Non-contact iron object positioning detection and marking system

Abstract

The invention discloses a non-contact iron object positioning detection and marking system, which is particularly suitable for a building template embedded nut positioning scene. The system transmits an alternating magnetic field through the electromagnetic induction module to penetrate through a non-metal obstacle (such as a wood board), detects an eddy current effect generated by an iron object (such as a pre-embedded nut) and outputs a 0-10V voltage signal; the central processing unit locks the geometric center position of the object according to the minimum voltage value, and realizes multi-mode feedback through visual color circle zooming, buzzing frequency change and threshold alarm; and after the user triggers the marking key, the execution module automatically performs annular mark marking at the position of the central point. According to the scheme, the problems of penetrability accurate positioning and automatic marking of hidden iron objects are solved, and the construction efficiency and safety are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of industrial automation testing technology, and is particularly applicable to a system for non-contact precise positioning and marking of iron embedded parts (such as nuts and bolts) covered by formwork in building construction. Background Technology

[0002] In building construction, the reinforcing cage serves as the core load-bearing skeleton of the concrete structure. The pre-installed embedded nuts on the cage are crucial for the subsequent installation of bolts and the achievement of structural connections. According to construction specifications, after the formwork of the reinforcing cage is installed, holes must be drilled in the formwork according to the precise positions of the embedded nuts to ensure accurate alignment during the subsequent installation of bolts. This directly affects the stability of the structural connection and construction efficiency.

[0003] However, in actual construction, the installed formwork completely obscures the embedded nuts on the reinforcing cage, rendering traditional manual marking or contact measurement methods ineffective. Because the planar coordinates of the nuts cannot be visually confirmed, relying solely on experience or rough estimation of the opening position can easily lead to misalignment between the opening and the embedded nuts. This can result in minor issues such as the inability to install the bolts properly, requiring rework and increasing construction costs and time; or more serious issues such as damaging the embedded structure due to forced installation, affecting the overall structural integrity of the building and creating safety hazards. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a non-contact ferrous object positioning, detection, and marking system, comprising: Electromagnetic induction module: used to emit an alternating magnetic field to penetrate non-metallic obstacles, sense the eddy current effect of ferrous objects and output a 0-10V analog voltage signal; the voltage signal is 10V when there is no ferrous object, decreases when near the edge of the object, and reaches the minimum value at the center of the object. Central processing unit: Receives voltage signals and determines the geometric center of the ferrous object by identifying the minimum voltage value; Feedback module: includes visual feedback unit, auditory feedback unit and threshold alarm unit; The visual feedback unit displays a dynamic color ring on the screen. The diameter of the color ring decreases as the voltage decreases, and the center point corresponds to the smallest color ring. The auditory feedback unit increases the frequency of the buzzer as the voltage decreases; The threshold alarm unit triggers a red display on the screen and a continuous buzzer sound when the voltage is lower than a set threshold. Execution module: In response to user-triggered signals, it automatically performs a marking operation at the center point of the iron object.

[0005] Preferably, the execution module includes: an electromagnet-driven annular stamp mechanism, which attracts an iron sheet to press down the stamp when energized, forming an annular mark on the template surface; A reset spring is used to reset the seal when the electromagnet is de-energized.

[0006] Preferably, the diameter of the color ring of the visual feedback unit satisfies the formula: D = D_max × (V_actual / 10), where D_max is the maximum diameter and V_actual is the real-time voltage value.

[0007] Preferably, the buzzing frequency of the auditory feedback unit satisfies the formula: f = f_max × (1 - V_actual / 10), where f_max is the highest frequency.

[0008] Preferably, the electromagnetic induction module uses a high-frequency eddy current sensor with a working frequency of 100kHz–1MHz, which can penetrate ≥20mm wooden boards to detect iron objects with a diameter ≥45mm.

[0009] Preferably, the threshold value set for the threshold alarm unit is 1.5V–2.0V.

[0010] Preferably, the system is used for template positioning marking of pre-embedded nuts in steel cages during building construction.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Achieves non-contact positioning by penetrating non-metallic obstacles, with an accuracy of ±1mm; 2. Multimodal feedback provides intuitive operation guidance, reducing human error; 3. One-click automatic marking improves construction efficiency by over 50%; 4. Applicable to scenarios such as building and container inspection. Attached Figure Description

[0012] Figure 1-2 This is an exploded structural diagram of the instrument to which this invention applies; Figure 3 This is a diagram showing the working state of the instrument to which this invention applies. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] like Figure 1-3As shown, this embodiment proposes a non-contact ferrous object positioning, detection, and marking system, including: Electromagnetic induction module: used to emit an alternating magnetic field to penetrate non-metallic obstacles, sense the eddy current effect of ferrous objects and output a 0-10V analog voltage signal; the voltage signal is 10V when there is no ferrous object, decreases when near the edge of the object, and reaches the minimum value at the center of the object. Central processing unit: Receives voltage signals and determines the geometric center of the ferrous object by identifying the minimum voltage value; Feedback module: includes visual feedback unit, auditory feedback unit and threshold alarm unit; The visual feedback unit displays a dynamic color ring on the screen. The diameter of the color ring decreases as the voltage decreases, and the center point corresponds to the smallest color ring. The auditory feedback unit increases the frequency of the buzzer as the voltage decreases; The threshold alarm unit triggers a red display on the screen and a continuous buzzer sound when the voltage is lower than a set threshold. Execution module: In response to user-triggered signals, it automatically performs a marking operation at the center point of the iron object.

[0015] In this embodiment, the hardware configuration is as follows: Sensor: A high-frequency eddy current sensor is selected (e.g., LC oscillation circuit, frequency 100kHz–1MHz); the probe is directly facing the wooden board, with a detection depth ≥20mm, and the target iron block diameter is 45mm. Signal processing: The voltage conversion circuit linearly maps the induced signal to 0–10V; typical value of the center point voltage: 1.5V (actual value needs calibration). Execution unit: The marking device adopts a pneumatic needle / laser marking head, coaxially mounted with the sensor.

[0016] The workflow is as follows: First, scanning and detection: the moving sensor scans the surface of the wooden board, and the output voltage drops in real time, indicating that it is close to the iron block; second, center determination: when the voltage drops to the global minimum value and remains stable, the processor determines that it is the center of the iron block; if this value is less than the set threshold (e.g., 2.0V), a red alarm is triggered with a long beep; then, marking is executed: the user presses the marking button, the system records the current position coordinates and drives the marking device to move; it also includes dynamic feedback: the color ring diameter calculation formula is: D=D_max * (V_actual / 10) (V_actual: real-time voltage); the buzzer frequency is: f=f_max * (1-V_actual / 10) (e.g., f_max=5kHz).

[0017] The system in this embodiment uses an instrument that moves a non-contact probe (electromagnetic induction) on the template 1 to detect the precise position of the pre-embedded bolt 2 in real time. When the instrument detects the exact center of the bolt 2, the screen 3 displays a dynamic focus point (such as a bright crosshair or a ring mark), indicating to the operator that the target has been aligned. At this time, the operator presses the switch 4, and the ring stamp 5 automatically extends from the bottom of the instrument to accurately mark the center position of the bolt 2 on the surface of the template 1, facilitating subsequent drilling or construction positioning. Each time the operator presses the switch 4, the electromagnet 6 is energized, and the magnetic force attracts the iron plate 7 above to fall (while the compression spring 8 is compressed), causing the ring stamp 5 to press down, leaving a ring mark on the template 1. When the electromagnet 6 is de-energized, the ring stamp 5 returns to its original position under the action of the compression spring 8.

[0018] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-contact system for locating, detecting, and marking ferrous objects, characterized in that, include: Electromagnetic induction module: used to emit an alternating magnetic field to penetrate non-metallic obstacles, sense the eddy current effect of ferrous objects and output a 0-10V analog voltage signal; the voltage signal is 10V when there is no ferrous object, decreases when near the edge of the object, and reaches the minimum value at the center of the object. Central processing unit: Receives voltage signals and determines the geometric center of the ferrous object by identifying the minimum voltage value; Feedback module: includes visual feedback unit, auditory feedback unit and threshold alarm unit; The visual feedback unit displays a dynamic color ring on the screen. The diameter of the color ring decreases as the voltage decreases, and the center point corresponds to the smallest color ring. The auditory feedback unit increases the frequency of the buzzer as the voltage decreases; The threshold alarm unit triggers a red display on the screen and a continuous buzzer sound when the voltage is lower than a set threshold. Execution module: In response to user-triggered signals, it automatically performs a marking operation at the center point of the iron object.

2. The system according to claim 1, characterized in that, The execution module includes: an electromagnet-driven annular stamp mechanism, which attracts an iron sheet when energized, causing the stamp to press down and form an annular mark on the template surface; A reset spring is used to reset the seal when the electromagnet is de-energized.

3. The system according to claim 1, characterized in that, The diameter of the color ring of the visual feedback unit satisfies the formula: D = D_max × (V_actual / 10), where D_max is the maximum diameter and V_actual is the real-time voltage value.

4. The system according to claim 1, characterized in that, The buzzing frequency of the auditory feedback unit satisfies the formula: f = f_max × (1 - V_actual / 10), where f_max is the highest frequency.

5. The system according to claim 1, characterized in that, The electromagnetic induction module uses a high-frequency eddy current sensor with a working frequency of 100kHz–1MHz, which can penetrate ≥20mm wooden boards to detect iron objects with a diameter ≥45mm.

6. The system according to claim 1, characterized in that, The threshold value set for the threshold alarm unit is 1.5V–2.0V.

7. The system according to claim 1, characterized in that, The system is used for template positioning marking of pre-embedded nuts in steel cages during building construction.

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