A new type of non-extraction casing combination screw

Abstract

The utility model discloses a novel non -out sleeve pipe combination screw, including screw, open snap ring and sleeve. Screw is by screw rod, transition rod and nut and is composed, and the front section of screw rod is equipped with screw thread, and the back section is equipped with annular clamping groove, open snap ring is detachably connected in annular clamping groove, and its normal internal diameter is less than the outer diameter of screw rod and can be elastically pressed into annular clamping groove, sleeve is equipped with inner hole, and the side of inner hole close to nut is equipped with annular inner step, and its inner diameter is greater than the outer diameter of open snap ring compression state and less than normal external diameter, and the edge of annular inner step is equipped with R angle structure. The utility model discloses the cooperation design of open snap ring and annular inner step, effectively prevent sleeve accidental separation, enhance the stability of connection, R angle structure reduces assembly resistance, avoids the damage of traditional stamping assembly to plating, improves corrosion resistance. In addition, the right angle structure and transition groove design of annular inner step far from nut side further improve the fatigue resistance and limiting effect.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a novel non-detachable sleeve combination screw. Background Technology

[0002] Screws, as basic fasteners, achieve mechanical connections through the action of inclined plane rotation and friction. With industrial development, combined screws (such as screw and sleeve assemblies) have gradually become an industry trend in order to save manpower and facilitate operation. However, the design of such assemblies faces multiple technical challenges: First, the geometric parameters of the sleeve (such as the inner hole size and the length of the sleeve) must be precisely matched with the screw, otherwise the assembly performance will be affected; second, in order to meet the corrosion resistance requirements, the screw and sleeve need to be surface treated (such as electroplating) before assembly, but the subsequent stamping assembly process will destroy the plating structure, resulting in a significant decrease in corrosion resistance; more importantly, stamping deformation may change the fit tolerance, causing unstable mechanical properties of the assembly, and even unexpected separation during use.

[0003] Therefore, in view of the shortcomings of the existing technology, it is necessary to design a new type of non-removable sleeve combination screw to solve the above problems.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solution of this utility model and facilitating the understanding of those skilled in the art. It should not be assumed that the above content is known to those skilled in the art simply because it has been described in the background section of this utility model. Utility Model Content

[0005] To overcome the shortcomings of the prior art, the present invention aims to disclose a novel non-detachable sleeve combination screw, which reduces damage to the parts themselves and the surface coating during assembly, thereby better ensuring the anti-detachment function of the parts and the integrity of the surface coating.

[0006] This utility model discloses a novel non-removable sleeve combination screw, comprising:

[0007] A screw comprises a threaded rod and a transition rod connected in sequence, wherein the diameter of the threaded rod is not less than the diameter of the transition rod; the outer periphery of the front section of the threaded rod is provided with threads, and the outer periphery of the rear section is provided with an annular groove; a nut is provided at the rear end of the transition rod.

[0008] An open retaining ring is detachably engaged in an annular groove. The inner diameter of the open retaining ring is smaller than the outer diameter of the screw under normal conditions and can be elastically pressed into the annular groove.

[0009] The sleeve includes an axially oriented inner bore with an inner diameter larger than that of the screw. An annular inner step is provided on the inner circumference of the inner bore near the nut. The inner diameter of the annular inner step is larger than the outer diameter of the cotter snap ring under compressed state but smaller than the outer diameter of the cotter snap ring under normal state. The inner diameter edge of the annular inner step near the nut has an inwardly recessed R-angle structure. This R-angle structure allows the cotter snap ring to slide smoothly into the inner bore of the sleeve, reducing assembly resistance and simplifying manual or automated assembly.

[0010] Preferred technical solution: The cross-section of the open retaining ring is circular to reduce the resistance to sleeve assembly.

[0011] Preferred technical solution: The normal inner diameter of the open retaining ring is 1.0 to 1.5 times the outer diameter of the bottom of the annular retaining groove plus the wire diameter of the open retaining ring.

[0012] Preferred technical solution: The side of the inner step of the ring away from the nut is a right-angle structure, which provides a stronger limiting effect and prevents the sleeve from coming off the screw during use.

[0013] Preferred technical solution: The surfaces of the screw and the open retaining ring are coated with a metal layer.

[0014] Preferred technical solution: A transition groove is provided between the annular groove and the thread to facilitate the introduction of the open retaining ring and to lift the open retaining ring after introduction, preventing the open retaining ring from coming out of the groove.

[0015] Preferred technical solution: The length of the sleeve is less than the total length of the screw and the transition rod.

[0016] Preferred technical solution: The side of the nut closest to the screw has a planar structure.

[0017] Preferred technical solution: The outer periphery of the sleeve near the nut end is provided with an annular outer step.

[0018] Preferred technical solution: The top of the nut has an inner plum blossom-shaped cavity, which facilitates installation and disassembly.

[0019] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0020] 1) Excellent anti-loosening performance: The design of the open retaining ring and the inner step of the ring prevents the sleeve from accidentally coming off the screw after assembly, thus enhancing the connection stability; the elastic snap-fit ​​structure of the ring groove and the open retaining ring ensures that the combined screw can remain tight even under vibration or impact.

[0021] 2) Protect the surface coating and improve corrosion resistance: The R-angle structure design allows the open retaining ring to slide smoothly into the inner hole of the sleeve, reducing assembly resistance and avoiding damage to the screw and sleeve coating caused by traditional stamping assembly, ensuring the integrity of the electroplating layer; the screw and open retaining ring can be pre-treated separately before assembly, improving the overall corrosion resistance.

[0022] 3) Wide range of applications: The sleeve length, opening retainer wire diameter and other parameters can be adjusted according to different needs to adapt to a variety of industrial scenarios. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an exploded view of a novel non-removable sleeve combination screw in Embodiment 1;

[0025] Figure 2 This is a longitudinal sectional view of a novel non-removable sleeve combination screw in Embodiment 1;

[0026] Figure 3 This is a schematic diagram of the screw structure in Example 2.

[0027] In the above figures, 1 is a screw; 11 is a threaded rod; 111 is a thread; 112 is an annular groove; 113 is a transition groove; 12 is a transition rod; 13 is a nut; 2 is an open retaining ring; 3 is a sleeve; 31 is an inner hole; 32 is an annular inner step; 321 is a radius-angle structure; 322 is a right-angle structure; and 33 is an annular outer step. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the description of embodiments of this application herein. Furthermore, the terms "comprising" and "having," and their synonyms, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setting," "equipped with," "connection," "linking," "fitting," and "fitting" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Similarly, "fitting" can mean completely or partially fitted. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Example 1:

[0035] like Figure 1 and Figure 2As shown, this utility model discloses a novel non-removable sleeve combination screw, including a screw 1, an open retaining ring 2, and a sleeve 3. The main components of this utility model will be described in detail below:

[0036] Screw 1: Composed of a screw 11, a transition rod 12, and a nut 13. The front section of the screw 11 has a thread 111 on its outer periphery, and the rear section has an annular groove 112 on its outer periphery. The rear end of the transition rod 12 is provided with a nut 13, which has a flat structure on the side near the screw 11 and an inner perforated cavity at the top for easy installation and disassembly.

[0037] Open snap ring 2: Its cross-section is circular, and its inner diameter under normal conditions is smaller than the outer diameter of the screw 11. It can be elastically pressed into the annular groove 112. The inner diameter of the open snap ring 2 is 1.2 times the outer diameter of the bottom of the annular groove 112 plus the wire diameter of the open snap ring 2, ensuring a firm connection and easy assembly.

[0038] Sleeve 3: It has an inner hole 31, the inner diameter of which is larger than the diameter of the screw 11. An annular inner step 32 is provided on the side of the inner hole 31 near the nut 13. The inner diameter of the annular inner step 32 is larger than the outer diameter of the open retaining ring 2 under compressed state but smaller than its normal outer diameter. The edge of the annular inner step 32 near the nut 13 has a radius (R) angle structure 321, and the side away from the nut 13 has a right angle structure 322. An annular outer step 33 is provided on the outer periphery of the sleeve 3 near the nut 13 end to enhance structural strength.

[0039] The method of use and principle of this utility model are as follows:

[0040] Step 1: Press the open retaining ring 2 into the annular groove 112 of the screw 1, and use its elastic deformation to achieve snap-fit ​​fixation.

[0041] Step 2: Electroplating is performed on screw 1 and open retaining ring 2, and surface treatment is performed on sleeve 3.

[0042] Step 3: Slide the sleeve 3 onto the front end of the screw 11. Under the guidance of the R-angle structure 321, the open retaining ring 2 gradually retracts and smoothly slides over the annular inner step 32.

[0043] Step 4: After the open retaining ring 2 has completely passed through the inner annular step 32, it returns to its normal outer diameter and forms a limiting fit with the right-angle structure 322 to prevent the sleeve 3 from coming out.

[0044] Beneficial effects:

[0045] 1. The design of the opening retaining ring 2 and the inner step 32 effectively prevents the sleeve 3 from accidentally coming off, enhancing the connection stability.

[0046] 2. The R-angle structure 321 reduces assembly resistance, avoids damage to the coating caused by traditional stamping assembly, and improves corrosion resistance.

[0047] 3. The right-angle structure 322 further enhances the limiting effect.

[0048] Example 2:

[0049] like Figure 3 As shown, the main difference between this embodiment and embodiment one is that a transition groove 113 is provided between the annular groove 112 and the thread 111, which is used to facilitate the introduction of the open retaining ring 2 and to lift the open retaining ring 2 after introduction, preventing the open retaining ring 2 from coming out of the groove.

[0050] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel non-removable sleeve combination screw, characterized in that, include: The screw (1) comprises a screw rod (11) and a transition rod (12) connected in sequence. The diameter of the screw rod (11) is not less than the diameter of the transition rod (12). The front section of the screw rod (11) is provided with a thread (111) and the rear section is provided with an annular groove (112). The rear end of the transition rod (12) is provided with a nut (13). An open retaining ring (2) is detachably engaged in the annular groove (112). The inner diameter of the open retaining ring (2) under normal conditions is smaller than the outer diameter of the screw (11) and can be elastically pressed into the annular groove (112). The sleeve (3) includes an inner hole (31) arranged along the axial direction. The inner diameter of the inner hole (31) is larger than the diameter of the screw (11). The inner circumference of the inner hole (31) near the nut (13) is provided with an annular inner step (32). The inner diameter of the annular inner step (32) is larger than the outer diameter of the open retainer (2) under compression and smaller than the outer diameter of the open retainer (2) under normal conditions. The inner diameter edge of the annular inner step (32) near the nut (13) is provided with an inwardly recessed R-angle structure (321).

2. The novel non-removable sleeve combination screw according to claim 1, characterized in that: The cross-section of the open retaining ring (2) is circular.

3. The novel non-removable sleeve combination screw according to claim 1, characterized in that: The normal inner diameter of the open retaining ring (2) is 1.0 to 1.5 times the outer diameter of the bottom of the annular retaining groove (112) plus the wire diameter of the open retaining ring (2).

4. The novel non-removable sleeve combination screw according to claim 1, characterized in that: The side of the annular inner step (32) away from the nut (13) is a right-angle structure (322).

5. A novel non-removable sleeve combination screw according to claim 1, characterized in that: The surfaces of the screw (1) and the open retaining ring (2) are provided with a metal plating.

6. A novel non-removable sleeve combination screw according to claim 1, characterized in that: A transition groove (113) is provided between the annular groove (112) and the thread (111).

7. A novel non-removable sleeve combination screw according to claim 1, characterized in that: The length of the sleeve (3) is less than the total length of the screw (11) and the transition rod (12).

8. A novel non-removable sleeve combination screw according to claim 1, characterized in that: The nut (13) has a planar structure on the side near the screw (11).

9. A novel non-removable sleeve combination screw according to claim 1, characterized in that: The sleeve (3) has an annular outer step (33) on the outer periphery near the nut (13).

10. A novel non-removable sleeve combination screw according to claim 1, characterized in that: The top of the nut (13) is provided with an inner plum blossom-shaped cavity.

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