Steel fiber reinforced concrete pumping directional device based on electromagnetic principle

Abstract

The utility model relates to a kind of steel fiber concrete pumping directional device based on electromagnetic principle, and it is related to civil engineering construction equipment technical field, it includes the base pipe section for the directional conveying of concrete, further include electromagnetic coil unit installed on base pipe section, for the control unit for controlling electromagnetic coil unit to work, for the magnetic shielding protective shell for the protection of electromagnetic coil unit, and for the heat dissipation system for heat dissipation when electromagnetic coil unit works;Electromagnetic coil unit is coaxially wound on the outer wall of base pipe section and generates magnetic field along axial distribution in pipe after energization.The utility model has the effect of real-time carding steel fiber and actively orienting steel fiber in the concrete conveying process.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction equipment technology, and in particular to a steel fiber reinforced concrete pumping directional device based on electromagnetic principles. Background Technology

[0002] Currently, steel fiber reinforced concrete is increasingly widely used in tunnel segments, long-span bridges, industrial flooring, and military protection projects due to its superior crack resistance, impact resistance, fatigue resistance, and toughening properties.

[0003] In existing technologies, adding steel fibers to fresh concrete significantly increases the matrix yield stress and plastic viscosity. The randomly distributed steel fibers are prone to agglomeration, forming fiber clusters that can cause pump pipe blockage and localized concrete segregation. At the same time, the transverse scraping of the fibers against the pipe wall can drastically increase pumping resistance, increase equipment energy consumption, and exacerbate pump pipe wear. The reinforcing effect of steel fibers is anisotropic; under conventional processes, the fibers are three-dimensionally randomly distributed with an effective orientation coefficient of only 0.4 to 0.5. A large number of steel fibers cannot play a role in tensile strength, resulting in serious material waste. Furthermore, existing processes cannot actively control the fiber orientation, making it difficult to meet the design requirements of high-performance structures.

[0004] Regarding the aforementioned technologies, existing methods for improving steel fiber distribution are mostly passive controls. Fluid dynamic orientation depends on the shape of the mold or channel, is sensitive to flow velocity, and the fibers are easily reoriented due to turbulence. These methods cannot be applied to large-scale continuous pumping construction on site and are difficult to effectively intervene in the high-speed flowing slurry inside the pipeline. Utility Model Content

[0005] In order to comb and actively orient steel fibers in real time during concrete delivery, this utility model provides a steel fiber concrete pumping orienting device based on electromagnetic principles.

[0006] This utility model provides a steel fiber reinforced concrete pumping directional device based on electromagnetic principles, which adopts the following technical solution: A steel fiber reinforced concrete pumping directional device based on electromagnetic principles includes a base pipe section for directional conveying of concrete, an electromagnetic coil unit installed on the base pipe section, a control unit for controlling the operation of the electromagnetic coil unit, a magnetic shielding protective shell for protecting the electromagnetic coil unit, and a heat dissipation system for dissipating heat when the electromagnetic coil unit is in operation. The electromagnetic coil unit is coaxially wound around the outer wall of the base tube section and generates an axially distributed magnetic field inside the tube after being energized; the base tube section is made of any one of stainless steel, high-strength glass fiber reinforced plastic or wear-resistant ceramic composite tube. The electromagnetic coil unit and the magnetic shielding protective shell form a heat dissipation channel for the heat dissipation system. The heat dissipation system includes a heat dissipation fan for dissipating heat from the electromagnetic coil unit; the magnetic shielding protective shell has heat dissipation holes for the heat dissipation fan to blow air, and the heat dissipation holes are inclined so that the airflow enters the heat dissipation channel in a spiral shape.

[0007] By employing the above technical solution, the axial magnetic field generated by the energized electromagnetic coil unit is used to magnetize the ferromagnetic steel fibers within the high-speed flowing steel fiber reinforced concrete during pumping. The magnetic field torque drives the steel fibers to align along the pipe axis, achieving dynamic online steel fiber combing and orientation. Simultaneously, the non-magnetic material ensures that the magnetic field generated by the external electromagnetic coil unit penetrates the pipe wall with no or low loss, acting on the steel fiber reinforced concrete slurry inside the pipe, thus ensuring the effective orientation of the steel fibers.

[0008] Furthermore, the heat generated by the electromagnetic coil unit during operation can be quickly dissipated through the heat dissipation channel, and the cooling fan provides forced air cooling power. The inclined heat dissipation holes cause the airflow to enter the heat dissipation channel in a spiral shape, increasing the contact area and contact time between the airflow and the electromagnetic coil unit, thereby improving the uniformity and efficiency of heat dissipation.

[0009] Optionally, the control unit includes a DC power supply module and a current regulation module for rectifying and transforming AC power into adjustable DC power. The control unit is connected to the electromagnetic coil unit for adjusting the excitation current within a specified current range to change the magnetic field strength.

[0010] By adopting the above technical solution, the DC power supply module provides a stable DC power supply to the electromagnetic coil unit, ensuring the stability of the magnetic field. At the same time, the current regulation module can flexibly adjust the excitation current to achieve precise control of the magnetic field strength, which can adapt to construction conditions with different steel fiber content. Furthermore, the control unit can be connected to the conventional AC power on the construction site.

[0011] Optionally, a protective component for protecting the heat dissipation holes is installed on the base tube segment; The protective assembly includes a protective shell mounted on the base pipe section, a protective mesh plate detachably mounted on the protective shell for preventing the heat dissipation holes from being blocked, and a locking structure for locking the protective mesh plate to the protective shell. An air inlet is provided on the protective shell, and the cooling fan is installed on the protective shell and blows air through the air inlet; an inclined air guide plate is installed axially inside the protective shell, and the air guide plate is used to disperse the blown air.

[0012] By adopting the above technical solutions, the protective mesh can effectively filter dust, sand and other debris at the construction site, preventing them from entering the heat dissipation channel and blocking the heat dissipation holes, thus ensuring the normal operation of the heat dissipation system. At the same time, the air guide plate disperses the airflow blown in by the heat dissipation fan, so that the airflow flows evenly to the heat dissipation holes, preventing uneven heat dissipation caused by excessive or insufficient local airflow.

[0013] Optionally, the locking structure includes a locking ring slidably installed inside the protective housing, a compression spring connected between the locking ring and the protective mesh plate, and a locking rod installed on the protective housing for locking the locking ring to the protective housing; The compression spring drives the protective mesh plate to always tend to move away from the locking ring.

[0014] By adopting the above technical solution, the elastic force of the compression spring can cause the protective mesh to shake slightly when impacted by debris, thereby achieving the effect of shaking off impurities, reducing the probability of blockage of the protective mesh, and eliminating the need for frequent manual cleaning. At the same time, the locking rod can quickly lock and unlock the locking ring and the protective shell, thus enabling the detachable installation of the protective mesh.

[0015] Optionally, a mica insulating tape is installed on the outside of the base tube section, and the electromagnetic coil unit is installed on the mica insulating tape for heat protection of the electromagnetic coil unit.

[0016] By adopting the above technical solution, the mica insulating tape has excellent high temperature resistance and electrical insulation properties. On the one hand, it can achieve electrical isolation between the electromagnetic coil unit and the base pipe section. On the other hand, it can withstand the heat generated by the electromagnetic coil unit when it is working, preventing the heat from being directly transferred to the base pipe section and affecting the state of the concrete slurry. At the same time, it forms heat-resistant protection for the electromagnetic coil unit and extends the service life of the coil.

[0017] Optionally, the magnetic shielding protective shell is installed on the base tube section, and the magnetic shielding protective shell is made of magnetically conductive material to reduce magnetic leakage and protect the electromagnetic coil unit.

[0018] By adopting the above technical solutions, the magnetic shielding protective shell made of magnetic conductive material can effectively constrain the magnetic field range and reduce the leakage of the magnetic field outward. At the same time, the magnetic shielding protective shell can form a closed magnetic circuit, enhance the magnetic induction intensity inside the base tube section, improve the orientation effect of steel fibers, and also provide physical protection for the electromagnetic coil unit to prevent the coil from being damaged by bumps and impacts at the construction site.

[0019] Optionally, the two ends of the base pipe section are equipped with flange interfaces for connection with conventional concrete delivery pump pipes.

[0020] By adopting the above technical solution, the flange interface can achieve a quick and secure connection between the base pipe section and the existing concrete conveying pump pipe, and the device can be directly connected in series in the pumping pipeline.

[0021] Optionally, the electromagnetic coil unit is composed of insulated copper wire windings to generate an axially distributed magnetic field inside the tube after energization.

[0022] By adopting the above technical solution, the insulated copper wire has excellent conductivity and insulation properties. It can stably generate a magnetic field after being energized. The multi-layer winding structure can enhance the magnetic field strength and ensure that the axial magnetic field generated inside the pipe is evenly distributed. This allows the steel fiber to be subjected to uniform magnetic torque at all positions inside the pipe, improving the consistency of orientation.

[0023] In summary, this utility model has at least one of the following beneficial technical effects: 1. By utilizing the axial magnetic field generated by the energized electromagnetic coil unit, the ferromagnetic steel fibers in the high-speed flowing steel fiber concrete during pumping are magnetized. The magnetic field torque drives the steel fibers to align along the pipeline axis, realizing dynamic online steel fiber combing and orientation. 2. The protective mesh can effectively filter dust, sand and other debris at the construction site, preventing them from entering the heat dissipation channel and clogging the heat dissipation holes, thus ensuring the normal operation of the heat dissipation system. At the same time, the air guide plate disperses the airflow blown in by the cooling fan, so that the airflow flows evenly to the heat dissipation holes, preventing uneven heat dissipation caused by excessive or insufficient local airflow. 3. The elastic force of the compression spring can cause the protective mesh to shake slightly when impacted by debris, achieving the effect of shaking off impurities and reducing the probability of clogging of the protective mesh, eliminating the need for frequent manual cleaning. At the same time, the locking rod can quickly lock and unlock the locking ring and the protective shell, thereby enabling the detachable installation of the protective mesh. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a steel fiber reinforced concrete pumping directional device based on electromagnetic principles. Figure 2 This is a cross-sectional view of a steel fiber reinforced concrete pumping directional device based on electromagnetic principles. Figure 3 yes Figure 2 A magnified view of part A in the middle.

[0025] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Base pipe section; 2. Electromagnetic coil unit; 3. Control unit; 4. Magnetic shielding protective shell; 5. Heat dissipation system; 6. Mica insulating tape; 7. Heat dissipation channel; 8. Heat dissipation fan; 9. Heat dissipation hole; 10. Air outlet; 11. Protective component; 12. Protective shell; 13. Protective mesh plate; 14. Locking structure; 15. Locking ring; 16. Compression spring; 17. Locking rod; 18. Arc-shaped pull plate; 19. Plug-in rod; 20. Air inlet; 21. Air guide plate; 22. Slide groove; 23. Mounting groove; 24. Flange interface. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] This utility model discloses a steel fiber reinforced concrete pumping directional device based on electromagnetic principles.

[0028] Reference Figure 1 as well as Figure 2 A steel fiber reinforced concrete pumping directional device based on electromagnetic principles includes a base pipe section 1, an electromagnetic coil unit 2, a control unit 3, a magnetic shielding protective shell 4, and a heat dissipation system 5.

[0029] The control unit 3 is electrically connected to the electromagnetic coil unit 2. The electromagnetic coil unit 2 is coaxially mounted on the outer wall of the base tube section 1 and is used to generate an axially distributed magnetic field when the control unit 3 is operating, thereby facilitating current regulation and magnetic field control. A magnetic shielding protective shell 4 is mounted on the base tube section 1 and is used to protect the electromagnetic coil unit 2. A heat dissipation system 5 is disposed between the electromagnetic coil unit 2 and the magnetic shielding protective shell 4 and is used to dissipate heat when the electromagnetic coil unit 2 is operating.

[0030] The base pipe section 1 provides a flow channel for concrete slurry. In this embodiment, the base pipe section 1 is made of 304 stainless steel seamless steel pipe, which has excellent non-magnetic properties. Its inner diameter is designed to be 125mm, which is consistent with the diameter of commonly used concrete conveying pump pipes. The length of the base pipe section 1 is set to 1.5m. Both ends are welded with standard DN125 high-pressure flange interfaces 24, which can be directly connected in series in the existing pumping pipeline, thereby facilitating the delivery of concrete through the pumping pipeline via the base pipe section 1.

[0031] A layer of high-temperature resistant mica insulating tape 6 is fixedly wound around the outer wall of the base tube section 1. The electromagnetic coil unit 2 is fixedly installed on the mica insulating tape 6, thereby achieving electrical isolation and heat protection for the electromagnetic coil unit 2 through the mica insulating tape 6. At the same time, the electromagnetic coil unit 2 uses 2.5mm diameter polyesterimide enameled flat copper wire, which is uniformly distributed along the axial direction of the base tube section 1 in a multi-layer dense winding manner to form a solenoid structure. Thus, after the control unit 3 controls the electromagnetic coil unit 2 to be energized, a stable and uniform axial magnetic field can be generated within the base tube section 1.

[0032] The magnetic shielding protective shell 4 is a cylindrical structure made of industrial soft iron. The magnetic shielding protective shell 4 is fixedly installed on the base tube section 1 and sleeved around the electromagnetic coil unit 2, which can not only reduce the leakage of magnetic field, but also enhance the magnetic induction intensity inside the base tube section 1.

[0033] Reference Figure 1 as well as Figure 2 The electromagnetic coil unit 2 and the magnetic shielding protective shell 4 form a heat dissipation channel 7 for the heat dissipation system 5. The heat dissipation system 5 includes a cooling fan 8 for dissipating heat when the control unit 3 energizes the electromagnetic coil unit 2. Simultaneously, the magnetic shielding protective shell 4 has a heat dissipation hole 9 at one end and an air outlet 10 at the other end, allowing the cooling fan 8 to deliver air through the heat dissipation hole 9 into the heat dissipation channel 7. The air then cools the heat generated by the electromagnetic coil unit 2 during operation, and the hot air is discharged through the air outlet 10 to achieve forced air cooling of the electromagnetic coil unit 2. The heat dissipation hole 9 is angled to allow airflow to enter the heat dissipation channel 7 in a spiral shape, increasing the heat dissipation area and improving the uniformity of heat dissipation. A dustproof mesh plate is fixed to the outside of the air outlet 10 with screws to protect it.

[0034] Reference Figure 2 as well as Figure 3 A protective assembly 11 for protecting the heat dissipation holes 9 is installed on the base pipe section 1. The protective assembly 11 includes a protective shell 12, a protective mesh plate 13, and a locking structure 14. The locking structure 14 includes a locking ring 15, a compression spring 16, and a locking rod 17. The locking rod 17 includes an arc-shaped pull plate 18 and a plug-in rod 19.

[0035] The protective shell 12 is fixedly installed together with the magnetic shielding protective shell 4 by the first locking bolt. The protective mesh plate 13 is fixedly installed together with the protective shell 12 by the locking structure 14.

[0036] An air inlet 20 is provided on the protective shell 12. The cooling fan 8 is fixedly installed on the protective shell 12 and supplies air into the cooling channel 7 through the air inlet 20. Multiple inclined air guide plates 21 are axially fixedly installed inside the protective shell 12. When the cooling fan 8 supplies air, the air guide plates 21 disperse the airflow, allowing it to evenly enter the cooling channel 7 through the cooling holes 9. A sliding groove 22 is provided inside the protective shell 12, and a locking ring 15 is slidably connected in the sliding groove 22. One end of a compression spring 16 is fixedly connected to the locking ring 15, and the other end is fixedly connected to the protective mesh plate 13. The compression spring 16 drives the protective mesh plate 13 to always tend to move away from the locking ring 15. An installation groove 23 is provided on the protective shell 12, and an arc-shaped pull plate 18 is installed in the installation groove 23 and fixed by a second locking bolt. The plug rod 19 is fixedly installed on the side of the arc-shaped pull plate 18 near the mounting groove 23. The plug rod 19 passes through the protective shell 12 and is inserted into the locking ring 15, thereby locking the locking ring 15 and the protective shell 12.

[0037] Reference Figure 1 as well as Figure 2 Control unit 3 is an independent DC power supply cabinet, connected to the 380V AC power supply on site. Control unit 3 includes a control cabinet panel, a DC power supply module, and a current regulation module to rectify and transform the AC power into adjustable DC power. The control cabinet panel is equipped with a current adjustment knob and a digital display screen. The operator can adjust the excitation current within the range of 0 to 60A. Control unit 3 also has a current conversion regulation function, which can adjust the current intensity in real time according to the feedback signal from the pump pressure sensor.

[0038] This device is typically installed at the end of the concrete pumping pipeline, before the pouring hose. The construction operation procedure is as follows: Before construction begins, connect the base pipe section 1 to the pumping pipeline and perform routine pumping and lubrication operations. When the steel fiber-containing concrete slurry flows stably, turn on the power to the control unit 3 and adjust the excitation current to generate an axial strong magnetic field of approximately 0.2T within the base pipe section 1. When the concrete slurry flows through the device, the steel fibers are magnetized to form miniature magnetic dipoles. Under the action of magnetic torque, these dipoles overcome the resistance of the slurry and rotate, adjusting their long axis to a flow-in attitude parallel to the pipeline axis, achieving directional alignment. After construction is completed, first turn off the excitation power, then clean the pipeline with water according to the standard procedure; no disassembly of the device is required for maintenance.

[0039] The implementation principle of the steel fiber reinforced concrete pumping directional device based on electromagnetic principle in this embodiment of the utility model is as follows: using the principle of electromagnetic induction, the control unit 3 supplies power to the electromagnetic coil unit 2 wound on the outer wall of the non-magnetic matrix pipe section 1, so that a high-intensity axial magnetic field is generated in the matrix pipe section 1. When the steel fiber reinforced concrete slurry flows through the magnetic field area, the ferromagnetic steel fibers are magnetized into miniature magnetic dipoles, which rotate and deflect under the action of the magnetic field torque until their long axis is aligned with the direction of the magnetic field lines (pipe axis), thus realizing the directional arrangement of the steel fibers.

[0040] Simultaneously, the magnetic shielding protective shell 4 reduces magnetic leakage and enhances the magnetic field within the substrate pipe section 1. At the same time, the cooling fan 8 is activated to deliver air to the cooling channel 7, thereby dissipating the working heat of the electromagnetic coil unit 2 and expelling the hot air through the air outlet 10, thus ensuring stable operation of the device. Furthermore, the oriented steel fibers reduce friction and agglomeration during pumping, lowering pumping friction and preventing pipe blockage. They also maintain their oriented state after entering the formwork, significantly improving the mechanical properties of the concrete components. The modular design of the device adapts to existing pumping equipment, enabling dynamic online orientation during steel fiber reinforced concrete pumping construction.

[0041] Meanwhile, during air delivery, the protective mesh plate 13 in the protective shell 12 can filter impurities to prevent them from clogging the heat dissipation holes 9. When there are impurities in the incoming air, the air and impurities impact the protective mesh plate 13, causing it to overcome the elastic force of the compression spring 16 and move towards the locking ring 15, thereby blocking the impurities in the air. When the cooling fan 8 stops working, the elastic force of the compression spring 16 drives the protective mesh plate 13 to reset, thereby shaking off the impurities on the protective mesh plate 13 during the reset.

[0042] When the protective mesh plate 13 needs to be replaced after a long period of use, firstly, the protective shell 12 is removed from the magnetic shielding protective shell 4 by turning the first locking bolt. Then, the arc-shaped pull plate 18 and the mounting groove 23 are no longer fixed by turning the second locking bolt. Then, the arc-shaped pull plate 18 is pulled upward to drive the plug rod 19 to move upward, so that the plug rod 19 is disengaged from the locking ring 15. Thus, the locking ring 15 and the protective shell 12 are no longer fixed, making it easy to pull the locking ring 15, the compression spring 16 and the protective mesh plate 13 out of the protective shell 12, and thus making it easy to replace the protective mesh plate 13.

[0043] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A steel fiber reinforced concrete pumping directional device based on electromagnetic principles, comprising a base pipe section (1) for directional conveying of concrete, characterized in that, It also includes an electromagnetic coil unit (2) installed on the base tube section (1), a control unit (3) for controlling the operation of the electromagnetic coil unit (2), a magnetic shielding protective shell (4) for protecting the electromagnetic coil unit (2), and a heat dissipation system (5) for dissipating heat when the electromagnetic coil unit (2) is working. The electromagnetic coil unit (2) is coaxially wound around the outer wall of the base tube section (1) and generates an axially distributed magnetic field inside the tube after being energized; the base tube section (1) is made of any one of stainless steel, high-strength glass fiber reinforced plastic or wear-resistant ceramic composite tube. The electromagnetic coil unit (2) and the magnetic shielding protective shell (4) form a heat dissipation channel (7) for the heat dissipation system (5) to dissipate heat. The heat dissipation system (5) includes a heat dissipation fan (8) for dissipating heat from the electromagnetic coil unit (2); the magnetic shielding protective shell (4) is provided with heat dissipation holes (9) for the heat dissipation fan (8) to blow air, and the heat dissipation holes (9) are inclined so that the airflow enters the heat dissipation channel (7) in a spiral shape.

2. The steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 1, characterized in that: The control unit (3) includes a DC power supply module and a current regulation module for rectifying and transforming AC power into adjustable DC power. The control unit (3) is connected to the electromagnetic coil unit (2) for adjusting the excitation current within a specified current range to change the magnetic field strength.

3. The steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 1, characterized in that: The base tube section (1) is equipped with a protective component (11) for protecting the heat dissipation hole (9). The protective assembly (11) includes a protective shell (12) mounted on the base pipe section (1), a protective mesh plate (13) detachably mounted on the protective shell (12) for preventing the heat dissipation holes (9) from being blocked, and a locking structure (14) for locking the protective mesh plate (13) and the protective shell (12). An air inlet (20) is provided on the protective shell (12), and the cooling fan (8) is installed on the protective shell (12) and blows air through the air inlet (20); an inclined air guide plate (21) is installed axially inside the protective shell (12), and the air guide plate (21) is used to disperse the blown air.

4. The steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 3, characterized in that: The locking structure (14) includes a locking ring (15) slidably mounted in the protective shell (12), a compression spring (16) connected between the locking ring (15) and the protective mesh plate (13), and a locking rod (17) mounted on the protective shell (12) for locking the locking ring (15) to the protective shell (12). The compression spring (16) drives the protective mesh plate (13) to always tend to move away from the locking ring (15).

5. A steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 1, characterized in that: A mica insulating tape (6) is installed on the outside of the base tube section (1), and the electromagnetic coil unit (2) is installed on the mica insulating tape (6) for heat protection of the electromagnetic coil unit (2).

6. The steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 1, characterized in that: The magnetic shielding protective shell (4) is installed on the base tube section (1). The magnetic shielding protective shell (4) is made of magnetically conductive material to reduce magnetic leakage and protect the electromagnetic coil unit (2).

7. A steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 1, characterized in that: The two ends of the base pipe section (1) are equipped with flange interfaces (24) for connection with conventional concrete delivery pump pipes.

8. A steel fiber reinforced concrete pumping directional device based on electromagnetic principles according to claim 1, characterized in that: The electromagnetic coil unit (2) is composed of insulated copper wire windings to generate an axially distributed magnetic field inside the tube after energization.

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