Self-sensing nondestructive testing device for prestress of metamaterial electronic skin anchor cable

Abstract

The invention discloses a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device which comprises an applying main body, a load main body is arranged below the applying main body, and the applying main body comprises a near-infrared lamp panel, a metal tube, a pressure-bearing hammer, a telescopic spring, an anchor cable hole and a first rack. The device has the beneficial effects that by arranging the applying main body, the load main body, the operation panel, the power supply storage box, the display screen, the heat preservation and insulation layer and the near-infrared lamp panel, when the metamaterial electronic skin is stressed to deform, an electronic skin sensor is used for collecting a deformation value and transmitting the deformation value to a data collecting and processing module; the borne pressure, namely the pretension stress borne by the anchor cable, is obtained according to the deformation characteristic of the material, the numerical value of the pretension is fed back to the display screen in real time, after detection is completed, the metal wire switch is turned on, the metamaterial electronic skin is heated to restore the original shape, the metal wire switch is turned off, and detection is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of prestress detection of prestressed anchor cables, and in particular to a metamaterial electronic skin anchor cable prestress self-sensing nondestructive detection device. Background Art

[0002] Prestressed anchor cables are a commonly used form of support for foundation pits. The key technology is the effective prestress applied to the anchor cables. Therefore, efficient and fast detection of anchor cable prestress becomes very important. By real-time monitoring of anchor cable stress changes, abnormal conditions such as excessive or insufficient stress can be discovered in time, so that corresponding measures can be taken to ensure the stability and safety of the structure and avoid accidents.

[0003] The prior art has the following deficiencies: the prior art "A device and method for detecting prestressed anchor cables for mining" with publication number CN115452225A "includes a mounting base, an electric lifting assembly is arranged above the mounting base, the electric lifting assembly includes a lifting cylinder fixedly connected to the mounting base, a retractable moving mechanism is arranged at the upper end of the mounting base, and a chassis reinforcement mechanism is arranged inside the mounting base for preventing the device from tipping over."

[0004] The above structure can better solve the technical problem that the prestressed inspection equipment is greatly affected by the environment, which often leads to large deviations in the inspection results. However, the support components of this structure have a certain height. Although it can solve the technical deviation problem affected by the environment, some structural parts with low height and narrow space cannot be used, so it is not efficient and convenient. Therefore, a metamaterial electronic skin anchor prestressed self-sensing non-destructive inspection device is urgently needed to solve the existing problem. Summary of the invention

[0005] The purpose of the present invention is to provide a metamaterial electronic skin anchor cable prestress self-sensing non-destructive testing device in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A metamaterial electronic skin anchor cable prestressed self-sensing nondestructive testing device comprises an application body, a load body is arranged below the application body, the application body comprises a near-infrared light board, a metal tube, a pressure hammer, a telescopic spring, an anchor cable hole and a first frame, the load body comprises a metamaterial electronic skin, an electronic skin sensor, an electric heating wire and a second frame, and the light source of the near-infrared light board faces the metamaterial electronic skin, the first frame and the second frame are offset, and the metamaterial electronic skin, the electronic skin sensor and the electric heating wire are vertically distributed in the second frame.

[0008] Furthermore, there are four groups of metal tubes, which are fixed in the first frame, and two groups of pressure hammers are vertically arranged in each group of metal tubes, the two groups of pressure hammers are connected by the telescopic springs, and the anchor cable holes are formed on the pressure hammers.

[0009] By adopting the above technical solution, the compression hammer can move downward when under pressure through the telescopic spring, and can freely return to its original position when no force is applied.

[0010] Furthermore, the metamaterial electronic skin is a shape memory polyurethane material with photothermal effect and fluorescent properties customized by an engineered metal-phenolic system, and the diameter of the metamaterial electronic skin is slightly smaller than that of the pressure hammer.

[0011] By adopting the above technical solution, it is convenient for the pressure hammer to act on the metamaterial electronic skin.

[0012] Furthermore, a bracket is fixed in the second frame, and the electronic skin sensor is fixed on the bracket, and the electronic skin sensor corresponds to the position of the metamaterial electronic skin.

[0013] By adopting the above technical solution, it is convenient to support the electronic skin sensor through the bracket, and collect the deformation value of the metamaterial electronic skin through the electronic skin sensor and transmit it to the data acquisition and processing module.

[0014] Furthermore, an infrared light switch and a metal wire switch are installed on one side outside the load body.

[0015] By adopting the above technical solution, it is convenient to control the near-infrared light panel and the electric heating wire to work through the infrared light switch and the metal wire switch.

[0016] Furthermore, an operation panel is fixed on the outside of the load body adjacent to the metal wire switch, a display screen is installed on the operation panel, a data acquisition and processing module is fixed inside the operation panel, and a power box is installed on the outside of the load body adjacent to the operation panel.

[0017] By adopting the above technical solution, it is convenient for staff to use the operation panel control device to work, the display screen can display the detection value, and the data acquisition and processing module can receive and process the detection data of the electronic skin sensor.

[0018] Furthermore, a thermal insulation layer is installed inside the walls of the first frame and the second frame, and the thermal insulation layer is a 1 cm thick annular aerogel.

[0019] By adopting the above technical solution, it is convenient to perform thermal insulation through the thermal insulation layer.

[0020] Furthermore, the electric heating wire is made of nickel-chromium alloy and is distributed around the metamaterial electronic skin.

[0021] By adopting the above technical solution, it is convenient to heat the metamaterial electronic skin through the electric heating wire to restore it to its original shape.

[0022] Furthermore, the near-infrared light panel is internally provided with a plurality of LED lamps arranged in a staggered manner, and each LED lamp can emit near-infrared light with a wavelength of 800nm ​​and a power of 0.3W / cm2.

[0023] By adopting the above technical solution, the near-infrared light emitted by the near-infrared light panel can be irradiated on the metamaterial electronic skin.

[0024] Furthermore, the metamaterial electronic skin is a typical intelligent deformable material - shape memory polymer, which has a photothermal effect and can be remotely and precisely guided in space and time through light stimulation. By absorbing near-infrared light, electronic transitions occur in internal metal coordination bonds, and its shape is temporarily programmed by applying a load, and can be restored to its original shape by heating.

[0025] By adopting the above technical solution, it is convenient to obtain the pressure borne, that is, the pre-tension stress of the anchor cable, through the deformation characteristics of the metamaterial electronic skin.

[0026] The specific working principle is: before the operation, the prestressed anchor cable needs to be passed through the anchor cable hole, and then placed on the corresponding pressure-bearing part of the construction structure, and the infrared light switch is turned on. At this time, the near-infrared light panel is staggered with multiple LED lights. Each LED light can emit a near-infrared light with a wavelength of 800nm ​​and a power of 0.3W / cm2, which is vertically irradiated on the surface of the metamaterial electronic skin. The metamaterial electronic skin follows the principle of "light absorption-electronic transition-vibration relaxation". The tensioning jack applies pressure to the pressure hammer, and then transmits the pressure to the metamaterial electronic skin, causing the metamaterial electronic skin to deform. The infrared light switch is turned off to restore the temporary shape fixed at room temperature. The deformation value is collected by the electronic skin sensor and transmitted to the data acquisition and processing module. The pressure borne, that is, the pre-tension stress of the anchor cable, is obtained according to the deformation characteristics of the material. The pre-stress value is fed back to the display screen in real time. After the detection is completed, the metal wire switch is turned on to heat the metamaterial electronic skin to restore its original shape, and the metal wire switch is turned off to complete the detection.

[0027] The beneficial effects of the present invention are:

[0028] 1. By setting the application body, load body, operation panel, power storage box, display screen, thermal insulation layer and near-infrared light board, when the metamaterial electronic skin is deformed by force, the deformation value is collected by the electronic skin sensor and transmitted to the data acquisition and processing module, and the pressure borne, that is, the pre-tension stress of the anchor cable, is obtained according to the deformation characteristics of the material. The pre-stress value is fed back to the display screen in real time. After the detection is completed, the metal wire switch is turned on to heat the metamaterial electronic skin to restore its original shape, and the metal wire switch is turned off to complete the detection;

[0029] 2. Through the irradiation of near-infrared light, the metamaterial electronic skin can be precisely controlled in time and space. The inherent photothermal effect of the metamaterial electronic skin itself can realize the recycling of the prestressed anchor cable detection device. The device itself is light in material, small in size, long in battery life, and accurate in detection. Compared with traditional prestressed detection, it is more efficient and quicker while being accurate in detection, and requires less space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device according to the present invention;

[0031] Figure 2 It is a main cross-sectional view of a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device according to the present invention;

[0032] Figure 3 It is a left view of a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device according to the present invention;

[0033] Figure 4 It is a schematic diagram of the connection relationship between the bracket and the electronic skin sensor in the metamaterial electronic skin anchor prestress self-sensing non-destructive testing device described in the present invention.

[0034] The following are the descriptions of the reference numerals:

[0035] 1. Application body; 101. Near-infrared light board; 102. Metal pipe; 103. Pressure hammer; 104. Telescopic spring; 105. Anchor hole; 106. First rack; 2. Load body; 201. Metamaterial electronic skin; 202. Electronic skin sensor; 203. Electric heating wire; 204. Second rack; 3. Bracket; 4. Infrared light switch; 5. Metal wire switch; 6. Operation panel; 7. Data acquisition and processing module; 8. Display screen; 9. Power box; 10. Thermal insulation layer. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings:

[0037] like Figure 1-Figure 4As shown, a metamaterial electronic skin anchor prestressed self-sensing nondestructive testing device includes an application body 1, a load body 2 is arranged below the application body 1, the application body 1 includes a near-infrared light board 101, a metal tube 102, a pressure hammer 103, a telescopic spring 104, an anchor hole 105 and a first frame 106, the load body 2 includes a metamaterial electronic skin 201, an electronic skin sensor 202, an electric heating wire 203 and a second frame 204, and the light source of the near-infrared light board 101 faces the metamaterial electronic skin 201, the first frame 106 and the second frame 204 are offset, and the metamaterial electronic skin 201, the electronic skin sensor 202 and the electric heating wire 203 are vertically distributed in the second frame 204.

[0038] In this embodiment, there are four groups of metal tubes 102, which are fixed in the first frame 106, and two groups of pressure hammers 103 are vertically arranged in each group of metal tubes 102. The two groups of pressure hammers 103 are connected by telescopic springs 104, and anchor holes 105 are formed on the pressure hammers 103. The telescopic springs 104 can enable the pressure hammers 103 to move downward when under pressure and to freely return to their original positions when no force is applied.

[0039] In this embodiment, the metamaterial electronic skin 201 is a shape memory polyurethane material with photothermal effect and fluorescent properties customized by an engineered metal-phenolic system, and the diameter of the metamaterial electronic skin 201 is slightly smaller than the pressure hammer 103, which facilitates the pressure hammer 103 to act on the metamaterial electronic skin 201.

[0040] In this embodiment, a bracket 3 is fixed in the second frame 204, and the electronic skin sensor 202 is fixed on the bracket 3. The electronic skin sensor 202 corresponds to the position of the metamaterial electronic skin 201, which makes it convenient to support the electronic skin sensor 202 through the bracket 3. The electronic skin sensor 202 collects the deformation value of the metamaterial electronic skin 201 and transmits it to the data acquisition and processing module 7.

[0041] In this embodiment, an infrared light switch 4 and a metal wire switch 5 are installed on one side outside the payload body 2, so as to facilitate the control of the near-infrared light board 101 and the electric heating wire 203 through the infrared light switch 4 and the metal wire switch 5 to work.

[0042] In this embodiment, an operation panel 6 is fixed on one side of the adjacent metal wire switch 5 outside the load body 2, a display screen 8 is installed on the operation panel 6, and a data acquisition and processing module 7 is fixed inside the operation panel 6. A power box 9 is installed on one side of the adjacent operation panel 6 outside the load body 2, which is convenient for the staff to use the operation panel 6 to control the device to work. The display screen 8 can display the detection value, and the data acquisition and processing module 7 can receive and process the detection data of the electronic skin sensor 202.

[0043] In this embodiment, a thermal insulation layer 10 is installed inside the walls of the first frame 106 and the second frame 204 . The thermal insulation layer 10 is a 1 cm thick annular aerogel, which facilitates thermal insulation through the thermal insulation layer 10 .

[0044] In this embodiment, the electric heating wire 203 is made of nickel-chromium alloy and is distributed around the metamaterial electronic skin 201, so that the metamaterial electronic skin 201 can be heated by the electric heating wire 203 to restore its original shape.

[0045] In this embodiment, the near-infrared light board 101 is internally arranged with a plurality of LED lights in a staggered manner, and each LED light can emit near-infrared light with a wavelength of 800nm ​​and a power of 0.3W / cm2, so that the near-infrared light emitted by the near-infrared light board 101 can be irradiated on the metamaterial electronic skin 201.

[0046] In this embodiment, the metamaterial electronic skin 201 is a typical intelligent deformable material - shape memory polymer, which has a photothermal effect and can be remotely and accurately guided in space and time through light stimulation. By absorbing near-infrared light, electronic transitions occur in the internal metal coordination bonds. Its shape is temporarily programmed by applying a load, and it can be restored to its original shape by heating. It is convenient to derive the pressure it is subjected to, that is, the pre-tension stress of the anchor cable, through the deformation characteristics of the metamaterial electronic skin 201.

[0047] The specific working principle is as follows: before the operation, the prestressed anchor cable needs to be passed through the anchor cable hole 105, and then placed on the corresponding pressure-bearing part of the construction structure, and the infrared light switch 4 is turned on. At this time, the near-infrared light panel 101 is arranged with multiple LED lights arranged in a staggered manner. Each LED light can emit near-infrared light with a wavelength of 800nm ​​and a power of 0.3W / cm2, which is vertically irradiated on the surface of the metamaterial electronic skin 201. The metamaterial electronic skin 201 follows the principle of "light absorption-electronic transition-vibration relaxation" and applies pressure to the surface of the metamaterial electronic skin 201 through the tensioning jack. The pressure hammer 103 transmits pressure to the metamaterial electronic skin 201, causing the metamaterial electronic skin 201 to deform, and turns off the infrared light switch 4 to restore the temporary shape fixed at room temperature. The deformation value is collected by the electronic skin sensor 202 and transmitted to the data acquisition and processing module 7. The pressure borne, that is, the pre-tension stress of the anchor cable, is obtained according to the deformation characteristics of the material. The pre-stress value is fed back to the display screen 8 in real time. After the detection is completed, the metal wire switch 5 is turned on to heat the metamaterial electronic skin 201 to restore its original shape, and the metal wire switch 5 is turned off to complete the detection.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device, characterized by: The invention comprises an application body (1), a load body (2) is arranged below the application body (1), the application body (1) comprises a near-infrared light board (101), a metal tube (102), a pressure hammer (103), a telescopic spring (104), an anchor hole (105) and a first frame (106), the load body (2) comprises a metamaterial electronic skin (201), an electronic skin sensor (202), an electric heating wire (203) and a second frame (204), and the light source of the near-infrared light board (101) faces the metamaterial electronic skin (201), the first frame (106) and the second frame (204) are opposed to each other, and the metamaterial electronic skin (201), the electronic skin sensor (202) and the electric heating wire (203) are vertically distributed in the second frame (204).

2. According to claim 1, a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device is characterized by: There are four groups of the metal tubes (102) in total. The metal tubes (102) are fixed in the first frame (106), and two groups of pressure hammers (103) are vertically arranged in each group of the metal tubes (102). The two groups of pressure hammers (103) are connected via the telescopic springs (104), and the anchor cable holes (105) are formed on the pressure hammers (103).

3. According to claim 1, a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device is characterized by: The metamaterial electronic skin (201) is a shape memory polyurethane material with photothermal effect and fluorescent properties customized from an engineering metal-phenolic system, and the diameter of the metamaterial electronic skin (201) is slightly smaller than that of the pressure hammer (103).

4. According to claim 1, a metamaterial electronic skin anchor cable prestressed self-sensing nondestructive testing device is characterized by: A bracket (3) is fixed inside the second frame (204), and the electronic skin sensor (202) is fixed on the bracket (3), and the electronic skin sensor (202) corresponds to the position of the metamaterial electronic skin (201).

5. According to claim 1, a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device is characterized by: An infrared light switch (4) and a metal wire switch (5) are installed on one side outside the load body (2).

6. According to claim 5, a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device is characterized by: An operation panel (6) is fixed on the outside of the load body (2) adjacent to the metal wire switch (5), a display screen (8) is installed on the operation panel (6), and a data acquisition and processing module (7) is fixed inside the operation panel (6), and a power supply box (9) is installed on the outside of the load body (2) adjacent to the operation panel (6).

7. According to claim 4, a metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device is characterized by: A thermal insulation layer (10) is installed inside the walls of the first frame (106) and the second frame (204), and the thermal insulation layer (10) is a 1 cm thick annular aerogel.

8. The metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device according to claim 1 is characterized by: The electric heating metal wire (203) is made of nickel-chromium alloy and is distributed around the metamaterial electronic skin (201).

9. The metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device according to claim 1 is characterized by: The near-infrared light panel (101) comprises a plurality of LED lights arranged in a staggered manner, and each LED light is capable of emitting near-infrared light with a wavelength of 800 nm and a power of 0.3 W / cm2.

10. The metamaterial electronic skin anchor cable prestress self-sensing nondestructive testing device according to claim 1, characterized in that: The metamaterial electronic skin (201) is a typical intelligent deformable material, a shape memory polymer, which has a photothermal effect and can be remotely and precisely guided in space and time by light stimulation. By absorbing near-infrared light, electronic transitions occur in internal metal coordination bonds, and its shape is temporarily programmed by applying a load, and can be restored to its original shape by heating.

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