CN219977763U

CN219977763U - Monitoring device, gear box and wind generating set

Info

Publication number: CN219977763U
Application number: CN202321296270.2U
Authority: CN
Inventors: 孙伟
Original assignee: Beijing Goldwind Smart Energy Service Co Ltd
Current assignee: Beijing Goldwind Smart Energy Service Co Ltd
Priority date: 2023-05-25
Filing date: 2023-05-25
Publication date: 2023-11-07
Anticipated expiration: 2033-05-25

Abstract

The utility model provides a monitoring devices, gear box and wind generating set, monitoring devices are used for monitoring the axial float of the high-speed axle of gear box, high-speed axle fixedly connected with brake disc, and monitoring devices includes two sets of sensing element, and two sets of sensing element set up each other, and the brake disc can be arranged in between two sets of sensing element to make two sets of sensing element respectively towards two quotations of brake disc, any sensing element in two sets of sensing element can be triggered when reaching the interval of settlement interval with the quotation of brake disc. According to the method, the brake disc fixedly connected with the high-speed shaft is used as a measurement target, and the axial displacement of the high-speed shaft can be indirectly measured and monitored, so that the hidden danger of the axial movement of the high-speed shaft can be timely found, the high-speed shaft can be helped to run for a long time in the state of the axial movement, the risk of serious consequences is reduced, and the hidden danger and loss are further reduced.

Description

Monitoring device, gear box and wind generating set

Technical Field

The present disclosure relates to the field of wind power generation, and more particularly, to a monitoring device, a gearbox, and a wind generating set.

Background

Wind energy is increasingly paid attention as a clean renewable energy source, and with the proposal of national double-carbon targets, wind power generation in new energy sources is increasingly paid attention, and the installation of wind power generation equipment is increasingly improved. At present, the wind generating set has two types of direct drive and non-direct drive (including doubly-fed type), but the non-direct drive wind generating set (including doubly-fed type) can use a gear box to increase the rotation speed of the input end of a set impeller so as to match the rated rotation speed of a generator, the gear box is easy to generate the condition that a high-speed end output gear shaft (short for a high-speed shaft) moves after running for a period of time, and the set gear box has serious consequences when running for a long time with the problems: the transmission mechanism at the high-speed end, the generator and the bearing of the gearbox running at high speed are damaged lightly, and meanwhile, the service life of the flexible mechanism part of the coupler is shortened; the heavy weight damages the high-speed shaft of the gear box and the gear piece meshed with the high-speed shaft, so that the gear box is returned to a factory for maintenance or is maintained on a tower, the generating capacity of a unit is lost, and more maintenance cost is generated; the more serious consequence is that the brake disc arranged on the high-speed shaft and the high-speed brake generate intermittent friction to cause fire, so that the fan is burnt out, and extremely serious potential safety hazard and economic loss are generated.

However, at present, no device for monitoring and timely finding out the high-speed shaft movement of the gear box is specially available on the market, and related documents are few, and most of documents describe the problem of the high-speed shaft movement found by a worker climbing a tower after the bearing problem is indirectly found out through a vibration monitoring system of the gear box. Although there are monitoring devices or solutions for gearboxes and spindle play, such monitoring devices measure the axial displacement of the spindle by providing a measuring element near the end face of the spindle, which measuring element is divided into two types: 1. mechanical microswitches or travel switches; 2. the laser ranging sensor and the upper computer device. The shaft end surface of the high-speed shaft is not exposed outside because the high-speed shaft is connected with the coupling, so that an installation position cannot be provided for the measuring element, and the axial displacement of the high-speed shaft cannot be directly measured.

Therefore, the problem of the shift of the high-speed shaft of the gearbox is urgent to be found in time so as to reduce potential safety hazards and losses.

Disclosure of Invention

Therefore, how to find out the axial movement of the high-speed shaft of the gearbox in time is important.

In one general aspect, a monitoring device is provided for monitoring axial play of a high-speed shaft of a gearbox, the high-speed shaft being fixedly connected with a brake disc, the monitoring device comprises two groups of sensing elements, the two groups of sensing elements are arranged opposite to each other, the brake disc can be placed between the two groups of sensing elements so that the two groups of sensing elements face two disc surfaces of the brake disc respectively, and any one of the two groups of sensing elements can be triggered when a distance between the two groups of sensing elements and the disc surface of the brake disc reaches a set distance.

Optionally, any one of the two sets of sensing elements includes a power terminal, a first electrode post, a second electrode post and a second signal terminal, the power terminal is used for connecting an external power source, the first electrode post is connected with the power terminal, the first electrode post and the second electrode post are arranged in parallel and can simultaneously face the disc surface of the brake disc, the second electrode post is connected with the second signal terminal, and the second signal terminal is used for outputting a sensing signal.

Optionally, any one of the two sets of sensing elements further comprises: a self-healing fuse connected between the power terminal and the first electrode post; and the first signal wiring terminal is connected to any node between the first electrode terminal and the self-recovery fuse and is used for outputting a sensing signal.

Optionally, a spacing between the first electrode column and the second electrode column is greater than or equal to 10cm; and taking a plane perpendicular to the axial direction of the first electrode column and tangent to the conductive contact surface of the first electrode column as a first reference surface, and taking a plane perpendicular to the axial direction of the second electrode column and tangent to the conductive contact surface of the second electrode column as a second reference surface, wherein the distance between the first reference surface and the second reference surface is smaller than 1mm.

Optionally, any one of the two sets of sensing elements further comprises: the shell is provided with a first assembly hole and a second assembly hole, the first electrode column penetrates through the first assembly hole to extend out of the shell, the second electrode column penetrates through the second assembly hole to extend out of the shell, a first protruding portion is arranged on the outer peripheral wall of the first electrode column, and a second protruding portion is arranged on the outer peripheral wall of the second electrode column; the first elastic piece is arranged at one end of the first electrode column, which is positioned in the shell, and is used for applying extrusion force to the first electrode column so that the first protruding part is in contact with the inner wall surface of the shell; the second elastic piece is arranged at one end of the second electrode column, which is positioned in the shell, and is used for applying extrusion force to the second electrode column so that the second protruding part is in contact with the inner wall surface of the shell.

Optionally, the first electrode column and the second electrode column are made of a self-lubricating conductive material.

Optionally, any one of the two sets of sensing elements comprises at least one of: travel switch, proximity switch, electromagnetic switch.

Optionally, the monitoring device further comprises a mounting bracket, the two sets of sensing elements are mounted on the mounting bracket, and positions of the two sets of sensing elements on the mounting bracket are adjustable.

In another general aspect, there is provided a gearbox comprising: a low speed shaft; one end of the high-speed shaft is meshed with the low-speed shaft through a gear, and the other end of the high-speed shaft is provided with a brake disc; in any one of the above monitoring devices, two groups of sensing elements of the monitoring device are respectively located at two sides of the brake disc.

In another general aspect, there is provided a wind power plant comprising a gearbox as described above.

Optionally, the wind generating set further comprises a wind wheel and a generator; the gearbox is arranged between the hub of the wind wheel and the generator, the low-speed shaft of the gearbox is connected with the hub of the wind wheel, and the high-speed shaft of the gearbox is connected with the rotating shaft of the generator.

The utility model provides a monitoring devices, gear box and wind generating set, through regard as measuring target with high-speed shaft fixed connection's brake disc, can carry out indirect measurement and monitoring to high-speed shaft's axial displacement, thereby in time discover high-speed shaft's axial float hidden danger, help reducing high-speed shaft and move for a long time under the state of axial float and produce the risk of serious result, and then reduce potential safety hazard and loss, still can improve wind generating set maintenance in-process convenience, reduce cost of labor and the fortune dimension cost of unit. And the axial float monitoring can be realized by utilizing two groups of sensing elements, and the device has the advantages of simple structure and high reliability. Meanwhile, the play distance of the high-speed shaft can be accurately monitored by adjusting the size of the gap between the induction element and the brake disc, and an accurate basis is provided for setting a play processing scheme for a generator set with a gear box.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other objects and features of the present utility model will become more apparent from the following description of the embodiments thereof, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram showing the installation position and the schematic structure of a monitoring device according to one embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating an internal structure of a monitoring device according to one embodiment of the present disclosure;

fig. 3 is a schematic diagram illustrating a signal transmission process of a monitoring device according to one embodiment of the present disclosure.

Fig. 1 to 3 reference numerals illustrate:

10: a monitoring device; 11: an inductive element; 111: a power supply terminal; 112: a first electrode column; 1121: a first boss; 113: a second electrode column; 1131: a second protruding portion; 114: a second signal terminal; 115: a self-healing fuse; 116: a first signal terminal; 117: a housing; 118: a first elastic member; 119: a second elastic member; 12: a mounting bracket;

20: a gear box; 21: a high-speed shaft; 22: a brake disc.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the utility model, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after an understanding of the present disclosure.

As used herein, the term "and/or" includes any one of the listed items associated as well as any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in the examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

In the description, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" or "coupled to" the other element, it can be directly "on" the other element, be directly "connected to" or be "coupled to" the other element, or one or more other elements intervening elements may be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" or "directly coupled to" another element, there may be no other element intervening elements present.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, amounts, operations, components, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, operations, components, elements, and/or combinations thereof.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs after understanding this disclosure. Unless explicitly so defined herein, terms (such as those defined in a general dictionary) should be construed to have meanings consistent with their meanings in the context of the relevant art and the present disclosure, and should not be interpreted idealized or overly formal.

In addition, in the description of the examples, when it is considered that detailed descriptions of well-known related structures or functions will cause a ambiguous explanation of the present disclosure, such detailed descriptions will be omitted.

The monitoring device 10, the gearbox 20 and the wind generating set provided by the embodiments of the present disclosure will be described below with reference to fig. 1 to 3.

As shown in fig. 1, an embodiment of an aspect of the present disclosure provides a monitoring device 10 for monitoring axial play of a high-speed shaft 21 of a gearbox 20, where the high-speed shaft 21 is fixedly connected with a brake disc 22, the monitoring device 10 includes two sets of sensing elements 11 (only one set of sensing elements 11 is labeled in the figure for convenience of marking, the other set of sensing elements 11 is another symmetrical structure), the two sets of sensing elements 11 are disposed opposite to each other, the brake disc 22 can be placed between the two sets of sensing elements 11 so that the two sets of sensing elements 11 face two disc surfaces of the brake disc 22 respectively, and any one sensing element 11 of the two sets of sensing elements 11 can be triggered when a distance between the two sets of sensing elements and the disc surface of the brake disc 22 reaches a set distance.

According to the monitoring device 10 of the embodiment of the disclosure, the brake disc 22 fixedly connected with the high-speed shaft 21 is used as a measurement target, so that the axial displacement of the high-speed shaft 21 can be indirectly measured and monitored, the hidden danger of axial movement of the high-speed shaft 21 can be timely found, the risk of long-time operation and serious consequences of the high-speed shaft 21 in the state of axial movement can be reduced, the hidden danger and loss can be further reduced, the convenience of a generator set with the brake disc 22 in the maintenance process can be improved, and the labor cost and the operation and maintenance cost of the generator set can be reduced. And the axial float monitoring can be realized by utilizing the two groups of sensing elements 11, and the device has the advantages of simple structure and high reliability. In particular, the brake disc 22 is used for maintenance braking or emergency braking protection, as shown in fig. 1, and is typically mounted on a shaft section of the high speed shaft 21 extending beyond the housing of the gearbox 20, the coupling being omitted from the drawing. The brake disc 22 is rigidly mounted on the high speed shaft 21 of the gearbox 20, in particular by means of a bushing. The sleeve mounted on the brake disc 22 is assembled on the high-speed shaft 21 through interference fit, so that the brake disc 22 and the high-speed shaft 21 can be regarded as a whole, and the brake disc 22 is rigidly mounted and connected on the sleeve through bolts, so that the brake disc 22 and the high-speed shaft 21 can be regarded as a whole. When the high-speed shaft 21 axially moves, the brake moves together with the high-speed shaft 21, and the axial movement distance of the brake disc 22 is consistent with the axial movement distance of the high-speed shaft 21, so that the axial movement of the brake disc 22 is substantially measured, and the feasibility of indirect measurement is ensured. At the same time, the brake disc 22 has a large exposed space around, so that enough mounting positions can be provided for the monitoring device 10, so that the monitoring device 10 is easy to mount and maintain and has high reliability. Meanwhile, the play distance of the high-speed shaft 21 can be accurately monitored by adjusting the gap between the sensing element 11 and the brake disc 22, and an accurate basis is provided for setting a play treatment scheme for the generator set with the gearbox 20.

Optionally, as shown in fig. 1, the monitoring device 10 further includes a mounting bracket 12, the two sets of sensing elements 11 are mounted on the mounting bracket 12, and the positions of the two sets of sensing elements 11 on the mounting bracket 12 are adjustable. Through configuration installing support 12, can provide reliable mounted position for two sets of sensing element 11 to after sensing element 11 stable installation, realize the position fine setting of sensing element 11 through the position of adjustment sensing element 11 on installing support 12, be convenient for install the both sides of brake disc 22 respectively with two sets of sensing element 11 earlier when assembling monitoring devices 10, carry out the accurate adjustment to the mounted position again, with the interval reasonable between guarantee sensing element 11 and the brake disc 22, help improving monitoring accuracy. As an example, as shown in fig. 1, the mounting bracket 12 includes a main bracket and two mounting arms, one ends of which are connected to the main bracket, and the other ends of which are each mounted with a set of sensing elements 11. During installation, the main support is fixedly connected with the shell of the gear box 20, then one installation arm is respectively installed on two sides of the brake disc 22, and the two installation arms can be adjusted to two sides of the brake disc 22, and then the main support is fixed on the shell of the gear box 20. A set of sensing elements 11 is then mounted on each mounting arm, and the positions of the sensing elements 11 are then adjusted such that a 2mm gap remains between each set of sensing elements 11 and the brake disc 22. When the high-speed shaft 21 of the gear box 20 moves, the brake disc 22 also moves along with the movement, and when the movement distance reaches or exceeds 2mm, a group of sensing elements 11 can be triggered, so that the movement displacement of the high-speed shaft 21 can be accurately monitored, and the accuracy can reach the millimeter level. Further, the position of the sensing element 11 on the mounting arm may be adjustable, the position of the mounting arm on the backbone bracket may be adjustable, and the position of the sensing element 11 on the mounting arm and the position of the mounting arm on the backbone bracket may be adjustable, for the two latter implementations, the backbone bracket and the two mounting arms are regarded as the mounting bracket 12, and the position of the sensing element 11 on the mounting bracket 12 may be adjustable, so that all the above implementations fall within the protection scope of the present disclosure. It should be understood that the embodiment of the mounting bracket 12 shown in fig. 1 including one backbone bracket and two mounting arms is not a limitation on the shape of the mounting bracket 12 of the present disclosure, and any other shape, so long as the mounting requirements can be met, falls within the scope of the present disclosure.

The inductive element 11 will be further described.

In some embodiments, optionally, any inductive element 11 of the two sets of inductive elements 11 comprises at least one of: travel switch, proximity switch, electromagnetic switch. By adopting at least one of a travel switch, a proximity switch and an electromagnetic switch and adjusting the interval between the adopted switch and the brake disc 22, when the brake disc 22 moves to the triggering position of the adopted switch along with the high-speed shaft 21, the adopted switch is triggered to send a triggering signal which represents that the axial displacement of the high-speed shaft 21 exceeds a safe distance and axial movement occurs, and rapid and reliable axial movement monitoring can be realized. Correspondingly, the generator set with the gear box 20 is provided with a signal processing circuit to receive the trigger signal of the adopted switch, so as to judge whether the high-speed shaft 21 moves beyond the operation safety range. As an example, the signal processing circuit may be an industrial personal computer, a PLC (Programmable Logic Controller ) system, or an embedded system, taking the example that the generator set is a wind turbine generator set, the signal processing circuit may belong to a stand-alone controller of the wind turbine generator set, or may belong to a farm-level controller of a wind farm where the wind turbine generator set is located.

In other embodiments, alternatively, as shown in fig. 1 and 2, any one of the sensing elements 11 in the two sets of sensing elements 11 includes a power terminal 111, a first electrode post 112, a second electrode post 113, and a second signal terminal 114, the power terminal 111 is used to connect to an external power source, the first electrode post 112 is connected to the power terminal 111 (the thickened line in fig. 2 represents a wire, fig. 3 is the same, and the same will not be described later), the first electrode post 112 and the second electrode post 113 are disposed in parallel and can simultaneously face the disc surface of the brake disc 22, the second electrode post 113 is connected to the second signal terminal 114, and the second signal terminal 114 is used to output a sensing signal. By arranging the power supply post 111 and the first electrode post 112 which are connected and the second signal post 114 and the second electrode post 113 which are connected, and arranging the first electrode post 112 and the second electrode post 113 in parallel towards the disc surface of the brake disc 22, when the brake disc 22 axially moves along with the high-speed shaft 21, the brake disc 22 simultaneously contacts the first electrode post 112 and the second electrode post 113 of a group of sensing elements 11, and the brake disc 22 is made of steel, and belongs to a conductive body, the first electrode post 112 and the second electrode post 113 can be conducted, so that the power supply post 111, the first electrode post 112, the second electrode post 113 and the second signal post 114 are sequentially conducted, and electricity (for example, 24V direct current as shown in fig. 3) at the power supply post 111 flows into the second electrode post 113 from the first electrode post 112 through the brake disc 22 and finally flows into the second signal post 114, so that accurate monitoring of the axial movement of the high-speed shaft 21 is realized. Since there are two contact points of the first electrode column 112 and the second electrode column 113 in common at this time, the reliability of monitoring can be improved. The same as in the previous embodiment, the generator set with the gear box 20 is also provided with the signal processing circuit to receive the signal transmitted by the second signal terminal 114, so as to determine whether the high-speed shaft 21 moves beyond the operation safety range. As an example, as shown in fig. 3, the signal processing circuit may receive the 24V voltage signal from the power terminal 111 transmitted through the second signal terminal 114, convert the voltage signal into a logic signal, determine whether the high-speed shaft 21 is moving beyond the operation safety range according to the change of the logic signal, and perform early warning or perform protection action when it is determined that the high-speed shaft 21 is moving, which is not limited in the present disclosure.

Optionally, as shown in fig. 2, any one of the sensing elements 11 in the two sets of sensing elements 11 further includes a self-healing fuse 115 and a first signal post 116, the self-healing fuse 115 being connected between the power post 111 and the first electrode post 112; the first signal post 116 is connected to any node between the first electrode post 112 and the self-healing fuse 115, and the first signal post 116 is used to output a sensing signal. Since the gear case 20 may be grounded through a wire, when the brake disc 22 contacts the first electrode post 112 and the second electrode post 113, there is a possibility that the 24V dc power connected to the power terminal 111 is shorted to the ground, and the 24V dc power also supplies power to other electric devices in the generator set, and the shorted to the ground may cause the voltage of the other electric devices to be pulled down, so that the electric devices cannot work normally. By connecting the self-recovery fuse 115 between the power terminal 111 and the first electrode column 112, when the induction element 11 contacts the brake disc 22 to cause a 24V dc ground short circuit and a large current passes between the power terminal 111 and the first electrode column 112, the self-recovery fuse 115 is triggered to turn over to a high-resistance state, so that the voltage of other electric equipment cannot be pulled down, and normal operation can be achieved. In addition, in the case where the self-restoring fuse 115 is flipped to the high-resistance state, the voltage signal transmitted from the power terminal 111 to the second signal terminal 114 through the first electrode post 112 and the second electrode post 113 is 0V instead of 24V, and thus the play of the high-speed shaft 21 cannot be reflected. In contrast, by connecting the first signal terminal 116 by connecting a wire between the first electrode post 112 and the self-recovery fuse 115, the first signal terminal 116 can be made to output a 24V voltage signal when the sensor element 11 does not contact the disc brake 22, and the first signal terminal 116 can be made to output a 0V voltage signal when the sensor element 11 contacts the disc brake 22 and the self-recovery fuse 115 is excited to flip to a high-resistance state, so that when the sensing signal output by the first signal terminal 116 is changed from the 24V voltage signal to the 0V voltage signal, it can be determined that the high-speed shaft 21 of the gear box 20 is shifted beyond the operation safety range, and reliable shift monitoring can be performed on the high-speed shaft 21 regardless of whether the gear box 20 is grounded or not. In general, when the gear case 20 is grounded, since the self-recovery fuse 115 is provided, the sensing signal outputted from the second signal terminal 114 is maintained at the 0V voltage signal, and cannot be used to determine whether the high-speed shaft 21 is shifted, and when the sensing signal outputted from the first signal terminal 116 is changed from the 24V voltage signal to the 0V voltage signal, it can be determined that the high-speed shaft 21 is shifted; when the gear case 20 is not grounded, the self-recovery fuse 115 does not operate, but when the gear case 20 is not grounded (for example, there is a rise in resistance due to the presence of lubricating oil), even if the self-recovery fuse 115 operates, the sensing signal output from the first signal terminal 116 cannot be changed from the 24V voltage signal to the 0V voltage signal, and the sensing signal output from the first signal terminal 116 is maintained at the 24V voltage signal or becomes another positive voltage signal smaller than 24V according to the actual situation, so that when the gear case 20 is not grounded or is not grounded, the sensing signal output from the first signal terminal 116 cannot be used to determine whether or not the high-speed shaft 21 is shifted, and when the sensing signal output from the second signal terminal 114 is changed from the 0V voltage signal to the non-0V voltage signal, it can be determined that the high-speed shaft 21 is shifted. Specifically, when the gearbox 20 is not grounded, the non-0V voltage signal is a 24V voltage signal; the non-0V voltage signal may be a 24V voltage signal or other positive voltage signal less than 24V when the gearbox 20 is poorly grounded. In short, regardless of the grounding condition of the gear case 20, as long as the sensing signal output by either one of the first signal post 116 and the second signal post 114 indicates that the high-speed shaft 21 is shifted, it is possible to determine that the high-speed shaft 21 is shifted, and a simple and reliable determination logic can be realized.

Optionally, the distance between the first electrode post 112 and the second electrode post 113 is greater than or equal to 10cm, so that the distance between the first electrode post 112 and the second electrode post 113 is as large as possible, and of course, since both the first electrode post 112 and the second electrode post 113 need to be located within the disc surface of the brake disc 22, the upper limit of the distance between the two is limited by the size of the brake disc 22. Meanwhile, a plane perpendicular to the axial direction of the first electrode column 112 and tangential to the conductive contact surface of the first electrode column 112 is taken as a first reference surface, and when the disc surface of the brake disc 22 moves to be coplanar with the first reference surface, the brake disc contacts with the first electrode column 112; a plane perpendicular to the axial direction of the second electrode column 113 and tangential to the conductive contact surface of the second electrode column 113 is taken as a second reference surface, and when the disc surface of the brake disc 22 moves to be coplanar with the second reference surface, the brake disc is contacted with the second electrode column 113; the spacing between the first reference surface and the second reference surface, i.e., the spacing between the first reference surface and the second reference surface, is sufficiently small to be coplanar or nearly coplanar so that the brake disc 22 can be brought into contact with the first electrode stud 112 and the second electrode stud 113 simultaneously or nearly simultaneously when axially moving. By making the first reference surface and the second reference surface coplanar or approximately coplanar, the distance between the first electrode column 112 and the second electrode column 113 is large enough to contact the first electrode column 112 and the second electrode column 113 at the same time when the brake disc 22 moves in the axial direction, and only contact one of the first electrode column 112 and the second electrode column 113 when the high-speed shaft 21 deflects slightly, so that the risk of misjudgment of axial movement caused by the simultaneous contact of the first electrode column 112 and the second electrode column 113 when the high-speed shaft 21 deflects slightly is reduced, the monitoring accuracy is improved, and the loss caused by the alarm, maintenance, shutdown and other conditions after misjudgment is reduced.

Optionally, as shown in fig. 2, any one of the sensing elements 11 in the two sets of sensing elements 11 further includes a housing 117, a first elastic member 118 and a second elastic member 119, the housing 117 is provided with a first assembly hole through which the first electrode post 112 protrudes out of the housing 117, and a second assembly hole through which the second electrode post 113 protrudes out of the housing 117, the outer peripheral wall of the first electrode post 112 is provided with a first protrusion 1121, and the outer peripheral wall of the second electrode post 113 is provided with a second protrusion 1131; the first elastic member 118 is disposed at an end of the first electrode column 112 located in the housing 117, for applying a pressing force to the first electrode column 112 such that the first protruding portion 1121 abuts against an inner wall surface of the housing 117; the second elastic member 119 is disposed at an end of the second electrode column 113 located in the housing 117, and is configured to apply a pressing force to the second electrode column 113 so that the second protrusion 1131 abuts against an inner wall surface of the housing 117. By adopting the above structure, on the one hand, when the first electrode column 112 and the second electrode column 113 are in contact with the brake disc 22, they can be kept in close contact with the brake disc 22 under the action of elastic extrusion force, so that stable output of the sensing signal is ensured. On the other hand, when the first electrode post 112 and the second electrode post 113 are in disconnection with the brake disc 22, the state of extension can be restored under the action of elastic extrusion force, and the extension length is ensured to be unchanged under the mechanical limiting action of the first protruding part 1121 and the second protruding part 1131, so that the sensing element 11 can restore the monitoring capability and the monitoring precision again, and the long-term stable operation of the monitoring device 10 is ensured. It will be appreciated that the monitoring capability and accuracy of the sensing element 11 can be ensured by periodically adjusting the spacing between the sensing element 11 and the brake disc 22 after being put into operation.

Alternatively, the first electrode post 112 and the second electrode post 113 are made of a self-lubricating conductive material. The speed of rotation of the high speed shaft 21 is relatively high, up to 2 kilo-revolutions per minute. By selecting the self-lubricating conductive material for the first electrode column 112 and the second electrode column 113, the first electrode column 112 and the second electrode column 113 can be ensured to be in smooth contact with the brake disc 22 under the condition that no additional lubricating coating is arranged, the risk that the first electrode column 112 and the second electrode column 113 are damaged can be reduced by utilizing the self-lubricating characteristic of the self-lubricating conductive material, the risk that the coating is dropped when the coating is additionally arranged can be reduced, and the reliability of the first electrode column 112 and the second electrode column 113 is ensured. As an example, the self-lubricating conductive material may be a metal material having a lubricating effect itself, such as brass, or may be a powder metallurgy die casting material that increases a lubricating effect by adding carbon atoms, such as silver carbon or copper carbon powder metallurgy die casting material, although other materials having self-lubricating conductive properties may be used, which is not limited in this disclosure.

Another embodiment of the present disclosure provides a gear box 20, where the gear box 20 includes a low-speed shaft, a high-speed shaft 21, and the monitoring device 10 of any one of the foregoing embodiments, one end of the high-speed shaft 21 is meshed with the low-speed shaft through a gear, the other end of the high-speed shaft 21 is provided with a brake disc 22, and two groups of sensing elements 11 of the monitoring device 10 are respectively located on two sides of the brake disc 22. The gearbox 20 includes the monitoring device 10 according to any of the above embodiments, so that all the advantages of the monitoring device 10 are provided and will not be described herein.

An embodiment of another aspect of the present disclosure provides a wind turbine generator system, where the wind turbine generator system includes the gear box 20 of the foregoing embodiment, so that all the beneficial technical effects of the gear box 20 are not described herein.

Optionally, the wind generating set further comprises a wind wheel and a generator; the gear box 20 is arranged between the hub of the wind wheel and the generator, the low-speed shaft of the gear box 20 is connected with the hub of the wind wheel, the high-speed shaft 21 of the gear box 20 is connected with the rotating shaft of the generator, the low-speed rotation of the wind wheel can be converted into the high-speed rotation of the high-speed shaft 21, the speed increase is realized, the rated rotation speed of the generator is matched for generating electricity, and the reliable operation of the wind generating set is ensured. In other words, the wind power generator set of the present disclosure is a non-direct drive wind power generator set (including doubly fed).

While certain embodiments have been shown and described, it would be appreciated by those skilled in the art that changes and modifications may be made to these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A monitoring device (10) for monitoring axial play of a high-speed shaft (21) of a gearbox (20), characterized in that the high-speed shaft (21) is fixedly connected with a brake disc (22), the monitoring device (10) comprises two groups of sensing elements (11), the two groups of sensing elements (11) are arranged opposite to each other, the brake disc (22) can be placed between the two groups of sensing elements (11), so that the two groups of sensing elements (11) respectively face two disc surfaces of the brake disc (22), and any one sensing element (11) of the two groups of sensing elements (11) can be triggered when the distance between the two sensing elements and the disc surface of the brake disc (22) reaches a set distance.

2. The monitoring device (10) according to claim 1, wherein any one of the sensing elements (11) of the two sets of sensing elements (11) comprises a power terminal (111), a first electrode post (112), a second electrode post (113) and a second signal terminal (114), the power terminal (111) is used for being connected with an external power source, the first electrode post (112) is connected with the power terminal (111), the first electrode post (112) and the second electrode post (113) are arranged in parallel and can simultaneously face the disc surface of the brake disc (22), the second electrode post (113) is connected with the second signal terminal (114), and the second signal terminal (114) is used for outputting a sensing signal.

3. The monitoring device (10) according to claim 2, wherein any sensing element (11) of the two sets of sensing elements (11) further comprises:

a self-restoring fuse (115) connected between the power terminal (111) and the first electrode post (112);

-a first signal terminal (116) connected to any node between the first electrode terminal (112) and the self-healing fuse (115), the first signal terminal (116) being for outputting a sensing signal.

4. The monitoring device (10) according to claim 2, wherein,

a spacing between the first electrode column (112) and the second electrode column (113) is greater than or equal to 10cm;

and taking a plane perpendicular to the axial direction of the first electrode column (112) and tangential to the conductive contact surface of the first electrode column (112) as a first reference surface, and taking a plane perpendicular to the axial direction of the second electrode column (113) and tangential to the conductive contact surface of the second electrode column (113) as a second reference surface, wherein the distance between the first reference surface and the second reference surface is smaller than 1mm.

5. The monitoring device (10) according to claim 2, wherein any sensing element (11) of the two sets of sensing elements (11) further comprises:

a housing (117), wherein the housing (117) is provided with a first assembly hole and a second assembly hole, the first electrode column (112) penetrates through the first assembly hole to extend out of the housing (117), the second electrode column (113) penetrates through the second assembly hole to extend out of the housing (117), a first protruding portion (1121) is arranged on the outer peripheral wall of the first electrode column (112), and a second protruding portion (1131) is arranged on the outer peripheral wall of the second electrode column (113);

a first elastic member (118) provided at one end of the first electrode column (112) located in the housing (117) for applying a pressing force to the first electrode column (112) so that the first protruding portion (1121) abuts against an inner wall surface of the housing (117);

and a second elastic member (119) disposed at an end of the second electrode column (113) located in the housing (117) for applying a pressing force to the second electrode column (113) so that the second protrusion (1131) abuts against an inner wall surface of the housing (117).

6. The monitoring device (10) of claim 2, wherein the first electrode column (112) and the second electrode column (113) are made of a self-lubricating conductive material.

7. The monitoring device (10) according to claim 1, wherein any sensing element (11) of the two sets of sensing elements (11) comprises at least one of: travel switch, proximity switch, electromagnetic switch.

8. The monitoring device (10) according to any one of claims 1 to 7, further comprising a mounting bracket (12), wherein the two sets of sensing elements (11) are mounted on the mounting bracket (12) and wherein the positions of the two sets of sensing elements (11) on the mounting bracket (12) are adjustable.

9. A gearbox (20), characterized in that the gearbox (20) comprises:

a low speed shaft;

a high-speed shaft (21), wherein one end of the high-speed shaft (21) is meshed with the low-speed shaft through a gear, and a brake disc (22) is arranged at the other end of the high-speed shaft (21);

the monitoring device (10) according to any one of claims 1 to 8, the two groups of inductive elements (11) of the monitoring device (10) being located on either side of the brake disc (22).

10. A wind power plant, characterized in that it comprises a gearbox (20) according to claim 9.

11. The wind power generation set of claim 10, further comprising a wind wheel and a generator;

the gearbox (20) is arranged between the hub of the wind wheel and the generator, the low-speed shaft of the gearbox (20) is connected with the hub of the wind wheel, and the high-speed shaft (21) of the gearbox (20) is connected with the rotating shaft of the generator.