CN213632633U

CN213632633U - Bolt looseness detection device

Info

Publication number: CN213632633U
Application number: CN202022766545.7U
Authority: CN
Inventors: 白雪
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-07-06
Anticipated expiration: 2030-11-25

Abstract

The utility model relates to a bolt looseness detection device, which comprises a shell, wherein a relative movement device is arranged in the shell, and a sensor for detecting movement is arranged on the relative movement device; the relative motion device comprises a stator and a rotor, wherein the stator and the rotor are in relative positions with the shell, the rotor is rotatably connected to the stator, the rotor is provided with viscose glue for fixing a screw to be detected, and the sensor is connected with the rotor. Through structural design, the nut and the screw are converted into relative motion of a rotor and a stator in the relative motion mechanism in a loosening manner, and the mechanical motion of response is collected through a sensor to form an electric signal.

Description

Bolt looseness detection device

Technical Field

The utility model belongs to the technical field of mechanical equipment anomaly detection technique and specifically relates to a bolt looseness detection device.

Background

As a common fastening device, bolts and nuts are used in large-scale projects such as railway transportation, aerospace, wind power generation, machining, ship and ocean, the fastening state of the bolts at key positions determines the health and safety state of the projects, and once the loosening phenomenon occurs, huge potential safety hazards can be caused.

Generally, the failure of the bolt is mainly fracture and loosening, wherein the loosening is the most common problem. At present, a plurality of methods for detecting the bolt looseness exist, such as simple marking by means of marking, pretightening force detection, nonlinear characteristic detection of a connecting system, ultrasonic characteristic detection, computer vision detection and the like. Each of these methods has advantages, but the principle is complex and is limited by cost, so that the methods are not suitable for being deployed in actual production, and are particularly not suitable for being applied to a scene in which a large number of bolts need to be detected.

SUMMERY OF THE UTILITY MODEL

The applicant aims at the defects in the prior art and provides a bolt looseness detection device with a reasonable structure, so that the bolt looseness detection device which is convenient to deploy in a large scale is safe for maintaining the production safety of the wind power industry.

The utility model discloses the technical scheme who adopts as follows:

a bolt looseness detection device comprises a shell, wherein a relative movement device is arranged in the shell, and a sensor is arranged on the relative movement device;

the relative movement device comprises a stator and a rotor, wherein the stator is in a relative position with the shell, the rotor is rotationally connected to the stator, the rotor is provided with a bonding point for fixing a bolt to be detected, and the sensor is connected with the rotor; the shell is used for contacting with the nut to be detected, and the bonding point is used for contacting with the screw to be detected.

The side wall of the shell is provided with a positioning groove, and the outline of the outer edge of the stator is provided with a stator positioning pin embedded into the positioning groove.

The shell is a shell-drawing prism with an open end, the open end of the shell is used for accommodating a screw to be detected, and an inner cavity of the shell-drawing prism is matched with the outer contour of the nut.

The length of constant head tank is less than the axial length of shell, and constant head tank one end extends to the roof of shell department.

And one end of one positioning groove on the shell, which is close to the top wall of the shell, is provided with a signal connector for outputting a signal sent by the sensor.

And the shell is in interference fit or transition fit with the nut corresponding to the screw to be detected.

The sensor includes a sensor input shaft on a side of the rotor facing away from the bond, the sensor input shaft in signal communication with the sensor.

The utility model has the advantages as follows:

the utility model has the advantages of compact and reasonable structure, convenient operation through structural design, turns into the relative motion of rotor and stator among the relative motion mechanism with the not hard up of screw rod to gather out the mechanical motion of responding through the sensor, form the signal of telecommunication.

The utility model discloses can be used to the not hard up detection of screw rod among the extensive screw rod connection, the fastening device such as wind power equipment, electric wire netting equipment, construction, track equipment. Through means of low-pass filtering and step signal detection, the screw looseness of 0.5 degrees can be detected.

The utility model discloses a design, manufacturing and installation deployment are connected by the signal cable, only based on the shape after screw rod, nut installation, do not rely on specific structure by the mechanism of fastening, have extremely strong commonality. The device has the characteristics of simple structure, strong reliability and high measurement precision, and shows good economical efficiency and is convenient to maintain under the scene of large-scale screw loosening detection.

Drawings

Fig. 1 is a schematic structural view of a screw nut to which the present invention is applied.

Fig. 2 is a perspective view of the relative movement device of the present invention.

Fig. 3 is a perspective view of another perspective view of the relative movement apparatus of the present invention.

Fig. 4 is a schematic structural view of the rotor of the present invention.

Fig. 5 is a schematic structural view of another view angle of the rotor according to the present invention.

Fig. 6 is a schematic diagram of the relative movement mechanism of the device of the present invention covering the screw rod to be detected.

Fig. 7 is a schematic bottom view of the housing of the present invention after the relative movement mechanism is assembled.

Fig. 8 is a schematic diagram of the utility model of which the whole cover is covered on the screw rod and the nut to perform the detection work.

Wherein: 1. a screw; 2. a nut; 3. a stator positioning pin; 4. a sensor input shaft; 5. A sensor; 6. a stator; 7. a rotor; 8. a bond point; 9. a housing; 10. a signal connector; 11. and (6) positioning a groove.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 8, the bolt loosening detection device of the present embodiment includes a housing 9, a relative movement device is disposed in the housing 9, and a sensor 5 is disposed on the relative movement device;

the relative movement device comprises a stator 6 and a rotor 7, wherein the stator 6 and the rotor 7 are in relative positions with the shell 9, the rotor 6 is rotationally connected with the stator, the rotor 7 is provided with viscose glue for fixing the screw rod 1 to be detected, and the sensor 5 is connected with the rotor 7; the shell 9 is used for contacting the nut 2 to be detected, and the bonding point 8 is used for contacting the screw 1 to be detected

The side wall of the shell 9 is provided with a positioning groove 11, and the outline of the outer edge of the stator 6 is provided with a stator positioning pin 3 embedded into the positioning groove 11.

The shell 9 is a shell-drawing prism with an open end, the open end of the shell 9 is used for accommodating the screw rod 1 to be detected, and an inner cavity of the shell-drawing prism is matched with the outer contour of the nut 2.

The length of the positioning groove 11 is smaller than the axial length of the shell 9, and one end of the positioning groove 11 extends to the top wall of the shell 9.

One end of one positioning groove 11 on the shell 9 close to the top wall of the shell 9 is provided with a signal connector 10 for outputting signals sent by the sensor 5.

The shell 9 is in interference fit or transition fit with the nut 2 corresponding to the screw 1 to be detected.

The sensor 5 comprises a sensor input shaft 4 on the side of the rotor 7 facing away from the bond point 8, the sensor input shaft 4 being in signal communication with the sensor 5.

The utility model discloses a concrete structure and theory of operation as follows:

fig. 1 shows a nut 2 structure of a screw 1, which is suitable for the present invention, as shown in fig. 2 and fig. 3, which are schematic structural diagrams of a relative movement mechanism of the present invention, and fig. 6 and fig. 7 are schematic structural diagrams of a housing 9 added on the basis of the relative movement mechanism.

The detection device consists of a stator 6, a rotor 7, a shell 9 and a sensor 5; the shell 9 is the open structure of regular hexagon lower extreme, and the 9 internal surfaces of shell have certain toughness, can be the rubber material, and the size slightly is less than or equal to 2 overall dimension of nut, makes shell 9 and nut 2 form interference fit or closely cooperate during the assembly to make shell 9 and nut 2 static relatively.

The stator 6 and the rotor 7 form a relative movement mechanism. The rotor 7 is provided with a sensor input shaft 4, the sensor 5 is fixed on the stator 6, the relative rotation of the rotor 7 and the stator 6 is input to the sensor 5 through the sensor input shaft 4, and the sensor 5 converts the relative rotation into an electric signal or a digital signal. The sensor 5 can be an analog quantity sensor or a digital signal sensor, and both of them are connected with a signal cable by a signal connector 10 arranged on the shell 9 to realize signal output.

On the back of the relative movement mechanism, the rotor 7 and the sensor input shaft 4 are of an integral structure, and meanwhile, the rotor 7 is fixedly bonded with the upper end face of the screw rod 1 to be detected through an industrial double-sided adhesive tape, so that the sensor input shaft 4 and the screw rod 1 to be detected move synchronously; the stator positioning pin 3 on the relative movement mechanism is matched with the shell 9, so that the stator 6 of the relative movement mechanism and the shell 9 move synchronously; the stator positioning pin 3 can move freely on the positioning groove 11 of the shell 9, so that the detection device is suitable for the scenes that the heights of the screw rod 1 and the nut 2 are different. The inner surface of the shell 9 is attached to the surface of the nut 2, so that the shell 9 and the nut 2 move synchronously, and the stator 6 and the nut 2 move synchronously.

Taking the commonly used D-shaft as an example, the D-shaft passes through the center of the stator 6 and is tightly fitted with the sensor 5. The rotor 7 is bonded on the end face of the screw rod 1 through a bonding point 8, so that the rotor 7 and the screw rod 1 are relatively static; further, the relative rotation of the nut 2 and the screw 1 is converted into the relative rotation of the stator 6 and the rotor 7; the sensor 5 inputs the relative movement angle alpha of the screw 1 and the nut 2 through the sensor input shaft 4, and then measures the relative movement condition of the screw 1 and the nut 2.

The signal of the sensor 5 in this embodiment is led out by a signal connector 10 on the housing 9 and delivered to a superior signal processing module.

The detection device of the embodiment obtains the loosening state of the screw by converting the relative motion of the screw 1 and the nut 2 into the relative motion of the rotor 7 and the stator 6 in the device. And the later stage is assisted by a signal processing technology, so that the detection precision can be greatly improved.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.

Claims

1. The utility model provides a bolt looseness detection device which characterized in that: the device comprises a shell (9), wherein a relative movement device is arranged in the shell (9), and a sensor (5) is arranged on the relative movement device;

the relative movement device comprises a stator (6) and a rotor (7), wherein the stator (6) and the shell (9) keep relative positions, the rotor (7) is rotatably connected to the stator (6), a bonding point (8) for fixing a bolt to be detected is arranged on the rotor (7), and the sensor (5) is connected with the rotor (7); the shell (9) is used for being in contact with the nut (2) to be detected, and the bonding point (8) is used for being in contact with the screw (1) to be detected.

2. A bolt loosening detection device as defined in claim 1, wherein: be equipped with constant head tank (11) on the lateral wall of shell (9), be equipped with stator locating pin (3) of embedding constant head tank (11) on the outer fringe profile of stator (6).

3. A bolt loosening detection device as defined in claim 2, wherein: the shell (9) is a shell-drawing prism with an open end, the open end of the shell (9) is used for accommodating the screw (1) to be detected, and an inner cavity of the shell-drawing prism is matched with the outer contour of the nut (2).

4. A bolt loosening detection device as defined in claim 2, wherein: the length of the positioning groove (11) is smaller than the axial length of the shell (9), and one end of the positioning groove (11) extends to the top wall of the shell (9).

5. A bolt loosening detection device as defined in claim 2, wherein: one end of one positioning groove (11) on the shell (9) close to the top wall of the shell (9) is provided with a signal connector (10) for outputting signals sent by the sensor (5).

6. A bolt loosening detection device as defined in claim 3, wherein: the shell (9) is in interference fit or transition fit with the nut (2) corresponding to the screw (1) to be detected.

7. A bolt loosening detection device as defined in claim 1, wherein: the sensor (5) comprises a sensor input shaft (4) located on the side of the rotor (7) facing away from the bond point (8), the sensor input shaft (4) being in signal communication with the sensor (5).