Bidirectional bearing plane moving bearing and centrifugal machine vibration table

Abstract

The utility model discloses a two-way bearing plane moving bearing which comprises a loading shaft, a bearing end cover, a ball, a retainer, a supporting plate, a gasket and a locking nut, the ball is restrained between the bearing end cover and the supporting plate through the retainer; the bearing end cover, the supporting plate, the retainer and the gasket are connected together through the loading shaft and are integrally pre-tightened through the locking nut. Motion decoupling of the vibration table of the centrifugal machine can be achieved, vibration can be effectively transmitted in the axial direction, follow-up can be conducted in the radial direction, and good guidance quality is achieved; the centrifugal machine vibration table adopting the bidirectional bearing plane moving bearing is simple in composition and compact in structure, and can solve the oil leakage problem of a hydrostatic pressure bearing and the problems of energy consumption and control nonlinearity caused by a laminated rubber bearing.

Description

Technical Field

[0001] This utility model belongs to the technical field of vibration testing equipment, specifically relating to a bidirectional load-bearing planar moving bearing and a centrifuge vibration table. Background Technology

[0002] Centrifuge shaking tables are currently the most effective and advanced scientific experimental platform for studying geotechnical earthquake engineering and soil dynamics, possessing time-reduction and scale-reduction effects. For example, in a 1-meter-deep soil model test conducted on a centrifuge shaking table, when the centrifugal acceleration reaches 100g, the bottom of the soil model can reproduce the self-weight stress level at a depth of 100 meters in situ. Furthermore, by applying seismic waves or other excitations to the bottom of the model using a centrifuge shaking table, the dynamic characteristics and failure behavior of the prototype structure under real seismic waves or other excitations can be reproduced, which is of great value for predicting the seismic safety of engineering projects. As research continues, the demand for centrifuge shaking tables is also increasing, evolving from traditional unidirectional shaking tables to bidirectional and even tridirectional shaking tables in terms of vibration direction. Among these advancements, the most critical technology is motion-guided decoupling technology.

[0003] In response, researchers have made many beneficial explorations. For example, patent application CN111780938A discloses a three-dimensional centrifuge vibration table that uses stacked rubber bearings for motion decoupling. However, stacked rubber bearings suffer from shear energy loss and can cause nonlinear effects on waveform control. Another example is patent application CN117109843A, which discloses a three-dimensional centrifuge vibration table. However, because it uses hydrostatic support, it requires an additional hydraulic system, increasing the system's complexity. Furthermore, hydrostatic support poses a risk of oil leakage in centrifugal environments, which is difficult to overcome.

[0004] Therefore, there is an urgent need to develop a motion decoupling device for a centrifuge vibration table and a corresponding centrifuge vibration table to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a bidirectional load-bearing planar moving bearing to achieve motion decoupling of the centrifuge vibration table. This bearing can effectively transmit vibration in the axial direction and can follow the movement in the radial direction.

[0006] The purpose of this invention is to provide a centrifuge vibration table that can achieve triaxial or biaxial vibration. It is simple in composition and compact in structure, and it does not have the risk of oil leakage of hydrostatic support, nor does it have the shear energy consumption and nonlinear effect on waveform control of stacked rubber support.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A bidirectional load-bearing planar sliding bearing includes a loading shaft, a bearing end cap, balls, a cage, a support plate, a washer, and a lock nut; the balls are constrained between the bearing end cap and the support plate by the cage; the bearing end cap, support plate, cage, and washer are connected together by the loading shaft and pre-tightened by the lock nut.

[0009] Furthermore, one end of the loading shaft is designed with a connecting flange, which can be connected to the driving component; the other end is designed with a thread, which cooperates with the locking nut to achieve pre-tightening of the overall structure.

[0010] Furthermore, the bearing end cover is generally circular or square in structure, with a through hole in the middle for the loading shaft to pass through; the bearing end cover has a flange at its edge to constrain the cage.

[0011] Furthermore, the cage has a through hole in the middle for the loading shaft to pass through; the cage has several spherical grooves for mounting the balls; the balls can rotate freely in the spherical grooves of the cage without falling out, and the balls will protrude from the surface of the cage after installation; the cage and the balls are arranged together between the support plate and the bearing end cover, and the balls contact the plane of the support plate and the plane of the bearing end cover respectively, thereby realizing the relative translation between the support plate and the bearing end cover.

[0012] Furthermore, the two ends of the support plate are flat, forming a ball-plane pair with the ball; a through hole is provided in the middle of the support plate for the loading shaft to pass through, and the size of the through hole needs to reserve a certain space for the radial movement of the loading shaft; a connecting flange is designed on the side of the support plate.

[0013] A centrifuge vibration table includes a bidirectional load-bearing planar sliding bearing, a horizontal actuator, a slide, a base, an accumulator, and a vertical actuator. The horizontal actuator includes a cylinder and a piston rod. The cylinder is connected to the base, and the piston rod is connected to the slide via the bidirectional load-bearing planar sliding bearing. The vertical actuator includes a vertical actuator cylinder and a vertical actuator piston rod. The vertical actuator cylinder is connected to the base, and the vertical actuator piston rod is connected to the slide via the bidirectional load-bearing planar sliding bearing. The accumulator is fixed on the base and supplies oil to the horizontal and vertical actuators.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The bidirectional load-bearing planar moving bearing of this utility model realizes the decoupling of the three-dimensional or bidirectional motion of the vibration table. Specifically, the internal clearance of the bidirectional load-bearing planar moving bearing is eliminated by pre-tightening the nut, and the bidirectional tensile and compressive vibration can be realized in the axial direction. The ball and plane pairs formed by the ball, the support plate, and the bearing end cover respectively realize the relative translation between the support plate and the bearing end cover. Moreover, since the rolling friction coefficient is very small, low power consumption radial follow-up can be realized.

[0016] 2. The centrifuge vibration table of this utility model can achieve triaxial or biaxial vibration, and has a simple composition and compact structure. It does not have the risk of oil leakage of hydrostatic support, nor does it have the shear energy consumption and nonlinear effect on waveform control of stacked rubber bearings. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a bidirectional load-bearing planar sliding bearing according to the present invention.

[0018] Figure 2 This is an enlarged view of point A of a bidirectional load-bearing planar sliding bearing according to this utility model;

[0019] Figure 3 This is an isometric view of a bidirectional load-bearing planar sliding bearing according to the present invention.

[0020] Figure 4 This is a schematic diagram of the upper structure of a centrifuge vibration table according to the present invention;

[0021] Figure 5 This is a schematic diagram of the lower structure of a centrifuge vibration table according to the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of a horizontal actuator and a bidirectional load-bearing planar moving bearing for a centrifuge vibration table according to the present invention.

[0023] Figure 7 This is a schematic diagram of the vertical actuator and the bidirectional load-bearing planar moving bearing of a centrifuge vibration table according to the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Bidirectional load-bearing planar sliding bearing; 2. Horizontal actuator; 3. Slide table; 4. Base; 5. Accumulator; 6. Vertical actuator; 11. Loading shaft; 12. Bearing end cover; 13. Ball; 14. Cage; 15. Support plate; 16. Washer; 17. Lock nut; 21. Piston rod; 22. Cylinder; 61. Vertical actuator piston rod; 62. Vertical actuator cylinder. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. The described embodiments are only some examples of this utility model and are not intended to limit this utility model.

[0027] refer to Figures 1-3 A bidirectional load-bearing planar sliding bearing includes a loading shaft (11), a bearing end cap (12), balls (13), a cage (14), a support plate (15), a washer (16), and a locking nut (17); the balls (13) are constrained between the bearing end cap (12) and the support plate (15) by the cage (14); the bearing end cap (12), the support plate (15), the cage (14), and the washer (16) are connected together by the loading shaft (11) and pre-tightened by the locking nut (17).

[0028] In this embodiment, one end of the loading shaft (11) is designed with a connecting flange for connecting with the driving component; the other end is designed with a thread, which cooperates with the locking nut (17) to achieve pre-tightening of the overall structure.

[0029] In this embodiment, the bearing end cover (12) is generally circular or square in structure, with a through hole in the middle for the loading shaft (11) to pass through; the edge of the bearing end cover (12) is provided with a flange for constraining the cage (14).

[0030] In this embodiment, the retainer (14) has a through hole in the middle for the loading shaft (11) to pass through; the retainer (14) has several spherical grooves for installing the balls (13); the balls (13) can rotate freely in the spherical grooves of the retainer (14) without falling out, and the balls (13) protrude from the surface of the retainer (14) after installation; the retainer (14) and the balls (13) are arranged together between the support plate (15) and the bearing end cap (12), and the balls (13) are in contact with the plane of the support plate (15) and the plane of the bearing end cap (12) respectively.

[0031] In this embodiment, the two ends of the support plate (15) are flat, forming a ball-plane pair with the ball (13); a through hole is provided in the middle of the support plate (15) for the loading shaft (11) to pass through, and the size of the through hole needs to reserve a certain space for the radial movement of the loading shaft (11); a connecting flange is designed on the side of the support plate (15).

[0032] The main features of this bidirectional load-bearing planar sliding bearing are its ability to transmit axial force and perform radial follow-up. Therefore, this bidirectional load-bearing planar sliding bearing can be used not only in centrifuge vibration tables, but also in other equipment and application scenarios with the above-mentioned characteristics.

[0033] refer to Figures 4-7 A centrifuge vibration table includes a bidirectional load-bearing planar sliding bearing (1), a horizontal actuator (2), a slide (3), a base (4), an accumulator (5), and a vertical actuator (6). The horizontal actuator (2) includes a cylinder (22) and a piston rod (21). The cylinder (22) is connected to the base (4), and the piston rod (21) is connected to the slide (3) through the bidirectional load-bearing planar sliding bearing (1). The vertical actuator (6) includes a vertical actuator cylinder (62) and a vertical actuator piston rod (61). The vertical actuator cylinder (62) is connected to the base (4), and the vertical actuator piston rod (61) is connected to the slide (3) through the bidirectional load-bearing planar sliding bearing (1). The accumulator (5) is fixed on the base (4) and supplies oil to the horizontal actuator (2) and the vertical actuator (6).

[0034] In this embodiment, the Z direction is the direction of centrifugal force. The vertical actuator (6) needs to balance the centrifugal force and provide the Z direction excitation force for the slide (3) and the test model.

[0035] In this embodiment, the triaxial vibration of the centrifuge vibration table can be achieved by combining the bidirectional bearing planar moving bearing (1), the horizontal actuator (2), and the vertical actuator (6). In fact, this utility model can also achieve bidirectional and unidirectional vibration of the centrifuge vibration table according to different combinations of the bidirectional bearing planar moving bearing (1), the horizontal actuator (2), and the vertical actuator (6). When the centrifuge vibration table vibrates in the Z direction, the excitation force provided by the vertical actuator (6) is transmitted to the slide table (3) through the bidirectional bearing planar moving bearing (1) connected to it. At this time, the bidirectional bearing planar moving bearing (1) connected to the horizontal actuator (2) can follow the slide table (3) in the Z direction. If all the horizontal actuators (2) are not excited, unidirectional Z-axis vibration can be achieved. Similarly, unidirectional X-axis, unidirectional Y-axis, XY bidirectional, XZ bidirectional, YZ bidirectional, and XYZ tridirectional vibration can be achieved.

[0036] The above description is only a part of the specific embodiments of this utility model and is not intended to limit this utility model. Any changes, modifications, additions, reductions, or substitutions made without departing from the technical solution of this utility model and within its essential scope are also within the protection scope of this utility model.

Claims

1. A bidirectional load-bearing planar sliding bearing, characterized in that, It includes a loading shaft (11), a bearing end cap (12), balls (13), a cage (14), a support plate (15), a gasket (16), and a locking nut (17); the balls (13) are constrained between the bearing end cap (12) and the support plate (15) by the cage (14); the bearing end cap (12), the support plate (15), the cage (14), and the gasket (16) are connected together by the loading shaft (11) and are pre-tightened as a whole by the locking nut (17).

2. The bidirectional load-bearing planar sliding bearing according to claim 1, characterized in that, One end of the loading shaft (11) is designed with a connecting flange, which can be connected to the driving component; the other end is designed with a thread, which cooperates with the locking nut (17) to achieve pre-tightening of the overall structure.

3. The bidirectional load-bearing planar sliding bearing according to claim 1, characterized in that, The bearing end cap (12) is generally circular or square in structure, with a through hole in the middle for the loading shaft (11) to pass through; the edge of the bearing end cap (12) is provided with a flange for constraining the cage (14).

4. The bidirectional load-bearing planar sliding bearing according to claim 1, characterized in that, The retainer (14) has a through hole in the middle for the loading shaft (11) to pass through; the retainer (14) has several spherical grooves for mounting the balls (13); the balls (13) can rotate freely in the spherical grooves of the retainer (14) without falling out, and the balls (13) protrude from the surface of the retainer (14) after installation; the retainer (14) and the balls (13) are arranged together between the support plate (15) and the bearing end cover (12), and the balls (13) are in contact with the plane of the support plate (15) and the plane of the bearing end cover (12) respectively.

5. A bidirectional load-bearing planar sliding bearing according to claim 1, characterized in that, The two ends of the support plate (15) are flat, forming a ball-plane pair with the ball (13); a through hole is provided in the middle of the support plate (15) for the loading shaft (11) to pass through, and the size of the through hole needs to reserve a certain space for the radial movement of the loading shaft (11); a connecting flange is designed on the side of the support plate (15).

6. A centrifuge vibration table, characterized in that, The device includes a bidirectional load-bearing planar sliding bearing (1) as described in claim 1, a horizontal actuator (2), a slide (3), a base (4), an accumulator (5), and a vertical actuator (6); the horizontal actuator (2) includes a cylinder (22) and a piston rod (21), the cylinder (22) being connected to the base (4), and the piston rod (21) being connected to the slide (3) via the bidirectional load-bearing planar sliding bearing (1); the vertical actuator (6) includes a vertical actuator cylinder (62) and a vertical actuator piston rod (61), the vertical actuator cylinder (62) being connected to the base (4), and the vertical actuator piston rod (61) being connected to the slide (3) via the bidirectional load-bearing planar sliding bearing (1); the accumulator (5) is fixed on the base (4) and supplies oil to the horizontal actuator (2) and the vertical actuator (6).

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