Loosening and fracture detection equipment for high-strength bolt

Abstract

The utility model discloses high-strength bolt looseness and fracture detection equipment, and belongs to the technical field of detection equipment. The high-strength bolt looseness and fracture detection equipment comprises a closed circuit and a detection module connected to the closed circuit, the closed circuit comprises a connecting wire, and the connecting wire is tightened and fixed to a nut to be detected; the utility model has the advantages that the looseness or breakage of the bolt can be conveniently found in time, and the inspection and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a detection device for high-strength bolt loosening and fracture. Background Art

[0002] During the operation of a wind turbine, with the vibration and sway of the unit, it is extremely easy to cause the loosening and fracture of high-strength bolts.

[0003] If loosening or fracture occurs, it can only be observed during inspections or maintenance by checking the anti-loosening line or torque verification to detect bolt defects. At the same time, it will cause varying degrees of damage to the surrounding bolts, which is not conducive to improving the maintenance efficiency of wind turbines. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that it is not easy to detect the loosening and fracture of high-strength bolts in wind turbines in the prior art, and to propose a detection device for high-strength bolt loosening and fracture.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A detection device for high-strength bolt loosening and fracture, including a closed circuit and a detection module connected to the closed circuit. The closed circuit includes connecting wires, and the connecting wires are tightened and fixed on the nut to be detected.

[0007] Further, the connecting wires include detection segments and connecting segments arranged alternately, and the detection segments are fixed on the surface of the nut.

[0008] Further, the detection segments are wound around the surface of the nut.

[0009] Further, the detection segments include a vertical part and a horizontal part forming an L shape. The vertical part is fixed on the surface of the nut, and the horizontal part is fixed on the surface of the mounting plate of the nut.

[0010] Further, a first hook is provided on the nut, and the detection segments are wound and fixed on the nut through the first hook.

[0011] Further, a second hook is provided on the surface of the mounting plate of the nut, and the detection segments are wound and fixed on the surface of the mounting plate of the nut through the second hook.

[0012] Further, after the detection segments are wound out from the second hook, they are wound around the surface of the nut in the loosening direction of the nut and then wound onto the first hook.

[0013] Further, the closed circuit further includes a power converter, an ADC module, a single-chip microcomputer, and a circuit breaker switch.

[0014] Compared with the prior art, the utility model provides a high-strength bolt loosening and fracture detection device, which has the following beneficial effects:

[0015] When the high-strength bolt loosening and fracture detection device of the utility model is in use, the connecting wire in the closed circuit is fixed on the nut of the bolt to be detected. The detection module is used to detect the connection state of the whole circuit. When the bolt to be detected is loose or fractured, the nut will displace, driving the connecting wire to break. When the wire breaks, the detection module detects that the circuit is disconnected and sends a signal to notify the staff. The staff can obtain the state change of the bolt in time. Compared with the prior art, the risk of major accidents such as bolt loosening and fracture caused by careless inspection by personnel is reduced, and at the same time, the inspection and maintenance cost is reduced.

[0016] Other advantages, objectives and features of the utility model will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structural flow of the utility model;

[0018] Figure 2 is a schematic diagram of the installation effect of the detection line of the utility model;

[0019] Figure 3 is of the utility model Figure 2 Schematic enlarged view of the structure of part A;

[0020] Figure 4 is the second schematic diagram of the structure of the detection part of the utility model;

[0021] Figure 5 is the third schematic diagram of the structure of the detection part of the utility model;

[0022] Figure 6 is the schematic diagram of the hook structure of the utility model;

[0023] Figure 7 is of the utility model Figure 6 Schematic enlarged view of the structure of part B.

[0024] In the figure:

[0025] 1. Power converter; 2. ADC module; 3. Single-chip microcomputer; 4. Open-circuit switch; 5. Connecting wire; 50. Detection module; 6. Tower barrel; 7. Base; 8. Bolt; 9. Nut; 10. Detection section; 11. Connection section; 12. Vertical part; 13. Horizontal part; 14. First hook; 15. Second hook. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Refer to Figures 1-7 , the high-strength bolt loosening and fracture detection device of the present invention includes a closed circuit and a detection module 50 connected to the closed circuit. The closed circuit includes a power converter 1, an ADC module 2, a single-chip microcomputer 3, a break switch 4, and a connecting wire 5. After the break switch 4 is turned on, the single-chip microcomputer 3, the ADC module 2, and the power converter 1 are connected through the connecting wire 5 to form a closed circuit. The detection module 50 is connected to the closed circuit to detect the on-state of the detection circuit.

[0028] Among them, the power converter 1 is a DC / DC converter, the ADC module 2 is an analog-to-digital conversion ADC module, the single-chip microcomputer 3 is a single-chip microcomputer MCU, the detection module 50 is a KL1104 module, the detection module 50 is connected to an external PLC (the controller of the wind turbine), and the connecting wire 5 can be selected as an enameled wire.

[0029] This application takes the high-strength bolts 8 and nuts 9 used to fix the tower barrel 6 and the base 7 on the wind turbine as an example.

[0030] The connecting wire 5 is tightened and fixed on the nut 9 to be detected. During installation, the connecting wire 5 is fixed on the nut 9 by gluing or winding. The two ends of the connecting wire 5 are connected to the closed circuit, and it is kept in a tightened state during connection.

[0031] When the nut 9 becomes loose or the bolt 8 breaks, the nut 9 will rotate in the loosening direction or undergo other forms of displacement, driving the connecting wire 5 to break. When it breaks, the ADC module 2 cannot convert the analog signal into a digital signal, the single-chip microcomputer 3 cannot drive the switch, and the external PLC cannot detect a 24V signal through the detection module 50, thereby reporting a bolt loosening warning.

[0032] The connecting wire 5 includes a detection section 10 and a connecting section 11 arranged alternately. The detection section 10 is fixed on the surface of the nut 9. When the nut 9 undergoes displacement, the connecting wire 5 is driven to break through the detection section 10.

[0033] In this application, the device can be arranged on a single bolt 8, or all adjacent bolts 8 can be connected in series through a connecting wire 5. For example, for the bolts 8 used for fixing between the tower barrel 6 and the base 7, all the bolts 8 in a circle on the base 7 can be connected in series. Specifically, a connecting wire 5 is used to bypass each nut 9 and fixed to the nut 9. Among them, the middle part of the connecting wire 5 consists of a detection section 10 and a connection section 11. The two ends of the detection section 10 are connected to the connection section 11, and the two ends of the connection section 11 are connected to the detection section 10. The two ends of the connecting wire 5 are then connected to a closed circuit.

[0034] The detection section 10 is wound around the surface of the nut 9 for fixing the detection section 10, and it can also be reinforced with glue to keep a stable connection between the detection section 10 and the nut 9.

[0035] The detection section 10 can be Figure 3 as shown, wound around the surface of the nut 9 (it can be wound several times), or Figure 4 as shown, adhesively fixed to the surface of the nut 9 in a U-shaped form, or Figure 5 as shown, fixed to the surfaces of the nut 9 and the mounting plate in a shape similar to a lock washer wire.

[0036] The detection section 10 includes a vertical portion 12 and a horizontal portion 13 forming an L shape. The vertical portion 12 is fixed to the surface of the nut 9, and the horizontal portion 13 is fixed to the surface of the mounting plate of the nut 9. Here, the surface of the mounting plate refers to the flange surface at the bottom of the tower barrel 6. The vertical portion 12 and the horizontal portion 13 form an L shape identical to the shape of the lock washer wire. The vertical portion 12 and the horizontal portion 13 are formed by bending the detection section 10 by 90 degrees and are fixedly installed at the corner where the side wall of the nut 9 is connected to the surface of the mounting plate.

[0037] When the nut 9 is displaced, it drives the vertical portion 12, and a break occurs between the vertical portion 12 and the horizontal portion 13.

[0038] A first hook 14 is welded on the nut 9, and the detection section 10 of the connecting wire 5 is wound and fixed on the nut 9 through the first hook 14. Both the first hook 14 and the second hook 15 are formed by two straight rods in a T-shaped structure. After the detection section 10 of the connecting wire 5 is wound around the first hook 14 and the second hook 15, it can prevent the connecting wire 5 from automatically detaching.

[0039] Compared with fixing by glue or winding around the surface of the nut 9, winding the connecting wire 5 around the first hook 14 is more convenient to operate.

[0040] The surface of the mounting plate of the nut 9 is welded with a second hook 15. The detection section 10 is wound and fixed on the surface of the mounting plate of the nut 9 through the second hook 15. Similarly, compared with fixing by glue, fixing the detection section 10 of the connecting wire 5 on the surface of the mounting plate through the second hook 15 is more convenient to operate.

[0041] After the detection section 10 is wound out from the second hook 15, it is wound around the surface of the nut 9 in the loosening direction of the nut 9 and then wound onto the first hook 14. This situation is mainly applied to the case where the connecting wire 5 is wound around the nut 9 (it can be wound several times). When the mounting nut 9 is turned, the distance between the first hook 14 and the second hook 15 should be made as small as possible. If the detection section 10 between the first hook 14 and the second hook 15 is not the minimum value, when the detection section 10 is wound around the first hook 14 and the second hook 15, it can first be wound around in the loosening direction of the nut 9 for one circle in the middle, so that when the nut 9 loosens, it can better drive the detection section 10 to break.

[0042] When the connecting wire 5 is wound and fixed on multiple nuts 9, it can be wound from any direction as long as it is kept in a taut state.

[0043] Working principle: When in use, this device is arranged on the wind turbine generator set, and an external power supply is used. The detection module 50 is installed on the PLC controller of the wind turbine generator set, and the connecting wire 5 is wound and fixed on the nut 9 and the mounting plate.

[0044] When the nut 9 loosens or the bolt 8 breaks, the nut 9 drives the connecting wire 5 to break. When it breaks, the ADC module 2 cannot convert the analog signal into a digital signal, the single-chip microcomputer 3 cannot drive the switch, and the external PLC cannot detect the 24V signal through the detection module 50, thus reporting a bolt loosening warning. The staff can detect the corresponding wind turbine generator set according to the signal, repair the bolt, and reconnect the connecting wire 5.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

[0046] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0047] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. High-strength bolt loosening and fracture detection equipment, characterized in that: It comprises a closed circuit and a detection module (50) connected to the closed circuit, wherein the closed circuit comprises a connecting wire (5), and the connecting wire (5) is tightened and fixed on a nut (9) to be detected.

2. The high-strength bolt loosening and fracture detection device according to claim 1 is characterized in that: The connecting wire (5) comprises detection sections (10) and connection sections (11) which are arranged in a staggered manner, and the detection sections (10) are fixed on the surface of the nut (9).

3. The high-strength bolt loosening and fracture detection device according to claim 2 is characterized in that: The detection section (10) is wound around the surface of the nut (9).

4. The high-strength bolt loosening and fracture detection device according to claim 2 is characterized in that: The detection section (10) comprises a vertical portion (12) and a horizontal portion (13) forming an L-shape, wherein the vertical portion (12) is fixed on the surface of the nut (9), and the horizontal portion (13) is fixed on the surface of a mounting plate of the nut (9).

5. The high-strength bolt loosening and fracture detection device according to claim 4 is characterized in that: The nut (9) is provided with a first hook (14), and the detection section (10) is wound and fixed on the nut (9) through the first hook (14).

6. The high-strength bolt loosening and fracture detection device according to claim 5 is characterized in that: A second hook (15) is provided on the surface of the mounting plate of the nut (9), and the detection section (10) is wound around and fixed to the surface of the mounting plate of the nut (9) via the second hook (15).

7. The high-strength bolt loosening and fracture detection device according to claim 6 is characterized in that: The detection section (10) is wound around the second hook (15), is wound around the surface of the nut (9) along the loosening direction of the nut (9), and is then wound around the first hook (14).

8. The high-strength bolt loosening and fracture detection device according to claim 1 is characterized in that: The closed circuit further comprises a power converter (1), an ADC module (2), a single chip computer (3), and a circuit breaker (4).

Images