Locking and fixing structure for anodic oxidation of metal shell

Abstract

A locking and fixing structure for anodic oxidation of a metal shell comprises a nut block, an expansion sleeve and a compression nut, one end of the nut block is connected with a first screw, the other end of the nut block is provided with a first conical surface, and the middle of the first conical surface is connected with a second screw; the expansion sleeve sleeves the second screw rod; an expansion strip is arranged at one end of the expansion sleeve; the upper half section of the expansion strip is arranged to be a concave groove surface; the groove surface is used for being matched with a locking hole of a metal shell; the compression nut is in threaded connection with the second screw rod, and the compression nut abuts against the end, away from the nut block, of the expansion sleeve; a fixing nut is connected to the first screw rod through threads and used for fixing the nut block to an external supporting structure. According to the utility model, the defects in the prior art are overcome, the bolt can be effectively prevented from loosening under the influence of external factors such as vibration or temperature change, the stability of the connection between the metal shell and the hanger is ensured, and the consistency and the reliability of the anodic oxidation process quality are improved.

Description

Technical Field

[0001] This utility model relates to the field of metal surface treatment tooling technology, specifically to a locking and fixing structure for anodizing a metal casing. Background Technology

[0002] In fields such as consumer electronics and automotive parts, aluminum / magnesium alloy casings need to undergo anodizing to improve surface hardness and corrosion resistance.

[0003] Currently, the common method for securing metal casings is direct threaded locking, where bolts are inserted through locking holes in the casing and attached to the bracket. However, in practice, it has been found that during threaded locking, line contact friction occurs between the bolt and the inner wall of the locking hole. Furthermore, under the influence of external factors such as vibration or temperature changes, traditional locking methods are prone to bolt loosening, leading to a decrease in the stability of the connection between the metal casing and the bracket, thus affecting the consistency and reliability of the anodizing process quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a locking and fixing structure for anodizing metal casings. This structure overcomes the deficiencies of existing technologies, is reasonably designed, and can effectively prevent bolts from loosening under the influence of external factors such as vibration or temperature changes. It ensures the stability of the connection between the metal casing and the bracket, and improves the consistency and reliability of the anodizing process quality.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A locking and fixing structure for anodizing a metal casing includes a nut block, an expansion sleeve, and a clamping nut. One end of the nut block is coaxially fixedly connected to a first screw, and the other end of the nut block is provided with a first conical surface. A second screw is coaxially fixedly connected to the middle of the first conical surface.

[0007] The expansion sleeve is fitted over the second screw. An expansion strip is provided at one end of the expansion sleeve near the nut block. The expansion strip is evenly distributed along the circumference of the expansion sleeve, and the inner wall of the expansion strip is in contact with the first conical surface. The upper half of the expansion strip is set as a concave groove surface. The groove surface is used to mate with the locking hole of the metal shell. The clamping nut is threadedly connected to the second screw, and the clamping nut abuts against the end of the expansion sleeve away from the nut block. A fixing nut is threadedly connected to the first screw, and the fixing nut is used to fix the nut block to the external support structure.

[0008] Preferably, the end of the clamping nut near the expansion sleeve is provided with a second conical surface, which fits against the inner wall of the lower end of the expansion sleeve.

[0009] Preferably, the nut block, the first screw, and the second screw are integrated into a single structure.

[0010] Preferably, the inner wall of the expansion strip near the nut block is provided with a guide slope.

[0011] This invention provides a locking and fixing structure for anodizing metal casings, offering the following advantages: By incorporating an expansion strip, under the action of the clamping nut, the expansion strip gradually expands outward along the guide of the first conical surface. Its grooved surface forms a surface contact with the inner wall of the locking hole in the metal casing, significantly increasing the contact area and reducing the pressure per unit area, thereby minimizing scratches. Simultaneously, the axial compression deformation generated at the root of the expansion strip fills the gap at the end face of the locking hole, enhancing the stability of the locking and effectively preventing loosening of the bolts under the influence of external factors such as vibration or temperature changes. This ensures the stability of the connection between the metal casing and the bracket, improving the consistency and reliability of the anodizing process. Furthermore, the installation process of this locking and fixing structure is simple and quick, improving work efficiency, reducing production costs, and has broad application prospects. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of this utility model or the prior art will be briefly introduced below.

[0013] Figure 1 A schematic diagram of the structure of this utility model;

[0014] Figure 2 A schematic diagram of the structure of the nut block, the first screw, and the second screw in this utility model;

[0015] Explanation of the labels in the diagram:

[0016] 1. Nut block; 2. Expansion sleeve; 3. Compression nut; 4. First screw; 5. First conical surface; 6. Second screw; 7. Expansion strip; 8. Groove surface; 10. Second conical surface. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0018] Example 1, as Figure 1-2 As shown, a locking and fixing structure for anodizing a metal casing includes a nut block 1, an expansion sleeve 2, and a clamping nut 3. One end of the nut block 1 is coaxially fixedly connected to a first screw 4, and the other end of the nut block 1 is provided with a first conical surface 5. A second screw 6 is coaxially fixedly connected to the middle of the first conical surface 5.

[0019] The expansion sleeve 2 is fitted outside the second screw 6. An expansion strip 7 is provided at one end of the expansion sleeve 2 near the nut block 1. The expansion strip 7 is evenly distributed along the circumference of the expansion sleeve 2, and the inner wall of the expansion strip 7 is in contact with the first conical surface 5. The upper half of the expansion strip 7 is set as a concave groove surface 8. The groove surface 8 is used to cooperate with the locking hole of the metal shell. The clamping nut 3 is threadedly connected to the second screw 6, and the clamping nut 3 abuts against the end of the expansion sleeve 2 away from the nut block 1. A fixing nut is threadedly connected to the first screw 4. The fixing nut is used to fix the nut block 1 to the external support structure.

[0020] Working principle:

[0021] In practical use, firstly, the second screw 6 at one end of the nut block 1 is passed through the locking hole of the metal shell. Then, the expansion sleeve 2 is fitted onto the second screw 6, so that the groove surface 8 of the expansion strip 7 is engaged in the inner wall of the locking hole. Next, the clamping nut 3 is screwed onto the second screw 6, and by tightening the clamping nut 3, it abuts against the end of the expansion sleeve 2, thereby pushing the expansion strip 7 towards the nut block 1. At this time, the first conical surface 5 of the end face of the nut block 1 can guide the expansion strip 7 to apply a radially outward expanding pressure, so that the groove surface 8 can tightly fit into the inner wall of the locking hole of the metal shell, and the axial compression deformation generated at the root of the expansion strip 7 fills the gap at the end face of the locking hole, thereby achieving a firm lock on the metal shell. Then, the first screw 4 is tightened onto the external support structure with the fixing nut to ensure the stable installation of the entire locking and fixing structure.

[0022] When disassembly is required, simply loosen the clamping nut 3 to release the force on the end of the expansion sleeve 2. Then, retract the root of the expansion bar 7 to release the pressure on the inner wall of the locking hole of the metal shell, making it easier to pull the expansion sleeve 2 out of the locking hole. After that, pull the second screw 6 out of the locking hole to complete the disassembly. The whole process is simple to operate and effectively improves the clamping efficiency during the anodizing treatment of the metal shell.

[0023] In this invention, under the action of the clamping nut 3, the expansion strip 7 gradually expands outward along the guide of the first conical surface 5. Its grooved surface 8 forms a surface contact with the inner wall of the locking hole in the metal casing, greatly increasing the contact area and reducing the pressure per unit area, thereby reducing scratches. Simultaneously, the axial compression deformation generated at the root of the expansion strip 7 fills the gap at the end face of the locking hole, enhancing the stability of the locking and effectively preventing the bolts from loosening under the influence of external factors such as vibration or temperature changes. This ensures the stability of the connection between the metal casing and the bracket, and improves the consistency and reliability of the anodizing process. Furthermore, the installation process of this locking and fixing structure is simple and quick, improving work efficiency, reducing production costs, and has broad application prospects.

[0024] In Example 2, as a further preferred embodiment of Example 1, a second conical surface 10 is provided at the end of the clamping nut 3 near the expansion sleeve 2, and the second conical surface 10 fits against the inner wall of the lower end of the expansion sleeve 2. Through the guiding effect of the second conical surface 10, the expansion sleeve 2 pushes the expansion strip 7 outward more smoothly when under pressure, thereby ensuring good contact between the groove surface 8 and the inner wall of the locking hole of the metal shell, further improving the locking effect and clamping accuracy. Furthermore, through the guiding structure that cooperates with the expansion sleeve 2, the second conical surface 10 has the same taper as the first conical surface 5, ensuring that the expansion strip 7 is subjected to uniform force during expansion, avoiding skewing or twisting of the expansion sleeve 2 during tightening of the clamping nut 3, and improving the service life and stability of the locking structure. Furthermore, the provision of the second conical surface 10 enhances the tightness of the fit between the clamping nut 3 and the expansion sleeve 2, improving the axial load-bearing capacity of the overall locking structure.

[0025] In Example 3, as a further preferred embodiment of Example 1, the nut block 1, the first screw 4, and the second screw 6 are designed as a single integrated structure. This integrated structure effectively improves the strength and stability of the entire locking and fixing structure. In actual manufacturing, the nut block 1, the first screw 4, and the second screw 6 can be machined into a single unit using turning, milling, or other one-step forming processes, avoiding assembly errors between multiple components and improving product precision and reliability. Simultaneously, the integrated structure reduces the number of connection points between components, lowering the failure rate caused by loose or damaged connections and extending the product's service life.

[0026] In Example 4, as a further preferred embodiment of Example 1, a guide slope is provided on the inner wall of the expansion strip 7 near the nut block 1. By providing a guide slope on the inner wall of the root of the expansion strip 7, the guide slope can guide the expansion strip 7 when it is pushed by the clamping nut 3, allowing the expansion strip 7 to expand outward more smoothly along the taper direction of the first conical surface 5. This design not only improves the expansion efficiency of the expansion strip 7, but also ensures that the expansion strip 7 is subjected to more uniform force during the expansion process, avoiding deformation or damage caused by uneven force. At the same time, the guide slope can also enhance the tightness of the fit between the expansion strip 7 and the first conical surface 5, further improving the stability and reliability of the locking and fixing structure.

[0027] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A locking and fixing structure for anodizing a metal casing, characterized in that: It includes a nut block (1), an expansion sleeve (2) and a clamping nut (3). One end of the nut block (1) is coaxially fixedly connected to a first screw (4), and the other end of the nut block (1) is provided with a first conical surface (5). A second screw (6) is coaxially fixedly connected to the middle of the first conical surface (5). The expansion sleeve (2) is sleeved on the outside of the second screw (6). An expansion strip (7) is provided at one end of the expansion sleeve (2) near the nut block (1). The expansion strip (7) is evenly distributed along the circumference of the expansion sleeve (2), and the inner wall of the expansion strip (7) is in contact with the first conical surface (5). The upper half of the expansion strip (7) is set as a concave groove surface (8). The groove surface (8) is used to cooperate with the locking hole of the metal shell. The clamping nut (3) is threaded on the second screw (6), and the clamping nut (3) abuts against the end of the expansion sleeve (2) away from the nut block (1). A fixing nut is threaded on the first screw (4), and the fixing nut is used to fix the nut block (1) on the external support structure.

2. The locking and fixing structure for anodizing a metal casing according to claim 1, characterized in that: The clamping nut (3) has a second conical surface (10) at one end near the expansion sleeve (2), and the second conical surface (10) is in contact with the inner wall of the lower end of the expansion sleeve (2).

3. The locking and fixing structure for anodizing a metal casing according to claim 1, characterized in that: The nut block (1), the first screw (4), and the second screw (6) are an integral structure.

4. The locking and fixing structure for anodizing a metal casing according to claim 1, characterized in that: The expansion bar (7) has a guide slope on the inner wall of the end near the nut block (1).

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