Novel degaussing electromagnet
By designing a new demagnetization electromagnet with a multi-layer coil structure and current control system, the problem of residual magnetism after the electromagnet is solved, online demagnetization and rapid removal of iron powder and iron filings are achieved, and production efficiency and quality are improved.
Patent Information
- Application Number
- CN202422156442.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-04
AI Technical Summary
The existing electromagnets cause residual magnetism to remain on the surface of the steel after handling the steel, affecting downstream processes such as welding and mechanical processing, and it is difficult to remove magnetic powder.
A new demagnetization electromagnet is designed, using a multi-layer coil structure and current control system, and the residual magnetism is removed online through the reverse demagnetization principle, and the electrician pure iron material and the alternating front and reverse weakening of the DC power supply mode for demagnetization.
On the premise of ensuring production efficiency, the residual magnetism on the steel surface is effectively removed, the impact of downstream processes is solved, and the iron powder and iron filings are quickly removed, improving production quality and efficiency.
Smart Images
Figure CN223065943U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnets, and particularly relates to a novel degaussing electromagnet. Background Technique
[0002] At present, the vast majority of customers use electromagnets to handle steel. Electromagnets have the advantages of high efficiency, no damage to steel, low manual labor intensity, and high safety when handling steel. However, after the steel is handled by the electromagnet, the steel will inevitably be magnetized by the electromagnet, and thus there will be some residual magnetism on the surface. When the residual magnetism is too large, it will have the following effects on the downstream processes: arc blowout occurs during welding, the welding position deviates, and the welding difficulty increases; during machining, it will affect the tool (such as sticking to the tool), affecting the service life of the tool; the steel with residual magnetism is also prone to adsorb impurities such as iron filings and magnetic powder, affecting the quality of the steel, and bringing difficulties to the subsequent removal of magnetic powder, etc.
[0003] In view of the above problems, there are two solutions. One is to add a degaussing system before the downstream production end; the other is to degauss the steel by high-temperature heating; however, both of these solutions are not applicable to the manufacturer. Content of the Utility Model
[0004] In view of the above technical problems in the related art, the utility model provides a novel degaussing electromagnet, which can solve the above problems.
[0005] In order to achieve the above technical purpose, the technical solution of the utility model is realized as follows:
[0006] A novel degaussing electromagnet includes a coil assembly. There is a top plate above the coil assembly, and a side plate covers the side of the coil assembly. There is an installation plate on the top plate with the same outer diameter as the top plate. One side of the installation plate is grooved, and a wire outlet box is installed in the groove. A number of installation holes are opened outside the groove on the installation plate; the coil assembly includes an iron core, the iron core is in an I shape, and a secondary coil is wound around the I-shaped cavity; outside the secondary coil, a No. 1 main coil, a No. 2 main coil, and a No. 3 main coil are wound in sequence from the inside to the outside.
[0007] Further, an internal thickening plate is provided above the I-shaped iron core, and a magnetic pole is provided below the iron core.
[0008] Further, the No. 1 main coil, the No. 2 main coil, and the No. 3 main coil are connected in parallel and in sequence; the S ends of the No. 1 main coil, the No. 2 main coil, the No. 3 main coil, and the E end of the secondary coil in the coil assembly are connected to form a common wire; the E ends of the No. 1 main coil, the No. 2 main coil, and the No. 3 main coil are connected to form a main lead; the S end of the lead-out wire of the secondary coil is separately led out to form a secondary lead; when the main coil is energized, the common wire and the main lead are connected; when the secondary coil is energized, the common wire and the secondary lead are connected.
[0009] Further, the electromagnetic wires used in the three coils of the 1# main coil, 2# main coil, and 3# main coil have the same specification and the same total turn length; the secondary coil is a spare coil and uses electromagnetic wires with a smaller specification level.
[0010] Further, the top plate, the side plate, and the iron core are all made of electrically pure iron.
[0011] Further, a current control system is provided outside the degaussing electromagnet. When the electromagnet lifts an object, the electronic control system supplies direct current power, and reverse degaussing is performed on the main coil. At this time, the degaussing electromagnet has a large number of reverse degaussing times and a small current attenuation amplitude each time; when the electromagnet sucks and lifts bulk materials and shredded materials, the electronic control system performs reverse degaussing on the secondary coil, and the number of reverse degaussing times is 1 time.
[0012] Further, the additional degaussing function of the degaussing electromagnet uses a positive and negative alternating weakening direct current power supply mode for degaussing, and the power supply time each time does not exceed 15 seconds.
[0013] Beneficial effects:
[0014] In this application, the residual magnetism on the surface of magnetized steel is removed through the principle of reverse degaussing, the excitation and demagnetization speeds of the electromagnet are increased through the principle of reducing the coil inductance, and the degaussing effect is better by selecting electrically pure iron as the magnetic system material. When handling steel, on the premise of ensuring normal production efficiency, the residual magnetism can be eliminated online, and the influence of the residual magnetism of the steel on downstream processes (such as welding, machining, magnetic powder cleaning, etc.) can be solved. When sucking and lifting shredded materials and bulk materials, the iron powder and iron filings remaining on the surface can also be quickly removed. Brief description of the drawings
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0016] The following further details the present invention according to the drawings.
[0017] Figure 1 It is a schematic diagram of the internal structure of a new type of degaussing electromagnet of the present invention;
[0018] Figure 2 It is a three-dimensional structure schematic diagram of a new type of degaussing electromagnet of the present invention;
[0019] Figure 3 It is a top view of the coil assembly of a new type of degaussing electromagnet of the present invention;
[0020] Figure 4 Schematic cross-sectional view of the coil assembly of a novel degaussing electromagnet of the present utility model;
[0021] Figure 5 Schematic diagram of the coil connection of the coil assembly of a novel degaussing electromagnet of the present utility model;
[0022] Figure 6 Schematic diagram of the process of forward and reverse energization of a novel degaussing electromagnet of the present utility model and the reduction of current oscillation amplitude;
[0023] In the figure: 1. Coil assembly; 1-1. Iron core; 1-2. 1# secondary coil; 1-3. 1# primary coil; 1-4. 2# primary coil; 1-5. 3# primary coil; 2. Top plate; 3. Enclosure; 4. Mounting plate; 5. Outlet box;
[0024] Figure 5 Among them: S represents the lead wire inside the coil; E represents the lead wire outside the coil. Specific implementation manner
[0025] In order to enable those skilled in the art of the present technology to better understand the technical solution of the present utility model, the technical solution of a novel degaussing electromagnet of the present utility model will be further described below in conjunction with the specification drawings and through specific implementation manners.
[0026] As Figure 1 and Figure 2 shown, a novel degaussing electromagnet includes a coil assembly 1. A top plate 2 is provided above the coil assembly 1, and an enclosure 3 covers the side of the coil assembly 1. A mounting plate 4 with the same outer diameter as the top plate 2 is arranged on the top plate 2. A groove is opened on one side of the mounting plate 4, and an outlet box 5 is installed in the groove. A number of mounting holes are opened outside the groove on the mounting plate 4.
[0027] As Figure 3 and Figure 4 shown, the coil assembly 1 includes an iron core 1-1. The iron core 1-1 is in an I-shaped form, and the secondary coil 1-2 is wound around the I-shaped cavity; the 1# primary coil 1-3, 2# primary coil 1-4, and 3# primary coil 1-5 are wound around the outside of the secondary coil 1-2 in sequence from the inside to the outside. Compared with the single primary coil mode of the conventional electromagnet, three primary coils are provided in the present invention. This primary coil mode can greatly reduce the inductance of the coil. Through theoretical calculation and experimental data measurement, the inductance can be reduced by more than 1 time, thereby greatly accelerating the excitation and demagnetization time of the electromagnet and improving the degaussing rate.
[0028] The above-mentioned built-in thickened plate is above the I-shaped iron core 1-1, and the magnetic pole is below the iron core 1-1. The built-in thickened plate can reduce magnetic leakage and make the magnetic circuit smoother; the magnetic pole below the I-shaped iron core can increase the adsorption area and also increase the magnetic penetration depth of the electromagnet.
[0029] As Figure 5 shown, the 1# main coil 1-3, 2# main coil 1-4, and 3# main coil 1-5 are connected in parallel with each other and connected in sequence; the S terminals of the 1# main coil 1-3, 2# main coil 1-4, and 3# main coil 1-5, and the E terminal of the secondary coil 1-2 inside the coil assembly 1 are connected to form a common line; the E terminals of the 1# main coil 1-3, 2# main coil 1-3, and 3# main coil 1-4 are connected to form a main lead; the S terminal of the lead-out wire of the secondary coil 1-2 is led out separately to form a secondary lead; when the main coil is energized, the common line and the main lead are connected, and when the secondary coil is energized, the common line and the secondary lead are connected.
[0030] The electromagnetic wire specifications of the above-mentioned 1# main coil 1-3, 2# main coil 1-4, and 3# main coil 1-5 are the same, and the total turn length is the same; the secondary coil 1-2 is a spare coil and uses an electromagnetic wire with a smaller specification grade. The magnetic flux generated by energizing the secondary coil is about 1 / 4 of the total magnetic flux of the main coil.
[0031] The above-mentioned top plate 2, side plate 3, and iron core 1-1 are all made of electrically pure iron. Using this material for the magnetic circuit has the advantages of low coercive force, high magnetic permeability, high saturation magnetic induction, stable magnetism, and no magnetic aging.
[0032] The above-mentioned degaussing electromagnet is externally provided with a current control system. The current control system adopts the principle of DC commutation decay degaussing, and its relationship curve between current and time is as Figure 6 shown. When the electromagnet lifts an object, the electronic control system supplies DC power to demagnetize the main coil reversely. At this time, the degaussing electromagnet has many commutation demagnetization times and a small current decay amplitude each time; when the electromagnet sucks up bulk materials and scraps, the main coil is used for sucking materials, and the electronic control system demagnetizes the secondary coil reversely, and the number of reverse demagnetization times is 1 time.
[0033] The additional degaussing function of the above-mentioned degaussing electromagnet uses a positive and negative alternating weakening DC power supply mode for degaussing, and the power supply time each time does not exceed 15 seconds to achieve the state of simulated AC degaussing. The current control system requires a large adjustment range and can adjust the output of the electronic control according to the inductance and DC resistance of the electromagnet. If multiple electromagnets are used in combination, its control system adopts a one-to-one control mode to ensure the control accuracy.
[0034] Next, the technical solutions and technical effects of the present invention will be further described in conjunction with specific embodiments.
[0035] When the novel degaussing electromagnet described in the utility model is specifically used, steel is placed in an alternating magnetic field, and a hysteresis loop is generated in the steel. When the amplitude of the alternating magnetic field gradually decreases, the trajectory of the hysteresis loop also becomes smaller and smaller. When the magnetic field strength drops to zero, the residual magnetism Br remaining in the workpiece approaches zero. During demagnetization, the changes in the direction and magnitude of the current and the magnetic field must be carried out simultaneously with commutation attenuation. DC commutation attenuation demagnetization means that by continuously changing the direction of direct current (including three-phase full-wave rectified current), and at the same time reducing the current passing through the steel to zero, so as to carry out demagnetization. The number of times of current attenuation during the demagnetization process should be as many as possible (generally required to be more than 30 times), and the current amplitude of each attenuation should be as small as possible. If the attenuation amplitude is too large, the demagnetization effect cannot achieve the expected purpose.
[0036] In summary, the utility model can achieve on-line demagnetization of the electromagnet. When handling steel, on the premise of ensuring normal production efficiency, it can greatly solve the influence of the residual magnetism of steel on downstream processes (such as welding, machining, magnetic powder cleaning, etc.). When lifting scraps and bulk materials, it can quickly clean the iron powder and iron filings remaining on the surface, so as to meet the usage requirements of customers.
[0037] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and are not intended to limit the utility model. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art shall be included within the protection scope of the present invention.
Claims
1. A new type of degaussing electromagnet, characterized in that, It includes a coil assembly (1). Above the coil assembly (1), there is a top plate (2). The side of the coil assembly (1) is covered with a surrounding plate (3). On the top plate (2), there is an installation plate (4) with the same outer diameter as the top plate (2). One side of the installation plate (4) is grooved, and a wire outlet box (5) is installed in the groove. A number of installation holes are provided outside the groove on the installation plate (4). The coil assembly (1) includes an iron core (1-1). The iron core (1-1) is in an I shape, and a secondary coil (1-2) is wound around the I-shaped cavity. Outside the secondary coil (1-2), a No. 1 main coil (1-3), a No. 2 main coil (1-4), and a No. 3 main coil (1-5) are wound in sequence from inside to outside.
2. A novel degaussing electromagnet according to claim 1, characterized in that, Above the iron core (1-1) is an in-built thickened plate, and below the iron core (1-1) are magnetic poles.
3. A novel degaussing electromagnet according to claim 1, characterized in that, The No. 1 main coil (1-3), the No. 2 main coil (1-4), and the No. 3 main coil (1-5) are connected in parallel with each other in sequence. The S terminals of the No. 1 main coil (1-3), the No. 2 main coil (1-4), and the No. 3 main coil (1-5) in the coil assembly (1), and the E terminal of the secondary coil (1-2) are connected to form a common wire. The E terminals of the No. 1 main coil (1-3), the No. 2 main coil (1-3), and the No. 3 main coil (1-4) are connected to form a main lead wire. The lead wire S terminal of the secondary coil (1-2) is led out separately to form a secondary lead wire. When the main coil is energized, the common wire and the main lead wire are connected. When the secondary coil is energized, the common wire and the secondary lead wire are connected.
4. A novel degaussing electromagnet according to claim 1, characterized in that, The electromagnetic wire specifications of the three coils of the No. 1 main coil (1-3), the No. 2 main coil (1-4), and the No. 3 main coil (1-5) are the same, and the total turn lengths are the same. The secondary coil (1-2) is a spare coil and uses an electromagnetic wire with a smaller specification grade.
5. A novel degaussing electromagnet according to claim 1, characterized in that, The materials of the top plate (2), the surrounding plate (3), and the iron core (1-1) are all electrolytic iron.
6. A novel degaussing electromagnet according to claim 1, characterized in that, The degaussing electromagnet is externally provided with a current control system. When the electromagnet lifts an object, the electronic control system supplies direct current power to demagnetize the main coil in the reverse direction. At this time, the degaussing electromagnet has a large number of reverse demagnetization times and a small current attenuation amplitude each time. When the electromagnet sucks and lifts bulk materials and crushed materials, the electronic control system demagnetizes the secondary coil in the reverse direction, and the number of reverse demagnetization times is 1 time.
7. A novel degaussing electromagnet according to claim 6, characterized in that, The additional demagnetization function of the degaussing electromagnet uses a positive and negative alternating weakening direct current power supply mode for demagnetization, and each power supply time does not exceed 15 seconds.