Cadmium-plated anode assembly for inner wall of axle of main landing gear of Boeing 737 aircraft

Abstract

The utility model discloses a Boeing 737 aircraft main landing gear axle inner wall cadmium plating anode assembly which comprises a conducting rod, a first insulation clamping cover, a contoured anode tube, an insulation sheet, a cathode conducting plate and a second insulation clamping cover, the conducting rod penetrates through the middle of the contoured anode tube, and the inner diameter of the contoured anode tube is larger than the diameter of the conducting rod. The tube wall of the conformal anode tube is provided with a plurality of side liquid flow through holes, one end of the conducting rod is provided with an anode conducting plate extending out in the radial direction, the end, where the anode conducting plate is located, of the conducting rod is in threaded connection with a positioning nut, and the first insulating clamp cover is movably connected to the conducting rod and located on the inner side of the positioning thread. The other end of the conducting rod is in threaded connection with a fastening nut, the second insulating clamp cover is movably connected to the conducting rod and located on the inner side of the fastening nut, the cathode conducting plate is arranged on the inner side of the second insulating clamp cover, and the insulating sheet is arranged between the cathode conducting plate and the conformal anode tube. The device can solve the problem of electroplating repair of the cadmium layer on the inner wall of the axle of the main landing gear.

Description

Technical Field

[0001] This utility model belongs to the field of metal surface treatment technology, specifically relating to a cadmium-plated anode assembly for the inner wall of the main landing gear axle of a Boeing 737 aircraft. Background Technology

[0002] Cadmium plating deposits a layer of cadmium on the surface of steel to protect steel parts from corrosion. This method is widely used in the aerospace industry. The main landing gear axles of the Boeing 737 series use high-strength alloy steel as their base material and employ a cadmium plating layer as an anti-corrosion protective layer. Even if the cadmium layer is scratched or cracked during use, the exposed substrate can still be protected to some extent by the wear and tear of the cadmium layer, because cadmium acts as an anode relative to the high-strength alloy steel substrate. The main landing gear axles of the Boeing 737 series are slender axles with a central cavity running through both ends. The cavity itself is also slender, and the walls of the slender main landing gear axle cavity are coated with a cadmium layer.

[0003] Because the landing gear of the Boeing 737 series aircraft is located in a non-enclosed space under the fuselage, it is exposed to complex environments such as various industrial, humid, and marine atmospheres during the aircraft's service life. This makes the metal parts of the landing gear highly susceptible to corrosion, thus necessitating the maintenance of the main landing gear axles. During maintenance, it is often necessary to electroplate the cadmium layer on the inner wall of the slender main landing gear axles. However, there is currently no suitable device for cadmium plating the inner wall of the slender main landing gear axles, which is a problem that urgently needs to be solved. Therefore, this utility model designs an anode assembly that is easy and quick to install, highly practical, and capable of cadmium plating the inner wall of the slender Boeing 737 series landing gear axles. Utility Model Content

[0004] The purpose of this invention is to provide a cadmium-plated anode assembly for the inner wall of the main landing gear axle of a Boeing 737 aircraft, in order to solve the problem of electroplating repair of the cadmium layer on the inner wall of the main landing gear axle.

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

[0006] A cadmium-plated anode assembly for the inner wall of the main landing gear axle of a Boeing 737 aircraft is characterized by comprising a conductive rod, a first insulating cover, a shaped anode tube, an insulating sheet, a cathode conductive plate, and a second insulating cover. The shaped anode tube is arranged laterally, and the conductive rod passes through the middle of the shaped anode tube, allowing electrical conductivity between the conductive rod and the shaped anode tube. The inner diameter of the shaped anode tube is larger than the diameter of the conductive rod. The wall of the shaped anode tube has several side liquid flow holes. One end of the conductive rod has a radially extending anode conductive plate, and the end of the conductive rod where the anode conductive plate is located is threadedly connected to a positioning nut. The first insulating cover is movably connected to the conductive rod and located inside the positioning thread. The other end of the conductive rod is threadedly connected to a fastening nut. The second insulating cover is movably connected to the conductive rod and located inside the fastening nut. The cathode conductive plate is located inside the second insulating cover, and the insulating sheet is located between the cathode conductive plate and the shaped anode tube.

[0007] A further technical solution of this utility model is as follows: the two ends of the shaped anode tube are respectively provided with coaxial holes in the middle, and the two ends of the conductive rod pass through the coaxial holes respectively.

[0008] A further technical solution of this utility model is: the two ends of the shaped anode tube are provided with end face liquid flow holes.

[0009] A further technical solution of this utility model is as follows: a protruding annular connecting part is provided on the side of the second insulating cover, and a sleeve hole is provided in the middle of the cathode conductive plate. The sleeve hole fits onto the annular connecting part, and the second insulating cover and the cathode conductive plate are fixedly connected by connecting bolts.

[0010] A further technical solution of this utility model is as follows: the two ends of the second insulating cover are respectively provided with connecting through holes, the two ends of the cathode conductive plate are respectively provided with threaded holes, and the connecting bolt passes through the connecting through holes and is threadedly connected to the threaded holes.

[0011] A further technical solution of this utility model is as follows: the middle part of the first insulating cover and the second insulating cover are respectively provided with a first central hole and a second central hole, the two ends of the conductive rod pass through the first central hole and the second central hole respectively, and the middle of the annular connecting part is aligned with the middle of the second central hole.

[0012] A further technical solution of this utility model is: the side of the cathode conductive plate and the side of the first insulating clip are respectively provided with annular grooves for fastening to the end face of the main landing gear wheel axle.

[0013] A further technical solution of this utility model is that the ends of the anode conductive plate and the cathode conductive plate used for connecting to the wire are located on the same side.

[0014] A further technical solution of this utility model is that electrode connection holes are respectively provided on the anode conductive plate and the cathode conductive plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this utility model, the anode conductive plate connected to the positive terminal of the power supply and the cathode conductive plate connected to the negative terminal of the power supply are respectively located at the two far ends of the cadmium plating anode assembly. This can effectively reduce the risk of short circuit accidents caused by contact between the positive and negative terminals during the electroplating process. At the same time, it can make the wires more evenly distributed around the plated part, which is more conducive to the consistency of the plating thickness.

[0017] 2. During the electroplating process, the shaped anode tube of this utility model is directly inserted into the inner cavity of the main landing gear wheel axle to plate cadmium in the designated area. The shaped anode tube has a special structure with multiple through holes, which facilitates the circulation of the plating solution, improves temperature uniformity, and is conducive to the formation of a uniform, dense, and smooth plating layer.

[0018] 3. In this utility model, the shaped anode tube is inserted horizontally into the inner cavity of the main landing gear wheel axle. The whole is arranged horizontally. This utility model is placed horizontally in the same layer of plating solution for electroplating. Compared with the previous vertical electroplating structure, the temperature difference of the same layer of plating solution is smaller, which makes it easier to form a uniform coating.

[0019] 4. This utility model has a simple structure, is easy to operate and maintain, and has strong versatility. It can be matched with different sizes and specifications of shaped anode tubes, cathode conductive plates and insulating clips according to actual conditions, so that it can be used for cadmium plating on the inner wall of wheel axles of the same structure in other models. Attached Figure Description

[0020] Figure 1 This is an exploded view of the cadmium-plated anode assembly according to an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the cadmium-plated anode assembly and the main landing gear axle in an embodiment of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the conductive rod according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the pictographic anode tube according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the first insulating clip according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the cathode conductive plate according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the second insulating clip according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure when the cathode conductive plate and the second insulating cover are assembled together according to an embodiment of the present invention.

[0028] Meaning of the labels in the attached diagram:

[0029] 1-Anode conductive plate; 2-Positioning nut; 3-First insulating clamp; 4-Conductive rod; 5-Icon-shaped anode tube; 6-Side liquid flow hole; 7-End face liquid flow hole; 8-Insulating sheet; 9-Cathode conductive plate; 10-Annular groove; 11-Second insulating clamp; 12-Connecting through hole; 13-Connecting bolt; 14-Washer; 15-Screw; 16-Fastening nut; 17-Cathode conductive wire; 18-Winged fixing nut; 19-Anode conductive wire; 20-Electrode connection hole; 21-Main landing gear wheel axle; 22-Coaxial hole; 23-First central hole; 24-Sleeve hole; 25-Threaded hole; 26-Annular connecting part; 27-Second central hole. Detailed Implementation

[0030] The present invention will be further described below with reference to embodiments.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Example:

[0035] like Figures 1 to 8The image shown is a cadmium-plated anode assembly for the inner wall of the main landing gear axle of a Boeing 737 aircraft according to this embodiment. It includes a conductive rod 4, a first insulating cover 3, a figurative anode tube 5, an insulating sheet 8, a cathode conductive plate 9, and a second insulating cover 11. The first insulating cover 3, the insulating sheet 8, and the second insulating cover 11 are all made of insulating materials.

[0036] The shape of the shaped anode tube 5 is adapted to the inner cavity shape of the main landing gear wheel axle 21, and it is made of stainless steel. The tube wall of the shaped anode tube 5 is provided with several side liquid flow holes 6, and the two ends of the shaped anode tube 5 are provided with end face liquid flow holes 7. During electroplating, the plating solution at the side and end face positions can circulate through the side liquid flow holes 6 and end face liquid flow holes 7 respectively, which can make the temperature uniformity of the plating solution better and is conducive to the formation of a uniform, dense and smooth coating.

[0037] The two end faces of the figurative anode tube 5 are respectively provided with coaxial holes 22, the diameter of which is equal to the diameter of the conductive rod 4. The conductive rod 4 is a solid stainless steel round rod with external threads at both ends. The conductive rod 4 passes through the middle of the figurative anode tube 5, and its two ends protrude from the coaxial holes 22 to the outside of the figurative anode tube 5. The wall of the coaxial hole 22 contacts the conductive rod 4, allowing electrical conductivity between the conductive rod 4 and the figurative anode tube 5. The inner diameter of the figurative anode tube 5 is larger than the diameter of the conductive rod 4, allowing for sufficient space for plating solution flow within the figurative anode tube 5.

[0038] like Figure 3 As shown, one end of the conductive rod 4 is provided with a radially extending anode conductive plate 1, making the conductive rod 4 in an L-shape. The anode conductive plate 1 is provided with an electrode connection hole 20. During electroplating, the head of the anode conductive wire 19 is connected to the electrode connection hole 20 on the anode conductive plate 1 through a conventional fastener. The conventional fastener can be composed of a screw 15, a washer 14 and a wing-shaped fixing nut 18, made of stainless steel, and all surfaces except the threaded part are sprayed with insulating paint.

[0039] The end of the conductive rod 4 where the anode conductive plate 1 is located is threaded with a positioning nut 2. The first insulating cover 3 has a first central hole 23 in the middle. The first insulating cover 3 is movably connected to the conductive rod 4 through the first central hole 23 and is located inside the positioning thread 2. The side of the first insulating cover 3 facing the shaped anode tube 5 is provided with an annular groove 10 for fastening to the end face of the main landing gear wheel axle 21.

[0040] The other end of the conductive rod 4 is threaded with a fastening nut 16. In this embodiment, the fastening nut 16 is a wing nut made of stainless steel. The second insulating cover 11 has a second central hole 27 in the middle. The second insulating cover 11 is movably connected to the conductive rod 4 through the second central hole 27 and is located inside the fastening nut 16.

[0041] The cathode conductive plate 9 is made of copper and is located inside the second insulating cover 11. Specifically, the second insulating cover 11 has a protruding annular connecting part 26 on its side, with the center of the annular connecting part 26 aligned with the center of the second central hole 27. The second insulating cover 11 has connecting through holes 12 at both ends. The cathode conductive plate 9 has a sleeve hole 24 in its center, with the diameter of the sleeve hole 24 equal to the outer diameter of the annular connecting part 26. The cathode conductive plate 9 has threaded holes 25 at both ends corresponding to the connecting through holes 12. The cathode conductive plate 9 rests against the inner side of the second insulating cover 11, with the sleeve hole 24 fitting snugly onto the annular connecting part 26. A connecting bolt 13 passes through the connecting through hole 12 and is threaded into the threaded hole 25, achieving a fixed connection. The annular connecting part 26 of the second insulating cover 11 isolates the cathode conductive plate 9 from the conductive rod 4, preventing short circuits.

[0042] The insulating sheet 8 is in the shape of a ring. The insulating sheet 8 is sleeved on the conductive rod 4 and is located between the cathode conductive plate 9 and the figurative anode tube 5. The insulating sheet 8 isolates the cathode conductive plate 9 and the figurative anode tube 5, which can prevent short circuits from occurring during conduction.

[0043] The cathode conductive plate 9 also has an annular groove 10 on the side facing the shaped anode tube 5 for fastening to the end face of the main landing gear axle 21. The cathode conductive plate 9 also has an electrode connection hole 20. The head of the cathode conductive wire 17 is connected to the electrode connection hole 20 on the cathode conductive plate 9 by conventional fasteners. The end of the cathode conductive plate 9 with the electrode connection hole 20 is located on the same side as the end of the anode conductive plate 1 with the electrode connection hole 20.

[0044] The method of using the cadmium-plated anodized assembly on the inner wall of the main landing gear axle of the Boeing 737 aircraft in this embodiment is as follows:

[0045] The main landing gear axle 21 is arranged laterally. A shaped anode tube 5 is inserted laterally into the inner cavity of the main landing gear axle 21. A positioning nut 2 and a first insulating clamp 3 are pre-connected to a conductive rod 4. The conductive rod 4 is then passed through the middle of the shaped anode tube 5. An insulating sheet 8, a cathode conductive plate 9, a second insulating clamp 11, and a fastening nut 16 are then connected to the conductive rod 4. The annular grooves 10 on the side of the cathode conductive plate 9 and the side of the first insulating clamp 3 are respectively fastened to the end face of the main landing gear axle 21. The fastening nut 16 is then tightened, clamping the main landing gear axle 21 between the first insulating clamp 3 and the cathode conductive plate 9. At this point, as... Figure 2As shown, at this time, the cathode conductive plate 9 is conductive to the main landing gear axle 21, while the main landing gear axle 21 is not conductive to the conductive rod 4. The cathode conductive wire 17 and the anode conductive wire 19 are connected to the cathode conductive plate 9 and the anode conductive plate 1, respectively, and then electroplating can be performed. The cadmium-plated anode assembly and the main landing gear axle 21 on it are placed horizontally in the plating solution for electroplating.

[0046] 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. A cadmium plated anode assembly for the inner wall of the wheel axle of a Boeing 737 aircraft main landing gear, characterized in that: The device comprises a conductive rod, a first insulating clamp cover, an anode-shaped tube, an insulating sheet, a cathode conductive plate and a second insulating clamp cover, the anode-shaped tube is arranged transversely, the conductive rod passes through the middle of the anode-shaped tube, the conductive rod and the anode-shaped tube can conduct electricity, the inner diameter of the anode-shaped tube is larger than the diameter of the conductive rod, a plurality of side liquid flow through holes are arranged on the tube wall of the anode-shaped tube, the anode conductive plate of the conductive rod extends radially from one end, the end of the anode conductive plate is threadedly connected with a positioning nut, the first insulating clamp cover is movably connected to the conductive rod and located on the inner side of the positioning nut, the other end of the conductive rod is threadedly connected with a fastening nut, the second insulating clamp cover is movably connected to the conductive rod and located on the inner side of the fastening nut, the cathode conductive plate is arranged on the inner side of the second insulating clamp cover, and the insulating sheet is arranged between the cathode conductive plate and the anode-shaped tube.

2. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 1, wherein: Coaxial holes are arranged in the middle of the two end faces of the anode-shaped tube, and the two ends of the conductive rod pass through the coaxial holes.

3. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 2, wherein: End face liquid flow through holes are arranged on the two end sides of the anode-shaped tube.

4. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 1, wherein: A protruding circular ring-shaped connecting part is arranged on the side of the second insulating clamp cover, a sleeve hole is arranged in the middle of the cathode conductive plate, the sleeve hole is fitted on the circular ring-shaped connecting part, and the second insulating clamp cover and the cathode conductive plate are fixedly connected through a connecting bolt.

5. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 4, wherein: Connecting through holes are arranged at the two ends of the second insulating clamp cover, threaded holes are arranged at the two ends of the cathode conductive plate, the connecting bolt passes through the connecting through holes and is threadedly connected with the threaded holes.

6. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 4, wherein: First and second middle holes are arranged in the middle of the first and second insulating clamp covers respectively, the two ends of the conductive rod pass through the first and second middle holes respectively, and the middle of the circular ring-shaped connecting part is aligned with the middle of the second middle hole.

7. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 1, wherein: Ring grooves for buckling on the end faces of the main landing gear wheel shafts are arranged on the sides of the cathode conductive plate and the first insulating clamp cover respectively.

8. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 1, wherein: The end portions of the anode conductive plate and the cathode conductive plate for connecting with electric wires are located on the same side.

9. The Boeing 737 aircraft main landing gear wheel axle inner wall cadmium plated anode assembly of claim 8, wherein: Electrode connecting holes are arranged on the anode conductive plate and the cathode conductive plate respectively.

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