Overall detection device and detection method for front landing gear buffer strut

Abstract

The application provides a front landing gear buffer strut overall detection device and detection method. The detection device comprises a detection platform, a journal assembly, a joint assembly, an axle assembly, an axle detection spindle and a joint detection spindle. The journal assembly is provided with a stop pin. The journal assembly is provided with a positioning size L in a second direction. One end of the positioning size L falls on one side of the stop pin. The axle center line of the joint detection spindle forms an anti-twist arm hole axis line. The joint assembly is provided with a first measurement surface and a second measurement surface. The top of the axle assembly is provided with the axle detection spindle and an axle axis line. The axle assembly is provided with a third measurement surface and a fourth measurement surface. The application is designed with suitable reference surfaces. The offset degree is obtained by detecting the spacing between each axis line and the corresponding reference surface. The performance index of the landing gear is ensured, and the safe operation of the airplane is ensured.

Description

Technical Field

[0001] This invention relates to the field of aircraft landing gear parts processing technology, and in particular to an overall testing device and testing method for the nose landing gear buffer strut. Background Technology

[0002] like Figure 1 As shown, the nose landing gear buffer strut 10 mainly includes a journal 101, an outer cylinder 102, a rotating sleeve 103, and a piston rod 104 arranged sequentially. The journal 101 is connected to the aircraft body. The rotating sleeve 103 is used to connect the outer cylinder 102 and the piston rod 104 of the buffer strut, and the rotating sleeve 103 is provided with an anti-torsion arm hole for installing an anti-torsion arm. The end of the piston rod 104 away from the rotating sleeve 103 is provided with a wheel axle hole 105, which is used to install a wheel axle, and the wheel axle is used to install a wheel.

[0003] The buffer strut 10 needs to meet the various performance requirements of the aircraft. Before it leaves the factory, it needs to be tested as a whole to ensure that the dimensions and positional relationships between its main components meet the design requirements and that the aircraft can operate safely.

[0004] Currently, the front landing gear buffer strut 10 has a relatively long external dimension. How to conduct effective testing and which indicators can accurately reflect quality performance are the key points that need to be studied.

[0005] Therefore, there is a need to provide a testing device and method for testing the nose landing gear strut, in order to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for detecting the overall structure of the front landing gear buffer strut, which can accurately detect the long-distance spatial dimensions of the front landing gear buffer struts and their relative positions, ensuring the smooth delivery of the landing gear.

[0007] The technical solution of the present invention is as follows: A front landing gear buffer strut overall inspection device includes an inspection platform and a journal assembly, a joint assembly, a wheel axle assembly, a wheel axle inspection mandrel and a joint inspection mandrel for passing through the anti-torsion arm hole on the buffer strut, arranged sequentially along a first direction on the inspection platform. The journal assembly is provided with a stop pin for positioning the journal on the buffer strut and forming the axis of the journal as a reference axis. The journal assembly is provided with a positioning dimension L in a second direction. One end of the positioning dimension L rests on one side of the stop pin. The first direction and the second direction are perpendicular to each other on the same top projection plane.

[0008] The axis of the joint detection mandrel forms the anti-torsion arm hole axis. The joint assembly is provided with a first measuring surface for measuring the distance L1 between the joint and the anti-torsion arm hole axis, and a second measuring surface for measuring the distance L2 between the joint and the anti-torsion arm hole axis of the buffer support.

[0009] The top of the wheel axle assembly is provided with the wheel axle detection spindle for passing through the wheel axle on the buffer support. The centerline of the wheel axle detection spindle forms the wheel axle axis. The wheel axle assembly is provided with a third measuring surface for measuring the distance L3 between itself and the wheel axle axis, and a fourth measuring surface for measuring the distance L4 between itself and the wheel axle axis.

[0010] The first and third measuring surfaces are both vertically arranged, while the second and fourth measuring surfaces are both parallel to the detection platform.

[0011] In the above scheme, a reference axis is formed by setting a journal assembly and positioning it with a spacing L. The anti-torsion arm hole axis on the positioning joint assembly and the wheel axle axis on the positioning wheel axle assembly are then positioned using this reference axis. Suitable reference surfaces are designed on the joint assembly and wheel axle assembly. By measuring the distance between the anti-torsion arm hole axis and the corresponding reference surface, the parallelism (i.e., the skewness) of the anti-torsion arm mounting hole axis relative to the journal axis and the parallelism of the wheel axle hole axis on the piston rod relative to the journal axis are obtained, ensuring the landing gear performance indicators and guaranteeing the safe operation of the aircraft.

[0012] Preferably, the journal assembly includes a bracket, a axial pressing assembly, and a side-pushing assembly. The bracket has one axial pressing assembly at each end in the second direction. The stop pin is installed on the axial pressing assembly. The stop pin on the axial pressing assembly at one end forms a positioning dimension L. The side-pushing assembly is located beside the axial pressing assembly at that end, and the side-pushing assembly extends and retracts axially in the direction of the positioning dimension L.

[0013] Preferably, the axial compression assembly includes a V-block, a pressure plate, an ear, a first swivel bolt, a second swivel bolt, and a handle nut. The bottom of the V-block is mounted on the bracket, and the top forms a V-shaped opening. The stop pin is disposed on two side walls of the V-shaped opening. The pressure plate is located above the V-block. The ear is hinged to one end of the V-block. The first swivel bolt is connected to the ear and hinged to the pressure plate. The second swivel bolt is hinged to the other end of the V-block. The handle nut is threaded onto the second swivel bolt. The end of the pressure plate away from the first swivel bolt has an opening, and the second swivel bolt can rotate and engage in the opening.

[0014] Preferably, the surface of the pressure plate opposite to the V-shaped opening is an arc-shaped surface.

[0015] Preferably, the detection platform is provided with a first group of holes for detecting and positioning a first type of buffer support, a second group of holes for detecting and positioning a second type of buffer support, and a third group of holes for detecting and positioning a third type of buffer support. The three groups of holes share holes 01 and 02. Holes 01 and 02 are located close to the journal assembly, and the center line of hole 01 and one side of the stop pin form the positioning dimension L.

[0016] Preferably, the connector assembly includes a second base plate, a first bushing, a measuring block, and a connector bracket. The second base plate has at least one through hole at each end in a second direction. The first bushing is disposed in the through hole, and a pin is inserted into the first bushing for positioning with the detection platform. The connector bracket is spaced apart on the second base plate, and an L-shaped vertical side and a horizontal side are formed at the upper end of the connector bracket. A measuring block is installed on the vertical side and the horizontal side, respectively. The outer surface of the measuring block on the vertical side forms the first measuring surface, and the lower surface of the measuring block on the horizontal side forms the second measuring surface.

[0017] Preferably, the horizontal edge is located at the lower end of the vertical edge, and the horizontal edge is positioned closer to the journal assembly.

[0018] Preferably, the wheel axle assembly includes a third base plate, a U-shaped seat, a second bushing, and a wheel axle support. The third base plate has at least one through hole at each end in the second direction, and a second bushing is provided in the through hole. A pin is inserted into the second bushing to position it with the detection platform. The wheel axle supports are spaced apart on the third base plate, and the U-shaped seat is installed at the upper end of the wheel axle supports. The wheel axle detection spindle is clamped in the U-shaped seat, and the third measuring surface and the fourth measuring surface are formed on the U-shaped seat.

[0019] Preferably, the front landing gear strut overall inspection device further includes a support assembly for bottom support of the strut, the support assembly being mounted on the inspection platform and located between the joint assembly and the wheel axle assembly.

[0020] The present invention also provides a method for overall inspection of the nose landing gear buffer strut, which uses the aforementioned nose landing gear buffer strut overall inspection device and includes:

[0021] Step 1: Install the buffer support pillars

[0022] Step 1.1: Based on the model of the buffer support to be tested, position the journal assembly, joint assembly, and wheel axle assembly at the corresponding positions on the testing platform;

[0023] Step 1.2: Based on the axis of the journal of the buffer support, form a reference axis, install the journal onto the stop pin of the journal assembly, keep the buffer support in a neutral position, and then fix the journal through the journal assembly;

[0024] Step 1.3: Install the connector detection mandrel in the anti-torsion arm hole on the rotating sleeve of the buffer support, and form points B and B1 at both ends of the axis of the connector detection mandrel respectively.

[0025] Step 1.4: Install the wheel axle detection mandrel in the wheel axle hole of the buffer support, and place the wheel axle detection mandrel on the wheel axle assembly, forming points C and C1 at both ends of the axis of the wheel axle detection mandrel respectively;

[0026] Step 2, begin testing

[0027] Step 2.1: Measure the parallelism of the anti-torsion arm hole axis relative to the reference axis, and then set a distance L1 along the first direction and a distance L2 perpendicular to the detection platform between the joint assembly and the anti-torsion arm hole axis.

[0028] Step 2.1.1: Measure and record the distance L1 at points B and B1 respectively, and calculate the difference between the two measurements of distance L1. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified.

[0029] Step 2.1.2: Measure and record the distance L2 at points B and B1 respectively, and calculate the difference between the two measurements of distance L2. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified.

[0030] Step 2.2: Measure the parallelism of the wheel axle axis relative to the reference axis. Then, set a distance L3 along the first direction and a distance L4 perpendicular to the detection platform between the wheel axle assembly and the wheel axle axis.

[0031] Step 2.2.1: Measure and record the distance L3 at points C and C1 respectively, and calculate the difference between the two measurements of distance L3. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified.

[0032] Step 2.2.2: Detect and record the distance L4 at points C and C1 respectively, and calculate the difference between the two measured distances L4. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified.

[0033] Step 3: Disassemble the buffer support, output the test results, and complete the test.

[0034] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0035] 1. The testing platform of the aforementioned testing device has high versatility and can be used for the installation and testing of multiple types of front landing gear buffer struts;

[0036] Second, by setting the spacing L, the position of the buffer support in the journal assembly is ensured and effectively positioned, which is conducive to forming the reference axis A-A1;

[0037] 3. The testing platform is equipped with a group of holes for positioning various types of buffer supports. Multiple groups of holes share hole 01 (reference hole), and the remaining groups of holes are used to position the joint assembly and wheel axle assembly respectively. Thus, the distance between hole 01 and the reference surface on the positioning joint assembly and wheel axle assembly can be customized. Then, by measuring the distance between each reference surface on the joint assembly and wheel axle assembly and the corresponding axis, the offset and the total length of the reference axis (i.e., the journal axis) and the wheel axle axis can be effectively detected, thus obtaining the test index that best reflects the quality performance of the buffer support.

[0038] Fourth, the detection device simplifies the complex detection over ultra-long distances into a controllable indirect detection over short distances between reference surfaces on each axis and the side components, making it easy to operate. Attached Figure Description

[0039] Figure 1 A three-dimensional structural schematic diagram of the overall detection device for the front landing gear buffer strut provided by the present invention;

[0040] Figure 2 A front projection structural schematic diagram of the overall detection device for the front landing gear buffer strut provided by the present invention;

[0041] Figure 3 This is a schematic diagram of the testing platform.

[0042] Figure 4 This is a three-dimensional structural diagram of the journal assembly;

[0043] Figure 5 This is a schematic diagram of the front projection structure of the journal assembly;

[0044] Figure 6 This is a side projection diagram of the journal assembly.

[0045] Figure 7 Schematic diagram of the stop pin structure;

[0046] Figure 8 This is a schematic diagram of the pressure plate structure;

[0047] Figure 9 This is a schematic diagram of the connector assembly.

[0048] Figure 10 A schematic diagram of the supporting structure;

[0049] Figure 11 This is a schematic diagram of the wheel and axle assembly. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0051] like Figure 1 , Figure 2 As shown, this embodiment provides a front landing gear buffer strut overall testing device including a testing platform 1, a journal assembly 2, a joint testing mandrel 3, screws 4, pins 5, a joint assembly 6, a support assembly 7, a wheel axle assembly 8, and a wheel axle testing mandrel 9. The journal assembly 2, joint assembly 6, support assembly 7, and wheel axle assembly 8 are sequentially arranged on the testing platform 1 along a first direction X. The journal assembly 2, joint assembly 6, support assembly 7, and wheel axle assembly 8 are independent of each other on the testing platform 1, and their installation and disassembly are separate. For testing front landing gear buffer struts of the same series, only the testing mandrel and the stop pin need to be replaced.

[0052] The testing platform 1 can be used for the installation and testing of various types of front landing gear buffer struts. The testing platform 1 is relatively large, and its bottom is installed inside the factory building, leveled by multiple jacks to achieve a flatness of 0.07mm. The working surface is designed with multiple M12-6H threaded holes according to the front landing gear type, with a threaded hole spacing tolerance of ±0.1mm.

[0053] like Figure 3 As shown, the detection platform 1 is provided with a first group of holes for detecting and positioning a first type of buffer support column, a second group of holes for detecting and positioning a second type of buffer support column, and a third group of holes for detecting and positioning a third type of buffer support column. Figure 3 The numbers in the diagram are simply the sequential numerical numbers of the holes (marked on the actual object on inspection platform 1) and are unrelated to the part numbers. Holes 01 and 02 are shared by the three types of buffer struts. Holes 01 and 02, 03 and 04, and 05 and 06 are used for the inspection and positioning of one type of nose landing gear buffer strut; 01 and 02, 07 and 08, and 09 and 10 are used for the inspection and positioning of another type of nose landing gear buffer strut; and 11 and 12, 13 and 14, and 15 and 16 are used for the inspection and positioning of the third type of nose landing gear buffer strut.

[0054] The testing platform 1 is designed with multiple threaded holes and positioning holes, with bushings inserted into the positioning holes for a tight fit. The positioning hole spacing and connection hole spacing on the first base plate 2-14-2 of the journal assembly 2 are designed based on the φ12H6 positioning bushing hole and threaded connection hole positions of the testing platform 1, and are positioned by two pins 5 and connected by screws 4. Similarly, the joint bracket 6-1 of the joint assembly 6 and the wheel axle support 8-1 of the wheel axle assembly 8 are also designed and installed; the support assembly 7 can move on the testing platform 1, depending on the size of the front landing gear buffer strut, and is supported on the outer diameter of the piston rod by the 7-2-1 surface.

[0055] The detection platform 1 has a first direction X and a second direction Y, and the first direction X and the second direction Y are perpendicular to each other on the same top projection plane.

[0056] like Figures 4-6 As shown, the journal assembly 2 includes a bracket 2-14, a axial pressing assembly 21, and a side-pushing assembly 22. The axial pressing assembly 21 and the side-pushing assembly 22 fix the journal 101 in a two-pressing-one-pushing manner. The bracket 2-14 includes an upper plate 2-14-1, a first base plate 2-14-2, a vertical plate 2-14-3, and a stiffening plate 2-14-4. The upper plate 2-14-1 and the first base plate 2-14-2 are spaced apart vertically, and the vertical plate 2-14-3 connects the two. The stiffening plate 2-14-4 connects the upper plate 2-14-1, the first base plate 2-14-2, and the vertical plate 2-14-3. The first base plate 2-14-2 is designed with four Ф13 holes and two Ф18H7 bushing mounting holes (hole 01, hole 02). Bushings 2-15 are provided in the bushing mounting holes for the installation and positioning of the entire journal assembly 2 on the testing platform 1.

[0057] The first base plate 2-14-2 is mounted on the testing platform 1 and extends along the second direction Y. A shaft pressure assembly 21 is provided at each end of the upper plate 2-14-1. The shaft pressure assembly 21 includes a V-block 2-13, a pressure plate 2-10, an ear 2-6, a first hinge bolt 2-4, a second hinge bolt 2-11, and a handle nut 2-9. The bottom of the V-block 2-13 is positioned on the upper plate 2-14-1 of the bracket 2-14 by a large cylindrical pin 2-12, and then fixed by screws 4. The top of the V-block 2-13 forms a V-shaped opening.

[0058] There are four stop pins 2-8 in total. They are installed in pairs, with an H7 / r6 press fit, onto the two 90° inclined surfaces of the V-block 2-13. Small cylindrical pins 2-7 are inserted into the V-block 2-13 to abut against the stop pins 2-8, preventing rotation of the stop pins 2-8. Figure 7As shown, the stop pin 2-8 includes a rod and a head. The rod has an anti-rotation hole for inserting a small cylindrical pin 2-7, and the head is square-shaped, with one side of the square head serving as a reference surface 2-8-1. Figure 5 , Figure 7 As shown, the reference surface 2-8-1 faces the center of the journal assembly 2. During testing, the reference surface 2-8-1 serves as the positioning surface for the outer end face 1011 of the journal 101. After the journal 101 is placed on the stop pin 2-8, its axis forms a reference axis (i.e., the journal axis) A-A1. The reference axis A-A1 serves as a reference and remains stationary after the buffer support 10 is in a neutral position and has been positioned and clamped.

[0059] The design of journal assembly 2 requires strict control of the center distance L from the reference surface 2-8-1 on the axial compression assembly 21 near hole 01 to the Ф12 bushing hole (hole 01). Figure 5 As shown), the tolerance is within ±0.05. The center distance between the two Ф12 bushing holes (holes 01 and 02) is 500±0.01. Inserting the pin 5 ensures reliable positioning of the journal assembly 2 and high repeatability.

[0060] The pressure plate 2-10 is located above the V-block 2-13. The lug 2-6 is hinged to one end of the V-block 2-13 via a large cylindrical pin 2-12, and the lug 2-6 can rotate within a certain range around the large cylindrical pin 2-12. The threaded end of the first hinge bolt 2-4 is connected to the threaded hole on the lug 2-6, and the other end is hinged to the pressure plate 2-10 via the large cylindrical pin 2-12. The flat nut 2-5 is locked after the first hinge bolt 2-4 is adjusted into place, and the first hinge bolt 2-4 is locked at its medium length. The second hinge bolt 2-11 is longer than the first hinge bolt 2-4. The second hinge bolt 2-11 is installed on the V-block 2-13 via the large cylindrical pin 2-12, and the threaded end is tightened via the handle nut 2-9 to fix the pressure plate 2-10. Bushing 2-15 is press-fitted to the bottom surface of support 2-14 with H7 / r6 for positioning journal assembly 2 on inspection platform 1.

[0061] like Figure 4 , Figure 8 As shown, the end of the pressure plate 2-10 away from the first hinge bolt 2-4 has an opening 2-101, and the second hinge bolt 2-11 can rotate and be engaged in the opening 2-101. The surface of the pressure plate 2-10 opposite to the V-shaped opening is an arc-shaped surface 2-102.

[0062] The side-push assembly 22 is located near hole 01 and beside the axial pressure assembly 21. The side-push assembly 22 includes a pressure block 2-1, a base 2-2, and a clamping handle 2-3. The bottom of the base 2-2 is bolted to the upper plate 2-14-1, and the upper end of the base 2-2 is horizontally bolted to the clamping handle 2-3. The pressure block 2-10 is provided at the end of the clamping handle 2-3 facing the reference surface 2-8-1 that forms the spacing L. By rotating the clamping handle 2-3, it can be axially extended or retracted to abut or release from the inner end face 1012 of the journal 101.

[0063] like Figure 1 , Figure 9 As shown, the connector assembly 6 includes a second base plate 6-1, a first bushing 6-2, a measuring block 6-3, and a connector bracket 6-4. The second base plate 6-1 has at least one through hole at each end in the second direction. The first bushing 6-2 is housed within each through hole, and the first bushing 6-2 is press-fitted with the through hole on the connector bracket 6-4 at an H7 / r6 angle. The distance between the two bushing holes (holes 03 and 04) is 500 ± 0.01. A pin 5 is inserted into the first bushing 6-2 and press-fitted with the holes 03 and 04 on the detection platform 1 at an H7 / r6 angle for positioning. The connector bracket 6-4 is spaced apart on the second base plate 6-1, and forms an L-shaped vertical side 6-5 and a horizontal side 6-6 at its upper end. The horizontal side 6-6 is located below the vertical side 6-5 and is positioned closer to the journal assembly 2. A measuring block 6-3 is respectively installed on the vertical side 6-5 and the horizontal side 6-6. The outer surface of the measuring block 6-3 on the vertical side 6-5 forms a first measuring surface 61, and the lower surface of the measuring block 6-3 on the horizontal side 6-6 forms a second measuring surface 62. The measuring block 6-3 includes a small-end cylinder and a large-end cylinder arranged sequentially. The small-end cylinder is pressed into the connector bracket 6-4 at an H7 / r6 angle, and the outer surface of the large-end cylinder forms measuring surfaces L1 and L2.

[0064] like Figure 2 As shown, the connector detection mandrel 3 passes through the anti-torsion arm hole of the rotating sleeve 103, and the axis of the connector detection mandrel 3 forms the anti-torsion arm hole axis B-B1. A measurement distance L1 is provided between the first measuring surface 61 and the anti-torsion arm hole axis B-B1. A measurement distance L2 is provided between the second measuring surface 62 and the anti-torsion arm hole axis B-B1.

[0065] like Figure 1 , Figure 2 and Figure 10As shown, the support assembly 7 includes a support base 7-1 and a support 7-2. The bottom of the support base 7-1 rests on the detection platform 1, and the top is provided with a U-shaped groove 7-1-1. The support 7-2 is a rectangular tube, which is placed in the U-shaped groove 7-1-1. The top surface 7-2-1 of the support 7-2 contacts the outer surface of the piston rod 104, so that after the journal 101 is positioned, the buffer support 10 is kept in a neutral position. The support assembly 7 can slide to any desired position on the detection platform 1.

[0066] like Figure 1 , Figure 2 and Figure 11 As shown, the wheel axle assembly 8 includes a third base plate 8-1, a U-shaped seat 8-2, a second bushing 8-5, and a wheel axle support 8-6. The third base plate 8-1 has at least one through hole at each end in the second direction. The second bushing 8-5 is installed in each through hole, and a pin 5 is inserted into the second bushing 8-5 for positioning with the detection platform 1. The wheel axle supports 8-6 are spaced apart on the third base plate 8-1, and the U-shaped seat 8-2 is installed at the upper end of the wheel axle support 8-6. The wheel axle detection spindle 9 is fitted into the U-shaped seat 8-2. A third measuring surface 81 and a fourth measuring surface 82 are formed on the U-shaped seat 8-2. A measuring distance L3 is set between the third measuring surface 81 and the wheel axle axis C-C1. A measuring distance L4 is set between the fourth measuring surface 82 and the wheel axle axis C-C1.

[0067] The first measuring surface 61 and the third measuring surface 81 are both vertically arranged, and the second measuring surface 62 and the fourth measuring surface 82 are both parallel to the detection platform 1.

[0068] The third base plate 8-1 is positioned and connected to the detection platform 1 by inserting four screws 4 and two pins 5 into the corresponding holes 05 and 06.

[0069] The present invention also provides a detection method for the overall inspection of the nose landing gear buffer strut, which uses the above-mentioned nose landing gear buffer strut overall inspection device and includes:

[0070] Step 1: Install the buffer support pillars

[0071] Step 1.1: Based on the model of the buffer support to be tested, position the journal assembly 2, joint assembly 6, and wheel axle assembly 8 at the corresponding positions on the testing platform 1. Place the support assembly 7 on the testing platform 1 and adjust it between the joint assembly 3 and the wheel axle assembly 8, ensuring that the width direction is symmetrical with respect to the wheel axle assembly 8.

[0072] Step 1.2: Based on the axis of the journal 101 of the buffer support 10, form a reference axis A-A1. Install the journal 101 onto the stop pin 2-8 of the journal assembly 2. Place the piston rod 104 on the support 7-2 of the support assembly 7, so that the buffer support 10 is in a neutral position. Use the clamping handle 2-3 of the journal assembly 2 to axially press the inner end face 1012 of the journal 101 to lock the reference surface 2-8-1. Rotate the pressure plate 2-10 and tighten the handle nut 2-9.

[0073] Step 1.3: Install the connector detection mandrel 3 (with an H9 / f8 clearance fit to the anti-torsion arm hole) in the anti-torsion arm hole on the rotating sleeve 103 of the buffer support 10, so that both ends of the mandrel extend out of the anti-torsion arm mounting hole. Points B and B1 are formed at both ends of the axis of the connector detection mandrel 3.

[0074] Step 1.4: Install the wheel axle detection mandrel 9 (with H8 / f7 clearance fit with the wheel axle hole) in the wheel axle hole 105 of the buffer support 10, and place the wheel axle detection mandrel 9 on the wheel axle assembly 8, forming points C and C1 at both ends of the axis of the wheel axle detection mandrel 9 respectively.

[0075] Step 2, begin testing

[0076] Step 2.1: Measure the parallelism of the anti-torsion arm hole axis B-B1 relative to the reference axis A-A1. Then, set a distance L1 along the first direction and a distance L2 perpendicular to the detection platform 1 between the joint assembly 6 and the anti-torsion arm hole axis B-B1.

[0077] Step 2.1.1: Measure and record the distance L1 at points B and B1 respectively. Calculate the difference between the two measurements of distance L1. If the difference is lower than the set acceptable value, it is acceptable; if it is higher than the set acceptable value, it is unacceptable. For example, a measurement difference of no more than 0.2mm over a 100mm length is acceptable. If the difference between the two measurements is no more than 0.2mm, the straight-line distance between the anti-torsion arm hole axis B-B1 and the reference axis A-A1 is acceptable.

[0078] Step 2.1.2: Measure and record the distance L2 at points B and B1 respectively. Calculate the difference between the two measurements of distance L2. If the difference is lower than the set acceptable value, it is acceptable; if it is higher than the set acceptable value, it is unacceptable. For example, a measurement difference of no more than 0.2mm over a 100mm length is acceptable. If the difference between the two measurements is no more than 0.2mm, then the parallelism and skewness of the anti-torsion arm hole axis B-B1 relative to the reference axis A-A1 are acceptable.

[0079] Step 2.2: Measure the parallelism of the wheel axle axis C-C1 relative to the reference axis A-A1. Then, set a distance L3 along the first direction and a distance L4 perpendicular to the detection platform 1 between the wheel axle assembly 8 and the wheel axle axis C-C1.

[0080] Step 2.2.1: Measure and record the distance L3 at points C and C1 respectively. Calculate the difference between the two measurements of distance L3. If the difference is lower than the set acceptable value, it is acceptable; if it is higher than the set acceptable value, it is unacceptable. For example, a difference of no more than 0.3mm over a 100mm length and no more than 1.5mm over a 200mm length is acceptable. Perform at least three measurements, then take the arithmetic mean of L3. If the difference between the average values ​​is no more than 1.5mm, the distance between the wheel axle axis C-C1 and the reference axis A-A1 is acceptable.

[0081] Step 2.2.2: Measure and record the distance L4 at points C and C1 respectively. Calculate the difference between the two measurements of distance L4. If the difference is lower than the set acceptable value, it is acceptable; if it is higher than the set acceptable value, it is unacceptable. For example, a difference between the measurements of points C and C1 of no more than 0.3mm over a length of 100mm and no more than 1.5mm over a length of 200mm is acceptable. If the difference between the two measurements is no more than 1.5mm, then the parallelism between the wheel axle axis C-C1 and the reference axis A-A1 is acceptable.

[0082] If any of the measured values ​​L1, L2, L3, or L4 fails to meet the standard, the test result is considered unqualified.

[0083] L1, L2, L3, and L4 can perform multiple tests.

[0084] Step 3: Remove the joint inspection mandrel 3 and the wheel axle inspection mandrel 9. Loosen the clamping handle 2-3 and pressure block 2-1 in the reverse direction, and move them axially along the journal 101 to loosen the inner end face 1012 of the journal. Then loosen the handle nut 2-9 and rotate the second hinge bolt 2-11 outward around the large cylindrical pin 2-12. Rotate the pressure plate 2-10 in the reverse direction around the other large cylindrical pin 2-12, disassemble the buffer support 10, and the entire inspection is complete.

[0085] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A device for detecting the overall structure of a nose landing gear buffer strut, characterized in that, The device includes a testing platform (1), a wheel axle testing spindle (9), a joint testing spindle (3) for passing through the anti-torsion arm hole on the buffer support, and a journal assembly (2), a joint assembly (6) and a wheel axle assembly (8) arranged sequentially on the testing platform (1) along a first direction. The journal assembly (2) is provided with a stop pin (2-8) for positioning the journal on the buffer support and forming the axis of the journal into a reference axis (A-A1). The journal assembly (2) is provided with a positioning dimension L in a second direction. One end of the positioning dimension L falls on one side of the stop pin (2-8). The first direction and the second direction are perpendicular to each other on the same top projection plane. The centerline of the joint detection mandrel (3) forms the anti-torsion arm hole axis (B-B1). The joint assembly (6) is provided with a vertical side (6-5) and a horizontal side (6-6). A measuring block (6-3) is installed on the vertical side (6-5) and the horizontal side (6-6) respectively. The outer surface of the measuring block (6-3) on the vertical side (6-5) forms a first measuring surface (61) for measuring the distance L1 between the measuring block (6-3) and the anti-torsion arm hole axis (B-B1). The lower surface of the measuring block (6-3) on the horizontal side (6-6) forms a second measuring surface (62) for measuring the distance L2 between the measuring block (6-3) and the anti-torsion arm hole axis (B-B1) of the buffer support. The top of the wheel axle assembly (8) is provided with the wheel axle detection spindle (9) for passing through the wheel axle on the buffer support. The center line of the wheel axle detection spindle (9) forms the wheel axle axis (C-C1). The wheel axle assembly (8) is provided with a U-shaped seat (8-2). The U-shaped seat (8-2) is provided with a third measuring surface (81) for measuring the distance L3 between the wheel axle and the wheel axle axis (C-C1) and a fourth measuring surface (82) for measuring the distance L4 between the wheel axle and the wheel axle axis (C-C1). The first measuring surface (61) and the third measuring surface (81) are both vertically arranged, and the second measuring surface (62) and the fourth measuring surface (82) are both parallel to the detection platform (1); The detection platform (1) is provided with a first hole group for detecting and positioning the first type of buffer support, a second hole group for detecting and positioning the second type of buffer support, and a third hole group for detecting and positioning the third type of buffer support. The three hole groups share hole 01 and hole 02. Hole 01 and hole 02 are located close to the journal assembly (2), and the center line of hole 01 and one side of the stop pin (2-8) form the positioning dimension L.

2. The nose landing gear buffer strut overall detection device according to claim 1, characterized in that, The journal assembly (2) includes a bracket (2-14), a axial pressing assembly (21), and a side pushing assembly (22). The bracket (2-14) has one axial pressing assembly (21) at each end in the second direction. The stop pin (2-8) is installed on the axial pressing assembly (21). The side pushing assembly (22) is located on the side of the axial pressing assembly (21) at this end, and the side pushing assembly (22) extends and retracts axially in the direction of the positioning dimension L.

3. The nose landing gear buffer strut overall detection device according to claim 2, characterized in that, The axial compression assembly (21) includes a V-block (2-13), a pressure plate (2-10), an ear (2-6), a first hinge bolt (2-4), a second hinge bolt (2-11), and a handle nut (2-9). The bottom of the V-block (2-13) is mounted on the bracket (2-14), and the top forms a V-shaped opening. The stop pin (2-8) is located on the two side walls of the V-shaped opening. The pressure plate (2-10) is located above the V-block (2-13), and the ear (2-6) is hinged to the V-block (2-13). The first hinge bolt (2-4) is connected to the lug (2-6) and hinged to the pressure plate (2-10); the second hinge bolt (2-11) is hinged to the other end of the V-block (2-13), the handle nut (2-9) is threaded to the second hinge bolt (2-11), and the pressure plate (2-10) has an opening (2-101) at the end away from the first hinge bolt (2-4), and the second hinge bolt (2-11) can rotate and be engaged in the opening (2-101).

4. The nose landing gear buffer strut overall detection device according to claim 3, characterized in that, The surface of the pressure plate (2-10) opposite to the V-shaped opening is an arc-shaped surface (2-102).

5. The nose landing gear buffer strut overall detection device according to claim 1, characterized in that, The connector assembly (6) includes a second base plate (6-1), a first bushing (6-2), and a connector bracket (6-4). The second base plate (6-1) has at least one through hole at each end in the second direction. The first bushing (6-2) is provided in the through hole. A pin (5) is inserted into the first bushing (6-2) and positioned with the detection platform (1). The connector bracket (6-4) is arranged at intervals on the second base plate (6-1), and an L-shaped vertical side (6-5) and a horizontal side (6-6) are formed at the upper end of the connector bracket (6-4).

6. The nose landing gear buffer strut overall detection device according to claim 5, characterized in that, The horizontal edge (6-6) is located at the lower end of the vertical edge (6-5), and the horizontal edge (6-6) is positioned closer to the journal assembly (2).

7. The nose landing gear buffer strut overall detection device according to claim 1, characterized in that, The wheel axle assembly (8) includes a third base plate (8-1), a second bushing (8-5), and a wheel axle support (8-6). The third base plate has at least one through hole at each end in the second direction. The second bushing (8-5) is provided in the through hole. A pin (5) is inserted into the second bushing (8-5) to position it with the detection platform (1). The wheel axle supports (8-6) are spaced apart on the third base plate (8-1). The U-shaped seat (8-2) is installed on the upper end of the wheel axle support (8-6). The wheel axle detection spindle (9) is clamped in the U-shaped seat (8-2).

8. The nose landing gear buffer strut overall detection device according to claim 1, characterized in that, It also includes a support assembly (7) for bottom support of the buffer strut, the support assembly (7) being mounted on the detection platform (1) and located between the joint assembly (6) and the wheel axle assembly (8).

9. A method for inspecting the overall structure of the nose landing gear buffer strut, comprising using the nose landing gear buffer strut overall inspection device as described in any one of claims 1-8, characterized in that, include: Step 1: Install the buffer support pillars Step 1.1: Based on the model of the buffer support to be tested, position the journal assembly (2), joint assembly (6) and wheel axle assembly (8) at the corresponding positions on the testing platform (1). Step 1.2: Based on the axis of the journal (101) of the buffer support (10), form a reference axis (A-A1), install the journal (101) onto the stop pin (2-8) of the journal assembly (2), keep the buffer support (10) in a neutral position, and then fix the journal (101) through the journal assembly (2); Step 1.3, install the connector detection mandrel (3) in the anti-torsion arm hole on the rotating sleeve (103) of the buffer support (10), and form points B and B1 at both ends of the axis of the connector detection mandrel (3); Step 1.4: Install the wheel axle detection mandrel (9) in the wheel axle hole (105) of the buffer support (10), and place the wheel axle detection mandrel (9) on the wheel axle assembly (8), forming points C and C1 at the two ends of the axis of the wheel axle detection mandrel (9); Step 2, begin testing Step 2.1, measure the parallelism of the anti-torsion arm hole axis (B-B1) relative to the reference axis (A-A1), then set a distance L1 along the first direction and a distance L2 perpendicular to the detection platform (1) between the joint assembly (6) and the anti-torsion arm hole axis (B-B1); Step 2.1.1: Measure and record the distance L1 at points B and B1 respectively, and calculate the difference between the two measurements of distance L1. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified. Step 2.1.2: Measure and record the distance L2 at points B and B1 respectively, and calculate the difference between the two measurements of distance L2. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified. Step 2.2, measure the parallelism of the wheel axle axis (C-C1) relative to the reference axis (A-A1), then set a distance L3 along the first direction and a distance L4 perpendicular to the detection platform (1) between the wheel axle assembly (8) and the wheel axle axis (C-C1); Step 2.2.1: Measure and record the distance L3 at points C and C1 respectively, and calculate the difference between the two measurements of distance L3. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified. Step 2.2.2: Detect and record the distance L4 at points C and C1 respectively, and calculate the difference between the two measured distances L4. If the difference is lower than the set qualified value, it is qualified; if it is higher than the set qualified value, it is unqualified. Step 3: Disassemble the buffer support, output the test results, and complete the test.

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