A hinge automatic assembling device's buckle positioning assembly

Abstract

The utility model provides a kind of fastening and positioning subassembly of hinge automatic assembly device, belong to equipment technical field, the fastening and positioning subassembly of this hinge automatic assembly device includes positioning support, sliding fastening arm and accurate limiting column;Positioning support has rectangular bottom surface, and the two sides of positioning support are provided with the guide groove of mutual parallel along longitudinal extension;Sliding fastening arm has the clamping end for clamping hinge blade, and the two sides of sliding fastening arm are respectively with the guide groove of positioning support cooperation, for supporting sliding fastening arm along the extension direction of guide groove sliding;Accurate limiting column is connected with positioning support by screw thread, and the free end of accurate limiting column is inserted into the sliding region of sliding fastening arm, for abutting hinge blade, to realize the initial position presetting and fastening of hinge blade;The utility model can solve the problem that lack a kind of accurate pre-positioning and fastening mechanism capable of bearing high-frequency assembly action.

Description

Technical Field

[0001] This utility model belongs to the field of assembly equipment technology, and more specifically, relates to a fastening and positioning component of an automatic hinge assembly device. Background Technology

[0002] In modern industrial manufacturing, hinges, as a commonly used connection and rotation mechanism, are widely used in furniture, home appliances, automobiles, precision instruments, and electronic equipment. With the accelerating pace of product iteration and ever-increasing demands for manufacturing precision, the automated assembly of hinges faces greater challenges. Existing automated hinge assembly technologies typically rely on two or more clamping systems to grip two hinge blades, and then an external drive mechanism (such as a cylinder or servo motor) drives one blade towards the other to achieve final alignment. However, in high-speed, high-frequency automated assembly environments, this existing technology has several inherent drawbacks. For example, the endpoint positioning accuracy of cylinder-driven systems highly depends on mechanical hard limit blocks, but these limit blocks are prone to wear and lack fine-tuning compensation capabilities. Secondly, at the moment the two hinge blades approach and are ready to engage, the geometric tolerances of the blades themselves, the repeatability errors of the clamping systems, and the accumulation of minute vibrations during the movement can cause micron-level axial or radial deviations in the pin hole positions on the blades. These minute deviations are the main cause of difficulties in pin insertion and even damage to the blades or pins during subsequent automated hinge pin insertion operations. To address this issue, existing technologies have had to introduce expensive industrial vision systems for real-time position correction or employ high-precision, low-speed servo drive systems, which significantly increases equipment complexity, manufacturing costs, and cycle time. Therefore, the existing methods of hinge engagement, which commonly rely on independent clamping and coarse endpoint positioning, are no longer sufficient to meet the demands of modern precision manufacturing for high-efficiency, high-precision, and high-reliability automated assembly. Utility Model Content

[0003] In view of this, the present invention provides a latching and positioning component for an automatic hinge assembly device, which can solve the technical problem in the prior art of lacking a precise pre-positioning and latching mechanism that can provide high precision, high rigidity and withstand high frequency assembly actions.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a snap-fit ​​positioning component for an automatic hinge assembly device, used to precisely position and snap-fit ​​two hinge blades during the assembly process. The component includes a positioning bracket, a sliding snap-fit ​​arm, and a precision limiting post. The positioning bracket has a rectangular bottom surface, and parallel guide grooves are provided on both sides extending longitudinally. The sliding snap-fit ​​arm has a clamping end for holding the hinge blades, and its two sides respectively cooperate with the guide grooves of the positioning bracket to support the sliding of the sliding snap-fit ​​arm along the extension direction of the guide grooves. The precision limiting post is threadedly connected to the positioning bracket, and its free end extends into the sliding area of ​​the sliding snap-fit ​​arm to abut against the hinge blades, thereby achieving initial position preset and snap-fit ​​of the hinge blades.

[0006] The technical advantages of the snap-fit ​​positioning component of the automatic hinge assembly device provided by this utility model are as follows: The synergistic action of the positioning bracket, the sliding snap-fit ​​arm, and the precision limiting post constitutes a high-rigidity, high-precision pre-positioning and pushing mechanism for the hinge blades before snap-fitting. The positioning bracket provides a stable installation benchmark and a precise guide frame for the entire component; the sliding snap-fit ​​arm utilizes its cooperation with the guide groove to achieve smooth, linear movement, applying snap-fit ​​thrust to the hinge blades; the precision limiting post serves as an absolute position reference point, continuously abutting against the hinge blades before and during the application of thrust by the sliding snap-fit ​​arm, precisely limiting the initial position of the hinge blades and preventing minute axial or radial displacements at the moment of snap-fitting, thereby fundamentally ensuring the alignment accuracy of the hinge blades during snap-fitting, significantly improving the success rate of hinge pin insertion and the efficiency of automated assembly. The snap-fit ​​positioning component avoids reliance on complex electronic or vision systems for position correction, achieving high-precision positioning through a purely mechanical method.

[0007] Based on the above technical solution, the latching and positioning component of the automatic hinge assembly device of this utility model can be further improved as follows:

[0008] The sliding fastening arm includes two guide flanges for insertion into the guide groove. The lateral width of the two guide flanges is precisely matched with the lateral width of the guide groove to eliminate the gap movement of the sliding fastening arm in the lateral direction.

[0009] The beneficial effects of the above-mentioned improvement scheme are as follows: the two guide flanges on the sliding engagement arm and the guide groove on the positioning bracket adopt a precisely matched lateral width fit to eliminate any lateral clearance movement or wobbling that may occur during the sliding of the sliding engagement arm. This precisely matched fit ensures that when the engagement force is applied, the direction of the force is strictly consistent with the extension direction of the guide groove, avoiding deflection of the sliding engagement arm due to lateral clearance. This guarantees the straightness of the engagement and the stability of the force, further improving the accuracy of the hinge blade alignment and the reliability of the engagement process.

[0010] Furthermore, a V-shaped groove is provided on the side of the clamping end of the sliding fastening arm facing the precision limiting post. The geometric center line of the V-shaped groove is parallel to the sliding direction of the sliding fastening arm, which is used to adaptively center the cylindrical feature of the hinge blade.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the V-shaped groove has a self-centering function. When the sliding engagement arm slides forward and approaches the hinge blade, the V-shaped groove is used to automatically capture and center the cylindrical feature of the hinge blade, thereby performing secondary precise positioning of the hinge blade before applying thrust. The V-shaped groove and the precision limiting post work together to form a double positioning constraint, which further optimizes the radial positioning accuracy of the hinge blade and reduces the requirements for external feeding accuracy.

[0012] Furthermore, the precision positioning post adopts a stepped cylindrical structure, and a stop is formed between the two cylindrical segments with different diameters of the stepped cylindrical structure. The stop is used to tightly fit the end face of the threaded hole on the positioning bracket for installing the precision positioning post.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Through the stepped cylindrical structure and the stop between the cylindrical segments, it is ensured that when the precision locating post is threaded onto the positioning bracket, the stop and the end face of the threaded hole are tightly fitted. This tight fit provides an absolute axial reference, and the extension length of the precision locating post no longer depends solely on the depth of thread insertion. The rigid contact between the stop and the end face ensures that the axial position of the precision locating post will not experience any slight compression or loosening when subjected to the reaction force of the engagement thrust, significantly improving the rigidity of the positioning reference point and the accuracy of long-term repeated positioning.

[0014] Furthermore, the positioning bracket has a U-shaped cross-section structure, with guide grooves on the two vertical walls on the outer side of the U-shaped structure, and threaded holes at the bottom of the U-shaped structure for installing precision positioning pins.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the U-shaped structure design provides the necessary structural rigidity with minimal material consumption, especially the vertical walls on both sides which support the guide grooves, ensuring the parallelism and perpendicularity of the guide grooves. The outer wall of the U-shaped structure is used to withstand the reaction force generated by the sliding locking arm during locking. The structure has high rigidity and occupies relatively compact space. The bottom of the U-shaped structure is used to install precise limiting posts. The overall design achieves the integration and high performance of positioning, guiding and supporting functions.

[0016] Furthermore, the length of the precision limiting post extending toward the sliding engagement arm is greater than the width of the clamping end of the sliding engagement arm along the sliding direction, in order to ensure that the precision limiting post remains in contact before the hinge blade is fully engaged.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The above-mentioned configuration ensures that the free end of the precision limiting post remains in contact with the hinge blade throughout the entire engagement stroke of the sliding engagement arm. This continuous contact ensures that the precision limiting post still provides rigid support at the moment the engagement arm pushes the hinge blade for final alignment and engagement, effectively preventing the hinge blade from vibrating or shifting due to inertia or thrust imbalance, thus guaranteeing the dynamic stability of the engagement process.

[0018] Furthermore, the free end of the precision limiting post is machined into a chamfered frustum shape, with the small-diameter end of the chamfered frustum facing the hinge blade, in order to reduce the contact resistance between the hinge blade and the precision limiting post during the positioning process.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the above settings are used to minimize the contact area between the precision limiting post and the hinge blade. Minimizing the contact area reduces the frictional resistance between the hinge blade and the precision limiting post during positioning and sliding. At the same time, the chamfered shape has a certain guiding effect, which helps to assist the initial centering of the hinge blade. The design helps to protect the surface of the hinge blade from scratches and extends the service life of the precision limiting post.

[0020] Furthermore, a dovetail groove is provided on the inner side of the guide flange of the sliding fastening arm along the length direction, and a dovetail protrusion is provided on the inner side wall of the guide groove of the positioning bracket. The dovetail groove and the dovetail protrusion cooperate to provide anti-lifting limit when the sliding fastening arm slides.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the dovetail groove and dovetail protrusion cooperate to provide a rigid interlock in the vertical direction when the sliding engagement arm slides. The interlock structure is used to completely suppress the lifting tendency or overturning moment of the sliding engagement arm caused by uneven force when it is subjected to forward engagement thrust and backward reaction force, ensuring that the engagement arm moves stably and rigidly in the same plane throughout the entire engagement stroke.

[0022] Furthermore, the chamfered frustum shape of the precision positioning post is made of zirconia ceramic material, which is used to provide high hardness and low coefficient of friction.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By selecting zirconia ceramic material, which has extremely high hardness and excellent wear resistance, it is ensured that it can effectively resist wear and scratches when in contact with the hinge blade. In addition, zirconia ceramic material has a low coefficient of friction. The low coefficient of friction is used to minimize contact resistance when the hinge blade is pushed and slides along the surface of the precision locating post. The material selection ensures the positioning accuracy and service life of the precision locating post during high-frequency and long-term operation on automated production lines.

[0024] Furthermore, both the positioning bracket and the sliding locking arm are made of high-strength aluminum alloy, which is used to ensure the structural rigidity and lightweight of the locking and positioning assembly.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by selecting high-strength aluminum alloy material, it has high strength and excellent rigidity; it ensures that the structure of the fastening and positioning component does not undergo elastic or plastic deformation when subjected to high-frequency impact loads and fastening thrusts during automated assembly, thus guaranteeing the rigidity of the positioning and fastening action; at the same time, it achieves a lightweight design of the fastening and positioning component, which is conducive to improving the motion response speed and energy efficiency of the entire assembly equipment.

[0026] Compared with existing technologies, the beneficial effects of the latching and positioning component of the automatic hinge assembly device provided by this utility model are as follows: By employing three core mechanical components—a positioning bracket, a sliding latching arm, and a precision limiting post—it achieves high-precision, high-rigidity pre-positioning and latching functions in a purely mechanical manner, successfully solving the technical problems of low assembly success rate caused by insufficient positioning rigidity, gap wobble, and inaccurate positioning reference in existing automated hinge assembly equipment. The positioning bracket adopts a U-shaped cross-section and high-strength aluminum alloy material, ensuring the stability and rigidity of the entire component. The sliding latching arm, through the precise matching of its guide flange and guide groove, and the interlocking cooperation of the dovetail groove and dovetail protrusion, ensures smooth linear movement of the latching arm without lateral or vertical gaps throughout the entire pushing and closing process, eliminating vibration and offset during the movement. The precision limiting post adopts a stepped cylindrical structure and a stop design, and its free end, made of wear-resistant zirconia ceramic material with a chamfered frustum shape, provides an absolutely rigid, low-friction, and precisely adjustable pre-positioning reference point. The structural dimension of the precise limiting post extending beyond the width of the sliding engagement arm's clamping end ensures that it provides continuous rigid support throughout the entire engagement stroke of the hinge blade. The structural design of the engagement positioning assembly guarantees, in principle, that the relative positional accuracy of the hinge blade before final engagement can be strictly controlled at the micrometer level, thereby significantly improving the insertion efficiency of the hinge pin and the finished product yield. This invention does not rely on any complex electronic control or visual feedback system, and boasts outstanding advantages such as simple structure, easy manufacturing, low cost, convenient maintenance, and high long-term reliability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the fastening and positioning component of an automatic hinge assembly device;

[0029] Figure 2 A top view of the fastening and positioning component of an automatic hinge assembly device;

[0030] Figure 3 A cross-sectional view of the fastening and positioning component of an automatic hinge assembly device;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Positioning bracket; 11. Sliding locking arm; 12. Precision limiting post; 13. Guide groove; 14. Clamping end; 15. Guide flange; 16. Stop. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The diagram shows an embodiment of the latching and positioning component of an automatic hinge assembly device provided by this utility model. In this embodiment, it is used to precisely position and latch the two hinge blades of the hinge during the assembly process. The component includes a positioning bracket 10, a sliding latching arm 11, and a precision limiting post 12. The positioning bracket has a rectangular bottom surface, and parallel guide grooves 13 extend longitudinally from both sides of the positioning bracket. The sliding latching arm has a clamping end 14 for clamping the hinge blades, and its two sides respectively cooperate with the guide grooves of the positioning bracket to support the sliding of the sliding latching arm along the extension direction of the guide grooves. The precision limiting post is threadedly connected to the positioning bracket, and its free end extends into the sliding area of ​​the sliding latching arm to abut against the hinge blades, thereby achieving the initial position preset and latching of the hinge blades.

[0035] In the above technical solution, the sliding fastening arm includes two guide flanges 15 for inserting into the guide groove. The lateral width of the two guide flanges is precisely matched with the lateral width of the guide groove to eliminate the gap movement of the sliding fastening arm in the lateral direction.

[0036] Furthermore, in the above technical solution, a V-shaped groove is provided on the side of the clamping end of the sliding fastening arm facing the precision limiting post. The geometric center line of the V-shaped groove is parallel to the sliding direction of the sliding fastening arm, which is used to adaptively center the cylindrical feature of the hinge blade.

[0037] Furthermore, in the above technical solution, the precision limiting post adopts a stepped cylindrical structure, and a stop 16 is formed between the two cylindrical segments with different diameters of the stepped cylindrical structure. The stop is used to tightly fit the end face of the threaded hole on the positioning bracket for installing the precision limiting post.

[0038] Furthermore, in the above technical solution, the positioning bracket has a U-shaped cross-section structure, and guide grooves are provided on the two vertical walls on the outer side of the U-shaped structure. The bottom of the U-shaped structure has threaded holes for installing precision limiting posts.

[0039] Furthermore, in the above technical solution, the length of the precision limiting post extending toward the sliding fastening arm is greater than the width of the clamping end of the sliding fastening arm along the sliding direction, in order to ensure that the precision limiting post continues to abut before the hinge blade is fully engaged.

[0040] Furthermore, in the above technical solution, the free end of the precision limiting post is machined into a chamfered frustum shape, with the small-diameter end of the chamfered frustum facing the hinge blade, in order to reduce the contact resistance between the hinge blade and the precision limiting post during the positioning process.

[0041] Furthermore, in the above technical solution, a dovetail groove is provided on the inner side of the guide flange of the sliding fastening arm along the length direction, and a dovetail protrusion is provided on the inner side wall of the guide groove of the positioning bracket. The dovetail groove and the dovetail protrusion cooperate to provide anti-lifting limit when the sliding fastening arm slides.

[0042] Furthermore, in the above technical solution, the chamfered frustum shape of the precision limiting post is made of zirconia ceramic material, which is used to provide high hardness and low coefficient of friction.

[0043] Furthermore, in the above technical solution, both the positioning bracket and the sliding buckle arm are made of high-strength aluminum alloy material. The high-strength aluminum alloy material is used to ensure the structural rigidity and lightweight of the buckle positioning component.

[0044] The method of using this utility model involves three main stages: initial setup and calibration, pre-positioning of the hinge blades, and rigid engagement of the hinge blades. In the initial setup stage, the engagement positioning component is first fixed to the worktable of the automatic assembly equipment via bolt holes at the bottom. The longitudinal direction of the positioning bracket should be parallel to the engagement axis of the hinge blades. Secondly, by screwing in or out the precision limiting post, and coordinating its locking nut and the stop on the positioning bracket, the axial position of the free end of the chamfered frustum shape of the precision limiting post is precisely adjusted. The axial position should coincide with the central axis of the final engagement position of the hinge to be assembled. The adjustment accuracy of the precision limiting post determines the final engagement accuracy. In the pre-positioning stage of the hinge blades, an external robot places two hinge blades into the working area of ​​the engagement positioning component. The first hinge blade is held by a fixing fixture on the assembly equipment, and the cylindrical feature of the second hinge blade faces the engagement positioning component. When the second hinge blade is inserted, its side first contacts the chamfered frustum-shaped end face of the precision limiting post, achieving precise axial pre-positioning and initial radial centering. During the rigid engagement stage of the hinge blade, an external pneumatic or electric push rod begins to drive the sliding engagement arm forward along the guide groove of the positioning bracket. The interlocking fit between the guide flange of the sliding engagement arm and the dovetail groove and dovetail protrusion of the guide groove ensures a smooth and gapless sliding process. The V-shaped groove at the clamping end of the sliding engagement arm contacts the second hinge blade and uses the self-centering property of the V-shaped groove to perform secondary precise positioning of the second hinge blade. The sliding engagement arm continues to push the second hinge blade forward until the second hinge blade engages with the first hinge blade, achieving the alignment required for pin insertion. During this process, the precision limiting post, due to its extension length being greater than the width of the clamping end of the sliding engagement arm, maintains rigid contact with the second hinge blade at all times. This continuous contact prevents any slight positional deviation caused by thrust transmission or vibration at the moment of engagement. Once the engagement is complete, the external pin insertion mechanism can safely and efficiently insert the pin. Finally, the sliding engagement arm retracts to its initial position, the robotic arm removes the assembled hinge, and the entire operation can proceed to the next cycle.

[0045] The following is a specific embodiment 1 of this utility model: The snap-fit ​​positioning component of this embodiment is specifically used for assembling a three-section hinge for a furniture door. It includes a positioning bracket made of 6061 aluminum alloy with a hard anodized finish. The positioning bracket has a longitudinal length of 180 mm and a transverse width of 60 mm. A rectangular groove with a depth of 15 mm is provided on the positioning bracket for guidance. The sliding snap-fit ​​arm is made of vacuum-hardened 45# steel with a nickel-plated surface to improve corrosion resistance. Its dimensions are designed to control the clearance between it and the rectangular groove of the positioning bracket to within 10 μm. The clamping end of the sliding snap-fit ​​arm has a V-shaped groove for precise alignment of the hinge cylinder. The angle of the V-shaped groove is 85° to enhance the wrapping of the clamped cylinder surface. The precision limiting post is made of 304 stainless steel and is connected to the positioning bracket via an M8 thread. The threaded connection is designed with a locking screw to prevent self-loosening. The head of the precision positioning post is injection-molded from high-molecular-weight polyethylene into a chamfered frustum shape. The polyethylene material provides cushioning when contacting the hinge blade, while ensuring positioning accuracy. The extension length of the precision positioning post is precisely set to 10 mm, exceeding the width of the sliding engagement arm's clamping end along the sliding direction. The precision positioning post provides an axial absolute position reference and rigid support for the hinge blade to be engaged before the sliding engagement arm's thrust is fully established. The engagement positioning assembly is bolted to the automated assembly workbench. The principle of the engagement positioning assembly is that the precision positioning post provides an axial absolute reference, while the sliding engagement arm provides rigid engagement and radial self-centering. The sliding engagement arm moves smoothly within the guide groove, ultimately pushing the hinge blade precisely towards the precision positioning post, achieving perfect alignment before engagement. The engagement positioning assembly supports high-speed automated assembly, offering high positioning accuracy and a long service life. It significantly improves assembly efficiency on automated production lines.

[0046] The following is another specific embodiment 2 of this utility model: This embodiment is based on embodiment 1, but upgrades the connection relationship between the sliding fastening arm and the positioning bracket. Specifically, a dovetail groove is provided along the length direction on the inner side of the guide flange of the sliding fastening arm, and a corresponding dovetail protrusion is provided on the inner side wall of the guide groove of the positioning bracket. The dovetail groove and the dovetail protrusion cooperate with each other at a dovetail angle of 45°. This dovetail cooperation replaces the simple rectangular cooperation in embodiment 1. When the sliding fastening arm pushes the hinge blade forward to apply the fastening force, the dovetail groove and the dovetail protrusion cooperate to provide a rigid self-locking limit in the vertical direction, preventing the sliding fastening arm from producing any form of slight upward or downward lifting or vibration, and further improving the positioning rigidity during the fastening process. In this embodiment, the chamfered frustum shape of the precision positioning post is made of zirconia ceramic material. The free end of zirconia ceramic material is more wear-resistant and has a lower surface friction coefficient. This material selection reduces contact wear and resistance with the hinge blades during high-frequency assembly, thereby extending the service life of the precision positioning post. Furthermore, zirconia ceramic material ensures long-term stability of the positioning repeatability accuracy. The depth of the rectangular groove in the positioning bracket is increased to 20 mm; this increased depth further enhances the guiding stability of the sliding locking arm.

[0047] The following is another specific embodiment 3 of this utility model: This embodiment is an upgrade of the installation structure of the precision limiting post and the positioning bracket based on embodiment 1. Specifically, the precision limiting post adopts a stepped cylindrical structure, and a stop is formed between the two cylindrical segments of different diameters of the stepped cylindrical structure. The annular end face of the stop contacts the precision-ground end face of the M8 threaded hole on the positioning bracket. When the precision limiting post is installed, the stop fits tightly against the end face of the threaded hole on the positioning bracket, which is used to ensure that the axial positioning of the precision limiting post no longer relies solely on the locking force of the thread, but achieves precise depth positioning and locking through the rigid contact between the stop and the end face. The design of the stop is used to provide higher axial positioning rigidity and higher adjustment accuracy than the simple threaded locking structure in embodiment 1. Furthermore, this embodiment upgrades the materials of the sliding locking arm and positioning bracket to higher-strength T7075-T651 aluminum alloy. The T7075-T651 aluminum alloy ensures that when assembling larger-sized heavy-duty industrial hinges, the locking and positioning assembly can withstand greater locking forces without exhibiting any measurable elastic or plastic deformation, guaranteeing positioning accuracy and stability in high-load applications. The V-groove angle of the sliding locking arm is optimized to 90° to accommodate a wider range of hinge cylinder diameters.

[0048] The following is another specific application scenario of this utility model, embodiment 4. This embodiment is applied to the assembly of a hinge for a smartphone flip cover structure, including a compact positioning bracket for assembling micro-components, a sliding snap-fit ​​arm for precise pushing, and a precision limiting post for micron-level pre-positioning. Specifically, the snap-fit ​​positioning component of this embodiment is used to meet the requirements of extremely high precision and extremely small tolerances in the assembly of micro-hinges. The positioning bracket is designed to be extremely compact, measuring 80mm × 30mm × 15mm, and its material is a titanium alloy with a very low coefficient of thermal expansion. The titanium alloy is used to minimize the impact of temperature changes on positioning accuracy. The guide groove of the positioning bracket is processed using an ultra-precision slow wire cutting process to achieve extremely high surface finish and micron-level dimensional accuracy. The sliding snap-fit ​​arm is also made of titanium alloy, and the fit clearance between its guide flange and guide groove is strictly controlled within 5μm. This extremely small clearance is used to achieve sub-micron-level sliding accuracy. The V-shaped groove on the clamping end of the sliding engagement arm has a 75° angle. This groove is designed to grip the micro-hinge pin hole sleeve, which is only 2 mm in diameter, providing high-restraint radial positioning. The body of the precision locating post is made of high-hardness tungsten steel to provide maximum rigidity support. Its head is coated with diamond, which has an extremely low coefficient of friction and extremely high hardness. The diamond coating minimizes friction and prevents wear during micro-hinge contact. The precision locating post is connected to the positioning bracket via an M3 ultra-fine thread. The stop on its stepped cylindrical structure is designed to be tapered. The tapered stop and the mating end face of the positioning bracket form a self-locking structure. This self-locking structure enables the precision locating post to be axially backlash-free and allows for highly repeatable depth adjustment. The length of the precision locating post extending towards the sliding engagement arm is precisely set to 1.5 times the width of the clamping end of the sliding engagement arm. This dimensional relationship ensures that the pre-positioning support of the precision locating post is not lost when the micro-hinge blade is pushed. The sliding locking arm is driven by an external high-precision piezoelectric ceramic actuator, which provides sub-micron level stroke control. When applied to smartphone hinge assembly, the locking positioning assembly achieves a positioning repeatability of ±0.005 mm, an extremely high precision that fully meets the stringent requirements of high-end electronic products for hinge assembly.

[0049] Specifically, the principle of this invention is as follows: the positioning function is transferred from the endpoint of the travel of the moving parts to a rigid, fixed, and precisely adjustable reference point to the precision limiting post. First, the positioning bracket, serving as a common reference for all components, provides a stable mounting platform due to its high rigidity. The precision limiting post is rigidly threaded to the positioning bracket via a stop and a stepped cylindrical structure, ensuring that its free end remains absolutely fixed in three-dimensional space regardless of external thrust. When the hinge blade to be engaged is inserted, it contacts the chamfered frustum-shaped free end of the precision limiting post, achieving precise axial and preliminary radial pre-positioning. Subsequently, the sliding engagement arm, driven by an external push rod, slides towards the hinge blade in a gapless, highly linear manner under the interlocking guidance of the dovetail groove and dovetail protrusion. The V-shaped groove at the clamping end of the sliding engagement arm automatically captures the cylindrical surface of the hinge blade at the moment of contact, achieving secondary precise radial positioning. Due to the specific dimensional relationship of the extended length of the precision limiting post, it remains in contact with the hinge blade throughout the entire engagement and pushing action of the sliding engagement arm. The sliding engagement arm and the precision limiting post together form a rigid and precise clamping of the hinge blade. This principle ensures that throughout the entire dynamic process of applying the engagement force, the hinge blade is always precisely locked at the reference position determined by the precision limiting post, fundamentally eliminating vibration and positional drift at the moment of engagement, and providing extremely stable alignment conditions for subsequent pin insertion.

Claims

1. A latching and positioning component of an automatic hinge assembly device, used for precisely positioning and latching two hinge blades of a hinge during the assembly process, characterized in that, It includes a positioning bracket, a sliding engagement arm, and a precision limiting post. The positioning bracket has a rectangular bottom surface, and parallel guide grooves are provided on both sides of the positioning bracket extending longitudinally. The sliding engagement arm has a clamping end for clamping the hinge blade, and the two sides of the sliding engagement arm respectively cooperate with the guide grooves of the positioning bracket to support the sliding engagement arm to slide along the extension direction of the guide grooves. The precision limiting post is threaded to the positioning bracket, and the free end of the precision limiting post extends into the sliding area of ​​the sliding engagement arm to abut against the hinge blade, thereby realizing the initial position preset and engagement of the hinge blade.

2. The fastening and positioning component of the automatic hinge assembly device according to claim 1, characterized in that, The sliding engagement arm includes two guide flanges for insertion into a guide groove. The lateral width of the two guide flanges precisely matches the lateral width of the guide groove to eliminate lateral clearance movement of the sliding engagement arm.

3. The fastening and positioning component of an automatic hinge assembly device according to claim 2, characterized in that, The clamping end of the sliding fastening arm has a V-shaped groove on the side facing the precision limiting post. The geometric center line of the V-shaped groove is parallel to the sliding direction of the sliding fastening arm, which is used to adaptively center the cylindrical feature of the hinge blade.

4. The fastening and positioning component of an automatic hinge assembly device according to claim 3, characterized in that, The precision positioning post adopts a stepped cylindrical structure. A stop is formed between the two cylindrical segments with different diameters of the stepped cylindrical structure. The stop is used to tightly fit the end face of the threaded hole on the positioning bracket for installing the precision positioning post.

5. The fastening and positioning component of an automatic hinge assembly device according to claim 4, characterized in that, The positioning bracket has a U-shaped cross-section structure. Guide grooves are provided on the two vertical walls on the outer side of the U-shaped structure, and threaded holes for installing precision limiting posts are provided at the bottom of the U-shaped structure.

6. The fastening and positioning component of an automatic hinge assembly device according to claim 5, characterized in that, The length of the precision limiting post extending toward the sliding engagement arm is greater than the width of the clamping end of the sliding engagement arm along the sliding direction, in order to ensure that the precision limiting post remains in contact before the hinge blades are fully engaged.

7. The fastening and positioning component of an automatic hinge assembly device according to claim 6, characterized in that, The free end of the precision limiting post is machined into a chamfered frustum shape, with the small-diameter end of the chamfered frustum facing the hinge blade, in order to reduce the contact resistance between the hinge blade and the precision limiting post during the positioning process.

8. The fastening and positioning component of an automatic hinge assembly device according to claim 7, characterized in that, A dovetail groove is provided on the inner side of the guide flange of the sliding fastening arm along the length direction, and a dovetail protrusion is provided on the inner side wall of the guide groove of the positioning bracket. The dovetail groove and the dovetail protrusion cooperate to provide anti-lifting limit when the sliding fastening arm slides.

9. The fastening and positioning component of an automatic hinge assembly device according to claim 8, characterized in that, The chamfered frustum shape of the precision positioning post is made of zirconia ceramic material, which is used to provide high hardness and low coefficient of friction.

10. The fastening and positioning component of an automatic hinge assembly device according to claim 9, characterized in that, Both the positioning bracket and the sliding locking arm are made of high-strength aluminum alloy, which is used to ensure the structural rigidity and lightweight of the locking and positioning components.

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