Self-powered angle monitoring sensor device for a slewing mechanism

Abstract

This invention belongs to the field of triboelectric nanogenerators, specifically relating to a self-powered angle monitoring and sensing device for a rotary mechanism. The technical solution of this invention is as follows: A self-powered angle monitoring and sensing device for a rotary mechanism includes a housing, a TENG angle monitoring unit, a TENG limit monitoring unit, and a gear transmission system. The TENG angle monitoring unit and the TENG limit monitoring unit are disposed within the housing. The mechanical energy of the rotary mechanism is transmitted to the TENG angle monitoring unit and the TENG limit monitoring unit through the gear transmission system. The self-powered angle monitoring and sensing device for a rotary mechanism provided by this invention can realize real-time angle monitoring of the rotary motion of engineering machinery, and perform mechanical limit start / stop operations, providing warnings when a dangerous working condition is imminent.

Description

Technical Field

[0001] This invention belongs to the field of triboelectric nanogenerators, specifically relating to a self-powered angle monitoring sensing device for a rotary mechanism. Background Technology

[0002] The slewing mechanism is the core actuator for achieving planar rotation in construction machinery, and its angle monitoring and limit protection are key aspects of operational safety. A special inspection of construction lifting machinery revealed that a large number of in-use construction lifting machinery have malfunctioning slewing limit switches, posing significant safety hazards. Taking tower cranes as an example, exceeding the slewing limit can easily lead to accidents such as equipment overturning and cable entanglement / short circuits, seriously threatening personnel and property safety. Traditional monitoring solutions require external power supply, resulting in complex wiring, susceptibility to interference from the construction site environment, unstable power supply to the slewing components of tower cranes, and difficulties in maintenance, making stable real-time monitoring difficult. Therefore, improving the monitoring and early warning capabilities of construction machinery and reducing the risk of equipment accidents has become a core task in the safety management of construction machinery. Summary of the Invention

[0003] This invention provides a self-powered angle monitoring sensor for a slewing mechanism, which can realize real-time angle monitoring of the slewing motion of engineering machinery, and perform mechanical limit start and stop on it, and can provide warning when it is about to be in a dangerous working condition.

[0004] The technical solution of the present invention is as follows: A self-powered angle monitoring sensor for a rotary mechanism includes a housing, a TENG angle monitoring unit, a TENG limit monitoring unit, and a gear transmission system. The TENG angle monitoring unit and the TENG limit monitoring unit are disposed in the housing, and the mechanical energy of the rotary mechanism is transmitted to the TENG angle monitoring unit and the TENG limit monitoring unit through the gear transmission system.

[0005] Furthermore, the self-powered angle monitoring sensor for the rotary mechanism, the TENG angle monitoring unit includes a rotating shaft, a hollow sleeve, an annular bracket, an inner pawl, an inner ratchet, an outer pawl, an outer ratchet, a power generation mechanism one, and a power generation mechanism two. Power generation mechanism one includes a stator one and a rotor one, and power generation mechanism two includes a stator two and a rotor two. The sidewalls of the housing are sequentially fixed with support plates one, two, and three from top to bottom. The upper and lower ends of the rotating shaft are rotatably connected to support plates one and three, respectively. The hollow sleeve is rotatably fitted onto the rotating shaft, with its upper end rotatably connected to support plate one. Stator one is fixedly connected to support plate one. Rotor 1 is fixedly connected to the hollow sleeve and corresponds to the position of stator 1; stator 2 is fixedly connected to support plate 2, the outer edge of rotor 2 is fixedly connected to the upper end of the annular bracket, and the inner edge of rotor 2 is rotatably connected to the hollow sleeve, with rotor 2 corresponding to the position of stator 2; a horizontal bracket 1 is provided at the lower end of the hollow sleeve, an inner pawl is installed at the end of the horizontal bracket 1, and an inner ratchet is fixedly fitted on the rotating shaft, with the inner pawl and the inner ratchet meshing together; a horizontal bracket 2 is provided at the lower end of the annular bracket, an outer pawl is installed at the end of the horizontal bracket 2, and an outer ratchet is fixedly installed at the lower part of the rotating shaft, with the outer pawl and the outer ratchet meshing together; the inner and outer ratchets face opposite directions.

[0006] Furthermore, in the self-powered angle monitoring sensor for the rotary mechanism, the lower end face of stator one is provided with copper electrode one, the lower end face of stator two is provided with copper electrode two, the upper end face of rotor one is provided with PTFE film one, and the upper end face of rotor two is provided with PTFE film two. Copper electrode one, copper electrode two, PTFE film one and PTFE film two are all uniformly distributed in a radial grid pattern, and wiring is arranged at copper electrode one and copper electrode two to lead to the outside.

[0007] Furthermore, in the self-powered angle monitoring sensor for the rotary mechanism, the number of copper electrodes one is twice the number of PTFE film one, the number of copper electrodes two is twice the number of PTFE film two, the dimensions of copper electrodes one and PTFE film one are matched, and the dimensions of copper electrodes two and PTFE film two are matched.

[0008] Furthermore, the self-powered angle monitoring sensor for the rotary mechanism is constrained by torsion springs and rubber bands between the inner pawl and the first horizontal support and between the outer pawl and the second horizontal support.

[0009] Furthermore, the self-powered angle monitoring sensor for the rotary mechanism, the TENG limit monitoring unit, includes a limit turntable, a central shaft, a stop rod, and a stop block. The limit turntable is fixedly mounted on the bottom wall of the housing, and the central shaft is fixedly mounted at the center of the limit turntable. The outer edge of the limit turntable is provided with an annular vertical wall, which has a locking platform 1 and a locking platform 2. A copper electrode 3 is provided on the annular vertical wall in front of the locking platform 1, and a copper electrode 4 is provided on the annular vertical wall in front of the locking platform 2. One end of the stop rod is fixedly mounted on the central shaft, and one end of the stop block is rotatably fitted onto the central shaft. The other end of the stop block has an inner locking block and an outer locking block. The inner locking block is used to block the other end of the stop rod, and the outer locking block is used to lock the locking platform 1 and the locking platform 2. A PTFE film 3 is provided on the front end face of the outer locking block, and the size of the PTFE film 3 corresponds to that of the copper electrode 3 and the copper electrode 4.

[0010] Furthermore, the self-powered angle monitoring sensor for the rotary mechanism includes a gear transmission system comprising a drive shaft, a constant-ratio bevel gear set, a worm gear set, and a speed-ratio bevel gear set. The constant-ratio bevel gear set includes a pair of straight bevel gears, the worm gear set includes a worm wheel and a worm, and the speed-ratio bevel gear set includes a driving bevel gear and a driven bevel gear. The drive shaft is rotatably connected to the bottom wall of the housing. The large rotary gear of the rotary mechanism is fixedly installed at the lower end of the drive shaft, and a straight bevel gear is fixedly installed at the upper end of the drive shaft. Support plate four and support plate five are provided on the rear wall of the outer casing. Support plate four and support plate five are set at the same height as the bottom wall of the outer casing. The two ends of the worm are rotatably connected to support plate four and support plate five respectively. Another straight bevel gear is fixedly installed on one end of the worm, and the driving bevel gear is fixedly installed on the other end of the worm. The two straight bevel gears mesh together. The worm wheel is fixedly installed on the end of the central shaft and meshes with the worm. The driven bevel gear is fixedly installed on the lower end of the rotating shaft, and the driving bevel gear meshes with the driven bevel gear.

[0011] Furthermore, the self-powered angle monitoring sensor for the rotary mechanism has the following configuration: the large rotary gear has 130 teeth and a module of 8; the spur bevel gear has 20 teeth and a module of 1; the worm has 1 thread; the worm wheel has 20 teeth and a module of 1; the driving bevel gear has 60 teeth and a module of 1; and the driven bevel gear has 15 teeth and a module of 1.

[0012] The working principle of the self-powered angle monitoring sensor used in the rotary mechanism is as follows: When the slewing mechanism rotates clockwise, the large slewing gear rotates clockwise, driving the constant speed ratio bevel gear set to move. Part of the power is transmitted to the TENG angle monitoring unit through the speed-increasing bevel gear set. The inner ratchet drives the inner pawl to rotate counterclockwise, and the outer ratchet and outer pawl bounce during the idle stroke. Through the friction generation between the copper electrode of stator 1 and the PTFE film of rotor 1, mechanical energy is converted into electrical energy to realize the monitoring of the reverse angle. The other part of the power is decelerated by the worm gear set and the mechanical energy is transmitted to the TENG limit monitoring unit. The stop lever rotates +360° from the initial position, then hits the inner locking block of the stop block, and then the stop lever pushes the stop block to rotate +180° together until the outer locking block of the stop block hits the locking platform 1, reaching the right limit +540° limit slewing position, and transmitting a limit alarm signal.

[0013] When the slewing mechanism rotates counterclockwise, the large slewing gear rotates counterclockwise, driving the constant speed ratio bevel gear set to move. Part of the power is transmitted to the TENG angle monitoring unit through the speed-increasing bevel gear set. The outer ratchet drives the outer pawl to rotate clockwise, while the inner ratchet and inner pawl bounce during the idle stroke. Through the friction generation between the copper electrode two of stator two and the PTFE film two of rotor two, mechanical energy is converted into electrical energy, realizing the monitoring of the forward angle. The other part of the power is decelerated through the worm gear set, transmitting mechanical energy to the TENG limit monitoring unit. The stop lever pushes the stop block from the initial 0° position to the left limit -540° extreme slewing position, and transmits the limit alarm signal.

[0014] The beneficial effects of this invention are as follows: 1. This invention enables autonomous monitoring without external power supply, adapting to the complex rotational working conditions of construction machinery. Utilizing triboelectric nano-power generation technology, it directly collects the mechanical energy of rotational motion and converts it into sensing electrical energy, eliminating the need for external cables and battery power supply in traditional sensors. This avoids the risks of wire entanglement, wear, and short circuits during rotational motion, reducing maintenance costs associated with wiring and battery replacement. It also offers stronger resistance to construction site dust and vibration interference, and can stably complete real-time acquisition of angles across the entire stroke from -540° to +540° over long periods.

[0015] 2. This invention integrates angle monitoring and mechanical limit warning functions, providing outstanding safety protection. It employs a bidirectional ratchet structure to distinguish between forward and reverse rotation of the equipment, achieving a minimum monitoring resolution of 0.45°, and ensuring controllable measurement error. Attached Figure Description

[0016] Figure 1 A schematic diagram of a self-powered angle monitoring sensor used in a rotary mechanism; Figure 2 Schematic diagram of TENG angle monitoring unit; Figure 3 A schematic diagram of the blasting of the TENG angle monitoring unit; Figure 4 Schematic diagram of TENG limit monitoring unit; Figure 5 This is a schematic diagram of the limit turntable; Figure 6 This is a schematic diagram of the stop lever; Figure 7 This is a schematic diagram of the stop block; Figure 8 This is a schematic diagram of the assembly of the worm gear assembly and the TENG limit monitoring unit. Detailed Implementation

[0017] like Figure 1-8 As shown, a self-powered angle monitoring sensor for the slewing mechanism of a tower crane includes a housing 1, a TENG angle monitoring unit, a TENG limit monitoring unit, and a gear transmission system. The TENG angle monitoring unit and the TENG limit monitoring unit are housed in the housing 1, and the mechanical energy of the slewing mechanism is transmitted to the TENG angle monitoring unit and the TENG limit monitoring unit through the gear transmission system.

[0018] The TENG angle monitoring unit includes a rotating shaft 2, a hollow sleeve, an annular bracket 5, an inner pawl 18, an inner ratchet 3, an outer pawl 19, an outer ratchet 4, a power generation mechanism one, and a power generation mechanism two. Power generation mechanism one includes a stator one 17 and a rotor one 6, and power generation mechanism two includes a stator two 7 and a rotor two 8. The sidewalls of the outer casing 1 are sequentially fixed with support plates one, two, and three from top to bottom. The upper and lower ends of the rotating shaft 2 are rotatably connected to support plates one and three, respectively. The hollow sleeve is rotatably fitted onto the rotating shaft 2, with its upper end rotatably connected to support plate one. Stator one 17 is fixedly connected to support plate one, and rotor one 6 is fixedly connected to the hollow sleeve and to the stator. Positions 1 and 17 correspond; Stator 2 7 is fixedly connected to support plate 2, the outer edge of rotor 2 8 is fixedly connected to the upper end of annular bracket 5, and the inner edge of rotor 2 8 is rotatably connected to hollow sleeve. Rotor 2 8 and stator 2 7 correspond in position; A horizontal support 1 is provided at the lower end of hollow sleeve, an inner pawl 18 is installed at the end of horizontal support 1, and an inner ratchet 3 is fixedly fitted on the rotating shaft 2, with the inner pawl 18 and inner ratchet 3 meshing together; A horizontal support 2 is provided at the lower end of annular bracket 5, an outer pawl 19 is installed at the end of horizontal support 2, and an outer ratchet 4 is fixedly installed at the lower part of the rotating shaft 2, with the outer pawl 19 and outer ratchet 4 meshing together; the inner ratchet 3 and outer ratchet 4 face opposite directions. Torsion springs and rubber bands are provided between the inner pawl 18 and horizontal support 1, and between the outer pawl 19 and horizontal support 2 for constraint.

[0019] The lower end face of stator 17 is provided with copper electrode 1, the lower end face of stator 27 is provided with copper electrode 2, the upper end face of rotor 16 is provided with PTFE film 1, and the upper end face of rotor 28 is provided with PTFE film 2. Copper electrode 1, copper electrode 2, PTFE film 1, and PTFE film 2 are all uniformly distributed in a radial grid pattern. Wires are arranged at copper electrode 1 and copper electrode 2 to lead to the outside, avoiding wire entanglement caused by wiring on the rotating parts. There are 20 pairs of copper electrode 1, 20 pairs of PTFE film 1, 20 pairs of copper electrode 2, and 20 pairs of PTFE film 2. The dimensions of copper electrode 1 and PTFE film 1 are matched, and the dimensions of copper electrode 2 and PTFE film 2 are matched, so that the PTFE film can form a stable triboelectric charging and electrostatic induction process with the copper electrode when it moves. In this configuration, the copper electrodes are fan-shaped, with each copper electrode forming an angle of 6° relative to the center, and the included angle between two adjacent copper electrodes is 3°; the rotating shaft 2 outputs an identifiable electrical signal every 18° of rotation; after conversion by the transmission ratio, when the tower crane rotates 0.45°, the device can output an electrical signal, thereby realizing real-time monitoring of the tower crane's rotation angle.

[0020] The TENG limit monitoring unit includes a limit turntable 20, a central shaft, a stop bar 21, and a stop block 22. The limit turntable 20 is fixedly installed on the bottom wall of the outer shell 1, and the central shaft is fixedly installed at the center of the limit turntable 20. The outer edge of the limit turntable 20 is provided with an annular vertical wall 23. The annular vertical wall 23 is provided with a first locking platform 24 and a second locking platform 25. A third copper electrode 26 is provided on the annular vertical wall 23 in front of the first locking platform 24, and a fourth copper electrode 27 is provided on the annular vertical wall 23 in front of the second locking platform 25. One end of the stop rod 21 is fixedly mounted on the central shaft, and one end of the stop block 22 is rotatably fitted onto the central shaft. The other end of the stop block 22 is provided with an inner locking block 28 and an outer locking block 29. The inner locking block 28 is used to block the other end of the stop rod 21, and the outer locking block 29 is used to lock the first locking platform 24 and the second locking platform 25. A PTFE film 30 is provided on the front end surface of the outer locking block 29, and the dimensions of the PTFE film 30 correspond to those of the third copper electrode 26 and the fourth copper electrode 27. The length of the third copper electrode 26 and the fourth copper electrode 27 is 20 mm, and the width is 6 mm.

[0021] The gear transmission system includes a drive shaft 11, a constant speed ratio bevel gear set, a worm gear set, and a speed-ratio bevel gear set. The constant speed ratio bevel gear set includes a pair of straight bevel gears 12, the worm gear set includes a worm gear 14 and a worm 13, and the speed-ratio bevel gear set includes a driving bevel gear 15 and a driven bevel gear 16. The drive shaft 11 is rotatably connected to the bottom wall of the housing 1. The large rotary gear 10 of the rotary mechanism is fixedly installed at the lower end of the drive shaft 11, and a straight bevel gear 12 is fixedly installed at the upper end of the drive shaft 11. A support plate and a support plate are provided on the rear wall of the housing 1. Fifth, support plates four and five are set at the same height as the bottom wall of the outer casing 1. The two ends of the worm gear 13 are rotatably connected to support plates four and five respectively. Another straight bevel gear 12 is fixedly installed on one end of the worm gear 13, and the driving bevel gear 15 is fixedly installed on the other end of the worm gear 13. The two straight bevel gears 12 mesh together. The worm wheel 14 is fixedly installed on the end of the central shaft and meshes with the worm gear 13. The driven bevel gear 16 is fixedly installed on the lower end of the rotating shaft 2, and the driving bevel gear 15 meshes with the driven bevel gear 16. The large rotary gear 10 has 130 teeth and a module of 8; the straight bevel gear 12 has 20 teeth and a module of 1; the worm gear 13 has 1 start; the worm wheel 14 has 20 teeth and a module of 1; the driving bevel gear 15 has 60 teeth and a module of 1; and the driven bevel gear 16 has 15 teeth and a module of 1.

[0022] The work process is as follows: When the tower crane begins to rotate, its mechanical energy is introduced into the device through the large slewing gear 10. Subsequently, the gear transmission system divides this mechanical energy into two paths: one path is transmitted to the TENG angle monitoring unit via the constant speed ratio bevel gear set and the acceleration ratio bevel gear set, which can distinguish the tower crane's rotation direction through the output channel and waveform characteristics of the electrical signal, and calculate the tower crane's rotation angle by the number of signals; the other path is transmitted to the TENG limit monitoring unit via the worm gear set.

[0023] When the slewing mechanism rotates clockwise, the large slewing gear 10 rotates clockwise, driving the constant speed ratio bevel gear set to move. Part of the power is transmitted to the TENG angle monitoring unit through the speed-increasing bevel gear set. The inner ratchet 3 drives the inner pawl 18 to rotate counterclockwise, and the outer ratchet 4 and the outer pawl 19 bounce during the idle stroke. Through the friction between the copper electrode of the stator 17 and the PTFE film of the rotor 6, mechanical energy is converted into electrical energy to realize the monitoring of the reverse angle. The other part of the power is decelerated by the worm gear set and the mechanical energy is transmitted to the TENG limit monitoring unit. The stop lever 21 starts from the initial position and first rotates +360° on its own. Then it hits the inner locking block 28 of the stop block 22. Then the stop lever 21 pushes the stop block 22 to rotate +180° together. When the outer locking block 29 of the stop block 22 hits the locking platform 24, it reaches the right limit +540° limit slewing position and transmits the limit alarm signal.

[0024] When the slewing mechanism rotates counterclockwise, the large slewing gear 10 rotates counterclockwise, driving the constant speed ratio bevel gear set. Part of the power is transmitted to the TENG angle monitoring unit through the speed-increasing bevel gear set. The outer ratchet 4 drives the outer pawl 19 to rotate clockwise, while the inner ratchet 3 and inner pawl 18 bounce during their idle stroke. This generates electricity through friction between the copper electrode 2 of stator 2 and the PTFE film 2 of rotor 2, converting mechanical energy into electrical energy to monitor the forward angle. The other part of the power is decelerated by the worm gear set and transmitted to the TENG limit monitoring unit. The stop lever 21 pushes the stop block 22 from the initial 0° position to the left limit -540° extreme slewing position, transmitting a limit alarm signal. This limit signal can be used to indicate that the tower crane has reached the dangerous slewing range, and can also serve as an angle accumulation error calibration signal, improving the reliability of the device during long-term monitoring.

[0025] This self-powered angle monitoring sensor can monitor the full-stroke slewing angle of the tower crane from -540° to +540° without an external power supply. When the tower crane's slewing speed is 0.5 rpm, the TENG angle monitoring unit can continuously output a stable and periodic voltage signal, with an overall voltage of approximately 165 V; when the left and right limit positions are reached, the TENG limit monitoring unit can output warning signals respectively.

[0026] After building an angle monitoring and warning system using LabVIEW, the device can realize real-time angle display, speed display, operating status judgment, and limit warning, proving its feasibility for intelligent monitoring and safety early warning of tower crane slewing mechanisms. It automatically outputs a warning electrical signal when the slewing limit position is reached, and, in conjunction with the LabVIEW visualization system, displays the angle and speed in real time, proactively avoiding major safety hazards such as exceeding the slewing limit angle and cable entanglement, thus improving the level of intelligent safety management of construction machinery.

Claims

1. A self-powered angle monitoring sensor for a rotary mechanism, characterized in that, It includes a housing, a TENG angle monitoring unit, a TENG limit monitoring unit, and a gear transmission system. The TENG angle monitoring unit and the TENG limit monitoring unit are housed in the housing. The mechanical energy of the rotary mechanism is transmitted to the TENG angle monitoring unit and the TENG limit monitoring unit through the gear transmission system.

2. The self-powered angle monitoring sensor for a rotary mechanism according to claim 1, characterized in that, The TENG angle monitoring unit includes a rotating shaft, a hollow sleeve, an annular bracket, an inner ratchet, an inner ratchet tooth, an outer ratchet, an outer ratchet tooth, a power generation mechanism one, and a power generation mechanism two. Power generation mechanism one includes a stator one and a rotor one, and power generation mechanism two includes a stator two and a rotor two. Support plates one, two, and three are fixedly mounted sequentially from top to bottom on the sidewalls of the housing. The upper and lower ends of the rotating shaft are rotatably connected to support plates one and three, respectively. The hollow sleeve is rotatably fitted onto the rotating shaft, with its upper end rotatably connected to support plate one. Stator one is fixedly connected to support plate one, and rotor one is fixedly connected to the hollow sleeve. The position corresponds to that of stator one; stator two is fixedly connected to support plate two, the outer edge of rotor two is fixedly connected to the upper end of the annular bracket, and the inner edge of rotor two is rotatably connected to the hollow sleeve. The position of rotor two corresponds to that of stator two; a horizontal support one is provided at the lower end of the hollow sleeve, an inner pawl is installed at the end of the horizontal support one, and an inner ratchet is fixedly fitted on the rotating shaft, with the inner pawl and the inner ratchet meshing together; a horizontal support two is provided at the lower end of the annular bracket, an outer pawl is installed at the end of the horizontal support two, and an outer ratchet is fixedly installed at the lower part of the rotating shaft, with the outer pawl and the outer ratchet meshing together; the inner ratchet and the outer ratchet face opposite directions.

3. The self-powered angle monitoring sensor for a rotary mechanism according to claim 2, characterized in that, The lower end face of stator one is provided with copper electrode one, the lower end face of stator two is provided with copper electrode two, the upper end face of rotor one is provided with PTFE film one, the upper end face of rotor two is provided with PTFE film two. Copper electrode one, copper electrode two, PTFE film one and PTFE film two are all uniformly distributed in a radial grid pattern. Lines are arranged at copper electrode one and copper electrode two to lead to the outside.

4. The self-powered angle monitoring sensor for a rotary mechanism according to claim 3, characterized in that, The number of copper electrodes one is twice the number of PTFE film one, and the number of copper electrodes two is twice the number of PTFE film two. The dimensions of copper electrodes one and PTFE film one are matched, and the dimensions of copper electrodes two and PTFE film two are matched.

5. The self-powered angle monitoring sensor for a rotary mechanism according to claim 2, characterized in that, A torsion spring and a rubber band are provided to constrain the inner pawl and the first horizontal support, and the outer pawl and the second horizontal support.

6. The self-powered angle monitoring sensor for a rotary mechanism according to claim 2, characterized in that, The TENG limit monitoring unit includes a limit turntable, a central shaft, a stop bar, and a stop block. The limit turntable is fixedly mounted on the bottom wall of the housing, and the central shaft is fixedly mounted at the center of the limit turntable. The outer edge of the limit turntable has an annular vertical wall, which has a locking platform 1 and a locking platform 2. A copper electrode 3 is mounted on the annular vertical wall in front of the locking platform 1, and a copper electrode 4 is mounted on the annular vertical wall in front of the locking platform 2. One end of the stop bar is fixedly mounted on the central shaft, and one end of the stop block is rotatably fitted onto the central shaft. The other end of the stop block has an inner locking block and an outer locking block. The inner locking block is used to block the other end of the stop bar, and the outer locking block is used to lock the locking platforms 1 and 2. A PTFE film 3 is provided on the front end face of the outer locking block, and the size of the PTFE film 3 corresponds to that of the copper electrode 3 and the copper electrode 4.

7. The self-powered angle monitoring sensor for a rotary mechanism according to claim 6, characterized in that, The gear transmission system includes a drive shaft, a constant speed ratio bevel gear set, a worm gear set, and a speed-ratio bevel gear set. The constant speed ratio bevel gear set includes a pair of straight bevel gears, the worm gear set includes a worm wheel and a worm, and the speed-ratio bevel gear set includes a driving bevel gear and a driven bevel gear. The drive shaft is rotatably connected to the bottom wall of the housing. The large rotating gear of the rotary mechanism is fixedly installed at the lower end of the drive shaft, and a straight bevel gear is fixedly installed at the upper end of the drive shaft. Support plates four and five are provided on the rear wall of the housing, and support plates four and five are set at the same height as the bottom wall of the housing. The two ends of the worm are rotatably connected to support plates four and five, respectively. Another straight bevel gear is fixedly installed at one end of the worm, and the driving bevel gear is fixedly installed at the other end of the worm. The two straight bevel gears mesh together. The worm wheel is fixedly installed at the end of the central shaft and meshes with the worm. The driven bevel gear is fixedly installed at the lower end of the rotating shaft, and the driving bevel gear meshes with the driven bevel gear.

8. The self-powered angle monitoring sensor for a rotary mechanism according to claim 7, characterized in that, The large rotary gear has 130 teeth and a module of 8; the spur bevel gear has 20 teeth and a module of 1; the worm has 1 thread and the worm wheel has 20 teeth and a module of 1; the driving bevel gear has 60 teeth and a module of 1, and the driven bevel gear has 15 teeth and a module of 1.

Images