CN202362139U - Variable speed variable pitch bearing testing device of wind generating set - Google Patents

Abstract

The utility model provides a pitch bearing testing device for a wind power generating set, which comprises a base, a loading mechanism and a connecting mechanism. The base is provided with a hub for installing the bearing to be tested, and the hub is provided with a hub for driving the tested bearing. A pitch drive device for bearing rotation, the loading mechanism is connected to the tested bearing through the connecting mechanism, the connecting mechanism includes a connecting bracket and a connecting belt, the connecting bracket is fixed on the rotating ring of the tested bearing, One end of the connecting belt is connected to the connecting bracket, and the other end is connected to the loading mechanism. The utility model provides a pitch bearing testing device for wind power generating sets with simple installation, small floor space, ease of use and low cost, and is suitable for bearings of various sizes, without making matching flanges for bearings of different sizes.

Description

A wind turbine pitch bearing testing device

technical field

The utility model relates to wind power generation technology, in particular to a pitch bearing testing device for a wind power generating set.

Background technique

Modern large-scale wind turbines are mostly variable-speed and variable-pitch models. This type of model can adjust its own speed according to the wind speed to obtain higher output power before the unit reaches the rated speed. When the unit reaches the rated speed, it can be installed on the The pitch control system on the hub changes the pitch angle of the blades to ensure that the unit does not experience overspeed and overload. If the pitch control system fails, the unit will fail catastrophically due to the inability to adjust the pitch angle of the blades when the wind speed is high. Therefore, the pitch system is crucial to the safe operation of modern large-scale wind turbines.

At present, an electric pitch system is usually used in a wind turbine, which includes a pitch control cabinet, a pitch drive motor, a pitch reducer, a pitch drive gear and/or a toothed belt, and a pitch bearing. Among them, the pitch bearing is required to have a strong bearing capacity and high reliability due to the complex load conditions during operation. However, the existing pitch bearings basically adopt a double-row spherical roller structure, and there is a clearance between the rolling elements and the raceway, and the size of the clearance usually affects the friction coefficient and damping torque of the bearing, so it is necessary to carry out the clearance adjustment. Adjust to have zero or negative play. However, in the process of clearance adjustment, if the clearance adjustment is unreasonable, the bearing will not run smoothly, resulting in excessive damping torque, which will cause the bearing to rotate, and then cause the pitch drive motor to overheat and affect the reliability of the system. .

Because the pitch system is very important to the safe operation of the unit, before the pitch system is assembled, a pitch test is required to check whether the function of the pitch system is normal and whether the components meet the design requirements. However, since manufacturers of pitch bearings generally conduct bearing no-load tests before leaving the factory to check the clearance of pitch bearings, wind turbine manufacturers generally no longer conduct separate tests for pitch bearings. In this way, there are the following problems: 1. Generally, pitch bearing manufacturers only do no-load tests to check the bearing clearance, but it is unreasonable to use the bearing no-load clearance as the actual assembly clearance of the bearing, because in actual working conditions Bearings are subjected to axial forces, radial forces and overturning moments, and these loads have a great influence on bearing clearance and bearing friction coefficient. Second, if the pitch bearing is not loaded in the pitch system test, it is difficult to find the defective bearing, which will increase the probability of using the defective bearing in the pitch system of the wind turbine, thereby reducing the pitch system Reliability increases the potential safety hazards and maintenance costs and difficulties of wind turbines.

In order to solve the above problems, a Chinese patent application whose publication number is CN 101354313 titled "Testing method and test platform for wind turbine pitch bearings" provides a test platform for wind turbine pitch bearings, which includes a base , hubs, counterweight arms and counterweights. The characteristic of the pitch bearing test platform is that the bearing is loaded by the counterweight arm and the counterweight, so that it can check whether the clearance of the bearing under loading meets the requirements and whether the bearing is defective. However, this technology has the following disadvantages: first, the area occupied by the counterweight arm is too large, the manufacturing cost is high, and the installation, disassembly and adjustment of the counterweight arm are complicated, and auxiliary equipment must be used; Different mounting flanges are required for installation, which increases testing costs.

Utility model content

The utility model is dedicated to solving the above-mentioned problems existing in the prior art. Therefore, the utility model provides a pitch bearing test device of a wind power generating set, which is simple to install, occupies a small area, is easy to use, and has a low cost. And it is suitable for bearings of various sizes, and there is no need to make matching flanges for bearings of different sizes.

In order to solve the above-mentioned technical problems, the utility model provides a pitch bearing testing device for a wind power generating set, which includes a base, a loading mechanism and a connecting mechanism, the base is provided with a hub for installing the tested bearing, and the hub A pitch drive device for driving the tested bearing to rotate is provided. The loading mechanism is connected with the tested bearing through the connecting mechanism. The connecting mechanism includes a connecting bracket and a connecting belt, and the connecting bracket is fixed on the tested bearing. On the rotating ring of the bearing, one end of the connecting belt is connected to the connecting bracket, and the other end is connected to the loading mechanism.

Wherein, the connecting bracket includes two bearing connecting plates and at least one connecting rod, and the two bearing connecting plates are arranged on opposite sides of the rotating ring of the tested bearing.

Wherein, each bearing connecting plate is provided with a mounting hole and a connecting hole, the bearing connecting plate is fixed on the tested bearing through the mounting hole and a fastener, and the connecting rod passes through the connecting hole and the fastener It is fixed between the two bearing connecting plates.

Wherein, a loop is provided at one end of the connecting belt, and the connecting rod passes through the loop.

Wherein, the number of the loading mechanisms corresponds to the number of tested bearings.

Wherein, the loading mechanism includes a counterweight loading mechanism or an electric loading mechanism.

Wherein, the counterweight loading mechanism includes a vertical support, a counterweight and a lifting plate, the vertical support is provided with guide rails for the lifting plate to slide, and pulleys are provided at the top and bottom of the vertical support.

Wherein, the loading bracket is a vertical bracket with a symmetrical structure.

Wherein, the counterweight loading mechanism is connected with the connecting belt through the ring lug and the steel cable.

Wherein, the electric loading mechanism is connected with a reel, and the connection belt can be wound on the reel.

The utility model has the following effects:

The pitch bearing testing device of the wind power generating set provided by the utility model is provided with a connecting bracket on the bearing to be tested to connect the loading mechanism and the bearing to be tested through a connecting belt and transmit the pulling force, thereby applying a tangential force on the circumference of the pitch bearing. In order to realize the loading on the pitch bearing, compared with the prior art, the pitch bearing test device of the present invention connects the loading mechanism and the tested bearing through the connecting belt, so there is no need to make matching flanges for bearings of different sizes. Suitable for bearings of all sizes.

In a preferred embodiment of the utility model, the loading mechanism is an electric motor or a counterweight loading mechanism in which the counterweights are arranged vertically, thus making the pitch bearing test device of the wind power generating set provided by the utility model occupy a small area , easy to use and low cost.

Description of drawings

Fig. 1 is a schematic structural diagram of a pitch bearing testing device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a bearing connecting plate provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a connecting bracket provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of the connection between the bearing connecting plate and the tested bearing according to an embodiment of the present invention;

Fig. 5 is a front view of the loading mechanism provided by an embodiment of the utility model;

Fig. 6 is a side view of the loading mechanism provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the following is a detailed description of the pitch bearing testing device of the wind power generating set provided by the utility model in conjunction with the accompanying drawings.

Please refer to Fig. 1 to Fig. 6 together, the pitch bearing test device of the wind power generating set provided by an embodiment of the present invention includes a base (not shown), a loading mechanism 3 and a connecting mechanism, and the base is provided with a bearing for installing the tested bearing. 2, the hub 1 is provided with a pitch drive device for driving the tested bearing 2 to rotate in the hub 1, and the loading mechanism 3 is connected with the tested bearing 2 through a connecting mechanism. In this embodiment, the base, the hub 1 and the loading mechanism are all fixed on the ground, and three groups of tested bearings 2 are installed on the hub 1, and the three tested bearings 2 are symmetrically distributed at 120 degrees apart on the circumference, and correspond to Each tested bearing 2 is provided with a set of loading mechanism 3 respectively.

Wherein, the loading mechanism 3 includes a loading bracket 32 and a counterweight block group 33, the loading bracket 32 is a vertical bracket of a symmetrical structure, on which a pulley 31 and a guide rail 35 are arranged, and the counterweights are divided into two groups of symmetrical arrangements, and each group is equipped with Heavy all is equipped with the hoisting structure that is made up of lifting bolt 36, lifting plate 37, pull bar and counterweight fixed latch 34. The connection mechanism includes a connection bracket and a connection belt. The connection bracket is fixed on the rotating ring of the tested bearing 2. One end of the connection belt is connected to the connection bracket, and the other end is connected to the loading mechanism 3. The connection bracket includes two bearing connection plates 4 and at least one The connecting rod 42 is provided with a mounting hole 40 and a connecting hole 41 on the bearing connecting plate 4 .

During the test, first two bearing connecting plates 4 are respectively installed on the two end faces of the rotating ring of the tested bearing 2 through the mounting holes 40 and bolts; then the connecting rods 42 are passed through the connecting holes 41 and Connect the ring sleeve at one end of the belt, and fix the connecting rod 42 on the two bearing connecting plates 4 with nuts, the other end of the connecting belt is connected with two steel cables through the ring lug, and the other end of the steel cable is bypassed and installed on the loading bracket 32 in turn The pulleys 31 at the bottom and the top are respectively connected with the lifting bolts 36 of two groups of counterweights. During the pitch bearing test, the pitch motor drives the rotating ring of the tested bearing 2 to rotate through the transmission system. 33 can move up and down along the guide rail 35 of the loading bracket 32 so as to form the load acting on the bearing 2, wherein, the size of the load can be realized by changing the position of the fixing pin 34 so as to select the required counterweight weight.

The pitch bearing loading mechanism of this embodiment arranges the stroke of the counterweight in a vertical manner, so it occupies a small area, saves space, improves the site utilization rate of the production workshop, and facilitates batch configuration; and, the present embodiment provides The loading mechanism is easy to install, without excessive connection and fastening procedures, and without the use of lifting equipment, and the pitch bearing test device provided in this embodiment uses a connecting belt to connect and transmit tension. It is suitable for pitch bearings of different sizes without special production of matching mounting flanges.

It should be noted that in practical applications, the loading mechanism is not limited to the above-mentioned counterweight loading mechanism. For example, electric loading can be used, that is, the method of using a motor to drive the reel to wind the connecting belt and keep the connecting belt in a stable tension can also be used. To replace the counterweight, so as to achieve the effect of applying torque load to the tested bearing through the connecting belt. In addition, in practical applications, the load requirements exceeding the upper limit of a single set of loading mechanisms can be achieved by using two or more sets of loading mechanisms in parallel, and when more than two sets of loading mechanisms are used, the connecting bracket can include 2 For the above connecting rods, the connecting straps corresponding to each set of loading mechanisms can be respectively connected to different connecting rods, so that the loading mechanisms can apply loads respectively through the connecting straps.

In addition, it should be noted that although in this embodiment, three tested bearings are installed on the hub, in practical applications, only a single or two pitch bearings can be installed. At this time, only the One or two bearings to be tested can be equipped with loading mechanisms, that is, the number of loading mechanisms in the present invention corresponds to the number of bearings to be tested.

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (10)

1. A wind turbine pitch bearing testing device, comprising a base, a loading mechanism and a connecting mechanism, the base is provided with a wheel hub for installing the tested bearing, and the wheel hub is provided with a variable speed drive for driving the tested bearing to rotate Paddle driving device, the loading mechanism is connected to the tested bearing through the connecting mechanism, wherein the connecting mechanism includes a connecting bracket and a connecting belt, and the connecting bracket is fixed on the rotating ring of the tested bearing, One end of the connecting belt is connected to the connecting bracket, and the other end is connected to the loading mechanism. 2. The wind turbine pitch bearing testing device according to claim 1, wherein the connecting bracket comprises two bearing connecting plates and at least one connecting rod, and the two bearing connecting plates are arranged on the bearing to be tested. On the opposite side of the rotating ring, the connecting rod is fixed between two bearing connecting plates. 3. The pitch bearing testing device of wind power generating set as claimed in claim 1, characterized in that, each bearing connecting plate is provided with a mounting hole and a connecting hole, and the bearing connecting plate passes through the mounting hole and the fastener To be fixed on the bearing to be tested, the connecting rod is fixed between the two bearing connecting plates through the connecting hole and the fastener. 4 . The pitch bearing testing device of a wind power generating set according to claim 2 or 3 , wherein a ring is provided at one end of the connecting belt, and the connecting rod passes through the ring. 4 . 5. The pitch bearing testing device of a wind power generating set according to any one of claims 1-3, wherein the number of the loading mechanisms corresponds to the number of bearings to be tested. 6 . The pitch bearing testing device of a wind power generating set according to claim 5 , wherein the loading mechanism comprises a counterweight loading mechanism, an electric loading mechanism or a combination of the two. 6 . 7. The pitch bearing testing device of wind power generating set as claimed in claim 6, wherein the counterweight loading mechanism comprises a loading bracket, a counterweight and a lifting plate, and the loading bracket is provided with a The guide rails on which the board slides are provided with pulleys on the top and bottom of the vertical support. 8. The pitch bearing testing device of a wind power generating set according to claim 7, wherein the loading bracket is a vertical bracket with a symmetrical structure. 9 . The pitch bearing testing device of a wind power generating set according to claim 6 , wherein the counterweight loading mechanism is connected to the connecting belt through an annular lifting lug and a steel cable. 10 . 10 . The pitch bearing testing device of a wind power generating set according to claim 6 , wherein the electric loading mechanism is connected to a reel, and the connection belt can be wound on the reel. 11 .

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