Production process of corrosion-resistant fan base bolt

Abstract

The application provides a production process of a corrosion-resistant fan base bolt, and the steps of the production process are as follows: annealing treatment of wire rod steel material, mechanical descaling treatment, drawing treatment, cold forging forming treatment to obtain a semi-finished product, thread processing treatment to obtain a bolt finished product, heat treatment, and surface galvanizing treatment. The galvanizing equipment comprises a furnace shell, a lifting mechanism, a rotating mechanism and a galvanizing cylinder. The lifting mechanism is arranged at the top center of the inner wall of the furnace shell. The rotating mechanism is arranged on the inner side of the lifting mechanism and connected to the two ends of the bottom of the lifting mechanism. The galvanizing cylinder is arranged on the inner side of the rotating mechanism. The hot galvanizing process is adopted, the corrosion resistance, safety and toughness of the galvanizing layer are enhanced, the service life of the bolt is prolonged, the maintenance frequency of the fan is reduced, the production cost is reduced, the quality of the bolt galvanizing is ensured, the bolt is not easily corroded in the humid environment of the fan for a long time, the stability and safety of the fan are not reduced for a long time, and accidents caused by the collapse of the fan are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bolt processing, in particular to the technical field of production process of corrosion-resistant fan base bolt. BACKGROUND

[0002] The wind turbine is a kind of power equipment for converting wind energy into mechanical energy and then converting the mechanical energy into electric energy. With the increasingly prominent environmental protection problem and the gradually nervous energy supply, wind power generation, as a clean and renewable energy generation method, is paid more and more attention. Wind power generation is also one of the most mature and most scalable power generation methods in new energy power generation technology. Therefore, in recent years, the wind power generation industry in China has developed rapidly.

[0003] Bolt connection is an important assembly method of wind turbine, which is almost involved in all components of wind turbine. Therefore, the quality of the bolt is an important guarantee for the reliable operation of the wind turbine. However, due to the harsh and humid environment of the fan, the bolt is easily corroded for long-term exposure to air and various media in the air. If the corroded bolt is used for a long time, the stability and safety of the fan will be greatly reduced. If the corrosion is serious, it may even cause the fan to collapse and cause accidents. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art and provide a production process of corrosion-resistant fan base bolt, which aims to solve the problem that the bolt is easily corroded for long-term exposure to air and various media in the air due to the harsh and humid environment of the fan. If the corroded bolt is used for a long time, the stability and safety of the fan will be greatly reduced. If the corrosion is serious, it may even cause the fan to collapse and cause accidents.

[0005] To achieve the above purpose, the present application provides a production process of corrosion-resistant fan base bolt, which comprises the following steps:

[0006] a) annealing the wire rod steel material, placing the wire rod steel material to be processed in the furnace, heating the temperature to 710~730 DEG C and keeping for 3 hours, then furnace cooling to about 500 DEG C and air cooling to complete the annealing of the steel material;

[0007] b) mechanically removing the scale of the wire rod steel material after annealing;

[0008] c) drawing the wire rod steel material after the scale removal is completed, and cold drawing the wire rod steel material to the required wire diameter through the drawing die;

[0009] d) cold forging the wire rod after drawing to form a semi-finished bolt;

[0010] e) thread processing of the formed bolt, the semi-finished product formed by the thread rolling plate is formed into the required thread to form the finished product;

[0011] f) heat treatment of the finished bolt, heating-quenching-tempering treatment is sequentially performed;

[0012] g) surface treatment of the bolt after the heat treatment, the bolt is placed into the galvanizing equipment to perform the surface hot galvanizing treatment to obtain the corrosion-resistant fan base bolt.

[0013] As preferred, the galvanizing equipment in the step g) comprises a furnace shell, a lifting mechanism, a rotating mechanism and a galvanizing cylinder, the lifting mechanism is arranged at the top center of the inner wall of the furnace shell, the rotating mechanism is arranged at the inner side of the lifting mechanism and connected with the two ends of the bottom of the lifting mechanism, and the galvanizing cylinder is arranged at the inner side of the rotating mechanism.

[0014] As preferred, the furnace shell comprises a furnace outer shell and a furnace inner wall, the middle to bottom and the bottom between the furnace outer shell and the furnace inner wall are provided with a heat insulation layer, the heating device is arranged above the center of the bottom of the furnace inner wall, and the temperature control device is arranged on the outer surface of one side of the furnace outer shell, which can sense and accurately control the temperature in the furnace to prevent the temperature in the furnace from being too high or too low, and the heat insulation layer can enhance the heat preservation effect of the galvanizing equipment and prevent the temperature of the furnace outer shell from being too high to scald the workers.

[0015] As preferred, the lifting mechanism comprises a lifting cylinder, a first mounting frame, a rotating rod, a second mounting frame and a galvanizing cylinder, the lifting cylinder is provided with a lifting rod in the middle, the first mounting frame and the second mounting frame are both n-shaped, the bottom of the lifting cylinder is arranged in an inverted state and abuts against the top center of the furnace inner wall of the furnace shell, the middle of the lifting rod of the lifting cylinder is connected with the center of the second mounting frame, the bottom of the lifting rod of the lifting cylinder is connected with the center of the first mounting frame, the two ends of the bottom of the second mounting frame are connected with the top of the first mounting frame, the spring members are sleeved on the two side edges of the second mounting frame, the two ends of the bottom of the first mounting frame are provided with the rotating rods, and the end of the rotating rod away from the first mounting frame is connected with the center of the side surface of the galvanizing cylinder, which is reasonable and simple in structure and is more convenient for lowering the galvanizing cylinder into the hot zinc liquid to complete the hot galvanizing of the bolt, and the spring members arranged on the second mounting frame can buffer the force of the downward movement of the lifting cylinder to prevent the splashing of the hot zinc liquid.

[0016] As preferred, the rotating mechanism comprises rotating motors, rotating rods, transmission belts, baffles and fans, the rotating motors are arranged at the inner sides of the two sides of the first mounting frame close to the top, the rotating rods are connected between the rotating motors, the rotating rods are provided with a plurality of transmission belts close to the two ends, one side of the transmission belts is arranged on the rotating rod, the other side of the transmission belts is arranged on the rotating rod, the rotating motors are provided with the baffles below, the baffles are located inside the transmission belts, the fans are arranged below the middle part of the baffles, the rotating rods are driven to rotate by the rotating motors, the rotating rods drive the rotating rod to rotate through the transmission belts, the zinc cylinder can be rotated to shake off the excess zinc liquid on the bolt, the quality of the bolt galvanizing is ensured, the waste of the zinc liquid is avoided, the baffles can prevent the zinc liquid from being shaken to the upper part of the furnace inner wall during the rotation of the zinc cylinder, and the fans can accelerate the cooling of the bolt after the hot galvanizing.

[0017] As preferred, the zinc cylinder comprises a cylinder cover and a cylinder body, the middle part of the side away from the cylinder body of the cylinder cover is provided with a rectangular tenon, the rectangular tenon is provided with a rotatable round rod, the middle part of the side away from the cylinder cover of the cylinder body is provided with a rectangular hollow tenon, the length of the rectangular hollow tenon is equal to the length of the round rod, and the width of the rectangular hollow tenon is equal to the width of the rectangular tenon, so that the structure is simple and convenient, the round rod is rotated by 90° after penetrating through the hollow tenon and is clamped, and the opening and closing of the zinc cylinder are more convenient.

[0018] The application has the advantages that the zinc plating equipment of the corrosion-resistant fan base bolt is developed by using the hot galvanizing process, the corrosion resistance, safety and toughness of the zinc plating layer are enhanced, the service life of the bolt is prolonged, the maintenance frequency of the fan is reduced, the operation process is more time-saving and labor-saving, the production cost is reduced, the excess zinc liquid on the bolt is shaken off by the rotating structure in the zinc plating equipment, the quality of the bolt galvanizing is ensured, the working environment of the fan is harsh and humid, the bolt is easily corroded for long-term exposure to air, the stability and safety of the fan are greatly reduced if the corroded bolt is used for a long time, and the fan may even collapse to cause an accident if the corrosion is serious.

[0019] The features and advantages of the application will be described in detail with reference to the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a zinc plating equipment structure schematic view of the corrosion-resistant fan base bolt.

[0021] Figure 2 It is a furnace shell structure schematic view of the zinc plating equipment of the corrosion-resistant fan base bolt.

[0022] Figure 3 It is a lifting mechanism structure schematic view of the zinc plating equipment of the corrosion-resistant fan base bolt.

[0023] Figure 4 is a structure diagram of a rotating mechanism in a galvanizing equipment for corrosion-resistant fan base bolts of the application;

[0024] Figure 5 is a structure diagram of a rotating mechanism in a galvanizing equipment for corrosion-resistant fan base bolts of the application;

[0025] Figure 6 is a structure diagram of a galvanizing cylinder in a galvanizing equipment for corrosion-resistant fan base bolts of the application;

[0026] In the figure: 1 - furnace shell, 2 - lifting mechanism, 3 - rotating mechanism, 4 - galvanizing cylinder, 11 - furnace outer shell, 12 - furnace inner wall, 13 - heat insulation layer, 14 - temperature control device, 15 - heating device, 21 - lifting cylinder, 22 - first mounting bracket, 23 - rotating rod, 24 - second mounting bracket, 25 - spring piece, 31 - rotating motor, 32 - rotating rod, 33 - transmission belt, 34 - baffle, 35 - fan, 41 - cylinder cover, 42 - cylinder body, 43 - rectangular tenon, 44 - round rod, 45 - rectangular hollow tenon, 211 - lifting rod. DETAILED DESCRIPTION

[0027] To make the object, technical scheme and advantages of the present application more clear, the present application is further described in detail below with the help of the drawings and examples. However, it should be understood that the specific examples described here are only used to explain the present application, and are not used to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0028] Example 1

[0029] a) annealing the wire rod steel material, placing the wire rod steel material to be processed in the furnace for heating and then holding, and then taking out the furnace for air cooling to complete the annealing of the steel material;

[0030] b) mechanically descaling the wire rod steel material after annealing is completed;

[0031] c) drawing the wire rod steel material after descaling is completed, and cold drawing the wire rod steel material to the required wire diameter through a drawing die;

[0032] d) cold forging the drawn wire rod to form a semi-finished bolt by placing the wire rod into a cold header and forming it through a die;

[0033] e) thread processing the formed bolt to form the required thread of the semi-finished product through a thread rolling die to form a bolt product;

[0034] f) heat treatment of the finished bolt, in turn, heating-quenching-tempering treatment;

[0035] g) surface treatment of the heat-treated bolt, the bolt is placed in the hot zinc solution of 462℃ in the galvanizing equipment for 30s to carry out surface hot galvanizing treatment to obtain the corrosion-resistant fan base bolt.

[0036] Example 2

[0037] a) annealing treatment of the wire rod steel, the wire rod steel to be processed is heated and then cooled in the air to complete the annealing of the steel;

[0038] b) mechanical descaling treatment of the wire rod steel after annealing;

[0039] c) drawing treatment of the wire rod steel after descaling, the wire rod steel is cold-drawn to the required wire diameter through the drawing die;

[0040] d) cold forging forming treatment of the drawn wire, the wire is placed in the cold header to form the semi-finished bolt through the die;

[0041] e) thread processing treatment of the formed bolt, the semi-finished product is formed into the required thread through the thread rolling plate to form the bolt product;

[0042] f) heat treatment of the finished bolt, in turn, heating-quenching-tempering treatment;

[0043] g) surface treatment of the heat-treated bolt, the bolt is placed in the hot zinc solution of 471℃ in the galvanizing equipment for 45s to carry out surface hot galvanizing treatment to obtain the corrosion-resistant fan base bolt.

[0044] Example 3

[0045] a) annealing treatment of the wire rod steel, the wire rod steel to be processed is heated and then cooled in the air to complete the annealing of the steel;

[0046] b) mechanical descaling treatment of the wire rod steel after annealing;

[0047] c) drawing treatment of the wire rod steel after descaling, the wire rod steel is cold-drawn to the required wire diameter through the drawing die;

[0048] d) cold forging forming treatment of the drawn wire, the wire is placed in the cold header to form the semi-finished bolt through the die;

[0049] e) thread processing treatment of the formed bolt, the semi-finished product is formed into the required thread through the thread rolling plate to form the bolt product;

[0050] f) heat treating the finished bolt, sequentially heating-quenching-tempering;

[0051] g) surface treating the heat treated bolt, placing the bolt in a hot zinc bath at 479℃ in a galvanizing device for 60s to obtain the corrosion resistant fan base bolt by hot galvanizing.

[0052] The bolts in the above embodiments 1-3 are tested for performance, the corrosion resistant fan base bolt obtained in the embodiment 1 has a galvanized layer thickness of 64μm; the corrosion resistant fan base bolt obtained in the embodiment 2 has a galvanized layer thickness of 71μm; the corrosion resistant fan base bolt obtained in the embodiment 3 has a galvanized layer thickness of 69μm.

[0053] Referring to Figure 1 , the galvanizing device in the step g includes a furnace shell 1, a lifting mechanism 2, a rotating mechanism 3 and a galvanizing cylinder 4, the lifting mechanism 2 is arranged at the top center of the inner wall of the furnace shell 1, the rotating mechanism 3 is arranged at the inner side of the lifting mechanism 2 and connected to the two ends of the bottom of the lifting mechanism 2, and the galvanizing cylinder 4 is arranged at the inner side of the rotating mechanism 3.

[0054] Referring to Figure 2 , the furnace shell 1 includes a furnace outer shell 11 and a furnace inner wall 12, the middle to bottom and the bottom between the furnace outer shell 11 and the furnace inner wall 12 are provided with a heat insulation layer 13, the heating device 15 is arranged above the center of the bottom of the furnace inner wall 12, the temperature control device 14 is arranged on the outer surface of one side of the furnace outer shell 11, the temperature control device 14 can sense and accurately control the temperature in the furnace to prevent the temperature in the furnace from being too high or too low, and the heat insulation layer 13 can enhance the heat preservation effect of the galvanizing device and prevent the temperature of the furnace outer shell 11 from being too high to scald the workers.

[0055] Referring to Figure 3The lifting mechanism 2 comprises a lifting cylinder 21, a first mounting frame 22, a rotating rod 23, a second mounting frame 24 and a galvanized cylinder 4, the lifting cylinder 21 is provided with a lifting rod 211 in the middle, the first mounting frame 22 and the second mounting frame 24 are both n-shaped, the bottom of the lifting cylinder 21 is provided in a upside-down state and abuts against the top center of the inner wall 12 of the furnace shell 1, the middle of the lifting rod 211 of the lifting cylinder 21 is connected with the center of the second mounting frame 24, the bottom of the lifting rod 211 of the lifting cylinder 21 is connected with the center of the first mounting frame 22, the bottom of the second mounting frame 24 is connected with the top of the first mounting frame 22 at both ends, spring members 25 are sleeved on the two side edges of the second mounting frame 24, the bottom of the first mounting frame 22 is provided with the rotating rod 23, one end of the rotating rod 23 away from the first mounting frame 22 is connected with the center of the side surface of the galvanized cylinder 4, the structure is reasonable and simple, and it is more convenient to lower the galvanized cylinder 4 into the hot zinc liquid to complete the hot galvanizing of the bolt, the spring members 25 arranged on the second mounting frame 24 can buffer the force of the downward movement of the lifting cylinder 21, and prevent the splashing of the hot zinc liquid.

[0056] Referring to Figure 4 , Figure 5 The rotating mechanism 3 comprises rotating motors 31, rotating rods 32, transmission belts 33, baffles 34 and fans 35, the rotating motors 31 are arranged on the inner sides of the two sides of the first mounting frame 22 close to the top, the rotating rods 32 are connected between the rotating motors 31, the rotating rods 32 are provided with the transmission belts 33 close to the two ends, one side of the transmission belt 33 is arranged on the rotating rod 32, and the other side of the transmission belt 33 is arranged on the rotating rod 23, the baffles 34 are arranged below the rotating motors 31, the baffles 34 are located on the inner side of the transmission belt 33, the fans 35 are arranged below the middle of the baffles 34, the rotating motors 31 drive the rotating of the rotating rods 32, the rotating rods 32 drive the rotating of the rotating rod 23 through the transmission belts 33, so that the galvanized cylinder 4 can rotate to shake off the excess zinc liquid on the bolt, the quality of the bolt galvanizing is ensured, the waste of the zinc liquid is avoided, the baffles 34 can prevent the zinc liquid from being splashed to the upper part of the inner wall during the rotating of the galvanized cylinder 4, and the fans 35 can accelerate the cooling of the bolt after the hot galvanizing.

[0057] Referring to Figure 6The galvanized cylinder 4 comprises a cylinder cover 41 and a cylinder body 42, the rectangular tenon 43 is arranged in the middle of the side of the cylinder cover 41 away from the cylinder body 42, the rotatable round rod 44 is arranged on the rectangular tenon 43, the rectangular hollow tenon 45 is arranged in the middle of the side of the cylinder body 42 away from the cylinder cover 41, the length of the rectangular hollow tenon 45 is equal to the length of the round rod 44, and the width of the rectangular hollow tenon 45 is equal to the width of the rectangular tenon 43, so that the galvanized cylinder 4 is more convenient to open and close.

[0058] The production process of the corrosion-resistant fan base bolt of the application adopts hot galvanizing process, which can enhance the corrosion resistance, safety and toughness of the galvanized layer, prolong the service life of the bolt, reduce the maintenance frequency of the fan, and also save time and labor in the operation process while reducing production cost. The galvanizing equipment is also provided with a rotating structure to remove the excess zinc liquid on the bolt, ensuring the quality of the bolt galvanizing. The working environment of the fan is harsh and humid, and the bolt is easily corroded for long-term exposure to air. If the corroded bolt is used for a long time, the stability and safety of the fan will be greatly reduced, and if the corrosion is serious, it may even cause the fan to collapse and cause accidents.

[0059] The above examples are illustrative of the application and are not limiting of the application, and any simple transformation of the application also belongs to the protection scope of the application.

Claims

1. A production process for corrosion-resistant fan base bolts, characterized by: The production process steps of the corrosion-resistant fan base bolts include: a) Annealing the wire rod steel: Place the wire rod steel to be processed into a furnace for heating and then keeping it warm. Then take it out of the furnace and air cool it to complete the annealing of the steel. b) Mechanically descaling the wire rod steel after annealing; c) Drawing the descaled wire rod steel, and cold-drawing the wire rod steel to the required wire diameter through a drawing die; d) The drawn wire is subjected to cold forging processing, and the wire is placed in a cold heading machine and formed into a semi-finished bolt through a die; e) Processing the formed bolts with threads, using a thread rolling plate to form the required threads on the semi-finished products to form finished bolts; f) Heat treatment of the processed bolts, in sequence of heating-quenching-tempering; g) Surface treatment is performed on the heat-treated bolts. The bolts are placed in a hot zinc bath at 455-480°C in a galvanizing equipment and stay for 30-60 seconds to perform surface hot-dip galvanizing treatment to obtain corrosion-resistant fan base bolts. The galvanizing equipment in step g comprises a furnace shell (1), a lifting mechanism (2), a rotating mechanism (3) and a galvanizing cylinder (4), wherein the lifting mechanism (2) is arranged at the center of the top of the inner wall of the furnace shell (1), the two ends of the rotating mechanism (3) are connected to the two ends of the bottom of the lifting mechanism (2) and are arranged on the inner side of the lifting mechanism (2), and the galvanizing cylinder (4) is arranged on the inner side of the rotating mechanism (3), and the furnace shell (1) comprises a furnace shell (11) and a furnace inner wall (12), and a heat insulation layer (13) is provided from the middle to the bottom and the bottom between the furnace shell (11) and the furnace inner wall (12), and the upper center of the bottom of the furnace inner wall (12) is provided. A heating device (15) is provided on one side of the furnace shell (11), a temperature control device (14) is provided on the outer surface of one side of the furnace shell (11), the lifting mechanism (2) comprises a lifting cylinder (21), a first mounting frame (22), a rotating rod (23), a second mounting frame (24) and a galvanized cylinder (4), a lifting rod (211) is provided in the middle of the lifting cylinder (21), the first mounting frame (22) and the second mounting frame (24) are both n-shaped, the bottom of the lifting cylinder (21) is abutted against the center of the top of the furnace inner wall (12) in the furnace shell (1) and is arranged in an inverted state, and the middle of the lifting rod (211) of the lifting cylinder (21) is aligned with the center of the furnace inner wall (12) in the furnace shell (1). The center of the second mounting frame (24) is connected, the bottom of the lifting rod (211) of the lifting cylinder (21) is connected to the center of the first mounting frame (22), the two ends of the bottom of the second mounting frame (24) are connected to the top of the first mounting frame (22), and spring members (25) are sleeved on both sides of the second mounting frame (24). The two ends of the bottom of the first mounting frame (22) are provided with rotating rods (23), and the end of the rotating rod (23) away from the first mounting frame (22) is connected to the center of the side of the galvanized cylinder (4). The rotating mechanism (3) includes a rotating motor (31), a rotating rod (32), a transmission belt (33), a stop The rotary motor (31) is provided on the inner side of both sides of the first mounting frame (22) near the top, and the plurality of rotary motors (31) are connected by a rotating rod (32). The rotating rod (32) is provided with a plurality of transmission belts (33) near both ends, one side of the transmission belt (33) is provided on the rotating rod (32), and the other side of the transmission belt (33) is provided on the rotating rod (23). A baffle (34) is provided below the rotary motor (31), and the baffle (34) is located inside the transmission belt (33). A fan (35) is provided below the middle of the baffle (34).

2. A production process for corrosion-resistant fan base bolts according to claim 1, characterized in that: The temperature of the hot-dip bath in step g is 462° C., and the residence time is 30 seconds.

3. The production process of a corrosion-resistant fan base bolt according to claim 1, characterized in that: The temperature of the hot-dip bath in step g is 471° C., and the residence time is 45 seconds.

4. The production process of a corrosion-resistant fan base bolt according to claim 1, characterized in that: The temperature of the hot-dip bath in step g is 479° C., and the residence time is 60 s.

5. The production process of a corrosion-resistant fan base bolt according to claim 1, characterized in that: The galvanized cylinder (4) comprises a cylinder cover (41) and a cylinder body (42), wherein a rectangular tenon (43) is provided in the middle of one side of the cylinder cover (41) away from the cylinder body (42), and a rotatable round rod (44) is provided on the rectangular tenon (43), and a rectangular hollow tenon (45) is provided in the middle of one side of the cylinder body (42) away from the cylinder cover (41), wherein the length of the rectangular hollow tenon (45) is equal to the length of the round rod (44), and the width of the rectangular hollow tenon (45) is equal to the width of the rectangular tenon (43).

Images