Vibration collaborative protection base suitable for fragile cultural relics and forming method of vibration collaborative protection base

Abstract

The invention discloses a vibration collaborative protection base suitable for fragile cultural relics and a forming method thereof.The protection base can be arranged between building indoor cultural relic products and a ground foundation or can be arranged between building foundation frame columns, and the protection base comprises a steel spring support used for isolating vertical micro-vibration caused by rail transit, and a steel spring supporting seat used for supporting the steel spring support; the steel spring support can be connected to a ground foundation; the viscous dampers are arranged on the inner sides of the steel spring supports in parallel to provide additional damping and cooperate with the steel spring supports to cooperatively reduce vertical strong earthquakes caused by earthquakes; the friction pendulum support is arranged on the upper side of the steel spring support in series and used for isolating ground horizontal strong vibration or floor horizontal strong vibration caused by earthquakes, the friction pendulum support can be connected with a box cabinet of cultural relic products, and when the protection base is formed, the installation environment and actual requirements need to be considered, so that the vibration reduction effect of the friction pendulum support is exerted to the maximum extent. The device adapts to environment vibration caused by earthquakes and / or rail transit, and cultural relic products are protected against toppling and damage.

Description

Technical Field

[0001] This invention belongs to the field of shockproof protection technology for cultural relics, specifically relating to a shock-resistant and vibration-coordinated protection base for fragile cultural relics and its molding method. Background Technology

[0002] With the large-scale construction and operation of subway lines, the environmental vibration impact generated by subway train operation has become increasingly prominent and apparent. Environmental vibration has become a major factor restricting land development around subways. In order to ensure the various functional needs of sensitive buildings such as residences, schools, and hospitals, buildings near subway developments must first address the environmental vibration impact during the subway operation period.

[0003] The need for vertical and horizontal vibration control in museums and their collections of fragile artifacts in high-seismic-intensity areas is becoming increasingly urgent.

[0004] The vibration impact of subways is primarily vertical, with frequencies mainly concentrated in the 20-80Hz range. Foundation isolation involves installing elastic vibration isolation elements in the building foundation, between building floors, or at the base of the foundation. This lowers the vertical natural frequency of the "building-elastic element" isolation system, thus controlling high-frequency subway vibrations. The lower the vertical natural frequency of the isolated building, the better the vibration control effect on the subway environment. Typically, the design natural frequency of buildings isolated with steel spring vibration isolation supports can be as low as 3-5Hz, while the design natural frequency of buildings isolated with foundation elastic pads can be as low as below 7Hz. While the elastic elements significantly reduce the vertical stiffness of the protected object, improving vertical vibration isolation efficiency, they also negatively impact its stability and resistance to horizontal loads. In particular, point-supported steel spring vibration isolation support systems pose structural stability and safety risks.

[0005] Compared to the vibrations in the subway environment, the seismic load is much larger and the damage is mainly caused by horizontal seismic loads. Therefore, the vibration isolation system with very low vertical stiffness is more prone to structural damage when subjected to large horizontal seismic loads, thus reducing its seismic performance.

[0006] In summary, the vertical environmental vibration control of subways for fragile cultural relics in museums in high seismic intensity areas contradicts the horizontal seismic design. The foundation isolation technology used for subway vibration control is not conducive to the horizontal seismic design, while the foundation isolation technology used to resist seismic loads cannot solve the impact of vertical environmental vibrations in subways. Therefore, it is very important to carry out research on "vibration-seismic synergistic protection" technology that meets the coupling effect of normal subway environmental vibrations and occasional horizontal seismic loads.

[0007] Therefore, how to provide a vibration-assisted protective base for fragile cultural relics and its molding method is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a vibration-coordinated protection base for fragile cultural relics and its molding method, which can realize the separation of vibration control functions for strong horizontal vibration, weak vertical vibration and strong vertical vibration and the decoupling of vibration control design objectives.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a vibration-coordinated protection base for fragile cultural relics, which can be installed between the cultural relic product and the ground foundation in a building, or between the foundation frame columns of a building, comprising:

[0010] A steel spring support is used to isolate vertical micro-vibrations caused by rail transit, and the steel spring support can be connected to a ground foundation; A viscous damper is connected in parallel to the inner side of the steel spring support to provide additional damping and work in conjunction with the steel spring support to reduce the vertical strong earthquake caused by the earthquake. A friction pendulum support is connected in series on the upper side of the steel spring support and is used to isolate strong horizontal ground vibrations or strong horizontal floor vibrations caused by earthquakes. The friction pendulum support can be connected to the cabinets of cultural relics.

[0011] The beneficial effects of this invention are as follows: the steel spring support can isolate weak vertical environmental vibrations (such as constant vertical micro-vibrations caused by the operation of nearby rail transit lines); the steel spring support and the viscous damper are connected in parallel to synergistically suppress strong vertical vibrations under strong earthquakes, so as to avoid the impact of vertical vibrations on the protected fragile cultural relics during earthquakes; a friction pendulum support is connected in series on the upper side of the steel spring support to isolate strong horizontal ground vibrations or strong horizontal floor vibrations caused by strong earthquakes, so as to prevent fragile cultural relics from being overturned and damaged due to strong horizontal shaking; this invention achieves coordinated protection of vertical and lateral vibrations under the influence of constant environmental factors such as earthquakes and rail transit through the series and parallel connection of multiple vibration isolation devices.

[0012] Preferably, the steel spring support includes a first support plate, a second support plate, a steel spring assembly, a first guide sleeve, and a second guide sleeve. The first support plate and the second support plate are arranged parallel to each other at an interval. The upper side of the first support plate can be connected to the friction pendulum support, and the lower side of the second support plate can be connected to the ground foundation. The viscous damper is located in the middle between the first support plate and the second support plate. Multiple steel spring arrays of the steel spring assembly are distributed between the first support plate and the second support plate and are located on the periphery of the viscous damper. Each steel spring has a first guide sleeve and a second guide sleeve on its outer periphery. The first guide sleeve and the second guide sleeve are fixedly connected to the first support plate and the second support plate respectively and slide inward and outward.

[0013] The resulting technical effect is that the multiple steel springs of the steel spring assembly work together to bear the vertical load, and the first guide sleeve and the second guide sleeve ensure the vertical displacement guidance of the first support plate and the second support plate, and can also bear the lateral force of the friction pendulum support, thus improving the overall integrity of the protective base.

[0014] Preferably, the first support plate has an inverted conical guide rod hole in the middle, the guide rod head of the viscous damper is a conical head and is adapted to be connected to the guide rod hole, the second support plate has a positioning step hole in the middle, the cylinder seat of the viscous damper is adapted to be located in the positioning step hole, and there is a downward pressure buffer distance between the top of the cylinder of the viscous damper and the first support plate.

[0015] The resulting technical effects are: the inverted conical guide rod hole of the first support plate can better connect the guide rod of the viscous damper, and the positioning stepped hole of the second support plate can fix and position the cylinder seat of the viscous damper, thereby realizing the stable installation and energy dissipation of the viscous damper between the first support plate and the second support plate.

[0016] Preferably, the first support plate is provided with a plurality of bolt holes for connecting the friction pendulum support, and the second support plate is provided with a plurality of perforated ear plates fixed on its periphery, the perforated ear plates being connected to the ground foundation by fasteners.

[0017] The resulting technical effect is that the first support plate is designed to connect to the friction pendulum support, namely, with bolt holes, and the second support plate is designed to connect to the ground foundation, namely, with perforated lugs, to ensure the reliable fixed installation of related accessories.

[0018] Preferably, the friction pendulum support includes an upper support plate, a lower support plate, a spherical crown liner, and a sliding plate. The bottom side of the upper support plate and the top side of the lower support plate are provided with spherical recesses. The corresponding spherical recesses of the upper and lower support plates are provided with spherical stainless steel plates. The upper and lower sides of the spherical crown liner are respectively provided with grooves. There are two sets of sliding plates, which are respectively embedded in the grooves. The sliding plates slide in contact with the spherical stainless steel plates. The profiles of the sliding plates are respectively adapted to the spherical recesses and the profiles of the spherical stainless steel plates.

[0019] The resulting technical effect is that by using the spherical socket-shaped surfaces on the upper and lower support plates in conjunction with the sliding plate on the spherical crown liner, a sliding curved surface is constructed. The purpose is to isolate and buffer lateral vibrations, thereby ensuring that cultural relics are not affected by lateral vibrations.

[0020] Preferably, a modified ultra-high molecular weight polyethylene layer is applied to the surface of the skateboard near the spherical stainless steel plate, resulting in a coefficient of friction of 0.05 between the skateboard and the spherical stainless steel plate.

[0021] The resulting technical benefits are: the modified ultra-high molecular weight polyethylene layer on the skateboard reduces the coefficient of friction, while the spherical stainless steel plate also improves the service life of related accessories.

[0022] Preferably, both the upper support plate and the lower support plate are provided with multiple perforated lugs on their periphery. The upper support plate is connected to the cabinet of the cultural relics through the perforated lugs and fasteners, and the lower support plate is connected to the steel spring support through the perforated lugs and fasteners.

[0023] The resulting technical effect is that the perforated lugs on the upper and lower support plates and the connecting bolts can reliably connect with the relevant accessories.

[0024] This invention also discloses a molding method for a vibration-assisted protective base for fragile cultural relics, which includes the following steps: Step 1: Calculate the technical parameters of relevant components based on the installation environment and actual needs, including the steel spring parameters of the steel spring support, the damping coefficient of the viscous damper, and the dynamic friction coefficient of the friction pendulum support. Step 2: Based on Step 1, select appropriate assembly parts for the steel spring support, viscous damper, and friction pendulum support. Step 3: Assemble the steel spring support assembly parts from Step 2, assemble the friction pendulum support assembly parts, and assemble the assembled steel spring support with the viscous damper. On this basis, connect the assembled friction pendulum support with connecting bolts. Step 4: Install the protective base formed in Step 3 between the ground foundation and the cabinet of cultural relics or between the building foundation frame columns using connecting bolts.

[0025] The beneficial technical effects of this invention are as follows: Since the protective base involves multiple vibration damping devices, these devices are affected by the installation environment and actual requirements. That is, the technical parameters of the relevant vibration damping devices need to be designed and determined. Then, the relevant steel spring supports and viscous dampers are assembled. On this basis, a friction pendulum support is formed by connecting bolts. The protective base of this invention can be used between the cabinets of cultural relics and the ground foundation, and can also be extended to be used between the frame columns of building foundations.

[0026] Preferably, in step one, based on the target of strong horizontal earthquake isolation, the horizontal isolation period T of the friction pendulum bearing is determined, and the equivalent radius of curvature R and the dynamic friction coefficient of the spherical socket surface of the friction pendulum bearing are calculated, R=(T / 2π). 2 ×g; T is the oscillation period of the friction pendulum support, and g is the gravitational acceleration; The stiffness of the steel spring is determined based on the vertical vibration isolation frequency of the environment. The vertical load that each steel spring needs to bear is determined based on the design bearing capacity. Then, the stiffness of the steel spring is determined based on the target vertical frequency, k = m × f. 2m is the vertical load that each steel spring needs to bear, and f is the frequency. The damping of the viscous damper is set based on the vibration reduction capacity of the steel spring support. The optimal damping ratio of the viscous damper is 5%-10%.

[0027] The resulting technical effect is that the technical parameters of the relevant vibration damping devices need to be designed and determined according to external influences, so as to ensure the synergistic vibration damping effect of the protective base in the environment (vibration generated by earthquakes and conventional rail transit).

[0028] Preferably, in step three, before the friction pendulum support is assembled, it is necessary to test the technical parameters and parameter accuracy of the relevant accessories, including the radius of curvature, profile, and mirror finish of the ball socket surface, as well as the surface accuracy, profile, and mirror finish of the sliding plate, in order to ensure the operating performance of the friction pendulum support.

[0029] The resulting technical effect is that, since the friction pendulum support has high precision requirements for the assembly accessories, it is necessary to verify and determine the relevant technical parameters and precision before assembly in order to ensure the subsequent operation performance of the friction pendulum support. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a vibration-coordinated protection base for fragile cultural relics according to the present invention; Figure 2 This is a schematic diagram of a friction pendulum support for a vibration-coordinated protection base for fragile cultural relics according to the present invention; Figure 3 This is a top view of a friction pendulum support for a vibration-coordinated protection base for fragile cultural relics according to the present invention; Figure 4 This is a top view of a steel spring support for a shock-resistant and vibration-coordinated protection base for fragile cultural relics according to the present invention; Figure 5 for Figure 4 AA cross-section view; Figure 6 for Figure 4 BB cross-section; Figure 7 This is a schematic diagram of the first support plate of a vibration-coordinated protection base for fragile cultural relics according to the present invention; Figure 8 This is a schematic diagram of the second support plate of a vibration-coordinated protection base for fragile cultural relics according to the present invention; Figure 9 This is a schematic diagram of a viscous damper for a shock-resistant and vibration-coordinated protection base for fragile cultural relics according to the present invention.

[0031] 1. Steel spring support; 11. First support plate; 12. Second support plate; 13. Steel spring assembly; 14. First guide sleeve; 15. Second guide sleeve; 16. Guide rod hole; 17. Positioning step hole; 18. Bolt hole; 19. Ear plate with hole; 2. Viscous damper; 3. Friction pendulum support; 31. Upper support plate; 32. Lower support plate; 33. Spherical crown liner; 34. Slide plate; 35. Spherical stainless steel plate; 4. Connecting bolts. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] See the appendix of this invention. Figures 1 to 9 According to an embodiment of the present invention, a vibration-coordinated protection base for fragile cultural relics is provided, which can be installed between the cultural relic product and the ground foundation in a building, or between the foundation frame columns of a building, comprising: Steel spring support 1 is used to isolate small vertical vibrations caused by rail transit. Under normal conditions, the vertical vibrations caused by rail transit are small, generally between 0.1mm and 3mm. Steel spring support 1 can be connected to the ground foundation. Viscous damper 2 is connected in parallel to the inside of steel spring support 1 to provide additional damping, and works with steel spring support 1 to reduce the vertical strong shock caused by earthquake. The two together can isolate the vertical flutter caused by earthquake, which is usually greater than 1cm. It should be noted that the damper provides damping and its core function is to reduce vibration, while the steel spring support is for vibration isolation. Together, they can reduce vibration. The damper has no effect during micro-vibrations because the displacement is small, but it will work during large earthquakes.

[0034] Friction pendulum support 3 is connected in series on the upper side of steel spring support 1 and is used to isolate strong horizontal ground vibration or strong horizontal floor vibration caused by earthquake. Friction pendulum support 3 can connect the cabinet of cultural relics to prevent fragile cultural relics from tipping over and being damaged due to strong horizontal shaking. The protective base of this product can simultaneously isolate strong vertical vibration loads and lateral vibration loads, so that the relevant cultural relics are not affected by vibration (earthquake, rail transit and other constant environmental vibrations).

[0035] In other embodiments, the steel spring support 1 includes a first support plate 11, a second support plate 12, a steel spring assembly 13, a first guide sleeve 14, and a second guide sleeve 15. The first support plate 11 and the second support plate 12 are arranged parallel to each other at intervals and are made of Q355 steel. They are square in shape. The upper side of the first support plate 11 can be connected to the friction pendulum support 3, and the lower side of the second support plate 12 can be connected to the ground foundation. The viscous damper 2 is located in the middle between the first support plate 11 and the second support plate 12. The four steel spring arrays of the steel spring assembly 13 are distributed between the first support plate 11 and the second support plate 12 and are located on the periphery of the viscous damper 2. Each steel spring has a first guide sleeve 14 and a second guide sleeve 15 on its outer periphery. The first guide sleeve 14 and the second guide sleeve 15 are fixedly connected to the first support plate 11 and the second support plate 12 respectively and slide inward and outward. The first guide sleeve and the second guide sleeve can coaxially undergo relative displacement.

[0036] The steel spring material is 50CrVA (SAE 6150) or equivalent or higher performance oil-quenched and tempered alloy spring steel; its tensile strength σ b ≥1500MPa, using heat treatment process, namely quenching + medium temperature tempering, to obtain high elastic limit and toughness; surface treatment adopts shot peening treatment, a key process, to improve the fatigue life of small winding ratio springs; manufacturing requirements include both ends being tightly closed and ground flat at ≥270°, end surface roughness Ra≤12.5μm, and ensuring perpendicularity.

[0037] The main dimensions of the steel spring are: wire diameter d = 25.0 mm, spring mean diameter D = 130.0 mm (±1%), effective number of coils n = 4 coils, total number of coils nt = 6 coils, free height H0 = 190 mm (±2%), and compression height H. b ≈150mm, stiffness k=450N / mm(±5%).

[0038] The first guide sleeve 14 and the second guide sleeve 15 are both 120mm long and are made of Q355 steel.

[0039] In some other specific embodiments, the first support plate 11 has an inverted conical guide rod hole 16 in the middle, the guide rod head of the viscous damper 2 is a conical head and is adapted to be connected to the guide rod hole 16, the second support plate 12 has a positioning step hole 17 in the middle, the cylinder seat of the viscous damper 2 is adapted to be fixed in the positioning step hole 17, and there is a downward pressure buffer distance between the top of the cylinder of the viscous damper 2 and the first support plate 11. It should be noted that the cylinder seat and the guide rod head of the viscous damper need to be fixed to the corresponding support plate to effectively exert the damping effect of the viscous damper.

[0040] In some other embodiments, the first support plate 11 is provided with four bolt holes 18 for connecting the friction pendulum support 3, and the second support plate 12 is provided with four perforated ear plates 19 on its periphery. The perforated ear plates 19 are connected to the ground foundation by fasteners (connecting bolts 4).

[0041] It should be noted that the perforated lugs for bolt holes are usually set at four points: 90°, 180°, 270°, and 360°.

[0042] In other embodiments, the friction pendulum support 3 includes an upper support plate 31, a lower support plate 32, a spherical crown liner 33, and a sliding plate 34. The upper support plate 31 and the lower support plate 32 are both circular plates made of Q355 steel. The bottom side of the upper support plate 31 and the top side of the lower support plate 32 are provided with a spherical cavity surface with an equivalent radius of curvature of 1000mm. The corresponding spherical cavity surfaces of the upper support plate 31 and the lower support plate 32 are fixed with spherical stainless steel plates 35. The upper and lower sides of the spherical crown liner 33 are respectively provided with grooves. There are two sets of sliding plates 34, which are respectively embedded in the grooves. The sliding plates 34 slide in contact with the spherical stainless steel plates 35 of the spherical cavity surface. The surface of the sliding plates 34 is adapted to the spherical cavity surface.

[0043] It should be noted that the upper and lower support plates are symmetrically arranged on the upper and lower sides of the spherical crown liner and its sliding plate, which can fully exert the lateral buffering effect.

[0044] In some other embodiments, a modified ultra-high molecular weight polyethylene layer is provided on the surface of the slide plate 34 near the spherical stainless steel plate 35, and the coefficient of friction between the modified ultra-high molecular weight polyethylene layer and the spherical stainless steel plate 35 is 0.05.

[0045] In other embodiments, the upper support plate 31 and the lower support plate 32 are provided with four perforated lugs on their periphery, specifically at 90°, 180°, 270° and 360° points. The upper support plate 31 is connected to the cabinet of cultural relics through the perforated lugs and fasteners, and the lower support plate 32 is connected to the steel spring support 1 through the perforated lugs and fasteners. The fasteners are usually connecting bolts 4.

[0046] The viscous damper or oil damper has a built-in double-out rod, central axis motion type structure; its dimensions are: total length 190±0.5mm, cylinder outer diameter ≤70mm; extension stroke (after spring compression of 27mm) ±12mm with mechanical limit buffer; its damping is 13.3±1Ns / m (@0.05m / s) (meaning that the damper provides a nominal damping force coefficient of 13.3 N / s per meter at a speed of 0.05 m / s, with an allowable deviation of ±1 Ns / m); its linearity is n=1.0±0.15 (range 0.01-0.1m / s). It is sealed according to the zero-leakage standard (no oil stains after 24 hours of standing).

[0047] This invention also discloses a molding method for a vibration-assisted protective base for fragile cultural relics, which includes the following steps: Step 1: Calculate the technical parameters of relevant components based on the installation environment and actual needs, including the steel spring parameters of the steel spring support, the damping coefficient of the viscous damper, and the dynamic friction coefficient of the friction pendulum support. Step 2: Based on Step 1, select appropriate assembly parts for the steel spring support, viscous damper, and friction pendulum support. Step 3: Assemble the steel spring support assembly parts from Step 2, assemble the friction pendulum support assembly parts, and assemble the assembled steel spring support with the viscous damper. On this basis, connect the assembled friction pendulum support with connecting bolts. Step 4: Install the protective base formed in Step 3 between the ground foundation and the cabinet of cultural relics or between the building foundation frame columns using connecting bolts.

[0048] In step one, based on the target of strong horizontal earthquake isolation, the horizontal isolation period T of the friction pendulum bearing is determined, and the equivalent radius of curvature R and the dynamic friction coefficient of the spherical socket surface of the friction pendulum bearing are calculated, R=(T / 2π). 2 ×g; T is the oscillation period of the friction pendulum support, g is the gravitational acceleration, and the natural vibration period of the isolation target in this case is 2s, thus determining that the oscillation period of its friction pendulum is 1m; the dynamic friction coefficient in this example is 0.05; The stiffness of the steel springs is determined based on the vertical vibration isolation frequency of the environment. The vertical load that each steel spring needs to bear is determined based on the design bearing capacity; in this case, m = 5000 kg (50 kN). Then, the stiffness of the steel springs (k = 450 N / mm) is determined based on the target vertical frequency (f = 3 Hz in this case), using the formula k = m × f. 2 ; m is the vertical load that each steel spring needs to bear, and f is the frequency; further design the steel spring wire diameter d, spring mean diameter D, and effective number of coils n. First, determine the spring mean diameter D = 130.0 mm and the effective number of coils n = 4 based on the dimensions, and then use the formula d = (8 × n × D) 3 ×k / G) 0.25 Calculate the diameter of the spring steel wire d = 25.0 mm.

[0049] The damping of the viscous damper is set based on the vibration reduction capacity of the steel spring support. The optimal damping ratio ζ of the viscous damper is 5%-10%, and 7% is selected in this case. The damping corresponding to the four steel springs is calculated according to the formula. C = 2 × ζ × (k) total ×m total ) 1 / 2 =2×0.07×(4×450×10 -3)×5000=13.3±1Ns / m (@0.05m / s).

[0050] In step three, before the friction pendulum support is assembled, it is necessary to test the technical parameters and accuracy of the relevant accessories, including the radius of curvature, profile, and mirror finish of the spherical socket surface, as well as the surface accuracy, profile, and mirror finish of the sliding plate, in order to ensure the operating performance of the friction pendulum support.

[0051] Friction pendulum bearings, compared to steel damping bearings of the same tonnage, are lighter, have higher load-bearing capacity, and a larger damping ratio. Their unique circular arc sliding surface also gives them a self-resetting function, eliminating the need for an additional damping centripetal mechanism. By oscillating, they extend the natural vibration period of the lower structure, achieving seismic isolation, making them simpler and more reliable in practical applications.

[0052] The challenges in its manufacturing lie in ensuring the accuracy of the dimensional chain, inspecting the diameter of the spherical socket, and the overall machining difficulty. The dimensional accuracy of the friction pendulum support directly affects its operational stability.

[0053] It is important to note that when measuring the radius of a spherical or sliding surface arc, the measuring surface of the R-gauge should be in complete and tight contact with the arc of the workpiece. When there is no gap between the measuring surface and the arc, the arc dimension of the workpiece is the value of the R-gauge at that moment. Prepare the material according to the product size requirements. To prevent deformation, use a bending machine to create a reinforcing rib. Then determine the machining plan based on the product's spherical surface dimensional accuracy (0 / +0.2) mm. Since wire EDM is an open-cut machining process, it can disrupt the original stress of the material to some extent, leading to deformation and inconsistent dimensions. Therefore, a machining center program is used to first perform rough machining with a standard 25mm carbide cutter, followed by finish machining with a standard 10mm carbide end mill to achieve the desired arc dimension.

[0054] The spherical stainless steel plate is only 2.5mm thick, with a standard outer diameter of 640mm and a profile tolerance of 0.2. It cannot be directly clamped during processing and is a thin-walled workpiece that is prone to deformation. Therefore, special tooling needs to be designed and manufactured to process the outer diameter.

[0055] According to the drawings, a punch is machined and clamped on a four-jaw chuck, with the spherical accuracy controlled within 0.05mm. A die is machined and fixed to the tailstock rocker with screws. The formed spherical stainless steel plate is placed between the punch and die. The tailstock is used to move the die until it is flush with the punch. No overhead crane clamping is required; only rocking the tailstock in and out is needed. One operator is required for clamping and fixing. Before processing, the original protective film is re-protected with paper tape to increase the friction between the punch and die, greatly reducing scratches on the stainless steel mirror surface due to slippage. Because the die and tailstock are connected as one unit, the spherical surface is automatically ensured to be perpendicular and automatically centered. When clamping and unloading the spherical stainless steel product, only the spherical stainless steel product needs to be replaced for clamping. The operation is safe, simple, and quick, with a quality pass rate of over 99.5%, facilitating subsequent product and specification changes.

[0056] The apparatus and methods disclosed in the embodiments are described in a relatively simple manner since they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the description in the method section.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vibration-coordinated protection base for fragile cultural relics, which can be installed between the cultural relic product and the ground foundation inside a building, or between the foundation frame columns of a building, characterized in that... include: A steel spring support (1) is used to isolate vertical environmental micro-vibrations caused by rail transit. The steel spring support (1) can be connected to the ground foundation. Viscous damper (2), the viscous damper (2) is connected in parallel to the inner side of the steel spring support (1) to provide additional damping, and works with the steel spring support (1) to reduce the vertical strong earthquake caused by the earthquake. Friction pendulum support (3), the friction pendulum support (3) is connected in series on the upper side of the steel spring support (1) and is used to isolate strong horizontal ground vibration or strong horizontal floor vibration caused by earthquake. The friction pendulum support (3) can connect the cabinet of cultural relics products.

2. The vibration-assisted protection base for fragile cultural relics according to claim 1, characterized in that, The steel spring support (1) includes a first support plate (11), a second support plate (12), a steel spring assembly (13), a first guide sleeve (14), and a second guide sleeve (15). The first support plate (11) and the second support plate (12) are arranged parallel to each other at an interval. The upper side of the first support plate (11) can be connected to the friction pendulum support (3), and the lower side of the second support plate (12) can be connected to the ground foundation. The viscous damper (2) is located between the first support plate (11) and the second support plate (12). In the middle between the second support plates (12), the multiple steel spring arrays of the steel spring group (13) are distributed between the first support plate (11) and the second support plate (12) and located on the periphery of the viscous damper (2). Each steel spring has a first guide sleeve (14) and a second guide sleeve (15) on its outer periphery. The first guide sleeve (14) and the second guide sleeve (15) are fixedly connected to the first support plate (11) and the second support plate (12) respectively and slide inward and outward.

3. The vibration-assisted protection base for fragile cultural relics according to claim 2, characterized in that, The first support plate (11) has an inverted conical guide rod hole (16) in the middle. The guide rod head of the viscous damper (2) is a conical head and is adapted to be connected to the guide rod hole (16). The second support plate (12) has a positioning step hole (17) in the middle. The cylinder seat of the viscous damper (2) is adapted to be located in the positioning step hole (17). There is a downward pressure buffer distance between the top of the cylinder of the viscous damper (2) and the first support plate (11).

4. A vibration-assisted protective base for fragile cultural relics according to claim 2, characterized in that, The first support plate (11) is provided with a plurality of bolt holes (18) for connecting the friction pendulum support (3), and the second support plate (12) is provided with a plurality of perforated ear plates (19) fixed on its periphery. The perforated ear plates (19) are connected to the ground foundation by fasteners.

5. A vibration-assisted protective base for fragile cultural relics according to claim 1, characterized in that, The friction pendulum support (3) includes an upper support plate (31), a lower support plate (32), a spherical crown liner (33), and a sliding plate (34). The bottom side of the upper support plate (31) and the top side of the lower support plate (32) are provided with spherical recesses. The spherical recesses of the upper support plate (31) and the lower support plate (32) are provided with spherical stainless steel plates (35). The upper and lower sides of the spherical crown liner (33) are respectively provided with grooves. There are two sets of sliding plates (34) and they are respectively embedded in the grooves. The sliding plates (34) slide in contact with the spherical stainless steel plates (35). The profiles of the sliding plates (34) are adapted to the spherical recesses and the spherical stainless steel plates respectively.

6. A vibration-assisted protective base for fragile cultural relics according to claim 5, characterized in that, The surface of the sliding plate (34) near the spherical stainless steel plate (35) is covered with a modified ultra-high molecular weight polyethylene layer, and the coefficient of friction between the modified ultra-high molecular weight polyethylene layer and the spherical stainless steel plate (35) is 0.

05.

7. A vibration-assisted protective base for fragile cultural relics according to claim 5, characterized in that, The upper support plate (31) and the lower support plate (32) are provided with multiple perforated ear plates on their periphery. The upper support plate (31) is connected to the cabinet of cultural relics products through the perforated ear plates and fasteners. The lower support plate (32) is connected to the steel spring support (1) through the perforated ear plates and fasteners.

8. A method for forming a vibration-assisted protective base for fragile cultural relics as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Calculate the technical parameters of relevant components based on the installation environment and actual needs, including the steel spring parameters of the steel spring support, the damping coefficient of the viscous damper, and the dynamic friction coefficient of the friction pendulum support. Step 2: Based on Step 1, select appropriate assembly parts for the steel spring support, viscous damper, and friction pendulum support. Step 3: Assemble the steel spring support assembly parts from Step 2, assemble the friction pendulum support assembly parts, and assemble the assembled steel spring support with the viscous damper. On this basis, connect the assembled friction pendulum support with connecting bolts. Step 4: Install the protective base formed in Step 3 between the ground foundation and the cabinet of cultural relics or between the building foundation frame columns using connecting bolts.

9. The molding method of the vibration-coordinated protection base for fragile cultural relics according to claim 8, characterized in that, In step one, based on the target of strong horizontal earthquake isolation, the horizontal isolation period T of the friction pendulum bearing is determined, and the equivalent radius of curvature R and the dynamic friction coefficient of the spherical socket surface of the friction pendulum bearing are calculated, R=(T / 2π). 2 ×g; T is the oscillation period of the friction pendulum support, and g is the gravitational acceleration; The stiffness of the steel spring is determined based on the vertical vibration isolation frequency of the environment. The vertical load that each steel spring needs to bear is determined based on the design bearing capacity. Then, the stiffness of the steel spring is determined based on the target vertical frequency, k = m × f. 2 m is the vertical load that each steel spring needs to bear, and f is the frequency. The damping of the viscous damper is set based on the vibration reduction capacity of the steel spring support. The optimal damping ratio of the viscous damper is 5%-10%.

10. The molding method of the vibration-coordinated protection base for fragile cultural relics according to claim 8, characterized in that, In step three, before the friction pendulum support is assembled, it is necessary to test the technical parameters and parameter accuracy of the relevant accessories, including the radius of curvature, profile, and mirror finish of the ball socket surface, as well as the surface accuracy, profile, and mirror finish of the sliding plate, in order to ensure the operating performance of the friction pendulum support.

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