阅读说明：本技术 一种风力发电机组的叶片防扫塔监测装置 (Tower monitoring devices is prevented sweeping by wind generating set's blade ) 是由 石宇峰 蒋祥增 刘坤 陈思范 邓顺城 何宇翔 魏煜锋 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种风力发电机组的叶片防扫塔监测装置,包括环形支撑件、旋转件、限位开关和一个可控制机组停机并发出报警信号的控制器；环形支撑件套装固定在风力发电机组的塔筒外壁上,且其安装位置处的塔筒高度对应于机组必须停机的净空距离；旋转件套装在塔筒外壁上,并位于环形支撑件上面,旋转件的外周均布有多根保护杆,保护杆的伸出长度即为必须停机的净空距离,旋转件底部沿其周向均布有多个用于触发限位开关的触发件,限位开关有一个安装在其中两个相邻的触发件之间,并通过电缆连接到控制器。本发明无需使用任何传感器,主要通过机械结构和电气原理来实现,可避免传统方法出现的传感器稳定性不高、一旦失效将导致重大事故的问题。(The invention discloses a blade anti-sweep tower monitoring device of a wind generating set, which comprises an annular supporting piece, a rotating piece, a limit switch and a controller, wherein the controller can control the unit to stop and send an alarm signal; the annular support piece is sleeved and fixed on the outer wall of a tower barrel of the wind generating set, and the height of the tower barrel at the installation position of the annular support piece corresponds to a clearance distance for stopping the wind generating set; the rotating part is sleeved on the outer wall of the tower cylinder and located on the annular supporting part, a plurality of protection rods are uniformly distributed on the periphery of the rotating part, the extending length of each protection rod is a clearance distance which needs to be stopped, a plurality of trigger parts used for triggering the limit switch are uniformly distributed on the bottom of the rotating part along the circumferential direction of the rotating part, and one limit switch is installed between two adjacent trigger parts and connected to the controller through a cable. The invention does not need to use any sensor, is mainly realized by a mechanical structure and an electrical principle, and can avoid the problems of low stability of the sensor and serious accidents caused by failure in the traditional method.)

1. The utility model provides a tower monitoring devices is prevented sweeping by wind generating set's blade which characterized in that: the wind generating set comprises an annular supporting piece, a rotating piece, a limit switch and a controller, wherein the controller can control the wind generating set to stop and send an alarm signal; the annular support piece is sleeved and fixed on the outer wall of a tower barrel of the wind generating set, and the height of the tower barrel at the installation position of the annular support piece corresponds to the clearance distance of the wind generating set which needs to be stopped, namely the minimum distance between the lower end of the blade and the outer wall of the tower barrel after the blade begins to bend and deform; the rotating member suit is on tower section of thick bamboo outer wall to be located annular support piece, the periphery equipartition of rotating member has many guard bars that outwards stretch out, just the clearance that must shut down is promptly for the extension length of guard bar, and when the guard bar received external force and promoted, when the guard bar was swept to the blade promptly, can drive the rotating member along tower section of thick bamboo outer wall free rotation, the bottom of rotating member has a plurality of triggers that are used for triggering limit switch along its circumference equipartition, trigger contacts along the rotation of rotating member and presses limit switch and realizes the trigger to limit switch, limit switch has one to install between wherein two adjacent triggers to through cable junction to the controller, the controller can realize shutting down in time and reporting to the police to wind generating set according to limit switch's the condition of triggering.

2. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1, wherein: the device comprises a tower barrel, a rotating piece, two fixed pulleys and two ropes, wherein the two fixed pulleys are arranged on the outer wall of the tower barrel and positioned above the rotating piece; wherein, the guard bar that two ropes are connected is different.

3. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1 or 2, wherein: the outermost end of the protective rod is designed into a single-side bevel edge structure, and the effect of reducing the stress of the blades when the blades sweep the protective rod is achieved.

4. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1, wherein: the rotating piece is formed by splicing two semicircles.

5. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1, wherein: the trigger piece is a lug.

6. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1, wherein: the limit switch is a limit switch of a normally closed contact.

7. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1 or 4, wherein: the rotating part is a plastic part or a glass fiber reinforced plastic part.

8. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1 or 2, wherein: the guard bar is a plastic piece or a glass fiber reinforced plastic piece.

9. The blade anti-sweep tower monitoring device of a wind generating set according to claim 1 or 5, wherein: the trigger part is a plastic part or a glass fiber reinforced plastic part.

Technical Field

The invention relates to the technical field of wind generating sets, in particular to a blade anti-sweep tower monitoring device of a wind generating set.

Background

With the development of a wind generating set in a large-scale direction, the blades are longer and longer, which means that the blades are softer and more flexible and have very large deformation, the blades are likely to sweep a tower barrel to bring danger in a rotating process, the blades are broken if the blades are light, and the tower barrel is broken if the blades are heavy, so that the minimum distance between the blades and the tower barrel, namely a clearance distance, needs to be monitored in real time, and when the clearance distance is smaller than or equal to 0, a blade tower sweeping accident occurs.

At present, the methods for measuring the clearance between the blade and the tower in the industry mainly include the following two methods: the method comprises the steps that a plurality of laser scanners are arranged on a tower barrel close to the lower blade tip of a blade along the radial direction by 360 degrees, the laser scanners repeatedly and horizontally scan, the minimum distance between the lower blade tip and the tower barrel is calculated by measuring the included angle and the distance between laser and the blade in real time, and when the minimum distance is lower than a certain threshold value, an alarm and a stop signal are sent out. The second method is that a distance measuring sensor is arranged on the engine room, the distance measuring sensor points to a certain angle fixedly, the distance from the sensor to the lower blade tip in a certain direction is measured in real time, whether the blade triggers a set limit value or not is monitored, a corresponding signal is transmitted to a control system, and the control system judges whether the machine needs to be stopped or not.

The above two methods have the following problems:

1. in the first method, a laser scanner belongs to a vulnerable part and is easily influenced by weather, such as rain, snow, sand and dust weather, so that the measurement is inaccurate; the service life is not long, and the replacement is required regularly.

2. In the second method, the distance measuring sensor also belongs to a quick-wear part, so that the distance measuring sensor is easy to break down or damage, the requirement on the installation angle is very high, and once the installation angle deviates, or in the operation process, the angular deviation caused by the loosening of the bolt can cause monitoring failure.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a safe and reliable blade anti-sweep tower monitoring device of a wind generating set, which is realized mainly through a mechanical structure and an electrical principle without using any sensor and can effectively avoid the problems of low stability of the sensor and serious accidents caused by failure in the traditional method.

In order to achieve the purpose, the technical scheme provided by the invention is as follows: a blade anti-sweep tower monitoring device of a wind generating set comprises an annular supporting piece, a rotating piece, a limit switch and a controller, wherein the controller can control the wind generating set to stop and send an alarm signal; the annular support piece is sleeved and fixed on the outer wall of a tower barrel of the wind generating set, and the height of the tower barrel at the installation position of the annular support piece corresponds to the clearance distance of the wind generating set which needs to be stopped, namely the minimum distance between the lower end of the blade and the outer wall of the tower barrel after the blade begins to bend and deform; the rotating member suit is on tower section of thick bamboo outer wall to be located annular support piece, the periphery equipartition of rotating member has many guard bars that outwards stretch out, just the clearance that must shut down is promptly for the extension length of guard bar, and when the guard bar received external force and promoted, when the guard bar was swept to the blade promptly, can drive the rotating member along tower section of thick bamboo outer wall free rotation, the bottom of rotating member has a plurality of triggers that are used for triggering limit switch along its circumference equipartition, trigger contacts along the rotation of rotating member and presses limit switch and realizes the trigger to limit switch, limit switch has one to install between wherein two adjacent triggers to through cable junction to the controller, the controller can realize shutting down in time and reporting to the police to wind generating set according to limit switch's the condition of triggering.

The device further comprises two fixed pulleys and two ropes, wherein the two fixed pulleys are arranged on the outer wall of the tower barrel and are positioned above the rotating piece, each fixed pulley is paired with one rope, one end of each rope is fixed on one protection rod, and the other end of each rope passes around the corresponding fixed pulley and then sags to the ground to be in a natural loose state, so that the protection rod is prevented from being tensioned by the rope and cannot rotate freely; wherein, the guard bar that two ropes are connected is different.

Furthermore, the outermost end of the protection rod is designed into a single-side bevel edge structure, so that the action of reducing the stress on the protection rod when the blade sweeps the protection rod is achieved.

Further, the rotating piece is formed by splicing two semicircles.

Further, the trigger is a bump.

Further, the limit switch is a limit switch of a normally closed contact.

Further, the rotating part is a plastic part or a glass fiber reinforced plastic part.

Furthermore, the protection rod is a plastic piece or a glass fiber reinforced plastic piece.

Further, the trigger part is a plastic part or a glass fiber reinforced plastic part.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. and no sensor is needed, so that the maintenance workload is reduced, and the cost is low.

2. The limit switch is adopted as a passive node, so that the reliability is very high, the condition of failure basically cannot occur, and the influence of any weather is avoided.

3. The normally closed node is used as a monitoring point, and when a cable is broken or a certain part is in poor contact, the shutdown can be triggered in time without passing any failure point.

4. The device is convenient to install, can be installed when the tower barrel is hoisted, and does not need extra installation cost.

5. The maintenance and the regular inspection are very convenient, and whether the device is in a normal state can be inspected at any time.

Drawings

Fig. 1 is an installation schematic diagram of a blade anti-sweep tower monitoring device.

Fig. 2 is a schematic view of the mounting of the support.

Fig. 3 is a schematic structural view of the rotating member.

Fig. 4 is a partial structural schematic diagram of the blade anti-sweep tower monitoring device.

FIG. 5 is a schematic view of the blade about to sweep to the guard bar.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Referring to fig. 1, the wind generating set mainly comprises a tower 1, blades 2, a hub 3 and a nacelle 4, wherein the blades 1 rotate under the action of wind power, and deform more and more with the increase of wind speed, and then gradually approach the tower 1.

Referring to fig. 1 to 5, the blade anti-tower-sweep monitoring device of the wind generating set provided by the embodiment includes an annular supporting member 11, a rotating member 8, a limit switch 5 with a normally closed contact, a controller 7 capable of controlling the wind generating set to stop and sending an alarm signal, two fixed pulleys 12 and two ropes 13; the annular support piece 11 is sleeved and fixed on the outer wall of the tower barrel 1, and the height H of the tower barrel 1 at the installation position of the annular support piece 11 corresponds to a clearance L that the wind generating set must stop, namely the minimum distance between the lower end of the blade 2 and the outer wall of the tower barrel 1 after the blade 2 begins to bend and deform; the rotating part 8 consists of two semicircles, the rotating part is integrally sleeved on the outer wall of the tower barrel 1 and is positioned above the annular supporting part 11, four protection rods 9 extending outwards are symmetrically arranged on the periphery of the rotating part 8, the extending length of each protection rod 9 is a clearance L which needs to be stopped, the clearance L is a last defense line of the blade 2 for preventing the tower from being swept, when the protection rods 9 are pushed by external force, namely when the blade 2 sweeps the protection rods 9, the rotating part 8 can be driven to freely rotate along the outer wall of the tower barrel, the resistance is very small, in addition, the outermost end of each protection rod 9 is designed into a single-side bevel edge structure, and the structure has the effect that when the blade 2 sweeps the protection rods 9, the stress of the blade 2 and the protection rods 9 is as small as possible; a plurality of trigger pieces 10 for triggering the limit switch 5 are uniformly distributed at the bottom of the rotating piece 8 along the circumferential direction of the rotating piece, in this embodiment, the trigger pieces 10 are specifically bumps, the limit switch 5 can be pressed along with the rotation of the rotating piece 8 to trigger the limit switch 5, the limit switch 5 is installed between two adjacent trigger pieces 10 and is connected to the controller 7 through a cable 6, and the controller 7 can realize the timely shutdown and alarm of the wind generating set according to the triggering condition of the limit switch 5; at the outer wall department of tower section of thick bamboo 1 above rotating member 8, fixed two fixed pulleys 12, every fixed pulley 12 pairs has a rope 13, the one end of rope 13 is fixed to a fender rod 9 (wherein, the fender rod 9 diverse that two ropes 13 are connected), the other end droops to ground after walking around fixed pulley 12, the rope is in the natural lax state, and there is enough allowance, avoid fender rod 9 taut and unable free rotation by rope 13, when leading to blade 2 to sweep fender rod 9, blade 2 and fender rod 9 are all destroyed.

The rotating member 8, the protection rod 9 and the trigger member 10 are all made of plastic or glass fiber reinforced plastic materials, and have high strength and light weight.

Since four guard bars 9 are mounted around the rotor 8, the blades 2 will sweep first up the guard bars 9, rather than directly up the tower 1, no matter in which direction the blades 2 are yawed with the nacelle 4.

When the clearance between blade 2 and the tower section of thick bamboo 1 diminishes gradually, lead to blade 2 to sweep guard bar 9, guard bar 9 drives rotating member 8 rotatory, rotating member 8 drives trigger 10 rotation again, when trigger 10 is rotatory, will trigger limit switch 5, limit switch 5 will become normally open by the normal close, when controller 7 detects limit switch 5 and becomes normally open by the normal close, in time shut down with the mode of shutting down of highest level, and send the too little warning of air-purifying, ensure wind generating set's safety.

Maintainer is learning behind the warning of headroom undersize, in time rush to the scene, inspection blade 2, guard bar 9, whether rotating member 8 is impaired, if impaired, in time repair, the reason of inspection headroom undersize simultaneously, under the condition of guaranteeing to start the machine safely, reset controller 7, if limit switch 5 triggers owing to the rotation in rotating member 8 later stage this moment, just be in between two trigger pieces 10, be in the normally closed state, can reset rapidly and start the machine, if limit switch 5 just is located trigger piece 10 department this moment, be in normally open state by trigger piece 10 pressing, then can manually stimulate one of them rope 13, let rotating member 8 rotatory, make limit switch 5 be located between two trigger pieces 10, be in the normally closed state promptly.

For avoiding monitoring devices to become invalid, should compile and examine the flow surely, stimulate rope 13 once every month, let rotating member 8 rotatory promptly, when a rope 13 can't make rotating member 8 rotatory, can stimulate another rope 13, whether the inspection trigger 10 can normally trigger limit switch 5, if can't, then need the inspection and be which link goes out the problem.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.