Air-cooled vibration table

Abstract

The application provides an air-cooled vibration table, which comprises a magnetic cylinder body, upper and lower magnetic rings, upper and lower magnetic cylinder covers, an excitation coil and a moving coil assembly; the upper and lower magnetic rings are respectively arranged on the upper and lower sides of the magnetic cylinder body; the upper and lower magnetic cylinder covers are respectively arranged on the end portions of the upper and lower magnetic rings to form a movement cavity between the magnetic cylinder body, the upper and lower magnetic rings; the moving coil assembly comprises a driving coil and an annular support, and an annular air gap is formed between the driving coil and the annular support; a plurality of air vents are annularly arranged on the circumferential side of the upper magnetic ring, and the air vents are radially and obliquely arranged relative to the upper magnetic ring to form an air inlet base circle in the movement cavity, wherein the diameter R1 of the air inlet base circle is (1 / 2-2 / 3)R2, and R2 is the inner diameter of the upper magnetic ring. The annular air gap is kept directly below the cyclone air mass, which is most conducive to the cyclone air entering the annular air gap, and can inhibit the air backflow in the upper and lower magnetic rings, thereby significantly reducing the internal backflow of the air-cooled vibration table and improving the heat dissipation effect of the vibration table.

Description

Technical Field

[0001] This invention relates to the field of vibration test bench technology, and specifically to an air-cooled vibration bench. Background Technology

[0002] Because vibration tables generate a significant amount of heat during operation, a suitable heat dissipation structure is essential. Currently, heat dissipation methods for electric vibration tables include air cooling and water cooling. Air cooling is simple in structure and low in cost, making it suitable for most tonnage test benches. Water cooling offers high heat dissipation efficiency but is expensive and structurally complex. Furthermore, the cooling water within the hollow conductors can affect performance indicators; therefore, water cooling is primarily used for large-tonnage test benches. By optimizing the structural design, improving the cooling efficiency of the fan, and expanding the tonnage range applicable to the air cooling device, costs can be effectively reduced. A well-designed air cooling structure is particularly suitable for small-tonnage, large-displacement test benches.

[0003] A vibration table is disclosed in the prior art, as shown in the attached figure. Figure 1 As shown, it includes a base a, a moving coil b, a drive coil c, and an excitation coil d. The drive coil c is located below the moving coil b, both within the magnetic cylinder body, which is located inside the base a. The excitation coil d is connected to the magnetic cylinder body and positioned around the drive coil c, with an annular air gap between them. The excitation coil d is connected to a DC power supply, generating a high magnetic flux within the annular air gap. The moving coil b is suspended in the annular air gap of the base by an air spring below. When an alternating current passes through the drive coil c, an electromagnetic force is generated on the windings of the drive coil c, causing the moving coil to reciprocate upward and downward.

[0004] Currently, in order to increase the displacement of the moving coil, an upper magnetic ring and a lower magnetic ring have been added to the vibration table. The two are arranged from top to bottom to provide space for the movement of the moving coil. However, backflow can easily form inside the upper and lower magnetic rings, affecting the heat dissipation of the vibration table. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that in order to increase the displacement of the moving coil, an upper magnetic ring and a lower magnetic ring are added to the conventional vibration table. The two are arranged from top to bottom to provide space for the movement of the moving coil. However, backflow air can easily form in the upper and lower magnetic rings, which affects the heat dissipation of the vibration table.

[0006] Therefore, the present invention provides an air-cooled vibration table, comprising:

[0007] The magnetic cylinder body has an inwardly protruding annular support on its inner side;

[0008] The upper magnetic ring and the lower magnetic ring are respectively located on the upper and lower sides of the magnetic cylinder body;

[0009] The upper magnetic cylinder cover and the lower magnetic cylinder cover are respectively disposed at the end of the upper magnetic ring and the end of the lower magnetic ring, so that a moving cavity is formed between the magnetic cylinder body, the upper magnetic ring and the lower magnetic ring;

[0010] An excitation coil is disposed on both sides of the annular support. The excitation coil is adapted to carry a direct current to establish a magnetic field in the moving cavity.

[0011] A moving coil assembly includes a moving part and a drive coil wound around the surface of the moving part. The drive coil is disposed in the moving cavity and is located on the side of the excitation coil, and the drive coil is adapted to carry an alternating current.

[0012] The drive coil is located inside the annular support, and an annular air gap is formed between the drive coil and the annular support;

[0013] The upper magnetic ring is provided with a plurality of ventilation openings arranged in a ring around its periphery. The plurality of ventilation openings are inclined relative to the radial direction of the upper magnetic ring to form an air inlet base circle in the moving cavity. The diameter of the air inlet base circle is R1 = (1 / 2 - 2 / 3)R2, where R2 is the inner diameter of the upper magnetic ring.

[0014] Optionally, it also includes a flow guide disposed within the upper magnetic ring and / or the lower magnetic ring to fill the side space of the upper magnetic ring and / or the lower magnetic ring, thereby reducing air backflow within the upper magnetic ring and / or the lower magnetic ring.

[0015] Optionally, the flow guide is disposed on one side of the excitation coil, and the flow guide is provided with a flow guide hole to guide the airflow in the upper magnetic ring and / or the lower magnetic ring to the excitation coil.

[0016] Optionally, the flow guide includes at least two annular flow guide plates, which are respectively disposed inside the upper magnetic ring and the lower magnetic ring;

[0017] The annular guide plate is provided with guide holes to guide the airflow inside the upper and lower magnetic rings to the opposite sides of the excitation coil.

[0018] Optionally, the flow guide hole has the same slope as the vent.

[0019] Optionally, it also includes a dustproof net connected to the upper magnetic ring, and the dustproof net is located at the vent.

[0020] Optionally, it also includes a bottom exhaust assembly connected to the lower magnetic cylinder head. The bottom of the moving part passes through the lower magnetic cylinder head and is disposed in the bottom exhaust assembly. The lower magnetic cylinder head is provided with a plurality of through holes that connect the moving cavity with the interior of the bottom exhaust assembly.

[0021] Optionally, the bottom exhaust assembly includes a shroud whose interior communicates with the moving cavity. The shroud includes an air outlet that is offset from the center of the shroud to reduce air backflow within the shroud.

[0022] Optionally, the shroud further includes an adapter connected to the air outlet, and a seal is provided at the connection between the adapter and the air outlet.

[0023] Optionally, the bottom exhaust assembly further includes a support plate connected between the air shroud and the lower magnetic cylinder head to provide movement space for the moving part.

[0024] The air-cooled vibration table provided by this invention has the following advantages:

[0025] 1. This invention provides an air-cooled vibration table, comprising a magnetic cylinder body, an upper magnetic ring and a lower magnetic ring, an upper magnetic cylinder cover and a lower magnetic cylinder cover, an excitation coil, and a moving coil assembly. The magnetic cylinder body has an inwardly protruding annular support. The upper and lower magnetic rings are respectively disposed on the upper and lower sides of the magnetic cylinder body. The upper and lower magnetic cylinder covers are respectively disposed at the ends of the upper and lower magnetic rings, forming a moving cavity between the magnetic cylinder body, the upper magnetic ring, and the lower magnetic ring. The excitation coil is disposed on both sides of the annular support, and the excitation coil is adapted to carry a direct current to establish a magnetic field within the moving cavity. The moving coil assembly includes... The device includes a moving part and a drive coil wound around the surface of the moving part. The drive coil is located inside the moving cavity and on the side of the excitation coil, and the drive coil is adapted to carry alternating current. The drive coil is located inside the annular support, and an annular air gap is formed between the drive coil and the annular support. The upper magnetic ring has a plurality of annularly arranged ventilation openings on its circumference. The plurality of ventilation openings are radially inclined relative to the upper magnetic ring to form an air inlet base circle in the moving cavity. The diameter of the air inlet base circle is R1 = (1 / 2 - 2 / 3)R2, where R2 is the inner diameter of the upper magnetic ring.

[0026] This air-cooled vibration table uses an oblique air intake at the upper magnetic ring vent, which causes the airflow inside the vibration table to rotate. The intake base circle diameter R1 = (1 / 2 - 2 / 3)R2 is set so that the annular air gap is directly below the swirling air mass (i.e., the intake base circle), which is most conducive to the swirling air entering the annular air gap. At the same time, it can suppress the backflow of air in the upper and lower magnetic rings, which can significantly reduce the backflow inside the vibration table and thus improve the heat dissipation effect of the vibration table, thereby reducing the impact of backflow caused by the setting of the upper and lower magnetic rings.

[0027] 2. The present invention provides an air-cooled vibration table, which further includes a guide member disposed in the upper magnetic ring and / or the lower magnetic ring to fill the side space of the upper magnetic ring and / or the lower magnetic ring, thereby reducing air backflow in the upper magnetic ring and / or the lower magnetic ring.

[0028] In this air-cooled vibration table structure, the large space on the sides of the upper and lower magnetic rings causes air backflow and reduces the gas velocity. Therefore, flow guides are fixed to the inner walls of the upper and lower magnetic rings. These flow guides are annular to prevent interference with the moving parts. The flow guides are made of low-density alloys such as aluminum, or non-metallic materials, to reduce the mass of the upper magnetic ring.

[0029] 3. This invention provides an air-cooled vibration table, wherein the airflow guide is disposed on one side of the excitation coil, and the airflow guide is provided with airflow guide holes to guide the airflow in the upper magnetic ring and / or the lower magnetic ring to the excitation coil. The airflow guide includes at least two annular airflow guide plates, which are respectively disposed in the upper magnetic ring and the lower magnetic ring; the annular airflow guide plates are provided with airflow guide holes to guide the airflow in the upper magnetic ring and the lower magnetic ring to the opposite sides of the excitation coil.

[0030] This air-cooled vibration table structure includes two annular guide plates as its airflow guide components. These two annular guide plates are respectively disposed within the upper and lower magnetic rings, and are positioned outside the excitation coils within the upper and lower magnetic rings, in close contact with the excitation coils. Since the excitation coils require heat dissipation, and the annular guide plates impede air movement towards the excitation coils, airflow guide holes are provided on the annular guide plates to allow air to pass through and be blown onto the surface of the excitation coils, thus dissipating heat from the excitation coils.

[0031] 4. The present invention provides an air-cooled vibration table, wherein the slope of the guide hole is consistent with that of the ventilation opening.

[0032] In this air-cooled vibration table, the guide hole has the same slope as the ventilation opening, meaning the guide hole is also opened at an angle, and the slope of the guide hole is the same as that of the ventilation opening. The purpose is to allow the gas entering the moving cavity through the ventilation opening to form a swirling air mass, and the angled guide hole can facilitate the entry of the swirling air mass, thereby reducing the obstruction of the airflow by the guide hole wall.

[0033] 5. The present invention provides an air-cooled vibration table, wherein the bottom exhaust assembly includes a shroud, the interior of which is in communication with the moving cavity, the shroud includes an air outlet, the air outlet being offset from the center of the shroud to reduce air backflow within the shroud.

[0034] This air-cooled vibration table has a cylindrical air shroud with an air outlet. The air outlet is offset from the center of the air shroud and is specifically arranged along the circumference of the air shroud. Lateral air extraction is used to reduce the backflow of air inside the air shroud. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of an air-cooled vibration table in the prior art;

[0037] Figure 2 This is a schematic diagram of the structure of the air-cooled vibration table provided in an embodiment of the present invention;

[0038] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0039] Figure 4 for Figure 3 Enlarged view of the structure at point B;

[0040] Figure 5 This is a schematic diagram of the upper magnetic ring and flow guide in the air-cooled vibration table provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the air shroud in the air-cooled vibration table provided in an embodiment of the present invention;

[0042] Figure 7 This is a top view of the air shroud in an air-cooled vibration table provided in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the air intake base circle formed by air intake at the ventilation port of the upper magnetic ring in an embodiment of the present invention.

[0044] Figure 9 This is a graph showing the relationship between air velocity and time in the annular air gap of an air-cooled vibration table provided in an embodiment of the present invention.

[0045] Figure 10 This is a schematic diagram of the air recirculation formed inside the upper magnetic ring in the air-cooled vibration table provided in an embodiment of the present invention;

[0046] Figure 11 This is a diagram showing the distribution of the magnetic field within the annular air gap in an air-cooled vibration table provided in an embodiment of the present invention.

[0047] Figure 12 A diagram showing the internal airflow state of an air-cooled vibration table when the ventilation opening on the upper magnetic ring is of the direct-flow type in the existing technology.

[0048] Figure 13This is a diagram showing the internal airflow of the air-cooled vibration table when the upper magnetic ring of the vibration table has an oblique ventilation opening, as provided in an embodiment of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] a-Frame; b-Moving coil; c-Drive coil; d-Excitation coil;

[0051] 1-Magnetic cylinder body; 11-Annular support;

[0052] 2a - Upper magnetic ring; 21 - Ventilation opening; 2b - Lower magnetic ring;

[0053] 3a - Upper magnetic cylinder head; 3b - Lower magnetic cylinder head;

[0054] 4-Excitation coil;

[0055] 5-Moving coil assembly; 51-Moving component; 52-Drive coil; 53-Center magnetic pole;

[0056] 6- Annular air gap;

[0057] 7-Flow guide; 71-Flow guide hole;

[0058] 81-Wind cover; 81a-Adapter; 82-Support plate. Detailed Implementation

[0059] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

[0061] Example

[0062] Current shaking tables, such as Figure 1As shown, the system includes a base a, a moving coil b, a drive coil c, and an excitation coil d. The drive coil c is located below the moving coil b, both within the magnetic cylinder body, which is located inside the base a. The excitation coil d is connected to the magnetic cylinder body and positioned around the drive coil c, with an annular air gap between them. The excitation coil d is connected to a DC power supply, generating a high magnetic flux within the annular air gap. The moving coil b is suspended in the annular air gap of the base by an air spring below. When an alternating current passes through the drive coil c, an electromagnetic force is generated on the windings of the drive coil c, causing the moving coil to reciprocate upward and downward.

[0063] like Figure 2 As shown, in order to increase the displacement of the moving coil, an upper magnetic ring 2a, a lower magnetic ring 2b, and a bottom exhaust assembly were added to the existing vibration table. The three are arranged from top to bottom to provide space for the movement of the moving coil. Figure 10 This is a schematic diagram of the air recirculation formed inside the upper magnetic ring 2a. Therefore, it is easy to form recirculation air inside the upper magnetic ring 2a and the lower magnetic ring 2b, which affects the heat dissipation of the vibration table.

[0064] Therefore, this embodiment provides an air-cooled vibration table, such as... Figure 2 As shown, it includes a magnetic cylinder body 1, an upper magnetic ring 2a, a lower magnetic ring 2b, an upper magnetic cylinder head 3a, a lower magnetic cylinder head 3b, an excitation coil 4, a moving coil assembly 5, a guide component 7, and a bottom exhaust assembly.

[0065] In this embodiment, as Figure 2 As shown, the upper magnetic ring 2a and the lower magnetic ring 2b are respectively disposed on the upper and lower sides of the magnetic cylinder body 1, and the upper magnetic cylinder cover 3a and the lower magnetic cylinder cover 3b are respectively disposed at the ends of the upper magnetic ring 2a and the lower magnetic ring 2b, so that a moving cavity is formed between the magnetic cylinder body 1, the upper magnetic ring 2a and the lower magnetic ring 2b. An inwardly protruding annular support 11 is provided inside the magnetic cylinder body 1, and an excitation coil 4 is disposed on the upper and lower sides of the annular support 11. The excitation coil 4 is adapted to carry a direct current to establish a magnetic field within the moving cavity. Figure 11 This is a diagram showing the distribution of the magnetic field in the vibration table provided in this embodiment.

[0066] In this embodiment, as Figure 2 and Figure 3As shown, the moving coil assembly 5 includes a moving part 51, a drive coil 52 wound around the surface of the moving part 51, and a central magnetic pole 53. The upper end of the moving part 51 passes through the upper magnetic cylinder head 3a and protrudes from the surface of the upper magnetic cylinder head 3a, and the lower end passes through the lower magnetic cylinder head 3b and is located in the bottom exhaust assembly. The central magnetic pole 53 is columnar and fixed between the upper magnetic cylinder head 3a and the lower magnetic cylinder head 3b. The middle part of the moving part 51 is located inside the central magnetic pole 53, and an air spring is provided at its bottom, so that the moving part 51 is suspended in the moving cavity of the vibration table by the lower air spring. The drive coil 52 is wound around the surface of the moving part 51 and is always inside the moving cavity. The drive coil 52 is located on the side of the excitation coil 4, and the drive coil 52 is suitable for passing an alternating current.

[0067] In this embodiment, as Figure 4 As shown, the drive coil 52 is always inside the annular support 11, and an annular air gap 6 is formed between the drive coil 52 and the annular support 11, with an inner diameter of R2.

[0068] In this embodiment, the backflow of air inside the vibration table is easily formed. Specifically, the upper magnetic ring 2a is a hollow cylinder. When the gas flows from the upper magnetic ring 2a to the annular air gap 6, it should ideally be laminar flow. However, in reality, due to the extremely narrow annular air gap 6, when the air flows from the large space to the small space, most of the air is blocked by the excitation coil 4, the magnetic cylinder 1, etc., and the flow state is turbulent. After some gas particles collide with the wall, backflow occurs.

[0069] And the drive coil 52, after being energized with alternating current, undergoes sinusoidal motion. The intake path of the cooling air is fixed. Due to the viscosity of the air on the surface of the drive coil 52, as the drive coil 52 moves, the viscosity gradient on its surface increases and decreases, causing the airflow velocity to... Figure 9 As shown. When the drive coil 52 moves up and down, the air volume between the upper magnetic ring 2a and the lower magnetic ring 2b changes instantaneously, which will cause instantaneous pressure difference changes and also cause local backflow.

[0070] Therefore, such as Figure 5 As shown, in this embodiment, the upper magnetic ring 2a has a plurality of annularly arranged ventilation openings 21 around its periphery. These ventilation openings 21 are radially inclined relative to the upper magnetic ring 2a to form an air intake base circle within the moving cavity. Specifically, as... Figure 8 As shown, Figure 8 The diagram illustrates the air intake base circle formed by the air intake at the ventilation port 21 of the upper magnetic ring 2a in the vibration table. As can be seen from the diagram, the ventilation ports 21 are all angled, allowing the gas entering the upper magnetic ring 2a from the ventilation ports 21 to... Figure 8 As shown, an air inlet base circle is formed inside the upper magnetic ring 2a. In this embodiment, the diameter of the air inlet base circle R1 = (1 / 2 - 2 / 3)R2, where R2 is the inner diameter of the upper magnetic ring 2a. Figure 12 As shown, Figure 12 The diagram shows the airflow state inside the vibration table when the upper magnetic ring 2a and the upper ventilation port 21 are straight-through. As can be seen from the diagram, when the ventilation port 21 is straight-through, the airflow backflow inside the vibration table is more serious, which affects the heat dissipation of the vibration table. Figure 13 The diagram illustrates the airflow state inside the vibration table when the upper vent 21 of the upper magnetic ring 2a is angled, and the inlet base circle diameter R1 = (1 / 2 - 2 / 3)R2. As shown in the diagram, by setting the upper vent 21 of the upper magnetic ring 2a to an angled inlet, the airflow inside the vibration table exhibits a certain rotational state. Furthermore, setting the inlet base circle diameter R1 = (1 / 2 - 2 / 3)R2 ensures that the annular air gap 6 is positioned directly below the swirling air mass (i.e., the inlet base circle), which is most conducive to the swirling airflow entering the annular air gap 6. Simultaneously, it suppresses air backflow within the upper magnetic ring 2a and lower magnetic ring 2b, significantly reducing backflow inside the vibration table and thus improving its heat dissipation effect. Moreover, setting the vent 21 to an angled inlet avoids direct frontal impact of the airflow, reducing initial velocity loss and increasing the flow velocity entering the annular air gap 6.

[0071] In some embodiments, an annular groove for installing a dustproof screen is provided on the outer side of the vent 21, and the dustproof screen is fixed to the side of the upper magnetic ring 2a by screws.

[0072] In this embodiment, as Figure 2 and Figure 3 As shown, the flow guide 7 is disposed within the upper magnetic ring 2a and the lower magnetic ring 2b. Because the lateral spaces of the upper magnetic ring 2a and the lower magnetic ring 2b are large, this causes air backflow and reduces the gas velocity. Therefore, the flow guide 7 is fixed to the inner wall of the upper magnetic ring 2a and the lower magnetic ring 2b. The flow guide 7 is annular to prevent it from interfering with the moving part 51. The flow guide 7 is made of a low-density alloy such as aluminum, or a non-metallic material, to reduce the mass of the upper magnetic ring 2a. In some embodiments, the flow guide 7 can also be disposed separately within the upper magnetic ring 2a or the lower magnetic ring 2b.

[0073] In this embodiment, as Figures 2 to 5 As shown, the airflow guide 7 includes two annular airflow guide plates, which are respectively disposed inside the upper magnetic ring 2a and the lower magnetic ring 2b, and are located outside the excitation coil 4 inside the upper magnetic ring 2a and the lower magnetic ring 2b. Since the excitation coil 4 needs to dissipate heat, and the arrangement of the annular airflow guide plates hinders the movement of air onto the excitation coil 4, airflow guide holes 71 are opened on the annular airflow guide plates to allow air to be blown onto the surface of the excitation coil 4 through the airflow guide holes 71 to dissipate heat from the excitation coil 4.

[0074] In this embodiment, the slope of the guide hole 71 is the same as that of the vent 21, that is, the guide hole 71 is also opened at an angle, and the slope of the guide hole 71 is the same as that of the vent 21. The purpose is to make it easier for the swirling air mass to enter the moving cavity after the gas enters through the vent 21, so as to reduce the obstruction of the airflow by the hole wall of the guide hole 71.

[0075] In this embodiment, as Figure 2 As shown, the annular support 11 has a through hole. After the air enters the interior of the upper magnetic ring 2a through the ventilation port 21 on the upper magnetic ring 2a, part of the airflow goes from the guide hole 71 of the guide member 7 on the excitation coil 4 to the upper excitation coil 4, then flows to the through hole of the annular support 11 of the magnetic cylinder body 1, then to the lower excitation coil 4, and finally flows into the lower magnetic ring 2b from the guide hole 71 on the guide member 7 on the side of the lower excitation coil 4, and is finally drawn out by the fan.

[0076] In this embodiment, as Figure 2 As shown, the bottom exhaust assembly includes a fan shroud 81 and a support plate 82. The support plate 82 is fixed below the lower magnetic cylinder head 3b, and the lower magnetic cylinder head 3b has several through holes that connect the moving cavity to the inside of the support plate 82. The purpose of setting the support plate 82 is to provide space for the moving part 51 to move.

[0077] In this embodiment, as Figure 6 and Figure 7 As shown, the fan shroud 81 is cylindrical and includes an air outlet. The air outlet is offset from the center of the fan shroud 81, specifically arranged along the circumference of the fan shroud 81, using lateral air extraction to reduce air backflow within the fan shroud 81. The fan shroud 81 also includes an adapter 81a, which communicates with the air outlet, and a seal is provided at the connection between the adapter 81a and the air outlet.

[0078] In some implementations, the shroud 81 and the support plate 82 can also be a single unit, which mainly provides space for the moving part 51 to move. The key is to ensure airtightness and ensure the air pressure.

[0079] In the air-cooled vibration table provided in this embodiment, air enters the vibration table from the ventilation port 21 of the upper magnetic ring 2a to form a rotating airflow. Part of the air flows into the excitation coil 4 through the guide 7, and part of the air rotates into the annular air gap 6. The two parts of the air eventually merge into the lower magnetic ring 2b and are discharged through the air outlet of the lower hood 81.

[0080] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A wind-cooled vibration table, comprising: The magnetic cylinder body (1) has an inwardly protruding annular support (11) on its inner side. The upper magnetic ring (2a) and the lower magnetic ring (2b) are respectively disposed on the upper and lower sides of the magnetic cylinder body (1); The upper magnetic cylinder cover (3a) and the lower magnetic cylinder cover (3b) are respectively disposed at the end of the upper magnetic ring (2a) and the end of the lower magnetic ring (2b), so that a moving cavity is formed between the magnetic cylinder body (1), the upper magnetic ring (2a) and the lower magnetic ring (2b); An excitation coil (4) is provided on both sides of the annular support (11). The excitation coil (4) is adapted to carry a direct current to establish a magnetic field in the moving cavity. The moving coil assembly (5) includes a moving part (51) and a drive coil (52) wound on the surface of the moving part (51). The drive coil (52) is located in the moving cavity and is on the side of the excitation coil (4). The drive coil (52) is adapted to carry an alternating current. Its features are: The driving coil (52) is located inside the annular support (11), and an annular air gap (6) is formed between the driving coil (52) and the annular support (11); The upper magnetic ring (2a) is provided with a plurality of ventilation openings (21) arranged in a ring around its periphery. The plurality of ventilation openings (21) are radially inclined relative to the upper magnetic ring (2a) to form an air inlet base circle in the moving cavity. The diameter of the air inlet base circle is R1=(1 / 2-2 / 3)R2, where R2 is the inner diameter of the upper magnetic ring (2a). It also includes: a flow guide (7) disposed within the upper magnetic ring (2a) and / or the lower magnetic ring (2b) to fill the side space of the upper magnetic ring (2a) and / or the lower magnetic ring (2b) to reduce air backflow within the upper magnetic ring (2a) and / or the lower magnetic ring (2b); the flow guide (7) is disposed on one side of the excitation coil (4), and the flow guide (7) is provided with a flow guide hole (71) to guide the airflow within the upper magnetic ring (2a) and / or the lower magnetic ring (2b) to the excitation coil (4); The slope of the guide hole (71) is the same as that of the vent (21).

2. The air-cooled vibration table according to claim 1, characterized in that, The flow guide (7) includes at least two annular flow guide plates, which are respectively disposed inside the upper magnetic ring (2a) and the lower magnetic ring (2b); The annular guide plate is provided with guide holes to guide the airflow inside the upper magnetic ring (2a) and the lower magnetic ring (2b) to the opposite sides of the excitation coil (4).

3. The air-cooled vibration table according to claim 1 or 2, characterized in that, It also includes a dustproof net connected to the upper magnetic ring (2a), and the dustproof net is located at the vent (21).

4. The air-cooled vibration table according to claim 1 or 2, characterized in that, It also includes a bottom exhaust assembly connected to the lower magnetic cylinder head (3b). The bottom of the moving part (51) passes through the lower magnetic cylinder head (3b) and is located inside the bottom exhaust assembly. The lower magnetic cylinder head (3b) is provided with several through holes that connect the moving cavity to the inside of the bottom exhaust assembly.

5. The air-cooled vibration table according to claim 4, characterized in that, The bottom exhaust assembly includes a shroud (81) whose interior is in communication with the moving cavity. The shroud (81) includes an air outlet, which is offset from the center of the shroud (81) to reduce the backflow of air within the shroud (81).

6. The air-cooled vibration table according to claim 5, characterized in that, The shroud (81) also includes an adapter (81a) that communicates with the air outlet, and a sealing element is provided at the connection between the adapter (81a) and the air outlet.

7. The air-cooled vibration table according to claim 5, characterized in that, The bottom exhaust assembly also includes a support plate (82) connected between the shroud (81) and the lower magnetic cylinder head (3b) to provide movement space for the moving part (51).

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