CN215984978U - Small-size multi-functional expansion bolts stress detection device - Google Patents

Abstract

The utility model discloses a small-sized multifunctional expansion bolt stress detection device, which comprises a shell internally provided with a circuit board; the circuit board comprises a data analysis module for controlling the whole device, a data acquisition module, a data storage module, a power supply module, a wireless transmission module for connecting a server, a display and operation module for checking data and realizing touch control, an excitation module and a switching module, wherein the data acquisition module, the data storage module, the power supply module, the wireless transmission module, the display and operation module, the excitation module and the switching module are respectively connected with the excitation module, the data acquisition module and the ultrasonic probe; the data storage module is also electrically connected with the data acquisition module and used for storing data. According to the utility model, the stress borne by the expansion bolt is directly obtained by detecting the length change of the expansion bolt, the loosening degree and the falling risk of the expansion bolt can be rapidly evaluated, and the expansion bolt has the advantages of diversified functions, easiness in operation, quickness in detection, high accuracy and good stability.

Description

Small-size multi-functional expansion bolts stress detection device

Technical Field

The utility model relates to the technical field of stress detection, in particular to a small multifunctional expansion bolt stress detection device.

Background

The glass curtain wall is an outer protective structure of a building, is an important component of a modern high-rise building, has the functions of lighting, wind prevention, water prevention, heat preservation, heat insulation, noise reduction and the like, and is effectively combined with the function of attractive decoration. Along with the increase of glass curtain wall's use amount and live time, the expansion bolts performance degradation of its adoption, phenomenons such as not hard up and corruption can influence cohesive force and the fastening force of being used in on the curtain wall glass, cause curtain wall glass not hard up, can lead to the glass curtain wall plate to drop under the extreme condition. The looseness and the falling of the glass curtain wall plate can not only influence the normal use function, but also cause the greatest harm to casualties and property loss caused by falling from high altitude. In recent years, many glass curtain wall falling accidents occur in China, and extremely serious consequences are caused. However, the existing expansion bolt fastening detection methods and devices suitable for the glass curtain wall are very few, the stress borne by the expansion bolt cannot be directly measured, and the simple, efficient and reliable expansion bolt loosening and falling risk methods and devices are also very few, so that the fastening degree, loosening and falling risk of the expansion bolt are difficult to judge in the prior art.

The stress condition of the expansion bolt for connecting the glass curtain wall and the concrete structure is detected by an ultrasonic method, the fastening condition of the expansion bolt and the surrounding concrete structure is analyzed, and the method has the characteristics of high detection speed and high accuracy, and is an effective means for detecting the safety performance of the glass curtain wall. The method has the main principle that: based on the ultrasonic pulse reflection principle, the material stress is obtained by detecting the length change of the bolt. The ultrasonic detection technology has the characteristics of no harm to a human body, no damage to a measured object, quick measurement and the like, does not need to be a transparent object like a photoelastic method, can measure any construction or structure, directly measures the stress borne by the bolt, and is not influenced by the friction coefficient discreteness like a torque hand. Therefore, the working state of the expansion bolt is tested and analyzed through an ultrasonic detection method, so that the looseness degree and the falling risk of the curtain wall glass are evaluated, and the method is an ideal detection means. Therefore, there is a need for a small-sized multifunctional expansion bolt stress detection device for testing and analyzing the working state of the expansion bolt based on ultrasonic detection.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome part or all of the defects in the prior art and provide a small multifunctional expansion bolt stress detection device.

The technical scheme of the utility model is as follows:

a small multifunctional expansion bolt stress detection device comprises a shell and a circuit board arranged in the shell, wherein the circuit board comprises a data acquisition module, a data analysis module, a data storage module, a switching module, a power supply module, a wireless transmission module, a display and operation module and an excitation module; the data analysis module is respectively electrically connected with the data acquisition module, the data storage module, the power supply module, the wireless transmission module, the display and operation module and the excitation module, the data analysis module is used for realizing control over the whole device, the power supply module is used for supplying power, the display and operation module is used for checking data and realizing touch control, and the wireless transmission module is used for carrying out data communication with the server; the switching module is respectively electrically connected with the excitation module and the data acquisition module, the switching module is also electrically connected with an ultrasonic probe, the excitation module is used for exciting the ultrasonic probe to realize excitation of ultrasonic waves, the data acquisition module is used for acquiring analog voltage signals generated by the ultrasonic probe according to ultrasonic echoes to realize acquisition of the ultrasonic waves, the switching module is used for switching the ultrasonic probe to form a passage with the excitation module or form a passage with the data acquisition module, and the small multifunctional expansion bolt stress detection device realizes excitation and acquisition of the ultrasonic waves through the same passage through the switching module in practical application; the data acquisition module is also electrically connected with the data storage module, and the data storage module is used for storing the data transmitted by the data acquisition module.

Further, the small multifunctional expansion bolt stress detection device also comprises a high-pass filter; the high-pass filter is respectively electrically connected with the switching module and the data acquisition module and is used for filtering clutter so as to reduce noise interference.

Further, the ultrasound probe comprises an ultrasound transducer; the ultrasonic transducer is electrically connected with the switching module and is used for sending out ultrasonic waves and receiving the ultrasonic waves to generate corresponding analog voltage signals;

the frequency of the ultrasonic transducer is 5 MHz.

Further, the data analysis module comprises an MCU; the MCU is respectively electrically connected with the data acquisition module, the data storage module, the wireless transmission module, the power supply module, the excitation module and the display and operation module, and the whole device is controlled by the MCU during application;

the MCU consists of a microcontroller of the type STM32F429IGT6 and a logic controller of the type EP4CE10F17C 8N.

Further, the data acquisition module comprises an analog-to-digital converter U1; the analog-to-digital converter U1 is electrically connected with the MCU, the high-pass filter and the data storage module respectively, the analog-to-digital converter U1 is electrically connected with the switching module through the high-pass filter, and the analog-to-digital converter U1 is used for acquiring analog voltage signals generated by the ultrasonic transducer and transmitting the acquired data to the data storage module for storage;

the model of the analog-to-digital converter U1 is AD 6645.

Further, the excitation module comprises a DDS generation chip U2 and a high-speed amplification chip; the DDS generation chip U2 is electrically connected with the MCU and the high-speed amplification chip respectively, the high-speed amplification chip is also electrically connected with the switching module, and the DDS generation chip U2 and the high-speed amplification chip are used for exciting the ultrasonic transducer so that the ultrasonic transducer emits ultrasonic waves;

the DDS generation chip U2 is AD9850, and the high-speed amplification chip is ADA 4870.

Further, the wireless transmission module is a 4G module U3; the 4G module U3 is electrically connected with the MCU, the 4G module U3 is also in communication connection with the server, and when the 4G module U3 is applied, the MCU transmits data to the 4G module U3 and then the 4G module U3 remotely transmits the data to the server through a mobile network;

the model of the 4G module U3 is EC 20.

Further, the display and operation module comprises a touch screen; the touch screen is arranged on the shell and electrically connected with the MCU, and the touch screen is used for displaying information transmitted by the MCU and realizing touch control.

Further, the data storage module includes a card socket connector J1; the card holder connector J1 is electrically connected with the MCU and the analog-to-digital converter U1 respectively, a TF card is placed in the card holder connector J1, and the card holder connector J1 and the TF card are used for realizing data storage;

the model of the card socket connector J1 is TF-015.

Furthermore, still be provided with first data acquisition mouth, second data acquisition mouth, function button, switch, confirm button, cancel button, USB interface, Micro-USB interface and be used for supplying the TF draw-in groove that the TF card inserted and pulled out on the casing respectively, MCU respectively with function button, switch, confirm button, cancel button electric connection, function button, switch, confirm button, cancel button all are used for the instruction to trigger.

By adopting the scheme, the utility model has the following beneficial effects:

1. the expansion bolt length change data can be provided for judging the loosening degree and the falling risk of the expansion bolt, the stress borne by the expansion bolt can be directly obtained by detecting the length change of the expansion bolt, the restriction is small, any curtain wall structure can be detected, the functions of data display, touch operation, data storage and data wireless transmission are realized, the on-site detection is convenient, the detection data are sent to a server through a wireless transmission module, the data can be deeply analyzed conveniently, the design is exquisite, the structure is simple and exquisite, the functions are diversified, the operation and the carrying are easy, the detection is fast, the accuracy is high, and the stability is good;

2. due to the application of the high-pass filter in the optimal scheme, the noise interference is effectively reduced, the detection accuracy is improved, and the detection effect is better.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a functional block diagram of the internal circuitry of the present invention;

FIG. 3 is a circuit diagram of a wireless transmission module according to the present invention;

FIG. 4 is a partial circuit diagram of the excitation module of the present invention;

FIG. 5 is a circuit diagram of a data acquisition module of the present invention;

FIG. 6 is a circuit diagram of a data storage module according to the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Referring to fig. 1 to 6, the utility model provides a small multifunctional expansion bolt stress detection device for detecting an expansion bolt connecting a curtain wall and a concrete structure, which comprises a shell 1 and a circuit board arranged in the shell 1; the circuit board comprises a data acquisition module 101, a data analysis module 102, a data storage module 103, a switching module 104, a power supply module 105, a wireless transmission module 106, a display and operation module 107 and an excitation module 108; the data analysis module 102 is respectively electrically connected with the data acquisition module 101, the data storage module 103, the power supply module 105, the wireless transmission module 106, the display and operation module 107 and the excitation module 108, the data analysis module 102 is used for controlling the whole device, the control includes outputting and collecting analog voltage, analyzing and processing data, the power module 105 is used for supplying power to provide electric energy required by the whole device to work, the display and operation module 107 is used for displaying the information transmitted by the data analysis module 102 and for realizing touch control, namely, the display and operation module 107 is used for viewing data and for implementing touch control, the wireless transmission module 106 is used for communicatively connecting the server to implement remote communication between the data analysis module 102 and the server, namely, the wireless transmission module 106 is used for data communication with the server; the switching module 104 is further electrically connected to the excitation module 108 and the data acquisition module 101, respectively, the switching module 104 is further electrically connected to an ultrasound probe, the excitation module 108 is configured to excite the ultrasound probe so that the ultrasound probe emits an ultrasonic wave to realize excitation of the ultrasonic wave, the data acquisition module 101 is configured to acquire an analog voltage signal generated by the ultrasound probe according to the ultrasonic wave (i.e., an ultrasonic echo) received by the ultrasound probe itself so as to acquire data of the ultrasound probe, that is, the excitation module 108 and the data acquisition module 101 share one channel, when the ultrasound probe is used as a transmitter, the excitation module 108 outputs a first analog voltage signal, and the first analog voltage signal is input to the ultrasound probe through the switching module 104, the ultrasonic probe sends out ultrasonic waves according to an input first analog voltage signal so as to realize excitation of the ultrasonic waves, when the ultrasonic probe is used as a receiver, the ultrasonic probe receives the ultrasonic waves and generates a corresponding second analog voltage signal according to the ultrasonic waves received by the ultrasonic probe, the second analog voltage signal is input into the data acquisition module 101 through the switching module 104 so as to realize real-time acquisition of the analog voltage signal generated by the ultrasonic probe through the data acquisition module 101 and further realize acquisition of the ultrasonic waves, the switching module 104 is used for switching the ultrasonic probe to a passage formed by the excitation module 108 or a passage formed by the ultrasonic probe and the data acquisition module 101, namely the switching module 104 is used for realizing operation switching of the excitation module 108 and the data acquisition module 101, namely, the switching module 104 is used for realizing the same operation switching of the small multifunctional expansion bolt stress detection device in practical application One channel is used for exciting and collecting ultrasonic waves; the data acquisition module 101 is further electrically connected to the data storage module 103, and the data storage module 103 is configured to store data transmitted by the data acquisition module 101. Further, the air conditioner is provided with a fan,

in order to reduce noise interference, the small-sized multifunctional expansion bolt stress detection device uses a high-pass filter 109 in this example, that is, the small-sized multifunctional expansion bolt stress detection device further includes a high-pass filter 109; high pass filter 109 respectively with switch module 104 and data acquisition module 101 electric connection, promptly data acquisition module 101 with switch module 104 passes through high pass filter 109 realizes electric connection, high pass filter 109 is used for filtering the clutter, that is to say, this small-size multi-functional expansion bolts stress detection device passes through when practical application high pass filter 109 filters the transmission and gives the clutter of the analog voltage signal of data acquisition module 101 is in order to realize reducing noise interference, has improved the detection precision, and detection effect is better.

The ultrasonic probe comprises an ultrasonic transducer 110, the ultrasonic transducer 110 is electrically connected with the switching module 104, and the ultrasonic transducer 110 is used for emitting ultrasonic waves and receiving the ultrasonic waves to generate corresponding analog voltage signals; in practical application, the ultrasonic probe and the expansion bolt to be detected are fixed together, wherein a coupling agent is coated on a contact surface of the ultrasonic probe and the expansion bolt in advance, so that the ultrasonic probe is in close contact with an object to be detected (namely, the expansion bolt to be detected), then the switching module 104 switches the ultrasonic transducer 110 to form a passage with the excitation module 108 so that the excitation module 108 excites the ultrasonic transducer 110 to emit ultrasonic waves, then the switching module 104 switches the ultrasonic transducer 110 to form a passage with the data acquisition module 101 and the high-pass filter 109 so that the data acquisition module 101 acquires analog voltage signals generated by the ultrasonic transducer 110 receiving the ultrasonic waves, the analog voltage signals generated by the ultrasonic transducer 110 receiving the ultrasonic waves are filtered by the high-pass filter 109 and then read and acquired by the data acquisition module 101, specifically, the frequency of the ultrasonic transducer 110 is 5 MHz.

The data analysis module 102 comprises an MCU, and the MCU is respectively electrically connected with the data acquisition module 101, the data storage module 103, the wireless transmission module 106, the power supply module 105, the excitation module 108 and the display and operation module 107; specifically, the MCU is a development board with a microcontroller of model STM32F429IGT6 and a logic controller of model EP4CE10F17C8N as core chips, that is, the MCU is composed of a microcontroller of model STM32F429IGT6 and a logic controller of model EP4CE10F17C8N, and has the advantages of small size, high integration level, flexible interface, and convenient secondary development, and the MCU is used to control the whole device.

The data acquisition module 101 includes an analog-to-digital converter U1 with a model number of AD6645, the analog-to-digital converter U1 is electrically connected to the MCU, the high-pass filter 109 and the data storage module 103, that is, the analog-to-digital converter U1 is electrically connected to the switching module 104 through the high-pass filter 109, that is, the analog-to-digital converter U1 is electrically connected to the switching module 104 through the high-pass filter 109, and the analog-to-digital converter U1 is configured to acquire an analog voltage signal generated by the ultrasonic transducer 110 and transmit the acquired data to the data storage module 103 for storage; that is to say, the analog voltage signal generated by the ultrasonic transducer 110 receiving the ultrasonic wave is input to the high-pass filter 109 through the switching module 104, the data filtered by the high-pass filter 109 is collected in real time through the analog-to-digital converter U1, and the data collected by the analog-to-digital converter U1 is transmitted to the data storage module 103 for storage.

The excitation module 108 comprises a DDS generation chip U2 with a model number of AD9850 and a high-speed amplification chip with a model number of ADA4870, the DDS generation chip U2 is electrically connected to the MCU and the high-speed amplification chip respectively, the high-speed amplification chip is also electrically connected to the switching module 104, and the DDS generation chip U2 and the high-speed amplification chip are used for cooperating to excite the ultrasonic transducer 110 so that the ultrasonic transducer 110 emits ultrasonic waves; that is, under the control of the MCU, the DDS generating chip U2 generates an excitation signal, the excitation signal is amplified by the high-speed amplifier chip to form an analog voltage signal, the analog voltage signal is input to the ultrasonic transducer 110 through the switching module 104, and the ultrasonic transducer 110 excites the ultrasonic wave according to the analog voltage signal, thereby completing the excitation of the ultrasonic wave.

In this embodiment, the wireless transmission module 106 is a 4G communication module, the 4G communication module preferably adopts a 4G module U3 with the model number EC20, the 4G module U3 is electrically connected to the MCU, and the 4G module U3 is further in communication connection with the server, that is, the MCU and the server are in communication connection through the 4G module U3, and when in application, the MCU transmits data to the 4G module U3, and then the 4G module U3 remotely transmits data to the server through a mobile network.

The display and operation module 107 comprises a touch screen 2, the touch screen 2 is arranged on the shell 1, the touch screen 2 is electrically connected with the MCU, the touch screen 2 is used for displaying information transmitted by the MCU and is used for realizing touch control, namely, the touch screen 2 is used for realizing operations of checking data, amplifying curves, logging in a remote system and the like during actual application, so that the MCU performs instruction sending and information acquisition.

The data storage module 103 comprises a card socket connector J1 with the model of TF-015, the card socket connector J1 is electrically connected with the MCU and the analog-to-digital converter U1 respectively, a TF card is placed in the card socket connector J1, and the card socket connector J1 and the TF card are used for realizing data storage.

The switching module 104 includes a first data acquisition port 3 and a second data acquisition port 4, the first data acquisition port 3 and the second data acquisition port 4 in the top of the touch screen 2 is respectively arranged on the shell 1, the first data acquisition port 3 is electrically connected with the high-speed amplification chip, the second data acquisition port 4 is electrically connected with the high-pass filter 109, and during application, the ultrasonic probe is switched to be connected with the first data acquisition port 3 or the second data acquisition port 4 to realize the excitation and acquisition of ultrasonic waves through the same channel.

The shell 1 is further provided with a function button 5, a power switch 6, a determination button 7, a cancel button 8, a USB interface 9, a Micro-USB interface 10 and a TF card slot 11 for inserting and pulling a TF card, the MCU is further electrically connected with the function button 5, the power switch 6, the determination button 7, the cancel button 8 and the USB interface 9, and the function button 5, the power switch 6, the determination button 7 and the cancel button 8 are all used for instruction triggering; when the TF card is installed, the TF card is inserted into the card holder connector J1 through the TF card slot 11, and then the installation of the TF card can be achieved.

The power module 105 is powered by a battery and is charged through the Micro-USB interface 10, and the power module 105 is implemented by the prior art and is not described in detail.

The working process and principle of the utility model are as follows: firstly, fixing an ultrasonic probe and an expansion bolt to be detected together, wherein a coupling agent is required to be coated on a contact surface of the ultrasonic probe and the expansion bolt to be detected, so that the ultrasonic probe is tightly contacted with the expansion bolt to be detected, and detection preparation is made; then, exciting the ultrasonic transducer 110 to emit ultrasonic waves through the excitation module 108 to detect the expansion bolt to be detected so as to detect the length change of the expansion bolt; then, the ultrasonic transducer 110 receives the ultrasonic echo and generates a corresponding analog voltage signal according to the received ultrasonic echo, and the analog voltage signal is filtered by the high-pass filter 109 and then input to the data acquisition module 101; then, the data acquisition module 101 transmits the acquired data to the data storage module 103 for storage, the data analysis module 102 reads the data in the data storage module 103 to an internal cache of the MCU through the SDIO + DMA transmission mode, and analyzes and processes the data in the internal cache through a logic controller in the MCU, because the ultrasonic transducer 110 receives the ultrasonic echo and generates a corresponding analog voltage signal according to the received ultrasonic echo to reflect the length change of the expansion bolt, the data analyzed and processed by the data analysis module 102 can reflect the stress change of the expansion bolt, so as to reflect whether the expansion bolt is stable or not according to the calculated stress change, and further, the loosening degree and falling risk of the expansion bolt for connecting the glass curtain wall and the concrete structure can be rapidly evaluated.

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

1. the expansion bolt length change data can be provided for judging the loosening degree and the falling risk of the expansion bolt, the stress borne by the expansion bolt can be directly obtained by detecting the length change of the expansion bolt, the loosening degree and the falling risk of the expansion bolt can be quickly evaluated, the restriction is small, any curtain wall structure can be detected, the expansion bolt length change data detection system has the functions of data display, touch control operation, data storage and data wireless transmission, the field detection is convenient, the detection data are sent to a server through a wireless transmission module, the deep analysis of the data is convenient, the design is exquisite, the structure is simple and exquisite, the functions are diversified, the operation and the carrying are easy, the detection is quick, the accuracy is high, and the stability is good;

2. due to the application of the high-pass filter in the optimal scheme, the noise interference is effectively reduced, the detection accuracy is improved, and the detection effect is better.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A small-sized multifunctional expansion bolt stress detection device comprises a shell and a circuit board arranged in the shell, and is characterized in that the circuit board comprises a data acquisition module, a data analysis module, a data storage module, a switching module, a power supply module, a wireless transmission module, a display and operation module and an excitation module; the data analysis module is respectively electrically connected with the data acquisition module, the data storage module, the power supply module, the wireless transmission module, the display and operation module and the excitation module, the data analysis module is used for realizing control over the whole device, the power supply module is used for supplying power, the display and operation module is used for checking data and realizing touch control, and the wireless transmission module is used for carrying out data communication with the server; the switching module is respectively electrically connected with the excitation module and the data acquisition module, the switching module is also electrically connected with an ultrasonic probe, the excitation module is used for exciting the ultrasonic probe to realize excitation of ultrasonic waves, the data acquisition module is used for acquiring analog voltage signals generated by the ultrasonic probe according to ultrasonic echoes to realize acquisition of the ultrasonic waves, the switching module is used for switching the ultrasonic probe to form a passage with the excitation module or form a passage with the data acquisition module, and the small multifunctional expansion bolt stress detection device realizes excitation and acquisition of the ultrasonic waves through the same passage through the switching module in practical application; the data acquisition module is also electrically connected with the data storage module, and the data storage module is used for storing the data transmitted by the data acquisition module.

2. The small-sized multifunctional expansion bolt stress detecting device according to claim 1, characterized in that it further comprises a high-pass filter; the high-pass filter is respectively electrically connected with the switching module and the data acquisition module and is used for filtering clutter so as to reduce noise interference.

3. The small multifunctional expansion bolt stress detecting device according to claim 2, wherein the ultrasonic probe comprises an ultrasonic transducer; the ultrasonic transducer is electrically connected with the switching module and is used for sending out ultrasonic waves and receiving the ultrasonic waves to generate corresponding analog voltage signals;

the frequency of the ultrasonic transducer is 5 MHz.

4. The small multifunctional expansion bolt stress detection device according to claim 3, wherein the data analysis module comprises an MCU; the MCU is respectively electrically connected with the data acquisition module, the data storage module, the wireless transmission module, the power supply module, the excitation module and the display and operation module, and the whole device is controlled by the MCU during application;

the MCU consists of a microcontroller of the type STM32F429IGT6 and a logic controller of the type EP4CE10F17C 8N.

5. The small multifunctional expansion bolt stress detection device according to claim 4, wherein the data acquisition module comprises an analog-to-digital converter U1; the analog-to-digital converter U1 is electrically connected with the MCU, the high-pass filter and the data storage module respectively, the analog-to-digital converter U1 is electrically connected with the switching module through the high-pass filter, and the analog-to-digital converter U1 is used for acquiring analog voltage signals generated by the ultrasonic transducer and transmitting the acquired data to the data storage module for storage;

the model of the analog-to-digital converter U1 is AD 6645.

6. The small multifunctional expansion bolt stress detection device according to claim 4, wherein the excitation module comprises a DDS generation chip U2 and a high-speed amplification chip; the DDS generation chip U2 is electrically connected with the MCU and the high-speed amplification chip respectively, the high-speed amplification chip is also electrically connected with the switching module, and the DDS generation chip U2 and the high-speed amplification chip are used for exciting the ultrasonic transducer so that the ultrasonic transducer emits ultrasonic waves;

the DDS generation chip U2 is AD9850, and the high-speed amplification chip is ADA 4870.

7. The small multifunctional expansion bolt stress detection device according to claim 4, wherein the wireless transmission module is a 4G module U3; the 4G module U3 is electrically connected with the MCU, the 4G module U3 is also in communication connection with the server, and when the 4G module U3 is applied, the MCU transmits data to the 4G module U3 and then the 4G module U3 remotely transmits the data to the server through a mobile network;

the model of the 4G module U3 is EC 20.

8. The small multifunctional expansion bolt stress detection device according to claim 4, wherein the display and operation module comprises a touch screen; the touch screen is arranged on the shell and electrically connected with the MCU, and the touch screen is used for displaying information transmitted by the MCU and realizing touch control.

9. The small multifunctional expansion bolt stress detection device according to claim 5, wherein said data storage module comprises a socket connector J1; the card holder connector J1 is electrically connected with the MCU and the analog-to-digital converter U1 respectively, a TF card is placed in the card holder connector J1, and the card holder connector J1 and the TF card are used for realizing data storage;

the model of the card socket connector J1 is TF-015.

10. The small-sized multifunctional expansion bolt stress detection device according to claim 4, wherein the shell is further provided with a first data acquisition port, a second data acquisition port, a function button, a power switch, a confirm button, a cancel button, a USB interface, a Micro-USB interface, and a TF card slot for inserting and pulling a TF card, the MCU is electrically connected with the function button, the power switch, the confirm button and the cancel button, and the function button, the power switch, the confirm button and the cancel button are all used for triggering commands.

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