High self-locking plastic nest
By using a guide structure and asymmetric threaded self-tapping plastic nest with high anti-loosening properties, the problems of inaccurate positioning and cracking of plastic nests during high-speed assembly are solved, thereby improving assembly efficiency and anti-loosening performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU MINGYANG WIND POWER TECH CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-05
AI Technical Summary
Existing plastic nests are prone to shifting during high-speed assembly, have insufficient positioning accuracy, are prone to cracking during embedding, and have insufficient anti-loosening performance under vibration.
The drive structure is designed to ensure precise positioning and vibration resistance by employing a guide structure and a self-correcting guide thread with a high-loosening self-tapping plastic nest, combined with asymmetrical tooth profile threads and V-shaped anti-dislodgement grooves.
It achieves precise positioning, reduces stress damage, improves assembly yield and anti-loosening effect, ensures long-term fastening force under dynamic load, and simplifies the assembly process.
Smart Images
Figure CN224326540U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic nesting technology, and in particular to a highly anti-loosening self-tapping plastic nest. Background Technology
[0002] Plastic nesting fasteners are made of engineering plastics. Their function is to directly screw into materials such as plastic, wood, or thin metal through their own threads to form a strong threaded connection. They also utilize the elasticity and friction properties of plastic to effectively prevent screws from loosening under vibration or impact. They also have the advantages of insulation, corrosion resistance, and lightweight. They are widely used in electronics, automobiles, furniture and other fields to simplify the installation process and improve connection reliability.
[0003] However, existing technologies have several problems: First, due to the lack of effective guiding structures or pre-positioning designs, inserts are prone to shifting during high-speed assembly, resulting in insufficient positioning accuracy. Second, improper control of the matching tolerance between the insert's outer diameter and the plastic part's hole diameter, or unreasonable design of the plastic part's wall thickness, leads to localized stress concentration during insertion, which in turn causes substrate cracking. Furthermore, if the insert material lacks elasticity or the anti-loosening structure design is simplistic (e.g., relying solely on ordinary threads), it is prone to failure due to creep relaxation under continuous vibration or alternating loads, making it difficult to maintain stable anti-loosening performance over a long period. Therefore, we propose a highly anti-loosening self-tapping plastic insert. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a highly anti-loosening self-tapping plastic nest. It uses a drive head inserted into the insert to drive the self-tapping screwing into the plastic part. The guide structure at the front end of the nest and the self-correcting guide thread ensure accurate positioning of the product during insertion.
[0005] The purpose of this utility model is achieved as follows: a high-anti-loosening self-tapping plastic nest includes a stud and a flange. The stud and the flange are integrally formed. The stud is provided with a self-tapping thread on its outer side and a guide thread at one end. A transition thread is provided between the self-tapping thread and the guide thread. A thread anti-loosening groove is provided on the self-tapping thread. A through hole is provided inside the stud. An internal thread is provided inside the stud. A driving structure is provided inside the stud.
[0006] Optionally, the diameter of the flange is larger than the diameter of the stud, and the flange is thin-walled.
[0007] Optionally, the self-tapping thread has an asymmetrical tooth profile, including a tooth profile on the tapping side and a tooth profile on the non-tapping side.
[0008] Optionally, there may be multiple anti-slip grooves, which are arranged in a V-shape, and the groove depth of the thread anti-slip groove is equal to the tooth height of the self-tapping thread.
[0009] Optionally, the drive structure includes a top drive, the lower end of the flange is provided with a boss, the top drive passes through the flange and the boss, and the interior of the top drive has a polygonal structure.
[0010] Optionally, the drive structure includes an internal drive that passes through the stud and the flange, and one end of the internal drive is chamfered.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0012] 1. By setting a top drive structure, the drive head is inserted into the insert drive structure to directly self-tap and screw into the plastic part. The guide thread at the nested front end can achieve precise positioning, ensuring a stable and reliable self-tapping screwing process. The self-tapping thread adopts a special tooth profile angle to reduce the tapping resistance, making the assembly smoother and more efficient, while reducing stress damage to the plastic part. Among them, the thread anti-loosening groove has the function of preventing loosening and storing the cutting waste generated during the self-tapping process, avoiding blockage and affecting the assembly quality. In addition, the V-shaped structure gives the self-tapping thread a certain elastic deformation capacity. When there is a slight deviation from the hole diameter of the plastic part, it can adaptively release local stress, preventing the plastic part from cracking due to extrusion, and significantly improving the assembly yield.
[0013] 2. While ensuring self-tapping performance, this utility model maintains the standard specifications of the internal thread, which can be directly assembled with bolts, etc., taking into account both anti-loosening and versatility. At the same time, by optimizing the parameters and guiding geometry of the self-tapping thread, a fast and accurate assembly process is achieved. The anti-dislodgement thread and its V-shaped structure further enhance the vibration resistance of the nesting, and can maintain the fastening force for a long time even under dynamic loads. It can solve the problems of inaccurate positioning and easy cracking of traditional inserts, and improve the anti-loosening effect and assembly efficiency. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the overall structure of the first embodiment provided by this utility model.
[0016] Figure 2 This is a cross-sectional view of the overall structure of the first embodiment provided by this utility model.
[0017] Figure 3 This is a schematic diagram of the thread anti-loosening structure provided by this utility model.
[0018] Figure 4 This is a schematic diagram of the overall structure of the second embodiment provided by this utility model.
[0019] Figure 5 This is a cross-sectional view of the overall structure of the second embodiment provided by this utility model.
[0020] Figure 6 This is a schematic diagram of the internal drive provided by this utility model.
[0021] In the diagram: 1. Stud; 11. Self-tapping thread; 12. Guide thread; 13. Transition thread; 14. Thread anti-slip groove; 2. Flange; 21. Boss; 3. Internal thread; 4. Drive structure; 41. Top drive; 42. Internal drive. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] like Figures 1 to 6 The illustrated high-anti-loosening self-tapping plastic nest includes a stud 1 and a flange 2. The stud 1 and the flange 2 are integrally formed. The stud 1 has a self-tapping thread 11 on its outer side and a guide thread 12 on one end. A transition thread 13 is provided between the self-tapping thread 11 and the guide thread 12. A thread anti-loosening groove 14 is provided on the self-tapping thread 11. A through hole is provided inside the stud 1. An internal thread 3 is provided inside the stud 1. A drive structure 4 is provided inside the stud 1. The diameter of the flange 2 is larger than the diameter of the stud 1. The flange 2 is thin-walled.
[0024] It should be noted that the flange 2 at the upper end of the stud 1 is designed to be large and thin to prevent the plastic from being crushed. Increasing the diameter of the flange 2 can increase the contact area between the flange 2 and the plastic, disperse the axial pressure, reduce the pressure per unit area, and prevent the local stress from exceeding the compressive strength of the plastic. At the same time, the flange 2 has the ability to deform elastically, and can bend slightly under pressure to absorb some of the assembly impact energy and prevent the plastic from cracking due to rigid impact.
[0025] Furthermore, the drive head insertion insert drive structure 4 is used to directly self-tap and screw into the plastic part. The guide thread 12 at the nested front end can achieve precise positioning, ensuring a stable and reliable self-tapping screwing process. The self-tapping thread 11 adopts a special tooth profile angle to reduce the tapping resistance, making the assembly smoother and more efficient, while reducing stress damage to the plastic part. Among them, the thread anti-loosening groove 14 has the function of preventing loosening and storing the cutting waste generated during the self-tapping process, avoiding blockage and affecting the assembly quality. In addition, the V-shaped structure gives the self-tapping thread 11 a certain elastic deformation capacity. When there is a slight deviation from the hole diameter of the plastic part, it can adaptively release local stress, preventing the plastic part from cracking due to extrusion, and significantly improving the assembly yield.
[0026] Specifically, the tooth profile of the self-tapping thread 11 is an asymmetrical structure, including the tooth profile on the tapping side and the tooth profile on the non-tapping side;
[0027] It should be noted that the tooth profile angle on the tapping side of the self-tapping thread 11 is 30°, and the tooth profile angle on the non-tapping side of the self-tapping thread 11 is 10°.
[0028] Furthermore, the 30° angle of the self-tapping thread 11 on the tapping side has a cutting guiding function, providing chip removal space. At the same time, the 30° angle of the tapping side makes the thread tip sharper, reducing the initial contact area with the plastic, reducing cutting resistance, and increasing the inter-tooth volume.
[0029] The non-penetrating side tooth profile angle is 10°, which increases the thickness of the thread root and improves the shear strength under the same material. The near-vertical force-bearing surface can generate a larger normal force, which improves the holding force under vibration.
[0030] Specifically, there are multiple anti-slip grooves, which are set in a V shape. The groove depth of the thread anti-slip groove 14 is equal to the tooth height of the self-tapping thread 11.
[0031] Furthermore, firstly, the V-shaped geometry allows the insert to effectively store cutting waste during self-tapping, preventing thread jamming caused by debris accumulation and ensuring smooth assembly. Secondly, multiple anti-loosening grooves are evenly distributed on the thread, forming periodic anti-loosening nodes. In a vibration environment, they generate multi-point resistance through mechanical interference, improving the anti-loosening effect. At the same time, the thread anti-loosening groove 14 is the same depth as the thread tooth height, ensuring that the groove has sufficient volume to accommodate debris without weakening the structural strength of the thread body. In addition, the elastic deformation characteristics of the V-shaped structure give the thread self-adaptive ability, which can buffer stress through groove deformation and prevent plastic cracking.
[0032] Specifically, the drive structure 4 includes a top drive 41, and a boss 21 is provided at the lower end of the flange 2. The top drive 41 passes through the boss 21, and the interior of the top drive 41 has a polygonal structure.
[0033] In embodiment 1, a boss 21 is provided at the lower end of the flange 2, and a top drive 41 with a polygonal structure is provided in the inner cavity of the flange 2 and the boss 21. The polygonal structure is greater than or equal to hexagonal, and the lower end of the top drive 41 contacts the internal thread 3, which penetrates the stud 1.
[0034] Furthermore, this design features a boss 21 at the lower end of flange 2, with a top drive 41 penetrating both flange 2 and boss 21. The boss 21 has a multi-angled structure, which enhances the rigidity of the drive mechanism and prevents the drive teeth from slipping or breaking due to plastic deformation during tightening. The multi-angled drive provides uniform torque transmission, ensuring stability during the self-tapping process. In addition, the integrated design of the top drive 41 and flange 2 facilitates rapid positioning by automated equipment, improving assembly efficiency. The support provided by the boss 21 also helps to distribute stress and prevent flange 2 from cracking due to excessive local stress, making it particularly suitable for the reliable fixing of thin-walled plastic parts.
[0035] Specifically, the drive structure 4 includes an inner drive 42, which passes through the stud 1 and the flange 2, and one end of the inner drive 42 is chamfered.
[0036] In the second embodiment, through holes are opened in the flange 2 and the stud 1, and a full-length internal thread 3 is provided. A hexagonal internal drive 42 is also provided. The internal drive 42 is directly formed by secondary machining on the standard internal thread 3.
[0037] Furthermore, the internal drive 42 is directly machined on the standard internal thread 3, which retains the connection function of the thread and can also add a drive interface, saving extra space. The hexagonal internal drive 42 structure is compatible with general tools and has strong compatibility. Since the drive structure 4 is coaxial with the thread, the torque transmission is more direct, reducing the risk of off-center load, while avoiding extrusion damage to the outer wall of the plastic part.
[0038] Working principle: While ensuring self-tapping performance, the internal thread 3 adopts standard specifications and can be directly assembled with bolts, etc., taking into account both anti-loosening and versatility. At the same time, by optimizing the parameters and guiding geometry of the self-tapping thread 11, a fast and accurate assembly process is achieved. The thread anti-dislodgement groove 14 and its V-shaped structure further enhance the vibration resistance of the nesting, and can maintain the fastening force for a long time even under dynamic loads. It can solve the problems of inaccurate positioning and easy cracking of traditional inserts, and improve the anti-loosening effect and assembly efficiency.
[0039] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A high-resistance self-tapping plastic nest, comprising a stud (1) and a flange (2), characterized in that: The stud (1) and the flange (2) are integrally formed. The stud (1) has a self-tapping thread (11) on its outer side and a guide thread (12) at one end. A transition thread (13) is provided between the self-tapping thread (11) and the guide thread (12). A thread anti-dislodgement groove (14) is provided on the self-tapping thread (11). A through hole is provided inside the stud (1). An internal thread (3) is provided inside the stud (1). A drive structure (4) is provided inside the stud (1).
2. The high-anti-loosening self-tapping plastic nest according to claim 1, characterized in that: The diameter of the flange (2) is larger than the diameter of the stud (1), and the flange (2) is thin-walled.
3. The high anti-loosening self-tapping plastic nest according to claim 1, characterized in that: The self-tapping thread (11) has an asymmetrical tooth profile, including the tooth profile on the tapping side and the tooth profile on the non-tapping side.
4. The high anti-loosening self-tapping plastic nest according to claim 1, characterized in that: The number of anti-detachment grooves is multiple, the anti-detachment grooves are arranged in a V shape, and the groove depth of the thread anti-detachment groove (14) is equal to the tooth height of the self-tapping thread (11).
5. A high-anti-loosening self-tapping plastic nest according to claim 1, characterized in that: The drive structure (4) includes a top drive (41), and a boss (21) is provided at the lower end of the flange (2). The top drive (41) passes through the boss (21), and the interior of the top drive (41) has a polygonal structure.
6. The high-anti-loosening self-tapping plastic nest according to claim 1, characterized in that: The drive structure (4) includes an inner drive (42), which passes through the stud (1) and the flange (2), and one end of the inner drive (42) is chamfered.