary gear 120. The sensor disposed in the first accommodating hole is a strain sensor 225. The strain sensor 225 is used to monitor the tooth root stress signal of the planetary gear 120, thereby analyzing the fatigue condition of the planetary gear 120 and predicting the life of the planetary gear 120. A vibration sensor may also be disposed in the first accommodating hole to detect the vibration signal of the planetary gear 120.

[0046] One of the accommodating holes is a second accommodating hole, one end of the second accommodating hole is connected to the accommodating cavity 121 , and the other end of the second accommodating hole extends to the inner hole of the planetary gear 120 . The sensor disposed in the second accommodating hole is a temperature sensor 222 .

[0047] The vibration sensor 221 is connected to the circuit board 21 through a vibration collection circuit, and the temperature sensor 222 is connected to the circuit board 21 through a temperature collection circuit. The vibration sensor 221 and the temperature sensor 222 are both existing sensors, which are used to monitor the vibration information and temperature information of the planetary gear 120 and transmit them to the controller. The controller can determine whether the gear box is abnormal based on this information. The controller can be wirelessly connected to the sensor or the circuit board 21, so the controller can be set outside the box. The controller can be powered by a battery or a wired power supply. The wireless connection can be existing technologies such as wifi and Bluetooth, which will not be repeated here.

[0048] The axial displacement sensor 224 and the radial displacement sensor 223 are both existing sensors, and their principles are not described here. The axial displacement sensor 224 can obtain the minimum axial thickness of the oil film by monitoring the axial movement of the planetary gear 120, and analyze whether the thrust bearing 140 is damaged. The radial displacement sensor 223 obtains the minimum oil film thickness and the oil film change by monitoring the radial clearance between the planetary gear 120 and the pin 130, and then analyzes whether the radial bearing 150 is damaged. The radial displacement sensor 223 can be arranged at 90 degrees to obtain the axis trajectory.

[0049] The multiple sensors may also include a pressure sensor for measuring the oil film pressure and analyzing the operating status. The multiple sensors may also include an acoustic emission sensor for monitoring the crack propagation of parts.

[0050] The power generation assembly also includes a coil 12 and a magnet 13, one of which is disposed on the planetary gear 120 and the other on the planetary carrier 110. When the planetary gear 120 rotates relative to the planetary carrier 110, the coil 12 and the magnet 13 move relative to each other to generate electric energy, and the coil 12 is electrically connected to the circuit board 21. The coil 12 generates electric energy by cutting the magnetic flux lines, so that the relative movement between the planetary gear 120 and the planetary carrier 110 is fully utilized, and the electric energy can be supplied to the circuit board 21.

[0051] In this embodiment, the coil 12 is disposed on the planetary gear 120, and the coil 12 and the piezoelectric generator 11 can share a circuit board 21, so the magnet 13 is disposed on the planetary carrier 110. Specifically, the piezoelectric generator 11, the coil 12, the circuit board 21 and the sensor are all disposed on the planetary gear 120.

[0052] The piezoelectric generator 11, the coil 12, the circuit board 21 and some sensors are located in the accommodating cavity 121, which extends parallel to the axial direction of the planetary gear 120. Some sensors are located in the accommodating hole, which is connected to the accommodating cavity 121 and extends parallel to the radial direction of the planetary gear 120. The internal space of the planetary gear 120 is fully utilized to ensure that the exterior of the planetary gear 120 is neat and tidy and to avoid interference between components.

[0053] The planet carrier 110 is provided with a receiving groove, the magnet 13 is arranged in the receiving groove, and the receiving cavity 121 is arranged opposite to the receiving groove. A plurality of magnets 13 are arranged at intervals along the circumference of the receiving groove.

[0054] The gearbox is connected to the motor, and the motor is arranged outside the box. The coil 12 cuts the electromagnetic waves emitted by the motor to the surrounding space to generate electric energy during the synchronous rotation with the planetary gear 120. Permanent magnet DC motors are commonly used in current motors. The so-called permanent magnet DC motor refers to a motor that generates torque and rotates by the interaction of the magnetic field generated by the permanent magnet and the energized coil of the outer rotor in the inner stator of the motor. When the motor rotates, there will inevitably be electromagnetic waves. The iron shell of the motor can shield most of the electromagnetic waves, but some electromagnetic waves still leak out, so the coil 12 can make full use of the electromagnetic waves. In addition, the motor can be a generator, such as a power generation device integrating a gearbox and a generator. In addition, the emission source of the electromagnetic wave can also be a transmitting circuit board.

[0055] The planetary gear monitoring device also includes a battery, which is electrically connected to the circuit board 21, and the battery can store the electric energy provided by the power generation component. By setting up the battery, the electric energy can be stored, and the battery can supply the circuit board 21 as needed. Even if the transmission shaft does not rotate, the sensor can obtain electric energy for detection.

[0056] Embodiment 2

[0057] Figure 3 and Figure 4 Embodiment 2 is shown, in which the components identical or corresponding to those of Embodiment 1 are marked with the corresponding reference numerals of Embodiment 1. For the sake of simplicity, only the differences between Embodiment 2 and Embodiment 1 are described. The difference is that the piezoelectric generator 11 is arranged on the planetary carrier 110, the corresponding circuit board 21 is arranged on the planetary carrier 110, and the sensor is arranged on the planetary carrier 110, so as to facilitate the electrical connection between the piezoelectric generator 11 and the circuit board 21, and to facilitate the electrical connection between the sensor and the circuit board 21. Specifically, the piezoelectric generator 11 can be arranged on the planetary carrier 110 near the circuit board 21. There is no restriction on the number of piezoelectric generators 11, which can be arranged according to actual needs.

[0058] Since the pin 130 is fixedly connected to the planet carrier 110, the sensor can be disposed on the pin 130. In other embodiments, the planetary gear 120 and the planet carrier 110 are both provided with a piezoelectric generator sheet 11, and correspondingly, the planetary gear 120 and the planet carrier 110 are both provided with a circuit board 21.

[0059] The power generation component further includes a coil 12 and a magnet 13 . The coil 12 is disposed on the planet carrier 110 . The coil 12 and the piezoelectric power generation sheet 11 can share a circuit board 21 . Therefore, the magnet 13 is disposed on the planet gear 120 .

[0060] Embodiment 3

[0061] Figure 5 and Figure 6 The third embodiment is shown, in which the components identical or corresponding to the first embodiment are marked with the corresponding reference numerals of the first embodiment. For the sake of simplicity, only the differences between the third embodiment and the first embodiment are described. The difference is that the power generation component further includes a thermoelectric power generation sheet 14, the thermoelectric power generation sheet 14 is electrically connected to the circuit board 21, the hot end of the thermoelectric power generation sheet 14 faces the bearing or the planetary gear 120, and the cold end of the thermoelectric power generation sheet 14 is away from the bearing or the planetary gear 120. The heat generated at the bearing or the planetary gear 120 is fully utilized, saving energy.

[0062] The thermoelectric power generation sheet 14 can be arranged on the planetary gear 120 or on the planetary carrier 110. When the thermoelectric power generation sheet 14 is arranged on the planetary gear 120, the thermoelectric power generation sheet 14 can share the circuit board 21 with the piezoelectric power generation sheet 11. When the thermoelectric power generation sheet 14 is arranged on the planetary carrier 110, a circuit board 21 can be arranged separately for the thermoelectric power generation sheet 14. When the thermoelectric power generation sheet 14 is arranged on the planetary carrier 110, the temperature difference between the planetary carrier 110 and the oil pool can be used to provide electrical energy.

[0063] The number of the thermoelectric power generation sheets 14 can be set according to actual needs. The thermoelectric power generation sheets 14 can be set in the receiving hole of the planetary gear 120, or can be set on the end surface of the planetary gear 120. Figure 6 As shown, one thermoelectric power generation sheet 14 is disposed in the receiving hole, and another thermoelectric power generation sheet 14 is disposed on the end surface of the planetary gear 120 .

[0064] The temperature difference power generation sheet 14 is an existing power generation sheet, a device that converts temperature difference into electrical energy. The working principle is to generate electromotive force through two different materials at different temperatures and generate electrical energy through circuit connection. Its principle will not be elaborated here.

[0065] The above-mentioned power generation components can be freely combined without contradiction. For example, the piezoelectric power generation sheet 11, coil 12, magnet 13 and thermoelectric power generation sheet 14 generate electricity at the same time, the thermoelectric power generation sheet 14 and piezoelectric power generation sheet 11 generate electricity at the same time, and the piezoelectric power generation sheet 11, coil 12 and magnet 13 generate electricity at the same time.

[0066] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A planetary gear monitoring device for a gear box, characterized in that: The gearbox comprises a housing, a planet carrier (110) and a planetary gear (120) arranged in the housing, wherein the planetary gear (120) is rotatably connected to the planet carrier (110), and the planetary gear monitoring device comprises: A power generation component, comprising a piezoelectric power generation sheet (11), wherein the piezoelectric power generation sheet (11) is arranged on the planetary gear (120) and / or the planetary carrier (110), and the piezoelectric power generation sheet (11) generates electric energy under the vibration of the planetary gear (120) and / or the planetary carrier (110); The monitoring component comprises a circuit board (21) and a plurality of sensors, wherein the sensors are electrically connected to the circuit board (21), the power generation component provides electrical energy to the circuit board (21), and the plurality of sensors comprise a displacement sensor, a vibration sensor (221) and a temperature sensor (222).

2. The planetary gear monitoring device according to claim 1, characterized in that: The power generation component further comprises a coil (12) and a magnet (13); one of the coil (12) and the magnet (13) is arranged on the planetary gear (120), and the other is arranged on the planetary carrier (110); when the planetary gear (120) rotates relative to the planetary carrier (110), the coil (12) and the magnet (13) move relative to each other to generate electrical energy; and the coil (12) is electrically connected to the circuit board (21).

3. The planetary gear monitoring device according to claim 2, characterized in that: The piezoelectric power generation sheet (11), the coil (12), the circuit board (21) and the sensor are all arranged on the planetary gear (120); Alternatively, the piezoelectric power generation sheet (11), the coil (12), the circuit board (21) and the sensor are all arranged on the planet carrier (110).

4. The planetary gear monitoring device according to claim 3, characterized in that: The planetary gear (120) is provided with a receiving cavity (121), the piezoelectric generator (11), the coil (12), the circuit board (21) and at least part of the sensor are all located in the receiving cavity (121), and the receiving cavity (121) extends parallel to the axial direction of the planetary gear (120).

5. The planetary gear monitoring device according to claim 4, characterized in that: The planet carrier (110) is provided with a receiving groove in an annular shape, the magnet (13) is arranged in the receiving groove, and the receiving cavity (121) is arranged opposite to the receiving groove.

6. The planetary gear monitoring device according to claim 4, characterized in that: The planetary wheel (120) is provided with a receiving hole in communication with the receiving cavity (121); at least part of the sensor is located in the receiving hole; the receiving hole extends parallel to the radial direction of the planetary wheel (120).

7. The planetary gear monitoring device according to claim 6, characterized in that: One of the accommodating holes is a first accommodating hole, one end of the first accommodating hole is connected to the accommodating cavity (121), the other end of the first accommodating hole extends to the root of the planetary gear (120), and the sensor arranged in the first accommodating hole is a strain sensor (225).

8. The planetary gear monitoring device according to claim 2, characterized in that: The gear box is connected to a motor, and the motor is arranged outside the box. The coil (12) cuts electromagnetic waves emitted by the motor to the surrounding space to generate electric energy during the process of synchronous rotation with the planetary gear (120) or the planetary carrier (110).

9. The planetary gear monitoring device according to claim 1, characterized in that: The gearbox further comprises a pin shaft (130) and a bearing, wherein the bearing and the planetary gear (120) are both sleeved on the pin shaft (130); The power generation component further comprises a temperature difference power generation sheet (14), wherein the temperature difference power generation sheet (14) is electrically connected to the circuit board (21), a hot end of the temperature difference power generation sheet (14) faces the bearing or the planetary gear (120), and a cold end of the temperature difference power generation sheet (14) is away from the bearing or the planetary gear (120).

10. The planetary gear monitoring device according to any one of claims 1 to 9, characterized in that: It also includes a storage battery, which is electrically connected to the circuit board (21) and can store the electric energy provided by the power generation component.

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