Bidirectional high-speed falling body slamming test device

Abstract

The utility model belongs to the technical field of falling body slamming test equipment, and discloses a two-way high-speed falling body slamming test device, a guide rail is arranged at the uppermost end of the whole device, a slide block and a traction device are movably arranged at the lower side of the guide rail, and the traction device is connected with the side surface of the slide block; the upper side of the connecting device is fixedly connected with the bottom of the sliding block, the two ends of the lower side of the connecting device are respectively connected with a lifting rod, the lower ends of the lifting rods are connected with the test model, the lower ends of the side faces of the lifting rods are connected with control switches, and two compression springs are connected between the connecting device and the test model. The laser speed measuring device is fixed to the end, provided with the traction device, of the lower side of the guide rail, and the laser speed measuring device and the control switch are connected with the microcontroller through connecting lines. The device is simple in structure and easy to operate, the test model can be controlled to enter water at a high speed in the horizontal direction, meanwhile, the test model can be controlled to enter water at a high speed in the vertical direction, and therefore the throwing operation requirement is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of free-fall impact test equipment, and particularly relates to a two-way high-speed free-fall impact test device. Background Technique

[0002] During the water-entry launching process of underwater equipment such as unmanned underwater vehicles, the impact load cannot be ignored. The water-entry impact problem is widely applied in many industries, especially in ocean and coastal engineering. Solving the water-entry problem largely depends on the change of the water surface boundary shape, which has strong nonlinearity, making the problem extremely complex and difficult to solve analytically. At the same time, it has an important impact on the structural safety. Currently, for the research on impact loads, in addition to theoretical calculations and simulation analyses, model tests are still an accurate and intuitive method for studying impact loads. And a corresponding free-fall impact test device is necessary for conducting water-entry tests. For some underwater equipment during the launching process, it will have the characteristic of high-speed water entry, that is, the test device needs to enable the model to have a relatively high initial velocity when released, and the velocity mainly includes horizontal and lateral initial velocities.

[0003] Regarding the design of high-speed water-entry impact test devices, some patents have been disclosed currently. For example, a high-speed water-entry impact test device with the publication number CN107607292B. The velocity of this device in the vertical direction mainly relies on free fall and cannot achieve a relatively high initial velocity in the vertical direction. Another example is a water-entry impact test device for the six-degree-of-freedom motion of a structure with the publication number CN115042935A, which realizes the function of enabling the test model to have velocities in multiple degrees-of-freedom directions, but it cannot achieve controllable high-speed water entry of the model and the device is relatively complex. For example, a free-fall impact test device with the publication number CN106556504A can control the three-dimensional attitude of the model, but it cannot achieve horizontal and vertical high-speed water entry of the model. Therefore, the utility model provides a two-way high-speed free-fall impact test device to solve the above problems. Summary of the Utility Model

[0004] To overcome the problems existing in the related technologies, the disclosed embodiments of the utility model provide a two-way high-speed free-fall impact test device.

[0005] The technical solution of the utility model is as follows: A two-way high-speed free-fall impact test device includes:

[0006] A horizontal moving mechanism, including a guide rail, a slider, and a traction device. The guide rail is arranged at the uppermost end of the overall device, and the slider and the traction device are movably installed on the lower side of the guide rail. The traction device is connected to the side of the slider;

[0007] Vertical movement mechanism, including a connecting device, a lifting rod, a control switch and a compression spring. The upper side of the connecting device is fixedly connected to the bottom of the slider. The lower side of the connecting device is respectively connected to a lifting rod at both ends. The lower end of the lifting rod is connected to the test model. The lower end of the side of the lifting rod is connected to the control switch. Two compression springs are connected between the connecting device and the test model;

[0008] Laser velocity measuring device, fixed at one end of the traction device installed on the lower side of the guide rail. The laser velocity measuring device and the control switch are respectively connected to the microcontroller through connecting wires.

[0009] In one embodiment, there are two sliders in total. The two sliders are arranged at intervals. The traction device is connected to the slider on the right end.

[0010] In one embodiment, threaded holes are respectively opened at both ends of the connecting device. The lifting rod is connected to the connecting device through the threaded holes.

[0011] In one embodiment, the control switch is a speed sensor switch.

[0012] Combining all the above technical solutions, the beneficial effects of the present utility model are as follows: Through the combined design of the horizontal movement mechanism and the vertical movement mechanism, the present utility model can simultaneously endow the test model with high-speed initial velocities in the horizontal and vertical directions. The horizontal movement mechanism utilizes the combination of the guide rail, the slider and the traction device to control the acceleration and release of the model in the horizontal direction. The vertical movement mechanism, through the coordinated action of the lifting rod, the control switch and the compression spring, rapidly increases the vertical velocity by using the elastic potential energy of the spring at the moment of model release, so as to achieve the high-speed water entry conditions in two directions. The laser velocity measuring device in the present utility model is connected to the control switch, and the speed threshold can be preset as needed. When the traction device drives the slider and the test model to reach the predetermined horizontal speed, the laser velocity measuring device will trigger the control switch, and then release the compression spring, so that the model also obtains a high-speed initial velocity in the vertical direction, which not only ensures the flexibility of the test, but also improves the controllability and accuracy of the test.

[0013] In the present utility model, the horizontal high speed of the test model is provided by the traction device, and the vertical high speed is provided by the release of the compression spring to convert the elastic potential energy into the kinetic energy of the test model, so as to realize the two-way high-speed free fall impact of the test model. The structure is simple and easy to operate. It can control the high-speed water entry of the test model in the horizontal direction, and at the same time can also control the high-speed water entry of the test model in the vertical direction, so as to meet the operation requirements of the delivery.

[0014] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the disclosure of the present utility model. Brief Description of the Drawings

[0015] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments in line with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0016] Figure 1 is a schematic structural view of a two-way high-speed free-fall impact test device provided by an embodiment of the present utility model;

[0017] Figure 2 is a schematic side view of a two-way high-speed free-fall impact test device provided by an embodiment of the present utility model;

[0018] Figure 3 is a schematic view of the initial horizontal movement of a test model provided by an embodiment of the present utility model;

[0019] Figure 4 is a schematic view of the release of a speed sensor switch after the horizontal speed of a test model provided by an embodiment of the present utility model reaches the target value;

[0020] Figure 5 is a schematic view of the complete release of a compression spring provided by an embodiment of the present utility model;

[0021] In the figure: 1. Guide rail; 2. Slide block; 3. Connecting device; 4. Lifting rod; 5. Speed sensor switch; 6. Test model; 7. Compression spring; 8. Traction device; 9. Laser speed measurement device; 10. Threaded hole. Detailed implementation manners

[0022] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific implementations disclosed below.

[0023] As Figure 1 and Figure 2 shown, the two-way high-speed free-fall impact test device provided by an embodiment of the present utility model includes a horizontal movement mechanism, a vertical movement mechanism, and a laser speed measurement device 9.

[0024] The horizontal movement mechanism includes a guide rail 1, a slide block 2, and a traction device 8. The guide rail 1 is provided at the uppermost end of the overall device. The slide block 2 and the traction device 8 are movably installed on the lower side of the guide rail 1. The traction device 8 is connected to the side of the slide block 2;

[0025] The vertical movement mechanism includes a connecting device 3, a lifting rod 4, a speed sensor switch 5, and a compression spring 7. The upper side of the connecting device 3 is fixedly connected to the bottom of the slider 2. The lower side of the connecting device 3 is respectively connected to a lifting rod 4 at both ends. The lower end of the lifting rod 4 is connected to the test model 6. The lower end of the side of the lifting rod 4 is connected to the speed sensor switch 5. Two compression springs 7 are connected between the connecting device 3 and the test model 6;

[0026] The laser speed measurement device 9 is fixed at one end of the guide rail 1 where the traction device 8 is installed on the lower side. The laser speed measurement device 9 and the speed sensor switch 5 are respectively connected to the microcontroller through connection lines.

[0027] Preferably, two sliders 2 are provided in the embodiment of the present invention. The two sliders are arranged at intervals, and the traction device 8 is connected to the right slider 2.

[0028] Preferably, threaded holes 10 are respectively opened at both ends of the connecting device 3 in the embodiment of the present invention. The lifting rod 4 is connected to the connecting device 3 through the threaded holes 10. The lifting rod 4 is fixed to the connecting device 3 through the threaded holes 10. The extended length of the lifting rod 4 can be adjusted by rotating the thread, and then the deformation amount of the compression spring 7 can be adjusted.

[0029] The working principle of the present invention is as follows: When the present invention is in use, the test model 6 is fixed to the connecting device 3 through two lifting rods 4, and a compression spring 7 is arranged in the middle. The stiffness of the compression spring 7 is k. The two lifting rods 4 are connected to the connecting device 3 through the threaded holes 10. Rotating the thread can adjust the extended length of the lifting rod 4, and then adjust the deformation amount x of the compression spring 7. A speed sensor switch 5 is arranged at the bottom of the lifting rod 4. The speed sensor switch 5 can be controlled to release through the laser speed measurement device 9 located at the right end of the guide rail 1 in cooperation with the microcontroller. The connecting device 3 is arranged on the guide rail 1 through the slider 2 and is connected by the traction device 8, so as to realize the movement in the horizontal direction.

[0030] As Figure 3 shown, the traction device 8 starts to move, providing an initial horizontal velocity for the test model 6.

[0031] As Figure 4 shown, the laser speed measurement device 9 detects the moving speed of the test model 6. The microcontroller connected to the laser speed measurement device 9 can real-time monitor whether the speed signal transmitted by the laser speed measurement device 9 reaches the target speed value. When the microcontroller detects that the horizontal speed reaches the target value v i , the microcontroller will send an electrical signal to the motor of the speed sensor switch 5 to open the speed sensor switch 5.

[0032] As Figure 5As shown, since the compression spring 7 is in a compressed state in front of the speed sensor switch 5, at the moment of release, the compression spring 7 will do work on the test model 6, converting the elastic potential energy of the compression spring 7 into the kinetic energy of the test model 6 in the vertical direction. If the mass of the test model 6 is m, then according to the known kinetic energy theorem formula, the vertical initial release speed of the test model 6 can be calculated as follows:

[0033]

[0034] By adjusting the lifting rod 4 to control the deformation amount x of the compression spring 7, the vertical initial release speed of the test model 6 can be controlled. So far, the test model 6 has completed the release of the free-fall slamming test and has the target horizontal and vertical speeds.

[0035] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] The above is only a relatively preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, any modification, equivalent replacement, and improvement made within the spirit and principle of the present utility model should be covered by the protection scope of the present utility model.

Claims

1. A two-way high-speed falling body impact test device, characterized in that: The device includes: A horizontal moving mechanism, comprising a guide rail (1), a slider (2) and a traction device (8), wherein the guide rail (1) is arranged at the uppermost end of the overall device, the slider (2) and the traction device (8) are movably mounted on the lower side of the guide rail (1), and the traction device (8) is connected to the side of the slider (2); A vertical movement mechanism comprises a connecting device (3), a lifting rod (4), a control switch and a compression spring (7); the upper side of the connecting device (3) is fixedly connected to the bottom of the slider (2); the two ends of the lower side of the connecting device (3) are respectively connected to a lifting rod (4); the lower end of the lifting rod (4) is connected to a test model (6); the lower end of the side of the lifting rod (4) is connected to the control switch; and two compression springs (7) are connected between the connecting device (3) and the test model (6); The laser speed measuring device (9) is fixed to one end of the lower side of the guide rail (1) on which the traction device (8) is installed. The laser speed measuring device (9) and the control switch are respectively connected to the microcontroller via connecting lines.

2. The two-way high-speed falling body impact test device according to claim 1, characterized in that: There are two sliders (2) in total, which are arranged at an interval, and the traction device (8) is connected to the slider (2) at the right end.

3. The two-way high-speed falling body impact test device according to claim 1, characterized in that: The control switch is a speed sensor switch (5).

4. The two-way high-speed falling body impact test device according to claim 1, characterized in that: Threaded holes (10) are respectively provided at both ends of the connecting device (3), and the lifting rod (4) is connected to the connecting device (3) via the threaded holes (10).

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