Low cost regenerative viscous damper

Abstract

The utility model provides a kind of low-cost regenerative viscous damper, it is related to building structure seismic technology field, the damper includes: cylinder body assembly, by agricultural machinery scrap hydraulic oil pipe is made, right end is welded with sealing steel sheet, left end is equipped with dynamic cover plate;Piston assembly, including surface oil immersion rusted screw thread steel piston rod and laminated plow share steel sheet piston head;Three-stage composite sealing system, by outer layer pre-compression rubber ring, middle layer oil immersion canvas layer and inner layer plate spring piece are formed, and are fixed by waste bearing retainer ring spot welding;Self-adapting connecting mechanism, including the ball hinge of providing angle compensation and welded U-shaped claw;Damping liquid, by waste gear oil and rapeseed oil are mixed in proportion, by reforming bicycle air door nozzle oil injection hole is injected into cylinder body assembly, reserve expansion space, provide a kind of low-cost, reliable, easy to install and maintain viscous damper of adapting rural economic level, construction condition and maintenance capacity for rural building.

Description

Technical Field

[0001] This utility model relates to the field of seismic resistance technology for building structures, specifically to a low-cost regenerative viscous damper. Background Technology

[0002] In the field of seismic engineering, viscous dampers dissipate seismic energy through the viscous resistance of a fluid medium, making them a core device for improving the seismic performance of buildings. The working principle of viscous dampers mainly relies on the viscous properties of the internal fluid. Under seismic loading, the fluid resistance within the damper is proportional to the velocity of motion, thereby effectively reducing the amplitude of vibration in the building structure during an earthquake and minimizing damage. However, while existing technologies are widely used in urban buildings, their applicability in rural areas faces the following key bottlenecks: 1. High Cost Constraint. Traditional viscous dampers rely on high-precision stainless steel cylinders, special seals, and precision machining processes, with the material cost per unit exceeding 1,000 yuan. This is severely out of sync with the cost of rural construction (typically <500 yuan / ㎡), resulting in a significant mismatch between the cost of the damper and the economic conditions of rural buildings. Existing low-cost alternatives (such as PVC pipes and ordinary carbon steel) are prone to sealing failure (bonding strength <0.5MPa) or piston rod corrosion and jamming due to insufficient material modification, making it difficult to meet the 10-year service life requirement.

[0003] 2. Insufficient adaptability to construction precision. Urban buildings using embedded steel plates and high-strength bolts require a construction precision of ±2mm. However, rural buildings are mostly brick-concrete or wood structures, often exhibiting dimensional deviations of ±15mm. Existing damper designs largely rely on rigid connections, which cannot effectively adapt to these deviations in rural buildings. This results in a low success rate for device installation and may even lead to stress concentration, affecting structural safety. Existing rigid connection nodes cannot compensate for such deviations, leading to insufficient installation qualification rates and even stress concentration problems at joints.

[0004] 3. High technical threshold for maintenance. Traditional viscous dampers rely on specialized seals (such as Step seals) and regular hydraulic maintenance, requiring professional tools and technical personnel. Rural areas lack maintenance resources, making the devices prone to failure due to seal aging, with an average service life of less than 40% of traditional designs.

[0005] 4. Lack of Utilization of Recycled Materials. The use of recycled materials also presents problems in current viscous damper technology. Although some academics have attempted to reduce manufacturing costs using low-cost materials such as PVC pipes and ordinary carbon steel, the physical properties of these materials cannot meet the high-strength seismic requirements. In particular, their bonding strength is low, making it easy for rubber-metal interface delamination to occur, and the piston rod is prone to rust and jamming, making it difficult to guarantee the long-term stable use of the device. However, most seismic damping devices on the market are still products geared towards industrial applications, and their high cost and high technical requirements make it difficult for these technologies to be popularized and applied in rural areas.

[0006] Therefore, there is an urgent need for a low-cost, reliable, easy-to-install and-maintain viscous damper that is suitable for rural economic levels, construction conditions, and maintenance capabilities. Key breakthroughs are needed to address technical challenges such as low-cost material recycling, reliability in non-precision machining, and compensation for large-deviation connections. Utility Model Content

[0007] In view of this, the purpose of this utility model is to propose a low-cost regenerative viscous damper. Through innovative material, structural and process design, it aims to solve the contradictions between low cost and high performance, low technical requirements and high reliability, and the utilization of recycled materials and long-term stability, thereby providing an economical, practical and easy-to-operate seismic technology solution for rural buildings.

[0008] To achieve the above objectives, this utility model provides the following technical solution: To achieve the above objectives, this utility model provides a low-cost regenerative viscous damper, comprising: The cylinder assembly is made from scrapped hydraulic oil pipes from agricultural machinery. A sealing steel plate is welded to the right end, and a dynamic cover plate is provided at the left end. The outer edge of the dynamic cover plate is bonded with a rubber strip from a bicycle inner tube, and the gap between the cover plate and the inner wall of the cylinder is filled with a mixture of waste engine oil and graphite powder. Piston assembly, including a threaded steel piston rod with surface impregnation for rust prevention and a piston head made of stacked plowshare steel plate; the piston head is provided with a central assembly through hole and a peripherally distributed through hole, and the piston rod end is hot-forged into an uphead, which is interference-fitted and fixed with the pre-made hole of the piston head; The three-stage composite sealing system consists of an outer pre-compressed rubber ring, a middle oil-impregnated canvas layer, and an inner leaf spring, and is fixed by spot welding with a waste bearing cage pressure ring; Adaptive connection mechanism, including ball joints that provide angle compensation and welded U-shaped claws; The damping fluid is a mixture of waste gear oil and rapeseed oil in a certain proportion, which is injected into the cylinder assembly through the modified bicycle valve injector, leaving room for expansion.

[0009] As a further embodiment of this utility model, the cylinder assembly is made of a scrapped hydraulic oil pipe from agricultural machinery with an outer diameter of Φ89mm, a wall thickness of 4.5mm, and a length of 400mm, with an 8mm thick Q235 closed steel plate welded to the right end.

[0010] As a further embodiment of this utility model, the dynamic cover plate includes: Circular steel sheet: Φ85mm in diameter and 5mm in thickness, modified from harvester blades; The outer edge is wrapped with a 5×3mm cross-section bicycle inner tube rubber strip, which is then bonded and fixed with agricultural machinery adhesive. The gap between the steel sheet and the inner wall of the cylinder is 0.5-1mm, and the waste engine oil and graphite powder mixture is mixed in a 3:1 ratio.

[0011] As a further embodiment of this utility model, after the inner tube rubber strip of the bicycle on the dynamic cover plate is bonded and fixed to the circular steel sheet, the outer surface of the steel sheet is coated with a layer of waste engine oil and graphite powder mixture with a thickness of 0.2-0.5mm.

[0012] As a further embodiment of this utility model, the threaded steel piston rod with surface oil impregnation and rust prevention is a threaded steel piston rod with a diameter of Φ16mm and a length of 450mm that has undergone surface oil impregnation treatment, and the total thickness of the folding plowshare steel plate piston head is 10mm and the diameter is Φ84mm.

[0013] As a further embodiment of this utility model, the rust-proof layer of the threaded steel piston rod with surface impregnation and rust prevention is a composite oil-permeable layer formed by impregnation with waste machine oil after heating at 300℃, with a thickness of 0.1-0.3mm.

[0014] As a further embodiment of this utility model, the piston head is provided with a through hole of Φ8mm at the center and six Φ5mm holes evenly distributed around the circumference. The piston rod end is hot-forged at 900℃ to form a Φ25mm head, which is interference-fitted with the pre-made Φ16mm hole in the piston head, with an interference amount of 0.5-0.8mm.

[0015] As a further embodiment of this utility model, in the three-level composite sealing system, the outer pre-compressed rubber ring is a pre-compressed bicycle inner tube rubber ring; the middle oil-impregnated canvas layer is a three-layer cross-wound old canvas strip impregnated with waste engine oil; the inner leaf spring is a harvester leaf spring with three points evenly distributed at 120°, 80mm in length, 2mm in thickness, and a preload of 200N; it is fixed by spot welding with a Φ80mm waste bearing retainer pressure ring.

[0016] As a further embodiment of this utility model, the ball joint is composed of Φ30mm scrap bearing balls and upper and lower ball cups forged from plowshare steel plates. The inner spherical radius of the upper and lower ball cups is 15.5mm, and they are connected to the cylinder end by Φ12 bolts.

[0017] As a further embodiment of this utility model, the gap between the upper and lower ball cups of the ball hinge is 0.3mm, and the surface is coated with a lubricating layer of waste engine oil and graphite mixture.

[0018] As a further embodiment of this utility model, the welded U-shaped claw is cut into a U-shape from harvester blade steel. The opening of the U-shape is 50mm wide and 70mm deep, and 6 Φ6×30mm short ribs are welded on it, with a spacing of 80mm between the short ribs.

[0019] As a further embodiment of this utility model, the welded U-shaped claw welded short bars are arranged in a triangular pattern, with an 80mm center-to-center distance between adjacent bars and a weld penetration depth ≥2mm.

[0020] As a further embodiment of this utility model, the damping fluid is made from waste gear oil with a viscosity of ISO VG 220 and rapeseed oil that is first-grade pressed. The solidification point after mixing is ≤-15℃.

[0021] As a further embodiment of this utility model, the root of the piston rod is machined with a limiting groove with a depth of 2mm and a width of 5mm, forming a mechanical stop structure with the inner wall of the cylinder.

[0022] Compared with existing technologies, the low-cost regenerative viscous damper proposed in this invention has the following advantages: This invention uses scrapped agricultural machinery parts as manufacturing materials. A single product can dispose of a certain amount of scrap metal from agricultural machinery. Manufacturing is completed using basic tools from a rural blacksmith's shop, achieving ultra-low cost and resource recycling benefits, and reducing landfill pollution from waste parts. Furthermore, the three-stage composite sealing structure features an outer rubber ring providing initial elastic sealing, a middle oil-impregnated canvas compensating for processing gaps, and an inner leaf spring providing continuous compression, achieving low leakage circulation and meeting industrial-grade sealing standards. The leaf spring automatically adjusts its compression force after the seal wears, extending the effective sealing cycle compared to traditional single rubber seal structures. A large-deviation adaptive connection is achieved through a ball joint and a U-shaped... The synergistic effect of the claw welding effectively improves the installation qualification rate and eliminates the risk of stress concentration caused by construction errors. Furthermore, the multi-hole design of the piston head, combined with the mixed oil medium, generates damping force to meet the energy consumption requirements of low-rise buildings. The mixture of waste gear oil and rapeseed oil provides low-temperature fluidity, and the rust-proof layer formed by impregnation of the piston rod with waste engine oil enhances its corrosion resistance. Through dual protection of mechanical limiting and dynamic sealing, it ensures that even in the event of local failure during an earthquake, the required initial load-bearing capacity can still be maintained, preventing sudden structural damage. This overcomes the cost, technical, and maintenance bottlenecks of traditional viscous dampers in rural applications. These or other aspects of this application will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the accompanying drawings used in the description of the exemplary embodiments or related technologies will be briefly introduced below. The drawings are used to provide a further understanding of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain this utility model and do not constitute a limitation on this utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0024] Figure 2 This is an exploded view of the cylinder assembly in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0025] Figure 3 This is an exploded view of the piston assembly in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0026] Figure 4 This is an exploded view of a three-stage composite sealing system in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0027] Figure 5 This is an exploded view of the adaptive connection mechanism in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0028] Figure 6 This is a cross-sectional view of a three-stage composite sealing system in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the assembly relationship of the ball hinge in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram showing the connection relationship between the claw body and the structure in a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the installation state of a low-cost regenerative viscous damper according to an embodiment of the present invention.

[0032] Figure reference numerals: 1-Cylinder assembly, 2-Sealing steel plate, 3-Dynamic cover plate, 4-Bicycle inner tube rubber strip, 5-Piston assembly, 6-Piston rod, 7-Piston head, 8-Headpiece, 9-Three-stage composite sealing system, 10-Pre-compressed rubber ring, 11-Oil-impregnated canvas layer, 12-Leaf spring, 13-Pressure ring, 14-Adaptive connection mechanism, 15-Spherical hinge, 16-U-shaped claw, 17-Damping fluid, 18-Oil injection hole, 19-End steel plate, 20-Upper ball cup, 21-Lower ball cup, 22-Bearing ball, 23-Short rib, 24-Structural column, 25-Structural beam, 26-Fixed end, 27-Moving end, 28-Damper. Detailed Implementation

[0033] The present application will now be further described with reference to the accompanying drawings. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model are further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this application.

[0035] It should be noted that all uses of the terms "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of this utility model. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0038] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] Addressing the contradictions between low cost and high performance, low technical requirements and high reliability, and the utilization of recycled materials and long-term stability, this utility model proposes a low-cost, reliable, easy-to-install and maintain viscous damper suitable for rural economic levels, construction conditions, and maintenance capabilities. It focuses on overcoming technical challenges related to low-cost material recycling, reliability in non-precision machining, and compensation for large-deviation connections.

[0040] See Figures 1 to 8 As shown, an embodiment of this utility model provides a low-cost regenerative viscous damper, including a cylinder assembly 1, a piston assembly 5, a three-stage composite sealing system 9, an adaptive connection mechanism 14, and a damping fluid 17. The cylinder assembly 1 is made from scrapped hydraulic oil pipes from agricultural machinery, with a sealing steel plate 2 welded to the right end and a dynamic cover plate 3 at the left end. The outer edge of the dynamic cover plate 3 is bonded with a bicycle inner tube rubber strip 4, and the gap between the dynamic cover plate 3 and the inner wall of the cylinder is filled with a mixture of waste engine oil and graphite powder.

[0041] In this embodiment, the cylinder assembly 1 is made of a scrapped hydraulic oil pipe from agricultural machinery with an outer diameter of Φ89mm, a wall thickness of 4.5mm, and a length of 400mm, with an 8mm thick Q235 sealed steel plate welded to the right end. The dynamic cover plate 3 includes: Circular steel sheet: Φ85mm in diameter and 5mm in thickness, modified from harvester blades; The outer edge is wrapped with a bicycle inner tube rubber strip 4 with a cross-section of 5×3mm, and is fixed by agricultural machinery adhesive; The gap between the steel sheet and the inner wall of the cylinder is 0.5-1mm, and the waste engine oil and graphite powder mixture is mixed in a 3:1 ratio.

[0042] In this embodiment, after the inner tube rubber strip 4 of the bicycle on the dynamic cover plate 3 is bonded and fixed to the circular steel sheet, the outer surface of the steel sheet is coated with a layer of waste engine oil and graphite powder mixture with a thickness of 0.2-0.5mm.

[0043] The piston assembly 5 includes a threaded steel piston rod 6 with a surface impregnated with oil for rust prevention and a piston head 7 made of stacked plowshare steel plate; the piston head 7 is provided with an assembly through hole at the center and through holes evenly distributed around the periphery, and the piston rod 6 is hot-forged to form an uphead 8 at the end, which is interference-fitted and fixed with the pre-made hole of the piston head 7.

[0044] In this embodiment, the threaded steel piston rod 6 with surface oil impregnation for rust prevention is a threaded steel piston rod 6 with a diameter of Φ16mm and a length of 450mm that has undergone surface oil impregnation treatment, and the total thickness of the lap-welded plowshare steel plate piston head 7 is 10mm and the diameter is Φ84mm.

[0045] In this embodiment, the rust-proof layer of the threaded steel piston rod 6, which is surface-impregnated with oil for rust prevention, is a composite oil-permeable layer formed by impregnation with waste machine oil after heating at 300℃, with a thickness of 0.1-0.3mm. The piston head 7 has a central Φ8mm through hole and six circumferentially distributed Φ5mm holes. The end of the piston rod 6 is hot-forged at 900℃ to form a Φ25mm head 8, which is interference-fitted with a pre-drilled Φ16mm hole in the piston head 7, with an interference amount of 0.5-0.8mm.

[0046] The three-stage composite sealing system 9 consists of an outer pre-compressed rubber ring 10, a middle oil-impregnated canvas layer 11, and an inner leaf spring 12, and is fixed by spot welding with a waste bearing cage pressure ring 13.

[0047] In this embodiment, in the three-level composite sealing system 9, the outer pre-compressed rubber ring 10 is a pre-compressed bicycle inner tube rubber ring; the middle oil-impregnated canvas layer 11 is a three-layer old canvas strip impregnated with waste engine oil and cross-wound; the inner leaf spring 12 is a harvester leaf spring with three points evenly distributed at 120°, with a length of 80mm, a thickness of 2mm, and a preload of 200N; and it is fixed by spot welding through a Φ80mm waste bearing cage pressure ring 13.

[0048] The adaptive connection mechanism 14 includes a ball joint 15 providing ±8° angle compensation and a welded U-shaped claw 16. The ball joint 15 consists of Φ30mm scrap bearing balls 22 and upper ball cups 20 and lower ball cups 21 forged from plowshare steel plates. The inner spherical radius of the upper ball cups 20 and lower ball cups 21 is 15.5mm. It is connected to the cylinder end by Φ12 bolts. The ball joint 15 is connected to the threaded steel piston rod 6 through an end steel plate 19.

[0049] In this embodiment, the gap between the upper ball cup 20 and the lower ball cup 21 of the ball hinge 15 is 0.3mm, and the surface is coated with a lubricating layer of waste machine oil and graphite mixture. The welded U-shaped claw 16 is cut into a U-shape from harvester blade steel, with an opening width of 50mm and a depth of 70mm. Six Φ6×30mm short ribs 23 are welded on, with a spacing of 80mm between the short ribs 23. The welded short ribs 23 of the welded U-shaped claw 16 are arranged in a triangle, with a center-to-center distance of 80mm between adjacent ribs, and a weld penetration depth of ≥2mm.

[0050] In this embodiment, the piston rod 6 has a limiting groove with a depth of 2mm and a width of 5mm at its root, forming a mechanical stop structure with the inner wall of the cylinder.

[0051] The damping fluid 17 is a mixture of waste gear oil and rapeseed oil in a 4:1 volume ratio, injected into the cylinder assembly 1 through a modified bicycle valve injector 18, with a 10% expansion space reserved. In this embodiment, the viscosity of the waste gear oil in the damping fluid 17 is ISO VG 220, and the rapeseed oil is a first-grade pressed product, with a freezing point ≤-15℃ after mixing.

[0052] The utility model provides an economical and practical technical solution for earthquake resistance in rural buildings through collaborative design involving material recycling, structural innovation, and process adaptation. Specifically, it offers the following significant advantages: 1. Economic efficiency and resource recycling benefits.

[0053] Extremely low material costs: More than 90% of the parts are made from scrapped agricultural machinery parts (hydraulic oil pipes, bearing balls, cutting tool steel, etc.), and the material cost per piece is controlled within 50 yuan, which is only 5%-8% of similar products on the market.

[0054] Cost savings in process technology: By adopting cutting, forging, and welding processes commonly used in rural workshops, no precision machining equipment is required, and the labor time is less than 3 hours per set, which greatly reduces the production threshold.

[0055] Resource recycling: A single set of products can dispose of 8-10 kg of agricultural machinery waste metal, which meets the "agricultural machinery recycling" requirement in the "Implementation Plan for Emission Reduction and Carbon Sequestration in Agriculture and Rural Areas".

[0056] 2. Reliable sealing and long service life.

[0057] The three-stage composite sealing structure consists of an outer rubber ring (used tires) that provides an initial elastic seal, a middle oil-impregnated canvas (agricultural conveyor belts) that compensates for processing gaps, and an inner leaf spring (harvester spring) that maintains continuous clamping force. Under non-precision machining conditions, it achieves a leakage rate of <5ml / 50 cycles, reaching an industrial-grade sealing level.

[0058] Adaptive wear compensation: The preload of the leaf spring can be automatically adjusted as the seal wears, extending the effective sealing cycle to more than 5 years, which is 2-3 times longer than the life of traditional rubber seal structures.

[0059] 3. Construction tolerance and seismic performance.

[0060] Large deviation adaptive connection: The ball joint (modified bearing) provides ±8° angle compensation, and with the U-shaped claw welding fixation, it can eliminate ±15mm construction deviation and improve the installation qualification rate to over 90%.

[0061] High-efficiency energy dissipation mechanism: The multi-hole design of the piston head (Φ8 central hole + 6×Φ5 evenly distributed holes) works synergistically with the mixed oil medium (waste gear oil + rapeseed oil) to achieve a damping force of 8-12kN and an energy dissipation efficiency of >70%, meeting the seismic resistance requirements of low-rise rural buildings.

[0062] 4. Ease of maintenance and security.

[0063] Quick-replacement design: The sealing components use a pre-packaged replacement kit (rubber ring + canvas tape + leaf spring), which can be replaced within 30 minutes, and the maintenance skills training pass rate is >95%.

[0064] Failure protection mechanism: A limiting groove is machined at the root of the piston rod. When the seal fails completely, the mechanical limiting device can prevent the piston from falling out and avoid secondary disasters.

[0065] 5. Policy alignment and social benefits.

[0066] Localization and promotion of technology: All processes are adapted to the rural craftsman skills system (electric welding, forging, assembly), and mass production technology can be mastered in 3 days of training, promoting the implementation of the "work-for-relief" model.

[0067] See Figure 9 As shown, when installing the low-cost regenerative viscous damper of this utility model, the damper 28 is installed between the structural column 24 and the structural beam 25. The fixed end 26 is the ball joint 15 at the right end of the cylinder of the damper 28, which is welded to the building fixed point through the U-shaped claw 16. The movable end 27 is the ball joint 15 at the left end of the piston rod, which is welded to the building movable component through the U-shaped claw 16. The working stroke is indicated by the arrow, which shows the piston rod 6 moving within the stroke range of ±60mm.

[0068] In summary, this utility model uses scrapped agricultural machinery parts as manufacturing materials. A single product can dispose of a certain amount of scrap metal from agricultural machinery. Manufacturing is completed using basic tools from a rural blacksmith's shop, achieving ultra-low cost and resource recycling benefits, and reducing landfill pollution from waste parts. Furthermore, the three-stage composite sealing structure features an outer rubber ring providing initial elastic sealing, a middle oil-impregnated canvas compensating for processing gaps, and an inner leaf spring providing continuous compression, achieving low leakage circulation and meeting industrial-grade sealing standards. The leaf spring 12 automatically adjusts its clamping force after the seal wears, extending the effective sealing cycle compared to traditional single rubber seal structures. Large-deviation adaptive connection is achieved through a ball hinge 1. The synergistic welding of the piston head 5 and U-shaped claw 16 effectively improves the installation qualification rate and eliminates the risk of stress concentration caused by construction errors. Furthermore, the multi-hole design of the piston head 7, in conjunction with the mixed oil medium, generates damping force to meet the energy consumption requirements of low-rise buildings. The mixed medium of waste gear oil and rapeseed oil has low-temperature fluidity, and the anti-rust layer formed by the impregnation of waste engine oil on the piston rod 6 enhances its corrosion resistance. Through the dual protection of mechanical limiting and dynamic sealing, it ensures that even if local failure occurs during an earthquake, the required initial bearing capacity can still be maintained, avoiding sudden structural damage. This breaks through the cost, technology, and maintenance bottlenecks of traditional viscous dampers in rural applications.

[0069] The above are exemplary embodiments disclosed in this utility model. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this utility model as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0070] It should be understood that, as used herein, the singular form "a" is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the associatedly listed items. The embodiment numbers disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0071] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-cost regenerative viscous damper, characterized in that, include: The cylinder assembly (1) is made of scrapped hydraulic oil pipes from agricultural machinery. A sealing steel plate (2) is welded to the right end, and a dynamic cover plate (3) is provided at the left end. The outer edge of the dynamic cover plate (3) is bonded with a bicycle inner tube rubber strip (4), and the gap between the cover plate (3) and the inner wall of the cylinder is filled with a mixture of waste engine oil and graphite powder. Piston assembly (5) includes a threaded steel piston rod (6) with surface impregnation for rust prevention and a piston head (7) with stacked plowshare steel plate; the piston head (7) has an assembly through hole in the center and through holes evenly distributed around the periphery, and the piston rod (6) is hot-forged to form an uphead (8) at the end, which is interference-fitted and fixed with the pre-made hole of the piston head (7); The three-level composite sealing system (9) consists of an outer pre-compressed rubber ring (10), a middle oil-impregnated canvas layer (11), and an inner leaf spring (12), and is fixed by spot welding with a waste bearing cage pressure ring (13). The adaptive connection mechanism (14) includes a ball joint (15) that provides angle compensation and a welded U-shaped claw (16). Damping fluid (17) is a mixture of waste gear oil and rapeseed oil in a certain proportion, and is injected into the cylinder assembly (1) through the modified bicycle valve oil injection hole (18), leaving room for expansion.

2. The low-cost regenerative viscous damper as described in claim 1, characterized in that, The cylinder assembly (1) is made of a scrapped hydraulic oil pipe of agricultural machinery with an outer diameter of Φ89mm, a wall thickness of 4.5mm, and a length of 400mm, and the right end is welded with an 8mm thick Q235 closed steel plate.

3. The low-cost regenerative viscous damper as described in claim 2, characterized in that, The dynamic cover plate (3) includes: Circular steel sheet: Φ85mm in diameter and 5mm in thickness, modified from harvester blades; The outer edge is wrapped with a bicycle inner tube rubber strip (4) with a cross section of 5×3mm, and is fixed by agricultural machinery adhesive; The gap between the steel sheet and the inner wall of the cylinder is 0.5-1mm, and the waste engine oil and graphite powder mixture is mixed in a 3:1 ratio.

4. The low-cost regenerative viscous damper as described in claim 3, characterized in that, After the inner tube rubber strip (4) of the dynamic cover plate (3) is bonded and fixed to the circular steel sheet, the outer surface of the steel sheet is coated with a layer of waste engine oil and graphite powder mixture with a thickness of 0.2-0.5mm.

5. The low-cost regenerative viscous damper as described in claim 1, characterized in that, The threaded steel piston rod (6) with surface oil impregnation for rust prevention is a threaded steel piston rod (6) with a diameter of Φ16mm and a length of 450mm with surface oil impregnation treatment, and the total thickness of the folded plowshare steel plate piston head (7) is 10mm and the diameter is Φ84mm.

6. The low-cost regenerative viscous damper as described in claim 5, characterized in that, The rust-proof layer of the threaded steel piston rod (6) with surface impregnation and rust prevention is a composite oil-permeable layer formed by impregnation with waste machine oil after heating at 300℃, with a thickness of 0.1-0.3mm.

7. The low-cost regenerative viscous damper as described in claim 6, characterized in that, The piston head (7) has a through hole of Φ8mm in the center and six Φ5mm holes evenly distributed around the circumference. The piston rod (6) is hot-forged at 900℃ to form a Φ25mm head (8), which is interference-engaged with the pre-made Φ16mm hole of the piston head (7) with an interference amount of 0.5-0.8mm.

8. The low-cost regenerative viscous damper as described in any one of claims 1-7, characterized in that, In the three-level composite sealing system (9), the outer pre-compressed rubber ring (10) is a pre-compressed bicycle inner tube rubber ring; the middle oil-impregnated canvas layer (11) is a three-layer old canvas strip impregnated with waste engine oil and cross-wound; the inner leaf spring (12) is a harvester leaf spring with three points evenly distributed at 120°, with a length of 80mm, a thickness of 2mm, and a pre-tightening force of 200N; and it is fixed by spot welding through a Φ80mm waste bearing retainer pressure ring (13).

9. The low-cost regenerative viscous damper as described in claim 8, characterized in that, The ball joint (15) is composed of Φ30mm scrap bearing balls and upper ball cup (20) and lower ball cup (21) forged from plowshare steel plate. The inner spherical radius of the upper ball cup (20) and lower ball cup (21) is 15.5mm, and they are connected to the cylinder end by Φ12 bolts.

10. The low-cost regenerative viscous damper as described in claim 9, characterized in that, The welded U-shaped claw (16) is cut into a U-shape by harvester blade steel. The opening of the U-shape is 50mm wide and 70mm deep. Six Φ6×30mm short bars (23) are welded on it. The spacing between the short bars (23) is 80mm. The welded short bars (23) of the welded U-shaped claw (16) are arranged in a triangular pattern. The center distance between adjacent bars is 80mm and the welding penetration is ≥2mm.

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