Variable damping stress release support based on magneto-rheology

Abstract

The utility model relates to a variable damping stress release support based on magneto-rheology. Comprising a ball support base plate, a base dowel bar, a vertical permanent magnet, a variable damping support outer cylinder, a magnetic flow elastomer damping layer, a coil shaped like a Chinese character'mi ', a permanent magnet fixing groove, a spherical inner cylinder, a support, an anisotropic ball outer cylinder, a wiring trough, a permanent magnet angle steel support, a coil iron core, a base plate permanent magnet, a coil fixing shaft, a coil fixing shaft hole, a magnetic conductive sheet box and a magnetorheological elastomer. The magnetic field intensity in the coil is changed through the change of the current, the overall rigidity and damping of the magnetorheological elastomer are influenced, and vertical, left-right and large-angle rotation of the whole support is achieved. Current is introduced into the electromagnetic coil, so that the coil generates a magnetic field, and the intensity of the magnetic field is adjusted by controlling the magnitude of the current, so that the instantaneous shift is reduced by changing the rigidity of the magnetorheological elastomer.

Description

Technical Field

[0001] The utility model relates to the technical field of node design of steel structures, in particular to the connection technology of steel structures, and specifically is a magnetorheological variable damping stress release support. Background Art

[0002] In the field of large-scale construction, steel structures are widely used because of their light weight and easy construction. However, steel is relatively sensitive to temperature and the randomness of earthquake effects make steel structures a huge threat during construction.

[0003] After investigation, it was found that the best way to release temperature stress is to set an articulated support at the end of the steel structure. Traditional articulated supports mainly achieve temperature stress release through node balls and node cavities (or rubber pads), but the rotation process will cause the node to generate a lot of heat, thereby affecting the temperature stress release of the node and the service life of the node.

[0004] In addition, a large earthquake will cause great harm to people's lives. Although the use of existing hinged supports improves the overall torsion resistance of the structure and reduces the deformation of the structure, the horizontal force and seismic force generated by them on the vertical structure cannot be ignored. Therefore, a steel structure node hinge structure that can release temperature stress and achieve vibration isolation is studied to meet the needs. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned defects and propose a variable damping bearing based on magnetorheological fluid, which can move up and down, left and right, and thus achieve large-angle movement; effectively solve the problem of structural damage caused by instantaneous movement of the bearing, reduce injuries to personnel caused by damaged buildings, and at the same time solve the problem of rubber bearings reducing bearing durability due to friction.

[0006] In order to achieve the above object, the utility model has the following specific contents:

[0007] A magnetorheological variable damping stress release bearing, comprising a ball bearing base plate (1), a base force transmission rod (2), a vertical permanent magnet (3), a variable damping bearing outer cylinder (4), a magnetorheological elastic body damping layer (5), a cross-shaped coil (6), a permanent magnet fixing groove (7), a spherical inner cylinder (8), a bracket (9), an anisotropic spherical outer cylinder (10), a wire groove (11), a permanent magnet angle steel bracket (12), a coil core (13), a base plate permanent magnet (14), a coil fixing shaft (15), a coil fixing shaft hole (16), a magnetic conductive sheet box (17), A magnetorheological elastomer (18); a variable damping support outer cylinder (4) is welded to a heterogeneous spherical outer cylinder (10), and the wall thicknesses of the two are kept consistent; a base force transmission rod (2) is connected to an upper node, and its lower part is connected to a spherical inner cylinder (8); a cross-shaped coil (6) is arranged inside the spherical inner cylinder (8); a permanent magnet fixing groove (7) is arranged at the bottom and upper part of the variable damping support outer cylinder (4); a coil is also arranged at the bottom of the variable damping support outer cylinder (4), a coil core (13) is arranged in the middle of the coil, and a bottom plate permanent magnet (13) is arranged on the upper part of the coil core (13). 4); the vertical coil in the cross-shaped coil (6) in the spherical inner cylinder (8) is ensured to be in the same position; the variable damping support outer cylinder (4) is also provided with a bracket (9) for fixing the vertical permanent magnet (3); permanent magnets are arranged in four directions of the variable damping support outer cylinder (4); the permanent magnets corresponding to each other are all of opposite poles; a coil fixing shaft (15) is arranged at the bottom of the variable damping support outer cylinder (4) and penetrates into the spherical inner cylinder (8) to ensure that the position of the coil remains unchanged during the rotation of the ball; the coil fixing shaft (15) passes through the circular hole reserved in the spherical inner cylinder (8) The hole is a coil fixing shaft hole (16), and the size of the coil fixing shaft hole (16) satisfies the maximum displacement required for the rotation of the spherical support. The M-shaped coils (6) are all placed in the magnetic conductive sheet box (17), and the coils are connected to the magnetic conductive sheet box. There is a gap between the magnetic conductive sheet box (17) and the spherical inner cylinder (8) to ensure the rotation of the spherical inner cylinder (8). There is a gap between the spherical inner cylinder (8) and the heterogeneous spherical outer cylinder (10), and a magnetorheological elastomer damping layer (5) is added in the gap. A connecting wire channel is set inside the spherical inner cylinder (8), the base force transmission rod (2), and the support ball.

[0008] In the magnetorheological variable damping stress release support, a cross-shaped coil (6) is arranged inside the spherical inner cylinder (8); that is, the orthogonal coils in three directions have magnetic poles opposite to those of the corresponding permanent magnets outside.

[0009] In the magnetorheological variable damping stress release support, the anisotropic spherical outer cylinder (10) is formed by combining a circular shape and an elliptical shape, and the side projection of the elliptical sphere is a cylinder, so that the upper and lower movable distances are more in line with the maximum displacement design requirements generated during an earthquake.

[0010] In the magnetorheological variable damping stress release support, the gap between the magnetic conductive sheet box (17) and the spherical inner cylinder (8) is less than 1 cm.

[0011] The magnetorheological variable damping stress release support is characterized in that the magnetorheological elastomer damping layer (5) comprises a magnetic conductive sheet and a magnetorheological elastomer (18), and magnetic conductive sheets are arranged outside the two magnetorheological elastomers (18); the magnetic conductive sheets are respectively connected to the spherical inner cylinder (8) and the heterogeneous spherical outer cylinder (10); the magnetic conductive sheet box (17) is in a groove shape, and the thickness of the magnetorheological elastomer (18) is greater than the height of the magnetic conductive sheet box.

[0012] Compared with the prior art, the utility model passes current through the wire coil to make the coil generate a magnetic field, controls the size of the current and thus changes the magnetic field strength, thereby affecting the stiffness of the magnetorheological elastomer and further reducing the transient displacement through friction; its principle is that the damping stiffness of the magnetorheological elastomer damping layer is very large under the action of the permanent magnet, and under the action of friction, the support slip is small, thereby resisting the horizontal shear force, and in addition, the stress condition of the rod can be determined through the stress and strain detection of the truss structure. When the change exceeds a certain limit, the processor system calculates the variable displacement and controls the shear damping size, thereby effectively preventing structural transients.

[0013] Furthermore, the rotatable variable damping stress release support in the utility model mainly utilizes magnetorheological fluid and a special variable damper outer cylinder to realize the variable damping support that enables the damper to slide up and down, slide left and right, and rotate at a large angle.

[0014] Furthermore, since magnetorheological elastomers and magnetorheological fluid dampers are provided on the buffer sliding bearings, the displacement change of the bearings in the horizontal direction is affected by the stiffness change of the magnetorheological elastomers during temperature changes or earthquakes, thereby effectively preventing damage to the bearing structure caused by instantaneous horizontal displacement or large displacement. At the same time, compared with fixed bearings, the damping of the sliding bearings can be adjusted according to the stress, thereby reducing the reinforcement and damage effects of the main structural components and reducing the project cost.

[0015] Furthermore, since bolt holes for fixing the outer groove of the support are arranged around the outer groove of the limited displacement buffer sliding support, the installation of the support becomes very quick, simple, accurate and efficient.

[0016] Furthermore, in the entire assembly process of the utility model, except for the connection between the lower support of the beam and the beam, local welding work can be completed in the factory, and no welding is required on site. Anchor bolts can be used for connection, which is convenient for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is an overall schematic diagram of a support according to the present invention.

[0018] Figure 2 It is a schematic diagram of the support cylinder body of the present invention.

[0019] Figure 3 It is a schematic diagram of the M-shaped coil of the present invention.

[0020] Figure 4 It is a schematic diagram of the vertical permanent magnet arrangement of the present invention.

[0021] Figure 5 It is a schematic diagram of the coil wire connection of the present invention.

[0022] Figure 6 It is a schematic diagram of the permanent magnet angle steel bracket of the present invention.

[0023] Figure 7 Schematic diagram of the coil of the present invention.

[0024] Figure 8 This is a diagram showing the arrangement of the magnetorheological fluid of the present invention.

[0025] Among them, 1-ball bearing base plate, 2-base force transmission rod, 3-vertical permanent magnet, 4-variable damping bearing outer cylinder, 5-magnetorheological elastomer damping layer, 6-M-shaped coil, 7-permanent magnet fixing groove, 8-spherical inner cylinder, 9-bracket, 10-special-shaped ball outer cylinder, 11-wire groove, 12-permanent magnet angle steel bracket, 13-coil core, 14-bottom plate permanent magnet, 15-coil fixing shaft, 16-coil fixing shaft hole, 17-magnetic conductive sheet box, 18-magnetorheological elastomer. DETAILED DESCRIPTION

[0026] The present invention is further described below through specific embodiments.

[0027] like Figures 1 to 8 A magnetorheological variable damping stress release bearing includes a ball bearing base plate, a base force transmission rod, a vertical permanent magnet, a variable damper, a magnetorheological elastomer damping layer, a coil, etc. Because the magnetorheological elastomer has very large stiffness and damping under the action of the permanent magnet, the change of current causes the magnetic field intensity in the coil to change, further affecting the overall stiffness and damping of the magnetorheological elastomer, thereby realizing the vertical, left and right and large-angle rotation of the bearing.

[0028] The variable damping support outer cylinder and the heterogeneous ball outer cylinder are connected by split welding, and the wall thickness of the two is ensured to be consistent.

[0029] The base force transmission cylinder is connected to the upper node and the lower part is connected to the spherical inner cylinder.

[0030] The spherical inner cylinder is provided with a cross-shaped coil in three directions, that is, the coils in three directions are orthogonal to each other, and the magnetic poles of the orthogonal coils in three directions are opposite to the magnetic poles of the corresponding permanent magnets outside.

[0031] Permanent magnet fixing grooves are arranged at the bottom and the top of the outer cylinder of the variable damping support. Since the magnetism of the permanent magnet is very strong, it is ensured that the magnet does not deform during operation.

[0032] The outer cylinder of the anisotropic ball is a combination of a circular and an elliptical shape. In order to ensure smoothness during vertical displacement, the ellipsoidal part can be designed as a cylinder. The movable distance up and down is designed according to the maximum displacement generated during an earthquake.

[0033] The outer cylinder of the anisotropic ball is a combination of a circular and an elliptical shape. In order to ensure smoothness during vertical displacement, the ellipsoidal part can be designed as a cylinder. The movable distance up and down is designed according to the maximum displacement generated during an earthquake.

[0034] The bottom of the outer cylinder of the variable damping support is provided with a coil, the middle of the coil is provided with an iron core, and the upper part of the iron core is provided with a bottom plate permanent magnet. The coil provided at the bottom is ensured to be in the same position as the vertical coil in the linear coil in the spherical inner cylinder.

[0035] The outer cylinder of the variable damping support is provided with a bracket for fixing the vertical permanent magnet.

[0036] Permanent magnets are arranged in four directions of the outer cylinder of the variable damping support, and the permanent magnets corresponding to each other are all of different poles.

[0037] The iron core at the bottom of the outer cylinder of the variable damping support is provided with a coil fixing shaft which penetrates into the spherical inner cylinder to ensure that the position of the coil remains unchanged when the ball rotates.

[0038] The coil fixing shaft passes through a circular hole reserved in the spherical inner cylinder, namely, the coil fixing shaft hole, and the hole size satisfies the maximum displacement required for the rotation of the spherical support.

[0039] The M-shaped coils are all placed in the M-shaped magnetic conductive box, and the coils are fixedly connected to the magnetic conductive box. There is a certain gap of less than 1 cm between the magnetic conductive box and the spherical inner cylinder to ensure the rotation of the spherical inner cylinder.

[0040] The diameters of the spherical inner cylinder and the anisotropic spherical outer cylinder ensure a certain distance, and a magnetorheological elastomer damping layer is added between the distances.

[0041] The above-mentioned magnetorheological variable damping stress release support is based on a magnetorheological elastomer damping layer, which is composed of a magnetic conductive sheet and a magnetorheological elastomer, and a magnetic conductive sheet is arranged outside the two magnetorheological elastomer sheets; the magnetic conductive sheets are respectively connected to the spherical inner cylinder and the anisotropic spherical outer cylinder; the magnetic conductive sheet box is arranged in a groove shape, and the thickness of the magnetorheological elastomer is greater than the height of the magnetic conductive sheet box, and the magnetorheological elastomer damping layer is arranged at the bottom corresponding to the magnet and in four directions of the spherical inner cylinder corresponding to the magnet.

[0042] A magnetorheological variable damping stress release bearing has a spherical inner cylinder, a base force transmission rod and a connecting wire channel arranged inside the bearing ball.

[0043] A magnetorheological variable damping stress release support adopts cutaway welding to ensure that each component is reliably connected.

[0044] The above embodiment shows a magnetorheological variable damping stress release support, and the specific manufacturing process is as follows:

[0045] 1. Make the support shell: assemble the permanent magnet, coil and other structures.

[0046] 2. Make a spherical inner cylinder: install the M-shaped coil and shell inside the sphere.

[0047] 3. Organization and assembly.

[0048] It can be seen from the above implementation examples that the utility model passes current through the wire coil to make the coil generate a magnetic field, controls the size of the current and thus changes the magnetic field strength, thereby affecting the stiffness of the magnetorheological elastomer and further reducing the transient displacement through friction; its principle is that the damping stiffness of the magnetorheological elastomer damping layer is very large under the action of the permanent magnet, and under the action of friction, the support slip is small, thereby resisting the horizontal shear force, and in addition, the stress condition of the rod can be determined through the stress and strain detection of the truss structure. When the change exceeds a certain limit, the processor system calculates the variable displacement, controls the shear damping size, and thereby effectively prevents structural transients.

Claims

1. A magnetorheological variable damping stress release support, characterized by: The invention comprises a ball bearing base plate (1), a base force transmission rod (2), a vertical permanent magnet (3), a variable damping bearing outer cylinder (4), a magnetorheological elastomer damping layer (5), a cross-shaped coil (6), a permanent magnet fixing groove (7), a spherical inner cylinder (8), a bracket (9), an anisotropic ball outer cylinder (10), a wire groove (11), a permanent magnet angle steel bracket (12), a coil core (13), a base plate permanent magnet (14), a coil fixing shaft (15), a coil fixing shaft hole (16), a magnetic conductive sheet box (17), and a magnetorheological elastomer (18); the variable damping bearing outer cylinder (4) and the anisotropic ball outer cylinder are connected to each other. (10) are welded and connected, and the wall thickness of the two are consistent; the base force transmission rod (2) is connected to the upper node, and its lower part is connected to the spherical inner cylinder (8); a cross-shaped coil (6) is arranged inside the spherical inner cylinder (8); a permanent magnet fixing groove (7) is arranged at the bottom and upper part of the variable damping support outer cylinder (4); a coil is also arranged at the bottom of the variable damping support outer cylinder (4), a coil core (13) is arranged in the middle of the coil, and a bottom plate permanent magnet (14) is arranged on the upper part of the coil core (13); the coil and the vertical coil in the cross-shaped coil (6) in the spherical inner cylinder (8) are ensured to be in the same position; the variable The damping support outer cylinder (4) is also provided with a bracket (9) for fixing the vertical permanent magnet (3); permanent magnets are arranged in four directions of the variable damping support outer cylinder (4); the permanent magnets corresponding to each other are all of opposite poles; a coil fixing shaft (15) is arranged at the bottom of the variable damping support outer cylinder (4) and penetrates into the spherical inner cylinder (8) to ensure that the position of the coil remains unchanged during the rotation of the ball; the coil fixing shaft (15) passes through a circular hole reserved in the spherical inner cylinder (8), namely, a coil fixing shaft hole (16); the size of the coil fixing shaft hole (16) meets the maximum displacement required for the rotation of the spherical support; the M-shaped coil ( 6) are all placed in the magnetic conductive sheet box (17), and the coil is connected to the magnetic conductive sheet box; a gap is provided between the magnetic conductive sheet box (17) and the spherical inner cylinder (8) to ensure the rotation of the spherical inner cylinder (8); a gap is provided between the spherical inner cylinder (8) and the heterogeneous spherical outer cylinder (10), and a magnetorheological elastomer damping layer (5) is added in the gap; a connecting wire channel is provided between the spherical inner cylinder (8), the base force transmission rod (2) and the support ball; the magnetic field strength in the coil changes by changing the current, thereby affecting the overall stiffness and damping of the magnetorheological elastomer, and realizing the vertical, left-right and large-angle rotation of the entire support.

2. The magnetorheological variable damping stress release support according to claim 1 is characterized in that: The cross-shaped coil (6) is arranged in the spherical inner cylinder (8) in a manner that the three directions are orthogonal, that is, the orthogonal coils in the three directions are opposite to the magnetic poles of the corresponding permanent magnets outside.

3. The magnetorheological variable damping stress release support according to claim 1 is characterized in that: The anisotropic spherical outer cylinder (10) is formed by combining a circular shape and an elliptical shape, and the side projection of the elliptical sphere is a cylinder, so that the upper and lower movable distances are more in line with the maximum displacement design requirements generated during an earthquake.

4. The magnetorheological variable damping stress release support according to claim 1 is characterized in that: The gap between the magnetic conductive sheet box (17) and the spherical inner cylinder (8) is less than 1 cm.

5. The magnetorheological variable damping stress release support according to claim 1 is characterized in that: The magnetorheological elastomer damping layer (5) comprises a magnetic conductive sheet and a magnetorheological elastomer (18), and the magnetic conductive sheets are arranged outside the two magnetorheological elastomers (18); the magnetic conductive sheets are respectively connected to the spherical inner cylinder (8) and the heterogeneous spherical outer cylinder (10); the magnetic conductive sheet box (17) is in a groove shape, and the thickness of the magnetorheological elastomer (18) is greater than the height of the magnetic conductive sheet box.

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