A segmented positioning mechanism

Abstract

The utility model discloses a segmented positioning mechanism, include: base, first positioning part, fixedly connected in the end of base, second positioning part, the sleeve of setting on base can move along the direction of approaching or away from first positioning part relative to base, wherein: the outer contour size of second positioning part is configured to cooperate with the positioning hole inner diameter of the workpiece to be positioned, the center circle diameter of first positioning part is less than the outer contour size of second positioning part, and second positioning part can be set in first positioning part outside. The segmented positioning mechanism of the utility model can realize easy pre-centering through the fixed small diameter first positioning part, and then the second positioning part of axial movement, precision matching is nested to complete the final high-precision positioning without gap, thereby ensuring the operation convenience, and realizing the stable and reliable precision positioning effect.

Description

Technical Field

[0001] This utility model relates to the field of assembly positioning technology, and in particular to a segmented positioning mechanism. Background Technology

[0002] In the field of precision manufacturing and testing, rapid and accurate workpiece positioning is a crucial step in ensuring production efficiency and product quality. Taking the fit between the testing machine and the stiffener carrying the chip in semiconductor testing as an example, the industry-standard positioning solution is to use the positioning pins on the testing machine to fit the positioning sleeves on the stiffener. This method is intuitive in principle and simple in structure. However, a fundamental contradiction that has long plagued engineers has not been effectively resolved: to ensure that the workpiece (such as the stiffener) can be easily and smoothly placed in, avoiding bumps and damage, a certain gap needs to be maintained between the positioning pin and the positioning sleeve. This is called the tolerance space required in the pre-fitting stage. However, it is precisely this necessary gap that causes the workpiece to still wobble slightly within the gap range when it needs to be locked or subjected to precision testing, making it impossible to achieve truly zero-error precise positioning. Conversely, if the pin and sleeve are designed to have an interference fit or zero clearance fit in pursuit of final positioning accuracy, the initial placement action will be extremely difficult, and forced insertion can easily damage the precision workpiece or the positioning element itself, making it equally impractical.

[0003] Existing technologies attempt to alleviate initial insertion difficulties by designing chamfers or guide cones at the head of the pin. However, this only improves the entry experience and does not change the gap contradiction between the mating replicas. The final positioning accuracy still depends on the mating gap with play. Therefore, how to provide sufficient tolerance in the initial stage for easy pre-placement and achieve gapless rigid precision positioning in the final stage in the same positioning process has become a technical bottleneck that urgently needs to be overcome. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the contradiction in the existing technology that a single pin sleeve fit cannot simultaneously take into account the loose tolerance of the initial pre-fit and the rigidity of the final precise positioning. It provides a segmented positioning mechanism that can easily pre-align by using a fixed small-diameter first positioning member, and then complete the final high-precision positioning without gaps by nesting a second positioning member that can move axially and match precisely. Thus, while ensuring convenient operation, it achieves a stable and reliable precision positioning effect.

[0005] To solve the above-mentioned technical problems, this utility model provides a segmented positioning mechanism, comprising: Base; The first positioning element is fixedly connected to the end of the base; The second positioning element is sleeved on the base and can move relative to the base in a direction that is closer to or farther from the first positioning element. Wherein: the outer contour dimension of the second positioning member is configured to match the inner diameter of the positioning hole of the workpiece to be positioned, the central circle diameter of the first positioning member is smaller than the outer contour dimension of the second positioning member, and the second positioning member can be fitted over the first positioning member.

[0006] In one embodiment of the present invention, a substrate is further included, and the base is fixedly mounted on the substrate.

[0007] In one embodiment of the present invention, a plurality of bases are provided on the substrate.

[0008] In one embodiment of this utility model, a lifting plate is further included, the second positioning member is connected to the lifting plate, and the lifting plate drives the second positioning member to move.

[0009] In one embodiment of this utility model, the outer periphery of the first positioning member and the second positioning member are provided with a plurality of arc-shaped guide portions distributed circumferentially, and the nested connection of the first positioning member and the second positioning member is realized through the arc-shaped guide portions.

[0010] In one embodiment of the present invention, the outer periphery of the first positioning member is provided with a plurality of arc-shaped guide blocks that are spaced apart circumferentially and protrude outward, and the outer periphery of the second positioning member is provided with a plurality of arc-shaped guide grooves that are spaced apart circumferentially and recessed inward, and the arc-shaped guide blocks can be inserted into the arc-shaped guide grooves.

[0011] In one embodiment of the present invention, the arc-shaped guide portion is evenly distributed circumferentially on the outer periphery of the first positioning member and the second positioning member.

[0012] In one embodiment of the present invention, a guide portion is provided on the base, and the second positioning member is slidably connected to the base through the guide portion.

[0013] In one embodiment of the present invention, the difference between the central circle diameter of the first positioning member and the outer contour dimension of the second positioning member is configured to be equal to the radial movement clearance required by the workpiece to be positioned in the initial positioning stage.

[0014] In one embodiment of this utility model, the segmented positioning mechanism is used for positioning and coordinating the testing machine with the reinforcing plate.

[0015] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: The segmented positioning mechanism described in this utility model, by setting the key dimensional feature that the diameter of the center circle of the first positioning component is smaller than the outer contour dimension of the second positioning component, allows the workpiece to swing around the smaller center circle of the first positioning component during initial placement, automatically finding a roughly centered position. This directly achieves the beneficial effects of easy operation and high fault tolerance in the pre-fitting stage, fundamentally avoiding placement difficulties or workpiece damage caused by excessively tight fit.

[0016] Secondly, by adopting a structure in which the second positioning element can be fitted outside the first positioning element and can move relative to it, after the pre-alignment is completed, the precisely matched second positioning element can be guided axially by the first positioning element, move smoothly forward, and finally fit tightly with the workpiece. Because the precise second positioning element completely replaces the traditional positioning pin with gaps, it assumes the final rigid positioning role, thereby achieving the effect of high final positioning accuracy and no backlash or wobbling.

[0017] Furthermore, the entire mechanism achieves a two-stage positioning process driven by a single action through a simple combination of a fixed first positioning component and a movable second positioning component on the base. The mechanism has a simple structure, reliable operation, and does not require complex sensing and feedback control. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is an exploded structural diagram of the segmented positioning mechanism of this utility model; Figure 2 This is a schematic diagram of the overall structure of the segmented positioning mechanism of this utility model; Figure 3 This is a schematic diagram of the structure of the second positioning member of this utility model nested after the first positioning member; Figure 4 This is a schematic diagram of the structure of the segmented positioning mechanism of this utility model after the base plate and reinforcing plate are transferred.

[0019] Explanation of reference numerals in the accompanying drawings: 1. Base; 2. First positioning element; 21. Center circle; 22. Arc-shaped guide block; 3. Second positioning element; 31. Arc-shaped guide groove; 4. Base plate; 5. Lifting plate. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0021] Reference Figures 1-3As shown, this utility model discloses a segmented positioning mechanism that abandons the traditional single pin-and-sleeve fit and instead adopts a set of inner and outer double-ring, dynamic and static combined collaborative positioning mechanisms. It includes: a fixed base 1, on which a first positioning element 2 with a smaller central circle 21 is connected, and a second positioning element 3 that can move axially along the base 1 and whose outer contour precisely matches the workpiece positioning hole. In the initial pre-fitting stage, the workpiece first fits its positioning hole into the central circle 21 of the first positioning element 2. Because the diameter of this central circle 21 is intentionally designed to be smaller than the fit size of the workpiece positioning hole and the second positioning element 3, the workpiece obtains ample circumferential movement, limited by the outer edge of the first positioning element 2, thus allowing it to fall easily and unimpeded and achieve initial centering, perfectly solving the problem of not being able to fit or having difficulty fitting in. At this time, the second positioning element 3 is in its initial position, behind the first positioning element 2, and does not interfere with this pre-positioning process.

[0022] After the workpiece is initially placed, the second positioning component 3 is driven forward, gradually bringing its precise outer contour into the workpiece's positioning hole. Because the dimensions of the second positioning component 3 are designed for an interference or zero-clearance fit with the workpiece's positioning hole, as it advances, the workpiece is gradually corrected and ultimately tightly secured to the second positioning component 3, achieving extremely high final positioning accuracy and completely eliminating wobbling caused by clearance. Crucially, the second positioning component 3 is nested outside the first positioning component 2 during movement. This nested relationship ensures that during fine positioning, the second positioning component 3 can use the initial alignment position of the first positioning component 2 as a reference for final correction, rather than searching for the center again in an empty space. The small center circle 21 of the first positioning component 2 acts as a wide guiding channel, while the second positioning component 3 acts as a precise locking pin at the end of the channel. Functionally, they work in segments, and structurally, they are nested and coordinated.

[0023] The segmented positioning mechanism in this embodiment fundamentally resolves the inherent contradiction between loose pre-fit and precise final fit, ensuring that high-precision positioning does not come at the expense of operational convenience. In practical use, the entire positioning process is smooth and reliable, requiring no complex visual assistance or highly skilled operation, thus reducing operational difficulty and operator requirements. Furthermore, due to its segmented mechanical structure, it boasts high reliability and durability, eliminating the need for complex electronic sensors or closed-loop control, achieving automated integration while maintaining system robustness and low maintenance costs. This provides a simple and efficient solution for automated equipment, testing fixtures, and precision assembly lines requiring high-precision, repeatable positioning.

[0024] Reference Figure 4As shown, when implementing the segmented positioning mechanism of this utility model, a base plate 4 can be added to the base 1. This base plate 4 serves as a larger mounting platform, providing a stable reference plane and convenient installation interface for the entire positioning mechanism. The base 1 is fixedly mounted on this base plate 4, ensuring the overall rigidity and positional accuracy of the positioning mechanism in the equipment, facilitating modular installation and replacement in the production line or testing machine. Multiple bases 1 are provided on the base plate 4, enabling multi-point positioning.

[0025] Specifically, in the embodiment of driving the movement of the second positioning element 3, a preferred solution is to introduce a lifting plate 5, fix the second positioning element 3 to this lifting plate 5, and drive the lifting plate 5 as a whole to move linearly through an external driving device (such as a cylinder, motor, etc.), thereby driving all the second positioning elements 3 connected to it to move synchronously. This centralized driving method not only simplifies the transmission structure and reduces the control complexity, but also ensures a high degree of consistency in the movements of multiple second positioning elements 3, making it an effective technical means to achieve synchronous and precise locking of batch workpieces.

[0026] To achieve the nested engagement of the first positioning element 2 and the second positioning element 3, multiple circumferentially spaced arc-shaped guide portions can be added to the outer periphery of each of the first positioning element 2 and the second positioning element 3. These arc-shaped guide portions constitute the specific structure for achieving the nested connection between the two. During operation, even if the center circle 21 of the first positioning element 2 provides initial alignment, these circumferentially distributed guide portions can provide additional radial guidance and constraint as the second positioning element 3 moves closer, preventing circumferential displacement of the workpiece before final locking. This allows the second positioning element 3 to be more smoothly and accurately fitted into the predetermined position centered on the first positioning element 2.

[0027] As a specific and efficient implementation of the aforementioned guiding part, the guiding part of the first positioning member 2 can be designed as an outwardly protruding arc-shaped guiding block 22, while the corresponding part of the second positioning member 3 can be designed as an inwardly recessed arc-shaped guiding groove 31. In the final stage of the second positioning member 3 moving closer to the first positioning member 2, these protruding arc-shaped guiding blocks 22 can be precisely inserted into the corresponding arc-shaped guiding grooves 31. This convex-concave mating not only achieves physical nesting and interlacing, effectively preventing relative rotation, but also provides a precise secondary correction opportunity at the microscopic level, further eliminating possible minor alignment errors, thereby achieving extremely high final coaxiality and positioning repeatability. In other embodiments, other nesting methods can also be used.

[0028] To ensure uniformity and balance of guiding force, the arc-shaped guide parts are preferably evenly distributed circumferentially along the outer periphery of the first positioning member 2 and the second positioning member 3. This even distribution ensures that the guiding and constraint forces from all directions are balanced, preventing workpiece skewing or positioning member jamming due to uneven force distribution. For example, using three evenly distributed guide parts can form a stable constraint state where three points define a circle, which is crucial for ensuring the stability and prevents drift of the workpiece center during positioning.

[0029] To ensure the linearity and smoothness of the movement of the second positioning element 3, a dedicated guide portion can be provided on the base 1. The second positioning element 3 forms a sliding connection with the base 1 through this guide portion, for example, by using a combination of a guide rod and a linear bearing, or a structure of a precision guide groove and a slider. This technical means strictly restricts the movement of the second positioning element 3 to a preset axis, eliminating the possibility of wobbling or swaying, thereby accurately converting the thrust of the drive device into axial positioning and clamping force. This is the physical basis for achieving high-precision and high-repeatability final positioning.

[0030] In terms of dimensional design, a key implementation point of this embodiment lies in precisely controlling the difference between the diameter of the center circle 21 of the first positioning member 2 and the outer contour dimension of the second positioning member 3. This difference is not arbitrarily set, but is purposefully configured to be equal to the specific radial movement clearance required by the workpiece to be positioned in the initial positioning stage. This technical feature is directly related to structural dimensions and functional requirements: the clearance ensures that the workpiece can be fitted onto the first positioning member 2 without resistance, completing rapid pre-positioning; its size is also precisely calculated to accommodate the offset of the workpiece caused by manufacturing tolerances or posture fine-tuning, but it is not too large, which would cause the correction stroke to be too long or fail during subsequent fine positioning. This reflects the quantitative solution of the contradiction between tolerance and precision in this embodiment from the principle.

[0031] It should be noted that a typical and important application of the segmented positioning mechanism in this embodiment is for the positioning and engagement of the testing machine and the stiffener. In this specific application scenario, the workpiece to be positioned is the stiffener with positioning holes. Through the combination of the above-mentioned technical features, this mechanism can perfectly solve a long-standing problem in the field of testing machines: when placing the expensive chip carrier board into the testing stage, it protects it from collision damage (through loose initial positioning) and ensures absolutely accurate and reliable circuit connections during testing (through gapless final positioning). This fully demonstrates that the segmented positioning mechanism of this embodiment has extremely high practical value and broad prospects for promotion in the field of high-end manufacturing and testing.

[0032] 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 protection scope of this invention.

Claims

1. A segmented positioning mechanism, characterized in that, include: Base; The first positioning element is fixedly connected to the end of the base; The second positioning element is sleeved on the base and can move relative to the base in a direction that is closer to or farther from the first positioning element. Wherein: the outer contour dimension of the second positioning member is configured to match the inner diameter of the positioning hole of the workpiece to be positioned, the central circle diameter of the first positioning member is smaller than the outer contour dimension of the second positioning member, and the second positioning member can be fitted over the first positioning member.

2. The segmented positioning mechanism according to claim 1, characterized in that: It also includes a substrate, and the base is fixedly mounted on the substrate.

3. The segmented positioning mechanism according to claim 2, characterized in that: The substrate is provided with a plurality of the bases.

4. The segmented positioning mechanism according to claim 1, characterized in that: It also includes a lifting plate, the second positioning member is connected to the lifting plate, and the lifting plate drives the second positioning member to move.

5. The segmented positioning mechanism according to claim 1, characterized in that: The first positioning member and the second positioning member each have multiple arc-shaped guide parts distributed circumferentially at intervals on their outer periphery, and the first positioning member and the second positioning member are nested and connected through the arc-shaped guide parts.

6. The segmented positioning mechanism according to claim 5, characterized in that: The outer periphery of the first positioning member is provided with a plurality of arc-shaped guide blocks that are spaced apart circumferentially and protrude outwards, and the outer periphery of the second positioning member is provided with a plurality of arc-shaped guide grooves that are spaced apart circumferentially and recessed inwards, and the arc-shaped guide blocks can be inserted into the arc-shaped guide grooves.

7. The segmented positioning mechanism according to claim 5, characterized in that: The arc-shaped guide portion is evenly distributed circumferentially on the outer periphery of the first and second positioning members.

8. The segmented positioning mechanism according to claim 1, characterized in that: The base is provided with a guide portion, and the second positioning member is slidably connected to the base through the guide portion.

9. The segmented positioning mechanism according to claim 1, characterized in that: The difference between the center circle diameter of the first positioning member and the outer contour dimension of the second positioning member is configured to be equal to the radial clearance required by the workpiece to be positioned in the initial positioning stage.

10. The segmented positioning mechanism according to claim 1, characterized in that: The segmented positioning mechanism is used for positioning and coordinating the testing machine with the reinforcing plate.

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