Nested electromagnetic induction coil sensor
The nested electromagnetic induction coil sensor solves the accuracy problem in detecting densely reinforced areas through the design of the inner coil and insulation layer, achieving higher measurement accuracy.
Patent Information
- Application Number
- CN202520283722.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-21
AI Technical Summary
When existing electromagnetic induction devices are used in areas with dense reinforcement, they are easily interfered with by adjacent reinforcement bars, affecting the accuracy of the detection results.
A nested electromagnetic induction coil sensor is adopted, which includes an inner coil, an insulating layer, and an outer coil. The annular gap is eliminated, and the insulating layer is used instead of the outer cylinder. The diameter of the outer coil is reduced, the magnetic field coverage is narrowed, and the measurement accuracy is improved.
By reducing the magnetic field coverage of the outer coil, interference from adjacent reinforcing bars is reduced, thus improving the accuracy of the detection results.
Smart Images
Figure CN223710542U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to reinforcing steel bar measurement technical field, in particular to a nested electromagnetic induction coil sensor. BACKGROUND
[0002] In order to guarantee construction quality, it is usually needed to detect the reinforcing steel bar protection layer thickness and reinforcing steel bar diameter through electromagnetic induction device after construction completion. The electromagnetic induction device includes electromagnetic induction module and calculation module, and the electromagnetic induction module includes primary coil and secondary coil. The primary coil is used to generate the varying magnetic field, and the reinforcing steel bar generates the induced current. The induced current in the reinforcing steel bar generates the varying magnetic field in the vicinity, and the secondary coil generates the induced current. The calculation module collects the relevant parameters of the induced current in the secondary coil, carries out the calculation, and obtains the corresponding data such as reinforcing steel bar diameter.
[0003] At present, the electromagnetic induction module of the electromagnetic induction device has larger coverage range, and when detecting a reinforcing steel bar in the reinforcing steel bar dense area, the reinforcing steel bar is easily interfered by the adjacent reinforcing steel bar, and the accuracy of the detection result is influenced. SUMMARY
[0004] The utility model discloses a nested electromagnetic induction coil sensor to solve the problems of the above related technologies, improve the accuracy of the detection result.
[0005] To achieve the above object, the utility model provides the following scheme:
[0006] The utility model discloses a nested electromagnetic induction coil sensor, including electromagnetic induction module, the electromagnetic induction module includes a plurality of sensing units, and the sensing unit includes cylinder, inner layer coil, insulating layer and outer layer coil.
[0007] Preferably, the number of sensing units is two, the inner layer coil of two sensing units is electrically connected in series, the outer layer coil of two sensing units is electrically connected in series, the axis of the cylinder of two sensing units is parallel, and the end of the cylinder of two sensing units is aligned.
[0008] Preferably, the center distance of the inner layer coil of two sensing units is 35-45mm.
[0009] Preferably, the nested electromagnetic induction coil sensor further comprises an excitation module, a collection module and a processing module; the excitation module is electrically connected with the outer coil to output pulse current to the outer coil; the collection module is electrically connected with the inner coil to collect voltage data of the pulse current in the inner coil; and the processing module is electrically connected with the collection module to calculate the voltage data collected by the collection module.
[0010] Preferably, the excitation module comprises a pulse generator and a power amplifier, the pulse generator is electrically connected with the power amplifier, and the power amplifier is electrically connected with the outer coil.
[0011] Preferably, the collection module comprises an oscilloscope.
[0012] Preferably, the outer diameter of the section of the cylinder corresponding to the inner coil is 25-35 mm, and the outer diameter of the insulating layer is 35-45 mm.
[0013] Preferably, the axial length of the cylinder is 20-30 mm.
[0014] Preferably, the diameter of the enameled wire used to wind the inner coil is 0.2-0.4 mm, and the diameter of the enameled wire used to wind the outer coil is 0.3-0.5 mm.
[0015] Preferably, the number of turns of the inner coil is 380-420 turns, and the number of turns of the outer coil is 330-370 turns.
[0016] The utility model discloses relative to relevant technical achievement following technical effect has been obtained:
[0017] In the nested electromagnetic induction coil sensor, the induction unit not only saves the annular gap, but also uses the insulating layer to replace the outer cylinder to reduce the diameter of the outer coil as far as possible, reduce the coverage of the induced magnetic field excited by the pulse current in the outer coil, and improve the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technical scheme, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0019] Figure 1 It is the front view of the cylinder;
[0020] Figure 2 It is the left view of the cylinder;
[0021] Figure 3 Fig. 1 is a schematic diagram of the positional relationship of the inner coil, the insulation layer and the outer coil;
[0022] Figure 4 Fig. 2 is a schematic diagram of one perspective view of the electromagnetic induction module in a working state;
[0023] Figure 5 Fig. 3 is a schematic diagram of another perspective view of the electromagnetic induction module in a working state.
[0024] In the figure: 1-cylinder; 2-inner coil; 3-insulation layer; 4-outer coil; 5-stop edge; 6-first through hole; 7-second through hole; 8-steel bar. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0026] The purpose of the present application is to provide a nested electromagnetic induction coil sensor to solve the problems in the above-mentioned related technologies and improve the accuracy of detection results.
[0027] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.
[0028] Referring to Figures 1-5 The present embodiment provides a nested electromagnetic induction coil sensor, which comprises an electromagnetic induction module, the electromagnetic induction module comprises a plurality of sensing units, the sensing unit comprises a cylinder 1, an inner coil 2, an insulation layer 3 and an outer coil 4. The inner coil 2 is wound outside the cylinder 1, the insulation layer 3 is wound outside the inner coil 2, and the outer coil 4 is wound outside the insulation layer 3.
[0029] The working principle of the nested electromagnetic induction coil sensor of the present embodiment is as follows:
[0030] After the pulse current is generated in the outer coil 4, a first magnetic field varying in the vicinity is generated, and an induced current (eddy current) caused by the varying magnetic field is generated in the steel bar 8. At the same time, the induced current in the steel bar 8 also generates a second magnetic field varying in the vicinity. Under the superimposed influence of the first magnetic field and the second magnetic field, an induced current is generated in the inner coil 2. The parameters of the first magnetic field are determined, and the parameters of the second magnetic field are affected by the induced current in the steel bar 8. When the parameters of the second magnetic field change, the induced current in the inner coil 2 also changes accordingly. Therefore, by monitoring the induced current (or induced voltage) in the inner coil 2, data related to the induced current in the steel bar 8 can be obtained.
[0031] The induced current in the steel bar 8 is not only affected by the electrical conductivity and magnetic permeability of the steel bar 8, but also related to the amplitude and frequency of the excitation voltage of the outer coil 4 and the distance between the steel bar 8 and the electromagnetic induction module. Under the condition that the other parameters remain unchanged, only the relative position between the electromagnetic induction module and the steel bar 8 is changed, and the variable affecting the induced voltage of the inner coil 2 is only the distance between the sensor and the steel bar 8. According to the above principle, the nested electromagnetic induction coil sensor can detect the thickness of the protective layer of the steel bar 8 concrete.
[0032] Similarly, under the condition that the thickness of the protective layer remains unchanged, the change of the induced voltage of the inner coil 2 is affected by the diameter of the steel bar 8. Therefore, the nested electromagnetic induction coil sensor can also measure the consistency of the diameter of the steel bar 8 under the same protective layer.
[0033] It should be noted that for the existing nested electromagnetic induction coil sensor, the outer coil is wound on the outer cylinder, the inner coil is wound on the inner cylinder, and the outer cylinder and the inner cylinder are fixedly connected. In addition to the outer cylinder, there is also an annular gap inside the outer cylinder between the outer coil and the inner coil. The diameter of the outer coil of the electromagnetic induction module with this structure is relatively large, so the coverage range of the first magnetic field generated by the outer coil is relatively large, which can affect more steel bars. In the area where the steel bars are relatively dense, when using this electromagnetic induction module, the induced current in the inner coil is not only affected by the steel bar to be measured, but also affected by the adjacent steel bars, thereby interfering with the measurement results of the adjacent steel bars.
[0034] In the present embodiment, not only is the annular gap omitted, but also the insulating layer 3 is used instead of the outer cylinder, so as to reduce the diameter of the outer coil 4 as much as possible and reduce the coverage range of the first magnetic field excited by the pulse current inside the outer coil 4, thereby improving the measurement accuracy.
[0035] As a possible example, in the present embodiment, the number of sensing units is two. The inner coils 2 of the two sensing units are electrically connected in series, and the outer coils 4 of the two sensing units are electrically connected in series. The axes of the cylinders 1 of the two sensing units are parallel, and the ends of the cylinders 1 of the two sensing units are aligned.
[0036] For each induction unit, an equation of the induction voltage in the inner coil 2 and the induction voltage influencing factors (such as the diameter of the steel bar, the thickness of the protective layer) can be established. By solving the two equations simultaneously, the corresponding influencing factors can be solved. The relevant calculation process is known in the art, which will not be described here.
[0037] Taking the surface of the building as the XY plane, the steel bar 8 is parallel to the X axis. In actual use, the axis of the cylinder 1 is parallel to the Z axis, and the connecting line of the two cylinders 1 is parallel to the X axis. Keep the distance between the cylinder 1 and the surface of the building unchanged, and translate the electromagnetic induction module along the direction parallel to the Y axis. As the distance between the electromagnetic induction module and the steel bar 8 decreases, the induced current and induced voltage in the inner coil 2 gradually increase. When the induced current and induced voltage in the inner coil 2 are maximum, the axis of the cylinder 1 is perpendicular to the steel bar 8, that is, the electromagnetic induction module is directly opposite the steel bar 8. At this time, keep the position of the electromagnetic induction module unchanged, and read the measurement results of the nested electromagnetic induction coil sensor.
[0038] When the electromagnetic induction module is directly opposite the steel bar 8, the steel bar 8 is viewed along the axis of the cylinder 1. In this view, the inner coil 2 and the outer coil 4 are both wound in the counterclockwise direction by the corresponding enameled wire.
[0039] As a possible example, in the embodiment, the center distance of the inner coils 2 of the two induction units is 35-45 mm. For example, the center distance of the inner coils 2 of the two induction units is preferably 40 mm.
[0040] As a possible example, in the embodiment, the nested electromagnetic induction coil sensor further includes an excitation module, a collection module and a processing module. The excitation module is electrically connected to the outer coil 4 to output a pulse current to the outer coil 4. The collection module is electrically connected to the inner coil 2 to collect the voltage data of the pulse current in the inner coil 2. The processing module is electrically connected to the collection module to calculate the voltage data collected by the collection module.
[0041] The pulse current generated by the excitation module reaches the outer coil 4, generating a changing first magnetic field in the surrounding space, which causes an induced current in the steel bar 8 caused by the changing magnetic field. At the same time, the induced current inside the steel bar 8 also generates a changing second magnetic field in the surrounding space. Under the superimposed influence of the changing first magnetic field and the second magnetic field, an induced current is generated in the inner coil 2. The collection module collects the induced voltage of the inner coil 2 and transmits the data to the processing module for subsequent calculation by the processing module.
[0042] As a possible example, in the embodiment, the excitation module includes a pulse generator and a power amplifier, the pulse generator is electrically connected to the power amplifier, and the power amplifier is electrically connected to the outer coil 4.
[0043] The excitation module is used to generate a pulse current, which, after being amplified by the power amplifier, reaches the outer coil 4.
[0044] As a possible example, in the embodiment, the acquisition module comprises an oscilloscope.
[0045] As a possible example, in the embodiment, the outer diameter of the section of the cylinder 1 corresponding to the inner coil 2 is 25-35 mm, and the outer diameter of the insulating layer 3 is 35-45 mm. As an example, the outer diameter of the section of the cylinder 1 corresponding to the inner coil 2 is preferably 30 mm, and the outer diameter of the insulating layer 3 is preferably 40 mm.
[0046] As a possible example, in the embodiment, the axial length of the cylinder 1 is 20-30 mm. As an example, the axial length of the cylinder 1 is preferably 25 mm.
[0047] As a possible example, in the embodiment, the diameter of the enameled wire used to wind the inner coil 2 is 0.2-0.4 mm, and the diameter of the enameled wire used to wind the outer coil 4 is 0.3-0.5 mm. As an example, the diameter of the enameled wire used to wind the inner coil 2 is preferably 0.3 mm, and the diameter of the enameled wire used to wind the outer coil 4 is preferably 0.4 mm.
[0048] As a possible example, in the embodiment, the number of turns of the inner coil 2 is 380-420 turns, and the number of turns of the outer coil 4 is 330-370 turns. As an example, the number of turns of the inner coil 2 is preferably 400 turns, and the number of turns of the outer coil 4 is preferably 350 turns.
[0049] As a possible example, in the embodiment, the cylinder 1 is provided with a flange 5 at each end, and the flange 5 is provided with a first through hole 6 and a second through hole 7. The inner coil 2 is led out through the first through hole 6, and the outer coil 4 is led out through the second through hole 7.
[0050] The principle and implementation mode of the specific examples are described in the utility model, and the above examples are only used to help understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A nested electromagnetic induction coil sensor, comprising an electromagnetic induction module, characterized in that, The electromagnetic induction module includes several induction units, each of which includes a cylinder, an inner coil, an insulating layer, and an outer coil. The inner coil is wound around the outside of the cylinder, the insulating layer is wound around the outside of the inner coil, and the outer coil is wound around the outside of the insulating layer.
2. The nested electromagnetic induction coil sensor according to claim 1, characterized in that: The number of the sensing units is two; the inner coils of the two sensing units are electrically connected in series, and the outer coils of the two sensing units are electrically connected in series; the axes of the cylinders of the two sensing units are parallel, and the ends of the cylinders of the two sensing units are aligned.
3. The nested electromagnetic induction coil sensor according to claim 2, characterized in that: The center distance between the inner coils of the two sensing units is 35-45 mm.
4. The nested electromagnetic induction coil sensor according to claim 1, characterized in that: It also includes an excitation module, a data acquisition module, and a processing module; the excitation module is electrically connected to the outer coil to output a pulse current to the outer coil; the data acquisition module is electrically connected to the inner coil to acquire voltage data of the pulse current in the inner coil; the processing module is electrically connected to the data acquisition module to calculate the voltage data acquired by the data acquisition module.
5. The nested electromagnetic induction coil sensor according to claim 4, characterized in that: The excitation module includes a pulse generator and a power amplifier. The pulse generator is electrically connected to the power amplifier, and the power amplifier is electrically connected to the outer coil.
6. The nested electromagnetic induction coil sensor according to claim 4, characterized in that: The acquisition module includes an oscilloscope.
7. The nested electromagnetic induction coil sensor according to claim 1, characterized in that: The outer diameter of the section on the cylinder corresponding to the inner coil is 25-35 mm, and the outer diameter of the insulating layer is 35-45 mm.
8. The nested electromagnetic induction coil sensor according to claim 1, characterized in that: The axial length of the cylinder is 20-30 mm.
9. The nested electromagnetic induction coil sensor according to claim 1, characterized in that: The diameter of the enameled wire used to wind the inner coil is 0.2 to 0.4 mm, and the diameter of the enameled wire used to wind the outer coil is 0.3 to 0.5 mm.
10. The nested electromagnetic induction coil sensor according to claim 1, characterized in that: The inner coil has 380 to 420 turns, and the outer coil has 330 to 370 turns.