Deformation detection system for deformation surface of long-arm beam and detection method thereof

Abstract

The invention discloses a deformation detection system for a deformation surface of a long-arm beam and a detection method thereof. The detection system comprises an array type flexible induction sheet, a detection module, a multi-channel detector and a graphical unit, the array type flexible induction sheet serves as a sensing terminal and is arranged on the deformation surface of the long arm beam to be measured, and the deformation amount of the deformation surface of the long arm beam to be measured is reflected through the variable amount of the resistance value of the array type flexible induction sheet. The detection module is connected with the array type flexible induction sheet and is used for acquiring point voltage on the array type flexible induction sheet; the multi-channel detector is respectively connected with the array type flexible induction sheet and the detection module and is used for providing constant current for the array type flexible induction sheet and receiving point voltage data acquired by the detection module; and the graphical unit is connected with the multi-channel detector and is used for receiving and processing the point voltage data to obtain deformation data of the deformation surface of the long-arm beam to be detected and carrying out graphical display. The device has the advantages of simple structure, low cost, accurate measurement and the like.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of structural beam deformation detection, and in particular to a deformation detection system and a detection method for a deformation surface of a long arm beam. Background Art

[0002] At present, the detection technology of structural beam deformation state has been widely used, and many different types of detection technologies have been developed, including strain gauge deformation detection technology, optical deformation measurement technology, fiber Bragg grating deformation measurement technology, etc., but they all have certain limitations. For example, the strain gauge deformation detection technology has large errors and poor consistency; the optical deformation measurement technology has a blind spot in the field of view and a small measurement range; the fiber Bragg grating deformation measurement technology has complex processes and high costs, and can only measure linear deformation. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the present invention provides a deformation detection system and a detection method for the deformation surface of a long arm beam with high measurement accuracy.

[0004] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0005] A deformation detection system for a deformation surface of a long arm beam, comprising an array-type flexible sensing sheet, a detection module, a multi-channel detector and a graphical unit;

[0006] The array-type flexible sensing sheet is used as a sensing terminal and is arranged on the deformation surface of the long arm beam to be measured, and reflects the deformation of the deformation surface of the long arm beam to be measured through the change in its own resistance value;

[0007] The detection module is connected to the array-type flexible sensing sheet and is used to collect point voltages on the array-type flexible sensing sheet;

[0008] The multi-channel detector is connected to the array-type flexible sensing sheet and the detection module respectively, and is used to provide a constant current to the array-type flexible sensing sheet and receive point voltage data collected by the detection module;

[0009] The graphical unit is connected to the multi-channel detector and is used to receive point voltage data for processing, obtain deformation data of the deformation surface of the measured long arm beam and display it graphically.

[0010] Preferably, the array-type flexible sensing sheet comprises a substrate, a sensing sheet and an electrical connector;

[0011] The sensing piece is encapsulated inside the substrate; one side of the substrate is bonded to the long arm beam to be measured, and a wire hole is provided on the other side of the substrate. The sensing piece is connected to the detection module through a wire passing through the wire hole; each of the sensing pieces is connected to the multi-channel detector through an electrical connector.

[0012] Preferably, the sensing sheets are long strips of metal copper sheets, which are arranged in parallel with equal intervals on the deformation surface of the long arm beam to be measured.

[0013] Preferably, the substrate is a substrate made of nylon fabric.

[0014] Preferably, the array-type flexible sensing sheet is fixed on the deformation surface of the measured long arm beam by structural adhesive.

[0015] Preferably, the detection module is fixed on a bracket, and the bracket is fixed on the long arm beam to be measured.

[0016] Preferably, it further comprises a host computer, and the host computer is connected to the graphic unit.

[0017] The present invention also discloses a deformation detection method based on the deformation detection system of the deformation surface of the long arm beam as described above, comprising the steps of:

[0018] Apply structural adhesive for fixing at the position and edges of each sensor sheet of the array-type flexible sensor sheet, lay the array-type flexible sensor sheet flat on the surface of the beam to be measured, and press and solidify for a predetermined time;

[0019] The array-type flexible sensing sheet is connected to the detection module and the multi-channel detector respectively; a constant current is provided to the array-type flexible sensing sheet through the multi-channel detector;

[0020] The detection module collects the point voltage on the array-type flexible sensing sheet and sends it to the graphic unit via a multi-channel detector;

[0021] The graphical unit performs graphical processing and data analysis on the collected data, calculates the deformation data of the surface of the measured object and displays it.

[0022] Preferably, the graphics unit processes the collected data in graphics, generates a three-dimensional graphics of the surface deformation of the measured object in real time, and displays statistical data.

[0023] Preferably, the statistical data includes a maximum value, an average value and a minimum value of deformation.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] The sensing pieces of the present invention are arranged in an array, and can monitor the displacement of the entire surface of the measured beam in three-axis directions by micro-deformation, and fit it into a three-dimensional curved surface graph, so as to conveniently view the deformation trend and state of the beam; at the same time, the sensing pieces and the measured beam are bonded by structural glue point gluing, and the bonding process has simple materials, convenient operation, good process stability and consistency (other technical solutions all adopt surface bonding solutions, use special bonding materials, are complicated to operate, and the process stability and consistency are difficult to guarantee), which can long-term and effectively detect the deformation state of the measured beam surface, and is particularly suitable for deformation state detection of ultra-thin welded structure long-arm beams.

[0026] The present invention converts the deformation displacement into the potential difference before and after deformation of each induction sheet. Since the mV voltage can be stably and reliably measured, and the induction sheet adopts the printing copper coating technology, the performance index consistency is very good, the measurement accuracy is high, the measurement repeatability is good, the cost is low, the application range is wide, and it is very suitable for deformation detection of various beam structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a transverse cross-sectional view of a deformation detection system of the present invention in an embodiment.

[0028] Figure 2 It is a longitudinal cross-sectional view of a deformation detection system according to an embodiment of the present invention.

[0029] Figure 3 It is a bottom view of the structure of an array-type flexible sensing sheet in an embodiment of the present invention.

[0030] Figure 4 It is a side view of the structure of an array-type flexible sensor sheet in an embodiment of the present invention.

[0031] Figure 5 The following are display effect diagrams of the graphical unit of the present invention in an embodiment; (a) is a front view; (b) is a side view.

[0032] Legend: 1. Array-type flexible sensing sheet; 111. Base material; 112. Sensing sheet; 113. Electrical connector; 2. Detection module; 3. Multi-channel detector; 4. Graphical unit; 5. Measured beam; 6. Structural adhesive; 7. Bracket; 8. Wire; 9. Communication cable; 10. Host computer; 11. Fastening screws. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 2 As shown, the deformation detection system of the deformation surface of the long arm beam according to the embodiment of the present invention comprises an array-type flexible sensing sheet 1, a detection module 2, a multi-channel detector 3 and a graphic unit 4;

[0035] The array-type flexible sensing sheet 1 is used as a sensing terminal, and reflects the deformation of the surface of the measured beam 5 through the change of its own resistance value;

[0036] The detection module 2 is connected to the array-type flexible sensing sheet 1 and is used to collect point voltages on the array-type flexible sensing sheet 1;

[0037] The multi-channel detector 3 is used to provide a constant current to the array-type flexible sensing sheet 1, and to summarize and organize the data collected by the detection module 2 and upload it to the graphical unit 4;

[0038] The graphic unit 4 is used to perform graphic processing and data analysis on the collected data, calculate the deformation data of the surface of the measured object (such as the long arm beam) and display it.

[0039] like Figure 1 , Figure 3 and Figure 4 As shown, the array-type flexible sensing sheet 1 includes a substrate 111, a sensing sheet 112 and an electrical connector 113;

[0040] The material of the substrate 111 is an ultra-thin nylon fabric with good extensibility, and has good insulation, waterproofness, extensibility and environmental adaptability, and is suitable for the "sandwich" process packaging structure, and is mainly used to package the sensor sheet 112;

[0041] The sensing sheet 112 serves as a standard position reference point and is a long metal copper sheet of standard thickness and width. It is packaged in an equidistant parallel arrangement according to actual detection requirements and is connected to the detection module to form a closed-loop measurement circuit. Of course, the sensing sheet 112 can also be a whole piece of metal copper sheet, depending on the actual situation.

[0042] The electrical connector 113 is used to connect each induction sheet 112 to the multi-channel detector 3 , and to provide a constant current to each induction sheet 112 through the multi-channel detector 3 .

[0043] Specifically, the sensing sheet 112 is wrapped by a non-metallic substrate 111, and the side facing the beam 5 to be measured is a non-metallic material and does not leak the sensing sheet 112. Structural glue is applied to the substrate 111 at the position of the sensing sheet 112, and the glued surface is attached to the surface of the beam 5 to be measured by hand or with tools, and cured for 24 hours;

[0044] The front (non-glue-dispensing) part (multiple wire holes) of the sensing sheet 112 is exposed and connected to the input end of the detection module 2 (which can also be considered as the electrode welding point of the wire) by welding wires. Specifically, by detecting the voltage between the sensing sheets 112 at each wire hole position, the resistance between the two wire holes can be obtained, and then the deformation between the two wire hole positions can be obtained. The above overall structure is simple and easy to operate.

[0045] like Figure 1 and Figure 2 As shown, the detection module 2 has multi-channel voltage detection and serial communication functions, one end of which is connected to the sensing sheet 112. Due to the short channel scanning cycle, the change data of the voltage value on the sensing sheet 112 can be detected in real time; the other end of the detection module 2 is connected to the multi-channel detector 3 through the serial port to receive the voltage detection data upload command.

[0046] like Figure 1 and Figure 2 As shown, the input end of the multi-channel detector 3 is connected to the detection module 2 for receiving the voltage detection data uploaded by it. It has a multi-channel voltage (the voltage between different wire holes can be selected) scanning and acquisition function, and can complete the voltage measurement function of all positions (wire hole positions) of the sensor sheet 112 within a very short sampling period; the output end of the multi-channel detector 3 is connected to the array-type flexible sensor sheet 1, and can output a high-precision regulated current.

[0047] like Figure 5 As shown, the graphical unit 4 can convert the collected voltage data into displacement information through processing and analysis, and fit the deformation of the surface of the measured beam 5 into a three-dimensional graph, and form a data recording table. When the cursor moves to the curve, the distance from the cursor indication point to the reference edge line, the maximum displacement and the detection time can be displayed.

[0048] In addition, a historical data storage period may be set, and the historical data at the corresponding time point will be stored on the host computer 10 for later data analysis.

[0049] The sensing piece 112 of the present invention is arranged in an array, and can monitor the displacement of the entire surface of the measured beam 5 in three-axis directions by micro-deformation, and fit it into a three-dimensional curved surface graph, so as to conveniently view the deformation trend and state of the beam; at the same time, the sensing piece 112 and the measured beam 5 are bonded by structural glue point gluing, and the bonding process has simple materials, convenient operation, good process stability and consistency (other technical solutions all adopt surface bonding solutions, use special adhesive materials, are complicated to operate, and the process stability and consistency are difficult to guarantee), which can long-term and effectively detect the deformation state of the surface of the measured beam 5, and is particularly suitable for deformation state detection of ultra-thin welded structure long-arm beams.

[0050] The present invention converts the deformation displacement into the potential difference before and after the deformation of each sensing sheet 112. Since the mV voltage can be stably and reliably measured, and the sensing sheet 112 adopts the printing copper coating technology, the performance index consistency is very good, the measurement accuracy is high, the measurement repeatability is good, the cost is low, and the application range is wide, which is very suitable for deformation detection of various beam structures.

[0051] like Figures 1 to 4As shown, the embodiment of the present invention further provides a deformation detection method based on the deformation detection system of the deformation surface of the long arm beam as described above, and the specific steps are as follows:

[0052] S1. Wipe the surface of the array-type flexible sensor sheet 1 with alcohol, and apply structural adhesive 6 for fixing at the position and edges of each sensor sheet 112;

[0053] S2, laying the array-type flexible sensing sheet 1 flat on the surface of the beam 5 to be measured, and pressing and curing for 24 hours;

[0054] S3, connecting the electrical connector 113 on the array-type flexible sensing sheet 1 to the current output end of the multi-channel detector 3 through the wire 8;

[0055] S4, fix the detection module 2 on the bracket 7, and connect one end of the detection module 2 to the induction sheet 112 through a wire; the other end is connected in series with other detection modules 2 through a communication cable 9, and finally connected to the acquisition input port of the multi-channel detector 3;

[0056] S5, adjust the distance between the detection module 2 and the array flexible sensing sheet 1 to a suitable position, and then fix the bracket 7 on the measured beam 5 by fastening screws 11; connect the multi-channel detector 3 to the host computer 10, and turn on the graphical unit 4 to perform system initialization measurement operations;

[0057] S6, operate the graphical unit 4 to start the automatic detection mode. When the surface of the measured beam 5 is deformed, the distance between adjacent sensing sheets 112 will be stretched. Since the extension length of the sensing sheet 112 is inversely proportional to the resistance value and has a linear relationship, when a constant current is passed, the linear increase in the resistance value can lead to a linear decrease in the voltage value. By connecting with the detection module 2 to form a closed-loop measurement loop, the voltage value on the sensing sheet 112 can be accurately detected. The "parabola" type spatial coordinate position is constructed through the graphical unit 4, and the vertical deformation of each sensing sheet 112 of the measured beam 5 is further calculated;

[0058] The graphics unit 4 will generate a three-dimensional graph of the surface deformation in real time, and statistical data such as the maximum value, average value and minimum value of the deformation can be directly viewed in the data recording table next to it.

[0059] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "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 invention and simplifying the description, rather than indicating or implying that the device or element referred to 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 invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A deformation detection system for the deformation surface of a long arm beam, It is characterized in that It comprises an array-type flexible sensing sheet (1), a detection module (2), a multi-channel detector (3) and a graphic unit (4); The array-type flexible sensing sheet (1) is used as a sensing terminal and is arranged on the deformation surface of the long arm beam to be measured, and reflects the deformation amount of the deformation surface of the long arm beam to be measured through the change amount of its own resistance value; The detection module (2) is connected to the array-type flexible sensing sheet (1) and is used to collect point voltages on the array-type flexible sensing sheet (1); The multi-channel detector (3) is connected to the array-type flexible sensing sheet (1) and the detection module (2) respectively, and is used to provide a constant current to the array-type flexible sensing sheet (1) and receive point voltage data collected by the detection module (2); The graphic unit (4) is connected to the multi-channel detector (3) and is used to receive point voltage data for processing, obtain deformation data of the deformation surface of the long arm beam being measured and display the data graphically.

2. The deformation detection system for the deformation surface of the long arm beam according to claim 1, It is characterized in that The array-type flexible sensing sheet (1) comprises a substrate (111), a sensing sheet (112) and an electrical connector (113); The sensing sheet (112) is packaged inside the substrate (111); one side of the substrate (111) is bonded to the long arm beam to be measured, and a wire hole is provided on the other side of the substrate (111); the sensing sheet (112) is connected to the detection module (2) via a wire (8) passing through the wire hole; and each of the sensing sheets (112) is connected to the multi-channel detector (3) via an electrical connector (113).

3. The deformation detection system for the deformation surface of the long arm beam according to claim 2, It is characterized in that The sensing sheets (112) are long strips of metal copper sheets, which are arranged in parallel at equal intervals on the deformation surface of the long arm beam to be measured.

4. The deformation detection system for the deformation surface of the long arm beam according to claim 2 or 3, It is characterized in that The substrate (111) is a substrate (111) made of nylon fabric.

5. The deformation detection system for the deformation surface of the long arm beam according to claim 1, 2 or 3, It is characterized in that The array-type flexible sensing sheet (1) is fixed on the deformation surface of the long arm beam to be measured by means of structural adhesive (6).

6. The deformation detection system for the deformation surface of the long arm beam according to claim 1, 2 or 3, It is characterized in that The detection module (2) is fixed on a bracket (7), and the bracket (7) is fixed on the long arm beam to be measured.

7. The deformation detection system for the deformation surface of the long arm beam according to claim 1, 2 or 3, It is characterized in that It also includes a host computer (10), wherein the host computer (10) is connected to the graphic unit (4).

8. A deformation detection method based on the deformation detection system of the deformation surface of the long arm beam according to any one of claims 1 to 7, It is characterized in that Includes steps: Applying a fixing structural adhesive (6) to the positions of each sensing sheet (112) of the array-type flexible sensing sheet (1) and the surrounding edges, laying the array-type flexible sensing sheet (1) flat on the surface of the beam (5) to be measured, and pressing and curing for a predetermined time; The array-type flexible sensing sheet (1) is connected to the detection module (2) and the multi-channel detector (3) respectively; and a constant current is provided to the array-type flexible sensing sheet (1) via the multi-channel detector (3); The detection module (2) collects point voltages on the array-type flexible sensing sheet (1) and sends the voltages to the graphic unit (4) via a multi-channel detector (3); The graphics unit (4) performs graphics processing and data analysis on the collected data, calculates the deformation data of the surface of the measured object and displays it.

9. The deformation detection method according to claim 8, It is characterized in that The graphics unit (4) processes the collected data into graphics, generates a three-dimensional graphics of the surface deformation of the object under test in real time, and displays statistical data.

10. The deformation detection method according to claim 8 or 9, It is characterized in that The statistical data include the maximum, average and minimum values ​​of deformation.

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