Landing gear drop test bench basket

Abstract

The present invention provides a landing gear drop test bench hanging basket, comprising: a hanging basket frame; multiple groups of guide roller structures arranged at the corners of the hanging basket frame, the guide roller structures including a heading roller structure and a vertical roller structure; wherein the first eccentric shaft rotates to drive the first roller to rotate, so as to steplessly adjust the distance between the wheel surface of the first roller and the test bench column; wherein the vertical roller structure and the heading roller structure adjust the distance between the wheel surface and the test bench column in the same manner. Thus, the roller wheel surface can be infinitely and radially displaced when the eccentric shaft rotates, thereby achieving precise adjustment of the gap between the roller and the test bench column slide. Before the hanging basket is installed, the roller profile can be adjusted to reduce the horizontal size of the hanging basket so that it can quickly pass through the column space for assembly. It can also be accurately calibrated to the ideal gap value before testing, solving the problems of difficult adjustment and heavy workload in the traditional shim adjustment method, and significantly improving the test efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the field of aerospace testing technology, in particular to a landing gear drop shock test bench hanging basket. Background Art

[0002] The landing gear is a critical load-bearing component during takeoff and landing. It is used for taxiing and impact mitigation during takeoff and landing, and withstands significant impact loads during landing, making it the primary load-bearing element of an aircraft. Landing gear design often requires incorporating drop tests to determine landing gear damper parameters and evaluate their performance. Therefore, drop test benches are crucial to landing gear design. Existing landing gear drop tests are primarily conducted on column-type test benches. During a landing gear drop test, a wheel-rotating device is first used to rotate the wheels in reverse and accelerate them to a set taxiing speed. A landing simulator is then dropped vertically from a height along a guide rail to simulate an aircraft landing. This test method simulates the actual motion and stress conditions of the landing gear and wheels during landing. Landing gear drop tests typically use a gondola to simulate the aircraft landing, takeoff weight, and connection to the landing gear. Multiple sets of rollers are typically used between the gondola and the column slide to constrain the gondola in both heading and vertical directions. The gap between the roller and the column slide must be neither too large nor too small, as this will impair the locking system's positioning, leading to a failure of the automatic hook function. Furthermore, the impact force from the wheel hitting the platform could damage the basket. Furthermore, the gap between the roller and the column slide must be neither too small nor too small, as this will reduce the basket's free-fall speed, causing errors in the test system's test power, impacting test accuracy, and potentially leading to test failure. Therefore, the gap between the roller and the slide must be adjustable even after the basket is mounted on the column. Current technology achieves this by adjusting the thickness of the spacers between the roller frame and the basket. However, due to the large number of rollers, adjusting the spacers is difficult and labor-intensive. Furthermore, with the continuous emergence of new aircraft models, the demand for larger drop test benches continues to grow. The problems existing in smaller test benches not only persist on these larger benches, but also introduce new challenges. The weight of the guide rollers and mounting brackets increases exponentially, making it more difficult to adjust the gap between the roller and the slide and installing the roller frame on the basket.

[0003] Therefore, it is necessary to provide a landing gear drop test bench hanging basket to solve the problems existing in the prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a landing gear drop test bench hanging basket, so as to at least solve the problems in the prior art of difficulty in adjusting the gap between the roller and the slide and difficulty in installing the roller frame on the hanging basket.

[0005] To achieve the above-mentioned objectives, the present invention provides a landing gear drop test bench basket, comprising: a basket frame; multiple sets of guide roller structures, the multiple sets of guide roller structures being arranged at the corners of the basket frame, the guide roller structures including a panning roller structure and a vertical roller structure; the panning roller structure comprising: a movable roller seat, a first end of the movable roller seat being connected to the basket frame; a first eccentric shaft, the first eccentric shaft being rotatably arranged at the second end of the movable roller seat; a first end of the first eccentric shaft being located inside the movable roller seat; a first roller, the first roller being tightly fitted onto the outer surface of the first eccentric shaft, the first roller rotating synchronously with the first eccentric shaft; a first adjustment structure, the first adjustment structure being arranged at the outer end of the first eccentric shaft, the first adjustment structure being used to adjust the rotation angle of the first eccentric shaft; wherein the rotation of the first eccentric shaft drives the first roller to rotate, thereby steplessly adjusting the distance between the wheel surface of the first roller and the test bench column; wherein the vertical roller structure and the panning roller structure adjust the distance between the wheel surface and the test bench column in the same manner.

[0006] Optionally, a keyway is provided on the side surface of the second end of the first eccentric shaft, and the first adjustment structure includes: a key, the first end of the key is embedded in the keyway and axially fixed to the side surface of the second end of the first eccentric shaft; an adjusting cover, a keyway hole is provided in the center of the adjusting cover, and the keyway hole cooperates with the second end of the key; the adjusting cover is fixed to the second end of the first eccentric shaft along the circumferential direction; wherein, the adjusting cover is provided with a plurality of blind holes along the circumferential direction, and the blind holes are used to insert a driving lever; external force is transmitted to the adjusting cover, the key, and the first eccentric shaft in sequence through the driving lever, so that the first eccentric shaft rotates around the axis.

[0007] Optionally, a dial is provided on the end surface of the adjusting cover, and the dial is used to display the rotation angle of the adjusting cover.

[0008] Optionally, the first end of the movable roller seat is connected to the hanging basket frame through a movable pin and a fixed pin; wherein, when the movable pin and the fixed pin are both installed at the first end of the movable roller seat, the movable roller seat is fixed; when the fixed pin is not installed, the movable roller seat can be rotated around the movable pin until it is embedded in the hanging basket frame.

[0009] Optionally, the hanging basket frame includes: an upper beam assembly; a lower beam assembly, the lower beam assembly is horizontally arranged below the upper beam assembly in the vertical direction; a reinforcing structure, the reinforcing structure is arranged between the upper beam assembly and the lower beam assembly, and the reinforcing structure is used to connect the upper beam assembly and the lower beam assembly; wherein the upper beam assembly and the lower beam assembly have the same structure.

[0010] Optionally, the upper beam assembly includes: an upper main beam support plate; two groups of upper end roller frames, which are symmetrically arranged on both sides of the upper main beam support plate; a group of guide roller structures is arranged at both ends of each upper end roller frame; wherein the first end of the movable roller seat corresponding to the two ends of each upper end roller frame is connected to the upper end roller frame, and the movable roller seat can be rotated to be embedded in the upper end roller frame.

[0011] Optionally, the lower beam assembly includes: a lower main beam support plate; two groups of lower end roller frames, which are symmetrically arranged on both sides of the lower main beam support plate; a group of guide roller structures is arranged at both ends of each lower end roller frame; wherein the first end of the movable roller seat corresponding to the two ends of each lower end roller frame is connected to the lower end roller frame, and the movable roller seat can be rotated to be embedded in the lower end roller frame.

[0012] Optionally, the reinforcement structure includes: multiple groups of main prestressed tie rod assemblies, multiple groups of the main prestressed tie rod assemblies are symmetrically tensioned and connected between the upper main beam support plate and the lower main beam support plate; multiple groups of auxiliary prestressed tie rod assemblies, multiple groups of the auxiliary prestressed tie rod assemblies are symmetrically tensioned and connected between each group of the upper end roller frames and each group of the lower end roller frames; a locking shaft, the locking shaft is fixedly connected to the geometric center of the upper beam assembly and the lower beam assembly; an auxiliary support plate, the auxiliary support plate is arranged along the heading, the upper surface of the auxiliary support plate is fixedly fitted with the lower surface of the upper main beam support plate by bolts, and the lower surface of the auxiliary support plate is fixedly fitted with the upper surface of the lower main beam support plate by bolts; wherein the main prestressed tie rod assembly has the same structure as the auxiliary prestressed tie rod assembly.

[0013] Optionally, the main prestressed pull rod assembly includes: a main prestressed screw, the bottom end of the main prestressed screw is screwed into the lower main beam support plate; the second end of the main prestressed screw passes through the upper main beam support plate; a round nut, the round nut is screwed into the second end of the main prestressed screw, and the round nut is used to lock the main prestressed screw between the upper main beam support plate and the lower main beam support plate; a prestressed screw spacer, the prestressed screw spacer is tightly sleeved on the outside of the main prestressed screw, the upper end of the prestressed screw spacer is matched with the upper main beam support plate through a step positioning structure, and the lower end of the prestressed screw spacer is matched with the lower main beam support plate through a step positioning structure.

[0014] Optionally, the reinforcement structure further includes: a plurality of locking screws, the plurality of locking screws are symmetrically distributed in two rows along the heading direction, and the upper and lower ends of each locking screw are respectively connected to the upper main beam support plate and the lower main beam support plate.

[0015] 18. The folding roller system of claim 17, wherein the guide rollers are arranged at the corners of the folding roller system, the guide rollers comprising a panning roller structure and a vertical roller structure; the panning roller structure comprising a movable roller seat, the first end of the movable roller seat being connected to the folding roller system; a first eccentric shaft, the first eccentric shaft being rotatably arranged at the second end of the movable roller seat; the first end of the first eccentric shaft being located inside the movable roller seat; a first roller, the first roller being tightly fitted on the outer surface of the first eccentric shaft, the first roller rotating synchronously with the first eccentric shaft; a first adjustment structure, the first adjustment structure being arranged at the outer end of the first eccentric shaft, the first adjustment structure being used to adjust the rotation angle of the first eccentric shaft; wherein the rotation of the first eccentric shaft drives the first roller to rotate, so as to steplessly adjust the distance between the wheel surface of the first roller and the test bench column; wherein the vertical roller structure and the panning roller structure adjust the distance between the wheel surface and the test bench column in the same manner. Therefore, by arranging a heading roller structure and a vertical roller structure containing an eccentric shaft at the corners of the hanging basket frame, and utilizing the stepless adjustable radial displacement of the roller surface when the eccentric shaft rotates, accurate dynamic adjustment of the gap between the roller and the test bench column slide is achieved. Before the hanging basket is installed, the lateral size of the hanging basket can be reduced by adjusting the roller profile to facilitate rapid assembly through the column space. It can also be accurately calibrated to the ideal gap value before the test, solving the problems of the traditional gasket adjustment method, which is difficult to adjust and has a large workload, and the problem that the adjustment of large test benches is more difficult due to the increased weight of the roller, and significantly improving the test efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a three-dimensional schematic diagram of a landing gear drop test bench hanging basket that can be selected according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a main view of a landing gear drop test bench hanging basket according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic top view of a landing gear drop test bench basket according to an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 BB cross-section diagram in;

[0021] Figure 5 yes Figure 3 AA cross-section diagram in;

[0022] Figure 6 Schematic diagram of an optional main prestressed tie rod assembly according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] 10. Hanging basket; 11. Upper beam assembly; 111. Upper main beam support plate; 112. Upper end roller frame; 12. Lower beam assembly; 121. Lower main beam support plate; 122. Lower end roller frame; 13. Reinforcement structure; 131. Main prestressed tie rod assembly; 1311. Main prestressed screw; 1312. Round nut; 1313. Prestressed screw spacer; 132. Auxiliary prestressed tie rod assembly; 1321. Auxiliary prestressed screw; 1322. Auxiliary round nut; 1323. Auxiliary prestressed screw spacer; 13 3. Locking shaft; 134. Auxiliary support plate; 135. Locking screw; 20. Guide roller structure; 21. Heading roller structure; 211. Movable roller seat; 212. Movable pin; 213. Fixed pin; 214. First eccentric shaft; 215. First roller; 216. First adjustment structure; 2161. Key; 2162. Adjustment cover; 2163. Dial; 217. Copper sleeve; 218. First cover; 219. Second cover; 220. Third cover; 22. Vertical roller structure. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, a drop shock test bench hanging basket includes: a hanging basket frame 10; multiple groups of guide roller structures 20, multiple groups of guide roller structures 20 are arranged at the corners of the hanging basket frame 10, the guide roller structure 20 includes a navigation roller structure 21 and a vertical roller structure 22; the navigation roller structure 21 includes: a movable roller seat 211, the first end of the movable roller seat 211 is connected to the hanging basket frame 10; a first eccentric shaft 214, the first eccentric shaft 214 is rotatably arranged at the second end of the movable roller seat 211; the first end of the first eccentric shaft 214 is located inside the movable roller seat 211; a first roller 215, the first roller The wheel 215 is tightly fitted on the outer surface of the first eccentric shaft 214, and the first roller 215 rotates synchronously with the first eccentric shaft 214; the first adjustment structure 216, the first adjustment structure 216 is arranged at the outer end of the first eccentric shaft 214, and the first adjustment structure 216 is used to adjust the rotation angle of the first eccentric shaft 214; wherein, the rotation of the first eccentric shaft 214 drives the first roller 215 to rotate, so as to steplessly adjust the distance between the wheel surface of the first roller 215 and the test bench column; wherein, the vertical roller structure 22 and the heading roller structure 21 adjust the distance between the wheel surface and the test bench column in the same way.

[0027] Specifically, the drop shock test bench basket in this application is mainly composed of a basket frame 10 and multiple sets of guide roller structures 20. The multiple sets of guide roller structures 20 are respectively installed at the corners of the basket frame 10, and are used to limit the heading of the basket, i.e., the wheel running direction, parallel to the runway direction, and vertically, i.e., the horizontal movement perpendicular to the heading, during the test process, to ensure that the basket moves stably along a preset trajectory when falling, and to simulate the stress state during a real landing. Among them, the core support structure of the column test bench is composed of four columns, which are usually distributed in a rectangular shape, corresponding to the four main load-bearing points of the aircraft landing gear, and the surface of the columns is installed with guide slides. The drop shock test bench basket of this solution is equipped with a set of guide roller structures 20 at each corner of the basket frame 10, including the upper and lower ends of the vertical frame and the left and right ends of the horizontal frame. Each set of guide roller structures 20 cooperates with the nearest column separately to jointly constrain the movement of the basket in the heading and vertical direction.

[0028] The guide roller structure 20 includes a heading roller structure 21 and a vertical roller structure 22. The heading roller structure 21 is installed at the corners of the basket frame 10 and is primarily used to limit the basket's displacement in the heading direction, preventing the basket from lateral deviation due to heading impact forces during the descent. It also needs to accommodate the heading impact load generated when the wheels contact the platform, preventing test data distortion caused by the basket's shaking. The vertical roller structure 22 is also installed at the corners of the basket frame 10 to limit the basket's displacement in the horizontal direction perpendicular to the heading direction, ensuring that the basket falls vertically along the guide rails of the column test bench, i.e., the columns, and preventing vertical shaking from affecting the accuracy of the buffer performance test.

[0029] The navigation roller structure 21 allows for stepless adjustment of the distance between the first roller 215 and the test bench column slide. The first eccentric shaft 214 is rotatably mounted on the second end of the movable roller seat 211, with its first end located within the movable roller seat 211 and its second end exposed and connected to the first adjustment structure 216. The first roller 215 fits tightly onto the outer surface of the first eccentric shaft 214, achieving synchronous rotation through an interference fit. The rotation axis of the first eccentric shaft 214 does not coincide with the geometric centerline; a fixed eccentric distance exists between them. When the first eccentric shaft 214 rotates about its rotation axis, the eccentric distance causes the first roller 215, mounted on its outer surface, to displace perpendicular to the rotation axis. For example, when the first eccentric shaft 214 rotates clockwise, the wheel surface of the first roller 215 gradually moves outward, increasing the distance from the column slide. When the first eccentric shaft 214 rotates counterclockwise, the wheel surface retracts, decreasing the distance. This displacement is proportional to the rotation angle of the first eccentric shaft, and since the eccentricity is fixed, the rotation angle and the displacement are linearly related, thereby achieving continuous and precise adjustment of the wheel surface position of the first roller 215, that is, stepless adjustment.

[0030] The first adjustment structure 216 is mounted on the outer end of the first eccentric shaft 214 and is driven manually or electrically to rotate the first eccentric shaft 214. Due to the eccentricity of the first eccentric shaft 214, when the first adjustment structure 216 drives the first eccentric shaft 214 to rotate, the wheel surface of the first roller 215 moves toward or away from the column slide, thereby achieving stepless adjustment of the distance between the wheel surface of the first roller 215 and the column slide.

[0031] The vertical roller structure 22 is directly mounted on the hanging basket frame 10 and includes a second eccentric shaft, which is rotatably mounted on the hanging basket frame 10. A second roller is tightly fitted onto the outer surface of the second eccentric shaft, rotating synchronously with the second eccentric shaft. A second adjustment structure is provided at the outer end of the second eccentric shaft to adjust the rotation angle of the second eccentric shaft. The vertical roller structure 22's stepless adjustment of the second roller and the column slide is similar to that of the panning roller structure 21.

[0032] The two ends of the first eccentric shaft 214 are restrained on the movable roller seat 211 by the second pressure cover 219. After the second pressure cover 219 is removed, the first eccentric shaft 214 can be removed from the movable roller seat 211. The two ends of the second eccentric shaft are restrained on the hanging basket frame 10 by the third pressure cover 220. After the third pressure cover 220 is removed, the second eccentric shaft can be removed from the hanging basket frame 10.

[0033] Furthermore, the eccentricity of the first and second eccentric shafts 214 is 2-5 mm, allowing the rollers to produce a 2-5 mm radial displacement during rotation. This directly results in the outer contour of the rollers, which are fixed to the eccentric shafts, being able to contract inward or expand outward toward the basket frame. When the basket is placed between the columns, the eccentric shafts are rotated to cause the outer contour of the rollers to contract inward toward the basket frame. This reduces the overall edge dimensions of the basket, particularly the lateral width of the area in contact with the columns, making it easier to fit through the space between the columns and install.

[0034] In a possible embodiment, a keyway is provided on the side surface of the second end of the first eccentric shaft 214, and the first adjustment structure 216 includes:

[0035] A key 2161, a first end of the key 2161 is embedded in the keyway and axially fixed to the side surface of the second end of the first eccentric shaft 214;

[0036] The adjusting cover 2162 has a key slot at its center, which engages with the second end of the key 2161 . The adjusting cover 2162 is fixed to the second end of the first eccentric shaft 214 along the circumferential direction.

[0037] Among them, the adjustment cover 2162 is provided with multiple blind holes along the circumference, and the blind holes are used to insert the driving lever; the external force is transmitted to the adjustment cover 2162, the key 2161, and the first eccentric shaft 214 in sequence through the driving lever, causing the first eccentric shaft 214 to rotate around the axis.

[0038] Specifically, a keyway is defined on the side of the second end of the first eccentric shaft 214. The first end of the key 2161 is inserted into the keyway and axially secured with a screw, forming a rigid connection with the first eccentric shaft 214. When the first eccentric shaft 214 rotates, the key 2161 rotates synchronously with it, directly transmitting the rotational power to subsequent components, ensuring the continuity and stability of power transmission.

[0039] The center of the adjustment cover 2162 is provided with a keyway hole that cooperates with the second end of the key 2161. The adjustment cover 2162 is fixed to the second end of the first eccentric shaft 214 by bolts. The adjustment cover 2162 has multiple blind holes evenly distributed along the circumference for inserting the driving lever.

[0040] External force drives the adjustment cover 2162 to rotate via the driving lever, which in turn drives the first eccentric shaft 214 to rotate via the key 2161. Because the geometric center of the first eccentric shaft 214 is offset from its rotational center, its rotation directly changes the position of the first roller 215, enabling continuous and precise adjustment of the distance from the column slide, thus avoiding the poor precision of conventional discrete gear adjustment.

[0041] The structure of the outer end portion of the second eccentric shaft of the vertical roller structure 22 is the same as the structure of the first eccentric shaft 214 of the pan roller structure 21 .

[0042] In a possible implementation, a dial 2163 is provided on the end surface of the adjustment cover 2162 , and the dial 2163 is used to display the rotation angle of the adjustment cover 2162 .

[0043] Specifically, a scale plate 2163 is provided on the end surface of the adjustment cover 2162. The scale plate 2163 is coaxially fixed to the adjustment cover 2162 and has angle scale markings on its edge. When the adjustment cover 2162 is rotated by a lever driven by an external force, the scale plate 2163 rotates accordingly. The operator can read the rotation angle of the adjustment cover 2162 in real time by observing the relative position of the pointer and the scale markings on the scale plate 2163. Based on the rotation angle of the adjustment cover 2162, the operator can determine the specific amount by which the first roller 215 has deviated from its initial position. This enables stepless, visual adjustment of the roller position, improving the accuracy and efficiency of gap adjustment.

[0044] In a possible embodiment, the first end of the movable roller seat 211 is connected to the hanging basket frame 10 through a movable pin 212 and a fixed pin 213;

[0045] Among them, when the movable pin 212 and the fixed pin 213 are both installed on the first end of the movable roller seat 211, the movable roller seat 211 is fixed; when the fixed pin 213 is not installed, the movable roller seat 211 can rotate around the movable pin 212 to be embedded in the hanging basket frame 10.

[0046] Specifically, the first end of the movable roller seat 211 is connected to the hanging basket frame 10 through a movable pin 212 and a fixed pin 213. The installation state of the fixed pin 213 determines the stability of the movable roller seat 211. When the fixed pin 213 is installed in place, the movable roller seat 211 is completely fixed and cannot rotate; when the fixed pin 213 is not installed, the movable roller seat 211 is only connected through the movable pin 212 and can rotate around the movable pin 212, thereby achieving the action of folding or unfolding. Among them, the movable pin 212 and the fixed pin 213 are both installed in the pin hole of the copper sleeve 217, and the copper sleeve 217 is installed in the hanging basket frame 10. The top cover of the movable pin 212 and the fixed pin 213 is larger than the pin hole on the copper sleeve 217. A first pressure cover 218 is set at the bottom end of the movable pin 212 and the fixed pin 213. The size of the first pressure cover 218 is larger than the size of the pin hole of the copper sleeve 217. Each first pressure cover 218 is fixed to the bottom end of the movable pin 212 and the fixed pin 213 by a corresponding screw, thereby fixing the movable roller seat 211 on the hanging basket frame 10 through the movable pin 212 and the fixed pin 213.

[0047] Before the hanging basket frame 10 is placed between the columns of the column test bench, the heading roller structure 21 is in a retracted state to reduce the overall lateral size of the hanging basket frame 10 and facilitate the hanging basket to be smoothly placed in the limited space between the columns along the heading.

[0048] After the hanging basket is placed between the columns, when the test is to be carried out, the heading roller structure 21 is extended and corresponds to the slide of the corresponding column, and then the gap between the heading roller structure 21 and the vertical roller structure 22 and the corresponding column is adjusted to ensure that the hanging basket moves stably along the preset trajectory during the test.

[0049] In one possible embodiment, the hanging basket frame 10 includes:

[0050] Upper beam assembly 11;

[0051] The lower beam assembly 12 is horizontally arranged below the upper beam assembly 11 in the vertical direction;

[0052] A reinforcement structure 13 is provided between the upper beam assembly 11 and the lower beam assembly 12 and is used to connect the upper beam assembly 11 and the lower beam assembly 12;

[0053] The upper beam assembly 11 and the lower beam assembly 12 have the same structure.

[0054] Specifically, the upper beam assembly 11 is the top load-bearing structure of the hanging basket frame 10, which is made of high-strength metal profiles and is used to bear the top load of the hanging basket, such as the weight of the hanging basket and the impact force of the drop shock. The lower beam assembly 12 is arranged in parallel with the upper beam assembly 11, located at the bottom of the hanging basket frame 10, and assumes a mechanical function symmetrical to the upper beam assembly 11. Its structure is exactly the same as that of the upper beam assembly 11, and is also made of high-strength profiles. The lower beam assembly 12 provides bottom support for the hanging basket, and at the same time, through coordination with the upper beam assembly 11, a stable frame structure is formed to jointly resist the dynamic impact load in the drop shock test. The reinforcement structure 13 is a supporting component connecting the upper beam assembly 11 and the lower beam assembly 12, which improves the overall rigidity of the hanging basket.

[0055] The upper beam assembly 11 and the lower beam assembly 12 have exactly the same structure. The symmetry improves the overall balance and stability of the hanging basket frame, makes the load transfer path more balanced, and reduces the local stress concentration problem caused by structural asymmetry.

[0056] In one possible implementation, the upper beam assembly 11 includes:

[0057] Upper main beam support plate 111;

[0058] Two sets of upper end roller frames 112 are symmetrically arranged on both sides of the upper main beam support plate 111; a set of guide roller structures 20 are respectively arranged at both ends of each upper end roller frame 112;

[0059] The first ends of the movable roller seats 211 correspondingly provided at both ends of each upper roller frame 112 are connected to the upper roller frame 112 , and the movable roller seats 211 can be rotated to be embedded in the upper roller frame 112 .

[0060] Specifically, two sets of upper end roller frames 112 are symmetrically welded to both sides of the upper main beam support plate 111. A set of guide roller structures 20 are installed at both ends of each set of upper end roller frames 112 to ensure that the four corners of the hanging basket upper beam assembly 11 have heading and vertical limit capabilities.

[0061] The guide roller structures 20 at both ends of each upper end roller frame 112 are connected through a movable roller seat 211. The first end thereof adopts a rotatable design and can be rotated 90° around the connection point to be embedded in the internal space of the upper end roller frame 112, so that the hanging basket can be smoothly placed between the columns of the test bench along the heading.

[0062] In one possible embodiment, the lower beam assembly 12 includes:

[0063] Lower main beam support plate 121;

[0064] Two sets of lower end roller frames 122 are symmetrically arranged on both sides of the lower main beam support plate 121; a set of guide roller structures 20 are respectively arranged at both ends of each lower end roller frame 122;

[0065] The first ends of the movable roller seats 211 correspondingly provided at both ends of each lower end roller frame 122 are connected to the lower end roller frame 122 , and the movable roller seats 211 can be rotated to be embedded in the lower end roller frame 122 .

[0066] Specifically, the lower beam assembly 12 is composed of a lower main beam support plate 121 and two groups of symmetrically distributed lower end roller frames 122, and its structure is exactly the same as that of the upper beam assembly 11; a group of guide roller structures 20 are installed at both ends of each group of lower end roller frames 122, and the movable roller seat 211 is rotatable, so that the movable roller seat 211 can be retracted into the lower end roller frame 122, thereby reducing the lateral size of the hanging basket, making it easier to place the hanging basket between the columns during the experiment. After the hanging basket is placed in the columns, the rollers are unfolded to achieve heading and vertical limit constraints, and cooperate with the upper beam assembly to form a stable force-bearing frame.

[0067] In one possible implementation, the reinforcement structure 13 includes:

[0068] Multiple groups of main prestressed tie rod assemblies 131, the multiple groups of main prestressed tie rod assemblies 131 are symmetrically tensioned and connected between the upper main beam support plate 111 and the lower main beam support plate 121;

[0069] Multiple groups of auxiliary prestressed tie rod assemblies 132, the multiple groups of auxiliary prestressed tie rod assemblies 132 are symmetrically tensioned and connected between each group of upper end roller frames 112 and each group of lower end roller frames 122;

[0070] A locking shaft 133 , the locking shaft 133 is fixedly connected to the geometric center of the upper beam assembly 11 and the lower beam assembly 12 ;

[0071] Auxiliary support plate 134, the auxiliary support plate 134 is arranged along the heading direction, the upper surface of the auxiliary support plate 134 is fixedly fitted with the lower surface of the upper main beam support plate 111 by bolts, and the lower surface of the auxiliary support plate 134 is fixedly fitted with the upper surface of the lower main beam support plate 121 by bolts;

[0072] The main prestressed tie rod assembly 131 and the auxiliary prestressed tie rod assembly 132 have the same structure.

[0073] Specifically, the main prestressed tie rod assembly 131 is symmetrically arranged between the upper main beam support plate 111 and the lower main beam support plate 121. The auxiliary prestressed tie rod assembly 132 symmetrically connects the upper and lower roller frames 112 and 122. This preload offsets the dynamic impact loads experienced by the hanging basket during the drop test, significantly improving overall rigidity and deformation resistance. The locking shaft 133 is fixed to the geometric center of the upper and lower beam assemblies, further enhancing vertical stability. The auxiliary support plate 134 is aligned with the upper and lower main beam support plates 111 and 121 along the course, and bolted together to distribute concentrated stress and prevent localized deformation.

[0074] The main prestressed tie rod assembly 131 and the auxiliary prestressed tie rod assembly 132 adopt the same structural design. The main prestressed tie rod assembly 131 mainly suppresses the vertical relative displacement between the upper and lower beam assemblies to prevent the overall collapse or twisting of the hanging basket; the auxiliary prestressed tie rod assembly 132 constrains the lateral swing of the upper end roller frame 112 and the lower end roller frame 122. The synergistic effect effectively disperses the impact energy, evenly transfers the load to each supporting component, reduces local stress concentration, and improves the reliability of the hanging basket in a high-frequency vibration environment.

[0075] In one possible implementation, the main prestressed tie rod assembly 131 includes:

[0076] A main prestressed screw 1311, the bottom end of which is screwed into the lower main beam support plate 121; the second end of which passes through the upper main beam support plate 111;

[0077] A round nut 1312 is screwed onto the second end of the main prestressed screw 1311. The round nut 1312 is used to lock the main prestressed screw 1311 between the upper main beam support plate 111 and the lower main beam support plate 121.

[0078] Prestressed screw spacer 1313, the prestressed screw spacer 1313 is tightly fitted on the outside of the main prestressed screw 1311, the upper end of the prestressed screw spacer 1313 is matched with the upper main beam support plate 111 through a stepped positioning structure, and the lower end of the prestressed screw spacer 1313 is matched with the lower main beam support plate 121 through a stepped positioning structure.

[0079] Specifically, the bottom end of the main prestressed screw 1311 is screwed into the threaded hole of the lower main beam support plate 121, and the upper end is locked by the round nut 1312 after passing through the through hole of the upper main beam support plate 111. By rotating the round nut 1312, the main prestressed screw 1311 is applied with axial preload force, so that the lower beam assembly 12 and the upper beam assembly 11 are tightly pressed together to resist the test impact; the outer wall of the prestressed screw spacer 1313 and the inner wall of the through hole of the upper main beam support plate 111 and the lower main beam support plate 121 adopt a stepped positioning fit, that is, the upper and lower ends of the spacer are respectively provided with annular steps matching the edge of the through hole of the support plate, the step surface of the upper end of the prestressed screw spacer 1313 is in contact with the bottom surface of the upper main beam support plate 111, and the step surface of the lower end is in contact with the top surface of the lower main beam support plate 121, which not only limits the radial displacement of the main prestressed screw 1311 to avoid loose connection, but also evenly disperses the preload force through the stepped surface to prevent local stress concentration.

[0080] The auxiliary prestressed tie rod assembly 132 includes an auxiliary prestressed screw 1321, an auxiliary round nut 1322, and an auxiliary prestressed screw spacer 1323. The bottom end of the auxiliary prestressed screw 1321 is threaded onto the lower roller frame 122, and the second end of the auxiliary prestressed screw 1321 extends through the upper roller frame 112. The auxiliary round nut 1322 is threaded onto the second end of the auxiliary prestressed screw 1321 and is used to lock the auxiliary prestressed screw 1321 between the upper roller frame 112 and the upper roller frame 112. The auxiliary prestressed screw spacer 1323 is tightly fitted onto the exterior of the auxiliary prestressed screw 1321. The upper end of the auxiliary prestressed screw spacer 1323 engages with the upper main beam support plate 111 via a stepped positioning structure, and the lower end of the auxiliary prestressed screw spacer 1323 engages with the lower main beam support plate 121 via a stepped positioning structure.

[0081] In a possible implementation, the reinforcement structure 13 further includes:

[0082] A plurality of locking screws 135 are symmetrically distributed in two rows along the heading direction, and the upper and lower ends of each locking screw 135 are respectively connected to the upper main beam support plate 111 and the lower main beam support plate 121.

[0083] Specifically, a nut is provided on the upper and lower sides of the upper main beam support plate 111 at the upper end of each locking screw 135. After the lower nut is tightened, it directly presses the top surface of the upper main beam support plate 111. The upper nut and the lower nut are locked against each other, and the two together form an anti-loosening structure - in the high-frequency vibration environment of the drop shock test, even if a single nut undergoes a slight displacement due to the impact, the upper and lower nuts against each other can maintain the stability of the screw connection through mutual restraint, effectively avoiding the loosening of the connection part and causing the lateral constraint of the hanging basket frame to fail, thereby improving the vibration stability and safety reliability of the overall structure.

[0084] When in use, first assemble the upper beam assembly 11, the lower beam assembly 12, the main prestressed tie rod assembly 131, the auxiliary prestressed tie rod assembly 132, the heading roller structure 21, the vertical roller structure 22 and other structures according to Figure 1 The initial state is as follows: Figure 3 As shown, at this time, the heading roller structure 21 is in the unfolded state, and the hanging basket cannot be installed as a whole into the column of the drop shock test bench.

[0085] Next, follow Figure 5 As shown in FIG, first remove the first pressure cover 218 at the bottom of all movable pins 212, and then the movable pins 212 can be pulled out from the movable roller seat 211.

[0086] When the above steps are completed, the movable roller seat 211 can rotate as a whole around the fixed pin shaft 213, and the rotation direction is away from the vertical roller structure 22, ensuring that all the heading roller structures 21 are completely retracted into the hanging basket frame 10.

[0087] Check the dial 2163 of the heading roller structure 21 to ensure that the position of the first eccentric shaft 214 is at the position that makes the outer contour of the first roller 215 at the minimum value. At this time, the outer contour dimensions of all the first rollers 215 in the hanging basket are smaller than the distance between the test bench column slides, and the hanging basket can be pushed between the columns along the heading.

[0088] When the hanging basket is completely inserted between the test bench columns, all the course roller structures 21 are rotated around the fixed pin 213, and the first roller 215 is flush with the column slide, and then the movable pin 212 is inserted to lock the course roller structure 21.

[0089] Adjust the eccentric shafts of each pan roller structure 21 and vertical roller structure 22 to ensure that the gap between the wheel surface of each roller and the test bench slide reaches the set value, which is recommended to be 0.3-0.4mm.

[0090] When the hanging basket needs to be removed from the column of the drop shock test bench, first pull out the movable pin 212 and retract all the heading roller structures 21 into the hanging basket frame 10. Next, adjust the gap between the wheel surface of the second roller of the vertical roller structure 22 and the test bench column slide to the maximum, and the hanging basket can be withdrawn as a whole along the heading.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hanging basket for a drop shock test bench, characterized in that: include: Hanging basket frame (10); Multiple groups of guide roller structures (20), the multiple groups of guide roller structures (20) are arranged at the corners of the hanging basket frame (10), and the guide roller structures (20) include a heading roller structure (21) and a vertical roller structure (22); The heading roller structure (21) comprises: A movable roller seat (211), wherein a first end of the movable roller seat (211) is connected to the hanging basket frame (10); a first eccentric shaft (214), the first eccentric shaft (214) being rotatably disposed at the second end of the movable roller seat (211); the first end of the first eccentric shaft (214) being located inside the movable roller seat (211); a first roller (215), wherein the first roller (215) is tightly fitted onto the outer surface of the first eccentric shaft (214), and the first roller (215) rotates synchronously with the first eccentric shaft (214); a first adjustment structure (216), the first adjustment structure (216) being arranged at an outer end portion of the first eccentric shaft (214), the first adjustment structure (216) being used to adjust a rotation angle of the first eccentric shaft (214); The first eccentric shaft (214) rotates to drive the first roller (215) to rotate, so as to steplessly adjust the distance between the wheel surface of the first roller (215) and the test bench column; The vertical roller structure (22) and the heading roller structure (21) are used in the same manner to adjust the distance between the wheel surface and the test bench column.

2. The hanging basket of the drop test bench according to claim 1, characterized in that: A keyway is provided on the side surface of the second end of the first eccentric shaft (214), and the first adjustment structure (216) comprises: a key (2161), wherein a first end of the key (2161) is embedded in the keyway and axially fixed to a side surface of a second end of the first eccentric shaft (214); An adjusting cover (2162), wherein a key slot hole is provided at the center of the adjusting cover (2162), and the key slot hole cooperates with the second end of the key (2161); the adjusting cover (2162) is fixed to the second end of the first eccentric shaft (214) along the circumferential direction; The adjusting cover (2162) is provided with a plurality of blind holes along the circumferential direction, and the blind holes are used to insert a driving lever; the external force is sequentially transmitted to the adjusting cover (2162), the key (2161), and the first eccentric shaft (214) through the driving lever, so that the first eccentric shaft (214) rotates around the axis.

3. The hanging basket of the drop test bench according to claim 2, characterized in that: The end surface of the adjusting cover (2162) is provided with a dial (2163), and the dial (2163) is used to display the rotation angle of the adjusting cover (2162).

4. The hanging basket of the drop test bench according to claim 1, characterized in that: The first end of the movable roller seat (211) is connected to the hanging basket frame (10) via a movable pin (212) and a fixed pin (213); When the movable pin (212) and the fixed pin (213) are both installed at the first end of the movable roller seat (211), the movable roller seat (211) is fixed; when the fixed pin (213) is not installed, the movable roller seat (211) can rotate around the movable pin (212) until it is embedded in the hanging basket frame (10).

5. The hanging basket of the drop test bench according to claim 1, characterized in that: The hanging basket frame (10) comprises: Upper beam assembly (11); a lower beam assembly (12), the lower beam assembly (12) being arranged horizontally below the upper beam assembly (11) in a vertical direction; a reinforcing structure (13), the reinforcing structure (13) being arranged between the upper beam assembly (11) and the lower beam assembly (12), the reinforcing structure (13) being used to connect the upper beam assembly (11) and the lower beam assembly (12); Wherein, the upper beam assembly (11) and the lower beam assembly (12) have the same structure.

6. The hanging basket of the drop test bench according to claim 5, characterized in that: The upper beam assembly (11) comprises: Upper main beam support plate (111); Two groups of upper end roller frames (112), the two groups of upper end roller frames (112) being symmetrically arranged on both sides of the upper main beam support plate (111); a group of guide roller structures (20) is respectively arranged at both ends of each upper end roller frame (112); The first end of the movable roller seat (211) correspondingly arranged at both ends of each upper end roller frame (112) is connected to the upper end roller frame (112), and the movable roller seat (211) can be rotated to be embedded in the upper end roller frame (112).

7. The hanging basket of the drop test bench according to claim 6, characterized in that: The lower beam assembly (12) comprises: Lower main beam support plate (121); Two groups of lower end roller frames (122), the two groups of lower end roller frames (122) being symmetrically arranged on both sides of the lower main beam support plate (121); a group of guide roller structures (20) is respectively arranged at both ends of each lower end roller frame (122); The first end of the movable roller seat (211) correspondingly arranged at both ends of each lower end roller frame (122) is connected to the lower end roller frame (122), and the movable roller seat (211) can be rotated to be embedded in the lower end roller frame (122).

8. The hanging basket of the drop test bench according to claim 7, characterized in that: The reinforcement structure (13) comprises: A plurality of groups of main prestressed tie rod assemblies (131), wherein the plurality of groups of main prestressed tie rod assemblies (131) are symmetrically tensioned and connected between the upper main beam support plate (111) and the lower main beam support plate (121); Multiple groups of auxiliary prestressed pull rod assemblies (132), wherein the multiple groups of auxiliary prestressed pull rod assemblies (132) are symmetrically tensioned and connected between each group of the upper end roller frame (112) and each group of the lower end roller frame (122); A locking shaft (133), the locking shaft (133) being fixedly connected to the geometric centers of the upper beam assembly (11) and the lower beam assembly (12); An auxiliary support plate (134), the auxiliary support plate (134) being arranged along the heading direction, the upper surface of the auxiliary support plate (134) being fixedly fitted to the lower surface of the upper main beam support plate (111) by means of bolts, and the lower surface of the auxiliary support plate (134) being fixedly fitted to the upper surface of the lower main beam support plate (121) by means of bolts; The main prestressed pull rod assembly (131) and the auxiliary prestressed pull rod assembly (132) have the same structure.

9. The hanging basket of the drop test bench according to claim 8, characterized in that: The main prestressed tie rod assembly (131) comprises: a main prestressed screw rod (1311), wherein the bottom end of the main prestressed screw rod (1311) is screwed into the lower main beam support plate (121); and the second end of the main prestressed screw rod (1311) passes through the upper main beam support plate (111); a round nut (1312), the round nut (1312) being screwed onto the second end of the main prestressed screw rod (1311), the round nut (1312) being used to lock the main prestressed screw rod (1311) between the upper main beam support plate (111) and the lower main beam support plate (121); A prestressed screw spacer (1313), wherein the prestressed screw spacer (1313) is tightly sleeved on the outside of the main prestressed screw (1311), the upper end of the prestressed screw spacer (1313) is matched with the upper main beam support plate (111) through a stepped positioning structure, and the lower end of the prestressed screw spacer (1313) is matched with the lower main beam support plate (121) through a stepped positioning structure.

10. The hanging basket of the drop test bench according to claim 8, characterized in that: The reinforcement structure (13) further comprises: A plurality of locking screws (135) are symmetrically distributed in two rows along the heading direction, and the upper and lower ends of each locking screw (135) are respectively connected to the upper main beam support plate (111) and the lower main beam support plate (121).

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