A safety braking device for a dual-set parallel axial flow fan coupling

Abstract

This invention discloses a safety braking device for a dual-set parallel axial flow fan coupling. It includes a braking base, a braking drive unit, and a rotation lifting braking unit. The braking base and braking drive unit are located below the coupling. The upper end of the rotation lifting braking unit has a braking groove on its braking contact surface, which is located below the rotating shaft of the coupling. An elastic braking unit is located within the braking groove. The advantages of this invention are: the braking drive unit drives the rotation lifting braking unit, combined with the elastic braking unit and the connecting shaft, creating an elastic friction contact design. This makes the contact between the braking device and the rotating shaft more compact during braking, resulting in smoother, safer, and more reliable braking. The elastic braking unit is wear-resistant, easy to disassemble and replace, and has low maintenance costs. This invention is equipped with remote and local modes. The remote mode allows for real-time monitoring of the braking device's operating status, while the local mode allows inspection personnel to quickly operate the braking device as needed.

Description

Technical Field

[0001] This invention relates to the field of power generation equipment technology in thermal power plants, and more specifically, to a safety braking device for a coupling of a dual-set parallel axial flow fan. Background Technology

[0002] The twin-set parallel axial flow fans in thermal power plants are important auxiliary equipment. Their operation primarily utilizes the rotation of the impeller to draw gas axially into the impeller from the inlet. The propellant on the impeller blades increases the gas's energy, directing it into the guide vanes. The guide vanes deflect the airflow, converting it into axial flow, and simultaneously guide the gas into the diffuser, further converting the gas's kinetic energy into pressure energy, before finally introducing it into the working pipeline. The operational performance of the twin-set parallel axial flow fans directly affects the safe, stable, and economical operation of the unit.

[0003] When a single side of the dual parallel axial flow fans in a power plant is under maintenance, it is necessary to brake them promptly when the fan shaft stops rotating. However, due to the possibility of the fan outlet damper not closing tightly, airflow backflow can easily occur. After the rotor of the coupling stops operating, the pushing force generated by the backflowing airflow from behind the damper acts on the fan blades, causing the rotor to reverse. When the rotor is in reverse, braking becomes risky, ineffective, and can easily burn out the motor. Therefore, a braking device needs to be added below the coupling to quickly activate the braking device and put it into the production system to brake when the rotor is close to stopping, thus assisting in stopping the coupling's rotation.

[0004] Currently, most power plants use traditional braking devices, which involve placing a rectangular sleeper under the coupling, temporarily fixing one end of the sleeper against the platform pipe, and using the lifting lugs above the motor to fix a hand chain hoist. The chain passing through the hand chain hoist is then attached to the other end of the sleeper. Finally, on-site personnel pull the chain to raise the sleeper to the position of the coupling with the fixed end as the fulcrum. By continuing to pull the sleeper upward, the friction between the sleeper and the coupling completely stops the rotation of the two sets of parallel axial flow fans.

[0005] Traditional braking methods that rely on the friction between sleepers and couplings using hand-operated hoists have many drawbacks. The braking method is crude; the sleepers use pipes as temporary fulcrums, making them prone to slippage during lifting, resulting in poor reliability. During braking, the sleepers may be thrown off, damaging fans, motors, or other equipment, and endangering the safety of on-site personnel. When installing and operating the braking components, on-site personnel must work around the operating equipment, placing them close to the coupling. Furthermore, the friction between the sleepers and coupling generates a large amount of sawdust, and prolonged friction can cause excessive heat, leading to the sleepers burning or breaking, potentially causing accidental injury to personnel. This method is high-risk and poses significant safety hazards. Additionally, the hand-operated hoist chain is prone to jamming due to the oblique tension on the sleepers, causing unnecessary equipment damage.

[0006] Therefore, there is a need for a new type of braking device for dual-group parallel axial flow fan couplings that is structurally sound, safe and reliable, easy to operate, and conforms to production standards. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the above-mentioned braking operation methods of parallel axial flow fan couplings, and to provide a simple, reliable and convenient safety braking device for parallel axial flow fan couplings.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A safety braking device for a dual-set parallel axial flow fan coupling includes a braking base, a braking drive unit, and a rotation lifting braking unit. The braking base and the braking drive unit are located below the coupling. The upper end of the rotation lifting braking unit has a braking groove on its braking contact surface. The braking groove is located below the rotating shaft of the coupling. A spring-loaded braking part is provided in the braking groove. The spring-loaded braking part prevents the rotating shaft from making hard contact with the braking groove. The braking drive unit drives the rotation lifting braking part to rotate upward on the braking base until the spring-loaded braking part in the braking groove of the rotation lifting braking part contacts the rotating shaft of the coupling, thereby realizing the braking operation of the rotating shaft of the coupling.

[0009] Furthermore, the brake base includes a brake rotation connection part and a swing support part. The rotating end of the rotating lifting brake part is mounted on the brake rotation connection part through a rotation connection component. The rotating lifting brake part rotates on the brake rotation connection part through the rotation connection component. The lifting end of the rotating lifting brake part is rotatably connected to the brake drive arm of the brake drive part through a transmission link. The brake drive part drives the brake drive arm to rotate and lifts the rotating lifting brake part upward through the transmission link. The lifting end of the rotating lifting brake part abuts against the support end of the swing support part. The support end of the swing support part supports the rotating lifting brake part after it has been lowered and reset.

[0010] Furthermore, the brake drive unit is equipped with a mode switching knob, an output control knob, and an opening degree display. The mode switching knob controls the switching between remote and local modes. When the mode switching knob is switched to local mode, the output control knob adjusts the driving torque of the brake drive unit. The opening degree display shows the rotation degree of the brake drive arm, allowing ground inspection personnel to intuitively understand the working status of the brake drive unit.

[0011] Preferably, the elastic braking unit includes an elastic braking base plate, an elastic braking support component, and a brake pad. The elastic braking base plate is installed in the braking groove, and the elastic braking support component is disposed between the elastic braking base plate and the braking groove. The lower end face of the brake pad is provided with a positioning protrusion, and the mounting end face of the elastic braking base plate is provided with a positioning hole. The brake pad is attached to the elastic braking base plate by combining the positioning protrusion and the positioning hole. The brake pad is fastened to the elastic braking base plate by locking components around it.

[0012] Preferably, the elastic brake base plate is installed in the brake groove via a connecting component. A locking groove is formed on the upper surface of the elastic brake base plate, and an elastic limiting groove is formed on the lower surface of the elastic brake base plate at a position corresponding to the locking groove. A locking connecting hole is formed on the connecting end face of the brake groove, and an elastic support groove is formed on the locking connecting hole. The lower end of the elastic brake support component is disposed in the elastic support groove, and the upper end of the elastic brake support component is engaged in the elastic limiting groove. The connecting cap of the connecting component is disposed in the locking groove, and the locking part of the connecting component passes through the middle of the elastic brake support component and is installed in the locking connecting hole.

[0013] Preferably, the brake pad includes a brake friction layer, a heat insulation layer, a shock absorption layer, and an adhesive layer, wherein the adhesive layer is attached to the mounting end face of the elastic brake base plate.

[0014] Preferably, the brake pad has locking through holes at its four corners, and the brake pad is fixedly mounted on the elastic brake base plate by installing locking components on the locking through holes.

[0015] Preferably, the elastic braking support component is a rectangular spring, which further improves the support strength of the elastic braking support component.

[0016] Preferably, the maximum lifting angle of the rotary lifting brake is less than or equal to 45°, and the maximum rotation angle of the brake drive arm is less than or equal to 90°, to ensure the structural safety of the rotary lifting brake and to ensure that the rotary lifting brake will not damage the coupling due to excessive lifting.

[0017] A support crossbar is provided between the brake rotation connection and the swing support. The support crossbar provides sufficient support force to the brake rotation connection and the swing support, so that the brake rotation connection can remain stable when the rotation lifting brake brake brake brake brakes the rotation coupling.

[0018] Preferably, the support end of the swing support portion is provided with a concave support arc surface, and a buffer pad is provided inside the concave support arc surface.

[0019] Preferably, a descent support sensing unit is provided on the inner side of the concave support arc surface. The descent support sensing unit is connected and communicates with the brake drive unit. After the descent support sensing unit detects that the rotating lifting brake unit is in contact with the concave support arc surface, it controls the brake drive unit to stop its operation.

[0020] Preferably, the lower connecting ring of the transmission link is rotatably mounted on the connecting shaft of the brake drive arm via a rotary bearing, and the upper connecting ring of the transmission link is rotatably mounted on the connecting shaft of the lifting end of the rotary lifting brake unit via a rotary bearing. The brake drive arm is inclined downwards, thereby increasing the lifting force supplied to the rotary lifting brake unit via the transmission link.

[0021] Compared with the prior art, the gain effect of the present invention is: Compared to the traditional method of using a manual hoist to lift a large sleeper to brake the coupling, this invention uses a method that directly fixes itself below the coupling. When braking is needed, it can be operated directly without waiting for the equipment to be set up. Furthermore, because it is pre-set, there is no need for manual construction around the operating equipment, which better meets production safety requirements and provides greater protection for the personal safety of construction workers.

[0022] This invention uses a braking drive unit to rotate and lift the braking unit to brake the rotating coupling, which changes the traditional method of using sleepers for braking. It eliminates the need for sleepers, making it more environmentally friendly. It also solves the problems of heat generation and sawdust splashing caused by the contact and friction between sleepers and couplings, thus better protecting the production workshop environment and the safety of on-site personnel.

[0023] The elastic braking part of this invention makes elastic friction contact with the connecting shaft, which avoids the problem of rigid contact between the sleeper and the coupling in traditional systems. This avoids damage to the coupling caused by rigid contact, achieves ideal braking effect, and effectively protects the coupling. Furthermore, the elastic braking part has the advantages of wear resistance, easy replacement, long service life, and can be directly disassembled and replaced after a certain wear, resulting in low maintenance cost and convenient maintenance.

[0024] This invention employs a braking drive unit connected to a rotating lifting braking unit with a spring-loaded braking component to achieve remotely controlled braking operation on the coupling shaft of the connector fan. No on-site operator is required; the torque is pre-set based on parameters such as fan model, speed, and coupling dimensions. Real-time monitoring of braking parameters ensures a more stable braking process. Remote control also allows for timely detection and response to torque overload during braking, better protecting the braking mechanism and coupling and ensuring safety during braking. Furthermore, this invention can switch to local operation at any time in case of remote operation failure, increasing the reliability of the braking device.

[0025] This invention also provides multiple braking modes, including remote and local modes, allowing selection of the appropriate braking mode based on different braking requirements to achieve a safe and reliable braking effect. This invention can adjust the braking drive unit to select the most suitable braking torque according to the braking requirements of different wind turbine models, effectively braking the wind turbine by rotating and raising the braking unit. It is applicable to braking operations of wind turbines with different couplings, thus having a wider range of applications. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the action structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the control and display structure of the braking drive unit of the present invention.

[0029] Figure 4 This is a schematic diagram of the elastic braking unit of the present invention.

[0030] Figure 5 This is an enlarged schematic diagram of part A of the present invention.

[0031] Figure 6 This is a schematic diagram of the brake pad structure of the present invention.

[0032] Explanation of the attached drawing numbers: Brake base-1, brake drive unit-2, rotating lifting brake unit-3, brake groove-4, elastic brake unit-5, transmission link-6, connecting component-7, support crossbar-8, brake rotation connection unit-11, swing support unit-12, brake drive arm-21, mode switching knob-22, output control knob-23, opening display unit-24, locking connection hole-41, elastic support groove-42, elastic brake base plate-51, elastic brake support component-52, brake pad-53, positioning protrusion-54, positioning hole-55, locking groove-56, elastic limit groove-57, brake friction layer-531, heat insulation layer-532, shock absorption layer-533, adhesive layer-534, locking through hole-535, upper connecting ring-61, lower connecting ring-62, connecting cap-71, locking part-72. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] To enable the review committee to have a better understanding of the purpose, features, and functions of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings: Figure 1-6The accompanying drawings illustrate the present invention, which is a safety braking device for a dual-set parallel axial flow fan coupling. The device includes a braking base 1, a braking drive unit 2, and a rotation lifting braking unit 3. The braking base 1 and the braking drive unit 2 are located below the coupling. The upper end of the rotation lifting braking unit 3 has a braking groove 4 on its braking contact surface. The braking groove 4 is located below the rotating shaft of the coupling. A spring-loaded braking part 5 is provided within the braking groove 4. The spring-loaded braking part 5 prevents the rotating shaft from making hard contact with the braking groove 4. The braking drive unit 2 drives the rotation lifting braking unit 3 to rotate upwards on the braking base 1 until the spring-loaded braking part 5 within the braking groove 4 of the rotation lifting braking unit 3 contacts the rotating shaft of the coupling, thus achieving braking operation on the rotating shaft of the coupling.

[0036] Furthermore, the brake drive unit 2 may optionally employ a servo motor.

[0037] Furthermore, the brake base 1 includes a brake rotation connection part 11 and a swing support part 12. The rotating end of the rotating lifting brake part 3 is mounted on the brake rotation connection part 11 through a rotation connection component. The rotating lifting brake part 3 rotates on the brake rotation connection part 11 through the rotation connection component. The lifting end of the rotating lifting brake part 3 is rotatably connected to the brake drive arm 21 of the brake drive part 2 through a transmission link 6. The brake drive part 2 drives the brake drive arm 21 to rotate, and lifts the rotating lifting brake part 3 upward through the transmission link 6. The lifting end of the rotating lifting brake part 3 abuts against the support end of the swing support part 12, and the support end of the swing support part 12 supports the rotating lifting brake part 3 after it has been lowered and reset.

[0038] Furthermore, the brake drive unit 2 is equipped with a mode switching knob 22, an output control knob 23, and an opening degree display unit 24. The mode switching knob 22 is responsible for controlling the switching between remote mode and local mode. When the mode switching knob 22 is switched to local mode, the output control knob 23 is responsible for adjusting the driving torque of the brake drive unit 2. The opening degree display unit 24 is responsible for displaying the rotation opening of the brake drive arm 21 of the brake drive unit 2, allowing ground inspection personnel to intuitively grasp the working status of the brake drive unit 2. When the brake drive unit 2 malfunctions, the opening degree display unit 24 can also display a fault signal, allowing ground inspection personnel to more quickly understand the fault problem of the brake drive unit 2.

[0039] Preferably, the elastic braking part 5 includes an elastic braking base plate 51, an elastic braking support component 52, and a brake pad 53. The elastic braking base plate 51 is installed in the braking groove 4. The elastic braking support component 52 is disposed between the elastic braking base plate 51 and the braking groove 4. The lower end face of the brake pad 53 is provided with a positioning protrusion 54. The upper mounting end face of the elastic braking base plate 51 is provided with a positioning hole 55. The brake pad 53 is attached to the elastic braking base plate 51 by combining the positioning protrusion 54 and the positioning hole 55. The brake pad 53 is fastened to the elastic braking base plate 51 by locking components around the perimeter.

[0040] Preferably, the elastic brake base plate 51 is installed in the brake groove 4 via the connecting component 7. The upper end face of the elastic brake base plate 51 has a locking groove 56, and the lower end face of the elastic brake base plate 51 has an elastic limiting groove 57 at a position corresponding to the locking groove 56. The connecting end face of the brake groove 4 has a locking connecting hole 41, and an elastic support groove 42 is formed in the locking connecting hole 41. The lower end of the elastic brake support component 52 is disposed in the elastic support groove 42, and the upper end of the elastic brake support component 52 is engaged in the elastic limiting groove 57. The connecting cap 71 of the connecting component 7 is disposed in the locking groove 56, and the locking part 72 of the connecting component 7 passes through the middle of the elastic brake support component 52 and is installed in the locking connecting hole 41.

[0041] Preferably, the brake pad 53 includes a braking friction layer 531, a heat insulation layer 532, a shock-absorbing layer 533, and an adhesive layer 534. The adhesive layer 534 is attached to the mounting end face of the elastic brake base plate 51. The braking friction layer 531 ensures that the coupling is stably braked during braking, and also extends the service life of the brake pad 53. The heat insulation layer 532 effectively reduces the heat generated by friction during braking and protects the elastic brake base plate 51 from overheating. The shock-absorbing layer 533 can absorb some of the collision stress when the elastic brake part 5 contacts the coupling, reducing the compressive stress that the elastic brake support component 52 needs to withstand. The adhesive layer 534 can temporarily attach the brake pad 53 to the elastic brake base plate 51, facilitating subsequent locking and fixing operations of the brake pad 53.

[0042] Preferably, the brake pad 53 is provided with locking through holes 535 at its four corners, and the brake pad 53 is fixedly installed on the elastic brake base plate 51 by installing locking components on the locking through holes 535.

[0043] Preferably, the elastic braking support component 52 is a rectangular spring, which further improves the support strength of the elastic braking support component 52.

[0044] Preferably, the maximum lifting angle of the rotary lifting brake 3 is less than or equal to 45°, and the maximum rotation angle of the brake drive arm 21 is less than or equal to 90°, ensuring the structural safety of the rotary lifting brake and preventing damage to the coupling due to excessive lifting. A support crossbar 8 is provided between the brake rotary connection 11 and the swing support 12, providing sufficient support force to both the brake rotary connection 11 and the swing support 12, ensuring the stability of the brake rotary connection 11 when the rotary lifting brake 3 brakes the rotary coupling.

[0045] Preferably, the support end of the swing support part 12 is provided with a concave support arc surface 13, and a buffer pad 14 is provided in the concave support arc surface 13.

[0046] Preferably, a descent support sensing part 15 is provided on the inner side of the concave support arc surface 13. The descent support sensing part 15 is connected and communicates with the brake drive part 2. After the descent support sensing part 15 detects that the rotating lifting brake part 3 is in contact with the concave support arc surface 13, it controls the brake drive part 2 to stop continuing to operate.

[0047] Preferably, the lower connecting ring 62 of the transmission link 6 is rotatably mounted on the connecting shaft of the brake drive arm 21 via a rotary bearing, and the upper connecting ring 61 of the transmission link 6 is rotatably mounted on the connecting shaft of the lifting end of the rotary lifting brake part 3 via a rotary bearing. The brake drive arm 21 is inclined downwards, and the downwardly inclined brake drive arm 21 increases the lifting force given to the rotary lifting brake part 3 via the transmission link 6.

[0048] First embodiment: Before engaging the braking operation, the safety braking device of the dual-set parallel axial flow fan coupling needs to be set. Before the coupling starts working, according to the coupling specifications, wear-resistant brake pads 53 are installed in the brake groove 4, which has an elastic braking part 5. The brake drive part 2 is slowly operated through the main control system to set the travel of the rotating lifting brake part 3 and the brake drive arm 21 of the brake drive part 2. Then, the mode switching knob 22 is used to switch to local mode first. The lifting torque of the brake drive part 2 is set according to the needs using the output control knob 23. After the lifting torque of the brake drive part 2 is set, the mode switching knob 22 is used to switch to remote mode. The braking setting of the safety braking device of the dual-set parallel axial flow fan coupling is completed.

[0049] Second embodiment: When braking is required on the rotating shaft of a slowly rotating coupling, the safety braking device for the dual-set parallel axial flow fan coupling is activated after the related equipment stops operating. A servo motor is used as the braking drive unit 2. The braking drive unit 2 operates according to a pre-set lifting torque, driving the braking drive arm 21 to rotate upwards. Through the transmission link 6 connected between the braking drive arm 21 and the lifting end of the rotating lifting brake unit 3, the rotating lifting brake unit 3 rotates along the braking rotating connection part 11, slowly lifting until the elastic brake part 5 in the braking groove 4 contacts the surface of the rotating shaft. Then, the braking drive unit 2 slowly increases the lifting force, causing the elastic brake part 5 to slowly press against the surface of the rotating shaft, performing gentle braking. During the slow pressing of the elastic brake part 5 against the surface of the rotating shaft, the brake pads... The brake pad 53 rubs against the surface of the rotating shaft, and the thrust of the rotating shaft surface on the elastic brake part 5 causes the elastic brake base plate 51 to push against the brake groove 4. The elastic brake support member 52 provided between the elastic brake base plate 51 and the brake groove 4 provides elastic brake support force to the elastic brake part 5, so that the brake pad 53 and the surface of the rotating shaft maintain stable frictional contact. When the lifting force of the brake drive part 2 reaches the maximum preset value, the brake drive part 2 stops increasing the lifting force and keeps the elastic brake part 5 in stable contact with the rotating shaft. During the braking process, the elastic brake part 5 slowly and smoothly brakes the rotating shaft, eventually stopping the rotating shaft from rotating.

[0050] After the safety braking device of the dual-set parallel axial flow fan coupling completes the braking operation on the slow-speed coupling, the brake drive unit 2 controls the brake drive arm 21 to reset, and the transmission link 6 drives the rotating lifting brake unit 3 to descend and reset. The rotating lifting brake unit 3 descends to the concave support arc surface 13 of the swing support unit 12. The buffer pad 14 on the concave support arc surface 13 prevents the rotating lifting brake unit 3 from colliding hard with the swing support unit 12 during descent, thus avoiding damage to the equipment. Furthermore, the descent support sensing unit 15 controls the brake drive unit 2 to stop the rotating lifting brake unit 3 after it contacts the concave support arc surface 13, further ensuring the safety of the resetting operation of the rotating lifting brake unit 3.

[0051] Through the remote mode of the brake drive unit 2, operators can remotely monitor the safety braking device of the dual-set parallel axial flow fan coupling from the control room. The remote mode sends the status of the brake drive unit 2 to the central control system in real time, so that operators can always keep track of the operating parameters and status of the safety braking device of the dual-set parallel axial flow fan coupling.

[0052] When the brake drive unit 2 experiences torque overload, the remote mode will send a fault signal to the central control system and simultaneously display the fault signal on the opening display unit 24.

[0053] When the remote mode of the brake drive unit 2 fails, ground inspection personnel can switch the brake drive unit 2 from the remote mode back to the local mode by operating the brake drive unit 2, thereby realizing manual control of the brake drive unit 2.

[0054] Third embodiment: This embodiment is similar to the first embodiment, except that this embodiment uses a point-touch braking mode to effectively brake the coupling.

[0055] When it is necessary to brake the rotating shaft of the coupling that is rotating at medium speed, the safety braking device of the dual-set parallel axial flow fan coupling is activated after the related equipment of the coupling stops running, using a point-contact braking mode. A servo motor is used as the braking drive unit 2. The braking drive unit 2 operates according to a preset lifting torque, and the braking drive unit 2 drives the braking drive arm 21 to rotate up and down in an orderly manner. The brake drive unit 2 rotates the brake drive arm 21 upwards. Through the transmission link 6 connecting the brake drive arm 21 and the lifting end of the rotating lifting brake unit 3, the rotating lifting brake unit 3 rotates slowly along the brake rotating connection 11 until the elastic brake unit 5 in the brake groove 4 contacts the surface of the rotating shaft. A point-pressure contact is formed between the elastic brake unit 5 and the rotating shaft surface. After a preset contact time, the brake drive unit 2 reverses, causing the rotating lifting brake unit 3 to descend and separate from the rotating shaft surface. After a preset separation time, the brake drive unit 2 reverses again, raising the rotating lifting brake unit 3 until the elastic brake unit 5 in the brake groove 4 contacts the rotating shaft surface again, forming a point-pressure contact until the contact reaches the preset contact time and separates the elastic brake unit 5 from the rotating shaft surface. This point-pressure braking operation is repeated multiple times until the braking operation on the rotating shaft is complete, causing the rotating shaft to stop completely.

[0056] After the safety braking device of the dual-group parallel axial flow fan coupling completes the braking operation on the slow coupling, the brake drive unit 2 controls the brake drive arm 21 to reset, and the transmission link 6 drives the rotation to lift the brake unit 3 to lower and reset.

[0057] Fourth embodiment: This embodiment is similar to the first embodiment, except that this embodiment uses a point-contact combined with slow-fit braking mode to effectively brake the coupling.

[0058] When it is urgent to brake the rotating shaft of a coupling that is rotating at a high speed, after the relevant equipment of the coupling stops running, activate the safety braking device of the dual-set parallel axial flow fan coupling, and first use the point-contact braking mode. A servo motor is used as the brake drive unit 2. The brake drive unit 2 operates according to a preset lifting torque. The operation of the brake drive unit 2 drives the brake drive arm 21 to rotate upward. Through the transmission link 6 connected between the brake drive arm 21 and the lifting end of the rotating lifting brake unit 3, the rotating lifting brake unit 3 rotates along the brake rotating connection part 11 and slowly lifts until the elastic brake part 5 in the brake groove 4 contacts the surface of the rotating shaft. The elastic brake part 5 forms a point pressure contact with the surface of the rotating shaft. After the contact reaches the preset point contact time, the brake drive unit 2 reverses, causing the rotating lifting brake unit 3 to descend until it separates from the surface of the rotating shaft. After the preset separation time is reached, the brake drive unit 2 reverses again, and the rotating lifting brake unit 3 is brought back into contact with the elastic brake part 5 in the brake groove 4 until the elastic brake part 5 forms a point pressure contact with the surface of the rotating shaft again. This process continues until the contact reaches the preset point contact time and the elastic brake part 5 separates from the surface of the rotating shaft. Repeating the above-mentioned point-contact braking operation multiple times reduces the rotational speed of the rotating shaft until it reaches the preset value for slow contact braking. At this point, the safety braking device of the dual-set parallel axial flow fan coupling automatically switches to the slow contact braking mode. The brake drive unit 2 actuates to drive the rotating lifting brake unit 3 to slowly lift until the elastic brake unit 5 in the brake groove 4 contacts the surface of the rotating shaft. Subsequently, the brake drive unit 2 slowly increases the lifting force, causing the elastic brake unit 5 to slowly press against the surface of the rotating shaft for gentle braking. During the slow pressing process of the elastic brake unit 5 against the surface of the rotating shaft, the brake pad 53 rubs against the surface of the rotating shaft. The friction and the thrust of the rotating shaft surface on the elastic brake part 5 cause the elastic brake base plate 51 to press against the brake groove 4. The elastic brake support member 52 provided between the elastic brake base plate 51 and the brake groove 4 provides elastic brake support force to the elastic brake part 5, so that the brake pad 53 maintains stable frictional contact with the rotating shaft surface. When the lifting force of the brake drive part 2 reaches the maximum preset value, the brake drive part 2 stops increasing the lifting force and keeps the elastic brake part 5 in stable contact with the rotating shaft. During the braking process, the elastic brake part 5 slowly and smoothly brakes the rotating shaft, eventually stopping the rotating shaft from rotating.

[0059] When the brake pad 53 wears to the critical line, simply unscrew the locking components in the locking through holes 535 at the four corners of the brake pad 53 when the equipment is stopped, remove the old brake pad 53, align the positioning protrusion 54 of the new brake pad 53 with the positioning hole 55 of the elastic brake base plate 51, and then lock the brake pad 53 onto the elastic brake base plate 51 using the locking components to complete the replacement of the brake pad 53.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A safety braking device for a double set parallel shaft axial flow fan coupling, characterized by: The coupling includes a brake base (1), a brake drive unit (2), and a rotation lifting brake unit (3). The brake base (1) and the brake drive unit (2) are located below the coupling. The upper end of the rotation lifting brake unit (3) has a brake groove (4) on its brake contact surface. The brake groove (4) is located below the rotating shaft of the coupling. The brake groove (4) contains a spring brake unit (5). The brake base (1) includes a brake rotation connection unit (11) and a swing support unit (12). The rotating end of the rotation lifting brake unit (3) is mounted on the brake rotation connection unit (11) via a rotation connection component. The lifting end of the moving part (3) is rotatably connected to the brake drive arm (21) of the brake drive part (2) via the transmission link (6). The lifting end of the rotating lifting brake part (3) abuts against the support end of the swing support part (12). The brake drive part (2) is provided with a mode switching knob (22), an output control knob (23) and an opening display part (24). The lifting angle of the rotating lifting brake part (3) is less than or equal to 45°, and the rotation angle of the brake drive arm (21) is less than or equal to 90°. A support crossbar (8) is provided between the brake rotating connection part (11) and the swing support part (12).

2. The safety braking device for a dual-set parallel axial flow fan coupling according to claim 1, characterized in that: The elastic braking unit (5) includes an elastic braking base plate (51), an elastic braking support component (52), and a brake pad (53). The elastic braking base plate (51) is installed in the braking groove (4). The elastic braking support component (52) is disposed between the elastic braking base plate (51) and the braking groove (4). The lower end face of the brake pad (53) is provided with a positioning protrusion (54). The upper mounting end face of the elastic braking base plate (51) is provided with a positioning hole (55). The brake pad (53) is attached to the elastic braking base plate (51) by combining the positioning protrusion (54) and the positioning hole (55). The brake pad (53) is fastened to the elastic braking base plate (51) by locking components around it.

3. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 2, characterized in that: The elastic brake base plate (51) is installed in the brake groove (4) through the connecting component (7). The upper end face of the elastic brake base plate (51) has a locking groove (56). The lower end face of the elastic brake base plate (51) has an elastic limiting groove (57) at the position corresponding to the locking groove (56). The connecting end face of the brake groove (4) has a locking connecting hole (41). The locking connecting hole (41) has an elastic support groove (42). The lower end of the elastic brake support component (52) is set in the elastic support groove (42). The upper end of the elastic brake support component (52) is locked in the elastic limiting groove (57). The connecting cap (71) of the connecting component (7) is set in the locking groove (56). The locking part (72) of the connecting component (7) passes through the middle of the elastic brake support component (52) and is installed in the locking connecting hole (41).

4. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 2, characterized in that: The brake pad (53) includes a brake friction layer (531), a heat insulation layer (532), a shock absorption layer (533), and an adhesive layer (534), wherein the adhesive layer (534) is attached to the mounting end face on the elastic brake base plate (51).

5. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 2, characterized in that: The brake pad (53) has locking through holes (535) at its four corners. The brake pad (53) is fixedly installed on the elastic brake base plate (51) by installing locking components on the locking through holes (535).

6. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 2, characterized in that: The elastic braking support component (52) is a rectangular spring.

7. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 1, characterized in that: The swing support part (12) has a concave support arc surface (13) on its support end, and a buffer pad (14) is provided inside the concave support arc surface (13).

8. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 7, characterized in that: The inner side of the concave support arc surface (13) is provided with a descent support sensing part (15), which is connected and communicates with the brake drive part (2).

9. A safety braking device for a dual-set parallel axial flow fan coupling according to claim 1, characterized in that: The lower connecting ring (62) of the transmission link (6) is rotatably mounted on the connecting shaft of the brake drive arm (21) via a rotating bearing, and the upper connecting ring (61) of the transmission link (6) is rotatably mounted on the connecting shaft of the lifting end of the rotating lifting brake part (3) via a rotating bearing. The brake drive arm (21) is arranged to be tilted downwards.

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