Circumferential magnetization tool for outer cylinder of shock strut of aircraft main landing gear

Abstract

The utility model provides an aircraft main undercarriage shock strut outer cylinder circumferential magnetization tool which is made of conductive materials and comprises eight supporting nuts, eight pressing nuts, a connecting plate, a blanking cap, a first electrode column and a second electrode column. The supporting nuts and the pressing nuts are screwed on the eight studs on the supporting arm at one end of the shock strut outer cylinder in a one-to-one correspondence mode, and the supporting nuts are located at the bottoms of the studs. The connecting plate is arranged on the stud in a sleeving mode and clamped between the supporting nut and the pressing nut. The blanking cap is connected to the other end of the outer cylinder; and the first electrode column and the second electrode column are in contact with an electrode plate of the magnetic particle flaw detector and are respectively connected with the connecting plate and the blanking cap. According to the utility model, a part is clamped on the magnetic particle flaw detector by utilizing a simple structure, and the whole part can generate a circumferential magnetic field when electrified and magnetized, so that the longitudinal defects of all parts of an outer cylinder can be effectively detected, the risk of leak detection can be avoided, and the contact surface of an electrode plate of the magnetic detector and the outer cylinder can be prevented from being burnt due to large current and poor contact. The flaw detection quality is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic powder detection, and in particular relates to a circumferential magnetization device for an outer cylinder of a shock-absorbing strut of a main landing gear of an aircraft. Background Art

[0002] Before being put into use, the outer cylinder of the aircraft's main landing gear shock absorber strut needs to be circumferentially magnetized on all visible surfaces to check for longitudinal defects. However, its diameter is large and one end has two arms with four screws installed on each arm, making it difficult to clamp it directly between the electrode plates of a magnetic particle inspection machine for circumferential magnetization. In addition, because the cylinder wall at the other end of the part is thinner, the electrode plates of the magnetic inspection machine come into contact with it during magnetization, which may cause burns due to high current and poor contact. The current circumferential magnetization method commonly used for this part is to pass an aluminum rod through the outer cylinder and apply electricity. However, because the tip of the arm is far away from the axis of the outer cylinder, the weak magnetic field cannot effectively detect this area, nor can it detect the longitudinal defects of the eight screws, posing a risk of missed detection. Utility Model Content

[0003] The purpose of the utility model is to solve the problems in the prior art that the outer cylinder of the shock absorber strut of the main landing gear of an aircraft is difficult to clamp between the electrode plates of a magnetic particle inspection machine when circumferentially magnetizing to inspect longitudinal defects, which easily causes burns, and the outer cylinder cannot effectively inspect the tip area of the support arm and the screw piles, resulting in missed inspections. The utility model provides a circumferential magnetization device for the outer cylinder of the shock absorber strut of the main landing gear of an aircraft.

[0004] To achieve the above objectives, the technical solutions provided by this utility model are:

[0005] A circumferential magnetization device for the outer tube of a shock absorber strut of an aircraft main landing gear is made of a conductive material and includes eight supporting nuts, a connecting plate, eight pressing nuts, a plugging cover, and a first electrode column and a second electrode column;

[0006] The support nut is used to support the connecting plate, and the compression nut is used to compress the connecting plate to the support arm at one end of the outer tube of the aircraft main landing gear shock absorber strut. The support nut and the compression nut are screwed one by one onto the eight screw piles on the outer tube support arm of the shock absorber strut, with the support nut located at the bottom of the screw pile, and the connecting plate is sleeved on the screw pile and sandwiched between the support nut and the compression nut.

[0007] The plugging cover is connected to the other end of the outer tube of the shock absorber strut; the first electrode column and the second electrode column are used to contact the electrode plate of the magnetic particle flaw detector, and are respectively connected to the connecting plate and the plugging cover.

[0008] Furthermore, a first threaded hole is provided in the middle of the connecting plate for threadedly connecting the first electrode column to the connecting plate.

[0009] Furthermore, a second threaded hole is provided in the middle of the blocking cover for threaded connection of the second electrode column to the blocking cover.

[0010] Further, the tooling is made of brass.

[0011] Furthermore, the connecting plate and the first electrode column are integrally formed.

[0012] Furthermore, the blocking cover and the second electrode column are integrally formed.

[0013] The advantages of the utility model are:

[0014] The utility model is a circumferential magnetization device for the outer tube of the shock absorber strut of the aircraft main landing gear. A connecting plate and a plug cap are provided at each end of the outer tube of the shock absorber strut. The connecting plate is connected to all the screws at the arm of the part through two plug caps. Electrode columns are also provided for the connecting plate and the plug cap. When the part is subjected to electromagnetization, the electrode plate of the magnetic particle inspection machine can directly contact the two electrode columns. Therefore, the utility model utilizes a simple structure to facilitate clamping the part on the magnetic particle inspection machine. When electromagnetization is applied, the entire part, including the eight screws at the arm, can generate a circumferential magnetic field, so that longitudinal defects in all parts of the outer tube of the shock absorber strut can be effectively detected, eliminating the risk of missed detection, and avoiding burns on the contact surface between the electrode plate of the magnetic inspection machine and the outer tube due to high current and poor contact, thereby ensuring the quality of flaw detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or other features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and in which some features are exaggerated or reduced to show details of specific components. In the accompanying drawings:

[0016] Figure 1 This is a schematic structural diagram of the circumferential magnetization assembly for the outer tube of the shock absorber strut of the main landing gear of an aircraft according to the present invention;

[0017] Figure 2 The utility model is a structural schematic diagram of the circumferential magnetization device of the outer tube of the shock-absorbing strut of the main landing gear of an aircraft in use.

[0018] In the figure: 1-support nut; 2-connecting plate; 3-pressing nut; 4-blocking cover; 5-first electrode column; 6-second electrode column; 100-test piece; 101-support arm; 102-screw. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration and is not intended to limit the present invention.

[0020] This utility model provides a circumferential magnetization tool for the outer cylinder of an aircraft main landing gear shock strut. This tool is used to clamp the part during circumferential magnetization to inspect for longitudinal defects. Circumferential magnetization using this tool facilitates clamping of the part to be inspected, avoids burns on the contact surface between the magnetic probe electrode plate and the part, and ensures that longitudinal defects in all parts of the part and the eight screws on the outer cylinder support arm can be detected.

[0021] Reference Figure 1 and Figure 2 The circumferential magnetization tooling for the outer cylinder of an aircraft main landing gear shock absorber strut, an exemplary embodiment of the present invention, includes eight support nuts 1, a connecting plate 2, eight compression nuts 3, a plug cover 4, and first and second electrode columns 5 and 6. The tooling is made of a conductive material, particularly brass.

[0022] Support nut 1 supports connecting plate 2, while compression nut 3 presses connecting plate 2 against test object 100, namely, arm 101 at one end of the shock strut outer tube of an aircraft main landing gear. Support nut 1 and compression nut 3 are screwed onto eight studs 102 on shock strut outer tube arm 101, one by one, with support nut 1 located at the bottom of the studs.

[0023] The connecting plate 2 is sleeved on each screw pile 102 and is sandwiched between the supporting nut 1 and the pressing nut 3. The three are in close contact with the screw pile 102, providing conditions for passing large current.

[0024] The plugging cover 4 is connected to the other end of the outer tube of the shock absorber strut and contacts the end surface of the outer tube to increase the contact surface and prevent the local temperature from being too high due to the small contact surface.

[0025] The first electrode column 5 and the second electrode column 6 are used to contact the electrode plate of the magnetic particle detector to avoid direct contact between the outer tube and the electrode plate of the magnetic detector, effectively preventing damage to the outer tube due to large current and poor contact during ignition. The first electrode column 5 and the second electrode column 6 are connected to the connecting plate 2 and the plug cover 4, respectively. In some embodiments, the first electrode column 5 and the connecting plate 2 are separately processed components, and a first threaded hole is provided in the middle of the connecting plate 2 for threaded connection of the first electrode column 5 to the connecting plate 2. In addition, the second electrode column 6 and the plug cover 4 can also be two separate components, and a second threaded hole is provided in the middle of the plug cover 4 for threaded connection of the second electrode column 6 to the plug cover 4. In other embodiments, the connecting plate 2 and the first electrode column 5 are integrally formed as a single component. In addition, the plug cover 4 and the second electrode column 6 can also be integrally formed.

[0026] like Figure 2 As shown, the method of using the circumferential magnetization device for the outer tube of the shock absorber strut of the main landing gear of the aircraft provided by the present invention is as follows:

[0027] Step 1: Install eight nuts 1 on eight screw piles 102 at the support arm 101 of the test piece 100 respectively;

[0028] Step 2: Put the connecting plate 2 onto the eight screw piles 102;

[0029] Step 3: Install the compression nut 3 on the screw pile 102 to compress the connecting plate 2;

[0030] Step 4: Screw the plug 4 into the hole at the other end of the outer tube until it is fully screwed in, ensuring that the end surface of the outer tube is in close contact with the plug;

[0031] Step 5: Install the first electrode column 5 and the second electrode column 6 into the connector 3 and the plug cover 4 respectively and tighten them;

[0032] Step 6: Use two electrode plates of a magnetic particle detector to clamp the first electrode column 5 and the second electrode column 6 at both ends of the outer cylinder;

[0033] Step 7: Electromagnetization is performed to detect longitudinal defects of the test piece 100 including its eight screw piles 102 .

[0034] It should be understood that in this example, the first electrode column 5 and the second electrode column 6 are independent of the connector 3 and the plugging cover 4, respectively. However, as described above, they can be integrally formed. Furthermore, the above steps are merely examples and are not intended to limit the present invention. For example, step 5 can be performed before step 1.

[0035] As described above, the utility model of the circumferential magnetization device for the outer tube of the shock absorber strut of the aircraft main landing gear provides a connecting plate and a plug cap for each end of the outer tube of the shock absorber strut. The connecting plate is connected to all the screws at the arm of the part through two plug caps. Electrode columns are also provided for the connecting plate and the plug cap respectively. When the part is electromagnetized, the electrode plate of the magnetic particle detector can directly contact the two electrode columns. Therefore, the utility model utilizes a simple structure to make it easy to clamp the part on the magnetic particle detector, and when electromagnetized, the entire part, including the eight screws at the arm, can generate a circumferential magnetic field, so that the longitudinal defects of all parts of the outer tube of the shock absorber strut can be effectively detected, eliminating the risk of missed detection, and avoiding burns on the contact surface between the electrode plate of the magnetic detector and the outer tube due to high current and poor contact, thereby ensuring the quality of flaw detection.

[0036] Finally, it should be noted that the features mentioned and / or illustrated in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, and may be combined with or replace the features of other embodiments. The technical solutions obtained by such combination or replacement shall also be deemed to be included in the scope of protection of the present invention.

Claims

1. A circumferential magnetization device for the outer tube of an aircraft main landing gear shock absorber strut, characterized in that: Made of conductive material, including eight supporting nuts, a connecting plate, eight pressing nuts, a plugging cover, and a first electrode column and a second electrode column; The support nut is used to support the connecting plate, and the compression nut is used to compress the connecting plate to the support arm at one end of the outer tube of the shock absorber strut of the aircraft main landing gear. The support nut and the compression nut are screwed on eight screw piles on the support arm of the shock absorber strut outer tube in a one-to-one correspondence, and the support nut is located at the bottom of the screw pile. The connecting plate is sleeved on the screw pile and sandwiched between the support nut and the compression nut. The blocking cover is connected to the other end of the outer tube of the shock absorber strut; the first electrode column and the second electrode column are used to contact the electrode plate of the magnetic particle flaw detector, and are respectively connected to the connecting plate and the blocking cover.

2. The circumferential magnetization device for the outer tube of the shock absorber strut of the main landing gear of an aircraft according to claim 1, characterized in that: A first threaded hole is provided in the middle of the connecting plate for threadedly connecting the first electrode column to the connecting plate.

3. The circumferential magnetization device for the outer tube of the shock absorber strut of the main landing gear of an aircraft according to claim 1 or 2, characterized in that: A second threaded hole is provided in the middle of the blocking cover for threadedly connecting the second electrode column to the blocking cover.

4. The circumferential magnetization device for the outer tube of the shock absorber strut of the main landing gear of an aircraft according to claim 1 or 2, characterized in that: The tooling is made of brass.

5. The circumferential magnetization device for the outer tube of the shock absorber strut of the main landing gear of an aircraft according to claim 1, characterized in that: The connecting plate and the first electrode column are integrally formed.

6. The circumferential magnetization device for the outer tube of the shock absorber strut of the main landing gear of an aircraft according to claim 1 or 2, characterized in that: The blocking cover and the second electrode column are integrally formed.

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