CN212271290U - A frequency-modulated rotating mass variable friction damper - Google Patents
A frequency-modulated rotating mass variable friction damper Download PDFInfo
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- CN212271290U CN212271290U CN202021348742.0U CN202021348742U CN212271290U CN 212271290 U CN212271290 U CN 212271290U CN 202021348742 U CN202021348742 U CN 202021348742U CN 212271290 U CN212271290 U CN 212271290U
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Abstract
The utility model discloses a variable friction damper of frequency modulation rotating mass, which comprises a frame, a ball screw, a limiting steel plate, a T-shaped steel plate, a spring and a rotating friction mechanism; the rotary friction mechanism is arranged on the rack, the T-shaped steel plates are slidably mounted on the rack and are respectively positioned on two sides of the rotary friction mechanism, the spring is arranged between the rotary friction mechanism and the T-shaped steel plates, two ends of the spring are respectively connected with the rotary friction mechanism and the T-shaped steel plates, the ball screw penetrates through the rack, the two T-shaped steel plates and the rotary friction mechanism along the horizontal direction, and the two limiting steel plates are fixedly mounted on the ball screw and are in contact with one side face, far away from the spring, of the corresponding T-shaped steel plate. The beneficial effects are that: the damper can realize variable friction; meanwhile, the rotation of the circular ring-shaped steel block provides a mass amplification effect, the larger mass required by frequency modulation damping is realized by arranging a smaller mass block, the structure is simple, and the occupied space is small.
Description
Technical Field
The utility model relates to a building structure frequency modulation shock attenuation technical field, concretely relates to frequency modulation rotating mass variable friction damper.
Background
The external excitation such as earthquake, strong wind and the like has the effect that the civil engineering structure is easy to generate large-amplitude vibration, and the safety and the comfort of the civil engineering structure are seriously threatened. In the face of various vibration disasters occurring in the real environment, it is very important to improve the earthquake resistance, wind resistance and disaster resistance of the engineering structure, and people are also always seeking various methods to effectively reduce and inhibit the damage to the engineering structure caused by controlling the vibration response.
Chinese utility model patent application CN109811925A and chinese utility model patent application CN109707788A disclose a displacement amplification type rotation friction damper and a rotating mass friction damper respectively, and two devices all need to set up great pretightning force, and the damping force that provides is the constant basically, can not provide reliable power consumption ability effectively in different grade earthquakes, wind shake.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of above prior art existence, provide a frequency modulation rotating mass variable friction damper with variable friction effect, can realize becoming the friction, all provide reliable power consumption ability in the earthquake of different grades, wind shake.
The purpose of the utility model is realized through the following technical scheme: a frequency modulation rotating mass variable friction damper comprises a rack, a ball screw, a limiting steel plate, a T-shaped steel plate, a spring and a rotating friction mechanism; the rotary friction mechanism is arranged on the rack, the T-shaped steel plates are slidably mounted on the rack and are respectively positioned on two sides of the rotary friction mechanism, the spring is arranged between the rotary friction mechanism and the T-shaped steel plates, two ends of the spring are respectively connected with the rotary friction mechanism and the T-shaped steel plates, the ball screw penetrates through the rack, the two T-shaped steel plates and the rotary friction mechanism along the horizontal direction, the two limiting steel plates are fixedly mounted on the ball screw and are in contact with one side face, far away from the spring, of the corresponding T-shaped steel plate, and a screw nut of the ball screw is connected with the rotary friction mechanism.
Further, the rotary friction mechanism comprises square steel plates, circular friction plates and circular steel plates, the screw nut comprises a nut head and a nut rod which are integrally formed, the two square steel plates are oppositely arranged on the frame, the two circular friction plates are respectively arranged on the two square steel plates and are oppositely arranged, the nut head is positioned between the two circular friction plates, the two circular steel plates are respectively arranged on two end faces of the nut head and are contacted with the corresponding circular friction plates, the nut rod sequentially penetrates through a central through hole of one circular steel plate, a central through hole of one circular friction plate and a central through hole of one square steel plate, the spring is arranged at one end, far away from the circular friction plates, of the square steel plate, one end of the spring is connected with the square steel plates, and the other end of the spring is connected with the corresponding T-shaped steel plate, the square steel plate, the lead screw nut and the rack are relatively fixed along the axial direction of the ball screw.
Furthermore, the rotary friction mechanism also comprises two thrust bearings and a limiting steel pipe; one thrust bearing is arranged in a central through hole of a square steel plate which is penetrated by the nut rod, the thrust bearing is respectively connected with the square steel plate and the nut rod, and the other thrust bearing is respectively connected with the nut head and the other square steel plate.
Furthermore, the limiting steel pipe is fixedly arranged in a central through hole of another square steel plate, one end of the limiting steel pipe extends to the central through hole of the adjacent circular steel block, and the other thrust bearing is arranged on one end face of the limiting steel pipe and connected with the nut head.
Furthermore, seen from the axial direction of the ball screw, the limiting steel pipe and the thrust bearing installed on the limiting steel pipe are both located in the central through hole of the circular steel block and are not in contact with the circular steel block.
Furthermore, two springs are arranged between each T-shaped steel plate and the rotary friction mechanism and are symmetrically arranged along the axis of the ball screw.
Further, the T-shaped steel plate comprises a first vertical plate and a second vertical plate; the first vertical plate is slidably arranged on the rack, one side face of the first vertical plate is connected with the spring, the second vertical plate is arranged on one side face, far away from the spring, of the first vertical plate, the second vertical plate is in opposite contact with the corresponding limiting steel plate, and the ball screw penetrates through the rack, the two first vertical plates, the two second vertical plates and the rotary friction mechanism along the horizontal direction.
Further, the frame comprises a bottom plate, a cover plate and side plates; the two side plates are arranged at intervals, the cover plate is arranged at the top ends of the two side plates, the bottom plate is arranged at the bottom ends of the two side plates, oppositely arranged grooves are formed in the cover plate and the bottom plate and are positioned between the two side plates, the rotary friction mechanism is arranged in the grooves, two sides of the rotary friction mechanism are both contacted with step walls on two sides of the grooves, oppositely arranged slide grooves are formed in the cover plate and the bottom plate and are respectively positioned on two sides of the grooves and between the two side plates, the T-shaped steel plates are slidably arranged in the corresponding slide grooves, and the ball screw penetrates through the two side plates, the two T-shaped steel plates and the rotary friction mechanism along the horizontal direction.
Furthermore, a certain interval is arranged between the slide channel groove and the adjacent groove, and a certain interval is arranged between the slide channel groove and the adjacent side plate.
Furthermore, the frame still includes the strengthening rib, the one end of strengthening rib is connected with the curb plate and is kept away from one side of spacing steel sheet, the other end and the bottom plate of strengthening rib are connected.
Furthermore, the bottom plate is provided with a mounting hole for connecting with a building.
Compared with the prior art, the utility model have following advantage:
1. the utility model provides a frequency modulation rotating mass becomes friction damper sets up the spring through the both sides at the spin friction mechanism, along with ball's horizontal reciprocating motion, T shaped steel board extrusion spring produces the normal pressure that changes, makes spin friction mechanism realize becoming the friction, all provides reliable power consumption ability in the earthquake of different grades, wind shake.
2. The utility model provides a rotary friction mechanism through rational design ball screw pitch and the radial size of ring shape steel block, can realize the magnification of adjustment quality, and the quality can be enlarged hundreds of times or even thousand times, consequently, need not to set up the quality piece of large-tonnage and can satisfy the demand of frequency modulation damping technique to the large-tonnage quality, and simple structure, occupation space are little.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural view of a frequency modulated rotating mass variable friction damper according to the present invention;
fig. 2 shows a schematic structural view of a rotary friction mechanism according to the present invention;
fig. 3 shows a schematic structural view of the circular ring-shaped friction plate installed on the square steel plate according to the present invention;
fig. 4 shows a schematic structural view of a thrust bearing, a lead screw nut and a limiting steel tube according to the present invention;
in the figure, 1 is a frame; 2 is a ball screw; 3 is a limiting steel plate; 4 is a T-shaped steel plate; 5 is a spring; 6 is a square steel plate; 7 is a circular friction plate; 8 is a circular ring-shaped steel block; 9 is a nut head; 10 is a nut rod; 11 is a thrust bearing; 12 is a limit steel pipe; 13 is a first vertical plate; 14 is a second vertical plate; 15 is a bottom plate; 16 is a cover plate; 17 is a side plate; 18 is a groove; 19 is a chute; 20 is a reinforcing rib; 21 is a mounting hole; 22 is a central through hole.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
For ease of description, the orientations described below will now be described as follows: the up, down, left, and right directions described below correspond to the up, down, left, and right directions of fig. 2 itself.
The frequency-modulation rotary mass-variable friction damper shown in fig. 1 comprises a frame 1, a ball screw 2, a limiting steel plate 3, a T-shaped steel plate 4, a spring 5 and a rotary friction mechanism; the rotary friction mechanism is arranged on the rack 1, the T-shaped steel plates 4 are slidably mounted on the rack 1 and are respectively located on two sides of the rotary friction mechanism, the springs 5 are arranged between the rotary friction mechanism and the T-shaped steel plates 4, two ends of each spring 5 are respectively connected with the rotary friction mechanism and the T-shaped steel plates 4, the ball screw 2 penetrates through the rack 1, the two T-shaped steel plates 4 and the rotary friction mechanism along the horizontal direction, the two limiting steel plates 3 are fixedly mounted on the ball screw 2 and are in contact with one side face, far away from the springs 5, of the corresponding T-shaped steel plate 4, and a screw nut of the ball screw 2 is connected with the rotary friction mechanism. The ball screw 2 is connected with a building, the ball screw 2 penetrates through the rack, but the ball screw 2 is not in contact with the rack. When no vibration (earthquake or wind vibration) occurs, the spring is in a normal state (i.e., not stretched and compressed). When vibration takes place, under the effect of building, ball 2 is along horizontal direction reciprocating motion to compress the spring 5 of rotatory friction mechanism both sides in turn, provide the pretightning force that changes for rotatory friction mechanism, realize becoming the friction.
Two springs 5 are arranged between each T-shaped steel plate 4 and the rotary friction mechanism, and the two springs 5 are symmetrically arranged along the axis of the ball screw 2. By the arrangement, the square steel plate 6 in the rotary friction mechanism can be uniformly stressed, so that uniform variable friction force is generated.
As shown in fig. 1 and 2, the rotary friction mechanism includes square steel plates 6, circular friction plates 7 and circular steel blocks 8, the screw nut includes a nut head 9 and a nut rod 10 which are integrally formed, the two square steel plates 6 are oppositely arranged on the frame 1, the two circular friction plates 7 are respectively mounted on the two square steel plates 6 and are oppositely arranged, the nut head 9 is located between the two circular friction plates 7, the two circular steel blocks 8 are respectively mounted on two end faces of the nut head 9 and are contacted with the corresponding circular friction plates 7, the nut rod 10 sequentially passes through a central through hole of one circular steel block 8, a central through hole of one circular friction plate 7 and a central through hole of one square steel plate 6, the spring 5 is arranged at one end of the square steel plate 6 far from the circular friction plates 7, and one end of the spring 5 is connected with the square steel plate 6, the other end of the spring 5 is connected with the corresponding T-shaped steel plate 4, and the square steel plate 6, the screw nut and the rack 1 are relatively fixed along the axial direction of the ball screw 2. Two circular ring-shaped steel blocks 8 are respectively arranged on two end faces of the nut head, and the circular ring-shaped steel blocks 8 are respectively contacted with the corresponding circular ring-shaped friction plates 7. When the ball screw 2 moves back and forth along the horizontal direction, the springs on the two sides of the square steel plates 6 are compressed alternately to push the two square steel plates 6 to compress the circular ring-shaped friction plates 7 and the circular ring-shaped steel blocks 8 alternately, so that variable pretightening force is generated between the circular ring-shaped steel blocks 8 and the circular ring-shaped friction plates 7, the circular ring-shaped steel blocks 8 rotate along with the nut heads 9 to rub the circular ring-shaped friction plates 7 which are in contact with each other, and variable friction is realized due to the variable pretightening force to consume energy generated. The larger mass required by frequency modulation damping is realized by arranging the smaller circular ring-shaped steel block 8 (namely the mass block), so that the damper has a good mass amplification effect.
Referring to fig. 2 and 3, in the rotary friction mechanism, the left circular friction plate 7 is vulcanized and fixed on the right end surface of the left square steel plate 6, the right end surface of the left circular friction plate 7 is in contact with the left end surface of the left circular steel block 8, and the right end surface of the left circular steel block 8 is fixed on the left end surface of the nut head 9; the right circular ring-shaped friction plate 7 is vulcanized and fixedly connected to the left end face of the right square steel plate 6, the left end face of the right circular ring-shaped friction plate 7 is in contact with the right end face of the right circular ring-shaped steel block 8, and the left end face of the right circular ring-shaped steel block 8 is fixed to the right end face of the nut head 9. Referring to fig. 2, 3 and 4, the nut rod passes through the central through hole of the left circular ring-shaped steel block 8, the central through hole of the left circular ring-shaped friction plate 7 and the central through hole 22 of the left square steel plate 6. The circular ring-shaped steel block 8, the circular ring-shaped friction plate 7 and the square steel plate 6 are all provided with central through holes, and the nut rod 10 is not in contact with the circular ring-shaped steel block 8, the circular ring-shaped friction plate 7 and the square steel plate 6 and only penetrates through the central through holes.
As shown in fig. 4, the rotary friction mechanism further includes two thrust bearings 11 and a limit steel pipe 12; one of the thrust bearings 11 is mounted in a central through hole 22 of a square steel plate 6 through which a nut rod 10 passes, and the thrust bearing 11 is connected with the square steel plate 6 and the nut rod 10 respectively, the limit steel pipe 12 is fixedly mounted in the central through hole 22 of the other square steel plate 6, one end of the limit steel pipe 12 extends towards the central through hole of the adjacent circular steel block 8, and the other thrust bearing 11 is mounted on one end surface of the limit steel pipe 12 and connected with the nut head 9. The ball screw 2 penetrates through the thrust bearing 11 and the limiting steel pipe 12 from a central through hole of the thrust bearing 11 and a central through hole of the limiting steel pipe 12, the diameters of the central through holes of the thrust bearing 11 and the limiting steel pipe 12 are larger than that of the ball screw 2, and the ball screw 2 is not in contact with the thrust bearing 11 and the limiting steel pipe 12. Through setting up thrust bearing 11 and spacing steel pipe 12, can guarantee that ring shape steel block 8 and screw nut are fixed on ball 2's axis direction, and ring shape steel block 8 and screw nut can not horizontal migration, and ring shape steel block 8 can only follow screw nut and rotate.
Seen from the axial direction of the ball screw 2, the limiting steel tube 12 and the thrust bearing 11 installed on the limiting steel tube 12 are both located in the central through hole of the circular ring-shaped steel block 8 and are not in contact with the circular ring-shaped steel block 8.
The T-shaped steel plate 4 comprises a first vertical plate 13 and a second vertical plate 14; the first vertical plate 13 is slidably mounted on the frame 1, one side surface of the first vertical plate 13 is connected with the spring 5, the second vertical plate 14 is mounted on one side surface of the first vertical plate 13 far away from the spring 5, the second vertical plate 14 is in opposite contact with the corresponding limiting steel plate 3, and the ball screw 2 penetrates through the frame 1, the two first vertical plates 13, the two second vertical plates 14 and the rotary friction mechanism along the horizontal direction. The size of the second vertical plate 14 is matched with that of the limiting steel plate 3, and through the arrangement, energy can be better transmitted.
The frame 1 comprises a bottom plate 15, a cover plate 16 and side plates 17; the two side plates 17 are arranged at intervals, the cover plate 16 is arranged at the top ends of the two side plates 17, the bottom plate 15 is arranged at the bottom ends of the two side plates 17, grooves 18 which are arranged oppositely are formed in the cover plate 16 and the bottom plate 15, the grooves 18 are positioned between the two side plates 17, the rotary friction mechanism is arranged in the grooves 18, the two square steel plates 6 of the rotary friction mechanism are in contact with step walls on two sides of the grooves 18, the cover plate 16 and the bottom plate 15 are provided with slide grooves 19 which are arranged oppositely, the slide grooves 19 are respectively positioned on two sides of the grooves 18 and between the two side plates 17, the T-shaped steel plates 4 are arranged in the corresponding slide grooves 19 in a sliding mode, and the ball screw 2 penetrates through the two side plates 17, the two T-shaped steel plates 4 and the rotary friction mechanism in the horizontal. The slide rail is arranged in the slide way groove 19, and the T-shaped steel plate 4 can slide along the slide rail under the pushing of the limiting steel plate 3, so that the spring 5 is compressed alternately, and the variable pre-tightening force is provided for the rotary friction mechanism. The width of the rotary friction mechanism corresponds to the length of the groove 18, and two square steel plates 6 in the rotary friction mechanism just contact with the step walls on two sides of the groove. Through the arrangement, the two square steel plates 6 cannot move to the outer side of the groove, and the circular ring-shaped steel block 8 and the corresponding circular ring-shaped friction plate 7 are always in a contact state. When no vibration occurs, the spring 5 is in a normal state, and the two T-shaped steel plates 4 are respectively positioned in the respective slide channel grooves 19 and are in contact with the step walls far away from the square steel plate 6 in the slide channel grooves 19. Through the setting, at ball horizontal reciprocating motion's in-process, the spring can not receive tensile, and two square steel sheets only can receive the extrusion force, and can not receive the tensile force, guarantee to realize the running friction between ring shape steel billet 8 and the ring shape friction disc 7, consume the energy that the vibration produced.
The slide channel 19 and the adjacent groove 18 have a certain interval therebetween, and the slide channel 19 and the adjacent side plate 17 have a certain interval therebetween. Through this setting, prevent that T shaped steel plate 4 from in the slip process, the displacement is too big, causes the destruction to spring 5.
As shown in fig. 1, the frame 1 further includes a reinforcing rib 20, one end of the reinforcing rib 20 is connected to one side of the side plate 17 away from the limiting steel plate 3, and the other end of the reinforcing rib 20 is connected to the bottom plate 15. The side plates 17 can be reinforced by arranging the reinforcing ribs 20, and the firmness of the damper is improved.
As shown in fig. 1, the bottom plate 15 is provided with a mounting hole 21 for connecting to a building. The damper can be fixed on a building by arranging the mounting hole 21.
The working principle of the damper is as follows: the ball screw 2 is connected with a building structure, interlayer displacement generated by the building structure pushes the ball screw 2 to enable the ball screw 2 to move horizontally, the limiting steel plate 3 pushes the T-shaped steel plate 4 to compress the spring 5, and positive pressure between the annular friction plate 7 and the annular steel block 8 is increased, so that friction force is increased, and variable friction is realized; the ball screw 2 moves to drive the screw nut to rotate, the screw nut rotates to drive the circular ring-shaped steel block 8 to rotate, the circular ring-shaped steel block 8 and the circular ring-shaped friction plate 7 rub to consume energy, and the accelerated rotation of the screw nut and the circular ring-shaped steel block 8 can dissipate certain energy. Meanwhile, the damper resonates with the structure by adjusting the rigidity of the spring 5, so that the inertia force generated by the annular steel block 8 is reacted to the building structure, and the purpose of structural damping control is achieved.
The utility model discloses a attenuator adopts 6 both sides of square steel sheet to add spring 5 and realizes becoming the friction, when meeting with earthquake, wind vibration effect, and 2 horizontal reciprocating motion of ball through compression spring 5 provide the normal pressure that changes, make the frictional force that produces the change between ring shape steel block 8 and the ring shape friction disc 7, consume the energy of vibration, thereby make the utility model discloses can adapt to the demand of the earthquake of different grades or wind vibration effect effectively. The utility model has good mass amplification effect, and realizes the large mass required by frequency modulation damping by arranging a small mass block; when the initial parameters (the inner diameter and the outer diameter of the circular steel block 8, the screw pitch of the ball screw 2 and the like) are determined, the amplified mass keeps constant, the vibration frequency of the damper can be equal to the self-vibration frequency of the structure by adjusting the rigidity of the spring 5, so that resonance occurs, and the inertia force generated by the circular steel block 8 counteracts the building structure to block the vibration of the building structure.
The above-mentioned specific implementation is the preferred embodiment of the present invention, can not be right the utility model discloses the limit, any other does not deviate from the technical scheme of the utility model and the change or other equivalent replacement modes of doing all contain within the scope of protection of the utility model.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021348742.0U CN212271290U (en) | 2020-07-10 | 2020-07-10 | A frequency-modulated rotating mass variable friction damper |
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| CN202021348742.0U CN212271290U (en) | 2020-07-10 | 2020-07-10 | A frequency-modulated rotating mass variable friction damper |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779149A (en) * | 2020-07-10 | 2020-10-16 | 广州大学 | A frequency-modulated rotating mass variable friction damper |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779149A (en) * | 2020-07-10 | 2020-10-16 | 广州大学 | A frequency-modulated rotating mass variable friction damper |
| CN111779149B (en) * | 2020-07-10 | 2024-11-01 | 广州大学 | Variable friction damper with frequency modulation rotating mass |
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