Dynamic resistance strain signal acquisition device

Abstract

The utility model discloses a dynamic resistance strain signal acquisition device, which comprises a detection seat, two ends of the detection seat are respectively provided with an installation part, a detection arm is arranged between the two installation parts, a detection hole is arranged in the middle of the detection arm, and four resistance strain gauges are uniformly arranged in the detection hole; a storage groove is formed in the side face of the installation part on one side, and a signal conditioning control panel is installed in the storage groove and electrically connected with the resistance strain gauges. According to the utility model, the full-bridge resistance strain gauge and the signal conditioning control board are integrated together, so that collected strain signals can be directly amplified, then converted into digital signals and directly output in a 485 form, the data collection process is further simplified, and connection and data interaction with other equipment are facilitated; the efficiency and flexibility of data acquisition are improved, and the method is more suitable for actual application scenes such as bridge monitoring.

Description

Technical Field

[0001] This utility model relates to the field of resistance strain monitoring technology, and in particular to a dynamic resistance strain signal acquisition device. Background Technology

[0002] Currently, most dynamic resistance strain gauges used in bridge monitoring on the market output analog signals (such as voltage and current). Typically, the strain of a bridge structure is extremely small. When data is acquired, the amplitude of analog signals is often low and susceptible to interference due to the inherent characteristics of analog signals, making them difficult for the acquisition equipment to effectively identify and process. Therefore, a dedicated signal conditioning amplifier is necessary to amplify and filter the analog signals. However, this requires the additional purchase of signal conditioning and amplifier equipment, increasing project costs. Furthermore, the signal conditioning amplifier needs to be re-calibrated and reinstalled, further increasing the technical difficulty of the construction process. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a dynamic resistance strain signal acquisition device that integrates strain signal acquisition and conditioning amplification functions, and outputs monitoring data digitally, thereby reducing project costs.

[0004] Therefore, the technical solution of this utility model is: a dynamic resistance strain signal acquisition device, including a detection base, with mounting parts at both ends of the detection base, and a detection arm in the middle of the two mounting parts, with a detection hole in the middle of the detection arm, and four resistance strain gauges evenly installed in the detection hole; a placement groove is provided on the side of one of the mounting parts, and a signal conditioning control board is installed in the placement groove, and the signal conditioning control board is electrically connected to the resistance strain gauges.

[0005] Based on the above scheme and as a preferred embodiment of the above scheme: the outer side of the detection arm is provided with a sealing layer, and a metal cover is provided above the storage slot. The metal cover is sealed and fixed to the opening of the storage slot with glue.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the signal conditioning control board is provided with a signal amplification circuit and an analog-to-digital conversion circuit, and the signal output terminal of the signal conditioning control board is connected to the RS485 bus.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the detection hole in the middle of the detection arm is a circular structure, and a first resistance strain gauge, a second resistance strain gauge, a third resistance strain gauge, and a fourth resistance strain gauge are respectively installed on the upper, lower, left, and right sides of the detection hole; the first resistance strain gauge, the second resistance strain gauge, the third resistance strain gauge, and the fourth resistance strain gauge constitute a Wheatstone bridge.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the left and right detection ends of the detection arm are respectively connected to two mounting parts, and the upper and lower sides of the left and right detection ends are provided with semi-circular notches.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the storage slot is provided with through holes on both sides, and one side of the through hole connects the storage slot and the detection arm.

[0010] Based on the above solution and as a preferred solution: the mounting part has a through mounting hole in the middle, and the top surface of the mounting part also has an adhesive part.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] By integrating the full-bridge resistance strain gauge and the signal conditioning control board, the acquired strain signal can be directly amplified and converted into a digital signal, which can then be output directly via RS-485. This eliminates the need for additional equipment to process and transmit the signal, further simplifying the data acquisition process, facilitating connection and data interaction with other devices, improving the efficiency and flexibility of data acquisition, and making it more suitable for practical application scenarios such as bridge monitoring.

[0013] By using the first, second, third, and fourth resistance strain gauges to construct a Wheatstone bridge, it is possible to more accurately detect extremely small strains in the bridge structure, providing a reliable data foundation for bridge monitoring and improving the accuracy of monitoring results.

[0014] By sealing the outer side of the detection arm and the storage slot with adhesive, the internal components such as the resistance strain gauge and signal conditioning control board can be effectively protected from the influence of external environmental factors, thus extending the service life of the device.

[0015] The mounting section is equipped with mounting holes and adhesive parts, allowing for bolt or adhesive fixing depending on the installation location, thus enhancing the convenience and stability of the device installation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the detection seat of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the detection seat of this utility model (from another angle).

[0020] The components in the diagram are labeled as follows: Detection base 1, first mounting part 11, second mounting part 12, assembly hole 13, adhesive part 14, storage slot 15, first wire hole 16, second wire hole 17, detection arm 2, left detection end 21, right detection end 22, semi-circular notch 23, detection hole 24, sealing layer 25, first resistance strain gauge 31, second resistance strain gauge 32, third resistance strain gauge 33, fourth resistance strain gauge 34, signal conditioning control board 4, and metal cover plate 5. Detailed Implementation

[0021] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0023] See the attached figures. The dynamic resistance strain signal acquisition device described in this embodiment includes a detection base 1, which is made of aluminum alloy. The detection base 1 has a first mounting part 11 and a second mounting part 12 at both ends, respectively. A through mounting hole 13 is provided between the first mounting part 11 and the second mounting part 12, and an adhesive part 14 is also provided on the top surface. When detecting bridge strain, the dynamic resistance strain gauge is usually installed on the reinforcing steel or concrete. Therefore, depending on the installation location, it can be fixed by bolts or adhesive, improving the user's installation convenience.

[0024] A detection arm 2 is located between the first mounting part 11 and the second mounting part 12. The left detection end 21 and the right detection end 22 of the detection arm 2 are connected to the first mounting part 11 and the second mounting part 12, respectively. Semi-circular notches 23 are provided on the upper and lower sides of the left detection end 21 and the right detection end 22. The left detection end 21 and the right detection end 22 are joined together to form a circular detection hole 24. A first resistance strain gauge 31, a second resistance strain gauge 32, a third resistance strain gauge 33, and a fourth resistance strain gauge 34 are installed on the upper, lower, left, and right sides of the detection hole 24, respectively. The first resistance strain gauge 31, the second resistance strain gauge 32, the third resistance strain gauge 33, and the fourth resistance strain gauge 34 form a Wheatstone bridge. The first resistance strain gauge 31, the second resistance strain gauge 32, the third resistance strain gauge 33, and the fourth resistance strain gauge 34 are made of constantan, and their connection relationship is a mature existing technology, which will not be described in detail here. Subsequently, a sealing layer 25 is provided on the outside of the detection arm 2 to wrap the detection arm.

[0025] A storage slot 15 extends from the first mounting part 11, and a signal conditioning control board 4 is installed inside the storage slot 15. The signal conditioning control board 4 is electrically connected to the resistance strain gauge. A first wire-passing hole 16 and a second wire-passing hole 17 are provided on both sides of the storage slot 15. The first wire-passing hole 16 connects the storage slot 15 and the detection arm 2, facilitating wire passage, while the second wire-passing hole 17 is used for passing an RS485 bus. A metal cover plate 5 is provided above the storage slot 15, and the metal cover plate 5 is sealed and fixed to the opening of the storage slot 15 with adhesive.

[0026] The signal conditioning control board 4 is equipped with a signal amplification circuit and an analog-to-digital conversion circuit. The signal output terminal of the signal conditioning control board is connected to an RS485 bus. The signal conditioning control board (including the processing chip STM32F767IGT6) has a signal amplification circuit that can amplify the signal detected by the resistance strain gauge (amplification by 100 times). Then, the analog signal is converted into a digital signal through the analog-to-digital conversion circuit. The analog-to-digital conversion circuit can be a commonly used analog-to-digital conversion chip (AD7766B). Finally, the digital signal is transmitted from the RS485 bus to the monitoring platform, which greatly reduces project costs and alleviates the computing pressure on the platform.

[0027] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A dynamic resistance strain signal acquisition device, characterized in that: The device includes a detection base, with mounting parts at both ends and a detection arm between the two mounting parts. A detection hole is provided in the middle of the detection arm, and four resistance strain gauges are evenly installed in the detection hole. A storage slot is provided on one side of the mounting part, and a signal conditioning control board is installed in the storage slot. The signal conditioning control board is electrically connected to the resistance strain gauges.

2. The dynamic resistance strain signal acquisition device as described in claim 1, characterized in that: The outer side of the detection arm is covered with a sealing layer, and a metal cover is provided above the storage slot. The metal cover is sealed and fixed to the opening of the storage slot with glue.

3. The dynamic resistance strain signal acquisition device as described in claim 1, characterized in that: The signal conditioning control board is equipped with a signal amplification circuit and an analog-to-digital conversion circuit, and the signal output terminal of the signal conditioning control board is connected to an RS485 bus.

4. The dynamic resistance strain signal acquisition device as described in claim 1, characterized in that: The detection hole in the middle of the detection arm is circular, and a first resistance strain gauge, a second resistance strain gauge, a third resistance strain gauge, and a fourth resistance strain gauge are respectively installed on the top, bottom, left, and right sides of the detection hole; the first resistance strain gauge, the second resistance strain gauge, the third resistance strain gauge, and the fourth resistance strain gauge constitute a Wheatstone bridge.

5. The dynamic resistance strain signal acquisition device as described in claim 4, characterized in that: The left and right detection ends of the detection arm are connected to two mounting parts respectively, and semi-circular notches are provided on the upper and lower sides of the left and right detection ends.

6. The dynamic resistance strain signal acquisition device as described in claim 1, characterized in that: The storage slot has through holes on both sides, with one side of the through hole connecting the storage slot and the detection arm.

7. The dynamic resistance strain signal acquisition device as described in claim 1, characterized in that: The mounting part has a through mounting hole in the middle, and an adhesive part is also provided on the top surface of the mounting part.

Images