Double-box inter-sleeve shape memory alloy damper

Abstract

The present application belongs to the technical field of shock absorption, and discloses a double-box interfitting shape memory alloy damper, which comprises two interfitting first and second U-shaped plates; the first U-shaped plate is fixed with a first sealing plate, and the second U-shaped plate is fixed with a second sealing plate; the first sealing plate is located in the second U-shaped plate and is in contact with the horizontal arm plate of the second U-shaped plate; the second sealing plate is located in the first U-shaped plate and is in contact with the horizontal arm plate of the first U-shaped plate; a plurality of guide holes are formed in the horizontal arm plates of the first and second U-shaped plates, and a guide rod is arranged in each guide hole; a plurality of first SMA energy dissipation groups are arranged between the vertical arm of the first U-shaped plate and the second sealing plate; a plurality of second SMA energy dissipation groups are arranged between the second sealing plate and the first sealing plate; and a plurality of third SMA energy dissipation groups are arranged between the first sealing plate and the vertical arm of the second U-shaped plate. The damper does not fail and break, has strong reset ability, and has wide application range.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shock absorption, and relates to a double-box interfitting shape memory alloy damper. BACKGROUND

[0002] Shape memory alloy (SMA) is a kind of intelligent metal sensing and driving material with excellent performance, which has unique shape memory effect, super-elasticity and variable damping characteristics, and has no residual deformation, corrosion resistance and strain sensitivity. At present, there are many shape memory alloy products developed and applied, such as wire, bar and strip. In engineering, austenitic shape memory alloy is often used to make high-damping SMA dampers, which utilize the variable damping and variable stiffness characteristics under reciprocating load to perform hysteretic energy dissipation and passive vibration control of engineering structures.

[0003] However, most of the current SMA dampers are made of SMA wires, which are prone to breakage under large vibration, and need to be specially designed anchors for fixation. When the stress is large, the end anchor head is prone to relaxation, which affects the damping effect of the SMA damper. When SMA rods are used, they are prone to instability and failure under compression, which limits their application in practical engineering. SUMMARY

[0004] The purpose of the present application is to solve the problems of SMA wire breakage and anchor head relaxation in the existing SMA damper under large vibration, and to provide a double-box interfitting shape memory alloy damper, in which the SMA rod of the energy dissipation group can slide freely under compression, so as not to be prone to instability and failure.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] The present application provides a double-box interfitting shape memory alloy damper, which comprises two interfitting first and second U-shaped plates, the U-shaped sections of the first and second U-shaped plates are perpendicular to each other, the first U-shaped plate is fixed with a first sealing plate, and the second U-shaped plate is fixed with a second sealing plate, the first sealing plate is located in the second U-shaped plate and in contact with the horizontal arm plate of the second U-shaped plate, the second sealing plate is located in the first U-shaped plate and in contact with the horizontal arm plate of the first U-shaped plate, a plurality of guide holes are formed in the horizontal arm plates of the first and second U-shaped plates, a guide rod is arranged in each guide hole, and one end of the guide rod is embedded in the side wall of the first sealing plate or the side wall of the second sealing plate.

[0007] A plurality of first SMA energy dissipation groups are arranged between the vertical arms of the first U-shaped plate and the second sealing plate, a plurality of second SMA energy dissipation groups are arranged between the second sealing plate and the first sealing plate, and a plurality of third SMA energy dissipation groups are arranged between the first sealing plate and the vertical arms of the second U-shaped plate, and the second SMA energy dissipation groups are arranged alternately above and below the first SMA energy dissipation groups and the third SMA energy dissipation groups.

[0008] In one technical solution, the guide hole is a rectangular through hole.

[0009] In one technical solution, the guide rod is circular or square, and the guide rod is in clearance fit with the guide hole.

[0010] In one technical solution, the first SMA energy dissipation group, the second SMA energy dissipation group and the third SMA energy dissipation group each include a plurality of nickel-titanium shape memory alloy rods, and threads are formed at both ends of each nickel-titanium shape memory alloy rod.

[0011] In one technical solution, the left end of each nickel-titanium shape memory alloy rod in the first SMA energy dissipation group is fixed to the vertical arm of the first U-shaped plate, the right end of each nickel-titanium shape memory alloy rod in the first SMA energy dissipation group passes through the second sealing plate and is fixed by a nut, the left end of each nickel-titanium shape memory alloy rod in the second SMA energy dissipation group passes through the first sealing plate and is fixed by a nut, the right end of each nickel-titanium shape memory alloy rod in the second SMA energy dissipation group passes through the second sealing plate and is fixed by a nut, the left end of each nickel-titanium shape memory alloy rod in the third SMA energy dissipation group passes through the first sealing plate and is fixed by a nut, and the right end of each nickel-titanium shape memory alloy rod in the third SMA energy dissipation group is fixed to the vertical wall of the second U-shaped plate.

[0012] Compared with the prior art, the beneficial effects of the present application are that:

[0013] The first SMA energy dissipation group, the second SMA energy dissipation group and the third SMA energy dissipation group of the double-box nested shape memory alloy damper of the present application are all subjected to tensile energy dissipation, when vibration occurs, the first U-shaped plate moves left or right, the SMA energy dissipation group always alternately undergoes tensile energy dissipation, the SMA rod is movably connected to the sealing plate through a nut, so that it can freely pass through the sealing plate when subjected to pressure, and will not be broken, relaxed or destabilized, has strong reset ability, wide application range, simple structure, and is convenient to process, install and disassemble. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a main sectional structure schematic diagram of the double-box nested shape memory alloy damper of the present application.

[0015] Figure 2 It is a front view structure schematic diagram of the double-box nested shape memory alloy damper of the present application.

[0016] Figure 3 It is a top view structure schematic diagram of the double-box nested shape memory alloy damper of the present application.

[0017] Figure 4A-A cross-sectional view in the present application Figure 3

[0018] Figure 5 B-B cross-sectional view in the present application Figure 3

[0019] In the drawings, 1 is a first U-shaped plate, 2 is a second U-shaped plate, 3 is a first sealing plate, 4 is a second sealing plate, 5 is a first nut, 6 is a second nut, 7 is a first guide hole, 8 is a second guide hole, 9 is a first SMA energy dissipation group, 10 is a second SMA energy dissipation group, 11 is a third SMA energy dissipation group, 12 is a first connecting rod, 13 is a second connecting rod, 14 is a first guide rod, and 15 is a second guide rod. DETAILED DESCRIPTION

[0020] The following examples are intended to illustrate the present application but not to limit the scope of protection of the present application. If not specifically indicated, the technical means used in the examples are conventional means known to those skilled in the art. The test methods in the following examples are conventional methods unless otherwise specified.

[0021] Example 1

[0022] As shown in Figures 1-5 , the present application is a double-box nested shape memory alloy damper, which comprises two nested first U-shaped plates 1 and second U-shaped plates 2. The U-shaped sections of the first U-shaped plates 1 and the second U-shaped plates 2 are perpendicular, i.e. the first U-shaped plates 1 are inserted into the second U-shaped plates 2 after rotating 90°. The right end of the first U-shaped plates 1 is fixed with the first sealing plate 3 through the first nut 5, and the left end of the second U-shaped plates 2 is fixed with the second sealing plate 4 through the second nut 6. The first sealing plate 3 is located in the second U-shaped plate 2 and in contact with the horizontal arm plate of the second U-shaped plate 2, and the second sealing plate 4 is located in the first U-shaped plate 1 and in contact with the horizontal arm plate of the first U-shaped plate. A plurality of guide holes are formed on the horizontal arm plates of the first U-shaped plates 1 and the second U-shaped plates 2, and a guide rod is arranged in each guide hole. One end of the guide rod is embedded in the side wall of the first sealing plate 3 or the side wall of the second sealing plate 4.

[0023] As shown in Figure 1 , the present application is a double-box nested shape memory alloy damper, which comprises two nested first U-shaped plates 1 and second U-shaped plates 2. The U-shaped sections of the first U-shaped plates 1 and the second U-shaped plates 2 are perpendicular, i.e. the first U-shaped plates 1 are inserted into the second U-shaped plates 2 after rotating 90°. The right end of the first U-shaped plates 1 is fixed with the first sealing plate 3 through the first nut 5, and the left end of the second U-shaped plates 2 is fixed with the second sealing plate 4 through the second nut 6. The first sealing plate 3 is located in the second U-shaped plate 2 and in contact with the horizontal arm plate of the second U-shaped plate 2, and the second sealing plate 4 is located in the first U-shaped plate 1 and in contact with the horizontal arm plate of the first U-shaped plate. A plurality of guide holes are formed on the horizontal arm plates of the first U-shaped plates 1 and the second U-shaped plates 2, and a guide rod is arranged in each guide hole. One end of the guide rod is embedded in the side wall of the first sealing plate 3 or the side wall of the second sealing plate 4.

[0024] In one embodiment, as Figure 1 ​​As shown, two guide holes are formed on the horizontal arm plates of the first U-shaped plate 1 and the second U-shaped plate 2, the guide holes are rectangular through holes, the guide rods in the guide holes are circular or square, for example, the guide rod in the guide hole on the horizontal arm plate of the second U-shaped plate 2 is a first guide rod 14, the guide rod in the guide hole on the horizontal arm plate of the first U-shaped plate 1 is a second guide rod 15, the first guide rod 14 and the second guide rod 15 are in clearance fit with the guide holes, so that the guide rods can slide left and right in the guide holes, so as to ensure that the damper always maintains horizontal axial movement during operation.

[0025] In the present application, the first SMA energy dissipation group 9, the second SMA energy dissipation group 10 and the third SMA energy dissipation group 11 each include a plurality of nickel-titanium shape memory alloy rods, and threads are formed at both ends of each nickel-titanium shape memory alloy rod. In the first SMA energy dissipation group 9, the left end of each nickel-titanium shape memory alloy rod is fixed to the vertical arm of the first U-shaped plate 1, and the right end passes through the second sealing plate 4 and is fixed with a nut; in the second SMA energy dissipation group 10, the two ends of each nickel-titanium shape memory alloy rod pass through the first sealing plate 3 and the second sealing plate 4 respectively and are fixed with nuts; and in the third SMA energy dissipation group 11, the left end of each nickel-titanium shape memory alloy rod passes through the first sealing plate 3 and is fixed with a nut, and the right end is fixed to the vertical wall of the second U-shaped plate 2. In this way, when the SMA rods are under pressure, they can slide left and right along the first sealing plate 3 or the second sealing plate 4, preventing instability and damage. In addition, the diameters and numbers of the SMA rods in the first SMA energy dissipation group 9 and the third SMA energy dissipation group 11 are equal; the number of the SMA rods in the second SMA energy dissipation group 10 is twice that of the first SMA energy dissipation group 9 in the case of equal diameter, or the diameter is twice that of the first SMA energy dissipation group 9 in the case of equal number, so as to ensure that the tension is equal when the SMA damper moves left and right, and the energy dissipation is balanced.

[0026] The energy dissipation principle of the double-box nested shape memory alloy damper of the present application is as follows: it is assumed that the right end of the first U-shaped plate 1 is fixed to the building structure through the first connecting rod 12, and the right end of the second U-shaped plate 2 is fixed to the building structure through the second connecting rod 13. When the first connecting rod 12 at the left end of the first U-shaped plate 1 slides to the left under tension, the SMA rods of the first SMA energy dissipation group 9 and the third SMA energy dissipation group 11 are simultaneously tensioned to dissipate energy, and the SMA rods of the second SMA energy dissipation group 10 are compressed to slide out from the right side of the first sealing plate 3 or the left side of the second sealing plate 4, preventing instability and damage of the SMA rods.

[0027] When the first connecting rod 12 at the left end of the first U-shaped plate 1 slides to the right under thrust, the SMA rods of the second SMA energy dissipation group 10 are tensioned to dissipate energy, the SMA rods of the first SMA energy dissipation group 9 are compressed to slide out from the right end of the second sealing plate 4, and the SMA rods of the third SMA energy dissipation group 11 are all compressed to slide out from the left end of the first sealing plate 3, preventing instability and damage of the SMA rods.

[0028] ​The energy consumption group adopts the SMA rod, has large energy consumption effect, the SMA rod cannot be broken, relaxed and destroyed, has strong reset ability, wide application range and easy processing.

[0029] The above-mentioned embodiments are only preferred embodiments of the present application, and are used to explain the present application, but not limit the scope of the present application. For those skilled in the art, other embodiments can be easily obtained by substitution or change according to the technical content disclosed in the present application. Therefore, any change and improvement made on the principle of the present application shall be included in the scope of the present application.

Claims

1. A double-box interlocking shape memory alloy damper, characterized in that, It includes two interlocking first U-shaped plates (1) and second U-shaped plates (2), the U-shaped sections of the first U-shaped plates (1) and the second U-shaped plates (2) are perpendicular to each other; the first U-shaped plate (1) is fixed to the first sealing plate (3), the second U-shaped plate (2) is fixed to the second sealing plate (4), the first sealing plate (3) is located in the second U-shaped plate (2) and contacts the horizontal arm plate of the second U-shaped plate (2), the second sealing plate (4) is located in the first U-shaped plate (1) and contacts the horizontal arm plate of the first U-shaped plate; multiple guide holes are opened on the horizontal arm plates of the first U-shaped plate (1) and the second U-shaped plate (2), and a guide rod is set in each guide hole, one end of the guide rod is embedded in the side wall of the first sealing plate (3) or the side wall of the second sealing plate (4); Multiple sets of first SMA energy dissipation groups (9) are arranged between the vertical arm of the first U-shaped plate (1) and the second sealing plate (4). Multiple sets of second SMA energy dissipation groups (10) are arranged between the second sealing plate (4) and the first sealing plate (3). Multiple sets of third SMA energy dissipation groups (11) are arranged between the vertical arm of the first sealing plate (3) and the second U-shaped plate (2). The second SMA energy dissipation groups (10), the first SMA energy dissipation groups (9), and the third SMA energy dissipation groups (11) are arranged alternately. The first SMA energy dissipation group (9), the second SMA energy dissipation group (10), and the third SMA energy dissipation group (11) all include multiple nickel rods. Titanium shape memory alloy rods, each nickel-titanium shape memory alloy rod having threads at both ends; in the first SMA energy-consuming group (9), the left end of each nickel-titanium shape memory alloy rod is fixed to the vertical arm of the first U-shaped plate (1), and the right end passes through the second sealing plate (4) and is fixed with a nut; in the second SMA energy-consuming group (10), the two ends of each nickel-titanium shape memory alloy rod pass through the first sealing plate (3) and the second sealing plate (4) respectively and are fixed with nuts; in the third SMA energy-consuming group (11), the left end of each nickel-titanium shape memory alloy rod passes through the first sealing plate (3) and is fixed with a nut, and the right end is fixed to the vertical wall of the second U-shaped plate (2).

2. The double-box interlocking shape memory alloy damper according to claim 1, characterized in that, The guide hole is a rectangular through hole.

3. The double-box interlocking shape memory alloy damper according to claim 1, characterized in that, The guide rod is round or square, and the guide rod is clearance-fitted with the guide hole.

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