Weathering steel bolt connection pair and production process

Abstract

The application belongs to the technical field of bolt connection pairs, and particularly relates to a weather-resistant steel bolt connection pair and a production process, which comprises a bolt rod, a bolt head arranged at the end of the bolt rod, and a nut arranged on the outer side of the bolt rod. The arc-shaped blocking block is driven to separate from the U-shaped limiting piece by the rotation of the torsion rod, and the potential energy is released by the limiting spring plate to drive the right movement of the torsion rod, so that the tapered surface of the driving rod extrudes the telescopic rod, and the locking rod is pushed back in stages, so that the unlocking rod extends from the inside of the bolt rod, the protruding block is exposed, an axial impact channel is formed, then the instantaneous impact force applied by a hammer along the axis is directly applied to the corrosion interface of the threaded pair, the rust layer is broken along the interface by using the low impact strength of the corrosion product, the disassembly resistance is reduced compared with the traditional torsion disassembly mode, the shear wear of the thread teeth caused by the traditional torsion disassembly is effectively reduced, the corroded and deformed thread can still be effectively disassembled, and the application scenarios are expanded to extreme corrosion environments.

Description

Technical Field

[0001] This invention belongs to the field of bolt connection pair technology, and particularly relates to a weathering steel bolt connection pair and its manufacturing process. Background Technology

[0002] High-strength bolt connections are crucial in steel structures, and their reliability determines structural safety. In facilities with high safety requirements, high-strength bolt connection pairs consist of bolts, nuts, and two washers from the same batch and with the same heat treatment. However, traditional high-strength bolts are prone to corrosion and performance degradation in complex and harsh environments. Therefore, the development of weather-resistant steel bolt connection pairs and their production processes is of great significance for improving the safety and service life of steel structures.

[0003] Under the influence of corrosive media such as salt spray, acid rain, and industrial exhaust gas, threaded pairs will undergo electrochemical or chemical corrosion, causing corrosion products to fill the thread gaps and solidify, forming a mechanical fit between the thread and the nut. Existing disassembly methods use a wrench to apply a torsional torque along the circumference of the nut to overcome the frictional resistance torque between the threaded pairs and unscrew the nut. However, the mechanical fit caused by corrosion requires additional overcoming of the shear strength of the corrosion products and the chemical bonding force at the interface, which significantly increases the disassembly resistance and reduces the disassembly efficiency. In extreme cases, forced twisting can easily cause the screw to break, and the broken part is tightly fitted with the threaded hole, making it difficult to remove and further increasing the difficulty of disassembly. Summary of the Invention

[0004] In view of this, the present invention aims to solve the technical problems of existing bolts where the threaded pairs are easily mechanically interlocked under corrosive media, and traditional torsion disassembly requires overcoming high resistance and is prone to breakage of the rod and difficult to remove broken parts.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] This invention discloses a weathering steel bolt connection pair, including a bolt shank, a bolt head disposed at the end of the bolt shank, and a nut disposed on the outside of the bolt shank;

[0007] An unlocking rod is installed inside the bolt head and sleeved inside the bolt rod. The bolt rod has a groove on the inner side of the unlocking rod. A first expansion spring is sleeved in the groove. A locking rod is slidably connected to one end of the first expansion spring in the groove. The locking rod has a T-shaped longitudinal section. A locking groove is slidably connected to the vertical end of the locking rod on the outer side of the unlocking rod.

[0008] A quick-release assembly, located inside the bolt rod, is used to quickly drive the unlocking lever to remove the bolt rod from its interior.

[0009] Preferably, the unlocking rod has a telescopic groove corresponding to the locking groove, and the quick-release assembly includes:

[0010] The telescopic rod has one end that slides through the telescopic groove, and the other end that is away from the unlocking rod is in close contact with one end of the locking rod. The side of the telescopic rod near the centrifugal end of the unlocking rod has an inclined structure, and the end of the telescopic rod away from the unlocking rod is set as an arc surface that matches the outer edge of the unlocking rod.

[0011] The second expansion spring is sleeved on the outside of the telescopic rod and inside the telescopic groove;

[0012] A torsion bar, which is slidably connected inside the bolt bar, has a torsion groove at its left end;

[0013] A drive rod, at least one in number, is mounted on the right end of the torsion bar, and the left and right ends of the drive rod are set as tapered surfaces;

[0014] The U-shaped limiting component has an overall arc-shaped structure and is installed at the end of the unlocking rod away from the bolt head;

[0015] The arc-shaped blocking block has a semi-arc shape and is installed on the left side of the torsion bar and locked inside the U-shaped limiting piece.

[0016] A sealing assembly, which is disposed between the bolt shank and the bolt head, is used to seal the connection between the bolt shank and the bolt head.

[0017] Preferably, the number of locking rods inside the bolt rod is set to two sets, with four in each set, and the two sets of locking rods are staggered on the unlocking rod.

[0018] Preferably, a protruding block is installed on the right side of the bolt rod, which has a hollow structure, and a protruding groove adapted to the protruding block is opened inside the bolt head.

[0019] Preferably, the horizontal end of the U-shaped limiting member and the contact surface of the arc-shaped blocking block are both made of magnetic materials that attract each other.

[0020] Preferably, a limiting groove is formed inside the left side of the bolt rod, and one end of the torsion rod passes through the limiting groove and is fitted with a limiting spring plate. The spring potential energy of the limiting spring plate is greater than the sum of the spring potential energies of the first expansion spring and the second expansion spring.

[0021] Preferably, the sealing assembly includes:

[0022] The sealing gasket is wrapped around the protruding part of the protruding block. The sealing gasket is located inside the protruding groove. The outer ring of the sealing gasket is flush with the horizontal end of the protruding groove. The inner ring of the sealing gasket and the inner side of the protruding block are both provided with slopes.

[0023] A gasket seal is fitted onto the left side of the bolt rod.

[0024] Preferably, the right end of the torsion rod has a through slot, and the end of the unlocking rod near the bolt head has a circular groove. The sealing assembly further includes:

[0025] A miniature lead screw, which is threaded into the middle of the unlocking lever and extends through the circular groove inside the bolt head;

[0026] The rotating insert plate, which has a plate-like structure, is installed on the left side of the miniature lead screw and is located inside the through slot.

[0027] The limiting groove is arranged in a ring array on the right end of the torsion bar;

[0028] The connecting block is slidably connected inside the circular groove and threadedly connected to the miniature lead screw. The connecting block passes through the limiting groove away from the centrifugal end of the unlocking rod and is fixedly connected to the covering sealing gasket.

[0029] A manufacturing process for weather-resistant steel bolt assemblies includes the following steps:

[0030] 1. Raw materials and forming: High-strength weather-resistant steel containing elements such as copper and phosphorus is selected, melted and injected into molds for forming, and the blank is quickly cooled by cooling equipment;

[0031] 2. Blank processing: Grind the surface of the blank; perform structural processing on the bolt rod, bolt head, unlocking rod and protrusion according to the design requirements; apply magnetic material to the contact surface of the U-shaped limiter and the arc-shaped blocking block;

[0032] 3. Heat treatment: Quenching and tempering the assembled bolted connections to improve strength, toughness and fatigue resistance;

[0033] 4. Component assembly: First, install the internal spring components inside the bolt rod, unlocking rod, and torsion rod. Then, fit the unlocking rod into the bolt rod and install the protruding block, bolt head, nut, and gasket seal. Next, install the covering sealing gasket, connect the miniature lead screw and rotating insert sealing components, and finally install the U-shaped limit component and arc-shaped plug to ensure magnetic fit.

[0034] 5. Surface treatment: Spray or electroplat anti-corrosion coating on the surface, and apply anti-corrosion lubricating grease to the threads;

[0035] 6. Quality Inspection and Packaging: Comprehensive inspection is carried out using methods such as size measurement and hardness testing. Qualified products are packaged with moisture-proof and rust-proof materials and labeled with information.

[0036] Compared to existing technologies, the weathering steel bolt connection assembly and its manufacturing process described in this invention have the following advantages:

[0037] 1. This invention addresses the significant resistance inherent in traditional torsion disassembly methods, which require overcoming the shear force of corrosion products and the interfacial bonding force. Instead, this invention utilizes a rapid disassembly structure to shift the resistance from circumferential to axial. Specifically, the torsion rod rotates, causing the arc-shaped plug to disengage from the U-shaped limiting component. The limiting spring plate releases potential energy, driving the torsion rod to the right. This causes the conical surface of the driving rod to press against the telescopic rod, gradually pushing back the locking rod. This allows the unlocking rod to extend from inside the bolt rod, exposing the protruding block and forming an axial impact channel. Subsequently, the instantaneous impact force applied by a hammer along the axis directly acts on the corrosion interface of the threaded joint. Taking advantage of the low impact resistance of the corrosion products, the rust layer fractures along the interface. This significantly reduces disassembly resistance compared to traditional torsion disassembly methods, effectively minimizing thread shear wear caused by traditional torsion disassembly. It can still effectively disassemble corroded and deformed threads, extending its applicability to extreme corrosive environments.

[0038] 2. This invention addresses the issue that traditional torsion can easily cause the screw to break at the threaded section, with the broken part tightly fitted into the screw hole. This invention transfers the risk of breakage to the non-threaded section through an independent stress-bearing structure. The protruding block is forged and heat-treated, and the hollow structure has built-in cross reinforcing ribs, resulting in high compressive strength and the ability to withstand multiple hammer blows. This ensures that the impact force is completely transmitted to the corrosion interface, avoiding end face deformation or slippage caused by directly hitting the bolt rod.

[0039] 3. This invention forms a sealing assembly by combining a covered sealing gasket and a gasket sealing element, preventing rainwater and salt spray corrosive media from invading the threaded rod from the interface and internal channels. The sloping design automatically adapts to assembly errors, and after compression, it fits tightly, reducing the leakage rate compared to traditional flat seals. Moreover, when the torsion rod rotates, the rotating insert plate drives the micro screw to rotate, which drives the connecting block to move along the limiting slide groove through the threaded transmission, pulling the covered sealing gasket tightly against the gap between the bolt head and the bolt rod. Automatic sealing is achieved through extrusion deformation, without the need for additional tools or steps. The locking and sealing actions are completed simultaneously, reducing the assembly process, avoiding manual adjustment of sealing errors, and making the gap filling effect more reliable, thus enhancing the overall sealing performance. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is an exploded view of the overall structure of the present invention;

[0042] Figure 3 This is for Figure 1 Cross-sectional view of AA;

[0043] Figure 4 This is for Figure 3 Enlarged view of A in the middle;

[0044] Figure 5 This is a longitudinal section view of the bolt rod of the present invention;

[0045] Figure 6 This is a schematic diagram of the torsion bar being inserted into the unlocking bar according to the present invention;

[0046] Figure 7 This is a schematic diagram of the torsion bar of the present invention;

[0047] Figure 8 This is the longitudinal section of the bolt head and unlocking rod of the present invention;

[0048] Figure 9 This is for Figure 8 Enlarged view of B in the middle;

[0049] The markings in the diagram are as follows:

[0050] 1. Bolt rod; 11. Protrusion block; 12. Bolt head; 120. Protrusion groove; 121. Unlocking rod; 122. Telescopic groove; 123. Telescopic rod; 124. Second expansion spring; 13. Nut;

[0051] 2. Quick-release assembly; 21. First expansion spring; 22. Locking rod; 23. Locking groove; 24. Torsion rod; 25. Drive rod; 26. U-shaped limiting component; 27. Arc-shaped blocking block; 211. Limiting groove; 212. Limiting spring plate;

[0052] 3. Sealing assembly; 31. Covered sealing gasket; 32. Gasket seal; 311. Circular groove; 312. Miniature lead screw; 313. Rotating insert plate; 314. Limiting slide groove; 315. Connecting block. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0054] See Figures 1-4 As shown, the present invention provides a weathering steel bolt connection pair, including a bolt rod 1, a bolt head 12 disposed at the end of the bolt rod 1, and a nut 13 disposed on the outside of the bolt rod 1; an unlocking rod 121 is installed inside the bolt head 12 and sleeved inside the bolt rod 1; a groove is formed on the inner side wall of the bolt rod 1 adjacent to the unlocking rod 121; a first expansion spring 21 is sleeved in the groove; a locking rod 22 is slidably connected to one end of the first expansion spring 21 and fixedly connected in the groove; the locking rod 22 has a T-shaped longitudinal section; a locking groove 23 is formed on the outside of the unlocking rod 121 and slidably connected to the vertical end of the locking rod 22; and a quick disassembly assembly 2 is disposed inside the bolt rod 1 and is used to quickly drive the unlocking rod 121 to disassemble from inside the bolt rod 1.

[0055] When the nut 13 and bolt rod 1 are difficult to disassemble due to corrosion, the quick-release assembly 2 is operated to move the locking rod 22 towards the first expansion spring 21, causing the locking rod 22 to extend from the locking groove 23. During the extension of the locking rod 22, the first expansion spring 21 is compressed inside the bolt rod 1, causing the first expansion spring 21 to store elastic potential energy. As the locking rod 22 extends, the unlocking rod 121 overcomes the frictional resistance between itself and the bolt rod 1 and extends from inside the bolt rod 1, causing the bolt head 12 and the unlocking rod 121 to exit together from the bolt rod 1. The bolt rod 1 extends a certain length inside, allowing the bolt head 12 and unlocking rod 121 to be removed manually. Then, a hammer is used to strike the inside of the bolt rod 1, applying an axial impact force using the weight of the hammer. At this point, because the unlocking rod 121 and bolt head 12 have extended, the preload between the bolt head 12 and the bolt rod 1 is released, creating a hammer-capable cavity inside the bolt rod 1. This cavity, along with the bolt rod 1, transmits the shock wave generated by the hammering along the shortest axial path to the threaded connection. The peak impact value F generated by this axial impact hammering is... peak =m·v / Δt, peak impact F peak It can reach thousands of Newtons in a very short time (millisecond level). Compared with the torsional force during traditional torque disassembly, this high-frequency pulse is better at breaking the brittle rust layer at the threaded connection. This makes it easier for the entire bolt connection to overcome the mechanical interlocking resistance caused by corrosion between the threads when subjected to axial impact force, thereby enabling the bolt to be removed from the workpiece axially, instead of disassembling it by forcibly twisting the nut 13 as in the traditional way.

[0056] On the other hand, removing the bolt head 12 and the unlocking rod 121 can reduce the compressive force on the inner wall of the cavity inside the bolt rod 1 that houses the unlocking rod 121. This reduction in compressive force helps to reduce the static friction / mechanical seizing force between the corrosion products and the side of the bolt rod 1, and helps to reduce the resistance to "rusting".

[0057] Therefore, the structural design and disassembly method of the weathering steel bolt connection provided by this invention are substantially different from the traditional method of disassembling bolt connection pairs by torsion: usually, the rust engagement of the threaded pair is locked along the spiral surface like a "wedge", and it is necessary to cut and split the rust layer to disengage it. Therefore, when using the traditional torque to disengage the nut 13, the threaded pair must slide continuously along the 360° spiral surface. The rust layer is sheared and rubbed against the metal surface throughout the entire stroke. During this process, the load is continuous and distributed throughout the spiral surface, so the peak value of the torsional force is relatively low. However, the high-frequency pulse generated by the axial hammering in this invention can allow the impact peak to reach the rust layer of the threaded pair directly. The mechanical engagement is weakened by a combination of impact, vibration and splitting. Once the rust layer is broken instantly, the remaining friction is much lower, and the bolt can be pulled out axially. Therefore, this impact-vibration-splitting mode is more efficient for rust and better at breaking brittle rust layers.

[0058] Meanwhile, in this invention, after the protruding bolt head 12 and unlocking rod 121 are removed, the hammer directly strikes the end of the bolt rod 1, and the shock wave is transmitted to the threaded pair along the shortest path of the axis, no longer passing through the multi-level interface formed by the nut-washer-connector components, thus greatly reducing energy attenuation.

[0059] See Figures 3-7 As shown, traditional torsion methods require overcoming frictional torque, shear force from corrosion products, and interfacial bonding forces, resulting in significant resistance. This invention applies axial force to the unlocking rod 121 using a hammer, exerting force outward along the axis of the bolt rod 1. The impact force is transmitted to the threaded interface through the bolt rod 1, using "instantaneous impact load" to break the solid connection of corrosion products. This avoids direct shearing damage to the thread teeth by circumferential torque. Furthermore, since the shear strength of corrosion products is usually lower than their compressive strength, axial impact makes it easier for the rust layer to fracture along the interface. There is no need to rotate the thread, avoiding the aggravation of jamming caused by thread wear or seizing. This invention is particularly suitable for scenarios where the thread is severely corroded and deformed.

[0060] The unlocking rod 121 has a telescopic groove 122 corresponding to the locking groove 23. The quick-release assembly 2 includes a telescopic rod 123, one end of which slides through the telescopic groove 122, and the other end of which is away from the unlocking rod 121 and is in close contact with one end of the locking rod 22. The locking rod 22 has a beveled structure on the side near the centrifugal end of the unlocking rod 121. The end of the telescopic rod 123 away from the unlocking rod 121 is set as an arc surface adapted to the outer edge of the unlocking rod 121. A second expansion spring 124 is sleeved on the outside of the telescopic rod 123 and inside the telescopic groove 122. A torsion rod 24 is slidably connected inside the bolt rod 1. The bolt rod 1 has a through hole for the rotation of the torsion rod 24. Figure 7 As shown, a torsion groove is provided at the left end of the torsion rod 24. There is at least one drive rod 25, which is installed at the right end of the torsion rod 24. The left and right ends of the drive rod 25 are set as tapered surfaces. The U-shaped limiting member 26 has an overall arc shape structure and is installed at the end of the unlocking rod 121 away from the bolt head 12. The arc-shaped blocking block 27 has an overall semi-arc shape structure and is installed on the torsion rod 24, located on the left side of the drive rod 25, and is engaged inside the U-shaped limiting member 26.

[0061] Specifically, the initial state and component relationship are as follows: In normal use, the unlocking rod 121 is locked to the bolt rod 1 by the locking rod 22, the second expansion spring 124 is in the natural state, the telescopic rod 123 is in a stable position in the telescopic groove 122, and the arc-shaped blocking block 27 is engaged in the U-shaped limiting piece 26 to restrict the axial movement of the unlocking rod 121.

[0062] Trigger the unlocking operation: After inserting a flathead screwdriver into the through hole, insert it into the torsion groove inside the torsion rod 24, rotate the torsion rod 24 at a certain angle, so that the arc-shaped blocking block 27 is released from the restriction of the U-shaped limiting piece 26. At this time, the torsion rod 24 can move along the axial direction of the bolt rod 1.

[0063] Push the torsion bar 24 to move closer to the bolt head 12, and the drive bar 25 moves accordingly. The tapered surfaces at both ends of the drive bar 25 contact the inclined surface of the telescopic bar 123 near the centrifugal end of the unlocking bar 121. As the drive bar 25 continues to move to the right, the squeezing action of the tapered surface causes the telescopic bar 123 to slide along the centrifugal end of the unlocking bar 121, compressing the second expansion spring 124.

[0064] During the sliding process of the telescopic rod 123, the end away from the unlocking rod 121 presses against the locking rod 22, causing the locking rod 22 to retract into the bolt rod 1 against the elastic force of the first expansion spring 21 and disengage from the locking groove 23 of the unlocking rod 121, thereby releasing the axial lock between the unlocking rod 121 and the bolt rod 1. At this time, after the unlocking rod 121 and the bolt head 12 are pulled out, an open inner hole channel is formed at the end of the bolt rod 1, providing operating space for subsequent axial hammering with tools such as hammers, so that the impact force can directly act on the corrosion interface of the threaded pair, effectively breaking the mechanical fit.

[0065] This invention uses mechanical transmission for unlocking and axial disassembly, reducing direct wear and stress concentration on the threads and lowering the risk of screw breakage. If breakage still occurs, the fracture surface is located on the non-threaded section, and the broken part retains a complete thread structure, making it easy to remove. This greatly improves the success rate of disassembly and the repairability of the parts. Moreover, in terms of safety, traditional disassembly is time-consuming, and the use of high-torque tools poses risks of tool rebound injury and sparks causing safety accidents. This invention has simple operation steps, requires no complex tools, and achieves unlocking through precise and controllable mechanical transmission. Axial hammering disassembly is highly efficient, while avoiding the safety hazards caused by torsion, ensuring the safety of operators and equipment.

[0066] It should be noted that a directional groove is provided on the outer side of the unlocking rod 121, and a directional seat adapted to the directional groove is installed inside the bolt rod 1 so that the unlocking rod 121 can align its locking groove 23 with the locking rod 22 during the installation process.

[0067] See Figures 2-3 As shown, the number of locking rods 22 inside the bolt rod 1 is set to two sets, with four in each set, and the two sets of locking rods 22 are staggered on the unlocking rod 121.

[0068] It should be noted that when disassembly is required, the telescopic rod 123 driven by the quick disassembly assembly 2 presses against the locking rod 22, causing the locking rod 22 to retract into the groove of the bolt rod 1 against the spring force. Since the two sets of locking rods 22 are staggered on the unlocking rod 121, they will retract alternately under the push of the telescopic rod 123, releasing the restriction on the unlocking rod 121 in stages. In this way, the unlocking rod 121 can be smoothly pulled out from inside the bolt rod 1, and then the bolt can be disassembled by axial hammering. Throughout the process, the staggered locking rods 22, in conjunction with the push of the telescopic rod 123, ensure the continuity and stability of the unlocking operation, prevent impact damage to the components caused by sudden changes in force, and ensure the smoothness and efficiency of the unlocking operation. At the same time, the staggered locking rods 22 can ensure a stable connection between the unlocking rod 121, the bolt head 12 and the bolt rod 1, significantly increasing the contact points and the force-bearing area.

[0069] See Figure 2 and Figure 8 As shown, a protruding block 11 is installed on the right side of the bolt rod 1. It has a hollow structure, and the bolt head 12 has a protruding groove 120 that matches the protruding block 11.

[0070] It should be noted that under normal use, the protruding block 11 is tightly fitted into the protruding groove 120 of the bolt head 12. The two cooperate with each other to ensure a stable connection between the bolt head 12 and the bolt shank 1, enabling the bolt as a whole to effectively withstand various loads. When it is necessary to disassemble a rusted bolt, the locking lever 121 and the bolt shank 1 are released by the quick disassembly assembly 2, and the bolt head 12 is pulled out from the bolt shank 1. At this time, the originally hidden protruding block 11 is exposed and extends a certain distance from the connector. Using a hammer or other tools to perform an axial impact on the protruding block 11, the impact force is directly transmitted to the bolt shank 1 through the protruding block 11. Furthermore, it acts on the mechanically engaged parts between the threaded pairs due to corrosion. Since the protruding block 11 and the bolt rod 1 are an integral structure, and the distance of the protrusion forms a clear force-bearing space, the impact force can be concentrated and efficiently transmitted along the bolt axis, breaking the connection of corrosion products and realizing convenient disassembly of the bolt. The setting of the protruding block 11 provides a clear and stable force-bearing point for axial hammering, avoiding problems such as uneven force and slippage that may be caused by the hammer directly hitting the end face of the bolt rod 1. During disassembly, the tool can accurately act on the protruding block 11 to ensure that the impact force is transmitted in a straight line along the bolt axis, effectively improving the controllability and efficiency of the disassembly operation.

[0071] Meanwhile, the protruding block 11, being permanently located inside the protruding groove 120, exhibits superior structural strength compared to the bolt rod 1. This is primarily due to the optimized design of materials and structure. On one hand, the protruding block 11 can be made of higher-strength materials or processed using special techniques such as forging or heat treatment to enhance its strength and hardness. On the other hand, the hollow structure of the protruding block 11 reduces weight while, through reasonable wall thickness and internal reinforcing rib design, providing excellent compressive and impact resistance. In contrast, the bolt rod 1, needing to accommodate multiple functions such as threaded connections, faces certain limitations in optimizing structural strength. Therefore, the protruding block 1... 1. It can withstand greater external forces without being easily damaged. Therefore, the high strength ensures that the protrusion 11 will not deform or be damaged when subjected to impact, thus ensuring that the impact force can be transmitted completely and efficiently. The impact force will not be consumed or dispersed due to the damage of the protrusion 11 itself. It can accurately transmit the impact force along the bolt axis to the mechanically fitted parts between the threaded pairs due to corrosion. It uses the powerful impact force to break the connection of corrosion products. Compared with the traditional method of directly striking the bolt rod 1, this method of transmitting impact force through the high-strength protrusion 11 can produce a more powerful and concentrated disassembly effect, effectively improving disassembly efficiency and reducing disassembly difficulty.

[0072] See Figures 5-8 As shown, the horizontal end of the middle region of the U-shaped limiting member 26 and the contact surface of the arc-shaped blocking block 27 are both made of magnetic materials that attract each other.

[0073] It should be noted that, firstly, when the bolt is in a vibrating environment, the magnetic force can counteract the displacement tendency caused by the vibration, ensuring that the arc-shaped blocking block 27 remains within the U-shaped limiting member 26, maintaining the initial locked state of the quick-release assembly 2, and preventing the unlocking rod 121 from accidentally unlocking due to vibration, thus reducing safety hazards and maintenance costs caused by vibration. Secondly, please refer to... Figure 6 During installation, when the arc-shaped blocking block 27 is brought close to the U-shaped limiting member 26, the attraction generated by the magnetic material will actively attract the arc-shaped blocking block 27, so that the arc-shaped blocking block 27 falls precisely into the opening of the U-shaped limiting member 26 and is locked in the slot on the inner side of the U-shaped limiting member 26. Specifically, the inner wall of the U-shaped limiting member 26 is provided with a groove for accommodating the arc-shaped blocking block 27. This groove is used to lock the arc-shaped blocking block 27, making its connection with the U-shaped limiting member 26 more reliable. The arc-shaped blocking block 27 has a semi-arc shape, and the middle area of ​​the U-shaped limiting member 26 is arc-shaped. When the arc-shaped blocking block 27 disengages from the opening of the U-shaped limiting member 26, it rotates to the opening of the U-shaped limiting member 26. The combined arc-shaped blocking block 27 and the U-shaped limiting member 26 form a near-circular shape, allowing the arc-shaped blocking block 27 to disengage from a notch in the U-shaped limiting member 26. Please refer to [link / reference needed]. Figure 6When the arc-shaped blocking block 27 enters from the opening of the U-shaped limiting member 26, the combination of the arc-shaped blocking block 27 and the U-shaped limiting member 26 forms a semi-arc shape, which facilitates the locking and limiting of the arc-shaped blocking block 27 inside the U-shaped limiting member 26. This invention can quickly complete the positioning without complicated alignment and fixing operations, providing a basis for the installation and locking of subsequent components. It eliminates the need for repeated manual adjustments, making it particularly suitable for confined spaces or high-altitude operations. This not only significantly shortens the installation time but also reduces rework caused by positioning deviations, significantly improving assembly efficiency and installation accuracy.

[0074] Meanwhile, when it is necessary to remove the bolts, the torsion bar 24 is rotated by an external tool, so that the arc-shaped blocking block 27 overcomes the magnetic force and separates from the U-shaped limiting member 26, and rotates to the opening side of the U-shaped limiting member 26, thus breaking away from the restriction of the U-shaped limiting member 26, thereby pushing the torsion bar 24 to achieve the unlocking operation.

[0075] It should be noted that, see Figures 6-8 As shown, one end of the arc-shaped blocking block 27 and both vertical ends of the U-shaped limiting member 26 are provided with bevels.

[0076] During installation, when the arc-shaped plug 27 approaches the U-shaped limiting member 26, the corresponding inclined sides of both act as guides. As the arc-shaped plug 27 continues to approach, the inclined surfaces of the inclined sides make contact, allowing the arc-shaped plug 27 to automatically slide into the limiting area formed by the slot on the U-shaped limiting member 26 under magnetic attraction or external force. This inclined surface guide reduces the requirement for precise alignment of components during installation. Even if there is a certain angle or positional deviation, the guiding effect of the inclined sides can ensure that the arc-shaped plug 27 can be positioned quickly and accurately. The guiding function of the inclined sides greatly simplifies the installation process, and operators do not need to spend a lot of time and effort on precise alignment.

[0077] See Figures 3-5 As shown, a limiting groove 211 is opened inside the left side of the bolt rod 1. One end of the torsion rod 24 passes through the limiting groove 211 and is installed with a limiting spring plate 212. The spring potential energy of the limiting spring plate 212 is greater than the sum of the spring potential energies of the first expansion spring 21 and the second expansion spring 124.

[0078] It should be noted that the limiting spring plate 212 is in a stretched state within the limiting groove 211. When disassembly is required, an external tool is used to rotate the torsion bar 24, causing the arc-shaped blocking block 27 to disengage from the U-shaped limiting member 26, thereby releasing the axial constraint on the torsion bar 24. After the torsion bar 24 is unconstrained, the limiting spring plate 212 releases the stored elastic potential energy and generates a rightward thrust, driving the torsion bar 24 to slide to the right along the inside of the bolt rod 1, so that the unlocking rod 121 automatically extends out from the inside of the bolt rod 1.

[0079] The limiting spring plate 212 is in a stretched state within the limiting groove 211 of the bolt rod 1. The potential energy of the stretched spring is greater than the sum of the potential energy of the first expansion spring 21 and the second expansion spring 124. This design ensures that when the limiting spring plate 212 releases its potential energy, the driving force is sufficient to overcome the resistance of the other two springs and promote the unlocking process smoothly. The high potential energy design of the highly efficient automatic unlocking limiting spring plate 212 eliminates the need for continuous manual force during the unlocking process. The unlocking rod 121 can be automatically pushed out simply by rotating the torsion rod 24, significantly improving disassembly efficiency.

[0080] See Figure 2 , Figure 8 and Figure 9 As shown, the sealing assembly 3 is disposed between the bolt shank 1 and the bolt head 12 for sealing the space between the bolt shank 1 and the bolt head 12. The sealing assembly 3 includes:

[0081] The sealing gasket 31 is wrapped around the protruding part of the protruding block 11. The sealing gasket 31 is located inside the protruding groove 120 and is flush with the outer ring of the sealing gasket 31 and the horizontal end of the protruding groove 120. The gasket sealing element 32 is sleeved on the left side of the bolt rod 1.

[0082] It should be noted that the covering gasket 31 and the pad seal 32 are made of elastic material. They are tightly wrapped around the protruding part of the protruding block 11 in a ring structure. The outer ring of the pad seal 32 is flush with the horizontal end of the protruding groove 120 inside the bolt head 12. The inner ring and the inner side of the protruding block 11 are both provided with slopes. This design can form a tight sealing surface during installation. The pad seal 32 is fitted into the through hole on the left side of the bolt rod 1 to seal the internal channel of the bolt rod 1 and prevent impurities and moisture from entering through the bolt rod 1. During assembly, the pad seal 32 is first fitted into the through hole of the bolt rod 1. Then the protruding groove 120 of the bolt head 12 is aligned and wrapped around the protruding block 11. The covering gasket 31 undergoes elastic deformation under the pressure of the two, which further enhances the sealing effect and prevents external impurities and rainwater from entering from the joint surface of the two. The pad seal 32 seals the through hole inside the bolt rod 1 to prevent corrosive media from entering the bolt rod 1 through the internal channel.

[0083] During disassembly, simply removing the gasket seal 32 from the through hole will unlock the inside of the through hole.

[0084] The inner ring of the sealing gasket 31 and the inner side of the protrusion 11 are both provided with slopes, which can adaptively adjust the position during the installation of the bolt head 12. As the protrusion groove 120 wraps around the protrusion 11, the sealing gasket 31 is squeezed and undergoes elastic deformation, filling all gaps and forming a tight sealing contact, effectively improving the sealing performance.

[0085] The sealing component 3 can prevent moisture and impurities from entering the bolt and causing corrosion and expansion, avoid problems such as thread jamming and component damage caused by rust layer compression, maintain the structural integrity and mechanical properties of the bolt connection pair, and ensure the long-term stability of the connection.

[0086] See Figure 5 , Figures 8-9 As shown, the right end of the torsion rod 24 has a through slot, and the end of the unlocking rod 121 near the bolt head 12 has a circular groove 311. The sealing assembly 3 also includes a miniature screw 312, which is threadedly connected to the middle of the unlocking rod 121 and extends through the circular groove 311 into the bolt head 12. The rotating insert 313 has a plate-like structure and is installed on the left side of the miniature screw 312. The rotating insert 313 is located inside the through slot. The limiting slide groove 314 is arranged in a ring array on the right end of the torsion rod 24. The connecting block 315 is slidably connected inside the circular groove 311 and threadedly connected to the miniature screw 312. The centrifugal end of the connecting block 315 away from the unlocking rod 121 passes through the limiting slide groove 314 and is fixedly connected to the covering sealing gasket 31.

[0087] It should be noted that during the initial installation phase, when the unlocking rod 121 is inserted into the bolt rod 1, the rotating insert plate 313 automatically inserts into the through slot of the torsion rod 24, establishing a mechanical connection. At this time, since one end of the spring on the limiting spring plate 212 is fixed to the side wall of the limiting groove 211, the torsion rod 24 is pushed, causing the limiting spring plate 212 to enter the tensile energy storage state. The arc-shaped blocking block 27 moves to the opening of the U-shaped limiting component 26. The operator rotates the torsion rod 24, causing the arc-shaped blocking block 27 to engage with the U-shaped limiting component 26 to complete the locking. Simultaneously, the rotating insert plate 313 rotates synchronously with the torsion rod 24, driving the micro screw 312 to rotate. The rotation of the micro screw 312 is transmitted through a threaded drive. The drive connecting block 315 moves to the left along the limiting slide groove 314. The connecting block 315 pulls the covering sealing gasket 31 to fit tightly against the surface of the protruding block 11. Through compression, elastic deformation is generated, filling the gap between the bolt head 12 and the bolt rod 1, forming a further tight seal. The automatic seal adjustment integrates the locking operation of the torsion rod 24 with the sealing gasket compression action. No additional steps or tools are required. It not only completes the limiting lock of the arc-shaped plug block 27, but also automatically strengthens the sealing effect, significantly improving assembly efficiency.

[0088] A manufacturing process for weather-resistant steel bolt assemblies includes the following steps:

[0089] 1. Raw materials and forming: High-strength weathering steel containing copper and phosphorus is selected. After melting, it is injected into the mold to form the billet. The cooling equipment quickly cools the billet. The weathering steel containing copper and phosphorus forms a dense oxide layer on the surface, which hinders the penetration of corrosive media and improves the atmospheric corrosion resistance compared with ordinary steel.

[0090] 2. Blank processing: Grind the surface of the blank; perform structural processing on bolt rod 1, bolt head 12, and unlocking rod 121 according to design requirements; treat the contact surface of U-shaped limiter 26 and arc-shaped plug 27 with magnetic material to strengthen protrusion 11. After grinding, the surface roughness is reduced, stress concentration is reduced, and structural processing ensures that the gap between locking groove 23 and limit groove 211 is small to avoid unlocking jamming. Magnetic material (such as neodymium iron boron) provides continuous adsorption force, and the heat treatment of protrusion 11 optimizes the comprehensive mechanical properties.

[0091] 3. Heat treatment: Quenching and tempering of the assembled bolted connection pair improves strength, toughness and fatigue resistance. The synergistic effect of phase transformation strengthening and stress relief enables the material to have both high strength and resistance to brittle fracture, meeting the requirements of complex working conditions such as vibration and impact.

[0092] 4. Component Assembly: First, install the internal spring components inside the bolt rod 1, unlocking rod 121, and torsion rod 24. Then, fit the unlocking rod 121 into the bolt rod 1, install the protrusion 11, bolt head 12, nut 13, and gasket sealing component 32. Next, install the covering sealing gasket 31, connect the miniature lead screw 312, rotating insert plate 313 sealing component 3, and finally install the U-shaped limit component 26 and arc-shaped blocking block 27 to ensure magnetic fit. The modular assembly process (such as spring pre-compression detection) ensures functional reliability. The mechanical linkage between magnetic fit and lead screw drive reduces manual intervention and adapts to automated production lines.

[0093] 5. Surface treatment: Spray or electroplat anti-corrosion coating on the surface, apply anti-corrosion grease to the threads. The shielding effect of the coating and the boundary lubrication effect of the grease extend the service life from both corrosion protection and mechanical performance aspects.

[0094] 6. Quality Inspection and Packaging: Comprehensive inspection is carried out using dimensional measurement and hardness testing methods. Qualified products are packaged with moisture-proof and rust-proof materials and labeled with information. Standardized testing procedures and protective materials cover the entire chain of quality control from production to delivery.

[0095] Through a comprehensive process encompassing material design, precision machining, functional integration, performance optimization, and quantity control, this weathering steel bolt connection achieves a combination of weathering steel alloying and anti-corrosion coating. It can serve for a long time in harsh environments with high corrosion rates. The axial impact design reduces disassembly force compared to traditional torsion, shortens unlocking time, and significantly improves efficiency. Its fatigue life, sealing performance, and vibration resistance are all superior to national standards. By integrating "weather resistance" and "functionality" through process innovation, it solves the problem of disassembling traditional rusted bolts and is suitable for the needs of high-end equipment and harsh environment engineering.

[0096] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A weathering steel bolt connection pair, comprising a bolt shank (1), a bolt head (12) disposed at the end of the bolt shank (1), and a nut (13) disposed on the outside of the bolt shank (1), characterized in that... An unlocking rod (121) is installed inside the bolt head (12) and sleeved inside the bolt rod (1). The bolt rod (1) has a groove on the inner side of the unlocking rod (121). A first expansion spring (21) is sleeved in the groove. A locking rod (22) is slidably connected to one end of the first expansion spring (21) in the groove. The locking rod (22) has a T-shaped longitudinal section. A locking groove (23) is slidably connected to the vertical end of the locking rod (22) on the outer side of the unlocking rod (121). A quick-release assembly (2) is disposed inside the bolt rod (1) and is used to quickly drive the unlocking rod (121) to be disassembled from inside the bolt rod (1). The unlocking rod (121) has a telescopic groove (122) in the corresponding locking groove (23). The quick-release assembly (2) includes: The telescopic rod (123) has one end that slides through the telescopic groove (122), and the other end that is away from the unlocking rod (121) is in close contact with one end of the locking rod (22). The telescopic rod (123) has a sloping structure on the side of the centrifugal end near the unlocking rod (121). The end of the telescopic rod (123) away from the unlocking rod (121) is set as an arc surface that matches the outer edge of the unlocking rod (121). The second expansion spring (124) is sleeved on the outside of the telescopic rod (123) and inside the telescopic groove (122); A torsion bar (24) is slidably connected inside the bolt rod (1), and a torsion groove is provided at the left end of the torsion bar (24); A drive rod (25), at least one in number, is installed at the right end of a torsion bar (24), the left and right ends of which are set as tapered surfaces; The U-shaped limiting component (26) has an overall arc-shaped structure and is installed on the end of the unlocking rod (121) away from the bolt head (12); The arc-shaped blocking block (27) has a semi-arc shape and is installed on the left side of the torsion bar (24) and the drive bar (25), and is snapped inside the U-shaped limiting piece (26); A sealing assembly (3) is disposed between the bolt shank (1) and the bolt head (12) for sealing between the bolt shank (1) and the bolt head (12); A limiting groove (211) is provided inside the left side of the bolt rod (1). One end of the torsion rod (24) passes through the limiting groove (211) and is fitted with a limiting spring plate (212). The spring potential energy of the limiting spring plate (212) is greater than the sum of the spring potential energies of the first expansion spring (21) and the second expansion spring (124).

2. The weathering steel bolt connection pair according to claim 1, characterized in that, The number of locking rods (22) inside the bolt rod (1) is set to two sets, with four in each set, and the two sets of locking rods (22) are staggered on the unlocking rod (121).

3. The weathering steel bolt connection pair according to claim 2, characterized in that, A protruding block (11) is installed on the right side of the bolt rod (1), which has a hollow structure. The bolt head (12) has a protruding groove (120) that matches the protruding block (11).

4. The weathering steel bolt connection pair according to claim 1, characterized in that, The contact surfaces of the U-shaped limiting member (26) and the arc-shaped blocking block (27) are both made of magnetic materials that attract each other.

5. A weathering steel bolt connection pair according to claim 1, characterized in that, The sealing assembly (3) includes: The sealing gasket (31) is wrapped around the protruding part of the protruding block (11). The sealing gasket (31) is located inside the protruding groove (120). The outer ring of the sealing gasket (31) is flush with the horizontal end of the protruding groove (120). The inner ring of the sealing gasket (31) and the inner side of the protruding block (11) are both provided with slopes. The gasket seal (32) is fitted on the left side of the bolt rod (1).

6. A weathering steel bolt connection pair according to claim 5, characterized in that, The right end of the torsion bar (24) has a through slot, and the end of the unlocking rod (121) near the bolt head (12) has a circular groove (311). The sealing assembly (3) also includes: A miniature lead screw (312) is threaded into the middle of the unlocking lever (121) and extends through the bolt head (12) within the circular groove (311); The rotating insert plate (313) has a plate-like structure and is installed on the left side of the miniature lead screw (312). The rotating insert plate (313) is located inside the through slot. The limiting groove (314) is arranged in a ring array on the right end of the torsion bar (24); The connecting block (315) is slidably connected inside the circular groove (311) and threadedly connected to the micro screw (312). The connecting block (315) passes through the limiting slide groove (314) away from the centrifugal end of the unlocking rod (121) and is fixedly connected to the covering sealing gasket (31).

7. A manufacturing process for weathering steel bolt assemblies, employing the weathering steel bolt assemblies described in claim 6, characterized in that: The specific steps are as follows: S1. Raw materials and forming: High-strength weather-resistant steel containing copper and phosphorus is selected, melted and injected into molds for forming, and the blank is quickly cooled by cooling equipment. S2. Blank processing: Grind the surface of the blank, and perform structural processing on the bolt rod (1), bolt head (12), unlocking rod (121) and protrusion (11) according to the design requirements. Apply magnetic material to the contact surface of the U-shaped limiter (26) and arc-shaped blocking block (27). S3. Heat treatment: Quenching and tempering of bolted connections after machining of blanks; S4. Component assembly: First, install the spring internal components inside the bolt rod (1), unlocking rod (121), and torsion rod (24). Then, fit the unlocking rod (121) into the bolt rod (1), install the protrusion (11), bolt head (12), nut (13), and pad seal (32). Next, install the covering sealing gasket (31), miniature screw (312), and rotating insert (313). Finally, install the U-shaped limiter (26) and arc-shaped plug (27). S5. Surface treatment: Spray or electroplat anti-corrosion coating on the surface, and apply anti-corrosion lubricating grease to the threads. S6. Quality Inspection and Packaging: Comprehensive inspection is carried out using dimensional measurement and hardness testing methods. Qualified products are packaged with moisture-proof and rust-proof materials and labeled with information.

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