A beam-shaft type fan

Abstract

This utility model discloses a beam-shaft type wind turbine, belonging to the technical field of wind power generation equipment. It adopts a beam-shaft separation and functional integration architecture. By physically separating the fixed main load-bearing beam from the pure torsion transmission main shaft, the load transmission path and torque transmission path are completely decoupled. Through the innovative cooperation of pitch control and connecting bearings with double sets of slide rail sliders, hub rotation support and high-precision pitch guidance are achieved simultaneously. By integrating a braking mechanism inside the hub and directly connecting it to the main load-bearing beam, rapid braking is achieved without interfering with torque transmission. This utility model fundamentally optimizes the stress state of the core components of the wind turbine and has the advantages of compact structure, stable operation, high reliability, and low maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, specifically to a whole machine structure design, and in particular to a wind turbine generator set that adopts physical separation of fixed beam and rotating shaft, highly integrated functions, and has decoupling characteristics of load and torque transmission path. Background Technology

[0002] Traditional horizontal-axis wind turbine generators generally adopt a centralized drivetrain layout integrating the main shaft, bearings, and gearbox. In this architecture, a rotating main shaft running through the nacelle simultaneously performs two core functions: at the front end, it supports the hub via the main bearing to withstand all the complex loads transmitted from the blades, including aerodynamic thrust, gravity, bending moment, and overturning moment; at the rear end, it transmits the rotational torque captured by the turbine to the gearbox and generator. This functionally coupled design results in the main shaft being subjected to severe stress under combined bending, torsion, and shear forces for extended periods. To meet strength and fatigue life requirements, the main shaft and its connecting parts have to be over-designed, resulting in a bulky structure, high material costs, and severe stress concentrations at the hub connection, bearing shoulders, splines, and other locations. These areas become the main sites for fatigue crack initiation and propagation, hindering further improvements in the unit's reliability and design life.

[0003] Furthermore, traditional wind turbines suffer from dispersed subsystem layouts and poor coordination: pitch systems are often independent electric architectures with "one blade, one drive," resulting in redundant components, high costs, and synchronization errors; mechanical brakes are typically located on the high-speed shaft or at the end of the nacelle, leading to delayed braking response and requiring the braking force to be transmitted in reverse through a long shaft system, which can easily cause torsional vibration; generators are often suspended at the rear of the nacelle, resulting in a high center of gravity and affecting overturning stability; and the tower and nacelle are often rigidly directly connected, resulting in short vibration transmission paths and exacerbating structural fatigue. This discrete design leads to complex overall structure, low space utilization, and inconvenient maintenance, making it difficult to meet the current wind power industry's core demands for cost reduction, efficiency improvement, reliability enhancement, and adaptability to complex environments.

[0004] Therefore, there is an urgent need for a new type of wind turbine design that innovates from the perspective of overall architecture principles, can completely decouple key functional paths, achieve high system integration, and optimize the overall dynamic performance of the turbine. Utility Model Content

[0005] This utility model aims to overcome the shortcomings of existing technologies and provide a beam-shaft type fan. By proposing an innovative architecture of "beam-shaft separation and functional integration", it fundamentally solves the problems of load and torque coupling transmission, dispersed system layout, and severe stress on key components in traditional fans, so as to achieve a comprehensive improvement in the reliability, economy, maintainability, and environmental adaptability of the whole machine.

[0006] In order to solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: Firstly, this utility model provides a beam-shaft type fan.

[0007] This fan system systematically integrates the following core modules: Basic connection and yaw module: This includes the truss-type wind turbine tower and the yaw system consisting of a slewing bearing and a short cylindrical section. The top of the short cylindrical section is welded to the lower platform as a single unit, forming a rigid transition structure. This module achieves low-friction, smooth yaw and disperses and transitions nacelle loads through the short cylindrical section.

[0008] Main load-bearing and vibration damping module: The core is a fixed, non-rotating main load-bearing beam, which serves as the "static skeleton" of the entire machine. The rear end of the beam is connected to the lower platform through an omnidirectional elastic vibration damping support structure. This support structure innovatively adopts a "rear hinge + front multi-directional buffer" form: the rear part achieves flexible hinged connection through hinge connectors with rubber bushings to absorb front-to-back and torsional vibrations; the front part provides omnidirectional elastic constraints and displacement limits through rubber pads and limiting baffles arranged below, above, and on the left and right sides, effectively isolating the transmission of vibration to the tower.

[0009] Hub Connection and Pitch Execution Module: The hub is connected to the front end of the main load-bearing beam via a "pitch and connecting bearing" that integrates rotary support and pitch guidance functions. The inner and outer rings of this bearing are connected to the beam and hub respectively via two sets of slide rails parallel to the beam axis. This design precisely constrains the bearing to allow only axial sliding. The blades are mounted to the hub via root slewing bearings and connected to the outer ring of the bearing via a hinged linkage mechanism. The integrated pitch mechanism is driven by a single hydraulic cylinder. The cylinder piston rod acts directly on the inner ring of the bearing, converting linear motion into synchronous rotation of all blades through the aforementioned mechanical chain.

[0010] Torque transmission and speed-up module: The rotary transmission main shaft is independently installed inside the main load-bearing beam, with no structural connection to the beam, forming a "pure torque transmission path". Its front end is linked to the wheel hub through a first-stage planetary speed-up unit. After the power is initially increased in speed by the first-stage planetary speed-up unit, it is further increased in speed by a second-stage bevel gear speed-up unit and achieves a 90° reversal. The third-stage speed-up mechanism offers two preferred options: one is a three-stage bevel gear speed-up unit, which can reverse direction again and make the output shaft parallel to the main shaft; the other is a synchronous belt drive assembly, which achieves lightweight and low-noise speed-up. Through the two-stage reversal, the generator 17 can be positioned low on the lower platform near the center of the tower, significantly lowering the overall center of gravity.

[0011] Safety Braking Module: The hub-integrated mechanical brake mechanism is fully embedded inside the wheel hub. Its integrated mounting bracket is fixed to the main load-bearing beam, and the brake drum is fixed to the rotating inner wall of the wheel hub. During braking, the brake hydraulic drive cylinder pushes the brake shoe assembly through the S-shaped camshaft to generate braking force, and the reaction force is directly borne by the main load-bearing beam. The worm gear mechanism integrated in the adjusting arm can realize automatic compensation of braking clearance, and sensors are equipped for status monitoring.

[0012] Specifically, this utility model provides a beam-shaft type fan, comprising: Wind turbine towers; A yaw system installed at the top of the wind turbine tower; The yaw system is installed on the lower platform at the top of the wind turbine tower; The main load-bearing beam, whose axis is coaxial with the rotation axis of the wind turbine, is a fixed and non-rotating load-bearing component. Its rear end is connected to the lower platform through a universal elastic vibration damping support structure. The hub is rotatably connected to the front end of the main load-bearing beam via a pitch and connecting bearing and at least two sets of slide rails and sliders; the inner ring of the pitch and connecting bearing is connected to the main load-bearing beam via a first set of slide rails and sliders, and its outer ring is connected to the hub via a second set of slide rails and sliders, so that the pitch and connecting bearing is constrained to slide only along the axial direction of the main load-bearing beam; Multiple blades, the root of each blade is mounted on the hub via a blade root slewing bearing, and is connected to the outer ring of the pitch and connecting bearing via a hinge linkage mechanism; An integrated pitch mechanism includes a hydraulic cylinder fixedly mounted on the main load-bearing beam, wherein the piston rod of the hydraulic cylinder is connected to the pitch and the inner ring of the connecting bearing; The rotary transmission spindle passes through the interior of the main load-bearing beam and is independent of the main load-bearing beam in terms of mechanical structure and force path. The three-stage speed-increasing transmission system includes a first-stage planetary speed-increasing machine, a second-stage bevel gear speed-increasing machine, and a third-stage speed-increasing mechanism connected in series. The housing of the first-stage planetary speed-increasing machine is fixedly connected to the hub, and its output end is connected to the front end of the rotary transmission main shaft. The output end of the third-stage speed-increasing mechanism is connected to a generator. The hub-integrated mechanical braking mechanism includes an integrated mounting bracket fixed to the front end of the main load-bearing beam and extending into the hub, and a brake drum fixed to the inner wall of the hub.

[0013] Furthermore, the yaw system includes a slewing bearing and a short cylindrical section; the inner ring of the slewing bearing is fixedly connected to the top of the wind turbine tower, and its outer ring is fixedly connected to the bottom of the short cylindrical section; the top of the short cylindrical section is welded to the bottom surface of the lower platform.

[0014] Furthermore, the omnidirectional elastic vibration damping support structure includes a rear hinge vibration damping module and a front buffer limiting module; the rear hinge vibration damping module includes a hinge connector fixed to the lower platform and a rubber bushing disposed on the pin of the hinge connector, and the rear end of the main load-bearing beam is flexibly hinged to the hinge connector through the rubber bushing; the front buffer limiting module includes a first rubber pad disposed below the front of the main load-bearing beam, an upper limiting baffle disposed above the front of the main load-bearing beam, and lateral rubber pads and lateral limiting baffles symmetrically disposed on the left and right sides of the front of the main load-bearing beam.

[0015] Furthermore, the third-stage speed-increasing mechanism is a three-stage bevel gear speed-increasing machine, whose input end is connected to the output end of the second-stage bevel gear speed-increasing machine, and whose output end is connected to the input shaft of the generator; the second-stage bevel gear speed-increasing machine and the third-stage bevel gear speed-increasing machine work together to achieve two orthogonal 90° power reversals, so that the input axis of the generator is parallel to and offset upward from the axis of the rotary transmission main shaft.

[0016] Furthermore, the third-stage speed-increasing mechanism is a synchronous belt drive assembly, which includes: a third-stage synchronous belt drive pulley fixed to the output end of the second-stage bevel gear speed-increasing machine, a third-stage synchronous belt driven pulley fixed to the input shaft of the generator, an arc-tooth synchronous belt meshing with the drive pulley and the driven pulley, and an automatic tensioning device acting on the outside of the synchronous belt.

[0017] Furthermore, the hub-integrated mechanical brake mechanism also includes: Two brake shoe assemblies are symmetrically arranged inside the brake drum, with their lower ends hinged to the integrated mounting bracket and their upper ends equipped with rollers; An S-shaped camshaft is rotatably mounted on the integrated mounting bracket, and its profile contacts the roller at the upper end of the brake shoe assembly. An adjusting arm is fixedly connected to one end of the S-shaped camshaft, and an internal worm gear mechanism for automatically compensating for the wear gap of the friction plate is integrated therein. A brake hydraulic drive cylinder, the cylinder body of which is fixed on the integrated mounting bracket, and the piston rod is hinged to the adjusting arm; A return spring assembly is connected between the brake shoe assembly and the integrated mounting bracket.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adopts a "beam-shaft separation" design to physically separate the load and torque transmission paths, so that the main load-bearing beam and the main shaft perform their respective functions, and the stress state is simple and clear, which greatly improves the stress level of key components, improves fatigue life and reliability from the source, and provides space for lightweight design.

[0019] In this invention, key actuators such as the pitch control and braking systems are deeply integrated around the hub and main load-bearing beam, resulting in an extremely short force flow path and rapid response. All subsystems are designed around a unified architecture, ensuring good compatibility, a compact overall structure, and high space utilization.

[0020] The universal elastic vibration damping support system in this invention effectively suppresses multi-dimensional vibration transmission and improves operational stability. The low-positioned generator lowers the overall center of gravity, enhancing anti-overturning capability. The load transfer path is clear and rigid, resulting in good overall stability.

[0021] The braking system of this invention has automatic wear compensation and condition monitoring functions, the pitch system has high mechanical synchronization accuracy, and the transmission system can use a maintenance-free synchronous belt solution, which significantly reduces the operation and maintenance costs and workload throughout the entire life cycle.

[0022] This utility model provides two transmission terminal solutions: gear and synchronous belt. The two solutions can be flexibly selected according to different application scenarios (such as power, cost, and environmental requirements), which enhances the market adaptability of the product. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 for Figure 1 A magnified structural diagram of region A in the middle.

[0026] Figure 3 This is a schematic diagram of the vibration reduction module in this utility model.

[0027] Figure 4 This is a schematic diagram showing the connection between the hinge connector and the rubber bushing in this utility model.

[0028] Figure 5 This is a top view of the vibration reduction module in this utility model.

[0029] Figure 6 This is a schematic diagram of the structure of the present invention for synchronous belt speed increase.

[0030] Figure 7 for Figure 6 A top-view structural diagram.

[0031] Figure 8 This is a schematic diagram of the structure of the all-gear transmission of this utility model.

[0032] Figure 9 for Figure 8 A top-view structural diagram.

[0033] Figure 10 A schematic diagram of the variable pitch structure of the utility model.

[0034] Figure 11 A top view of the variable pitch structure of the utility model.

[0035] Figure 12 A three-dimensional structural diagram of the variable pitch structure of the utility model.

[0036] Figure 13 This is a schematic diagram of the power structure of the brake hydraulic drive cylinder in the utility model.

[0037] Figure 14 This is a schematic diagram of the internal structure of the brake drum in this utility model.

[0038] In the diagram: 1 is the wind turbine tower, 2 is the slewing bearing, 3 is the short-section cylinder, 4 is the lower platform, 5 is the main load-bearing beam, 6 is the rotary transmission main shaft, 7 is the brake shoe assembly, 8 is the hub, 9 is the blade, 10 is the hinge connector, 11 is the rubber bushing, 12a is the first rubber pad, 12b is the lateral rubber pad, 13a is the upper limit baffle, 13b is the lateral limit baffle, 14 is the first-stage planetary speed increaser, 15 is the second-stage bevel gear speed increaser, and 16 is the third-stage bevel gear speed increaser. 17 is the generator, 18 is the pitch and connecting bearing, 19 is the slide rail slider, 20 is the hydraulic cylinder, 21 is the hinge linkage mechanism, 22 is the blade root slewing bearing, 23 is the hub integrated mechanical brake mechanism, 24 is the three-stage synchronous belt drive pulley, 25 is the three-stage synchronous belt, 26 is the three-stage synchronous belt driven pulley, 27 is the automatic tensioning device, 28 is the brake hydraulic drive cylinder, 29 is the adjusting arm, 30 is the S-type camshaft, 31 is the return spring assembly, and 32 is the beam and hub connecting bearing. Detailed Implementation

[0039] The present invention will be further described below with reference to specific embodiments.

[0040] Example 1: All-gear driven beam-shaft fan This embodiment describes in detail a beam-shaft fan that uses a three-stage bevel gear speed increaser.

[0041] The wind turbine tower 1 is a space truss structure welded from high-strength steel pipes. The top flange of the tower is fastened to the inner ring of the slewing bearing 2 via prestressed bolts. The short cylindrical section 3 is made of Q345B steel plate rolled and welded. Its lower flange is connected to the outer ring of the slewing bearing 2, and its upper flange is assembled and machined with the bottom plate of the lower platform 4 in the factory to ensure the flatness and verticality of the connection surface, forming a rigid "transition-load-bearing" module.

[0042] The main load-bearing beam 5 is designed as a frustum-shaped hollow box structure with a smaller front end and a larger rear end. Finite element topology optimization is used to achieve a balance between lightweight and high stiffness. Double lugs are welded to the rear end of the beam. The installation process of the omnidirectional elastic vibration damping support structure is as follows: First, the hinge connector 10 is fixed to the prefabricated reinforcing base of the lower platform 4 with high-strength bolts. Then, two rubber bushings 11 are pressed into the lug holes at the rear end of the main load-bearing beam 5. Finally, the beam is hoisted into position, aligning the lug holes with the pins of the hinge connector 10 and completing the assembly to form a rear flexible hinge. At the front, according to the calculated position, the first rubber pad 12a and the left and right lateral rubber pads 12b are bonded and fixed on the lower platform 4, and adjustable upper limiting baffles 13a and lateral limiting baffles 13b are installed to maintain the designed gap with the beam.

[0043] The hub 8 is cast from ductile iron QT400-18, and undergoes stress-relief annealing and precision machining. The pitch and connecting bearing 18 is a specially made double-row angular contact ball bearing, with flanges on both its inner and outer rings. During installation, the bases of the two sets of high-precision linear guideways are first installed on the machined surfaces of the upper / lower surfaces at the front end of the main load-bearing beam 5 and the inner wall of the center hole of the hub 8, respectively, ensuring the parallelism of all guideways. Then, the inner ring flange of the bearing is connected to the slider of the first set of guideways, and the outer ring flange is connected to the slider of the second set of guideways. The three blades 9 are installed on the hub 8 through the root flange and the blade root slewing bearing 22 (single-row four-point contact ball bearing). The three sets of hinged linkage mechanisms 21 adopt a two-force member design, with both ends hinged by spherical plain bearings, and are respectively connected to the lugs of the outer ring of the bearing and the connecting shaft at the blade root. The cylinder body of the hydraulic cylinder 20 is fixed to the upper part of the main load-bearing beam 5 by a high-strength bracket, and the end of its piston rod is connected to the connecting block on the side of the inner ring of the pitch and connecting bearing 18 through a flange.

[0044] The rotary transmission main shaft 6 is a 42CrMo alloy steel forging, heat-treated, and non-contactly installed within the main load-bearing beam 5, ensuring free rotation and preventing the main load-bearing beam 5 from transmitting bending moments to it. The front end of the main shaft is connected to the sun gear output shaft of the first-stage planetary speed increaser 14 via an interference fit, and the rear end is connected to the input gear of the second-stage bevel gear speed increaser 15 via a spline. The planet carrier at the input end of the first-stage planetary speed increaser 14 is rigidly connected to the side end face of the hub 8 via bolts, and its output sun gear is connected to the input shaft of the second-stage bevel gear speed increaser 15 via the rotary transmission main shaft 6. The output shaft (vertically upward) of the second-stage bevel gear speed increaser 15 is connected to the input shaft of the third-stage bevel gear speed increaser 16 via another set of drum-shaped gear couplings. The output shaft of the third-stage bevel gear speed increaser 16 returns to a horizontal direction and is connected to the input shaft of the generator 17 via a diaphragm coupling. The generator 17 is a permanent magnet synchronous generator, mounted on the lower platform 4 near the tower centerline via vibration damping pads.

[0045] The integrated mounting bracket of the hub-integrated mechanical brake mechanism 23 is made of cast steel and is fixed to the front end face of the main load-bearing beam 5 by high-strength bolts evenly distributed around its circumference. The brake drum is made of high-strength gray cast iron and is fastened to the annular rib plate on the inner wall of the hub 8 by bolts. The brake shoe assembly 7, S-type camshaft 30, brake hydraulic drive cylinder 28, adjusting arm 29 with integrated worm gear and worm, and return spring assembly 31 are all precision assembled on this integrated mounting bracket. The absolute encoder integrated on the adjusting arm 29 is used to monitor the camshaft rotation angle.

[0046] Workflow: Power generation: Wind drives blades 9, which in turn drive hub 8 to rotate. The torque is increased in three stages through a first-stage planetary speed increaser 14, a rotary transmission main shaft 6, and second- and third-stage bevel gear speed increasers (15, 16), before driving generator 17 to generate electricity.

[0047] Load bearing: Wind loads, etc., are transmitted to the main load-bearing beam 5 through the hub 8 and the bearing 32 connecting the beam and the hub. After being buffered by the rear hinge and the front rubber pad, they are transmitted to the tower foundation.

[0048] Pitch control: The control system controls the hydraulic station according to the wind speed signal, drives the hydraulic cylinder 20 to move, pushes the pitch and connecting bearing 18 to slide axially, and drives all blades to rotate synchronously to the optimal pitch angle through the hinge linkage mechanism 21.

[0049] Braking: When a stop or emergency braking is required, the hydraulic system drives the brake hydraulic drive cylinder 28, which pushes the adjusting arm 29, causing the S-shaped camshaft 30 to rotate and open the brake shoes, thus clamping the brake drum to achieve braking. After wear, the automatic clearance compensation mechanism will activate.

[0050] Example 2: Gear-synchronous belt hybrid transmission beam-shaft fan The only difference between this embodiment and Embodiment 1 is the third-stage speed-increasing mechanism. Its main structure and connection method are the same as in Embodiment 1.

[0051] The difference lies in the elimination of the three-stage bevel gear speed increaser 16. The vertical upper output shaft of the two-stage bevel gear speed increaser 15 directly drives the three-stage synchronous belt drive pulley 24. The three-stage synchronous belt drive pulley 24 is made of aluminum alloy and has rounded teeth. The three-stage synchronous belt 25 is a synchronous belt with a polyurethane-coated steel wire rope core. The three-stage synchronous belt driven pulley 26 is mounted on the input shaft of the generator 17. The tension wheel of the automatic tensioning device 27, under the action of a spring, always presses against the non-toothed surface of the synchronous belt 25, maintaining a constant tension. The generator 17 is also installed in a low position.

[0052] This solution is particularly suitable for applications that are sensitive to the weight and noise of the transmission system, or that seek lower maintenance costs, such as distributed wind power and island power supply.

[0053] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A beam-axle fan characterized by, include: Wind turbine tower (1); A yaw system installed at the top of the wind turbine tower (1); The lower platform (4) is installed on top of the wind turbine tower (1) via the yaw system. The main load-bearing beam (5) has its axis coaxial with the wind turbine rotation axis and is a fixed, non-rotating load-bearing component. Its rear end is connected to the lower platform (4) through a universal elastic vibration damping support structure. The hub (8) is rotatably connected to the front end of the main load-bearing beam (5) via a pitch and connecting bearing (18) and at least two sets of slide rails (19); the inner ring of the pitch and connecting bearing (18) is connected to the main load-bearing beam (5) via the first set of slide rails (19), and its outer ring is connected to the hub (8) via the second set of slide rails (19), so that the pitch and connecting bearing (18) is constrained to slide only along the axial direction of the main load-bearing beam (5); Multiple blades (9), the root of each blade (9) is mounted on the hub (8) by a blade root slewing bearing (22) and connected to the outer ring of the pitch and connecting bearing (18) by a hinge linkage mechanism (21); The integrated pitch mechanism includes a hydraulic cylinder (20) fixedly installed on the main load-bearing beam (5), and the piston rod of the hydraulic cylinder (20) is connected to the inner ring of the pitch and connecting bearing (18); The rotary transmission spindle (6) passes through the interior of the main load-bearing beam (5) and is independent of the main load-bearing beam (5) in terms of mechanical structure and force path; The three-stage speed-increasing transmission system includes a first-stage planetary speed-increasing machine (14), a second-stage bevel gear speed-increasing machine (15), and a third-stage speed-increasing mechanism connected in series. The housing of the first-stage planetary speed-increasing machine (14) is fixedly connected to the hub (8), and its output end is connected to the front end of the rotary transmission main shaft (6). The output end of the third-stage speed-increasing mechanism is connected to a generator (17). The hub-integrated mechanical brake mechanism (23) includes an integrated mounting bracket fixed to the front end of the main load-bearing beam (5) and extending into the hub (8), and a brake drum fixed to the inner wall of the hub (8).

2. The beam-spindle fan of claim 1 wherein, The yaw system includes a slewing bearing (2) and a short cylindrical section (3); the inner ring of the slewing bearing (2) is fixedly connected to the top of the wind turbine tower (1), and its outer ring is fixedly connected to the bottom of the short cylindrical section (3); the top of the short cylindrical section (3) is welded to the bottom surface of the lower platform (4) as a whole.

3. The beam-spindle fan of claim 1 wherein, The universal elastic vibration damping support structure includes a rear hinge vibration damping module and a front buffer limiting module; the rear hinge vibration damping module includes a hinge connector (10) fixed to the lower platform (4) and a rubber bushing (11) set on the pin of the hinge connector (10), and the rear end of the main load-bearing beam (5) is flexibly hinged to the hinge connector (10) through the rubber bushing (11); the front buffer limiting module includes a first rubber pad (12a) set below the front of the main load-bearing beam (5), an upper limiting baffle (13a) set above the front of the main load-bearing beam (5), and lateral rubber pads (12b) and lateral limiting baffles (13b) symmetrically set on the left and right sides of the front of the main load-bearing beam (5).

4. The beam-spindle fan of claim 1 wherein, The third-stage speed-increasing mechanism is a three-stage bevel gear speed-increasing machine (16), whose input end is connected to the output end of the second-stage bevel gear speed-increasing machine (15), and whose output end is connected to the input shaft of the generator (17); the second-stage bevel gear speed-increasing machine (15) and the third-stage bevel gear speed-increasing machine (16) work together to achieve two orthogonal 90° power reversals, so that the input axis of the generator (17) is parallel to the axis of the rotary transmission main shaft (6) and offset upward.

5. The beam-spindle fan of claim 1 wherein, The third-stage speed-increasing mechanism is a synchronous belt drive assembly, which includes: a third-stage synchronous belt drive pulley (24) fixed to the output end of the second-stage bevel gear speed increaser (15), a third-stage synchronous belt driven pulley (26) fixed to the input shaft of the generator (17), an arc-tooth synchronous belt (25) meshing with the drive pulley (24) and the driven pulley (26), and an automatic tensioning device (27) acting on the outside of the synchronous belt (25).

6. The beam spindle blower of claim 1 wherein, The hub-integrated mechanical brake mechanism (23) also includes: Two brake shoe assemblies (7) are symmetrically arranged inside the brake drum, with their lower ends hinged to the integrated mounting bracket and their upper ends provided with rollers; An S-shaped camshaft (30) is rotatably mounted on the integrated mounting bracket, the outline of which contacts the roller at the upper end of the brake shoe assembly (7); An adjusting arm (29) is fixedly connected to one end of the S-shaped camshaft (30), and a worm gear mechanism for automatically compensating for the wear gap of the friction plate is integrated inside it; A brake hydraulic drive cylinder (28) has its cylinder body fixed on the integrated mounting bracket, and its piston rod is hinged to the adjusting arm (29); A return spring assembly (31) is connected between the brake shoe assembly (7) and the integrated mounting bracket.

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