A kind of online monitoring system of retrofitting variable pitch battery

Abstract

The present application relates to the technical field of variable pitch battery, especially to a variable pitch battery online monitoring system, which comprises a crack friction part, including extension friction plates, butt shafts, extrusion blocks and semicircular ring baffles, the extension friction plates are provided in plurality, the extension friction plates are respectively located between adjacent rolling elements on the bearing, and the upper and lower sides of the extension friction plates are respectively in contact with the inner ring and the outer ring of the bearing, the side of each extension friction plate is fixedly installed with a butt shaft, and the end of the butt shaft at two symmetrical positions is fixedly connected with an extrusion block. The extension friction plate is in contact with the inner ring and the outer ring of the bearing, when the contact friction force is greater than the elastic force of the torque spring, it indicates that the bearing has a crack or needs to be lubricated, and the air bag is inflated to a certain volume for a plurality of times in a certain period of time, which indicates that a crack occurs in the position of the bearing which cannot be directly observed.

Description

Technical Field

[0001] This invention relates to the field of pitch battery technology, and in particular to an online monitoring system for pitch batteries. Background Technology

[0002] Wind energy is a clean and pollution-free renewable energy source that is inexhaustible. People utilize wind turbines to convert the kinetic energy of wind into electrical energy, making rational use of wind power. Wind turbines are equipped with pitch batteries. During wind power generation, when wind speed changes, the pitch batteries adjust the angle of the turbine blades to optimize the conversion of wind power into electricity, including speed, frequency, and quality, ensuring that the power grid's demands are met. Furthermore, when the wind turbine is unstable or not operating, the pitch batteries can serve as a backup power source, providing necessary power to the grid or the turbine control system. At low wind speeds, the energy reserves provided by the pitch batteries allow the turbine to continue generating electricity, further improving power generation efficiency.

[0003] Application No. 202310359349.3 proposes a monitoring device, monitoring system and wind turbine generator set for monitoring pitch bearings. It uses multiple cameras to monitor each pitch bearing separately, further analyzes and confirms the crack condition of the pitch bearing, and determines whether it is necessary to report directly to the engineer to go to the generator set for repair and maintenance based on the size and depth of the crack.

[0004] However, the pitch monitoring device monitors the pitch bearing through a camera, which can only capture images of the outside of the pitch bearing and observe cracks located on the outside. The camera cannot capture images of the inner ring of the bearing. As the pitch bearing is used, the cracks on the inner ring of the bearing change from small cracks to large cracks. At this point, maintenance is not possible, and repair or replacement is the only option, which increases maintenance costs. Summary of the Invention

[0005] The purpose of this invention is to address the problem in the prior art that cracks in the inner ring of pitch bearings cannot be monitored, and to propose an online monitoring system for pitch batteries.

[0006] The technical solution of the present invention: an online monitoring system for a pitch battery, including a tower, a nacelle fixedly installed on the top of the tower, a plurality of annularly distributed wind blades rotatably connected to the curved surface of the nacelle, each wind blade including blades and a shaft, the shaft being rotatably connected to the nacelle via a bearing, a lubricating component and a second magnet being provided inside the nacelle, and the wind blades being electrically connected to a pitch battery;

[0007] A cracked friction component includes an extended friction plate, a mating shaft, an extrusion block, and a semi-circular ring baffle. Multiple extended friction plates are provided, each located between adjacent rolling elements on a bearing. The upper and lower sides of each extended friction plate contact the inner and outer rings of the bearing, respectively. A mating shaft is fixedly mounted on the side of each extended friction plate. Extrusion blocks are fixedly connected to the ends of two symmetrically positioned mating shafts. The extrusion blocks have an elliptical structure, and their curved surfaces contact two semi-circular ring baffles. Each mating shaft is meshed with the same annular connecting sleeve. An attraction element is provided between the two semi-circular ring baffles.

[0008] A multi-layer expansion component includes an air-filling plate, an air cylinder, an air bag, and fine holes. The air cylinder is fixedly installed on the side of the air-filling plate, and the end of the air cylinder is connected to the air bag through a pipe. Fine holes are formed on the air bag.

[0009] The semi-circular baffle is located between the gas filling plate and the second magnet. A contact switch is fixedly installed on the inner wall of the cabin. The contact switch is located on the extension line of the end of the fine hole. The outer wall of the semi-circular baffle is slidably connected to the cabin.

[0010] Optionally, the extended friction plate adopts a symmetrically arranged arc plate structure, the arc surface of the arc plate is the same as the arc of the outer ring and inner ring of the bearing, a support frame is provided at the rotating shaft of the fan blade, the docking shaft rotates at the support, the docking shaft is elastically connected to the support frame through a torque spring, and the bearing, extended friction plate and extrusion block rotate synchronously.

[0011] Optionally, an angle sensor is fixedly installed on the side of the support frame facing the extrusion block. Initially, the vertex of the major axis of the elliptical structure of the extrusion block contacts the semi-circular baffle. The two semi-circular baffles separate and form a circular structure.

[0012] Optionally, the attracting element includes an insert block, a receiving sleeve, and a first magnet. The outer wall of the insert block is slidably connected to the receiving sleeve, the first magnet is fixedly installed inside the receiving sleeve, the outer wall of the insert block is coated with a non-magnetic stainless steel layer, and the receiving sleeve and the insert block are respectively installed on two semi-circular baffles.

[0013] Optionally, when there is friction between the outer ring, inner ring and extended friction plate of the bearing, when the inner ring develops a crack, the extended friction plate experiences increased friction from the inner ring and rotates clockwise; when the outer ring develops a crack, the extended friction plate experiences increased friction from the outer ring and rotates counterclockwise.

[0014] Optionally, the inner wall of the cabin is provided with an expansion cavity for airbag inflation. The expansion cavity has a cylindrical structure with a cross-sectional diameter that is the same as the diameter of the airbag. The airbag inflates laterally within the expansion cavity.

[0015] Optionally, the air filling plate and the air cylinder are elastically connected to each other by a return spring, and the air cylinder inflates the air bag at a rate greater than the rate of air leakage through the fine holes on the air bag.

[0016] Optionally, the lubricating component includes a pressure plate, a piston, an injection tube, and an extension tube. The side of the pressure plate is fixedly connected to the piston via a round rod. The piston slides inside the injection tube. A lubricating oil reservoir is provided inside the engine compartment. The injection tube communicates with the lubricating oil reservoir. The end of the injection tube is fixedly connected to the extension tube. The semi-circular baffle is located between the second magnet and the pressure plate.

[0017] Optionally, the end outlet of the extension tube faces the bearing, the pressure plate and the injection tube are elastically connected by a helical spring, the outer wall of the fan blade is rotatably connected to a support sleeve, and both the pressure plate and the aeration plate are made of iron plate, cobalt plate or nickel plate.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] This invention extends the contact between the friction plate and the inner and outer rings of the bearing. When the contact friction force is greater than the elastic force of the torque spring, it indicates that the bearing has cracked or needs additional lubrication. The extended friction plate rotates due to friction when the blade pitches. At this time, the second magnet can attract the air filling plate, and after multiple pitch changes, the air cylinder inflates the air bag multiple times. The air bag expands to a certain volume multiple times within a certain period of time, which indicates that cracks have occurred in a location inside the bearing that cannot be directly seen.

[0020] Furthermore, after the extended friction plate rotates, the second magnet attracts the pressure plate and stretches the torque spring. After the fan blade changes pitch again, the pressure plate and piston reset lubricating oil is sprayed onto the bearing from the extended tube. As the fan blade changes pitch, the oil is completely coated onto the bearing, reducing friction and preventing misjudgment caused by increased friction due to poor lubrication. It also reduces friction in time to protect the bearing and extend its service life.

[0021] Furthermore, when the wind turbine blades are pitching under normal conditions, if a crack occurs in the inner ring, the extended friction plate rotates clockwise; if a crack occurs in the outer ring, the extended friction plate rotates counterclockwise. The clockwise or counterclockwise rotation of the extended friction plate indicates whether the bearing crack is located on the outer ring or the outer ring, thus notifying maintenance personnel of the bearing's damage location and enabling quick identification, repair, or replacement. Attached Figure Description

[0022] Figure 1A schematic diagram of the overall structure of one embodiment of the present invention is provided;

[0023] Figure 2 A schematic diagram of a cracked friction component according to an embodiment of the present invention is provided;

[0024] Figure 3 A cross-sectional schematic diagram of a bearing structure according to an embodiment of the present invention is provided;

[0025] Figure 4 Give Figure 3 Enlarged schematic diagram of the extended friction plate structure in part A;

[0026] Figure 5 A schematic diagram of an air cylinder structure according to an embodiment of the present invention is provided;

[0027] Figure 6 A schematic diagram of the separation of a semi-circular ring baffle structure according to an embodiment of the present invention is provided;

[0028] Figure 7 A schematic diagram of a combined semi-circular ring baffle structure according to an embodiment of the present invention is provided.

[0029] Figure 8 A schematic diagram of the left cross-sectional view of the docking shaft structure according to an embodiment of the present invention is provided;

[0030] Figure 9 A schematic diagram of the left sectional view of the cabin structure according to an embodiment of the present invention is provided.

[0031] Reference numerals: 1. Tower; 2. Nacelle; 3. Fan blade; 4. Bearing; 5. Cracked friction component; 51. Extended friction plate; 52. Docking shaft; 53. Annular connecting sleeve; 54. Extrusion block; 55. Semi-circular baffle; 56. Insertion block; 57. Receiving sleeve; 58. First magnet; 59. Torque spring; 510. Angle sensor; 6. Lubricating component; 61. Support sleeve; 62. Pressure plate; 63. Piston; 64. Injection tube; 65. Helical spring; 66. Extension tube; 7. Multi-layer expansion component; 71. Gas filling plate; 72. Air cylinder; 73. Airbag; 74. Fine orifice; 75. Contact switch; 76. Return spring; 8. Second magnet. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0034] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1

[0038] This embodiment proposes an online monitoring system for adding a pitch battery, such as... Figure 1 As shown, the system includes a tower 1, with a nacelle 2 fixedly mounted on top of the tower 1. Multiple annular, equally angled fan blades 3 are rotatably connected to the curved surface of the nacelle 2. Each fan blade 3 includes blades and a shaft, which is rotatably connected to the nacelle 2 via bearings 4. Figure 2 and Figure 9 As shown, the interior of the cabin 2 is equipped with a lubricating component 6 and a second magnet 8, and the fan blade 3 is electrically connected to a pitch battery.

[0039] In this embodiment, the wind blows the blades 3, causing the nacelle 2 to rotate, thus generating electricity from the wind turbine. When wind force and direction change, the pitch battery supplies power to the pitch motor, which drives the shaft of the blades 3 to rotate, thereby changing the angle of the blades on the blades 3 and preventing generator overload when the wind force is too strong. Furthermore, when the wind speed is low, the energy reserves provided by the pitch battery allow the wind turbine to continue generating electricity.

[0040] like Figure 3 and 4As shown, the monitoring system also includes a crack friction element 5, which includes an extended friction plate 51, a mating shaft 52, a pressing block 54, and a semi-circular ring baffle 55. Multiple extended friction plates 51 are provided, and the multiple extended friction plates 51 are respectively located between adjacent rolling elements on the bearing 4. The upper and lower sides of the extended friction plates 51 are in contact with the inner and outer rings of the bearing 4, respectively. A mating shaft 52 is fixedly installed on the side of each extended friction plate 51. The ends of two symmetrically positioned mating shafts 52 are fixedly connected to pressing blocks 54. The pressing blocks 54 adopt an elliptical structure, and the curved surfaces of the two pressing blocks 54 are in contact with two semi-circular ring baffles 55, respectively.

[0041] like Figure 8 As shown, each docking shaft 52 is meshed with the same annular connecting sleeve 53, and an attraction element is provided between the two semi-circular baffles 55. When the friction between one of the extended friction plates 51 and the bearing 4 increases, the extended friction plate 51 will use the docking shaft 52 on its side to rotate all the docking shafts 52 through the annular connecting sleeve 53, thereby causing the extrusion block 54 to rotate.

[0042] like Figure 8 As shown, the attracting component includes an insert block 56, a receiving sleeve 57, and a first magnet 58. The outer wall of the insert block 56 is slidably connected to the receiving sleeve 57, and the first magnet 58 is fixedly installed inside the receiving sleeve 57. The outer wall of the insert block 56 is coated with a non-magnetic stainless steel layer. The receiving sleeve 57 and the insert block 56 are respectively installed on two semi-circular baffles 55. The insert block 56 and the receiving sleeve 57 cooperate to guide the semi-circular baffles 55, so that the two semi-circular baffles 55 can be stably connected together. The first magnet 58 attracts the insert block 56 with magnetic force. Initially, the two semi-circular baffles 55 are supported and separated by the apex of the long axis of the extrusion block 54. After the extrusion block 54 rotates, the two semi-circular baffles 55 merge together under the magnetic force of the first magnet 58, and the semi-circular baffles 55 are removed from between the second magnet 8 and the gas filling plate 71.

[0043] like Figure 6-8 As shown, the vertex of the major axis of the elliptical structure of the extrusion block 54 contacts the semi-circular baffle 55. The two semi-circular baffles 55 separate, forming a circular structure. When a crack appears in the bearing 4 or the amount of lubricating oil on it is insufficient, the friction between the extended friction plate 51 and the bearing 4 increases. The extended friction plate 51 rotates, causing the extrusion block 54 to rotate. Originally, the vertex of the major axis of the extrusion block 54 was in contact with the semi-circular baffle 55. After the extrusion block 54 rotates, a gap is created between the extrusion block 54 and the semi-circular baffle 55 to allow the semi-circular baffle 55 to displace. The suction element causes the two semi-circular baffles 55 to move towards each other.

[0044] like Figure 3As shown, a support frame is provided at the shaft of the fan blade 3. The docking shaft 52 rotates at the support frame and is elastically connected to the support frame via a torque spring 59. The bearing 4, the extended friction plate 51, and the compression block 54 rotate synchronously and compress the torque spring 59. This causes the extended friction plate 51 to always move against the inner and outer walls of the bearing 4. By increasing the contact friction, it can be determined whether the bearing 4 has cracked or needs additional lubricating oil.

[0045] like Figure 5 As shown, the monitoring system also includes a multi-layer expansion component 7, which includes an air filling plate 71, an air cylinder 72, an air bag 73, and a fine hole 74. The air cylinder 72 is fixedly installed on the side of the air filling plate 71, and the end of the air cylinder 72 is connected to the air bag 73 through a pipe. The fine hole 74 is opened on the air bag 73. A semi-circular baffle 55 is located between the air filling plate 71 and the second magnet 8. A contact switch 75 is fixedly installed on the inner wall of the cabin 2. The contact switch 75 is located on the extension line of the end of the fine hole 74. The outer wall of the semi-circular baffle 55 is slidably connected to the cabin 2. The air filling plate 71 compresses the air cylinder 72 to supply air to the fine hole 74. The air filling plate 71 is made of one of iron plate, cobalt plate, or nickel plate. The air filling plate 71 and the air cylinder 72 are elastically connected to each other by a return spring 76, which resets the air filling plate 71.

[0046] After the two semi-circular baffles 55 move towards each other, the semi-circular baffles 55 no longer block the air filling plate 71 and the second magnet 8. At this time, the second magnet 8 will attract the air filling plate 71, and the air filling plate 71 will stretch the return spring 76. As the fan blade 3 rotates or returns to its original position, the extended friction plate 51 moves away from the crack in the bearing 4. Under the elastic force of the torque spring 59, the extended friction plate 51 returns to its initial state. At this time, the squeezing block 54 pushes the semi-circular baffle 55 up again, blocking the second magnet 8 and the air filling plate 71. The air filling plate 71 returns to its original position under the action of the return spring 76, and the air pump 72 completes one inflation of the air bag 73. Since the wind direction and wind force are variable, the fan blade 3 will change pitch multiple times on the same day. Therefore, the air pump 72 will inflate the air bag 73 multiple times, causing the air bag 73 to expand multiple times.

[0047] The inner wall of cabin 2 has an expansion cavity for the inflation of airbag 73. The expansion cavity has a cylindrical structure with a cross-sectional diameter the same as that of airbag 73. Airbag 73 inflates laterally within the expansion cavity. The expansion cavity restricts the inflation direction of airbag 73, ensuring that it always inflates towards the contact switch 75.

[0048] The inflation rate of the air pump 72 to the air bag 73 is greater than the leakage rate at the fine hole 74 on the air bag 73. After the air bag 73 is inflated, it will slowly leak air. If the air bag 73 expands multiple times within a certain period of time and squeezes the contact switch 75, it indicates that there must be a crack in the bearing 4.

[0049] In this embodiment, the extended friction plate 51 contacts the inner and outer rings of the bearing 4. When the contact friction force is greater than the elastic force of the torque spring 59, it indicates that the bearing 4 has cracks or needs additional lubrication. When the blade 3 changes pitch, the extended friction plate 51 rotates due to friction. The extrusion block 54 rotates synchronously, causing the two semi-circular baffles 55 to merge. At this time, the second magnet 8 attracts the air filling plate 71, and after multiple pitch changes, the air cylinder 72 inflates the air bag 73 multiple times. The air bag 73 expands to a certain volume multiple times within a certain period of time, which indicates that cracks have occurred on the bearing 4.

[0050] Example 2

[0051] Based on Example 1, this example proposes an online monitoring system for a pitch battery, such as... Figure 3 As shown, the lubricating component 6 includes a pressure plate 62, a piston 63, an injection tube 64, and an extension tube 66. The side of the pressure plate 62 is fixedly connected to the piston 63 via a round rod. The piston 63 slides inside the injection tube 64. A lubricating oil reservoir is provided inside the engine compartment 2. The injection tube 64 is connected to the lubricating oil reservoir. The end of the injection tube 64 is fixedly connected to the extension tube 66. A semi-circular baffle 55 is located between the second magnet 8 and the pressure plate 62.

[0052] The end outlet of the extension tube 66 faces the bearing 4. The pressure plate 62 and the injection tube 64 are elastically connected by a helical spring 65. The outer wall of the fan blade 3 is rotatably connected to a support sleeve 61. The pressure plate 62 is made of one of iron plate, cobalt plate or nickel plate.

[0053] After the friction between the extended friction plate 51 and the bearing 4 increases, the fan blade 3 pitches, causing the extended friction plate 51 and the extrusion block 54 to rotate. After the extrusion block 54 rotates, the two semi-circular ring baffles 55 merge under the action of the attraction element and move away from the second magnet 8 and the pressure plate 62. The second magnet 8 attracts the pressure plate 62 and stretches the helical spring 65. As the fan blade 3 pitches repeatedly, the extended friction plate 51 changes its contact position with the bearing 4 and resets under the action of the torque spring 59. At this time, the semi-circular ring baffle 55 is separated by the extrusion block 54 again. The semi-circular ring baffle 55 blocks the second magnet 8 and the pressure plate 62 again. The pressure plate 62 resets under the action of the helical spring 65. The pressure plate 62 reciprocates and drives the piston 63 to move. The piston 63 squeezes the lubricating oil in the lubricating oil tank and the injection tube 64 into the bearing 4. With the pitching of the fan blade 3, the lubricating oil is completely attached to the bearing 4, reducing the friction. After the lubricating oil is applied, the extended friction plate 51 rotates due to the increased friction, which indicates that the bearing 4 has cracks and needs to be repaired or replaced in time, thus proceeding to the steps of Example 1.

[0054] In this embodiment, when the fan blade 3 pitches, the extended friction plate 51 rotates due to the increased friction between it and the bearing 4, causing the semi-circular baffle 55 to move away from the second magnet 8 and the pressure plate 62. The second magnet 8 attracts the pressure plate 62 and stretches the torque spring 59. After the fan blade 3 pitches again, the torque spring 59 resets the pressure plate 62 and the piston 63, allowing lubricating oil to be sprayed onto the bearing 4 from the extended tube 66. As the fan blade 3 pitches, the oil is completely coated onto the bearing 4, reducing friction and preventing misjudgment caused by increased friction due to poor lubrication. This also reduces friction in time to protect the bearing 4 and extend its service life.

[0055] Example 3

[0056] Based on Embodiment 1 or 2 above, this embodiment proposes an online monitoring system for adding a pitch battery, such as... Figure 8 As shown, the extended friction plate 51 adopts a symmetrically arranged arc plate structure. The arc surface of the arc plate is the same as the arc of the outer ring and the inner ring of the bearing 4, respectively. The arc plate can always fit in contact with the outer ring and the inner ring of the bearing 4.

[0057] like Figure 6-8 As shown, an angle sensor 510 is fixedly installed on the side of the support frame facing the extrusion block 54. When the bearing 4 rotates, its outer ring and inner ring will move relative to each other. When there are no cracks and the outer ring and the outer ring surface are smooth, the friction between the outer ring, the inner ring and the extended friction plate 51 is small. The friction is less than the resistance of the torque spring 59, and the extended friction plate 51 will remain unchanged.

[0058] When friction exists between the outer and inner rings of bearing 4 and the extended friction plate 51, and the fan blade 3 is pitching under normal conditions, if a crack occurs in the inner ring, the extended friction plate 51 experiences increased friction from the inner ring, causing it to rotate clockwise; if a crack occurs in the outer ring, the extended friction plate 51 experiences increased friction from the outer ring, causing it to rotate counterclockwise. The angle sensor 510 detects the rotation direction of the extended friction plate 51 and the pressing block 54, and transmits this information to maintenance personnel via the controller, informing them of the location of the damage to bearing 4.

[0059] In this embodiment, when the fan blade 3 is pitching under normal conditions, if a crack occurs in the inner ring, the extended friction plate 51 experiences increased friction from the inner ring, causing it to rotate clockwise; if a crack occurs in the outer ring, the extended friction plate 51 experiences increased friction from the outer ring, causing it to rotate counterclockwise. The clockwise or counterclockwise rotation of the extended friction plate 51 indicates whether the crack in the bearing 4 is located on the outer ring, thus notifying maintenance personnel of the damaged location of the bearing 4, enabling them to quickly locate the damage for repair or replacement.

[0060] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An online monitoring system for a pitch battery, characterized in that, include: A tower (1) is fixedly mounted on the top of the tower (1). Multiple annular wind blades (3) are rotatably connected to the curved surface of the nacelle (2). Each wind blade (3) includes a blade and a rotating shaft. The rotating shaft is rotatably connected to the nacelle (2) through a bearing (4). The interior of the nacelle (2) is provided with a lubricating element (6) and a second magnet (8). The wind blades (3) are electrically connected to a pitch battery. The cracked friction element (5) includes an extended friction plate (51), a mating shaft (52), an extrusion block (54), and a semi-circular ring baffle (55). Multiple extended friction plates (51) are provided, and the multiple extended friction plates (51) are respectively located between adjacent rolling elements on the bearing (4). The upper and lower sides of the extended friction plates (51) are in contact with the inner and outer rings of the bearing (4), respectively. The mating shaft (52) is fixedly installed on the side of each extended friction plate (51). The extrusion block (54) is fixedly connected to the ends of two symmetrically positioned mating shafts (52). The extrusion block (54) adopts an elliptical structure. The curved surfaces of the two extrusion blocks (54) are in contact with two semi-circular ring baffles (55), respectively. The same annular connecting sleeve (53) is meshed with each mating shaft (52). An attraction element is provided between the two semi-circular ring baffles (55). The multi-layer expansion component (7) includes an air filling plate (71), an air cylinder (72), an air bag (73), and a fine hole (74). The air cylinder (72) is fixedly installed on the side of the air filling plate (71). The end of the air cylinder (72) is connected to the air bag (73) through a pipe. The fine hole (74) is opened on the air bag (73). The semi-circular baffle (55) is located between the gas filling plate (71) and the second magnet (8). A contact switch (75) is fixedly installed on the inner wall of the cabin (2). The contact switch (75) is located on the extension line of the end of the fine hole (74). The outer wall of the semi-circular baffle (55) is slidably connected to the cabin (2). The extended friction plate (51) adopts a symmetrically arranged arc plate structure. The arc surface of the arc plate is the same as the arc of the outer ring and inner ring of the bearing (4). A support frame is provided at the rotating shaft of the fan blade (3). The docking shaft (52) rotates at the support. The docking shaft (52) is elastically connected to the support frame through a torque spring (59). The bearing (4), the extended friction plate (51) and the extrusion block (54) rotate synchronously. When there is friction between the outer ring, inner ring and extended friction plate (51) of the bearing (4), when the inner ring is cracked, the extended friction plate (51) is subjected to increased friction from the inner ring and rotates clockwise. When the outer ring is cracked, the extended friction plate (51) is subjected to increased friction from the outer ring and rotates counterclockwise. The air filling plate (71) and the air cylinder (72) are elastically connected to each other by a return spring (76). The inflation speed of the air cylinder (72) to the air bag (73) is greater than the leakage speed at the fine hole (74) on the air bag (73). The lubricating component (6) includes a pressure plate (62), a piston (63), an injection tube (64), and an extension tube (66). The side of the pressure plate (62) is fixedly connected to the piston (63) via a round rod. The piston (63) slides inside the injection tube (64). A lubricating oil reservoir is provided inside the engine compartment (2). The injection tube (64) is connected to the lubricating oil reservoir. The end of the injection tube (64) is fixedly connected to the extension tube (66). The semi-circular baffle (55) is located between the second magnet (8) and the pressure plate (62).

2. The online monitoring system for a pitch battery according to claim 1, characterized in that: An angle sensor (510) is fixedly installed on the side of the support frame facing the extrusion block (54). The vertex of the major axis of the elliptical structure of the extrusion block (54) is in contact with the semi-circular baffle (55). The two semi-circular baffles (55) separate and form a circular structure.

3. The online monitoring system for a pitch battery according to claim 1, characterized in that: The attracting element includes a plug (56), a receiving sleeve (57) and a first magnet (58). The outer wall of the plug (56) is slidably connected to the receiving sleeve (57). The first magnet (58) is fixedly installed inside the receiving sleeve (57). The outer wall of the plug (56) is attached with a non-magnetic stainless steel layer. The receiving sleeve (57) and the plug (56) are respectively installed on two semi-circular baffles (55).

4. The online monitoring system for a pitch battery according to claim 1, characterized in that: The inner wall of the cabin (2) is provided with an expansion cavity for the inflation of the airbag (73). The expansion cavity adopts a cylindrical structure, and the cross-sectional diameter of the cylindrical structure is the same as the diameter of the airbag (73). The airbag (73) expands left and right in the expansion cavity.

5. The online monitoring system for a pitch battery according to claim 1, characterized in that: The end outlet of the extension tube (66) faces the bearing (4), the pressure plate (62) and the injection tube (64) are elastically connected by a helical spring (65), the outer wall of the fan blade (3) is rotatably connected to a support sleeve (61), and the pressure plate (62) and the gas filling plate (71) are both made of iron plate, cobalt plate or nickel plate.

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