Variable-friction-coefficient sliding shock isolation device with limiting function

Abstract

The invention belongs to the technical field of seismic isolation, and discloses a variable friction coefficient sliding seismic isolation device with a limiting function, which comprises a ring beam, a sliding area is arranged at the bottom of the ring beam, the sliding area comprises a first ceramsite layer, and the first ceramsite layer is arranged at the bottom of the ring beam; the second ceramsite layers are symmetrically arranged on the two sides of the first ceramsite layer, and the particle size of the second ceramsite layers is smaller than that of the first ceramsite layer; the third ceramsite layers are symmetrically arranged on the two sides of the second ceramsite layer; the rubber pier is arranged on the outer side of the third ceramsite layer and used for limiting sliding displacement of the ring beam, the oil tank is arranged on the ring beam, and engine oil in the oil tank is sprayed on ceramsite to change the friction coefficient of the ceramsite; according to the scheme, the change of the friction coefficient is achieved by arranging the ceramsite with the particle size from large to small, and the problems that in the prior art, the ring beam is difficult to slide due to the fact that the friction coefficient of materials is too large, the shock isolation effect is weak, the ring beam sliding displacement is too large due to the small friction coefficient, and a shock isolation device is not limited are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of seismic isolation, and specifically relates to a variable friction coefficient sliding seismic isolation device with a limiter. Background Art

[0002] Seismic isolation technology is a method used in construction projects to reduce the impact of earthquakes on buildings. Its basic principle is to set up a seismic isolation layer between the foundation and the superstructure of the building, so that it is difficult for the earthquake energy to be directly transmitted to the superstructure, reducing the damage to the building.

[0003] Sliding isolation is a type of seismic isolation technology, which is achieved by setting a sliding isolation layer between the foundation and the superstructure of the building. When an earthquake occurs, the ground movement will cause the structure to produce horizontal displacement. The sliding isolation layer, through its sliding characteristics, causes the structure to slide horizontally on the isolation layer to a certain extent, rather than a rigid connection. The sliding action absorbs and dissipates part of the earthquake energy, reduces the impact and vibration on the superstructure, thereby reducing the inertial force on the structure and improving the seismic performance of the building.

[0004] Referring to the existing document with the publication (announcement) number CN105887667A, a variable friction isolation bearing is disclosed. The bottom surface of the friction sliding block on the isolation bearing is provided with a friction surface of a special shape. These friction surfaces are defined by even-order curve equations, such as quadratic or quartic function equations, to form a specific profile. When the friction sliding block slides in both directions, horizontally or vertically, on the friction layer on the top of the lower connecting plate, due to the curve shape of the friction surface, the contact area will change with the change of displacement, so that the friction force can be adjusted according to the change of displacement, thereby achieving the effect of a variable friction coefficient. As the displacement increases, the contact area between the friction surfaces increases, resulting in a corresponding increase in friction, thereby achieving a damping effect that changes with the displacement.

[0005] Although the seismic isolation bearing that uses a specific contour surface to achieve a variable friction coefficient can adjust the friction force according to the displacement change to provide a better damping effect, this method that relies on the change of geometric shape to adjust the friction force may cause the friction surface contour to be distorted due to material wear or deformation during long-term use, affecting the control of friction force changes and reducing the stability of the seismic isolation effect. Secondly, the design of the contour surface is highly complex and difficult to process, which increases the manufacturing cost and maintenance difficulty. Summary of the invention

[0006] The purpose of this solution is to provide a variable friction coefficient sliding isolation device with a limiter to solve the problem of inconsistent friction coefficient caused by material wear in the prior art.

[0007] In order to achieve the above object, the present invention provides a variable friction coefficient sliding isolation device with limit, comprising a ring beam, a sliding zone is provided at the bottom of the ring beam, and the sliding zone includes: A first ceramsite layer, wherein the first ceramsite layer is arranged at the bottom of the ring beam; A second ceramsite layer, wherein the second ceramsite layer is symmetrically arranged on both sides of the first ceramsite layer, and the particle size of the second ceramsite layer is smaller than that of the first ceramsite layer; The third ceramsite layer is symmetrically arranged on both sides of the second ceramsite layer, and the particle size of the third ceramsite layer is smaller than that of the second ceramsite layer.

[0008] The principle of this scheme is: the ring beam is made into a convex shape, the protruding part of the ring beam is the sliding contact surface, and the foundation position corresponding to the protruding part is arranged with expanded clay particles with particle sizes from large to small from the middle to the two ends to realize an increase in the friction coefficient from small to large. The increase in the friction coefficient increases the consumed seismic energy. Its purpose is that the greater the displacement of the structure under the action of an earthquake, the greater the seismic force required. Compared with the sliding layer with a smaller friction coefficient, the sliding displacement of the system is smaller. Compared with the sliding layer with a larger friction coefficient, the seismic force required for the initial sliding of the system is smaller, and the sliding layer is easier to enter the working state and play a seismic isolation role.

[0009] The effects of this scheme are as follows: (1) The friction coefficient of the sliding zone is variable. The sliding zone is divided according to the friction coefficient. Different sliding zones have different friction coefficients. The friction coefficient gradually increases from the inside to the outside. Compared with the sliding layer with a smaller friction coefficient, the sliding displacement of the system is smaller. Compared with the sliding layer with a larger friction coefficient, the initial sliding of the system requires a smaller seismic force. The sliding layer is easier to enter the working state and play a role of seismic isolation. (2) The movement of the ring beam will cause the ceramsite in contact with it to wear. This wear will change the surface roughness and contact area of ​​the ceramsite, thereby affecting the friction coefficient. Generally, the surface of new ceramsite is rougher and has a larger friction coefficient, while the surface of the ceramsite after wear becomes smoother, the contact area may decrease, and the friction coefficient decreases accordingly. However, when the upper layer of ceramsite is worn, its volume and weight decrease. Under the vibration of the earthquake, these lightweight worn ceramsite will be pushed by the earthquake force, so that the worn ceramsite in the upper layer moves down to the lower layer due to gravity and vibration, while the unworn or less worn ceramsite in the lower layer rises to the upper layer, thereby ensuring the consistency of the friction coefficient of the sliding zone.

[0010] Furthermore, a partition is provided between the first ceramsite layer, the second ceramsite layer and the third ceramsite layer.

[0011] The principle and effect of this solution is to prevent the ceramsite in each ceramsite layer from mixing with each other due to earthquake vibration.

[0012] Furthermore, it also includes a rubber pier arranged outside the third ceramsite layer.

[0013] The principle and effect of this solution are: limiting the moving distance of the ring beam, and the elastic characteristics of the rubber pier can also absorb and buffer the impact of the ring beam.

[0014] Furthermore, it also includes an oil tank arranged on the ring beam, the oil outlet of the oil tank is provided with a rubber plug, and the rubber plug falls off after the oil tank collides with the rubber pier.

[0015] The principle and effect of this scheme are as follows: (1) Because the ceramsite may be slightly worn under the compression and shearing state, the friction coefficient increases, and the lubrication function is achieved through the oil tank. When the oil tank collides with the rubber pier, the rubber plug falls off, causing the oil in the oil tank to flow out from the oil outlet and as the ring beam slides, the oil drips onto the friction surface of the ceramsite, thereby reducing the friction coefficient and further reducing the sliding resistance. (2) Under the action of earthquake vibration, the shaking of the ceramsite layer also helps the oil to better penetrate and distribute to the contact points between the ceramsites, achieving a more uniform lubrication effect.

[0016] Furthermore, the oil tank includes a first oil tank, a one-way valve is provided on the first oil tank, the first oil tank is an oil tank made of a flexible material, and the first oil tank is arranged in cooperation with a rubber pier.

[0017] The principle and effect of this solution is that when the ring beam slides and causes the first oil tank to collide with the rubber pier, the first oil tank is deformed to generate pressure inside the first oil tank, thereby pushing the oil out of the one-way valve and causing the oil to flow onto the ceramsite friction surface. The above arrangement avoids the problem that the ring beam does not move to the rubber pier, but causes the oil tank rubber plug to fall off due to the vibration of the earthquake.

[0018] Furthermore, it also includes a second oil tank, which is connected to the first oil tank through a one-way valve. A baffle and a piston are provided in the second oil tank. The piston is slidably connected to the inner wall of the second oil tank. The piston is connected to a spring. The free end of the spring is connected to the baffle. The one-way valve is provided between the baffle and the piston. The second oil tank is provided with an oil outlet.

[0019] The principle and effect of this scheme are as follows: (1) After the first oil tank is squeezed by the rubber pier, the oil flows into the space enclosed by the baffle, the inner wall of the second oil tank and the piston, and flows out from the oil outlet and onto the ceramsite friction surface. When the amount of oil flowing in increases, it will push the piston upward and stretch the spring. After the ring beam moves in the opposite direction, the second oil tank loses the squeeze of the rubber pier, and the spring drives the piston to reset, thereby squeezing the oil in the enclosed space and causing it to flow out from the oil outlet. (2) The speed and amount of oil outflow are controlled by the baffle, piston and spring. When the first oil tank is squeezed by the rubber pier, the oil flows into the enclosed space and flows out from the oil outlet. As the piston moves upward due to the increase of oil and stretches the spring, after losing the squeeze of the rubber pier, the force of the spring drives the piston to reset and continues to push the oil out, thereby achieving a continuous lubrication effect. This not only avoids the excessive oil outflow speed caused by sudden pressure changes, but also ensures the continuous outflow of oil during the repeated movement of the ring beam.

[0020] Furthermore, the baffle is penetrated by an oil outlet pipe, the oil inlet end of the oil outlet pipe is arranged between the baffle and the piston, and the oil outlet end is arranged outside the second oil tank, the oil inlet end of the oil outlet pipe is smaller than the oil outlet end of the oil outlet pipe, a ball valve is arranged in the oil outlet pipe, the diameter of the ball valve is larger than the diameter of the oil inlet end and smaller than the diameter of the oil outlet end, the ball valve is connected to an elastic rope, and the free end of the elastic rope is connected to the piston.

[0021] The principle and effect of this scheme are as follows: (1) When the first oil tank collides with the rubber pier, since the ring beam has not moved back, if the oil in the oil tank flows out at this time, it will cause the oil to contact the ceramsite friction surface prematurely. At this time, the ring beam has not moved, so the oil cannot effectively cover and lubricate the entire sliding area, resulting in oil waste. Therefore, the internal oil should be allowed to flow out after the first oil tank is squeezed and before it is squeezed. (2) When the first oil tank is squeezed, the oil flows into the enclosed space of the baffle, the inner wall of the first oil tank and the piston, and pushes the piston to move upward, driving the ball valve to move through the elastic rope, so that the ball valve closes the oil inlet end of the oil outlet pipe, so that the oil in the chamber does not flow out. When the first oil tank loses its squeeze, the piston is reset under the drive of the spring, and the elastic rope drives the ball valve to reset, so that the oil outlet pipe and the enclosed space are in a connected state, and the oil flows out at this time. (3) By setting up a ball valve and an elastic rope, the engine oil will not flow out before the ring beam slides. Only when the collision and extrusion are relieved and the ring beam starts to move back, the piston will reset under the action of the spring, driving the ball valve to open, and the engine oil will flow out from the oil outlet pipe. At this time, the ring beam is moving, and the engine oil can evenly cover and lubricate the entire sliding area, giving full play to the lubrication effect and avoiding the waste of engine oil.

[0022] Furthermore, the oil outlet pipe is rotatably connected to the baffle plate, and a section of the oil outlet pipe between the baffle plate and the piston is provided with blades.

[0023] The principle and effect of this scheme are as follows: (1) After the oil in the enclosed space is squeezed, the blades start to rotate, so that the oil flowing out of the oil outlet pipe is sprayed around the ceramsite layer under the action of centrifugal force. (2) The centrifugal force generated by the rotation of the blades can make the oil spraying range wider and more uniform.

[0024] Furthermore, an inclined oil injection pipe is provided at the oil outlet end of the oil outlet pipe, and the oil injection pipe is connected to the oil outlet pipe.

[0025] The principle and effect of this solution are as follows: the inclined fuel injection pipe makes the flow direction of the engine oil form a certain angle with the oil outlet pipe, generating an additional component force along the outlet direction of the fuel injection pipe. Under the action of centrifugal force, this component force makes the engine oil spray out at a wider projection angle, thereby increasing the flight distance of the engine oil, allowing the engine oil to cover a farther expanded clay layer area, ensuring uniform distribution of the lubricant.

[0026] Furthermore, a slide groove is provided in the second oil tank, and the piston is slidably connected to the slide groove.

[0027] The principle and effect of this solution are that the slide groove provides positioning and guidance for the up and down movement of the piston, thereby preventing dislocation during the movement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a variable friction coefficient sliding isolation device with limiter of the present invention; Figure 2 It is a schematic diagram of the internal structure of the oil tank of the present invention.

[0029] The figure marks in the drawings of the specification include: ring beam 1, sliding zone 2, first ceramsite layer 21, second ceramsite layer 22, third ceramsite layer 23, rubber pier 3, oil tank 4, first oil tank 41, one-way valve 42, second oil tank 43, baffle 44, piston 45, oil outlet pipe 46, ball valve 47, elastic rope 48, blade 49. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the concept and technical effects of the present invention in combination with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention: Embodiment 1: See also Figure 1A variable friction coefficient sliding isolation device with a limit, comprising a ring beam 1 and a sliding zone 2 arranged at the bottom of the ring beam 1, wherein the sliding zone 2 comprises a first ceramsite layer 21, a second ceramsite layer 22 and a third ceramsite layer 23. The first ceramsite layer 21 is arranged directly below the ring beam 1, the number of the second ceramsite layers 22 is two, and the two second ceramsite layers 22 are symmetrically arranged on both sides of the first ceramsite layer 21, the number of the third ceramsite layers 23 is two, and the two third ceramsite layers 23 are symmetrically arranged on both sides of the second ceramsite layer 22; the first ceramsite layer 21 is coarse-grained ceramsite, and the corresponding particle size is greater than 5 mm; the second ceramsite layer 22 is medium-grained ceramsite, and the corresponding particle size is between 2.5 and 5 mm; the third ceramsite 23 is fine-grained ceramsite, and the corresponding particle size is less than 2.5 mm. In order to ensure that the ceramsite in the first ceramsite layer 21, the second ceramsite layer 22 and the third ceramsite layer 23 will not mix, a partition is arranged between each ceramsite layer.

[0031] The ring beam 1 is made into a convex shape, and the protruding part of the ring beam 1 is a sliding contact surface. The basic position corresponding to the protruding part is arranged from the middle to the two ends with ceramsite of particle size from large to small to achieve an increase in friction coefficient from small to large. The increase in friction coefficient increases the seismic energy consumed. The purpose is that the greater the displacement of the structure under the action of the earthquake, the greater the seismic force required. Compared with the sliding layer with a smaller friction coefficient, the sliding displacement of the system is smaller, and the seismic force required for the initial sliding of the system is smaller than that of the sliding layer with a larger friction coefficient. The sliding zone 2 is easier to enter the working state and play a role of seismic isolation. During an earthquake, the movement of the ring beam 1 will cause the ceramsite in contact with it to wear, and this wear will change the surface roughness and contact area of ​​the ceramsite, thereby affecting the friction coefficient of the ceramsite. Usually, the surface of new ceramsite is relatively rough and has a larger friction coefficient, while the surface of the ceramsite after wear becomes relatively smooth, the contact area may be reduced, and the friction coefficient is reduced accordingly. However, when the upper layer of expanded clay is worn, its volume and weight are reduced. Under the vibration of the earthquake, these lightweight and worn expanded clay will be pushed by the earthquake force, causing the worn expanded clay in the upper layer to move down to the lower layer due to gravity and vibration, while the unworn or less worn expanded clay in the lower layer rises to the upper layer, thereby ensuring that the friction coefficient of the sliding zone 2 is consistent.

[0032] In order to limit the moving distance of the ring beam 1, two rubber piers 3 are symmetrically arranged on the sliding zone 2, which are made of multiple layers of waste rubber (such as waste tires). At the same time, the elastic characteristics of the rubber piers 3 can also absorb and buffer the impact of the ring beam 1. It also includes an oil tank 4 symmetrically arranged on the ring beam 1, and the oil outlet of the oil tank 4 is provided with a rubber plug. After the oil tank 4 collides with the rubber pier 3, the rubber plug falls off. Because the ceramsite may be slightly worn under the compression and shearing state, the friction coefficient increases. The ceramsite is lubricated by pouring oil on the ceramsite through the oil tank 4. When the oil tank 4 collides with the rubber pier 3, the rubber plug on the oil tank 4 falls off, so that the engine oil in the oil tank 4 flows out from the oil outlet and as the ring beam 1 slides, the engine oil pours onto the friction surface of the ceramsite, thereby reducing the friction coefficient and further reducing the sliding resistance. At the same time, under the action of earthquake vibration, the shaking of the ceramsite layer also helps the engine oil to better penetrate and distribute to the contact points between the ceramsites, achieving a more uniform lubrication effect.

[0033] Embodiment 2: The oil tank 4 mentioned in the previous embodiment is to cause the oil in the oil tank 4 to flow out by the rubber plug falling off. When the ring beam 1 moves to conflict with the rubber pier 3, it may not move back. At this time, the oil can only lubricate the third ceramsite layer 23 in the vicinity of the rubber pier 3, and cannot lubricate the remaining ceramsite layers. At the same time, since the oil in the oil tank 4 flows naturally, there is no buffering and delaying effect, which causes the oil to flow out quickly, and the lubrication effect on the ceramsite layer in the sliding zone 2 is not good. Therefore, this embodiment makes further improvements to the oil tank 4 in Example 1.

[0034] See also Figure 2The difference between this embodiment and the previous embodiment is that the oil tank 4 is not provided with a rubber plug. The oil tank 4 includes a first oil tank 41, on which a one-way valve 42 is provided. The first oil tank 41 is made of an air bag or other flexible material, and is filled with organic oil. A second oil tank 43 is provided on the left side of the first oil tank 41, and the second oil tank 43 is connected to the first oil tank 41 through the one-way valve 42. A baffle 44 and a piston 45 are provided in the second oil tank 43. A slide groove matching the piston 45 is provided in the second oil tank 43. The piston 45 is slidably connected to the slide groove to provide positioning and guiding functions for the up and down movement of the piston 45 to avoid dislocation of the piston 45 during the movement process. The piston 45 is slidably connected to the inner wall of the second oil tank 43. The piston 45 is connected to a spring, and the free end of the spring is linked to the baffle 44. The one-way valve 42 is provided on the baffle. 44 and the piston 45 are enclosed in a hollow chamber formed by; the baffle 44 is penetrated by an oil outlet pipe 46, and the oil outlet pipe 46 is rotatably connected to the baffle 44, the oil inlet end of the oil outlet pipe 46 is arranged between the baffle 44 and the piston 45, and the oil outlet end is arranged outside the second oil tank 43, the oil outlet end of the oil outlet pipe 46 is symmetrically provided with inclined injection pipes 410, the injection pipes 410 are communicated with the oil outlet pipe 46, a section of the oil outlet pipe 46 located between the baffle 44 and the piston 45 is provided with blades 49, the oil inlet end of the oil outlet pipe 46 is smaller than the oil outlet end of the oil outlet pipe 46, a ball valve 47 is arranged in the oil outlet pipe 46, the diameter of the ball valve 47 is larger than the diameter of the oil inlet end and smaller than the diameter of the oil outlet end, the ball valve 47 is connected to the elastic rope 48, and the free end of the elastic rope 48 is connected to the piston 45.

[0035] When the ring beam 1 slides and causes the first oil tank 41 to collide with the rubber pier 3, the first oil tank 41 is deformed and pressure is generated inside the first oil tank 41, thereby pushing the engine oil out of the one-way valve 42, and the engine oil flows into the chamber surrounded by the baffle 44, the inner wall of the second oil tank 43 and the piston 45. When the amount of engine oil flowing in increases, the piston 45 will be pushed upward and the spring will be stretched. The upward movement of the piston 45 will drive the ball valve 47 to move through the elastic rope 48, so that the ball valve 47 closes the oil inlet end of the oil outlet pipe 46, so that the oil in the chamber does not flow out. When the first oil tank 41 loses its squeeze, the piston 45 is reset under the drive of the spring, and the elastic rope 48 drives the ball valve 47 to reset, and the oil outlet pipe 46 is in a connected state with the enclosed chamber, and the engine oil flows out at this time. At the same time, after the oil in the enclosed chamber is squeezed, the blades 49 begin to rotate, so that the oil flowing out through the oil outlet pipe 46 is sprayed around the expanded clay layer under the action of centrifugal force. When the oil flows to the inclined oil injection pipe 410, the flow direction of the oil forms a certain angle with the oil outlet pipe 46, generating an additional component force along the outlet direction of the oil injection pipe 410. Under the action of centrifugal force, this component force causes the oil to be sprayed at a wider projection angle, thereby increasing the flight distance of the oil and allowing the oil to cover a farther expanded clay layer area.

[0036] Embodiment 3: In the previous embodiments (embodiment 1 and embodiment 2), the sliding isolation device is arranged at the bottom of the ring beam 1, and the ring beam 1 is a convex ring beam 1. The difference between this embodiment and the previous embodiment is that the sliding isolation device is arranged at the bottom of the load-bearing column to form a sliding isolation unit under the column.

[0037] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A variable friction coefficient sliding seismic isolation device with a limiter, comprising a ring beam (1), wherein a sliding zone (2) is provided at the bottom of the ring beam (1), characterized in that: The slip zone (2) comprises: A first ceramsite layer (21), wherein the first ceramsite layer (21) is arranged at the bottom of the ring beam (1); A second ceramsite layer (22), the second ceramsite layer (22) being symmetrically arranged on both sides of the first ceramsite layer (21), and the particle size of the second ceramsite layer (22) being smaller than that of the first ceramsite layer (21); A third ceramsite layer (23), the third ceramsite layer (23) being symmetrically arranged on both sides of the second ceramsite layer (22), and the particle size of the third ceramsite layer (23) being smaller than that of the second ceramsite layer (22).

2. The variable friction coefficient sliding isolation device with limiter according to claim 1 is characterized in that: A partition is provided between the first ceramsite layer (21), the second ceramsite layer (22) and the third ceramsite layer (23).

3. The variable friction coefficient sliding isolation device with limiter according to claim 1, characterized in that: It also includes a rubber pier (3) arranged outside the third ceramsite layer (23).

4. The variable friction coefficient sliding isolation device with limiter according to claim 3 is characterized in that: It also includes an oil tank (4) arranged on the ring beam (1), wherein the oil outlet of the oil tank (4) is provided with a rubber plug, and the rubber plug falls off after the oil tank (4) collides with the rubber pier (3).

5. The variable friction coefficient sliding isolation device with limiter according to claim 4, characterized in that: The oil tank (4) comprises a first oil tank (41), a one-way valve (42) is provided on the first oil tank (41), the first oil tank (41) is an oil tank made of a flexible material, and the first oil tank (41) is arranged in cooperation with the rubber pier (3).

6. The variable friction coefficient sliding isolation device with limiter according to claim 5, characterized in that: The invention also comprises a second oil tank (43), wherein the second oil tank (43) is connected to the first oil tank (41) via a one-way valve (42), a baffle (44) and a piston (45) are provided in the second oil tank (43), the piston (45) is slidably connected to the inner wall of the second oil tank (43), the piston (45) is connected to a spring, the free end of the spring is connected to the baffle (44), the one-way valve (42) is provided between the baffle (44) and the piston (45), and the second oil tank (43) is provided with an oil outlet.

7. The variable friction coefficient sliding isolation device with limiter according to claim 6, characterized in that: The baffle plate (44) is provided with an oil outlet pipe (46). The oil inlet end of the oil outlet pipe (46) is provided between the baffle plate (44) and the piston (45), and the oil outlet end is provided outside the second oil tank (43). The oil inlet end of the oil outlet pipe (46) is smaller than the oil outlet end of the oil outlet pipe (46). A ball valve (47) is provided in the oil outlet pipe (46). The diameter of the ball valve (47) is larger than the diameter of the oil inlet end and smaller than the diameter of the oil outlet end. The ball valve (47) is connected to an elastic rope (48), and the free end of the elastic rope (48) is connected to the piston (45).

8. The variable friction coefficient sliding isolation device with limiter according to claim 7, characterized in that: The oil outlet pipe (46) is rotatably connected to the baffle plate (44), and a section of the oil outlet pipe (46) between the baffle plate (44) and the piston (45) is provided with blades (49).

9. The variable friction coefficient sliding isolation device with limiter according to claim 8, characterized in that: An inclined oil injection pipe (410) is provided at the oil outlet end of the oil outlet pipe (46), and the oil injection pipe (410) is in communication with the oil outlet pipe (46).

10. The variable friction coefficient sliding isolation device with limiter according to claim 8, characterized in that: A slide groove is provided in the second oil tank (43), and the piston (45) is slidably connected to the slide groove.

Images