A redundant force path reinforcement device and method of use thereof

Abstract

The present application belongs to the technical field of heavy load machinery safety protection, and particularly relates to a redundant force transmission path reinforcing device and a use method thereof. The redundant force transmission path reinforcing device comprises a main force transmission inner rod, the two ends of the main force transmission inner rod are provided with fixing plates, and a force transmission reinforcing structure is sleeved on the main force transmission inner rod. By adopting a coaxial three-layer structure, the inner layer is the main force transmission inner rod, the outer layer is a flexible airtight constraint sleeve, and the middle layer is a mixed medium of rigid skeleton particles and pressure-sensitive release liquid micro-units. When the main force transmission inner rod is broken, the vacuum cavity and the annular cavity are in communication to form a pressure difference, the flexible airtight constraint sleeve is extruded to compact the medium, the negative pressure sucks fluid to fill the gap and harden into a rigid load-bearing body, a redundant force transmission path is formed to take over the load, and the safety protection demand of heavy load machinery is met. The present application also provides a use method for the redundant force transmission path, which is convenient for operators to understand and use.

Description

Technical Field

[0001] This invention belongs to the field of heavy-duty machinery safety protection technology. Specifically, this invention relates to a redundant force transmission path reinforcement device and its usage method. Background Technology

[0002] In heavy-duty machinery, construction machinery, aerospace equipment, and heavy robots, the main force transmission members are the core load-bearing components of the equipment, playing a crucial role in transmitting combined loads such as tension, compression, bending, and torsion. Their structural integrity and operational reliability directly determine the equipment's operational safety, service life, and the safety of personnel and property.

[0003] Currently, most existing main force transmission systems adopt a single load-bearing structure design, relying solely on the material strength and structural stiffness of the main force transmission member to transfer loads. This is insufficient to meet the long-term service requirements of heavy-duty equipment. When the main force transmission member breaks due to prolonged exposure to alternating loads, overload impacts, material fatigue, or accidental damage, the entire force transmission path will be instantly interrupted, the core structure of the equipment will lose support, and serious safety accidents such as load fall, equipment disintegration, and component damage will occur. Especially in heavy-duty and high-altitude operation scenarios, the consequences of such accidents are even more severe, causing not only huge economic losses but also potentially endangering the personal safety of operators. Summary of the Invention

[0004] This invention is made to solve the above-mentioned problems, and aims to provide a redundant force transmission path strengthening device and its usage method that ensures reliable force transmission and prevents instantaneous support interruption when the main force transmission rod breaks. To achieve the above objective, the technical solution adopted by this invention is as follows: a redundant force transmission path strengthening device, including a main force transmission inner rod, with fixed plates at both ends of the main force transmission inner rod, and a force transmission strengthening structure sleeved on the main force transmission inner rod.

[0005] The force transmission reinforcement structure includes a flexible airtight constraint sleeve, which is fitted onto the main force transmission inner rod. Both ends of the flexible airtight constraint sleeve are sealed to the fixed plate. Reinforcing particles are provided between the flexible airtight constraint sleeve and the main force transmission inner rod. A vacuum cavity is opened inside the main force transmission inner rod.

[0006] The main force transmission inner rod is equipped with a one-way micro air extraction valve. The flexible airtight constraint sleeve has a double-layer structure. The inner layer of the flexible airtight constraint sleeve is a TPU airtight membrane, and the outer layer of the flexible airtight constraint sleeve is an aramid fiber multiaxial braided mesh tube.

[0007] The reinforcing particles include rigid skeleton particles and pressure-sensitive liquid-releasing micro-units. The space between the flexible airtight constraint sleeve and the main force transmission inner rod is filled with rigid skeleton particles and pressure-sensitive liquid-releasing micro-units. The rigid skeleton particles include rough-surfaced high-alumina ceramic microspheres. The pressure-sensitive liquid-releasing micro-units include micron-sized melamine resin microcapsules. The melamine resin microcapsules are encapsulated with polyethylene glycol. Silica particles are dispersed inside the polyethylene glycol.

[0008] The flexible airtight constraint sleeve is externally provided with an impact-resistant structure, which includes an arc-shaped plate, a connecting rod on the arc-shaped plate, a sliding hole on the fixing plate that mates with the connecting rod, a connecting plate connected to the end of the connecting rod, a spring between the connecting plate and the flexible airtight constraint sleeve, a wedge block on the fixing plate, and the connecting plate abutting against the wedge block.

[0009] A metal toothed caltrop is provided between the flexible airtight constraint sleeve and the main force transmission inner rod. The metal toothed caltrop has a cross-shaped or triangular structure.

[0010] The two ends of the flexible airtight constraint sleeve are connected to the fixed plate through self-tightening mechanical flanges.

[0011] The volume ratio of the rigid framework particles to the pressure-sensitive liquid-releasing micro-units is 75:25, and the air pressure inside the vacuum chamber of the main force transmission inner rod is 10. −3 Pa.

[0012] The main force transmission inner rod is a 7075 aluminum alloy tubular rod.

[0013] A method of using a redundant force transmission path strengthening device includes the following steps: Step S1: Construct a coaxial three-layer structure. The inner layer is the main force transmission inner rod with a pre-set vacuum cavity inside. The outer layer is a flexible airtight constraint sleeve. The middle layer is a rigid skeleton particle and pressure-sensitive liquid release micro-unit filling the annular cavity between the two. Under normal conditions, the annular cavity maintains standard atmospheric pressure. The rigid skeleton particle and pressure-sensitive liquid release micro-unit exhibit a loose flow dynamic. Step S2: When the main force transmission inner rod breaks, the broken end of the main force transmission inner rod connects the internal vacuum cavity and the annular cavity, and the air pressure in the annular cavity drops sharply, forming an internal and external air pressure difference. Step S3: External atmospheric pressure compresses the flexible airtight constraint sleeve, compressing the rigid skeleton particles. At the same time, the pressure-sensitive liquid-releasing micro-unit is squeezed and ruptured, releasing polyethylene glycol and silica particles. Step S4: The negative pressure generated by the air pressure difference draws in polyethylene glycol and silica particles, filling the gaps between the rigid skeleton particles. The variable stiffness force transmission medium layer instantly hardens into a rigid load-bearing body, forming a redundant force transmission path in situ at the fracture point of the main force transmission inner rod, thus controlling the load.

[0014] The technical effects of this invention are as follows: When the main force-transmitting inner rod breaks, the internal vacuum cavity connects with the annular gap, causing a sudden drop in air pressure within the annular gap and creating a huge internal and external air pressure difference. External atmospheric pressure pushes the flexible, airtight constraint sleeve inward, which then uniformly transmits the extrusion pressure to the internal reinforcing particles. As the extrusion pressure gradually increases, reaching the mechanical brittle yield threshold of the melamine resin microcapsules, the micron-sized melamine resin microcapsules rupture instantaneously, releasing the encapsulated polyethylene glycol and silica particles. These particles quickly fill the annular gap. Under the negative pressure suction effect generated by the air pressure difference, the released polyethylene glycol is rapidly and thoroughly drawn into all the gaps between the ceramic microspheres. Simultaneously, the continuous external extrusion pressure pushes the ceramic microspheres to squeeze and interlock with each other, forming a dense, rigid skeleton. The silica particles fill the tiny gaps between the ceramic microspheres, working synergistically with the polyethylene glycol to generate strong adhesion and frictional resistance, instantly transforming the entire reinforcing particle from a loose, flowing dynamic into an integrated, rigid load-bearing body with extremely high shear and tensile strength. The hardened reinforcing particles form a rigid support at the fracture site of the main force transmission inner rod, directly taking over all the load after the main force transmission inner rod breaks. The load is transferred to the flexible airtight constraint sleeve through the rigid load-bearing body, and then to the fixed plates at both ends through the flexible airtight constraint sleeve, and finally to the external mechanical structure, completing the construction of redundant force transmission paths, preventing the device from disintegrating and the load from falling, and realizing the emergency protection function. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following: Figure 1 This is an overall structural diagram of a redundant force transmission path strengthening device according to the present invention; Figure 2 This is a cross-sectional schematic diagram of a redundant force transmission path strengthening device according to the present invention. Figure 3 This is a schematic diagram of the connecting rod, connecting plate, spring, and wedge block structure of a redundant force transmission path strengthening device according to the present invention.

[0016] The markings in the diagram are as follows: 1. Main force transmission inner rod; 101. Air extraction valve; 2. Fixed plate; 3. Force transmission reinforcement structure; 301. Flexible airtight constraint sleeve; 4. Reinforcing particles; 5. Impact-resistant structure; 501. Arc plate; 502. Connecting rod; 503. Sliding hole; 504. Connecting plate; 505. Spring; 506. Wedge block. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0018] like Figures 1-3 As shown, a redundant force transmission path reinforcement device includes a main force transmission inner rod 1, with fixed plates 2 at both ends of the main force transmission inner rod 1, and a force transmission reinforcement structure 3 sleeved on the main force transmission inner rod 1. The main force transmission inner rod 1 is the main load-bearing component of the device under normal conditions. The main force transmission inner rod 1 alone bears all the tensile, compressive, and bending loads on the device, ensuring the structural stability of the device during normal operation; it is suitable for scenarios with strict requirements on weight and load-bearing capacity, such as aviation and heavy industry. The main force transmission inner rod 1 is sealed and fixedly connected to the fixed plates 2, with both ends precisely aligned with the center holes of the fixed plates 2. The connection between the main force transmission inner rod 1 and the fixed plates 2 is airtightly sealed to ensure no loosening or air leakage, while evenly transmitting its own force to the fixed plates 2. The fixing plate 2 is fixed to both ends of the main force transmission inner rod 1. The fixing plate 2 serves as the mounting base for the entire device. It has mounting holes to fix the entire device to external mechanical load-bearing components, such as aircraft landing gear or crane booms, achieving a stable connection between the device and the external structure while simultaneously diverting the load to the device. The force transmission reinforcement structure 3 is prepared for emergency triggering. When the main force transmission inner rod 1 breaks, the force transmission reinforcement structure 3 quickly responds to form a rigid load-bearing body, establishing a redundant force transmission path at the fracture site of the main force transmission inner rod 1 to take over all loads, preventing device disintegration, load fall, and secondary impact damage.

[0019] The force transmission strengthening structure 3 includes a flexible airtight constraint sleeve 301, which is sleeved on the main force transmission inner rod 1. Both ends of the flexible airtight constraint sleeve 301 are sealed to the fixing plate 2. Reinforcing particles 4 are provided between the flexible airtight constraint sleeve 301 and the main force transmission inner rod 1. A vacuum cavity is opened inside the main force transmission inner rod 1.

[0020] The flexible, airtight constraint sleeve 301 is tightly and non-rigidly fitted onto the outside of the main force-transmitting inner rod 1. A uniform annular gap is reserved between the flexible, airtight constraint sleeve 301 and the main force-transmitting inner rod 1 to accommodate the reinforcing particles 4. The connection between the flexible, airtight constraint sleeve 301 and the fixing plate 2 is sealed to ensure that the annular gap is completely sealed and leak-free. At the same time, with the limiting effect of the fixing plate 2, it achieves axial fixation and avoids slippage or displacement under force. As a sealing barrier for the annular gap, the flexible, airtight constraint sleeve 301 encloses the reinforcing particles 4 between itself and the main force-transmitting inner rod 1. Under normal conditions, it maintains the standard atmospheric pressure within the annular gap, preventing external gas infiltration or internal gas leakage. At the same time, it isolates external dust, moisture, and other impurities, protecting the internal reinforcing particles 4 from contamination and ensuring their stable performance.

[0021] The reinforcing particles 4 are uniformly filled in the annular gap between the flexible airtight constraint sleeve 301 and the main force transmission inner rod 1, and are loosely distributed on the outside of the main force transmission inner rod 1 without adhering to the tube wall of the main force transmission inner rod 1. Under normal conditions, the reinforcing particles 4 exhibit a loose flow dynamic, uniformly filling the annular gap, thus preparing the components for emergency hardening.

[0022] The vacuum chamber is located inside the main force transmission inner rod 1 and is sealed by the tube wall of the main force transmission inner rod 1 to form a closed space. When the tube wall of the main force transmission inner rod 1 is intact, the vacuum chamber is completely isolated from the annular gap outside. When the main force transmission inner rod 1 breaks, the tube wall ruptures, and the vacuum chamber is instantly connected to the annular gap between the flexible airtight constraint sleeve 301 and the main force transmission inner rod 1, realizing air pressure conduction.

[0023] When the main force-transmitting inner rod 1 breaks due to fatigue, heavy load, or impact, the tube wall ruptures, and the vacuum chamber and annular gap instantly connect. Standard atmospheric pressure air rapidly rushes into the vacuum chamber from the annular gap, causing a sudden drop in air pressure between the flexible airtight constraint sleeve 301 and the main force-transmitting inner rod 1. This creates a huge pressure difference with the external atmospheric pressure, which directly drives the flexible airtight constraint sleeve 301 to contract inwards, generating a uniform radial compressive force on the reinforcing particles 4. The rigid skeleton particles compress against each other and approach the main force-transmitting inner rod 1, working together with the flexible airtight constraint sleeve 301 to form a rigid load-bearing body. This achieves seamless load connection, preventing load drop and structural disintegration.

[0024] The main force transmission inner rod 1 is equipped with a one-way micro vacuum valve 101. The flexible airtight constraint sleeve 301 has a double-layer structure, with the inner layer being a TPU airtight membrane and the outer layer being an aramid fiber multiaxial braided mesh. The one-way micro vacuum valve 101 is pre-installed on the tube wall of the main force transmission inner rod 1. The main body of the one-way micro vacuum valve 101 is embedded inside the main force transmission inner rod 1 and does not protrude outward. The one-way micro vacuum valve 101 provides a unique vacuum channel for the vacuum chamber. During the assembly stage, the interior of the main force transmission inner rod 1 can be evacuated to a high vacuum state through this valve to complete the negative pressure potential energy storage, providing the prerequisite for the formation of air pressure difference during subsequent emergency triggering.

[0025] The inner layer of the flexible airtight constraint sleeve 301 is a TPU airtight membrane, and the outer layer is an aramid fiber multiaxial braided mesh. The TPU airtight membrane of the inner layer of the flexible airtight constraint sleeve 301 achieves high airtightness and firmly locks the gas in the annular cavity, ensuring that a stable internal and external air pressure difference can be formed when the main force transmission inner rod 1 breaks, providing a basis for emergency triggering; at the same time, it is soft and can deform slightly with the main rod without interfering with normal force transmission, and does not stick to the intermediate layer medium, avoiding affecting particle flow and hardening.

[0026] The outer aramid fiber multiaxial braided mesh provides impact and tear resistance, protecting against external bumps and sharp object scratches, and preventing damage and air leakage from the inner TPU membrane; at the same time, it has a certain degree of flexibility, does not restrict the shrinkage and compression of the constraint sleeve, and has both protective and flexible adaptability, ensuring the long-term reliability of the device.

[0027] The reinforcing particle 4 comprises rigid skeleton particles and pressure-sensitive liquid-releasing micro-units. The space between the flexible, airtight constraint sleeve 301 and the main force-transmitting inner rod 1 is filled with these rigid skeleton particles and pressure-sensitive liquid-releasing micro-units. The rigid skeleton particles include rough-surfaced high-alumina ceramic microspheres, and the pressure-sensitive liquid-releasing micro-units include micron-sized melamine resin microcapsules. The melamine resin microcapsules are encapsulated with polyethylene glycol, and silica particles are dispersed within the polyethylene glycol. The rigid skeleton particles and pressure-sensitive liquid-releasing micro-units are uniformly mixed and completely fill the annular gap between the flexible, airtight constraint sleeve 301 and the main force-transmitting inner rod 1. The filling is full and without gaps, and it does not rigidly adhere to surrounding components. The limiting effect is achieved solely by the enclosure of the flexible, airtight constraint sleeve 301.

[0028] The rough-surfaced high-alumina ceramic microspheres possess extremely high hardness, shear strength, and wear resistance. The rough surface increases the coefficient of friction between particles; under emergency compression, the particles interlock and lock together, forming a dense, rigid skeleton. This provides a stable structural foundation for load transfer and can withstand tensile and compressive loads at the level of heavy machinery. The pressure-sensitive release microunit shell is a micron-sized melamine resin microcapsule. Inside the melamine resin microcapsule is a sealed polyethylene glycol (PEG) capsule, within which silica nanoparticles are dispersed. These three components form an integrated, sealed structure. PEG, acting as a dispersion carrier for the silica particles, possesses excellent flowability and adhesion. After release, it can quickly penetrate into the gaps between the rigid skeleton particles, filling all voids. PEG simultaneously provides a carrier for the silica particles and also possesses its own adhesive properties, further enhancing the connection strength between particles. Silica nanoparticles possess extremely high hardness and wear resistance. They are uniformly dispersed in polyethylene glycol and, after being released, fill the gaps between the rigid skeleton particles. The composite structure of silica nanoparticles and rough-surfaced high-alumina ceramic microspheres enhances the frictional resistance and bonding strength between particles, thereby strengthening the overall load-bearing capacity of the rigid skeleton.

[0029] When the main force transmission inner rod 1 breaks, the internal vacuum cavity connects with the annular gap, and the air pressure in the annular gap drops sharply, forming a huge pressure difference between the inside and outside. The external atmospheric pressure pushes the flexible airtight constraint sleeve 301 to contract inward, and the flexible airtight constraint sleeve 301 transmits the extrusion pressure evenly to the internal reinforcing particles 4. As the extrusion pressure gradually increases, it reaches the mechanical brittle yield threshold of the melamine resin microcapsule, and the micron-sized melamine resin microcapsule ruptures instantly, releasing the polyethylene glycol and silica particles encapsulated inside. The polyethylene glycol and silica particles quickly fill the annular gap. Under the negative pressure suction effect generated by the air pressure difference, the released polyethylene glycol is rapidly and thoroughly drawn into all the gaps between the ceramic microspheres. Simultaneously, the continuous external extrusion force pushes the ceramic microspheres to squeeze and interlock with each other, forming a dense, rigid skeleton. Silica particles fill the tiny gaps between the ceramic microspheres, working synergistically with the polyethylene glycol to generate strong adhesion and frictional resistance, instantly transforming the entire reinforced particle 4 from a loose, flowing dynamic into an integrated, rigid load-bearing body with extremely high shear and tensile strength. The hardened reinforced particle 4 forms a rigid support at the fracture site of the main force transmission inner rod 1, directly taking over all the load after the main force transmission inner rod 1 breaks. The load is transmitted through the rigid load-bearing body to the flexible, airtight constraint sleeve 301, then from the flexible, airtight constraint sleeve 301 to the fixed plates 2 at both ends, and finally to the external mechanical structure, completing the construction of redundant force transmission paths, preventing device disintegration and load fall, and achieving emergency protection functions.

[0030] The flexible airtight restraint sleeve 301 is externally equipped with an impact-resistant structure 5, which includes an arc-shaped plate 501. A connecting rod 502 is provided on the arc-shaped plate 501. A sliding hole 503 that mates with the connecting rod 502 is provided on the fixed plate 2. A connecting plate 504 is connected to the end of the connecting rod 502. A spring 505 is provided between the connecting plate 504 and the flexible airtight restraint sleeve 301. A wedge block 506 is provided on the fixed plate 2. The connecting plate 504 abuts against the wedge block 506. The arc-shaped plate 501 and the inner arc surface of the flexible airtight restraint sleeve 301 are in close contact with each other. The spring 505 is normally compressed and stores energy. The connecting rod 502 on the arc-shaped plate 501 engages with the sliding hole 503, allowing the arc-shaped plate 501 to move in a specific direction. Since the spring 505 initially has an outward elastic force, the connecting plate 504 engages with the wedge block 506. The contact surfaces of the wedge block 506 and the connecting plate 504 have a certain angle. When the spring 505 exerts a certain pushing force on the connecting plate 504, because the inclined surface of the wedge block 506 has a certain angle, the greater the pushing force of the spring 505, the more tightly the wedge block 506 is locked. Under normal use, the arc-shaped plate 501 can protect the flexible airtight constraint sleeve 301 from damage such as impacts and collisions.

[0031] When the main force transmission inner rod 1 breaks, an extremely strong ultra-high frequency mechanical vibration will burst out from inside the main force transmission inner rod 1. When the high frequency stress is generated, the arc plate 501 will hit the flexible airtight constraint sleeve 301 to accelerate the diffusion and solidification of the internal reinforcing particles 4.

[0032] A metal toothed caltrop is installed between the flexible airtight restraint sleeve 301 and the main force transmission inner rod 1. The metal toothed caltrop has a cross-shaped or triangular structure. These caltrops are randomly distributed within the annular cavity between the flexible airtight restraint sleeve 301 and the main force transmission inner rod 1. The tips of the cross-shaped or triangular structures and the gears interlock tightly like puzzle pieces or gears, forming an extremely strong three-dimensional metal mesh. The capsule is crushed to release polyethylene glycol, which then completely freezes this metal mesh, improving the overall mechanical strength.

[0033] Both ends of the flexible airtight constraint sleeve 301 are connected to the fixed plate 2 via self-tightening mechanical flanges. The self-tightening mechanical flanges clamp and press the ends of the flexible airtight constraint sleeve 301 against the outer wall of the fixed plate 2, forming a dual connection of sealing and fastening. This ensures that the annular cavity between the flexible airtight constraint sleeve 301 and the main force-transmitting inner rod 1 is completely sealed, preventing air leakage and maintaining an internal atmospheric pressure environment. This ensures that a sufficient pressure difference can be generated to trigger hardening when the main force-transmitting inner rod 1 breaks.

[0034] The volume ratio of rigid framework particles to pressure-sensitive liquid-releasing micro-units is 75:25, and the air pressure inside the vacuum chamber of the main force transmission inner rod 1 is 10. −3 Pa. 75% high-alumina ceramic microspheres provide the main compressive, shear, and bending resistance, forming the main load-bearing structure with redundant force transmission paths. Multiple points of contact and interlocking between adjacent high-alumina ceramic microspheres form a stable skeleton, which can quickly form rigid columns after fracture. The sufficiently large proportion of rough-surface ceramic beads ensures high overall stiffness and minimal deformation after curing, preventing significant compression collapse. The 25% proportion is just right to release sufficient amounts of polyethylene glycol and silica after fracture, completely filling the gaps between ceramic particles. Too little will result in insufficient filling, localized missing adhesive, and insufficient strength; too much will lead to excess fluid, lower strength after curing, and overall softness. 75% high-alumina ceramic microspheres are responsible for bearing the load, while 25% pressure-sensitive release micro-units are responsible for adhering and filling the gaps between the high-alumina ceramic microspheres.

[0035] The main force transmission inner rod 1 is a 7075 aluminum alloy tubular rod. 7075 aluminum alloy is an aerospace-grade ultra-high strength aluminum alloy, belonging to the Al-Zn-Mg-Cu series of high-strength alloys. Its tensile strength and yield strength are far higher than ordinary 6061 profiles, making it suitable as the main force transmission core rod in heavy machinery and heavy-load structures. It can withstand continuous tensile, compressive, bending, and torsional combined loads, meeting the main force transmission requirements of the device under normal conditions. When 7075 aluminum alloy fails under high stress, it is more prone to sudden brittle fracture. Before fracture, there is little plastic deformation and no obvious warning. At the moment of fracture, a large amount of elastic strain energy is released, generating strong ultra-high frequency stress waves and mechanical oscillations, making it suitable for use in impact-resistant structures.

[0036] A method of using a redundant force transmission path strengthening device includes the following steps: Step S1: Construct a coaxial three-layer structure. The inner layer is the main force transmission inner rod 1 with a pre-installed vacuum cavity. The outer layer is a flexible, airtight constraint sleeve. The middle layer consists of rigid skeleton particles and pressure-sensitive liquid-releasing micro-units filling the annular cavity between the two. Under normal conditions, the annular cavity maintains standard atmospheric pressure, and the rigid skeleton particles and pressure-sensitive liquid-releasing micro-units exhibit a loose flow dynamic. The inner layer uses a 7075 aluminum alloy tubular rod. A through-vacuum cavity is opened axially inside the main force transmission inner rod 1. The main force transmission inner rod 1 has a pre-installed one-way micro-vacuum valve 101, which is used to evacuate the vacuum cavity inside the main rod to 100°C. Under a high vacuum of ⁻³Pa, the valve is locked after evacuation to maintain the vacuum chamber sealed and pressurized. The flexible airtight constraint sleeve 301 is coaxially fitted onto the outside of the main force transmission inner rod 1. One end of the flexible airtight constraint sleeve 301 is first sealed and pressed tightly against the fixed plate 2 through a self-tightening mechanical flange to ensure the airtightness of the annular cavity. The rigid skeleton particles and pressure-sensitive liquid-releasing micro-units are mixed evenly at a volume ratio of 75:25 and loosely filled into the annular cavity. Then, the other end of the flexible airtight constraint sleeve 301 is first sealed and pressed tightly against the fixed plate 2 to ensure full filling without gaps, in preparation for emergency triggering. Step S2: When the main force transmission inner rod 1 breaks, the fracture surface of the main force transmission inner rod 1 connects the internal vacuum cavity and the annular cavity, and the air pressure in the annular cavity drops sharply, forming an internal and external air pressure difference; when the main force transmission inner rod 1 undergoes brittle fracture due to heavy load, fatigue or impact, the tube wall of the main force transmission inner rod 1 ruptures instantly, and the originally sealed vacuum cavity and the annular cavity are quickly connected through the fracture surface; since the vacuum cavity is pre-filled with a high vacuum of 10⁻³Pa, and the annular cavity is at standard atmospheric pressure, a huge air pressure difference is formed between the two; under the action of the air pressure difference, the air in the annular cavity rushes into the vacuum cavity at high speed, causing the air pressure in the annular cavity to drop sharply instantly, approaching a vacuum state; at the same time, the ultra-high frequency stress wave released at the moment of the breakage of the main force transmission inner rod 1, when the high frequency stress is generated, will cause the arc plate 501 to impact the flexible airtight constraint sleeve 301, accelerating the diffusion and solidification of the internal reinforcing particles 4; Step S3: External atmospheric pressure compresses the flexible airtight constraint sleeve, causing the rigid skeleton particles to be compressed. At the same time, the pressure-sensitive liquid-releasing micro-units are compressed and ruptured, releasing polyethylene glycol and silica particles. External atmospheric pressure compresses the flexible airtight constraint sleeve 301 from all sides towards the center. The flexible airtight constraint sleeve 301 overcomes its own flexibility and gradually contracts inward. During the contraction process, the flexible airtight constraint sleeve 301 transmits uniform radial extrusion force to the rigid skeleton particles and the pressure-sensitive liquid-releasing micro-units. Under the action of the extrusion force, the originally loose rigid skeleton particles quickly approach and interlock with each other to form a dense preliminary skeleton, and the gaps between the particles gradually decrease. Step S4: The negative pressure generated by the air pressure difference draws in polyethylene glycol and silica particles, causing them to fill the gaps between the rigid skeleton particles. The variable stiffness force transmission medium layer instantly hardens into a rigid load-bearing body, forming a redundant force transmission path in situ at the fracture point of the main force transmission rod 1, thus controlling the load. As the extrusion pressure gradually increases, reaching the mechanical brittle yield threshold of the melamine resin microcapsules, the micron-sized melamine resin microcapsules rupture instantly, releasing the encapsulated polyethylene glycol and silica particles. The polyethylene glycol and silica particles quickly fill the annular gaps. Under the negative pressure suction effect generated by the air pressure difference, the released polyethylene glycol is rapidly and thoroughly drawn into all the gaps between the ceramic microspheres. Simultaneously, the external extrusion pressure continues to act, pushing the ceramic microspheres to squeeze and interlock with each other, forming a dense rigid skeleton. The silica particles fill the tiny gaps between the ceramic microspheres, working synergistically with the polyethylene glycol to generate strong adhesion and frictional resistance, instantly transforming the entire reinforced particle 4 from a loose, flowing dynamic into an integrated rigid load-bearing body with extremely high shear and tensile strength. The hardened reinforcing particles 4 form a rigid support at the fracture site of the main force transmission inner rod 1, directly taking over all the load after the main force transmission inner rod 1 breaks; the load is transmitted to the flexible airtight constraint sleeve 301 through the rigid load-bearing body, and then from the flexible airtight constraint sleeve 301 to the fixed plates 2 at both ends, and finally to the external mechanical structure, completing the construction of redundant force transmission paths, preventing the device from disintegrating and the load from falling, and realizing the emergency protection function.

[0037] When the main force transmission inner rod 1 breaks, the internal vacuum cavity connects with the annular gap, and the air pressure in the annular gap drops sharply, forming a huge pressure difference between the inside and outside. The external atmospheric pressure pushes the flexible airtight constraint sleeve 301 to contract inward, and the flexible airtight constraint sleeve 301 transmits the extrusion pressure evenly to the internal reinforcing particles 4. As the extrusion pressure gradually increases, it reaches the mechanical brittle yield threshold of the melamine resin microcapsule, and the micron-sized melamine resin microcapsule ruptures instantly, releasing the polyethylene glycol and silica particles encapsulated inside. The polyethylene glycol and silica particles quickly fill the annular gap. Under the negative pressure suction effect generated by the air pressure difference, the released polyethylene glycol is rapidly and thoroughly drawn into all the gaps between the ceramic microspheres. Simultaneously, the continuous external extrusion force pushes the ceramic microspheres to squeeze and interlock with each other, forming a dense, rigid skeleton. Silica particles fill the tiny gaps between the ceramic microspheres, working synergistically with the polyethylene glycol to generate strong adhesion and frictional resistance, instantly transforming the entire reinforced particle 4 from a loose, flowing dynamic into an integrated, rigid load-bearing body with extremely high shear and tensile strength. The hardened reinforced particle 4 forms a rigid support at the fracture site of the main force transmission inner rod 1, directly taking over all the load after the main force transmission inner rod 1 breaks. The load is transmitted through the rigid load-bearing body to the flexible, airtight constraint sleeve 301, then from the flexible, airtight constraint sleeve 301 to the fixed plates 2 at both ends, and finally to the external mechanical structure, completing the construction of redundant force transmission paths, preventing device disintegration and load fall, and achieving emergency protection functions.

[0038] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A redundant force transmission path strengthening device, characterized in that, It includes a main force transmission inner rod (1), with fixed plates (2) at both ends of the main force transmission inner rod (1), and a force transmission strengthening structure (3) sleeved on the main force transmission inner rod (1).

2. The redundant force transmission path strengthening device according to claim 1, characterized in that: The force transmission strengthening structure (3) includes a flexible airtight constraint sleeve (301), which is sleeved on the main force transmission inner rod (1). The two ends of the flexible airtight constraint sleeve (301) are sealed to the fixed plate (2). Reinforcing particles (4) are provided between the flexible airtight constraint sleeve (301) and the main force transmission inner rod (1). A vacuum cavity is opened inside the main force transmission inner rod (1).

3. The redundant force transmission path strengthening device according to claim 2, characterized in that: The main force transmission inner rod (1) is pre-set with a one-way micro air extraction valve (101). The flexible airtight constraint sleeve (301) has a double-layer structure. The inner layer of the flexible airtight constraint sleeve (301) is a TPU airtight film, and the outer layer of the flexible airtight constraint sleeve (301) is an aramid fiber multiaxial braided mesh tube.

4. The redundant force transmission path strengthening device according to claim 2, characterized in that: The reinforcing particles (4) include rigid skeleton particles and pressure-sensitive liquid-releasing micro-units. The space between the flexible airtight constraint sleeve (301) and the main force transmission inner rod (1) is filled with rigid skeleton particles and pressure-sensitive liquid-releasing micro-units. The rigid skeleton particles include rough-surfaced high-alumina ceramic microspheres. The pressure-sensitive liquid-releasing micro-units include micron-sized melamine resin microcapsules. The melamine resin microcapsules are encapsulated with polyethylene glycol. Silica particles are dispersed inside the polyethylene glycol.

5. The redundant force transmission path strengthening device according to claim 2, characterized in that: The flexible airtight constraint sleeve (301) is provided with an impact-resistant structure (5) on the outside. The impact-resistant structure (5) includes an arc plate (501), a connecting rod (502) is provided on the arc plate (501), a sliding hole (503) is provided on the fixing plate (2) to cooperate with the connecting rod (502), a connecting plate (504) is connected to the end of the connecting rod (502), a spring (505) is provided between the connecting plate (504) and the flexible airtight constraint sleeve (301), a wedge block (506) is provided on the fixing plate (2), and the connecting plate (504) abuts against the wedge block (506).

6. The redundant force transmission path strengthening device according to claim 2, characterized in that: A metal toothed caltrop is provided between the flexible airtight constraint sleeve (301) and the main force transmission inner rod (1). The metal toothed caltrop has a cross-shaped structure or a triangular structure.

7. The redundant force transmission path strengthening device according to claim 2, characterized in that: The two ends of the flexible airtight constraint sleeve (301) are connected to the fixing plate (2) through self-tightening mechanical flanges.

8. The redundant force transmission path strengthening device according to claim 4, characterized in that: The volume ratio of the rigid skeleton particles to the pressure-sensitive liquid-releasing micro-units is 75:25, and the air pressure inside the vacuum chamber of the main force transmission inner rod (1) is 10. −3 Pa.

9. The redundant force transmission path strengthening device according to claim 1, characterized in that: The main force transmission inner rod (1) is a 7075 aluminum alloy tubular rod.

10. A method of using the redundant force transmission path strengthening device according to any one of claims 1 to 9, characterized in that: Includes the following steps: Step S1: Construct a coaxial three-layer structure. The inner layer is the main force transmission inner rod (1) with an internally pre-set vacuum cavity. The outer layer is a flexible airtight constraint sleeve. The middle layer is a rigid skeleton particle and pressure-sensitive liquid release micro-unit filling the annular cavity between the two. Under normal conditions, the annular cavity maintains standard atmospheric pressure. The rigid skeleton particle and pressure-sensitive liquid release micro-unit exhibit a loose flow dynamic. Step S2: When the main force transmission inner rod (1) breaks, the fracture surface of the main force transmission inner rod (1) connects the internal vacuum cavity and the annular cavity, and the air pressure in the annular cavity drops sharply, forming an internal and external air pressure difference. Step S3: External atmospheric pressure compresses the flexible airtight constraint sleeve, compressing the rigid skeleton particles. At the same time, the pressure-sensitive liquid-releasing micro-unit is squeezed and ruptured, releasing polyethylene glycol and silica particles. Step S4: The negative pressure generated by the air pressure difference draws in polyethylene glycol and silica particles, filling the gaps between the rigid skeleton particles. The variable stiffness force transmission medium layer hardens instantly into a rigid load-bearing body, forming a redundant force transmission path in situ at the fracture of the main force transmission inner rod (1) to carry the load.

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