Hanging rod capable of assisting in hole inner surface treatment and working method of hanging rod

Abstract

The invention discloses a hanging rod capable of assisting in hole inner surface treatment and a working method of the hanging rod. The hanging rod comprises a screw rod body, and the screw rod body comprises a threaded section and a butt joint end arranged at the tail of the threaded section; the nut is matched with the threaded section, and the outer contour of the nut is provided with a counter-locking end; wherein the contours of the counter-locking end and / or the butt-joint end are non-circular sections. The electric conduction stability and the loading capacity are improved in a screw locking hole mode, stable contact between the hanging rod and the hole wall can be guaranteed, enough gaps can be formed between contact points for circulation of processing liquid, the problems of unstable hanging and loading limitation in the prior art are solved, the hanging device can adapt to products of different weights and specifications, and the application range is wide. And the reliability and applicability of mounting and hanging are improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy vacuum component manufacturing, in particular to a hanging rod that can be used to assist in hole inner surface treatment and a working method thereof. Background Art

[0002] The surface of aluminum alloy vacuum parts needs to be anodized. There are no threaded holes in the product design structure, and there are no holes for anodizing. Or due to the complex shape and excessive weight of the product, there are no suitable threaded holes for anodizing. And other through holes on the product need to be anodized. At present, more and more products that need anodizing do not have threaded holes, and other holes need to be anodized. The mounting screws used in the past have no problem with conductivity, but oxidation in the hole is not possible. For example, a Chinese patent disclosed an anodizing process for an extra-long aluminum alloy profile, application number CN202311569365.1, includes docking a hanging device at a hanging position to clean impurities on the surface of the material rod; fixing the two ends of the aluminum alloy profile to the material rods on both sides of the hanging device with oxidation fixing clamps; using a polyurethane fixing belt to bind and fix the middle part of the aluminum alloy profile to the material rod in the center of the hanging device; moving the hanging device and sending it into a degreasing tank for acid degreasing; the aluminum alloy profile after degreasing is sequentially washed with water, alkali etching, neutralized, washed with water, anodized, washed with water, colored, washed with water, sealed, and dried; removing the polyurethane fixing belt and the oxidation fixing clamp to obtain an aluminum alloy profile with an aluminum oxide film on the surface; observing the aluminum oxide film and detecting the film thickness.

[0003] Although the above scheme uses polyurethane fiber rope instead of traditional aluminum wire, it does not affect the anodizing reaction on the surface of the aluminum alloy profile. The surface of the aluminum alloy profile after the reaction is smooth and tidy without black spots and marks. However, it still cannot solve the problem of lack of suitable hanging points for products without threaded holes or complex shapes. Summary of the invention

[0004] In order to overcome the problem of lack of suitable mounting points in traditional anodizing treatment, especially for products without threaded holes or with complex shapes and excessive weight, the hanging rod design of the present invention improves the conductive stability and load-bearing capacity through the screw lock hole method, solves the problems of unstable mounting and load-bearing limitation in the prior art, enables it to adapt to products of different weights and specifications, and improves the reliability and applicability of mounting.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A hanging rod that can be used to assist in surface preparation inside a hole, comprising: A screw body, the screw body comprising a threaded section and a butt end arranged at the tail of the threaded section; A nut, matched with the threaded section, and having an outer contour provided with a locking end; Wherein, the outer contour of the locking end and / or the butt joint end is a non-circular cross-section.

[0006] The non-circular cross-section is used to form an irregular gap when in contact with the hanging hole, allowing the treated liquid to flow without affecting the stability of the hanging rod. The reason for the technical setting is to solve the problem that the traditional circular hanging rod cannot take into account both stability and liquid flow when treating the inner surface of the hole. The non-circular design can not only ensure the stable contact between the hanging rod and the hole wall, but also form a sufficient gap between the contact points for the treated liquid to flow, thereby achieving uniform treatment of the inner surface of the hole. Compared with the common circular hanging rod, this design significantly improves the efficiency and quality of the inner surface treatment of the hole. Technicians can further optimize the specific shape of the non-circular cross-section, such as using a spiral or wavy outer profile, which can not only increase the turbulence effect of liquid circulation and improve the uniformity of treatment, but also may provide additional mechanical locking effects in certain specific applications.

[0007] Preferably, the outer contour of the butt end is any one of an ellipse, a polygon or a multi-edged shape, and the maximum outer diameter of the butt end is greater than the outer diameter of the threaded section, forming an annular gap. A specific geometric structure is created by a non-circular outer contour and size differences to achieve multiple functions. The non-circular outer contour can increase the contact area between the butt end and the inner wall of the hanging hole, improve the mounting stability and conductivity; the design that the maximum outer diameter of the butt end is greater than the outer diameter of the threaded section forms an annular gap, which provides a channel for the circulation of the treated liquid and solves the problem that the traditional hanging rod is difficult to achieve surface treatment inside the hole; the diverse outer contour shape selection increases the applicability of the hanging rod, and the best matching outer contour shape can be selected according to different hanging hole shapes and processing requirements, which improves the mounting stability and conductivity of the hanging rod, realizes effective treatment of the inner surface of the hole, reduces the impact of the mounting point on the product, and improves the load-bearing capacity and service life of the hanger. Compared with the common cylindrical hanging rod, this design significantly improves the effect and efficiency of the surface treatment inside the hole while ensuring stability.

[0008] Preferably, the cross-sectional area of ​​the opening gradually decreases in the direction away from the butt end to form a tapered channel. The tapered channel is used to adjust the flow characteristics of the medicine. The two main aspects are fluid dynamics and chemical reaction kinetics. The cross-sectional area of ​​the opening gradually decreases in the direction away from the butt end to form a tapered channel. As the cross-sectional area of ​​the channel decreases, the flow rate increases, which helps to enhance the fluidity and stirring effect of the medicine in the hole. The tapered channel can improve the circulation efficiency of the medicine in the hole and optimize the contact between the medicine and the inner surface of the hole; and the change in flow rate can achieve a self-cleaning effect, reduce the risk of clogging, and extend the service life. At the same time, it can adapt to hanging holes of different depths and diameters.

[0009] Preferably, the screw body is made of a conductive material, the butt end and the threaded section are reserved as conductive areas, and the rest of the screw body surface is coated with an insulating material. The screw body is made of a conductive material, and conductivity is retained in a specific area, while the purpose of corrosion protection and precise conduction is achieved by coating the surface with an insulating material. Considering both electrical performance and chemical stability, the screw body is made of a conductive material to ensure good current conduction performance. According to Ohm's law V=IR, a low resistance R can obtain a higher current I at the same voltage V, thereby improving the efficiency of anodizing. At the same time, insulating materials are coated on some areas of the screw surface, and only the conductive areas are retained at the butt end and the threaded section. This design accurately controls the current conduction path and avoids unnecessary current loss and side reactions. The surface-coated insulating material also improves the corrosion resistance of the hanging rod and extends its service life. Compared with the common fully conductive hanging rod, this design has the advantages of precise conduction, corrosion protection, safety, and energy consumption optimization.

[0010] Preferably, the butt end is provided with a plurality of protrusions evenly distributed along the circumference, and the protrusions form multi-point contact with the inner wall of the hanging hole. The multi-point contact increases stability while retaining enough space for the flow of the treated liquid. The mounting stability of the hanging rod and the hanging hole is improved; sufficient conductivity is ensured; while ensuring stability, sufficient space is reserved for the flow of the treated liquid. Thereby, the mounting stability and conductivity of the hanging rod are significantly improved; effective treatment of the inner surface of the hole is achieved, avoiding the problem that the traditional hanging rod cannot treat the inner surface of the hole; by controlling the contact length of each protrusion with the inner wall of the hanging hole (not exceeding 2mm), the influence of the mounting point on the product is reduced. Compared with the common continuous contact design, this multi-point contact design significantly improves the effect and efficiency of the inner surface treatment of the hole while ensuring stability and conductivity. The shape and distribution of the protrusions can also be further optimized, such as designing protrusions of different heights or angles to adapt to hanging holes of different diameters and shapes, thereby improving the versatility of the hanging rod.

[0011] Preferably, a hollow cavity is provided inside the screw body, and the hollow cavity is connected to the opening to form a through circulation channel. The fluidity of the liquid medicine inside the hanging rod is enhanced by the hollow cavity and the through circulation channel. The hollow cavity is provided inside the screw body, and this structure can significantly increase the circulation space of the liquid medicine. According to the continuity equation: Q = A 1 v 1 =A 2 v 2; Wherein, Q is the volume flow rate, A is the cross-sectional area, and v is the flow rate. The hollow design increases the A value, which can reduce the flow rate while maintaining the flow rate, which is conducive to the uniform distribution of the liquid medicine. Secondly, the hollow cavity is connected to the opening to form a through circulation channel. This design ensures that the liquid medicine can flow from one end of the hanging rod to the other end to achieve full coverage. Compared with the common solid hanging rod, this hollow through design has the following advantages: 1. Improve the circulation efficiency of the liquid medicine and ensure that the inner surface of the hole is fully in contact with the liquid medicine; 2. Enhance the uniformity of the reaction and improve the quality of anodizing treatment; 3. Reduce the consumption of liquid medicine and improve the efficiency of resource utilization; 4. Reduce the weight of the hanging rod for easy operation and installation. Those skilled in the art can also use computational fluid dynamics (CFD) technology to optimize the specific parameters of the hollow cavity and the circulation channel. This design not only solves the problem of uneven oxidation in the pores in the prior art, but also provides a new idea for improving the efficiency and quality of anodizing treatment.

[0012] Preferably, the threaded section is connected to the screw body by a thread, so that the length of the threaded section is adjustable. The stability and functionality of the hanging rod are ensured by precise installation steps and torque control. First, select a suitable screw according to the hanging hole to ensure that the threaded part is longer than the hole depth of 5mm. This design takes into account the relationship between the thread engagement length and strength in the principle of mechanics. Secondly, use sandpaper to modify the chamfer of the hanging hole to remove sharp edges and burrs. This step can increase the contact area and reduce stress concentration. Finally, the best locking effect is achieved by precisely controlling the rotation angle of the nut (30°-60°). This design takes into account the relationship between torque and preload. By controlling the rotation angle, the preload can be precisely adjusted to ensure stability while avoiding over-tightening. Compared with the common simple tightening method, this precisely controlled installation method has the advantages of high hanging stability, good liquid flow, optimized hanging points, easy operation and strong adaptability.

[0013] Preferably, the surface of the butt end is provided with a micron-level concave-convex structure to increase the contact area with the inner wall of the hanging hole. The contact stress distribution is optimized and the surface damage is reduced by a carefully designed R-angle structure. The reasons for the technical setting mainly consider three aspects: stress distribution, surface protection and mounting stability. First, secondly, the R-angle design avoids scratches on the edge of the hole by sharp edges and prevents the protrusions on the edge of the hole from affecting the dimensional accuracy of the hole. This design takes into account the surface contact mechanics, and the contact stress distribution can be analyzed by Hertz contact theory. Finally, the length of the threaded part is adjusted according to the depth of the hanging hole, which ensures sufficient engagement length and improves the mounting stability. Compared with the existing technology, this design has the advantages of stable mounting, avoiding the risk of burns, good fluidity of the liquid in the hole, and reduced hanging point size. When the screw and the nut are locked, the contact position with the chamfer of the hole is processed into an R angle. This design can significantly reduce stress concentration.

[0014] The present application also discloses a method for using a single-wire cutting device using the above-mentioned hanging rod, comprising the following steps: (1) selecting a hanging rod of suitable specifications according to the weight of the workpiece to be processed and the diameter of the hanging hole; (2) modifying the chamfer of the selected hanging hole with sandpaper to remove sharp edges and burrs; (3) passing the butt end of the screw through the hanging hole and resting against the chamfer position of the hole edge; (4) screwing the locking end of the nut into the threaded section until the locking end of the nut also contacts the chamfer of the hanging hole; (5) rotating the nut 30°-60° and tightening it lightly with a wrench by hand; and (6) performing surface treatment.

[0015] The method ensures the stability and functionality of the hanging rod through precise installation steps. First, a hanging rod of appropriate specifications is selected according to the weight of the workpiece to be processed and the diameter of the hanging hole to ensure that the hanging rod can bear the weight of the workpiece and match the hanging hole. Secondly, the chamfer of the hanging hole is modified by sandpaper to remove sharp edges and burrs. This step helps to reduce damage to the workpiece during installation and provide a better contact surface for the hanging rod. Next, the butt end of the screw is passed through the hanging hole and against the chamfer position of the hole edge, so as to ensure the correct positioning of the hanging rod in the hanging hole. Then, the locking end of the nut is screwed into the threaded section until the locking end of the nut also contacts the chamfer of the hanging hole. This step realizes the preliminary fixation of the hanging rod and the workpiece. In order to achieve the best hanging effect, the nut needs to be rotated 30°-60° and tightened by hand with a wrench. This precise adjustment ensures the stability of the hanging rod and leaves enough circulation space for the treatment liquid. Finally, surface treatment is performed. At this time, the treatment liquid can flow into the inside of the hanging hole through the gap structure formed by the butt end of the screw and the locking end of the nut, so as to achieve effective treatment of the inner surface of the hole.

[0016] Furthermore, during the surface treatment process, the treatment liquid flows into the inside of the hanging hole through the gap structure formed by the butt end of the screw and the locking end of the nut. A special geometric structure is used to create a liquid flow channel while maintaining the stability of the hanging rod, so as to achieve effective treatment of the inner surface of the hole, overcoming the limitation that the traditional hanging rod cannot treat the inner surface of the hole; ensuring the uniform flow of the treatment liquid and improving the quality and efficiency of the surface treatment; while ensuring stability and conductivity, achieving dual functions. This solution significantly improves the effect of the inner surface treatment of the hole, solves the problem of being unable to treat the inner surface of the hole in the past; improves the uniformity of the surface treatment and improves the product quality; and increases the versatility of the hanging rod, so that it can assist in completing the surface treatment while maintaining a stable hanging function.

[0017] This solution has the following beneficial effects: The special structure formed by the butt end of the screw and the locking end of the nut realizes the surface treatment inside the hanging hole, which solves the problem that the traditional hanging rod cannot treat the inner surface of the hole and improves the quality and integrity of the overall anodizing of the product.

[0018] The docking end and locking end with non-circular outer contour design increase the contact area with the inner wall of the hanging hole, while retaining sufficient liquid circulation space, which not only improves the installation stability and conductive performance, but also ensures the uniform circulation of the treated liquid.

[0019] The length of the threaded section of the screw body can be adjusted according to the depth of the hanging hole. With the different optional specifications, the hanging rod can be suitable for products of various weights and sizes, which greatly improves the versatility and load-bearing capacity of the hanger and solves the problem of load-bearing limitations of traditional hangers.

[0020] Through the carefully designed R angle structure and multi-point contact protrusions, the impact of the mounting points on the product is reduced, avoiding damage to the edge of the hole, while ensuring sufficient conductivity, meeting the balance between appearance requirements and functional requirements.

[0021] The selection of highly corrosion-resistant titanium alloy materials combined with optimized structural design significantly extends the service life of the hanger, reduces the replacement frequency, improves production efficiency and reduces long-term use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is an exploded view of the present invention.

[0024] Figure 3 It is the front view of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the screw body in Example 2.

[0026] Figure 5 This is a schematic diagram of the assembly of the screw body in Example 2.

[0027] In the figure: 1 screw body, 11 threaded section, 12 butt end, 2 nut, 21 locking end, 3 hanging hole, 4, opening, 5 R angle. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0029] Example 1 like Figure 1 , 2As shown, the present invention proposes a hanging rod that can be used to assist in the treatment of the inner surface of the hole. From the overall structure, the overall structure of the hanging rod is mainly composed of a screw body 1 and a nut 2, wherein the screw body includes a threaded section 11 and a butt end 12 arranged at the tail, and the nut cooperates with the threaded section and is provided with a locking end 21. The non-circular outer profile design of the butt end and the locking end can be elliptical, polygonal or multi-blade, and the maximum outer diameter of the butt end is greater than the outer diameter of the threaded section to form an annular gap. A specific geometric structure is created by a non-circular outer profile and size differences to achieve multiple functions. In this embodiment, an elliptical structure is adopted.

[0030] The working principle of the hanging rod in this embodiment is as follows: First, the non-circular outer profile design increases the contact area between the butt end and the inner wall of the hanging hole 3, improving the stability of the hanging and the conductive performance. This multi-point contact design can make the hanging rod more firmly fixed in the hole, reducing the risk of shaking and falling off. Secondly, the design that the maximum outer diameter of the butt end is larger than the outer diameter of the threaded section forms an annular gap, which provides a channel for the circulation of the treated liquid. This solves the problem that it is difficult for traditional hanging rods to achieve surface treatment in the hole, so that the treated liquid can flow into the hole through these gaps to achieve comprehensive surface treatment.

[0031] In addition, the material of the screw body is titanium alloy. This material selection significantly improves the corrosion resistance of the hanging rod, allowing it to be used for a long time in highly corrosive environments such as anodizing without being corroded and oxidized by the solution, thereby greatly extending the service life of the hanger. This design not only solves the problem of mounting stability, but also cleverly realizes the surface treatment inside the hole, while taking into account multiple aspects such as the size of the hanging point, load capacity and service life, providing a comprehensive solution for surface treatment processes such as anodizing. From a theoretical point of view, the design of the hanging rod also involves the principles of fluid mechanics and material mechanics. The design of the annular gap utilizes the capillary phenomenon and surface tension principle in fluid mechanics, so that the treatment liquid can effectively penetrate into a small space. We can use the capillary rise height formula to describe this phenomenon: h=ρgr2γcosθ Where h is the height of the liquid rise, γ is the surface tension of the liquid, θ is the contact angle, ρ is the liquid density, g is the acceleration of gravity, and r is the capillary radius. By optimizing the size of the annular gap, the penetration capacity of the treated liquid can be maximized.

[0032] In terms of material mechanics, the design of the non-circular outer profile increases the contact area between the hanging rod and the hole wall, improving the friction and fixing ability. According to Coulomb's friction law: F=μN Among them, F is the friction force, μ is the friction coefficient, and N is the normal pressure. By increasing the contact area, the normal pressure N can be increased, thereby increasing the friction force F and achieving a more stable mounting effect.

[0033] In addition, the design also takes into account the principle of mechanical balance. When the hanging rod bears the weight of the workpiece, the multi-point contact of the non-circular outer profile can disperse the pressure more evenly, reduce stress concentration, and improve the overall load-bearing capacity. This can be described by the stress distribution formula: σ=AF Among them, σ is stress, F is force, and A is the area under force. By increasing the contact points and area, the local stress can be reduced and the bearing capacity of the hanging rod can be improved.

[0034] like Figure 3 As shown, from a process perspective, the method of using the hanging rod is as follows, including selecting a hanging rod of appropriate specifications according to the weight of the workpiece to be processed and the diameter of the hanging hole, modifying the chamfer of the hanging hole with sandpaper, removing sharp edges and burrs, passing the butt end of the screw through the hanging hole and against the chamfer position of the hole edge, screwing the locking end of the nut into the threaded section until the locking end of the nut also contacts the chamfer of the hanging hole, and finally rotating the nut 30°-60° and tightening it with a wrench by hand. This precise installation and adjustment process ensures the stability of the hanging rod while leaving enough circulation space for the treated liquid.

[0035] The advantages of this hanging rod design are also reflected in its versatility and adaptability. The diverse outer shape options (oval, polygonal, multi-edged) increase the applicability of the hanging rod, and the best matching outer shape can be selected according to different hanging hole shapes and processing requirements. At the same time, the length of the threaded section of the screw body can be adjusted according to the depth of the hanging hole. With the different optional specifications, the hanging rod is suitable for products of various weights and sizes, greatly improving the versatility and load-bearing capacity of the hanger.

[0036] In theory, there is room for further optimization of the design. For example, one can consider designing a deformable docking end that can adaptively adjust according to the shape of different hanging holes to achieve better fit and processing effects. This adaptive design can draw on the concept of smart materials, such as shape memory alloys (SMA) or piezoelectric materials, so that the docking end can automatically adjust its shape according to the external environment. Another possible optimization direction is to add microstructures, such as microgrooves or micropores, to the surface of the docking end to further enhance liquid fluidity and processing uniformity. This microstructure design can use the principles of microfluidics to optimize the flow characteristics of liquids in tiny spaces.

[0037] In practical applications, first of all, the operator needs to select the appropriate hanging rod according to the weight of the workpiece to be processed and the diameter of the hanging hole. Because the correct hanging rod specifications directly affect the stability and load-bearing capacity of the installation. For example, for a workpiece weighing 10kg, it is recommended to select a hanging hole with a diameter of not less than 8mm and use an M6 screw to ensure sufficient load-bearing capacity.

[0038] After choosing the right hanging rod, the next step is to prepare the surface of the workpiece. Use fine sandpaper to carefully chamfer the hanging holes and remove any sharp edges and burrs. This step not only reduces potential damage to the workpiece during installation, but also provides a better contact surface for the hanging rod and improves the stability of the installation. Pay attention to the intensity control during the modification to avoid excessive sanding that affects the hole size.

[0039] Next is the installation process of the hanging rod. Pass the butt end of the screw through the hanging hole so that it touches the chamfer of the hole edge. Pay special attention to the positioning of the butt end to ensure that it forms a good contact with the hole wall. Then, screw the locking end of the nut into the threaded section until the locking end of the nut also contacts the chamfer of the hanging hole. During this process, the operator should feel the change in resistance of the nut to determine whether the appropriate tightening degree has been achieved.

[0040] The last step is fine adjustment. Rotate the nut another 30°-60° and tighten it gently with a wrench. This step requires the operator to have a certain amount of experience and touch to ensure that the screw can be mounted firmly and leave enough circulation space for the treated liquid. Too tight may affect the liquid circulation, while too loose may cause unstable mounting.

[0041] In this embodiment, although the hanging rod is made of corrosion-resistant titanium alloy material, the integrity of the hanging rod still needs to be checked regularly in extreme pH or high temperature environments. It is possible to consider using a pH monitor and a temperature sensor to monitor the processing environment in real time, and to adjust or replace the hanging rod in time when the environmental parameters exceed the preset threshold. In addition, the gap structure formed by the docking end and the locking end can be further optimized to improve the efficiency of liquid circulation. It is possible to consider using computational fluid dynamics (CFD) software to simulate the liquid flow under different gap structures to find the optimal gap shape and size. In order to ensure the uniformity of the surface treatment inside the hole, it is possible to consider slightly rotating the hanging rod during the installation process so that the treated liquid can contact the inner surface of the hole more evenly. The minimum rotation angle can be calculated by the following formula: θ min =360° / n, where n is the number of protrusions at the butt end.

[0042] In production practice, for workpieces with complex shapes, it may be necessary to design a combination of multiple hanging rods at different angles to ensure that the workpiece remains stable during processing. At this time, you can consider using 3D modeling software to simulate the center of gravity distribution of the workpiece.

[0043] Another potential application scenario is automated production lines. An automatic loading and unloading system can be designed to identify the location of the workpiece's hanging holes through machine vision, automatically select the appropriate hanging rod, and complete the installation. This system can greatly improve production efficiency, especially when processing large quantities of workpieces with similar shapes.

[0044] Example 2 like Figure 4 , 5 As shown, in this embodiment, the overall structure of the new hanging rod is still based on the principle of screw lock hole, but a multi-blade design is adopted at the butt end. This design consists of 3-6 arc-shaped blades, each of which is 2-3mm wide and 5-7mm long. The blades are arranged radially to form a circular structure with a diameter slightly smaller than the diameter of the hanging hole. The edge of each blade is finely R-angled (R value is 0.3-0.5mm) to avoid scratching the hole wall. This design not only ensures a firm contact between the hanging rod and the hole wall, but also leaves ample space between the blades, allowing the liquid medicine to flow freely in the hole.

[0045] In terms of material selection, this embodiment uses titanium aluminum alloy (Ti-6Al-4V) as the main material of the hanging rod. This alloy has an excellent strength-to-weight ratio and excellent corrosion resistance. Its tensile strength can reach 900-1200MPa, which is much higher than ordinary titanium alloy and can meet the demand for greater load. At the same time, the density of titanium aluminum alloy is about 4.43g / cm 3 , than pure titanium (4.51g / cm 3 ) is lighter, which helps to reduce the burden on operators. In addition, a dense oxide film will form on the surface of titanium aluminum alloy, which further enhances its corrosion resistance and enables the hanging rod to remain stable for a long time in acidic or alkaline anodizing solution.

[0046] In order to further improve the performance of the hanging rod, the present embodiment adopts plasma spraying technology on the surface of the titanium aluminum alloy to spray a layer of aluminum oxide (Al2O3) with a thickness of 50-100 μm. 2 O 3 ) ceramic coating. This coating not only further enhances the corrosion resistance of the hanging rod, but also improves its surface hardness (up to 1500-2000HV), reducing wear during use. The thermal expansion coefficient of the alumina coating (about 8×10 -6 / K) and titanium aluminum alloy matrix (about 9×10 -6 / K) is close, which can effectively avoid the coating peeling problem caused by thermal expansion mismatch during temperature changes.

[0047] The threaded part of the hanging rod adopts a special trapezoidal thread design with a pitch of 1.5mm and a thread angle of 30°. Compared with the traditional triangular thread, this design has a larger contact area and higher load-bearing capacity. According to the thread strength calculation formula: F = π·d·H·p·[σ], where F is the axial load, d is the major diameter of the thread, H is the effective height of the thread, p is the pitch, and [σ] is the allowable stress, it can be concluded that the thread load-bearing capacity of this design is about 20% higher than that of ordinary threads of the same size.

[0048] In order to adapt to hanging holes of different depths, this embodiment designs a threaded section with adjustable length. By setting a hollow section in the middle of the screw rod and screwing the screw rod to the hollow section, the length adjustment of ±10mm can be achieved. This design greatly increases the applicable scope of the hanging rod, so that the same hanging rod can be used for hanging holes with large differences in depth.

[0049] In this embodiment, the cross-sectional area of ​​the opening 4 gradually decreases in the direction away from the docking end 12 to form a tapered channel. The tapered channel is used to adjust the flow characteristics of the medicine. The two main aspects are fluid dynamics and chemical reaction kinetics. The cross-sectional area of ​​the opening gradually decreases in the direction away from the docking end to form a tapered channel. As the cross-sectional area of ​​the channel decreases, the flow rate increases, which helps to enhance the fluidity and stirring effect of the medicine in the hole. The tapered channel can improve the circulation efficiency of the medicine in the hole and optimize the contact between the medicine and the inner surface of the hole; and the change in flow rate can achieve a self-cleaning effect, reduce the risk of blockage, and extend the service life. At the same time, it can adapt to hanging holes of different depths and diameters. In actual application, the use process of the new hanging rod of this embodiment involves multiple steps, each of which is carefully designed to optimize performance and processing effects. First, the operator needs to select a hanging rod of appropriate specifications according to the weight of the workpiece to be processed and the diameter of the hanging hole. This step takes into account the relationship between the thread engagement length and the strength to ensure sufficient hanging strength. For example, for products weighing about 15kg, it is recommended to select a hanging hole with a diameter ≥10mm and use a titanium-aluminum alloy hanging rod of M8 specification. When selecting a hanging rod, the material properties of the workpiece and the anodizing process parameters must also be considered to ensure that the hanging rod can withstand the mechanical and chemical stresses during the entire treatment process. Next, the selected hanging hole is modified using fine-mesh sandpaper (such as 1000 mesh). This step is intended to remove burrs or irregularities that may exist on the edge of the hole to ensure good contact between the hanging rod and the hole wall. The surface roughness of the modified hole should be controlled within Ra 0.8μm, which can be achieved by gradually fine-grinding with sandpaper of different meshes. Inserting the petal-shaped butt end of the hanging rod into the hanging hole of the workpiece is the next key step. During insertion, the axis should be aligned to avoid oblique insertion causing jamming or damage to the hole wall. To ensure a smooth insertion process, a small amount of food-grade silicone oil can be applied to the butt end, which not only reduces friction but can also be completely removed in subsequent processing without affecting the anodizing effect. Rotate the hanging rod so that the threaded section engages with the hanging hole thread until the butt end contacts the inner wall of the hanging hole. During this process, the operator needs to pay close attention to the data of the pressure sensor integrated on the hanging rod. The ideal contact pressure should be in the range of 0.5-1.0MPa, which can be achieved by adjusting the rotation angle. Excessive pressure may cause deformation of the hole wall, while too low pressure cannot ensure stable contact. During installation, special attention should be paid to the R angle of the contact between the hanging rod and the hole wall. This design (R value of 0.3-0.5mm) significantly reduces stress concentration and reduces damage to the hole edge. After installation, use a magnifying glass or portable microscope to check whether the R angle is intact. If any abnormality is found, the hanging rod should be replaced immediately. For bendable hanging rods with shape memory alloy core wire, preheating treatment is required before use. The hanging rod can be immersed in hot water at 60-70℃ for 1-2 minutes, or a current of 1-2A can be applied to it for about 30 seconds through a specific heating device. After preheating, the operator can bend the hanging rod into the desired shape according to the shape of the inner cavity of the workpiece. When bending, care should be taken not to exceed the elastic limit of the hanging rod material, and the bending angle should generally not exceed 90°. After bending, the hanging rod is cooled to room temperature to fix the shape. In actual production, in order to improve efficiency, a series of hanging rods with different bending shapes can be prepared in advance to adapt to various complex inner cavity structures. For large or complex-shaped workpieces, it may be necessary to use multiple hanging rods for simultaneous hanging. In this case, the position of each hanging rod needs to be carefully planned to ensure uniform current distribution. Finite element analysis software can be used to simulate the current distribution and optimize the arrangement of the hanging rods.For example, for the inner wall treatment of a spherical container with a diameter of 1 meter, 5-7 hanging rods may be needed, evenly distributed on the spherical surface. After the hanging rods are installed, conductivity testing is required. Use a high-precision ohmmeter to measure the resistance between the hanging rod and the workpiece, and the ideal value should be less than 0.1Ω. If the resistance value is too high, it may indicate poor contact and the installation of the hanging rod needs to be readjusted. For hanging rods with integrated intelligent sensing systems, various parameters need to be monitored in real time during the anodizing process. The data of the temperature sensor should be kept within the process requirements, usually not exceeding 25°C; the data of the current sensor should remain stable, with fluctuations not exceeding ±5%; the data of the pressure sensor should always remain within the aforementioned 0.5-1.0MPa range. If any parameter is abnormal, the control system will sound an alarm and the operator needs to intervene in time. During the treatment process, in order to ensure the uniformity of the surface treatment in the hole, pulse current technology can be used. By controlling the switching frequency of the current (typically 20-50Hz) and the duty cycle (usually 70-80%), the exchange efficiency of the liquid in the hole can be significantly improved and the treatment uniformity can be improved. For deep hole treatment, a special rod design with a microchannel system can be considered. This design integrates micron-scale fluid channels inside the rod, through which fresh electrolyte is injected into the hole and the reaction products are extracted at the same time, so as to achieve better deep hole treatment effect. After treatment, special care should be taken when removing the rod. First, turn off the power and wait for 5-10 minutes for the electrolyte on the surface of the workpiece to flow down naturally. Then rotate the rod slowly to avoid sudden stress release and damage to the workpiece or the rod. In the case of a bendable rod, it may be necessary to heat it again to soften it so that it can be removed smoothly without damaging the workpiece. After each use, the rod needs to be fully inspected and cleaned. Use a neutral detergent and a soft brush to clean the surface of the rod, paying special attention to cleaning the gaps at the petal-shaped butt ends. Then rinse with deionized water and air dry naturally in a dust-free environment. For rods with integrated sensors, it is also necessary to check whether the functions of each sensor are normal. Regularly (such as after every 100 uses) conduct a comprehensive performance test on the rod, including load capacity, conductivity, elasticity of the elastic connection structure, etc., to ensure that it continues to meet production requirements. Through this strict operating procedure and maintenance system, the new hanging rod system of this embodiment can exert optimal performance in the anodizing treatment of complex workpieces and significantly improve product quality and production efficiency.

Claims

1. A hanging rod that can be used to assist in the surface treatment of a hole, characterized in that: include: A screw body, the screw body comprising a threaded section and a butt end arranged at the tail of the threaded section; A nut, matched with the threaded section, and having an outer contour provided with a locking end; Wherein, the outer contour of the locking end and / or the butt joint end is a non-circular cross-section.

2. The hanging rod according to claim 1, characterized in that: The outer contour of the butt end is any one of an ellipse, a polygon or a multi-edged shape, and the maximum outer diameter of the butt end is larger than the outer diameter of the threaded section, forming an annular gap.

3. The hanging rod according to claim 1 or 2, characterized in that: The cross-sectional area of ​​the butt end gradually increases in a direction away from the threaded section to form a tapered channel.

4. The hanging rod according to claim 1, characterized in that: The screw body is made of conductive material, the butt end and the thread section are reserved as conductive areas, and the rest of the surface of the screw body is coated with insulating material.

5. The hanging rod according to claim 1, characterized in that: The butt end is provided with a plurality of protrusions evenly distributed along the circumferential direction, and the protrusions form multi-point contact with the inner wall of the hanging hole.

6. The hanging rod according to claim 1, characterized in that: A hollow cavity is provided inside the screw body, and the hollow cavity is communicated with the butt end to form a through flow channel.

7. The hanging rod according to claim 1, characterized in that: The threaded section is connected to the screw body through threads, so that the length of the threaded section can be adjusted.

8. The hanging rod according to claim 1, characterized in that: The surface of the butt end is provided with a micron-level concave-convex structure to increase the contact area with the inner wall of the hanging hole.

9. A method for working a hanging rod that can be used to assist in surface treatment of a hole, characterized in that: The method comprises the following steps: (1) selecting a hanging rod of suitable specifications according to the weight of the workpiece to be processed and the diameter of the hanging hole; (2) modifying the chamfer of the selected hanging hole with sandpaper to remove sharp edges and burrs; (3) passing the butt end of the screw through the hanging hole and pressing against the chamfer position of the hole edge; (4) screwing the locking end of the nut into the threaded section until the locking end of the nut also contacts the chamfer of the hanging hole; (5) rotating the nut 30°-60° and tightening it lightly with a wrench by hand; (6) performing surface treatment.

10. The working method according to claim 9, characterized in that: During the surface treatment process, the treatment liquid flows into the hanging hole through the gap structure formed by the butt end of the screw and the locking end of the nut.

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