Fan self-weight mechanical lock

Abstract

The utility model discloses a kind of self-weight mechanical locks for fan, it is related to fan locking technical field, including the frame of being fixed on base, protective net, mechanical locking assembly and be used for driving fan blade rotation pulley, the bottom of the protective net with the frame is detachably connected, the top of the frame is provided with base, the mechanical lock assembly is slidably supported in the top of the base, and positioning plate is provided on the protective net, the positioning plate with the bottom end of the mechanical lock assembly is abutted, the pulley is movably connected with the frame by main shaft.The utility model uses the mechanical locking device of mechanical locking assembly and protective net linkage, simple structure, convenient to install, reliable in use.Dismantling pulley and other components is not needed when overhauling and installing, it is easy to operate, without considering centering requirement, fan can be locked while overhauling and dismantling protective net, ensure the safety of operator, and after maintenance is completed, it can be reset quickly, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine locking technology, and in particular to a self-weight mechanical lock for wind turbines. Background Technology

[0002] When maintaining, repairing, or cleaning air-cooled fans, it is essential to ensure that the power system is shut off and the drive source is isolated. Even after the power system is shut off, the fan may continue to rotate due to natural wind or airflow generated by adjacent fans. Therefore, reliable mechanical locking of the rotating parts is crucial, along with double safety measures, to prevent personal injury or equipment accidents caused by accidental rotation. During equipment maintenance, if operators approach the equipment, the drive system must be locked. Without reliable safety measures, belt-driven systems can be extremely dangerous and cause serious injury. Therefore, there is an urgent need to address the rotation issue of air-cooled fans during shutdown to prevent blade rotation and ensure operator safety.

[0003] Existing air-cooled fans include an air-cooled fan shaft, a fan shaft support structure, fan blades, pulleys, etc. The fan shaft support structure is used to support and fix the entire air-cooled fan, and it is fixed to the air-cooled fan and will not rotate with the air-cooled fan shaft. The fan blades are fixed on the air-cooled fan shaft, and the rotation of the air-cooled fan shaft drives the fan blades to rotate. The air-cooled fan blades are relatively long, and the blade structure determines that they can withstand a large amount of wind force. During the fan shutdown, to prevent the fan blades from rotating, maintenance personnel generally use temporary locking devices to prevent the fan from rotating. When the fan is restarted, the temporary device is removed. The temporary device is complex to install and remove and is inconvenient. If the operator forgets to remove the temporary locking device, it will cause damage to the fan components. Existing fan locking devices include manual direct-entry type and hydraulic drive type, which have high alignment requirements, are labor-intensive to operate, have complex structures, and are costly. Patent CN202091130U discloses a wind turbine locking device, which includes a base, a mechanical pin, and a rocker arm. The base has a seat hole, and the mechanical pin is disposed in the seat hole, with its front end corresponding to the positioning hole of the main shaft positioning plate. A support is provided on the base, and one end of the rocker arm is connected to the support, while the end of the mechanical pin is connected to the middle of the rocker arm. A lever mechanism is installed at the rear of the mechanical pin, allowing one person to complete the locking and unlocking actions of the main shaft by turning the rocker arm. Although this device is simple in structure, flexible in operation, stable and reliable, and does not require a power source, in actual wind turbine installation and maintenance, this device requires an additional positioning plate at the main shaft. Furthermore, the alignment requirements between the mechanical pin and the positioning hole of the main shaft positioning plate are high during locking, requiring manual operation steps to achieve this function. After maintenance, manual resetting is also required.

[0004] Based on the above problems, it is necessary to develop a mechanical locking device that is linked with the safety protection net. This device does not require alignment and adopts a simpler structural form to achieve the functions of safe locking after the wind turbine stops and rapid reset after maintenance work is completed. This is also a problem that needs to be solved in the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a self-weight mechanical lock for wind turbines. This mechanical lock is linked to the protective net. The mechanical locking assembly can lock the wind turbine while the protective net is being inspected and disassembled, ensuring the safety of operators. Furthermore, it can be quickly reset after maintenance, improving work efficiency.

[0006] To achieve the above objectives, this utility model provides a self-weight mechanical lock for wind turbines, including a frame fixed on a base, a protective net, a mechanical locking assembly, and a pulley for driving the wind turbine blades to rotate. The protective net is detachably connected to the bottom of the frame, and a base is provided on the top of the frame. The mechanical locking assembly is slidably supported on the top of the base, and a positioning plate is provided on the protective net. The positioning plate abuts against the bottom end of the mechanical locking assembly, and the pulley is movably connected to the frame through a main shaft.

[0007] Preferably, the base includes a base plate, a first guide tube and a second guide tube, the first guide tube and the second guide tube are welded to the base plate in a vertical direction, the base plate is provided with a connecting hole, the base plate is fixedly connected to the frame by bolts, and the base plate is provided with a through hole that matches the inner diameter of the first guide tube and the second guide tube.

[0008] Preferably, the mechanical locking assembly includes a connecting rod, a locking rod, and a positioning pin. The connecting rod has a long cylindrical rod and a short cylindrical rod at both ends. One end of the long cylindrical rod passes through the inner diameter of the first guide tube and abuts against the positioning plate. One end of the locking rod is fixedly connected to the bottom end of the short cylindrical rod, and the other end is fixedly connected to the positioning pin.

[0009] Preferably, the short cylindrical rod passes through the inner diameter of the second guide tube, the bottom end of the short cylindrical rod is provided with a knife groove and a thread, and the locking rod is provided with a slot hole, the size of the slot hole matching the knife groove, and the bottom end of the short cylindrical rod passes through the slot hole and is fixedly connected by a nut.

[0010] Preferably, two positioning plates are provided. The positioning plates are fixedly clamped on the upper and lower sides of the protective net, and the center of the positioning plate intersects the axis of the first guide tube in the vertical direction to ensure that the bottom end of the long cylindrical rod abuts against the positioning plate.

[0011] Preferably, the inner diameter of the first guide tube is in clearance fit with the long cylindrical rod, the inner diameter of the second guide tube is in clearance fit with the short cylindrical rod, and the inner diameter of the second guide tube is larger than the inner diameter of the first guide tube.

[0012] Preferably, the protective net is connected to the bottom of the frame by bolts. When the fan is stopped for maintenance and the protective net is removed, the long cylindrical rod loses its fulcrum, and the connecting rod falls along the base, ensuring that the positioning pin on the locking rod is inserted into the middle hole of the pulley, thereby locking the pulley and restricting the fan rotation.

[0013] Therefore, the self-weight mechanical lock for wind turbines with the above-mentioned structure has the following advantages compared with the prior art: The mechanical lock in this utility model has a simple structure, is easy to install, and is reliable in use; its mechanical locking components prevent the equipment from starting under abnormal conditions, protecting technicians from injury during maintenance; it does not require disassembling pulleys and other parts during installation, and the wind turbine can be locked while the protective net is being removed for maintenance, making it easy to operate; after maintenance, the wind turbine can be restored to normal working condition by installing the protective net, without the need for additional maintenance, and no centering operation is required when the mechanical lock is locked. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the self-weight mechanical lock for wind turbines of this utility model; Figure 2 This is a top view of an embodiment of the self-weight mechanical lock for wind turbines according to this utility model; Figure 3 This is a schematic diagram of the structure of the mechanical lock falling when the protective net is open, according to an embodiment of the self-weight mechanical lock for wind turbines of this utility model. Figure 4 This is a schematic diagram of the mechanical locking assembly structure of an embodiment of the self-weight mechanical lock for wind turbines of this utility model.

[0015] Figure label: 1. Frame; 2. Protective net; 3. Mechanical locking assembly; 31. Connecting rod; 3101. Long cylindrical rod; 3102. Short cylindrical rod; 32. Locking rod; 33. Positioning pin; 4. Base; 41. Base plate; 42. First guide tube; 43. Second guide tube; 5. Positioning plate; 6. Pulley; 7. Main shaft; 8. Bolt; 9. Nut. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0017] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Example like Figures 1-4 As shown, this utility model provides a self-weight mechanical lock for a wind turbine, including a frame 1 fixed on a base, a protective net 2, a mechanical locking assembly 3, and a pulley 6 for driving the wind turbine blades to rotate. The protective net 2 is detachably connected to the bottom of the frame 1, and a base 4 is provided on the top of the frame 1. The mechanical locking assembly is slidably supported on the top of the base 4, and a positioning plate 5 is provided on the protective net 2. The positioning plate 5 abuts against the bottom end of the mechanical locking assembly. The base 4 includes a base plate 41, a first guide tube 42, and a second guide tube 43. The first guide tube 42 and the second guide tube 43 are welded to the base plate 41 in the vertical direction, respectively. The base plate 41 is provided with a connecting hole. The base plate 41 is fixedly connected to the frame 1 by bolts 8. The base plate 41 is provided with a through hole that matches the inner diameter of the first guide tube 42 and the second guide tube 43, so that the mechanical locking assembly 3 can slide on the base 4. Two positioning plates 5 are provided, which are fixedly clamped on the upper and lower sides of the protective net 2. The center of the positioning plate 5 intersects the axis of the first guide tube in the vertical direction, ensuring that the bottom end of the long cylindrical rod 3101 abuts against the positioning plate 5, and ensuring that the protective net 2 is in the closed state. See details. Figure 1 The positioning plate 5 can lift the mechanical locking assembly 3, which is inactive, and the pulley 6 is movably connected to the frame 1 through the main shaft 7.

[0019] like Figure 4As shown, in this embodiment, the mechanical locking assembly 3 includes a connecting rod 31, a locking rod 32, and a positioning pin 33. The connecting rod 31 has a long cylindrical rod 3101 and a short cylindrical rod 3102 at both ends. One end of the long cylindrical rod 3101 passes through the inner diameter of the first guide tube 42 and abuts against the positioning plate 5. One end of the locking rod 32 is fixedly connected to the bottom end of the short cylindrical rod 3102, and the other end is fixedly connected to the positioning pin 33. During installation, the short cylindrical rod 3102 passes through the inner diameter of the second guide tube 43. The inner diameter of the first guide tube 42 is in clearance fit with the long cylindrical rod 3101, and the inner diameter of the second guide tube 43 is in clearance fit with the short cylindrical rod 3102. The inner diameter of the second guide tube is larger than the inner diameter of the first guide tube. A groove and thread are provided at the bottom end of the short cylindrical rod 3102, and a slot is provided on the locking rod 32. The size of the slot matches the groove. The bottom end of the short cylindrical rod 3102 passes through the slot and is fixedly connected by a nut 9. The protective net 2 is connected to the bottom of the frame 1 by bolts 8. When the fan is stopped for maintenance and the protective net 2 is removed, the long cylindrical rod 3101 loses its fulcrum, and the connecting rod 31 falls along the base 4 under its own weight, ensuring that the positioning pin 33 on the locking rod 32 is inserted into the middle hole of the pulley 6, thereby locking the pulley 6 and restricting the rotation of the fan.

[0020] Its specific working principle is as follows: When the fan needs maintenance after shutdown, the staff must first remove the protective net 2 below the pulley 6, as detailed below. Figure 3 Because the long rod in the connecting rod 31 loses its fulcrum, the connecting rod 31 and the locking rod 32 in the entire mechanical locking assembly 3 fall due to their own weight, causing the positioning pin 33 on the locking rod 32 to insert into the hole in the middle of the spokes of the pulley 6, restricting the rotation of the pulley 6, thereby restricting the rotation of the fan. After the maintenance is completed, the staff only needs to install the protective net 2 under the pulley 6 into place, and lift the long rod in the connecting rod 31 through the positioning plate 5 on the protective net 2, thereby lifting the entire connecting rod 31 and the locking rod 32, so that the positioning pin 33 on the locking rod 32 rises to the top of the pulley 6, releasing the restriction on the rotation of the pulley 6, and restoring the normal working state of the fan to ensure that the fan can rotate.

[0021] Therefore, the mechanical locking device in this invention, which links the mechanical locking assembly with the protective net, has a simple structure, is easy to install, and is reliable in use. During maintenance and installation, there is no need to disassemble the pulleys and other components, making operation simple and eliminating the need to consider alignment requirements. The fan can be locked simultaneously with the removal of the protective net, ensuring the safety of operators. Furthermore, it can be quickly reset after maintenance, improving work efficiency.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A self-weight mechanical lock for a wind turbine, characterized in that: The device includes a frame fixed to a base, a protective net, a mechanical locking assembly, and a pulley for driving the wind turbine blades to rotate. The protective net is detachably connected to the bottom of the frame, and a base is provided on the top of the frame. The mechanical locking assembly is slidably supported on the top of the base, and a positioning plate is provided on the protective net. The positioning plate abuts against the bottom end of the mechanical locking assembly, and the pulley is movably connected to the frame via a main shaft.

2. The self-weight mechanical lock for wind turbines according to claim 1, characterized in that: The base includes a base plate, a first guide tube, and a second guide tube. The first guide tube and the second guide tube are welded to the base plate in a vertical direction. The base plate is provided with a connection hole. The base plate is fixedly connected to the frame by bolts. The base plate is provided with a through hole that matches the inner diameter of the first guide tube and the second guide tube.

3. The self-weight mechanical lock for a wind turbine according to claim 2, characterized in that: The mechanical locking assembly includes a connecting rod, a locking rod, and a positioning pin. The connecting rod has a long cylindrical rod and a short cylindrical rod at both ends. One end of the long cylindrical rod passes through the inner diameter of the first guide tube and abuts against the positioning plate. One end of the locking rod is fixedly connected to the bottom end of the short cylindrical rod, and the other end is fixedly connected to the positioning pin.

4. The self-weight mechanical lock for a wind turbine according to claim 3, characterized in that: The short cylindrical rod passes through the inner diameter of the second guide tube. The bottom end of the short cylindrical rod is provided with a knife groove and a thread. The locking rod is provided with a slot hole. The size of the slot hole matches the knife groove. The bottom end of the short cylindrical rod passes through the slot hole and is fixedly connected by a nut.

5. The self-weight mechanical lock for a wind turbine according to claim 4, characterized in that: Two positioning plates are provided. The positioning plates are fixedly clamped on the upper and lower sides of the protective net, and the center of the positioning plate intersects the axis of the first guide tube in the vertical direction to ensure that the bottom end of the long cylindrical rod abuts against the positioning plate.

6. The self-weight mechanical lock for wind turbines according to claim 5, characterized in that: The inner diameter of the first guide tube is in clearance fit with the long cylindrical rod, the inner diameter of the second guide tube is in clearance fit with the short cylindrical rod, and the inner diameter of the second guide tube is larger than the inner diameter of the first guide tube.

7. The self-weight mechanical lock for a wind turbine according to claim 6, characterized in that: The protective net is connected to the bottom of the frame by bolts. When the wind turbine is stopped for maintenance and the protective net is removed, the long cylindrical rod loses its fulcrum, and the connecting rod falls along the base, ensuring that the positioning pin on the locking rod is inserted into the middle hole of the pulley, thereby locking the pulley and restricting the rotation of the wind turbine.

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