High-strength nut and processing technology thereof

Abstract

The application relates to the field of nuts, in particular to a high-strength nut and a processing technology thereof. The nut comprises a cap body and a fastening assembly. A fastening ring cavity for accommodating the fastening assembly is coaxially arranged on an inner ring wall of the cap body. The fastening assembly comprises a thermal expansion and contraction arc plate. The thermal expansion and contraction arc plate is embedded in the fastening ring cavity. An inner arc surface of the thermal expansion and contraction arc plate is used for abutting against an outer wall of a bolt to form fixation. When the thermal expansion and contraction arc plate is heated and expanded, the fastening force between the inner arc surface of the thermal expansion and contraction arc plate and the outer wall of the fastening bolt is increased. In the application, the thermal expansion and contraction arc plate is arranged, the friction force of the cap body on the outer wall of the screw rod is increased, the cap body is not easily driven to rotate around the screw rod axis, and therefore the locking effect of the cap body and the screw rod on the equipment is improved.

Description

Technical Field

[0001] This application relates to the field of nuts, and in particular to a high-strength nut and its processing technology. Background Technology

[0002] A nut is a fastener that is screwed onto the outer wall of a bolt or screw to secure it. It is an essential component in all manufacturing machinery. In the operation of equipment such as engines, the bolts and matching nuts need to withstand high-temperature working environments.

[0003] When the nut is threaded onto the outer wall of the bolt, the opposite end faces of the nut and bolt press against the end face of the equipment to form a fixed fastener, thus securing the equipment. When the equipment expands due to heat during operation, the end face of the equipment presses against the end face of the nut and drives the nut to rotate around the bolt axis. The distance between the end face of the nut and the end face of the bolt increases, reducing the tightening force of the nut on the bolt, thereby reducing the locking effect of the nut and bolt on the equipment. Summary of the Invention

[0004] To improve the locking effect of nuts and bolts on equipment, this application provides a high-strength nut and its processing technology.

[0005] Firstly, this application provides a high-strength nut, which adopts the following technical solution:

[0006] A high-strength nut includes a nut body and a fastening assembly. The inner annular wall of the nut body is coaxially provided with a fastening annular cavity for accommodating the fastening assembly. The fastening assembly includes a thermally expanding and contracting arc plate, which is embedded in the fastening annular cavity. The inner arc surface of the thermally expanding and contracting arc plate is used to press against the outer wall of the bolt to form a fixation. When the thermally expanding and contracting arc plate is heated and expands, the fastening force between the inner arc surface of the thermally expanding and contracting arc plate and the outer wall of the fastening bolt increases.

[0007] By adopting the above technical solution, when the high-strength nut is used, the nut body is threaded onto the outer wall of the screw rod. The end faces of the nut body and the screw rod, which face each other, press against the end face of the equipment to form a fixed structure, thus achieving the fastening effect of the nut body and the screw rod on the equipment. At the same time, the inner arc surface of the thermal expansion and contraction arc plate presses against the outer wall of the screw rod to form a fixed structure, increasing the clamping force between the nut body and the screw rod and improving the locking stability of the nut body and the bolt on the end face of the equipment. Meanwhile, when the equipment generates heat during operation, some of the heat energy of the equipment is transferred to the thermal expansion and contraction arc plate through thermal radiation. The thermal expansion and contraction arc plate heats up and expands, pressing against the outer wall of the screw rod to form a fixed structure, increasing the friction between the nut body and the outer wall of the screw rod, making it less likely for the equipment to drive the nut body to rotate around the screw rod axis, thereby improving the locking effect of the nut body and the screw rod on the equipment.

[0008] Optionally, the fastening assembly further includes a fastening ring bladder and a fastening piston. The outer ring wall of the fastening ring bladder is coaxially connected to the inner wall of the fastening ring cavity. The outer arc surface of the thermal expansion and contraction arc plate is connected to the inner ring wall of the fastening ring bladder. The cap body has an air passage for the fastening piston to slide. The air passage connects to the inner cavity of the fastening ring bladder. The end of the fastening piston protrudes from the end face of the cap body to abut against the end face of the device. When the cap body is threadedly connected to the outer wall of the screw, the end face of the device abuts against the end of the fastening piston and drives the fastening piston to slide towards the air passage. The air in the air passage enters the inner cavity of the fastening ring bladder. The fastening ring bladder is pressurized and expands, driving the thermal expansion and contraction arc plate to slide towards the axis of the cap body and abut against the outer wall of the screw to form a fixation.

[0009] By adopting the above technical solution, the end of the fastening piston protrudes from the end face of the cap. When the cap is in use, the end face of the equipment abuts against the end of the fastening piston protruding from the end face of the cap, driving the fastening piston to slide towards the direction of air passage one. This drives the air in air passage one into the inner cavity of the pressure ring bladder, pressurizing and expanding the pressure ring bladder and driving the thermal expansion and contraction arc plate to slide towards the direction of the cap axis. The inner arc surface of the thermal expansion and contraction arc plate abuts against the outer wall of the screw to form a fixation, further improving the clamping force between the cap and the screw, making it less likely for the equipment to detach from the cap and the screw, and enhancing the locking effect of the cap and the screw on the equipment.

[0010] Optionally, the cap body has an air passage two, which is connected to the inner cavity of the fastening ring bladder. A cover plate is rotatably connected to the cap body, and the end face of the cover plate covers the air passage two to form a seal.

[0011] By adopting the above technical solution, when the cap needs to be disassembled, the operator drives the cover plate to rotate away from the second air passage. The sealing effect of the cover plate on the second air passage disappears, and the air in the sealing ring bag is discharged through the second air passage. This causes the thermal expansion and contraction arc plate to slide away from the axis of the cap. The clamping force of the thermal expansion and contraction arc plate on the outer wall of the screw disappears, thus facilitating the disassembly of the cap and the screw by the operator.

[0012] Optionally, a sealing elastic element is connected between the cap body and the cover plate, and the sealing elastic element has the tendency to force the cover plate to rotate toward the direction of the second air passage and close the second air passage.

[0013] By adopting the above technical solution, when the cap is in use, the elastic force of the sealing elastic element drives the cover plate to rotate towards the air passage 2 and seal the air passage 2, making it less likely for the cover plate to deflect on the outer wall of the cap, thereby improving the sealing stability of the cover plate to the air passage 2.

[0014] Optionally, a thermal expansion and contraction ring is connected to the end face of the cover plate facing the second air passage, and the outer ring wall of the thermal expansion and contraction ring abuts against the inner wall of the second air passage to form a seal.

[0015] By adopting the above technical solution, when the cover plate closes the second air passage, the outer ring wall of the thermal expansion and contraction ring presses against the inner wall of the second air passage to form a seal, making it difficult for air in the second air passage to escape. When the thermal expansion and contraction ring heats up and expands, it further improves the sealing stability between the inner wall of the second air passage and the outer wall of the thermal expansion and contraction ring.

[0016] Optionally, the fastening assembly further includes a fastening elastic element, one end of which is connected to an inner wall of the air passage in the elastic direction, and the other end of which is connected to the end face of the fastening piston in the elastic direction. The fastening elastic element has the elastic force to drive the fastening piston to slide towards the axis of the cap body, and the end of the fastening piston tends to protrude from the end face of the cap body.

[0017] By adopting the above technical solution, when the pressurized air in the fastening ring bladder is exhausted from the second air passage, it drives the thermal expansion and contraction arc plate to slide away from the screw. The clamping force of the thermal expansion and contraction arc plate on the outer wall of the screw disappears. When the cap is unscrewed, the cap moves away from the end face of the equipment along the screw axis. The clamping force of the end face of the equipment on the clamping piston disappears. The elastic force of the clamping elastic element drives the clamping piston to slide away from the first air passage. The end of the clamping piston protrudes from the end face of the cap, realizing the automatic reset of the cap. There is no need for the operator to manually adjust the position of the clamping piston in the first air passage, thereby improving the ease of use of the cap.

[0018] Optionally, the fastening assembly further includes a clamping elastic element, one end of which is connected to the inner wall of the fastening ring cavity in the direction of elastic force, and the other end of which is connected to the end face of the thermal expansion and contraction arc plate. The clamping elastic element has the tendency to forcefully drive the thermal expansion and contraction arc plate to slide away from the axis of the cap body.

[0019] By adopting the above technical solution, when the sealing effect of the cover plate on the second air passage disappears, the elastic force of the retaining elastic element drives the thermal expansion and contraction arc plate to slide away from the axis of the cap body. The thermal expansion and contraction arc plate drives the air in the inner cavity of the retaining ring to be discharged through the second air passage, realizing the automatic reset of the thermal expansion and contraction arc plate, so that the retaining force between the thermal expansion and contraction arc plate and the screw disappears, thereby facilitating the disassembly of the cap body and the screw by the staff.

[0020] Optionally, the cap body is connected to an opening and closing assembly. The inner wall of the fastening ring cavity has an opening and closing chamber, which is connected to the first air passage. The opening and closing assembly includes an opening and closing gear and an opening and closing arc plate. The opening and closing arc plate is slidably connected to the inner wall of the fastening ring cavity. The sliding direction of the opening and closing arc plate is parallel to the axis of the cap body. The outer arc surface of the opening and closing arc plate abuts against the inner arc surface of the thermal expansion and contraction arc plate to form a limit. The opening and closing gear is rotatably connected to the inner wall of the opening and closing chamber. The opening and closing arc plate has a tooth groove that meshes with the opening and closing gear. The fastening piston has a tooth groove that meshes with the opening and closing gear. The opening and closing arc plate and the fastening piston are located on both sides of the opening and closing gear. When the opening and closing piston slides towards the first air passage, the opening and closing gear rotates, driving the opening and closing arc plate to slide away from the opening and closing chamber. The outer arc surface of the opening and closing arc plate disengages from the inner arc surface of the thermal expansion and contraction arc plate, and the clamping effect of the opening and closing arc plate on the thermal expansion and contraction arc plate disappears.

[0021] By adopting the above technical solution, during cap installation, the cap body approaches the end face of the equipment along the screw axis. The end face of the equipment abuts against the end face of the piston and drives the piston to slide towards the air passage. The opening and closing gear rotates, causing the opening and closing arc plate to slide away from the fastening ring cavity. The outer arc surface of the opening and closing arc plate separates from the inner arc surface of the thermal expansion and contraction arc plate, and the clamping effect of the opening and closing arc plate on the thermal expansion and contraction arc plate disappears. The inner cavity of the fastening ring bladder is pressurized and drives the thermal expansion and contraction arc plate to slide towards the axis of the cap body. The inner arc surface of the thermal expansion and contraction arc plate abuts against the outer wall of the screw to form a fixation, thus achieving the clamping stability between the inner arc surface of the thermal expansion and contraction arc plate and the outer wall of the screw.

[0022] Optionally, the inner arc surface of the thermal expansion and contraction arc plate is provided with multiple deformation grooves spaced apart, and the inner wall of the deformation groove deforms and abuts against the outer wall of the screw to form a fixed shape.

[0023] By adopting the above technical solution, when the thermal expansion and contraction arc plate slides towards the direction close to the axis of the cap body, the inner wall of the deformation groove presses against the outer wall of the screw and deforms, increasing the clamping force between the thermal expansion and contraction arc plate and the screw, making it difficult for the thermal expansion and contraction arc plate to detach from the outer wall of the screw, thereby improving the connection stability between the inner arc surface of the thermal expansion and contraction arc plate and the outer wall of the screw.

[0024] Secondly, this application provides a high-strength nut processing technology, which adopts the following technical solution:

[0025] A high-strength nut processing technology for producing high-strength nuts includes the following steps:

[0026] In the initial processing, the raw material of the nut is melted at high temperature and then smelted. The molten steel is cast to produce a blank. After the blank is solution treated, it is naturally cooled in the air to obtain a solid solution. The solid solution is fed into a cold heading machine through a feeding device for forging to obtain the nut blank.

[0027] Quenching treatment: The nut blank is quenched and tempered to obtain a semi-finished nut.

[0028] Annealing treatment: Cool the semi-finished nuts to room temperature and then anneal them.

[0029] After the semi-finished nut is cooled, it is chamfered and deburred in sequence. Then, it is tapped and grooved on the inner wall according to the design process dimensions to form a fastening ring cavity. The thermal expansion and contraction arc plate is embedded in the fastening ring cavity to form a limit, and the finished nut is obtained.

[0030] Heat treatment involves sequentially performing heat treatment, aging treatment, and tempering treatment on the finished nuts to enhance their structural strength.

[0031] By adopting the above technical solutions, the internal stress of the nut is eliminated through solution treatment during the nut production process, the structure and size of the nut are stabilized, and the mechanical properties of the nut are enhanced; at the same time, the strength of the nut is improved through heat treatment.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The thermal expansion and contraction arc plate increases the friction between the cap and the outer wall of the screw, making it less likely for the equipment to drive the cap to rotate around the screw axis, thereby improving the locking effect of the cap and screw on the equipment;

[0034] 2. The fastening ring and fastening piston further enhance the clamping force between the cap and the screw, making it less likely for the equipment to detach from the cap and screw, and strengthening the locking effect of the cap and screw on the equipment;

[0035] 3. The cover plate and air passage 2 cause the thermal expansion and contraction arc plate to slide away from the axis of the cap body. The clamping force of the thermal expansion and contraction arc plate on the outer wall of the screw disappears, thus facilitating the disassembly of the cap body and the screw by the staff. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0037] Figure 2 This is a partial cross-sectional view of an embodiment of this application, mainly showing the fastening components.

[0038] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0039] Figure 4 This is a schematic diagram of the overall structure of the cover plate in an embodiment of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Cap body; 11. Fastening section; 111. Fastening ring cavity; 112. Sliding cavity; 113. Air passage one; 114. Positioning groove; 115. Air passage two; 116. Sealing cavity; 117. Opening and closing cavity; 12. Threaded section; 121. Threaded groove; 2. Fastening assembly; 21. Fastening ring bladder; 22. Fastening piston; 221. Gear groove two; 23. Thermal expansion and contraction arc plate; 231. Deformation groove; 24. Fastening elastic element; 25. Clamping elastic element; 3. Positioning rod; 4. Cover plate; 41. Retrieval groove; 5. Sealing elastic element; 6. Thermal expansion and contraction ring; 7. Opening and closing assembly; 71. Opening and closing gear; 72. Opening and closing arc plate; 721. Gear groove one. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0042] This application discloses a high-strength nut. (Refer to...) Figure 1 and Figure 2 A high-strength nut includes a nut body 1 and a fastening assembly 2. The inner ring wall of the nut body 1 is coaxially provided with a fastening ring cavity 111, which is used to accommodate the fastening assembly 2. The fastening assembly 2 is used to increase the clamping force between the inner wall of the nut body 1 and the outer wall of the screw.

[0043] Reference Figure 1 and Figure 2 The cap body 1 includes a threaded section 12 and four fastening sections 11. In this embodiment, the threaded section 12 is a cylinder and the fastening sections 11 are arc-shaped plates. The four fastening sections 11 are coaxially welded and fixed to the end face of the threaded section 12 around the axis of the threaded section 12 to form the cap body 1. Threaded grooves 121 are provided on the inner arc surface of the fastening section 11 and the inner wall of the threaded section 12. The fastening ring cavity 111 is located on the side of the fastening section 11 close to the threaded section 12.

[0044] Reference Figure 2The fastening assembly 2 includes a fastening ring bladder 21, multiple fastening pistons 22, multiple thermally expanding and contracting arc plates 23, multiple fastening elastic elements 24, and multiple abutting elastic elements 25. The fastening ring bladder 21 can be made of rubber or silicone; in this embodiment, it is made of rubber, which has a certain deformation capacity. The fastening ring bladder 21 is coaxially embedded in the fastening ring cavity 111, and its circumferential outer wall is fixed to the inner wall of the fastening ring cavity 111. In this embodiment, the thermally expanding and contracting arc plates 23 are made of nylon, which has a good coefficient of thermal expansion. The number of thermally expanding and contracting arc plates 23 can be one, two, three, or more; in this embodiment, there are four. The outer arc surfaces of the four thermally expanding and contracting arc plates 23 are evenly fixed to the inner ring wall of the fastening ring bladder 21 around its axis, and the inner arc surfaces of the thermally expanding and contracting arc plates 23 are used to abut against the outer wall of the screw to form a fixation. The inner arc surface of the thermal expansion and contraction arc plate 23 is provided with multiple deformation grooves 231 spaced apart. The inner wall of the deformation groove 231 deforms and abuts against the outer wall of the screw to form a fixed shape.

[0045] Reference Figure 1 and Figure 2 The inner ring wall of the fastening ring cavity 111 is provided with a sliding cavity 112 for the end of the thermal expansion and contraction arc plate 23 to slide. The pressing elastic element 25 can be a compression spring or a tension spring. In this embodiment, the pressing elastic element 25 is a compression spring with a certain deformation capability. The pressing elastic element 25 and the thermal expansion and contraction arc plate 23 correspond one-to-one. One end of the pressing elastic element 25 in the elastic direction is fixed on the inner wall of the sliding cavity 112, and the other end of the pressing elastic element 25 in the elastic direction is fixed on the end face of the thermal expansion and contraction arc plate 23. The elastic direction of the pressing elastic element 25 is perpendicular to the axis of the cap body 1. The pressing elastic element 25 has the tendency to drive the thermal expansion and contraction arc plate 23 to slide away from the axis of the cap body 1.

[0046] Reference Figure 1 and Figure 2 Four air passages 113 are evenly spaced on the end face of the fastening section 11 away from the threaded section 12. Each air passage 113 is located between adjacent fastening sections 11 and corresponds to a thermal expansion and contraction arc plate 23. Each air passage 113 connects to the inner cavity of the fastening ring bladder 21. A fastening piston 22 corresponds to each air passage 113 and is slidably connected to the inner wall of the air passage 113. The sliding direction of the fastening piston 22 is parallel to the axis of the threaded section 12. The end of the fastening piston 22 protruding from the end face of the fastening section 11 is used to abut against the end face of the equipment. A positioning rod 3 is fixed to the end of the fastening piston 22 protruding from the fastening section 11. The end of the positioning rod 3 away from the fastening piston 22 extends in a direction away from the axis of the cap body 1. A positioning groove 114 is provided on the end face of the fastening section 11 for the positioning rod 3 to be inserted. The positioning groove 114 penetrates the outer wall of the fastening section 11 in a direction away from the axis of the cap body 1.

[0047] Reference Figure 2The fastening elastic element 24 can be a tension spring or a compression spring. In this embodiment, the fastening elastic element 24 is a compression spring, which has a certain deformation capability. The fastening elastic element 24 corresponds one-to-one with the fastening piston 22. One end of the fastening elastic element 24 in the direction of elastic force is fixed to the inner wall of the air passage 113, and the other end of the fastening elastic element 24 in the direction of elastic force is fixed to the end face of the fastening piston 22. The direction of elastic force of the fastening elastic element 24 is parallel to the axis of the threaded section 12. The fastening elastic element 24 has the elastic force to drive the fastening piston 22 to slide away from the fastening section 11, and the end of the fastening piston 22 tends to protrude from the end face of the fastening section 11.

[0048] Reference Figure 1 and Figure 2 When the cap 1 is screwed and fixed to the outer wall of the screw, and the end face of the cap 1 and the end face of the screw are pressed against the end face of the equipment, the end face of the equipment abuts against the end face of the fastening piston 22 and drives the fastening piston 22 to slide towards the air passage 113, which drives the air in the air passage 113 into the inner cavity of the fastening ring bladder 21, which drives the thermal expansion and contraction arc plate 23 to slide towards the axis of the cap 1 and press against the outer wall of the screw to form a fixation; at the same time, the positioning rod 3 is embedded in the positioning groove 114, and the end face of the positioning rod 3 is flush with the end face of the fastening section 11, so that the staff can directly observe the tightness between the end face of the cap 1 and the end face of the equipment, thereby reducing the difficulty of the staff to maintain the equipment.

[0049] Reference Figure 2 and Figure 3 Four air passages 115 are evenly spaced on the outer wall of the fastening section 11, each corresponding to a thermal expansion and contraction arc plate 23. All air passages 115 are connected to the inner cavity of the fastening ring bladder 21. A sealing cavity 116 is formed on the inner wall of each air passage 115 away from the fastening ring bladder 21. A cover plate 4 is rotatably connected to the inner wall of each sealing cavity 116, and the rotation axis of the cover plate 4 is parallel to the axis of the fastening section 11. The cover plate 4 can be made of rubber or silicone; in this embodiment, the cover plate 4 is made of rubber, which has a certain deformation capacity.

[0050] Reference Figure 3 and Figure 4 A sealing elastic element 5 is connected between the cover plate 4 and the inner wall of the sealing cavity 116. The sealing elastic element 5 can be a tension spring or a torsion spring. In this embodiment, the sealing elastic element 5 is a torsion spring, which has a certain deformation capacity. The number of sealing elastic elements 5 can be one or two. In this embodiment, the number of sealing elastic elements 5 is two. The sealing elastic elements 5 are sleeved one-to-one at both ends of the rotating shaft of the cover plate 4. The sealing elastic element 5 has the elastic force to drive the cover plate 4 to rotate towards the air passage 2 115 and cover the air passage 2 115.

[0051] Reference Figure 3 and Figure 4A thermal expansion and contraction ring 6 is fixed to the end face of the cover plate 4 facing the second air passage 115. In this embodiment, the thermal expansion and contraction ring 6 is made of nylon and has a certain coefficient of thermal expansion. A retrieval groove 41 for inserting fingertips is provided on the end face of the cover plate 4 away from the thermal expansion and contraction ring 6. When the sealing elastic element 5 drives the cover plate 4 to rotate towards the second air passage 115, the end face of the cover plate 4 presses against the inner wall of the sealing cavity 116 and closes the second air passage 115. The outer circumference of the thermal expansion and contraction ring 6 presses against the inner wall of the second air passage 115 to form a seal, making it difficult for air in the second air passage 115 to escape from the connection between the cover plate 4 and the inner wall of the sealing cavity 116, thereby improving the sealing stability of the cover plate 4 for the second air passage 115.

[0052] Reference Figure 2 and Figure 4 When the high-strength nut needs to be unscrewed, the operator inserts the tip of their finger into the inner wall of the retrieval groove 41 and drives the cover plate 4 to rotate away from the air passage 115. The sealing effect of the cover plate 4 on the air passage 115 disappears, and the elastic force of the retaining elastic element 25 drives the thermal expansion and contraction arc plate 23 to slide away from the axis of the fastening section 11. The air in the fastening ring bladder 21 is discharged from the air passage 115, so that the clamping force of the thermal expansion and contraction arc plate 23 on the outer wall of the screw disappears, thus facilitating the operator to disassemble the nut body 1 and the screw.

[0053] Reference Figure 1 and Figure 2 The cap body 1 is connected to multiple opening and closing components 7, each corresponding to a thermal expansion and contraction arc plate 23. An opening and closing cavity 117 is provided on the inner wall of the fastening ring cavity 111 near the axis of the cap body 1. The opening and closing cavity 117 is connected to the air passage 113. The opening and closing component 7 includes an opening and closing gear 71 and an opening and closing arc plate 72. The center line of the opening and closing arc plate 72 is parallel to the center line of the thermal expansion and contraction arc plate 23. One end of the opening and closing arc plate 72 is slidably connected to the inner wall of the opening and closing cavity 117, and the other end of the opening and closing arc plate 72 is located in the fastening ring cavity 111. The outer arc surface of the opening and closing arc plate 72 is used to press against the inner arc surface of the thermal expansion and contraction arc plate 23 to form a limit.

[0054] Reference Figure 1 and Figure 2The opening and closing gear 71 is rotatably connected to the inner wall of the opening and closing cavity 117, and is located between the opening and closing arc plate 72 and the fastening piston 22. The end face of the opening and closing arc plate 72 facing the opening and closing gear 71 has a toothed groove 721 that meshes with the opening and closing gear 71, and the end face of the fastening piston 22 facing the opening and closing gear 71 has a toothed groove 221 that meshes with the opening and closing gear 71. When the end of the fastening piston 22 protrudes from the end face of the fastening section 11, the end of the opening and closing arc plate 72 is located within the fastening ring cavity 111, and the outer arc surface of the opening and closing arc plate 72 abuts against the inner arc surface of the thermal expansion and contraction arc plate 23 to form a limit. When the end face of the equipment abuts against the end of the fastening piston 22, it drives the fastening piston 22 to slide closer to the fastening section 11, causing the opening and closing gear 71 to rotate, which in turn drives the opening and closing arc plate 72 to slide closer to the opening and closing cavity 117. The outer arc surface detaches from the inner arc surface of the thermal expansion and contraction arc plate 23, and the limiting effect of the opening and closing arc plate 72 on the thermal expansion and contraction arc plate 23 disappears. The increased pressure inside the fastening ring bladder 21 drives the thermal expansion and contraction arc plate 23 to slide towards the axis of the cap body 1. The inner arc surface of the thermal expansion and contraction arc plate 23 presses against the outer wall of the screw to form a fixation, increasing the preload between the cap body 1 and the screw, making it difficult for the cap body 1 to rotate around the screw axis, thereby improving the locking effect of the cap body 1 and the screw on the equipment.

[0055] The implementation principle of a high-strength nut in this application embodiment is as follows: When the high-strength nut is used, the nut body 1 is threadedly connected to the outer wall of the screw. The end of the fastening piston 22 abuts against the end face of the equipment. The end face of the equipment drives the fastening piston 22 to slide towards the air passage 113. The opening and closing gear 71 rotates, causing the opening and closing arc plate 72 to slide away from the fastening ring cavity 111. The outer arc surface of the opening and closing arc plate 72 separates from the inner arc surface of the thermal expansion and contraction arc plate 23. The limiting effect of the opening and closing arc plate 72 on the thermal expansion and contraction arc plate 23 disappears. At the same time, the air in the air passage 113 enters the inner cavity of the fastening ring bladder 21, tightening the nut. The solid ring bladder 21 expands and drives the thermal expansion and contraction arc plate 23 to slide towards the axis of the cap body 1. The inner wall of the tooth groove is pressed against the outer wall of the screw to form a fixed position, increasing the friction between the cap body 1 and the screw, and realizing the locking of the cap body 1 and the screw to the end face of the equipment. When the equipment is running and generates heat expansion, the equipment radiates some heat energy to the thermal expansion and contraction arc plate 23. The thermal expansion and contraction arc plate 23 heats up and expands and presses against the outer wall of the screw, further increasing the clamping force between the cap body 1 and the screw, making it difficult for the equipment to drive the cap body 1 to rotate around the screw axis, thereby improving the locking effect of the cap body 1 and the screw on the equipment.

[0056] This application also discloses a high-strength nut processing technology for producing high-strength nuts, comprising the following steps:

[0057] In the initial processing, the raw material of the nut is melted at high temperature and then smelted. The molten steel is cast to produce a blank. After the blank is solution treated, it is naturally cooled in the air to obtain a solid solution. The solid solution is fed into a cold heading machine through a feeding device for forging to obtain the nut blank.

[0058] Quenching treatment: The nut blank is quenched and tempered to obtain a semi-finished nut.

[0059] Annealing treatment: Cool the semi-finished nuts to room temperature and then anneal them.

[0060] After the semi-finished nut is cooled, it is chamfered and deburred in sequence. According to the design process dimensions, it is threaded and grooved to form a fastening ring cavity 111. The thermal expansion and contraction arc plate 23 is embedded in the fastening ring cavity 111 to form a limit, and the finished nut is obtained.

[0061] Heat treatment involves sequentially performing heat treatment, aging treatment, and tempering treatment on the finished nuts to enhance their structural strength.

[0062] The implementation principle of a high-strength nut processing technology in this application embodiment is as follows: during the nut production process, the internal stress of the nut is eliminated by solution treatment, the structure and size of the nut are stabilized, and the mechanical properties of the nut are enhanced; at the same time, the strength of the nut is improved by heat treatment.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-strength nut, characterized in that: The device includes a cap body (1) and a fastening assembly (2). The inner ring wall of the cap body (1) is coaxially provided with a fastening ring cavity (111) for accommodating the fastening assembly (2). The fastening assembly (2) includes a thermally expanding and contracting arc plate (23), which is embedded in the fastening ring cavity (111). The inner arc surface of the thermally expanding and contracting arc plate (23) is used to abut against the outer wall of the bolt to form a fixation. When the thermally expanding and contracting arc plate (23) heats up and expands, the fastening force between the inner arc surface of the thermally expanding and contracting arc plate (23) and the outer wall of the fastening bolt increases. The fastening assembly (2) also includes a fastening ring bladder (21) and a fastening piston (22). The outer ring wall of the fastening ring bladder (21) is coaxially connected to the inner wall of the fastening ring cavity (111). The outer arc surface of the thermally expanding and contracting arc plate (23) is used to abut against the outer wall of the bolt to form a fixation. The cap body (1) is connected to the inner wall of the fastening ring bladder (21). An air passage (113) is provided on the cap body (1) for the fastening piston (22) to slide. The air passage (113) is connected to the inner cavity of the fastening ring bladder (21). The end of the fastening piston (22) protrudes from the end face of the cap body (1) to abut against the end face of the equipment. When the cap body (1) is threadedly connected to the outer wall of the screw, the end face of the equipment abuts against the end of the fastening piston (22) and drives the fastening piston (22) to slide towards the air passage (113). The air in the air passage (113) enters the inner cavity of the fastening ring bladder (21). The fastening ring bladder (21) is pressurized and expanded, and drives the thermal expansion and contraction arc plate (23) to slide towards the axis of the cap body (1) and abut against the outer wall of the screw to form a fixation.

2. The high-strength nut according to claim 1, characterized in that: The cap body (1) has an air passage two (115) which is connected to the inner cavity of the fastening ring bladder (21). A cover plate (4) is rotatably connected to the cap body (1), and the end face of the cover plate (4) covers the air passage two (115) to form a seal.

3. A high-strength nut according to claim 2, characterized in that: A sealing elastic element (5) is connected between the cap body (1) and the cover plate (4). The sealing elastic element (5) has the elasticity to drive the cover plate (4) to rotate toward the air passage two (115) and close the air passage two (115).

4. A high-strength nut according to claim 2, characterized in that: The end face of the cover plate (4) facing the second air passage (115) is connected to a thermal expansion and contraction ring (6), and the outer ring wall of the thermal expansion and contraction ring (6) abuts against the inner wall of the second air passage (115) to form a seal.

5. A high-strength nut according to claim 2, characterized in that: The fastening assembly (2) further includes a fastening elastic element (24), one end of which is connected to the inner wall of the air passage (113) in the elastic direction, and the other end of which is connected to the end face of the fastening piston (22). The fastening elastic element (24) has the elastic force to drive the fastening piston (22) to slide towards the axis of the cap (1), and the end of the fastening piston (22) tends to protrude from the end face of the cap (1).

6. A high-strength nut according to claim 2, characterized in that: The fastening assembly (2) further includes a clamping elastic element (25), one end of which is connected to the inner wall of the fastening ring cavity (111) in the elastic direction, and the other end of which is connected to the end face of the thermal expansion and contraction arc plate (23). The clamping elastic element (25) has the tendency to force the thermal expansion and contraction arc plate (23) to slide away from the axis of the cap body (1).

7. A high-strength nut according to claim 6, characterized in that: The cap body (1) is connected to an opening and closing assembly (7). The inner ring wall of the fastening ring cavity (111) is provided with an opening and closing cavity (117). The opening and closing cavity (117) is connected to the air passage (113). The opening and closing assembly (7) includes an opening and closing gear (71) and an opening and closing arc plate (72). The opening and closing arc plate (72) is slidably connected to the inner wall of the fastening ring cavity (111). The sliding direction of the opening and closing arc plate (72) is parallel to the axis of the cap body (1). The outer arc surface of the opening and closing arc plate (72) abuts against the inner arc surface of the thermal expansion and contraction arc plate (23) to form a limit. The opening and closing gear (71) is rotatably connected to the inner wall of the opening and closing cavity (117). The opening and closing arc plate (72) The gear (71) has a toothed groove (721) that meshes with the gear (71), and the fastening piston (22) has a toothed groove (221) that meshes with the gear (71). The opening and closing arc plate (72) and the fastening piston (22) are located on both sides of the gear (71). When the fastening piston (22) slides toward the air passage (113), the gear (71) rotates, driving the opening and closing arc plate (72) to slide away from the opening and closing cavity (117). The outer arc surface of the opening and closing arc plate (72) disengages from the inner arc surface of the thermal expansion and contraction arc plate (23), and the clamping effect of the opening and closing arc plate (72) on the thermal expansion and contraction arc plate (23) disappears.

8. A high-strength nut according to claim 1, characterized in that: The inner arc surface of the thermal expansion and contraction arc plate (23) is provided with multiple deformation grooves (231) spaced apart. The inner wall of the deformation groove (231) deforms and abuts against the outer wall of the screw to form a fixed shape.

9. A high-strength nut processing technology, characterized in that: The process for producing the high-strength nut according to claim 1 includes the following steps: In the initial processing, the raw material of the nut is melted at high temperature and then smelted. The molten steel is cast to produce a blank. After the blank is solution treated, it is naturally cooled in the air to obtain a solid solution. The solid solution is fed into a cold heading machine through a feeding device for forging to obtain the nut blank. Quenching treatment: The nut blank is quenched and tempered to obtain a semi-finished nut. Annealing treatment: Cool the semi-finished nuts to room temperature and then anneal them. After the semi-finished nut is cooled, it is chamfered and deburred in sequence. According to the design process dimensions, it is threaded and grooved on the inner wall to form a fastening ring cavity (111). The thermal expansion and contraction arc plate (23) is embedded in the fastening ring cavity (111) to form a limit, and the finished nut is obtained. Heat treatment involves sequentially performing heat treatment, aging treatment, and tempering treatment on the finished nuts to enhance their structural strength.

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