Variable friction damping unit for vibration isolation bearing, vibration isolation bearing, and working method

Abstract

The application provides a variable friction damping unit for a vibration reduction support, a vibration reduction support and a working method. The damping effect generated by the variable friction damping unit is continuously changed, sudden collision of the support and the limiting block can be avoided, the structural movement is slowly controlled, and the working performance of the vertical vibration reduction support is improved. The moving friction rod is provided with a right-handed threaded rod and a left-handed threaded rod; the upper rotating friction rod is in threaded connection with the right-handed threaded rod; when the upper rotating friction rod rotates on the right-handed threaded rod through threads, the upper rotating friction rod and the moving friction rod are in clutch type cooperation to eliminate or generate friction damping between the upper rotating friction rod and the moving friction rod; the lower rotating friction rod is in threaded connection with the left-handed threaded rod; when the lower rotating friction rod rotates on the left-handed threaded rod through threads, the lower rotating friction rod and the moving friction rod are in clutch type cooperation to eliminate or generate friction damping between the lower rotating friction rod and the moving friction rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering structure vibration reduction and isolation control technology, in particular to a variable friction damping unit for a vibration reduction and isolation support, a vibration reduction and isolation support and a working method, which is suitable for vibration reduction and isolation of industrial and civil buildings, equipment, instruments and the like. BACKGROUND

[0002] Vibration problems of adjacent buildings caused by subway, high-speed rail and the like environmental vibration have a huge impact on the safety of the structure and internal non-structural objects of the building, equipment function and human comfort. In particular, with the increase of train operating speed of high-speed rail and the like, the vibration impact is more intense.

[0003] In order to reduce the impact of subway, high-speed rail and the like environmental vibration, domestic and foreign researchers have widely carried out research on structure vibration reduction and isolation technology, developed vertical vibration reduction and isolation supports based on thick layer rubber, disc spring, steel spiral spring and air spring and the like materials and elements, and applied the technology in some projects, which has achieved good vibration reduction and isolation effect. For example, as shown in the Chinese patent with the application number CN202411842912.3 and the name of a multi-directional vibration reduction and isolation support. The vertical vibration reduction and isolation supports have a vibration reduction and isolation frequency mainly concentrated in 3-8Hz. This frequency band has a large coincidence probability with the main vibration frequency of seismic motion, which may cause resonance effect, and in extreme cases, the displacement of the vertical vibration reduction and isolation support may exceed the limit, affecting the safety of the support and the structure.

[0004] In order to avoid damage to the support, a limiting block is usually provided in the vertical vibration reduction and isolation support. However, under the action of earthquake, the support and the limiting block are prone to sudden collision, which may cause problems such as excessive local acceleration and stress of the structure, and even may cause damage to the support. SUMMARY

[0005] The present application aims to overcome the above-mentioned deficiencies in the prior art, and provides a variable friction damping unit for a vibration reduction and isolation support, a vibration reduction and isolation support and a working method with reasonable structure design, which can avoid sudden collision of the support and the limiting block, so as to solve the defects in the above background technology.

[0006] The technical solution adopted by the present application to solve the above problems is:

[0007] The variable friction damping unit for the vibration isolation support comprises a moving friction rod and a rotating friction rod assembly, and the rotating friction rod assembly comprises an upper rotating friction rod and a lower rotating friction rod; the moving friction rod is provided with a right-handed threaded rod and a left-handed threaded rod; the upper rotating friction rod is threadedly connected with the right-handed threaded rod, and when the upper rotating friction rod rotates on the right-handed threaded rod through the thread, the upper rotating friction rod and the moving friction rod are in clutching type cooperation to eliminate or generate friction damping between the upper rotating friction rod and the moving friction rod; the lower rotating friction rod is threadedly connected with the left-handed threaded rod, and when the lower rotating friction rod rotates on the left-handed threaded rod through the thread, the lower rotating friction rod and the moving friction rod are in clutching type cooperation to eliminate or generate friction damping between the lower rotating friction rod and the moving friction rod.

[0008] Further, the upper rotating friction rod is provided with an upper rotating friction surface, the moving friction rod is provided with a rear friction surface, and the rear friction surface cooperates with the upper rotating friction surface; the lower rotating friction rod is provided with a lower rotating friction surface, and the moving friction rod is provided with a front friction surface, and the front friction surface cooperates with the lower rotating friction surface.

[0009] Further, the lower end of the upper rotating friction rod is provided with an upper rotating threaded hole, and the upper rotating threaded hole is threadedly connected with the right-handed threaded rod; the upper end of the lower rotating friction rod is provided with a lower rotating threaded hole, and the lower rotating threaded hole is threadedly connected with the left-handed threaded rod.

[0010] Further, in a normal case, gaps are left between the rear friction surface and the upper rotating friction surface and between the front friction surface and the lower rotating friction surface.

[0011] Further, the rotating friction rod assembly is a pair of assemblies, which are arranged on the left and right sides of the moving friction rod respectively; the left and right ends of the moving friction rod are provided with the right-handed threaded rod and the left-handed threaded rod; in the left rotating friction rod assembly, the upper rotating threaded hole is threadedly connected with the right-handed threaded rod at the left end of the moving friction rod, and the lower rotating threaded hole is threadedly connected with the left-handed threaded rod at the left end of the moving friction rod; in the right rotating friction rod assembly, the upper rotating threaded hole is threadedly connected with the right-handed threaded rod at the right end of the moving friction rod, and the lower rotating threaded hole is threadedly connected with the left-handed threaded rod at the right end of the moving friction rod.

[0012] The vibration isolation support comprises a vertical vibration isolation unit, the vertical vibration isolation unit comprises a vertical vibration isolation element, a mounting top plate and a mounting bottom plate, and the upper and lower ends of the vertical vibration isolation element are connected with the mounting top plate and the mounting bottom plate; the variable friction damping unit is further comprised; the upper end of the upper rotating friction rod is hingedly mounted on the mounting top plate, and the lower end is threadedly connected with the right-handed threaded rod; the lower end of the lower rotating friction rod is hingedly mounted on the mounting bottom plate, and the upper end is threadedly connected with the left-handed threaded rod.

[0013] Further, the rotating friction rod assembly of the present application further comprises an upper lug plate and a lower lug plate, the upper lug plate is fixed on the mounting top plate, and the lower lug plate is fixed on the mounting top plate; the upper end of the upper rotating friction rod is hingedly mounted on the upper lug plate, and the lower end of the lower rotating friction rod is hingedly mounted on the lower lug plate.

[0014] Further, the upper end of the upper rotating friction rod of the present application is provided with an upper rotating pin hole, the upper lug plate is provided with an upper lug plate pin hole, and the upper rotating pin hole and the upper lug plate pin hole are connected through a pin.

[0015] Further, the lower end of the lower rotating friction rod of the present application is provided with a lower rotating pin hole, the lower lug plate is provided with a lower lug plate pin hole, and the lower rotating pin hole and the lower lug plate pin hole are connected through a pin.

[0016] The working method of the vibration reduction and isolation support, characterized in that it comprises the following processes:

[0017] (1) In a normal situation:

[0018] When the vertical vibration reduction and isolation unit produces a small upward vertical displacement, the upper rotating friction rod rotates counterclockwise, the right-handed threaded rod is screwed into the upper rotating threaded hole, but the screwing amount is small, the upper rotating friction rod and the moving friction rod are in a separated or small degree of joint state, so the pressure between the rear friction surface and the upper rotating friction surface is 0 or small, thereby realizing 0 or small rotating friction force; at this time, the lower rotating friction rod rotates clockwise, the left-handed threaded rod is screwed out of the lower rotating threaded hole, but the screwing amount is small, the lower rotating friction rod and the moving friction rod are in a separated state, there is no pressure between the front friction surface and the lower rotating friction surface, and the rotating friction force is 0.

[0019] When the vertical vibration reduction and isolation unit produces a small downward vertical displacement, the upper rotating friction rod rotates clockwise, the right-handed threaded rod is screwed out of the upper rotating threaded hole, but the screwing amount is small, the upper rotating friction rod and the moving friction rod are in a separated state, so there is no pressure between the rear friction surface and the upper rotating friction surface, and the rotating friction force is 0; at this time, the lower rotating friction rod rotates counterclockwise, the left-handed threaded rod is screwed into the lower rotating threaded hole, but the screwing amount is small, the lower rotating friction rod and the moving friction rod are in a separated or small degree of joint state, the pressure between the front friction surface and the lower rotating friction surface is 0 or small, thereby realizing 0 or small rotating friction force.

[0020] (2) Under the action of an earthquake:

[0021] When the vertical vibration isolation unit generates a larger upward vertical displacement, the upper rotating friction rod rotates counterclockwise, the right-handed threaded rod is screwed into the upper rotating threaded hole, but the screwing amount is larger, the upper rotating friction rod and the moving friction rod are in a connected state, so that a larger pressure is generated between the rear friction surface and the upper rotating friction surface, thereby realizing a larger rotating friction force; at this time, the lower rotating friction rod rotates clockwise, the left-handed threaded rod is screwed out of the lower rotating threaded hole, but the screwing amount is larger, the lower rotating friction rod and the moving friction rod are in a separated state, no pressure is generated between the front friction surface and the lower rotating friction surface, and the rotating friction force is 0.

[0022] When the vertical vibration isolation unit generates a larger downward vertical displacement, the upper rotating friction rod rotates clockwise, the right-handed threaded rod is screwed out of the upper rotating threaded hole, but the screwing amount is larger, the upper rotating friction rod and the moving friction rod are in a separated state, so that no pressure is generated between the rear friction surface and the upper rotating friction surface, and the rotating friction force is 0; at this time, the lower rotating friction rod rotates counterclockwise, the left-handed threaded rod is screwed into the lower rotating threaded hole, but the screwing amount is larger, the lower rotating friction rod and the moving friction rod are in a connected state, a larger pressure is generated between the front friction surface and the lower rotating friction surface, thereby realizing a larger rotating friction force.

[0023] Compared with the prior art, the present application has the following advantages and effects:

[0024] 1. The variable friction damping unit design endows the vertical vibration isolation bearing with a unique variable friction function.

[0025] Under the action of environmental vibration such as subway and high-speed rail, the displacement of the vertical vibration isolation bearing is small, at this time, the smaller the friction damping is, the better the vibration isolation effect is; under the action of earthquake, the displacement of the vertical vibration isolation bearing is large, at this time, the larger the friction damping is, the more can avoid the damage caused by the too large displacement of the bearing. The traditional friction damping generally has a constant friction surface pressure, when applied to the vertical vibration isolation bearing, the friction force characteristics of the bearing under small displacement and large displacement are similar, and the friction damping demand under the action of environmental vibration such as subway and high-speed rail and under the action of earthquake cannot be met at the same time.

[0026] The variable friction damping unit design of the present application endows the vertical vibration isolation bearing with a unique variable friction function, as shown in Figure 1 when the displacement of the bearing is small, the friction damping is small, which is suitable for vibration isolation under the action of environmental vibration such as subway and high-speed rail; when the displacement of the bearing is large, the friction damping is large, which is suitable for reducing the displacement of the bearing under the action of earthquake and protecting the bearing.

[0027] 2、Traditional vertical vibration isolation support generally uses limiting block to limit excessive deformation of vibration isolation support under earthquake. However, when the limiting block is used, the support and the limiting block are prone to sudden collision, resulting in excessive local acceleration and stress of the structure and even damage to the support. The damping effect of the variable friction damping unit is continuously changed, which can avoid the sudden collision of the support and the limiting block, thereby slowly controlling the structure movement and improving the working performance of the vertical vibration isolation support.

[0028] 3、The traditional friction damping unit mainly uses a fixed length bolt rod to fix multiple friction plates, and the pressure between the friction plates is constant. The variable friction damping unit of the present application is provided with a threaded hole with internal thread on the upper rotating friction rod and the lower rotating friction rod, which directly matches the bolt rod on the moving friction rod, and as the vibration isolation support moves, the bolt rod on the moving friction rod is screwed into or out of the upper rotating friction rod and the lower rotating friction rod, thereby changing the pressure and rotational friction between the friction plates.

[0029] 4、The bolt rod of the moving friction rod connected to the upper rotating friction rod of the variable friction damping unit adopts right-handed thread, and the bolt rod of the moving friction rod connected to the lower rotating friction rod of the variable friction damping unit adopts left-handed thread, thereby realizing bidirectional variable damping effect. When the angle between the upper rotating friction rod and the moving friction rod of the variable friction damping unit increases, the pressure between them increases, and the rotational friction increases; when the angle between the upper rotating friction rod and the moving friction rod of the variable friction damping unit decreases, the pressure between them decreases, and the rotational friction decreases. When the angle between the lower rotating friction rod and the moving friction rod of the variable friction damping unit increases, the pressure between them decreases, and the rotational friction decreases; when the angle between the lower rotating friction rod and the moving friction rod of the variable friction damping unit decreases, the pressure between them increases, and the rotational friction increases. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Comparison chart of traditional friction damping and variable friction damping;

[0031] Figure 2 Structure diagram of the first vertical vibration isolation unit disclosed in the embodiment of the present application;

[0032] Figure 3 Structure diagram of the second vertical vibration isolation unit disclosed in the embodiment of the present application;

[0033] Figure 4 Structure diagram of the vertical vibration isolation unit disclosed in the embodiment of the present application;

[0034] Figure 5 Structure diagram of the variable friction damping unit disclosed in the embodiment of the present application;

[0035] Figure 6The structural schematic diagram of the mobile friction rod disclosed by the embodiment of the present application is shown in the figure.

[0036] Figure 7 The structural schematic diagram of the upper rotating friction rod and the lower rotating friction rod disclosed by the embodiment of the present application is shown in the figure.

[0037] Figure 8 The local connection schematic diagram of the upper rotating friction rod, the mounting top plate, the mobile friction rod and the lower rotating friction rod disclosed by the embodiment of the present application is shown in the figure.

[0038] Figure 9 The schematic diagram of the adjusting bolt pre-tightening degree variable friction damping vertical vibration reduction and isolation bearing disclosed by the embodiment of the present application applied to the building structure is shown in the figure. DETAILED DESCRIPTION

[0039] The present application will be further described in detail below with reference to the accompanying drawings and by embodiments, and the following embodiments are an explanation of the present application and the present application is not limited to the following embodiments.

[0040] I. Please refer to Figure 2 The adjusting bolt pre-tightening degree variable friction damping vertical vibration reduction and isolation bearing of the embodiment of the present application comprises a vertical vibration reduction and isolation unit 10 and a variable friction damping unit 20; the variable friction damping unit 20 is a plurality of units and is arranged at the periphery of the vertical vibration reduction and isolation unit 10; in the embodiment, the variable friction damping unit 20 is four units.

[0041] Please refer to Figures 2 to 4 The vertical vibration reduction and isolation unit 10 comprises a vertical vibration reduction and isolation element 101, a mounting top plate 102 and a mounting bottom plate 103.

[0042] The mounting top plate 102 and the mounting bottom plate 103 are both quadrilaterals. The vertical vibration reduction and isolation element 101 comprises an elastic element 1011 and a connecting end plate 1012, the connecting end plate 1012 is fixedly arranged at both ends of the elastic element 1011, and the upper and lower ends of the vertical vibration reduction and isolation element 101 are connected with the mounting top plate 102 and the mounting bottom plate 103 by welding, bolt connection or the like. The vertical vibration reduction and isolation unit 10 mainly plays a vertical vibration reduction and isolation function, and it is the main functional component of the vertical vibration reduction and isolation of the present application. In the working process of the vertical vibration reduction and isolation bearing, the vibration reduction and isolation function is realized by the expansion and contraction of the elastic element 1011, and the expansion and contraction direction is consistent with the working direction of the vertical vibration reduction and isolation bearing. In the normal state, due to the dead weight of the upper structure, the elastic element 1011 is in a compressed state. As shown in the figure, in the actual application, the elastic element 1011 can be a steel coil spring or a thick layer rubber bearing. In order to meet the vertical vibration reduction and isolation requirement, a plurality of elastic elements 1011 can be arranged to jointly play the vibration reduction and isolation function, of course, according to the site condition, only one elastic element 1011 can also be arranged. Figure 4

[0043] ​Referring to Figures 2-5 , the variable friction damping unit 20 includes a moving friction rod 201 and a rotating friction rod assembly, which includes an upper rotating friction rod 202, a lower rotating friction rod 204, an upper ear plate 203 and a lower ear plate 205. The mounting top plate 102, the mounting bottom plate 103 and the variable friction damping unit 20 are all made of steel.

[0044] Referring to Figure 6 , the moving friction rod 201 is fixed with a right-handed threaded rod 2011 and a left-handed threaded rod 2012 at both left and right ends, and is provided with a rear friction surface 2013 and a front friction surface 2014 at both left and right ends.

[0045] The upper ear plate 203 is fixed at the bottom edge of the mounting top plate 102, and the lower ear plate 205 is fixed at the top edge of the mounting bottom plate 103; both the upper ear plate 203 and the lower ear plate 205 are double-plate structures, and the upper ear plate 203 is provided with an upper ear plate pin shaft hole 2031, and the lower ear plate 205 is provided with a lower ear plate pin shaft hole 2051.

[0046] Referring to Figure 7 , the upper end of the upper rotating friction rod 202 is provided with an upper rotating pin shaft hole 2021, the lower end is provided with an upper rotating threaded hole 2022, and the periphery of the upper rotating threaded hole 2022 is provided with an upper rotating friction surface 2023. The upper end of the lower rotating friction rod 204 is provided with a lower rotating threaded hole 2042, the lower end is provided with a lower rotating pin shaft hole 2041, and the periphery of the lower rotating threaded hole 2042 is provided with a lower rotating friction surface 2043.

[0047] Referring to Figures 2 to 7 , the upper rotating pin shaft hole 2021 and the upper ear plate pin shaft hole 2031 are connected by an upper pin shaft 2032, so that the upper end of the upper rotating friction rod 202 is hingedly mounted on the upper ear plate 203, and further hingedly mounted on the mounting top plate 102; the lower rotating pin shaft hole 2041 and the lower ear plate pin shaft hole 2051 are connected by a lower pin shaft 2052, so that the lower end of the lower rotating friction rod 204 is hingedly mounted on the lower ear plate 205, and further hingedly mounted on the mounting bottom plate 103.

[0048] The rotating friction rod assembly is a pair, which is respectively arranged at the left and right sides of the moving friction rod 201. In the left rotating friction rod assembly, the upper rotating threaded hole 2022 is threadedly connected with the right-handed threaded rod 2011 at the left end of the moving friction rod 201, and the lower rotating threaded hole 2042 is threadedly connected with the left-handed threaded rod 2012 at the left end of the moving friction rod 201. Similarly, in the right rotating friction rod assembly, the upper rotating threaded hole 2022 is threadedly connected with the right-handed threaded rod 2011 at the right end of the moving friction rod 201, and the lower rotating threaded hole 2042 is threadedly connected with the left-handed threaded rod 2012 at the right end of the moving friction rod 201.

[0049] The lower end of the upper rotating friction rod 202 is in clutching cooperation with the moving friction rod 201, that is, when the upper rotating friction rod 202 is rotated on the right-handed threaded rod 2011 through the upper rotating threaded hole 2022, the lower end of the upper rotating friction rod 202 can be separated from or engaged with the moving friction rod 201 to eliminate or generate the frictional damping between the upper rotating friction rod 202 and the moving friction rod 201. The upper end of the lower rotating friction rod 204 is in clutching cooperation with the moving friction rod 201, that is, when the upper end of the lower rotating friction rod 204 is rotated on the left-handed threaded rod 2012 through the lower rotating threaded hole 2042, the upper end of the lower rotating friction rod 204 can be separated from or engaged with the moving friction rod 201 to eliminate or generate the frictional damping between the lower rotating friction rod 204 and the moving friction rod 201. The rear friction surface 2013 cooperates with the upper rotating friction surface 2023, and the upper rotating friction rod 202 is separated from or engaged with the moving friction rod 201 by separating or engaging the rear friction surface 2013 from the upper rotating friction surface 2023. The front friction surface 2014 cooperates with the lower rotating friction surface 2043, and the lower rotating friction rod 204 is separated from or engaged with the moving friction rod 201 by separating or engaging the front friction surface 2014 from the lower rotating friction surface 2043.

[0050] Please refer to Figure 8 In a normal case, a certain gap 30 is left between the rear friction surface 2013 and the upper rotating friction surface 2023 and between the front friction surface 2014 and the lower rotating friction surface 2043. The gap 30 is provided to ensure that the frictional damping between the rear friction surface 2013 and the upper rotating friction surface 2023 and between the front friction surface 2014 and the lower rotating friction surface 2043 is 0 when the small amplitude subway, high-speed rail and other environmental vibrations occur, and to adapt to the movement space required by the upper rotating friction rod 202 and the lower rotating friction rod 204 when the right-handed threaded rod 2011 and the left-handed threaded rod 2012 are screwed into or out of the upper rotating threaded hole 2022 and the lower rotating threaded hole 2042, respectively. The size of the gap 30 needs to be designed according to the actual vibration control target. After the upper lug plate 203 and the lower lug plate 205 are connected to the upper rotating friction rod 202 and the lower rotating friction rod 204, respectively, a certain gap 30 is also left between the plates, so that the frictional damping between the plates is 0.

[0051] In a further preferred embodiment, according to the damping design requirements, the rear friction surface 2013, the front friction surface 2014, the upper rotating friction surface 2023 and the lower rotating friction surface 2043 can be fixed with friction materials of different properties as required.

[0052] Please refer to Figure 9The vertical vibration reduction and isolation support with adjustable bolt pre-tightening degree and variable frictional damping disclosed by the embodiment of the application is applied to the bottom of a building structure 40 to achieve vibration control under the action of environmental vibration such as subway and high-speed rail vibration. Under the action of the self weight of the building structure, the vertical vibration reduction and isolation unit 10 and the variable frictional damping unit 20 are in a balanced position.

[0053] II. The working method of the vibration reduction and isolation support, comprising the following processes:

[0054] (1) Please refer to Figures 2 to 9 Under the action of environmental vibration such as subway and high-speed rail vibration in a normal case, when the vertical vibration reduction and isolation unit 10 generates a small upward vertical displacement from the balanced position under the action of the self weight of the building structure, the upper rotating frictional rod 202 rotates counterclockwise, a small angle change is generated between the upper rotating frictional rod 202 and the moving frictional rod 201, the right-handed threaded rod 2011 is screwed into the upper rotating threaded hole 2022, but the screwing amount is small, the upper rotating frictional rod 202 and the moving frictional rod 201 are in a separated or small degree of joint state, so the pressure between the rear frictional surface 2013 and the upper rotating frictional surface 2023 is 0 or small, thereby realizing 0 or small rotating frictional force; at this time, the lower rotating frictional rod 204 rotates clockwise, a small angle change is also generated between the lower rotating frictional rod 204 and the moving frictional rod 201, the left-handed threaded rod 2012 is screwed out of the lower rotating threaded hole 2042, but the screwing amount is small, at this time, the lower rotating frictional rod 204 and the moving frictional rod 201 are in a separated state, there is no pressure between the front frictional surface 2014 and the lower rotating frictional surface 2043, and the rotating frictional force is 0.

[0055] Under the action of environmental vibration such as subway and high-speed rail vibration in a normal case, when the vertical vibration reduction and isolation unit 10 generates a small downward vertical displacement from the balanced position under the action of the self weight of the building structure, the upper rotating frictional rod 202 rotates clockwise, a small angle change is generated between the upper rotating frictional rod 202 and the moving frictional rod 201, the right-handed threaded rod 2011 is screwed out of the upper rotating threaded hole 2022, but the screwing amount is small, the upper rotating frictional rod 202 and the moving frictional rod 201 are in a separated state, so there is no pressure between the rear frictional surface 2013 and the upper rotating frictional surface 2023, and the rotating frictional force is 0; at this time, the lower rotating frictional rod 204 rotates counterclockwise, a small angle change is also generated between the lower rotating frictional rod 204 and the moving frictional rod 201, the left-handed threaded rod 2012 is screwed into the lower rotating threaded hole 2042, but the screwing amount is small, at this time, the lower rotating frictional rod 204 and the moving frictional rod 201 are in a separated or small degree of joint state, the pressure between the front frictional surface 2014 and the lower rotating frictional surface 2043 is 0 or small, thereby realizing 0 or small rotating frictional force.

[0056] (2) under the action of earthquake, when the vertical vibration isolation unit 10 generates a large upward vertical displacement from the balance position under the action of the dead weight of the building structure, the upper rotating friction rod 202 rotates counterclockwise, a large angle change is generated between the upper rotating friction rod 202 and the moving friction rod 201, the right-handed threaded rod 2011 is screwed into the upper rotating threaded hole 2022, but the screwed-in amount is large, the upper rotating friction rod 202 and the moving friction rod 201 are in a large degree of engagement state, so a large pressure is generated between the rear friction surface 2013 and the upper rotating friction surface 2023, thereby realizing a large rotating friction force; at this time, the lower rotating friction rod 204 rotates clockwise, a large angle change is also generated between the lower rotating friction rod 204 and the moving friction rod 201, the left-handed threaded rod 2012 is screwed out of the lower rotating threaded hole 2042, but the screwed-out amount is large, at this time, the lower rotating friction rod 204 and the moving friction rod 201 are in a separated state, no pressure is generated between the front friction surface 2014 and the lower rotating friction surface 2043, and the rotating friction force is 0.

[0057] under the action of earthquake, when the vertical vibration isolation unit 10 generates a large downward vertical displacement from the balance position under the action of the dead weight of the building structure, the upper rotating friction rod 202 rotates clockwise, a large angle change is generated between the upper rotating friction rod 202 and the moving friction rod 201, the right-handed threaded rod 2011 is screwed out of the upper rotating threaded hole 2022, but the screwed-out amount is large, the upper rotating friction rod 202 and the moving friction rod 201 are in a separated state, so no pressure is generated between the rear friction surface 2013 and the upper rotating friction surface 2023, and the rotating friction force is 0; at this time, the lower rotating friction rod 204 rotates counterclockwise, a large angle change is also generated between the lower rotating friction rod 204 and the moving friction rod 201, the left-handed threaded rod 2012 is screwed into the lower rotating threaded hole 2042, but the screwed-in amount is large, at this time, the lower rotating friction rod 204 and the moving friction rod 201 are in a large degree of engagement state, a large pressure is generated between the front friction surface 2014 and the lower rotating friction surface 2043, thereby realizing a large rotating friction force.

[0058] The principles and implementation manners of the present application are described by using specific examples in the present application, the above description of the examples is only used to help understand the method of the present application and its core idea; meanwhile, according to the idea of the present application, the specific implementation manners and application ranges will be changed by the general technical personnel in the field. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A variable friction damping unit for vibration isolation bearings, characterized in that: The system includes a movable friction rod and a rotating friction rod assembly. The rotating friction rod assembly includes an upper rotating friction rod and a lower rotating friction rod. The movable friction rod is provided with a right-hand threaded rod and a left-hand threaded rod. The upper rotating friction rod is threadedly connected to the right-hand threaded rod. When the upper rotating friction rod rotates on the right-hand threaded rod, it engages with the movable friction rod in a clutch-like manner to eliminate or generate frictional damping between the two rods. The lower rotating friction rod is threadedly connected to the left-hand threaded rod. When the lower rotating friction rod rotates on the left-hand threaded rod, it engages with the movable friction rod in a clutch-like manner to eliminate or generate frictional damping between the two rods. The upper rotating friction rod has an upper rotating friction surface, and the movable friction rod has a rear friction surface that engages with the upper rotating friction surface. The lower rotating friction rod has a lower rotating friction surface. The friction surfaces include a front friction surface on the movable friction rod, which mates with the lower rotating friction surface; the lower end of the upper rotating friction rod has an upper rotating threaded hole that is threadedly connected to a right-hand threaded rod; the upper end of the lower rotating friction rod has a lower rotating threaded hole that is threadedly connected to a left-hand threaded rod; the rotating friction rod assemblies are a pair, respectively located on the left and right sides of the movable friction rod; both ends of the movable friction rod have a right-hand threaded rod and a left-hand threaded rod; in the left-hand rotating friction rod assembly, the upper rotating threaded hole is threadedly connected to the right-hand threaded rod at the left end of the movable friction rod, and the lower rotating threaded hole is threadedly connected to the left-hand threaded rod at the left end of the movable friction rod; in the right-hand rotating friction rod assembly, the upper rotating threaded hole is threadedly connected to the right-hand threaded rod at the right end of the movable friction rod, and the lower rotating threaded hole is threadedly connected to the left-hand threaded rod at the right end of the movable friction rod.

2. The variable friction damping unit for vibration reduction and isolation bearings according to claim 1, characterized in that: Under normal circumstances, there are gaps between the rear friction surface and the upper rotating friction surface, and between the front friction surface and the lower rotating friction surface.

3. A vibration damping and isolation support, comprising a vertical vibration isolation unit, the vertical vibration isolation unit comprising a vertical vibration isolation element, a mounting top plate and a mounting bottom plate, the upper and lower ends of the vertical vibration isolation element being connected to the mounting top plate and the mounting bottom plate, characterized in that: It also includes the variable friction damping unit as described in claim 1 or 2; the upper end of the upper rotating friction rod is hinged to the mounting top plate, and the lower end is threaded to a right-hand threaded rod; the lower end of the lower rotating friction rod is hinged to the mounting base plate, and the upper end is threaded to a left-hand threaded rod.

4. The vibration damping and isolation bearing according to claim 3, characterized in that: The rotating friction rod assembly further includes an upper ear plate and a lower ear plate. The upper ear plate is fixed on the mounting top plate, and the lower ear plate is fixed on the mounting top plate. The upper end of the upper rotating friction rod is hinged to the upper ear plate, and the lower end of the lower rotating friction rod is hinged to the lower ear plate.

5. The vibration damping and isolation support according to claim 4, characterized in that: The upper end of the upper rotating friction rod is provided with an upper rotating pin hole, and the upper ear plate is provided with an upper ear plate pin hole. The upper rotating pin hole and the upper ear plate pin hole are connected by a pin.

6. The vibration damping and isolation support according to claim 4, characterized in that: The lower end of the lower rotating friction rod is provided with a lower rotating pin hole, and the lower ear plate is provided with a lower ear plate pin hole. The lower rotating pin hole and the lower ear plate pin hole are connected by a pin.

7. The working method of the vibration damping and isolation bearing according to any one of claims 3-6, characterized in that: The process includes the following: (1) Under normal circumstances: When the vertical vibration damping unit generates a small upward vertical displacement, the upper rotating friction rod rotates counterclockwise, and the right-hand threaded rod is screwed into the upper rotating threaded hole, but the screwing amount is small. The upper rotating friction rod and the moving friction rod are in a separated or slightly engaged state, so the pressure between the rear friction surface and the upper rotating friction surface is 0 or small, thus achieving 0 or small rotational friction force. At this time, the lower rotating friction rod rotates clockwise, and the left-hand threaded rod is screwed out of the lower rotating threaded hole, but the screwing amount is small. The lower rotating friction rod and the moving friction rod are in a separated state, and there is no pressure between the front friction surface and the lower rotating friction surface, so the rotational friction force is 0. When the vertical vibration damping unit generates a small downward vertical displacement, the upper rotating friction rod rotates clockwise, and the right-hand threaded rod is screwed out of the upper rotating threaded hole, but the screwing amount is small. The upper rotating friction rod and the moving friction rod are in a separated state, so there is no pressure between the rear friction surface and the upper rotating friction surface, and the rotational friction force is zero. At this time, the lower rotating friction rod rotates counterclockwise, and the left-hand threaded rod is screwed into the lower rotating threaded hole, but the screwing amount is small. The lower rotating friction rod and the moving friction rod are in a separated or slightly engaged state, and the pressure generated between the front friction surface and the lower rotating friction surface is zero or small, thereby achieving zero or small rotational friction force. (2) Under earthquake action: When the vertical vibration damping unit generates a large upward vertical displacement, the upper rotating friction rod rotates counterclockwise, and the right-hand threaded rod is screwed into the upper rotating threaded hole, but the screwing amount is large. The upper rotating friction rod and the moving friction rod are in an engaged state, so a large pressure is generated between the rear friction surface and the upper rotating friction surface, thus achieving a large rotational friction force. At this time, the lower rotating friction rod rotates clockwise, and the left-hand threaded rod is screwed out of the lower rotating threaded hole, but the screwing amount is large. The lower rotating friction rod and the moving friction rod are in a separated state, and there is no pressure between the front friction surface and the lower rotating friction surface, so the rotational friction force is 0. When the vertical vibration damping unit generates a large downward vertical displacement, the upper rotating friction rod rotates clockwise, and the right-hand threaded rod is screwed out of the upper rotating threaded hole, but the screwing amount is large. The upper rotating friction rod and the moving friction rod are in a separated state, so there is no pressure between the rear friction surface and the upper rotating friction surface, and the rotational friction force is 0. At this time, the lower rotating friction rod rotates counterclockwise, and the left-hand threaded rod is screwed into the lower rotating threaded hole, but the screwing amount is large. The lower rotating friction rod and the moving friction rod are in an engaged state, and a large pressure is generated between the front friction surface and the lower rotating friction surface, thereby achieving a large rotational friction force.

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