Bearing assembly, wind turbine generator unit and crack detection device

Abstract

The application discloses a bearing assembly, a wind turbine generator and a crack detection device. The bearing assembly comprises a bearing body and a crack detection device arranged on the bearing body. The crack detection device comprises a sensing part, and the sensing part comprises a conductive layer arranged in insulation with the bearing body. The conductive layer comprises a first wire, the first wire extends by a predetermined length in the circumferential direction of the bearing body and has a first contact point and a second contact point which are spaced apart. The bearing body has a safe state and a crack state. In the safe state, the first contact point and the second contact point are in communication, and an external current can be transmitted between the first contact point and the second contact point. In the crack state, the bearing body generates a crack, part of the first wire located at the crack position of the bearing body is broken, and the first contact point and the second contact point are arranged in disconnection. The application can timely find whether the bearing body is cracked.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crack detection, in particular to a bearing assembly, a wind turbine generator unit and a crack detection device. BACKGROUND

[0002] A plurality of large bearings are used in the wind turbine generator unit, such as a variable pitch bearing, a yaw bearing, a main shaft bearing and the like, which play a crucial role in the operation of the unit.

[0003] At present, the bearing cracking problem has long plagued the development of the wind power industry. Once the bearing cracks, it will pose a serious threat to the safety of the staff and the stable operation of the wind turbine generator unit. SUMMARY

[0004] The present application provides a bearing assembly, a wind turbine generator unit and a crack detection device, which can timely find out whether the bearing cracks.

[0005] In a first aspect, the present application provides a bearing assembly, which comprises: a bearing body;

[0006] A crack detection device is arranged on the bearing body, and the crack detection device comprises a sensing part, the sensing part comprises a conductive layer arranged in insulation with the bearing body, the conductive layer comprises a first wire, the first wire extends a predetermined length in the circumferential direction of the bearing body and has a first contact point and a second contact point which are spaced apart; wherein the bearing body has a safe state and a crack state, in the safe state, the first contact point and the second contact point are in communication, and an external current can be transmitted between the first contact point and the second contact point; in the crack state, the bearing body produces a crack, part of the first wire located at the crack position of the bearing body is broken, and the first contact point and the second contact point are arranged in disconnection.

[0007] According to the foregoing embodiment of the first aspect of the present application, the conductive layer further comprises a plurality of second wires, the plurality of second wires are spaced apart in the length direction of the first wire, each second wire is arranged to intersect the first wire and divide the first wire into multiple segments, and the diameter width of the second wire is greater than that of the first wire. By dividing the first wire into multiple segments by the second wire with a larger diameter width, the tensile stress received by the first wire when the surface of the bearing body produces a crack can be concentrated on the wire segment corresponding to the crack position of the bearing body, the sensitivity of the sensing part to the crack can be improved, and the detection accuracy of the crack detection device is improved.

[0008] According to any one of the preceding embodiments of the first aspect of the present application, one of the plurality of second conductive wires is connected to the first contact of the first conductive wire, and the rest of the second conductive wires are connected to the first conductive wire at the second contact. This allows the crack detection device to detect the specific location of the crack in the bearing body.

[0009] According to any one of the preceding embodiments of the first aspect of the present application, the first conductive wire is provided in plurality, and the plurality of first conductive wires are spaced apart in a direction intersecting the length direction of the first conductive wire, and each of the second conductive wires is connected to each of the first conductive wires. This reduces or avoids the situation where the first conductive wire is locally damaged due to a mistake, and the sensing portion cannot be used continuously.

[0010] According to any one of the preceding embodiments of the first aspect of the present application, the sensing portion further comprises an insulating substrate, and the conductive layer is arranged on one side surface of the insulating substrate in the thickness direction, and the sensing portion is connected to the bearing body through the insulating substrate.

[0011] According to any one of the preceding embodiments of the first aspect of the present application, the insulating substrate is provided with a strength reduction groove formed by recessing inward from the edge of the insulating substrate, and / or the insulating substrate is provided with a strength reduction hole arranged at the edge of the insulating substrate. By arranging the strength reduction groove and / or the strength reduction hole on the insulating substrate, the tensile strength of the corresponding position of the insulating substrate is reduced, so that when the sensing portion is subjected to tensile stress, the corresponding position of the strength reduction groove and / or the strength reduction hole is more likely to be pulled off, thereby improving the sensitivity of the sensing portion to cracks and the detection accuracy of the crack detection device.

[0012] According to any one of the preceding embodiments of the first aspect of the present application, the insulating substrate is a flexible substrate that can be bent.

[0013] According to any one of the preceding embodiments of the first aspect of the present application, the sensing portion further comprises an insulating protective layer arranged on the side of the conductive layer away from the insulating substrate, and the first contact and the second contact are exposed on the outside of the insulating protective layer.

[0014] According to any one of the preceding embodiments of the first aspect of the present application, the crack detection device further comprises a measuring portion and an alarm, the measuring portion comprises a power supply module and a detection module, the power supply module is used to apply a voltage between the first contact and the second contact, and the detection module is configured to detect the first current value between the first contact and the second contact, when the first current value is detected to be less than a preset threshold current value, and the duration of the first current value is greater than a predetermined time, the bearing body has a crack, and an alarm signal is sent at this time.

[0015] According to any one of the foregoing embodiments of the first aspect of the present application, the crack detection device comprises a plurality of the sensing portions, and the plurality of the sensing portions are connected in series or connected in parallel. The plurality of the sensing portions are connected in series, such that a crack at any position on the surface of the bearing body within the arrangement range of the sensing portions causes the test circuit to be disconnected. The plurality of the sensing portions are connected in parallel, such that a crack on the surface of the bearing body causes the first wire of the corresponding sensing portion at the corresponding position to be broken. In this way, not only can it be detected whether the bearing body has a crack, but also the specific position of the crack on the bearing body can be detected.

[0016] According to any one of the foregoing embodiments of the first aspect of the present application, the bearing body comprises an inner ring and an outer ring that are rotatably connected, and the sensing portion is arranged on the circumferential surface of the outer ring radially outward, and / or the sensing portion is arranged on the circumferential surface of the inner ring radially inward.

[0017] According to any one of the foregoing embodiments of the first aspect of the present application, the first wire is arranged in a whole circle or partially arranged in the circumferential direction of the bearing body. The first wire is arranged in a whole circle in the circumferential direction of the bearing body, such that the crack detection device can detect each position of the bearing body in the circumferential direction. The first wire is partially arranged in the circumferential direction of the bearing body, for example, the first wire can be arranged at a high-risk position of the bearing body where a crack is likely to occur, thereby reducing the detection cost.

[0018] According to any one of the foregoing embodiments of the first aspect of the present application, the crack detection device comprises a plurality of the sensing portions, and the plurality of the sensing portions are arranged in sequence along the circumferential direction, and the projection of the two first wires of the two adjacent sensing portions in the axial direction of the bearing body overlaps. This can avoid a detection blind area between the two adjacent sensing portions in the circumferential direction of the bearing body, such that the preset detection range can be effectively detected.

[0019] In a second aspect, the embodiments of the present application provide a wind turbine generator, which comprises the bearing assembly according to any one of the foregoing embodiments.

[0020] According to the foregoing embodiments of the second aspect of the present application, the wind turbine generator further comprises a hub and a blade, and the hub and the blade are connected through the bearing assembly; and / or the wind turbine generator further comprises a tower and a nacelle, and the tower and the nacelle are connected through the bearing assembly.

[0021] In a third aspect, the embodiments of the present application provide a crack detection device, comprising a sensing part, the sensing part comprising: an insulating base; and a conductive layer disposed on the insulating base, the conductive layer comprising a first wire and a plurality of second wires, the first wire extending along a length direction of the insulating base and having first contacts and second contacts distributed at intervals, and the plurality of second wires being distributed at intervals in the length direction of the first wire, each of the second wires being disposed to intersect the first wire and divide the first wire into a plurality of segments, and the second wires having a larger diameter than the first wire. The first wire is divided into a plurality of wire segments by the second wires having a larger diameter, so that the tensile stress that the first wire can withstand at the intersection position of the first wire and the second wire is improved, the first wire is less likely to be pulled apart at the intersection position of the first wire and the second wire when the first wire is subjected to tensile stress, and the tensile stress can be concentrated on the wire segment between adjacent second wires. When the crack detection device is used for a bearing body and a crack occurs on the surface of the bearing body, the tensile stress that the first wire is subjected to can be concentrated on the wire segment corresponding to the crack position of the bearing body, the sensitivity of the sensing part to the crack can be improved, and the detection accuracy of the crack detection device is improved.

[0022] The bearing assembly, the wind turbine generator, and the crack detection device provided by the embodiments of the present application have the following advantages. The bearing assembly comprises a bearing body and a crack detection device disposed on the bearing body. The crack detection device comprises a sensing part. The sensing part comprises a conductive layer disposed in an insulating manner on the bearing body. The conductive layer comprises a first wire. The first wire extends in a circumferential direction of the bearing body by a predetermined length and has first contacts and second contacts distributed at intervals. When the bearing body is in a safe state, the first contacts and the second contacts are in communication, and an external current can smoothly flow through the first wire. When a crack occurs on the bearing body, the part of the first wire located at the crack position of the bearing body is broken due to tensile stress, so that the external current cannot flow through the first wire. Therefore, the electrical state of the first wire can be used to detect whether a crack occurs on the surface of the bearing body, and accurate and timely detection of whether the bearing body is cracked is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof as taken in conjunction with the accompanying drawings, in which like or similar designations of which are used to designate like or similar elements and in which:

[0024] Figure 1 A structural schematic diagram of a wind turbine generator provided by an embodiment of the present application is shown in the figure.

[0025] Figure 2 A structural schematic diagram of a bearing assembly provided by an embodiment of the present application is shown in the figure.

[0026] Figure 3 A structural schematic diagram of a crack detection device provided by an embodiment of the present application;

[0027] Figure 4 A structural schematic diagram of a crack detection device provided by an embodiment of the present application when used in a bearing assembly;

[0028] Figure 5 A structural schematic diagram of a crack detection device provided by another embodiment of the present application;

[0029] Figure 6 A structural schematic diagram of a crack detection device provided by still another embodiment of the present application;

[0030] Figure 7 A structural schematic diagram of a crack detection device provided by yet another embodiment of the present application;

[0031] Figure 8 A structural schematic diagram of a crack detection device provided by another embodiment of the present application;

[0032] Figure 9 A structural schematic diagram of a crack detection device provided by still another embodiment of the present application;

[0033] Figure 10 A structural schematic diagram of a crack detection device provided by another embodiment of the present application;

[0034] Figure 11 A structural schematic diagram of a crack detection device provided by another embodiment of the present application when used in a bearing assembly;

[0035] Figure 12 A structural schematic diagram of a crack detection device provided by another embodiment of the present application;

[0036] Figure 13 A structural schematic diagram of a crack detection device provided by still another embodiment of the present application.

[0037] BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 1 - tower; 2 - nacelle; 3 - generator; 4 - impeller; 41 - hub; 42 - blade; 5 - bearing assembly;

[0039] 10 - bearing body; 101 - inner ring; 102 - outer ring;

[0040] 20 - crack detection device;

[0041] 100 - sensing portion;

[0042] 110 - conductive layer; 111 - first conductive wire; 111a - first contact; 111b - second contact; 112 - second conductive wire;

[0043] 120 - Insulating base; 121 - Notch of weakening; 122 - Hole of weakening;

[0044] 130 - Insulating protective layer;

[0045] 200 - Measuring unit; 201 - First electrode; 202 - Second electrode;

[0046] X - First direction; Y - Second direction; C - Circumferential direction. DETAILED DESCRIPTION

[0047] The features and exemplary embodiments of various aspects of the present application will be described below in detail, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application, and are not configured to limit the present application. The present application can be implemented without some of these specific details for those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0048] It should be noted that, in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0049] A variety of large bearings are used in wind turbine generators, such as variable pitch bearings, yaw bearings, main shaft bearings, etc., which play a crucial role in the operation of the unit. In the wind power industry, bearing cracking threatens the safety of workers and the stable operation of wind turbine generators, but currently only relies on manpower to regularly check whether the bearing is cracked, which has the problems of low inspection efficiency, low accuracy, and untimely discovery.

[0050] To solve the above problems, the embodiments of the present application provide a bearing assembly, a wind turbine generator and a crack detection device, which will be described below in combination with the accompanying drawings Figures 1 to 13 The embodiments of the bearing assembly, the wind turbine generator and the crack detection device are described.

[0051] Figure 1A structural schematic diagram of a wind turbine provided by an embodiment of the present application.

[0052] An embodiment of the present application provides a wind turbine, which comprises a tower 1 and a wind machine. The wind machine is installed on the top of the tower 1. The wind machine comprises a nacelle 2, a generator 3 and a rotor 4. The tower 1 and the nacelle 2 are connected through a bearing assembly. The rotor 4 comprises a hub 41 and blades 42. The hub 41 is connected with a rotor of the generator 3. The hub 41 and the blades 42 are connected through a bearing assembly. When wind acts on the rotor 4, the rotor 4 drives the rotor of the generator 3 to rotate, so as to realize the power generation of the wind turbine. The yawing function of the wind machine is realized through the rotation of the nacelle 2 relative to the tower 1. The variable pitch function of the blades 42 is realized through the rotation of the blades 42 relative to the hub 41, so as to improve the utilization rate of wind energy.

[0053] In order to ensure the safe and stable operation of the wind turbine, the bearing assembly needs to be in a good working state. Based on this, an embodiment of the present application provides a bearing assembly, which can be used in the wind turbine, and can be used to connect the nacelle 2 and the tower 1, or can be used to connect the hub 41 and the blades 4. By using the bearing assembly, the staff can timely find out whether the bearing body is cracked.

[0054] Figure 2 A structural schematic diagram of a bearing assembly provided by an embodiment of the present application.

[0055] The bearing assembly 5 provided by an embodiment of the present application comprises a bearing body 10 and a crack detection device 20. The crack detection device 20 is arranged on the bearing body 10.

[0056] The bearing body 10 has a safe state and a crack state. In the safe state, the bearing body 10 is not cracked. In the crack state, the bearing body 10 is cracked. The crack detection device 20 can automatically detect whether the surface of the bearing body 10 is cracked, so as to judge whether the bearing body 10 is changed from the safe state to the crack state.

[0057] In some embodiments, the bearing body 10 comprises an inner ring 101 and an outer ring 102 which are rotationally matched. In the crack state, the surface of at least one of the inner ring 101 and the outer ring 102 of the bearing body 10 is cracked.

[0058] Optionally, the crack detection device 20 can be arranged on the inner ring 101 and / or the outer ring 102 of the bearing body 10, so as to realize the detection of the inner ring 101 and / or the outer ring 102 of the bearing body 10.

[0059] In some optional embodiments, the bearing body 10 can further comprise a roller arranged between the inner ring 101 and the outer ring 102. The roller can reduce the friction generated when the inner ring 101 and the outer ring 102 relatively rotate.

[0060] Figure 3 A structural schematic diagram of a crack detection device provided by an embodiment of the present application is shown in the figure. Figure 4 A structural schematic diagram of a crack detection device provided by an embodiment of the present application when used in a bearing assembly is shown in the figure.

[0061] The embodiment of the present application also provides a crack detection device 20, which can be used as part of a bearing assembly 5 to detect whether a bearing body 10 has cracks, and can also be sold or used independently, and can also be used in other products that need to detect surface cracks.

[0062] In some embodiments, the crack detection device 20 provided by the embodiment of the present application includes a sensing part 100, the sensing part 100 includes a conductive layer 110, the conductive layer 110 includes a first wire 111, the first wire 111 can extend along a first direction X, and the first wire 111 has a first contact 111a and a second contact 111b which are spaced apart in the first direction X. Wherein the first direction X is the length direction of the first wire 111.

[0063] When the crack detection device 20 is used in the bearing assembly 5, the sensing part 100 of the crack detection device 20 is arranged on the surface of the bearing body 10, and the conductive layer 110 is arranged in insulation with the bearing body 10, and the first wire 111 extends a predetermined length in the circumferential direction C of the bearing body 10. In the safe state of the bearing body 10, the first contact 111a and the second contact 111b are in communication, and an external current can be transmitted between the first contact 111a and the second contact 111b. In the cracked state, the part of the first wire 111 located at the crack position of the bearing body 10 is broken, and the first contact 111a and the second contact 111b are arranged to be disconnected.

[0064] According to the crack detection device 20 provided by the embodiment of the present application, when the crack detection device 20 is arranged on the bearing body 10, when the bearing body 10 is in a safe state, the first contact 111a and the second contact 111b are in communication, and an external current can flow smoothly through the first wire 111, when the bearing body 10 has a crack, the part of the first wire 111 located at the crack position of the bearing body 10 is broken due to tensile stress, so that the external current cannot flow through the first wire 111, and thus the electrical state of the first wire 111 can detect whether the surface of the bearing body 10 has cracks, and thus the crack detection device 20 provided by the embodiment of the present application can accurately and timely detect whether the bearing body 10 is cracked.

[0065] Optionally, to facilitate the manufacture of the first wire 111, the diameter width of the first wire 111 can be arranged to be between 0.075mm and 0.15mm, so that smaller cracks can also quickly break the first wire 111, and the sensitivity of the sensing part 100 to cracks is improved.

[0066] In some optional embodiments, when the crack detection device 20 is used in the bearing assembly 5, the sensing part 100 of the crack detection device 20 can be pasted on the surface of the bearing body 10 by means of colloid, which is simple and convenient to paste, and the first lead wire 111 always extends on the surface of the bearing body 10, so that the positions of the first lead wire 111 are fixed relative to the positions of the bearing body 10, and when the bearing body 10 generates a crack, the part of the first lead wire 111 corresponding to the crack position can be broken.

[0067] When the crack detection device 20 is used in the bearing assembly 5, in some optional embodiments, the sensing part 100 can be arranged on the circumferential surface of the outer ring 102 radially outside the outer ring 102, so as to detect whether there is a crack on the outer circumferential surface of the outer ring 102.

[0068] Of course, the sensing part 100 can also be arranged on the circumferential surface of the inner ring 101 radially inside the inner ring 101, so as to detect whether there is a crack on the inner circumferential surface of the inner ring 101, or the sensing part 100 can also be arranged on the circumferential surface of the outer ring 102 radially outside the outer ring 102 and on the circumferential surface of the inner ring 101 radially inside the inner ring 101, so as to increase the detection range.

[0069] In other optional embodiments, the sensing part 100 can also be arranged on the end surface of the outer ring 102 and / or the inner ring 101 of the bearing body 10, so as to detect whether there is a crack on the end surface, which is also within the protection scope of the present application.

[0070] It can be understood that in some optional embodiments, the sensing part 100 can also be arranged on the circumferential surface of the outer ring 102 radially inside the outer ring 102 and / or on the circumferential surface of the inner ring 101 radially outside the inner ring 101, so as to detect whether there is a crack on the inner circumferential surface of the outer ring 102 and / or on the outer circumferential surface of the inner ring 101.

[0071] Optionally, in order to avoid the sensing part 100 interfering with the rotation of the outer ring 102 and the inner ring 101, when the sensing part 100 is arranged, a groove can be formed on the circumferential surface of the outer ring 102 radially inside the outer ring 102 and / or on the circumferential surface of the inner ring 101 radially outside the inner ring 101, and the sensing part 100 is embedded into the groove.

[0072] In some embodiments, in order to facilitate the access of the external current, a first lead wire connected with the first contact 111a and a second lead wire connected with the second contact 111b can be arranged, and the first lead wire and the second lead wire extend from between the outer ring 102 and the inner ring 101 to the outside, so that the external current is accessed through the first lead wire and the second lead wire, which is simple and convenient.

[0073] As a preferred embodiment, a lead slot can be formed on the circumferential surface of the radially inner side of the outer ring 102 and / or the circumferential surface of the radially outer side of the inner ring 101, the lead slot extending to the end surface of the bearing body 10, the first lead wire and the second lead wire being embedded in the lead slot, so as to avoid the first lead wire and the second lead wire interfering with the rotation of the outer ring 102 and the inner ring 101.

[0074] Of course, the first contact 111a and the second contact 111b can also be arranged outside the bearing body 10, and the electrical connection between the first contact 111a, the second contact 111b and the first lead wire 111 can be achieved through a lead wire, which is also within the protection scope of the present application.

[0075] In some embodiments, the first lead wire 111 can be arranged in a whole circle on the circumferential direction C of the bearing body 10, so that the crack detection device 20 can detect the position of the bearing body 10 on the circumferential direction C of the bearing body 10. Of course, the first lead wire 111 can also be arranged locally on the circumferential direction C of the bearing body 10, and can be arranged at any position as needed, for example, the first lead wire 111 can be arranged only at the high-risk position of the bearing body 10 prone to cracking, which can reduce the detection cost, and is also within the protection scope of the present application.

[0076] In some optional embodiments, since the bearing body 10 cracks, the crack usually extends along the axial direction of the bearing assembly 5, therefore, when the crack detection device 20 is used for the bearing assembly 5, the first lead wire 111 can be arranged to extend along the circumferential direction C of the bearing body 10, which can reduce the length of the first lead wire 111, and on the other hand, when the bearing body 10 cracks, the first lead wire 111 is subjected to a tensile stress along the extension direction of the first lead wire 111, which can improve the sensitivity of the first lead wire 111 to the crack.

[0077] Figure 5 A structural schematic diagram of a crack detection device provided for another embodiment of the present application; Figure 6 A structural schematic diagram of a crack detection device provided for another embodiment of the present application; Figure 7 A structural schematic diagram of a crack detection device provided for another embodiment of the present application.

[0078] As Figure 5As shown, in some optional embodiments, the crack detection device 20 provided by the embodiments of the present application, the conductive layer 110 of the sensing part 100 can further include a plurality of second wires 112, the plurality of second wires 112 are spaced apart in the first direction X, each second wire 112 is arranged intersecting the first wire 111 and divides the first wire 111 into multiple segments, and the diameter width of the second wire 112 is greater than the diameter width of the first wire 111. Wherein, the second wire 112 extends along the second direction Y intersecting the first direction X, so that the second wire 112 is arranged intersecting the first wire 111. Optionally, the second direction Y is perpendicular to the first direction X.

[0079] By dividing the first wire 111 into multiple wire segments through the plurality of second wires 112 with larger diameter width, the tensile stress that the first wire 111 can withstand at the intersection position with the second wire 112 is improved, so that when the first wire 111 is subjected to tensile stress, the intersection position of the first wire 111 and the second wire 112 is not easy to be pulled off, and the tensile stress can be concentrated on each wire segment located between adjacent two second wires 112; when the sensing part 100 is arranged on the bearing body 10 and a crack is generated on the surface of the bearing body 10, the tensile stress that the first wire 111 is subjected to can be concentrated on the wire segment corresponding to the crack position of the bearing body 10, so that the first wire 111 can be quickly pulled off even for a small crack, the sensitivity of the sensing part 100 to the crack is improved, and thus the detection accuracy of the crack detection device 20 is improved.

[0080] In some optional embodiments, the diameter width of the second wire 112 can be set to 6 to 15 times of the diameter width of the first wire 111, so that the tensile stress can be better concentrated on each wire segment of the first wire 111. Optionally, the diameter width of the second wire 112 can be set to 1mm to 2mm, and the interval between adjacent two second wires 112 can be set to 10mm to 100mm. The greater the diameter width of the second wire 112, the smaller the interval between adjacent two second wires 112, the less likely the intersection position of the first wire 111 and the second wire 112 is pulled off, and the tensile stress can be better concentrated on each wire segment located between adjacent two second wires 112, and the possibility that the intersection position of the first wire 111 and the second wire 112 corresponds to the crack position of the bearing body 10 is greater. The diameter width of the second wire 112 and the interval between adjacent two second wires 112 can be selected according to the manufacturing process, cost and specifications of the bearing body 10.

[0081] As Figure 6As shown, in some optional embodiments, one of the plurality of second wires 112 may be connected to the first contact 111a of the first wire 111, and the remaining second wires 112 are all connected to the first wire 111 with the connection point being the second contact 111b. That is, the remaining second wires 112 may all be provided with a second contact 111b.

[0082] When none of the segments of the first conductor 111 are broken, the first contact 111a and each of the second contacts 111b are connected, and the external current can flow smoothly through the entire first conductor 111. When a segment of the first conductor 111 breaks, the second contacts 111b located on the side of the broken conductor segment closer to the first contact 111a are still connected to the first contact 111a, while the second contacts 111b located on the side of the broken conductor segment away from the first contact 111a are disconnected from the first contact 111a. Therefore, by detecting the electrical state of each part of the first conductor 111 located between the first contact 111a and each of the second contacts 111b, it is possible not only to detect whether the first conductor 111 is broken, but also to detect the location of the break. Furthermore, when the crack detection device 20 is installed on the bearing body 10, it is possible not only to detect whether cracks have occurred on the surface of the bearing body 10, but also to detect the specific location of the cracks in the bearing body 10.

[0083] like Figure 7 As shown, in some optional embodiments, the conductive layer 110 of the sensing unit 100 may include a plurality of first wires 111, which may be spaced apart in a second direction Y intersecting the first direction X, and each second wire 112 is connected to each of the first wires 111. Optionally, the second direction Y is perpendicular to the first direction X.

[0084] Multiple first wires 111 are provided and connected in parallel through second wires 112, so that when a first wire 111 is partially broken, the conductive layer 110 remains conductive in the first direction X, and the sensing unit 100 can still be used. This can reduce or avoid situations where the sensing unit 100 cannot continue to be used due to partial damage to the first wire 111 caused by error.

[0085] Furthermore, since the resistance of the conductive layer 110 differs when all the first conductors 111 are conducting and when some or all of the first conductors 111 are broken, the degree of crack extension can also be detected by utilizing the change in the resistance of the conductive layer 110. Optionally, the presence and extent of crack extension can be detected based on the resistance or current of the conductive layer 110. As an optional embodiment, when the actual resistance or output current value of the conductive layer 100 changes compared to a set value, it indicates that a first conductor 111 has broken, and a crack has been generated. Simultaneously, by comparing the actual resistance or output current value with the set value, the number of broken first conductors 111 in the conductive layer 110 can be determined. The degree of crack extension can be determined based on the number of broken first conductors 111. For example, if the actual resistance is infinite or the output current is zero, it indicates that all the first conductors 111 in the conductive layer 110 are broken. To improve detection accuracy, the first conductors 111 can be made of a conductive material with high resistivity.

[0086] This application does not impose a specific limitation on the number of first wires 111 in the conductive layer 110. For example, there can be two, three, or more first wires 111. The more first wires 111 there are, the greater the tensile stress the conductive layer 110 can withstand, the less likely the conductive layer 110 is to break, and the lower the sensitivity of the sensing unit 100 to cracks. Of course, the conductive layer 110 may also include only one first wire 111, allowing even smaller cracks to quickly break the conductive layer 110, thereby improving the sensitivity of the sensing unit 100 to cracks, which is also within the scope of this application.

[0087] Figure 8 This is a schematic diagram of the structure of a crack detection device provided in another embodiment of this application; Figure 9 This is a structural schematic diagram of a crack detection device provided in another embodiment of this application.

[0088] like Figure 8 As shown, in some optional embodiments, the sensing unit 100 of the crack detection device 20 may further include an insulating substrate 120, with a conductive layer 110 disposed on one side surface of the insulating substrate 120 in the thickness direction. The insulating substrate 120 may extend along a first direction X, meaning its length direction may be parallel to the first direction X.

[0089] When the crack detection device 20 is used, the sensing unit 100 can be insulatedly connected to the surface of the product being tested through the insulating substrate 120. The insulating substrate 120 can prevent the conductive layer 110 from directly contacting the surface of the product being tested, ensuring that the sensing unit 100 will not remain conductive due to moisture or contact with other conductive materials after the first wire 111 is broken, thereby improving the detection accuracy.

[0090] When the crack detection device 20 is used for the bearing body 10, the sensing part 100 can be insulatedly connected to the bearing body 10 through the insulating base 120, and the conductive layer 110 is located on the side of the insulating base 120 away from the bearing body 10.

[0091] Optionally, when the surface of the product to be detected is coated with an insulating film, the sensing part 100 can also not include the insulating base 120, which is also within the protection scope of the present application.

[0092] As shown in FIG. 1, the sensing part 100 can include an insulating base 120 and a conductive layer 110. Figure 9 In some optional embodiments, the insulating base 120 can be provided with a weakening groove 121, which can be formed by recessing inward from the edge of the insulating base 120. By providing the weakening groove 121 on the insulating base 120, the tensile strength of the position corresponding to the weakening groove 121 of the insulating base 120 is reduced, so that when the sensing part 100 is subjected to tensile stress, the position corresponding to the weakening groove 121 is more likely to be pulled off, thereby improving the sensitivity of the sensing part 100 to cracks and the detection accuracy of the crack detection device 20.

[0093] Optionally, the weakening grooves 121 can be symmetrically arranged at the two edge regions of the insulating base 120 in the width direction of the insulating base 120, so that the structure of the insulating base 120 is symmetrical, and the tensile strength of the position corresponding to the weakening grooves 121 is further reduced. When the sensing part 100 is subjected to tensile stress, the tensile stress is more likely to concentrate on the first conductive wire 111, and the first conductive wire 111 is more likely to be pulled off.

[0094] Optionally, the insulating base 120 extends along a first direction X, and the width direction of the insulating base 120 is parallel to a second direction Y intersecting the first direction X. Optionally, the second direction Y is perpendicular to the first direction X.

[0095] Optionally, the weakening groove 121 can be a V-shaped projection in the thickness direction of the insulating base 120, so that the position corresponding to the bottom of the weakening groove 121 is more likely to be pulled off, and a better weakening effect can be achieved.

[0096] Please continue to refer to Figure 9 In some optional embodiments, the insulating base 120 can be provided with a weakening hole 122, which can be arranged at a distance from the edge of the insulating base 120. By providing the weakening hole 122 on the insulating base 120, the tensile strength of the position corresponding to the weakening hole 122 can be reduced, so that when the sensing part 100 is subjected to tensile stress, the position corresponding to the weakening hole 122 is more likely to be pulled off.

[0097] Optionally, the weakening hole 122 can be a long strip extending along the second direction Y, which can achieve a better effect of reducing the tensile strength.

[0098] Optionally, the conductive layer 110 of the sensing part 100 includes a plurality of first conductive wires 111 extending along the first direction X, the plurality of first conductive wires 111 are spaced apart along the second direction Y, and the weakening hole 122 can be arranged between any two adjacent first conductive wires 111. In this way, when the sensing part 100 is subjected to tensile stress, the tensile stress is more likely to concentrate on the first conductive wires 111, so that the first conductive wires 111 are more likely to be broken.

[0099] In some optional embodiments, the conductive layer 110 includes the first conductive wire 111 and a plurality of second conductive wires 112, the plurality of second conductive wires 112 are spaced apart along the extension direction of the first conductive wire 111, each second conductive wire 112 intersects the first conductive wire 111 and divides the first conductive wire 111 into a plurality of segments, and the weakening groove 121 and / or the weakening hole 122 can be arranged between any two adjacent second conductive wires 112.

[0100] By arranging the weakening groove 121 and / or the weakening hole 122, the strength of the portion of the insulating substrate 120 between any two adjacent second conductive wires 112 is reduced, so that the tensile stress is more likely to concentrate on each segment of the first conductive wire 111, and each segment of the first conductive wire 111 corresponding to the position of the weakening groove 121 is more likely to be broken or deformed, thereby improving the sensitivity and accuracy of the sensing part 100.

[0101] In some optional embodiments, the insulating substrate 120 is a flexible substrate that can be bent, so that the sensing part 100 can be attached to a non-planar detected surface such as a circumferential surface, and the first conductive wire 111 always extends on the detected surface.

[0102] Optionally, the insulating substrate 120 can be a substrate made of a polyimide (PI) material or a material containing PI, or a substrate made of insulating paper, so that the insulating substrate 120 can be bent.

[0103] Optionally, the conductive layer 110 can be a copper layer, and the sensing part 100 can be processed and etched from a copper-clad plate, that is, the sensing part 100 can be manufactured by using the manufacturing process of a flexible circuit board, which is simple and convenient. Of course, the conductive layer 110 can also be made of other conductive materials such as aluminum, silver, and graphite, which are also within the protection scope of the present application.

[0104] Optionally, to facilitate use and reduce costs, the length of the insulating substrate 120 can be set to between 300 mm and 800 mm, and the width can be set to between 5 mm and 12 mm.

[0105] Figure 10 A structural schematic diagram of a crack detection device provided by another embodiment of the present application.

[0106] As Figure 10As shown, in some optional embodiments, the sensing part 100 of the crack detection device 20 may further include an insulating protective layer 130. The insulating protective layer 130 is disposed on the side of the conductive layer 110 away from the insulating substrate 120. The insulating protective layer 130 can protect the conductive layer 110 from damage and prevent the external environment from affecting the conductivity of the conductive layer 110.

[0107] Optionally, the sides of the first contact 111a and the second contact 111b that are away from the insulating substrate 120 can both be exposed outside the insulating protective layer 130, which facilitates the access of external current.

[0108] Figure 11 This is a schematic diagram of the structure of a crack detection device provided in another embodiment of this application when used in a bearing assembly.

[0109] In some alternative embodiments, the crack detection device 20 may include a plurality of sensing units 100. Due to limitations in manufacturing process and cost, the lengths of the conductive layer 110 and the insulating substrate 120 of the sensing units 100 are limited. By providing a plurality of sensing units 100, the detectable range of the crack detection device 20 can be increased.

[0110] In some alternative embodiments, such as Figure 11 As shown, when the crack detection device 20 is installed on the bearing body 10, the multiple sensing units 100 of the crack detection device 20 can be arranged sequentially along the circumferential direction C of the bearing body 10. The orthogonal projections of the two first wires 111 of two adjacent sensing units on the circumferential direction C of the bearing body 10 on the axial direction of the bearing body 10 can be partially overlapped. This can avoid the occurrence of detection blind spots between two adjacent sensing units on the circumferential direction C of the bearing body 10, so that the effective detection area of ​​the crack detection device 20 can completely cover the preset detection range, and the preset detection range can be effectively detected.

[0111] Figure 12 This is a schematic diagram of the structure of a crack detection device provided in another embodiment of this application; Figure 13 This is a structural schematic diagram of a crack detection device provided in another embodiment of this application.

[0112] like Figure 12 As shown, in some optional embodiments, the crack detection device 20 may include multiple sensing units 100, which may be connected in series. The first wires 111 of the multiple sensing units 100 are connected end to end to form a test wire. When the crack detection device 20 is set on the bearing body 10, any crack that occurs at any position on the surface of the bearing body 10 within the arrangement range of the sensing units 100 will cause the test wire to break, preventing the external current from flowing through the test wire. Therefore, the crack detection device 20 provided in this application embodiment can effectively detect whether a crack has occurred within the arrangement range of the sensing units 100.

[0113] As shown in Figure 13 some alternative embodiments, the crack detection device 20 comprises a plurality of sensing units 100 which can be connected in parallel. When a crack occurs at any position on the surface of the bearing body 10 within the layout range of the sensing unit 100, the first wire 111 of the corresponding sensing unit will be broken. Through the plurality of sensing units 100 connected in parallel, not only can it be detected whether the bearing body 10 has a crack, but also the specific position of the crack on the bearing body 10 can be detected.

[0114] Please continue to refer to Figure 12 and Figure 13 In some alternative embodiments, the crack detection device 20 provided by the embodiments of the present application further comprises a measuring unit 200, which comprises a power supply module and a detection module. The first wire 111 is connected with the power supply module and the detection module through the first contact 111a and the second contact 111b, and forms a detection loop. In the detection loop, the power supply module supplies power to apply a voltage between the first contact 111a and the second contact 111b, and the detection module is used to detect the electrical parameter of the detection loop and determine whether the measured product has a crack according to the electrical parameter.

[0115] Optionally, the detection module is configured to detect the first current value flowing between the first contact 111a and the second contact 111b of the first wire 111. When it is detected that the first current value is less than a preset threshold current value and the duration of the first current value is greater than a predetermined time, it is determined that the measured product has a crack. When the crack detection device 20 is arranged on the bearing body 10, the detection module is configured to determine that the bearing body 10 has a crack when the first current value between the first contact 111a and the second contact 111b is less than the preset threshold current value and the duration of the first current value is greater than the predetermined time. The present application does not make a specific limitation on the predetermined time. Optionally, the predetermined time can be set to 3-5S.

[0116] The power module applies a voltage between the first contact 111a and the second contact 111b. If the first contact 111a and the second contact 111b are in communication, the power module, the first wire 111, and the test module form a detection loop, and the test module detects that the first current value between the first contact 111a and the second contact 111b flowing through the first wire 111 is a preset threshold current value. If the first wire 111 is broken due to the crack of the product under test, the detection loop is broken, and the test module detects that the first current value is zero. If the conductive layer 110 of the sensing part 100 includes a plurality of first wires 111, and part of the first wires 111 are broken due to the crack of the product under test, the resistance of the conductive layer 110 increases, and the test module detects that the first current value between the first contact 111a and the second contact 111b flowing through the first wire 111 is less than the preset threshold current value and is not zero.

[0117] The condition for judging that the product under test has a crack includes the duration of the first current value, which can reduce or avoid other factors that cause the first current value to jump temporarily from being misjudged as the product under test having a crack, thereby improving the detection accuracy of the crack detection device 20.

[0118] In some optional embodiments, the crack detection device 20 can further include an alarm, which is in communication connection with the detection module. The alarm is configured to issue an alarm signal when the product under test has a crack. Optionally, the alarm is configured to issue an alarm signal when the first current value between the first contact 111a and the second contact 111b flowing through the first wire 111 is less than the preset threshold current value and the duration of the first current value is greater than a predetermined time. Optionally, the alarm signal can have various forms, such as text, sound, light, etc. By setting the alarm, the staff can be reminded to find the crack state of the product under test in time.

[0119] In some optional embodiments, the measuring part 200 further includes a control box. The power module and the test module can be integrated in a control box. The control box can be provided with a first electrode 201 and a second electrode 202 connected with the power module. The first contact 111a is electrically connected with the first electrode 201, and the second contact 111b is electrically connected with the second electrode 202. Optionally, the first electrode 201 can be a positive electrode, and the second electrode 202 can be a negative electrode.

[0120] As Figure 12As shown, optionally, the crack detection device 20 includes N sensing units 100. The second contact 111b of the (i-1)th sensing unit 100 can be electrically connected to the first contact 111a of the ith sensing unit 100. The first contact 111a of the ith sensing unit 100 is electrically connected to the first electrode 201, and the second contact 111b of the Nth sensing unit 100 is electrically connected to the second electrode 202, thereby realizing the series connection of the N sensing units 100 and forming a detection loop with the measuring unit 200. Here, N and i are both integers greater than or equal to 2, and i ≤ N.

[0121] like Figure 13 As shown, optionally, the crack detection device 20 includes N sensing units 100. A first electrode 201 and at least N second electrodes 202 can be disposed on the control box. The first contacts 111a of the N sensing units 100 are all electrically connected to the first electrode 201, and the second contacts 111b of the N sensing units 100 are electrically connected one-to-one to the N second electrodes 202, thereby realizing the parallel connection of the N sensing units 100 and forming N detection loops with the measuring unit 200. Where N and i are both integers greater than or equal to 2, and i ≤ N.

[0122] In summary, the crack detection device 20 provided in this application embodiment can detect whether cracks have occurred on the surface of the bearing body 10, and has the advantages of high detection accuracy, high efficiency, and timely detection.

[0123] The embodiments described above are not exhaustive, nor do they limit the application to the specific embodiments described herein. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A bearing assembly, characterized in that, include: Bearing body; A crack detection device is disposed on the bearing body. The crack detection device includes a sensing unit, which includes a conductive layer that is insulated from the bearing body. The conductive layer includes a first wire and a plurality of second wires. The first wire extends a predetermined length in the circumferential direction of the bearing body and has first contacts and second contacts that are spaced apart. The plurality of second wires are spaced apart in the length direction of the first wire. Each second wire intersects with the first wire and divides the first wire into multiple segments. The wire diameter of the second wire is greater than that of the first wire. The bearing body has both a safe state and a cracked state. In the safe state, the first contact is connected to the second contact, and external current can be transmitted between the first contact and the second contact; In the cracked state, the bearing body develops a crack, the first wire breaks at the location of the crack in the bearing body, and the first contact and the second contact are disconnected.

2. The bearing assembly according to claim 1, characterized in that, One of the plurality of second wires is connected to a first contact of the first wire, and the remaining second wires are connected to a second contact on the first wire.

3. The bearing assembly according to claim 1, characterized in that, The first conductor is provided in multiple ways, and the multiple first conductors are distributed at intervals in the direction intersecting with the length direction of the first conductor. Each second conductor is connected to the first conductor that intersects with it.

4. The bearing assembly according to claim 1, characterized in that, The sensing unit further includes an insulating substrate, and the conductive layer is disposed on one side surface of the insulating substrate in the thickness direction. The sensing unit is insulatedly connected to the bearing body through the insulating substrate.

5. The bearing assembly according to claim 4, characterized in that, A reinforcing groove is provided on the insulating substrate, the reinforcing groove being formed by an inward recess from the edge of the insulating substrate; and / or The insulating substrate is provided with reinforcing holes, which are spaced apart at the edge of the insulating substrate.

6. The bearing assembly according to claim 4, characterized in that, The insulating substrate is a flexible substrate that can be bent.

7. The bearing assembly according to claim 4, characterized in that, The sensing unit further includes an insulating protective layer, which is disposed on the side of the conductive layer away from the insulating substrate. The sides of the first contact and the second contact away from the insulating substrate are both exposed outside the insulating protective layer.

8. The bearing assembly according to any one of claims 1-7, characterized in that, The crack detection device further includes a measuring unit, which includes a power supply module and a detection module. The power supply module is used to apply voltage between the first contact and the second contact. The detection module is configured to detect a first current value between the first contact and the second contact. When the detected first current value is less than a preset threshold current value and the duration of the first current value is greater than a predetermined time, it is determined that a crack has occurred in the bearing body.

9. The bearing assembly according to claim 8, characterized in that, The crack detection device also includes an alarm, which is communicatively connected to the detection module. The alarm is configured to issue an alarm signal when the first current value is less than a preset threshold current value and the duration of the first current value is greater than a predetermined time.

10. The bearing assembly according to claim 1, characterized in that, The crack detection device includes multiple sensing units, which are connected in series or in parallel.

11. The bearing assembly according to claim 1, characterized in that, The bearing body includes an inner ring and an outer ring that rotate together. The sensing element is disposed on the radially outer circumferential surface of the outer ring, and / or, The sensing element is disposed on the circumferential surface of the radially inner side of the inner ring.

12. The bearing assembly according to claim 1, characterized in that, The first wire is arranged around the entire circumference of the bearing body or in a partial manner.

13. The bearing assembly according to claim 1, characterized in that, The crack detection device includes a plurality of sensing units, which are arranged sequentially along the circumferential direction, and the first wires of two adjacent sensing units in the circumferential direction overlap in the axial projection of the bearing body.

14. A wind turbine generator set, characterized in that, Includes the bearing assembly as described in any one of claims 1 to 13.

15. The wind turbine generator set according to claim 14, characterized in that, The wind turbine generator set also includes a hub and blades, which are connected by the bearing assembly; And / or, the wind turbine generator set further includes a tower and a nacelle, the tower and the nacelle being connected via the bearing assembly.

16. A crack detection device, characterized in that, Includes a sensing unit, said sensing unit comprising: Insulating substrate; A conductive layer is disposed on the insulating substrate. The conductive layer includes a first conductor and a plurality of second conductors. The first conductor extends along the length direction of the insulating substrate and has first contacts and second contacts distributed at intervals. The plurality of second conductors are distributed at intervals along the length direction of the first conductor. Each second conductor intersects with the first conductor and divides the first conductor into multiple segments. The wire diameter of the second conductor is greater than that of the first conductor.

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