CN216198690U

CN216198690U - Fan blade rotating shaft braking mechanism of wind driven generator

Info

Publication number: CN216198690U
Application number: CN202122040308.7U
Authority: CN
Inventors: 王记彩; 徐意
Original assignee: Jiaxing Nanyang Polytechnic Institute
Current assignee: Jiaxing Nanyang Polytechnic Institute
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-04-05
Anticipated expiration: 2031-08-27

Abstract

The utility model relates to a fan blade rotating shaft braking mechanism of a wind driven generator, which comprises a gear box, a fan blade rotating shaft, a brake disc, a control unit, a rotating speed sensor for detecting the rotating speed of the brake disc, a power sensor for detecting the output power of the generator and a plurality of brakes distributed along the circumferential direction of the brake disc, wherein each brake comprises a support, a driving force detection unit and two scissor arms, the middle parts of the scissor arms are hinged on the supports through pin shafts, one ends of the scissor arms are provided with friction plates used for being matched with the brake disc, the other ends of the scissor arms are connected together through electric push rods, the supports are fixedly connected with the gear box, and the driving force detection unit is used for detecting the force of the electric push rods for pushing the scissor arms. The utility model has the advantage of outputting the corresponding braking force according to the working state of the generator, and solves the problems that the impact sparks are caused by uniform braking force when the existing brake brakes, and related parts are easily damaged and fire risks are easily caused.

Description

Fan blade rotating shaft braking mechanism of wind driven generator

Technical Field

The utility model relates to the technical field of wind driven generators, in particular to a blade rotating shaft braking mechanism of a wind driven generator.

Background

The brake is an important part of the wind generating set, and the braking reliability of the brake directly influences the safe operation of the wind generating set. The main functions of the brake are as follows: when the wind generating set is in emergency shutdown, the high-speed shaft brake acts to finally enable the wind wheel to stop rotating completely. At present, a high-speed shaft brake mainly adopts a hydraulic disc brake, hydraulic pressure is used for braking, pressure relief is separated under the action of a spring, and a hydraulic system has the defect of oil leakage. In addition, the existing brake loses the braking function after stopping (system power failure), and the wind wheel can swing, so that the safety during maintenance is poor. Meanwhile, the braking force of the existing brake cannot be dynamically adjusted, so that impact and spark are caused by overlarge braking pressure, and related parts are easily damaged and fire risks are easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fan blade rotating shaft braking mechanism of a wind driven generator, which can output corresponding braking force according to the working state of the generator, and solves the problems that impact sparks are caused and related parts are easily damaged and fire risks are caused due to unified braking force during braking of the existing brake.

The second objective of the present invention is to provide a blade rotating shaft braking mechanism of a wind power generator, which does not generate oil leakage phenomenon and can maintain the brake in the current state regardless of the halt state, so as to solve the problem that the existing brake is oil pressure type, which generates oil leakage and loses the braking effect after the halt state, thereby causing danger during the halt maintenance.

The third purpose of the utility model is to further provide a fan blade rotating shaft braking mechanism of a wind driven generator, which can manually adjust the magnitude of braking force after shutdown, and solve the problem that the existing brake can not manually brake.

The technical problem is solved by the following technical scheme: a fan blade rotating shaft braking mechanism of a wind driven generator comprises a gear box, a fan blade rotating shaft which is rotationally connected to the gear box, a brake disc which is arranged on the fan blade rotating shaft, and a control unit, a rotating speed sensor which detects the rotating speed of the brake disc, a power sensor which detects the output power of the generator, and a plurality of brakes which are circumferentially distributed along the brake disc, wherein each brake comprises a support, a driving force detection unit and two scissor arms, the middle parts of the two scissor arms are hinged to the support through pin shafts, the two scissor arms are distributed on two axial sides of the brake disc, one end of each scissor arm is provided with a friction plate which is matched with the brake disc, the other end of each scissor arm drives the scissor arm to rotate by taking the pin shaft as the shaft so that the friction plate is abutted to an electric push rod on the brake disc to be connected together, the support is fixedly connected with the gear box, and the driving force detection unit is used for detecting the force of the electric push rod for pushing the scissor arms, the distance between the center of the stressed position and the center of the pin shaft when the driving shaft drives the scissor arm is H1, the distance between the center of the friction plate and the center of the pin shaft is H2, and H1 is more than twice of H2. When the fan blade rotating shaft rotates, the control unit enables the electric push rod to drive force F = (9550 ∙ P ∙ H2 ∙ S)/(2 ∙ N ∙ N ∙ R ∙ F ∙ H1) of the scissor arm, wherein N is the rotating speed of the brake disc, P is the output power of the generator, S is a safety coefficient, and the safety coefficient is 1.2-1.8; n is the number of brakes; r is the braking radius of the brake disc; f is the friction coefficient of the brake pad. Wherein R is in meters, n is in revolutions per minute, P is in kilowatts, and F is in cattle. When the scissors are used, the conductive push rod extends to enable one ends, far away from the brake disc, of the two scissor arms to be unfolded, so that the friction plates are driven to clamp the brake disc from two sides of the brake disc to brake. According to the technical scheme, the corresponding braking force is output according to the difference of the rotating speed, the braking radius of the rotating disc, the output power of the generator and the like to realize rotation, so that reliable braking can be guaranteed, and damage to parts and fire hazard caused by electric sparks and overlarge impact can be avoided.

Preferably, the electric push rod comprises a base body, a driving rod capable of being telescopically inserted into the base body and a power mechanism for driving the driving rod to stretch relative to the base body, the driving force detection unit comprises a driving force sensor, a driving spring and a fixed driving block and a movable driving block, the fixed driving block and the movable driving block are fixedly arranged at the position of the driving rod when the driving rod is output, one end of the driving spring is connected with the fixed driving block, the other end of the driving spring is connected with the movable driving block, one scissor arm is fixedly connected with the base body, the other scissor arm is sleeved on the driving rod, the movable driving block is driven by the driving spring to abut against the other scissor arm, and the driving force sensor is used for detecting the force of the movable driving block for driving the other scissor arm. Provides a specific technical scheme of a connecting structure and a force detection mechanism between an electric push rod and two scissor arms. The technical scheme can conveniently acquire the force for driving the scissor arm, thereby braking the braking force. When the driving rod is contracted and the other scissor arm can be pulled to move together, the electric push rod is contracted to release the braking action, so that the friction plate can release the braking action.

Preferably, the clearance between the two friction plates and the surface of the brake disc is 2-4 mm. The braking force can be more conveniently and accurately obtained through the driving force of the driving rod or the positive pressure of the friction plate.

Preferably, the deviation of the clearance between one friction plate and the disc surface from the clearance between the other friction plate and the disc surface is 0.5mm or less. The consistency of the force which can receive braking at two sides is good.

Preferably, an inner cavity is formed in the base body, the driving rod penetrates through the end wall at one end of the inner cavity, the power mechanism comprises a screw rod rotatably connected to the end wall at the other end of the inner cavity, a motor for driving the screw rod to rotate and a threaded sleeve in threaded connection with the screw rod, the threaded sleeve is located in the inner cavity, a driving sleeve is arranged at one end, located in the inner cavity, of the driving rod, the driving sleeve is arranged on the screw rod in a sleeved mode and is abutted against the threaded sleeve, a rotation stopping rod penetrating through the threaded sleeve is arranged in the inner cavity, and the rotation stopping rod is parallel to the screw rod. Provides a technical scheme of the power mechanism. This technical scheme can improve the convenience when making, can make the inner chamber have along half two that the lead screw extending direction distributes and constitute promptly, assemble the lead screw, after the actuating lever was assembled to half another, realized the connection of screw thread head with the actuating lever with the drive actuating lever translation promptly with half butt joint together two. If the threaded sleeve and the driving rod are fixed through other welding bolt connection, the convenience is reduced during manufacturing. The mode can conveniently keep the coaxial drive of the screw rod and the drive rod, and prevent the force of the screw head driving the drive rod from being unilateral to cause uneven wear to the screw rod. In addition, when the motor part rotates, the screw rod can be kept at the current position and is not moved, so that the brake keeps the current rotating force unchanged. The electric push rod performs braking, so that the dripping phenomenon cannot be generated, and the electric push rod is clean, environment-friendly and simple in structure. The second utility model purpose is realized.

Preferably, the screw rod is supported on the end wall at the other end of the inner cavity through a first bearing, the screw rod is further supported on the inner circumferential surface of the driving sleeve through a second bearing, a plurality of supporting rolling balls are arranged on the outer circumferential surface of the outer ring of the second bearing, the second bearing is connected with the driving sleeve through the supporting rolling balls, and a mirror surface layer is arranged on the inner circumferential surface of the driving sleeve. This scheme has realized supporting simultaneously through a bearing to two butt joints axle together, has practiced thrift the bearing quantity, has improved structural compactness, prevents that lead screw and actuating lever from leading to the deformation for the cantilever is connected.

Preferably, the screw rod is provided with a driven wheel positioned outside the seat body, the power output shaft of the motor is provided with a driving wheel, the driving wheel and the driven wheel are connected together through a transmission belt, the end surface of the driven wheel facing one end of the seat body is provided with a screw rod part friction layer, the seat body is internally provided with a plurality of brake rods extending along the extension direction of the screw rod in a penetrating way, the brake rods are aligned with the screw rod part friction layer, the end surface of each brake rod is provided with a brake rod part friction layer, a brake spring for driving the brake rods to move towards the driven wheel so that the brake rod part friction layer and the screw rod part friction layer are abutted together to brake the screw rod is arranged between the seat body and the brake rods, the brake rods are provided with brake rod part ferromagnets, the seat body is further provided with electromagnets for adsorbing the brake rod part ferromagnets to enable the brake rods to move towards the direction far away from the driven wheel so that the brake rod part friction layer and the screw rod part friction layer are disengaged, when the motor is electrified, the electromagnet is also electrified, and when the motor is not electrified, the electromagnet is also not electrified. The existing brake realizes the accidental rotation prevention of the screw rod through the brake of the motor, but the screw rod has a certain rotating space after the motor brakes, and if the belt drives the screw rod, the screw rod still can rotate in a mode that the belt slips. The effect of preventing accidental rotation is poor when the existing screw rod is used for transmission. According to the technical scheme, the driven wheel can rotate freely to drive the screw rod to rotate when the motor is driven, and the motor can brake the driven wheel after stopping, so that the screw rod at the upper end cannot be rotated, and the reliability of preventing the screw rod from being rotated accidentally is good. The motor does not need to be braked.

The utility model also comprises a rocking handle for rotating the screw rod, the rocking handle is provided with a connector, the end surface of the screw rod, which is positioned at the outer end of the seat body, is provided with a connecting hole matched with the connector, the hole wall of the connecting hole is penetrated with a plurality of brake release levers, the brake levers are provided with driving blocks, and the brake release levers are aligned with the driving blocks in a one-to-one correspondence manner; at least one of the driving block and the brake release lever is provided with a brake lever separation guide inclined plane which guides the brake lever to be separated from the friction layer of the screw rod when the brake release lever continues to move towards the rotating lever after the driving block and the brake release lever are abutted together; the connector is provided with a conical driving head for driving the brake release lever to move towards the outside of the connecting hole. The utility model also makes it possible to apply and release brakes to the screw with respect to those manual rotations after the stoppage. The mode of carrying out the operation through the manual work does: the connector of rocking handle inserts in the connecting hole of lead screw, and the toper drive head of male in-process drives the system release lever and removes towards the driver block, and the result of removal is for making brake lever extrusion brake spring and separately with lead screw portion friction layer to the lead screw is not pinned, then rotates the rocking handle, and the rocking handle passes through connector drive lead screw and rotates. The connecting head and the connecting hole can be connected through a key or designed into a cylindrical fit to realize that the connecting head cannot rotate in the connecting hole when rotating so as to drive the screw rod to rotate together. Realize the third utility model purpose in both ends.

Preferably, the brake release lever is provided with a limit block, when the limit block abuts against the base body, the depth of the brake release lever inserted into the connecting hole reaches a limit position, and the brake release lever is staggered with the end face of the conical driving head in the process that the connector is inserted into the connecting hole when the depth of the brake release lever inserted into the connecting hole reaches the limit position. The inconvenience of inserting the connector due to the excessive inward movement of the brake release lever can be avoided.

Preferably, the driving block is a ring extending along the circumferential direction of the rotating rod, the ferromagnetic body is disposed on the driving block, and the braking spring is connected to the driving block to realize connection with the braking rod. The structure is compact, and the convenience in assembly is good.

Preferably, a friction plate release spring for driving one end of the scissor arm far away from the friction plate to close is further arranged between the two scissor arms. Reliable disengagement of the friction plates can be achieved. The friction plate release spring is designed to be negligible in terms of the force which is equivalent to the force for driving the scissor arm to rotate by the driving rod.

The utility model has the following beneficial effects: the structure is simple, and no water leakage is generated; the brake state can be maintained after the brake state is stopped; after the machine is stopped, the brake can be driven manually for braking.

Drawings

FIG. 1 is a schematic view of the present invention without the rocker handle shown;

FIG. 2 is a schematic view of the electric putter in a holding state;

FIG. 3 is an enlarged partial schematic view at A of FIG. 2;

FIG. 4 is a schematic enlarged view of a portion of FIG. 2 at B;

FIG. 5 is a schematic view of the electric putter being manually adjusted;

FIG. 6 is an enlarged partial schematic view at C of FIG. 5;

fig. 7 is a schematic distribution diagram of the brake.

In the figure: the device comprises a gear box 1, a fan blade rotating shaft 3, a brake disc 4, a support 5, a pin shaft 6, a scissor arm 7, a friction plate 8, a friction plate release spring 9, a seat body 10, a driving force sensor 11, a driving spring 12, a driving rod 13, a fixed driving block 15, a movable driving block 16, a scissor arm 17, another scissor arm 18, a hook head 19, a distance H1 from the center of the pin shaft to the center of the stressed position when the driving shaft drives the scissor arm, a distance H2 from the center of the friction plate to the center of the pin shaft, a gap D between the friction plate and the surface of the brake disc, an inner cavity 20, a screw rod 21, a motor 22, a threaded sleeve 23, a driving sleeve 24, a rotation stopping rod 25, a first bearing 26, a second bearing 27, a supporting rolling ball 28, a driven wheel 29, a driving wheel 30, a driving belt 31, a friction layer 32 of the screw rod part, a brake rod 33, a brake spring 34, a ferromagnetic body 35 of the brake rod part, an electromagnet 36, a rocking handle 37, a connecting head 38, The brake release lever comprises a connecting hole 39, a brake release lever 40, a driving block 41, a brake lever separating guide inclined surface 43, a conical driving head 44, a limiting block 45, an end surface 46 of the conical driving head, a rotating speed sensor 47, a generator 48, a power sensor 49 and a brake 50.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 7, a fan blade rotating shaft braking mechanism of a wind driven generator includes a gear box 1, a fan blade rotating shaft 3 rotatably connected to the gear box, a brake disc 4 disposed on the fan blade rotating shaft, a control unit, a rotation speed sensor 47 for detecting the rotation speed of the brake disc, a power sensor 49 for detecting the output power of a generator 48, and a plurality of brakes 50 circumferentially distributed along the brake disc.

The brake comprises a support 5, a driving force detection unit and two scissor arms 7, the middle parts of which are hinged on the support through a pin shaft 6. The two scissor arms are symmetrically distributed on the two axial sides of the brake disc. One end of the scissor arm is provided with a friction plate 8 matched with the brake disc, and the other end of the scissor arm is connected with an electric push rod which drives the scissor arm to rotate by taking the pin shaft as a shaft so that the friction plate is abutted to the brake disc. The support is fixedly connected with the gear box. The electric push rod is connected with the engine unit only through the scissor arm and the support. A friction plate release spring 9 for driving one end of the scissor arm far away from the friction plate to close is also arranged between the two scissor arms. The electric push rod comprises a seat body 10, a driving force sensor 11, a driving spring 12, a driving rod 13 which can be telescopically arranged on the seat body in a penetrating mode and a power mechanism which drives the driving rod to stretch relative to the seat body. The driving rod is provided with a fixed driving block 15 and a movable driving block 16. One end of the driving spring is connected with the fixed driving block, the other end of the driving spring is connected with the movable driving block, one shear arm 17 is fixedly connected with the base body, and the other shear arm 18 is sleeved on the driving rod. The movable driving block is driven by the driving spring to abut against the other scissor arm. The driving force sensor is used for detecting the force of the movable driving block driving the other scissor arm, and the force is also equal to the force of the electric push rod driving one scissor arm. The driving rod is provided with a hook head 19, so that when the driving rod is contracted, one ends of the two scissor arms far away from the friction plate can be driven to be folded to lose the braking function, and the single scissor arm can be prevented from transitionally rotating by taking the pin shaft as the shaft. The distance H1 between the center of the stress position and the center of the pin shaft is the same when the driving shaft of the two scissor arms drives the scissor arms, the distance H2 between the centers of the two friction plates and the center of the pin shaft is the same, H1 is more than twice of H2, and the gaps D between the two friction plates and the surface of the brake disc are 2-4 mm. The deviation of the clearance between one friction plate and the surface of the brake disc from the clearance between the other friction plate and the surface of the brake disc is less than 0.5 mm.

An inner cavity 20 is arranged in the base body, the driving rod penetrates through the end wall at one end of the inner cavity, and the power mechanism comprises a screw rod 21 rotatably connected to the end wall at the other end of the inner cavity, a motor 22 driving the screw rod to rotate and a threaded sleeve 23 in threaded connection with the screw rod. The motor is fixed on the seat body. The threaded sleeve is positioned in the inner cavity, one end of the driving rod, which is positioned in the inner cavity, is provided with a driving sleeve 24, the driving sleeve is sleeved on the screw rod and is butted with the threaded sleeve, a rotation stopping rod 25 which is arranged in the threaded sleeve in a penetrating way is arranged in the inner cavity, and the rotation stopping rod is parallel to the screw rod. The lead screw passes through first bearing 26 to be supported on the end wall at the inner chamber other end, and the lead screw still supports on the inner peripheral surface of drive sleeve through second bearing 27, is equipped with a plurality of support balls 28 on the outer peripheral face of the outer lane of second bearing, and the second bearing is connected with the drive sleeve through supporting the ball, and the inner peripheral surface of drive sleeve is equipped with the mirror layer for slide laborsaving on supporting the ball when the actuating lever translation. Be equipped with on the lead screw and be located the outside follow driving wheel 29 of pedestal, be equipped with the action wheel 30 on the power output shaft of motor, the action wheel links together through drive belt 31 with following the driving wheel, be equipped with silk pole portion frictional layer 32 on the terminal surface towards pedestal one end from the driving wheel, wear to be equipped with a plurality of brake levers 33 that extend along the lead screw extending direction in the pedestal, the brake lever aligns with silk pole portion frictional layer, be equipped with brake lever portion frictional layer on the terminal surface of brake lever, thereby it moves towards the brake lever to be equipped with the drive brake lever between pedestal and the brake lever makes brake lever portion frictional layer and lead screw portion frictional layer butt together and carry out the brake spring 34 of braking to the lead screw, be equipped with brake lever portion ferromagnet 35 on the brake lever. The seat body is also provided with an electromagnet 36 which absorbs the ferromagnetic body at the brake rod part to enable the brake rod to move towards the direction far away from the driven wheel so as to enable the friction layer at the brake rod part to be separated from the friction layer at the screw rod part. The motor and the electromagnet are powered on and powered off simultaneously, namely, the motor and the electromagnet work and stop simultaneously. The brake device also comprises a rocking handle 37 for rotating the screw rod, the rocking handle is provided with a connector 38, the end surface of the screw rod, which is positioned at the outer end of the seat body, is provided with a connecting hole 39 matched with the connector, the hole wall of the connecting hole is penetrated with a plurality of brake release levers 40, and the brake lever is provided with a driving block 41. According to the technical scheme, the driving block is made of ferromagnets, and the groove rotating rod part is made of ferromagnets. The brake release levers are aligned with the driving blocks in a one-to-one correspondence manner; and at least one of the driving block and the brake release lever is provided with a brake lever separation guide inclined surface 43 which guides the brake lever to be separated from the friction layer of the screw rod when the brake release lever continues to move towards the rotating lever after the driving block and the brake release lever are abutted together, and in the embodiment, the two are provided with separation guide inclined surfaces so that the two are in surface fit when being driven in contact. The connector is provided with a conical driving head 44 for driving the brake release lever to move towards the outside of the connecting hole. The brake release lever is provided with a limit block 45, when the limit block and the base body are abutted together (namely the state in fig. 4), the depth of the brake release lever inserted into the connecting hole reaches the limit position, and the brake release lever is staggered with the end surface 46 of the conical driving head in the process that the connector is inserted into the connecting hole when the depth of the brake release lever inserted into the connecting hole reaches the limit position. The driving block is in a ring shape extending along the circumferential direction of the rotating rod. The brake spring is connected to the driving block to realize connection with the brake rod. When the fan blade rotating shaft rotates, the control unit enables the electric push rod to drive force F = (9550 ∙ P ∙ H2 ∙ S)/(2 ∙ N ∙ N ∙ R ∙ F ∙ H1) of the scissor arm, N is the rotating speed of a brake disc (unit is rotation per minute), P is the output power of a generator (unit is kilowatt), S is a safety factor (the safety factor is 1.2 to 1.8 is optimal), and N is the number of brakes; r is the braking radius of the brake disc; f is the friction coefficient of the brake pad, namely when the force detection sensor detects that the force reaches the direct current, the motor is powered off and stops working.

Claims

1. A fan blade rotating shaft braking mechanism of a wind driven generator comprises a gear box, a fan blade rotating shaft which is rotationally connected to the gear box, a brake disc which is arranged on the fan blade rotating shaft, and a control unit, a rotating speed sensor which detects the rotating speed of the brake disc, a power sensor which detects the output power of the generator, and a plurality of brakes which are circumferentially distributed along the brake disc, wherein each brake comprises a support, a driving force detection unit and two scissor arms, the middle parts of the two scissor arms are hinged to the support through pin shafts, the two scissor arms are distributed on two axial sides of the brake disc, one end of each scissor arm is provided with a friction plate which is matched with the brake disc, the other end of each scissor arm drives the scissor arm to rotate by taking the pin shaft as the shaft so that the friction plate is abutted to an electric push rod on the brake disc to be connected together, the support is fixedly connected with the gear box, and the driving force detection unit is used for detecting the force of the electric push rod for pushing the scissor arms, the distance between the center of the stressed position and the center of the pin shaft when the driving shaft drives the scissor arm is H1, the distance between the center of the friction plate and the center of the pin shaft is H2, and H1 is more than twice of H2.

2. The brake mechanism for the rotating shaft of the fan blade of the wind driven generator as claimed in claim 1, the electric push rod comprises a base body, a drive rod which can be telescopically arranged on the base body in a penetrating way and a power mechanism which drives the drive rod to extend and retract relative to the base body, the driving force detection unit comprises a driving force sensor, a driving spring, a fixed driving block which keeps constant with the position of the driving rod when the driving rod is output, and a movable driving block which is sleeved on the driving rod, the one end of driving spring links together with deciding the drive block, and the other end links together with movable drive block, and a scissors arm is in the same place with the pedestal rigid coupling, and another scissors arm cover is established on the actuating lever, and movable drive block passes through driving spring drive and in the same place with another scissors arm butt, drive force sensor is used for detecting the power of another scissors arm of movable drive block drive.

3. The blade rotating shaft braking mechanism of the wind driven generator according to claim 1 or 2, wherein the clearance between the two friction plates and the surface of the brake disc is 2-4 mm.

4. The blade rotating shaft braking mechanism of the wind driven generator as claimed in claim 3, wherein the deviation of the gap between one friction plate and the surface of the brake disc and the gap between the other friction plate and the surface of the brake disc is less than 0.5 mm.

5. The blade rotating shaft braking mechanism of the wind driven generator according to claim 2, wherein an inner cavity is formed in the base body, the driving rod is arranged on an end wall at one end of the inner cavity in a penetrating manner, the power mechanism comprises a screw rod rotatably connected to an end wall at the other end of the inner cavity, a motor for driving the screw rod to rotate, and a threaded sleeve screwed on the screw rod, the threaded sleeve is arranged in the inner cavity, a driving sleeve is arranged at one end of the driving rod in the inner cavity, the driving sleeve is sleeved on the screw rod and abutted against the threaded sleeve, a rotation stopping rod arranged in the threaded sleeve in a penetrating manner is arranged in the inner cavity, and the rotation stopping rod is parallel to the screw rod.

6. The blade rotating shaft braking mechanism of the wind driven generator as claimed in claim 5, wherein the screw rod is supported on the end wall at the other end of the inner cavity through a first bearing, the screw rod is further supported on the inner circumferential surface of the driving sleeve through a second bearing, a plurality of supporting rolling balls are arranged on the outer circumferential surface of the outer ring of the second bearing, the second bearing is connected with the driving sleeve through the supporting rolling balls, and the inner circumferential surface of the driving sleeve is provided with a mirror layer.

7. The blade/shaft brake mechanism of claim 5, wherein the screw has a driven wheel disposed outside the base, the motor has a driving wheel disposed on a power output shaft, the driving wheel and the driven wheel are connected together by a transmission belt, a friction layer of the screw rod portion is disposed on an end surface of the driven wheel facing one end of the base, a plurality of brake levers extending along an extending direction of the screw rod are disposed in the base, the brake levers are aligned with the friction layer of the screw rod portion, a brake lever portion layer is disposed on an end surface of the brake levers, a brake spring is disposed between the base and the brake levers for driving the brake levers to move toward the driven wheel so that the friction layer of the brake lever portion and the friction layer of the screw rod portion abut against each other to brake the screw rod, a ferromagnetic body of the brake lever portion is disposed on the brake levers, and the base further has a ferromagnetic body for absorbing the ferromagnetic body of the brake lever portion so that the brake lever moves away from the driven wheel to brake lever to brake the screw rod The movable rod part friction layer and the screw rod part friction layer are separated from each other, the electromagnet is powered on when the motor is powered on, and the electromagnet is also powered off when the motor is powered off.

8. The blade rotating shaft braking mechanism of the wind driven generator according to claim 7, further comprising a rocking handle for rotating the lead screw, wherein the rocking handle is provided with a connector, a connecting hole matched with the connector is formed in an end face of the lead screw located at the outer end of the seat body, a plurality of brake releasing levers are arranged on a hole wall of the connecting hole in a penetrating manner, the brake lever is provided with a driving block, and the brake releasing levers are aligned with the driving block in a one-to-one correspondence manner; at least one of the driving block and the brake release lever is provided with a brake lever separation guide inclined plane which guides the brake lever to be separated from the friction layer of the screw rod when the brake release lever continues to move towards the rotating lever after the driving block and the brake release lever are abutted together; the connector is provided with a conical driving head for driving the brake release lever to move towards the outside of the connecting hole.

9. The fan blade rotating shaft braking mechanism of the wind driven generator according to claim 8, wherein the brake release lever is provided with a limiting block, when the limiting block abuts against the base body, the depth of the brake release lever inserted into the connecting hole reaches a limit position, and when the brake release lever is located at a position where the depth of the brake release lever inserted into the connecting hole reaches the limit position, the brake release lever is staggered with the end surface of the conical driving head in the process that the connecting head is inserted into the connecting hole.

10. The wind blade rotating shaft braking mechanism of the wind driven generator according to claim 8, wherein the driving block is annular and extends along the circumferential direction of the rotating rod, the ferromagnetic body is arranged on the driving block, and the braking spring is connected to the driving block to realize connection with the braking rod.