CN215486390U

CN215486390U - On-line monitoring wind driven generator variable pitch bearing bolt device

Info

Publication number: CN215486390U
Application number: CN202121494584.4U
Authority: CN
Inventors: 商宏伟; 杨斌
Original assignee: Shenyang Jidi'an Wind Power Technology Co ltd
Current assignee: Shenyang Jidi'an Wind Power Technology Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2022-01-11
Anticipated expiration: 2031-07-02

Abstract

A pitch bearing bolt device of an on-line monitoring wind driven generator relates to a monitoring wind driven generator component device, and the device comprises a support frame (1), a thread pair (2), a feeding bolt (3), a connecting bolt (4), a small nut (5), a cover plate (6), a contact piece (7), a tested bolt (8), a permanent magnet piece (9), a rotating plate (10) and a large nut (11); the magnetic sensor is arranged on the side surface of the outer sleeve, the positioning sleeve is sleeved in the outer sleeve and positioned by the side surface of a hexagon nut of the bolt, the outer sleeve is in threaded connection with the base, the base is adhered to a corresponding bearing surface connected with the bolt, the permanent magnet sheet is adsorbed on the top end of the nut of the bolt, and the S pole of the permanent magnet sheet is opposite to the magnetic sensor; the signal processor comprises a wire or wireless signal transmission functional module. The utility model realizes the on-line monitoring of the variable-pitch bearing bolt of the wind driven generator, finds the fault bolt in time and gives an alarm when the bolt has faults such as looseness or fracture, and reduces the risk of major faults of the wind driven generator.

Description

On-line monitoring wind driven generator variable pitch bearing bolt device

Technical Field

The utility model relates to a monitoring wind driven generator device, in particular to an on-line monitoring wind driven generator variable pitch bearing bolt device.

Background

The variable-pitch bearing bolt is used as an important connecting part on the wind driven generator, and because the variable-pitch bearing bolt is influenced by external impact, vibration, high temperature and the like, the bolt connecting part can be loosened, separated, broken or even dropped, so that the safety and the service performance of the structure are influenced, and even the variable-pitch bearing is damaged to cause disastrous results. Especially for some wind driven generators working in severe environment, the safety degree and fatigue damage are often difficult to directly judge, or the tightness is often neglected. In order to avoid accident consequences caused by failure of the variable-pitch bearing bolt, the variable-pitch bearing bolt is subjected to online state monitoring, so that the effects of reducing the accident rate and preventing major accidents can be achieved.

In the prior art, the traditional method for detecting the bolt is to periodically check the connecting bolt to check whether the bolt has angular displacement or not, and if so, the bolt must be pre-tightened again. However, the wind power generator blade is located at an altitude of more than several tens of meters, the work of the wind power generator must be stopped besides the high cost of regular inspection and the risk of personal safety, and in addition, the manual inspection also has inspection results which are different from person to person, and the accuracy and the reliability of the inspection results are difficult to ensure. The bolt on-line monitoring in the prior art comprises the following steps: piezoelectric impedance techniques, image processing, empirical mode decomposition techniques, and the like.

Disclosure of Invention

The utility model aims to provide a variable-pitch bearing bolt device for on-line monitoring of a wind driven generator.

The purpose of the utility model is realized by the following technical scheme:

a device for monitoring a variable-pitch bearing bolt of a wind driven generator on line comprises a support frame, a thread pair, a feeding bolt, a connecting bolt, a small nut, a cover plate, a contact piece, a tested bolt, a permanent magnet piece, a rotating plate and a large nut; the magnetic sensor is arranged on the side surface of the outer sleeve, the positioning sleeve is sleeved in the outer sleeve and positioned by the side surface of a hexagon nut of the bolt, the outer sleeve is in threaded connection with the base, the base is adhered to a corresponding bearing surface connected with the bolt, the permanent magnet sheet is adsorbed on the top end of the nut of the bolt, and the S pole of the permanent magnet sheet is opposite to the magnetic sensor; the signal processor comprises a wire or wireless signal transmission functional module.

According to the device for monitoring the pitch bearing bolt of the wind driven generator on line, the magnetic induction devices are connected in parallel.

According to the bolt device for the pitch bearing of the on-line monitoring wind driven generator, the Hall element is welded on the circuit board and is installed on the bottom plate.

According to the device for monitoring the variable-pitch bearing bolt of the wind driven generator on line, the induction distance between the Hall element and the magnetic sheet is 5-7.5 mm.

According to the device for monitoring the variable-pitch bearing bolt of the wind driven generator on line, the induction distance of the pin type Hall element to the magnetic field of the magnetic sheet is 17.5mm furthest.

According to the pitch bearing bolt device for the on-line monitoring wind driven generator, the induction distance of the surface-mounted Hall element to the magnetic field of the magnetic sheet is 10mm furthest.

The utility model has the advantages and effects that:

1. the magnetic sensor adopts a Hall magnetic sensor which is an electronic element based on Hall effect and can detect the surrounding magnetic field and the change thereof, and the magnetic sensor has the working characteristics that: when the magnetic field around the sensor is weak or does not exist, the internal circuit of the Hall element is conducted; when the magnetic field around the sensor becomes strong, the internal circuit of the hall element is disconnected. The length-magnetized strip-shaped magnetic sheet is adsorbed to the top end of a nut of the bolt, so that the S pole sensed by the Hall element is close to the magnetic sensor. The magnetic sensor and the magnetic sheet on the nut are correspondingly arranged on the side surface of the bolt and the nut and are 7-10mm away from the magnetic sheet. And monitoring the rotation displacement change of the magnetic sheet at the top of the bolt by using a magnetic sensor. When the bolt becomes flexible or breaks, the bolt can take place to revolve or drop, and the magnetic sheet on the nut also rotates certain angle or drops along with the bolt equally, and at this moment, will note the magnetic field change condition of magnetic sheet according to magnetic force sensor to judge whether the bolt breaks down.

2. The utility model realizes the on-line monitoring of the variable-pitch bearing bolt of the wind driven generator, when the bolt has faults such as looseness or fracture, the fault bolt is found in time, an alarm is sent out, and the fault position of the variable-pitch bearing bolt is sent to a related operation and maintenance technician, so that the reliability of the variable-pitch bearing bolt link can be ensured, the accidents such as blade falling caused by the looseness or fracture of the variable-pitch bearing bolt can be avoided, and the risk of major faults of the wind driven generator can be reduced.

Drawings

FIG. 1 is a cross-sectional view of an on-line bolt monitoring device according to the present invention;

FIG. 2 is a top view of the bolt on-line monitoring device of the present invention;

FIG. 3 is an isometric view of an on-line bolt monitoring apparatus of the present invention;

FIG. 4 is a partially enlarged view of the bolt on-line monitoring device of the present invention;

FIG. 5 is a three-dimensional view of a laboratory bench according to the present invention;

FIG. 6 is a two-dimensional view of the experimental table of the present invention;

FIG. 7 is a chart of the experimental completion markers of the present invention;

FIG. 8 is a Hall magnetic sensor module of the present invention;

FIG. 9 shows details of the integrated wires and sensor module of the present invention.

The components in the figure: the device comprises a support frame 1, a thread pair 2, a feeding bolt 3, a connecting bolt 4, a small nut 5, a cover plate 6, a contact piece 7, a tested bolt 8, a permanent magnet piece 9, a rotating plate 10 and a large nut 11.

Detailed Description

The present invention will be described in detail with reference to the embodiments shown in the drawings.

The utility model utilizes the magnetic sensor to monitor the displacement condition of the permanent magnet sheet on the bolt, thereby judging whether the bolt has faults. The device comprises a support frame 1, a thread pair 2, a feeding bolt 3, a connecting bolt 4, a small nut 5 which can be an M12 nut, a cover plate 6, a contact piece 7, a tested bolt 8, a permanent magnet piece 9, a rotating plate 10 and a large nut 11 which can be an M24 nut. Magnetic force sensor installs outside sleeve side, and the locating sleeve cover is in outside sleeve, leans on the hexagon nut side location of bolt, and outside sleeve adopts threaded connection with the base, and the base glues on the bolted connection' S that corresponds bearing surface, and the permanent magnetism piece adsorbs on the nut top of bolt, is relative with magnetic force sensor with the S utmost point of permanent magnetism piece. The outer sleeve, the positioning sleeve and the base are made of non-magnetic materials, and the signal processor comprises a wired or wireless signal transmission functional module.

Examples

(1) Pushing the lower layer connecting body to enable the bolt to rotate by a certain angle; rotating anticlockwise until the magnetic induction switch is switched off, the indicator light is turned off, and the rotation position is calibrated to be a switching-off position and recorded as a switching-off position

(ii) a Then, the lower-layer connecting body is rotated clockwise until the magnetic induction switch is closed again, the indicating lamp is lightened, and the rotation position is calibrated to be a rotary closing position and recorded as

。

(2) Re-fixing the magnetic induction switch to increase the distance between the switch and the permanent magnet by 5mm, and repeating the above experiment to obtain the open position and the rotary closed position

、

。

(3) And (3) repeating the steps (1) and (2) until the indicator light is not turned on any more or the rotation cannot enable the switch to be closed.

(4) And (3) replacing permanent magnet sheets with different types, selecting the side surface adjacent to the previous calibration reference surface on the nut as a new reference surface, and repeating the steps (1), (2) and (3) to respectively obtain a corresponding open position and a corresponding rotary closed position. This is done once.

The actual operation steps in the experimental process are shown in fig. 5 and 6.

The method comprises the following steps of respectively carrying out a plurality of groups of tests on the magnetizing magnetic sheets with two sizes and models by using pin type and patch type Hall elements, wherein the test results are as follows:

5 pieces of thickness magnetization magnetic sheet are to SMD hall element response experimental data:

the 6 thickness magnetizing magnetic sheets are used for sensing experimental data of the surface mount type Hall element:

the induction experiment data of the 7-piece thickness magnetizing magnetic sheet on the surface mount type Hall element are as follows:

the induction experiment data of 8 magnetized magnetic sheets with the thickness to the surface mounted Hall element are as follows:

the induction experiment data of the 9 thickness magnetizing magnetic sheets to the surface mount type Hall element are as follows:

10 pieces of thickness magnetization magnetic sheets are to SMD Hall component response experimental data:

identification

The data of (a) is relatively stable test data.

It can be seen from the experimental data summary table that as the number of magnetic sheets increases, the magnetic field is strengthened, the magnetic force increases, and the induction distance increases. The induction effect is best at the position of 5-7.5 mm.

Length magnetic sheet that magnetizes is to pin formula hall element response experimental data:

experiments show that Hall elements of different models correspond to magnetic sheets of different sizes and models, the stable sensing distance is kept at a close position, namely 5-7.5mm, and the excessively close distance causes a larger difference in the angle sensing of the Hall elements for the rotation of each bolt due to the looseness; too far distance can lead to the magnetic field intensity of magnetic sheet weak, be not enough to trigger hall element and report to the police.

The experimental data show that the pin type Hall element reacts more sensitively to the magnetic field of the magnetic sheet, the induction distance is long, and the farthest induction distance can reach 17.5 mm; the chip Hall element has relatively weak reaction to the magnetic field of the magnetic sheet, and the induction distance is 10mm at the maximum.

The 12 magnetic induction devices are connected in parallel, and the Hall element welded on the circuit board is pressed flat and installed on the base plate designed before. Because the magnetic force induction position of each induction device is different, each device can be tested only one by one. The result shows that when the bolt loosens and rotates, each device can normally induce the change of the magnetic force, thereby proving that the monitoring device is effective and feasible.

Claims

1. The device for monitoring the pitch bearing bolt of the wind driven generator on line is characterized by comprising a support frame (1), a thread pair (2), a feeding bolt (3), a connecting bolt (4), a small nut (5), a cover plate (6), a contact piece (7), a tested bolt (8), a permanent magnet piece (9), a rotating plate (10) and a large nut (11); the magnetic sensor is arranged on the side surface of the outer sleeve, the positioning sleeve is sleeved in the outer sleeve and positioned by the side surface of a hexagon nut of the bolt, the outer sleeve is in threaded connection with the base, the base is adhered to a corresponding bearing surface connected with the bolt, the permanent magnet sheet is adsorbed on the top end of the nut of the bolt, and the S pole of the permanent magnet sheet is opposite to the magnetic sensor; the signal processor comprises a wire or wireless signal transmission functional module.

2. The on-line monitoring wind turbine pitch bearing bolt device of claim 1, wherein the magnetic sensors are arranged in parallel with each other.

3. The on-line monitoring wind driven generator pitch bearing bolt device according to claim 1, wherein the magnetic sensor is a Hall magnetic sensor.