A compression strength detection system and method for landing gear combined fork arm
By designing the material loading component and the compressive strength testing component to work in tandem, comprehensive testing of the landing gear combination fork arm was achieved, solving the problem of incomplete testing in existing systems and improving the accuracy and versatility of the testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGSU SUNYO AEROSPACE CO LTD
- Filing Date
- 2026-05-21
- Publication Date
- 2026-08-04
AI Technical Summary
The existing landing gear combination fork arm compressive strength testing system cannot effectively test the connection points of the upper and lower anti-torsion arms at different locations and at different deployment angles, resulting in incomplete testing and potential safety hazards.
A system including a material loading component and a compressive strength testing component was designed. The material loading component can adjust the fork arm deployment angle, and the compressive strength testing component can detect the dynamic load compressive strength of the anti-torsion arm at different positions and angles. Flexible testing is achieved through a suspension reset mechanism, a hammer box, an adjustable dynamic load and a counterweight adjustment mechanism.
It enables comprehensive testing of landing gear combination forks, and the test results are consistent with actual working conditions, improving the accuracy and reliability of the test. It can adapt to dynamic load compressive strength testing under different positions and working conditions, and improves the versatility of the testing system.
Smart Images
Figure CN122238060B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of landing gear component manufacturing technology, specifically relating to a system and method for testing the compressive strength of a landing gear combination fork arm. Background Technology
[0002] The landing gear combination fork arm consists of an upper anti-torsion arm and a lower anti-torsion arm. Its main function is to prevent relative rotation between the inner and outer cylinders of the shock absorber strut, thereby ensuring the structural stability of the landing gear and the correct wheel positioning when under stress or sliding on the ground. During the production process of the landing gear combination fork arm, its compressive strength needs to be tested to ensure that it meets the design safety margin and avoids safety hazards caused by material defects or processing errors.
[0003] The existing landing gear combination arm compressive strength testing system has shortcomings in use. First, it cannot test the dynamic load compressive strength of the upper and lower anti-torsion arms that make up the landing gear combination arm at different positions. Second, it cannot test the dynamic load compressive strength at the connection between the upper and lower anti-torsion arms under different deployment angles.
[0004] In view of this, the inventors hope to optimize and improve the existing landing gear combination fork arm compressive strength testing system. Summary of the Invention
[0005] The purpose of this invention is to overcome the above-mentioned problems in the prior art and to provide a system and method for testing the compressive strength of a landing gear combination fork arm.
[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: This invention provides a compressive strength testing system for a landing gear combination fork arm, comprising: A loading assembly for loading the combined fork arm and adjusting the unfolding angle of the combined fork arm according to detection requirements; A compressive strength testing component is used to test the dynamic compressive strength of the two anti-torsion arms at different positions in a combined forklift, as well as the dynamic compressive strength of the hinge at the connection point under different deployment angles. The component includes a suspension reset mechanism, a hammer box, an adjustable dynamic load, and a counterweight adjustment mechanism. The hammer box is supported by the suspension reset mechanism and can move horizontally with it. The adjustable load, which is slidably limited within the hammer box, consists of a counterweight frame, a hammer rod, a roller frame, a pressure head component, and an adjustment motor. The system comprises a gearbox and counterweights. A roller frame is connected to the lower side of the counterweight frame via a hammer rod. A support roller shaft, housing a pressure head component, is movably supported within the roller frame. An adjusting motor is mounted on the outer side of the roller frame. The output shaft of the adjusting motor is connected to the support roller shaft via a steering gear set located in the gearbox. Multiple counterweights are mounted side-by-side in the counterweight frame. The suspension reset mechanism can adjust the height of the adjustable counterweight frame. A counterweight adjustment mechanism is installed on the side of the hammer box to adjust the number of counterweights in the counterweight frame.
[0007] Furthermore, in the above-mentioned landing gear combined fork arm compressive strength testing system, the combined fork arm includes two anti-torsion arms, the inner ends of the two anti-torsion arms are hinged together by a hinge, and the outer end of each anti-torsion arm is provided with a hinge lug, and the hinge lug is provided with a hinge hole.
[0008] Furthermore, in the aforementioned landing gear combined fork arm compressive strength testing system, the loading assembly includes a loading base plate, a lifting push rod, a lateral bidirectional displacement mechanism, a longitudinal bidirectional displacement mechanism, a positioning plug, and a hinge support mechanism; the loading base plate is supported by the lifting push rod on the lateral bidirectional displacement mechanism, and two longitudinal bidirectional displacement mechanisms capable of relative lateral displacement are installed on the lateral bidirectional displacement mechanism. Each longitudinal bidirectional displacement mechanism is equipped with two positioning plugs capable of relative longitudinal displacement. The shape of the positioning plug matches the shape of the hinge hole in the hinge ear plate. A hinge support mechanism for supporting the hinge is installed in the middle of the lateral bidirectional displacement mechanism.
[0009] Furthermore, in the aforementioned landing gear combined fork arm compressive strength testing system, the suspension reset mechanism includes a linear guide pair, a suspension frame, an outer frame, a height adjustment screw motor, a height adjustment screw, a movable block, and a dual-axis locking push rod. The slider of the linear guide pair is supported by the outer frame via the suspension frame. The height adjustment screw motor is installed on the upper side plate of the outer frame, and a height adjustment screw is installed at the output end of the height adjustment screw motor. A movable block with restricted rotation is sleeved on the outer side of the height adjustment screw, and a dual-axis locking push rod is installed on the outer side of the movable block. A through hole for the avoidance hammer rod is provided on the lower side plate of the outer frame.
[0010] Furthermore, in the above-mentioned landing gear combined fork arm compressive strength testing system, the hammer box includes a hammer box body installed between the upper and lower side plates of the outer frame. The hammer box body has a rectangular sliding cavity inside. The hammer box body has a push rod clearance groove on the side near the height adjustment screw. The bottom of the hammer box body is bolted with a pressure-bearing lifting block. The upper outer side of the hammer box body has a counterweight block inlet and outlet groove.
[0011] Furthermore, in the above-mentioned landing gear combined fork arm compressive strength testing system, the pressure head component is composed of an inwardly concave pressure head and a flat pressure head arranged opposite to each other. The pressure head component has a through-shaft hole in the middle to facilitate the passage of the support roller shaft, and the inner wall of the through-shaft hole is provided with a keyway.
[0012] Furthermore, in the above-mentioned landing gear combined fork arm compressive strength testing system, the counterweight frame is a rectangular frame structure, one side plate of the counterweight frame is provided with a locking groove that cooperates with the movable rod in the dual-axis locking push rod, the counterweight frame is provided with a material loading groove, the upper and lower walls of the inner cavity of the material loading groove are symmetrically provided with multiple sets of sliding grooves, and the counterweight frame is embedded in the sliding groove with a top ball plunger installed.
[0013] Furthermore, in the above-mentioned landing gear combination fork arm compressive strength testing system, the upper and lower sides of the counterweight block are symmetrically provided with protrusions that slide and are restricted in the sliding groove, the outer side of the protrusion is provided with a positioning hole that cooperates with the top ball plunger, and the left and right sides of the counterweight block are provided with concave clamping grooves.
[0014] Furthermore, in the aforementioned landing gear combined fork arm compressive strength testing system, the counterweight adjustment mechanism includes a tube cover sleeved on the outside of the counterweight block inlet / outlet groove. The inner cavity of the tube cover has multiple sets of extended slide grooves symmetrically formed on its upper and lower walls, corresponding to the slide groove positions. A counterweight adjustment motor is installed on the outside of the tube cover, and the output end of the counterweight adjustment motor is connected to a counterweight adjustment screw. A counterweight adjustment guide rod is fixed in the tube cover, arranged parallel to the counterweight adjustment screw. A push rod mounting block is sleeved on the outer sides of both the counterweight adjustment screw and the counterweight adjustment guide rod. A counterweight adjustment push rod is installed on the push rod mounting block. A mechanical gripper is installed on the movable end of the counterweight adjustment push rod. The mechanical gripper has two relatively displaced grippers, and the width of the grippers matches the width of the concave clamping groove.
[0015] The present invention also provides a method for testing the compressive strength of a landing gear assembly fork arm, which is based on the above-mentioned system for testing the compressive strength of a landing gear assembly fork arm, and includes the following steps: S1. Load the combined fork arm using the loading assembly and adjust the unfolding angle of the combined fork arm to 180 degrees. Use the hinge support mechanism of the loading assembly to support the hinge. Use the compressive strength testing assembly to test the dynamic load compressive strength at different positions of the two anti-torsion arms in the combined fork arm. S2. Load the combined fork arm using the loading assembly, and adjust the unfolding angle of the combined fork arm to 150 degrees, 120 degrees, 90 degrees, 60 degrees and 30 degrees in sequence. Release the hinge support mechanism of the loading assembly from supporting the hinge. Use the compressive strength testing assembly to test the dynamic load compressive strength of the hinge at the connection under different unfolding angles.
[0016] The beneficial effects of this invention are: 1. This invention provides a compressive strength testing system for a landing gear combination fork arm, mainly composed of a load-bearing component and a compressive strength testing component. The load-bearing component can flexibly adjust the deployment angle of the combination fork arm to simulate different postures of the combination fork arm in actual use, ensuring that the test results are highly consistent with the actual working scenario, and improving the accuracy and reliability of the test. The compressive strength testing component can perform dynamic load compressive strength testing on different positions of the two anti-torsion arms of the combination fork arm, and can also test the dynamic load compressive strength of the hinge at the connection of the two anti-torsion arms under different deployment angles, covering the key parts and working conditions that the combination fork arm may bear pressure in actual operation, providing comprehensive testing.
[0017] 2. The compressive strength testing component is rationally designed, mainly consisting of a counterweight frame, hammer rod, roller frame, pressure head component, adjusting motor, gear box, and counterweight blocks. Through the coordinated operation of the suspension reset mechanism and the counterweight adjustment mechanism, the release height of the dynamic load and the number of counterweight blocks can be adjusted, thereby flexibly changing the magnitude of the impact energy. Simultaneously, the pressure head component integrates a concave pressure head and a flat pressure head, which can be quickly switched via the adjusting motor, perfectly adapting to the stress requirements of different testing surfaces such as the curved surface of the anti-torsion arm or the flat part of the hinge. This multi-dimensional adjustment capability ensures that the system can provide corresponding dynamic load loading schemes for dynamic load compressive strength testing at different locations and under different working conditions, improving the versatility of the testing system.
[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the combined fork arm structure in this invention; Figure 3 This is a schematic diagram of the material loading assembly in this invention; Figure 4 This is a schematic diagram of the first usage state of the material loading component in this invention; Figure 5 This is a schematic diagram of the second usage state of the material loading component in this invention; Figure 6 This is a schematic diagram of the compressive strength testing component in this invention; Figure 7 This is a schematic diagram of the suspension reset mechanism at one angle in this invention; Figure 8 This is a schematic diagram of the suspension reset mechanism from another angle in this invention; Figure 9 This is a schematic diagram of the hammer box structure in this invention; Figure 10 This is a schematic diagram of the adjustable load structure in this invention; Figure 11 This is a schematic diagram of the pressure head component in this invention; Figure 12 This is a schematic diagram of the counterweight frame in this invention; Figure 13 This is a schematic diagram of the counterweight block in this invention; Figure 14 This is a schematic diagram of the counterweight adjustment mechanism in this invention; Figure 15 This is a schematic diagram of the internal structure of the counterweight adjustment mechanism in this invention; In the attached diagram, the components represented by each number are as follows: 1-Combined fork arm, 101-Anti-torsion arm, 102-Hinge, 103-Hinged lug; 2-Material carrier assembly, 201-Material carrier base plate, 202-Lifting push rod, 203-First channel plate, 204-Support base, 205-First bidirectional lead screw, 206-First lead screw motor, 207-First carrier plate, 208-Second channel plate, 209-Second bidirectional lead screw, 210-Second lead screw motor, 211-Second carrier plate, 212-Positioning plug, 213-Height adjustment push rod, 214-Hinge support block; 3-Compressive strength testing component, 31-Suspension reset mechanism, 311-Linear guide pair, 312-Suspension frame, 313-Outer frame, 314-Height adjustment screw motor, 315-Height adjustment screw, 316-Moving block, 317-Dual-axis locking push rod, 318-Perforation, 32-Hammer box, 321-Hammer box body, 322-Rectangular slide cavity, 323-Push rod clearance groove, 324-Bolt, 325-Pressure-bearing lifting block, 326-Counterweight block inlet / outlet groove, 33-Adjustable load, 331-Counterweight frame, 331a-Locking groove, 331b-Material trough, 331c-Slide groove, 331 d-Top ball plunger, 332-Hammer rod, 333-Roller frame, 334-Pressure head component, 334a-Concave pressure head, 334b-Flat pressure head, 334c-Through shaft hole, 335-Adjusting motor, 336-Gear box, 337-Counterweight block, 337a-Protrusion, 337b-Positioning hole, 337c-Concave clamping groove, 34-Counterweight adjustment mechanism, 341-Tube cover, 342-Extended slide, 343-Counterweight adjustment motor, 344-Counterweight adjustment screw, 345-Counterweight adjustment guide rod, 346-Push rod mounting block, 347-Counterweight adjustment push rod, 348-Mechanical gripper. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] like Figure 1 As shown, this embodiment provides a compressive strength testing system for a landing gear combination fork arm, including a loading assembly 2 and a compressive strength testing assembly 3; the loading assembly 2 is used to load the combination fork arm 1 and adjust the deployment angle of the combination fork arm 1 according to the testing requirements; the compressive strength testing assembly 3 is used to test the dynamic load compressive strength at different positions of the two anti-torsion arms 101 in the combination fork arm 1, as well as the dynamic load compressive strength of the hinge 102 at the connection point under different deployment angles.
[0023] like Figure 2As shown, the combined fork arm 1 includes two anti-torsion arms 101, the inner ends of which are hinged together by a hinge 102. Each anti-torsion arm 101 has a hinge ear plate 103 at its outer end, with a hinge hole in the ear plate 103. The hinge 102 enables relative rotation of the two anti-torsion arms 101, facilitating the adjustment of the unfolding angle of the combined fork arm 1 by the material loading assembly 2, adapting to different testing requirements. During testing, the anti-torsion arms 101 and the hinge 102 bear the dynamic load pressure applied by the pressure head component 334. By detecting their deformation under stress, it is determined whether their compressive strength meets the design requirements.
[0024] like Figures 3-5 As shown, the material carrier assembly 2 includes a material carrier base plate 201, a lifting push rod 202, a lateral bidirectional displacement mechanism, a longitudinal bidirectional displacement mechanism, a positioning plug 212, and a hinge support mechanism. The material carrier base plate 201 is supported by the lifting push rod 202 and has a lateral bidirectional displacement mechanism. Two longitudinal bidirectional displacement mechanisms capable of relative lateral displacement are installed on the lateral bidirectional displacement mechanism. Two positioning plugs 212 capable of relative longitudinal displacement are installed on each longitudinal bidirectional displacement mechanism. The shape of the positioning plugs 212 matches the shape of the hinge hole in the hinge ear plate 103. A hinge support mechanism for supporting the hinge 102 is installed in the middle of the lateral bidirectional displacement mechanism.
[0025] In this embodiment, the transverse bidirectional displacement mechanism includes a first channel plate 203, a support base 204, a first bidirectional lead screw 205, a first lead screw motor 206, and a first carrier plate 207. The support base 204 is installed on the inner side of the web of the first channel plate 203. The first bidirectional lead screw 205, which passes through the support base 204, is rotatably supported between the two side plates of the first channel plate 203. The output shaft of the first lead screw motor 206 is connected to the middle part of the first bidirectional lead screw 205 via a steering gear set placed in the support base 204. The first bidirectional lead screw 205 has two first lead screw segments with opposite directions of rotation. The outer side of each first lead screw segment is fitted with a first carrier plate 207 that restricts rotation.
[0026] In this embodiment, the longitudinal bidirectional displacement mechanism includes a second grooved plate 208, a second bidirectional lead screw 209, a second lead screw motor 210, and a second carrier plate 211. The second bidirectional lead screw 209 is rotatably supported between the two side plates of the second grooved plate 208. The second bidirectional lead screw 209 is driven to rotate by the second lead screw motor 210. The second bidirectional lead screw 209 has two second lead screw segments with opposite directions of rotation. The outer side of each second lead screw segment is fitted with a second carrier plate 211 that restricts rotation. The positioning plug 212 is installed on the inner side of the corresponding second carrier plate 211.
[0027] In this embodiment, the hinge support mechanism includes a height adjustment push rod 213 and a hinge support block 214 installed at its movable end. The height adjustment push rod 213 is installed on the upper side of the support base 204, and the upper side of the hinge support block 214 is provided with an arc-shaped groove that matches the shape of the hinge 102 when it is flat.
[0028] The working principle of the material loading assembly 2 is as follows: The material carrier base 201 serves as the mounting foundation for the entire material carrier assembly 2, providing stable support for the lifting push rod 202. The lifting push rod 202 can drive the entire lateral bidirectional displacement mechanism to rise and fall, adapting to different detection requirements. In the lateral bidirectional displacement mechanism, after the first lead screw motor 206 starts, it drives the first bidirectional lead screw 205 to rotate through the steering gear set in the support base 204. Since the first bidirectional lead screw 205 has two first lead screw segments with opposite directions of rotation, and the rotation of the first carrier plate 207 is restricted, the two first carrier plates 207 will make relative lateral displacement along the first groove plate 203, thereby driving the longitudinal bidirectional displacement mechanism installed on the first carrier plate 207 to move laterally, realizing the adjustment of the lateral spacing of the two anti-torsion arms 101 to adapt to different unfolding angle requirements. In the longitudinal bidirectional displacement mechanism, the second lead screw motor 210 drives the second bidirectional lead screw 209 to rotate. The second bidirectional lead screw 209 has two second lead screw sections with opposite directions of rotation, and the rotation of the second carrier plate 211 is restricted. Therefore, the two second carrier plates 211 will make relative longitudinal displacement along the second groove plate 208, driving the positioning plug 212 to move longitudinally. The shape of the positioning plug 212 matches the hinge hole in the hinge ear plate 103. Inserting the positioning plug 212 into the hinge hole can achieve the positioning and fixation of the outer end of the combined fork arm 1, avoiding displacement of the fork arm during the testing process. In the hinge support mechanism, the height adjustment push rod 213 can drive the hinge support block 214 to rise and fall. The arc-shaped groove on the upper side of the hinge support block 214 matches the shape of the hinge 102 when it is flat.
[0029] like Figure 6 and Figure 10As shown, the compressive strength testing component 3 includes a suspension reset mechanism 31, a hammer box 32, an adjustable load 33, and a counterweight adjustment mechanism 34. The hammer box 32 is supported by the suspension reset mechanism 31 and can move horizontally with it. The adjustable load 33 is slidably restricted in the hammer box 32. The adjustable load 33 consists of a counterweight frame 331, a hammer rod 332, a roller frame 333, a pressure head component 334, an adjusting motor 335, a gear box 336, and counterweight blocks 337. The roller frame 333 is connected to the lower side of the counterweight frame 331 via the hammer rod 332. The roller frame 333 movably supports the support roller shaft of the pressure head component 334. The adjusting motor 335 is installed on the outer side of the roller frame 333. The output shaft of the adjusting motor 335 is connected to the support roller shaft via a steering gear set placed in the gear box 336. Multiple counterweight blocks 337 are clamped side by side in the counterweight frame 331. The suspension reset mechanism 31 can adjust the height position of the counterweight frame 331 in the adjustable load 33, and the side end of the hammer box 32 is equipped with a counterweight adjustment mechanism 34 that can adjust the number of counterweight blocks 337 in the counterweight frame 331.
[0030] like Figures 7-8 As shown, the suspension reset mechanism 31 includes a linear guide pair 311, a suspension frame 312, an outer frame 313, a height adjustment screw motor 314, a height adjustment screw 315, a movable block 316, and a dual-axis locking push rod 317. The slider of the linear guide pair 311 is supported by the outer frame 313 via the suspension frame 312. The height adjustment screw motor 314 is installed on the upper side plate of the outer frame 313. The height adjustment screw 315 is installed at the output end of the height adjustment screw motor 314. The movable block 316 with rotation restriction is sleeved on the outer side of the height adjustment screw 315. The dual-axis locking push rod 317 is installed on the outer side of the movable block 316. The lower side plate of the outer frame 313 has a through hole 318 for the avoidance hammer rod 332.
[0031] like Figure 9 As shown, the hammer box 32 includes a hammer box body 321 installed between the upper and lower side plates of the outer frame 313. The hammer box body 321 has a rectangular sliding cavity 322 inside. The hammer box body 321 has a push rod clearance groove 323 on the side near the height adjustment screw 315. The bottom of the hammer box body 321 is equipped with a pressure-bearing lifting block 325 by bolts 324. The upper outer side of the hammer box body 321 has a counterweight block inlet / outlet groove 326.
[0032] like Figure 11 As shown, the pressure head component 334 consists of a concave pressure head 334a and a flat pressure head 334b arranged opposite to each other. The pressure head component 334 has a through-shaft hole 334c in the middle to facilitate the passage of the support roller shaft. The inner wall of the through-shaft hole 334c is provided with a keyway.
[0033] like Figure 12As shown, the counterweight frame 331 is a rectangular frame structure. One side plate of the counterweight frame 331 has a locking groove 331a that cooperates with the movable rod in the dual-axis locking push rod 317. The counterweight frame 331 has a material loading groove 331b. The upper and lower walls of the inner cavity of the material loading groove 331b have multiple sets of sliding grooves 331c symmetrically opened. The counterweight frame 331 is located in the sliding groove 331c and a top ball plunger 331d is embedded and installed.
[0034] like Figure 13 As shown, the counterweight 337 has symmetrical protrusions 337a on its upper and lower sides that are slidably restricted in the groove. The outer side of the protrusion 337a has a positioning hole 337b that cooperates with the top ball plunger 331d. The left and right sides of the counterweight 337 have concave clamping grooves 337c.
[0035] like Figures 14-15 As shown, the counterweight adjustment mechanism 34 includes a tube cover 341 sleeved on the outside of the counterweight block inlet / outlet groove 326. The inner cavity of the tube cover 341 has multiple sets of extended slide grooves 342 symmetrically opened on the upper and lower walls, corresponding to the positions of the slide grooves 331c. A counterweight adjustment motor 343 is installed on the outside of the tube cover 341. The output end of the counterweight adjustment motor 343 is connected to a counterweight adjustment screw 344. A counterweight adjustment guide rod 345 is fixed in the tube cover 341 and arranged parallel to the counterweight adjustment screw 344. A push rod mounting block 346 is sleeved on the outside of the counterweight adjustment screw 344 and the counterweight adjustment guide rod 345. A counterweight adjustment push rod 347 is installed on the push rod mounting block 346. A mechanical gripper 348 is installed on the movable end of the counterweight adjustment push rod 347. The mechanical gripper 348 has two relatively displaced grippers, and the width of the grippers matches the width of the concave clamping groove 337c.
[0036] The working principle of the suspension reset mechanism 31 is as follows: The slider of the linear guide pair 311 can slide horizontally along the guide rail, driving the outer frame 313 to move horizontally as a whole through the suspension bracket 312, which in turn drives the hammer box 32 and the adjustable load 33 to move horizontally, realizing the switching of the pressure head component 334 in different positions of the anti-torsion arm 101 to meet the pressure resistance testing requirements of different positions. The outer frame 313 provides installation support for components such as the height adjustment screw motor 314 and the height adjustment screw 315. After the height adjustment screw motor 314 is started, it drives the height adjustment screw 315 to rotate. Since the rotation of the movable block 316 is restricted, the movable block 316 will move up and down along the height adjustment screw 315, driving the dual-axis locking push rod 317 and the adjustable load 33 connected to it to move up and down, adjusting the height of the adjustable load 33, and thus adjusting the distance between the pressure head component 334 and the combined fork arm 1, adapting to the testing requirements of different heights, and providing an initial height difference for dynamic load pressure resistance testing. The movable rod of the dual-axis locking push rod 317 can be inserted into the locking groove 331a of the counterweight frame 331 to fix the adjustable load 33 and the movable block 316. When dynamic load testing is required, the movable rod of the dual-axis locking push rod 317 retracts to release the lock. The adjustable load 33 slides down the rectangular slide cavity 322 of the hammer box 32 under its own gravity, and applies pressure to the combined fork arm 1 through the pressure head component 334 to complete the dynamic load compressive strength test. After the test is completed, the movable rod of the dual-axis locking push rod 317 extends to relock the counterweight frame 331. The height adjustment screw motor 314 drives the adjustable load 33 to rise and reset, ready for the next test. The through hole 318 on the lower side plate of the outer frame 313 provides clearance space for the hammer rod 332, ensuring that the hammer rod 332 can move up and down smoothly and avoid interference with the outer frame 313.
[0037] The design concept of Hammer Box 32 is as follows: The hammer box body 321 is installed between the upper and lower side plates of the outer frame 313. The rectangular sliding cavity 322 inside it matches the shape of the counterweight frame 331 of the adjustable load 33, which plays a sliding limit role for the adjustable load 33, ensuring that the adjustable load 33 moves in a straight line during its descent and avoiding deviation that could lead to uneven detection force. The push rod clearance groove 323 provides clearance space for the dual-axis locking push rod 317, preventing interference between the dual-axis locking push rod 317 and the hammer box body 321, ensuring that the dual-axis locking push rod 317 can extend and retract normally, realizing the locking and unlocking of the adjustable load 33. The pressure-bearing lifting block 325 at the bottom of the hammer box body 321 is fixed by bolts 324 to raise the bottom height of the hammer box body 321, so as to avoid interference between the hammer box body 321 and the material loading assembly 2, and at the same time provide sufficient space for the hammer rod 332 and the pressure head assembly 334 to move. The counterweight block inlet and outlet slot 326 is used for the inlet and outlet of the counterweight block 337, so as to facilitate the counterweight adjustment mechanism 34 to add or remove the counterweight block 337 in the counterweight frame 331.
[0038] The design concept of adjustable load 33 is as follows: The counterweight frame 331 provides an installation carrier for the counterweight 337. The loading groove 331b inside is used to place the counterweight 337. The sliding groove 331c cooperates with the protrusion 337a of the counterweight 337 to slide and limit the counterweight 337, ensuring that the counterweight 337 can be smoothly put in or taken out. The top ball plunger 331d is embedded in the sliding groove 331c. Its top end can be inserted into the positioning hole 337b of the protrusion 337a of the counterweight 337 to fix the counterweight 337 in place, preventing the counterweight 337 from shifting during the test and ensuring the stability of the weight of the adjustable load 33. The lower side of the counterweight frame 331 is connected to the roller frame 333 via a hammer rod 332. The hammer rod 332 is used to transmit the gravity of the adjustable load 33, converting the gravity into pressure on the combined fork arm 1. The roller frame 333 is used to support the support roller shaft of the pressure head component 334, allowing the pressure head component 334 to rotate flexibly and adjust the pressure head angle to adapt to the force requirements of different detection positions. The adjusting motor 335 is installed on the outside of the roller frame 333. After starting, its output shaft drives the support roller shaft to rotate through the steering gear set in the gear box 336. The support roller shaft drives the pressure head component 334 to rotate through the keyway on the inner wall of the through-shaft hole 334c, realizing the switching between the concave pressure head 334a and the flat pressure head 334b. The concave pressure head 334a is suitable for pressure testing of the arc surface of the anti-torsion arm 101, while the flat pressure head 334b is suitable for pressure testing of the flat parts of the hinge 102 or the anti-torsion arm 101, improving the adaptability of the test. The counterweight 337 is slidably embedded in the groove 331c of the counterweight frame 331 via the protrusion 337a. The concave clamping grooves 337c on its left and right sides facilitate clamping by the mechanical jaws 348 of the counterweight adjustment mechanism 34, enabling rapid addition and subtraction of the counterweight 337. The positioning hole 337b cooperates with the top ball plunger 331d to ensure the stability of the counterweight 337 after installation.
[0039] The working principle of the counterweight adjustment mechanism 34 is as follows: The tube cover 341 is fitted onto the outside of the counterweight block inlet / outlet slot 326, providing mounting support for components such as the counterweight adjustment motor 343 and the counterweight adjustment screw 344. Its internal extended slide groove 342 corresponds to the slide groove 331c of the counterweight frame 331, ensuring that the counterweight block 337 can move smoothly between the tube cover 341 and the counterweight frame 331. After the counterweight adjustment motor 343 starts, it drives the counterweight adjustment screw 344 to rotate. Since the push rod mounting block 346 is fitted onto the counterweight adjustment guide rod 345 and is guided and limited, the push rod mounting block 346 will move horizontally along the counterweight adjustment screw 344 and the counterweight adjustment guide rod 345, driving the counterweight adjustment push rod 347 and the mechanical gripper 348 to move horizontally, achieving alignment between the mechanical gripper 348 and the counterweight block 337. The counterweight adjustment push rod 347 can drive the mechanical gripper 348 to extend and retract. When it is necessary to add a counterweight 337, the mechanical gripper 348 moves to the position of the counterweight 337, the counterweight adjustment push rod 347 extends, and the two grippers of the mechanical gripper 348 retract to hold the concave clamping groove 337c of the counterweight 337. Then, the counterweight adjustment motor 343 drives the push rod mounting block 346 to move, sending the counterweight 337 through the counterweight inlet / outlet groove 326 into the loading groove 331b of the counterweight frame 331, completing the addition of the counterweight 337. When it is necessary to remove the counterweight 337, the mechanical gripper 348 moves to the corresponding position of the counterweight 337 in the counterweight frame 331, holds the counterweight 337, and removes it from the counterweight frame 331, completing the removal of the counterweight 337.
[0040] This embodiment also provides a method for testing the compressive strength of a landing gear combination fork arm, including the following steps: S1. Load the combined fork arm 1 using the loading assembly 2 and adjust the unfolding angle of the combined fork arm 1 to 180 degrees. Use the hinge support mechanism of the loading assembly 2 to support the hinge 102. Use the compressive strength detection assembly 3 to detect the dynamic load compressive strength at different positions of the two anti-torsion arms 101 in the combined fork arm 1. By detecting the deformation after being subjected to force (using an external high-precision displacement sensor to collect deformation data), determine whether its compressive strength meets the design requirements. Deformation detection points for anti-torsion arm 101: middle part of the anti-torsion arm (area of highest stress concentration); connection between the anti-torsion arm and the hinge ear plate (area of stress concentration); end of the anti-torsion arm near the hinge (area of force transmission).
[0041] S2. Load the combined fork arm 1 using the loading assembly 2, and adjust the unfolding angle of the combined fork arm 1 to 150 degrees, 120 degrees, 90 degrees, 60 degrees and 30 degrees in sequence. Release the hinge support mechanism of the loading assembly 2 from the hinge 102. Use the compressive strength testing assembly 3 to test the dynamic load compressive strength of the hinge 102 at the connection under different unfolding angles. By testing its deformation after being stressed, determine whether its compressive strength meets the design requirements.
[0042] During the testing process, the positioning plug 212 is inserted into the hinge hole of the hinge ear plate 103 at the outer end of the combined fork arm 1 to achieve reliable positioning. With the linkage of the lateral bidirectional displacement mechanism and the longitudinal bidirectional displacement mechanism, the relative distance and placement posture of the upper and lower anti-torsion arms 101 are precisely adjusted. With the action of the height adjustment push rod 213 driving the hinge support block 214 to rise and fall, the combined fork arm 1 can be adjusted to a 180° straight unfolded posture and the hinge 102 can be lifted for pressure resistance testing at different points of a single arm. It can also switch between multiple sets of bending unfolding angles such as 150 degrees, 120 degrees, 90 degrees, 60 degrees, and 30 degrees and remove the hinge support block 214 from supporting the hinge 102 to simulate the stress state under different bending conditions in actual service of the landing gear.
[0043] The suspension reset mechanism 31 drives the suspension frame 312 and the outer frame 313 to slide horizontally as a whole through the linear guide pair 311, realizing the rapid alignment of the pressure head component 334 at the test point of the anti-torsion arm 101; the height adjustment screw motor 314 drives the height adjustment screw 315 to rotate, driving the movable block 316, the double-axis locking push rod 317 and the adjustable dynamic load 33 to rise and fall synchronously, accurately controlling the lifting height of the adjustable dynamic load 33, thereby changing the magnitude of the free fall impact potential energy. The counterweight adjustment mechanism 34 holds the counterweight block 337 through the mechanical gripper 348, and can automatically increase or decrease the number of counterweight blocks 337 in the counterweight load frame 331 through the counterweight block inlet / outlet slot 326; in conjunction with the top ball plunger 331d locking into the positioning hole 337b, the counterweight block 337 is precisely locked in place, and the overall dynamic load is stably controlled. During the downward movement of the adjustable load 33, it slides vertically along the rectangular sliding cavity 322 inside the hammer box body 321 to prevent loading deviation; at the same time, the adjustment motor 335 drives the pressure head component 334 to rotate and switch via the steering gear set inside the gear box 336. The concave pressure head 334a is adapted to detect the pressure on the arc-shaped outer wall of the anti-torsion arm 101, and the flat pressure head 334b is adapted to detect the pressure on the hinge 102 and the flat part of the arm body.
[0044] During testing, the dual-axis locking push rod 317 retracts to unlock the counterweight frame 331, and the adjustable load 33 falls vertically along the hammer box 32 by its own weight. The impact force is transmitted through the hammer rod 332 and the roller frame 333, and the pressure head component 334 applies instantaneous dynamic load pressure to the part of the combined fork arm 1 to be tested. With the help of an external high-precision displacement sensor to collect the deformation data after being compressed, it can be determined whether the compressive strength of the hinge 102 connection under different positions and different unfolding angles of the anti-torsion arm 101 meets the design safety margin.
[0045] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. A compression strength detection system for landing gear combination fork arms, characterized by, include: A loading assembly is used to load a combined fork arm and adjust the unfolding angle of the combined fork arm according to testing requirements. The combined fork arm includes two anti-torsion arms, the inner ends of which are hinged together by a hinge. Each anti-torsion arm has a hinge ear plate at its outer end, and the hinge ear plate has a hinge hole. The loading assembly includes a loading base plate, a lifting push rod, a lateral bidirectional displacement mechanism, a longitudinal bidirectional displacement mechanism, a positioning plug, and a hinge support mechanism. The loading base plate is supported by the lifting push rod on the lateral bidirectional displacement mechanism. Two longitudinal bidirectional displacement mechanisms capable of relative lateral displacement are installed on the lateral bidirectional displacement mechanism. Two positioning plugs capable of relative longitudinal displacement are installed on each longitudinal bidirectional displacement mechanism. The shape of the positioning plug matches the shape of the hinge hole in the hinge ear plate. A hinge support mechanism for supporting the hinge is installed in the middle of the lateral bidirectional displacement mechanism. A compressive strength testing component is used to test the dynamic compressive strength of the two anti-torsion arms at different positions in a combined forklift, as well as the dynamic compressive strength of the hinge at the connection point under different deployment angles. The component includes a suspension reset mechanism, a hammer box, an adjustable dynamic load, and a counterweight adjustment mechanism. The hammer box is supported by the suspension reset mechanism and can move horizontally with it. The adjustable load, which is slidably limited within the hammer box, consists of a counterweight frame, a hammer rod, a roller frame, a pressure head component, and an adjustment motor. The system comprises a gearbox and counterweights. A roller frame is connected to the lower side of the counterweight frame via a hammer rod. A support roller shaft, housing a pressure head component, is movably supported within the roller frame. An adjusting motor is mounted on the outer side of the roller frame. The output shaft of the adjusting motor is connected to the support roller shaft via a steering gear set located in the gearbox. Multiple counterweights are mounted side-by-side in the counterweight frame. The suspension reset mechanism can adjust the height of the adjustable counterweight frame. A counterweight adjustment mechanism is installed on the side of the hammer box to adjust the number of counterweights in the counterweight frame.
2. The compressive strength testing system for a landing gear combination fork arm according to claim 1, characterized in that, The suspension reset mechanism includes a linear guide pair, a suspension frame, an outer frame, a height adjustment screw motor, a height adjustment screw, a movable block, and a dual-axis locking push rod. The slider of the linear guide pair is supported by the outer frame via the suspension frame. The height adjustment screw motor is installed on the upper side plate of the outer frame. The height adjustment screw motor is installed at its output end. A movable block with restricted rotation is sleeved on the outer side of the height adjustment screw. A dual-axis locking push rod is installed on the outer side of the movable block. A through hole for avoiding the hammer rod is provided on the lower side plate of the outer frame.
3. The compressive strength testing system for a landing gear combination fork arm according to claim 2, characterized in that, The hammer box includes a hammer box body installed between the upper and lower side plates of the outer frame. The hammer box body has a rectangular sliding cavity inside. The hammer box body has a push rod clearance groove on the side near the height adjustment screw. The bottom of the hammer box body is bolted with a pressure-bearing lifting block. The upper outer side of the hammer box body has a counterweight block inlet and outlet groove.
4. The compressive strength testing system for a landing gear combination fork arm according to claim 3, characterized in that, The pressure head component consists of an inwardly recessed pressure head and a flat pressure head arranged opposite each other. The pressure head component has a through-shaft hole in the middle to facilitate the passage of the support roller shaft. The inner wall of the through-shaft hole is provided with a keyway.
5. The compressive strength testing system for a landing gear combination fork arm according to claim 4, characterized in that, The counterweight frame is a rectangular frame structure. One side plate of the counterweight frame has a locking groove that cooperates with the movable rod in the dual-axis locking push rod. The counterweight frame has a material loading groove. The upper and lower walls of the material loading groove have multiple sets of sliding grooves symmetrically opened. The counterweight frame is embedded in the sliding groove and a top ball plunger is installed.
6. The compressive strength testing system for a landing gear combination fork arm according to claim 5, characterized in that, The counterweight has symmetrical protrusions on its upper and lower sides that are slidably restricted in the sliding groove. The outer side of the protrusion has a positioning hole that cooperates with the top ball plunger. The left and right sides of the counterweight have concave clamping grooves.
7. The compressive strength testing system for a landing gear combined fork arm according to claim 6, characterized in that, The counterweight adjustment mechanism includes a tube cover sleeved on the outside of the counterweight block inlet / outlet groove. The inner cavity of the tube cover has multiple sets of extended slide grooves symmetrically opened on the upper and lower walls, corresponding to the positions of the slide grooves. A counterweight adjustment motor is installed on the outside of the tube cover. The output end of the counterweight adjustment motor is connected to a counterweight adjustment screw. A counterweight adjustment guide rod is fixed in the tube cover and arranged parallel to the counterweight adjustment screw. A push rod mounting block is sleeved on the outside of the counterweight adjustment screw and the counterweight adjustment guide rod. A counterweight adjustment push rod is installed on the push rod mounting block. A mechanical gripper is installed on the movable end of the counterweight adjustment push rod. The mechanical gripper has two relatively displaced grippers, and the width of the grippers matches the width of the concave clamping groove.
8. A method for testing the compressive strength of a landing gear assembly fork arm, implemented based on the compressive strength testing system for a landing gear assembly fork arm as described in claim 7, characterized in that, Includes the following steps: S1. Load the combined fork arm using the loading assembly, and adjust the unfolding angle of the combined fork arm to 180 degrees. Use the hinge support mechanism of the loading assembly to support the hinge. The dynamic compressive strength of the two anti-torsion arms at different positions in a combined fork arm was tested using a compressive strength testing component. S2. Load the combined fork arm using the loading assembly, and adjust the unfolding angle of the combined fork arm to 150 degrees, 120 degrees, 90 degrees, 60 degrees and 30 degrees in sequence. Release the hinge support mechanism of the loading assembly from supporting the hinge. Use the compressive strength testing assembly to test the dynamic load compressive strength of the hinge at the connection under different unfolding angles.