A kind of experimental actuator shock absorbing device

Abstract

The present invention belongs to the field of shock-absorbing connection technology, and specifically relates to a shock-absorbing device for test actuators. The device includes: an outer shell, a prestressed steel strand, a cover plate, a rubber particle material, a long screw, a long nut and a long nut; the cylindrical barrel structure outer shell can effectively restrict the overflow of the internal rubber particle material; the cover plates are installed at the openings at both ends of the outer shell, and the central area of ​​the cover plate is processed with a through hole, and the long screws welded at both ends of the prestressed steel strand pass through the through hole and are anchored on the cover plate through the long nut; when multiple shock-absorbing units are used in series, bolts are used to pass through the bolt holes processed in the edge areas of two adjacent cover plates to form a cover plate assembly; the long screws at the lower ends of two adjacent prestressed steel strands are connected in series through a long nut; the device relies on the elastic hysteresis performance of the rubber particle material, and applies a pre-tightening force through the prestressed steel strand to increase the friction between the particles, thereby dissipating energy and playing a shock-absorbing role; the detachable connection method facilitates the replacement of materials and reduces costs.

Description

Technical Field

[0001] The invention belongs to the technical field of shock-absorbing connections, and in particular relates to a shock-absorbing device for an actuator used in a test. Background Art

[0002] Shock-absorbing devices are commonly used in engineering practice, which can effectively reduce the damage caused by vibration to engineering devices. With the development of test technology, the requirements for test accuracy are getting higher and higher, and the requirements for vibration control at some joints are also getting higher and higher, and the scope of use of shock-absorbing devices is also getting wider and wider.

[0003] In existing tests, when using an actuator to apply horizontal or vertical reciprocating loads to the test component, the effect of the tiny vibration of the cylinder body on the load value of the actuator when the actuator is extended or contracted is often ignored. At the same time, the commonly used seismic isolation device is composed of rubber and laminated steel plates. Since the vibration load during operation causes irreversible plastic deformation of the steel plate, this device needs to be replaced after a certain period of use, resulting in huge material waste. Summary of the invention

[0004] In view of this, the present invention provides a shock absorbing device for an actuator used in a test, wherein the rubber particle material filled in the device has excellent energy dissipation capacity in the elastic stage, and can effectively solve the problem of vibration affecting the test accuracy.

[0005] The present invention is achieved through the following technical solutions:

[0006] A test actuator shock absorbing device, the device comprising more than one shock absorbing unit, each shock absorbing unit having the same structure, including: a shell, a cover plate, and a prestressed steel strand;

[0007] The shell is a cylindrical structure with openings at both ends, and cover plates are respectively installed at the openings at the upper and lower ends of the shell, and the cover plates are processed with evenly distributed through holes; the inside of the shell is filled with rubber granular material;

[0008] More than one prestressed steel strand is installed in the shell, prestress is applied to the steel strand, and two ends of the prestressed steel strand are detachably fixedly installed between the through holes corresponding to the two end cover plates.

[0009] Furthermore, long screws are fixedly connected at both ends of the prestressed steel strand, wherein the long screw at one end passes through a through hole processed on one end cover plate and is anchored to the cover plate through a long nut; after the long screw at the other end passes through a through hole processed on another cover plate, prestress is first applied to the prestressed steel strand, and then the long screw is anchored to the other cover plate through a long nut.

[0010] Furthermore, two ends of the prestressed steel strand are respectively welded to two long screws.

[0011] Furthermore, when the device includes more than two damping units, the damping units are connected in series in the following manner:

[0012] The base of the cover plates at both ends of the shock absorbing unit is a disc structure, and a coaxial circular column plate is processed at the center of the base, and the circular column plate and the housing hole axis are matched; on the cover plate base, evenly distributed through holes are processed in the circular column plate area, and evenly distributed bolt holes are processed outside the circular column plate area;

[0013] Any two adjacent damping units are defined as a first damping unit and a second damping unit, the disc base of a cover plate at one end of the second damping unit is completely fitted with the disc base of a cover plate at one end of the first damping unit, the bolt holes and through holes on the two fitted cover plates are positioned correspondingly, the bolts are matched with the bolt holes on the two fitted cover plates, and the two cover plates are fixedly connected to form a first cover plate assembly;

[0014] The long screw connected to the end of the prestressed steel strand of the first shock-absorbing unit passes through the through hole on the first cover plate assembly and is anchored on the cover plate by a long nut; the long screw welded to the end of the prestressed steel strand of the second shock-absorbing unit is connected to the part of the long screw connected to the prestressed steel strand of the first shock-absorbing unit that extends out of the long nut through a long nut with openings at both ends and internal threads, thereby realizing the series connection of the two prestressed steel strands.

[0015] Furthermore, the shell of the shock absorbing unit is made of hydrogenated nitrile rubber, and the cover plate is made of steel.

[0016] Furthermore, when the device includes more than two damping units, the steps of the installation method are as follows:

[0017] (1) Remove the long nut at one end of the first damping unit, pass the long screw at one end of the prestressed steel strand of the first damping unit through the through hole on the first cover assembly, and then anchor the long screw extending out of the cover assembly to the first cover assembly through the long nut;

[0018] (2) Using a long nut with openings at both ends and internal threads, the portion of the long screw connected to the end of the first damping unit extending out of the long nut is threadedly connected to the long screw at the end of the second damping unit, so that the prestressed steel strand of the second damping unit is connected in series with the prestressed steel strand of the first damping unit;

[0019] (3) installing the opening at one end of the shell of the second damping unit on the first cover assembly, and filling the inside of the shell of the second damping unit with rubber granules;

[0020] (4) The cover plate at the other end of the second shock absorbing unit is fixedly connected to the cover plate at one end of the adjacent shock absorbing unit by bolts to form a second cover plate assembly; the second cover plate assembly is installed at the opening at the other end of the shell of the second shock absorbing unit; the long screw connected to the other end of the prestressed steel strand of the second shock absorbing unit passes through the through hole processed on the second cover plate assembly to apply prestress to the prestressed steel strand of the second shock absorbing unit, and then is anchored to the second cover plate assembly by a long nut.

[0021] Beneficial effects:

[0022] (1) The present invention provides a shock-absorbing device for a test actuator. The rubber particle material filled in the shell of the device has excellent energy dissipation performance due to its elastic hysteresis performance within its material elastic range. When the aggregate composed of the rubber particle material is subjected to external disturbance, the friction between the particles can also dissipate energy. At the same time, the pre-tightening force applied by the prestressed steel strand to the device will also increase the friction between the particles, improve the energy dissipation capacity of the particle material, and thus achieve a shock-absorbing effect. The cover plates at both ends of the device adopt a simple and detachable connection method, which is convenient for replacing the internal particle material and has a high reuse rate. It can be used alone or in series according to different scenario requirements. It can be widely used to solve the vibration problem of the test actuator and the beam-column node of the reinforced concrete frame structure.

[0023] (2) The present invention provides a shock-absorbing device for an actuator used in an experiment, wherein long screws are welded at both ends of the prestressed steel strands of the device, and the long screws pass through the through holes processed on the cover plates, and are threadedly connected to the long screws extending out of the cover plates using long nuts, so that the cover plates at both ends can be detachably fixed to the outer shell; a long nut with openings at both ends and processed with internal threads is used to thread the part of the long screw connected to the end of the first shock-absorbing unit that extends out of the long nut and the long screw at the end of the second shock-absorbing unit, so that the two prestressed steel strands are connected in series, which is convenient for modular installation.

[0024] (3) The present invention provides a shock absorbing device for an experimental actuator, wherein the outer shell is made of hydrogenated nitrile rubber, which is relatively cheap and easy to replace, thus reducing the manufacturing cost of the device; the cover plate of the device is made of steel, which is low in cost, strong and wear-resistant, and can be reused.

[0025] (4) The present invention provides a method for serial installation of a shock absorbing device for an experimental actuator, wherein the method completely fits the disc bottoms of two adjacent cover plates of two adjacent shock absorbing units, positions of through holes and bolt holes correspond to each other, and are fixedly connected by bolts to form a cover plate assembly; the annular column plate of the cover plate assembly facilitates serial installation of the housing; compared to directly connecting two completed separate shock absorbing devices in series, the method of first connecting the cover plates of two adjacent shock absorbing units to form a cover plate assembly and then connecting the steel strands in series and installing the housing can avoid the formation of gaps between the connected cover plates and avoid the shear deformation of the prestressed steel strand screw rod that is not conducive to disassembly, thereby improving the shock absorbing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the decomposition of the shock absorbing unit structure of the present invention;

[0027] Figure 2 Schematic diagram of the connection between the prestressed steel strand and the long screw (a) and the enlarged schematic diagram of the long screw (b);

[0028] Figure 3 yes Figure 1 Schematic diagram of the middle and lower cover;

[0029] Figure 4 It is a schematic diagram of the series structure of the shock absorbing units of the present invention;

[0030] Figure 5 yes Figure 3 A schematic diagram of the installation of the cover assembly of the first damping unit;

[0031] Among them, 1-shell, 2-lower cover, 3-upper cover, 4-prestressed steel strand, 5-long screw A, 6-long screw B, 7-long nut A, 8-long nut B, 9-bolt, 10-lower cover of the second shock-absorbing unit, 11-first cover assembly, 12-shell of the second shock-absorbing unit, 13-second cover assembly, 14-upper cover of the second shock-absorbing unit, 15-lower cover of shock-absorbing unit A, 16-long nut C, 17-third cover assembly, 18-lower cover of shock-absorbing unit B. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example 1

[0034] This embodiment provides a test actuator damping device, the device includes a damping unit, the structure of the damping unit is as follows: Figure 1 As shown, it includes: a housing 1, a lower cover plate 2 and an upper cover plate 3,

[0035] The housing 1 is a cylindrical structure with openings at both ends, and an upper cover plate 3 and a lower cover plate 2 are respectively installed at the openings at the upper and lower ends of the housing; Figure 3 As shown, the base of the lower cover plate 2 is a disc structure, and a coaxial circular column plate is processed at the center of the base, and the circular column plate and the housing 1 are matched with each other; on the base of the lower cover plate 2, evenly distributed through holes are processed in the circular column plate area, and evenly distributed bolt holes are processed outside the circular column plate area; the structure and size of the upper cover plate 3 and the lower cover plate 2 are exactly the same; the interior of the housing 1 is filled with sand-like rubber granular material;

[0036] More than one prestressed steel strand 4 is installed in the device housing 1. Figure 2 As shown, the upper and lower ends of the prestressed steel strand 4 are respectively welded with a long screw A5 and a long screw B6, the long screw B6 passes through the through hole processed on the lower cover plate 2, and is anchored on the lower cover plate 2 through a long nut B8; after the long screw A5 passes through the through hole processed on the upper cover plate 3, prestress is first applied to the prestressed steel strand 4, and then it is anchored on the upper cover plate 2 through a long nut A7.

[0037] Example 2

[0038] This embodiment provides a test actuator damping device based on the embodiment 1. Figures 4-5 As shown, the device comprises two damping units connected in series;

[0039] The damping unit described in the embodiment 1 located at the bottom is the first damping unit, and the damping unit connected to the upper end of the first damping unit is the second damping unit; the disc base of the lower cover plate 10 of the second damping unit is completely fitted with the disc base of the upper cover plate 3 of the first damping unit, the bolt holes and the through holes are respectively corresponding, and the bolts 9 pass through the bolt holes to fix the lower cover plate 10 of the second damping unit and the upper cover plate 3 of the first damping unit to form a first cover plate assembly 11;

[0040] The long screw rod A5 connected to the upper end of the prestressed steel strand of the first shock absorbing unit passes through the through hole on the first cover plate assembly 11, and the long nut A7 moves downward along the thread on the long screw rod A7 and is fixed on the first cover plate assembly 11; the long screw rod C connected to the lower end of the prestressed steel strand of the second shock absorbing unit is connected to the upper end of the long screw rod A5 welded to the prestressed steel strand of the first shock absorbing unit through a long nut A with openings at both ends and a threaded structure processed inside;

[0041] The lower opening of the housing 12 of the second shock absorbing unit is mounted on the annular column plate at the base of the first cover plate assembly 11; the housing 12 of the second shock absorbing unit is filled with energy-absorbing sand-like rubber granular material; the upper cover plate 14 of the second shock absorbing unit and the lower cover plate 15 of the adjacent shock absorbing unit A are fixedly connected by bolts to form a second cover plate assembly 13; the second cover plate assembly 13 is mounted at the upper opening of the housing 12 of the second shock absorbing unit; the long screw D connected to the upper end of the second prestressed steel strand passes through the through hole processed on the second cover plate assembly 13, applies prestress to the second prestressed steel strand, and is anchored on the second cover plate assembly 13 through the long nut C16;

[0042] The lower cover plate 2 of the first shock absorbing unit and the upper cover plate 18 of the adjacent shock absorbing unit B are fixedly connected by bolts to form a third cover plate assembly 17; the long screw rod B6 connected to the lower end of the steel strand of the first shock absorbing unit passes through the through hole on the third cover plate assembly 17 and is fixed to the third cover plate assembly 17 by a long nut B8.

[0043] Example 3

[0044] Based on Example 2, this embodiment provides an installation method for an actuator damping device including two or more damping units connected in series, including the following steps:

[0045] (1) Remove the long nut A7 on the upper end of the first damping unit, pass the long screw A5 welded on the upper end of the prestressed steel strand of the first damping unit through the through hole on the first cover plate assembly 11, and then thread the long screw A5 extending out of the cover plate assembly and the long nut A7 to be fixedly connected;

[0046] (2) Through a long nut A with openings at both ends and a threaded structure processed inside, the long screw C welded at the lower end of the prestressed steel strand of the second shock-absorbing unit and the long screw A5 welded at the upper end of the prestressed steel strand of the first shock-absorbing unit, which extends out of the long nut A6, are threadedly connected to realize the series connection of the two prestressed steel strands;

[0047] (3) The housing 12 of the second damping unit is mounted on the first cover assembly 11, and the housing and the circular cylindrical plate hole on the base of the first cover assembly are axially matched; the interior of the housing 12 of the second damping unit is filled with energy-absorbing sand-like rubber granular material;

[0048] (4) The long screw D welded on the upper end of the prestressed steel strand of the second damping unit passes through the through hole processed on the second cover plate assembly 13 to apply prestress to the prestressed steel strand of the second damping unit, and then is anchored on the second cover plate assembly 13 through the long nut C16;

[0049] Similarly, when it is necessary to connect a shock-absorbing unit in series below the first shock-absorbing unit, the long nut B8 at the lower end of the prestressed steel strand of the first shock-absorbing unit is removed, and the long screw rod B6 at the lower end of the prestressed steel strand of the first shock-absorbing unit is passed through the through hole on the third cover plate assembly 17, and then anchored on the third cover plate assembly 17 through the long nut B8, and then the long nut B is used to connect the long screw rod B6 welded at the lower end of the prestressed steel strand of the first shock-absorbing unit, the screw rod extending out of the long nut B8 and the long screw rod at the upper end of the prestressed steel strand of the adjacent shock-absorbing unit B below, and so on.

[0050] Working principle:

[0051] The end of the actuator shock absorbing device used in the test of the present invention is connected to the actuator through a tooling, and the device can be used alone or in series according to the requirements of the use scenario;

[0052] When the device is used alone, it only needs to be connected to the test actuator through a tooling; the rubber particle material filled in the device shell has excellent energy dissipation performance within its material elastic range due to its elastic hysteresis performance; when the aggregate composed of the rubber particle material is subjected to external disturbance, the friction between the particles can dissipate energy; at the same time, the pre-tightening force applied by the prestressed steel strand to the device can also increase the friction between the particles and improve the energy dissipation capacity of the particle material; thereby effectively overcoming the influence of vibration on the test accuracy.

[0053] When multiple devices are used in series, first, the disc bases of the upper and lower cover plates of adjacent shock-absorbing units are completely fitted together, the positions of the bolt holes and the through holes are respectively corresponding, and the bolts are passed through the bolt holes to fix the cover plates of the adjacent shock-absorbing units to form a cover plate assembly; the outer diameter of the circular ring column plate on the base of the upper and lower cover plate assemblies matches the inner diameter of the shell, which is used to install the shell of the series device; long screws are welded at both ends of the prestressed steel strands, and the long screws pass through the through holes on the cover plate assembly and are anchored to the cover plate through long nuts; the long screws welded at the ends of two adjacent prestressed steel strands are threadedly connected through long nuts with openings at both ends and processed with internal threads to realize the series connection of the two prestressed steel strands; after the shell is filled with sand-like rubber granular material, prestress is first applied to the prestressed steel strands in series, and then the long screws welded at the ends of the prestressed steel strands are fixed to the next cover plate assembly through long nuts;

[0054] Compared with directly connecting two assembled shock-absorbing units in series, the series installation method has significantly improved shock-absorbing effect. Because long nuts are anchored on the cover plates of the assembled shock-absorbing units, direct series connection will result in a gap between the two shock-absorbing units, and the installation process is also likely to cause shear deformation of the screws at both ends of the prestressed steel strands in series, thereby affecting the shock-absorbing effect and the life of the device; the installation method makes the cover plates of two adjacent shock-absorbing units fit completely through the design of the cover plate assembly, and will not cause shear deformation of the screws at both ends of the prestressed steel strands in series during the installation process, and improves the shock-absorbing effect and the service life of the device; the upper and lower cover plate assemblies and the outer shell are connected and fixed by the long screws at both ends of the steel strands and the long nuts threadedly connected to the long screws. The connection method is simple and convenient for disassembly and replacement of internal granular materials.

[0055] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A test actuator damping device, characterized in that: The device comprises more than one shock absorbing unit, and each shock absorbing unit has the same structure, including: a shell, a cover plate, and a prestressed steel strand; The shell is a cylindrical structure with openings at both ends, and cover plates are respectively installed at the openings at the upper and lower ends of the shell, and the cover plates are processed with evenly distributed through holes; the inside of the shell is filled with rubber granular material; One or more prestressed steel strands are installed in the housing, prestress is applied to the steel strands, and the two ends of the prestressed steel strands are detachably fixed between the through holes corresponding to the two end covers; The two ends of the prestressed steel strand are fixedly connected with long screws, wherein the long screw at one end passes through a through hole processed on one end cover plate and is anchored on the cover plate through a long nut; after the long screw at the other end passes through a through hole processed on the other cover plate, prestress is first applied to the prestressed steel strand, and then anchored on the other cover plate through the long nut; When the device comprises more than two damping units, the damping units are connected in series in the following manner: The base of the cover plates at both ends of the shock absorbing unit is a disc structure, and a coaxial circular column plate is processed at the center of the base, and the circular column plate and the housing hole axis are matched; on the cover plate base, evenly distributed through holes are processed in the circular column plate area, and evenly distributed bolt holes are processed outside the circular column plate area; Any two adjacent damping units are defined as a first damping unit and a second damping unit, the disc base of a cover plate at one end of the second damping unit is completely fitted with the disc base of a cover plate at one end of the first damping unit, the bolt holes and through holes on the two fitted cover plates are positioned correspondingly, the bolts are matched with the bolt holes on the two fitted cover plates, and the two cover plates are fixedly connected to form a first cover plate assembly; The long screw connected to the end of the prestressed steel strand of the first shock-absorbing unit passes through the through hole on the first cover plate assembly and is anchored on the cover plate by a long nut; the long screw welded to the end of the prestressed steel strand of the second shock-absorbing unit is connected to the part of the long screw connected to the prestressed steel strand of the first shock-absorbing unit that extends out of the long nut through a long nut with openings at both ends and internal threads, thereby realizing the series connection of the two prestressed steel strands.

2. A test actuator damping device according to claim 1, characterized in that: The two ends of the prestressed steel strand are respectively welded to two long screws.

3. A test actuator damping device according to claim 1 or 2, characterized in that: The shell of the shock absorbing unit is made of hydrogenated nitrile rubber, and the cover plate is made of steel.

4. The test actuator damping device according to claim 1, characterized in that: When the device includes more than two damping units, the steps of the installation method are as follows: (1) Remove the long nut at one end of the first damping unit, pass the long screw at one end of the prestressed steel strand of the first damping unit through the through hole on the first cover assembly, and then anchor the long screw extending out of the cover assembly to the first cover assembly through the long nut; (2) Using a long nut with openings at both ends and internal threads, the portion of the long screw connected to the end of the first damping unit extending out of the long nut is threadedly connected to the long screw at the end of the second damping unit, so that the prestressed steel strand of the second damping unit is connected in series with the prestressed steel strand of the first damping unit; (3) installing the opening at one end of the shell of the second damping unit on the first cover assembly, and filling the inside of the shell of the second damping unit with rubber granules; (4) The cover plate at the other end of the second shock absorbing unit is fixedly connected to the cover plate at one end of the adjacent shock absorbing unit by bolts to form a second cover plate assembly; the second cover plate assembly is installed at the opening at the other end of the shell of the second shock absorbing unit; the long screw connected to the other end of the prestressed steel strand of the second shock absorbing unit passes through the through hole processed on the second cover plate assembly to apply prestress to the prestressed steel strand of the second shock absorbing unit, and then is anchored to the second cover plate assembly by a long nut.

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