Degaussing structure for electric vibration table and electric vibration table

Abstract

The utility model provides a degaussing structure for an electrodynamic vibration table and the electrodynamic vibration table, the electrodynamic vibration table comprises a moving coil assembly and a magnetic circuit assembly which are arranged up and down, an upper cover assembly is arranged above the magnetic circuit assembly, and a moving coil in the moving coil assembly can extend out of the upper cover assembly to do reciprocating motion. The degaussing structure comprises an outer side upper degaussing plate, an outer side lower degaussing plate, an inner side upper degaussing plate and an inner side lower degaussing plate, the outer side upper degaussing plate is arranged on the upper surface of a top cover plate of the upper cover assembly, and the outer side lower degaussing plate is arranged on the lower surface of the top cover plate of the upper cover assembly; the magnetic field directions of the outer side upper degaussing plate and the outer side lower degaussing plate are upward, the inner side upper degaussing plate is arranged on the upper surface of an output end plate of the moving coil assembly, the inner side lower degaussing plate is arranged on the lower surface of the output end plate of the moving coil assembly, and the magnetic field directions of the inner side upper degaussing plate and the inner side lower degaussing plate are downward; according to the structure, the double-layer degaussing plate is adopted, compared with a single-layer degaussing plate, larger degaussing amount can be achieved, the amount of magnetic leakage transmitted to the vibration table top is reduced, meanwhile degaussing is more balanced, and the better degaussing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vibration tables, in particular to a demagnetization structure for an electric vibration table and the electric vibration table. Background Art

[0002] Vibration test is a typical environmental mechanical test and is widely used in mechanical simulation verification and reliability verification of automotive parts, aerospace products, etc.

[0003] During operation, an electrodynamic shaker may generate a certain amount of magnetic flux leakage due to the magnetic field. This leakage not only affects the performance of the shaker itself, but also can cause electromagnetic interference to test objects containing magnetic-field-sensitive components or materials, affecting the accuracy and reliability of test results. It can also cause electromagnetic interference to surrounding test equipment, sensors, and other sensitive components, affecting their performance. Excessive magnetic leakage can pose safety risks, such as damage to electronic equipment and electromagnetic radiation hazards to personnel. Therefore, demagnetization is a crucial step in ensuring that an electrodynamic shaker complies with safety standards. Summary of the Invention

[0004] The purpose of the present utility model is to provide a demagnetization structure for an electric vibration table and an electric vibration table to solve the above problems.

[0005] The technical solution adopted by this utility model is:

[0006] A demagnetization structure for an electric vibration table, the electric vibration table includes a moving coil assembly and a magnetic circuit assembly arranged in an upper and lower manner, an upper cover assembly is arranged above the magnetic circuit assembly, the moving coil in the moving coil assembly can extend out of the upper cover assembly to perform reciprocating motion, the demagnetization structure includes an outer upper demagnetization plate, an outer lower demagnetization plate, an inner upper demagnetization plate and an inner lower demagnetization plate, the outer upper demagnetization plate is arranged on the upper surface of the top cover plate of the upper cover assembly, the outer lower demagnetization plate is arranged on the lower surface of the top cover plate of the upper cover assembly, the magnetic field directions of the outer upper demagnetization plate and the outer lower demagnetization plate are upward, the inner upper demagnetization plate is arranged on the upper surface of the output end plate of the moving coil assembly, the inner lower demagnetization plate is arranged on the lower surface of the output end plate of the moving coil assembly, and the magnetic field directions of the inner upper demagnetization plate and the inner lower demagnetization plate are downward.

[0007] As a further improved technical solution of the present invention, the inner upper demagnetization plate is annular, and a plurality of screw through holes are provided on the inner upper demagnetization plate, so that the magnetic field of the inner upper demagnetization plate is evenly distributed.

[0008] As a further improved technical solution of the present invention, the inner upper demagnetization plate includes several concentrically arranged first annular plates, and the several first annular plates are separated from each other. Several screw through holes are provided on the several first annular plates. The magnetic field of each first annular plate is uniformly distributed, and the magnetic field of the first annular plate arranged away from the center of the circle is smaller than the magnetic field of the first annular plate arranged close to the center of the circle.

[0009] As a further improved technical solution of the present invention, the inner lower demagnetization plate includes a plurality of fan-shaped plates, the plurality of fan-shaped plates are separated from each other and combined to form a ring, and the magnetic fields of the plurality of fan-shaped plates are uniformly distributed.

[0010] As a further improved technical solution of the present invention, the structure of the outer upper demagnetization plate is consistent with the structure of the outer lower demagnetization plate.

[0011] As a further improved technical solution of the present invention, the outer upper demagnetization plate is ring-shaped, and the magnetic field of the outer upper demagnetization plate is evenly distributed.

[0012] As a further improved technical solution of the present invention, the outer upper demagnetization plate includes several concentrically arranged second annular plates, and the several second annular plates are separated from each other. The magnetic field of each second annular plate is uniformly distributed, and the magnetic field of the second annular plate arranged away from the center of the circle is greater than the magnetic field of the second annular plate arranged close to the center of the circle.

[0013] As a further improved technical solution of the present invention, the outer upper demagnetization plate and the outer lower demagnetization plate are bonded and fixed to the top cover plate of the upper cover assembly, and the shape and size of the outer upper demagnetization plate and the outer lower demagnetization plate match those of the top cover plate of the upper cover assembly.

[0014] As a further improved technical solution of the present invention, the inner upper demagnetization plate and the inner lower demagnetization plate are bonded to the output end plate of the moving coil assembly and fixed with connecting parts, and the inner upper demagnetization plate and the inner lower demagnetization plate match the shape and size of the output end plate of the moving coil assembly.

[0015] An electric vibration table includes a moving coil assembly, a magnetic circuit assembly and the demagnetization structure as described above, wherein the moving coil assembly is arranged in the magnetic circuit assembly and is coaxial with the magnetic circuit assembly, an upper cover assembly is arranged above the magnetic circuit assembly, and a lower cover assembly is arranged below the magnetic circuit assembly, and the moving coil in the moving coil assembly can extend out of the upper cover assembly to perform reciprocating motion.

[0016] The beneficial effects of the utility model are:

[0017] Through the above structure, the use of a double-layer demagnetization plate can achieve a greater demagnetization amount than a single-layer demagnetization plate, reducing the amount of leakage magnetic flux transmitted to the vibration table. At the same time, a more balanced demagnetization is achieved, achieving a better demagnetization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the electric vibration table;

[0019] Figure 2 It is a cross-sectional view of the demagnetization structure and moving coil assembly;

[0020] Figure 3 This is the upper view of the demagnetization structure and moving coil assembly;

[0021] Figure 4 It is a schematic diagram of the magnetic field path of the demagnetization structure;

[0022] Figure 5 2. It is a schematic diagram of magnetic field distribution of an embodiment of an inner upper demagnetization plate;

[0023] Figure 6 1 is a schematic structural diagram of an embodiment of an inner upper demagnetization plate;

[0024] Figure 7 1 is a schematic diagram of magnetic field distribution of another embodiment of the inner upper demagnetization plate;

[0025] Figure 8 1 is a schematic structural diagram of another embodiment of the inner upper demagnetization plate;

[0026] Figure 9 It is a schematic diagram of the magnetic field distribution of the inner lower demagnetization plate;

[0027] Figure 10 It is a structural diagram of the inner lower demagnetization plate;

[0028] Figure 11 2. It is a schematic diagram of magnetic field distribution of an embodiment of an outer upper demagnetization plate;

[0029] Figure 12 1 is a schematic structural diagram of an embodiment of an outer upper demagnetization plate;

[0030] Figure 13 1 is a schematic diagram of magnetic field distribution of another embodiment of the outer upper demagnetization plate;

[0031] Figure 14 It is a structural schematic diagram of another embodiment of the outer upper demagnetization plate.

[0032] Among them: 1-moving coil assembly, 11-output end plate, 2-magnetic circuit assembly, 3-upper cover assembly, 31-top cover plate, 4-lower cover assembly, 5-demagnetization structure, 51-outer upper demagnetization plate, 511-second annular plate, 52-outer lower demagnetization plate, 53-inner upper demagnetization plate, 531-screw through hole, 532-first annular plate, 54-inner lower demagnetization plate, 541-sector plate. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0034] If the present invention involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.), the directions involved need to be defined, for example, "To clearly express the positions and directions described in this invention, the end closest to the operator is the proximal end, and the end away from the operator is the distal end." Or, the paper can be used as a reference for definition. Of course, if the subsequent description defines the positional relationship between the two by mutual reference, this definition does not need to be included here.

[0035] A demagnetization structure for an electric vibration table, such as Figure 1 As shown, the electric vibration table includes a moving coil assembly 1 and a magnetic circuit assembly 2 arranged upper and lower, an upper cover assembly 3 is arranged above the magnetic circuit assembly 2, and a lower cover assembly 4 is arranged below the magnetic circuit assembly 2. The moving coil in the moving coil assembly 1 can extend out of the upper cover assembly 3 to perform reciprocating motion. The leakage magnetic field measurement position of the electric vibration table is at the upper part of the moving coil and is about one-quarter of the diameter of the moving coil. The leakage magnetic field is directed upward and is large in the middle and small around.

[0036] like Figures 2-4As shown, the demagnetization structure 5 includes an outer demagnetization plate and an inner demagnetization plate, both of which are annular. There are two outer demagnetization plates, each of which includes an outer upper demagnetization plate 51 and an outer lower demagnetization plate 52. The outer upper demagnetization plate 51 is arranged on the upper surface of the top cover plate 31 of the upper cover assembly 3, and the outer lower demagnetization plate 52 is arranged on the lower surface of the top cover plate 31 of the upper cover assembly 3. The magnetic field directions of the outer upper demagnetization plate 51 and the outer lower demagnetization plate 52 are upward. There are two inner demagnetization plates, including an inner upper demagnetization plate 53 and an inner lower demagnetization plate 54. The inner upper demagnetization plate 53 is arranged on the upper surface of the output end plate 11 of the moving coil assembly 1, and the inner lower demagnetization plate 54 is arranged on the lower surface of the output end plate 11 of the moving coil assembly 1. The output end plate 11 of the moving coil assembly 1 is located at the top of the moving coil assembly 1. The magnetic field directions of the inner upper demagnetization plate 53 and the inner lower demagnetization plate 54 are downward. The double-layer inner and outer demagnetization plates have a better demagnetization effect. The magnetic flux lines of the outer upper demagnetization plate 51, the outer lower demagnetization plate 52, the inner upper demagnetization plate 53 and the inner lower demagnetization plate 54 are combined into a circular magnetic field. This circular magnetic field generates a downward magnetic field at the leakage magnetic field measurement position, which just offsets the leakage magnetic field of the electric vibration table itself. In actual use, the outer upper degaussing plate 51 , the outer lower degaussing plate 52 , the inner upper degaussing plate 53 and the inner lower degaussing plate 54 can be used individually or in combination according to test requirements.

[0037] As an embodiment of the present invention, Figures 5-6 As shown, the inner upper demagnetization plate 53 is annular, and a number of screw through holes 531 are provided on the annular plate. The screw through holes 531 are used for connecting parts to pass through. The connecting parts connect and fix the dynamic coil assembly 1, the inner upper demagnetization plate 53 and the vibration table. The magnetic field of the inner upper demagnetization plate 53 is directed downward and evenly distributed.

[0038] As an embodiment of the present invention, Figures 7-8 As shown, the inner upper demagnetization plate 53 includes a plurality of concentrically arranged first annular plates 532. The plurality of first annular plates 532 are separated from each other and vary in size. The plurality of first annular plates 532 are combined to form a larger annular plate. The plurality of first annular plates 532 are provided with a plurality of screw holes 531. The magnetic field of each first annular plate 532 is directed downward and is evenly distributed. The magnetic field of the first annular plate 532 positioned away from the center is smaller than that of the first annular plate 532 positioned closer to the center. As one embodiment of the present invention, there are three first annular plates 532.

[0039] As an embodiment of the present invention, Figures 9-10As shown, the inner lower demagnetization plate 54 includes a plurality of sector plates 541, which are separated from each other and combined to form a ring. The magnetic field direction of the plurality of sector plates 541 is downward and evenly distributed, cooperating with the magnetic circuit assembly 2. As an embodiment of the present invention, the inner lower demagnetization plate 54 includes eight equally divided sector plates 541.

[0040] The structure of the outer upper degaussing plate 51 is consistent with that of the outer lower degaussing plate 52. Figures 11-12 As shown in FIG. 1 , as an embodiment of the present invention, the outer upper demagnetization plate 51 is annular, the inner diameter of the outer upper demagnetization plate 51 is larger than the outer diameter of the inner upper demagnetization plate 53, and the magnetic field of the outer upper demagnetization plate 51 is directed upward and evenly distributed. Figures 13-14 As shown, as another embodiment of the present invention, the outer upper demagnetization plate 51 includes a plurality of concentrically arranged second annular plates 511, the plurality of second annular plates 511 being separated from each other and combining to form a larger annular plate. The inner diameter of the outer upper demagnetization plate 51 is larger than the outer diameter of the inner upper demagnetization plate 53. The magnetic field of each second annular plate 511 is directed upward and uniformly distributed. The magnetic field of the second annular plate 511 disposed away from the center is greater than that of the second annular plate 511 disposed near the center. As an embodiment of the present invention, there are three second annular plates 511.

[0041] The outer degaussing plate is bonded and fixed to the top cover plate 31 of the upper cover assembly 3. The outer degaussing plate matches the shape and size of the top cover plate 31 of the upper cover assembly 3, so that the top cover plate 31 is not exposed. The inner degaussing plate is bonded and fixed to the output end plate 11 of the moving coil assembly 1 using a connector. The inner degaussing plate matches the shape and size of the output end plate 11 of the moving coil assembly 1.

[0042] The present utility model also provides an electric vibration table, which includes a moving coil assembly 1, a magnetic circuit assembly 2 and the demagnetization structure 5 as described above. The moving coil assembly 1 is arranged in the magnetic circuit assembly 2 and coaxially with the magnetic circuit assembly 2. An upper cover assembly 3 is arranged above the magnetic circuit assembly 2, and a lower cover assembly 4 is arranged below the magnetic circuit assembly 2. The moving coil in the moving coil assembly 1 can extend out of the upper cover assembly 3 to perform reciprocating motion.

[0043] The demagnetization structure of the electric vibration table provided by the utility model is a 5-stage electric vibration table, which uses the outer upper demagnetization plate 51 and the outer lower demagnetization plate 52 to surround the top cover plate 31 of the upper cover assembly 3, and uses the inner upper demagnetization plate 53 and the inner lower demagnetization plate 54 to surround the output end plate 11 of the dynamic coil assembly 1, thereby covering the upper part of the electric vibration table. When the electric vibration table is working, a part of the magnetic field inside the dynamic coil assembly 1 and the magnetic circuit assembly 2 will leak to one side of the vibration table surface. When the leakage magnetic field reaches the outer upper demagnetization plate 51, the outer lower demagnetization plate 52, the inner upper demagnetization plate 53 and the inner When using the side lower demagnetization plate 54, because the outer upper demagnetization plate 51, the outer lower demagnetization plate 52, the inner upper demagnetization plate 53, and the inner lower demagnetization plate 54 have high magnetic permeability and low magnetic resistance, leakage magnetic flux cannot pass through the above demagnetization plates, thereby reducing the amount of leakage magnetic flux transmitted to the vibration table. When a double-layer demagnetization plate is used, it can have a greater demagnetization amount than a single-layer demagnetization plate, achieving a better demagnetization effect. The specific structure of the outer upper demagnetization plate 51, the outer lower demagnetization plate 52, the inner upper demagnetization plate 53, and the inner lower demagnetization plate 54 can make the demagnetization structure 5 more balanced, making the electric vibration table suitable for test pieces sensitive to magnetic fields. At the same time, the outer upper demagnetization plate 51, the outer lower demagnetization plate 52, the inner upper demagnetization plate 53, and the inner lower demagnetization plate 54 are all arranged on the inner and outer sides of the dynamic coil assembly 1 and the upper cover assembly 3. Its design structure is simple, does not damage the internal structure of the electric vibration table, is easy to install, and is economical and practical.

[0044] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A demagnetization structure for an electric vibration table, the electric vibration table comprising a moving coil assembly (1) and a magnetic circuit assembly (2) arranged above each other, an upper cover assembly (3) being arranged above the magnetic circuit assembly (2), and a moving coil in the moving coil assembly (1) being able to extend out of the upper cover assembly (3) to perform reciprocating motion, characterized in that: The demagnetization structure (5) comprises an outer upper demagnetization plate (51), an outer lower demagnetization plate (52), an inner upper demagnetization plate (53) and an inner lower demagnetization plate (54); the outer upper demagnetization plate (51) is arranged on the upper surface of the top cover plate (31) of the upper cover assembly (3); the outer lower demagnetization plate (52) is arranged on the lower surface of the top cover plate (31) of the upper cover assembly (3); the magnetic field directions of the outer upper demagnetization plate (51) and the outer lower demagnetization plate (52) are upward; the inner upper demagnetization plate (53) is arranged on the upper surface of the output end plate (11) of the moving coil assembly (1); the inner lower demagnetization plate (54) is arranged on the lower surface of the output end plate (11) of the moving coil assembly (1); the magnetic field directions of the inner upper demagnetization plate (53) and the inner lower demagnetization plate (54) are downward.

2. The demagnetization structure for an electric vibration table according to claim 1, characterized in that: The inner upper demagnetization plate (53) is annular, and a plurality of screw through holes (531) are provided on the inner upper demagnetization plate (53). The magnetic field of the inner upper demagnetization plate (53) is evenly distributed.

3. The demagnetization structure for an electric vibration table according to claim 1, characterized in that: The inner upper demagnetization plate (53) comprises a plurality of concentrically arranged first annular plates (532), the plurality of first annular plates (532) being separated from each other, a plurality of screw through holes (531) being provided on the plurality of first annular plates (532), the magnetic field of each first annular plate (532) being uniformly distributed, and the magnetic field of the first annular plate (532) being arranged away from the center of the circle being smaller than the magnetic field of the first annular plate (532) being arranged close to the center of the circle.

4. The demagnetization structure for an electrodynamic vibration table according to claim 3, characterized in that: The inner lower demagnetizing plate (54) comprises a plurality of sector-shaped plates (541), the plurality of sector-shaped plates (541) are separated from each other and combined to form a ring shape, and the magnetic fields of the plurality of sector-shaped plates (541) are uniformly distributed.

5. The demagnetization structure for an electrodynamic vibration table according to claim 3, characterized in that: The structure of the outer upper demagnetization plate (51) is consistent with the structure of the outer lower demagnetization plate (52).

6. The demagnetization structure for an electrodynamic vibration table according to claim 5, characterized in that: The outer upper demagnetization plate (51) is annular, and the magnetic field of the outer upper demagnetization plate (51) is evenly distributed.

7. The demagnetization structure for an electrodynamic vibration table according to claim 5, characterized in that: The outer upper demagnetization plate (51) comprises a plurality of concentrically arranged second annular plates (511), the plurality of second annular plates (511) being separated from each other, the magnetic field of each second annular plate (511) being uniformly distributed, and the magnetic field of the second annular plate (511) arranged away from the center of the circle being greater than the magnetic field of the second annular plate (511) arranged close to the center of the circle.

8. The demagnetization structure for an electrodynamic vibration table according to claim 5, characterized in that: The outer upper demagnetization plate (51) and the outer lower demagnetization plate (52) are bonded and fixed to the top cover plate (31) of the upper cover assembly (3); the outer upper demagnetization plate (51) and the outer lower demagnetization plate (52) match the shape and size of the top cover plate (31) of the upper cover assembly (3).

9. The demagnetization structure for an electrodynamic vibration table according to claim 3, characterized in that: The inner upper demagnetization plate (53) and the inner lower demagnetization plate (54) are bonded to the output end plate (11) of the moving coil assembly (1) and fixed using a connecting piece. The inner upper demagnetization plate (53) and the inner lower demagnetization plate (54) match the shape and size of the output end plate (11) of the moving coil assembly (1).

10. An electric vibration table, characterized in that: The invention comprises a moving coil assembly (1), a magnetic circuit assembly (2) and a demagnetization structure (5) as described in any one of claims 1 to 9, wherein the moving coil assembly (1) is arranged in the magnetic circuit assembly (2) and is coaxially arranged with the magnetic circuit assembly (2), an upper cover assembly (3) is arranged above the magnetic circuit assembly (2), and a lower cover assembly (4) is arranged below the magnetic circuit assembly (2), and the moving coil in the moving coil assembly (1) can extend out of the upper cover assembly (3) to perform reciprocating motion.

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