Electromagnetic low-speed launching device in a high gravity centrifuge

Abstract

The application discloses an electromagnetic low-speed launching device in a supergravity centrifuge, which comprises a box body, a top plate arranged on the top of the box body, a hinged support arranged under the top plate, one end of a first supporting rod connected with the hinged support, the other end of the first supporting rod connected with one end of a second supporting rod, the other end of the second supporting rod connected with a telescopic pipeline, an electrified wire wound on the surface of the second supporting rod, a cavity arranged at the bottom of one end of the telescopic pipeline connected with the second supporting rod, a small ball arranged in the cavity, and a launching test buffer layer arranged at the bottom of the box body. The launching device can be remotely controlled, the launching time can be controlled, the launching speed and angle can be adjusted, and the device can effectively launch the solid in the supergravity centrifuge. The device is simple and convenient to operate, high in repeatability, stable and reliable in operation.

Description

Technical Field

[0001] This invention belongs to the technical field of hypergravity mechanical testing devices, and particularly relates to an electromagnetic low-speed launching device inside a hypergravity centrifuge. Background Technology

[0002] Hypergravity centrifuges can generate three fundamental scientific effects: accelerated separation, energy enhancement, and spacetime compression. This allows for the reproduction of the stress states of large-scale prototype buildings using small-scale models, enabling in-depth research on most geotechnical engineering problems, providing technical support for design and construction, and better guiding practice. Currently, hypergravity centrifuges primarily provide an equivalent high-magnitude acceleration field, allowing for the reproduction of the stress state of geotechnical engineering prototypes in models and enabling scaled-down model tests for solid impact experiments on hypergravity scaled-down models.

[0003] In high-gravity centrifuges, the main launch devices for impact tests are air guns and springs. However, since there are no reports on low-speed launch devices for solid balls in high-gravity centrifuges, domestic research institutions have difficulty conducting relevant experiments on low-speed solid impacts in high-gravity centrifuges.

[0004] There is an urgent need to develop an electromagnetic low-speed launching device for use in a centrifuge with high gravity. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an electromagnetic low-speed launching device for a centrifuge. This launching device can better achieve the effect of remote control of the centrifuge launching device, and can control the launching angle and speed of the small ball in the centrifuge launching device, thereby effectively improving the accuracy and stability of the experiment and obtaining more accurate experimental results.

[0006] The objective of this invention is achieved through the following technical solution: an electromagnetic low-speed launching device for a centrifuge, comprising a housing, a top plate on the top of the housing; a hinge support below the top plate; a first support rod connected to one end of the hinge support; a second support rod connected to the other end of the first support rod; a retractable pipe connected to the other end of the second support rod; a current-carrying wire wound around the surface of the second support rod; a cavity at the bottom of the end of the second support rod connected to the retractable pipe; a launching ball contained in the cavity; an external circuit connected to the current-carrying wire; and a launch test buffer layer at the bottom of the housing.

[0007] Furthermore, the external circuit is controlled by an external computer system, and the current magnitude and switching are controlled by the external computer system.

[0008] The current generated by the energized conductor 7 should conform to the following relationship:

[0009]

[0010] Where m is the mass of the launching ball, n is the control coefficient of the centrifuge control center, g is the gravitational acceleration on Earth, K is the safety factor, L is the length of the second support rod, N is the number of turns of the current-carrying wire, μ0 is the vacuum permeability, and r is the radius of the launching ball.

[0011] Furthermore, the launch velocity v of the ball should have the following relationship with the length of the expandable tube:

[0012]

[0013] Where m is the mass of the launched ball, n is the control coefficient of the centrifuge control center, g is the gravitational acceleration on Earth, θ is the angle between the pipe and the horizontal plane, μ is the friction coefficient of the expandable pipe, and L is the length of the expandable pipe.

[0014] Furthermore, the top plate and the hinge support are connected by a screw.

[0015] Furthermore, the hinge support is connected to the first support rod via a screw, and the launch angle of the first support rod can be controlled by adjusting the tightness of the screw.

[0016] Furthermore, the first support rod and the second support rod are connected by a rubber body, ensuring that the conductive wires on the surface of the second support rod will not affect the first support rod during the energization process, thereby improving the accuracy and stability of the launch angle of the launching device.

[0017] Furthermore, the cavity is hemispherical and is used to hold the launching ball, which is a metal component that can be attracted by a magnet.

[0018] Furthermore, the retractable pipe is made of metal, and the launch speed of the launcher can be controlled by controlling the length of the pipe.

[0019] The beneficial effects of this invention are as follows: The launch angle of the launching device can be controlled by adjusting the tightness of the screw. The current in the energized wire can be remotely controlled, allowing for remote control of the launching device's activation during centrifuge operation. The retractable lower tube allows for control of the launch speed of the launching ball by adjusting its length. Using the centrifuge model launching device of this invention, the launch time, launch speed, and launch angle of the launching ball can be remotely and precisely controlled, while ensuring the repeatability of the launch speed and launch angle, effectively improving the launch accuracy during centrifuge model experiments. Attached Figure Description

[0020] Figure 1 This is a front view of the launching device of the present invention.

[0021] Figure 2 This is a top view of the launching device of the present invention.

[0022] Figure 3 This is a side view of the launching device of the present invention.

[0023] Figure 4 This is a schematic diagram of the operation of the launching device of the present invention.

[0024] Figure 5 This is a front cross-sectional view of the launching device of the present invention located inside the centrifuge chamber.

[0025] Among them, the top plate 1, hinge support 2, screw 3, first support rod 4, rubber body 5, second support rod 6, power-carrying wire 7, telescopic pipe 8, cavity 9, supergravity centrifuge model box 10, launch test buffer layer 11, centrifuge 12, and counterweight 13 are included. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] like Figure 1-4 As shown, an electromagnetic low-speed launching device for a centrifuge model box according to the present invention includes a box body 10, a top plate 1 on the top of the box body 10, and the top plate 1 is slidable; a hinge support 2 is provided below the top plate 1; the hinge support 2 is connected to one end of a first support rod 4; the other end of the first support rod 4 is connected to one end of a second support rod 6; the other end of the second support rod 6 is connected to a telescopic pipe 8; a current-carrying wire 7 is wound around the surface of the second support rod 6; a cavity 9 is provided at the bottom of the end of the second support rod 6 connected to the telescopic pipe 8; the cavity 9 is filled with a launching ball; the current-carrying wire 7 is connected to an external circuit; and a launch test buffer layer 11 is provided at the bottom of the box body 10.

[0029] The top plate 1 is connected to the hinge support 2 by a screw 3; the hinge support 2 is connected to the first support rod 4 by a screw 3, and the launch angle of the first support rod can be controlled by controlling the tightness of the screw; the first support rod 4 and the second support rod 6 are connected by a rubber body 5, ensuring that the energized wire 7 on the surface of the second support rod 6 will not affect the first support rod 4 during the energization process, thus improving the accuracy and stability of the launch angle of the launching device; the energized wire 7 is connected to an external circuit, which is controlled by an external computer system, and the current magnitude and switching are controlled by the external computer system; the cavity 9 is hemispherical and is used to hold the launching ball, which is a metal component that can be attracted by a magnet; the telescopic pipe 8 is a metal component with a tensile strength greater than or equal to 175 MPa and a yield strength greater than or equal to 235 MPa, and the launch speed of the launcher can be controlled by controlling the length of the pipe.

[0030] In this embodiment, the telescopic pipe 9 is a three-section telescopic pipe made of aluminum alloy, namely 8-1, 8-2, and 8-3. The size of 8-1 is slightly smaller than that of 8-2, and the size of 8-2 is slightly smaller than that of 8-3, which ensures that the pipe can be extended and retracted normally, helps to control the length of the pipe, and improves the accuracy and stability of the launch speed of the launching device.

[0031] The working process of this invention is as follows:

[0032] Before conducting the centrifugation test under hypergravity, the required launch angle and launch speed are first determined. The launch angle is adjusted to the required value using the first support 4 and the screw 3, and the launch speed is controlled to the required value by adjusting the length of the telescopic pipe 8. Then, the energized wire 7 is connected to the circuit controlled by an external computer system, and the current value is adjusted to a suitable value. The launch ball is then adsorbed into the cavity 9 at the bottom of the second support 6, and the launch device is adjusted. Figure 5 As shown, the device of the present invention is installed in the centrifuge chamber of centrifuge 12, and a counterweight 13 of the same mass as the chamber 10 is installed on the other side. After the preparation work for the hypergravity centrifugation test is completed, the centrifuge is started to the required ng value (ng is the magnitude of acceleration provided by the hypergravity centrifugation model chamber). After stabilization, the power is cut off by the external computer system control circuit, and the ball is launched out through the retractable pipe 8, and the test is completed.

[0033] The launch velocity v of the small ball and the length of the expandable pipe 8 should have the following relationship:

[0034] Where m is the mass of the launched ball, n is the control coefficient of the centrifuge control center, g is the gravitational acceleration on Earth; θ is the angle between the pipe and the horizontal plane; μ is the friction coefficient of the telescopic pipe 8, which can be calibrated under normal gravity conditions according to experimental requirements, and this value is only related to the material of the telescopic pipe 8; L is the length of the telescopic pipe 8.

[0035] Before launch, the ball should be firmly attached to the cavity 9 at the bottom of the second support rod 6, and the generated magnetic force should be greater than the weight of the ball. Therefore, the current generated by the current-carrying wire 7 on the surface of the second support rod 6 should conform to the following relationship:

[0036] Where m is the mass of the launching ball, n is the control coefficient of the centrifuge control center, g is the gravitational acceleration on Earth; K is the safety factor, typically taken as 2.0; L is the length of the second support rod 6; N is the number of turns of the current-carrying wire 7; and μ0 is the vacuum permeability, typically taken as 4π·10⁻⁶. -7 ; r is the radius of the launched ball.

[0037] This allows for remote control of the launch time of the launch device, while ensuring the stability and repeatability of the launch.

[0038] The above embodiments are only used to illustrate the design concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications made based on the principles and design ideas disclosed in the present invention are within the protection scope of the present invention.

[0039] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0040] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. An electromagnetic low-speed launching device for use in a centrifuge, comprising a housing (10), characterized in that, The top of the housing (10) is provided with a top plate (1); a hinge support (2) is provided below the top plate (1); the hinge support (2) is connected to one end of the first support rod (4); the other end of the first support rod (4) is connected to one end of the second support rod (6); the other end of the second support rod (6) is connected to a telescopic pipe (8); a current-carrying wire (7) is wound around the surface of the second support rod (6); a cavity (9) is provided at the bottom of the end of the second support rod (6) connected to the telescopic pipe (8); the cavity (9) is filled with a launching ball; the telescopic pipe (8) controls the launching speed of the launching ball by controlling the length of the pipe; a launching test buffer layer (11) is provided at the bottom of the housing (10). The current generated by the energized conductor (7) conforms to the following relationship: ； in For the mass of the launching ball, This refers to the coefficient controlled by the control center of the centrifuge. This refers to the acceleration due to gravity on Earth. For safety factor; The length of the second support rod (6); The number of turns of the current-carrying wire (7) wrapped around it; Permeability of free space; Let be the radius of the ball being launched.

2. The electromagnetic low-speed launching device in a centrifuge as described in claim 1, characterized in that, Ball launch speed The length of the expandable pipe (8) has the following relationship: ； in The angle between the pipe and the horizontal plane; The coefficient of friction of the expandable pipe (8); The length of the expandable pipe (8) is given.

3. The electromagnetic low-speed launching device in a centrifuge as described in claim 1, characterized in that, The top plate (1) and the hinge support (2) are connected by a screw (3).

4. The electromagnetic low-speed launching device in a centrifuge as described in claim 1, characterized in that, The hinge support (2) is connected to the first support rod (4) by a screw (3).

5. The electromagnetic low-speed launching device in a centrifuge as described in claim 3, characterized in that, The first support rod (4) and the second support rod (6) are connected by a rubber body (5).

6. The electromagnetic low-speed launching device in a centrifuge as described in claim 1, characterized in that, The cavity (9) is hemispherical.

7. The electromagnetic low-speed launching device in a centrifuge as described in claim 6, characterized in that, The expandable pipe (8) is made of metal.

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