阅读说明：本技术 一种核电用螺栓及其生产工艺 (Bolt for nuclear power and production process thereof ) 是由 钱文超 马贤明 张鹏轲 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种核电用螺栓及其生产工艺,包括栓体、安装组件与内栓体,所述栓体和安装组件通过螺纹连接拆开或合成一个整体,所述内栓体安装在栓体内壁,所述栓体包括螺头,所述螺头内壁开设有限位槽一,所述螺头顶部固定安装有栓柱。本发明通过内栓体与栓柱螺纹连接,使用工具旋转底座的凹槽,使内栓体旋转向外移动,同时塞柱的胶头与栓柱的通孔脱离,使储胶腔内的除锈剂与润滑油通过通孔溢出,经螺槽口将除锈剂与润滑油渗透到螺栓内,去除锈蚀部分,便于螺栓轻松地旋下,当螺栓锈蚀部分较为严重,不可取下时,使用冲击工具锤击螺杆二的折断区,使螺杆二脱落,旋下正螺母,使螺栓脱落,具有发生锈蚀时便于拆卸的作用。(The invention discloses a bolt for nuclear power and a production process thereof, and the bolt comprises a bolt body, a mounting assembly and an inner bolt body, wherein the bolt body and the mounting assembly are connected and disassembled or integrated into a whole through threads, the inner bolt body is mounted on the inner wall of the bolt body, the bolt body comprises a bolt head, the inner wall of the bolt head is provided with a first limiting groove, and the top of the bolt head is fixedly provided with a bolt post. The inner bolt body is connected with the bolt column through threads, the tool is used for rotating the groove of the base, the inner bolt body is rotated and moves outwards, the rubber head of the plug column is separated from the through hole of the bolt column, the rust remover and the lubricating oil in the rubber storage cavity are enabled to overflow through the through hole, the rust remover and the lubricating oil are permeated into the bolt through the groove opening of the bolt, the rusted part is removed, the bolt can be conveniently and easily screwed down, when the rusted part of the bolt is serious and can not be taken down, the impact tool is used for hammering the fracture area of the screw rod II, the screw rod II is enabled to fall off, the positive nut is screwed down, the bolt is enabled to fall off, and the tool has the effect of facilitating dismounting when rusting occurs.)

1. A bolt for nuclear power comprises a bolt body (100), a mounting assembly (200) and an inner bolt body (300), wherein the bolt body (100) and the mounting assembly (200) are connected through threads and are disassembled or combined into a whole, the inner bolt body (300) is mounted on the inner wall of the bolt body (100), and the bolt is characterized in that: the bolt body (100) comprises a bolt head (110), a first limiting groove (110) is formed in the inner wall of the bolt head (110), a bolt column (120) is fixedly mounted at the top of the bolt head (110), a second limiting groove (122) is formed in the inner wall of the bolt column (120), the first limiting groove (110) and the second limiting groove (122) are connected with each other, and through holes (121) are formed in two sides of the outer wall of the bolt column (120);

interior key body (300) are including stopper post (330), stopper post (330) one side fixed mounting has base (310), stopper post (330) and base (310) are installed respectively at spacing groove two (122) and spacing groove one (110) inner wall, stopper post (330) inner wall top has been seted up and has been stored up and has been glued chamber (350), stopper post (330) outer wall both sides have been seted up and have been kept away cavity (370), store up and glue chamber (350) and keep away cavity (370) interconnect, stopper post (330) top outer wall fixed mounting has gluey head (380), through-hole (121) and spacing groove two (122) interconnect, glue head (380) and through-hole (121) inner wall connection.

2. The bolt for nuclear power as claimed in claim 1, wherein an internal thread (123) is formed on the inner wall of the second limit groove (122), an external thread (340) is formed on the outer wall of the plug (330), the plug (330) is in threaded connection with the second limit groove (122), a glue injection hole (360) is formed on the inner wall of the base (310), and the glue injection hole (360) is connected with the glue storage cavity (350).

3. The bolt for nuclear power as claimed in claim 2, wherein one side of the base (310) is provided with a groove (320), one side of the glue injection hole (360) is inserted with a plug (361), and a sealing ring (390) is installed at the joint of the base (310) and the first limiting groove (110).

4. The bolt for nuclear power as claimed in claim 1, wherein the top of the bolt (120) is fixedly provided with a first screw (130), the top of the first screw (130) is fixedly provided with a first boss (140), the top of the first boss (140) is provided with a second screw (150), the bottom of the second screw (150) is fixedly provided with a second boss (160), the bottom of the second boss (160) is fixedly connected with the top of the first boss (140), the joint of the first boss (140) and the second boss (160) is provided with a fracture area (170), the mounting assembly (200) is mounted on the outer walls of the bolt (120), the first screw (130) and the second screw (150), and the diameter of the second screw (150) is smaller than that of the first screw (130).

5. The bolt for nuclear power according to claim 4, wherein the first screw (130) is provided with a first thread portion (131) on the outer wall thereof, the second screw (150) is provided with a second thread portion (151) on the outer wall thereof, the thread directions of the first thread portion (131) and the second thread portion (151) are opposite, the joint of the first thread portion (131) and the bolt post (120) is provided with two groups of screw notches (132), and the two groups of screw notches (132) are connected with the through hole (121).

6. The bolt for nuclear power as claimed in claim 4, wherein the mounting assembly (200) comprises a counter nut (260), a second wedge groove (261) is formed in one side of the inner wall of the counter nut (260), a first wedge groove (152) is formed in one side of the outer wall of the second screw (150), the counter nut (260) is in threaded connection with the second screw (150), the first wedge groove (152) is matched with the second wedge groove (261), and a wedge strip (180) is inserted into the inner walls of the first wedge groove (152) and the second wedge groove (261).

7. The bolt for nuclear power as claimed in claim 4, wherein the outer wall of the stud (120) is provided with a first nut gasket (210), the outer wall of the first screw (130) is provided with a second nut gasket (220), the top of the second nut gasket (220) is provided with a positive nut (230), the positive nut (230) is in threaded connection with the first screw (130), and the outer walls of the first boss (140) and the second boss (160) are provided with a first clamping piece (240) and a second clamping piece (250).

8. The bolt for nuclear power as claimed in claim 7, wherein the second clamping piece (250) is installed at the top of the first clamping piece (240), rough grains (252) are uniformly formed in the top of the second clamping piece (250), and the top of the second clamping piece (250) is connected with the bottom of the counter nut (260).

9. The bolt for the nuclear power as claimed in claim 7, wherein a second stepped insection (251) is formed at the bottom of the second clamping piece (250), a first stepped insection (242) is formed at the top of the first clamping piece (240), the first stepped insection (242) is matched with the second stepped insection (251) for use, an elastic rubber ring (241) is fixedly mounted at the bottom of the first clamping piece (240), and the bottom of the elastic rubber ring (241) is connected with the top of the positive nut (230).

10. A production process of a bolt for nuclear power comprises the following operation steps:

the method comprises the following steps: adopting 4321H stainless steel as a raw material, and respectively quenching and tempering bolts less than 0.5M and bolts more than or equal to 0.5M by a blank preparation-heat treatment-surface treatment-flaw detection process of the heat treatment process of the 4321H stainless steel; quenching bolts with the length less than 0.5M in a mesh belt furnace, wherein the quenching temperature is 850-880 ℃, the heat preservation time is more than 2 hours, and the quenching medium is alloy steel quenching oil; the bolt with the length being more than or equal to 0.5M is quenched by a pit furnace, the quenching temperature is 850-880 ℃, the quenching medium is mechanical oil, and the heat preservation time is more than or equal to 2.5 hours; secondly, tempering, wherein bolts with the length less than 0.5M are tempered in a mesh belt furnace, the tempering temperature is 600-680 ℃, and the heat preservation time is more than 2 hours; tempering the bolt with the length of more than or equal to 0.5M by using a pit furnace, wherein the tempering temperature is 600-680 ℃, and the time is more than or equal to 3 hours;

step two: eliminating surface cracks or defects of raw materials by using a comprehensive grinding process, forming steel into a correct shape at room temperature, forcing the steel to enter a grinding tool for forming under high pressure, forming threads by cutting, hardening a steel section by heat treating a bolt in an extremely hot environment, and eliminating the surface cracks or defects of the cut steel by using the comprehensive grinding process;

step four: performing hardness detection on the bolt blank, selecting one bolt with the highest hardness and the lowest hardness for mechanical property detection of normal temperature stretching, 350 ℃ yield strength and HB hardness, wherein the diameter of the bolt is more than or equal to 15mm, adding 0 ℃ CAKV impact detection, performing complete heat treatment again when the detection does not meet the standard, and performing scrap treatment when the detection does not meet the standard;

step four: after heat treatment, the steel section is subjected to thread grinding blank diameter and thread rolling to form a bolt prototype;

step five: drilling a screw head (110) of the bolt, drilling a first limit groove (110), drilling the bottom and the side surface of a bolt column (120) of the bolt, respectively drilling a second limit groove (122) and a through hole (121), performing tangent plane on one side of a second screw rod (150) of the bolt, and drilling a first wedge groove (152), and then eliminating surface cracks or defects of the bolt by using a comprehensive grinding process;

step six: performing chromium plating treatment on the bolt surface, wherein the thickness of the chromium plating treatment is 5-10 mu m, and coating molybdenum disulfide on the surface of the plating layer after visual inspection;

step seven: the thermal treatment production line of the mesh belt furnace and an imported carbon potential control instrument are adopted to ensure stable thermal treatment quality, and product consistency and mechanical property 100% qualification are ensured through various total detection procedures of one-by-one spectrum detection, hardness nondestructive sorting, straightness straightening, magnetic powder inspection and the like.

Technical Field

The invention relates to the technical field of bolts, in particular to a bolt for nuclear power and a production process thereof.

Background

The nuclear power plant is a power facility which generates electricity or generates electricity and supplies heat by utilizing heat energy generated by one or a plurality of power reactors. The fuel used in the nuclear power station is uranium, the nuclear fuel made of uranium is fissured in equipment of a reactor to generate a large amount of heat energy, the heat energy is taken out by water under high pressure, steam is generated in a steam generator, the steam pushes a steam turbine to drive a generator to rotate together, electricity is continuously generated and is sent to all directions through a power grid, bolts are widely applied to connection of assembling parts such as a reactor pressure vessel and a voltage stabilizer of the nuclear power station to ensure normal work in the reactor pressure vessel, and the purpose of safe work of the nuclear power station is achieved.

Under the operating conditions of high temperature, high pressure and high radioactivity, the existing bolt is subjected to scouring of water flow, vibration of equipment or impact of foreign matters entering a system on the equipment and the like, so that the bolt on the original equipment is possible to loosen, even rust of the bolt is caused for a long time, the bolt is not detachable, the bolt can continuously operate under the working environment of high temperature, high pressure, high flow and strong radioactivity, the potential safety hazard of operation of the equipment and the system can be caused, and even nuclear safety accidents can be caused.

Disclosure of Invention

The invention aims to solve the problem that a bolt is rusted and not detachable in the prior art, and provides a bolt for nuclear power and a production process thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a bolt for nuclear power comprises a bolt body, a mounting assembly and an inner bolt body, wherein the bolt body and the mounting assembly are connected and disassembled or combined into a whole through threads;

the inner plug body comprises a plug, a base is fixedly mounted on one side of the plug, the plug and the base are respectively mounted on the inner walls of a limit groove two and a limit groove one, the top of the inner wall of the plug is provided with a glue storage cavity, two sides of the outer wall of the plug are provided with a cavity, the glue storage cavity and the cavity are connected with each other, the outer wall of the top of the plug is fixedly mounted with a glue head, a through hole is connected with the two sides of the limit groove, and the glue head is connected with the inner wall of the through hole.

Preferably, an internal thread is formed on the inner wall of the second limiting groove, an external thread is formed on the outer wall of the plug, the plug is in threaded connection with the second limiting groove, a glue injection hole is formed in the inner wall of the base, and the glue injection hole is connected with the glue storage cavity.

Preferably, one side of the base is provided with a groove, one side of the glue injection hole is plugged with a plug, and a sealing ring is arranged at the joint of the base and the limiting groove.

Preferably, a first screw rod is fixedly mounted at the top of the stud, a first boss is fixedly mounted at the top of the first screw rod, a second screw rod is arranged at the top of the first boss, a second boss is fixedly mounted at the bottom of the second screw rod, the bottom of the second boss is fixedly connected with the top of the first boss, a fracture area is arranged at the joint of the first boss and the second boss, the mounting assembly is mounted on the outer walls of the stud, the first screw rod and the second screw rod, and the diameter of the second screw rod is smaller than that of the first screw rod.

Preferably, a first thread part is formed in the outer wall of the first screw, a second thread part is formed in the outer wall of the second screw, the thread directions of the first thread part and the second thread part are opposite, two groups of screw notches are formed in the joint of the first thread part and the stud, and the two groups of screw notches are connected with the through hole.

Preferably, the mounting assembly comprises a counter nut, a wedge groove II is formed in one side of the inner wall of the counter nut, a wedge groove I is formed in one side of the outer wall of the screw rod, the counter nut is in threaded connection with the screw rod II, the wedge groove I is matched with the wedge groove II for use, and a wedge strip is inserted into the inner wall of the wedge groove I and the inner wall of the wedge groove II.

Preferably, the outer wall of the bolt column is provided with a first nut gasket, the outer wall of the first screw rod is provided with a second nut gasket, the top of the second nut gasket is provided with a positive nut, the positive nut is in threaded connection with the first screw rod, and the first boss and the outer wall of the boss are provided with a first clamping sheet and a second clamping sheet.

Preferably, the second clamping piece is installed at the top of the first clamping piece, rough grains are uniformly formed in the top of the second clamping piece, and the top of the second clamping piece is connected with the bottom of the reverse nut.

Preferably, step insection two has been seted up to chucking piece two bottoms, step insection one has been seted up at chucking piece one top, step insection one uses with the cooperation of step insection two, chucking piece one bottom fixed mounting has the elastic rubber circle, elastic rubber circle bottom is connected with the positive nut top.

A production process of a bolt for nuclear power comprises the following operation steps:

the method comprises the following steps: adopting 4321H stainless steel as a raw material, and respectively quenching and tempering bolts less than 0.5M and bolts more than or equal to 0.5M by a blank preparation-heat treatment-surface treatment-flaw detection process of the heat treatment process of the 4321H stainless steel; quenching bolts with the length less than 0.5M in a mesh belt furnace, wherein the quenching temperature is 850-880 ℃, the heat preservation time is more than 2 hours, and the quenching medium is alloy steel quenching oil; the bolt with the length being more than or equal to 0.5M is quenched by a pit furnace, the quenching temperature is 850-880 ℃, the quenching medium is mechanical oil, and the heat preservation time is more than or equal to 2.5 hours; secondly, tempering, wherein bolts with the length less than 0.5M are tempered in a mesh belt furnace, the tempering temperature is 600-680 ℃, and the heat preservation time is more than 2 hours; and (3) tempering the bolt with the length of more than or equal to 0.5M by using a pit furnace, wherein the tempering temperature is 600-680 ℃, and the time is more than or equal to 3 hours.

Step two: the method comprises the steps of eliminating surface cracks or defects of raw materials by using a comprehensive grinding process, forming steel into a correct shape at room temperature, forcing the steel into a grinding tool for forming under high pressure, forming threads by cutting, hardening a steel section by heat treating bolts in an extremely hot environment, and eliminating the surface cracks or defects of the cut steel by using the comprehensive grinding process.

Step four: and (3) performing hardness detection on the bolt blank, selecting one bolt with the highest hardness and the lowest hardness for mechanical property detection of normal temperature stretching, yield strength at 350 ℃ and HB hardness, wherein the diameter of the bolt is more than or equal to 15mm, adding 0-DEG CAKV impact detection, performing complete heat treatment again when the detection does not meet the standard, and discarding when the detection does not meet the standard.

Step four: and after the steel section is subjected to heat treatment, grinding the diameter of a thread blank and rolling threads to form a bolt prototype.

Step five: drilling the head of the bolt, drilling the bottom and the side surface of the bolt column of the bolt by using the first limiting groove, respectively drilling the second limiting groove and the through hole, performing tangent plane on one side of the screw rod of the bolt, and drilling the first wedge groove, and then eliminating surface cracks or defects of the bolt by using a comprehensive grinding process.

Step six: and performing chromium plating treatment on the bolt surface, wherein the thickness is 5-10 mu m, and coating molybdenum disulfide on the surface of the plating layer after visual inspection.

Step seven: the thermal treatment production line of the mesh belt furnace and an imported carbon potential control instrument are adopted to ensure stable thermal treatment quality, and product consistency and mechanical property 100% qualification are ensured through various total detection procedures of one-by-one spectrum detection, hardness nondestructive sorting, straightness straightening, magnetic powder inspection and the like.

Compared with the prior art, the invention has the beneficial effects that:

1. the inner bolt body is connected with the bolt through the threads, the tool is used for rotating the groove of the base, so that the inner bolt body rotates and moves outwards, the rubber head of the plug is separated from the through hole of the bolt, the rust remover and the lubricating oil in the rubber storage cavity overflow through the through hole, the rust remover and the lubricating oil are permeated into the bolt through the groove opening of the bolt, a rusted part is removed, the bolt is convenient to easily screw down, when the rusted part of the bolt is serious and can not be taken down, the impact tool is used for hammering the fracture area of the screw rod II, the screw rod II is made to fall off, the positive nut is screwed down, the bolt is made to fall off, and the tool has the effect of being convenient to disassemble when rusting occurs;

2. the bolt is characterized in that a first nut gasket is sleeved on the outer wall of the bolt column, the bolt body is inserted into a through hole of an object to be fixed, the nut gasket is sleeved on a first screw rod after insertion, a positive nut is installed on the outer wall of the first screw rod, the positive nut is rotated to enable the object to be fixed to be clamped tightly, a first clamping sheet and a second clamping sheet are installed in sequence, a reverse nut is installed on the second screw rod, the reverse nut is rotated to enable the first clamping sheet and the second clamping sheet to be closed, the positive nut is prevented from loosening, a wedge strip is inserted into a first wedge groove and a second wedge groove, the reverse nut is prevented from loosening, and the bolt is prevented from loosening.

Drawings

Fig. 1 is a schematic front view of the structure of embodiment 1 of the present invention;

FIG. 2 is a schematic view of the structure of the plug body of example 1 of the present invention;

FIG. 3 is a schematic view of an inner plug body mounting structure according to embodiment 1 of the present invention;

FIG. 4 is a schematic cross-sectional view of a plug according to example 1 of the present invention;

FIG. 5 is a schematic structural view of an inner plug according to embodiment 1 of the present invention;

FIG. 6 is a schematic structural view of a first chuck sheet and a second chuck sheet in embodiment 1 of the present invention;

FIG. 7 is a schematic structural view of a counter nut according to embodiment 1 of the present invention;

FIG. 8 is a schematic view of a mounting method according to embodiment 1 of the present invention;

fig. 9 is a schematic view of a second mounting method in embodiment 1 of the present invention.

In the figure: 100 bolt bodies, 110 screw heads, 110 first limit grooves, 120 bolts, 121 through holes, 122 second limit grooves, 123 internal threads, 130 screw rods I, 131 first thread parts, 132 screw groove openings, 140 boss I, 150 screw rods II, 151 second thread parts, 152 wedge groove I, 160 boss II, 170 breaking areas, 180 wedge strips, 200 mounting assemblies, 210 nut gasket I, 220 nut gasket II, 230 positive nuts, 240 clamping piece I, 241 elastic rubber rings, 242 stepped tooth thread I, 250 clamping piece II, 251 stepped tooth thread II, 252 rough threads, 260 counter nuts, 261 wedge groove II, 300 inner bolt bodies, 310 bases, 320 grooves, 330 plugs, 340 external threads, 350 glue storage cavities, 360 glue injection holes, 361 plugs, 370 cavities, 380 glue heads and 390 sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Embodiment 1, referring to fig. 1 to 9, a bolt for nuclear power includes a bolt body 100, a mounting assembly 200, and an inner bolt body 300, wherein the bolt body 100 and the mounting assembly 200 are connected by a screw thread to be disassembled or integrated into a whole, specifically, the inner bolt body 300 is mounted on an inner wall of the bolt body 100, the bolt body 100 includes a bolt head 110, a first limiting groove 110 is formed on an inner wall of the bolt head 110, a bolt post 120 is fixedly mounted on a top of the bolt head 110, a second limiting groove 122 is formed on an inner wall of the bolt post 120, the first limiting groove 110 and the second limiting groove 122 are connected with each other, through holes 121 are formed on two sides of an outer wall of the bolt post 120, the bolt body 100 has a mounting effect on the bolt body 300, and the bolt head 110 and the bolt post 120 are of an integrated structure;

the inner plug body 300 comprises a plug 330, a base 310 is fixedly installed on one side of the plug 330, the plug 330 and the base 310 are respectively installed on the inner walls of a second limit groove 122 and a first limit groove 110, a glue storage cavity 350 is formed in the top of the inner wall of the plug 330, cavity avoiding cavities 370 are formed in two sides of the outer wall of the plug 330, the glue storage cavity 350 is mutually connected with the cavity avoiding cavities 370, a glue head 380 is fixedly installed on the outer wall of the top of the plug 330, a through hole 121 is mutually connected with the second limit groove 122, the glue head 380 is connected with the inner wall of the through hole 121, the plug 330 and the base 310 are of an integrated structure, the second limit groove 122 and the first limit groove 110 have an installation function on the plug 330 and the base 310, the glue storage cavity 350 has a function of storing a rust remover and lubricating oil, the cavity avoiding cavities 370 and the glue storage cavity 350 are mutually connected, the effect of increasing the storage area of the glue storage cavity 350 is achieved, the cavity 370 can achieve an unloading function through elastic deformation when bearing a large load, and can prevent the plug 330 from being difficult to disassemble, the bending amount of the plug 330 can be limited when the plug 120 is elastically deformed, the plug 330 is prevented from being broken due to overlarge bending amount, the service life and the maintenance period of the plug 330 are prolonged, the plug 330 has a fixing effect on the rubber head 380, the rubber head 380 is made of rubber, has a certain sealing effect on the through hole 121 when being connected with the through hole 121, and has an effect of preventing leakage of the rust remover and the lubricating oil, the through hole 121 is communicated with the second limiting groove 122, and the through hole 121 and the rubber head 380 have an effect of overflowing the rust remover and the lubricating oil when being separated;

the inner wall of the second limiting groove 122 is provided with an internal thread 123, the outer wall of the plug 330 is provided with an external thread 340, the plug 330 is in threaded connection with the second limiting groove 122, the inner wall of the base 310 is provided with a glue injection hole 360, the glue injection hole 360 is mutually connected with the glue storage cavity 350, specifically, the plug 330 is in threaded connection with the inner wall of the plug 120 through the external thread 340 and the internal thread 123 of the second limiting groove 122, and the glue injection hole 360 has the function of supplementing a rust remover and lubricating oil to enter the glue storage cavity 350;

a groove 320 is formed in one side of the base 310, a plug 361 is inserted into one side of the glue injection hole 360, a sealing ring 390 is installed at the joint of the base 310 and the first limiting groove 110, and specifically, when the groove 320 is rotated by using a tool, the inner bolt body 300 can be integrally taken out of the inner wall of the bolt post 120;

the top of the bolt column 120 is fixedly provided with a first screw 130, the top of the first screw 130 is fixedly provided with a first boss 140, the top of the first boss 140 is provided with a second screw 150, the bottom of the second screw 150 is fixedly provided with a second boss 160, the bottom of the second boss 160 is fixedly connected with the top of the first boss 140, the joint of the first boss 140 and the second boss 160 is provided with a fracture area 170, the mounting assembly 200 is arranged on the outer walls of the bolt column 120, the first screw 130 and the second screw 150, the diameter of the second screw 150 is smaller than that of the first screw 130, concretely, the bolt column 120, the first screw 130, the first boss 140, the second boss 160 and the second screw 150 are of an integrated structure, the first boss 140 and the second boss 160 are symmetrically arranged, the joint is more fragile compared with other parts, and the fracture area 170 is an area for a worker to fracture under specific conditions;

the outer wall of the first screw 130 is provided with a first screw thread part 131, the outer wall of the second screw 150 is provided with a second screw thread part 151, the screw thread directions of the first screw thread part 131 and the second screw thread part 151 are opposite, the joint of the first screw thread part 131 and the stud 120 is provided with two screw groove openings 132, the two screw groove openings 132 are connected with the through hole 121, specifically, the screw groove opening 132 is a first contact point of the first screw thread part 131 and the stud 120, and the screw groove opening 132 has the function of enabling the rust removing agent and the lubricating oil overflowing from the through hole 121 to flow into the groove of the first screw thread part 131;

the mounting assembly 200 comprises a counter nut 260, a wedge groove II 261 is formed in one side of the inner wall of the counter nut 260, a wedge groove I152 is formed in one side of the outer wall of the screw rod II 150, the counter nut 260 is in threaded connection with the screw rod II 150, the wedge groove I152 is matched with the wedge groove II 261 for use, a wedge strip 180 is inserted into the inner wall of the wedge groove I152 and the inner wall of the wedge groove II 261, specifically, the screw rod II 150 has a mounting effect on the counter nut 260, and the wedge groove I152 and the wedge groove II 261 have a mounting effect on the wedge strip 180;

the outer wall of the bolt column 120 is provided with a first nut gasket 210, the outer wall of the first screw 130 is provided with a second nut gasket 220, the top of the second nut gasket 220 is provided with a positive nut 230, the positive nut 230 is in threaded connection with the first screw 130, the outer walls of the first boss 140 and the second boss 160 are provided with a first clamping sheet 240 and a second clamping sheet 250, the first nut gasket 210 and the second nut gasket 220 have the effects of increasing contact area, reducing pressure and protecting parts, and the first clamping sheet 240 and the second clamping sheet 250 have the effects of increasing friction and preventing the positive nut 230 and the reverse nut 260 from loosening;

the second clamping piece 250 is arranged at the top of the first clamping piece 240, rough grains 252 are uniformly formed in the top of the second clamping piece 250, the top of the second clamping piece 250 is connected with the bottom of the counter nut 260, and specifically, the rough grains 252 are provided with radial saw teeth;

step insection two 251 is seted up to two 250 bottoms of chucking piece, and step insection one 242 has been seted up at one 240 tops of chucking piece, and step insection one 242 uses with the cooperation of step insection two 251, and one 240 bottoms fixed mounting of chucking piece has elastic rubber circle 241, and elastic rubber circle 241 bottom is connected with positive nut 230 top, and is concrete, and step insection one 242 is the wedge with step insection two 251, and step insection one 242 takes place the displacement with step insection two 251 during the installation and makes it screw up the closure, reaches required pretightning force.

The using process of the invention is as follows: when the bolt body 100 is rusted, a worker in the field needs to sleeve the outer wall of the bolt 120 into the first nut gasket 210, insert the bolt body 100 into a through hole of an object to be fixed, sleeve the second nut gasket 220 into the first screw 130 after insertion, install the positive nut 230 on the outer wall of the first screw 130 because the diameter of the second screw 150 is smaller than that of the first screw 130, rotate the positive nut 230 to clamp the fixed object, sequentially install the first clamping sheet 240 and the second clamping sheet 250, install the reverse nut 260 on the second screw 150, rotate the reverse nut 260 to close the first clamping sheet 240 and the second clamping sheet 250 to prevent the positive nut 230 from loosening, insert the wedge strip 180 into the first wedge groove 152 and the second wedge groove 261 to prevent the reverse nut 260 from loosening, take out the blockage 361, inject a rust remover and lubricating oil into the glue storage cavity 350 through the glue injection hole 360, rotate the groove 320 of the base 310 by using a tool when the bolt body 100 is rusted, and are connected with the bolt body 120 through threads, the inner bolt body 300 is rotated to move outwards, meanwhile, the rubber head 380 of the plug 330 is separated from the through hole 121 of the bolt 120, so that the rust remover and the lubricating oil in the rubber storage cavity 350 overflow through the through hole 121, the rust remover and the lubricating oil permeate into the bolt through the screw groove opening 132, the rusted part is removed, the bolt is convenient to unscrew easily, when the rusted part of the bolt is serious and cannot be taken down, the impact tool is used for hammering the fracture area 170 of the screw rod II 150, the screw rod II 150 is made to fall off, the positive nut 230 is unscrewed, the bolt is made to fall off, and loss is reduced.

Example 2:

a production process of a bolt for nuclear power comprises the following operation steps:

the method comprises the following steps: adopting 4321H stainless steel as a raw material, and respectively quenching and tempering bolts less than 0.5M and bolts more than or equal to 0.5M by a blank preparation-heat treatment-surface treatment-flaw detection process of the heat treatment process of the 4321H stainless steel; quenching bolts with the length less than 0.5M in a mesh belt furnace, wherein the quenching temperature is 850-880 ℃, the heat preservation time is more than 2 hours, and the quenching medium is alloy steel quenching oil; the bolt with the length being more than or equal to 0.5M is quenched by a pit furnace, the quenching temperature is 850-880 ℃, the quenching medium is mechanical oil, and the heat preservation time is more than or equal to 2.5 hours; secondly, tempering, wherein bolts with the length less than 0.5M are tempered in a mesh belt furnace, the tempering temperature is 600-680 ℃, and the heat preservation time is more than 2 hours; and (3) tempering the bolt with the length of more than or equal to 0.5M by using a pit furnace, wherein the tempering temperature is 600-680 ℃, and the time is more than or equal to 3 hours.

Step two: the method comprises the steps of eliminating surface cracks or defects of raw materials by using a comprehensive grinding process, forming steel into a correct shape at room temperature, forcing the steel into a grinding tool for forming under high pressure, forming threads by cutting, hardening a steel section by heat treating bolts in an extremely hot environment, and eliminating the surface cracks or defects of the cut steel by using the comprehensive grinding process.

Step four: and (3) performing hardness detection on the bolt blank, selecting one bolt with the highest hardness and the lowest hardness for mechanical property detection of normal temperature stretching, yield strength at 350 ℃ and HB hardness, wherein the diameter of the bolt is more than or equal to 15mm, adding 0-DEG CAKV impact detection, performing complete heat treatment again when the detection does not meet the standard, and discarding when the detection does not meet the standard.

Step four: and after the steel section is subjected to heat treatment, grinding the diameter of a thread blank and rolling threads to form a bolt prototype.

Step five: drilling a screw head 110 of the bolt, forming a first limiting groove 110, drilling the bottom and the side surface of a bolt column 120 of the bolt, respectively forming a second limiting groove 122 and a through hole 121, cutting one side of a screw rod 150 of the bolt to form a first wedge groove 152, and removing surface cracks or defects of the bolt by using a comprehensive grinding process after finishing.

Step six: and performing chromium plating treatment on the bolt surface, wherein the thickness is 5-10 mu m, and coating molybdenum disulfide on the surface of the plating layer after visual inspection.

Step seven: the heat treatment production line of the mesh belt furnace and an imported carbon potential control instrument are adopted to ensure stable heat treatment quality, and the product consistency and the qualified mechanical property of 100 percent are ensured through various total detection procedures of one-by-one spectrum detection, hardness nondestructive sorting, straightness straightening, magnetic powder inspection and the like

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.