Auxiliary anode for chrome plating of inner wall of outer cylinder of main landing gear of Boeing 737 aircraft

Abstract

The utility model discloses an auxiliary anode for plating chromium on the inner wall of an outer cylinder of a main landing gear of a Boeing 737 aircraft, which comprises a conductive copper bar, an insulating top cover, a pictographic anode, an insulating bottom cover and a fastener, the pictographic anode is a hollow cylinder, the side wall of the pictographic anode is provided with a through side plating solution circulation hole, and the side plating solution circulation hole is communicated with the insulating bottom cover. The insulating top cover and the insulating bottom cover are respectively attached to the upper surface and the lower surface of the pictographic anode and are fixedly connected together through a fastener; an upper plating solution circulating hole communicated with a middle hole of the pictographic anode is formed in a position, close to the middle part, of the insulating top cover; an edge plating solution circulation hole communicated with the space of the outer side edge of the pictographic anode is formed in the position, close to the edge, of the insulating top cover, a lower plating solution circulation hole communicated with a middle hole of the pictographic anode is formed in the position, close to the middle, of the insulating bottom cover, and the middle of the pictographic anode and the lower end of the conductive copper bar are cast together. The device is simple to operate and easy to maintain, and the electroplated coating is uniform in thickness and smooth and compact in appearance.

Description

Technical Field

[0001] This utility model belongs to the field of metal surface treatment technology, specifically relating to an auxiliary anode for chrome plating on the inner wall of the outer cylinder of the main landing gear of a Boeing 737 aircraft. Background Technology

[0002] The landing gear is a component that enables aircraft to taxi, take off and land, and support the entire aircraft. The outer cylinder of the landing gear is a major component, and its sealing performance is closely related to the shock absorption performance of the aircraft's shock absorption system. If the landing gear shock absorbers malfunction, the aircraft will be subjected to a large impact force and generate strong turbulence, which is extremely detrimental to the aircraft structure and flight safety.

[0003] The landing gear shock absorbers widely used in aircraft today are hydropneumatic shock absorbers. Their basic components include an outer cylinder, piston, piston rod, perforated diaphragm, and sealing devices. The lower part of the outer cylinder's inner cavity is filled with oil, and the upper part is filled with gas. Hydropneumatic shock absorbers primarily utilize the compression and deformation of the gas to absorb impact kinetic energy and the friction of the oil flowing at high speed through the perforations to dissipate energy. However, over prolonged use, the chromium layer in the sealing area of ​​the landing gear outer cylinder can be damaged, affecting the sealing performance and leading to severe air leakage. To restore the sealing performance of the landing gear outer cylinder, electroplating repair of the chromium layer in the sealing area is necessary. However, since the chromium layer in the sealing area is located in the middle of the outer cylinder's inner cavity, electroplating repair is difficult. Therefore, an auxiliary anode that is easy and quick to install, highly practical, and provides good chromium plating results needs to be designed. Utility Model Content

[0004] The purpose of this invention is to provide an auxiliary anode for chrome plating on the inner wall of the outer cylinder of the main landing gear of a Boeing 737 aircraft.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An auxiliary anode for chrome plating the inner wall of the main landing gear outer cylinder of a Boeing 737 aircraft is characterized by comprising a conductive copper busbar, an insulating top cover, a shaped anode, an insulating bottom cover, and fasteners. The shaped anode is a hollow cylinder with an outer diameter smaller than the inner diameter of the main landing gear outer cylinder. Side plating solution flow holes are provided on the sidewall of the shaped anode. The insulating top cover and the insulating bottom cover are both circular plates, respectively abutting against the upper and lower surfaces of the shaped anode and fixed together by fasteners. The diameters of the insulating top cover and the insulating bottom cover are larger than those of the shaped anode. The outer diameter, the center of the insulating top cover, the insulating bottom cover and the figurative anode are coincident. The insulating top cover has an upper plating solution flow hole near the center that communicates with the central hole of the figurative anode. The insulating top cover has an edge plating solution flow hole near the edge that communicates with the space on the outer side of the figurative anode. The insulating bottom cover has a lower plating solution flow hole near the center that communicates with the central hole of the figurative anode. The middle part of the figurative anode protrudes to the top of the insulating top cover and is cast together with the lower end of the conductive copper busbar. The upper end of the conductive copper busbar is used to connect with the external anode conductive wire.

[0007] Furthermore, a cross-shaped support is provided inside the central hole of the shaped anode, and a reinforcing block is provided on the upper middle part of the cross-shaped support. A through hole is provided in the middle of the insulating top cover, and the reinforcing block passes through the through hole and is cast together with the lower end of the conductive copper busbar.

[0008] Furthermore, the conductive copper is excluded from the upper outer surface, and the remaining outer surfaces are all covered with an insulating varnish layer, as is the outer surface of the reinforcing block.

[0009] Furthermore, the insulating top cover, the cross-shaped bracket, and the insulating bottom cover are respectively provided with an upper connecting hole, a middle connecting hole, and a lower connecting hole. The fastener consists of a bolt, a washer, and a nut. The bolt passes through the lower connecting hole, the middle connecting hole, and the upper connecting hole in sequence. The nut is connected to the tail end of the bolt, and the washer is located on the inner side of the bolt head and the inner side of the nut.

[0010] Furthermore, the lower edge of the insulating bottom cover is machined into a rounded corner.

[0011] Furthermore, the insulating top cover has multiple sets of upper plating solution flow holes, each set of upper plating solution flow holes including three upper plating solution flow holes arranged in a triangle, and the insulating bottom cover has multiple sets of lower plating solution flow holes, each set of lower plating solution flow holes including three lower plating solution flow holes arranged in a triangle.

[0012] Furthermore, the upper end of the conductive copper busbar is provided with an upper end hole for connecting with an external anode conductive wire, and the upper end of the conductive copper busbar is plated with a tin layer.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The auxiliary anode of this invention can be directly inserted into the inner cavity of the main landing gear outer cylinder to perform chromium plating on a designated area. It is simple to operate and easy to maintain. During chromium plating, the plating solution can circulate through the side plating solution flow holes, the upper plating solution flow holes, the edge plating solution flow holes, and the lower plating solution flow holes, which facilitates circulation, ensures good temperature uniformity, and results in a uniform plating thickness and a smooth and dense plating appearance after electroplating. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the auxiliary anode of this utility model in use;

[0016] Figure 2 This is a three-dimensional schematic diagram of the insulating top cover of this utility model;

[0017] Figure 3 This is a three-dimensional schematic diagram of the pictographic anode of this utility model;

[0018] Figure 4 This is a three-dimensional schematic diagram of the insulating bottom cover of this utility model;

[0019] Figure 5 This is a side view of the insulating bottom cover of this utility model.

[0020] Meaning of the labels in the attached diagram:

[0021] 1-Conductive copper busbar; 2-Main landing gear outer cylinder; 2.1-Inner cavity; 2.2-Step; 2.3-Chamfer; 3-Insulating top cover; 3.1-Edge plating solution flow hole; 3.2-Upper plating solution flow hole; 3.3-Upper connecting hole; 3.4-Through hole; 4-Iconic anode; 4.1-Side plating solution flow hole; 4.2-Cross-shaped bracket; 4.3-Middle connecting hole; 4.4-Reinforcing block; 5-Insulating bottom cover; 5.1-Rounded corner; 5.2-Lower plating solution flow hole; 5.3-Lower connecting hole; 6-Nut; 7-Washer; 8-Bolt; 9-Anode conductive wire; 10-Cathode conductive wire. Detailed Implementation

[0022] The present invention will be further described below with reference to embodiments.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Example:

[0027] like Figures 1 to 5 The auxiliary anode shown in this embodiment is used for chrome plating of the inner wall of the main landing gear outer cylinder of a Boeing 737 aircraft. It includes a conductive copper busbar 1, an insulating top cover 3, a figurative anode 4, an insulating bottom cover 5, and fasteners.

[0028] The shaped anode 4 is made of lead-tin alloy and is a hollow cylinder. Its outer surface shape matches the shape of the inner cavity 2.1 of the main landing gear outer cylinder 2. The outer diameter of the shaped anode 4 is smaller than the inner diameter of the main landing gear outer cylinder 2. During electroplating, a gap exists between the outer surface of the shaped anode 4 and the inner wall of the main landing gear outer cylinder 2, preventing contact between them. Figure 3 As shown, the sidewall of the figurative anode 4 is provided with through side plating solution flow holes 4.1. In this embodiment, three side plating solution flow holes 4.1 are grouped together, and a total of four groups of side plating solution flow holes 4.1 are provided. During electroplating, the plating solution inside and outside the figurative anode 4 can flow through the side plating solution flow holes 4.1. The above-mentioned structure of the figurative anode 4 facilitates the circulation of plating solution, increases the effective surface area of ​​the anode, and reduces the weight of the anode.

[0029] A cross-shaped support 4.2 is installed inside the central hole of the figurative anode 4. The cross-shaped support 4.2 reinforces the structure of the figurative anode 4. The four ends of the cross-shaped support 4.2 are integrally connected to the figurative anode 4. The four ends of the cross-shaped support 4.2 are located between two adjacent sets of side plating solution flow holes 4.1. A cubic reinforcing block 4.4 is provided on the upper center of the cross-shaped support 4.2. The cross-shaped support 4.2 also has four central connecting holes 4.3.

[0030] Both the insulating top cover 3 and the insulating bottom cover 5 are made of insulating material and are circular plates. The insulating material can be PVC. The insulating top cover 3 and the insulating bottom cover 5 are respectively attached to the upper and lower surfaces of the figurative anode 4. The insulating top cover 3 and the insulating bottom cover 5 are respectively provided with an upper connecting hole 3.3 and a lower connecting hole 5.3 corresponding to the middle connecting hole 4.3. The fastener in this embodiment consists of a bolt 8, a washer 7, and a nut 6, all made of titanium alloy. The bolt 8 passes through the lower connecting hole 5.3, the middle connecting hole 4.3, and the upper connecting hole 3.3 in sequence. The nut 6 is connected to the tail end of the bolt 8 and tightened. The washer 7 is located on the inner side of the head of the bolt 8 and the inner side of the nut 6. The insulating top cover 3, the figurative anode 4, and the insulating bottom cover 5 are fixedly connected together by the fastener.

[0031] The diameters of the insulating top cover 3 and the insulating bottom cover 5 are larger than the outer diameter of the shaped anode 4, and the centers of the insulating top cover 3, the insulating bottom cover 5, and the shaped anode 4 coincide. The diameters of the insulating top cover 3 and the insulating bottom cover 5 are slightly smaller than the inner diameter of the main landing gear outer cylinder 2. During the electroplating process, the position of the shaped anode 4 is restricted by the insulating top cover 3 and the insulating bottom cover 5, so that the shaped anode 4 does not contact the main landing gear outer cylinder 2, and the center of the shaped anode 4 basically coincides with the center of the inner cavity 2.1 of the main landing gear outer cylinder 2. The distance between the side of the shaped anode 4 and the inner wall of the main landing gear outer cylinder 2 is basically consistent, which is conducive to the uniform distribution of electric field lines, reduces the ellipticity and taper of the main landing gear outer cylinder 2 after electroplating, and thus ensures the quality of chromium plating.

[0032] The insulating top cover 3 has an upper plating solution flow hole 3.2 near its center, which communicates with the central hole of the figurative anode 4. During electroplating, the plating solution on top and inside the figurative anode 4 can flow through the upper plating solution flow hole 3.2. In this embodiment, the insulating top cover 3 has multiple sets of upper plating solution flow holes 3.2. Each set of upper plating solution flow holes 3.2 includes three upper plating solution flow holes 3.2 arranged in a triangle, and each set of upper plating solution flow holes 3.2 is staggered from the position of the cross-shaped support 4.2. Near the edge of the insulating top cover 3, there is a ring of edge plating solution flow holes 3.1. The edge plating solution flow holes 3.1 connect the space on the top of the insulating top cover 3 with the space on the outer side of the figurative anode 4, so that the plating solution on the side can also flow during electroplating. In this embodiment, the insulating top cover 3 has a square through hole 3.4 in the middle. The reinforcing block 4.4 passes through the through hole 3.4 and protrudes to the top of the insulating top cover 3. The upper end of the reinforcing block 4.4 is cast together with the lower end of the conductive copper busbar 1, so that the conductive copper busbar 1, the cross-shaped bracket 4.2 and the figurative anode 4 are interconnected. The reinforcing block 4.4 can improve the stability of the connection with the conductive copper busbar 1 and increase the conductive area.

[0033] The insulating bottom cover 2 has a lower plating solution flow hole 5.2 near its center, which communicates with the central hole of the figurative anode 4. During electroplating, the plating solution below and the plating solution inside the figurative anode 4 can flow through the lower plating solution flow hole 5.2. In this embodiment, the insulating bottom cover 5 has multiple sets of lower plating solution flow holes 5.2. Each set of lower plating solution flow holes 5.2 includes three lower plating solution flow holes 5.2 arranged in a triangle. Each set of lower plating solution flow holes 5.2 is staggered from the position of the cross-shaped bracket 4.2. The lower edge of the insulating bottom cover 5 in this embodiment is machined into a rounded corner 5.1. The rounded corner 5.1 transitions to match the chamfer 2.3 on the step 2.2 in the middle of the inner cavity 2.1 of the main landing gear outer cylinder 2, so that the auxiliary anode can be stably placed on the step 2.2 in the middle of the inner cavity 2.1 of the main landing gear outer cylinder 2 during electroplating.

[0034] In this embodiment, a tin layer is plated on the upper end of the conductive copper busbar 1 to improve its corrosion resistance. An upper hole is provided on the upper end of the conductive copper busbar, through which it is connected to the external anode conductive wire 9 during electroplating. The conductive copper busbar 1 itself is made of copper and has a square cross-section.

[0035] In this embodiment, the conductive copper busbar 1, except for the upper outer surface, is covered with an insulating varnish layer. The outer surface of the reinforcing block 4.4 is also covered with an insulating varnish layer, which can prevent the conductive copper busbar 1 from accidentally short-circuiting with the main landing gear outer cylinder 2 and causing electric shock to the main landing gear outer cylinder.

[0036] The method of using the auxiliary anode in this embodiment is as follows:

[0037] When electroplating the inner wall of the main landing gear outer cylinder 2, the upper end of the conductive copper busbar 1 is connected to the anode copper busbar or the positive terminal of the power supply via the anode conductive wire 9, and the main landing gear outer cylinder 2 is connected to the cathode copper busbar or the negative terminal of the power supply via the cathode conductive wire 10. The figurative anode 4 extends entirely into the inner cavity 2.1 of the main landing gear outer cylinder 2. The main landing gear outer cylinder 2 can be immersed in the plating solution for chromium plating. Of course, the figurative anode 4 should be completely immersed in the plating solution. During the electroplating process, the plating solution can circulate through the side plating solution flow hole 4.1, the upper plating solution flow hole 3.2, the edge plating solution flow hole 3.1, and the lower plating solution flow hole 5.2, which makes the plating solution easy to circulate, has good temperature uniformity, and results in a uniform plating thickness and a smooth and dense appearance after electroplating.

[0038] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. An auxiliary anode for chromating the inner wall of the outer cylinder of the main landing gear of a Boeing 737 aircraft, characterized in that: The application relates to a kind of anode structures of main landing gear, including conductive copper bar, insulating top cover, pictographic anode, insulating bottom cover and fastener, the pictographic anode is hollow cylinder, the outer diameter of the pictographic anode is less than the inner diameter of main landing gear outer cylinder, the side wall of the pictographic anode is provided with side plating solution flow hole, the insulating top cover and the insulating bottom cover are circular plate, the insulating top cover and the insulating bottom cover are respectively adhered to the upper and lower two sides of the pictographic anode and are fixedly connected together by the fastener, the diameter of the insulating top cover and the insulating bottom cover is greater than the outer diameter of the pictographic anode, the center of the insulating top cover, the insulating bottom cover and the pictographic anode coincides, the insulating top cover is provided with upper plating solution flow hole communicated with the middle hole of the pictographic anode near the middle part, the insulating top cover is provided with edge plating solution flow hole communicated with the space of the lateral side of the pictographic anode near the edge, the insulating bottom cover is provided with lower plating solution flow hole communicated with the middle hole of the pictographic anode near the middle part, the middle part of the pictographic anode protrudes to the upper surface of the insulating top cover and is casted together with the lower end of the conductive copper bar, and the upper end of the conductive copper bar is used for connecting with the anode conductive wire outside.

2. The auxiliary anode for chrome plating of the inner wall of the outer cylinder of the main landing gear of Boeing 737 aircraft as claimed in claim 1 wherein: The middle hole of the pictographic anode is provided with cross-shaped support, the middle upper surface of the cross-shaped support is provided with reinforcing block, the middle of the insulating top cover is provided with through hole, the reinforcing block passes through the through hole and is casted together with the lower end of the conductive copper bar.

3. The auxiliary anode for chrome plating of the inner wall of the outer cylinder of the main landing gear of Boeing 737 aircraft as claimed in claim 2 wherein: The conductive copper bar is covered with insulating paint layer on the outer surface except the upper end, and the outer surface of the reinforcing block is also covered with insulating paint layer.

4. The auxiliary anode for chrome plating of the inner wall of the outer cylinder of the main landing gear of Boeing 737 aircraft as claimed in claim 2 wherein: The insulating top cover, cross-shaped support and insulating bottom cover are respectively provided with upper connecting hole, middle connecting hole and lower connecting hole, the fastener is composed of bolt, gasket and nut, the bolt passes through the lower connecting hole, middle connecting hole and upper connecting hole in sequence, the nut is connected to the tail end of the bolt, and the gasket is arranged on the inner side of the bolt head and the inner side of the nut.

5. The auxiliary anode for chrome plating of the inner wall of the outer cylinder of the main landing gear of Boeing 737 aircraft as claimed in claim 1 wherein: The lower edge of the insulating bottom cover is chamfered.

6. The auxiliary anode for chrome plating of the inner wall of the outer cylinder of the main landing gear of Boeing 737 aircraft as claimed in claim 1 wherein: The insulating top cover is provided with multiple groups of upper plating solution flow holes, each group of the upper plating solution flow holes comprises three upper plating solution flow holes arranged in triangle, the insulating bottom cover is provided with multiple groups of lower plating solution flow holes, and each group of the lower plating solution flow holes comprises three lower plating solution flow holes arranged in triangle.

7. The auxiliary anode for chrome plating of the inner wall of the outer cylinder of the main landing gear of Boeing 737 aircraft as claimed in claim 1 wherein: The upper end of the conductive copper bar is provided with upper end hole for connecting with the anode conductive wire outside, and the upper end of the conductive copper bar is plated with tin layer.

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