Inner rotary table of geotechnical centrifuge and geotechnical centrifuge

Abstract

The utility model relates to an inner rotary table of a geotechnical centrifuge and the geotechnical centrifuge, the inner rotary table is arranged in the geotechnical centrifuge and is connected with an inner shaft of the geotechnical centrifuge, the inner rotary table comprises a rack, and a lifting frame is arranged on the rack; the rack is provided with a lifting structure used for guiding the lifting frame to move in the vertical direction. And a horizontal structure for applying pressure to the sample is arranged on the lifting frame. According to the utility model, in the horizontal direction, the servo motor drives the two ball screws which are installed oppositely and rotate in opposite directions, and the two pressurizing rods driven by the ball screws are symmetrical and extend and pressurize simultaneously, so that double-point pressure test can be ensured, and no unbalanced force exists in the rotary drum.

Description

Technical Field

[0001] The utility model relates to the field of centrifuges, in particular to an inner rotating table of a geotechnical centrifuge and the geotechnical centrifuge. Background Art

[0002] The drum geotechnical centrifuge needs to load radial pressure on the sample during the centrifugal experiment, and the position accuracy of the pressure application point is required to be high. Some European countries have developed drum geotechnical centrifuges. The inner turntable of this centrifuge is responsible for applying pressure to the sample in the drum when the centrifuge drum rotates at high speed, so as to test the deformation of the sample after being compressed in the centrifugal environment. For example, the drum geotechnical centrifuge produced by Thomas Broadbent and Sons Limited in the UK has a load level of 450Gt, and the stroke of its inner turntable in the vertical and horizontal directions is only 400mm. With the development of technology, users have put forward technical requirements for a stroke of 1000mm. Its vertical movement uses a linear motor to lift and lower the inner turntable at the top of the centrifuge. The structure is relatively complex, and the cost of later maintenance and repair is relatively high. In addition, there is only one horizontal pressure rod. Pressurization will cause unbalanced force in the drum, which will destroy the dynamic balance of rotation when the centrifuge rotates at high speed. Long-term operation in this way will affect the service life of the equipment, and at the same time, it also causes the maximum load level of the geotechnical centrifuge to be only 450GT. If the load-bearing capacity increases, this unbalanced force will increase exponentially, and the strength and structural requirements of the geotechnical centrifuge will be very high, resulting in extremely high costs.

[0003] Therefore, it is very important to provide an inner turntable which can increase the travel in all directions and balance the force of the geotechnical centrifuge. Utility Model Content

[0004] In view of this, the utility model proposes an inner turntable of a geotechnical centrifuge and a geotechnical centrifuge, aiming to solve the problems existing in the prior art.

[0005] Specifically, the inner turntable of a geotechnical centrifuge of the utility model is arranged inside the geotechnical centrifuge and connected to the inner shaft of the geotechnical centrifuge, including a frame and also including:

[0006] A lifting frame is arranged on the frame;

[0007] A lifting structure for guiding the lifting frame to move in a vertical direction is provided on the frame;

[0008] A horizontal structure for applying pressure to the test sample is provided on the lifting frame;

[0009] The horizontal structure includes:

[0010] A belt disposed transversely in the lifting frame;

[0011] A second servo motor disposed on the lifting frame for driving the belt to move;

[0012] A second lead screw and a third lead screw with opposite rotation directions disposed in the lifting frame;

[0013] A second lead screw nut disposed on the second lead screw;

[0014] A third lead screw nut disposed on the third lead screw;

[0015] A first pressure rod disposed on the second lead screw nut for applying pressure to the test sample;

[0016] And a second pressure rod disposed on the third lead screw nut for applying pressure to the test sample.

[0017] On the basis of the above solution, the lifting structure includes:

[0018] Two guide rails vertically disposed on the frame for guiding the lifting frame;

[0019] A slider disposed on the guide rail for slidingly cooperating with the guide rail and connecting to the lifting frame;

[0020] And a driving assembly disposed on the frame for driving the lifting frame to slide.

[0021] On the basis of the above solution, the driving assembly includes:

[0022] A first servo motor vertically disposed on the frame;

[0023] A first lead screw connected to the first servo motor;

[0024] And a first lead screw nut disposed on the first lead screw for connecting to the lifting frame.

[0025] In addition, a geotechnical centrifuge, the inner shaft of the geotechnical centrifuge is connected to the inner turntable of the geotechnical centrifuge.

[0026] The utility model realizes greater strokes in the vertical and horizontal directions through the lifting structure and the horizontal structure. Among them, in the horizontal direction, one servo motor drives two ball screws installed oppositely and with opposite rotation directions, and the pressure rods driven by the ball screws are two symmetrical ones, which can elongate and apply pressure simultaneously to ensure double-point pressure testing to ensure that there is no unbalanced force in the drum. Description of the Drawings

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not considered as limiting the present utility model. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0028] Figure 1 It is a schematic structural diagram (side view perspective) of the inner turntable of the geotechnical centrifuge in Embodiment 1;

[0029] Figure 2 It is a schematic structural diagram (showing the horizontal structure) of the inner turntable of the geotechnical centrifuge in Embodiment 1;

[0030] Figure 3 It is a partial schematic structural diagram (cross-sectional view) of the inner turntable of the geotechnical centrifuge in Embodiment 1;

[0031] Figure 4 It is a schematic assembly structural diagram of the geotechnical centrifuge and the inner turntable in Embodiment 1. Detailed Embodiments

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0033] Embodiment 1

[0034] As Figures 1 - 3 shown, an inner turntable of a geotechnical centrifuge is arranged inside the geotechnical centrifuge and connected to the inner shaft of the geotechnical centrifuge, and includes a frame 1. A lifting frame 2 is arranged on the frame 1, and a lifting structure 3 for guiding the lifting frame 2 to move in the vertical direction is arranged on the frame 1. A horizontal structure 4 for applying pressure to the test sample is arranged on the lifting frame 2. Specifically, the frame 1 is a cylindrical welded structure, and the lifting frame 2 is a hollow frame structure.

[0035] As a specific embodiment, the lifting structure 3 includes two guide rails 3-1 vertically arranged on the frame 1 for guiding the lifting frame 2, sliders 3-2 arranged on the guide rails 3-1 for slidingly cooperating with the guide rails 3-1 and connected to the lifting frame 2, and a driving assembly 3-3 arranged on the frame 1 for driving the lifting frame 2 to slide.

[0036] Among them, the lifting frame 2 is perpendicular to the guide rail 3-1.

[0037] Specifically, the driving assembly 3-3 includes a first servo motor 3-3-1 vertically arranged on the frame 1, a first lead screw 3-3-2 connected to the first servo motor 3-3-1, and a first lead screw nut 3-3-3 arranged on the first lead screw 3-3-2 for connecting with the lifting frame 2.

[0038] Among them, the first lead screw 3-3-2 can be a ball screw or an ordinary lead screw.

[0039] During use, a pair of guide rails 3-1 are respectively installed on both sides inside the frame 1 to guide the movement of the lifting frame 2. The two sides of the lifting frame 2 are installed on the guide rails 3-1 and can move vertically; in the middle of the frame 1, a first servo motor 3-3-1 and a first lead screw 3-3-2 in the vertical direction are installed near one side of the steel plate. Among them, the first lead screw nut 3-3-3 is connected to the lifting frame 2, and the rotation of the first servo motor 3-3-1 can drive the lifting frame 2 to rise or fall.

[0040] As a specific implementation manner, the horizontal structure 4 includes a belt 4-1 horizontally arranged inside the lifting frame 2, a second servo motor 4-2 arranged on the lifting frame 2 for driving the movement of the belt 4-1, second lead screws 4-3 and third lead screws 4-4 with opposite rotation directions arranged inside the lifting frame 2 (the second lead screws 4-3 and the third lead screws 4-4 are installed on the same axis and are jointly installed on a pulley through key connection. When the second servo motor 4-2 rotates, it will drive the belt 4-1 to rotate through the pulley at the motor end, and the belt 4-1 will drive the common pulley on the second lead screws 4-3 and the third lead screws 4-4 to rotate), a second lead screw nut 4-5 arranged on the second lead screw 4-3, a third lead screw nut 4-6 arranged on the third lead screw 4-4, a first pressure rod 4-7 arranged on the second lead screw nut 4-5 for applying pressure to the test sample, and a second pressure rod 4-8 arranged on the third lead screw nut 4-6 for applying pressure to the test sample.

[0041] During use, the lifting frame 2 is a hollow frame structure, and a second servo motor 4-2 in the horizontal direction is installed in the middle of its interior. The second servo motor 4-2 drives the second lead screws 4-3 and the third lead screws 4-4 in the horizontal direction to rotate simultaneously through the belt 4-1. The second lead screws 4-3 and the third lead screws 4-4 have opposite rotation directions. Therefore, when rotating, the second lead screw nut 4-5 in the horizontal direction and the third lead screw nut 4-6 in the horizontal direction will move towards both ends or towards the middle simultaneously, and will drive the first pressure rod 4-7 and the second pressure rod 4-8 respectively installed on the second lead screw nut 4-5 and the third lead screw nut 4-6 in the horizontal direction. When the first pressure rod 4-7 and the second pressure rod 4-8 move towards both ends, they will apply pressure to the test sample, and the magnitude of the pressure can be measured by installing a pressure sensor.

[0042] Embodiment 2

[0043] As Figure 4 Shown is a schematic diagram of the installation of the inner turntable in the geotechnical centrifuge. In this embodiment, based on the inner turntable of the geotechnical centrifuge in Embodiment 1, a specific implementation manner of the geotechnical centrifuge is provided. The inner turntable will be installed inside the geotechnical centrifuge, connected to the inner shaft, and will rotate together with the inner shaft.

[0044] The vertical direction of the inner turntable of the geotechnical centrifuge of the present utility model is driven by a first servo motor 3-3-1 and a first lead screw 3-3-2, with a compact structure and low maintenance and repair costs; among them, the horizontal direction is driven by a second servo motor 4-2 for two ball screws installed oppositely and with opposite rotation directions. The pressure rods driven by the ball screws are two symmetric ones, which extend and apply pressure simultaneously, ensuring double-point pressure testing, and ensuring that there is no unbalanced force inside the drum. At the same time, the vertical and horizontal strokes are larger.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these changes and modifications.

Claims

1. An inner turntable of a geotechnical centrifuge, arranged inside the geotechnical centrifuge and connected to the inner shaft of the geotechnical centrifuge, comprising a frame (1), characterized in that: Also includes: A lifting frame (2) is arranged on the frame (1); A lifting structure (3) for guiding the lifting frame (2) to move in a vertical direction is arranged on the frame (1); A horizontal structure (4) for applying pressure to the test sample is provided on the lifting frame (2); The horizontal structure (4) comprises: A belt (4-1) arranged transversely in the lifting frame (2); A second servo motor (4-2) disposed on the lifting frame (2) and used for driving the belt (4-1) to move; A second lead screw (4-3) and a third lead screw (4-4) which are arranged in the lifting frame (2) and rotate in opposite directions; a second lead screw nut (4-5) arranged on the second lead screw (4-3); A third lead screw nut (4-6) arranged on the third lead screw (4-4); A first pressure rod (4-7) arranged on the second lead screw nut (4-5) and used for applying pressure to the test piece; and a second pressure rod (4-8) arranged on the third lead screw nut (4-6) for applying pressure to the test piece.

2. The inner turntable of the geotechnical centrifuge according to claim 1, characterized in that: The lifting structure (3) comprises: Two guide rails (3-1) vertically arranged on the frame (1) for guiding the lifting frame (2); A sliding block (3-2) disposed on the guide rail (3-1) and used for slidingly cooperating with the guide rail (3-1) and connected to the lifting frame (2); and a driving assembly (3-3) arranged on the frame (1) and used for driving the lifting frame (2) to slide.

3. The inner turntable of the geotechnical centrifuge according to claim 2, characterized in that: The driving component (3-3) comprises: A first servo motor (3-3-1) arranged on the frame (1) in a vertical direction; a first lead screw (3-3-2) connected to the first servo motor (3-3-1); and a first lead screw nut (3-3-3) arranged on the first lead screw (3-3-2) for connecting with the lifting frame (2).

4. A geotechnical centrifuge, characterized in that: The inner shaft of the geotechnical centrifuge is connected to the inner turntable of the geotechnical centrifuge according to any one of claims 1 to 3.

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