Low-friction hydraulic sliding bearing capable of withstanding axial forces

Abstract

The application relates to the field of sliding supports, and particularly discloses a low-friction hydraulic sliding support capable of bearing axial force, which comprises a sliding rail and a sliding block arranged on the sliding rail, a hydraulic jack is fixedly arranged on the sliding block and used for applying axial pressure to a test object; a hydraulic oil groove is arranged on one side of the sliding block close to the sliding rail, and a hydraulic oil pump is connected to the hydraulic oil groove; a hydraulic oil seal is arranged in the hydraulic oil groove and used for sealing the gap between the sliding block and the sliding rail. The pressure of the hydraulic oil in the hydraulic oil groove and the external axial pressure are offset to each other, the sliding block and the sliding rail are lubricated by the hydraulic oil, and thus the friction force borne by the sliding block under the condition that the external axial pressure is relatively large can be relatively small, and the friction force can be calculated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sliding support, in particular to a low-friction hydraulic sliding support capable of bearing axial force. BACKGROUND

[0002] In structural static test and structural seismic performance test, it is usually required to apply load to the test object in two directions at the same time, generally keeping the axial pressure of the test object constant, while gradually increasing the monotonic load or cyclic load in the direction perpendicular to the axial pressure. Therefore, the sliding support is required to be able to follow the sliding under small friction force while bearing large axial pressure.

[0003] At present, rolling plate support or sliding rail support is generally used, when the external axial pressure is large, the friction force when the support follows the sliding is large, and the size of the friction force is unknown, which directly affects the accuracy of the test process and results. SUMMARY

[0004] In order to improve the problem that the friction force of the current sliding support is large when the axial pressure is large, the present application provides a low-friction hydraulic sliding support capable of bearing axial force.

[0005] The low-friction hydraulic sliding support capable of bearing axial force provided by the present application adopts the following technical scheme:

[0006] The low-friction hydraulic sliding support capable of bearing axial force comprises:

[0007] A sliding rail;

[0008] A sliding block is slidingly arranged on the sliding rail, and a hydraulic jack for applying axial pressure to the test object is fixedly arranged on the side of the sliding block away from the sliding rail; a hydraulic oil groove is formed on the side of the sliding block close to the sliding rail, and an oil supply assembly for supplying oil to the hydraulic oil groove is connected to the hydraulic oil groove;

[0009] A sealing element is arranged in the hydraulic oil groove to seal the gap between the sliding block and the sliding rail.

[0010] The axial pressure is applied between the sliding block and the test object by the hydraulic jack, and the oil is supplied to the hydraulic oil groove by the oil supply assembly, the pressure of the hydraulic oil in the hydraulic oil groove and the external axial pressure are offset to each other, so that the pressure between the sliding block and the sliding rail is reduced, and thus the friction force received by the sliding block when sliding can be kept small even under large external axial pressure.

[0011] Further, a sliding groove adapted to the sliding of the sliding rail is formed on the sliding block, the hydraulic oil groove is formed on the inner bottom wall of the sliding groove, and the gap between the sliding block and the sliding rail is communicated with the hydraulic oil groove.

[0012] Further, the slide rail is fixedly provided with protrusions on both sides, the protrusions extend along the sliding track of the sliding block, and the sliding block is provided with grooves on the inner side wall of the sliding groove, which are adapted to the sliding of the protrusions.

[0013] When the sliding block slides in the sliding groove, the protrusions slide along the grooves, thereby helping to avoid the sliding block from falling off the slide rail; under the action of the oil supply assembly, the hydraulic oil in the hydraulic oil groove can penetrate into the gap between the sliding block and the slide rail, forming an oil film therebetween, thereby lubricating the sliding block and the slide rail.

[0014] Further, the slide rail is fixedly provided with limit blocks at both ends of the protrusions, for limiting the sliding of the sliding block.

[0015] The limit blocks limit the sliding block at both ends of the sliding track, thereby helping to avoid the sliding block from falling off the slide rail.

[0016] Further, the sealing member is a hydraulic oil seal, which comprises a planar portion and an annular portion fixedly connected to the circumferential side of the planar portion; the planar portion is provided with a through hole, and the annular portion is used for sealing the gap between the sliding block and the slide rail.

[0017] Further, the annular portion is provided with a side abutting surface and a top abutting surface, the side abutting surface abuts against the inner side wall of the hydraulic oil groove, and the top abutting surface abuts against the bottom surface of the slide rail.

[0018] Further, the hydraulic oil seal is made of an elastic material.

[0019] When the hydraulic jack applies an axial pressure, the top abutting surface of the hydraulic oil seal abuts against the bottom surface of the slide rail, the pressure of the hydraulic oil in the hydraulic oil groove pushes the hydraulic oil seal towards the slide rail, at the same time, the hydraulic oil penetrates outwardly along the gap between the side abutting surface and the inner side wall of the hydraulic oil groove, and the hydraulic oil penetrates into the gap between the sliding block and the slide rail, thereby forming an oil film therebetween; when the oil pressure between the sliding block and the slide rail is balanced with the external atmospheric pressure, the hydraulic oil stops penetrating.

[0020] Further, the calculation formula of the sliding friction force F that the sliding block receives when sliding is as follows:

[0021]

[0022] In the formula, μ is the friction coefficient between the oil seal and the slide rail under the condition of oil film lubrication, N is the external axial pressure applied by the hydraulic jack, A0 is the area of the inner bottom surface of the hydraulic oil groove, and A1 is the area of the top abutting surface of the hydraulic oil seal.

[0023] The pressure between the sliding block and the sliding rail is reduced due to the pressure of the hydraulic oil in the hydraulic oil groove and the external axial pressure canceling each other, in addition, the oil film between the sliding block and the sliding rail reduces the friction coefficient between the sliding block and the sliding rail, so that the friction between the sliding block and the sliding rail can be ignored, and the friction force received by the sliding block when sliding is only the sliding friction force between the top abutting surface of the hydraulic oil seal and the bottom surface of the sliding rail; at the same time, the oil pressure in the hydraulic oil groove can transmit most of the external axial pressure, and the axial pressure transmitted between the sliding block and the sliding rail through the oil seal accounts for a very small proportion, and the proportion is the ratio of the area of the top abutting surface of the hydraulic oil seal to the area of the inner bottom surface of the hydraulic oil groove.

[0024] Further, the hydraulic oil groove is provided with at least two groups, and a plurality of groups of the hydraulic oil groove are arranged along the sliding track of the sliding block in sequence.

[0025] By arranging a plurality of groups of hydraulic oil grooves, the pressure applied by the hydraulic jack to the sliding block is uniformly transmitted to the sliding rail, which is beneficial to the stable sliding of the sliding block.

[0026] Further, each group of the hydraulic oil groove is connected with an oil pressure gauge.

[0027] The oil pressure gauge displays the oil pressure in the hydraulic oil groove, which is convenient for adjusting the oil pressure in the hydraulic oil groove according to the change of the external axial pressure.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. By canceling each other between the pressure of the hydraulic oil in the hydraulic oil groove and the external axial pressure, and by lubricating between the sliding block and the sliding rail through the hydraulic oil, the friction force received by the sliding block when sliding can be kept small even under the condition of large external axial pressure, so that the present application can withstand large external axial pressure;

[0030] 2. The friction force received by the sliding block when sliding can be calculated, which is beneficial to improve the accuracy of the test results and is convenient for carrying out various structural static tests or seismic performance tests which need to apply bidirectional load. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0032] Figure 2 is a schematic diagram of the sliding block in the embodiment of the present application;

[0033] Figure 3 is a schematic diagram of the sliding rail in the embodiment of the present application;

[0034] Figure 4 is a partial sectional view schematic diagram of the embodiment of the present application mainly used to show the hydraulic oil seal and the hydraulic oil groove;

[0035] Figure 5 is a schematic view of the hydraulic oil seal in the embodiment of the present application.

[0036] Reference signs: 1 - slider; 11 - sliding groove; 2 - sliding rail; 3 - oil pipe; 4 - oil pressure gauge; 51 - convex strip; 52 - limiting block; 53 - groove; 6 - hydraulic jack; 7 - hydraulic oil groove; 8 - hydraulic oil seal; 81 - flat part; 811 - through hole; 82 - annular part; 821 - side abutting surface; 822 - top abutting surface. DETAILED DESCRIPTION

[0037] The following will be described in detail in combination with the accompanying Figures 1-5 The present application is further described in detail.

[0038] The embodiment of the present application discloses a low-friction hydraulic sliding support capable of bearing axial force. Referring to Figure 1 and Figure 2 , the low-friction hydraulic sliding support capable of bearing axial force comprises a sliding rail 2 and a slider 1 slidingly arranged on the sliding rail 2, and specifically, the slider 1 is provided with a sliding groove 11 adapted to slide with the sliding rail 2.

[0039] Referring to Figure 2 and Figure 3 , convex strips 51 are fixedly arranged on both sides of the sliding rail 2, the convex strips 51 extend along the sliding track of the slider 1, and the slider 1 is provided with grooves 53 adapted to slide with the convex strips 51 on the inner side wall of the sliding groove 11. Limiting blocks 52 are fixedly arranged at both ends of the convex strips 51 on the sliding rail 2, for limiting the sliding of the slider 1.

[0040] Referring to Figure 1 , a hydraulic jack 6 for applying axial pressure to a test object is fixedly arranged on the side of the slider 1 away from the sliding rail 2.

[0041] Referring to Figure 1 and Figure 2 , the slider 1 is provided with hydraulic oil grooves 7 with a circular cross-sectional profile on the inner bottom wall of the sliding groove 11, and the hydraulic oil grooves 7 are connected with an oil supply assembly for supplying oil to the hydraulic oil grooves 7, the oil supply assembly comprising an oil pipe 3 communicated with the hydraulic oil grooves 7 and a hydraulic oil pump (not shown in the figure) connected with the oil pipe 3.

[0042] In the embodiment, referring to Figure 1 and Figure 2 , four hydraulic oil grooves 7 are arranged, which are divided into two groups, each group comprising two hydraulic oil grooves 7 communicated with each other, and the two groups of hydraulic oil grooves 7 are arranged in sequence along the sliding track of the slider 1; the two groups of hydraulic oil grooves 7 are not communicated with each other and are respectively connected with oil pressure gauges 4.

[0043] In the structural static test or structural seismic performance test, the test object is fixedly connected with the hydraulic jack 6, and the hydraulic jack 6 applies axial pressure between the sliding block 1 and the test object. When the test object deforms in the direction perpendicular to the axial pressure, the hydraulic jack 6 and the sliding block 1 slowly slide together with the test object. In this process, the convex strip 51 cooperates with the groove 53, and the limiting block 52 limits the sliding block 1 at both ends of the sliding track of the sliding block 1, which helps to avoid the sliding block 1 from falling off the sliding rail 2.

[0044] The axial pressure applied by the hydraulic jack 6 makes the sliding block 1 and the sliding rail 2 have a tendency to approach and press each other; at the same time, the oil supply assembly supplies oil to the hydraulic oil groove 7, and the pressure of the hydraulic oil makes the sliding block 1 and the sliding rail 2 have a tendency to move away from each other; in this way, the oil pressure in the hydraulic oil groove 7 and the external axial pressure offset each other, so that the pressure between the sliding block 1 and the sliding rail 2 is reduced, thereby reducing the friction between the sliding block 1 and the sliding rail 2.

[0045] The oil pressure gauge 4 displays the oil pressure in the hydraulic oil groove 7, which facilitates the adjustment of the oil pressure in the hydraulic oil groove 7 according to the change of the external axial pressure, so as to realize the effect of reducing the friction. By arranging multiple groups of hydraulic oil grooves 7, the pressure applied by the hydraulic jack 6 to the sliding block 1 is uniformly transmitted to the sliding rail 2, which is conducive to the stable sliding of the sliding block 1.

[0046] Referring to Figure 4 , the gap between the sliding block 1 and the sliding rail 2 is communicated with the hydraulic oil groove 7, and the hydraulic oil groove 7 is provided with a sealing element. Specifically, the sealing element is a hydraulic oil seal 8 arranged in the hydraulic oil groove 7, which is made of elastic material, such as rubber, silicone, polyurethane, polytetrafluoroethylene, etc.

[0047] Referring to Figure 5 , the hydraulic oil seal 8 includes a circular planar portion 81 and an annular portion 82 fixedly connected to the circumferential side of the planar portion 81, and the annular portion 82 is used to seal the gap between the sliding block 1 and the sliding rail 2; the planar portion 81 is provided with a plurality of circular through holes 811.

[0048] Referring to Figure 4 and Figure 5 , the width of the annular portion 82 along the axial direction of the hydraulic oil seal 8 is greater than the thickness of the planar portion 81, and the annular portion 82 is provided with a side abutting surface 821 and a top abutting surface 822, the side abutting surface 821 abuts against the inner side wall of the hydraulic oil groove 7, and the top abutting surface 822 abuts against the bottom surface of the sliding rail 2.

[0049] When the hydraulic jack 6 applies axial pressure, the top abutting surface 822 of the hydraulic oil seal 8 abuts against the bottom surface of the slide rail 2, and the pressure of the hydraulic oil in the hydraulic oil groove 7 pushes the hydraulic oil seal 8 towards the slide rail 2; at the same time, the hydraulic oil penetrates outward along the gap between the side abutting surface 821 and the inner wall of the hydraulic oil groove 7, and the hydraulic oil penetrates into the gap between the sliding block 1 and the slide rail 2 to form an oil film; when the oil pressure between the sliding block 1 and the slide rail 2 is balanced with the external atmospheric pressure, the hydraulic oil stops penetrating.

[0050] Due to the mutual offsetting of the pressure of the hydraulic oil in the hydraulic oil groove 7 and the external axial pressure, the pressure between the sliding block 1 and the slide rail 2 is reduced; further, the oil film between the sliding block 1 and the slide rail 2 reduces the friction coefficient therebetween, so that the friction between the sliding block 1 and the slide rail 2 can be ignored, and the friction force acting on the sliding block 1 when it slides is only the sliding friction force between the top abutting surface 822 of the hydraulic oil seal 8 and the bottom surface of the slide rail 2.

[0051] At the same time, the oil pressure in the hydraulic oil groove 7 can transmit most of the external axial pressure, and the axial pressure transmitted between the sliding block 1 and the slide rail 2 through the hydraulic oil seal 8 accounts for a very small proportion, which is the ratio of the area of the top abutting surface 822 of the hydraulic oil seal 8 to the area of the inner bottom surface of the hydraulic oil groove 7.

[0052] Therefore, the calculation formula of the sliding friction force F acting on the sliding block 1 is as follows:

[0053]

[0054] In the formula, μ is the friction coefficient between the oil seal and the slide rail 2 under the condition of oil film lubrication, N is the external axial pressure applied by the hydraulic jack 6, A0 is the area of the inner bottom surface of the hydraulic oil groove 7, and A1 is the area of the top abutting surface 822 of the hydraulic oil seal 8.

[0055] In this way, the sliding friction force of the support can be directly calculated when the sizes of the components such as the hydraulic oil groove 7 and the hydraulic oil seal 8 are known, which is beneficial to improve the accuracy of the test results and facilitate the development of various structural static tests or seismic performance tests requiring bidirectional load application.

[0056] The implementation principle of the low-friction hydraulic sliding support capable of bearing axial force in the embodiment of the application is that the hydraulic jack 6 applies axial pressure between the sliding block 1 and the test object, and at the same time, the oil supply assembly supplies oil into the hydraulic oil groove 7, the pressure of the hydraulic oil in the hydraulic oil groove 7 and the external axial pressure are mutually offset, and the pressure between the sliding block 1 and the slide rail 2 is reduced.

[0057] The oil pressure in the hydraulic oil groove 7 pushes the hydraulic oil seal 8 towards the slide rail 2, and at the same time, the hydraulic oil penetrates outward through the gap between the side abutting surface 821 and the inner side wall of the hydraulic oil groove 7, and the hydraulic oil penetrates into the gap between the slide block 1 and the slide rail 2 to form an oil film, thereby reducing the friction between the slide block 1 and the slide rail 2; when the oil pressure between the slide block 1 and the slide rail 2 is balanced with the external atmospheric pressure, the hydraulic oil stops penetrating.

[0058] Therefore, in the case of a large external axial pressure, the frictional force received by the slide block 1 during sliding can be small, so that the application can withstand a large external axial pressure. Further, the frictional force received by the slide block 1 during sliding can be calculated, which is beneficial to improve the accuracy of test results and facilitate the development of various structural static tests or seismic performance tests that require bidirectional loading.

[0059] The above are preferred embodiments of the application, and are not intended to limit the protection scope of the application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A low-friction hydraulic sliding support capable of withstanding axial forces, characterized by: include: Slide rails; A slider is slidably disposed on the slide rail, a hydraulic jack for applying axial pressure to the test object being fixedly disposed on a side of the slider away from the slide rail; a hydraulic oil tank is provided on a side of the slider close to the slide rail, and an oil supply assembly for supplying oil to the hydraulic oil tank is connected to the hydraulic oil tank; The cam is secured to the hydraulic oil tank with an axial thrust that engages the hydraulic oil tank, and the cam is secured to the hydraulic oil tank with an axial thrust that engages the hydraulic oil tank.

2. A low-friction hydraulic sliding support capable of withstanding axial forces according to claim 1, characterized in that: The slider is provided with a sliding groove adapted to slide with the slide rail, the hydraulic oil groove is provided on the inner bottom wall of the sliding groove, and the gap between the slider and the slide rail is communicated with the hydraulic oil groove.

3. The low-friction hydraulic sliding support capable of bearing axial forces according to claim 2, characterized in that: Both sides of the slide rail are fixedly provided with convex strips, and the convex strips extend along the sliding track of the slider. The slider is provided with a groove on the inner side wall of the slide groove, which is adapted to slide with the convex strips.

4. The low-friction hydraulic sliding support capable of bearing axial forces according to claim 3, characterized in that: The slide rail is fixed with limit blocks at both ends of the convex strip, which are used to limit the sliding of the slider.

5. The low-friction hydraulic sliding support capable of bearing axial forces according to claim 1, characterized in that: The hydraulic oil seal is made of elastic material.

6. The low-friction hydraulic sliding support capable of bearing axial forces according to claim 1, characterized in that: The calculation formula of the sliding friction force F when the slider slides is as follows: Wherein: μ is the friction coefficient between the oil seal and the slide rail under oil film lubrication conditions, N is the external axial pressure applied by the hydraulic jack, A0 is the area of ​​the bottom surface of the hydraulic oil tank, and A1 is the area of ​​the top abutting surface of the hydraulic oil seal.

7. The low-friction hydraulic sliding support capable of bearing axial forces according to claim 1, characterized in that: At least two groups of the hydraulic oil tanks are provided, and the multiple groups of the hydraulic oil tanks are arranged in sequence along the sliding track of the slider.

8. The low-friction hydraulic sliding support capable of bearing axial forces according to claim 7, characterized in that: Each group of hydraulic oil tanks is connected to an oil pressure gauge.

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