Hydraulic amplification device based on semi-circular friction damper

Abstract

This invention relates to a hydraulic amplification device based on a semi-circular friction damper, belonging to the field of vibration control technology. It includes a large pull plate, a damper connector, a semi-circular friction damper, a rack and pinion connector, a fisheye ball joint, a short pin, a long pin, a reversing lever, a piston rod, an upper barrel fixing component, an upper barrel receiving component, an upper barrel, a side plate, a lower plate, a guide tube, a reaction frame cover plate, a reaction frame vertical plate, a lower barrel, a base support, a pressure plate, a friction plate, a threaded cover, a rectangular brake pad, a fluororubber sheet, a piston head, a piston, and hydraulic oil. When the amplification device is under load, the semi-circular friction damper has no output force, the reversing lever and the hydraulic amplification part do not function, and the friction plate dissipates energy under its own weight. When the amplification device is under unload, the semi-circular friction damper generates damping force. This damping force is amplified once by the reversing lever and then amplified a second time by the hydraulic pressure in the upper and lower barrels, transforming into normal pressure at the friction plate, which, combined with the movement of the friction plate, generates frictional force.

Description

Technical Field

[0001] This invention designs a hydraulic amplification device based on a half-cycle friction damper, which can be applied to vibration reduction control of engineering structures and belongs to the field of vibration control technology. Background Technology

[0002] Located at the junction of tectonic plates, my country is prone to earthquakes. Research shows that seismic isolation and damping structures have superior seismic performance compared to traditional structures. Generally, installing dampers in seismic isolation and damping structures increases structural stiffness and the seismic response of the superstructure. Applying negative stiffness dampers can provide equivalent negative stiffness, effectively reducing structural stiffness, extending the structural period, increasing damping, and achieving ideal vibration reduction. Since the output of a half-cycle friction damper is relatively small, a hydraulic amplification device based on Pascal's law is used to amplify its output, achieving the energy dissipation effect required in engineering practice.

[0003] For details of the specific structure of the semi-circular friction damper, please refer to the invention patent CN110886527A, published on March 17, 2020, which is an invention patent authorized by the research group. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a hydraulic amplification device based on a half-cycle friction damper, which solves the problem of amplifying the output of the half-cycle friction damper.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A hydraulic amplification device based on a semi-circular friction damper includes a large pull plate, a side plate, and a lower plate. The lower plate is fixed to the ground and is bolted to the side plate. The upper end of the large pull plate is connected to the semi-circular friction damper via a damper connector. The rack of the semi-circular friction damper is welded to an outer rack connector, which is then bolted to a fisheye ball hinge. A directional lever is hinged downwards to the fisheye ball hinge. A long pin is inserted into the side plate to fix the directional lever. The lower part of the directional lever is in seamless contact with an upper piston rod plate. The piston rod extends downwards into an upper bucket. The bottom is connected to a lower bucket via a conduit; the upper bucket, conduit, and lower bucket are all filled with hydraulic oil; the upper part of the lower bucket rests on a reaction frame cover plate, and reaction frame vertical plates are bolted to both sides of the reaction frame cover plate, which are welded to the lower plate; the steel ring at the bottom of the lower bucket is glued to a fluororubber sheet inside the lower bucket, and a base is placed under the fluororubber sheet; the base is pressed onto a pressure plate, which is bolted to the lower plate; the bottom of the large pull plate is hinged to a friction plate, and rectangular brake pads are welded and fixed to the upper and lower sides of the friction plate, with the upper and lower rectangular brake pads contacting the pressure plate and the lower plate respectively.

[0007] Furthermore, the upper and lower parts of the upper bucket are respectively provided with an upper bucket fixing component and an upper bucket receiving component, and the upper bucket fixing component and the upper bucket receiving component are bolted to the side plate to fix the upper bucket.

[0008] Furthermore, the upper end of the large pull plate is welded together with the damper connector, and the end plate of the damper connector is bolted to the semi-circular friction damper; the guide tube is bolted to the upper and lower buckets.

[0009] Furthermore, the fisheye ball hinge and the directional lever are hinged together by a short pin, and the long pin is located below the short pin.

[0010] Furthermore, a certain gap is left between the fisheye ball joint, the directional lever and the short pin shaft to ensure that the fisheye ball joint and the directional lever can rotate around the short pin shaft to a certain extent; a certain gap is also left between the long pin shaft and the directional lever to ensure that the directional lever can rotate around the long pin shaft to a certain extent.

[0011] Furthermore, the hydraulic oil inside the upper bucket, the conduit, and the lower bucket is filled, so that the lower part of the deflector lever and the upper plate of the piston rod are in seamless contact, without leaving any gaps or premature compression, and are in a state of just-contact; and the hydraulic oil inside the upper bucket, the conduit, and the lower bucket is in a sealed state to ensure no oil leakage and not affect the force transmission effect; a threaded cap is provided between the conduit and the reaction frame cover plate.

[0012] Furthermore, the piston rod is perpendicular to the lower plate, ensuring that the force on the piston rod can be effectively transmitted to the hydraulic oil in the upper tank; the upper part of the lower tank is in seamless contact with the reaction frame cover plate without leaving any gaps, ensuring that the lower tank has a good output force effect.

[0013] Furthermore, the bolt connection between the pressure plate and the lower plate has no preload; the bolts only serve to fix the pressure plate.

[0014] Furthermore, radial baffles are welded inside the lower barrel to constrain its deformation, and oil passage holes are provided on the radial baffles.

[0015] Furthermore, a piston head is provided at the bottom of the piston rod extending into the upper barrel, and a piston is provided between the outer periphery of the piston head and the inner wall of the upper barrel; the ratio of the input force area of ​​the piston head in the upper barrel to the output force area of ​​the fluororubber sheet in the lower barrel is the amplification factor of the hydraulic amplification part, and the amplification factor of the half-cycle friction damper force can be changed by adjusting the ratio of the two.

[0016] The principle of this invention is as follows: When the device is under loading, the half-cycle friction damper has no output, the directional lever and the hydraulic amplification part do not function, and the friction plate dissipates energy under the weight of the components. When the device is under unloading, the half-cycle friction damper generates damping force. This damping force is amplified once by the directional lever and then amplified a second time by the hydraulic pressure in the upper and lower buckets, transforming into positive pressure at the friction plate. This positive pressure, combined with the friction force generated by the movement of the friction plate, results in frictional force. The energy dissipation of this device includes the energy dissipation of the half-cycle friction damper and the energy dissipation of frictional force at the friction plate. Therefore, eliminating the force during the loading stage and retaining only the force during the unloading stage achieves the equivalent negative stiffness characteristic. The damping force of the half-cycle friction damper can be amplified through the lever amplification of the directional lever and the Pascal's principle amplification of the hydraulic amplification part, increasing the damper's output and energy dissipation effect.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention can alter the magnitude and form of the damping force in a hydraulic amplification device based on a half-cycle friction damper by changing the type of damper, altering the amplification factor of the lever, changing the ratio of the input force area of ​​the upper bucket to the output force area of ​​the lower bucket, and changing the material of the fluororubber sheet. This device can significantly amplify the output force of the damper and increase its energy dissipation, and can be applied in seismic isolation and vibration reduction structures, showing great promise for future applications.

[0019] This hydraulic amplification device based on a half-cycle friction damper has the following advantages:

[0020] First, the damping force of a small damper can be amplified to increase its energy dissipation effect, while maintaining stable mechanical properties.

[0021] Secondly, the mechanical characteristics of the hydraulic amplification device based on the semi-circular friction damper can be changed by altering the type of damper, changing the amplification factor of the lever, changing the ratio of the input force area of ​​the upper bucket to the output force area of ​​the lower bucket, and changing the material of the fluororubber sheet, etc., to change the magnitude and form of the damping force of the hydraulic amplification device based on the semi-circular friction damper. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the hydraulic amplification device based on a half-cycle friction damper according to the present invention;

[0023] Figure 2 This is a partial cross-sectional view of the hydraulic amplification device based on a half-cycle friction damper according to the present invention;

[0024] Figure 3 This is a cross-sectional view of the upper barrel structure;

[0025] Figure 4 This is a structural diagram of the large tension plate;

[0026] Figure 5This is a structural diagram of the damper connector;

[0027] Figure 6 This is a structural diagram of a semi-circular friction damper;

[0028] Figure 7 This is a structural diagram of the rack and pinion connector;

[0029] Figure 8 This is a structural diagram of a fisheye ball hinge;

[0030] Figure 9 This is a structural diagram of the short pin shaft;

[0031] Figure 10 This is a structural diagram of a long pin shaft;

[0032] Figure 11 This is a structural diagram of a reversible lever;

[0033] Figure 12 This is a structural diagram of the piston rod;

[0034] Figure 13 This is a structural diagram of the upper bucket fixing component;

[0035] Figure 14 This is a structural diagram of the upper barrel support component;

[0036] Figure 15 This is a structural diagram of the upper bucket;

[0037] Figure 16 This is a structural diagram of the side panel;

[0038] Figure 17 This is the structural diagram of the lower plate;

[0039] Figure 18 This is a structural diagram of a catheter;

[0040] Figure 19 This is a structural diagram of the reaction frame cover plate;

[0041] Figure 20 This is a structural diagram of the reaction frame vertical plate;

[0042] Figure 21 This is a structural diagram of the lower bucket;

[0043] Figure 22 This is a cross-sectional view of the lower bucket structure;

[0044] Figure 23 This is a structural diagram of the base;

[0045] Figure 24 This is a structural diagram of the pressure plate;

[0046] Figure 25 This is a structural diagram of the friction plate;

[0047] Figure 26 This is a structural diagram of a threaded cap;

[0048] Figure 27 This is a structural diagram of a rectangular brake pad;

[0049] Figure 28 This is a structural diagram of fluororubber sheets;

[0050] Figure 29 This is a structural diagram of the piston head;

[0051] Figure 30 This is a structural diagram of a piston;

[0052] Figure 31 This is the expected hysteresis curve of the hydraulic amplification device based on the half-cycle friction damper of the present invention;

[0053] Figure 32 This invention relates to the expected hysteresis curve caused by the self-weight at the friction plate of the hydraulic amplification device based on a half-cycle friction damper.

[0054] Figure 33 This is the hysteresis curve of the half-cycle friction damper in the hydraulic amplification device based on the half-cycle friction damper of the present invention;

[0055] Figure 34 The present invention is based on a hydraulic amplification device of a half-cycle friction damper, which amplifies the output of the half-cycle friction damper and generates the expected hysteresis curve at the friction plate.

[0056] In the diagram: 1. Large pull plate; 2. Damper connector; 3. Half-circumferential friction damper; 4. Rack connector; 5. Fisheye ball hinge; 6. Short pin; 7. Long pin; 8. Directional lever; 9. Piston rod; 10. Upper bucket fixing piece; 11. Upper bucket support piece; 12. Upper bucket; 13. Side plate; 14. Lower plate; 15. Guide tube; 16. Reaction frame cover plate; 17. Reaction frame vertical plate; 18. Lower bucket; 19. Base support; 20. Pressure plate; 21. Friction plate; 22. Threaded cap; 23. Rectangular brake pad; 24. Fluororubber sheet; 25. Piston head; 26. Piston; 27. Hydraulic oil. Detailed Implementation

[0057] The following is in conjunction with the appendix Figure 1-34 The structure and operating principle of the present invention will be further explained.

[0058] like Figure 1-2As shown, a hydraulic amplification device based on a semi-circular friction damper according to the present invention includes a large pull plate 1, a side plate 13, and a lower plate 14. The lower plate 14 is fixed to the ground and is bolted to the side plate 13. The upper end of the large pull plate 1 is connected to the semi-circular friction damper 3 via a damper connector 2. The rack of the semi-circular friction damper 3 is welded to an outer rack connector 4, which is bolted to a fisheye hinge 5. A directional lever 8 is hinged downwards to the fisheye hinge 5. A long pin 7 is inserted into the side plate 13 to fix the directional lever 8. The lower part of the directional lever 8 is in seamless contact with the upper plate of a piston rod 9. The piston rod 9 extends downwards into an upper barrel 12. Figure 1 As shown, the upper barrel 12 is provided with an upper barrel fixing component 10 and an upper barrel receiving component 11 at its upper and lower parts, respectively. Both the upper barrel fixing component 10 and the upper barrel receiving component 11 are bolted to the side plate 13 to fix the upper barrel 12. The bottom of the upper barrel 12 is connected to the lower barrel 18 through a conduit 15. The conduit 15 is strong enough to withstand the oil pressure during the test, and its deformation is small enough not to affect the transmission. This ensures that the hydraulic oil can flow smoothly through the upper barrel 12, the conduit 15, and the lower barrel 18, which is filled with hydraulic oil 27. The upper part of the lower barrel 18 rests on a reaction frame cover plate 16. The reaction frame cover plate 16 is bolted to both sides with reaction frame vertical plates 17, and the reaction frame vertical plates 17 are welded to the lower plate 14. The steel ring at the bottom of the lower barrel 18 is glued to a fluororubber sheet 24 inside the lower barrel 18, and a base support 19 is placed under the fluororubber sheet 24. The base 19 presses against a pressure plate 20, which is fixed to the lower plate 14 with bolts. The bolt connection between the pressure plate 20 and the lower plate 14 has no preload; the bolts only serve to fix the pressure plate 20. The bottom of the large pull plate 1 is hinged to a friction plate 21. Rectangular brake pads 23 are welded and fixed to the upper and lower sides of the friction plate 21, and the upper and lower rectangular brake pads 23 contact the pressure plate 20 and the lower plate 14, respectively.

[0059] like Figure 1 As shown, in this embodiment, the upper end of the large pull plate 1 is welded to the damper connector 2, and the end plate of the damper connector 2 is bolted to the semi-circular friction damper 3. The guide tube 15 is bolted to the upper bucket 12 and the lower bucket 18. Furthermore, the fisheye ball hinge 5 and the directional lever 8 are hinged together by a short pin 6, and a long pin 7 is located below the short pin 6. A certain gap is left between the fisheye ball hinge 5, the directional lever 8, and the short pin 6 to ensure that the fisheye ball hinge 5 and the directional lever 8 can rotate around the short pin 6. A certain gap is also left between the long pin 7 and the directional lever 8 to ensure that the directional lever 8 can rotate around the long pin 7. The lower plate 14 has bolt holes for easy installation and use.

[0060] In this embodiment, the hydraulic oil 27 inside the upper barrel 12, conduit 15, and lower barrel 18 is fully filled, ensuring seamless contact between the lower part of the deflector lever 8 and the upper plate of the piston rod 9. There should be no gaps, and premature compression should be avoided; the contact should be precise. Furthermore, the hydraulic oil 27 inside the upper barrel 12, conduit 15, and lower barrel 18 is sealed to prevent leakage and ensure effective force transmission. A threaded cap 22 is provided between the conduit 15 and the reaction frame cover plate 16 for a sealed connection. Additionally, the piston rod 9 is perpendicular to the lower plate 14, ensuring that the force on the piston rod 9 is effectively transmitted to the hydraulic oil 27 in the upper barrel 12. The upper part of the lower barrel 18 is in seamless contact with the reaction frame cover plate 16, ensuring good output force from the lower barrel.

[0061] like Figure 3 As shown, a piston head 25 is provided at the bottom of the piston rod 9 that extends into the upper barrel 12, and a piston 26 is provided between the outer periphery of the piston head 25 and the inner wall of the upper barrel 12. Figure 21-22 As shown, radial baffles are welded inside the lower barrel 18 to constrain the deformation of the lower barrel 18, and oil passage holes are left on the radial baffles.

[0062] like Figure 1 As shown, in this embodiment, the ratio of the input force area of ​​the piston head 25 in the upper barrel 12 to the output force area of ​​the fluororubber sheet 24 in the lower barrel 18 is the amplification factor of the hydraulic amplification part. Adjusting this ratio changes the amplification factor of the half-cycle friction damper force. Furthermore, as... Figure 11 As shown, the upper hole of the reversing lever 8 is the input position of the force, the lower hole is the fulcrum position, and the two lower legs are the output positions of the force. It is made according to the lever principle. The reversing lever 8 can not only amplify the force, but also change the direction of the transmitted force.

[0063] The damping force of the hydraulic amplification device based on the semi-circular friction damper is the sum of the damping force of the semi-circular friction damper and the friction force at the friction plate.

[0064] In the initial state, it is the initial state of the half-cycle friction damper 3, that is, there is a gear friction device at the front and rear ends on both sides of the rack, and the rack and gear are in contact but not meshed. When the amplification device enters the loading stage, the large pull plate 1 pushes the damper connecting piece 2 forward, thereby pushing the half-cycle friction damper 3 forward. The one-way gear spins freely and does not generate damping force. The change lever 8 and the hydraulic amplification part do not play a role. The large pull plate 1 pushes the friction plate 21 forward and consumes energy under the weight of the lower bucket 18, hydraulic oil 27, base support 19, etc.

[0065] When the amplification device enters the unloading stage, the large pull plate 1 pulls the damper connector 2 backward, thereby pulling the half-circumference friction damper 3 backward. The internal friction gear works and generates damping force. The damping force is amplified once by the reversing lever and then amplified a second time by the hydraulic pressure in the upper barrel 12 and lower barrel 18. The force is output at the fluororubber sheet 24 and converted into the positive pressure at the friction plate 21. The friction plate 21 generates friction force under the pull of the large pull plate 1.

[0066] The energy consumption of this device includes the energy consumption of the half-cycle friction damper 3 and the frictional energy consumption at the friction plate 21. Therefore, eliminating the force during the loading stage and retaining only the force during the unloading stage can achieve the equivalent negative stiffness characteristic. By amplifying the lever of the directional lever 8 and the Pascal's principle amplification in the hydraulic amplification section, the damping force of the half-cycle friction damper can be amplified, increasing the output force of the damper and increasing the energy consumption effect.

[0067] The expected hysteresis curve in this embodiment is as follows: Figure 31 As shown, subtracting the expected hysteresis curve caused by the self-weight at the friction plate and the hysteresis curve generated by the half-cycle friction damper from the hysteresis curve yields the expected hysteresis curve generated at the friction plate after amplifying the output of the half-cycle friction damper. Figure 34 As shown, the hydraulic amplification device based on a half-cycle friction damper exhibits negative stiffness characteristics during operation and can amplify the output force of the damper. Furthermore, the mechanical characteristics of the hydraulic amplification device based on the half-cycle friction damper can be adjusted by considering factors such as the type of damper, the amplification factor of the directional lever, the ratio of the input force area of ​​the upper barrel to the output force area of ​​the lower barrel, and the material of the fluororubber sheet. These factors influence the amplification factor and hysteresis performance of the hydraulic amplification device based on the half-cycle friction damper.

[0068] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic amplification device based on a half-cycle friction damper, characterized by: Including big pull plate (1), side plate (13) and lower plate (14), the lower plate (14) is fixed to the ground, and the lower plate (14) and the side plate (13) are fixedly connected together by bolts;The upper end of the big pull plate (1) and the half-week friction damper (3) are connected together by a damper connecting piece (2), the rack of the half-week friction damper (3) is welded with a rack connecting piece (4) on the outside, and the rack connecting piece (4) is bolted with a fish eye ball hinge (5);The fish eye ball hinge (5) is downwardly hinged with a reversing lever (8), a long pin shaft (7) is inserted in the side plate (13) to fix the reversing lever (8), and the lower part of the reversing lever (8) is in seamless contact with an upper plate of a piston rod (9);The piston rod (9) extends downwardly into an upper barrel (12);The bottom of the upper barrel (12) is connected with a lower barrel (18) through a conduit (15);The inside of the upper barrel (12), the conduit (15) and the lower barrel (18) are all filled with hydraulic oil (27);The upper part of the lower barrel (18) is placed on a counterforce frame cover plate (16), and the counterforce frame cover plate (16) is bolted with counterforce frame vertical plates (17) on both sides, and the counterforce frame vertical plates (17) are welded with the lower plate (14);The steel ring at the bottom of the lower barrel (18) is bonded with a fluororubber sheet (24) in the inside of the lower barrel (18) by glue, and a bottom support (19) is placed below the fluororubber sheet (24);The bottom support (19) is pressed on a pressing plate (20), and the pressing plate (20) is fixed on the lower plate (14) by bolts;The bottom of the big pull plate (1) is hinged with a friction plate (21), and rectangular brake pads (23) are welded and fixed on the upper and lower sides of the friction plate (21), and the upper and lower rectangular brake pads (23) are in contact with the pressing plate (20) and the lower plate (14) respectively; The hydraulic oil (27) in the inside of the upper barrel (12), the conduit (15) and the lower barrel (18) is filled, so that the lower part of the reversing lever (8) is in seamless contact with the upper plate of the piston rod (9), neither gap nor early extrusion, in the state of just contact;And the hydraulic oil (27) in the inside of the upper barrel (12), the conduit (15) and the lower barrel (18) is in a sealed state, which ensures no oil leakage and does not affect the force transmission effect;A threaded cap (22) is arranged between the conduit (15) and the counterforce frame cover plate (16); Radiating baffles are welded in the inside of the lower barrel (18) to constrain the deformation of the lower barrel (18), and oil holes are left on the radiating baffles; A piston head (25) is arranged at the bottom of the piston rod (9) extending into the upper barrel (12), and a piston (26) is arranged between the outer periphery of the piston head (25) and the inner wall of the upper barrel (12);The ratio of the input force area of the piston head (25) in the upper barrel (12) to the output force area of the fluororubber sheet (24) in the lower barrel (18) is the magnification of the hydraulic amplification part, and the magnification of the force of the half-week friction damper can be changed by adjusting the ratio.

2. The hydraulic amplification device based on a half-period friction damper according to claim 1, characterized in that: The upper barrel (12) is provided with an upper barrel fixing member (10) and an upper barrel receiving member (11) at the upper and lower parts respectively, the upper barrel fixing member (10) and the upper barrel receiving member (11) are bolted with the side plate (13) to fix the upper barrel (12).

3. The hydraulic amplification device based on semi-periodic friction damper according to claim 2, characterized in that: The upper end of the large pull plate (1) and the damper connecting member (2) are welded together, the end plate of the damper connecting member (2) is bolted with the semi-week friction damper (3); the guide pipe (15) is bolted with the upper barrel (12) and the lower barrel (18).

4. The hydraulic amplification device based on semi-period friction damper according to claim 2, characterized in that: The fisheye ball hinge (5) and the direction-changing lever (8) are hinged through the short pin shaft (6), and the long pin shaft (7) is located at the lower side of the short pin shaft (6).

5. The hydraulic amplification device based on semi-periodic friction damper according to claim 4, characterized in that: The connection between the fisheye ball hinge (5), the direction-changing lever (8) and the short pin shaft (6) leaves a certain gap to ensure that the fisheye ball hinge (5) and the direction-changing lever (8) can rotate around the short pin shaft (6); the long pin shaft (7) and the direction-changing lever (8) also leave a certain gap to ensure that the direction-changing lever (8) can rotate around the long pin shaft (7).

6. The hydraulic amplification device based on semi-periodic friction damper according to claim 1, characterized in that: The piston rod (9) is perpendicular to the lower plate (14), which ensures that the force received by the piston rod (9) can be effectively transmitted to the hydraulic oil (27) in the upper barrel (12); the upper part of the lower barrel (18) is in seamless contact with the counterforce frame cover plate (16), without leaving a gap, which ensures good output force effect of the lower barrel.

7. The hydraulic amplification device based on semi-periodic friction damper according to claim 1, characterized in that: The bolt connection between the pressing plate (20) and the lower plate (14) has no pre-tightening force, and the bolt only plays a role in fixing the pressing plate (20).

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