An angle-adjustable structural water-entry slamming test device

Abstract

The utility model discloses an adjustable angle's structure water entry slamming test device belongs to structure water entry slamming test technical field, and it includes support frame, guide rail, sliding block, bearing, clamp, flexible rope, flexible rope, unhooker, electric hoist, adjustable angle's structure water entry slamming test device, will structure fixed on the clamp, and the clamp is connected through the bearing between the sliding block, and adjustable bearing changes the water entry angle of structure, and is fixed to the bearing through the tapping, makes structure fixed water entry angle, and the sliding block is connected with the guide rail, and the water surface is below the guide rail. The clamp top is connected with electric hoist through unhooker, and the unhooker controls the release of structure, and the release height is changed to provide the initial speed before the structure water entry of adjusting electric hoist, and meanwhile, the clamp is connected with electric hoist through flexible rope to avoid structure to sink after water entry. The device simple structure, easy operation can realize structure different water entry angle's under the slamming test test.

Description

Technical Field

[0001] This utility model belongs to the field of structural water immersion impact testing technology, specifically an adjustable-angle structural water immersion impact testing device. Background Technology

[0002] Slender marine engineering structures, such as underwater submersibles, face strong nonlinear loads upon entry into the water during operation. Slamming is a common problem in many fields, particularly in shipbuilding and marine engineering, and it affects the structural safety performance. Current research on slamming loads, besides theoretical and simulation methods, relies heavily on experimental testing as an accurate and intuitive method. However, water entry tests require appropriate drop-body slamming test devices. Existing devices often rely on drop test stands, which have drawbacks such as: the water entry angle is not adjustable, limiting entry to fixed vertical positions; the adjustment process is complex, hindering rapid repeatability; and interference can easily occur between angle adjustment and sensor placement. Several patents have been published regarding the design of water entry slamming test devices, such as a two-dimensional motion slamming test device (publication number CN106248343B). This device achieves slamming of the structure during horizontal and vertical movement, but it cannot achieve precise control of the water entry angle. For example, a bidirectional high-speed drop impact test device (CN223037346U) can control the structure to enter the water at high speed in both the horizontal and vertical directions, but it cannot adjust the angle of entry into the water. Another example is a six-degree-of-freedom structure entry impact test device (CN115042935A), which controls the initial angle of the structure, but the device is complex, unsuitable for rapid and accurate variable-angle testing, and its initial speed is provided by a motor, resulting in low reliability and upper limit of the release speed. Therefore, there is an urgent need for a simple, easy-to-operate, and rapidly adjustable entry angle water impact test device to meet the research needs of structural safety and load response under specific water entry conditions. Utility Model Content

[0003] In view of the problems existing in the water slamming test device, the purpose of this utility model is to provide an adjustable angle structure water slamming test device, which can quickly adjust the water entry attitude angle of the test model and accurately realize the simulation of water entry at different speeds and angles.

[0004] To achieve the above requirements, the technical solution adopted by this utility model is as follows: An adjustable-angle water immersion impact test device includes: a support frame, a guide rail, a slider, a bearing, a clamp, a release device, and an electric hoist; The support frame is positioned above the test water tank, with guide rails arranged on both sides; The slider is slidably mounted on the guide rail to guide the test model to move vertically. The electric hoist is installed above the support frame and connected to the clamp. A hook is provided below the electric hoist and is connected to the release device. The electric hoist controls the water entry speed of the test model by adjusting the release height of the release device and the clamp. The clamp is connected to the unhooking device and is used to hold the test model; The bearing is positioned between the clamp and the slider to fix the water entry posture of the test model.

[0005] Furthermore, there are two guide rails, which are arranged parallel and symmetrically on both sides of the support frame; there are two sets of sliders, which slide in cooperation with the guide rails on both sides respectively.

[0006] Furthermore, the slider is provided with a groove, the size of which matches the guide rail, so that the guide rail is slidably connected by being embedded in the groove.

[0007] Furthermore, the bearing includes a bearing body capable of circumferential rotation and a locking mechanism for locking the bearing body in position; after adjustment to the target water entry angle, the bearing is locked by operating the locking mechanism to fix the angle.

[0008] Furthermore, the locking mechanism is a threaded component screwed onto the outside of the bearing, and the locking is achieved by generating a radial preload through screwing the threaded component.

[0009] Furthermore, the clamp is connected to the release device via a flexible rope. After the release device is released, the flexible rope is straightened as the test model falls, and its length limits the diving depth of the test model.

[0010] Furthermore, the electric hoist is a remote-controlled electric hoist, used to remotely control the lifting and releasing of the test model.

[0011] Compared with the prior art, this utility model has the following advantages: First, it achieves precise and independent control of the water entry angle and velocity, significantly improving the scientific rigor and data reliability of the experiment. Traditional methods often struggle to accurately control the water entry angle and vertical velocity while ensuring initial posture stability. This invention decouples the angle and height adjustments of the test model through a linkage mechanism of bearings, sliders, and guide rails. Operators can first adjust the fixture and test model steplessly to any target water entry angle by rotating the bearings, and then rigidly fix them using a locking mechanism, ensuring the accuracy of the angle setting and the stability of the posture before water entry. The water entry velocity is achieved by independently adjusting the release height using an electric hoist. After release, the model undergoes near-free fall motion. This independent control mode, with a fixed angle and adjustable speed, can rigorously reproduce various complex water entry conditions, providing a crucial technical foundation for studying the quantitative relationship between water entry impact load and angle and velocity. The accuracy and reliability of the obtained experimental data are significantly improved.

[0012] Secondly, it ensures the extreme stability of the test model's attitude throughout the release and water entry process, effectively avoiding undesirable deflection and vibration. The parallel guide rails and sliders on both sides of the device constitute a high-precision vertical motion constraint system. The test model is rigidly connected to the slider via clamps and bearings, and its degrees of freedom are strictly limited to the vertical direction. During the free fall phase, this guiding mechanism effectively suppresses any horizontal movement, tilting, or yaw that may be caused by initial installation errors, air disturbances, or center of gravity shifts, ensuring that the model smoothly touches the water at the preset entry angle and zero angle of attack. This avoids test errors introduced by attitude instability, ensuring that the only variable in each test is the preset speed or angle.

[0013] Third, it significantly improves testing efficiency, operational convenience, and safety. The device is highly integrated with a simple adjustment process. The electric hoist mechanizes model lifting and releasing, replacing manual handling and release, reducing labor intensity and improving the accuracy and repeatability of height adjustment. The release mechanism enables safe remote release. In particular, the angle adjustment mechanism is simple and intuitive to operate, allowing for quick switching between different working conditions without disassembling the entire device, making large-scale parameter scanning possible and greatly improving efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 These are the front view and side view of this utility model; Figure 3 This is a partial enlarged view of the present invention; Figure 4 This is a structural diagram of the slider, clamp, and bearing of this utility model; Figure 5This is the initial state of the experimental model of this utility model at a certain water entry angle; Figure 6 This is the state of the experimental model of this utility model before entering the water at a certain entry angle.

[0015] Explanation of reference numerals in the attached drawings: 1-Support frame, 2-Electric hoist, 3-Guide rail, 4-Unhooking device, 5-Flexible rope, 6-Clamp, 7-Bearing, 8-Slider, 9-Test model, 10-Test water tank. Detailed Implementation

[0016] The working process of this utility model will be further described below with reference to the accompanying drawings: like Figure 1 The diagram shows the structure of this utility model. The water slamming test device uses aluminum profiles as a support frame. The height of the support frame determines the water slamming speed of the test model. The length and width of the support frame must ensure that the cross-section of the support frame at the water surface meets the size of the test model.

[0017] like Figure 2 The diagram shows the front and side views of this utility model. As an adjustable-angle water slamming test device, it includes a support frame, an electric hoist, a guide rail, a release device, a flexible rope, a clamp, a bearing, a slider, and a test model structure. The support frame is positioned above the test water tank. The guide rail is arranged on both sides of the support frame along its height, and sliders are installed on the guide rails to ensure the stability of the test model after release. The sliders and guide rails ensure that the test model only has vertical movement. The test model slides along the guide rails via the sliders to stabilize its posture until it enters the water. An electric hoist is installed above the support frame. The hook below the electric hoist is connected to the clamp and test model via the release device. Adjusting the electric hoist allows control of the height of the clamp and test model via the release device. After release, the test model undergoes free fall motion close to gravitational acceleration. Therefore, by changing the release height of the clamp and test model, the entry speed of the test model into the water can be further changed, achieving accurate control of the entry speed.

[0018] The release device and clamp are connected by a flexible rope. When the release device is released, the clamp and test model fall freely along the guide rail via a slider until they enter the water. Simultaneously, the clamp and electric hoist are also connected by a flexible rope. One end of the flexible rope is connected to the hook below the electric hoist, and the other end is connected to the connection hole above the clamp. Before the test model is released, the excess portion of the flexible rope can be suspended on one side of the support frame. After the test model is released into the water by the release device, the flexible rope prevents the test model from hitting the bottom. Figure 3 The image shown is a partial enlarged view of the structure of the device of this utility model.

[0019] like Figure 4The diagram shows the structure of the slider, fixture, and bearings. The test model is secured by adjusting the bolts on top of the fixture, and the fixture can be adjusted according to the cross-sectional shape of the test model. The fixture is connected to bearings on both sides, and the bearings are connected to the slider on both sides via bolts. The slider is then connected to the support frame via a guide rail. Under normal conditions, the bearings can rotate freely, meaning the angle between the slider and guide rail and the test model can be freely adjusted, i.e., the water entry angle of the test model can be freely adjusted. Once the target water entry angle is determined, the bearings are rotated to adjust the angle between the slider and guide rail and the test model to the target angle. Then, the outer tap of the bearing is tightened, locking the bearing and preventing further angle adjustment, thus fixing the angle and enabling the test model to undergo a water entry impact test at a specific water entry angle.

[0020] like Figure 5 The figure shows the initial state of the test model at a certain water entry angle. The attitude of the test model is adjusted by the bearing and clamping device. At this time, the release of the unhooking device can complete the release of the test model into the water.

[0021] like Figure 6 The image shows the state of the test model before entering the water at a certain entry angle. After the release of the unhooking device, the test model undergoes free fall motion close to gravitational acceleration until it reaches a vertical velocity... Enter the water and maintain the initial adjusted posture at the entry angle. Water immersion. At this point, the test model has completed the water slam test and is released. The release height is adjusted by an electric hoist to control the water immersion speed, and the water immersion angle is controlled by a bearing and clamping device, so as to realize the reliable and rapid water immersion test of the test model at a specific angle and speed.

[0022] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. An adjustable-angle water immersion impact test device, characterized in that, include: Support frame, guide rail, slider, bearing, clamp, unhooking device and electric hoist; The support frame is positioned above the test water tank, with guide rails arranged on both sides; The slider is slidably mounted on the guide rail to guide the test model to move vertically. The electric hoist is installed above the support frame and connected to the clamp. A hook is provided below the electric hoist and is connected to the release device. The electric hoist controls the water entry speed of the test model by adjusting the release height of the release device and the clamp. The clamp is connected to the unhooking device and is used to hold the test model; The bearing is positioned between the clamp and the slider to fix the water entry posture of the test model.

2. The adjustable-angle water immersion impact test device according to claim 1, characterized in that, The guide rails are two in number, arranged parallel and symmetrically on both sides of the support frame; the sliders are provided in two sets, which slide in cooperation with the guide rails on both sides respectively.

3. The adjustable-angle water immersion impact test device according to claim 2, characterized in that: The slider has a groove whose size matches the guide rail, and the guide rail is inserted into the groove for sliding connection.

4. The adjustable-angle water immersion impact test device according to claim 1, characterized in that: The bearing includes a bearing body capable of circumferential rotation and a locking mechanism for locking the bearing body in position; after adjustment to the target water entry angle, the locking mechanism is operated to lock the bearing in place to fix the angle.

5. The adjustable-angle water immersion impact test device according to claim 4, characterized in that: The locking mechanism is a threaded component that is screwed onto the outside of the bearing. By tightening the threaded component, a radial preload is generated to achieve locking.

6. The adjustable-angle water immersion impact test device according to claim 1, characterized in that: The clamp is connected to the release device via a flexible rope. After the release device is released, the flexible rope is straightened as the test model falls, and its length limits the diving depth of the test model.

7. The adjustable-angle water immersion impact test device according to claim 1, characterized in that: The electric hoist is a remote-controlled electric hoist, used to remotely control the lifting and releasing of the test model.

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