Wireless passive bolt pre-tightening force detection device

Abstract

The utility model provides a wireless passive bolt pretightening force detection device, which comprises a gasket type surface acoustic wave temperature strain composite sensor, a reader and a reader antenna, and is characterized in that the gasket type surface acoustic wave temperature strain composite sensor comprises a surface acoustic wave gas sensitive sensor and a gasket; the gasket is arranged between the bolt and the connected piece, the surface acoustic wave gas-sensitive sensor is fixedly arranged in a stress concentration area on the gasket, and the reader is in signal connection with the surface acoustic wave gas-sensitive sensor through the reader antenna. The device is simple in structure and convenient to operate, the surface acoustic wave gas-sensitive sensor is in direct contact with the gasket and is in signal connection with the reader, the measured temperature and strain information can be ensured to be accurate and reliable, wireless passive transmission of the temperature and strain information can be realized, the safety and reliability of bolt connection can be further ensured, and the service life of the device is prolonged. The working efficiency of bolt detection is improved, and the inspection cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a wireless passive bolt preload force detection device, in particular to a wireless passive bolt preload force detection device based on a gasket type surface acoustic wave temperature strain composite sensor. Background Art

[0002] Bolt connection is the most widely used connection method in industrial assembly. Its purpose is to generate reliable clamping force between connected parts through bolt preload to achieve a stable connection. Bolt preload directly affects the reliability of assembly connection. For large industrial fields such as civil engineering, wind turbines and space launch towers, the reliability requirements of fastened connections are high, and real-time and accurate monitoring of bolt preload is required.

[0003] The common bolt preload measurement methods in engineering are: (1) the method of attaching strain gauges to the bolt rod; (2) the ultrasonic method; (3) the torque wrench measurement method. These methods have the disadvantages of requiring the placement of strain gauge leads, complex structures, being greatly affected by the external environment, and requiring irregular calibration and maintenance, making it difficult to accurately and reliably monitor the bolt preload in real time. Therefore, it is urgent to develop a wireless passive bolt preload detection device to accurately monitor the bolt preload at key joints in real time. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the utility model is to provide a wireless passive bolt preload force detection device.

[0005] The wireless passive bolt preload detection device provided by the utility model comprises a gasket-type surface acoustic wave temperature strain composite sensor, a reader and a reader antenna, wherein the gasket-type surface acoustic wave temperature strain composite sensor comprises a surface acoustic wave gas sensor and a gasket;

[0006] The gasket is arranged between the bolt and the connected member, the surface acoustic wave gas sensor is fixedly arranged at the stress concentration area on the gasket, and the reader is connected to the surface acoustic wave gas sensor signal through the reader antenna.

[0007] Preferably, the reader is connected to the reader antenna via an antenna feeder;

[0008] The reader is used to send a query signal through a reader antenna, and send the query signal to the surface acoustic wave gas sensor.

[0009] Preferably, the surface acoustic wave gas sensor comprises a sensor chip, a sensor antenna and a PCB pad;

[0010] The sensor chip and the sensor antenna are both fixed on the PCB pad, and the sensor chip and the sensor antenna are electrically connected;

[0011] The sensor chip is used to receive the inquiry signal of the reader and generate an echo signal for reception by the reader antenna.

[0012] Preferably, the sensor chip is fixed on the PCB pad by hard glue, and is bound to the PCB pad by gold wire.

[0013] Preferably, the sensor chip comprises a surface acoustic wave resonator.

[0014] Preferably, the surface acoustic wave gas sensor is fixed to the edge of the gasket by adhesive.

[0015] Preferably, a notch is provided on the outer edge of the gasket to form a monitoring point, and the surface acoustic wave gas sensor is installed in the monitoring point.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model has a simple structure and is easy to operate. It can ensure the accuracy and reliability of the measured temperature and strain information by directly contacting the gasket with the surface acoustic wave gas sensor and connecting it with the reader signal. It can also realize wireless passive transmission of temperature and strain information, further ensure the safety and reliability of the bolt connection, improve the work efficiency of bolt detection, and reduce inspection costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the gasket-type surface acoustic wave temperature-strain composite sensor in the utility model;

[0020] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0021] The figure shows:

[0022] Sensor chip 1 Antenna feed line 6

[0023] Sensor antenna 2 Reader antenna 7

[0024] Gasket 3 Query signal 8

[0025] Bolt 4 Echo signal 9

[0026] Reader 5 DETAILED DESCRIPTION

[0027] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0028] The utility model discloses a wireless passive bolt preload force detection device, which is based on a gasket-type surface acoustic wave temperature-strain composite sensor, can ensure that the measured temperature and strain information are accurate and reliable, and can realize wireless passive transmission of temperature and strain information, which can further ensure the safety and reliability of bolt connections, improve the working efficiency of bolt detection, and reduce inspection costs.

[0029] According to the wireless passive bolt preload detection device provided by the utility model, Figure 1 , Figure 2 As shown, it includes a gasket-type surface acoustic wave temperature strain composite sensor, a reader 5 and a reader antenna 7, as shown Figure 1 As shown, the gasket-type surface acoustic wave temperature-strain composite sensor comprises a surface acoustic wave gas sensor and a gasket 3; the gasket 3 is arranged between the bolt 4 and the connected member, the surface acoustic wave gas sensor is fixedly arranged in the stress concentration area on the gasket 3, the gasket-type surface acoustic wave temperature-strain composite sensor is formed by fixing the surface acoustic wave gas sensor to the stress concentration area at the edge of the gasket 3 by an adhesive, the strain and temperature value of the gasket 3 are detected by the surface acoustic wave gas sensor, and the reader 5 determines the change of the bolt preload according to the detection signal of the sensor;

[0030] The reader 5 is connected to the surface acoustic wave gas sensor signal through the reader antenna 7. The reader 5 receives the temperature and strain signals of the gasket edge of the gasket-type surface acoustic wave temperature-strain composite sensor through the reader antenna 7. The reader 5 performs signal processing according to the detection signal to determine the change information of the bolt preload. Specifically, the reader 5 is connected to the reader antenna 7 through the antenna feeder 6; the reader 5 is used to send the query signal 8 through the reader antenna 7, and send the query signal 8 to the surface acoustic wave gas sensor.

[0031] like Figure 1As shown, the surface acoustic wave gas sensor includes a sensor chip 1, a sensor antenna 2 and a PCB pad; the sensor chip 1 eliminates the mutual interference of temperature and strain by differential compensation, and realizes the simultaneous measurement of gasket temperature and strain within the temperature and strain range borne by the substrate material. Preferably, the sensor chip 1 is fixed on a 1mm thick PCB pad by hard glue, and then bound to the PCB pad by gold wire to realize electrical connection with the sensor antenna 2. The sensor chip 1 and the sensor antenna 2 are both fixed on the PCB pad, and the sensor chip 1 and the sensor antenna 2 are electrically connected; the sensor chip 1 is used to receive the query signal 8 of the reader 5, and generate an echo signal 9 for reception by the reader antenna 7.

[0032] The surface acoustic wave gas sensor is fixed to the edge of the gasket 3 by an adhesive to directly sense the temperature and strain information of the gasket edge. The outer edge of the gasket 3 is provided with a notch to form a monitoring point, and the surface acoustic wave gas sensor is installed in the monitoring point.

[0033] The sensor chip 1 converts the electromagnetic wave signal of the query signal 8 into a mechanical wave, namely, a surface acoustic wave, which propagates inside the sensor chip 1. After the surface acoustic wave senses the gasket temperature and strain information, the wave is converted into an electromagnetic wave again by the passive sensor chip 1 and wirelessly transmitted through the sensor antenna 2 to generate an echo signal 9. The echo signal 9 is received by the reader antenna 7 and transmitted to the reader 5. The reader 5 analyzes the parameters of the echo signal 9 and obtains the bolt preload state information, thereby realizing wireless passive detection of the bolt preload.

[0034] Example 1

[0035] This embodiment discloses a wireless passive bolt preload detection device based on a gasket-type surface acoustic wave temperature strain composite sensor. Figure 1 As shown, the gasket type surface acoustic wave temperature strain composite sensor includes a sensor antenna 2, a sensor chip 1 and a gasket 3, wherein the sensor chip 1 is a surface acoustic wave resonator, which is a passive device, electrically connected to the sensor antenna 2, and is excited to vibrate by the received radio frequency signal. In the process of bolt preload detection, the surface acoustic wave temperature strain composite sensor is used to obtain the strain and temperature information of the gasket edge before and after the bolt is loosened, and the strain and temperature information of the gasket edge are used to characterize the change of the preload, so as to realize the monitoring of the bolt preload. The surface acoustic wave temperature strain composite sensor proposed in the present invention can eliminate the mutual interference of temperature and strain by differential compensation, and realize the simultaneous measurement of gasket temperature and strain within the temperature and strain range borne by the substrate material.

[0036] like Figure 2As shown, the sensor antenna 2 is electrically connected to the sensor chip 1. The sensor chip 1 is the main passive wireless sensor element, which can complete the mutual conversion between electrical signals and mechanical waves. The reader 5 sends the query signal 8 through the reader antenna 4. The query signal 8 is transmitted to the sensor chip 1 through the sensor antenna 2. The sensor chip 1 converts the electromagnetic wave signal of the query signal into a mechanical wave, namely, a surface acoustic wave, which propagates inside the sensor chip 1 and reads the bolt preload state information of the sensor chip 1. The surface acoustic wave is converted into an electromagnetic wave again by the passive sensor chip 1 and wirelessly transmitted through the sensor antenna 2 to generate an echo signal 9. The echo signal 9 is received by the reader antenna 7 and transmitted to the reader 5. The reader 5 analyzes the parameters of the echo signal 9 and obtains the bolt preload state information.

[0037] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A wireless passive bolt preload force detection device, characterized in that: It comprises a gasket-type surface acoustic wave temperature strain composite sensor, a reader (5) and a reader antenna (7), wherein the gasket-type surface acoustic wave temperature strain composite sensor comprises a surface acoustic wave gas sensor and a gasket (3); The gasket (3) is arranged between the bolt (4) and the connected part, the surface acoustic wave gas sensor is fixedly arranged in a stress concentration area on the gasket (3), and the reader (5) is connected to the surface acoustic wave gas sensor signal via a reader antenna (7).

2. The wireless passive bolt preload force detection device according to claim 1, characterized in that: The reader (5) is connected to a reader antenna (7) via an antenna feeder (6); The reader (5) is used to send a query signal (8) through a reader antenna (7), and send the query signal (8) to a surface acoustic wave gas sensor.

3. The wireless passive bolt preload force detection device according to claim 1, characterized in that: The surface acoustic wave gas sensor comprises a sensor chip (1), a sensor antenna (2) and a PCB pad; The sensor chip (1) and the sensor antenna (2) are both fixed on a PCB pad, and the sensor chip (1) and the sensor antenna (2) are electrically connected; The sensor chip (1) is used to receive a query signal (8) from a reader (5) and generate an echo signal (9) for reception by a reader antenna (7).

4. The wireless passive bolt preload force detection device according to claim 3 is characterized in that: The sensor chip (1) is fixed on the PCB pad by means of hard glue, and is bound to the PCB pad by means of gold wire.

5. The wireless passive bolt preload force detection device according to claim 3 is characterized in that: The sensor chip (1) comprises a surface acoustic wave resonator.

6. The wireless passive bolt preload force detection device according to claim 1, characterized in that: The surface acoustic wave gas sensor is fixed to the edge of the gasket (3) by means of an adhesive.

7. The wireless passive bolt preload force detection device according to claim 1, characterized in that: The outer edge of the gasket (3) is provided with a notch to form a monitoring point, and the surface acoustic wave gas sensor is installed in the monitoring point.

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