Intelligent magnetic field steel fiber gradient orientation device

Abstract

The invention discloses an intelligent magnetic field steel fiber gradient orientation device. The device comprises an insulating framework, a framework connecting hoop, an ultrasonic sensor, a direct-current power supply controller and an ultrasonic detection module. The number of the insulation frameworks is two, the two insulation frameworks are of a half-and-half opening and closing structure, the two combined frameworks form a rectangular cavity, wires on the frameworks are mutually combined through connecting contact pieces to form a whole, a constant magnetic field is generated after electrification, an ultrasonic sensor storage position is reserved in the center of each framework, and a sensor is connected with a detector through a circuit. Actual fiber distribution is detected according to ultrasonic waves, the magnetic field intensity is adjusted in real time, the steel fibers are orderly arranged in the concrete beam according to the preset dip angle, the fiber utilization rate is increased, and the bending and shearing resistance of components is improved. The technology can improve the fiber reinforcement efficiency by more than 30%, is suitable for key load-bearing members such as bridges and building beam columns, and has a wider application range.

Description

Technical Field

[0001] The invention provides an intelligent magnetic field steel fiber gradient orientation device, belonging to the technical field of building construction. Background Art

[0002] With the development of the construction industry, the use of steel fiber-reinforced building materials such as cement, concrete, and mortar has significantly improved the mechanical properties and durability of these materials. In recent years, magnetic field orientation technology has attracted considerable attention as a novel fiber control method. By applying an external magnetic field, the ferromagnetic properties of steel fibers can be exploited to actively manipulate their spatial distribution and orientation, thereby forming an aligned structure and significantly improving the material's anisotropic mechanical properties (e.g., tensile strength along a specific direction). Meanwhile, ultrasonic testing, a mature nondestructive testing method, has been used to assess internal defects (e.g., cracks and pores) and structural uniformity in materials. Its principle is to infer internal structural information by analyzing the propagation characteristics of ultrasound in the material (e.g., sound velocity, attenuation coefficient, and scattering signal). Currently, magnetic field orientation and ultrasonic testing are still being independently researched in the field of steel fiber-reinforced materials, and their integration has not been fully explored. If ultrasound can provide real-time feedback on fiber distribution and orientation, and dynamically adjust magnetic field parameters (e.g., intensity, direction, and frequency) accordingly, a closed-loop control process could be established, significantly improving fiber orientation accuracy and material performance consistency. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides an intelligent magnetic field steel fiber gradient orientation device.

[0004] The present invention adopts the following technical solutions:

[0005] An intelligent magnetic field steel fiber gradient orientation device, the use of the present invention specifically includes the following steps:

[0006] Step 1: Prepare the insulation frame according to the height of the concrete beam and reserve enough space for placement.

[0007] Step 2: Assemble the strip wire block on the outer wall of the frame and embed the ultrasonic sensor on the inner wall.

[0008] Step 3: Combine and splice the two insulating skeletons through the skeleton connecting hoop, and connect the wire blocks to each other through the contact pieces to form a closed path.

[0009] Step 4: Turn on the power to generate a constant magnetic field in the rectangular space, so that the disordered steel fibers are arranged along the direction of the magnetic field, and connect the ultrasonic transmitter and ultrasonic receiver to the detector with a line.

[0010] Step 5: Divide and orient the area of the concrete beam, and observe the ultrasonic detector data after orientation is completed.

[0011] Step 6: Through ultrasonic data feedback, make real-time adjustments to areas that do not meet expectations, and change the magnetic field size by adjusting the current size so that the steel fibers are arranged in an orderly manner at a preset inclination angle in the concrete beam.

[0012] The present invention describes an intelligent magnetic field steel fiber gradient orientation device, comprising an insulating frame, a frame connecting hoop, an ultrasonic sensor, a DC power controller, and an ultrasonic detection module. The insulating frame comprises two frames, split in half. When combined, the two frames form a rectangular cavity. The wires on the frames are connected to each other via connecting pads, forming a single unit. When energized, a constant magnetic field is generated. A location for the ultrasonic sensor is reserved at the center of the frame. The sensor is connected to a detector via wiring. Based on the actual distribution of the ultrasonically detected fibers, the magnetic field strength is adjusted in real time to ensure that the steel fibers are aligned at a predetermined angle within the concrete beam.

[0013] The present invention offers the following advantages: The device requires no rewinding of coils or pre-designed fixed coils during construction. After modular assembly, the coils form a pathway, and upon connection to a power source, a corresponding magnetic field is generated. The embedded design of the ultrasonic sensor and magnetic field generator allows for real-time adjustment of the magnetic field intensity, ensuring that the steel fibers are aligned within the concrete beam at a predetermined angle. The device is simple to operate and reusable, making it suitable for various steel fiber concrete pouring and construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the device of the present invention

[0015] Figure 2 A cross-section of the device of the present invention and a schematic diagram of the placement of the ultrasonic sensor

[0016] Figure 3 This is a schematic diagram of the specific connection of the conductor block of the device of the present invention

[0017] Figure 4 Schematic diagram of steel fiber pretreatment of this beam under a constant magnetic field

[0018] Figure 5 Schematic diagram of the beam's orientation area division and orientation results DETAILED DESCRIPTION

[0019] The present invention is further described below with reference to specific embodiments.

[0020] The present invention provides an intelligent magnetic field steel fiber gradient orientation device, the specific operation is as follows:

[0021] Step 1: Prepare concrete samples and measure steel fiber parameters

[0022] The gel material used in this study was P042.5 cement, the aggregates used were natural sand and gravel (5-20 mm), and the water reducer was a polycarboxylic acid-based high-performance water reducer (approximately 0.95%). The basic components of strength grade C30 concrete can be found in Table 1.

[0023]

[0024] Table 1 Concrete composition Straight microfilament copper-coated steel fiber was used in this experiment, and its basic parameters can be seen in Table 2.

[0025] type Geometric shapes Length (mm) Diameter (mm) Flexural strength (MPa) Steel Fiber Straight 30 0.5 ≧2000MPa

[0026] Table 2 Steel fiber information

[0027] Step 2: Pre-test processing

[0028] (1) An insulating frame is prepared according to the height of the prepared concrete, and the thickness of the frame is 30 mm.

[0029] (2) A strip conductor block is assembled on the outer wall of the frame, and an ultrasonic sensor is embedded in the inner wall.

[0030] (3) The two insulating frames are combined and spliced together through the frame connecting hoop, and the wire blocks are connected to each other through contact pieces to form a closed path.

[0031] (4) Connect the ultrasonic transmitter and the ultrasonic receiver to the detector with lines.

[0032] (5) Divide the detection area (I to VIII) to facilitate subsequent data collection.

[0033] Step 3: Steel fiber pretreatment under constant magnetic field

[0034] Placing the specimen in a constant magnetic field environment causes the disordered steel fibers to align along the direction of the magnetic field.

[0035] Step 4: Magnetic field loading and data acquisition

[0036] (1) Setting magnetic field strength: See Table 3 for strength in different regions.

[0037] Detection area Ⅰ Ⅱ Ⅲ Ⅳ Magnetic field size 0.8(T) 0.5(T) 0.3(T) 0.1(T) Detection area Ⅴ Ⅵ Ⅶ Ⅷ Magnetic field size 0.1(T) 0.3(T) 0.5(T) 0.8(T)

[0038] Table 3 Regional intensity

[0039] Each intensity is maintained stably for 5 minutes to ensure that the steel fiber is fully deflected, among which the currents of V to VIII and I to IV remain unchanged in magnitude and are opposite in direction.

[0040] (2) Ultrasonic testing: For each magnetic field strength B, ultrasonic pulses were emitted while directional, and the time domain waveforms were collected. The arrival time of the first wave, signal amplitude, and spectral characteristics were recorded. The measurement was repeated five times, and outliers were eliminated. Specific data can be found in Table 4.

[0041]

[0042]

[0043] Table 4 Measurement results

[0044] Analyze the data collected above to determine whether the steel fibers have achieved the desired deflection angle. If not, adjust the magnetic field strength promptly. As shown in Table 4, as the steel fiber deflection angle increases, the angle with the acoustic wave propagation direction increases, fiber-matrix interface scattering in the acoustic wave path increases, signal amplitude decreases, high-frequency components decay more rapidly, and the main frequency of the spectrum shifts toward low frequencies. Analysis of this data shows that if the angle of deflection in the measured area is too large, the magnetic field direction can be changed by reversing the current to achieve the preset angle alignment. If the angle is too small, the current can be increased, thereby increasing the magnetic field to achieve the desired deflection.

Claims

1. An intelligent magnetic field steel fiber gradient orientation device, characterized by: The device comprises an insulating frame, a frame connecting collar, an ultrasonic sensor, a DC power supply controller, and an ultrasonic detection module. The insulating frames consist of two, split-half frames, forming a rectangular cavity. Connecting collars are provided at each end of the insulating frame to ensure a secure closure. The ultrasonic detection module comprises an ultrasonic transmitter, an ultrasonic receiver, and a detector. A space is reserved in the center of the insulating frame for the ultrasonic sensor, which is connected to the detector via wiring.

2. The intelligent magnetic field steel fiber gradient orientation device according to claim 1 is characterized in that: The insulating frame is formed by a plurality of strip-shaped wires arranged in sequence. The ends of the strip-shaped wires are connected by inwardly concave connecting contacts, and the tails are connected by outwardly protruding connecting contacts.

3. The intelligent magnetic field steel fiber gradient orientation device according to claim 1 is characterized in that: The ultrasonic sensor is embedded in the electromagnetic coil to form a whole, so that the magnetic field is applied and the fiber distribution is detected simultaneously. The arrangement direction of the sensor is perpendicular to the magnetic field direction to avoid interference of the magnetic field on the ultrasonic signal.

4. The intelligent magnetic field steel fiber gradient orientation device according to claim 1, wherein the ultrasonic detection module determines the fiber direction by the time-domain integrated area of the acoustic wave velocity.

5. The intelligent magnetic field steel fiber gradient orientation device according to claim 1 is characterized in that: The following steps are involved: Step 1: Prepare the insulation frame according to the height of the concrete beam and reserve enough space for placement. Step 2: Assemble the strip wire block on the outer wall of the frame and embed the ultrasonic sensor on the inner wall. Step 3: Combine and splice the two insulating skeletons through the skeleton connecting hoop, and connect the wire blocks to each other through the contact pieces to form a closed path. Step 4: Turn on the power to generate a constant magnetic field in the rectangular space, so that the disordered steel fibers are arranged along the direction of the magnetic field, and connect the ultrasonic transmitter and ultrasonic receiver to the detector with a line. Step 5: Divide and orient the area of the concrete beam, and observe the ultrasonic detector data after orientation is completed. Step 6: Through ultrasonic data feedback, make real-time adjustments to areas that do not meet expectations, and change the magnetic field size by adjusting the current size so that the steel fibers are arranged in an orderly manner at a preset inclination angle in the concrete beam.

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