Fully-sealed column switch shell and surface shot blasting processing technology thereof

Abstract

The invention discloses a fully-sealed column switch shell and a surface shot blasting machining process thereof. The fully-sealed column switch shell comprises a box body and a box cover, and the box body and the box cover are fully sealed by matching a fastener with a sealing piece; the box body and the box cover are integrally cast and formed by adopting ZL104 aluminum alloy, and the surfaces of the box body and the box cover are treated through a composite shot blasting process of'primary shot blasting and secondary shot blasting 'and coated with anti-corrosion paint. Through the composite shot blasting process, the surface appearance is effectively optimized, the adhesive force between the coating and a base body is remarkably improved, the corrosion resistance time of the shell in a neutral salt mist environment is greatly prolonged, the problems that a coating of a traditional column switch shell is prone to falling off and poor in corrosion resistance are solved, and the column switch shell is suitable for being used in outdoor and severe environments.

Description

Technical Field

[0001] This invention belongs to the field of power equipment manufacturing technology, and relates to a fully sealed column-mounted switch housing and its surface shot peening process. Background Technology

[0002] With the rapid pace of power distribution network construction, the requirements for power distribution networks are becoming increasingly stringent. Overhead lines are mostly controlled by pole-mounted switches. Due to the complex outdoor environment, especially in coastal areas where it is humid and rainy with high levels of salt spray in the air, pole-mounted switches suffer from severe corrosion. Summary of the Invention

[0003] Currently, the commonly used pole-mounted switch housing material is stainless steel. The housing is generally sealed using a gasket, and the protection level can only reach IP54, which is a general sealing level. To improve the sealing level of the switch, O-rings can be used. However, due to the large size of the housing, welding the gasket can easily cause deformation of the housing during welding, leading to sealing failure.

[0004] The cast aluminum housing used in this application is integrally cast from a mold, with precise dimensions, high strength, and the smoothness and flatness of the sealing surface can also meet the requirements. The sealing effect can reach IP67 or above, achieving the full sealing requirements of the switch.

[0005] Currently, coating the shell surface with anti-corrosion paint is commonly used to further improve corrosion resistance. However, the smooth surface of aluminum alloy results in low interfacial bonding strength with the coating. Under outdoor temperature cycling and mechanical vibration conditions, the coating is prone to peeling and flaking, causing the shell to lose its protective effect. Shot peening, as a commonly used surface treatment technology, alters the morphology and mechanical properties of the metal surface by impacting it with shot, providing a new approach to improving coating bonding strength. However, shot peening with a single shot diameter can easily lead to sharp protrusions on the surface, which can reduce coating durability. Therefore, the shot peening process needs to be improved based on the specific substrate material.

[0006] Objective: In view of at least one of the above technical problems, the present invention provides a fully sealed column-mounted switch housing and its surface shot peening process. The housing and cover are integrally cast from ZL104 aluminum alloy, and their surfaces are treated by a composite shot peening process of "first shot peening + second shot peening" with specific parameters, and then coated with anti-corrosion coating.

[0007] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows: Firstly, this application provides a fully sealed column-mounted switch housing. It includes a box body and a box cover, which are fully sealed by fasteners and sealing elements; The box body and box cover are integrally cast from ZL104 aluminum alloy, and the surface is treated by a composite shot peening process of "one shot peening + two shot peening" and coated with anti-corrosion coating.

[0008] In some embodiments, the housing is provided with: A lifting handle facilitates lifting the fully sealed column-mounted switch housing; And / or, lifting blocks, for connection to lifting equipment; And / or, mounting studs for threaded connection to external devices; And / or, sign boss, used for mounting sign; And / or, an isolation handle for mounting an isolating switch; And / or, a pole post boss, wherein the pole post boss has a pole post through hole at its center with a size matching that of the external pole post, for installing the external pole post; And / or, a flange boss, used to mount a flange to support a transmission component, and the flange and the flange boss form a sealing connection; And / or, transformer mounting holes for mounting external transformers, and capable of forming a sealed connection via a flange.

[0009] In some embodiments, at the connection between the box body and the box cover, threaded holes are evenly distributed around the box body, and mounting holes are evenly distributed at the corresponding positions on the box cover, for connecting and fixing the box cover and the box body with fasteners.

[0010] In some embodiments, at the junction of the housing, the housing is provided with a sealing groove for installing a seal.

[0011] Furthermore, in some embodiments, the seal is an O-ring.

[0012] In some embodiments, the cover is provided with an openable inflation connector for inflating the fully sealed column switch housing through the inflation connector.

[0013] In some embodiments, the outer side of the box cover is provided with a reinforcing rib structure.

[0014] Secondly, this application provides the surface shot peening process for the aforementioned fully sealed column-mounted switch housing, and the "one-time shot peening + two-time shot peening" composite shot peening process includes: One shot peening: An automatic shot peening machine is used, with the shot peening pressure set to 0.8MPa, the shot peening angle to 90°, and the shot flow rate to 15kg / min. Stainless steel shot with a diameter of 0.5 mm is used to shot peening the surface of the box body and the box cover for a period of time. Secondary shot peening: Maintain the same spray pressure, shot peening angle, spray distance, and shot peening time as the primary shot peening, and replace with stainless steel shot with a diameter of 0.3mm to perform secondary shot peening on the surface of the box body and box cover.

[0015] In some embodiments, after secondary shot peening is completed, the method further includes: The surface of the housing is swept by high-pressure airflow, rinsed with deionized water, ultrasonically cleaned in anhydrous ethanol, and then dried. Then apply an anti-corrosion coating.

[0016] In some embodiments, the anti-corrosion coating is selected from at least one of fluorocarbon coatings, epoxy resin coatings, polyurethane coatings, acrylic coatings, and zinc-based coatings.

[0017] Beneficial Effects: The fully sealed column-mounted switch housing and its surface shot peening process provided by this invention utilize ZL104 aluminum alloy for integral casting of the housing and cover. The surface is treated with a composite shot peening process using specific parameters of "first-stage shot peening + second-stage shot peening," followed by coating with an anti-corrosion coating. This composite shot peening process effectively optimizes the surface morphology, significantly improves the adhesion between the coating and the substrate, and greatly extends the corrosion resistance time of the housing in a neutral salt spray environment. It solves the problems of easy coating peeling and insufficient corrosion resistance in traditional column-mounted switch housings, making it suitable for outdoor and harsh environments and possessing extremely high industrial applicability. It has the following advantages: (1) The present invention provides a fully sealed column-mounted switch housing, which is an integral casting structure, requiring no subsequent welding, avoiding welding deformation, ensuring the airtightness requirements of the product, and the product is maintenance-free for life; (2) The present invention provides a fully sealed column-mounted switch housing, the opening position and size of which can be adjusted according to user requirements to meet the requirements of different configurations; (3) The present invention provides a surface shot peening process. The composite shot peening process forms the optimal morphology of "deep pits + uniform protrusions" on the shell surface. The mechanical interlocking points are increased by more than 40% compared with single shot peening. The coating adhesion reaches level 0 in the cross-cut test, which is 3 times higher than that of the shell without shot peening, thus solving the core problem of easy coating peeling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the first structure of the fully sealed column-mounted switch housing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the second structure of the fully sealed column-mounted switch housing according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the inner structure of the housing of the fully sealed column-mounted switch in an embodiment of the present invention; Figure 4 This is a schematic diagram of the outer structure of the cover of the fully sealed column-mounted switch housing in an embodiment of the present invention; Figure 5 This is a schematic diagram of the inner side structure of the cover of the fully sealed column-mounted switch housing in an embodiment of the present invention.

[0019] In the diagram: 1. Box body; 2. Box cover; 1-1. Lifting handle; 1-2. Pole post boss; 1-3. Lifting block; 1-4. Mounting stud; 1-5. Indicator sign boss; 1-6. Flange boss; 1-7. Current transformer mounting hole; 1-8. Isolation handle; 1-9. Threaded hole; 1-10. Sealing groove; 2-1. Inflation connector; 2-2. Mounting hole; 2-3. Reinforcing rib. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] This application provides a fully sealed on-pillar switch housing, such as... Figures 1 to 5 As shown, the enclosure includes a housing 1 and a lid 2, which are fully sealed using fasteners and sealing components. Both the housing 1 and lid 2 are integrally cast from ZL104 aluminum alloy, and their surfaces are treated with a composite shot peening process of "first shot peening + second shot peening," followed by coating with an anti-corrosion paint. This composite shot peening process effectively optimizes the surface morphology, significantly improves the adhesion between the coating and the substrate, and greatly extends the corrosion resistance time of the housing in a neutral salt spray environment.

[0025] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, the housing 1 is provided with: Lifting handle 1-1 facilitates lifting the fully sealed column-mounted switch housing; Lifting blocks 1-3 are used to connect with lifting equipment; Mounting studs 1-4 are used for threaded connection and installation of external equipment; Signage protrusions 1-5 are used for mounting signage. Isolation handles 1-8 are used to install disconnect switches; when equipped with a disconnect switch, the disconnect switch is fixed to the enclosure using isolation handles 1-8.

[0026] The pole post boss 1-2 has a pole post through hole at its center with a size matching that of the external pole post, for installing the external pole post; Flange boss 1-6 is used to install the flange to support the transmission component, and the flange and flange boss 1-6 form a sealing connection; The instrument transformer mounting holes 1-7 are used to install external instrument transformers and can form a sealed connection through the flange.

[0027] Whether to drill through the current transformer mounting holes 1-7 and the isolation handles 1-8 on the enclosure 1 depends on whether the user requires an external current transformer or a disconnect switch, thus meeting the requirements of different configurations.

[0028] In some embodiments, such as Figure 3 , Figure 4 , Figure 5 As shown, at the connection between the box body 1 and the box cover 2, threaded holes 1-9 are evenly distributed around the box body 1, and mounting holes 2-2 are evenly distributed at the corresponding positions on the box cover 2, for connecting and fixing the box cover 2 and the box body 1 with fasteners.

[0029] In some embodiments, such as Figure 3 As shown, at the connection of the housing 1, the housing 1 is provided with a sealing groove 1-10 for installing the sealing element.

[0030] In this embodiment, it should be noted that the pole post boss 1-2, flange boss 1-6, transformer mounting hole 1-7, and sealing groove 1-10 will all cooperate with corresponding sealing elements to achieve a complete seal of the housing. Furthermore, in this embodiment, the sealing element is an O-ring.

[0031] In this embodiment, the housing 1 and the cover 2 are made of cast aluminum ZL104. The pole post boss 1-2 is provided with a pole post through hole. The shape and size of the pole post through hole correspond to the external pole post. The pole post is installed on the pole post boss 1-2. The sealing ring of the pole post and the pole post boss 1-2 cooperate to form a sealing surface. Various flange bosses 1-6 cooperate with the flange sealing ring used to support the transmission components to form a sealing surface. After the O-ring is placed in the sealing groove 1-10 on the housing 1, it cooperates with the cover 2 to form a sealing surface, thereby achieving the sealing requirements of the housing.

[0032] In some embodiments, such as Figure 4 , Figure 5As shown, the cover 2 is equipped with an openable inflation connector 2-1 for inflating the fully sealed switch housing through the inflation connector 2-1. A leak detection device can perform helium leak testing on the installed enclosure; if the leak meets the standard, inflation can be performed.

[0033] In some embodiments, such as Figure 5 As shown, the outer side of the box cover 2 is provided with reinforcing ribs 2-3. In this embodiment, the reinforcing ribs 2-3 are evenly arranged along the length and width directions of the box cover 2, forming a cross shape.

[0034] This application embodiment also provides a surface shot peening process for the fully sealed column-mounted switch housing, including a "first shot peening + second shot peening" composite shot peening process: One shot peening: An automatic shot peening machine is used, with the shot peening pressure set to 0.8MPa, the shot peening angle to 90°, and the shot flow rate to 15kg / min. Stainless steel shot with a diameter of 0.5 mm is used to shot peening the surfaces of the box body 1 and the box cover 2 for a period of time. Secondary shot peening: Maintain the same spraying pressure, shot peening angle, spraying distance, and shot peening time as the primary shot peening, and replace with stainless steel shot with a diameter of 0.3mm to perform secondary shot peening on the surfaces of the housing 1 and the housing cover 2.

[0035] In some embodiments, after secondary shot peening is completed, the method further includes: The shell surface is swept with high-pressure airflow, rinsed with deionized water, ultrasonically cleaned in anhydrous ethanol, and then dried; then an anti-corrosion coating is applied.

[0036] In some embodiments, the anti-corrosion coating is selected from at least one of fluorocarbon coatings, epoxy resin coatings, polyurethane coatings, acrylic coatings, and zinc-based coatings.

[0037] In this embodiment, the outer surface of the processed shell is shot-peened using an automatic shot-peening machine. The shot peening pressure is set to 0.8 MPa, the shot peening angle to 90°, and the shot flow rate to 15 kg / min. Stainless steel shot is selected as the shot medium, and 0.5 mm diameter shot is used to shot-peen the surface of the housing and lid for 4 minutes. Maintaining the same shot pressure, angle, shot distance, and shot peening time as the first shot peening, the shot is replaced with 0.3 mm diameter stainless steel shot for a second shot peening of the housing and lid. After the second shot peening, a high-pressure airflow is used to blow away residual shot and dust from the shell surface. The surface is then rinsed with deionized water, ultrasonically cleaned in anhydrous ethanol, and then dried. The surface coating can be a fluorocarbon coating, epoxy resin coating, polyurethane coating, acrylic coating, or zinc-based coating. In this embodiment, the anti-corrosion coating uses a two-component solvent-based MX-1 type epoxy zinc-rich paint as an example. The main agent is E-20 type epoxy resin as the film-forming base material, containing ≥80% of 10μm atomized zinc powder by dry film mass. The curing agent is 650 type low molecular weight polyamide. The main agent and curing agent are mixed in a mass ratio of 10:1 to form a three-dimensional cross-linked structure coating. After spraying, the sample is placed in an oven at 80°C and dried for 30 minutes.

[0038] The embodiments of this application utilize the above-described surface shot peening process. The composite shot peening process creates an optimal morphology of "deep pits + uniform protrusions" on the shell surface. The mechanical interlocking points increase by more than 40% compared to single shot peening. The coating adhesion reaches level 0 in the cross-cut test, which is 3 times higher than that of the unpeened shell, thus solving the core problem of easy coating peeling.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fully sealed column-mounted switch housing, characterized in that, It includes a box body and a box cover, which are fully sealed by fasteners and sealing elements; The box body and box cover are integrally cast from ZL104 aluminum alloy, and the surface is treated by a composite shot peening process of "one shot peening + two shot peening" and coated with anti-corrosion coating.

2. The fully sealed column-mounted switch housing according to claim 1, characterized in that, The box is equipped with: A lifting handle facilitates lifting the fully sealed column-mounted switch housing; And / or, lifting blocks, for connection to lifting equipment; And / or, mounting studs for threaded connection to external devices; And / or, sign boss, used for mounting sign; And / or, an isolation handle for mounting an isolating switch; And / or, a pole post boss, wherein the pole post boss has a pole post through hole at its center with a size matching that of the external pole post, for installing the external pole post; And / or, a flange boss, used to mount a flange to support a transmission component, and the flange and the flange boss form a sealing connection; And / or, transformer mounting holes for mounting external transformers, and capable of forming a sealed connection via a flange.

3. The fully sealed column-mounted switch housing according to claim 1, characterized in that, At the connection between the box body and the box cover, threaded holes are evenly distributed around the box body, and mounting holes are evenly distributed at the corresponding positions on the box cover, for connecting and fixing the box cover and the box body with fasteners.

4. The fully sealed column-mounted switch housing according to claim 1, characterized in that, At the connection point of the housing, the housing is provided with a sealing groove for installing seals.

5. The fully sealed column-mounted switch housing according to claim 4, characterized in that, The sealing element uses an O-ring.

6. The fully sealed column-mounted switch housing according to claim 1, characterized in that, The cover is equipped with an openable inflation connector for inflating the fully sealed column switch housing with air through the inflation connector.

7. The fully sealed column-mounted switch housing according to claim 1, characterized in that, The outer side of the box cover is equipped with a reinforcing rib structure.

8. The surface shot peening process for the fully sealed column-mounted switch housing according to any one of claims 1-7, characterized in that, The combined shot peening process of "single shot peening + double shot peening" includes: One shot peening: An automatic shot peening machine is used, with the shot peening pressure set to 0.8MPa, the shot peening angle to 90°, and the shot flow rate to 15kg / min. Stainless steel shot with a diameter of 0.5 mm is used to shot peening the surface of the box body and the box cover for a period of time. Secondary shot peening: Maintain the same spray pressure, shot peening angle, spray distance, and shot peening time as the primary shot peening, and replace with stainless steel shot with a diameter of 0.3mm to perform secondary shot peening on the surface of the box body and box cover.

9. The surface shot peening process for the fully sealed column-mounted switch housing according to claim 8, characterized in that, After the secondary shot peening is completed, the following are also included: The surface of the housing is swept by high-pressure airflow, rinsed with deionized water, ultrasonically cleaned in anhydrous ethanol, and then dried. Then apply an anti-corrosion coating.

10. The surface shot peening process for the fully sealed column-mounted switch housing according to claim 9, characterized in that, The anti-corrosion coating is selected from at least one of fluorocarbon coatings, epoxy resin coatings, polyurethane coatings, acrylic coatings, and zinc-based coatings.

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