A square screen and a demagnetizer

Abstract

This invention provides a square screen and a demagnetizer. The square screen includes an outer perimeter, a sleeve coaxially disposed within the outer perimeter, and multiple magnetic strips symmetrically arranged along the horizontal center line H and the vertical center line M of the outer perimeter. The magnetic strips connect the outer perimeter and the sleeve. The multiple magnetic strips are connected in a forward and reverse interlocking manner in the Z direction to form square screen holes. This invention features strong magnetic conductivity, high structural strength, light weight, low impact resistance during vibration, and durability.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery negative electrode material processing technology, and in particular to a square screen and a demagnetizer. Background Technology

[0002] With the development of the new energy industry, the lithium battery industry is booming, and the demand for lithium battery anode materials is showing strong growth momentum, among which graphite is the main material. As the requirements for battery range continue to increase, the requirements for the purity of anode materials are also constantly increasing.

[0003] Magnetic impurities in the negative electrode material can increase the self-discharge of lithium-ion batteries, and in severe cases, cause short circuits. Therefore, improving the purity of the negative electrode material requires demagnetization. Demagnetization is generally performed using a demagnetizer equipped with a screen.

[0004] Existing demagnetizers use two types of screens: strip screens and corrugated screens. Strip screens use thick sheet metal as the base for the magnetic strips, which are milled using a bevel milling process. These strips are then arranged in parallel to form the screen. This type of screen consumes more raw materials, has a more difficult working surface to process, involves more steps in the machine setup, and has a longer production cycle.

[0005] The corrugated screen features a surrounding magnetic strip layout, with the magnetic strips pressed into a serrated shape and then wrapped around the outer perimeter in multiple layers. This screen structure is difficult to assemble; the magnetic strips, sleeve, and outer perimeter can only be spot-welded, and any deformation after welding cannot be corrected. This results in the screen being unable to withstand significant and prolonged impacts during vibration, causing the welds to easily break. Consequently, the magnetic strips detach from the sleeve and outer perimeter, leading to poor passage of negative electrode material and reduced production. Utility Model Content

[0006] The purpose of this invention is to provide a square screen and a demagnetizer that can achieve rapid, batch assembly and improve work efficiency.

[0007] The technical solution of this utility model is: a square screen, including an outer perimeter, a sleeve coaxially disposed within the outer perimeter, and a plurality of magnetic strips symmetrically arranged along the horizontal center line H and the vertical center line M of the outer perimeter; the magnetic strips connect the outer perimeter and the sleeve;

[0008] Multiple magnetic strips are connected in a forward and reverse interlocking manner in the Z direction to form a square sieve.

[0009] Preferably, the plurality of magnetic strips include a first magnetic element that coincides with the horizontal center line H and the vertical center line M; an eighth magnetic element, a second magnetic element, a sixth magnetic element, a fifth magnetic element, a fourth magnetic element, a third magnetic element, and a seventh magnetic element arranged sequentially from both ends of the first magnetic element in the X direction; and an eighth magnetic element, a second magnetic element, a sixth magnetic element, a fifth magnetic element, a ninth magnetic element, a tenth magnetic element, and a seventh magnetic element arranged sequentially from both ends of the first magnetic element in the Y direction.

[0010] The first and eighth magnetic focusing components are connected to the outer periphery and the sleeve at both ends, and the sixth, fifth, fourth, third, ninth and tenth magnetic focusing components are connected to the outer periphery at both ends.

[0011] Preferably, the thickness of the first and eighth magnetic focusing elements is greater than the thickness of the remaining magnetic focusing elements.

[0012] Preferably, each of the plurality of magnetic strips is provided with a slot for interlocking, the slot on the first magnetic element is through to the positive side in the Z direction, and the slot on the eighth magnetic element is through to the negative side in the Z direction.

[0013] Preferably, the height of the plurality of magnetic strips in the Z direction is lower than the height of the sleeve in the Z direction.

[0014] Preferably, the magnetic strip has a strip-shaped structure.

[0015] This utility model also provides a demagnetizer, including the aforementioned square screen.

[0016] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0017] I. The magnetic strip of this utility model is arranged symmetrically along the center. Without affecting the magnetic focusing effect, it leaves working space between the magnetic strip and the sleeve, which facilitates full welding, improves welding strength, and avoids the detachment of the magnetic strip due to vibration and inversion in the later stage.

[0018] Second, the magnetic strips of this utility model are interlocked in the horizontal and vertical directions to form an interlocking structure. Even without welding, the magnetic strips will not fall off, which can prevent the screen from falling apart after fatigue cracking of the weld points in the slotted direction, resulting in better structural stability.

[0019] Third, this utility model adopts square sieve holes, which can realize rapid and batch assembly and improve work efficiency;

[0020] Fourth, square screens can achieve strong magnetic conductivity and have the characteristics of high structural strength, light weight, low impact during vibration, and durability. Attached Figure Description

[0021] Figure 1A three-dimensional structural diagram of the square screen provided by this utility model;

[0022] Figure 2 A schematic diagram of the planar structure of the square screen provided by this utility model;

[0023] Figure 3 This is a schematic diagram of the magnetic strip structure.

[0024] In the attached diagram: 1. First magnetic focusing component; 2. Second magnetic focusing component; 3. Third magnetic focusing component; 4. Fourth magnetic focusing component; 5. Fifth magnetic focusing component; 6. Sixth magnetic focusing component; 7. Seventh magnetic focusing component; 8. Eighth magnetic focusing component; 9. Ninth magnetic focusing component; 10. Tenth magnetic focusing component; 11. Sleeve; 12. Peripheral area; 100. Magnetic focusing strip; 101. Groove. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0026] like Figure 1 , Figure 2 As shown, the square screen provided in this embodiment includes a sleeve 11 coaxially disposed within the periphery 12 and a plurality of magnetic strips 100 symmetrically arranged along the horizontal center line H and the vertical center line M of the periphery 12.

[0027] Both the outer periphery 12 and the sleeve 11 are circular and have a certain height in the Z direction. The magnetic strip 100 connects the outer periphery 12 and the sleeve 11. Figure 3 As shown, the magnetic strip 100 has a strip-shaped structure, and the raw material is selected from magnetically conductive materials of the same material, which are then cut and shaped. The magnetic strip 100 is batch-cut, batch-polished to remove burrs, and slotted 101 is cut, without the need for machining. The working surface of its magnetically conductive material can be used directly without complex milling, grinding, or other processing.

[0028] like Figure 2 , Figure 3As shown, the magnetic strip 100 includes a first magnetic element 1 that coincides with the horizontal center line H and the vertical center line M; an eighth magnetic element 8, a second magnetic element 2, a sixth magnetic element 6, a fifth magnetic element 5, a fourth magnetic element 4, a third magnetic element 3 and a seventh magnetic element 7 arranged sequentially from both ends of the first magnetic element 1 in the X direction; and an eighth magnetic element 8, a second magnetic element 2, a sixth magnetic element 6, a fifth magnetic element 5, a ninth magnetic element 9, a tenth magnetic element 10 and a seventh magnetic element 7 arranged sequentially from both ends of the first magnetic element 1 in the Y direction.

[0029] The thickness of the first magnetic focusing element 1 and the eighth magnetic focusing element 8 is greater than the thickness of the other magnetic focusing elements. The two ends of the first magnetic focusing element 1 and the eighth magnetic focusing element 8 are connected to the outer periphery 12 and the sleeve 11. This allows for full welding of the first magnetic focusing element 1, the eighth magnetic focusing element 8, and the sleeve 11, improving the overall load-bearing capacity of the screen, ensuring strength, and preventing breakage and torsion under vibration loads. The first magnetic focusing element 1, the eighth magnetic focusing element 8, and the sleeve 11 ensure both sufficient space for welding operations and that the magnetic conductivity is not weakened.

[0030] The two ends of the sixth magnetic gathering element 6, the fifth magnetic gathering element 5, the fourth magnetic gathering element 4, the third magnetic gathering element 3, the ninth magnetic gathering element 9, and the tenth magnetic gathering element 10 are connected to the outer periphery 12.

[0031] Each of the multiple magnetic strips 100 is provided with a slot 101 for interlocking. After interlocking, the external dimensions are compact and seamless, and the deformation during manufacturing is small. This ensures the continuity of the magnetic circuit in the channel and prevents dust from sticking during operation, thus extending the wear time and service life of the magnetic strips 100.

[0032] The slot 101 on the first magnetic gathering element 1 extends through to the positive side in the Z direction, and the slot 101 on the eighth magnetic gathering element 8 extends through to the negative side in the Z direction. This alternating installation design ensures both load-bearing strength and interlocks the magnetic strips 100 after installation in either direction, preventing them from detaching. The magnetic strips 100 can be magnetized on both sides, so the orientation is not important during use.

[0033] Multiple magnetic strips 100 are connected in a forward and reverse interlocking manner in the Z direction to form a square screen. Compared with the existing two screens, the overall weight of the square screen is reduced by 40%.

[0034] The spacing of the magnetic strips 100 was optimized through simulation and modeling. Because the number of magnetic strips 100 is doubled compared to the corrugated screen, the contact area of ​​the negative electrode material is increased by 20% compared to the corrugated screen, and the magnetic field strength is higher than that of the corrugated screen.

[0035] All the magnetic strips 100 are assembled on a dedicated tooling, allowing for one-time assembly and direct demolding. The resulting skeleton is then spot-welded to the outer 12 parts and fully welded to the sleeve 11. The intersections of the magnetic strips 100 are spot-welded using low-energy argon arc welding, which does not damage the material surface. Surface weld treatment is then performed. Finally, the inner hole of the sleeve 11 is machined.

[0036] This utility model also provides a demagnetizer including the above-mentioned square screen.

[0037] The square screen provided by this utility model can achieve the following technical effects:

[0038] (i) The distribution of the magnetic strips is scientific and reasonable, resulting in a concentrated and stable magnetic focusing effect;

[0039] (ii) The welding strength between the magnetic strip and the sleeve is high, and it can withstand repeated impacts during vibration without breaking;

[0040] (iii) The magnetic strips are interlocked and will not break or separate due to detachment from the solder;

[0041] (iv) Reduce the number of machining steps for magnetic strips and shorten the processing cycle;

[0042] (v) The single-piece finished products are easy to assemble and weld, and can realize the rapid production of matching tooling molds and ensure that the dimensions are qualified;

[0043] (vi) The deformation after welding is small, and each layer of screen relies on the sleeve for contact and support, resulting in an aesthetically pleasing appearance;

[0044] (vii) The weight of the screen is reduced by 40%, which can increase the number of screens in a single device, so that the total weight after installation on the demagnetizer is sufficient to prevent the demagnetizer's supporting components from bearing a heavy load under harsh working conditions such as maximum load and continuous operation.

[0045] (viii) Large batches can be assembled directly without the need for many auxiliary processes.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A square screen, comprising an outer perimeter (12) and a sleeve (11) coaxially disposed within the outer perimeter (12), characterized in that, It also includes a plurality of magnetic strips (100) symmetrically arranged along the horizontal center line H and the vertical center line M of the periphery (12); the magnetic strips (100) connect the periphery (12) and the sleeve (11); Multiple magnetic strips (100) are connected in a forward and reverse interlocking manner in the Z direction to form a square sieve.

2. The square screen of claim 1, wherein, The plurality of magnetic strips (100) include a first magnetic element (1) that coincides with the horizontal center line H and the vertical center line M, an eighth magnetic element (8), a second magnetic element (2), a sixth magnetic element (6), a fifth magnetic element (5), a fourth magnetic element (4), a third magnetic element (3) and a seventh magnetic element (7) arranged sequentially from both ends of the first magnetic element (1) in the X direction, and an eighth magnetic element (8), a second magnetic element (2), a sixth magnetic element (6), a fifth magnetic element (5), a ninth magnetic element (9), a tenth magnetic element (10) and a seventh magnetic element (7) arranged sequentially from both ends of the first magnetic element (1) in the Y direction; The first magnetic gathering element (1) and the eighth magnetic gathering element (8) are connected at both ends to the periphery (12) and the sleeve (11), and the sixth magnetic gathering element (6), the fifth magnetic gathering element (5), the fourth magnetic gathering element (4), the third magnetic gathering element (3), the ninth magnetic gathering element (9) and the tenth magnetic gathering element (10) are connected at both ends to the periphery (12).

3. The square screen of claim 2, wherein, The thickness of the first magnetic element (1) and the eighth magnetic element (8) is greater than the thickness of the remaining magnetic elements.

4. The square screen of claim 2, wherein, Each of the multiple magnetic strips (100) is provided with a slot (101) for mutual embedding. The slot (101) on the first magnetic element (1) is through to the positive side in the Z direction, and the slot (101) on the eighth magnetic element (8) is through to the negative side in the Z direction.

5. The square screen of claim 1, wherein, The height of the plurality of magnetic strips (100) in the Z direction is lower than the height of the sleeve (11) in the Z direction.

6. The square screen of claim 1, wherein, The magnetic strip (100) has a strip-shaped structure.

7. A de-gaussing machine characterized by, Including the square screen as described in any one of claims 1-6.

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