Magnetic adsorption type lifting mechanism

Abstract

The invention relates to a magnetic adsorption type lifting mechanism which comprises a first base, a magnetic bearing seat and a lifting assembly, the magnetic bearing seat of the magnetic adsorption type lifting mechanism is provided with a bearing face used for bearing a PCBA board, and the bearing face of the magnetic adsorption type lifting mechanism is provided with a top column. The magnetic adsorption type lifting mechanism lifting assembly is connected between the magnetic adsorption type lifting mechanism magnetic bearing seat and the magnetic adsorption type lifting mechanism first base. The magnetic adsorption type lifting mechanism lifting assembly is used for driving the magnetic adsorption type lifting mechanism magnetic bearing seat to ascend and descend relative to the first base. The magnetic bearing seat with a magnetic adsorption function is arranged as a direct bearing part of the PCBA board, and the PCBA board is fixed by utilizing uniformly distributed surface adsorption force generated by the magnetic bearing seat. According to the magnetic adsorption type lifting mechanism, the PCBA board is adsorbed through the magnetic bearing seat, a traditional centralized stress fixing scheme is avoided, and damage to the PCBA board in the fixing and detecting process can be well avoided.

Description

Technical Field

[0001] This invention relates to the field of circuit board testing technology, and in particular to a magnetic adsorption lifting mechanism. Background Technology

[0002] In the manufacturing and testing of printed circuit board assemblies (PCBAs), especially in precision electrical testing processes such as flying probe testing, the ability to stably, reliably, and non-destructively fix the PCBA board is a crucial technological foundation. Traditional fixing methods mainly rely on mechanical clamping or vacuum adsorption.

[0003] Mechanical clamping typically applies pressure from the board edge or specific points using screws or clamps. This method is prone to stress concentration, especially for thin PCBA boards or those with fragile components. Excessive local pressure can directly cause board bending, component damage, or solder joint cracking. Furthermore, the clamps and clamps may obstruct the testing area, restricting the probe's movement path. Vacuum adsorption relies on creating negative pressure beneath the PCBA board for fixation, requiring the board itself to have sufficient structural strength and airtightness. For PCBAs with porous, uneven, or flexible areas, the adsorption effect is significantly reduced, and fixation may even fail due to localized air leakage. In addition, continuous negative pressure adsorption can also generate uneven tensile stress on the board, posing a potential risk of deformation. Summary of the Invention

[0004] Based on this, this application provides a magnetic adsorption lifting mechanism that uses a magnetic support to adsorb PCBA boards, avoiding the traditional concentrated stress fixing scheme and effectively preventing damage to the PCBA boards during fixing and testing.

[0005] A magnetic adsorption lifting mechanism includes a first base, a magnetic support seat, and a lifting assembly. The magnetic support seat has a support surface for supporting a PCBA board, and a top column is provided on the support surface. The lifting assembly is connected between the magnetic support seat and the first base, and the lifting assembly is used to drive the magnetic support seat to lift relative to the first base.

[0006] In magnetic adsorption lifting mechanisms, a magnetic support base with magnetic adsorption function is used as the direct support component for the PCBA board. The evenly distributed surface adsorption force generated by this support base secures the PCBA board. This method fundamentally replaces traditional concentrated stress fixing methods that rely on screw fastening or clamp clamping. When the PCBA board is placed on the magnetic support base, the magnetic force acts evenly on the bottom area of ​​the PCBA board, thus avoiding the generation of localized pressure points. This effectively prevents bending, crushing, or damage to the PCBA board due to stress concentration during fixing and subsequent flying probe testing.

[0007] In one embodiment, the bottom of the top post is provided with a magnetic element.

[0008] In one embodiment, there are multiple magnetic elements arranged around the top post.

[0009] In one embodiment, the magnetic support includes a magnetic support plate and an auxiliary magnetic guide plate stacked together, the support surface is located on the side of the magnetic support plate opposite to the auxiliary magnetic guide plate, and the lifting assembly is connected to the magnetic support plate or the auxiliary magnetic guide plate.

[0010] In one embodiment, a second base and a fine-tuning module are also included, the fine-tuning module being connected between the first base and the second base, the fine-tuning module being used to adjust the tilt of the first base relative to the second base.

[0011] In one embodiment, the fine-tuning module includes a first connector, a second connector, and a screw. The first connector is fixed to the first base, the second connector is fixed to the second base, and the screw is assembled between the first connector and the second connector to adjust the gap between the first connector and the second connector.

[0012] In one embodiment, the first base has a rectangular structure, and the fine-tuning module is provided on at least two opposite sides of the first base.

[0013] In one embodiment, the lifting assembly includes a drive assembly, a transmission nut, and a lead screw. One end of the lead screw is fixed to the magnetic support base. The drive assembly is disposed on the first base, and the transmission nut is rotatably connected to the first base. The drive assembly, the transmission nut, and the lead screw are sequentially connected in a transmission manner.

[0014] In one embodiment, the lead screw is suspended at one end away from the magnetic support and passing through the drive nut.

[0015] In one embodiment, the drive assembly includes a drive motor and a transmission belt, and there are multiple transmission nuts and lead screws that correspond one-to-one. The drive motor is driven by the transmission belt, and the transmission belt is driven by each of the transmission nuts. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a magnetic adsorption lifting mechanism according to an embodiment; Figure 2 This is an exploded view of the structure of a magnetic adsorption lifting mechanism according to one embodiment.

[0017] Figure label: Magnetic adsorption lifting mechanism 100; first base 200; magnetic bearing seat 300; bearing surface 310; top column 311; magnetic component 3110; magnetic bearing plate 320; auxiliary magnetic guide plate 330; lifting assembly 400; drive assembly 410; transmission belt 411; transmission nut 420; lead screw 430; second base 500; fine adjustment module 600. Detailed Implementation

[0018] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0019] In the description of this invention, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] In the manufacturing and testing of printed circuit board assemblies (PCBAs), especially in precision electrical testing processes such as flying probe testing, the stable, reliable, and non-destructive fixation of the PCBA board is a crucial technological foundation. Traditional fixation methods mainly rely on mechanical clamping or vacuum adsorption. Mechanical clamping typically applies pressure from the board edge or specific points using screws or clamps. This method is prone to stress concentration, especially for thin PCBA boards or those with fragile components; excessive local pressure can directly lead to board bending, component damage, or solder joint cracking. Simultaneously, clamps and clamps may obstruct the testing area, restricting the probe's movement path. Vacuum adsorption relies on creating negative pressure under the PCBA board for fixation, requiring the board itself to have certain structural strength and airtightness. For PCBAs with porous, uneven, or flexible areas, the adsorption effect is significantly reduced, and fixation failure may even occur due to localized air leakage. Furthermore, continuous negative pressure adsorption may also generate uneven tensile stress on the board, posing a potential risk of deformation.

[0023] See Figures 1-2 To address the aforementioned problems, this application provides a magnetic adsorption lifting mechanism 100. This mechanism can be applied in the field of circuit board testing equipment technology, primarily for supporting, positioning, and transferring PCBA boards in the electronics manufacturing industry. This mechanism combines magnetic adsorption with mechanical lifting to achieve efficient and stable fixing and position adjustment of the PCBA board. Specifically, the magnetic adsorption lifting mechanism 100 includes a first base 200, a magnetic support 300, and a lifting assembly 400. The magnetic support 300 has a support surface 310 for supporting the PCBA board, and a top column 311 is provided on the support surface 310. The lifting assembly 400 is connected between the magnetic support 300 and the first base 200, and is used to drive the magnetic support 300 to rise and fall relative to the first base 200.

[0024] Specifically, in this embodiment, the magnetic adsorption lifting mechanism 100 includes a first base 200, a magnetic support 300, and a lifting assembly 400. The first base 200 serves as the basic support structure of the entire mechanism, providing a stable installation platform for the system. The magnetic support 300, as a functional component that directly contacts the PCBA board, can be used to place PCBA boards to be processed or tested. A flat bearing surface 310 is provided on the upper part of the magnetic support 300. It should be noted that when using the magnetic adsorption lifting mechanism 100, multiple top posts 311 are provided on the bearing surface 310. The top posts 311 can play a positioning and support role when carrying the PCBA board. For example, the top posts 311 can slightly lift the PCBA board, effectively preventing large-area contact between the board surface and the bearing surface 310, thus avoiding scratches and providing convenience for processes that require bottom space.

[0025] Furthermore, the lifting assembly 400 is connected between the magnetic support 300 and the first base 200, and is used to drive the magnetic support 300, enabling the lifting assembly 400 to move precisely and smoothly up or down relative to the first base 200. This lifting motion allows the PCBA board on the bearing surface 310 to be accurately transported to different working heights, thus flexibly adapting to subsequent processing, testing, or transfer processes. By setting a magnetic support 300 with magnetic adsorption function as the direct bearing component of the PCBA board, the evenly distributed surface adsorption force generated by it is used to fix the PCBA board. This method fundamentally replaces the traditional concentrated stress fixing methods that rely on screw fastening or clamp clamping. When the PCBA board is placed on the magnetic support 300, the magnetic force acts evenly on the bottom area of ​​the PCBA board, thereby avoiding the generation of local pressure points and effectively preventing bending, crushing, or damage to the PCBA board due to stress concentration during fixing and subsequent flying probe testing.

[0026] Furthermore, in this embodiment, a magnetic element 312 is provided at the bottom of the top post 311. The magnetic element 312 can be a permanent magnet, such as a neodymium iron boron magnet. The top post 311 provides a precise positioning point and stable mechanical support for the PCBA board supported above, ensuring the horizontal positioning accuracy of the PCBA board. Simultaneously, the magnetic element 312, located at the bottom of the top post, generates a strong and concentrated magnetic field. This magnetic field effectively passes through the top post 311 and the magnetic support base 300, acting on the PCBA board above. Sufficient adsorption force is generated for metal parts on the PCBA board, such as those without metal packages, metallized holes, or grounding layers. Through this structural arrangement, when the PCBA board is placed on the support surface 310, the top post 311 is firmly and uniformly adsorbed onto the preset positioning point by the vertically upward magnetic force emitted by the bottom magnetic element 312, avoiding the localized compressive stress caused by traditional clamps. Unlike the localized compressive stress caused by clamps in existing technologies, this fixing method can achieve stress-free and damage-free fixing. This advantage of magnetic lifting devices has more application scenarios, such as being applicable to high-density PCBA boards that are sensitive to physical stress.

[0027] Furthermore, there are multiple magnetic components 312, which are distributed in a ring around the top post 311. For example, the multiple magnetic components 312 can form a ring or matrix magnetic array. Specifically, the multiple magnetic components 312 generate a magnetic field from around the top post 311. These magnetic fields superimpose and merge to form a composite magnetic field that surrounds the top post 311 with a more uniform and stable intensity distribution. This ensures that the adsorption force acting on the PCBA board is balanced across the entire circumference of the top post 311, effectively avoiding localized minor warping or uneven stress on the PCBA board that may be caused by excessively strong or weak magnetic forces on one side. The magnetic lines of force generated by the multiple magnetic components 312 converge above the top post 311, increasing the total magnetic flux at that location. This significantly enhances the total adsorption force that a single top post 311 can provide, enabling more reliable fixation of larger or heavier PCBA boards.

[0028] See Figure 2The magnetic support base 300 includes a magnetic support plate 320 and an auxiliary magnetic guide plate 330 stacked together. The magnetic support plate 320 is in direct contact with the PCBA board, and its upper surface facing the PCBA board forms a flat support surface 310 for directly supporting the PCBA board. The magnetic support plate 320 can be made of a material with good magnetic permeability, such as low-carbon steel, which can not only effectively conduct magnetic force, but also has surface hardness and strength sufficient to support the top column 311 and withstand the weight and testing pressure of the PCBA board. The support surface 310 is located on the side of the magnetic support plate 320 opposite to the auxiliary magnetic guide plate 330. The lifting assembly 400 is connected to the magnetic support plate 320 or the auxiliary magnetic guide plate 330, with the auxiliary magnetic guide plate 330 attached to the underside of the magnetic support plate 320, serving as a guide and reinforcement component for the magnetic circuit. The auxiliary magnetic guide plate 330 can be made of a highly permeable magnetic material, capable of concentrating the magnetic lines of force emitted from the magnetic component 312 at the bottom of the top post 311, and guiding and diffusing these lines of force evenly onto the plane of the magnetic support plate 320. This significantly reduces magnetic field leakage and attenuation, allowing the support surface 310 to achieve a stronger and more uniformly distributed adsorption force, improving magnetic energy utilization and the fixation effect on the PCBA board. Furthermore, the lifting assembly 400 can be connected to either the magnetic support plate 320 or the auxiliary magnetic guide plate 330. This arrangement provides installation flexibility, ensuring that the entire magnetic support 300 maintains overall stability during lifting, preventing deformation due to force, and thus transmitting the lifting motion to the PCBA board above.

[0029] In one embodiment, the magnetic adsorption lifting mechanism 100 further includes a second base 500 and a fine-tuning module 600. The second base 500 serves as the mounting base for the lower level and is fixed to the equipment platform or the ground, providing a stable reference plane for all components above. The fine-tuning module 600 is connected between the first base 200 and the second base 500 and can adjust the spatial position of the first base 200 relative to the second base 500, for example, to adjust the tilt of the first base 200 relative to the second base 500. By operating the fine-tuning module 600, the relative height of the first base 200 and the second base 500 at a specific corner or side can be changed, allowing the operator to correct the levelness of the first base 200. Since the lifting assembly 400, the magnetic support 300, and the PCBA board are all supported on the first base 200, adjusting the tilt of the first base 200 is essentially calibrating the levelness of the PCBA board's supporting plane.

[0030] Furthermore, the fine-tuning module 600 includes a first connector, a second connector, and a screw. The first connector is fixedly installed at a corresponding position on the first base 200, and the second connector is fixedly installed at a corresponding position on the second base 500, spatially corresponding to the first connector. The screw, as an adjusting element, is assembled between the first and second connectors. The screw typically passes through a threaded hole on one connector and its end abuts against or acts on the other connector. During operation, by tightening the screw, the depth of screw insertion can be changed, directly acting between the first and second connectors, thereby dynamically adjusting the gap between them. Since the first and second connectors are fixed to the first base 200 and the second base 500 respectively, it should be noted that when the gap is changed by tightening the screw, the relative height between the first base 200 and the second base 500 is actually locally changed. By setting the fine-tuning module 600 on the first base 200 and coordinating its adjustment, the tilt of the first base 200 relative to the second base 500 can be adjusted, ultimately ensuring the level of the supporting platform.

[0031] In one embodiment, the first base 200 has a rectangular structure, which facilitates processing and installation and provides a clear and symmetrical adjustment reference. Fine-tuning modules 600 are provided on at least two opposite sides of the first base 200. By adjusting independently on opposite sides, the operator can specifically correct the tilt of the first base 200 around its central axis. For example, by adjusting the left and right fine-tuning modules 600, the horizontal deviation of the base in the left-right direction can be precisely corrected; similarly, if fine-tuning modules 600 are also provided on the front and rear sides, independent control of the tilt angle in the front-rear direction can be achieved. Conversely, if the fine-tuning modules 600 are only arranged on one side or in an asymmetrical position, uncontrollable twisting or new imbalances can easily be introduced during leveling. Supporting and leveling the base from at least two opposite sides is equivalent to providing a defined and stable reference plane for the upper mechanism, effectively preventing deformation of the base due to cantilever or uneven force, and ensuring the long-term working stability of the lifting assembly 400 and the magnetic support 300 after leveling.

[0032] Further, in one embodiment, the lifting assembly 400 includes a drive assembly 410, a transmission nut 420, and a lead screw 430. The lead screw 430 is capable of linear motion, and one end of the lead screw 430 is fixed to the magnetic support base 300, so that the up-and-down movement of the lead screw 430 can be directly transmitted to the magnetic support base 300, thereby driving the PCBA board on it to rise and fall together. The drive assembly 410 is disposed on the first base 200 and is responsible for providing the initial power, typically including drive components such as a motor. The transmission nut 420 has threads internally machined to match the lead screw 430 and is connected to the first base 200. The transmission nut 420 itself can rotate freely under the support of the first base 200, but its axial position is fixed. In terms of transmission relationship, the drive assembly 410, the transmission nut 420, and the lead screw 430 are sequentially connected. In use, after the drive assembly 410 is started, it transmits the rotational power it generates to the transmission nut 420, driving the transmission nut 420 to rotate in place. Since the axial position of the transmission nut 420 is limited by the first base 200, and the lead screw 430 is engaged with the rotating transmission nut 420 through a threaded pair, and the upper end of the lead screw 430 is fixed to the magnetic support seat 300, when the transmission nut 420 rotates, the lead screw 430 moves linearly relative to the nut, thereby realizing the vertical lifting and lowering of the lead screw 430 and the magnetic support seat 300 fixed thereto.

[0033] In one embodiment, the lead screw 430 is suspended at one end away from the magnetic support 300 and passing through the transmission nut 420. This eliminates errors and ensures smooth operation of the equipment. Specifically, during installation and operation, there may be a small, unavoidable alignment error between the axis of the lead screw 430 and the axis of the transmission nut 420. If the bottom end of the lead screw 430 is forcibly fixed and supported, the error will be amplified along the entire length of the lead screw 430, transforming into internal stress and causing abnormal wear of the transmission. The suspended design provides the lead screw 430 with a small adaptive adjustment space, allowing it to automatically find a smooth transmission path under the constraint of the nut, compensating for the alignment error. By avoiding rigid constraints at the end and the resulting forced displacement, additional bending stress is avoided.

[0034] In one embodiment, the drive assembly 410 includes a drive motor and a transmission belt 411. Multiple transmission nuts 420 and lead screws 430 are present and correspond one-to-one. The drive motor is driven by the transmission belt 411, and the transmission belt 411 is driven by each transmission nut 420. When the drive motor starts, the rotational power is synchronously transmitted to the transmission nuts 420 through the transmission belt 411, enabling each transmission nut 420 to rotate at the same speed and direction. This drives the corresponding lead screw 430 to achieve synchronous linear motion. This arrangement ensures that each support point of the magnetic support 300 receives consistent lifting force and displacement, ultimately achieving smooth, tilt-free vertical lifting of the entire support.

[0035] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A magnetic adsorption type lifting mechanism, characterized by, The application relates to a magnetic bearing base, which comprises a first base, a magnetic bearing base and a lifting assembly, wherein the magnetic bearing base has a bearing surface for bearing a PCBA board, a top column is arranged on the bearing surface, the lifting assembly is connected between the magnetic bearing base and the first base, and the lifting assembly is used for driving the magnetic bearing base to lift relative to the first base.

2. The magnetic levitation mechanism according to claim 1, wherein The bottom of the top column is provided with a magnetic part.

3. The magnetic levitation mechanism according to claim 2, wherein The number of the magnetic parts is multiple, and the multiple magnetic parts are arranged around the top column.

4. The magnetic levitation mechanism according to claim 1, wherein The magnetic bearing base comprises a magnetic bearing plate and an auxiliary magnetic guide plate arranged in layers, the bearing surface is located on the side of the magnetic bearing plate away from the auxiliary magnetic guide plate, and the lifting assembly is connected to the magnetic bearing plate or the auxiliary magnetic guide plate.

5. The magnetic levitation mechanism according to claim 1, wherein The application further comprises a second base and a fine adjustment module, the fine adjustment module is connected between the first base and the second base, and the fine adjustment module is used for adjusting the inclination between the first base and the second base.

6. The magnetic levitation mechanism according to claim 5, wherein The fine adjustment module comprises a first connecting part, a second connecting part and a screw, the first connecting part is fixed to the first base, the second connecting part is fixed to the second base, the screw is assembled between the first connecting part and the second connecting part, and the screw is used for adjusting the gap between the first connecting part and the second connecting part.

7. The magnetic levitation mechanism according to claim 5, wherein The first base has a rectangular structure, and at least two opposite sides of the first base are provided with the fine adjustment module.

8. The magnetic levitation mechanism according to claim 5, wherein The lifting assembly comprises a driving assembly, a transmission nut and a lead screw, one end of the lead screw is fixed to the magnetic bearing base, the driving assembly is arranged on the first base, the transmission nut is rotationally connected to the first base, and the driving assembly, the transmission nut and the lead screw are sequentially transmissionally connected.

9. The magnetic levitation mechanism according to claim 8, wherein The end of the lead screw away from the magnetic bearing base is suspended through the transmission nut.

10. The magnetic levitation mechanism of claim 5, wherein, The driving assembly comprises a driving motor and a transmission belt, the number of the transmission nut and the lead screw is multiple and one-to-one corresponding, the driving motor is transmissionally connected with the transmission belt, and the transmission belt is transmissionally connected with each transmission nut.

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